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];
140 * Make lock validator output more readable. (we pre-construct these
141 * strings build-time, so that runtime initialization of socket
144 static const char *af_family_key_strings[AF_MAX+1] = {
145 "sk_lock-AF_UNSPEC", "sk_lock-AF_UNIX" , "sk_lock-AF_INET" ,
146 "sk_lock-AF_AX25" , "sk_lock-AF_IPX" , "sk_lock-AF_APPLETALK",
147 "sk_lock-AF_NETROM", "sk_lock-AF_BRIDGE" , "sk_lock-AF_ATMPVC" ,
148 "sk_lock-AF_X25" , "sk_lock-AF_INET6" , "sk_lock-AF_ROSE" ,
149 "sk_lock-AF_DECnet", "sk_lock-AF_NETBEUI" , "sk_lock-AF_SECURITY" ,
150 "sk_lock-AF_KEY" , "sk_lock-AF_NETLINK" , "sk_lock-AF_PACKET" ,
151 "sk_lock-AF_ASH" , "sk_lock-AF_ECONET" , "sk_lock-AF_ATMSVC" ,
152 "sk_lock-21" , "sk_lock-AF_SNA" , "sk_lock-AF_IRDA" ,
153 "sk_lock-AF_PPPOX" , "sk_lock-AF_WANPIPE" , "sk_lock-AF_LLC" ,
154 "sk_lock-27" , "sk_lock-28" , "sk_lock-AF_CAN" ,
155 "sk_lock-AF_TIPC" , "sk_lock-AF_BLUETOOTH", "sk_lock-IUCV" ,
156 "sk_lock-AF_RXRPC" , "sk_lock-AF_ISDN" , "sk_lock-AF_PHONET" ,
159 static const char *af_family_slock_key_strings[AF_MAX+1] = {
160 "slock-AF_UNSPEC", "slock-AF_UNIX" , "slock-AF_INET" ,
161 "slock-AF_AX25" , "slock-AF_IPX" , "slock-AF_APPLETALK",
162 "slock-AF_NETROM", "slock-AF_BRIDGE" , "slock-AF_ATMPVC" ,
163 "slock-AF_X25" , "slock-AF_INET6" , "slock-AF_ROSE" ,
164 "slock-AF_DECnet", "slock-AF_NETBEUI" , "slock-AF_SECURITY" ,
165 "slock-AF_KEY" , "slock-AF_NETLINK" , "slock-AF_PACKET" ,
166 "slock-AF_ASH" , "slock-AF_ECONET" , "slock-AF_ATMSVC" ,
167 "slock-21" , "slock-AF_SNA" , "slock-AF_IRDA" ,
168 "slock-AF_PPPOX" , "slock-AF_WANPIPE" , "slock-AF_LLC" ,
169 "slock-27" , "slock-28" , "slock-AF_CAN" ,
170 "slock-AF_TIPC" , "slock-AF_BLUETOOTH", "slock-AF_IUCV" ,
171 "slock-AF_RXRPC" , "slock-AF_ISDN" , "slock-AF_PHONET" ,
174 static const char *af_family_clock_key_strings[AF_MAX+1] = {
175 "clock-AF_UNSPEC", "clock-AF_UNIX" , "clock-AF_INET" ,
176 "clock-AF_AX25" , "clock-AF_IPX" , "clock-AF_APPLETALK",
177 "clock-AF_NETROM", "clock-AF_BRIDGE" , "clock-AF_ATMPVC" ,
178 "clock-AF_X25" , "clock-AF_INET6" , "clock-AF_ROSE" ,
179 "clock-AF_DECnet", "clock-AF_NETBEUI" , "clock-AF_SECURITY" ,
180 "clock-AF_KEY" , "clock-AF_NETLINK" , "clock-AF_PACKET" ,
181 "clock-AF_ASH" , "clock-AF_ECONET" , "clock-AF_ATMSVC" ,
182 "clock-21" , "clock-AF_SNA" , "clock-AF_IRDA" ,
183 "clock-AF_PPPOX" , "clock-AF_WANPIPE" , "clock-AF_LLC" ,
184 "clock-27" , "clock-28" , "clock-AF_CAN" ,
185 "clock-AF_TIPC" , "clock-AF_BLUETOOTH", "clock-AF_IUCV" ,
186 "clock-AF_RXRPC" , "clock-AF_ISDN" , "clock-AF_PHONET" ,
191 * sk_callback_lock locking rules are per-address-family,
192 * so split the lock classes by using a per-AF key:
194 static struct lock_class_key af_callback_keys[AF_MAX];
196 /* Take into consideration the size of the struct sk_buff overhead in the
197 * determination of these values, since that is non-constant across
198 * platforms. This makes socket queueing behavior and performance
199 * not depend upon such differences.
