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1/*
2 * INET An implementation of the TCP/IP protocol suite for the LINUX
3 * operating system. INET is implemented using the BSD Socket
4 * interface as the means of communication with the user level.
5 *
6 * Generic socket support routines. Memory allocators, socket lock/release
7 * handler for protocols to use and generic option handler.
8 *
9 *
10 * Authors: Ross Biro
11 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
12 * Florian La Roche, <flla@stud.uni-sb.de>
13 * Alan Cox, <A.Cox@swansea.ac.uk>
14 *
15 * Fixes:
16 * Alan Cox : Numerous verify_area() problems
17 * Alan Cox : Connecting on a connecting socket
18 * now returns an error for tcp.
19 * Alan Cox : sock->protocol is set correctly.
20 * and is not sometimes left as 0.
21 * Alan Cox : connect handles icmp errors on a
22 * connect properly. Unfortunately there
23 * is a restart syscall nasty there. I
24 * can't match BSD without hacking the C
25 * library. Ideas urgently sought!
26 * Alan Cox : Disallow bind() to addresses that are
27 * not ours - especially broadcast ones!!
28 * Alan Cox : Socket 1024 _IS_ ok for users. (fencepost)
29 * Alan Cox : sock_wfree/sock_rfree don't destroy sockets,
30 * instead they leave that for the DESTROY timer.
31 * Alan Cox : Clean up error flag in accept
32 * Alan Cox : TCP ack handling is buggy, the DESTROY timer
33 * was buggy. Put a remove_sock() in the handler
34 * for memory when we hit 0. Also altered the timer
35 * code. The ACK stuff can wait and needs major
36 * TCP layer surgery.
37 * Alan Cox : Fixed TCP ack bug, removed remove sock
38 * and fixed timer/inet_bh race.
39 * Alan Cox : Added zapped flag for TCP
40 * Alan Cox : Move kfree_skb into skbuff.c and tidied up surplus code
41 * Alan Cox : for new sk_buff allocations wmalloc/rmalloc now call alloc_skb
42 * Alan Cox : kfree_s calls now are kfree_skbmem so we can track skb resources
43 * Alan Cox : Supports socket option broadcast now as does udp. Packet and raw need fixing.
44 * Alan Cox : Added RCVBUF,SNDBUF size setting. It suddenly occurred to me how easy it was so...
45 * Rick Sladkey : Relaxed UDP rules for matching packets.
46 * C.E.Hawkins : IFF_PROMISC/SIOCGHWADDR support
47 * Pauline Middelink : identd support
48 * Alan Cox : Fixed connect() taking signals I think.
49 * Alan Cox : SO_LINGER supported
50 * Alan Cox : Error reporting fixes
51 * Anonymous : inet_create tidied up (sk->reuse setting)
52 * Alan Cox : inet sockets don't set sk->type!
53 * Alan Cox : Split socket option code
54 * Alan Cox : Callbacks
55 * Alan Cox : Nagle flag for Charles & Johannes stuff
56 * Alex : Removed restriction on inet fioctl
57 * Alan Cox : Splitting INET from NET core
58 * Alan Cox : Fixed bogus SO_TYPE handling in getsockopt()
59 * Adam Caldwell : Missing return in SO_DONTROUTE/SO_DEBUG code
60 * Alan Cox : Split IP from generic code
61 * Alan Cox : New kfree_skbmem()
62 * Alan Cox : Make SO_DEBUG superuser only.
63 * Alan Cox : Allow anyone to clear SO_DEBUG
64 * (compatibility fix)
65 * Alan Cox : Added optimistic memory grabbing for AF_UNIX throughput.
66 * Alan Cox : Allocator for a socket is settable.
67 * Alan Cox : SO_ERROR includes soft errors.
68 * Alan Cox : Allow NULL arguments on some SO_ opts
69 * Alan Cox : Generic socket allocation to make hooks
70 * easier (suggested by Craig Metz).
71 * Michael Pall : SO_ERROR returns positive errno again
72 * Steve Whitehouse: Added default destructor to free
73 * protocol private data.
74 * Steve Whitehouse: Added various other default routines
75 * common to several socket families.
76 * Chris Evans : Call suser() check last on F_SETOWN
77 * Jay Schulist : Added SO_ATTACH_FILTER and SO_DETACH_FILTER.
78 * Andi Kleen : Add sock_kmalloc()/sock_kfree_s()
79 * Andi Kleen : Fix write_space callback
80 * Chris Evans : Security fixes - signedness again
81 * Arnaldo C. Melo : cleanups, use skb_queue_purge
82 *
83 * To Fix:
84 *
85 *
86 * This program is free software; you can redistribute it and/or
87 * modify it under the terms of the GNU General Public License
88 * as published by the Free Software Foundation; either version
89 * 2 of the License, or (at your option) any later version.
90 */
91
92#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
93
94#include <linux/capability.h>
95#include <linux/errno.h>
96#include <linux/errqueue.h>
97#include <linux/types.h>
98#include <linux/socket.h>
99#include <linux/in.h>
100#include <linux/kernel.h>
101#include <linux/module.h>
102#include <linux/proc_fs.h>
103#include <linux/seq_file.h>
104#include <linux/sched.h>
105#include <linux/sched/mm.h>
106#include <linux/timer.h>
107#include <linux/string.h>
108#include <linux/sockios.h>
109#include <linux/net.h>
110#include <linux/mm.h>
111#include <linux/slab.h>
112#include <linux/interrupt.h>
113#include <linux/poll.h>
114#include <linux/tcp.h>
115#include <linux/init.h>
116#include <linux/highmem.h>
117#include <linux/user_namespace.h>
118#include <linux/static_key.h>
119#include <linux/memcontrol.h>
120#include <linux/prefetch.h>
121
122#include <linux/uaccess.h>
123
124#include <linux/netdevice.h>
125#include <net/protocol.h>
126#include <linux/skbuff.h>
127#include <net/net_namespace.h>
128#include <net/request_sock.h>
129#include <net/sock.h>
130#include <linux/net_tstamp.h>
131#include <net/xfrm.h>
132#include <linux/ipsec.h>
133#include <net/cls_cgroup.h>
134#include <net/netprio_cgroup.h>
135#include <linux/sock_diag.h>
136
137#include <linux/filter.h>
138#include <net/sock_reuseport.h>
139
140#include <trace/events/sock.h>
141
142#include <net/tcp.h>
143#include <net/busy_poll.h>
144
145static DEFINE_MUTEX(proto_list_mutex);
146static LIST_HEAD(proto_list);
147
148static void sock_inuse_add(struct net *net, int val);
149
150/**
151 * sk_ns_capable - General socket capability test
152 * @sk: Socket to use a capability on or through
153 * @user_ns: The user namespace of the capability to use
154 * @cap: The capability to use
155 *
156 * Test to see if the opener of the socket had when the socket was
157 * created and the current process has the capability @cap in the user
158 * namespace @user_ns.
159 */
160bool sk_ns_capable(const struct sock *sk,
161 struct user_namespace *user_ns, int cap)
162{
163 return file_ns_capable(sk->sk_socket->file, user_ns, cap) &&
164 ns_capable(user_ns, cap);
165}
166EXPORT_SYMBOL(sk_ns_capable);
167
168/**
169 * sk_capable - Socket global capability test
170 * @sk: Socket to use a capability on or through
171 * @cap: The global capability to use
172 *
173 * Test to see if the opener of the socket had when the socket was
174 * created and the current process has the capability @cap in all user
175 * namespaces.
176 */
177bool sk_capable(const struct sock *sk, int cap)
178{
179 return sk_ns_capable(sk, &init_user_ns, cap);
180}
181EXPORT_SYMBOL(sk_capable);
182
183/**
184 * sk_net_capable - Network namespace socket capability test
185 * @sk: Socket to use a capability on or through
186 * @cap: The capability to use
187 *
188 * Test to see if the opener of the socket had when the socket was created
189 * and the current process has the capability @cap over the network namespace
190 * the socket is a member of.
191 */
192bool sk_net_capable(const struct sock *sk, int cap)
193{
194 return sk_ns_capable(sk, sock_net(sk)->user_ns, cap);
195}
196EXPORT_SYMBOL(sk_net_capable);
197
198/*
199 * Each address family might have different locking rules, so we have
200 * one slock key per address family and separate keys for internal and
201 * userspace sockets.
202 */
203static struct lock_class_key af_family_keys[AF_MAX];
204static struct lock_class_key af_family_kern_keys[AF_MAX];
205static struct lock_class_key af_family_slock_keys[AF_MAX];
206static struct lock_class_key af_family_kern_slock_keys[AF_MAX];
207
208/*
209 * Make lock validator output more readable. (we pre-construct these
210 * strings build-time, so that runtime initialization of socket
211 * locks is fast):
212 */
213
214#define _sock_locks(x) \
215 x "AF_UNSPEC", x "AF_UNIX" , x "AF_INET" , \
216 x "AF_AX25" , x "AF_IPX" , x "AF_APPLETALK", \
217 x "AF_NETROM", x "AF_BRIDGE" , x "AF_ATMPVC" , \
218 x "AF_X25" , x "AF_INET6" , x "AF_ROSE" , \
219 x "AF_DECnet", x "AF_NETBEUI" , x "AF_SECURITY" , \
220 x "AF_KEY" , x "AF_NETLINK" , x "AF_PACKET" , \
221 x "AF_ASH" , x "AF_ECONET" , x "AF_ATMSVC" , \
222 x "AF_RDS" , x "AF_SNA" , x "AF_IRDA" , \
223 x "AF_PPPOX" , x "AF_WANPIPE" , x "AF_LLC" , \
224 x "27" , x "28" , x "AF_CAN" , \
225 x "AF_TIPC" , x "AF_BLUETOOTH", x "IUCV" , \
226 x "AF_RXRPC" , x "AF_ISDN" , x "AF_PHONET" , \
227 x "AF_IEEE802154", x "AF_CAIF" , x "AF_ALG" , \
228 x "AF_NFC" , x "AF_VSOCK" , x "AF_KCM" , \
229 x "AF_QIPCRTR", x "AF_SMC" , x "AF_MAX"
230
231static const char *const af_family_key_strings[AF_MAX+1] = {
232 _sock_locks("sk_lock-")
233};
234static const char *const af_family_slock_key_strings[AF_MAX+1] = {
235 _sock_locks("slock-")
236};
237static const char *const af_family_clock_key_strings[AF_MAX+1] = {
238 _sock_locks("clock-")
239};
240
241static const char *const af_family_kern_key_strings[AF_MAX+1] = {
242 _sock_locks("k-sk_lock-")
243};
244static const char *const af_family_kern_slock_key_strings[AF_MAX+1] = {
245 _sock_locks("k-slock-")
246};
247static const char *const af_family_kern_clock_key_strings[AF_MAX+1] = {
248 _sock_locks("k-clock-")
249};
250static const char *const af_family_rlock_key_strings[AF_MAX+1] = {
251 "rlock-AF_UNSPEC", "rlock-AF_UNIX" , "rlock-AF_INET" ,
252 "rlock-AF_AX25" , "rlock-AF_IPX" , "rlock-AF_APPLETALK",
253 "rlock-AF_NETROM", "rlock-AF_BRIDGE" , "rlock-AF_ATMPVC" ,
254 "rlock-AF_X25" , "rlock-AF_INET6" , "rlock-AF_ROSE" ,
255 "rlock-AF_DECnet", "rlock-AF_NETBEUI" , "rlock-AF_SECURITY" ,
256 "rlock-AF_KEY" , "rlock-AF_NETLINK" , "rlock-AF_PACKET" ,
257 "rlock-AF_ASH" , "rlock-AF_ECONET" , "rlock-AF_ATMSVC" ,
258 "rlock-AF_RDS" , "rlock-AF_SNA" , "rlock-AF_IRDA" ,
259 "rlock-AF_PPPOX" , "rlock-AF_WANPIPE" , "rlock-AF_LLC" ,
260 "rlock-27" , "rlock-28" , "rlock-AF_CAN" ,
261 "rlock-AF_TIPC" , "rlock-AF_BLUETOOTH", "rlock-AF_IUCV" ,
262 "rlock-AF_RXRPC" , "rlock-AF_ISDN" , "rlock-AF_PHONET" ,
263 "rlock-AF_IEEE802154", "rlock-AF_CAIF" , "rlock-AF_ALG" ,
264 "rlock-AF_NFC" , "rlock-AF_VSOCK" , "rlock-AF_KCM" ,
265 "rlock-AF_QIPCRTR", "rlock-AF_SMC" , "rlock-AF_MAX"
266};
267static const char *const af_family_wlock_key_strings[AF_MAX+1] = {
268 "wlock-AF_UNSPEC", "wlock-AF_UNIX" , "wlock-AF_INET" ,
269 "wlock-AF_AX25" , "wlock-AF_IPX" , "wlock-AF_APPLETALK",
270 "wlock-AF_NETROM", "wlock-AF_BRIDGE" , "wlock-AF_ATMPVC" ,
271 "wlock-AF_X25" , "wlock-AF_INET6" , "wlock-AF_ROSE" ,
272 "wlock-AF_DECnet", "wlock-AF_NETBEUI" , "wlock-AF_SECURITY" ,
273 "wlock-AF_KEY" , "wlock-AF_NETLINK" , "wlock-AF_PACKET" ,
274 "wlock-AF_ASH" , "wlock-AF_ECONET" , "wlock-AF_ATMSVC" ,
275 "wlock-AF_RDS" , "wlock-AF_SNA" , "wlock-AF_IRDA" ,
276 "wlock-AF_PPPOX" , "wlock-AF_WANPIPE" , "wlock-AF_LLC" ,
277 "wlock-27" , "wlock-28" , "wlock-AF_CAN" ,
278 "wlock-AF_TIPC" , "wlock-AF_BLUETOOTH", "wlock-AF_IUCV" ,
279 "wlock-AF_RXRPC" , "wlock-AF_ISDN" , "wlock-AF_PHONET" ,
280 "wlock-AF_IEEE802154", "wlock-AF_CAIF" , "wlock-AF_ALG" ,
281 "wlock-AF_NFC" , "wlock-AF_VSOCK" , "wlock-AF_KCM" ,
282 "wlock-AF_QIPCRTR", "wlock-AF_SMC" , "wlock-AF_MAX"
283};
284static const char *const af_family_elock_key_strings[AF_MAX+1] = {
285 "elock-AF_UNSPEC", "elock-AF_UNIX" , "elock-AF_INET" ,
286 "elock-AF_AX25" , "elock-AF_IPX" , "elock-AF_APPLETALK",
287 "elock-AF_NETROM", "elock-AF_BRIDGE" , "elock-AF_ATMPVC" ,
288 "elock-AF_X25" , "elock-AF_INET6" , "elock-AF_ROSE" ,
289 "elock-AF_DECnet", "elock-AF_NETBEUI" , "elock-AF_SECURITY" ,
290 "elock-AF_KEY" , "elock-AF_NETLINK" , "elock-AF_PACKET" ,
291 "elock-AF_ASH" , "elock-AF_ECONET" , "elock-AF_ATMSVC" ,
292 "elock-AF_RDS" , "elock-AF_SNA" , "elock-AF_IRDA" ,
293 "elock-AF_PPPOX" , "elock-AF_WANPIPE" , "elock-AF_LLC" ,
294 "elock-27" , "elock-28" , "elock-AF_CAN" ,
295 "elock-AF_TIPC" , "elock-AF_BLUETOOTH", "elock-AF_IUCV" ,
296 "elock-AF_RXRPC" , "elock-AF_ISDN" , "elock-AF_PHONET" ,
297 "elock-AF_IEEE802154", "elock-AF_CAIF" , "elock-AF_ALG" ,
298 "elock-AF_NFC" , "elock-AF_VSOCK" , "elock-AF_KCM" ,
299 "elock-AF_QIPCRTR", "elock-AF_SMC" , "elock-AF_MAX"
300};
301
302/*
303 * sk_callback_lock and sk queues locking rules are per-address-family,
304 * so split the lock classes by using a per-AF key:
305 */
306static struct lock_class_key af_callback_keys[AF_MAX];
307static struct lock_class_key af_rlock_keys[AF_MAX];
308static struct lock_class_key af_wlock_keys[AF_MAX];
309static struct lock_class_key af_elock_keys[AF_MAX];
310static struct lock_class_key af_kern_callback_keys[AF_MAX];
311
312/* Run time adjustable parameters. */
313__u32 sysctl_wmem_max __read_mostly = SK_WMEM_MAX;
314EXPORT_SYMBOL(sysctl_wmem_max);
315__u32 sysctl_rmem_max __read_mostly = SK_RMEM_MAX;
316EXPORT_SYMBOL(sysctl_rmem_max);
317__u32 sysctl_wmem_default __read_mostly = SK_WMEM_MAX;
318__u32 sysctl_rmem_default __read_mostly = SK_RMEM_MAX;
319
320/* Maximal space eaten by iovec or ancillary data plus some space */
321int sysctl_optmem_max __read_mostly = sizeof(unsigned long)*(2*UIO_MAXIOV+512);
322EXPORT_SYMBOL(sysctl_optmem_max);
323
324int sysctl_tstamp_allow_data __read_mostly = 1;
325
326struct static_key memalloc_socks = STATIC_KEY_INIT_FALSE;
327EXPORT_SYMBOL_GPL(memalloc_socks);
328
329/**
330 * sk_set_memalloc - sets %SOCK_MEMALLOC
331 * @sk: socket to set it on
332 *
333 * Set %SOCK_MEMALLOC on a socket for access to emergency reserves.
334 * It's the responsibility of the admin to adjust min_free_kbytes
335 * to meet the requirements
336 */
337void sk_set_memalloc(struct sock *sk)
338{
339 sock_set_flag(sk, SOCK_MEMALLOC);
340 sk->sk_allocation |= __GFP_MEMALLOC;
341 static_key_slow_inc(&memalloc_socks);
342}
343EXPORT_SYMBOL_GPL(sk_set_memalloc);
344
345void sk_clear_memalloc(struct sock *sk)
346{
347 sock_reset_flag(sk, SOCK_MEMALLOC);
348 sk->sk_allocation &= ~__GFP_MEMALLOC;
349 static_key_slow_dec(&memalloc_socks);
350
351 /*
352 * SOCK_MEMALLOC is allowed to ignore rmem limits to ensure forward
353 * progress of swapping. SOCK_MEMALLOC may be cleared while
354 * it has rmem allocations due to the last swapfile being deactivated
355 * but there is a risk that the socket is unusable due to exceeding
356 * the rmem limits. Reclaim the reserves and obey rmem limits again.
357 */
358 sk_mem_reclaim(sk);
359}
360EXPORT_SYMBOL_GPL(sk_clear_memalloc);
361
362int __sk_backlog_rcv(struct sock *sk, struct sk_buff *skb)
363{
364 int ret;
365 unsigned int noreclaim_flag;
366
367 /* these should have been dropped before queueing */
368 BUG_ON(!sock_flag(sk, SOCK_MEMALLOC));
369
370 noreclaim_flag = memalloc_noreclaim_save();
371 ret = sk->sk_backlog_rcv(sk, skb);
372 memalloc_noreclaim_restore(noreclaim_flag);
373
374 return ret;
375}
376EXPORT_SYMBOL(__sk_backlog_rcv);
377
378static int sock_set_timeout(long *timeo_p, char __user *optval, int optlen)
379{
380 struct timeval tv;
381
382 if (optlen < sizeof(tv))
383 return -EINVAL;
384 if (copy_from_user(&tv, optval, sizeof(tv)))
385 return -EFAULT;
386 if (tv.tv_usec < 0 || tv.tv_usec >= USEC_PER_SEC)
387 return -EDOM;
388
389 if (tv.tv_sec < 0) {
390 static int warned __read_mostly;
391
392 *timeo_p = 0;
393 if (warned < 10 && net_ratelimit()) {
394 warned++;
395 pr_info("%s: `%s' (pid %d) tries to set negative timeout\n",
396 __func__, current->comm, task_pid_nr(current));
397 }
398 return 0;
399 }
400 *timeo_p = MAX_SCHEDULE_TIMEOUT;
401 if (tv.tv_sec == 0 && tv.tv_usec == 0)
402 return 0;
403 if (tv.tv_sec < (MAX_SCHEDULE_TIMEOUT/HZ - 1))
404 *timeo_p = tv.tv_sec * HZ + DIV_ROUND_UP(tv.tv_usec, USEC_PER_SEC / HZ);
405 return 0;
406}
407
408static void sock_warn_obsolete_bsdism(const char *name)
409{
410 static int warned;
411 static char warncomm[TASK_COMM_LEN];
412 if (strcmp(warncomm, current->comm) && warned < 5) {
413 strcpy(warncomm, current->comm);
414 pr_warn("process `%s' is using obsolete %s SO_BSDCOMPAT\n",
415 warncomm, name);
416 warned++;
417 }
418}
419
420static bool sock_needs_netstamp(const struct sock *sk)
421{
422 switch (sk->sk_family) {
423 case AF_UNSPEC:
424 case AF_UNIX:
425 return false;
426 default:
427 return true;
428 }
429}
430
431static void sock_disable_timestamp(struct sock *sk, unsigned long flags)
432{
433 if (sk->sk_flags & flags) {
434 sk->sk_flags &= ~flags;
435 if (sock_needs_netstamp(sk) &&
436 !(sk->sk_flags & SK_FLAGS_TIMESTAMP))
437 net_disable_timestamp();
438 }
439}
440
441
442int __sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
443{
444 unsigned long flags;
445 struct sk_buff_head *list = &sk->sk_receive_queue;
446
447 if (atomic_read(&sk->sk_rmem_alloc) >= sk->sk_rcvbuf) {
448 atomic_inc(&sk->sk_drops);
449 trace_sock_rcvqueue_full(sk, skb);
450 return -ENOMEM;
451 }
452
453 if (!sk_rmem_schedule(sk, skb, skb->truesize)) {
454 atomic_inc(&sk->sk_drops);
455 return -ENOBUFS;
456 }
457
458 skb->dev = NULL;
459 skb_set_owner_r(skb, sk);
460
461 /* we escape from rcu protected region, make sure we dont leak
462 * a norefcounted dst
463 */
464 skb_dst_force(skb);
465
466 spin_lock_irqsave(&list->lock, flags);
467 sock_skb_set_dropcount(sk, skb);
468 __skb_queue_tail(list, skb);
469 spin_unlock_irqrestore(&list->lock, flags);
470
471 if (!sock_flag(sk, SOCK_DEAD))
472 sk->sk_data_ready(sk);
473 return 0;
474}
475EXPORT_SYMBOL(__sock_queue_rcv_skb);
476
477int sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
478{
479 int err;
480
481 err = sk_filter(sk, skb);
482 if (err)
483 return err;
484
485 return __sock_queue_rcv_skb(sk, skb);
486}
487EXPORT_SYMBOL(sock_queue_rcv_skb);
488
489int __sk_receive_skb(struct sock *sk, struct sk_buff *skb,
490 const int nested, unsigned int trim_cap, bool refcounted)
491{
492 int rc = NET_RX_SUCCESS;
493
494 if (sk_filter_trim_cap(sk, skb, trim_cap))
495 goto discard_and_relse;
496
497 skb->dev = NULL;
498
499 if (sk_rcvqueues_full(sk, sk->sk_rcvbuf)) {
500 atomic_inc(&sk->sk_drops);
501 goto discard_and_relse;
502 }
503 if (nested)
504 bh_lock_sock_nested(sk);
505 else
506 bh_lock_sock(sk);
507 if (!sock_owned_by_user(sk)) {
508 /*
509 * trylock + unlock semantics:
510 */
511 mutex_acquire(&sk->sk_lock.dep_map, 0, 1, _RET_IP_);
512
513 rc = sk_backlog_rcv(sk, skb);
514
515 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_);
516 } else if (sk_add_backlog(sk, skb, sk->sk_rcvbuf)) {
517 bh_unlock_sock(sk);
518 atomic_inc(&sk->sk_drops);
519 goto discard_and_relse;
520 }
521
522 bh_unlock_sock(sk);
523out:
524 if (refcounted)
525 sock_put(sk);
526 return rc;
527discard_and_relse:
528 kfree_skb(skb);
529 goto out;
530}
531EXPORT_SYMBOL(__sk_receive_skb);
532
533struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie)
534{
535 struct dst_entry *dst = __sk_dst_get(sk);
536
537 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
538 sk_tx_queue_clear(sk);
539 sk->sk_dst_pending_confirm = 0;
540 RCU_INIT_POINTER(sk->sk_dst_cache, NULL);
541 dst_release(dst);
542 return NULL;
543 }
544
545 return dst;
546}
547EXPORT_SYMBOL(__sk_dst_check);
548
549struct dst_entry *sk_dst_check(struct sock *sk, u32 cookie)
550{
551 struct dst_entry *dst = sk_dst_get(sk);
552
553 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
554 sk_dst_reset(sk);
555 dst_release(dst);
556 return NULL;
557 }
558
559 return dst;
560}
561EXPORT_SYMBOL(sk_dst_check);
562
563static int sock_setbindtodevice(struct sock *sk, char __user *optval,
564 int optlen)
565{
566 int ret = -ENOPROTOOPT;
567#ifdef CONFIG_NETDEVICES
568 struct net *net = sock_net(sk);
569 char devname[IFNAMSIZ];
570 int index;
571
572 /* Sorry... */
573 ret = -EPERM;
574 if (!ns_capable(net->user_ns, CAP_NET_RAW))
575 goto out;
576
577 ret = -EINVAL;
578 if (optlen < 0)
579 goto out;
580
581 /* Bind this socket to a particular device like "eth0",
582 * as specified in the passed interface name. If the
583 * name is "" or the option length is zero the socket
584 * is not bound.
585 */
586 if (optlen > IFNAMSIZ - 1)
587 optlen = IFNAMSIZ - 1;
588 memset(devname, 0, sizeof(devname));
589
590 ret = -EFAULT;
591 if (copy_from_user(devname, optval, optlen))
592 goto out;
593
594 index = 0;
595 if (devname[0] != '\0') {
596 struct net_device *dev;
597
598 rcu_read_lock();
599 dev = dev_get_by_name_rcu(net, devname);
600 if (dev)
601 index = dev->ifindex;
602 rcu_read_unlock();
603 ret = -ENODEV;
604 if (!dev)
605 goto out;
606 }
607
608 lock_sock(sk);
609 sk->sk_bound_dev_if = index;
610 sk_dst_reset(sk);
611 release_sock(sk);
612
613 ret = 0;
614
615out:
616#endif
617
618 return ret;
619}
620
621static int sock_getbindtodevice(struct sock *sk, char __user *optval,
622 int __user *optlen, int len)
623{
624 int ret = -ENOPROTOOPT;
625#ifdef CONFIG_NETDEVICES
626 struct net *net = sock_net(sk);
627 char devname[IFNAMSIZ];
628
629 if (sk->sk_bound_dev_if == 0) {
630 len = 0;
631 goto zero;
632 }
633
634 ret = -EINVAL;
635 if (len < IFNAMSIZ)
636 goto out;
637
638 ret = netdev_get_name(net, devname, sk->sk_bound_dev_if);
639 if (ret)
640 goto out;
641
642 len = strlen(devname) + 1;
643
644 ret = -EFAULT;
645 if (copy_to_user(optval, devname, len))
646 goto out;
647
648zero:
649 ret = -EFAULT;
650 if (put_user(len, optlen))
651 goto out;
652
653 ret = 0;
654
655out:
656#endif
657
658 return ret;
659}
660
661static inline void sock_valbool_flag(struct sock *sk, int bit, int valbool)
662{
663 if (valbool)
664 sock_set_flag(sk, bit);
665 else
666 sock_reset_flag(sk, bit);
667}
668
669bool sk_mc_loop(struct sock *sk)
670{
671 if (dev_recursion_level())
672 return false;
673 if (!sk)
674 return true;
675 switch (sk->sk_family) {
676 case AF_INET:
677 return inet_sk(sk)->mc_loop;
678#if IS_ENABLED(CONFIG_IPV6)
679 case AF_INET6:
680 return inet6_sk(sk)->mc_loop;
681#endif
682 }
683 WARN_ON(1);
684 return true;
685}
686EXPORT_SYMBOL(sk_mc_loop);
687
688/*
689 * This is meant for all protocols to use and covers goings on
690 * at the socket level. Everything here is generic.
691 */
692
693int sock_setsockopt(struct socket *sock, int level, int optname,
694 char __user *optval, unsigned int optlen)
695{
696 struct sock *sk = sock->sk;
697 int val;
698 int valbool;
699 struct linger ling;
700 int ret = 0;
701
702 /*
703 * Options without arguments
704 */
705
706 if (optname == SO_BINDTODEVICE)
707 return sock_setbindtodevice(sk, optval, optlen);
708
709 if (optlen < sizeof(int))
710 return -EINVAL;
711
712 if (get_user(val, (int __user *)optval))
713 return -EFAULT;
714
715 valbool = val ? 1 : 0;
716
717 lock_sock(sk);
718
719 switch (optname) {
720 case SO_DEBUG:
721 if (val && !capable(CAP_NET_ADMIN))
722 ret = -EACCES;
723 else
724 sock_valbool_flag(sk, SOCK_DBG, valbool);
725 break;
726 case SO_REUSEADDR:
727 sk->sk_reuse = (valbool ? SK_CAN_REUSE : SK_NO_REUSE);
728 break;
729 case SO_REUSEPORT:
730 sk->sk_reuseport = valbool;
731 break;
732 case SO_TYPE:
733 case SO_PROTOCOL:
734 case SO_DOMAIN:
735 case SO_ERROR:
736 ret = -ENOPROTOOPT;
737 break;
738 case SO_DONTROUTE:
739 sock_valbool_flag(sk, SOCK_LOCALROUTE, valbool);
740 break;
741 case SO_BROADCAST:
742 sock_valbool_flag(sk, SOCK_BROADCAST, valbool);
743 break;
744 case SO_SNDBUF:
745 /* Don't error on this BSD doesn't and if you think
746 * about it this is right. Otherwise apps have to
747 * play 'guess the biggest size' games. RCVBUF/SNDBUF
748 * are treated in BSD as hints
749 */
750 val = min_t(u32, val, sysctl_wmem_max);
751set_sndbuf:
752 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
753 sk->sk_sndbuf = max_t(int, val * 2, SOCK_MIN_SNDBUF);
754 /* Wake up sending tasks if we upped the value. */
755 sk->sk_write_space(sk);
756 break;
757
758 case SO_SNDBUFFORCE:
759 if (!capable(CAP_NET_ADMIN)) {
760 ret = -EPERM;
761 break;
762 }
763 goto set_sndbuf;
764
765 case SO_RCVBUF:
766 /* Don't error on this BSD doesn't and if you think
767 * about it this is right. Otherwise apps have to
768 * play 'guess the biggest size' games. RCVBUF/SNDBUF
769 * are treated in BSD as hints
770 */
771 val = min_t(u32, val, sysctl_rmem_max);
772set_rcvbuf:
773 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
774 /*
775 * We double it on the way in to account for
776 * "struct sk_buff" etc. overhead. Applications
777 * assume that the SO_RCVBUF setting they make will
778 * allow that much actual data to be received on that
779 * socket.
780 *
781 * Applications are unaware that "struct sk_buff" and
782 * other overheads allocate from the receive buffer
783 * during socket buffer allocation.
784 *
785 * And after considering the possible alternatives,
786 * returning the value we actually used in getsockopt
787 * is the most desirable behavior.
