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Merge tag 'io_uring-5.7-2020-05-22' of git://git.kernel.dk/linux-block
[thirdparty/linux.git] / net / core / sock.c
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * INET An implementation of the TCP/IP protocol suite for the LINUX
4 * operating system. INET is implemented using the BSD Socket
5 * interface as the means of communication with the user level.
6 *
7 * Generic socket support routines. Memory allocators, socket lock/release
8 * handler for protocols to use and generic option handler.
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 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
87
88 #include <asm/unaligned.h>
89 #include <linux/capability.h>
90 #include <linux/errno.h>
91 #include <linux/errqueue.h>
92 #include <linux/types.h>
93 #include <linux/socket.h>
94 #include <linux/in.h>
95 #include <linux/kernel.h>
96 #include <linux/module.h>
97 #include <linux/proc_fs.h>
98 #include <linux/seq_file.h>
99 #include <linux/sched.h>
100 #include <linux/sched/mm.h>
101 #include <linux/timer.h>
102 #include <linux/string.h>
103 #include <linux/sockios.h>
104 #include <linux/net.h>
105 #include <linux/mm.h>
106 #include <linux/slab.h>
107 #include <linux/interrupt.h>
108 #include <linux/poll.h>
109 #include <linux/tcp.h>
110 #include <linux/init.h>
111 #include <linux/highmem.h>
112 #include <linux/user_namespace.h>
113 #include <linux/static_key.h>
114 #include <linux/memcontrol.h>
115 #include <linux/prefetch.h>
116
117 #include <linux/uaccess.h>
118
119 #include <linux/netdevice.h>
120 #include <net/protocol.h>
121 #include <linux/skbuff.h>
122 #include <net/net_namespace.h>
123 #include <net/request_sock.h>
124 #include <net/sock.h>
125 #include <linux/net_tstamp.h>
126 #include <net/xfrm.h>
127 #include <linux/ipsec.h>
128 #include <net/cls_cgroup.h>
129 #include <net/netprio_cgroup.h>
130 #include <linux/sock_diag.h>
131
132 #include <linux/filter.h>
133 #include <net/sock_reuseport.h>
134 #include <net/bpf_sk_storage.h>
135
136 #include <trace/events/sock.h>
137
138 #include <net/tcp.h>
139 #include <net/busy_poll.h>
140
141 static DEFINE_MUTEX(proto_list_mutex);
142 static LIST_HEAD(proto_list);
143
144 static void sock_inuse_add(struct net *net, int val);
145
146 /**
147 * sk_ns_capable - General socket capability test
148 * @sk: Socket to use a capability on or through
149 * @user_ns: The user namespace of the capability to use
150 * @cap: The capability to use
151 *
152 * Test to see if the opener of the socket had when the socket was
153 * created and the current process has the capability @cap in the user
154 * namespace @user_ns.
155 */
156 bool sk_ns_capable(const struct sock *sk,
157 struct user_namespace *user_ns, int cap)
158 {
159 return file_ns_capable(sk->sk_socket->file, user_ns, cap) &&
160 ns_capable(user_ns, cap);
161 }
162 EXPORT_SYMBOL(sk_ns_capable);
163
164 /**
165 * sk_capable - Socket global capability test
166 * @sk: Socket to use a capability on or through
167 * @cap: The global capability to use
168 *
169 * Test to see if the opener of the socket had when the socket was
170 * created and the current process has the capability @cap in all user
171 * namespaces.
172 */
173 bool sk_capable(const struct sock *sk, int cap)
174 {
175 return sk_ns_capable(sk, &init_user_ns, cap);
176 }
177 EXPORT_SYMBOL(sk_capable);
178
179 /**
180 * sk_net_capable - Network namespace socket capability test
181 * @sk: Socket to use a capability on or through
182 * @cap: The capability to use
183 *
184 * Test to see if the opener of the socket had when the socket was created
185 * and the current process has the capability @cap over the network namespace
186 * the socket is a member of.
187 */
188 bool sk_net_capable(const struct sock *sk, int cap)
189 {
190 return sk_ns_capable(sk, sock_net(sk)->user_ns, cap);
191 }
192 EXPORT_SYMBOL(sk_net_capable);
193
194 /*
195 * Each address family might have different locking rules, so we have
196 * one slock key per address family and separate keys for internal and
197 * userspace sockets.
198 */
199 static struct lock_class_key af_family_keys[AF_MAX];
200 static struct lock_class_key af_family_kern_keys[AF_MAX];
201 static struct lock_class_key af_family_slock_keys[AF_MAX];
202 static struct lock_class_key af_family_kern_slock_keys[AF_MAX];
203
204 /*
205 * Make lock validator output more readable. (we pre-construct these
206 * strings build-time, so that runtime initialization of socket
207 * locks is fast):
208 */
209
210 #define _sock_locks(x) \
211 x "AF_UNSPEC", x "AF_UNIX" , x "AF_INET" , \
212 x "AF_AX25" , x "AF_IPX" , x "AF_APPLETALK", \
213 x "AF_NETROM", x "AF_BRIDGE" , x "AF_ATMPVC" , \
214 x "AF_X25" , x "AF_INET6" , x "AF_ROSE" , \
215 x "AF_DECnet", x "AF_NETBEUI" , x "AF_SECURITY" , \
216 x "AF_KEY" , x "AF_NETLINK" , x "AF_PACKET" , \
217 x "AF_ASH" , x "AF_ECONET" , x "AF_ATMSVC" , \
218 x "AF_RDS" , x "AF_SNA" , x "AF_IRDA" , \
219 x "AF_PPPOX" , x "AF_WANPIPE" , x "AF_LLC" , \
220 x "27" , x "28" , x "AF_CAN" , \
221 x "AF_TIPC" , x "AF_BLUETOOTH", x "IUCV" , \
222 x "AF_RXRPC" , x "AF_ISDN" , x "AF_PHONET" , \
223 x "AF_IEEE802154", x "AF_CAIF" , x "AF_ALG" , \
224 x "AF_NFC" , x "AF_VSOCK" , x "AF_KCM" , \
225 x "AF_QIPCRTR", x "AF_SMC" , x "AF_XDP" , \
226 x "AF_MAX"
227
228 static const char *const af_family_key_strings[AF_MAX+1] = {
229 _sock_locks("sk_lock-")
230 };
231 static const char *const af_family_slock_key_strings[AF_MAX+1] = {
232 _sock_locks("slock-")
233 };
234 static const char *const af_family_clock_key_strings[AF_MAX+1] = {
235 _sock_locks("clock-")
236 };
237
238 static const char *const af_family_kern_key_strings[AF_MAX+1] = {
239 _sock_locks("k-sk_lock-")
240 };
241 static const char *const af_family_kern_slock_key_strings[AF_MAX+1] = {
242 _sock_locks("k-slock-")
243 };
244 static const char *const af_family_kern_clock_key_strings[AF_MAX+1] = {
245 _sock_locks("k-clock-")
246 };
247 static const char *const af_family_rlock_key_strings[AF_MAX+1] = {
248 _sock_locks("rlock-")
249 };
250 static const char *const af_family_wlock_key_strings[AF_MAX+1] = {
251 _sock_locks("wlock-")
252 };
253 static const char *const af_family_elock_key_strings[AF_MAX+1] = {
254 _sock_locks("elock-")
255 };
256
257 /*
258 * sk_callback_lock and sk queues locking rules are per-address-family,
259 * so split the lock classes by using a per-AF key:
260 */
261 static struct lock_class_key af_callback_keys[AF_MAX];
262 static struct lock_class_key af_rlock_keys[AF_MAX];
263 static struct lock_class_key af_wlock_keys[AF_MAX];
264 static struct lock_class_key af_elock_keys[AF_MAX];
265 static struct lock_class_key af_kern_callback_keys[AF_MAX];
266
267 /* Run time adjustable parameters. */
268 __u32 sysctl_wmem_max __read_mostly = SK_WMEM_MAX;
269 EXPORT_SYMBOL(sysctl_wmem_max);
270 __u32 sysctl_rmem_max __read_mostly = SK_RMEM_MAX;
271 EXPORT_SYMBOL(sysctl_rmem_max);
272 __u32 sysctl_wmem_default __read_mostly = SK_WMEM_MAX;
273 __u32 sysctl_rmem_default __read_mostly = SK_RMEM_MAX;
274
275 /* Maximal space eaten by iovec or ancillary data plus some space */
276 int sysctl_optmem_max __read_mostly = sizeof(unsigned long)*(2*UIO_MAXIOV+512);
277 EXPORT_SYMBOL(sysctl_optmem_max);
278
279 int sysctl_tstamp_allow_data __read_mostly = 1;
280
281 DEFINE_STATIC_KEY_FALSE(memalloc_socks_key);
282 EXPORT_SYMBOL_GPL(memalloc_socks_key);
283
284 /**
285 * sk_set_memalloc - sets %SOCK_MEMALLOC
286 * @sk: socket to set it on
287 *
288 * Set %SOCK_MEMALLOC on a socket for access to emergency reserves.
289 * It's the responsibility of the admin to adjust min_free_kbytes
290 * to meet the requirements
291 */
292 void sk_set_memalloc(struct sock *sk)
293 {
294 sock_set_flag(sk, SOCK_MEMALLOC);
295 sk->sk_allocation |= __GFP_MEMALLOC;
296 static_branch_inc(&memalloc_socks_key);
297 }
298 EXPORT_SYMBOL_GPL(sk_set_memalloc);
299
300 void sk_clear_memalloc(struct sock *sk)
301 {
302 sock_reset_flag(sk, SOCK_MEMALLOC);
303 sk->sk_allocation &= ~__GFP_MEMALLOC;
304 static_branch_dec(&memalloc_socks_key);
305
306 /*
307 * SOCK_MEMALLOC is allowed to ignore rmem limits to ensure forward
308 * progress of swapping. SOCK_MEMALLOC may be cleared while
309 * it has rmem allocations due to the last swapfile being deactivated
310 * but there is a risk that the socket is unusable due to exceeding
311 * the rmem limits. Reclaim the reserves and obey rmem limits again.
312 */
313 sk_mem_reclaim(sk);
314 }
315 EXPORT_SYMBOL_GPL(sk_clear_memalloc);
316
317 int __sk_backlog_rcv(struct sock *sk, struct sk_buff *skb)
318 {
319 int ret;
320 unsigned int noreclaim_flag;
321
322 /* these should have been dropped before queueing */
323 BUG_ON(!sock_flag(sk, SOCK_MEMALLOC));
324
325 noreclaim_flag = memalloc_noreclaim_save();
326 ret = sk->sk_backlog_rcv(sk, skb);
327 memalloc_noreclaim_restore(noreclaim_flag);
328
329 return ret;
330 }
331 EXPORT_SYMBOL(__sk_backlog_rcv);
332
333 static int sock_get_timeout(long timeo, void *optval, bool old_timeval)
334 {
335 struct __kernel_sock_timeval tv;
336
337 if (timeo == MAX_SCHEDULE_TIMEOUT) {
338 tv.tv_sec = 0;
339 tv.tv_usec = 0;
340 } else {
341 tv.tv_sec = timeo / HZ;
342 tv.tv_usec = ((timeo % HZ) * USEC_PER_SEC) / HZ;
343 }
344
345 if (old_timeval && in_compat_syscall() && !COMPAT_USE_64BIT_TIME) {
346 struct old_timeval32 tv32 = { tv.tv_sec, tv.tv_usec };
347 *(struct old_timeval32 *)optval = tv32;
348 return sizeof(tv32);
349 }
350
351 if (old_timeval) {
352 struct __kernel_old_timeval old_tv;
353 old_tv.tv_sec = tv.tv_sec;
354 old_tv.tv_usec = tv.tv_usec;
355 *(struct __kernel_old_timeval *)optval = old_tv;
356 return sizeof(old_tv);
357 }
358
359 *(struct __kernel_sock_timeval *)optval = tv;
360 return sizeof(tv);
361 }
362
363 static int sock_set_timeout(long *timeo_p, char __user *optval, int optlen, bool old_timeval)
364 {
365 struct __kernel_sock_timeval tv;
366
367 if (old_timeval && in_compat_syscall() && !COMPAT_USE_64BIT_TIME) {
368 struct old_timeval32 tv32;
369
370 if (optlen < sizeof(tv32))
371 return -EINVAL;
372
373 if (copy_from_user(&tv32, optval, sizeof(tv32)))
374 return -EFAULT;
375 tv.tv_sec = tv32.tv_sec;
376 tv.tv_usec = tv32.tv_usec;
377 } else if (old_timeval) {
378 struct __kernel_old_timeval old_tv;
379
380 if (optlen < sizeof(old_tv))
381 return -EINVAL;
382 if (copy_from_user(&old_tv, optval, sizeof(old_tv)))
383 return -EFAULT;
384 tv.tv_sec = old_tv.tv_sec;
385 tv.tv_usec = old_tv.tv_usec;
386 } else {
387 if (optlen < sizeof(tv))
388 return -EINVAL;
389 if (copy_from_user(&tv, optval, sizeof(tv)))
390 return -EFAULT;
391 }
392 if (tv.tv_usec < 0 || tv.tv_usec >= USEC_PER_SEC)
393 return -EDOM;
394
395 if (tv.tv_sec < 0) {
396 static int warned __read_mostly;
397
398 *timeo_p = 0;
399 if (warned < 10 && net_ratelimit()) {
400 warned++;
401 pr_info("%s: `%s' (pid %d) tries to set negative timeout\n",
402 __func__, current->comm, task_pid_nr(current));
403 }
404 return 0;
405 }
406 *timeo_p = MAX_SCHEDULE_TIMEOUT;
407 if (tv.tv_sec == 0 && tv.tv_usec == 0)
408 return 0;
409 if (tv.tv_sec < (MAX_SCHEDULE_TIMEOUT / HZ - 1))
410 *timeo_p = tv.tv_sec * HZ + DIV_ROUND_UP((unsigned long)tv.tv_usec, USEC_PER_SEC / HZ);
411 return 0;
412 }
413
414 static void sock_warn_obsolete_bsdism(const char *name)
415 {
416 static int warned;
417 static char warncomm[TASK_COMM_LEN];
418 if (strcmp(warncomm, current->comm) && warned < 5) {
419 strcpy(warncomm, current->comm);
420 pr_warn("process `%s' is using obsolete %s SO_BSDCOMPAT\n",
421 warncomm, name);
422 warned++;
423 }
424 }
425
426 static bool sock_needs_netstamp(const struct sock *sk)
427 {
428 switch (sk->sk_family) {
429 case AF_UNSPEC:
430 case AF_UNIX:
431 return false;
432 default:
433 return true;
434 }
435 }
436
437 static void sock_disable_timestamp(struct sock *sk, unsigned long flags)
438 {
439 if (sk->sk_flags & flags) {
440 sk->sk_flags &= ~flags;
441 if (sock_needs_netstamp(sk) &&
442 !(sk->sk_flags & SK_FLAGS_TIMESTAMP))
443 net_disable_timestamp();
444 }
445 }
446
447
448 int __sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
449 {
450 unsigned long flags;
451 struct sk_buff_head *list = &sk->sk_receive_queue;
452
453 if (atomic_read(&sk->sk_rmem_alloc) >= sk->sk_rcvbuf) {
454 atomic_inc(&sk->sk_drops);
455 trace_sock_rcvqueue_full(sk, skb);
456 return -ENOMEM;
457 }
458
459 if (!sk_rmem_schedule(sk, skb, skb->truesize)) {
460 atomic_inc(&sk->sk_drops);
461 return -ENOBUFS;
462 }
463
464 skb->dev = NULL;
465 skb_set_owner_r(skb, sk);
466
467 /* we escape from rcu protected region, make sure we dont leak
468 * a norefcounted dst
469 */
470 skb_dst_force(skb);
471
472 spin_lock_irqsave(&list->lock, flags);
473 sock_skb_set_dropcount(sk, skb);
474 __skb_queue_tail(list, skb);
475 spin_unlock_irqrestore(&list->lock, flags);
476
477 if (!sock_flag(sk, SOCK_DEAD))
478 sk->sk_data_ready(sk);
479 return 0;
480 }
481 EXPORT_SYMBOL(__sock_queue_rcv_skb);
482
483 int sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
484 {
485 int err;
486
487 err = sk_filter(sk, skb);
488 if (err)
489 return err;
490
491 return __sock_queue_rcv_skb(sk, skb);
492 }
493 EXPORT_SYMBOL(sock_queue_rcv_skb);
494
495 int __sk_receive_skb(struct sock *sk, struct sk_buff *skb,
496 const int nested, unsigned int trim_cap, bool refcounted)
497 {
498 int rc = NET_RX_SUCCESS;
499
500 if (sk_filter_trim_cap(sk, skb, trim_cap))
501 goto discard_and_relse;
502
503 skb->dev = NULL;
504
505 if (sk_rcvqueues_full(sk, sk->sk_rcvbuf)) {
506 atomic_inc(&sk->sk_drops);
507 goto discard_and_relse;
508 }
509 if (nested)
510 bh_lock_sock_nested(sk);
511 else
512 bh_lock_sock(sk);
513 if (!sock_owned_by_user(sk)) {
514 /*
515 * trylock + unlock semantics:
516 */
517 mutex_acquire(&sk->sk_lock.dep_map, 0, 1, _RET_IP_);
518
519 rc = sk_backlog_rcv(sk, skb);
520
521 mutex_release(&sk->sk_lock.dep_map, _RET_IP_);
522 } else if (sk_add_backlog(sk, skb, READ_ONCE(sk->sk_rcvbuf))) {
523 bh_unlock_sock(sk);
524 atomic_inc(&sk->sk_drops);
525 goto discard_and_relse;
526 }
527
528 bh_unlock_sock(sk);
529 out:
530 if (refcounted)
531 sock_put(sk);
532 return rc;
533 discard_and_relse:
534 kfree_skb(skb);
535 goto out;
536 }
537 EXPORT_SYMBOL(__sk_receive_skb);
538
539 struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie)
540 {
541 struct dst_entry *dst = __sk_dst_get(sk);
542
543 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
544 sk_tx_queue_clear(sk);
545 sk->sk_dst_pending_confirm = 0;
546 RCU_INIT_POINTER(sk->sk_dst_cache, NULL);
547 dst_release(dst);
548 return NULL;
549 }
550
551 return dst;
552 }
553 EXPORT_SYMBOL(__sk_dst_check);
554
555 struct dst_entry *sk_dst_check(struct sock *sk, u32 cookie)
556 {
557 struct dst_entry *dst = sk_dst_get(sk);
558
559 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
560 sk_dst_reset(sk);
561 dst_release(dst);
562 return NULL;
563 }
564
565 return dst;
566 }
567 EXPORT_SYMBOL(sk_dst_check);
568
569 static int sock_setbindtodevice_locked(struct sock *sk, int ifindex)
570 {
571 int ret = -ENOPROTOOPT;
572 #ifdef CONFIG_NETDEVICES
573 struct net *net = sock_net(sk);
574
575 /* Sorry... */
576 ret = -EPERM;
577 if (sk->sk_bound_dev_if && !ns_capable(net->user_ns, CAP_NET_RAW))
578 goto out;
579
580 ret = -EINVAL;
581 if (ifindex < 0)
582 goto out;
583
584 sk->sk_bound_dev_if = ifindex;
585 if (sk->sk_prot->rehash)
586 sk->sk_prot->rehash(sk);
587 sk_dst_reset(sk);
588
589 ret = 0;
590
591 out:
592 #endif
593
594 return ret;
595 }
596
597 static int sock_setbindtodevice(struct sock *sk, char __user *optval,
598 int optlen)
599 {
600 int ret = -ENOPROTOOPT;
601 #ifdef CONFIG_NETDEVICES
602 struct net *net = sock_net(sk);
603 char devname[IFNAMSIZ];
604 int index;
605
606 ret = -EINVAL;
607 if (optlen < 0)
608 goto out;
609
610 /* Bind this socket to a particular device like "eth0",
611 * as specified in the passed interface name. If the
612 * name is "" or the option length is zero the socket
613 * is not bound.
