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io_uring: ensure finish_wait() is always called in __io_uring_task_cancel()
[linux/fpc-iii.git] / net / core / sock.c
blobbbcd4b97eddd1341a71760f95a9420930a0e8f64
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 #include <linux/compat.h>
117
118 #include <linux/uaccess.h>
119
120 #include <linux/netdevice.h>
121 #include <net/protocol.h>
122 #include <linux/skbuff.h>
123 #include <net/net_namespace.h>
124 #include <net/request_sock.h>
125 #include <net/sock.h>
126 #include <linux/net_tstamp.h>
127 #include <net/xfrm.h>
128 #include <linux/ipsec.h>
129 #include <net/cls_cgroup.h>
130 #include <net/netprio_cgroup.h>
131 #include <linux/sock_diag.h>
132
133 #include <linux/filter.h>
134 #include <net/sock_reuseport.h>
135 #include <net/bpf_sk_storage.h>
136
137 #include <trace/events/sock.h>
138
139 #include <net/tcp.h>
140 #include <net/busy_poll.h>
141
142 static DEFINE_MUTEX(proto_list_mutex);
143 static LIST_HEAD(proto_list);
144
145 static void sock_inuse_add(struct net *net, int val);
146
147 /**
148 * sk_ns_capable - General socket capability test
149 * @sk: Socket to use a capability on or through
150 * @user_ns: The user namespace of the capability to use
151 * @cap: The capability to use
152 *
153 * Test to see if the opener of the socket had when the socket was
154 * created and the current process has the capability @cap in the user
155 * namespace @user_ns.
156 */
157 bool sk_ns_capable(const struct sock *sk,
158 struct user_namespace *user_ns, int cap)
159 {
160 return file_ns_capable(sk->sk_socket->file, user_ns, cap) &&
161 ns_capable(user_ns, cap);
162 }
163 EXPORT_SYMBOL(sk_ns_capable);
164
165 /**
166 * sk_capable - Socket global capability test
167 * @sk: Socket to use a capability on or through
168 * @cap: The global capability to use
169 *
170 * Test to see if the opener of the socket had when the socket was
171 * created and the current process has the capability @cap in all user
172 * namespaces.
173 */
174 bool sk_capable(const struct sock *sk, int cap)
175 {
176 return sk_ns_capable(sk, &init_user_ns, cap);
177 }
178 EXPORT_SYMBOL(sk_capable);
179
180 /**
181 * sk_net_capable - Network namespace socket capability test
182 * @sk: Socket to use a capability on or through
183 * @cap: The capability to use
184 *
185 * Test to see if the opener of the socket had when the socket was created
186 * and the current process has the capability @cap over the network namespace
187 * the socket is a member of.
188 */
189 bool sk_net_capable(const struct sock *sk, int cap)
190 {
191 return sk_ns_capable(sk, sock_net(sk)->user_ns, cap);
192 }
193 EXPORT_SYMBOL(sk_net_capable);
194
195 /*
196 * Each address family might have different locking rules, so we have
197 * one slock key per address family and separate keys for internal and
198 * userspace sockets.
199 */
200 static struct lock_class_key af_family_keys[AF_MAX];
201 static struct lock_class_key af_family_kern_keys[AF_MAX];
202 static struct lock_class_key af_family_slock_keys[AF_MAX];
203 static struct lock_class_key af_family_kern_slock_keys[AF_MAX];
204
205 /*
206 * Make lock validator output more readable. (we pre-construct these
207 * strings build-time, so that runtime initialization of socket
208 * locks is fast):
209 */
210
211 #define _sock_locks(x) \
212 x "AF_UNSPEC", x "AF_UNIX" , x "AF_INET" , \
213 x "AF_AX25" , x "AF_IPX" , x "AF_APPLETALK", \
214 x "AF_NETROM", x "AF_BRIDGE" , x "AF_ATMPVC" , \
215 x "AF_X25" , x "AF_INET6" , x "AF_ROSE" , \
216 x "AF_DECnet", x "AF_NETBEUI" , x "AF_SECURITY" , \
217 x "AF_KEY" , x "AF_NETLINK" , x "AF_PACKET" , \
218 x "AF_ASH" , x "AF_ECONET" , x "AF_ATMSVC" , \
219 x "AF_RDS" , x "AF_SNA" , x "AF_IRDA" , \
220 x "AF_PPPOX" , x "AF_WANPIPE" , x "AF_LLC" , \
221 x "27" , x "28" , x "AF_CAN" , \
222 x "AF_TIPC" , x "AF_BLUETOOTH", x "IUCV" , \
223 x "AF_RXRPC" , x "AF_ISDN" , x "AF_PHONET" , \
224 x "AF_IEEE802154", x "AF_CAIF" , x "AF_ALG" , \
225 x "AF_NFC" , x "AF_VSOCK" , x "AF_KCM" , \
226 x "AF_QIPCRTR", x "AF_SMC" , x "AF_XDP" , \
227 x "AF_MAX"
228
229 static const char *const af_family_key_strings[AF_MAX+1] = {
230 _sock_locks("sk_lock-")
231 };
232 static const char *const af_family_slock_key_strings[AF_MAX+1] = {
233 _sock_locks("slock-")
234 };
235 static const char *const af_family_clock_key_strings[AF_MAX+1] = {
236 _sock_locks("clock-")
237 };
238
239 static const char *const af_family_kern_key_strings[AF_MAX+1] = {
240 _sock_locks("k-sk_lock-")
241 };
242 static const char *const af_family_kern_slock_key_strings[AF_MAX+1] = {
243 _sock_locks("k-slock-")
244 };
245 static const char *const af_family_kern_clock_key_strings[AF_MAX+1] = {
246 _sock_locks("k-clock-")
247 };
248 static const char *const af_family_rlock_key_strings[AF_MAX+1] = {
249 _sock_locks("rlock-")
250 };
251 static const char *const af_family_wlock_key_strings[AF_MAX+1] = {
252 _sock_locks("wlock-")
253 };
254 static const char *const af_family_elock_key_strings[AF_MAX+1] = {
255 _sock_locks("elock-")
256 };
257
258 /*
259 * sk_callback_lock and sk queues locking rules are per-address-family,
260 * so split the lock classes by using a per-AF key:
261 */
262 static struct lock_class_key af_callback_keys[AF_MAX];
263 static struct lock_class_key af_rlock_keys[AF_MAX];
264 static struct lock_class_key af_wlock_keys[AF_MAX];
265 static struct lock_class_key af_elock_keys[AF_MAX];
266 static struct lock_class_key af_kern_callback_keys[AF_MAX];
267
268 /* Run time adjustable parameters. */
269 __u32 sysctl_wmem_max __read_mostly = SK_WMEM_MAX;
270 EXPORT_SYMBOL(sysctl_wmem_max);
271 __u32 sysctl_rmem_max __read_mostly = SK_RMEM_MAX;
272 EXPORT_SYMBOL(sysctl_rmem_max);
273 __u32 sysctl_wmem_default __read_mostly = SK_WMEM_MAX;
274 __u32 sysctl_rmem_default __read_mostly = SK_RMEM_MAX;
275
276 /* Maximal space eaten by iovec or ancillary data plus some space */
277 int sysctl_optmem_max __read_mostly = sizeof(unsigned long)*(2*UIO_MAXIOV+512);
278 EXPORT_SYMBOL(sysctl_optmem_max);
279
280 int sysctl_tstamp_allow_data __read_mostly = 1;
281
282 DEFINE_STATIC_KEY_FALSE(memalloc_socks_key);
283 EXPORT_SYMBOL_GPL(memalloc_socks_key);
284
285 /**
286 * sk_set_memalloc - sets %SOCK_MEMALLOC
287 * @sk: socket to set it on
288 *
289 * Set %SOCK_MEMALLOC on a socket for access to emergency reserves.
290 * It's the responsibility of the admin to adjust min_free_kbytes
291 * to meet the requirements
292 */
293 void sk_set_memalloc(struct sock *sk)
294 {
295 sock_set_flag(sk, SOCK_MEMALLOC);
296 sk->sk_allocation |= __GFP_MEMALLOC;
297 static_branch_inc(&memalloc_socks_key);
298 }
299 EXPORT_SYMBOL_GPL(sk_set_memalloc);
300
301 void sk_clear_memalloc(struct sock *sk)
302 {
303 sock_reset_flag(sk, SOCK_MEMALLOC);
304 sk->sk_allocation &= ~__GFP_MEMALLOC;
305 static_branch_dec(&memalloc_socks_key);
306
307 /*
308 * SOCK_MEMALLOC is allowed to ignore rmem limits to ensure forward
309 * progress of swapping. SOCK_MEMALLOC may be cleared while
310 * it has rmem allocations due to the last swapfile being deactivated
311 * but there is a risk that the socket is unusable due to exceeding
312 * the rmem limits. Reclaim the reserves and obey rmem limits again.
313 */
314 sk_mem_reclaim(sk);
315 }
316 EXPORT_SYMBOL_GPL(sk_clear_memalloc);
317
318 int __sk_backlog_rcv(struct sock *sk, struct sk_buff *skb)
319 {
320 int ret;
321 unsigned int noreclaim_flag;
322
323 /* these should have been dropped before queueing */
324 BUG_ON(!sock_flag(sk, SOCK_MEMALLOC));
325
326 noreclaim_flag = memalloc_noreclaim_save();
327 ret = sk->sk_backlog_rcv(sk, skb);
328 memalloc_noreclaim_restore(noreclaim_flag);
329
330 return ret;
331 }
332 EXPORT_SYMBOL(__sk_backlog_rcv);
333
334 static int sock_get_timeout(long timeo, void *optval, bool old_timeval)
335 {
336 struct __kernel_sock_timeval tv;
337
338 if (timeo == MAX_SCHEDULE_TIMEOUT) {
339 tv.tv_sec = 0;
340 tv.tv_usec = 0;
341 } else {
342 tv.tv_sec = timeo / HZ;
343 tv.tv_usec = ((timeo % HZ) * USEC_PER_SEC) / HZ;
344 }
345
346 if (old_timeval && in_compat_syscall() && !COMPAT_USE_64BIT_TIME) {
347 struct old_timeval32 tv32 = { tv.tv_sec, tv.tv_usec };
348 *(struct old_timeval32 *)optval = tv32;
349 return sizeof(tv32);
350 }
351
352 if (old_timeval) {
353 struct __kernel_old_timeval old_tv;
354 old_tv.tv_sec = tv.tv_sec;
355 old_tv.tv_usec = tv.tv_usec;
356 *(struct __kernel_old_timeval *)optval = old_tv;
357 return sizeof(old_tv);
358 }
359
360 *(struct __kernel_sock_timeval *)optval = tv;
361 return sizeof(tv);
362 }
363
364 static int sock_set_timeout(long *timeo_p, sockptr_t optval, int optlen,
365 bool old_timeval)
366 {
367 struct __kernel_sock_timeval tv;
368
369 if (old_timeval && in_compat_syscall() && !COMPAT_USE_64BIT_TIME) {
370 struct old_timeval32 tv32;
371
372 if (optlen < sizeof(tv32))
373 return -EINVAL;
374
375 if (copy_from_sockptr(&tv32, optval, sizeof(tv32)))
376 return -EFAULT;
377 tv.tv_sec = tv32.tv_sec;
378 tv.tv_usec = tv32.tv_usec;
379 } else if (old_timeval) {
380 struct __kernel_old_timeval old_tv;
381
382 if (optlen < sizeof(old_tv))
383 return -EINVAL;
384 if (copy_from_sockptr(&old_tv, optval, sizeof(old_tv)))
385 return -EFAULT;
386 tv.tv_sec = old_tv.tv_sec;
387 tv.tv_usec = old_tv.tv_usec;
388 } else {
389 if (optlen < sizeof(tv))
390 return -EINVAL;
391 if (copy_from_sockptr(&tv, optval, sizeof(tv)))
392 return -EFAULT;
393 }
394 if (tv.tv_usec < 0 || tv.tv_usec >= USEC_PER_SEC)
395 return -EDOM;
396
397 if (tv.tv_sec < 0) {
398 static int warned __read_mostly;
399
400 *timeo_p = 0;
401 if (warned < 10 && net_ratelimit()) {
402 warned++;
403 pr_info("%s: `%s' (pid %d) tries to set negative timeout\n",
404 __func__, current->comm, task_pid_nr(current));
405 }
406 return 0;
407 }
408 *timeo_p = MAX_SCHEDULE_TIMEOUT;
409 if (tv.tv_sec == 0 && tv.tv_usec == 0)
410 return 0;
411 if (tv.tv_sec < (MAX_SCHEDULE_TIMEOUT / HZ - 1))
412 *timeo_p = tv.tv_sec * HZ + DIV_ROUND_UP((unsigned long)tv.tv_usec, USEC_PER_SEC / HZ);
413 return 0;
414 }
415
416 static bool sock_needs_netstamp(const struct sock *sk)
417 {
418 switch (sk->sk_family) {
419 case AF_UNSPEC:
420 case AF_UNIX:
421 return false;
422 default:
423 return true;
424 }
425 }
426
427 static void sock_disable_timestamp(struct sock *sk, unsigned long flags)
428 {
429 if (sk->sk_flags & flags) {
430 sk->sk_flags &= ~flags;
431 if (sock_needs_netstamp(sk) &&
432 !(sk->sk_flags & SK_FLAGS_TIMESTAMP))
433 net_disable_timestamp();
434 }
435 }
436
437
438 int __sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
439 {
440 unsigned long flags;
441 struct sk_buff_head *list = &sk->sk_receive_queue;
442
443 if (atomic_read(&sk->sk_rmem_alloc) >= sk->sk_rcvbuf) {
444 atomic_inc(&sk->sk_drops);
445 trace_sock_rcvqueue_full(sk, skb);
446 return -ENOMEM;
447 }
448
449 if (!sk_rmem_schedule(sk, skb, skb->truesize)) {
450 atomic_inc(&sk->sk_drops);
451 return -ENOBUFS;
452 }
453
454 skb->dev = NULL;
455 skb_set_owner_r(skb, sk);
456
457 /* we escape from rcu protected region, make sure we dont leak
458 * a norefcounted dst
459 */
460 skb_dst_force(skb);
461
462 spin_lock_irqsave(&list->lock, flags);
463 sock_skb_set_dropcount(sk, skb);
464 __skb_queue_tail(list, skb);
465 spin_unlock_irqrestore(&list->lock, flags);
466
467 if (!sock_flag(sk, SOCK_DEAD))
468 sk->sk_data_ready(sk);
469 return 0;
470 }
471 EXPORT_SYMBOL(__sock_queue_rcv_skb);
472
473 int sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
474 {
475 int err;
476
477 err = sk_filter(sk, skb);
478 if (err)
479 return err;
480
481 return __sock_queue_rcv_skb(sk, skb);
482 }
483 EXPORT_SYMBOL(sock_queue_rcv_skb);
484
485 int __sk_receive_skb(struct sock *sk, struct sk_buff *skb,
486 const int nested, unsigned int trim_cap, bool refcounted)
487 {
488 int rc = NET_RX_SUCCESS;
489
490 if (sk_filter_trim_cap(sk, skb, trim_cap))
491 goto discard_and_relse;
492
493 skb->dev = NULL;
494
495 if (sk_rcvqueues_full(sk, sk->sk_rcvbuf)) {
496 atomic_inc(&sk->sk_drops);
497 goto discard_and_relse;
498 }
499 if (nested)
500 bh_lock_sock_nested(sk);
501 else
502 bh_lock_sock(sk);
503 if (!sock_owned_by_user(sk)) {
504 /*
505 * trylock + unlock semantics:
506 */
507 mutex_acquire(&sk->sk_lock.dep_map, 0, 1, _RET_IP_);
508
509 rc = sk_backlog_rcv(sk, skb);
510
511 mutex_release(&sk->sk_lock.dep_map, _RET_IP_);
512 } else if (sk_add_backlog(sk, skb, READ_ONCE(sk->sk_rcvbuf))) {
513 bh_unlock_sock(sk);
514 atomic_inc(&sk->sk_drops);
515 goto discard_and_relse;
516 }
517
518 bh_unlock_sock(sk);
519 out:
520 if (refcounted)
521 sock_put(sk);
522 return rc;
523 discard_and_relse:
524 kfree_skb(skb);
525 goto out;
526 }
527 EXPORT_SYMBOL(__sk_receive_skb);
528
529 struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie)
530 {
531 struct dst_entry *dst = __sk_dst_get(sk);
532
533 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
534 sk_tx_queue_clear(sk);
535 sk->sk_dst_pending_confirm = 0;
536 RCU_INIT_POINTER(sk->sk_dst_cache, NULL);
537 dst_release(dst);
538 return NULL;
539 }
540
541 return dst;
542 }
543 EXPORT_SYMBOL(__sk_dst_check);
544
545 struct dst_entry *sk_dst_check(struct sock *sk, u32 cookie)
546 {
547 struct dst_entry *dst = sk_dst_get(sk);
548
549 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
550 sk_dst_reset(sk);
551 dst_release(dst);
552 return NULL;
553 }
554
555 return dst;
556 }
557 EXPORT_SYMBOL(sk_dst_check);
558
559 static int sock_bindtoindex_locked(struct sock *sk, int ifindex)
560 {
561 int ret = -ENOPROTOOPT;
562 #ifdef CONFIG_NETDEVICES
563 struct net *net = sock_net(sk);
564
565 /* Sorry... */
566 ret = -EPERM;
567 if (sk->sk_bound_dev_if && !ns_capable(net->user_ns, CAP_NET_RAW))
568 goto out;
569
570 ret = -EINVAL;
571 if (ifindex < 0)
572 goto out;
573
574 sk->sk_bound_dev_if = ifindex;
575 if (sk->sk_prot->rehash)
576 sk->sk_prot->rehash(sk);
577 sk_dst_reset(sk);
578
579 ret = 0;
580
581 out:
582 #endif
583
584 return ret;
585 }
586
587 int sock_bindtoindex(struct sock *sk, int ifindex, bool lock_sk)
588 {
589 int ret;
590
591 if (lock_sk)
592 lock_sock(sk);
593 ret = sock_bindtoindex_locked(sk, ifindex);
594 if (lock_sk)
595 release_sock(sk);
596
597 return ret;
598 }
599 EXPORT_SYMBOL(sock_bindtoindex);
600
601 static int sock_setbindtodevice(struct sock *sk, sockptr_t optval, int optlen)
602 {
603 int ret = -ENOPROTOOPT;
604 #ifdef CONFIG_NETDEVICES
605 struct net *net = sock_net(sk);
606 char devname[IFNAMSIZ];
607 int index;
608
609 ret = -EINVAL;
610 if (optlen < 0)
611 goto out;
612
613 /* Bind this socket to a particular device like "eth0",
614 * as specified in the passed interface name. If the
615 * name is "" or the option length is zero the socket
616 * is not bound.
