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/types.h>
97 #include <linux/socket.h>
99 #include <linux/kernel.h>
100 #include <linux/module.h>
101 #include <linux/proc_fs.h>
102 #include <linux/seq_file.h>
103 #include <linux/sched.h>
104 #include <linux/timer.h>
105 #include <linux/string.h>
106 #include <linux/sockios.h>
107 #include <linux/net.h>
108 #include <linux/mm.h>
109 #include <linux/slab.h>
110 #include <linux/interrupt.h>
111 #include <linux/poll.h>
112 #include <linux/tcp.h>
113 #include <linux/init.h>
114 #include <linux/highmem.h>
115 #include <linux/user_namespace.h>
116 #include <linux/static_key.h>
117 #include <linux/memcontrol.h>
118 #include <linux/prefetch.h>
120 #include <asm/uaccess.h>
122 #include <linux/netdevice.h>
123 #include <net/protocol.h>
124 #include <linux/skbuff.h>
125 #include <net/net_namespace.h>
126 #include <net/request_sock.h>
127 #include <net/sock.h>
128 #include <linux/net_tstamp.h>
129 #include <net/xfrm.h>
130 #include <linux/ipsec.h>
131 #include <net/cls_cgroup.h>
132 #include <net/netprio_cgroup.h>
134 #include <linux/filter.h>
136 #include <trace/events/sock.h>
142 static DEFINE_MUTEX(proto_list_mutex);
143 static LIST_HEAD(proto_list);
145 #ifdef CONFIG_MEMCG_KMEM
146 int mem_cgroup_sockets_init(struct mem_cgroup *memcg, struct cgroup_subsys *ss)
151 mutex_lock(&proto_list_mutex);
152 list_for_each_entry(proto, &proto_list, node) {
153 if (proto->init_cgroup) {
154 ret = proto->init_cgroup(memcg, ss);
160 mutex_unlock(&proto_list_mutex);
163 list_for_each_entry_continue_reverse(proto, &proto_list, node)
164 if (proto->destroy_cgroup)
165 proto->destroy_cgroup(memcg);
166 mutex_unlock(&proto_list_mutex);
170 void mem_cgroup_sockets_destroy(struct mem_cgroup *memcg)
174 mutex_lock(&proto_list_mutex);
175 list_for_each_entry_reverse(proto, &proto_list, node)
176 if (proto->destroy_cgroup)
177 proto->destroy_cgroup(memcg);
178 mutex_unlock(&proto_list_mutex);
183 * Each address family might have different locking rules, so we have
184 * one slock key per address family:
186 static struct lock_class_key af_family_keys[AF_MAX];
187 static struct lock_class_key af_family_slock_keys[AF_MAX];
189 struct static_key memcg_socket_limit_enabled;
190 EXPORT_SYMBOL(memcg_socket_limit_enabled);
193 * Make lock validator output more readable. (we pre-construct these
194 * strings build-time, so that runtime initialization of socket
197 static const char *const af_family_key_strings[AF_MAX+1] = {
198 "sk_lock-AF_UNSPEC", "sk_lock-AF_UNIX" , "sk_lock-AF_INET" ,
199 "sk_lock-AF_AX25" , "sk_lock-AF_IPX" , "sk_lock-AF_APPLETALK",
200 "sk_lock-AF_NETROM", "sk_lock-AF_BRIDGE" , "sk_lock-AF_ATMPVC" ,
201 "sk_lock-AF_X25" , "sk_lock-AF_INET6" , "sk_lock-AF_ROSE" ,
202 "sk_lock-AF_DECnet", "sk_lock-AF_NETBEUI" , "sk_lock-AF_SECURITY" ,
203 "sk_lock-AF_KEY" , "sk_lock-AF_NETLINK" , "sk_lock-AF_PACKET" ,
204 "sk_lock-AF_ASH" , "sk_lock-AF_ECONET" , "sk_lock-AF_ATMSVC" ,
205 "sk_lock-AF_RDS" , "sk_lock-AF_SNA" , "sk_lock-AF_IRDA" ,
206 "sk_lock-AF_PPPOX" , "sk_lock-AF_WANPIPE" , "sk_lock-AF_LLC" ,
207 "sk_lock-27" , "sk_lock-28" , "sk_lock-AF_CAN" ,
208 "sk_lock-AF_TIPC" , "sk_lock-AF_BLUETOOTH", "sk_lock-IUCV" ,
209 "sk_lock-AF_RXRPC" , "sk_lock-AF_ISDN" , "sk_lock-AF_PHONET" ,
210 "sk_lock-AF_IEEE802154", "sk_lock-AF_CAIF" , "sk_lock-AF_ALG" ,
211 "sk_lock-AF_NFC" , "sk_lock-AF_MAX"
213 static const char *const af_family_slock_key_strings[AF_MAX+1] = {
214 "slock-AF_UNSPEC", "slock-AF_UNIX" , "slock-AF_INET" ,
215 "slock-AF_AX25" , "slock-AF_IPX" , "slock-AF_APPLETALK",
216 "slock-AF_NETROM", "slock-AF_BRIDGE" , "slock-AF_ATMPVC" ,
217 "slock-AF_X25" , "slock-AF_INET6" , "slock-AF_ROSE" ,
218 "slock-AF_DECnet", "slock-AF_NETBEUI" , "slock-AF_SECURITY" ,
219 "slock-AF_KEY" , "slock-AF_NETLINK" , "slock-AF_PACKET" ,
220 "slock-AF_ASH" , "slock-AF_ECONET" , "slock-AF_ATMSVC" ,
221 "slock-AF_RDS" , "slock-AF_SNA" , "slock-AF_IRDA" ,
222 "slock-AF_PPPOX" , "slock-AF_WANPIPE" , "slock-AF_LLC" ,
223 "slock-27" , "slock-28" , "slock-AF_CAN" ,
224 "slock-AF_TIPC" , "slock-AF_BLUETOOTH", "slock-AF_IUCV" ,
225 "slock-AF_RXRPC" , "slock-AF_ISDN" , "slock-AF_PHONET" ,
226 "slock-AF_IEEE802154", "slock-AF_CAIF" , "slock-AF_ALG" ,
227 "slock-AF_NFC" , "slock-AF_MAX"
229 static const char *const af_family_clock_key_strings[AF_MAX+1] = {
230 "clock-AF_UNSPEC", "clock-AF_UNIX" , "clock-AF_INET" ,
231 "clock-AF_AX25" , "clock-AF_IPX" , "clock-AF_APPLETALK",
232 "clock-AF_NETROM", "clock-AF_BRIDGE" , "clock-AF_ATMPVC" ,
233 "clock-AF_X25" , "clock-AF_INET6" , "clock-AF_ROSE" ,
234 "clock-AF_DECnet", "clock-AF_NETBEUI" , "clock-AF_SECURITY" ,
235 "clock-AF_KEY" , "clock-AF_NETLINK" , "clock-AF_PACKET" ,
236 "clock-AF_ASH" , "clock-AF_ECONET" , "clock-AF_ATMSVC" ,
237 "clock-AF_RDS" , "clock-AF_SNA" , "clock-AF_IRDA" ,
238 "clock-AF_PPPOX" , "clock-AF_WANPIPE" , "clock-AF_LLC" ,
239 "clock-27" , "clock-28" , "clock-AF_CAN" ,
240 "clock-AF_TIPC" , "clock-AF_BLUETOOTH", "clock-AF_IUCV" ,
241 "clock-AF_RXRPC" , "clock-AF_ISDN" , "clock-AF_PHONET" ,
242 "clock-AF_IEEE802154", "clock-AF_CAIF" , "clock-AF_ALG" ,
243 "clock-AF_NFC" , "clock-AF_MAX"
247 * sk_callback_lock locking rules are per-address-family,
248 * so split the lock classes by using a per-AF key:
250 static struct lock_class_key af_callback_keys[AF_MAX];
252 /* Take into consideration the size of the struct sk_buff overhead in the
253 * determination of these values, since that is non-constant across
254 * platforms. This makes socket queueing behavior and performance
255 * not depend upon such differences.
257 #define _SK_MEM_PACKETS 256
258 #define _SK_MEM_OVERHEAD SKB_TRUESIZE(256)
259 #define SK_WMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS)
260 #define SK_RMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS)
262 /* Run time adjustable parameters. */
263 __u32 sysctl_wmem_max __read_mostly = SK_WMEM_MAX;
264 EXPORT_SYMBOL(sysctl_wmem_max);
265 __u32 sysctl_rmem_max __read_mostly = SK_RMEM_MAX;
266 EXPORT_SYMBOL(sysctl_rmem_max);
267 __u32 sysctl_wmem_default __read_mostly = SK_WMEM_MAX;
268 __u32 sysctl_rmem_default __read_mostly = SK_RMEM_MAX;
270 /* Maximal space eaten by iovec or ancillary data plus some space */
271 int sysctl_optmem_max __read_mostly = sizeof(unsigned long)*(2*UIO_MAXIOV+512);
272 EXPORT_SYMBOL(sysctl_optmem_max);
274 struct static_key memalloc_socks = STATIC_KEY_INIT_FALSE;
275 EXPORT_SYMBOL_GPL(memalloc_socks);
278 * sk_set_memalloc - sets %SOCK_MEMALLOC
279 * @sk: socket to set it on
281 * Set %SOCK_MEMALLOC on a socket for access to emergency reserves.