614 */
615 if (optlen > IFNAMSIZ - 1)
616 optlen = IFNAMSIZ - 1;
617 memset(devname, 0, sizeof(devname));
618
619 ret = -EFAULT;
620 if (copy_from_user(devname, optval, optlen))
621 goto out;
622
623 index = 0;
624 if (devname[0] != '\0') {
625 struct net_device *dev;
626
627 rcu_read_lock();
628 dev = dev_get_by_name_rcu(net, devname);
629 if (dev)
630 index = dev->ifindex;
631 rcu_read_unlock();
632 ret = -ENODEV;
633 if (!dev)
634 goto out;
635 }
636
637 lock_sock(sk);
638 ret = sock_setbindtodevice_locked(sk, index);
639 release_sock(sk);
640
641 out:
642 #endif
643
644 return ret;
645 }
646
647 static int sock_getbindtodevice(struct sock *sk, char __user *optval,
648 int __user *optlen, int len)
649 {
650 int ret = -ENOPROTOOPT;
651 #ifdef CONFIG_NETDEVICES
652 struct net *net = sock_net(sk);
653 char devname[IFNAMSIZ];
654
655 if (sk->sk_bound_dev_if == 0) {
656 len = 0;
657 goto zero;
658 }
659
660 ret = -EINVAL;
661 if (len < IFNAMSIZ)
662 goto out;
663
664 ret = netdev_get_name(net, devname, sk->sk_bound_dev_if);
665 if (ret)
666 goto out;
667
668 len = strlen(devname) + 1;
669
670 ret = -EFAULT;
671 if (copy_to_user(optval, devname, len))
672 goto out;
673
674 zero:
675 ret = -EFAULT;
676 if (put_user(len, optlen))
677 goto out;
678
679 ret = 0;
680
681 out:
682 #endif
683
684 return ret;
685 }
686
687 static inline void sock_valbool_flag(struct sock *sk, enum sock_flags bit,
688 int valbool)
689 {
690 if (valbool)
691 sock_set_flag(sk, bit);
692 else
693 sock_reset_flag(sk, bit);
694 }
695
696 bool sk_mc_loop(struct sock *sk)
697 {
698 if (dev_recursion_level())
699 return false;
700 if (!sk)
701 return true;
702 switch (sk->sk_family) {
703 case AF_INET:
704 return inet_sk(sk)->mc_loop;
705 #if IS_ENABLED(CONFIG_IPV6)
706 case AF_INET6:
707 return inet6_sk(sk)->mc_loop;
708 #endif
709 }
710 WARN_ON(1);
711 return true;
712 }
713 EXPORT_SYMBOL(sk_mc_loop);
714
715 /*
716 * This is meant for all protocols to use and covers goings on
717 * at the socket level. Everything here is generic.
718 */
719
720 int sock_setsockopt(struct socket *sock, int level, int optname,
721 char __user *optval, unsigned int optlen)
722 {
723 struct sock_txtime sk_txtime;
724 struct sock *sk = sock->sk;
725 int val;
726 int valbool;
727 struct linger ling;
728 int ret = 0;
729
730 /*
731 * Options without arguments
732 */
733
734 if (optname == SO_BINDTODEVICE)
735 return sock_setbindtodevice(sk, optval, optlen);
736
737 if (optlen < sizeof(int))
738 return -EINVAL;
739
740 if (get_user(val, (int __user *)optval))
741 return -EFAULT;
742
743 valbool = val ? 1 : 0;
744
745 lock_sock(sk);
746
747 switch (optname) {
748 case SO_DEBUG:
749 if (val && !capable(CAP_NET_ADMIN))
750 ret = -EACCES;
751 else
752 sock_valbool_flag(sk, SOCK_DBG, valbool);
753 break;
754 case SO_REUSEADDR:
755 sk->sk_reuse = (valbool ? SK_CAN_REUSE : SK_NO_REUSE);
756 break;
757 case SO_REUSEPORT:
758 sk->sk_reuseport = valbool;
759 break;
760 case SO_TYPE:
761 case SO_PROTOCOL:
762 case SO_DOMAIN:
763 case SO_ERROR:
764 ret = -ENOPROTOOPT;
765 break;
766 case SO_DONTROUTE:
767 sock_valbool_flag(sk, SOCK_LOCALROUTE, valbool);
768 sk_dst_reset(sk);
769 break;
770 case SO_BROADCAST:
771 sock_valbool_flag(sk, SOCK_BROADCAST, valbool);
772 break;
773 case SO_SNDBUF:
774 /* Don't error on this BSD doesn't and if you think
775 * about it this is right. Otherwise apps have to
776 * play 'guess the biggest size' games. RCVBUF/SNDBUF
777 * are treated in BSD as hints
778 */
779 val = min_t(u32, val, sysctl_wmem_max);
780 set_sndbuf:
781 /* Ensure val * 2 fits into an int, to prevent max_t()
782 * from treating it as a negative value.
783 */
784 val = min_t(int, val, INT_MAX / 2);
785 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
786 WRITE_ONCE(sk->sk_sndbuf,
787 max_t(int, val * 2, SOCK_MIN_SNDBUF));
788 /* Wake up sending tasks if we upped the value. */
789 sk->sk_write_space(sk);
790 break;
791
792 case SO_SNDBUFFORCE:
793 if (!capable(CAP_NET_ADMIN)) {
794 ret = -EPERM;
795 break;
796 }
797
798 /* No negative values (to prevent underflow, as val will be
799 * multiplied by 2).
800 */
801 if (val < 0)
802 val = 0;
803 goto set_sndbuf;
804
805 case SO_RCVBUF:
806 /* Don't error on this BSD doesn't and if you think
807 * about it this is right. Otherwise apps have to
808 * play 'guess the biggest size' games. RCVBUF/SNDBUF
809 * are treated in BSD as hints
810 */
811 val = min_t(u32, val, sysctl_rmem_max);
812 set_rcvbuf:
813 /* Ensure val * 2 fits into an int, to prevent max_t()
814 * from treating it as a negative value.
815 */
816 val = min_t(int, val, INT_MAX / 2);
817 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
818 /*
819 * We double it on the way in to account for
820 * "struct sk_buff" etc. overhead. Applications
821 * assume that the SO_RCVBUF setting they make will
822 * allow that much actual data to be received on that
823 * socket.
824 *
825 * Applications are unaware that "struct sk_buff" and
826 * other overheads allocate from the receive buffer
827 * during socket buffer allocation.
828 *
829 * And after considering the possible alternatives,
830 * returning the value we actually used in getsockopt
831 * is the most desirable behavior.
832 */
833 WRITE_ONCE(sk->sk_rcvbuf,
834 max_t(int, val * 2, SOCK_MIN_RCVBUF));
835 break;
836
837 case SO_RCVBUFFORCE:
838 if (!capable(CAP_NET_ADMIN)) {
839 ret = -EPERM;
840 break;
841 }
842
843 /* No negative values (to prevent underflow, as val will be
844 * multiplied by 2).
845 */
846 if (val < 0)
847 val = 0;
848 goto set_rcvbuf;
849
850 case SO_KEEPALIVE:
851 if (sk->sk_prot->keepalive)
852 sk->sk_prot->keepalive(sk, valbool);
853 sock_valbool_flag(sk, SOCK_KEEPOPEN, valbool);
854 break;
855
856 case SO_OOBINLINE:
857 sock_valbool_flag(sk, SOCK_URGINLINE, valbool);
858 break;
859
860 case SO_NO_CHECK:
861 sk->sk_no_check_tx = valbool;
862 break;
863
864 case SO_PRIORITY:
865 if ((val >= 0 && val <= 6) ||
866 ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
867 sk->sk_priority = val;
868 else
869 ret = -EPERM;
870 break;
871
872 case SO_LINGER:
873 if (optlen < sizeof(ling)) {
874 ret = -EINVAL; /* 1003.1g */
875 break;
876 }
877 if (copy_from_user(&ling, optval, sizeof(ling))) {
878 ret = -EFAULT;
879 break;
880 }
881 if (!ling.l_onoff)
882 sock_reset_flag(sk, SOCK_LINGER);
883 else {
884 #if (BITS_PER_LONG == 32)
885 if ((unsigned int)ling.l_linger >= MAX_SCHEDULE_TIMEOUT/HZ)
886 sk->sk_lingertime = MAX_SCHEDULE_TIMEOUT;
887 else
888 #endif
889 sk->sk_lingertime = (unsigned int)ling.l_linger * HZ;
890 sock_set_flag(sk, SOCK_LINGER);
891 }
892 break;
893
894 case SO_BSDCOMPAT:
895 sock_warn_obsolete_bsdism("setsockopt");
896 break;
897
898 case SO_PASSCRED:
899 if (valbool)
900 set_bit(SOCK_PASSCRED, &sock->flags);
901 else
902 clear_bit(SOCK_PASSCRED, &sock->flags);
903 break;
904
905 case SO_TIMESTAMP_OLD:
906 case SO_TIMESTAMP_NEW:
907 case SO_TIMESTAMPNS_OLD:
908 case SO_TIMESTAMPNS_NEW:
909 if (valbool) {
910 if (optname == SO_TIMESTAMP_NEW || optname == SO_TIMESTAMPNS_NEW)
911 sock_set_flag(sk, SOCK_TSTAMP_NEW);
912 else
913 sock_reset_flag(sk, SOCK_TSTAMP_NEW);
914
915 if (optname == SO_TIMESTAMP_OLD || optname == SO_TIMESTAMP_NEW)
916 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
917 else
918 sock_set_flag(sk, SOCK_RCVTSTAMPNS);
919 sock_set_flag(sk, SOCK_RCVTSTAMP);
920 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
921 } else {
922 sock_reset_flag(sk, SOCK_RCVTSTAMP);
923 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
924 sock_reset_flag(sk, SOCK_TSTAMP_NEW);
925 }
926 break;
927
928 case SO_TIMESTAMPING_NEW:
929 sock_set_flag(sk, SOCK_TSTAMP_NEW);
930 /* fall through */
931 case SO_TIMESTAMPING_OLD:
932 if (val & ~SOF_TIMESTAMPING_MASK) {
933 ret = -EINVAL;
934 break;
935 }
936
937 if (val & SOF_TIMESTAMPING_OPT_ID &&
938 !(sk->sk_tsflags & SOF_TIMESTAMPING_OPT_ID)) {
939 if (sk->sk_protocol == IPPROTO_TCP &&
940 sk->sk_type == SOCK_STREAM) {
941 if ((1 << sk->sk_state) &
942 (TCPF_CLOSE | TCPF_LISTEN)) {
943 ret = -EINVAL;
944 break;
945 }
946 sk->sk_tskey = tcp_sk(sk)->snd_una;
947 } else {
948 sk->sk_tskey = 0;
949 }
950 }
951
952 if (val & SOF_TIMESTAMPING_OPT_STATS &&
953 !(val & SOF_TIMESTAMPING_OPT_TSONLY)) {
954 ret = -EINVAL;
955 break;
956 }
957
958 sk->sk_tsflags = val;
959 if (val & SOF_TIMESTAMPING_RX_SOFTWARE)
960 sock_enable_timestamp(sk,
961 SOCK_TIMESTAMPING_RX_SOFTWARE);
962 else {
963 if (optname == SO_TIMESTAMPING_NEW)
964 sock_reset_flag(sk, SOCK_TSTAMP_NEW);
965
966 sock_disable_timestamp(sk,
967 (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE));
968 }
969 break;
970
971 case SO_RCVLOWAT:
972 if (val < 0)
973 val = INT_MAX;
974 if (sock->ops->set_rcvlowat)
975 ret = sock->ops->set_rcvlowat(sk, val);
976 else
977 WRITE_ONCE(sk->sk_rcvlowat, val ? : 1);
978 break;
979
980 case SO_RCVTIMEO_OLD:
981 case SO_RCVTIMEO_NEW:
982 ret = sock_set_timeout(&sk->sk_rcvtimeo, optval, optlen, optname == SO_RCVTIMEO_OLD);
983 break;
984
985 case SO_SNDTIMEO_OLD:
986 case SO_SNDTIMEO_NEW:
987 ret = sock_set_timeout(&sk->sk_sndtimeo, optval, optlen, optname == SO_SNDTIMEO_OLD);
988 break;
989
990 case SO_ATTACH_FILTER:
991 ret = -EINVAL;
992 if (optlen == sizeof(struct sock_fprog)) {
993 struct sock_fprog fprog;
994
995 ret = -EFAULT;
996 if (copy_from_user(&fprog, optval, sizeof(fprog)))
997 break;
998
999 ret = sk_attach_filter(&fprog, sk);
1000 }
1001 break;
1002
1003 case SO_ATTACH_BPF:
1004 ret = -EINVAL;
1005 if (optlen == sizeof(u32)) {
1006 u32 ufd;
1007
1008 ret = -EFAULT;
1009 if (copy_from_user(&ufd, optval, sizeof(ufd)))
1010 break;
1011
1012 ret = sk_attach_bpf(ufd, sk);
1013 }
1014 break;
1015
1016 case SO_ATTACH_REUSEPORT_CBPF:
1017 ret = -EINVAL;
1018 if (optlen == sizeof(struct sock_fprog)) {
1019 struct sock_fprog fprog;
1020
1021 ret = -EFAULT;
1022 if (copy_from_user(&fprog, optval, sizeof(fprog)))
1023 break;
1024
1025 ret = sk_reuseport_attach_filter(&fprog, sk);
1026 }
1027 break;
1028
1029 case SO_ATTACH_REUSEPORT_EBPF:
1030 ret = -EINVAL;
1031 if (optlen == sizeof(u32)) {
1032 u32 ufd;
1033
1034 ret = -EFAULT;
1035 if (copy_from_user(&ufd, optval, sizeof(ufd)))
1036 break;
1037
1038 ret = sk_reuseport_attach_bpf(ufd, sk);
1039 }
1040 break;
1041
1042 case SO_DETACH_REUSEPORT_BPF:
1043 ret = reuseport_detach_prog(sk);
1044 break;
1045
1046 case SO_DETACH_FILTER:
1047 ret = sk_detach_filter(sk);
1048 break;
1049
1050 case SO_LOCK_FILTER:
1051 if (sock_flag(sk, SOCK_FILTER_LOCKED) && !valbool)
1052 ret = -EPERM;
1053 else
1054 sock_valbool_flag(sk, SOCK_FILTER_LOCKED, valbool);
1055 break;
1056
1057 case SO_PASSSEC:
1058 if (valbool)
1059 set_bit(SOCK_PASSSEC, &sock->flags);
1060 else
1061 clear_bit(SOCK_PASSSEC, &sock->flags);
1062 break;
1063 case SO_MARK:
1064 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) {
1065 ret = -EPERM;
1066 } else if (val != sk->sk_mark) {
1067 sk->sk_mark = val;
1068 sk_dst_reset(sk);
1069 }
1070 break;
1071
1072 case SO_RXQ_OVFL:
1073 sock_valbool_flag(sk, SOCK_RXQ_OVFL, valbool);
1074 break;
1075
1076 case SO_WIFI_STATUS:
1077 sock_valbool_flag(sk, SOCK_WIFI_STATUS, valbool);
1078 break;
1079
1080 case SO_PEEK_OFF:
1081 if (sock->ops->set_peek_off)
1082 ret = sock->ops->set_peek_off(sk, val);
1083 else
1084 ret = -EOPNOTSUPP;
1085 break;
1086
1087 case SO_NOFCS:
1088 sock_valbool_flag(sk, SOCK_NOFCS, valbool);
1089 break;
1090
1091 case SO_SELECT_ERR_QUEUE:
1092 sock_valbool_flag(sk, SOCK_SELECT_ERR_QUEUE, valbool);
1093 break;
1094
1095 #ifdef CONFIG_NET_RX_BUSY_POLL
1096 case SO_BUSY_POLL:
1097 /* allow unprivileged users to decrease the value */
1098 if ((val > sk->sk_ll_usec) && !capable(CAP_NET_ADMIN))
1099 ret = -EPERM;
1100 else {
1101 if (val < 0)
1102 ret = -EINVAL;
1103 else
1104 sk->sk_ll_usec = val;
1105 }
1106 break;
1107 #endif
1108
1109 case SO_MAX_PACING_RATE:
1110 {
1111 unsigned long ulval = (val == ~0U) ? ~0UL : val;
1112
1113 if (sizeof(ulval) != sizeof(val) &&
1114 optlen >= sizeof(ulval) &&
1115 get_user(ulval, (unsigned long __user *)optval)) {
1116 ret = -EFAULT;
1117 break;
1118 }
1119 if (ulval != ~0UL)
1120 cmpxchg(&sk->sk_pacing_status,
1121 SK_PACING_NONE,
1122 SK_PACING_NEEDED);
1123 sk->sk_max_pacing_rate = ulval;
1124 sk->sk_pacing_rate = min(sk->sk_pacing_rate, ulval);
1125 break;
1126 }
1127 case SO_INCOMING_CPU:
1128 WRITE_ONCE(sk->sk_incoming_cpu, val);
1129 break;
1130
1131 case SO_CNX_ADVICE:
1132 if (val == 1)
1133 dst_negative_advice(sk);
1134 break;
1135
1136 case SO_ZEROCOPY:
1137 if (sk->sk_family == PF_INET || sk->sk_family == PF_INET6) {
1138 if (!((sk->sk_type == SOCK_STREAM &&
1139 sk->sk_protocol == IPPROTO_TCP) ||
1140 (sk->sk_type == SOCK_DGRAM &&
1141 sk->sk_protocol == IPPROTO_UDP)))
1142 ret = -ENOTSUPP;
1143 } else if (sk->sk_family != PF_RDS) {
1144 ret = -ENOTSUPP;
1145 }
1146 if (!ret) {
1147 if (val < 0 || val > 1)
1148 ret = -EINVAL;
1149 else
1150 sock_valbool_flag(sk, SOCK_ZEROCOPY, valbool);
1151 }
1152 break;
1153
1154 case SO_TXTIME:
1155 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) {
1156 ret = -EPERM;
1157 } else if (optlen != sizeof(struct sock_txtime)) {
1158 ret = -EINVAL;
1159 } else if (copy_from_user(&sk_txtime, optval,
1160 sizeof(struct sock_txtime))) {
1161 ret = -EFAULT;
1162 } else if (sk_txtime.flags & ~SOF_TXTIME_FLAGS_MASK) {
1163 ret = -EINVAL;
1164 } else {
1165 sock_valbool_flag(sk, SOCK_TXTIME, true);
1166 sk->sk_clockid = sk_txtime.clockid;
1167 sk->sk_txtime_deadline_mode =
1168 !!(sk_txtime.flags & SOF_TXTIME_DEADLINE_MODE);
1169 sk->sk_txtime_report_errors =
1170 !!(sk_txtime.flags & SOF_TXTIME_REPORT_ERRORS);
1171 }
1172 break;
1173
1174 case SO_BINDTOIFINDEX:
1175 ret = sock_setbindtodevice_locked(sk, val);
1176 break;
1177
1178 default:
1179 ret = -ENOPROTOOPT;
1180 break;
1181 }
1182 release_sock(sk);
1183 return ret;
1184 }
1185 EXPORT_SYMBOL(sock_setsockopt);
1186
1187
1188 static void cred_to_ucred(struct pid *pid, const struct cred *cred,
1189 struct ucred *ucred)
1190 {
1191 ucred->pid = pid_vnr(pid);
1192 ucred->uid = ucred->gid = -1;
1193 if (cred) {
1194 struct user_namespace *current_ns = current_user_ns();
1195
1196 ucred->uid = from_kuid_munged(current_ns, cred->euid);
1197 ucred->gid = from_kgid_munged(current_ns, cred->egid);
1198 }
1199 }
1200
1201 static int groups_to_user(gid_t __user *dst, const struct group_info *src)
1202 {
1203 struct user_namespace *user_ns = current_user_ns();
1204 int i;
1205
1206 for (i = 0; i < src->ngroups; i++)
1207 if (put_user(from_kgid_munged(user_ns, src->gid[i]), dst + i))
1208 return -EFAULT;
1209
1210 return 0;
1211 }
1212
1213 int sock_getsockopt(struct socket *sock, int level, int optname,
1214 char __user *optval, int __user *optlen)
1215 {
1216 struct sock *sk = sock->sk;
1217
1218 union {
1219 int val;
1220 u64 val64;
1221 unsigned long ulval;
1222 struct linger ling;
1223 struct old_timeval32 tm32;
1224 struct __kernel_old_timeval tm;
1225 struct __kernel_sock_timeval stm;
1226 struct sock_txtime txtime;
1227 } v;
1228
1229 int lv = sizeof(int);
1230 int len;
1231
1232 if (get_user(len, optlen))
1233 return -EFAULT;
1234 if (len < 0)
1235 return -EINVAL;
1236
1237 memset(&v, 0, sizeof(v));
1238
1239 switch (optname) {
1240 case SO_DEBUG:
1241 v.val = sock_flag(sk, SOCK_DBG);
1242 break;
1243
1244 case SO_DONTROUTE:
1245 v.val = sock_flag(sk, SOCK_LOCALROUTE);
1246 break;
1247
1248 case SO_BROADCAST:
1249 v.val = sock_flag(sk, SOCK_BROADCAST);
1250 break;
1251
1252 case SO_SNDBUF:
1253 v.val = sk->sk_sndbuf;
1254 break;
1255
1256 case SO_RCVBUF:
1257 v.val = sk->sk_rcvbuf;
1258 break;
1259
1260 case SO_REUSEADDR:
1261 v.val = sk->sk_reuse;
1262 break;
1263
1264 case SO_REUSEPORT:
1265 v.val = sk->sk_reuseport;
1266 break;
1267
1268 case SO_KEEPALIVE:
1269 v.val = sock_flag(sk, SOCK_KEEPOPEN);
1270 break;
1271
1272 case SO_TYPE:
1273 v.val = sk->sk_type;
1274 break;
1275
1276 case SO_PROTOCOL:
1277 v.val = sk->sk_protocol;
1278 break;
1279
1280 case SO_DOMAIN:
1281 v.val = sk->sk_family;
1282 break;
1283
1284 case SO_ERROR:
1285 v.val = -sock_error(sk);
1286 if (v.val == 0)
1287 v.val = xchg(&sk->sk_err_soft, 0);
1288 break;
1289
1290 case SO_OOBINLINE:
1291 v.val = sock_flag(sk, SOCK_URGINLINE);
1292 break;
1293
1294 case SO_NO_CHECK:
1295 v.val = sk->sk_no_check_tx;
1296 break;
1297
1298 case SO_PRIORITY:
1299 v.val = sk->sk_priority;
1300 break;
1301
1302 case SO_LINGER:
1303 lv = sizeof(v.ling);
1304 v.ling.l_onoff = sock_flag(sk, SOCK_LINGER);
1305 v.ling.l_linger = sk->sk_lingertime / HZ;
1306 break;
1307
1308 case SO_BSDCOMPAT:
1309 sock_warn_obsolete_bsdism("getsockopt");
1310 break;
1311
1312 case SO_TIMESTAMP_OLD:
1313 v.val = sock_flag(sk, SOCK_RCVTSTAMP) &&
1314 !sock_flag(sk, SOCK_TSTAMP_NEW) &&
1315 !sock_flag(sk, SOCK_RCVTSTAMPNS);
1316 break;
1317
1318 case SO_TIMESTAMPNS_OLD:
1319 v.val = sock_flag(sk, SOCK_RCVTSTAMPNS) && !sock_flag(sk, SOCK_TSTAMP_NEW);
1320 break;
1321
1322 case SO_TIMESTAMP_NEW:
1323 v.val = sock_flag(sk, SOCK_RCVTSTAMP) && sock_flag(sk, SOCK_TSTAMP_NEW);
1324 break;
1325
1326 case SO_TIMESTAMPNS_NEW:
1327 v.val = sock_flag(sk, SOCK_RCVTSTAMPNS) && sock_flag(sk, SOCK_TSTAMP_NEW);
1328 break;
1329
1330 case SO_TIMESTAMPING_OLD:
1331 v.val = sk->sk_tsflags;
1332 break;
1333
1334 case SO_RCVTIMEO_OLD:
1335 case SO_RCVTIMEO_NEW:
1336 lv = sock_get_timeout(sk->sk_rcvtimeo, &v, SO_RCVTIMEO_OLD == optname);
1337 break;
1338
1339 case SO_SNDTIMEO_OLD:
1340 case SO_SNDTIMEO_NEW:
1341 lv = sock_get_timeout(sk->sk_sndtimeo, &v, SO_SNDTIMEO_OLD == optname);
1342 break;
1343
1344 case SO_RCVLOWAT:
1345 v.val = sk->sk_rcvlowat;
1346 break;
1347
1348 case SO_SNDLOWAT:
1349 v.val = 1;
1350 break;
1351
1352 case SO_PASSCRED:
1353 v.val = !!test_bit(SOCK_PASSCRED, &sock->flags);
1354 break;
1355
1356 case SO_PEERCRED:
1357 {
1358 struct ucred peercred;
1359 if (len > sizeof(peercred))
1360 len = sizeof(peercred);
1361 cred_to_ucred(sk->sk_peer_pid, sk->sk_peer_cred, &peercred);
1362 if (copy_to_user(optval, &peercred, len))
1363 return -EFAULT;
1364 goto lenout;
1365 }
1366
1367 case SO_PEERGROUPS:
1368 {
1369 int ret, n;
1370
1371 if (!sk->sk_peer_cred)
1372 return -ENODATA;
1373
1374 n = sk->sk_peer_cred->group_info->ngroups;
1375 if (len < n * sizeof(gid_t)) {
1376 len = n * sizeof(gid_t);
1377 return put_user(len, optlen) ? -EFAULT : -ERANGE;
1378 }
1379 len = n * sizeof(gid_t);
1380
1381 ret = groups_to_user((gid_t __user *)optval,
1382 sk->sk_peer_cred->group_info);
1383 if (ret)
1384 return ret;
1385 goto lenout;
1386 }
1387
1388 case SO_PEERNAME:
1389 {
1390 char address[128];
1391
1392 lv = sock->ops->getname(sock, (struct sockaddr *)address, 2);
1393 if (lv < 0)
1394 return -ENOTCONN;
1395 if (lv < len)
1396 return -EINVAL;
1397 if (copy_to_user(optval, address, len))
1398 return -EFAULT;
1399 goto lenout;
1400 }
1401
1402 /* Dubious BSD thing... Probably nobody even uses it, but
1403 * the UNIX standard wants it for whatever reason... -DaveM
1404 */
1405 case SO_ACCEPTCONN:
1406 v.val = sk->sk_state == TCP_LISTEN;
1407 break;
1408
1409 case SO_PASSSEC:
1410 v.val = !!test_bit(SOCK_PASSSEC, &sock->flags);
1411 break;
1412
1413 case SO_PEERSEC:
1414 return security_socket_getpeersec_stream(sock, optval, optlen, len);
1415
1416 case SO_MARK:
1417 v.val = sk->sk_mark;
1418 break;
1419
1420 case SO_RXQ_OVFL:
1421 v.val = sock_flag(sk, SOCK_RXQ_OVFL);
1422 break;
1423
1424 case SO_WIFI_STATUS:
1425 v.val = sock_flag(sk, SOCK_WIFI_STATUS);
1426 break;
1427
1428 case SO_PEEK_OFF:
1429 if (!sock->ops->set_peek_off)
1430 return -EOPNOTSUPP;
1431
1432 v.val = sk->sk_peek_off;
1433 break;
1434 case SO_NOFCS:
1435 v.val = sock_flag(sk, SOCK_NOFCS);
1436 break;
1437
1438 case SO_BINDTODEVICE:
1439 return sock_getbindtodevice(sk, optval, optlen, len);
1440
1441 case SO_GET_FILTER:
1442 len = sk_get_filter(sk, (struct sock_filter __user *)optval, len);
1443 if (len < 0)
1444 return len;
1445
1446 goto lenout;
1447
1448 case SO_LOCK_FILTER:
1449 v.val = sock_flag(sk, SOCK_FILTER_LOCKED);
1450 break;
1451
1452 case SO_BPF_EXTENSIONS:
1453 v.val = bpf_tell_extensions();
1454 break;
1455
1456 case SO_SELECT_ERR_QUEUE:
1457 v.val = sock_flag(sk, SOCK_SELECT_ERR_QUEUE);
1458 break;
1459
1460 #ifdef CONFIG_NET_RX_BUSY_POLL
1461 case SO_BUSY_POLL:
1462 v.val = sk->sk_ll_usec;
1463 break;
1464 #endif
1465
1466 case SO_MAX_PACING_RATE:
1467 if (sizeof(v.ulval) != sizeof(v.val) && len >= sizeof(v.ulval)) {
1468 lv = sizeof(v.ulval);
1469 v.ulval = sk->sk_max_pacing_rate;
1470 } else {
1471 /* 32bit version */
1472 v.val = min_t(unsigned long, sk->sk_max_pacing_rate, ~0U);
1473 }
1474 break;
1475
1476 case SO_INCOMING_CPU:
1477 v.val = READ_ONCE(sk->sk_incoming_cpu);
1478 break;
1479
1480 case SO_MEMINFO:
1481 {
1482 u32 meminfo[SK_MEMINFO_VARS];
1483
1484 sk_get_meminfo(sk, meminfo);
1485
1486 len = min_t(unsigned int, len, sizeof(meminfo));
1487 if (copy_to_user(optval, &meminfo, len))
1488 return -EFAULT;
1489
1490 goto lenout;
1491 }
1492
1493 #ifdef CONFIG_NET_RX_BUSY_POLL
1494 case SO_INCOMING_NAPI_ID:
1495 v.val = READ_ONCE(sk->sk_napi_id);
1496
1497 /* aggregate non-NAPI IDs down to 0 */
1498 if (v.val < MIN_NAPI_ID)
1499 v.val = 0;
1500
1501 break;
1502 #endif
1503
1504 case SO_COOKIE:
1505 lv = sizeof(u64);
1506 if (len < lv)
1507 return -EINVAL;
1508 v.val64 = sock_gen_cookie(sk);
1509 break;
1510
1511 case SO_ZEROCOPY:
1512 v.val = sock_flag(sk, SOCK_ZEROCOPY);
1513 break;
1514
1515 case SO_TXTIME:
1516 lv = sizeof(v.txtime);
1517 v.txtime.clockid = sk->sk_clockid;
1518 v.txtime.flags |= sk->sk_txtime_deadline_mode ?
