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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * INET An implementation of the TCP/IP protocol suite for the LINUX
4 * operating system. INET is implemented using the BSD Socket
5 * interface as the means of communication with the user level.
6 *
7 * Generic socket support routines. Memory allocators, socket lock/release
8 * handler for protocols to use and generic option handler.
9 *
10 * Authors: Ross Biro
11 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
12 * Florian La Roche, <flla@stud.uni-sb.de>
13 * Alan Cox, <A.Cox@swansea.ac.uk>
14 *
15 * Fixes:
16 * Alan Cox : Numerous verify_area() problems
17 * Alan Cox : Connecting on a connecting socket
18 * now returns an error for tcp.
19 * Alan Cox : sock->protocol is set correctly.
20 * and is not sometimes left as 0.
21 * Alan Cox : connect handles icmp errors on a
22 * connect properly. Unfortunately there
23 * is a restart syscall nasty there. I
24 * can't match BSD without hacking the C
25 * library. Ideas urgently sought!
26 * Alan Cox : Disallow bind() to addresses that are
27 * not ours - especially broadcast ones!!
28 * Alan Cox : Socket 1024 _IS_ ok for users. (fencepost)
29 * Alan Cox : sock_wfree/sock_rfree don't destroy sockets,
30 * instead they leave that for the DESTROY timer.
31 * Alan Cox : Clean up error flag in accept
32 * Alan Cox : TCP ack handling is buggy, the DESTROY timer
33 * was buggy. Put a remove_sock() in the handler
34 * for memory when we hit 0. Also altered the timer
35 * code. The ACK stuff can wait and needs major
36 * TCP layer surgery.
37 * Alan Cox : Fixed TCP ack bug, removed remove sock
38 * and fixed timer/inet_bh race.
39 * Alan Cox : Added zapped flag for TCP
40 * Alan Cox : Move kfree_skb into skbuff.c and tidied up surplus code
41 * Alan Cox : for new sk_buff allocations wmalloc/rmalloc now call alloc_skb
42 * Alan Cox : kfree_s calls now are kfree_skbmem so we can track skb resources
43 * Alan Cox : Supports socket option broadcast now as does udp. Packet and raw need fixing.
44 * Alan Cox : Added RCVBUF,SNDBUF size setting. It suddenly occurred to me how easy it was so...
45 * Rick Sladkey : Relaxed UDP rules for matching packets.
46 * C.E.Hawkins : IFF_PROMISC/SIOCGHWADDR support
47 * Pauline Middelink : identd support
48 * Alan Cox : Fixed connect() taking signals I think.
49 * Alan Cox : SO_LINGER supported
50 * Alan Cox : Error reporting fixes
51 * Anonymous : inet_create tidied up (sk->reuse setting)
52 * Alan Cox : inet sockets don't set sk->type!
53 * Alan Cox : Split socket option code
54 * Alan Cox : Callbacks
55 * Alan Cox : Nagle flag for Charles & Johannes stuff
56 * Alex : Removed restriction on inet fioctl
57 * Alan Cox : Splitting INET from NET core
58 * Alan Cox : Fixed bogus SO_TYPE handling in getsockopt()
59 * Adam Caldwell : Missing return in SO_DONTROUTE/SO_DEBUG code
60 * Alan Cox : Split IP from generic code
61 * Alan Cox : New kfree_skbmem()
62 * Alan Cox : Make SO_DEBUG superuser only.
63 * Alan Cox : Allow anyone to clear SO_DEBUG
64 * (compatibility fix)
65 * Alan Cox : Added optimistic memory grabbing for AF_UNIX throughput.
66 * Alan Cox : Allocator for a socket is settable.
67 * Alan Cox : SO_ERROR includes soft errors.
68 * Alan Cox : Allow NULL arguments on some SO_ opts
69 * Alan Cox : Generic socket allocation to make hooks
70 * easier (suggested by Craig Metz).
71 * Michael Pall : SO_ERROR returns positive errno again
72 * Steve Whitehouse: Added default destructor to free
73 * protocol private data.
74 * Steve Whitehouse: Added various other default routines
75 * common to several socket families.
76 * Chris Evans : Call suser() check last on F_SETOWN
77 * Jay Schulist : Added SO_ATTACH_FILTER and SO_DETACH_FILTER.
78 * Andi Kleen : Add sock_kmalloc()/sock_kfree_s()
79 * Andi Kleen : Fix write_space callback
80 * Chris Evans : Security fixes - signedness again
81 * Arnaldo C. Melo : cleanups, use skb_queue_purge
82 *
83 * To Fix:
84 */
85
86#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
87
88#include <asm/unaligned.h>
89#include <linux/capability.h>
90#include <linux/errno.h>
91#include <linux/errqueue.h>
92#include <linux/types.h>
93#include <linux/socket.h>
94#include <linux/in.h>
95#include <linux/kernel.h>
96#include <linux/module.h>
97#include <linux/proc_fs.h>
98#include <linux/seq_file.h>
99#include <linux/sched.h>
100#include <linux/sched/mm.h>
101#include <linux/timer.h>
102#include <linux/string.h>
103#include <linux/sockios.h>
104#include <linux/net.h>
105#include <linux/mm.h>
106#include <linux/slab.h>
107#include <linux/interrupt.h>
108#include <linux/poll.h>
109#include <linux/tcp.h>
110#include <linux/init.h>
111#include <linux/highmem.h>
112#include <linux/user_namespace.h>
113#include <linux/static_key.h>
114#include <linux/memcontrol.h>
115#include <linux/prefetch.h>
116
117#include <linux/uaccess.h>
118
119#include <linux/netdevice.h>
120#include <net/protocol.h>
121#include <linux/skbuff.h>
122#include <net/net_namespace.h>
123#include <net/request_sock.h>
124#include <net/sock.h>
125#include <linux/net_tstamp.h>
126#include <net/xfrm.h>
127#include <linux/ipsec.h>
128#include <net/cls_cgroup.h>
129#include <net/netprio_cgroup.h>
130#include <linux/sock_diag.h>
131
132#include <linux/filter.h>
133#include <net/sock_reuseport.h>
134#include <net/bpf_sk_storage.h>
135
136#include <trace/events/sock.h>
137
138#include <net/tcp.h>
139#include <net/busy_poll.h>
140
141static DEFINE_MUTEX(proto_list_mutex);
142static LIST_HEAD(proto_list);
143
144static void sock_inuse_add(struct net *net, int val);
145
146/**
147 * sk_ns_capable - General socket capability test
148 * @sk: Socket to use a capability on or through
149 * @user_ns: The user namespace of the capability to use
150 * @cap: The capability to use
151 *
152 * Test to see if the opener of the socket had when the socket was
153 * created and the current process has the capability @cap in the user
154 * namespace @user_ns.
155 */
156bool sk_ns_capable(const struct sock *sk,
157 struct user_namespace *user_ns, int cap)
158{
159 return file_ns_capable(sk->sk_socket->file, user_ns, cap) &&
160 ns_capable(user_ns, cap);
161}
162EXPORT_SYMBOL(sk_ns_capable);
163
164/**
165 * sk_capable - Socket global capability test
166 * @sk: Socket to use a capability on or through
167 * @cap: The global capability to use
168 *
169 * Test to see if the opener of the socket had when the socket was
170 * created and the current process has the capability @cap in all user
171 * namespaces.
172 */
173bool sk_capable(const struct sock *sk, int cap)
174{
175 return sk_ns_capable(sk, &init_user_ns, cap);
176}
177EXPORT_SYMBOL(sk_capable);
178
179/**
180 * sk_net_capable - Network namespace socket capability test
181 * @sk: Socket to use a capability on or through
182 * @cap: The capability to use
183 *
184 * Test to see if the opener of the socket had when the socket was created
185 * and the current process has the capability @cap over the network namespace
186 * the socket is a member of.
187 */
188bool sk_net_capable(const struct sock *sk, int cap)
189{
190 return sk_ns_capable(sk, sock_net(sk)->user_ns, cap);
191}
192EXPORT_SYMBOL(sk_net_capable);
193
194/*
195 * Each address family might have different locking rules, so we have
196 * one slock key per address family and separate keys for internal and
197 * userspace sockets.
198 */
199static struct lock_class_key af_family_keys[AF_MAX];
200static struct lock_class_key af_family_kern_keys[AF_MAX];
201static struct lock_class_key af_family_slock_keys[AF_MAX];
202static struct lock_class_key af_family_kern_slock_keys[AF_MAX];
203
204/*
205 * Make lock validator output more readable. (we pre-construct these
206 * strings build-time, so that runtime initialization of socket
207 * locks is fast):
208 */
209
210#define _sock_locks(x) \
211 x "AF_UNSPEC", x "AF_UNIX" , x "AF_INET" , \
212 x "AF_AX25" , x "AF_IPX" , x "AF_APPLETALK", \
213 x "AF_NETROM", x "AF_BRIDGE" , x "AF_ATMPVC" , \
214 x "AF_X25" , x "AF_INET6" , x "AF_ROSE" , \
215 x "AF_DECnet", x "AF_NETBEUI" , x "AF_SECURITY" , \
216 x "AF_KEY" , x "AF_NETLINK" , x "AF_PACKET" , \
217 x "AF_ASH" , x "AF_ECONET" , x "AF_ATMSVC" , \
218 x "AF_RDS" , x "AF_SNA" , x "AF_IRDA" , \
219 x "AF_PPPOX" , x "AF_WANPIPE" , x "AF_LLC" , \
220 x "27" , x "28" , x "AF_CAN" , \
221 x "AF_TIPC" , x "AF_BLUETOOTH", x "IUCV" , \
222 x "AF_RXRPC" , x "AF_ISDN" , x "AF_PHONET" , \
223 x "AF_IEEE802154", x "AF_CAIF" , x "AF_ALG" , \
224 x "AF_NFC" , x "AF_VSOCK" , x "AF_KCM" , \
225 x "AF_QIPCRTR", x "AF_SMC" , x "AF_XDP" , \
226 x "AF_MAX"
227
228static const char *const af_family_key_strings[AF_MAX+1] = {
229 _sock_locks("sk_lock-")
230};
231static const char *const af_family_slock_key_strings[AF_MAX+1] = {
232 _sock_locks("slock-")
233};
234static const char *const af_family_clock_key_strings[AF_MAX+1] = {
235 _sock_locks("clock-")
236};
237
238static const char *const af_family_kern_key_strings[AF_MAX+1] = {
239 _sock_locks("k-sk_lock-")
240};
241static const char *const af_family_kern_slock_key_strings[AF_MAX+1] = {
242 _sock_locks("k-slock-")
243};
244static const char *const af_family_kern_clock_key_strings[AF_MAX+1] = {
245 _sock_locks("k-clock-")
246};
247static const char *const af_family_rlock_key_strings[AF_MAX+1] = {
248 _sock_locks("rlock-")
249};
250static const char *const af_family_wlock_key_strings[AF_MAX+1] = {
251 _sock_locks("wlock-")
252};
253static const char *const af_family_elock_key_strings[AF_MAX+1] = {
254 _sock_locks("elock-")
255};
256
257/*
258 * sk_callback_lock and sk queues locking rules are per-address-family,
259 * so split the lock classes by using a per-AF key:
260 */
261static struct lock_class_key af_callback_keys[AF_MAX];
262static struct lock_class_key af_rlock_keys[AF_MAX];
263static struct lock_class_key af_wlock_keys[AF_MAX];
264static struct lock_class_key af_elock_keys[AF_MAX];
265static struct lock_class_key af_kern_callback_keys[AF_MAX];
266
267/* Run time adjustable parameters. */
268__u32 sysctl_wmem_max __read_mostly = SK_WMEM_MAX;
269EXPORT_SYMBOL(sysctl_wmem_max);
270__u32 sysctl_rmem_max __read_mostly = SK_RMEM_MAX;
271EXPORT_SYMBOL(sysctl_rmem_max);
272__u32 sysctl_wmem_default __read_mostly = SK_WMEM_MAX;
273__u32 sysctl_rmem_default __read_mostly = SK_RMEM_MAX;
274
275/* Maximal space eaten by iovec or ancillary data plus some space */
276int sysctl_optmem_max __read_mostly = sizeof(unsigned long)*(2*UIO_MAXIOV+512);
277EXPORT_SYMBOL(sysctl_optmem_max);
278
279int sysctl_tstamp_allow_data __read_mostly = 1;
280
281DEFINE_STATIC_KEY_FALSE(memalloc_socks_key);
282EXPORT_SYMBOL_GPL(memalloc_socks_key);
283
284/**
285 * sk_set_memalloc - sets %SOCK_MEMALLOC
286 * @sk: socket to set it on
287 *
288 * Set %SOCK_MEMALLOC on a socket for access to emergency reserves.
289 * It's the responsibility of the admin to adjust min_free_kbytes
290 * to meet the requirements
291 */
292void sk_set_memalloc(struct sock *sk)
293{
294 sock_set_flag(sk, SOCK_MEMALLOC);
295 sk->sk_allocation |= __GFP_MEMALLOC;
296 static_branch_inc(&memalloc_socks_key);
297}
298EXPORT_SYMBOL_GPL(sk_set_memalloc);
299
300void sk_clear_memalloc(struct sock *sk)
301{
302 sock_reset_flag(sk, SOCK_MEMALLOC);
303 sk->sk_allocation &= ~__GFP_MEMALLOC;
304 static_branch_dec(&memalloc_socks_key);
305
306 /*
307 * SOCK_MEMALLOC is allowed to ignore rmem limits to ensure forward
308 * progress of swapping. SOCK_MEMALLOC may be cleared while
309 * it has rmem allocations due to the last swapfile being deactivated
310 * but there is a risk that the socket is unusable due to exceeding
311 * the rmem limits. Reclaim the reserves and obey rmem limits again.
312 */
313 sk_mem_reclaim(sk);
314}
315EXPORT_SYMBOL_GPL(sk_clear_memalloc);
316
317int __sk_backlog_rcv(struct sock *sk, struct sk_buff *skb)
318{
319 int ret;
320 unsigned int noreclaim_flag;
321
322 /* these should have been dropped before queueing */
323 BUG_ON(!sock_flag(sk, SOCK_MEMALLOC));
324
325 noreclaim_flag = memalloc_noreclaim_save();
326 ret = sk->sk_backlog_rcv(sk, skb);
327 memalloc_noreclaim_restore(noreclaim_flag);
328
329 return ret;
330}
331EXPORT_SYMBOL(__sk_backlog_rcv);
332
333static int sock_get_timeout(long timeo, void *optval, bool old_timeval)
334{
335 struct __kernel_sock_timeval tv;
336 int size;
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 size = sizeof(old_tv);
358 } else {
359 *(struct __kernel_sock_timeval *)optval = tv;
360 size = sizeof(tv);
361 }
362
363 return size;
364}
365
366static int sock_set_timeout(long *timeo_p, char __user *optval, int optlen, bool old_timeval)
367{
368 struct __kernel_sock_timeval tv;
369
370 if (old_timeval && in_compat_syscall() && !COMPAT_USE_64BIT_TIME) {
371 struct old_timeval32 tv32;
372
373 if (optlen < sizeof(tv32))
374 return -EINVAL;
375
376 if (copy_from_user(&tv32, optval, sizeof(tv32)))
377 return -EFAULT;
378 tv.tv_sec = tv32.tv_sec;
379 tv.tv_usec = tv32.tv_usec;
380 } else if (old_timeval) {
381 struct __kernel_old_timeval old_tv;
382
383 if (optlen < sizeof(old_tv))
384 return -EINVAL;
385 if (copy_from_user(&old_tv, optval, sizeof(old_tv)))
386 return -EFAULT;
387 tv.tv_sec = old_tv.tv_sec;
388 tv.tv_usec = old_tv.tv_usec;
389 } else {
390 if (optlen < sizeof(tv))
391 return -EINVAL;
392 if (copy_from_user(&tv, optval, sizeof(tv)))
393 return -EFAULT;
394 }
395 if (tv.tv_usec < 0 || tv.tv_usec >= USEC_PER_SEC)
396 return -EDOM;
397
398 if (tv.tv_sec < 0) {
399 static int warned __read_mostly;
400
401 *timeo_p = 0;
402 if (warned < 10 && net_ratelimit()) {
403 warned++;
404 pr_info("%s: `%s' (pid %d) tries to set negative timeout\n",
405 __func__, current->comm, task_pid_nr(current));
406 }
407 return 0;
408 }
409 *timeo_p = MAX_SCHEDULE_TIMEOUT;
410 if (tv.tv_sec == 0 && tv.tv_usec == 0)
411 return 0;
412 if (tv.tv_sec < (MAX_SCHEDULE_TIMEOUT / HZ - 1))
413 *timeo_p = tv.tv_sec * HZ + DIV_ROUND_UP((unsigned long)tv.tv_usec, USEC_PER_SEC / HZ);
414 return 0;
415}
416
417static void sock_warn_obsolete_bsdism(const char *name)
418{
419 static int warned;
420 static char warncomm[TASK_COMM_LEN];
421 if (strcmp(warncomm, current->comm) && warned < 5) {
422 strcpy(warncomm, current->comm);
423 pr_warn("process `%s' is using obsolete %s SO_BSDCOMPAT\n",
424 warncomm, name);
425 warned++;
426 }
427}
428
429static bool sock_needs_netstamp(const struct sock *sk)
430{
431 switch (sk->sk_family) {
432 case AF_UNSPEC:
433 case AF_UNIX:
434 return false;
435 default:
436 return true;
437 }
438}
439
440static void sock_disable_timestamp(struct sock *sk, unsigned long flags)
441{
442 if (sk->sk_flags & flags) {
443 sk->sk_flags &= ~flags;
444 if (sock_needs_netstamp(sk) &&
445 !(sk->sk_flags & SK_FLAGS_TIMESTAMP))
446 net_disable_timestamp();
447 }
448}
449
450
451int __sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
452{
453 unsigned long flags;
454 struct sk_buff_head *list = &sk->sk_receive_queue;
455
456 if (atomic_read(&sk->sk_rmem_alloc) >= sk->sk_rcvbuf) {
457 atomic_inc(&sk->sk_drops);
458 trace_sock_rcvqueue_full(sk, skb);
459 return -ENOMEM;
460 }
461
462 if (!sk_rmem_schedule(sk, skb, skb->truesize)) {
463 atomic_inc(&sk->sk_drops);
464 return -ENOBUFS;
465 }
466
467 skb->dev = NULL;
468 skb_set_owner_r(skb, sk);
469
470 /* we escape from rcu protected region, make sure we dont leak
471 * a norefcounted dst
472 */
473 skb_dst_force(skb);
474
475 spin_lock_irqsave(&list->lock, flags);
476 sock_skb_set_dropcount(sk, skb);
477 __skb_queue_tail(list, skb);
478 spin_unlock_irqrestore(&list->lock, flags);
479
480 if (!sock_flag(sk, SOCK_DEAD))
481 sk->sk_data_ready(sk);
482 return 0;
483}
484EXPORT_SYMBOL(__sock_queue_rcv_skb);
485
486int sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
487{
488 int err;
489
490 err = sk_filter(sk, skb);
491 if (err)
492 return err;
493
494 return __sock_queue_rcv_skb(sk, skb);
495}
496EXPORT_SYMBOL(sock_queue_rcv_skb);
497
498int __sk_receive_skb(struct sock *sk, struct sk_buff *skb,
499 const int nested, unsigned int trim_cap, bool refcounted)
500{
501 int rc = NET_RX_SUCCESS;
502
503 if (sk_filter_trim_cap(sk, skb, trim_cap))
504 goto discard_and_relse;
505
506 skb->dev = NULL;
507
508 if (sk_rcvqueues_full(sk, sk->sk_rcvbuf)) {
509 atomic_inc(&sk->sk_drops);
510 goto discard_and_relse;
511 }
512 if (nested)
513 bh_lock_sock_nested(sk);
514 else
515 bh_lock_sock(sk);
516 if (!sock_owned_by_user(sk)) {
517 /*
518 * trylock + unlock semantics:
519 */
520 mutex_acquire(&sk->sk_lock.dep_map, 0, 1, _RET_IP_);
521
522 rc = sk_backlog_rcv(sk, skb);
523
524 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_);
525 } else if (sk_add_backlog(sk, skb, READ_ONCE(sk->sk_rcvbuf))) {
526 bh_unlock_sock(sk);
527 atomic_inc(&sk->sk_drops);
528 goto discard_and_relse;
529 }
530
531 bh_unlock_sock(sk);
532out:
533 if (refcounted)
534 sock_put(sk);
535 return rc;
536discard_and_relse:
537 kfree_skb(skb);
538 goto out;
539}
540EXPORT_SYMBOL(__sk_receive_skb);
541
542struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie)
543{
544 struct dst_entry *dst = __sk_dst_get(sk);
545
546 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
547 sk_tx_queue_clear(sk);
548 sk->sk_dst_pending_confirm = 0;
549 RCU_INIT_POINTER(sk->sk_dst_cache, NULL);
550 dst_release(dst);
551 return NULL;
552 }
553
554 return dst;
555}
556EXPORT_SYMBOL(__sk_dst_check);
557
558struct dst_entry *sk_dst_check(struct sock *sk, u32 cookie)
559{
560 struct dst_entry *dst = sk_dst_get(sk);
561
562 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
563 sk_dst_reset(sk);
564 dst_release(dst);
565 return NULL;
566 }
567
568 return dst;
569}
570EXPORT_SYMBOL(sk_dst_check);
571
572static int sock_setbindtodevice_locked(struct sock *sk, int ifindex)
573{
574 int ret = -ENOPROTOOPT;
575#ifdef CONFIG_NETDEVICES
576 struct net *net = sock_net(sk);
577
578 /* Sorry... */
579 ret = -EPERM;
580 if (!ns_capable(net->user_ns, CAP_NET_RAW))
581 goto out;
582
583 ret = -EINVAL;
584 if (ifindex < 0)
585 goto out;
586
587 sk->sk_bound_dev_if = ifindex;
588 if (sk->sk_prot->rehash)
589 sk->sk_prot->rehash(sk);
590 sk_dst_reset(sk);
591
592 ret = 0;
593
594out:
595#endif
596
597 return ret;
598}
599
600static int sock_setbindtodevice(struct sock *sk, char __user *optval,
601 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_user(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 lock_sock(sk);
641 ret = sock_setbindtodevice_locked(sk, index);
642 release_sock(sk);
643
644out:
645#endif
646
647 return ret;
648}
649
650static int sock_getbindtodevice(struct sock *sk, char __user *optval,
651 int __user *optlen, int len)
652{
653 int ret = -ENOPROTOOPT;
654#ifdef CONFIG_NETDEVICES
655 struct net *net = sock_net(sk);
656 char devname[IFNAMSIZ];
657
658 if (sk->sk_bound_dev_if == 0) {
659 len = 0;
660 goto zero;
661 }
662
663 ret = -EINVAL;
664 if (len < IFNAMSIZ)
665 goto out;
666
667 ret = netdev_get_name(net, devname, sk->sk_bound_dev_if);
668 if (ret)
669 goto out;
670
671 len = strlen(devname) + 1;
672
673 ret = -EFAULT;
674 if (copy_to_user(optval, devname, len))
675 goto out;
676
677zero:
678 ret = -EFAULT;
679 if (put_user(len, optlen))
680 goto out;
681
682 ret = 0;
683
684out:
685#endif
686
687 return ret;
688}
689
690static inline void sock_valbool_flag(struct sock *sk, int bit, int valbool)
691{
692 if (valbool)
693 sock_set_flag(sk, bit);
694 else
695 sock_reset_flag(sk, bit);
696}
697
698bool sk_mc_loop(struct sock *sk)
699{
700 if (dev_recursion_level())
701 return false;
702 if (!sk)
703 return true;
704 switch (sk->sk_family) {
705 case AF_INET:
706 return inet_sk(sk)->mc_loop;
707#if IS_ENABLED(CONFIG_IPV6)
708 case AF_INET6:
709 return inet6_sk(sk)->mc_loop;
710#endif
711 }
712 WARN_ON(1);
713 return true;
714}
715EXPORT_SYMBOL(sk_mc_loop);
716
717/*
718 * This is meant for all protocols to use and covers goings on
719 * at the socket level. Everything here is generic.
720 */
721
722int sock_setsockopt(struct socket *sock, int level, int optname,
723 char __user *optval, unsigned int optlen)
724{
725 struct sock_txtime sk_txtime;
726 struct sock *sk = sock->sk;
727 int val;
728 int valbool;
729 struct linger ling;
730 int ret = 0;
731
732 /*
733 * Options without arguments
734 */
735
736 if (optname == SO_BINDTODEVICE)
737 return sock_setbindtodevice(sk, optval, optlen);
738
739 if (optlen < sizeof(int))
740 return -EINVAL;
741
742 if (get_user(val, (int __user *)optval))
743 return -EFAULT;
744
745 valbool = val ? 1 : 0;
746
747 lock_sock(sk);
748
749 switch (optname) {
750 case SO_DEBUG:
751 if (val && !capable(CAP_NET_ADMIN))
752 ret = -EACCES;
753 else
754 sock_valbool_flag(sk, SOCK_DBG, valbool);
755 break;
756 case SO_REUSEADDR:
757 sk->sk_reuse = (valbool ? SK_CAN_REUSE : SK_NO_REUSE);
758 break;
759 case SO_REUSEPORT:
760 sk->sk_reuseport = valbool;
761 break;
762 case SO_TYPE:
763 case SO_PROTOCOL:
764 case SO_DOMAIN:
765 case SO_ERROR:
766 ret = -ENOPROTOOPT;
767 break;
768 case SO_DONTROUTE:
769 sock_valbool_flag(sk, SOCK_LOCALROUTE, valbool);
770 sk_dst_reset(sk);
771 break;
772 case SO_BROADCAST:
773 sock_valbool_flag(sk, SOCK_BROADCAST, valbool);
774 break;
775 case SO_SNDBUF:
776 /* Don't error on this BSD doesn't and if you think
777 * about it this is right. Otherwise apps have to
778 * play 'guess the biggest size' games. RCVBUF/SNDBUF
779 * are treated in BSD as hints
780 */
781 val = min_t(u32, val, sysctl_wmem_max);
782set_sndbuf:
783 /* Ensure val * 2 fits into an int, to prevent max_t()
784 * from treating it as a negative value.
785 */
786 val = min_t(int, val, INT_MAX / 2);
787 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
788 WRITE_ONCE(sk->sk_sndbuf,
789 max_t(int, val * 2, SOCK_MIN_SNDBUF));
790 /* Wake up sending tasks if we upped the value. */
791 sk->sk_write_space(sk);
792 break;
793
794 case SO_SNDBUFFORCE:
795 if (!capable(CAP_NET_ADMIN)) {
796 ret = -EPERM;
797 break;
798 }
799
800 /* No negative values (to prevent underflow, as val will be
801 * multiplied by 2).
802 */
803 if (val < 0)
804 val = 0;
805 goto set_sndbuf;
806
807 case SO_RCVBUF:
808 /* Don't error on this BSD doesn't and if you think
809 * about it this is right. Otherwise apps have to
810 * play 'guess the biggest size' games. RCVBUF/SNDBUF
811 * are treated in BSD as hints
812 */
813 val = min_t(u32, val, sysctl_rmem_max);
814set_rcvbuf:
815 /* Ensure val * 2 fits into an int, to prevent max_t()
816 * from treating it as a negative value.
817 */
818 val = min_t(int, val, INT_MAX / 2);
819 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
820 /*
821 * We double it on the way in to account for
822 * "struct sk_buff" etc. overhead. Applications
823 * assume that the SO_RCVBUF setting they make will
824 * allow that much actual data to be received on that
825 * socket.
826 *
827 * Applications are unaware that "struct sk_buff" and
828 * other overheads allocate from the receive buffer
829 * during socket buffer allocation.
830 *
831 * And after considering the possible alternatives,
832 * returning the value we actually used in getsockopt
833 * is the most desirable behavior.
834 */
835 WRITE_ONCE(sk->sk_rcvbuf,
836 max_t(int, val * 2, SOCK_MIN_RCVBUF));
837 break;
838
839 case SO_RCVBUFFORCE:
840 if (!capable(CAP_NET_ADMIN)) {
841 ret = -EPERM;
842 break;
843 }
844
845 /* No negative values (to prevent underflow, as val will be
846 * multiplied by 2).