788 */
789 sk->sk_rcvbuf = max_t(int, val * 2, SOCK_MIN_RCVBUF);
790 break;
791
792 case SO_RCVBUFFORCE:
793 if (!capable(CAP_NET_ADMIN)) {
794 ret = -EPERM;
795 break;
796 }
797 goto set_rcvbuf;
798
799 case SO_KEEPALIVE:
800 if (sk->sk_prot->keepalive)
801 sk->sk_prot->keepalive(sk, valbool);
802 sock_valbool_flag(sk, SOCK_KEEPOPEN, valbool);
803 break;
804
805 case SO_OOBINLINE:
806 sock_valbool_flag(sk, SOCK_URGINLINE, valbool);
807 break;
808
809 case SO_NO_CHECK:
810 sk->sk_no_check_tx = valbool;
811 break;
812
813 case SO_PRIORITY:
814 if ((val >= 0 && val <= 6) ||
815 ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
816 sk->sk_priority = val;
817 else
818 ret = -EPERM;
819 break;
820
821 case SO_LINGER:
822 if (optlen < sizeof(ling)) {
823 ret = -EINVAL; /* 1003.1g */
824 break;
825 }
826 if (copy_from_user(&ling, optval, sizeof(ling))) {
827 ret = -EFAULT;
828 break;
829 }
830 if (!ling.l_onoff)
831 sock_reset_flag(sk, SOCK_LINGER);
832 else {
833#if (BITS_PER_LONG == 32)
834 if ((unsigned int)ling.l_linger >= MAX_SCHEDULE_TIMEOUT/HZ)
835 sk->sk_lingertime = MAX_SCHEDULE_TIMEOUT;
836 else
837#endif
838 sk->sk_lingertime = (unsigned int)ling.l_linger * HZ;
839 sock_set_flag(sk, SOCK_LINGER);
840 }
841 break;
842
843 case SO_BSDCOMPAT:
844 sock_warn_obsolete_bsdism("setsockopt");
845 break;
846
847 case SO_PASSCRED:
848 if (valbool)
849 set_bit(SOCK_PASSCRED, &sock->flags);
850 else
851 clear_bit(SOCK_PASSCRED, &sock->flags);
852 break;
853
854 case SO_TIMESTAMP:
855 case SO_TIMESTAMPNS:
856 if (valbool) {
857 if (optname == SO_TIMESTAMP)
858 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
859 else
860 sock_set_flag(sk, SOCK_RCVTSTAMPNS);
861 sock_set_flag(sk, SOCK_RCVTSTAMP);
862 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
863 } else {
864 sock_reset_flag(sk, SOCK_RCVTSTAMP);
865 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
866 }
867 break;
868
869 case SO_TIMESTAMPING:
870 if (val & ~SOF_TIMESTAMPING_MASK) {
871 ret = -EINVAL;
872 break;
873 }
874
875 if (val & SOF_TIMESTAMPING_OPT_ID &&
876 !(sk->sk_tsflags & SOF_TIMESTAMPING_OPT_ID)) {
877 if (sk->sk_protocol == IPPROTO_TCP &&
878 sk->sk_type == SOCK_STREAM) {
879 if ((1 << sk->sk_state) &
880 (TCPF_CLOSE | TCPF_LISTEN)) {
881 ret = -EINVAL;
882 break;
883 }
884 sk->sk_tskey = tcp_sk(sk)->snd_una;
885 } else {
886 sk->sk_tskey = 0;
887 }
888 }
889
890 if (val & SOF_TIMESTAMPING_OPT_STATS &&
891 !(val & SOF_TIMESTAMPING_OPT_TSONLY)) {
892 ret = -EINVAL;
893 break;
894 }
895
896 sk->sk_tsflags = val;
897 if (val & SOF_TIMESTAMPING_RX_SOFTWARE)
898 sock_enable_timestamp(sk,
899 SOCK_TIMESTAMPING_RX_SOFTWARE);
900 else
901 sock_disable_timestamp(sk,
902 (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE));
903 break;
904
905 case SO_RCVLOWAT:
906 if (val < 0)
907 val = INT_MAX;
908 sk->sk_rcvlowat = val ? : 1;
909 break;
910
911 case SO_RCVTIMEO:
912 ret = sock_set_timeout(&sk->sk_rcvtimeo, optval, optlen);
913 break;
914
915 case SO_SNDTIMEO:
916 ret = sock_set_timeout(&sk->sk_sndtimeo, optval, optlen);
917 break;
918
919 case SO_ATTACH_FILTER:
920 ret = -EINVAL;
921 if (optlen == sizeof(struct sock_fprog)) {
922 struct sock_fprog fprog;
923
924 ret = -EFAULT;
925 if (copy_from_user(&fprog, optval, sizeof(fprog)))
926 break;
927
928 ret = sk_attach_filter(&fprog, sk);
929 }
930 break;
931
932 case SO_ATTACH_BPF:
933 ret = -EINVAL;
934 if (optlen == sizeof(u32)) {
935 u32 ufd;
936
937 ret = -EFAULT;
938 if (copy_from_user(&ufd, optval, sizeof(ufd)))
939 break;
940
941 ret = sk_attach_bpf(ufd, sk);
942 }
943 break;
944
945 case SO_ATTACH_REUSEPORT_CBPF:
946 ret = -EINVAL;
947 if (optlen == sizeof(struct sock_fprog)) {
948 struct sock_fprog fprog;
949
950 ret = -EFAULT;
951 if (copy_from_user(&fprog, optval, sizeof(fprog)))
952 break;
953
954 ret = sk_reuseport_attach_filter(&fprog, sk);
955 }
956 break;
957
958 case SO_ATTACH_REUSEPORT_EBPF:
959 ret = -EINVAL;
960 if (optlen == sizeof(u32)) {
961 u32 ufd;
962
963 ret = -EFAULT;
964 if (copy_from_user(&ufd, optval, sizeof(ufd)))
965 break;
966
967 ret = sk_reuseport_attach_bpf(ufd, sk);
968 }
969 break;
970
971 case SO_DETACH_FILTER:
972 ret = sk_detach_filter(sk);
973 break;
974
975 case SO_LOCK_FILTER:
976 if (sock_flag(sk, SOCK_FILTER_LOCKED) && !valbool)
977 ret = -EPERM;
978 else
979 sock_valbool_flag(sk, SOCK_FILTER_LOCKED, valbool);
980 break;
981
982 case SO_PASSSEC:
983 if (valbool)
984 set_bit(SOCK_PASSSEC, &sock->flags);
985 else
986 clear_bit(SOCK_PASSSEC, &sock->flags);
987 break;
988 case SO_MARK:
989 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
990 ret = -EPERM;
991 else
992 sk->sk_mark = val;
993 break;
994
995 case SO_RXQ_OVFL:
996 sock_valbool_flag(sk, SOCK_RXQ_OVFL, valbool);
997 break;
998
999 case SO_WIFI_STATUS:
1000 sock_valbool_flag(sk, SOCK_WIFI_STATUS, valbool);
1001 break;
1002
1003 case SO_PEEK_OFF:
1004 if (sock->ops->set_peek_off)
1005 ret = sock->ops->set_peek_off(sk, val);
1006 else
1007 ret = -EOPNOTSUPP;
1008 break;
1009
1010 case SO_NOFCS:
1011 sock_valbool_flag(sk, SOCK_NOFCS, valbool);
1012 break;
1013
1014 case SO_SELECT_ERR_QUEUE:
1015 sock_valbool_flag(sk, SOCK_SELECT_ERR_QUEUE, valbool);
1016 break;
1017
1018#ifdef CONFIG_NET_RX_BUSY_POLL
1019 case SO_BUSY_POLL:
1020 /* allow unprivileged users to decrease the value */
1021 if ((val > sk->sk_ll_usec) && !capable(CAP_NET_ADMIN))
1022 ret = -EPERM;
1023 else {
1024 if (val < 0)
1025 ret = -EINVAL;
1026 else
1027 sk->sk_ll_usec = val;
1028 }
1029 break;
1030#endif
1031
1032 case SO_MAX_PACING_RATE:
1033 if (val != ~0U)
1034 cmpxchg(&sk->sk_pacing_status,
1035 SK_PACING_NONE,
1036 SK_PACING_NEEDED);
1037 sk->sk_max_pacing_rate = val;
1038 sk->sk_pacing_rate = min(sk->sk_pacing_rate,
1039 sk->sk_max_pacing_rate);
1040 break;
1041
1042 case SO_INCOMING_CPU:
1043 sk->sk_incoming_cpu = val;
1044 break;
1045
1046 case SO_CNX_ADVICE:
1047 if (val == 1)
1048 dst_negative_advice(sk);
1049 break;
1050
1051 case SO_ZEROCOPY:
1052 if (sk->sk_family == PF_INET || sk->sk_family == PF_INET6) {
1053 if (sk->sk_protocol != IPPROTO_TCP)
1054 ret = -ENOTSUPP;
1055 } else if (sk->sk_family != PF_RDS) {
1056 ret = -ENOTSUPP;
1057 }
1058 if (!ret) {
1059 if (val < 0 || val > 1)
1060 ret = -EINVAL;
1061 else
1062 sock_valbool_flag(sk, SOCK_ZEROCOPY, valbool);
1063 }
1064 break;
1065
1066 default:
1067 ret = -ENOPROTOOPT;
1068 break;
1069 }
1070 release_sock(sk);
1071 return ret;
1072}
1073EXPORT_SYMBOL(sock_setsockopt);
1074
1075
1076static void cred_to_ucred(struct pid *pid, const struct cred *cred,
1077 struct ucred *ucred)
1078{
1079 ucred->pid = pid_vnr(pid);
1080 ucred->uid = ucred->gid = -1;
1081 if (cred) {
1082 struct user_namespace *current_ns = current_user_ns();
1083
1084 ucred->uid = from_kuid_munged(current_ns, cred->euid);
1085 ucred->gid = from_kgid_munged(current_ns, cred->egid);
1086 }
1087}
1088
1089static int groups_to_user(gid_t __user *dst, const struct group_info *src)
1090{
1091 struct user_namespace *user_ns = current_user_ns();
1092 int i;
1093
1094 for (i = 0; i < src->ngroups; i++)
1095 if (put_user(from_kgid_munged(user_ns, src->gid[i]), dst + i))
1096 return -EFAULT;
1097
1098 return 0;
1099}
1100
1101int sock_getsockopt(struct socket *sock, int level, int optname,
1102 char __user *optval, int __user *optlen)
1103{
1104 struct sock *sk = sock->sk;
1105
1106 union {
1107 int val;
1108 u64 val64;
1109 struct linger ling;
1110 struct timeval tm;
1111 } v;
1112
1113 int lv = sizeof(int);
1114 int len;
1115
1116 if (get_user(len, optlen))
1117 return -EFAULT;
1118 if (len < 0)
1119 return -EINVAL;
1120
1121 memset(&v, 0, sizeof(v));
1122
1123 switch (optname) {
1124 case SO_DEBUG:
1125 v.val = sock_flag(sk, SOCK_DBG);
1126 break;
1127
1128 case SO_DONTROUTE:
1129 v.val = sock_flag(sk, SOCK_LOCALROUTE);
1130 break;
1131
1132 case SO_BROADCAST:
1133 v.val = sock_flag(sk, SOCK_BROADCAST);
1134 break;
1135
1136 case SO_SNDBUF:
1137 v.val = sk->sk_sndbuf;
1138 break;
1139
1140 case SO_RCVBUF:
1141 v.val = sk->sk_rcvbuf;
1142 break;
1143
1144 case SO_REUSEADDR:
1145 v.val = sk->sk_reuse;
1146 break;
1147
1148 case SO_REUSEPORT:
1149 v.val = sk->sk_reuseport;
1150 break;
1151
1152 case SO_KEEPALIVE:
1153 v.val = sock_flag(sk, SOCK_KEEPOPEN);
1154 break;
1155
1156 case SO_TYPE:
1157 v.val = sk->sk_type;
1158 break;
1159
1160 case SO_PROTOCOL:
1161 v.val = sk->sk_protocol;
1162 break;
1163
1164 case SO_DOMAIN:
1165 v.val = sk->sk_family;
1166 break;
1167
1168 case SO_ERROR:
1169 v.val = -sock_error(sk);
1170 if (v.val == 0)
1171 v.val = xchg(&sk->sk_err_soft, 0);
1172 break;
1173
1174 case SO_OOBINLINE:
1175 v.val = sock_flag(sk, SOCK_URGINLINE);
1176 break;
1177
1178 case SO_NO_CHECK:
1179 v.val = sk->sk_no_check_tx;
1180 break;
1181
1182 case SO_PRIORITY:
1183 v.val = sk->sk_priority;
1184 break;
1185
1186 case SO_LINGER:
1187 lv = sizeof(v.ling);
1188 v.ling.l_onoff = sock_flag(sk, SOCK_LINGER);
1189 v.ling.l_linger = sk->sk_lingertime / HZ;
1190 break;
1191
1192 case SO_BSDCOMPAT:
1193 sock_warn_obsolete_bsdism("getsockopt");
1194 break;
1195
1196 case SO_TIMESTAMP:
1197 v.val = sock_flag(sk, SOCK_RCVTSTAMP) &&
1198 !sock_flag(sk, SOCK_RCVTSTAMPNS);
1199 break;
1200
1201 case SO_TIMESTAMPNS:
1202 v.val = sock_flag(sk, SOCK_RCVTSTAMPNS);
1203 break;
1204
1205 case SO_TIMESTAMPING:
1206 v.val = sk->sk_tsflags;
1207 break;
1208
1209 case SO_RCVTIMEO:
1210 lv = sizeof(struct timeval);
1211 if (sk->sk_rcvtimeo == MAX_SCHEDULE_TIMEOUT) {
1212 v.tm.tv_sec = 0;
1213 v.tm.tv_usec = 0;
1214 } else {
1215 v.tm.tv_sec = sk->sk_rcvtimeo / HZ;
1216 v.tm.tv_usec = ((sk->sk_rcvtimeo % HZ) * USEC_PER_SEC) / HZ;
1217 }
1218 break;
1219
1220 case SO_SNDTIMEO:
1221 lv = sizeof(struct timeval);
1222 if (sk->sk_sndtimeo == MAX_SCHEDULE_TIMEOUT) {
1223 v.tm.tv_sec = 0;
1224 v.tm.tv_usec = 0;
1225 } else {
1226 v.tm.tv_sec = sk->sk_sndtimeo / HZ;
1227 v.tm.tv_usec = ((sk->sk_sndtimeo % HZ) * USEC_PER_SEC) / HZ;
1228 }
1229 break;
1230
1231 case SO_RCVLOWAT:
1232 v.val = sk->sk_rcvlowat;
1233 break;
1234
1235 case SO_SNDLOWAT:
1236 v.val = 1;
1237 break;
1238
1239 case SO_PASSCRED:
1240 v.val = !!test_bit(SOCK_PASSCRED, &sock->flags);
1241 break;
1242
1243 case SO_PEERCRED:
1244 {
1245 struct ucred peercred;
1246 if (len > sizeof(peercred))
1247 len = sizeof(peercred);
1248 cred_to_ucred(sk->sk_peer_pid, sk->sk_peer_cred, &peercred);
1249 if (copy_to_user(optval, &peercred, len))
1250 return -EFAULT;
1251 goto lenout;
1252 }
1253
1254 case SO_PEERGROUPS:
1255 {
1256 int ret, n;
1257
1258 if (!sk->sk_peer_cred)
1259 return -ENODATA;
1260
1261 n = sk->sk_peer_cred->group_info->ngroups;
1262 if (len < n * sizeof(gid_t)) {
1263 len = n * sizeof(gid_t);
1264 return put_user(len, optlen) ? -EFAULT : -ERANGE;
1265 }
1266 len = n * sizeof(gid_t);
1267
1268 ret = groups_to_user((gid_t __user *)optval,
1269 sk->sk_peer_cred->group_info);
1270 if (ret)
1271 return ret;
1272 goto lenout;
1273 }
1274
1275 case SO_PEERNAME:
1276 {
1277 char address[128];
1278
1279 lv = sock->ops->getname(sock, (struct sockaddr *)address, 2);
1280 if (lv < 0)
1281 return -ENOTCONN;
1282 if (lv < len)
1283 return -EINVAL;
1284 if (copy_to_user(optval, address, len))
1285 return -EFAULT;
1286 goto lenout;
1287 }
1288
1289 /* Dubious BSD thing... Probably nobody even uses it, but
1290 * the UNIX standard wants it for whatever reason... -DaveM
1291 */
1292 case SO_ACCEPTCONN:
1293 v.val = sk->sk_state == TCP_LISTEN;
1294 break;
1295
1296 case SO_PASSSEC:
1297 v.val = !!test_bit(SOCK_PASSSEC, &sock->flags);
1298 break;
1299
1300 case SO_PEERSEC:
1301 return security_socket_getpeersec_stream(sock, optval, optlen, len);
1302
1303 case SO_MARK:
1304 v.val = sk->sk_mark;
1305 break;
1306
1307 case SO_RXQ_OVFL:
1308 v.val = sock_flag(sk, SOCK_RXQ_OVFL);
1309 break;
1310
1311 case SO_WIFI_STATUS:
1312 v.val = sock_flag(sk, SOCK_WIFI_STATUS);
1313 break;
1314
1315 case SO_PEEK_OFF:
1316 if (!sock->ops->set_peek_off)
1317 return -EOPNOTSUPP;
1318
1319 v.val = sk->sk_peek_off;
1320 break;
1321 case SO_NOFCS:
1322 v.val = sock_flag(sk, SOCK_NOFCS);
1323 break;
1324
1325 case SO_BINDTODEVICE:
1326 return sock_getbindtodevice(sk, optval, optlen, len);
1327
1328 case SO_GET_FILTER:
1329 len = sk_get_filter(sk, (struct sock_filter __user *)optval, len);
1330 if (len < 0)
1331 return len;
1332
1333 goto lenout;
1334
1335 case SO_LOCK_FILTER:
1336 v.val = sock_flag(sk, SOCK_FILTER_LOCKED);
1337 break;
1338
1339 case SO_BPF_EXTENSIONS:
1340 v.val = bpf_tell_extensions();
1341 break;
1342
1343 case SO_SELECT_ERR_QUEUE:
1344 v.val = sock_flag(sk, SOCK_SELECT_ERR_QUEUE);
1345 break;
1346
1347#ifdef CONFIG_NET_RX_BUSY_POLL
1348 case SO_BUSY_POLL:
1349 v.val = sk->sk_ll_usec;
1350 break;
1351#endif
1352
1353 case SO_MAX_PACING_RATE:
1354 v.val = sk->sk_max_pacing_rate;
1355 break;
1356
1357 case SO_INCOMING_CPU:
1358 v.val = sk->sk_incoming_cpu;
1359 break;
1360
1361 case SO_MEMINFO:
1362 {
1363 u32 meminfo[SK_MEMINFO_VARS];
1364
1365 if (get_user(len, optlen))
1366 return -EFAULT;
1367
1368 sk_get_meminfo(sk, meminfo);
1369
1370 len = min_t(unsigned int, len, sizeof(meminfo));
1371 if (copy_to_user(optval, &meminfo, len))
1372 return -EFAULT;
1373
1374 goto lenout;
1375 }
1376
1377#ifdef CONFIG_NET_RX_BUSY_POLL
1378 case SO_INCOMING_NAPI_ID:
1379 v.val = READ_ONCE(sk->sk_napi_id);
1380
1381 /* aggregate non-NAPI IDs down to 0 */
1382 if (v.val < MIN_NAPI_ID)
1383 v.val = 0;
1384
1385 break;
1386#endif
1387
1388 case SO_COOKIE:
1389 lv = sizeof(u64);
1390 if (len < lv)
1391 return -EINVAL;
1392 v.val64 = sock_gen_cookie(sk);
1393 break;
1394
1395 case SO_ZEROCOPY:
1396 v.val = sock_flag(sk, SOCK_ZEROCOPY);
1397 break;
1398
1399 default:
1400 /* We implement the SO_SNDLOWAT etc to not be settable
1401 * (1003.1g 7).
1402 */
1403 return -ENOPROTOOPT;
1404 }
1405
1406 if (len > lv)
1407 len = lv;
1408 if (copy_to_user(optval, &v, len))
1409 return -EFAULT;
1410lenout:
1411 if (put_user(len, optlen))
1412 return -EFAULT;
1413 return 0;
1414}
1415
1416/*
1417 * Initialize an sk_lock.
1418 *
1419 * (We also register the sk_lock with the lock validator.)
1420 */
1421static inline void sock_lock_init(struct sock *sk)
1422{
1423 if (sk->sk_kern_sock)
1424 sock_lock_init_class_and_name(
1425 sk,
1426 af_family_kern_slock_key_strings[sk->sk_family],
1427 af_family_kern_slock_keys + sk->sk_family,
1428 af_family_kern_key_strings[sk->sk_family],
1429 af_family_kern_keys + sk->sk_family);
1430 else
1431 sock_lock_init_class_and_name(
1432 sk,
1433 af_family_slock_key_strings[sk->sk_family],
1434 af_family_slock_keys + sk->sk_family,
1435 af_family_key_strings[sk->sk_family],
1436 af_family_keys + sk->sk_family);
1437}
1438
1439/*
1440 * Copy all fields from osk to nsk but nsk->sk_refcnt must not change yet,
1441 * even temporarly, because of RCU lookups. sk_node should also be left as is.
1442 * We must not copy fields between sk_dontcopy_begin and sk_dontcopy_end
1443 */
1444static void sock_copy(struct sock *nsk, const struct sock *osk)
1445{
1446#ifdef CONFIG_SECURITY_NETWORK
1447 void *sptr = nsk->sk_security;
1448#endif
1449 memcpy(nsk, osk, offsetof(struct sock, sk_dontcopy_begin));
1450
1451 memcpy(&nsk->sk_dontcopy_end, &osk->sk_dontcopy_end,
1452 osk->sk_prot->obj_size - offsetof(struct sock, sk_dontcopy_end));
1453
1454#ifdef CONFIG_SECURITY_NETWORK
1455 nsk->sk_security = sptr;
1456 security_sk_clone(osk, nsk);
1457#endif
1458}
1459
1460static struct sock *sk_prot_alloc(struct proto *prot, gfp_t priority,
1461 int family)
1462{
1463 struct sock *sk;
1464 struct kmem_cache *slab;
1465
1466 slab = prot->slab;
1467 if (slab != NULL) {
1468 sk = kmem_cache_alloc(slab, priority & ~__GFP_ZERO);
1469 if (!sk)
1470 return sk;
1471 if (priority & __GFP_ZERO)
1472 sk_prot_clear_nulls(sk, prot->obj_size);
1473 } else
1474 sk = kmalloc(prot->obj_size, priority);
1475
1476 if (sk != NULL) {
1477 if (security_sk_alloc(sk, family, priority))
1478 goto out_free;
1479
1480 if (!try_module_get(prot->owner))
1481 goto out_free_sec;
1482 sk_tx_queue_clear(sk);
1483 }
1484
1485 return sk;
1486
1487out_free_sec:
1488 security_sk_free(sk);
1489out_free:
1490 if (slab != NULL)
1491 kmem_cache_free(slab, sk);
1492 else
1493 kfree(sk);
1494 return NULL;
1495}
1496
1497static void sk_prot_free(struct proto *prot, struct sock *sk)
1498{
1499 struct kmem_cache *slab;
1500 struct module *owner;
1501
1502 owner = prot->owner;
1503 slab = prot->slab;
1504
1505 cgroup_sk_free(&sk->sk_cgrp_data);
1506 mem_cgroup_sk_free(sk);
1507 security_sk_free(sk);
1508 if (slab != NULL)
1509 kmem_cache_free(slab, sk);
1510 else
1511 kfree(sk);
1512 module_put(owner);
1513}
1514
1515/**
1516 * sk_alloc - All socket objects are allocated here
1517 * @net: the applicable net namespace
1518 * @family: protocol family
1519 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
1520 * @prot: struct proto associated with this new sock instance
1521 * @kern: is this to be a kernel socket?
1522 */
1523struct sock *sk_alloc(struct net *net, int family, gfp_t priority,
1524 struct proto *prot, int kern)
1525{
1526 struct sock *sk;
1527
1528 sk = sk_prot_alloc(prot, priority | __GFP_ZERO, family);
1529 if (sk) {
1530 sk->sk_family = family;
1531 /*
1532 * See comment in struct sock definition to understand
1533 * why we need sk_prot_creator -acme
1534 */
1535 sk->sk_prot = sk->sk_prot_creator = prot;
1536 sk->sk_kern_sock = kern;
1537 sock_lock_init(sk);
1538 sk->sk_net_refcnt = kern ? 0 : 1;
1539 if (likely(sk->sk_net_refcnt)) {
1540 get_net(net);
1541 sock_inuse_add(net, 1);
1542 }
1543
1544 sock_net_set(sk, net);
1545 refcount_set(&sk->sk_wmem_alloc, 1);
1546
1547 mem_cgroup_sk_alloc(sk);
1548 cgroup_sk_alloc(&sk->sk_cgrp_data);
1549 sock_update_classid(&sk->sk_cgrp_data);
1550 sock_update_netprioidx(&sk->sk_cgrp_data);
1551 }
1552
1553 return sk;
1554}
1555EXPORT_SYMBOL(sk_alloc);
1556
1557/* Sockets having SOCK_RCU_FREE will call this function after one RCU
1558 * grace period. This is the case for UDP sockets and TCP listeners.
1559 */
1560static void __sk_destruct(struct rcu_head *head)
1561{
1562 struct sock *sk = container_of(head, struct sock, sk_rcu);
1563 struct sk_filter *filter;
1564
1565 if (sk->sk_destruct)
1566 sk->sk_destruct(sk);
1567
1568 filter = rcu_dereference_check(sk->sk_filter,
1569 refcount_read(&sk->sk_wmem_alloc) == 0);
1570 if (filter) {
1571 sk_filter_uncharge(sk, filter);
1572 RCU_INIT_POINTER(sk->sk_filter, NULL);
1573 }
1574 if (rcu_access_pointer(sk->sk_reuseport_cb))
1575 reuseport_detach_sock(sk);
1576
1577 sock_disable_timestamp(sk, SK_FLAGS_TIMESTAMP);
1578
1579 if (atomic_read(&sk->sk_omem_alloc))
1580 pr_debug("%s: optmem leakage (%d bytes) detected\n",
1581 __func__, atomic_read(&sk->sk_omem_alloc));
1582
1583 if (sk->sk_frag.page) {
1584 put_page(sk->sk_frag.page);
1585 sk->sk_frag.page = NULL;
1586 }
1587
1588 if (sk->sk_peer_cred)
1589 put_cred(sk->sk_peer_cred);
1590 put_pid(sk->sk_peer_pid);
1591 if (likely(sk->sk_net_refcnt))
1592 put_net(sock_net(sk));
1593 sk_prot_free(sk->sk_prot_creator, sk);
1594}
1595
1596void sk_destruct(struct sock *sk)
1597{
1598 if (sock_flag(sk, SOCK_RCU_FREE))
1599 call_rcu(&sk->sk_rcu, __sk_destruct);
1600 else
1601 __sk_destruct(&sk->sk_rcu);
1602}
1603
1604static void __sk_free(struct sock *sk)
1605{
1606 if (likely(sk->sk_net_refcnt))
1607 sock_inuse_add(sock_net(sk), -1);
1608
1609 if (unlikely(sk->sk_net_refcnt && sock_diag_has_destroy_listeners(sk)))
1610 sock_diag_broadcast_destroy(sk);
1611 else
1612 sk_destruct(sk);
1613}
1614
1615void sk_free(struct sock *sk)
1616{
1617 /*
1618 * We subtract one from sk_wmem_alloc and can know if
1619 * some packets are still in some tx queue.
1620 * If not null, sock_wfree() will call __sk_free(sk) later
1621 */
1622 if (refcount_dec_and_test(&sk->sk_wmem_alloc))
1623 __sk_free(sk);
1624}
1625EXPORT_SYMBOL(sk_free);
1626
1627static void sk_init_common(struct sock *sk)
1628{
1629 skb_queue_head_init(&sk->sk_receive_queue);
1630 skb_queue_head_init(&sk->sk_write_queue);
1631 skb_queue_head_init(&sk->sk_error_queue);
1632
1633 rwlock_init(&sk->sk_callback_lock);
1634 lockdep_set_class_and_name(&sk->sk_receive_queue.lock,
1635 af_rlock_keys + sk->sk_family,
1636 af_family_rlock_key_strings[sk->sk_family]);
1637 lockdep_set_class_and_name(&sk->sk_write_queue.lock,
1638 af_wlock_keys + sk->sk_family,
1639 af_family_wlock_key_strings[sk->sk_family]);
1640 lockdep_set_class_and_name(&sk->sk_error_queue.lock,
1641 af_elock_keys + sk->sk_family,
1642 af_family_elock_key_strings[sk->sk_family]);
1643 lockdep_set_class_and_name(&sk->sk_callback_lock,
1644 af_callback_keys + sk->sk_family,
1645 af_family_clock_key_strings[sk->sk_family]);
1646}
1647
1648/**
1649 * sk_clone_lock - clone a socket, and lock its clone
1650 * @sk: the socket to clone
1651 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
1652 *
1653 * Caller must unlock socket even in error path (bh_unlock_sock(newsk))
1654 */
1655struct sock *sk_clone_lock(const struct sock *sk, const gfp_t priority)
1656{
1657 struct sock *newsk;
1658 bool is_charged = true;
1659
1660 newsk = sk_prot_alloc(sk->sk_prot, priority, sk->sk_family);
1661 if (newsk != NULL) {
1662 struct sk_filter *filter;
1663
1664 sock_copy(newsk, sk);
1665
1666 newsk->sk_prot_creator = sk->sk_prot;
1667
1668 /* SANITY */
1669 if (likely(newsk->sk_net_refcnt))
1670 get_net(sock_net(newsk));
1671 sk_node_init(&newsk->sk_node);
1672 sock_lock_init(newsk);
1673 bh_lock_sock(newsk);
1674 newsk->sk_backlog.head = newsk->sk_backlog.tail = NULL;
1675 newsk->sk_backlog.len = 0;
1676
1677 atomic_set(&newsk->sk_rmem_alloc, 0);
1678 /*
1679 * sk_wmem_alloc set to one (see sk_free() and sock_wfree())
1680 */
1681 refcount_set(&newsk->sk_wmem_alloc, 1);
1682 atomic_set(&newsk->sk_omem_alloc, 0);
1683 sk_init_common(newsk);
1684
1685 newsk->sk_dst_cache = NULL;
1686 newsk->sk_dst_pending_confirm = 0;
1687 newsk->sk_wmem_queued = 0;
1688 newsk->sk_forward_alloc = 0;
1689 atomic_set(&newsk->sk_drops, 0);
1690 newsk->sk_send_head = NULL;
1691 newsk->sk_userlocks = sk->sk_userlocks & ~SOCK_BINDPORT_LOCK;
1692 atomic_set(&newsk->sk_zckey, 0);
1693
1694 sock_reset_flag(newsk, SOCK_DONE);
1695 mem_cgroup_sk_alloc(newsk);
1696 cgroup_sk_alloc(&newsk->sk_cgrp_data);
1697
1698 rcu_read_lock();
1699 filter = rcu_dereference(sk->sk_filter);
1700 if (filter != NULL)
1701 /* though it's an empty new sock, the charging may fail
1702 * if sysctl_optmem_max was changed between creation of
1703 * original socket and cloning
1704 */
1705 is_charged = sk_filter_charge(newsk, filter);
1706 RCU_INIT_POINTER(newsk->sk_filter, filter);
1707 rcu_read_unlock();
1708
1709 if (unlikely(!is_charged || xfrm_sk_clone_policy(newsk, sk))) {
1710 /* We need to make sure that we don't uncharge the new
1711 * socket if we couldn't charge it in the first place
1712 * as otherwise we uncharge the parent's filter.
1713 */
1714 if (!is_charged)
1715 RCU_INIT_POINTER(newsk->sk_filter, NULL);
1716 sk_free_unlock_clone(newsk);
1717 newsk = NULL;
1718 goto out;
1719 }
1720 RCU_INIT_POINTER(newsk->sk_reuseport_cb, NULL);
1721
1722 newsk->sk_err = 0;
1723 newsk->sk_err_soft = 0;
1724 newsk->sk_priority = 0;
1725 newsk->sk_incoming_cpu = raw_smp_processor_id();
1726 atomic64_set(&newsk->sk_cookie, 0);
1727 if (likely(newsk->sk_net_refcnt))
1728 sock_inuse_add(sock_net(newsk), 1);
1729
1730 /*
1731 * Before updating sk_refcnt, we must commit prior changes to memory
1732 * (Documentation/RCU/rculist_nulls.txt for details)
1733 */
1734 smp_wmb();
1735 refcount_set(&newsk->sk_refcnt, 2);
1736
1737 /*
1738 * Increment the counter in the same struct proto as the master
1739 * sock (sk_refcnt_debug_inc uses newsk->sk_prot->socks, that
1740 * is the same as sk->sk_prot->socks, as this field was copied
1741 * with memcpy).