201 #define _SK_MEM_PACKETS 256
202 #define _SK_MEM_OVERHEAD (sizeof(struct sk_buff) + 256)
203 #define SK_WMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS)
204 #define SK_RMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS)
206 /* Run time adjustable parameters. */
207 __u32 sysctl_wmem_max __read_mostly = SK_WMEM_MAX;
208 __u32 sysctl_rmem_max __read_mostly = SK_RMEM_MAX;
209 __u32 sysctl_wmem_default __read_mostly = SK_WMEM_MAX;
210 __u32 sysctl_rmem_default __read_mostly = SK_RMEM_MAX;
212 /* Maximal space eaten by iovec or ancilliary data plus some space */
213 int sysctl_optmem_max __read_mostly = sizeof(unsigned long)*(2*UIO_MAXIOV+512);
215 static int sock_set_timeout(long *timeo_p, char __user *optval, int optlen)
219 if (optlen < sizeof(tv))
221 if (copy_from_user(&tv, optval, sizeof(tv)))
223 if (tv.tv_usec < 0 || tv.tv_usec >= USEC_PER_SEC)
227 static int warned __read_mostly;
230 if (warned < 10 && net_ratelimit()) {
232 printk(KERN_INFO "sock_set_timeout: `%s' (pid %d) "
233 "tries to set negative timeout\n",
234 current->comm, task_pid_nr(current));
238 *timeo_p = MAX_SCHEDULE_TIMEOUT;
239 if (tv.tv_sec == 0 && tv.tv_usec == 0)
241 if (tv.tv_sec < (MAX_SCHEDULE_TIMEOUT/HZ - 1))
242 *timeo_p = tv.tv_sec*HZ + (tv.tv_usec+(1000000/HZ-1))/(1000000/HZ);
246 static void sock_warn_obsolete_bsdism(const char *name)
249 static char warncomm[TASK_COMM_LEN];
250 if (strcmp(warncomm, current->comm) && warned < 5) {
251 strcpy(warncomm, current->comm);
252 printk(KERN_WARNING "process `%s' is using obsolete "
253 "%s SO_BSDCOMPAT\n", warncomm, name);
258 static void sock_disable_timestamp(struct sock *sk)
260 if (sock_flag(sk, SOCK_TIMESTAMP)) {
261 sock_reset_flag(sk, SOCK_TIMESTAMP);
262 net_disable_timestamp();
267 int sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
272 /* Cast sk->rcvbuf to unsigned... It's pointless, but reduces
273 number of warnings when compiling with -W --ANK
275 if (atomic_read(&sk->sk_rmem_alloc) + skb->truesize >=
276 (unsigned)sk->sk_rcvbuf) {
281 err = sk_filter(sk, skb);
285 if (!sk_rmem_schedule(sk, skb->truesize)) {
291 skb_set_owner_r(skb, sk);
293 /* Cache the SKB length before we tack it onto the receive
294 * queue. Once it is added it no longer belongs to us and
295 * may be freed by other threads of control pulling packets
300 skb_queue_tail(&sk->sk_receive_queue, skb);
302 if (!sock_flag(sk, SOCK_DEAD))
303 sk->sk_data_ready(sk, skb_len);
307 EXPORT_SYMBOL(sock_queue_rcv_skb);
309 int sk_receive_skb(struct sock *sk, struct sk_buff *skb, const int nested)
311 int rc = NET_RX_SUCCESS;
313 if (sk_filter(sk, skb))
314 goto discard_and_relse;
319 bh_lock_sock_nested(sk);
322 if (!sock_owned_by_user(sk)) {
324 * trylock + unlock semantics:
326 mutex_acquire(&sk->sk_lock.dep_map, 0, 1, _RET_IP_);
328 rc = sk_backlog_rcv(sk, skb);
330 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_);
332 sk_add_backlog(sk, skb);
341 EXPORT_SYMBOL(sk_receive_skb);
343 struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie)
345 struct dst_entry *dst = sk->sk_dst_cache;
347 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
348 sk->sk_dst_cache = NULL;
355 EXPORT_SYMBOL(__sk_dst_check);
357 struct dst_entry *sk_dst_check(struct sock *sk, u32 cookie)
359 struct dst_entry *dst = sk_dst_get(sk);
361 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
369 EXPORT_SYMBOL(sk_dst_check);
371 static int sock_bindtodevice(struct sock *sk, char __user *optval, int optlen)
373 int ret = -ENOPROTOOPT;
374 #ifdef CONFIG_NETDEVICES
375 struct net *net = sock_net(sk);
376 char devname[IFNAMSIZ];
381 if (!capable(CAP_NET_RAW))
388 /* Bind this socket to a particular device like "eth0",
389 * as specified in the passed interface name. If the
390 * name is "" or the option length is zero the socket
393 if (optlen > IFNAMSIZ - 1)
394 optlen = IFNAMSIZ - 1;
395 memset(devname, 0, sizeof(devname));
398 if (copy_from_user(devname, optval, optlen))
401 if (devname[0] == '\0') {
404 struct net_device *dev = dev_get_by_name(net, devname);
410 index = dev->ifindex;
415 sk->sk_bound_dev_if = index;
427 static inline void sock_valbool_flag(struct sock *sk, int bit, int valbool)
430 sock_set_flag(sk, bit);
432 sock_reset_flag(sk, bit);
436 * This is meant for all protocols to use and covers goings on
437 * at the socket level. Everything here is generic.
440 int sock_setsockopt(struct socket *sock, int level, int optname,
441 char __user *optval, int optlen)
443 struct sock *sk=sock->sk;
450 * Options without arguments
453 if (optname == SO_BINDTODEVICE)
454 return sock_bindtodevice(sk, optval, optlen);
456 if (optlen < sizeof(int))
459 if (get_user(val, (int __user *)optval))
468 if (val && !capable(CAP_NET_ADMIN)) {
471 sock_valbool_flag(sk, SOCK_DBG, valbool);
474 sk->sk_reuse = valbool;
481 sock_valbool_flag(sk, SOCK_LOCALROUTE, valbool);
484 sock_valbool_flag(sk, SOCK_BROADCAST, valbool);
487 /* Don't error on this BSD doesn't and if you think
488 about it this is right. Otherwise apps have to
489 play 'guess the biggest size' games. RCVBUF/SNDBUF
490 are treated in BSD as hints */
492 if (val > sysctl_wmem_max)
493 val = sysctl_wmem_max;
495 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
496 if ((val * 2) < SOCK_MIN_SNDBUF)
497 sk->sk_sndbuf = SOCK_MIN_SNDBUF;
499 sk->sk_sndbuf = val * 2;
502 * Wake up sending tasks if we
505 sk->sk_write_space(sk);
509 if (!capable(CAP_NET_ADMIN)) {
516 /* Don't error on this BSD doesn't and if you think
517 about it this is right. Otherwise apps have to
518 play 'guess the biggest size' games. RCVBUF/SNDBUF
519 are treated in BSD as hints */
521 if (val > sysctl_rmem_max)
522 val = sysctl_rmem_max;
524 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
526 * We double it on the way in to account for
527 * "struct sk_buff" etc. overhead. Applications
528 * assume that the SO_RCVBUF setting they make will
529 * allow that much actual data to be received on that
532 * Applications are unaware that "struct sk_buff" and
533 * other overheads allocate from the receive buffer
534 * during socket buffer allocation.
