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.
10 * Version: $Id: sock.c,v 1.117 2002/02/01 22:01:03 davem Exp $
13 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
14 * Florian La Roche, <flla@stud.uni-sb.de>
15 * Alan Cox, <A.Cox@swansea.ac.uk>
18 * Alan Cox : Numerous verify_area() problems
19 * Alan Cox : Connecting on a connecting socket
20 * now returns an error for tcp.
21 * Alan Cox : sock->protocol is set correctly.
22 * and is not sometimes left as 0.
23 * Alan Cox : connect handles icmp errors on a
24 * connect properly. Unfortunately there
25 * is a restart syscall nasty there. I
26 * can't match BSD without hacking the C
27 * library. Ideas urgently sought!
28 * Alan Cox : Disallow bind() to addresses that are
29 * not ours - especially broadcast ones!!
30 * Alan Cox : Socket 1024 _IS_ ok for users. (fencepost)
31 * Alan Cox : sock_wfree/sock_rfree don't destroy sockets,
32 * instead they leave that for the DESTROY timer.
33 * Alan Cox : Clean up error flag in accept
34 * Alan Cox : TCP ack handling is buggy, the DESTROY timer
35 * was buggy. Put a remove_sock() in the handler
36 * for memory when we hit 0. Also altered the timer
37 * code. The ACK stuff can wait and needs major
39 * Alan Cox : Fixed TCP ack bug, removed remove sock
40 * and fixed timer/inet_bh race.
41 * Alan Cox : Added zapped flag for TCP
42 * Alan Cox : Move kfree_skb into skbuff.c and tidied up surplus code
43 * Alan Cox : for new sk_buff allocations wmalloc/rmalloc now call alloc_skb
44 * Alan Cox : kfree_s calls now are kfree_skbmem so we can track skb resources
45 * Alan Cox : Supports socket option broadcast now as does udp. Packet and raw need fixing.
46 * Alan Cox : Added RCVBUF,SNDBUF size setting. It suddenly occurred to me how easy it was so...
47 * Rick Sladkey : Relaxed UDP rules for matching packets.
48 * C.E.Hawkins : IFF_PROMISC/SIOCGHWADDR support
49 * Pauline Middelink : identd support
50 * Alan Cox : Fixed connect() taking signals I think.
51 * Alan Cox : SO_LINGER supported
52 * Alan Cox : Error reporting fixes
53 * Anonymous : inet_create tidied up (sk->reuse setting)
54 * Alan Cox : inet sockets don't set sk->type!
55 * Alan Cox : Split socket option code
56 * Alan Cox : Callbacks
57 * Alan Cox : Nagle flag for Charles & Johannes stuff
58 * Alex : Removed restriction on inet fioctl
59 * Alan Cox : Splitting INET from NET core
60 * Alan Cox : Fixed bogus SO_TYPE handling in getsockopt()
61 * Adam Caldwell : Missing return in SO_DONTROUTE/SO_DEBUG code
62 * Alan Cox : Split IP from generic code
63 * Alan Cox : New kfree_skbmem()
64 * Alan Cox : Make SO_DEBUG superuser only.
65 * Alan Cox : Allow anyone to clear SO_DEBUG
67 * Alan Cox : Added optimistic memory grabbing for AF_UNIX throughput.
68 * Alan Cox : Allocator for a socket is settable.
69 * Alan Cox : SO_ERROR includes soft errors.
70 * Alan Cox : Allow NULL arguments on some SO_ opts
71 * Alan Cox : Generic socket allocation to make hooks
72 * easier (suggested by Craig Metz).
73 * Michael Pall : SO_ERROR returns positive errno again
74 * Steve Whitehouse: Added default destructor to free
75 * protocol private data.
76 * Steve Whitehouse: Added various other default routines
77 * common to several socket families.
78 * Chris Evans : Call suser() check last on F_SETOWN
79 * Jay Schulist : Added SO_ATTACH_FILTER and SO_DETACH_FILTER.
80 * Andi Kleen : Add sock_kmalloc()/sock_kfree_s()
81 * Andi Kleen : Fix write_space callback
82 * Chris Evans : Security fixes - signedness again
83 * Arnaldo C. Melo : cleanups, use skb_queue_purge
88 * This program is free software; you can redistribute it and/or
89 * modify it under the terms of the GNU General Public License
90 * as published by the Free Software Foundation; either version
91 * 2 of the License, or (at your option) any later version.
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>
116 #include <asm/uaccess.h>
117 #include <asm/system.h>
119 #include <linux/netdevice.h>
120 #include <net/protocol.h>
121 #include <linux/skbuff.h>
122 #include <net/request_sock.h>
123 #include <net/sock.h>
124 #include <net/xfrm.h>
125 #include <linux/ipsec.h>
127 #include <linux/filter.h>
134 * Each address family might have different locking rules, so we have
135 * one slock key per address family:
137 static struct lock_class_key af_family_keys[AF_MAX];
138 static struct lock_class_key af_family_slock_keys[AF_MAX];
140 #ifdef CONFIG_DEBUG_LOCK_ALLOC
142 * Make lock validator output more readable. (we pre-construct these
143 * strings build-time, so that runtime initialization of socket
146 static const char *af_family_key_strings[AF_MAX+1] = {
147 "sk_lock-AF_UNSPEC", "sk_lock-AF_UNIX" , "sk_lock-AF_INET" ,
148 "sk_lock-AF_AX25" , "sk_lock-AF_IPX" , "sk_lock-AF_APPLETALK",
149 "sk_lock-AF_NETROM", "sk_lock-AF_BRIDGE" , "sk_lock-AF_ATMPVC" ,
150 "sk_lock-AF_X25" , "sk_lock-AF_INET6" , "sk_lock-AF_ROSE" ,
151 "sk_lock-AF_DECnet", "sk_lock-AF_NETBEUI" , "sk_lock-AF_SECURITY" ,
152 "sk_lock-AF_KEY" , "sk_lock-AF_NETLINK" , "sk_lock-AF_PACKET" ,
153 "sk_lock-AF_ASH" , "sk_lock-AF_ECONET" , "sk_lock-AF_ATMSVC" ,
154 "sk_lock-21" , "sk_lock-AF_SNA" , "sk_lock-AF_IRDA" ,
155 "sk_lock-AF_PPPOX" , "sk_lock-AF_WANPIPE" , "sk_lock-AF_LLC" ,
156 "sk_lock-27" , "sk_lock-28" , "sk_lock-29" ,
157 "sk_lock-AF_TIPC" , "sk_lock-AF_BLUETOOTH", "sk_lock-IUCV" ,
158 "sk_lock-AF_RXRPC" , "sk_lock-AF_MAX"
