Loading...
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
142static DEFINE_MUTEX(proto_list_mutex);
143static LIST_HEAD(proto_list);
144
145static void sock_inuse_add(struct net *net, int val);
146
147/**
148 * sk_ns_capable - General socket capability test
149 * @sk: Socket to use a capability on or through
150 * @user_ns: The user namespace of the capability to use
151 * @cap: The capability to use
152 *
153 * Test to see if the opener of the socket had when the socket was
154 * created and the current process has the capability @cap in the user
155 * namespace @user_ns.
156 */
157bool sk_ns_capable(const struct sock *sk,
158 struct user_namespace *user_ns, int cap)
159{
160 return file_ns_capable(sk->sk_socket->file, user_ns, cap) &&
161 ns_capable(user_ns, cap);
162}
163EXPORT_SYMBOL(sk_ns_capable);
164
165/**
166 * sk_capable - Socket global capability test
167 * @sk: Socket to use a capability on or through
168 * @cap: The global capability to use
169 *
170 * Test to see if the opener of the socket had when the socket was
171 * created and the current process has the capability @cap in all user
172 * namespaces.
173 */
174bool sk_capable(const struct sock *sk, int cap)
175{
176 return sk_ns_capable(sk, &init_user_ns, cap);
177}
178EXPORT_SYMBOL(sk_capable);
179
180/**
181 * sk_net_capable - Network namespace socket capability test
182 * @sk: Socket to use a capability on or through
183 * @cap: The capability to use
184 *
185 * Test to see if the opener of the socket had when the socket was created
186 * and the current process has the capability @cap over the network namespace
187 * the socket is a member of.
188 */
189bool sk_net_capable(const struct sock *sk, int cap)
190{
191 return sk_ns_capable(sk, sock_net(sk)->user_ns, cap);
192}
193EXPORT_SYMBOL(sk_net_capable);
194
195/*
196 * Each address family might have different locking rules, so we have
197 * one slock key per address family and separate keys for internal and
198 * userspace sockets.
199 */
200static struct lock_class_key af_family_keys[AF_MAX];
201static struct lock_class_key af_family_kern_keys[AF_MAX];
202static struct lock_class_key af_family_slock_keys[AF_MAX];
203static struct lock_class_key af_family_kern_slock_keys[AF_MAX];
204
205/*
206 * Make lock validator output more readable. (we pre-construct these
207 * strings build-time, so that runtime initialization of socket
208 * locks is fast):
209 */
210
211#define _sock_locks(x) \
212 x "AF_UNSPEC", x "AF_UNIX" , x "AF_INET" , \
213 x "AF_AX25" , x "AF_IPX" , x "AF_APPLETALK", \
214 x "AF_NETROM", x "AF_BRIDGE" , x "AF_ATMPVC" , \
215 x "AF_X25" , x "AF_INET6" , x "AF_ROSE" , \
216 x "AF_DECnet", x "AF_NETBEUI" , x "AF_SECURITY" , \
217 x "AF_KEY" , x "AF_NETLINK" , x "AF_PACKET" , \
218 x "AF_ASH" , x "AF_ECONET" , x "AF_ATMSVC" , \
219 x "AF_RDS" , x "AF_SNA" , x "AF_IRDA" , \
220 x "AF_PPPOX" , x "AF_WANPIPE" , x "AF_LLC" , \
221 x "27" , x "28" , x "AF_CAN" , \
222 x "AF_TIPC" , x "AF_BLUETOOTH", x "IUCV" , \
223 x "AF_RXRPC" , x "AF_ISDN" , x "AF_PHONET" , \
224 x "AF_IEEE802154", x "AF_CAIF" , x "AF_ALG" , \
225 x "AF_NFC" , x "AF_VSOCK" , x "AF_KCM" , \
226 x "AF_QIPCRTR", x "AF_SMC" , x "AF_XDP" , \
227 x "AF_MAX"
228
229static const char *const af_family_key_strings[AF_MAX+1] = {
230 _sock_locks("sk_lock-")
231};
232static const char *const af_family_slock_key_strings[AF_MAX+1] = {
233 _sock_locks("slock-")
234};
235static const char *const af_family_clock_key_strings[AF_MAX+1] = {
236 _sock_locks("clock-")
237};
238
239static const char *const af_family_kern_key_strings[AF_MAX+1] = {
240 _sock_locks("k-sk_lock-")
241};
242static const char *const af_family_kern_slock_key_strings[AF_MAX+1] = {
243 _sock_locks("k-slock-")
244};
245static const char *const af_family_kern_clock_key_strings[AF_MAX+1] = {
246 _sock_locks("k-clock-")
247};
248static const char *const af_family_rlock_key_strings[AF_MAX+1] = {
249 _sock_locks("rlock-")
250};
251static const char *const af_family_wlock_key_strings[AF_MAX+1] = {
252 _sock_locks("wlock-")
253};
254static const char *const af_family_elock_key_strings[AF_MAX+1] = {
255 _sock_locks("elock-")
256};
257
258/*
259 * sk_callback_lock and sk queues locking rules are per-address-family,
260 * so split the lock classes by using a per-AF key:
261 */
262static struct lock_class_key af_callback_keys[AF_MAX];
263static struct lock_class_key af_rlock_keys[AF_MAX];
264static struct lock_class_key af_wlock_keys[AF_MAX];
265static struct lock_class_key af_elock_keys[AF_MAX];
266static struct lock_class_key af_kern_callback_keys[AF_MAX];
267
268/* Run time adjustable parameters. */
269__u32 sysctl_wmem_max __read_mostly = SK_WMEM_MAX;
270EXPORT_SYMBOL(sysctl_wmem_max);
271__u32 sysctl_rmem_max __read_mostly = SK_RMEM_MAX;
272EXPORT_SYMBOL(sysctl_rmem_max);
273__u32 sysctl_wmem_default __read_mostly = SK_WMEM_MAX;
274__u32 sysctl_rmem_default __read_mostly = SK_RMEM_MAX;
275
276/* Maximal space eaten by iovec or ancillary data plus some space */
277int sysctl_optmem_max __read_mostly = sizeof(unsigned long)*(2*UIO_MAXIOV+512);
278EXPORT_SYMBOL(sysctl_optmem_max);
279
280int sysctl_tstamp_allow_data __read_mostly = 1;
281
282DEFINE_STATIC_KEY_FALSE(memalloc_socks_key);
283EXPORT_SYMBOL_GPL(memalloc_socks_key);
284
285/**
286 * sk_set_memalloc - sets %SOCK_MEMALLOC
287 * @sk: socket to set it on
288 *
289 * Set %SOCK_MEMALLOC on a socket for access to emergency reserves.
290 * It's the responsibility of the admin to adjust min_free_kbytes
291 * to meet the requirements
292 */
293void sk_set_memalloc(struct sock *sk)
294{
295 sock_set_flag(sk, SOCK_MEMALLOC);
296 sk->sk_allocation |= __GFP_MEMALLOC;
297 static_branch_inc(&memalloc_socks_key);
298}
299EXPORT_SYMBOL_GPL(sk_set_memalloc);
300
301void sk_clear_memalloc(struct sock *sk)
302{
303 sock_reset_flag(sk, SOCK_MEMALLOC);
304 sk->sk_allocation &= ~__GFP_MEMALLOC;
305 static_branch_dec(&memalloc_socks_key);
306
307 /*
308 * SOCK_MEMALLOC is allowed to ignore rmem limits to ensure forward
309 * progress of swapping. SOCK_MEMALLOC may be cleared while
310 * it has rmem allocations due to the last swapfile being deactivated
311 * but there is a risk that the socket is unusable due to exceeding
312 * the rmem limits. Reclaim the reserves and obey rmem limits again.
313 */
314 sk_mem_reclaim(sk);
315}
316EXPORT_SYMBOL_GPL(sk_clear_memalloc);
317
318int __sk_backlog_rcv(struct sock *sk, struct sk_buff *skb)
319{
320 int ret;
321 unsigned int noreclaim_flag;
322
323 /* these should have been dropped before queueing */
324 BUG_ON(!sock_flag(sk, SOCK_MEMALLOC));
325
326 noreclaim_flag = memalloc_noreclaim_save();
327 ret = sk->sk_backlog_rcv(sk, skb);
328 memalloc_noreclaim_restore(noreclaim_flag);
329
330 return ret;
331}
332EXPORT_SYMBOL(__sk_backlog_rcv);
333
334static int sock_get_timeout(long timeo, void *optval, bool old_timeval)
335{
336 struct __kernel_sock_timeval tv;
337
338 if (timeo == MAX_SCHEDULE_TIMEOUT) {
339 tv.tv_sec = 0;
340 tv.tv_usec = 0;
341 } else {
342 tv.tv_sec = timeo / HZ;
343 tv.tv_usec = ((timeo % HZ) * USEC_PER_SEC) / HZ;
344 }
345
346 if (old_timeval && in_compat_syscall() && !COMPAT_USE_64BIT_TIME) {
347 struct old_timeval32 tv32 = { tv.tv_sec, tv.tv_usec };
348 *(struct old_timeval32 *)optval = tv32;
349 return sizeof(tv32);
350 }
351
352 if (old_timeval) {
353 struct __kernel_old_timeval old_tv;
354 old_tv.tv_sec = tv.tv_sec;
355 old_tv.tv_usec = tv.tv_usec;
356 *(struct __kernel_old_timeval *)optval = old_tv;
357 return sizeof(old_tv);
358 }
359
360 *(struct __kernel_sock_timeval *)optval = tv;
361 return sizeof(tv);
362}
363
364static int sock_set_timeout(long *timeo_p, sockptr_t optval, int optlen,
365 bool old_timeval)
366{
367 struct __kernel_sock_timeval tv;
368
369 if (old_timeval && in_compat_syscall() && !COMPAT_USE_64BIT_TIME) {
370 struct old_timeval32 tv32;
371
372 if (optlen < sizeof(tv32))
373 return -EINVAL;
374
375 if (copy_from_sockptr(&tv32, optval, sizeof(tv32)))
376 return -EFAULT;
377 tv.tv_sec = tv32.tv_sec;
378 tv.tv_usec = tv32.tv_usec;
379 } else if (old_timeval) {
380 struct __kernel_old_timeval old_tv;
381
382 if (optlen < sizeof(old_tv))
383 return -EINVAL;
384 if (copy_from_sockptr(&old_tv, optval, sizeof(old_tv)))
385 return -EFAULT;
386 tv.tv_sec = old_tv.tv_sec;
387 tv.tv_usec = old_tv.tv_usec;
388 } else {
389 if (optlen < sizeof(tv))
390 return -EINVAL;
391 if (copy_from_sockptr(&tv, optval, sizeof(tv)))
392 return -EFAULT;
393 }
394 if (tv.tv_usec < 0 || tv.tv_usec >= USEC_PER_SEC)
395 return -EDOM;
396
397 if (tv.tv_sec < 0) {
398 static int warned __read_mostly;
399
400 *timeo_p = 0;
401 if (warned < 10 && net_ratelimit()) {
402 warned++;
403 pr_info("%s: `%s' (pid %d) tries to set negative timeout\n",
404 __func__, current->comm, task_pid_nr(current));
405 }
406 return 0;
407 }
408 *timeo_p = MAX_SCHEDULE_TIMEOUT;
409 if (tv.tv_sec == 0 && tv.tv_usec == 0)
410 return 0;
411 if (tv.tv_sec < (MAX_SCHEDULE_TIMEOUT / HZ - 1))
412 *timeo_p = tv.tv_sec * HZ + DIV_ROUND_UP((unsigned long)tv.tv_usec, USEC_PER_SEC / HZ);
413 return 0;
414}
415
416static void sock_warn_obsolete_bsdism(const char *name)
417{
418 static int warned;
419 static char warncomm[TASK_COMM_LEN];
420 if (strcmp(warncomm, current->comm) && warned < 5) {
421 strcpy(warncomm, current->comm);
422 pr_warn("process `%s' is using obsolete %s SO_BSDCOMPAT\n",
423 warncomm, name);
424 warned++;
425 }
426}
427
428static bool sock_needs_netstamp(const struct sock *sk)
429{
430 switch (sk->sk_family) {
431 case AF_UNSPEC:
432 case AF_UNIX:
433 return false;
434 default:
435 return true;
436 }
437}
438
439static void sock_disable_timestamp(struct sock *sk, unsigned long flags)
440{
441 if (sk->sk_flags & flags) {
442 sk->sk_flags &= ~flags;
443 if (sock_needs_netstamp(sk) &&
444 !(sk->sk_flags & SK_FLAGS_TIMESTAMP))
445 net_disable_timestamp();
446 }
447}
448
449
450int __sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
451{
452 unsigned long flags;
453 struct sk_buff_head *list = &sk->sk_receive_queue;
454
455 if (atomic_read(&sk->sk_rmem_alloc) >= sk->sk_rcvbuf) {
456 atomic_inc(&sk->sk_drops);
457 trace_sock_rcvqueue_full(sk, skb);
458 return -ENOMEM;
459 }
460
461 if (!sk_rmem_schedule(sk, skb, skb->truesize)) {
462 atomic_inc(&sk->sk_drops);
463 return -ENOBUFS;
464 }
465
466 skb->dev = NULL;
467 skb_set_owner_r(skb, sk);
468
469 /* we escape from rcu protected region, make sure we dont leak
470 * a norefcounted dst
471 */
472 skb_dst_force(skb);
473
474 spin_lock_irqsave(&list->lock, flags);
475 sock_skb_set_dropcount(sk, skb);
476 __skb_queue_tail(list, skb);
477 spin_unlock_irqrestore(&list->lock, flags);
478
479 if (!sock_flag(sk, SOCK_DEAD))
480 sk->sk_data_ready(sk);
481 return 0;
482}
483EXPORT_SYMBOL(__sock_queue_rcv_skb);
484
485int sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
486{
487 int err;
488
489 err = sk_filter(sk, skb);
490 if (err)
491 return err;
492
493 return __sock_queue_rcv_skb(sk, skb);
494}
495EXPORT_SYMBOL(sock_queue_rcv_skb);
496
497int __sk_receive_skb(struct sock *sk, struct sk_buff *skb,
498 const int nested, unsigned int trim_cap, bool refcounted)
499{
500 int rc = NET_RX_SUCCESS;
501
502 if (sk_filter_trim_cap(sk, skb, trim_cap))
503 goto discard_and_relse;
504
505 skb->dev = NULL;
506
507 if (sk_rcvqueues_full(sk, sk->sk_rcvbuf)) {
508 atomic_inc(&sk->sk_drops);
509 goto discard_and_relse;
510 }
511 if (nested)
512 bh_lock_sock_nested(sk);
513 else
514 bh_lock_sock(sk);
515 if (!sock_owned_by_user(sk)) {
516 /*
517 * trylock + unlock semantics:
518 */
519 mutex_acquire(&sk->sk_lock.dep_map, 0, 1, _RET_IP_);
520
521 rc = sk_backlog_rcv(sk, skb);
522
523 mutex_release(&sk->sk_lock.dep_map, _RET_IP_);
524 } else if (sk_add_backlog(sk, skb, READ_ONCE(sk->sk_rcvbuf))) {
525 bh_unlock_sock(sk);
526 atomic_inc(&sk->sk_drops);
527 goto discard_and_relse;
528 }
529
530 bh_unlock_sock(sk);
531out:
532 if (refcounted)
533 sock_put(sk);
534 return rc;
535discard_and_relse:
536 kfree_skb(skb);
537 goto out;
538}
539EXPORT_SYMBOL(__sk_receive_skb);
540
541struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie)
542{
543 struct dst_entry *dst = __sk_dst_get(sk);
544
545 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
546 sk_tx_queue_clear(sk);
547 sk->sk_dst_pending_confirm = 0;
548 RCU_INIT_POINTER(sk->sk_dst_cache, NULL);
549 dst_release(dst);
550 return NULL;
551 }
552
553 return dst;
554}
555EXPORT_SYMBOL(__sk_dst_check);
556
557struct dst_entry *sk_dst_check(struct sock *sk, u32 cookie)
558{
559 struct dst_entry *dst = sk_dst_get(sk);
560
561 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
562 sk_dst_reset(sk);
563 dst_release(dst);
564 return NULL;
565 }
566
567 return dst;
568}
569EXPORT_SYMBOL(sk_dst_check);
570
571static int sock_bindtoindex_locked(struct sock *sk, int ifindex)
572{
573 int ret = -ENOPROTOOPT;
574#ifdef CONFIG_NETDEVICES
575 struct net *net = sock_net(sk);
576
577 /* Sorry... */
578 ret = -EPERM;
579 if (sk->sk_bound_dev_if && !ns_capable(net->user_ns, CAP_NET_RAW))
580 goto out;
581
582 ret = -EINVAL;
583 if (ifindex < 0)
584 goto out;
585
586 sk->sk_bound_dev_if = ifindex;
587 if (sk->sk_prot->rehash)
588 sk->sk_prot->rehash(sk);
589 sk_dst_reset(sk);
590
591 ret = 0;
592
593out:
594#endif
595
596 return ret;
597}
598
599int sock_bindtoindex(struct sock *sk, int ifindex, bool lock_sk)
600{
601 int ret;
602
603 if (lock_sk)
604 lock_sock(sk);
605 ret = sock_bindtoindex_locked(sk, ifindex);
606 if (lock_sk)
607 release_sock(sk);
608
609 return ret;
610}
611EXPORT_SYMBOL(sock_bindtoindex);
612
613static int sock_setbindtodevice(struct sock *sk, sockptr_t optval, int optlen)
614{
615 int ret = -ENOPROTOOPT;
616#ifdef CONFIG_NETDEVICES
617 struct net *net = sock_net(sk);
618 char devname[IFNAMSIZ];
619 int index;
620
621 ret = -EINVAL;
622 if (optlen < 0)
623 goto out;
624
625 /* Bind this socket to a particular device like "eth0",
626 * as specified in the passed interface name. If the
627 * name is "" or the option length is zero the socket
628 * is not bound.
629 */
630 if (optlen > IFNAMSIZ - 1)
631 optlen = IFNAMSIZ - 1;
632 memset(devname, 0, sizeof(devname));
633
634 ret = -EFAULT;
635 if (copy_from_sockptr(devname, optval, optlen))
636 goto out;
637
638 index = 0;
639 if (devname[0] != '\0') {
640 struct net_device *dev;
641
642 rcu_read_lock();
643 dev = dev_get_by_name_rcu(net, devname);
644 if (dev)
645 index = dev->ifindex;
646 rcu_read_unlock();
647 ret = -ENODEV;
648 if (!dev)
649 goto out;
650 }
651
652 return sock_bindtoindex(sk, index, true);
653out:
654#endif
655
656 return ret;
657}
658
659static int sock_getbindtodevice(struct sock *sk, char __user *optval,
660 int __user *optlen, int len)
661{
662 int ret = -ENOPROTOOPT;
663#ifdef CONFIG_NETDEVICES
664 struct net *net = sock_net(sk);
665 char devname[IFNAMSIZ];
666
667 if (sk->sk_bound_dev_if == 0) {
668 len = 0;
669 goto zero;
670 }
671
672 ret = -EINVAL;
673 if (len < IFNAMSIZ)
674 goto out;
675
676 ret = netdev_get_name(net, devname, sk->sk_bound_dev_if);
677 if (ret)
678 goto out;
679
680 len = strlen(devname) + 1;
681
682 ret = -EFAULT;
683 if (copy_to_user(optval, devname, len))
684 goto out;
685
686zero:
687 ret = -EFAULT;
688 if (put_user(len, optlen))
689 goto out;
690
691 ret = 0;
692
693out:
694#endif
695
696 return ret;
697}
698
699bool sk_mc_loop(struct sock *sk)
700{
701 if (dev_recursion_level())
702 return false;
703 if (!sk)
704 return true;
705 switch (sk->sk_family) {
706 case AF_INET:
707 return inet_sk(sk)->mc_loop;
708#if IS_ENABLED(CONFIG_IPV6)
709 case AF_INET6:
710 return inet6_sk(sk)->mc_loop;
711#endif
712 }
713 WARN_ON_ONCE(1);
714 return true;
715}
716EXPORT_SYMBOL(sk_mc_loop);
717
718void sock_set_reuseaddr(struct sock *sk)
719{
720 lock_sock(sk);
721 sk->sk_reuse = SK_CAN_REUSE;
722 release_sock(sk);
723}
724EXPORT_SYMBOL(sock_set_reuseaddr);
725
726void sock_set_reuseport(struct sock *sk)
727{
728 lock_sock(sk);
729 sk->sk_reuseport = true;
730 release_sock(sk);
731}
732EXPORT_SYMBOL(sock_set_reuseport);
733
734void sock_no_linger(struct sock *sk)
735{
736 lock_sock(sk);
737 sk->sk_lingertime = 0;
738 sock_set_flag(sk, SOCK_LINGER);
739 release_sock(sk);
740}
741EXPORT_SYMBOL(sock_no_linger);
742
743void sock_set_priority(struct sock *sk, u32 priority)
744{
745 lock_sock(sk);
746 sk->sk_priority = priority;
747 release_sock(sk);
748}
749EXPORT_SYMBOL(sock_set_priority);
750
751void sock_set_sndtimeo(struct sock *sk, s64 secs)
752{
753 lock_sock(sk);
754 if (secs && secs < MAX_SCHEDULE_TIMEOUT / HZ - 1)
755 sk->sk_sndtimeo = secs * HZ;
756 else
757 sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT;
758 release_sock(sk);
759}
760EXPORT_SYMBOL(sock_set_sndtimeo);
761
762static void __sock_set_timestamps(struct sock *sk, bool val, bool new, bool ns)
763{
764 if (val) {
765 sock_valbool_flag(sk, SOCK_TSTAMP_NEW, new);
766 sock_valbool_flag(sk, SOCK_RCVTSTAMPNS, ns);
767 sock_set_flag(sk, SOCK_RCVTSTAMP);
768 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
769 } else {
770 sock_reset_flag(sk, SOCK_RCVTSTAMP);
771 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
772 sock_reset_flag(sk, SOCK_TSTAMP_NEW);
773 }
774}
775
776void sock_enable_timestamps(struct sock *sk)
777{
778 lock_sock(sk);
779 __sock_set_timestamps(sk, true, false, true);
780 release_sock(sk);
781}
782EXPORT_SYMBOL(sock_enable_timestamps);
783
784void sock_set_keepalive(struct sock *sk)
785{
786 lock_sock(sk);
787 if (sk->sk_prot->keepalive)
788 sk->sk_prot->keepalive(sk, true);
789 sock_valbool_flag(sk, SOCK_KEEPOPEN, true);
790 release_sock(sk);
791}
792EXPORT_SYMBOL(sock_set_keepalive);
793
794static void __sock_set_rcvbuf(struct sock *sk, int val)
795{
796 /* Ensure val * 2 fits into an int, to prevent max_t() from treating it
797 * as a negative value.
798 */
799 val = min_t(int, val, INT_MAX / 2);
800 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
801
802 /* We double it on the way in to account for "struct sk_buff" etc.
803 * overhead. Applications assume that the SO_RCVBUF setting they make
804 * will allow that much actual data to be received on that socket.
805 *
806 * Applications are unaware that "struct sk_buff" and other overheads
807 * allocate from the receive buffer during socket buffer allocation.
808 *
809 * And after considering the possible alternatives, returning the value
810 * we actually used in getsockopt is the most desirable behavior.
811 */
812 WRITE_ONCE(sk->sk_rcvbuf, max_t(int, val * 2, SOCK_MIN_RCVBUF));
813}
814
815void sock_set_rcvbuf(struct sock *sk, int val)
816{
817 lock_sock(sk);
818 __sock_set_rcvbuf(sk, val);
819 release_sock(sk);
820}
821EXPORT_SYMBOL(sock_set_rcvbuf);
822
823void sock_set_mark(struct sock *sk, u32 val)
824{
825 lock_sock(sk);
826 sk->sk_mark = val;
827 release_sock(sk);
828}
829EXPORT_SYMBOL(sock_set_mark);
830
831/*
832 * This is meant for all protocols to use and covers goings on
833 * at the socket level. Everything here is generic.
834 */
835
836int sock_setsockopt(struct socket *sock, int level, int optname,
837 sockptr_t optval, unsigned int optlen)
838{
839 struct sock_txtime sk_txtime;
840 struct sock *sk = sock->sk;
841 int val;
842 int valbool;
843 struct linger ling;
844 int ret = 0;
845
846 /*
847 * Options without arguments
848 */
849
850 if (optname == SO_BINDTODEVICE)
851 return sock_setbindtodevice(sk, optval, optlen);
852
853 if (optlen < sizeof(int))
854 return -EINVAL;
855
856 if (copy_from_sockptr(&val, optval, sizeof(val)))
857 return -EFAULT;
858
859 valbool = val ? 1 : 0;
860
861 lock_sock(sk);
862
863 switch (optname) {
864 case SO_DEBUG:
865 if (val && !capable(CAP_NET_ADMIN))
866 ret = -EACCES;
867 else
868 sock_valbool_flag(sk, SOCK_DBG, valbool);
869 break;
870 case SO_REUSEADDR:
871 sk->sk_reuse = (valbool ? SK_CAN_REUSE : SK_NO_REUSE);
872 break;
873 case SO_REUSEPORT:
874 sk->sk_reuseport = valbool;
875 break;
876 case SO_TYPE:
877 case SO_PROTOCOL:
878 case SO_DOMAIN:
879 case SO_ERROR:
880 ret = -ENOPROTOOPT;
881 break;
882 case SO_DONTROUTE:
883 sock_valbool_flag(sk, SOCK_LOCALROUTE, valbool);
884 sk_dst_reset(sk);
885 break;
886 case SO_BROADCAST:
887 sock_valbool_flag(sk, SOCK_BROADCAST, valbool);
888 break;
889 case SO_SNDBUF:
890 /* Don't error on this BSD doesn't and if you think
891 * about it this is right. Otherwise apps have to
892 * play 'guess the biggest size' games. RCVBUF/SNDBUF
893 * are treated in BSD as hints
894 */
895 val = min_t(u32, val, sysctl_wmem_max);
896set_sndbuf:
897 /* Ensure val * 2 fits into an int, to prevent max_t()
898 * from treating it as a negative value.
899 */
900 val = min_t(int, val, INT_MAX / 2);
901 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
902 WRITE_ONCE(sk->sk_sndbuf,
903 max_t(int, val * 2, SOCK_MIN_SNDBUF));
904 /* Wake up sending tasks if we upped the value. */
905 sk->sk_write_space(sk);
906 break;
907
908 case SO_SNDBUFFORCE:
909 if (!capable(CAP_NET_ADMIN)) {
910 ret = -EPERM;
911 break;
912 }
913
914 /* No negative values (to prevent underflow, as val will be
915 * multiplied by 2).
916 */
917 if (val < 0)
918 val = 0;
919 goto set_sndbuf;
920
921 case SO_RCVBUF:
922 /* Don't error on this BSD doesn't and if you think
923 * about it this is right. Otherwise apps have to
924 * play 'guess the biggest size' games. RCVBUF/SNDBUF
925 * are treated in BSD as hints
926 */
927 __sock_set_rcvbuf(sk, min_t(u32, val, sysctl_rmem_max));
928 break;
929
930 case SO_RCVBUFFORCE:
931 if (!capable(CAP_NET_ADMIN)) {
932 ret = -EPERM;
933 break;
934 }
935
936 /* No negative values (to prevent underflow, as val will be
937 * multiplied by 2).
