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>
115 #include <asm/uaccess.h>
116 #include <asm/system.h>
118 #include <linux/netdevice.h>
119 #include <net/protocol.h>
120 #include <linux/skbuff.h>
121 #include <net/request_sock.h>
122 #include <net/sock.h>
123 #include <net/xfrm.h>
124 #include <linux/ipsec.h>
126 #include <linux/filter.h>
133 * Each address family might have different locking rules, so we have
134 * one slock key per address family:
136 static struct lock_class_key af_family_keys[AF_MAX];
137 static struct lock_class_key af_family_slock_keys[AF_MAX];
139 #ifdef CONFIG_DEBUG_LOCK_ALLOC
141 * Make lock validator output more readable. (we pre-construct these
142 * strings build-time, so that runtime initialization of socket
145 static const char *af_family_key_strings[AF_MAX+1] = {
146 "sk_lock-AF_UNSPEC", "sk_lock-AF_UNIX" , "sk_lock-AF_INET" ,
147 "sk_lock-AF_AX25" , "sk_lock-AF_IPX" , "sk_lock-AF_APPLETALK",
148 "sk_lock-AF_NETROM", "sk_lock-AF_BRIDGE" , "sk_lock-AF_ATMPVC" ,
149 "sk_lock-AF_X25" , "sk_lock-AF_INET6" , "sk_lock-AF_ROSE" ,
150 "sk_lock-AF_DECnet", "sk_lock-AF_NETBEUI" , "sk_lock-AF_SECURITY" ,
151 "sk_lock-AF_KEY" , "sk_lock-AF_NETLINK" , "sk_lock-AF_PACKET" ,
152 "sk_lock-AF_ASH" , "sk_lock-AF_ECONET" , "sk_lock-AF_ATMSVC" ,
153 "sk_lock-21" , "sk_lock-AF_SNA" , "sk_lock-AF_IRDA" ,
154 "sk_lock-AF_PPPOX" , "sk_lock-AF_WANPIPE" , "sk_lock-AF_LLC" ,
155 "sk_lock-27" , "sk_lock-28" , "sk_lock-29" ,
156 "sk_lock-AF_TIPC" , "sk_lock-AF_BLUETOOTH", "sk_lock-AF_MAX"
158 static const char *af_family_slock_key_strings[AF_MAX+1] = {
159 "slock-AF_UNSPEC", "slock-AF_UNIX" , "slock-AF_INET" ,
160 "slock-AF_AX25" , "slock-AF_IPX" , "slock-AF_APPLETALK",
161 "slock-AF_NETROM", "slock-AF_BRIDGE" , "slock-AF_ATMPVC" ,
162 "slock-AF_X25" , "slock-AF_INET6" , "slock-AF_ROSE" ,
163 "slock-AF_DECnet", "slock-AF_NETBEUI" , "slock-AF_SECURITY" ,
164 "slock-AF_KEY" , "slock-AF_NETLINK" , "slock-AF_PACKET" ,
165 "slock-AF_ASH" , "slock-AF_ECONET" , "slock-AF_ATMSVC" ,
166 "slock-21" , "slock-AF_SNA" , "slock-AF_IRDA" ,
167 "slock-AF_PPPOX" , "slock-AF_WANPIPE" , "slock-AF_LLC" ,
168 "slock-27" , "slock-28" , "slock-29" ,
169 "slock-AF_TIPC" , "slock-AF_BLUETOOTH", "slock-AF_MAX"
174 * sk_callback_lock locking rules are per-address-family,
175 * so split the lock classes by using a per-AF key:
177 static struct lock_class_key af_callback_keys[AF_MAX];
179 /* Take into consideration the size of the struct sk_buff overhead in the
180 * determination of these values, since that is non-constant across
181 * platforms. This makes socket queueing behavior and performance
182 * not depend upon such differences.
184 #define _SK_MEM_PACKETS 256
185 #define _SK_MEM_OVERHEAD (sizeof(struct sk_buff) + 256)
186 #define SK_WMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS)
187 #define SK_RMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS)
189 /* Run time adjustable parameters. */
190 __u32 sysctl_wmem_max __read_mostly = SK_WMEM_MAX;
191 __u32 sysctl_rmem_max __read_mostly = SK_RMEM_MAX;
192 __u32 sysctl_wmem_default __read_mostly = SK_WMEM_MAX;
193 __u32 sysctl_rmem_default __read_mostly = SK_RMEM_MAX;
195 /* Maximal space eaten by iovec or ancilliary data plus some space */
196 int sysctl_optmem_max __read_mostly = sizeof(unsigned long)*(2*UIO_MAXIOV+512);
198 static int sock_set_timeout(long *timeo_p, char __user *optval, int optlen)
202 if (optlen < sizeof(tv))
204 if (copy_from_user(&tv, optval, sizeof(tv)))
207 *timeo_p = MAX_SCHEDULE_TIMEOUT;
208 if (tv.tv_sec == 0 && tv.tv_usec == 0)
210 if (tv.tv_sec < (MAX_SCHEDULE_TIMEOUT/HZ - 1))
211 *timeo_p = tv.tv_sec*HZ + (tv.tv_usec+(1000000/HZ-1))/(1000000/HZ);
215 static void sock_warn_obsolete_bsdism(const char *name)
218 static char warncomm[TASK_COMM_LEN];
219 if (strcmp(warncomm, current->comm) && warned < 5) {
220 strcpy(warncomm, current->comm);
221 printk(KERN_WARNING "process `%s' is using obsolete "
222 "%s SO_BSDCOMPAT\n", warncomm, name);
227 static void sock_disable_timestamp(struct sock *sk)
229 if (sock_flag(sk, SOCK_TIMESTAMP)) {
230 sock_reset_flag(sk, SOCK_TIMESTAMP);
231 net_disable_timestamp();
236 int sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
241 /* Cast skb->rcvbuf to unsigned... It's pointless, but reduces
242 number of warnings when compiling with -W --ANK
244 if (atomic_read(&sk->sk_rmem_alloc) + skb->truesize >=
245 (unsigned)sk->sk_rcvbuf) {
250 err = sk_filter(sk, skb);
255 skb_set_owner_r(skb, sk);
257 /* Cache the SKB length before we tack it onto the receive
258 * queue. Once it is added it no longer belongs to us and
259 * may be freed by other threads of control pulling packets
264 skb_queue_tail(&sk->sk_receive_queue, skb);
266 if (!sock_flag(sk, SOCK_DEAD))
267 sk->sk_data_ready(sk, skb_len);
271 EXPORT_SYMBOL(sock_queue_rcv_skb);
273 int sk_receive_skb(struct sock *sk, struct sk_buff *skb, const int nested)
275 int rc = NET_RX_SUCCESS;
277 if (sk_filter(sk, skb))
278 goto discard_and_relse;
283 bh_lock_sock_nested(sk);
286 if (!sock_owned_by_user(sk)) {
288 * trylock + unlock semantics:
290 mutex_acquire(&sk->sk_lock.dep_map, 0, 1, _RET_IP_);
292 rc = sk->sk_backlog_rcv(sk, skb);
294 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_);
296 sk_add_backlog(sk, skb);
305 EXPORT_SYMBOL(sk_receive_skb);
307 struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie)
309 struct dst_entry *dst = sk->sk_dst_cache;
311 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
312 sk->sk_dst_cache = NULL;
319 EXPORT_SYMBOL(__sk_dst_check);
321 struct dst_entry *sk_dst_check(struct sock *sk, u32 cookie)
323 struct dst_entry *dst = sk_dst_get(sk);
325 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
333 EXPORT_SYMBOL(sk_dst_check);
336 * This is meant for all protocols to use and covers goings on
337 * at the socket level. Everything here is generic.
