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UBUNTU: Ubuntu-4.15.0-96.97
[mirror_ubuntu-bionic-kernel.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/errqueue.h>
97 #include <linux/types.h>
98 #include <linux/socket.h>
99 #include <linux/in.h>
100 #include <linux/kernel.h>
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/sched/mm.h>
106 #include <linux/timer.h>
107 #include <linux/string.h>
108 #include <linux/sockios.h>
109 #include <linux/net.h>
110 #include <linux/mm.h>
111 #include <linux/slab.h>
112 #include <linux/interrupt.h>
113 #include <linux/poll.h>
114 #include <linux/tcp.h>
115 #include <linux/init.h>
116 #include <linux/highmem.h>
117 #include <linux/user_namespace.h>
118 #include <linux/static_key.h>
119 #include <linux/memcontrol.h>
120 #include <linux/prefetch.h>
121
122 #include <linux/uaccess.h>
123
124 #include <linux/netdevice.h>
125 #include <net/protocol.h>
126 #include <linux/skbuff.h>
127 #include <net/net_namespace.h>
128 #include <net/request_sock.h>
129 #include <net/sock.h>
130 #include <linux/net_tstamp.h>
131 #include <net/xfrm.h>
132 #include <linux/ipsec.h>
133 #include <net/cls_cgroup.h>
134 #include <net/netprio_cgroup.h>
135 #include <linux/sock_diag.h>
136
137 #include <linux/filter.h>
138 #include <net/sock_reuseport.h>
139
140 #include <trace/events/sock.h>
141
142 #include <net/tcp.h>
143 #include <net/busy_poll.h>
144
145 static DEFINE_MUTEX(proto_list_mutex);
146 static LIST_HEAD(proto_list);
147
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 */
158 bool 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 }
164 EXPORT_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 capability 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 */
175 bool sk_capable(const struct sock *sk, int cap)
176 {
177 return sk_ns_capable(sk, &init_user_ns, cap);
178 }
179 EXPORT_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 socket was created
187 * and the current process has the capability @cap over the network namespace
188 * the socket is a member of.
189 */
190 bool sk_net_capable(const struct sock *sk, int cap)
191 {
192 return sk_ns_capable(sk, sock_net(sk)->user_ns, cap);
193 }
194 EXPORT_SYMBOL(sk_net_capable);
195
196 /*
197 * Each address family might have different locking rules, so we have
198 * one slock key per address family and separate keys for internal and
199 * userspace sockets.
200 */
201 static struct lock_class_key af_family_keys[AF_MAX];
202 static struct lock_class_key af_family_kern_keys[AF_MAX];
203 static struct lock_class_key af_family_slock_keys[AF_MAX];
204 static struct lock_class_key af_family_kern_slock_keys[AF_MAX];
205
206 /*
207 * Make lock validator output more readable. (we pre-construct these
208 * strings build-time, so that runtime initialization of socket
209 * locks is fast):
210 */
211
212 #define _sock_locks(x) \
213 x "AF_UNSPEC", x "AF_UNIX" , x "AF_INET" , \
214 x "AF_AX25" , x "AF_IPX" , x "AF_APPLETALK", \
215 x "AF_NETROM", x "AF_BRIDGE" , x "AF_ATMPVC" , \
216 x "AF_X25" , x "AF_INET6" , x "AF_ROSE" , \
217 x "AF_DECnet", x "AF_NETBEUI" , x "AF_SECURITY" , \
218 x "AF_KEY" , x "AF_NETLINK" , x "AF_PACKET" , \
219 x "AF_ASH" , x "AF_ECONET" , x "AF_ATMSVC" , \
220 x "AF_RDS" , x "AF_SNA" , x "AF_IRDA" , \
221 x "AF_PPPOX" , x "AF_WANPIPE" , x "AF_LLC" , \
222 x "27" , x "28" , x "AF_CAN" , \
223 x "AF_TIPC" , x "AF_BLUETOOTH", x "IUCV" , \
224 x "AF_RXRPC" , x "AF_ISDN" , x "AF_PHONET" , \
225 x "AF_IEEE802154", x "AF_CAIF" , x "AF_ALG" , \
226 x "AF_NFC" , x "AF_VSOCK" , x "AF_KCM" , \
227 x "AF_QIPCRTR", x "AF_SMC" , x "AF_MAX"
228
229 static const char *const af_family_key_strings[AF_MAX+1] = {
230 _sock_locks("sk_lock-")
231 };
232 static const char *const af_family_slock_key_strings[AF_MAX+1] = {
233 _sock_locks("slock-")
234 };
235 static const char *const af_family_clock_key_strings[AF_MAX+1] = {
236 _sock_locks("clock-")
237 };
238
239 static const char *const af_family_kern_key_strings[AF_MAX+1] = {
240 _sock_locks("k-sk_lock-")
241 };
242 static const char *const af_family_kern_slock_key_strings[AF_MAX+1] = {
243 _sock_locks("k-slock-")
244 };
245 static const char *const af_family_kern_clock_key_strings[AF_MAX+1] = {
246 _sock_locks("k-clock-")
247 };
248 static const char *const af_family_rlock_key_strings[AF_MAX+1] = {
249 "rlock-AF_UNSPEC", "rlock-AF_UNIX" , "rlock-AF_INET" ,
250 "rlock-AF_AX25" , "rlock-AF_IPX" , "rlock-AF_APPLETALK",
251 "rlock-AF_NETROM", "rlock-AF_BRIDGE" , "rlock-AF_ATMPVC" ,
252 "rlock-AF_X25" , "rlock-AF_INET6" , "rlock-AF_ROSE" ,
253 "rlock-AF_DECnet", "rlock-AF_NETBEUI" , "rlock-AF_SECURITY" ,
254 "rlock-AF_KEY" , "rlock-AF_NETLINK" , "rlock-AF_PACKET" ,
255 "rlock-AF_ASH" , "rlock-AF_ECONET" , "rlock-AF_ATMSVC" ,
256 "rlock-AF_RDS" , "rlock-AF_SNA" , "rlock-AF_IRDA" ,
257 "rlock-AF_PPPOX" , "rlock-AF_WANPIPE" , "rlock-AF_LLC" ,
258 "rlock-27" , "rlock-28" , "rlock-AF_CAN" ,
259 "rlock-AF_TIPC" , "rlock-AF_BLUETOOTH", "rlock-AF_IUCV" ,
260 "rlock-AF_RXRPC" , "rlock-AF_ISDN" , "rlock-AF_PHONET" ,
261 "rlock-AF_IEEE802154", "rlock-AF_CAIF" , "rlock-AF_ALG" ,
262 "rlock-AF_NFC" , "rlock-AF_VSOCK" , "rlock-AF_KCM" ,
263 "rlock-AF_QIPCRTR", "rlock-AF_SMC" , "rlock-AF_MAX"
264 };
265 static const char *const af_family_wlock_key_strings[AF_MAX+1] = {
266 "wlock-AF_UNSPEC", "wlock-AF_UNIX" , "wlock-AF_INET" ,
267 "wlock-AF_AX25" , "wlock-AF_IPX" , "wlock-AF_APPLETALK",
268 "wlock-AF_NETROM", "wlock-AF_BRIDGE" , "wlock-AF_ATMPVC" ,
269 "wlock-AF_X25" , "wlock-AF_INET6" , "wlock-AF_ROSE" ,
270 "wlock-AF_DECnet", "wlock-AF_NETBEUI" , "wlock-AF_SECURITY" ,
271 "wlock-AF_KEY" , "wlock-AF_NETLINK" , "wlock-AF_PACKET" ,
272 "wlock-AF_ASH" , "wlock-AF_ECONET" , "wlock-AF_ATMSVC" ,
273 "wlock-AF_RDS" , "wlock-AF_SNA" , "wlock-AF_IRDA" ,
274 "wlock-AF_PPPOX" , "wlock-AF_WANPIPE" , "wlock-AF_LLC" ,
275 "wlock-27" , "wlock-28" , "wlock-AF_CAN" ,
276 "wlock-AF_TIPC" , "wlock-AF_BLUETOOTH", "wlock-AF_IUCV" ,
277 "wlock-AF_RXRPC" , "wlock-AF_ISDN" , "wlock-AF_PHONET" ,
278 "wlock-AF_IEEE802154", "wlock-AF_CAIF" , "wlock-AF_ALG" ,
279 "wlock-AF_NFC" , "wlock-AF_VSOCK" , "wlock-AF_KCM" ,
280 "wlock-AF_QIPCRTR", "wlock-AF_SMC" , "wlock-AF_MAX"
281 };
282 static const char *const af_family_elock_key_strings[AF_MAX+1] = {
283 "elock-AF_UNSPEC", "elock-AF_UNIX" , "elock-AF_INET" ,
284 "elock-AF_AX25" , "elock-AF_IPX" , "elock-AF_APPLETALK",
285 "elock-AF_NETROM", "elock-AF_BRIDGE" , "elock-AF_ATMPVC" ,
286 "elock-AF_X25" , "elock-AF_INET6" , "elock-AF_ROSE" ,
287 "elock-AF_DECnet", "elock-AF_NETBEUI" , "elock-AF_SECURITY" ,
288 "elock-AF_KEY" , "elock-AF_NETLINK" , "elock-AF_PACKET" ,
289 "elock-AF_ASH" , "elock-AF_ECONET" , "elock-AF_ATMSVC" ,
290 "elock-AF_RDS" , "elock-AF_SNA" , "elock-AF_IRDA" ,
291 "elock-AF_PPPOX" , "elock-AF_WANPIPE" , "elock-AF_LLC" ,
292 "elock-27" , "elock-28" , "elock-AF_CAN" ,
293 "elock-AF_TIPC" , "elock-AF_BLUETOOTH", "elock-AF_IUCV" ,
294 "elock-AF_RXRPC" , "elock-AF_ISDN" , "elock-AF_PHONET" ,
295 "elock-AF_IEEE802154", "elock-AF_CAIF" , "elock-AF_ALG" ,
296 "elock-AF_NFC" , "elock-AF_VSOCK" , "elock-AF_KCM" ,
297 "elock-AF_QIPCRTR", "elock-AF_SMC" , "elock-AF_MAX"
298 };
299
300 /*
301 * sk_callback_lock and sk queues locking rules are per-address-family,
302 * so split the lock classes by using a per-AF key:
303 */
304 static struct lock_class_key af_callback_keys[AF_MAX];
305 static struct lock_class_key af_rlock_keys[AF_MAX];
306 static struct lock_class_key af_wlock_keys[AF_MAX];
307 static struct lock_class_key af_elock_keys[AF_MAX];
308 static struct lock_class_key af_kern_callback_keys[AF_MAX];
309
310 /* Run time adjustable parameters. */
311 __u32 sysctl_wmem_max __read_mostly = SK_WMEM_MAX;
312 EXPORT_SYMBOL(sysctl_wmem_max);
313 __u32 sysctl_rmem_max __read_mostly = SK_RMEM_MAX;
314 EXPORT_SYMBOL(sysctl_rmem_max);
315 __u32 sysctl_wmem_default __read_mostly = SK_WMEM_MAX;
316 __u32 sysctl_rmem_default __read_mostly = SK_RMEM_MAX;
317
318 /* Maximal space eaten by iovec or ancillary data plus some space */
319 int sysctl_optmem_max __read_mostly = sizeof(unsigned long)*(2*UIO_MAXIOV+512);
320 EXPORT_SYMBOL(sysctl_optmem_max);
321
322 int sysctl_tstamp_allow_data __read_mostly = 1;
323
324 struct static_key memalloc_socks = STATIC_KEY_INIT_FALSE;
325 EXPORT_SYMBOL_GPL(memalloc_socks);
326
327 /**
328 * sk_set_memalloc - sets %SOCK_MEMALLOC
329 * @sk: socket to set it on
330 *
331 * Set %SOCK_MEMALLOC on a socket for access to emergency reserves.
332 * It's the responsibility of the admin to adjust min_free_kbytes
333 * to meet the requirements
334 */
335 void sk_set_memalloc(struct sock *sk)
336 {
337 sock_set_flag(sk, SOCK_MEMALLOC);
338 sk->sk_allocation |= __GFP_MEMALLOC;
339 static_key_slow_inc(&memalloc_socks);
340 }
341 EXPORT_SYMBOL_GPL(sk_set_memalloc);
342
343 void sk_clear_memalloc(struct sock *sk)
344 {
345 sock_reset_flag(sk, SOCK_MEMALLOC);
346 sk->sk_allocation &= ~__GFP_MEMALLOC;
347 static_key_slow_dec(&memalloc_socks);
348
349 /*
350 * SOCK_MEMALLOC is allowed to ignore rmem limits to ensure forward
351 * progress of swapping. SOCK_MEMALLOC may be cleared while
352 * it has rmem allocations due to the last swapfile being deactivated
353 * but there is a risk that the socket is unusable due to exceeding
354 * the rmem limits. Reclaim the reserves and obey rmem limits again.