938 */
939 __sock_set_rcvbuf(sk, max(val, 0));
940 break;
941
942 case SO_KEEPALIVE:
943 if (sk->sk_prot->keepalive)
944 sk->sk_prot->keepalive(sk, valbool);
945 sock_valbool_flag(sk, SOCK_KEEPOPEN, valbool);
946 break;
947
948 case SO_OOBINLINE:
949 sock_valbool_flag(sk, SOCK_URGINLINE, valbool);
950 break;
951
952 case SO_NO_CHECK:
953 sk->sk_no_check_tx = valbool;
954 break;
955
956 case SO_PRIORITY:
957 if ((val >= 0 && val <= 6) ||
958 ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
959 sk->sk_priority = val;
960 else
961 ret = -EPERM;
962 break;
963
964 case SO_LINGER:
965 if (optlen < sizeof(ling)) {
966 ret = -EINVAL; /* 1003.1g */
967 break;
968 }
969 if (copy_from_sockptr(&ling, optval, sizeof(ling))) {
970 ret = -EFAULT;
971 break;
972 }
973 if (!ling.l_onoff)
974 sock_reset_flag(sk, SOCK_LINGER);
975 else {
976#if (BITS_PER_LONG == 32)
977 if ((unsigned int)ling.l_linger >= MAX_SCHEDULE_TIMEOUT/HZ)
978 sk->sk_lingertime = MAX_SCHEDULE_TIMEOUT;
979 else
980#endif
981 sk->sk_lingertime = (unsigned int)ling.l_linger * HZ;
982 sock_set_flag(sk, SOCK_LINGER);
983 }
984 break;
985
986 case SO_BSDCOMPAT:
987 sock_warn_obsolete_bsdism("setsockopt");
988 break;
989
990 case SO_PASSCRED:
991 if (valbool)
992 set_bit(SOCK_PASSCRED, &sock->flags);
993 else
994 clear_bit(SOCK_PASSCRED, &sock->flags);
995 break;
996
997 case SO_TIMESTAMP_OLD:
998 __sock_set_timestamps(sk, valbool, false, false);
999 break;
1000 case SO_TIMESTAMP_NEW:
1001 __sock_set_timestamps(sk, valbool, true, false);
1002 break;
1003 case SO_TIMESTAMPNS_OLD:
1004 __sock_set_timestamps(sk, valbool, false, true);
1005 break;
1006 case SO_TIMESTAMPNS_NEW:
1007 __sock_set_timestamps(sk, valbool, true, true);
1008 break;
1009 case SO_TIMESTAMPING_NEW:
1010 sock_set_flag(sk, SOCK_TSTAMP_NEW);
1011 fallthrough;
1012 case SO_TIMESTAMPING_OLD:
1013 if (val & ~SOF_TIMESTAMPING_MASK) {
1014 ret = -EINVAL;
1015 break;
1016 }
1017
1018 if (val & SOF_TIMESTAMPING_OPT_ID &&
1019 !(sk->sk_tsflags & SOF_TIMESTAMPING_OPT_ID)) {
1020 if (sk->sk_protocol == IPPROTO_TCP &&
1021 sk->sk_type == SOCK_STREAM) {
1022 if ((1 << sk->sk_state) &
1023 (TCPF_CLOSE | TCPF_LISTEN)) {
1024 ret = -EINVAL;
1025 break;
1026 }
1027 sk->sk_tskey = tcp_sk(sk)->snd_una;
1028 } else {
1029 sk->sk_tskey = 0;
1030 }
1031 }
1032
1033 if (val & SOF_TIMESTAMPING_OPT_STATS &&
1034 !(val & SOF_TIMESTAMPING_OPT_TSONLY)) {
1035 ret = -EINVAL;
1036 break;
1037 }
1038
1039 sk->sk_tsflags = val;
1040 if (val & SOF_TIMESTAMPING_RX_SOFTWARE)
1041 sock_enable_timestamp(sk,
1042 SOCK_TIMESTAMPING_RX_SOFTWARE);
1043 else {
1044 if (optname == SO_TIMESTAMPING_NEW)
1045 sock_reset_flag(sk, SOCK_TSTAMP_NEW);
1046
1047 sock_disable_timestamp(sk,
1048 (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE));
1049 }
1050 break;
1051
1052 case SO_RCVLOWAT:
1053 if (val < 0)
1054 val = INT_MAX;
1055 if (sock->ops->set_rcvlowat)
1056 ret = sock->ops->set_rcvlowat(sk, val);
1057 else
1058 WRITE_ONCE(sk->sk_rcvlowat, val ? : 1);
1059 break;
1060
1061 case SO_RCVTIMEO_OLD:
1062 case SO_RCVTIMEO_NEW:
1063 ret = sock_set_timeout(&sk->sk_rcvtimeo, optval,
1064 optlen, optname == SO_RCVTIMEO_OLD);
1065 break;
1066
1067 case SO_SNDTIMEO_OLD:
1068 case SO_SNDTIMEO_NEW:
1069 ret = sock_set_timeout(&sk->sk_sndtimeo, optval,
1070 optlen, optname == SO_SNDTIMEO_OLD);
1071 break;
1072
1073 case SO_ATTACH_FILTER: {
1074 struct sock_fprog fprog;
1075
1076 ret = copy_bpf_fprog_from_user(&fprog, optval, optlen);
1077 if (!ret)
1078 ret = sk_attach_filter(&fprog, sk);
1079 break;
1080 }
1081 case SO_ATTACH_BPF:
1082 ret = -EINVAL;
1083 if (optlen == sizeof(u32)) {
1084 u32 ufd;
1085
1086 ret = -EFAULT;
1087 if (copy_from_sockptr(&ufd, optval, sizeof(ufd)))
1088 break;
1089
1090 ret = sk_attach_bpf(ufd, sk);
1091 }
1092 break;
1093
1094 case SO_ATTACH_REUSEPORT_CBPF: {
1095 struct sock_fprog fprog;
1096
1097 ret = copy_bpf_fprog_from_user(&fprog, optval, optlen);
1098 if (!ret)
1099 ret = sk_reuseport_attach_filter(&fprog, sk);
1100 break;
1101 }
1102 case SO_ATTACH_REUSEPORT_EBPF:
1103 ret = -EINVAL;
1104 if (optlen == sizeof(u32)) {
1105 u32 ufd;
1106
1107 ret = -EFAULT;
1108 if (copy_from_sockptr(&ufd, optval, sizeof(ufd)))
1109 break;
1110
1111 ret = sk_reuseport_attach_bpf(ufd, sk);
1112 }
1113 break;
1114
1115 case SO_DETACH_REUSEPORT_BPF:
1116 ret = reuseport_detach_prog(sk);
1117 break;
1118
1119 case SO_DETACH_FILTER:
1120 ret = sk_detach_filter(sk);
1121 break;
1122
1123 case SO_LOCK_FILTER:
1124 if (sock_flag(sk, SOCK_FILTER_LOCKED) && !valbool)
1125 ret = -EPERM;
1126 else
1127 sock_valbool_flag(sk, SOCK_FILTER_LOCKED, valbool);
1128 break;
1129
1130 case SO_PASSSEC:
1131 if (valbool)
1132 set_bit(SOCK_PASSSEC, &sock->flags);
1133 else
1134 clear_bit(SOCK_PASSSEC, &sock->flags);
1135 break;
1136 case SO_MARK:
1137 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) {
1138 ret = -EPERM;
1139 } else if (val != sk->sk_mark) {
1140 sk->sk_mark = val;
1141 sk_dst_reset(sk);
1142 }
1143 break;
1144
1145 case SO_RXQ_OVFL:
1146 sock_valbool_flag(sk, SOCK_RXQ_OVFL, valbool);
1147 break;
1148
1149 case SO_WIFI_STATUS:
1150 sock_valbool_flag(sk, SOCK_WIFI_STATUS, valbool);
1151 break;
1152
1153 case SO_PEEK_OFF:
1154 if (sock->ops->set_peek_off)
1155 ret = sock->ops->set_peek_off(sk, val);
1156 else
1157 ret = -EOPNOTSUPP;
1158 break;
1159
1160 case SO_NOFCS:
1161 sock_valbool_flag(sk, SOCK_NOFCS, valbool);
1162 break;
1163
1164 case SO_SELECT_ERR_QUEUE:
1165 sock_valbool_flag(sk, SOCK_SELECT_ERR_QUEUE, valbool);
1166 break;
1167
1168#ifdef CONFIG_NET_RX_BUSY_POLL
1169 case SO_BUSY_POLL:
1170 /* allow unprivileged users to decrease the value */
1171 if ((val > sk->sk_ll_usec) && !capable(CAP_NET_ADMIN))
1172 ret = -EPERM;
1173 else {
1174 if (val < 0)
1175 ret = -EINVAL;
1176 else
1177 sk->sk_ll_usec = val;
1178 }
1179 break;
1180#endif
1181
1182 case SO_MAX_PACING_RATE:
1183 {
1184 unsigned long ulval = (val == ~0U) ? ~0UL : val;
1185
1186 if (sizeof(ulval) != sizeof(val) &&
1187 optlen >= sizeof(ulval) &&
1188 copy_from_sockptr(&ulval, optval, sizeof(ulval))) {
1189 ret = -EFAULT;
1190 break;
1191 }
1192 if (ulval != ~0UL)
1193 cmpxchg(&sk->sk_pacing_status,
1194 SK_PACING_NONE,
1195 SK_PACING_NEEDED);
1196 sk->sk_max_pacing_rate = ulval;
1197 sk->sk_pacing_rate = min(sk->sk_pacing_rate, ulval);
1198 break;
1199 }
1200 case SO_INCOMING_CPU:
1201 WRITE_ONCE(sk->sk_incoming_cpu, val);
1202 break;
1203
1204 case SO_CNX_ADVICE:
1205 if (val == 1)
1206 dst_negative_advice(sk);
1207 break;
1208
1209 case SO_ZEROCOPY:
1210 if (sk->sk_family == PF_INET || sk->sk_family == PF_INET6) {
1211 if (!((sk->sk_type == SOCK_STREAM &&
1212 sk->sk_protocol == IPPROTO_TCP) ||
1213 (sk->sk_type == SOCK_DGRAM &&
1214 sk->sk_protocol == IPPROTO_UDP)))
1215 ret = -ENOTSUPP;
1216 } else if (sk->sk_family != PF_RDS) {
1217 ret = -ENOTSUPP;
1218 }
1219 if (!ret) {
1220 if (val < 0 || val > 1)
1221 ret = -EINVAL;
1222 else
1223 sock_valbool_flag(sk, SOCK_ZEROCOPY, valbool);
1224 }
1225 break;
1226
1227 case SO_TXTIME:
1228 if (optlen != sizeof(struct sock_txtime)) {
1229 ret = -EINVAL;
1230 break;
1231 } else if (copy_from_sockptr(&sk_txtime, optval,
1232 sizeof(struct sock_txtime))) {
1233 ret = -EFAULT;
1234 break;
1235 } else if (sk_txtime.flags & ~SOF_TXTIME_FLAGS_MASK) {
1236 ret = -EINVAL;
1237 break;
1238 }
1239 /* CLOCK_MONOTONIC is only used by sch_fq, and this packet
1240 * scheduler has enough safe guards.
1241 */
1242 if (sk_txtime.clockid != CLOCK_MONOTONIC &&
1243 !ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) {
1244 ret = -EPERM;
1245 break;
1246 }
1247 sock_valbool_flag(sk, SOCK_TXTIME, true);
1248 sk->sk_clockid = sk_txtime.clockid;
1249 sk->sk_txtime_deadline_mode =
1250 !!(sk_txtime.flags & SOF_TXTIME_DEADLINE_MODE);
1251 sk->sk_txtime_report_errors =
1252 !!(sk_txtime.flags & SOF_TXTIME_REPORT_ERRORS);
1253 break;
1254
1255 case SO_BINDTOIFINDEX:
1256 ret = sock_bindtoindex_locked(sk, val);
1257 break;
1258
1259 default:
1260 ret = -ENOPROTOOPT;
1261 break;
1262 }
1263 release_sock(sk);
1264 return ret;
1265}
1266EXPORT_SYMBOL(sock_setsockopt);
1267
1268
1269static void cred_to_ucred(struct pid *pid, const struct cred *cred,
1270 struct ucred *ucred)
1271{
1272 ucred->pid = pid_vnr(pid);
1273 ucred->uid = ucred->gid = -1;
1274 if (cred) {
1275 struct user_namespace *current_ns = current_user_ns();
1276
1277 ucred->uid = from_kuid_munged(current_ns, cred->euid);
1278 ucred->gid = from_kgid_munged(current_ns, cred->egid);
1279 }
1280}
1281
1282static int groups_to_user(gid_t __user *dst, const struct group_info *src)
1283{
1284 struct user_namespace *user_ns = current_user_ns();
1285 int i;
1286
1287 for (i = 0; i < src->ngroups; i++)
1288 if (put_user(from_kgid_munged(user_ns, src->gid[i]), dst + i))
1289 return -EFAULT;
1290
1291 return 0;
1292}
1293
1294int sock_getsockopt(struct socket *sock, int level, int optname,
1295 char __user *optval, int __user *optlen)
1296{
1297 struct sock *sk = sock->sk;
1298
1299 union {
1300 int val;
1301 u64 val64;
1302 unsigned long ulval;
1303 struct linger ling;
1304 struct old_timeval32 tm32;
1305 struct __kernel_old_timeval tm;
1306 struct __kernel_sock_timeval stm;
1307 struct sock_txtime txtime;
1308 } v;
1309
1310 int lv = sizeof(int);
1311 int len;
1312
1313 if (get_user(len, optlen))
1314 return -EFAULT;
1315 if (len < 0)
1316 return -EINVAL;
1317
1318 memset(&v, 0, sizeof(v));
1319
1320 switch (optname) {
1321 case SO_DEBUG:
1322 v.val = sock_flag(sk, SOCK_DBG);
1323 break;
1324
1325 case SO_DONTROUTE:
1326 v.val = sock_flag(sk, SOCK_LOCALROUTE);
1327 break;
1328
1329 case SO_BROADCAST:
1330 v.val = sock_flag(sk, SOCK_BROADCAST);
1331 break;
1332
1333 case SO_SNDBUF:
1334 v.val = sk->sk_sndbuf;
1335 break;
1336
1337 case SO_RCVBUF:
1338 v.val = sk->sk_rcvbuf;
1339 break;
1340
1341 case SO_REUSEADDR:
1342 v.val = sk->sk_reuse;
1343 break;
1344
1345 case SO_REUSEPORT:
1346 v.val = sk->sk_reuseport;
1347 break;
1348
1349 case SO_KEEPALIVE:
1350 v.val = sock_flag(sk, SOCK_KEEPOPEN);
1351 break;
1352
1353 case SO_TYPE:
1354 v.val = sk->sk_type;
1355 break;
1356
1357 case SO_PROTOCOL:
1358 v.val = sk->sk_protocol;
1359 break;
1360
1361 case SO_DOMAIN:
1362 v.val = sk->sk_family;
1363 break;
1364
1365 case SO_ERROR:
1366 v.val = -sock_error(sk);
1367 if (v.val == 0)
1368 v.val = xchg(&sk->sk_err_soft, 0);
1369 break;
1370
1371 case SO_OOBINLINE:
1372 v.val = sock_flag(sk, SOCK_URGINLINE);
1373 break;
1374
1375 case SO_NO_CHECK:
1376 v.val = sk->sk_no_check_tx;
1377 break;
1378
1379 case SO_PRIORITY:
1380 v.val = sk->sk_priority;
1381 break;
1382
1383 case SO_LINGER:
1384 lv = sizeof(v.ling);
1385 v.ling.l_onoff = sock_flag(sk, SOCK_LINGER);
1386 v.ling.l_linger = sk->sk_lingertime / HZ;
1387 break;
1388
1389 case SO_BSDCOMPAT:
1390 sock_warn_obsolete_bsdism("getsockopt");
1391 break;
1392
1393 case SO_TIMESTAMP_OLD:
1394 v.val = sock_flag(sk, SOCK_RCVTSTAMP) &&
1395 !sock_flag(sk, SOCK_TSTAMP_NEW) &&
1396 !sock_flag(sk, SOCK_RCVTSTAMPNS);
1397 break;
1398
1399 case SO_TIMESTAMPNS_OLD:
1400 v.val = sock_flag(sk, SOCK_RCVTSTAMPNS) && !sock_flag(sk, SOCK_TSTAMP_NEW);
1401 break;
1402
1403 case SO_TIMESTAMP_NEW:
1404 v.val = sock_flag(sk, SOCK_RCVTSTAMP) && sock_flag(sk, SOCK_TSTAMP_NEW);
1405 break;
1406
1407 case SO_TIMESTAMPNS_NEW:
1408 v.val = sock_flag(sk, SOCK_RCVTSTAMPNS) && sock_flag(sk, SOCK_TSTAMP_NEW);
1409 break;
1410
1411 case SO_TIMESTAMPING_OLD:
1412 v.val = sk->sk_tsflags;
1413 break;
1414
1415 case SO_RCVTIMEO_OLD:
1416 case SO_RCVTIMEO_NEW:
1417 lv = sock_get_timeout(sk->sk_rcvtimeo, &v, SO_RCVTIMEO_OLD == optname);
1418 break;
1419
1420 case SO_SNDTIMEO_OLD:
1421 case SO_SNDTIMEO_NEW:
1422 lv = sock_get_timeout(sk->sk_sndtimeo, &v, SO_SNDTIMEO_OLD == optname);
1423 break;
1424
1425 case SO_RCVLOWAT:
1426 v.val = sk->sk_rcvlowat;
1427 break;
1428
1429 case SO_SNDLOWAT:
1430 v.val = 1;
1431 break;
1432
1433 case SO_PASSCRED:
1434 v.val = !!test_bit(SOCK_PASSCRED, &sock->flags);
1435 break;
1436
1437 case SO_PEERCRED:
1438 {
1439 struct ucred peercred;
1440 if (len > sizeof(peercred))
1441 len = sizeof(peercred);
1442 cred_to_ucred(sk->sk_peer_pid, sk->sk_peer_cred, &peercred);
1443 if (copy_to_user(optval, &peercred, len))
1444 return -EFAULT;
1445 goto lenout;
1446 }
1447
1448 case SO_PEERGROUPS:
1449 {
1450 int ret, n;
1451
1452 if (!sk->sk_peer_cred)
1453 return -ENODATA;
1454
1455 n = sk->sk_peer_cred->group_info->ngroups;
1456 if (len < n * sizeof(gid_t)) {
1457 len = n * sizeof(gid_t);
1458 return put_user(len, optlen) ? -EFAULT : -ERANGE;
1459 }
1460 len = n * sizeof(gid_t);
1461
1462 ret = groups_to_user((gid_t __user *)optval,
1463 sk->sk_peer_cred->group_info);
1464 if (ret)
1465 return ret;
1466 goto lenout;
1467 }
1468
1469 case SO_PEERNAME:
1470 {
1471 char address[128];
1472
1473 lv = sock->ops->getname(sock, (struct sockaddr *)address, 2);
1474 if (lv < 0)
1475 return -ENOTCONN;
1476 if (lv < len)
1477 return -EINVAL;
1478 if (copy_to_user(optval, address, len))
1479 return -EFAULT;
1480 goto lenout;
1481 }
1482
1483 /* Dubious BSD thing... Probably nobody even uses it, but
1484 * the UNIX standard wants it for whatever reason... -DaveM
1485 */
1486 case SO_ACCEPTCONN:
1487 v.val = sk->sk_state == TCP_LISTEN;
1488 break;
1489
1490 case SO_PASSSEC:
1491 v.val = !!test_bit(SOCK_PASSSEC, &sock->flags);
1492 break;
1493
1494 case SO_PEERSEC:
1495 return security_socket_getpeersec_stream(sock, optval, optlen, len);
1496
1497 case SO_MARK:
1498 v.val = sk->sk_mark;
1499 break;
1500
1501 case SO_RXQ_OVFL:
1502 v.val = sock_flag(sk, SOCK_RXQ_OVFL);
1503 break;
1504
1505 case SO_WIFI_STATUS:
1506 v.val = sock_flag(sk, SOCK_WIFI_STATUS);
1507 break;
1508
1509 case SO_PEEK_OFF:
1510 if (!sock->ops->set_peek_off)
1511 return -EOPNOTSUPP;
1512
1513 v.val = sk->sk_peek_off;
1514 break;
1515 case SO_NOFCS:
1516 v.val = sock_flag(sk, SOCK_NOFCS);
1517 break;
1518
1519 case SO_BINDTODEVICE:
1520 return sock_getbindtodevice(sk, optval, optlen, len);
1521
1522 case SO_GET_FILTER:
1523 len = sk_get_filter(sk, (struct sock_filter __user *)optval, len);
1524 if (len < 0)
1525 return len;
1526
1527 goto lenout;
1528
1529 case SO_LOCK_FILTER:
1530 v.val = sock_flag(sk, SOCK_FILTER_LOCKED);
1531 break;
1532
1533 case SO_BPF_EXTENSIONS:
1534 v.val = bpf_tell_extensions();
1535 break;
1536
1537 case SO_SELECT_ERR_QUEUE:
1538 v.val = sock_flag(sk, SOCK_SELECT_ERR_QUEUE);
1539 break;
1540
1541#ifdef CONFIG_NET_RX_BUSY_POLL
1542 case SO_BUSY_POLL:
1543 v.val = sk->sk_ll_usec;
1544 break;
1545#endif
1546
1547 case SO_MAX_PACING_RATE:
1548 if (sizeof(v.ulval) != sizeof(v.val) && len >= sizeof(v.ulval)) {
1549 lv = sizeof(v.ulval);
1550 v.ulval = sk->sk_max_pacing_rate;
1551 } else {
1552 /* 32bit version */
1553 v.val = min_t(unsigned long, sk->sk_max_pacing_rate, ~0U);
1554 }
1555 break;
1556
1557 case SO_INCOMING_CPU:
1558 v.val = READ_ONCE(sk->sk_incoming_cpu);
1559 break;
1560
1561 case SO_MEMINFO:
1562 {
1563 u32 meminfo[SK_MEMINFO_VARS];
1564
1565 sk_get_meminfo(sk, meminfo);
1566
1567 len = min_t(unsigned int, len, sizeof(meminfo));
1568 if (copy_to_user(optval, &meminfo, len))
1569 return -EFAULT;
1570
1571 goto lenout;
1572 }
1573
1574#ifdef CONFIG_NET_RX_BUSY_POLL
1575 case SO_INCOMING_NAPI_ID:
1576 v.val = READ_ONCE(sk->sk_napi_id);
1577
1578 /* aggregate non-NAPI IDs down to 0 */
1579 if (v.val < MIN_NAPI_ID)
1580 v.val = 0;
1581
1582 break;
1583#endif
1584
1585 case SO_COOKIE:
1586 lv = sizeof(u64);
1587 if (len < lv)
1588 return -EINVAL;
1589 v.val64 = sock_gen_cookie(sk);
1590 break;
1591
1592 case SO_ZEROCOPY:
1593 v.val = sock_flag(sk, SOCK_ZEROCOPY);
1594 break;
1595
1596 case SO_TXTIME:
1597 lv = sizeof(v.txtime);
1598 v.txtime.clockid = sk->sk_clockid;
1599 v.txtime.flags |= sk->sk_txtime_deadline_mode ?
1600 SOF_TXTIME_DEADLINE_MODE : 0;
1601 v.txtime.flags |= sk->sk_txtime_report_errors ?
1602 SOF_TXTIME_REPORT_ERRORS : 0;
1603 break;
1604
1605 case SO_BINDTOIFINDEX:
1606 v.val = sk->sk_bound_dev_if;
1607 break;
1608
1609 default:
1610 /* We implement the SO_SNDLOWAT etc to not be settable
1611 * (1003.1g 7).
1612 */
1613 return -ENOPROTOOPT;
1614 }
1615
1616 if (len > lv)
1617 len = lv;
1618 if (copy_to_user(optval, &v, len))
1619 return -EFAULT;
1620lenout:
1621 if (put_user(len, optlen))
1622 return -EFAULT;
1623 return 0;
1624}
1625
1626/*
1627 * Initialize an sk_lock.
1628 *
1629 * (We also register the sk_lock with the lock validator.)
1630 */
1631static inline void sock_lock_init(struct sock *sk)
1632{
1633 if (sk->sk_kern_sock)
1634 sock_lock_init_class_and_name(
1635 sk,
1636 af_family_kern_slock_key_strings[sk->sk_family],
1637 af_family_kern_slock_keys + sk->sk_family,
1638 af_family_kern_key_strings[sk->sk_family],
1639 af_family_kern_keys + sk->sk_family);
1640 else
1641 sock_lock_init_class_and_name(
1642 sk,
1643 af_family_slock_key_strings[sk->sk_family],
1644 af_family_slock_keys + sk->sk_family,
1645 af_family_key_strings[sk->sk_family],
1646 af_family_keys + sk->sk_family);
1647}
1648
1649/*
1650 * Copy all fields from osk to nsk but nsk->sk_refcnt must not change yet,
1651 * even temporarly, because of RCU lookups. sk_node should also be left as is.
1652 * We must not copy fields between sk_dontcopy_begin and sk_dontcopy_end
1653 */
1654static void sock_copy(struct sock *nsk, const struct sock *osk)
1655{
1656 const struct proto *prot = READ_ONCE(osk->sk_prot);
1657#ifdef CONFIG_SECURITY_NETWORK
1658 void *sptr = nsk->sk_security;
1659#endif
1660 memcpy(nsk, osk, offsetof(struct sock, sk_dontcopy_begin));
1661
1662 memcpy(&nsk->sk_dontcopy_end, &osk->sk_dontcopy_end,
1663 prot->obj_size - offsetof(struct sock, sk_dontcopy_end));
1664
1665#ifdef CONFIG_SECURITY_NETWORK
1666 nsk->sk_security = sptr;
1667 security_sk_clone(osk, nsk);
1668#endif
1669}
1670
1671static struct sock *sk_prot_alloc(struct proto *prot, gfp_t priority,
1672 int family)
1673{
1674 struct sock *sk;
1675 struct kmem_cache *slab;
1676
1677 slab = prot->slab;
1678 if (slab != NULL) {
1679 sk = kmem_cache_alloc(slab, priority & ~__GFP_ZERO);
1680 if (!sk)
1681 return sk;
1682 if (want_init_on_alloc(priority))
1683 sk_prot_clear_nulls(sk, prot->obj_size);
1684 } else
1685 sk = kmalloc(prot->obj_size, priority);
1686
1687 if (sk != NULL) {
1688 if (security_sk_alloc(sk, family, priority))
1689 goto out_free;
1690
1691 if (!try_module_get(prot->owner))
1692 goto out_free_sec;
1693 sk_tx_queue_clear(sk);
1694 }
1695
1696 return sk;
1697
1698out_free_sec:
1699 security_sk_free(sk);
1700out_free:
1701 if (slab != NULL)
1702 kmem_cache_free(slab, sk);
1703 else
1704 kfree(sk);
1705 return NULL;
1706}
1707
1708static void sk_prot_free(struct proto *prot, struct sock *sk)
1709{
1710 struct kmem_cache *slab;
1711 struct module *owner;
1712
1713 owner = prot->owner;
1714 slab = prot->slab;
1715
1716 cgroup_sk_free(&sk->sk_cgrp_data);
1717 mem_cgroup_sk_free(sk);
1718 security_sk_free(sk);
1719 if (slab != NULL)
1720 kmem_cache_free(slab, sk);
1721 else
1722 kfree(sk);
1723 module_put(owner);
1724}
1725
1726/**
1727 * sk_alloc - All socket objects are allocated here
1728 * @net: the applicable net namespace
1729 * @family: protocol family
1730 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
1731 * @prot: struct proto associated with this new sock instance
1732 * @kern: is this to be a kernel socket?
1733 */
1734struct sock *sk_alloc(struct net *net, int family, gfp_t priority,
1735 struct proto *prot, int kern)
1736{
1737 struct sock *sk;
1738
1739 sk = sk_prot_alloc(prot, priority | __GFP_ZERO, family);
1740 if (sk) {
1741 sk->sk_family = family;
1742 /*
1743 * See comment in struct sock definition to understand
1744 * why we need sk_prot_creator -acme
1745 */
1746 sk->sk_prot = sk->sk_prot_creator = prot;
1747 sk->sk_kern_sock = kern;
1748 sock_lock_init(sk);
1749 sk->sk_net_refcnt = kern ? 0 : 1;
1750 if (likely(sk->sk_net_refcnt)) {
1751 get_net(net);
1752 sock_inuse_add(net, 1);
1753 }
1754
1755 sock_net_set(sk, net);
1756 refcount_set(&sk->sk_wmem_alloc, 1);
1757
1758 mem_cgroup_sk_alloc(sk);
1759 cgroup_sk_alloc(&sk->sk_cgrp_data);
1760 sock_update_classid(&sk->sk_cgrp_data);
1761 sock_update_netprioidx(&sk->sk_cgrp_data);
1762 sk_tx_queue_clear(sk);
1763 }
1764
1765 return sk;
1766}
1767EXPORT_SYMBOL(sk_alloc);
1768
1769/* Sockets having SOCK_RCU_FREE will call this function after one RCU
1770 * grace period. This is the case for UDP sockets and TCP listeners.
