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.
6 * Generic socket support routines. Memory allocators, socket lock/release
7 * handler for protocols to use and generic option handler.
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>
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
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
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
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.
92 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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>
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/timer.h>
106 #include <linux/string.h>
107 #include <linux/sockios.h>
108 #include <linux/net.h>
109 #include <linux/mm.h>
110 #include <linux/slab.h>
111 #include <linux/interrupt.h>
112 #include <linux/poll.h>
113 #include <linux/tcp.h>
114 #include <linux/init.h>
115 #include <linux/highmem.h>
116 #include <linux/user_namespace.h>
117 #include <linux/static_key.h>
118 #include <linux/memcontrol.h>
119 #include <linux/prefetch.h>
121 #include <asm/uaccess.h>
123 #include <linux/netdevice.h>
124 #include <net/protocol.h>
125 #include <linux/skbuff.h>
126 #include <net/net_namespace.h>
127 #include <net/request_sock.h>
128 #include <net/sock.h>
129 #include <linux/net_tstamp.h>
130 #include <net/xfrm.h>
131 #include <linux/ipsec.h>
132 #include <net/cls_cgroup.h>
133 #include <net/netprio_cgroup.h>
135 #include <linux/filter.h>
137 #include <trace/events/sock.h>
143 #include <net/busy_poll.h>
145 static DEFINE_MUTEX(proto_list_mutex);
146 static LIST_HEAD(proto_list);
148 #ifdef CONFIG_MEMCG_KMEM
149 int mem_cgroup_sockets_init(struct mem_cgroup *memcg, struct cgroup_subsys *ss)
154 mutex_lock(&proto_list_mutex);
155 list_for_each_entry(proto, &proto_list, node) {
156 if (proto->init_cgroup) {
157 ret = proto->init_cgroup(memcg, ss);
163 mutex_unlock(&proto_list_mutex);
166 list_for_each_entry_continue_reverse(proto, &proto_list, node)
167 if (proto->destroy_cgroup)
168 proto->destroy_cgroup(memcg);
169 mutex_unlock(&proto_list_mutex);
173 void mem_cgroup_sockets_destroy(struct mem_cgroup *memcg)
177 mutex_lock(&proto_list_mutex);
178 list_for_each_entry_reverse(proto, &proto_list, node)
179 if (proto->destroy_cgroup)
180 proto->destroy_cgroup(memcg);
181 mutex_unlock(&proto_list_mutex);
186 * Each address family might have different locking rules, so we have
187 * one slock key per address family:
189 static struct lock_class_key af_family_keys[AF_MAX];
190 static struct lock_class_key af_family_slock_keys[AF_MAX];
192 #if defined(CONFIG_MEMCG_KMEM)
193 struct static_key memcg_socket_limit_enabled;
194 EXPORT_SYMBOL(memcg_socket_limit_enabled);
198 * Make lock validator output more readable. (we pre-construct these
199 * strings build-time, so that runtime initialization of socket
202 static const char *const af_family_key_strings[AF_MAX+1] = {
203 "sk_lock-AF_UNSPEC", "sk_lock-AF_UNIX" , "sk_lock-AF_INET" ,
204 "sk_lock-AF_AX25" , "sk_lock-AF_IPX" , "sk_lock-AF_APPLETALK",
205 "sk_lock-AF_NETROM", "sk_lock-AF_BRIDGE" , "sk_lock-AF_ATMPVC" ,
206 "sk_lock-AF_X25" , "sk_lock-AF_INET6" , "sk_lock-AF_ROSE" ,
207 "sk_lock-AF_DECnet", "sk_lock-AF_NETBEUI" , "sk_lock-AF_SECURITY" ,
208 "sk_lock-AF_KEY" , "sk_lock-AF_NETLINK" , "sk_lock-AF_PACKET" ,
209 "sk_lock-AF_ASH" , "sk_lock-AF_ECONET" , "sk_lock-AF_ATMSVC" ,
210 "sk_lock-AF_RDS" , "sk_lock-AF_SNA" , "sk_lock-AF_IRDA" ,
211 "sk_lock-AF_PPPOX" , "sk_lock-AF_WANPIPE" , "sk_lock-AF_LLC" ,
212 "sk_lock-27" , "sk_lock-28" , "sk_lock-AF_CAN" ,
213 "sk_lock-AF_TIPC" , "sk_lock-AF_BLUETOOTH", "sk_lock-IUCV" ,
214 "sk_lock-AF_RXRPC" , "sk_lock-AF_ISDN" , "sk_lock-AF_PHONET" ,
215 "sk_lock-AF_IEEE802154", "sk_lock-AF_CAIF" , "sk_lock-AF_ALG" ,
216 "sk_lock-AF_NFC" , "sk_lock-AF_VSOCK" , "sk_lock-AF_MAX"
218 static const char *const af_family_slock_key_strings[AF_MAX+1] = {
219 "slock-AF_UNSPEC", "slock-AF_UNIX" , "slock-AF_INET" ,
220 "slock-AF_AX25" , "slock-AF_IPX" , "slock-AF_APPLETALK",
221 "slock-AF_NETROM", "slock-AF_BRIDGE" , "slock-AF_ATMPVC" ,
222 "slock-AF_X25" , "slock-AF_INET6" , "slock-AF_ROSE" ,
223 "slock-AF_DECnet", "slock-AF_NETBEUI" , "slock-AF_SECURITY" ,
224 "slock-AF_KEY" , "slock-AF_NETLINK" , "slock-AF_PACKET" ,
225 "slock-AF_ASH" , "slock-AF_ECONET" , "slock-AF_ATMSVC" ,
226 "slock-AF_RDS" , "slock-AF_SNA" , "slock-AF_IRDA" ,
227 "slock-AF_PPPOX" , "slock-AF_WANPIPE" , "slock-AF_LLC" ,
228 "slock-27" , "slock-28" , "slock-AF_CAN" ,
229 "slock-AF_TIPC" , "slock-AF_BLUETOOTH", "slock-AF_IUCV" ,
230 "slock-AF_RXRPC" , "slock-AF_ISDN" , "slock-AF_PHONET" ,
231 "slock-AF_IEEE802154", "slock-AF_CAIF" , "slock-AF_ALG" ,
232 "slock-AF_NFC" , "slock-AF_VSOCK" ,"slock-AF_MAX"
234 static const char *const af_family_clock_key_strings[AF_MAX+1] = {
235 "clock-AF_UNSPEC", "clock-AF_UNIX" , "clock-AF_INET" ,
236 "clock-AF_AX25" , "clock-AF_IPX" , "clock-AF_APPLETALK",
237 "clock-AF_NETROM", "clock-AF_BRIDGE" , "clock-AF_ATMPVC" ,
238 "clock-AF_X25" , "clock-AF_INET6" , "clock-AF_ROSE" ,
239 "clock-AF_DECnet", "clock-AF_NETBEUI" , "clock-AF_SECURITY" ,
240 "clock-AF_KEY" , "clock-AF_NETLINK" , "clock-AF_PACKET" ,
241 "clock-AF_ASH" , "clock-AF_ECONET" , "clock-AF_ATMSVC" ,
242 "clock-AF_RDS" , "clock-AF_SNA" , "clock-AF_IRDA" ,
243 "clock-AF_PPPOX" , "clock-AF_WANPIPE" , "clock-AF_LLC" ,
244 "clock-27" , "clock-28" , "clock-AF_CAN" ,
245 "clock-AF_TIPC" , "clock-AF_BLUETOOTH", "clock-AF_IUCV" ,
246 "clock-AF_RXRPC" , "clock-AF_ISDN" , "clock-AF_PHONET" ,
247 "clock-AF_IEEE802154", "clock-AF_CAIF" , "clock-AF_ALG" ,
248 "clock-AF_NFC" , "clock-AF_VSOCK" , "clock-AF_MAX"
252 * sk_callback_lock locking rules are per-address-family,
253 * so split the lock classes by using a per-AF key:
255 static struct lock_class_key af_callback_keys[AF_MAX];
257 /* Take into consideration the size of the struct sk_buff overhead in the
258 * determination of these values, since that is non-constant across
259 * platforms. This makes socket queueing behavior and performance
260 * not depend upon such differences.
262 #define _SK_MEM_PACKETS 256
263 #define _SK_MEM_OVERHEAD SKB_TRUESIZE(256)
264 #define SK_WMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS)
265 #define SK_RMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS)
267 /* Run time adjustable parameters. */
268 __u32 sysctl_wmem_max __read_mostly = SK_WMEM_MAX;
269 EXPORT_SYMBOL(sysctl_wmem_max);
270 __u32 sysctl_rmem_max __read_mostly = SK_RMEM_MAX;
271 EXPORT_SYMBOL(sysctl_rmem_max);
272 __u32 sysctl_wmem_default __read_mostly = SK_WMEM_MAX;
273 __u32 sysctl_rmem_default __read_mostly = SK_RMEM_MAX;
275 /* Maximal space eaten by iovec or ancillary data plus some space */
276 int sysctl_optmem_max __read_mostly = sizeof(unsigned long)*(2*UIO_MAXIOV+512);
277 EXPORT_SYMBOL(sysctl_optmem_max);
279 struct static_key memalloc_socks = STATIC_KEY_INIT_FALSE;
280 EXPORT_SYMBOL_GPL(memalloc_socks);
283 * sk_set_memalloc - sets %SOCK_MEMALLOC
284 * @sk: socket to set it on
286 * Set %SOCK_MEMALLOC on a socket for access to emergency reserves.
287 * It's the responsibility of the admin to adjust min_free_kbytes
288 * to meet the requirements
290 void sk_set_memalloc(struct sock *sk)
292 sock_set_flag(sk, SOCK_MEMALLOC);
293 sk->sk_allocation |= __GFP_MEMALLOC;
294 static_key_slow_inc(&memalloc_socks);
296 EXPORT_SYMBOL_GPL(sk_set_memalloc);
298 void sk_clear_memalloc(struct sock *sk)
300 sock_reset_flag(sk, SOCK_MEMALLOC);
301 sk->sk_allocation &= ~__GFP_MEMALLOC;
302 static_key_slow_dec(&memalloc_socks);
305 * SOCK_MEMALLOC is allowed to ignore rmem limits to ensure forward
306 * progress of swapping. However, if SOCK_MEMALLOC is cleared while
307 * it has rmem allocations there is a risk that the user of the
308 * socket cannot make forward progress due to exceeding the rmem
309 * limits. By rights, sk_clear_memalloc() should only be called
310 * on sockets being torn down but warn and reset the accounting if
311 * that assumption breaks.