282 * It's the responsibility of the admin to adjust min_free_kbytes
283 * to meet the requirements
285 void sk_set_memalloc(struct sock *sk)
287 sock_set_flag(sk, SOCK_MEMALLOC);
288 sk->sk_allocation |= __GFP_MEMALLOC;
289 static_key_slow_inc(&memalloc_socks);
291 EXPORT_SYMBOL_GPL(sk_set_memalloc);
293 void sk_clear_memalloc(struct sock *sk)
295 sock_reset_flag(sk, SOCK_MEMALLOC);
296 sk->sk_allocation &= ~__GFP_MEMALLOC;
297 static_key_slow_dec(&memalloc_socks);
300 * SOCK_MEMALLOC is allowed to ignore rmem limits to ensure forward
301 * progress of swapping. However, if SOCK_MEMALLOC is cleared while
302 * it has rmem allocations there is a risk that the user of the
303 * socket cannot make forward progress due to exceeding the rmem
304 * limits. By rights, sk_clear_memalloc() should only be called
305 * on sockets being torn down but warn and reset the accounting if
306 * that assumption breaks.
308 if (WARN_ON(sk->sk_forward_alloc))
311 EXPORT_SYMBOL_GPL(sk_clear_memalloc);
313 int __sk_backlog_rcv(struct sock *sk, struct sk_buff *skb)
316 unsigned long pflags = current->flags;
318 /* these should have been dropped before queueing */
319 BUG_ON(!sock_flag(sk, SOCK_MEMALLOC));
321 current->flags |= PF_MEMALLOC;
322 ret = sk->sk_backlog_rcv(sk, skb);
323 tsk_restore_flags(current, pflags, PF_MEMALLOC);
327 EXPORT_SYMBOL(__sk_backlog_rcv);
329 #if defined(CONFIG_CGROUPS)
330 #if !defined(CONFIG_NET_CLS_CGROUP)
331 int net_cls_subsys_id = -1;
332 EXPORT_SYMBOL_GPL(net_cls_subsys_id);
334 #if !defined(CONFIG_NETPRIO_CGROUP)
335 int net_prio_subsys_id = -1;
336 EXPORT_SYMBOL_GPL(net_prio_subsys_id);
340 static int sock_set_timeout(long *timeo_p, char __user *optval, int optlen)
344 if (optlen < sizeof(tv))
346 if (copy_from_user(&tv, optval, sizeof(tv)))
348 if (tv.tv_usec < 0 || tv.tv_usec >= USEC_PER_SEC)
352 static int warned __read_mostly;
355 if (warned < 10 && net_ratelimit()) {
357 pr_info("%s: `%s' (pid %d) tries to set negative timeout\n",
358 __func__, current->comm, task_pid_nr(current));
362 *timeo_p = MAX_SCHEDULE_TIMEOUT;
363 if (tv.tv_sec == 0 && tv.tv_usec == 0)
365 if (tv.tv_sec < (MAX_SCHEDULE_TIMEOUT/HZ - 1))
366 *timeo_p = tv.tv_sec*HZ + (tv.tv_usec+(1000000/HZ-1))/(1000000/HZ);
370 static void sock_warn_obsolete_bsdism(const char *name)
373 static char warncomm[TASK_COMM_LEN];
374 if (strcmp(warncomm, current->comm) && warned < 5) {
375 strcpy(warncomm, current->comm);
376 pr_warn("process `%s' is using obsolete %s SO_BSDCOMPAT\n",
382 #define SK_FLAGS_TIMESTAMP ((1UL << SOCK_TIMESTAMP) | (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE))
384 static void sock_disable_timestamp(struct sock *sk, unsigned long flags)
386 if (sk->sk_flags & flags) {
387 sk->sk_flags &= ~flags;
388 if (!(sk->sk_flags & SK_FLAGS_TIMESTAMP))
389 net_disable_timestamp();
394 int sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
399 struct sk_buff_head *list = &sk->sk_receive_queue;
401 if (atomic_read(&sk->sk_rmem_alloc) >= sk->sk_rcvbuf) {
402 atomic_inc(&sk->sk_drops);
403 trace_sock_rcvqueue_full(sk, skb);
407 err = sk_filter(sk, skb);
411 if (!sk_rmem_schedule(sk, skb, skb->truesize)) {
412 atomic_inc(&sk->sk_drops);
417 skb_set_owner_r(skb, sk);
419 /* Cache the SKB length before we tack it onto the receive
420 * queue. Once it is added it no longer belongs to us and
421 * may be freed by other threads of control pulling packets
426 /* we escape from rcu protected region, make sure we dont leak
431 spin_lock_irqsave(&list->lock, flags);
432 skb->dropcount = atomic_read(&sk->sk_drops);
433 __skb_queue_tail(list, skb);
434 spin_unlock_irqrestore(&list->lock, flags);
436 if (!sock_flag(sk, SOCK_DEAD))
437 sk->sk_data_ready(sk, skb_len);
440 EXPORT_SYMBOL(sock_queue_rcv_skb);
442 int sk_receive_skb(struct sock *sk, struct sk_buff *skb, const int nested)
444 int rc = NET_RX_SUCCESS;
446 if (sk_filter(sk, skb))
447 goto discard_and_relse;
451 if (sk_rcvqueues_full(sk, skb, sk->sk_rcvbuf)) {
452 atomic_inc(&sk->sk_drops);
453 goto discard_and_relse;
456 bh_lock_sock_nested(sk);
459 if (!sock_owned_by_user(sk)) {
461 * trylock + unlock semantics:
463 mutex_acquire(&sk->sk_lock.dep_map, 0, 1, _RET_IP_);
465 rc = sk_backlog_rcv(sk, skb);
467 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_);
468 } else if (sk_add_backlog(sk, skb, sk->sk_rcvbuf)) {
470 atomic_inc(&sk->sk_drops);
471 goto discard_and_relse;
482 EXPORT_SYMBOL(sk_receive_skb);
484 void sk_reset_txq(struct sock *sk)
486 sk_tx_queue_clear(sk);
488 EXPORT_SYMBOL(sk_reset_txq);
490 struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie)
492 struct dst_entry *dst = __sk_dst_get(sk);
494 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
495 sk_tx_queue_clear(sk);
496 RCU_INIT_POINTER(sk->sk_dst_cache, NULL);
503 EXPORT_SYMBOL(__sk_dst_check);
505 struct dst_entry *sk_dst_check(struct sock *sk, u32 cookie)
507 struct dst_entry *dst = sk_dst_get(sk);
509 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
517 EXPORT_SYMBOL(sk_dst_check);
519 static int sock_bindtodevice(struct sock *sk, char __user *optval, int optlen)
521 int ret = -ENOPROTOOPT;
522 #ifdef CONFIG_NETDEVICES
523 struct net *net = sock_net(sk);
524 char devname[IFNAMSIZ];
529 if (!capable(CAP_NET_RAW))
536 /* Bind this socket to a particular device like "eth0",
537 * as specified in the passed interface name. If the
538 * name is "" or the option length is zero the socket
541 if (optlen > IFNAMSIZ - 1)
542 optlen = IFNAMSIZ - 1;
543 memset(devname, 0, sizeof(devname));
546 if (copy_from_user(devname, optval, optlen))
550 if (devname[0] != '\0') {
551 struct net_device *dev;
554 dev = dev_get_by_name_rcu(net, devname);
556 index = dev->ifindex;
564 sk->sk_bound_dev_if = index;
576 static inline void sock_valbool_flag(struct sock *sk, int bit, int valbool)
579 sock_set_flag(sk, bit);
581 sock_reset_flag(sk, bit);
585 * This is meant for all protocols to use and covers goings on
586 * at the socket level. Everything here is generic.
589 int sock_setsockopt(struct socket *sock, int level, int optname,
590 char __user *optval, unsigned int optlen)
592 struct sock *sk = sock->sk;
599 * Options without arguments
602 if (optname == SO_BINDTODEVICE)
603 return sock_bindtodevice(sk, optval, optlen);
605 if (optlen < sizeof(int))
608 if (get_user(val, (int __user *)optval))
611 valbool = val ? 1 : 0;
617 if (val && !capable(CAP_NET_ADMIN))
620 sock_valbool_flag(sk, SOCK_DBG, valbool);
623 sk->sk_reuse = (valbool ? SK_CAN_REUSE : SK_NO_REUSE);
632 sock_valbool_flag(sk, SOCK_LOCALROUTE, valbool);
635 sock_valbool_flag(sk, SOCK_BROADCAST, valbool);
638 /* Don't error on this BSD doesn't and if you think
639 * about it this is right. Otherwise apps have to
640 * play 'guess the biggest size' games. RCVBUF/SNDBUF
641 * are treated in BSD as hints
643 val = min_t(u32, val, sysctl_wmem_max);
645 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
646 sk->sk_sndbuf = max_t(u32, val * 2, SOCK_MIN_SNDBUF);
647 /* Wake up sending tasks if we upped the value. */
648 sk->sk_write_space(sk);
652 if (!capable(CAP_NET_ADMIN)) {
659 /* Don't error on this BSD doesn't and if you think
660 * about it this is right. Otherwise apps have to
661 * play 'guess the biggest size' games. RCVBUF/SNDBUF
662 * are treated in BSD as hints
664 val = min_t(u32, val, sysctl_rmem_max);
666 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
668 * We double it on the way in to account for
669 * "struct sk_buff" etc. overhead. Applications
670 * assume that the SO_RCVBUF setting they make will
671 * allow that much actual data to be received on that
674 * Applications are unaware that "struct sk_buff" and
675 * other overheads allocate from the receive buffer
676 * during socket buffer allocation.
678 * And after considering the possible alternatives,
679 * returning the value we actually used in getsockopt
680 * is the most desirable behavior.
