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>
127 #include <linux/vs_socket.h>
128 #include <linux/vs_limit.h>
129 #include <linux/vs_context.h>
136 * Each address family might have different locking rules, so we have
137 * one slock key per address family:
139 static struct lock_class_key af_family_keys[AF_MAX];
140 static struct lock_class_key af_family_slock_keys[AF_MAX];
142 #ifdef CONFIG_DEBUG_LOCK_ALLOC
144 * Make lock validator output more readable. (we pre-construct these
145 * strings build-time, so that runtime initialization of socket
148 static const char *af_family_key_strings[AF_MAX+1] = {
149 "sk_lock-AF_UNSPEC", "sk_lock-AF_UNIX" , "sk_lock-AF_INET" ,
150 "sk_lock-AF_AX25" , "sk_lock-AF_IPX" , "sk_lock-AF_APPLETALK",
151 "sk_lock-AF_NETROM", "sk_lock-AF_BRIDGE" , "sk_lock-AF_ATMPVC" ,
152 "sk_lock-AF_X25" , "sk_lock-AF_INET6" , "sk_lock-AF_ROSE" ,
153 "sk_lock-AF_DECnet", "sk_lock-AF_NETBEUI" , "sk_lock-AF_SECURITY" ,
154 "sk_lock-AF_KEY" , "sk_lock-AF_NETLINK" , "sk_lock-AF_PACKET" ,
155 "sk_lock-AF_ASH" , "sk_lock-AF_ECONET" , "sk_lock-AF_ATMSVC" ,
156 "sk_lock-21" , "sk_lock-AF_SNA" , "sk_lock-AF_IRDA" ,
157 "sk_lock-AF_PPPOX" , "sk_lock-AF_WANPIPE" , "sk_lock-AF_LLC" ,
158 "sk_lock-27" , "sk_lock-28" , "sk_lock-29" ,
159 "sk_lock-AF_TIPC" , "sk_lock-AF_BLUETOOTH", "sk_lock-AF_MAX"
161 static const char *af_family_slock_key_strings[AF_MAX+1] = {
162 "slock-AF_UNSPEC", "slock-AF_UNIX" , "slock-AF_INET" ,
163 "slock-AF_AX25" , "slock-AF_IPX" , "slock-AF_APPLETALK",
164 "slock-AF_NETROM", "slock-AF_BRIDGE" , "slock-AF_ATMPVC" ,
165 "slock-AF_X25" , "slock-AF_INET6" , "slock-AF_ROSE" ,
166 "slock-AF_DECnet", "slock-AF_NETBEUI" , "slock-AF_SECURITY" ,
167 "slock-AF_KEY" , "slock-AF_NETLINK" , "slock-AF_PACKET" ,
168 "slock-AF_ASH" , "slock-AF_ECONET" , "slock-AF_ATMSVC" ,
169 "slock-21" , "slock-AF_SNA" , "slock-AF_IRDA" ,
170 "slock-AF_PPPOX" , "slock-AF_WANPIPE" , "slock-AF_LLC" ,
171 "slock-27" , "slock-28" , "slock-29" ,
172 "slock-AF_TIPC" , "slock-AF_BLUETOOTH", "slock-AF_MAX"
177 * sk_callback_lock locking rules are per-address-family,
178 * so split the lock classes by using a per-AF key:
180 static struct lock_class_key af_callback_keys[AF_MAX];
182 /* Take into consideration the size of the struct sk_buff overhead in the
183 * determination of these values, since that is non-constant across
184 * platforms. This makes socket queueing behavior and performance
185 * not depend upon such differences.
187 #define _SK_MEM_PACKETS 256
188 #define _SK_MEM_OVERHEAD (sizeof(struct sk_buff) + 256)
189 #define SK_WMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS)
190 #define SK_RMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS)
192 /* Run time adjustable parameters. */
193 __u32 sysctl_wmem_max = SK_WMEM_MAX;
194 __u32 sysctl_rmem_max = SK_RMEM_MAX;
195 __u32 sysctl_wmem_default = SK_WMEM_MAX;
196 __u32 sysctl_rmem_default = SK_RMEM_MAX;
198 /* Maximal space eaten by iovec or ancilliary data plus some space */
199 int sysctl_optmem_max = sizeof(unsigned long)*(2*UIO_MAXIOV + 512);
201 static int sock_set_timeout(long *timeo_p, char __user *optval, int optlen)
205 if (optlen < sizeof(tv))
207 if (copy_from_user(&tv, optval, sizeof(tv)))
210 *timeo_p = MAX_SCHEDULE_TIMEOUT;
211 if (tv.tv_sec == 0 && tv.tv_usec == 0)
213 if (tv.tv_sec < (MAX_SCHEDULE_TIMEOUT/HZ - 1))
214 *timeo_p = tv.tv_sec*HZ + (tv.tv_usec+(1000000/HZ-1))/(1000000/HZ);
218 static void sock_warn_obsolete_bsdism(const char *name)
221 static char warncomm[TASK_COMM_LEN];
222 if (strcmp(warncomm, current->comm) && warned < 5) {
223 strcpy(warncomm, current->comm);
224 printk(KERN_WARNING "process `%s' is using obsolete "
225 "%s SO_BSDCOMPAT\n", warncomm, name);
230 static void sock_disable_timestamp(struct sock *sk)
232 if (sock_flag(sk, SOCK_TIMESTAMP)) {
233 sock_reset_flag(sk, SOCK_TIMESTAMP);
234 net_disable_timestamp();
239 int sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
244 /* Cast skb->rcvbuf to unsigned... It's pointless, but reduces
245 number of warnings when compiling with -W --ANK
247 if (atomic_read(&sk->sk_rmem_alloc) + skb->truesize >=
248 (unsigned)sk->sk_rcvbuf) {
253 /* It would be deadlock, if sock_queue_rcv_skb is used
254 with socket lock! We assume that users of this
255 function are lock free.