847 */
848 if (val < 0)
849 val = 0;
850 goto set_rcvbuf;
851
852 case SO_KEEPALIVE:
853 if (sk->sk_prot->keepalive)
854 sk->sk_prot->keepalive(sk, valbool);
855 sock_valbool_flag(sk, SOCK_KEEPOPEN, valbool);
856 break;
857
858 case SO_OOBINLINE:
859 sock_valbool_flag(sk, SOCK_URGINLINE, valbool);
860 break;
861
862 case SO_NO_CHECK:
863 sk->sk_no_check_tx = valbool;
864 break;
865
866 case SO_PRIORITY:
867 if ((val >= 0 && val <= 6) ||
868 ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
869 sk->sk_priority = val;
870 else
871 ret = -EPERM;
872 break;
873
874 case SO_LINGER:
875 if (optlen < sizeof(ling)) {
876 ret = -EINVAL; /* 1003.1g */
877 break;
878 }
879 if (copy_from_user(&ling, optval, sizeof(ling))) {
880 ret = -EFAULT;
881 break;
882 }
883 if (!ling.l_onoff)
884 sock_reset_flag(sk, SOCK_LINGER);
885 else {
886#if (BITS_PER_LONG == 32)
887 if ((unsigned int)ling.l_linger >= MAX_SCHEDULE_TIMEOUT/HZ)
888 sk->sk_lingertime = MAX_SCHEDULE_TIMEOUT;
889 else
890#endif
891 sk->sk_lingertime = (unsigned int)ling.l_linger * HZ;
892 sock_set_flag(sk, SOCK_LINGER);
893 }
894 break;
895
896 case SO_BSDCOMPAT:
897 sock_warn_obsolete_bsdism("setsockopt");
898 break;
899
900 case SO_PASSCRED:
901 if (valbool)
902 set_bit(SOCK_PASSCRED, &sock->flags);
903 else
904 clear_bit(SOCK_PASSCRED, &sock->flags);
905 break;
906
907 case SO_TIMESTAMP_OLD:
908 case SO_TIMESTAMP_NEW:
909 case SO_TIMESTAMPNS_OLD:
910 case SO_TIMESTAMPNS_NEW:
911 if (valbool) {
912 if (optname == SO_TIMESTAMP_NEW || optname == SO_TIMESTAMPNS_NEW)
913 sock_set_flag(sk, SOCK_TSTAMP_NEW);
914 else
915 sock_reset_flag(sk, SOCK_TSTAMP_NEW);
916
917 if (optname == SO_TIMESTAMP_OLD || optname == SO_TIMESTAMP_NEW)
918 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
919 else
920 sock_set_flag(sk, SOCK_RCVTSTAMPNS);
921 sock_set_flag(sk, SOCK_RCVTSTAMP);
922 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
923 } else {
924 sock_reset_flag(sk, SOCK_RCVTSTAMP);
925 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
926 sock_reset_flag(sk, SOCK_TSTAMP_NEW);
927 }
928 break;
929
930 case SO_TIMESTAMPING_NEW:
931 sock_set_flag(sk, SOCK_TSTAMP_NEW);
932 /* fall through */
933 case SO_TIMESTAMPING_OLD:
934 if (val & ~SOF_TIMESTAMPING_MASK) {
935 ret = -EINVAL;
936 break;
937 }
938
939 if (val & SOF_TIMESTAMPING_OPT_ID &&
940 !(sk->sk_tsflags & SOF_TIMESTAMPING_OPT_ID)) {
941 if (sk->sk_protocol == IPPROTO_TCP &&
942 sk->sk_type == SOCK_STREAM) {
943 if ((1 << sk->sk_state) &
944 (TCPF_CLOSE | TCPF_LISTEN)) {
945 ret = -EINVAL;
946 break;
947 }
948 sk->sk_tskey = tcp_sk(sk)->snd_una;
949 } else {
950 sk->sk_tskey = 0;
951 }
952 }
953
954 if (val & SOF_TIMESTAMPING_OPT_STATS &&
955 !(val & SOF_TIMESTAMPING_OPT_TSONLY)) {
956 ret = -EINVAL;
957 break;
958 }
959
960 sk->sk_tsflags = val;
961 if (val & SOF_TIMESTAMPING_RX_SOFTWARE)
962 sock_enable_timestamp(sk,
963 SOCK_TIMESTAMPING_RX_SOFTWARE);
964 else {
965 if (optname == SO_TIMESTAMPING_NEW)
966 sock_reset_flag(sk, SOCK_TSTAMP_NEW);
967
968 sock_disable_timestamp(sk,
969 (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE));
970 }
971 break;
972
973 case SO_RCVLOWAT:
974 if (val < 0)
975 val = INT_MAX;
976 if (sock->ops->set_rcvlowat)
977 ret = sock->ops->set_rcvlowat(sk, val);
978 else
979 WRITE_ONCE(sk->sk_rcvlowat, val ? : 1);
980 break;
981
982 case SO_RCVTIMEO_OLD:
983 case SO_RCVTIMEO_NEW:
984 ret = sock_set_timeout(&sk->sk_rcvtimeo, optval, optlen, optname == SO_RCVTIMEO_OLD);
985 break;
986
987 case SO_SNDTIMEO_OLD:
988 case SO_SNDTIMEO_NEW:
989 ret = sock_set_timeout(&sk->sk_sndtimeo, optval, optlen, optname == SO_SNDTIMEO_OLD);
990 break;
991
992 case SO_ATTACH_FILTER:
993 ret = -EINVAL;
994 if (optlen == sizeof(struct sock_fprog)) {
995 struct sock_fprog fprog;
996
997 ret = -EFAULT;
998 if (copy_from_user(&fprog, optval, sizeof(fprog)))
999 break;
1000
1001 ret = sk_attach_filter(&fprog, sk);
1002 }
1003 break;
1004
1005 case SO_ATTACH_BPF:
1006 ret = -EINVAL;
1007 if (optlen == sizeof(u32)) {
1008 u32 ufd;
1009
1010 ret = -EFAULT;
1011 if (copy_from_user(&ufd, optval, sizeof(ufd)))
1012 break;
1013
1014 ret = sk_attach_bpf(ufd, sk);
1015 }
1016 break;
1017
1018 case SO_ATTACH_REUSEPORT_CBPF:
1019 ret = -EINVAL;
1020 if (optlen == sizeof(struct sock_fprog)) {
1021 struct sock_fprog fprog;
1022
1023 ret = -EFAULT;
1024 if (copy_from_user(&fprog, optval, sizeof(fprog)))
1025 break;
1026
1027 ret = sk_reuseport_attach_filter(&fprog, sk);
1028 }
1029 break;
1030
1031 case SO_ATTACH_REUSEPORT_EBPF:
1032 ret = -EINVAL;
1033 if (optlen == sizeof(u32)) {
1034 u32 ufd;
1035
1036 ret = -EFAULT;
1037 if (copy_from_user(&ufd, optval, sizeof(ufd)))
1038 break;
1039
1040 ret = sk_reuseport_attach_bpf(ufd, sk);
1041 }
1042 break;
1043
1044 case SO_DETACH_REUSEPORT_BPF:
1045 ret = reuseport_detach_prog(sk);
1046 break;
1047
1048 case SO_DETACH_FILTER:
1049 ret = sk_detach_filter(sk);
1050 break;
1051
1052 case SO_LOCK_FILTER:
1053 if (sock_flag(sk, SOCK_FILTER_LOCKED) && !valbool)
1054 ret = -EPERM;
1055 else
1056 sock_valbool_flag(sk, SOCK_FILTER_LOCKED, valbool);
1057 break;
1058
1059 case SO_PASSSEC:
1060 if (valbool)
1061 set_bit(SOCK_PASSSEC, &sock->flags);
1062 else
1063 clear_bit(SOCK_PASSSEC, &sock->flags);
1064 break;
1065 case SO_MARK:
1066 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) {
1067 ret = -EPERM;
1068 } else if (val != sk->sk_mark) {
1069 sk->sk_mark = val;
1070 sk_dst_reset(sk);
1071 }
1072 break;
1073
1074 case SO_RXQ_OVFL:
1075 sock_valbool_flag(sk, SOCK_RXQ_OVFL, valbool);
1076 break;
1077
1078 case SO_WIFI_STATUS:
1079 sock_valbool_flag(sk, SOCK_WIFI_STATUS, valbool);
1080 break;
1081
1082 case SO_PEEK_OFF:
1083 if (sock->ops->set_peek_off)
1084 ret = sock->ops->set_peek_off(sk, val);
1085 else
1086 ret = -EOPNOTSUPP;
1087 break;
1088
1089 case SO_NOFCS:
1090 sock_valbool_flag(sk, SOCK_NOFCS, valbool);
1091 break;
1092
1093 case SO_SELECT_ERR_QUEUE:
1094 sock_valbool_flag(sk, SOCK_SELECT_ERR_QUEUE, valbool);
1095 break;
1096
1097#ifdef CONFIG_NET_RX_BUSY_POLL
1098 case SO_BUSY_POLL:
1099 /* allow unprivileged users to decrease the value */
1100 if ((val > sk->sk_ll_usec) && !capable(CAP_NET_ADMIN))
1101 ret = -EPERM;
1102 else {
1103 if (val < 0)
1104 ret = -EINVAL;
1105 else
1106 sk->sk_ll_usec = val;
1107 }
1108 break;
1109#endif
1110
1111 case SO_MAX_PACING_RATE:
1112 {
1113 unsigned long ulval = (val == ~0U) ? ~0UL : val;
1114
1115 if (sizeof(ulval) != sizeof(val) &&
1116 optlen >= sizeof(ulval) &&
1117 get_user(ulval, (unsigned long __user *)optval)) {
1118 ret = -EFAULT;
1119 break;
1120 }
1121 if (ulval != ~0UL)
1122 cmpxchg(&sk->sk_pacing_status,
1123 SK_PACING_NONE,
1124 SK_PACING_NEEDED);
1125 sk->sk_max_pacing_rate = ulval;
1126 sk->sk_pacing_rate = min(sk->sk_pacing_rate, ulval);
1127 break;
1128 }
1129 case SO_INCOMING_CPU:
1130 WRITE_ONCE(sk->sk_incoming_cpu, val);
1131 break;
1132
1133 case SO_CNX_ADVICE:
1134 if (val == 1)
1135 dst_negative_advice(sk);
1136 break;
1137
1138 case SO_ZEROCOPY:
1139 if (sk->sk_family == PF_INET || sk->sk_family == PF_INET6) {
1140 if (!((sk->sk_type == SOCK_STREAM &&
1141 sk->sk_protocol == IPPROTO_TCP) ||
1142 (sk->sk_type == SOCK_DGRAM &&
1143 sk->sk_protocol == IPPROTO_UDP)))
1144 ret = -ENOTSUPP;
1145 } else if (sk->sk_family != PF_RDS) {
1146 ret = -ENOTSUPP;
1147 }
1148 if (!ret) {
1149 if (val < 0 || val > 1)
1150 ret = -EINVAL;
1151 else
1152 sock_valbool_flag(sk, SOCK_ZEROCOPY, valbool);
1153 }
1154 break;
1155
1156 case SO_TXTIME:
1157 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) {
1158 ret = -EPERM;
1159 } else if (optlen != sizeof(struct sock_txtime)) {
1160 ret = -EINVAL;
1161 } else if (copy_from_user(&sk_txtime, optval,
1162 sizeof(struct sock_txtime))) {
1163 ret = -EFAULT;
1164 } else if (sk_txtime.flags & ~SOF_TXTIME_FLAGS_MASK) {
1165 ret = -EINVAL;
1166 } else {
1167 sock_valbool_flag(sk, SOCK_TXTIME, true);
1168 sk->sk_clockid = sk_txtime.clockid;
1169 sk->sk_txtime_deadline_mode =
1170 !!(sk_txtime.flags & SOF_TXTIME_DEADLINE_MODE);
1171 sk->sk_txtime_report_errors =
1172 !!(sk_txtime.flags & SOF_TXTIME_REPORT_ERRORS);
1173 }
1174 break;
1175
1176 case SO_BINDTOIFINDEX:
1177 ret = sock_setbindtodevice_locked(sk, val);
1178 break;
1179
1180 default:
1181 ret = -ENOPROTOOPT;
1182 break;
1183 }
1184 release_sock(sk);
1185 return ret;
1186}
1187EXPORT_SYMBOL(sock_setsockopt);
1188
1189
1190static void cred_to_ucred(struct pid *pid, const struct cred *cred,
1191 struct ucred *ucred)
1192{
1193 ucred->pid = pid_vnr(pid);
1194 ucred->uid = ucred->gid = -1;
1195 if (cred) {
1196 struct user_namespace *current_ns = current_user_ns();
1197
1198 ucred->uid = from_kuid_munged(current_ns, cred->euid);
1199 ucred->gid = from_kgid_munged(current_ns, cred->egid);
1200 }
1201}
1202
1203static int groups_to_user(gid_t __user *dst, const struct group_info *src)
1204{
1205 struct user_namespace *user_ns = current_user_ns();
1206 int i;
1207
1208 for (i = 0; i < src->ngroups; i++)
1209 if (put_user(from_kgid_munged(user_ns, src->gid[i]), dst + i))
1210 return -EFAULT;
1211
1212 return 0;
1213}
1214
1215int sock_getsockopt(struct socket *sock, int level, int optname,
1216 char __user *optval, int __user *optlen)
1217{
1218 struct sock *sk = sock->sk;
1219
1220 union {
1221 int val;
1222 u64 val64;
1223 unsigned long ulval;
1224 struct linger ling;
1225 struct old_timeval32 tm32;
1226 struct __kernel_old_timeval tm;
1227 struct __kernel_sock_timeval stm;
1228 struct sock_txtime txtime;
1229 } v;
1230
1231 int lv = sizeof(int);
1232 int len;
1233
1234 if (get_user(len, optlen))
1235 return -EFAULT;
1236 if (len < 0)
1237 return -EINVAL;
1238
1239 memset(&v, 0, sizeof(v));
1240
1241 switch (optname) {
1242 case SO_DEBUG:
1243 v.val = sock_flag(sk, SOCK_DBG);
1244 break;
1245
1246 case SO_DONTROUTE:
1247 v.val = sock_flag(sk, SOCK_LOCALROUTE);
1248 break;
1249
1250 case SO_BROADCAST:
1251 v.val = sock_flag(sk, SOCK_BROADCAST);
1252 break;
1253
1254 case SO_SNDBUF:
1255 v.val = sk->sk_sndbuf;
1256 break;
1257
1258 case SO_RCVBUF:
1259 v.val = sk->sk_rcvbuf;
1260 break;
1261
1262 case SO_REUSEADDR:
1263 v.val = sk->sk_reuse;
1264 break;
1265
1266 case SO_REUSEPORT:
1267 v.val = sk->sk_reuseport;
1268 break;
1269
1270 case SO_KEEPALIVE:
1271 v.val = sock_flag(sk, SOCK_KEEPOPEN);
1272 break;
1273
1274 case SO_TYPE:
1275 v.val = sk->sk_type;
1276 break;
1277
1278 case SO_PROTOCOL:
1279 v.val = sk->sk_protocol;
1280 break;
1281
1282 case SO_DOMAIN:
1283 v.val = sk->sk_family;
1284 break;
1285
1286 case SO_ERROR:
1287 v.val = -sock_error(sk);
1288 if (v.val == 0)
1289 v.val = xchg(&sk->sk_err_soft, 0);
1290 break;
1291
1292 case SO_OOBINLINE:
1293 v.val = sock_flag(sk, SOCK_URGINLINE);
1294 break;
1295
1296 case SO_NO_CHECK:
1297 v.val = sk->sk_no_check_tx;
1298 break;
1299
1300 case SO_PRIORITY:
1301 v.val = sk->sk_priority;
1302 break;
1303
1304 case SO_LINGER:
1305 lv = sizeof(v.ling);
1306 v.ling.l_onoff = sock_flag(sk, SOCK_LINGER);
1307 v.ling.l_linger = sk->sk_lingertime / HZ;
1308 break;
1309
1310 case SO_BSDCOMPAT:
1311 sock_warn_obsolete_bsdism("getsockopt");
1312 break;
1313
1314 case SO_TIMESTAMP_OLD:
1315 v.val = sock_flag(sk, SOCK_RCVTSTAMP) &&
1316 !sock_flag(sk, SOCK_TSTAMP_NEW) &&
1317 !sock_flag(sk, SOCK_RCVTSTAMPNS);
1318 break;
1319
1320 case SO_TIMESTAMPNS_OLD:
1321 v.val = sock_flag(sk, SOCK_RCVTSTAMPNS) && !sock_flag(sk, SOCK_TSTAMP_NEW);
1322 break;
1323
1324 case SO_TIMESTAMP_NEW:
1325 v.val = sock_flag(sk, SOCK_RCVTSTAMP) && sock_flag(sk, SOCK_TSTAMP_NEW);
1326 break;
1327
1328 case SO_TIMESTAMPNS_NEW:
1329 v.val = sock_flag(sk, SOCK_RCVTSTAMPNS) && sock_flag(sk, SOCK_TSTAMP_NEW);
1330 break;
1331
1332 case SO_TIMESTAMPING_OLD:
1333 v.val = sk->sk_tsflags;
1334 break;
1335
1336 case SO_RCVTIMEO_OLD:
1337 case SO_RCVTIMEO_NEW:
1338 lv = sock_get_timeout(sk->sk_rcvtimeo, &v, SO_RCVTIMEO_OLD == optname);
1339 break;
1340
1341 case SO_SNDTIMEO_OLD:
1342 case SO_SNDTIMEO_NEW:
1343 lv = sock_get_timeout(sk->sk_sndtimeo, &v, SO_SNDTIMEO_OLD == optname);
1344 break;
1345
1346 case SO_RCVLOWAT:
1347 v.val = sk->sk_rcvlowat;
1348 break;
1349
1350 case SO_SNDLOWAT:
1351 v.val = 1;
1352 break;
1353
1354 case SO_PASSCRED:
1355 v.val = !!test_bit(SOCK_PASSCRED, &sock->flags);
1356 break;
1357
1358 case SO_PEERCRED:
1359 {
1360 struct ucred peercred;
1361 if (len > sizeof(peercred))
1362 len = sizeof(peercred);
1363 cred_to_ucred(sk->sk_peer_pid, sk->sk_peer_cred, &peercred);
1364 if (copy_to_user(optval, &peercred, len))
1365 return -EFAULT;
1366 goto lenout;
1367 }
1368
1369 case SO_PEERGROUPS:
1370 {
1371 int ret, n;
1372
1373 if (!sk->sk_peer_cred)
1374 return -ENODATA;
1375
1376 n = sk->sk_peer_cred->group_info->ngroups;
1377 if (len < n * sizeof(gid_t)) {
1378 len = n * sizeof(gid_t);
1379 return put_user(len, optlen) ? -EFAULT : -ERANGE;
1380 }
1381 len = n * sizeof(gid_t);
1382
1383 ret = groups_to_user((gid_t __user *)optval,
1384 sk->sk_peer_cred->group_info);
1385 if (ret)
1386 return ret;
1387 goto lenout;
1388 }
1389
1390 case SO_PEERNAME:
1391 {
1392 char address[128];
1393
1394 lv = sock->ops->getname(sock, (struct sockaddr *)address, 2);
1395 if (lv < 0)
1396 return -ENOTCONN;
1397 if (lv < len)
1398 return -EINVAL;
1399 if (copy_to_user(optval, address, len))
1400 return -EFAULT;
1401 goto lenout;
1402 }
1403
1404 /* Dubious BSD thing... Probably nobody even uses it, but
1405 * the UNIX standard wants it for whatever reason... -DaveM
1406 */
1407 case SO_ACCEPTCONN:
1408 v.val = sk->sk_state == TCP_LISTEN;
1409 break;
1410
1411 case SO_PASSSEC:
1412 v.val = !!test_bit(SOCK_PASSSEC, &sock->flags);
1413 break;
1414
1415 case SO_PEERSEC:
1416 return security_socket_getpeersec_stream(sock, optval, optlen, len);
1417
1418 case SO_MARK:
1419 v.val = sk->sk_mark;
1420 break;
1421
1422 case SO_RXQ_OVFL:
1423 v.val = sock_flag(sk, SOCK_RXQ_OVFL);
1424 break;
1425
1426 case SO_WIFI_STATUS:
1427 v.val = sock_flag(sk, SOCK_WIFI_STATUS);
1428 break;
1429
1430 case SO_PEEK_OFF:
1431 if (!sock->ops->set_peek_off)
1432 return -EOPNOTSUPP;
1433
1434 v.val = sk->sk_peek_off;
1435 break;
1436 case SO_NOFCS:
1437 v.val = sock_flag(sk, SOCK_NOFCS);
1438 break;
1439
1440 case SO_BINDTODEVICE:
1441 return sock_getbindtodevice(sk, optval, optlen, len);
1442
1443 case SO_GET_FILTER:
1444 len = sk_get_filter(sk, (struct sock_filter __user *)optval, len);
1445 if (len < 0)
1446 return len;
1447
1448 goto lenout;
1449
1450 case SO_LOCK_FILTER:
1451 v.val = sock_flag(sk, SOCK_FILTER_LOCKED);
1452 break;
1453
1454 case SO_BPF_EXTENSIONS:
1455 v.val = bpf_tell_extensions();
1456 break;
1457
1458 case SO_SELECT_ERR_QUEUE:
1459 v.val = sock_flag(sk, SOCK_SELECT_ERR_QUEUE);
1460 break;
1461
1462#ifdef CONFIG_NET_RX_BUSY_POLL
1463 case SO_BUSY_POLL:
1464 v.val = sk->sk_ll_usec;
1465 break;
1466#endif
1467
1468 case SO_MAX_PACING_RATE:
1469 if (sizeof(v.ulval) != sizeof(v.val) && len >= sizeof(v.ulval)) {
1470 lv = sizeof(v.ulval);
1471 v.ulval = sk->sk_max_pacing_rate;
1472 } else {
1473 /* 32bit version */
1474 v.val = min_t(unsigned long, sk->sk_max_pacing_rate, ~0U);
1475 }
1476 break;
1477
1478 case SO_INCOMING_CPU:
1479 v.val = READ_ONCE(sk->sk_incoming_cpu);
1480 break;
1481
1482 case SO_MEMINFO:
1483 {
1484 u32 meminfo[SK_MEMINFO_VARS];
1485
1486 sk_get_meminfo(sk, meminfo);
1487
1488 len = min_t(unsigned int, len, sizeof(meminfo));
1489 if (copy_to_user(optval, &meminfo, len))
1490 return -EFAULT;
1491
1492 goto lenout;
1493 }
1494
1495#ifdef CONFIG_NET_RX_BUSY_POLL
1496 case SO_INCOMING_NAPI_ID:
1497 v.val = READ_ONCE(sk->sk_napi_id);
1498
1499 /* aggregate non-NAPI IDs down to 0 */
1500 if (v.val < MIN_NAPI_ID)
1501 v.val = 0;
1502
1503 break;
1504#endif
1505
1506 case SO_COOKIE:
1507 lv = sizeof(u64);
1508 if (len < lv)
1509 return -EINVAL;
1510 v.val64 = sock_gen_cookie(sk);
1511 break;
1512
1513 case SO_ZEROCOPY:
1514 v.val = sock_flag(sk, SOCK_ZEROCOPY);
1515 break;
1516
1517 case SO_TXTIME:
1518 lv = sizeof(v.txtime);
1519 v.txtime.clockid = sk->sk_clockid;
1520 v.txtime.flags |= sk->sk_txtime_deadline_mode ?
1521 SOF_TXTIME_DEADLINE_MODE : 0;
1522 v.txtime.flags |= sk->sk_txtime_report_errors ?
1523 SOF_TXTIME_REPORT_ERRORS : 0;
1524 break;
1525
1526 case SO_BINDTOIFINDEX:
1527 v.val = sk->sk_bound_dev_if;
1528 break;
1529
1530 default:
1531 /* We implement the SO_SNDLOWAT etc to not be settable
1532 * (1003.1g 7).
1533 */
1534 return -ENOPROTOOPT;
1535 }
1536
1537 if (len > lv)
1538 len = lv;
1539 if (copy_to_user(optval, &v, len))
1540 return -EFAULT;
1541lenout:
1542 if (put_user(len, optlen))
1543 return -EFAULT;
1544 return 0;
1545}
1546
1547/*
1548 * Initialize an sk_lock.
1549 *
1550 * (We also register the sk_lock with the lock validator.)
1551 */
1552static inline void sock_lock_init(struct sock *sk)
1553{
1554 if (sk->sk_kern_sock)
1555 sock_lock_init_class_and_name(
1556 sk,
1557 af_family_kern_slock_key_strings[sk->sk_family],
1558 af_family_kern_slock_keys + sk->sk_family,
1559 af_family_kern_key_strings[sk->sk_family],
1560 af_family_kern_keys + sk->sk_family);
1561 else
1562 sock_lock_init_class_and_name(
1563 sk,
1564 af_family_slock_key_strings[sk->sk_family],
1565 af_family_slock_keys + sk->sk_family,
1566 af_family_key_strings[sk->sk_family],
1567 af_family_keys + sk->sk_family);
1568}
1569
1570/*
1571 * Copy all fields from osk to nsk but nsk->sk_refcnt must not change yet,
1572 * even temporarly, because of RCU lookups. sk_node should also be left as is.
1573 * We must not copy fields between sk_dontcopy_begin and sk_dontcopy_end
1574 */
1575static void sock_copy(struct sock *nsk, const struct sock *osk)
1576{
1577#ifdef CONFIG_SECURITY_NETWORK
1578 void *sptr = nsk->sk_security;
1579#endif
1580 memcpy(nsk, osk, offsetof(struct sock, sk_dontcopy_begin));
1581
1582 memcpy(&nsk->sk_dontcopy_end, &osk->sk_dontcopy_end,
1583 osk->sk_prot->obj_size - offsetof(struct sock, sk_dontcopy_end));
1584
1585#ifdef CONFIG_SECURITY_NETWORK
1586 nsk->sk_security = sptr;
1587 security_sk_clone(osk, nsk);
1588#endif
1589}
1590
1591static struct sock *sk_prot_alloc(struct proto *prot, gfp_t priority,
1592 int family)
1593{
1594 struct sock *sk;
1595 struct kmem_cache *slab;
1596
1597 slab = prot->slab;
1598 if (slab != NULL) {
1599 sk = kmem_cache_alloc(slab, priority & ~__GFP_ZERO);
1600 if (!sk)
1601 return sk;
1602 if (want_init_on_alloc(priority))
1603 sk_prot_clear_nulls(sk, prot->obj_size);
1604 } else
1605 sk = kmalloc(prot->obj_size, priority);
1606
1607 if (sk != NULL) {
1608 if (security_sk_alloc(sk, family, priority))
1609 goto out_free;
1610
1611 if (!try_module_get(prot->owner))
1612 goto out_free_sec;
1613 sk_tx_queue_clear(sk);
1614 }
1615
1616 return sk;
1617
1618out_free_sec:
1619 security_sk_free(sk);
1620out_free:
1621 if (slab != NULL)
1622 kmem_cache_free(slab, sk);
1623 else
1624 kfree(sk);
1625 return NULL;
1626}
1627
1628static void sk_prot_free(struct proto *prot, struct sock *sk)
1629{
1630 struct kmem_cache *slab;
1631 struct module *owner;
1632
1633 owner = prot->owner;
1634 slab = prot->slab;
1635
1636 cgroup_sk_free(&sk->sk_cgrp_data);
1637 mem_cgroup_sk_free(sk);
1638 security_sk_free(sk);
1639 if (slab != NULL)
1640 kmem_cache_free(slab, sk);
1641 else
1642 kfree(sk);
1643 module_put(owner);
1644}
1645
1646/**
1647 * sk_alloc - All socket objects are allocated here
1648 * @net: the applicable net namespace
1649 * @family: protocol family
1650 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
1651 * @prot: struct proto associated with this new sock instance
1652 * @kern: is this to be a kernel socket?
1653 */
1654struct sock *sk_alloc(struct net *net, int family, gfp_t priority,
1655 struct proto *prot, int kern)
1656{
1657 struct sock *sk;
1658
1659 sk = sk_prot_alloc(prot, priority | __GFP_ZERO, family);
1660 if (sk) {
1661 sk->sk_family = family;
1662 /*
1663 * See comment in struct sock definition to understand
1664 * why we need sk_prot_creator -acme
1665 */
1666 sk->sk_prot = sk->sk_prot_creator = prot;
1667 sk->sk_kern_sock = kern;
1668 sock_lock_init(sk);
1669 sk->sk_net_refcnt = kern ? 0 : 1;
1670 if (likely(sk->sk_net_refcnt)) {
1671 get_net(net);
1672 sock_inuse_add(net, 1);
1673 }
1674
1675 sock_net_set(sk, net);
1676 refcount_set(&sk->sk_wmem_alloc, 1);
1677
1678 mem_cgroup_sk_alloc(sk);
1679 cgroup_sk_alloc(&sk->sk_cgrp_data);
1680 sock_update_classid(&sk->sk_cgrp_data);
1681 sock_update_netprioidx(&sk->sk_cgrp_data);
1682 }
1683
1684 return sk;
1685}
1686EXPORT_SYMBOL(sk_alloc);
1687
1688/* Sockets having SOCK_RCU_FREE will call this function after one RCU
1689 * grace period. This is the case for UDP sockets and TCP listeners.
1690 */
1691static void __sk_destruct(struct rcu_head *head)
1692{
1693 struct sock *sk = container_of(head, struct sock, sk_rcu);
1694 struct sk_filter *filter;
1695
1696 if (sk->sk_destruct)
1697 sk->sk_destruct(sk);
1698
1699 filter = rcu_dereference_check(sk->sk_filter,
1700 refcount_read(&sk->sk_wmem_alloc) == 0);
1701 if (filter) {
1702 sk_filter_uncharge(sk, filter);
1703 RCU_INIT_POINTER(sk->sk_filter, NULL);
1704 }
1705
1706 sock_disable_timestamp(sk, SK_FLAGS_TIMESTAMP);
1707
1708#ifdef CONFIG_BPF_SYSCALL
1709 bpf_sk_storage_free(sk);
1710#endif
1711
1712 if (atomic_read(&sk->sk_omem_alloc))
1713 pr_debug("%s: optmem leakage (%d bytes) detected\n",
1714 __func__, atomic_read(&sk->sk_omem_alloc));
1715
1716 if (sk->sk_frag.page) {
1717 put_page(sk->sk_frag.page);
1718 sk->sk_frag.page = NULL;
1719 }
1720
1721 if (sk->sk_peer_cred)
1722 put_cred(sk->sk_peer_cred);
1723 put_pid(sk->sk_peer_pid);
1724 if (likely(sk->sk_net_refcnt))
1725 put_net(sock_net(sk));
1726 sk_prot_free(sk->sk_prot_creator, sk);
1727}
1728
1729void sk_destruct(struct sock *sk)
1730{
1731 bool use_call_rcu = sock_flag(sk, SOCK_RCU_FREE);
1732
1733 if (rcu_access_pointer(sk->sk_reuseport_cb)) {
1734 reuseport_detach_sock(sk);
1735 use_call_rcu = true;
1736 }
1737
1738 if (use_call_rcu)
1739 call_rcu(&sk->sk_rcu, __sk_destruct);
1740 else
1741 __sk_destruct(&sk->sk_rcu);
1742}
1743
1744static void __sk_free(struct sock *sk)
1745{
1746 if (likely(sk->sk_net_refcnt))
1747 sock_inuse_add(sock_net(sk), -1);
1748
1749 if (unlikely(sk->sk_net_refcnt && sock_diag_has_destroy_listeners(sk)))
1750 sock_diag_broadcast_destroy(sk);
1751 else
1752 sk_destruct(sk);
1753}
1754
1755void sk_free(struct sock *sk)
1756{
1757 /*
1758 * We subtract one from sk_wmem_alloc and can know if
1759 * some packets are still in some tx queue.
1760 * If not null, sock_wfree() will call __sk_free(sk) later
1761 */
1762 if (refcount_dec_and_test(&sk->sk_wmem_alloc))
1763 __sk_free(sk);
1764}
1765EXPORT_SYMBOL(sk_free);
1766
1767static void sk_init_common(struct sock *sk)
1768{
1769 skb_queue_head_init(&sk->sk_receive_queue);
1770 skb_queue_head_init(&sk->sk_write_queue);
1771 skb_queue_head_init(&sk->sk_error_queue);
1772
1773 rwlock_init(&sk->sk_callback_lock);
1774 lockdep_set_class_and_name(&sk->sk_receive_queue.lock,
1775 af_rlock_keys + sk->sk_family,
1776 af_family_rlock_key_strings[sk->sk_family]);
1777 lockdep_set_class_and_name(&sk->sk_write_queue.lock,
1778 af_wlock_keys + sk->sk_family,
1779 af_family_wlock_key_strings[sk->sk_family]);
1780 lockdep_set_class_and_name(&sk->sk_error_queue.lock,
1781 af_elock_keys + sk->sk_family,
1782 af_family_elock_key_strings[sk->sk_family]);
1783 lockdep_set_class_and_name(&sk->sk_callback_lock,
1784 af_callback_keys + sk->sk_family,
1785 af_family_clock_key_strings[sk->sk_family]);
1786}
1787
1788/**
1789 * sk_clone_lock - clone a socket, and lock its clone
1790 * @sk: the socket to clone
1791 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
1792 *
1793 * Caller must unlock socket even in error path (bh_unlock_sock(newsk))
1794 */
1795struct sock *sk_clone_lock(const struct sock *sk, const gfp_t priority)
1796{
1797 struct sock *newsk;
1798 bool is_charged = true;
1799
1800 newsk = sk_prot_alloc(sk->sk_prot, priority, sk->sk_family);
1801 if (newsk != NULL) {
1802 struct sk_filter *filter;
1803
1804 sock_copy(newsk, sk);
1805
1806 newsk->sk_prot_creator = sk->sk_prot;
1807
1808 /* SANITY */
1809 if (likely(newsk->sk_net_refcnt))
1810 get_net(sock_net(newsk));
1811 sk_node_init(&newsk->sk_node);
1812 sock_lock_init(newsk);
1813 bh_lock_sock(newsk);
1814 newsk->sk_backlog.head = newsk->sk_backlog.tail = NULL;
1815 newsk->sk_backlog.len = 0;
1816
1817 atomic_set(&newsk->sk_rmem_alloc, 0);
1818 /*
1819 * sk_wmem_alloc set to one (see sk_free() and sock_wfree())
1820 */
1821 refcount_set(&newsk->sk_wmem_alloc, 1);
1822 atomic_set(&newsk->sk_omem_alloc, 0);
1823 sk_init_common(newsk);
1824
1825 newsk->sk_dst_cache = NULL;
1826 newsk->sk_dst_pending_confirm = 0;
1827 newsk->sk_wmem_queued = 0;
1828 newsk->sk_forward_alloc = 0;
1829 atomic_set(&newsk->sk_drops, 0);
1830 newsk->sk_send_head = NULL;
1831 newsk->sk_userlocks = sk->sk_userlocks & ~SOCK_BINDPORT_LOCK;
1832 atomic_set(&newsk->sk_zckey, 0);
1833
1834 sock_reset_flag(newsk, SOCK_DONE);
1835 mem_cgroup_sk_alloc(newsk);
1836 cgroup_sk_alloc(&newsk->sk_cgrp_data);
1837
1838 rcu_read_lock();
1839 filter = rcu_dereference(sk->sk_filter);
1840 if (filter != NULL)
1841 /* though it's an empty new sock, the charging may fail
1842 * if sysctl_optmem_max was changed between creation of
1843 * original socket and cloning
1844 */
1845 is_charged = sk_filter_charge(newsk, filter);
1846 RCU_INIT_POINTER(newsk->sk_filter, filter);
1847 rcu_read_unlock();
1848
1849 if (unlikely(!is_charged || xfrm_sk_clone_policy(newsk, sk))) {
1850 /* We need to make sure that we don't uncharge the new
1851 * socket if we couldn't charge it in the first place
1852 * as otherwise we uncharge the parent's filter.
1853 */
1854 if (!is_charged)
1855 RCU_INIT_POINTER(newsk->sk_filter, NULL);
1856 sk_free_unlock_clone(newsk);
1857 newsk = NULL;
1858 goto out;
1859 }
1860 RCU_INIT_POINTER(newsk->sk_reuseport_cb, NULL);
1861
1862 if (bpf_sk_storage_clone(sk, newsk)) {
1863 sk_free_unlock_clone(newsk);
1864 newsk = NULL;
1865 goto out;
1866 }
1867
1868 newsk->sk_err = 0;
1869 newsk->sk_err_soft = 0;
1870 newsk->sk_priority = 0;
1871 newsk->sk_incoming_cpu = raw_smp_processor_id();
1872 if (likely(newsk->sk_net_refcnt))
1873 sock_inuse_add(sock_net(newsk), 1);
1874
1875 /*
1876 * Before updating sk_refcnt, we must commit prior changes to memory
1877 * (Documentation/RCU/rculist_nulls.txt for details)
1878 */
1879 smp_wmb();
1880 refcount_set(&newsk->sk_refcnt, 2);
1881
1882 /*
1883 * Increment the counter in the same struct proto as the master
1884 * sock (sk_refcnt_debug_inc uses newsk->sk_prot->socks, that
1885 * is the same as sk->sk_prot->socks, as this field was copied
1886 * with memcpy).
1887 *
1888 * This _changes_ the previous behaviour, where
1889 * tcp_create_openreq_child always was incrementing the
1890 * equivalent to tcp_prot->socks (inet_sock_nr), so this have
1891 * to be taken into account in all callers. -acme
1892 */
1893 sk_refcnt_debug_inc(newsk);
1894 sk_set_socket(newsk, NULL);
1895 RCU_INIT_POINTER(newsk->sk_wq, NULL);
1896
1897 if (newsk->sk_prot->sockets_allocated)
1898 sk_sockets_allocated_inc(newsk);
1899
1900 if (sock_needs_netstamp(sk) &&
1901 newsk->sk_flags & SK_FLAGS_TIMESTAMP)
1902 net_enable_timestamp();
1903 }
1904out:
1905 return newsk;
1906}
1907EXPORT_SYMBOL_GPL(sk_clone_lock);
1908
1909void sk_free_unlock_clone(struct sock *sk)
1910{
1911 /* It is still raw copy of parent, so invalidate
1912 * destructor and make plain sk_free() */
1913 sk->sk_destruct = NULL;
1914 bh_unlock_sock(sk);
1915 sk_free(sk);
1916}
1917EXPORT_SYMBOL_GPL(sk_free_unlock_clone);
1918
1919void sk_setup_caps(struct sock *sk, struct dst_entry *dst)
1920{
1921 u32 max_segs = 1;
1922
1923 sk_dst_set(sk, dst);
1924 sk->sk_route_caps = dst->dev->features | sk->sk_route_forced_caps;
1925 if (sk->sk_route_caps & NETIF_F_GSO)
1926 sk->sk_route_caps |= NETIF_F_GSO_SOFTWARE;
1927 sk->sk_route_caps &= ~sk->sk_route_nocaps;
1928 if (sk_can_gso(sk)) {
1929 if (dst->header_len && !xfrm_dst_offload_ok(dst)) {
1930 sk->sk_route_caps &= ~NETIF_F_GSO_MASK;
1931 } else {
1932 sk->sk_route_caps |= NETIF_F_SG | NETIF_F_HW_CSUM;
1933 sk->sk_gso_max_size = dst->dev->gso_max_size;
1934 max_segs = max_t(u32, dst->dev->gso_max_segs, 1);
1935 }
1936 }
1937 sk->sk_gso_max_segs = max_segs;
1938}
1939EXPORT_SYMBOL_GPL(sk_setup_caps);
1940
1941/*
1942 * Simple resource managers for sockets.