682 sk->sk_rcvbuf = max_t(u32, val * 2, SOCK_MIN_RCVBUF);
686 if (!capable(CAP_NET_ADMIN)) {
694 if (sk->sk_protocol == IPPROTO_TCP)
695 tcp_set_keepalive(sk, valbool);
697 sock_valbool_flag(sk, SOCK_KEEPOPEN, valbool);
701 sock_valbool_flag(sk, SOCK_URGINLINE, valbool);
705 sk->sk_no_check = valbool;
709 if ((val >= 0 && val <= 6) || capable(CAP_NET_ADMIN))
710 sk->sk_priority = val;
716 if (optlen < sizeof(ling)) {
717 ret = -EINVAL; /* 1003.1g */
720 if (copy_from_user(&ling, optval, sizeof(ling))) {
725 sock_reset_flag(sk, SOCK_LINGER);
727 #if (BITS_PER_LONG == 32)
728 if ((unsigned int)ling.l_linger >= MAX_SCHEDULE_TIMEOUT/HZ)
729 sk->sk_lingertime = MAX_SCHEDULE_TIMEOUT;
732 sk->sk_lingertime = (unsigned int)ling.l_linger * HZ;
733 sock_set_flag(sk, SOCK_LINGER);
738 sock_warn_obsolete_bsdism("setsockopt");
743 set_bit(SOCK_PASSCRED, &sock->flags);
745 clear_bit(SOCK_PASSCRED, &sock->flags);
751 if (optname == SO_TIMESTAMP)
752 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
754 sock_set_flag(sk, SOCK_RCVTSTAMPNS);
755 sock_set_flag(sk, SOCK_RCVTSTAMP);
756 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
758 sock_reset_flag(sk, SOCK_RCVTSTAMP);
759 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
763 case SO_TIMESTAMPING:
764 if (val & ~SOF_TIMESTAMPING_MASK) {
768 sock_valbool_flag(sk, SOCK_TIMESTAMPING_TX_HARDWARE,
769 val & SOF_TIMESTAMPING_TX_HARDWARE);
770 sock_valbool_flag(sk, SOCK_TIMESTAMPING_TX_SOFTWARE,
771 val & SOF_TIMESTAMPING_TX_SOFTWARE);
772 sock_valbool_flag(sk, SOCK_TIMESTAMPING_RX_HARDWARE,
773 val & SOF_TIMESTAMPING_RX_HARDWARE);
774 if (val & SOF_TIMESTAMPING_RX_SOFTWARE)
775 sock_enable_timestamp(sk,
776 SOCK_TIMESTAMPING_RX_SOFTWARE);
778 sock_disable_timestamp(sk,
779 (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE));
780 sock_valbool_flag(sk, SOCK_TIMESTAMPING_SOFTWARE,
781 val & SOF_TIMESTAMPING_SOFTWARE);
782 sock_valbool_flag(sk, SOCK_TIMESTAMPING_SYS_HARDWARE,
783 val & SOF_TIMESTAMPING_SYS_HARDWARE);
784 sock_valbool_flag(sk, SOCK_TIMESTAMPING_RAW_HARDWARE,
785 val & SOF_TIMESTAMPING_RAW_HARDWARE);
791 sk->sk_rcvlowat = val ? : 1;
795 ret = sock_set_timeout(&sk->sk_rcvtimeo, optval, optlen);
799 ret = sock_set_timeout(&sk->sk_sndtimeo, optval, optlen);
802 case SO_ATTACH_FILTER:
804 if (optlen == sizeof(struct sock_fprog)) {
805 struct sock_fprog fprog;
808 if (copy_from_user(&fprog, optval, sizeof(fprog)))
811 ret = sk_attach_filter(&fprog, sk);
815 case SO_DETACH_FILTER:
816 ret = sk_detach_filter(sk);
821 set_bit(SOCK_PASSSEC, &sock->flags);
823 clear_bit(SOCK_PASSSEC, &sock->flags);
826 if (!capable(CAP_NET_ADMIN))
832 /* We implement the SO_SNDLOWAT etc to
833 not be settable (1003.1g 5.3) */
835 sock_valbool_flag(sk, SOCK_RXQ_OVFL, valbool);
839 sock_valbool_flag(sk, SOCK_WIFI_STATUS, valbool);
843 if (sock->ops->set_peek_off)
844 sock->ops->set_peek_off(sk, val);
850 sock_valbool_flag(sk, SOCK_NOFCS, valbool);
860 EXPORT_SYMBOL(sock_setsockopt);
863 void cred_to_ucred(struct pid *pid, const struct cred *cred,
866 ucred->pid = pid_vnr(pid);
867 ucred->uid = ucred->gid = -1;
869 struct user_namespace *current_ns = current_user_ns();
871 ucred->uid = from_kuid(current_ns, cred->euid);
872 ucred->gid = from_kgid(current_ns, cred->egid);
875 EXPORT_SYMBOL_GPL(cred_to_ucred);
877 int sock_getsockopt(struct socket *sock, int level, int optname,
878 char __user *optval, int __user *optlen)
880 struct sock *sk = sock->sk;
888 int lv = sizeof(int);
891 if (get_user(len, optlen))
896 memset(&v, 0, sizeof(v));
900 v.val = sock_flag(sk, SOCK_DBG);
904 v.val = sock_flag(sk, SOCK_LOCALROUTE);
908 v.val = sock_flag(sk, SOCK_BROADCAST);
912 v.val = sk->sk_sndbuf;
916 v.val = sk->sk_rcvbuf;
920 v.val = sk->sk_reuse;
924 v.val = sock_flag(sk, SOCK_KEEPOPEN);
932 v.val = sk->sk_protocol;
936 v.val = sk->sk_family;
940 v.val = -sock_error(sk);
942 v.val = xchg(&sk->sk_err_soft, 0);
946 v.val = sock_flag(sk, SOCK_URGINLINE);
950 v.val = sk->sk_no_check;
954 v.val = sk->sk_priority;
959 v.ling.l_onoff = sock_flag(sk, SOCK_LINGER);
960 v.ling.l_linger = sk->sk_lingertime / HZ;
964 sock_warn_obsolete_bsdism("getsockopt");
968 v.val = sock_flag(sk, SOCK_RCVTSTAMP) &&
969 !sock_flag(sk, SOCK_RCVTSTAMPNS);
973 v.val = sock_flag(sk, SOCK_RCVTSTAMPNS);
976 case SO_TIMESTAMPING:
978 if (sock_flag(sk, SOCK_TIMESTAMPING_TX_HARDWARE))
979 v.val |= SOF_TIMESTAMPING_TX_HARDWARE;
980 if (sock_flag(sk, SOCK_TIMESTAMPING_TX_SOFTWARE))
981 v.val |= SOF_TIMESTAMPING_TX_SOFTWARE;
982 if (sock_flag(sk, SOCK_TIMESTAMPING_RX_HARDWARE))
983 v.val |= SOF_TIMESTAMPING_RX_HARDWARE;
984 if (sock_flag(sk, SOCK_TIMESTAMPING_RX_SOFTWARE))
985 v.val |= SOF_TIMESTAMPING_RX_SOFTWARE;
986 if (sock_flag(sk, SOCK_TIMESTAMPING_SOFTWARE))
987 v.val |= SOF_TIMESTAMPING_SOFTWARE;
988 if (sock_flag(sk, SOCK_TIMESTAMPING_SYS_HARDWARE))
989 v.val |= SOF_TIMESTAMPING_SYS_HARDWARE;
990 if (sock_flag(sk, SOCK_TIMESTAMPING_RAW_HARDWARE))
991 v.val |= SOF_TIMESTAMPING_RAW_HARDWARE;
995 lv = sizeof(struct timeval);
996 if (sk->sk_rcvtimeo == MAX_SCHEDULE_TIMEOUT) {
1000 v.tm.tv_sec = sk->sk_rcvtimeo / HZ;
1001 v.tm.tv_usec = ((sk->sk_rcvtimeo % HZ) * 1000000) / HZ;
1006 lv = sizeof(struct timeval);
1007 if (sk->sk_sndtimeo == MAX_SCHEDULE_TIMEOUT) {
1011 v.tm.tv_sec = sk->sk_sndtimeo / HZ;
1012 v.tm.tv_usec = ((sk->sk_sndtimeo % HZ) * 1000000) / HZ;
1017 v.val = sk->sk_rcvlowat;
1025 v.val = !!test_bit(SOCK_PASSCRED, &sock->flags);
1030 struct ucred peercred;
1031 if (len > sizeof(peercred))
1032 len = sizeof(peercred);
1033 cred_to_ucred(sk->sk_peer_pid, sk->sk_peer_cred, &peercred);
1034 if (copy_to_user(optval, &peercred, len))
1043 if (sock->ops->getname(sock, (struct sockaddr *)address, &lv, 2))
1047 if (copy_to_user(optval, address, len))
1052 /* Dubious BSD thing... Probably nobody even uses it, but
1053 * the UNIX standard wants it for whatever reason... -DaveM
1056 v.val = sk->sk_state == TCP_LISTEN;
1060 v.val = !!test_bit(SOCK_PASSSEC, &sock->flags);
1064 return security_socket_getpeersec_stream(sock, optval, optlen, len);
1067 v.val = sk->sk_mark;
1071 v.val = sock_flag(sk, SOCK_RXQ_OVFL);
1074 case SO_WIFI_STATUS:
1075 v.val = sock_flag(sk, SOCK_WIFI_STATUS);
1079 if (!sock->ops->set_peek_off)
1082 v.val = sk->sk_peek_off;
1085 v.val = sock_flag(sk, SOCK_NOFCS);
1088 return -ENOPROTOOPT;
1093 if (copy_to_user(optval, &v, len))
1096 if (put_user(len, optlen))
1102 * Initialize an sk_lock.