536 * And after considering the possible alternatives,
537 * returning the value we actually used in getsockopt
538 * is the most desirable behavior.
540 if ((val * 2) < SOCK_MIN_RCVBUF)
541 sk->sk_rcvbuf = SOCK_MIN_RCVBUF;
543 sk->sk_rcvbuf = val * 2;
547 if (!capable(CAP_NET_ADMIN)) {
555 if (sk->sk_protocol == IPPROTO_TCP)
556 tcp_set_keepalive(sk, valbool);
558 sock_valbool_flag(sk, SOCK_KEEPOPEN, valbool);
562 sock_valbool_flag(sk, SOCK_URGINLINE, valbool);
566 sk->sk_no_check = valbool;
570 if ((val >= 0 && val <= 6) || capable(CAP_NET_ADMIN))
571 sk->sk_priority = val;
577 if (optlen < sizeof(ling)) {
578 ret = -EINVAL; /* 1003.1g */
581 if (copy_from_user(&ling,optval,sizeof(ling))) {
586 sock_reset_flag(sk, SOCK_LINGER);
588 #if (BITS_PER_LONG == 32)
589 if ((unsigned int)ling.l_linger >= MAX_SCHEDULE_TIMEOUT/HZ)
590 sk->sk_lingertime = MAX_SCHEDULE_TIMEOUT;
593 sk->sk_lingertime = (unsigned int)ling.l_linger * HZ;
594 sock_set_flag(sk, SOCK_LINGER);
599 sock_warn_obsolete_bsdism("setsockopt");
604 set_bit(SOCK_PASSCRED, &sock->flags);
606 clear_bit(SOCK_PASSCRED, &sock->flags);
612 if (optname == SO_TIMESTAMP)
613 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
615 sock_set_flag(sk, SOCK_RCVTSTAMPNS);
616 sock_set_flag(sk, SOCK_RCVTSTAMP);
617 sock_enable_timestamp(sk);
619 sock_reset_flag(sk, SOCK_RCVTSTAMP);
620 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
627 sk->sk_rcvlowat = val ? : 1;
631 ret = sock_set_timeout(&sk->sk_rcvtimeo, optval, optlen);
635 ret = sock_set_timeout(&sk->sk_sndtimeo, optval, optlen);
638 case SO_ATTACH_FILTER:
640 if (optlen == sizeof(struct sock_fprog)) {
641 struct sock_fprog fprog;
644 if (copy_from_user(&fprog, optval, sizeof(fprog)))
647 ret = sk_attach_filter(&fprog, sk);
651 case SO_DETACH_FILTER:
652 ret = sk_detach_filter(sk);
657 set_bit(SOCK_PASSSEC, &sock->flags);
659 clear_bit(SOCK_PASSSEC, &sock->flags);
662 if (!capable(CAP_NET_ADMIN))
669 /* We implement the SO_SNDLOWAT etc to
670 not be settable (1003.1g 5.3) */
680 int sock_getsockopt(struct socket *sock, int level, int optname,
681 char __user *optval, int __user *optlen)
683 struct sock *sk = sock->sk;
691 unsigned int lv = sizeof(int);
694 if (get_user(len, optlen))
699 memset(&v, 0, sizeof(v));
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 percpu_counter_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 atomic_sub(skb->truesize, &sk->sk_rmem_alloc);
1141 sk_mem_uncharge(skb->sk, skb->truesize);
1145 int sock_i_uid(struct sock *sk)
1149 read_lock(&sk->sk_callback_lock);
1150 uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : 0;
1151 read_unlock(&sk->sk_callback_lock);
1155 unsigned long sock_i_ino(struct sock *sk)
1159 read_lock(&sk->sk_callback_lock);
1160 ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0;
1161 read_unlock(&sk->sk_callback_lock);
1166 * Allocate a skb from the socket's send buffer.
1168 struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force,
1171 if (force || atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
1172 struct sk_buff * skb = alloc_skb(size, priority);
1174 skb_set_owner_w(skb, sk);
1182 * Allocate a skb from the socket's receive buffer.
1184 struct sk_buff *sock_rmalloc(struct sock *sk, unsigned long size, int force,
1187 if (force || atomic_read(&sk->sk_rmem_alloc) < sk->sk_rcvbuf) {
1188 struct sk_buff *skb = alloc_skb(size, priority);
1190 skb_set_owner_r(skb, sk);
1198 * Allocate a memory block from the socket's option memory buffer.
1200 void *sock_kmalloc(struct sock *sk, int size, gfp_t priority)
1202 if ((unsigned)size <= sysctl_optmem_max &&
1203 atomic_read(&sk->sk_omem_alloc) + size < sysctl_optmem_max) {
1205 /* First do the add, to avoid the race if kmalloc
1208 atomic_add(size, &sk->sk_omem_alloc);
1209 mem = kmalloc(size, priority);
1212 atomic_sub(size, &sk->sk_omem_alloc);
1218 * Free an option memory block.
1220 void sock_kfree_s(struct sock *sk, void *mem, int size)
1223 atomic_sub(size, &sk->sk_omem_alloc);
1226 /* It is almost wait_for_tcp_memory minus release_sock/lock_sock.