160 static const char *af_family_slock_key_strings[AF_MAX+1] = {
161 "slock-AF_UNSPEC", "slock-AF_UNIX" , "slock-AF_INET" ,
162 "slock-AF_AX25" , "slock-AF_IPX" , "slock-AF_APPLETALK",
163 "slock-AF_NETROM", "slock-AF_BRIDGE" , "slock-AF_ATMPVC" ,
164 "slock-AF_X25" , "slock-AF_INET6" , "slock-AF_ROSE" ,
165 "slock-AF_DECnet", "slock-AF_NETBEUI" , "slock-AF_SECURITY" ,
166 "slock-AF_KEY" , "slock-AF_NETLINK" , "slock-AF_PACKET" ,
167 "slock-AF_ASH" , "slock-AF_ECONET" , "slock-AF_ATMSVC" ,
168 "slock-21" , "slock-AF_SNA" , "slock-AF_IRDA" ,
169 "slock-AF_PPPOX" , "slock-AF_WANPIPE" , "slock-AF_LLC" ,
170 "slock-27" , "slock-28" , "slock-29" ,
171 "slock-AF_TIPC" , "slock-AF_BLUETOOTH", "slock-AF_IUCV" ,
172 "slock-AF_RXRPC" , "slock-AF_MAX"
174 static const char *af_family_clock_key_strings[AF_MAX+1] = {
175 "clock-AF_UNSPEC", "clock-AF_UNIX" , "clock-AF_INET" ,
176 "clock-AF_AX25" , "clock-AF_IPX" , "clock-AF_APPLETALK",
177 "clock-AF_NETROM", "clock-AF_BRIDGE" , "clock-AF_ATMPVC" ,
178 "clock-AF_X25" , "clock-AF_INET6" , "clock-AF_ROSE" ,
179 "clock-AF_DECnet", "clock-AF_NETBEUI" , "clock-AF_SECURITY" ,
180 "clock-AF_KEY" , "clock-AF_NETLINK" , "clock-AF_PACKET" ,
181 "clock-AF_ASH" , "clock-AF_ECONET" , "clock-AF_ATMSVC" ,
182 "clock-21" , "clock-AF_SNA" , "clock-AF_IRDA" ,
183 "clock-AF_PPPOX" , "clock-AF_WANPIPE" , "clock-AF_LLC" ,
184 "clock-27" , "clock-28" , "clock-29" ,
185 "clock-AF_TIPC" , "clock-AF_BLUETOOTH", "clock-AF_IUCV" ,
186 "clock-AF_RXRPC" , "clock-AF_MAX"
191 * sk_callback_lock locking rules are per-address-family,
192 * so split the lock classes by using a per-AF key:
194 static struct lock_class_key af_callback_keys[AF_MAX];
196 /* Take into consideration the size of the struct sk_buff overhead in the
197 * determination of these values, since that is non-constant across
198 * platforms. This makes socket queueing behavior and performance
199 * not depend upon such differences.
201 #define _SK_MEM_PACKETS 256
202 #define _SK_MEM_OVERHEAD (sizeof(struct sk_buff) + 256)
203 #define SK_WMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS)
204 #define SK_RMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS)
206 /* Run time adjustable parameters. */
207 __u32 sysctl_wmem_max __read_mostly = SK_WMEM_MAX;
208 __u32 sysctl_rmem_max __read_mostly = SK_RMEM_MAX;
209 __u32 sysctl_wmem_default __read_mostly = SK_WMEM_MAX;
210 __u32 sysctl_rmem_default __read_mostly = SK_RMEM_MAX;
212 /* Maximal space eaten by iovec or ancilliary data plus some space */
213 int sysctl_optmem_max __read_mostly = sizeof(unsigned long)*(2*UIO_MAXIOV+512);
215 static int sock_set_timeout(long *timeo_p, char __user *optval, int optlen)
219 if (optlen < sizeof(tv))
221 if (copy_from_user(&tv, optval, sizeof(tv)))
223 if (tv.tv_usec < 0 || tv.tv_usec >= USEC_PER_SEC)
227 static int warned __read_mostly;
230 if (warned < 10 && net_ratelimit())
232 printk(KERN_INFO "sock_set_timeout: `%s' (pid %d) "
233 "tries to set negative timeout\n",
234 current->comm, current->pid);
237 *timeo_p = MAX_SCHEDULE_TIMEOUT;
238 if (tv.tv_sec == 0 && tv.tv_usec == 0)
240 if (tv.tv_sec < (MAX_SCHEDULE_TIMEOUT/HZ - 1))
241 *timeo_p = tv.tv_sec*HZ + (tv.tv_usec+(1000000/HZ-1))/(1000000/HZ);
245 static void sock_warn_obsolete_bsdism(const char *name)
248 static char warncomm[TASK_COMM_LEN];
249 if (strcmp(warncomm, current->comm) && warned < 5) {
250 strcpy(warncomm, current->comm);
251 printk(KERN_WARNING "process `%s' is using obsolete "
252 "%s SO_BSDCOMPAT\n", warncomm, name);
257 static void sock_disable_timestamp(struct sock *sk)
259 if (sock_flag(sk, SOCK_TIMESTAMP)) {
260 sock_reset_flag(sk, SOCK_TIMESTAMP);
261 net_disable_timestamp();
266 int sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
271 /* Cast skb->rcvbuf to unsigned... It's pointless, but reduces
272 number of warnings when compiling with -W --ANK
274 if (atomic_read(&sk->sk_rmem_alloc) + skb->truesize >=
275 (unsigned)sk->sk_rcvbuf) {
280 err = sk_filter(sk, skb);
285 skb_set_owner_r(skb, sk);
287 /* Cache the SKB length before we tack it onto the receive
288 * queue. Once it is added it no longer belongs to us and
289 * may be freed by other threads of control pulling packets
294 skb_queue_tail(&sk->sk_receive_queue, skb);
296 if (!sock_flag(sk, SOCK_DEAD))
297 sk->sk_data_ready(sk, skb_len);
301 EXPORT_SYMBOL(sock_queue_rcv_skb);
303 int sk_receive_skb(struct sock *sk, struct sk_buff *skb, const int nested)
305 int rc = NET_RX_SUCCESS;
307 if (sk_filter(sk, skb))
308 goto discard_and_relse;
313 bh_lock_sock_nested(sk);
316 if (!sock_owned_by_user(sk)) {
318 * trylock + unlock semantics:
320 mutex_acquire(&sk->sk_lock.dep_map, 0, 1, _RET_IP_);
322 rc = sk->sk_backlog_rcv(sk, skb);
324 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_);
326 sk_add_backlog(sk, skb);
335 EXPORT_SYMBOL(sk_receive_skb);
337 struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie)
339 struct dst_entry *dst = sk->sk_dst_cache;
341 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
342 sk->sk_dst_cache = NULL;
349 EXPORT_SYMBOL(__sk_dst_check);
351 struct dst_entry *sk_dst_check(struct sock *sk, u32 cookie)
353 struct dst_entry *dst = sk_dst_get(sk);
355 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
363 EXPORT_SYMBOL(sk_dst_check);
366 * This is meant for all protocols to use and covers goings on
367 * at the socket level. Everything here is generic.