1104 * (We also register the sk_lock with the lock validator.)
1106 static inline void sock_lock_init(struct sock *sk)
1108 sock_lock_init_class_and_name(sk,
1109 af_family_slock_key_strings[sk->sk_family],
1110 af_family_slock_keys + sk->sk_family,
1111 af_family_key_strings[sk->sk_family],
1112 af_family_keys + sk->sk_family);
1116 * Copy all fields from osk to nsk but nsk->sk_refcnt must not change yet,
1117 * even temporarly, because of RCU lookups. sk_node should also be left as is.
1118 * We must not copy fields between sk_dontcopy_begin and sk_dontcopy_end
1120 static void sock_copy(struct sock *nsk, const struct sock *osk)
1122 #ifdef CONFIG_SECURITY_NETWORK
1123 void *sptr = nsk->sk_security;
1125 memcpy(nsk, osk, offsetof(struct sock, sk_dontcopy_begin));
1127 memcpy(&nsk->sk_dontcopy_end, &osk->sk_dontcopy_end,
1128 osk->sk_prot->obj_size - offsetof(struct sock, sk_dontcopy_end));
1130 #ifdef CONFIG_SECURITY_NETWORK
1131 nsk->sk_security = sptr;
1132 security_sk_clone(osk, nsk);
1137 * caches using SLAB_DESTROY_BY_RCU should let .next pointer from nulls nodes
1138 * un-modified. Special care is taken when initializing object to zero.
1140 static inline void sk_prot_clear_nulls(struct sock *sk, int size)
1142 if (offsetof(struct sock, sk_node.next) != 0)
1143 memset(sk, 0, offsetof(struct sock, sk_node.next));
1144 memset(&sk->sk_node.pprev, 0,
1145 size - offsetof(struct sock, sk_node.pprev));
1148 void sk_prot_clear_portaddr_nulls(struct sock *sk, int size)
1150 unsigned long nulls1, nulls2;
1152 nulls1 = offsetof(struct sock, __sk_common.skc_node.next);
1153 nulls2 = offsetof(struct sock, __sk_common.skc_portaddr_node.next);
1154 if (nulls1 > nulls2)
1155 swap(nulls1, nulls2);
1158 memset((char *)sk, 0, nulls1);
1159 memset((char *)sk + nulls1 + sizeof(void *), 0,
1160 nulls2 - nulls1 - sizeof(void *));
1161 memset((char *)sk + nulls2 + sizeof(void *), 0,
1162 size - nulls2 - sizeof(void *));
1164 EXPORT_SYMBOL(sk_prot_clear_portaddr_nulls);
1166 static struct sock *sk_prot_alloc(struct proto *prot, gfp_t priority,
1170 struct kmem_cache *slab;
1174 sk = kmem_cache_alloc(slab, priority & ~__GFP_ZERO);
1177 if (priority & __GFP_ZERO) {
1179 prot->clear_sk(sk, prot->obj_size);
1181 sk_prot_clear_nulls(sk, prot->obj_size);
1184 sk = kmalloc(prot->obj_size, priority);
1187 kmemcheck_annotate_bitfield(sk, flags);
1189 if (security_sk_alloc(sk, family, priority))
1192 if (!try_module_get(prot->owner))
1194 sk_tx_queue_clear(sk);
1200 security_sk_free(sk);
1203 kmem_cache_free(slab, sk);
1209 static void sk_prot_free(struct proto *prot, struct sock *sk)
1211 struct kmem_cache *slab;
1212 struct module *owner;
1214 owner = prot->owner;
1217 security_sk_free(sk);
1219 kmem_cache_free(slab, sk);
1225 #ifdef CONFIG_CGROUPS
1226 void sock_update_classid(struct sock *sk)
1230 rcu_read_lock(); /* doing current task, which cannot vanish. */
1231 classid = task_cls_classid(current);
1233 if (classid && classid != sk->sk_classid)
1234 sk->sk_classid = classid;
1236 EXPORT_SYMBOL(sock_update_classid);
1238 void sock_update_netprioidx(struct sock *sk, struct task_struct *task)
1243 sk->sk_cgrp_prioidx = task_netprioidx(task);
1245 EXPORT_SYMBOL_GPL(sock_update_netprioidx);
1249 * sk_alloc - All socket objects are allocated here
1250 * @net: the applicable net namespace
1251 * @family: protocol family
1252 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
1253 * @prot: struct proto associated with this new sock instance
1255 struct sock *sk_alloc(struct net *net, int family, gfp_t priority,
1260 sk = sk_prot_alloc(prot, priority | __GFP_ZERO, family);
1262 sk->sk_family = family;
1264 * See comment in struct sock definition to understand
1265 * why we need sk_prot_creator -acme
1267 sk->sk_prot = sk->sk_prot_creator = prot;
1269 sock_net_set(sk, get_net(net));
1270 atomic_set(&sk->sk_wmem_alloc, 1);
1272 sock_update_classid(sk);
1273 sock_update_netprioidx(sk, current);
1278 EXPORT_SYMBOL(sk_alloc);
1280 static void __sk_free(struct sock *sk)
1282 struct sk_filter *filter;
1284 if (sk->sk_destruct)
1285 sk->sk_destruct(sk);
1287 filter = rcu_dereference_check(sk->sk_filter,
1288 atomic_read(&sk->sk_wmem_alloc) == 0);
1290 sk_filter_uncharge(sk, filter);
1291 RCU_INIT_POINTER(sk->sk_filter, NULL);
1294 sock_disable_timestamp(sk, SK_FLAGS_TIMESTAMP);
1296 if (atomic_read(&sk->sk_omem_alloc))
1297 pr_debug("%s: optmem leakage (%d bytes) detected\n",
1298 __func__, atomic_read(&sk->sk_omem_alloc));
1300 if (sk->sk_peer_cred)
1301 put_cred(sk->sk_peer_cred);
1302 put_pid(sk->sk_peer_pid);
1303 put_net(sock_net(sk));
1304 sk_prot_free(sk->sk_prot_creator, sk);
1307 void sk_free(struct sock *sk)
1310 * We subtract one from sk_wmem_alloc and can know if
1311 * some packets are still in some tx queue.
1312 * If not null, sock_wfree() will call __sk_free(sk) later
1314 if (atomic_dec_and_test(&sk->sk_wmem_alloc))
1317 EXPORT_SYMBOL(sk_free);
1320 * Last sock_put should drop reference to sk->sk_net. It has already
1321 * been dropped in sk_change_net. Taking reference to stopping namespace
1323 * Take reference to a socket to remove it from hash _alive_ and after that
1324 * destroy it in the context of init_net.
