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 <linux/net_tstamp.h>
124 #include <net/xfrm.h>
125 #include <linux/ipsec.h>
127 #include <linux/filter.h>
134 * Each address family might have different locking rules, so we have
135 * one slock key per address family:
137 static struct lock_class_key af_family_keys[AF_MAX];
138 static struct lock_class_key af_family_slock_keys[AF_MAX];
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-AF_RDS" , "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-AF_RDS" , "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-AF_RDS" , "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" ,
192 * sk_callback_lock locking rules are per-address-family,
193 * so split the lock classes by using a per-AF key:
195 static struct lock_class_key af_callback_keys[AF_MAX];
197 /* Take into consideration the size of the struct sk_buff overhead in the
198 * determination of these values, since that is non-constant across
199 * platforms. This makes socket queueing behavior and performance
200 * not depend upon such differences.
202 #define _SK_MEM_PACKETS 256
203 #define _SK_MEM_OVERHEAD (sizeof(struct sk_buff) + 256)
204 #define SK_WMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS)
205 #define SK_RMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS)
207 /* Run time adjustable parameters. */
208 __u32 sysctl_wmem_max __read_mostly = SK_WMEM_MAX;
209 __u32 sysctl_rmem_max __read_mostly = SK_RMEM_MAX;
210 __u32 sysctl_wmem_default __read_mostly = SK_WMEM_MAX;
211 __u32 sysctl_rmem_default __read_mostly = SK_RMEM_MAX;
213 /* Maximal space eaten by iovec or ancilliary data plus some space */
214 int sysctl_optmem_max __read_mostly = sizeof(unsigned long)*(2*UIO_MAXIOV+512);
216 static int sock_set_timeout(long *timeo_p, char __user *optval, int optlen)
220 if (optlen < sizeof(tv))
222 if (copy_from_user(&tv, optval, sizeof(tv)))
224 if (tv.tv_usec < 0 || tv.tv_usec >= USEC_PER_SEC)
228 static int warned __read_mostly;
231 if (warned < 10 && net_ratelimit()) {
233 printk(KERN_INFO "sock_set_timeout: `%s' (pid %d) "
234 "tries to set negative timeout\n",
235 current->comm, task_pid_nr(current));
239 *timeo_p = MAX_SCHEDULE_TIMEOUT;
240 if (tv.tv_sec == 0 && tv.tv_usec == 0)
242 if (tv.tv_sec < (MAX_SCHEDULE_TIMEOUT/HZ - 1))
243 *timeo_p = tv.tv_sec*HZ + (tv.tv_usec+(1000000/HZ-1))/(1000000/HZ);
247 static void sock_warn_obsolete_bsdism(const char *name)
250 static char warncomm[TASK_COMM_LEN];
251 if (strcmp(warncomm, current->comm) && warned < 5) {
252 strcpy(warncomm, current->comm);
253 printk(KERN_WARNING "process `%s' is using obsolete "
254 "%s SO_BSDCOMPAT\n", warncomm, name);
259 static void sock_disable_timestamp(struct sock *sk, int flag)
261 if (sock_flag(sk, flag)) {
262 sock_reset_flag(sk, flag);
263 if (!sock_flag(sk, SOCK_TIMESTAMP) &&
264 !sock_flag(sk, SOCK_TIMESTAMPING_RX_SOFTWARE)) {
265 net_disable_timestamp();
271 int sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
276 /* Cast sk->rcvbuf to unsigned... It's pointless, but reduces
277 number of warnings when compiling with -W --ANK
279 if (atomic_read(&sk->sk_rmem_alloc) + skb->truesize >=
280 (unsigned)sk->sk_rcvbuf) {
285 err = sk_filter(sk, skb);
289 if (!sk_rmem_schedule(sk, skb->truesize)) {
295 skb_set_owner_r(skb, sk);
297 /* Cache the SKB length before we tack it onto the receive
298 * queue. Once it is added it no longer belongs to us and
299 * may be freed by other threads of control pulling packets
304 skb_queue_tail(&sk->sk_receive_queue, skb);
306 if (!sock_flag(sk, SOCK_DEAD))
307 sk->sk_data_ready(sk, skb_len);
311 EXPORT_SYMBOL(sock_queue_rcv_skb);
313 int sk_receive_skb(struct sock *sk, struct sk_buff *skb, const int nested)
315 int rc = NET_RX_SUCCESS;
317 if (sk_filter(sk, skb))
318 goto discard_and_relse;
323 bh_lock_sock_nested(sk);
326 if (!sock_owned_by_user(sk)) {
328 * trylock + unlock semantics:
330 mutex_acquire(&sk->sk_lock.dep_map, 0, 1, _RET_IP_);
332 rc = sk_backlog_rcv(sk, skb);
334 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_);
336 sk_add_backlog(sk, skb);
345 EXPORT_SYMBOL(sk_receive_skb);
347 struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie)
349 struct dst_entry *dst = sk->sk_dst_cache;
351 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
352 sk->sk_dst_cache = NULL;
359 EXPORT_SYMBOL(__sk_dst_check);
361 struct dst_entry *sk_dst_check(struct sock *sk, u32 cookie)
363 struct dst_entry *dst = sk_dst_get(sk);
365 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
373 EXPORT_SYMBOL(sk_dst_check);
375 static int sock_bindtodevice(struct sock *sk, char __user *optval, int optlen)
377 int ret = -ENOPROTOOPT;
378 #ifdef CONFIG_NETDEVICES
379 struct net *net = sock_net(sk);
380 char devname[IFNAMSIZ];
385 if (!capable(CAP_NET_RAW))
392 /* Bind this socket to a particular device like "eth0",
393 * as specified in the passed interface name. If the
394 * name is "" or the option length is zero the socket
397 if (optlen > IFNAMSIZ - 1)
398 optlen = IFNAMSIZ - 1;
399 memset(devname, 0, sizeof(devname));
402 if (copy_from_user(devname, optval, optlen))
405 if (devname[0] == '\0') {
408 struct net_device *dev = dev_get_by_name(net, devname);
414 index = dev->ifindex;
419 sk->sk_bound_dev_if = index;
431 static inline void sock_valbool_flag(struct sock *sk, int bit, int valbool)
434 sock_set_flag(sk, bit);
436 sock_reset_flag(sk, bit);
440 * This is meant for all protocols to use and covers goings on
441 * at the socket level. Everything here is generic.
