2 * INET An implementation of the TCP/IP protocol suite for the LINUX
3 * operating system. INET is implemented using the BSD Socket
4 * interface as the means of communication with the user level.
6 * Generic socket support routines. Memory allocators, socket lock/release
7 * handler for protocols to use and generic option handler.
11 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
12 * Florian La Roche, <flla@stud.uni-sb.de>
13 * Alan Cox, <A.Cox@swansea.ac.uk>
16 * Alan Cox : Numerous verify_area() problems
17 * Alan Cox : Connecting on a connecting socket
18 * now returns an error for tcp.
19 * Alan Cox : sock->protocol is set correctly.
20 * and is not sometimes left as 0.
21 * Alan Cox : connect handles icmp errors on a
22 * connect properly. Unfortunately there
23 * is a restart syscall nasty there. I
24 * can't match BSD without hacking the C
25 * library. Ideas urgently sought!
26 * Alan Cox : Disallow bind() to addresses that are
27 * not ours - especially broadcast ones!!
28 * Alan Cox : Socket 1024 _IS_ ok for users. (fencepost)
29 * Alan Cox : sock_wfree/sock_rfree don't destroy sockets,
30 * instead they leave that for the DESTROY timer.
31 * Alan Cox : Clean up error flag in accept
32 * Alan Cox : TCP ack handling is buggy, the DESTROY timer
33 * was buggy. Put a remove_sock() in the handler
34 * for memory when we hit 0. Also altered the timer
35 * code. The ACK stuff can wait and needs major
37 * Alan Cox : Fixed TCP ack bug, removed remove sock
38 * and fixed timer/inet_bh race.
39 * Alan Cox : Added zapped flag for TCP
40 * Alan Cox : Move kfree_skb into skbuff.c and tidied up surplus code
41 * Alan Cox : for new sk_buff allocations wmalloc/rmalloc now call alloc_skb
42 * Alan Cox : kfree_s calls now are kfree_skbmem so we can track skb resources
43 * Alan Cox : Supports socket option broadcast now as does udp. Packet and raw need fixing.
44 * Alan Cox : Added RCVBUF,SNDBUF size setting. It suddenly occurred to me how easy it was so...
45 * Rick Sladkey : Relaxed UDP rules for matching packets.
46 * C.E.Hawkins : IFF_PROMISC/SIOCGHWADDR support
47 * Pauline Middelink : identd support
48 * Alan Cox : Fixed connect() taking signals I think.
49 * Alan Cox : SO_LINGER supported
50 * Alan Cox : Error reporting fixes
51 * Anonymous : inet_create tidied up (sk->reuse setting)
52 * Alan Cox : inet sockets don't set sk->type!
53 * Alan Cox : Split socket option code
54 * Alan Cox : Callbacks
55 * Alan Cox : Nagle flag for Charles & Johannes stuff
56 * Alex : Removed restriction on inet fioctl
57 * Alan Cox : Splitting INET from NET core
58 * Alan Cox : Fixed bogus SO_TYPE handling in getsockopt()
59 * Adam Caldwell : Missing return in SO_DONTROUTE/SO_DEBUG code
60 * Alan Cox : Split IP from generic code
61 * Alan Cox : New kfree_skbmem()
62 * Alan Cox : Make SO_DEBUG superuser only.
63 * Alan Cox : Allow anyone to clear SO_DEBUG
65 * Alan Cox : Added optimistic memory grabbing for AF_UNIX throughput.
66 * Alan Cox : Allocator for a socket is settable.
67 * Alan Cox : SO_ERROR includes soft errors.
68 * Alan Cox : Allow NULL arguments on some SO_ opts
69 * Alan Cox : Generic socket allocation to make hooks
70 * easier (suggested by Craig Metz).
71 * Michael Pall : SO_ERROR returns positive errno again
72 * Steve Whitehouse: Added default destructor to free
73 * protocol private data.
74 * Steve Whitehouse: Added various other default routines
75 * common to several socket families.
76 * Chris Evans : Call suser() check last on F_SETOWN
77 * Jay Schulist : Added SO_ATTACH_FILTER and SO_DETACH_FILTER.
78 * Andi Kleen : Add sock_kmalloc()/sock_kfree_s()
79 * Andi Kleen : Fix write_space callback
80 * Chris Evans : Security fixes - signedness again
81 * Arnaldo C. Melo : cleanups, use skb_queue_purge
86 * This program is free software; you can redistribute it and/or
87 * modify it under the terms of the GNU General Public License
88 * as published by the Free Software Foundation; either version
89 * 2 of the License, or (at your option) any later version.
92 #include <linux/capability.h>
93 #include <linux/errno.h>
94 #include <linux/types.h>
95 #include <linux/socket.h>
97 #include <linux/kernel.h>
98 #include <linux/module.h>
99 #include <linux/proc_fs.h>
100 #include <linux/seq_file.h>
101 #include <linux/sched.h>
102 #include <linux/timer.h>
103 #include <linux/string.h>
104 #include <linux/sockios.h>
105 #include <linux/net.h>
106 #include <linux/mm.h>
107 #include <linux/slab.h>
108 #include <linux/interrupt.h>
109 #include <linux/poll.h>
110 #include <linux/tcp.h>
111 #include <linux/init.h>
112 #include <linux/highmem.h>
114 #include <asm/uaccess.h>
115 #include <asm/system.h>
117 #include <linux/netdevice.h>
118 #include <net/protocol.h>
119 #include <linux/skbuff.h>
120 #include <net/net_namespace.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-AF_CAN" ,
156 "sk_lock-AF_TIPC" , "sk_lock-AF_BLUETOOTH", "sk_lock-IUCV" ,
157 "sk_lock-AF_RXRPC" , "sk_lock-AF_ISDN" , "sk_lock-AF_PHONET" ,
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-AF_CAN" ,
171 "slock-AF_TIPC" , "slock-AF_BLUETOOTH", "slock-AF_IUCV" ,
172 "slock-AF_RXRPC" , "slock-AF_ISDN" , "slock-AF_PHONET" ,
175 static const char *af_family_clock_key_strings[AF_MAX+1] = {
176 "clock-AF_UNSPEC", "clock-AF_UNIX" , "clock-AF_INET" ,
177 "clock-AF_AX25" , "clock-AF_IPX" , "clock-AF_APPLETALK",
178 "clock-AF_NETROM", "clock-AF_BRIDGE" , "clock-AF_ATMPVC" ,
179 "clock-AF_X25" , "clock-AF_INET6" , "clock-AF_ROSE" ,
180 "clock-AF_DECnet", "clock-AF_NETBEUI" , "clock-AF_SECURITY" ,
181 "clock-AF_KEY" , "clock-AF_NETLINK" , "clock-AF_PACKET" ,
182 "clock-AF_ASH" , "clock-AF_ECONET" , "clock-AF_ATMSVC" ,
183 "clock-21" , "clock-AF_SNA" , "clock-AF_IRDA" ,
184 "clock-AF_PPPOX" , "clock-AF_WANPIPE" , "clock-AF_LLC" ,
185 "clock-27" , "clock-28" , "clock-AF_CAN" ,
186 "clock-AF_TIPC" , "clock-AF_BLUETOOTH", "clock-AF_IUCV" ,
187 "clock-AF_RXRPC" , "clock-AF_ISDN" , "clock-AF_PHONET" ,
193 * sk_callback_lock locking rules are per-address-family,
194 * so split the lock classes by using a per-AF key:
196 static struct lock_class_key af_callback_keys[AF_MAX];
198 /* Take into consideration the size of the struct sk_buff overhead in the
199 * determination of these values, since that is non-constant across
200 * platforms. This makes socket queueing behavior and performance
201 * not depend upon such differences.