1771 */
1772static void __sk_destruct(struct rcu_head *head)
1773{
1774 struct sock *sk = container_of(head, struct sock, sk_rcu);
1775 struct sk_filter *filter;
1776
1777 if (sk->sk_destruct)
1778 sk->sk_destruct(sk);
1779
1780 filter = rcu_dereference_check(sk->sk_filter,
1781 refcount_read(&sk->sk_wmem_alloc) == 0);
1782 if (filter) {
1783 sk_filter_uncharge(sk, filter);
1784 RCU_INIT_POINTER(sk->sk_filter, NULL);
1785 }
1786
1787 sock_disable_timestamp(sk, SK_FLAGS_TIMESTAMP);
1788
1789#ifdef CONFIG_BPF_SYSCALL
1790 bpf_sk_storage_free(sk);
1791#endif
1792
1793 if (atomic_read(&sk->sk_omem_alloc))
1794 pr_debug("%s: optmem leakage (%d bytes) detected\n",
1795 __func__, atomic_read(&sk->sk_omem_alloc));
1796
1797 if (sk->sk_frag.page) {
1798 put_page(sk->sk_frag.page);
1799 sk->sk_frag.page = NULL;
1800 }
1801
1802 if (sk->sk_peer_cred)
1803 put_cred(sk->sk_peer_cred);
1804 put_pid(sk->sk_peer_pid);
1805 if (likely(sk->sk_net_refcnt))
1806 put_net(sock_net(sk));
1807 sk_prot_free(sk->sk_prot_creator, sk);
1808}
1809
1810void sk_destruct(struct sock *sk)
1811{
1812 bool use_call_rcu = sock_flag(sk, SOCK_RCU_FREE);
1813
1814 if (rcu_access_pointer(sk->sk_reuseport_cb)) {
1815 reuseport_detach_sock(sk);
1816 use_call_rcu = true;
1817 }
1818
1819 if (use_call_rcu)
1820 call_rcu(&sk->sk_rcu, __sk_destruct);
1821 else
1822 __sk_destruct(&sk->sk_rcu);
1823}
1824
1825static void __sk_free(struct sock *sk)
1826{
1827 if (likely(sk->sk_net_refcnt))
1828 sock_inuse_add(sock_net(sk), -1);
1829
1830 if (unlikely(sk->sk_net_refcnt && sock_diag_has_destroy_listeners(sk)))
1831 sock_diag_broadcast_destroy(sk);
1832 else
1833 sk_destruct(sk);
1834}
1835
1836void sk_free(struct sock *sk)
1837{
1838 /*
1839 * We subtract one from sk_wmem_alloc and can know if
1840 * some packets are still in some tx queue.
1841 * If not null, sock_wfree() will call __sk_free(sk) later
1842 */
1843 if (refcount_dec_and_test(&sk->sk_wmem_alloc))
1844 __sk_free(sk);
1845}
1846EXPORT_SYMBOL(sk_free);
1847
1848static void sk_init_common(struct sock *sk)
1849{
1850 skb_queue_head_init(&sk->sk_receive_queue);
1851 skb_queue_head_init(&sk->sk_write_queue);
1852 skb_queue_head_init(&sk->sk_error_queue);
1853
1854 rwlock_init(&sk->sk_callback_lock);
1855 lockdep_set_class_and_name(&sk->sk_receive_queue.lock,
1856 af_rlock_keys + sk->sk_family,
1857 af_family_rlock_key_strings[sk->sk_family]);
1858 lockdep_set_class_and_name(&sk->sk_write_queue.lock,
1859 af_wlock_keys + sk->sk_family,
1860 af_family_wlock_key_strings[sk->sk_family]);
1861 lockdep_set_class_and_name(&sk->sk_error_queue.lock,
1862 af_elock_keys + sk->sk_family,
1863 af_family_elock_key_strings[sk->sk_family]);
1864 lockdep_set_class_and_name(&sk->sk_callback_lock,
1865 af_callback_keys + sk->sk_family,
1866 af_family_clock_key_strings[sk->sk_family]);
1867}
1868
1869/**
1870 * sk_clone_lock - clone a socket, and lock its clone
1871 * @sk: the socket to clone
1872 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
1873 *
1874 * Caller must unlock socket even in error path (bh_unlock_sock(newsk))
1875 */
1876struct sock *sk_clone_lock(const struct sock *sk, const gfp_t priority)
1877{
1878 struct proto *prot = READ_ONCE(sk->sk_prot);
1879 struct sock *newsk;
1880 bool is_charged = true;
1881
1882 newsk = sk_prot_alloc(prot, priority, sk->sk_family);
1883 if (newsk != NULL) {
1884 struct sk_filter *filter;
1885
1886 sock_copy(newsk, sk);
1887
1888 newsk->sk_prot_creator = prot;
1889
1890 /* SANITY */
1891 if (likely(newsk->sk_net_refcnt))
1892 get_net(sock_net(newsk));
1893 sk_node_init(&newsk->sk_node);
1894 sock_lock_init(newsk);
1895 bh_lock_sock(newsk);
1896 newsk->sk_backlog.head = newsk->sk_backlog.tail = NULL;
1897 newsk->sk_backlog.len = 0;
1898
1899 atomic_set(&newsk->sk_rmem_alloc, 0);
1900 /*
1901 * sk_wmem_alloc set to one (see sk_free() and sock_wfree())
1902 */
1903 refcount_set(&newsk->sk_wmem_alloc, 1);
1904 atomic_set(&newsk->sk_omem_alloc, 0);
1905 sk_init_common(newsk);
1906
1907 newsk->sk_dst_cache = NULL;
1908 newsk->sk_dst_pending_confirm = 0;
1909 newsk->sk_wmem_queued = 0;
1910 newsk->sk_forward_alloc = 0;
1911 atomic_set(&newsk->sk_drops, 0);
1912 newsk->sk_send_head = NULL;
1913 newsk->sk_userlocks = sk->sk_userlocks & ~SOCK_BINDPORT_LOCK;
1914 atomic_set(&newsk->sk_zckey, 0);
1915
1916 sock_reset_flag(newsk, SOCK_DONE);
1917
1918 /* sk->sk_memcg will be populated at accept() time */
1919 newsk->sk_memcg = NULL;
1920
1921 cgroup_sk_clone(&newsk->sk_cgrp_data);
1922
1923 rcu_read_lock();
1924 filter = rcu_dereference(sk->sk_filter);
1925 if (filter != NULL)
1926 /* though it's an empty new sock, the charging may fail
1927 * if sysctl_optmem_max was changed between creation of
1928 * original socket and cloning
1929 */
1930 is_charged = sk_filter_charge(newsk, filter);
1931 RCU_INIT_POINTER(newsk->sk_filter, filter);
1932 rcu_read_unlock();
1933
1934 if (unlikely(!is_charged || xfrm_sk_clone_policy(newsk, sk))) {
1935 /* We need to make sure that we don't uncharge the new
1936 * socket if we couldn't charge it in the first place
1937 * as otherwise we uncharge the parent's filter.
1938 */
1939 if (!is_charged)
1940 RCU_INIT_POINTER(newsk->sk_filter, NULL);
1941 sk_free_unlock_clone(newsk);
1942 newsk = NULL;
1943 goto out;
1944 }
1945 RCU_INIT_POINTER(newsk->sk_reuseport_cb, NULL);
1946
1947 if (bpf_sk_storage_clone(sk, newsk)) {
1948 sk_free_unlock_clone(newsk);
1949 newsk = NULL;
1950 goto out;
1951 }
1952
1953 /* Clear sk_user_data if parent had the pointer tagged
1954 * as not suitable for copying when cloning.
1955 */
1956 if (sk_user_data_is_nocopy(newsk))
1957 newsk->sk_user_data = NULL;
1958
1959 newsk->sk_err = 0;
1960 newsk->sk_err_soft = 0;
1961 newsk->sk_priority = 0;
1962 newsk->sk_incoming_cpu = raw_smp_processor_id();
1963 if (likely(newsk->sk_net_refcnt))
1964 sock_inuse_add(sock_net(newsk), 1);
1965
1966 /*
1967 * Before updating sk_refcnt, we must commit prior changes to memory
1968 * (Documentation/RCU/rculist_nulls.rst for details)
1969 */
1970 smp_wmb();
1971 refcount_set(&newsk->sk_refcnt, 2);
1972
1973 /*
1974 * Increment the counter in the same struct proto as the master
1975 * sock (sk_refcnt_debug_inc uses newsk->sk_prot->socks, that
1976 * is the same as sk->sk_prot->socks, as this field was copied
1977 * with memcpy).
1978 *
1979 * This _changes_ the previous behaviour, where
1980 * tcp_create_openreq_child always was incrementing the
1981 * equivalent to tcp_prot->socks (inet_sock_nr), so this have
1982 * to be taken into account in all callers. -acme
1983 */
1984 sk_refcnt_debug_inc(newsk);
1985 sk_set_socket(newsk, NULL);
1986 sk_tx_queue_clear(newsk);
1987 RCU_INIT_POINTER(newsk->sk_wq, NULL);
1988
1989 if (newsk->sk_prot->sockets_allocated)
1990 sk_sockets_allocated_inc(newsk);
1991
1992 if (sock_needs_netstamp(sk) &&
1993 newsk->sk_flags & SK_FLAGS_TIMESTAMP)
1994 net_enable_timestamp();
1995 }
1996out:
1997 return newsk;
1998}
1999EXPORT_SYMBOL_GPL(sk_clone_lock);
2000
2001void sk_free_unlock_clone(struct sock *sk)
2002{
2003 /* It is still raw copy of parent, so invalidate
2004 * destructor and make plain sk_free() */
2005 sk->sk_destruct = NULL;
2006 bh_unlock_sock(sk);
2007 sk_free(sk);
2008}
2009EXPORT_SYMBOL_GPL(sk_free_unlock_clone);
2010
2011void sk_setup_caps(struct sock *sk, struct dst_entry *dst)
2012{
2013 u32 max_segs = 1;
2014
2015 sk_dst_set(sk, dst);
2016 sk->sk_route_caps = dst->dev->features | sk->sk_route_forced_caps;
2017 if (sk->sk_route_caps & NETIF_F_GSO)
2018 sk->sk_route_caps |= NETIF_F_GSO_SOFTWARE;
2019 sk->sk_route_caps &= ~sk->sk_route_nocaps;
2020 if (sk_can_gso(sk)) {
2021 if (dst->header_len && !xfrm_dst_offload_ok(dst)) {
2022 sk->sk_route_caps &= ~NETIF_F_GSO_MASK;
2023 } else {
2024 sk->sk_route_caps |= NETIF_F_SG | NETIF_F_HW_CSUM;
2025 sk->sk_gso_max_size = dst->dev->gso_max_size;
2026 max_segs = max_t(u32, dst->dev->gso_max_segs, 1);
2027 }
2028 }
2029 sk->sk_gso_max_segs = max_segs;
2030}
2031EXPORT_SYMBOL_GPL(sk_setup_caps);
2032
2033/*
2034 * Simple resource managers for sockets.
2035 */
2036
2037
2038/*
2039 * Write buffer destructor automatically called from kfree_skb.
2040 */
2041void sock_wfree(struct sk_buff *skb)
2042{
2043 struct sock *sk = skb->sk;
2044 unsigned int len = skb->truesize;
2045
2046 if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE)) {
2047 /*
2048 * Keep a reference on sk_wmem_alloc, this will be released
2049 * after sk_write_space() call
2050 */
2051 WARN_ON(refcount_sub_and_test(len - 1, &sk->sk_wmem_alloc));
2052 sk->sk_write_space(sk);
2053 len = 1;
2054 }
2055 /*
2056 * if sk_wmem_alloc reaches 0, we must finish what sk_free()
2057 * could not do because of in-flight packets
2058 */
2059 if (refcount_sub_and_test(len, &sk->sk_wmem_alloc))
2060 __sk_free(sk);
2061}
2062EXPORT_SYMBOL(sock_wfree);
2063
2064/* This variant of sock_wfree() is used by TCP,
2065 * since it sets SOCK_USE_WRITE_QUEUE.
2066 */
2067void __sock_wfree(struct sk_buff *skb)
2068{
2069 struct sock *sk = skb->sk;
2070
2071 if (refcount_sub_and_test(skb->truesize, &sk->sk_wmem_alloc))
2072 __sk_free(sk);
2073}
2074
2075void skb_set_owner_w(struct sk_buff *skb, struct sock *sk)
2076{
2077 skb_orphan(skb);
2078 skb->sk = sk;
2079#ifdef CONFIG_INET
2080 if (unlikely(!sk_fullsock(sk))) {
2081 skb->destructor = sock_edemux;
2082 sock_hold(sk);
2083 return;
2084 }
2085#endif
2086 skb->destructor = sock_wfree;
2087 skb_set_hash_from_sk(skb, sk);
2088 /*
2089 * We used to take a refcount on sk, but following operation
2090 * is enough to guarantee sk_free() wont free this sock until
2091 * all in-flight packets are completed
2092 */
2093 refcount_add(skb->truesize, &sk->sk_wmem_alloc);
2094}
2095EXPORT_SYMBOL(skb_set_owner_w);
2096
2097static bool can_skb_orphan_partial(const struct sk_buff *skb)
2098{
2099#ifdef CONFIG_TLS_DEVICE
2100 /* Drivers depend on in-order delivery for crypto offload,
2101 * partial orphan breaks out-of-order-OK logic.
2102 */
2103 if (skb->decrypted)
2104 return false;
2105#endif
2106 return (skb->destructor == sock_wfree ||
2107 (IS_ENABLED(CONFIG_INET) && skb->destructor == tcp_wfree));
2108}
2109
2110/* This helper is used by netem, as it can hold packets in its
2111 * delay queue. We want to allow the owner socket to send more
2112 * packets, as if they were already TX completed by a typical driver.
2113 * But we also want to keep skb->sk set because some packet schedulers
2114 * rely on it (sch_fq for example).
2115 */
2116void skb_orphan_partial(struct sk_buff *skb)
2117{
2118 if (skb_is_tcp_pure_ack(skb))
2119 return;
2120
2121 if (can_skb_orphan_partial(skb)) {
2122 struct sock *sk = skb->sk;
2123
2124 if (refcount_inc_not_zero(&sk->sk_refcnt)) {
2125 WARN_ON(refcount_sub_and_test(skb->truesize, &sk->sk_wmem_alloc));
2126 skb->destructor = sock_efree;
2127 }
2128 } else {
2129 skb_orphan(skb);
2130 }
2131}
2132EXPORT_SYMBOL(skb_orphan_partial);
2133
2134/*
2135 * Read buffer destructor automatically called from kfree_skb.
2136 */
2137void sock_rfree(struct sk_buff *skb)
2138{
2139 struct sock *sk = skb->sk;
2140 unsigned int len = skb->truesize;
2141
2142 atomic_sub(len, &sk->sk_rmem_alloc);
2143 sk_mem_uncharge(sk, len);
2144}
2145EXPORT_SYMBOL(sock_rfree);
2146
2147/*
2148 * Buffer destructor for skbs that are not used directly in read or write
2149 * path, e.g. for error handler skbs. Automatically called from kfree_skb.
2150 */
2151void sock_efree(struct sk_buff *skb)
2152{
2153 sock_put(skb->sk);
2154}
2155EXPORT_SYMBOL(sock_efree);
2156
2157/* Buffer destructor for prefetch/receive path where reference count may
2158 * not be held, e.g. for listen sockets.
2159 */
2160#ifdef CONFIG_INET
2161void sock_pfree(struct sk_buff *skb)
2162{
2163 if (sk_is_refcounted(skb->sk))
2164 sock_gen_put(skb->sk);
2165}
2166EXPORT_SYMBOL(sock_pfree);
2167#endif /* CONFIG_INET */
2168
2169kuid_t sock_i_uid(struct sock *sk)
2170{
2171 kuid_t uid;
2172
2173 read_lock_bh(&sk->sk_callback_lock);
2174 uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : GLOBAL_ROOT_UID;
2175 read_unlock_bh(&sk->sk_callback_lock);
2176 return uid;
2177}
2178EXPORT_SYMBOL(sock_i_uid);
2179
2180unsigned long sock_i_ino(struct sock *sk)
2181{
2182 unsigned long ino;
2183
2184 read_lock_bh(&sk->sk_callback_lock);
2185 ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0;
2186 read_unlock_bh(&sk->sk_callback_lock);
2187 return ino;
2188}
2189EXPORT_SYMBOL(sock_i_ino);
2190
2191/*
2192 * Allocate a skb from the socket's send buffer.
2193 */
2194struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force,
2195 gfp_t priority)
2196{
2197 if (force ||
2198 refcount_read(&sk->sk_wmem_alloc) < READ_ONCE(sk->sk_sndbuf)) {
2199 struct sk_buff *skb = alloc_skb(size, priority);
2200
2201 if (skb) {
2202 skb_set_owner_w(skb, sk);
2203 return skb;
2204 }
2205 }
2206 return NULL;
2207}
2208EXPORT_SYMBOL(sock_wmalloc);
2209
2210static void sock_ofree(struct sk_buff *skb)
2211{
2212 struct sock *sk = skb->sk;
2213
2214 atomic_sub(skb->truesize, &sk->sk_omem_alloc);
2215}
2216
2217struct sk_buff *sock_omalloc(struct sock *sk, unsigned long size,
2218 gfp_t priority)
2219{
2220 struct sk_buff *skb;
2221
2222 /* small safe race: SKB_TRUESIZE may differ from final skb->truesize */
2223 if (atomic_read(&sk->sk_omem_alloc) + SKB_TRUESIZE(size) >
2224 sysctl_optmem_max)
2225 return NULL;
2226
2227 skb = alloc_skb(size, priority);
2228 if (!skb)
2229 return NULL;
2230
2231 atomic_add(skb->truesize, &sk->sk_omem_alloc);
2232 skb->sk = sk;
2233 skb->destructor = sock_ofree;
2234 return skb;
2235}
2236
2237/*
2238 * Allocate a memory block from the socket's option memory buffer.
2239 */
2240void *sock_kmalloc(struct sock *sk, int size, gfp_t priority)
2241{
2242 if ((unsigned int)size <= sysctl_optmem_max &&
2243 atomic_read(&sk->sk_omem_alloc) + size < sysctl_optmem_max) {
2244 void *mem;
2245 /* First do the add, to avoid the race if kmalloc
2246 * might sleep.
2247 */
2248 atomic_add(size, &sk->sk_omem_alloc);
2249 mem = kmalloc(size, priority);
2250 if (mem)
2251 return mem;
2252 atomic_sub(size, &sk->sk_omem_alloc);
2253 }
2254 return NULL;
2255}
2256EXPORT_SYMBOL(sock_kmalloc);
2257
2258/* Free an option memory block. Note, we actually want the inline
2259 * here as this allows gcc to detect the nullify and fold away the
2260 * condition entirely.
2261 */
2262static inline void __sock_kfree_s(struct sock *sk, void *mem, int size,
2263 const bool nullify)
2264{
2265 if (WARN_ON_ONCE(!mem))
2266 return;
2267 if (nullify)
2268 kfree_sensitive(mem);
2269 else
2270 kfree(mem);
2271 atomic_sub(size, &sk->sk_omem_alloc);
2272}
2273
2274void sock_kfree_s(struct sock *sk, void *mem, int size)
2275{
2276 __sock_kfree_s(sk, mem, size, false);
2277}
2278EXPORT_SYMBOL(sock_kfree_s);
2279
2280void sock_kzfree_s(struct sock *sk, void *mem, int size)
2281{
2282 __sock_kfree_s(sk, mem, size, true);
2283}
2284EXPORT_SYMBOL(sock_kzfree_s);
2285
2286/* It is almost wait_for_tcp_memory minus release_sock/lock_sock.
2287 I think, these locks should be removed for datagram sockets.
2288 */
2289static long sock_wait_for_wmem(struct sock *sk, long timeo)
2290{
2291 DEFINE_WAIT(wait);
2292
2293 sk_clear_bit(SOCKWQ_ASYNC_NOSPACE, sk);
2294 for (;;) {
2295 if (!timeo)
2296 break;
2297 if (signal_pending(current))
2298 break;
2299 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
2300 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
2301 if (refcount_read(&sk->sk_wmem_alloc) < READ_ONCE(sk->sk_sndbuf))
2302 break;
2303 if (sk->sk_shutdown & SEND_SHUTDOWN)
2304 break;
2305 if (sk->sk_err)
2306 break;
2307 timeo = schedule_timeout(timeo);
2308 }
2309 finish_wait(sk_sleep(sk), &wait);
2310 return timeo;
2311}
2312
2313
2314/*
2315 * Generic send/receive buffer handlers
2316 */
2317
2318struct sk_buff *sock_alloc_send_pskb(struct sock *sk, unsigned long header_len,
2319 unsigned long data_len, int noblock,
2320 int *errcode, int max_page_order)
2321{
2322 struct sk_buff *skb;
2323 long timeo;
2324 int err;
2325
2326 timeo = sock_sndtimeo(sk, noblock);
2327 for (;;) {
2328 err = sock_error(sk);
2329 if (err != 0)
2330 goto failure;
2331
2332 err = -EPIPE;
2333 if (sk->sk_shutdown & SEND_SHUTDOWN)
2334 goto failure;
2335
2336 if (sk_wmem_alloc_get(sk) < READ_ONCE(sk->sk_sndbuf))
2337 break;
2338
2339 sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk);
2340 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
2341 err = -EAGAIN;
2342 if (!timeo)
2343 goto failure;
2344 if (signal_pending(current))
2345 goto interrupted;
2346 timeo = sock_wait_for_wmem(sk, timeo);
2347 }
2348 skb = alloc_skb_with_frags(header_len, data_len, max_page_order,
2349 errcode, sk->sk_allocation);
2350 if (skb)
2351 skb_set_owner_w(skb, sk);
2352 return skb;
2353
2354interrupted:
2355 err = sock_intr_errno(timeo);
2356failure:
2357 *errcode = err;
2358 return NULL;
2359}
2360EXPORT_SYMBOL(sock_alloc_send_pskb);
2361
2362struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size,
2363 int noblock, int *errcode)
2364{
2365 return sock_alloc_send_pskb(sk, size, 0, noblock, errcode, 0);
2366}
2367EXPORT_SYMBOL(sock_alloc_send_skb);
2368
2369int __sock_cmsg_send(struct sock *sk, struct msghdr *msg, struct cmsghdr *cmsg,
2370 struct sockcm_cookie *sockc)
2371{
2372 u32 tsflags;
2373
2374 switch (cmsg->cmsg_type) {
2375 case SO_MARK:
2376 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
2377 return -EPERM;
2378 if (cmsg->cmsg_len != CMSG_LEN(sizeof(u32)))
2379 return -EINVAL;
2380 sockc->mark = *(u32 *)CMSG_DATA(cmsg);
2381 break;
2382 case SO_TIMESTAMPING_OLD:
2383 if (cmsg->cmsg_len != CMSG_LEN(sizeof(u32)))
2384 return -EINVAL;
2385
2386 tsflags = *(u32 *)CMSG_DATA(cmsg);
2387 if (tsflags & ~SOF_TIMESTAMPING_TX_RECORD_MASK)
2388 return -EINVAL;
2389
2390 sockc->tsflags &= ~SOF_TIMESTAMPING_TX_RECORD_MASK;
2391 sockc->tsflags |= tsflags;
2392 break;
2393 case SCM_TXTIME:
2394 if (!sock_flag(sk, SOCK_TXTIME))
2395 return -EINVAL;
2396 if (cmsg->cmsg_len != CMSG_LEN(sizeof(u64)))
2397 return -EINVAL;
2398 sockc->transmit_time = get_unaligned((u64 *)CMSG_DATA(cmsg));
2399 break;
2400 /* SCM_RIGHTS and SCM_CREDENTIALS are semantically in SOL_UNIX. */
2401 case SCM_RIGHTS:
2402 case SCM_CREDENTIALS:
2403 break;
2404 default:
2405 return -EINVAL;
2406 }
2407 return 0;
2408}
2409EXPORT_SYMBOL(__sock_cmsg_send);
2410
2411int sock_cmsg_send(struct sock *sk, struct msghdr *msg,
2412 struct sockcm_cookie *sockc)
2413{
2414 struct cmsghdr *cmsg;
2415 int ret;
2416
2417 for_each_cmsghdr(cmsg, msg) {
2418 if (!CMSG_OK(msg, cmsg))
2419 return -EINVAL;
2420 if (cmsg->cmsg_level != SOL_SOCKET)
2421 continue;
2422 ret = __sock_cmsg_send(sk, msg, cmsg, sockc);
2423 if (ret)
2424 return ret;
2425 }
2426 return 0;
2427}
2428EXPORT_SYMBOL(sock_cmsg_send);
2429
2430static void sk_enter_memory_pressure(struct sock *sk)
2431{
2432 if (!sk->sk_prot->enter_memory_pressure)
2433 return;
2434
2435 sk->sk_prot->enter_memory_pressure(sk);
2436}
2437
2438static void sk_leave_memory_pressure(struct sock *sk)
2439{
2440 if (sk->sk_prot->leave_memory_pressure) {
2441 sk->sk_prot->leave_memory_pressure(sk);
2442 } else {
2443 unsigned long *memory_pressure = sk->sk_prot->memory_pressure;
2444
2445 if (memory_pressure && READ_ONCE(*memory_pressure))
2446 WRITE_ONCE(*memory_pressure, 0);
2447 }
2448}
2449
2450#define SKB_FRAG_PAGE_ORDER get_order(32768)
2451DEFINE_STATIC_KEY_FALSE(net_high_order_alloc_disable_key);
2452
2453/**
2454 * skb_page_frag_refill - check that a page_frag contains enough room
2455 * @sz: minimum size of the fragment we want to get
2456 * @pfrag: pointer to page_frag
2457 * @gfp: priority for memory allocation
2458 *
2459 * Note: While this allocator tries to use high order pages, there is
2460 * no guarantee that allocations succeed. Therefore, @sz MUST be
2461 * less or equal than PAGE_SIZE.