1742 *
1743 * This _changes_ the previous behaviour, where
1744 * tcp_create_openreq_child always was incrementing the
1745 * equivalent to tcp_prot->socks (inet_sock_nr), so this have
1746 * to be taken into account in all callers. -acme
1747 */
1748 sk_refcnt_debug_inc(newsk);
1749 sk_set_socket(newsk, NULL);
1750 newsk->sk_wq = NULL;
1751
1752 if (newsk->sk_prot->sockets_allocated)
1753 sk_sockets_allocated_inc(newsk);
1754
1755 if (sock_needs_netstamp(sk) &&
1756 newsk->sk_flags & SK_FLAGS_TIMESTAMP)
1757 net_enable_timestamp();
1758 }
1759out:
1760 return newsk;
1761}
1762EXPORT_SYMBOL_GPL(sk_clone_lock);
1763
1764void sk_free_unlock_clone(struct sock *sk)
1765{
1766 /* It is still raw copy of parent, so invalidate
1767 * destructor and make plain sk_free() */
1768 sk->sk_destruct = NULL;
1769 bh_unlock_sock(sk);
1770 sk_free(sk);
1771}
1772EXPORT_SYMBOL_GPL(sk_free_unlock_clone);
1773
1774void sk_setup_caps(struct sock *sk, struct dst_entry *dst)
1775{
1776 u32 max_segs = 1;
1777
1778 sk_dst_set(sk, dst);
1779 sk->sk_route_caps = dst->dev->features | sk->sk_route_forced_caps;
1780 if (sk->sk_route_caps & NETIF_F_GSO)
1781 sk->sk_route_caps |= NETIF_F_GSO_SOFTWARE;
1782 sk->sk_route_caps &= ~sk->sk_route_nocaps;
1783 if (sk_can_gso(sk)) {
1784 if (dst->header_len && !xfrm_dst_offload_ok(dst)) {
1785 sk->sk_route_caps &= ~NETIF_F_GSO_MASK;
1786 } else {
1787 sk->sk_route_caps |= NETIF_F_SG | NETIF_F_HW_CSUM;
1788 sk->sk_gso_max_size = dst->dev->gso_max_size;
1789 max_segs = max_t(u32, dst->dev->gso_max_segs, 1);
1790 }
1791 }
1792 sk->sk_gso_max_segs = max_segs;
1793}
1794EXPORT_SYMBOL_GPL(sk_setup_caps);
1795
1796/*
1797 * Simple resource managers for sockets.
1798 */
1799
1800
1801/*
1802 * Write buffer destructor automatically called from kfree_skb.
1803 */
1804void sock_wfree(struct sk_buff *skb)
1805{
1806 struct sock *sk = skb->sk;
1807 unsigned int len = skb->truesize;
1808
1809 if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE)) {
1810 /*
1811 * Keep a reference on sk_wmem_alloc, this will be released
1812 * after sk_write_space() call
1813 */
1814 WARN_ON(refcount_sub_and_test(len - 1, &sk->sk_wmem_alloc));
1815 sk->sk_write_space(sk);
1816 len = 1;
1817 }
1818 /*
1819 * if sk_wmem_alloc reaches 0, we must finish what sk_free()
1820 * could not do because of in-flight packets
1821 */
1822 if (refcount_sub_and_test(len, &sk->sk_wmem_alloc))
1823 __sk_free(sk);
1824}
1825EXPORT_SYMBOL(sock_wfree);
1826
1827/* This variant of sock_wfree() is used by TCP,
1828 * since it sets SOCK_USE_WRITE_QUEUE.
1829 */
1830void __sock_wfree(struct sk_buff *skb)
1831{
1832 struct sock *sk = skb->sk;
1833
1834 if (refcount_sub_and_test(skb->truesize, &sk->sk_wmem_alloc))
1835 __sk_free(sk);
1836}
1837
1838void skb_set_owner_w(struct sk_buff *skb, struct sock *sk)
1839{
1840 skb_orphan(skb);
1841 skb->sk = sk;
1842#ifdef CONFIG_INET
1843 if (unlikely(!sk_fullsock(sk))) {
1844 skb->destructor = sock_edemux;
1845 sock_hold(sk);
1846 return;
1847 }
1848#endif
1849 skb->destructor = sock_wfree;
1850 skb_set_hash_from_sk(skb, sk);
1851 /*
1852 * We used to take a refcount on sk, but following operation
1853 * is enough to guarantee sk_free() wont free this sock until
1854 * all in-flight packets are completed
1855 */
1856 refcount_add(skb->truesize, &sk->sk_wmem_alloc);
1857}
1858EXPORT_SYMBOL(skb_set_owner_w);
1859
1860/* This helper is used by netem, as it can hold packets in its
1861 * delay queue. We want to allow the owner socket to send more
1862 * packets, as if they were already TX completed by a typical driver.
1863 * But we also want to keep skb->sk set because some packet schedulers
1864 * rely on it (sch_fq for example).
1865 */
1866void skb_orphan_partial(struct sk_buff *skb)
1867{
1868 if (skb_is_tcp_pure_ack(skb))
1869 return;
1870
1871 if (skb->destructor == sock_wfree
1872#ifdef CONFIG_INET
1873 || skb->destructor == tcp_wfree
1874#endif
1875 ) {
1876 struct sock *sk = skb->sk;
1877
1878 if (refcount_inc_not_zero(&sk->sk_refcnt)) {
1879 WARN_ON(refcount_sub_and_test(skb->truesize, &sk->sk_wmem_alloc));
1880 skb->destructor = sock_efree;
1881 }
1882 } else {
1883 skb_orphan(skb);
1884 }
1885}
1886EXPORT_SYMBOL(skb_orphan_partial);
1887
1888/*
1889 * Read buffer destructor automatically called from kfree_skb.
1890 */
1891void sock_rfree(struct sk_buff *skb)
1892{
1893 struct sock *sk = skb->sk;
1894 unsigned int len = skb->truesize;
1895
1896 atomic_sub(len, &sk->sk_rmem_alloc);
1897 sk_mem_uncharge(sk, len);
1898}
1899EXPORT_SYMBOL(sock_rfree);
1900
1901/*
1902 * Buffer destructor for skbs that are not used directly in read or write
1903 * path, e.g. for error handler skbs. Automatically called from kfree_skb.
1904 */
1905void sock_efree(struct sk_buff *skb)
1906{
1907 sock_put(skb->sk);
1908}
1909EXPORT_SYMBOL(sock_efree);
1910
1911kuid_t sock_i_uid(struct sock *sk)
1912{
1913 kuid_t uid;
1914
1915 read_lock_bh(&sk->sk_callback_lock);
1916 uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : GLOBAL_ROOT_UID;
1917 read_unlock_bh(&sk->sk_callback_lock);
1918 return uid;
1919}
1920EXPORT_SYMBOL(sock_i_uid);
1921
1922unsigned long sock_i_ino(struct sock *sk)
1923{
1924 unsigned long ino;
1925
1926 read_lock_bh(&sk->sk_callback_lock);
1927 ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0;
1928 read_unlock_bh(&sk->sk_callback_lock);
1929 return ino;
1930}
1931EXPORT_SYMBOL(sock_i_ino);
1932
1933/*
1934 * Allocate a skb from the socket's send buffer.
1935 */
1936struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force,
1937 gfp_t priority)
1938{
1939 if (force || refcount_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
1940 struct sk_buff *skb = alloc_skb(size, priority);
1941 if (skb) {
1942 skb_set_owner_w(skb, sk);
1943 return skb;
1944 }
1945 }
1946 return NULL;
1947}
1948EXPORT_SYMBOL(sock_wmalloc);
1949
1950static void sock_ofree(struct sk_buff *skb)
1951{
1952 struct sock *sk = skb->sk;
1953
1954 atomic_sub(skb->truesize, &sk->sk_omem_alloc);
1955}
1956
1957struct sk_buff *sock_omalloc(struct sock *sk, unsigned long size,
1958 gfp_t priority)
1959{
1960 struct sk_buff *skb;
1961
1962 /* small safe race: SKB_TRUESIZE may differ from final skb->truesize */
1963 if (atomic_read(&sk->sk_omem_alloc) + SKB_TRUESIZE(size) >
1964 sysctl_optmem_max)
1965 return NULL;
1966
1967 skb = alloc_skb(size, priority);
1968 if (!skb)
1969 return NULL;
1970
1971 atomic_add(skb->truesize, &sk->sk_omem_alloc);
1972 skb->sk = sk;
1973 skb->destructor = sock_ofree;
1974 return skb;
1975}
1976
1977/*
1978 * Allocate a memory block from the socket's option memory buffer.
1979 */
1980void *sock_kmalloc(struct sock *sk, int size, gfp_t priority)
1981{
1982 if ((unsigned int)size <= sysctl_optmem_max &&
1983 atomic_read(&sk->sk_omem_alloc) + size < sysctl_optmem_max) {
1984 void *mem;
1985 /* First do the add, to avoid the race if kmalloc
1986 * might sleep.
1987 */
1988 atomic_add(size, &sk->sk_omem_alloc);
1989 mem = kmalloc(size, priority);
1990 if (mem)
1991 return mem;
1992 atomic_sub(size, &sk->sk_omem_alloc);
1993 }
1994 return NULL;
1995}
1996EXPORT_SYMBOL(sock_kmalloc);
1997
1998/* Free an option memory block. Note, we actually want the inline
1999 * here as this allows gcc to detect the nullify and fold away the
2000 * condition entirely.
2001 */
2002static inline void __sock_kfree_s(struct sock *sk, void *mem, int size,
2003 const bool nullify)
2004{
2005 if (WARN_ON_ONCE(!mem))
2006 return;
2007 if (nullify)
2008 kzfree(mem);
2009 else
2010 kfree(mem);
2011 atomic_sub(size, &sk->sk_omem_alloc);
2012}
2013
2014void sock_kfree_s(struct sock *sk, void *mem, int size)
2015{
2016 __sock_kfree_s(sk, mem, size, false);
2017}
2018EXPORT_SYMBOL(sock_kfree_s);
2019
2020void sock_kzfree_s(struct sock *sk, void *mem, int size)
2021{
2022 __sock_kfree_s(sk, mem, size, true);
2023}
2024EXPORT_SYMBOL(sock_kzfree_s);
2025
2026/* It is almost wait_for_tcp_memory minus release_sock/lock_sock.
2027 I think, these locks should be removed for datagram sockets.
2028 */
2029static long sock_wait_for_wmem(struct sock *sk, long timeo)
2030{
2031 DEFINE_WAIT(wait);
2032
2033 sk_clear_bit(SOCKWQ_ASYNC_NOSPACE, sk);
2034 for (;;) {
2035 if (!timeo)
2036 break;
2037 if (signal_pending(current))
2038 break;
2039 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
2040 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
2041 if (refcount_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf)
2042 break;
2043 if (sk->sk_shutdown & SEND_SHUTDOWN)
2044 break;
2045 if (sk->sk_err)
2046 break;
2047 timeo = schedule_timeout(timeo);
2048 }
2049 finish_wait(sk_sleep(sk), &wait);
2050 return timeo;
2051}
2052
2053
2054/*
2055 * Generic send/receive buffer handlers
2056 */
2057
2058struct sk_buff *sock_alloc_send_pskb(struct sock *sk, unsigned long header_len,
2059 unsigned long data_len, int noblock,
2060 int *errcode, int max_page_order)
2061{
2062 struct sk_buff *skb;
2063 long timeo;
2064 int err;
2065
2066 timeo = sock_sndtimeo(sk, noblock);
2067 for (;;) {
2068 err = sock_error(sk);
2069 if (err != 0)
2070 goto failure;
2071
2072 err = -EPIPE;
2073 if (sk->sk_shutdown & SEND_SHUTDOWN)
2074 goto failure;
2075
2076 if (sk_wmem_alloc_get(sk) < sk->sk_sndbuf)
2077 break;
2078
2079 sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk);
2080 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
2081 err = -EAGAIN;
2082 if (!timeo)
2083 goto failure;
2084 if (signal_pending(current))
2085 goto interrupted;
2086 timeo = sock_wait_for_wmem(sk, timeo);
2087 }
2088 skb = alloc_skb_with_frags(header_len, data_len, max_page_order,
2089 errcode, sk->sk_allocation);
2090 if (skb)
2091 skb_set_owner_w(skb, sk);
2092 return skb;
2093
2094interrupted:
2095 err = sock_intr_errno(timeo);
2096failure:
2097 *errcode = err;
2098 return NULL;
2099}
2100EXPORT_SYMBOL(sock_alloc_send_pskb);
2101
2102struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size,
2103 int noblock, int *errcode)
2104{
2105 return sock_alloc_send_pskb(sk, size, 0, noblock, errcode, 0);
2106}
2107EXPORT_SYMBOL(sock_alloc_send_skb);
2108
2109int __sock_cmsg_send(struct sock *sk, struct msghdr *msg, struct cmsghdr *cmsg,
2110 struct sockcm_cookie *sockc)
2111{
2112 u32 tsflags;
2113
2114 switch (cmsg->cmsg_type) {
2115 case SO_MARK:
2116 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
2117 return -EPERM;
2118 if (cmsg->cmsg_len != CMSG_LEN(sizeof(u32)))
2119 return -EINVAL;
2120 sockc->mark = *(u32 *)CMSG_DATA(cmsg);
2121 break;
2122 case SO_TIMESTAMPING:
2123 if (cmsg->cmsg_len != CMSG_LEN(sizeof(u32)))
2124 return -EINVAL;
2125
2126 tsflags = *(u32 *)CMSG_DATA(cmsg);
2127 if (tsflags & ~SOF_TIMESTAMPING_TX_RECORD_MASK)
2128 return -EINVAL;
2129
2130 sockc->tsflags &= ~SOF_TIMESTAMPING_TX_RECORD_MASK;
2131 sockc->tsflags |= tsflags;
2132 break;
2133 /* SCM_RIGHTS and SCM_CREDENTIALS are semantically in SOL_UNIX. */
2134 case SCM_RIGHTS:
2135 case SCM_CREDENTIALS:
2136 break;
2137 default:
2138 return -EINVAL;
2139 }
2140 return 0;
2141}
2142EXPORT_SYMBOL(__sock_cmsg_send);
2143
2144int sock_cmsg_send(struct sock *sk, struct msghdr *msg,
2145 struct sockcm_cookie *sockc)
2146{
2147 struct cmsghdr *cmsg;
2148 int ret;
2149
2150 for_each_cmsghdr(cmsg, msg) {
2151 if (!CMSG_OK(msg, cmsg))
2152 return -EINVAL;
2153 if (cmsg->cmsg_level != SOL_SOCKET)
2154 continue;
2155 ret = __sock_cmsg_send(sk, msg, cmsg, sockc);
2156 if (ret)
2157 return ret;
2158 }
2159 return 0;
2160}
2161EXPORT_SYMBOL(sock_cmsg_send);
2162
2163static void sk_enter_memory_pressure(struct sock *sk)
2164{
2165 if (!sk->sk_prot->enter_memory_pressure)
2166 return;
2167
2168 sk->sk_prot->enter_memory_pressure(sk);
2169}
2170
2171static void sk_leave_memory_pressure(struct sock *sk)
2172{
2173 if (sk->sk_prot->leave_memory_pressure) {
2174 sk->sk_prot->leave_memory_pressure(sk);
2175 } else {
2176 unsigned long *memory_pressure = sk->sk_prot->memory_pressure;
2177
2178 if (memory_pressure && *memory_pressure)
2179 *memory_pressure = 0;
2180 }
2181}
2182
2183/* On 32bit arches, an skb frag is limited to 2^15 */
2184#define SKB_FRAG_PAGE_ORDER get_order(32768)
2185
2186/**
2187 * skb_page_frag_refill - check that a page_frag contains enough room
2188 * @sz: minimum size of the fragment we want to get
2189 * @pfrag: pointer to page_frag
2190 * @gfp: priority for memory allocation
2191 *
2192 * Note: While this allocator tries to use high order pages, there is
2193 * no guarantee that allocations succeed. Therefore, @sz MUST be
2194 * less or equal than PAGE_SIZE.
2195 */
2196bool skb_page_frag_refill(unsigned int sz, struct page_frag *pfrag, gfp_t gfp)
2197{
2198 if (pfrag->page) {
2199 if (page_ref_count(pfrag->page) == 1) {
2200 pfrag->offset = 0;
2201 return true;
2202 }
2203 if (pfrag->offset + sz <= pfrag->size)
2204 return true;
2205 put_page(pfrag->page);
2206 }
2207
2208 pfrag->offset = 0;
2209 if (SKB_FRAG_PAGE_ORDER) {
2210 /* Avoid direct reclaim but allow kswapd to wake */
2211 pfrag->page = alloc_pages((gfp & ~__GFP_DIRECT_RECLAIM) |
2212 __GFP_COMP | __GFP_NOWARN |
2213 __GFP_NORETRY,
2214 SKB_FRAG_PAGE_ORDER);
2215 if (likely(pfrag->page)) {
2216 pfrag->size = PAGE_SIZE << SKB_FRAG_PAGE_ORDER;
2217 return true;
2218 }
2219 }
2220 pfrag->page = alloc_page(gfp);
2221 if (likely(pfrag->page)) {
2222 pfrag->size = PAGE_SIZE;
2223 return true;
2224 }
2225 return false;
2226}
2227EXPORT_SYMBOL(skb_page_frag_refill);
2228
2229bool sk_page_frag_refill(struct sock *sk, struct page_frag *pfrag)
2230{
2231 if (likely(skb_page_frag_refill(32U, pfrag, sk->sk_allocation)))
2232 return true;
2233
2234 sk_enter_memory_pressure(sk);
2235 sk_stream_moderate_sndbuf(sk);
2236 return false;
2237}
2238EXPORT_SYMBOL(sk_page_frag_refill);
2239
2240int sk_alloc_sg(struct sock *sk, int len, struct scatterlist *sg,
2241 int sg_start, int *sg_curr_index, unsigned int *sg_curr_size,
2242 int first_coalesce)
2243{
2244 int sg_curr = *sg_curr_index, use = 0, rc = 0;
2245 unsigned int size = *sg_curr_size;
2246 struct page_frag *pfrag;
2247 struct scatterlist *sge;
2248
2249 len -= size;
2250 pfrag = sk_page_frag(sk);
2251
2252 while (len > 0) {
2253 unsigned int orig_offset;
2254
2255 if (!sk_page_frag_refill(sk, pfrag)) {
2256 rc = -ENOMEM;
2257 goto out;
2258 }
2259
2260 use = min_t(int, len, pfrag->size - pfrag->offset);
2261
2262 if (!sk_wmem_schedule(sk, use)) {
2263 rc = -ENOMEM;
2264 goto out;
2265 }
2266
2267 sk_mem_charge(sk, use);
2268 size += use;
2269 orig_offset = pfrag->offset;
2270 pfrag->offset += use;
2271
2272 sge = sg + sg_curr - 1;
2273 if (sg_curr > first_coalesce && sg_page(sg) == pfrag->page &&
2274 sg->offset + sg->length == orig_offset) {
2275 sg->length += use;
2276 } else {
2277 sge = sg + sg_curr;
2278 sg_unmark_end(sge);
2279 sg_set_page(sge, pfrag->page, use, orig_offset);
2280 get_page(pfrag->page);
2281 sg_curr++;
2282
2283 if (sg_curr == MAX_SKB_FRAGS)
2284 sg_curr = 0;
2285
2286 if (sg_curr == sg_start) {
2287 rc = -ENOSPC;
2288 break;
2289 }
2290 }
2291
2292 len -= use;
2293 }
2294out:
2295 *sg_curr_size = size;
2296 *sg_curr_index = sg_curr;
2297 return rc;
2298}
2299EXPORT_SYMBOL(sk_alloc_sg);
2300
2301static void __lock_sock(struct sock *sk)
2302 __releases(&sk->sk_lock.slock)
2303 __acquires(&sk->sk_lock.slock)
2304{
2305 DEFINE_WAIT(wait);
2306
2307 for (;;) {
2308 prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait,
2309 TASK_UNINTERRUPTIBLE);
2310 spin_unlock_bh(&sk->sk_lock.slock);
2311 schedule();
2312 spin_lock_bh(&sk->sk_lock.slock);
2313 if (!sock_owned_by_user(sk))
2314 break;
2315 }
2316 finish_wait(&sk->sk_lock.wq, &wait);
2317}
2318
2319static void __release_sock(struct sock *sk)
2320 __releases(&sk->sk_lock.slock)
2321 __acquires(&sk->sk_lock.slock)
2322{
2323 struct sk_buff *skb, *next;
2324
2325 while ((skb = sk->sk_backlog.head) != NULL) {
2326 sk->sk_backlog.head = sk->sk_backlog.tail = NULL;
2327
2328 spin_unlock_bh(&sk->sk_lock.slock);
2329
2330 do {
2331 next = skb->next;
2332 prefetch(next);
2333 WARN_ON_ONCE(skb_dst_is_noref(skb));
2334 skb->next = NULL;
2335 sk_backlog_rcv(sk, skb);
2336
2337 cond_resched();
2338
2339 skb = next;
2340 } while (skb != NULL);
2341
2342 spin_lock_bh(&sk->sk_lock.slock);
2343 }
2344
2345 /*
2346 * Doing the zeroing here guarantee we can not loop forever
2347 * while a wild producer attempts to flood us.
2348 */
2349 sk->sk_backlog.len = 0;
2350}
2351
2352void __sk_flush_backlog(struct sock *sk)
2353{
2354 spin_lock_bh(&sk->sk_lock.slock);
2355 __release_sock(sk);
2356 spin_unlock_bh(&sk->sk_lock.slock);
2357}
2358
2359/**
2360 * sk_wait_data - wait for data to arrive at sk_receive_queue
2361 * @sk: sock to wait on
2362 * @timeo: for how long
2363 * @skb: last skb seen on sk_receive_queue
2364 *
2365 * Now socket state including sk->sk_err is changed only under lock,
2366 * hence we may omit checks after joining wait queue.
2367 * We check receive queue before schedule() only as optimization;
2368 * it is very likely that release_sock() added new data.
2369 */
2370int sk_wait_data(struct sock *sk, long *timeo, const struct sk_buff *skb)
2371{
2372 DEFINE_WAIT_FUNC(wait, woken_wake_function);
2373 int rc;
2374
2375 add_wait_queue(sk_sleep(sk), &wait);
2376 sk_set_bit(SOCKWQ_ASYNC_WAITDATA, sk);
2377 rc = sk_wait_event(sk, timeo, skb_peek_tail(&sk->sk_receive_queue) != skb, &wait);
2378 sk_clear_bit(SOCKWQ_ASYNC_WAITDATA, sk);
2379 remove_wait_queue(sk_sleep(sk), &wait);
2380 return rc;
2381}
2382EXPORT_SYMBOL(sk_wait_data);
2383
2384/**
2385 * __sk_mem_raise_allocated - increase memory_allocated
2386 * @sk: socket
2387 * @size: memory size to allocate
2388 * @amt: pages to allocate
2389 * @kind: allocation type
2390 *
2391 * Similar to __sk_mem_schedule(), but does not update sk_forward_alloc
2392 */
2393int __sk_mem_raise_allocated(struct sock *sk, int size, int amt, int kind)
2394{
2395 struct proto *prot = sk->sk_prot;
2396 long allocated = sk_memory_allocated_add(sk, amt);
2397
2398 if (mem_cgroup_sockets_enabled && sk->sk_memcg &&
2399 !mem_cgroup_charge_skmem(sk->sk_memcg, amt))
2400 goto suppress_allocation;
2401
2402 /* Under limit. */
2403 if (allocated <= sk_prot_mem_limits(sk, 0)) {
2404 sk_leave_memory_pressure(sk);
2405 return 1;
2406 }
2407
2408 /* Under pressure. */
2409 if (allocated > sk_prot_mem_limits(sk, 1))
2410 sk_enter_memory_pressure(sk);
2411
2412 /* Over hard limit. */
2413 if (allocated > sk_prot_mem_limits(sk, 2))
2414 goto suppress_allocation;
2415
2416 /* guarantee minimum buffer size under pressure */
2417 if (kind == SK_MEM_RECV) {
2418 if (atomic_read(&sk->sk_rmem_alloc) < sk_get_rmem0(sk, prot))
2419 return 1;
2420
2421 } else { /* SK_MEM_SEND */
2422 int wmem0 = sk_get_wmem0(sk, prot);
2423
2424 if (sk->sk_type == SOCK_STREAM) {
2425 if (sk->sk_wmem_queued < wmem0)
2426 return 1;
2427 } else if (refcount_read(&sk->sk_wmem_alloc) < wmem0) {
2428 return 1;
2429 }
2430 }
2431
2432 if (sk_has_memory_pressure(sk)) {
2433 int alloc;
2434
2435 if (!sk_under_memory_pressure(sk))
2436 return 1;
2437 alloc = sk_sockets_allocated_read_positive(sk);
2438 if (sk_prot_mem_limits(sk, 2) > alloc *
2439 sk_mem_pages(sk->sk_wmem_queued +
2440 atomic_read(&sk->sk_rmem_alloc) +
2441 sk->sk_forward_alloc))
2442 return 1;
2443 }
2444
2445suppress_allocation:
2446
2447 if (kind == SK_MEM_SEND && sk->sk_type == SOCK_STREAM) {
2448 sk_stream_moderate_sndbuf(sk);
2449
2450 /* Fail only if socket is _under_ its sndbuf.
2451 * In this case we cannot block, so that we have to fail.
2452 */
2453 if (sk->sk_wmem_queued + size >= sk->sk_sndbuf)
2454 return 1;
2455 }
2456
2457 trace_sock_exceed_buf_limit(sk, prot, allocated);
2458
2459 sk_memory_allocated_sub(sk, amt);
2460
2461 if (mem_cgroup_sockets_enabled && sk->sk_memcg)
2462 mem_cgroup_uncharge_skmem(sk->sk_memcg, amt);
2463
2464 return 0;
2465}
2466EXPORT_SYMBOL(__sk_mem_raise_allocated);
2467
2468/**
2469 * __sk_mem_schedule - increase sk_forward_alloc and memory_allocated
2470 * @sk: socket
2471 * @size: memory size to allocate
2472 * @kind: allocation type
2473 *
2474 * If kind is SK_MEM_SEND, it means wmem allocation. Otherwise it means
2475 * rmem allocation. This function assumes that protocols which have
2476 * memory_pressure use sk_wmem_queued as write buffer accounting.
2477 */
2478int __sk_mem_schedule(struct sock *sk, int size, int kind)
2479{
2480 int ret, amt = sk_mem_pages(size);
2481
2482 sk->sk_forward_alloc += amt << SK_MEM_QUANTUM_SHIFT;
2483 ret = __sk_mem_raise_allocated(sk, size, amt, kind);
2484 if (!ret)
2485 sk->sk_forward_alloc -= amt << SK_MEM_QUANTUM_SHIFT;
2486 return ret;
2487}
2488EXPORT_SYMBOL(__sk_mem_schedule);
2489
2490/**
2491 * __sk_mem_reduce_allocated - reclaim memory_allocated
2492 * @sk: socket
2493 * @amount: number of quanta
2494 *
2495 * Similar to __sk_mem_reclaim(), but does not update sk_forward_alloc
2496 */
2497void __sk_mem_reduce_allocated(struct sock *sk, int amount)
2498{
2499 sk_memory_allocated_sub(sk, amount);
2500
2501 if (mem_cgroup_sockets_enabled && sk->sk_memcg)
2502 mem_cgroup_uncharge_skmem(sk->sk_memcg, amount);
2503
2504 if (sk_under_memory_pressure(sk) &&
2505 (sk_memory_allocated(sk) < sk_prot_mem_limits(sk, 0)))
2506 sk_leave_memory_pressure(sk);
2507}
2508EXPORT_SYMBOL(__sk_mem_reduce_allocated);
2509
2510/**
2511 * __sk_mem_reclaim - reclaim sk_forward_alloc and memory_allocated
2512 * @sk: socket
2513 * @amount: number of bytes (rounded down to a SK_MEM_QUANTUM multiple)
2514 */
2515void __sk_mem_reclaim(struct sock *sk, int amount)
2516{
2517 amount >>= SK_MEM_QUANTUM_SHIFT;
2518 sk->sk_forward_alloc -= amount << SK_MEM_QUANTUM_SHIFT;
2519 __sk_mem_reduce_allocated(sk, amount);
2520}
2521EXPORT_SYMBOL(__sk_mem_reclaim);
2522
2523int sk_set_peek_off(struct sock *sk, int val)
2524{
2525 sk->sk_peek_off = val;
2526 return 0;
2527}
2528EXPORT_SYMBOL_GPL(sk_set_peek_off);
2529
2530/*
2531 * Set of default routines for initialising struct proto_ops when
2532 * the protocol does not support a particular function. In certain
2533 * cases where it makes no sense for a protocol to have a "do nothing"
2534 * function, some default processing is provided.