444 int sock_setsockopt(struct socket *sock, int level, int optname,
445 char __user *optval, int optlen)
447 struct sock *sk=sock->sk;
454 * Options without arguments
457 if (optname == SO_BINDTODEVICE)
458 return sock_bindtodevice(sk, optval, optlen);
460 if (optlen < sizeof(int))
463 if (get_user(val, (int __user *)optval))
472 if (val && !capable(CAP_NET_ADMIN)) {
475 sock_valbool_flag(sk, SOCK_DBG, valbool);
478 sk->sk_reuse = valbool;
485 sock_valbool_flag(sk, SOCK_LOCALROUTE, valbool);
488 sock_valbool_flag(sk, SOCK_BROADCAST, valbool);
491 /* Don't error on this BSD doesn't and if you think
492 about it this is right. Otherwise apps have to
493 play 'guess the biggest size' games. RCVBUF/SNDBUF
494 are treated in BSD as hints */
496 if (val > sysctl_wmem_max)
497 val = sysctl_wmem_max;
499 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
500 if ((val * 2) < SOCK_MIN_SNDBUF)
501 sk->sk_sndbuf = SOCK_MIN_SNDBUF;
503 sk->sk_sndbuf = val * 2;
506 * Wake up sending tasks if we
509 sk->sk_write_space(sk);
513 if (!capable(CAP_NET_ADMIN)) {
520 /* Don't error on this BSD doesn't and if you think
521 about it this is right. Otherwise apps have to
522 play 'guess the biggest size' games. RCVBUF/SNDBUF
523 are treated in BSD as hints */
525 if (val > sysctl_rmem_max)
526 val = sysctl_rmem_max;
528 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
530 * We double it on the way in to account for
531 * "struct sk_buff" etc. overhead. Applications
532 * assume that the SO_RCVBUF setting they make will
533 * allow that much actual data to be received on that
536 * Applications are unaware that "struct sk_buff" and
537 * other overheads allocate from the receive buffer
538 * during socket buffer allocation.
540 * And after considering the possible alternatives,
541 * returning the value we actually used in getsockopt
542 * is the most desirable behavior.
544 if ((val * 2) < SOCK_MIN_RCVBUF)
545 sk->sk_rcvbuf = SOCK_MIN_RCVBUF;
547 sk->sk_rcvbuf = val * 2;
551 if (!capable(CAP_NET_ADMIN)) {
559 if (sk->sk_protocol == IPPROTO_TCP)
560 tcp_set_keepalive(sk, valbool);
562 sock_valbool_flag(sk, SOCK_KEEPOPEN, valbool);
566 sock_valbool_flag(sk, SOCK_URGINLINE, valbool);
570 sk->sk_no_check = valbool;
574 if ((val >= 0 && val <= 6) || capable(CAP_NET_ADMIN))
575 sk->sk_priority = val;
581 if (optlen < sizeof(ling)) {
582 ret = -EINVAL; /* 1003.1g */
585 if (copy_from_user(&ling,optval,sizeof(ling))) {
590 sock_reset_flag(sk, SOCK_LINGER);
592 #if (BITS_PER_LONG == 32)
593 if ((unsigned int)ling.l_linger >= MAX_SCHEDULE_TIMEOUT/HZ)
594 sk->sk_lingertime = MAX_SCHEDULE_TIMEOUT;
597 sk->sk_lingertime = (unsigned int)ling.l_linger * HZ;
598 sock_set_flag(sk, SOCK_LINGER);
603 sock_warn_obsolete_bsdism("setsockopt");
608 set_bit(SOCK_PASSCRED, &sock->flags);
610 clear_bit(SOCK_PASSCRED, &sock->flags);
616 if (optname == SO_TIMESTAMP)
617 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
619 sock_set_flag(sk, SOCK_RCVTSTAMPNS);
620 sock_set_flag(sk, SOCK_RCVTSTAMP);
621 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
623 sock_reset_flag(sk, SOCK_RCVTSTAMP);
624 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
628 case SO_TIMESTAMPING:
629 if (val & ~SOF_TIMESTAMPING_MASK) {
633 sock_valbool_flag(sk, SOCK_TIMESTAMPING_TX_HARDWARE,
634 val & SOF_TIMESTAMPING_TX_HARDWARE);
635 sock_valbool_flag(sk, SOCK_TIMESTAMPING_TX_SOFTWARE,
636 val & SOF_TIMESTAMPING_TX_SOFTWARE);
637 sock_valbool_flag(sk, SOCK_TIMESTAMPING_RX_HARDWARE,
638 val & SOF_TIMESTAMPING_RX_HARDWARE);
639 if (val & SOF_TIMESTAMPING_RX_SOFTWARE)
640 sock_enable_timestamp(sk,
641 SOCK_TIMESTAMPING_RX_SOFTWARE);
643 sock_disable_timestamp(sk,
644 SOCK_TIMESTAMPING_RX_SOFTWARE);
645 sock_valbool_flag(sk, SOCK_TIMESTAMPING_SOFTWARE,
646 val & SOF_TIMESTAMPING_SOFTWARE);
647 sock_valbool_flag(sk, SOCK_TIMESTAMPING_SYS_HARDWARE,
648 val & SOF_TIMESTAMPING_SYS_HARDWARE);
649 sock_valbool_flag(sk, SOCK_TIMESTAMPING_RAW_HARDWARE,
650 val & SOF_TIMESTAMPING_RAW_HARDWARE);
656 sk->sk_rcvlowat = val ? : 1;
660 ret = sock_set_timeout(&sk->sk_rcvtimeo, optval, optlen);
664 ret = sock_set_timeout(&sk->sk_sndtimeo, optval, optlen);
667 case SO_ATTACH_FILTER:
669 if (optlen == sizeof(struct sock_fprog)) {
670 struct sock_fprog fprog;
673 if (copy_from_user(&fprog, optval, sizeof(fprog)))
676 ret = sk_attach_filter(&fprog, sk);
680 case SO_DETACH_FILTER:
681 ret = sk_detach_filter(sk);
686 set_bit(SOCK_PASSSEC, &sock->flags);
688 clear_bit(SOCK_PASSSEC, &sock->flags);
691 if (!capable(CAP_NET_ADMIN))
698 /* We implement the SO_SNDLOWAT etc to
699 not be settable (1003.1g 5.3) */
709 int sock_getsockopt(struct socket *sock, int level, int optname,
710 char __user *optval, int __user *optlen)
712 struct sock *sk = sock->sk;
720 unsigned int lv = sizeof(int);
723 if (get_user(len, optlen))
728 memset(&v, 0, sizeof(v));
732 v.val = sock_flag(sk, SOCK_DBG);
736 v.val = sock_flag(sk, SOCK_LOCALROUTE);
740 v.val = !!sock_flag(sk, SOCK_BROADCAST);