370 int sock_setsockopt(struct socket *sock, int level, int optname,
371 char __user *optval, int optlen)
373 struct sock *sk=sock->sk;
374 struct sk_filter *filter;
381 * Options without arguments
384 #ifdef SO_DONTLINGER /* Compatibility item... */
385 if (optname == SO_DONTLINGER) {
387 sock_reset_flag(sk, SOCK_LINGER);
393 if (optlen < sizeof(int))
396 if (get_user(val, (int __user *)optval))
405 if (val && !capable(CAP_NET_ADMIN)) {
409 sock_set_flag(sk, SOCK_DBG);
411 sock_reset_flag(sk, SOCK_DBG);
414 sk->sk_reuse = valbool;
422 sock_set_flag(sk, SOCK_LOCALROUTE);
424 sock_reset_flag(sk, SOCK_LOCALROUTE);
427 sock_valbool_flag(sk, SOCK_BROADCAST, valbool);
430 /* Don't error on this BSD doesn't and if you think
431 about it this is right. Otherwise apps have to
432 play 'guess the biggest size' games. RCVBUF/SNDBUF
433 are treated in BSD as hints */
435 if (val > sysctl_wmem_max)
436 val = sysctl_wmem_max;
438 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
439 if ((val * 2) < SOCK_MIN_SNDBUF)
440 sk->sk_sndbuf = SOCK_MIN_SNDBUF;
442 sk->sk_sndbuf = val * 2;
445 * Wake up sending tasks if we
448 sk->sk_write_space(sk);
452 if (!capable(CAP_NET_ADMIN)) {
459 /* Don't error on this BSD doesn't and if you think
460 about it this is right. Otherwise apps have to
461 play 'guess the biggest size' games. RCVBUF/SNDBUF
462 are treated in BSD as hints */
464 if (val > sysctl_rmem_max)
465 val = sysctl_rmem_max;
467 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
469 * We double it on the way in to account for
470 * "struct sk_buff" etc. overhead. Applications
471 * assume that the SO_RCVBUF setting they make will
472 * allow that much actual data to be received on that
475 * Applications are unaware that "struct sk_buff" and
476 * other overheads allocate from the receive buffer
477 * during socket buffer allocation.
479 * And after considering the possible alternatives,
480 * returning the value we actually used in getsockopt
481 * is the most desirable behavior.
483 if ((val * 2) < SOCK_MIN_RCVBUF)
484 sk->sk_rcvbuf = SOCK_MIN_RCVBUF;
486 sk->sk_rcvbuf = val * 2;
490 if (!capable(CAP_NET_ADMIN)) {
498 if (sk->sk_protocol == IPPROTO_TCP)
499 tcp_set_keepalive(sk, valbool);
501 sock_valbool_flag(sk, SOCK_KEEPOPEN, valbool);
505 sock_valbool_flag(sk, SOCK_URGINLINE, valbool);
509 sk->sk_no_check = valbool;
513 if ((val >= 0 && val <= 6) || capable(CAP_NET_ADMIN))
514 sk->sk_priority = val;
520 if (optlen < sizeof(ling)) {
521 ret = -EINVAL; /* 1003.1g */
524 if (copy_from_user(&ling,optval,sizeof(ling))) {
529 sock_reset_flag(sk, SOCK_LINGER);
531 #if (BITS_PER_LONG == 32)
532 if ((unsigned int)ling.l_linger >= MAX_SCHEDULE_TIMEOUT/HZ)
533 sk->sk_lingertime = MAX_SCHEDULE_TIMEOUT;
536 sk->sk_lingertime = (unsigned int)ling.l_linger * HZ;
537 sock_set_flag(sk, SOCK_LINGER);
542 sock_warn_obsolete_bsdism("setsockopt");
547 set_bit(SOCK_PASSCRED, &sock->flags);
549 clear_bit(SOCK_PASSCRED, &sock->flags);
555 if (optname == SO_TIMESTAMP)
556 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
558 sock_set_flag(sk, SOCK_RCVTSTAMPNS);
559 sock_set_flag(sk, SOCK_RCVTSTAMP);
560 sock_enable_timestamp(sk);
562 sock_reset_flag(sk, SOCK_RCVTSTAMP);
563 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
570 sk->sk_rcvlowat = val ? : 1;
574 ret = sock_set_timeout(&sk->sk_rcvtimeo, optval, optlen);
578 ret = sock_set_timeout(&sk->sk_sndtimeo, optval, optlen);
581 #ifdef CONFIG_NETDEVICES
582 case SO_BINDTODEVICE:
584 char devname[IFNAMSIZ];
587 if (!capable(CAP_NET_RAW)) {
592 /* Bind this socket to a particular device like "eth0",
593 * as specified in the passed interface name. If the
594 * name is "" or the option length is zero the socket
599 sk->sk_bound_dev_if = 0;
601 if (optlen > IFNAMSIZ - 1)
602 optlen = IFNAMSIZ - 1;
603 memset(devname, 0, sizeof(devname));
604 if (copy_from_user(devname, optval, optlen)) {
609 /* Remove any cached route for this socket. */
612 if (devname[0] == '\0') {
613 sk->sk_bound_dev_if = 0;
615 struct net_device *dev = dev_get_by_name(devname);
620 sk->sk_bound_dev_if = dev->ifindex;
629 case SO_ATTACH_FILTER:
631 if (optlen == sizeof(struct sock_fprog)) {
632 struct sock_fprog fprog;
635 if (copy_from_user(&fprog, optval, sizeof(fprog)))
638 ret = sk_attach_filter(&fprog, sk);
642 case SO_DETACH_FILTER:
644 filter = rcu_dereference(sk->sk_filter);
646 rcu_assign_pointer(sk->sk_filter, NULL);
647 sk_filter_release(sk, filter);
648 rcu_read_unlock_bh();
651 rcu_read_unlock_bh();
657 set_bit(SOCK_PASSSEC, &sock->flags);
659 clear_bit(SOCK_PASSSEC, &sock->flags);
662 /* We implement the SO_SNDLOWAT etc to
663 not be settable (1003.1g 5.3) */
673 int sock_getsockopt(struct socket *sock, int level, int optname,
674 char __user *optval, int __user *optlen)
676 struct sock *sk = sock->sk;
684 unsigned int lv = sizeof(int);
687 if (get_user(len, optlen))
694 v.val = sock_flag(sk, SOCK_DBG);
698 v.val = sock_flag(sk, SOCK_LOCALROUTE);
702 v.val = !!sock_flag(sk, SOCK_BROADCAST);
706 v.val = sk->sk_sndbuf;
710 v.val = sk->sk_rcvbuf;
714 v.val = sk->sk_reuse;
718 v.val = !!sock_flag(sk, SOCK_KEEPOPEN);
726 v.val = -sock_error(sk);
728 v.val = xchg(&sk->sk_err_soft, 0);
732 v.val = !!sock_flag(sk, SOCK_URGINLINE);
736 v.val = sk->sk_no_check;
740 v.val = sk->sk_priority;
745 v.ling.l_onoff = !!sock_flag(sk, SOCK_LINGER);
746 v.ling.l_linger = sk->sk_lingertime / HZ;
750 sock_warn_obsolete_bsdism("getsockopt");
754 v.val = sock_flag(sk, SOCK_RCVTSTAMP) &&
755 !sock_flag(sk, SOCK_RCVTSTAMPNS);
759 v.val = sock_flag(sk, SOCK_RCVTSTAMPNS);
763 lv=sizeof(struct timeval);
764 if (sk->sk_rcvtimeo == MAX_SCHEDULE_TIMEOUT) {
768 v.tm.tv_sec = sk->sk_rcvtimeo / HZ;
769 v.tm.tv_usec = ((sk->sk_rcvtimeo % HZ) * 1000000) / HZ;
774 lv=sizeof(struct timeval);
775 if (sk->sk_sndtimeo == MAX_SCHEDULE_TIMEOUT) {
779 v.tm.tv_sec = sk->sk_sndtimeo / HZ;
780 v.tm.tv_usec = ((sk->sk_sndtimeo % HZ) * 1000000) / HZ;
785 v.val = sk->sk_rcvlowat;
793 v.val = test_bit(SOCK_PASSCRED, &sock->flags) ? 1 : 0;
797 if (len > sizeof(sk->sk_peercred))
798 len = sizeof(sk->sk_peercred);
799 if (copy_to_user(optval, &sk->sk_peercred, len))
807 if (sock->ops->getname(sock, (struct sockaddr *)address, &lv, 2))
811 if (copy_to_user(optval, address, len))
816 /* Dubious BSD thing... Probably nobody even uses it, but
817 * the UNIX standard wants it for whatever reason... -DaveM
820 v.val = sk->sk_state == TCP_LISTEN;
824 v.val = test_bit(SOCK_PASSSEC, &sock->flags) ? 1 : 0;
828 return security_socket_getpeersec_stream(sock, optval, optlen, len);
836 if (copy_to_user(optval, &v, len))
839 if (put_user(len, optlen))
845 * Initialize an sk_lock.