355 */
356 sk_mem_reclaim(sk);
357 }
358 EXPORT_SYMBOL_GPL(sk_clear_memalloc);
359
360 int __sk_backlog_rcv(struct sock *sk, struct sk_buff *skb)
361 {
362 int ret;
363 unsigned int noreclaim_flag;
364
365 /* these should have been dropped before queueing */
366 BUG_ON(!sock_flag(sk, SOCK_MEMALLOC));
367
368 noreclaim_flag = memalloc_noreclaim_save();
369 ret = sk->sk_backlog_rcv(sk, skb);
370 memalloc_noreclaim_restore(noreclaim_flag);
371
372 return ret;
373 }
374 EXPORT_SYMBOL(__sk_backlog_rcv);
375
376 static int sock_set_timeout(long *timeo_p, char __user *optval, int optlen)
377 {
378 struct timeval tv;
379
380 if (optlen < sizeof(tv))
381 return -EINVAL;
382 if (copy_from_user(&tv, optval, sizeof(tv)))
383 return -EFAULT;
384 if (tv.tv_usec < 0 || tv.tv_usec >= USEC_PER_SEC)
385 return -EDOM;
386
387 if (tv.tv_sec < 0) {
388 static int warned __read_mostly;
389
390 *timeo_p = 0;
391 if (warned < 10 && net_ratelimit()) {
392 warned++;
393 pr_info("%s: `%s' (pid %d) tries to set negative timeout\n",
394 __func__, current->comm, task_pid_nr(current));
395 }
396 return 0;
397 }
398 *timeo_p = MAX_SCHEDULE_TIMEOUT;
399 if (tv.tv_sec == 0 && tv.tv_usec == 0)
400 return 0;
401 if (tv.tv_sec < (MAX_SCHEDULE_TIMEOUT/HZ - 1))
402 *timeo_p = tv.tv_sec * HZ + DIV_ROUND_UP(tv.tv_usec, USEC_PER_SEC / HZ);
403 return 0;
404 }
405
406 static void sock_warn_obsolete_bsdism(const char *name)
407 {
408 static int warned;
409 static char warncomm[TASK_COMM_LEN];
410 if (strcmp(warncomm, current->comm) && warned < 5) {
411 strcpy(warncomm, current->comm);
412 pr_warn("process `%s' is using obsolete %s SO_BSDCOMPAT\n",
413 warncomm, name);
414 warned++;
415 }
416 }
417
418 static bool sock_needs_netstamp(const struct sock *sk)
419 {
420 switch (sk->sk_family) {
421 case AF_UNSPEC:
422 case AF_UNIX:
423 return false;
424 default:
425 return true;
426 }
427 }
428
429 static void sock_disable_timestamp(struct sock *sk, unsigned long flags)
430 {
431 if (sk->sk_flags & flags) {
432 sk->sk_flags &= ~flags;
433 if (sock_needs_netstamp(sk) &&
434 !(sk->sk_flags & SK_FLAGS_TIMESTAMP))
435 net_disable_timestamp();
436 }
437 }
438
439
440 int __sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
441 {
442 unsigned long flags;
443 struct sk_buff_head *list = &sk->sk_receive_queue;
444
445 if (atomic_read(&sk->sk_rmem_alloc) >= sk->sk_rcvbuf) {
446 atomic_inc(&sk->sk_drops);
447 trace_sock_rcvqueue_full(sk, skb);
448 return -ENOMEM;
449 }
450
451 if (!sk_rmem_schedule(sk, skb, skb->truesize)) {
452 atomic_inc(&sk->sk_drops);
453 return -ENOBUFS;
454 }
455
456 skb->dev = NULL;
457 skb_set_owner_r(skb, sk);
458
459 /* we escape from rcu protected region, make sure we dont leak
460 * a norefcounted dst
461 */
462 skb_dst_force(skb);
463
464 spin_lock_irqsave(&list->lock, flags);
465 sock_skb_set_dropcount(sk, skb);
466 __skb_queue_tail(list, skb);
467 spin_unlock_irqrestore(&list->lock, flags);
468
469 if (!sock_flag(sk, SOCK_DEAD))
470 sk->sk_data_ready(sk);
471 return 0;
472 }
473 EXPORT_SYMBOL(__sock_queue_rcv_skb);
474
475 int sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
476 {
477 int err;
478
479 err = sk_filter(sk, skb);
480 if (err)
481 return err;
482
483 return __sock_queue_rcv_skb(sk, skb);
484 }
485 EXPORT_SYMBOL(sock_queue_rcv_skb);
486
487 int __sk_receive_skb(struct sock *sk, struct sk_buff *skb,
488 const int nested, unsigned int trim_cap, bool refcounted)
489 {
490 int rc = NET_RX_SUCCESS;
491
492 if (sk_filter_trim_cap(sk, skb, trim_cap))
493 goto discard_and_relse;
494
495 skb->dev = NULL;
496
497 if (sk_rcvqueues_full(sk, sk->sk_rcvbuf)) {
498 atomic_inc(&sk->sk_drops);
499 goto discard_and_relse;
500 }
501 if (nested)
502 bh_lock_sock_nested(sk);
503 else
504 bh_lock_sock(sk);
505 if (!sock_owned_by_user(sk)) {
506 /*
507 * trylock + unlock semantics:
508 */
509 mutex_acquire(&sk->sk_lock.dep_map, 0, 1, _RET_IP_);
510
511 rc = sk_backlog_rcv(sk, skb);
512
513 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_);
514 } else if (sk_add_backlog(sk, skb, sk->sk_rcvbuf)) {
515 bh_unlock_sock(sk);
516 atomic_inc(&sk->sk_drops);
517 goto discard_and_relse;
518 }
519
520 bh_unlock_sock(sk);
521 out:
522 if (refcounted)
523 sock_put(sk);
524 return rc;
525 discard_and_relse:
526 kfree_skb(skb);
527 goto out;
528 }
529 EXPORT_SYMBOL(__sk_receive_skb);
530
531 struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie)
532 {
533 struct dst_entry *dst = __sk_dst_get(sk);
534
535 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
536 sk_tx_queue_clear(sk);
537 sk->sk_dst_pending_confirm = 0;
538 RCU_INIT_POINTER(sk->sk_dst_cache, NULL);
539 dst_release(dst);
540 return NULL;
541 }
542
543 return dst;
544 }
545 EXPORT_SYMBOL(__sk_dst_check);
546
547 struct dst_entry *sk_dst_check(struct sock *sk, u32 cookie)
548 {
549 struct dst_entry *dst = sk_dst_get(sk);
550
551 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
552 sk_dst_reset(sk);
553 dst_release(dst);
554 return NULL;
555 }
556
557 return dst;
558 }
559 EXPORT_SYMBOL(sk_dst_check);
560
561 static int sock_setbindtodevice(struct sock *sk, char __user *optval,
562 int optlen)
563 {
564 int ret = -ENOPROTOOPT;
565 #ifdef CONFIG_NETDEVICES
566 struct net *net = sock_net(sk);
567 char devname[IFNAMSIZ];
568 int index;
569
570 /* Sorry... */
571 ret = -EPERM;
572 if (!ns_capable(net->user_ns, CAP_NET_RAW))
573 goto out;
574
575 ret = -EINVAL;
576 if (optlen < 0)
577 goto out;
578
579 /* Bind this socket to a particular device like "eth0",
580 * as specified in the passed interface name. If the
581 * name is "" or the option length is zero the socket
582 * is not bound.
583 */
584 if (optlen > IFNAMSIZ - 1)
585 optlen = IFNAMSIZ - 1;
586 memset(devname, 0, sizeof(devname));
587
588 ret = -EFAULT;
589 if (copy_from_user(devname, optval, optlen))
590 goto out;
591
592 index = 0;
593 if (devname[0] != '\0') {
594 struct net_device *dev;
595
596 rcu_read_lock();
597 dev = dev_get_by_name_rcu(net, devname);
598 if (dev)
599 index = dev->ifindex;
600 rcu_read_unlock();
601 ret = -ENODEV;
602 if (!dev)
603 goto out;
604 }
605
606 lock_sock(sk);
607 sk->sk_bound_dev_if = index;
608 sk_dst_reset(sk);
609 release_sock(sk);
610
611 ret = 0;
612
613 out:
614 #endif
615
616 return ret;
617 }
618
619 static int sock_getbindtodevice(struct sock *sk, char __user *optval,
620 int __user *optlen, int len)
621 {
622 int ret = -ENOPROTOOPT;
623 #ifdef CONFIG_NETDEVICES
624 struct net *net = sock_net(sk);
625 char devname[IFNAMSIZ];
626
627 if (sk->sk_bound_dev_if == 0) {
628 len = 0;
629 goto zero;
630 }
631
632 ret = -EINVAL;
633 if (len < IFNAMSIZ)
634 goto out;
635
636 ret = netdev_get_name(net, devname, sk->sk_bound_dev_if);
637 if (ret)
638 goto out;
639
640 len = strlen(devname) + 1;
641
642 ret = -EFAULT;
643 if (copy_to_user(optval, devname, len))
644 goto out;
645
646 zero:
647 ret = -EFAULT;
648 if (put_user(len, optlen))
649 goto out;
650
651 ret = 0;
652
653 out:
654 #endif
655
656 return ret;
657 }
658
659 static inline void sock_valbool_flag(struct sock *sk, int bit, int valbool)
660 {
661 if (valbool)
662 sock_set_flag(sk, bit);
663 else
664 sock_reset_flag(sk, bit);
665 }
666
667 bool sk_mc_loop(struct sock *sk)
668 {
669 if (dev_recursion_level())
670 return false;
671 if (!sk)
672 return true;
673 switch (sk->sk_family) {
674 case AF_INET:
675 return inet_sk(sk)->mc_loop;
676 #if IS_ENABLED(CONFIG_IPV6)
677 case AF_INET6:
678 return inet6_sk(sk)->mc_loop;
679 #endif
680 }
681 WARN_ON(1);
682 return true;
683 }
684 EXPORT_SYMBOL(sk_mc_loop);
685
686 /*
687 * This is meant for all protocols to use and covers goings on
688 * at the socket level. Everything here is generic.
689 */
690
691 int sock_setsockopt(struct socket *sock, int level, int optname,
692 char __user *optval, unsigned int optlen)
693 {
694 struct sock *sk = sock->sk;
695 int val;
696 int valbool;
697 struct linger ling;
698 int ret = 0;
699
700 /*
701 * Options without arguments
702 */
703
704 if (optname == SO_BINDTODEVICE)
705 return sock_setbindtodevice(sk, optval, optlen);
706
707 if (optlen < sizeof(int))
708 return -EINVAL;
709
710 if (get_user(val, (int __user *)optval))
711 return -EFAULT;
712
713 valbool = val ? 1 : 0;
714
715 lock_sock(sk);
716
717 switch (optname) {
718 case SO_DEBUG:
719 if (val && !capable(CAP_NET_ADMIN))
720 ret = -EACCES;
721 else
722 sock_valbool_flag(sk, SOCK_DBG, valbool);
723 break;
724 case SO_REUSEADDR:
725 sk->sk_reuse = (valbool ? SK_CAN_REUSE : SK_NO_REUSE);
726 break;
727 case SO_REUSEPORT:
728 sk->sk_reuseport = valbool;
729 break;
730 case SO_TYPE:
731 case SO_PROTOCOL:
732 case SO_DOMAIN:
733 case SO_ERROR:
734 ret = -ENOPROTOOPT;
735 break;
736 case SO_DONTROUTE:
737 sock_valbool_flag(sk, SOCK_LOCALROUTE, valbool);
738 sk_dst_reset(sk);
739 break;
740 case SO_BROADCAST:
741 sock_valbool_flag(sk, SOCK_BROADCAST, valbool);
742 break;
743 case SO_SNDBUF:
744 /* Don't error on this BSD doesn't and if you think
745 * about it this is right. Otherwise apps have to
746 * play 'guess the biggest size' games. RCVBUF/SNDBUF
747 * are treated in BSD as hints
748 */
749 val = min_t(u32, val, sysctl_wmem_max);
750 set_sndbuf:
751 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
752 sk->sk_sndbuf = max_t(int, val * 2, SOCK_MIN_SNDBUF);
753 /* Wake up sending tasks if we upped the value. */
754 sk->sk_write_space(sk);
755 break;
756
757 case SO_SNDBUFFORCE:
758 if (!capable(CAP_NET_ADMIN)) {
759 ret = -EPERM;
760 break;
761 }
762 goto set_sndbuf;
763
764 case SO_RCVBUF:
765 /* Don't error on this BSD doesn't and if you think
766 * about it this is right. Otherwise apps have to
767 * play 'guess the biggest size' games. RCVBUF/SNDBUF
768 * are treated in BSD as hints
769 */
770 val = min_t(u32, val, sysctl_rmem_max);
771 set_rcvbuf:
772 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
773 /*
774 * We double it on the way in to account for
775 * "struct sk_buff" etc. overhead. Applications
776 * assume that the SO_RCVBUF setting they make will
777 * allow that much actual data to be received on that
778 * socket.
779 *
780 * Applications are unaware that "struct sk_buff" and
781 * other overheads allocate from the receive buffer
782 * during socket buffer allocation.
783 *
784 * And after considering the possible alternatives,
785 * returning the value we actually used in getsockopt
786 * is the most desirable behavior.