744 v.val = sk->sk_sndbuf;
748 v.val = sk->sk_rcvbuf;
752 v.val = sk->sk_reuse;
756 v.val = !!sock_flag(sk, SOCK_KEEPOPEN);
764 v.val = -sock_error(sk);
766 v.val = xchg(&sk->sk_err_soft, 0);
770 v.val = !!sock_flag(sk, SOCK_URGINLINE);
774 v.val = sk->sk_no_check;
778 v.val = sk->sk_priority;
783 v.ling.l_onoff = !!sock_flag(sk, SOCK_LINGER);
784 v.ling.l_linger = sk->sk_lingertime / HZ;
788 sock_warn_obsolete_bsdism("getsockopt");
792 v.val = sock_flag(sk, SOCK_RCVTSTAMP) &&
793 !sock_flag(sk, SOCK_RCVTSTAMPNS);
797 v.val = sock_flag(sk, SOCK_RCVTSTAMPNS);
800 case SO_TIMESTAMPING:
802 if (sock_flag(sk, SOCK_TIMESTAMPING_TX_HARDWARE))
803 v.val |= SOF_TIMESTAMPING_TX_HARDWARE;
804 if (sock_flag(sk, SOCK_TIMESTAMPING_TX_SOFTWARE))
805 v.val |= SOF_TIMESTAMPING_TX_SOFTWARE;
806 if (sock_flag(sk, SOCK_TIMESTAMPING_RX_HARDWARE))
807 v.val |= SOF_TIMESTAMPING_RX_HARDWARE;
808 if (sock_flag(sk, SOCK_TIMESTAMPING_RX_SOFTWARE))
809 v.val |= SOF_TIMESTAMPING_RX_SOFTWARE;
810 if (sock_flag(sk, SOCK_TIMESTAMPING_SOFTWARE))
811 v.val |= SOF_TIMESTAMPING_SOFTWARE;
812 if (sock_flag(sk, SOCK_TIMESTAMPING_SYS_HARDWARE))
813 v.val |= SOF_TIMESTAMPING_SYS_HARDWARE;
814 if (sock_flag(sk, SOCK_TIMESTAMPING_RAW_HARDWARE))
815 v.val |= SOF_TIMESTAMPING_RAW_HARDWARE;
819 lv=sizeof(struct timeval);
820 if (sk->sk_rcvtimeo == MAX_SCHEDULE_TIMEOUT) {
824 v.tm.tv_sec = sk->sk_rcvtimeo / HZ;
825 v.tm.tv_usec = ((sk->sk_rcvtimeo % HZ) * 1000000) / HZ;
830 lv=sizeof(struct timeval);
831 if (sk->sk_sndtimeo == MAX_SCHEDULE_TIMEOUT) {
835 v.tm.tv_sec = sk->sk_sndtimeo / HZ;
836 v.tm.tv_usec = ((sk->sk_sndtimeo % HZ) * 1000000) / HZ;
841 v.val = sk->sk_rcvlowat;
849 v.val = test_bit(SOCK_PASSCRED, &sock->flags) ? 1 : 0;
853 if (len > sizeof(sk->sk_peercred))
854 len = sizeof(sk->sk_peercred);
855 if (copy_to_user(optval, &sk->sk_peercred, len))
863 if (sock->ops->getname(sock, (struct sockaddr *)address, &lv, 2))
867 if (copy_to_user(optval, address, len))
872 /* Dubious BSD thing... Probably nobody even uses it, but
873 * the UNIX standard wants it for whatever reason... -DaveM
876 v.val = sk->sk_state == TCP_LISTEN;
880 v.val = test_bit(SOCK_PASSSEC, &sock->flags) ? 1 : 0;
884 return security_socket_getpeersec_stream(sock, optval, optlen, len);
896 if (copy_to_user(optval, &v, len))
899 if (put_user(len, optlen))
905 * Initialize an sk_lock.
907 * (We also register the sk_lock with the lock validator.)
909 static inline void sock_lock_init(struct sock *sk)
911 sock_lock_init_class_and_name(sk,
912 af_family_slock_key_strings[sk->sk_family],
913 af_family_slock_keys + sk->sk_family,
914 af_family_key_strings[sk->sk_family],
915 af_family_keys + sk->sk_family);
918 static void sock_copy(struct sock *nsk, const struct sock *osk)
920 #ifdef CONFIG_SECURITY_NETWORK
921 void *sptr = nsk->sk_security;
924 memcpy(nsk, osk, osk->sk_prot->obj_size);
925 #ifdef CONFIG_SECURITY_NETWORK
926 nsk->sk_security = sptr;
927 security_sk_clone(osk, nsk);
931 static struct sock *sk_prot_alloc(struct proto *prot, gfp_t priority,
935 struct kmem_cache *slab;
939 sk = kmem_cache_alloc(slab, priority);
941 sk = kmalloc(prot->obj_size, priority);
944 kmemcheck_annotate_bitfield(sk, flags);
946 if (security_sk_alloc(sk, family, priority))
949 if (!try_module_get(prot->owner))
956 security_sk_free(sk);
959 kmem_cache_free(slab, sk);
965 static void sk_prot_free(struct proto *prot, struct sock *sk)
967 struct kmem_cache *slab;
968 struct module *owner;
973 security_sk_free(sk);
975 kmem_cache_free(slab, sk);
982 * sk_alloc - All socket objects are allocated here
983 * @net: the applicable net namespace
984 * @family: protocol family
985 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
986 * @prot: struct proto associated with this new sock instance
988 struct sock *sk_alloc(struct net *net, int family, gfp_t priority,
993 sk = sk_prot_alloc(prot, priority | __GFP_ZERO, family);
995 sk->sk_family = family;
997 * See comment in struct sock definition to understand
998 * why we need sk_prot_creator -acme
1000 sk->sk_prot = sk->sk_prot_creator = prot;
1002 sock_net_set(sk, get_net(net));
1008 void sk_free(struct sock *sk)
1010 struct sk_filter *filter;
1012 if (sk->sk_destruct)
1013 sk->sk_destruct(sk);
1015 filter = rcu_dereference(sk->sk_filter);
1017 sk_filter_uncharge(sk, filter);
1018 rcu_assign_pointer(sk->sk_filter, NULL);
1021 sock_disable_timestamp(sk, SOCK_TIMESTAMP);
1022 sock_disable_timestamp(sk, SOCK_TIMESTAMPING_RX_SOFTWARE);
1024 if (atomic_read(&sk->sk_omem_alloc))
1025 printk(KERN_DEBUG "%s: optmem leakage (%d bytes) detected.\n",
1026 __func__, atomic_read(&sk->sk_omem_alloc));
1028 put_net(sock_net(sk));
1029 sk_prot_free(sk->sk_prot_creator, sk);
1033 * Last sock_put should drop referrence to sk->sk_net. It has already
1034 * been dropped in sk_change_net. Taking referrence to stopping namespace
1036 * Take referrence to a socket to remove it from hash _alive_ and after that
1037 * destroy it in the context of init_net.