1227 I think, these locks should be removed for datagram sockets.
1229 static long sock_wait_for_wmem(struct sock * sk, long timeo)
1233 clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1237 if (signal_pending(current))
1239 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1240 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
1241 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf)
1243 if (sk->sk_shutdown & SEND_SHUTDOWN)
1247 timeo = schedule_timeout(timeo);
1249 finish_wait(sk->sk_sleep, &wait);
1255 * Generic send/receive buffer handlers
1258 static struct sk_buff *sock_alloc_send_pskb(struct sock *sk,
1259 unsigned long header_len,
1260 unsigned long data_len,
1261 int noblock, int *errcode)
1263 struct sk_buff *skb;
1268 gfp_mask = sk->sk_allocation;
1269 if (gfp_mask & __GFP_WAIT)
1270 gfp_mask |= __GFP_REPEAT;
1272 timeo = sock_sndtimeo(sk, noblock);
1274 err = sock_error(sk);
1279 if (sk->sk_shutdown & SEND_SHUTDOWN)
1282 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
1283 skb = alloc_skb(header_len, gfp_mask);
1288 /* No pages, we're done... */
1292 npages = (data_len + (PAGE_SIZE - 1)) >> PAGE_SHIFT;
1293 skb->truesize += data_len;
1294 skb_shinfo(skb)->nr_frags = npages;
1295 for (i = 0; i < npages; i++) {
1299 page = alloc_pages(sk->sk_allocation, 0);
1302 skb_shinfo(skb)->nr_frags = i;
1307 frag = &skb_shinfo(skb)->frags[i];
1309 frag->page_offset = 0;
1310 frag->size = (data_len >= PAGE_SIZE ?
1313 data_len -= PAGE_SIZE;
1316 /* Full success... */
1322 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1323 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1327 if (signal_pending(current))
1329 timeo = sock_wait_for_wmem(sk, timeo);
1332 skb_set_owner_w(skb, sk);
1336 err = sock_intr_errno(timeo);
1342 struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size,
1343 int noblock, int *errcode)
1345 return sock_alloc_send_pskb(sk, size, 0, noblock, errcode);
1348 static void __lock_sock(struct sock *sk)
1353 prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait,
1354 TASK_UNINTERRUPTIBLE);
1355 spin_unlock_bh(&sk->sk_lock.slock);
1357 spin_lock_bh(&sk->sk_lock.slock);
1358 if (!sock_owned_by_user(sk))
1361 finish_wait(&sk->sk_lock.wq, &wait);
1364 static void __release_sock(struct sock *sk)
1366 struct sk_buff *skb = sk->sk_backlog.head;
1369 sk->sk_backlog.head = sk->sk_backlog.tail = NULL;
1373 struct sk_buff *next = skb->next;
1376 sk_backlog_rcv(sk, skb);
1379 * We are in process context here with softirqs
1380 * disabled, use cond_resched_softirq() to preempt.
1381 * This is safe to do because we've taken the backlog
1384 cond_resched_softirq();
1387 } while (skb != NULL);
1390 } while ((skb = sk->sk_backlog.head) != NULL);
1394 * sk_wait_data - wait for data to arrive at sk_receive_queue
1395 * @sk: sock to wait on
1396 * @timeo: for how long
1398 * Now socket state including sk->sk_err is changed only under lock,
1399 * hence we may omit checks after joining wait queue.
1400 * We check receive queue before schedule() only as optimization;
1401 * it is very likely that release_sock() added new data.
1403 int sk_wait_data(struct sock *sk, long *timeo)
1408 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
1409 set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
1410 rc = sk_wait_event(sk, timeo, !skb_queue_empty(&sk->sk_receive_queue));
1411 clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
1412 finish_wait(sk->sk_sleep, &wait);
1416 EXPORT_SYMBOL(sk_wait_data);
1419 * __sk_mem_schedule - increase sk_forward_alloc and memory_allocated
1421 * @size: memory size to allocate
1422 * @kind: allocation type
1424 * If kind is SK_MEM_SEND, it means wmem allocation. Otherwise it means
1425 * rmem allocation. This function assumes that protocols which have
1426 * memory_pressure use sk_wmem_queued as write buffer accounting.
1428 int __sk_mem_schedule(struct sock *sk, int size, int kind)
1430 struct proto *prot = sk->sk_prot;
1431 int amt = sk_mem_pages(size);
1434 sk->sk_forward_alloc += amt * SK_MEM_QUANTUM;
1435 allocated = atomic_add_return(amt, prot->memory_allocated);
1438 if (allocated <= prot->sysctl_mem[0]) {
1439 if (prot->memory_pressure && *prot->memory_pressure)
1440 *prot->memory_pressure = 0;
1444 /* Under pressure. */
1445 if (allocated > prot->sysctl_mem[1])
1446 if (prot->enter_memory_pressure)
1447 prot->enter_memory_pressure(sk);
1449 /* Over hard limit. */
1450 if (allocated > prot->sysctl_mem[2])
1451 goto suppress_allocation;
1453 /* guarantee minimum buffer size under pressure */
1454 if (kind == SK_MEM_RECV) {
1455 if (atomic_read(&sk->sk_rmem_alloc) < prot->sysctl_rmem[0])
1457 } else { /* SK_MEM_SEND */
1458 if (sk->sk_type == SOCK_STREAM) {
1459 if (sk->sk_wmem_queued < prot->sysctl_wmem[0])
1461 } else if (atomic_read(&sk->sk_wmem_alloc) <
1462 prot->sysctl_wmem[0])
1466 if (prot->memory_pressure) {
1469 if (!*prot->memory_pressure)
1471 alloc = percpu_counter_read_positive(prot->sockets_allocated);
1472 if (prot->sysctl_mem[2] > alloc *
1473 sk_mem_pages(sk->sk_wmem_queued +
1474 atomic_read(&sk->sk_rmem_alloc) +
1475 sk->sk_forward_alloc))
1479 suppress_allocation:
1481 if (kind == SK_MEM_SEND && sk->sk_type == SOCK_STREAM) {
1482 sk_stream_moderate_sndbuf(sk);
1484 /* Fail only if socket is _under_ its sndbuf.
1485 * In this case we cannot block, so that we have to fail.