617 */
618 if (optlen > IFNAMSIZ - 1)
619 optlen = IFNAMSIZ - 1;
620 memset(devname, 0, sizeof(devname));
621
622 ret = -EFAULT;
623 if (copy_from_sockptr(devname, optval, optlen))
624 goto out;
625
626 index = 0;
627 if (devname[0] != '\0') {
628 struct net_device *dev;
629
630 rcu_read_lock();
631 dev = dev_get_by_name_rcu(net, devname);
632 if (dev)
633 index = dev->ifindex;
634 rcu_read_unlock();
635 ret = -ENODEV;
636 if (!dev)
637 goto out;
638 }
639
640 return sock_bindtoindex(sk, index, true);
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 bool sk_mc_loop(struct sock *sk)
688 {
689 if (dev_recursion_level())
690 return false;
691 if (!sk)
692 return true;
693 switch (sk->sk_family) {
694 case AF_INET:
695 return inet_sk(sk)->mc_loop;
696 #if IS_ENABLED(CONFIG_IPV6)
697 case AF_INET6:
698 return inet6_sk(sk)->mc_loop;
699 #endif
700 }
701 WARN_ON_ONCE(1);
702 return true;
703 }
704 EXPORT_SYMBOL(sk_mc_loop);
705
706 void sock_set_reuseaddr(struct sock *sk)
707 {
708 lock_sock(sk);
709 sk->sk_reuse = SK_CAN_REUSE;
710 release_sock(sk);
711 }
712 EXPORT_SYMBOL(sock_set_reuseaddr);
713
714 void sock_set_reuseport(struct sock *sk)
715 {
716 lock_sock(sk);
717 sk->sk_reuseport = true;
718 release_sock(sk);
719 }
720 EXPORT_SYMBOL(sock_set_reuseport);
721
722 void sock_no_linger(struct sock *sk)
723 {
724 lock_sock(sk);
725 sk->sk_lingertime = 0;
726 sock_set_flag(sk, SOCK_LINGER);
727 release_sock(sk);
728 }
729 EXPORT_SYMBOL(sock_no_linger);
730
731 void sock_set_priority(struct sock *sk, u32 priority)
732 {
733 lock_sock(sk);
734 sk->sk_priority = priority;
735 release_sock(sk);
736 }
737 EXPORT_SYMBOL(sock_set_priority);
738
739 void sock_set_sndtimeo(struct sock *sk, s64 secs)
740 {
741 lock_sock(sk);
742 if (secs && secs < MAX_SCHEDULE_TIMEOUT / HZ - 1)
743 sk->sk_sndtimeo = secs * HZ;
744 else
745 sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT;
746 release_sock(sk);
747 }
748 EXPORT_SYMBOL(sock_set_sndtimeo);
749
750 static void __sock_set_timestamps(struct sock *sk, bool val, bool new, bool ns)
751 {
752 if (val) {
753 sock_valbool_flag(sk, SOCK_TSTAMP_NEW, new);
754 sock_valbool_flag(sk, SOCK_RCVTSTAMPNS, ns);
755 sock_set_flag(sk, SOCK_RCVTSTAMP);
756 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
757 } else {
758 sock_reset_flag(sk, SOCK_RCVTSTAMP);
759 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
760 }
761 }
762
763 void sock_enable_timestamps(struct sock *sk)
764 {
765 lock_sock(sk);
766 __sock_set_timestamps(sk, true, false, true);
767 release_sock(sk);
768 }
769 EXPORT_SYMBOL(sock_enable_timestamps);
770
771 void sock_set_keepalive(struct sock *sk)
772 {
773 lock_sock(sk);
774 if (sk->sk_prot->keepalive)
775 sk->sk_prot->keepalive(sk, true);
776 sock_valbool_flag(sk, SOCK_KEEPOPEN, true);
777 release_sock(sk);
778 }
779 EXPORT_SYMBOL(sock_set_keepalive);
780
781 static void __sock_set_rcvbuf(struct sock *sk, int val)
782 {
783 /* Ensure val * 2 fits into an int, to prevent max_t() from treating it
784 * as a negative value.
785 */
786 val = min_t(int, val, INT_MAX / 2);
787 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
788
789 /* We double it on the way in to account for "struct sk_buff" etc.
790 * overhead. Applications assume that the SO_RCVBUF setting they make
791 * will allow that much actual data to be received on that socket.
792 *
793 * Applications are unaware that "struct sk_buff" and other overheads
794 * allocate from the receive buffer during socket buffer allocation.
795 *
796 * And after considering the possible alternatives, returning the value
797 * we actually used in getsockopt is the most desirable behavior.
798 */
799 WRITE_ONCE(sk->sk_rcvbuf, max_t(int, val * 2, SOCK_MIN_RCVBUF));
800 }
801
802 void sock_set_rcvbuf(struct sock *sk, int val)
803 {
804 lock_sock(sk);
805 __sock_set_rcvbuf(sk, val);
806 release_sock(sk);
807 }
808 EXPORT_SYMBOL(sock_set_rcvbuf);
809
810 void sock_set_mark(struct sock *sk, u32 val)
811 {
812 lock_sock(sk);
813 sk->sk_mark = val;
814 release_sock(sk);
815 }
816 EXPORT_SYMBOL(sock_set_mark);
817
818 /*
819 * This is meant for all protocols to use and covers goings on
820 * at the socket level. Everything here is generic.
821 */
822
823 int sock_setsockopt(struct socket *sock, int level, int optname,
824 sockptr_t optval, unsigned int optlen)
825 {
826 struct sock_txtime sk_txtime;
827 struct sock *sk = sock->sk;
828 int val;
829 int valbool;
830 struct linger ling;
831 int ret = 0;
832
833 /*
834 * Options without arguments
835 */
836
837 if (optname == SO_BINDTODEVICE)
838 return sock_setbindtodevice(sk, optval, optlen);
839
840 if (optlen < sizeof(int))
841 return -EINVAL;
842
843 if (copy_from_sockptr(&val, optval, sizeof(val)))
844 return -EFAULT;
845
846 valbool = val ? 1 : 0;
847
848 lock_sock(sk);
849
850 switch (optname) {
851 case SO_DEBUG:
852 if (val && !capable(CAP_NET_ADMIN))
853 ret = -EACCES;
854 else
855 sock_valbool_flag(sk, SOCK_DBG, valbool);
856 break;
857 case SO_REUSEADDR:
858 sk->sk_reuse = (valbool ? SK_CAN_REUSE : SK_NO_REUSE);
859 break;
860 case SO_REUSEPORT:
861 sk->sk_reuseport = valbool;
862 break;
863 case SO_TYPE:
864 case SO_PROTOCOL:
865 case SO_DOMAIN:
866 case SO_ERROR:
867 ret = -ENOPROTOOPT;
868 break;
869 case SO_DONTROUTE:
870 sock_valbool_flag(sk, SOCK_LOCALROUTE, valbool);
871 sk_dst_reset(sk);
872 break;
873 case SO_BROADCAST:
874 sock_valbool_flag(sk, SOCK_BROADCAST, valbool);
875 break;
876 case SO_SNDBUF:
877 /* Don't error on this BSD doesn't and if you think
878 * about it this is right. Otherwise apps have to
879 * play 'guess the biggest size' games. RCVBUF/SNDBUF
880 * are treated in BSD as hints
881 */
882 val = min_t(u32, val, sysctl_wmem_max);
883 set_sndbuf:
884 /* Ensure val * 2 fits into an int, to prevent max_t()
885 * from treating it as a negative value.
886 */
887 val = min_t(int, val, INT_MAX / 2);
888 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
889 WRITE_ONCE(sk->sk_sndbuf,
890 max_t(int, val * 2, SOCK_MIN_SNDBUF));
891 /* Wake up sending tasks if we upped the value. */
892 sk->sk_write_space(sk);
893 break;
894
895 case SO_SNDBUFFORCE:
896 if (!capable(CAP_NET_ADMIN)) {
897 ret = -EPERM;
898 break;
899 }
900
901 /* No negative values (to prevent underflow, as val will be
902 * multiplied by 2).
903 */
904 if (val < 0)
905 val = 0;
906 goto set_sndbuf;
907
908 case SO_RCVBUF:
909 /* Don't error on this BSD doesn't and if you think
910 * about it this is right. Otherwise apps have to
911 * play 'guess the biggest size' games. RCVBUF/SNDBUF
912 * are treated in BSD as hints
913 */
914 __sock_set_rcvbuf(sk, min_t(u32, val, sysctl_rmem_max));
915 break;
916
917 case SO_RCVBUFFORCE:
918 if (!capable(CAP_NET_ADMIN)) {
919 ret = -EPERM;
920 break;
921 }
922
923 /* No negative values (to prevent underflow, as val will be
924 * multiplied by 2).
925 */
926 __sock_set_rcvbuf(sk, max(val, 0));
927 break;
928
929 case SO_KEEPALIVE:
930 if (sk->sk_prot->keepalive)
931 sk->sk_prot->keepalive(sk, valbool);
932 sock_valbool_flag(sk, SOCK_KEEPOPEN, valbool);
933 break;
934
935 case SO_OOBINLINE:
936 sock_valbool_flag(sk, SOCK_URGINLINE, valbool);
937 break;
938
939 case SO_NO_CHECK:
940 sk->sk_no_check_tx = valbool;
941 break;
942
943 case SO_PRIORITY:
944 if ((val >= 0 && val <= 6) ||
945 ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
946 sk->sk_priority = val;
947 else
948 ret = -EPERM;
949 break;
950
951 case SO_LINGER:
952 if (optlen < sizeof(ling)) {
953 ret = -EINVAL; /* 1003.1g */
954 break;
955 }
956 if (copy_from_sockptr(&ling, optval, sizeof(ling))) {
957 ret = -EFAULT;
958 break;
959 }
960 if (!ling.l_onoff)
961 sock_reset_flag(sk, SOCK_LINGER);
962 else {
963 #if (BITS_PER_LONG == 32)
964 if ((unsigned int)ling.l_linger >= MAX_SCHEDULE_TIMEOUT/HZ)
965 sk->sk_lingertime = MAX_SCHEDULE_TIMEOUT;
966 else
967 #endif
968 sk->sk_lingertime = (unsigned int)ling.l_linger * HZ;
969 sock_set_flag(sk, SOCK_LINGER);
970 }
971 break;
972
973 case SO_BSDCOMPAT:
974 break;
975
976 case SO_PASSCRED:
977 if (valbool)
978 set_bit(SOCK_PASSCRED, &sock->flags);
979 else
980 clear_bit(SOCK_PASSCRED, &sock->flags);
981 break;
982
983 case SO_TIMESTAMP_OLD:
984 __sock_set_timestamps(sk, valbool, false, false);
985 break;
986 case SO_TIMESTAMP_NEW:
987 __sock_set_timestamps(sk, valbool, true, false);
988 break;
989 case SO_TIMESTAMPNS_OLD:
990 __sock_set_timestamps(sk, valbool, false, true);
991 break;
992 case SO_TIMESTAMPNS_NEW:
993 __sock_set_timestamps(sk, valbool, true, true);
994 break;
995 case SO_TIMESTAMPING_NEW:
996 case SO_TIMESTAMPING_OLD:
997 if (val & ~SOF_TIMESTAMPING_MASK) {
998 ret = -EINVAL;
999 break;
1000 }
1001
1002 if (val & SOF_TIMESTAMPING_OPT_ID &&
1003 !(sk->sk_tsflags & SOF_TIMESTAMPING_OPT_ID)) {
1004 if (sk->sk_protocol == IPPROTO_TCP &&
1005 sk->sk_type == SOCK_STREAM) {
1006 if ((1 << sk->sk_state) &
1007 (TCPF_CLOSE | TCPF_LISTEN)) {
1008 ret = -EINVAL;
1009 break;
1010 }
1011 sk->sk_tskey = tcp_sk(sk)->snd_una;
1012 } else {
1013 sk->sk_tskey = 0;
1014 }
1015 }
1016
1017 if (val & SOF_TIMESTAMPING_OPT_STATS &&
1018 !(val & SOF_TIMESTAMPING_OPT_TSONLY)) {
1019 ret = -EINVAL;
1020 break;
1021 }
1022
1023 sk->sk_tsflags = val;
1024 sock_valbool_flag(sk, SOCK_TSTAMP_NEW, optname == SO_TIMESTAMPING_NEW);
1025
1026 if (val & SOF_TIMESTAMPING_RX_SOFTWARE)
1027 sock_enable_timestamp(sk,
1028 SOCK_TIMESTAMPING_RX_SOFTWARE);
1029 else
1030 sock_disable_timestamp(sk,
1031 (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE));
1032 break;
1033
1034 case SO_RCVLOWAT:
1035 if (val < 0)
1036 val = INT_MAX;
1037 if (sock->ops->set_rcvlowat)
1038 ret = sock->ops->set_rcvlowat(sk, val);
1039 else
1040 WRITE_ONCE(sk->sk_rcvlowat, val ? : 1);
1041 break;
1042
1043 case SO_RCVTIMEO_OLD:
1044 case SO_RCVTIMEO_NEW:
1045 ret = sock_set_timeout(&sk->sk_rcvtimeo, optval,
1046 optlen, optname == SO_RCVTIMEO_OLD);
1047 break;
1048
1049 case SO_SNDTIMEO_OLD:
1050 case SO_SNDTIMEO_NEW:
1051 ret = sock_set_timeout(&sk->sk_sndtimeo, optval,
1052 optlen, optname == SO_SNDTIMEO_OLD);
1053 break;
1054
1055 case SO_ATTACH_FILTER: {
1056 struct sock_fprog fprog;
1057
1058 ret = copy_bpf_fprog_from_user(&fprog, optval, optlen);
1059 if (!ret)
1060 ret = sk_attach_filter(&fprog, sk);
1061 break;
1062 }
1063 case SO_ATTACH_BPF:
1064 ret = -EINVAL;
1065 if (optlen == sizeof(u32)) {
1066 u32 ufd;
1067
1068 ret = -EFAULT;
1069 if (copy_from_sockptr(&ufd, optval, sizeof(ufd)))
1070 break;
1071
1072 ret = sk_attach_bpf(ufd, sk);
1073 }
1074 break;
1075
1076 case SO_ATTACH_REUSEPORT_CBPF: {
1077 struct sock_fprog fprog;
1078
1079 ret = copy_bpf_fprog_from_user(&fprog, optval, optlen);
1080 if (!ret)
1081 ret = sk_reuseport_attach_filter(&fprog, sk);
1082 break;
1083 }
1084 case SO_ATTACH_REUSEPORT_EBPF:
1085 ret = -EINVAL;
1086 if (optlen == sizeof(u32)) {
1087 u32 ufd;
1088
1089 ret = -EFAULT;
1090 if (copy_from_sockptr(&ufd, optval, sizeof(ufd)))
1091 break;
1092
1093 ret = sk_reuseport_attach_bpf(ufd, sk);
1094 }
1095 break;
1096
1097 case SO_DETACH_REUSEPORT_BPF:
1098 ret = reuseport_detach_prog(sk);
1099 break;
1100
1101 case SO_DETACH_FILTER:
1102 ret = sk_detach_filter(sk);
1103 break;
1104
1105 case SO_LOCK_FILTER:
1106 if (sock_flag(sk, SOCK_FILTER_LOCKED) && !valbool)
1107 ret = -EPERM;
1108 else
1109 sock_valbool_flag(sk, SOCK_FILTER_LOCKED, valbool);
1110 break;
1111
1112 case SO_PASSSEC:
1113 if (valbool)
1114 set_bit(SOCK_PASSSEC, &sock->flags);
1115 else
1116 clear_bit(SOCK_PASSSEC, &sock->flags);
1117 break;