847 * (We also register the sk_lock with the lock validator.)
849 static inline void sock_lock_init(struct sock *sk)
851 sock_lock_init_class_and_name(sk,
852 af_family_slock_key_strings[sk->sk_family],
853 af_family_slock_keys + sk->sk_family,
854 af_family_key_strings[sk->sk_family],
855 af_family_keys + sk->sk_family);
859 * sk_alloc - All socket objects are allocated here
860 * @family: protocol family
861 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
862 * @prot: struct proto associated with this new sock instance
863 * @zero_it: if we should zero the newly allocated sock
865 struct sock *sk_alloc(int family, gfp_t priority,
866 struct proto *prot, int zero_it)
868 struct sock *sk = NULL;
869 struct kmem_cache *slab = prot->slab;
872 sk = kmem_cache_alloc(slab, priority);
874 sk = kmalloc(prot->obj_size, priority);
878 memset(sk, 0, prot->obj_size);
879 sk->sk_family = family;
881 * See comment in struct sock definition to understand
882 * why we need sk_prot_creator -acme
884 sk->sk_prot = sk->sk_prot_creator = prot;
888 if (security_sk_alloc(sk, family, priority))
891 if (!try_module_get(prot->owner))
898 kmem_cache_free(slab, sk);
904 void sk_free(struct sock *sk)
906 struct sk_filter *filter;
907 struct module *owner = sk->sk_prot_creator->owner;
912 filter = rcu_dereference(sk->sk_filter);
914 sk_filter_release(sk, filter);
915 rcu_assign_pointer(sk->sk_filter, NULL);
918 sock_disable_timestamp(sk);
920 if (atomic_read(&sk->sk_omem_alloc))
921 printk(KERN_DEBUG "%s: optmem leakage (%d bytes) detected.\n",
922 __FUNCTION__, atomic_read(&sk->sk_omem_alloc));
924 security_sk_free(sk);
925 if (sk->sk_prot_creator->slab != NULL)
926 kmem_cache_free(sk->sk_prot_creator->slab, sk);
932 struct sock *sk_clone(const struct sock *sk, const gfp_t priority)
934 struct sock *newsk = sk_alloc(sk->sk_family, priority, sk->sk_prot, 0);
937 struct sk_filter *filter;
939 sock_copy(newsk, sk);
942 sk_node_init(&newsk->sk_node);
943 sock_lock_init(newsk);
945 newsk->sk_backlog.head = newsk->sk_backlog.tail = NULL;
947 atomic_set(&newsk->sk_rmem_alloc, 0);
948 atomic_set(&newsk->sk_wmem_alloc, 0);
949 atomic_set(&newsk->sk_omem_alloc, 0);
950 skb_queue_head_init(&newsk->sk_receive_queue);
951 skb_queue_head_init(&newsk->sk_write_queue);
952 #ifdef CONFIG_NET_DMA
953 skb_queue_head_init(&newsk->sk_async_wait_queue);
956 rwlock_init(&newsk->sk_dst_lock);
957 rwlock_init(&newsk->sk_callback_lock);
958 lockdep_set_class_and_name(&newsk->sk_callback_lock,
959 af_callback_keys + newsk->sk_family,
960 af_family_clock_key_strings[newsk->sk_family]);
962 newsk->sk_dst_cache = NULL;
963 newsk->sk_wmem_queued = 0;
964 newsk->sk_forward_alloc = 0;
965 newsk->sk_send_head = NULL;
966 newsk->sk_userlocks = sk->sk_userlocks & ~SOCK_BINDPORT_LOCK;
968 sock_reset_flag(newsk, SOCK_DONE);
969 skb_queue_head_init(&newsk->sk_error_queue);
971 filter = newsk->sk_filter;
973 sk_filter_charge(newsk, filter);
975 if (unlikely(xfrm_sk_clone_policy(newsk))) {
976 /* It is still raw copy of parent, so invalidate
977 * destructor and make plain sk_free() */
978 newsk->sk_destruct = NULL;
985 newsk->sk_priority = 0;
986 atomic_set(&newsk->sk_refcnt, 2);
989 * Increment the counter in the same struct proto as the master
990 * sock (sk_refcnt_debug_inc uses newsk->sk_prot->socks, that
991 * is the same as sk->sk_prot->socks, as this field was copied
994 * This _changes_ the previous behaviour, where
995 * tcp_create_openreq_child always was incrementing the
996 * equivalent to tcp_prot->socks (inet_sock_nr), so this have
997 * to be taken into account in all callers. -acme
999 sk_refcnt_debug_inc(newsk);
1000 newsk->sk_socket = NULL;
1001 newsk->sk_sleep = NULL;
1003 if (newsk->sk_prot->sockets_allocated)
1004 atomic_inc(newsk->sk_prot->sockets_allocated);
1010 EXPORT_SYMBOL_GPL(sk_clone);
1012 void sk_setup_caps(struct sock *sk, struct dst_entry *dst)
1014 __sk_dst_set(sk, dst);
1015 sk->sk_route_caps = dst->dev->features;
1016 if (sk->sk_route_caps & NETIF_F_GSO)
1017 sk->sk_route_caps |= NETIF_F_GSO_SOFTWARE;
1018 if (sk_can_gso(sk)) {
1019 if (dst->header_len)
1020 sk->sk_route_caps &= ~NETIF_F_GSO_MASK;
1022 sk->sk_route_caps |= NETIF_F_SG | NETIF_F_HW_CSUM;
1025 EXPORT_SYMBOL_GPL(sk_setup_caps);
1027 void __init sk_init(void)
1029 if (num_physpages <= 4096) {
1030 sysctl_wmem_max = 32767;
1031 sysctl_rmem_max = 32767;
1032 sysctl_wmem_default = 32767;
1033 sysctl_rmem_default = 32767;
1034 } else if (num_physpages >= 131072) {
1035 sysctl_wmem_max = 131071;
1036 sysctl_rmem_max = 131071;
1041 * Simple resource managers for sockets.