1039 void sk_release_kernel(struct sock *sk)
1041 if (sk == NULL || sk->sk_socket == NULL)
1045 sock_release(sk->sk_socket);
1046 release_net(sock_net(sk));
1047 sock_net_set(sk, get_net(&init_net));
1050 EXPORT_SYMBOL(sk_release_kernel);
1052 struct sock *sk_clone(const struct sock *sk, const gfp_t priority)
1056 newsk = sk_prot_alloc(sk->sk_prot, priority, sk->sk_family);
1057 if (newsk != NULL) {
1058 struct sk_filter *filter;
1060 sock_copy(newsk, sk);
1063 get_net(sock_net(newsk));
1064 sk_node_init(&newsk->sk_node);
1065 sock_lock_init(newsk);
1066 bh_lock_sock(newsk);
1067 newsk->sk_backlog.head = newsk->sk_backlog.tail = NULL;
1069 atomic_set(&newsk->sk_rmem_alloc, 0);
1070 atomic_set(&newsk->sk_wmem_alloc, 0);
1071 atomic_set(&newsk->sk_omem_alloc, 0);
1072 skb_queue_head_init(&newsk->sk_receive_queue);
1073 skb_queue_head_init(&newsk->sk_write_queue);
1074 #ifdef CONFIG_NET_DMA
1075 skb_queue_head_init(&newsk->sk_async_wait_queue);
1078 rwlock_init(&newsk->sk_dst_lock);
1079 rwlock_init(&newsk->sk_callback_lock);
1080 lockdep_set_class_and_name(&newsk->sk_callback_lock,
1081 af_callback_keys + newsk->sk_family,
1082 af_family_clock_key_strings[newsk->sk_family]);
1084 newsk->sk_dst_cache = NULL;
1085 newsk->sk_wmem_queued = 0;
1086 newsk->sk_forward_alloc = 0;
1087 newsk->sk_send_head = NULL;
1088 newsk->sk_userlocks = sk->sk_userlocks & ~SOCK_BINDPORT_LOCK;
1090 sock_reset_flag(newsk, SOCK_DONE);
1091 skb_queue_head_init(&newsk->sk_error_queue);
1093 filter = newsk->sk_filter;
1095 sk_filter_charge(newsk, filter);
1097 if (unlikely(xfrm_sk_clone_policy(newsk))) {
1098 /* It is still raw copy of parent, so invalidate
1099 * destructor and make plain sk_free() */
1100 newsk->sk_destruct = NULL;
1107 newsk->sk_priority = 0;
1108 atomic_set(&newsk->sk_refcnt, 2);
1111 * Increment the counter in the same struct proto as the master
1112 * sock (sk_refcnt_debug_inc uses newsk->sk_prot->socks, that
1113 * is the same as sk->sk_prot->socks, as this field was copied
1116 * This _changes_ the previous behaviour, where
1117 * tcp_create_openreq_child always was incrementing the
1118 * equivalent to tcp_prot->socks (inet_sock_nr), so this have
1119 * to be taken into account in all callers. -acme
1121 sk_refcnt_debug_inc(newsk);
1122 sk_set_socket(newsk, NULL);
1123 newsk->sk_sleep = NULL;
1125 if (newsk->sk_prot->sockets_allocated)
1126 percpu_counter_inc(newsk->sk_prot->sockets_allocated);
1132 EXPORT_SYMBOL_GPL(sk_clone);
1134 void sk_setup_caps(struct sock *sk, struct dst_entry *dst)
1136 __sk_dst_set(sk, dst);
1137 sk->sk_route_caps = dst->dev->features;
1138 if (sk->sk_route_caps & NETIF_F_GSO)
1139 sk->sk_route_caps |= NETIF_F_GSO_SOFTWARE;
1140 if (sk_can_gso(sk)) {
1141 if (dst->header_len) {
1142 sk->sk_route_caps &= ~NETIF_F_GSO_MASK;
1144 sk->sk_route_caps |= NETIF_F_SG | NETIF_F_HW_CSUM;
1145 sk->sk_gso_max_size = dst->dev->gso_max_size;
1149 EXPORT_SYMBOL_GPL(sk_setup_caps);
1151 void __init sk_init(void)
1153 if (num_physpages <= 4096) {
1154 sysctl_wmem_max = 32767;
1155 sysctl_rmem_max = 32767;
1156 sysctl_wmem_default = 32767;
1157 sysctl_rmem_default = 32767;
1158 } else if (num_physpages >= 131072) {
1159 sysctl_wmem_max = 131071;
1160 sysctl_rmem_max = 131071;
1165 * Simple resource managers for sockets.
1170 * Write buffer destructor automatically called from kfree_skb.
1172 void sock_wfree(struct sk_buff *skb)
1174 struct sock *sk = skb->sk;
1176 /* In case it might be waiting for more memory. */
1177 atomic_sub(skb->truesize, &sk->sk_wmem_alloc);
1178 if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE))
1179 sk->sk_write_space(sk);
1184 * Read buffer destructor automatically called from kfree_skb.
1186 void sock_rfree(struct sk_buff *skb)
1188 struct sock *sk = skb->sk;
1190 atomic_sub(skb->truesize, &sk->sk_rmem_alloc);
1191 sk_mem_uncharge(skb->sk, skb->truesize);
1195 int sock_i_uid(struct sock *sk)
1199 read_lock(&sk->sk_callback_lock);
1200 uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : 0;
1201 read_unlock(&sk->sk_callback_lock);
1205 unsigned long sock_i_ino(struct sock *sk)
1209 read_lock(&sk->sk_callback_lock);
1210 ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0;
1211 read_unlock(&sk->sk_callback_lock);
1216 * Allocate a skb from the socket's send buffer.
1218 struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force,
1221 if (force || atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
1222 struct sk_buff * skb = alloc_skb(size, priority);
1224 skb_set_owner_w(skb, sk);
1232 * Allocate a skb from the socket's receive buffer.
1234 struct sk_buff *sock_rmalloc(struct sock *sk, unsigned long size, int force,
1237 if (force || atomic_read(&sk->sk_rmem_alloc) < sk->sk_rcvbuf) {
1238 struct sk_buff *skb = alloc_skb(size, priority);
1240 skb_set_owner_r(skb, sk);
1248 * Allocate a memory block from the socket's option memory buffer.
1250 void *sock_kmalloc(struct sock *sk, int size, gfp_t priority)
1252 if ((unsigned)size <= sysctl_optmem_max &&
1253 atomic_read(&sk->sk_omem_alloc) + size < sysctl_optmem_max) {
1255 /* First do the add, to avoid the race if kmalloc
1258 atomic_add(size, &sk->sk_omem_alloc);
1259 mem = kmalloc(size, priority);
1262 atomic_sub(size, &sk->sk_omem_alloc);
1268 * Free an option memory block.
1270 void sock_kfree_s(struct sock *sk, void *mem, int size)
1273 atomic_sub(size, &sk->sk_omem_alloc);
1276 /* It is almost wait_for_tcp_memory minus release_sock/lock_sock.
1277 I think, these locks should be removed for datagram sockets.
1279 static long sock_wait_for_wmem(struct sock * sk, long timeo)
1283 clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1287 if (signal_pending(current))
1289 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1290 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
1291 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf)
1293 if (sk->sk_shutdown & SEND_SHUTDOWN)
1297 timeo = schedule_timeout(timeo);
1299 finish_wait(sk->sk_sleep, &wait);
1305 * Generic send/receive buffer handlers
1308 struct sk_buff *sock_alloc_send_pskb(struct sock *sk, unsigned long header_len,
1309 unsigned long data_len, int noblock,
1312 struct sk_buff *skb;
1317 gfp_mask = sk->sk_allocation;
1318 if (gfp_mask & __GFP_WAIT)
1319 gfp_mask |= __GFP_REPEAT;
1321 timeo = sock_sndtimeo(sk, noblock);
1323 err = sock_error(sk);
1328 if (sk->sk_shutdown & SEND_SHUTDOWN)
1331 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
1332 skb = alloc_skb(header_len, gfp_mask);
1337 /* No pages, we're done... */
1341 npages = (data_len + (PAGE_SIZE - 1)) >> PAGE_SHIFT;
1342 skb->truesize += data_len;
1343 skb_shinfo(skb)->nr_frags = npages;
1344 for (i = 0; i < npages; i++) {
1348 page = alloc_pages(sk->sk_allocation, 0);
1351 skb_shinfo(skb)->nr_frags = i;
1356 frag = &skb_shinfo(skb)->frags[i];
1358 frag->page_offset = 0;
1359 frag->size = (data_len >= PAGE_SIZE ?