2462 */
2463bool skb_page_frag_refill(unsigned int sz, struct page_frag *pfrag, gfp_t gfp)
2464{
2465 if (pfrag->page) {
2466 if (page_ref_count(pfrag->page) == 1) {
2467 pfrag->offset = 0;
2468 return true;
2469 }
2470 if (pfrag->offset + sz <= pfrag->size)
2471 return true;
2472 put_page(pfrag->page);
2473 }
2474
2475 pfrag->offset = 0;
2476 if (SKB_FRAG_PAGE_ORDER &&
2477 !static_branch_unlikely(&net_high_order_alloc_disable_key)) {
2478 /* Avoid direct reclaim but allow kswapd to wake */
2479 pfrag->page = alloc_pages((gfp & ~__GFP_DIRECT_RECLAIM) |
2480 __GFP_COMP | __GFP_NOWARN |
2481 __GFP_NORETRY,
2482 SKB_FRAG_PAGE_ORDER);
2483 if (likely(pfrag->page)) {
2484 pfrag->size = PAGE_SIZE << SKB_FRAG_PAGE_ORDER;
2485 return true;
2486 }
2487 }
2488 pfrag->page = alloc_page(gfp);
2489 if (likely(pfrag->page)) {
2490 pfrag->size = PAGE_SIZE;
2491 return true;
2492 }
2493 return false;
2494}
2495EXPORT_SYMBOL(skb_page_frag_refill);
2496
2497bool sk_page_frag_refill(struct sock *sk, struct page_frag *pfrag)
2498{
2499 if (likely(skb_page_frag_refill(32U, pfrag, sk->sk_allocation)))
2500 return true;
2501
2502 sk_enter_memory_pressure(sk);
2503 sk_stream_moderate_sndbuf(sk);
2504 return false;
2505}
2506EXPORT_SYMBOL(sk_page_frag_refill);
2507
2508static void __lock_sock(struct sock *sk)
2509 __releases(&sk->sk_lock.slock)
2510 __acquires(&sk->sk_lock.slock)
2511{
2512 DEFINE_WAIT(wait);
2513
2514 for (;;) {
2515 prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait,
2516 TASK_UNINTERRUPTIBLE);
2517 spin_unlock_bh(&sk->sk_lock.slock);
2518 schedule();
2519 spin_lock_bh(&sk->sk_lock.slock);
2520 if (!sock_owned_by_user(sk))
2521 break;
2522 }
2523 finish_wait(&sk->sk_lock.wq, &wait);
2524}
2525
2526void __release_sock(struct sock *sk)
2527 __releases(&sk->sk_lock.slock)
2528 __acquires(&sk->sk_lock.slock)
2529{
2530 struct sk_buff *skb, *next;
2531
2532 while ((skb = sk->sk_backlog.head) != NULL) {
2533 sk->sk_backlog.head = sk->sk_backlog.tail = NULL;
2534
2535 spin_unlock_bh(&sk->sk_lock.slock);
2536
2537 do {
2538 next = skb->next;
2539 prefetch(next);
2540 WARN_ON_ONCE(skb_dst_is_noref(skb));
2541 skb_mark_not_on_list(skb);
2542 sk_backlog_rcv(sk, skb);
2543
2544 cond_resched();
2545
2546 skb = next;
2547 } while (skb != NULL);
2548
2549 spin_lock_bh(&sk->sk_lock.slock);
2550 }
2551
2552 /*
2553 * Doing the zeroing here guarantee we can not loop forever
2554 * while a wild producer attempts to flood us.
2555 */
2556 sk->sk_backlog.len = 0;
2557}
2558
2559void __sk_flush_backlog(struct sock *sk)
2560{
2561 spin_lock_bh(&sk->sk_lock.slock);
2562 __release_sock(sk);
2563 spin_unlock_bh(&sk->sk_lock.slock);
2564}
2565
2566/**
2567 * sk_wait_data - wait for data to arrive at sk_receive_queue
2568 * @sk: sock to wait on
2569 * @timeo: for how long
2570 * @skb: last skb seen on sk_receive_queue
2571 *
2572 * Now socket state including sk->sk_err is changed only under lock,
2573 * hence we may omit checks after joining wait queue.
2574 * We check receive queue before schedule() only as optimization;
2575 * it is very likely that release_sock() added new data.
2576 */
2577int sk_wait_data(struct sock *sk, long *timeo, const struct sk_buff *skb)
2578{
2579 DEFINE_WAIT_FUNC(wait, woken_wake_function);
2580 int rc;
2581
2582 add_wait_queue(sk_sleep(sk), &wait);
2583 sk_set_bit(SOCKWQ_ASYNC_WAITDATA, sk);
2584 rc = sk_wait_event(sk, timeo, skb_peek_tail(&sk->sk_receive_queue) != skb, &wait);
2585 sk_clear_bit(SOCKWQ_ASYNC_WAITDATA, sk);
2586 remove_wait_queue(sk_sleep(sk), &wait);
2587 return rc;
2588}
2589EXPORT_SYMBOL(sk_wait_data);
2590
2591/**
2592 * __sk_mem_raise_allocated - increase memory_allocated
2593 * @sk: socket
2594 * @size: memory size to allocate
2595 * @amt: pages to allocate
2596 * @kind: allocation type
2597 *
2598 * Similar to __sk_mem_schedule(), but does not update sk_forward_alloc
2599 */
2600int __sk_mem_raise_allocated(struct sock *sk, int size, int amt, int kind)
2601{
2602 struct proto *prot = sk->sk_prot;
2603 long allocated = sk_memory_allocated_add(sk, amt);
2604 bool charged = true;
2605
2606 if (mem_cgroup_sockets_enabled && sk->sk_memcg &&
2607 !(charged = mem_cgroup_charge_skmem(sk->sk_memcg, amt)))
2608 goto suppress_allocation;
2609
2610 /* Under limit. */
2611 if (allocated <= sk_prot_mem_limits(sk, 0)) {
2612 sk_leave_memory_pressure(sk);
2613 return 1;
2614 }
2615
2616 /* Under pressure. */
2617 if (allocated > sk_prot_mem_limits(sk, 1))
2618 sk_enter_memory_pressure(sk);
2619
2620 /* Over hard limit. */
2621 if (allocated > sk_prot_mem_limits(sk, 2))
2622 goto suppress_allocation;
2623
2624 /* guarantee minimum buffer size under pressure */
2625 if (kind == SK_MEM_RECV) {
2626 if (atomic_read(&sk->sk_rmem_alloc) < sk_get_rmem0(sk, prot))
2627 return 1;
2628
2629 } else { /* SK_MEM_SEND */
2630 int wmem0 = sk_get_wmem0(sk, prot);
2631
2632 if (sk->sk_type == SOCK_STREAM) {
2633 if (sk->sk_wmem_queued < wmem0)
2634 return 1;
2635 } else if (refcount_read(&sk->sk_wmem_alloc) < wmem0) {
2636 return 1;
2637 }
2638 }
2639
2640 if (sk_has_memory_pressure(sk)) {
2641 u64 alloc;
2642
2643 if (!sk_under_memory_pressure(sk))
2644 return 1;
2645 alloc = sk_sockets_allocated_read_positive(sk);
2646 if (sk_prot_mem_limits(sk, 2) > alloc *
2647 sk_mem_pages(sk->sk_wmem_queued +
2648 atomic_read(&sk->sk_rmem_alloc) +
2649 sk->sk_forward_alloc))
2650 return 1;
2651 }
2652
2653suppress_allocation:
2654
2655 if (kind == SK_MEM_SEND && sk->sk_type == SOCK_STREAM) {
2656 sk_stream_moderate_sndbuf(sk);
2657
2658 /* Fail only if socket is _under_ its sndbuf.
2659 * In this case we cannot block, so that we have to fail.
2660 */
2661 if (sk->sk_wmem_queued + size >= sk->sk_sndbuf)
2662 return 1;
2663 }
2664
2665 if (kind == SK_MEM_SEND || (kind == SK_MEM_RECV && charged))
2666 trace_sock_exceed_buf_limit(sk, prot, allocated, kind);
2667
2668 sk_memory_allocated_sub(sk, amt);
2669
2670 if (mem_cgroup_sockets_enabled && sk->sk_memcg)
2671 mem_cgroup_uncharge_skmem(sk->sk_memcg, amt);
2672
2673 return 0;
2674}
2675EXPORT_SYMBOL(__sk_mem_raise_allocated);
2676
2677/**
2678 * __sk_mem_schedule - increase sk_forward_alloc and memory_allocated
2679 * @sk: socket
2680 * @size: memory size to allocate
2681 * @kind: allocation type
2682 *
2683 * If kind is SK_MEM_SEND, it means wmem allocation. Otherwise it means
2684 * rmem allocation. This function assumes that protocols which have
2685 * memory_pressure use sk_wmem_queued as write buffer accounting.
2686 */
2687int __sk_mem_schedule(struct sock *sk, int size, int kind)
2688{
2689 int ret, amt = sk_mem_pages(size);
2690
2691 sk->sk_forward_alloc += amt << SK_MEM_QUANTUM_SHIFT;
2692 ret = __sk_mem_raise_allocated(sk, size, amt, kind);
2693 if (!ret)
2694 sk->sk_forward_alloc -= amt << SK_MEM_QUANTUM_SHIFT;
2695 return ret;
2696}
2697EXPORT_SYMBOL(__sk_mem_schedule);
2698
2699/**
2700 * __sk_mem_reduce_allocated - reclaim memory_allocated
2701 * @sk: socket
2702 * @amount: number of quanta
2703 *
2704 * Similar to __sk_mem_reclaim(), but does not update sk_forward_alloc
2705 */
2706void __sk_mem_reduce_allocated(struct sock *sk, int amount)
2707{
2708 sk_memory_allocated_sub(sk, amount);
2709
2710 if (mem_cgroup_sockets_enabled && sk->sk_memcg)
2711 mem_cgroup_uncharge_skmem(sk->sk_memcg, amount);
2712
2713 if (sk_under_memory_pressure(sk) &&
2714 (sk_memory_allocated(sk) < sk_prot_mem_limits(sk, 0)))
2715 sk_leave_memory_pressure(sk);
2716}
2717EXPORT_SYMBOL(__sk_mem_reduce_allocated);
2718
2719/**
2720 * __sk_mem_reclaim - reclaim sk_forward_alloc and memory_allocated
2721 * @sk: socket
2722 * @amount: number of bytes (rounded down to a SK_MEM_QUANTUM multiple)
2723 */
2724void __sk_mem_reclaim(struct sock *sk, int amount)
2725{
2726 amount >>= SK_MEM_QUANTUM_SHIFT;
2727 sk->sk_forward_alloc -= amount << SK_MEM_QUANTUM_SHIFT;
2728 __sk_mem_reduce_allocated(sk, amount);
2729}
2730EXPORT_SYMBOL(__sk_mem_reclaim);
2731
2732int sk_set_peek_off(struct sock *sk, int val)
2733{
2734 sk->sk_peek_off = val;
2735 return 0;
2736}
2737EXPORT_SYMBOL_GPL(sk_set_peek_off);
2738
2739/*
2740 * Set of default routines for initialising struct proto_ops when
2741 * the protocol does not support a particular function. In certain
2742 * cases where it makes no sense for a protocol to have a "do nothing"
2743 * function, some default processing is provided.
2744 */
2745
2746int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len)
2747{
2748 return -EOPNOTSUPP;
2749}
2750EXPORT_SYMBOL(sock_no_bind);
2751
2752int sock_no_connect(struct socket *sock, struct sockaddr *saddr,
2753 int len, int flags)
2754{
2755 return -EOPNOTSUPP;
2756}
2757EXPORT_SYMBOL(sock_no_connect);
2758
2759int sock_no_socketpair(struct socket *sock1, struct socket *sock2)
2760{
2761 return -EOPNOTSUPP;
2762}
2763EXPORT_SYMBOL(sock_no_socketpair);
2764
2765int sock_no_accept(struct socket *sock, struct socket *newsock, int flags,
2766 bool kern)
2767{
2768 return -EOPNOTSUPP;
2769}
2770EXPORT_SYMBOL(sock_no_accept);
2771
2772int sock_no_getname(struct socket *sock, struct sockaddr *saddr,
2773 int peer)
2774{
2775 return -EOPNOTSUPP;
2776}
2777EXPORT_SYMBOL(sock_no_getname);
2778
2779int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
2780{
2781 return -EOPNOTSUPP;
2782}
2783EXPORT_SYMBOL(sock_no_ioctl);
2784
2785int sock_no_listen(struct socket *sock, int backlog)
2786{
2787 return -EOPNOTSUPP;
2788}
2789EXPORT_SYMBOL(sock_no_listen);
2790
2791int sock_no_shutdown(struct socket *sock, int how)
2792{
2793 return -EOPNOTSUPP;
2794}
2795EXPORT_SYMBOL(sock_no_shutdown);
2796
2797int sock_no_sendmsg(struct socket *sock, struct msghdr *m, size_t len)
2798{
2799 return -EOPNOTSUPP;
2800}
2801EXPORT_SYMBOL(sock_no_sendmsg);
2802
2803int sock_no_sendmsg_locked(struct sock *sk, struct msghdr *m, size_t len)
2804{
2805 return -EOPNOTSUPP;
2806}
2807EXPORT_SYMBOL(sock_no_sendmsg_locked);
2808
2809int sock_no_recvmsg(struct socket *sock, struct msghdr *m, size_t len,
2810 int flags)
2811{
2812 return -EOPNOTSUPP;
2813}
2814EXPORT_SYMBOL(sock_no_recvmsg);
2815
2816int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma)
2817{
2818 /* Mirror missing mmap method error code */
2819 return -ENODEV;
2820}
2821EXPORT_SYMBOL(sock_no_mmap);
2822
2823/*
2824 * When a file is received (via SCM_RIGHTS, etc), we must bump the
2825 * various sock-based usage counts.
2826 */
2827void __receive_sock(struct file *file)
2828{
2829 struct socket *sock;
2830 int error;
2831
2832 /*
2833 * The resulting value of "error" is ignored here since we only
2834 * need to take action when the file is a socket and testing
2835 * "sock" for NULL is sufficient.
2836 */
2837 sock = sock_from_file(file, &error);
2838 if (sock) {
2839 sock_update_netprioidx(&sock->sk->sk_cgrp_data);
2840 sock_update_classid(&sock->sk->sk_cgrp_data);
2841 }
2842}
2843
2844ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags)
2845{
2846 ssize_t res;
2847 struct msghdr msg = {.msg_flags = flags};
2848 struct kvec iov;
2849 char *kaddr = kmap(page);
2850 iov.iov_base = kaddr + offset;
2851 iov.iov_len = size;
2852 res = kernel_sendmsg(sock, &msg, &iov, 1, size);
2853 kunmap(page);
2854 return res;
2855}
2856EXPORT_SYMBOL(sock_no_sendpage);
2857
2858ssize_t sock_no_sendpage_locked(struct sock *sk, struct page *page,
2859 int offset, size_t size, int flags)
2860{
2861 ssize_t res;
2862 struct msghdr msg = {.msg_flags = flags};
2863 struct kvec iov;
2864 char *kaddr = kmap(page);
2865
2866 iov.iov_base = kaddr + offset;
2867 iov.iov_len = size;
2868 res = kernel_sendmsg_locked(sk, &msg, &iov, 1, size);
2869 kunmap(page);
2870 return res;
2871}
2872EXPORT_SYMBOL(sock_no_sendpage_locked);
2873
2874/*
2875 * Default Socket Callbacks
2876 */
2877
2878static void sock_def_wakeup(struct sock *sk)
2879{
2880 struct socket_wq *wq;
2881
2882 rcu_read_lock();
2883 wq = rcu_dereference(sk->sk_wq);
2884 if (skwq_has_sleeper(wq))
2885 wake_up_interruptible_all(&wq->wait);
2886 rcu_read_unlock();
2887}
2888
2889static void sock_def_error_report(struct sock *sk)
2890{
2891 struct socket_wq *wq;
2892
2893 rcu_read_lock();
2894 wq = rcu_dereference(sk->sk_wq);
2895 if (skwq_has_sleeper(wq))
2896 wake_up_interruptible_poll(&wq->wait, EPOLLERR);
2897 sk_wake_async(sk, SOCK_WAKE_IO, POLL_ERR);
2898 rcu_read_unlock();
2899}
2900
2901void sock_def_readable(struct sock *sk)
2902{
2903 struct socket_wq *wq;
2904
2905 rcu_read_lock();
2906 wq = rcu_dereference(sk->sk_wq);
2907 if (skwq_has_sleeper(wq))
2908 wake_up_interruptible_sync_poll(&wq->wait, EPOLLIN | EPOLLPRI |
2909 EPOLLRDNORM | EPOLLRDBAND);
2910 sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN);
2911 rcu_read_unlock();
2912}
2913
2914static void sock_def_write_space(struct sock *sk)
2915{
2916 struct socket_wq *wq;
2917
2918 rcu_read_lock();
2919
2920 /* Do not wake up a writer until he can make "significant"
2921 * progress. --DaveM
2922 */
2923 if ((refcount_read(&sk->sk_wmem_alloc) << 1) <= READ_ONCE(sk->sk_sndbuf)) {
2924 wq = rcu_dereference(sk->sk_wq);
2925 if (skwq_has_sleeper(wq))
2926 wake_up_interruptible_sync_poll(&wq->wait, EPOLLOUT |
2927 EPOLLWRNORM | EPOLLWRBAND);
2928
2929 /* Should agree with poll, otherwise some programs break */
2930 if (sock_writeable(sk))
2931 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
2932 }
2933
2934 rcu_read_unlock();
2935}
2936
2937static void sock_def_destruct(struct sock *sk)
2938{
2939}
2940
2941void sk_send_sigurg(struct sock *sk)
2942{
2943 if (sk->sk_socket && sk->sk_socket->file)
2944 if (send_sigurg(&sk->sk_socket->file->f_owner))
2945 sk_wake_async(sk, SOCK_WAKE_URG, POLL_PRI);
2946}
2947EXPORT_SYMBOL(sk_send_sigurg);
2948
2949void sk_reset_timer(struct sock *sk, struct timer_list* timer,
2950 unsigned long expires)
2951{
2952 if (!mod_timer(timer, expires))
2953 sock_hold(sk);
2954}
2955EXPORT_SYMBOL(sk_reset_timer);
2956
2957void sk_stop_timer(struct sock *sk, struct timer_list* timer)
2958{
2959 if (del_timer(timer))
2960 __sock_put(sk);
2961}
2962EXPORT_SYMBOL(sk_stop_timer);
2963
2964void sock_init_data(struct socket *sock, struct sock *sk)
2965{
2966 sk_init_common(sk);
2967 sk->sk_send_head = NULL;
2968
2969 timer_setup(&sk->sk_timer, NULL, 0);
2970
2971 sk->sk_allocation = GFP_KERNEL;
2972 sk->sk_rcvbuf = sysctl_rmem_default;
2973 sk->sk_sndbuf = sysctl_wmem_default;
2974 sk->sk_state = TCP_CLOSE;
2975 sk_set_socket(sk, sock);
2976
2977 sock_set_flag(sk, SOCK_ZAPPED);
2978
2979 if (sock) {
2980 sk->sk_type = sock->type;
2981 RCU_INIT_POINTER(sk->sk_wq, &sock->wq);
2982 sock->sk = sk;
2983 sk->sk_uid = SOCK_INODE(sock)->i_uid;
2984 } else {
2985 RCU_INIT_POINTER(sk->sk_wq, NULL);
2986 sk->sk_uid = make_kuid(sock_net(sk)->user_ns, 0);
2987 }
2988
2989 rwlock_init(&sk->sk_callback_lock);
2990 if (sk->sk_kern_sock)
2991 lockdep_set_class_and_name(
2992 &sk->sk_callback_lock,
2993 af_kern_callback_keys + sk->sk_family,
2994 af_family_kern_clock_key_strings[sk->sk_family]);
2995 else
2996 lockdep_set_class_and_name(
2997 &sk->sk_callback_lock,
2998 af_callback_keys + sk->sk_family,
2999 af_family_clock_key_strings[sk->sk_family]);
3000
3001 sk->sk_state_change = sock_def_wakeup;
3002 sk->sk_data_ready = sock_def_readable;
3003 sk->sk_write_space = sock_def_write_space;
3004 sk->sk_error_report = sock_def_error_report;
3005 sk->sk_destruct = sock_def_destruct;
3006
3007 sk->sk_frag.page = NULL;
3008 sk->sk_frag.offset = 0;
3009 sk->sk_peek_off = -1;
3010
3011 sk->sk_peer_pid = NULL;
3012 sk->sk_peer_cred = NULL;
3013 sk->sk_write_pending = 0;
3014 sk->sk_rcvlowat = 1;
3015 sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT;
3016 sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT;
3017
3018 sk->sk_stamp = SK_DEFAULT_STAMP;
3019#if BITS_PER_LONG==32
3020 seqlock_init(&sk->sk_stamp_seq);
3021#endif
3022 atomic_set(&sk->sk_zckey, 0);
3023
3024#ifdef CONFIG_NET_RX_BUSY_POLL
3025 sk->sk_napi_id = 0;
3026 sk->sk_ll_usec = sysctl_net_busy_read;
3027#endif
3028
3029 sk->sk_max_pacing_rate = ~0UL;
3030 sk->sk_pacing_rate = ~0UL;
3031 WRITE_ONCE(sk->sk_pacing_shift, 10);
3032 sk->sk_incoming_cpu = -1;
3033
3034 sk_rx_queue_clear(sk);
3035 /*
3036 * Before updating sk_refcnt, we must commit prior changes to memory
3037 * (Documentation/RCU/rculist_nulls.rst for details)
3038 */
3039 smp_wmb();
3040 refcount_set(&sk->sk_refcnt, 1);
3041 atomic_set(&sk->sk_drops, 0);
3042}
3043EXPORT_SYMBOL(sock_init_data);
3044
3045void lock_sock_nested(struct sock *sk, int subclass)
3046{
3047 might_sleep();
3048 spin_lock_bh(&sk->sk_lock.slock);
3049 if (sk->sk_lock.owned)
3050 __lock_sock(sk);
3051 sk->sk_lock.owned = 1;
3052 spin_unlock(&sk->sk_lock.slock);
3053 /*
3054 * The sk_lock has mutex_lock() semantics here:
3055 */
3056 mutex_acquire(&sk->sk_lock.dep_map, subclass, 0, _RET_IP_);
3057 local_bh_enable();
3058}
3059EXPORT_SYMBOL(lock_sock_nested);
3060
3061void release_sock(struct sock *sk)
3062{
3063 spin_lock_bh(&sk->sk_lock.slock);
3064 if (sk->sk_backlog.tail)
3065 __release_sock(sk);
3066
3067 /* Warning : release_cb() might need to release sk ownership,
3068 * ie call sock_release_ownership(sk) before us.
3069 */
3070 if (sk->sk_prot->release_cb)
3071 sk->sk_prot->release_cb(sk);
3072
3073 sock_release_ownership(sk);
3074 if (waitqueue_active(&sk->sk_lock.wq))
3075 wake_up(&sk->sk_lock.wq);
3076 spin_unlock_bh(&sk->sk_lock.slock);
3077}
3078EXPORT_SYMBOL(release_sock);
3079
3080/**
3081 * lock_sock_fast - fast version of lock_sock
3082 * @sk: socket
3083 *
3084 * This version should be used for very small section, where process wont block
3085 * return false if fast path is taken:
3086 *
3087 * sk_lock.slock locked, owned = 0, BH disabled
3088 *
3089 * return true if slow path is taken:
3090 *
3091 * sk_lock.slock unlocked, owned = 1, BH enabled
3092 */
3093bool lock_sock_fast(struct sock *sk)
3094{
3095 might_sleep();
3096 spin_lock_bh(&sk->sk_lock.slock);
3097
3098 if (!sk->sk_lock.owned)
3099 /*
3100 * Note : We must disable BH
3101 */
3102 return false;
3103
3104 __lock_sock(sk);
3105 sk->sk_lock.owned = 1;
3106 spin_unlock(&sk->sk_lock.slock);
3107 /*
3108 * The sk_lock has mutex_lock() semantics here:
3109 */
3110 mutex_acquire(&sk->sk_lock.dep_map, 0, 0, _RET_IP_);
3111 local_bh_enable();
3112 return true;
3113}
3114EXPORT_SYMBOL(lock_sock_fast);
3115
3116int sock_gettstamp(struct socket *sock, void __user *userstamp,
3117 bool timeval, bool time32)
3118{
3119 struct sock *sk = sock->sk;
3120 struct timespec64 ts;
3121
3122 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
3123 ts = ktime_to_timespec64(sock_read_timestamp(sk));
3124 if (ts.tv_sec == -1)
3125 return -ENOENT;
3126 if (ts.tv_sec == 0) {
3127 ktime_t kt = ktime_get_real();
3128 sock_write_timestamp(sk, kt);
3129 ts = ktime_to_timespec64(kt);
3130 }
3131
3132 if (timeval)
3133 ts.tv_nsec /= 1000;
3134
3135#ifdef CONFIG_COMPAT_32BIT_TIME
3136 if (time32)
3137 return put_old_timespec32(&ts, userstamp);
3138#endif
3139#ifdef CONFIG_SPARC64
3140 /* beware of padding in sparc64 timeval */
3141 if (timeval && !in_compat_syscall()) {
3142 struct __kernel_old_timeval __user tv = {
3143 .tv_sec = ts.tv_sec,
3144 .tv_usec = ts.tv_nsec,
3145 };
3146 if (copy_to_user(userstamp, &tv, sizeof(tv)))
3147 return -EFAULT;
3148 return 0;
3149 }
3150#endif
3151 return put_timespec64(&ts, userstamp);
3152}
3153EXPORT_SYMBOL(sock_gettstamp);
3154
3155void sock_enable_timestamp(struct sock *sk, enum sock_flags flag)
3156{
3157 if (!sock_flag(sk, flag)) {
3158 unsigned long previous_flags = sk->sk_flags;
3159
3160 sock_set_flag(sk, flag);
3161 /*
3162 * we just set one of the two flags which require net
3163 * time stamping, but time stamping might have been on
3164 * already because of the other one
3165 */
3166 if (sock_needs_netstamp(sk) &&
3167 !(previous_flags & SK_FLAGS_TIMESTAMP))
3168 net_enable_timestamp();
3169 }
3170}
3171
3172int sock_recv_errqueue(struct sock *sk, struct msghdr *msg, int len,
3173 int level, int type)
3174{
3175 struct sock_exterr_skb *serr;
3176 struct sk_buff *skb;
3177 int copied, err;
3178
3179 err = -EAGAIN;
3180 skb = sock_dequeue_err_skb(sk);
3181 if (skb == NULL)
3182 goto out;
3183
3184 copied = skb->len;
3185 if (copied > len) {
3186 msg->msg_flags |= MSG_TRUNC;
3187 copied = len;
3188 }
3189 err = skb_copy_datagram_msg(skb, 0, msg, copied);
3190 if (err)
3191 goto out_free_skb;
3192
3193 sock_recv_timestamp(msg, sk, skb);
3194
3195 serr = SKB_EXT_ERR(skb);
3196 put_cmsg(msg, level, type, sizeof(serr->ee), &serr->ee);
3197
3198 msg->msg_flags |= MSG_ERRQUEUE;
3199 err = copied;
3200
3201out_free_skb:
3202 kfree_skb(skb);
3203out:
3204 return err;
3205}
3206EXPORT_SYMBOL(sock_recv_errqueue);
3207
3208/*
3209 * Get a socket option on an socket.
3210 *
3211 * FIX: POSIX 1003.1g is very ambiguous here. It states that
3212 * asynchronous errors should be reported by getsockopt. We assume
3213 * this means if you specify SO_ERROR (otherwise whats the point of it).
3214 */
3215int sock_common_getsockopt(struct socket *sock, int level, int optname,
3216 char __user *optval, int __user *optlen)
3217{
3218 struct sock *sk = sock->sk;
3219
3220 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
3221}
3222EXPORT_SYMBOL(sock_common_getsockopt);
3223
3224int sock_common_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
3225 int flags)
3226{
3227 struct sock *sk = sock->sk;
3228 int addr_len = 0;
3229 int err;
3230
3231 err = sk->sk_prot->recvmsg(sk, msg, size, flags & MSG_DONTWAIT,
3232 flags & ~MSG_DONTWAIT, &addr_len);
3233 if (err >= 0)
3234 msg->msg_namelen = addr_len;
3235 return err;
3236}
3237EXPORT_SYMBOL(sock_common_recvmsg);
3238
3239/*
3240 * Set socket options on an inet socket.
3241 */
3242int sock_common_setsockopt(struct socket *sock, int level, int optname,
3243 sockptr_t optval, unsigned int optlen)
3244{
3245 struct sock *sk = sock->sk;
3246
3247 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
3248}
3249EXPORT_SYMBOL(sock_common_setsockopt);
3250
3251void sk_common_release(struct sock *sk)
3252{
3253 if (sk->sk_prot->destroy)
3254 sk->sk_prot->destroy(sk);
3255
3256 /*
3257 * Observation: when sk_common_release is called, processes have
3258 * no access to socket. But net still has.
3259 * Step one, detach it from networking:
3260 *
3261 * A. Remove from hash tables.
3262 */
3263
3264 sk->sk_prot->unhash(sk);
3265
3266 /*
3267 * In this point socket cannot receive new packets, but it is possible
3268 * that some packets are in flight because some CPU runs receiver and
3269 * did hash table lookup before we unhashed socket. They will achieve
3270 * receive queue and will be purged by socket destructor.
3271 *
3272 * Also we still have packets pending on receive queue and probably,
3273 * our own packets waiting in device queues. sock_destroy will drain
3274 * receive queue, but transmitted packets will delay socket destruction
3275 * until the last reference will be released.