1326 void sk_release_kernel(struct sock *sk)
1328 if (sk == NULL || sk->sk_socket == NULL)
1332 sock_release(sk->sk_socket);
1333 release_net(sock_net(sk));
1334 sock_net_set(sk, get_net(&init_net));
1337 EXPORT_SYMBOL(sk_release_kernel);
1339 static void sk_update_clone(const struct sock *sk, struct sock *newsk)
1341 if (mem_cgroup_sockets_enabled && sk->sk_cgrp)
1342 sock_update_memcg(newsk);
1346 * sk_clone_lock - clone a socket, and lock its clone
1347 * @sk: the socket to clone
1348 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
1350 * Caller must unlock socket even in error path (bh_unlock_sock(newsk))
1352 struct sock *sk_clone_lock(const struct sock *sk, const gfp_t priority)
1356 newsk = sk_prot_alloc(sk->sk_prot, priority, sk->sk_family);
1357 if (newsk != NULL) {
1358 struct sk_filter *filter;
1360 sock_copy(newsk, sk);
1363 get_net(sock_net(newsk));
1364 sk_node_init(&newsk->sk_node);
1365 sock_lock_init(newsk);
1366 bh_lock_sock(newsk);
1367 newsk->sk_backlog.head = newsk->sk_backlog.tail = NULL;
1368 newsk->sk_backlog.len = 0;
1370 atomic_set(&newsk->sk_rmem_alloc, 0);
1372 * sk_wmem_alloc set to one (see sk_free() and sock_wfree())
1374 atomic_set(&newsk->sk_wmem_alloc, 1);
1375 atomic_set(&newsk->sk_omem_alloc, 0);
1376 skb_queue_head_init(&newsk->sk_receive_queue);
1377 skb_queue_head_init(&newsk->sk_write_queue);
1378 #ifdef CONFIG_NET_DMA
1379 skb_queue_head_init(&newsk->sk_async_wait_queue);
1382 spin_lock_init(&newsk->sk_dst_lock);
1383 rwlock_init(&newsk->sk_callback_lock);
1384 lockdep_set_class_and_name(&newsk->sk_callback_lock,
1385 af_callback_keys + newsk->sk_family,
1386 af_family_clock_key_strings[newsk->sk_family]);
1388 newsk->sk_dst_cache = NULL;
1389 newsk->sk_wmem_queued = 0;
1390 newsk->sk_forward_alloc = 0;
1391 newsk->sk_send_head = NULL;
1392 newsk->sk_userlocks = sk->sk_userlocks & ~SOCK_BINDPORT_LOCK;
1394 sock_reset_flag(newsk, SOCK_DONE);
1395 skb_queue_head_init(&newsk->sk_error_queue);
1397 filter = rcu_dereference_protected(newsk->sk_filter, 1);
1399 sk_filter_charge(newsk, filter);
1401 if (unlikely(xfrm_sk_clone_policy(newsk))) {
1402 /* It is still raw copy of parent, so invalidate
1403 * destructor and make plain sk_free() */
1404 newsk->sk_destruct = NULL;
1405 bh_unlock_sock(newsk);
1412 newsk->sk_priority = 0;
1414 * Before updating sk_refcnt, we must commit prior changes to memory
1415 * (Documentation/RCU/rculist_nulls.txt for details)
1418 atomic_set(&newsk->sk_refcnt, 2);
1421 * Increment the counter in the same struct proto as the master
1422 * sock (sk_refcnt_debug_inc uses newsk->sk_prot->socks, that
1423 * is the same as sk->sk_prot->socks, as this field was copied
1426 * This _changes_ the previous behaviour, where
1427 * tcp_create_openreq_child always was incrementing the
1428 * equivalent to tcp_prot->socks (inet_sock_nr), so this have
1429 * to be taken into account in all callers. -acme
1431 sk_refcnt_debug_inc(newsk);
1432 sk_set_socket(newsk, NULL);
1433 newsk->sk_wq = NULL;
1435 sk_update_clone(sk, newsk);
1437 if (newsk->sk_prot->sockets_allocated)
1438 sk_sockets_allocated_inc(newsk);
1440 if (newsk->sk_flags & SK_FLAGS_TIMESTAMP)
1441 net_enable_timestamp();
1446 EXPORT_SYMBOL_GPL(sk_clone_lock);
1448 void sk_setup_caps(struct sock *sk, struct dst_entry *dst)
1450 __sk_dst_set(sk, dst);
1451 sk->sk_route_caps = dst->dev->features;
1452 if (sk->sk_route_caps & NETIF_F_GSO)
1453 sk->sk_route_caps |= NETIF_F_GSO_SOFTWARE;
1454 sk->sk_route_caps &= ~sk->sk_route_nocaps;
1455 if (sk_can_gso(sk)) {
1456 if (dst->header_len) {
1457 sk->sk_route_caps &= ~NETIF_F_GSO_MASK;
1459 sk->sk_route_caps |= NETIF_F_SG | NETIF_F_HW_CSUM;
1460 sk->sk_gso_max_size = dst->dev->gso_max_size;
1464 EXPORT_SYMBOL_GPL(sk_setup_caps);
1466 void __init sk_init(void)
1468 if (totalram_pages <= 4096) {
1469 sysctl_wmem_max = 32767;
1470 sysctl_rmem_max = 32767;
1471 sysctl_wmem_default = 32767;
1472 sysctl_rmem_default = 32767;
1473 } else if (totalram_pages >= 131072) {
1474 sysctl_wmem_max = 131071;
1475 sysctl_rmem_max = 131071;
1480 * Simple resource managers for sockets.
1485 * Write buffer destructor automatically called from kfree_skb.
1487 void sock_wfree(struct sk_buff *skb)
1489 struct sock *sk = skb->sk;
1490 unsigned int len = skb->truesize;
1492 if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE)) {
1494 * Keep a reference on sk_wmem_alloc, this will be released
1495 * after sk_write_space() call
1497 atomic_sub(len - 1, &sk->sk_wmem_alloc);
1498 sk->sk_write_space(sk);
1502 * if sk_wmem_alloc reaches 0, we must finish what sk_free()
1503 * could not do because of in-flight packets
1505 if (atomic_sub_and_test(len, &sk->sk_wmem_alloc))
1508 EXPORT_SYMBOL(sock_wfree);
1511 * Read buffer destructor automatically called from kfree_skb.
1513 void sock_rfree(struct sk_buff *skb)
1515 struct sock *sk = skb->sk;
1516 unsigned int len = skb->truesize;
1518 atomic_sub(len, &sk->sk_rmem_alloc);
1519 sk_mem_uncharge(sk, len);
1521 EXPORT_SYMBOL(sock_rfree);
1523 void sock_edemux(struct sk_buff *skb)
1527 EXPORT_SYMBOL(sock_edemux);
1529 int sock_i_uid(struct sock *sk)
1533 read_lock_bh(&sk->sk_callback_lock);
1534 uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : 0;
1535 read_unlock_bh(&sk->sk_callback_lock);
1538 EXPORT_SYMBOL(sock_i_uid);
1540 unsigned long sock_i_ino(struct sock *sk)
1544 read_lock_bh(&sk->sk_callback_lock);
1545 ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0;
1546 read_unlock_bh(&sk->sk_callback_lock);
1549 EXPORT_SYMBOL(sock_i_ino);
1552 * Allocate a skb from the socket's send buffer.
1554 struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force,
1557 if (force || atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
1558 struct sk_buff *skb = alloc_skb(size, priority);
1560 skb_set_owner_w(skb, sk);
1566 EXPORT_SYMBOL(sock_wmalloc);
1569 * Allocate a skb from the socket's receive buffer.
1571 struct sk_buff *sock_rmalloc(struct sock *sk, unsigned long size, int force,
1574 if (force || atomic_read(&sk->sk_rmem_alloc) < sk->sk_rcvbuf) {
1575 struct sk_buff *skb = alloc_skb(size, priority);
1577 skb_set_owner_r(skb, sk);
1585 * Allocate a memory block from the socket's option memory buffer.
1587 void *sock_kmalloc(struct sock *sk, int size, gfp_t priority)
1589 if ((unsigned int)size <= sysctl_optmem_max &&
1590 atomic_read(&sk->sk_omem_alloc) + size < sysctl_optmem_max) {
1592 /* First do the add, to avoid the race if kmalloc
1595 atomic_add(size, &sk->sk_omem_alloc);
1596 mem = kmalloc(size, priority);
1599 atomic_sub(size, &sk->sk_omem_alloc);
1603 EXPORT_SYMBOL(sock_kmalloc);
1606 * Free an option memory block.
1608 void sock_kfree_s(struct sock *sk, void *mem, int size)
1611 atomic_sub(size, &sk->sk_omem_alloc);
1613 EXPORT_SYMBOL(sock_kfree_s);
1615 /* It is almost wait_for_tcp_memory minus release_sock/lock_sock.
1616 I think, these locks should be removed for datagram sockets.
1618 static long sock_wait_for_wmem(struct sock *sk, long timeo)
1622 clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1626 if (signal_pending(current))
1628 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1629 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1630 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf)
1632 if (sk->sk_shutdown & SEND_SHUTDOWN)
1636 timeo = schedule_timeout(timeo);
1638 finish_wait(sk_sleep(sk), &wait);
1644 * Generic send/receive buffer handlers
1647 struct sk_buff *sock_alloc_send_pskb(struct sock *sk, unsigned long header_len,
1648 unsigned long data_len, int noblock,
1651 struct sk_buff *skb;
1655 int npages = (data_len + (PAGE_SIZE - 1)) >> PAGE_SHIFT;
1658 if (npages > MAX_SKB_FRAGS)
1661 gfp_mask = sk->sk_allocation;
1662 if (gfp_mask & __GFP_WAIT)
1663 gfp_mask |= __GFP_REPEAT;
1665 timeo = sock_sndtimeo(sk, noblock);
1667 err = sock_error(sk);
1672 if (sk->sk_shutdown & SEND_SHUTDOWN)
1675 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
1676 skb = alloc_skb(header_len, gfp_mask);
1680 /* No pages, we're done... */
1684 skb->truesize += data_len;
1685 skb_shinfo(skb)->nr_frags = npages;
1686 for (i = 0; i < npages; i++) {
1689 page = alloc_pages(sk->sk_allocation, 0);
1692 skb_shinfo(skb)->nr_frags = i;
1697 __skb_fill_page_desc(skb, i,
1699 (data_len >= PAGE_SIZE ?
1702 data_len -= PAGE_SIZE;
1705 /* Full success... */
1711 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1712 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1716 if (signal_pending(current))
1718 timeo = sock_wait_for_wmem(sk, timeo);
1721 skb_set_owner_w(skb, sk);
1725 err = sock_intr_errno(timeo);
1730 EXPORT_SYMBOL(sock_alloc_send_pskb);
1732 struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size,
1733 int noblock, int *errcode)
1735 return sock_alloc_send_pskb(sk, size, 0, noblock, errcode);
1737 EXPORT_SYMBOL(sock_alloc_send_skb);
1739 static void __lock_sock(struct sock *sk)
1740 __releases(&sk->sk_lock.slock)
1741 __acquires(&sk->sk_lock.slock)
1746 prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait,
1747 TASK_UNINTERRUPTIBLE);
1748 spin_unlock_bh(&sk->sk_lock.slock);
1750 spin_lock_bh(&sk->sk_lock.slock);
1751 if (!sock_owned_by_user(sk))
1754 finish_wait(&sk->sk_lock.wq, &wait);
1757 static void __release_sock(struct sock *sk)
1758 __releases(&sk->sk_lock.slock)
1759 __acquires(&sk->sk_lock.slock)
1761 struct sk_buff *skb = sk->sk_backlog.head;
1764 sk->sk_backlog.head = sk->sk_backlog.tail = NULL;
1768 struct sk_buff *next = skb->next;
1771 WARN_ON_ONCE(skb_dst_is_noref(skb));
1773 sk_backlog_rcv(sk, skb);
1776 * We are in process context here with softirqs
1777 * disabled, use cond_resched_softirq() to preempt.