1046 * Write buffer destructor automatically called from kfree_skb.
1048 void sock_wfree(struct sk_buff *skb)
1050 struct sock *sk = skb->sk;
1052 /* In case it might be waiting for more memory. */
1053 atomic_sub(skb->truesize, &sk->sk_wmem_alloc);
1054 if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE))
1055 sk->sk_write_space(sk);
1060 * Read buffer destructor automatically called from kfree_skb.
1062 void sock_rfree(struct sk_buff *skb)
1064 struct sock *sk = skb->sk;
1066 atomic_sub(skb->truesize, &sk->sk_rmem_alloc);
1070 int sock_i_uid(struct sock *sk)
1074 read_lock(&sk->sk_callback_lock);
1075 uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : 0;
1076 read_unlock(&sk->sk_callback_lock);
1080 unsigned long sock_i_ino(struct sock *sk)
1084 read_lock(&sk->sk_callback_lock);
1085 ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0;
1086 read_unlock(&sk->sk_callback_lock);
1091 * Allocate a skb from the socket's send buffer.
1093 struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force,
1096 if (force || atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
1097 struct sk_buff * skb = alloc_skb(size, priority);
1099 skb_set_owner_w(skb, sk);
1107 * Allocate a skb from the socket's receive buffer.
1109 struct sk_buff *sock_rmalloc(struct sock *sk, unsigned long size, int force,
1112 if (force || atomic_read(&sk->sk_rmem_alloc) < sk->sk_rcvbuf) {
1113 struct sk_buff *skb = alloc_skb(size, priority);
1115 skb_set_owner_r(skb, sk);
1123 * Allocate a memory block from the socket's option memory buffer.
1125 void *sock_kmalloc(struct sock *sk, int size, gfp_t priority)
1127 if ((unsigned)size <= sysctl_optmem_max &&
1128 atomic_read(&sk->sk_omem_alloc) + size < sysctl_optmem_max) {
1130 /* First do the add, to avoid the race if kmalloc
1133 atomic_add(size, &sk->sk_omem_alloc);
1134 mem = kmalloc(size, priority);
1137 atomic_sub(size, &sk->sk_omem_alloc);
1143 * Free an option memory block.
1145 void sock_kfree_s(struct sock *sk, void *mem, int size)
1148 atomic_sub(size, &sk->sk_omem_alloc);
1151 /* It is almost wait_for_tcp_memory minus release_sock/lock_sock.
1152 I think, these locks should be removed for datagram sockets.
1154 static long sock_wait_for_wmem(struct sock * sk, long timeo)
1158 clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1162 if (signal_pending(current))
1164 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1165 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
1166 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf)
1168 if (sk->sk_shutdown & SEND_SHUTDOWN)
1172 timeo = schedule_timeout(timeo);
1174 finish_wait(sk->sk_sleep, &wait);
1180 * Generic send/receive buffer handlers
1183 static struct sk_buff *sock_alloc_send_pskb(struct sock *sk,
1184 unsigned long header_len,
1185 unsigned long data_len,
1186 int noblock, int *errcode)
1188 struct sk_buff *skb;
1193 gfp_mask = sk->sk_allocation;
1194 if (gfp_mask & __GFP_WAIT)
1195 gfp_mask |= __GFP_REPEAT;
1197 timeo = sock_sndtimeo(sk, noblock);
1199 err = sock_error(sk);
1204 if (sk->sk_shutdown & SEND_SHUTDOWN)
1207 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
1208 skb = alloc_skb(header_len, gfp_mask);
1213 /* No pages, we're done... */
1217 npages = (data_len + (PAGE_SIZE - 1)) >> PAGE_SHIFT;
1218 skb->truesize += data_len;
1219 skb_shinfo(skb)->nr_frags = npages;
1220 for (i = 0; i < npages; i++) {
1224 page = alloc_pages(sk->sk_allocation, 0);
1227 skb_shinfo(skb)->nr_frags = i;
1232 frag = &skb_shinfo(skb)->frags[i];
1234 frag->page_offset = 0;
1235 frag->size = (data_len >= PAGE_SIZE ?
1238 data_len -= PAGE_SIZE;
1241 /* Full success... */
1247 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1248 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1252 if (signal_pending(current))
1254 timeo = sock_wait_for_wmem(sk, timeo);
1257 skb_set_owner_w(skb, sk);
1261 err = sock_intr_errno(timeo);
1267 struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size,
1268 int noblock, int *errcode)
1270 return sock_alloc_send_pskb(sk, size, 0, noblock, errcode);
1273 static void __lock_sock(struct sock *sk)
1278 prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait,
1279 TASK_UNINTERRUPTIBLE);
1280 spin_unlock_bh(&sk->sk_lock.slock);
1282 spin_lock_bh(&sk->sk_lock.slock);
1283 if (!sock_owned_by_user(sk))
1286 finish_wait(&sk->sk_lock.wq, &wait);
1289 static void __release_sock(struct sock *sk)
1291 struct sk_buff *skb = sk->sk_backlog.head;
1294 sk->sk_backlog.head = sk->sk_backlog.tail = NULL;
1298 struct sk_buff *next = skb->next;
1301 sk->sk_backlog_rcv(sk, skb);
1304 * We are in process context here with softirqs
1305 * disabled, use cond_resched_softirq() to preempt.
1306 * This is safe to do because we've taken the backlog
1309 cond_resched_softirq();
1312 } while (skb != NULL);
1315 } while ((skb = sk->sk_backlog.head) != NULL);
1319 * sk_wait_data - wait for data to arrive at sk_receive_queue
1320 * @sk: sock to wait on
1321 * @timeo: for how long
1323 * Now socket state including sk->sk_err is changed only under lock,
1324 * hence we may omit checks after joining wait queue.
1325 * We check receive queue before schedule() only as optimization;
1326 * it is very likely that release_sock() added new data.