257 err = sk_filter(sk, skb, 1);
262 skb_set_owner_r(skb, sk);
264 /* Cache the SKB length before we tack it onto the receive
265 * queue. Once it is added it no longer belongs to us and
266 * may be freed by other threads of control pulling packets
271 skb_queue_tail(&sk->sk_receive_queue, skb);
273 if (!sock_flag(sk, SOCK_DEAD))
274 sk->sk_data_ready(sk, skb_len);
278 EXPORT_SYMBOL(sock_queue_rcv_skb);
280 int sk_receive_skb(struct sock *sk, struct sk_buff *skb)
282 int rc = NET_RX_SUCCESS;
284 if (sk_filter(sk, skb, 0))
285 goto discard_and_relse;
290 if (!sock_owned_by_user(sk)) {
292 * trylock + unlock semantics:
294 mutex_acquire(&sk->sk_lock.dep_map, 0, 1, _RET_IP_);
296 rc = sk->sk_backlog_rcv(sk, skb);
298 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_);
300 sk_add_backlog(sk, skb);
309 EXPORT_SYMBOL(sk_receive_skb);
311 struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie)
313 struct dst_entry *dst = sk->sk_dst_cache;
315 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
316 sk->sk_dst_cache = NULL;
323 EXPORT_SYMBOL(__sk_dst_check);
325 struct dst_entry *sk_dst_check(struct sock *sk, u32 cookie)
327 struct dst_entry *dst = sk_dst_get(sk);
329 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
337 EXPORT_SYMBOL(sk_dst_check);
340 * This is meant for all protocols to use and covers goings on
341 * at the socket level. Everything here is generic.
344 int sock_setsockopt(struct socket *sock, int level, int optname,
345 char __user *optval, int optlen)
347 struct sock *sk=sock->sk;
348 struct sk_filter *filter;
355 * Options without arguments
358 #ifdef SO_DONTLINGER /* Compatibility item... */
359 if (optname == SO_DONTLINGER) {
361 sock_reset_flag(sk, SOCK_LINGER);
367 if(optlen<sizeof(int))
370 if (get_user(val, (int __user *)optval))
380 if(val && !capable(CAP_NET_ADMIN))
385 sock_set_flag(sk, SOCK_DBG);
387 sock_reset_flag(sk, SOCK_DBG);
390 sk->sk_reuse = valbool;
398 sock_set_flag(sk, SOCK_LOCALROUTE);
400 sock_reset_flag(sk, SOCK_LOCALROUTE);
403 sock_valbool_flag(sk, SOCK_BROADCAST, valbool);
406 /* Don't error on this BSD doesn't and if you think
407 about it this is right. Otherwise apps have to
408 play 'guess the biggest size' games. RCVBUF/SNDBUF
409 are treated in BSD as hints */
411 if (val > sysctl_wmem_max)
412 val = sysctl_wmem_max;
414 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
415 if ((val * 2) < SOCK_MIN_SNDBUF)
416 sk->sk_sndbuf = SOCK_MIN_SNDBUF;
418 sk->sk_sndbuf = val * 2;
421 * Wake up sending tasks if we
424 sk->sk_write_space(sk);
428 if (!capable(CAP_NET_ADMIN)) {
435 /* Don't error on this BSD doesn't and if you think
436 about it this is right. Otherwise apps have to
437 play 'guess the biggest size' games. RCVBUF/SNDBUF
438 are treated in BSD as hints */
440 if (val > sysctl_rmem_max)
441 val = sysctl_rmem_max;
443 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
445 * We double it on the way in to account for
446 * "struct sk_buff" etc. overhead. Applications
447 * assume that the SO_RCVBUF setting they make will
448 * allow that much actual data to be received on that
451 * Applications are unaware that "struct sk_buff" and
452 * other overheads allocate from the receive buffer
453 * during socket buffer allocation.
455 * And after considering the possible alternatives,
456 * returning the value we actually used in getsockopt
457 * is the most desirable behavior.
459 if ((val * 2) < SOCK_MIN_RCVBUF)
460 sk->sk_rcvbuf = SOCK_MIN_RCVBUF;
462 sk->sk_rcvbuf = val * 2;
466 if (!capable(CAP_NET_ADMIN)) {
474 if (sk->sk_protocol == IPPROTO_TCP)
475 tcp_set_keepalive(sk, valbool);
477 sock_valbool_flag(sk, SOCK_KEEPOPEN, valbool);
481 sock_valbool_flag(sk, SOCK_URGINLINE, valbool);
485 sk->sk_no_check = valbool;
489 if ((val >= 0 && val <= 6) || capable(CAP_NET_ADMIN))
490 sk->sk_priority = val;
496 if(optlen<sizeof(ling)) {
497 ret = -EINVAL; /* 1003.1g */
500 if (copy_from_user(&ling,optval,sizeof(ling))) {