313 if (WARN_ON(sk->sk_forward_alloc))
316 EXPORT_SYMBOL_GPL(sk_clear_memalloc);
318 int __sk_backlog_rcv(struct sock *sk, struct sk_buff *skb)
321 unsigned long pflags = current->flags;
323 /* these should have been dropped before queueing */
324 BUG_ON(!sock_flag(sk, SOCK_MEMALLOC));
326 current->flags |= PF_MEMALLOC;
327 ret = sk->sk_backlog_rcv(sk, skb);
328 tsk_restore_flags(current, pflags, PF_MEMALLOC);
332 EXPORT_SYMBOL(__sk_backlog_rcv);
334 static int sock_set_timeout(long *timeo_p, char __user *optval, int optlen)
338 if (optlen < sizeof(tv))
340 if (copy_from_user(&tv, optval, sizeof(tv)))
342 if (tv.tv_usec < 0 || tv.tv_usec >= USEC_PER_SEC)
346 static int warned __read_mostly;
349 if (warned < 10 && net_ratelimit()) {
351 pr_info("%s: `%s' (pid %d) tries to set negative timeout\n",
352 __func__, current->comm, task_pid_nr(current));
356 *timeo_p = MAX_SCHEDULE_TIMEOUT;
357 if (tv.tv_sec == 0 && tv.tv_usec == 0)
359 if (tv.tv_sec < (MAX_SCHEDULE_TIMEOUT/HZ - 1))
360 *timeo_p = tv.tv_sec*HZ + (tv.tv_usec+(1000000/HZ-1))/(1000000/HZ);
364 static void sock_warn_obsolete_bsdism(const char *name)
367 static char warncomm[TASK_COMM_LEN];
368 if (strcmp(warncomm, current->comm) && warned < 5) {
369 strcpy(warncomm, current->comm);
370 pr_warn("process `%s' is using obsolete %s SO_BSDCOMPAT\n",
376 #define SK_FLAGS_TIMESTAMP ((1UL << SOCK_TIMESTAMP) | (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE))
378 static void sock_disable_timestamp(struct sock *sk, unsigned long flags)
380 if (sk->sk_flags & flags) {
381 sk->sk_flags &= ~flags;
382 if (!(sk->sk_flags & SK_FLAGS_TIMESTAMP))
383 net_disable_timestamp();
388 int sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
393 struct sk_buff_head *list = &sk->sk_receive_queue;
395 if (atomic_read(&sk->sk_rmem_alloc) >= sk->sk_rcvbuf) {
396 atomic_inc(&sk->sk_drops);
397 trace_sock_rcvqueue_full(sk, skb);
401 err = sk_filter(sk, skb);
405 if (!sk_rmem_schedule(sk, skb, skb->truesize)) {
406 atomic_inc(&sk->sk_drops);
411 skb_set_owner_r(skb, sk);
413 /* Cache the SKB length before we tack it onto the receive
414 * queue. Once it is added it no longer belongs to us and
415 * may be freed by other threads of control pulling packets
420 /* we escape from rcu protected region, make sure we dont leak
425 spin_lock_irqsave(&list->lock, flags);
426 skb->dropcount = atomic_read(&sk->sk_drops);
427 __skb_queue_tail(list, skb);
428 spin_unlock_irqrestore(&list->lock, flags);
430 if (!sock_flag(sk, SOCK_DEAD))
431 sk->sk_data_ready(sk, skb_len);
434 EXPORT_SYMBOL(sock_queue_rcv_skb);
436 int sk_receive_skb(struct sock *sk, struct sk_buff *skb, const int nested)
438 int rc = NET_RX_SUCCESS;
440 if (sk_filter(sk, skb))
441 goto discard_and_relse;
445 if (sk_rcvqueues_full(sk, skb, sk->sk_rcvbuf)) {
446 atomic_inc(&sk->sk_drops);
447 goto discard_and_relse;
450 bh_lock_sock_nested(sk);
453 if (!sock_owned_by_user(sk)) {
455 * trylock + unlock semantics:
457 mutex_acquire(&sk->sk_lock.dep_map, 0, 1, _RET_IP_);
459 rc = sk_backlog_rcv(sk, skb);
461 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_);
462 } else if (sk_add_backlog(sk, skb, sk->sk_rcvbuf)) {
464 atomic_inc(&sk->sk_drops);
465 goto discard_and_relse;
476 EXPORT_SYMBOL(sk_receive_skb);
478 struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie)
480 struct dst_entry *dst = __sk_dst_get(sk);
482 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
483 sk_tx_queue_clear(sk);
484 RCU_INIT_POINTER(sk->sk_dst_cache, NULL);
491 EXPORT_SYMBOL(__sk_dst_check);
493 struct dst_entry *sk_dst_check(struct sock *sk, u32 cookie)
495 struct dst_entry *dst = sk_dst_get(sk);
497 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
505 EXPORT_SYMBOL(sk_dst_check);
507 static int sock_setbindtodevice(struct sock *sk, char __user *optval,
510 int ret = -ENOPROTOOPT;
511 #ifdef CONFIG_NETDEVICES
512 struct net *net = sock_net(sk);
513 char devname[IFNAMSIZ];
518 if (!ns_capable(net->user_ns, CAP_NET_RAW))
525 /* Bind this socket to a particular device like "eth0",
526 * as specified in the passed interface name. If the
527 * name is "" or the option length is zero the socket
530 if (optlen > IFNAMSIZ - 1)
531 optlen = IFNAMSIZ - 1;
532 memset(devname, 0, sizeof(devname));
535 if (copy_from_user(devname, optval, optlen))
539 if (devname[0] != '\0') {
540 struct net_device *dev;
543 dev = dev_get_by_name_rcu(net, devname);
545 index = dev->ifindex;
553 sk->sk_bound_dev_if = index;
565 static int sock_getbindtodevice(struct sock *sk, char __user *optval,
566 int __user *optlen, int len)
568 int ret = -ENOPROTOOPT;
569 #ifdef CONFIG_NETDEVICES
570 struct net *net = sock_net(sk);
571 char devname[IFNAMSIZ];
573 if (sk->sk_bound_dev_if == 0) {
582 ret = netdev_get_name(net, devname, sk->sk_bound_dev_if);
586 len = strlen(devname) + 1;
589 if (copy_to_user(optval, devname, len))
594 if (put_user(len, optlen))
605 static inline void sock_valbool_flag(struct sock *sk, int bit, int valbool)
608 sock_set_flag(sk, bit);
610 sock_reset_flag(sk, bit);
614 * This is meant for all protocols to use and covers goings on
615 * at the socket level. Everything here is generic.
618 int sock_setsockopt(struct socket *sock, int level, int optname,
619 char __user *optval, unsigned int optlen)
621 struct sock *sk = sock->sk;
628 * Options without arguments
631 if (optname == SO_BINDTODEVICE)
632 return sock_setbindtodevice(sk, optval, optlen);
634 if (optlen < sizeof(int))
637 if (get_user(val, (int __user *)optval))
640 valbool = val ? 1 : 0;
646 if (val && !capable(CAP_NET_ADMIN))
649 sock_valbool_flag(sk, SOCK_DBG, valbool);
652 sk->sk_reuse = (valbool ? SK_CAN_REUSE : SK_NO_REUSE);
655 sk->sk_reuseport = valbool;
664 sock_valbool_flag(sk, SOCK_LOCALROUTE, valbool);
667 sock_valbool_flag(sk, SOCK_BROADCAST, valbool);
670 /* Don't error on this BSD doesn't and if you think
671 * about it this is right. Otherwise apps have to
672 * play 'guess the biggest size' games. RCVBUF/SNDBUF
673 * are treated in BSD as hints
675 val = min_t(u32, val, sysctl_wmem_max);
677 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
678 sk->sk_sndbuf = max_t(u32, val * 2, SOCK_MIN_SNDBUF);
679 /* Wake up sending tasks if we upped the value. */
680 sk->sk_write_space(sk);
684 if (!capable(CAP_NET_ADMIN)) {
691 /* Don't error on this BSD doesn't and if you think
692 * about it this is right. Otherwise apps have to
693 * play 'guess the biggest size' games. RCVBUF/SNDBUF
694 * are treated in BSD as hints
696 val = min_t(u32, val, sysctl_rmem_max);
698 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
700 * We double it on the way in to account for
701 * "struct sk_buff" etc. overhead. Applications
702 * assume that the SO_RCVBUF setting they make will
703 * allow that much actual data to be received on that
706 * Applications are unaware that "struct sk_buff" and
707 * other overheads allocate from the receive buffer
708 * during socket buffer allocation.
710 * And after considering the possible alternatives,
711 * returning the value we actually used in getsockopt
712 * is the most desirable behavior.