1519 SOF_TXTIME_DEADLINE_MODE : 0;
1520 v.txtime.flags |= sk->sk_txtime_report_errors ?
1521 SOF_TXTIME_REPORT_ERRORS : 0;
1522 break;
1523
1524 case SO_BINDTOIFINDEX:
1525 v.val = sk->sk_bound_dev_if;
1526 break;
1527
1528 default:
1529 /* We implement the SO_SNDLOWAT etc to not be settable
1530 * (1003.1g 7).
1531 */
1532 return -ENOPROTOOPT;
1533 }
1534
1535 if (len > lv)
1536 len = lv;
1537 if (copy_to_user(optval, &v, len))
1538 return -EFAULT;
1539 lenout:
1540 if (put_user(len, optlen))
1541 return -EFAULT;
1542 return 0;
1543 }
1544
1545 /*
1546 * Initialize an sk_lock.
1547 *
1548 * (We also register the sk_lock with the lock validator.)
1549 */
1550 static inline void sock_lock_init(struct sock *sk)
1551 {
1552 if (sk->sk_kern_sock)
1553 sock_lock_init_class_and_name(
1554 sk,
1555 af_family_kern_slock_key_strings[sk->sk_family],
1556 af_family_kern_slock_keys + sk->sk_family,
1557 af_family_kern_key_strings[sk->sk_family],
1558 af_family_kern_keys + sk->sk_family);
1559 else
1560 sock_lock_init_class_and_name(
1561 sk,
1562 af_family_slock_key_strings[sk->sk_family],
1563 af_family_slock_keys + sk->sk_family,
1564 af_family_key_strings[sk->sk_family],
1565 af_family_keys + sk->sk_family);
1566 }
1567
1568 /*
1569 * Copy all fields from osk to nsk but nsk->sk_refcnt must not change yet,
1570 * even temporarly, because of RCU lookups. sk_node should also be left as is.
1571 * We must not copy fields between sk_dontcopy_begin and sk_dontcopy_end
1572 */
1573 static void sock_copy(struct sock *nsk, const struct sock *osk)
1574 {
1575 const struct proto *prot = READ_ONCE(osk->sk_prot);
1576 #ifdef CONFIG_SECURITY_NETWORK
1577 void *sptr = nsk->sk_security;
1578 #endif
1579 memcpy(nsk, osk, offsetof(struct sock, sk_dontcopy_begin));
1580
1581 memcpy(&nsk->sk_dontcopy_end, &osk->sk_dontcopy_end,
1582 prot->obj_size - offsetof(struct sock, sk_dontcopy_end));
1583
1584 #ifdef CONFIG_SECURITY_NETWORK
1585 nsk->sk_security = sptr;
1586 security_sk_clone(osk, nsk);
1587 #endif
1588 }
1589
1590 static struct sock *sk_prot_alloc(struct proto *prot, gfp_t priority,
1591 int family)
1592 {
1593 struct sock *sk;
1594 struct kmem_cache *slab;
1595
1596 slab = prot->slab;
1597 if (slab != NULL) {
1598 sk = kmem_cache_alloc(slab, priority & ~__GFP_ZERO);
1599 if (!sk)
1600 return sk;
1601 if (want_init_on_alloc(priority))
1602 sk_prot_clear_nulls(sk, prot->obj_size);
1603 } else
1604 sk = kmalloc(prot->obj_size, priority);
1605
1606 if (sk != NULL) {
1607 if (security_sk_alloc(sk, family, priority))
1608 goto out_free;
1609
1610 if (!try_module_get(prot->owner))
1611 goto out_free_sec;
1612 sk_tx_queue_clear(sk);
1613 }
1614
1615 return sk;
1616
1617 out_free_sec:
1618 security_sk_free(sk);
1619 out_free:
1620 if (slab != NULL)
1621 kmem_cache_free(slab, sk);
1622 else
1623 kfree(sk);
1624 return NULL;
1625 }
1626
1627 static void sk_prot_free(struct proto *prot, struct sock *sk)
1628 {
1629 struct kmem_cache *slab;
1630 struct module *owner;
1631
1632 owner = prot->owner;
1633 slab = prot->slab;
1634
1635 cgroup_sk_free(&sk->sk_cgrp_data);
1636 mem_cgroup_sk_free(sk);
1637 security_sk_free(sk);
1638 if (slab != NULL)
1639 kmem_cache_free(slab, sk);
1640 else
1641 kfree(sk);
1642 module_put(owner);
1643 }
1644
1645 /**
1646 * sk_alloc - All socket objects are allocated here
1647 * @net: the applicable net namespace
1648 * @family: protocol family
1649 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
1650 * @prot: struct proto associated with this new sock instance
1651 * @kern: is this to be a kernel socket?
1652 */
1653 struct sock *sk_alloc(struct net *net, int family, gfp_t priority,
1654 struct proto *prot, int kern)
1655 {
1656 struct sock *sk;
1657
1658 sk = sk_prot_alloc(prot, priority | __GFP_ZERO, family);
1659 if (sk) {
1660 sk->sk_family = family;
1661 /*
1662 * See comment in struct sock definition to understand
1663 * why we need sk_prot_creator -acme
1664 */
1665 sk->sk_prot = sk->sk_prot_creator = prot;
1666 sk->sk_kern_sock = kern;
1667 sock_lock_init(sk);
1668 sk->sk_net_refcnt = kern ? 0 : 1;
1669 if (likely(sk->sk_net_refcnt)) {
1670 get_net(net);
1671 sock_inuse_add(net, 1);
1672 }
1673
1674 sock_net_set(sk, net);
1675 refcount_set(&sk->sk_wmem_alloc, 1);
1676
1677 mem_cgroup_sk_alloc(sk);
1678 cgroup_sk_alloc(&sk->sk_cgrp_data);
1679 sock_update_classid(&sk->sk_cgrp_data);
1680 sock_update_netprioidx(&sk->sk_cgrp_data);
1681 }
1682
1683 return sk;
1684 }
1685 EXPORT_SYMBOL(sk_alloc);
1686
1687 /* Sockets having SOCK_RCU_FREE will call this function after one RCU
1688 * grace period. This is the case for UDP sockets and TCP listeners.
1689 */
1690 static void __sk_destruct(struct rcu_head *head)
1691 {
1692 struct sock *sk = container_of(head, struct sock, sk_rcu);
1693 struct sk_filter *filter;
1694
1695 if (sk->sk_destruct)
1696 sk->sk_destruct(sk);
1697
1698 filter = rcu_dereference_check(sk->sk_filter,
1699 refcount_read(&sk->sk_wmem_alloc) == 0);
1700 if (filter) {
1701 sk_filter_uncharge(sk, filter);
1702 RCU_INIT_POINTER(sk->sk_filter, NULL);
1703 }
1704
1705 sock_disable_timestamp(sk, SK_FLAGS_TIMESTAMP);
1706
1707 #ifdef CONFIG_BPF_SYSCALL
1708 bpf_sk_storage_free(sk);
1709 #endif
1710
1711 if (atomic_read(&sk->sk_omem_alloc))
1712 pr_debug("%s: optmem leakage (%d bytes) detected\n",
1713 __func__, atomic_read(&sk->sk_omem_alloc));
1714
1715 if (sk->sk_frag.page) {
1716 put_page(sk->sk_frag.page);
1717 sk->sk_frag.page = NULL;
1718 }
1719
1720 if (sk->sk_peer_cred)
1721 put_cred(sk->sk_peer_cred);
1722 put_pid(sk->sk_peer_pid);
1723 if (likely(sk->sk_net_refcnt))
1724 put_net(sock_net(sk));
1725 sk_prot_free(sk->sk_prot_creator, sk);
1726 }
1727
1728 void sk_destruct(struct sock *sk)
1729 {
1730 bool use_call_rcu = sock_flag(sk, SOCK_RCU_FREE);
1731
1732 if (rcu_access_pointer(sk->sk_reuseport_cb)) {
1733 reuseport_detach_sock(sk);
1734 use_call_rcu = true;
1735 }
1736
1737 if (use_call_rcu)
1738 call_rcu(&sk->sk_rcu, __sk_destruct);
1739 else
1740 __sk_destruct(&sk->sk_rcu);
1741 }
1742
1743 static void __sk_free(struct sock *sk)
1744 {
1745 if (likely(sk->sk_net_refcnt))
1746 sock_inuse_add(sock_net(sk), -1);
1747
1748 if (unlikely(sk->sk_net_refcnt && sock_diag_has_destroy_listeners(sk)))
1749 sock_diag_broadcast_destroy(sk);
1750 else
1751 sk_destruct(sk);
1752 }
1753
1754 void sk_free(struct sock *sk)
1755 {
1756 /*
1757 * We subtract one from sk_wmem_alloc and can know if
1758 * some packets are still in some tx queue.
1759 * If not null, sock_wfree() will call __sk_free(sk) later
1760 */
1761 if (refcount_dec_and_test(&sk->sk_wmem_alloc))
1762 __sk_free(sk);
1763 }
1764 EXPORT_SYMBOL(sk_free);
1765
1766 static void sk_init_common(struct sock *sk)
1767 {
1768 skb_queue_head_init(&sk->sk_receive_queue);
1769 skb_queue_head_init(&sk->sk_write_queue);
1770 skb_queue_head_init(&sk->sk_error_queue);
1771
1772 rwlock_init(&sk->sk_callback_lock);
1773 lockdep_set_class_and_name(&sk->sk_receive_queue.lock,
1774 af_rlock_keys + sk->sk_family,
1775 af_family_rlock_key_strings[sk->sk_family]);
1776 lockdep_set_class_and_name(&sk->sk_write_queue.lock,
1777 af_wlock_keys + sk->sk_family,
1778 af_family_wlock_key_strings[sk->sk_family]);
1779 lockdep_set_class_and_name(&sk->sk_error_queue.lock,
1780 af_elock_keys + sk->sk_family,
1781 af_family_elock_key_strings[sk->sk_family]);
1782 lockdep_set_class_and_name(&sk->sk_callback_lock,
1783 af_callback_keys + sk->sk_family,
1784 af_family_clock_key_strings[sk->sk_family]);
1785 }
1786
1787 /**
1788 * sk_clone_lock - clone a socket, and lock its clone
1789 * @sk: the socket to clone
1790 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
1791 *
1792 * Caller must unlock socket even in error path (bh_unlock_sock(newsk))
1793 */
1794 struct sock *sk_clone_lock(const struct sock *sk, const gfp_t priority)
1795 {
1796 struct proto *prot = READ_ONCE(sk->sk_prot);
1797 struct sock *newsk;
1798 bool is_charged = true;
1799
1800 newsk = sk_prot_alloc(prot, priority, sk->sk_family);
1801 if (newsk != NULL) {
1802 struct sk_filter *filter;
1803
1804 sock_copy(newsk, sk);
1805
1806 newsk->sk_prot_creator = prot;
1807
1808 /* SANITY */
1809 if (likely(newsk->sk_net_refcnt))
1810 get_net(sock_net(newsk));
1811 sk_node_init(&newsk->sk_node);
1812 sock_lock_init(newsk);
1813 bh_lock_sock(newsk);
1814 newsk->sk_backlog.head = newsk->sk_backlog.tail = NULL;
1815 newsk->sk_backlog.len = 0;
1816
1817 atomic_set(&newsk->sk_rmem_alloc, 0);
1818 /*
1819 * sk_wmem_alloc set to one (see sk_free() and sock_wfree())
1820 */
1821 refcount_set(&newsk->sk_wmem_alloc, 1);
1822 atomic_set(&newsk->sk_omem_alloc, 0);
1823 sk_init_common(newsk);
1824
1825 newsk->sk_dst_cache = NULL;
1826 newsk->sk_dst_pending_confirm = 0;
1827 newsk->sk_wmem_queued = 0;
1828 newsk->sk_forward_alloc = 0;
1829 atomic_set(&newsk->sk_drops, 0);
1830 newsk->sk_send_head = NULL;
1831 newsk->sk_userlocks = sk->sk_userlocks & ~SOCK_BINDPORT_LOCK;
1832 atomic_set(&newsk->sk_zckey, 0);
1833
1834 sock_reset_flag(newsk, SOCK_DONE);
1835
1836 /* sk->sk_memcg will be populated at accept() time */
1837 newsk->sk_memcg = NULL;
1838
1839 cgroup_sk_alloc(&newsk->sk_cgrp_data);
1840
1841 rcu_read_lock();
1842 filter = rcu_dereference(sk->sk_filter);
1843 if (filter != NULL)
1844 /* though it's an empty new sock, the charging may fail
1845 * if sysctl_optmem_max was changed between creation of
1846 * original socket and cloning
1847 */
1848 is_charged = sk_filter_charge(newsk, filter);
1849 RCU_INIT_POINTER(newsk->sk_filter, filter);
1850 rcu_read_unlock();
1851
1852 if (unlikely(!is_charged || xfrm_sk_clone_policy(newsk, sk))) {
1853 /* We need to make sure that we don't uncharge the new
1854 * socket if we couldn't charge it in the first place
1855 * as otherwise we uncharge the parent's filter.
1856 */
1857 if (!is_charged)
1858 RCU_INIT_POINTER(newsk->sk_filter, NULL);
1859 sk_free_unlock_clone(newsk);
1860 newsk = NULL;
1861 goto out;
1862 }
1863 RCU_INIT_POINTER(newsk->sk_reuseport_cb, NULL);
1864
1865 if (bpf_sk_storage_clone(sk, newsk)) {
1866 sk_free_unlock_clone(newsk);
1867 newsk = NULL;
1868 goto out;
1869 }
1870
1871 /* Clear sk_user_data if parent had the pointer tagged
1872 * as not suitable for copying when cloning.
1873 */
1874 if (sk_user_data_is_nocopy(newsk))
1875 newsk->sk_user_data = NULL;
1876
1877 newsk->sk_err = 0;
1878 newsk->sk_err_soft = 0;
1879 newsk->sk_priority = 0;
1880 newsk->sk_incoming_cpu = raw_smp_processor_id();
1881 if (likely(newsk->sk_net_refcnt))
1882 sock_inuse_add(sock_net(newsk), 1);
1883
1884 /*
1885 * Before updating sk_refcnt, we must commit prior changes to memory
1886 * (Documentation/RCU/rculist_nulls.txt for details)
1887 */
1888 smp_wmb();
1889 refcount_set(&newsk->sk_refcnt, 2);
1890
1891 /*
1892 * Increment the counter in the same struct proto as the master
1893 * sock (sk_refcnt_debug_inc uses newsk->sk_prot->socks, that
1894 * is the same as sk->sk_prot->socks, as this field was copied
1895 * with memcpy).