1118 case SO_MARK:
1119 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) {
1120 ret = -EPERM;
1121 } else if (val != sk->sk_mark) {
1122 sk->sk_mark = val;
1123 sk_dst_reset(sk);
1124 }
1125 break;
1126
1127 case SO_RXQ_OVFL:
1128 sock_valbool_flag(sk, SOCK_RXQ_OVFL, valbool);
1129 break;
1130
1131 case SO_WIFI_STATUS:
1132 sock_valbool_flag(sk, SOCK_WIFI_STATUS, valbool);
1133 break;
1134
1135 case SO_PEEK_OFF:
1136 if (sock->ops->set_peek_off)
1137 ret = sock->ops->set_peek_off(sk, val);
1138 else
1139 ret = -EOPNOTSUPP;
1140 break;
1141
1142 case SO_NOFCS:
1143 sock_valbool_flag(sk, SOCK_NOFCS, valbool);
1144 break;
1145
1146 case SO_SELECT_ERR_QUEUE:
1147 sock_valbool_flag(sk, SOCK_SELECT_ERR_QUEUE, valbool);
1148 break;
1149
1150 #ifdef CONFIG_NET_RX_BUSY_POLL
1151 case SO_BUSY_POLL:
1152 /* allow unprivileged users to decrease the value */
1153 if ((val > sk->sk_ll_usec) && !capable(CAP_NET_ADMIN))
1154 ret = -EPERM;
1155 else {
1156 if (val < 0)
1157 ret = -EINVAL;
1158 else
1159 sk->sk_ll_usec = val;
1160 }
1161 break;
1162 case SO_PREFER_BUSY_POLL:
1163 if (valbool && !capable(CAP_NET_ADMIN))
1164 ret = -EPERM;
1165 else
1166 WRITE_ONCE(sk->sk_prefer_busy_poll, valbool);
1167 break;
1168 case SO_BUSY_POLL_BUDGET:
1169 if (val > READ_ONCE(sk->sk_busy_poll_budget) && !capable(CAP_NET_ADMIN)) {
1170 ret = -EPERM;
1171 } else {
1172 if (val < 0 || val > U16_MAX)
1173 ret = -EINVAL;
1174 else
1175 WRITE_ONCE(sk->sk_busy_poll_budget, val);
1176 }
1177 break;
1178 #endif
1179
1180 case SO_MAX_PACING_RATE:
1181 {
1182 unsigned long ulval = (val == ~0U) ? ~0UL : (unsigned int)val;
1183
1184 if (sizeof(ulval) != sizeof(val) &&
1185 optlen >= sizeof(ulval) &&
1186 copy_from_sockptr(&ulval, optval, sizeof(ulval))) {
1187 ret = -EFAULT;
1188 break;
1189 }
1190 if (ulval != ~0UL)
1191 cmpxchg(&sk->sk_pacing_status,
1192 SK_PACING_NONE,
1193 SK_PACING_NEEDED);
1194 sk->sk_max_pacing_rate = ulval;
1195 sk->sk_pacing_rate = min(sk->sk_pacing_rate, ulval);
1196 break;
1197 }
1198 case SO_INCOMING_CPU:
1199 WRITE_ONCE(sk->sk_incoming_cpu, val);
1200 break;
1201
1202 case SO_CNX_ADVICE:
1203 if (val == 1)
1204 dst_negative_advice(sk);
1205 break;
1206
1207 case SO_ZEROCOPY:
1208 if (sk->sk_family == PF_INET || sk->sk_family == PF_INET6) {
1209 if (!((sk->sk_type == SOCK_STREAM &&
1210 sk->sk_protocol == IPPROTO_TCP) ||
1211 (sk->sk_type == SOCK_DGRAM &&
1212 sk->sk_protocol == IPPROTO_UDP)))
1213 ret = -ENOTSUPP;
1214 } else if (sk->sk_family != PF_RDS) {
1215 ret = -ENOTSUPP;
1216 }
1217 if (!ret) {
1218 if (val < 0 || val > 1)
1219 ret = -EINVAL;
1220 else
1221 sock_valbool_flag(sk, SOCK_ZEROCOPY, valbool);
1222 }
1223 break;
1224
1225 case SO_TXTIME:
1226 if (optlen != sizeof(struct sock_txtime)) {
1227 ret = -EINVAL;
1228 break;
1229 } else if (copy_from_sockptr(&sk_txtime, optval,
1230 sizeof(struct sock_txtime))) {
1231 ret = -EFAULT;
1232 break;
1233 } else if (sk_txtime.flags & ~SOF_TXTIME_FLAGS_MASK) {
1234 ret = -EINVAL;
1235 break;
1236 }
1237 /* CLOCK_MONOTONIC is only used by sch_fq, and this packet
1238 * scheduler has enough safe guards.
1239 */
1240 if (sk_txtime.clockid != CLOCK_MONOTONIC &&
1241 !ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) {
1242 ret = -EPERM;
1243 break;
1244 }
1245 sock_valbool_flag(sk, SOCK_TXTIME, true);
1246 sk->sk_clockid = sk_txtime.clockid;
1247 sk->sk_txtime_deadline_mode =
1248 !!(sk_txtime.flags & SOF_TXTIME_DEADLINE_MODE);
1249 sk->sk_txtime_report_errors =
1250 !!(sk_txtime.flags & SOF_TXTIME_REPORT_ERRORS);
1251 break;
1252
1253 case SO_BINDTOIFINDEX:
1254 ret = sock_bindtoindex_locked(sk, val);
1255 break;
1256
1257 default:
1258 ret = -ENOPROTOOPT;
1259 break;
1260 }
1261 release_sock(sk);
1262 return ret;
1263 }
1264 EXPORT_SYMBOL(sock_setsockopt);
1265
1266
1267 static void cred_to_ucred(struct pid *pid, const struct cred *cred,
1268 struct ucred *ucred)
1269 {
1270 ucred->pid = pid_vnr(pid);
1271 ucred->uid = ucred->gid = -1;
1272 if (cred) {
1273 struct user_namespace *current_ns = current_user_ns();
1274
1275 ucred->uid = from_kuid_munged(current_ns, cred->euid);
1276 ucred->gid = from_kgid_munged(current_ns, cred->egid);
1277 }
1278 }
1279
1280 static int groups_to_user(gid_t __user *dst, const struct group_info *src)
1281 {
1282 struct user_namespace *user_ns = current_user_ns();
1283 int i;
1284
1285 for (i = 0; i < src->ngroups; i++)
1286 if (put_user(from_kgid_munged(user_ns, src->gid[i]), dst + i))
1287 return -EFAULT;
1288
1289 return 0;
1290 }
1291
1292 int sock_getsockopt(struct socket *sock, int level, int optname,
1293 char __user *optval, int __user *optlen)
1294 {
1295 struct sock *sk = sock->sk;
1296
1297 union {
1298 int val;
1299 u64 val64;
1300 unsigned long ulval;
1301 struct linger ling;
1302 struct old_timeval32 tm32;
1303 struct __kernel_old_timeval tm;
1304 struct __kernel_sock_timeval stm;
1305 struct sock_txtime txtime;
1306 } v;
1307
1308 int lv = sizeof(int);
1309 int len;
1310
1311 if (get_user(len, optlen))
1312 return -EFAULT;
1313 if (len < 0)
1314 return -EINVAL;
1315
1316 memset(&v, 0, sizeof(v));
1317
1318 switch (optname) {
1319 case SO_DEBUG:
1320 v.val = sock_flag(sk, SOCK_DBG);
1321 break;
1322
1323 case SO_DONTROUTE:
1324 v.val = sock_flag(sk, SOCK_LOCALROUTE);
1325 break;
1326
1327 case SO_BROADCAST:
1328 v.val = sock_flag(sk, SOCK_BROADCAST);
1329 break;
1330
1331 case SO_SNDBUF:
1332 v.val = sk->sk_sndbuf;
1333 break;
1334
1335 case SO_RCVBUF:
1336 v.val = sk->sk_rcvbuf;
1337 break;
1338
1339 case SO_REUSEADDR:
1340 v.val = sk->sk_reuse;
1341 break;
1342
1343 case SO_REUSEPORT:
1344 v.val = sk->sk_reuseport;
1345 break;
1346
1347 case SO_KEEPALIVE:
1348 v.val = sock_flag(sk, SOCK_KEEPOPEN);
1349 break;
1350
1351 case SO_TYPE:
1352 v.val = sk->sk_type;
1353 break;
1354
1355 case SO_PROTOCOL:
1356 v.val = sk->sk_protocol;
1357 break;
1358
1359 case SO_DOMAIN:
1360 v.val = sk->sk_family;
1361 break;
1362
1363 case SO_ERROR:
1364 v.val = -sock_error(sk);
1365 if (v.val == 0)
1366 v.val = xchg(&sk->sk_err_soft, 0);
1367 break;
1368
1369 case SO_OOBINLINE:
1370 v.val = sock_flag(sk, SOCK_URGINLINE);
1371 break;
1372
1373 case SO_NO_CHECK:
1374 v.val = sk->sk_no_check_tx;
1375 break;
1376
1377 case SO_PRIORITY:
1378 v.val = sk->sk_priority;
1379 break;
1380
1381 case SO_LINGER:
1382 lv = sizeof(v.ling);
1383 v.ling.l_onoff = sock_flag(sk, SOCK_LINGER);
1384 v.ling.l_linger = sk->sk_lingertime / HZ;
1385 break;
1386
1387 case SO_BSDCOMPAT:
1388 break;
1389
1390 case SO_TIMESTAMP_OLD:
1391 v.val = sock_flag(sk, SOCK_RCVTSTAMP) &&
1392 !sock_flag(sk, SOCK_TSTAMP_NEW) &&
1393 !sock_flag(sk, SOCK_RCVTSTAMPNS);
1394 break;
1395
1396 case SO_TIMESTAMPNS_OLD:
1397 v.val = sock_flag(sk, SOCK_RCVTSTAMPNS) && !sock_flag(sk, SOCK_TSTAMP_NEW);
1398 break;
1399
1400 case SO_TIMESTAMP_NEW:
1401 v.val = sock_flag(sk, SOCK_RCVTSTAMP) && sock_flag(sk, SOCK_TSTAMP_NEW);
1402 break;
1403
1404 case SO_TIMESTAMPNS_NEW:
1405 v.val = sock_flag(sk, SOCK_RCVTSTAMPNS) && sock_flag(sk, SOCK_TSTAMP_NEW);
1406 break;
1407
1408 case SO_TIMESTAMPING_OLD:
1409 v.val = sk->sk_tsflags;
1410 break;
1411
1412 case SO_RCVTIMEO_OLD:
1413 case SO_RCVTIMEO_NEW:
1414 lv = sock_get_timeout(sk->sk_rcvtimeo, &v, SO_RCVTIMEO_OLD == optname);
1415 break;
1416
1417 case SO_SNDTIMEO_OLD:
1418 case SO_SNDTIMEO_NEW:
1419 lv = sock_get_timeout(sk->sk_sndtimeo, &v, SO_SNDTIMEO_OLD == optname);
1420 break;
1421
1422 case SO_RCVLOWAT:
1423 v.val = sk->sk_rcvlowat;
1424 break;
1425
1426 case SO_SNDLOWAT:
1427 v.val = 1;
1428 break;
1429
1430 case SO_PASSCRED:
1431 v.val = !!test_bit(SOCK_PASSCRED, &sock->flags);
1432 break;
1433
1434 case SO_PEERCRED:
1435 {
1436 struct ucred peercred;
1437 if (len > sizeof(peercred))
1438 len = sizeof(peercred);
1439 cred_to_ucred(sk->sk_peer_pid, sk->sk_peer_cred, &peercred);
1440 if (copy_to_user(optval, &peercred, len))
1441 return -EFAULT;
1442 goto lenout;
1443 }
1444
1445 case SO_PEERGROUPS:
1446 {
1447 int ret, n;
1448
1449 if (!sk->sk_peer_cred)
1450 return -ENODATA;
1451
1452 n = sk->sk_peer_cred->group_info->ngroups;
1453 if (len < n * sizeof(gid_t)) {
1454 len = n * sizeof(gid_t);
1455 return put_user(len, optlen) ? -EFAULT : -ERANGE;
1456 }
1457 len = n * sizeof(gid_t);
1458
1459 ret = groups_to_user((gid_t __user *)optval,
1460 sk->sk_peer_cred->group_info);
1461 if (ret)
1462 return ret;
1463 goto lenout;
1464 }
1465
1466 case SO_PEERNAME:
1467 {
1468 char address[128];
1469
1470 lv = sock->ops->getname(sock, (struct sockaddr *)address, 2);
1471 if (lv < 0)
1472 return -ENOTCONN;
1473 if (lv < len)
1474 return -EINVAL;
1475 if (copy_to_user(optval, address, len))
1476 return -EFAULT;
1477 goto lenout;
1478 }
1479
1480 /* Dubious BSD thing... Probably nobody even uses it, but
1481 * the UNIX standard wants it for whatever reason... -DaveM
1482 */
1483 case SO_ACCEPTCONN:
1484 v.val = sk->sk_state == TCP_LISTEN;
1485 break;
1486
1487 case SO_PASSSEC:
1488 v.val = !!test_bit(SOCK_PASSSEC, &sock->flags);
1489 break;
1490
1491 case SO_PEERSEC:
1492 return security_socket_getpeersec_stream(sock, optval, optlen, len);
1493
1494 case SO_MARK:
1495 v.val = sk->sk_mark;
1496 break;
1497
1498 case SO_RXQ_OVFL:
1499 v.val = sock_flag(sk, SOCK_RXQ_OVFL);
1500 break;
1501
1502 case SO_WIFI_STATUS:
1503 v.val = sock_flag(sk, SOCK_WIFI_STATUS);
1504 break;
1505
1506 case SO_PEEK_OFF:
1507 if (!sock->ops->set_peek_off)
1508 return -EOPNOTSUPP;
1509
1510 v.val = sk->sk_peek_off;
1511 break;
1512 case SO_NOFCS:
1513 v.val = sock_flag(sk, SOCK_NOFCS);
1514 break;
1515
1516 case SO_BINDTODEVICE:
1517 return sock_getbindtodevice(sk, optval, optlen, len);
1518
1519 case SO_GET_FILTER:
1520 len = sk_get_filter(sk, (struct sock_filter __user *)optval, len);
1521 if (len < 0)
1522 return len;
1523
1524 goto lenout;
1525
1526 case SO_LOCK_FILTER:
1527 v.val = sock_flag(sk, SOCK_FILTER_LOCKED);
1528 break;
1529
1530 case SO_BPF_EXTENSIONS:
1531 v.val = bpf_tell_extensions();
1532 break;
1533
1534 case SO_SELECT_ERR_QUEUE:
1535 v.val = sock_flag(sk, SOCK_SELECT_ERR_QUEUE);
1536 break;
1537
1538 #ifdef CONFIG_NET_RX_BUSY_POLL
1539 case SO_BUSY_POLL:
1540 v.val = sk->sk_ll_usec;
1541 break;
1542 case SO_PREFER_BUSY_POLL:
1543 v.val = READ_ONCE(sk->sk_prefer_busy_poll);
1544 break;
1545 #endif
1546
1547 case SO_MAX_PACING_RATE:
1548 if (sizeof(v.ulval) != sizeof(v.val) && len >= sizeof(v.ulval)) {
1549 lv = sizeof(v.ulval);
1550 v.ulval = sk->sk_max_pacing_rate;
1551 } else {
1552 /* 32bit version */
1553 v.val = min_t(unsigned long, sk->sk_max_pacing_rate, ~0U);
1554 }
1555 break;
1556
1557 case SO_INCOMING_CPU:
1558 v.val = READ_ONCE(sk->sk_incoming_cpu);
1559 break;
1560
1561 case SO_MEMINFO:
1562 {
1563 u32 meminfo[SK_MEMINFO_VARS];
1564
1565 sk_get_meminfo(sk, meminfo);
1566
1567 len = min_t(unsigned int, len, sizeof(meminfo));
1568 if (copy_to_user(optval, &meminfo, len))
1569 return -EFAULT;
1570
1571 goto lenout;
1572 }
1573
1574 #ifdef CONFIG_NET_RX_BUSY_POLL
1575 case SO_INCOMING_NAPI_ID:
1576 v.val = READ_ONCE(sk->sk_napi_id);
1577
1578 /* aggregate non-NAPI IDs down to 0 */
1579 if (v.val < MIN_NAPI_ID)
1580 v.val = 0;
1581
1582 break;
1583 #endif
1584
1585 case SO_COOKIE:
1586 lv = sizeof(u64);
1587 if (len < lv)
1588 return -EINVAL;
1589 v.val64 = sock_gen_cookie(sk);
1590 break;
1591
1592 case SO_ZEROCOPY:
1593 v.val = sock_flag(sk, SOCK_ZEROCOPY);
1594 break;
1595
1596 case SO_TXTIME:
1597 lv = sizeof(v.txtime);
1598 v.txtime.clockid = sk->sk_clockid;
1599 v.txtime.flags |= sk->sk_txtime_deadline_mode ?