714 sk->sk_rcvbuf = max_t(u32, val * 2, SOCK_MIN_RCVBUF);
718 if (!capable(CAP_NET_ADMIN)) {
726 if (sk->sk_protocol == IPPROTO_TCP &&
727 sk->sk_type == SOCK_STREAM)
728 tcp_set_keepalive(sk, valbool);
730 sock_valbool_flag(sk, SOCK_KEEPOPEN, valbool);
734 sock_valbool_flag(sk, SOCK_URGINLINE, valbool);
738 sk->sk_no_check = valbool;
742 if ((val >= 0 && val <= 6) ||
743 ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
744 sk->sk_priority = val;
750 if (optlen < sizeof(ling)) {
751 ret = -EINVAL; /* 1003.1g */
754 if (copy_from_user(&ling, optval, sizeof(ling))) {
759 sock_reset_flag(sk, SOCK_LINGER);
761 #if (BITS_PER_LONG == 32)
762 if ((unsigned int)ling.l_linger >= MAX_SCHEDULE_TIMEOUT/HZ)
763 sk->sk_lingertime = MAX_SCHEDULE_TIMEOUT;
766 sk->sk_lingertime = (unsigned int)ling.l_linger * HZ;
767 sock_set_flag(sk, SOCK_LINGER);
772 sock_warn_obsolete_bsdism("setsockopt");
777 set_bit(SOCK_PASSCRED, &sock->flags);
779 clear_bit(SOCK_PASSCRED, &sock->flags);
785 if (optname == SO_TIMESTAMP)
786 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
788 sock_set_flag(sk, SOCK_RCVTSTAMPNS);
789 sock_set_flag(sk, SOCK_RCVTSTAMP);
790 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
792 sock_reset_flag(sk, SOCK_RCVTSTAMP);
793 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
797 case SO_TIMESTAMPING:
798 if (val & ~SOF_TIMESTAMPING_MASK) {
802 sock_valbool_flag(sk, SOCK_TIMESTAMPING_TX_HARDWARE,
803 val & SOF_TIMESTAMPING_TX_HARDWARE);
804 sock_valbool_flag(sk, SOCK_TIMESTAMPING_TX_SOFTWARE,
805 val & SOF_TIMESTAMPING_TX_SOFTWARE);
806 sock_valbool_flag(sk, SOCK_TIMESTAMPING_RX_HARDWARE,
807 val & SOF_TIMESTAMPING_RX_HARDWARE);
808 if (val & SOF_TIMESTAMPING_RX_SOFTWARE)
809 sock_enable_timestamp(sk,
810 SOCK_TIMESTAMPING_RX_SOFTWARE);
812 sock_disable_timestamp(sk,
813 (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE));
814 sock_valbool_flag(sk, SOCK_TIMESTAMPING_SOFTWARE,
815 val & SOF_TIMESTAMPING_SOFTWARE);
816 sock_valbool_flag(sk, SOCK_TIMESTAMPING_SYS_HARDWARE,
817 val & SOF_TIMESTAMPING_SYS_HARDWARE);
818 sock_valbool_flag(sk, SOCK_TIMESTAMPING_RAW_HARDWARE,
819 val & SOF_TIMESTAMPING_RAW_HARDWARE);
825 sk->sk_rcvlowat = val ? : 1;
829 ret = sock_set_timeout(&sk->sk_rcvtimeo, optval, optlen);
833 ret = sock_set_timeout(&sk->sk_sndtimeo, optval, optlen);
836 case SO_ATTACH_FILTER:
838 if (optlen == sizeof(struct sock_fprog)) {
839 struct sock_fprog fprog;
842 if (copy_from_user(&fprog, optval, sizeof(fprog)))
845 ret = sk_attach_filter(&fprog, sk);
849 case SO_DETACH_FILTER:
850 ret = sk_detach_filter(sk);
854 if (sock_flag(sk, SOCK_FILTER_LOCKED) && !valbool)
857 sock_valbool_flag(sk, SOCK_FILTER_LOCKED, valbool);
862 set_bit(SOCK_PASSSEC, &sock->flags);
864 clear_bit(SOCK_PASSSEC, &sock->flags);
867 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
873 /* We implement the SO_SNDLOWAT etc to
874 not be settable (1003.1g 5.3) */
876 sock_valbool_flag(sk, SOCK_RXQ_OVFL, valbool);
880 sock_valbool_flag(sk, SOCK_WIFI_STATUS, valbool);
884 if (sock->ops->set_peek_off)
885 sock->ops->set_peek_off(sk, val);
891 sock_valbool_flag(sk, SOCK_NOFCS, valbool);
894 case SO_SELECT_ERR_QUEUE:
895 sock_valbool_flag(sk, SOCK_SELECT_ERR_QUEUE, valbool);
898 #ifdef CONFIG_NET_RX_BUSY_POLL
900 /* allow unprivileged users to decrease the value */
901 if ((val > sk->sk_ll_usec) && !capable(CAP_NET_ADMIN))
907 sk->sk_ll_usec = val;
912 case SO_MAX_PACING_RATE:
913 sk->sk_max_pacing_rate = val;
914 sk->sk_pacing_rate = min(sk->sk_pacing_rate,
915 sk->sk_max_pacing_rate);
925 EXPORT_SYMBOL(sock_setsockopt);
928 void cred_to_ucred(struct pid *pid, const struct cred *cred,
931 ucred->pid = pid_vnr(pid);
932 ucred->uid = ucred->gid = -1;
934 struct user_namespace *current_ns = current_user_ns();
936 ucred->uid = from_kuid_munged(current_ns, cred->euid);
937 ucred->gid = from_kgid_munged(current_ns, cred->egid);
940 EXPORT_SYMBOL_GPL(cred_to_ucred);
942 int sock_getsockopt(struct socket *sock, int level, int optname,
943 char __user *optval, int __user *optlen)
945 struct sock *sk = sock->sk;
953 int lv = sizeof(int);
956 if (get_user(len, optlen))
961 memset(&v, 0, sizeof(v));
965 v.val = sock_flag(sk, SOCK_DBG);
969 v.val = sock_flag(sk, SOCK_LOCALROUTE);
973 v.val = sock_flag(sk, SOCK_BROADCAST);
977 v.val = sk->sk_sndbuf;
981 v.val = sk->sk_rcvbuf;
985 v.val = sk->sk_reuse;
989 v.val = sk->sk_reuseport;
993 v.val = sock_flag(sk, SOCK_KEEPOPEN);
1001 v.val = sk->sk_protocol;
1005 v.val = sk->sk_family;
1009 v.val = -sock_error(sk);
1011 v.val = xchg(&sk->sk_err_soft, 0);
1015 v.val = sock_flag(sk, SOCK_URGINLINE);
1019 v.val = sk->sk_no_check;
1023 v.val = sk->sk_priority;
1027 lv = sizeof(v.ling);
1028 v.ling.l_onoff = sock_flag(sk, SOCK_LINGER);
1029 v.ling.l_linger = sk->sk_lingertime / HZ;
1033 sock_warn_obsolete_bsdism("getsockopt");
1037 v.val = sock_flag(sk, SOCK_RCVTSTAMP) &&
1038 !sock_flag(sk, SOCK_RCVTSTAMPNS);
1041 case SO_TIMESTAMPNS:
1042 v.val = sock_flag(sk, SOCK_RCVTSTAMPNS);
1045 case SO_TIMESTAMPING:
1047 if (sock_flag(sk, SOCK_TIMESTAMPING_TX_HARDWARE))
1048 v.val |= SOF_TIMESTAMPING_TX_HARDWARE;
1049 if (sock_flag(sk, SOCK_TIMESTAMPING_TX_SOFTWARE))
1050 v.val |= SOF_TIMESTAMPING_TX_SOFTWARE;
1051 if (sock_flag(sk, SOCK_TIMESTAMPING_RX_HARDWARE))
1052 v.val |= SOF_TIMESTAMPING_RX_HARDWARE;
1053 if (sock_flag(sk, SOCK_TIMESTAMPING_RX_SOFTWARE))
1054 v.val |= SOF_TIMESTAMPING_RX_SOFTWARE;
1055 if (sock_flag(sk, SOCK_TIMESTAMPING_SOFTWARE))
1056 v.val |= SOF_TIMESTAMPING_SOFTWARE;
1057 if (sock_flag(sk, SOCK_TIMESTAMPING_SYS_HARDWARE))
1058 v.val |= SOF_TIMESTAMPING_SYS_HARDWARE;
1059 if (sock_flag(sk, SOCK_TIMESTAMPING_RAW_HARDWARE))
1060 v.val |= SOF_TIMESTAMPING_RAW_HARDWARE;
1064 lv = sizeof(struct timeval);
1065 if (sk->sk_rcvtimeo == MAX_SCHEDULE_TIMEOUT) {
1069 v.tm.tv_sec = sk->sk_rcvtimeo / HZ;
1070 v.tm.tv_usec = ((sk->sk_rcvtimeo % HZ) * 1000000) / HZ;
1075 lv = sizeof(struct timeval);
1076 if (sk->sk_sndtimeo == MAX_SCHEDULE_TIMEOUT) {
1080 v.tm.tv_sec = sk->sk_sndtimeo / HZ;
1081 v.tm.tv_usec = ((sk->sk_sndtimeo % HZ) * 1000000) / HZ;
1086 v.val = sk->sk_rcvlowat;
1094 v.val = !!test_bit(SOCK_PASSCRED, &sock->flags);
1099 struct ucred peercred;
1100 if (len > sizeof(peercred))
1101 len = sizeof(peercred);
1102 cred_to_ucred(sk->sk_peer_pid, sk->sk_peer_cred, &peercred);
1103 if (copy_to_user(optval, &peercred, len))
1112 if (sock->ops->getname(sock, (struct sockaddr *)address, &lv, 2))
1116 if (copy_to_user(optval, address, len))
1121 /* Dubious BSD thing... Probably nobody even uses it, but
1122 * the UNIX standard wants it for whatever reason... -DaveM
1125 v.val = sk->sk_state == TCP_LISTEN;
1129 v.val = !!test_bit(SOCK_PASSSEC, &sock->flags);
1133 return security_socket_getpeersec_stream(sock, optval, optlen, len);
1136 v.val = sk->sk_mark;
1140 v.val = sock_flag(sk, SOCK_RXQ_OVFL);
1143 case SO_WIFI_STATUS:
1144 v.val = sock_flag(sk, SOCK_WIFI_STATUS);
1148 if (!sock->ops->set_peek_off)
1151 v.val = sk->sk_peek_off;
1154 v.val = sock_flag(sk, SOCK_NOFCS);
1157 case SO_BINDTODEVICE:
1158 return sock_getbindtodevice(sk, optval, optlen, len);
1161 len = sk_get_filter(sk, (struct sock_filter __user *)optval, len);
1167 case SO_LOCK_FILTER:
1168 v.val = sock_flag(sk, SOCK_FILTER_LOCKED);
1171 case SO_SELECT_ERR_QUEUE:
1172 v.val = sock_flag(sk, SOCK_SELECT_ERR_QUEUE);
1175 #ifdef CONFIG_NET_RX_BUSY_POLL
1177 v.val = sk->sk_ll_usec;
1181 case SO_MAX_PACING_RATE:
1182 v.val = sk->sk_max_pacing_rate;
1186 return -ENOPROTOOPT;
1191 if (copy_to_user(optval, &v, len))
1194 if (put_user(len, optlen))
1200 * Initialize an sk_lock.