340 int sock_setsockopt(struct socket *sock, int level, int optname,
341 char __user *optval, int optlen)
343 struct sock *sk=sock->sk;
344 struct sk_filter *filter;
351 * Options without arguments
354 #ifdef SO_DONTLINGER /* Compatibility item... */
355 if (optname == SO_DONTLINGER) {
357 sock_reset_flag(sk, SOCK_LINGER);
363 if(optlen<sizeof(int))
366 if (get_user(val, (int __user *)optval))
376 if(val && !capable(CAP_NET_ADMIN))
381 sock_set_flag(sk, SOCK_DBG);
383 sock_reset_flag(sk, SOCK_DBG);
386 sk->sk_reuse = valbool;
394 sock_set_flag(sk, SOCK_LOCALROUTE);
396 sock_reset_flag(sk, SOCK_LOCALROUTE);
399 sock_valbool_flag(sk, SOCK_BROADCAST, valbool);
402 /* Don't error on this BSD doesn't and if you think
403 about it this is right. Otherwise apps have to
404 play 'guess the biggest size' games. RCVBUF/SNDBUF
405 are treated in BSD as hints */
407 if (val > sysctl_wmem_max)
408 val = sysctl_wmem_max;
410 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
411 if ((val * 2) < SOCK_MIN_SNDBUF)
412 sk->sk_sndbuf = SOCK_MIN_SNDBUF;
414 sk->sk_sndbuf = val * 2;
417 * Wake up sending tasks if we
420 sk->sk_write_space(sk);
424 if (!capable(CAP_NET_ADMIN)) {
431 /* Don't error on this BSD doesn't and if you think
432 about it this is right. Otherwise apps have to
433 play 'guess the biggest size' games. RCVBUF/SNDBUF
434 are treated in BSD as hints */
436 if (val > sysctl_rmem_max)
437 val = sysctl_rmem_max;
439 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
441 * We double it on the way in to account for
442 * "struct sk_buff" etc. overhead. Applications
443 * assume that the SO_RCVBUF setting they make will
444 * allow that much actual data to be received on that
447 * Applications are unaware that "struct sk_buff" and
448 * other overheads allocate from the receive buffer
449 * during socket buffer allocation.
451 * And after considering the possible alternatives,
452 * returning the value we actually used in getsockopt
453 * is the most desirable behavior.
455 if ((val * 2) < SOCK_MIN_RCVBUF)
456 sk->sk_rcvbuf = SOCK_MIN_RCVBUF;
458 sk->sk_rcvbuf = val * 2;
462 if (!capable(CAP_NET_ADMIN)) {
470 if (sk->sk_protocol == IPPROTO_TCP)
471 tcp_set_keepalive(sk, valbool);
473 sock_valbool_flag(sk, SOCK_KEEPOPEN, valbool);
477 sock_valbool_flag(sk, SOCK_URGINLINE, valbool);
481 sk->sk_no_check = valbool;
485 if ((val >= 0 && val <= 6) || capable(CAP_NET_ADMIN))
486 sk->sk_priority = val;
492 if(optlen<sizeof(ling)) {
493 ret = -EINVAL; /* 1003.1g */
496 if (copy_from_user(&ling,optval,sizeof(ling))) {
501 sock_reset_flag(sk, SOCK_LINGER);
503 #if (BITS_PER_LONG == 32)
504 if ((unsigned int)ling.l_linger >= MAX_SCHEDULE_TIMEOUT/HZ)
505 sk->sk_lingertime = MAX_SCHEDULE_TIMEOUT;
508 sk->sk_lingertime = (unsigned int)ling.l_linger * HZ;
509 sock_set_flag(sk, SOCK_LINGER);
514 sock_warn_obsolete_bsdism("setsockopt");
519 set_bit(SOCK_PASSCRED, &sock->flags);
521 clear_bit(SOCK_PASSCRED, &sock->flags);
526 sock_set_flag(sk, SOCK_RCVTSTAMP);
527 sock_enable_timestamp(sk);
529 sock_reset_flag(sk, SOCK_RCVTSTAMP);
535 sk->sk_rcvlowat = val ? : 1;
539 ret = sock_set_timeout(&sk->sk_rcvtimeo, optval, optlen);
543 ret = sock_set_timeout(&sk->sk_sndtimeo, optval, optlen);