1328 int sk_wait_data(struct sock *sk, long *timeo)
1333 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
1334 set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
1335 rc = sk_wait_event(sk, timeo, !skb_queue_empty(&sk->sk_receive_queue));
1336 clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
1337 finish_wait(sk->sk_sleep, &wait);
1341 EXPORT_SYMBOL(sk_wait_data);
1344 * Set of default routines for initialising struct proto_ops when
1345 * the protocol does not support a particular function. In certain
1346 * cases where it makes no sense for a protocol to have a "do nothing"
1347 * function, some default processing is provided.
1350 int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len)
1355 int sock_no_connect(struct socket *sock, struct sockaddr *saddr,
1361 int sock_no_socketpair(struct socket *sock1, struct socket *sock2)
1366 int sock_no_accept(struct socket *sock, struct socket *newsock, int flags)
1371 int sock_no_getname(struct socket *sock, struct sockaddr *saddr,
1377 unsigned int sock_no_poll(struct file * file, struct socket *sock, poll_table *pt)
1382 int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1387 int sock_no_listen(struct socket *sock, int backlog)
1392 int sock_no_shutdown(struct socket *sock, int how)
1397 int sock_no_setsockopt(struct socket *sock, int level, int optname,
1398 char __user *optval, int optlen)
1403 int sock_no_getsockopt(struct socket *sock, int level, int optname,
1404 char __user *optval, int __user *optlen)
1409 int sock_no_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
1415 int sock_no_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
1416 size_t len, int flags)
1421 int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma)
1423 /* Mirror missing mmap method error code */
1427 ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags)
1430 struct msghdr msg = {.msg_flags = flags};
1432 char *kaddr = kmap(page);
1433 iov.iov_base = kaddr + offset;
1435 res = kernel_sendmsg(sock, &msg, &iov, 1, size);
1441 * Default Socket Callbacks
1444 static void sock_def_wakeup(struct sock *sk)
1446 read_lock(&sk->sk_callback_lock);
1447 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
1448 wake_up_interruptible_all(sk->sk_sleep);
1449 read_unlock(&sk->sk_callback_lock);
1452 static void sock_def_error_report(struct sock *sk)
1454 read_lock(&sk->sk_callback_lock);
1455 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
1456 wake_up_interruptible(sk->sk_sleep);
1457 sk_wake_async(sk,0,POLL_ERR);
1458 read_unlock(&sk->sk_callback_lock);
1461 static void sock_def_readable(struct sock *sk, int len)
1463 read_lock(&sk->sk_callback_lock);
1464 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
1465 wake_up_interruptible(sk->sk_sleep);
1466 sk_wake_async(sk,1,POLL_IN);
1467 read_unlock(&sk->sk_callback_lock);
1470 static void sock_def_write_space(struct sock *sk)
1472 read_lock(&sk->sk_callback_lock);
1474 /* Do not wake up a writer until he can make "significant"
1477 if ((atomic_read(&sk->sk_wmem_alloc) << 1) <= sk->sk_sndbuf) {
1478 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
1479 wake_up_interruptible(sk->sk_sleep);
1481 /* Should agree with poll, otherwise some programs break */
1482 if (sock_writeable(sk))
1483 sk_wake_async(sk, 2, POLL_OUT);
1486 read_unlock(&sk->sk_callback_lock);
1489 static void sock_def_destruct(struct sock *sk)
1491 kfree(sk->sk_protinfo);
1494 void sk_send_sigurg(struct sock *sk)
1496 if (sk->sk_socket && sk->sk_socket->file)
1497 if (send_sigurg(&sk->sk_socket->file->f_owner))
1498 sk_wake_async(sk, 3, POLL_PRI);
1501 void sk_reset_timer(struct sock *sk, struct timer_list* timer,
1502 unsigned long expires)
1504 if (!mod_timer(timer, expires))
1508 EXPORT_SYMBOL(sk_reset_timer);
1510 void sk_stop_timer(struct sock *sk, struct timer_list* timer)
1512 if (timer_pending(timer) && del_timer(timer))
1516 EXPORT_SYMBOL(sk_stop_timer);
1518 void sock_init_data(struct socket *sock, struct sock *sk)
1520 skb_queue_head_init(&sk->sk_receive_queue);
1521 skb_queue_head_init(&sk->sk_write_queue);
1522 skb_queue_head_init(&sk->sk_error_queue);
1523 #ifdef CONFIG_NET_DMA
1524 skb_queue_head_init(&sk->sk_async_wait_queue);
1527 sk->sk_send_head = NULL;
1529 init_timer(&sk->sk_timer);
1531 sk->sk_allocation = GFP_KERNEL;
1532 sk->sk_rcvbuf = sysctl_rmem_default;
1533 sk->sk_sndbuf = sysctl_wmem_default;
1534 sk->sk_state = TCP_CLOSE;
1535 sk->sk_socket = sock;
1537 sock_set_flag(sk, SOCK_ZAPPED);
1540 sk->sk_type = sock->type;
1541 sk->sk_sleep = &sock->wait;
1544 sk->sk_sleep = NULL;
1546 rwlock_init(&sk->sk_dst_lock);
1547 rwlock_init(&sk->sk_callback_lock);
1548 lockdep_set_class_and_name(&sk->sk_callback_lock,
1549 af_callback_keys + sk->sk_family,
1550 af_family_clock_key_strings[sk->sk_family]);
1552 sk->sk_state_change = sock_def_wakeup;
1553 sk->sk_data_ready = sock_def_readable;
1554 sk->sk_write_space = sock_def_write_space;
1555 sk->sk_error_report = sock_def_error_report;
1556 sk->sk_destruct = sock_def_destruct;
1558 sk->sk_sndmsg_page = NULL;
1559 sk->sk_sndmsg_off = 0;
1561 sk->sk_peercred.pid = 0;
1562 sk->sk_peercred.uid = -1;
1563 sk->sk_peercred.gid = -1;
1564 sk->sk_write_pending = 0;
1565 sk->sk_rcvlowat = 1;
1566 sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT;
1567 sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT;
1569 sk->sk_stamp = ktime_set(-1L, -1L);
1571 atomic_set(&sk->sk_refcnt, 1);
1574 void fastcall lock_sock_nested(struct sock *sk, int subclass)
1577 spin_lock_bh(&sk->sk_lock.slock);
1578 if (sk->sk_lock.owner)
1580 sk->sk_lock.owner = (void *)1;
1581 spin_unlock(&sk->sk_lock.slock);
1583 * The sk_lock has mutex_lock() semantics here:
1585 mutex_acquire(&sk->sk_lock.dep_map, subclass, 0, _RET_IP_);
1589 EXPORT_SYMBOL(lock_sock_nested);
1591 void fastcall release_sock(struct sock *sk)
1594 * The sk_lock has mutex_unlock() semantics:
1596 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_);
1598 spin_lock_bh(&sk->sk_lock.slock);
1599 if (sk->sk_backlog.tail)
1601 sk->sk_lock.owner = NULL;
1602 if (waitqueue_active(&sk->sk_lock.wq))
1603 wake_up(&sk->sk_lock.wq);
1604 spin_unlock_bh(&sk->sk_lock.slock);
1606 EXPORT_SYMBOL(release_sock);
1608 int sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp)
1611 if (!sock_flag(sk, SOCK_TIMESTAMP))
1612 sock_enable_timestamp(sk);
1613 tv = ktime_to_timeval(sk->sk_stamp);
1614 if (tv.tv_sec == -1)
1616 if (tv.tv_sec == 0) {
1617 sk->sk_stamp = ktime_get_real();
1618 tv = ktime_to_timeval(sk->sk_stamp);
1620 return copy_to_user(userstamp, &tv, sizeof(tv)) ? -EFAULT : 0;
1622 EXPORT_SYMBOL(sock_get_timestamp);
1624 int sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp)
1627 if (!sock_flag(sk, SOCK_TIMESTAMP))
1628 sock_enable_timestamp(sk);
1629 ts = ktime_to_timespec(sk->sk_stamp);
1630 if (ts.tv_sec == -1)
1632 if (ts.tv_sec == 0) {
1633 sk->sk_stamp = ktime_get_real();
1634 ts = ktime_to_timespec(sk->sk_stamp);
1636 return copy_to_user(userstamp, &ts, sizeof(ts)) ? -EFAULT : 0;
1638 EXPORT_SYMBOL(sock_get_timestampns);
1640 void sock_enable_timestamp(struct sock *sk)
1642 if (!sock_flag(sk, SOCK_TIMESTAMP)) {
1643 sock_set_flag(sk, SOCK_TIMESTAMP);
1644 net_enable_timestamp();
1647 EXPORT_SYMBOL(sock_enable_timestamp);
1650 * Get a socket option on an socket.