2535 */
2536
2537int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len)
2538{
2539 return -EOPNOTSUPP;
2540}
2541EXPORT_SYMBOL(sock_no_bind);
2542
2543int sock_no_connect(struct socket *sock, struct sockaddr *saddr,
2544 int len, int flags)
2545{
2546 return -EOPNOTSUPP;
2547}
2548EXPORT_SYMBOL(sock_no_connect);
2549
2550int sock_no_socketpair(struct socket *sock1, struct socket *sock2)
2551{
2552 return -EOPNOTSUPP;
2553}
2554EXPORT_SYMBOL(sock_no_socketpair);
2555
2556int sock_no_accept(struct socket *sock, struct socket *newsock, int flags,
2557 bool kern)
2558{
2559 return -EOPNOTSUPP;
2560}
2561EXPORT_SYMBOL(sock_no_accept);
2562
2563int sock_no_getname(struct socket *sock, struct sockaddr *saddr,
2564 int peer)
2565{
2566 return -EOPNOTSUPP;
2567}
2568EXPORT_SYMBOL(sock_no_getname);
2569
2570__poll_t sock_no_poll(struct file *file, struct socket *sock, poll_table *pt)
2571{
2572 return 0;
2573}
2574EXPORT_SYMBOL(sock_no_poll);
2575
2576int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
2577{
2578 return -EOPNOTSUPP;
2579}
2580EXPORT_SYMBOL(sock_no_ioctl);
2581
2582int sock_no_listen(struct socket *sock, int backlog)
2583{
2584 return -EOPNOTSUPP;
2585}
2586EXPORT_SYMBOL(sock_no_listen);
2587
2588int sock_no_shutdown(struct socket *sock, int how)
2589{
2590 return -EOPNOTSUPP;
2591}
2592EXPORT_SYMBOL(sock_no_shutdown);
2593
2594int sock_no_setsockopt(struct socket *sock, int level, int optname,
2595 char __user *optval, unsigned int optlen)
2596{
2597 return -EOPNOTSUPP;
2598}
2599EXPORT_SYMBOL(sock_no_setsockopt);
2600
2601int sock_no_getsockopt(struct socket *sock, int level, int optname,
2602 char __user *optval, int __user *optlen)
2603{
2604 return -EOPNOTSUPP;
2605}
2606EXPORT_SYMBOL(sock_no_getsockopt);
2607
2608int sock_no_sendmsg(struct socket *sock, struct msghdr *m, size_t len)
2609{
2610 return -EOPNOTSUPP;
2611}
2612EXPORT_SYMBOL(sock_no_sendmsg);
2613
2614int sock_no_sendmsg_locked(struct sock *sk, struct msghdr *m, size_t len)
2615{
2616 return -EOPNOTSUPP;
2617}
2618EXPORT_SYMBOL(sock_no_sendmsg_locked);
2619
2620int sock_no_recvmsg(struct socket *sock, struct msghdr *m, size_t len,
2621 int flags)
2622{
2623 return -EOPNOTSUPP;
2624}
2625EXPORT_SYMBOL(sock_no_recvmsg);
2626
2627int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma)
2628{
2629 /* Mirror missing mmap method error code */
2630 return -ENODEV;
2631}
2632EXPORT_SYMBOL(sock_no_mmap);
2633
2634ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags)
2635{
2636 ssize_t res;
2637 struct msghdr msg = {.msg_flags = flags};
2638 struct kvec iov;
2639 char *kaddr = kmap(page);
2640 iov.iov_base = kaddr + offset;
2641 iov.iov_len = size;
2642 res = kernel_sendmsg(sock, &msg, &iov, 1, size);
2643 kunmap(page);
2644 return res;
2645}
2646EXPORT_SYMBOL(sock_no_sendpage);
2647
2648ssize_t sock_no_sendpage_locked(struct sock *sk, struct page *page,
2649 int offset, size_t size, int flags)
2650{
2651 ssize_t res;
2652 struct msghdr msg = {.msg_flags = flags};
2653 struct kvec iov;
2654 char *kaddr = kmap(page);
2655
2656 iov.iov_base = kaddr + offset;
2657 iov.iov_len = size;
2658 res = kernel_sendmsg_locked(sk, &msg, &iov, 1, size);
2659 kunmap(page);
2660 return res;
2661}
2662EXPORT_SYMBOL(sock_no_sendpage_locked);
2663
2664/*
2665 * Default Socket Callbacks
2666 */
2667
2668static void sock_def_wakeup(struct sock *sk)
2669{
2670 struct socket_wq *wq;
2671
2672 rcu_read_lock();
2673 wq = rcu_dereference(sk->sk_wq);
2674 if (skwq_has_sleeper(wq))
2675 wake_up_interruptible_all(&wq->wait);
2676 rcu_read_unlock();
2677}
2678
2679static void sock_def_error_report(struct sock *sk)
2680{
2681 struct socket_wq *wq;
2682
2683 rcu_read_lock();
2684 wq = rcu_dereference(sk->sk_wq);
2685 if (skwq_has_sleeper(wq))
2686 wake_up_interruptible_poll(&wq->wait, EPOLLERR);
2687 sk_wake_async(sk, SOCK_WAKE_IO, POLL_ERR);
2688 rcu_read_unlock();
2689}
2690
2691static void sock_def_readable(struct sock *sk)
2692{
2693 struct socket_wq *wq;
2694
2695 rcu_read_lock();
2696 wq = rcu_dereference(sk->sk_wq);
2697 if (skwq_has_sleeper(wq))
2698 wake_up_interruptible_sync_poll(&wq->wait, EPOLLIN | EPOLLPRI |
2699 EPOLLRDNORM | EPOLLRDBAND);
2700 sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN);
2701 rcu_read_unlock();
2702}
2703
2704static void sock_def_write_space(struct sock *sk)
2705{
2706 struct socket_wq *wq;
2707
2708 rcu_read_lock();
2709
2710 /* Do not wake up a writer until he can make "significant"
2711 * progress. --DaveM
2712 */
2713 if ((refcount_read(&sk->sk_wmem_alloc) << 1) <= sk->sk_sndbuf) {
2714 wq = rcu_dereference(sk->sk_wq);
2715 if (skwq_has_sleeper(wq))
2716 wake_up_interruptible_sync_poll(&wq->wait, EPOLLOUT |
2717 EPOLLWRNORM | EPOLLWRBAND);
2718
2719 /* Should agree with poll, otherwise some programs break */
2720 if (sock_writeable(sk))
2721 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
2722 }
2723
2724 rcu_read_unlock();
2725}
2726
2727static void sock_def_destruct(struct sock *sk)
2728{
2729}
2730
2731void sk_send_sigurg(struct sock *sk)
2732{
2733 if (sk->sk_socket && sk->sk_socket->file)
2734 if (send_sigurg(&sk->sk_socket->file->f_owner))
2735 sk_wake_async(sk, SOCK_WAKE_URG, POLL_PRI);
2736}
2737EXPORT_SYMBOL(sk_send_sigurg);
2738
2739void sk_reset_timer(struct sock *sk, struct timer_list* timer,
2740 unsigned long expires)
2741{
2742 if (!mod_timer(timer, expires))
2743 sock_hold(sk);
2744}
2745EXPORT_SYMBOL(sk_reset_timer);
2746
2747void sk_stop_timer(struct sock *sk, struct timer_list* timer)
2748{
2749 if (del_timer(timer))
2750 __sock_put(sk);
2751}
2752EXPORT_SYMBOL(sk_stop_timer);
2753
2754void sock_init_data(struct socket *sock, struct sock *sk)
2755{
2756 sk_init_common(sk);
2757 sk->sk_send_head = NULL;
2758
2759 timer_setup(&sk->sk_timer, NULL, 0);
2760
2761 sk->sk_allocation = GFP_KERNEL;
2762 sk->sk_rcvbuf = sysctl_rmem_default;
2763 sk->sk_sndbuf = sysctl_wmem_default;
2764 sk->sk_state = TCP_CLOSE;
2765 sk_set_socket(sk, sock);
2766
2767 sock_set_flag(sk, SOCK_ZAPPED);
2768
2769 if (sock) {
2770 sk->sk_type = sock->type;
2771 sk->sk_wq = sock->wq;
2772 sock->sk = sk;
2773 sk->sk_uid = SOCK_INODE(sock)->i_uid;
2774 } else {
2775 sk->sk_wq = NULL;
2776 sk->sk_uid = make_kuid(sock_net(sk)->user_ns, 0);
2777 }
2778
2779 rwlock_init(&sk->sk_callback_lock);
2780 if (sk->sk_kern_sock)
2781 lockdep_set_class_and_name(
2782 &sk->sk_callback_lock,
2783 af_kern_callback_keys + sk->sk_family,
2784 af_family_kern_clock_key_strings[sk->sk_family]);
2785 else
2786 lockdep_set_class_and_name(
2787 &sk->sk_callback_lock,
2788 af_callback_keys + sk->sk_family,
2789 af_family_clock_key_strings[sk->sk_family]);
2790
2791 sk->sk_state_change = sock_def_wakeup;
2792 sk->sk_data_ready = sock_def_readable;
2793 sk->sk_write_space = sock_def_write_space;
2794 sk->sk_error_report = sock_def_error_report;
2795 sk->sk_destruct = sock_def_destruct;
2796
2797 sk->sk_frag.page = NULL;
2798 sk->sk_frag.offset = 0;
2799 sk->sk_peek_off = -1;
2800
2801 sk->sk_peer_pid = NULL;
2802 sk->sk_peer_cred = NULL;
2803 sk->sk_write_pending = 0;
2804 sk->sk_rcvlowat = 1;
2805 sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT;
2806 sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT;
2807
2808 sk->sk_stamp = SK_DEFAULT_STAMP;
2809 atomic_set(&sk->sk_zckey, 0);
2810
2811#ifdef CONFIG_NET_RX_BUSY_POLL
2812 sk->sk_napi_id = 0;
2813 sk->sk_ll_usec = sysctl_net_busy_read;
2814#endif
2815
2816 sk->sk_max_pacing_rate = ~0U;
2817 sk->sk_pacing_rate = ~0U;
2818 sk->sk_pacing_shift = 10;
2819 sk->sk_incoming_cpu = -1;
2820 /*
2821 * Before updating sk_refcnt, we must commit prior changes to memory
2822 * (Documentation/RCU/rculist_nulls.txt for details)
2823 */
2824 smp_wmb();
2825 refcount_set(&sk->sk_refcnt, 1);
2826 atomic_set(&sk->sk_drops, 0);
2827}
2828EXPORT_SYMBOL(sock_init_data);
2829
2830void lock_sock_nested(struct sock *sk, int subclass)
2831{
2832 might_sleep();
2833 spin_lock_bh(&sk->sk_lock.slock);
2834 if (sk->sk_lock.owned)
2835 __lock_sock(sk);
2836 sk->sk_lock.owned = 1;
2837 spin_unlock(&sk->sk_lock.slock);
2838 /*
2839 * The sk_lock has mutex_lock() semantics here:
2840 */
2841 mutex_acquire(&sk->sk_lock.dep_map, subclass, 0, _RET_IP_);
2842 local_bh_enable();
2843}
2844EXPORT_SYMBOL(lock_sock_nested);
2845
2846void release_sock(struct sock *sk)
2847{
2848 spin_lock_bh(&sk->sk_lock.slock);
2849 if (sk->sk_backlog.tail)
2850 __release_sock(sk);
2851
2852 /* Warning : release_cb() might need to release sk ownership,
2853 * ie call sock_release_ownership(sk) before us.
2854 */
2855 if (sk->sk_prot->release_cb)
2856 sk->sk_prot->release_cb(sk);
2857
2858 sock_release_ownership(sk);
2859 if (waitqueue_active(&sk->sk_lock.wq))
2860 wake_up(&sk->sk_lock.wq);
2861 spin_unlock_bh(&sk->sk_lock.slock);
2862}
2863EXPORT_SYMBOL(release_sock);
2864
2865/**
2866 * lock_sock_fast - fast version of lock_sock
2867 * @sk: socket
2868 *
2869 * This version should be used for very small section, where process wont block
2870 * return false if fast path is taken:
2871 *
2872 * sk_lock.slock locked, owned = 0, BH disabled
2873 *
2874 * return true if slow path is taken:
2875 *
2876 * sk_lock.slock unlocked, owned = 1, BH enabled
2877 */
2878bool lock_sock_fast(struct sock *sk)
2879{
2880 might_sleep();
2881 spin_lock_bh(&sk->sk_lock.slock);
2882
2883 if (!sk->sk_lock.owned)
2884 /*
2885 * Note : We must disable BH
2886 */
2887 return false;
2888
2889 __lock_sock(sk);
2890 sk->sk_lock.owned = 1;
2891 spin_unlock(&sk->sk_lock.slock);
2892 /*
2893 * The sk_lock has mutex_lock() semantics here:
2894 */
2895 mutex_acquire(&sk->sk_lock.dep_map, 0, 0, _RET_IP_);
2896 local_bh_enable();
2897 return true;
2898}
2899EXPORT_SYMBOL(lock_sock_fast);
2900
2901int sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp)
2902{
2903 struct timeval tv;
2904 if (!sock_flag(sk, SOCK_TIMESTAMP))
2905 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
2906 tv = ktime_to_timeval(sk->sk_stamp);
2907 if (tv.tv_sec == -1)
2908 return -ENOENT;
2909 if (tv.tv_sec == 0) {
2910 sk->sk_stamp = ktime_get_real();
2911 tv = ktime_to_timeval(sk->sk_stamp);
2912 }
2913 return copy_to_user(userstamp, &tv, sizeof(tv)) ? -EFAULT : 0;
2914}
2915EXPORT_SYMBOL(sock_get_timestamp);
2916
2917int sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp)
2918{
2919 struct timespec ts;
2920 if (!sock_flag(sk, SOCK_TIMESTAMP))
2921 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
2922 ts = ktime_to_timespec(sk->sk_stamp);
2923 if (ts.tv_sec == -1)
2924 return -ENOENT;
2925 if (ts.tv_sec == 0) {
2926 sk->sk_stamp = ktime_get_real();
2927 ts = ktime_to_timespec(sk->sk_stamp);
2928 }
2929 return copy_to_user(userstamp, &ts, sizeof(ts)) ? -EFAULT : 0;
2930}
2931EXPORT_SYMBOL(sock_get_timestampns);
2932
2933void sock_enable_timestamp(struct sock *sk, int flag)
2934{
2935 if (!sock_flag(sk, flag)) {
2936 unsigned long previous_flags = sk->sk_flags;
2937
2938 sock_set_flag(sk, flag);
2939 /*
2940 * we just set one of the two flags which require net
2941 * time stamping, but time stamping might have been on
2942 * already because of the other one
2943 */
2944 if (sock_needs_netstamp(sk) &&
2945 !(previous_flags & SK_FLAGS_TIMESTAMP))
2946 net_enable_timestamp();
2947 }
2948}
2949
2950int sock_recv_errqueue(struct sock *sk, struct msghdr *msg, int len,
2951 int level, int type)
2952{
2953 struct sock_exterr_skb *serr;
2954 struct sk_buff *skb;
2955 int copied, err;
2956
2957 err = -EAGAIN;
2958 skb = sock_dequeue_err_skb(sk);
2959 if (skb == NULL)
2960 goto out;
2961
2962 copied = skb->len;
2963 if (copied > len) {
2964 msg->msg_flags |= MSG_TRUNC;
2965 copied = len;
2966 }
2967 err = skb_copy_datagram_msg(skb, 0, msg, copied);
2968 if (err)
2969 goto out_free_skb;
2970
2971 sock_recv_timestamp(msg, sk, skb);
2972
2973 serr = SKB_EXT_ERR(skb);
2974 put_cmsg(msg, level, type, sizeof(serr->ee), &serr->ee);
2975
2976 msg->msg_flags |= MSG_ERRQUEUE;
2977 err = copied;
2978
2979out_free_skb:
2980 kfree_skb(skb);
2981out:
2982 return err;
2983}
2984EXPORT_SYMBOL(sock_recv_errqueue);
2985
2986/*
2987 * Get a socket option on an socket.
2988 *
2989 * FIX: POSIX 1003.1g is very ambiguous here. It states that
2990 * asynchronous errors should be reported by getsockopt. We assume
2991 * this means if you specify SO_ERROR (otherwise whats the point of it).
2992 */
2993int sock_common_getsockopt(struct socket *sock, int level, int optname,
2994 char __user *optval, int __user *optlen)
2995{
2996 struct sock *sk = sock->sk;
2997
2998 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
2999}
3000EXPORT_SYMBOL(sock_common_getsockopt);
3001
3002#ifdef CONFIG_COMPAT
3003int compat_sock_common_getsockopt(struct socket *sock, int level, int optname,
3004 char __user *optval, int __user *optlen)
3005{
3006 struct sock *sk = sock->sk;
3007
3008 if (sk->sk_prot->compat_getsockopt != NULL)
3009 return sk->sk_prot->compat_getsockopt(sk, level, optname,
3010 optval, optlen);
3011 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
3012}
3013EXPORT_SYMBOL(compat_sock_common_getsockopt);
3014#endif
3015
3016int sock_common_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
3017 int flags)
3018{
3019 struct sock *sk = sock->sk;
3020 int addr_len = 0;
3021 int err;
3022
3023 err = sk->sk_prot->recvmsg(sk, msg, size, flags & MSG_DONTWAIT,
3024 flags & ~MSG_DONTWAIT, &addr_len);
3025 if (err >= 0)
3026 msg->msg_namelen = addr_len;
3027 return err;
3028}
3029EXPORT_SYMBOL(sock_common_recvmsg);
3030
3031/*
3032 * Set socket options on an inet socket.
3033 */
3034int sock_common_setsockopt(struct socket *sock, int level, int optname,
3035 char __user *optval, unsigned int optlen)
3036{
3037 struct sock *sk = sock->sk;
3038
3039 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
3040}
3041EXPORT_SYMBOL(sock_common_setsockopt);
3042
3043#ifdef CONFIG_COMPAT
3044int compat_sock_common_setsockopt(struct socket *sock, int level, int optname,
3045 char __user *optval, unsigned int optlen)
3046{
3047 struct sock *sk = sock->sk;
3048
3049 if (sk->sk_prot->compat_setsockopt != NULL)
3050 return sk->sk_prot->compat_setsockopt(sk, level, optname,
3051 optval, optlen);
3052 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
3053}
3054EXPORT_SYMBOL(compat_sock_common_setsockopt);
3055#endif
3056
3057void sk_common_release(struct sock *sk)
3058{
3059 if (sk->sk_prot->destroy)
3060 sk->sk_prot->destroy(sk);
3061
3062 /*
3063 * Observation: when sock_common_release is called, processes have
3064 * no access to socket. But net still has.
3065 * Step one, detach it from networking:
3066 *
3067 * A. Remove from hash tables.
3068 */
3069
3070 sk->sk_prot->unhash(sk);
3071
3072 /*
3073 * In this point socket cannot receive new packets, but it is possible
3074 * that some packets are in flight because some CPU runs receiver and
3075 * did hash table lookup before we unhashed socket. They will achieve
3076 * receive queue and will be purged by socket destructor.
3077 *
3078 * Also we still have packets pending on receive queue and probably,
3079 * our own packets waiting in device queues. sock_destroy will drain
3080 * receive queue, but transmitted packets will delay socket destruction
3081 * until the last reference will be released.
3082 */
3083
3084 sock_orphan(sk);
3085
3086 xfrm_sk_free_policy(sk);
3087
3088 sk_refcnt_debug_release(sk);
3089
3090 sock_put(sk);
3091}
3092EXPORT_SYMBOL(sk_common_release);
3093
3094void sk_get_meminfo(const struct sock *sk, u32 *mem)
3095{
3096 memset(mem, 0, sizeof(*mem) * SK_MEMINFO_VARS);
3097
3098 mem[SK_MEMINFO_RMEM_ALLOC] = sk_rmem_alloc_get(sk);
3099 mem[SK_MEMINFO_RCVBUF] = sk->sk_rcvbuf;
3100 mem[SK_MEMINFO_WMEM_ALLOC] = sk_wmem_alloc_get(sk);
3101 mem[SK_MEMINFO_SNDBUF] = sk->sk_sndbuf;
3102 mem[SK_MEMINFO_FWD_ALLOC] = sk->sk_forward_alloc;
3103 mem[SK_MEMINFO_WMEM_QUEUED] = sk->sk_wmem_queued;
3104 mem[SK_MEMINFO_OPTMEM] = atomic_read(&sk->sk_omem_alloc);
3105 mem[SK_MEMINFO_BACKLOG] = sk->sk_backlog.len;
3106 mem[SK_MEMINFO_DROPS] = atomic_read(&sk->sk_drops);
3107}
3108
3109#ifdef CONFIG_PROC_FS
3110#define PROTO_INUSE_NR 64 /* should be enough for the first time */
3111struct prot_inuse {
3112 int val[PROTO_INUSE_NR];
3113};
3114
3115static DECLARE_BITMAP(proto_inuse_idx, PROTO_INUSE_NR);
3116
3117void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
3118{
3119 __this_cpu_add(net->core.prot_inuse->val[prot->inuse_idx], val);
3120}
3121EXPORT_SYMBOL_GPL(sock_prot_inuse_add);
3122
3123int sock_prot_inuse_get(struct net *net, struct proto *prot)
3124{
3125 int cpu, idx = prot->inuse_idx;
3126 int res = 0;
3127
3128 for_each_possible_cpu(cpu)
3129 res += per_cpu_ptr(net->core.prot_inuse, cpu)->val[idx];
3130
3131 return res >= 0 ? res : 0;
3132}
3133EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
3134
3135static void sock_inuse_add(struct net *net, int val)
3136{
3137 this_cpu_add(*net->core.sock_inuse, val);
3138}
3139
3140int sock_inuse_get(struct net *net)
3141{
3142 int cpu, res = 0;
3143
3144 for_each_possible_cpu(cpu)
3145 res += *per_cpu_ptr(net->core.sock_inuse, cpu);
3146
3147 return res;
3148}
3149
3150EXPORT_SYMBOL_GPL(sock_inuse_get);
3151
3152static int __net_init sock_inuse_init_net(struct net *net)
3153{
3154 net->core.prot_inuse = alloc_percpu(struct prot_inuse);
3155 if (net->core.prot_inuse == NULL)
3156 return -ENOMEM;
3157
3158 net->core.sock_inuse = alloc_percpu(int);
3159 if (net->core.sock_inuse == NULL)
3160 goto out;
3161
3162 return 0;
3163
3164out:
3165 free_percpu(net->core.prot_inuse);
3166 return -ENOMEM;
3167}
3168
3169static void __net_exit sock_inuse_exit_net(struct net *net)
3170{
3171 free_percpu(net->core.prot_inuse);
3172 free_percpu(net->core.sock_inuse);
3173}
3174
3175static struct pernet_operations net_inuse_ops = {
3176 .init = sock_inuse_init_net,
3177 .exit = sock_inuse_exit_net,
3178};
3179
3180static __init int net_inuse_init(void)
3181{
3182 if (register_pernet_subsys(&net_inuse_ops))
3183 panic("Cannot initialize net inuse counters");
3184
3185 return 0;
3186}
3187
3188core_initcall(net_inuse_init);
3189
3190static void assign_proto_idx(struct proto *prot)
3191{
3192 prot->inuse_idx = find_first_zero_bit(proto_inuse_idx, PROTO_INUSE_NR);
3193
3194 if (unlikely(prot->inuse_idx == PROTO_INUSE_NR - 1)) {
3195 pr_err("PROTO_INUSE_NR exhausted\n");
3196 return;
3197 }
3198
3199 set_bit(prot->inuse_idx, proto_inuse_idx);
3200}
3201
3202static void release_proto_idx(struct proto *prot)
3203{
3204 if (prot->inuse_idx != PROTO_INUSE_NR - 1)
3205 clear_bit(prot->inuse_idx, proto_inuse_idx);
3206}
3207#else
3208static inline void assign_proto_idx(struct proto *prot)
3209{
3210}
3211
3212static inline void release_proto_idx(struct proto *prot)
3213{
3214}
3215
3216static void sock_inuse_add(struct net *net, int val)
3217{
3218}
3219#endif
3220
3221static void req_prot_cleanup(struct request_sock_ops *rsk_prot)
3222{
3223 if (!rsk_prot)
3224 return;
3225 kfree(rsk_prot->slab_name);
3226 rsk_prot->slab_name = NULL;
3227 kmem_cache_destroy(rsk_prot->slab);
3228 rsk_prot->slab = NULL;
3229}
3230
3231static int req_prot_init(const struct proto *prot)
3232{
3233 struct request_sock_ops *rsk_prot = prot->rsk_prot;
3234
3235 if (!rsk_prot)
3236 return 0;
3237
3238 rsk_prot->slab_name = kasprintf(GFP_KERNEL, "request_sock_%s",
3239 prot->name);
3240 if (!rsk_prot->slab_name)
3241 return -ENOMEM;
3242
3243 rsk_prot->slab = kmem_cache_create(rsk_prot->slab_name,
3244 rsk_prot->obj_size, 0,
3245 prot->slab_flags, NULL);
3246
3247 if (!rsk_prot->slab) {
3248 pr_crit("%s: Can't create request sock SLAB cache!\n",
3249 prot->name);
3250 return -ENOMEM;
3251 }
3252 return 0;
3253}
3254
3255int proto_register(struct proto *prot, int alloc_slab)
3256{
3257 if (alloc_slab) {
3258 prot->slab = kmem_cache_create_usercopy(prot->name,
3259 prot->obj_size, 0,
3260 SLAB_HWCACHE_ALIGN | prot->slab_flags,
3261 prot->useroffset, prot->usersize,
3262 NULL);
3263
3264 if (prot->slab == NULL) {
3265 pr_crit("%s: Can't create sock SLAB cache!\n",
3266 prot->name);
3267 goto out;
3268 }
3269
3270 if (req_prot_init(prot))
3271 goto out_free_request_sock_slab;
3272
3273 if (prot->twsk_prot != NULL) {
3274 prot->twsk_prot->twsk_slab_name = kasprintf(GFP_KERNEL, "tw_sock_%s", prot->name);
3275
3276 if (prot->twsk_prot->twsk_slab_name == NULL)
3277 goto out_free_request_sock_slab;
3278
3279 prot->twsk_prot->twsk_slab =
3280 kmem_cache_create(prot->twsk_prot->twsk_slab_name,
3281 prot->twsk_prot->twsk_obj_size,
3282 0,
3283 prot->slab_flags,
3284 NULL);
3285 if (prot->twsk_prot->twsk_slab == NULL)
3286 goto out_free_timewait_sock_slab_name;
3287 }
3288 }
3289
3290 mutex_lock(&proto_list_mutex);
3291 list_add(&prot->node, &proto_list);
3292 assign_proto_idx(prot);
3293 mutex_unlock(&proto_list_mutex);
3294 return 0;
3295
3296out_free_timewait_sock_slab_name:
3297 kfree(prot->twsk_prot->twsk_slab_name);
3298out_free_request_sock_slab:
3299 req_prot_cleanup(prot->rsk_prot);
3300
3301 kmem_cache_destroy(prot->slab);
3302 prot->slab = NULL;
3303out:
3304 return -ENOBUFS;
3305}
3306EXPORT_SYMBOL(proto_register);
3307
3308void proto_unregister(struct proto *prot)
3309{
3310 mutex_lock(&proto_list_mutex);
3311 release_proto_idx(prot);
3312 list_del(&prot->node);
3313 mutex_unlock(&proto_list_mutex);
3314
3315 kmem_cache_destroy(prot->slab);
3316 prot->slab = NULL;
3317
3318 req_prot_cleanup(prot->rsk_prot);
3319
3320 if (prot->twsk_prot != NULL && prot->twsk_prot->twsk_slab != NULL) {
3321 kmem_cache_destroy(prot->twsk_prot->twsk_slab);
3322 kfree(prot->twsk_prot->twsk_slab_name);
3323 prot->twsk_prot->twsk_slab = NULL;
3324 }
3325}
3326EXPORT_SYMBOL(proto_unregister);
3327
3328int sock_load_diag_module(int family, int protocol)
3329{
3330 if (!protocol) {
3331 if (!sock_is_registered(family))
3332 return -ENOENT;
3333
3334 return request_module("net-pf-%d-proto-%d-type-%d", PF_NETLINK,
3335 NETLINK_SOCK_DIAG, family);
3336 }
3337
3338#ifdef CONFIG_INET
3339 if (family == AF_INET &&
3340 !rcu_access_pointer(inet_protos[protocol]))
3341 return -ENOENT;
3342#endif
3343
3344 return request_module("net-pf-%d-proto-%d-type-%d-%d", PF_NETLINK,
3345 NETLINK_SOCK_DIAG, family, protocol);
3346}
3347EXPORT_SYMBOL(sock_load_diag_module);
3348
3349#ifdef CONFIG_PROC_FS
3350static void *proto_seq_start(struct seq_file *seq, loff_t *pos)
3351 __acquires(proto_list_mutex)
3352{
3353 mutex_lock(&proto_list_mutex);
3354 return seq_list_start_head(&proto_list, *pos);
3355}
3356
3357static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3358{
3359 return seq_list_next(v, &proto_list, pos);
3360}
3361
3362static void proto_seq_stop(struct seq_file *seq, void *v)
3363 __releases(proto_list_mutex)
3364{
3365 mutex_unlock(&proto_list_mutex);
3366}
3367
3368static char proto_method_implemented(const void *method)
3369{
3370 return method == NULL ? 'n' : 'y';
3371}
3372static long sock_prot_memory_allocated(struct proto *proto)
3373{
3374 return proto->memory_allocated != NULL ? proto_memory_allocated(proto) : -1L;
3375}
3376
3377static char *sock_prot_memory_pressure(struct proto *proto)
3378{
3379 return proto->memory_pressure != NULL ?
3380 proto_memory_pressure(proto) ? "yes" : "no" : "NI";
3381}
3382
3383static void proto_seq_printf(struct seq_file *seq, struct proto *proto)
3384{
3385
3386 seq_printf(seq, "%-9s %4u %6d %6ld %-3s %6u %-3s %-10s "
3387 "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n",
3388 proto->name,
3389 proto->obj_size,
3390 sock_prot_inuse_get(seq_file_net(seq), proto),
3391 sock_prot_memory_allocated(proto),
3392 sock_prot_memory_pressure(proto),
3393 proto->max_header,
3394 proto->slab == NULL ? "no" : "yes",
3395 module_name(proto->owner),
3396 proto_method_implemented(proto->close),
3397 proto_method_implemented(proto->connect),
3398 proto_method_implemented(proto->disconnect),
3399 proto_method_implemented(proto->accept),
3400 proto_method_implemented(proto->ioctl),
3401 proto_method_implemented(proto->init),
3402 proto_method_implemented(proto->destroy),
3403 proto_method_implemented(proto->shutdown),
3404 proto_method_implemented(proto->setsockopt),
3405 proto_method_implemented(proto->getsockopt),
3406 proto_method_implemented(proto->sendmsg),
3407 proto_method_implemented(proto->recvmsg),
3408 proto_method_implemented(proto->sendpage),
3409 proto_method_implemented(proto->bind),
3410 proto_method_implemented(proto->backlog_rcv),
3411 proto_method_implemented(proto->hash),
3412 proto_method_implemented(proto->unhash),
3413 proto_method_implemented(proto->get_port),
3414 proto_method_implemented(proto->enter_memory_pressure));
3415}
3416
3417static int proto_seq_show(struct seq_file *seq, void *v)
3418{
3419 if (v == &proto_list)
3420 seq_printf(seq, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s",
3421 "protocol",
3422 "size",
3423 "sockets",
3424 "memory",
3425 "press",
3426 "maxhdr",
3427 "slab",
3428 "module",
3429 "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n");
3430 else
3431 proto_seq_printf(seq, list_entry(v, struct proto, node));
3432 return 0;
3433}
3434
3435static const struct seq_operations proto_seq_ops = {
3436 .start = proto_seq_start,
3437 .next = proto_seq_next,
3438 .stop = proto_seq_stop,
3439 .show = proto_seq_show,
3440};
3441
3442static int proto_seq_open(struct inode *inode, struct file *file)
3443{
3444 return seq_open_net(inode, file, &proto_seq_ops,
3445 sizeof(struct seq_net_private));
3446}
3447
3448static const struct file_operations proto_seq_fops = {
3449 .open = proto_seq_open,
3450 .read = seq_read,
3451 .llseek = seq_lseek,
3452 .release = seq_release_net,
3453};
3454
3455static __net_init int proto_init_net(struct net *net)
3456{
3457 if (!proc_create("protocols", 0444, net->proc_net, &proto_seq_fops))
3458 return -ENOMEM;
3459
3460 return 0;
3461}
3462
3463static __net_exit void proto_exit_net(struct net *net)
3464{
3465 remove_proc_entry("protocols", net->proc_net);
3466}
3467
3468
3469static __net_initdata struct pernet_operations proto_net_ops = {
3470 .init = proto_init_net,
3471 .exit = proto_exit_net,
3472};
3473
3474static int __init proto_init(void)
3475{
3476 return register_pernet_subsys(&proto_net_ops);
3477}
3478
3479subsys_initcall(proto_init);
3480
3481#endif /* PROC_FS */
3482
3483#ifdef CONFIG_NET_RX_BUSY_POLL
3484bool sk_busy_loop_end(void *p, unsigned long start_time)
3485{
3486 struct sock *sk = p;
3487
3488 return !skb_queue_empty(&sk->sk_receive_queue) ||
3489 sk_busy_loop_timeout(sk, start_time);
3490}
3491EXPORT_SYMBOL(sk_busy_loop_end);
3492#endif /* CONFIG_NET_RX_BUSY_POLL */
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * INET An implementation of the TCP/IP protocol suite for the LINUX
4 * operating system. INET is implemented using the BSD Socket
5 * interface as the means of communication with the user level.
6 *
7 * Generic socket support routines. Memory allocators, socket lock/release
8 * handler for protocols to use and generic option handler.
9 *
10 * Authors: Ross Biro
11 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
12 * Florian La Roche, <flla@stud.uni-sb.de>
13 * Alan Cox, <A.Cox@swansea.ac.uk>
14 *
15 * Fixes:
16 * Alan Cox : Numerous verify_area() problems
17 * Alan Cox : Connecting on a connecting socket
18 * now returns an error for tcp.
19 * Alan Cox : sock->protocol is set correctly.
20 * and is not sometimes left as 0.
21 * Alan Cox : connect handles icmp errors on a
22 * connect properly. Unfortunately there
23 * is a restart syscall nasty there. I
24 * can't match BSD without hacking the C
25 * library. Ideas urgently sought!
26 * Alan Cox : Disallow bind() to addresses that are
27 * not ours - especially broadcast ones!!
28 * Alan Cox : Socket 1024 _IS_ ok for users. (fencepost)
29 * Alan Cox : sock_wfree/sock_rfree don't destroy sockets,
30 * instead they leave that for the DESTROY timer.
31 * Alan Cox : Clean up error flag in accept
32 * Alan Cox : TCP ack handling is buggy, the DESTROY timer
33 * was buggy. Put a remove_sock() in the handler
34 * for memory when we hit 0. Also altered the timer
35 * code. The ACK stuff can wait and needs major
36 * TCP layer surgery.