1362 data_len -= PAGE_SIZE;
1365 /* Full success... */
1371 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1372 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1376 if (signal_pending(current))
1378 timeo = sock_wait_for_wmem(sk, timeo);
1381 skb_set_owner_w(skb, sk);
1385 err = sock_intr_errno(timeo);
1390 EXPORT_SYMBOL(sock_alloc_send_pskb);
1392 struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size,
1393 int noblock, int *errcode)
1395 return sock_alloc_send_pskb(sk, size, 0, noblock, errcode);
1398 static void __lock_sock(struct sock *sk)
1403 prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait,
1404 TASK_UNINTERRUPTIBLE);
1405 spin_unlock_bh(&sk->sk_lock.slock);
1407 spin_lock_bh(&sk->sk_lock.slock);
1408 if (!sock_owned_by_user(sk))
1411 finish_wait(&sk->sk_lock.wq, &wait);
1414 static void __release_sock(struct sock *sk)
1416 struct sk_buff *skb = sk->sk_backlog.head;
1419 sk->sk_backlog.head = sk->sk_backlog.tail = NULL;
1423 struct sk_buff *next = skb->next;
1426 sk_backlog_rcv(sk, skb);
1429 * We are in process context here with softirqs
1430 * disabled, use cond_resched_softirq() to preempt.
1431 * This is safe to do because we've taken the backlog
1434 cond_resched_softirq();
1437 } while (skb != NULL);
1440 } while ((skb = sk->sk_backlog.head) != NULL);
1444 * sk_wait_data - wait for data to arrive at sk_receive_queue
1445 * @sk: sock to wait on
1446 * @timeo: for how long
1448 * Now socket state including sk->sk_err is changed only under lock,
1449 * hence we may omit checks after joining wait queue.
1450 * We check receive queue before schedule() only as optimization;
1451 * it is very likely that release_sock() added new data.
1453 int sk_wait_data(struct sock *sk, long *timeo)
1458 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
1459 set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
1460 rc = sk_wait_event(sk, timeo, !skb_queue_empty(&sk->sk_receive_queue));
1461 clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
1462 finish_wait(sk->sk_sleep, &wait);
1466 EXPORT_SYMBOL(sk_wait_data);
1469 * __sk_mem_schedule - increase sk_forward_alloc and memory_allocated
1471 * @size: memory size to allocate
1472 * @kind: allocation type
1474 * If kind is SK_MEM_SEND, it means wmem allocation. Otherwise it means
1475 * rmem allocation. This function assumes that protocols which have
1476 * memory_pressure use sk_wmem_queued as write buffer accounting.
1478 int __sk_mem_schedule(struct sock *sk, int size, int kind)
1480 struct proto *prot = sk->sk_prot;
1481 int amt = sk_mem_pages(size);
1484 sk->sk_forward_alloc += amt * SK_MEM_QUANTUM;
1485 allocated = atomic_add_return(amt, prot->memory_allocated);
1488 if (allocated <= prot->sysctl_mem[0]) {
1489 if (prot->memory_pressure && *prot->memory_pressure)
1490 *prot->memory_pressure = 0;
1494 /* Under pressure. */
1495 if (allocated > prot->sysctl_mem[1])
1496 if (prot->enter_memory_pressure)
1497 prot->enter_memory_pressure(sk);
1499 /* Over hard limit. */
1500 if (allocated > prot->sysctl_mem[2])
1501 goto suppress_allocation;
1503 /* guarantee minimum buffer size under pressure */
1504 if (kind == SK_MEM_RECV) {
1505 if (atomic_read(&sk->sk_rmem_alloc) < prot->sysctl_rmem[0])
1507 } else { /* SK_MEM_SEND */
1508 if (sk->sk_type == SOCK_STREAM) {
1509 if (sk->sk_wmem_queued < prot->sysctl_wmem[0])
1511 } else if (atomic_read(&sk->sk_wmem_alloc) <
1512 prot->sysctl_wmem[0])
1516 if (prot->memory_pressure) {
1519 if (!*prot->memory_pressure)
1521 alloc = percpu_counter_read_positive(prot->sockets_allocated);
1522 if (prot->sysctl_mem[2] > alloc *
1523 sk_mem_pages(sk->sk_wmem_queued +
1524 atomic_read(&sk->sk_rmem_alloc) +
1525 sk->sk_forward_alloc))
1529 suppress_allocation:
1531 if (kind == SK_MEM_SEND && sk->sk_type == SOCK_STREAM) {
1532 sk_stream_moderate_sndbuf(sk);
1534 /* Fail only if socket is _under_ its sndbuf.
1535 * In this case we cannot block, so that we have to fail.
1537 if (sk->sk_wmem_queued + size >= sk->sk_sndbuf)
1541 /* Alas. Undo changes. */
1542 sk->sk_forward_alloc -= amt * SK_MEM_QUANTUM;
1543 atomic_sub(amt, prot->memory_allocated);
1547 EXPORT_SYMBOL(__sk_mem_schedule);
1550 * __sk_reclaim - reclaim memory_allocated
1553 void __sk_mem_reclaim(struct sock *sk)
1555 struct proto *prot = sk->sk_prot;
1557 atomic_sub(sk->sk_forward_alloc >> SK_MEM_QUANTUM_SHIFT,
1558 prot->memory_allocated);
1559 sk->sk_forward_alloc &= SK_MEM_QUANTUM - 1;
1561 if (prot->memory_pressure && *prot->memory_pressure &&
1562 (atomic_read(prot->memory_allocated) < prot->sysctl_mem[0]))
1563 *prot->memory_pressure = 0;
1566 EXPORT_SYMBOL(__sk_mem_reclaim);
1570 * Set of default routines for initialising struct proto_ops when
1571 * the protocol does not support a particular function. In certain
1572 * cases where it makes no sense for a protocol to have a "do nothing"
1573 * function, some default processing is provided.