1652 * FIX: POSIX 1003.1g is very ambiguous here. It states that
1653 * asynchronous errors should be reported by getsockopt. We assume
1654 * this means if you specify SO_ERROR (otherwise whats the point of it).
1656 int sock_common_getsockopt(struct socket *sock, int level, int optname,
1657 char __user *optval, int __user *optlen)
1659 struct sock *sk = sock->sk;
1661 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
1664 EXPORT_SYMBOL(sock_common_getsockopt);
1666 #ifdef CONFIG_COMPAT
1667 int compat_sock_common_getsockopt(struct socket *sock, int level, int optname,
1668 char __user *optval, int __user *optlen)
1670 struct sock *sk = sock->sk;
1672 if (sk->sk_prot->compat_getsockopt != NULL)
1673 return sk->sk_prot->compat_getsockopt(sk, level, optname,
1675 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
1677 EXPORT_SYMBOL(compat_sock_common_getsockopt);
1680 int sock_common_recvmsg(struct kiocb *iocb, struct socket *sock,
1681 struct msghdr *msg, size_t size, int flags)
1683 struct sock *sk = sock->sk;
1687 err = sk->sk_prot->recvmsg(iocb, sk, msg, size, flags & MSG_DONTWAIT,
1688 flags & ~MSG_DONTWAIT, &addr_len);
1690 msg->msg_namelen = addr_len;
1694 EXPORT_SYMBOL(sock_common_recvmsg);
1697 * Set socket options on an inet socket.
1699 int sock_common_setsockopt(struct socket *sock, int level, int optname,
1700 char __user *optval, int optlen)
1702 struct sock *sk = sock->sk;
1704 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
1707 EXPORT_SYMBOL(sock_common_setsockopt);
1709 #ifdef CONFIG_COMPAT
1710 int compat_sock_common_setsockopt(struct socket *sock, int level, int optname,
1711 char __user *optval, int optlen)
1713 struct sock *sk = sock->sk;
1715 if (sk->sk_prot->compat_setsockopt != NULL)
1716 return sk->sk_prot->compat_setsockopt(sk, level, optname,
1718 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
1720 EXPORT_SYMBOL(compat_sock_common_setsockopt);
1723 void sk_common_release(struct sock *sk)
1725 if (sk->sk_prot->destroy)
1726 sk->sk_prot->destroy(sk);
1729 * Observation: when sock_common_release is called, processes have
1730 * no access to socket. But net still has.
1731 * Step one, detach it from networking:
1733 * A. Remove from hash tables.
1736 sk->sk_prot->unhash(sk);
1739 * In this point socket cannot receive new packets, but it is possible
1740 * that some packets are in flight because some CPU runs receiver and
1741 * did hash table lookup before we unhashed socket. They will achieve
1742 * receive queue and will be purged by socket destructor.
1744 * Also we still have packets pending on receive queue and probably,
1745 * our own packets waiting in device queues. sock_destroy will drain
1746 * receive queue, but transmitted packets will delay socket destruction
1747 * until the last reference will be released.
1752 xfrm_sk_free_policy(sk);
1754 sk_refcnt_debug_release(sk);
1758 EXPORT_SYMBOL(sk_common_release);
1760 static DEFINE_RWLOCK(proto_list_lock);
1761 static LIST_HEAD(proto_list);
1763 int proto_register(struct proto *prot, int alloc_slab)
1765 char *request_sock_slab_name = NULL;
1766 char *timewait_sock_slab_name;
1770 prot->slab = kmem_cache_create(prot->name, prot->obj_size, 0,
1771 SLAB_HWCACHE_ALIGN, NULL);
1773 if (prot->slab == NULL) {
1774 printk(KERN_CRIT "%s: Can't create sock SLAB cache!\n",
1779 if (prot->rsk_prot != NULL) {
1780 static const char mask[] = "request_sock_%s";
1782 request_sock_slab_name = kmalloc(strlen(prot->name) + sizeof(mask) - 1, GFP_KERNEL);
1783 if (request_sock_slab_name == NULL)
1784 goto out_free_sock_slab;
1786 sprintf(request_sock_slab_name, mask, prot->name);
1787 prot->rsk_prot->slab = kmem_cache_create(request_sock_slab_name,
1788 prot->rsk_prot->obj_size, 0,
1789 SLAB_HWCACHE_ALIGN, NULL);
1791 if (prot->rsk_prot->slab == NULL) {
1792 printk(KERN_CRIT "%s: Can't create request sock SLAB cache!\n",
1794 goto out_free_request_sock_slab_name;
1798 if (prot->twsk_prot != NULL) {
1799 static const char mask[] = "tw_sock_%s";
1801 timewait_sock_slab_name = kmalloc(strlen(prot->name) + sizeof(mask) - 1, GFP_KERNEL);
1803 if (timewait_sock_slab_name == NULL)
1804 goto out_free_request_sock_slab;
1806 sprintf(timewait_sock_slab_name, mask, prot->name);
1807 prot->twsk_prot->twsk_slab =
1808 kmem_cache_create(timewait_sock_slab_name,
1809 prot->twsk_prot->twsk_obj_size,
1810 0, SLAB_HWCACHE_ALIGN,
1812 if (prot->twsk_prot->twsk_slab == NULL)
1813 goto out_free_timewait_sock_slab_name;
1817 write_lock(&proto_list_lock);
1818 list_add(&prot->node, &proto_list);
1819 write_unlock(&proto_list_lock);
1823 out_free_timewait_sock_slab_name:
1824 kfree(timewait_sock_slab_name);
1825 out_free_request_sock_slab:
1826 if (prot->rsk_prot && prot->rsk_prot->slab) {
1827 kmem_cache_destroy(prot->rsk_prot->slab);
1828 prot->rsk_prot->slab = NULL;
1830 out_free_request_sock_slab_name:
1831 kfree(request_sock_slab_name);
1833 kmem_cache_destroy(prot->slab);
1838 EXPORT_SYMBOL(proto_register);
1840 void proto_unregister(struct proto *prot)
1842 write_lock(&proto_list_lock);
1843 list_del(&prot->node);
1844 write_unlock(&proto_list_lock);
1846 if (prot->slab != NULL) {
1847 kmem_cache_destroy(prot->slab);
1851 if (prot->rsk_prot != NULL && prot->rsk_prot->slab != NULL) {
1852 const char *name = kmem_cache_name(prot->rsk_prot->slab);
1854 kmem_cache_destroy(prot->rsk_prot->slab);
1856 prot->rsk_prot->slab = NULL;
1859 if (prot->twsk_prot != NULL && prot->twsk_prot->twsk_slab != NULL) {
1860 const char *name = kmem_cache_name(prot->twsk_prot->twsk_slab);
1862 kmem_cache_destroy(prot->twsk_prot->twsk_slab);
1864 prot->twsk_prot->twsk_slab = NULL;
1868 EXPORT_SYMBOL(proto_unregister);
1870 #ifdef CONFIG_PROC_FS
1871 static void *proto_seq_start(struct seq_file *seq, loff_t *pos)
1873 read_lock(&proto_list_lock);
1874 return seq_list_start_head(&proto_list, *pos);
1877 static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1879 return seq_list_next(v, &proto_list, pos);
1882 static void proto_seq_stop(struct seq_file *seq, void *v)
1884 read_unlock(&proto_list_lock);
1887 static char proto_method_implemented(const void *method)
1889 return method == NULL ? 'n' : 'y';
1892 static void proto_seq_printf(struct seq_file *seq, struct proto *proto)
1894 seq_printf(seq, "%-9s %4u %6d %6d %-3s %6u %-3s %-10s "
1895 "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n",
1898 proto->sockets_allocated != NULL ? atomic_read(proto->sockets_allocated) : -1,
1899 proto->memory_allocated != NULL ? atomic_read(proto->memory_allocated) : -1,
1900 proto->memory_pressure != NULL ? *proto->memory_pressure ? "yes" : "no" : "NI",
1902 proto->slab == NULL ? "no" : "yes",
1903 module_name(proto->owner),
1904 proto_method_implemented(proto->close),
1905 proto_method_implemented(proto->connect),
1906 proto_method_implemented(proto->disconnect),
1907 proto_method_implemented(proto->accept),
1908 proto_method_implemented(proto->ioctl),
1909 proto_method_implemented(proto->init),
1910 proto_method_implemented(proto->destroy),
1911 proto_method_implemented(proto->shutdown),
1912 proto_method_implemented(proto->setsockopt),
1913 proto_method_implemented(proto->getsockopt),
1914 proto_method_implemented(proto->sendmsg),
1915 proto_method_implemented(proto->recvmsg),
1916 proto_method_implemented(proto->sendpage),
1917 proto_method_implemented(proto->bind),
1918 proto_method_implemented(proto->backlog_rcv),
1919 proto_method_implemented(proto->hash),
1920 proto_method_implemented(proto->unhash),
1921 proto_method_implemented(proto->get_port),
1922 proto_method_implemented(proto->enter_memory_pressure));
1925 static int proto_seq_show(struct seq_file *seq, void *v)
1927 if (v == &proto_list)
1928 seq_printf(seq, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s",
1937 "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n");
1939 proto_seq_printf(seq, list_entry(v, struct proto, node));
1943 static const struct seq_operations proto_seq_ops = {
1944 .start = proto_seq_start,
1945 .next = proto_seq_next,
1946 .stop = proto_seq_stop,
1947 .show = proto_seq_show,
1950 static int proto_seq_open(struct inode *inode, struct file *file)
1952 return seq_open(file, &proto_seq_ops);
1955 static const struct file_operations proto_seq_fops = {
1956 .owner = THIS_MODULE,
1957 .open = proto_seq_open,
1959 .llseek = seq_lseek,
1960 .release = seq_release,
1963 static int __init proto_init(void)
1965 /* register /proc/net/protocols */
1966 return proc_net_fops_create("protocols", S_IRUGO, &proto_seq_fops) == NULL ? -ENOBUFS : 0;
1969 subsys_initcall(proto_init);
1971 #endif /* PROC_FS */
1973 EXPORT_SYMBOL(sk_alloc);
1974 EXPORT_SYMBOL(sk_free);
1975 EXPORT_SYMBOL(sk_send_sigurg);
1976 EXPORT_SYMBOL(sock_alloc_send_skb);
1977 EXPORT_SYMBOL(sock_init_data);
1978 EXPORT_SYMBOL(sock_kfree_s);
1979 EXPORT_SYMBOL(sock_kmalloc);
1980 EXPORT_SYMBOL(sock_no_accept);
1981 EXPORT_SYMBOL(sock_no_bind);
1982 EXPORT_SYMBOL(sock_no_connect);
1983 EXPORT_SYMBOL(sock_no_getname);
1984 EXPORT_SYMBOL(sock_no_getsockopt);
1985 EXPORT_SYMBOL(sock_no_ioctl);
1986 EXPORT_SYMBOL(sock_no_listen);
1987 EXPORT_SYMBOL(sock_no_mmap);
1988 EXPORT_SYMBOL(sock_no_poll);
1989 EXPORT_SYMBOL(sock_no_recvmsg);
1990 EXPORT_SYMBOL(sock_no_sendmsg);
1991 EXPORT_SYMBOL(sock_no_sendpage);
1992 EXPORT_SYMBOL(sock_no_setsockopt);
1993 EXPORT_SYMBOL(sock_no_shutdown);
1994 EXPORT_SYMBOL(sock_no_socketpair);
1995 EXPORT_SYMBOL(sock_rfree);
1996 EXPORT_SYMBOL(sock_setsockopt);
1997 EXPORT_SYMBOL(sock_wfree);
1998 EXPORT_SYMBOL(sock_wmalloc);
1999 EXPORT_SYMBOL(sock_i_uid);
2000 EXPORT_SYMBOL(sock_i_ino);
2001 EXPORT_SYMBOL(sysctl_optmem_max);
2002 #ifdef CONFIG_SYSCTL
2003 EXPORT_SYMBOL(sysctl_rmem_max);
2004 EXPORT_SYMBOL(sysctl_wmem_max);