1943 */
1944
1945
1946/*
1947 * Write buffer destructor automatically called from kfree_skb.
1948 */
1949void sock_wfree(struct sk_buff *skb)
1950{
1951 struct sock *sk = skb->sk;
1952 unsigned int len = skb->truesize;
1953
1954 if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE)) {
1955 /*
1956 * Keep a reference on sk_wmem_alloc, this will be released
1957 * after sk_write_space() call
1958 */
1959 WARN_ON(refcount_sub_and_test(len - 1, &sk->sk_wmem_alloc));
1960 sk->sk_write_space(sk);
1961 len = 1;
1962 }
1963 /*
1964 * if sk_wmem_alloc reaches 0, we must finish what sk_free()
1965 * could not do because of in-flight packets
1966 */
1967 if (refcount_sub_and_test(len, &sk->sk_wmem_alloc))
1968 __sk_free(sk);
1969}
1970EXPORT_SYMBOL(sock_wfree);
1971
1972/* This variant of sock_wfree() is used by TCP,
1973 * since it sets SOCK_USE_WRITE_QUEUE.
1974 */
1975void __sock_wfree(struct sk_buff *skb)
1976{
1977 struct sock *sk = skb->sk;
1978
1979 if (refcount_sub_and_test(skb->truesize, &sk->sk_wmem_alloc))
1980 __sk_free(sk);
1981}
1982
1983void skb_set_owner_w(struct sk_buff *skb, struct sock *sk)
1984{
1985 skb_orphan(skb);
1986 skb->sk = sk;
1987#ifdef CONFIG_INET
1988 if (unlikely(!sk_fullsock(sk))) {
1989 skb->destructor = sock_edemux;
1990 sock_hold(sk);
1991 return;
1992 }
1993#endif
1994 skb->destructor = sock_wfree;
1995 skb_set_hash_from_sk(skb, sk);
1996 /*
1997 * We used to take a refcount on sk, but following operation
1998 * is enough to guarantee sk_free() wont free this sock until
1999 * all in-flight packets are completed
2000 */
2001 refcount_add(skb->truesize, &sk->sk_wmem_alloc);
2002}
2003EXPORT_SYMBOL(skb_set_owner_w);
2004
2005static bool can_skb_orphan_partial(const struct sk_buff *skb)
2006{
2007#ifdef CONFIG_TLS_DEVICE
2008 /* Drivers depend on in-order delivery for crypto offload,
2009 * partial orphan breaks out-of-order-OK logic.
2010 */
2011 if (skb->decrypted)
2012 return false;
2013#endif
2014 return (skb->destructor == sock_wfree ||
2015 (IS_ENABLED(CONFIG_INET) && skb->destructor == tcp_wfree));
2016}
2017
2018/* This helper is used by netem, as it can hold packets in its
2019 * delay queue. We want to allow the owner socket to send more
2020 * packets, as if they were already TX completed by a typical driver.
2021 * But we also want to keep skb->sk set because some packet schedulers
2022 * rely on it (sch_fq for example).
2023 */
2024void skb_orphan_partial(struct sk_buff *skb)
2025{
2026 if (skb_is_tcp_pure_ack(skb))
2027 return;
2028
2029 if (can_skb_orphan_partial(skb)) {
2030 struct sock *sk = skb->sk;
2031
2032 if (refcount_inc_not_zero(&sk->sk_refcnt)) {
2033 WARN_ON(refcount_sub_and_test(skb->truesize, &sk->sk_wmem_alloc));
2034 skb->destructor = sock_efree;
2035 }
2036 } else {
2037 skb_orphan(skb);
2038 }
2039}
2040EXPORT_SYMBOL(skb_orphan_partial);
2041
2042/*
2043 * Read buffer destructor automatically called from kfree_skb.
2044 */
2045void sock_rfree(struct sk_buff *skb)
2046{
2047 struct sock *sk = skb->sk;
2048 unsigned int len = skb->truesize;
2049
2050 atomic_sub(len, &sk->sk_rmem_alloc);
2051 sk_mem_uncharge(sk, len);
2052}
2053EXPORT_SYMBOL(sock_rfree);
2054
2055/*
2056 * Buffer destructor for skbs that are not used directly in read or write
2057 * path, e.g. for error handler skbs. Automatically called from kfree_skb.
2058 */
2059void sock_efree(struct sk_buff *skb)
2060{
2061 sock_put(skb->sk);
2062}
2063EXPORT_SYMBOL(sock_efree);
2064
2065kuid_t sock_i_uid(struct sock *sk)
2066{
2067 kuid_t uid;
2068
2069 read_lock_bh(&sk->sk_callback_lock);
2070 uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : GLOBAL_ROOT_UID;
2071 read_unlock_bh(&sk->sk_callback_lock);
2072 return uid;
2073}
2074EXPORT_SYMBOL(sock_i_uid);
2075
2076unsigned long sock_i_ino(struct sock *sk)
2077{
2078 unsigned long ino;
2079
2080 read_lock_bh(&sk->sk_callback_lock);
2081 ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0;
2082 read_unlock_bh(&sk->sk_callback_lock);
2083 return ino;
2084}
2085EXPORT_SYMBOL(sock_i_ino);
2086
2087/*
2088 * Allocate a skb from the socket's send buffer.
2089 */
2090struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force,
2091 gfp_t priority)
2092{
2093 if (force ||
2094 refcount_read(&sk->sk_wmem_alloc) < READ_ONCE(sk->sk_sndbuf)) {
2095 struct sk_buff *skb = alloc_skb(size, priority);
2096
2097 if (skb) {
2098 skb_set_owner_w(skb, sk);
2099 return skb;
2100 }
2101 }
2102 return NULL;
2103}
2104EXPORT_SYMBOL(sock_wmalloc);
2105
2106static void sock_ofree(struct sk_buff *skb)
2107{
2108 struct sock *sk = skb->sk;
2109
2110 atomic_sub(skb->truesize, &sk->sk_omem_alloc);
2111}
2112
2113struct sk_buff *sock_omalloc(struct sock *sk, unsigned long size,
2114 gfp_t priority)
2115{
2116 struct sk_buff *skb;
2117
2118 /* small safe race: SKB_TRUESIZE may differ from final skb->truesize */
2119 if (atomic_read(&sk->sk_omem_alloc) + SKB_TRUESIZE(size) >
2120 sysctl_optmem_max)
2121 return NULL;
2122
2123 skb = alloc_skb(size, priority);
2124 if (!skb)
2125 return NULL;
2126
2127 atomic_add(skb->truesize, &sk->sk_omem_alloc);
2128 skb->sk = sk;
2129 skb->destructor = sock_ofree;
2130 return skb;
2131}
2132
2133/*
2134 * Allocate a memory block from the socket's option memory buffer.
2135 */
2136void *sock_kmalloc(struct sock *sk, int size, gfp_t priority)
2137{
2138 if ((unsigned int)size <= sysctl_optmem_max &&
2139 atomic_read(&sk->sk_omem_alloc) + size < sysctl_optmem_max) {
2140 void *mem;
2141 /* First do the add, to avoid the race if kmalloc
2142 * might sleep.
2143 */
2144 atomic_add(size, &sk->sk_omem_alloc);
2145 mem = kmalloc(size, priority);
2146 if (mem)
2147 return mem;
2148 atomic_sub(size, &sk->sk_omem_alloc);
2149 }
2150 return NULL;
2151}
2152EXPORT_SYMBOL(sock_kmalloc);
2153
2154/* Free an option memory block. Note, we actually want the inline
2155 * here as this allows gcc to detect the nullify and fold away the
2156 * condition entirely.
2157 */
2158static inline void __sock_kfree_s(struct sock *sk, void *mem, int size,
2159 const bool nullify)
2160{
2161 if (WARN_ON_ONCE(!mem))
2162 return;
2163 if (nullify)
2164 kzfree(mem);
2165 else
2166 kfree(mem);
2167 atomic_sub(size, &sk->sk_omem_alloc);
2168}
2169
2170void sock_kfree_s(struct sock *sk, void *mem, int size)
2171{
2172 __sock_kfree_s(sk, mem, size, false);
2173}
2174EXPORT_SYMBOL(sock_kfree_s);
2175
2176void sock_kzfree_s(struct sock *sk, void *mem, int size)
2177{
2178 __sock_kfree_s(sk, mem, size, true);
2179}
2180EXPORT_SYMBOL(sock_kzfree_s);
2181
2182/* It is almost wait_for_tcp_memory minus release_sock/lock_sock.
2183 I think, these locks should be removed for datagram sockets.
2184 */
2185static long sock_wait_for_wmem(struct sock *sk, long timeo)
2186{
2187 DEFINE_WAIT(wait);
2188
2189 sk_clear_bit(SOCKWQ_ASYNC_NOSPACE, sk);
2190 for (;;) {
2191 if (!timeo)
2192 break;
2193 if (signal_pending(current))
2194 break;
2195 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
2196 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
2197 if (refcount_read(&sk->sk_wmem_alloc) < READ_ONCE(sk->sk_sndbuf))
2198 break;
2199 if (sk->sk_shutdown & SEND_SHUTDOWN)
2200 break;
2201 if (sk->sk_err)
2202 break;
2203 timeo = schedule_timeout(timeo);
2204 }
2205 finish_wait(sk_sleep(sk), &wait);
2206 return timeo;
2207}
2208
2209
2210/*
2211 * Generic send/receive buffer handlers
2212 */
2213
2214struct sk_buff *sock_alloc_send_pskb(struct sock *sk, unsigned long header_len,
2215 unsigned long data_len, int noblock,
2216 int *errcode, int max_page_order)
2217{
2218 struct sk_buff *skb;
2219 long timeo;
2220 int err;
2221
2222 timeo = sock_sndtimeo(sk, noblock);
2223 for (;;) {
2224 err = sock_error(sk);
2225 if (err != 0)
2226 goto failure;
2227
2228 err = -EPIPE;
2229 if (sk->sk_shutdown & SEND_SHUTDOWN)
2230 goto failure;
2231
2232 if (sk_wmem_alloc_get(sk) < READ_ONCE(sk->sk_sndbuf))
2233 break;
2234
2235 sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk);
2236 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
2237 err = -EAGAIN;
2238 if (!timeo)
2239 goto failure;
2240 if (signal_pending(current))
2241 goto interrupted;
2242 timeo = sock_wait_for_wmem(sk, timeo);
2243 }
2244 skb = alloc_skb_with_frags(header_len, data_len, max_page_order,
2245 errcode, sk->sk_allocation);
2246 if (skb)
2247 skb_set_owner_w(skb, sk);
2248 return skb;
2249
2250interrupted:
2251 err = sock_intr_errno(timeo);
2252failure:
2253 *errcode = err;
2254 return NULL;
2255}
2256EXPORT_SYMBOL(sock_alloc_send_pskb);
2257
2258struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size,
2259 int noblock, int *errcode)
2260{
2261 return sock_alloc_send_pskb(sk, size, 0, noblock, errcode, 0);
2262}
2263EXPORT_SYMBOL(sock_alloc_send_skb);
2264
2265int __sock_cmsg_send(struct sock *sk, struct msghdr *msg, struct cmsghdr *cmsg,
2266 struct sockcm_cookie *sockc)
2267{
2268 u32 tsflags;
2269
2270 switch (cmsg->cmsg_type) {
2271 case SO_MARK:
2272 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
2273 return -EPERM;
2274 if (cmsg->cmsg_len != CMSG_LEN(sizeof(u32)))
2275 return -EINVAL;
2276 sockc->mark = *(u32 *)CMSG_DATA(cmsg);
2277 break;
2278 case SO_TIMESTAMPING_OLD:
2279 if (cmsg->cmsg_len != CMSG_LEN(sizeof(u32)))
2280 return -EINVAL;
2281
2282 tsflags = *(u32 *)CMSG_DATA(cmsg);
2283 if (tsflags & ~SOF_TIMESTAMPING_TX_RECORD_MASK)
2284 return -EINVAL;
2285
2286 sockc->tsflags &= ~SOF_TIMESTAMPING_TX_RECORD_MASK;
2287 sockc->tsflags |= tsflags;
2288 break;
2289 case SCM_TXTIME:
2290 if (!sock_flag(sk, SOCK_TXTIME))
2291 return -EINVAL;
2292 if (cmsg->cmsg_len != CMSG_LEN(sizeof(u64)))
2293 return -EINVAL;
2294 sockc->transmit_time = get_unaligned((u64 *)CMSG_DATA(cmsg));
2295 break;
2296 /* SCM_RIGHTS and SCM_CREDENTIALS are semantically in SOL_UNIX. */
2297 case SCM_RIGHTS:
2298 case SCM_CREDENTIALS:
2299 break;
2300 default:
2301 return -EINVAL;
2302 }
2303 return 0;
2304}
2305EXPORT_SYMBOL(__sock_cmsg_send);
2306
2307int sock_cmsg_send(struct sock *sk, struct msghdr *msg,
2308 struct sockcm_cookie *sockc)
2309{
2310 struct cmsghdr *cmsg;
2311 int ret;
2312
2313 for_each_cmsghdr(cmsg, msg) {
2314 if (!CMSG_OK(msg, cmsg))
2315 return -EINVAL;
2316 if (cmsg->cmsg_level != SOL_SOCKET)
2317 continue;
2318 ret = __sock_cmsg_send(sk, msg, cmsg, sockc);
2319 if (ret)
2320 return ret;
2321 }
2322 return 0;
2323}
2324EXPORT_SYMBOL(sock_cmsg_send);
2325
2326static void sk_enter_memory_pressure(struct sock *sk)
2327{
2328 if (!sk->sk_prot->enter_memory_pressure)
2329 return;
2330
2331 sk->sk_prot->enter_memory_pressure(sk);
2332}
2333
2334static void sk_leave_memory_pressure(struct sock *sk)
2335{
2336 if (sk->sk_prot->leave_memory_pressure) {
2337 sk->sk_prot->leave_memory_pressure(sk);
2338 } else {
2339 unsigned long *memory_pressure = sk->sk_prot->memory_pressure;
2340
2341 if (memory_pressure && READ_ONCE(*memory_pressure))
2342 WRITE_ONCE(*memory_pressure, 0);
2343 }
2344}
2345
2346/* On 32bit arches, an skb frag is limited to 2^15 */
2347#define SKB_FRAG_PAGE_ORDER get_order(32768)
2348DEFINE_STATIC_KEY_FALSE(net_high_order_alloc_disable_key);
2349
2350/**
2351 * skb_page_frag_refill - check that a page_frag contains enough room
2352 * @sz: minimum size of the fragment we want to get
2353 * @pfrag: pointer to page_frag
2354 * @gfp: priority for memory allocation
2355 *
2356 * Note: While this allocator tries to use high order pages, there is
2357 * no guarantee that allocations succeed. Therefore, @sz MUST be
2358 * less or equal than PAGE_SIZE.
2359 */
2360bool skb_page_frag_refill(unsigned int sz, struct page_frag *pfrag, gfp_t gfp)
2361{
2362 if (pfrag->page) {
2363 if (page_ref_count(pfrag->page) == 1) {
2364 pfrag->offset = 0;
2365 return true;
2366 }
2367 if (pfrag->offset + sz <= pfrag->size)
2368 return true;
2369 put_page(pfrag->page);
2370 }
2371
2372 pfrag->offset = 0;
2373 if (SKB_FRAG_PAGE_ORDER &&
2374 !static_branch_unlikely(&net_high_order_alloc_disable_key)) {
2375 /* Avoid direct reclaim but allow kswapd to wake */
2376 pfrag->page = alloc_pages((gfp & ~__GFP_DIRECT_RECLAIM) |
2377 __GFP_COMP | __GFP_NOWARN |
2378 __GFP_NORETRY,
2379 SKB_FRAG_PAGE_ORDER);
2380 if (likely(pfrag->page)) {
2381 pfrag->size = PAGE_SIZE << SKB_FRAG_PAGE_ORDER;
2382 return true;
2383 }
2384 }
2385 pfrag->page = alloc_page(gfp);
2386 if (likely(pfrag->page)) {
2387 pfrag->size = PAGE_SIZE;
2388 return true;
2389 }
2390 return false;
2391}
2392EXPORT_SYMBOL(skb_page_frag_refill);
2393
2394bool sk_page_frag_refill(struct sock *sk, struct page_frag *pfrag)
2395{
2396 if (likely(skb_page_frag_refill(32U, pfrag, sk->sk_allocation)))
2397 return true;
2398
2399 sk_enter_memory_pressure(sk);
2400 sk_stream_moderate_sndbuf(sk);
2401 return false;
2402}
2403EXPORT_SYMBOL(sk_page_frag_refill);
2404
2405static void __lock_sock(struct sock *sk)
2406 __releases(&sk->sk_lock.slock)
2407 __acquires(&sk->sk_lock.slock)
2408{
2409 DEFINE_WAIT(wait);
2410
2411 for (;;) {
2412 prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait,
2413 TASK_UNINTERRUPTIBLE);
2414 spin_unlock_bh(&sk->sk_lock.slock);
2415 schedule();
2416 spin_lock_bh(&sk->sk_lock.slock);
2417 if (!sock_owned_by_user(sk))
2418 break;
2419 }
2420 finish_wait(&sk->sk_lock.wq, &wait);
2421}
2422
2423void __release_sock(struct sock *sk)
2424 __releases(&sk->sk_lock.slock)
2425 __acquires(&sk->sk_lock.slock)
2426{
2427 struct sk_buff *skb, *next;
2428
2429 while ((skb = sk->sk_backlog.head) != NULL) {
2430 sk->sk_backlog.head = sk->sk_backlog.tail = NULL;
2431
2432 spin_unlock_bh(&sk->sk_lock.slock);
2433
2434 do {
2435 next = skb->next;
2436 prefetch(next);
2437 WARN_ON_ONCE(skb_dst_is_noref(skb));
2438 skb_mark_not_on_list(skb);
2439 sk_backlog_rcv(sk, skb);
2440
2441 cond_resched();
2442
2443 skb = next;
2444 } while (skb != NULL);
2445
2446 spin_lock_bh(&sk->sk_lock.slock);
2447 }
2448
2449 /*
2450 * Doing the zeroing here guarantee we can not loop forever
2451 * while a wild producer attempts to flood us.
2452 */
2453 sk->sk_backlog.len = 0;
2454}
2455
2456void __sk_flush_backlog(struct sock *sk)
2457{
2458 spin_lock_bh(&sk->sk_lock.slock);
2459 __release_sock(sk);
2460 spin_unlock_bh(&sk->sk_lock.slock);
2461}
2462
2463/**
2464 * sk_wait_data - wait for data to arrive at sk_receive_queue
2465 * @sk: sock to wait on
2466 * @timeo: for how long
2467 * @skb: last skb seen on sk_receive_queue
2468 *
2469 * Now socket state including sk->sk_err is changed only under lock,
2470 * hence we may omit checks after joining wait queue.
2471 * We check receive queue before schedule() only as optimization;
2472 * it is very likely that release_sock() added new data.
2473 */
2474int sk_wait_data(struct sock *sk, long *timeo, const struct sk_buff *skb)
2475{
2476 DEFINE_WAIT_FUNC(wait, woken_wake_function);
2477 int rc;
2478
2479 add_wait_queue(sk_sleep(sk), &wait);
2480 sk_set_bit(SOCKWQ_ASYNC_WAITDATA, sk);
2481 rc = sk_wait_event(sk, timeo, skb_peek_tail(&sk->sk_receive_queue) != skb, &wait);
2482 sk_clear_bit(SOCKWQ_ASYNC_WAITDATA, sk);
2483 remove_wait_queue(sk_sleep(sk), &wait);
2484 return rc;
2485}
2486EXPORT_SYMBOL(sk_wait_data);
2487
2488/**
2489 * __sk_mem_raise_allocated - increase memory_allocated
2490 * @sk: socket
2491 * @size: memory size to allocate
2492 * @amt: pages to allocate
2493 * @kind: allocation type
2494 *
2495 * Similar to __sk_mem_schedule(), but does not update sk_forward_alloc
2496 */
2497int __sk_mem_raise_allocated(struct sock *sk, int size, int amt, int kind)
2498{
2499 struct proto *prot = sk->sk_prot;
2500 long allocated = sk_memory_allocated_add(sk, amt);
2501 bool charged = true;
2502
2503 if (mem_cgroup_sockets_enabled && sk->sk_memcg &&
2504 !(charged = mem_cgroup_charge_skmem(sk->sk_memcg, amt)))
2505 goto suppress_allocation;
2506
2507 /* Under limit. */
2508 if (allocated <= sk_prot_mem_limits(sk, 0)) {
2509 sk_leave_memory_pressure(sk);
2510 return 1;
2511 }
2512
2513 /* Under pressure. */
2514 if (allocated > sk_prot_mem_limits(sk, 1))
2515 sk_enter_memory_pressure(sk);
2516
2517 /* Over hard limit. */
2518 if (allocated > sk_prot_mem_limits(sk, 2))
2519 goto suppress_allocation;
2520
2521 /* guarantee minimum buffer size under pressure */
2522 if (kind == SK_MEM_RECV) {
2523 if (atomic_read(&sk->sk_rmem_alloc) < sk_get_rmem0(sk, prot))
2524 return 1;
2525
2526 } else { /* SK_MEM_SEND */
2527 int wmem0 = sk_get_wmem0(sk, prot);
2528
2529 if (sk->sk_type == SOCK_STREAM) {
2530 if (sk->sk_wmem_queued < wmem0)
2531 return 1;
2532 } else if (refcount_read(&sk->sk_wmem_alloc) < wmem0) {
2533 return 1;
2534 }
2535 }
2536
2537 if (sk_has_memory_pressure(sk)) {
2538 u64 alloc;
2539
2540 if (!sk_under_memory_pressure(sk))
2541 return 1;
2542 alloc = sk_sockets_allocated_read_positive(sk);
2543 if (sk_prot_mem_limits(sk, 2) > alloc *
2544 sk_mem_pages(sk->sk_wmem_queued +
2545 atomic_read(&sk->sk_rmem_alloc) +
2546 sk->sk_forward_alloc))
2547 return 1;
2548 }
2549
2550suppress_allocation:
2551
2552 if (kind == SK_MEM_SEND && sk->sk_type == SOCK_STREAM) {
2553 sk_stream_moderate_sndbuf(sk);
2554
2555 /* Fail only if socket is _under_ its sndbuf.
2556 * In this case we cannot block, so that we have to fail.
2557 */
2558 if (sk->sk_wmem_queued + size >= sk->sk_sndbuf)
2559 return 1;
2560 }
2561
2562 if (kind == SK_MEM_SEND || (kind == SK_MEM_RECV && charged))
2563 trace_sock_exceed_buf_limit(sk, prot, allocated, kind);
2564
2565 sk_memory_allocated_sub(sk, amt);
2566
2567 if (mem_cgroup_sockets_enabled && sk->sk_memcg)
2568 mem_cgroup_uncharge_skmem(sk->sk_memcg, amt);
2569
2570 return 0;
2571}
2572EXPORT_SYMBOL(__sk_mem_raise_allocated);
2573
2574/**
2575 * __sk_mem_schedule - increase sk_forward_alloc and memory_allocated
2576 * @sk: socket
2577 * @size: memory size to allocate
2578 * @kind: allocation type
2579 *
2580 * If kind is SK_MEM_SEND, it means wmem allocation. Otherwise it means
2581 * rmem allocation. This function assumes that protocols which have
2582 * memory_pressure use sk_wmem_queued as write buffer accounting.
2583 */
2584int __sk_mem_schedule(struct sock *sk, int size, int kind)
2585{
2586 int ret, amt = sk_mem_pages(size);
2587
2588 sk->sk_forward_alloc += amt << SK_MEM_QUANTUM_SHIFT;
2589 ret = __sk_mem_raise_allocated(sk, size, amt, kind);
2590 if (!ret)
2591 sk->sk_forward_alloc -= amt << SK_MEM_QUANTUM_SHIFT;
2592 return ret;
2593}
2594EXPORT_SYMBOL(__sk_mem_schedule);
2595
2596/**
2597 * __sk_mem_reduce_allocated - reclaim memory_allocated
2598 * @sk: socket
2599 * @amount: number of quanta
2600 *
2601 * Similar to __sk_mem_reclaim(), but does not update sk_forward_alloc
2602 */
2603void __sk_mem_reduce_allocated(struct sock *sk, int amount)
2604{
2605 sk_memory_allocated_sub(sk, amount);
2606
2607 if (mem_cgroup_sockets_enabled && sk->sk_memcg)
2608 mem_cgroup_uncharge_skmem(sk->sk_memcg, amount);
2609
2610 if (sk_under_memory_pressure(sk) &&
2611 (sk_memory_allocated(sk) < sk_prot_mem_limits(sk, 0)))
2612 sk_leave_memory_pressure(sk);
2613}
2614EXPORT_SYMBOL(__sk_mem_reduce_allocated);
2615
2616/**
2617 * __sk_mem_reclaim - reclaim sk_forward_alloc and memory_allocated
2618 * @sk: socket
2619 * @amount: number of bytes (rounded down to a SK_MEM_QUANTUM multiple)
2620 */
2621void __sk_mem_reclaim(struct sock *sk, int amount)
2622{
2623 amount >>= SK_MEM_QUANTUM_SHIFT;
2624 sk->sk_forward_alloc -= amount << SK_MEM_QUANTUM_SHIFT;
2625 __sk_mem_reduce_allocated(sk, amount);
2626}
2627EXPORT_SYMBOL(__sk_mem_reclaim);
2628
2629int sk_set_peek_off(struct sock *sk, int val)
2630{
2631 sk->sk_peek_off = val;
2632 return 0;
2633}
2634EXPORT_SYMBOL_GPL(sk_set_peek_off);
2635
2636/*
2637 * Set of default routines for initialising struct proto_ops when
2638 * the protocol does not support a particular function. In certain
2639 * cases where it makes no sense for a protocol to have a "do nothing"
2640 * function, some default processing is provided.
2641 */
2642
2643int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len)
2644{
2645 return -EOPNOTSUPP;
2646}
2647EXPORT_SYMBOL(sock_no_bind);
2648
2649int sock_no_connect(struct socket *sock, struct sockaddr *saddr,
2650 int len, int flags)
2651{
2652 return -EOPNOTSUPP;
2653}
2654EXPORT_SYMBOL(sock_no_connect);
2655
2656int sock_no_socketpair(struct socket *sock1, struct socket *sock2)
2657{
2658 return -EOPNOTSUPP;
2659}
2660EXPORT_SYMBOL(sock_no_socketpair);
2661
2662int sock_no_accept(struct socket *sock, struct socket *newsock, int flags,
2663 bool kern)
2664{
2665 return -EOPNOTSUPP;
2666}
2667EXPORT_SYMBOL(sock_no_accept);
2668
2669int sock_no_getname(struct socket *sock, struct sockaddr *saddr,
2670 int peer)
2671{
2672 return -EOPNOTSUPP;
2673}
2674EXPORT_SYMBOL(sock_no_getname);
2675
2676int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
2677{
2678 return -EOPNOTSUPP;
2679}
2680EXPORT_SYMBOL(sock_no_ioctl);
2681
2682int sock_no_listen(struct socket *sock, int backlog)
2683{
2684 return -EOPNOTSUPP;
2685}
2686EXPORT_SYMBOL(sock_no_listen);
2687
2688int sock_no_shutdown(struct socket *sock, int how)
2689{
2690 return -EOPNOTSUPP;
2691}
2692EXPORT_SYMBOL(sock_no_shutdown);
2693
2694int sock_no_setsockopt(struct socket *sock, int level, int optname,
2695 char __user *optval, unsigned int optlen)
2696{
2697 return -EOPNOTSUPP;
2698}
2699EXPORT_SYMBOL(sock_no_setsockopt);
2700
2701int sock_no_getsockopt(struct socket *sock, int level, int optname,
2702 char __user *optval, int __user *optlen)
2703{
2704 return -EOPNOTSUPP;
2705}
2706EXPORT_SYMBOL(sock_no_getsockopt);
2707
2708int sock_no_sendmsg(struct socket *sock, struct msghdr *m, size_t len)
2709{
2710 return -EOPNOTSUPP;
2711}
2712EXPORT_SYMBOL(sock_no_sendmsg);
2713
2714int sock_no_sendmsg_locked(struct sock *sk, struct msghdr *m, size_t len)
2715{
2716 return -EOPNOTSUPP;
2717}
2718EXPORT_SYMBOL(sock_no_sendmsg_locked);
2719
2720int sock_no_recvmsg(struct socket *sock, struct msghdr *m, size_t len,
2721 int flags)
2722{
2723 return -EOPNOTSUPP;
2724}
2725EXPORT_SYMBOL(sock_no_recvmsg);
2726
2727int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma)
2728{
2729 /* Mirror missing mmap method error code */
2730 return -ENODEV;
2731}
2732EXPORT_SYMBOL(sock_no_mmap);
2733
2734ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags)
2735{
2736 ssize_t res;
2737 struct msghdr msg = {.msg_flags = flags};
2738 struct kvec iov;
2739 char *kaddr = kmap(page);
2740 iov.iov_base = kaddr + offset;
2741 iov.iov_len = size;
2742 res = kernel_sendmsg(sock, &msg, &iov, 1, size);
2743 kunmap(page);
2744 return res;
2745}
2746EXPORT_SYMBOL(sock_no_sendpage);
2747
2748ssize_t sock_no_sendpage_locked(struct sock *sk, struct page *page,
2749 int offset, size_t size, int flags)
2750{
2751 ssize_t res;
2752 struct msghdr msg = {.msg_flags = flags};
2753 struct kvec iov;
2754 char *kaddr = kmap(page);
2755
2756 iov.iov_base = kaddr + offset;
2757 iov.iov_len = size;
2758 res = kernel_sendmsg_locked(sk, &msg, &iov, 1, size);
2759 kunmap(page);
2760 return res;
2761}
2762EXPORT_SYMBOL(sock_no_sendpage_locked);
2763
2764/*
2765 * Default Socket Callbacks
2766 */
2767
2768static void sock_def_wakeup(struct sock *sk)
2769{
2770 struct socket_wq *wq;
2771
2772 rcu_read_lock();
2773 wq = rcu_dereference(sk->sk_wq);
2774 if (skwq_has_sleeper(wq))
2775 wake_up_interruptible_all(&wq->wait);
2776 rcu_read_unlock();
2777}
2778
2779static void sock_def_error_report(struct sock *sk)
2780{
2781 struct socket_wq *wq;
2782
2783 rcu_read_lock();
2784 wq = rcu_dereference(sk->sk_wq);
2785 if (skwq_has_sleeper(wq))
2786 wake_up_interruptible_poll(&wq->wait, EPOLLERR);
2787 sk_wake_async(sk, SOCK_WAKE_IO, POLL_ERR);
2788 rcu_read_unlock();
2789}
2790
2791static void sock_def_readable(struct sock *sk)
2792{
2793 struct socket_wq *wq;
2794
2795 rcu_read_lock();
2796 wq = rcu_dereference(sk->sk_wq);
2797 if (skwq_has_sleeper(wq))
2798 wake_up_interruptible_sync_poll(&wq->wait, EPOLLIN | EPOLLPRI |
2799 EPOLLRDNORM | EPOLLRDBAND);
2800 sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN);
2801 rcu_read_unlock();
2802}
2803
2804static void sock_def_write_space(struct sock *sk)
2805{
2806 struct socket_wq *wq;
2807
2808 rcu_read_lock();
2809
2810 /* Do not wake up a writer until he can make "significant"
2811 * progress. --DaveM
2812 */
2813 if ((refcount_read(&sk->sk_wmem_alloc) << 1) <= READ_ONCE(sk->sk_sndbuf)) {
2814 wq = rcu_dereference(sk->sk_wq);
2815 if (skwq_has_sleeper(wq))
2816 wake_up_interruptible_sync_poll(&wq->wait, EPOLLOUT |
2817 EPOLLWRNORM | EPOLLWRBAND);
2818
2819 /* Should agree with poll, otherwise some programs break */
2820 if (sock_writeable(sk))
2821 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
2822 }
2823
2824 rcu_read_unlock();
2825}
2826
2827static void sock_def_destruct(struct sock *sk)
2828{
2829}
2830
2831void sk_send_sigurg(struct sock *sk)
2832{
2833 if (sk->sk_socket && sk->sk_socket->file)
2834 if (send_sigurg(&sk->sk_socket->file->f_owner))
2835 sk_wake_async(sk, SOCK_WAKE_URG, POLL_PRI);
2836}
2837EXPORT_SYMBOL(sk_send_sigurg);
2838
2839void sk_reset_timer(struct sock *sk, struct timer_list* timer,
2840 unsigned long expires)
2841{
2842 if (!mod_timer(timer, expires))
2843 sock_hold(sk);
2844}
2845EXPORT_SYMBOL(sk_reset_timer);
2846
2847void sk_stop_timer(struct sock *sk, struct timer_list* timer)
2848{
2849 if (del_timer(timer))
2850 __sock_put(sk);
2851}
2852EXPORT_SYMBOL(sk_stop_timer);
2853
2854void sock_init_data(struct socket *sock, struct sock *sk)
2855{
2856 sk_init_common(sk);
2857 sk->sk_send_head = NULL;
2858
2859 timer_setup(&sk->sk_timer, NULL, 0);
2860
2861 sk->sk_allocation = GFP_KERNEL;
2862 sk->sk_rcvbuf = sysctl_rmem_default;
2863 sk->sk_sndbuf = sysctl_wmem_default;
2864 sk->sk_state = TCP_CLOSE;
2865 sk_set_socket(sk, sock);
2866
2867 sock_set_flag(sk, SOCK_ZAPPED);
2868
2869 if (sock) {
2870 sk->sk_type = sock->type;
2871 RCU_INIT_POINTER(sk->sk_wq, &sock->wq);
2872 sock->sk = sk;
2873 sk->sk_uid = SOCK_INODE(sock)->i_uid;
2874 } else {
2875 RCU_INIT_POINTER(sk->sk_wq, NULL);
2876 sk->sk_uid = make_kuid(sock_net(sk)->user_ns, 0);
2877 }
2878
2879 rwlock_init(&sk->sk_callback_lock);
2880 if (sk->sk_kern_sock)
2881 lockdep_set_class_and_name(
2882 &sk->sk_callback_lock,
2883 af_kern_callback_keys + sk->sk_family,
2884 af_family_kern_clock_key_strings[sk->sk_family]);
2885 else
2886 lockdep_set_class_and_name(
2887 &sk->sk_callback_lock,
2888 af_callback_keys + sk->sk_family,
2889 af_family_clock_key_strings[sk->sk_family]);
2890
2891 sk->sk_state_change = sock_def_wakeup;
2892 sk->sk_data_ready = sock_def_readable;
2893 sk->sk_write_space = sock_def_write_space;
2894 sk->sk_error_report = sock_def_error_report;
2895 sk->sk_destruct = sock_def_destruct;
2896
2897 sk->sk_frag.page = NULL;
2898 sk->sk_frag.offset = 0;
2899 sk->sk_peek_off = -1;
2900
2901 sk->sk_peer_pid = NULL;
2902 sk->sk_peer_cred = NULL;
2903 sk->sk_write_pending = 0;
2904 sk->sk_rcvlowat = 1;
2905 sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT;
2906 sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT;
2907
2908 sk->sk_stamp = SK_DEFAULT_STAMP;
2909#if BITS_PER_LONG==32
2910 seqlock_init(&sk->sk_stamp_seq);
2911#endif
2912 atomic_set(&sk->sk_zckey, 0);
2913
2914#ifdef CONFIG_NET_RX_BUSY_POLL
2915 sk->sk_napi_id = 0;
2916 sk->sk_ll_usec = sysctl_net_busy_read;
2917#endif
2918
2919 sk->sk_max_pacing_rate = ~0UL;
2920 sk->sk_pacing_rate = ~0UL;
2921 sk->sk_pacing_shift = 10;
2922 sk->sk_incoming_cpu = -1;
2923
2924 sk_rx_queue_clear(sk);
2925 /*
2926 * Before updating sk_refcnt, we must commit prior changes to memory
2927 * (Documentation/RCU/rculist_nulls.txt for details)
2928 */
2929 smp_wmb();
2930 refcount_set(&sk->sk_refcnt, 1);
2931 atomic_set(&sk->sk_drops, 0);
2932}
2933EXPORT_SYMBOL(sock_init_data);
2934
2935void lock_sock_nested(struct sock *sk, int subclass)
2936{
2937 might_sleep();
2938 spin_lock_bh(&sk->sk_lock.slock);
2939 if (sk->sk_lock.owned)
2940 __lock_sock(sk);
2941 sk->sk_lock.owned = 1;
2942 spin_unlock(&sk->sk_lock.slock);
2943 /*
2944 * The sk_lock has mutex_lock() semantics here:
2945 */
2946 mutex_acquire(&sk->sk_lock.dep_map, subclass, 0, _RET_IP_);
2947 local_bh_enable();
2948}
2949EXPORT_SYMBOL(lock_sock_nested);
2950
2951void release_sock(struct sock *sk)
2952{
2953 spin_lock_bh(&sk->sk_lock.slock);
2954 if (sk->sk_backlog.tail)
2955 __release_sock(sk);
2956
2957 /* Warning : release_cb() might need to release sk ownership,
2958 * ie call sock_release_ownership(sk) before us.