787 */
788 sk->sk_rcvbuf = max_t(int, val * 2, SOCK_MIN_RCVBUF);
789 break;
790
791 case SO_RCVBUFFORCE:
792 if (!capable(CAP_NET_ADMIN)) {
793 ret = -EPERM;
794 break;
795 }
796 goto set_rcvbuf;
797
798 case SO_KEEPALIVE:
799 if (sk->sk_prot->keepalive)
800 sk->sk_prot->keepalive(sk, valbool);
801 sock_valbool_flag(sk, SOCK_KEEPOPEN, valbool);
802 break;
803
804 case SO_OOBINLINE:
805 sock_valbool_flag(sk, SOCK_URGINLINE, valbool);
806 break;
807
808 case SO_NO_CHECK:
809 sk->sk_no_check_tx = valbool;
810 break;
811
812 case SO_PRIORITY:
813 if ((val >= 0 && val <= 6) ||
814 ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
815 sk->sk_priority = val;
816 else
817 ret = -EPERM;
818 break;
819
820 case SO_LINGER:
821 if (optlen < sizeof(ling)) {
822 ret = -EINVAL; /* 1003.1g */
823 break;
824 }
825 if (copy_from_user(&ling, optval, sizeof(ling))) {
826 ret = -EFAULT;
827 break;
828 }
829 if (!ling.l_onoff)
830 sock_reset_flag(sk, SOCK_LINGER);
831 else {
832 #if (BITS_PER_LONG == 32)
833 if ((unsigned int)ling.l_linger >= MAX_SCHEDULE_TIMEOUT/HZ)
834 sk->sk_lingertime = MAX_SCHEDULE_TIMEOUT;
835 else
836 #endif
837 sk->sk_lingertime = (unsigned int)ling.l_linger * HZ;
838 sock_set_flag(sk, SOCK_LINGER);
839 }
840 break;
841
842 case SO_BSDCOMPAT:
843 sock_warn_obsolete_bsdism("setsockopt");
844 break;
845
846 case SO_PASSCRED:
847 if (valbool)
848 set_bit(SOCK_PASSCRED, &sock->flags);
849 else
850 clear_bit(SOCK_PASSCRED, &sock->flags);
851 break;
852
853 case SO_TIMESTAMP:
854 case SO_TIMESTAMPNS:
855 if (valbool) {
856 if (optname == SO_TIMESTAMP)
857 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
858 else
859 sock_set_flag(sk, SOCK_RCVTSTAMPNS);
860 sock_set_flag(sk, SOCK_RCVTSTAMP);
861 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
862 } else {
863 sock_reset_flag(sk, SOCK_RCVTSTAMP);
864 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
865 }
866 break;
867
868 case SO_TIMESTAMPING:
869 if (val & ~SOF_TIMESTAMPING_MASK) {
870 ret = -EINVAL;
871 break;
872 }
873
874 if (val & SOF_TIMESTAMPING_OPT_ID &&
875 !(sk->sk_tsflags & SOF_TIMESTAMPING_OPT_ID)) {
876 if (sk->sk_protocol == IPPROTO_TCP &&
877 sk->sk_type == SOCK_STREAM) {
878 if ((1 << sk->sk_state) &
879 (TCPF_CLOSE | TCPF_LISTEN)) {
880 ret = -EINVAL;
881 break;
882 }
883 sk->sk_tskey = tcp_sk(sk)->snd_una;
884 } else {
885 sk->sk_tskey = 0;
886 }
887 }
888
889 if (val & SOF_TIMESTAMPING_OPT_STATS &&
890 !(val & SOF_TIMESTAMPING_OPT_TSONLY)) {
891 ret = -EINVAL;
892 break;
893 }
894
895 sk->sk_tsflags = val;
896 if (val & SOF_TIMESTAMPING_RX_SOFTWARE)
897 sock_enable_timestamp(sk,
898 SOCK_TIMESTAMPING_RX_SOFTWARE);
899 else
900 sock_disable_timestamp(sk,
901 (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE));
902 break;
903
904 case SO_RCVLOWAT:
905 if (val < 0)
906 val = INT_MAX;
907 sk->sk_rcvlowat = val ? : 1;
908 break;
909
910 case SO_RCVTIMEO:
911 ret = sock_set_timeout(&sk->sk_rcvtimeo, optval, optlen);
912 break;
913
914 case SO_SNDTIMEO:
915 ret = sock_set_timeout(&sk->sk_sndtimeo, optval, optlen);
916 break;
917
918 case SO_ATTACH_FILTER:
919 ret = -EINVAL;
920 if (optlen == sizeof(struct sock_fprog)) {
921 struct sock_fprog fprog;
922
923 ret = -EFAULT;
924 if (copy_from_user(&fprog, optval, sizeof(fprog)))
925 break;
926
927 ret = sk_attach_filter(&fprog, sk);
928 }
929 break;
930
931 case SO_ATTACH_BPF:
932 ret = -EINVAL;
933 if (optlen == sizeof(u32)) {
934 u32 ufd;
935
936 ret = -EFAULT;
937 if (copy_from_user(&ufd, optval, sizeof(ufd)))
938 break;
939
940 ret = sk_attach_bpf(ufd, sk);
941 }
942 break;
943
944 case SO_ATTACH_REUSEPORT_CBPF:
945 ret = -EINVAL;
946 if (optlen == sizeof(struct sock_fprog)) {
947 struct sock_fprog fprog;
948
949 ret = -EFAULT;
950 if (copy_from_user(&fprog, optval, sizeof(fprog)))
951 break;
952
953 ret = sk_reuseport_attach_filter(&fprog, sk);
954 }
955 break;
956
957 case SO_ATTACH_REUSEPORT_EBPF:
958 ret = -EINVAL;
959 if (optlen == sizeof(u32)) {
960 u32 ufd;
961
962 ret = -EFAULT;
963 if (copy_from_user(&ufd, optval, sizeof(ufd)))
964 break;
965
966 ret = sk_reuseport_attach_bpf(ufd, sk);
967 }
968 break;
969
970 case SO_DETACH_FILTER:
971 ret = sk_detach_filter(sk);
972 break;
973
974 case SO_LOCK_FILTER:
975 if (sock_flag(sk, SOCK_FILTER_LOCKED) && !valbool)
976 ret = -EPERM;
977 else
978 sock_valbool_flag(sk, SOCK_FILTER_LOCKED, valbool);
979 break;
980
981 case SO_PASSSEC:
982 if (valbool)
983 set_bit(SOCK_PASSSEC, &sock->flags);
984 else
985 clear_bit(SOCK_PASSSEC, &sock->flags);
986 break;
987 case SO_MARK:
988 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
989 ret = -EPERM;
990 else
991 sk->sk_mark = val;
992 break;
993
994 case SO_RXQ_OVFL:
995 sock_valbool_flag(sk, SOCK_RXQ_OVFL, valbool);
996 break;
997
998 case SO_WIFI_STATUS:
999 sock_valbool_flag(sk, SOCK_WIFI_STATUS, valbool);
1000 break;
1001
1002 case SO_PEEK_OFF:
1003 if (sock->ops->set_peek_off)
1004 ret = sock->ops->set_peek_off(sk, val);
1005 else
1006 ret = -EOPNOTSUPP;
1007 break;
1008
1009 case SO_NOFCS:
1010 sock_valbool_flag(sk, SOCK_NOFCS, valbool);
1011 break;
1012
1013 case SO_SELECT_ERR_QUEUE:
1014 sock_valbool_flag(sk, SOCK_SELECT_ERR_QUEUE, valbool);
1015 break;
1016
1017 #ifdef CONFIG_NET_RX_BUSY_POLL
1018 case SO_BUSY_POLL:
1019 /* allow unprivileged users to decrease the value */
1020 if ((val > sk->sk_ll_usec) && !capable(CAP_NET_ADMIN))
1021 ret = -EPERM;
1022 else {
1023 if (val < 0)
1024 ret = -EINVAL;
1025 else
1026 sk->sk_ll_usec = val;
1027 }
1028 break;
1029 #endif
1030
1031 case SO_MAX_PACING_RATE:
1032 if (val != ~0U)
1033 cmpxchg(&sk->sk_pacing_status,
1034 SK_PACING_NONE,
1035 SK_PACING_NEEDED);
1036 sk->sk_max_pacing_rate = val;
1037 sk->sk_pacing_rate = min(sk->sk_pacing_rate,
1038 sk->sk_max_pacing_rate);
1039 break;
1040
1041 case SO_INCOMING_CPU:
1042 WRITE_ONCE(sk->sk_incoming_cpu, val);
1043 break;
1044
1045 case SO_CNX_ADVICE:
1046 if (val == 1)
1047 dst_negative_advice(sk);
1048 break;
1049
1050 case SO_ZEROCOPY:
1051 if (sk->sk_family != PF_INET && sk->sk_family != PF_INET6)
1052 ret = -ENOTSUPP;
1053 else if (sk->sk_protocol != IPPROTO_TCP)
1054 ret = -ENOTSUPP;
1055 else if (sk->sk_state != TCP_CLOSE)
1056 ret = -EBUSY;
1057 else if (val < 0 || val > 1)
1058 ret = -EINVAL;
1059 else
1060 sock_valbool_flag(sk, SOCK_ZEROCOPY, valbool);
1061 break;
1062
1063 default:
1064 ret = -ENOPROTOOPT;
1065 break;
1066 }
1067 release_sock(sk);
1068 return ret;
1069 }
1070 EXPORT_SYMBOL(sock_setsockopt);
1071
1072
1073 static void cred_to_ucred(struct pid *pid, const struct cred *cred,
1074 struct ucred *ucred)
1075 {
1076 ucred->pid = pid_vnr(pid);
1077 ucred->uid = ucred->gid = -1;
1078 if (cred) {
1079 struct user_namespace *current_ns = current_user_ns();
1080
1081 ucred->uid = from_kuid_munged(current_ns, cred->euid);
1082 ucred->gid = from_kgid_munged(current_ns, cred->egid);
1083 }
1084 }
1085
1086 static int groups_to_user(gid_t __user *dst, const struct group_info *src)
1087 {
1088 struct user_namespace *user_ns = current_user_ns();
1089 int i;
1090
1091 for (i = 0; i < src->ngroups; i++)
1092 if (put_user(from_kgid_munged(user_ns, src->gid[i]), dst + i))
1093 return -EFAULT;
1094
1095 return 0;
1096 }
1097
1098 int sock_getsockopt(struct socket *sock, int level, int optname,
1099 char __user *optval, int __user *optlen)
1100 {
1101 struct sock *sk = sock->sk;
1102
1103 union {
1104 int val;
1105 u64 val64;
1106 struct linger ling;
1107 struct timeval tm;
1108 } v;
1109
1110 int lv = sizeof(int);
1111 int len;
1112
1113 if (get_user(len, optlen))
1114 return -EFAULT;
1115 if (len < 0)
1116 return -EINVAL;
1117
1118 memset(&v, 0, sizeof(v));
1119
1120 switch (optname) {
1121 case SO_DEBUG:
1122 v.val = sock_flag(sk, SOCK_DBG);
1123 break;
1124
1125 case SO_DONTROUTE:
1126 v.val = sock_flag(sk, SOCK_LOCALROUTE);
1127 break;
1128
1129 case SO_BROADCAST:
1130 v.val = sock_flag(sk, SOCK_BROADCAST);
1131 break;
1132
1133 case SO_SNDBUF:
1134 v.val = sk->sk_sndbuf;
1135 break;
1136
1137 case SO_RCVBUF:
1138 v.val = sk->sk_rcvbuf;
1139 break;
1140
1141 case SO_REUSEADDR:
1142 v.val = sk->sk_reuse;
1143 break;
1144
1145 case SO_REUSEPORT:
1146 v.val = sk->sk_reuseport;
1147 break;
1148
1149 case SO_KEEPALIVE:
1150 v.val = sock_flag(sk, SOCK_KEEPOPEN);
1151 break;
1152
1153 case SO_TYPE:
1154 v.val = sk->sk_type;
1155 break;
1156
1157 case SO_PROTOCOL:
1158 v.val = sk->sk_protocol;
1159 break;
1160
1161 case SO_DOMAIN:
1162 v.val = sk->sk_family;
1163 break;
1164
1165 case SO_ERROR:
1166 v.val = -sock_error(sk);
1167 if (v.val == 0)
1168 v.val = xchg(&sk->sk_err_soft, 0);
1169 break;
1170
1171 case SO_OOBINLINE:
1172 v.val = sock_flag(sk, SOCK_URGINLINE);
1173 break;
1174
1175 case SO_NO_CHECK:
1176 v.val = sk->sk_no_check_tx;
1177 break;
1178
1179 case SO_PRIORITY:
1180 v.val = sk->sk_priority;
1181 break;
1182
1183 case SO_LINGER:
1184 lv = sizeof(v.ling);
1185 v.ling.l_onoff = sock_flag(sk, SOCK_LINGER);
1186 v.ling.l_linger = sk->sk_lingertime / HZ;
1187 break;
1188
1189 case SO_BSDCOMPAT:
1190 sock_warn_obsolete_bsdism("getsockopt");
1191 break;
1192
1193 case SO_TIMESTAMP:
1194 v.val = sock_flag(sk, SOCK_RCVTSTAMP) &&
1195 !sock_flag(sk, SOCK_RCVTSTAMPNS);
1196 break;
1197
1198 case SO_TIMESTAMPNS:
1199 v.val = sock_flag(sk, SOCK_RCVTSTAMPNS);
1200 break;
1201
1202 case SO_TIMESTAMPING:
1203 v.val = sk->sk_tsflags;
1204 break;
1205
1206 case SO_RCVTIMEO:
1207 lv = sizeof(struct timeval);
1208 if (sk->sk_rcvtimeo == MAX_SCHEDULE_TIMEOUT) {
1209 v.tm.tv_sec = 0;
1210 v.tm.tv_usec = 0;
1211 } else {
1212 v.tm.tv_sec = sk->sk_rcvtimeo / HZ;
1213 v.tm.tv_usec = ((sk->sk_rcvtimeo % HZ) * USEC_PER_SEC) / HZ;
1214 }
1215 break;
1216
1217 case SO_SNDTIMEO:
1218 lv = sizeof(struct timeval);
1219 if (sk->sk_sndtimeo == MAX_SCHEDULE_TIMEOUT) {
1220 v.tm.tv_sec = 0;
1221 v.tm.tv_usec = 0;
1222 } else {
1223 v.tm.tv_sec = sk->sk_sndtimeo / HZ;
1224 v.tm.tv_usec = ((sk->sk_sndtimeo % HZ) * USEC_PER_SEC) / HZ;
1225 }
1226 break;
1227
1228 case SO_RCVLOWAT:
1229 v.val = sk->sk_rcvlowat;
1230 break;
1231
1232 case SO_SNDLOWAT:
1233 v.val = 1;
1234 break;
1235
1236 case SO_PASSCRED:
1237 v.val = !!test_bit(SOCK_PASSCRED, &sock->flags);
1238 break;
1239
1240 case SO_PEERCRED:
1241 {
1242 struct ucred peercred;
1243 if (len > sizeof(peercred))
1244 len = sizeof(peercred);
1245 cred_to_ucred(sk->sk_peer_pid, sk->sk_peer_cred, &peercred);
1246 if (copy_to_user(optval, &peercred, len))
1247 return -EFAULT;
1248 goto lenout;
1249 }
1250
1251 case SO_PEERGROUPS:
1252 {
1253 int ret, n;
1254
1255 if (!sk->sk_peer_cred)
1256 return -ENODATA;
1257
1258 n = sk->sk_peer_cred->group_info->ngroups;
1259 if (len < n * sizeof(gid_t)) {
1260 len = n * sizeof(gid_t);
1261 return put_user(len, optlen) ? -EFAULT : -ERANGE;
1262 }
1263 len = n * sizeof(gid_t);
1264
1265 ret = groups_to_user((gid_t __user *)optval,
1266 sk->sk_peer_cred->group_info);
1267 if (ret)
1268 return ret;
1269 goto lenout;
1270 }
1271
1272 case SO_PEERNAME:
1273 {
1274 char address[128];
1275
1276 if (sock->ops->getname(sock, (struct sockaddr *)address, &lv, 2))
1277 return -ENOTCONN;
1278 if (lv < len)
1279 return -EINVAL;
1280 if (copy_to_user(optval, address, len))
1281 return -EFAULT;
1282 goto lenout;
1283 }
1284
1285 /* Dubious BSD thing... Probably nobody even uses it, but
1286 * the UNIX standard wants it for whatever reason... -DaveM
1287 */
1288 case SO_ACCEPTCONN:
1289 v.val = sk->sk_state == TCP_LISTEN;
1290 break;
1291
1292 case SO_PASSSEC:
1293 v.val = !!test_bit(SOCK_PASSSEC, &sock->flags);
1294 break;
1295
1296 case SO_PEERSEC:
1297 return security_socket_getpeersec_stream(sock, optval, optlen, len);
1298
1299 case SO_MARK:
1300 v.val = sk->sk_mark;
1301 break;
1302
1303 case SO_RXQ_OVFL:
1304 v.val = sock_flag(sk, SOCK_RXQ_OVFL);
1305 break;
1306
1307 case SO_WIFI_STATUS:
1308 v.val = sock_flag(sk, SOCK_WIFI_STATUS);
1309 break;
1310
1311 case SO_PEEK_OFF:
1312 if (!sock->ops->set_peek_off)
1313 return -EOPNOTSUPP;
1314
1315 v.val = sk->sk_peek_off;
1316 break;
1317 case SO_NOFCS:
1318 v.val = sock_flag(sk, SOCK_NOFCS);
1319 break;
1320
1321 case SO_BINDTODEVICE:
1322 return sock_getbindtodevice(sk, optval, optlen, len);
1323
1324 case SO_GET_FILTER:
1325 len = sk_get_filter(sk, (struct sock_filter __user *)optval, len);
1326 if (len < 0)
1327 return len;
1328
1329 goto lenout;
1330
1331 case SO_LOCK_FILTER:
1332 v.val = sock_flag(sk, SOCK_FILTER_LOCKED);
1333 break;
1334
1335 case SO_BPF_EXTENSIONS:
1336 v.val = bpf_tell_extensions();
1337 break;
1338
1339 case SO_SELECT_ERR_QUEUE:
1340 v.val = sock_flag(sk, SOCK_SELECT_ERR_QUEUE);
1341 break;
1342
1343 #ifdef CONFIG_NET_RX_BUSY_POLL
1344 case SO_BUSY_POLL:
1345 v.val = sk->sk_ll_usec;
1346 break;
1347 #endif
1348
1349 case SO_MAX_PACING_RATE:
1350 v.val = sk->sk_max_pacing_rate;
1351 break;
1352
1353 case SO_INCOMING_CPU:
1354 v.val = READ_ONCE(sk->sk_incoming_cpu);
1355 break;
1356
1357 case SO_MEMINFO:
1358 {
1359 u32 meminfo[SK_MEMINFO_VARS];
1360
1361 sk_get_meminfo(sk, meminfo);
1362
1363 len = min_t(unsigned int, len, sizeof(meminfo));
1364 if (copy_to_user(optval, &meminfo, len))
1365 return -EFAULT;
1366
1367 goto lenout;
1368 }
1369
1370 #ifdef CONFIG_NET_RX_BUSY_POLL
1371 case SO_INCOMING_NAPI_ID:
1372 v.val = READ_ONCE(sk->sk_napi_id);
1373
1374 /* aggregate non-NAPI IDs down to 0 */
1375 if (v.val < MIN_NAPI_ID)
1376 v.val = 0;
1377
1378 break;
1379 #endif
1380
1381 case SO_COOKIE:
1382 lv = sizeof(u64);
1383 if (len < lv)
1384 return -EINVAL;
1385 v.val64 = sock_gen_cookie(sk);
1386 break;
1387
1388 case SO_ZEROCOPY:
1389 v.val = sock_flag(sk, SOCK_ZEROCOPY);
1390 break;
1391
1392 default:
1393 /* We implement the SO_SNDLOWAT etc to not be settable
1394 * (1003.1g 7).