1600 SOF_TXTIME_DEADLINE_MODE : 0;
1601 v.txtime.flags |= sk->sk_txtime_report_errors ?
1602 SOF_TXTIME_REPORT_ERRORS : 0;
1603 break;
1604
1605 case SO_BINDTOIFINDEX:
1606 v.val = sk->sk_bound_dev_if;
1607 break;
1608
1609 default:
1610 /* We implement the SO_SNDLOWAT etc to not be settable
1611 * (1003.1g 7).
1612 */
1613 return -ENOPROTOOPT;
1614 }
1615
1616 if (len > lv)
1617 len = lv;
1618 if (copy_to_user(optval, &v, len))
1619 return -EFAULT;
1620 lenout:
1621 if (put_user(len, optlen))
1622 return -EFAULT;
1623 return 0;
1624 }
1625
1626 /*
1627 * Initialize an sk_lock.
1628 *
1629 * (We also register the sk_lock with the lock validator.)
1630 */
1631 static inline void sock_lock_init(struct sock *sk)
1632 {
1633 if (sk->sk_kern_sock)
1634 sock_lock_init_class_and_name(
1635 sk,
1636 af_family_kern_slock_key_strings[sk->sk_family],
1637 af_family_kern_slock_keys + sk->sk_family,
1638 af_family_kern_key_strings[sk->sk_family],
1639 af_family_kern_keys + sk->sk_family);
1640 else
1641 sock_lock_init_class_and_name(
1642 sk,
1643 af_family_slock_key_strings[sk->sk_family],
1644 af_family_slock_keys + sk->sk_family,
1645 af_family_key_strings[sk->sk_family],
1646 af_family_keys + sk->sk_family);
1647 }
1648
1649 /*
1650 * Copy all fields from osk to nsk but nsk->sk_refcnt must not change yet,
1651 * even temporarly, because of RCU lookups. sk_node should also be left as is.
1652 * We must not copy fields between sk_dontcopy_begin and sk_dontcopy_end
1653 */
1654 static void sock_copy(struct sock *nsk, const struct sock *osk)
1655 {
1656 const struct proto *prot = READ_ONCE(osk->sk_prot);
1657 #ifdef CONFIG_SECURITY_NETWORK
1658 void *sptr = nsk->sk_security;
1659 #endif
1660 memcpy(nsk, osk, offsetof(struct sock, sk_dontcopy_begin));
1661
1662 memcpy(&nsk->sk_dontcopy_end, &osk->sk_dontcopy_end,
1663 prot->obj_size - offsetof(struct sock, sk_dontcopy_end));
1664
1665 #ifdef CONFIG_SECURITY_NETWORK
1666 nsk->sk_security = sptr;
1667 security_sk_clone(osk, nsk);
1668 #endif
1669 }
1670
1671 static struct sock *sk_prot_alloc(struct proto *prot, gfp_t priority,
1672 int family)
1673 {
1674 struct sock *sk;
1675 struct kmem_cache *slab;
1676
1677 slab = prot->slab;
1678 if (slab != NULL) {
1679 sk = kmem_cache_alloc(slab, priority & ~__GFP_ZERO);
1680 if (!sk)
1681 return sk;
1682 if (want_init_on_alloc(priority))
1683 sk_prot_clear_nulls(sk, prot->obj_size);
1684 } else
1685 sk = kmalloc(prot->obj_size, priority);
1686
1687 if (sk != NULL) {
1688 if (security_sk_alloc(sk, family, priority))
1689 goto out_free;
1690
1691 if (!try_module_get(prot->owner))
1692 goto out_free_sec;
1693 sk_tx_queue_clear(sk);
1694 }
1695
1696 return sk;
1697
1698 out_free_sec:
1699 security_sk_free(sk);
1700 out_free:
1701 if (slab != NULL)
1702 kmem_cache_free(slab, sk);
1703 else
1704 kfree(sk);
1705 return NULL;
1706 }
1707
1708 static void sk_prot_free(struct proto *prot, struct sock *sk)
1709 {
1710 struct kmem_cache *slab;
1711 struct module *owner;
1712
1713 owner = prot->owner;
1714 slab = prot->slab;
1715
1716 cgroup_sk_free(&sk->sk_cgrp_data);
1717 mem_cgroup_sk_free(sk);
1718 security_sk_free(sk);
1719 if (slab != NULL)
1720 kmem_cache_free(slab, sk);
1721 else
1722 kfree(sk);
1723 module_put(owner);
1724 }
1725
1726 /**
1727 * sk_alloc - All socket objects are allocated here
1728 * @net: the applicable net namespace
1729 * @family: protocol family
1730 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
1731 * @prot: struct proto associated with this new sock instance
1732 * @kern: is this to be a kernel socket?
1733 */
1734 struct sock *sk_alloc(struct net *net, int family, gfp_t priority,
1735 struct proto *prot, int kern)
1736 {
1737 struct sock *sk;
1738
1739 sk = sk_prot_alloc(prot, priority | __GFP_ZERO, family);
1740 if (sk) {
1741 sk->sk_family = family;
1742 /*
1743 * See comment in struct sock definition to understand
1744 * why we need sk_prot_creator -acme
1745 */
1746 sk->sk_prot = sk->sk_prot_creator = prot;
1747 sk->sk_kern_sock = kern;
1748 sock_lock_init(sk);
1749 sk->sk_net_refcnt = kern ? 0 : 1;
1750 if (likely(sk->sk_net_refcnt)) {
1751 get_net(net);
1752 sock_inuse_add(net, 1);
1753 }
1754
1755 sock_net_set(sk, net);
1756 refcount_set(&sk->sk_wmem_alloc, 1);
1757
1758 mem_cgroup_sk_alloc(sk);
1759 cgroup_sk_alloc(&sk->sk_cgrp_data);
1760 sock_update_classid(&sk->sk_cgrp_data);
1761 sock_update_netprioidx(&sk->sk_cgrp_data);
1762 sk_tx_queue_clear(sk);
1763 }
1764
1765 return sk;
1766 }
1767 EXPORT_SYMBOL(sk_alloc);
1768
1769 /* Sockets having SOCK_RCU_FREE will call this function after one RCU
1770 * grace period. This is the case for UDP sockets and TCP listeners.
1771 */
1772 static void __sk_destruct(struct rcu_head *head)
1773 {
1774 struct sock *sk = container_of(head, struct sock, sk_rcu);
1775 struct sk_filter *filter;
1776
1777 if (sk->sk_destruct)
1778 sk->sk_destruct(sk);
1779
1780 filter = rcu_dereference_check(sk->sk_filter,
1781 refcount_read(&sk->sk_wmem_alloc) == 0);
1782 if (filter) {
1783 sk_filter_uncharge(sk, filter);
1784 RCU_INIT_POINTER(sk->sk_filter, NULL);
1785 }
1786
1787 sock_disable_timestamp(sk, SK_FLAGS_TIMESTAMP);
1788
1789 #ifdef CONFIG_BPF_SYSCALL
1790 bpf_sk_storage_free(sk);
1791 #endif
1792
1793 if (atomic_read(&sk->sk_omem_alloc))
1794 pr_debug("%s: optmem leakage (%d bytes) detected\n",
1795 __func__, atomic_read(&sk->sk_omem_alloc));
1796
1797 if (sk->sk_frag.page) {
1798 put_page(sk->sk_frag.page);
1799 sk->sk_frag.page = NULL;
1800 }
1801
1802 if (sk->sk_peer_cred)
1803 put_cred(sk->sk_peer_cred);
1804 put_pid(sk->sk_peer_pid);
1805 if (likely(sk->sk_net_refcnt))
1806 put_net(sock_net(sk));
1807 sk_prot_free(sk->sk_prot_creator, sk);
1808 }
1809
1810 void sk_destruct(struct sock *sk)
1811 {
1812 bool use_call_rcu = sock_flag(sk, SOCK_RCU_FREE);
1813
1814 if (rcu_access_pointer(sk->sk_reuseport_cb)) {
1815 reuseport_detach_sock(sk);
1816 use_call_rcu = true;
1817 }
1818
1819 if (use_call_rcu)
1820 call_rcu(&sk->sk_rcu, __sk_destruct);
1821 else
1822 __sk_destruct(&sk->sk_rcu);
1823 }
1824
1825 static void __sk_free(struct sock *sk)
1826 {
1827 if (likely(sk->sk_net_refcnt))
1828 sock_inuse_add(sock_net(sk), -1);
1829
1830 if (unlikely(sk->sk_net_refcnt && sock_diag_has_destroy_listeners(sk)))
1831 sock_diag_broadcast_destroy(sk);
1832 else
1833 sk_destruct(sk);
1834 }
1835
1836 void sk_free(struct sock *sk)
1837 {
1838 /*
1839 * We subtract one from sk_wmem_alloc and can know if
1840 * some packets are still in some tx queue.
1841 * If not null, sock_wfree() will call __sk_free(sk) later
1842 */
1843 if (refcount_dec_and_test(&sk->sk_wmem_alloc))
1844 __sk_free(sk);
1845 }
1846 EXPORT_SYMBOL(sk_free);
1847
1848 static void sk_init_common(struct sock *sk)
1849 {
1850 skb_queue_head_init(&sk->sk_receive_queue);
1851 skb_queue_head_init(&sk->sk_write_queue);
1852 skb_queue_head_init(&sk->sk_error_queue);
1853
1854 rwlock_init(&sk->sk_callback_lock);
1855 lockdep_set_class_and_name(&sk->sk_receive_queue.lock,
1856 af_rlock_keys + sk->sk_family,
1857 af_family_rlock_key_strings[sk->sk_family]);
1858 lockdep_set_class_and_name(&sk->sk_write_queue.lock,
1859 af_wlock_keys + sk->sk_family,
1860 af_family_wlock_key_strings[sk->sk_family]);
1861 lockdep_set_class_and_name(&sk->sk_error_queue.lock,
1862 af_elock_keys + sk->sk_family,
1863 af_family_elock_key_strings[sk->sk_family]);
1864 lockdep_set_class_and_name(&sk->sk_callback_lock,
1865 af_callback_keys + sk->sk_family,
1866 af_family_clock_key_strings[sk->sk_family]);
1867 }
1868
1869 /**
1870 * sk_clone_lock - clone a socket, and lock its clone
1871 * @sk: the socket to clone
1872 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
1873 *
1874 * Caller must unlock socket even in error path (bh_unlock_sock(newsk))
1875 */
1876 struct sock *sk_clone_lock(const struct sock *sk, const gfp_t priority)
1877 {
1878 struct proto *prot = READ_ONCE(sk->sk_prot);
1879 struct sock *newsk;
1880 bool is_charged = true;
1881
1882 newsk = sk_prot_alloc(prot, priority, sk->sk_family);
1883 if (newsk != NULL) {
1884 struct sk_filter *filter;
1885
1886 sock_copy(newsk, sk);
1887
1888 newsk->sk_prot_creator = prot;
1889
1890 /* SANITY */
1891 if (likely(newsk->sk_net_refcnt))
1892 get_net(sock_net(newsk));
1893 sk_node_init(&newsk->sk_node);
1894 sock_lock_init(newsk);
1895 bh_lock_sock(newsk);
1896 newsk->sk_backlog.head = newsk->sk_backlog.tail = NULL;
1897 newsk->sk_backlog.len = 0;
1898
1899 atomic_set(&newsk->sk_rmem_alloc, 0);
1900 /*
1901 * sk_wmem_alloc set to one (see sk_free() and sock_wfree())
1902 */
1903 refcount_set(&newsk->sk_wmem_alloc, 1);
1904 atomic_set(&newsk->sk_omem_alloc, 0);
1905 sk_init_common(newsk);
1906
1907 newsk->sk_dst_cache = NULL;
1908 newsk->sk_dst_pending_confirm = 0;
1909 newsk->sk_wmem_queued = 0;
1910 newsk->sk_forward_alloc = 0;
1911 atomic_set(&newsk->sk_drops, 0);
1912 newsk->sk_send_head = NULL;
1913 newsk->sk_userlocks = sk->sk_userlocks & ~SOCK_BINDPORT_LOCK;
1914 atomic_set(&newsk->sk_zckey, 0);
1915
1916 sock_reset_flag(newsk, SOCK_DONE);
1917
1918 /* sk->sk_memcg will be populated at accept() time */
1919 newsk->sk_memcg = NULL;
1920
1921 cgroup_sk_clone(&newsk->sk_cgrp_data);
1922
1923 rcu_read_lock();
1924 filter = rcu_dereference(sk->sk_filter);
1925 if (filter != NULL)
1926 /* though it's an empty new sock, the charging may fail
1927 * if sysctl_optmem_max was changed between creation of
1928 * original socket and cloning
1929 */
1930 is_charged = sk_filter_charge(newsk, filter);
1931 RCU_INIT_POINTER(newsk->sk_filter, filter);
1932 rcu_read_unlock();
1933
1934 if (unlikely(!is_charged || xfrm_sk_clone_policy(newsk, sk))) {
1935 /* We need to make sure that we don't uncharge the new
1936 * socket if we couldn't charge it in the first place
1937 * as otherwise we uncharge the parent's filter.
1938 */
1939 if (!is_charged)
1940 RCU_INIT_POINTER(newsk->sk_filter, NULL);
1941 sk_free_unlock_clone(newsk);
1942 newsk = NULL;
1943 goto out;
1944 }
1945 RCU_INIT_POINTER(newsk->sk_reuseport_cb, NULL);
1946
1947 if (bpf_sk_storage_clone(sk, newsk)) {
1948 sk_free_unlock_clone(newsk);
1949 newsk = NULL;
1950 goto out;
1951 }
1952
1953 /* Clear sk_user_data if parent had the pointer tagged
1954 * as not suitable for copying when cloning.