1778 * This is safe to do because we've taken the backlog
1781 cond_resched_softirq();
1784 } while (skb != NULL);
1787 } while ((skb = sk->sk_backlog.head) != NULL);
1790 * Doing the zeroing here guarantee we can not loop forever
1791 * while a wild producer attempts to flood us.
1793 sk->sk_backlog.len = 0;
1797 * sk_wait_data - wait for data to arrive at sk_receive_queue
1798 * @sk: sock to wait on
1799 * @timeo: for how long
1801 * Now socket state including sk->sk_err is changed only under lock,
1802 * hence we may omit checks after joining wait queue.
1803 * We check receive queue before schedule() only as optimization;
1804 * it is very likely that release_sock() added new data.
1806 int sk_wait_data(struct sock *sk, long *timeo)
1811 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1812 set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
1813 rc = sk_wait_event(sk, timeo, !skb_queue_empty(&sk->sk_receive_queue));
1814 clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
1815 finish_wait(sk_sleep(sk), &wait);
1818 EXPORT_SYMBOL(sk_wait_data);
1821 * __sk_mem_schedule - increase sk_forward_alloc and memory_allocated
1823 * @size: memory size to allocate
1824 * @kind: allocation type
1826 * If kind is SK_MEM_SEND, it means wmem allocation. Otherwise it means
1827 * rmem allocation. This function assumes that protocols which have
1828 * memory_pressure use sk_wmem_queued as write buffer accounting.
1830 int __sk_mem_schedule(struct sock *sk, int size, int kind)
1832 struct proto *prot = sk->sk_prot;
1833 int amt = sk_mem_pages(size);
1835 int parent_status = UNDER_LIMIT;
1837 sk->sk_forward_alloc += amt * SK_MEM_QUANTUM;
1839 allocated = sk_memory_allocated_add(sk, amt, &parent_status);
1842 if (parent_status == UNDER_LIMIT &&
1843 allocated <= sk_prot_mem_limits(sk, 0)) {
1844 sk_leave_memory_pressure(sk);
1848 /* Under pressure. (we or our parents) */
1849 if ((parent_status > SOFT_LIMIT) ||
1850 allocated > sk_prot_mem_limits(sk, 1))
1851 sk_enter_memory_pressure(sk);
1853 /* Over hard limit (we or our parents) */
1854 if ((parent_status == OVER_LIMIT) ||
1855 (allocated > sk_prot_mem_limits(sk, 2)))
1856 goto suppress_allocation;
1858 /* guarantee minimum buffer size under pressure */
1859 if (kind == SK_MEM_RECV) {
1860 if (atomic_read(&sk->sk_rmem_alloc) < prot->sysctl_rmem[0])
1863 } else { /* SK_MEM_SEND */
1864 if (sk->sk_type == SOCK_STREAM) {
1865 if (sk->sk_wmem_queued < prot->sysctl_wmem[0])
1867 } else if (atomic_read(&sk->sk_wmem_alloc) <
1868 prot->sysctl_wmem[0])
1872 if (sk_has_memory_pressure(sk)) {
1875 if (!sk_under_memory_pressure(sk))
1877 alloc = sk_sockets_allocated_read_positive(sk);
1878 if (sk_prot_mem_limits(sk, 2) > alloc *
1879 sk_mem_pages(sk->sk_wmem_queued +
1880 atomic_read(&sk->sk_rmem_alloc) +
1881 sk->sk_forward_alloc))
1885 suppress_allocation:
1887 if (kind == SK_MEM_SEND && sk->sk_type == SOCK_STREAM) {
1888 sk_stream_moderate_sndbuf(sk);
1890 /* Fail only if socket is _under_ its sndbuf.
1891 * In this case we cannot block, so that we have to fail.
1893 if (sk->sk_wmem_queued + size >= sk->sk_sndbuf)
1897 trace_sock_exceed_buf_limit(sk, prot, allocated);
1899 /* Alas. Undo changes. */
1900 sk->sk_forward_alloc -= amt * SK_MEM_QUANTUM;
1902 sk_memory_allocated_sub(sk, amt);
1906 EXPORT_SYMBOL(__sk_mem_schedule);
1909 * __sk_reclaim - reclaim memory_allocated
1912 void __sk_mem_reclaim(struct sock *sk)
1914 sk_memory_allocated_sub(sk,
1915 sk->sk_forward_alloc >> SK_MEM_QUANTUM_SHIFT);
1916 sk->sk_forward_alloc &= SK_MEM_QUANTUM - 1;
1918 if (sk_under_memory_pressure(sk) &&
1919 (sk_memory_allocated(sk) < sk_prot_mem_limits(sk, 0)))
1920 sk_leave_memory_pressure(sk);
1922 EXPORT_SYMBOL(__sk_mem_reclaim);
1926 * Set of default routines for initialising struct proto_ops when
1927 * the protocol does not support a particular function. In certain
1928 * cases where it makes no sense for a protocol to have a "do nothing"
1929 * function, some default processing is provided.
1932 int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len)
1936 EXPORT_SYMBOL(sock_no_bind);
1938 int sock_no_connect(struct socket *sock, struct sockaddr *saddr,
1943 EXPORT_SYMBOL(sock_no_connect);
1945 int sock_no_socketpair(struct socket *sock1, struct socket *sock2)
1949 EXPORT_SYMBOL(sock_no_socketpair);
1951 int sock_no_accept(struct socket *sock, struct socket *newsock, int flags)
1955 EXPORT_SYMBOL(sock_no_accept);
1957 int sock_no_getname(struct socket *sock, struct sockaddr *saddr,
1962 EXPORT_SYMBOL(sock_no_getname);
1964 unsigned int sock_no_poll(struct file *file, struct socket *sock, poll_table *pt)
1968 EXPORT_SYMBOL(sock_no_poll);
1970 int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1974 EXPORT_SYMBOL(sock_no_ioctl);
1976 int sock_no_listen(struct socket *sock, int backlog)
1980 EXPORT_SYMBOL(sock_no_listen);
1982 int sock_no_shutdown(struct socket *sock, int how)
1986 EXPORT_SYMBOL(sock_no_shutdown);
1988 int sock_no_setsockopt(struct socket *sock, int level, int optname,
1989 char __user *optval, unsigned int optlen)
1993 EXPORT_SYMBOL(sock_no_setsockopt);
1995 int sock_no_getsockopt(struct socket *sock, int level, int optname,
1996 char __user *optval, int __user *optlen)
2000 EXPORT_SYMBOL(sock_no_getsockopt);
2002 int sock_no_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
2007 EXPORT_SYMBOL(sock_no_sendmsg);
2009 int sock_no_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
2010 size_t len, int flags)
2014 EXPORT_SYMBOL(sock_no_recvmsg);
2016 int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma)
2018 /* Mirror missing mmap method error code */
2021 EXPORT_SYMBOL(sock_no_mmap);
2023 ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags)
2026 struct msghdr msg = {.msg_flags = flags};
2028 char *kaddr = kmap(page);
2029 iov.iov_base = kaddr + offset;
2031 res = kernel_sendmsg(sock, &msg, &iov, 1, size);
2035 EXPORT_SYMBOL(sock_no_sendpage);
2038 * Default Socket Callbacks
2041 static void sock_def_wakeup(struct sock *sk)
2043 struct socket_wq *wq;
2046 wq = rcu_dereference(sk->sk_wq);
2047 if (wq_has_sleeper(wq))
2048 wake_up_interruptible_all(&wq->wait);
2052 static void sock_def_error_report(struct sock *sk)
2054 struct socket_wq *wq;
2057 wq = rcu_dereference(sk->sk_wq);
2058 if (wq_has_sleeper(wq))
2059 wake_up_interruptible_poll(&wq->wait, POLLERR);
2060 sk_wake_async(sk, SOCK_WAKE_IO, POLL_ERR);
2064 static void sock_def_readable(struct sock *sk, int len)
2066 struct socket_wq *wq;
2069 wq = rcu_dereference(sk->sk_wq);
2070 if (wq_has_sleeper(wq))
2071 wake_up_interruptible_sync_poll(&wq->wait, POLLIN | POLLPRI |
2072 POLLRDNORM | POLLRDBAND);
2073 sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN);
2077 static void sock_def_write_space(struct sock *sk)
2079 struct socket_wq *wq;
2083 /* Do not wake up a writer until he can make "significant"
2086 if ((atomic_read(&sk->sk_wmem_alloc) << 1) <= sk->sk_sndbuf) {
2087 wq = rcu_dereference(sk->sk_wq);
2088 if (wq_has_sleeper(wq))
2089 wake_up_interruptible_sync_poll(&wq->wait, POLLOUT |
2090 POLLWRNORM | POLLWRBAND);
2092 /* Should agree with poll, otherwise some programs break */
2093 if (sock_writeable(sk))
2094 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
2100 static void sock_def_destruct(struct sock *sk)
2102 kfree(sk->sk_protinfo);
2105 void sk_send_sigurg(struct sock *sk)
2107 if (sk->sk_socket && sk->sk_socket->file)
2108 if (send_sigurg(&sk->sk_socket->file->f_owner))
2109 sk_wake_async(sk, SOCK_WAKE_URG, POLL_PRI);
2111 EXPORT_SYMBOL(sk_send_sigurg);
2113 void sk_reset_timer(struct sock *sk, struct timer_list* timer,