546 #ifdef CONFIG_NETDEVICES
547 case SO_BINDTODEVICE:
549 char devname[IFNAMSIZ];
552 if (!capable(CAP_NET_RAW)) {
557 /* Bind this socket to a particular device like "eth0",
558 * as specified in the passed interface name. If the
559 * name is "" or the option length is zero the socket
564 sk->sk_bound_dev_if = 0;
566 if (optlen > IFNAMSIZ - 1)
567 optlen = IFNAMSIZ - 1;
568 memset(devname, 0, sizeof(devname));
569 if (copy_from_user(devname, optval, optlen)) {
574 /* Remove any cached route for this socket. */
577 if (devname[0] == '\0') {
578 sk->sk_bound_dev_if = 0;
580 struct net_device *dev = dev_get_by_name(devname);
585 sk->sk_bound_dev_if = dev->ifindex;
594 case SO_ATTACH_FILTER:
596 if (optlen == sizeof(struct sock_fprog)) {
597 struct sock_fprog fprog;
600 if (copy_from_user(&fprog, optval, sizeof(fprog)))
603 ret = sk_attach_filter(&fprog, sk);
607 case SO_DETACH_FILTER:
609 filter = rcu_dereference(sk->sk_filter);
611 rcu_assign_pointer(sk->sk_filter, NULL);
612 sk_filter_release(sk, filter);
613 rcu_read_unlock_bh();
616 rcu_read_unlock_bh();
622 set_bit(SOCK_PASSSEC, &sock->flags);
624 clear_bit(SOCK_PASSSEC, &sock->flags);
627 /* We implement the SO_SNDLOWAT etc to
628 not be settable (1003.1g 5.3) */
638 int sock_getsockopt(struct socket *sock, int level, int optname,
639 char __user *optval, int __user *optlen)
641 struct sock *sk = sock->sk;
650 unsigned int lv = sizeof(int);
653 if(get_user(len,optlen))
661 v.val = sock_flag(sk, SOCK_DBG);
665 v.val = sock_flag(sk, SOCK_LOCALROUTE);
669 v.val = !!sock_flag(sk, SOCK_BROADCAST);
673 v.val = sk->sk_sndbuf;
677 v.val = sk->sk_rcvbuf;
681 v.val = sk->sk_reuse;
685 v.val = !!sock_flag(sk, SOCK_KEEPOPEN);
693 v.val = -sock_error(sk);
695 v.val = xchg(&sk->sk_err_soft, 0);
699 v.val = !!sock_flag(sk, SOCK_URGINLINE);
703 v.val = sk->sk_no_check;
707 v.val = sk->sk_priority;
712 v.ling.l_onoff = !!sock_flag(sk, SOCK_LINGER);
713 v.ling.l_linger = sk->sk_lingertime / HZ;
717 sock_warn_obsolete_bsdism("getsockopt");
721 v.val = sock_flag(sk, SOCK_RCVTSTAMP);
725 lv=sizeof(struct timeval);
726 if (sk->sk_rcvtimeo == MAX_SCHEDULE_TIMEOUT) {
730 v.tm.tv_sec = sk->sk_rcvtimeo / HZ;
731 v.tm.tv_usec = ((sk->sk_rcvtimeo % HZ) * 1000000) / HZ;
736 lv=sizeof(struct timeval);
737 if (sk->sk_sndtimeo == MAX_SCHEDULE_TIMEOUT) {
741 v.tm.tv_sec = sk->sk_sndtimeo / HZ;
742 v.tm.tv_usec = ((sk->sk_sndtimeo % HZ) * 1000000) / HZ;
747 v.val = sk->sk_rcvlowat;
755 v.val = test_bit(SOCK_PASSCRED, &sock->flags) ? 1 : 0;
759 if (len > sizeof(sk->sk_peercred))
760 len = sizeof(sk->sk_peercred);
761 if (copy_to_user(optval, &sk->sk_peercred, len))
769 if (sock->ops->getname(sock, (struct sockaddr *)address, &lv, 2))
773 if (copy_to_user(optval, address, len))
778 /* Dubious BSD thing... Probably nobody even uses it, but
779 * the UNIX standard wants it for whatever reason... -DaveM
782 v.val = sk->sk_state == TCP_LISTEN;
786 v.val = test_bit(SOCK_PASSSEC, &sock->flags) ? 1 : 0;
790 return security_socket_getpeersec_stream(sock, optval, optlen, len);
793 return(-ENOPROTOOPT);
797 if (copy_to_user(optval, &v, len))
800 if (put_user(len, optlen))
806 * Initialize an sk_lock.
808 * (We also register the sk_lock with the lock validator.)