1487 if (sk->sk_wmem_queued + size >= sk->sk_sndbuf)
1491 /* Alas. Undo changes. */
1492 sk->sk_forward_alloc -= amt * SK_MEM_QUANTUM;
1493 atomic_sub(amt, prot->memory_allocated);
1497 EXPORT_SYMBOL(__sk_mem_schedule);
1500 * __sk_reclaim - reclaim memory_allocated
1503 void __sk_mem_reclaim(struct sock *sk)
1505 struct proto *prot = sk->sk_prot;
1507 atomic_sub(sk->sk_forward_alloc >> SK_MEM_QUANTUM_SHIFT,
1508 prot->memory_allocated);
1509 sk->sk_forward_alloc &= SK_MEM_QUANTUM - 1;
1511 if (prot->memory_pressure && *prot->memory_pressure &&
1512 (atomic_read(prot->memory_allocated) < prot->sysctl_mem[0]))
1513 *prot->memory_pressure = 0;
1516 EXPORT_SYMBOL(__sk_mem_reclaim);
1520 * Set of default routines for initialising struct proto_ops when
1521 * the protocol does not support a particular function. In certain
1522 * cases where it makes no sense for a protocol to have a "do nothing"
1523 * function, some default processing is provided.
1526 int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len)
1531 int sock_no_connect(struct socket *sock, struct sockaddr *saddr,
1537 int sock_no_socketpair(struct socket *sock1, struct socket *sock2)
1542 int sock_no_accept(struct socket *sock, struct socket *newsock, int flags)
1547 int sock_no_getname(struct socket *sock, struct sockaddr *saddr,
1553 unsigned int sock_no_poll(struct file * file, struct socket *sock, poll_table *pt)
1558 int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1563 int sock_no_listen(struct socket *sock, int backlog)
1568 int sock_no_shutdown(struct socket *sock, int how)
1573 int sock_no_setsockopt(struct socket *sock, int level, int optname,
1574 char __user *optval, int optlen)
1579 int sock_no_getsockopt(struct socket *sock, int level, int optname,
1580 char __user *optval, int __user *optlen)
1585 int sock_no_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
1591 int sock_no_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
1592 size_t len, int flags)
1597 int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma)
1599 /* Mirror missing mmap method error code */
1603 ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags)
1606 struct msghdr msg = {.msg_flags = flags};
1608 char *kaddr = kmap(page);
1609 iov.iov_base = kaddr + offset;
1611 res = kernel_sendmsg(sock, &msg, &iov, 1, size);
1617 * Default Socket Callbacks
1620 static void sock_def_wakeup(struct sock *sk)
1622 read_lock(&sk->sk_callback_lock);
1623 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
1624 wake_up_interruptible_all(sk->sk_sleep);
1625 read_unlock(&sk->sk_callback_lock);
1628 static void sock_def_error_report(struct sock *sk)
1630 read_lock(&sk->sk_callback_lock);
1631 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
1632 wake_up_interruptible(sk->sk_sleep);
1633 sk_wake_async(sk, SOCK_WAKE_IO, POLL_ERR);
1634 read_unlock(&sk->sk_callback_lock);
1637 static void sock_def_readable(struct sock *sk, int len)
1639 read_lock(&sk->sk_callback_lock);
1640 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
1641 wake_up_interruptible_sync(sk->sk_sleep);
1642 sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN);
1643 read_unlock(&sk->sk_callback_lock);
1646 static void sock_def_write_space(struct sock *sk)
1648 read_lock(&sk->sk_callback_lock);
1650 /* Do not wake up a writer until he can make "significant"
1653 if ((atomic_read(&sk->sk_wmem_alloc) << 1) <= sk->sk_sndbuf) {
1654 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
1655 wake_up_interruptible_sync(sk->sk_sleep);
1657 /* Should agree with poll, otherwise some programs break */
1658 if (sock_writeable(sk))
1659 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
1662 read_unlock(&sk->sk_callback_lock);
1665 static void sock_def_destruct(struct sock *sk)
1667 kfree(sk->sk_protinfo);
1670 void sk_send_sigurg(struct sock *sk)
1672 if (sk->sk_socket && sk->sk_socket->file)
1673 if (send_sigurg(&sk->sk_socket->file->f_owner))
1674 sk_wake_async(sk, SOCK_WAKE_URG, POLL_PRI);
1677 void sk_reset_timer(struct sock *sk, struct timer_list* timer,
1678 unsigned long expires)
1680 if (!mod_timer(timer, expires))
1684 EXPORT_SYMBOL(sk_reset_timer);
1686 void sk_stop_timer(struct sock *sk, struct timer_list* timer)
1688 if (timer_pending(timer) && del_timer(timer))
1692 EXPORT_SYMBOL(sk_stop_timer);
1694 void sock_init_data(struct socket *sock, struct sock *sk)
1696 skb_queue_head_init(&sk->sk_receive_queue);
1697 skb_queue_head_init(&sk->sk_write_queue);
1698 skb_queue_head_init(&sk->sk_error_queue);
1699 #ifdef CONFIG_NET_DMA
1700 skb_queue_head_init(&sk->sk_async_wait_queue);
1703 sk->sk_send_head = NULL;
1705 init_timer(&sk->sk_timer);
1707 sk->sk_allocation = GFP_KERNEL;
1708 sk->sk_rcvbuf = sysctl_rmem_default;
1709 sk->sk_sndbuf = sysctl_wmem_default;
1710 sk->sk_state = TCP_CLOSE;
1711 sk_set_socket(sk, sock);
1713 sock_set_flag(sk, SOCK_ZAPPED);
1716 sk->sk_type = sock->type;
1717 sk->sk_sleep = &sock->wait;
1720 sk->sk_sleep = NULL;
1722 rwlock_init(&sk->sk_dst_lock);
1723 rwlock_init(&sk->sk_callback_lock);
1724 lockdep_set_class_and_name(&sk->sk_callback_lock,
1725 af_callback_keys + sk->sk_family,
1726 af_family_clock_key_strings[sk->sk_family]);
1728 sk->sk_state_change = sock_def_wakeup;