505 sock_reset_flag(sk, SOCK_LINGER);
507 #if (BITS_PER_LONG == 32)
508 if ((unsigned int)ling.l_linger >= MAX_SCHEDULE_TIMEOUT/HZ)
509 sk->sk_lingertime = MAX_SCHEDULE_TIMEOUT;
512 sk->sk_lingertime = (unsigned int)ling.l_linger * HZ;
513 sock_set_flag(sk, SOCK_LINGER);
518 sock_warn_obsolete_bsdism("setsockopt");
523 set_bit(SOCK_PASSCRED, &sock->flags);
525 clear_bit(SOCK_PASSCRED, &sock->flags);
530 sock_set_flag(sk, SOCK_RCVTSTAMP);
531 sock_enable_timestamp(sk);
533 sock_reset_flag(sk, SOCK_RCVTSTAMP);
539 sk->sk_rcvlowat = val ? : 1;
543 ret = sock_set_timeout(&sk->sk_rcvtimeo, optval, optlen);
547 ret = sock_set_timeout(&sk->sk_sndtimeo, optval, optlen);
550 #ifdef CONFIG_NETDEVICES
551 case SO_BINDTODEVICE:
553 char devname[IFNAMSIZ];
556 if (!capable(CAP_NET_RAW)) {
561 /* Bind this socket to a particular device like "eth0",
562 * as specified in the passed interface name. If the
563 * name is "" or the option length is zero the socket
568 sk->sk_bound_dev_if = 0;
570 if (optlen > IFNAMSIZ - 1)
571 optlen = IFNAMSIZ - 1;
572 memset(devname, 0, sizeof(devname));
573 if (copy_from_user(devname, optval, optlen)) {
578 /* Remove any cached route for this socket. */
581 if (devname[0] == '\0') {
582 sk->sk_bound_dev_if = 0;
584 struct net_device *dev = dev_get_by_name(devname);
589 sk->sk_bound_dev_if = dev->ifindex;
598 case SO_ATTACH_FILTER:
600 if (optlen == sizeof(struct sock_fprog)) {
601 struct sock_fprog fprog;
604 if (copy_from_user(&fprog, optval, sizeof(fprog)))
607 ret = sk_attach_filter(&fprog, sk);
611 case SO_DETACH_FILTER:
612 spin_lock_bh(&sk->sk_lock.slock);
613 filter = sk->sk_filter;
615 sk->sk_filter = NULL;
616 spin_unlock_bh(&sk->sk_lock.slock);
617 sk_filter_release(sk, filter);
620 spin_unlock_bh(&sk->sk_lock.slock);
626 set_bit(SOCK_PASSSEC, &sock->flags);
628 clear_bit(SOCK_PASSSEC, &sock->flags);
631 /* We implement the SO_SNDLOWAT etc to
632 not be settable (1003.1g 5.3) */
642 int sock_getsockopt(struct socket *sock, int level, int optname,
643 char __user *optval, int __user *optlen)
645 struct sock *sk = sock->sk;
654 unsigned int lv = sizeof(int);
657 if(get_user(len,optlen))
665 v.val = sock_flag(sk, SOCK_DBG);
669 v.val = sock_flag(sk, SOCK_LOCALROUTE);
673 v.val = !!sock_flag(sk, SOCK_BROADCAST);
677 v.val = sk->sk_sndbuf;
681 v.val = sk->sk_rcvbuf;
685 v.val = sk->sk_reuse;
689 v.val = !!sock_flag(sk, SOCK_KEEPOPEN);
697 v.val = -sock_error(sk);
699 v.val = xchg(&sk->sk_err_soft, 0);
703 v.val = !!sock_flag(sk, SOCK_URGINLINE);
707 v.val = sk->sk_no_check;
711 v.val = sk->sk_priority;
716 v.ling.l_onoff = !!sock_flag(sk, SOCK_LINGER);
717 v.ling.l_linger = sk->sk_lingertime / HZ;
721 sock_warn_obsolete_bsdism("getsockopt");
725 v.val = sock_flag(sk, SOCK_RCVTSTAMP);
729 lv=sizeof(struct timeval);
730 if (sk->sk_rcvtimeo == MAX_SCHEDULE_TIMEOUT) {
734 v.tm.tv_sec = sk->sk_rcvtimeo / HZ;
735 v.tm.tv_usec = ((sk->sk_rcvtimeo % HZ) * 1000000) / HZ;
740 lv=sizeof(struct timeval);
741 if (sk->sk_sndtimeo == MAX_SCHEDULE_TIMEOUT) {
745 v.tm.tv_sec = sk->sk_sndtimeo / HZ;
746 v.tm.tv_usec = ((sk->sk_sndtimeo % HZ) * 1000000) / HZ;
751 v.val = sk->sk_rcvlowat;
759 v.val = test_bit(SOCK_PASSCRED, &sock->flags) ? 1 : 0;
763 if (len > sizeof(sk->sk_peercred))
764 len = sizeof(sk->sk_peercred);
765 if (copy_to_user(optval, &sk->sk_peercred, len))
773 if (sock->ops->getname(sock, (struct sockaddr *)address, &lv, 2))
777 if (copy_to_user(optval, address, len))
782 /* Dubious BSD thing... Probably nobody even uses it, but
783 * the UNIX standard wants it for whatever reason... -DaveM
786 v.val = sk->sk_state == TCP_LISTEN;
790 v.val = test_bit(SOCK_PASSSEC, &sock->flags) ? 1 : 0;
794 return security_socket_getpeersec_stream(sock, optval, optlen, len);
797 return(-ENOPROTOOPT);
801 if (copy_to_user(optval, &v, len))
804 if (put_user(len, optlen))
810 * Initialize an sk_lock.
812 * (We also register the sk_lock with the lock validator.)