1896 *
1897 * This _changes_ the previous behaviour, where
1898 * tcp_create_openreq_child always was incrementing the
1899 * equivalent to tcp_prot->socks (inet_sock_nr), so this have
1900 * to be taken into account in all callers. -acme
1901 */
1902 sk_refcnt_debug_inc(newsk);
1903 sk_set_socket(newsk, NULL);
1904 RCU_INIT_POINTER(newsk->sk_wq, NULL);
1905
1906 if (newsk->sk_prot->sockets_allocated)
1907 sk_sockets_allocated_inc(newsk);
1908
1909 if (sock_needs_netstamp(sk) &&
1910 newsk->sk_flags & SK_FLAGS_TIMESTAMP)
1911 net_enable_timestamp();
1912 }
1913 out:
1914 return newsk;
1915 }
1916 EXPORT_SYMBOL_GPL(sk_clone_lock);
1917
1918 void sk_free_unlock_clone(struct sock *sk)
1919 {
1920 /* It is still raw copy of parent, so invalidate
1921 * destructor and make plain sk_free() */
1922 sk->sk_destruct = NULL;
1923 bh_unlock_sock(sk);
1924 sk_free(sk);
1925 }
1926 EXPORT_SYMBOL_GPL(sk_free_unlock_clone);
1927
1928 void sk_setup_caps(struct sock *sk, struct dst_entry *dst)
1929 {
1930 u32 max_segs = 1;
1931
1932 sk_dst_set(sk, dst);
1933 sk->sk_route_caps = dst->dev->features | sk->sk_route_forced_caps;
1934 if (sk->sk_route_caps & NETIF_F_GSO)
1935 sk->sk_route_caps |= NETIF_F_GSO_SOFTWARE;
1936 sk->sk_route_caps &= ~sk->sk_route_nocaps;
1937 if (sk_can_gso(sk)) {
1938 if (dst->header_len && !xfrm_dst_offload_ok(dst)) {
1939 sk->sk_route_caps &= ~NETIF_F_GSO_MASK;
1940 } else {
1941 sk->sk_route_caps |= NETIF_F_SG | NETIF_F_HW_CSUM;
1942 sk->sk_gso_max_size = dst->dev->gso_max_size;
1943 max_segs = max_t(u32, dst->dev->gso_max_segs, 1);
1944 }
1945 }
1946 sk->sk_gso_max_segs = max_segs;
1947 }
1948 EXPORT_SYMBOL_GPL(sk_setup_caps);
1949
1950 /*
1951 * Simple resource managers for sockets.
1952 */
1953
1954
1955 /*
1956 * Write buffer destructor automatically called from kfree_skb.
1957 */
1958 void sock_wfree(struct sk_buff *skb)
1959 {
1960 struct sock *sk = skb->sk;
1961 unsigned int len = skb->truesize;
1962
1963 if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE)) {
1964 /*
1965 * Keep a reference on sk_wmem_alloc, this will be released
1966 * after sk_write_space() call
1967 */
1968 WARN_ON(refcount_sub_and_test(len - 1, &sk->sk_wmem_alloc));
1969 sk->sk_write_space(sk);
1970 len = 1;
1971 }
1972 /*
1973 * if sk_wmem_alloc reaches 0, we must finish what sk_free()
1974 * could not do because of in-flight packets
1975 */
1976 if (refcount_sub_and_test(len, &sk->sk_wmem_alloc))
1977 __sk_free(sk);
1978 }
1979 EXPORT_SYMBOL(sock_wfree);
1980
1981 /* This variant of sock_wfree() is used by TCP,
1982 * since it sets SOCK_USE_WRITE_QUEUE.
1983 */
1984 void __sock_wfree(struct sk_buff *skb)
1985 {
1986 struct sock *sk = skb->sk;
1987
1988 if (refcount_sub_and_test(skb->truesize, &sk->sk_wmem_alloc))
1989 __sk_free(sk);
1990 }
1991
1992 void skb_set_owner_w(struct sk_buff *skb, struct sock *sk)
1993 {
1994 skb_orphan(skb);
1995 skb->sk = sk;
1996 #ifdef CONFIG_INET
1997 if (unlikely(!sk_fullsock(sk))) {
1998 skb->destructor = sock_edemux;
1999 sock_hold(sk);
2000 return;
2001 }
2002 #endif
2003 skb->destructor = sock_wfree;
2004 skb_set_hash_from_sk(skb, sk);
2005 /*
2006 * We used to take a refcount on sk, but following operation
2007 * is enough to guarantee sk_free() wont free this sock until
2008 * all in-flight packets are completed
2009 */
2010 refcount_add(skb->truesize, &sk->sk_wmem_alloc);
2011 }
2012 EXPORT_SYMBOL(skb_set_owner_w);
2013
2014 static bool can_skb_orphan_partial(const struct sk_buff *skb)
2015 {
2016 #ifdef CONFIG_TLS_DEVICE
2017 /* Drivers depend on in-order delivery for crypto offload,
2018 * partial orphan breaks out-of-order-OK logic.
2019 */
2020 if (skb->decrypted)
2021 return false;
2022 #endif
2023 return (skb->destructor == sock_wfree ||
2024 (IS_ENABLED(CONFIG_INET) && skb->destructor == tcp_wfree));
2025 }
2026
2027 /* This helper is used by netem, as it can hold packets in its
2028 * delay queue. We want to allow the owner socket to send more
2029 * packets, as if they were already TX completed by a typical driver.
2030 * But we also want to keep skb->sk set because some packet schedulers
2031 * rely on it (sch_fq for example).
2032 */
2033 void skb_orphan_partial(struct sk_buff *skb)
2034 {
2035 if (skb_is_tcp_pure_ack(skb))
2036 return;
2037
2038 if (can_skb_orphan_partial(skb)) {
2039 struct sock *sk = skb->sk;
2040
2041 if (refcount_inc_not_zero(&sk->sk_refcnt)) {
2042 WARN_ON(refcount_sub_and_test(skb->truesize, &sk->sk_wmem_alloc));
2043 skb->destructor = sock_efree;
2044 }
2045 } else {
2046 skb_orphan(skb);
2047 }
2048 }
2049 EXPORT_SYMBOL(skb_orphan_partial);
2050
2051 /*
2052 * Read buffer destructor automatically called from kfree_skb.
2053 */
2054 void sock_rfree(struct sk_buff *skb)
2055 {
2056 struct sock *sk = skb->sk;
2057 unsigned int len = skb->truesize;
2058
2059 atomic_sub(len, &sk->sk_rmem_alloc);
2060 sk_mem_uncharge(sk, len);
2061 }
2062 EXPORT_SYMBOL(sock_rfree);
2063
2064 /*
2065 * Buffer destructor for skbs that are not used directly in read or write
2066 * path, e.g. for error handler skbs. Automatically called from kfree_skb.
2067 */
2068 void sock_efree(struct sk_buff *skb)
2069 {
2070 sock_put(skb->sk);
2071 }
2072 EXPORT_SYMBOL(sock_efree);
2073
2074 /* Buffer destructor for prefetch/receive path where reference count may
2075 * not be held, e.g. for listen sockets.
2076 */
2077 #ifdef CONFIG_INET
2078 void sock_pfree(struct sk_buff *skb)
2079 {
2080 if (sk_is_refcounted(skb->sk))
2081 sock_gen_put(skb->sk);
2082 }
2083 EXPORT_SYMBOL(sock_pfree);
2084 #endif /* CONFIG_INET */
2085
2086 kuid_t sock_i_uid(struct sock *sk)
2087 {
2088 kuid_t uid;
2089
2090 read_lock_bh(&sk->sk_callback_lock);
2091 uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : GLOBAL_ROOT_UID;
2092 read_unlock_bh(&sk->sk_callback_lock);
2093 return uid;
2094 }
2095 EXPORT_SYMBOL(sock_i_uid);
2096
2097 unsigned long sock_i_ino(struct sock *sk)
2098 {
2099 unsigned long ino;
2100
2101 read_lock_bh(&sk->sk_callback_lock);
2102 ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0;
2103 read_unlock_bh(&sk->sk_callback_lock);
2104 return ino;
2105 }
2106 EXPORT_SYMBOL(sock_i_ino);
2107
2108 /*
2109 * Allocate a skb from the socket's send buffer.
2110 */
2111 struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force,
2112 gfp_t priority)
2113 {
2114 if (force ||
2115 refcount_read(&sk->sk_wmem_alloc) < READ_ONCE(sk->sk_sndbuf)) {
2116 struct sk_buff *skb = alloc_skb(size, priority);
2117
2118 if (skb) {
2119 skb_set_owner_w(skb, sk);
2120 return skb;
2121 }
2122 }
2123 return NULL;
2124 }
2125 EXPORT_SYMBOL(sock_wmalloc);
2126
2127 static void sock_ofree(struct sk_buff *skb)
2128 {
2129 struct sock *sk = skb->sk;
2130
2131 atomic_sub(skb->truesize, &sk->sk_omem_alloc);
2132 }
2133
2134 struct sk_buff *sock_omalloc(struct sock *sk, unsigned long size,
2135 gfp_t priority)
2136 {
2137 struct sk_buff *skb;
2138
2139 /* small safe race: SKB_TRUESIZE may differ from final skb->truesize */
2140 if (atomic_read(&sk->sk_omem_alloc) + SKB_TRUESIZE(size) >
2141 sysctl_optmem_max)
2142 return NULL;
2143
2144 skb = alloc_skb(size, priority);
2145 if (!skb)
2146 return NULL;
2147
2148 atomic_add(skb->truesize, &sk->sk_omem_alloc);
2149 skb->sk = sk;
2150 skb->destructor = sock_ofree;
2151 return skb;
2152 }
2153
2154 /*
2155 * Allocate a memory block from the socket's option memory buffer.
2156 */
2157 void *sock_kmalloc(struct sock *sk, int size, gfp_t priority)
2158 {
2159 if ((unsigned int)size <= sysctl_optmem_max &&
2160 atomic_read(&sk->sk_omem_alloc) + size < sysctl_optmem_max) {
2161 void *mem;
2162 /* First do the add, to avoid the race if kmalloc
2163 * might sleep.
2164 */
2165 atomic_add(size, &sk->sk_omem_alloc);
2166 mem = kmalloc(size, priority);
2167 if (mem)
2168 return mem;
2169 atomic_sub(size, &sk->sk_omem_alloc);
2170 }
2171 return NULL;
2172 }
2173 EXPORT_SYMBOL(sock_kmalloc);
2174
2175 /* Free an option memory block. Note, we actually want the inline
2176 * here as this allows gcc to detect the nullify and fold away the
2177 * condition entirely.
2178 */
2179 static inline void __sock_kfree_s(struct sock *sk, void *mem, int size,
2180 const bool nullify)
2181 {
2182 if (WARN_ON_ONCE(!mem))
2183 return;
2184 if (nullify)
2185 kzfree(mem);
2186 else
2187 kfree(mem);
2188 atomic_sub(size, &sk->sk_omem_alloc);
2189 }
2190
2191 void sock_kfree_s(struct sock *sk, void *mem, int size)
2192 {
2193 __sock_kfree_s(sk, mem, size, false);
2194 }
2195 EXPORT_SYMBOL(sock_kfree_s);
2196
2197 void sock_kzfree_s(struct sock *sk, void *mem, int size)
2198 {
2199 __sock_kfree_s(sk, mem, size, true);
2200 }
2201 EXPORT_SYMBOL(sock_kzfree_s);
2202
2203 /* It is almost wait_for_tcp_memory minus release_sock/lock_sock.
2204 I think, these locks should be removed for datagram sockets.
2205 */
2206 static long sock_wait_for_wmem(struct sock *sk, long timeo)
2207 {
2208 DEFINE_WAIT(wait);
2209
2210 sk_clear_bit(SOCKWQ_ASYNC_NOSPACE, sk);
2211 for (;;) {
2212 if (!timeo)
2213 break;
2214 if (signal_pending(current))
2215 break;
2216 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
2217 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
2218 if (refcount_read(&sk->sk_wmem_alloc) < READ_ONCE(sk->sk_sndbuf))
2219 break;
2220 if (sk->sk_shutdown & SEND_SHUTDOWN)
2221 break;
2222 if (sk->sk_err)
2223 break;
2224 timeo = schedule_timeout(timeo);
2225 }
2226 finish_wait(sk_sleep(sk), &wait);
2227 return timeo;
2228 }
2229
2230
2231 /*
2232 * Generic send/receive buffer handlers
2233 */
2234
2235 struct sk_buff *sock_alloc_send_pskb(struct sock *sk, unsigned long header_len,
2236 unsigned long data_len, int noblock,
2237 int *errcode, int max_page_order)
2238 {
2239 struct sk_buff *skb;
2240 long timeo;
2241 int err;
2242
2243 timeo = sock_sndtimeo(sk, noblock);
2244 for (;;) {
2245 err = sock_error(sk);
2246 if (err != 0)
2247 goto failure;
2248
2249 err = -EPIPE;
2250 if (sk->sk_shutdown & SEND_SHUTDOWN)
2251 goto failure;
2252
2253 if (sk_wmem_alloc_get(sk) < READ_ONCE(sk->sk_sndbuf))
2254 break;
2255
2256 sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk);
2257 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
2258 err = -EAGAIN;
2259 if (!timeo)
2260 goto failure;
2261 if (signal_pending(current))
2262 goto interrupted;
2263 timeo = sock_wait_for_wmem(sk, timeo);
2264 }
2265 skb = alloc_skb_with_frags(header_len, data_len, max_page_order,
2266 errcode, sk->sk_allocation);
2267 if (skb)
2268 skb_set_owner_w(skb, sk);
2269 return skb;
2270
2271 interrupted:
2272 err = sock_intr_errno(timeo);
2273 failure:
2274 *errcode = err;
2275 return NULL;
2276 }
2277 EXPORT_SYMBOL(sock_alloc_send_pskb);
2278
2279 struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size,
2280 int noblock, int *errcode)
2281 {
2282 return sock_alloc_send_pskb(sk, size, 0, noblock, errcode, 0);
2283 }
2284 EXPORT_SYMBOL(sock_alloc_send_skb);
2285
2286 int __sock_cmsg_send(struct sock *sk, struct msghdr *msg, struct cmsghdr *cmsg,
2287 struct sockcm_cookie *sockc)
2288 {
2289 u32 tsflags;
2290
2291 switch (cmsg->cmsg_type) {
2292 case SO_MARK:
2293 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
2294 return -EPERM;
2295 if (cmsg->cmsg_len != CMSG_LEN(sizeof(u32)))
2296 return -EINVAL;
2297 sockc->mark = *(u32 *)CMSG_DATA(cmsg);
2298 break;
2299 case SO_TIMESTAMPING_OLD:
2300 if (cmsg->cmsg_len != CMSG_LEN(sizeof(u32)))
2301 return -EINVAL;
2302
2303 tsflags = *(u32 *)CMSG_DATA(cmsg);
2304 if (tsflags & ~SOF_TIMESTAMPING_TX_RECORD_MASK)
2305 return -EINVAL;
2306
2307 sockc->tsflags &= ~SOF_TIMESTAMPING_TX_RECORD_MASK;
2308 sockc->tsflags |= tsflags;
2309 break;
2310 case SCM_TXTIME:
2311 if (!sock_flag(sk, SOCK_TXTIME))
2312 return -EINVAL;
2313 if (cmsg->cmsg_len != CMSG_LEN(sizeof(u64)))
2314 return -EINVAL;
2315 sockc->transmit_time = get_unaligned((u64 *)CMSG_DATA(cmsg));
2316 break;
2317 /* SCM_RIGHTS and SCM_CREDENTIALS are semantically in SOL_UNIX. */
2318 case SCM_RIGHTS:
2319 case SCM_CREDENTIALS:
2320 break;
2321 default:
2322 return -EINVAL;
2323 }
2324 return 0;
2325 }
2326 EXPORT_SYMBOL(__sock_cmsg_send);
2327
2328 int sock_cmsg_send(struct sock *sk, struct msghdr *msg,
2329 struct sockcm_cookie *sockc)
2330 {
2331 struct cmsghdr *cmsg;
2332 int ret;
2333
2334 for_each_cmsghdr(cmsg, msg) {
2335 if (!CMSG_OK(msg, cmsg))
2336 return -EINVAL;
2337 if (cmsg->cmsg_level != SOL_SOCKET)
2338 continue;
2339 ret = __sock_cmsg_send(sk, msg, cmsg, sockc);
2340 if (ret)
2341 return ret;
2342 }
2343 return 0;
2344 }
2345 EXPORT_SYMBOL(sock_cmsg_send);
2346
2347 static void sk_enter_memory_pressure(struct sock *sk)
2348 {
2349 if (!sk->sk_prot->enter_memory_pressure)
2350 return;
2351
2352 sk->sk_prot->enter_memory_pressure(sk);
2353 }
2354
2355 static void sk_leave_memory_pressure(struct sock *sk)
2356 {
2357 if (sk->sk_prot->leave_memory_pressure) {
2358 sk->sk_prot->leave_memory_pressure(sk);
2359 } else {
2360 unsigned long *memory_pressure = sk->sk_prot->memory_pressure;
2361
2362 if (memory_pressure && READ_ONCE(*memory_pressure))
2363 WRITE_ONCE(*memory_pressure, 0);
2364 }
2365 }
2366
2367 #define SKB_FRAG_PAGE_ORDER get_order(32768)
2368 DEFINE_STATIC_KEY_FALSE(net_high_order_alloc_disable_key);
2369
2370 /**
2371 * skb_page_frag_refill - check that a page_frag contains enough room
2372 * @sz: minimum size of the fragment we want to get
2373 * @pfrag: pointer to page_frag
2374 * @gfp: priority for memory allocation
2375 *
2376 * Note: While this allocator tries to use high order pages, there is
2377 * no guarantee that allocations succeed. Therefore, @sz MUST be
2378 * less or equal than PAGE_SIZE.