1395 */
1396 return -ENOPROTOOPT;
1397 }
1398
1399 if (len > lv)
1400 len = lv;
1401 if (copy_to_user(optval, &v, len))
1402 return -EFAULT;
1403 lenout:
1404 if (put_user(len, optlen))
1405 return -EFAULT;
1406 return 0;
1407 }
1408
1409 /*
1410 * Initialize an sk_lock.
1411 *
1412 * (We also register the sk_lock with the lock validator.)
1413 */
1414 static inline void sock_lock_init(struct sock *sk)
1415 {
1416 if (sk->sk_kern_sock)
1417 sock_lock_init_class_and_name(
1418 sk,
1419 af_family_kern_slock_key_strings[sk->sk_family],
1420 af_family_kern_slock_keys + sk->sk_family,
1421 af_family_kern_key_strings[sk->sk_family],
1422 af_family_kern_keys + sk->sk_family);
1423 else
1424 sock_lock_init_class_and_name(
1425 sk,
1426 af_family_slock_key_strings[sk->sk_family],
1427 af_family_slock_keys + sk->sk_family,
1428 af_family_key_strings[sk->sk_family],
1429 af_family_keys + sk->sk_family);
1430 }
1431
1432 /*
1433 * Copy all fields from osk to nsk but nsk->sk_refcnt must not change yet,
1434 * even temporarly, because of RCU lookups. sk_node should also be left as is.
1435 * We must not copy fields between sk_dontcopy_begin and sk_dontcopy_end
1436 */
1437 static void sock_copy(struct sock *nsk, const struct sock *osk)
1438 {
1439 #ifdef CONFIG_SECURITY_NETWORK
1440 void *sptr = nsk->sk_security;
1441 #endif
1442 memcpy(nsk, osk, offsetof(struct sock, sk_dontcopy_begin));
1443
1444 memcpy(&nsk->sk_dontcopy_end, &osk->sk_dontcopy_end,
1445 osk->sk_prot->obj_size - offsetof(struct sock, sk_dontcopy_end));
1446
1447 #ifdef CONFIG_SECURITY_NETWORK
1448 nsk->sk_security = sptr;
1449 security_sk_clone(osk, nsk);
1450 #endif
1451 }
1452
1453 static struct sock *sk_prot_alloc(struct proto *prot, gfp_t priority,
1454 int family)
1455 {
1456 struct sock *sk;
1457 struct kmem_cache *slab;
1458
1459 slab = prot->slab;
1460 if (slab != NULL) {
1461 sk = kmem_cache_alloc(slab, priority & ~__GFP_ZERO);
1462 if (!sk)
1463 return sk;
1464 if (priority & __GFP_ZERO)
1465 sk_prot_clear_nulls(sk, prot->obj_size);
1466 } else
1467 sk = kmalloc(prot->obj_size, priority);
1468
1469 if (sk != NULL) {
1470 if (security_sk_alloc(sk, family, priority))
1471 goto out_free;
1472
1473 if (!try_module_get(prot->owner))
1474 goto out_free_sec;
1475 sk_tx_queue_clear(sk);
1476 }
1477
1478 return sk;
1479
1480 out_free_sec:
1481 security_sk_free(sk);
1482 out_free:
1483 if (slab != NULL)
1484 kmem_cache_free(slab, sk);
1485 else
1486 kfree(sk);
1487 return NULL;
1488 }
1489
1490 static void sk_prot_free(struct proto *prot, struct sock *sk)
1491 {
1492 struct kmem_cache *slab;
1493 struct module *owner;
1494
1495 owner = prot->owner;
1496 slab = prot->slab;
1497
1498 cgroup_sk_free(&sk->sk_cgrp_data);
1499 mem_cgroup_sk_free(sk);
1500 security_sk_free(sk);
1501 if (slab != NULL)
1502 kmem_cache_free(slab, sk);
1503 else
1504 kfree(sk);
1505 module_put(owner);
1506 }
1507
1508 /**
1509 * sk_alloc - All socket objects are allocated here
1510 * @net: the applicable net namespace
1511 * @family: protocol family
1512 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
1513 * @prot: struct proto associated with this new sock instance
1514 * @kern: is this to be a kernel socket?
1515 */
1516 struct sock *sk_alloc(struct net *net, int family, gfp_t priority,
1517 struct proto *prot, int kern)
1518 {
1519 struct sock *sk;
1520
1521 sk = sk_prot_alloc(prot, priority | __GFP_ZERO, family);
1522 if (sk) {
1523 sk->sk_family = family;
1524 /*
1525 * See comment in struct sock definition to understand
1526 * why we need sk_prot_creator -acme
1527 */
1528 sk->sk_prot = sk->sk_prot_creator = prot;
1529 sk->sk_kern_sock = kern;
1530 sock_lock_init(sk);
1531 sk->sk_net_refcnt = kern ? 0 : 1;
1532 if (likely(sk->sk_net_refcnt))
1533 get_net(net);
1534 sock_net_set(sk, net);
1535 refcount_set(&sk->sk_wmem_alloc, 1);
1536
1537 mem_cgroup_sk_alloc(sk);
1538 cgroup_sk_alloc(&sk->sk_cgrp_data);
1539 sock_update_classid(&sk->sk_cgrp_data);
1540 sock_update_netprioidx(&sk->sk_cgrp_data);
1541 }
1542
1543 return sk;
1544 }
1545 EXPORT_SYMBOL(sk_alloc);
1546
1547 /* Sockets having SOCK_RCU_FREE will call this function after one RCU
1548 * grace period. This is the case for UDP sockets and TCP listeners.
1549 */
1550 static void __sk_destruct(struct rcu_head *head)
1551 {
1552 struct sock *sk = container_of(head, struct sock, sk_rcu);
1553 struct sk_filter *filter;
1554
1555 if (sk->sk_destruct)
1556 sk->sk_destruct(sk);
1557
1558 filter = rcu_dereference_check(sk->sk_filter,
1559 refcount_read(&sk->sk_wmem_alloc) == 0);
1560 if (filter) {
1561 sk_filter_uncharge(sk, filter);
1562 RCU_INIT_POINTER(sk->sk_filter, NULL);
1563 }
1564
1565 sock_disable_timestamp(sk, SK_FLAGS_TIMESTAMP);
1566
1567 if (atomic_read(&sk->sk_omem_alloc))
1568 pr_debug("%s: optmem leakage (%d bytes) detected\n",
1569 __func__, atomic_read(&sk->sk_omem_alloc));
1570
1571 if (sk->sk_frag.page) {
1572 put_page(sk->sk_frag.page);
1573 sk->sk_frag.page = NULL;
1574 }
1575
1576 if (sk->sk_peer_cred)
1577 put_cred(sk->sk_peer_cred);
1578 put_pid(sk->sk_peer_pid);
1579 if (likely(sk->sk_net_refcnt))
1580 put_net(sock_net(sk));
1581 sk_prot_free(sk->sk_prot_creator, sk);
1582 }
1583
1584 void sk_destruct(struct sock *sk)
1585 {
1586 bool use_call_rcu = sock_flag(sk, SOCK_RCU_FREE);
1587
1588 if (rcu_access_pointer(sk->sk_reuseport_cb)) {
1589 reuseport_detach_sock(sk);
1590 use_call_rcu = true;
1591 }
1592
1593 if (use_call_rcu)
1594 call_rcu(&sk->sk_rcu, __sk_destruct);
1595 else
1596 __sk_destruct(&sk->sk_rcu);
1597 }
1598
1599 static void __sk_free(struct sock *sk)
1600 {
1601 if (unlikely(sk->sk_net_refcnt && sock_diag_has_destroy_listeners(sk)))
1602 sock_diag_broadcast_destroy(sk);
1603 else
1604 sk_destruct(sk);
1605 }
1606
1607 void sk_free(struct sock *sk)
1608 {
1609 /*
1610 * We subtract one from sk_wmem_alloc and can know if
1611 * some packets are still in some tx queue.
1612 * If not null, sock_wfree() will call __sk_free(sk) later
1613 */
1614 if (refcount_dec_and_test(&sk->sk_wmem_alloc))
1615 __sk_free(sk);
1616 }
1617 EXPORT_SYMBOL(sk_free);
1618
1619 static void sk_init_common(struct sock *sk)
1620 {
1621 skb_queue_head_init(&sk->sk_receive_queue);
1622 skb_queue_head_init(&sk->sk_write_queue);
1623 skb_queue_head_init(&sk->sk_error_queue);
1624
1625 rwlock_init(&sk->sk_callback_lock);
1626 lockdep_set_class_and_name(&sk->sk_receive_queue.lock,
1627 af_rlock_keys + sk->sk_family,
1628 af_family_rlock_key_strings[sk->sk_family]);
1629 lockdep_set_class_and_name(&sk->sk_write_queue.lock,
1630 af_wlock_keys + sk->sk_family,
1631 af_family_wlock_key_strings[sk->sk_family]);
1632 lockdep_set_class_and_name(&sk->sk_error_queue.lock,
1633 af_elock_keys + sk->sk_family,
1634 af_family_elock_key_strings[sk->sk_family]);
1635 lockdep_set_class_and_name(&sk->sk_callback_lock,
1636 af_callback_keys + sk->sk_family,
1637 af_family_clock_key_strings[sk->sk_family]);
1638 }
1639
1640 /**
1641 * sk_clone_lock - clone a socket, and lock its clone
1642 * @sk: the socket to clone
1643 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
1644 *
1645 * Caller must unlock socket even in error path (bh_unlock_sock(newsk))
1646 */
1647 struct sock *sk_clone_lock(const struct sock *sk, const gfp_t priority)
1648 {
1649 struct sock *newsk;
1650 bool is_charged = true;
1651
1652 newsk = sk_prot_alloc(sk->sk_prot, priority, sk->sk_family);
1653 if (newsk != NULL) {
1654 struct sk_filter *filter;
1655
1656 sock_copy(newsk, sk);
1657
1658 newsk->sk_prot_creator = sk->sk_prot;
1659
1660 /* SANITY */
1661 if (likely(newsk->sk_net_refcnt))
1662 get_net(sock_net(newsk));
1663 sk_node_init(&newsk->sk_node);
1664 sock_lock_init(newsk);
1665 bh_lock_sock(newsk);
1666 newsk->sk_backlog.head = newsk->sk_backlog.tail = NULL;
1667 newsk->sk_backlog.len = 0;
1668
1669 atomic_set(&newsk->sk_rmem_alloc, 0);
1670 /*
1671 * sk_wmem_alloc set to one (see sk_free() and sock_wfree())
1672 */
1673 refcount_set(&newsk->sk_wmem_alloc, 1);
1674 atomic_set(&newsk->sk_omem_alloc, 0);
1675 sk_init_common(newsk);
1676
1677 newsk->sk_dst_cache = NULL;
1678 newsk->sk_dst_pending_confirm = 0;
1679 newsk->sk_wmem_queued = 0;
1680 newsk->sk_forward_alloc = 0;
1681 atomic_set(&newsk->sk_drops, 0);
1682 newsk->sk_send_head = NULL;
1683 newsk->sk_userlocks = sk->sk_userlocks & ~SOCK_BINDPORT_LOCK;
1684 atomic_set(&newsk->sk_zckey, 0);
1685
1686 sock_reset_flag(newsk, SOCK_DONE);
1687 mem_cgroup_sk_alloc(newsk);
1688 cgroup_sk_alloc(&newsk->sk_cgrp_data);
1689
1690 rcu_read_lock();
1691 filter = rcu_dereference(sk->sk_filter);
1692 if (filter != NULL)
1693 /* though it's an empty new sock, the charging may fail
1694 * if sysctl_optmem_max was changed between creation of
1695 * original socket and cloning
1696 */
1697 is_charged = sk_filter_charge(newsk, filter);
1698 RCU_INIT_POINTER(newsk->sk_filter, filter);
1699 rcu_read_unlock();
1700
1701 if (unlikely(!is_charged || xfrm_sk_clone_policy(newsk, sk))) {
1702 /* We need to make sure that we don't uncharge the new
1703 * socket if we couldn't charge it in the first place
1704 * as otherwise we uncharge the parent's filter.
1705 */
1706 if (!is_charged)
1707 RCU_INIT_POINTER(newsk->sk_filter, NULL);
1708 sk_free_unlock_clone(newsk);
1709 newsk = NULL;
1710 goto out;
1711 }
1712 RCU_INIT_POINTER(newsk->sk_reuseport_cb, NULL);
1713
1714 newsk->sk_err = 0;
1715 newsk->sk_err_soft = 0;
1716 newsk->sk_priority = 0;
1717 newsk->sk_incoming_cpu = raw_smp_processor_id();
1718 atomic64_set(&newsk->sk_cookie, 0);
1719
1720 /*
1721 * Before updating sk_refcnt, we must commit prior changes to memory
1722 * (Documentation/RCU/rculist_nulls.txt for details)
1723 */
1724 smp_wmb();
1725 refcount_set(&newsk->sk_refcnt, 2);
1726
1727 /*
1728 * Increment the counter in the same struct proto as the master
1729 * sock (sk_refcnt_debug_inc uses newsk->sk_prot->socks, that
1730 * is the same as sk->sk_prot->socks, as this field was copied
1731 * with memcpy).