2959 */
2960 if (sk->sk_prot->release_cb)
2961 sk->sk_prot->release_cb(sk);
2962
2963 sock_release_ownership(sk);
2964 if (waitqueue_active(&sk->sk_lock.wq))
2965 wake_up(&sk->sk_lock.wq);
2966 spin_unlock_bh(&sk->sk_lock.slock);
2967}
2968EXPORT_SYMBOL(release_sock);
2969
2970/**
2971 * lock_sock_fast - fast version of lock_sock
2972 * @sk: socket
2973 *
2974 * This version should be used for very small section, where process wont block
2975 * return false if fast path is taken:
2976 *
2977 * sk_lock.slock locked, owned = 0, BH disabled
2978 *
2979 * return true if slow path is taken:
2980 *
2981 * sk_lock.slock unlocked, owned = 1, BH enabled
2982 */
2983bool lock_sock_fast(struct sock *sk)
2984{
2985 might_sleep();
2986 spin_lock_bh(&sk->sk_lock.slock);
2987
2988 if (!sk->sk_lock.owned)
2989 /*
2990 * Note : We must disable BH
2991 */
2992 return false;
2993
2994 __lock_sock(sk);
2995 sk->sk_lock.owned = 1;
2996 spin_unlock(&sk->sk_lock.slock);
2997 /*
2998 * The sk_lock has mutex_lock() semantics here:
2999 */
3000 mutex_acquire(&sk->sk_lock.dep_map, 0, 0, _RET_IP_);
3001 local_bh_enable();
3002 return true;
3003}
3004EXPORT_SYMBOL(lock_sock_fast);
3005
3006int sock_gettstamp(struct socket *sock, void __user *userstamp,
3007 bool timeval, bool time32)
3008{
3009 struct sock *sk = sock->sk;
3010 struct timespec64 ts;
3011
3012 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
3013 ts = ktime_to_timespec64(sock_read_timestamp(sk));
3014 if (ts.tv_sec == -1)
3015 return -ENOENT;
3016 if (ts.tv_sec == 0) {
3017 ktime_t kt = ktime_get_real();
3018 sock_write_timestamp(sk, kt);;
3019 ts = ktime_to_timespec64(kt);
3020 }
3021
3022 if (timeval)
3023 ts.tv_nsec /= 1000;
3024
3025#ifdef CONFIG_COMPAT_32BIT_TIME
3026 if (time32)
3027 return put_old_timespec32(&ts, userstamp);
3028#endif
3029#ifdef CONFIG_SPARC64
3030 /* beware of padding in sparc64 timeval */
3031 if (timeval && !in_compat_syscall()) {
3032 struct __kernel_old_timeval __user tv = {
3033 .tv_sec = ts.tv_sec,
3034 .tv_usec = ts.tv_nsec,
3035 };
3036 if (copy_to_user(userstamp, &tv, sizeof(tv)))
3037 return -EFAULT;
3038 return 0;
3039 }
3040#endif
3041 return put_timespec64(&ts, userstamp);
3042}
3043EXPORT_SYMBOL(sock_gettstamp);
3044
3045void sock_enable_timestamp(struct sock *sk, int flag)
3046{
3047 if (!sock_flag(sk, flag)) {
3048 unsigned long previous_flags = sk->sk_flags;
3049
3050 sock_set_flag(sk, flag);
3051 /*
3052 * we just set one of the two flags which require net
3053 * time stamping, but time stamping might have been on
3054 * already because of the other one
3055 */
3056 if (sock_needs_netstamp(sk) &&
3057 !(previous_flags & SK_FLAGS_TIMESTAMP))
3058 net_enable_timestamp();
3059 }
3060}
3061
3062int sock_recv_errqueue(struct sock *sk, struct msghdr *msg, int len,
3063 int level, int type)
3064{
3065 struct sock_exterr_skb *serr;
3066 struct sk_buff *skb;
3067 int copied, err;
3068
3069 err = -EAGAIN;
3070 skb = sock_dequeue_err_skb(sk);
3071 if (skb == NULL)
3072 goto out;
3073
3074 copied = skb->len;
3075 if (copied > len) {
3076 msg->msg_flags |= MSG_TRUNC;
3077 copied = len;
3078 }
3079 err = skb_copy_datagram_msg(skb, 0, msg, copied);
3080 if (err)
3081 goto out_free_skb;
3082
3083 sock_recv_timestamp(msg, sk, skb);
3084
3085 serr = SKB_EXT_ERR(skb);
3086 put_cmsg(msg, level, type, sizeof(serr->ee), &serr->ee);
3087
3088 msg->msg_flags |= MSG_ERRQUEUE;
3089 err = copied;
3090
3091out_free_skb:
3092 kfree_skb(skb);
3093out:
3094 return err;
3095}
3096EXPORT_SYMBOL(sock_recv_errqueue);
3097
3098/*
3099 * Get a socket option on an socket.
3100 *
3101 * FIX: POSIX 1003.1g is very ambiguous here. It states that
3102 * asynchronous errors should be reported by getsockopt. We assume
3103 * this means if you specify SO_ERROR (otherwise whats the point of it).
3104 */
3105int sock_common_getsockopt(struct socket *sock, int level, int optname,
3106 char __user *optval, int __user *optlen)
3107{
3108 struct sock *sk = sock->sk;
3109
3110 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
3111}
3112EXPORT_SYMBOL(sock_common_getsockopt);
3113
3114#ifdef CONFIG_COMPAT
3115int compat_sock_common_getsockopt(struct socket *sock, int level, int optname,
3116 char __user *optval, int __user *optlen)
3117{
3118 struct sock *sk = sock->sk;
3119
3120 if (sk->sk_prot->compat_getsockopt != NULL)
3121 return sk->sk_prot->compat_getsockopt(sk, level, optname,
3122 optval, optlen);
3123 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
3124}
3125EXPORT_SYMBOL(compat_sock_common_getsockopt);
3126#endif
3127
3128int sock_common_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
3129 int flags)
3130{
3131 struct sock *sk = sock->sk;
3132 int addr_len = 0;
3133 int err;
3134
3135 err = sk->sk_prot->recvmsg(sk, msg, size, flags & MSG_DONTWAIT,
3136 flags & ~MSG_DONTWAIT, &addr_len);
3137 if (err >= 0)
3138 msg->msg_namelen = addr_len;
3139 return err;
3140}
3141EXPORT_SYMBOL(sock_common_recvmsg);
3142
3143/*
3144 * Set socket options on an inet socket.
3145 */
3146int sock_common_setsockopt(struct socket *sock, int level, int optname,
3147 char __user *optval, unsigned int optlen)
3148{
3149 struct sock *sk = sock->sk;
3150
3151 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
3152}
3153EXPORT_SYMBOL(sock_common_setsockopt);
3154
3155#ifdef CONFIG_COMPAT
3156int compat_sock_common_setsockopt(struct socket *sock, int level, int optname,
3157 char __user *optval, unsigned int optlen)
3158{
3159 struct sock *sk = sock->sk;
3160
3161 if (sk->sk_prot->compat_setsockopt != NULL)
3162 return sk->sk_prot->compat_setsockopt(sk, level, optname,
3163 optval, optlen);
3164 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
3165}
3166EXPORT_SYMBOL(compat_sock_common_setsockopt);
3167#endif
3168
3169void sk_common_release(struct sock *sk)
3170{
3171 if (sk->sk_prot->destroy)
3172 sk->sk_prot->destroy(sk);
3173
3174 /*
3175 * Observation: when sock_common_release is called, processes have
3176 * no access to socket. But net still has.
3177 * Step one, detach it from networking:
3178 *
3179 * A. Remove from hash tables.
3180 */
3181
3182 sk->sk_prot->unhash(sk);
3183
3184 /*
3185 * In this point socket cannot receive new packets, but it is possible
3186 * that some packets are in flight because some CPU runs receiver and
3187 * did hash table lookup before we unhashed socket. They will achieve
3188 * receive queue and will be purged by socket destructor.
3189 *
3190 * Also we still have packets pending on receive queue and probably,
3191 * our own packets waiting in device queues. sock_destroy will drain
3192 * receive queue, but transmitted packets will delay socket destruction
3193 * until the last reference will be released.
3194 */
3195
3196 sock_orphan(sk);
3197
3198 xfrm_sk_free_policy(sk);
3199
3200 sk_refcnt_debug_release(sk);
3201
3202 sock_put(sk);
3203}
3204EXPORT_SYMBOL(sk_common_release);
3205
3206void sk_get_meminfo(const struct sock *sk, u32 *mem)
3207{
3208 memset(mem, 0, sizeof(*mem) * SK_MEMINFO_VARS);
3209
3210 mem[SK_MEMINFO_RMEM_ALLOC] = sk_rmem_alloc_get(sk);
3211 mem[SK_MEMINFO_RCVBUF] = READ_ONCE(sk->sk_rcvbuf);
3212 mem[SK_MEMINFO_WMEM_ALLOC] = sk_wmem_alloc_get(sk);
3213 mem[SK_MEMINFO_SNDBUF] = READ_ONCE(sk->sk_sndbuf);
3214 mem[SK_MEMINFO_FWD_ALLOC] = sk->sk_forward_alloc;
3215 mem[SK_MEMINFO_WMEM_QUEUED] = READ_ONCE(sk->sk_wmem_queued);
3216 mem[SK_MEMINFO_OPTMEM] = atomic_read(&sk->sk_omem_alloc);
3217 mem[SK_MEMINFO_BACKLOG] = READ_ONCE(sk->sk_backlog.len);
3218 mem[SK_MEMINFO_DROPS] = atomic_read(&sk->sk_drops);
3219}
3220
3221#ifdef CONFIG_PROC_FS
3222#define PROTO_INUSE_NR 64 /* should be enough for the first time */
3223struct prot_inuse {
3224 int val[PROTO_INUSE_NR];
3225};
3226
3227static DECLARE_BITMAP(proto_inuse_idx, PROTO_INUSE_NR);
3228
3229void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
3230{
3231 __this_cpu_add(net->core.prot_inuse->val[prot->inuse_idx], val);
3232}
3233EXPORT_SYMBOL_GPL(sock_prot_inuse_add);
3234
3235int sock_prot_inuse_get(struct net *net, struct proto *prot)
3236{
3237 int cpu, idx = prot->inuse_idx;
3238 int res = 0;
3239
3240 for_each_possible_cpu(cpu)
3241 res += per_cpu_ptr(net->core.prot_inuse, cpu)->val[idx];
3242
3243 return res >= 0 ? res : 0;
3244}
3245EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
3246
3247static void sock_inuse_add(struct net *net, int val)
3248{
3249 this_cpu_add(*net->core.sock_inuse, val);
3250}
3251
3252int sock_inuse_get(struct net *net)
3253{
3254 int cpu, res = 0;
3255
3256 for_each_possible_cpu(cpu)
3257 res += *per_cpu_ptr(net->core.sock_inuse, cpu);
3258
3259 return res;
3260}
3261
3262EXPORT_SYMBOL_GPL(sock_inuse_get);
3263
3264static int __net_init sock_inuse_init_net(struct net *net)
3265{
3266 net->core.prot_inuse = alloc_percpu(struct prot_inuse);
3267 if (net->core.prot_inuse == NULL)
3268 return -ENOMEM;
3269
3270 net->core.sock_inuse = alloc_percpu(int);
3271 if (net->core.sock_inuse == NULL)
3272 goto out;
3273
3274 return 0;
3275
3276out:
3277 free_percpu(net->core.prot_inuse);
3278 return -ENOMEM;
3279}
3280
3281static void __net_exit sock_inuse_exit_net(struct net *net)
3282{
3283 free_percpu(net->core.prot_inuse);
3284 free_percpu(net->core.sock_inuse);
3285}
3286
3287static struct pernet_operations net_inuse_ops = {
3288 .init = sock_inuse_init_net,
3289 .exit = sock_inuse_exit_net,
3290};
3291
3292static __init int net_inuse_init(void)
3293{
3294 if (register_pernet_subsys(&net_inuse_ops))
3295 panic("Cannot initialize net inuse counters");
3296
3297 return 0;
3298}
3299
3300core_initcall(net_inuse_init);
3301
3302static int assign_proto_idx(struct proto *prot)
3303{
3304 prot->inuse_idx = find_first_zero_bit(proto_inuse_idx, PROTO_INUSE_NR);
3305
3306 if (unlikely(prot->inuse_idx == PROTO_INUSE_NR - 1)) {
3307 pr_err("PROTO_INUSE_NR exhausted\n");
3308 return -ENOSPC;
3309 }
3310
3311 set_bit(prot->inuse_idx, proto_inuse_idx);
3312 return 0;
3313}
3314
3315static void release_proto_idx(struct proto *prot)
3316{
3317 if (prot->inuse_idx != PROTO_INUSE_NR - 1)
3318 clear_bit(prot->inuse_idx, proto_inuse_idx);
3319}
3320#else
3321static inline int assign_proto_idx(struct proto *prot)
3322{
3323 return 0;
3324}
3325
3326static inline void release_proto_idx(struct proto *prot)
3327{
3328}
3329
3330static void sock_inuse_add(struct net *net, int val)
3331{
3332}
3333#endif
3334
3335static void req_prot_cleanup(struct request_sock_ops *rsk_prot)
3336{
3337 if (!rsk_prot)
3338 return;
3339 kfree(rsk_prot->slab_name);
3340 rsk_prot->slab_name = NULL;
3341 kmem_cache_destroy(rsk_prot->slab);
3342 rsk_prot->slab = NULL;
3343}
3344
3345static int req_prot_init(const struct proto *prot)
3346{
3347 struct request_sock_ops *rsk_prot = prot->rsk_prot;
3348
3349 if (!rsk_prot)
3350 return 0;
3351
3352 rsk_prot->slab_name = kasprintf(GFP_KERNEL, "request_sock_%s",
3353 prot->name);
3354 if (!rsk_prot->slab_name)
3355 return -ENOMEM;
3356
3357 rsk_prot->slab = kmem_cache_create(rsk_prot->slab_name,
3358 rsk_prot->obj_size, 0,
3359 SLAB_ACCOUNT | prot->slab_flags,
3360 NULL);
3361
3362 if (!rsk_prot->slab) {
3363 pr_crit("%s: Can't create request sock SLAB cache!\n",
3364 prot->name);
3365 return -ENOMEM;
3366 }
3367 return 0;
3368}
3369
3370int proto_register(struct proto *prot, int alloc_slab)
3371{
3372 int ret = -ENOBUFS;
3373
3374 if (alloc_slab) {
3375 prot->slab = kmem_cache_create_usercopy(prot->name,
3376 prot->obj_size, 0,
3377 SLAB_HWCACHE_ALIGN | SLAB_ACCOUNT |
3378 prot->slab_flags,
3379 prot->useroffset, prot->usersize,
3380 NULL);
3381
3382 if (prot->slab == NULL) {
3383 pr_crit("%s: Can't create sock SLAB cache!\n",
3384 prot->name);
3385 goto out;
3386 }
3387
3388 if (req_prot_init(prot))
3389 goto out_free_request_sock_slab;
3390
3391 if (prot->twsk_prot != NULL) {
3392 prot->twsk_prot->twsk_slab_name = kasprintf(GFP_KERNEL, "tw_sock_%s", prot->name);
3393
3394 if (prot->twsk_prot->twsk_slab_name == NULL)
3395 goto out_free_request_sock_slab;
3396
3397 prot->twsk_prot->twsk_slab =
3398 kmem_cache_create(prot->twsk_prot->twsk_slab_name,
3399 prot->twsk_prot->twsk_obj_size,
3400 0,
3401 SLAB_ACCOUNT |
3402 prot->slab_flags,
3403 NULL);
3404 if (prot->twsk_prot->twsk_slab == NULL)
3405 goto out_free_timewait_sock_slab_name;
3406 }
3407 }
3408
3409 mutex_lock(&proto_list_mutex);
3410 ret = assign_proto_idx(prot);
3411 if (ret) {
3412 mutex_unlock(&proto_list_mutex);
3413 goto out_free_timewait_sock_slab_name;
3414 }
3415 list_add(&prot->node, &proto_list);
3416 mutex_unlock(&proto_list_mutex);
3417 return ret;
3418
3419out_free_timewait_sock_slab_name:
3420 if (alloc_slab && prot->twsk_prot)
3421 kfree(prot->twsk_prot->twsk_slab_name);
3422out_free_request_sock_slab:
3423 if (alloc_slab) {
3424 req_prot_cleanup(prot->rsk_prot);
3425
3426 kmem_cache_destroy(prot->slab);
3427 prot->slab = NULL;
3428 }
3429out:
3430 return ret;
3431}
3432EXPORT_SYMBOL(proto_register);
3433
3434void proto_unregister(struct proto *prot)
3435{
3436 mutex_lock(&proto_list_mutex);
3437 release_proto_idx(prot);
3438 list_del(&prot->node);
3439 mutex_unlock(&proto_list_mutex);
3440
3441 kmem_cache_destroy(prot->slab);
3442 prot->slab = NULL;
3443
3444 req_prot_cleanup(prot->rsk_prot);
3445
3446 if (prot->twsk_prot != NULL && prot->twsk_prot->twsk_slab != NULL) {
3447 kmem_cache_destroy(prot->twsk_prot->twsk_slab);
3448 kfree(prot->twsk_prot->twsk_slab_name);
3449 prot->twsk_prot->twsk_slab = NULL;
3450 }
3451}
3452EXPORT_SYMBOL(proto_unregister);
3453
3454int sock_load_diag_module(int family, int protocol)
3455{
3456 if (!protocol) {
3457 if (!sock_is_registered(family))
3458 return -ENOENT;
3459
3460 return request_module("net-pf-%d-proto-%d-type-%d", PF_NETLINK,
3461 NETLINK_SOCK_DIAG, family);
3462 }
3463
3464#ifdef CONFIG_INET
3465 if (family == AF_INET &&
3466 protocol != IPPROTO_RAW &&
3467 !rcu_access_pointer(inet_protos[protocol]))
3468 return -ENOENT;
3469#endif
3470
3471 return request_module("net-pf-%d-proto-%d-type-%d-%d", PF_NETLINK,
3472 NETLINK_SOCK_DIAG, family, protocol);
3473}
3474EXPORT_SYMBOL(sock_load_diag_module);
3475
3476#ifdef CONFIG_PROC_FS
3477static void *proto_seq_start(struct seq_file *seq, loff_t *pos)
3478 __acquires(proto_list_mutex)
3479{
3480 mutex_lock(&proto_list_mutex);
3481 return seq_list_start_head(&proto_list, *pos);
3482}
3483
3484static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3485{
3486 return seq_list_next(v, &proto_list, pos);
3487}
3488
3489static void proto_seq_stop(struct seq_file *seq, void *v)
3490 __releases(proto_list_mutex)
3491{
3492 mutex_unlock(&proto_list_mutex);
3493}
3494
3495static char proto_method_implemented(const void *method)
3496{
3497 return method == NULL ? 'n' : 'y';
3498}
3499static long sock_prot_memory_allocated(struct proto *proto)
3500{
3501 return proto->memory_allocated != NULL ? proto_memory_allocated(proto) : -1L;
3502}
3503
3504static const char *sock_prot_memory_pressure(struct proto *proto)
3505{
3506 return proto->memory_pressure != NULL ?
3507 proto_memory_pressure(proto) ? "yes" : "no" : "NI";
3508}
3509
3510static void proto_seq_printf(struct seq_file *seq, struct proto *proto)
3511{
3512
3513 seq_printf(seq, "%-9s %4u %6d %6ld %-3s %6u %-3s %-10s "
3514 "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n",
3515 proto->name,
3516 proto->obj_size,
3517 sock_prot_inuse_get(seq_file_net(seq), proto),
3518 sock_prot_memory_allocated(proto),
3519 sock_prot_memory_pressure(proto),
3520 proto->max_header,
3521 proto->slab == NULL ? "no" : "yes",
3522 module_name(proto->owner),
3523 proto_method_implemented(proto->close),
3524 proto_method_implemented(proto->connect),
3525 proto_method_implemented(proto->disconnect),
3526 proto_method_implemented(proto->accept),
3527 proto_method_implemented(proto->ioctl),
3528 proto_method_implemented(proto->init),
3529 proto_method_implemented(proto->destroy),
3530 proto_method_implemented(proto->shutdown),
3531 proto_method_implemented(proto->setsockopt),
3532 proto_method_implemented(proto->getsockopt),
3533 proto_method_implemented(proto->sendmsg),
3534 proto_method_implemented(proto->recvmsg),
3535 proto_method_implemented(proto->sendpage),
3536 proto_method_implemented(proto->bind),
3537 proto_method_implemented(proto->backlog_rcv),
3538 proto_method_implemented(proto->hash),
3539 proto_method_implemented(proto->unhash),
3540 proto_method_implemented(proto->get_port),
3541 proto_method_implemented(proto->enter_memory_pressure));
3542}
3543
3544static int proto_seq_show(struct seq_file *seq, void *v)
3545{
3546 if (v == &proto_list)
3547 seq_printf(seq, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s",
3548 "protocol",
3549 "size",
3550 "sockets",
3551 "memory",
3552 "press",
3553 "maxhdr",
3554 "slab",
3555 "module",
3556 "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n");
3557 else
3558 proto_seq_printf(seq, list_entry(v, struct proto, node));
3559 return 0;
3560}
3561
3562static const struct seq_operations proto_seq_ops = {
3563 .start = proto_seq_start,
3564 .next = proto_seq_next,
3565 .stop = proto_seq_stop,
3566 .show = proto_seq_show,
3567};
3568
3569static __net_init int proto_init_net(struct net *net)
3570{
3571 if (!proc_create_net("protocols", 0444, net->proc_net, &proto_seq_ops,
3572 sizeof(struct seq_net_private)))
3573 return -ENOMEM;
3574
3575 return 0;
3576}
3577
3578static __net_exit void proto_exit_net(struct net *net)
3579{
3580 remove_proc_entry("protocols", net->proc_net);
3581}
3582
3583
3584static __net_initdata struct pernet_operations proto_net_ops = {
3585 .init = proto_init_net,
3586 .exit = proto_exit_net,
3587};
3588
3589static int __init proto_init(void)
3590{
3591 return register_pernet_subsys(&proto_net_ops);
3592}
3593
3594subsys_initcall(proto_init);
3595
3596#endif /* PROC_FS */
3597
3598#ifdef CONFIG_NET_RX_BUSY_POLL
3599bool sk_busy_loop_end(void *p, unsigned long start_time)
3600{
3601 struct sock *sk = p;
3602
3603 return !skb_queue_empty_lockless(&sk->sk_receive_queue) ||
3604 sk_busy_loop_timeout(sk, start_time);
3605}
3606EXPORT_SYMBOL(sk_busy_loop_end);
3607#endif /* CONFIG_NET_RX_BUSY_POLL */
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#include <linux/ethtool.h>
143
144#include "dev.h"
145
146static DEFINE_MUTEX(proto_list_mutex);
147static LIST_HEAD(proto_list);
148
149static void sock_def_write_space_wfree(struct sock *sk);
150static void sock_def_write_space(struct sock *sk);
151
152/**
153 * sk_ns_capable - General socket capability test
154 * @sk: Socket to use a capability on or through
155 * @user_ns: The user namespace of the capability to use
156 * @cap: The capability to use
157 *
158 * Test to see if the opener of the socket had when the socket was
159 * created and the current process has the capability @cap in the user
160 * namespace @user_ns.
161 */
162bool sk_ns_capable(const struct sock *sk,
163 struct user_namespace *user_ns, int cap)
164{
165 return file_ns_capable(sk->sk_socket->file, user_ns, cap) &&
166 ns_capable(user_ns, cap);
167}
168EXPORT_SYMBOL(sk_ns_capable);
169
170/**
171 * sk_capable - Socket global capability test
172 * @sk: Socket to use a capability on or through
173 * @cap: The global capability to use
174 *
175 * Test to see if the opener of the socket had when the socket was
176 * created and the current process has the capability @cap in all user
177 * namespaces.
178 */
179bool sk_capable(const struct sock *sk, int cap)
180{
181 return sk_ns_capable(sk, &init_user_ns, cap);
182}
183EXPORT_SYMBOL(sk_capable);
184
185/**
186 * sk_net_capable - Network namespace socket capability test
187 * @sk: Socket to use a capability on or through
188 * @cap: The capability to use
189 *
190 * Test to see if the opener of the socket had when the socket was created
191 * and the current process has the capability @cap over the network namespace
192 * the socket is a member of.
193 */
194bool sk_net_capable(const struct sock *sk, int cap)
195{
196 return sk_ns_capable(sk, sock_net(sk)->user_ns, cap);
197}
198EXPORT_SYMBOL(sk_net_capable);
199
200/*
201 * Each address family might have different locking rules, so we have
202 * one slock key per address family and separate keys for internal and
203 * userspace sockets.
204 */
205static struct lock_class_key af_family_keys[AF_MAX];
206static struct lock_class_key af_family_kern_keys[AF_MAX];
207static struct lock_class_key af_family_slock_keys[AF_MAX];
208static struct lock_class_key af_family_kern_slock_keys[AF_MAX];
209
210/*
211 * Make lock validator output more readable. (we pre-construct these
212 * strings build-time, so that runtime initialization of socket
213 * locks is fast):
214 */
215
216#define _sock_locks(x) \
217 x "AF_UNSPEC", x "AF_UNIX" , x "AF_INET" , \
218 x "AF_AX25" , x "AF_IPX" , x "AF_APPLETALK", \
219 x "AF_NETROM", x "AF_BRIDGE" , x "AF_ATMPVC" , \
220 x "AF_X25" , x "AF_INET6" , x "AF_ROSE" , \
221 x "AF_DECnet", x "AF_NETBEUI" , x "AF_SECURITY" , \
222 x "AF_KEY" , x "AF_NETLINK" , x "AF_PACKET" , \
223 x "AF_ASH" , x "AF_ECONET" , x "AF_ATMSVC" , \
224 x "AF_RDS" , x "AF_SNA" , x "AF_IRDA" , \
225 x "AF_PPPOX" , x "AF_WANPIPE" , x "AF_LLC" , \
226 x "27" , x "28" , x "AF_CAN" , \
227 x "AF_TIPC" , x "AF_BLUETOOTH", x "IUCV" , \
228 x "AF_RXRPC" , x "AF_ISDN" , x "AF_PHONET" , \
229 x "AF_IEEE802154", x "AF_CAIF" , x "AF_ALG" , \
230 x "AF_NFC" , x "AF_VSOCK" , x "AF_KCM" , \
231 x "AF_QIPCRTR", x "AF_SMC" , x "AF_XDP" , \
232 x "AF_MCTP" , \
233 x "AF_MAX"
234
235static const char *const af_family_key_strings[AF_MAX+1] = {
236 _sock_locks("sk_lock-")
237};
238static const char *const af_family_slock_key_strings[AF_MAX+1] = {
239 _sock_locks("slock-")
240};
241static const char *const af_family_clock_key_strings[AF_MAX+1] = {
242 _sock_locks("clock-")
243};
244
245static const char *const af_family_kern_key_strings[AF_MAX+1] = {
246 _sock_locks("k-sk_lock-")
247};
248static const char *const af_family_kern_slock_key_strings[AF_MAX+1] = {
249 _sock_locks("k-slock-")
250};
251static const char *const af_family_kern_clock_key_strings[AF_MAX+1] = {
252 _sock_locks("k-clock-")
253};
254static const char *const af_family_rlock_key_strings[AF_MAX+1] = {
255 _sock_locks("rlock-")
256};
257static const char *const af_family_wlock_key_strings[AF_MAX+1] = {
258 _sock_locks("wlock-")
259};
260static const char *const af_family_elock_key_strings[AF_MAX+1] = {
261 _sock_locks("elock-")
262};
263
264/*
265 * sk_callback_lock and sk queues locking rules are per-address-family,
266 * so split the lock classes by using a per-AF key:
267 */
268static struct lock_class_key af_callback_keys[AF_MAX];
269static struct lock_class_key af_rlock_keys[AF_MAX];
270static struct lock_class_key af_wlock_keys[AF_MAX];
271static struct lock_class_key af_elock_keys[AF_MAX];
272static struct lock_class_key af_kern_callback_keys[AF_MAX];
273
274/* Run time adjustable parameters. */
275__u32 sysctl_wmem_max __read_mostly = SK_WMEM_MAX;
276EXPORT_SYMBOL(sysctl_wmem_max);
277__u32 sysctl_rmem_max __read_mostly = SK_RMEM_MAX;
278EXPORT_SYMBOL(sysctl_rmem_max);
279__u32 sysctl_wmem_default __read_mostly = SK_WMEM_MAX;
280__u32 sysctl_rmem_default __read_mostly = SK_RMEM_MAX;
281
282/* Maximal space eaten by iovec or ancillary data plus some space */
283int sysctl_optmem_max __read_mostly = sizeof(unsigned long)*(2*UIO_MAXIOV+512);
284EXPORT_SYMBOL(sysctl_optmem_max);
285
286int sysctl_tstamp_allow_data __read_mostly = 1;
287
288DEFINE_STATIC_KEY_FALSE(memalloc_socks_key);
289EXPORT_SYMBOL_GPL(memalloc_socks_key);
290
291/**
292 * sk_set_memalloc - sets %SOCK_MEMALLOC
293 * @sk: socket to set it on
294 *
295 * Set %SOCK_MEMALLOC on a socket for access to emergency reserves.
296 * It's the responsibility of the admin to adjust min_free_kbytes
297 * to meet the requirements
298 */
299void sk_set_memalloc(struct sock *sk)
300{
301 sock_set_flag(sk, SOCK_MEMALLOC);
302 sk->sk_allocation |= __GFP_MEMALLOC;
303 static_branch_inc(&memalloc_socks_key);
304}
305EXPORT_SYMBOL_GPL(sk_set_memalloc);
306
307void sk_clear_memalloc(struct sock *sk)
308{
309 sock_reset_flag(sk, SOCK_MEMALLOC);
310 sk->sk_allocation &= ~__GFP_MEMALLOC;
311 static_branch_dec(&memalloc_socks_key);
312
313 /*
314 * SOCK_MEMALLOC is allowed to ignore rmem limits to ensure forward
315 * progress of swapping. SOCK_MEMALLOC may be cleared while
316 * it has rmem allocations due to the last swapfile being deactivated
317 * but there is a risk that the socket is unusable due to exceeding
318 * the rmem limits. Reclaim the reserves and obey rmem limits again.