3276 */
3277
3278 sock_orphan(sk);
3279
3280 xfrm_sk_free_policy(sk);
3281
3282 sk_refcnt_debug_release(sk);
3283
3284 sock_put(sk);
3285}
3286EXPORT_SYMBOL(sk_common_release);
3287
3288void sk_get_meminfo(const struct sock *sk, u32 *mem)
3289{
3290 memset(mem, 0, sizeof(*mem) * SK_MEMINFO_VARS);
3291
3292 mem[SK_MEMINFO_RMEM_ALLOC] = sk_rmem_alloc_get(sk);
3293 mem[SK_MEMINFO_RCVBUF] = READ_ONCE(sk->sk_rcvbuf);
3294 mem[SK_MEMINFO_WMEM_ALLOC] = sk_wmem_alloc_get(sk);
3295 mem[SK_MEMINFO_SNDBUF] = READ_ONCE(sk->sk_sndbuf);
3296 mem[SK_MEMINFO_FWD_ALLOC] = sk->sk_forward_alloc;
3297 mem[SK_MEMINFO_WMEM_QUEUED] = READ_ONCE(sk->sk_wmem_queued);
3298 mem[SK_MEMINFO_OPTMEM] = atomic_read(&sk->sk_omem_alloc);
3299 mem[SK_MEMINFO_BACKLOG] = READ_ONCE(sk->sk_backlog.len);
3300 mem[SK_MEMINFO_DROPS] = atomic_read(&sk->sk_drops);
3301}
3302
3303#ifdef CONFIG_PROC_FS
3304#define PROTO_INUSE_NR 64 /* should be enough for the first time */
3305struct prot_inuse {
3306 int val[PROTO_INUSE_NR];
3307};
3308
3309static DECLARE_BITMAP(proto_inuse_idx, PROTO_INUSE_NR);
3310
3311void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
3312{
3313 __this_cpu_add(net->core.prot_inuse->val[prot->inuse_idx], val);
3314}
3315EXPORT_SYMBOL_GPL(sock_prot_inuse_add);
3316
3317int sock_prot_inuse_get(struct net *net, struct proto *prot)
3318{
3319 int cpu, idx = prot->inuse_idx;
3320 int res = 0;
3321
3322 for_each_possible_cpu(cpu)
3323 res += per_cpu_ptr(net->core.prot_inuse, cpu)->val[idx];
3324
3325 return res >= 0 ? res : 0;
3326}
3327EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
3328
3329static void sock_inuse_add(struct net *net, int val)
3330{
3331 this_cpu_add(*net->core.sock_inuse, val);
3332}
3333
3334int sock_inuse_get(struct net *net)
3335{
3336 int cpu, res = 0;
3337
3338 for_each_possible_cpu(cpu)
3339 res += *per_cpu_ptr(net->core.sock_inuse, cpu);
3340
3341 return res;
3342}
3343
3344EXPORT_SYMBOL_GPL(sock_inuse_get);
3345
3346static int __net_init sock_inuse_init_net(struct net *net)
3347{
3348 net->core.prot_inuse = alloc_percpu(struct prot_inuse);
3349 if (net->core.prot_inuse == NULL)
3350 return -ENOMEM;
3351
3352 net->core.sock_inuse = alloc_percpu(int);
3353 if (net->core.sock_inuse == NULL)
3354 goto out;
3355
3356 return 0;
3357
3358out:
3359 free_percpu(net->core.prot_inuse);
3360 return -ENOMEM;
3361}
3362
3363static void __net_exit sock_inuse_exit_net(struct net *net)
3364{
3365 free_percpu(net->core.prot_inuse);
3366 free_percpu(net->core.sock_inuse);
3367}
3368
3369static struct pernet_operations net_inuse_ops = {
3370 .init = sock_inuse_init_net,
3371 .exit = sock_inuse_exit_net,
3372};
3373
3374static __init int net_inuse_init(void)
3375{
3376 if (register_pernet_subsys(&net_inuse_ops))
3377 panic("Cannot initialize net inuse counters");
3378
3379 return 0;
3380}
3381
3382core_initcall(net_inuse_init);
3383
3384static int assign_proto_idx(struct proto *prot)
3385{
3386 prot->inuse_idx = find_first_zero_bit(proto_inuse_idx, PROTO_INUSE_NR);
3387
3388 if (unlikely(prot->inuse_idx == PROTO_INUSE_NR - 1)) {
3389 pr_err("PROTO_INUSE_NR exhausted\n");
3390 return -ENOSPC;
3391 }
3392
3393 set_bit(prot->inuse_idx, proto_inuse_idx);
3394 return 0;
3395}
3396
3397static void release_proto_idx(struct proto *prot)
3398{
3399 if (prot->inuse_idx != PROTO_INUSE_NR - 1)
3400 clear_bit(prot->inuse_idx, proto_inuse_idx);
3401}
3402#else
3403static inline int assign_proto_idx(struct proto *prot)
3404{
3405 return 0;
3406}
3407
3408static inline void release_proto_idx(struct proto *prot)
3409{
3410}
3411
3412static void sock_inuse_add(struct net *net, int val)
3413{
3414}
3415#endif
3416
3417static void tw_prot_cleanup(struct timewait_sock_ops *twsk_prot)
3418{
3419 if (!twsk_prot)
3420 return;
3421 kfree(twsk_prot->twsk_slab_name);
3422 twsk_prot->twsk_slab_name = NULL;
3423 kmem_cache_destroy(twsk_prot->twsk_slab);
3424 twsk_prot->twsk_slab = NULL;
3425}
3426
3427static void req_prot_cleanup(struct request_sock_ops *rsk_prot)
3428{
3429 if (!rsk_prot)
3430 return;
3431 kfree(rsk_prot->slab_name);
3432 rsk_prot->slab_name = NULL;
3433 kmem_cache_destroy(rsk_prot->slab);
3434 rsk_prot->slab = NULL;
3435}
3436
3437static int req_prot_init(const struct proto *prot)
3438{
3439 struct request_sock_ops *rsk_prot = prot->rsk_prot;
3440
3441 if (!rsk_prot)
3442 return 0;
3443
3444 rsk_prot->slab_name = kasprintf(GFP_KERNEL, "request_sock_%s",
3445 prot->name);
3446 if (!rsk_prot->slab_name)
3447 return -ENOMEM;
3448
3449 rsk_prot->slab = kmem_cache_create(rsk_prot->slab_name,
3450 rsk_prot->obj_size, 0,
3451 SLAB_ACCOUNT | prot->slab_flags,
3452 NULL);
3453
3454 if (!rsk_prot->slab) {
3455 pr_crit("%s: Can't create request sock SLAB cache!\n",
3456 prot->name);
3457 return -ENOMEM;
3458 }
3459 return 0;
3460}
3461
3462int proto_register(struct proto *prot, int alloc_slab)
3463{
3464 int ret = -ENOBUFS;
3465
3466 if (alloc_slab) {
3467 prot->slab = kmem_cache_create_usercopy(prot->name,
3468 prot->obj_size, 0,
3469 SLAB_HWCACHE_ALIGN | SLAB_ACCOUNT |
3470 prot->slab_flags,
3471 prot->useroffset, prot->usersize,
3472 NULL);
3473
3474 if (prot->slab == NULL) {
3475 pr_crit("%s: Can't create sock SLAB cache!\n",
3476 prot->name);
3477 goto out;
3478 }
3479
3480 if (req_prot_init(prot))
3481 goto out_free_request_sock_slab;
3482
3483 if (prot->twsk_prot != NULL) {
3484 prot->twsk_prot->twsk_slab_name = kasprintf(GFP_KERNEL, "tw_sock_%s", prot->name);
3485
3486 if (prot->twsk_prot->twsk_slab_name == NULL)
3487 goto out_free_request_sock_slab;
3488
3489 prot->twsk_prot->twsk_slab =
3490 kmem_cache_create(prot->twsk_prot->twsk_slab_name,
3491 prot->twsk_prot->twsk_obj_size,
3492 0,
3493 SLAB_ACCOUNT |
3494 prot->slab_flags,
3495 NULL);
3496 if (prot->twsk_prot->twsk_slab == NULL)
3497 goto out_free_timewait_sock_slab;
3498 }
3499 }
3500
3501 mutex_lock(&proto_list_mutex);
3502 ret = assign_proto_idx(prot);
3503 if (ret) {
3504 mutex_unlock(&proto_list_mutex);
3505 goto out_free_timewait_sock_slab;
3506 }
3507 list_add(&prot->node, &proto_list);
3508 mutex_unlock(&proto_list_mutex);
3509 return ret;
3510
3511out_free_timewait_sock_slab:
3512 if (alloc_slab && prot->twsk_prot)
3513 tw_prot_cleanup(prot->twsk_prot);
3514out_free_request_sock_slab:
3515 if (alloc_slab) {
3516 req_prot_cleanup(prot->rsk_prot);
3517
3518 kmem_cache_destroy(prot->slab);
3519 prot->slab = NULL;
3520 }
3521out:
3522 return ret;
3523}
3524EXPORT_SYMBOL(proto_register);
3525
3526void proto_unregister(struct proto *prot)
3527{
3528 mutex_lock(&proto_list_mutex);
3529 release_proto_idx(prot);
3530 list_del(&prot->node);
3531 mutex_unlock(&proto_list_mutex);
3532
3533 kmem_cache_destroy(prot->slab);
3534 prot->slab = NULL;
3535
3536 req_prot_cleanup(prot->rsk_prot);
3537 tw_prot_cleanup(prot->twsk_prot);
3538}
3539EXPORT_SYMBOL(proto_unregister);
3540
3541int sock_load_diag_module(int family, int protocol)
3542{
3543 if (!protocol) {
3544 if (!sock_is_registered(family))
3545 return -ENOENT;
3546
3547 return request_module("net-pf-%d-proto-%d-type-%d", PF_NETLINK,
3548 NETLINK_SOCK_DIAG, family);
3549 }
3550
3551#ifdef CONFIG_INET
3552 if (family == AF_INET &&
3553 protocol != IPPROTO_RAW &&
3554 protocol < MAX_INET_PROTOS &&
3555 !rcu_access_pointer(inet_protos[protocol]))
3556 return -ENOENT;
3557#endif
3558
3559 return request_module("net-pf-%d-proto-%d-type-%d-%d", PF_NETLINK,
3560 NETLINK_SOCK_DIAG, family, protocol);
3561}
3562EXPORT_SYMBOL(sock_load_diag_module);
3563
3564#ifdef CONFIG_PROC_FS
3565static void *proto_seq_start(struct seq_file *seq, loff_t *pos)
3566 __acquires(proto_list_mutex)
3567{
3568 mutex_lock(&proto_list_mutex);
3569 return seq_list_start_head(&proto_list, *pos);
3570}
3571
3572static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3573{
3574 return seq_list_next(v, &proto_list, pos);
3575}
3576
3577static void proto_seq_stop(struct seq_file *seq, void *v)
3578 __releases(proto_list_mutex)
3579{
3580 mutex_unlock(&proto_list_mutex);
3581}
3582
3583static char proto_method_implemented(const void *method)
3584{
3585 return method == NULL ? 'n' : 'y';
3586}
3587static long sock_prot_memory_allocated(struct proto *proto)
3588{
3589 return proto->memory_allocated != NULL ? proto_memory_allocated(proto) : -1L;
3590}
3591
3592static const char *sock_prot_memory_pressure(struct proto *proto)
3593{
3594 return proto->memory_pressure != NULL ?
3595 proto_memory_pressure(proto) ? "yes" : "no" : "NI";
3596}
3597
3598static void proto_seq_printf(struct seq_file *seq, struct proto *proto)
3599{
3600
3601 seq_printf(seq, "%-9s %4u %6d %6ld %-3s %6u %-3s %-10s "
3602 "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n",
3603 proto->name,
3604 proto->obj_size,
3605 sock_prot_inuse_get(seq_file_net(seq), proto),
3606 sock_prot_memory_allocated(proto),
3607 sock_prot_memory_pressure(proto),
3608 proto->max_header,
3609 proto->slab == NULL ? "no" : "yes",
3610 module_name(proto->owner),
3611 proto_method_implemented(proto->close),
3612 proto_method_implemented(proto->connect),
3613 proto_method_implemented(proto->disconnect),
3614 proto_method_implemented(proto->accept),
3615 proto_method_implemented(proto->ioctl),
3616 proto_method_implemented(proto->init),
3617 proto_method_implemented(proto->destroy),
3618 proto_method_implemented(proto->shutdown),
3619 proto_method_implemented(proto->setsockopt),
3620 proto_method_implemented(proto->getsockopt),
3621 proto_method_implemented(proto->sendmsg),
3622 proto_method_implemented(proto->recvmsg),
3623 proto_method_implemented(proto->sendpage),
3624 proto_method_implemented(proto->bind),
3625 proto_method_implemented(proto->backlog_rcv),
3626 proto_method_implemented(proto->hash),
3627 proto_method_implemented(proto->unhash),
3628 proto_method_implemented(proto->get_port),
3629 proto_method_implemented(proto->enter_memory_pressure));
3630}
3631
3632static int proto_seq_show(struct seq_file *seq, void *v)
3633{
3634 if (v == &proto_list)
3635 seq_printf(seq, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s",
3636 "protocol",
3637 "size",
3638 "sockets",
3639 "memory",
3640 "press",
3641 "maxhdr",
3642 "slab",
3643 "module",
3644 "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n");
3645 else
3646 proto_seq_printf(seq, list_entry(v, struct proto, node));
3647 return 0;
3648}
3649
3650static const struct seq_operations proto_seq_ops = {
3651 .start = proto_seq_start,
3652 .next = proto_seq_next,
3653 .stop = proto_seq_stop,
3654 .show = proto_seq_show,
3655};
3656
3657static __net_init int proto_init_net(struct net *net)
3658{
3659 if (!proc_create_net("protocols", 0444, net->proc_net, &proto_seq_ops,
3660 sizeof(struct seq_net_private)))
3661 return -ENOMEM;
3662
3663 return 0;
3664}
3665
3666static __net_exit void proto_exit_net(struct net *net)
3667{
3668 remove_proc_entry("protocols", net->proc_net);
3669}
3670
3671
3672static __net_initdata struct pernet_operations proto_net_ops = {
3673 .init = proto_init_net,
3674 .exit = proto_exit_net,
3675};
3676
3677static int __init proto_init(void)
3678{
3679 return register_pernet_subsys(&proto_net_ops);
3680}
3681
3682subsys_initcall(proto_init);
3683
3684#endif /* PROC_FS */
3685
3686#ifdef CONFIG_NET_RX_BUSY_POLL
3687bool sk_busy_loop_end(void *p, unsigned long start_time)
3688{
3689 struct sock *sk = p;
3690
3691 return !skb_queue_empty_lockless(&sk->sk_receive_queue) ||
3692 sk_busy_loop_timeout(sk, start_time);
3693}
3694EXPORT_SYMBOL(sk_busy_loop_end);
3695#endif /* CONFIG_NET_RX_BUSY_POLL */
3696
3697int sock_bind_add(struct sock *sk, struct sockaddr *addr, int addr_len)
3698{
3699 if (!sk->sk_prot->bind_add)
3700 return -EOPNOTSUPP;
3701 return sk->sk_prot->bind_add(sk, addr, addr_len);
3702}
3703EXPORT_SYMBOL(sock_bind_add);
1/*
2 * INET An implementation of the TCP/IP protocol suite for the LINUX
3 * operating system. INET is implemented using the BSD Socket
4 * interface as the means of communication with the user level.
5 *
6 * Generic socket support routines. Memory allocators, socket lock/release
7 * handler for protocols to use and generic option handler.
8 *
9 *
10 * Authors: Ross Biro
11 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
12 * Florian La Roche, <flla@stud.uni-sb.de>
13 * Alan Cox, <A.Cox@swansea.ac.uk>
14 *
15 * Fixes:
16 * Alan Cox : Numerous verify_area() problems
17 * Alan Cox : Connecting on a connecting socket
18 * now returns an error for tcp.
19 * Alan Cox : sock->protocol is set correctly.
20 * and is not sometimes left as 0.
21 * Alan Cox : connect handles icmp errors on a
22 * connect properly. Unfortunately there
23 * is a restart syscall nasty there. I
24 * can't match BSD without hacking the C
25 * library. Ideas urgently sought!
26 * Alan Cox : Disallow bind() to addresses that are
27 * not ours - especially broadcast ones!!
28 * Alan Cox : Socket 1024 _IS_ ok for users. (fencepost)
29 * Alan Cox : sock_wfree/sock_rfree don't destroy sockets,
30 * instead they leave that for the DESTROY timer.
31 * Alan Cox : Clean up error flag in accept
32 * Alan Cox : TCP ack handling is buggy, the DESTROY timer
33 * was buggy. Put a remove_sock() in the handler
34 * for memory when we hit 0. Also altered the timer
35 * code. The ACK stuff can wait and needs major
36 * TCP layer surgery.
37 * Alan Cox : Fixed TCP ack bug, removed remove sock
38 * and fixed timer/inet_bh race.
39 * Alan Cox : Added zapped flag for TCP
40 * Alan Cox : Move kfree_skb into skbuff.c and tidied up surplus code
41 * Alan Cox : for new sk_buff allocations wmalloc/rmalloc now call alloc_skb
42 * Alan Cox : kfree_s calls now are kfree_skbmem so we can track skb resources
43 * Alan Cox : Supports socket option broadcast now as does udp. Packet and raw need fixing.
44 * Alan Cox : Added RCVBUF,SNDBUF size setting. It suddenly occurred to me how easy it was so...
45 * Rick Sladkey : Relaxed UDP rules for matching packets.
46 * C.E.Hawkins : IFF_PROMISC/SIOCGHWADDR support
47 * Pauline Middelink : identd support
48 * Alan Cox : Fixed connect() taking signals I think.
49 * Alan Cox : SO_LINGER supported
50 * Alan Cox : Error reporting fixes
51 * Anonymous : inet_create tidied up (sk->reuse setting)
52 * Alan Cox : inet sockets don't set sk->type!
53 * Alan Cox : Split socket option code
54 * Alan Cox : Callbacks
55 * Alan Cox : Nagle flag for Charles & Johannes stuff
56 * Alex : Removed restriction on inet fioctl
57 * Alan Cox : Splitting INET from NET core
58 * Alan Cox : Fixed bogus SO_TYPE handling in getsockopt()
59 * Adam Caldwell : Missing return in SO_DONTROUTE/SO_DEBUG code
60 * Alan Cox : Split IP from generic code
61 * Alan Cox : New kfree_skbmem()
62 * Alan Cox : Make SO_DEBUG superuser only.
63 * Alan Cox : Allow anyone to clear SO_DEBUG
64 * (compatibility fix)
65 * Alan Cox : Added optimistic memory grabbing for AF_UNIX throughput.
66 * Alan Cox : Allocator for a socket is settable.
67 * Alan Cox : SO_ERROR includes soft errors.
68 * Alan Cox : Allow NULL arguments on some SO_ opts
69 * Alan Cox : Generic socket allocation to make hooks
70 * easier (suggested by Craig Metz).
71 * Michael Pall : SO_ERROR returns positive errno again
72 * Steve Whitehouse: Added default destructor to free
73 * protocol private data.
74 * Steve Whitehouse: Added various other default routines
75 * common to several socket families.
76 * Chris Evans : Call suser() check last on F_SETOWN
77 * Jay Schulist : Added SO_ATTACH_FILTER and SO_DETACH_FILTER.
78 * Andi Kleen : Add sock_kmalloc()/sock_kfree_s()
79 * Andi Kleen : Fix write_space callback
80 * Chris Evans : Security fixes - signedness again
81 * Arnaldo C. Melo : cleanups, use skb_queue_purge
82 *
83 * To Fix:
84 *
85 *
86 * This program is free software; you can redistribute it and/or
87 * modify it under the terms of the GNU General Public License
88 * as published by the Free Software Foundation; either version
89 * 2 of the License, or (at your option) any later version.
90 */
91
92#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
93
94#include <linux/capability.h>
95#include <linux/errno.h>
96#include <linux/types.h>
97#include <linux/socket.h>
98#include <linux/in.h>
99#include <linux/kernel.h>
100#include <linux/module.h>
101#include <linux/proc_fs.h>
102#include <linux/seq_file.h>
103#include <linux/sched.h>
104#include <linux/timer.h>
105#include <linux/string.h>
106#include <linux/sockios.h>
107#include <linux/net.h>
108#include <linux/mm.h>
109#include <linux/slab.h>
110#include <linux/interrupt.h>
111#include <linux/poll.h>
112#include <linux/tcp.h>
113#include <linux/init.h>
114#include <linux/highmem.h>
115#include <linux/user_namespace.h>
116#include <linux/static_key.h>
117#include <linux/memcontrol.h>
118#include <linux/prefetch.h>
119
120#include <asm/uaccess.h>
121
122#include <linux/netdevice.h>
123#include <net/protocol.h>
124#include <linux/skbuff.h>
125#include <net/net_namespace.h>
126#include <net/request_sock.h>
127#include <net/sock.h>
128#include <linux/net_tstamp.h>
129#include <net/xfrm.h>
130#include <linux/ipsec.h>
131#include <net/cls_cgroup.h>
132#include <net/netprio_cgroup.h>
133
134#include <linux/filter.h>
135
136#include <trace/events/sock.h>
137
138#ifdef CONFIG_INET
139#include <net/tcp.h>
140#endif
141
142static DEFINE_MUTEX(proto_list_mutex);
143static LIST_HEAD(proto_list);
144
145#ifdef CONFIG_CGROUP_MEM_RES_CTLR_KMEM
146int mem_cgroup_sockets_init(struct mem_cgroup *memcg, struct cgroup_subsys *ss)
147{
148 struct proto *proto;
149 int ret = 0;
150
151 mutex_lock(&proto_list_mutex);
152 list_for_each_entry(proto, &proto_list, node) {
153 if (proto->init_cgroup) {
154 ret = proto->init_cgroup(memcg, ss);
155 if (ret)
156 goto out;
157 }
158 }
159
160 mutex_unlock(&proto_list_mutex);
161 return ret;
162out:
163 list_for_each_entry_continue_reverse(proto, &proto_list, node)
164 if (proto->destroy_cgroup)
165 proto->destroy_cgroup(memcg);
166 mutex_unlock(&proto_list_mutex);
167 return ret;
168}
169
170void mem_cgroup_sockets_destroy(struct mem_cgroup *memcg)
171{
172 struct proto *proto;
173
174 mutex_lock(&proto_list_mutex);
175 list_for_each_entry_reverse(proto, &proto_list, node)
176 if (proto->destroy_cgroup)
177 proto->destroy_cgroup(memcg);
178 mutex_unlock(&proto_list_mutex);
179}
180#endif
181
182/*
183 * Each address family might have different locking rules, so we have
184 * one slock key per address family:
185 */
186static struct lock_class_key af_family_keys[AF_MAX];
187static struct lock_class_key af_family_slock_keys[AF_MAX];
188
189struct static_key memcg_socket_limit_enabled;
190EXPORT_SYMBOL(memcg_socket_limit_enabled);
191
192/*
193 * Make lock validator output more readable. (we pre-construct these
194 * strings build-time, so that runtime initialization of socket
195 * locks is fast):
196 */
197static const char *const af_family_key_strings[AF_MAX+1] = {
198 "sk_lock-AF_UNSPEC", "sk_lock-AF_UNIX" , "sk_lock-AF_INET" ,
199 "sk_lock-AF_AX25" , "sk_lock-AF_IPX" , "sk_lock-AF_APPLETALK",
200 "sk_lock-AF_NETROM", "sk_lock-AF_BRIDGE" , "sk_lock-AF_ATMPVC" ,
201 "sk_lock-AF_X25" , "sk_lock-AF_INET6" , "sk_lock-AF_ROSE" ,
202 "sk_lock-AF_DECnet", "sk_lock-AF_NETBEUI" , "sk_lock-AF_SECURITY" ,
203 "sk_lock-AF_KEY" , "sk_lock-AF_NETLINK" , "sk_lock-AF_PACKET" ,
204 "sk_lock-AF_ASH" , "sk_lock-AF_ECONET" , "sk_lock-AF_ATMSVC" ,
205 "sk_lock-AF_RDS" , "sk_lock-AF_SNA" , "sk_lock-AF_IRDA" ,
206 "sk_lock-AF_PPPOX" , "sk_lock-AF_WANPIPE" , "sk_lock-AF_LLC" ,
207 "sk_lock-27" , "sk_lock-28" , "sk_lock-AF_CAN" ,
208 "sk_lock-AF_TIPC" , "sk_lock-AF_BLUETOOTH", "sk_lock-IUCV" ,
209 "sk_lock-AF_RXRPC" , "sk_lock-AF_ISDN" , "sk_lock-AF_PHONET" ,
210 "sk_lock-AF_IEEE802154", "sk_lock-AF_CAIF" , "sk_lock-AF_ALG" ,
211 "sk_lock-AF_NFC" , "sk_lock-AF_MAX"
212};
213static const char *const af_family_slock_key_strings[AF_MAX+1] = {
214 "slock-AF_UNSPEC", "slock-AF_UNIX" , "slock-AF_INET" ,
215 "slock-AF_AX25" , "slock-AF_IPX" , "slock-AF_APPLETALK",
216 "slock-AF_NETROM", "slock-AF_BRIDGE" , "slock-AF_ATMPVC" ,
217 "slock-AF_X25" , "slock-AF_INET6" , "slock-AF_ROSE" ,
218 "slock-AF_DECnet", "slock-AF_NETBEUI" , "slock-AF_SECURITY" ,
219 "slock-AF_KEY" , "slock-AF_NETLINK" , "slock-AF_PACKET" ,
220 "slock-AF_ASH" , "slock-AF_ECONET" , "slock-AF_ATMSVC" ,
221 "slock-AF_RDS" , "slock-AF_SNA" , "slock-AF_IRDA" ,
222 "slock-AF_PPPOX" , "slock-AF_WANPIPE" , "slock-AF_LLC" ,
223 "slock-27" , "slock-28" , "slock-AF_CAN" ,
224 "slock-AF_TIPC" , "slock-AF_BLUETOOTH", "slock-AF_IUCV" ,
225 "slock-AF_RXRPC" , "slock-AF_ISDN" , "slock-AF_PHONET" ,
226 "slock-AF_IEEE802154", "slock-AF_CAIF" , "slock-AF_ALG" ,
227 "slock-AF_NFC" , "slock-AF_MAX"
228};
229static const char *const af_family_clock_key_strings[AF_MAX+1] = {
230 "clock-AF_UNSPEC", "clock-AF_UNIX" , "clock-AF_INET" ,
231 "clock-AF_AX25" , "clock-AF_IPX" , "clock-AF_APPLETALK",
232 "clock-AF_NETROM", "clock-AF_BRIDGE" , "clock-AF_ATMPVC" ,
233 "clock-AF_X25" , "clock-AF_INET6" , "clock-AF_ROSE" ,
234 "clock-AF_DECnet", "clock-AF_NETBEUI" , "clock-AF_SECURITY" ,
235 "clock-AF_KEY" , "clock-AF_NETLINK" , "clock-AF_PACKET" ,
236 "clock-AF_ASH" , "clock-AF_ECONET" , "clock-AF_ATMSVC" ,
237 "clock-AF_RDS" , "clock-AF_SNA" , "clock-AF_IRDA" ,
238 "clock-AF_PPPOX" , "clock-AF_WANPIPE" , "clock-AF_LLC" ,
239 "clock-27" , "clock-28" , "clock-AF_CAN" ,
240 "clock-AF_TIPC" , "clock-AF_BLUETOOTH", "clock-AF_IUCV" ,
241 "clock-AF_RXRPC" , "clock-AF_ISDN" , "clock-AF_PHONET" ,
242 "clock-AF_IEEE802154", "clock-AF_CAIF" , "clock-AF_ALG" ,
243 "clock-AF_NFC" , "clock-AF_MAX"
244};
245
246/*
247 * sk_callback_lock locking rules are per-address-family,
248 * so split the lock classes by using a per-AF key:
249 */
250static struct lock_class_key af_callback_keys[AF_MAX];
251
252/* Take into consideration the size of the struct sk_buff overhead in the
253 * determination of these values, since that is non-constant across
254 * platforms. This makes socket queueing behavior and performance
255 * not depend upon such differences.