2379 */
2380 bool skb_page_frag_refill(unsigned int sz, struct page_frag *pfrag, gfp_t gfp)
2381 {
2382 if (pfrag->page) {
2383 if (page_ref_count(pfrag->page) == 1) {
2384 pfrag->offset = 0;
2385 return true;
2386 }
2387 if (pfrag->offset + sz <= pfrag->size)
2388 return true;
2389 put_page(pfrag->page);
2390 }
2391
2392 pfrag->offset = 0;
2393 if (SKB_FRAG_PAGE_ORDER &&
2394 !static_branch_unlikely(&net_high_order_alloc_disable_key)) {
2395 /* Avoid direct reclaim but allow kswapd to wake */
2396 pfrag->page = alloc_pages((gfp & ~__GFP_DIRECT_RECLAIM) |
2397 __GFP_COMP | __GFP_NOWARN |
2398 __GFP_NORETRY,
2399 SKB_FRAG_PAGE_ORDER);
2400 if (likely(pfrag->page)) {
2401 pfrag->size = PAGE_SIZE << SKB_FRAG_PAGE_ORDER;
2402 return true;
2403 }
2404 }
2405 pfrag->page = alloc_page(gfp);
2406 if (likely(pfrag->page)) {
2407 pfrag->size = PAGE_SIZE;
2408 return true;
2409 }
2410 return false;
2411 }
2412 EXPORT_SYMBOL(skb_page_frag_refill);
2413
2414 bool sk_page_frag_refill(struct sock *sk, struct page_frag *pfrag)
2415 {
2416 if (likely(skb_page_frag_refill(32U, pfrag, sk->sk_allocation)))
2417 return true;
2418
2419 sk_enter_memory_pressure(sk);
2420 sk_stream_moderate_sndbuf(sk);
2421 return false;
2422 }
2423 EXPORT_SYMBOL(sk_page_frag_refill);
2424
2425 static void __lock_sock(struct sock *sk)
2426 __releases(&sk->sk_lock.slock)
2427 __acquires(&sk->sk_lock.slock)
2428 {
2429 DEFINE_WAIT(wait);
2430
2431 for (;;) {
2432 prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait,
2433 TASK_UNINTERRUPTIBLE);
2434 spin_unlock_bh(&sk->sk_lock.slock);
2435 schedule();
2436 spin_lock_bh(&sk->sk_lock.slock);
2437 if (!sock_owned_by_user(sk))
2438 break;
2439 }
2440 finish_wait(&sk->sk_lock.wq, &wait);
2441 }
2442
2443 void __release_sock(struct sock *sk)
2444 __releases(&sk->sk_lock.slock)
2445 __acquires(&sk->sk_lock.slock)
2446 {
2447 struct sk_buff *skb, *next;
2448
2449 while ((skb = sk->sk_backlog.head) != NULL) {
2450 sk->sk_backlog.head = sk->sk_backlog.tail = NULL;
2451
2452 spin_unlock_bh(&sk->sk_lock.slock);
2453
2454 do {
2455 next = skb->next;
2456 prefetch(next);
2457 WARN_ON_ONCE(skb_dst_is_noref(skb));
2458 skb_mark_not_on_list(skb);
2459 sk_backlog_rcv(sk, skb);
2460
2461 cond_resched();
2462
2463 skb = next;
2464 } while (skb != NULL);
2465
2466 spin_lock_bh(&sk->sk_lock.slock);
2467 }
2468
2469 /*
2470 * Doing the zeroing here guarantee we can not loop forever
2471 * while a wild producer attempts to flood us.
2472 */
2473 sk->sk_backlog.len = 0;
2474 }
2475
2476 void __sk_flush_backlog(struct sock *sk)
2477 {
2478 spin_lock_bh(&sk->sk_lock.slock);
2479 __release_sock(sk);
2480 spin_unlock_bh(&sk->sk_lock.slock);
2481 }
2482
2483 /**
2484 * sk_wait_data - wait for data to arrive at sk_receive_queue
2485 * @sk: sock to wait on
2486 * @timeo: for how long
2487 * @skb: last skb seen on sk_receive_queue
2488 *
2489 * Now socket state including sk->sk_err is changed only under lock,
2490 * hence we may omit checks after joining wait queue.
2491 * We check receive queue before schedule() only as optimization;
2492 * it is very likely that release_sock() added new data.
2493 */
2494 int sk_wait_data(struct sock *sk, long *timeo, const struct sk_buff *skb)
2495 {
2496 DEFINE_WAIT_FUNC(wait, woken_wake_function);
2497 int rc;
2498
2499 add_wait_queue(sk_sleep(sk), &wait);
2500 sk_set_bit(SOCKWQ_ASYNC_WAITDATA, sk);
2501 rc = sk_wait_event(sk, timeo, skb_peek_tail(&sk->sk_receive_queue) != skb, &wait);
2502 sk_clear_bit(SOCKWQ_ASYNC_WAITDATA, sk);
2503 remove_wait_queue(sk_sleep(sk), &wait);
2504 return rc;
2505 }
2506 EXPORT_SYMBOL(sk_wait_data);
2507
2508 /**
2509 * __sk_mem_raise_allocated - increase memory_allocated
2510 * @sk: socket
2511 * @size: memory size to allocate
2512 * @amt: pages to allocate
2513 * @kind: allocation type
2514 *
2515 * Similar to __sk_mem_schedule(), but does not update sk_forward_alloc
2516 */
2517 int __sk_mem_raise_allocated(struct sock *sk, int size, int amt, int kind)
2518 {
2519 struct proto *prot = sk->sk_prot;
2520 long allocated = sk_memory_allocated_add(sk, amt);
2521 bool charged = true;
2522
2523 if (mem_cgroup_sockets_enabled && sk->sk_memcg &&
2524 !(charged = mem_cgroup_charge_skmem(sk->sk_memcg, amt)))
2525 goto suppress_allocation;
2526
2527 /* Under limit. */
2528 if (allocated <= sk_prot_mem_limits(sk, 0)) {
2529 sk_leave_memory_pressure(sk);
2530 return 1;
2531 }
2532
2533 /* Under pressure. */
2534 if (allocated > sk_prot_mem_limits(sk, 1))
2535 sk_enter_memory_pressure(sk);
2536
2537 /* Over hard limit. */
2538 if (allocated > sk_prot_mem_limits(sk, 2))
2539 goto suppress_allocation;
2540
2541 /* guarantee minimum buffer size under pressure */
2542 if (kind == SK_MEM_RECV) {
2543 if (atomic_read(&sk->sk_rmem_alloc) < sk_get_rmem0(sk, prot))
2544 return 1;
2545
2546 } else { /* SK_MEM_SEND */
2547 int wmem0 = sk_get_wmem0(sk, prot);
2548
2549 if (sk->sk_type == SOCK_STREAM) {
2550 if (sk->sk_wmem_queued < wmem0)
2551 return 1;
2552 } else if (refcount_read(&sk->sk_wmem_alloc) < wmem0) {
2553 return 1;
2554 }
2555 }
2556
2557 if (sk_has_memory_pressure(sk)) {
2558 u64 alloc;
2559
2560 if (!sk_under_memory_pressure(sk))
2561 return 1;
2562 alloc = sk_sockets_allocated_read_positive(sk);
2563 if (sk_prot_mem_limits(sk, 2) > alloc *
2564 sk_mem_pages(sk->sk_wmem_queued +
2565 atomic_read(&sk->sk_rmem_alloc) +
2566 sk->sk_forward_alloc))
2567 return 1;
2568 }
2569
2570 suppress_allocation:
2571
2572 if (kind == SK_MEM_SEND && sk->sk_type == SOCK_STREAM) {
2573 sk_stream_moderate_sndbuf(sk);
2574
2575 /* Fail only if socket is _under_ its sndbuf.
2576 * In this case we cannot block, so that we have to fail.
2577 */
2578 if (sk->sk_wmem_queued + size >= sk->sk_sndbuf)
2579 return 1;
2580 }
2581
2582 if (kind == SK_MEM_SEND || (kind == SK_MEM_RECV && charged))
2583 trace_sock_exceed_buf_limit(sk, prot, allocated, kind);
2584
2585 sk_memory_allocated_sub(sk, amt);
2586
2587 if (mem_cgroup_sockets_enabled && sk->sk_memcg)
2588 mem_cgroup_uncharge_skmem(sk->sk_memcg, amt);
2589
2590 return 0;
2591 }
2592 EXPORT_SYMBOL(__sk_mem_raise_allocated);
2593
2594 /**
2595 * __sk_mem_schedule - increase sk_forward_alloc and memory_allocated
2596 * @sk: socket
2597 * @size: memory size to allocate
2598 * @kind: allocation type
2599 *
2600 * If kind is SK_MEM_SEND, it means wmem allocation. Otherwise it means
2601 * rmem allocation. This function assumes that protocols which have
2602 * memory_pressure use sk_wmem_queued as write buffer accounting.
2603 */
2604 int __sk_mem_schedule(struct sock *sk, int size, int kind)
2605 {
2606 int ret, amt = sk_mem_pages(size);
2607
2608 sk->sk_forward_alloc += amt << SK_MEM_QUANTUM_SHIFT;
2609 ret = __sk_mem_raise_allocated(sk, size, amt, kind);
2610 if (!ret)
2611 sk->sk_forward_alloc -= amt << SK_MEM_QUANTUM_SHIFT;
2612 return ret;
2613 }
2614 EXPORT_SYMBOL(__sk_mem_schedule);
2615
2616 /**
2617 * __sk_mem_reduce_allocated - reclaim memory_allocated
2618 * @sk: socket
2619 * @amount: number of quanta
2620 *
2621 * Similar to __sk_mem_reclaim(), but does not update sk_forward_alloc
2622 */
2623 void __sk_mem_reduce_allocated(struct sock *sk, int amount)
2624 {
2625 sk_memory_allocated_sub(sk, amount);
2626
2627 if (mem_cgroup_sockets_enabled && sk->sk_memcg)
2628 mem_cgroup_uncharge_skmem(sk->sk_memcg, amount);
2629
2630 if (sk_under_memory_pressure(sk) &&
2631 (sk_memory_allocated(sk) < sk_prot_mem_limits(sk, 0)))
2632 sk_leave_memory_pressure(sk);
2633 }
2634 EXPORT_SYMBOL(__sk_mem_reduce_allocated);
2635
2636 /**
2637 * __sk_mem_reclaim - reclaim sk_forward_alloc and memory_allocated
2638 * @sk: socket
2639 * @amount: number of bytes (rounded down to a SK_MEM_QUANTUM multiple)
2640 */
2641 void __sk_mem_reclaim(struct sock *sk, int amount)
2642 {
2643 amount >>= SK_MEM_QUANTUM_SHIFT;
2644 sk->sk_forward_alloc -= amount << SK_MEM_QUANTUM_SHIFT;
2645 __sk_mem_reduce_allocated(sk, amount);
2646 }
2647 EXPORT_SYMBOL(__sk_mem_reclaim);
2648
2649 int sk_set_peek_off(struct sock *sk, int val)
2650 {
2651 sk->sk_peek_off = val;
2652 return 0;
2653 }
2654 EXPORT_SYMBOL_GPL(sk_set_peek_off);
2655
2656 /*
2657 * Set of default routines for initialising struct proto_ops when
2658 * the protocol does not support a particular function. In certain
2659 * cases where it makes no sense for a protocol to have a "do nothing"
2660 * function, some default processing is provided.