810 static void inline sock_lock_init(struct sock *sk)
812 spin_lock_init(&sk->sk_lock.slock);
813 sk->sk_lock.owner = NULL;
814 init_waitqueue_head(&sk->sk_lock.wq);
816 * Make sure we are not reinitializing a held lock:
818 debug_check_no_locks_freed((void *)&sk->sk_lock, sizeof(sk->sk_lock));
821 * Mark both the sk_lock and the sk_lock.slock as a
822 * per-address-family lock class:
824 lockdep_set_class_and_name(&sk->sk_lock.slock,
825 af_family_slock_keys + sk->sk_family,
826 af_family_slock_key_strings[sk->sk_family]);
827 lockdep_init_map(&sk->sk_lock.dep_map,
828 af_family_key_strings[sk->sk_family],
829 af_family_keys + sk->sk_family, 0);
833 * sk_alloc - All socket objects are allocated here
834 * @family: protocol family
835 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
836 * @prot: struct proto associated with this new sock instance
837 * @zero_it: if we should zero the newly allocated sock
839 struct sock *sk_alloc(int family, gfp_t priority,
840 struct proto *prot, int zero_it)
842 struct sock *sk = NULL;
843 kmem_cache_t *slab = prot->slab;
846 sk = kmem_cache_alloc(slab, priority);
848 sk = kmalloc(prot->obj_size, priority);
852 memset(sk, 0, prot->obj_size);
853 sk->sk_family = family;
855 * See comment in struct sock definition to understand
856 * why we need sk_prot_creator -acme
858 sk->sk_prot = sk->sk_prot_creator = prot;
862 if (security_sk_alloc(sk, family, priority))
865 if (!try_module_get(prot->owner))
872 kmem_cache_free(slab, sk);
878 void sk_free(struct sock *sk)
880 struct sk_filter *filter;
881 struct module *owner = sk->sk_prot_creator->owner;
886 filter = rcu_dereference(sk->sk_filter);
888 sk_filter_release(sk, filter);
889 rcu_assign_pointer(sk->sk_filter, NULL);
892 sock_disable_timestamp(sk);
894 if (atomic_read(&sk->sk_omem_alloc))
895 printk(KERN_DEBUG "%s: optmem leakage (%d bytes) detected.\n",
896 __FUNCTION__, atomic_read(&sk->sk_omem_alloc));
898 security_sk_free(sk);
899 if (sk->sk_prot_creator->slab != NULL)
900 kmem_cache_free(sk->sk_prot_creator->slab, sk);
906 struct sock *sk_clone(const struct sock *sk, const gfp_t priority)
908 struct sock *newsk = sk_alloc(sk->sk_family, priority, sk->sk_prot, 0);
911 struct sk_filter *filter;
913 sock_copy(newsk, sk);
916 sk_node_init(&newsk->sk_node);
917 sock_lock_init(newsk);
920 atomic_set(&newsk->sk_rmem_alloc, 0);
921 atomic_set(&newsk->sk_wmem_alloc, 0);
922 atomic_set(&newsk->sk_omem_alloc, 0);
923 skb_queue_head_init(&newsk->sk_receive_queue);
924 skb_queue_head_init(&newsk->sk_write_queue);
925 #ifdef CONFIG_NET_DMA
926 skb_queue_head_init(&newsk->sk_async_wait_queue);
929 rwlock_init(&newsk->sk_dst_lock);
930 rwlock_init(&newsk->sk_callback_lock);
931 lockdep_set_class(&newsk->sk_callback_lock,
932 af_callback_keys + newsk->sk_family);
934 newsk->sk_dst_cache = NULL;
935 newsk->sk_wmem_queued = 0;
936 newsk->sk_forward_alloc = 0;
937 newsk->sk_send_head = NULL;
938 newsk->sk_backlog.head = newsk->sk_backlog.tail = NULL;
939 newsk->sk_userlocks = sk->sk_userlocks & ~SOCK_BINDPORT_LOCK;
941 sock_reset_flag(newsk, SOCK_DONE);
942 skb_queue_head_init(&newsk->sk_error_queue);
944 filter = newsk->sk_filter;
946 sk_filter_charge(newsk, filter);
948 if (unlikely(xfrm_sk_clone_policy(newsk))) {
949 /* It is still raw copy of parent, so invalidate
950 * destructor and make plain sk_free() */
951 newsk->sk_destruct = NULL;
958 newsk->sk_priority = 0;
959 atomic_set(&newsk->sk_refcnt, 2);
962 * Increment the counter in the same struct proto as the master
963 * sock (sk_refcnt_debug_inc uses newsk->sk_prot->socks, that
964 * is the same as sk->sk_prot->socks, as this field was copied
967 * This _changes_ the previous behaviour, where
968 * tcp_create_openreq_child always was incrementing the
969 * equivalent to tcp_prot->socks (inet_sock_nr), so this have
970 * to be taken into account in all callers. -acme
972 sk_refcnt_debug_inc(newsk);
973 newsk->sk_socket = NULL;
974 newsk->sk_sleep = NULL;
976 if (newsk->sk_prot->sockets_allocated)
977 atomic_inc(newsk->sk_prot->sockets_allocated);
983 EXPORT_SYMBOL_GPL(sk_clone);
985 void __init sk_init(void)
987 if (num_physpages <= 4096) {
988 sysctl_wmem_max = 32767;
989 sysctl_rmem_max = 32767;
990 sysctl_wmem_default = 32767;
991 sysctl_rmem_default = 32767;
992 } else if (num_physpages >= 131072) {
993 sysctl_wmem_max = 131071;
994 sysctl_rmem_max = 131071;
999 * Simple resource managers for sockets.
1004 * Write buffer destructor automatically called from kfree_skb.
1006 void sock_wfree(struct sk_buff *skb)
1008 struct sock *sk = skb->sk;
1010 /* In case it might be waiting for more memory. */
1011 atomic_sub(skb->truesize, &sk->sk_wmem_alloc);
1012 if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE))
1013 sk->sk_write_space(sk);
1018 * Read buffer destructor automatically called from kfree_skb.
1020 void sock_rfree(struct sk_buff *skb)
1022 struct sock *sk = skb->sk;
1024 atomic_sub(skb->truesize, &sk->sk_rmem_alloc);
1028 int sock_i_uid(struct sock *sk)
1032 read_lock(&sk->sk_callback_lock);
1033 uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : 0;
1034 read_unlock(&sk->sk_callback_lock);
1038 unsigned long sock_i_ino(struct sock *sk)
1042 read_lock(&sk->sk_callback_lock);
1043 ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0;
1044 read_unlock(&sk->sk_callback_lock);
1049 * Allocate a skb from the socket's send buffer.
1051 struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force,
1054 if (force || atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
1055 struct sk_buff * skb = alloc_skb(size, priority);
1057 skb_set_owner_w(skb, sk);
1065 * Allocate a skb from the socket's receive buffer.
1067 struct sk_buff *sock_rmalloc(struct sock *sk, unsigned long size, int force,
1070 if (force || atomic_read(&sk->sk_rmem_alloc) < sk->sk_rcvbuf) {
1071 struct sk_buff *skb = alloc_skb(size, priority);
1073 skb_set_owner_r(skb, sk);
1081 * Allocate a memory block from the socket's option memory buffer.
1083 void *sock_kmalloc(struct sock *sk, int size, gfp_t priority)
1085 if ((unsigned)size <= sysctl_optmem_max &&
1086 atomic_read(&sk->sk_omem_alloc) + size < sysctl_optmem_max) {
1088 /* First do the add, to avoid the race if kmalloc
1091 atomic_add(size, &sk->sk_omem_alloc);
1092 mem = kmalloc(size, priority);
1095 atomic_sub(size, &sk->sk_omem_alloc);
1101 * Free an option memory block.