1955 */
1956 if (sk_user_data_is_nocopy(newsk))
1957 newsk->sk_user_data = NULL;
1958
1959 newsk->sk_err = 0;
1960 newsk->sk_err_soft = 0;
1961 newsk->sk_priority = 0;
1962 newsk->sk_incoming_cpu = raw_smp_processor_id();
1963 if (likely(newsk->sk_net_refcnt))
1964 sock_inuse_add(sock_net(newsk), 1);
1965
1966 /*
1967 * Before updating sk_refcnt, we must commit prior changes to memory
1968 * (Documentation/RCU/rculist_nulls.rst for details)
1969 */
1970 smp_wmb();
1971 refcount_set(&newsk->sk_refcnt, 2);
1972
1973 /*
1974 * Increment the counter in the same struct proto as the master
1975 * sock (sk_refcnt_debug_inc uses newsk->sk_prot->socks, that
1976 * is the same as sk->sk_prot->socks, as this field was copied
1977 * with memcpy).
1978 *
1979 * This _changes_ the previous behaviour, where
1980 * tcp_create_openreq_child always was incrementing the
1981 * equivalent to tcp_prot->socks (inet_sock_nr), so this have
1982 * to be taken into account in all callers. -acme
1983 */
1984 sk_refcnt_debug_inc(newsk);
1985 sk_set_socket(newsk, NULL);
1986 sk_tx_queue_clear(newsk);
1987 RCU_INIT_POINTER(newsk->sk_wq, NULL);
1988
1989 if (newsk->sk_prot->sockets_allocated)
1990 sk_sockets_allocated_inc(newsk);
1991
1992 if (sock_needs_netstamp(sk) &&
1993 newsk->sk_flags & SK_FLAGS_TIMESTAMP)
1994 net_enable_timestamp();
1995 }
1996 out:
1997 return newsk;
1998 }
1999 EXPORT_SYMBOL_GPL(sk_clone_lock);
2000
2001 void sk_free_unlock_clone(struct sock *sk)
2002 {
2003 /* It is still raw copy of parent, so invalidate
2004 * destructor and make plain sk_free() */
2005 sk->sk_destruct = NULL;
2006 bh_unlock_sock(sk);
2007 sk_free(sk);
2008 }
2009 EXPORT_SYMBOL_GPL(sk_free_unlock_clone);
2010
2011 void sk_setup_caps(struct sock *sk, struct dst_entry *dst)
2012 {
2013 u32 max_segs = 1;
2014
2015 sk_dst_set(sk, dst);
2016 sk->sk_route_caps = dst->dev->features | sk->sk_route_forced_caps;
2017 if (sk->sk_route_caps & NETIF_F_GSO)
2018 sk->sk_route_caps |= NETIF_F_GSO_SOFTWARE;
2019 sk->sk_route_caps &= ~sk->sk_route_nocaps;
2020 if (sk_can_gso(sk)) {
2021 if (dst->header_len && !xfrm_dst_offload_ok(dst)) {
2022 sk->sk_route_caps &= ~NETIF_F_GSO_MASK;
2023 } else {
2024 sk->sk_route_caps |= NETIF_F_SG | NETIF_F_HW_CSUM;
2025 sk->sk_gso_max_size = dst->dev->gso_max_size;
2026 max_segs = max_t(u32, dst->dev->gso_max_segs, 1);
2027 }
2028 }
2029 sk->sk_gso_max_segs = max_segs;
2030 }
2031 EXPORT_SYMBOL_GPL(sk_setup_caps);
2032
2033 /*
2034 * Simple resource managers for sockets.
2035 */
2036
2037
2038 /*
2039 * Write buffer destructor automatically called from kfree_skb.
2040 */
2041 void sock_wfree(struct sk_buff *skb)
2042 {
2043 struct sock *sk = skb->sk;
2044 unsigned int len = skb->truesize;
2045
2046 if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE)) {
2047 /*
2048 * Keep a reference on sk_wmem_alloc, this will be released
2049 * after sk_write_space() call
2050 */
2051 WARN_ON(refcount_sub_and_test(len - 1, &sk->sk_wmem_alloc));
2052 sk->sk_write_space(sk);
2053 len = 1;
2054 }
2055 /*
2056 * if sk_wmem_alloc reaches 0, we must finish what sk_free()
2057 * could not do because of in-flight packets
2058 */
2059 if (refcount_sub_and_test(len, &sk->sk_wmem_alloc))
2060 __sk_free(sk);
2061 }
2062 EXPORT_SYMBOL(sock_wfree);
2063
2064 /* This variant of sock_wfree() is used by TCP,
2065 * since it sets SOCK_USE_WRITE_QUEUE.
2066 */
2067 void __sock_wfree(struct sk_buff *skb)
2068 {
2069 struct sock *sk = skb->sk;
2070
2071 if (refcount_sub_and_test(skb->truesize, &sk->sk_wmem_alloc))
2072 __sk_free(sk);
2073 }
2074
2075 void skb_set_owner_w(struct sk_buff *skb, struct sock *sk)
2076 {
2077 skb_orphan(skb);
2078 skb->sk = sk;
2079 #ifdef CONFIG_INET
2080 if (unlikely(!sk_fullsock(sk))) {
2081 skb->destructor = sock_edemux;
2082 sock_hold(sk);
2083 return;
2084 }
2085 #endif
2086 skb->destructor = sock_wfree;
2087 skb_set_hash_from_sk(skb, sk);
2088 /*
2089 * We used to take a refcount on sk, but following operation
2090 * is enough to guarantee sk_free() wont free this sock until
2091 * all in-flight packets are completed
2092 */
2093 refcount_add(skb->truesize, &sk->sk_wmem_alloc);
2094 }
2095 EXPORT_SYMBOL(skb_set_owner_w);
2096
2097 static bool can_skb_orphan_partial(const struct sk_buff *skb)
2098 {
2099 #ifdef CONFIG_TLS_DEVICE
2100 /* Drivers depend on in-order delivery for crypto offload,
2101 * partial orphan breaks out-of-order-OK logic.
2102 */
2103 if (skb->decrypted)
2104 return false;
2105 #endif
2106 return (skb->destructor == sock_wfree ||
2107 (IS_ENABLED(CONFIG_INET) && skb->destructor == tcp_wfree));
2108 }
2109
2110 /* This helper is used by netem, as it can hold packets in its
2111 * delay queue. We want to allow the owner socket to send more
2112 * packets, as if they were already TX completed by a typical driver.
2113 * But we also want to keep skb->sk set because some packet schedulers
2114 * rely on it (sch_fq for example).
2115 */
2116 void skb_orphan_partial(struct sk_buff *skb)
2117 {
2118 if (skb_is_tcp_pure_ack(skb))
2119 return;
2120
2121 if (can_skb_orphan_partial(skb)) {
2122 struct sock *sk = skb->sk;
2123
2124 if (refcount_inc_not_zero(&sk->sk_refcnt)) {
2125 WARN_ON(refcount_sub_and_test(skb->truesize, &sk->sk_wmem_alloc));
2126 skb->destructor = sock_efree;
2127 }
2128 } else {
2129 skb_orphan(skb);
2130 }
2131 }
2132 EXPORT_SYMBOL(skb_orphan_partial);
2133
2134 /*
2135 * Read buffer destructor automatically called from kfree_skb.
2136 */
2137 void sock_rfree(struct sk_buff *skb)
2138 {
2139 struct sock *sk = skb->sk;
2140 unsigned int len = skb->truesize;
2141
2142 atomic_sub(len, &sk->sk_rmem_alloc);
2143 sk_mem_uncharge(sk, len);
2144 }
2145 EXPORT_SYMBOL(sock_rfree);
2146
2147 /*
2148 * Buffer destructor for skbs that are not used directly in read or write
2149 * path, e.g. for error handler skbs. Automatically called from kfree_skb.
2150 */
2151 void sock_efree(struct sk_buff *skb)
2152 {
2153 sock_put(skb->sk);
2154 }
2155 EXPORT_SYMBOL(sock_efree);
2156
2157 /* Buffer destructor for prefetch/receive path where reference count may
2158 * not be held, e.g. for listen sockets.
2159 */
2160 #ifdef CONFIG_INET
2161 void sock_pfree(struct sk_buff *skb)
2162 {
2163 if (sk_is_refcounted(skb->sk))
2164 sock_gen_put(skb->sk);
2165 }
2166 EXPORT_SYMBOL(sock_pfree);
2167 #endif /* CONFIG_INET */
2168
2169 kuid_t sock_i_uid(struct sock *sk)
2170 {
2171 kuid_t uid;
2172
2173 read_lock_bh(&sk->sk_callback_lock);
2174 uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : GLOBAL_ROOT_UID;
2175 read_unlock_bh(&sk->sk_callback_lock);
2176 return uid;
2177 }
2178 EXPORT_SYMBOL(sock_i_uid);
2179
2180 unsigned long sock_i_ino(struct sock *sk)
2181 {
2182 unsigned long ino;
2183
2184 read_lock_bh(&sk->sk_callback_lock);
2185 ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0;
2186 read_unlock_bh(&sk->sk_callback_lock);
2187 return ino;
2188 }
2189 EXPORT_SYMBOL(sock_i_ino);
2190
2191 /*
2192 * Allocate a skb from the socket's send buffer.
2193 */
2194 struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force,
2195 gfp_t priority)
2196 {
2197 if (force ||
2198 refcount_read(&sk->sk_wmem_alloc) < READ_ONCE(sk->sk_sndbuf)) {
2199 struct sk_buff *skb = alloc_skb(size, priority);
2200
2201 if (skb) {
2202 skb_set_owner_w(skb, sk);
2203 return skb;
2204 }
2205 }
2206 return NULL;
2207 }
2208 EXPORT_SYMBOL(sock_wmalloc);
2209
2210 static void sock_ofree(struct sk_buff *skb)
2211 {
2212 struct sock *sk = skb->sk;
2213
2214 atomic_sub(skb->truesize, &sk->sk_omem_alloc);
2215 }
2216
2217 struct sk_buff *sock_omalloc(struct sock *sk, unsigned long size,
2218 gfp_t priority)
2219 {
2220 struct sk_buff *skb;
2221
2222 /* small safe race: SKB_TRUESIZE may differ from final skb->truesize */
2223 if (atomic_read(&sk->sk_omem_alloc) + SKB_TRUESIZE(size) >
2224 sysctl_optmem_max)
2225 return NULL;
2226
2227 skb = alloc_skb(size, priority);
2228 if (!skb)
2229 return NULL;
2230
2231 atomic_add(skb->truesize, &sk->sk_omem_alloc);
2232 skb->sk = sk;
2233 skb->destructor = sock_ofree;
2234 return skb;
2235 }
2236
2237 /*
2238 * Allocate a memory block from the socket's option memory buffer.
2239 */
2240 void *sock_kmalloc(struct sock *sk, int size, gfp_t priority)
2241 {
2242 if ((unsigned int)size <= sysctl_optmem_max &&
2243 atomic_read(&sk->sk_omem_alloc) + size < sysctl_optmem_max) {
2244 void *mem;
2245 /* First do the add, to avoid the race if kmalloc
2246 * might sleep.
2247 */
2248 atomic_add(size, &sk->sk_omem_alloc);
2249 mem = kmalloc(size, priority);
2250 if (mem)
2251 return mem;
2252 atomic_sub(size, &sk->sk_omem_alloc);
2253 }
2254 return NULL;
2255 }
2256 EXPORT_SYMBOL(sock_kmalloc);
2257
2258 /* Free an option memory block. Note, we actually want the inline
2259 * here as this allows gcc to detect the nullify and fold away the
2260 * condition entirely.
2261 */
2262 static inline void __sock_kfree_s(struct sock *sk, void *mem, int size,
2263 const bool nullify)
2264 {
2265 if (WARN_ON_ONCE(!mem))
2266 return;
2267 if (nullify)
2268 kfree_sensitive(mem);
2269 else
2270 kfree(mem);
2271 atomic_sub(size, &sk->sk_omem_alloc);
2272 }
2273
2274 void sock_kfree_s(struct sock *sk, void *mem, int size)
2275 {
2276 __sock_kfree_s(sk, mem, size, false);
2277 }
2278 EXPORT_SYMBOL(sock_kfree_s);
2279
2280 void sock_kzfree_s(struct sock *sk, void *mem, int size)
2281 {
2282 __sock_kfree_s(sk, mem, size, true);
2283 }
2284 EXPORT_SYMBOL(sock_kzfree_s);
2285
2286 /* It is almost wait_for_tcp_memory minus release_sock/lock_sock.
2287 I think, these locks should be removed for datagram sockets.
2288 */
2289 static long sock_wait_for_wmem(struct sock *sk, long timeo)
2290 {
2291 DEFINE_WAIT(wait);
2292
2293 sk_clear_bit(SOCKWQ_ASYNC_NOSPACE, sk);
2294 for (;;) {
2295 if (!timeo)
2296 break;
2297 if (signal_pending(current))
2298 break;
2299 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
2300 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
2301 if (refcount_read(&sk->sk_wmem_alloc) < READ_ONCE(sk->sk_sndbuf))
2302 break;
2303 if (sk->sk_shutdown & SEND_SHUTDOWN)
2304 break;
2305 if (sk->sk_err)
2306 break;
2307 timeo = schedule_timeout(timeo);
2308 }
2309 finish_wait(sk_sleep(sk), &wait);
2310 return timeo;
2311 }
2312
2313
2314 /*
2315 * Generic send/receive buffer handlers
2316 */
2317
2318 struct sk_buff *sock_alloc_send_pskb(struct sock *sk, unsigned long header_len,
2319 unsigned long data_len, int noblock,
2320 int *errcode, int max_page_order)
2321 {
2322 struct sk_buff *skb;
2323 long timeo;
2324 int err;
2325
2326 timeo = sock_sndtimeo(sk, noblock);
2327 for (;;) {
2328 err = sock_error(sk);
2329 if (err != 0)
2330 goto failure;
2331
2332 err = -EPIPE;
2333 if (sk->sk_shutdown & SEND_SHUTDOWN)
2334 goto failure;
2335
2336 if (sk_wmem_alloc_get(sk) < READ_ONCE(sk->sk_sndbuf))
2337 break;
2338
2339 sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk);
2340 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
2341 err = -EAGAIN;
2342 if (!timeo)
2343 goto failure;
2344 if (signal_pending(current))
2345 goto interrupted;
2346 timeo = sock_wait_for_wmem(sk, timeo);
2347 }
2348 skb = alloc_skb_with_frags(header_len, data_len, max_page_order,
2349 errcode, sk->sk_allocation);
2350 if (skb)
2351 skb_set_owner_w(skb, sk);
2352 return skb;
2353
2354 interrupted:
2355 err = sock_intr_errno(timeo);
2356 failure:
2357 *errcode = err;
2358 return NULL;
2359 }
2360 EXPORT_SYMBOL(sock_alloc_send_pskb);
2361
2362 struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size,
2363 int noblock, int *errcode)
2364 {
2365 return sock_alloc_send_pskb(sk, size, 0, noblock, errcode, 0);
2366 }
2367 EXPORT_SYMBOL(sock_alloc_send_skb);
2368
2369 int __sock_cmsg_send(struct sock *sk, struct msghdr *msg, struct cmsghdr *cmsg,
2370 struct sockcm_cookie *sockc)
2371 {
2372 u32 tsflags;
2373
2374 switch (cmsg->cmsg_type) {
2375 case SO_MARK:
2376 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
2377 return -EPERM;
2378 if (cmsg->cmsg_len != CMSG_LEN(sizeof(u32)))
2379 return -EINVAL;
2380 sockc->mark = *(u32 *)CMSG_DATA(cmsg);
2381 break;
2382 case SO_TIMESTAMPING_OLD:
2383 if (cmsg->cmsg_len != CMSG_LEN(sizeof(u32)))
2384 return -EINVAL;
2385
2386 tsflags = *(u32 *)CMSG_DATA(cmsg);
2387 if (tsflags & ~SOF_TIMESTAMPING_TX_RECORD_MASK)
2388 return -EINVAL;
2389
2390 sockc->tsflags &= ~SOF_TIMESTAMPING_TX_RECORD_MASK;
2391 sockc->tsflags |= tsflags;
2392 break;
2393 case SCM_TXTIME:
2394 if (!sock_flag(sk, SOCK_TXTIME))
2395 return -EINVAL;
2396 if (cmsg->cmsg_len != CMSG_LEN(sizeof(u64)))
2397 return -EINVAL;
2398 sockc->transmit_time = get_unaligned((u64 *)CMSG_DATA(cmsg));
2399 break;
2400 /* SCM_RIGHTS and SCM_CREDENTIALS are semantically in SOL_UNIX. */
2401 case SCM_RIGHTS:
2402 case SCM_CREDENTIALS:
2403 break;
2404 default:
2405 return -EINVAL;
2406 }
2407 return 0;
2408 }
2409 EXPORT_SYMBOL(__sock_cmsg_send);
2410
2411 int sock_cmsg_send(struct sock *sk, struct msghdr *msg,
2412 struct sockcm_cookie *sockc)
2413 {
2414 struct cmsghdr *cmsg;
2415 int ret;
2416
2417 for_each_cmsghdr(cmsg, msg) {
2418 if (!CMSG_OK(msg, cmsg))
2419 return -EINVAL;
2420 if (cmsg->cmsg_level != SOL_SOCKET)
2421 continue;
2422 ret = __sock_cmsg_send(sk, msg, cmsg, sockc);
2423 if (ret)
2424 return ret;
2425 }
2426 return 0;
2427 }
2428 EXPORT_SYMBOL(sock_cmsg_send);
2429
2430 static void sk_enter_memory_pressure(struct sock *sk)
2431 {
2432 if (!sk->sk_prot->enter_memory_pressure)
2433 return;
2434
2435 sk->sk_prot->enter_memory_pressure(sk);
2436 }
2437
2438 static void sk_leave_memory_pressure(struct sock *sk)
2439 {
2440 if (sk->sk_prot->leave_memory_pressure) {
2441 sk->sk_prot->leave_memory_pressure(sk);
2442 } else {
2443 unsigned long *memory_pressure = sk->sk_prot->memory_pressure;
2444
2445 if (memory_pressure && READ_ONCE(*memory_pressure))
2446 WRITE_ONCE(*memory_pressure, 0);
2447 }
2448 }
2449
2450 #define SKB_FRAG_PAGE_ORDER get_order(32768)
2451 DEFINE_STATIC_KEY_FALSE(net_high_order_alloc_disable_key);
2452
2453 /**
2454 * skb_page_frag_refill - check that a page_frag contains enough room
2455 * @sz: minimum size of the fragment we want to get
2456 * @pfrag: pointer to page_frag
2457 * @gfp: priority for memory allocation
2458 *
2459 * Note: While this allocator tries to use high order pages, there is
2460 * no guarantee that allocations succeed. Therefore, @sz MUST be
2461 * less or equal than PAGE_SIZE.