814 static void inline sock_lock_init(struct sock *sk)
816 sock_lock_init_class_and_name(sk,
817 af_family_slock_key_strings[sk->sk_family],
818 af_family_slock_keys + sk->sk_family,
819 af_family_key_strings[sk->sk_family],
820 af_family_keys + sk->sk_family);
824 * sk_alloc - All socket objects are allocated here
825 * @family: protocol family
826 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
827 * @prot: struct proto associated with this new sock instance
828 * @zero_it: if we should zero the newly allocated sock
830 struct sock *sk_alloc(int family, gfp_t priority,
831 struct proto *prot, int zero_it)
833 struct sock *sk = NULL;
834 kmem_cache_t *slab = prot->slab;
837 sk = kmem_cache_alloc(slab, priority);
839 sk = kmalloc(prot->obj_size, priority);
843 memset(sk, 0, prot->obj_size);
844 sk->sk_family = family;
846 * See comment in struct sock definition to understand
847 * why we need sk_prot_creator -acme
849 sk->sk_prot = sk->sk_prot_creator = prot;
855 if (security_sk_alloc(sk, family, priority))
858 if (!try_module_get(prot->owner))
865 kmem_cache_free(slab, sk);
871 void sk_free(struct sock *sk)
873 struct sk_filter *filter;
874 struct module *owner = sk->sk_prot_creator->owner;
879 filter = sk->sk_filter;
881 sk_filter_release(sk, filter);
882 sk->sk_filter = NULL;
885 sock_disable_timestamp(sk);
887 if (atomic_read(&sk->sk_omem_alloc))
888 printk(KERN_DEBUG "%s: optmem leakage (%d bytes) detected.\n",
889 __FUNCTION__, atomic_read(&sk->sk_omem_alloc));
891 security_sk_free(sk);
893 clr_vx_info(&sk->sk_vx_info);
895 clr_nx_info(&sk->sk_nx_info);
897 if (sk->sk_prot_creator->slab != NULL)
898 kmem_cache_free(sk->sk_prot_creator->slab, sk);
904 struct sock *sk_clone(struct sock *sk, const gfp_t priority)
906 struct sock *newsk = sk_alloc(sk->sk_family, priority, sk->sk_prot, 0);
909 struct sk_filter *filter;
911 memcpy(newsk, sk, sk->sk_prot->obj_size);
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 (sk->sk_create_child)
949 sk->sk_create_child(sk, newsk);
951 if (unlikely(xfrm_sk_clone_policy(newsk))) {
952 /* It is still raw copy of parent, so invalidate
953 * destructor and make plain sk_free() */
954 newsk->sk_destruct = NULL;
961 newsk->sk_priority = 0;
962 atomic_set(&newsk->sk_refcnt, 2);
964 set_vx_info(&newsk->sk_vx_info, sk->sk_vx_info);
965 newsk->sk_xid = sk->sk_xid;
967 set_nx_info(&newsk->sk_nx_info, sk->sk_nx_info);
968 newsk->sk_nid = sk->sk_nid;
971 * Increment the counter in the same struct proto as the master
972 * sock (sk_refcnt_debug_inc uses newsk->sk_prot->socks, that
973 * is the same as sk->sk_prot->socks, as this field was copied
976 * This _changes_ the previous behaviour, where
977 * tcp_create_openreq_child always was incrementing the
978 * equivalent to tcp_prot->socks (inet_sock_nr), so this have
979 * to be taken into account in all callers. -acme
981 sk_refcnt_debug_inc(newsk);
982 newsk->sk_socket = NULL;
983 newsk->sk_sleep = NULL;
985 if (newsk->sk_prot->sockets_allocated)
986 atomic_inc(newsk->sk_prot->sockets_allocated);
992 EXPORT_SYMBOL_GPL(sk_clone);
994 void __init sk_init(void)
996 if (num_physpages <= 4096) {
997 sysctl_wmem_max = 32767;
998 sysctl_rmem_max = 32767;
999 sysctl_wmem_default = 32767;
1000 sysctl_rmem_default = 32767;
1001 } else if (num_physpages >= 131072) {
1002 sysctl_wmem_max = 131071;
1003 sysctl_rmem_max = 131071;
1008 * Simple resource managers for sockets.
1013 * Write buffer destructor automatically called from kfree_skb.
1015 void sock_wfree(struct sk_buff *skb)
1017 struct sock *sk = skb->sk;
1019 /* In case it might be waiting for more memory. */
1020 atomic_sub(skb->truesize, &sk->sk_wmem_alloc);
1021 if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE))
1022 sk->sk_write_space(sk);
1027 * Read buffer destructor automatically called from kfree_skb.
1029 void sock_rfree(struct sk_buff *skb)
1031 struct sock *sk = skb->sk;
1033 atomic_sub(skb->truesize, &sk->sk_rmem_alloc);
1037 int sock_i_uid(struct sock *sk)
1041 read_lock(&sk->sk_callback_lock);
1042 uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : 0;
1043 read_unlock(&sk->sk_callback_lock);
1047 unsigned long sock_i_ino(struct sock *sk)
1051 read_lock(&sk->sk_callback_lock);
1052 ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0;
1053 read_unlock(&sk->sk_callback_lock);
1058 * Allocate a skb from the socket's send buffer.
1060 struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force,
1063 if (force || atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
1064 struct sk_buff * skb = alloc_skb(size, priority);
1066 skb_set_owner_w(skb, sk);
1074 * Allocate a skb from the socket's receive buffer.
1076 struct sk_buff *sock_rmalloc(struct sock *sk, unsigned long size, int force,
1079 if (force || atomic_read(&sk->sk_rmem_alloc) < sk->sk_rcvbuf) {
1080 struct sk_buff *skb = alloc_skb(size, priority);
1082 skb_set_owner_r(skb, sk);
1090 * Allocate a memory block from the socket's option memory buffer.
1092 void *sock_kmalloc(struct sock *sk, int size, gfp_t priority)
1094 if ((unsigned)size <= sysctl_optmem_max &&
1095 atomic_read(&sk->sk_omem_alloc) + size < sysctl_optmem_max) {
1097 /* First do the add, to avoid the race if kmalloc
1100 atomic_add(size, &sk->sk_omem_alloc);
1101 mem = kmalloc(size, priority);
1104 atomic_sub(size, &sk->sk_omem_alloc);
1110 * Free an option memory block.
1112 void sock_kfree_s(struct sock *sk, void *mem, int size)
1115 atomic_sub(size, &sk->sk_omem_alloc);
1118 /* It is almost wait_for_tcp_memory minus release_sock/lock_sock.