1576 int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len)
1581 int sock_no_connect(struct socket *sock, struct sockaddr *saddr,
1587 int sock_no_socketpair(struct socket *sock1, struct socket *sock2)
1592 int sock_no_accept(struct socket *sock, struct socket *newsock, int flags)
1597 int sock_no_getname(struct socket *sock, struct sockaddr *saddr,
1603 unsigned int sock_no_poll(struct file * file, struct socket *sock, poll_table *pt)
1608 int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1613 int sock_no_listen(struct socket *sock, int backlog)
1618 int sock_no_shutdown(struct socket *sock, int how)
1623 int sock_no_setsockopt(struct socket *sock, int level, int optname,
1624 char __user *optval, int optlen)
1629 int sock_no_getsockopt(struct socket *sock, int level, int optname,
1630 char __user *optval, int __user *optlen)
1635 int sock_no_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
1641 int sock_no_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
1642 size_t len, int flags)
1647 int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma)
1649 /* Mirror missing mmap method error code */
1653 ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags)
1656 struct msghdr msg = {.msg_flags = flags};
1658 char *kaddr = kmap(page);
1659 iov.iov_base = kaddr + offset;
1661 res = kernel_sendmsg(sock, &msg, &iov, 1, size);
1667 * Default Socket Callbacks
1670 static void sock_def_wakeup(struct sock *sk)
1672 read_lock(&sk->sk_callback_lock);
1673 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
1674 wake_up_interruptible_all(sk->sk_sleep);
1675 read_unlock(&sk->sk_callback_lock);
1678 static void sock_def_error_report(struct sock *sk)
1680 read_lock(&sk->sk_callback_lock);
1681 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
1682 wake_up_interruptible_poll(sk->sk_sleep, POLLERR);
1683 sk_wake_async(sk, SOCK_WAKE_IO, POLL_ERR);
1684 read_unlock(&sk->sk_callback_lock);
1687 static void sock_def_readable(struct sock *sk, int len)
1689 read_lock(&sk->sk_callback_lock);
1690 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
1691 wake_up_interruptible_sync_poll(sk->sk_sleep, POLLIN |
1692 POLLRDNORM | POLLRDBAND);
1693 sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN);
1694 read_unlock(&sk->sk_callback_lock);
1697 static void sock_def_write_space(struct sock *sk)
1699 read_lock(&sk->sk_callback_lock);
1701 /* Do not wake up a writer until he can make "significant"
1704 if ((atomic_read(&sk->sk_wmem_alloc) << 1) <= sk->sk_sndbuf) {
1705 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
1706 wake_up_interruptible_sync_poll(sk->sk_sleep, POLLOUT |
1707 POLLWRNORM | POLLWRBAND);
1709 /* Should agree with poll, otherwise some programs break */
1710 if (sock_writeable(sk))
1711 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
1714 read_unlock(&sk->sk_callback_lock);
1717 static void sock_def_destruct(struct sock *sk)
1719 kfree(sk->sk_protinfo);
1722 void sk_send_sigurg(struct sock *sk)
1724 if (sk->sk_socket && sk->sk_socket->file)
1725 if (send_sigurg(&sk->sk_socket->file->f_owner))
1726 sk_wake_async(sk, SOCK_WAKE_URG, POLL_PRI);
1729 void sk_reset_timer(struct sock *sk, struct timer_list* timer,
1730 unsigned long expires)
1732 if (!mod_timer(timer, expires))
1736 EXPORT_SYMBOL(sk_reset_timer);
1738 void sk_stop_timer(struct sock *sk, struct timer_list* timer)
1740 if (timer_pending(timer) && del_timer(timer))
1744 EXPORT_SYMBOL(sk_stop_timer);
1746 void sock_init_data(struct socket *sock, struct sock *sk)
1748 skb_queue_head_init(&sk->sk_receive_queue);
1749 skb_queue_head_init(&sk->sk_write_queue);
1750 skb_queue_head_init(&sk->sk_error_queue);
1751 #ifdef CONFIG_NET_DMA
1752 skb_queue_head_init(&sk->sk_async_wait_queue);
1755 sk->sk_send_head = NULL;
1757 init_timer(&sk->sk_timer);
1759 sk->sk_allocation = GFP_KERNEL;
1760 sk->sk_rcvbuf = sysctl_rmem_default;
1761 sk->sk_sndbuf = sysctl_wmem_default;
1762 sk->sk_state = TCP_CLOSE;
1763 sk_set_socket(sk, sock);
1765 sock_set_flag(sk, SOCK_ZAPPED);
1768 sk->sk_type = sock->type;
1769 sk->sk_sleep = &sock->wait;
1772 sk->sk_sleep = NULL;
1774 rwlock_init(&sk->sk_dst_lock);
1775 rwlock_init(&sk->sk_callback_lock);
1776 lockdep_set_class_and_name(&sk->sk_callback_lock,
1777 af_callback_keys + sk->sk_family,
1778 af_family_clock_key_strings[sk->sk_family]);
1780 sk->sk_state_change = sock_def_wakeup;
1781 sk->sk_data_ready = sock_def_readable;
1782 sk->sk_write_space = sock_def_write_space;
1783 sk->sk_error_report = sock_def_error_report;
1784 sk->sk_destruct = sock_def_destruct;
1786 sk->sk_sndmsg_page = NULL;
1787 sk->sk_sndmsg_off = 0;
1789 sk->sk_peercred.pid = 0;
1790 sk->sk_peercred.uid = -1;
1791 sk->sk_peercred.gid = -1;
1792 sk->sk_write_pending = 0;
1793 sk->sk_rcvlowat = 1;
1794 sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT;
1795 sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT;
1797 sk->sk_stamp = ktime_set(-1L, 0);
1799 atomic_set(&sk->sk_refcnt, 1);
1800 atomic_set(&sk->sk_drops, 0);
1803 void lock_sock_nested(struct sock *sk, int subclass)
1806 spin_lock_bh(&sk->sk_lock.slock);
1807 if (sk->sk_lock.owned)
1809 sk->sk_lock.owned = 1;
1810 spin_unlock(&sk->sk_lock.slock);
1812 * The sk_lock has mutex_lock() semantics here:
1814 mutex_acquire(&sk->sk_lock.dep_map, subclass, 0, _RET_IP_);
1818 EXPORT_SYMBOL(lock_sock_nested);
1820 void release_sock(struct sock *sk)
1823 * The sk_lock has mutex_unlock() semantics:
1825 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_);
1827 spin_lock_bh(&sk->sk_lock.slock);
1828 if (sk->sk_backlog.tail)
1830 sk->sk_lock.owned = 0;
1831 if (waitqueue_active(&sk->sk_lock.wq))
1832 wake_up(&sk->sk_lock.wq);
1833 spin_unlock_bh(&sk->sk_lock.slock);
1835 EXPORT_SYMBOL(release_sock);
1837 int sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp)
1840 if (!sock_flag(sk, SOCK_TIMESTAMP))
1841 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
1842 tv = ktime_to_timeval(sk->sk_stamp);
1843 if (tv.tv_sec == -1)
1845 if (tv.tv_sec == 0) {
1846 sk->sk_stamp = ktime_get_real();
1847 tv = ktime_to_timeval(sk->sk_stamp);
1849 return copy_to_user(userstamp, &tv, sizeof(tv)) ? -EFAULT : 0;
1851 EXPORT_SYMBOL(sock_get_timestamp);
1853 int sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp)
1856 if (!sock_flag(sk, SOCK_TIMESTAMP))
1857 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
1858 ts = ktime_to_timespec(sk->sk_stamp);
1859 if (ts.tv_sec == -1)
1861 if (ts.tv_sec == 0) {
1862 sk->sk_stamp = ktime_get_real();
1863 ts = ktime_to_timespec(sk->sk_stamp);
1865 return copy_to_user(userstamp, &ts, sizeof(ts)) ? -EFAULT : 0;
1867 EXPORT_SYMBOL(sock_get_timestampns);
1869 void sock_enable_timestamp(struct sock *sk, int flag)
1871 if (!sock_flag(sk, flag)) {
1872 sock_set_flag(sk, flag);
1874 * we just set one of the two flags which require net
1875 * time stamping, but time stamping might have been on
1876 * already because of the other one
1879 flag == SOCK_TIMESTAMP ?
1880 SOCK_TIMESTAMPING_RX_SOFTWARE :
1882 net_enable_timestamp();
1887 * Get a socket option on an socket.
1889 * FIX: POSIX 1003.1g is very ambiguous here. It states that
1890 * asynchronous errors should be reported by getsockopt. We assume
1891 * this means if you specify SO_ERROR (otherwise whats the point of it).