319 */
320 sk_mem_reclaim(sk);
321}
322EXPORT_SYMBOL_GPL(sk_clear_memalloc);
323
324int __sk_backlog_rcv(struct sock *sk, struct sk_buff *skb)
325{
326 int ret;
327 unsigned int noreclaim_flag;
328
329 /* these should have been dropped before queueing */
330 BUG_ON(!sock_flag(sk, SOCK_MEMALLOC));
331
332 noreclaim_flag = memalloc_noreclaim_save();
333 ret = INDIRECT_CALL_INET(sk->sk_backlog_rcv,
334 tcp_v6_do_rcv,
335 tcp_v4_do_rcv,
336 sk, skb);
337 memalloc_noreclaim_restore(noreclaim_flag);
338
339 return ret;
340}
341EXPORT_SYMBOL(__sk_backlog_rcv);
342
343void sk_error_report(struct sock *sk)
344{
345 sk->sk_error_report(sk);
346
347 switch (sk->sk_family) {
348 case AF_INET:
349 fallthrough;
350 case AF_INET6:
351 trace_inet_sk_error_report(sk);
352 break;
353 default:
354 break;
355 }
356}
357EXPORT_SYMBOL(sk_error_report);
358
359int sock_get_timeout(long timeo, void *optval, bool old_timeval)
360{
361 struct __kernel_sock_timeval tv;
362
363 if (timeo == MAX_SCHEDULE_TIMEOUT) {
364 tv.tv_sec = 0;
365 tv.tv_usec = 0;
366 } else {
367 tv.tv_sec = timeo / HZ;
368 tv.tv_usec = ((timeo % HZ) * USEC_PER_SEC) / HZ;
369 }
370
371 if (old_timeval && in_compat_syscall() && !COMPAT_USE_64BIT_TIME) {
372 struct old_timeval32 tv32 = { tv.tv_sec, tv.tv_usec };
373 *(struct old_timeval32 *)optval = tv32;
374 return sizeof(tv32);
375 }
376
377 if (old_timeval) {
378 struct __kernel_old_timeval old_tv;
379 old_tv.tv_sec = tv.tv_sec;
380 old_tv.tv_usec = tv.tv_usec;
381 *(struct __kernel_old_timeval *)optval = old_tv;
382 return sizeof(old_tv);
383 }
384
385 *(struct __kernel_sock_timeval *)optval = tv;
386 return sizeof(tv);
387}
388EXPORT_SYMBOL(sock_get_timeout);
389
390int sock_copy_user_timeval(struct __kernel_sock_timeval *tv,
391 sockptr_t optval, int optlen, bool old_timeval)
392{
393 if (old_timeval && in_compat_syscall() && !COMPAT_USE_64BIT_TIME) {
394 struct old_timeval32 tv32;
395
396 if (optlen < sizeof(tv32))
397 return -EINVAL;
398
399 if (copy_from_sockptr(&tv32, optval, sizeof(tv32)))
400 return -EFAULT;
401 tv->tv_sec = tv32.tv_sec;
402 tv->tv_usec = tv32.tv_usec;
403 } else if (old_timeval) {
404 struct __kernel_old_timeval old_tv;
405
406 if (optlen < sizeof(old_tv))
407 return -EINVAL;
408 if (copy_from_sockptr(&old_tv, optval, sizeof(old_tv)))
409 return -EFAULT;
410 tv->tv_sec = old_tv.tv_sec;
411 tv->tv_usec = old_tv.tv_usec;
412 } else {
413 if (optlen < sizeof(*tv))
414 return -EINVAL;
415 if (copy_from_sockptr(tv, optval, sizeof(*tv)))
416 return -EFAULT;
417 }
418
419 return 0;
420}
421EXPORT_SYMBOL(sock_copy_user_timeval);
422
423static int sock_set_timeout(long *timeo_p, sockptr_t optval, int optlen,
424 bool old_timeval)
425{
426 struct __kernel_sock_timeval tv;
427 int err = sock_copy_user_timeval(&tv, optval, optlen, old_timeval);
428
429 if (err)
430 return err;
431
432 if (tv.tv_usec < 0 || tv.tv_usec >= USEC_PER_SEC)
433 return -EDOM;
434
435 if (tv.tv_sec < 0) {
436 static int warned __read_mostly;
437
438 *timeo_p = 0;
439 if (warned < 10 && net_ratelimit()) {
440 warned++;
441 pr_info("%s: `%s' (pid %d) tries to set negative timeout\n",
442 __func__, current->comm, task_pid_nr(current));
443 }
444 return 0;
445 }
446 *timeo_p = MAX_SCHEDULE_TIMEOUT;
447 if (tv.tv_sec == 0 && tv.tv_usec == 0)
448 return 0;
449 if (tv.tv_sec < (MAX_SCHEDULE_TIMEOUT / HZ - 1))
450 *timeo_p = tv.tv_sec * HZ + DIV_ROUND_UP((unsigned long)tv.tv_usec, USEC_PER_SEC / HZ);
451 return 0;
452}
453
454static bool sock_needs_netstamp(const struct sock *sk)
455{
456 switch (sk->sk_family) {
457 case AF_UNSPEC:
458 case AF_UNIX:
459 return false;
460 default:
461 return true;
462 }
463}
464
465static void sock_disable_timestamp(struct sock *sk, unsigned long flags)
466{
467 if (sk->sk_flags & flags) {
468 sk->sk_flags &= ~flags;
469 if (sock_needs_netstamp(sk) &&
470 !(sk->sk_flags & SK_FLAGS_TIMESTAMP))
471 net_disable_timestamp();
472 }
473}
474
475
476int __sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
477{
478 unsigned long flags;
479 struct sk_buff_head *list = &sk->sk_receive_queue;
480
481 if (atomic_read(&sk->sk_rmem_alloc) >= sk->sk_rcvbuf) {
482 atomic_inc(&sk->sk_drops);
483 trace_sock_rcvqueue_full(sk, skb);
484 return -ENOMEM;
485 }
486
487 if (!sk_rmem_schedule(sk, skb, skb->truesize)) {
488 atomic_inc(&sk->sk_drops);
489 return -ENOBUFS;
490 }
491
492 skb->dev = NULL;
493 skb_set_owner_r(skb, sk);
494
495 /* we escape from rcu protected region, make sure we dont leak
496 * a norefcounted dst
497 */
498 skb_dst_force(skb);
499
500 spin_lock_irqsave(&list->lock, flags);
501 sock_skb_set_dropcount(sk, skb);
502 __skb_queue_tail(list, skb);
503 spin_unlock_irqrestore(&list->lock, flags);
504
505 if (!sock_flag(sk, SOCK_DEAD))
506 sk->sk_data_ready(sk);
507 return 0;
508}
509EXPORT_SYMBOL(__sock_queue_rcv_skb);
510
511int sock_queue_rcv_skb_reason(struct sock *sk, struct sk_buff *skb,
512 enum skb_drop_reason *reason)
513{
514 enum skb_drop_reason drop_reason;
515 int err;
516
517 err = sk_filter(sk, skb);
518 if (err) {
519 drop_reason = SKB_DROP_REASON_SOCKET_FILTER;
520 goto out;
521 }
522 err = __sock_queue_rcv_skb(sk, skb);
523 switch (err) {
524 case -ENOMEM:
525 drop_reason = SKB_DROP_REASON_SOCKET_RCVBUFF;
526 break;
527 case -ENOBUFS:
528 drop_reason = SKB_DROP_REASON_PROTO_MEM;
529 break;
530 default:
531 drop_reason = SKB_NOT_DROPPED_YET;
532 break;
533 }
534out:
535 if (reason)
536 *reason = drop_reason;
537 return err;
538}
539EXPORT_SYMBOL(sock_queue_rcv_skb_reason);
540
541int __sk_receive_skb(struct sock *sk, struct sk_buff *skb,
542 const int nested, unsigned int trim_cap, bool refcounted)
543{
544 int rc = NET_RX_SUCCESS;
545
546 if (sk_filter_trim_cap(sk, skb, trim_cap))
547 goto discard_and_relse;
548
549 skb->dev = NULL;
550
551 if (sk_rcvqueues_full(sk, sk->sk_rcvbuf)) {
552 atomic_inc(&sk->sk_drops);
553 goto discard_and_relse;
554 }
555 if (nested)
556 bh_lock_sock_nested(sk);
557 else
558 bh_lock_sock(sk);
559 if (!sock_owned_by_user(sk)) {
560 /*
561 * trylock + unlock semantics:
562 */
563 mutex_acquire(&sk->sk_lock.dep_map, 0, 1, _RET_IP_);
564
565 rc = sk_backlog_rcv(sk, skb);
566
567 mutex_release(&sk->sk_lock.dep_map, _RET_IP_);
568 } else if (sk_add_backlog(sk, skb, READ_ONCE(sk->sk_rcvbuf))) {
569 bh_unlock_sock(sk);
570 atomic_inc(&sk->sk_drops);
571 goto discard_and_relse;
572 }
573
574 bh_unlock_sock(sk);
575out:
576 if (refcounted)
577 sock_put(sk);
578 return rc;
579discard_and_relse:
580 kfree_skb(skb);
581 goto out;
582}
583EXPORT_SYMBOL(__sk_receive_skb);
584
585INDIRECT_CALLABLE_DECLARE(struct dst_entry *ip6_dst_check(struct dst_entry *,
586 u32));
587INDIRECT_CALLABLE_DECLARE(struct dst_entry *ipv4_dst_check(struct dst_entry *,
588 u32));
589struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie)
590{
591 struct dst_entry *dst = __sk_dst_get(sk);
592
593 if (dst && dst->obsolete &&
594 INDIRECT_CALL_INET(dst->ops->check, ip6_dst_check, ipv4_dst_check,
595 dst, cookie) == NULL) {
596 sk_tx_queue_clear(sk);
597 sk->sk_dst_pending_confirm = 0;
598 RCU_INIT_POINTER(sk->sk_dst_cache, NULL);
599 dst_release(dst);
600 return NULL;
601 }
602
603 return dst;
604}
605EXPORT_SYMBOL(__sk_dst_check);
606
607struct dst_entry *sk_dst_check(struct sock *sk, u32 cookie)
608{
609 struct dst_entry *dst = sk_dst_get(sk);
610
611 if (dst && dst->obsolete &&
612 INDIRECT_CALL_INET(dst->ops->check, ip6_dst_check, ipv4_dst_check,
613 dst, cookie) == NULL) {
614 sk_dst_reset(sk);
615 dst_release(dst);
616 return NULL;
617 }
618
619 return dst;
620}
621EXPORT_SYMBOL(sk_dst_check);
622
623static int sock_bindtoindex_locked(struct sock *sk, int ifindex)
624{
625 int ret = -ENOPROTOOPT;
626#ifdef CONFIG_NETDEVICES
627 struct net *net = sock_net(sk);
628
629 /* Sorry... */
630 ret = -EPERM;
631 if (sk->sk_bound_dev_if && !ns_capable(net->user_ns, CAP_NET_RAW))
632 goto out;
633
634 ret = -EINVAL;
635 if (ifindex < 0)
636 goto out;
637
638 /* Paired with all READ_ONCE() done locklessly. */
639 WRITE_ONCE(sk->sk_bound_dev_if, ifindex);
640
641 if (sk->sk_prot->rehash)
642 sk->sk_prot->rehash(sk);
643 sk_dst_reset(sk);
644
645 ret = 0;
646
647out:
648#endif
649
650 return ret;
651}
652
653int sock_bindtoindex(struct sock *sk, int ifindex, bool lock_sk)
654{
655 int ret;
656
657 if (lock_sk)
658 lock_sock(sk);
659 ret = sock_bindtoindex_locked(sk, ifindex);
660 if (lock_sk)
661 release_sock(sk);
662
663 return ret;
664}
665EXPORT_SYMBOL(sock_bindtoindex);
666
667static int sock_setbindtodevice(struct sock *sk, sockptr_t optval, int optlen)
668{
669 int ret = -ENOPROTOOPT;
670#ifdef CONFIG_NETDEVICES
671 struct net *net = sock_net(sk);
672 char devname[IFNAMSIZ];
673 int index;
674
675 ret = -EINVAL;
676 if (optlen < 0)
677 goto out;
678
679 /* Bind this socket to a particular device like "eth0",
680 * as specified in the passed interface name. If the
681 * name is "" or the option length is zero the socket
682 * is not bound.
683 */
684 if (optlen > IFNAMSIZ - 1)
685 optlen = IFNAMSIZ - 1;
686 memset(devname, 0, sizeof(devname));
687
688 ret = -EFAULT;
689 if (copy_from_sockptr(devname, optval, optlen))
690 goto out;
691
692 index = 0;
693 if (devname[0] != '\0') {
694 struct net_device *dev;
695
696 rcu_read_lock();
697 dev = dev_get_by_name_rcu(net, devname);
698 if (dev)
699 index = dev->ifindex;
700 rcu_read_unlock();
701 ret = -ENODEV;
702 if (!dev)
703 goto out;
704 }
705
706 sockopt_lock_sock(sk);
707 ret = sock_bindtoindex_locked(sk, index);
708 sockopt_release_sock(sk);
709out:
710#endif
711
712 return ret;
713}
714
715static int sock_getbindtodevice(struct sock *sk, sockptr_t optval,
716 sockptr_t optlen, int len)
717{
718 int ret = -ENOPROTOOPT;
719#ifdef CONFIG_NETDEVICES
720 int bound_dev_if = READ_ONCE(sk->sk_bound_dev_if);
721 struct net *net = sock_net(sk);
722 char devname[IFNAMSIZ];
723
724 if (bound_dev_if == 0) {
725 len = 0;
726 goto zero;
727 }
728
729 ret = -EINVAL;
730 if (len < IFNAMSIZ)
731 goto out;
732
733 ret = netdev_get_name(net, devname, bound_dev_if);
734 if (ret)
735 goto out;
736
737 len = strlen(devname) + 1;
738
739 ret = -EFAULT;
740 if (copy_to_sockptr(optval, devname, len))
741 goto out;
742
743zero:
744 ret = -EFAULT;
745 if (copy_to_sockptr(optlen, &len, sizeof(int)))
746 goto out;
747
748 ret = 0;
749
750out:
751#endif
752
753 return ret;
754}
755
756bool sk_mc_loop(struct sock *sk)
757{
758 if (dev_recursion_level())
759 return false;
760 if (!sk)
761 return true;
762 switch (sk->sk_family) {
763 case AF_INET:
764 return inet_sk(sk)->mc_loop;
765#if IS_ENABLED(CONFIG_IPV6)
766 case AF_INET6:
767 return inet6_sk(sk)->mc_loop;
768#endif
769 }
770 WARN_ON_ONCE(1);
771 return true;
772}
773EXPORT_SYMBOL(sk_mc_loop);
774
775void sock_set_reuseaddr(struct sock *sk)
776{
777 lock_sock(sk);
778 sk->sk_reuse = SK_CAN_REUSE;
779 release_sock(sk);
780}
781EXPORT_SYMBOL(sock_set_reuseaddr);
782
783void sock_set_reuseport(struct sock *sk)
784{
785 lock_sock(sk);
786 sk->sk_reuseport = true;
787 release_sock(sk);
788}
789EXPORT_SYMBOL(sock_set_reuseport);
790
791void sock_no_linger(struct sock *sk)
792{
793 lock_sock(sk);
794 sk->sk_lingertime = 0;
795 sock_set_flag(sk, SOCK_LINGER);
796 release_sock(sk);
797}
798EXPORT_SYMBOL(sock_no_linger);
799
800void sock_set_priority(struct sock *sk, u32 priority)
801{
802 lock_sock(sk);
803 sk->sk_priority = priority;
804 release_sock(sk);
805}
806EXPORT_SYMBOL(sock_set_priority);
807
808void sock_set_sndtimeo(struct sock *sk, s64 secs)
809{
810 lock_sock(sk);
811 if (secs && secs < MAX_SCHEDULE_TIMEOUT / HZ - 1)
812 sk->sk_sndtimeo = secs * HZ;
813 else
814 sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT;
815 release_sock(sk);
816}
817EXPORT_SYMBOL(sock_set_sndtimeo);
818
819static void __sock_set_timestamps(struct sock *sk, bool val, bool new, bool ns)
820{
821 if (val) {
822 sock_valbool_flag(sk, SOCK_TSTAMP_NEW, new);
823 sock_valbool_flag(sk, SOCK_RCVTSTAMPNS, ns);
824 sock_set_flag(sk, SOCK_RCVTSTAMP);
825 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
826 } else {
827 sock_reset_flag(sk, SOCK_RCVTSTAMP);
828 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
829 }
830}
831
832void sock_enable_timestamps(struct sock *sk)
833{
834 lock_sock(sk);
835 __sock_set_timestamps(sk, true, false, true);
836 release_sock(sk);
837}
838EXPORT_SYMBOL(sock_enable_timestamps);
839
840void sock_set_timestamp(struct sock *sk, int optname, bool valbool)
841{
842 switch (optname) {
843 case SO_TIMESTAMP_OLD:
844 __sock_set_timestamps(sk, valbool, false, false);
845 break;
846 case SO_TIMESTAMP_NEW:
847 __sock_set_timestamps(sk, valbool, true, false);
848 break;
849 case SO_TIMESTAMPNS_OLD:
850 __sock_set_timestamps(sk, valbool, false, true);
851 break;
852 case SO_TIMESTAMPNS_NEW:
853 __sock_set_timestamps(sk, valbool, true, true);
854 break;
855 }
856}
857
858static int sock_timestamping_bind_phc(struct sock *sk, int phc_index)
859{
860 struct net *net = sock_net(sk);
861 struct net_device *dev = NULL;
862 bool match = false;
863 int *vclock_index;
864 int i, num;
865
866 if (sk->sk_bound_dev_if)
867 dev = dev_get_by_index(net, sk->sk_bound_dev_if);
868
869 if (!dev) {
870 pr_err("%s: sock not bind to device\n", __func__);
871 return -EOPNOTSUPP;
872 }
873
874 num = ethtool_get_phc_vclocks(dev, &vclock_index);
875 dev_put(dev);
876
877 for (i = 0; i < num; i++) {
878 if (*(vclock_index + i) == phc_index) {
879 match = true;
880 break;
881 }
882 }
883
884 if (num > 0)
885 kfree(vclock_index);
886
887 if (!match)
888 return -EINVAL;
889
890 sk->sk_bind_phc = phc_index;
891
892 return 0;
893}
894
895int sock_set_timestamping(struct sock *sk, int optname,
896 struct so_timestamping timestamping)
897{
898 int val = timestamping.flags;
899 int ret;
900
901 if (val & ~SOF_TIMESTAMPING_MASK)
902 return -EINVAL;
903
904 if (val & SOF_TIMESTAMPING_OPT_ID_TCP &&
905 !(val & SOF_TIMESTAMPING_OPT_ID))
906 return -EINVAL;
907
908 if (val & SOF_TIMESTAMPING_OPT_ID &&
909 !(sk->sk_tsflags & SOF_TIMESTAMPING_OPT_ID)) {
910 if (sk_is_tcp(sk)) {
911 if ((1 << sk->sk_state) &
912 (TCPF_CLOSE | TCPF_LISTEN))
913 return -EINVAL;
914 if (val & SOF_TIMESTAMPING_OPT_ID_TCP)
915 atomic_set(&sk->sk_tskey, tcp_sk(sk)->write_seq);
916 else
917 atomic_set(&sk->sk_tskey, tcp_sk(sk)->snd_una);
918 } else {
919 atomic_set(&sk->sk_tskey, 0);
920 }
921 }
922
923 if (val & SOF_TIMESTAMPING_OPT_STATS &&
924 !(val & SOF_TIMESTAMPING_OPT_TSONLY))
925 return -EINVAL;
926
927 if (val & SOF_TIMESTAMPING_BIND_PHC) {
928 ret = sock_timestamping_bind_phc(sk, timestamping.bind_phc);
929 if (ret)
930 return ret;
931 }
932
933 sk->sk_tsflags = val;
934 sock_valbool_flag(sk, SOCK_TSTAMP_NEW, optname == SO_TIMESTAMPING_NEW);
935
936 if (val & SOF_TIMESTAMPING_RX_SOFTWARE)
937 sock_enable_timestamp(sk,
938 SOCK_TIMESTAMPING_RX_SOFTWARE);
939 else
940 sock_disable_timestamp(sk,
941 (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE));
942 return 0;
943}
944
945void sock_set_keepalive(struct sock *sk)
946{
947 lock_sock(sk);
948 if (sk->sk_prot->keepalive)
949 sk->sk_prot->keepalive(sk, true);
950 sock_valbool_flag(sk, SOCK_KEEPOPEN, true);
951 release_sock(sk);
952}
953EXPORT_SYMBOL(sock_set_keepalive);
954
955static void __sock_set_rcvbuf(struct sock *sk, int val)
956{
957 /* Ensure val * 2 fits into an int, to prevent max_t() from treating it
958 * as a negative value.
959 */
960 val = min_t(int, val, INT_MAX / 2);
961 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
962
963 /* We double it on the way in to account for "struct sk_buff" etc.
964 * overhead. Applications assume that the SO_RCVBUF setting they make
965 * will allow that much actual data to be received on that socket.
966 *
967 * Applications are unaware that "struct sk_buff" and other overheads
968 * allocate from the receive buffer during socket buffer allocation.
969 *
970 * And after considering the possible alternatives, returning the value
971 * we actually used in getsockopt is the most desirable behavior.
972 */
973 WRITE_ONCE(sk->sk_rcvbuf, max_t(int, val * 2, SOCK_MIN_RCVBUF));
974}
975
976void sock_set_rcvbuf(struct sock *sk, int val)
977{
978 lock_sock(sk);
979 __sock_set_rcvbuf(sk, val);
980 release_sock(sk);
981}
982EXPORT_SYMBOL(sock_set_rcvbuf);
983
984static void __sock_set_mark(struct sock *sk, u32 val)
985{
986 if (val != sk->sk_mark) {
987 sk->sk_mark = val;
988 sk_dst_reset(sk);
989 }
990}
991
992void sock_set_mark(struct sock *sk, u32 val)
993{
994 lock_sock(sk);
995 __sock_set_mark(sk, val);
996 release_sock(sk);
997}
998EXPORT_SYMBOL(sock_set_mark);
999
1000static void sock_release_reserved_memory(struct sock *sk, int bytes)
1001{
1002 /* Round down bytes to multiple of pages */
1003 bytes = round_down(bytes, PAGE_SIZE);
1004
1005 WARN_ON(bytes > sk->sk_reserved_mem);
1006 sk->sk_reserved_mem -= bytes;
1007 sk_mem_reclaim(sk);
1008}
1009
1010static int sock_reserve_memory(struct sock *sk, int bytes)
1011{
1012 long allocated;
1013 bool charged;
1014 int pages;
1015
1016 if (!mem_cgroup_sockets_enabled || !sk->sk_memcg || !sk_has_account(sk))
1017 return -EOPNOTSUPP;
1018
1019 if (!bytes)
1020 return 0;
1021
1022 pages = sk_mem_pages(bytes);
1023
1024 /* pre-charge to memcg */
1025 charged = mem_cgroup_charge_skmem(sk->sk_memcg, pages,
1026 GFP_KERNEL | __GFP_RETRY_MAYFAIL);
1027 if (!charged)
1028 return -ENOMEM;
1029
1030 /* pre-charge to forward_alloc */
1031 sk_memory_allocated_add(sk, pages);
1032 allocated = sk_memory_allocated(sk);
1033 /* If the system goes into memory pressure with this
1034 * precharge, give up and return error.
1035 */
1036 if (allocated > sk_prot_mem_limits(sk, 1)) {
1037 sk_memory_allocated_sub(sk, pages);
1038 mem_cgroup_uncharge_skmem(sk->sk_memcg, pages);
1039 return -ENOMEM;
1040 }
1041 sk->sk_forward_alloc += pages << PAGE_SHIFT;
1042
1043 sk->sk_reserved_mem += pages << PAGE_SHIFT;
1044
1045 return 0;
1046}
1047
1048void sockopt_lock_sock(struct sock *sk)
1049{
1050 /* When current->bpf_ctx is set, the setsockopt is called from
1051 * a bpf prog. bpf has ensured the sk lock has been
1052 * acquired before calling setsockopt().
1053 */
1054 if (has_current_bpf_ctx())
1055 return;
1056
1057 lock_sock(sk);
1058}
1059EXPORT_SYMBOL(sockopt_lock_sock);
1060
1061void sockopt_release_sock(struct sock *sk)
1062{
1063 if (has_current_bpf_ctx())
1064 return;
1065
1066 release_sock(sk);
1067}
1068EXPORT_SYMBOL(sockopt_release_sock);
1069
1070bool sockopt_ns_capable(struct user_namespace *ns, int cap)
1071{
1072 return has_current_bpf_ctx() || ns_capable(ns, cap);
1073}
1074EXPORT_SYMBOL(sockopt_ns_capable);
1075
1076bool sockopt_capable(int cap)
1077{
1078 return has_current_bpf_ctx() || capable(cap);
1079}
1080EXPORT_SYMBOL(sockopt_capable);
1081
1082/*
1083 * This is meant for all protocols to use and covers goings on
1084 * at the socket level. Everything here is generic.
1085 */
1086
1087int sk_setsockopt(struct sock *sk, int level, int optname,
1088 sockptr_t optval, unsigned int optlen)
1089{
1090 struct so_timestamping timestamping;
1091 struct socket *sock = sk->sk_socket;
1092 struct sock_txtime sk_txtime;
1093 int val;
1094 int valbool;
1095 struct linger ling;
1096 int ret = 0;
1097
1098 /*
1099 * Options without arguments
1100 */
1101
1102 if (optname == SO_BINDTODEVICE)
1103 return sock_setbindtodevice(sk, optval, optlen);
1104
1105 if (optlen < sizeof(int))
1106 return -EINVAL;
1107
1108 if (copy_from_sockptr(&val, optval, sizeof(val)))
1109 return -EFAULT;
1110
1111 valbool = val ? 1 : 0;
1112
1113 sockopt_lock_sock(sk);
1114
1115 switch (optname) {
1116 case SO_DEBUG:
1117 if (val && !sockopt_capable(CAP_NET_ADMIN))
1118 ret = -EACCES;
1119 else
1120 sock_valbool_flag(sk, SOCK_DBG, valbool);
1121 break;
1122 case SO_REUSEADDR:
1123 sk->sk_reuse = (valbool ? SK_CAN_REUSE : SK_NO_REUSE);
1124 break;
1125 case SO_REUSEPORT:
1126 sk->sk_reuseport = valbool;
1127 break;
1128 case SO_TYPE:
1129 case SO_PROTOCOL:
1130 case SO_DOMAIN:
1131 case SO_ERROR:
1132 ret = -ENOPROTOOPT;
1133 break;
1134 case SO_DONTROUTE:
1135 sock_valbool_flag(sk, SOCK_LOCALROUTE, valbool);
1136 sk_dst_reset(sk);
1137 break;
1138 case SO_BROADCAST:
1139 sock_valbool_flag(sk, SOCK_BROADCAST, valbool);
1140 break;
1141 case SO_SNDBUF:
1142 /* Don't error on this BSD doesn't and if you think
1143 * about it this is right. Otherwise apps have to
1144 * play 'guess the biggest size' games. RCVBUF/SNDBUF
1145 * are treated in BSD as hints
1146 */
1147 val = min_t(u32, val, READ_ONCE(sysctl_wmem_max));
1148set_sndbuf:
1149 /* Ensure val * 2 fits into an int, to prevent max_t()
1150 * from treating it as a negative value.
1151 */
1152 val = min_t(int, val, INT_MAX / 2);
1153 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
1154 WRITE_ONCE(sk->sk_sndbuf,
1155 max_t(int, val * 2, SOCK_MIN_SNDBUF));
1156 /* Wake up sending tasks if we upped the value. */
1157 sk->sk_write_space(sk);
1158 break;
1159
1160 case SO_SNDBUFFORCE:
1161 if (!sockopt_capable(CAP_NET_ADMIN)) {
1162 ret = -EPERM;
1163 break;
1164 }
1165
1166 /* No negative values (to prevent underflow, as val will be
1167 * multiplied by 2).
1168 */
1169 if (val < 0)
1170 val = 0;
1171 goto set_sndbuf;
1172
1173 case SO_RCVBUF:
1174 /* Don't error on this BSD doesn't and if you think
1175 * about it this is right. Otherwise apps have to
1176 * play 'guess the biggest size' games. RCVBUF/SNDBUF
1177 * are treated in BSD as hints
1178 */
1179 __sock_set_rcvbuf(sk, min_t(u32, val, READ_ONCE(sysctl_rmem_max)));
1180 break;
1181
1182 case SO_RCVBUFFORCE:
1183 if (!sockopt_capable(CAP_NET_ADMIN)) {
1184 ret = -EPERM;
1185 break;
1186 }
1187
1188 /* No negative values (to prevent underflow, as val will be
1189 * multiplied by 2).