1119 I think, these locks should be removed for datagram sockets.
1121 static long sock_wait_for_wmem(struct sock * sk, long timeo)
1125 clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1129 if (signal_pending(current))
1131 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1132 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
1133 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf)
1135 if (sk->sk_shutdown & SEND_SHUTDOWN)
1139 timeo = schedule_timeout(timeo);
1141 finish_wait(sk->sk_sleep, &wait);
1147 * Generic send/receive buffer handlers
1150 static struct sk_buff *sock_alloc_send_pskb(struct sock *sk,
1151 unsigned long header_len,
1152 unsigned long data_len,
1153 int noblock, int *errcode)
1155 struct sk_buff *skb;
1160 gfp_mask = sk->sk_allocation;
1161 if (gfp_mask & __GFP_WAIT)
1162 gfp_mask |= __GFP_REPEAT;
1164 timeo = sock_sndtimeo(sk, noblock);
1166 err = sock_error(sk);
1171 if (sk->sk_shutdown & SEND_SHUTDOWN)
1174 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
1175 skb = alloc_skb(header_len, gfp_mask);
1180 /* No pages, we're done... */
1184 npages = (data_len + (PAGE_SIZE - 1)) >> PAGE_SHIFT;
1185 skb->truesize += data_len;
1186 skb_shinfo(skb)->nr_frags = npages;
1187 for (i = 0; i < npages; i++) {
1191 page = alloc_pages(sk->sk_allocation, 0);
1194 skb_shinfo(skb)->nr_frags = i;
1199 frag = &skb_shinfo(skb)->frags[i];
1201 frag->page_offset = 0;
1202 frag->size = (data_len >= PAGE_SIZE ?
1205 data_len -= PAGE_SIZE;
1208 /* Full success... */
1214 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1215 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1219 if (signal_pending(current))
1221 timeo = sock_wait_for_wmem(sk, timeo);
1224 skb_set_owner_w(skb, sk);
1228 err = sock_intr_errno(timeo);
1234 struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size,
1235 int noblock, int *errcode)
1237 return sock_alloc_send_pskb(sk, size, 0, noblock, errcode);
1240 static void __lock_sock(struct sock *sk)
1245 prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait,
1246 TASK_UNINTERRUPTIBLE);
1247 spin_unlock_bh(&sk->sk_lock.slock);
1249 spin_lock_bh(&sk->sk_lock.slock);
1250 if(!sock_owned_by_user(sk))
1253 finish_wait(&sk->sk_lock.wq, &wait);
1256 static void __release_sock(struct sock *sk)
1258 struct sk_buff *skb = sk->sk_backlog.head;
1261 sk->sk_backlog.head = sk->sk_backlog.tail = NULL;
1265 struct sk_buff *next = skb->next;
1268 sk->sk_backlog_rcv(sk, skb);
1271 * We are in process context here with softirqs
1272 * disabled, use cond_resched_softirq() to preempt.
1273 * This is safe to do because we've taken the backlog
1276 cond_resched_softirq();
1279 } while (skb != NULL);
1282 } while((skb = sk->sk_backlog.head) != NULL);
1286 * sk_wait_data - wait for data to arrive at sk_receive_queue
1287 * @sk: sock to wait on
1288 * @timeo: for how long
1290 * Now socket state including sk->sk_err is changed only under lock,
1291 * hence we may omit checks after joining wait queue.
1292 * We check receive queue before schedule() only as optimization;
1293 * it is very likely that release_sock() added new data.
1295 int sk_wait_data(struct sock *sk, long *timeo)
1300 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
1301 set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
1302 rc = sk_wait_event(sk, timeo, !skb_queue_empty(&sk->sk_receive_queue));
1303 clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
1304 finish_wait(sk->sk_sleep, &wait);
1308 EXPORT_SYMBOL(sk_wait_data);
1311 * Set of default routines for initialising struct proto_ops when
1312 * the protocol does not support a particular function. In certain
1313 * cases where it makes no sense for a protocol to have a "do nothing"
1314 * function, some default processing is provided.
1317 int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len)
1322 int sock_no_connect(struct socket *sock, struct sockaddr *saddr,
1328 int sock_no_socketpair(struct socket *sock1, struct socket *sock2)
1333 int sock_no_accept(struct socket *sock, struct socket *newsock, int flags)
1338 int sock_no_getname(struct socket *sock, struct sockaddr *saddr,
1344 unsigned int sock_no_poll(struct file * file, struct socket *sock, poll_table *pt)
1349 int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1354 int sock_no_listen(struct socket *sock, int backlog)
1359 int sock_no_shutdown(struct socket *sock, int how)
1364 int sock_no_setsockopt(struct socket *sock, int level, int optname,
1365 char __user *optval, int optlen)
1370 int sock_no_getsockopt(struct socket *sock, int level, int optname,
1371 char __user *optval, int __user *optlen)
1376 int sock_no_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
1382 int sock_no_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
1383 size_t len, int flags)
1388 int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma)
1390 /* Mirror missing mmap method error code */
1394 ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags)
1397 struct msghdr msg = {.msg_flags = flags};
1399 char *kaddr = kmap(page);
1400 iov.iov_base = kaddr + offset;
1402 res = kernel_sendmsg(sock, &msg, &iov, 1, size);
1408 * Default Socket Callbacks
1411 static void sock_def_wakeup(struct sock *sk)
1413 read_lock(&sk->sk_callback_lock);
1414 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
1415 wake_up_interruptible_all(sk->sk_sleep);
1416 read_unlock(&sk->sk_callback_lock);
1419 static void sock_def_error_report(struct sock *sk)
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,0,POLL_ERR);
1425 read_unlock(&sk->sk_callback_lock);
1428 static void sock_def_readable(struct sock *sk, int len)