2114 unsigned long expires)
2116 if (!mod_timer(timer, expires))
2119 EXPORT_SYMBOL(sk_reset_timer);
2121 void sk_stop_timer(struct sock *sk, struct timer_list* timer)
2123 if (timer_pending(timer) && del_timer(timer))
2126 EXPORT_SYMBOL(sk_stop_timer);
2128 void sock_init_data(struct socket *sock, struct sock *sk)
2130 skb_queue_head_init(&sk->sk_receive_queue);
2131 skb_queue_head_init(&sk->sk_write_queue);
2132 skb_queue_head_init(&sk->sk_error_queue);
2133 #ifdef CONFIG_NET_DMA
2134 skb_queue_head_init(&sk->sk_async_wait_queue);
2137 sk->sk_send_head = NULL;
2139 init_timer(&sk->sk_timer);
2141 sk->sk_allocation = GFP_KERNEL;
2142 sk->sk_rcvbuf = sysctl_rmem_default;
2143 sk->sk_sndbuf = sysctl_wmem_default;
2144 sk->sk_state = TCP_CLOSE;
2145 sk_set_socket(sk, sock);
2147 sock_set_flag(sk, SOCK_ZAPPED);
2150 sk->sk_type = sock->type;
2151 sk->sk_wq = sock->wq;
2156 spin_lock_init(&sk->sk_dst_lock);
2157 rwlock_init(&sk->sk_callback_lock);
2158 lockdep_set_class_and_name(&sk->sk_callback_lock,
2159 af_callback_keys + sk->sk_family,
2160 af_family_clock_key_strings[sk->sk_family]);
2162 sk->sk_state_change = sock_def_wakeup;
2163 sk->sk_data_ready = sock_def_readable;
2164 sk->sk_write_space = sock_def_write_space;
2165 sk->sk_error_report = sock_def_error_report;
2166 sk->sk_destruct = sock_def_destruct;
2168 sk->sk_sndmsg_page = NULL;
2169 sk->sk_sndmsg_off = 0;
2170 sk->sk_peek_off = -1;
2172 sk->sk_peer_pid = NULL;
2173 sk->sk_peer_cred = NULL;
2174 sk->sk_write_pending = 0;
2175 sk->sk_rcvlowat = 1;
2176 sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT;
2177 sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT;
2179 sk->sk_stamp = ktime_set(-1L, 0);
2182 * Before updating sk_refcnt, we must commit prior changes to memory
2183 * (Documentation/RCU/rculist_nulls.txt for details)
2186 atomic_set(&sk->sk_refcnt, 1);
2187 atomic_set(&sk->sk_drops, 0);
2189 EXPORT_SYMBOL(sock_init_data);
2191 void lock_sock_nested(struct sock *sk, int subclass)
2194 spin_lock_bh(&sk->sk_lock.slock);
2195 if (sk->sk_lock.owned)
2197 sk->sk_lock.owned = 1;
2198 spin_unlock(&sk->sk_lock.slock);
2200 * The sk_lock has mutex_lock() semantics here:
2202 mutex_acquire(&sk->sk_lock.dep_map, subclass, 0, _RET_IP_);
2205 EXPORT_SYMBOL(lock_sock_nested);
2207 void release_sock(struct sock *sk)
2210 * The sk_lock has mutex_unlock() semantics:
2212 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_);
2214 spin_lock_bh(&sk->sk_lock.slock);
2215 if (sk->sk_backlog.tail)
2218 if (sk->sk_prot->release_cb)
2219 sk->sk_prot->release_cb(sk);
2221 sk->sk_lock.owned = 0;
2222 if (waitqueue_active(&sk->sk_lock.wq))
2223 wake_up(&sk->sk_lock.wq);
2224 spin_unlock_bh(&sk->sk_lock.slock);
2226 EXPORT_SYMBOL(release_sock);
2229 * lock_sock_fast - fast version of lock_sock
2232 * This version should be used for very small section, where process wont block
2233 * return false if fast path is taken
2234 * sk_lock.slock locked, owned = 0, BH disabled
2235 * return true if slow path is taken
2236 * sk_lock.slock unlocked, owned = 1, BH enabled
2238 bool lock_sock_fast(struct sock *sk)
2241 spin_lock_bh(&sk->sk_lock.slock);
2243 if (!sk->sk_lock.owned)
2245 * Note : We must disable BH
2250 sk->sk_lock.owned = 1;
2251 spin_unlock(&sk->sk_lock.slock);
2253 * The sk_lock has mutex_lock() semantics here:
2255 mutex_acquire(&sk->sk_lock.dep_map, 0, 0, _RET_IP_);
2259 EXPORT_SYMBOL(lock_sock_fast);
2261 int sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp)
2264 if (!sock_flag(sk, SOCK_TIMESTAMP))
2265 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
2266 tv = ktime_to_timeval(sk->sk_stamp);
2267 if (tv.tv_sec == -1)
2269 if (tv.tv_sec == 0) {
2270 sk->sk_stamp = ktime_get_real();
2271 tv = ktime_to_timeval(sk->sk_stamp);
2273 return copy_to_user(userstamp, &tv, sizeof(tv)) ? -EFAULT : 0;
2275 EXPORT_SYMBOL(sock_get_timestamp);
2277 int sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp)
2280 if (!sock_flag(sk, SOCK_TIMESTAMP))
2281 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
2282 ts = ktime_to_timespec(sk->sk_stamp);
2283 if (ts.tv_sec == -1)
2285 if (ts.tv_sec == 0) {
2286 sk->sk_stamp = ktime_get_real();
2287 ts = ktime_to_timespec(sk->sk_stamp);
2289 return copy_to_user(userstamp, &ts, sizeof(ts)) ? -EFAULT : 0;
2291 EXPORT_SYMBOL(sock_get_timestampns);
2293 void sock_enable_timestamp(struct sock *sk, int flag)
2295 if (!sock_flag(sk, flag)) {
2296 unsigned long previous_flags = sk->sk_flags;
2298 sock_set_flag(sk, flag);
2300 * we just set one of the two flags which require net
2301 * time stamping, but time stamping might have been on
2302 * already because of the other one
2304 if (!(previous_flags & SK_FLAGS_TIMESTAMP))
2305 net_enable_timestamp();
2310 * Get a socket option on an socket.
2312 * FIX: POSIX 1003.1g is very ambiguous here. It states that
2313 * asynchronous errors should be reported by getsockopt. We assume
2314 * this means if you specify SO_ERROR (otherwise whats the point of it).
2316 int sock_common_getsockopt(struct socket *sock, int level, int optname,
2317 char __user *optval, int __user *optlen)
2319 struct sock *sk = sock->sk;
2321 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
2323 EXPORT_SYMBOL(sock_common_getsockopt);
2325 #ifdef CONFIG_COMPAT
2326 int compat_sock_common_getsockopt(struct socket *sock, int level, int optname,
2327 char __user *optval, int __user *optlen)
2329 struct sock *sk = sock->sk;
2331 if (sk->sk_prot->compat_getsockopt != NULL)
2332 return sk->sk_prot->compat_getsockopt(sk, level, optname,
2334 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
2336 EXPORT_SYMBOL(compat_sock_common_getsockopt);
2339 int sock_common_recvmsg(struct kiocb *iocb, struct socket *sock,
2340 struct msghdr *msg, size_t size, int flags)
2342 struct sock *sk = sock->sk;
2346 err = sk->sk_prot->recvmsg(iocb, sk, msg, size, flags & MSG_DONTWAIT,
2347 flags & ~MSG_DONTWAIT, &addr_len);
2349 msg->msg_namelen = addr_len;
2352 EXPORT_SYMBOL(sock_common_recvmsg);
2355 * Set socket options on an inet socket.
2357 int sock_common_setsockopt(struct socket *sock, int level, int optname,
2358 char __user *optval, unsigned int optlen)
2360 struct sock *sk = sock->sk;
2362 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
2364 EXPORT_SYMBOL(sock_common_setsockopt);
2366 #ifdef CONFIG_COMPAT
2367 int compat_sock_common_setsockopt(struct socket *sock, int level, int optname,
2368 char __user *optval, unsigned int optlen)
2370 struct sock *sk = sock->sk;
2372 if (sk->sk_prot->compat_setsockopt != NULL)
2373 return sk->sk_prot->compat_setsockopt(sk, level, optname,
2375 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
2377 EXPORT_SYMBOL(compat_sock_common_setsockopt);
2380 void sk_common_release(struct sock *sk)
2382 if (sk->sk_prot->destroy)
2383 sk->sk_prot->destroy(sk);
2386 * Observation: when sock_common_release is called, processes have
2387 * no access to socket. But net still has.
2388 * Step one, detach it from networking:
2390 * A. Remove from hash tables.
2393 sk->sk_prot->unhash(sk);
2396 * In this point socket cannot receive new packets, but it is possible
2397 * that some packets are in flight because some CPU runs receiver and
2398 * did hash table lookup before we unhashed socket. They will achieve
2399 * receive queue and will be purged by socket destructor.
2401 * Also we still have packets pending on receive queue and probably,
2402 * our own packets waiting in device queues. sock_destroy will drain
2403 * receive queue, but transmitted packets will delay socket destruction
2404 * until the last reference will be released.