1190 */
1191 __sock_set_rcvbuf(sk, max(val, 0));
1192 break;
1193
1194 case SO_KEEPALIVE:
1195 if (sk->sk_prot->keepalive)
1196 sk->sk_prot->keepalive(sk, valbool);
1197 sock_valbool_flag(sk, SOCK_KEEPOPEN, valbool);
1198 break;
1199
1200 case SO_OOBINLINE:
1201 sock_valbool_flag(sk, SOCK_URGINLINE, valbool);
1202 break;
1203
1204 case SO_NO_CHECK:
1205 sk->sk_no_check_tx = valbool;
1206 break;
1207
1208 case SO_PRIORITY:
1209 if ((val >= 0 && val <= 6) ||
1210 sockopt_ns_capable(sock_net(sk)->user_ns, CAP_NET_RAW) ||
1211 sockopt_ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
1212 sk->sk_priority = val;
1213 else
1214 ret = -EPERM;
1215 break;
1216
1217 case SO_LINGER:
1218 if (optlen < sizeof(ling)) {
1219 ret = -EINVAL; /* 1003.1g */
1220 break;
1221 }
1222 if (copy_from_sockptr(&ling, optval, sizeof(ling))) {
1223 ret = -EFAULT;
1224 break;
1225 }
1226 if (!ling.l_onoff)
1227 sock_reset_flag(sk, SOCK_LINGER);
1228 else {
1229#if (BITS_PER_LONG == 32)
1230 if ((unsigned int)ling.l_linger >= MAX_SCHEDULE_TIMEOUT/HZ)
1231 sk->sk_lingertime = MAX_SCHEDULE_TIMEOUT;
1232 else
1233#endif
1234 sk->sk_lingertime = (unsigned int)ling.l_linger * HZ;
1235 sock_set_flag(sk, SOCK_LINGER);
1236 }
1237 break;
1238
1239 case SO_BSDCOMPAT:
1240 break;
1241
1242 case SO_PASSCRED:
1243 if (valbool)
1244 set_bit(SOCK_PASSCRED, &sock->flags);
1245 else
1246 clear_bit(SOCK_PASSCRED, &sock->flags);
1247 break;
1248
1249 case SO_TIMESTAMP_OLD:
1250 case SO_TIMESTAMP_NEW:
1251 case SO_TIMESTAMPNS_OLD:
1252 case SO_TIMESTAMPNS_NEW:
1253 sock_set_timestamp(sk, optname, valbool);
1254 break;
1255
1256 case SO_TIMESTAMPING_NEW:
1257 case SO_TIMESTAMPING_OLD:
1258 if (optlen == sizeof(timestamping)) {
1259 if (copy_from_sockptr(×tamping, optval,
1260 sizeof(timestamping))) {
1261 ret = -EFAULT;
1262 break;
1263 }
1264 } else {
1265 memset(×tamping, 0, sizeof(timestamping));
1266 timestamping.flags = val;
1267 }
1268 ret = sock_set_timestamping(sk, optname, timestamping);
1269 break;
1270
1271 case SO_RCVLOWAT:
1272 if (val < 0)
1273 val = INT_MAX;
1274 if (sock && sock->ops->set_rcvlowat)
1275 ret = sock->ops->set_rcvlowat(sk, val);
1276 else
1277 WRITE_ONCE(sk->sk_rcvlowat, val ? : 1);
1278 break;
1279
1280 case SO_RCVTIMEO_OLD:
1281 case SO_RCVTIMEO_NEW:
1282 ret = sock_set_timeout(&sk->sk_rcvtimeo, optval,
1283 optlen, optname == SO_RCVTIMEO_OLD);
1284 break;
1285
1286 case SO_SNDTIMEO_OLD:
1287 case SO_SNDTIMEO_NEW:
1288 ret = sock_set_timeout(&sk->sk_sndtimeo, optval,
1289 optlen, optname == SO_SNDTIMEO_OLD);
1290 break;
1291
1292 case SO_ATTACH_FILTER: {
1293 struct sock_fprog fprog;
1294
1295 ret = copy_bpf_fprog_from_user(&fprog, optval, optlen);
1296 if (!ret)
1297 ret = sk_attach_filter(&fprog, sk);
1298 break;
1299 }
1300 case SO_ATTACH_BPF:
1301 ret = -EINVAL;
1302 if (optlen == sizeof(u32)) {
1303 u32 ufd;
1304
1305 ret = -EFAULT;
1306 if (copy_from_sockptr(&ufd, optval, sizeof(ufd)))
1307 break;
1308
1309 ret = sk_attach_bpf(ufd, sk);
1310 }
1311 break;
1312
1313 case SO_ATTACH_REUSEPORT_CBPF: {
1314 struct sock_fprog fprog;
1315
1316 ret = copy_bpf_fprog_from_user(&fprog, optval, optlen);
1317 if (!ret)
1318 ret = sk_reuseport_attach_filter(&fprog, sk);
1319 break;
1320 }
1321 case SO_ATTACH_REUSEPORT_EBPF:
1322 ret = -EINVAL;
1323 if (optlen == sizeof(u32)) {
1324 u32 ufd;
1325
1326 ret = -EFAULT;
1327 if (copy_from_sockptr(&ufd, optval, sizeof(ufd)))
1328 break;
1329
1330 ret = sk_reuseport_attach_bpf(ufd, sk);
1331 }
1332 break;
1333
1334 case SO_DETACH_REUSEPORT_BPF:
1335 ret = reuseport_detach_prog(sk);
1336 break;
1337
1338 case SO_DETACH_FILTER:
1339 ret = sk_detach_filter(sk);
1340 break;
1341
1342 case SO_LOCK_FILTER:
1343 if (sock_flag(sk, SOCK_FILTER_LOCKED) && !valbool)
1344 ret = -EPERM;
1345 else
1346 sock_valbool_flag(sk, SOCK_FILTER_LOCKED, valbool);
1347 break;
1348
1349 case SO_PASSSEC:
1350 if (valbool)
1351 set_bit(SOCK_PASSSEC, &sock->flags);
1352 else
1353 clear_bit(SOCK_PASSSEC, &sock->flags);
1354 break;
1355 case SO_MARK:
1356 if (!sockopt_ns_capable(sock_net(sk)->user_ns, CAP_NET_RAW) &&
1357 !sockopt_ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) {
1358 ret = -EPERM;
1359 break;
1360 }
1361
1362 __sock_set_mark(sk, val);
1363 break;
1364 case SO_RCVMARK:
1365 if (!sockopt_ns_capable(sock_net(sk)->user_ns, CAP_NET_RAW) &&
1366 !sockopt_ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) {
1367 ret = -EPERM;
1368 break;
1369 }
1370
1371 sock_valbool_flag(sk, SOCK_RCVMARK, valbool);
1372 break;
1373
1374 case SO_RXQ_OVFL:
1375 sock_valbool_flag(sk, SOCK_RXQ_OVFL, valbool);
1376 break;
1377
1378 case SO_WIFI_STATUS:
1379 sock_valbool_flag(sk, SOCK_WIFI_STATUS, valbool);
1380 break;
1381
1382 case SO_PEEK_OFF:
1383 if (sock->ops->set_peek_off)
1384 ret = sock->ops->set_peek_off(sk, val);
1385 else
1386 ret = -EOPNOTSUPP;
1387 break;
1388
1389 case SO_NOFCS:
1390 sock_valbool_flag(sk, SOCK_NOFCS, valbool);
1391 break;
1392
1393 case SO_SELECT_ERR_QUEUE:
1394 sock_valbool_flag(sk, SOCK_SELECT_ERR_QUEUE, valbool);
1395 break;
1396
1397#ifdef CONFIG_NET_RX_BUSY_POLL
1398 case SO_BUSY_POLL:
1399 /* allow unprivileged users to decrease the value */
1400 if ((val > sk->sk_ll_usec) && !sockopt_capable(CAP_NET_ADMIN))
1401 ret = -EPERM;
1402 else {
1403 if (val < 0)
1404 ret = -EINVAL;
1405 else
1406 WRITE_ONCE(sk->sk_ll_usec, val);
1407 }
1408 break;
1409 case SO_PREFER_BUSY_POLL:
1410 if (valbool && !sockopt_capable(CAP_NET_ADMIN))
1411 ret = -EPERM;
1412 else
1413 WRITE_ONCE(sk->sk_prefer_busy_poll, valbool);
1414 break;
1415 case SO_BUSY_POLL_BUDGET:
1416 if (val > READ_ONCE(sk->sk_busy_poll_budget) && !sockopt_capable(CAP_NET_ADMIN)) {
1417 ret = -EPERM;
1418 } else {
1419 if (val < 0 || val > U16_MAX)
1420 ret = -EINVAL;
1421 else
1422 WRITE_ONCE(sk->sk_busy_poll_budget, val);
1423 }
1424 break;
1425#endif
1426
1427 case SO_MAX_PACING_RATE:
1428 {
1429 unsigned long ulval = (val == ~0U) ? ~0UL : (unsigned int)val;
1430
1431 if (sizeof(ulval) != sizeof(val) &&
1432 optlen >= sizeof(ulval) &&
1433 copy_from_sockptr(&ulval, optval, sizeof(ulval))) {
1434 ret = -EFAULT;
1435 break;
1436 }
1437 if (ulval != ~0UL)
1438 cmpxchg(&sk->sk_pacing_status,
1439 SK_PACING_NONE,
1440 SK_PACING_NEEDED);
1441 sk->sk_max_pacing_rate = ulval;
1442 sk->sk_pacing_rate = min(sk->sk_pacing_rate, ulval);
1443 break;
1444 }
1445 case SO_INCOMING_CPU:
1446 reuseport_update_incoming_cpu(sk, val);
1447 break;
1448
1449 case SO_CNX_ADVICE:
1450 if (val == 1)
1451 dst_negative_advice(sk);
1452 break;
1453
1454 case SO_ZEROCOPY:
1455 if (sk->sk_family == PF_INET || sk->sk_family == PF_INET6) {
1456 if (!(sk_is_tcp(sk) ||
1457 (sk->sk_type == SOCK_DGRAM &&
1458 sk->sk_protocol == IPPROTO_UDP)))
1459 ret = -EOPNOTSUPP;
1460 } else if (sk->sk_family != PF_RDS) {
1461 ret = -EOPNOTSUPP;
1462 }
1463 if (!ret) {
1464 if (val < 0 || val > 1)
1465 ret = -EINVAL;
1466 else
1467 sock_valbool_flag(sk, SOCK_ZEROCOPY, valbool);
1468 }
1469 break;
1470
1471 case SO_TXTIME:
1472 if (optlen != sizeof(struct sock_txtime)) {
1473 ret = -EINVAL;
1474 break;
1475 } else if (copy_from_sockptr(&sk_txtime, optval,
1476 sizeof(struct sock_txtime))) {
1477 ret = -EFAULT;
1478 break;
1479 } else if (sk_txtime.flags & ~SOF_TXTIME_FLAGS_MASK) {
1480 ret = -EINVAL;
1481 break;
1482 }
1483 /* CLOCK_MONOTONIC is only used by sch_fq, and this packet
1484 * scheduler has enough safe guards.
1485 */
1486 if (sk_txtime.clockid != CLOCK_MONOTONIC &&
1487 !sockopt_ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) {
1488 ret = -EPERM;
1489 break;
1490 }
1491 sock_valbool_flag(sk, SOCK_TXTIME, true);
1492 sk->sk_clockid = sk_txtime.clockid;
1493 sk->sk_txtime_deadline_mode =
1494 !!(sk_txtime.flags & SOF_TXTIME_DEADLINE_MODE);
1495 sk->sk_txtime_report_errors =
1496 !!(sk_txtime.flags & SOF_TXTIME_REPORT_ERRORS);
1497 break;
1498
1499 case SO_BINDTOIFINDEX:
1500 ret = sock_bindtoindex_locked(sk, val);
1501 break;
1502
1503 case SO_BUF_LOCK:
1504 if (val & ~SOCK_BUF_LOCK_MASK) {
1505 ret = -EINVAL;
1506 break;
1507 }
1508 sk->sk_userlocks = val | (sk->sk_userlocks &
1509 ~SOCK_BUF_LOCK_MASK);
1510 break;
1511
1512 case SO_RESERVE_MEM:
1513 {
1514 int delta;
1515
1516 if (val < 0) {
1517 ret = -EINVAL;
1518 break;
1519 }
1520
1521 delta = val - sk->sk_reserved_mem;
1522 if (delta < 0)
1523 sock_release_reserved_memory(sk, -delta);
1524 else
1525 ret = sock_reserve_memory(sk, delta);
1526 break;
1527 }
1528
1529 case SO_TXREHASH:
1530 if (val < -1 || val > 1) {
1531 ret = -EINVAL;
1532 break;
1533 }
1534 if ((u8)val == SOCK_TXREHASH_DEFAULT)
1535 val = READ_ONCE(sock_net(sk)->core.sysctl_txrehash);
1536 /* Paired with READ_ONCE() in tcp_rtx_synack() */
1537 WRITE_ONCE(sk->sk_txrehash, (u8)val);
1538 break;
1539
1540 default:
1541 ret = -ENOPROTOOPT;
1542 break;
1543 }
1544 sockopt_release_sock(sk);
1545 return ret;
1546}
1547
1548int sock_setsockopt(struct socket *sock, int level, int optname,
1549 sockptr_t optval, unsigned int optlen)
1550{
1551 return sk_setsockopt(sock->sk, level, optname,
1552 optval, optlen);
1553}
1554EXPORT_SYMBOL(sock_setsockopt);
1555
1556static const struct cred *sk_get_peer_cred(struct sock *sk)
1557{
1558 const struct cred *cred;
1559
1560 spin_lock(&sk->sk_peer_lock);
1561 cred = get_cred(sk->sk_peer_cred);
1562 spin_unlock(&sk->sk_peer_lock);
1563
1564 return cred;
1565}
1566
1567static void cred_to_ucred(struct pid *pid, const struct cred *cred,
1568 struct ucred *ucred)
1569{
1570 ucred->pid = pid_vnr(pid);
1571 ucred->uid = ucred->gid = -1;
1572 if (cred) {
1573 struct user_namespace *current_ns = current_user_ns();
1574
1575 ucred->uid = from_kuid_munged(current_ns, cred->euid);
1576 ucred->gid = from_kgid_munged(current_ns, cred->egid);
1577 }
1578}
1579
1580static int groups_to_user(sockptr_t dst, const struct group_info *src)
1581{
1582 struct user_namespace *user_ns = current_user_ns();
1583 int i;
1584
1585 for (i = 0; i < src->ngroups; i++) {
1586 gid_t gid = from_kgid_munged(user_ns, src->gid[i]);
1587
1588 if (copy_to_sockptr_offset(dst, i * sizeof(gid), &gid, sizeof(gid)))
1589 return -EFAULT;
1590 }
1591
1592 return 0;
1593}
1594
1595int sk_getsockopt(struct sock *sk, int level, int optname,
1596 sockptr_t optval, sockptr_t optlen)
1597{
1598 struct socket *sock = sk->sk_socket;
1599
1600 union {
1601 int val;
1602 u64 val64;
1603 unsigned long ulval;
1604 struct linger ling;
1605 struct old_timeval32 tm32;
1606 struct __kernel_old_timeval tm;
1607 struct __kernel_sock_timeval stm;
1608 struct sock_txtime txtime;
1609 struct so_timestamping timestamping;
1610 } v;
1611
1612 int lv = sizeof(int);
1613 int len;
1614
1615 if (copy_from_sockptr(&len, optlen, sizeof(int)))
1616 return -EFAULT;
1617 if (len < 0)
1618 return -EINVAL;
1619
1620 memset(&v, 0, sizeof(v));
1621
1622 switch (optname) {
1623 case SO_DEBUG:
1624 v.val = sock_flag(sk, SOCK_DBG);
1625 break;
1626
1627 case SO_DONTROUTE:
1628 v.val = sock_flag(sk, SOCK_LOCALROUTE);
1629 break;
1630
1631 case SO_BROADCAST:
1632 v.val = sock_flag(sk, SOCK_BROADCAST);
1633 break;
1634
1635 case SO_SNDBUF:
1636 v.val = sk->sk_sndbuf;
1637 break;
1638
1639 case SO_RCVBUF:
1640 v.val = sk->sk_rcvbuf;
1641 break;
1642
1643 case SO_REUSEADDR:
1644 v.val = sk->sk_reuse;
1645 break;
1646
1647 case SO_REUSEPORT:
1648 v.val = sk->sk_reuseport;
1649 break;
1650
1651 case SO_KEEPALIVE:
1652 v.val = sock_flag(sk, SOCK_KEEPOPEN);
1653 break;
1654
1655 case SO_TYPE:
1656 v.val = sk->sk_type;
1657 break;
1658
1659 case SO_PROTOCOL:
1660 v.val = sk->sk_protocol;
1661 break;
1662
1663 case SO_DOMAIN:
1664 v.val = sk->sk_family;
1665 break;
1666
1667 case SO_ERROR:
1668 v.val = -sock_error(sk);
1669 if (v.val == 0)
1670 v.val = xchg(&sk->sk_err_soft, 0);
1671 break;
1672
1673 case SO_OOBINLINE:
1674 v.val = sock_flag(sk, SOCK_URGINLINE);
1675 break;
1676
1677 case SO_NO_CHECK:
1678 v.val = sk->sk_no_check_tx;
1679 break;
1680
1681 case SO_PRIORITY:
1682 v.val = sk->sk_priority;
1683 break;
1684
1685 case SO_LINGER:
1686 lv = sizeof(v.ling);
1687 v.ling.l_onoff = sock_flag(sk, SOCK_LINGER);
1688 v.ling.l_linger = sk->sk_lingertime / HZ;
1689 break;
1690
1691 case SO_BSDCOMPAT:
1692 break;
1693
1694 case SO_TIMESTAMP_OLD:
1695 v.val = sock_flag(sk, SOCK_RCVTSTAMP) &&
1696 !sock_flag(sk, SOCK_TSTAMP_NEW) &&
1697 !sock_flag(sk, SOCK_RCVTSTAMPNS);
1698 break;
1699
1700 case SO_TIMESTAMPNS_OLD:
1701 v.val = sock_flag(sk, SOCK_RCVTSTAMPNS) && !sock_flag(sk, SOCK_TSTAMP_NEW);
1702 break;
1703
1704 case SO_TIMESTAMP_NEW:
1705 v.val = sock_flag(sk, SOCK_RCVTSTAMP) && sock_flag(sk, SOCK_TSTAMP_NEW);
1706 break;
1707
1708 case SO_TIMESTAMPNS_NEW:
1709 v.val = sock_flag(sk, SOCK_RCVTSTAMPNS) && sock_flag(sk, SOCK_TSTAMP_NEW);
1710 break;
1711
1712 case SO_TIMESTAMPING_OLD:
1713 lv = sizeof(v.timestamping);
1714 v.timestamping.flags = sk->sk_tsflags;
1715 v.timestamping.bind_phc = sk->sk_bind_phc;
1716 break;
1717
1718 case SO_RCVTIMEO_OLD:
1719 case SO_RCVTIMEO_NEW:
1720 lv = sock_get_timeout(sk->sk_rcvtimeo, &v, SO_RCVTIMEO_OLD == optname);
1721 break;
1722
1723 case SO_SNDTIMEO_OLD:
1724 case SO_SNDTIMEO_NEW:
1725 lv = sock_get_timeout(sk->sk_sndtimeo, &v, SO_SNDTIMEO_OLD == optname);
1726 break;
1727
1728 case SO_RCVLOWAT:
1729 v.val = sk->sk_rcvlowat;
1730 break;
1731
1732 case SO_SNDLOWAT:
1733 v.val = 1;
1734 break;
1735
1736 case SO_PASSCRED:
1737 v.val = !!test_bit(SOCK_PASSCRED, &sock->flags);
1738 break;
1739
1740 case SO_PEERCRED:
1741 {
1742 struct ucred peercred;
1743 if (len > sizeof(peercred))
1744 len = sizeof(peercred);
1745
1746 spin_lock(&sk->sk_peer_lock);
1747 cred_to_ucred(sk->sk_peer_pid, sk->sk_peer_cred, &peercred);
1748 spin_unlock(&sk->sk_peer_lock);
1749
1750 if (copy_to_sockptr(optval, &peercred, len))
1751 return -EFAULT;
1752 goto lenout;
1753 }
1754
1755 case SO_PEERGROUPS:
1756 {
1757 const struct cred *cred;
1758 int ret, n;
1759
1760 cred = sk_get_peer_cred(sk);
1761 if (!cred)
1762 return -ENODATA;
1763
1764 n = cred->group_info->ngroups;
1765 if (len < n * sizeof(gid_t)) {
1766 len = n * sizeof(gid_t);
1767 put_cred(cred);
1768 return copy_to_sockptr(optlen, &len, sizeof(int)) ? -EFAULT : -ERANGE;
1769 }
1770 len = n * sizeof(gid_t);
1771
1772 ret = groups_to_user(optval, cred->group_info);
1773 put_cred(cred);
1774 if (ret)
1775 return ret;
1776 goto lenout;
1777 }
1778
1779 case SO_PEERNAME:
1780 {
1781 char address[128];
1782
1783 lv = sock->ops->getname(sock, (struct sockaddr *)address, 2);
1784 if (lv < 0)
1785 return -ENOTCONN;
1786 if (lv < len)
1787 return -EINVAL;
1788 if (copy_to_sockptr(optval, address, len))
1789 return -EFAULT;
1790 goto lenout;
1791 }
1792
1793 /* Dubious BSD thing... Probably nobody even uses it, but
1794 * the UNIX standard wants it for whatever reason... -DaveM
1795 */
1796 case SO_ACCEPTCONN:
1797 v.val = sk->sk_state == TCP_LISTEN;
1798 break;
1799
1800 case SO_PASSSEC:
1801 v.val = !!test_bit(SOCK_PASSSEC, &sock->flags);
1802 break;
1803
1804 case SO_PEERSEC:
1805 return security_socket_getpeersec_stream(sock,
1806 optval, optlen, len);
1807
1808 case SO_MARK:
1809 v.val = sk->sk_mark;
1810 break;
1811
1812 case SO_RCVMARK:
1813 v.val = sock_flag(sk, SOCK_RCVMARK);
1814 break;
1815
1816 case SO_RXQ_OVFL:
1817 v.val = sock_flag(sk, SOCK_RXQ_OVFL);
1818 break;
1819
1820 case SO_WIFI_STATUS:
1821 v.val = sock_flag(sk, SOCK_WIFI_STATUS);
1822 break;
1823
1824 case SO_PEEK_OFF:
1825 if (!sock->ops->set_peek_off)
1826 return -EOPNOTSUPP;
1827
1828 v.val = sk->sk_peek_off;
1829 break;
1830 case SO_NOFCS:
1831 v.val = sock_flag(sk, SOCK_NOFCS);
1832 break;
1833
1834 case SO_BINDTODEVICE:
1835 return sock_getbindtodevice(sk, optval, optlen, len);
1836
1837 case SO_GET_FILTER:
1838 len = sk_get_filter(sk, optval, len);
1839 if (len < 0)
1840 return len;
1841
1842 goto lenout;
1843
1844 case SO_LOCK_FILTER:
1845 v.val = sock_flag(sk, SOCK_FILTER_LOCKED);
1846 break;
1847
1848 case SO_BPF_EXTENSIONS:
1849 v.val = bpf_tell_extensions();
1850 break;
1851
1852 case SO_SELECT_ERR_QUEUE:
1853 v.val = sock_flag(sk, SOCK_SELECT_ERR_QUEUE);
1854 break;
1855
1856#ifdef CONFIG_NET_RX_BUSY_POLL
1857 case SO_BUSY_POLL:
1858 v.val = sk->sk_ll_usec;
1859 break;
1860 case SO_PREFER_BUSY_POLL:
1861 v.val = READ_ONCE(sk->sk_prefer_busy_poll);
1862 break;
1863#endif
1864
1865 case SO_MAX_PACING_RATE:
1866 if (sizeof(v.ulval) != sizeof(v.val) && len >= sizeof(v.ulval)) {
1867 lv = sizeof(v.ulval);
1868 v.ulval = sk->sk_max_pacing_rate;
1869 } else {
1870 /* 32bit version */
1871 v.val = min_t(unsigned long, sk->sk_max_pacing_rate, ~0U);
1872 }
1873 break;
1874
1875 case SO_INCOMING_CPU:
1876 v.val = READ_ONCE(sk->sk_incoming_cpu);
1877 break;
1878
1879 case SO_MEMINFO:
1880 {
1881 u32 meminfo[SK_MEMINFO_VARS];
1882
1883 sk_get_meminfo(sk, meminfo);
1884
1885 len = min_t(unsigned int, len, sizeof(meminfo));
1886 if (copy_to_sockptr(optval, &meminfo, len))
1887 return -EFAULT;
1888
1889 goto lenout;
1890 }
1891
1892#ifdef CONFIG_NET_RX_BUSY_POLL
1893 case SO_INCOMING_NAPI_ID:
1894 v.val = READ_ONCE(sk->sk_napi_id);
1895
1896 /* aggregate non-NAPI IDs down to 0 */
1897 if (v.val < MIN_NAPI_ID)
1898 v.val = 0;
1899
1900 break;
1901#endif
1902
1903 case SO_COOKIE:
1904 lv = sizeof(u64);
1905 if (len < lv)
1906 return -EINVAL;
1907 v.val64 = sock_gen_cookie(sk);
1908 break;
1909
1910 case SO_ZEROCOPY:
1911 v.val = sock_flag(sk, SOCK_ZEROCOPY);
1912 break;
1913
1914 case SO_TXTIME:
1915 lv = sizeof(v.txtime);
1916 v.txtime.clockid = sk->sk_clockid;
1917 v.txtime.flags |= sk->sk_txtime_deadline_mode ?
1918 SOF_TXTIME_DEADLINE_MODE : 0;
1919 v.txtime.flags |= sk->sk_txtime_report_errors ?
1920 SOF_TXTIME_REPORT_ERRORS : 0;
1921 break;
1922
1923 case SO_BINDTOIFINDEX:
1924 v.val = READ_ONCE(sk->sk_bound_dev_if);
1925 break;
1926
1927 case SO_NETNS_COOKIE:
1928 lv = sizeof(u64);
1929 if (len != lv)
1930 return -EINVAL;
1931 v.val64 = sock_net(sk)->net_cookie;
1932 break;
1933
1934 case SO_BUF_LOCK:
1935 v.val = sk->sk_userlocks & SOCK_BUF_LOCK_MASK;
1936 break;
1937
1938 case SO_RESERVE_MEM:
1939 v.val = sk->sk_reserved_mem;
1940 break;
1941
1942 case SO_TXREHASH:
1943 v.val = sk->sk_txrehash;
1944 break;
1945
1946 default:
1947 /* We implement the SO_SNDLOWAT etc to not be settable
1948 * (1003.1g 7).
1949 */
1950 return -ENOPROTOOPT;
1951 }
1952
1953 if (len > lv)
1954 len = lv;
1955 if (copy_to_sockptr(optval, &v, len))
1956 return -EFAULT;
1957lenout:
1958 if (copy_to_sockptr(optlen, &len, sizeof(int)))
1959 return -EFAULT;
1960 return 0;
1961}
1962
1963int sock_getsockopt(struct socket *sock, int level, int optname,
1964 char __user *optval, int __user *optlen)
1965{
1966 return sk_getsockopt(sock->sk, level, optname,
1967 USER_SOCKPTR(optval),
1968 USER_SOCKPTR(optlen));
1969}
1970
1971/*
1972 * Initialize an sk_lock.
1973 *
1974 * (We also register the sk_lock with the lock validator.)
1975 */
1976static inline void sock_lock_init(struct sock *sk)
1977{
1978 if (sk->sk_kern_sock)
1979 sock_lock_init_class_and_name(
1980 sk,
1981 af_family_kern_slock_key_strings[sk->sk_family],
1982 af_family_kern_slock_keys + sk->sk_family,
1983 af_family_kern_key_strings[sk->sk_family],
1984 af_family_kern_keys + sk->sk_family);
1985 else
1986 sock_lock_init_class_and_name(
1987 sk,
1988 af_family_slock_key_strings[sk->sk_family],
1989 af_family_slock_keys + sk->sk_family,
1990 af_family_key_strings[sk->sk_family],
1991 af_family_keys + sk->sk_family);
1992}
1993
1994/*
1995 * Copy all fields from osk to nsk but nsk->sk_refcnt must not change yet,
1996 * even temporarly, because of RCU lookups. sk_node should also be left as is.
1997 * We must not copy fields between sk_dontcopy_begin and sk_dontcopy_end
1998 */
1999static void sock_copy(struct sock *nsk, const struct sock *osk)
2000{
2001 const struct proto *prot = READ_ONCE(osk->sk_prot);
2002#ifdef CONFIG_SECURITY_NETWORK
2003 void *sptr = nsk->sk_security;
2004#endif
2005
2006 /* If we move sk_tx_queue_mapping out of the private section,
2007 * we must check if sk_tx_queue_clear() is called after
2008 * sock_copy() in sk_clone_lock().
2009 */
2010 BUILD_BUG_ON(offsetof(struct sock, sk_tx_queue_mapping) <
2011 offsetof(struct sock, sk_dontcopy_begin) ||
2012 offsetof(struct sock, sk_tx_queue_mapping) >=
2013 offsetof(struct sock, sk_dontcopy_end));
2014
2015 memcpy(nsk, osk, offsetof(struct sock, sk_dontcopy_begin));
2016
2017 memcpy(&nsk->sk_dontcopy_end, &osk->sk_dontcopy_end,
2018 prot->obj_size - offsetof(struct sock, sk_dontcopy_end));
2019
2020#ifdef CONFIG_SECURITY_NETWORK
2021 nsk->sk_security = sptr;
2022 security_sk_clone(osk, nsk);
2023#endif
2024}
2025
2026static struct sock *sk_prot_alloc(struct proto *prot, gfp_t priority,
2027 int family)
2028{
2029 struct sock *sk;
2030 struct kmem_cache *slab;
2031
2032 slab = prot->slab;
2033 if (slab != NULL) {
2034 sk = kmem_cache_alloc(slab, priority & ~__GFP_ZERO);
2035 if (!sk)
2036 return sk;
2037 if (want_init_on_alloc(priority))
2038 sk_prot_clear_nulls(sk, prot->obj_size);
2039 } else
2040 sk = kmalloc(prot->obj_size, priority);
2041
2042 if (sk != NULL) {
2043 if (security_sk_alloc(sk, family, priority))
2044 goto out_free;
2045
2046 if (!try_module_get(prot->owner))
2047 goto out_free_sec;
2048 }
2049
2050 return sk;
2051
2052out_free_sec:
2053 security_sk_free(sk);
2054out_free:
2055 if (slab != NULL)
2056 kmem_cache_free(slab, sk);
2057 else
2058 kfree(sk);
2059 return NULL;
2060}
2061
2062static void sk_prot_free(struct proto *prot, struct sock *sk)
2063{
2064 struct kmem_cache *slab;
2065 struct module *owner;
2066
2067 owner = prot->owner;
2068 slab = prot->slab;
2069
2070 cgroup_sk_free(&sk->sk_cgrp_data);
2071 mem_cgroup_sk_free(sk);
2072 security_sk_free(sk);
2073 if (slab != NULL)
2074 kmem_cache_free(slab, sk);
2075 else
2076 kfree(sk);
2077 module_put(owner);
2078}
2079
2080/**
2081 * sk_alloc - All socket objects are allocated here
2082 * @net: the applicable net namespace
2083 * @family: protocol family
2084 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
2085 * @prot: struct proto associated with this new sock instance
2086 * @kern: is this to be a kernel socket?
2087 */
2088struct sock *sk_alloc(struct net *net, int family, gfp_t priority,
2089 struct proto *prot, int kern)
2090{
2091 struct sock *sk;
2092
2093 sk = sk_prot_alloc(prot, priority | __GFP_ZERO, family);
2094 if (sk) {
2095 sk->sk_family = family;
2096 /*
2097 * See comment in struct sock definition to understand
2098 * why we need sk_prot_creator -acme
2099 */
2100 sk->sk_prot = sk->sk_prot_creator = prot;
2101 sk->sk_kern_sock = kern;
2102 sock_lock_init(sk);
2103 sk->sk_net_refcnt = kern ? 0 : 1;
2104 if (likely(sk->sk_net_refcnt)) {
2105 get_net_track(net, &sk->ns_tracker, priority);
2106 sock_inuse_add(net, 1);
2107 } else {
2108 __netns_tracker_alloc(net, &sk->ns_tracker,
2109 false, priority);
2110 }
2111
2112 sock_net_set(sk, net);
2113 refcount_set(&sk->sk_wmem_alloc, 1);
2114
2115 mem_cgroup_sk_alloc(sk);
2116 cgroup_sk_alloc(&sk->sk_cgrp_data);
2117 sock_update_classid(&sk->sk_cgrp_data);
2118 sock_update_netprioidx(&sk->sk_cgrp_data);
2119 sk_tx_queue_clear(sk);
2120 }
2121
2122 return sk;
2123}
2124EXPORT_SYMBOL(sk_alloc);
2125
2126/* Sockets having SOCK_RCU_FREE will call this function after one RCU
2127 * grace period. This is the case for UDP sockets and TCP listeners.
2128 */
2129static void __sk_destruct(struct rcu_head *head)
2130{
2131 struct sock *sk = container_of(head, struct sock, sk_rcu);
2132 struct sk_filter *filter;
2133
2134 if (sk->sk_destruct)
2135 sk->sk_destruct(sk);
2136
2137 filter = rcu_dereference_check(sk->sk_filter,
2138 refcount_read(&sk->sk_wmem_alloc) == 0);
2139 if (filter) {
2140 sk_filter_uncharge(sk, filter);
2141 RCU_INIT_POINTER(sk->sk_filter, NULL);
2142 }
2143
2144 sock_disable_timestamp(sk, SK_FLAGS_TIMESTAMP);
2145
2146#ifdef CONFIG_BPF_SYSCALL
2147 bpf_sk_storage_free(sk);
2148#endif
2149
2150 if (atomic_read(&sk->sk_omem_alloc))
2151 pr_debug("%s: optmem leakage (%d bytes) detected\n",
2152 __func__, atomic_read(&sk->sk_omem_alloc));
2153
2154 if (sk->sk_frag.page) {
2155 put_page(sk->sk_frag.page);
2156 sk->sk_frag.page = NULL;
2157 }
2158
2159 /* We do not need to acquire sk->sk_peer_lock, we are the last user. */
2160 put_cred(sk->sk_peer_cred);
2161 put_pid(sk->sk_peer_pid);
2162
2163 if (likely(sk->sk_net_refcnt))
2164 put_net_track(sock_net(sk), &sk->ns_tracker);
2165 else
2166 __netns_tracker_free(sock_net(sk), &sk->ns_tracker, false);
2167
2168 sk_prot_free(sk->sk_prot_creator, sk);
2169}
2170
2171void sk_destruct(struct sock *sk)
2172{
2173 bool use_call_rcu = sock_flag(sk, SOCK_RCU_FREE);
2174
2175 if (rcu_access_pointer(sk->sk_reuseport_cb)) {
2176 reuseport_detach_sock(sk);
2177 use_call_rcu = true;
2178 }
2179
2180 if (use_call_rcu)
2181 call_rcu(&sk->sk_rcu, __sk_destruct);
2182 else
2183 __sk_destruct(&sk->sk_rcu);
2184}
2185
2186static void __sk_free(struct sock *sk)
2187{
2188 if (likely(sk->sk_net_refcnt))
2189 sock_inuse_add(sock_net(sk), -1);
2190
2191 if (unlikely(sk->sk_net_refcnt && sock_diag_has_destroy_listeners(sk)))
2192 sock_diag_broadcast_destroy(sk);
2193 else
2194 sk_destruct(sk);
2195}
2196
2197void sk_free(struct sock *sk)
2198{
2199 /*
2200 * We subtract one from sk_wmem_alloc and can know if
2201 * some packets are still in some tx queue.
2202 * If not null, sock_wfree() will call __sk_free(sk) later
2203 */
2204 if (refcount_dec_and_test(&sk->sk_wmem_alloc))
2205 __sk_free(sk);
2206}
2207EXPORT_SYMBOL(sk_free);
2208
2209static void sk_init_common(struct sock *sk)
2210{
2211 skb_queue_head_init(&sk->sk_receive_queue);
2212 skb_queue_head_init(&sk->sk_write_queue);
2213 skb_queue_head_init(&sk->sk_error_queue);
2214
2215 rwlock_init(&sk->sk_callback_lock);
2216 lockdep_set_class_and_name(&sk->sk_receive_queue.lock,
2217 af_rlock_keys + sk->sk_family,
2218 af_family_rlock_key_strings[sk->sk_family]);
2219 lockdep_set_class_and_name(&sk->sk_write_queue.lock,
2220 af_wlock_keys + sk->sk_family,
2221 af_family_wlock_key_strings[sk->sk_family]);
2222 lockdep_set_class_and_name(&sk->sk_error_queue.lock,
2223 af_elock_keys + sk->sk_family,
2224 af_family_elock_key_strings[sk->sk_family]);
2225 lockdep_set_class_and_name(&sk->sk_callback_lock,
2226 af_callback_keys + sk->sk_family,
2227 af_family_clock_key_strings[sk->sk_family]);
2228}
2229
2230/**
2231 * sk_clone_lock - clone a socket, and lock its clone
2232 * @sk: the socket to clone
2233 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
2234 *
2235 * Caller must unlock socket even in error path (bh_unlock_sock(newsk))
2236 */
2237struct sock *sk_clone_lock(const struct sock *sk, const gfp_t priority)
2238{
2239 struct proto *prot = READ_ONCE(sk->sk_prot);
2240 struct sk_filter *filter;
2241 bool is_charged = true;
2242 struct sock *newsk;
2243
2244 newsk = sk_prot_alloc(prot, priority, sk->sk_family);
2245 if (!newsk)
2246 goto out;
2247
2248 sock_copy(newsk, sk);
2249
2250 newsk->sk_prot_creator = prot;
2251
2252 /* SANITY */
2253 if (likely(newsk->sk_net_refcnt)) {
2254 get_net_track(sock_net(newsk), &newsk->ns_tracker, priority);
2255 sock_inuse_add(sock_net(newsk), 1);
2256 } else {
2257 /* Kernel sockets are not elevating the struct net refcount.
2258 * Instead, use a tracker to more easily detect if a layer
2259 * is not properly dismantling its kernel sockets at netns
2260 * destroy time.