1430 read_lock(&sk->sk_callback_lock);
1431 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
1432 wake_up_interruptible(sk->sk_sleep);
1433 sk_wake_async(sk,1,POLL_IN);
1434 read_unlock(&sk->sk_callback_lock);
1437 static void sock_def_write_space(struct sock *sk)
1439 read_lock(&sk->sk_callback_lock);
1441 /* Do not wake up a writer until he can make "significant"
1444 if((atomic_read(&sk->sk_wmem_alloc) << 1) <= sk->sk_sndbuf) {
1445 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
1446 wake_up_interruptible(sk->sk_sleep);
1448 /* Should agree with poll, otherwise some programs break */
1449 if (sock_writeable(sk))
1450 sk_wake_async(sk, 2, POLL_OUT);
1453 read_unlock(&sk->sk_callback_lock);
1456 static void sock_def_destruct(struct sock *sk)
1458 kfree(sk->sk_protinfo);
1461 void sk_send_sigurg(struct sock *sk)
1463 if (sk->sk_socket && sk->sk_socket->file)
1464 if (send_sigurg(&sk->sk_socket->file->f_owner))
1465 sk_wake_async(sk, 3, POLL_PRI);
1468 void sk_reset_timer(struct sock *sk, struct timer_list* timer,
1469 unsigned long expires)
1471 if (!mod_timer(timer, expires))
1475 EXPORT_SYMBOL(sk_reset_timer);
1477 void sk_stop_timer(struct sock *sk, struct timer_list* timer)
1479 if (timer_pending(timer) && del_timer(timer))
1483 EXPORT_SYMBOL(sk_stop_timer);
1485 void sock_init_data(struct socket *sock, struct sock *sk)
1487 skb_queue_head_init(&sk->sk_receive_queue);
1488 skb_queue_head_init(&sk->sk_write_queue);
1489 skb_queue_head_init(&sk->sk_error_queue);
1490 #ifdef CONFIG_NET_DMA
1491 skb_queue_head_init(&sk->sk_async_wait_queue);
1494 sk->sk_send_head = NULL;
1496 init_timer(&sk->sk_timer);
1498 sk->sk_allocation = GFP_KERNEL;
1499 sk->sk_rcvbuf = sysctl_rmem_default;
1500 sk->sk_sndbuf = sysctl_wmem_default;
1501 sk->sk_state = TCP_CLOSE;
1502 sk->sk_socket = sock;
1504 sock_set_flag(sk, SOCK_ZAPPED);
1508 sk->sk_type = sock->type;
1509 sk->sk_sleep = &sock->wait;
1512 sk->sk_sleep = NULL;
1514 rwlock_init(&sk->sk_dst_lock);
1515 rwlock_init(&sk->sk_callback_lock);
1516 lockdep_set_class(&sk->sk_callback_lock,
1517 af_callback_keys + sk->sk_family);
1519 sk->sk_state_change = sock_def_wakeup;
1520 sk->sk_data_ready = sock_def_readable;
1521 sk->sk_write_space = sock_def_write_space;
1522 sk->sk_error_report = sock_def_error_report;
1523 sk->sk_destruct = sock_def_destruct;
1525 sk->sk_sndmsg_page = NULL;
1526 sk->sk_sndmsg_off = 0;
1528 sk->sk_peercred.pid = 0;
1529 sk->sk_peercred.uid = -1;
1530 sk->sk_peercred.gid = -1;
1531 sk->sk_write_pending = 0;
1532 sk->sk_rcvlowat = 1;
1533 sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT;
1534 sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT;
1536 sk->sk_stamp.tv_sec = -1L;
1537 sk->sk_stamp.tv_usec = -1L;
1539 set_vx_info(&sk->sk_vx_info, current->vx_info);
1540 sk->sk_xid = vx_current_xid();
1542 set_nx_info(&sk->sk_nx_info, current->nx_info);
1543 sk->sk_nid = nx_current_nid();
1544 atomic_set(&sk->sk_refcnt, 1);
1547 void fastcall lock_sock(struct sock *sk)
1550 spin_lock_bh(&sk->sk_lock.slock);
1551 if (sk->sk_lock.owner)
1553 sk->sk_lock.owner = (void *)1;
1554 spin_unlock(&sk->sk_lock.slock);
1556 * The sk_lock has mutex_lock() semantics here:
1558 mutex_acquire(&sk->sk_lock.dep_map, 0, 0, _RET_IP_);
1562 EXPORT_SYMBOL(lock_sock);
1564 void fastcall release_sock(struct sock *sk)
1567 * The sk_lock has mutex_unlock() semantics:
1569 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_);
1571 spin_lock_bh(&sk->sk_lock.slock);
1572 if (sk->sk_backlog.tail)
1574 sk->sk_lock.owner = NULL;
1575 if (waitqueue_active(&sk->sk_lock.wq))
1576 wake_up(&sk->sk_lock.wq);
1577 spin_unlock_bh(&sk->sk_lock.slock);
1579 EXPORT_SYMBOL(release_sock);
1581 int sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp)
1583 if (!sock_flag(sk, SOCK_TIMESTAMP))
1584 sock_enable_timestamp(sk);
1585 if (sk->sk_stamp.tv_sec == -1)
1587 if (sk->sk_stamp.tv_sec == 0)
1588 do_gettimeofday(&sk->sk_stamp);
1589 return copy_to_user(userstamp, &sk->sk_stamp, sizeof(struct timeval)) ?
1592 EXPORT_SYMBOL(sock_get_timestamp);
1594 void sock_enable_timestamp(struct sock *sk)
1596 if (!sock_flag(sk, SOCK_TIMESTAMP)) {
1597 sock_set_flag(sk, SOCK_TIMESTAMP);
1598 net_enable_timestamp();
1601 EXPORT_SYMBOL(sock_enable_timestamp);
1604 * Get a socket option on an socket.
1606 * FIX: POSIX 1003.1g is very ambiguous here. It states that
1607 * asynchronous errors should be reported by getsockopt. We assume
1608 * this means if you specify SO_ERROR (otherwise whats the point of it).
1610 int sock_common_getsockopt(struct socket *sock, int level, int optname,
1611 char __user *optval, int __user *optlen)
1613 struct sock *sk = sock->sk;
1615 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
1618 EXPORT_SYMBOL(sock_common_getsockopt);
1620 #ifdef CONFIG_COMPAT
1621 int compat_sock_common_getsockopt(struct socket *sock, int level, int optname,
1622 char __user *optval, int __user *optlen)
1624 struct sock *sk = sock->sk;
1626 if (sk->sk_prot->compat_setsockopt != NULL)
1627 return sk->sk_prot->compat_getsockopt(sk, level, optname,
1629 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
1631 EXPORT_SYMBOL(compat_sock_common_getsockopt);
1634 int sock_common_recvmsg(struct kiocb *iocb, struct socket *sock,
1635 struct msghdr *msg, size_t size, int flags)
1637 struct sock *sk = sock->sk;
1641 err = sk->sk_prot->recvmsg(iocb, sk, msg, size, flags & MSG_DONTWAIT,
1642 flags & ~MSG_DONTWAIT, &addr_len);
1644 msg->msg_namelen = addr_len;
1648 EXPORT_SYMBOL(sock_common_recvmsg);
1651 * Set socket options on an inet socket.