203 #define _SK_MEM_PACKETS 256
204 #define _SK_MEM_OVERHEAD (sizeof(struct sk_buff) + 256)
205 #define SK_WMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS)
206 #define SK_RMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS)
208 /* Run time adjustable parameters. */
209 __u32 sysctl_wmem_max __read_mostly = SK_WMEM_MAX;
210 __u32 sysctl_rmem_max __read_mostly = SK_RMEM_MAX;
211 __u32 sysctl_wmem_default __read_mostly = SK_WMEM_MAX;
212 __u32 sysctl_rmem_default __read_mostly = SK_RMEM_MAX;
214 /* Maximal space eaten by iovec or ancilliary data plus some space */
215 int sysctl_optmem_max __read_mostly = sizeof(unsigned long)*(2*UIO_MAXIOV+512);
217 static int sock_set_timeout(long *timeo_p, char __user *optval, int optlen)
221 if (optlen < sizeof(tv))
223 if (copy_from_user(&tv, optval, sizeof(tv)))
225 if (tv.tv_usec < 0 || tv.tv_usec >= USEC_PER_SEC)
229 static int warned __read_mostly;
232 if (warned < 10 && net_ratelimit()) {
234 printk(KERN_INFO "sock_set_timeout: `%s' (pid %d) "
235 "tries to set negative timeout\n",
236 current->comm, task_pid_nr(current));
240 *timeo_p = MAX_SCHEDULE_TIMEOUT;
241 if (tv.tv_sec == 0 && tv.tv_usec == 0)
243 if (tv.tv_sec < (MAX_SCHEDULE_TIMEOUT/HZ - 1))
244 *timeo_p = tv.tv_sec*HZ + (tv.tv_usec+(1000000/HZ-1))/(1000000/HZ);
248 static void sock_warn_obsolete_bsdism(const char *name)
251 static char warncomm[TASK_COMM_LEN];
252 if (strcmp(warncomm, current->comm) && warned < 5) {
253 strcpy(warncomm, current->comm);
254 printk(KERN_WARNING "process `%s' is using obsolete "
255 "%s SO_BSDCOMPAT\n", warncomm, name);
260 static void sock_disable_timestamp(struct sock *sk)
262 if (sock_flag(sk, SOCK_TIMESTAMP)) {
263 sock_reset_flag(sk, SOCK_TIMESTAMP);
264 net_disable_timestamp();
269 int sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
274 /* Cast sk->rcvbuf to unsigned... It's pointless, but reduces
275 number of warnings when compiling with -W --ANK
277 if (atomic_read(&sk->sk_rmem_alloc) + skb->truesize >=
278 (unsigned)sk->sk_rcvbuf) {
283 err = sk_filter(sk, skb);
287 if (!sk_rmem_schedule(sk, skb->truesize)) {
293 skb_set_owner_r(skb, sk);
295 /* Cache the SKB length before we tack it onto the receive
296 * queue. Once it is added it no longer belongs to us and
297 * may be freed by other threads of control pulling packets
302 skb_queue_tail(&sk->sk_receive_queue, skb);
304 if (!sock_flag(sk, SOCK_DEAD))
305 sk->sk_data_ready(sk, skb_len);
309 EXPORT_SYMBOL(sock_queue_rcv_skb);
311 int sk_receive_skb(struct sock *sk, struct sk_buff *skb, const int nested)
313 int rc = NET_RX_SUCCESS;
315 if (sk_filter(sk, skb))
316 goto discard_and_relse;
321 bh_lock_sock_nested(sk);
324 if (!sock_owned_by_user(sk)) {
326 * trylock + unlock semantics:
328 mutex_acquire(&sk->sk_lock.dep_map, 0, 1, _RET_IP_);
330 rc = sk_backlog_rcv(sk, skb);
332 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_);
334 sk_add_backlog(sk, skb);
343 EXPORT_SYMBOL(sk_receive_skb);
345 struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie)
347 struct dst_entry *dst = sk->sk_dst_cache;
349 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
350 sk->sk_dst_cache = NULL;
357 EXPORT_SYMBOL(__sk_dst_check);
359 struct dst_entry *sk_dst_check(struct sock *sk, u32 cookie)
361 struct dst_entry *dst = sk_dst_get(sk);
363 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
371 EXPORT_SYMBOL(sk_dst_check);
373 static int sock_bindtodevice(struct sock *sk, char __user *optval, int optlen)
375 int ret = -ENOPROTOOPT;
376 #ifdef CONFIG_NETDEVICES
377 struct net *net = sock_net(sk);
378 char devname[IFNAMSIZ];
383 if (!capable(CAP_NET_RAW))
390 /* Bind this socket to a particular device like "eth0",
391 * as specified in the passed interface name. If the
392 * name is "" or the option length is zero the socket
395 if (optlen > IFNAMSIZ - 1)
396 optlen = IFNAMSIZ - 1;
397 memset(devname, 0, sizeof(devname));
400 if (copy_from_user(devname, optval, optlen))
403 if (devname[0] == '\0') {
406 struct net_device *dev = dev_get_by_name(net, devname);
412 index = dev->ifindex;
417 sk->sk_bound_dev_if = index;
429 static inline void sock_valbool_flag(struct sock *sk, int bit, int valbool)
432 sock_set_flag(sk, bit);
434 sock_reset_flag(sk, bit);
438 * This is meant for all protocols to use and covers goings on
439 * at the socket level. Everything here is generic.
442 int sock_setsockopt(struct socket *sock, int level, int optname,
443 char __user *optval, int optlen)
445 struct sock *sk=sock->sk;
452 * Options without arguments
455 if (optname == SO_BINDTODEVICE)
456 return sock_bindtodevice(sk, optval, optlen);
458 if (optlen < sizeof(int))
461 if (get_user(val, (int __user *)optval))
470 if (val && !capable(CAP_NET_ADMIN)) {
473 sock_valbool_flag(sk, SOCK_DBG, valbool);
476 sk->sk_reuse = valbool;
483 sock_valbool_flag(sk, SOCK_LOCALROUTE, valbool);
486 sock_valbool_flag(sk, SOCK_BROADCAST, valbool);
489 /* Don't error on this BSD doesn't and if you think
490 about it this is right. Otherwise apps have to
491 play 'guess the biggest size' games. RCVBUF/SNDBUF
492 are treated in BSD as hints */
494 if (val > sysctl_wmem_max)
495 val = sysctl_wmem_max;
497 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
498 if ((val * 2) < SOCK_MIN_SNDBUF)
499 sk->sk_sndbuf = SOCK_MIN_SNDBUF;
501 sk->sk_sndbuf = val * 2;
504 * Wake up sending tasks if we
507 sk->sk_write_space(sk);
511 if (!capable(CAP_NET_ADMIN)) {
518 /* Don't error on this BSD doesn't and if you think
519 about it this is right. Otherwise apps have to
520 play 'guess the biggest size' games. RCVBUF/SNDBUF
521 are treated in BSD as hints */
523 if (val > sysctl_rmem_max)
524 val = sysctl_rmem_max;
526 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
528 * We double it on the way in to account for
529 * "struct sk_buff" etc. overhead. Applications
530 * assume that the SO_RCVBUF setting they make will
531 * allow that much actual data to be received on that
534 * Applications are unaware that "struct sk_buff" and
535 * other overheads allocate from the receive buffer
536 * during socket buffer allocation.
538 * And after considering the possible alternatives,
539 * returning the value we actually used in getsockopt
540 * is the most desirable behavior.