2462 */
2463 bool skb_page_frag_refill(unsigned int sz, struct page_frag *pfrag, gfp_t gfp)
2464 {
2465 if (pfrag->page) {
2466 if (page_ref_count(pfrag->page) == 1) {
2467 pfrag->offset = 0;
2468 return true;
2469 }
2470 if (pfrag->offset + sz <= pfrag->size)
2471 return true;
2472 put_page(pfrag->page);
2473 }
2474
2475 pfrag->offset = 0;
2476 if (SKB_FRAG_PAGE_ORDER &&
2477 !static_branch_unlikely(&net_high_order_alloc_disable_key)) {
2478 /* Avoid direct reclaim but allow kswapd to wake */
2479 pfrag->page = alloc_pages((gfp & ~__GFP_DIRECT_RECLAIM) |
2480 __GFP_COMP | __GFP_NOWARN |
2481 __GFP_NORETRY,
2482 SKB_FRAG_PAGE_ORDER);
2483 if (likely(pfrag->page)) {
2484 pfrag->size = PAGE_SIZE << SKB_FRAG_PAGE_ORDER;
2485 return true;
2486 }
2487 }
2488 pfrag->page = alloc_page(gfp);
2489 if (likely(pfrag->page)) {
2490 pfrag->size = PAGE_SIZE;
2491 return true;
2492 }
2493 return false;
2494 }
2495 EXPORT_SYMBOL(skb_page_frag_refill);
2496
2497 bool sk_page_frag_refill(struct sock *sk, struct page_frag *pfrag)
2498 {
2499 if (likely(skb_page_frag_refill(32U, pfrag, sk->sk_allocation)))
2500 return true;
2501
2502 sk_enter_memory_pressure(sk);
2503 sk_stream_moderate_sndbuf(sk);
2504 return false;
2505 }
2506 EXPORT_SYMBOL(sk_page_frag_refill);
2507
2508 void __lock_sock(struct sock *sk)
2509 __releases(&sk->sk_lock.slock)
2510 __acquires(&sk->sk_lock.slock)
2511 {
2512 DEFINE_WAIT(wait);
2513
2514 for (;;) {
2515 prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait,
2516 TASK_UNINTERRUPTIBLE);
2517 spin_unlock_bh(&sk->sk_lock.slock);
2518 schedule();
2519 spin_lock_bh(&sk->sk_lock.slock);
2520 if (!sock_owned_by_user(sk))
2521 break;
2522 }
2523 finish_wait(&sk->sk_lock.wq, &wait);
2524 }
2525
2526 void __release_sock(struct sock *sk)
2527 __releases(&sk->sk_lock.slock)
2528 __acquires(&sk->sk_lock.slock)
2529 {
2530 struct sk_buff *skb, *next;
2531
2532 while ((skb = sk->sk_backlog.head) != NULL) {
2533 sk->sk_backlog.head = sk->sk_backlog.tail = NULL;
2534
2535 spin_unlock_bh(&sk->sk_lock.slock);
2536
2537 do {
2538 next = skb->next;
2539 prefetch(next);
2540 WARN_ON_ONCE(skb_dst_is_noref(skb));
2541 skb_mark_not_on_list(skb);
2542 sk_backlog_rcv(sk, skb);
2543
2544 cond_resched();
2545
2546 skb = next;
2547 } while (skb != NULL);
2548
2549 spin_lock_bh(&sk->sk_lock.slock);
2550 }
2551
2552 /*
2553 * Doing the zeroing here guarantee we can not loop forever
2554 * while a wild producer attempts to flood us.
2555 */
2556 sk->sk_backlog.len = 0;
2557 }
2558
2559 void __sk_flush_backlog(struct sock *sk)
2560 {
2561 spin_lock_bh(&sk->sk_lock.slock);
2562 __release_sock(sk);
2563 spin_unlock_bh(&sk->sk_lock.slock);
2564 }
2565
2566 /**
2567 * sk_wait_data - wait for data to arrive at sk_receive_queue
2568 * @sk: sock to wait on
2569 * @timeo: for how long
2570 * @skb: last skb seen on sk_receive_queue
2571 *
2572 * Now socket state including sk->sk_err is changed only under lock,
2573 * hence we may omit checks after joining wait queue.
2574 * We check receive queue before schedule() only as optimization;
2575 * it is very likely that release_sock() added new data.
2576 */
2577 int sk_wait_data(struct sock *sk, long *timeo, const struct sk_buff *skb)
2578 {
2579 DEFINE_WAIT_FUNC(wait, woken_wake_function);
2580 int rc;
2581
2582 add_wait_queue(sk_sleep(sk), &wait);
2583 sk_set_bit(SOCKWQ_ASYNC_WAITDATA, sk);
2584 rc = sk_wait_event(sk, timeo, skb_peek_tail(&sk->sk_receive_queue) != skb, &wait);
2585 sk_clear_bit(SOCKWQ_ASYNC_WAITDATA, sk);
2586 remove_wait_queue(sk_sleep(sk), &wait);
2587 return rc;
2588 }
2589 EXPORT_SYMBOL(sk_wait_data);
2590
2591 /**
2592 * __sk_mem_raise_allocated - increase memory_allocated
2593 * @sk: socket
2594 * @size: memory size to allocate
2595 * @amt: pages to allocate
2596 * @kind: allocation type
2597 *
2598 * Similar to __sk_mem_schedule(), but does not update sk_forward_alloc
2599 */
2600 int __sk_mem_raise_allocated(struct sock *sk, int size, int amt, int kind)
2601 {
2602 struct proto *prot = sk->sk_prot;
2603 long allocated = sk_memory_allocated_add(sk, amt);
2604 bool charged = true;
2605
2606 if (mem_cgroup_sockets_enabled && sk->sk_memcg &&
2607 !(charged = mem_cgroup_charge_skmem(sk->sk_memcg, amt)))
2608 goto suppress_allocation;
2609
2610 /* Under limit. */
2611 if (allocated <= sk_prot_mem_limits(sk, 0)) {
2612 sk_leave_memory_pressure(sk);
2613 return 1;
2614 }
2615
2616 /* Under pressure. */
2617 if (allocated > sk_prot_mem_limits(sk, 1))
2618 sk_enter_memory_pressure(sk);
2619
2620 /* Over hard limit. */
2621 if (allocated > sk_prot_mem_limits(sk, 2))
2622 goto suppress_allocation;
2623
2624 /* guarantee minimum buffer size under pressure */
2625 if (kind == SK_MEM_RECV) {
2626 if (atomic_read(&sk->sk_rmem_alloc) < sk_get_rmem0(sk, prot))
2627 return 1;
2628
2629 } else { /* SK_MEM_SEND */
2630 int wmem0 = sk_get_wmem0(sk, prot);
2631
2632 if (sk->sk_type == SOCK_STREAM) {
2633 if (sk->sk_wmem_queued < wmem0)
2634 return 1;
2635 } else if (refcount_read(&sk->sk_wmem_alloc) < wmem0) {
2636 return 1;
2637 }
2638 }
2639
2640 if (sk_has_memory_pressure(sk)) {
2641 u64 alloc;
2642
2643 if (!sk_under_memory_pressure(sk))
2644 return 1;
2645 alloc = sk_sockets_allocated_read_positive(sk);
2646 if (sk_prot_mem_limits(sk, 2) > alloc *
2647 sk_mem_pages(sk->sk_wmem_queued +
2648 atomic_read(&sk->sk_rmem_alloc) +
2649 sk->sk_forward_alloc))
2650 return 1;
2651 }
2652
2653 suppress_allocation:
2654
2655 if (kind == SK_MEM_SEND && sk->sk_type == SOCK_STREAM) {
2656 sk_stream_moderate_sndbuf(sk);
2657
2658 /* Fail only if socket is _under_ its sndbuf.
2659 * In this case we cannot block, so that we have to fail.
2660 */
2661 if (sk->sk_wmem_queued + size >= sk->sk_sndbuf)
2662 return 1;
2663 }
2664
2665 if (kind == SK_MEM_SEND || (kind == SK_MEM_RECV && charged))
2666 trace_sock_exceed_buf_limit(sk, prot, allocated, kind);
2667
2668 sk_memory_allocated_sub(sk, amt);
2669
2670 if (mem_cgroup_sockets_enabled && sk->sk_memcg)
2671 mem_cgroup_uncharge_skmem(sk->sk_memcg, amt);
2672
2673 return 0;
2674 }
2675 EXPORT_SYMBOL(__sk_mem_raise_allocated);
2676
2677 /**
2678 * __sk_mem_schedule - increase sk_forward_alloc and memory_allocated
2679 * @sk: socket
2680 * @size: memory size to allocate
2681 * @kind: allocation type
2682 *
2683 * If kind is SK_MEM_SEND, it means wmem allocation. Otherwise it means
2684 * rmem allocation. This function assumes that protocols which have
2685 * memory_pressure use sk_wmem_queued as write buffer accounting.
2686 */
2687 int __sk_mem_schedule(struct sock *sk, int size, int kind)
2688 {
2689 int ret, amt = sk_mem_pages(size);
2690
2691 sk->sk_forward_alloc += amt << SK_MEM_QUANTUM_SHIFT;
2692 ret = __sk_mem_raise_allocated(sk, size, amt, kind);
2693 if (!ret)
2694 sk->sk_forward_alloc -= amt << SK_MEM_QUANTUM_SHIFT;
2695 return ret;
2696 }
2697 EXPORT_SYMBOL(__sk_mem_schedule);
2698
2699 /**
2700 * __sk_mem_reduce_allocated - reclaim memory_allocated
2701 * @sk: socket
2702 * @amount: number of quanta
2703 *
2704 * Similar to __sk_mem_reclaim(), but does not update sk_forward_alloc
2705 */
2706 void __sk_mem_reduce_allocated(struct sock *sk, int amount)
2707 {
2708 sk_memory_allocated_sub(sk, amount);
2709
2710 if (mem_cgroup_sockets_enabled && sk->sk_memcg)
2711 mem_cgroup_uncharge_skmem(sk->sk_memcg, amount);
2712
2713 if (sk_under_memory_pressure(sk) &&
2714 (sk_memory_allocated(sk) < sk_prot_mem_limits(sk, 0)))
2715 sk_leave_memory_pressure(sk);
2716 }
2717 EXPORT_SYMBOL(__sk_mem_reduce_allocated);
2718
2719 /**
2720 * __sk_mem_reclaim - reclaim sk_forward_alloc and memory_allocated
2721 * @sk: socket
2722 * @amount: number of bytes (rounded down to a SK_MEM_QUANTUM multiple)
2723 */
2724 void __sk_mem_reclaim(struct sock *sk, int amount)
2725 {
2726 amount >>= SK_MEM_QUANTUM_SHIFT;
2727 sk->sk_forward_alloc -= amount << SK_MEM_QUANTUM_SHIFT;
2728 __sk_mem_reduce_allocated(sk, amount);
2729 }
2730 EXPORT_SYMBOL(__sk_mem_reclaim);
2731
2732 int sk_set_peek_off(struct sock *sk, int val)
2733 {
2734 sk->sk_peek_off = val;
2735 return 0;
2736 }
2737 EXPORT_SYMBOL_GPL(sk_set_peek_off);
2738
2739 /*
2740 * Set of default routines for initialising struct proto_ops when
2741 * the protocol does not support a particular function. In certain
2742 * cases where it makes no sense for a protocol to have a "do nothing"
2743 * function, some default processing is provided.
2744 */
2745
2746 int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len)
2747 {
2748 return -EOPNOTSUPP;
2749 }
2750 EXPORT_SYMBOL(sock_no_bind);
2751
2752 int sock_no_connect(struct socket *sock, struct sockaddr *saddr,
2753 int len, int flags)
2754 {
2755 return -EOPNOTSUPP;
2756 }
2757 EXPORT_SYMBOL(sock_no_connect);
2758
2759 int sock_no_socketpair(struct socket *sock1, struct socket *sock2)
2760 {
2761 return -EOPNOTSUPP;
2762 }
2763 EXPORT_SYMBOL(sock_no_socketpair);
2764
2765 int sock_no_accept(struct socket *sock, struct socket *newsock, int flags,
2766 bool kern)
2767 {
2768 return -EOPNOTSUPP;
2769 }
2770 EXPORT_SYMBOL(sock_no_accept);
2771
2772 int sock_no_getname(struct socket *sock, struct sockaddr *saddr,
2773 int peer)
2774 {
2775 return -EOPNOTSUPP;
2776 }
2777 EXPORT_SYMBOL(sock_no_getname);
2778
2779 int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
2780 {
2781 return -EOPNOTSUPP;
2782 }
2783 EXPORT_SYMBOL(sock_no_ioctl);
2784
2785 int sock_no_listen(struct socket *sock, int backlog)
2786 {
2787 return -EOPNOTSUPP;
2788 }
2789 EXPORT_SYMBOL(sock_no_listen);
2790
2791 int sock_no_shutdown(struct socket *sock, int how)
2792 {
2793 return -EOPNOTSUPP;
2794 }
2795 EXPORT_SYMBOL(sock_no_shutdown);
2796
2797 int sock_no_sendmsg(struct socket *sock, struct msghdr *m, size_t len)
2798 {
2799 return -EOPNOTSUPP;
2800 }
2801 EXPORT_SYMBOL(sock_no_sendmsg);
2802
2803 int sock_no_sendmsg_locked(struct sock *sk, struct msghdr *m, size_t len)
2804 {
2805 return -EOPNOTSUPP;
2806 }
2807 EXPORT_SYMBOL(sock_no_sendmsg_locked);
2808
2809 int sock_no_recvmsg(struct socket *sock, struct msghdr *m, size_t len,
2810 int flags)
2811 {
2812 return -EOPNOTSUPP;
2813 }
2814 EXPORT_SYMBOL(sock_no_recvmsg);
2815
2816 int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma)
2817 {
2818 /* Mirror missing mmap method error code */
2819 return -ENODEV;
2820 }
2821 EXPORT_SYMBOL(sock_no_mmap);
2822
2823 /*
2824 * When a file is received (via SCM_RIGHTS, etc), we must bump the
2825 * various sock-based usage counts.