1729 sk->sk_data_ready = sock_def_readable;
1730 sk->sk_write_space = sock_def_write_space;
1731 sk->sk_error_report = sock_def_error_report;
1732 sk->sk_destruct = sock_def_destruct;
1734 sk->sk_sndmsg_page = NULL;
1735 sk->sk_sndmsg_off = 0;
1737 sk->sk_peercred.pid = 0;
1738 sk->sk_peercred.uid = -1;
1739 sk->sk_peercred.gid = -1;
1740 sk->sk_write_pending = 0;
1741 sk->sk_rcvlowat = 1;
1742 sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT;
1743 sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT;
1745 sk->sk_stamp = ktime_set(-1L, 0);
1747 atomic_set(&sk->sk_refcnt, 1);
1748 atomic_set(&sk->sk_drops, 0);
1751 void lock_sock_nested(struct sock *sk, int subclass)
1754 spin_lock_bh(&sk->sk_lock.slock);
1755 if (sk->sk_lock.owned)
1757 sk->sk_lock.owned = 1;
1758 spin_unlock(&sk->sk_lock.slock);
1760 * The sk_lock has mutex_lock() semantics here:
1762 mutex_acquire(&sk->sk_lock.dep_map, subclass, 0, _RET_IP_);
1766 EXPORT_SYMBOL(lock_sock_nested);
1768 void release_sock(struct sock *sk)
1771 * The sk_lock has mutex_unlock() semantics:
1773 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_);
1775 spin_lock_bh(&sk->sk_lock.slock);
1776 if (sk->sk_backlog.tail)
1778 sk->sk_lock.owned = 0;
1779 if (waitqueue_active(&sk->sk_lock.wq))
1780 wake_up(&sk->sk_lock.wq);
1781 spin_unlock_bh(&sk->sk_lock.slock);
1783 EXPORT_SYMBOL(release_sock);
1785 int sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp)
1788 if (!sock_flag(sk, SOCK_TIMESTAMP))
1789 sock_enable_timestamp(sk);
1790 tv = ktime_to_timeval(sk->sk_stamp);
1791 if (tv.tv_sec == -1)
1793 if (tv.tv_sec == 0) {
1794 sk->sk_stamp = ktime_get_real();
1795 tv = ktime_to_timeval(sk->sk_stamp);
1797 return copy_to_user(userstamp, &tv, sizeof(tv)) ? -EFAULT : 0;
1799 EXPORT_SYMBOL(sock_get_timestamp);
1801 int sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp)
1804 if (!sock_flag(sk, SOCK_TIMESTAMP))
1805 sock_enable_timestamp(sk);
1806 ts = ktime_to_timespec(sk->sk_stamp);
1807 if (ts.tv_sec == -1)
1809 if (ts.tv_sec == 0) {
1810 sk->sk_stamp = ktime_get_real();
1811 ts = ktime_to_timespec(sk->sk_stamp);
1813 return copy_to_user(userstamp, &ts, sizeof(ts)) ? -EFAULT : 0;
1815 EXPORT_SYMBOL(sock_get_timestampns);
1817 void sock_enable_timestamp(struct sock *sk)
1819 if (!sock_flag(sk, SOCK_TIMESTAMP)) {
1820 sock_set_flag(sk, SOCK_TIMESTAMP);
1821 net_enable_timestamp();
1826 * Get a socket option on an socket.
1828 * FIX: POSIX 1003.1g is very ambiguous here. It states that
1829 * asynchronous errors should be reported by getsockopt. We assume
1830 * this means if you specify SO_ERROR (otherwise whats the point of it).
1832 int sock_common_getsockopt(struct socket *sock, int level, int optname,
1833 char __user *optval, int __user *optlen)
1835 struct sock *sk = sock->sk;
1837 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
1840 EXPORT_SYMBOL(sock_common_getsockopt);
1842 #ifdef CONFIG_COMPAT
1843 int compat_sock_common_getsockopt(struct socket *sock, int level, int optname,
1844 char __user *optval, int __user *optlen)
1846 struct sock *sk = sock->sk;
1848 if (sk->sk_prot->compat_getsockopt != NULL)
1849 return sk->sk_prot->compat_getsockopt(sk, level, optname,
1851 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
1853 EXPORT_SYMBOL(compat_sock_common_getsockopt);
1856 int sock_common_recvmsg(struct kiocb *iocb, struct socket *sock,
1857 struct msghdr *msg, size_t size, int flags)
1859 struct sock *sk = sock->sk;
1863 err = sk->sk_prot->recvmsg(iocb, sk, msg, size, flags & MSG_DONTWAIT,
1864 flags & ~MSG_DONTWAIT, &addr_len);
1866 msg->msg_namelen = addr_len;
1870 EXPORT_SYMBOL(sock_common_recvmsg);
1873 * Set socket options on an inet socket.
1875 int sock_common_setsockopt(struct socket *sock, int level, int optname,
1876 char __user *optval, int optlen)
1878 struct sock *sk = sock->sk;
1880 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
1883 EXPORT_SYMBOL(sock_common_setsockopt);
1885 #ifdef CONFIG_COMPAT
1886 int compat_sock_common_setsockopt(struct socket *sock, int level, int optname,
1887 char __user *optval, int optlen)
1889 struct sock *sk = sock->sk;
1891 if (sk->sk_prot->compat_setsockopt != NULL)
1892 return sk->sk_prot->compat_setsockopt(sk, level, optname,
1894 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
1896 EXPORT_SYMBOL(compat_sock_common_setsockopt);
1899 void sk_common_release(struct sock *sk)
1901 if (sk->sk_prot->destroy)
1902 sk->sk_prot->destroy(sk);
1905 * Observation: when sock_common_release is called, processes have
1906 * no access to socket. But net still has.
1907 * Step one, detach it from networking:
1909 * A. Remove from hash tables.
1912 sk->sk_prot->unhash(sk);
1915 * In this point socket cannot receive new packets, but it is possible
1916 * that some packets are in flight because some CPU runs receiver and
1917 * did hash table lookup before we unhashed socket. They will achieve
1918 * receive queue and will be purged by socket destructor.
1920 * Also we still have packets pending on receive queue and probably,
1921 * our own packets waiting in device queues. sock_destroy will drain
1922 * receive queue, but transmitted packets will delay socket destruction
1923 * until the last reference will be released.