1732 *
1733 * This _changes_ the previous behaviour, where
1734 * tcp_create_openreq_child always was incrementing the
1735 * equivalent to tcp_prot->socks (inet_sock_nr), so this have
1736 * to be taken into account in all callers. -acme
1737 */
1738 sk_refcnt_debug_inc(newsk);
1739 sk_set_socket(newsk, NULL);
1740 newsk->sk_wq = NULL;
1741
1742 if (newsk->sk_prot->sockets_allocated)
1743 sk_sockets_allocated_inc(newsk);
1744
1745 if (sock_needs_netstamp(sk) &&
1746 newsk->sk_flags & SK_FLAGS_TIMESTAMP)
1747 net_enable_timestamp();
1748 }
1749 out:
1750 return newsk;
1751 }
1752 EXPORT_SYMBOL_GPL(sk_clone_lock);
1753
1754 void sk_free_unlock_clone(struct sock *sk)
1755 {
1756 /* It is still raw copy of parent, so invalidate
1757 * destructor and make plain sk_free() */
1758 sk->sk_destruct = NULL;
1759 bh_unlock_sock(sk);
1760 sk_free(sk);
1761 }
1762 EXPORT_SYMBOL_GPL(sk_free_unlock_clone);
1763
1764 void sk_setup_caps(struct sock *sk, struct dst_entry *dst)
1765 {
1766 u32 max_segs = 1;
1767
1768 sk_dst_set(sk, dst);
1769 sk->sk_route_caps = dst->dev->features;
1770 if (sk->sk_route_caps & NETIF_F_GSO)
1771 sk->sk_route_caps |= NETIF_F_GSO_SOFTWARE;
1772 sk->sk_route_caps &= ~sk->sk_route_nocaps;
1773 if (sk_can_gso(sk)) {
1774 if (dst->header_len && !xfrm_dst_offload_ok(dst)) {
1775 sk->sk_route_caps &= ~NETIF_F_GSO_MASK;
1776 } else {
1777 sk->sk_route_caps |= NETIF_F_SG | NETIF_F_HW_CSUM;
1778 sk->sk_gso_max_size = dst->dev->gso_max_size;
1779 max_segs = max_t(u32, dst->dev->gso_max_segs, 1);
1780 }
1781 }
1782 sk->sk_gso_max_segs = max_segs;
1783 }
1784 EXPORT_SYMBOL_GPL(sk_setup_caps);
1785
1786 /*
1787 * Simple resource managers for sockets.
1788 */
1789
1790
1791 /*
1792 * Write buffer destructor automatically called from kfree_skb.
1793 */
1794 void sock_wfree(struct sk_buff *skb)
1795 {
1796 struct sock *sk = skb->sk;
1797 unsigned int len = skb->truesize;
1798
1799 if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE)) {
1800 /*
1801 * Keep a reference on sk_wmem_alloc, this will be released
1802 * after sk_write_space() call
1803 */
1804 WARN_ON(refcount_sub_and_test(len - 1, &sk->sk_wmem_alloc));
1805 sk->sk_write_space(sk);
1806 len = 1;
1807 }
1808 /*
1809 * if sk_wmem_alloc reaches 0, we must finish what sk_free()
1810 * could not do because of in-flight packets
1811 */
1812 if (refcount_sub_and_test(len, &sk->sk_wmem_alloc))
1813 __sk_free(sk);
1814 }
1815 EXPORT_SYMBOL(sock_wfree);
1816
1817 /* This variant of sock_wfree() is used by TCP,
1818 * since it sets SOCK_USE_WRITE_QUEUE.
1819 */
1820 void __sock_wfree(struct sk_buff *skb)
1821 {
1822 struct sock *sk = skb->sk;
1823
1824 if (refcount_sub_and_test(skb->truesize, &sk->sk_wmem_alloc))
1825 __sk_free(sk);
1826 }
1827
1828 void skb_set_owner_w(struct sk_buff *skb, struct sock *sk)
1829 {
1830 skb_orphan(skb);
1831 skb->sk = sk;
1832 #ifdef CONFIG_INET
1833 if (unlikely(!sk_fullsock(sk))) {
1834 skb->destructor = sock_edemux;
1835 sock_hold(sk);
1836 return;
1837 }
1838 #endif
1839 skb->destructor = sock_wfree;
1840 skb_set_hash_from_sk(skb, sk);
1841 /*
1842 * We used to take a refcount on sk, but following operation
1843 * is enough to guarantee sk_free() wont free this sock until
1844 * all in-flight packets are completed
1845 */
1846 refcount_add(skb->truesize, &sk->sk_wmem_alloc);
1847 }
1848 EXPORT_SYMBOL(skb_set_owner_w);
1849
1850 /* This helper is used by netem, as it can hold packets in its
1851 * delay queue. We want to allow the owner socket to send more
1852 * packets, as if they were already TX completed by a typical driver.
1853 * But we also want to keep skb->sk set because some packet schedulers
1854 * rely on it (sch_fq for example).
1855 */
1856 void skb_orphan_partial(struct sk_buff *skb)
1857 {
1858 if (skb_is_tcp_pure_ack(skb))
1859 return;
1860
1861 if (skb->destructor == sock_wfree
1862 #ifdef CONFIG_INET
1863 || skb->destructor == tcp_wfree
1864 #endif
1865 ) {
1866 struct sock *sk = skb->sk;
1867
1868 if (refcount_inc_not_zero(&sk->sk_refcnt)) {
1869 WARN_ON(refcount_sub_and_test(skb->truesize, &sk->sk_wmem_alloc));
1870 skb->destructor = sock_efree;
1871 }
1872 } else {
1873 skb_orphan(skb);
1874 }
1875 }
1876 EXPORT_SYMBOL(skb_orphan_partial);
1877
1878 /*
1879 * Read buffer destructor automatically called from kfree_skb.
1880 */
1881 void sock_rfree(struct sk_buff *skb)
1882 {
1883 struct sock *sk = skb->sk;
1884 unsigned int len = skb->truesize;
1885
1886 atomic_sub(len, &sk->sk_rmem_alloc);
1887 sk_mem_uncharge(sk, len);
1888 }
1889 EXPORT_SYMBOL(sock_rfree);
1890
1891 /*
1892 * Buffer destructor for skbs that are not used directly in read or write
1893 * path, e.g. for error handler skbs. Automatically called from kfree_skb.
1894 */
1895 void sock_efree(struct sk_buff *skb)
1896 {
1897 sock_put(skb->sk);
1898 }
1899 EXPORT_SYMBOL(sock_efree);
1900
1901 kuid_t sock_i_uid(struct sock *sk)
1902 {
1903 kuid_t uid;
1904
1905 read_lock_bh(&sk->sk_callback_lock);
1906 uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : GLOBAL_ROOT_UID;
1907 read_unlock_bh(&sk->sk_callback_lock);
1908 return uid;
1909 }
1910 EXPORT_SYMBOL(sock_i_uid);
1911
1912 unsigned long sock_i_ino(struct sock *sk)
1913 {
1914 unsigned long ino;
1915
1916 read_lock_bh(&sk->sk_callback_lock);
1917 ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0;
1918 read_unlock_bh(&sk->sk_callback_lock);
1919 return ino;
1920 }
1921 EXPORT_SYMBOL(sock_i_ino);
1922
1923 /*
1924 * Allocate a skb from the socket's send buffer.
1925 */
1926 struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force,
1927 gfp_t priority)
1928 {
1929 if (force || refcount_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
1930 struct sk_buff *skb = alloc_skb(size, priority);
1931 if (skb) {
1932 skb_set_owner_w(skb, sk);
1933 return skb;
1934 }
1935 }
1936 return NULL;
1937 }
1938 EXPORT_SYMBOL(sock_wmalloc);
1939
1940 static void sock_ofree(struct sk_buff *skb)
1941 {
1942 struct sock *sk = skb->sk;
1943
1944 atomic_sub(skb->truesize, &sk->sk_omem_alloc);
1945 }
1946
1947 struct sk_buff *sock_omalloc(struct sock *sk, unsigned long size,
1948 gfp_t priority)
1949 {
1950 struct sk_buff *skb;
1951
1952 /* small safe race: SKB_TRUESIZE may differ from final skb->truesize */
1953 if (atomic_read(&sk->sk_omem_alloc) + SKB_TRUESIZE(size) >
1954 sysctl_optmem_max)
1955 return NULL;
1956
1957 skb = alloc_skb(size, priority);
1958 if (!skb)
1959 return NULL;
1960
1961 atomic_add(skb->truesize, &sk->sk_omem_alloc);
1962 skb->sk = sk;
1963 skb->destructor = sock_ofree;
1964 return skb;
1965 }
1966
1967 /*
1968 * Allocate a memory block from the socket's option memory buffer.
1969 */
1970 void *sock_kmalloc(struct sock *sk, int size, gfp_t priority)
1971 {
1972 if ((unsigned int)size <= sysctl_optmem_max &&
1973 atomic_read(&sk->sk_omem_alloc) + size < sysctl_optmem_max) {
1974 void *mem;
1975 /* First do the add, to avoid the race if kmalloc
1976 * might sleep.
1977 */
1978 atomic_add(size, &sk->sk_omem_alloc);
1979 mem = kmalloc(size, priority);
1980 if (mem)
1981 return mem;
1982 atomic_sub(size, &sk->sk_omem_alloc);
1983 }
1984 return NULL;
1985 }
1986 EXPORT_SYMBOL(sock_kmalloc);
1987
1988 /* Free an option memory block. Note, we actually want the inline
1989 * here as this allows gcc to detect the nullify and fold away the
1990 * condition entirely.
1991 */
1992 static inline void __sock_kfree_s(struct sock *sk, void *mem, int size,
1993 const bool nullify)
1994 {
1995 if (WARN_ON_ONCE(!mem))
1996 return;
1997 if (nullify)
1998 kzfree(mem);
1999 else
2000 kfree(mem);
2001 atomic_sub(size, &sk->sk_omem_alloc);
2002 }
2003
2004 void sock_kfree_s(struct sock *sk, void *mem, int size)
2005 {
2006 __sock_kfree_s(sk, mem, size, false);
2007 }
2008 EXPORT_SYMBOL(sock_kfree_s);
2009
2010 void sock_kzfree_s(struct sock *sk, void *mem, int size)
2011 {
2012 __sock_kfree_s(sk, mem, size, true);
2013 }
2014 EXPORT_SYMBOL(sock_kzfree_s);
2015
2016 /* It is almost wait_for_tcp_memory minus release_sock/lock_sock.
2017 I think, these locks should be removed for datagram sockets.
2018 */
2019 static long sock_wait_for_wmem(struct sock *sk, long timeo)
2020 {
2021 DEFINE_WAIT(wait);
2022
2023 sk_clear_bit(SOCKWQ_ASYNC_NOSPACE, sk);
2024 for (;;) {
2025 if (!timeo)
2026 break;
2027 if (signal_pending(current))
2028 break;
2029 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
2030 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
2031 if (refcount_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf)
2032 break;
2033 if (sk->sk_shutdown & SEND_SHUTDOWN)
2034 break;
2035 if (sk->sk_err)
2036 break;
2037 timeo = schedule_timeout(timeo);
2038 }
2039 finish_wait(sk_sleep(sk), &wait);
2040 return timeo;
2041 }
2042
2043
2044 /*
2045 * Generic send/receive buffer handlers
2046 */
2047
2048 struct sk_buff *sock_alloc_send_pskb(struct sock *sk, unsigned long header_len,
2049 unsigned long data_len, int noblock,
2050 int *errcode, int max_page_order)
2051 {
2052 struct sk_buff *skb;
2053 long timeo;
2054 int err;
2055
2056 timeo = sock_sndtimeo(sk, noblock);
2057 for (;;) {
2058 err = sock_error(sk);
2059 if (err != 0)
2060 goto failure;
2061
2062 err = -EPIPE;
2063 if (sk->sk_shutdown & SEND_SHUTDOWN)
2064 goto failure;
2065
2066 if (sk_wmem_alloc_get(sk) < sk->sk_sndbuf)
2067 break;
2068
2069 sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk);
2070 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
2071 err = -EAGAIN;
2072 if (!timeo)
2073 goto failure;
2074 if (signal_pending(current))
2075 goto interrupted;
2076 timeo = sock_wait_for_wmem(sk, timeo);
2077 }
2078 skb = alloc_skb_with_frags(header_len, data_len, max_page_order,
2079 errcode, sk->sk_allocation);
2080 if (skb)
2081 skb_set_owner_w(skb, sk);
2082 return skb;
2083
2084 interrupted:
2085 err = sock_intr_errno(timeo);
2086 failure:
2087 *errcode = err;
2088 return NULL;
2089 }
2090 EXPORT_SYMBOL(sock_alloc_send_pskb);
2091
2092 struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size,
2093 int noblock, int *errcode)
2094 {
2095 return sock_alloc_send_pskb(sk, size, 0, noblock, errcode, 0);
2096 }
2097 EXPORT_SYMBOL(sock_alloc_send_skb);
2098
2099 int __sock_cmsg_send(struct sock *sk, struct msghdr *msg, struct cmsghdr *cmsg,
2100 struct sockcm_cookie *sockc)
2101 {
2102 u32 tsflags;
2103
2104 switch (cmsg->cmsg_type) {
2105 case SO_MARK:
2106 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
2107 return -EPERM;
2108 if (cmsg->cmsg_len != CMSG_LEN(sizeof(u32)))
2109 return -EINVAL;
2110 sockc->mark = *(u32 *)CMSG_DATA(cmsg);
2111 break;
2112 case SO_TIMESTAMPING:
2113 if (cmsg->cmsg_len != CMSG_LEN(sizeof(u32)))
2114 return -EINVAL;
2115
2116 tsflags = *(u32 *)CMSG_DATA(cmsg);
2117 if (tsflags & ~SOF_TIMESTAMPING_TX_RECORD_MASK)
2118 return -EINVAL;
2119
2120 sockc->tsflags &= ~SOF_TIMESTAMPING_TX_RECORD_MASK;
2121 sockc->tsflags |= tsflags;
2122 break;
2123 /* SCM_RIGHTS and SCM_CREDENTIALS are semantically in SOL_UNIX. */
2124 case SCM_RIGHTS:
2125 case SCM_CREDENTIALS:
2126 break;
2127 default:
2128 return -EINVAL;
2129 }
2130 return 0;
2131 }
2132 EXPORT_SYMBOL(__sock_cmsg_send);
2133
2134 int sock_cmsg_send(struct sock *sk, struct msghdr *msg,
2135 struct sockcm_cookie *sockc)
2136 {
2137 struct cmsghdr *cmsg;
2138 int ret;
2139
2140 for_each_cmsghdr(cmsg, msg) {
2141 if (!CMSG_OK(msg, cmsg))
2142 return -EINVAL;
2143 if (cmsg->cmsg_level != SOL_SOCKET)
2144 continue;
2145 ret = __sock_cmsg_send(sk, msg, cmsg, sockc);
2146 if (ret)
2147 return ret;
2148 }
2149 return 0;
2150 }
2151 EXPORT_SYMBOL(sock_cmsg_send);
2152
2153 static void sk_enter_memory_pressure(struct sock *sk)
2154 {
2155 if (!sk->sk_prot->enter_memory_pressure)
2156 return;
2157
2158 sk->sk_prot->enter_memory_pressure(sk);
2159 }
2160
2161 static void sk_leave_memory_pressure(struct sock *sk)
2162 {
2163 if (sk->sk_prot->leave_memory_pressure) {
2164 sk->sk_prot->leave_memory_pressure(sk);
2165 } else {
2166 unsigned long *memory_pressure = sk->sk_prot->memory_pressure;
2167
2168 if (memory_pressure && READ_ONCE(*memory_pressure))
2169 WRITE_ONCE(*memory_pressure, 0);
2170 }
2171 }
2172
2173 /* On 32bit arches, an skb frag is limited to 2^15 */
2174 #define SKB_FRAG_PAGE_ORDER get_order(32768)
2175
2176 /**
2177 * skb_page_frag_refill - check that a page_frag contains enough room
2178 * @sz: minimum size of the fragment we want to get
2179 * @pfrag: pointer to page_frag
2180 * @gfp: priority for memory allocation
2181 *
2182 * Note: While this allocator tries to use high order pages, there is
2183 * no guarantee that allocations succeed. Therefore, @sz MUST be
2184 * less or equal than PAGE_SIZE.