2826 */
2827 void __receive_sock(struct file *file)
2828 {
2829 struct socket *sock;
2830
2831 sock = sock_from_file(file);
2832 if (sock) {
2833 sock_update_netprioidx(&sock->sk->sk_cgrp_data);
2834 sock_update_classid(&sock->sk->sk_cgrp_data);
2835 }
2836 }
2837
2838 ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags)
2839 {
2840 ssize_t res;
2841 struct msghdr msg = {.msg_flags = flags};
2842 struct kvec iov;
2843 char *kaddr = kmap(page);
2844 iov.iov_base = kaddr + offset;
2845 iov.iov_len = size;
2846 res = kernel_sendmsg(sock, &msg, &iov, 1, size);
2847 kunmap(page);
2848 return res;
2849 }
2850 EXPORT_SYMBOL(sock_no_sendpage);
2851
2852 ssize_t sock_no_sendpage_locked(struct sock *sk, struct page *page,
2853 int offset, size_t size, int flags)
2854 {
2855 ssize_t res;
2856 struct msghdr msg = {.msg_flags = flags};
2857 struct kvec iov;
2858 char *kaddr = kmap(page);
2859
2860 iov.iov_base = kaddr + offset;
2861 iov.iov_len = size;
2862 res = kernel_sendmsg_locked(sk, &msg, &iov, 1, size);
2863 kunmap(page);
2864 return res;
2865 }
2866 EXPORT_SYMBOL(sock_no_sendpage_locked);
2867
2868 /*
2869 * Default Socket Callbacks
2870 */
2871
2872 static void sock_def_wakeup(struct sock *sk)
2873 {
2874 struct socket_wq *wq;
2875
2876 rcu_read_lock();
2877 wq = rcu_dereference(sk->sk_wq);
2878 if (skwq_has_sleeper(wq))
2879 wake_up_interruptible_all(&wq->wait);
2880 rcu_read_unlock();
2881 }
2882
2883 static void sock_def_error_report(struct sock *sk)
2884 {
2885 struct socket_wq *wq;
2886
2887 rcu_read_lock();
2888 wq = rcu_dereference(sk->sk_wq);
2889 if (skwq_has_sleeper(wq))
2890 wake_up_interruptible_poll(&wq->wait, EPOLLERR);
2891 sk_wake_async(sk, SOCK_WAKE_IO, POLL_ERR);
2892 rcu_read_unlock();
2893 }
2894
2895 void sock_def_readable(struct sock *sk)
2896 {
2897 struct socket_wq *wq;
2898
2899 rcu_read_lock();
2900 wq = rcu_dereference(sk->sk_wq);
2901 if (skwq_has_sleeper(wq))
2902 wake_up_interruptible_sync_poll(&wq->wait, EPOLLIN | EPOLLPRI |
2903 EPOLLRDNORM | EPOLLRDBAND);
2904 sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN);
2905 rcu_read_unlock();
2906 }
2907
2908 static void sock_def_write_space(struct sock *sk)
2909 {
2910 struct socket_wq *wq;
2911
2912 rcu_read_lock();
2913
2914 /* Do not wake up a writer until he can make "significant"
2915 * progress. --DaveM
2916 */
2917 if ((refcount_read(&sk->sk_wmem_alloc) << 1) <= READ_ONCE(sk->sk_sndbuf)) {
2918 wq = rcu_dereference(sk->sk_wq);
2919 if (skwq_has_sleeper(wq))
2920 wake_up_interruptible_sync_poll(&wq->wait, EPOLLOUT |
2921 EPOLLWRNORM | EPOLLWRBAND);
2922
2923 /* Should agree with poll, otherwise some programs break */
2924 if (sock_writeable(sk))
2925 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
2926 }
2927
2928 rcu_read_unlock();
2929 }
2930
2931 static void sock_def_destruct(struct sock *sk)
2932 {
2933 }
2934
2935 void sk_send_sigurg(struct sock *sk)
2936 {
2937 if (sk->sk_socket && sk->sk_socket->file)
2938 if (send_sigurg(&sk->sk_socket->file->f_owner))
2939 sk_wake_async(sk, SOCK_WAKE_URG, POLL_PRI);
2940 }
2941 EXPORT_SYMBOL(sk_send_sigurg);
2942
2943 void sk_reset_timer(struct sock *sk, struct timer_list* timer,
2944 unsigned long expires)
2945 {
2946 if (!mod_timer(timer, expires))
2947 sock_hold(sk);
2948 }
2949 EXPORT_SYMBOL(sk_reset_timer);
2950
2951 void sk_stop_timer(struct sock *sk, struct timer_list* timer)
2952 {
2953 if (del_timer(timer))
2954 __sock_put(sk);
2955 }
2956 EXPORT_SYMBOL(sk_stop_timer);
2957
2958 void sk_stop_timer_sync(struct sock *sk, struct timer_list *timer)
2959 {
2960 if (del_timer_sync(timer))
2961 __sock_put(sk);
2962 }
2963 EXPORT_SYMBOL(sk_stop_timer_sync);
2964
2965 void sock_init_data(struct socket *sock, struct sock *sk)
2966 {
2967 sk_init_common(sk);
2968 sk->sk_send_head = NULL;
2969
2970 timer_setup(&sk->sk_timer, NULL, 0);
2971
2972 sk->sk_allocation = GFP_KERNEL;
2973 sk->sk_rcvbuf = sysctl_rmem_default;
2974 sk->sk_sndbuf = sysctl_wmem_default;
2975 sk->sk_state = TCP_CLOSE;
2976 sk_set_socket(sk, sock);
2977
2978 sock_set_flag(sk, SOCK_ZAPPED);
2979
2980 if (sock) {
2981 sk->sk_type = sock->type;
2982 RCU_INIT_POINTER(sk->sk_wq, &sock->wq);
2983 sock->sk = sk;
2984 sk->sk_uid = SOCK_INODE(sock)->i_uid;
2985 } else {
2986 RCU_INIT_POINTER(sk->sk_wq, NULL);
2987 sk->sk_uid = make_kuid(sock_net(sk)->user_ns, 0);
2988 }
2989
2990 rwlock_init(&sk->sk_callback_lock);
2991 if (sk->sk_kern_sock)
2992 lockdep_set_class_and_name(
2993 &sk->sk_callback_lock,
2994 af_kern_callback_keys + sk->sk_family,
2995 af_family_kern_clock_key_strings[sk->sk_family]);
2996 else
2997 lockdep_set_class_and_name(
2998 &sk->sk_callback_lock,
2999 af_callback_keys + sk->sk_family,
3000 af_family_clock_key_strings[sk->sk_family]);
3001
3002 sk->sk_state_change = sock_def_wakeup;
3003 sk->sk_data_ready = sock_def_readable;
3004 sk->sk_write_space = sock_def_write_space;
3005 sk->sk_error_report = sock_def_error_report;
3006 sk->sk_destruct = sock_def_destruct;
3007
3008 sk->sk_frag.page = NULL;
3009 sk->sk_frag.offset = 0;
3010 sk->sk_peek_off = -1;
3011
3012 sk->sk_peer_pid = NULL;
3013 sk->sk_peer_cred = NULL;
3014 sk->sk_write_pending = 0;
3015 sk->sk_rcvlowat = 1;
3016 sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT;
3017 sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT;
3018
3019 sk->sk_stamp = SK_DEFAULT_STAMP;
3020 #if BITS_PER_LONG==32
3021 seqlock_init(&sk->sk_stamp_seq);
3022 #endif
3023 atomic_set(&sk->sk_zckey, 0);
3024
3025 #ifdef CONFIG_NET_RX_BUSY_POLL
3026 sk->sk_napi_id = 0;
3027 sk->sk_ll_usec = sysctl_net_busy_read;
3028 #endif
3029
3030 sk->sk_max_pacing_rate = ~0UL;
3031 sk->sk_pacing_rate = ~0UL;
3032 WRITE_ONCE(sk->sk_pacing_shift, 10);
3033 sk->sk_incoming_cpu = -1;
3034
3035 sk_rx_queue_clear(sk);
3036 /*
3037 * Before updating sk_refcnt, we must commit prior changes to memory
3038 * (Documentation/RCU/rculist_nulls.rst for details)
3039 */
3040 smp_wmb();
3041 refcount_set(&sk->sk_refcnt, 1);
3042 atomic_set(&sk->sk_drops, 0);
3043 }
3044 EXPORT_SYMBOL(sock_init_data);
3045
3046 void lock_sock_nested(struct sock *sk, int subclass)
3047 {
3048 might_sleep();
3049 spin_lock_bh(&sk->sk_lock.slock);
3050 if (sk->sk_lock.owned)
3051 __lock_sock(sk);
3052 sk->sk_lock.owned = 1;
3053 spin_unlock(&sk->sk_lock.slock);
3054 /*
3055 * The sk_lock has mutex_lock() semantics here:
3056 */
3057 mutex_acquire(&sk->sk_lock.dep_map, subclass, 0, _RET_IP_);
3058 local_bh_enable();
3059 }
3060 EXPORT_SYMBOL(lock_sock_nested);
3061
3062 void release_sock(struct sock *sk)
3063 {
3064 spin_lock_bh(&sk->sk_lock.slock);
3065 if (sk->sk_backlog.tail)
3066 __release_sock(sk);
3067
3068 /* Warning : release_cb() might need to release sk ownership,
3069 * ie call sock_release_ownership(sk) before us.
3070 */
3071 if (sk->sk_prot->release_cb)
3072 sk->sk_prot->release_cb(sk);
3073
3074 sock_release_ownership(sk);
3075 if (waitqueue_active(&sk->sk_lock.wq))
3076 wake_up(&sk->sk_lock.wq);
3077 spin_unlock_bh(&sk->sk_lock.slock);
3078 }
3079 EXPORT_SYMBOL(release_sock);
3080
3081 /**
3082 * lock_sock_fast - fast version of lock_sock
3083 * @sk: socket
3084 *
3085 * This version should be used for very small section, where process wont block
3086 * return false if fast path is taken:
3087 *
3088 * sk_lock.slock locked, owned = 0, BH disabled
3089 *
3090 * return true if slow path is taken:
3091 *
3092 * sk_lock.slock unlocked, owned = 1, BH enabled
3093 */
3094 bool lock_sock_fast(struct sock *sk) __acquires(&sk->sk_lock.slock)
3095 {
3096 might_sleep();
3097 spin_lock_bh(&sk->sk_lock.slock);
3098
3099 if (!sk->sk_lock.owned)
3100 /*
3101 * Note : We must disable BH
3102 */
3103 return false;
3104
3105 __lock_sock(sk);
3106 sk->sk_lock.owned = 1;
3107 spin_unlock(&sk->sk_lock.slock);
3108 /*
3109 * The sk_lock has mutex_lock() semantics here:
3110 */
3111 mutex_acquire(&sk->sk_lock.dep_map, 0, 0, _RET_IP_);
3112 __acquire(&sk->sk_lock.slock);
3113 local_bh_enable();
3114 return true;
3115 }
3116 EXPORT_SYMBOL(lock_sock_fast);
3117
3118 int sock_gettstamp(struct socket *sock, void __user *userstamp,
3119 bool timeval, bool time32)
3120 {
3121 struct sock *sk = sock->sk;
3122 struct timespec64 ts;
3123
3124 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
3125 ts = ktime_to_timespec64(sock_read_timestamp(sk));
3126 if (ts.tv_sec == -1)
3127 return -ENOENT;
3128 if (ts.tv_sec == 0) {
3129 ktime_t kt = ktime_get_real();
3130 sock_write_timestamp(sk, kt);
3131 ts = ktime_to_timespec64(kt);
3132 }
3133
3134 if (timeval)
3135 ts.tv_nsec /= 1000;
3136
3137 #ifdef CONFIG_COMPAT_32BIT_TIME
3138 if (time32)
3139 return put_old_timespec32(&ts, userstamp);
3140 #endif
3141 #ifdef CONFIG_SPARC64
3142 /* beware of padding in sparc64 timeval */
3143 if (timeval && !in_compat_syscall()) {
3144 struct __kernel_old_timeval __user tv = {
3145 .tv_sec = ts.tv_sec,
3146 .tv_usec = ts.tv_nsec,
3147 };
3148 if (copy_to_user(userstamp, &tv, sizeof(tv)))
3149 return -EFAULT;
3150 return 0;
3151 }
3152 #endif
3153 return put_timespec64(&ts, userstamp);
3154 }
3155 EXPORT_SYMBOL(sock_gettstamp);
3156
3157 void sock_enable_timestamp(struct sock *sk, enum sock_flags flag)
3158 {
3159 if (!sock_flag(sk, flag)) {
3160 unsigned long previous_flags = sk->sk_flags;
3161
3162 sock_set_flag(sk, flag);
3163 /*
3164 * we just set one of the two flags which require net
3165 * time stamping, but time stamping might have been on
3166 * already because of the other one
3167 */
3168 if (sock_needs_netstamp(sk) &&
3169 !(previous_flags & SK_FLAGS_TIMESTAMP))
3170 net_enable_timestamp();
3171 }
3172 }
3173
3174 int sock_recv_errqueue(struct sock *sk, struct msghdr *msg, int len,
3175 int level, int type)
3176 {
3177 struct sock_exterr_skb *serr;
3178 struct sk_buff *skb;
3179 int copied, err;
3180
3181 err = -EAGAIN;
3182 skb = sock_dequeue_err_skb(sk);
3183 if (skb == NULL)
3184 goto out;
3185
3186 copied = skb->len;
3187 if (copied > len) {
3188 msg->msg_flags |= MSG_TRUNC;
3189 copied = len;
3190 }
3191 err = skb_copy_datagram_msg(skb, 0, msg, copied);
3192 if (err)
3193 goto out_free_skb;
3194
3195 sock_recv_timestamp(msg, sk, skb);
3196
3197 serr = SKB_EXT_ERR(skb);
3198 put_cmsg(msg, level, type, sizeof(serr->ee), &serr->ee);
3199
3200 msg->msg_flags |= MSG_ERRQUEUE;
3201 err = copied;
3202
3203 out_free_skb:
3204 kfree_skb(skb);
3205 out:
3206 return err;
3207 }
3208 EXPORT_SYMBOL(sock_recv_errqueue);
3209
3210 /*
3211 * Get a socket option on an socket.
3212 *
3213 * FIX: POSIX 1003.1g is very ambiguous here. It states that
3214 * asynchronous errors should be reported by getsockopt. We assume
3215 * this means if you specify SO_ERROR (otherwise whats the point of it).
3216 */
3217 int sock_common_getsockopt(struct socket *sock, int level, int optname,
3218 char __user *optval, int __user *optlen)
3219 {
3220 struct sock *sk = sock->sk;
3221
3222 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
3223 }
3224 EXPORT_SYMBOL(sock_common_getsockopt);
3225
3226 int sock_common_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
3227 int flags)
3228 {
3229 struct sock *sk = sock->sk;
3230 int addr_len = 0;
3231 int err;
3232
3233 err = sk->sk_prot->recvmsg(sk, msg, size, flags & MSG_DONTWAIT,
3234 flags & ~MSG_DONTWAIT, &addr_len);
3235 if (err >= 0)
3236 msg->msg_namelen = addr_len;
3237 return err;
3238 }
3239 EXPORT_SYMBOL(sock_common_recvmsg);
3240
3241 /*
3242 * Set socket options on an inet socket.
3243 */
3244 int sock_common_setsockopt(struct socket *sock, int level, int optname,
3245 sockptr_t optval, unsigned int optlen)
3246 {
3247 struct sock *sk = sock->sk;
3248
3249 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
3250 }
3251 EXPORT_SYMBOL(sock_common_setsockopt);
3252
3253 void sk_common_release(struct sock *sk)
3254 {
3255 if (sk->sk_prot->destroy)
3256 sk->sk_prot->destroy(sk);
3257
3258 /*
3259 * Observation: when sk_common_release is called, processes have
3260 * no access to socket. But net still has.