1202 * (We also register the sk_lock with the lock validator.)
1204 static inline void sock_lock_init(struct sock *sk)
1206 sock_lock_init_class_and_name(sk,
1207 af_family_slock_key_strings[sk->sk_family],
1208 af_family_slock_keys + sk->sk_family,
1209 af_family_key_strings[sk->sk_family],
1210 af_family_keys + sk->sk_family);
1214 * Copy all fields from osk to nsk but nsk->sk_refcnt must not change yet,
1215 * even temporarly, because of RCU lookups. sk_node should also be left as is.
1216 * We must not copy fields between sk_dontcopy_begin and sk_dontcopy_end
1218 static void sock_copy(struct sock *nsk, const struct sock *osk)
1220 #ifdef CONFIG_SECURITY_NETWORK
1221 void *sptr = nsk->sk_security;
1223 memcpy(nsk, osk, offsetof(struct sock, sk_dontcopy_begin));
1225 memcpy(&nsk->sk_dontcopy_end, &osk->sk_dontcopy_end,
1226 osk->sk_prot->obj_size - offsetof(struct sock, sk_dontcopy_end));
1228 #ifdef CONFIG_SECURITY_NETWORK
1229 nsk->sk_security = sptr;
1230 security_sk_clone(osk, nsk);
1234 void sk_prot_clear_portaddr_nulls(struct sock *sk, int size)
1236 unsigned long nulls1, nulls2;
1238 nulls1 = offsetof(struct sock, __sk_common.skc_node.next);
1239 nulls2 = offsetof(struct sock, __sk_common.skc_portaddr_node.next);
1240 if (nulls1 > nulls2)
1241 swap(nulls1, nulls2);
1244 memset((char *)sk, 0, nulls1);
1245 memset((char *)sk + nulls1 + sizeof(void *), 0,
1246 nulls2 - nulls1 - sizeof(void *));
1247 memset((char *)sk + nulls2 + sizeof(void *), 0,
1248 size - nulls2 - sizeof(void *));
1250 EXPORT_SYMBOL(sk_prot_clear_portaddr_nulls);
1252 static struct sock *sk_prot_alloc(struct proto *prot, gfp_t priority,
1256 struct kmem_cache *slab;
1260 sk = kmem_cache_alloc(slab, priority & ~__GFP_ZERO);
1263 if (priority & __GFP_ZERO) {
1265 prot->clear_sk(sk, prot->obj_size);
1267 sk_prot_clear_nulls(sk, prot->obj_size);
1270 sk = kmalloc(prot->obj_size, priority);
1273 kmemcheck_annotate_bitfield(sk, flags);
1275 if (security_sk_alloc(sk, family, priority))
1278 if (!try_module_get(prot->owner))
1280 sk_tx_queue_clear(sk);
1286 security_sk_free(sk);
1289 kmem_cache_free(slab, sk);
1295 static void sk_prot_free(struct proto *prot, struct sock *sk)
1297 struct kmem_cache *slab;
1298 struct module *owner;
1300 owner = prot->owner;
1303 security_sk_free(sk);
1305 kmem_cache_free(slab, sk);
1311 #if IS_ENABLED(CONFIG_CGROUP_NET_PRIO)
1312 void sock_update_netprioidx(struct sock *sk)
1317 sk->sk_cgrp_prioidx = task_netprioidx(current);
1319 EXPORT_SYMBOL_GPL(sock_update_netprioidx);
1323 * sk_alloc - All socket objects are allocated here
1324 * @net: the applicable net namespace
1325 * @family: protocol family
1326 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
1327 * @prot: struct proto associated with this new sock instance
1329 struct sock *sk_alloc(struct net *net, int family, gfp_t priority,
1334 sk = sk_prot_alloc(prot, priority | __GFP_ZERO, family);
1336 sk->sk_family = family;
1338 * See comment in struct sock definition to understand
1339 * why we need sk_prot_creator -acme
1341 sk->sk_prot = sk->sk_prot_creator = prot;
1343 sock_net_set(sk, get_net(net));
1344 atomic_set(&sk->sk_wmem_alloc, 1);
1346 sock_update_classid(sk);
1347 sock_update_netprioidx(sk);
1352 EXPORT_SYMBOL(sk_alloc);
1354 static void __sk_free(struct sock *sk)
1356 struct sk_filter *filter;
1358 if (sk->sk_destruct)
1359 sk->sk_destruct(sk);
1361 filter = rcu_dereference_check(sk->sk_filter,
1362 atomic_read(&sk->sk_wmem_alloc) == 0);
1364 sk_filter_uncharge(sk, filter);
1365 RCU_INIT_POINTER(sk->sk_filter, NULL);
1368 sock_disable_timestamp(sk, SK_FLAGS_TIMESTAMP);
1370 if (atomic_read(&sk->sk_omem_alloc))
1371 pr_debug("%s: optmem leakage (%d bytes) detected\n",
1372 __func__, atomic_read(&sk->sk_omem_alloc));
1374 if (sk->sk_peer_cred)
1375 put_cred(sk->sk_peer_cred);
1376 put_pid(sk->sk_peer_pid);
1377 put_net(sock_net(sk));
1378 sk_prot_free(sk->sk_prot_creator, sk);
1381 void sk_free(struct sock *sk)
1384 * We subtract one from sk_wmem_alloc and can know if
1385 * some packets are still in some tx queue.
1386 * If not null, sock_wfree() will call __sk_free(sk) later
1388 if (atomic_dec_and_test(&sk->sk_wmem_alloc))
1391 EXPORT_SYMBOL(sk_free);
1394 * Last sock_put should drop reference to sk->sk_net. It has already
1395 * been dropped in sk_change_net. Taking reference to stopping namespace
1397 * Take reference to a socket to remove it from hash _alive_ and after that
1398 * destroy it in the context of init_net.
1400 void sk_release_kernel(struct sock *sk)
1402 if (sk == NULL || sk->sk_socket == NULL)
1406 sock_release(sk->sk_socket);
1407 release_net(sock_net(sk));
1408 sock_net_set(sk, get_net(&init_net));
1411 EXPORT_SYMBOL(sk_release_kernel);
1413 static void sk_update_clone(const struct sock *sk, struct sock *newsk)
1415 if (mem_cgroup_sockets_enabled && sk->sk_cgrp)
1416 sock_update_memcg(newsk);
1420 * sk_clone_lock - clone a socket, and lock its clone
1421 * @sk: the socket to clone
1422 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
1424 * Caller must unlock socket even in error path (bh_unlock_sock(newsk))
1426 struct sock *sk_clone_lock(const struct sock *sk, const gfp_t priority)
1430 newsk = sk_prot_alloc(sk->sk_prot, priority, sk->sk_family);
1431 if (newsk != NULL) {
1432 struct sk_filter *filter;
1434 sock_copy(newsk, sk);
1437 get_net(sock_net(newsk));
1438 sk_node_init(&newsk->sk_node);
1439 sock_lock_init(newsk);
1440 bh_lock_sock(newsk);
1441 newsk->sk_backlog.head = newsk->sk_backlog.tail = NULL;
1442 newsk->sk_backlog.len = 0;
1444 atomic_set(&newsk->sk_rmem_alloc, 0);
1446 * sk_wmem_alloc set to one (see sk_free() and sock_wfree())
1448 atomic_set(&newsk->sk_wmem_alloc, 1);
1449 atomic_set(&newsk->sk_omem_alloc, 0);
1450 skb_queue_head_init(&newsk->sk_receive_queue);
1451 skb_queue_head_init(&newsk->sk_write_queue);
1452 #ifdef CONFIG_NET_DMA
1453 skb_queue_head_init(&newsk->sk_async_wait_queue);
1456 spin_lock_init(&newsk->sk_dst_lock);
1457 rwlock_init(&newsk->sk_callback_lock);
1458 lockdep_set_class_and_name(&newsk->sk_callback_lock,
1459 af_callback_keys + newsk->sk_family,
1460 af_family_clock_key_strings[newsk->sk_family]);
1462 newsk->sk_dst_cache = NULL;
1463 newsk->sk_wmem_queued = 0;
1464 newsk->sk_forward_alloc = 0;
1465 newsk->sk_send_head = NULL;
1466 newsk->sk_userlocks = sk->sk_userlocks & ~SOCK_BINDPORT_LOCK;
1468 sock_reset_flag(newsk, SOCK_DONE);
1469 skb_queue_head_init(&newsk->sk_error_queue);
1471 filter = rcu_dereference_protected(newsk->sk_filter, 1);
1473 sk_filter_charge(newsk, filter);
1475 if (unlikely(xfrm_sk_clone_policy(newsk))) {
1476 /* It is still raw copy of parent, so invalidate
1477 * destructor and make plain sk_free() */
1478 newsk->sk_destruct = NULL;
1479 bh_unlock_sock(newsk);
1486 newsk->sk_priority = 0;
1488 * Before updating sk_refcnt, we must commit prior changes to memory
1489 * (Documentation/RCU/rculist_nulls.txt for details)
1492 atomic_set(&newsk->sk_refcnt, 2);
1495 * Increment the counter in the same struct proto as the master
1496 * sock (sk_refcnt_debug_inc uses newsk->sk_prot->socks, that
1497 * is the same as sk->sk_prot->socks, as this field was copied
1500 * This _changes_ the previous behaviour, where
1501 * tcp_create_openreq_child always was incrementing the
1502 * equivalent to tcp_prot->socks (inet_sock_nr), so this have
1503 * to be taken into account in all callers. -acme
1505 sk_refcnt_debug_inc(newsk);
1506 sk_set_socket(newsk, NULL);
1507 newsk->sk_wq = NULL;
1509 sk_update_clone(sk, newsk);
1511 if (newsk->sk_prot->sockets_allocated)
1512 sk_sockets_allocated_inc(newsk);
1514 if (newsk->sk_flags & SK_FLAGS_TIMESTAMP)
1515 net_enable_timestamp();
1520 EXPORT_SYMBOL_GPL(sk_clone_lock);
1522 void sk_setup_caps(struct sock *sk, struct dst_entry *dst)
1524 __sk_dst_set(sk, dst);
1525 sk->sk_route_caps = dst->dev->features;
1526 if (sk->sk_route_caps & NETIF_F_GSO)
1527 sk->sk_route_caps |= NETIF_F_GSO_SOFTWARE;
1528 sk->sk_route_caps &= ~sk->sk_route_nocaps;
1529 if (sk_can_gso(sk)) {
1530 if (dst->header_len) {
1531 sk->sk_route_caps &= ~NETIF_F_GSO_MASK;
1533 sk->sk_route_caps |= NETIF_F_SG | NETIF_F_HW_CSUM;
1534 sk->sk_gso_max_size = dst->dev->gso_max_size;
1535 sk->sk_gso_max_segs = dst->dev->gso_max_segs;
1539 EXPORT_SYMBOL_GPL(sk_setup_caps);
1542 * Simple resource managers for sockets.