1103 void sock_kfree_s(struct sock *sk, void *mem, int size)
1106 atomic_sub(size, &sk->sk_omem_alloc);
1109 /* It is almost wait_for_tcp_memory minus release_sock/lock_sock.
1110 I think, these locks should be removed for datagram sockets.
1112 static long sock_wait_for_wmem(struct sock * sk, long timeo)
1116 clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1120 if (signal_pending(current))
1122 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1123 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
1124 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf)
1126 if (sk->sk_shutdown & SEND_SHUTDOWN)
1130 timeo = schedule_timeout(timeo);
1132 finish_wait(sk->sk_sleep, &wait);
1138 * Generic send/receive buffer handlers
1141 static struct sk_buff *sock_alloc_send_pskb(struct sock *sk,
1142 unsigned long header_len,
1143 unsigned long data_len,
1144 int noblock, int *errcode)
1146 struct sk_buff *skb;
1151 gfp_mask = sk->sk_allocation;
1152 if (gfp_mask & __GFP_WAIT)
1153 gfp_mask |= __GFP_REPEAT;
1155 timeo = sock_sndtimeo(sk, noblock);
1157 err = sock_error(sk);
1162 if (sk->sk_shutdown & SEND_SHUTDOWN)
1165 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
1166 skb = alloc_skb(header_len, gfp_mask);
1171 /* No pages, we're done... */
1175 npages = (data_len + (PAGE_SIZE - 1)) >> PAGE_SHIFT;
1176 skb->truesize += data_len;
1177 skb_shinfo(skb)->nr_frags = npages;
1178 for (i = 0; i < npages; i++) {
1182 page = alloc_pages(sk->sk_allocation, 0);
1185 skb_shinfo(skb)->nr_frags = i;
1190 frag = &skb_shinfo(skb)->frags[i];
1192 frag->page_offset = 0;
1193 frag->size = (data_len >= PAGE_SIZE ?
1196 data_len -= PAGE_SIZE;
1199 /* Full success... */
1205 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1206 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1210 if (signal_pending(current))
1212 timeo = sock_wait_for_wmem(sk, timeo);
1215 skb_set_owner_w(skb, sk);
1219 err = sock_intr_errno(timeo);
1225 struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size,
1226 int noblock, int *errcode)
1228 return sock_alloc_send_pskb(sk, size, 0, noblock, errcode);
1231 static void __lock_sock(struct sock *sk)
1236 prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait,
1237 TASK_UNINTERRUPTIBLE);
1238 spin_unlock_bh(&sk->sk_lock.slock);
1240 spin_lock_bh(&sk->sk_lock.slock);
1241 if(!sock_owned_by_user(sk))
1244 finish_wait(&sk->sk_lock.wq, &wait);
1247 static void __release_sock(struct sock *sk)
1249 struct sk_buff *skb = sk->sk_backlog.head;
1252 sk->sk_backlog.head = sk->sk_backlog.tail = NULL;
1256 struct sk_buff *next = skb->next;
1259 sk->sk_backlog_rcv(sk, skb);
1262 * We are in process context here with softirqs
1263 * disabled, use cond_resched_softirq() to preempt.
1264 * This is safe to do because we've taken the backlog
1267 cond_resched_softirq();
1270 } while (skb != NULL);
1273 } while((skb = sk->sk_backlog.head) != NULL);
1277 * sk_wait_data - wait for data to arrive at sk_receive_queue
1278 * @sk: sock to wait on
1279 * @timeo: for how long
1281 * Now socket state including sk->sk_err is changed only under lock,
1282 * hence we may omit checks after joining wait queue.
1283 * We check receive queue before schedule() only as optimization;
1284 * it is very likely that release_sock() added new data.
1286 int sk_wait_data(struct sock *sk, long *timeo)
1291 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
1292 set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
1293 rc = sk_wait_event(sk, timeo, !skb_queue_empty(&sk->sk_receive_queue));
1294 clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
1295 finish_wait(sk->sk_sleep, &wait);
1299 EXPORT_SYMBOL(sk_wait_data);
1302 * Set of default routines for initialising struct proto_ops when
1303 * the protocol does not support a particular function. In certain
1304 * cases where it makes no sense for a protocol to have a "do nothing"
1305 * function, some default processing is provided.
1308 int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len)
1313 int sock_no_connect(struct socket *sock, struct sockaddr *saddr,
1319 int sock_no_socketpair(struct socket *sock1, struct socket *sock2)
1324 int sock_no_accept(struct socket *sock, struct socket *newsock, int flags)
1329 int sock_no_getname(struct socket *sock, struct sockaddr *saddr,
1335 unsigned int sock_no_poll(struct file * file, struct socket *sock, poll_table *pt)
1340 int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1345 int sock_no_listen(struct socket *sock, int backlog)
1350 int sock_no_shutdown(struct socket *sock, int how)
1355 int sock_no_setsockopt(struct socket *sock, int level, int optname,
1356 char __user *optval, int optlen)
1361 int sock_no_getsockopt(struct socket *sock, int level, int optname,
1362 char __user *optval, int __user *optlen)
1367 int sock_no_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
1373 int sock_no_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
1374 size_t len, int flags)
1379 int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma)
1381 /* Mirror missing mmap method error code */
1385 ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags)