2185 */
2186 bool skb_page_frag_refill(unsigned int sz, struct page_frag *pfrag, gfp_t gfp)
2187 {
2188 if (pfrag->page) {
2189 if (page_ref_count(pfrag->page) == 1) {
2190 pfrag->offset = 0;
2191 return true;
2192 }
2193 if (pfrag->offset + sz <= pfrag->size)
2194 return true;
2195 put_page(pfrag->page);
2196 }
2197
2198 pfrag->offset = 0;
2199 if (SKB_FRAG_PAGE_ORDER) {
2200 /* Avoid direct reclaim but allow kswapd to wake */
2201 pfrag->page = alloc_pages((gfp & ~__GFP_DIRECT_RECLAIM) |
2202 __GFP_COMP | __GFP_NOWARN |
2203 __GFP_NORETRY,
2204 SKB_FRAG_PAGE_ORDER);
2205 if (likely(pfrag->page)) {
2206 pfrag->size = PAGE_SIZE << SKB_FRAG_PAGE_ORDER;
2207 return true;
2208 }
2209 }
2210 pfrag->page = alloc_page(gfp);
2211 if (likely(pfrag->page)) {
2212 pfrag->size = PAGE_SIZE;
2213 return true;
2214 }
2215 return false;
2216 }
2217 EXPORT_SYMBOL(skb_page_frag_refill);
2218
2219 bool sk_page_frag_refill(struct sock *sk, struct page_frag *pfrag)
2220 {
2221 if (likely(skb_page_frag_refill(32U, pfrag, sk->sk_allocation)))
2222 return true;
2223
2224 sk_enter_memory_pressure(sk);
2225 sk_stream_moderate_sndbuf(sk);
2226 return false;
2227 }
2228 EXPORT_SYMBOL(sk_page_frag_refill);
2229
2230 static void __lock_sock(struct sock *sk)
2231 __releases(&sk->sk_lock.slock)
2232 __acquires(&sk->sk_lock.slock)
2233 {
2234 DEFINE_WAIT(wait);
2235
2236 for (;;) {
2237 prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait,
2238 TASK_UNINTERRUPTIBLE);
2239 spin_unlock_bh(&sk->sk_lock.slock);
2240 schedule();
2241 spin_lock_bh(&sk->sk_lock.slock);
2242 if (!sock_owned_by_user(sk))
2243 break;
2244 }
2245 finish_wait(&sk->sk_lock.wq, &wait);
2246 }
2247
2248 void __release_sock(struct sock *sk)
2249 __releases(&sk->sk_lock.slock)
2250 __acquires(&sk->sk_lock.slock)
2251 {
2252 struct sk_buff *skb, *next;
2253
2254 while ((skb = sk->sk_backlog.head) != NULL) {
2255 sk->sk_backlog.head = sk->sk_backlog.tail = NULL;
2256
2257 spin_unlock_bh(&sk->sk_lock.slock);
2258
2259 do {
2260 next = skb->next;
2261 prefetch(next);
2262 WARN_ON_ONCE(skb_dst_is_noref(skb));
2263 skb->next = NULL;
2264 sk_backlog_rcv(sk, skb);
2265
2266 cond_resched();
2267
2268 skb = next;
2269 } while (skb != NULL);
2270
2271 spin_lock_bh(&sk->sk_lock.slock);
2272 }
2273
2274 /*
2275 * Doing the zeroing here guarantee we can not loop forever
2276 * while a wild producer attempts to flood us.
2277 */
2278 sk->sk_backlog.len = 0;
2279 }
2280
2281 void __sk_flush_backlog(struct sock *sk)
2282 {
2283 spin_lock_bh(&sk->sk_lock.slock);
2284 __release_sock(sk);
2285 spin_unlock_bh(&sk->sk_lock.slock);
2286 }
2287
2288 /**
2289 * sk_wait_data - wait for data to arrive at sk_receive_queue
2290 * @sk: sock to wait on
2291 * @timeo: for how long
2292 * @skb: last skb seen on sk_receive_queue
2293 *
2294 * Now socket state including sk->sk_err is changed only under lock,
2295 * hence we may omit checks after joining wait queue.
2296 * We check receive queue before schedule() only as optimization;
2297 * it is very likely that release_sock() added new data.
2298 */
2299 int sk_wait_data(struct sock *sk, long *timeo, const struct sk_buff *skb)
2300 {
2301 DEFINE_WAIT_FUNC(wait, woken_wake_function);
2302 int rc;
2303
2304 add_wait_queue(sk_sleep(sk), &wait);
2305 sk_set_bit(SOCKWQ_ASYNC_WAITDATA, sk);
2306 rc = sk_wait_event(sk, timeo, skb_peek_tail(&sk->sk_receive_queue) != skb, &wait);
2307 sk_clear_bit(SOCKWQ_ASYNC_WAITDATA, sk);
2308 remove_wait_queue(sk_sleep(sk), &wait);
2309 return rc;
2310 }
2311 EXPORT_SYMBOL(sk_wait_data);
2312
2313 /**
2314 * __sk_mem_raise_allocated - increase memory_allocated
2315 * @sk: socket
2316 * @size: memory size to allocate
2317 * @amt: pages to allocate
2318 * @kind: allocation type
2319 *
2320 * Similar to __sk_mem_schedule(), but does not update sk_forward_alloc
2321 */
2322 int __sk_mem_raise_allocated(struct sock *sk, int size, int amt, int kind)
2323 {
2324 struct proto *prot = sk->sk_prot;
2325 long allocated = sk_memory_allocated_add(sk, amt);
2326
2327 if (mem_cgroup_sockets_enabled && sk->sk_memcg &&
2328 !mem_cgroup_charge_skmem(sk->sk_memcg, amt))
2329 goto suppress_allocation;
2330
2331 /* Under limit. */
2332 if (allocated <= sk_prot_mem_limits(sk, 0)) {
2333 sk_leave_memory_pressure(sk);
2334 return 1;
2335 }
2336
2337 /* Under pressure. */
2338 if (allocated > sk_prot_mem_limits(sk, 1))
2339 sk_enter_memory_pressure(sk);
2340
2341 /* Over hard limit. */
2342 if (allocated > sk_prot_mem_limits(sk, 2))
2343 goto suppress_allocation;
2344
2345 /* guarantee minimum buffer size under pressure */
2346 if (kind == SK_MEM_RECV) {
2347 if (atomic_read(&sk->sk_rmem_alloc) < sk_get_rmem0(sk, prot))
2348 return 1;
2349
2350 } else { /* SK_MEM_SEND */
2351 int wmem0 = sk_get_wmem0(sk, prot);
2352
2353 if (sk->sk_type == SOCK_STREAM) {
2354 if (sk->sk_wmem_queued < wmem0)
2355 return 1;
2356 } else if (refcount_read(&sk->sk_wmem_alloc) < wmem0) {
2357 return 1;
2358 }
2359 }
2360
2361 if (sk_has_memory_pressure(sk)) {
2362 u64 alloc;
2363
2364 if (!sk_under_memory_pressure(sk))
2365 return 1;
2366 alloc = sk_sockets_allocated_read_positive(sk);
2367 if (sk_prot_mem_limits(sk, 2) > alloc *
2368 sk_mem_pages(sk->sk_wmem_queued +
2369 atomic_read(&sk->sk_rmem_alloc) +
2370 sk->sk_forward_alloc))
2371 return 1;
2372 }
2373
2374 suppress_allocation:
2375
2376 if (kind == SK_MEM_SEND && sk->sk_type == SOCK_STREAM) {
2377 sk_stream_moderate_sndbuf(sk);
2378
2379 /* Fail only if socket is _under_ its sndbuf.
2380 * In this case we cannot block, so that we have to fail.
2381 */
2382 if (sk->sk_wmem_queued + size >= sk->sk_sndbuf)
2383 return 1;
2384 }
2385
2386 trace_sock_exceed_buf_limit(sk, prot, allocated);
2387
2388 sk_memory_allocated_sub(sk, amt);
2389
2390 if (mem_cgroup_sockets_enabled && sk->sk_memcg)
2391 mem_cgroup_uncharge_skmem(sk->sk_memcg, amt);
2392
2393 return 0;
2394 }
2395 EXPORT_SYMBOL(__sk_mem_raise_allocated);
2396
2397 /**
2398 * __sk_mem_schedule - increase sk_forward_alloc and memory_allocated
2399 * @sk: socket
2400 * @size: memory size to allocate
2401 * @kind: allocation type
2402 *
2403 * If kind is SK_MEM_SEND, it means wmem allocation. Otherwise it means
2404 * rmem allocation. This function assumes that protocols which have
2405 * memory_pressure use sk_wmem_queued as write buffer accounting.
2406 */
2407 int __sk_mem_schedule(struct sock *sk, int size, int kind)
2408 {
2409 int ret, amt = sk_mem_pages(size);
2410
2411 sk->sk_forward_alloc += amt << SK_MEM_QUANTUM_SHIFT;
2412 ret = __sk_mem_raise_allocated(sk, size, amt, kind);
2413 if (!ret)
2414 sk->sk_forward_alloc -= amt << SK_MEM_QUANTUM_SHIFT;
2415 return ret;
2416 }
2417 EXPORT_SYMBOL(__sk_mem_schedule);
2418
2419 /**
2420 * __sk_mem_reduce_allocated - reclaim memory_allocated
2421 * @sk: socket
2422 * @amount: number of quanta
2423 *
2424 * Similar to __sk_mem_reclaim(), but does not update sk_forward_alloc
2425 */
2426 void __sk_mem_reduce_allocated(struct sock *sk, int amount)
2427 {
2428 sk_memory_allocated_sub(sk, amount);
2429
2430 if (mem_cgroup_sockets_enabled && sk->sk_memcg)
2431 mem_cgroup_uncharge_skmem(sk->sk_memcg, amount);
2432
2433 if (sk_under_memory_pressure(sk) &&
2434 (sk_memory_allocated(sk) < sk_prot_mem_limits(sk, 0)))
2435 sk_leave_memory_pressure(sk);
2436 }
2437 EXPORT_SYMBOL(__sk_mem_reduce_allocated);
2438
2439 /**
2440 * __sk_mem_reclaim - reclaim sk_forward_alloc and memory_allocated
2441 * @sk: socket
2442 * @amount: number of bytes (rounded down to a SK_MEM_QUANTUM multiple)
2443 */
2444 void __sk_mem_reclaim(struct sock *sk, int amount)
2445 {
2446 amount >>= SK_MEM_QUANTUM_SHIFT;
2447 sk->sk_forward_alloc -= amount << SK_MEM_QUANTUM_SHIFT;
2448 __sk_mem_reduce_allocated(sk, amount);
2449 }
2450 EXPORT_SYMBOL(__sk_mem_reclaim);
2451
2452 int sk_set_peek_off(struct sock *sk, int val)
2453 {
2454 sk->sk_peek_off = val;
2455 return 0;
2456 }
2457 EXPORT_SYMBOL_GPL(sk_set_peek_off);
2458
2459 /*
2460 * Set of default routines for initialising struct proto_ops when
2461 * the protocol does not support a particular function. In certain
2462 * cases where it makes no sense for a protocol to have a "do nothing"
2463 * function, some default processing is provided.