37 * Alan Cox : Fixed TCP ack bug, removed remove sock
38 * and fixed timer/inet_bh race.
39 * Alan Cox : Added zapped flag for TCP
40 * Alan Cox : Move kfree_skb into skbuff.c and tidied up surplus code
41 * Alan Cox : for new sk_buff allocations wmalloc/rmalloc now call alloc_skb
42 * Alan Cox : kfree_s calls now are kfree_skbmem so we can track skb resources
43 * Alan Cox : Supports socket option broadcast now as does udp. Packet and raw need fixing.
44 * Alan Cox : Added RCVBUF,SNDBUF size setting. It suddenly occurred to me how easy it was so...
45 * Rick Sladkey : Relaxed UDP rules for matching packets.
46 * C.E.Hawkins : IFF_PROMISC/SIOCGHWADDR support
47 * Pauline Middelink : identd support
48 * Alan Cox : Fixed connect() taking signals I think.
49 * Alan Cox : SO_LINGER supported
50 * Alan Cox : Error reporting fixes
51 * Anonymous : inet_create tidied up (sk->reuse setting)
52 * Alan Cox : inet sockets don't set sk->type!
53 * Alan Cox : Split socket option code
54 * Alan Cox : Callbacks
55 * Alan Cox : Nagle flag for Charles & Johannes stuff
56 * Alex : Removed restriction on inet fioctl
57 * Alan Cox : Splitting INET from NET core
58 * Alan Cox : Fixed bogus SO_TYPE handling in getsockopt()
59 * Adam Caldwell : Missing return in SO_DONTROUTE/SO_DEBUG code
60 * Alan Cox : Split IP from generic code
61 * Alan Cox : New kfree_skbmem()
62 * Alan Cox : Make SO_DEBUG superuser only.
63 * Alan Cox : Allow anyone to clear SO_DEBUG
64 * (compatibility fix)
65 * Alan Cox : Added optimistic memory grabbing for AF_UNIX throughput.
66 * Alan Cox : Allocator for a socket is settable.
67 * Alan Cox : SO_ERROR includes soft errors.
68 * Alan Cox : Allow NULL arguments on some SO_ opts
69 * Alan Cox : Generic socket allocation to make hooks
70 * easier (suggested by Craig Metz).
71 * Michael Pall : SO_ERROR returns positive errno again
72 * Steve Whitehouse: Added default destructor to free
73 * protocol private data.
74 * Steve Whitehouse: Added various other default routines
75 * common to several socket families.
76 * Chris Evans : Call suser() check last on F_SETOWN
77 * Jay Schulist : Added SO_ATTACH_FILTER and SO_DETACH_FILTER.
78 * Andi Kleen : Add sock_kmalloc()/sock_kfree_s()
79 * Andi Kleen : Fix write_space callback
80 * Chris Evans : Security fixes - signedness again
81 * Arnaldo C. Melo : cleanups, use skb_queue_purge
82 *
83 * To Fix:
84 */
85
86#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
87
88#include <asm/unaligned.h>
89#include <linux/capability.h>
90#include <linux/errno.h>
91#include <linux/errqueue.h>
92#include <linux/types.h>
93#include <linux/socket.h>
94#include <linux/in.h>
95#include <linux/kernel.h>
96#include <linux/module.h>
97#include <linux/proc_fs.h>
98#include <linux/seq_file.h>
99#include <linux/sched.h>
100#include <linux/sched/mm.h>
101#include <linux/timer.h>
102#include <linux/string.h>
103#include <linux/sockios.h>
104#include <linux/net.h>
105#include <linux/mm.h>
106#include <linux/slab.h>
107#include <linux/interrupt.h>
108#include <linux/poll.h>
109#include <linux/tcp.h>
110#include <linux/init.h>
111#include <linux/highmem.h>
112#include <linux/user_namespace.h>
113#include <linux/static_key.h>
114#include <linux/memcontrol.h>
115#include <linux/prefetch.h>
116
117#include <linux/uaccess.h>
118
119#include <linux/netdevice.h>
120#include <net/protocol.h>
121#include <linux/skbuff.h>
122#include <net/net_namespace.h>
123#include <net/request_sock.h>
124#include <net/sock.h>
125#include <linux/net_tstamp.h>
126#include <net/xfrm.h>
127#include <linux/ipsec.h>
128#include <net/cls_cgroup.h>
129#include <net/netprio_cgroup.h>
130#include <linux/sock_diag.h>
131
132#include <linux/filter.h>
133#include <net/sock_reuseport.h>
134#include <net/bpf_sk_storage.h>
135
136#include <trace/events/sock.h>
137
138#include <net/tcp.h>
139#include <net/busy_poll.h>
140
141static DEFINE_MUTEX(proto_list_mutex);
142static LIST_HEAD(proto_list);
143
144static void sock_inuse_add(struct net *net, int val);
145
146/**
147 * sk_ns_capable - General socket capability test
148 * @sk: Socket to use a capability on or through
149 * @user_ns: The user namespace of the capability to use
150 * @cap: The capability to use
151 *
152 * Test to see if the opener of the socket had when the socket was
153 * created and the current process has the capability @cap in the user
154 * namespace @user_ns.
155 */
156bool sk_ns_capable(const struct sock *sk,
157 struct user_namespace *user_ns, int cap)
158{
159 return file_ns_capable(sk->sk_socket->file, user_ns, cap) &&
160 ns_capable(user_ns, cap);
161}
162EXPORT_SYMBOL(sk_ns_capable);
163
164/**
165 * sk_capable - Socket global capability test
166 * @sk: Socket to use a capability on or through
167 * @cap: The global capability to use
168 *
169 * Test to see if the opener of the socket had when the socket was
170 * created and the current process has the capability @cap in all user
171 * namespaces.
172 */
173bool sk_capable(const struct sock *sk, int cap)
174{
175 return sk_ns_capable(sk, &init_user_ns, cap);
176}
177EXPORT_SYMBOL(sk_capable);
178
179/**
180 * sk_net_capable - Network namespace socket capability test
181 * @sk: Socket to use a capability on or through
182 * @cap: The capability to use
183 *
184 * Test to see if the opener of the socket had when the socket was created
185 * and the current process has the capability @cap over the network namespace
186 * the socket is a member of.
187 */
188bool sk_net_capable(const struct sock *sk, int cap)
189{
190 return sk_ns_capable(sk, sock_net(sk)->user_ns, cap);
191}
192EXPORT_SYMBOL(sk_net_capable);
193
194/*
195 * Each address family might have different locking rules, so we have
196 * one slock key per address family and separate keys for internal and
197 * userspace sockets.
198 */
199static struct lock_class_key af_family_keys[AF_MAX];
200static struct lock_class_key af_family_kern_keys[AF_MAX];
201static struct lock_class_key af_family_slock_keys[AF_MAX];
202static struct lock_class_key af_family_kern_slock_keys[AF_MAX];
203
204/*
205 * Make lock validator output more readable. (we pre-construct these
206 * strings build-time, so that runtime initialization of socket
207 * locks is fast):
208 */
209
210#define _sock_locks(x) \
211 x "AF_UNSPEC", x "AF_UNIX" , x "AF_INET" , \
212 x "AF_AX25" , x "AF_IPX" , x "AF_APPLETALK", \
213 x "AF_NETROM", x "AF_BRIDGE" , x "AF_ATMPVC" , \
214 x "AF_X25" , x "AF_INET6" , x "AF_ROSE" , \
215 x "AF_DECnet", x "AF_NETBEUI" , x "AF_SECURITY" , \
216 x "AF_KEY" , x "AF_NETLINK" , x "AF_PACKET" , \
217 x "AF_ASH" , x "AF_ECONET" , x "AF_ATMSVC" , \
218 x "AF_RDS" , x "AF_SNA" , x "AF_IRDA" , \
219 x "AF_PPPOX" , x "AF_WANPIPE" , x "AF_LLC" , \
220 x "27" , x "28" , x "AF_CAN" , \
221 x "AF_TIPC" , x "AF_BLUETOOTH", x "IUCV" , \
222 x "AF_RXRPC" , x "AF_ISDN" , x "AF_PHONET" , \
223 x "AF_IEEE802154", x "AF_CAIF" , x "AF_ALG" , \
224 x "AF_NFC" , x "AF_VSOCK" , x "AF_KCM" , \
225 x "AF_QIPCRTR", x "AF_SMC" , x "AF_XDP" , \
226 x "AF_MAX"
227
228static const char *const af_family_key_strings[AF_MAX+1] = {
229 _sock_locks("sk_lock-")
230};
231static const char *const af_family_slock_key_strings[AF_MAX+1] = {
232 _sock_locks("slock-")
233};
234static const char *const af_family_clock_key_strings[AF_MAX+1] = {
235 _sock_locks("clock-")
236};
237
238static const char *const af_family_kern_key_strings[AF_MAX+1] = {
239 _sock_locks("k-sk_lock-")
240};
241static const char *const af_family_kern_slock_key_strings[AF_MAX+1] = {
242 _sock_locks("k-slock-")
243};
244static const char *const af_family_kern_clock_key_strings[AF_MAX+1] = {
245 _sock_locks("k-clock-")
246};
247static const char *const af_family_rlock_key_strings[AF_MAX+1] = {
248 _sock_locks("rlock-")
249};
250static const char *const af_family_wlock_key_strings[AF_MAX+1] = {
251 _sock_locks("wlock-")
252};
253static const char *const af_family_elock_key_strings[AF_MAX+1] = {
254 _sock_locks("elock-")
255};
256
257/*
258 * sk_callback_lock and sk queues locking rules are per-address-family,
259 * so split the lock classes by using a per-AF key:
260 */
261static struct lock_class_key af_callback_keys[AF_MAX];
262static struct lock_class_key af_rlock_keys[AF_MAX];
263static struct lock_class_key af_wlock_keys[AF_MAX];
264static struct lock_class_key af_elock_keys[AF_MAX];
265static struct lock_class_key af_kern_callback_keys[AF_MAX];
266
267/* Run time adjustable parameters. */
268__u32 sysctl_wmem_max __read_mostly = SK_WMEM_MAX;
269EXPORT_SYMBOL(sysctl_wmem_max);
270__u32 sysctl_rmem_max __read_mostly = SK_RMEM_MAX;
271EXPORT_SYMBOL(sysctl_rmem_max);
272__u32 sysctl_wmem_default __read_mostly = SK_WMEM_MAX;
273__u32 sysctl_rmem_default __read_mostly = SK_RMEM_MAX;
274
275/* Maximal space eaten by iovec or ancillary data plus some space */
276int sysctl_optmem_max __read_mostly = sizeof(unsigned long)*(2*UIO_MAXIOV+512);
277EXPORT_SYMBOL(sysctl_optmem_max);
278
279int sysctl_tstamp_allow_data __read_mostly = 1;
280
281DEFINE_STATIC_KEY_FALSE(memalloc_socks_key);
282EXPORT_SYMBOL_GPL(memalloc_socks_key);
283
284/**
285 * sk_set_memalloc - sets %SOCK_MEMALLOC
286 * @sk: socket to set it on
287 *
288 * Set %SOCK_MEMALLOC on a socket for access to emergency reserves.
289 * It's the responsibility of the admin to adjust min_free_kbytes
290 * to meet the requirements
291 */
292void sk_set_memalloc(struct sock *sk)
293{
294 sock_set_flag(sk, SOCK_MEMALLOC);
295 sk->sk_allocation |= __GFP_MEMALLOC;
296 static_branch_inc(&memalloc_socks_key);
297}
298EXPORT_SYMBOL_GPL(sk_set_memalloc);
299
300void sk_clear_memalloc(struct sock *sk)
301{
302 sock_reset_flag(sk, SOCK_MEMALLOC);
303 sk->sk_allocation &= ~__GFP_MEMALLOC;
304 static_branch_dec(&memalloc_socks_key);
305
306 /*
307 * SOCK_MEMALLOC is allowed to ignore rmem limits to ensure forward
308 * progress of swapping. SOCK_MEMALLOC may be cleared while
309 * it has rmem allocations due to the last swapfile being deactivated
310 * but there is a risk that the socket is unusable due to exceeding
311 * the rmem limits. Reclaim the reserves and obey rmem limits again.
312 */
313 sk_mem_reclaim(sk);
314}
315EXPORT_SYMBOL_GPL(sk_clear_memalloc);
316
317int __sk_backlog_rcv(struct sock *sk, struct sk_buff *skb)
318{
319 int ret;
320 unsigned int noreclaim_flag;
321
322 /* these should have been dropped before queueing */
323 BUG_ON(!sock_flag(sk, SOCK_MEMALLOC));
324
325 noreclaim_flag = memalloc_noreclaim_save();
326 ret = sk->sk_backlog_rcv(sk, skb);
327 memalloc_noreclaim_restore(noreclaim_flag);
328
329 return ret;
330}
331EXPORT_SYMBOL(__sk_backlog_rcv);
332
333static int sock_get_timeout(long timeo, void *optval, bool old_timeval)
334{
335 struct __kernel_sock_timeval tv;
336 int size;
337
338 if (timeo == MAX_SCHEDULE_TIMEOUT) {
339 tv.tv_sec = 0;
340 tv.tv_usec = 0;
341 } else {
342 tv.tv_sec = timeo / HZ;
343 tv.tv_usec = ((timeo % HZ) * USEC_PER_SEC) / HZ;
344 }
345
346 if (old_timeval && in_compat_syscall() && !COMPAT_USE_64BIT_TIME) {
347 struct old_timeval32 tv32 = { tv.tv_sec, tv.tv_usec };
348 *(struct old_timeval32 *)optval = tv32;
349 return sizeof(tv32);
350 }
351
352 if (old_timeval) {
353 struct __kernel_old_timeval old_tv;
354 old_tv.tv_sec = tv.tv_sec;
355 old_tv.tv_usec = tv.tv_usec;
356 *(struct __kernel_old_timeval *)optval = old_tv;
357 size = sizeof(old_tv);
358 } else {
359 *(struct __kernel_sock_timeval *)optval = tv;
360 size = sizeof(tv);
361 }
362
363 return size;
364}
365
366static int sock_set_timeout(long *timeo_p, char __user *optval, int optlen, bool old_timeval)
367{
368 struct __kernel_sock_timeval tv;
369
370 if (old_timeval && in_compat_syscall() && !COMPAT_USE_64BIT_TIME) {
371 struct old_timeval32 tv32;
372
373 if (optlen < sizeof(tv32))
374 return -EINVAL;
375
376 if (copy_from_user(&tv32, optval, sizeof(tv32)))
377 return -EFAULT;
378 tv.tv_sec = tv32.tv_sec;
379 tv.tv_usec = tv32.tv_usec;
380 } else if (old_timeval) {
381 struct __kernel_old_timeval old_tv;
382
383 if (optlen < sizeof(old_tv))
384 return -EINVAL;
385 if (copy_from_user(&old_tv, optval, sizeof(old_tv)))
386 return -EFAULT;
387 tv.tv_sec = old_tv.tv_sec;
388 tv.tv_usec = old_tv.tv_usec;
389 } else {
390 if (optlen < sizeof(tv))
391 return -EINVAL;
392 if (copy_from_user(&tv, optval, sizeof(tv)))
393 return -EFAULT;
394 }
395 if (tv.tv_usec < 0 || tv.tv_usec >= USEC_PER_SEC)
396 return -EDOM;
397
398 if (tv.tv_sec < 0) {
399 static int warned __read_mostly;
400
401 *timeo_p = 0;
402 if (warned < 10 && net_ratelimit()) {
403 warned++;
404 pr_info("%s: `%s' (pid %d) tries to set negative timeout\n",
405 __func__, current->comm, task_pid_nr(current));
406 }
407 return 0;
408 }
409 *timeo_p = MAX_SCHEDULE_TIMEOUT;
410 if (tv.tv_sec == 0 && tv.tv_usec == 0)
411 return 0;
412 if (tv.tv_sec < (MAX_SCHEDULE_TIMEOUT / HZ - 1))
413 *timeo_p = tv.tv_sec * HZ + DIV_ROUND_UP((unsigned long)tv.tv_usec, USEC_PER_SEC / HZ);
414 return 0;
415}
416
417static void sock_warn_obsolete_bsdism(const char *name)
418{
419 static int warned;
420 static char warncomm[TASK_COMM_LEN];
421 if (strcmp(warncomm, current->comm) && warned < 5) {
422 strcpy(warncomm, current->comm);
423 pr_warn("process `%s' is using obsolete %s SO_BSDCOMPAT\n",
424 warncomm, name);
425 warned++;
426 }
427}
428
429static bool sock_needs_netstamp(const struct sock *sk)
430{
431 switch (sk->sk_family) {
432 case AF_UNSPEC:
433 case AF_UNIX:
434 return false;
435 default:
436 return true;
437 }
438}
439
440static void sock_disable_timestamp(struct sock *sk, unsigned long flags)
441{
442 if (sk->sk_flags & flags) {
443 sk->sk_flags &= ~flags;
444 if (sock_needs_netstamp(sk) &&
445 !(sk->sk_flags & SK_FLAGS_TIMESTAMP))
446 net_disable_timestamp();
447 }
448}
449
450
451int __sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
452{
453 unsigned long flags;
454 struct sk_buff_head *list = &sk->sk_receive_queue;
455
456 if (atomic_read(&sk->sk_rmem_alloc) >= sk->sk_rcvbuf) {
457 atomic_inc(&sk->sk_drops);
458 trace_sock_rcvqueue_full(sk, skb);
459 return -ENOMEM;
460 }
461
462 if (!sk_rmem_schedule(sk, skb, skb->truesize)) {
463 atomic_inc(&sk->sk_drops);
464 return -ENOBUFS;
465 }
466
467 skb->dev = NULL;
468 skb_set_owner_r(skb, sk);
469
470 /* we escape from rcu protected region, make sure we dont leak
471 * a norefcounted dst
472 */
473 skb_dst_force(skb);
474
475 spin_lock_irqsave(&list->lock, flags);
476 sock_skb_set_dropcount(sk, skb);
477 __skb_queue_tail(list, skb);
478 spin_unlock_irqrestore(&list->lock, flags);
479
480 if (!sock_flag(sk, SOCK_DEAD))
481 sk->sk_data_ready(sk);
482 return 0;
483}
484EXPORT_SYMBOL(__sock_queue_rcv_skb);
485
486int sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
487{
488 int err;
489
490 err = sk_filter(sk, skb);
491 if (err)
492 return err;
493
494 return __sock_queue_rcv_skb(sk, skb);
495}
496EXPORT_SYMBOL(sock_queue_rcv_skb);
497
498int __sk_receive_skb(struct sock *sk, struct sk_buff *skb,
499 const int nested, unsigned int trim_cap, bool refcounted)
500{
501 int rc = NET_RX_SUCCESS;
502
503 if (sk_filter_trim_cap(sk, skb, trim_cap))
504 goto discard_and_relse;
505
506 skb->dev = NULL;
507
508 if (sk_rcvqueues_full(sk, sk->sk_rcvbuf)) {
509 atomic_inc(&sk->sk_drops);
510 goto discard_and_relse;
511 }
512 if (nested)
513 bh_lock_sock_nested(sk);
514 else
515 bh_lock_sock(sk);
516 if (!sock_owned_by_user(sk)) {
517 /*
518 * trylock + unlock semantics:
519 */
520 mutex_acquire(&sk->sk_lock.dep_map, 0, 1, _RET_IP_);
521
522 rc = sk_backlog_rcv(sk, skb);
523
524 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_);
525 } else if (sk_add_backlog(sk, skb, READ_ONCE(sk->sk_rcvbuf))) {
526 bh_unlock_sock(sk);
527 atomic_inc(&sk->sk_drops);
528 goto discard_and_relse;
529 }
530
531 bh_unlock_sock(sk);
532out:
533 if (refcounted)
534 sock_put(sk);
535 return rc;
536discard_and_relse:
537 kfree_skb(skb);
538 goto out;
539}
540EXPORT_SYMBOL(__sk_receive_skb);
541
542struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie)
543{
544 struct dst_entry *dst = __sk_dst_get(sk);
545
546 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
547 sk_tx_queue_clear(sk);
548 sk->sk_dst_pending_confirm = 0;
549 RCU_INIT_POINTER(sk->sk_dst_cache, NULL);
550 dst_release(dst);
551 return NULL;
552 }
553
554 return dst;
555}
556EXPORT_SYMBOL(__sk_dst_check);
557
558struct dst_entry *sk_dst_check(struct sock *sk, u32 cookie)
559{
560 struct dst_entry *dst = sk_dst_get(sk);
561
562 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
563 sk_dst_reset(sk);
564 dst_release(dst);
565 return NULL;
566 }
567
568 return dst;
569}
570EXPORT_SYMBOL(sk_dst_check);
571
572static int sock_setbindtodevice_locked(struct sock *sk, int ifindex)
573{
574 int ret = -ENOPROTOOPT;
575#ifdef CONFIG_NETDEVICES
576 struct net *net = sock_net(sk);
577
578 /* Sorry... */
579 ret = -EPERM;
580 if (!ns_capable(net->user_ns, CAP_NET_RAW))
581 goto out;
582
583 ret = -EINVAL;
584 if (ifindex < 0)
585 goto out;
586
587 sk->sk_bound_dev_if = ifindex;
588 if (sk->sk_prot->rehash)
589 sk->sk_prot->rehash(sk);
590 sk_dst_reset(sk);
591
592 ret = 0;
593
594out:
595#endif
596
597 return ret;
598}
599
600static int sock_setbindtodevice(struct sock *sk, char __user *optval,
601 int optlen)
602{
603 int ret = -ENOPROTOOPT;
604#ifdef CONFIG_NETDEVICES
605 struct net *net = sock_net(sk);
606 char devname[IFNAMSIZ];
607 int index;
608
609 ret = -EINVAL;
610 if (optlen < 0)
611 goto out;
612
613 /* Bind this socket to a particular device like "eth0",
614 * as specified in the passed interface name. If the
615 * name is "" or the option length is zero the socket
616 * is not bound.
617 */
618 if (optlen > IFNAMSIZ - 1)
619 optlen = IFNAMSIZ - 1;
620 memset(devname, 0, sizeof(devname));
621
622 ret = -EFAULT;
623 if (copy_from_user(devname, optval, optlen))
624 goto out;
625
626 index = 0;
627 if (devname[0] != '\0') {
628 struct net_device *dev;
629
630 rcu_read_lock();
631 dev = dev_get_by_name_rcu(net, devname);
632 if (dev)
633 index = dev->ifindex;
634 rcu_read_unlock();
635 ret = -ENODEV;
636 if (!dev)
637 goto out;
638 }
639
640 lock_sock(sk);
641 ret = sock_setbindtodevice_locked(sk, index);
642 release_sock(sk);
643
644out:
645#endif
646
647 return ret;
648}
649
650static int sock_getbindtodevice(struct sock *sk, char __user *optval,
651 int __user *optlen, int len)
652{
653 int ret = -ENOPROTOOPT;
654#ifdef CONFIG_NETDEVICES
655 struct net *net = sock_net(sk);
656 char devname[IFNAMSIZ];
657
658 if (sk->sk_bound_dev_if == 0) {
659 len = 0;
660 goto zero;
661 }
662
663 ret = -EINVAL;
664 if (len < IFNAMSIZ)
665 goto out;
666
667 ret = netdev_get_name(net, devname, sk->sk_bound_dev_if);
668 if (ret)
669 goto out;
670
671 len = strlen(devname) + 1;
672
673 ret = -EFAULT;
674 if (copy_to_user(optval, devname, len))
675 goto out;
676
677zero:
678 ret = -EFAULT;
679 if (put_user(len, optlen))
680 goto out;
681
682 ret = 0;
683
684out:
685#endif
686
687 return ret;
688}
689
690static inline void sock_valbool_flag(struct sock *sk, int bit, int valbool)
691{
692 if (valbool)
693 sock_set_flag(sk, bit);
694 else
695 sock_reset_flag(sk, bit);
696}
697
698bool sk_mc_loop(struct sock *sk)
699{
700 if (dev_recursion_level())
701 return false;
702 if (!sk)
703 return true;
704 switch (sk->sk_family) {
705 case AF_INET:
706 return inet_sk(sk)->mc_loop;
707#if IS_ENABLED(CONFIG_IPV6)
708 case AF_INET6:
709 return inet6_sk(sk)->mc_loop;
710#endif
711 }
712 WARN_ON(1);
713 return true;
714}
715EXPORT_SYMBOL(sk_mc_loop);
716
717/*
718 * This is meant for all protocols to use and covers goings on
719 * at the socket level. Everything here is generic.
720 */
721
722int sock_setsockopt(struct socket *sock, int level, int optname,
723 char __user *optval, unsigned int optlen)
724{
725 struct sock_txtime sk_txtime;
726 struct sock *sk = sock->sk;
727 int val;
728 int valbool;
729 struct linger ling;
730 int ret = 0;
731
732 /*
733 * Options without arguments
734 */
735
736 if (optname == SO_BINDTODEVICE)
737 return sock_setbindtodevice(sk, optval, optlen);
738
739 if (optlen < sizeof(int))
740 return -EINVAL;
741
742 if (get_user(val, (int __user *)optval))
743 return -EFAULT;
744
745 valbool = val ? 1 : 0;
746
747 lock_sock(sk);
748
749 switch (optname) {
750 case SO_DEBUG:
751 if (val && !capable(CAP_NET_ADMIN))
752 ret = -EACCES;
753 else
754 sock_valbool_flag(sk, SOCK_DBG, valbool);
755 break;
756 case SO_REUSEADDR:
757 sk->sk_reuse = (valbool ? SK_CAN_REUSE : SK_NO_REUSE);
758 break;
759 case SO_REUSEPORT:
760 sk->sk_reuseport = valbool;
761 break;
762 case SO_TYPE:
763 case SO_PROTOCOL:
764 case SO_DOMAIN:
765 case SO_ERROR:
766 ret = -ENOPROTOOPT;
767 break;
768 case SO_DONTROUTE:
769 sock_valbool_flag(sk, SOCK_LOCALROUTE, valbool);
770 sk_dst_reset(sk);
771 break;
772 case SO_BROADCAST:
773 sock_valbool_flag(sk, SOCK_BROADCAST, valbool);
774 break;
775 case SO_SNDBUF:
776 /* Don't error on this BSD doesn't and if you think
777 * about it this is right. Otherwise apps have to
778 * play 'guess the biggest size' games. RCVBUF/SNDBUF
779 * are treated in BSD as hints
780 */
781 val = min_t(u32, val, sysctl_wmem_max);
782set_sndbuf:
783 /* Ensure val * 2 fits into an int, to prevent max_t()
784 * from treating it as a negative value.
785 */
786 val = min_t(int, val, INT_MAX / 2);
787 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
788 WRITE_ONCE(sk->sk_sndbuf,
789 max_t(int, val * 2, SOCK_MIN_SNDBUF));
790 /* Wake up sending tasks if we upped the value. */
791 sk->sk_write_space(sk);
792 break;
793
794 case SO_SNDBUFFORCE:
795 if (!capable(CAP_NET_ADMIN)) {
796 ret = -EPERM;
797 break;
798 }
799
800 /* No negative values (to prevent underflow, as val will be
801 * multiplied by 2).
802 */
803 if (val < 0)
804 val = 0;
805 goto set_sndbuf;
806
807 case SO_RCVBUF:
808 /* Don't error on this BSD doesn't and if you think
809 * about it this is right. Otherwise apps have to
810 * play 'guess the biggest size' games. RCVBUF/SNDBUF
811 * are treated in BSD as hints
812 */
813 val = min_t(u32, val, sysctl_rmem_max);
814set_rcvbuf:
815 /* Ensure val * 2 fits into an int, to prevent max_t()
816 * from treating it as a negative value.
817 */
818 val = min_t(int, val, INT_MAX / 2);
819 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
820 /*
821 * We double it on the way in to account for
822 * "struct sk_buff" etc. overhead. Applications
823 * assume that the SO_RCVBUF setting they make will
824 * allow that much actual data to be received on that
825 * socket.
826 *
827 * Applications are unaware that "struct sk_buff" and
828 * other overheads allocate from the receive buffer
829 * during socket buffer allocation.
830 *
831 * And after considering the possible alternatives,
832 * returning the value we actually used in getsockopt
833 * is the most desirable behavior.
834 */
835 WRITE_ONCE(sk->sk_rcvbuf,
836 max_t(int, val * 2, SOCK_MIN_RCVBUF));
837 break;
838
839 case SO_RCVBUFFORCE:
840 if (!capable(CAP_NET_ADMIN)) {
841 ret = -EPERM;
842 break;
843 }
844
845 /* No negative values (to prevent underflow, as val will be
846 * multiplied by 2).