256 */
257#define _SK_MEM_PACKETS 256
258#define _SK_MEM_OVERHEAD SKB_TRUESIZE(256)
259#define SK_WMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS)
260#define SK_RMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS)
261
262/* Run time adjustable parameters. */
263__u32 sysctl_wmem_max __read_mostly = SK_WMEM_MAX;
264EXPORT_SYMBOL(sysctl_wmem_max);
265__u32 sysctl_rmem_max __read_mostly = SK_RMEM_MAX;
266EXPORT_SYMBOL(sysctl_rmem_max);
267__u32 sysctl_wmem_default __read_mostly = SK_WMEM_MAX;
268__u32 sysctl_rmem_default __read_mostly = SK_RMEM_MAX;
269
270/* Maximal space eaten by iovec or ancillary data plus some space */
271int sysctl_optmem_max __read_mostly = sizeof(unsigned long)*(2*UIO_MAXIOV+512);
272EXPORT_SYMBOL(sysctl_optmem_max);
273
274#if defined(CONFIG_CGROUPS)
275#if !defined(CONFIG_NET_CLS_CGROUP)
276int net_cls_subsys_id = -1;
277EXPORT_SYMBOL_GPL(net_cls_subsys_id);
278#endif
279#if !defined(CONFIG_NETPRIO_CGROUP)
280int net_prio_subsys_id = -1;
281EXPORT_SYMBOL_GPL(net_prio_subsys_id);
282#endif
283#endif
284
285static int sock_set_timeout(long *timeo_p, char __user *optval, int optlen)
286{
287 struct timeval tv;
288
289 if (optlen < sizeof(tv))
290 return -EINVAL;
291 if (copy_from_user(&tv, optval, sizeof(tv)))
292 return -EFAULT;
293 if (tv.tv_usec < 0 || tv.tv_usec >= USEC_PER_SEC)
294 return -EDOM;
295
296 if (tv.tv_sec < 0) {
297 static int warned __read_mostly;
298
299 *timeo_p = 0;
300 if (warned < 10 && net_ratelimit()) {
301 warned++;
302 pr_info("%s: `%s' (pid %d) tries to set negative timeout\n",
303 __func__, current->comm, task_pid_nr(current));
304 }
305 return 0;
306 }
307 *timeo_p = MAX_SCHEDULE_TIMEOUT;
308 if (tv.tv_sec == 0 && tv.tv_usec == 0)
309 return 0;
310 if (tv.tv_sec < (MAX_SCHEDULE_TIMEOUT/HZ - 1))
311 *timeo_p = tv.tv_sec*HZ + (tv.tv_usec+(1000000/HZ-1))/(1000000/HZ);
312 return 0;
313}
314
315static void sock_warn_obsolete_bsdism(const char *name)
316{
317 static int warned;
318 static char warncomm[TASK_COMM_LEN];
319 if (strcmp(warncomm, current->comm) && warned < 5) {
320 strcpy(warncomm, current->comm);
321 pr_warn("process `%s' is using obsolete %s SO_BSDCOMPAT\n",
322 warncomm, name);
323 warned++;
324 }
325}
326
327#define SK_FLAGS_TIMESTAMP ((1UL << SOCK_TIMESTAMP) | (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE))
328
329static void sock_disable_timestamp(struct sock *sk, unsigned long flags)
330{
331 if (sk->sk_flags & flags) {
332 sk->sk_flags &= ~flags;
333 if (!(sk->sk_flags & SK_FLAGS_TIMESTAMP))
334 net_disable_timestamp();
335 }
336}
337
338
339int sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
340{
341 int err;
342 int skb_len;
343 unsigned long flags;
344 struct sk_buff_head *list = &sk->sk_receive_queue;
345
346 if (atomic_read(&sk->sk_rmem_alloc) >= sk->sk_rcvbuf) {
347 atomic_inc(&sk->sk_drops);
348 trace_sock_rcvqueue_full(sk, skb);
349 return -ENOMEM;
350 }
351
352 err = sk_filter(sk, skb);
353 if (err)
354 return err;
355
356 if (!sk_rmem_schedule(sk, skb->truesize)) {
357 atomic_inc(&sk->sk_drops);
358 return -ENOBUFS;
359 }
360
361 skb->dev = NULL;
362 skb_set_owner_r(skb, sk);
363
364 /* Cache the SKB length before we tack it onto the receive
365 * queue. Once it is added it no longer belongs to us and
366 * may be freed by other threads of control pulling packets
367 * from the queue.
368 */
369 skb_len = skb->len;
370
371 /* we escape from rcu protected region, make sure we dont leak
372 * a norefcounted dst
373 */
374 skb_dst_force(skb);
375
376 spin_lock_irqsave(&list->lock, flags);
377 skb->dropcount = atomic_read(&sk->sk_drops);
378 __skb_queue_tail(list, skb);
379 spin_unlock_irqrestore(&list->lock, flags);
380
381 if (!sock_flag(sk, SOCK_DEAD))
382 sk->sk_data_ready(sk, skb_len);
383 return 0;
384}
385EXPORT_SYMBOL(sock_queue_rcv_skb);
386
387int sk_receive_skb(struct sock *sk, struct sk_buff *skb, const int nested)
388{
389 int rc = NET_RX_SUCCESS;
390
391 if (sk_filter(sk, skb))
392 goto discard_and_relse;
393
394 skb->dev = NULL;
395
396 if (sk_rcvqueues_full(sk, skb, sk->sk_rcvbuf)) {
397 atomic_inc(&sk->sk_drops);
398 goto discard_and_relse;
399 }
400 if (nested)
401 bh_lock_sock_nested(sk);
402 else
403 bh_lock_sock(sk);
404 if (!sock_owned_by_user(sk)) {
405 /*
406 * trylock + unlock semantics:
407 */
408 mutex_acquire(&sk->sk_lock.dep_map, 0, 1, _RET_IP_);
409
410 rc = sk_backlog_rcv(sk, skb);
411
412 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_);
413 } else if (sk_add_backlog(sk, skb, sk->sk_rcvbuf)) {
414 bh_unlock_sock(sk);
415 atomic_inc(&sk->sk_drops);
416 goto discard_and_relse;
417 }
418
419 bh_unlock_sock(sk);
420out:
421 sock_put(sk);
422 return rc;
423discard_and_relse:
424 kfree_skb(skb);
425 goto out;
426}
427EXPORT_SYMBOL(sk_receive_skb);
428
429void sk_reset_txq(struct sock *sk)
430{
431 sk_tx_queue_clear(sk);
432}
433EXPORT_SYMBOL(sk_reset_txq);
434
435struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie)
436{
437 struct dst_entry *dst = __sk_dst_get(sk);
438
439 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
440 sk_tx_queue_clear(sk);
441 RCU_INIT_POINTER(sk->sk_dst_cache, NULL);
442 dst_release(dst);
443 return NULL;
444 }
445
446 return dst;
447}
448EXPORT_SYMBOL(__sk_dst_check);
449
450struct dst_entry *sk_dst_check(struct sock *sk, u32 cookie)
451{
452 struct dst_entry *dst = sk_dst_get(sk);
453
454 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
455 sk_dst_reset(sk);
456 dst_release(dst);
457 return NULL;
458 }
459
460 return dst;
461}
462EXPORT_SYMBOL(sk_dst_check);
463
464static int sock_bindtodevice(struct sock *sk, char __user *optval, int optlen)
465{
466 int ret = -ENOPROTOOPT;
467#ifdef CONFIG_NETDEVICES
468 struct net *net = sock_net(sk);
469 char devname[IFNAMSIZ];
470 int index;
471
472 /* Sorry... */
473 ret = -EPERM;
474 if (!capable(CAP_NET_RAW))
475 goto out;
476
477 ret = -EINVAL;
478 if (optlen < 0)
479 goto out;
480
481 /* Bind this socket to a particular device like "eth0",
482 * as specified in the passed interface name. If the
483 * name is "" or the option length is zero the socket
484 * is not bound.
485 */
486 if (optlen > IFNAMSIZ - 1)
487 optlen = IFNAMSIZ - 1;
488 memset(devname, 0, sizeof(devname));
489
490 ret = -EFAULT;
491 if (copy_from_user(devname, optval, optlen))
492 goto out;
493
494 index = 0;
495 if (devname[0] != '\0') {
496 struct net_device *dev;
497
498 rcu_read_lock();
499 dev = dev_get_by_name_rcu(net, devname);
500 if (dev)
501 index = dev->ifindex;
502 rcu_read_unlock();
503 ret = -ENODEV;
504 if (!dev)
505 goto out;
506 }
507
508 lock_sock(sk);
509 sk->sk_bound_dev_if = index;
510 sk_dst_reset(sk);
511 release_sock(sk);
512
513 ret = 0;
514
515out:
516#endif
517
518 return ret;
519}
520
521static inline void sock_valbool_flag(struct sock *sk, int bit, int valbool)
522{
523 if (valbool)
524 sock_set_flag(sk, bit);
525 else
526 sock_reset_flag(sk, bit);
527}
528
529/*
530 * This is meant for all protocols to use and covers goings on
531 * at the socket level. Everything here is generic.
532 */
533
534int sock_setsockopt(struct socket *sock, int level, int optname,
535 char __user *optval, unsigned int optlen)
536{
537 struct sock *sk = sock->sk;
538 int val;
539 int valbool;
540 struct linger ling;
541 int ret = 0;
542
543 /*
544 * Options without arguments
545 */
546
547 if (optname == SO_BINDTODEVICE)
548 return sock_bindtodevice(sk, optval, optlen);
549
550 if (optlen < sizeof(int))
551 return -EINVAL;
552
553 if (get_user(val, (int __user *)optval))
554 return -EFAULT;
555
556 valbool = val ? 1 : 0;
557
558 lock_sock(sk);
559
560 switch (optname) {
561 case SO_DEBUG:
562 if (val && !capable(CAP_NET_ADMIN))
563 ret = -EACCES;
564 else
565 sock_valbool_flag(sk, SOCK_DBG, valbool);
566 break;
567 case SO_REUSEADDR:
568 sk->sk_reuse = (valbool ? SK_CAN_REUSE : SK_NO_REUSE);
569 break;
570 case SO_TYPE:
571 case SO_PROTOCOL:
572 case SO_DOMAIN:
573 case SO_ERROR:
574 ret = -ENOPROTOOPT;
575 break;
576 case SO_DONTROUTE:
577 sock_valbool_flag(sk, SOCK_LOCALROUTE, valbool);
578 break;
579 case SO_BROADCAST:
580 sock_valbool_flag(sk, SOCK_BROADCAST, valbool);
581 break;
582 case SO_SNDBUF:
583 /* Don't error on this BSD doesn't and if you think
584 * about it this is right. Otherwise apps have to
585 * play 'guess the biggest size' games. RCVBUF/SNDBUF
586 * are treated in BSD as hints
587 */
588 val = min_t(u32, val, sysctl_wmem_max);
589set_sndbuf:
590 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
591 sk->sk_sndbuf = max_t(u32, val * 2, SOCK_MIN_SNDBUF);
592 /* Wake up sending tasks if we upped the value. */
593 sk->sk_write_space(sk);
594 break;
595
596 case SO_SNDBUFFORCE:
597 if (!capable(CAP_NET_ADMIN)) {
598 ret = -EPERM;
599 break;
600 }
601 goto set_sndbuf;
602
603 case SO_RCVBUF:
604 /* Don't error on this BSD doesn't and if you think
605 * about it this is right. Otherwise apps have to
606 * play 'guess the biggest size' games. RCVBUF/SNDBUF
607 * are treated in BSD as hints
608 */
609 val = min_t(u32, val, sysctl_rmem_max);
610set_rcvbuf:
611 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
612 /*
613 * We double it on the way in to account for
614 * "struct sk_buff" etc. overhead. Applications
615 * assume that the SO_RCVBUF setting they make will
616 * allow that much actual data to be received on that
617 * socket.
618 *
619 * Applications are unaware that "struct sk_buff" and
620 * other overheads allocate from the receive buffer
621 * during socket buffer allocation.
622 *
623 * And after considering the possible alternatives,
624 * returning the value we actually used in getsockopt
625 * is the most desirable behavior.
626 */
627 sk->sk_rcvbuf = max_t(u32, val * 2, SOCK_MIN_RCVBUF);
628 break;
629
630 case SO_RCVBUFFORCE:
631 if (!capable(CAP_NET_ADMIN)) {
632 ret = -EPERM;
633 break;
634 }
635 goto set_rcvbuf;
636
637 case SO_KEEPALIVE:
638#ifdef CONFIG_INET
639 if (sk->sk_protocol == IPPROTO_TCP)
640 tcp_set_keepalive(sk, valbool);
641#endif
642 sock_valbool_flag(sk, SOCK_KEEPOPEN, valbool);
643 break;
644
645 case SO_OOBINLINE:
646 sock_valbool_flag(sk, SOCK_URGINLINE, valbool);
647 break;
648
649 case SO_NO_CHECK:
650 sk->sk_no_check = valbool;
651 break;
652
653 case SO_PRIORITY:
654 if ((val >= 0 && val <= 6) || capable(CAP_NET_ADMIN))
655 sk->sk_priority = val;
656 else
657 ret = -EPERM;
658 break;
659
660 case SO_LINGER:
661 if (optlen < sizeof(ling)) {
662 ret = -EINVAL; /* 1003.1g */
663 break;
664 }
665 if (copy_from_user(&ling, optval, sizeof(ling))) {
666 ret = -EFAULT;
667 break;
668 }
669 if (!ling.l_onoff)
670 sock_reset_flag(sk, SOCK_LINGER);
671 else {
672#if (BITS_PER_LONG == 32)
673 if ((unsigned int)ling.l_linger >= MAX_SCHEDULE_TIMEOUT/HZ)
674 sk->sk_lingertime = MAX_SCHEDULE_TIMEOUT;
675 else
676#endif
677 sk->sk_lingertime = (unsigned int)ling.l_linger * HZ;
678 sock_set_flag(sk, SOCK_LINGER);
679 }
680 break;
681
682 case SO_BSDCOMPAT:
683 sock_warn_obsolete_bsdism("setsockopt");
684 break;
685
686 case SO_PASSCRED:
687 if (valbool)
688 set_bit(SOCK_PASSCRED, &sock->flags);
689 else
690 clear_bit(SOCK_PASSCRED, &sock->flags);
691 break;
692
693 case SO_TIMESTAMP:
694 case SO_TIMESTAMPNS:
695 if (valbool) {
696 if (optname == SO_TIMESTAMP)
697 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
698 else
699 sock_set_flag(sk, SOCK_RCVTSTAMPNS);
700 sock_set_flag(sk, SOCK_RCVTSTAMP);
701 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
702 } else {
703 sock_reset_flag(sk, SOCK_RCVTSTAMP);
704 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
705 }
706 break;
707
708 case SO_TIMESTAMPING:
709 if (val & ~SOF_TIMESTAMPING_MASK) {
710 ret = -EINVAL;
711 break;
712 }
713 sock_valbool_flag(sk, SOCK_TIMESTAMPING_TX_HARDWARE,
714 val & SOF_TIMESTAMPING_TX_HARDWARE);
715 sock_valbool_flag(sk, SOCK_TIMESTAMPING_TX_SOFTWARE,
716 val & SOF_TIMESTAMPING_TX_SOFTWARE);
717 sock_valbool_flag(sk, SOCK_TIMESTAMPING_RX_HARDWARE,
718 val & SOF_TIMESTAMPING_RX_HARDWARE);
719 if (val & SOF_TIMESTAMPING_RX_SOFTWARE)
720 sock_enable_timestamp(sk,
721 SOCK_TIMESTAMPING_RX_SOFTWARE);
722 else
723 sock_disable_timestamp(sk,
724 (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE));
725 sock_valbool_flag(sk, SOCK_TIMESTAMPING_SOFTWARE,
726 val & SOF_TIMESTAMPING_SOFTWARE);
727 sock_valbool_flag(sk, SOCK_TIMESTAMPING_SYS_HARDWARE,
728 val & SOF_TIMESTAMPING_SYS_HARDWARE);
729 sock_valbool_flag(sk, SOCK_TIMESTAMPING_RAW_HARDWARE,
730 val & SOF_TIMESTAMPING_RAW_HARDWARE);
731 break;
732
733 case SO_RCVLOWAT:
734 if (val < 0)
735 val = INT_MAX;
736 sk->sk_rcvlowat = val ? : 1;
737 break;
738
739 case SO_RCVTIMEO:
740 ret = sock_set_timeout(&sk->sk_rcvtimeo, optval, optlen);
741 break;
742
743 case SO_SNDTIMEO:
744 ret = sock_set_timeout(&sk->sk_sndtimeo, optval, optlen);
745 break;
746
747 case SO_ATTACH_FILTER:
748 ret = -EINVAL;
749 if (optlen == sizeof(struct sock_fprog)) {
750 struct sock_fprog fprog;
751
752 ret = -EFAULT;
753 if (copy_from_user(&fprog, optval, sizeof(fprog)))
754 break;
755
756 ret = sk_attach_filter(&fprog, sk);
757 }
758 break;
759
760 case SO_DETACH_FILTER:
761 ret = sk_detach_filter(sk);
762 break;
763
764 case SO_PASSSEC:
765 if (valbool)
766 set_bit(SOCK_PASSSEC, &sock->flags);
767 else
768 clear_bit(SOCK_PASSSEC, &sock->flags);
769 break;
770 case SO_MARK:
771 if (!capable(CAP_NET_ADMIN))
772 ret = -EPERM;
773 else
774 sk->sk_mark = val;
775 break;
776
777 /* We implement the SO_SNDLOWAT etc to
778 not be settable (1003.1g 5.3) */
779 case SO_RXQ_OVFL:
780 sock_valbool_flag(sk, SOCK_RXQ_OVFL, valbool);
781 break;
782
783 case SO_WIFI_STATUS:
784 sock_valbool_flag(sk, SOCK_WIFI_STATUS, valbool);
785 break;
786
787 case SO_PEEK_OFF:
788 if (sock->ops->set_peek_off)
789 sock->ops->set_peek_off(sk, val);
790 else
791 ret = -EOPNOTSUPP;
792 break;
793
794 case SO_NOFCS:
795 sock_valbool_flag(sk, SOCK_NOFCS, valbool);
796 break;
797
798 default:
799 ret = -ENOPROTOOPT;
800 break;
801 }
802 release_sock(sk);
803 return ret;
804}
805EXPORT_SYMBOL(sock_setsockopt);
806
807
808void cred_to_ucred(struct pid *pid, const struct cred *cred,
809 struct ucred *ucred)
810{
811 ucred->pid = pid_vnr(pid);
812 ucred->uid = ucred->gid = -1;
813 if (cred) {
814 struct user_namespace *current_ns = current_user_ns();
815
816 ucred->uid = from_kuid(current_ns, cred->euid);
817 ucred->gid = from_kgid(current_ns, cred->egid);
818 }
819}
820EXPORT_SYMBOL_GPL(cred_to_ucred);
821
822int sock_getsockopt(struct socket *sock, int level, int optname,
823 char __user *optval, int __user *optlen)
824{
825 struct sock *sk = sock->sk;
826
827 union {
828 int val;
829 struct linger ling;
830 struct timeval tm;
831 } v;
832
833 int lv = sizeof(int);
834 int len;
835
836 if (get_user(len, optlen))
837 return -EFAULT;
838 if (len < 0)
839 return -EINVAL;
840
841 memset(&v, 0, sizeof(v));
842
843 switch (optname) {
844 case SO_DEBUG:
845 v.val = sock_flag(sk, SOCK_DBG);
846 break;
847
848 case SO_DONTROUTE:
849 v.val = sock_flag(sk, SOCK_LOCALROUTE);
850 break;
851
852 case SO_BROADCAST:
853 v.val = sock_flag(sk, SOCK_BROADCAST);
854 break;
855
856 case SO_SNDBUF:
857 v.val = sk->sk_sndbuf;
858 break;
859
860 case SO_RCVBUF:
861 v.val = sk->sk_rcvbuf;
862 break;
863
864 case SO_REUSEADDR:
865 v.val = sk->sk_reuse;
866 break;
867
868 case SO_KEEPALIVE:
869 v.val = sock_flag(sk, SOCK_KEEPOPEN);
870 break;
871
872 case SO_TYPE:
873 v.val = sk->sk_type;
874 break;
875
876 case SO_PROTOCOL:
877 v.val = sk->sk_protocol;
878 break;
879
880 case SO_DOMAIN:
881 v.val = sk->sk_family;
882 break;
883
884 case SO_ERROR:
885 v.val = -sock_error(sk);
886 if (v.val == 0)
887 v.val = xchg(&sk->sk_err_soft, 0);
888 break;
889
890 case SO_OOBINLINE:
891 v.val = sock_flag(sk, SOCK_URGINLINE);
892 break;
893
894 case SO_NO_CHECK:
895 v.val = sk->sk_no_check;
896 break;
897
898 case SO_PRIORITY:
899 v.val = sk->sk_priority;
900 break;
901
902 case SO_LINGER:
903 lv = sizeof(v.ling);
904 v.ling.l_onoff = sock_flag(sk, SOCK_LINGER);
905 v.ling.l_linger = sk->sk_lingertime / HZ;
906 break;
907
908 case SO_BSDCOMPAT:
909 sock_warn_obsolete_bsdism("getsockopt");
910 break;
911
912 case SO_TIMESTAMP:
913 v.val = sock_flag(sk, SOCK_RCVTSTAMP) &&
914 !sock_flag(sk, SOCK_RCVTSTAMPNS);
915 break;
916
917 case SO_TIMESTAMPNS:
918 v.val = sock_flag(sk, SOCK_RCVTSTAMPNS);
919 break;
920
921 case SO_TIMESTAMPING:
922 v.val = 0;
923 if (sock_flag(sk, SOCK_TIMESTAMPING_TX_HARDWARE))
924 v.val |= SOF_TIMESTAMPING_TX_HARDWARE;
925 if (sock_flag(sk, SOCK_TIMESTAMPING_TX_SOFTWARE))
926 v.val |= SOF_TIMESTAMPING_TX_SOFTWARE;
927 if (sock_flag(sk, SOCK_TIMESTAMPING_RX_HARDWARE))
928 v.val |= SOF_TIMESTAMPING_RX_HARDWARE;
929 if (sock_flag(sk, SOCK_TIMESTAMPING_RX_SOFTWARE))
930 v.val |= SOF_TIMESTAMPING_RX_SOFTWARE;
931 if (sock_flag(sk, SOCK_TIMESTAMPING_SOFTWARE))
932 v.val |= SOF_TIMESTAMPING_SOFTWARE;
933 if (sock_flag(sk, SOCK_TIMESTAMPING_SYS_HARDWARE))
934 v.val |= SOF_TIMESTAMPING_SYS_HARDWARE;
935 if (sock_flag(sk, SOCK_TIMESTAMPING_RAW_HARDWARE))
936 v.val |= SOF_TIMESTAMPING_RAW_HARDWARE;
937 break;
938
939 case SO_RCVTIMEO:
940 lv = sizeof(struct timeval);
941 if (sk->sk_rcvtimeo == MAX_SCHEDULE_TIMEOUT) {
942 v.tm.tv_sec = 0;
943 v.tm.tv_usec = 0;
944 } else {
945 v.tm.tv_sec = sk->sk_rcvtimeo / HZ;
946 v.tm.tv_usec = ((sk->sk_rcvtimeo % HZ) * 1000000) / HZ;
947 }
948 break;
949
950 case SO_SNDTIMEO:
951 lv = sizeof(struct timeval);
952 if (sk->sk_sndtimeo == MAX_SCHEDULE_TIMEOUT) {
953 v.tm.tv_sec = 0;
954 v.tm.tv_usec = 0;
955 } else {
956 v.tm.tv_sec = sk->sk_sndtimeo / HZ;
957 v.tm.tv_usec = ((sk->sk_sndtimeo % HZ) * 1000000) / HZ;
958 }
959 break;
960
961 case SO_RCVLOWAT:
962 v.val = sk->sk_rcvlowat;
963 break;
964
965 case SO_SNDLOWAT:
966 v.val = 1;
967 break;
968
969 case SO_PASSCRED:
970 v.val = !!test_bit(SOCK_PASSCRED, &sock->flags);
971 break;
972
973 case SO_PEERCRED:
974 {
975 struct ucred peercred;
976 if (len > sizeof(peercred))
977 len = sizeof(peercred);
978 cred_to_ucred(sk->sk_peer_pid, sk->sk_peer_cred, &peercred);
979 if (copy_to_user(optval, &peercred, len))
980 return -EFAULT;
981 goto lenout;
982 }
983
984 case SO_PEERNAME:
985 {
986 char address[128];
987
988 if (sock->ops->getname(sock, (struct sockaddr *)address, &lv, 2))
989 return -ENOTCONN;
990 if (lv < len)
991 return -EINVAL;
992 if (copy_to_user(optval, address, len))
993 return -EFAULT;
994 goto lenout;
995 }
996
997 /* Dubious BSD thing... Probably nobody even uses it, but
998 * the UNIX standard wants it for whatever reason... -DaveM
999 */
1000 case SO_ACCEPTCONN:
1001 v.val = sk->sk_state == TCP_LISTEN;
1002 break;
1003
1004 case SO_PASSSEC:
1005 v.val = !!test_bit(SOCK_PASSSEC, &sock->flags);
1006 break;
1007
1008 case SO_PEERSEC:
1009 return security_socket_getpeersec_stream(sock, optval, optlen, len);
1010
1011 case SO_MARK:
1012 v.val = sk->sk_mark;
1013 break;
1014
1015 case SO_RXQ_OVFL:
1016 v.val = sock_flag(sk, SOCK_RXQ_OVFL);
1017 break;
1018
1019 case SO_WIFI_STATUS:
1020 v.val = sock_flag(sk, SOCK_WIFI_STATUS);
1021 break;
1022
1023 case SO_PEEK_OFF:
1024 if (!sock->ops->set_peek_off)
1025 return -EOPNOTSUPP;
1026
1027 v.val = sk->sk_peek_off;
1028 break;
1029 case SO_NOFCS:
1030 v.val = sock_flag(sk, SOCK_NOFCS);
1031 break;
1032 default:
1033 return -ENOPROTOOPT;
1034 }
1035
1036 if (len > lv)
1037 len = lv;
1038 if (copy_to_user(optval, &v, len))
1039 return -EFAULT;
1040lenout:
1041 if (put_user(len, optlen))
1042 return -EFAULT;
1043 return 0;
1044}
1045
1046/*
1047 * Initialize an sk_lock.
1048 *
1049 * (We also register the sk_lock with the lock validator.)
1050 */
1051static inline void sock_lock_init(struct sock *sk)
1052{
1053 sock_lock_init_class_and_name(sk,
1054 af_family_slock_key_strings[sk->sk_family],
1055 af_family_slock_keys + sk->sk_family,
1056 af_family_key_strings[sk->sk_family],
1057 af_family_keys + sk->sk_family);
1058}
1059
1060/*
1061 * Copy all fields from osk to nsk but nsk->sk_refcnt must not change yet,
1062 * even temporarly, because of RCU lookups. sk_node should also be left as is.
1063 * We must not copy fields between sk_dontcopy_begin and sk_dontcopy_end
1064 */
1065static void sock_copy(struct sock *nsk, const struct sock *osk)
1066{
1067#ifdef CONFIG_SECURITY_NETWORK
1068 void *sptr = nsk->sk_security;
1069#endif
1070 memcpy(nsk, osk, offsetof(struct sock, sk_dontcopy_begin));
1071
1072 memcpy(&nsk->sk_dontcopy_end, &osk->sk_dontcopy_end,
1073 osk->sk_prot->obj_size - offsetof(struct sock, sk_dontcopy_end));
1074
1075#ifdef CONFIG_SECURITY_NETWORK
1076 nsk->sk_security = sptr;
1077 security_sk_clone(osk, nsk);
1078#endif
1079}
1080
1081/*
1082 * caches using SLAB_DESTROY_BY_RCU should let .next pointer from nulls nodes
1083 * un-modified. Special care is taken when initializing object to zero.