1388 struct msghdr msg = {.msg_flags = flags};
1390 char *kaddr = kmap(page);
1391 iov.iov_base = kaddr + offset;
1393 res = kernel_sendmsg(sock, &msg, &iov, 1, size);
1399 * Default Socket Callbacks
1402 static void sock_def_wakeup(struct sock *sk)
1404 read_lock(&sk->sk_callback_lock);
1405 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
1406 wake_up_interruptible_all(sk->sk_sleep);
1407 read_unlock(&sk->sk_callback_lock);
1410 static void sock_def_error_report(struct sock *sk)
1412 read_lock(&sk->sk_callback_lock);
1413 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
1414 wake_up_interruptible(sk->sk_sleep);
1415 sk_wake_async(sk,0,POLL_ERR);
1416 read_unlock(&sk->sk_callback_lock);
1419 static void sock_def_readable(struct sock *sk, int len)
1421 read_lock(&sk->sk_callback_lock);
1422 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
1423 wake_up_interruptible(sk->sk_sleep);
1424 sk_wake_async(sk,1,POLL_IN);
1425 read_unlock(&sk->sk_callback_lock);
1428 static void sock_def_write_space(struct sock *sk)
1430 read_lock(&sk->sk_callback_lock);
1432 /* Do not wake up a writer until he can make "significant"
1435 if((atomic_read(&sk->sk_wmem_alloc) << 1) <= sk->sk_sndbuf) {
1436 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
1437 wake_up_interruptible(sk->sk_sleep);
1439 /* Should agree with poll, otherwise some programs break */
1440 if (sock_writeable(sk))
1441 sk_wake_async(sk, 2, POLL_OUT);
1444 read_unlock(&sk->sk_callback_lock);
1447 static void sock_def_destruct(struct sock *sk)
1449 kfree(sk->sk_protinfo);
1452 void sk_send_sigurg(struct sock *sk)
1454 if (sk->sk_socket && sk->sk_socket->file)
1455 if (send_sigurg(&sk->sk_socket->file->f_owner))
1456 sk_wake_async(sk, 3, POLL_PRI);
1459 void sk_reset_timer(struct sock *sk, struct timer_list* timer,
1460 unsigned long expires)
1462 if (!mod_timer(timer, expires))
1466 EXPORT_SYMBOL(sk_reset_timer);
1468 void sk_stop_timer(struct sock *sk, struct timer_list* timer)
1470 if (timer_pending(timer) && del_timer(timer))
1474 EXPORT_SYMBOL(sk_stop_timer);
1476 void sock_init_data(struct socket *sock, struct sock *sk)
1478 skb_queue_head_init(&sk->sk_receive_queue);
1479 skb_queue_head_init(&sk->sk_write_queue);
1480 skb_queue_head_init(&sk->sk_error_queue);
1481 #ifdef CONFIG_NET_DMA
1482 skb_queue_head_init(&sk->sk_async_wait_queue);
1485 sk->sk_send_head = NULL;
1487 init_timer(&sk->sk_timer);
1489 sk->sk_allocation = GFP_KERNEL;
1490 sk->sk_rcvbuf = sysctl_rmem_default;
1491 sk->sk_sndbuf = sysctl_wmem_default;
1492 sk->sk_state = TCP_CLOSE;
1493 sk->sk_socket = sock;
1495 sock_set_flag(sk, SOCK_ZAPPED);
1499 sk->sk_type = sock->type;
1500 sk->sk_sleep = &sock->wait;
1503 sk->sk_sleep = NULL;
1505 rwlock_init(&sk->sk_dst_lock);
1506 rwlock_init(&sk->sk_callback_lock);
1507 lockdep_set_class(&sk->sk_callback_lock,
1508 af_callback_keys + sk->sk_family);
1510 sk->sk_state_change = sock_def_wakeup;
1511 sk->sk_data_ready = sock_def_readable;
1512 sk->sk_write_space = sock_def_write_space;
1513 sk->sk_error_report = sock_def_error_report;
1514 sk->sk_destruct = sock_def_destruct;
1516 sk->sk_sndmsg_page = NULL;
1517 sk->sk_sndmsg_off = 0;
1519 sk->sk_peercred.pid = 0;
1520 sk->sk_peercred.uid = -1;
1521 sk->sk_peercred.gid = -1;
1522 sk->sk_write_pending = 0;
1523 sk->sk_rcvlowat = 1;
1524 sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT;
1525 sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT;
1527 sk->sk_stamp.tv_sec = -1L;
1528 sk->sk_stamp.tv_usec = -1L;
1530 atomic_set(&sk->sk_refcnt, 1);
1533 void fastcall lock_sock_nested(struct sock *sk, int subclass)
1536 spin_lock_bh(&sk->sk_lock.slock);
1537 if (sk->sk_lock.owner)
1539 sk->sk_lock.owner = (void *)1;
1540 spin_unlock(&sk->sk_lock.slock);
1542 * The sk_lock has mutex_lock() semantics here:
1544 mutex_acquire(&sk->sk_lock.dep_map, subclass, 0, _RET_IP_);
1548 EXPORT_SYMBOL(lock_sock_nested);
1550 void fastcall release_sock(struct sock *sk)
1553 * The sk_lock has mutex_unlock() semantics:
1555 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_);
1557 spin_lock_bh(&sk->sk_lock.slock);
1558 if (sk->sk_backlog.tail)
1560 sk->sk_lock.owner = NULL;
1561 if (waitqueue_active(&sk->sk_lock.wq))
1562 wake_up(&sk->sk_lock.wq);
1563 spin_unlock_bh(&sk->sk_lock.slock);
1565 EXPORT_SYMBOL(release_sock);
1567 int sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp)
1569 if (!sock_flag(sk, SOCK_TIMESTAMP))
1570 sock_enable_timestamp(sk);
1571 if (sk->sk_stamp.tv_sec == -1)
1573 if (sk->sk_stamp.tv_sec == 0)
1574 do_gettimeofday(&sk->sk_stamp);
1575 return copy_to_user(userstamp, &sk->sk_stamp, sizeof(struct timeval)) ?
1578 EXPORT_SYMBOL(sock_get_timestamp);
1580 void sock_enable_timestamp(struct sock *sk)
1582 if (!sock_flag(sk, SOCK_TIMESTAMP)) {
1583 sock_set_flag(sk, SOCK_TIMESTAMP);
1584 net_enable_timestamp();
1587 EXPORT_SYMBOL(sock_enable_timestamp);
1590 * Get a socket option on an socket.
1592 * FIX: POSIX 1003.1g is very ambiguous here. It states that
1593 * asynchronous errors should be reported by getsockopt. We assume
1594 * this means if you specify SO_ERROR (otherwise whats the point of it).