2464 */
2465
2466 int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len)
2467 {
2468 return -EOPNOTSUPP;
2469 }
2470 EXPORT_SYMBOL(sock_no_bind);
2471
2472 int sock_no_connect(struct socket *sock, struct sockaddr *saddr,
2473 int len, int flags)
2474 {
2475 return -EOPNOTSUPP;
2476 }
2477 EXPORT_SYMBOL(sock_no_connect);
2478
2479 int sock_no_socketpair(struct socket *sock1, struct socket *sock2)
2480 {
2481 return -EOPNOTSUPP;
2482 }
2483 EXPORT_SYMBOL(sock_no_socketpair);
2484
2485 int sock_no_accept(struct socket *sock, struct socket *newsock, int flags,
2486 bool kern)
2487 {
2488 return -EOPNOTSUPP;
2489 }
2490 EXPORT_SYMBOL(sock_no_accept);
2491
2492 int sock_no_getname(struct socket *sock, struct sockaddr *saddr,
2493 int *len, int peer)
2494 {
2495 return -EOPNOTSUPP;
2496 }
2497 EXPORT_SYMBOL(sock_no_getname);
2498
2499 unsigned int sock_no_poll(struct file *file, struct socket *sock, poll_table *pt)
2500 {
2501 return 0;
2502 }
2503 EXPORT_SYMBOL(sock_no_poll);
2504
2505 int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
2506 {
2507 return -EOPNOTSUPP;
2508 }
2509 EXPORT_SYMBOL(sock_no_ioctl);
2510
2511 int sock_no_listen(struct socket *sock, int backlog)
2512 {
2513 return -EOPNOTSUPP;
2514 }
2515 EXPORT_SYMBOL(sock_no_listen);
2516
2517 int sock_no_shutdown(struct socket *sock, int how)
2518 {
2519 return -EOPNOTSUPP;
2520 }
2521 EXPORT_SYMBOL(sock_no_shutdown);
2522
2523 int sock_no_setsockopt(struct socket *sock, int level, int optname,
2524 char __user *optval, unsigned int optlen)
2525 {
2526 return -EOPNOTSUPP;
2527 }
2528 EXPORT_SYMBOL(sock_no_setsockopt);
2529
2530 int sock_no_getsockopt(struct socket *sock, int level, int optname,
2531 char __user *optval, int __user *optlen)
2532 {
2533 return -EOPNOTSUPP;
2534 }
2535 EXPORT_SYMBOL(sock_no_getsockopt);
2536
2537 int sock_no_sendmsg(struct socket *sock, struct msghdr *m, size_t len)
2538 {
2539 return -EOPNOTSUPP;
2540 }
2541 EXPORT_SYMBOL(sock_no_sendmsg);
2542
2543 int sock_no_sendmsg_locked(struct sock *sk, struct msghdr *m, size_t len)
2544 {
2545 return -EOPNOTSUPP;
2546 }
2547 EXPORT_SYMBOL(sock_no_sendmsg_locked);
2548
2549 int sock_no_recvmsg(struct socket *sock, struct msghdr *m, size_t len,
2550 int flags)
2551 {
2552 return -EOPNOTSUPP;
2553 }
2554 EXPORT_SYMBOL(sock_no_recvmsg);
2555
2556 int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma)
2557 {
2558 /* Mirror missing mmap method error code */
2559 return -ENODEV;
2560 }
2561 EXPORT_SYMBOL(sock_no_mmap);
2562
2563 ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags)
2564 {
2565 ssize_t res;
2566 struct msghdr msg = {.msg_flags = flags};
2567 struct kvec iov;
2568 char *kaddr = kmap(page);
2569 iov.iov_base = kaddr + offset;
2570 iov.iov_len = size;
2571 res = kernel_sendmsg(sock, &msg, &iov, 1, size);
2572 kunmap(page);
2573 return res;
2574 }
2575 EXPORT_SYMBOL(sock_no_sendpage);
2576
2577 ssize_t sock_no_sendpage_locked(struct sock *sk, struct page *page,
2578 int offset, size_t size, int flags)
2579 {
2580 ssize_t res;
2581 struct msghdr msg = {.msg_flags = flags};
2582 struct kvec iov;
2583 char *kaddr = kmap(page);
2584
2585 iov.iov_base = kaddr + offset;
2586 iov.iov_len = size;
2587 res = kernel_sendmsg_locked(sk, &msg, &iov, 1, size);
2588 kunmap(page);
2589 return res;
2590 }
2591 EXPORT_SYMBOL(sock_no_sendpage_locked);
2592
2593 /*
2594 * Default Socket Callbacks
2595 */
2596
2597 static void sock_def_wakeup(struct sock *sk)
2598 {
2599 struct socket_wq *wq;
2600
2601 rcu_read_lock();
2602 wq = rcu_dereference(sk->sk_wq);
2603 if (skwq_has_sleeper(wq))
2604 wake_up_interruptible_all(&wq->wait);
2605 rcu_read_unlock();
2606 }
2607
2608 static void sock_def_error_report(struct sock *sk)
2609 {
2610 struct socket_wq *wq;
2611
2612 rcu_read_lock();
2613 wq = rcu_dereference(sk->sk_wq);
2614 if (skwq_has_sleeper(wq))
2615 wake_up_interruptible_poll(&wq->wait, POLLERR);
2616 sk_wake_async(sk, SOCK_WAKE_IO, POLL_ERR);
2617 rcu_read_unlock();
2618 }
2619
2620 static void sock_def_readable(struct sock *sk)
2621 {
2622 struct socket_wq *wq;
2623
2624 rcu_read_lock();
2625 wq = rcu_dereference(sk->sk_wq);
2626 if (skwq_has_sleeper(wq))
2627 wake_up_interruptible_sync_poll(&wq->wait, POLLIN | POLLPRI |
2628 POLLRDNORM | POLLRDBAND);
2629 sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN);
2630 rcu_read_unlock();
2631 }
2632
2633 static void sock_def_write_space(struct sock *sk)
2634 {
2635 struct socket_wq *wq;
2636
2637 rcu_read_lock();
2638
2639 /* Do not wake up a writer until he can make "significant"
2640 * progress. --DaveM
2641 */
2642 if ((refcount_read(&sk->sk_wmem_alloc) << 1) <= sk->sk_sndbuf) {
2643 wq = rcu_dereference(sk->sk_wq);
2644 if (skwq_has_sleeper(wq))
2645 wake_up_interruptible_sync_poll(&wq->wait, POLLOUT |
2646 POLLWRNORM | POLLWRBAND);
2647
2648 /* Should agree with poll, otherwise some programs break */
2649 if (sock_writeable(sk))
2650 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
2651 }
2652
2653 rcu_read_unlock();
2654 }
2655
2656 static void sock_def_destruct(struct sock *sk)
2657 {
2658 }
2659
2660 void sk_send_sigurg(struct sock *sk)
2661 {
2662 if (sk->sk_socket && sk->sk_socket->file)
2663 if (send_sigurg(&sk->sk_socket->file->f_owner))
2664 sk_wake_async(sk, SOCK_WAKE_URG, POLL_PRI);
2665 }
2666 EXPORT_SYMBOL(sk_send_sigurg);
2667
2668 void sk_reset_timer(struct sock *sk, struct timer_list* timer,
2669 unsigned long expires)
2670 {
2671 if (!mod_timer(timer, expires))
2672 sock_hold(sk);
2673 }
2674 EXPORT_SYMBOL(sk_reset_timer);
2675
2676 void sk_stop_timer(struct sock *sk, struct timer_list* timer)
2677 {
2678 if (del_timer(timer))
2679 __sock_put(sk);
2680 }
2681 EXPORT_SYMBOL(sk_stop_timer);
2682
2683 void sock_init_data(struct socket *sock, struct sock *sk)
2684 {
2685 sk_init_common(sk);
2686 sk->sk_send_head = NULL;
2687
2688 timer_setup(&sk->sk_timer, NULL, 0);
2689
2690 sk->sk_allocation = GFP_KERNEL;
2691 sk->sk_rcvbuf = sysctl_rmem_default;
2692 sk->sk_sndbuf = sysctl_wmem_default;
2693 sk->sk_state = TCP_CLOSE;
2694 sk_set_socket(sk, sock);
2695
2696 sock_set_flag(sk, SOCK_ZAPPED);
2697
2698 if (sock) {
2699 sk->sk_type = sock->type;
2700 sk->sk_wq = sock->wq;
2701 sock->sk = sk;
2702 sk->sk_uid = SOCK_INODE(sock)->i_uid;
2703 } else {
2704 sk->sk_wq = NULL;
2705 sk->sk_uid = make_kuid(sock_net(sk)->user_ns, 0);
2706 }
2707
2708 rwlock_init(&sk->sk_callback_lock);
2709 if (sk->sk_kern_sock)
2710 lockdep_set_class_and_name(
2711 &sk->sk_callback_lock,
2712 af_kern_callback_keys + sk->sk_family,
2713 af_family_kern_clock_key_strings[sk->sk_family]);
2714 else
2715 lockdep_set_class_and_name(
2716 &sk->sk_callback_lock,
2717 af_callback_keys + sk->sk_family,
2718 af_family_clock_key_strings[sk->sk_family]);
2719
2720 sk->sk_state_change = sock_def_wakeup;
2721 sk->sk_data_ready = sock_def_readable;
2722 sk->sk_write_space = sock_def_write_space;
2723 sk->sk_error_report = sock_def_error_report;
2724 sk->sk_destruct = sock_def_destruct;
2725
2726 sk->sk_frag.page = NULL;
2727 sk->sk_frag.offset = 0;
2728 sk->sk_peek_off = -1;
2729
2730 sk->sk_peer_pid = NULL;
2731 sk->sk_peer_cred = NULL;
2732 sk->sk_write_pending = 0;
2733 sk->sk_rcvlowat = 1;
2734 sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT;
2735 sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT;
2736
2737 sk->sk_stamp = SK_DEFAULT_STAMP;
2738 #if BITS_PER_LONG==32
2739 seqlock_init(&sk->sk_stamp_seq);
2740 #endif
2741 atomic_set(&sk->sk_zckey, 0);
2742
2743 #ifdef CONFIG_NET_RX_BUSY_POLL
2744 sk->sk_napi_id = 0;
2745 sk->sk_ll_usec = sysctl_net_busy_read;
2746 #endif
2747
2748 sk->sk_max_pacing_rate = ~0U;
2749 sk->sk_pacing_rate = ~0U;
2750 sk->sk_pacing_shift = 10;
2751 sk->sk_incoming_cpu = -1;
2752 /*
2753 * Before updating sk_refcnt, we must commit prior changes to memory
2754 * (Documentation/RCU/rculist_nulls.txt for details)
2755 */
2756 smp_wmb();
2757 refcount_set(&sk->sk_refcnt, 1);
2758 atomic_set(&sk->sk_drops, 0);
2759 }
2760 EXPORT_SYMBOL(sock_init_data);
2761
2762 void lock_sock_nested(struct sock *sk, int subclass)
2763 {
2764 might_sleep();
2765 spin_lock_bh(&sk->sk_lock.slock);
2766 if (sk->sk_lock.owned)
2767 __lock_sock(sk);
2768 sk->sk_lock.owned = 1;
2769 spin_unlock(&sk->sk_lock.slock);
2770 /*
2771 * The sk_lock has mutex_lock() semantics here:
2772 */
2773 mutex_acquire(&sk->sk_lock.dep_map, subclass, 0, _RET_IP_);
2774 local_bh_enable();
2775 }
2776 EXPORT_SYMBOL(lock_sock_nested);
2777
2778 void release_sock(struct sock *sk)
2779 {
2780 spin_lock_bh(&sk->sk_lock.slock);
2781 if (sk->sk_backlog.tail)
2782 __release_sock(sk);
2783
2784 /* Warning : release_cb() might need to release sk ownership,
2785 * ie call sock_release_ownership(sk) before us.
2786 */
2787 if (sk->sk_prot->release_cb)
2788 sk->sk_prot->release_cb(sk);
2789
2790 sock_release_ownership(sk);
2791 if (waitqueue_active(&sk->sk_lock.wq))
2792 wake_up(&sk->sk_lock.wq);
2793 spin_unlock_bh(&sk->sk_lock.slock);
2794 }
2795 EXPORT_SYMBOL(release_sock);
2796
2797 /**
2798 * lock_sock_fast - fast version of lock_sock
2799 * @sk: socket
2800 *
2801 * This version should be used for very small section, where process wont block
2802 * return false if fast path is taken:
2803 *
2804 * sk_lock.slock locked, owned = 0, BH disabled
2805 *
2806 * return true if slow path is taken:
2807 *
2808 * sk_lock.slock unlocked, owned = 1, BH enabled
2809 */
2810 bool lock_sock_fast(struct sock *sk)
2811 {
2812 might_sleep();
2813 spin_lock_bh(&sk->sk_lock.slock);
2814
2815 if (!sk->sk_lock.owned)
2816 /*
2817 * Note : We must disable BH
2818 */
2819 return false;
2820
2821 __lock_sock(sk);
2822 sk->sk_lock.owned = 1;
2823 spin_unlock(&sk->sk_lock.slock);
2824 /*
2825 * The sk_lock has mutex_lock() semantics here:
2826 */
2827 mutex_acquire(&sk->sk_lock.dep_map, 0, 0, _RET_IP_);
2828 local_bh_enable();
2829 return true;
2830 }
2831 EXPORT_SYMBOL(lock_sock_fast);
2832
2833 int sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp)
2834 {
2835 struct timeval tv;
2836 if (!sock_flag(sk, SOCK_TIMESTAMP))
2837 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
2838 tv = ktime_to_timeval(sk->sk_stamp);
2839 if (tv.tv_sec == -1)
2840 return -ENOENT;
2841 if (tv.tv_sec == 0) {
2842 sk->sk_stamp = ktime_get_real();
2843 tv = ktime_to_timeval(sk->sk_stamp);
2844 }
2845 return copy_to_user(userstamp, &tv, sizeof(tv)) ? -EFAULT : 0;
2846 }
2847 EXPORT_SYMBOL(sock_get_timestamp);
2848
2849 int sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp)
2850 {
2851 struct timespec ts;
2852 if (!sock_flag(sk, SOCK_TIMESTAMP))
2853 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
2854 ts = ktime_to_timespec(sk->sk_stamp);
2855 if (ts.tv_sec == -1)
2856 return -ENOENT;
2857 if (ts.tv_sec == 0) {
2858 sk->sk_stamp = ktime_get_real();
2859 ts = ktime_to_timespec(sk->sk_stamp);
2860 }
2861 return copy_to_user(userstamp, &ts, sizeof(ts)) ? -EFAULT : 0;
2862 }
2863 EXPORT_SYMBOL(sock_get_timestampns);
2864
2865 void sock_enable_timestamp(struct sock *sk, int flag)
2866 {
2867 if (!sock_flag(sk, flag)) {
2868 unsigned long previous_flags = sk->sk_flags;
2869
2870 sock_set_flag(sk, flag);
2871 /*
2872 * we just set one of the two flags which require net
2873 * time stamping, but time stamping might have been on
2874 * already because of the other one
2875 */
2876 if (sock_needs_netstamp(sk) &&
2877 !(previous_flags & SK_FLAGS_TIMESTAMP))
2878 net_enable_timestamp();
2879 }
2880 }
2881
2882 int sock_recv_errqueue(struct sock *sk, struct msghdr *msg, int len,
2883 int level, int type)
2884 {
2885 struct sock_exterr_skb *serr;
2886 struct sk_buff *skb;
2887 int copied, err;
2888
2889 err = -EAGAIN;
2890 skb = sock_dequeue_err_skb(sk);
2891 if (skb == NULL)
2892 goto out;
2893
2894 copied = skb->len;
2895 if (copied > len) {
2896 msg->msg_flags |= MSG_TRUNC;
2897 copied = len;
2898 }
2899 err = skb_copy_datagram_msg(skb, 0, msg, copied);
2900 if (err)
2901 goto out_free_skb;
2902
2903 sock_recv_timestamp(msg, sk, skb);
2904
2905 serr = SKB_EXT_ERR(skb);
2906 put_cmsg(msg, level, type, sizeof(serr->ee), &serr->ee);
2907
2908 msg->msg_flags |= MSG_ERRQUEUE;
2909 err = copied;
2910
2911 out_free_skb:
2912 kfree_skb(skb);
2913 out:
2914 return err;
2915 }
2916 EXPORT_SYMBOL(sock_recv_errqueue);
2917
2918 /*
2919 * Get a socket option on an socket.
2920 *
2921 * FIX: POSIX 1003.1g is very ambiguous here. It states that
2922 * asynchronous errors should be reported by getsockopt. We assume
2923 * this means if you specify SO_ERROR (otherwise whats the point of it).
2924 */
2925 int sock_common_getsockopt(struct socket *sock, int level, int optname,
2926 char __user *optval, int __user *optlen)
2927 {
2928 struct sock *sk = sock->sk;
2929
2930 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
2931 }
2932 EXPORT_SYMBOL(sock_common_getsockopt);
2933
2934 #ifdef CONFIG_COMPAT
2935 int compat_sock_common_getsockopt(struct socket *sock, int level, int optname,
2936 char __user *optval, int __user *optlen)
2937 {
2938 struct sock *sk = sock->sk;
2939
2940 if (sk->sk_prot->compat_getsockopt != NULL)
2941 return sk->sk_prot->compat_getsockopt(sk, level, optname,
2942 optval, optlen);
2943 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
2944 }
2945 EXPORT_SYMBOL(compat_sock_common_getsockopt);
2946 #endif
2947
2948 int sock_common_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
2949 int flags)
2950 {
2951 struct sock *sk = sock->sk;
2952 int addr_len = 0;
2953 int err;
2954
2955 err = sk->sk_prot->recvmsg(sk, msg, size, flags & MSG_DONTWAIT,
2956 flags & ~MSG_DONTWAIT, &addr_len);
2957 if (err >= 0)
2958 msg->msg_namelen = addr_len;
2959 return err;
2960 }
2961 EXPORT_SYMBOL(sock_common_recvmsg);
2962
2963 /*
2964 * Set socket options on an inet socket.