1928 xfrm_sk_free_policy(sk);
1930 sk_refcnt_debug_release(sk);
1934 EXPORT_SYMBOL(sk_common_release);
1936 static DEFINE_RWLOCK(proto_list_lock);
1937 static LIST_HEAD(proto_list);
1939 #ifdef CONFIG_PROC_FS
1940 #define PROTO_INUSE_NR 64 /* should be enough for the first time */
1942 int val[PROTO_INUSE_NR];
1945 static DECLARE_BITMAP(proto_inuse_idx, PROTO_INUSE_NR);
1947 #ifdef CONFIG_NET_NS
1948 void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
1950 int cpu = smp_processor_id();
1951 per_cpu_ptr(net->core.inuse, cpu)->val[prot->inuse_idx] += val;
1953 EXPORT_SYMBOL_GPL(sock_prot_inuse_add);
1955 int sock_prot_inuse_get(struct net *net, struct proto *prot)
1957 int cpu, idx = prot->inuse_idx;
1960 for_each_possible_cpu(cpu)
1961 res += per_cpu_ptr(net->core.inuse, cpu)->val[idx];
1963 return res >= 0 ? res : 0;
1965 EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
1967 static int sock_inuse_init_net(struct net *net)
1969 net->core.inuse = alloc_percpu(struct prot_inuse);
1970 return net->core.inuse ? 0 : -ENOMEM;
1973 static void sock_inuse_exit_net(struct net *net)
1975 free_percpu(net->core.inuse);
1978 static struct pernet_operations net_inuse_ops = {
1979 .init = sock_inuse_init_net,
1980 .exit = sock_inuse_exit_net,
1983 static __init int net_inuse_init(void)
1985 if (register_pernet_subsys(&net_inuse_ops))
1986 panic("Cannot initialize net inuse counters");
1991 core_initcall(net_inuse_init);
1993 static DEFINE_PER_CPU(struct prot_inuse, prot_inuse);
1995 void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
1997 __get_cpu_var(prot_inuse).val[prot->inuse_idx] += val;
1999 EXPORT_SYMBOL_GPL(sock_prot_inuse_add);
2001 int sock_prot_inuse_get(struct net *net, struct proto *prot)
2003 int cpu, idx = prot->inuse_idx;
2006 for_each_possible_cpu(cpu)
2007 res += per_cpu(prot_inuse, cpu).val[idx];
2009 return res >= 0 ? res : 0;
2011 EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
2014 static void assign_proto_idx(struct proto *prot)
2016 prot->inuse_idx = find_first_zero_bit(proto_inuse_idx, PROTO_INUSE_NR);
2018 if (unlikely(prot->inuse_idx == PROTO_INUSE_NR - 1)) {
2019 printk(KERN_ERR "PROTO_INUSE_NR exhausted\n");
2023 set_bit(prot->inuse_idx, proto_inuse_idx);
2026 static void release_proto_idx(struct proto *prot)
2028 if (prot->inuse_idx != PROTO_INUSE_NR - 1)
2029 clear_bit(prot->inuse_idx, proto_inuse_idx);
2032 static inline void assign_proto_idx(struct proto *prot)
2036 static inline void release_proto_idx(struct proto *prot)
2041 int proto_register(struct proto *prot, int alloc_slab)
2044 prot->slab = kmem_cache_create(prot->name, prot->obj_size, 0,
2045 SLAB_HWCACHE_ALIGN | prot->slab_flags,
2048 if (prot->slab == NULL) {
2049 printk(KERN_CRIT "%s: Can't create sock SLAB cache!\n",
2054 if (prot->rsk_prot != NULL) {
2055 static const char mask[] = "request_sock_%s";
2057 prot->rsk_prot->slab_name = kmalloc(strlen(prot->name) + sizeof(mask) - 1, GFP_KERNEL);
2058 if (prot->rsk_prot->slab_name == NULL)
2059 goto out_free_sock_slab;
2061 sprintf(prot->rsk_prot->slab_name, mask, prot->name);
2062 prot->rsk_prot->slab = kmem_cache_create(prot->rsk_prot->slab_name,
2063 prot->rsk_prot->obj_size, 0,
2064 SLAB_HWCACHE_ALIGN, NULL);
2066 if (prot->rsk_prot->slab == NULL) {
2067 printk(KERN_CRIT "%s: Can't create request sock SLAB cache!\n",
2069 goto out_free_request_sock_slab_name;
2073 if (prot->twsk_prot != NULL) {
2074 static const char mask[] = "tw_sock_%s";
2076 prot->twsk_prot->twsk_slab_name = kmalloc(strlen(prot->name) + sizeof(mask) - 1, GFP_KERNEL);
2078 if (prot->twsk_prot->twsk_slab_name == NULL)
2079 goto out_free_request_sock_slab;
2081 sprintf(prot->twsk_prot->twsk_slab_name, mask, prot->name);
2082 prot->twsk_prot->twsk_slab =
2083 kmem_cache_create(prot->twsk_prot->twsk_slab_name,
2084 prot->twsk_prot->twsk_obj_size,
2086 SLAB_HWCACHE_ALIGN |
2089 if (prot->twsk_prot->twsk_slab == NULL)
2090 goto out_free_timewait_sock_slab_name;
2094 write_lock(&proto_list_lock);
2095 list_add(&prot->node, &proto_list);
2096 assign_proto_idx(prot);
2097 write_unlock(&proto_list_lock);
2100 out_free_timewait_sock_slab_name:
2101 kfree(prot->twsk_prot->twsk_slab_name);
2102 out_free_request_sock_slab:
2103 if (prot->rsk_prot && prot->rsk_prot->slab) {
2104 kmem_cache_destroy(prot->rsk_prot->slab);
2105 prot->rsk_prot->slab = NULL;
2107 out_free_request_sock_slab_name:
2108 kfree(prot->rsk_prot->slab_name);
2110 kmem_cache_destroy(prot->slab);
2116 EXPORT_SYMBOL(proto_register);
2118 void proto_unregister(struct proto *prot)
2120 write_lock(&proto_list_lock);
2121 release_proto_idx(prot);
2122 list_del(&prot->node);
2123 write_unlock(&proto_list_lock);
2125 if (prot->slab != NULL) {