542 if ((val * 2) < SOCK_MIN_RCVBUF)
543 sk->sk_rcvbuf = SOCK_MIN_RCVBUF;
545 sk->sk_rcvbuf = val * 2;
549 if (!capable(CAP_NET_ADMIN)) {
557 if (sk->sk_protocol == IPPROTO_TCP)
558 tcp_set_keepalive(sk, valbool);
560 sock_valbool_flag(sk, SOCK_KEEPOPEN, valbool);
564 sock_valbool_flag(sk, SOCK_URGINLINE, valbool);
568 sk->sk_no_check = valbool;
572 if ((val >= 0 && val <= 6) || capable(CAP_NET_ADMIN))
573 sk->sk_priority = val;
579 if (optlen < sizeof(ling)) {
580 ret = -EINVAL; /* 1003.1g */
583 if (copy_from_user(&ling,optval,sizeof(ling))) {
588 sock_reset_flag(sk, SOCK_LINGER);
590 #if (BITS_PER_LONG == 32)
591 if ((unsigned int)ling.l_linger >= MAX_SCHEDULE_TIMEOUT/HZ)
592 sk->sk_lingertime = MAX_SCHEDULE_TIMEOUT;
595 sk->sk_lingertime = (unsigned int)ling.l_linger * HZ;
596 sock_set_flag(sk, SOCK_LINGER);
601 sock_warn_obsolete_bsdism("setsockopt");
606 set_bit(SOCK_PASSCRED, &sock->flags);
608 clear_bit(SOCK_PASSCRED, &sock->flags);
614 if (optname == SO_TIMESTAMP)
615 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
617 sock_set_flag(sk, SOCK_RCVTSTAMPNS);
618 sock_set_flag(sk, SOCK_RCVTSTAMP);
619 sock_enable_timestamp(sk);
621 sock_reset_flag(sk, SOCK_RCVTSTAMP);
622 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
629 sk->sk_rcvlowat = val ? : 1;
633 ret = sock_set_timeout(&sk->sk_rcvtimeo, optval, optlen);
637 ret = sock_set_timeout(&sk->sk_sndtimeo, optval, optlen);
640 case SO_ATTACH_FILTER:
642 if (optlen == sizeof(struct sock_fprog)) {
643 struct sock_fprog fprog;
646 if (copy_from_user(&fprog, optval, sizeof(fprog)))
649 ret = sk_attach_filter(&fprog, sk);
653 case SO_DETACH_FILTER:
654 ret = sk_detach_filter(sk);
659 set_bit(SOCK_PASSSEC, &sock->flags);
661 clear_bit(SOCK_PASSSEC, &sock->flags);
664 if (!capable(CAP_NET_ADMIN))
671 /* We implement the SO_SNDLOWAT etc to
672 not be settable (1003.1g 5.3) */
682 int sock_getsockopt(struct socket *sock, int level, int optname,
683 char __user *optval, int __user *optlen)
685 struct sock *sk = sock->sk;
693 unsigned int lv = sizeof(int);
696 if (get_user(len, optlen))
703 v.val = sock_flag(sk, SOCK_DBG);
707 v.val = sock_flag(sk, SOCK_LOCALROUTE);
711 v.val = !!sock_flag(sk, SOCK_BROADCAST);
715 v.val = sk->sk_sndbuf;
719 v.val = sk->sk_rcvbuf;
723 v.val = sk->sk_reuse;
727 v.val = !!sock_flag(sk, SOCK_KEEPOPEN);
735 v.val = -sock_error(sk);
737 v.val = xchg(&sk->sk_err_soft, 0);
741 v.val = !!sock_flag(sk, SOCK_URGINLINE);
745 v.val = sk->sk_no_check;
749 v.val = sk->sk_priority;
754 v.ling.l_onoff = !!sock_flag(sk, SOCK_LINGER);
755 v.ling.l_linger = sk->sk_lingertime / HZ;
759 sock_warn_obsolete_bsdism("getsockopt");
763 v.val = sock_flag(sk, SOCK_RCVTSTAMP) &&
764 !sock_flag(sk, SOCK_RCVTSTAMPNS);
768 v.val = sock_flag(sk, SOCK_RCVTSTAMPNS);
772 lv=sizeof(struct timeval);
773 if (sk->sk_rcvtimeo == MAX_SCHEDULE_TIMEOUT) {
777 v.tm.tv_sec = sk->sk_rcvtimeo / HZ;
778 v.tm.tv_usec = ((sk->sk_rcvtimeo % HZ) * 1000000) / HZ;
783 lv=sizeof(struct timeval);
784 if (sk->sk_sndtimeo == MAX_SCHEDULE_TIMEOUT) {
788 v.tm.tv_sec = sk->sk_sndtimeo / HZ;
789 v.tm.tv_usec = ((sk->sk_sndtimeo % HZ) * 1000000) / HZ;
794 v.val = sk->sk_rcvlowat;
802 v.val = test_bit(SOCK_PASSCRED, &sock->flags) ? 1 : 0;
806 if (len > sizeof(sk->sk_peercred))
807 len = sizeof(sk->sk_peercred);
808 if (copy_to_user(optval, &sk->sk_peercred, len))
816 if (sock->ops->getname(sock, (struct sockaddr *)address, &lv, 2))
820 if (copy_to_user(optval, address, len))
825 /* Dubious BSD thing... Probably nobody even uses it, but
826 * the UNIX standard wants it for whatever reason... -DaveM
829 v.val = sk->sk_state == TCP_LISTEN;
833 v.val = test_bit(SOCK_PASSSEC, &sock->flags) ? 1 : 0;
837 return security_socket_getpeersec_stream(sock, optval, optlen, len);
849 if (copy_to_user(optval, &v, len))
852 if (put_user(len, optlen))
858 * Initialize an sk_lock.
860 * (We also register the sk_lock with the lock validator.)
862 static inline void sock_lock_init(struct sock *sk)
864 sock_lock_init_class_and_name(sk,
865 af_family_slock_key_strings[sk->sk_family],
866 af_family_slock_keys + sk->sk_family,
867 af_family_key_strings[sk->sk_family],
868 af_family_keys + sk->sk_family);
871 static void sock_copy(struct sock *nsk, const struct sock *osk)
873 #ifdef CONFIG_SECURITY_NETWORK
874 void *sptr = nsk->sk_security;
877 memcpy(nsk, osk, osk->sk_prot->obj_size);
878 #ifdef CONFIG_SECURITY_NETWORK
879 nsk->sk_security = sptr;
880 security_sk_clone(osk, nsk);
884 static struct sock *sk_prot_alloc(struct proto *prot, gfp_t priority,
888 struct kmem_cache *slab;
892 sk = kmem_cache_alloc(slab, priority);
894 sk = kmalloc(prot->obj_size, priority);
897 if (security_sk_alloc(sk, family, priority))
900 if (!try_module_get(prot->owner))
907 security_sk_free(sk);
910 kmem_cache_free(slab, sk);
916 static void sk_prot_free(struct proto *prot, struct sock *sk)
918 struct kmem_cache *slab;
919 struct module *owner;
924 security_sk_free(sk);
926 kmem_cache_free(slab, sk);
933 * sk_alloc - All socket objects are allocated here
934 * @net: the applicable net namespace
935 * @family: protocol family
936 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
937 * @prot: struct proto associated with this new sock instance
939 struct sock *sk_alloc(struct net *net, int family, gfp_t priority,
944 sk = sk_prot_alloc(prot, priority | __GFP_ZERO, family);
946 sk->sk_family = family;
948 * See comment in struct sock definition to understand
949 * why we need sk_prot_creator -acme
951 sk->sk_prot = sk->sk_prot_creator = prot;
953 sock_net_set(sk, get_net(net));
959 void sk_free(struct sock *sk)
961 struct sk_filter *filter;
966 filter = rcu_dereference(sk->sk_filter);
968 sk_filter_uncharge(sk, filter);
969 rcu_assign_pointer(sk->sk_filter, NULL);
972 sock_disable_timestamp(sk);
974 if (atomic_read(&sk->sk_omem_alloc))
975 printk(KERN_DEBUG "%s: optmem leakage (%d bytes) detected.\n",
976 __func__, atomic_read(&sk->sk_omem_alloc));
978 put_net(sock_net(sk));
979 sk_prot_free(sk->sk_prot_creator, sk);
983 * Last sock_put should drop referrence to sk->sk_net. It has already
984 * been dropped in sk_change_net. Taking referrence to stopping namespace
986 * Take referrence to a socket to remove it from hash _alive_ and after that
987 * destroy it in the context of init_net.