2965 */
2966 int sock_common_setsockopt(struct socket *sock, int level, int optname,
2967 char __user *optval, unsigned int optlen)
2968 {
2969 struct sock *sk = sock->sk;
2970
2971 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
2972 }
2973 EXPORT_SYMBOL(sock_common_setsockopt);
2974
2975 #ifdef CONFIG_COMPAT
2976 int compat_sock_common_setsockopt(struct socket *sock, int level, int optname,
2977 char __user *optval, unsigned int optlen)
2978 {
2979 struct sock *sk = sock->sk;
2980
2981 if (sk->sk_prot->compat_setsockopt != NULL)
2982 return sk->sk_prot->compat_setsockopt(sk, level, optname,
2983 optval, optlen);
2984 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
2985 }
2986 EXPORT_SYMBOL(compat_sock_common_setsockopt);
2987 #endif
2988
2989 void sk_common_release(struct sock *sk)
2990 {
2991 if (sk->sk_prot->destroy)
2992 sk->sk_prot->destroy(sk);
2993
2994 /*
2995 * Observation: when sock_common_release is called, processes have
2996 * no access to socket. But net still has.
2997 * Step one, detach it from networking:
2998 *
2999 * A. Remove from hash tables.
3000 */
3001
3002 sk->sk_prot->unhash(sk);
3003
3004 /*
3005 * In this point socket cannot receive new packets, but it is possible
3006 * that some packets are in flight because some CPU runs receiver and
3007 * did hash table lookup before we unhashed socket. They will achieve
3008 * receive queue and will be purged by socket destructor.
3009 *
3010 * Also we still have packets pending on receive queue and probably,
3011 * our own packets waiting in device queues. sock_destroy will drain
3012 * receive queue, but transmitted packets will delay socket destruction
3013 * until the last reference will be released.
3014 */
3015
3016 sock_orphan(sk);
3017
3018 xfrm_sk_free_policy(sk);
3019
3020 sk_refcnt_debug_release(sk);
3021
3022 sock_put(sk);
3023 }
3024 EXPORT_SYMBOL(sk_common_release);
3025
3026 void sk_get_meminfo(const struct sock *sk, u32 *mem)
3027 {
3028 memset(mem, 0, sizeof(*mem) * SK_MEMINFO_VARS);
3029
3030 mem[SK_MEMINFO_RMEM_ALLOC] = sk_rmem_alloc_get(sk);
3031 mem[SK_MEMINFO_RCVBUF] = sk->sk_rcvbuf;
3032 mem[SK_MEMINFO_WMEM_ALLOC] = sk_wmem_alloc_get(sk);
3033 mem[SK_MEMINFO_SNDBUF] = sk->sk_sndbuf;
3034 mem[SK_MEMINFO_FWD_ALLOC] = sk->sk_forward_alloc;
3035 mem[SK_MEMINFO_WMEM_QUEUED] = sk->sk_wmem_queued;
3036 mem[SK_MEMINFO_OPTMEM] = atomic_read(&sk->sk_omem_alloc);
3037 mem[SK_MEMINFO_BACKLOG] = sk->sk_backlog.len;
3038 mem[SK_MEMINFO_DROPS] = atomic_read(&sk->sk_drops);
3039 }
3040
3041 #ifdef CONFIG_PROC_FS
3042 #define PROTO_INUSE_NR 64 /* should be enough for the first time */
3043 struct prot_inuse {
3044 int val[PROTO_INUSE_NR];
3045 };
3046
3047 static DECLARE_BITMAP(proto_inuse_idx, PROTO_INUSE_NR);
3048
3049 void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
3050 {
3051 __this_cpu_add(net->core.inuse->val[prot->inuse_idx], val);
3052 }
3053 EXPORT_SYMBOL_GPL(sock_prot_inuse_add);
3054
3055 int sock_prot_inuse_get(struct net *net, struct proto *prot)
3056 {
3057 int cpu, idx = prot->inuse_idx;
3058 int res = 0;
3059
3060 for_each_possible_cpu(cpu)
3061 res += per_cpu_ptr(net->core.inuse, cpu)->val[idx];
3062
3063 return res >= 0 ? res : 0;
3064 }
3065 EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
3066
3067 static int __net_init sock_inuse_init_net(struct net *net)
3068 {
3069 net->core.inuse = alloc_percpu(struct prot_inuse);
3070 return net->core.inuse ? 0 : -ENOMEM;
3071 }
3072
3073 static void __net_exit sock_inuse_exit_net(struct net *net)
3074 {
3075 free_percpu(net->core.inuse);
3076 }
3077
3078 static struct pernet_operations net_inuse_ops = {
3079 .init = sock_inuse_init_net,
3080 .exit = sock_inuse_exit_net,
3081 };
3082
3083 static __init int net_inuse_init(void)
3084 {
3085 if (register_pernet_subsys(&net_inuse_ops))
3086 panic("Cannot initialize net inuse counters");
3087
3088 return 0;
3089 }
3090
3091 core_initcall(net_inuse_init);
3092
3093 static void assign_proto_idx(struct proto *prot)
3094 {
3095 prot->inuse_idx = find_first_zero_bit(proto_inuse_idx, PROTO_INUSE_NR);
3096
3097 if (unlikely(prot->inuse_idx == PROTO_INUSE_NR - 1)) {
3098 pr_err("PROTO_INUSE_NR exhausted\n");
3099 return;
3100 }
3101
3102 set_bit(prot->inuse_idx, proto_inuse_idx);
3103 }
3104
3105 static void release_proto_idx(struct proto *prot)
3106 {
3107 if (prot->inuse_idx != PROTO_INUSE_NR - 1)
3108 clear_bit(prot->inuse_idx, proto_inuse_idx);
3109 }
3110 #else
3111 static inline void assign_proto_idx(struct proto *prot)
3112 {
3113 }
3114
3115 static inline void release_proto_idx(struct proto *prot)
3116 {
3117 }
3118 #endif
3119
3120 static void req_prot_cleanup(struct request_sock_ops *rsk_prot)
3121 {
3122 if (!rsk_prot)
3123 return;
3124 kfree(rsk_prot->slab_name);
3125 rsk_prot->slab_name = NULL;
3126 kmem_cache_destroy(rsk_prot->slab);
3127 rsk_prot->slab = NULL;
3128 }
3129
3130 static int req_prot_init(const struct proto *prot)
3131 {
3132 struct request_sock_ops *rsk_prot = prot->rsk_prot;
3133
3134 if (!rsk_prot)
3135 return 0;
3136
3137 rsk_prot->slab_name = kasprintf(GFP_KERNEL, "request_sock_%s",
3138 prot->name);
3139 if (!rsk_prot->slab_name)
3140 return -ENOMEM;
3141
3142 rsk_prot->slab = kmem_cache_create(rsk_prot->slab_name,
3143 rsk_prot->obj_size, 0,
3144 prot->slab_flags, NULL);
3145
3146 if (!rsk_prot->slab) {
3147 pr_crit("%s: Can't create request sock SLAB cache!\n",
3148 prot->name);
3149 return -ENOMEM;
3150 }
3151 return 0;
3152 }
3153
3154 int proto_register(struct proto *prot, int alloc_slab)
3155 {
3156 if (alloc_slab) {
3157 prot->slab = kmem_cache_create(prot->name, prot->obj_size, 0,
3158 SLAB_HWCACHE_ALIGN | prot->slab_flags,
3159 NULL);
3160
3161 if (prot->slab == NULL) {
3162 pr_crit("%s: Can't create sock SLAB cache!\n",
3163 prot->name);
3164 goto out;
3165 }
3166
3167 if (req_prot_init(prot))
3168 goto out_free_request_sock_slab;
3169
3170 if (prot->twsk_prot != NULL) {
3171 prot->twsk_prot->twsk_slab_name = kasprintf(GFP_KERNEL, "tw_sock_%s", prot->name);
3172
3173 if (prot->twsk_prot->twsk_slab_name == NULL)
3174 goto out_free_request_sock_slab;
3175
3176 prot->twsk_prot->twsk_slab =
3177 kmem_cache_create(prot->twsk_prot->twsk_slab_name,
3178 prot->twsk_prot->twsk_obj_size,
3179 0,
3180 prot->slab_flags,
3181 NULL);
3182 if (prot->twsk_prot->twsk_slab == NULL)
3183 goto out_free_timewait_sock_slab_name;
3184 }
3185 }
3186
3187 mutex_lock(&proto_list_mutex);
3188 list_add(&prot->node, &proto_list);
3189 assign_proto_idx(prot);
3190 mutex_unlock(&proto_list_mutex);
3191 return 0;
3192
3193 out_free_timewait_sock_slab_name:
3194 kfree(prot->twsk_prot->twsk_slab_name);
3195 out_free_request_sock_slab:
3196 req_prot_cleanup(prot->rsk_prot);
3197
3198 kmem_cache_destroy(prot->slab);
3199 prot->slab = NULL;
3200 out:
3201 return -ENOBUFS;
3202 }
3203 EXPORT_SYMBOL(proto_register);
3204
3205 void proto_unregister(struct proto *prot)
3206 {
3207 mutex_lock(&proto_list_mutex);
3208 release_proto_idx(prot);
3209 list_del(&prot->node);
3210 mutex_unlock(&proto_list_mutex);
3211
3212 kmem_cache_destroy(prot->slab);
3213 prot->slab = NULL;
3214
3215 req_prot_cleanup(prot->rsk_prot);
3216
3217 if (prot->twsk_prot != NULL && prot->twsk_prot->twsk_slab != NULL) {
3218 kmem_cache_destroy(prot->twsk_prot->twsk_slab);
3219 kfree(prot->twsk_prot->twsk_slab_name);
3220 prot->twsk_prot->twsk_slab = NULL;
3221 }
3222 }
3223 EXPORT_SYMBOL(proto_unregister);
3224
3225 #ifdef CONFIG_PROC_FS
3226 static void *proto_seq_start(struct seq_file *seq, loff_t *pos)
3227 __acquires(proto_list_mutex)
3228 {
3229 mutex_lock(&proto_list_mutex);
3230 return seq_list_start_head(&proto_list, *pos);
3231 }
3232
3233 static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3234 {
3235 return seq_list_next(v, &proto_list, pos);
3236 }
3237
3238 static void proto_seq_stop(struct seq_file *seq, void *v)
3239 __releases(proto_list_mutex)
3240 {
3241 mutex_unlock(&proto_list_mutex);
3242 }
3243
3244 static char proto_method_implemented(const void *method)
3245 {
3246 return method == NULL ? 'n' : 'y';
3247 }
3248 static long sock_prot_memory_allocated(struct proto *proto)
3249 {
3250 return proto->memory_allocated != NULL ? proto_memory_allocated(proto) : -1L;
3251 }
3252
3253 static char *sock_prot_memory_pressure(struct proto *proto)
3254 {
3255 return proto->memory_pressure != NULL ?
3256 proto_memory_pressure(proto) ? "yes" : "no" : "NI";
3257 }
3258
3259 static void proto_seq_printf(struct seq_file *seq, struct proto *proto)
3260 {
3261
3262 seq_printf(seq, "%-9s %4u %6d %6ld %-3s %6u %-3s %-10s "
3263 "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n",
3264 proto->name,
3265 proto->obj_size,
3266 sock_prot_inuse_get(seq_file_net(seq), proto),
3267 sock_prot_memory_allocated(proto),
3268 sock_prot_memory_pressure(proto),
3269 proto->max_header,
3270 proto->slab == NULL ? "no" : "yes",
3271 module_name(proto->owner),
3272 proto_method_implemented(proto->close),
3273 proto_method_implemented(proto->connect),
3274 proto_method_implemented(proto->disconnect),
3275 proto_method_implemented(proto->accept),
3276 proto_method_implemented(proto->ioctl),
3277 proto_method_implemented(proto->init),
3278 proto_method_implemented(proto->destroy),
3279 proto_method_implemented(proto->shutdown),
3280 proto_method_implemented(proto->setsockopt),
3281 proto_method_implemented(proto->getsockopt),
3282 proto_method_implemented(proto->sendmsg),
3283 proto_method_implemented(proto->recvmsg),
3284 proto_method_implemented(proto->sendpage),
3285 proto_method_implemented(proto->bind),
3286 proto_method_implemented(proto->backlog_rcv),
3287 proto_method_implemented(proto->hash),
3288 proto_method_implemented(proto->unhash),
3289 proto_method_implemented(proto->get_port),
3290 proto_method_implemented(proto->enter_memory_pressure));
3291 }
3292
3293 static int proto_seq_show(struct seq_file *seq, void *v)
3294 {
3295 if (v == &proto_list)
3296 seq_printf(seq, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s",
3297 "protocol",
3298 "size",
3299 "sockets",
3300 "memory",
3301 "press",
3302 "maxhdr",
3303 "slab",
3304 "module",
3305 "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n");
3306 else
3307 proto_seq_printf(seq, list_entry(v, struct proto, node));
3308 return 0;
3309 }
3310
3311 static const struct seq_operations proto_seq_ops = {
3312 .start = proto_seq_start,
3313 .next = proto_seq_next,
3314 .stop = proto_seq_stop,
3315 .show = proto_seq_show,
3316 };
3317
3318 static int proto_seq_open(struct inode *inode, struct file *file)
3319 {
3320 return seq_open_net(inode, file, &proto_seq_ops,
3321 sizeof(struct seq_net_private));
3322 }
3323
3324 static const struct file_operations proto_seq_fops = {
3325 .owner = THIS_MODULE,
3326 .open = proto_seq_open,
3327 .read = seq_read,
3328 .llseek = seq_lseek,
3329 .release = seq_release_net,
3330 };
3331
3332 static __net_init int proto_init_net(struct net *net)
3333 {
3334 if (!proc_create("protocols", S_IRUGO, net->proc_net, &proto_seq_fops))
3335 return -ENOMEM;
3336
3337 return 0;
3338 }
3339
3340 static __net_exit void proto_exit_net(struct net *net)
3341 {
3342 remove_proc_entry("protocols", net->proc_net);
3343 }
3344
3345
3346 static __net_initdata struct pernet_operations proto_net_ops = {
3347 .init = proto_init_net,
3348 .exit = proto_exit_net,
3349 };
3350
3351 static int __init proto_init(void)
3352 {
3353 return register_pernet_subsys(&proto_net_ops);
3354 }
3355
3356 subsys_initcall(proto_init);
3357
3358 #endif /* PROC_FS */
3359
3360 #ifdef CONFIG_NET_RX_BUSY_POLL
3361 bool sk_busy_loop_end(void *p, unsigned long start_time)
3362 {
3363 struct sock *sk = p;
3364
3365 return !skb_queue_empty_lockless(&sk->sk_receive_queue) ||
3366 sk_busy_loop_timeout(sk, start_time);
3367 }
3368 EXPORT_SYMBOL(sk_busy_loop_end);
3369 #endif /* CONFIG_NET_RX_BUSY_POLL */
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