847 */
848 if (val < 0)
849 val = 0;
850 goto set_rcvbuf;
851
852 case SO_KEEPALIVE:
853 if (sk->sk_prot->keepalive)
854 sk->sk_prot->keepalive(sk, valbool);
855 sock_valbool_flag(sk, SOCK_KEEPOPEN, valbool);
856 break;
857
858 case SO_OOBINLINE:
859 sock_valbool_flag(sk, SOCK_URGINLINE, valbool);
860 break;
861
862 case SO_NO_CHECK:
863 sk->sk_no_check_tx = valbool;
864 break;
865
866 case SO_PRIORITY:
867 if ((val >= 0 && val <= 6) ||
868 ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
869 sk->sk_priority = val;
870 else
871 ret = -EPERM;
872 break;
873
874 case SO_LINGER:
875 if (optlen < sizeof(ling)) {
876 ret = -EINVAL; /* 1003.1g */
877 break;
878 }
879 if (copy_from_user(&ling, optval, sizeof(ling))) {
880 ret = -EFAULT;
881 break;
882 }
883 if (!ling.l_onoff)
884 sock_reset_flag(sk, SOCK_LINGER);
885 else {
886#if (BITS_PER_LONG == 32)
887 if ((unsigned int)ling.l_linger >= MAX_SCHEDULE_TIMEOUT/HZ)
888 sk->sk_lingertime = MAX_SCHEDULE_TIMEOUT;
889 else
890#endif
891 sk->sk_lingertime = (unsigned int)ling.l_linger * HZ;
892 sock_set_flag(sk, SOCK_LINGER);
893 }
894 break;
895
896 case SO_BSDCOMPAT:
897 sock_warn_obsolete_bsdism("setsockopt");
898 break;
899
900 case SO_PASSCRED:
901 if (valbool)
902 set_bit(SOCK_PASSCRED, &sock->flags);
903 else
904 clear_bit(SOCK_PASSCRED, &sock->flags);
905 break;
906
907 case SO_TIMESTAMP_OLD:
908 case SO_TIMESTAMP_NEW:
909 case SO_TIMESTAMPNS_OLD:
910 case SO_TIMESTAMPNS_NEW:
911 if (valbool) {
912 if (optname == SO_TIMESTAMP_NEW || optname == SO_TIMESTAMPNS_NEW)
913 sock_set_flag(sk, SOCK_TSTAMP_NEW);
914 else
915 sock_reset_flag(sk, SOCK_TSTAMP_NEW);
916
917 if (optname == SO_TIMESTAMP_OLD || optname == SO_TIMESTAMP_NEW)
918 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
919 else
920 sock_set_flag(sk, SOCK_RCVTSTAMPNS);
921 sock_set_flag(sk, SOCK_RCVTSTAMP);
922 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
923 } else {
924 sock_reset_flag(sk, SOCK_RCVTSTAMP);
925 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
926 sock_reset_flag(sk, SOCK_TSTAMP_NEW);
927 }
928 break;
929
930 case SO_TIMESTAMPING_NEW:
931 sock_set_flag(sk, SOCK_TSTAMP_NEW);
932 /* fall through */
933 case SO_TIMESTAMPING_OLD:
934 if (val & ~SOF_TIMESTAMPING_MASK) {
935 ret = -EINVAL;
936 break;
937 }
938
939 if (val & SOF_TIMESTAMPING_OPT_ID &&
940 !(sk->sk_tsflags & SOF_TIMESTAMPING_OPT_ID)) {
941 if (sk->sk_protocol == IPPROTO_TCP &&
942 sk->sk_type == SOCK_STREAM) {
943 if ((1 << sk->sk_state) &
944 (TCPF_CLOSE | TCPF_LISTEN)) {
945 ret = -EINVAL;
946 break;
947 }
948 sk->sk_tskey = tcp_sk(sk)->snd_una;
949 } else {
950 sk->sk_tskey = 0;
951 }
952 }
953
954 if (val & SOF_TIMESTAMPING_OPT_STATS &&
955 !(val & SOF_TIMESTAMPING_OPT_TSONLY)) {
956 ret = -EINVAL;
957 break;
958 }
959
960 sk->sk_tsflags = val;
961 if (val & SOF_TIMESTAMPING_RX_SOFTWARE)
962 sock_enable_timestamp(sk,
963 SOCK_TIMESTAMPING_RX_SOFTWARE);
964 else {
965 if (optname == SO_TIMESTAMPING_NEW)
966 sock_reset_flag(sk, SOCK_TSTAMP_NEW);
967
968 sock_disable_timestamp(sk,
969 (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE));
970 }
971 break;
972
973 case SO_RCVLOWAT:
974 if (val < 0)
975 val = INT_MAX;
976 if (sock->ops->set_rcvlowat)
977 ret = sock->ops->set_rcvlowat(sk, val);
978 else
979 WRITE_ONCE(sk->sk_rcvlowat, val ? : 1);
980 break;
981
982 case SO_RCVTIMEO_OLD:
983 case SO_RCVTIMEO_NEW:
984 ret = sock_set_timeout(&sk->sk_rcvtimeo, optval, optlen, optname == SO_RCVTIMEO_OLD);
985 break;
986
987 case SO_SNDTIMEO_OLD:
988 case SO_SNDTIMEO_NEW:
989 ret = sock_set_timeout(&sk->sk_sndtimeo, optval, optlen, optname == SO_SNDTIMEO_OLD);
990 break;
991
992 case SO_ATTACH_FILTER:
993 ret = -EINVAL;
994 if (optlen == sizeof(struct sock_fprog)) {
995 struct sock_fprog fprog;
996
997 ret = -EFAULT;
998 if (copy_from_user(&fprog, optval, sizeof(fprog)))
999 break;
1000
1001 ret = sk_attach_filter(&fprog, sk);
1002 }
1003 break;
1004
1005 case SO_ATTACH_BPF:
1006 ret = -EINVAL;
1007 if (optlen == sizeof(u32)) {
1008 u32 ufd;
1009
1010 ret = -EFAULT;
1011 if (copy_from_user(&ufd, optval, sizeof(ufd)))
1012 break;
1013
1014 ret = sk_attach_bpf(ufd, sk);
1015 }
1016 break;
1017
1018 case SO_ATTACH_REUSEPORT_CBPF:
1019 ret = -EINVAL;
1020 if (optlen == sizeof(struct sock_fprog)) {
1021 struct sock_fprog fprog;
1022
1023 ret = -EFAULT;
1024 if (copy_from_user(&fprog, optval, sizeof(fprog)))
1025 break;
1026
1027 ret = sk_reuseport_attach_filter(&fprog, sk);
1028 }
1029 break;
1030
1031 case SO_ATTACH_REUSEPORT_EBPF:
1032 ret = -EINVAL;
1033 if (optlen == sizeof(u32)) {
1034 u32 ufd;
1035
1036 ret = -EFAULT;
1037 if (copy_from_user(&ufd, optval, sizeof(ufd)))
1038 break;
1039
1040 ret = sk_reuseport_attach_bpf(ufd, sk);
1041 }
1042 break;
1043
1044 case SO_DETACH_REUSEPORT_BPF:
1045 ret = reuseport_detach_prog(sk);
1046 break;
1047
1048 case SO_DETACH_FILTER:
1049 ret = sk_detach_filter(sk);
1050 break;
1051
1052 case SO_LOCK_FILTER:
1053 if (sock_flag(sk, SOCK_FILTER_LOCKED) && !valbool)
1054 ret = -EPERM;
1055 else
1056 sock_valbool_flag(sk, SOCK_FILTER_LOCKED, valbool);
1057 break;
1058
1059 case SO_PASSSEC:
1060 if (valbool)
1061 set_bit(SOCK_PASSSEC, &sock->flags);
1062 else
1063 clear_bit(SOCK_PASSSEC, &sock->flags);
1064 break;
1065 case SO_MARK:
1066 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) {
1067 ret = -EPERM;
1068 } else if (val != sk->sk_mark) {
1069 sk->sk_mark = val;
1070 sk_dst_reset(sk);
1071 }
1072 break;
1073
1074 case SO_RXQ_OVFL:
1075 sock_valbool_flag(sk, SOCK_RXQ_OVFL, valbool);
1076 break;
1077
1078 case SO_WIFI_STATUS:
1079 sock_valbool_flag(sk, SOCK_WIFI_STATUS, valbool);
1080 break;
1081
1082 case SO_PEEK_OFF:
1083 if (sock->ops->set_peek_off)
1084 ret = sock->ops->set_peek_off(sk, val);
1085 else
1086 ret = -EOPNOTSUPP;
1087 break;
1088
1089 case SO_NOFCS:
1090 sock_valbool_flag(sk, SOCK_NOFCS, valbool);
1091 break;
1092
1093 case SO_SELECT_ERR_QUEUE:
1094 sock_valbool_flag(sk, SOCK_SELECT_ERR_QUEUE, valbool);
1095 break;
1096
1097#ifdef CONFIG_NET_RX_BUSY_POLL
1098 case SO_BUSY_POLL:
1099 /* allow unprivileged users to decrease the value */
1100 if ((val > sk->sk_ll_usec) && !capable(CAP_NET_ADMIN))
1101 ret = -EPERM;
1102 else {
1103 if (val < 0)
1104 ret = -EINVAL;
1105 else
1106 sk->sk_ll_usec = val;
1107 }
1108 break;
1109#endif
1110
1111 case SO_MAX_PACING_RATE:
1112 {
1113 unsigned long ulval = (val == ~0U) ? ~0UL : val;
1114
1115 if (sizeof(ulval) != sizeof(val) &&
1116 optlen >= sizeof(ulval) &&
1117 get_user(ulval, (unsigned long __user *)optval)) {
1118 ret = -EFAULT;
1119 break;
1120 }
1121 if (ulval != ~0UL)
1122 cmpxchg(&sk->sk_pacing_status,
1123 SK_PACING_NONE,
1124 SK_PACING_NEEDED);
1125 sk->sk_max_pacing_rate = ulval;
1126 sk->sk_pacing_rate = min(sk->sk_pacing_rate, ulval);
1127 break;
1128 }
1129 case SO_INCOMING_CPU:
1130 WRITE_ONCE(sk->sk_incoming_cpu, val);
1131 break;
1132
1133 case SO_CNX_ADVICE:
1134 if (val == 1)
1135 dst_negative_advice(sk);
1136 break;
1137
1138 case SO_ZEROCOPY:
1139 if (sk->sk_family == PF_INET || sk->sk_family == PF_INET6) {
1140 if (!((sk->sk_type == SOCK_STREAM &&
1141 sk->sk_protocol == IPPROTO_TCP) ||
1142 (sk->sk_type == SOCK_DGRAM &&
1143 sk->sk_protocol == IPPROTO_UDP)))
1144 ret = -ENOTSUPP;
1145 } else if (sk->sk_family != PF_RDS) {
1146 ret = -ENOTSUPP;
1147 }
1148 if (!ret) {
1149 if (val < 0 || val > 1)
1150 ret = -EINVAL;
1151 else
1152 sock_valbool_flag(sk, SOCK_ZEROCOPY, valbool);
1153 }
1154 break;
1155
1156 case SO_TXTIME:
1157 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) {
1158 ret = -EPERM;
1159 } else if (optlen != sizeof(struct sock_txtime)) {
1160 ret = -EINVAL;
1161 } else if (copy_from_user(&sk_txtime, optval,
1162 sizeof(struct sock_txtime))) {
1163 ret = -EFAULT;
1164 } else if (sk_txtime.flags & ~SOF_TXTIME_FLAGS_MASK) {
1165 ret = -EINVAL;
1166 } else {
1167 sock_valbool_flag(sk, SOCK_TXTIME, true);
1168 sk->sk_clockid = sk_txtime.clockid;
1169 sk->sk_txtime_deadline_mode =
1170 !!(sk_txtime.flags & SOF_TXTIME_DEADLINE_MODE);
1171 sk->sk_txtime_report_errors =
1172 !!(sk_txtime.flags & SOF_TXTIME_REPORT_ERRORS);
1173 }
1174 break;
1175
1176 case SO_BINDTOIFINDEX:
1177 ret = sock_setbindtodevice_locked(sk, val);
1178 break;
1179
1180 default:
1181 ret = -ENOPROTOOPT;
1182 break;
1183 }
1184 release_sock(sk);
1185 return ret;
1186}
1187EXPORT_SYMBOL(sock_setsockopt);
1188
1189
1190static void cred_to_ucred(struct pid *pid, const struct cred *cred,
1191 struct ucred *ucred)
1192{
1193 ucred->pid = pid_vnr(pid);
1194 ucred->uid = ucred->gid = -1;
1195 if (cred) {
1196 struct user_namespace *current_ns = current_user_ns();
1197
1198 ucred->uid = from_kuid_munged(current_ns, cred->euid);
1199 ucred->gid = from_kgid_munged(current_ns, cred->egid);
1200 }
1201}
1202
1203static int groups_to_user(gid_t __user *dst, const struct group_info *src)
1204{
1205 struct user_namespace *user_ns = current_user_ns();
1206 int i;
1207
1208 for (i = 0; i < src->ngroups; i++)
1209 if (put_user(from_kgid_munged(user_ns, src->gid[i]), dst + i))
1210 return -EFAULT;
1211
1212 return 0;
1213}
1214
1215int sock_getsockopt(struct socket *sock, int level, int optname,
1216 char __user *optval, int __user *optlen)
1217{
1218 struct sock *sk = sock->sk;
1219
1220 union {
1221 int val;
1222 u64 val64;
1223 unsigned long ulval;
1224 struct linger ling;
1225 struct old_timeval32 tm32;
1226 struct __kernel_old_timeval tm;
1227 struct __kernel_sock_timeval stm;
1228 struct sock_txtime txtime;
1229 } v;
1230
1231 int lv = sizeof(int);
1232 int len;
1233
1234 if (get_user(len, optlen))
1235 return -EFAULT;
1236 if (len < 0)
1237 return -EINVAL;
1238
1239 memset(&v, 0, sizeof(v));
1240
1241 switch (optname) {
1242 case SO_DEBUG:
1243 v.val = sock_flag(sk, SOCK_DBG);
1244 break;
1245
1246 case SO_DONTROUTE:
1247 v.val = sock_flag(sk, SOCK_LOCALROUTE);
1248 break;
1249
1250 case SO_BROADCAST:
1251 v.val = sock_flag(sk, SOCK_BROADCAST);
1252 break;
1253
1254 case SO_SNDBUF:
1255 v.val = sk->sk_sndbuf;
1256 break;
1257
1258 case SO_RCVBUF:
1259 v.val = sk->sk_rcvbuf;
1260 break;
1261
1262 case SO_REUSEADDR:
1263 v.val = sk->sk_reuse;
1264 break;
1265
1266 case SO_REUSEPORT:
1267 v.val = sk->sk_reuseport;
1268 break;
1269
1270 case SO_KEEPALIVE:
1271 v.val = sock_flag(sk, SOCK_KEEPOPEN);
1272 break;
1273
1274 case SO_TYPE:
1275 v.val = sk->sk_type;
1276 break;
1277
1278 case SO_PROTOCOL:
1279 v.val = sk->sk_protocol;
1280 break;
1281
1282 case SO_DOMAIN:
1283 v.val = sk->sk_family;
1284 break;
1285
1286 case SO_ERROR:
1287 v.val = -sock_error(sk);
1288 if (v.val == 0)
1289 v.val = xchg(&sk->sk_err_soft, 0);
1290 break;
1291
1292 case SO_OOBINLINE:
1293 v.val = sock_flag(sk, SOCK_URGINLINE);
1294 break;
1295
1296 case SO_NO_CHECK:
1297 v.val = sk->sk_no_check_tx;
1298 break;
1299
1300 case SO_PRIORITY:
1301 v.val = sk->sk_priority;
1302 break;
1303
1304 case SO_LINGER:
1305 lv = sizeof(v.ling);
1306 v.ling.l_onoff = sock_flag(sk, SOCK_LINGER);
1307 v.ling.l_linger = sk->sk_lingertime / HZ;
1308 break;
1309
1310 case SO_BSDCOMPAT:
1311 sock_warn_obsolete_bsdism("getsockopt");
1312 break;
1313
1314 case SO_TIMESTAMP_OLD:
1315 v.val = sock_flag(sk, SOCK_RCVTSTAMP) &&
1316 !sock_flag(sk, SOCK_TSTAMP_NEW) &&
1317 !sock_flag(sk, SOCK_RCVTSTAMPNS);
1318 break;
1319
1320 case SO_TIMESTAMPNS_OLD:
1321 v.val = sock_flag(sk, SOCK_RCVTSTAMPNS) && !sock_flag(sk, SOCK_TSTAMP_NEW);
1322 break;
1323
1324 case SO_TIMESTAMP_NEW:
1325 v.val = sock_flag(sk, SOCK_RCVTSTAMP) && sock_flag(sk, SOCK_TSTAMP_NEW);
1326 break;
1327
1328 case SO_TIMESTAMPNS_NEW:
1329 v.val = sock_flag(sk, SOCK_RCVTSTAMPNS) && sock_flag(sk, SOCK_TSTAMP_NEW);
1330 break;
1331
1332 case SO_TIMESTAMPING_OLD:
1333 v.val = sk->sk_tsflags;
1334 break;
1335
1336 case SO_RCVTIMEO_OLD:
1337 case SO_RCVTIMEO_NEW:
1338 lv = sock_get_timeout(sk->sk_rcvtimeo, &v, SO_RCVTIMEO_OLD == optname);
1339 break;
1340
1341 case SO_SNDTIMEO_OLD:
1342 case SO_SNDTIMEO_NEW:
1343 lv = sock_get_timeout(sk->sk_sndtimeo, &v, SO_SNDTIMEO_OLD == optname);
1344 break;
1345
1346 case SO_RCVLOWAT:
1347 v.val = sk->sk_rcvlowat;
1348 break;
1349
1350 case SO_SNDLOWAT:
1351 v.val = 1;
1352 break;
1353
1354 case SO_PASSCRED:
1355 v.val = !!test_bit(SOCK_PASSCRED, &sock->flags);
1356 break;
1357
1358 case SO_PEERCRED:
1359 {
1360 struct ucred peercred;
1361 if (len > sizeof(peercred))
1362 len = sizeof(peercred);
1363 cred_to_ucred(sk->sk_peer_pid, sk->sk_peer_cred, &peercred);
1364 if (copy_to_user(optval, &peercred, len))
1365 return -EFAULT;
1366 goto lenout;
1367 }
1368
1369 case SO_PEERGROUPS:
1370 {
1371 int ret, n;
1372
1373 if (!sk->sk_peer_cred)
1374 return -ENODATA;
1375
1376 n = sk->sk_peer_cred->group_info->ngroups;
1377 if (len < n * sizeof(gid_t)) {
1378 len = n * sizeof(gid_t);
1379 return put_user(len, optlen) ? -EFAULT : -ERANGE;
1380 }
1381 len = n * sizeof(gid_t);
1382
1383 ret = groups_to_user((gid_t __user *)optval,
1384 sk->sk_peer_cred->group_info);
1385 if (ret)
1386 return ret;
1387 goto lenout;
1388 }
1389
1390 case SO_PEERNAME:
1391 {
1392 char address[128];
1393
1394 lv = sock->ops->getname(sock, (struct sockaddr *)address, 2);
1395 if (lv < 0)
1396 return -ENOTCONN;
1397 if (lv < len)
1398 return -EINVAL;
1399 if (copy_to_user(optval, address, len))
1400 return -EFAULT;
1401 goto lenout;
1402 }
1403
1404 /* Dubious BSD thing... Probably nobody even uses it, but
1405 * the UNIX standard wants it for whatever reason... -DaveM
1406 */
1407 case SO_ACCEPTCONN:
1408 v.val = sk->sk_state == TCP_LISTEN;
1409 break;
1410
1411 case SO_PASSSEC:
1412 v.val = !!test_bit(SOCK_PASSSEC, &sock->flags);
1413 break;
1414
1415 case SO_PEERSEC:
1416 return security_socket_getpeersec_stream(sock, optval, optlen, len);
1417
1418 case SO_MARK:
1419 v.val = sk->sk_mark;
1420 break;
1421
1422 case SO_RXQ_OVFL:
1423 v.val = sock_flag(sk, SOCK_RXQ_OVFL);
1424 break;
1425
1426 case SO_WIFI_STATUS:
1427 v.val = sock_flag(sk, SOCK_WIFI_STATUS);
1428 break;
1429
1430 case SO_PEEK_OFF:
1431 if (!sock->ops->set_peek_off)
1432 return -EOPNOTSUPP;
1433
1434 v.val = sk->sk_peek_off;
1435 break;
1436 case SO_NOFCS:
1437 v.val = sock_flag(sk, SOCK_NOFCS);
1438 break;
1439
1440 case SO_BINDTODEVICE:
1441 return sock_getbindtodevice(sk, optval, optlen, len);
1442
1443 case SO_GET_FILTER:
1444 len = sk_get_filter(sk, (struct sock_filter __user *)optval, len);
1445 if (len < 0)
1446 return len;
1447
1448 goto lenout;
1449
1450 case SO_LOCK_FILTER:
1451 v.val = sock_flag(sk, SOCK_FILTER_LOCKED);
1452 break;
1453
1454 case SO_BPF_EXTENSIONS:
1455 v.val = bpf_tell_extensions();
1456 break;
1457
1458 case SO_SELECT_ERR_QUEUE:
1459 v.val = sock_flag(sk, SOCK_SELECT_ERR_QUEUE);
1460 break;
1461
1462#ifdef CONFIG_NET_RX_BUSY_POLL
1463 case SO_BUSY_POLL:
1464 v.val = sk->sk_ll_usec;
1465 break;
1466#endif
1467
1468 case SO_MAX_PACING_RATE:
1469 if (sizeof(v.ulval) != sizeof(v.val) && len >= sizeof(v.ulval)) {
1470 lv = sizeof(v.ulval);
1471 v.ulval = sk->sk_max_pacing_rate;
1472 } else {
1473 /* 32bit version */
1474 v.val = min_t(unsigned long, sk->sk_max_pacing_rate, ~0U);
1475 }
1476 break;
1477
1478 case SO_INCOMING_CPU:
1479 v.val = READ_ONCE(sk->sk_incoming_cpu);
1480 break;
1481
1482 case SO_MEMINFO:
1483 {
1484 u32 meminfo[SK_MEMINFO_VARS];
1485
1486 sk_get_meminfo(sk, meminfo);
1487
1488 len = min_t(unsigned int, len, sizeof(meminfo));
1489 if (copy_to_user(optval, &meminfo, len))
1490 return -EFAULT;
1491
1492 goto lenout;
1493 }
1494
1495#ifdef CONFIG_NET_RX_BUSY_POLL
1496 case SO_INCOMING_NAPI_ID:
1497 v.val = READ_ONCE(sk->sk_napi_id);
1498
1499 /* aggregate non-NAPI IDs down to 0 */
1500 if (v.val < MIN_NAPI_ID)
1501 v.val = 0;
1502
1503 break;
1504#endif
1505
1506 case SO_COOKIE:
1507 lv = sizeof(u64);
1508 if (len < lv)
1509 return -EINVAL;
1510 v.val64 = sock_gen_cookie(sk);
1511 break;
1512
1513 case SO_ZEROCOPY:
1514 v.val = sock_flag(sk, SOCK_ZEROCOPY);
1515 break;
1516
1517 case SO_TXTIME:
1518 lv = sizeof(v.txtime);
1519 v.txtime.clockid = sk->sk_clockid;
1520 v.txtime.flags |= sk->sk_txtime_deadline_mode ?
1521 SOF_TXTIME_DEADLINE_MODE : 0;
1522 v.txtime.flags |= sk->sk_txtime_report_errors ?
1523 SOF_TXTIME_REPORT_ERRORS : 0;
1524 break;
1525
1526 case SO_BINDTOIFINDEX:
1527 v.val = sk->sk_bound_dev_if;
1528 break;
1529
1530 default:
1531 /* We implement the SO_SNDLOWAT etc to not be settable
1532 * (1003.1g 7).
1533 */
1534 return -ENOPROTOOPT;
1535 }
1536
1537 if (len > lv)
1538 len = lv;
1539 if (copy_to_user(optval, &v, len))
1540 return -EFAULT;
1541lenout:
1542 if (put_user(len, optlen))
1543 return -EFAULT;
1544 return 0;
1545}
1546
1547/*
1548 * Initialize an sk_lock.
1549 *
1550 * (We also register the sk_lock with the lock validator.)
1551 */
1552static inline void sock_lock_init(struct sock *sk)
1553{
1554 if (sk->sk_kern_sock)
1555 sock_lock_init_class_and_name(
1556 sk,
1557 af_family_kern_slock_key_strings[sk->sk_family],
1558 af_family_kern_slock_keys + sk->sk_family,
1559 af_family_kern_key_strings[sk->sk_family],
1560 af_family_kern_keys + sk->sk_family);
1561 else
1562 sock_lock_init_class_and_name(
1563 sk,
1564 af_family_slock_key_strings[sk->sk_family],
1565 af_family_slock_keys + sk->sk_family,
1566 af_family_key_strings[sk->sk_family],
1567 af_family_keys + sk->sk_family);
1568}
1569
1570/*
1571 * Copy all fields from osk to nsk but nsk->sk_refcnt must not change yet,
1572 * even temporarly, because of RCU lookups. sk_node should also be left as is.
1573 * We must not copy fields between sk_dontcopy_begin and sk_dontcopy_end
1574 */
1575static void sock_copy(struct sock *nsk, const struct sock *osk)
1576{
1577#ifdef CONFIG_SECURITY_NETWORK
1578 void *sptr = nsk->sk_security;
1579#endif
1580 memcpy(nsk, osk, offsetof(struct sock, sk_dontcopy_begin));
1581
1582 memcpy(&nsk->sk_dontcopy_end, &osk->sk_dontcopy_end,
1583 osk->sk_prot->obj_size - offsetof(struct sock, sk_dontcopy_end));
1584
1585#ifdef CONFIG_SECURITY_NETWORK
1586 nsk->sk_security = sptr;
1587 security_sk_clone(osk, nsk);
1588#endif
1589}
1590
1591static struct sock *sk_prot_alloc(struct proto *prot, gfp_t priority,
1592 int family)
1593{
1594 struct sock *sk;
1595 struct kmem_cache *slab;
1596
1597 slab = prot->slab;
1598 if (slab != NULL) {
1599 sk = kmem_cache_alloc(slab, priority & ~__GFP_ZERO);
1600 if (!sk)
1601 return sk;
1602 if (want_init_on_alloc(priority))
1603 sk_prot_clear_nulls(sk, prot->obj_size);
1604 } else
1605 sk = kmalloc(prot->obj_size, priority);
1606
1607 if (sk != NULL) {
1608 if (security_sk_alloc(sk, family, priority))
1609 goto out_free;
1610
1611 if (!try_module_get(prot->owner))
1612 goto out_free_sec;
1613 sk_tx_queue_clear(sk);
1614 }
1615
1616 return sk;
1617
1618out_free_sec:
1619 security_sk_free(sk);
1620out_free:
1621 if (slab != NULL)
1622 kmem_cache_free(slab, sk);
1623 else
1624 kfree(sk);
1625 return NULL;
1626}
1627
1628static void sk_prot_free(struct proto *prot, struct sock *sk)
1629{
1630 struct kmem_cache *slab;
1631 struct module *owner;
1632
1633 owner = prot->owner;
1634 slab = prot->slab;
1635
1636 cgroup_sk_free(&sk->sk_cgrp_data);
1637 mem_cgroup_sk_free(sk);
1638 security_sk_free(sk);
1639 if (slab != NULL)
1640 kmem_cache_free(slab, sk);
1641 else
1642 kfree(sk);
1643 module_put(owner);
1644}
1645
1646/**
1647 * sk_alloc - All socket objects are allocated here
1648 * @net: the applicable net namespace
1649 * @family: protocol family
1650 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
1651 * @prot: struct proto associated with this new sock instance
1652 * @kern: is this to be a kernel socket?
1653 */
1654struct sock *sk_alloc(struct net *net, int family, gfp_t priority,
1655 struct proto *prot, int kern)
1656{
1657 struct sock *sk;
1658
1659 sk = sk_prot_alloc(prot, priority | __GFP_ZERO, family);
1660 if (sk) {
1661 sk->sk_family = family;
1662 /*
1663 * See comment in struct sock definition to understand
1664 * why we need sk_prot_creator -acme
1665 */
1666 sk->sk_prot = sk->sk_prot_creator = prot;
1667 sk->sk_kern_sock = kern;
1668 sock_lock_init(sk);
1669 sk->sk_net_refcnt = kern ? 0 : 1;
1670 if (likely(sk->sk_net_refcnt)) {
1671 get_net(net);
1672 sock_inuse_add(net, 1);
1673 }
1674
1675 sock_net_set(sk, net);
1676 refcount_set(&sk->sk_wmem_alloc, 1);
1677
1678 mem_cgroup_sk_alloc(sk);
1679 cgroup_sk_alloc(&sk->sk_cgrp_data);
1680 sock_update_classid(&sk->sk_cgrp_data);
1681 sock_update_netprioidx(&sk->sk_cgrp_data);
1682 }
1683
1684 return sk;
1685}
1686EXPORT_SYMBOL(sk_alloc);
1687
1688/* Sockets having SOCK_RCU_FREE will call this function after one RCU
1689 * grace period. This is the case for UDP sockets and TCP listeners.
1690 */
1691static void __sk_destruct(struct rcu_head *head)
1692{
1693 struct sock *sk = container_of(head, struct sock, sk_rcu);
1694 struct sk_filter *filter;
1695
1696 if (sk->sk_destruct)
1697 sk->sk_destruct(sk);
1698
1699 filter = rcu_dereference_check(sk->sk_filter,
1700 refcount_read(&sk->sk_wmem_alloc) == 0);
1701 if (filter) {
1702 sk_filter_uncharge(sk, filter);
1703 RCU_INIT_POINTER(sk->sk_filter, NULL);
1704 }
1705
1706 sock_disable_timestamp(sk, SK_FLAGS_TIMESTAMP);
1707
1708#ifdef CONFIG_BPF_SYSCALL
1709 bpf_sk_storage_free(sk);
1710#endif
1711
1712 if (atomic_read(&sk->sk_omem_alloc))
1713 pr_debug("%s: optmem leakage (%d bytes) detected\n",
1714 __func__, atomic_read(&sk->sk_omem_alloc));
1715
1716 if (sk->sk_frag.page) {
1717 put_page(sk->sk_frag.page);
1718 sk->sk_frag.page = NULL;
1719 }
1720
1721 if (sk->sk_peer_cred)
1722 put_cred(sk->sk_peer_cred);
1723 put_pid(sk->sk_peer_pid);
1724 if (likely(sk->sk_net_refcnt))
1725 put_net(sock_net(sk));
1726 sk_prot_free(sk->sk_prot_creator, sk);
1727}
1728
1729void sk_destruct(struct sock *sk)
1730{
1731 bool use_call_rcu = sock_flag(sk, SOCK_RCU_FREE);
1732
1733 if (rcu_access_pointer(sk->sk_reuseport_cb)) {
1734 reuseport_detach_sock(sk);
1735 use_call_rcu = true;
1736 }
1737
1738 if (use_call_rcu)
1739 call_rcu(&sk->sk_rcu, __sk_destruct);
1740 else
1741 __sk_destruct(&sk->sk_rcu);
1742}
1743
1744static void __sk_free(struct sock *sk)
1745{
1746 if (likely(sk->sk_net_refcnt))
1747 sock_inuse_add(sock_net(sk), -1);
1748
1749 if (unlikely(sk->sk_net_refcnt && sock_diag_has_destroy_listeners(sk)))
1750 sock_diag_broadcast_destroy(sk);
1751 else
1752 sk_destruct(sk);
1753}
1754
1755void sk_free(struct sock *sk)
1756{
1757 /*
1758 * We subtract one from sk_wmem_alloc and can know if
1759 * some packets are still in some tx queue.
1760 * If not null, sock_wfree() will call __sk_free(sk) later
1761 */
1762 if (refcount_dec_and_test(&sk->sk_wmem_alloc))
1763 __sk_free(sk);
1764}
1765EXPORT_SYMBOL(sk_free);
1766
1767static void sk_init_common(struct sock *sk)
1768{
1769 skb_queue_head_init(&sk->sk_receive_queue);
1770 skb_queue_head_init(&sk->sk_write_queue);
1771 skb_queue_head_init(&sk->sk_error_queue);
1772
1773 rwlock_init(&sk->sk_callback_lock);
1774 lockdep_set_class_and_name(&sk->sk_receive_queue.lock,
1775 af_rlock_keys + sk->sk_family,
1776 af_family_rlock_key_strings[sk->sk_family]);
1777 lockdep_set_class_and_name(&sk->sk_write_queue.lock,
1778 af_wlock_keys + sk->sk_family,
1779 af_family_wlock_key_strings[sk->sk_family]);
1780 lockdep_set_class_and_name(&sk->sk_error_queue.lock,
1781 af_elock_keys + sk->sk_family,
1782 af_family_elock_key_strings[sk->sk_family]);
1783 lockdep_set_class_and_name(&sk->sk_callback_lock,
1784 af_callback_keys + sk->sk_family,
1785 af_family_clock_key_strings[sk->sk_family]);
1786}
1787
1788/**
1789 * sk_clone_lock - clone a socket, and lock its clone
1790 * @sk: the socket to clone
1791 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
1792 *
1793 * Caller must unlock socket even in error path (bh_unlock_sock(newsk))
1794 */
1795struct sock *sk_clone_lock(const struct sock *sk, const gfp_t priority)
1796{
1797 struct sock *newsk;
1798 bool is_charged = true;
1799
1800 newsk = sk_prot_alloc(sk->sk_prot, priority, sk->sk_family);
1801 if (newsk != NULL) {
1802 struct sk_filter *filter;
1803
1804 sock_copy(newsk, sk);
1805
1806 newsk->sk_prot_creator = sk->sk_prot;
1807
1808 /* SANITY */
1809 if (likely(newsk->sk_net_refcnt))
1810 get_net(sock_net(newsk));
1811 sk_node_init(&newsk->sk_node);
1812 sock_lock_init(newsk);
1813 bh_lock_sock(newsk);
1814 newsk->sk_backlog.head = newsk->sk_backlog.tail = NULL;
1815 newsk->sk_backlog.len = 0;
1816
1817 atomic_set(&newsk->sk_rmem_alloc, 0);
1818 /*
1819 * sk_wmem_alloc set to one (see sk_free() and sock_wfree())
1820 */
1821 refcount_set(&newsk->sk_wmem_alloc, 1);
1822 atomic_set(&newsk->sk_omem_alloc, 0);
1823 sk_init_common(newsk);
1824
1825 newsk->sk_dst_cache = NULL;
1826 newsk->sk_dst_pending_confirm = 0;
1827 newsk->sk_wmem_queued = 0;
1828 newsk->sk_forward_alloc = 0;
1829 atomic_set(&newsk->sk_drops, 0);
1830 newsk->sk_send_head = NULL;
1831 newsk->sk_userlocks = sk->sk_userlocks & ~SOCK_BINDPORT_LOCK;
1832 atomic_set(&newsk->sk_zckey, 0);
1833
1834 sock_reset_flag(newsk, SOCK_DONE);
1835 mem_cgroup_sk_alloc(newsk);
1836 cgroup_sk_alloc(&newsk->sk_cgrp_data);
1837
1838 rcu_read_lock();
1839 filter = rcu_dereference(sk->sk_filter);
1840 if (filter != NULL)
1841 /* though it's an empty new sock, the charging may fail
1842 * if sysctl_optmem_max was changed between creation of
1843 * original socket and cloning
1844 */
1845 is_charged = sk_filter_charge(newsk, filter);
1846 RCU_INIT_POINTER(newsk->sk_filter, filter);
1847 rcu_read_unlock();
1848
1849 if (unlikely(!is_charged || xfrm_sk_clone_policy(newsk, sk))) {
1850 /* We need to make sure that we don't uncharge the new
1851 * socket if we couldn't charge it in the first place
1852 * as otherwise we uncharge the parent's filter.