1084 */
1085static inline void sk_prot_clear_nulls(struct sock *sk, int size)
1086{
1087 if (offsetof(struct sock, sk_node.next) != 0)
1088 memset(sk, 0, offsetof(struct sock, sk_node.next));
1089 memset(&sk->sk_node.pprev, 0,
1090 size - offsetof(struct sock, sk_node.pprev));
1091}
1092
1093void sk_prot_clear_portaddr_nulls(struct sock *sk, int size)
1094{
1095 unsigned long nulls1, nulls2;
1096
1097 nulls1 = offsetof(struct sock, __sk_common.skc_node.next);
1098 nulls2 = offsetof(struct sock, __sk_common.skc_portaddr_node.next);
1099 if (nulls1 > nulls2)
1100 swap(nulls1, nulls2);
1101
1102 if (nulls1 != 0)
1103 memset((char *)sk, 0, nulls1);
1104 memset((char *)sk + nulls1 + sizeof(void *), 0,
1105 nulls2 - nulls1 - sizeof(void *));
1106 memset((char *)sk + nulls2 + sizeof(void *), 0,
1107 size - nulls2 - sizeof(void *));
1108}
1109EXPORT_SYMBOL(sk_prot_clear_portaddr_nulls);
1110
1111static struct sock *sk_prot_alloc(struct proto *prot, gfp_t priority,
1112 int family)
1113{
1114 struct sock *sk;
1115 struct kmem_cache *slab;
1116
1117 slab = prot->slab;
1118 if (slab != NULL) {
1119 sk = kmem_cache_alloc(slab, priority & ~__GFP_ZERO);
1120 if (!sk)
1121 return sk;
1122 if (priority & __GFP_ZERO) {
1123 if (prot->clear_sk)
1124 prot->clear_sk(sk, prot->obj_size);
1125 else
1126 sk_prot_clear_nulls(sk, prot->obj_size);
1127 }
1128 } else
1129 sk = kmalloc(prot->obj_size, priority);
1130
1131 if (sk != NULL) {
1132 kmemcheck_annotate_bitfield(sk, flags);
1133
1134 if (security_sk_alloc(sk, family, priority))
1135 goto out_free;
1136
1137 if (!try_module_get(prot->owner))
1138 goto out_free_sec;
1139 sk_tx_queue_clear(sk);
1140 }
1141
1142 return sk;
1143
1144out_free_sec:
1145 security_sk_free(sk);
1146out_free:
1147 if (slab != NULL)
1148 kmem_cache_free(slab, sk);
1149 else
1150 kfree(sk);
1151 return NULL;
1152}
1153
1154static void sk_prot_free(struct proto *prot, struct sock *sk)
1155{
1156 struct kmem_cache *slab;
1157 struct module *owner;
1158
1159 owner = prot->owner;
1160 slab = prot->slab;
1161
1162 security_sk_free(sk);
1163 if (slab != NULL)
1164 kmem_cache_free(slab, sk);
1165 else
1166 kfree(sk);
1167 module_put(owner);
1168}
1169
1170#ifdef CONFIG_CGROUPS
1171void sock_update_classid(struct sock *sk)
1172{
1173 u32 classid;
1174
1175 rcu_read_lock(); /* doing current task, which cannot vanish. */
1176 classid = task_cls_classid(current);
1177 rcu_read_unlock();
1178 if (classid && classid != sk->sk_classid)
1179 sk->sk_classid = classid;
1180}
1181EXPORT_SYMBOL(sock_update_classid);
1182
1183void sock_update_netprioidx(struct sock *sk)
1184{
1185 if (in_interrupt())
1186 return;
1187
1188 sk->sk_cgrp_prioidx = task_netprioidx(current);
1189}
1190EXPORT_SYMBOL_GPL(sock_update_netprioidx);
1191#endif
1192
1193/**
1194 * sk_alloc - All socket objects are allocated here
1195 * @net: the applicable net namespace
1196 * @family: protocol family
1197 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
1198 * @prot: struct proto associated with this new sock instance
1199 */
1200struct sock *sk_alloc(struct net *net, int family, gfp_t priority,
1201 struct proto *prot)
1202{
1203 struct sock *sk;
1204
1205 sk = sk_prot_alloc(prot, priority | __GFP_ZERO, family);
1206 if (sk) {
1207 sk->sk_family = family;
1208 /*
1209 * See comment in struct sock definition to understand
1210 * why we need sk_prot_creator -acme
1211 */
1212 sk->sk_prot = sk->sk_prot_creator = prot;
1213 sock_lock_init(sk);
1214 sock_net_set(sk, get_net(net));
1215 atomic_set(&sk->sk_wmem_alloc, 1);
1216
1217 sock_update_classid(sk);
1218 sock_update_netprioidx(sk);
1219 }
1220
1221 return sk;
1222}
1223EXPORT_SYMBOL(sk_alloc);
1224
1225static void __sk_free(struct sock *sk)
1226{
1227 struct sk_filter *filter;
1228
1229 if (sk->sk_destruct)
1230 sk->sk_destruct(sk);
1231
1232 filter = rcu_dereference_check(sk->sk_filter,
1233 atomic_read(&sk->sk_wmem_alloc) == 0);
1234 if (filter) {
1235 sk_filter_uncharge(sk, filter);
1236 RCU_INIT_POINTER(sk->sk_filter, NULL);
1237 }
1238
1239 sock_disable_timestamp(sk, SK_FLAGS_TIMESTAMP);
1240
1241 if (atomic_read(&sk->sk_omem_alloc))
1242 pr_debug("%s: optmem leakage (%d bytes) detected\n",
1243 __func__, atomic_read(&sk->sk_omem_alloc));
1244
1245 if (sk->sk_peer_cred)
1246 put_cred(sk->sk_peer_cred);
1247 put_pid(sk->sk_peer_pid);
1248 put_net(sock_net(sk));
1249 sk_prot_free(sk->sk_prot_creator, sk);
1250}
1251
1252void sk_free(struct sock *sk)
1253{
1254 /*
1255 * We subtract one from sk_wmem_alloc and can know if
1256 * some packets are still in some tx queue.
1257 * If not null, sock_wfree() will call __sk_free(sk) later
1258 */
1259 if (atomic_dec_and_test(&sk->sk_wmem_alloc))
1260 __sk_free(sk);
1261}
1262EXPORT_SYMBOL(sk_free);
1263
1264/*
1265 * Last sock_put should drop reference to sk->sk_net. It has already
1266 * been dropped in sk_change_net. Taking reference to stopping namespace
1267 * is not an option.
1268 * Take reference to a socket to remove it from hash _alive_ and after that
1269 * destroy it in the context of init_net.
1270 */
1271void sk_release_kernel(struct sock *sk)
1272{
1273 if (sk == NULL || sk->sk_socket == NULL)
1274 return;
1275
1276 sock_hold(sk);
1277 sock_release(sk->sk_socket);
1278 release_net(sock_net(sk));
1279 sock_net_set(sk, get_net(&init_net));
1280 sock_put(sk);
1281}
1282EXPORT_SYMBOL(sk_release_kernel);
1283
1284static void sk_update_clone(const struct sock *sk, struct sock *newsk)
1285{
1286 if (mem_cgroup_sockets_enabled && sk->sk_cgrp)
1287 sock_update_memcg(newsk);
1288}
1289
1290/**
1291 * sk_clone_lock - clone a socket, and lock its clone
1292 * @sk: the socket to clone
1293 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
1294 *
1295 * Caller must unlock socket even in error path (bh_unlock_sock(newsk))
1296 */
1297struct sock *sk_clone_lock(const struct sock *sk, const gfp_t priority)
1298{
1299 struct sock *newsk;
1300
1301 newsk = sk_prot_alloc(sk->sk_prot, priority, sk->sk_family);
1302 if (newsk != NULL) {
1303 struct sk_filter *filter;
1304
1305 sock_copy(newsk, sk);
1306
1307 /* SANITY */
1308 get_net(sock_net(newsk));
1309 sk_node_init(&newsk->sk_node);
1310 sock_lock_init(newsk);
1311 bh_lock_sock(newsk);
1312 newsk->sk_backlog.head = newsk->sk_backlog.tail = NULL;
1313 newsk->sk_backlog.len = 0;
1314
1315 atomic_set(&newsk->sk_rmem_alloc, 0);
1316 /*
1317 * sk_wmem_alloc set to one (see sk_free() and sock_wfree())
1318 */
1319 atomic_set(&newsk->sk_wmem_alloc, 1);
1320 atomic_set(&newsk->sk_omem_alloc, 0);
1321 skb_queue_head_init(&newsk->sk_receive_queue);
1322 skb_queue_head_init(&newsk->sk_write_queue);
1323#ifdef CONFIG_NET_DMA
1324 skb_queue_head_init(&newsk->sk_async_wait_queue);
1325#endif
1326
1327 spin_lock_init(&newsk->sk_dst_lock);
1328 rwlock_init(&newsk->sk_callback_lock);
1329 lockdep_set_class_and_name(&newsk->sk_callback_lock,
1330 af_callback_keys + newsk->sk_family,
1331 af_family_clock_key_strings[newsk->sk_family]);
1332
1333 newsk->sk_dst_cache = NULL;
1334 newsk->sk_wmem_queued = 0;
1335 newsk->sk_forward_alloc = 0;
1336 newsk->sk_send_head = NULL;
1337 newsk->sk_userlocks = sk->sk_userlocks & ~SOCK_BINDPORT_LOCK;
1338
1339 sock_reset_flag(newsk, SOCK_DONE);
1340 skb_queue_head_init(&newsk->sk_error_queue);
1341
1342 filter = rcu_dereference_protected(newsk->sk_filter, 1);
1343 if (filter != NULL)
1344 sk_filter_charge(newsk, filter);
1345
1346 if (unlikely(xfrm_sk_clone_policy(newsk))) {
1347 /* It is still raw copy of parent, so invalidate
1348 * destructor and make plain sk_free() */
1349 newsk->sk_destruct = NULL;
1350 bh_unlock_sock(newsk);
1351 sk_free(newsk);
1352 newsk = NULL;
1353 goto out;
1354 }
1355
1356 newsk->sk_err = 0;
1357 newsk->sk_priority = 0;
1358 /*
1359 * Before updating sk_refcnt, we must commit prior changes to memory
1360 * (Documentation/RCU/rculist_nulls.txt for details)
1361 */
1362 smp_wmb();
1363 atomic_set(&newsk->sk_refcnt, 2);
1364
1365 /*
1366 * Increment the counter in the same struct proto as the master
1367 * sock (sk_refcnt_debug_inc uses newsk->sk_prot->socks, that
1368 * is the same as sk->sk_prot->socks, as this field was copied
1369 * with memcpy).
1370 *
1371 * This _changes_ the previous behaviour, where
1372 * tcp_create_openreq_child always was incrementing the
1373 * equivalent to tcp_prot->socks (inet_sock_nr), so this have
1374 * to be taken into account in all callers. -acme
1375 */
1376 sk_refcnt_debug_inc(newsk);
1377 sk_set_socket(newsk, NULL);
1378 newsk->sk_wq = NULL;
1379
1380 sk_update_clone(sk, newsk);
1381
1382 if (newsk->sk_prot->sockets_allocated)
1383 sk_sockets_allocated_inc(newsk);
1384
1385 if (newsk->sk_flags & SK_FLAGS_TIMESTAMP)
1386 net_enable_timestamp();
1387 }
1388out:
1389 return newsk;
1390}
1391EXPORT_SYMBOL_GPL(sk_clone_lock);
1392
1393void sk_setup_caps(struct sock *sk, struct dst_entry *dst)
1394{
1395 __sk_dst_set(sk, dst);
1396 sk->sk_route_caps = dst->dev->features;
1397 if (sk->sk_route_caps & NETIF_F_GSO)
1398 sk->sk_route_caps |= NETIF_F_GSO_SOFTWARE;
1399 sk->sk_route_caps &= ~sk->sk_route_nocaps;
1400 if (sk_can_gso(sk)) {
1401 if (dst->header_len) {
1402 sk->sk_route_caps &= ~NETIF_F_GSO_MASK;
1403 } else {
1404 sk->sk_route_caps |= NETIF_F_SG | NETIF_F_HW_CSUM;
1405 sk->sk_gso_max_size = dst->dev->gso_max_size;
1406 sk->sk_gso_max_segs = dst->dev->gso_max_segs;
1407 }
1408 }
1409}
1410EXPORT_SYMBOL_GPL(sk_setup_caps);
1411
1412void __init sk_init(void)
1413{
1414 if (totalram_pages <= 4096) {
1415 sysctl_wmem_max = 32767;
1416 sysctl_rmem_max = 32767;
1417 sysctl_wmem_default = 32767;
1418 sysctl_rmem_default = 32767;
1419 } else if (totalram_pages >= 131072) {
1420 sysctl_wmem_max = 131071;
1421 sysctl_rmem_max = 131071;
1422 }
1423}
1424
1425/*
1426 * Simple resource managers for sockets.
1427 */
1428
1429
1430/*
1431 * Write buffer destructor automatically called from kfree_skb.
1432 */
1433void sock_wfree(struct sk_buff *skb)
1434{
1435 struct sock *sk = skb->sk;
1436 unsigned int len = skb->truesize;
1437
1438 if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE)) {
1439 /*
1440 * Keep a reference on sk_wmem_alloc, this will be released
1441 * after sk_write_space() call
1442 */
1443 atomic_sub(len - 1, &sk->sk_wmem_alloc);
1444 sk->sk_write_space(sk);
1445 len = 1;
1446 }
1447 /*
1448 * if sk_wmem_alloc reaches 0, we must finish what sk_free()
1449 * could not do because of in-flight packets
1450 */
1451 if (atomic_sub_and_test(len, &sk->sk_wmem_alloc))
1452 __sk_free(sk);
1453}
1454EXPORT_SYMBOL(sock_wfree);
1455
1456/*
1457 * Read buffer destructor automatically called from kfree_skb.
1458 */
1459void sock_rfree(struct sk_buff *skb)
1460{
1461 struct sock *sk = skb->sk;
1462 unsigned int len = skb->truesize;
1463
1464 atomic_sub(len, &sk->sk_rmem_alloc);
1465 sk_mem_uncharge(sk, len);
1466}
1467EXPORT_SYMBOL(sock_rfree);
1468
1469
1470int sock_i_uid(struct sock *sk)
1471{
1472 int uid;
1473
1474 read_lock_bh(&sk->sk_callback_lock);
1475 uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : 0;
1476 read_unlock_bh(&sk->sk_callback_lock);
1477 return uid;
1478}
1479EXPORT_SYMBOL(sock_i_uid);
1480
1481unsigned long sock_i_ino(struct sock *sk)
1482{
1483 unsigned long ino;
1484
1485 read_lock_bh(&sk->sk_callback_lock);
1486 ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0;
1487 read_unlock_bh(&sk->sk_callback_lock);
1488 return ino;
1489}
1490EXPORT_SYMBOL(sock_i_ino);
1491
1492/*
1493 * Allocate a skb from the socket's send buffer.
1494 */
1495struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force,
1496 gfp_t priority)
1497{
1498 if (force || atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
1499 struct sk_buff *skb = alloc_skb(size, priority);
1500 if (skb) {
1501 skb_set_owner_w(skb, sk);
1502 return skb;
1503 }
1504 }
1505 return NULL;
1506}
1507EXPORT_SYMBOL(sock_wmalloc);
1508
1509/*
1510 * Allocate a skb from the socket's receive buffer.
1511 */
1512struct sk_buff *sock_rmalloc(struct sock *sk, unsigned long size, int force,
1513 gfp_t priority)
1514{
1515 if (force || atomic_read(&sk->sk_rmem_alloc) < sk->sk_rcvbuf) {
1516 struct sk_buff *skb = alloc_skb(size, priority);
1517 if (skb) {
1518 skb_set_owner_r(skb, sk);
1519 return skb;
1520 }
1521 }
1522 return NULL;
1523}
1524
1525/*
1526 * Allocate a memory block from the socket's option memory buffer.
1527 */
1528void *sock_kmalloc(struct sock *sk, int size, gfp_t priority)
1529{
1530 if ((unsigned int)size <= sysctl_optmem_max &&
1531 atomic_read(&sk->sk_omem_alloc) + size < sysctl_optmem_max) {
1532 void *mem;
1533 /* First do the add, to avoid the race if kmalloc
1534 * might sleep.
1535 */
1536 atomic_add(size, &sk->sk_omem_alloc);
1537 mem = kmalloc(size, priority);
1538 if (mem)
1539 return mem;
1540 atomic_sub(size, &sk->sk_omem_alloc);
1541 }
1542 return NULL;
1543}
1544EXPORT_SYMBOL(sock_kmalloc);
1545
1546/*
1547 * Free an option memory block.
1548 */
1549void sock_kfree_s(struct sock *sk, void *mem, int size)
1550{
1551 kfree(mem);
1552 atomic_sub(size, &sk->sk_omem_alloc);
1553}
1554EXPORT_SYMBOL(sock_kfree_s);
1555
1556/* It is almost wait_for_tcp_memory minus release_sock/lock_sock.
1557 I think, these locks should be removed for datagram sockets.
1558 */
1559static long sock_wait_for_wmem(struct sock *sk, long timeo)
1560{
1561 DEFINE_WAIT(wait);
1562
1563 clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1564 for (;;) {
1565 if (!timeo)
1566 break;
1567 if (signal_pending(current))
1568 break;
1569 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1570 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1571 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf)
1572 break;
1573 if (sk->sk_shutdown & SEND_SHUTDOWN)
1574 break;
1575 if (sk->sk_err)
1576 break;
1577 timeo = schedule_timeout(timeo);
1578 }
1579 finish_wait(sk_sleep(sk), &wait);
1580 return timeo;
1581}
1582
1583
1584/*
1585 * Generic send/receive buffer handlers
1586 */
1587
1588struct sk_buff *sock_alloc_send_pskb(struct sock *sk, unsigned long header_len,
1589 unsigned long data_len, int noblock,
1590 int *errcode)
1591{
1592 struct sk_buff *skb;
1593 gfp_t gfp_mask;
1594 long timeo;
1595 int err;
1596 int npages = (data_len + (PAGE_SIZE - 1)) >> PAGE_SHIFT;
1597
1598 err = -EMSGSIZE;
1599 if (npages > MAX_SKB_FRAGS)
1600 goto failure;
1601
1602 gfp_mask = sk->sk_allocation;
1603 if (gfp_mask & __GFP_WAIT)
1604 gfp_mask |= __GFP_REPEAT;
1605
1606 timeo = sock_sndtimeo(sk, noblock);
1607 while (1) {
1608 err = sock_error(sk);
1609 if (err != 0)
1610 goto failure;
1611
1612 err = -EPIPE;
1613 if (sk->sk_shutdown & SEND_SHUTDOWN)
1614 goto failure;
1615
1616 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
1617 skb = alloc_skb(header_len, gfp_mask);
1618 if (skb) {
1619 int i;
1620
1621 /* No pages, we're done... */
1622 if (!data_len)
1623 break;
1624
1625 skb->truesize += data_len;
1626 skb_shinfo(skb)->nr_frags = npages;
1627 for (i = 0; i < npages; i++) {
1628 struct page *page;
1629
1630 page = alloc_pages(sk->sk_allocation, 0);
1631 if (!page) {
1632 err = -ENOBUFS;
1633 skb_shinfo(skb)->nr_frags = i;
1634 kfree_skb(skb);
1635 goto failure;
1636 }
1637
1638 __skb_fill_page_desc(skb, i,
1639 page, 0,
1640 (data_len >= PAGE_SIZE ?
1641 PAGE_SIZE :
1642 data_len));
1643 data_len -= PAGE_SIZE;
1644 }
1645
1646 /* Full success... */
1647 break;
1648 }
1649 err = -ENOBUFS;
1650 goto failure;
1651 }
1652 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1653 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1654 err = -EAGAIN;
1655 if (!timeo)
1656 goto failure;
1657 if (signal_pending(current))
1658 goto interrupted;
1659 timeo = sock_wait_for_wmem(sk, timeo);
1660 }
1661
1662 skb_set_owner_w(skb, sk);
1663 return skb;
1664
1665interrupted:
1666 err = sock_intr_errno(timeo);
1667failure:
1668 *errcode = err;
1669 return NULL;
1670}
1671EXPORT_SYMBOL(sock_alloc_send_pskb);
1672
1673struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size,
1674 int noblock, int *errcode)
1675{
1676 return sock_alloc_send_pskb(sk, size, 0, noblock, errcode);
1677}
1678EXPORT_SYMBOL(sock_alloc_send_skb);
1679
1680static void __lock_sock(struct sock *sk)
1681 __releases(&sk->sk_lock.slock)
1682 __acquires(&sk->sk_lock.slock)
1683{
1684 DEFINE_WAIT(wait);
1685
1686 for (;;) {
1687 prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait,
1688 TASK_UNINTERRUPTIBLE);
1689 spin_unlock_bh(&sk->sk_lock.slock);
1690 schedule();
1691 spin_lock_bh(&sk->sk_lock.slock);
1692 if (!sock_owned_by_user(sk))
1693 break;
1694 }
1695 finish_wait(&sk->sk_lock.wq, &wait);
1696}
1697
1698static void __release_sock(struct sock *sk)
1699 __releases(&sk->sk_lock.slock)
1700 __acquires(&sk->sk_lock.slock)
1701{
1702 struct sk_buff *skb = sk->sk_backlog.head;
1703
1704 do {
1705 sk->sk_backlog.head = sk->sk_backlog.tail = NULL;
1706 bh_unlock_sock(sk);
1707
1708 do {
1709 struct sk_buff *next = skb->next;
1710
1711 prefetch(next);
1712 WARN_ON_ONCE(skb_dst_is_noref(skb));
1713 skb->next = NULL;
1714 sk_backlog_rcv(sk, skb);
1715
1716 /*
1717 * We are in process context here with softirqs
1718 * disabled, use cond_resched_softirq() to preempt.
1719 * This is safe to do because we've taken the backlog
1720 * queue private:
1721 */
1722 cond_resched_softirq();
1723
1724 skb = next;
1725 } while (skb != NULL);
1726
1727 bh_lock_sock(sk);
1728 } while ((skb = sk->sk_backlog.head) != NULL);
1729
1730 /*
1731 * Doing the zeroing here guarantee we can not loop forever
1732 * while a wild producer attempts to flood us.
1733 */
1734 sk->sk_backlog.len = 0;
1735}
1736
1737/**
1738 * sk_wait_data - wait for data to arrive at sk_receive_queue
1739 * @sk: sock to wait on
1740 * @timeo: for how long
1741 *
1742 * Now socket state including sk->sk_err is changed only under lock,
1743 * hence we may omit checks after joining wait queue.
1744 * We check receive queue before schedule() only as optimization;
1745 * it is very likely that release_sock() added new data.
1746 */
1747int sk_wait_data(struct sock *sk, long *timeo)
1748{
1749 int rc;
1750 DEFINE_WAIT(wait);
1751
1752 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1753 set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
1754 rc = sk_wait_event(sk, timeo, !skb_queue_empty(&sk->sk_receive_queue));
1755 clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
1756 finish_wait(sk_sleep(sk), &wait);
1757 return rc;
1758}
1759EXPORT_SYMBOL(sk_wait_data);
1760
1761/**
1762 * __sk_mem_schedule - increase sk_forward_alloc and memory_allocated
1763 * @sk: socket
1764 * @size: memory size to allocate
1765 * @kind: allocation type
1766 *
1767 * If kind is SK_MEM_SEND, it means wmem allocation. Otherwise it means
1768 * rmem allocation. This function assumes that protocols which have
1769 * memory_pressure use sk_wmem_queued as write buffer accounting.
1770 */
1771int __sk_mem_schedule(struct sock *sk, int size, int kind)
1772{
1773 struct proto *prot = sk->sk_prot;
1774 int amt = sk_mem_pages(size);
1775 long allocated;
1776 int parent_status = UNDER_LIMIT;
1777
1778 sk->sk_forward_alloc += amt * SK_MEM_QUANTUM;
1779
1780 allocated = sk_memory_allocated_add(sk, amt, &parent_status);
1781
1782 /* Under limit. */
1783 if (parent_status == UNDER_LIMIT &&
1784 allocated <= sk_prot_mem_limits(sk, 0)) {
1785 sk_leave_memory_pressure(sk);
1786 return 1;
1787 }
1788
1789 /* Under pressure. (we or our parents) */
1790 if ((parent_status > SOFT_LIMIT) ||
1791 allocated > sk_prot_mem_limits(sk, 1))
1792 sk_enter_memory_pressure(sk);
1793
1794 /* Over hard limit (we or our parents) */
1795 if ((parent_status == OVER_LIMIT) ||
1796 (allocated > sk_prot_mem_limits(sk, 2)))
1797 goto suppress_allocation;
1798
1799 /* guarantee minimum buffer size under pressure */
1800 if (kind == SK_MEM_RECV) {
1801 if (atomic_read(&sk->sk_rmem_alloc) < prot->sysctl_rmem[0])
1802 return 1;
1803
1804 } else { /* SK_MEM_SEND */
1805 if (sk->sk_type == SOCK_STREAM) {
1806 if (sk->sk_wmem_queued < prot->sysctl_wmem[0])
1807 return 1;
1808 } else if (atomic_read(&sk->sk_wmem_alloc) <
1809 prot->sysctl_wmem[0])
1810 return 1;
1811 }
1812
1813 if (sk_has_memory_pressure(sk)) {
1814 int alloc;
1815
1816 if (!sk_under_memory_pressure(sk))
1817 return 1;
1818 alloc = sk_sockets_allocated_read_positive(sk);
1819 if (sk_prot_mem_limits(sk, 2) > alloc *
1820 sk_mem_pages(sk->sk_wmem_queued +
1821 atomic_read(&sk->sk_rmem_alloc) +
1822 sk->sk_forward_alloc))
1823 return 1;
1824 }
1825
1826suppress_allocation:
1827
1828 if (kind == SK_MEM_SEND && sk->sk_type == SOCK_STREAM) {
1829 sk_stream_moderate_sndbuf(sk);
1830
1831 /* Fail only if socket is _under_ its sndbuf.
1832 * In this case we cannot block, so that we have to fail.
1833 */
1834 if (sk->sk_wmem_queued + size >= sk->sk_sndbuf)
1835 return 1;
1836 }
1837
1838 trace_sock_exceed_buf_limit(sk, prot, allocated);
1839
1840 /* Alas. Undo changes. */
1841 sk->sk_forward_alloc -= amt * SK_MEM_QUANTUM;
1842
1843 sk_memory_allocated_sub(sk, amt);
1844
1845 return 0;
1846}
1847EXPORT_SYMBOL(__sk_mem_schedule);
1848
1849/**
1850 * __sk_reclaim - reclaim memory_allocated
1851 * @sk: socket
1852 */
1853void __sk_mem_reclaim(struct sock *sk)
1854{
1855 sk_memory_allocated_sub(sk,
1856 sk->sk_forward_alloc >> SK_MEM_QUANTUM_SHIFT);
1857 sk->sk_forward_alloc &= SK_MEM_QUANTUM - 1;
1858
1859 if (sk_under_memory_pressure(sk) &&
1860 (sk_memory_allocated(sk) < sk_prot_mem_limits(sk, 0)))
1861 sk_leave_memory_pressure(sk);
1862}
1863EXPORT_SYMBOL(__sk_mem_reclaim);
1864
1865
1866/*
1867 * Set of default routines for initialising struct proto_ops when
1868 * the protocol does not support a particular function. In certain
1869 * cases where it makes no sense for a protocol to have a "do nothing"
1870 * function, some default processing is provided.