2126 kmem_cache_destroy(prot->slab);
2130 if (prot->rsk_prot != NULL && prot->rsk_prot->slab != NULL) {
2131 kmem_cache_destroy(prot->rsk_prot->slab);
2132 kfree(prot->rsk_prot->slab_name);
2133 prot->rsk_prot->slab = NULL;
2136 if (prot->twsk_prot != NULL && prot->twsk_prot->twsk_slab != NULL) {
2137 kmem_cache_destroy(prot->twsk_prot->twsk_slab);
2138 kfree(prot->twsk_prot->twsk_slab_name);
2139 prot->twsk_prot->twsk_slab = NULL;
2143 EXPORT_SYMBOL(proto_unregister);
2145 #ifdef CONFIG_PROC_FS
2146 static void *proto_seq_start(struct seq_file *seq, loff_t *pos)
2147 __acquires(proto_list_lock)
2149 read_lock(&proto_list_lock);
2150 return seq_list_start_head(&proto_list, *pos);
2153 static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2155 return seq_list_next(v, &proto_list, pos);
2158 static void proto_seq_stop(struct seq_file *seq, void *v)
2159 __releases(proto_list_lock)
2161 read_unlock(&proto_list_lock);
2164 static char proto_method_implemented(const void *method)
2166 return method == NULL ? 'n' : 'y';
2169 static void proto_seq_printf(struct seq_file *seq, struct proto *proto)
2171 seq_printf(seq, "%-9s %4u %6d %6d %-3s %6u %-3s %-10s "
2172 "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n",
2175 sock_prot_inuse_get(seq_file_net(seq), proto),
2176 proto->memory_allocated != NULL ? atomic_read(proto->memory_allocated) : -1,
2177 proto->memory_pressure != NULL ? *proto->memory_pressure ? "yes" : "no" : "NI",
2179 proto->slab == NULL ? "no" : "yes",
2180 module_name(proto->owner),
2181 proto_method_implemented(proto->close),
2182 proto_method_implemented(proto->connect),
2183 proto_method_implemented(proto->disconnect),
2184 proto_method_implemented(proto->accept),
2185 proto_method_implemented(proto->ioctl),
2186 proto_method_implemented(proto->init),
2187 proto_method_implemented(proto->destroy),
2188 proto_method_implemented(proto->shutdown),
2189 proto_method_implemented(proto->setsockopt),
2190 proto_method_implemented(proto->getsockopt),
2191 proto_method_implemented(proto->sendmsg),
2192 proto_method_implemented(proto->recvmsg),
2193 proto_method_implemented(proto->sendpage),
2194 proto_method_implemented(proto->bind),
2195 proto_method_implemented(proto->backlog_rcv),
2196 proto_method_implemented(proto->hash),
2197 proto_method_implemented(proto->unhash),
2198 proto_method_implemented(proto->get_port),
2199 proto_method_implemented(proto->enter_memory_pressure));
2202 static int proto_seq_show(struct seq_file *seq, void *v)
2204 if (v == &proto_list)
2205 seq_printf(seq, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s",
2214 "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n");
2216 proto_seq_printf(seq, list_entry(v, struct proto, node));
2220 static const struct seq_operations proto_seq_ops = {
2221 .start = proto_seq_start,
2222 .next = proto_seq_next,
2223 .stop = proto_seq_stop,
2224 .show = proto_seq_show,
2227 static int proto_seq_open(struct inode *inode, struct file *file)
2229 return seq_open_net(inode, file, &proto_seq_ops,
2230 sizeof(struct seq_net_private));
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_net,
2241 static __net_init int proto_init_net(struct net *net)
2243 if (!proc_net_fops_create(net, "protocols", S_IRUGO, &proto_seq_fops))
2249 static __net_exit void proto_exit_net(struct net *net)
2251 proc_net_remove(net, "protocols");
2255 static __net_initdata struct pernet_operations proto_net_ops = {
2256 .init = proto_init_net,
2257 .exit = proto_exit_net,
2260 static int __init proto_init(void)
2262 return register_pernet_subsys(&proto_net_ops);
2265 subsys_initcall(proto_init);
2267 #endif /* PROC_FS */
2269 EXPORT_SYMBOL(sk_alloc);
2270 EXPORT_SYMBOL(sk_free);
2271 EXPORT_SYMBOL(sk_send_sigurg);
2272 EXPORT_SYMBOL(sock_alloc_send_skb);
2273 EXPORT_SYMBOL(sock_init_data);
2274 EXPORT_SYMBOL(sock_kfree_s);
2275 EXPORT_SYMBOL(sock_kmalloc);
2276 EXPORT_SYMBOL(sock_no_accept);
2277 EXPORT_SYMBOL(sock_no_bind);
2278 EXPORT_SYMBOL(sock_no_connect);
2279 EXPORT_SYMBOL(sock_no_getname);
2280 EXPORT_SYMBOL(sock_no_getsockopt);
2281 EXPORT_SYMBOL(sock_no_ioctl);
2282 EXPORT_SYMBOL(sock_no_listen);
2283 EXPORT_SYMBOL(sock_no_mmap);
2284 EXPORT_SYMBOL(sock_no_poll);
2285 EXPORT_SYMBOL(sock_no_recvmsg);
2286 EXPORT_SYMBOL(sock_no_sendmsg);
2287 EXPORT_SYMBOL(sock_no_sendpage);
2288 EXPORT_SYMBOL(sock_no_setsockopt);
2289 EXPORT_SYMBOL(sock_no_shutdown);
2290 EXPORT_SYMBOL(sock_no_socketpair);
2291 EXPORT_SYMBOL(sock_rfree);
2292 EXPORT_SYMBOL(sock_setsockopt);
2293 EXPORT_SYMBOL(sock_wfree);
2294 EXPORT_SYMBOL(sock_wmalloc);
2295 EXPORT_SYMBOL(sock_i_uid);
2296 EXPORT_SYMBOL(sock_i_ino);
2297 EXPORT_SYMBOL(sysctl_optmem_max);