1853 */
1854 if (!is_charged)
1855 RCU_INIT_POINTER(newsk->sk_filter, NULL);
1856 sk_free_unlock_clone(newsk);
1857 newsk = NULL;
1858 goto out;
1859 }
1860 RCU_INIT_POINTER(newsk->sk_reuseport_cb, NULL);
1861
1862 if (bpf_sk_storage_clone(sk, newsk)) {
1863 sk_free_unlock_clone(newsk);
1864 newsk = NULL;
1865 goto out;
1866 }
1867
1868 newsk->sk_err = 0;
1869 newsk->sk_err_soft = 0;
1870 newsk->sk_priority = 0;
1871 newsk->sk_incoming_cpu = raw_smp_processor_id();
1872 if (likely(newsk->sk_net_refcnt))
1873 sock_inuse_add(sock_net(newsk), 1);
1874
1875 /*
1876 * Before updating sk_refcnt, we must commit prior changes to memory
1877 * (Documentation/RCU/rculist_nulls.txt for details)
1878 */
1879 smp_wmb();
1880 refcount_set(&newsk->sk_refcnt, 2);
1881
1882 /*
1883 * Increment the counter in the same struct proto as the master
1884 * sock (sk_refcnt_debug_inc uses newsk->sk_prot->socks, that
1885 * is the same as sk->sk_prot->socks, as this field was copied
1886 * with memcpy).
1887 *
1888 * This _changes_ the previous behaviour, where
1889 * tcp_create_openreq_child always was incrementing the
1890 * equivalent to tcp_prot->socks (inet_sock_nr), so this have
1891 * to be taken into account in all callers. -acme
1892 */
1893 sk_refcnt_debug_inc(newsk);
1894 sk_set_socket(newsk, NULL);
1895 RCU_INIT_POINTER(newsk->sk_wq, NULL);
1896
1897 if (newsk->sk_prot->sockets_allocated)
1898 sk_sockets_allocated_inc(newsk);
1899
1900 if (sock_needs_netstamp(sk) &&
1901 newsk->sk_flags & SK_FLAGS_TIMESTAMP)
1902 net_enable_timestamp();
1903 }
1904out:
1905 return newsk;
1906}
1907EXPORT_SYMBOL_GPL(sk_clone_lock);
1908
1909void sk_free_unlock_clone(struct sock *sk)
1910{
1911 /* It is still raw copy of parent, so invalidate
1912 * destructor and make plain sk_free() */
1913 sk->sk_destruct = NULL;
1914 bh_unlock_sock(sk);
1915 sk_free(sk);
1916}
1917EXPORT_SYMBOL_GPL(sk_free_unlock_clone);
1918
1919void sk_setup_caps(struct sock *sk, struct dst_entry *dst)
1920{
1921 u32 max_segs = 1;
1922
1923 sk_dst_set(sk, dst);
1924 sk->sk_route_caps = dst->dev->features | sk->sk_route_forced_caps;
1925 if (sk->sk_route_caps & NETIF_F_GSO)
1926 sk->sk_route_caps |= NETIF_F_GSO_SOFTWARE;
1927 sk->sk_route_caps &= ~sk->sk_route_nocaps;
1928 if (sk_can_gso(sk)) {
1929 if (dst->header_len && !xfrm_dst_offload_ok(dst)) {
1930 sk->sk_route_caps &= ~NETIF_F_GSO_MASK;
1931 } else {
1932 sk->sk_route_caps |= NETIF_F_SG | NETIF_F_HW_CSUM;
1933 sk->sk_gso_max_size = dst->dev->gso_max_size;
1934 max_segs = max_t(u32, dst->dev->gso_max_segs, 1);
1935 }
1936 }
1937 sk->sk_gso_max_segs = max_segs;
1938}
1939EXPORT_SYMBOL_GPL(sk_setup_caps);
1940
1941/*
1942 * Simple resource managers for sockets.
1943 */
1944
1945
1946/*
1947 * Write buffer destructor automatically called from kfree_skb.
1948 */
1949void sock_wfree(struct sk_buff *skb)
1950{
1951 struct sock *sk = skb->sk;
1952 unsigned int len = skb->truesize;
1953
1954 if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE)) {
1955 /*
1956 * Keep a reference on sk_wmem_alloc, this will be released
1957 * after sk_write_space() call
1958 */
1959 WARN_ON(refcount_sub_and_test(len - 1, &sk->sk_wmem_alloc));
1960 sk->sk_write_space(sk);
1961 len = 1;
1962 }
1963 /*
1964 * if sk_wmem_alloc reaches 0, we must finish what sk_free()
1965 * could not do because of in-flight packets
1966 */
1967 if (refcount_sub_and_test(len, &sk->sk_wmem_alloc))
1968 __sk_free(sk);
1969}
1970EXPORT_SYMBOL(sock_wfree);
1971
1972/* This variant of sock_wfree() is used by TCP,
1973 * since it sets SOCK_USE_WRITE_QUEUE.
1974 */
1975void __sock_wfree(struct sk_buff *skb)
1976{
1977 struct sock *sk = skb->sk;
1978
1979 if (refcount_sub_and_test(skb->truesize, &sk->sk_wmem_alloc))
1980 __sk_free(sk);
1981}
1982
1983void skb_set_owner_w(struct sk_buff *skb, struct sock *sk)
1984{
1985 skb_orphan(skb);
1986 skb->sk = sk;
1987#ifdef CONFIG_INET
1988 if (unlikely(!sk_fullsock(sk))) {
1989 skb->destructor = sock_edemux;
1990 sock_hold(sk);
1991 return;
1992 }
1993#endif
1994 skb->destructor = sock_wfree;
1995 skb_set_hash_from_sk(skb, sk);
1996 /*
1997 * We used to take a refcount on sk, but following operation
1998 * is enough to guarantee sk_free() wont free this sock until
1999 * all in-flight packets are completed
2000 */
2001 refcount_add(skb->truesize, &sk->sk_wmem_alloc);
2002}
2003EXPORT_SYMBOL(skb_set_owner_w);
2004
2005static bool can_skb_orphan_partial(const struct sk_buff *skb)
2006{
2007#ifdef CONFIG_TLS_DEVICE
2008 /* Drivers depend on in-order delivery for crypto offload,
2009 * partial orphan breaks out-of-order-OK logic.
2010 */
2011 if (skb->decrypted)
2012 return false;
2013#endif
2014 return (skb->destructor == sock_wfree ||
2015 (IS_ENABLED(CONFIG_INET) && skb->destructor == tcp_wfree));
2016}
2017
2018/* This helper is used by netem, as it can hold packets in its
2019 * delay queue. We want to allow the owner socket to send more
2020 * packets, as if they were already TX completed by a typical driver.
2021 * But we also want to keep skb->sk set because some packet schedulers
2022 * rely on it (sch_fq for example).
2023 */
2024void skb_orphan_partial(struct sk_buff *skb)
2025{
2026 if (skb_is_tcp_pure_ack(skb))
2027 return;
2028
2029 if (can_skb_orphan_partial(skb)) {
2030 struct sock *sk = skb->sk;
2031
2032 if (refcount_inc_not_zero(&sk->sk_refcnt)) {
2033 WARN_ON(refcount_sub_and_test(skb->truesize, &sk->sk_wmem_alloc));
2034 skb->destructor = sock_efree;
2035 }
2036 } else {
2037 skb_orphan(skb);
2038 }
2039}
2040EXPORT_SYMBOL(skb_orphan_partial);
2041
2042/*
2043 * Read buffer destructor automatically called from kfree_skb.
2044 */
2045void sock_rfree(struct sk_buff *skb)
2046{
2047 struct sock *sk = skb->sk;
2048 unsigned int len = skb->truesize;
2049
2050 atomic_sub(len, &sk->sk_rmem_alloc);
2051 sk_mem_uncharge(sk, len);
2052}
2053EXPORT_SYMBOL(sock_rfree);
2054
2055/*
2056 * Buffer destructor for skbs that are not used directly in read or write
2057 * path, e.g. for error handler skbs. Automatically called from kfree_skb.
2058 */
2059void sock_efree(struct sk_buff *skb)
2060{
2061 sock_put(skb->sk);
2062}
2063EXPORT_SYMBOL(sock_efree);
2064
2065kuid_t sock_i_uid(struct sock *sk)
2066{
2067 kuid_t uid;
2068
2069 read_lock_bh(&sk->sk_callback_lock);
2070 uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : GLOBAL_ROOT_UID;
2071 read_unlock_bh(&sk->sk_callback_lock);
2072 return uid;
2073}
2074EXPORT_SYMBOL(sock_i_uid);
2075
2076unsigned long sock_i_ino(struct sock *sk)
2077{
2078 unsigned long ino;
2079
2080 read_lock_bh(&sk->sk_callback_lock);
2081 ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0;
2082 read_unlock_bh(&sk->sk_callback_lock);
2083 return ino;
2084}
2085EXPORT_SYMBOL(sock_i_ino);
2086
2087/*
2088 * Allocate a skb from the socket's send buffer.
2089 */
2090struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force,
2091 gfp_t priority)
2092{
2093 if (force ||
2094 refcount_read(&sk->sk_wmem_alloc) < READ_ONCE(sk->sk_sndbuf)) {
2095 struct sk_buff *skb = alloc_skb(size, priority);
2096
2097 if (skb) {
2098 skb_set_owner_w(skb, sk);
2099 return skb;
2100 }
2101 }
2102 return NULL;
2103}
2104EXPORT_SYMBOL(sock_wmalloc);
2105
2106static void sock_ofree(struct sk_buff *skb)
2107{
2108 struct sock *sk = skb->sk;
2109
2110 atomic_sub(skb->truesize, &sk->sk_omem_alloc);
2111}
2112
2113struct sk_buff *sock_omalloc(struct sock *sk, unsigned long size,
2114 gfp_t priority)
2115{
2116 struct sk_buff *skb;
2117
2118 /* small safe race: SKB_TRUESIZE may differ from final skb->truesize */
2119 if (atomic_read(&sk->sk_omem_alloc) + SKB_TRUESIZE(size) >
2120 sysctl_optmem_max)
2121 return NULL;
2122
2123 skb = alloc_skb(size, priority);
2124 if (!skb)
2125 return NULL;
2126
2127 atomic_add(skb->truesize, &sk->sk_omem_alloc);
2128 skb->sk = sk;
2129 skb->destructor = sock_ofree;
2130 return skb;
2131}
2132
2133/*
2134 * Allocate a memory block from the socket's option memory buffer.
2135 */
2136void *sock_kmalloc(struct sock *sk, int size, gfp_t priority)
2137{
2138 if ((unsigned int)size <= sysctl_optmem_max &&
2139 atomic_read(&sk->sk_omem_alloc) + size < sysctl_optmem_max) {
2140 void *mem;
2141 /* First do the add, to avoid the race if kmalloc
2142 * might sleep.
2143 */
2144 atomic_add(size, &sk->sk_omem_alloc);
2145 mem = kmalloc(size, priority);
2146 if (mem)
2147 return mem;
2148 atomic_sub(size, &sk->sk_omem_alloc);
2149 }
2150 return NULL;
2151}
2152EXPORT_SYMBOL(sock_kmalloc);
2153
2154/* Free an option memory block. Note, we actually want the inline
2155 * here as this allows gcc to detect the nullify and fold away the
2156 * condition entirely.
2157 */
2158static inline void __sock_kfree_s(struct sock *sk, void *mem, int size,
2159 const bool nullify)
2160{
2161 if (WARN_ON_ONCE(!mem))
2162 return;
2163 if (nullify)
2164 kzfree(mem);
2165 else
2166 kfree(mem);
2167 atomic_sub(size, &sk->sk_omem_alloc);
2168}
2169
2170void sock_kfree_s(struct sock *sk, void *mem, int size)
2171{
2172 __sock_kfree_s(sk, mem, size, false);
2173}
2174EXPORT_SYMBOL(sock_kfree_s);
2175
2176void sock_kzfree_s(struct sock *sk, void *mem, int size)
2177{
2178 __sock_kfree_s(sk, mem, size, true);
2179}
2180EXPORT_SYMBOL(sock_kzfree_s);
2181
2182/* It is almost wait_for_tcp_memory minus release_sock/lock_sock.
2183 I think, these locks should be removed for datagram sockets.
2184 */
2185static long sock_wait_for_wmem(struct sock *sk, long timeo)
2186{
2187 DEFINE_WAIT(wait);
2188
2189 sk_clear_bit(SOCKWQ_ASYNC_NOSPACE, sk);
2190 for (;;) {
2191 if (!timeo)
2192 break;
2193 if (signal_pending(current))
2194 break;
2195 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
2196 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
2197 if (refcount_read(&sk->sk_wmem_alloc) < READ_ONCE(sk->sk_sndbuf))
2198 break;
2199 if (sk->sk_shutdown & SEND_SHUTDOWN)
2200 break;
2201 if (sk->sk_err)
2202 break;
2203 timeo = schedule_timeout(timeo);
2204 }
2205 finish_wait(sk_sleep(sk), &wait);
2206 return timeo;
2207}
2208
2209
2210/*
2211 * Generic send/receive buffer handlers
2212 */
2213
2214struct sk_buff *sock_alloc_send_pskb(struct sock *sk, unsigned long header_len,
2215 unsigned long data_len, int noblock,
2216 int *errcode, int max_page_order)
2217{
2218 struct sk_buff *skb;
2219 long timeo;
2220 int err;
2221
2222 timeo = sock_sndtimeo(sk, noblock);
2223 for (;;) {
2224 err = sock_error(sk);
2225 if (err != 0)
2226 goto failure;
2227
2228 err = -EPIPE;
2229 if (sk->sk_shutdown & SEND_SHUTDOWN)
2230 goto failure;
2231
2232 if (sk_wmem_alloc_get(sk) < READ_ONCE(sk->sk_sndbuf))
2233 break;
2234
2235 sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk);
2236 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
2237 err = -EAGAIN;
2238 if (!timeo)
2239 goto failure;
2240 if (signal_pending(current))
2241 goto interrupted;
2242 timeo = sock_wait_for_wmem(sk, timeo);
2243 }
2244 skb = alloc_skb_with_frags(header_len, data_len, max_page_order,
2245 errcode, sk->sk_allocation);
2246 if (skb)
2247 skb_set_owner_w(skb, sk);
2248 return skb;
2249
2250interrupted:
2251 err = sock_intr_errno(timeo);
2252failure:
2253 *errcode = err;
2254 return NULL;
2255}
2256EXPORT_SYMBOL(sock_alloc_send_pskb);
2257
2258struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size,
2259 int noblock, int *errcode)
2260{
2261 return sock_alloc_send_pskb(sk, size, 0, noblock, errcode, 0);
2262}
2263EXPORT_SYMBOL(sock_alloc_send_skb);
2264
2265int __sock_cmsg_send(struct sock *sk, struct msghdr *msg, struct cmsghdr *cmsg,
2266 struct sockcm_cookie *sockc)
2267{
2268 u32 tsflags;
2269
2270 switch (cmsg->cmsg_type) {
2271 case SO_MARK:
2272 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
2273 return -EPERM;
2274 if (cmsg->cmsg_len != CMSG_LEN(sizeof(u32)))
2275 return -EINVAL;
2276 sockc->mark = *(u32 *)CMSG_DATA(cmsg);
2277 break;
2278 case SO_TIMESTAMPING_OLD:
2279 if (cmsg->cmsg_len != CMSG_LEN(sizeof(u32)))
2280 return -EINVAL;
2281
2282 tsflags = *(u32 *)CMSG_DATA(cmsg);
2283 if (tsflags & ~SOF_TIMESTAMPING_TX_RECORD_MASK)
2284 return -EINVAL;
2285
2286 sockc->tsflags &= ~SOF_TIMESTAMPING_TX_RECORD_MASK;
2287 sockc->tsflags |= tsflags;
2288 break;
2289 case SCM_TXTIME:
2290 if (!sock_flag(sk, SOCK_TXTIME))
2291 return -EINVAL;
2292 if (cmsg->cmsg_len != CMSG_LEN(sizeof(u64)))
2293 return -EINVAL;
2294 sockc->transmit_time = get_unaligned((u64 *)CMSG_DATA(cmsg));
2295 break;
2296 /* SCM_RIGHTS and SCM_CREDENTIALS are semantically in SOL_UNIX. */
2297 case SCM_RIGHTS:
2298 case SCM_CREDENTIALS:
2299 break;
2300 default:
2301 return -EINVAL;
2302 }
2303 return 0;
2304}
2305EXPORT_SYMBOL(__sock_cmsg_send);
2306
2307int sock_cmsg_send(struct sock *sk, struct msghdr *msg,
2308 struct sockcm_cookie *sockc)
2309{
2310 struct cmsghdr *cmsg;
2311 int ret;
2312
2313 for_each_cmsghdr(cmsg, msg) {
2314 if (!CMSG_OK(msg, cmsg))
2315 return -EINVAL;
2316 if (cmsg->cmsg_level != SOL_SOCKET)
2317 continue;
2318 ret = __sock_cmsg_send(sk, msg, cmsg, sockc);
2319 if (ret)
2320 return ret;
2321 }
2322 return 0;
2323}
2324EXPORT_SYMBOL(sock_cmsg_send);
2325
2326static void sk_enter_memory_pressure(struct sock *sk)
2327{
2328 if (!sk->sk_prot->enter_memory_pressure)
2329 return;
2330
2331 sk->sk_prot->enter_memory_pressure(sk);
2332}
2333
2334static void sk_leave_memory_pressure(struct sock *sk)
2335{
2336 if (sk->sk_prot->leave_memory_pressure) {
2337 sk->sk_prot->leave_memory_pressure(sk);
2338 } else {
2339 unsigned long *memory_pressure = sk->sk_prot->memory_pressure;
2340
2341 if (memory_pressure && READ_ONCE(*memory_pressure))
2342 WRITE_ONCE(*memory_pressure, 0);
2343 }
2344}
2345
2346/* On 32bit arches, an skb frag is limited to 2^15 */
2347#define SKB_FRAG_PAGE_ORDER get_order(32768)
2348DEFINE_STATIC_KEY_FALSE(net_high_order_alloc_disable_key);
2349
2350/**
2351 * skb_page_frag_refill - check that a page_frag contains enough room
2352 * @sz: minimum size of the fragment we want to get
2353 * @pfrag: pointer to page_frag
2354 * @gfp: priority for memory allocation
2355 *
2356 * Note: While this allocator tries to use high order pages, there is
2357 * no guarantee that allocations succeed. Therefore, @sz MUST be
2358 * less or equal than PAGE_SIZE.
2359 */
2360bool skb_page_frag_refill(unsigned int sz, struct page_frag *pfrag, gfp_t gfp)
2361{
2362 if (pfrag->page) {
2363 if (page_ref_count(pfrag->page) == 1) {
2364 pfrag->offset = 0;
2365 return true;
2366 }
2367 if (pfrag->offset + sz <= pfrag->size)
2368 return true;
2369 put_page(pfrag->page);
2370 }
2371
2372 pfrag->offset = 0;
2373 if (SKB_FRAG_PAGE_ORDER &&
2374 !static_branch_unlikely(&net_high_order_alloc_disable_key)) {
2375 /* Avoid direct reclaim but allow kswapd to wake */
2376 pfrag->page = alloc_pages((gfp & ~__GFP_DIRECT_RECLAIM) |
2377 __GFP_COMP | __GFP_NOWARN |
2378 __GFP_NORETRY,
2379 SKB_FRAG_PAGE_ORDER);
2380 if (likely(pfrag->page)) {
2381 pfrag->size = PAGE_SIZE << SKB_FRAG_PAGE_ORDER;
2382 return true;
2383 }
2384 }
2385 pfrag->page = alloc_page(gfp);
2386 if (likely(pfrag->page)) {
2387 pfrag->size = PAGE_SIZE;
2388 return true;
2389 }
2390 return false;
2391}
2392EXPORT_SYMBOL(skb_page_frag_refill);
2393
2394bool sk_page_frag_refill(struct sock *sk, struct page_frag *pfrag)
2395{
2396 if (likely(skb_page_frag_refill(32U, pfrag, sk->sk_allocation)))
2397 return true;
2398
2399 sk_enter_memory_pressure(sk);
2400 sk_stream_moderate_sndbuf(sk);
2401 return false;
2402}
2403EXPORT_SYMBOL(sk_page_frag_refill);
2404
2405static void __lock_sock(struct sock *sk)
2406 __releases(&sk->sk_lock.slock)
2407 __acquires(&sk->sk_lock.slock)
2408{
2409 DEFINE_WAIT(wait);
2410
2411 for (;;) {
2412 prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait,
2413 TASK_UNINTERRUPTIBLE);
2414 spin_unlock_bh(&sk->sk_lock.slock);
2415 schedule();
2416 spin_lock_bh(&sk->sk_lock.slock);
2417 if (!sock_owned_by_user(sk))
2418 break;
2419 }
2420 finish_wait(&sk->sk_lock.wq, &wait);
2421}
2422
2423void __release_sock(struct sock *sk)
2424 __releases(&sk->sk_lock.slock)
2425 __acquires(&sk->sk_lock.slock)
2426{
2427 struct sk_buff *skb, *next;
2428
2429 while ((skb = sk->sk_backlog.head) != NULL) {
2430 sk->sk_backlog.head = sk->sk_backlog.tail = NULL;
2431
2432 spin_unlock_bh(&sk->sk_lock.slock);
2433
2434 do {
2435 next = skb->next;
2436 prefetch(next);
2437 WARN_ON_ONCE(skb_dst_is_noref(skb));
2438 skb_mark_not_on_list(skb);
2439 sk_backlog_rcv(sk, skb);
2440
2441 cond_resched();
2442
2443 skb = next;
2444 } while (skb != NULL);
2445
2446 spin_lock_bh(&sk->sk_lock.slock);
2447 }
2448
2449 /*
2450 * Doing the zeroing here guarantee we can not loop forever
2451 * while a wild producer attempts to flood us.
2452 */
2453 sk->sk_backlog.len = 0;
2454}
2455
2456void __sk_flush_backlog(struct sock *sk)
2457{
2458 spin_lock_bh(&sk->sk_lock.slock);
2459 __release_sock(sk);
2460 spin_unlock_bh(&sk->sk_lock.slock);
2461}
2462
2463/**
2464 * sk_wait_data - wait for data to arrive at sk_receive_queue
2465 * @sk: sock to wait on
2466 * @timeo: for how long
2467 * @skb: last skb seen on sk_receive_queue
2468 *
2469 * Now socket state including sk->sk_err is changed only under lock,
2470 * hence we may omit checks after joining wait queue.
2471 * We check receive queue before schedule() only as optimization;
2472 * it is very likely that release_sock() added new data.
2473 */
2474int sk_wait_data(struct sock *sk, long *timeo, const struct sk_buff *skb)
2475{
2476 DEFINE_WAIT_FUNC(wait, woken_wake_function);
2477 int rc;
2478
2479 add_wait_queue(sk_sleep(sk), &wait);
2480 sk_set_bit(SOCKWQ_ASYNC_WAITDATA, sk);
2481 rc = sk_wait_event(sk, timeo, skb_peek_tail(&sk->sk_receive_queue) != skb, &wait);
2482 sk_clear_bit(SOCKWQ_ASYNC_WAITDATA, sk);
2483 remove_wait_queue(sk_sleep(sk), &wait);
2484 return rc;
2485}
2486EXPORT_SYMBOL(sk_wait_data);
2487
2488/**
2489 * __sk_mem_raise_allocated - increase memory_allocated
2490 * @sk: socket
2491 * @size: memory size to allocate
2492 * @amt: pages to allocate
2493 * @kind: allocation type
2494 *
2495 * Similar to __sk_mem_schedule(), but does not update sk_forward_alloc
2496 */
2497int __sk_mem_raise_allocated(struct sock *sk, int size, int amt, int kind)
2498{
2499 struct proto *prot = sk->sk_prot;
2500 long allocated = sk_memory_allocated_add(sk, amt);
2501 bool charged = true;
2502
2503 if (mem_cgroup_sockets_enabled && sk->sk_memcg &&
2504 !(charged = mem_cgroup_charge_skmem(sk->sk_memcg, amt)))
2505 goto suppress_allocation;
2506
2507 /* Under limit. */
2508 if (allocated <= sk_prot_mem_limits(sk, 0)) {
2509 sk_leave_memory_pressure(sk);
2510 return 1;
2511 }
2512
2513 /* Under pressure. */
2514 if (allocated > sk_prot_mem_limits(sk, 1))
2515 sk_enter_memory_pressure(sk);
2516
2517 /* Over hard limit. */
2518 if (allocated > sk_prot_mem_limits(sk, 2))
2519 goto suppress_allocation;
2520
2521 /* guarantee minimum buffer size under pressure */
2522 if (kind == SK_MEM_RECV) {
2523 if (atomic_read(&sk->sk_rmem_alloc) < sk_get_rmem0(sk, prot))
2524 return 1;
2525
2526 } else { /* SK_MEM_SEND */
2527 int wmem0 = sk_get_wmem0(sk, prot);
2528
2529 if (sk->sk_type == SOCK_STREAM) {
2530 if (sk->sk_wmem_queued < wmem0)
2531 return 1;
2532 } else if (refcount_read(&sk->sk_wmem_alloc) < wmem0) {
2533 return 1;
2534 }
2535 }
2536
2537 if (sk_has_memory_pressure(sk)) {
2538 u64 alloc;
2539
2540 if (!sk_under_memory_pressure(sk))
2541 return 1;
2542 alloc = sk_sockets_allocated_read_positive(sk);
2543 if (sk_prot_mem_limits(sk, 2) > alloc *
2544 sk_mem_pages(sk->sk_wmem_queued +
2545 atomic_read(&sk->sk_rmem_alloc) +
2546 sk->sk_forward_alloc))
2547 return 1;
2548 }
2549
2550suppress_allocation:
2551
2552 if (kind == SK_MEM_SEND && sk->sk_type == SOCK_STREAM) {
2553 sk_stream_moderate_sndbuf(sk);
2554
2555 /* Fail only if socket is _under_ its sndbuf.
2556 * In this case we cannot block, so that we have to fail.
2557 */
2558 if (sk->sk_wmem_queued + size >= sk->sk_sndbuf)
2559 return 1;
2560 }
2561
2562 if (kind == SK_MEM_SEND || (kind == SK_MEM_RECV && charged))
2563 trace_sock_exceed_buf_limit(sk, prot, allocated, kind);
2564
2565 sk_memory_allocated_sub(sk, amt);
2566
2567 if (mem_cgroup_sockets_enabled && sk->sk_memcg)
2568 mem_cgroup_uncharge_skmem(sk->sk_memcg, amt);
2569
2570 return 0;
2571}
2572EXPORT_SYMBOL(__sk_mem_raise_allocated);
2573
2574/**
2575 * __sk_mem_schedule - increase sk_forward_alloc and memory_allocated
2576 * @sk: socket
2577 * @size: memory size to allocate
2578 * @kind: allocation type
2579 *
2580 * If kind is SK_MEM_SEND, it means wmem allocation. Otherwise it means
2581 * rmem allocation. This function assumes that protocols which have
2582 * memory_pressure use sk_wmem_queued as write buffer accounting.
2583 */
2584int __sk_mem_schedule(struct sock *sk, int size, int kind)
2585{
2586 int ret, amt = sk_mem_pages(size);
2587
2588 sk->sk_forward_alloc += amt << SK_MEM_QUANTUM_SHIFT;
2589 ret = __sk_mem_raise_allocated(sk, size, amt, kind);
2590 if (!ret)
2591 sk->sk_forward_alloc -= amt << SK_MEM_QUANTUM_SHIFT;
2592 return ret;
2593}
2594EXPORT_SYMBOL(__sk_mem_schedule);
2595
2596/**
2597 * __sk_mem_reduce_allocated - reclaim memory_allocated
2598 * @sk: socket
2599 * @amount: number of quanta
2600 *
2601 * Similar to __sk_mem_reclaim(), but does not update sk_forward_alloc
2602 */
2603void __sk_mem_reduce_allocated(struct sock *sk, int amount)
2604{
2605 sk_memory_allocated_sub(sk, amount);
2606
2607 if (mem_cgroup_sockets_enabled && sk->sk_memcg)
2608 mem_cgroup_uncharge_skmem(sk->sk_memcg, amount);
2609
2610 if (sk_under_memory_pressure(sk) &&
2611 (sk_memory_allocated(sk) < sk_prot_mem_limits(sk, 0)))
2612 sk_leave_memory_pressure(sk);
2613}
2614EXPORT_SYMBOL(__sk_mem_reduce_allocated);
2615
2616/**
2617 * __sk_mem_reclaim - reclaim sk_forward_alloc and memory_allocated
2618 * @sk: socket
2619 * @amount: number of bytes (rounded down to a SK_MEM_QUANTUM multiple)
2620 */
2621void __sk_mem_reclaim(struct sock *sk, int amount)
2622{
2623 amount >>= SK_MEM_QUANTUM_SHIFT;
2624 sk->sk_forward_alloc -= amount << SK_MEM_QUANTUM_SHIFT;
2625 __sk_mem_reduce_allocated(sk, amount);
2626}
2627EXPORT_SYMBOL(__sk_mem_reclaim);
2628
2629int sk_set_peek_off(struct sock *sk, int val)
2630{
2631 sk->sk_peek_off = val;
2632 return 0;
2633}
2634EXPORT_SYMBOL_GPL(sk_set_peek_off);
2635
2636/*
2637 * Set of default routines for initialising struct proto_ops when
2638 * the protocol does not support a particular function. In certain
2639 * cases where it makes no sense for a protocol to have a "do nothing"
2640 * function, some default processing is provided.