1547 * Write buffer destructor automatically called from kfree_skb.
1549 void sock_wfree(struct sk_buff *skb)
1551 struct sock *sk = skb->sk;
1552 unsigned int len = skb->truesize;
1554 if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE)) {
1556 * Keep a reference on sk_wmem_alloc, this will be released
1557 * after sk_write_space() call
1559 atomic_sub(len - 1, &sk->sk_wmem_alloc);
1560 sk->sk_write_space(sk);
1564 * if sk_wmem_alloc reaches 0, we must finish what sk_free()
1565 * could not do because of in-flight packets
1567 if (atomic_sub_and_test(len, &sk->sk_wmem_alloc))
1570 EXPORT_SYMBOL(sock_wfree);
1572 void skb_orphan_partial(struct sk_buff *skb)
1574 /* TCP stack sets skb->ooo_okay based on sk_wmem_alloc,
1575 * so we do not completely orphan skb, but transfert all
1576 * accounted bytes but one, to avoid unexpected reorders.
1578 if (skb->destructor == sock_wfree
1580 || skb->destructor == tcp_wfree
1583 atomic_sub(skb->truesize - 1, &skb->sk->sk_wmem_alloc);
1589 EXPORT_SYMBOL(skb_orphan_partial);
1592 * Read buffer destructor automatically called from kfree_skb.
1594 void sock_rfree(struct sk_buff *skb)
1596 struct sock *sk = skb->sk;
1597 unsigned int len = skb->truesize;
1599 atomic_sub(len, &sk->sk_rmem_alloc);
1600 sk_mem_uncharge(sk, len);
1602 EXPORT_SYMBOL(sock_rfree);
1604 void sock_edemux(struct sk_buff *skb)
1606 struct sock *sk = skb->sk;
1609 if (sk->sk_state == TCP_TIME_WAIT)
1610 inet_twsk_put(inet_twsk(sk));
1615 EXPORT_SYMBOL(sock_edemux);
1617 kuid_t sock_i_uid(struct sock *sk)
1621 read_lock_bh(&sk->sk_callback_lock);
1622 uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : GLOBAL_ROOT_UID;
1623 read_unlock_bh(&sk->sk_callback_lock);
1626 EXPORT_SYMBOL(sock_i_uid);
1628 unsigned long sock_i_ino(struct sock *sk)
1632 read_lock_bh(&sk->sk_callback_lock);
1633 ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0;
1634 read_unlock_bh(&sk->sk_callback_lock);
1637 EXPORT_SYMBOL(sock_i_ino);
1640 * Allocate a skb from the socket's send buffer.
1642 struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force,
1645 if (force || atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
1646 struct sk_buff *skb = alloc_skb(size, priority);
1648 skb_set_owner_w(skb, sk);
1654 EXPORT_SYMBOL(sock_wmalloc);
1657 * Allocate a skb from the socket's receive buffer.
1659 struct sk_buff *sock_rmalloc(struct sock *sk, unsigned long size, int force,
1662 if (force || atomic_read(&sk->sk_rmem_alloc) < sk->sk_rcvbuf) {
1663 struct sk_buff *skb = alloc_skb(size, priority);
1665 skb_set_owner_r(skb, sk);
1673 * Allocate a memory block from the socket's option memory buffer.
1675 void *sock_kmalloc(struct sock *sk, int size, gfp_t priority)
1677 if ((unsigned int)size <= sysctl_optmem_max &&
1678 atomic_read(&sk->sk_omem_alloc) + size < sysctl_optmem_max) {
1680 /* First do the add, to avoid the race if kmalloc
1683 atomic_add(size, &sk->sk_omem_alloc);
1684 mem = kmalloc(size, priority);
1687 atomic_sub(size, &sk->sk_omem_alloc);
1691 EXPORT_SYMBOL(sock_kmalloc);
1694 * Free an option memory block.
1696 void sock_kfree_s(struct sock *sk, void *mem, int size)
1699 atomic_sub(size, &sk->sk_omem_alloc);
1701 EXPORT_SYMBOL(sock_kfree_s);
1703 /* It is almost wait_for_tcp_memory minus release_sock/lock_sock.
1704 I think, these locks should be removed for datagram sockets.
1706 static long sock_wait_for_wmem(struct sock *sk, long timeo)
1710 clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1714 if (signal_pending(current))
1716 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1717 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1718 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf)
1720 if (sk->sk_shutdown & SEND_SHUTDOWN)
1724 timeo = schedule_timeout(timeo);
1726 finish_wait(sk_sleep(sk), &wait);
1732 * Generic send/receive buffer handlers
1735 struct sk_buff *sock_alloc_send_pskb(struct sock *sk, unsigned long header_len,
1736 unsigned long data_len, int noblock,
1737 int *errcode, int max_page_order)
1739 struct sk_buff *skb = NULL;
1740 unsigned long chunk;
1744 int npages = (data_len + (PAGE_SIZE - 1)) >> PAGE_SHIFT;
1749 if (npages > MAX_SKB_FRAGS)
1752 timeo = sock_sndtimeo(sk, noblock);
1754 err = sock_error(sk);
1759 if (sk->sk_shutdown & SEND_SHUTDOWN)
1762 if (atomic_read(&sk->sk_wmem_alloc) >= sk->sk_sndbuf) {
1763 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1764 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1768 if (signal_pending(current))
1770 timeo = sock_wait_for_wmem(sk, timeo);
1775 gfp_mask = sk->sk_allocation;
1776 if (gfp_mask & __GFP_WAIT)
1777 gfp_mask |= __GFP_REPEAT;
1779 skb = alloc_skb(header_len, gfp_mask);
1783 skb->truesize += data_len;
1785 for (i = 0; npages > 0; i++) {
1786 int order = max_page_order;
1789 if (npages >= 1 << order) {
1790 page = alloc_pages(sk->sk_allocation |
1791 __GFP_COMP | __GFP_NOWARN,
1798 page = alloc_page(sk->sk_allocation);
1802 chunk = min_t(unsigned long, data_len,
1803 PAGE_SIZE << order);
1804 skb_fill_page_desc(skb, i, page, 0, chunk);
1806 npages -= 1 << order;
1810 skb_set_owner_w(skb, sk);
1814 err = sock_intr_errno(timeo);
1820 EXPORT_SYMBOL(sock_alloc_send_pskb);
1822 struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size,
1823 int noblock, int *errcode)
1825 return sock_alloc_send_pskb(sk, size, 0, noblock, errcode, 0);
1827 EXPORT_SYMBOL(sock_alloc_send_skb);
1829 /* On 32bit arches, an skb frag is limited to 2^15 */
1830 #define SKB_FRAG_PAGE_ORDER get_order(32768)
1833 * skb_page_frag_refill - check that a page_frag contains enough room
1834 * @sz: minimum size of the fragment we want to get
1835 * @pfrag: pointer to page_frag
1836 * @prio: priority for memory allocation
1838 * Note: While this allocator tries to use high order pages, there is
1839 * no guarantee that allocations succeed. Therefore, @sz MUST be
1840 * less or equal than PAGE_SIZE.
1842 bool skb_page_frag_refill(unsigned int sz, struct page_frag *pfrag, gfp_t prio)
1847 if (atomic_read(&pfrag->page->_count) == 1) {
1851 if (pfrag->offset + sz <= pfrag->size)
1853 put_page(pfrag->page);
1856 /* We restrict high order allocations to users that can afford to wait */
1857 order = (prio & __GFP_WAIT) ? SKB_FRAG_PAGE_ORDER : 0;
1863 gfp |= __GFP_COMP | __GFP_NOWARN;
1864 pfrag->page = alloc_pages(gfp, order);
1865 if (likely(pfrag->page)) {
1867 pfrag->size = PAGE_SIZE << order;
1870 } while (--order >= 0);
1874 EXPORT_SYMBOL(skb_page_frag_refill);
1876 bool sk_page_frag_refill(struct sock *sk, struct page_frag *pfrag)
1878 if (likely(skb_page_frag_refill(32U, pfrag, sk->sk_allocation)))
1881 sk_enter_memory_pressure(sk);
1882 sk_stream_moderate_sndbuf(sk);
1885 EXPORT_SYMBOL(sk_page_frag_refill);
1887 static void __lock_sock(struct sock *sk)
1888 __releases(&sk->sk_lock.slock)
1889 __acquires(&sk->sk_lock.slock)
1894 prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait,
1895 TASK_UNINTERRUPTIBLE);
1896 spin_unlock_bh(&sk->sk_lock.slock);
1898 spin_lock_bh(&sk->sk_lock.slock);
1899 if (!sock_owned_by_user(sk))
1902 finish_wait(&sk->sk_lock.wq, &wait);
1905 static void __release_sock(struct sock *sk)
1906 __releases(&sk->sk_lock.slock)
1907 __acquires(&sk->sk_lock.slock)
1909 struct sk_buff *skb = sk->sk_backlog.head;
1912 sk->sk_backlog.head = sk->sk_backlog.tail = NULL;
1916 struct sk_buff *next = skb->next;
1919 WARN_ON_ONCE(skb_dst_is_noref(skb));
1921 sk_backlog_rcv(sk, skb);
1924 * We are in process context here with softirqs
1925 * disabled, use cond_resched_softirq() to preempt.