1871 */
1872
1873int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len)
1874{
1875 return -EOPNOTSUPP;
1876}
1877EXPORT_SYMBOL(sock_no_bind);
1878
1879int sock_no_connect(struct socket *sock, struct sockaddr *saddr,
1880 int len, int flags)
1881{
1882 return -EOPNOTSUPP;
1883}
1884EXPORT_SYMBOL(sock_no_connect);
1885
1886int sock_no_socketpair(struct socket *sock1, struct socket *sock2)
1887{
1888 return -EOPNOTSUPP;
1889}
1890EXPORT_SYMBOL(sock_no_socketpair);
1891
1892int sock_no_accept(struct socket *sock, struct socket *newsock, int flags)
1893{
1894 return -EOPNOTSUPP;
1895}
1896EXPORT_SYMBOL(sock_no_accept);
1897
1898int sock_no_getname(struct socket *sock, struct sockaddr *saddr,
1899 int *len, int peer)
1900{
1901 return -EOPNOTSUPP;
1902}
1903EXPORT_SYMBOL(sock_no_getname);
1904
1905unsigned int sock_no_poll(struct file *file, struct socket *sock, poll_table *pt)
1906{
1907 return 0;
1908}
1909EXPORT_SYMBOL(sock_no_poll);
1910
1911int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1912{
1913 return -EOPNOTSUPP;
1914}
1915EXPORT_SYMBOL(sock_no_ioctl);
1916
1917int sock_no_listen(struct socket *sock, int backlog)
1918{
1919 return -EOPNOTSUPP;
1920}
1921EXPORT_SYMBOL(sock_no_listen);
1922
1923int sock_no_shutdown(struct socket *sock, int how)
1924{
1925 return -EOPNOTSUPP;
1926}
1927EXPORT_SYMBOL(sock_no_shutdown);
1928
1929int sock_no_setsockopt(struct socket *sock, int level, int optname,
1930 char __user *optval, unsigned int optlen)
1931{
1932 return -EOPNOTSUPP;
1933}
1934EXPORT_SYMBOL(sock_no_setsockopt);
1935
1936int sock_no_getsockopt(struct socket *sock, int level, int optname,
1937 char __user *optval, int __user *optlen)
1938{
1939 return -EOPNOTSUPP;
1940}
1941EXPORT_SYMBOL(sock_no_getsockopt);
1942
1943int sock_no_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
1944 size_t len)
1945{
1946 return -EOPNOTSUPP;
1947}
1948EXPORT_SYMBOL(sock_no_sendmsg);
1949
1950int sock_no_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
1951 size_t len, int flags)
1952{
1953 return -EOPNOTSUPP;
1954}
1955EXPORT_SYMBOL(sock_no_recvmsg);
1956
1957int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma)
1958{
1959 /* Mirror missing mmap method error code */
1960 return -ENODEV;
1961}
1962EXPORT_SYMBOL(sock_no_mmap);
1963
1964ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags)
1965{
1966 ssize_t res;
1967 struct msghdr msg = {.msg_flags = flags};
1968 struct kvec iov;
1969 char *kaddr = kmap(page);
1970 iov.iov_base = kaddr + offset;
1971 iov.iov_len = size;
1972 res = kernel_sendmsg(sock, &msg, &iov, 1, size);
1973 kunmap(page);
1974 return res;
1975}
1976EXPORT_SYMBOL(sock_no_sendpage);
1977
1978/*
1979 * Default Socket Callbacks
1980 */
1981
1982static void sock_def_wakeup(struct sock *sk)
1983{
1984 struct socket_wq *wq;
1985
1986 rcu_read_lock();
1987 wq = rcu_dereference(sk->sk_wq);
1988 if (wq_has_sleeper(wq))
1989 wake_up_interruptible_all(&wq->wait);
1990 rcu_read_unlock();
1991}
1992
1993static void sock_def_error_report(struct sock *sk)
1994{
1995 struct socket_wq *wq;
1996
1997 rcu_read_lock();
1998 wq = rcu_dereference(sk->sk_wq);
1999 if (wq_has_sleeper(wq))
2000 wake_up_interruptible_poll(&wq->wait, POLLERR);
2001 sk_wake_async(sk, SOCK_WAKE_IO, POLL_ERR);
2002 rcu_read_unlock();
2003}
2004
2005static void sock_def_readable(struct sock *sk, int len)
2006{
2007 struct socket_wq *wq;
2008
2009 rcu_read_lock();
2010 wq = rcu_dereference(sk->sk_wq);
2011 if (wq_has_sleeper(wq))
2012 wake_up_interruptible_sync_poll(&wq->wait, POLLIN | POLLPRI |
2013 POLLRDNORM | POLLRDBAND);
2014 sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN);
2015 rcu_read_unlock();
2016}
2017
2018static void sock_def_write_space(struct sock *sk)
2019{
2020 struct socket_wq *wq;
2021
2022 rcu_read_lock();
2023
2024 /* Do not wake up a writer until he can make "significant"
2025 * progress. --DaveM
2026 */
2027 if ((atomic_read(&sk->sk_wmem_alloc) << 1) <= sk->sk_sndbuf) {
2028 wq = rcu_dereference(sk->sk_wq);
2029 if (wq_has_sleeper(wq))
2030 wake_up_interruptible_sync_poll(&wq->wait, POLLOUT |
2031 POLLWRNORM | POLLWRBAND);
2032
2033 /* Should agree with poll, otherwise some programs break */
2034 if (sock_writeable(sk))
2035 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
2036 }
2037
2038 rcu_read_unlock();
2039}
2040
2041static void sock_def_destruct(struct sock *sk)
2042{
2043 kfree(sk->sk_protinfo);
2044}
2045
2046void sk_send_sigurg(struct sock *sk)
2047{
2048 if (sk->sk_socket && sk->sk_socket->file)
2049 if (send_sigurg(&sk->sk_socket->file->f_owner))
2050 sk_wake_async(sk, SOCK_WAKE_URG, POLL_PRI);
2051}
2052EXPORT_SYMBOL(sk_send_sigurg);
2053
2054void sk_reset_timer(struct sock *sk, struct timer_list* timer,
2055 unsigned long expires)
2056{
2057 if (!mod_timer(timer, expires))
2058 sock_hold(sk);
2059}
2060EXPORT_SYMBOL(sk_reset_timer);
2061
2062void sk_stop_timer(struct sock *sk, struct timer_list* timer)
2063{
2064 if (timer_pending(timer) && del_timer(timer))
2065 __sock_put(sk);
2066}
2067EXPORT_SYMBOL(sk_stop_timer);
2068
2069void sock_init_data(struct socket *sock, struct sock *sk)
2070{
2071 skb_queue_head_init(&sk->sk_receive_queue);
2072 skb_queue_head_init(&sk->sk_write_queue);
2073 skb_queue_head_init(&sk->sk_error_queue);
2074#ifdef CONFIG_NET_DMA
2075 skb_queue_head_init(&sk->sk_async_wait_queue);
2076#endif
2077
2078 sk->sk_send_head = NULL;
2079
2080 init_timer(&sk->sk_timer);
2081
2082 sk->sk_allocation = GFP_KERNEL;
2083 sk->sk_rcvbuf = sysctl_rmem_default;
2084 sk->sk_sndbuf = sysctl_wmem_default;
2085 sk->sk_state = TCP_CLOSE;
2086 sk_set_socket(sk, sock);
2087
2088 sock_set_flag(sk, SOCK_ZAPPED);
2089
2090 if (sock) {
2091 sk->sk_type = sock->type;
2092 sk->sk_wq = sock->wq;
2093 sock->sk = sk;
2094 } else
2095 sk->sk_wq = NULL;
2096
2097 spin_lock_init(&sk->sk_dst_lock);
2098 rwlock_init(&sk->sk_callback_lock);
2099 lockdep_set_class_and_name(&sk->sk_callback_lock,
2100 af_callback_keys + sk->sk_family,
2101 af_family_clock_key_strings[sk->sk_family]);
2102
2103 sk->sk_state_change = sock_def_wakeup;
2104 sk->sk_data_ready = sock_def_readable;
2105 sk->sk_write_space = sock_def_write_space;
2106 sk->sk_error_report = sock_def_error_report;
2107 sk->sk_destruct = sock_def_destruct;
2108
2109 sk->sk_sndmsg_page = NULL;
2110 sk->sk_sndmsg_off = 0;
2111 sk->sk_peek_off = -1;
2112
2113 sk->sk_peer_pid = NULL;
2114 sk->sk_peer_cred = NULL;
2115 sk->sk_write_pending = 0;
2116 sk->sk_rcvlowat = 1;
2117 sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT;
2118 sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT;
2119
2120 sk->sk_stamp = ktime_set(-1L, 0);
2121
2122 /*
2123 * Before updating sk_refcnt, we must commit prior changes to memory
2124 * (Documentation/RCU/rculist_nulls.txt for details)
2125 */
2126 smp_wmb();
2127 atomic_set(&sk->sk_refcnt, 1);
2128 atomic_set(&sk->sk_drops, 0);
2129}
2130EXPORT_SYMBOL(sock_init_data);
2131
2132void lock_sock_nested(struct sock *sk, int subclass)
2133{
2134 might_sleep();
2135 spin_lock_bh(&sk->sk_lock.slock);
2136 if (sk->sk_lock.owned)
2137 __lock_sock(sk);
2138 sk->sk_lock.owned = 1;
2139 spin_unlock(&sk->sk_lock.slock);
2140 /*
2141 * The sk_lock has mutex_lock() semantics here:
2142 */
2143 mutex_acquire(&sk->sk_lock.dep_map, subclass, 0, _RET_IP_);
2144 local_bh_enable();
2145}
2146EXPORT_SYMBOL(lock_sock_nested);
2147
2148void release_sock(struct sock *sk)
2149{
2150 /*
2151 * The sk_lock has mutex_unlock() semantics:
2152 */
2153 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_);
2154
2155 spin_lock_bh(&sk->sk_lock.slock);
2156 if (sk->sk_backlog.tail)
2157 __release_sock(sk);
2158 sk->sk_lock.owned = 0;
2159 if (waitqueue_active(&sk->sk_lock.wq))
2160 wake_up(&sk->sk_lock.wq);
2161 spin_unlock_bh(&sk->sk_lock.slock);
2162}
2163EXPORT_SYMBOL(release_sock);
2164
2165/**
2166 * lock_sock_fast - fast version of lock_sock
2167 * @sk: socket
2168 *
2169 * This version should be used for very small section, where process wont block
2170 * return false if fast path is taken
2171 * sk_lock.slock locked, owned = 0, BH disabled
2172 * return true if slow path is taken
2173 * sk_lock.slock unlocked, owned = 1, BH enabled
2174 */
2175bool lock_sock_fast(struct sock *sk)
2176{
2177 might_sleep();
2178 spin_lock_bh(&sk->sk_lock.slock);
2179
2180 if (!sk->sk_lock.owned)
2181 /*
2182 * Note : We must disable BH
2183 */
2184 return false;
2185
2186 __lock_sock(sk);
2187 sk->sk_lock.owned = 1;
2188 spin_unlock(&sk->sk_lock.slock);
2189 /*
2190 * The sk_lock has mutex_lock() semantics here:
2191 */
2192 mutex_acquire(&sk->sk_lock.dep_map, 0, 0, _RET_IP_);
2193 local_bh_enable();
2194 return true;
2195}
2196EXPORT_SYMBOL(lock_sock_fast);
2197
2198int sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp)
2199{
2200 struct timeval tv;
2201 if (!sock_flag(sk, SOCK_TIMESTAMP))
2202 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
2203 tv = ktime_to_timeval(sk->sk_stamp);
2204 if (tv.tv_sec == -1)
2205 return -ENOENT;
2206 if (tv.tv_sec == 0) {
2207 sk->sk_stamp = ktime_get_real();
2208 tv = ktime_to_timeval(sk->sk_stamp);
2209 }
2210 return copy_to_user(userstamp, &tv, sizeof(tv)) ? -EFAULT : 0;
2211}
2212EXPORT_SYMBOL(sock_get_timestamp);
2213
2214int sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp)
2215{
2216 struct timespec ts;
2217 if (!sock_flag(sk, SOCK_TIMESTAMP))
2218 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
2219 ts = ktime_to_timespec(sk->sk_stamp);
2220 if (ts.tv_sec == -1)
2221 return -ENOENT;
2222 if (ts.tv_sec == 0) {
2223 sk->sk_stamp = ktime_get_real();
2224 ts = ktime_to_timespec(sk->sk_stamp);
2225 }
2226 return copy_to_user(userstamp, &ts, sizeof(ts)) ? -EFAULT : 0;
2227}
2228EXPORT_SYMBOL(sock_get_timestampns);
2229
2230void sock_enable_timestamp(struct sock *sk, int flag)
2231{
2232 if (!sock_flag(sk, flag)) {
2233 unsigned long previous_flags = sk->sk_flags;
2234
2235 sock_set_flag(sk, flag);
2236 /*
2237 * we just set one of the two flags which require net
2238 * time stamping, but time stamping might have been on
2239 * already because of the other one
2240 */
2241 if (!(previous_flags & SK_FLAGS_TIMESTAMP))
2242 net_enable_timestamp();
2243 }
2244}
2245
2246/*
2247 * Get a socket option on an socket.
2248 *
2249 * FIX: POSIX 1003.1g is very ambiguous here. It states that
2250 * asynchronous errors should be reported by getsockopt. We assume
2251 * this means if you specify SO_ERROR (otherwise whats the point of it).
2252 */
2253int sock_common_getsockopt(struct socket *sock, int level, int optname,
2254 char __user *optval, int __user *optlen)
2255{
2256 struct sock *sk = sock->sk;
2257
2258 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
2259}
2260EXPORT_SYMBOL(sock_common_getsockopt);
2261
2262#ifdef CONFIG_COMPAT
2263int compat_sock_common_getsockopt(struct socket *sock, int level, int optname,
2264 char __user *optval, int __user *optlen)
2265{
2266 struct sock *sk = sock->sk;
2267
2268 if (sk->sk_prot->compat_getsockopt != NULL)
2269 return sk->sk_prot->compat_getsockopt(sk, level, optname,
2270 optval, optlen);
2271 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
2272}
2273EXPORT_SYMBOL(compat_sock_common_getsockopt);
2274#endif
2275
2276int sock_common_recvmsg(struct kiocb *iocb, struct socket *sock,
2277 struct msghdr *msg, size_t size, int flags)
2278{
2279 struct sock *sk = sock->sk;
2280 int addr_len = 0;
2281 int err;
2282
2283 err = sk->sk_prot->recvmsg(iocb, sk, msg, size, flags & MSG_DONTWAIT,
2284 flags & ~MSG_DONTWAIT, &addr_len);
2285 if (err >= 0)
2286 msg->msg_namelen = addr_len;
2287 return err;
2288}
2289EXPORT_SYMBOL(sock_common_recvmsg);
2290
2291/*
2292 * Set socket options on an inet socket.
2293 */
2294int sock_common_setsockopt(struct socket *sock, int level, int optname,
2295 char __user *optval, unsigned int optlen)
2296{
2297 struct sock *sk = sock->sk;
2298
2299 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
2300}
2301EXPORT_SYMBOL(sock_common_setsockopt);
2302
2303#ifdef CONFIG_COMPAT
2304int compat_sock_common_setsockopt(struct socket *sock, int level, int optname,
2305 char __user *optval, unsigned int optlen)
2306{
2307 struct sock *sk = sock->sk;
2308
2309 if (sk->sk_prot->compat_setsockopt != NULL)
2310 return sk->sk_prot->compat_setsockopt(sk, level, optname,
2311 optval, optlen);
2312 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
2313}
2314EXPORT_SYMBOL(compat_sock_common_setsockopt);
2315#endif
2316
2317void sk_common_release(struct sock *sk)
2318{
2319 if (sk->sk_prot->destroy)
2320 sk->sk_prot->destroy(sk);
2321
2322 /*
2323 * Observation: when sock_common_release is called, processes have
2324 * no access to socket. But net still has.
2325 * Step one, detach it from networking:
2326 *
2327 * A. Remove from hash tables.
2328 */
2329
2330 sk->sk_prot->unhash(sk);
2331
2332 /*
2333 * In this point socket cannot receive new packets, but it is possible
2334 * that some packets are in flight because some CPU runs receiver and
2335 * did hash table lookup before we unhashed socket. They will achieve
2336 * receive queue and will be purged by socket destructor.
2337 *
2338 * Also we still have packets pending on receive queue and probably,
2339 * our own packets waiting in device queues. sock_destroy will drain
2340 * receive queue, but transmitted packets will delay socket destruction
2341 * until the last reference will be released.
2342 */
2343
2344 sock_orphan(sk);
2345
2346 xfrm_sk_free_policy(sk);
2347
2348 sk_refcnt_debug_release(sk);
2349 sock_put(sk);
2350}
2351EXPORT_SYMBOL(sk_common_release);
2352
2353#ifdef CONFIG_PROC_FS
2354#define PROTO_INUSE_NR 64 /* should be enough for the first time */
2355struct prot_inuse {
2356 int val[PROTO_INUSE_NR];
2357};
2358
2359static DECLARE_BITMAP(proto_inuse_idx, PROTO_INUSE_NR);
2360
2361#ifdef CONFIG_NET_NS
2362void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
2363{
2364 __this_cpu_add(net->core.inuse->val[prot->inuse_idx], val);
2365}
2366EXPORT_SYMBOL_GPL(sock_prot_inuse_add);
2367
2368int sock_prot_inuse_get(struct net *net, struct proto *prot)
2369{
2370 int cpu, idx = prot->inuse_idx;
2371 int res = 0;
2372
2373 for_each_possible_cpu(cpu)
2374 res += per_cpu_ptr(net->core.inuse, cpu)->val[idx];
2375
2376 return res >= 0 ? res : 0;
2377}
2378EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
2379
2380static int __net_init sock_inuse_init_net(struct net *net)
2381{
2382 net->core.inuse = alloc_percpu(struct prot_inuse);
2383 return net->core.inuse ? 0 : -ENOMEM;
2384}
2385
2386static void __net_exit sock_inuse_exit_net(struct net *net)
2387{
2388 free_percpu(net->core.inuse);
2389}
2390
2391static struct pernet_operations net_inuse_ops = {
2392 .init = sock_inuse_init_net,
2393 .exit = sock_inuse_exit_net,
2394};
2395
2396static __init int net_inuse_init(void)
2397{
2398 if (register_pernet_subsys(&net_inuse_ops))
2399 panic("Cannot initialize net inuse counters");
2400
2401 return 0;
2402}
2403
2404core_initcall(net_inuse_init);
2405#else
2406static DEFINE_PER_CPU(struct prot_inuse, prot_inuse);
2407
2408void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
2409{
2410 __this_cpu_add(prot_inuse.val[prot->inuse_idx], val);
2411}
2412EXPORT_SYMBOL_GPL(sock_prot_inuse_add);
2413
2414int sock_prot_inuse_get(struct net *net, struct proto *prot)
2415{
2416 int cpu, idx = prot->inuse_idx;
2417 int res = 0;
2418
2419 for_each_possible_cpu(cpu)
2420 res += per_cpu(prot_inuse, cpu).val[idx];
2421
2422 return res >= 0 ? res : 0;
2423}
2424EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
2425#endif
2426
2427static void assign_proto_idx(struct proto *prot)
2428{
2429 prot->inuse_idx = find_first_zero_bit(proto_inuse_idx, PROTO_INUSE_NR);
2430
2431 if (unlikely(prot->inuse_idx == PROTO_INUSE_NR - 1)) {
2432 pr_err("PROTO_INUSE_NR exhausted\n");
2433 return;
2434 }
2435
2436 set_bit(prot->inuse_idx, proto_inuse_idx);
2437}
2438
2439static void release_proto_idx(struct proto *prot)
2440{
2441 if (prot->inuse_idx != PROTO_INUSE_NR - 1)
2442 clear_bit(prot->inuse_idx, proto_inuse_idx);
2443}
2444#else
2445static inline void assign_proto_idx(struct proto *prot)
2446{
2447}
2448
2449static inline void release_proto_idx(struct proto *prot)
2450{
2451}
2452#endif
2453
2454int proto_register(struct proto *prot, int alloc_slab)
2455{
2456 if (alloc_slab) {
2457 prot->slab = kmem_cache_create(prot->name, prot->obj_size, 0,
2458 SLAB_HWCACHE_ALIGN | prot->slab_flags,
2459 NULL);
2460
2461 if (prot->slab == NULL) {
2462 pr_crit("%s: Can't create sock SLAB cache!\n",
2463 prot->name);
2464 goto out;
2465 }
2466
2467 if (prot->rsk_prot != NULL) {
2468 prot->rsk_prot->slab_name = kasprintf(GFP_KERNEL, "request_sock_%s", prot->name);
2469 if (prot->rsk_prot->slab_name == NULL)
2470 goto out_free_sock_slab;
2471
2472 prot->rsk_prot->slab = kmem_cache_create(prot->rsk_prot->slab_name,
2473 prot->rsk_prot->obj_size, 0,
2474 SLAB_HWCACHE_ALIGN, NULL);
2475
2476 if (prot->rsk_prot->slab == NULL) {
2477 pr_crit("%s: Can't create request sock SLAB cache!\n",
2478 prot->name);
2479 goto out_free_request_sock_slab_name;
2480 }
2481 }
2482
2483 if (prot->twsk_prot != NULL) {
2484 prot->twsk_prot->twsk_slab_name = kasprintf(GFP_KERNEL, "tw_sock_%s", prot->name);
2485
2486 if (prot->twsk_prot->twsk_slab_name == NULL)
2487 goto out_free_request_sock_slab;
2488
2489 prot->twsk_prot->twsk_slab =
2490 kmem_cache_create(prot->twsk_prot->twsk_slab_name,
2491 prot->twsk_prot->twsk_obj_size,
2492 0,
2493 SLAB_HWCACHE_ALIGN |
2494 prot->slab_flags,
2495 NULL);
2496 if (prot->twsk_prot->twsk_slab == NULL)
2497 goto out_free_timewait_sock_slab_name;
2498 }
2499 }
2500
2501 mutex_lock(&proto_list_mutex);
2502 list_add(&prot->node, &proto_list);
2503 assign_proto_idx(prot);
2504 mutex_unlock(&proto_list_mutex);
2505 return 0;
2506
2507out_free_timewait_sock_slab_name:
2508 kfree(prot->twsk_prot->twsk_slab_name);
2509out_free_request_sock_slab:
2510 if (prot->rsk_prot && prot->rsk_prot->slab) {
2511 kmem_cache_destroy(prot->rsk_prot->slab);
2512 prot->rsk_prot->slab = NULL;
2513 }
2514out_free_request_sock_slab_name:
2515 if (prot->rsk_prot)
2516 kfree(prot->rsk_prot->slab_name);
2517out_free_sock_slab:
2518 kmem_cache_destroy(prot->slab);
2519 prot->slab = NULL;
2520out:
2521 return -ENOBUFS;
2522}
2523EXPORT_SYMBOL(proto_register);
2524
2525void proto_unregister(struct proto *prot)
2526{
2527 mutex_lock(&proto_list_mutex);
2528 release_proto_idx(prot);
2529 list_del(&prot->node);
2530 mutex_unlock(&proto_list_mutex);
2531
2532 if (prot->slab != NULL) {
2533 kmem_cache_destroy(prot->slab);
2534 prot->slab = NULL;
2535 }
2536
2537 if (prot->rsk_prot != NULL && prot->rsk_prot->slab != NULL) {
2538 kmem_cache_destroy(prot->rsk_prot->slab);
2539 kfree(prot->rsk_prot->slab_name);
2540 prot->rsk_prot->slab = NULL;
2541 }
2542
2543 if (prot->twsk_prot != NULL && prot->twsk_prot->twsk_slab != NULL) {
2544 kmem_cache_destroy(prot->twsk_prot->twsk_slab);
2545 kfree(prot->twsk_prot->twsk_slab_name);
2546 prot->twsk_prot->twsk_slab = NULL;
2547 }
2548}
2549EXPORT_SYMBOL(proto_unregister);
2550
2551#ifdef CONFIG_PROC_FS
2552static void *proto_seq_start(struct seq_file *seq, loff_t *pos)
2553 __acquires(proto_list_mutex)
2554{
2555 mutex_lock(&proto_list_mutex);
2556 return seq_list_start_head(&proto_list, *pos);
2557}
2558
2559static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2560{
2561 return seq_list_next(v, &proto_list, pos);
2562}
2563
2564static void proto_seq_stop(struct seq_file *seq, void *v)
2565 __releases(proto_list_mutex)
2566{
2567 mutex_unlock(&proto_list_mutex);
2568}
2569
2570static char proto_method_implemented(const void *method)
2571{
2572 return method == NULL ? 'n' : 'y';
2573}
2574static long sock_prot_memory_allocated(struct proto *proto)
2575{
2576 return proto->memory_allocated != NULL ? proto_memory_allocated(proto) : -1L;
2577}
2578
2579static char *sock_prot_memory_pressure(struct proto *proto)
2580{
2581 return proto->memory_pressure != NULL ?
2582 proto_memory_pressure(proto) ? "yes" : "no" : "NI";
2583}
2584
2585static void proto_seq_printf(struct seq_file *seq, struct proto *proto)
2586{
2587
2588 seq_printf(seq, "%-9s %4u %6d %6ld %-3s %6u %-3s %-10s "
2589 "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n",
2590 proto->name,
2591 proto->obj_size,
2592 sock_prot_inuse_get(seq_file_net(seq), proto),
2593 sock_prot_memory_allocated(proto),
2594 sock_prot_memory_pressure(proto),
2595 proto->max_header,
2596 proto->slab == NULL ? "no" : "yes",
2597 module_name(proto->owner),
2598 proto_method_implemented(proto->close),
2599 proto_method_implemented(proto->connect),
2600 proto_method_implemented(proto->disconnect),
2601 proto_method_implemented(proto->accept),
2602 proto_method_implemented(proto->ioctl),
2603 proto_method_implemented(proto->init),
2604 proto_method_implemented(proto->destroy),
2605 proto_method_implemented(proto->shutdown),
2606 proto_method_implemented(proto->setsockopt),
2607 proto_method_implemented(proto->getsockopt),
2608 proto_method_implemented(proto->sendmsg),
2609 proto_method_implemented(proto->recvmsg),
2610 proto_method_implemented(proto->sendpage),
2611 proto_method_implemented(proto->bind),
2612 proto_method_implemented(proto->backlog_rcv),
2613 proto_method_implemented(proto->hash),
2614 proto_method_implemented(proto->unhash),
2615 proto_method_implemented(proto->get_port),
2616 proto_method_implemented(proto->enter_memory_pressure));
2617}
2618
2619static int proto_seq_show(struct seq_file *seq, void *v)
2620{
2621 if (v == &proto_list)
2622 seq_printf(seq, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s",
2623 "protocol",
2624 "size",
2625 "sockets",
2626 "memory",
2627 "press",
2628 "maxhdr",
2629 "slab",
2630 "module",
2631 "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n");
2632 else
2633 proto_seq_printf(seq, list_entry(v, struct proto, node));
2634 return 0;
2635}
2636
2637static const struct seq_operations proto_seq_ops = {
2638 .start = proto_seq_start,
2639 .next = proto_seq_next,
2640 .stop = proto_seq_stop,
2641 .show = proto_seq_show,
2642};
2643
2644static int proto_seq_open(struct inode *inode, struct file *file)
2645{
2646 return seq_open_net(inode, file, &proto_seq_ops,
2647 sizeof(struct seq_net_private));
2648}
2649
2650static const struct file_operations proto_seq_fops = {
2651 .owner = THIS_MODULE,
2652 .open = proto_seq_open,
2653 .read = seq_read,
2654 .llseek = seq_lseek,
2655 .release = seq_release_net,
2656};
2657
2658static __net_init int proto_init_net(struct net *net)
2659{
2660 if (!proc_net_fops_create(net, "protocols", S_IRUGO, &proto_seq_fops))
2661 return -ENOMEM;
2662
2663 return 0;
2664}
2665
2666static __net_exit void proto_exit_net(struct net *net)
2667{
2668 proc_net_remove(net, "protocols");
2669}
2670
2671
2672static __net_initdata struct pernet_operations proto_net_ops = {
2673 .init = proto_init_net,
2674 .exit = proto_exit_net,
2675};
2676
2677static int __init proto_init(void)
2678{
2679 return register_pernet_subsys(&proto_net_ops);
2680}
2681
2682subsys_initcall(proto_init);
2683
2684#endif /* PROC_FS */