989 void sk_release_kernel(struct sock *sk)
991 if (sk == NULL || sk->sk_socket == NULL)
995 sock_release(sk->sk_socket);
996 release_net(sock_net(sk));
997 sock_net_set(sk, get_net(&init_net));
1000 EXPORT_SYMBOL(sk_release_kernel);
1002 struct sock *sk_clone(const struct sock *sk, const gfp_t priority)
1006 newsk = sk_prot_alloc(sk->sk_prot, priority, sk->sk_family);
1007 if (newsk != NULL) {
1008 struct sk_filter *filter;
1010 sock_copy(newsk, sk);
1013 get_net(sock_net(newsk));
1014 sk_node_init(&newsk->sk_node);
1015 sock_lock_init(newsk);
1016 bh_lock_sock(newsk);
1017 newsk->sk_backlog.head = newsk->sk_backlog.tail = NULL;
1019 atomic_set(&newsk->sk_rmem_alloc, 0);
1020 atomic_set(&newsk->sk_wmem_alloc, 0);
1021 atomic_set(&newsk->sk_omem_alloc, 0);
1022 skb_queue_head_init(&newsk->sk_receive_queue);
1023 skb_queue_head_init(&newsk->sk_write_queue);
1024 #ifdef CONFIG_NET_DMA
1025 skb_queue_head_init(&newsk->sk_async_wait_queue);
1028 rwlock_init(&newsk->sk_dst_lock);
1029 rwlock_init(&newsk->sk_callback_lock);
1030 lockdep_set_class_and_name(&newsk->sk_callback_lock,
1031 af_callback_keys + newsk->sk_family,
1032 af_family_clock_key_strings[newsk->sk_family]);
1034 newsk->sk_dst_cache = NULL;
1035 newsk->sk_wmem_queued = 0;
1036 newsk->sk_forward_alloc = 0;
1037 newsk->sk_send_head = NULL;
1038 newsk->sk_userlocks = sk->sk_userlocks & ~SOCK_BINDPORT_LOCK;
1040 sock_reset_flag(newsk, SOCK_DONE);
1041 skb_queue_head_init(&newsk->sk_error_queue);
1043 filter = newsk->sk_filter;
1045 sk_filter_charge(newsk, filter);
1047 if (unlikely(xfrm_sk_clone_policy(newsk))) {
1048 /* It is still raw copy of parent, so invalidate
1049 * destructor and make plain sk_free() */
1050 newsk->sk_destruct = NULL;
1057 newsk->sk_priority = 0;
1058 atomic_set(&newsk->sk_refcnt, 2);
1061 * Increment the counter in the same struct proto as the master
1062 * sock (sk_refcnt_debug_inc uses newsk->sk_prot->socks, that
1063 * is the same as sk->sk_prot->socks, as this field was copied
1066 * This _changes_ the previous behaviour, where
1067 * tcp_create_openreq_child always was incrementing the
1068 * equivalent to tcp_prot->socks (inet_sock_nr), so this have
1069 * to be taken into account in all callers. -acme
1071 sk_refcnt_debug_inc(newsk);
1072 sk_set_socket(newsk, NULL);
1073 newsk->sk_sleep = NULL;
1075 if (newsk->sk_prot->sockets_allocated)
1076 atomic_inc(newsk->sk_prot->sockets_allocated);
1082 EXPORT_SYMBOL_GPL(sk_clone);
1084 void sk_setup_caps(struct sock *sk, struct dst_entry *dst)
1086 __sk_dst_set(sk, dst);
1087 sk->sk_route_caps = dst->dev->features;
1088 if (sk->sk_route_caps & NETIF_F_GSO)
1089 sk->sk_route_caps |= NETIF_F_GSO_SOFTWARE;
1090 if (sk_can_gso(sk)) {
1091 if (dst->header_len) {
1092 sk->sk_route_caps &= ~NETIF_F_GSO_MASK;
1094 sk->sk_route_caps |= NETIF_F_SG | NETIF_F_HW_CSUM;
1095 sk->sk_gso_max_size = dst->dev->gso_max_size;
1099 EXPORT_SYMBOL_GPL(sk_setup_caps);
1101 void __init sk_init(void)
1103 if (num_physpages <= 4096) {
1104 sysctl_wmem_max = 32767;
1105 sysctl_rmem_max = 32767;
1106 sysctl_wmem_default = 32767;
1107 sysctl_rmem_default = 32767;
1108 } else if (num_physpages >= 131072) {
1109 sysctl_wmem_max = 131071;
1110 sysctl_rmem_max = 131071;
1115 * Simple resource managers for sockets.
1120 * Write buffer destructor automatically called from kfree_skb.
1122 void sock_wfree(struct sk_buff *skb)
1124 struct sock *sk = skb->sk;
1126 /* In case it might be waiting for more memory. */
1127 atomic_sub(skb->truesize, &sk->sk_wmem_alloc);
1128 if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE))
1129 sk->sk_write_space(sk);
1134 * Read buffer destructor automatically called from kfree_skb.
1136 void sock_rfree(struct sk_buff *skb)
1138 struct sock *sk = skb->sk;
1140 skb_truesize_check(skb);
1141 atomic_sub(skb->truesize, &sk->sk_rmem_alloc);
1142 sk_mem_uncharge(skb->sk, skb->truesize);
1146 int sock_i_uid(struct sock *sk)
1150 read_lock(&sk->sk_callback_lock);
1151 uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : 0;
1152 read_unlock(&sk->sk_callback_lock);
1156 unsigned long sock_i_ino(struct sock *sk)
1160 read_lock(&sk->sk_callback_lock);
1161 ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0;
1162 read_unlock(&sk->sk_callback_lock);
1167 * Allocate a skb from the socket's send buffer.
1169 struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force,
1172 if (force || atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
1173 struct sk_buff * skb = alloc_skb(size, priority);
1175 skb_set_owner_w(skb, sk);
1183 * Allocate a skb from the socket's receive buffer.
1185 struct sk_buff *sock_rmalloc(struct sock *sk, unsigned long size, int force,
1188 if (force || atomic_read(&sk->sk_rmem_alloc) < sk->sk_rcvbuf) {
1189 struct sk_buff *skb = alloc_skb(size, priority);
1191 skb_set_owner_r(skb, sk);
1199 * Allocate a memory block from the socket's option memory buffer.
1201 void *sock_kmalloc(struct sock *sk, int size, gfp_t priority)
1203 if ((unsigned)size <= sysctl_optmem_max &&
1204 atomic_read(&sk->sk_omem_alloc) + size < sysctl_optmem_max) {
1206 /* First do the add, to avoid the race if kmalloc
1209 atomic_add(size, &sk->sk_omem_alloc);
1210 mem = kmalloc(size, priority);
1213 atomic_sub(size, &sk->sk_omem_alloc);
1219 * Free an option memory block.