1893 int sock_common_getsockopt(struct socket *sock, int level, int optname,
1894 char __user *optval, int __user *optlen)
1896 struct sock *sk = sock->sk;
1898 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
1901 EXPORT_SYMBOL(sock_common_getsockopt);
1903 #ifdef CONFIG_COMPAT
1904 int compat_sock_common_getsockopt(struct socket *sock, int level, int optname,
1905 char __user *optval, int __user *optlen)
1907 struct sock *sk = sock->sk;
1909 if (sk->sk_prot->compat_getsockopt != NULL)
1910 return sk->sk_prot->compat_getsockopt(sk, level, optname,
1912 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
1914 EXPORT_SYMBOL(compat_sock_common_getsockopt);
1917 int sock_common_recvmsg(struct kiocb *iocb, struct socket *sock,
1918 struct msghdr *msg, size_t size, int flags)
1920 struct sock *sk = sock->sk;
1924 err = sk->sk_prot->recvmsg(iocb, sk, msg, size, flags & MSG_DONTWAIT,
1925 flags & ~MSG_DONTWAIT, &addr_len);
1927 msg->msg_namelen = addr_len;
1931 EXPORT_SYMBOL(sock_common_recvmsg);
1934 * Set socket options on an inet socket.
1936 int sock_common_setsockopt(struct socket *sock, int level, int optname,
1937 char __user *optval, int optlen)
1939 struct sock *sk = sock->sk;
1941 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
1944 EXPORT_SYMBOL(sock_common_setsockopt);
1946 #ifdef CONFIG_COMPAT
1947 int compat_sock_common_setsockopt(struct socket *sock, int level, int optname,
1948 char __user *optval, int optlen)
1950 struct sock *sk = sock->sk;
1952 if (sk->sk_prot->compat_setsockopt != NULL)
1953 return sk->sk_prot->compat_setsockopt(sk, level, optname,
1955 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
1957 EXPORT_SYMBOL(compat_sock_common_setsockopt);
1960 void sk_common_release(struct sock *sk)
1962 if (sk->sk_prot->destroy)
1963 sk->sk_prot->destroy(sk);
1966 * Observation: when sock_common_release is called, processes have
1967 * no access to socket. But net still has.
1968 * Step one, detach it from networking:
1970 * A. Remove from hash tables.
1973 sk->sk_prot->unhash(sk);
1976 * In this point socket cannot receive new packets, but it is possible
1977 * that some packets are in flight because some CPU runs receiver and
1978 * did hash table lookup before we unhashed socket. They will achieve
1979 * receive queue and will be purged by socket destructor.
1981 * Also we still have packets pending on receive queue and probably,
1982 * our own packets waiting in device queues. sock_destroy will drain
1983 * receive queue, but transmitted packets will delay socket destruction
1984 * until the last reference will be released.
1989 xfrm_sk_free_policy(sk);
1991 sk_refcnt_debug_release(sk);
1995 EXPORT_SYMBOL(sk_common_release);
1997 static DEFINE_RWLOCK(proto_list_lock);
1998 static LIST_HEAD(proto_list);
2000 #ifdef CONFIG_PROC_FS
2001 #define PROTO_INUSE_NR 64 /* should be enough for the first time */
2003 int val[PROTO_INUSE_NR];
2006 static DECLARE_BITMAP(proto_inuse_idx, PROTO_INUSE_NR);
2008 #ifdef CONFIG_NET_NS
2009 void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
2011 int cpu = smp_processor_id();
2012 per_cpu_ptr(net->core.inuse, cpu)->val[prot->inuse_idx] += val;
2014 EXPORT_SYMBOL_GPL(sock_prot_inuse_add);
2016 int sock_prot_inuse_get(struct net *net, struct proto *prot)
2018 int cpu, idx = prot->inuse_idx;
2021 for_each_possible_cpu(cpu)
2022 res += per_cpu_ptr(net->core.inuse, cpu)->val[idx];
2024 return res >= 0 ? res : 0;
2026 EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
2028 static int sock_inuse_init_net(struct net *net)
2030 net->core.inuse = alloc_percpu(struct prot_inuse);
2031 return net->core.inuse ? 0 : -ENOMEM;
2034 static void sock_inuse_exit_net(struct net *net)
2036 free_percpu(net->core.inuse);
2039 static struct pernet_operations net_inuse_ops = {
2040 .init = sock_inuse_init_net,
2041 .exit = sock_inuse_exit_net,
2044 static __init int net_inuse_init(void)
2046 if (register_pernet_subsys(&net_inuse_ops))
2047 panic("Cannot initialize net inuse counters");
2052 core_initcall(net_inuse_init);
2054 static DEFINE_PER_CPU(struct prot_inuse, prot_inuse);
2056 void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
2058 __get_cpu_var(prot_inuse).val[prot->inuse_idx] += val;
2060 EXPORT_SYMBOL_GPL(sock_prot_inuse_add);
2062 int sock_prot_inuse_get(struct net *net, struct proto *prot)
2064 int cpu, idx = prot->inuse_idx;
2067 for_each_possible_cpu(cpu)
2068 res += per_cpu(prot_inuse, cpu).val[idx];
2070 return res >= 0 ? res : 0;
2072 EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
2075 static void assign_proto_idx(struct proto *prot)
2077 prot->inuse_idx = find_first_zero_bit(proto_inuse_idx, PROTO_INUSE_NR);
2079 if (unlikely(prot->inuse_idx == PROTO_INUSE_NR - 1)) {
2080 printk(KERN_ERR "PROTO_INUSE_NR exhausted\n");
2084 set_bit(prot->inuse_idx, proto_inuse_idx);
2087 static void release_proto_idx(struct proto *prot)
2089 if (prot->inuse_idx != PROTO_INUSE_NR - 1)
2090 clear_bit(prot->inuse_idx, proto_inuse_idx);
2093 static inline void assign_proto_idx(struct proto *prot)
2097 static inline void release_proto_idx(struct proto *prot)
2102 int proto_register(struct proto *prot, int alloc_slab)
2105 prot->slab = kmem_cache_create(prot->name, prot->obj_size, 0,
2106 SLAB_HWCACHE_ALIGN | prot->slab_flags,
2109 if (prot->slab == NULL) {
2110 printk(KERN_CRIT "%s: Can't create sock SLAB cache!\n",
2115 if (prot->rsk_prot != NULL) {
2116 static const char mask[] = "request_sock_%s";
2118 prot->rsk_prot->slab_name = kmalloc(strlen(prot->name) + sizeof(mask) - 1, GFP_KERNEL);
2119 if (prot->rsk_prot->slab_name == NULL)
2120 goto out_free_sock_slab;
2122 sprintf(prot->rsk_prot->slab_name, mask, prot->name);
2123 prot->rsk_prot->slab = kmem_cache_create(prot->rsk_prot->slab_name,
2124 prot->rsk_prot->obj_size, 0,
2125 SLAB_HWCACHE_ALIGN, NULL);
2127 if (prot->rsk_prot->slab == NULL) {
2128 printk(KERN_CRIT "%s: Can't create request sock SLAB cache!\n",
2130 goto out_free_request_sock_slab_name;
2134 if (prot->twsk_prot != NULL) {
2135 static const char mask[] = "tw_sock_%s";