2261 */
2262 __netns_tracker_alloc(sock_net(newsk), &newsk->ns_tracker,
2263 false, priority);
2264 }
2265 sk_node_init(&newsk->sk_node);
2266 sock_lock_init(newsk);
2267 bh_lock_sock(newsk);
2268 newsk->sk_backlog.head = newsk->sk_backlog.tail = NULL;
2269 newsk->sk_backlog.len = 0;
2270
2271 atomic_set(&newsk->sk_rmem_alloc, 0);
2272
2273 /* sk_wmem_alloc set to one (see sk_free() and sock_wfree()) */
2274 refcount_set(&newsk->sk_wmem_alloc, 1);
2275
2276 atomic_set(&newsk->sk_omem_alloc, 0);
2277 sk_init_common(newsk);
2278
2279 newsk->sk_dst_cache = NULL;
2280 newsk->sk_dst_pending_confirm = 0;
2281 newsk->sk_wmem_queued = 0;
2282 newsk->sk_forward_alloc = 0;
2283 newsk->sk_reserved_mem = 0;
2284 atomic_set(&newsk->sk_drops, 0);
2285 newsk->sk_send_head = NULL;
2286 newsk->sk_userlocks = sk->sk_userlocks & ~SOCK_BINDPORT_LOCK;
2287 atomic_set(&newsk->sk_zckey, 0);
2288
2289 sock_reset_flag(newsk, SOCK_DONE);
2290
2291 /* sk->sk_memcg will be populated at accept() time */
2292 newsk->sk_memcg = NULL;
2293
2294 cgroup_sk_clone(&newsk->sk_cgrp_data);
2295
2296 rcu_read_lock();
2297 filter = rcu_dereference(sk->sk_filter);
2298 if (filter != NULL)
2299 /* though it's an empty new sock, the charging may fail
2300 * if sysctl_optmem_max was changed between creation of
2301 * original socket and cloning
2302 */
2303 is_charged = sk_filter_charge(newsk, filter);
2304 RCU_INIT_POINTER(newsk->sk_filter, filter);
2305 rcu_read_unlock();
2306
2307 if (unlikely(!is_charged || xfrm_sk_clone_policy(newsk, sk))) {
2308 /* We need to make sure that we don't uncharge the new
2309 * socket if we couldn't charge it in the first place
2310 * as otherwise we uncharge the parent's filter.
2311 */
2312 if (!is_charged)
2313 RCU_INIT_POINTER(newsk->sk_filter, NULL);
2314 sk_free_unlock_clone(newsk);
2315 newsk = NULL;
2316 goto out;
2317 }
2318 RCU_INIT_POINTER(newsk->sk_reuseport_cb, NULL);
2319
2320 if (bpf_sk_storage_clone(sk, newsk)) {
2321 sk_free_unlock_clone(newsk);
2322 newsk = NULL;
2323 goto out;
2324 }
2325
2326 /* Clear sk_user_data if parent had the pointer tagged
2327 * as not suitable for copying when cloning.
2328 */
2329 if (sk_user_data_is_nocopy(newsk))
2330 newsk->sk_user_data = NULL;
2331
2332 newsk->sk_err = 0;
2333 newsk->sk_err_soft = 0;
2334 newsk->sk_priority = 0;
2335 newsk->sk_incoming_cpu = raw_smp_processor_id();
2336
2337 /* Before updating sk_refcnt, we must commit prior changes to memory
2338 * (Documentation/RCU/rculist_nulls.rst for details)
2339 */
2340 smp_wmb();
2341 refcount_set(&newsk->sk_refcnt, 2);
2342
2343 /* Increment the counter in the same struct proto as the master
2344 * sock (sk_refcnt_debug_inc uses newsk->sk_prot->socks, that
2345 * is the same as sk->sk_prot->socks, as this field was copied
2346 * with memcpy).
2347 *
2348 * This _changes_ the previous behaviour, where
2349 * tcp_create_openreq_child always was incrementing the
2350 * equivalent to tcp_prot->socks (inet_sock_nr), so this have
2351 * to be taken into account in all callers. -acme
2352 */
2353 sk_refcnt_debug_inc(newsk);
2354 sk_set_socket(newsk, NULL);
2355 sk_tx_queue_clear(newsk);
2356 RCU_INIT_POINTER(newsk->sk_wq, NULL);
2357
2358 if (newsk->sk_prot->sockets_allocated)
2359 sk_sockets_allocated_inc(newsk);
2360
2361 if (sock_needs_netstamp(sk) && newsk->sk_flags & SK_FLAGS_TIMESTAMP)
2362 net_enable_timestamp();
2363out:
2364 return newsk;
2365}
2366EXPORT_SYMBOL_GPL(sk_clone_lock);
2367
2368void sk_free_unlock_clone(struct sock *sk)
2369{
2370 /* It is still raw copy of parent, so invalidate
2371 * destructor and make plain sk_free() */
2372 sk->sk_destruct = NULL;
2373 bh_unlock_sock(sk);
2374 sk_free(sk);
2375}
2376EXPORT_SYMBOL_GPL(sk_free_unlock_clone);
2377
2378static void sk_trim_gso_size(struct sock *sk)
2379{
2380 if (sk->sk_gso_max_size <= GSO_LEGACY_MAX_SIZE)
2381 return;
2382#if IS_ENABLED(CONFIG_IPV6)
2383 if (sk->sk_family == AF_INET6 &&
2384 sk_is_tcp(sk) &&
2385 !ipv6_addr_v4mapped(&sk->sk_v6_rcv_saddr))
2386 return;
2387#endif
2388 sk->sk_gso_max_size = GSO_LEGACY_MAX_SIZE;
2389}
2390
2391void sk_setup_caps(struct sock *sk, struct dst_entry *dst)
2392{
2393 u32 max_segs = 1;
2394
2395 sk_dst_set(sk, dst);
2396 sk->sk_route_caps = dst->dev->features;
2397 if (sk_is_tcp(sk))
2398 sk->sk_route_caps |= NETIF_F_GSO;
2399 if (sk->sk_route_caps & NETIF_F_GSO)
2400 sk->sk_route_caps |= NETIF_F_GSO_SOFTWARE;
2401 if (unlikely(sk->sk_gso_disabled))
2402 sk->sk_route_caps &= ~NETIF_F_GSO_MASK;
2403 if (sk_can_gso(sk)) {
2404 if (dst->header_len && !xfrm_dst_offload_ok(dst)) {
2405 sk->sk_route_caps &= ~NETIF_F_GSO_MASK;
2406 } else {
2407 sk->sk_route_caps |= NETIF_F_SG | NETIF_F_HW_CSUM;
2408 /* pairs with the WRITE_ONCE() in netif_set_gso_max_size() */
2409 sk->sk_gso_max_size = READ_ONCE(dst->dev->gso_max_size);
2410 sk_trim_gso_size(sk);
2411 sk->sk_gso_max_size -= (MAX_TCP_HEADER + 1);
2412 /* pairs with the WRITE_ONCE() in netif_set_gso_max_segs() */
2413 max_segs = max_t(u32, READ_ONCE(dst->dev->gso_max_segs), 1);
2414 }
2415 }
2416 sk->sk_gso_max_segs = max_segs;
2417}
2418EXPORT_SYMBOL_GPL(sk_setup_caps);
2419
2420/*
2421 * Simple resource managers for sockets.
2422 */
2423
2424
2425/*
2426 * Write buffer destructor automatically called from kfree_skb.
2427 */
2428void sock_wfree(struct sk_buff *skb)
2429{
2430 struct sock *sk = skb->sk;
2431 unsigned int len = skb->truesize;
2432 bool free;
2433
2434 if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE)) {
2435 if (sock_flag(sk, SOCK_RCU_FREE) &&
2436 sk->sk_write_space == sock_def_write_space) {
2437 rcu_read_lock();
2438 free = refcount_sub_and_test(len, &sk->sk_wmem_alloc);
2439 sock_def_write_space_wfree(sk);
2440 rcu_read_unlock();
2441 if (unlikely(free))
2442 __sk_free(sk);
2443 return;
2444 }
2445
2446 /*
2447 * Keep a reference on sk_wmem_alloc, this will be released
2448 * after sk_write_space() call
2449 */
2450 WARN_ON(refcount_sub_and_test(len - 1, &sk->sk_wmem_alloc));
2451 sk->sk_write_space(sk);
2452 len = 1;
2453 }
2454 /*
2455 * if sk_wmem_alloc reaches 0, we must finish what sk_free()
2456 * could not do because of in-flight packets
2457 */
2458 if (refcount_sub_and_test(len, &sk->sk_wmem_alloc))
2459 __sk_free(sk);
2460}
2461EXPORT_SYMBOL(sock_wfree);
2462
2463/* This variant of sock_wfree() is used by TCP,
2464 * since it sets SOCK_USE_WRITE_QUEUE.
2465 */
2466void __sock_wfree(struct sk_buff *skb)
2467{
2468 struct sock *sk = skb->sk;
2469
2470 if (refcount_sub_and_test(skb->truesize, &sk->sk_wmem_alloc))
2471 __sk_free(sk);
2472}
2473
2474void skb_set_owner_w(struct sk_buff *skb, struct sock *sk)
2475{
2476 skb_orphan(skb);
2477 skb->sk = sk;
2478#ifdef CONFIG_INET
2479 if (unlikely(!sk_fullsock(sk))) {
2480 skb->destructor = sock_edemux;
2481 sock_hold(sk);
2482 return;
2483 }
2484#endif
2485 skb->destructor = sock_wfree;
2486 skb_set_hash_from_sk(skb, sk);
2487 /*
2488 * We used to take a refcount on sk, but following operation
2489 * is enough to guarantee sk_free() wont free this sock until
2490 * all in-flight packets are completed
2491 */
2492 refcount_add(skb->truesize, &sk->sk_wmem_alloc);
2493}
2494EXPORT_SYMBOL(skb_set_owner_w);
2495
2496static bool can_skb_orphan_partial(const struct sk_buff *skb)
2497{
2498#ifdef CONFIG_TLS_DEVICE
2499 /* Drivers depend on in-order delivery for crypto offload,
2500 * partial orphan breaks out-of-order-OK logic.
2501 */
2502 if (skb->decrypted)
2503 return false;
2504#endif
2505 return (skb->destructor == sock_wfree ||
2506 (IS_ENABLED(CONFIG_INET) && skb->destructor == tcp_wfree));
2507}
2508
2509/* This helper is used by netem, as it can hold packets in its
2510 * delay queue. We want to allow the owner socket to send more
2511 * packets, as if they were already TX completed by a typical driver.
2512 * But we also want to keep skb->sk set because some packet schedulers
2513 * rely on it (sch_fq for example).
2514 */
2515void skb_orphan_partial(struct sk_buff *skb)
2516{
2517 if (skb_is_tcp_pure_ack(skb))
2518 return;
2519
2520 if (can_skb_orphan_partial(skb) && skb_set_owner_sk_safe(skb, skb->sk))
2521 return;
2522
2523 skb_orphan(skb);
2524}
2525EXPORT_SYMBOL(skb_orphan_partial);
2526
2527/*
2528 * Read buffer destructor automatically called from kfree_skb.
2529 */
2530void sock_rfree(struct sk_buff *skb)
2531{
2532 struct sock *sk = skb->sk;
2533 unsigned int len = skb->truesize;
2534
2535 atomic_sub(len, &sk->sk_rmem_alloc);
2536 sk_mem_uncharge(sk, len);
2537}
2538EXPORT_SYMBOL(sock_rfree);
2539
2540/*
2541 * Buffer destructor for skbs that are not used directly in read or write
2542 * path, e.g. for error handler skbs. Automatically called from kfree_skb.
2543 */
2544void sock_efree(struct sk_buff *skb)
2545{
2546 sock_put(skb->sk);
2547}
2548EXPORT_SYMBOL(sock_efree);
2549
2550/* Buffer destructor for prefetch/receive path where reference count may
2551 * not be held, e.g. for listen sockets.
2552 */
2553#ifdef CONFIG_INET
2554void sock_pfree(struct sk_buff *skb)
2555{
2556 if (sk_is_refcounted(skb->sk))
2557 sock_gen_put(skb->sk);
2558}
2559EXPORT_SYMBOL(sock_pfree);
2560#endif /* CONFIG_INET */
2561
2562kuid_t sock_i_uid(struct sock *sk)
2563{
2564 kuid_t uid;
2565
2566 read_lock_bh(&sk->sk_callback_lock);
2567 uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : GLOBAL_ROOT_UID;
2568 read_unlock_bh(&sk->sk_callback_lock);
2569 return uid;
2570}
2571EXPORT_SYMBOL(sock_i_uid);
2572
2573unsigned long sock_i_ino(struct sock *sk)
2574{
2575 unsigned long ino;
2576
2577 read_lock_bh(&sk->sk_callback_lock);
2578 ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0;
2579 read_unlock_bh(&sk->sk_callback_lock);
2580 return ino;
2581}
2582EXPORT_SYMBOL(sock_i_ino);
2583
2584/*
2585 * Allocate a skb from the socket's send buffer.
2586 */
2587struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force,
2588 gfp_t priority)
2589{
2590 if (force ||
2591 refcount_read(&sk->sk_wmem_alloc) < READ_ONCE(sk->sk_sndbuf)) {
2592 struct sk_buff *skb = alloc_skb(size, priority);
2593
2594 if (skb) {
2595 skb_set_owner_w(skb, sk);
2596 return skb;
2597 }
2598 }
2599 return NULL;
2600}
2601EXPORT_SYMBOL(sock_wmalloc);
2602
2603static void sock_ofree(struct sk_buff *skb)
2604{
2605 struct sock *sk = skb->sk;
2606
2607 atomic_sub(skb->truesize, &sk->sk_omem_alloc);
2608}
2609
2610struct sk_buff *sock_omalloc(struct sock *sk, unsigned long size,
2611 gfp_t priority)
2612{
2613 struct sk_buff *skb;
2614
2615 /* small safe race: SKB_TRUESIZE may differ from final skb->truesize */
2616 if (atomic_read(&sk->sk_omem_alloc) + SKB_TRUESIZE(size) >
2617 READ_ONCE(sysctl_optmem_max))
2618 return NULL;
2619
2620 skb = alloc_skb(size, priority);
2621 if (!skb)
2622 return NULL;
2623
2624 atomic_add(skb->truesize, &sk->sk_omem_alloc);
2625 skb->sk = sk;
2626 skb->destructor = sock_ofree;
2627 return skb;
2628}
2629
2630/*
2631 * Allocate a memory block from the socket's option memory buffer.
2632 */
2633void *sock_kmalloc(struct sock *sk, int size, gfp_t priority)
2634{
2635 int optmem_max = READ_ONCE(sysctl_optmem_max);
2636
2637 if ((unsigned int)size <= optmem_max &&
2638 atomic_read(&sk->sk_omem_alloc) + size < optmem_max) {
2639 void *mem;
2640 /* First do the add, to avoid the race if kmalloc
2641 * might sleep.
2642 */
2643 atomic_add(size, &sk->sk_omem_alloc);
2644 mem = kmalloc(size, priority);
2645 if (mem)
2646 return mem;
2647 atomic_sub(size, &sk->sk_omem_alloc);
2648 }
2649 return NULL;
2650}
2651EXPORT_SYMBOL(sock_kmalloc);
2652
2653/* Free an option memory block. Note, we actually want the inline
2654 * here as this allows gcc to detect the nullify and fold away the
2655 * condition entirely.
2656 */
2657static inline void __sock_kfree_s(struct sock *sk, void *mem, int size,
2658 const bool nullify)
2659{
2660 if (WARN_ON_ONCE(!mem))
2661 return;
2662 if (nullify)
2663 kfree_sensitive(mem);
2664 else
2665 kfree(mem);
2666 atomic_sub(size, &sk->sk_omem_alloc);
2667}
2668
2669void sock_kfree_s(struct sock *sk, void *mem, int size)
2670{
2671 __sock_kfree_s(sk, mem, size, false);
2672}
2673EXPORT_SYMBOL(sock_kfree_s);
2674
2675void sock_kzfree_s(struct sock *sk, void *mem, int size)
2676{
2677 __sock_kfree_s(sk, mem, size, true);
2678}
2679EXPORT_SYMBOL(sock_kzfree_s);
2680
2681/* It is almost wait_for_tcp_memory minus release_sock/lock_sock.
2682 I think, these locks should be removed for datagram sockets.
2683 */
2684static long sock_wait_for_wmem(struct sock *sk, long timeo)
2685{
2686 DEFINE_WAIT(wait);
2687
2688 sk_clear_bit(SOCKWQ_ASYNC_NOSPACE, sk);
2689 for (;;) {
2690 if (!timeo)
2691 break;
2692 if (signal_pending(current))
2693 break;
2694 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
2695 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
2696 if (refcount_read(&sk->sk_wmem_alloc) < READ_ONCE(sk->sk_sndbuf))
2697 break;
2698 if (sk->sk_shutdown & SEND_SHUTDOWN)
2699 break;
2700 if (sk->sk_err)
2701 break;
2702 timeo = schedule_timeout(timeo);
2703 }
2704 finish_wait(sk_sleep(sk), &wait);
2705 return timeo;
2706}
2707
2708
2709/*
2710 * Generic send/receive buffer handlers
2711 */
2712
2713struct sk_buff *sock_alloc_send_pskb(struct sock *sk, unsigned long header_len,
2714 unsigned long data_len, int noblock,
2715 int *errcode, int max_page_order)
2716{
2717 struct sk_buff *skb;
2718 long timeo;
2719 int err;
2720
2721 timeo = sock_sndtimeo(sk, noblock);
2722 for (;;) {
2723 err = sock_error(sk);
2724 if (err != 0)
2725 goto failure;
2726
2727 err = -EPIPE;
2728 if (sk->sk_shutdown & SEND_SHUTDOWN)
2729 goto failure;
2730
2731 if (sk_wmem_alloc_get(sk) < READ_ONCE(sk->sk_sndbuf))
2732 break;
2733
2734 sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk);
2735 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
2736 err = -EAGAIN;
2737 if (!timeo)
2738 goto failure;
2739 if (signal_pending(current))
2740 goto interrupted;
2741 timeo = sock_wait_for_wmem(sk, timeo);
2742 }
2743 skb = alloc_skb_with_frags(header_len, data_len, max_page_order,
2744 errcode, sk->sk_allocation);
2745 if (skb)
2746 skb_set_owner_w(skb, sk);
2747 return skb;
2748
2749interrupted:
2750 err = sock_intr_errno(timeo);
2751failure:
2752 *errcode = err;
2753 return NULL;
2754}
2755EXPORT_SYMBOL(sock_alloc_send_pskb);
2756
2757int __sock_cmsg_send(struct sock *sk, struct cmsghdr *cmsg,
2758 struct sockcm_cookie *sockc)
2759{
2760 u32 tsflags;
2761
2762 switch (cmsg->cmsg_type) {
2763 case SO_MARK:
2764 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_RAW) &&
2765 !ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
2766 return -EPERM;
2767 if (cmsg->cmsg_len != CMSG_LEN(sizeof(u32)))
2768 return -EINVAL;
2769 sockc->mark = *(u32 *)CMSG_DATA(cmsg);
2770 break;
2771 case SO_TIMESTAMPING_OLD:
2772 if (cmsg->cmsg_len != CMSG_LEN(sizeof(u32)))
2773 return -EINVAL;
2774
2775 tsflags = *(u32 *)CMSG_DATA(cmsg);
2776 if (tsflags & ~SOF_TIMESTAMPING_TX_RECORD_MASK)
2777 return -EINVAL;
2778
2779 sockc->tsflags &= ~SOF_TIMESTAMPING_TX_RECORD_MASK;
2780 sockc->tsflags |= tsflags;
2781 break;
2782 case SCM_TXTIME:
2783 if (!sock_flag(sk, SOCK_TXTIME))
2784 return -EINVAL;
2785 if (cmsg->cmsg_len != CMSG_LEN(sizeof(u64)))
2786 return -EINVAL;
2787 sockc->transmit_time = get_unaligned((u64 *)CMSG_DATA(cmsg));
2788 break;
2789 /* SCM_RIGHTS and SCM_CREDENTIALS are semantically in SOL_UNIX. */
2790 case SCM_RIGHTS:
2791 case SCM_CREDENTIALS:
2792 break;
2793 default:
2794 return -EINVAL;
2795 }
2796 return 0;
2797}
2798EXPORT_SYMBOL(__sock_cmsg_send);
2799
2800int sock_cmsg_send(struct sock *sk, struct msghdr *msg,
2801 struct sockcm_cookie *sockc)
2802{
2803 struct cmsghdr *cmsg;
2804 int ret;
2805
2806 for_each_cmsghdr(cmsg, msg) {
2807 if (!CMSG_OK(msg, cmsg))
2808 return -EINVAL;
2809 if (cmsg->cmsg_level != SOL_SOCKET)
2810 continue;
2811 ret = __sock_cmsg_send(sk, cmsg, sockc);
2812 if (ret)
2813 return ret;
2814 }
2815 return 0;
2816}
2817EXPORT_SYMBOL(sock_cmsg_send);
2818
2819static void sk_enter_memory_pressure(struct sock *sk)
2820{
2821 if (!sk->sk_prot->enter_memory_pressure)
2822 return;
2823
2824 sk->sk_prot->enter_memory_pressure(sk);
2825}
2826
2827static void sk_leave_memory_pressure(struct sock *sk)
2828{
2829 if (sk->sk_prot->leave_memory_pressure) {
2830 sk->sk_prot->leave_memory_pressure(sk);
2831 } else {
2832 unsigned long *memory_pressure = sk->sk_prot->memory_pressure;
2833
2834 if (memory_pressure && READ_ONCE(*memory_pressure))
2835 WRITE_ONCE(*memory_pressure, 0);
2836 }
2837}
2838
2839DEFINE_STATIC_KEY_FALSE(net_high_order_alloc_disable_key);
2840
2841/**
2842 * skb_page_frag_refill - check that a page_frag contains enough room
2843 * @sz: minimum size of the fragment we want to get
2844 * @pfrag: pointer to page_frag
2845 * @gfp: priority for memory allocation
2846 *
2847 * Note: While this allocator tries to use high order pages, there is
2848 * no guarantee that allocations succeed. Therefore, @sz MUST be
2849 * less or equal than PAGE_SIZE.
2850 */
2851bool skb_page_frag_refill(unsigned int sz, struct page_frag *pfrag, gfp_t gfp)
2852{
2853 if (pfrag->page) {
2854 if (page_ref_count(pfrag->page) == 1) {
2855 pfrag->offset = 0;
2856 return true;
2857 }
2858 if (pfrag->offset + sz <= pfrag->size)
2859 return true;
2860 put_page(pfrag->page);
2861 }
2862
2863 pfrag->offset = 0;
2864 if (SKB_FRAG_PAGE_ORDER &&
2865 !static_branch_unlikely(&net_high_order_alloc_disable_key)) {
2866 /* Avoid direct reclaim but allow kswapd to wake */
2867 pfrag->page = alloc_pages((gfp & ~__GFP_DIRECT_RECLAIM) |
2868 __GFP_COMP | __GFP_NOWARN |
2869 __GFP_NORETRY,
2870 SKB_FRAG_PAGE_ORDER);
2871 if (likely(pfrag->page)) {
2872 pfrag->size = PAGE_SIZE << SKB_FRAG_PAGE_ORDER;
2873 return true;
2874 }
2875 }
2876 pfrag->page = alloc_page(gfp);
2877 if (likely(pfrag->page)) {
2878 pfrag->size = PAGE_SIZE;
2879 return true;
2880 }
2881 return false;
2882}
2883EXPORT_SYMBOL(skb_page_frag_refill);
2884
2885bool sk_page_frag_refill(struct sock *sk, struct page_frag *pfrag)
2886{
2887 if (likely(skb_page_frag_refill(32U, pfrag, sk->sk_allocation)))
2888 return true;
2889
2890 sk_enter_memory_pressure(sk);
2891 sk_stream_moderate_sndbuf(sk);
2892 return false;
2893}
2894EXPORT_SYMBOL(sk_page_frag_refill);
2895
2896void __lock_sock(struct sock *sk)
2897 __releases(&sk->sk_lock.slock)
2898 __acquires(&sk->sk_lock.slock)
2899{
2900 DEFINE_WAIT(wait);
2901
2902 for (;;) {
2903 prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait,
2904 TASK_UNINTERRUPTIBLE);
2905 spin_unlock_bh(&sk->sk_lock.slock);
2906 schedule();
2907 spin_lock_bh(&sk->sk_lock.slock);
2908 if (!sock_owned_by_user(sk))
2909 break;
2910 }
2911 finish_wait(&sk->sk_lock.wq, &wait);
2912}
2913
2914void __release_sock(struct sock *sk)
2915 __releases(&sk->sk_lock.slock)
2916 __acquires(&sk->sk_lock.slock)
2917{
2918 struct sk_buff *skb, *next;
2919
2920 while ((skb = sk->sk_backlog.head) != NULL) {
2921 sk->sk_backlog.head = sk->sk_backlog.tail = NULL;
2922
2923 spin_unlock_bh(&sk->sk_lock.slock);
2924
2925 do {
2926 next = skb->next;
2927 prefetch(next);
2928 DEBUG_NET_WARN_ON_ONCE(skb_dst_is_noref(skb));
2929 skb_mark_not_on_list(skb);
2930 sk_backlog_rcv(sk, skb);
2931
2932 cond_resched();
2933
2934 skb = next;
2935 } while (skb != NULL);
2936
2937 spin_lock_bh(&sk->sk_lock.slock);
2938 }
2939
2940 /*
2941 * Doing the zeroing here guarantee we can not loop forever
2942 * while a wild producer attempts to flood us.
2943 */
2944 sk->sk_backlog.len = 0;
2945}
2946
2947void __sk_flush_backlog(struct sock *sk)
2948{
2949 spin_lock_bh(&sk->sk_lock.slock);
2950 __release_sock(sk);
2951 spin_unlock_bh(&sk->sk_lock.slock);
2952}
2953EXPORT_SYMBOL_GPL(__sk_flush_backlog);
2954
2955/**
2956 * sk_wait_data - wait for data to arrive at sk_receive_queue
2957 * @sk: sock to wait on
2958 * @timeo: for how long
2959 * @skb: last skb seen on sk_receive_queue
2960 *
2961 * Now socket state including sk->sk_err is changed only under lock,
2962 * hence we may omit checks after joining wait queue.
2963 * We check receive queue before schedule() only as optimization;
2964 * it is very likely that release_sock() added new data.
2965 */
2966int sk_wait_data(struct sock *sk, long *timeo, const struct sk_buff *skb)
2967{
2968 DEFINE_WAIT_FUNC(wait, woken_wake_function);
2969 int rc;
2970
2971 add_wait_queue(sk_sleep(sk), &wait);
2972 sk_set_bit(SOCKWQ_ASYNC_WAITDATA, sk);
2973 rc = sk_wait_event(sk, timeo, skb_peek_tail(&sk->sk_receive_queue) != skb, &wait);
2974 sk_clear_bit(SOCKWQ_ASYNC_WAITDATA, sk);
2975 remove_wait_queue(sk_sleep(sk), &wait);
2976 return rc;
2977}
2978EXPORT_SYMBOL(sk_wait_data);
2979
2980/**
2981 * __sk_mem_raise_allocated - increase memory_allocated
2982 * @sk: socket
2983 * @size: memory size to allocate
2984 * @amt: pages to allocate
2985 * @kind: allocation type
2986 *
2987 * Similar to __sk_mem_schedule(), but does not update sk_forward_alloc
2988 */
2989int __sk_mem_raise_allocated(struct sock *sk, int size, int amt, int kind)
2990{
2991 bool memcg_charge = mem_cgroup_sockets_enabled && sk->sk_memcg;
2992 struct proto *prot = sk->sk_prot;
2993 bool charged = true;
2994 long allocated;
2995
2996 sk_memory_allocated_add(sk, amt);
2997 allocated = sk_memory_allocated(sk);
2998 if (memcg_charge &&
2999 !(charged = mem_cgroup_charge_skmem(sk->sk_memcg, amt,
3000 gfp_memcg_charge())))
3001 goto suppress_allocation;
3002
3003 /* Under limit. */
3004 if (allocated <= sk_prot_mem_limits(sk, 0)) {
3005 sk_leave_memory_pressure(sk);
3006 return 1;
3007 }
3008
3009 /* Under pressure. */
3010 if (allocated > sk_prot_mem_limits(sk, 1))
3011 sk_enter_memory_pressure(sk);
3012
3013 /* Over hard limit. */
3014 if (allocated > sk_prot_mem_limits(sk, 2))
3015 goto suppress_allocation;
3016
3017 /* guarantee minimum buffer size under pressure */
3018 if (kind == SK_MEM_RECV) {
3019 if (atomic_read(&sk->sk_rmem_alloc) < sk_get_rmem0(sk, prot))
3020 return 1;
3021
3022 } else { /* SK_MEM_SEND */
3023 int wmem0 = sk_get_wmem0(sk, prot);
3024
3025 if (sk->sk_type == SOCK_STREAM) {
3026 if (sk->sk_wmem_queued < wmem0)
3027 return 1;
3028 } else if (refcount_read(&sk->sk_wmem_alloc) < wmem0) {
3029 return 1;
3030 }
3031 }
3032
3033 if (sk_has_memory_pressure(sk)) {
3034 u64 alloc;
3035
3036 if (!sk_under_memory_pressure(sk))
3037 return 1;
3038 alloc = sk_sockets_allocated_read_positive(sk);
3039 if (sk_prot_mem_limits(sk, 2) > alloc *
3040 sk_mem_pages(sk->sk_wmem_queued +
3041 atomic_read(&sk->sk_rmem_alloc) +
3042 sk->sk_forward_alloc))
3043 return 1;
3044 }
3045
3046suppress_allocation:
3047
3048 if (kind == SK_MEM_SEND && sk->sk_type == SOCK_STREAM) {
3049 sk_stream_moderate_sndbuf(sk);
3050
3051 /* Fail only if socket is _under_ its sndbuf.
3052 * In this case we cannot block, so that we have to fail.
3053 */
3054 if (sk->sk_wmem_queued + size >= sk->sk_sndbuf) {
3055 /* Force charge with __GFP_NOFAIL */
3056 if (memcg_charge && !charged) {
3057 mem_cgroup_charge_skmem(sk->sk_memcg, amt,
3058 gfp_memcg_charge() | __GFP_NOFAIL);
3059 }
3060 return 1;
3061 }
3062 }
3063
3064 if (kind == SK_MEM_SEND || (kind == SK_MEM_RECV && charged))
3065 trace_sock_exceed_buf_limit(sk, prot, allocated, kind);
3066
3067 sk_memory_allocated_sub(sk, amt);
3068
3069 if (memcg_charge && charged)
3070 mem_cgroup_uncharge_skmem(sk->sk_memcg, amt);
3071
3072 return 0;
3073}
3074
3075/**
3076 * __sk_mem_schedule - increase sk_forward_alloc and memory_allocated
3077 * @sk: socket
3078 * @size: memory size to allocate
3079 * @kind: allocation type
3080 *
3081 * If kind is SK_MEM_SEND, it means wmem allocation. Otherwise it means
3082 * rmem allocation. This function assumes that protocols which have
3083 * memory_pressure use sk_wmem_queued as write buffer accounting.
3084 */
3085int __sk_mem_schedule(struct sock *sk, int size, int kind)
3086{
3087 int ret, amt = sk_mem_pages(size);
3088
3089 sk->sk_forward_alloc += amt << PAGE_SHIFT;
3090 ret = __sk_mem_raise_allocated(sk, size, amt, kind);
3091 if (!ret)
3092 sk->sk_forward_alloc -= amt << PAGE_SHIFT;
3093 return ret;
3094}
3095EXPORT_SYMBOL(__sk_mem_schedule);
3096
3097/**
3098 * __sk_mem_reduce_allocated - reclaim memory_allocated
3099 * @sk: socket
3100 * @amount: number of quanta
3101 *
3102 * Similar to __sk_mem_reclaim(), but does not update sk_forward_alloc
3103 */
3104void __sk_mem_reduce_allocated(struct sock *sk, int amount)
3105{
3106 sk_memory_allocated_sub(sk, amount);
3107
3108 if (mem_cgroup_sockets_enabled && sk->sk_memcg)
3109 mem_cgroup_uncharge_skmem(sk->sk_memcg, amount);
3110
3111 if (sk_under_memory_pressure(sk) &&
3112 (sk_memory_allocated(sk) < sk_prot_mem_limits(sk, 0)))
3113 sk_leave_memory_pressure(sk);
3114}
3115
3116/**
3117 * __sk_mem_reclaim - reclaim sk_forward_alloc and memory_allocated
3118 * @sk: socket
3119 * @amount: number of bytes (rounded down to a PAGE_SIZE multiple)
3120 */
3121void __sk_mem_reclaim(struct sock *sk, int amount)
3122{
3123 amount >>= PAGE_SHIFT;
3124 sk->sk_forward_alloc -= amount << PAGE_SHIFT;
3125 __sk_mem_reduce_allocated(sk, amount);
3126}
3127EXPORT_SYMBOL(__sk_mem_reclaim);
3128
3129int sk_set_peek_off(struct sock *sk, int val)
3130{
3131 sk->sk_peek_off = val;
3132 return 0;
3133}
3134EXPORT_SYMBOL_GPL(sk_set_peek_off);
3135
3136/*
3137 * Set of default routines for initialising struct proto_ops when
3138 * the protocol does not support a particular function. In certain
3139 * cases where it makes no sense for a protocol to have a "do nothing"
3140 * function, some default processing is provided.