1221 void sock_kfree_s(struct sock *sk, void *mem, int size)
1224 atomic_sub(size, &sk->sk_omem_alloc);
1227 /* It is almost wait_for_tcp_memory minus release_sock/lock_sock.
1228 I think, these locks should be removed for datagram sockets.
1230 static long sock_wait_for_wmem(struct sock * sk, long timeo)
1234 clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1238 if (signal_pending(current))
1240 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1241 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
1242 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf)
1244 if (sk->sk_shutdown & SEND_SHUTDOWN)
1248 timeo = schedule_timeout(timeo);
1250 finish_wait(sk->sk_sleep, &wait);
1256 * Generic send/receive buffer handlers
1259 static struct sk_buff *sock_alloc_send_pskb(struct sock *sk,
1260 unsigned long header_len,
1261 unsigned long data_len,
1262 int noblock, int *errcode)
1264 struct sk_buff *skb;
1269 gfp_mask = sk->sk_allocation;
1270 if (gfp_mask & __GFP_WAIT)
1271 gfp_mask |= __GFP_REPEAT;
1273 timeo = sock_sndtimeo(sk, noblock);
1275 err = sock_error(sk);
1280 if (sk->sk_shutdown & SEND_SHUTDOWN)
1283 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
1284 skb = alloc_skb(header_len, gfp_mask);
1289 /* No pages, we're done... */
1293 npages = (data_len + (PAGE_SIZE - 1)) >> PAGE_SHIFT;
1294 skb->truesize += data_len;
1295 skb_shinfo(skb)->nr_frags = npages;
1296 for (i = 0; i < npages; i++) {
1300 page = alloc_pages(sk->sk_allocation, 0);
1303 skb_shinfo(skb)->nr_frags = i;
1308 frag = &skb_shinfo(skb)->frags[i];
1310 frag->page_offset = 0;
1311 frag->size = (data_len >= PAGE_SIZE ?
1314 data_len -= PAGE_SIZE;
1317 /* Full success... */
1323 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1324 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1328 if (signal_pending(current))
1330 timeo = sock_wait_for_wmem(sk, timeo);
1333 skb_set_owner_w(skb, sk);
1337 err = sock_intr_errno(timeo);
1343 struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size,
1344 int noblock, int *errcode)
1346 return sock_alloc_send_pskb(sk, size, 0, noblock, errcode);
1349 static void __lock_sock(struct sock *sk)
1354 prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait,
1355 TASK_UNINTERRUPTIBLE);
1356 spin_unlock_bh(&sk->sk_lock.slock);
1358 spin_lock_bh(&sk->sk_lock.slock);
1359 if (!sock_owned_by_user(sk))
1362 finish_wait(&sk->sk_lock.wq, &wait);
1365 static void __release_sock(struct sock *sk)
1367 struct sk_buff *skb = sk->sk_backlog.head;
1370 sk->sk_backlog.head = sk->sk_backlog.tail = NULL;
1374 struct sk_buff *next = skb->next;
1377 sk_backlog_rcv(sk, skb);
1380 * We are in process context here with softirqs
1381 * disabled, use cond_resched_softirq() to preempt.
1382 * This is safe to do because we've taken the backlog
1385 cond_resched_softirq();
1388 } while (skb != NULL);
1391 } while ((skb = sk->sk_backlog.head) != NULL);
1395 * sk_wait_data - wait for data to arrive at sk_receive_queue
1396 * @sk: sock to wait on
1397 * @timeo: for how long
1399 * Now socket state including sk->sk_err is changed only under lock,
1400 * hence we may omit checks after joining wait queue.
1401 * We check receive queue before schedule() only as optimization;
1402 * it is very likely that release_sock() added new data.
1404 int sk_wait_data(struct sock *sk, long *timeo)
1409 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
1410 set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
1411 rc = sk_wait_event(sk, timeo, !skb_queue_empty(&sk->sk_receive_queue));
1412 clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
1413 finish_wait(sk->sk_sleep, &wait);
1417 EXPORT_SYMBOL(sk_wait_data);
1420 * __sk_mem_schedule - increase sk_forward_alloc and memory_allocated
1422 * @size: memory size to allocate
1423 * @kind: allocation type
1425 * If kind is SK_MEM_SEND, it means wmem allocation. Otherwise it means
1426 * rmem allocation. This function assumes that protocols which have
1427 * memory_pressure use sk_wmem_queued as write buffer accounting.
1429 int __sk_mem_schedule(struct sock *sk, int size, int kind)
1431 struct proto *prot = sk->sk_prot;
1432 int amt = sk_mem_pages(size);
1435 sk->sk_forward_alloc += amt * SK_MEM_QUANTUM;
1436 allocated = atomic_add_return(amt, prot->memory_allocated);
1439 if (allocated <= prot->sysctl_mem[0]) {
1440 if (prot->memory_pressure && *prot->memory_pressure)
1441 *prot->memory_pressure = 0;
1445 /* Under pressure. */
1446 if (allocated > prot->sysctl_mem[1])
1447 if (prot->enter_memory_pressure)
1448 prot->enter_memory_pressure(sk);
1450 /* Over hard limit. */
1451 if (allocated > prot->sysctl_mem[2])
1452 goto suppress_allocation;
1454 /* guarantee minimum buffer size under pressure */
1455 if (kind == SK_MEM_RECV) {
1456 if (atomic_read(&sk->sk_rmem_alloc) < prot->sysctl_rmem[0])
1458 } else { /* SK_MEM_SEND */
1459 if (sk->sk_type == SOCK_STREAM) {
1460 if (sk->sk_wmem_queued < prot->sysctl_wmem[0])
1462 } else if (atomic_read(&sk->sk_wmem_alloc) <
1463 prot->sysctl_wmem[0])
1467 if (prot->memory_pressure) {
1468 if (!*prot->memory_pressure ||
1469 prot->sysctl_mem[2] > atomic_read(prot->sockets_allocated) *
1470 sk_mem_pages(sk->sk_wmem_queued +
1471 atomic_read(&sk->sk_rmem_alloc) +
1472 sk->sk_forward_alloc))
1476 suppress_allocation:
1478 if (kind == SK_MEM_SEND && sk->sk_type == SOCK_STREAM) {
1479 sk_stream_moderate_sndbuf(sk);
1481 /* Fail only if socket is _under_ its sndbuf.
1482 * In this case we cannot block, so that we have to fail.
1484 if (sk->sk_wmem_queued + size >= sk->sk_sndbuf)
1488 /* Alas. Undo changes. */
1489 sk->sk_forward_alloc -= amt * SK_MEM_QUANTUM;
1490 atomic_sub(amt, prot->memory_allocated);
1494 EXPORT_SYMBOL(__sk_mem_schedule);
1497 * __sk_reclaim - reclaim memory_allocated
1500 void __sk_mem_reclaim(struct sock *sk)
1502 struct proto *prot = sk->sk_prot;
1504 atomic_sub(sk->sk_forward_alloc >> SK_MEM_QUANTUM_SHIFT,
1505 prot->memory_allocated);
1506 sk->sk_forward_alloc &= SK_MEM_QUANTUM - 1;
1508 if (prot->memory_pressure && *prot->memory_pressure &&
1509 (atomic_read(prot->memory_allocated) < prot->sysctl_mem[0]))
1510 *prot->memory_pressure = 0;
1513 EXPORT_SYMBOL(__sk_mem_reclaim);
1517 * Set of default routines for initialising struct proto_ops when
1518 * the protocol does not support a particular function. In certain
1519 * cases where it makes no sense for a protocol to have a "do nothing"
1520 * function, some default processing is provided.