2137 prot->twsk_prot->twsk_slab_name = kmalloc(strlen(prot->name) + sizeof(mask) - 1, GFP_KERNEL);
2139 if (prot->twsk_prot->twsk_slab_name == NULL)
2140 goto out_free_request_sock_slab;
2142 sprintf(prot->twsk_prot->twsk_slab_name, mask, prot->name);
2143 prot->twsk_prot->twsk_slab =
2144 kmem_cache_create(prot->twsk_prot->twsk_slab_name,
2145 prot->twsk_prot->twsk_obj_size,
2147 SLAB_HWCACHE_ALIGN |
2150 if (prot->twsk_prot->twsk_slab == NULL)
2151 goto out_free_timewait_sock_slab_name;
2155 write_lock(&proto_list_lock);
2156 list_add(&prot->node, &proto_list);
2157 assign_proto_idx(prot);
2158 write_unlock(&proto_list_lock);
2161 out_free_timewait_sock_slab_name:
2162 kfree(prot->twsk_prot->twsk_slab_name);
2163 out_free_request_sock_slab:
2164 if (prot->rsk_prot && prot->rsk_prot->slab) {
2165 kmem_cache_destroy(prot->rsk_prot->slab);
2166 prot->rsk_prot->slab = NULL;
2168 out_free_request_sock_slab_name:
2169 kfree(prot->rsk_prot->slab_name);
2171 kmem_cache_destroy(prot->slab);
2177 EXPORT_SYMBOL(proto_register);
2179 void proto_unregister(struct proto *prot)
2181 write_lock(&proto_list_lock);
2182 release_proto_idx(prot);
2183 list_del(&prot->node);
2184 write_unlock(&proto_list_lock);
2186 if (prot->slab != NULL) {
2187 kmem_cache_destroy(prot->slab);
2191 if (prot->rsk_prot != NULL && prot->rsk_prot->slab != NULL) {
2192 kmem_cache_destroy(prot->rsk_prot->slab);
2193 kfree(prot->rsk_prot->slab_name);
2194 prot->rsk_prot->slab = NULL;
2197 if (prot->twsk_prot != NULL && prot->twsk_prot->twsk_slab != NULL) {
2198 kmem_cache_destroy(prot->twsk_prot->twsk_slab);
2199 kfree(prot->twsk_prot->twsk_slab_name);
2200 prot->twsk_prot->twsk_slab = NULL;
2204 EXPORT_SYMBOL(proto_unregister);
2206 #ifdef CONFIG_PROC_FS
2207 static void *proto_seq_start(struct seq_file *seq, loff_t *pos)
2208 __acquires(proto_list_lock)
2210 read_lock(&proto_list_lock);
2211 return seq_list_start_head(&proto_list, *pos);
2214 static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2216 return seq_list_next(v, &proto_list, pos);
2219 static void proto_seq_stop(struct seq_file *seq, void *v)
2220 __releases(proto_list_lock)
2222 read_unlock(&proto_list_lock);
2225 static char proto_method_implemented(const void *method)
2227 return method == NULL ? 'n' : 'y';
2230 static void proto_seq_printf(struct seq_file *seq, struct proto *proto)
2232 seq_printf(seq, "%-9s %4u %6d %6d %-3s %6u %-3s %-10s "
2233 "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n",
2236 sock_prot_inuse_get(seq_file_net(seq), proto),
2237 proto->memory_allocated != NULL ? atomic_read(proto->memory_allocated) : -1,
2238 proto->memory_pressure != NULL ? *proto->memory_pressure ? "yes" : "no" : "NI",
2240 proto->slab == NULL ? "no" : "yes",
2241 module_name(proto->owner),
2242 proto_method_implemented(proto->close),
2243 proto_method_implemented(proto->connect),
2244 proto_method_implemented(proto->disconnect),
2245 proto_method_implemented(proto->accept),
2246 proto_method_implemented(proto->ioctl),
2247 proto_method_implemented(proto->init),
2248 proto_method_implemented(proto->destroy),
2249 proto_method_implemented(proto->shutdown),
2250 proto_method_implemented(proto->setsockopt),
2251 proto_method_implemented(proto->getsockopt),
2252 proto_method_implemented(proto->sendmsg),
2253 proto_method_implemented(proto->recvmsg),
2254 proto_method_implemented(proto->sendpage),
2255 proto_method_implemented(proto->bind),
2256 proto_method_implemented(proto->backlog_rcv),
2257 proto_method_implemented(proto->hash),
2258 proto_method_implemented(proto->unhash),
2259 proto_method_implemented(proto->get_port),
2260 proto_method_implemented(proto->enter_memory_pressure));
2263 static int proto_seq_show(struct seq_file *seq, void *v)
2265 if (v == &proto_list)
2266 seq_printf(seq, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s",
2275 "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n");
2277 proto_seq_printf(seq, list_entry(v, struct proto, node));
2281 static const struct seq_operations proto_seq_ops = {
2282 .start = proto_seq_start,
2283 .next = proto_seq_next,
2284 .stop = proto_seq_stop,
2285 .show = proto_seq_show,
2288 static int proto_seq_open(struct inode *inode, struct file *file)
2290 return seq_open_net(inode, file, &proto_seq_ops,
2291 sizeof(struct seq_net_private));
2294 static const struct file_operations proto_seq_fops = {
2295 .owner = THIS_MODULE,
2296 .open = proto_seq_open,
2298 .llseek = seq_lseek,
2299 .release = seq_release_net,
2302 static __net_init int proto_init_net(struct net *net)
2304 if (!proc_net_fops_create(net, "protocols", S_IRUGO, &proto_seq_fops))
2310 static __net_exit void proto_exit_net(struct net *net)
2312 proc_net_remove(net, "protocols");
2316 static __net_initdata struct pernet_operations proto_net_ops = {
2317 .init = proto_init_net,
2318 .exit = proto_exit_net,
2321 static int __init proto_init(void)
2323 return register_pernet_subsys(&proto_net_ops);
2326 subsys_initcall(proto_init);
2328 #endif /* PROC_FS */
2330 EXPORT_SYMBOL(sk_alloc);
2331 EXPORT_SYMBOL(sk_free);
2332 EXPORT_SYMBOL(sk_send_sigurg);
2333 EXPORT_SYMBOL(sock_alloc_send_skb);
2334 EXPORT_SYMBOL(sock_init_data);
2335 EXPORT_SYMBOL(sock_kfree_s);
2336 EXPORT_SYMBOL(sock_kmalloc);
2337 EXPORT_SYMBOL(sock_no_accept);
2338 EXPORT_SYMBOL(sock_no_bind);
2339 EXPORT_SYMBOL(sock_no_connect);
2340 EXPORT_SYMBOL(sock_no_getname);
2341 EXPORT_SYMBOL(sock_no_getsockopt);
2342 EXPORT_SYMBOL(sock_no_ioctl);
2343 EXPORT_SYMBOL(sock_no_listen);
2344 EXPORT_SYMBOL(sock_no_mmap);
2345 EXPORT_SYMBOL(sock_no_poll);
2346 EXPORT_SYMBOL(sock_no_recvmsg);
2347 EXPORT_SYMBOL(sock_no_sendmsg);
2348 EXPORT_SYMBOL(sock_no_sendpage);
2349 EXPORT_SYMBOL(sock_no_setsockopt);
2350 EXPORT_SYMBOL(sock_no_shutdown);
2351 EXPORT_SYMBOL(sock_no_socketpair);
2352 EXPORT_SYMBOL(sock_rfree);
2353 EXPORT_SYMBOL(sock_setsockopt);
2354 EXPORT_SYMBOL(sock_wfree);
2355 EXPORT_SYMBOL(sock_wmalloc);
2356 EXPORT_SYMBOL(sock_i_uid);
2357 EXPORT_SYMBOL(sock_i_ino);
2358 EXPORT_SYMBOL(sysctl_optmem_max);