2661 */
2662
2663 int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len)
2664 {
2665 return -EOPNOTSUPP;
2666 }
2667 EXPORT_SYMBOL(sock_no_bind);
2668
2669 int sock_no_connect(struct socket *sock, struct sockaddr *saddr,
2670 int len, int flags)
2671 {
2672 return -EOPNOTSUPP;
2673 }
2674 EXPORT_SYMBOL(sock_no_connect);
2675
2676 int sock_no_socketpair(struct socket *sock1, struct socket *sock2)
2677 {
2678 return -EOPNOTSUPP;
2679 }
2680 EXPORT_SYMBOL(sock_no_socketpair);
2681
2682 int sock_no_accept(struct socket *sock, struct socket *newsock, int flags,
2683 bool kern)
2684 {
2685 return -EOPNOTSUPP;
2686 }
2687 EXPORT_SYMBOL(sock_no_accept);
2688
2689 int sock_no_getname(struct socket *sock, struct sockaddr *saddr,
2690 int peer)
2691 {
2692 return -EOPNOTSUPP;
2693 }
2694 EXPORT_SYMBOL(sock_no_getname);
2695
2696 int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
2697 {
2698 return -EOPNOTSUPP;
2699 }
2700 EXPORT_SYMBOL(sock_no_ioctl);
2701
2702 int sock_no_listen(struct socket *sock, int backlog)
2703 {
2704 return -EOPNOTSUPP;
2705 }
2706 EXPORT_SYMBOL(sock_no_listen);
2707
2708 int sock_no_shutdown(struct socket *sock, int how)
2709 {
2710 return -EOPNOTSUPP;
2711 }
2712 EXPORT_SYMBOL(sock_no_shutdown);
2713
2714 int sock_no_setsockopt(struct socket *sock, int level, int optname,
2715 char __user *optval, unsigned int optlen)
2716 {
2717 return -EOPNOTSUPP;
2718 }
2719 EXPORT_SYMBOL(sock_no_setsockopt);
2720
2721 int sock_no_getsockopt(struct socket *sock, int level, int optname,
2722 char __user *optval, int __user *optlen)
2723 {
2724 return -EOPNOTSUPP;
2725 }
2726 EXPORT_SYMBOL(sock_no_getsockopt);
2727
2728 int sock_no_sendmsg(struct socket *sock, struct msghdr *m, size_t len)
2729 {
2730 return -EOPNOTSUPP;
2731 }
2732 EXPORT_SYMBOL(sock_no_sendmsg);
2733
2734 int sock_no_sendmsg_locked(struct sock *sk, struct msghdr *m, size_t len)
2735 {
2736 return -EOPNOTSUPP;
2737 }
2738 EXPORT_SYMBOL(sock_no_sendmsg_locked);
2739
2740 int sock_no_recvmsg(struct socket *sock, struct msghdr *m, size_t len,
2741 int flags)
2742 {
2743 return -EOPNOTSUPP;
2744 }
2745 EXPORT_SYMBOL(sock_no_recvmsg);
2746
2747 int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma)
2748 {
2749 /* Mirror missing mmap method error code */
2750 return -ENODEV;
2751 }
2752 EXPORT_SYMBOL(sock_no_mmap);
2753
2754 ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags)
2755 {
2756 ssize_t res;
2757 struct msghdr msg = {.msg_flags = flags};
2758 struct kvec iov;
2759 char *kaddr = kmap(page);
2760 iov.iov_base = kaddr + offset;
2761 iov.iov_len = size;
2762 res = kernel_sendmsg(sock, &msg, &iov, 1, size);
2763 kunmap(page);
2764 return res;
2765 }
2766 EXPORT_SYMBOL(sock_no_sendpage);
2767
2768 ssize_t sock_no_sendpage_locked(struct sock *sk, struct page *page,
2769 int offset, size_t size, int flags)
2770 {
2771 ssize_t res;
2772 struct msghdr msg = {.msg_flags = flags};
2773 struct kvec iov;
2774 char *kaddr = kmap(page);
2775
2776 iov.iov_base = kaddr + offset;
2777 iov.iov_len = size;
2778 res = kernel_sendmsg_locked(sk, &msg, &iov, 1, size);
2779 kunmap(page);
2780 return res;
2781 }
2782 EXPORT_SYMBOL(sock_no_sendpage_locked);
2783
2784 /*
2785 * Default Socket Callbacks
2786 */
2787
2788 static void sock_def_wakeup(struct sock *sk)
2789 {
2790 struct socket_wq *wq;
2791
2792 rcu_read_lock();
2793 wq = rcu_dereference(sk->sk_wq);
2794 if (skwq_has_sleeper(wq))
2795 wake_up_interruptible_all(&wq->wait);
2796 rcu_read_unlock();
2797 }
2798
2799 static void sock_def_error_report(struct sock *sk)
2800 {
2801 struct socket_wq *wq;
2802
2803 rcu_read_lock();
2804 wq = rcu_dereference(sk->sk_wq);
2805 if (skwq_has_sleeper(wq))
2806 wake_up_interruptible_poll(&wq->wait, EPOLLERR);
2807 sk_wake_async(sk, SOCK_WAKE_IO, POLL_ERR);
2808 rcu_read_unlock();
2809 }
2810
2811 void sock_def_readable(struct sock *sk)
2812 {
2813 struct socket_wq *wq;
2814
2815 rcu_read_lock();
2816 wq = rcu_dereference(sk->sk_wq);
2817 if (skwq_has_sleeper(wq))
2818 wake_up_interruptible_sync_poll(&wq->wait, EPOLLIN | EPOLLPRI |
2819 EPOLLRDNORM | EPOLLRDBAND);
2820 sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN);
2821 rcu_read_unlock();
2822 }
2823
2824 static void sock_def_write_space(struct sock *sk)
2825 {
2826 struct socket_wq *wq;
2827
2828 rcu_read_lock();
2829
2830 /* Do not wake up a writer until he can make "significant"
2831 * progress. --DaveM
2832 */
2833 if ((refcount_read(&sk->sk_wmem_alloc) << 1) <= READ_ONCE(sk->sk_sndbuf)) {
2834 wq = rcu_dereference(sk->sk_wq);
2835 if (skwq_has_sleeper(wq))
2836 wake_up_interruptible_sync_poll(&wq->wait, EPOLLOUT |
2837 EPOLLWRNORM | EPOLLWRBAND);
2838
2839 /* Should agree with poll, otherwise some programs break */
2840 if (sock_writeable(sk))
2841 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
2842 }
2843
2844 rcu_read_unlock();
2845 }
2846
2847 static void sock_def_destruct(struct sock *sk)
2848 {
2849 }
2850
2851 void sk_send_sigurg(struct sock *sk)
2852 {
2853 if (sk->sk_socket && sk->sk_socket->file)
2854 if (send_sigurg(&sk->sk_socket->file->f_owner))
2855 sk_wake_async(sk, SOCK_WAKE_URG, POLL_PRI);
2856 }
2857 EXPORT_SYMBOL(sk_send_sigurg);
2858
2859 void sk_reset_timer(struct sock *sk, struct timer_list* timer,
2860 unsigned long expires)
2861 {
2862 if (!mod_timer(timer, expires))
2863 sock_hold(sk);
2864 }
2865 EXPORT_SYMBOL(sk_reset_timer);
2866
2867 void sk_stop_timer(struct sock *sk, struct timer_list* timer)
2868 {
2869 if (del_timer(timer))
2870 __sock_put(sk);
2871 }
2872 EXPORT_SYMBOL(sk_stop_timer);
2873
2874 void sock_init_data(struct socket *sock, struct sock *sk)
2875 {
2876 sk_init_common(sk);
2877 sk->sk_send_head = NULL;
2878
2879 timer_setup(&sk->sk_timer, NULL, 0);
2880
2881 sk->sk_allocation = GFP_KERNEL;
2882 sk->sk_rcvbuf = sysctl_rmem_default;
2883 sk->sk_sndbuf = sysctl_wmem_default;
2884 sk->sk_state = TCP_CLOSE;
2885 sk_set_socket(sk, sock);
2886
2887 sock_set_flag(sk, SOCK_ZAPPED);
2888
2889 if (sock) {
2890 sk->sk_type = sock->type;
2891 RCU_INIT_POINTER(sk->sk_wq, &sock->wq);
2892 sock->sk = sk;
2893 sk->sk_uid = SOCK_INODE(sock)->i_uid;
2894 } else {
2895 RCU_INIT_POINTER(sk->sk_wq, NULL);
2896 sk->sk_uid = make_kuid(sock_net(sk)->user_ns, 0);
2897 }
2898
2899 rwlock_init(&sk->sk_callback_lock);
2900 if (sk->sk_kern_sock)
2901 lockdep_set_class_and_name(
2902 &sk->sk_callback_lock,
2903 af_kern_callback_keys + sk->sk_family,
2904 af_family_kern_clock_key_strings[sk->sk_family]);
2905 else
2906 lockdep_set_class_and_name(
2907 &sk->sk_callback_lock,
2908 af_callback_keys + sk->sk_family,
2909 af_family_clock_key_strings[sk->sk_family]);
2910
2911 sk->sk_state_change = sock_def_wakeup;
2912 sk->sk_data_ready = sock_def_readable;
2913 sk->sk_write_space = sock_def_write_space;
2914 sk->sk_error_report = sock_def_error_report;
2915 sk->sk_destruct = sock_def_destruct;
2916
2917 sk->sk_frag.page = NULL;
2918 sk->sk_frag.offset = 0;
2919 sk->sk_peek_off = -1;
2920
2921 sk->sk_peer_pid = NULL;
2922 sk->sk_peer_cred = NULL;
2923 sk->sk_write_pending = 0;
2924 sk->sk_rcvlowat = 1;
2925 sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT;
2926 sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT;
2927
2928 sk->sk_stamp = SK_DEFAULT_STAMP;
2929 #if BITS_PER_LONG==32
2930 seqlock_init(&sk->sk_stamp_seq);
2931 #endif
2932 atomic_set(&sk->sk_zckey, 0);
2933
2934 #ifdef CONFIG_NET_RX_BUSY_POLL
2935 sk->sk_napi_id = 0;
2936 sk->sk_ll_usec = sysctl_net_busy_read;
2937 #endif
2938
2939 sk->sk_max_pacing_rate = ~0UL;
2940 sk->sk_pacing_rate = ~0UL;
2941 WRITE_ONCE(sk->sk_pacing_shift, 10);
2942 sk->sk_incoming_cpu = -1;
2943
2944 sk_rx_queue_clear(sk);
2945 /*
2946 * Before updating sk_refcnt, we must commit prior changes to memory
2947 * (Documentation/RCU/rculist_nulls.txt for details)
2948 */
2949 smp_wmb();
2950 refcount_set(&sk->sk_refcnt, 1);
2951 atomic_set(&sk->sk_drops, 0);
2952 }
2953 EXPORT_SYMBOL(sock_init_data);
2954
2955 void lock_sock_nested(struct sock *sk, int subclass)
2956 {
2957 might_sleep();
2958 spin_lock_bh(&sk->sk_lock.slock);
2959 if (sk->sk_lock.owned)
2960 __lock_sock(sk);
2961 sk->sk_lock.owned = 1;
2962 spin_unlock(&sk->sk_lock.slock);
2963 /*
2964 * The sk_lock has mutex_lock() semantics here:
2965 */
2966 mutex_acquire(&sk->sk_lock.dep_map, subclass, 0, _RET_IP_);
2967 local_bh_enable();
2968 }
2969 EXPORT_SYMBOL(lock_sock_nested);
2970
2971 void release_sock(struct sock *sk)
2972 {
2973 spin_lock_bh(&sk->sk_lock.slock);
2974 if (sk->sk_backlog.tail)
2975 __release_sock(sk);
2976
2977 /* Warning : release_cb() might need to release sk ownership,
2978 * ie call sock_release_ownership(sk) before us.
2979 */
2980 if (sk->sk_prot->release_cb)
2981 sk->sk_prot->release_cb(sk);
2982
2983 sock_release_ownership(sk);
2984 if (waitqueue_active(&sk->sk_lock.wq))
2985 wake_up(&sk->sk_lock.wq);
2986 spin_unlock_bh(&sk->sk_lock.slock);
2987 }
2988 EXPORT_SYMBOL(release_sock);
2989
2990 /**
2991 * lock_sock_fast - fast version of lock_sock
2992 * @sk: socket
2993 *
2994 * This version should be used for very small section, where process wont block
2995 * return false if fast path is taken:
2996 *
2997 * sk_lock.slock locked, owned = 0, BH disabled
2998 *
2999 * return true if slow path is taken:
3000 *
3001 * sk_lock.slock unlocked, owned = 1, BH enabled
3002 */
3003 bool lock_sock_fast(struct sock *sk)
3004 {
3005 might_sleep();
3006 spin_lock_bh(&sk->sk_lock.slock);
3007
3008 if (!sk->sk_lock.owned)
3009 /*
3010 * Note : We must disable BH
3011 */
3012 return false;
3013
3014 __lock_sock(sk);
3015 sk->sk_lock.owned = 1;
3016 spin_unlock(&sk->sk_lock.slock);
3017 /*
3018 * The sk_lock has mutex_lock() semantics here:
3019 */
3020 mutex_acquire(&sk->sk_lock.dep_map, 0, 0, _RET_IP_);
3021 local_bh_enable();
3022 return true;
3023 }
3024 EXPORT_SYMBOL(lock_sock_fast);
3025
3026 int sock_gettstamp(struct socket *sock, void __user *userstamp,
3027 bool timeval, bool time32)
3028 {
3029 struct sock *sk = sock->sk;
3030 struct timespec64 ts;
3031
3032 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
3033 ts = ktime_to_timespec64(sock_read_timestamp(sk));
3034 if (ts.tv_sec == -1)
3035 return -ENOENT;
3036 if (ts.tv_sec == 0) {
3037 ktime_t kt = ktime_get_real();
3038 sock_write_timestamp(sk, kt);
3039 ts = ktime_to_timespec64(kt);
3040 }
3041
3042 if (timeval)
3043 ts.tv_nsec /= 1000;
3044
3045 #ifdef CONFIG_COMPAT_32BIT_TIME
3046 if (time32)
3047 return put_old_timespec32(&ts, userstamp);
3048 #endif
3049 #ifdef CONFIG_SPARC64
3050 /* beware of padding in sparc64 timeval */
3051 if (timeval && !in_compat_syscall()) {
3052 struct __kernel_old_timeval __user tv = {
3053 .tv_sec = ts.tv_sec,
3054 .tv_usec = ts.tv_nsec,
3055 };
3056 if (copy_to_user(userstamp, &tv, sizeof(tv)))
3057 return -EFAULT;
3058 return 0;
3059 }
3060 #endif
3061 return put_timespec64(&ts, userstamp);
3062 }
3063 EXPORT_SYMBOL(sock_gettstamp);
3064
3065 void sock_enable_timestamp(struct sock *sk, enum sock_flags flag)
3066 {
3067 if (!sock_flag(sk, flag)) {
3068 unsigned long previous_flags = sk->sk_flags;
3069
3070 sock_set_flag(sk, flag);
3071 /*
3072 * we just set one of the two flags which require net
3073 * time stamping, but time stamping might have been on
3074 * already because of the other one
3075 */
3076 if (sock_needs_netstamp(sk) &&
3077 !(previous_flags & SK_FLAGS_TIMESTAMP))
3078 net_enable_timestamp();
3079 }
3080 }
3081
3082 int sock_recv_errqueue(struct sock *sk, struct msghdr *msg, int len,
3083 int level, int type)
3084 {
3085 struct sock_exterr_skb *serr;
3086 struct sk_buff *skb;
3087 int copied, err;
3088
3089 err = -EAGAIN;
3090 skb = sock_dequeue_err_skb(sk);
3091 if (skb == NULL)
3092 goto out;
3093
3094 copied = skb->len;
3095 if (copied > len) {
3096 msg->msg_flags |= MSG_TRUNC;
3097 copied = len;
3098 }
3099 err = skb_copy_datagram_msg(skb, 0, msg, copied);
3100 if (err)
3101 goto out_free_skb;
3102
3103 sock_recv_timestamp(msg, sk, skb);
3104
3105 serr = SKB_EXT_ERR(skb);
3106 put_cmsg(msg, level, type, sizeof(serr->ee), &serr->ee);
3107
3108 msg->msg_flags |= MSG_ERRQUEUE;
3109 err = copied;
3110
3111 out_free_skb:
3112 kfree_skb(skb);
3113 out:
3114 return err;
3115 }
3116 EXPORT_SYMBOL(sock_recv_errqueue);
3117
3118 /*
3119 * Get a socket option on an socket.
3120 *
3121 * FIX: POSIX 1003.1g is very ambiguous here. It states that
3122 * asynchronous errors should be reported by getsockopt. We assume
3123 * this means if you specify SO_ERROR (otherwise whats the point of it).
3124 */
3125 int sock_common_getsockopt(struct socket *sock, int level, int optname,
3126 char __user *optval, int __user *optlen)
3127 {
3128 struct sock *sk = sock->sk;
3129
3130 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
3131 }
3132 EXPORT_SYMBOL(sock_common_getsockopt);
3133
3134 #ifdef CONFIG_COMPAT
3135 int compat_sock_common_getsockopt(struct socket *sock, int level, int optname,
3136 char __user *optval, int __user *optlen)
3137 {
3138 struct sock *sk = sock->sk;
3139
3140 if (sk->sk_prot->compat_getsockopt != NULL)
3141 return sk->sk_prot->compat_getsockopt(sk, level, optname,
3142 optval, optlen);
3143 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
3144 }
3145 EXPORT_SYMBOL(compat_sock_common_getsockopt);
3146 #endif
3147
3148 int sock_common_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
3149 int flags)
3150 {
3151 struct sock *sk = sock->sk;
3152 int addr_len = 0;
3153 int err;
3154
3155 err = sk->sk_prot->recvmsg(sk, msg, size, flags & MSG_DONTWAIT,
3156 flags & ~MSG_DONTWAIT, &addr_len);
3157 if (err >= 0)
3158 msg->msg_namelen = addr_len;
3159 return err;
3160 }
3161 EXPORT_SYMBOL(sock_common_recvmsg);
3162
3163 /*
3164 * Set socket options on an inet socket.
3165 */
3166 int sock_common_setsockopt(struct socket *sock, int level, int optname,
3167 char __user *optval, unsigned int optlen)
3168 {
3169 struct sock *sk = sock->sk;
3170
3171 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
3172 }
3173 EXPORT_SYMBOL(sock_common_setsockopt);
3174
3175 #ifdef CONFIG_COMPAT
3176 int compat_sock_common_setsockopt(struct socket *sock, int level, int optname,
3177 char __user *optval, unsigned int optlen)
3178 {
3179 struct sock *sk = sock->sk;
3180
3181 if (sk->sk_prot->compat_setsockopt != NULL)
3182 return sk->sk_prot->compat_setsockopt(sk, level, optname,
3183 optval, optlen);
3184 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
3185 }
3186 EXPORT_SYMBOL(compat_sock_common_setsockopt);
3187 #endif
3188
3189 void sk_common_release(struct sock *sk)
3190 {
3191 if (sk->sk_prot->destroy)
3192 sk->sk_prot->destroy(sk);
3193
3194 /*
3195 * Observation: when sock_common_release is called, processes have
3196 * no access to socket. But net still has.