2641 */
2642
2643int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len)
2644{
2645 return -EOPNOTSUPP;
2646}
2647EXPORT_SYMBOL(sock_no_bind);
2648
2649int sock_no_connect(struct socket *sock, struct sockaddr *saddr,
2650 int len, int flags)
2651{
2652 return -EOPNOTSUPP;
2653}
2654EXPORT_SYMBOL(sock_no_connect);
2655
2656int sock_no_socketpair(struct socket *sock1, struct socket *sock2)
2657{
2658 return -EOPNOTSUPP;
2659}
2660EXPORT_SYMBOL(sock_no_socketpair);
2661
2662int sock_no_accept(struct socket *sock, struct socket *newsock, int flags,
2663 bool kern)
2664{
2665 return -EOPNOTSUPP;
2666}
2667EXPORT_SYMBOL(sock_no_accept);
2668
2669int sock_no_getname(struct socket *sock, struct sockaddr *saddr,
2670 int peer)
2671{
2672 return -EOPNOTSUPP;
2673}
2674EXPORT_SYMBOL(sock_no_getname);
2675
2676int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
2677{
2678 return -EOPNOTSUPP;
2679}
2680EXPORT_SYMBOL(sock_no_ioctl);
2681
2682int sock_no_listen(struct socket *sock, int backlog)
2683{
2684 return -EOPNOTSUPP;
2685}
2686EXPORT_SYMBOL(sock_no_listen);
2687
2688int sock_no_shutdown(struct socket *sock, int how)
2689{
2690 return -EOPNOTSUPP;
2691}
2692EXPORT_SYMBOL(sock_no_shutdown);
2693
2694int sock_no_setsockopt(struct socket *sock, int level, int optname,
2695 char __user *optval, unsigned int optlen)
2696{
2697 return -EOPNOTSUPP;
2698}
2699EXPORT_SYMBOL(sock_no_setsockopt);
2700
2701int sock_no_getsockopt(struct socket *sock, int level, int optname,
2702 char __user *optval, int __user *optlen)
2703{
2704 return -EOPNOTSUPP;
2705}
2706EXPORT_SYMBOL(sock_no_getsockopt);
2707
2708int sock_no_sendmsg(struct socket *sock, struct msghdr *m, size_t len)
2709{
2710 return -EOPNOTSUPP;
2711}
2712EXPORT_SYMBOL(sock_no_sendmsg);
2713
2714int sock_no_sendmsg_locked(struct sock *sk, struct msghdr *m, size_t len)
2715{
2716 return -EOPNOTSUPP;
2717}
2718EXPORT_SYMBOL(sock_no_sendmsg_locked);
2719
2720int sock_no_recvmsg(struct socket *sock, struct msghdr *m, size_t len,
2721 int flags)
2722{
2723 return -EOPNOTSUPP;
2724}
2725EXPORT_SYMBOL(sock_no_recvmsg);
2726
2727int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma)
2728{
2729 /* Mirror missing mmap method error code */
2730 return -ENODEV;
2731}
2732EXPORT_SYMBOL(sock_no_mmap);
2733
2734ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags)
2735{
2736 ssize_t res;
2737 struct msghdr msg = {.msg_flags = flags};
2738 struct kvec iov;
2739 char *kaddr = kmap(page);
2740 iov.iov_base = kaddr + offset;
2741 iov.iov_len = size;
2742 res = kernel_sendmsg(sock, &msg, &iov, 1, size);
2743 kunmap(page);
2744 return res;
2745}
2746EXPORT_SYMBOL(sock_no_sendpage);
2747
2748ssize_t sock_no_sendpage_locked(struct sock *sk, struct page *page,
2749 int offset, size_t size, int flags)
2750{
2751 ssize_t res;
2752 struct msghdr msg = {.msg_flags = flags};
2753 struct kvec iov;
2754 char *kaddr = kmap(page);
2755
2756 iov.iov_base = kaddr + offset;
2757 iov.iov_len = size;
2758 res = kernel_sendmsg_locked(sk, &msg, &iov, 1, size);
2759 kunmap(page);
2760 return res;
2761}
2762EXPORT_SYMBOL(sock_no_sendpage_locked);
2763
2764/*
2765 * Default Socket Callbacks
2766 */
2767
2768static void sock_def_wakeup(struct sock *sk)
2769{
2770 struct socket_wq *wq;
2771
2772 rcu_read_lock();
2773 wq = rcu_dereference(sk->sk_wq);
2774 if (skwq_has_sleeper(wq))
2775 wake_up_interruptible_all(&wq->wait);
2776 rcu_read_unlock();
2777}
2778
2779static void sock_def_error_report(struct sock *sk)
2780{
2781 struct socket_wq *wq;
2782
2783 rcu_read_lock();
2784 wq = rcu_dereference(sk->sk_wq);
2785 if (skwq_has_sleeper(wq))
2786 wake_up_interruptible_poll(&wq->wait, EPOLLERR);
2787 sk_wake_async(sk, SOCK_WAKE_IO, POLL_ERR);
2788 rcu_read_unlock();
2789}
2790
2791static void sock_def_readable(struct sock *sk)
2792{
2793 struct socket_wq *wq;
2794
2795 rcu_read_lock();
2796 wq = rcu_dereference(sk->sk_wq);
2797 if (skwq_has_sleeper(wq))
2798 wake_up_interruptible_sync_poll(&wq->wait, EPOLLIN | EPOLLPRI |
2799 EPOLLRDNORM | EPOLLRDBAND);
2800 sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN);
2801 rcu_read_unlock();
2802}
2803
2804static void sock_def_write_space(struct sock *sk)
2805{
2806 struct socket_wq *wq;
2807
2808 rcu_read_lock();
2809
2810 /* Do not wake up a writer until he can make "significant"
2811 * progress. --DaveM
2812 */
2813 if ((refcount_read(&sk->sk_wmem_alloc) << 1) <= READ_ONCE(sk->sk_sndbuf)) {
2814 wq = rcu_dereference(sk->sk_wq);
2815 if (skwq_has_sleeper(wq))
2816 wake_up_interruptible_sync_poll(&wq->wait, EPOLLOUT |
2817 EPOLLWRNORM | EPOLLWRBAND);
2818
2819 /* Should agree with poll, otherwise some programs break */
2820 if (sock_writeable(sk))
2821 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
2822 }
2823
2824 rcu_read_unlock();
2825}
2826
2827static void sock_def_destruct(struct sock *sk)
2828{
2829}
2830
2831void sk_send_sigurg(struct sock *sk)
2832{
2833 if (sk->sk_socket && sk->sk_socket->file)
2834 if (send_sigurg(&sk->sk_socket->file->f_owner))
2835 sk_wake_async(sk, SOCK_WAKE_URG, POLL_PRI);
2836}
2837EXPORT_SYMBOL(sk_send_sigurg);
2838
2839void sk_reset_timer(struct sock *sk, struct timer_list* timer,
2840 unsigned long expires)
2841{
2842 if (!mod_timer(timer, expires))
2843 sock_hold(sk);
2844}
2845EXPORT_SYMBOL(sk_reset_timer);
2846
2847void sk_stop_timer(struct sock *sk, struct timer_list* timer)
2848{
2849 if (del_timer(timer))
2850 __sock_put(sk);
2851}
2852EXPORT_SYMBOL(sk_stop_timer);
2853
2854void sock_init_data(struct socket *sock, struct sock *sk)
2855{
2856 sk_init_common(sk);
2857 sk->sk_send_head = NULL;
2858
2859 timer_setup(&sk->sk_timer, NULL, 0);
2860
2861 sk->sk_allocation = GFP_KERNEL;
2862 sk->sk_rcvbuf = sysctl_rmem_default;
2863 sk->sk_sndbuf = sysctl_wmem_default;
2864 sk->sk_state = TCP_CLOSE;
2865 sk_set_socket(sk, sock);
2866
2867 sock_set_flag(sk, SOCK_ZAPPED);
2868
2869 if (sock) {
2870 sk->sk_type = sock->type;
2871 RCU_INIT_POINTER(sk->sk_wq, &sock->wq);
2872 sock->sk = sk;
2873 sk->sk_uid = SOCK_INODE(sock)->i_uid;
2874 } else {
2875 RCU_INIT_POINTER(sk->sk_wq, NULL);
2876 sk->sk_uid = make_kuid(sock_net(sk)->user_ns, 0);
2877 }
2878
2879 rwlock_init(&sk->sk_callback_lock);
2880 if (sk->sk_kern_sock)
2881 lockdep_set_class_and_name(
2882 &sk->sk_callback_lock,
2883 af_kern_callback_keys + sk->sk_family,
2884 af_family_kern_clock_key_strings[sk->sk_family]);
2885 else
2886 lockdep_set_class_and_name(
2887 &sk->sk_callback_lock,
2888 af_callback_keys + sk->sk_family,
2889 af_family_clock_key_strings[sk->sk_family]);
2890
2891 sk->sk_state_change = sock_def_wakeup;
2892 sk->sk_data_ready = sock_def_readable;
2893 sk->sk_write_space = sock_def_write_space;
2894 sk->sk_error_report = sock_def_error_report;
2895 sk->sk_destruct = sock_def_destruct;
2896
2897 sk->sk_frag.page = NULL;
2898 sk->sk_frag.offset = 0;
2899 sk->sk_peek_off = -1;
2900
2901 sk->sk_peer_pid = NULL;
2902 sk->sk_peer_cred = NULL;
2903 sk->sk_write_pending = 0;
2904 sk->sk_rcvlowat = 1;
2905 sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT;
2906 sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT;
2907
2908 sk->sk_stamp = SK_DEFAULT_STAMP;
2909#if BITS_PER_LONG==32
2910 seqlock_init(&sk->sk_stamp_seq);
2911#endif
2912 atomic_set(&sk->sk_zckey, 0);
2913
2914#ifdef CONFIG_NET_RX_BUSY_POLL
2915 sk->sk_napi_id = 0;
2916 sk->sk_ll_usec = sysctl_net_busy_read;
2917#endif
2918
2919 sk->sk_max_pacing_rate = ~0UL;
2920 sk->sk_pacing_rate = ~0UL;
2921 sk->sk_pacing_shift = 10;
2922 sk->sk_incoming_cpu = -1;
2923
2924 sk_rx_queue_clear(sk);
2925 /*
2926 * Before updating sk_refcnt, we must commit prior changes to memory
2927 * (Documentation/RCU/rculist_nulls.txt for details)
2928 */
2929 smp_wmb();
2930 refcount_set(&sk->sk_refcnt, 1);
2931 atomic_set(&sk->sk_drops, 0);
2932}
2933EXPORT_SYMBOL(sock_init_data);
2934
2935void lock_sock_nested(struct sock *sk, int subclass)
2936{
2937 might_sleep();
2938 spin_lock_bh(&sk->sk_lock.slock);
2939 if (sk->sk_lock.owned)
2940 __lock_sock(sk);
2941 sk->sk_lock.owned = 1;
2942 spin_unlock(&sk->sk_lock.slock);
2943 /*
2944 * The sk_lock has mutex_lock() semantics here:
2945 */
2946 mutex_acquire(&sk->sk_lock.dep_map, subclass, 0, _RET_IP_);
2947 local_bh_enable();
2948}
2949EXPORT_SYMBOL(lock_sock_nested);
2950
2951void release_sock(struct sock *sk)
2952{
2953 spin_lock_bh(&sk->sk_lock.slock);
2954 if (sk->sk_backlog.tail)
2955 __release_sock(sk);
2956
2957 /* Warning : release_cb() might need to release sk ownership,
2958 * ie call sock_release_ownership(sk) before us.
2959 */
2960 if (sk->sk_prot->release_cb)
2961 sk->sk_prot->release_cb(sk);
2962
2963 sock_release_ownership(sk);
2964 if (waitqueue_active(&sk->sk_lock.wq))
2965 wake_up(&sk->sk_lock.wq);
2966 spin_unlock_bh(&sk->sk_lock.slock);
2967}
2968EXPORT_SYMBOL(release_sock);
2969
2970/**
2971 * lock_sock_fast - fast version of lock_sock
2972 * @sk: socket
2973 *
2974 * This version should be used for very small section, where process wont block
2975 * return false if fast path is taken:
2976 *
2977 * sk_lock.slock locked, owned = 0, BH disabled
2978 *
2979 * return true if slow path is taken:
2980 *
2981 * sk_lock.slock unlocked, owned = 1, BH enabled
2982 */
2983bool lock_sock_fast(struct sock *sk)
2984{
2985 might_sleep();
2986 spin_lock_bh(&sk->sk_lock.slock);
2987
2988 if (!sk->sk_lock.owned)
2989 /*
2990 * Note : We must disable BH
2991 */
2992 return false;
2993
2994 __lock_sock(sk);
2995 sk->sk_lock.owned = 1;
2996 spin_unlock(&sk->sk_lock.slock);
2997 /*
2998 * The sk_lock has mutex_lock() semantics here:
2999 */
3000 mutex_acquire(&sk->sk_lock.dep_map, 0, 0, _RET_IP_);
3001 local_bh_enable();
3002 return true;
3003}
3004EXPORT_SYMBOL(lock_sock_fast);
3005
3006int sock_gettstamp(struct socket *sock, void __user *userstamp,
3007 bool timeval, bool time32)
3008{
3009 struct sock *sk = sock->sk;
3010 struct timespec64 ts;
3011
3012 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
3013 ts = ktime_to_timespec64(sock_read_timestamp(sk));
3014 if (ts.tv_sec == -1)
3015 return -ENOENT;
3016 if (ts.tv_sec == 0) {
3017 ktime_t kt = ktime_get_real();
3018 sock_write_timestamp(sk, kt);;
3019 ts = ktime_to_timespec64(kt);
3020 }
3021
3022 if (timeval)
3023 ts.tv_nsec /= 1000;
3024
3025#ifdef CONFIG_COMPAT_32BIT_TIME
3026 if (time32)
3027 return put_old_timespec32(&ts, userstamp);
3028#endif
3029#ifdef CONFIG_SPARC64
3030 /* beware of padding in sparc64 timeval */
3031 if (timeval && !in_compat_syscall()) {
3032 struct __kernel_old_timeval __user tv = {
3033 .tv_sec = ts.tv_sec,
3034 .tv_usec = ts.tv_nsec,
3035 };
3036 if (copy_to_user(userstamp, &tv, sizeof(tv)))
3037 return -EFAULT;
3038 return 0;
3039 }
3040#endif
3041 return put_timespec64(&ts, userstamp);
3042}
3043EXPORT_SYMBOL(sock_gettstamp);
3044
3045void sock_enable_timestamp(struct sock *sk, int flag)
3046{
3047 if (!sock_flag(sk, flag)) {
3048 unsigned long previous_flags = sk->sk_flags;
3049
3050 sock_set_flag(sk, flag);
3051 /*
3052 * we just set one of the two flags which require net
3053 * time stamping, but time stamping might have been on
3054 * already because of the other one
3055 */
3056 if (sock_needs_netstamp(sk) &&
3057 !(previous_flags & SK_FLAGS_TIMESTAMP))
3058 net_enable_timestamp();
3059 }
3060}
3061
3062int sock_recv_errqueue(struct sock *sk, struct msghdr *msg, int len,
3063 int level, int type)
3064{
3065 struct sock_exterr_skb *serr;
3066 struct sk_buff *skb;
3067 int copied, err;
3068
3069 err = -EAGAIN;
3070 skb = sock_dequeue_err_skb(sk);
3071 if (skb == NULL)
3072 goto out;
3073
3074 copied = skb->len;
3075 if (copied > len) {
3076 msg->msg_flags |= MSG_TRUNC;
3077 copied = len;
3078 }
3079 err = skb_copy_datagram_msg(skb, 0, msg, copied);
3080 if (err)
3081 goto out_free_skb;
3082
3083 sock_recv_timestamp(msg, sk, skb);
3084
3085 serr = SKB_EXT_ERR(skb);
3086 put_cmsg(msg, level, type, sizeof(serr->ee), &serr->ee);
3087
3088 msg->msg_flags |= MSG_ERRQUEUE;
3089 err = copied;
3090
3091out_free_skb:
3092 kfree_skb(skb);
3093out:
3094 return err;
3095}
3096EXPORT_SYMBOL(sock_recv_errqueue);
3097
3098/*
3099 * Get a socket option on an socket.
3100 *
3101 * FIX: POSIX 1003.1g is very ambiguous here. It states that
3102 * asynchronous errors should be reported by getsockopt. We assume
3103 * this means if you specify SO_ERROR (otherwise whats the point of it).
3104 */
3105int sock_common_getsockopt(struct socket *sock, int level, int optname,
3106 char __user *optval, int __user *optlen)
3107{
3108 struct sock *sk = sock->sk;
3109
3110 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
3111}
3112EXPORT_SYMBOL(sock_common_getsockopt);
3113
3114#ifdef CONFIG_COMPAT
3115int compat_sock_common_getsockopt(struct socket *sock, int level, int optname,
3116 char __user *optval, int __user *optlen)
3117{
3118 struct sock *sk = sock->sk;
3119
3120 if (sk->sk_prot->compat_getsockopt != NULL)
3121 return sk->sk_prot->compat_getsockopt(sk, level, optname,
3122 optval, optlen);
3123 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
3124}
3125EXPORT_SYMBOL(compat_sock_common_getsockopt);
3126#endif
3127
3128int sock_common_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
3129 int flags)
3130{
3131 struct sock *sk = sock->sk;
3132 int addr_len = 0;
3133 int err;
3134
3135 err = sk->sk_prot->recvmsg(sk, msg, size, flags & MSG_DONTWAIT,
3136 flags & ~MSG_DONTWAIT, &addr_len);
3137 if (err >= 0)
3138 msg->msg_namelen = addr_len;
3139 return err;
3140}
3141EXPORT_SYMBOL(sock_common_recvmsg);
3142
3143/*
3144 * Set socket options on an inet socket.
3145 */
3146int sock_common_setsockopt(struct socket *sock, int level, int optname,
3147 char __user *optval, unsigned int optlen)
3148{
3149 struct sock *sk = sock->sk;
3150
3151 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
3152}
3153EXPORT_SYMBOL(sock_common_setsockopt);
3154
3155#ifdef CONFIG_COMPAT
3156int compat_sock_common_setsockopt(struct socket *sock, int level, int optname,
3157 char __user *optval, unsigned int optlen)
3158{
3159 struct sock *sk = sock->sk;
3160
3161 if (sk->sk_prot->compat_setsockopt != NULL)
3162 return sk->sk_prot->compat_setsockopt(sk, level, optname,
3163 optval, optlen);
3164 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
3165}
3166EXPORT_SYMBOL(compat_sock_common_setsockopt);
3167#endif
3168
3169void sk_common_release(struct sock *sk)
3170{
3171 if (sk->sk_prot->destroy)
3172 sk->sk_prot->destroy(sk);
3173
3174 /*
3175 * Observation: when sock_common_release is called, processes have
3176 * no access to socket. But net still has.
3177 * Step one, detach it from networking:
3178 *
3179 * A. Remove from hash tables.
3180 */
3181
3182 sk->sk_prot->unhash(sk);
3183
3184 /*
3185 * In this point socket cannot receive new packets, but it is possible
3186 * that some packets are in flight because some CPU runs receiver and
3187 * did hash table lookup before we unhashed socket. They will achieve
3188 * receive queue and will be purged by socket destructor.
3189 *
3190 * Also we still have packets pending on receive queue and probably,
3191 * our own packets waiting in device queues. sock_destroy will drain
3192 * receive queue, but transmitted packets will delay socket destruction
3193 * until the last reference will be released.
3194 */
3195
3196 sock_orphan(sk);
3197
3198 xfrm_sk_free_policy(sk);
3199
3200 sk_refcnt_debug_release(sk);
3201
3202 sock_put(sk);
3203}
3204EXPORT_SYMBOL(sk_common_release);
3205
3206void sk_get_meminfo(const struct sock *sk, u32 *mem)
3207{
3208 memset(mem, 0, sizeof(*mem) * SK_MEMINFO_VARS);
3209
3210 mem[SK_MEMINFO_RMEM_ALLOC] = sk_rmem_alloc_get(sk);
3211 mem[SK_MEMINFO_RCVBUF] = READ_ONCE(sk->sk_rcvbuf);
3212 mem[SK_MEMINFO_WMEM_ALLOC] = sk_wmem_alloc_get(sk);
3213 mem[SK_MEMINFO_SNDBUF] = READ_ONCE(sk->sk_sndbuf);
3214 mem[SK_MEMINFO_FWD_ALLOC] = sk->sk_forward_alloc;
3215 mem[SK_MEMINFO_WMEM_QUEUED] = READ_ONCE(sk->sk_wmem_queued);
3216 mem[SK_MEMINFO_OPTMEM] = atomic_read(&sk->sk_omem_alloc);
3217 mem[SK_MEMINFO_BACKLOG] = READ_ONCE(sk->sk_backlog.len);
3218 mem[SK_MEMINFO_DROPS] = atomic_read(&sk->sk_drops);
3219}
3220
3221#ifdef CONFIG_PROC_FS
3222#define PROTO_INUSE_NR 64 /* should be enough for the first time */
3223struct prot_inuse {
3224 int val[PROTO_INUSE_NR];
3225};
3226
3227static DECLARE_BITMAP(proto_inuse_idx, PROTO_INUSE_NR);
3228
3229void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
3230{
3231 __this_cpu_add(net->core.prot_inuse->val[prot->inuse_idx], val);
3232}
3233EXPORT_SYMBOL_GPL(sock_prot_inuse_add);
3234
3235int sock_prot_inuse_get(struct net *net, struct proto *prot)
3236{
3237 int cpu, idx = prot->inuse_idx;
3238 int res = 0;
3239
3240 for_each_possible_cpu(cpu)
3241 res += per_cpu_ptr(net->core.prot_inuse, cpu)->val[idx];
3242
3243 return res >= 0 ? res : 0;
3244}
3245EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
3246
3247static void sock_inuse_add(struct net *net, int val)
3248{
3249 this_cpu_add(*net->core.sock_inuse, val);
3250}
3251
3252int sock_inuse_get(struct net *net)
3253{
3254 int cpu, res = 0;
3255
3256 for_each_possible_cpu(cpu)
3257 res += *per_cpu_ptr(net->core.sock_inuse, cpu);
3258
3259 return res;
3260}
3261
3262EXPORT_SYMBOL_GPL(sock_inuse_get);
3263
3264static int __net_init sock_inuse_init_net(struct net *net)
3265{
3266 net->core.prot_inuse = alloc_percpu(struct prot_inuse);
3267 if (net->core.prot_inuse == NULL)
3268 return -ENOMEM;
3269
3270 net->core.sock_inuse = alloc_percpu(int);
3271 if (net->core.sock_inuse == NULL)
3272 goto out;
3273
3274 return 0;
3275
3276out:
3277 free_percpu(net->core.prot_inuse);
3278 return -ENOMEM;
3279}
3280
3281static void __net_exit sock_inuse_exit_net(struct net *net)
3282{
3283 free_percpu(net->core.prot_inuse);
3284 free_percpu(net->core.sock_inuse);
3285}
3286
3287static struct pernet_operations net_inuse_ops = {
3288 .init = sock_inuse_init_net,
3289 .exit = sock_inuse_exit_net,
3290};
3291
3292static __init int net_inuse_init(void)
3293{
3294 if (register_pernet_subsys(&net_inuse_ops))
3295 panic("Cannot initialize net inuse counters");
3296
3297 return 0;
3298}
3299
3300core_initcall(net_inuse_init);
3301
3302static int assign_proto_idx(struct proto *prot)
3303{
3304 prot->inuse_idx = find_first_zero_bit(proto_inuse_idx, PROTO_INUSE_NR);
3305
3306 if (unlikely(prot->inuse_idx == PROTO_INUSE_NR - 1)) {
3307 pr_err("PROTO_INUSE_NR exhausted\n");
3308 return -ENOSPC;
3309 }
3310
3311 set_bit(prot->inuse_idx, proto_inuse_idx);
3312 return 0;
3313}
3314
3315static void release_proto_idx(struct proto *prot)
3316{
3317 if (prot->inuse_idx != PROTO_INUSE_NR - 1)
3318 clear_bit(prot->inuse_idx, proto_inuse_idx);
3319}
3320#else
3321static inline int assign_proto_idx(struct proto *prot)
3322{
3323 return 0;
3324}
3325
3326static inline void release_proto_idx(struct proto *prot)
3327{
3328}
3329
3330static void sock_inuse_add(struct net *net, int val)
3331{
3332}
3333#endif
3334
3335static void req_prot_cleanup(struct request_sock_ops *rsk_prot)
3336{
3337 if (!rsk_prot)
3338 return;
3339 kfree(rsk_prot->slab_name);
3340 rsk_prot->slab_name = NULL;
3341 kmem_cache_destroy(rsk_prot->slab);
3342 rsk_prot->slab = NULL;
3343}
3344
3345static int req_prot_init(const struct proto *prot)
3346{
3347 struct request_sock_ops *rsk_prot = prot->rsk_prot;
3348
3349 if (!rsk_prot)
3350 return 0;
3351
3352 rsk_prot->slab_name = kasprintf(GFP_KERNEL, "request_sock_%s",
3353 prot->name);
3354 if (!rsk_prot->slab_name)
3355 return -ENOMEM;
3356
3357 rsk_prot->slab = kmem_cache_create(rsk_prot->slab_name,
3358 rsk_prot->obj_size, 0,
3359 SLAB_ACCOUNT | prot->slab_flags,
3360 NULL);
3361
3362 if (!rsk_prot->slab) {
3363 pr_crit("%s: Can't create request sock SLAB cache!\n",
3364 prot->name);
3365 return -ENOMEM;
3366 }
3367 return 0;
3368}
3369
3370int proto_register(struct proto *prot, int alloc_slab)
3371{
3372 int ret = -ENOBUFS;
3373
3374 if (alloc_slab) {
3375 prot->slab = kmem_cache_create_usercopy(prot->name,
3376 prot->obj_size, 0,
3377 SLAB_HWCACHE_ALIGN | SLAB_ACCOUNT |
3378 prot->slab_flags,
3379 prot->useroffset, prot->usersize,
3380 NULL);
3381
3382 if (prot->slab == NULL) {
3383 pr_crit("%s: Can't create sock SLAB cache!\n",
3384 prot->name);
3385 goto out;
3386 }
3387
3388 if (req_prot_init(prot))
3389 goto out_free_request_sock_slab;
3390
3391 if (prot->twsk_prot != NULL) {
3392 prot->twsk_prot->twsk_slab_name = kasprintf(GFP_KERNEL, "tw_sock_%s", prot->name);
3393
3394 if (prot->twsk_prot->twsk_slab_name == NULL)
3395 goto out_free_request_sock_slab;
3396
3397 prot->twsk_prot->twsk_slab =
3398 kmem_cache_create(prot->twsk_prot->twsk_slab_name,
3399 prot->twsk_prot->twsk_obj_size,
3400 0,
3401 SLAB_ACCOUNT |
3402 prot->slab_flags,
3403 NULL);
3404 if (prot->twsk_prot->twsk_slab == NULL)
3405 goto out_free_timewait_sock_slab_name;
3406 }
3407 }
3408
3409 mutex_lock(&proto_list_mutex);
3410 ret = assign_proto_idx(prot);
3411 if (ret) {
3412 mutex_unlock(&proto_list_mutex);
3413 goto out_free_timewait_sock_slab_name;
3414 }
3415 list_add(&prot->node, &proto_list);
3416 mutex_unlock(&proto_list_mutex);
3417 return ret;
3418
3419out_free_timewait_sock_slab_name:
3420 if (alloc_slab && prot->twsk_prot)
3421 kfree(prot->twsk_prot->twsk_slab_name);
3422out_free_request_sock_slab:
3423 if (alloc_slab) {
3424 req_prot_cleanup(prot->rsk_prot);
3425
3426 kmem_cache_destroy(prot->slab);
3427 prot->slab = NULL;
3428 }
3429out:
3430 return ret;
3431}
3432EXPORT_SYMBOL(proto_register);
3433
3434void proto_unregister(struct proto *prot)
3435{
3436 mutex_lock(&proto_list_mutex);
3437 release_proto_idx(prot);
3438 list_del(&prot->node);
3439 mutex_unlock(&proto_list_mutex);
3440
3441 kmem_cache_destroy(prot->slab);
3442 prot->slab = NULL;
3443
3444 req_prot_cleanup(prot->rsk_prot);
3445
3446 if (prot->twsk_prot != NULL && prot->twsk_prot->twsk_slab != NULL) {
3447 kmem_cache_destroy(prot->twsk_prot->twsk_slab);
3448 kfree(prot->twsk_prot->twsk_slab_name);
3449 prot->twsk_prot->twsk_slab = NULL;
3450 }
3451}
3452EXPORT_SYMBOL(proto_unregister);
3453
3454int sock_load_diag_module(int family, int protocol)
3455{
3456 if (!protocol) {
3457 if (!sock_is_registered(family))
3458 return -ENOENT;
3459
3460 return request_module("net-pf-%d-proto-%d-type-%d", PF_NETLINK,
3461 NETLINK_SOCK_DIAG, family);
3462 }
3463
3464#ifdef CONFIG_INET
3465 if (family == AF_INET &&
3466 protocol != IPPROTO_RAW &&
3467 !rcu_access_pointer(inet_protos[protocol]))
3468 return -ENOENT;
3469#endif
3470
3471 return request_module("net-pf-%d-proto-%d-type-%d-%d", PF_NETLINK,
3472 NETLINK_SOCK_DIAG, family, protocol);
3473}
3474EXPORT_SYMBOL(sock_load_diag_module);
3475
3476#ifdef CONFIG_PROC_FS
3477static void *proto_seq_start(struct seq_file *seq, loff_t *pos)
3478 __acquires(proto_list_mutex)
3479{
3480 mutex_lock(&proto_list_mutex);
3481 return seq_list_start_head(&proto_list, *pos);
3482}
3483
3484static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3485{
3486 return seq_list_next(v, &proto_list, pos);
3487}
3488
3489static void proto_seq_stop(struct seq_file *seq, void *v)
3490 __releases(proto_list_mutex)
3491{
3492 mutex_unlock(&proto_list_mutex);
3493}
3494
3495static char proto_method_implemented(const void *method)
3496{
3497 return method == NULL ? 'n' : 'y';
3498}
3499static long sock_prot_memory_allocated(struct proto *proto)
3500{
3501 return proto->memory_allocated != NULL ? proto_memory_allocated(proto) : -1L;
3502}
3503
3504static const char *sock_prot_memory_pressure(struct proto *proto)
3505{
3506 return proto->memory_pressure != NULL ?
3507 proto_memory_pressure(proto) ? "yes" : "no" : "NI";
3508}
3509
3510static void proto_seq_printf(struct seq_file *seq, struct proto *proto)
3511{
3512
3513 seq_printf(seq, "%-9s %4u %6d %6ld %-3s %6u %-3s %-10s "
3514 "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n",
3515 proto->name,
3516 proto->obj_size,
3517 sock_prot_inuse_get(seq_file_net(seq), proto),
3518 sock_prot_memory_allocated(proto),
3519 sock_prot_memory_pressure(proto),
3520 proto->max_header,
3521 proto->slab == NULL ? "no" : "yes",
3522 module_name(proto->owner),
3523 proto_method_implemented(proto->close),
3524 proto_method_implemented(proto->connect),
3525 proto_method_implemented(proto->disconnect),
3526 proto_method_implemented(proto->accept),
3527 proto_method_implemented(proto->ioctl),
3528 proto_method_implemented(proto->init),
3529 proto_method_implemented(proto->destroy),
3530 proto_method_implemented(proto->shutdown),
3531 proto_method_implemented(proto->setsockopt),
3532 proto_method_implemented(proto->getsockopt),
3533 proto_method_implemented(proto->sendmsg),
3534 proto_method_implemented(proto->recvmsg),
3535 proto_method_implemented(proto->sendpage),
3536 proto_method_implemented(proto->bind),
3537 proto_method_implemented(proto->backlog_rcv),
3538 proto_method_implemented(proto->hash),
3539 proto_method_implemented(proto->unhash),
3540 proto_method_implemented(proto->get_port),
3541 proto_method_implemented(proto->enter_memory_pressure));
3542}
3543
3544static int proto_seq_show(struct seq_file *seq, void *v)
3545{
3546 if (v == &proto_list)
3547 seq_printf(seq, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s",
3548 "protocol",
3549 "size",
3550 "sockets",
3551 "memory",
3552 "press",
3553 "maxhdr",
3554 "slab",
3555 "module",
3556 "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n");
3557 else
3558 proto_seq_printf(seq, list_entry(v, struct proto, node));
3559 return 0;
3560}
3561
3562static const struct seq_operations proto_seq_ops = {
3563 .start = proto_seq_start,
3564 .next = proto_seq_next,
3565 .stop = proto_seq_stop,
3566 .show = proto_seq_show,
3567};
3568
3569static __net_init int proto_init_net(struct net *net)
3570{
3571 if (!proc_create_net("protocols", 0444, net->proc_net, &proto_seq_ops,
3572 sizeof(struct seq_net_private)))
3573 return -ENOMEM;
3574
3575 return 0;
3576}
3577
3578static __net_exit void proto_exit_net(struct net *net)
3579{
3580 remove_proc_entry("protocols", net->proc_net);
3581}
3582
3583
3584static __net_initdata struct pernet_operations proto_net_ops = {
3585 .init = proto_init_net,
3586 .exit = proto_exit_net,
3587};
3588
3589static int __init proto_init(void)
3590{
3591 return register_pernet_subsys(&proto_net_ops);
3592}
3593
3594subsys_initcall(proto_init);
3595
3596#endif /* PROC_FS */
3597
3598#ifdef CONFIG_NET_RX_BUSY_POLL
3599bool sk_busy_loop_end(void *p, unsigned long start_time)
3600{
3601 struct sock *sk = p;
3602
3603 return !skb_queue_empty_lockless(&sk->sk_receive_queue) ||
3604 sk_busy_loop_timeout(sk, start_time);
3605}
3606EXPORT_SYMBOL(sk_busy_loop_end);
3607#endif /* CONFIG_NET_RX_BUSY_POLL */