1926 * This is safe to do because we've taken the backlog
1929 cond_resched_softirq();
1932 } while (skb != NULL);
1935 } while ((skb = sk->sk_backlog.head) != NULL);
1938 * Doing the zeroing here guarantee we can not loop forever
1939 * while a wild producer attempts to flood us.
1941 sk->sk_backlog.len = 0;
1945 * sk_wait_data - wait for data to arrive at sk_receive_queue
1946 * @sk: sock to wait on
1947 * @timeo: for how long
1949 * Now socket state including sk->sk_err is changed only under lock,
1950 * hence we may omit checks after joining wait queue.
1951 * We check receive queue before schedule() only as optimization;
1952 * it is very likely that release_sock() added new data.
1954 int sk_wait_data(struct sock *sk, long *timeo)
1959 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1960 set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
1961 rc = sk_wait_event(sk, timeo, !skb_queue_empty(&sk->sk_receive_queue));
1962 clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
1963 finish_wait(sk_sleep(sk), &wait);
1966 EXPORT_SYMBOL(sk_wait_data);
1969 * __sk_mem_schedule - increase sk_forward_alloc and memory_allocated
1971 * @size: memory size to allocate
1972 * @kind: allocation type
1974 * If kind is SK_MEM_SEND, it means wmem allocation. Otherwise it means
1975 * rmem allocation. This function assumes that protocols which have
1976 * memory_pressure use sk_wmem_queued as write buffer accounting.
1978 int __sk_mem_schedule(struct sock *sk, int size, int kind)
1980 struct proto *prot = sk->sk_prot;
1981 int amt = sk_mem_pages(size);
1983 int parent_status = UNDER_LIMIT;
1985 sk->sk_forward_alloc += amt * SK_MEM_QUANTUM;
1987 allocated = sk_memory_allocated_add(sk, amt, &parent_status);
1990 if (parent_status == UNDER_LIMIT &&
1991 allocated <= sk_prot_mem_limits(sk, 0)) {
1992 sk_leave_memory_pressure(sk);
1996 /* Under pressure. (we or our parents) */
1997 if ((parent_status > SOFT_LIMIT) ||
1998 allocated > sk_prot_mem_limits(sk, 1))
1999 sk_enter_memory_pressure(sk);
2001 /* Over hard limit (we or our parents) */
2002 if ((parent_status == OVER_LIMIT) ||
2003 (allocated > sk_prot_mem_limits(sk, 2)))
2004 goto suppress_allocation;
2006 /* guarantee minimum buffer size under pressure */
2007 if (kind == SK_MEM_RECV) {
2008 if (atomic_read(&sk->sk_rmem_alloc) < prot->sysctl_rmem[0])
2011 } else { /* SK_MEM_SEND */
2012 if (sk->sk_type == SOCK_STREAM) {
2013 if (sk->sk_wmem_queued < prot->sysctl_wmem[0])
2015 } else if (atomic_read(&sk->sk_wmem_alloc) <
2016 prot->sysctl_wmem[0])
2020 if (sk_has_memory_pressure(sk)) {
2023 if (!sk_under_memory_pressure(sk))
2025 alloc = sk_sockets_allocated_read_positive(sk);
2026 if (sk_prot_mem_limits(sk, 2) > alloc *
2027 sk_mem_pages(sk->sk_wmem_queued +
2028 atomic_read(&sk->sk_rmem_alloc) +
2029 sk->sk_forward_alloc))
2033 suppress_allocation:
2035 if (kind == SK_MEM_SEND && sk->sk_type == SOCK_STREAM) {
2036 sk_stream_moderate_sndbuf(sk);
2038 /* Fail only if socket is _under_ its sndbuf.
2039 * In this case we cannot block, so that we have to fail.
2041 if (sk->sk_wmem_queued + size >= sk->sk_sndbuf)
2045 trace_sock_exceed_buf_limit(sk, prot, allocated);
2047 /* Alas. Undo changes. */
2048 sk->sk_forward_alloc -= amt * SK_MEM_QUANTUM;
2050 sk_memory_allocated_sub(sk, amt);
2054 EXPORT_SYMBOL(__sk_mem_schedule);
2057 * __sk_reclaim - reclaim memory_allocated
2060 void __sk_mem_reclaim(struct sock *sk)
2062 sk_memory_allocated_sub(sk,
2063 sk->sk_forward_alloc >> SK_MEM_QUANTUM_SHIFT);
2064 sk->sk_forward_alloc &= SK_MEM_QUANTUM - 1;
2066 if (sk_under_memory_pressure(sk) &&
2067 (sk_memory_allocated(sk) < sk_prot_mem_limits(sk, 0)))
2068 sk_leave_memory_pressure(sk);
2070 EXPORT_SYMBOL(__sk_mem_reclaim);
2074 * Set of default routines for initialising struct proto_ops when
2075 * the protocol does not support a particular function. In certain
2076 * cases where it makes no sense for a protocol to have a "do nothing"
2077 * function, some default processing is provided.
2080 int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len)
2084 EXPORT_SYMBOL(sock_no_bind);
2086 int sock_no_connect(struct socket *sock, struct sockaddr *saddr,
2091 EXPORT_SYMBOL(sock_no_connect);
2093 int sock_no_socketpair(struct socket *sock1, struct socket *sock2)
2097 EXPORT_SYMBOL(sock_no_socketpair);
2099 int sock_no_accept(struct socket *sock, struct socket *newsock, int flags)
2103 EXPORT_SYMBOL(sock_no_accept);
2105 int sock_no_getname(struct socket *sock, struct sockaddr *saddr,
2110 EXPORT_SYMBOL(sock_no_getname);
2112 unsigned int sock_no_poll(struct file *file, struct socket *sock, poll_table *pt)
2116 EXPORT_SYMBOL(sock_no_poll);
2118 int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
2122 EXPORT_SYMBOL(sock_no_ioctl);
2124 int sock_no_listen(struct socket *sock, int backlog)
2128 EXPORT_SYMBOL(sock_no_listen);
2130 int sock_no_shutdown(struct socket *sock, int how)
2134 EXPORT_SYMBOL(sock_no_shutdown);
2136 int sock_no_setsockopt(struct socket *sock, int level, int optname,
2137 char __user *optval, unsigned int optlen)
2141 EXPORT_SYMBOL(sock_no_setsockopt);
2143 int sock_no_getsockopt(struct socket *sock, int level, int optname,
2144 char __user *optval, int __user *optlen)
2148 EXPORT_SYMBOL(sock_no_getsockopt);
2150 int sock_no_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
2155 EXPORT_SYMBOL(sock_no_sendmsg);
2157 int sock_no_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
2158 size_t len, int flags)
2162 EXPORT_SYMBOL(sock_no_recvmsg);
2164 int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma)
2166 /* Mirror missing mmap method error code */
2169 EXPORT_SYMBOL(sock_no_mmap);
2171 ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags)
2174 struct msghdr msg = {.msg_flags = flags};
2176 char *kaddr = kmap(page);
2177 iov.iov_base = kaddr + offset;
2179 res = kernel_sendmsg(sock, &msg, &iov, 1, size);
2183 EXPORT_SYMBOL(sock_no_sendpage);
2186 * Default Socket Callbacks
2189 static void sock_def_wakeup(struct sock *sk)
2191 struct socket_wq *wq;
2194 wq = rcu_dereference(sk->sk_wq);
2195 if (wq_has_sleeper(wq))
2196 wake_up_interruptible_all(&wq->wait);
2200 static void sock_def_error_report(struct sock *sk)
2202 struct socket_wq *wq;
2205 wq = rcu_dereference(sk->sk_wq);
2206 if (wq_has_sleeper(wq))
2207 wake_up_interruptible_poll(&wq->wait, POLLERR);
2208 sk_wake_async(sk, SOCK_WAKE_IO, POLL_ERR);
2212 static void sock_def_readable(struct sock *sk, int len)
2214 struct socket_wq *wq;
2217 wq = rcu_dereference(sk->sk_wq);
2218 if (wq_has_sleeper(wq))
2219 wake_up_interruptible_sync_poll(&wq->wait, POLLIN | POLLPRI |
2220 POLLRDNORM | POLLRDBAND);
2221 sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN);
2225 static void sock_def_write_space(struct sock *sk)
2227 struct socket_wq *wq;
2231 /* Do not wake up a writer until he can make "significant"
2234 if ((atomic_read(&sk->sk_wmem_alloc) << 1) <= sk->sk_sndbuf) {
2235 wq = rcu_dereference(sk->sk_wq);
2236 if (wq_has_sleeper(wq))
2237 wake_up_interruptible_sync_poll(&wq->wait, POLLOUT |
2238 POLLWRNORM | POLLWRBAND);
2240 /* Should agree with poll, otherwise some programs break */
2241 if (sock_writeable(sk))
2242 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
2248 static void sock_def_destruct(struct sock *sk)
2250 kfree(sk->sk_protinfo);
2253 void sk_send_sigurg(struct sock *sk)
2255 if (sk->sk_socket && sk->sk_socket->file)
2256 if (send_sigurg(&sk->sk_socket->file->f_owner))
2257 sk_wake_async(sk, SOCK_WAKE_URG, POLL_PRI);
2259 EXPORT_SYMBOL(sk_send_sigurg);
2261 void sk_reset_timer(struct sock *sk, struct timer_list* timer,
2262 unsigned long expires)
2264 if (!mod_timer(timer, expires))
2267 EXPORT_SYMBOL(sk_reset_timer);
2269 void sk_stop_timer(struct sock *sk, struct timer_list* timer)
2271 if (del_timer(timer))
2274 EXPORT_SYMBOL(sk_stop_timer);
2276 void sock_init_data(struct socket *sock, struct sock *sk)
2278 skb_queue_head_init(&sk->sk_receive_queue);
2279 skb_queue_head_init(&sk->sk_write_queue);
2280 skb_queue_head_init(&sk->sk_error_queue);
2281 #ifdef CONFIG_NET_DMA