1653 int sock_common_setsockopt(struct socket *sock, int level, int optname,
1654 char __user *optval, int optlen)
1656 struct sock *sk = sock->sk;
1658 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
1661 EXPORT_SYMBOL(sock_common_setsockopt);
1663 #ifdef CONFIG_COMPAT
1664 int compat_sock_common_setsockopt(struct socket *sock, int level, int optname,
1665 char __user *optval, int optlen)
1667 struct sock *sk = sock->sk;
1669 if (sk->sk_prot->compat_setsockopt != NULL)
1670 return sk->sk_prot->compat_setsockopt(sk, level, optname,
1672 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
1674 EXPORT_SYMBOL(compat_sock_common_setsockopt);
1677 void sk_common_release(struct sock *sk)
1679 if (sk->sk_prot->destroy)
1680 sk->sk_prot->destroy(sk);
1683 * Observation: when sock_common_release is called, processes have
1684 * no access to socket. But net still has.
1685 * Step one, detach it from networking:
1687 * A. Remove from hash tables.
1690 sk->sk_prot->unhash(sk);
1693 * In this point socket cannot receive new packets, but it is possible
1694 * that some packets are in flight because some CPU runs receiver and
1695 * did hash table lookup before we unhashed socket. They will achieve
1696 * receive queue and will be purged by socket destructor.
1698 * Also we still have packets pending on receive queue and probably,
1699 * our own packets waiting in device queues. sock_destroy will drain
1700 * receive queue, but transmitted packets will delay socket destruction
1701 * until the last reference will be released.
1706 xfrm_sk_free_policy(sk);
1708 sk_refcnt_debug_release(sk);
1712 EXPORT_SYMBOL(sk_common_release);
1714 static DEFINE_RWLOCK(proto_list_lock);
1715 static LIST_HEAD(proto_list);
1717 int proto_register(struct proto *prot, int alloc_slab)
1719 char *request_sock_slab_name = NULL;
1720 char *timewait_sock_slab_name;
1724 prot->slab = kmem_cache_create(prot->name, prot->obj_size, 0,
1725 SLAB_HWCACHE_ALIGN, NULL, NULL);
1727 if (prot->slab == NULL) {
1728 printk(KERN_CRIT "%s: Can't create sock SLAB cache!\n",
1733 if (prot->rsk_prot != NULL) {
1734 static const char mask[] = "request_sock_%s";
1736 request_sock_slab_name = kmalloc(strlen(prot->name) + sizeof(mask) - 1, GFP_KERNEL);
1737 if (request_sock_slab_name == NULL)
1738 goto out_free_sock_slab;
1740 sprintf(request_sock_slab_name, mask, prot->name);
1741 prot->rsk_prot->slab = kmem_cache_create(request_sock_slab_name,
1742 prot->rsk_prot->obj_size, 0,
1743 SLAB_HWCACHE_ALIGN, NULL, NULL);
1745 if (prot->rsk_prot->slab == NULL) {
1746 printk(KERN_CRIT "%s: Can't create request sock SLAB cache!\n",
1748 goto out_free_request_sock_slab_name;
1752 if (prot->twsk_prot != NULL) {
1753 static const char mask[] = "tw_sock_%s";
1755 timewait_sock_slab_name = kmalloc(strlen(prot->name) + sizeof(mask) - 1, GFP_KERNEL);
1757 if (timewait_sock_slab_name == NULL)
1758 goto out_free_request_sock_slab;
1760 sprintf(timewait_sock_slab_name, mask, prot->name);
1761 prot->twsk_prot->twsk_slab =
1762 kmem_cache_create(timewait_sock_slab_name,
1763 prot->twsk_prot->twsk_obj_size,
1764 0, SLAB_HWCACHE_ALIGN,
1766 if (prot->twsk_prot->twsk_slab == NULL)
1767 goto out_free_timewait_sock_slab_name;
1771 write_lock(&proto_list_lock);
1772 list_add(&prot->node, &proto_list);
1773 write_unlock(&proto_list_lock);
1777 out_free_timewait_sock_slab_name:
1778 kfree(timewait_sock_slab_name);
1779 out_free_request_sock_slab:
1780 if (prot->rsk_prot && prot->rsk_prot->slab) {
1781 kmem_cache_destroy(prot->rsk_prot->slab);
1782 prot->rsk_prot->slab = NULL;
1784 out_free_request_sock_slab_name:
1785 kfree(request_sock_slab_name);
1787 kmem_cache_destroy(prot->slab);
1792 EXPORT_SYMBOL(proto_register);
1794 void proto_unregister(struct proto *prot)
1796 write_lock(&proto_list_lock);
1797 list_del(&prot->node);
1798 write_unlock(&proto_list_lock);
1800 if (prot->slab != NULL) {
1801 kmem_cache_destroy(prot->slab);
1805 if (prot->rsk_prot != NULL && prot->rsk_prot->slab != NULL) {
1806 const char *name = kmem_cache_name(prot->rsk_prot->slab);
1808 kmem_cache_destroy(prot->rsk_prot->slab);
1810 prot->rsk_prot->slab = NULL;
1813 if (prot->twsk_prot != NULL && prot->twsk_prot->twsk_slab != NULL) {
1814 const char *name = kmem_cache_name(prot->twsk_prot->twsk_slab);
1816 kmem_cache_destroy(prot->twsk_prot->twsk_slab);
1818 prot->twsk_prot->twsk_slab = NULL;
1822 EXPORT_SYMBOL(proto_unregister);
1824 #ifdef CONFIG_PROC_FS
1825 static inline struct proto *__proto_head(void)