1523 int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len)
1528 int sock_no_connect(struct socket *sock, struct sockaddr *saddr,
1534 int sock_no_socketpair(struct socket *sock1, struct socket *sock2)
1539 int sock_no_accept(struct socket *sock, struct socket *newsock, int flags)
1544 int sock_no_getname(struct socket *sock, struct sockaddr *saddr,
1550 unsigned int sock_no_poll(struct file * file, struct socket *sock, poll_table *pt)
1555 int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1560 int sock_no_listen(struct socket *sock, int backlog)
1565 int sock_no_shutdown(struct socket *sock, int how)
1570 int sock_no_setsockopt(struct socket *sock, int level, int optname,
1571 char __user *optval, int optlen)
1576 int sock_no_getsockopt(struct socket *sock, int level, int optname,
1577 char __user *optval, int __user *optlen)
1582 int sock_no_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
1588 int sock_no_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
1589 size_t len, int flags)
1594 int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma)
1596 /* Mirror missing mmap method error code */
1600 ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags)
1603 struct msghdr msg = {.msg_flags = flags};
1605 char *kaddr = kmap(page);
1606 iov.iov_base = kaddr + offset;
1608 res = kernel_sendmsg(sock, &msg, &iov, 1, size);
1614 * Default Socket Callbacks
1617 static void sock_def_wakeup(struct sock *sk)
1619 read_lock(&sk->sk_callback_lock);
1620 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
1621 wake_up_interruptible_all(sk->sk_sleep);
1622 read_unlock(&sk->sk_callback_lock);
1625 static void sock_def_error_report(struct sock *sk)
1627 read_lock(&sk->sk_callback_lock);
1628 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
1629 wake_up_interruptible(sk->sk_sleep);
1630 sk_wake_async(sk, SOCK_WAKE_IO, POLL_ERR);
1631 read_unlock(&sk->sk_callback_lock);
1634 static void sock_def_readable(struct sock *sk, int len)
1636 read_lock(&sk->sk_callback_lock);
1637 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
1638 wake_up_interruptible_sync(sk->sk_sleep);
1639 sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN);
1640 read_unlock(&sk->sk_callback_lock);
1643 static void sock_def_write_space(struct sock *sk)
1645 read_lock(&sk->sk_callback_lock);
1647 /* Do not wake up a writer until he can make "significant"
1650 if ((atomic_read(&sk->sk_wmem_alloc) << 1) <= sk->sk_sndbuf) {
1651 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
1652 wake_up_interruptible_sync(sk->sk_sleep);
1654 /* Should agree with poll, otherwise some programs break */
1655 if (sock_writeable(sk))
1656 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
1659 read_unlock(&sk->sk_callback_lock);
1662 static void sock_def_destruct(struct sock *sk)
1664 kfree(sk->sk_protinfo);
1667 void sk_send_sigurg(struct sock *sk)
1669 if (sk->sk_socket && sk->sk_socket->file)
1670 if (send_sigurg(&sk->sk_socket->file->f_owner))
1671 sk_wake_async(sk, SOCK_WAKE_URG, POLL_PRI);
1674 void sk_reset_timer(struct sock *sk, struct timer_list* timer,
1675 unsigned long expires)
1677 if (!mod_timer(timer, expires))
1681 EXPORT_SYMBOL(sk_reset_timer);
1683 void sk_stop_timer(struct sock *sk, struct timer_list* timer)
1685 if (timer_pending(timer) && del_timer(timer))
1689 EXPORT_SYMBOL(sk_stop_timer);
1691 void sock_init_data(struct socket *sock, struct sock *sk)
1693 skb_queue_head_init(&sk->sk_receive_queue);
1694 skb_queue_head_init(&sk->sk_write_queue);
1695 skb_queue_head_init(&sk->sk_error_queue);
1696 #ifdef CONFIG_NET_DMA
1697 skb_queue_head_init(&sk->sk_async_wait_queue);
1700 sk->sk_send_head = NULL;
1702 init_timer(&sk->sk_timer);
1704 sk->sk_allocation = GFP_KERNEL;
1705 sk->sk_rcvbuf = sysctl_rmem_default;
1706 sk->sk_sndbuf = sysctl_wmem_default;
1707 sk->sk_state = TCP_CLOSE;
1708 sk_set_socket(sk, sock);
1710 sock_set_flag(sk, SOCK_ZAPPED);
1713 sk->sk_type = sock->type;
1714 sk->sk_sleep = &sock->wait;
1717 sk->sk_sleep = NULL;
1719 rwlock_init(&sk->sk_dst_lock);
1720 rwlock_init(&sk->sk_callback_lock);
1721 lockdep_set_class_and_name(&sk->sk_callback_lock,
1722 af_callback_keys + sk->sk_family,
1723 af_family_clock_key_strings[sk->sk_family]);
1725 sk->sk_state_change = sock_def_wakeup;
1726 sk->sk_data_ready = sock_def_readable;
1727 sk->sk_write_space = sock_def_write_space;
1728 sk->sk_error_report = sock_def_error_report;
1729 sk->sk_destruct = sock_def_destruct;
1731 sk->sk_sndmsg_page = NULL;
1732 sk->sk_sndmsg_off = 0;
1734 sk->sk_peercred.pid = 0;
1735 sk->sk_peercred.uid = -1;
1736 sk->sk_peercred.gid = -1;
1737 sk->sk_write_pending = 0;
1738 sk->sk_rcvlowat = 1;
1739 sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT;
1740 sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT;
1742 sk->sk_stamp = ktime_set(-1L, 0);
1744 atomic_set(&sk->sk_refcnt, 1);
1745 atomic_set(&sk->sk_drops, 0);
1748 void lock_sock_nested(struct sock *sk, int subclass)
1751 spin_lock_bh(&sk->sk_lock.slock);
1752 if (sk->sk_lock.owned)
1754 sk->sk_lock.owned = 1;
1755 spin_unlock(&sk->sk_lock.slock);
1757 * The sk_lock has mutex_lock() semantics here:
1759 mutex_acquire(&sk->sk_lock.dep_map, subclass, 0, _RET_IP_);
1763 EXPORT_SYMBOL(lock_sock_nested);
1765 void release_sock(struct sock *sk)
1768 * The sk_lock has mutex_unlock() semantics:
1770 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_);
1772 spin_lock_bh(&sk->sk_lock.slock);
1773 if (sk->sk_backlog.tail)
1775 sk->sk_lock.owned = 0;
1776 if (waitqueue_active(&sk->sk_lock.wq))
1777 wake_up(&sk->sk_lock.wq);
1778 spin_unlock_bh(&sk->sk_lock.slock);
1780 EXPORT_SYMBOL(release_sock);
1782 int sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp)
1785 if (!sock_flag(sk, SOCK_TIMESTAMP))
1786 sock_enable_timestamp(sk);
1787 tv = ktime_to_timeval(sk->sk_stamp);
1788 if (tv.tv_sec == -1)
1790 if (tv.tv_sec == 0) {
1791 sk->sk_stamp = ktime_get_real();
1792 tv = ktime_to_timeval(sk->sk_stamp);
1794 return copy_to_user(userstamp, &tv, sizeof(tv)) ? -EFAULT : 0;
1796 EXPORT_SYMBOL(sock_get_timestamp);
1798 int sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp)
1801 if (!sock_flag(sk, SOCK_TIMESTAMP))
1802 sock_enable_timestamp(sk);
1803 ts = ktime_to_timespec(sk->sk_stamp);
1804 if (ts.tv_sec == -1)
1806 if (ts.tv_sec == 0) {
1807 sk->sk_stamp = ktime_get_real();
1808 ts = ktime_to_timespec(sk->sk_stamp);
1810 return copy_to_user(userstamp, &ts, sizeof(ts)) ? -EFAULT : 0;
1812 EXPORT_SYMBOL(sock_get_timestampns);
1814 void sock_enable_timestamp(struct sock *sk)
1816 if (!sock_flag(sk, SOCK_TIMESTAMP)) {
1817 sock_set_flag(sk, SOCK_TIMESTAMP);
1818 net_enable_timestamp();
1823 * Get a socket option on an socket.