2282 skb_queue_head_init(&sk->sk_async_wait_queue);
2285 sk->sk_send_head = NULL;
2287 init_timer(&sk->sk_timer);
2289 sk->sk_allocation = GFP_KERNEL;
2290 sk->sk_rcvbuf = sysctl_rmem_default;
2291 sk->sk_sndbuf = sysctl_wmem_default;
2292 sk->sk_state = TCP_CLOSE;
2293 sk_set_socket(sk, sock);
2295 sock_set_flag(sk, SOCK_ZAPPED);
2298 sk->sk_type = sock->type;
2299 sk->sk_wq = sock->wq;
2304 spin_lock_init(&sk->sk_dst_lock);
2305 rwlock_init(&sk->sk_callback_lock);
2306 lockdep_set_class_and_name(&sk->sk_callback_lock,
2307 af_callback_keys + sk->sk_family,
2308 af_family_clock_key_strings[sk->sk_family]);
2310 sk->sk_state_change = sock_def_wakeup;
2311 sk->sk_data_ready = sock_def_readable;
2312 sk->sk_write_space = sock_def_write_space;
2313 sk->sk_error_report = sock_def_error_report;
2314 sk->sk_destruct = sock_def_destruct;
2316 sk->sk_frag.page = NULL;
2317 sk->sk_frag.offset = 0;
2318 sk->sk_peek_off = -1;
2320 sk->sk_peer_pid = NULL;
2321 sk->sk_peer_cred = NULL;
2322 sk->sk_write_pending = 0;
2323 sk->sk_rcvlowat = 1;
2324 sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT;
2325 sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT;
2327 sk->sk_stamp = ktime_set(-1L, 0);
2329 #ifdef CONFIG_NET_RX_BUSY_POLL
2331 sk->sk_ll_usec = sysctl_net_busy_read;
2334 sk->sk_max_pacing_rate = ~0U;
2335 sk->sk_pacing_rate = ~0U;
2337 * Before updating sk_refcnt, we must commit prior changes to memory
2338 * (Documentation/RCU/rculist_nulls.txt for details)
2341 atomic_set(&sk->sk_refcnt, 1);
2342 atomic_set(&sk->sk_drops, 0);
2344 EXPORT_SYMBOL(sock_init_data);
2346 void lock_sock_nested(struct sock *sk, int subclass)
2349 spin_lock_bh(&sk->sk_lock.slock);
2350 if (sk->sk_lock.owned)
2352 sk->sk_lock.owned = 1;
2353 spin_unlock(&sk->sk_lock.slock);
2355 * The sk_lock has mutex_lock() semantics here:
2357 mutex_acquire(&sk->sk_lock.dep_map, subclass, 0, _RET_IP_);
2360 EXPORT_SYMBOL(lock_sock_nested);
2362 void release_sock(struct sock *sk)
2365 * The sk_lock has mutex_unlock() semantics:
2367 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_);
2369 spin_lock_bh(&sk->sk_lock.slock);
2370 if (sk->sk_backlog.tail)
2373 if (sk->sk_prot->release_cb)
2374 sk->sk_prot->release_cb(sk);
2376 sk->sk_lock.owned = 0;
2377 if (waitqueue_active(&sk->sk_lock.wq))
2378 wake_up(&sk->sk_lock.wq);
2379 spin_unlock_bh(&sk->sk_lock.slock);
2381 EXPORT_SYMBOL(release_sock);
2384 * lock_sock_fast - fast version of lock_sock
2387 * This version should be used for very small section, where process wont block
2388 * return false if fast path is taken
2389 * sk_lock.slock locked, owned = 0, BH disabled
2390 * return true if slow path is taken
2391 * sk_lock.slock unlocked, owned = 1, BH enabled
2393 bool lock_sock_fast(struct sock *sk)
2396 spin_lock_bh(&sk->sk_lock.slock);
2398 if (!sk->sk_lock.owned)
2400 * Note : We must disable BH
2405 sk->sk_lock.owned = 1;
2406 spin_unlock(&sk->sk_lock.slock);
2408 * The sk_lock has mutex_lock() semantics here:
2410 mutex_acquire(&sk->sk_lock.dep_map, 0, 0, _RET_IP_);
2414 EXPORT_SYMBOL(lock_sock_fast);
2416 int sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp)
2419 if (!sock_flag(sk, SOCK_TIMESTAMP))
2420 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
2421 tv = ktime_to_timeval(sk->sk_stamp);
2422 if (tv.tv_sec == -1)
2424 if (tv.tv_sec == 0) {
2425 sk->sk_stamp = ktime_get_real();
2426 tv = ktime_to_timeval(sk->sk_stamp);
2428 return copy_to_user(userstamp, &tv, sizeof(tv)) ? -EFAULT : 0;
2430 EXPORT_SYMBOL(sock_get_timestamp);
2432 int sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp)
2435 if (!sock_flag(sk, SOCK_TIMESTAMP))
2436 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
2437 ts = ktime_to_timespec(sk->sk_stamp);
2438 if (ts.tv_sec == -1)
2440 if (ts.tv_sec == 0) {
2441 sk->sk_stamp = ktime_get_real();
2442 ts = ktime_to_timespec(sk->sk_stamp);
2444 return copy_to_user(userstamp, &ts, sizeof(ts)) ? -EFAULT : 0;
2446 EXPORT_SYMBOL(sock_get_timestampns);
2448 void sock_enable_timestamp(struct sock *sk, int flag)
2450 if (!sock_flag(sk, flag)) {
2451 unsigned long previous_flags = sk->sk_flags;
2453 sock_set_flag(sk, flag);
2455 * we just set one of the two flags which require net
2456 * time stamping, but time stamping might have been on
2457 * already because of the other one
2459 if (!(previous_flags & SK_FLAGS_TIMESTAMP))
2460 net_enable_timestamp();
2464 int sock_recv_errqueue(struct sock *sk, struct msghdr *msg, int len,
2465 int level, int type)
2467 struct sock_exterr_skb *serr;
2468 struct sk_buff *skb, *skb2;
2472 skb = skb_dequeue(&sk->sk_error_queue);
2478 msg->msg_flags |= MSG_TRUNC;
2481 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
2485 sock_recv_timestamp(msg, sk, skb);
2487 serr = SKB_EXT_ERR(skb);
2488 put_cmsg(msg, level, type, sizeof(serr->ee), &serr->ee);
2490 msg->msg_flags |= MSG_ERRQUEUE;
2493 /* Reset and regenerate socket error */
2494 spin_lock_bh(&sk->sk_error_queue.lock);
2496 if ((skb2 = skb_peek(&sk->sk_error_queue)) != NULL) {
2497 sk->sk_err = SKB_EXT_ERR(skb2)->ee.ee_errno;
2498 spin_unlock_bh(&sk->sk_error_queue.lock);
2499 sk->sk_error_report(sk);
2501 spin_unlock_bh(&sk->sk_error_queue.lock);
2508 EXPORT_SYMBOL(sock_recv_errqueue);
2511 * Get a socket option on an socket.
2513 * FIX: POSIX 1003.1g is very ambiguous here. It states that
2514 * asynchronous errors should be reported by getsockopt. We assume
2515 * this means if you specify SO_ERROR (otherwise whats the point of it).
2517 int sock_common_getsockopt(struct socket *sock, int level, int optname,
2518 char __user *optval, int __user *optlen)
2520 struct sock *sk = sock->sk;
2522 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
2524 EXPORT_SYMBOL(sock_common_getsockopt);
2526 #ifdef CONFIG_COMPAT
2527 int compat_sock_common_getsockopt(struct socket *sock, int level, int optname,
2528 char __user *optval, int __user *optlen)
2530 struct sock *sk = sock->sk;
2532 if (sk->sk_prot->compat_getsockopt != NULL)
2533 return sk->sk_prot->compat_getsockopt(sk, level, optname,
2535 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
2537 EXPORT_SYMBOL(compat_sock_common_getsockopt);
2540 int sock_common_recvmsg(struct kiocb *iocb, struct socket *sock,
2541 struct msghdr *msg, size_t size, int flags)
2543 struct sock *sk = sock->sk;
2547 err = sk->sk_prot->recvmsg(iocb, sk, msg, size, flags & MSG_DONTWAIT,
2548 flags & ~MSG_DONTWAIT, &addr_len);
2550 msg->msg_namelen = addr_len;
2553 EXPORT_SYMBOL(sock_common_recvmsg);
2556 * Set socket options on an inet socket.
2558 int sock_common_setsockopt(struct socket *sock, int level, int optname,
2559 char __user *optval, unsigned int optlen)
2561 struct sock *sk = sock->sk;
2563 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
2565 EXPORT_SYMBOL(sock_common_setsockopt);
2567 #ifdef CONFIG_COMPAT
2568 int compat_sock_common_setsockopt(struct socket *sock, int level, int optname,
2569 char __user *optval, unsigned int optlen)
2571 struct sock *sk = sock->sk;
2573 if (sk->sk_prot->compat_setsockopt != NULL)
2574 return sk->sk_prot->compat_setsockopt(sk, level, optname,
2576 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
2578 EXPORT_SYMBOL(compat_sock_common_setsockopt);
2581 void sk_common_release(struct sock *sk)
2583 if (sk->sk_prot->destroy)
2584 sk->sk_prot->destroy(sk);
2587 * Observation: when sock_common_release is called, processes have
2588 * no access to socket. But net still has.
2589 * Step one, detach it from networking:
2591 * A. Remove from hash tables.
2594 sk->sk_prot->unhash(sk);
2597 * In this point socket cannot receive new packets, but it is possible
2598 * that some packets are in flight because some CPU runs receiver and
2599 * did hash table lookup before we unhashed socket. They will achieve
2600 * receive queue and will be purged by socket destructor.
2602 * Also we still have packets pending on receive queue and probably,
2603 * our own packets waiting in device queues. sock_destroy will drain
2604 * receive queue, but transmitted packets will delay socket destruction
2605 * until the last reference will be released.