3261 * Step one, detach it from networking:
3262 *
3263 * A. Remove from hash tables.
3264 */
3265
3266 sk->sk_prot->unhash(sk);
3267
3268 /*
3269 * In this point socket cannot receive new packets, but it is possible
3270 * that some packets are in flight because some CPU runs receiver and
3271 * did hash table lookup before we unhashed socket. They will achieve
3272 * receive queue and will be purged by socket destructor.
3273 *
3274 * Also we still have packets pending on receive queue and probably,
3275 * our own packets waiting in device queues. sock_destroy will drain
3276 * receive queue, but transmitted packets will delay socket destruction
3277 * until the last reference will be released.
3278 */
3279
3280 sock_orphan(sk);
3281
3282 xfrm_sk_free_policy(sk);
3283
3284 sk_refcnt_debug_release(sk);
3285
3286 sock_put(sk);
3287 }
3288 EXPORT_SYMBOL(sk_common_release);
3289
3290 void sk_get_meminfo(const struct sock *sk, u32 *mem)
3291 {
3292 memset(mem, 0, sizeof(*mem) * SK_MEMINFO_VARS);
3293
3294 mem[SK_MEMINFO_RMEM_ALLOC] = sk_rmem_alloc_get(sk);
3295 mem[SK_MEMINFO_RCVBUF] = READ_ONCE(sk->sk_rcvbuf);
3296 mem[SK_MEMINFO_WMEM_ALLOC] = sk_wmem_alloc_get(sk);
3297 mem[SK_MEMINFO_SNDBUF] = READ_ONCE(sk->sk_sndbuf);
3298 mem[SK_MEMINFO_FWD_ALLOC] = sk->sk_forward_alloc;
3299 mem[SK_MEMINFO_WMEM_QUEUED] = READ_ONCE(sk->sk_wmem_queued);
3300 mem[SK_MEMINFO_OPTMEM] = atomic_read(&sk->sk_omem_alloc);
3301 mem[SK_MEMINFO_BACKLOG] = READ_ONCE(sk->sk_backlog.len);
3302 mem[SK_MEMINFO_DROPS] = atomic_read(&sk->sk_drops);
3303 }
3304
3305 #ifdef CONFIG_PROC_FS
3306 #define PROTO_INUSE_NR 64 /* should be enough for the first time */
3307 struct prot_inuse {
3308 int val[PROTO_INUSE_NR];
3309 };
3310
3311 static DECLARE_BITMAP(proto_inuse_idx, PROTO_INUSE_NR);
3312
3313 void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
3314 {
3315 __this_cpu_add(net->core.prot_inuse->val[prot->inuse_idx], val);
3316 }
3317 EXPORT_SYMBOL_GPL(sock_prot_inuse_add);
3318
3319 int sock_prot_inuse_get(struct net *net, struct proto *prot)
3320 {
3321 int cpu, idx = prot->inuse_idx;
3322 int res = 0;
3323
3324 for_each_possible_cpu(cpu)
3325 res += per_cpu_ptr(net->core.prot_inuse, cpu)->val[idx];
3326
3327 return res >= 0 ? res : 0;
3328 }
3329 EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
3330
3331 static void sock_inuse_add(struct net *net, int val)
3332 {
3333 this_cpu_add(*net->core.sock_inuse, val);
3334 }
3335
3336 int sock_inuse_get(struct net *net)
3337 {
3338 int cpu, res = 0;
3339
3340 for_each_possible_cpu(cpu)
3341 res += *per_cpu_ptr(net->core.sock_inuse, cpu);
3342
3343 return res;
3344 }
3345
3346 EXPORT_SYMBOL_GPL(sock_inuse_get);
3347
3348 static int __net_init sock_inuse_init_net(struct net *net)
3349 {
3350 net->core.prot_inuse = alloc_percpu(struct prot_inuse);
3351 if (net->core.prot_inuse == NULL)
3352 return -ENOMEM;
3353
3354 net->core.sock_inuse = alloc_percpu(int);
3355 if (net->core.sock_inuse == NULL)
3356 goto out;
3357
3358 return 0;
3359
3360 out:
3361 free_percpu(net->core.prot_inuse);
3362 return -ENOMEM;
3363 }
3364
3365 static void __net_exit sock_inuse_exit_net(struct net *net)
3366 {
3367 free_percpu(net->core.prot_inuse);
3368 free_percpu(net->core.sock_inuse);
3369 }
3370
3371 static struct pernet_operations net_inuse_ops = {
3372 .init = sock_inuse_init_net,
3373 .exit = sock_inuse_exit_net,
3374 };
3375
3376 static __init int net_inuse_init(void)
3377 {
3378 if (register_pernet_subsys(&net_inuse_ops))
3379 panic("Cannot initialize net inuse counters");
3380
3381 return 0;
3382 }
3383
3384 core_initcall(net_inuse_init);
3385
3386 static int assign_proto_idx(struct proto *prot)
3387 {
3388 prot->inuse_idx = find_first_zero_bit(proto_inuse_idx, PROTO_INUSE_NR);
3389
3390 if (unlikely(prot->inuse_idx == PROTO_INUSE_NR - 1)) {
3391 pr_err("PROTO_INUSE_NR exhausted\n");
3392 return -ENOSPC;
3393 }
3394
3395 set_bit(prot->inuse_idx, proto_inuse_idx);
3396 return 0;
3397 }
3398
3399 static void release_proto_idx(struct proto *prot)
3400 {
3401 if (prot->inuse_idx != PROTO_INUSE_NR - 1)
3402 clear_bit(prot->inuse_idx, proto_inuse_idx);
3403 }
3404 #else
3405 static inline int assign_proto_idx(struct proto *prot)
3406 {
3407 return 0;
3408 }
3409
3410 static inline void release_proto_idx(struct proto *prot)
3411 {
3412 }
3413
3414 static void sock_inuse_add(struct net *net, int val)
3415 {
3416 }
3417 #endif
3418
3419 static void tw_prot_cleanup(struct timewait_sock_ops *twsk_prot)
3420 {
3421 if (!twsk_prot)
3422 return;
3423 kfree(twsk_prot->twsk_slab_name);
3424 twsk_prot->twsk_slab_name = NULL;
3425 kmem_cache_destroy(twsk_prot->twsk_slab);
3426 twsk_prot->twsk_slab = NULL;
3427 }
3428
3429 static void req_prot_cleanup(struct request_sock_ops *rsk_prot)
3430 {
3431 if (!rsk_prot)
3432 return;
3433 kfree(rsk_prot->slab_name);
3434 rsk_prot->slab_name = NULL;
3435 kmem_cache_destroy(rsk_prot->slab);
3436 rsk_prot->slab = NULL;
3437 }
3438
3439 static int req_prot_init(const struct proto *prot)
3440 {
3441 struct request_sock_ops *rsk_prot = prot->rsk_prot;
3442
3443 if (!rsk_prot)
3444 return 0;
3445
3446 rsk_prot->slab_name = kasprintf(GFP_KERNEL, "request_sock_%s",
3447 prot->name);
3448 if (!rsk_prot->slab_name)
3449 return -ENOMEM;
3450
3451 rsk_prot->slab = kmem_cache_create(rsk_prot->slab_name,
3452 rsk_prot->obj_size, 0,
3453 SLAB_ACCOUNT | prot->slab_flags,
3454 NULL);
3455
3456 if (!rsk_prot->slab) {
3457 pr_crit("%s: Can't create request sock SLAB cache!\n",
3458 prot->name);
3459 return -ENOMEM;
3460 }
3461 return 0;
3462 }
3463
3464 int proto_register(struct proto *prot, int alloc_slab)
3465 {
3466 int ret = -ENOBUFS;
3467
3468 if (alloc_slab) {
3469 prot->slab = kmem_cache_create_usercopy(prot->name,
3470 prot->obj_size, 0,
3471 SLAB_HWCACHE_ALIGN | SLAB_ACCOUNT |
3472 prot->slab_flags,
3473 prot->useroffset, prot->usersize,
3474 NULL);
3475
3476 if (prot->slab == NULL) {
3477 pr_crit("%s: Can't create sock SLAB cache!\n",
3478 prot->name);
3479 goto out;
3480 }
3481
3482 if (req_prot_init(prot))
3483 goto out_free_request_sock_slab;
3484
3485 if (prot->twsk_prot != NULL) {
3486 prot->twsk_prot->twsk_slab_name = kasprintf(GFP_KERNEL, "tw_sock_%s", prot->name);
3487
3488 if (prot->twsk_prot->twsk_slab_name == NULL)
3489 goto out_free_request_sock_slab;
3490
3491 prot->twsk_prot->twsk_slab =
3492 kmem_cache_create(prot->twsk_prot->twsk_slab_name,
3493 prot->twsk_prot->twsk_obj_size,
3494 0,
3495 SLAB_ACCOUNT |
3496 prot->slab_flags,
3497 NULL);
3498 if (prot->twsk_prot->twsk_slab == NULL)
3499 goto out_free_timewait_sock_slab;
3500 }
3501 }
3502
3503 mutex_lock(&proto_list_mutex);
3504 ret = assign_proto_idx(prot);
3505 if (ret) {
3506 mutex_unlock(&proto_list_mutex);
3507 goto out_free_timewait_sock_slab;
3508 }
3509 list_add(&prot->node, &proto_list);
3510 mutex_unlock(&proto_list_mutex);
3511 return ret;
3512
3513 out_free_timewait_sock_slab:
3514 if (alloc_slab && prot->twsk_prot)
3515 tw_prot_cleanup(prot->twsk_prot);
3516 out_free_request_sock_slab:
3517 if (alloc_slab) {
3518 req_prot_cleanup(prot->rsk_prot);
3519
3520 kmem_cache_destroy(prot->slab);
3521 prot->slab = NULL;
3522 }
3523 out:
3524 return ret;
3525 }
3526 EXPORT_SYMBOL(proto_register);
3527
3528 void proto_unregister(struct proto *prot)
3529 {
3530 mutex_lock(&proto_list_mutex);
3531 release_proto_idx(prot);
3532 list_del(&prot->node);
3533 mutex_unlock(&proto_list_mutex);
3534
3535 kmem_cache_destroy(prot->slab);
3536 prot->slab = NULL;
3537
3538 req_prot_cleanup(prot->rsk_prot);
3539 tw_prot_cleanup(prot->twsk_prot);
3540 }
3541 EXPORT_SYMBOL(proto_unregister);
3542
3543 int sock_load_diag_module(int family, int protocol)
3544 {
3545 if (!protocol) {
3546 if (!sock_is_registered(family))
3547 return -ENOENT;
3548
3549 return request_module("net-pf-%d-proto-%d-type-%d", PF_NETLINK,
3550 NETLINK_SOCK_DIAG, family);
3551 }
3552
3553 #ifdef CONFIG_INET
3554 if (family == AF_INET &&
3555 protocol != IPPROTO_RAW &&
3556 protocol < MAX_INET_PROTOS &&
3557 !rcu_access_pointer(inet_protos[protocol]))
3558 return -ENOENT;
3559 #endif
3560
3561 return request_module("net-pf-%d-proto-%d-type-%d-%d", PF_NETLINK,
3562 NETLINK_SOCK_DIAG, family, protocol);
3563 }
3564 EXPORT_SYMBOL(sock_load_diag_module);
3565
3566 #ifdef CONFIG_PROC_FS
3567 static void *proto_seq_start(struct seq_file *seq, loff_t *pos)
3568 __acquires(proto_list_mutex)
3569 {
3570 mutex_lock(&proto_list_mutex);
3571 return seq_list_start_head(&proto_list, *pos);
3572 }
3573
3574 static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3575 {
3576 return seq_list_next(v, &proto_list, pos);
3577 }
3578
3579 static void proto_seq_stop(struct seq_file *seq, void *v)
3580 __releases(proto_list_mutex)
3581 {
3582 mutex_unlock(&proto_list_mutex);
3583 }
3584
3585 static char proto_method_implemented(const void *method)
3586 {
3587 return method == NULL ? 'n' : 'y';
3588 }
3589 static long sock_prot_memory_allocated(struct proto *proto)
3590 {
3591 return proto->memory_allocated != NULL ? proto_memory_allocated(proto) : -1L;
3592 }
3593
3594 static const char *sock_prot_memory_pressure(struct proto *proto)
3595 {
3596 return proto->memory_pressure != NULL ?
3597 proto_memory_pressure(proto) ? "yes" : "no" : "NI";
3598 }
3599
3600 static void proto_seq_printf(struct seq_file *seq, struct proto *proto)
3601 {
3602
3603 seq_printf(seq, "%-9s %4u %6d %6ld %-3s %6u %-3s %-10s "
3604 "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n",
3605 proto->name,
3606 proto->obj_size,
3607 sock_prot_inuse_get(seq_file_net(seq), proto),
3608 sock_prot_memory_allocated(proto),
3609 sock_prot_memory_pressure(proto),
3610 proto->max_header,
3611 proto->slab == NULL ? "no" : "yes",
3612 module_name(proto->owner),
3613 proto_method_implemented(proto->close),
3614 proto_method_implemented(proto->connect),
3615 proto_method_implemented(proto->disconnect),
3616 proto_method_implemented(proto->accept),
3617 proto_method_implemented(proto->ioctl),
3618 proto_method_implemented(proto->init),
3619 proto_method_implemented(proto->destroy),
3620 proto_method_implemented(proto->shutdown),
3621 proto_method_implemented(proto->setsockopt),
3622 proto_method_implemented(proto->getsockopt),
3623 proto_method_implemented(proto->sendmsg),
3624 proto_method_implemented(proto->recvmsg),
3625 proto_method_implemented(proto->sendpage),
3626 proto_method_implemented(proto->bind),
3627 proto_method_implemented(proto->backlog_rcv),
3628 proto_method_implemented(proto->hash),
3629 proto_method_implemented(proto->unhash),
3630 proto_method_implemented(proto->get_port),
3631 proto_method_implemented(proto->enter_memory_pressure));
3632 }
3633
3634 static int proto_seq_show(struct seq_file *seq, void *v)
3635 {
3636 if (v == &proto_list)
3637 seq_printf(seq, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s",
3638 "protocol",
3639 "size",
3640 "sockets",
3641 "memory",
3642 "press",
3643 "maxhdr",
3644 "slab",
3645 "module",
3646 "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n");
3647 else
3648 proto_seq_printf(seq, list_entry(v, struct proto, node));
3649 return 0;
3650 }
3651
3652 static const struct seq_operations proto_seq_ops = {
3653 .start = proto_seq_start,
3654 .next = proto_seq_next,
3655 .stop = proto_seq_stop,
3656 .show = proto_seq_show,
3657 };
3658
3659 static __net_init int proto_init_net(struct net *net)
3660 {
3661 if (!proc_create_net("protocols", 0444, net->proc_net, &proto_seq_ops,
3662 sizeof(struct seq_net_private)))
3663 return -ENOMEM;
3664
3665 return 0;
3666 }
3667
3668 static __net_exit void proto_exit_net(struct net *net)
3669 {
3670 remove_proc_entry("protocols", net->proc_net);
3671 }
3672
3673
3674 static __net_initdata struct pernet_operations proto_net_ops = {
3675 .init = proto_init_net,
3676 .exit = proto_exit_net,
3677 };
3678
3679 static int __init proto_init(void)
3680 {
3681 return register_pernet_subsys(&proto_net_ops);
3682 }
3683
3684 subsys_initcall(proto_init);
3685
3686 #endif /* PROC_FS */
3687
3688 #ifdef CONFIG_NET_RX_BUSY_POLL
3689 bool sk_busy_loop_end(void *p, unsigned long start_time)
3690 {
3691 struct sock *sk = p;
3692
3693 return !skb_queue_empty_lockless(&sk->sk_receive_queue) ||
3694 sk_busy_loop_timeout(sk, start_time);
3695 }
3696 EXPORT_SYMBOL(sk_busy_loop_end);
3697 #endif /* CONFIG_NET_RX_BUSY_POLL */
3698
3699 int sock_bind_add(struct sock *sk, struct sockaddr *addr, int addr_len)
3700 {
3701 if (!sk->sk_prot->bind_add)
3702 return -EOPNOTSUPP;
3703 return sk->sk_prot->bind_add(sk, addr, addr_len);
3704 }
3705 EXPORT_SYMBOL(sock_bind_add);
Linux with added FPC-III support