1825 * FIX: POSIX 1003.1g is very ambiguous here. It states that
1826 * asynchronous errors should be reported by getsockopt. We assume
1827 * this means if you specify SO_ERROR (otherwise whats the point of it).
1829 int sock_common_getsockopt(struct socket *sock, int level, int optname,
1830 char __user *optval, int __user *optlen)
1832 struct sock *sk = sock->sk;
1834 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
1837 EXPORT_SYMBOL(sock_common_getsockopt);
1839 #ifdef CONFIG_COMPAT
1840 int compat_sock_common_getsockopt(struct socket *sock, int level, int optname,
1841 char __user *optval, int __user *optlen)
1843 struct sock *sk = sock->sk;
1845 if (sk->sk_prot->compat_getsockopt != NULL)
1846 return sk->sk_prot->compat_getsockopt(sk, level, optname,
1848 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
1850 EXPORT_SYMBOL(compat_sock_common_getsockopt);
1853 int sock_common_recvmsg(struct kiocb *iocb, struct socket *sock,
1854 struct msghdr *msg, size_t size, int flags)
1856 struct sock *sk = sock->sk;
1860 err = sk->sk_prot->recvmsg(iocb, sk, msg, size, flags & MSG_DONTWAIT,
1861 flags & ~MSG_DONTWAIT, &addr_len);
1863 msg->msg_namelen = addr_len;
1867 EXPORT_SYMBOL(sock_common_recvmsg);
1870 * Set socket options on an inet socket.
1872 int sock_common_setsockopt(struct socket *sock, int level, int optname,
1873 char __user *optval, int optlen)
1875 struct sock *sk = sock->sk;
1877 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
1880 EXPORT_SYMBOL(sock_common_setsockopt);
1882 #ifdef CONFIG_COMPAT
1883 int compat_sock_common_setsockopt(struct socket *sock, int level, int optname,
1884 char __user *optval, int optlen)
1886 struct sock *sk = sock->sk;
1888 if (sk->sk_prot->compat_setsockopt != NULL)
1889 return sk->sk_prot->compat_setsockopt(sk, level, optname,
1891 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
1893 EXPORT_SYMBOL(compat_sock_common_setsockopt);
1896 void sk_common_release(struct sock *sk)
1898 if (sk->sk_prot->destroy)
1899 sk->sk_prot->destroy(sk);
1902 * Observation: when sock_common_release is called, processes have
1903 * no access to socket. But net still has.
1904 * Step one, detach it from networking:
1906 * A. Remove from hash tables.
1909 sk->sk_prot->unhash(sk);
1912 * In this point socket cannot receive new packets, but it is possible
1913 * that some packets are in flight because some CPU runs receiver and
1914 * did hash table lookup before we unhashed socket. They will achieve
1915 * receive queue and will be purged by socket destructor.
1917 * Also we still have packets pending on receive queue and probably,
1918 * our own packets waiting in device queues. sock_destroy will drain
1919 * receive queue, but transmitted packets will delay socket destruction
1920 * until the last reference will be released.
1925 xfrm_sk_free_policy(sk);
1927 sk_refcnt_debug_release(sk);
1931 EXPORT_SYMBOL(sk_common_release);
1933 static DEFINE_RWLOCK(proto_list_lock);
1934 static LIST_HEAD(proto_list);
1936 #ifdef CONFIG_PROC_FS
1937 #define PROTO_INUSE_NR 64 /* should be enough for the first time */
1939 int val[PROTO_INUSE_NR];
1942 static DECLARE_BITMAP(proto_inuse_idx, PROTO_INUSE_NR);
1944 #ifdef CONFIG_NET_NS
1945 void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
1947 int cpu = smp_processor_id();
1948 per_cpu_ptr(net->core.inuse, cpu)->val[prot->inuse_idx] += val;
1950 EXPORT_SYMBOL_GPL(sock_prot_inuse_add);
1952 int sock_prot_inuse_get(struct net *net, struct proto *prot)
1954 int cpu, idx = prot->inuse_idx;
1957 for_each_possible_cpu(cpu)
1958 res += per_cpu_ptr(net->core.inuse, cpu)->val[idx];
1960 return res >= 0 ? res : 0;
1962 EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
1964 static int sock_inuse_init_net(struct net *net)
1966 net->core.inuse = alloc_percpu(struct prot_inuse);
1967 return net->core.inuse ? 0 : -ENOMEM;
1970 static void sock_inuse_exit_net(struct net *net)
1972 free_percpu(net->core.inuse);
1975 static struct pernet_operations net_inuse_ops = {
1976 .init = sock_inuse_init_net,
1977 .exit = sock_inuse_exit_net,
1980 static __init int net_inuse_init(void)
1982 if (register_pernet_subsys(&net_inuse_ops))
1983 panic("Cannot initialize net inuse counters");
1988 core_initcall(net_inuse_init);
1990 static DEFINE_PER_CPU(struct prot_inuse, prot_inuse);
1992 void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
1994 __get_cpu_var(prot_inuse).val[prot->inuse_idx] += val;
1996 EXPORT_SYMBOL_GPL(sock_prot_inuse_add);
1998 int sock_prot_inuse_get(struct net *net, struct proto *prot)
2000 int cpu, idx = prot->inuse_idx;
2003 for_each_possible_cpu(cpu)
2004 res += per_cpu(prot_inuse, cpu).val[idx];
2006 return res >= 0 ? res : 0;
2008 EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
2011 static void assign_proto_idx(struct proto *prot)
2013 prot->inuse_idx = find_first_zero_bit(proto_inuse_idx, PROTO_INUSE_NR);
2015 if (unlikely(prot->inuse_idx == PROTO_INUSE_NR - 1)) {
2016 printk(KERN_ERR "PROTO_INUSE_NR exhausted\n");
2020 set_bit(prot->inuse_idx, proto_inuse_idx);
2023 static void release_proto_idx(struct proto *prot)
2025 if (prot->inuse_idx != PROTO_INUSE_NR - 1)
2026 clear_bit(prot->inuse_idx, proto_inuse_idx);
2029 static inline void assign_proto_idx(struct proto *prot)
2033 static inline void release_proto_idx(struct proto *prot)
2038 int proto_register(struct proto *prot, int alloc_slab)
2040 char *request_sock_slab_name = NULL;
2041 char *timewait_sock_slab_name;
2044 prot->slab = kmem_cache_create(prot->name, prot->obj_size, 0,
2045 SLAB_HWCACHE_ALIGN, NULL);
2047 if (prot->slab == NULL) {
2048 printk(KERN_CRIT "%s: Can't create sock SLAB cache!\n",
2053 if (prot->rsk_prot != NULL) {
2054 static const char mask[] = "request_sock_%s";
2056 request_sock_slab_name = kmalloc(strlen(prot->name) + sizeof(mask) - 1, GFP_KERNEL);
2057 if (request_sock_slab_name == NULL)
2058 goto out_free_sock_slab;
2060 sprintf(request_sock_slab_name, mask, prot->name);
2061 prot->rsk_prot->slab = kmem_cache_create(request_sock_slab_name,