1596 int sock_common_getsockopt(struct socket *sock, int level, int optname,
1597 char __user *optval, int __user *optlen)
1599 struct sock *sk = sock->sk;
1601 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
1604 EXPORT_SYMBOL(sock_common_getsockopt);
1606 #ifdef CONFIG_COMPAT
1607 int compat_sock_common_getsockopt(struct socket *sock, int level, int optname,
1608 char __user *optval, int __user *optlen)
1610 struct sock *sk = sock->sk;
1612 if (sk->sk_prot->compat_setsockopt != NULL)
1613 return sk->sk_prot->compat_getsockopt(sk, level, optname,
1615 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
1617 EXPORT_SYMBOL(compat_sock_common_getsockopt);
1620 int sock_common_recvmsg(struct kiocb *iocb, struct socket *sock,
1621 struct msghdr *msg, size_t size, int flags)
1623 struct sock *sk = sock->sk;
1627 err = sk->sk_prot->recvmsg(iocb, sk, msg, size, flags & MSG_DONTWAIT,
1628 flags & ~MSG_DONTWAIT, &addr_len);
1630 msg->msg_namelen = addr_len;
1634 EXPORT_SYMBOL(sock_common_recvmsg);
1637 * Set socket options on an inet socket.
1639 int sock_common_setsockopt(struct socket *sock, int level, int optname,
1640 char __user *optval, int optlen)
1642 struct sock *sk = sock->sk;
1644 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
1647 EXPORT_SYMBOL(sock_common_setsockopt);
1649 #ifdef CONFIG_COMPAT
1650 int compat_sock_common_setsockopt(struct socket *sock, int level, int optname,
1651 char __user *optval, int optlen)
1653 struct sock *sk = sock->sk;
1655 if (sk->sk_prot->compat_setsockopt != NULL)
1656 return sk->sk_prot->compat_setsockopt(sk, level, optname,
1658 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
1660 EXPORT_SYMBOL(compat_sock_common_setsockopt);
1663 void sk_common_release(struct sock *sk)
1665 if (sk->sk_prot->destroy)
1666 sk->sk_prot->destroy(sk);
1669 * Observation: when sock_common_release is called, processes have
1670 * no access to socket. But net still has.
1671 * Step one, detach it from networking:
1673 * A. Remove from hash tables.
1676 sk->sk_prot->unhash(sk);
1679 * In this point socket cannot receive new packets, but it is possible
1680 * that some packets are in flight because some CPU runs receiver and
1681 * did hash table lookup before we unhashed socket. They will achieve
1682 * receive queue and will be purged by socket destructor.
1684 * Also we still have packets pending on receive queue and probably,
1685 * our own packets waiting in device queues. sock_destroy will drain
1686 * receive queue, but transmitted packets will delay socket destruction
1687 * until the last reference will be released.
1692 xfrm_sk_free_policy(sk);
1694 sk_refcnt_debug_release(sk);
1698 EXPORT_SYMBOL(sk_common_release);
1700 static DEFINE_RWLOCK(proto_list_lock);
1701 static LIST_HEAD(proto_list);
1703 int proto_register(struct proto *prot, int alloc_slab)
1705 char *request_sock_slab_name = NULL;
1706 char *timewait_sock_slab_name;
1710 prot->slab = kmem_cache_create(prot->name, prot->obj_size, 0,
1711 SLAB_HWCACHE_ALIGN, NULL, NULL);
1713 if (prot->slab == NULL) {
1714 printk(KERN_CRIT "%s: Can't create sock SLAB cache!\n",
1719 if (prot->rsk_prot != NULL) {
1720 static const char mask[] = "request_sock_%s";
1722 request_sock_slab_name = kmalloc(strlen(prot->name) + sizeof(mask) - 1, GFP_KERNEL);
1723 if (request_sock_slab_name == NULL)
1724 goto out_free_sock_slab;
1726 sprintf(request_sock_slab_name, mask, prot->name);
1727 prot->rsk_prot->slab = kmem_cache_create(request_sock_slab_name,
1728 prot->rsk_prot->obj_size, 0,
1729 SLAB_HWCACHE_ALIGN, NULL, NULL);
1731 if (prot->rsk_prot->slab == NULL) {
1732 printk(KERN_CRIT "%s: Can't create request sock SLAB cache!\n",
1734 goto out_free_request_sock_slab_name;
1738 if (prot->twsk_prot != NULL) {
1739 static const char mask[] = "tw_sock_%s";
1741 timewait_sock_slab_name = kmalloc(strlen(prot->name) + sizeof(mask) - 1, GFP_KERNEL);
1743 if (timewait_sock_slab_name == NULL)
1744 goto out_free_request_sock_slab;
1746 sprintf(timewait_sock_slab_name, mask, prot->name);
1747 prot->twsk_prot->twsk_slab =
1748 kmem_cache_create(timewait_sock_slab_name,
1749 prot->twsk_prot->twsk_obj_size,
1750 0, SLAB_HWCACHE_ALIGN,
1752 if (prot->twsk_prot->twsk_slab == NULL)
1753 goto out_free_timewait_sock_slab_name;
1757 write_lock(&proto_list_lock);
1758 list_add(&prot->node, &proto_list);
1759 write_unlock(&proto_list_lock);
1763 out_free_timewait_sock_slab_name:
1764 kfree(timewait_sock_slab_name);
1765 out_free_request_sock_slab:
1766 if (prot->rsk_prot && prot->rsk_prot->slab) {
1767 kmem_cache_destroy(prot->rsk_prot->slab);
1768 prot->rsk_prot->slab = NULL;
1770 out_free_request_sock_slab_name:
1771 kfree(request_sock_slab_name);
1773 kmem_cache_destroy(prot->slab);
1778 EXPORT_SYMBOL(proto_register);
1780 void proto_unregister(struct proto *prot)
1782 write_lock(&proto_list_lock);
1783 list_del(&prot->node);
1784 write_unlock(&proto_list_lock);
1786 if (prot->slab != NULL) {
1787 kmem_cache_destroy(prot->slab);
1791 if (prot->rsk_prot != NULL && prot->rsk_prot->slab != NULL) {