3141 */
3142
3143int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len)
3144{
3145 return -EOPNOTSUPP;
3146}
3147EXPORT_SYMBOL(sock_no_bind);
3148
3149int sock_no_connect(struct socket *sock, struct sockaddr *saddr,
3150 int len, int flags)
3151{
3152 return -EOPNOTSUPP;
3153}
3154EXPORT_SYMBOL(sock_no_connect);
3155
3156int sock_no_socketpair(struct socket *sock1, struct socket *sock2)
3157{
3158 return -EOPNOTSUPP;
3159}
3160EXPORT_SYMBOL(sock_no_socketpair);
3161
3162int sock_no_accept(struct socket *sock, struct socket *newsock, int flags,
3163 bool kern)
3164{
3165 return -EOPNOTSUPP;
3166}
3167EXPORT_SYMBOL(sock_no_accept);
3168
3169int sock_no_getname(struct socket *sock, struct sockaddr *saddr,
3170 int peer)
3171{
3172 return -EOPNOTSUPP;
3173}
3174EXPORT_SYMBOL(sock_no_getname);
3175
3176int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
3177{
3178 return -EOPNOTSUPP;
3179}
3180EXPORT_SYMBOL(sock_no_ioctl);
3181
3182int sock_no_listen(struct socket *sock, int backlog)
3183{
3184 return -EOPNOTSUPP;
3185}
3186EXPORT_SYMBOL(sock_no_listen);
3187
3188int sock_no_shutdown(struct socket *sock, int how)
3189{
3190 return -EOPNOTSUPP;
3191}
3192EXPORT_SYMBOL(sock_no_shutdown);
3193
3194int sock_no_sendmsg(struct socket *sock, struct msghdr *m, size_t len)
3195{
3196 return -EOPNOTSUPP;
3197}
3198EXPORT_SYMBOL(sock_no_sendmsg);
3199
3200int sock_no_sendmsg_locked(struct sock *sk, struct msghdr *m, size_t len)
3201{
3202 return -EOPNOTSUPP;
3203}
3204EXPORT_SYMBOL(sock_no_sendmsg_locked);
3205
3206int sock_no_recvmsg(struct socket *sock, struct msghdr *m, size_t len,
3207 int flags)
3208{
3209 return -EOPNOTSUPP;
3210}
3211EXPORT_SYMBOL(sock_no_recvmsg);
3212
3213int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma)
3214{
3215 /* Mirror missing mmap method error code */
3216 return -ENODEV;
3217}
3218EXPORT_SYMBOL(sock_no_mmap);
3219
3220/*
3221 * When a file is received (via SCM_RIGHTS, etc), we must bump the
3222 * various sock-based usage counts.
3223 */
3224void __receive_sock(struct file *file)
3225{
3226 struct socket *sock;
3227
3228 sock = sock_from_file(file);
3229 if (sock) {
3230 sock_update_netprioidx(&sock->sk->sk_cgrp_data);
3231 sock_update_classid(&sock->sk->sk_cgrp_data);
3232 }
3233}
3234
3235ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags)
3236{
3237 ssize_t res;
3238 struct msghdr msg = {.msg_flags = flags};
3239 struct kvec iov;
3240 char *kaddr = kmap(page);
3241 iov.iov_base = kaddr + offset;
3242 iov.iov_len = size;
3243 res = kernel_sendmsg(sock, &msg, &iov, 1, size);
3244 kunmap(page);
3245 return res;
3246}
3247EXPORT_SYMBOL(sock_no_sendpage);
3248
3249ssize_t sock_no_sendpage_locked(struct sock *sk, struct page *page,
3250 int offset, size_t size, int flags)
3251{
3252 ssize_t res;
3253 struct msghdr msg = {.msg_flags = flags};
3254 struct kvec iov;
3255 char *kaddr = kmap(page);
3256
3257 iov.iov_base = kaddr + offset;
3258 iov.iov_len = size;
3259 res = kernel_sendmsg_locked(sk, &msg, &iov, 1, size);
3260 kunmap(page);
3261 return res;
3262}
3263EXPORT_SYMBOL(sock_no_sendpage_locked);
3264
3265/*
3266 * Default Socket Callbacks
3267 */
3268
3269static void sock_def_wakeup(struct sock *sk)
3270{
3271 struct socket_wq *wq;
3272
3273 rcu_read_lock();
3274 wq = rcu_dereference(sk->sk_wq);
3275 if (skwq_has_sleeper(wq))
3276 wake_up_interruptible_all(&wq->wait);
3277 rcu_read_unlock();
3278}
3279
3280static void sock_def_error_report(struct sock *sk)
3281{
3282 struct socket_wq *wq;
3283
3284 rcu_read_lock();
3285 wq = rcu_dereference(sk->sk_wq);
3286 if (skwq_has_sleeper(wq))
3287 wake_up_interruptible_poll(&wq->wait, EPOLLERR);
3288 sk_wake_async(sk, SOCK_WAKE_IO, POLL_ERR);
3289 rcu_read_unlock();
3290}
3291
3292void sock_def_readable(struct sock *sk)
3293{
3294 struct socket_wq *wq;
3295
3296 rcu_read_lock();
3297 wq = rcu_dereference(sk->sk_wq);
3298 if (skwq_has_sleeper(wq))
3299 wake_up_interruptible_sync_poll(&wq->wait, EPOLLIN | EPOLLPRI |
3300 EPOLLRDNORM | EPOLLRDBAND);
3301 sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN);
3302 rcu_read_unlock();
3303}
3304
3305static void sock_def_write_space(struct sock *sk)
3306{
3307 struct socket_wq *wq;
3308
3309 rcu_read_lock();
3310
3311 /* Do not wake up a writer until he can make "significant"
3312 * progress. --DaveM
3313 */
3314 if (sock_writeable(sk)) {
3315 wq = rcu_dereference(sk->sk_wq);
3316 if (skwq_has_sleeper(wq))
3317 wake_up_interruptible_sync_poll(&wq->wait, EPOLLOUT |
3318 EPOLLWRNORM | EPOLLWRBAND);
3319
3320 /* Should agree with poll, otherwise some programs break */
3321 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
3322 }
3323
3324 rcu_read_unlock();
3325}
3326
3327/* An optimised version of sock_def_write_space(), should only be called
3328 * for SOCK_RCU_FREE sockets under RCU read section and after putting
3329 * ->sk_wmem_alloc.
3330 */
3331static void sock_def_write_space_wfree(struct sock *sk)
3332{
3333 /* Do not wake up a writer until he can make "significant"
3334 * progress. --DaveM
3335 */
3336 if (sock_writeable(sk)) {
3337 struct socket_wq *wq = rcu_dereference(sk->sk_wq);
3338
3339 /* rely on refcount_sub from sock_wfree() */
3340 smp_mb__after_atomic();
3341 if (wq && waitqueue_active(&wq->wait))
3342 wake_up_interruptible_sync_poll(&wq->wait, EPOLLOUT |
3343 EPOLLWRNORM | EPOLLWRBAND);
3344
3345 /* Should agree with poll, otherwise some programs break */
3346 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
3347 }
3348}
3349
3350static void sock_def_destruct(struct sock *sk)
3351{
3352}
3353
3354void sk_send_sigurg(struct sock *sk)
3355{
3356 if (sk->sk_socket && sk->sk_socket->file)
3357 if (send_sigurg(&sk->sk_socket->file->f_owner))
3358 sk_wake_async(sk, SOCK_WAKE_URG, POLL_PRI);
3359}
3360EXPORT_SYMBOL(sk_send_sigurg);
3361
3362void sk_reset_timer(struct sock *sk, struct timer_list* timer,
3363 unsigned long expires)
3364{
3365 if (!mod_timer(timer, expires))
3366 sock_hold(sk);
3367}
3368EXPORT_SYMBOL(sk_reset_timer);
3369
3370void sk_stop_timer(struct sock *sk, struct timer_list* timer)
3371{
3372 if (del_timer(timer))
3373 __sock_put(sk);
3374}
3375EXPORT_SYMBOL(sk_stop_timer);
3376
3377void sk_stop_timer_sync(struct sock *sk, struct timer_list *timer)
3378{
3379 if (del_timer_sync(timer))
3380 __sock_put(sk);
3381}
3382EXPORT_SYMBOL(sk_stop_timer_sync);
3383
3384void sock_init_data(struct socket *sock, struct sock *sk)
3385{
3386 sk_init_common(sk);
3387 sk->sk_send_head = NULL;
3388
3389 timer_setup(&sk->sk_timer, NULL, 0);
3390
3391 sk->sk_allocation = GFP_KERNEL;
3392 sk->sk_rcvbuf = READ_ONCE(sysctl_rmem_default);
3393 sk->sk_sndbuf = READ_ONCE(sysctl_wmem_default);
3394 sk->sk_state = TCP_CLOSE;
3395 sk->sk_use_task_frag = true;
3396 sk_set_socket(sk, sock);
3397
3398 sock_set_flag(sk, SOCK_ZAPPED);
3399
3400 if (sock) {
3401 sk->sk_type = sock->type;
3402 RCU_INIT_POINTER(sk->sk_wq, &sock->wq);
3403 sock->sk = sk;
3404 sk->sk_uid = SOCK_INODE(sock)->i_uid;
3405 } else {
3406 RCU_INIT_POINTER(sk->sk_wq, NULL);
3407 sk->sk_uid = make_kuid(sock_net(sk)->user_ns, 0);
3408 }
3409
3410 rwlock_init(&sk->sk_callback_lock);
3411 if (sk->sk_kern_sock)
3412 lockdep_set_class_and_name(
3413 &sk->sk_callback_lock,
3414 af_kern_callback_keys + sk->sk_family,
3415 af_family_kern_clock_key_strings[sk->sk_family]);
3416 else
3417 lockdep_set_class_and_name(
3418 &sk->sk_callback_lock,
3419 af_callback_keys + sk->sk_family,
3420 af_family_clock_key_strings[sk->sk_family]);
3421
3422 sk->sk_state_change = sock_def_wakeup;
3423 sk->sk_data_ready = sock_def_readable;
3424 sk->sk_write_space = sock_def_write_space;
3425 sk->sk_error_report = sock_def_error_report;
3426 sk->sk_destruct = sock_def_destruct;
3427
3428 sk->sk_frag.page = NULL;
3429 sk->sk_frag.offset = 0;
3430 sk->sk_peek_off = -1;
3431
3432 sk->sk_peer_pid = NULL;
3433 sk->sk_peer_cred = NULL;
3434 spin_lock_init(&sk->sk_peer_lock);
3435
3436 sk->sk_write_pending = 0;
3437 sk->sk_rcvlowat = 1;
3438 sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT;
3439 sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT;
3440
3441 sk->sk_stamp = SK_DEFAULT_STAMP;
3442#if BITS_PER_LONG==32
3443 seqlock_init(&sk->sk_stamp_seq);
3444#endif
3445 atomic_set(&sk->sk_zckey, 0);
3446
3447#ifdef CONFIG_NET_RX_BUSY_POLL
3448 sk->sk_napi_id = 0;
3449 sk->sk_ll_usec = READ_ONCE(sysctl_net_busy_read);
3450#endif
3451
3452 sk->sk_max_pacing_rate = ~0UL;
3453 sk->sk_pacing_rate = ~0UL;
3454 WRITE_ONCE(sk->sk_pacing_shift, 10);
3455 sk->sk_incoming_cpu = -1;
3456
3457 sk_rx_queue_clear(sk);
3458 /*
3459 * Before updating sk_refcnt, we must commit prior changes to memory
3460 * (Documentation/RCU/rculist_nulls.rst for details)
3461 */
3462 smp_wmb();
3463 refcount_set(&sk->sk_refcnt, 1);
3464 atomic_set(&sk->sk_drops, 0);
3465}
3466EXPORT_SYMBOL(sock_init_data);
3467
3468void lock_sock_nested(struct sock *sk, int subclass)
3469{
3470 /* The sk_lock has mutex_lock() semantics here. */
3471 mutex_acquire(&sk->sk_lock.dep_map, subclass, 0, _RET_IP_);
3472
3473 might_sleep();
3474 spin_lock_bh(&sk->sk_lock.slock);
3475 if (sock_owned_by_user_nocheck(sk))
3476 __lock_sock(sk);
3477 sk->sk_lock.owned = 1;
3478 spin_unlock_bh(&sk->sk_lock.slock);
3479}
3480EXPORT_SYMBOL(lock_sock_nested);
3481
3482void release_sock(struct sock *sk)
3483{
3484 spin_lock_bh(&sk->sk_lock.slock);
3485 if (sk->sk_backlog.tail)
3486 __release_sock(sk);
3487
3488 /* Warning : release_cb() might need to release sk ownership,
3489 * ie call sock_release_ownership(sk) before us.
3490 */
3491 if (sk->sk_prot->release_cb)
3492 sk->sk_prot->release_cb(sk);
3493
3494 sock_release_ownership(sk);
3495 if (waitqueue_active(&sk->sk_lock.wq))
3496 wake_up(&sk->sk_lock.wq);
3497 spin_unlock_bh(&sk->sk_lock.slock);
3498}
3499EXPORT_SYMBOL(release_sock);
3500
3501bool __lock_sock_fast(struct sock *sk) __acquires(&sk->sk_lock.slock)
3502{
3503 might_sleep();
3504 spin_lock_bh(&sk->sk_lock.slock);
3505
3506 if (!sock_owned_by_user_nocheck(sk)) {
3507 /*
3508 * Fast path return with bottom halves disabled and
3509 * sock::sk_lock.slock held.
3510 *
3511 * The 'mutex' is not contended and holding
3512 * sock::sk_lock.slock prevents all other lockers to
3513 * proceed so the corresponding unlock_sock_fast() can
3514 * avoid the slow path of release_sock() completely and
3515 * just release slock.
3516 *
3517 * From a semantical POV this is equivalent to 'acquiring'
3518 * the 'mutex', hence the corresponding lockdep
3519 * mutex_release() has to happen in the fast path of
3520 * unlock_sock_fast().
3521 */
3522 return false;
3523 }
3524
3525 __lock_sock(sk);
3526 sk->sk_lock.owned = 1;
3527 __acquire(&sk->sk_lock.slock);
3528 spin_unlock_bh(&sk->sk_lock.slock);
3529 return true;
3530}
3531EXPORT_SYMBOL(__lock_sock_fast);
3532
3533int sock_gettstamp(struct socket *sock, void __user *userstamp,
3534 bool timeval, bool time32)
3535{
3536 struct sock *sk = sock->sk;
3537 struct timespec64 ts;
3538
3539 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
3540 ts = ktime_to_timespec64(sock_read_timestamp(sk));
3541 if (ts.tv_sec == -1)
3542 return -ENOENT;
3543 if (ts.tv_sec == 0) {
3544 ktime_t kt = ktime_get_real();
3545 sock_write_timestamp(sk, kt);
3546 ts = ktime_to_timespec64(kt);
3547 }
3548
3549 if (timeval)
3550 ts.tv_nsec /= 1000;
3551
3552#ifdef CONFIG_COMPAT_32BIT_TIME
3553 if (time32)
3554 return put_old_timespec32(&ts, userstamp);
3555#endif
3556#ifdef CONFIG_SPARC64
3557 /* beware of padding in sparc64 timeval */
3558 if (timeval && !in_compat_syscall()) {
3559 struct __kernel_old_timeval __user tv = {
3560 .tv_sec = ts.tv_sec,
3561 .tv_usec = ts.tv_nsec,
3562 };
3563 if (copy_to_user(userstamp, &tv, sizeof(tv)))
3564 return -EFAULT;
3565 return 0;
3566 }
3567#endif
3568 return put_timespec64(&ts, userstamp);
3569}
3570EXPORT_SYMBOL(sock_gettstamp);
3571
3572void sock_enable_timestamp(struct sock *sk, enum sock_flags flag)
3573{
3574 if (!sock_flag(sk, flag)) {
3575 unsigned long previous_flags = sk->sk_flags;
3576
3577 sock_set_flag(sk, flag);
3578 /*
3579 * we just set one of the two flags which require net
3580 * time stamping, but time stamping might have been on
3581 * already because of the other one
3582 */
3583 if (sock_needs_netstamp(sk) &&
3584 !(previous_flags & SK_FLAGS_TIMESTAMP))
3585 net_enable_timestamp();
3586 }
3587}
3588
3589int sock_recv_errqueue(struct sock *sk, struct msghdr *msg, int len,
3590 int level, int type)
3591{
3592 struct sock_exterr_skb *serr;
3593 struct sk_buff *skb;
3594 int copied, err;
3595
3596 err = -EAGAIN;
3597 skb = sock_dequeue_err_skb(sk);
3598 if (skb == NULL)
3599 goto out;
3600
3601 copied = skb->len;
3602 if (copied > len) {
3603 msg->msg_flags |= MSG_TRUNC;
3604 copied = len;
3605 }
3606 err = skb_copy_datagram_msg(skb, 0, msg, copied);
3607 if (err)
3608 goto out_free_skb;
3609
3610 sock_recv_timestamp(msg, sk, skb);
3611
3612 serr = SKB_EXT_ERR(skb);
3613 put_cmsg(msg, level, type, sizeof(serr->ee), &serr->ee);
3614
3615 msg->msg_flags |= MSG_ERRQUEUE;
3616 err = copied;
3617
3618out_free_skb:
3619 kfree_skb(skb);
3620out:
3621 return err;
3622}
3623EXPORT_SYMBOL(sock_recv_errqueue);
3624
3625/*
3626 * Get a socket option on an socket.
3627 *
3628 * FIX: POSIX 1003.1g is very ambiguous here. It states that
3629 * asynchronous errors should be reported by getsockopt. We assume
3630 * this means if you specify SO_ERROR (otherwise whats the point of it).
3631 */
3632int sock_common_getsockopt(struct socket *sock, int level, int optname,
3633 char __user *optval, int __user *optlen)
3634{
3635 struct sock *sk = sock->sk;
3636
3637 /* IPV6_ADDRFORM can change sk->sk_prot under us. */
3638 return READ_ONCE(sk->sk_prot)->getsockopt(sk, level, optname, optval, optlen);
3639}
3640EXPORT_SYMBOL(sock_common_getsockopt);
3641
3642int sock_common_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
3643 int flags)
3644{
3645 struct sock *sk = sock->sk;
3646 int addr_len = 0;
3647 int err;
3648
3649 err = sk->sk_prot->recvmsg(sk, msg, size, flags, &addr_len);
3650 if (err >= 0)
3651 msg->msg_namelen = addr_len;
3652 return err;
3653}
3654EXPORT_SYMBOL(sock_common_recvmsg);
3655
3656/*
3657 * Set socket options on an inet socket.
3658 */
3659int sock_common_setsockopt(struct socket *sock, int level, int optname,
3660 sockptr_t optval, unsigned int optlen)
3661{
3662 struct sock *sk = sock->sk;
3663
3664 /* IPV6_ADDRFORM can change sk->sk_prot under us. */
3665 return READ_ONCE(sk->sk_prot)->setsockopt(sk, level, optname, optval, optlen);
3666}
3667EXPORT_SYMBOL(sock_common_setsockopt);
3668
3669void sk_common_release(struct sock *sk)
3670{
3671 if (sk->sk_prot->destroy)
3672 sk->sk_prot->destroy(sk);
3673
3674 /*
3675 * Observation: when sk_common_release is called, processes have
3676 * no access to socket. But net still has.
3677 * Step one, detach it from networking:
3678 *
3679 * A. Remove from hash tables.
3680 */
3681
3682 sk->sk_prot->unhash(sk);
3683
3684 /*
3685 * In this point socket cannot receive new packets, but it is possible
3686 * that some packets are in flight because some CPU runs receiver and
3687 * did hash table lookup before we unhashed socket. They will achieve
3688 * receive queue and will be purged by socket destructor.
3689 *
3690 * Also we still have packets pending on receive queue and probably,
3691 * our own packets waiting in device queues. sock_destroy will drain
3692 * receive queue, but transmitted packets will delay socket destruction
3693 * until the last reference will be released.
3694 */
3695
3696 sock_orphan(sk);
3697
3698 xfrm_sk_free_policy(sk);
3699
3700 sk_refcnt_debug_release(sk);
3701
3702 sock_put(sk);
3703}
3704EXPORT_SYMBOL(sk_common_release);
3705
3706void sk_get_meminfo(const struct sock *sk, u32 *mem)
3707{
3708 memset(mem, 0, sizeof(*mem) * SK_MEMINFO_VARS);
3709
3710 mem[SK_MEMINFO_RMEM_ALLOC] = sk_rmem_alloc_get(sk);
3711 mem[SK_MEMINFO_RCVBUF] = READ_ONCE(sk->sk_rcvbuf);
3712 mem[SK_MEMINFO_WMEM_ALLOC] = sk_wmem_alloc_get(sk);
3713 mem[SK_MEMINFO_SNDBUF] = READ_ONCE(sk->sk_sndbuf);
3714 mem[SK_MEMINFO_FWD_ALLOC] = sk->sk_forward_alloc;
3715 mem[SK_MEMINFO_WMEM_QUEUED] = READ_ONCE(sk->sk_wmem_queued);
3716 mem[SK_MEMINFO_OPTMEM] = atomic_read(&sk->sk_omem_alloc);
3717 mem[SK_MEMINFO_BACKLOG] = READ_ONCE(sk->sk_backlog.len);
3718 mem[SK_MEMINFO_DROPS] = atomic_read(&sk->sk_drops);
3719}
3720
3721#ifdef CONFIG_PROC_FS
3722static DECLARE_BITMAP(proto_inuse_idx, PROTO_INUSE_NR);
3723
3724int sock_prot_inuse_get(struct net *net, struct proto *prot)
3725{
3726 int cpu, idx = prot->inuse_idx;
3727 int res = 0;
3728
3729 for_each_possible_cpu(cpu)
3730 res += per_cpu_ptr(net->core.prot_inuse, cpu)->val[idx];
3731
3732 return res >= 0 ? res : 0;
3733}
3734EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
3735
3736int sock_inuse_get(struct net *net)
3737{
3738 int cpu, res = 0;
3739
3740 for_each_possible_cpu(cpu)
3741 res += per_cpu_ptr(net->core.prot_inuse, cpu)->all;
3742
3743 return res;
3744}
3745
3746EXPORT_SYMBOL_GPL(sock_inuse_get);
3747
3748static int __net_init sock_inuse_init_net(struct net *net)
3749{
3750 net->core.prot_inuse = alloc_percpu(struct prot_inuse);
3751 if (net->core.prot_inuse == NULL)
3752 return -ENOMEM;
3753 return 0;
3754}
3755
3756static void __net_exit sock_inuse_exit_net(struct net *net)
3757{
3758 free_percpu(net->core.prot_inuse);
3759}
3760
3761static struct pernet_operations net_inuse_ops = {
3762 .init = sock_inuse_init_net,
3763 .exit = sock_inuse_exit_net,
3764};
3765
3766static __init int net_inuse_init(void)
3767{
3768 if (register_pernet_subsys(&net_inuse_ops))
3769 panic("Cannot initialize net inuse counters");
3770
3771 return 0;
3772}
3773
3774core_initcall(net_inuse_init);
3775
3776static int assign_proto_idx(struct proto *prot)
3777{
3778 prot->inuse_idx = find_first_zero_bit(proto_inuse_idx, PROTO_INUSE_NR);
3779
3780 if (unlikely(prot->inuse_idx == PROTO_INUSE_NR - 1)) {
3781 pr_err("PROTO_INUSE_NR exhausted\n");
3782 return -ENOSPC;
3783 }
3784
3785 set_bit(prot->inuse_idx, proto_inuse_idx);
3786 return 0;
3787}
3788
3789static void release_proto_idx(struct proto *prot)
3790{
3791 if (prot->inuse_idx != PROTO_INUSE_NR - 1)
3792 clear_bit(prot->inuse_idx, proto_inuse_idx);
3793}
3794#else
3795static inline int assign_proto_idx(struct proto *prot)
3796{
3797 return 0;
3798}
3799
3800static inline void release_proto_idx(struct proto *prot)
3801{
3802}
3803
3804#endif
3805
3806static void tw_prot_cleanup(struct timewait_sock_ops *twsk_prot)
3807{
3808 if (!twsk_prot)
3809 return;
3810 kfree(twsk_prot->twsk_slab_name);
3811 twsk_prot->twsk_slab_name = NULL;
3812 kmem_cache_destroy(twsk_prot->twsk_slab);
3813 twsk_prot->twsk_slab = NULL;
3814}
3815
3816static int tw_prot_init(const struct proto *prot)
3817{
3818 struct timewait_sock_ops *twsk_prot = prot->twsk_prot;
3819
3820 if (!twsk_prot)
3821 return 0;
3822
3823 twsk_prot->twsk_slab_name = kasprintf(GFP_KERNEL, "tw_sock_%s",
3824 prot->name);
3825 if (!twsk_prot->twsk_slab_name)
3826 return -ENOMEM;
3827
3828 twsk_prot->twsk_slab =
3829 kmem_cache_create(twsk_prot->twsk_slab_name,
3830 twsk_prot->twsk_obj_size, 0,
3831 SLAB_ACCOUNT | prot->slab_flags,
3832 NULL);
3833 if (!twsk_prot->twsk_slab) {
3834 pr_crit("%s: Can't create timewait sock SLAB cache!\n",
3835 prot->name);
3836 return -ENOMEM;
3837 }
3838
3839 return 0;
3840}
3841
3842static void req_prot_cleanup(struct request_sock_ops *rsk_prot)
3843{
3844 if (!rsk_prot)
3845 return;
3846 kfree(rsk_prot->slab_name);
3847 rsk_prot->slab_name = NULL;
3848 kmem_cache_destroy(rsk_prot->slab);
3849 rsk_prot->slab = NULL;
3850}
3851
3852static int req_prot_init(const struct proto *prot)
3853{
3854 struct request_sock_ops *rsk_prot = prot->rsk_prot;
3855
3856 if (!rsk_prot)
3857 return 0;
3858
3859 rsk_prot->slab_name = kasprintf(GFP_KERNEL, "request_sock_%s",
3860 prot->name);
3861 if (!rsk_prot->slab_name)
3862 return -ENOMEM;
3863
3864 rsk_prot->slab = kmem_cache_create(rsk_prot->slab_name,
3865 rsk_prot->obj_size, 0,
3866 SLAB_ACCOUNT | prot->slab_flags,
3867 NULL);
3868
3869 if (!rsk_prot->slab) {
3870 pr_crit("%s: Can't create request sock SLAB cache!\n",
3871 prot->name);
3872 return -ENOMEM;
3873 }
3874 return 0;
3875}
3876
3877int proto_register(struct proto *prot, int alloc_slab)
3878{
3879 int ret = -ENOBUFS;
3880
3881 if (prot->memory_allocated && !prot->sysctl_mem) {
3882 pr_err("%s: missing sysctl_mem\n", prot->name);
3883 return -EINVAL;
3884 }
3885 if (prot->memory_allocated && !prot->per_cpu_fw_alloc) {
3886 pr_err("%s: missing per_cpu_fw_alloc\n", prot->name);
3887 return -EINVAL;
3888 }
3889 if (alloc_slab) {
3890 prot->slab = kmem_cache_create_usercopy(prot->name,
3891 prot->obj_size, 0,
3892 SLAB_HWCACHE_ALIGN | SLAB_ACCOUNT |
3893 prot->slab_flags,
3894 prot->useroffset, prot->usersize,
3895 NULL);
3896
3897 if (prot->slab == NULL) {
3898 pr_crit("%s: Can't create sock SLAB cache!\n",
3899 prot->name);
3900 goto out;
3901 }
3902
3903 if (req_prot_init(prot))
3904 goto out_free_request_sock_slab;
3905
3906 if (tw_prot_init(prot))
3907 goto out_free_timewait_sock_slab;
3908 }
3909
3910 mutex_lock(&proto_list_mutex);
3911 ret = assign_proto_idx(prot);
3912 if (ret) {
3913 mutex_unlock(&proto_list_mutex);
3914 goto out_free_timewait_sock_slab;
3915 }
3916 list_add(&prot->node, &proto_list);
3917 mutex_unlock(&proto_list_mutex);
3918 return ret;
3919
3920out_free_timewait_sock_slab:
3921 if (alloc_slab)
3922 tw_prot_cleanup(prot->twsk_prot);
3923out_free_request_sock_slab:
3924 if (alloc_slab) {
3925 req_prot_cleanup(prot->rsk_prot);
3926
3927 kmem_cache_destroy(prot->slab);
3928 prot->slab = NULL;
3929 }
3930out:
3931 return ret;
3932}
3933EXPORT_SYMBOL(proto_register);
3934
3935void proto_unregister(struct proto *prot)
3936{
3937 mutex_lock(&proto_list_mutex);
3938 release_proto_idx(prot);
3939 list_del(&prot->node);
3940 mutex_unlock(&proto_list_mutex);
3941
3942 kmem_cache_destroy(prot->slab);
3943 prot->slab = NULL;
3944
3945 req_prot_cleanup(prot->rsk_prot);
3946 tw_prot_cleanup(prot->twsk_prot);
3947}
3948EXPORT_SYMBOL(proto_unregister);
3949
3950int sock_load_diag_module(int family, int protocol)
3951{
3952 if (!protocol) {
3953 if (!sock_is_registered(family))
3954 return -ENOENT;
3955
3956 return request_module("net-pf-%d-proto-%d-type-%d", PF_NETLINK,
3957 NETLINK_SOCK_DIAG, family);
3958 }
3959
3960#ifdef CONFIG_INET
3961 if (family == AF_INET &&
3962 protocol != IPPROTO_RAW &&
3963 protocol < MAX_INET_PROTOS &&
3964 !rcu_access_pointer(inet_protos[protocol]))
3965 return -ENOENT;
3966#endif
3967
3968 return request_module("net-pf-%d-proto-%d-type-%d-%d", PF_NETLINK,
3969 NETLINK_SOCK_DIAG, family, protocol);
3970}
3971EXPORT_SYMBOL(sock_load_diag_module);
3972
3973#ifdef CONFIG_PROC_FS
3974static void *proto_seq_start(struct seq_file *seq, loff_t *pos)
3975 __acquires(proto_list_mutex)
3976{
3977 mutex_lock(&proto_list_mutex);
3978 return seq_list_start_head(&proto_list, *pos);
3979}
3980
3981static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3982{
3983 return seq_list_next(v, &proto_list, pos);
3984}
3985
3986static void proto_seq_stop(struct seq_file *seq, void *v)
3987 __releases(proto_list_mutex)
3988{
3989 mutex_unlock(&proto_list_mutex);
3990}
3991
3992static char proto_method_implemented(const void *method)
3993{
3994 return method == NULL ? 'n' : 'y';
3995}
3996static long sock_prot_memory_allocated(struct proto *proto)
3997{
3998 return proto->memory_allocated != NULL ? proto_memory_allocated(proto) : -1L;
3999}
4000
4001static const char *sock_prot_memory_pressure(struct proto *proto)
4002{
4003 return proto->memory_pressure != NULL ?
4004 proto_memory_pressure(proto) ? "yes" : "no" : "NI";
4005}
4006
4007static void proto_seq_printf(struct seq_file *seq, struct proto *proto)
4008{
4009
4010 seq_printf(seq, "%-9s %4u %6d %6ld %-3s %6u %-3s %-10s "
4011 "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n",
4012 proto->name,
4013 proto->obj_size,
4014 sock_prot_inuse_get(seq_file_net(seq), proto),
4015 sock_prot_memory_allocated(proto),
4016 sock_prot_memory_pressure(proto),
4017 proto->max_header,
4018 proto->slab == NULL ? "no" : "yes",
4019 module_name(proto->owner),
4020 proto_method_implemented(proto->close),
4021 proto_method_implemented(proto->connect),
4022 proto_method_implemented(proto->disconnect),
4023 proto_method_implemented(proto->accept),
4024 proto_method_implemented(proto->ioctl),
4025 proto_method_implemented(proto->init),
4026 proto_method_implemented(proto->destroy),
4027 proto_method_implemented(proto->shutdown),
4028 proto_method_implemented(proto->setsockopt),
4029 proto_method_implemented(proto->getsockopt),
4030 proto_method_implemented(proto->sendmsg),
4031 proto_method_implemented(proto->recvmsg),
4032 proto_method_implemented(proto->sendpage),
4033 proto_method_implemented(proto->bind),
4034 proto_method_implemented(proto->backlog_rcv),
4035 proto_method_implemented(proto->hash),
4036 proto_method_implemented(proto->unhash),
4037 proto_method_implemented(proto->get_port),
4038 proto_method_implemented(proto->enter_memory_pressure));
4039}
4040
4041static int proto_seq_show(struct seq_file *seq, void *v)
4042{
4043 if (v == &proto_list)
4044 seq_printf(seq, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s",
4045 "protocol",
4046 "size",
4047 "sockets",
4048 "memory",
4049 "press",
4050 "maxhdr",
4051 "slab",
4052 "module",
4053 "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n");
4054 else
4055 proto_seq_printf(seq, list_entry(v, struct proto, node));
4056 return 0;
4057}
4058
4059static const struct seq_operations proto_seq_ops = {
4060 .start = proto_seq_start,
4061 .next = proto_seq_next,
4062 .stop = proto_seq_stop,
4063 .show = proto_seq_show,
4064};
4065
4066static __net_init int proto_init_net(struct net *net)
4067{
4068 if (!proc_create_net("protocols", 0444, net->proc_net, &proto_seq_ops,
4069 sizeof(struct seq_net_private)))
4070 return -ENOMEM;
4071
4072 return 0;
4073}
4074
4075static __net_exit void proto_exit_net(struct net *net)
4076{
4077 remove_proc_entry("protocols", net->proc_net);
4078}
4079
4080
4081static __net_initdata struct pernet_operations proto_net_ops = {
4082 .init = proto_init_net,
4083 .exit = proto_exit_net,
4084};
4085
4086static int __init proto_init(void)
4087{
4088 return register_pernet_subsys(&proto_net_ops);
4089}
4090
4091subsys_initcall(proto_init);
4092
4093#endif /* PROC_FS */
4094
4095#ifdef CONFIG_NET_RX_BUSY_POLL
4096bool sk_busy_loop_end(void *p, unsigned long start_time)
4097{
4098 struct sock *sk = p;
4099
4100 return !skb_queue_empty_lockless(&sk->sk_receive_queue) ||
4101 sk_busy_loop_timeout(sk, start_time);
4102}
4103EXPORT_SYMBOL(sk_busy_loop_end);
4104#endif /* CONFIG_NET_RX_BUSY_POLL */
4105
4106int sock_bind_add(struct sock *sk, struct sockaddr *addr, int addr_len)
4107{
4108 if (!sk->sk_prot->bind_add)
4109 return -EOPNOTSUPP;
4110 return sk->sk_prot->bind_add(sk, addr, addr_len);
4111}
4112EXPORT_SYMBOL(sock_bind_add);