2062 prot->rsk_prot->obj_size, 0,
2063 SLAB_HWCACHE_ALIGN, NULL);
2065 if (prot->rsk_prot->slab == NULL) {
2066 printk(KERN_CRIT "%s: Can't create request sock SLAB cache!\n",
2068 goto out_free_request_sock_slab_name;
2072 if (prot->twsk_prot != NULL) {
2073 static const char mask[] = "tw_sock_%s";
2075 timewait_sock_slab_name = kmalloc(strlen(prot->name) + sizeof(mask) - 1, GFP_KERNEL);
2077 if (timewait_sock_slab_name == NULL)
2078 goto out_free_request_sock_slab;
2080 sprintf(timewait_sock_slab_name, mask, prot->name);
2081 prot->twsk_prot->twsk_slab =
2082 kmem_cache_create(timewait_sock_slab_name,
2083 prot->twsk_prot->twsk_obj_size,
2084 0, SLAB_HWCACHE_ALIGN,
2086 if (prot->twsk_prot->twsk_slab == NULL)
2087 goto out_free_timewait_sock_slab_name;
2091 write_lock(&proto_list_lock);
2092 list_add(&prot->node, &proto_list);
2093 assign_proto_idx(prot);
2094 write_unlock(&proto_list_lock);
2097 out_free_timewait_sock_slab_name:
2098 kfree(timewait_sock_slab_name);
2099 out_free_request_sock_slab:
2100 if (prot->rsk_prot && prot->rsk_prot->slab) {
2101 kmem_cache_destroy(prot->rsk_prot->slab);
2102 prot->rsk_prot->slab = NULL;
2104 out_free_request_sock_slab_name:
2105 kfree(request_sock_slab_name);
2107 kmem_cache_destroy(prot->slab);
2113 EXPORT_SYMBOL(proto_register);
2115 void proto_unregister(struct proto *prot)
2117 write_lock(&proto_list_lock);
2118 release_proto_idx(prot);
2119 list_del(&prot->node);
2120 write_unlock(&proto_list_lock);
2122 if (prot->slab != NULL) {
2123 kmem_cache_destroy(prot->slab);
2127 if (prot->rsk_prot != NULL && prot->rsk_prot->slab != NULL) {
2128 const char *name = kmem_cache_name(prot->rsk_prot->slab);
2130 kmem_cache_destroy(prot->rsk_prot->slab);
2132 prot->rsk_prot->slab = NULL;
2135 if (prot->twsk_prot != NULL && prot->twsk_prot->twsk_slab != NULL) {
2136 const char *name = kmem_cache_name(prot->twsk_prot->twsk_slab);
2138 kmem_cache_destroy(prot->twsk_prot->twsk_slab);
2140 prot->twsk_prot->twsk_slab = NULL;
2144 EXPORT_SYMBOL(proto_unregister);
2146 #ifdef CONFIG_PROC_FS
2147 static void *proto_seq_start(struct seq_file *seq, loff_t *pos)
2148 __acquires(proto_list_lock)
2150 read_lock(&proto_list_lock);
2151 return seq_list_start_head(&proto_list, *pos);
2154 static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2156 return seq_list_next(v, &proto_list, pos);
2159 static void proto_seq_stop(struct seq_file *seq, void *v)
2160 __releases(proto_list_lock)
2162 read_unlock(&proto_list_lock);
2165 static char proto_method_implemented(const void *method)
2167 return method == NULL ? 'n' : 'y';
2170 static void proto_seq_printf(struct seq_file *seq, struct proto *proto)
2172 seq_printf(seq, "%-9s %4u %6d %6d %-3s %6u %-3s %-10s "
2173 "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n",
2176 proto->sockets_allocated != NULL ? atomic_read(proto->sockets_allocated) : -1,
2177 proto->memory_allocated != NULL ? atomic_read(proto->memory_allocated) : -1,
2178 proto->memory_pressure != NULL ? *proto->memory_pressure ? "yes" : "no" : "NI",
2180 proto->slab == NULL ? "no" : "yes",
2181 module_name(proto->owner),
2182 proto_method_implemented(proto->close),
2183 proto_method_implemented(proto->connect),
2184 proto_method_implemented(proto->disconnect),
2185 proto_method_implemented(proto->accept),
2186 proto_method_implemented(proto->ioctl),
2187 proto_method_implemented(proto->init),
2188 proto_method_implemented(proto->destroy),
2189 proto_method_implemented(proto->shutdown),
2190 proto_method_implemented(proto->setsockopt),
2191 proto_method_implemented(proto->getsockopt),
2192 proto_method_implemented(proto->sendmsg),
2193 proto_method_implemented(proto->recvmsg),
2194 proto_method_implemented(proto->sendpage),
2195 proto_method_implemented(proto->bind),
2196 proto_method_implemented(proto->backlog_rcv),
2197 proto_method_implemented(proto->hash),
2198 proto_method_implemented(proto->unhash),
2199 proto_method_implemented(proto->get_port),
2200 proto_method_implemented(proto->enter_memory_pressure));
2203 static int proto_seq_show(struct seq_file *seq, void *v)
2205 if (v == &proto_list)
2206 seq_printf(seq, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s",
2215 "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n");
2217 proto_seq_printf(seq, list_entry(v, struct proto, node));
2221 static const struct seq_operations proto_seq_ops = {
2222 .start = proto_seq_start,
2223 .next = proto_seq_next,
2224 .stop = proto_seq_stop,
2225 .show = proto_seq_show,
2228 static int proto_seq_open(struct inode *inode, struct file *file)
2230 return seq_open(file, &proto_seq_ops);
2233 static const struct file_operations proto_seq_fops = {
2234 .owner = THIS_MODULE,
2235 .open = proto_seq_open,
2237 .llseek = seq_lseek,
2238 .release = seq_release,
2241 static int __init proto_init(void)
2243 /* register /proc/net/protocols */
2244 return proc_net_fops_create(&init_net, "protocols", S_IRUGO, &proto_seq_fops) == NULL ? -ENOBUFS : 0;
2247 subsys_initcall(proto_init);
2249 #endif /* PROC_FS */
2251 EXPORT_SYMBOL(sk_alloc);
2252 EXPORT_SYMBOL(sk_free);
2253 EXPORT_SYMBOL(sk_send_sigurg);
2254 EXPORT_SYMBOL(sock_alloc_send_skb);
2255 EXPORT_SYMBOL(sock_init_data);
2256 EXPORT_SYMBOL(sock_kfree_s);
2257 EXPORT_SYMBOL(sock_kmalloc);
2258 EXPORT_SYMBOL(sock_no_accept);
2259 EXPORT_SYMBOL(sock_no_bind);
2260 EXPORT_SYMBOL(sock_no_connect);
2261 EXPORT_SYMBOL(sock_no_getname);
2262 EXPORT_SYMBOL(sock_no_getsockopt);
2263 EXPORT_SYMBOL(sock_no_ioctl);
2264 EXPORT_SYMBOL(sock_no_listen);
2265 EXPORT_SYMBOL(sock_no_mmap);
2266 EXPORT_SYMBOL(sock_no_poll);
2267 EXPORT_SYMBOL(sock_no_recvmsg);
2268 EXPORT_SYMBOL(sock_no_sendmsg);
2269 EXPORT_SYMBOL(sock_no_sendpage);
2270 EXPORT_SYMBOL(sock_no_setsockopt);
2271 EXPORT_SYMBOL(sock_no_shutdown);
2272 EXPORT_SYMBOL(sock_no_socketpair);
2273 EXPORT_SYMBOL(sock_rfree);
2274 EXPORT_SYMBOL(sock_setsockopt);
2275 EXPORT_SYMBOL(sock_wfree);
2276 EXPORT_SYMBOL(sock_wmalloc);
2277 EXPORT_SYMBOL(sock_i_uid);
2278 EXPORT_SYMBOL(sock_i_ino);
2279 EXPORT_SYMBOL(sysctl_optmem_max);