1792 const char *name = kmem_cache_name(prot->rsk_prot->slab);
1794 kmem_cache_destroy(prot->rsk_prot->slab);
1796 prot->rsk_prot->slab = NULL;
1799 if (prot->twsk_prot != NULL && prot->twsk_prot->twsk_slab != NULL) {
1800 const char *name = kmem_cache_name(prot->twsk_prot->twsk_slab);
1802 kmem_cache_destroy(prot->twsk_prot->twsk_slab);
1804 prot->twsk_prot->twsk_slab = NULL;
1808 EXPORT_SYMBOL(proto_unregister);
1810 #ifdef CONFIG_PROC_FS
1811 static inline struct proto *__proto_head(void)
1813 return list_entry(proto_list.next, struct proto, node);
1816 static inline struct proto *proto_head(void)
1818 return list_empty(&proto_list) ? NULL : __proto_head();
1821 static inline struct proto *proto_next(struct proto *proto)
1823 return proto->node.next == &proto_list ? NULL :
1824 list_entry(proto->node.next, struct proto, node);
1827 static inline struct proto *proto_get_idx(loff_t pos)
1829 struct proto *proto;
1832 list_for_each_entry(proto, &proto_list, node)
1841 static void *proto_seq_start(struct seq_file *seq, loff_t *pos)
1843 read_lock(&proto_list_lock);
1844 return *pos ? proto_get_idx(*pos - 1) : SEQ_START_TOKEN;
1847 static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1850 return v == SEQ_START_TOKEN ? proto_head() : proto_next(v);
1853 static void proto_seq_stop(struct seq_file *seq, void *v)
1855 read_unlock(&proto_list_lock);
1858 static char proto_method_implemented(const void *method)
1860 return method == NULL ? 'n' : 'y';
1863 static void proto_seq_printf(struct seq_file *seq, struct proto *proto)
1865 seq_printf(seq, "%-9s %4u %6d %6d %-3s %6u %-3s %-10s "
1866 "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n",
1869 proto->sockets_allocated != NULL ? atomic_read(proto->sockets_allocated) : -1,
1870 proto->memory_allocated != NULL ? atomic_read(proto->memory_allocated) : -1,
1871 proto->memory_pressure != NULL ? *proto->memory_pressure ? "yes" : "no" : "NI",
1873 proto->slab == NULL ? "no" : "yes",
1874 module_name(proto->owner),
1875 proto_method_implemented(proto->close),
1876 proto_method_implemented(proto->connect),
1877 proto_method_implemented(proto->disconnect),
1878 proto_method_implemented(proto->accept),
1879 proto_method_implemented(proto->ioctl),
1880 proto_method_implemented(proto->init),
1881 proto_method_implemented(proto->destroy),
1882 proto_method_implemented(proto->shutdown),
1883 proto_method_implemented(proto->setsockopt),
1884 proto_method_implemented(proto->getsockopt),
1885 proto_method_implemented(proto->sendmsg),
1886 proto_method_implemented(proto->recvmsg),
1887 proto_method_implemented(proto->sendpage),
1888 proto_method_implemented(proto->bind),
1889 proto_method_implemented(proto->backlog_rcv),
1890 proto_method_implemented(proto->hash),
1891 proto_method_implemented(proto->unhash),
1892 proto_method_implemented(proto->get_port),
1893 proto_method_implemented(proto->enter_memory_pressure));
1896 static int proto_seq_show(struct seq_file *seq, void *v)
1898 if (v == SEQ_START_TOKEN)
1899 seq_printf(seq, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s",
1908 "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n");
1910 proto_seq_printf(seq, v);
1914 static struct seq_operations proto_seq_ops = {
1915 .start = proto_seq_start,
1916 .next = proto_seq_next,
1917 .stop = proto_seq_stop,
1918 .show = proto_seq_show,
1921 static int proto_seq_open(struct inode *inode, struct file *file)
1923 return seq_open(file, &proto_seq_ops);
1926 static struct file_operations proto_seq_fops = {
1927 .owner = THIS_MODULE,
1928 .open = proto_seq_open,
1930 .llseek = seq_lseek,
1931 .release = seq_release,
1934 static int __init proto_init(void)
1936 /* register /proc/net/protocols */
1937 return proc_net_fops_create("protocols", S_IRUGO, &proto_seq_fops) == NULL ? -ENOBUFS : 0;
1940 subsys_initcall(proto_init);
1942 #endif /* PROC_FS */
1944 EXPORT_SYMBOL(sk_alloc);
1945 EXPORT_SYMBOL(sk_free);
1946 EXPORT_SYMBOL(sk_send_sigurg);
1947 EXPORT_SYMBOL(sock_alloc_send_skb);
1948 EXPORT_SYMBOL(sock_init_data);
1949 EXPORT_SYMBOL(sock_kfree_s);
1950 EXPORT_SYMBOL(sock_kmalloc);
1951 EXPORT_SYMBOL(sock_no_accept);
1952 EXPORT_SYMBOL(sock_no_bind);
1953 EXPORT_SYMBOL(sock_no_connect);
1954 EXPORT_SYMBOL(sock_no_getname);
1955 EXPORT_SYMBOL(sock_no_getsockopt);
1956 EXPORT_SYMBOL(sock_no_ioctl);
1957 EXPORT_SYMBOL(sock_no_listen);
1958 EXPORT_SYMBOL(sock_no_mmap);
1959 EXPORT_SYMBOL(sock_no_poll);
1960 EXPORT_SYMBOL(sock_no_recvmsg);
1961 EXPORT_SYMBOL(sock_no_sendmsg);
1962 EXPORT_SYMBOL(sock_no_sendpage);
1963 EXPORT_SYMBOL(sock_no_setsockopt);
1964 EXPORT_SYMBOL(sock_no_shutdown);
1965 EXPORT_SYMBOL(sock_no_socketpair);
1966 EXPORT_SYMBOL(sock_rfree);
1967 EXPORT_SYMBOL(sock_setsockopt);
1968 EXPORT_SYMBOL(sock_wfree);
1969 EXPORT_SYMBOL(sock_wmalloc);
1970 EXPORT_SYMBOL(sock_i_uid);
1971 EXPORT_SYMBOL(sock_i_ino);
1972 EXPORT_SYMBOL(sysctl_optmem_max);
1973 #ifdef CONFIG_SYSCTL
1974 EXPORT_SYMBOL(sysctl_rmem_max);
1975 EXPORT_SYMBOL(sysctl_wmem_max);