1827 return list_entry(proto_list.next, struct proto, node);
1830 static inline struct proto *proto_head(void)
1832 return list_empty(&proto_list) ? NULL : __proto_head();
1835 static inline struct proto *proto_next(struct proto *proto)
1837 return proto->node.next == &proto_list ? NULL :
1838 list_entry(proto->node.next, struct proto, node);
1841 static inline struct proto *proto_get_idx(loff_t pos)
1843 struct proto *proto;
1846 list_for_each_entry(proto, &proto_list, node)
1855 static void *proto_seq_start(struct seq_file *seq, loff_t *pos)
1857 read_lock(&proto_list_lock);
1858 return *pos ? proto_get_idx(*pos - 1) : SEQ_START_TOKEN;
1861 static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1864 return v == SEQ_START_TOKEN ? proto_head() : proto_next(v);
1867 static void proto_seq_stop(struct seq_file *seq, void *v)
1869 read_unlock(&proto_list_lock);
1872 static char proto_method_implemented(const void *method)
1874 return method == NULL ? 'n' : 'y';
1877 static void proto_seq_printf(struct seq_file *seq, struct proto *proto)
1879 seq_printf(seq, "%-9s %4u %6d %6d %-3s %6u %-3s %-10s "
1880 "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n",
1883 proto->sockets_allocated != NULL ? atomic_read(proto->sockets_allocated) : -1,
1884 proto->memory_allocated != NULL ? atomic_read(proto->memory_allocated) : -1,
1885 proto->memory_pressure != NULL ? *proto->memory_pressure ? "yes" : "no" : "NI",
1887 proto->slab == NULL ? "no" : "yes",
1888 module_name(proto->owner),
1889 proto_method_implemented(proto->close),
1890 proto_method_implemented(proto->connect),
1891 proto_method_implemented(proto->disconnect),
1892 proto_method_implemented(proto->accept),
1893 proto_method_implemented(proto->ioctl),
1894 proto_method_implemented(proto->init),
1895 proto_method_implemented(proto->destroy),
1896 proto_method_implemented(proto->shutdown),
1897 proto_method_implemented(proto->setsockopt),
1898 proto_method_implemented(proto->getsockopt),
1899 proto_method_implemented(proto->sendmsg),
1900 proto_method_implemented(proto->recvmsg),
1901 proto_method_implemented(proto->sendpage),
1902 proto_method_implemented(proto->bind),
1903 proto_method_implemented(proto->backlog_rcv),
1904 proto_method_implemented(proto->hash),
1905 proto_method_implemented(proto->unhash),
1906 proto_method_implemented(proto->get_port),
1907 proto_method_implemented(proto->enter_memory_pressure));
1910 static int proto_seq_show(struct seq_file *seq, void *v)
1912 if (v == SEQ_START_TOKEN)
1913 seq_printf(seq, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s",
1922 "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n");
1924 proto_seq_printf(seq, v);
1928 static struct seq_operations proto_seq_ops = {
1929 .start = proto_seq_start,
1930 .next = proto_seq_next,
1931 .stop = proto_seq_stop,
1932 .show = proto_seq_show,
1935 static int proto_seq_open(struct inode *inode, struct file *file)
1937 return seq_open(file, &proto_seq_ops);
1940 static struct file_operations proto_seq_fops = {
1941 .owner = THIS_MODULE,
1942 .open = proto_seq_open,
1944 .llseek = seq_lseek,
1945 .release = seq_release,
1948 static int __init proto_init(void)
1950 /* register /proc/net/protocols */
1951 return proc_net_fops_create("protocols", S_IRUGO, &proto_seq_fops) == NULL ? -ENOBUFS : 0;
1954 subsys_initcall(proto_init);
1956 #endif /* PROC_FS */
1958 EXPORT_SYMBOL(sk_alloc);
1959 EXPORT_SYMBOL(sk_free);
1960 EXPORT_SYMBOL(sk_send_sigurg);
1961 EXPORT_SYMBOL(sock_alloc_send_skb);
1962 EXPORT_SYMBOL(sock_init_data);
1963 EXPORT_SYMBOL(sock_kfree_s);
1964 EXPORT_SYMBOL(sock_kmalloc);
1965 EXPORT_SYMBOL(sock_no_accept);
1966 EXPORT_SYMBOL(sock_no_bind);
1967 EXPORT_SYMBOL(sock_no_connect);
1968 EXPORT_SYMBOL(sock_no_getname);
1969 EXPORT_SYMBOL(sock_no_getsockopt);
1970 EXPORT_SYMBOL(sock_no_ioctl);
1971 EXPORT_SYMBOL(sock_no_listen);
1972 EXPORT_SYMBOL(sock_no_mmap);
1973 EXPORT_SYMBOL(sock_no_poll);
1974 EXPORT_SYMBOL(sock_no_recvmsg);
1975 EXPORT_SYMBOL(sock_no_sendmsg);
1976 EXPORT_SYMBOL(sock_no_sendpage);
1977 EXPORT_SYMBOL(sock_no_setsockopt);
1978 EXPORT_SYMBOL(sock_no_shutdown);
1979 EXPORT_SYMBOL(sock_no_socketpair);
1980 EXPORT_SYMBOL(sock_rfree);
1981 EXPORT_SYMBOL(sock_setsockopt);
1982 EXPORT_SYMBOL(sock_wfree);
1983 EXPORT_SYMBOL(sock_wmalloc);
1984 EXPORT_SYMBOL(sock_i_uid);
1985 EXPORT_SYMBOL(sock_i_ino);
1986 EXPORT_SYMBOL(sysctl_optmem_max);
1987 #ifdef CONFIG_SYSCTL
1988 EXPORT_SYMBOL(sysctl_rmem_max);
1989 EXPORT_SYMBOL(sysctl_wmem_max);