3197 * Step one, detach it from networking:
3198 *
3199 * A. Remove from hash tables.
3200 */
3201
3202 sk->sk_prot->unhash(sk);
3203
3204 /*
3205 * In this point socket cannot receive new packets, but it is possible
3206 * that some packets are in flight because some CPU runs receiver and
3207 * did hash table lookup before we unhashed socket. They will achieve
3208 * receive queue and will be purged by socket destructor.
3209 *
3210 * Also we still have packets pending on receive queue and probably,
3211 * our own packets waiting in device queues. sock_destroy will drain
3212 * receive queue, but transmitted packets will delay socket destruction
3213 * until the last reference will be released.
3214 */
3215
3216 sock_orphan(sk);
3217
3218 xfrm_sk_free_policy(sk);
3219
3220 sk_refcnt_debug_release(sk);
3221
3222 sock_put(sk);
3223 }
3224 EXPORT_SYMBOL(sk_common_release);
3225
3226 void sk_get_meminfo(const struct sock *sk, u32 *mem)
3227 {
3228 memset(mem, 0, sizeof(*mem) * SK_MEMINFO_VARS);
3229
3230 mem[SK_MEMINFO_RMEM_ALLOC] = sk_rmem_alloc_get(sk);
3231 mem[SK_MEMINFO_RCVBUF] = READ_ONCE(sk->sk_rcvbuf);
3232 mem[SK_MEMINFO_WMEM_ALLOC] = sk_wmem_alloc_get(sk);
3233 mem[SK_MEMINFO_SNDBUF] = READ_ONCE(sk->sk_sndbuf);
3234 mem[SK_MEMINFO_FWD_ALLOC] = sk->sk_forward_alloc;
3235 mem[SK_MEMINFO_WMEM_QUEUED] = READ_ONCE(sk->sk_wmem_queued);
3236 mem[SK_MEMINFO_OPTMEM] = atomic_read(&sk->sk_omem_alloc);
3237 mem[SK_MEMINFO_BACKLOG] = READ_ONCE(sk->sk_backlog.len);
3238 mem[SK_MEMINFO_DROPS] = atomic_read(&sk->sk_drops);
3239 }
3240
3241 #ifdef CONFIG_PROC_FS
3242 #define PROTO_INUSE_NR 64 /* should be enough for the first time */
3243 struct prot_inuse {
3244 int val[PROTO_INUSE_NR];
3245 };
3246
3247 static DECLARE_BITMAP(proto_inuse_idx, PROTO_INUSE_NR);
3248
3249 void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
3250 {
3251 __this_cpu_add(net->core.prot_inuse->val[prot->inuse_idx], val);
3252 }
3253 EXPORT_SYMBOL_GPL(sock_prot_inuse_add);
3254
3255 int sock_prot_inuse_get(struct net *net, struct proto *prot)
3256 {
3257 int cpu, idx = prot->inuse_idx;
3258 int res = 0;
3259
3260 for_each_possible_cpu(cpu)
3261 res += per_cpu_ptr(net->core.prot_inuse, cpu)->val[idx];
3262
3263 return res >= 0 ? res : 0;
3264 }
3265 EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
3266
3267 static void sock_inuse_add(struct net *net, int val)
3268 {
3269 this_cpu_add(*net->core.sock_inuse, val);
3270 }
3271
3272 int sock_inuse_get(struct net *net)
3273 {
3274 int cpu, res = 0;
3275
3276 for_each_possible_cpu(cpu)
3277 res += *per_cpu_ptr(net->core.sock_inuse, cpu);
3278
3279 return res;
3280 }
3281
3282 EXPORT_SYMBOL_GPL(sock_inuse_get);
3283
3284 static int __net_init sock_inuse_init_net(struct net *net)
3285 {
3286 net->core.prot_inuse = alloc_percpu(struct prot_inuse);
3287 if (net->core.prot_inuse == NULL)
3288 return -ENOMEM;
3289
3290 net->core.sock_inuse = alloc_percpu(int);
3291 if (net->core.sock_inuse == NULL)
3292 goto out;
3293
3294 return 0;
3295
3296 out:
3297 free_percpu(net->core.prot_inuse);
3298 return -ENOMEM;
3299 }
3300
3301 static void __net_exit sock_inuse_exit_net(struct net *net)
3302 {
3303 free_percpu(net->core.prot_inuse);
3304 free_percpu(net->core.sock_inuse);
3305 }
3306
3307 static struct pernet_operations net_inuse_ops = {
3308 .init = sock_inuse_init_net,
3309 .exit = sock_inuse_exit_net,
3310 };
3311
3312 static __init int net_inuse_init(void)
3313 {
3314 if (register_pernet_subsys(&net_inuse_ops))
3315 panic("Cannot initialize net inuse counters");
3316
3317 return 0;
3318 }
3319
3320 core_initcall(net_inuse_init);
3321
3322 static int assign_proto_idx(struct proto *prot)
3323 {
3324 prot->inuse_idx = find_first_zero_bit(proto_inuse_idx, PROTO_INUSE_NR);
3325
3326 if (unlikely(prot->inuse_idx == PROTO_INUSE_NR - 1)) {
3327 pr_err("PROTO_INUSE_NR exhausted\n");
3328 return -ENOSPC;
3329 }
3330
3331 set_bit(prot->inuse_idx, proto_inuse_idx);
3332 return 0;
3333 }
3334
3335 static void release_proto_idx(struct proto *prot)
3336 {
3337 if (prot->inuse_idx != PROTO_INUSE_NR - 1)
3338 clear_bit(prot->inuse_idx, proto_inuse_idx);
3339 }
3340 #else
3341 static inline int assign_proto_idx(struct proto *prot)
3342 {
3343 return 0;
3344 }
3345
3346 static inline void release_proto_idx(struct proto *prot)
3347 {
3348 }
3349
3350 static void sock_inuse_add(struct net *net, int val)
3351 {
3352 }
3353 #endif
3354
3355 static void req_prot_cleanup(struct request_sock_ops *rsk_prot)
3356 {
3357 if (!rsk_prot)
3358 return;
3359 kfree(rsk_prot->slab_name);
3360 rsk_prot->slab_name = NULL;
3361 kmem_cache_destroy(rsk_prot->slab);
3362 rsk_prot->slab = NULL;
3363 }
3364
3365 static int req_prot_init(const struct proto *prot)
3366 {
3367 struct request_sock_ops *rsk_prot = prot->rsk_prot;
3368
3369 if (!rsk_prot)
3370 return 0;
3371
3372 rsk_prot->slab_name = kasprintf(GFP_KERNEL, "request_sock_%s",
3373 prot->name);
3374 if (!rsk_prot->slab_name)
3375 return -ENOMEM;
3376
3377 rsk_prot->slab = kmem_cache_create(rsk_prot->slab_name,
3378 rsk_prot->obj_size, 0,
3379 SLAB_ACCOUNT | prot->slab_flags,
3380 NULL);
3381
3382 if (!rsk_prot->slab) {
3383 pr_crit("%s: Can't create request sock SLAB cache!\n",
3384 prot->name);
3385 return -ENOMEM;
3386 }
3387 return 0;
3388 }
3389
3390 int proto_register(struct proto *prot, int alloc_slab)
3391 {
3392 int ret = -ENOBUFS;
3393
3394 if (alloc_slab) {
3395 prot->slab = kmem_cache_create_usercopy(prot->name,
3396 prot->obj_size, 0,
3397 SLAB_HWCACHE_ALIGN | SLAB_ACCOUNT |
3398 prot->slab_flags,
3399 prot->useroffset, prot->usersize,
3400 NULL);
3401
3402 if (prot->slab == NULL) {
3403 pr_crit("%s: Can't create sock SLAB cache!\n",
3404 prot->name);
3405 goto out;
3406 }
3407
3408 if (req_prot_init(prot))
3409 goto out_free_request_sock_slab;
3410
3411 if (prot->twsk_prot != NULL) {
3412 prot->twsk_prot->twsk_slab_name = kasprintf(GFP_KERNEL, "tw_sock_%s", prot->name);
3413
3414 if (prot->twsk_prot->twsk_slab_name == NULL)
3415 goto out_free_request_sock_slab;
3416
3417 prot->twsk_prot->twsk_slab =
3418 kmem_cache_create(prot->twsk_prot->twsk_slab_name,
3419 prot->twsk_prot->twsk_obj_size,
3420 0,
3421 SLAB_ACCOUNT |
3422 prot->slab_flags,
3423 NULL);
3424 if (prot->twsk_prot->twsk_slab == NULL)
3425 goto out_free_timewait_sock_slab_name;
3426 }
3427 }
3428
3429 mutex_lock(&proto_list_mutex);
3430 ret = assign_proto_idx(prot);
3431 if (ret) {
3432 mutex_unlock(&proto_list_mutex);
3433 goto out_free_timewait_sock_slab_name;
3434 }
3435 list_add(&prot->node, &proto_list);
3436 mutex_unlock(&proto_list_mutex);
3437 return ret;
3438
3439 out_free_timewait_sock_slab_name:
3440 if (alloc_slab && prot->twsk_prot)
3441 kfree(prot->twsk_prot->twsk_slab_name);
3442 out_free_request_sock_slab:
3443 if (alloc_slab) {
3444 req_prot_cleanup(prot->rsk_prot);
3445
3446 kmem_cache_destroy(prot->slab);
3447 prot->slab = NULL;
3448 }
3449 out:
3450 return ret;
3451 }
3452 EXPORT_SYMBOL(proto_register);
3453
3454 void proto_unregister(struct proto *prot)
3455 {
3456 mutex_lock(&proto_list_mutex);
3457 release_proto_idx(prot);
3458 list_del(&prot->node);
3459 mutex_unlock(&proto_list_mutex);
3460
3461 kmem_cache_destroy(prot->slab);
3462 prot->slab = NULL;
3463
3464 req_prot_cleanup(prot->rsk_prot);
3465
3466 if (prot->twsk_prot != NULL && prot->twsk_prot->twsk_slab != NULL) {
3467 kmem_cache_destroy(prot->twsk_prot->twsk_slab);
3468 kfree(prot->twsk_prot->twsk_slab_name);
3469 prot->twsk_prot->twsk_slab = NULL;
3470 }
3471 }
3472 EXPORT_SYMBOL(proto_unregister);
3473
3474 int sock_load_diag_module(int family, int protocol)
3475 {
3476 if (!protocol) {
3477 if (!sock_is_registered(family))
3478 return -ENOENT;
3479
3480 return request_module("net-pf-%d-proto-%d-type-%d", PF_NETLINK,
3481 NETLINK_SOCK_DIAG, family);
3482 }
3483
3484 #ifdef CONFIG_INET
3485 if (family == AF_INET &&
3486 protocol != IPPROTO_RAW &&
3487 !rcu_access_pointer(inet_protos[protocol]))
3488 return -ENOENT;
3489 #endif
3490
3491 return request_module("net-pf-%d-proto-%d-type-%d-%d", PF_NETLINK,
3492 NETLINK_SOCK_DIAG, family, protocol);
3493 }
3494 EXPORT_SYMBOL(sock_load_diag_module);
3495
3496 #ifdef CONFIG_PROC_FS
3497 static void *proto_seq_start(struct seq_file *seq, loff_t *pos)
3498 __acquires(proto_list_mutex)
3499 {
3500 mutex_lock(&proto_list_mutex);
3501 return seq_list_start_head(&proto_list, *pos);
3502 }
3503
3504 static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3505 {
3506 return seq_list_next(v, &proto_list, pos);
3507 }
3508
3509 static void proto_seq_stop(struct seq_file *seq, void *v)
3510 __releases(proto_list_mutex)
3511 {
3512 mutex_unlock(&proto_list_mutex);
3513 }
3514
3515 static char proto_method_implemented(const void *method)
3516 {
3517 return method == NULL ? 'n' : 'y';
3518 }
3519 static long sock_prot_memory_allocated(struct proto *proto)
3520 {
3521 return proto->memory_allocated != NULL ? proto_memory_allocated(proto) : -1L;
3522 }
3523
3524 static const char *sock_prot_memory_pressure(struct proto *proto)
3525 {
3526 return proto->memory_pressure != NULL ?
3527 proto_memory_pressure(proto) ? "yes" : "no" : "NI";
3528 }
3529
3530 static void proto_seq_printf(struct seq_file *seq, struct proto *proto)
3531 {
3532
3533 seq_printf(seq, "%-9s %4u %6d %6ld %-3s %6u %-3s %-10s "
3534 "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n",
3535 proto->name,
3536 proto->obj_size,
3537 sock_prot_inuse_get(seq_file_net(seq), proto),
3538 sock_prot_memory_allocated(proto),
3539 sock_prot_memory_pressure(proto),
3540 proto->max_header,
3541 proto->slab == NULL ? "no" : "yes",
3542 module_name(proto->owner),
3543 proto_method_implemented(proto->close),
3544 proto_method_implemented(proto->connect),
3545 proto_method_implemented(proto->disconnect),
3546 proto_method_implemented(proto->accept),
3547 proto_method_implemented(proto->ioctl),
3548 proto_method_implemented(proto->init),
3549 proto_method_implemented(proto->destroy),
3550 proto_method_implemented(proto->shutdown),
3551 proto_method_implemented(proto->setsockopt),
3552 proto_method_implemented(proto->getsockopt),
3553 proto_method_implemented(proto->sendmsg),
3554 proto_method_implemented(proto->recvmsg),
3555 proto_method_implemented(proto->sendpage),
3556 proto_method_implemented(proto->bind),
3557 proto_method_implemented(proto->backlog_rcv),
3558 proto_method_implemented(proto->hash),
3559 proto_method_implemented(proto->unhash),
3560 proto_method_implemented(proto->get_port),
3561 proto_method_implemented(proto->enter_memory_pressure));
3562 }
3563
3564 static int proto_seq_show(struct seq_file *seq, void *v)
3565 {
3566 if (v == &proto_list)
3567 seq_printf(seq, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s",
3568 "protocol",
3569 "size",
3570 "sockets",
3571 "memory",
3572 "press",
3573 "maxhdr",
3574 "slab",
3575 "module",
3576 "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n");
3577 else
3578 proto_seq_printf(seq, list_entry(v, struct proto, node));
3579 return 0;
3580 }
3581
3582 static const struct seq_operations proto_seq_ops = {
3583 .start = proto_seq_start,
3584 .next = proto_seq_next,
3585 .stop = proto_seq_stop,
3586 .show = proto_seq_show,
3587 };
3588
3589 static __net_init int proto_init_net(struct net *net)
3590 {
3591 if (!proc_create_net("protocols", 0444, net->proc_net, &proto_seq_ops,
3592 sizeof(struct seq_net_private)))
3593 return -ENOMEM;
3594
3595 return 0;
3596 }
3597
3598 static __net_exit void proto_exit_net(struct net *net)
3599 {
3600 remove_proc_entry("protocols", net->proc_net);
3601 }
3602
3603
3604 static __net_initdata struct pernet_operations proto_net_ops = {
3605 .init = proto_init_net,
3606 .exit = proto_exit_net,
3607 };
3608
3609 static int __init proto_init(void)
3610 {
3611 return register_pernet_subsys(&proto_net_ops);
3612 }
3613
3614 subsys_initcall(proto_init);
3615
3616 #endif /* PROC_FS */
3617
3618 #ifdef CONFIG_NET_RX_BUSY_POLL
3619 bool sk_busy_loop_end(void *p, unsigned long start_time)
3620 {
3621 struct sock *sk = p;
3622
3623 return !skb_queue_empty_lockless(&sk->sk_receive_queue) ||
3624 sk_busy_loop_timeout(sk, start_time);
3625 }
3626 EXPORT_SYMBOL(sk_busy_loop_end);
3627 #endif /* CONFIG_NET_RX_BUSY_POLL */
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