2409 xfrm_sk_free_policy(sk);
2411 sk_refcnt_debug_release(sk);
2414 EXPORT_SYMBOL(sk_common_release);
2416 #ifdef CONFIG_PROC_FS
2417 #define PROTO_INUSE_NR 64 /* should be enough for the first time */
2419 int val[PROTO_INUSE_NR];
2422 static DECLARE_BITMAP(proto_inuse_idx, PROTO_INUSE_NR);
2424 #ifdef CONFIG_NET_NS
2425 void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
2427 __this_cpu_add(net->core.inuse->val[prot->inuse_idx], val);
2429 EXPORT_SYMBOL_GPL(sock_prot_inuse_add);
2431 int sock_prot_inuse_get(struct net *net, struct proto *prot)
2433 int cpu, idx = prot->inuse_idx;
2436 for_each_possible_cpu(cpu)
2437 res += per_cpu_ptr(net->core.inuse, cpu)->val[idx];
2439 return res >= 0 ? res : 0;
2441 EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
2443 static int __net_init sock_inuse_init_net(struct net *net)
2445 net->core.inuse = alloc_percpu(struct prot_inuse);
2446 return net->core.inuse ? 0 : -ENOMEM;
2449 static void __net_exit sock_inuse_exit_net(struct net *net)
2451 free_percpu(net->core.inuse);
2454 static struct pernet_operations net_inuse_ops = {
2455 .init = sock_inuse_init_net,
2456 .exit = sock_inuse_exit_net,
2459 static __init int net_inuse_init(void)
2461 if (register_pernet_subsys(&net_inuse_ops))
2462 panic("Cannot initialize net inuse counters");
2467 core_initcall(net_inuse_init);
2469 static DEFINE_PER_CPU(struct prot_inuse, prot_inuse);
2471 void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
2473 __this_cpu_add(prot_inuse.val[prot->inuse_idx], val);
2475 EXPORT_SYMBOL_GPL(sock_prot_inuse_add);
2477 int sock_prot_inuse_get(struct net *net, struct proto *prot)
2479 int cpu, idx = prot->inuse_idx;
2482 for_each_possible_cpu(cpu)
2483 res += per_cpu(prot_inuse, cpu).val[idx];
2485 return res >= 0 ? res : 0;
2487 EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
2490 static void assign_proto_idx(struct proto *prot)
2492 prot->inuse_idx = find_first_zero_bit(proto_inuse_idx, PROTO_INUSE_NR);
2494 if (unlikely(prot->inuse_idx == PROTO_INUSE_NR - 1)) {
2495 pr_err("PROTO_INUSE_NR exhausted\n");
2499 set_bit(prot->inuse_idx, proto_inuse_idx);
2502 static void release_proto_idx(struct proto *prot)
2504 if (prot->inuse_idx != PROTO_INUSE_NR - 1)
2505 clear_bit(prot->inuse_idx, proto_inuse_idx);
2508 static inline void assign_proto_idx(struct proto *prot)
2512 static inline void release_proto_idx(struct proto *prot)
2517 int proto_register(struct proto *prot, int alloc_slab)
2520 prot->slab = kmem_cache_create(prot->name, prot->obj_size, 0,
2521 SLAB_HWCACHE_ALIGN | prot->slab_flags,
2524 if (prot->slab == NULL) {
2525 pr_crit("%s: Can't create sock SLAB cache!\n",
2530 if (prot->rsk_prot != NULL) {
2531 prot->rsk_prot->slab_name = kasprintf(GFP_KERNEL, "request_sock_%s", prot->name);
2532 if (prot->rsk_prot->slab_name == NULL)
2533 goto out_free_sock_slab;
2535 prot->rsk_prot->slab = kmem_cache_create(prot->rsk_prot->slab_name,
2536 prot->rsk_prot->obj_size, 0,
2537 SLAB_HWCACHE_ALIGN, NULL);
2539 if (prot->rsk_prot->slab == NULL) {
2540 pr_crit("%s: Can't create request sock SLAB cache!\n",
2542 goto out_free_request_sock_slab_name;
2546 if (prot->twsk_prot != NULL) {
2547 prot->twsk_prot->twsk_slab_name = kasprintf(GFP_KERNEL, "tw_sock_%s", prot->name);
2549 if (prot->twsk_prot->twsk_slab_name == NULL)
2550 goto out_free_request_sock_slab;
2552 prot->twsk_prot->twsk_slab =
2553 kmem_cache_create(prot->twsk_prot->twsk_slab_name,
2554 prot->twsk_prot->twsk_obj_size,
2556 SLAB_HWCACHE_ALIGN |
2559 if (prot->twsk_prot->twsk_slab == NULL)
2560 goto out_free_timewait_sock_slab_name;
2564 mutex_lock(&proto_list_mutex);
2565 list_add(&prot->node, &proto_list);
2566 assign_proto_idx(prot);
2567 mutex_unlock(&proto_list_mutex);
2570 out_free_timewait_sock_slab_name:
2571 kfree(prot->twsk_prot->twsk_slab_name);
2572 out_free_request_sock_slab:
2573 if (prot->rsk_prot && prot->rsk_prot->slab) {
2574 kmem_cache_destroy(prot->rsk_prot->slab);
2575 prot->rsk_prot->slab = NULL;
2577 out_free_request_sock_slab_name:
2579 kfree(prot->rsk_prot->slab_name);
2581 kmem_cache_destroy(prot->slab);
2586 EXPORT_SYMBOL(proto_register);
2588 void proto_unregister(struct proto *prot)
2590 mutex_lock(&proto_list_mutex);
2591 release_proto_idx(prot);
2592 list_del(&prot->node);
2593 mutex_unlock(&proto_list_mutex);
2595 if (prot->slab != NULL) {
2596 kmem_cache_destroy(prot->slab);
2600 if (prot->rsk_prot != NULL && prot->rsk_prot->slab != NULL) {
2601 kmem_cache_destroy(prot->rsk_prot->slab);
2602 kfree(prot->rsk_prot->slab_name);
2603 prot->rsk_prot->slab = NULL;
2606 if (prot->twsk_prot != NULL && prot->twsk_prot->twsk_slab != NULL) {
2607 kmem_cache_destroy(prot->twsk_prot->twsk_slab);
2608 kfree(prot->twsk_prot->twsk_slab_name);
2609 prot->twsk_prot->twsk_slab = NULL;
2612 EXPORT_SYMBOL(proto_unregister);
2614 #ifdef CONFIG_PROC_FS
2615 static void *proto_seq_start(struct seq_file *seq, loff_t *pos)
2616 __acquires(proto_list_mutex)
2618 mutex_lock(&proto_list_mutex);
2619 return seq_list_start_head(&proto_list, *pos);
2622 static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2624 return seq_list_next(v, &proto_list, pos);
2627 static void proto_seq_stop(struct seq_file *seq, void *v)
2628 __releases(proto_list_mutex)
2630 mutex_unlock(&proto_list_mutex);
2633 static char proto_method_implemented(const void *method)
2635 return method == NULL ? 'n' : 'y';
2637 static long sock_prot_memory_allocated(struct proto *proto)
2639 return proto->memory_allocated != NULL ? proto_memory_allocated(proto) : -1L;
2642 static char *sock_prot_memory_pressure(struct proto *proto)
2644 return proto->memory_pressure != NULL ?
2645 proto_memory_pressure(proto) ? "yes" : "no" : "NI";
2648 static void proto_seq_printf(struct seq_file *seq, struct proto *proto)
2651 seq_printf(seq, "%-9s %4u %6d %6ld %-3s %6u %-3s %-10s "
2652 "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n",
2655 sock_prot_inuse_get(seq_file_net(seq), proto),
2656 sock_prot_memory_allocated(proto),
2657 sock_prot_memory_pressure(proto),
2659 proto->slab == NULL ? "no" : "yes",
2660 module_name(proto->owner),
2661 proto_method_implemented(proto->close),
2662 proto_method_implemented(proto->connect),
2663 proto_method_implemented(proto->disconnect),
2664 proto_method_implemented(proto->accept),
2665 proto_method_implemented(proto->ioctl),
2666 proto_method_implemented(proto->init),
2667 proto_method_implemented(proto->destroy),
2668 proto_method_implemented(proto->shutdown),
2669 proto_method_implemented(proto->setsockopt),
2670 proto_method_implemented(proto->getsockopt),
2671 proto_method_implemented(proto->sendmsg),
2672 proto_method_implemented(proto->recvmsg),
2673 proto_method_implemented(proto->sendpage),
2674 proto_method_implemented(proto->bind),
2675 proto_method_implemented(proto->backlog_rcv),
2676 proto_method_implemented(proto->hash),
2677 proto_method_implemented(proto->unhash),
2678 proto_method_implemented(proto->get_port),
2679 proto_method_implemented(proto->enter_memory_pressure));
2682 static int proto_seq_show(struct seq_file *seq, void *v)
2684 if (v == &proto_list)
2685 seq_printf(seq, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s",
2694 "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n");
2696 proto_seq_printf(seq, list_entry(v, struct proto, node));
2700 static const struct seq_operations proto_seq_ops = {
2701 .start = proto_seq_start,
2702 .next = proto_seq_next,
2703 .stop = proto_seq_stop,
2704 .show = proto_seq_show,
2707 static int proto_seq_open(struct inode *inode, struct file *file)
2709 return seq_open_net(inode, file, &proto_seq_ops,
2710 sizeof(struct seq_net_private));
2713 static const struct file_operations proto_seq_fops = {
2714 .owner = THIS_MODULE,
2715 .open = proto_seq_open,
2717 .llseek = seq_lseek,
2718 .release = seq_release_net,
2721 static __net_init int proto_init_net(struct net *net)
2723 if (!proc_net_fops_create(net, "protocols", S_IRUGO, &proto_seq_fops))
2729 static __net_exit void proto_exit_net(struct net *net)
2731 proc_net_remove(net, "protocols");
2735 static __net_initdata struct pernet_operations proto_net_ops = {
2736 .init = proto_init_net,
2737 .exit = proto_exit_net,
2740 static int __init proto_init(void)
2742 return register_pernet_subsys(&proto_net_ops);
2745 subsys_initcall(proto_init);
2747 #endif /* PROC_FS */