2610 xfrm_sk_free_policy(sk);
2612 sk_refcnt_debug_release(sk);
2614 if (sk->sk_frag.page) {
2615 put_page(sk->sk_frag.page);
2616 sk->sk_frag.page = NULL;
2621 EXPORT_SYMBOL(sk_common_release);
2623 #ifdef CONFIG_PROC_FS
2624 #define PROTO_INUSE_NR 64 /* should be enough for the first time */
2626 int val[PROTO_INUSE_NR];
2629 static DECLARE_BITMAP(proto_inuse_idx, PROTO_INUSE_NR);
2631 #ifdef CONFIG_NET_NS
2632 void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
2634 __this_cpu_add(net->core.inuse->val[prot->inuse_idx], val);
2636 EXPORT_SYMBOL_GPL(sock_prot_inuse_add);
2638 int sock_prot_inuse_get(struct net *net, struct proto *prot)
2640 int cpu, idx = prot->inuse_idx;
2643 for_each_possible_cpu(cpu)
2644 res += per_cpu_ptr(net->core.inuse, cpu)->val[idx];
2646 return res >= 0 ? res : 0;
2648 EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
2650 static int __net_init sock_inuse_init_net(struct net *net)
2652 net->core.inuse = alloc_percpu(struct prot_inuse);
2653 return net->core.inuse ? 0 : -ENOMEM;
2656 static void __net_exit sock_inuse_exit_net(struct net *net)
2658 free_percpu(net->core.inuse);
2661 static struct pernet_operations net_inuse_ops = {
2662 .init = sock_inuse_init_net,
2663 .exit = sock_inuse_exit_net,
2666 static __init int net_inuse_init(void)
2668 if (register_pernet_subsys(&net_inuse_ops))
2669 panic("Cannot initialize net inuse counters");
2674 core_initcall(net_inuse_init);
2676 static DEFINE_PER_CPU(struct prot_inuse, prot_inuse);
2678 void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
2680 __this_cpu_add(prot_inuse.val[prot->inuse_idx], val);
2682 EXPORT_SYMBOL_GPL(sock_prot_inuse_add);
2684 int sock_prot_inuse_get(struct net *net, struct proto *prot)
2686 int cpu, idx = prot->inuse_idx;
2689 for_each_possible_cpu(cpu)
2690 res += per_cpu(prot_inuse, cpu).val[idx];
2692 return res >= 0 ? res : 0;
2694 EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
2697 static void assign_proto_idx(struct proto *prot)
2699 prot->inuse_idx = find_first_zero_bit(proto_inuse_idx, PROTO_INUSE_NR);
2701 if (unlikely(prot->inuse_idx == PROTO_INUSE_NR - 1)) {
2702 pr_err("PROTO_INUSE_NR exhausted\n");
2706 set_bit(prot->inuse_idx, proto_inuse_idx);
2709 static void release_proto_idx(struct proto *prot)
2711 if (prot->inuse_idx != PROTO_INUSE_NR - 1)
2712 clear_bit(prot->inuse_idx, proto_inuse_idx);
2715 static inline void assign_proto_idx(struct proto *prot)
2719 static inline void release_proto_idx(struct proto *prot)
2724 int proto_register(struct proto *prot, int alloc_slab)
2727 prot->slab = kmem_cache_create(prot->name, prot->obj_size, 0,
2728 SLAB_HWCACHE_ALIGN | prot->slab_flags,
2731 if (prot->slab == NULL) {
2732 pr_crit("%s: Can't create sock SLAB cache!\n",
2737 if (prot->rsk_prot != NULL) {
2738 prot->rsk_prot->slab_name = kasprintf(GFP_KERNEL, "request_sock_%s", prot->name);
2739 if (prot->rsk_prot->slab_name == NULL)
2740 goto out_free_sock_slab;
2742 prot->rsk_prot->slab = kmem_cache_create(prot->rsk_prot->slab_name,
2743 prot->rsk_prot->obj_size, 0,
2744 SLAB_HWCACHE_ALIGN, NULL);
2746 if (prot->rsk_prot->slab == NULL) {
2747 pr_crit("%s: Can't create request sock SLAB cache!\n",
2749 goto out_free_request_sock_slab_name;
2753 if (prot->twsk_prot != NULL) {
2754 prot->twsk_prot->twsk_slab_name = kasprintf(GFP_KERNEL, "tw_sock_%s", prot->name);
2756 if (prot->twsk_prot->twsk_slab_name == NULL)
2757 goto out_free_request_sock_slab;
2759 prot->twsk_prot->twsk_slab =
2760 kmem_cache_create(prot->twsk_prot->twsk_slab_name,
2761 prot->twsk_prot->twsk_obj_size,
2763 SLAB_HWCACHE_ALIGN |
2766 if (prot->twsk_prot->twsk_slab == NULL)
2767 goto out_free_timewait_sock_slab_name;
2771 mutex_lock(&proto_list_mutex);
2772 list_add(&prot->node, &proto_list);
2773 assign_proto_idx(prot);
2774 mutex_unlock(&proto_list_mutex);
2777 out_free_timewait_sock_slab_name:
2778 kfree(prot->twsk_prot->twsk_slab_name);
2779 out_free_request_sock_slab:
2780 if (prot->rsk_prot && prot->rsk_prot->slab) {
2781 kmem_cache_destroy(prot->rsk_prot->slab);
2782 prot->rsk_prot->slab = NULL;
2784 out_free_request_sock_slab_name:
2786 kfree(prot->rsk_prot->slab_name);
2788 kmem_cache_destroy(prot->slab);
2793 EXPORT_SYMBOL(proto_register);
2795 void proto_unregister(struct proto *prot)
2797 mutex_lock(&proto_list_mutex);
2798 release_proto_idx(prot);
2799 list_del(&prot->node);
2800 mutex_unlock(&proto_list_mutex);
2802 if (prot->slab != NULL) {
2803 kmem_cache_destroy(prot->slab);
2807 if (prot->rsk_prot != NULL && prot->rsk_prot->slab != NULL) {
2808 kmem_cache_destroy(prot->rsk_prot->slab);
2809 kfree(prot->rsk_prot->slab_name);
2810 prot->rsk_prot->slab = NULL;
2813 if (prot->twsk_prot != NULL && prot->twsk_prot->twsk_slab != NULL) {
2814 kmem_cache_destroy(prot->twsk_prot->twsk_slab);
2815 kfree(prot->twsk_prot->twsk_slab_name);
2816 prot->twsk_prot->twsk_slab = NULL;
2819 EXPORT_SYMBOL(proto_unregister);
2821 #ifdef CONFIG_PROC_FS
2822 static void *proto_seq_start(struct seq_file *seq, loff_t *pos)
2823 __acquires(proto_list_mutex)
2825 mutex_lock(&proto_list_mutex);
2826 return seq_list_start_head(&proto_list, *pos);
2829 static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2831 return seq_list_next(v, &proto_list, pos);
2834 static void proto_seq_stop(struct seq_file *seq, void *v)
2835 __releases(proto_list_mutex)
2837 mutex_unlock(&proto_list_mutex);
2840 static char proto_method_implemented(const void *method)
2842 return method == NULL ? 'n' : 'y';
2844 static long sock_prot_memory_allocated(struct proto *proto)
2846 return proto->memory_allocated != NULL ? proto_memory_allocated(proto) : -1L;
2849 static char *sock_prot_memory_pressure(struct proto *proto)
2851 return proto->memory_pressure != NULL ?
2852 proto_memory_pressure(proto) ? "yes" : "no" : "NI";
2855 static void proto_seq_printf(struct seq_file *seq, struct proto *proto)
2858 seq_printf(seq, "%-9s %4u %6d %6ld %-3s %6u %-3s %-10s "
2859 "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n",
2862 sock_prot_inuse_get(seq_file_net(seq), proto),
2863 sock_prot_memory_allocated(proto),
2864 sock_prot_memory_pressure(proto),
2866 proto->slab == NULL ? "no" : "yes",
2867 module_name(proto->owner),
2868 proto_method_implemented(proto->close),
2869 proto_method_implemented(proto->connect),
2870 proto_method_implemented(proto->disconnect),
2871 proto_method_implemented(proto->accept),
2872 proto_method_implemented(proto->ioctl),
2873 proto_method_implemented(proto->init),
2874 proto_method_implemented(proto->destroy),
2875 proto_method_implemented(proto->shutdown),
2876 proto_method_implemented(proto->setsockopt),
2877 proto_method_implemented(proto->getsockopt),
2878 proto_method_implemented(proto->sendmsg),
2879 proto_method_implemented(proto->recvmsg),
2880 proto_method_implemented(proto->sendpage),
2881 proto_method_implemented(proto->bind),
2882 proto_method_implemented(proto->backlog_rcv),
2883 proto_method_implemented(proto->hash),
2884 proto_method_implemented(proto->unhash),
2885 proto_method_implemented(proto->get_port),
2886 proto_method_implemented(proto->enter_memory_pressure));
2889 static int proto_seq_show(struct seq_file *seq, void *v)
2891 if (v == &proto_list)
2892 seq_printf(seq, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s",
2901 "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n");
2903 proto_seq_printf(seq, list_entry(v, struct proto, node));
2907 static const struct seq_operations proto_seq_ops = {
2908 .start = proto_seq_start,
2909 .next = proto_seq_next,
2910 .stop = proto_seq_stop,
2911 .show = proto_seq_show,
2914 static int proto_seq_open(struct inode *inode, struct file *file)
2916 return seq_open_net(inode, file, &proto_seq_ops,
2917 sizeof(struct seq_net_private));
2920 static const struct file_operations proto_seq_fops = {
2921 .owner = THIS_MODULE,
2922 .open = proto_seq_open,
2924 .llseek = seq_lseek,
2925 .release = seq_release_net,
2928 static __net_init int proto_init_net(struct net *net)
2930 if (!proc_create("protocols", S_IRUGO, net->proc_net, &proto_seq_fops))
2936 static __net_exit void proto_exit_net(struct net *net)
2938 remove_proc_entry("protocols", net->proc_net);
2942 static __net_initdata struct pernet_operations proto_net_ops = {
2943 .init = proto_init_net,
2944 .exit = proto_exit_net,
2947 static int __init proto_init(void)
2949 return register_pernet_subsys(&proto_net_ops);
2952 subsys_initcall(proto_init);
2954 #endif /* PROC_FS */