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 *const 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" ,
158 "sk_lock-AF_IEEE802154",
161 static const char *const af_family_slock_key_strings[AF_MAX+1] = {
162 "slock-AF_UNSPEC", "slock-AF_UNIX" , "slock-AF_INET" ,
163 "slock-AF_AX25" , "slock-AF_IPX" , "slock-AF_APPLETALK",
164 "slock-AF_NETROM", "slock-AF_BRIDGE" , "slock-AF_ATMPVC" ,
165 "slock-AF_X25" , "slock-AF_INET6" , "slock-AF_ROSE" ,
166 "slock-AF_DECnet", "slock-AF_NETBEUI" , "slock-AF_SECURITY" ,
167 "slock-AF_KEY" , "slock-AF_NETLINK" , "slock-AF_PACKET" ,
168 "slock-AF_ASH" , "slock-AF_ECONET" , "slock-AF_ATMSVC" ,
169 "slock-AF_RDS" , "slock-AF_SNA" , "slock-AF_IRDA" ,
170 "slock-AF_PPPOX" , "slock-AF_WANPIPE" , "slock-AF_LLC" ,
171 "slock-27" , "slock-28" , "slock-AF_CAN" ,
172 "slock-AF_TIPC" , "slock-AF_BLUETOOTH", "slock-AF_IUCV" ,
173 "slock-AF_RXRPC" , "slock-AF_ISDN" , "slock-AF_PHONET" ,
174 "slock-AF_IEEE802154",
177 static const char *const af_family_clock_key_strings[AF_MAX+1] = {
178 "clock-AF_UNSPEC", "clock-AF_UNIX" , "clock-AF_INET" ,
179 "clock-AF_AX25" , "clock-AF_IPX" , "clock-AF_APPLETALK",
180 "clock-AF_NETROM", "clock-AF_BRIDGE" , "clock-AF_ATMPVC" ,
181 "clock-AF_X25" , "clock-AF_INET6" , "clock-AF_ROSE" ,
182 "clock-AF_DECnet", "clock-AF_NETBEUI" , "clock-AF_SECURITY" ,
183 "clock-AF_KEY" , "clock-AF_NETLINK" , "clock-AF_PACKET" ,
184 "clock-AF_ASH" , "clock-AF_ECONET" , "clock-AF_ATMSVC" ,
185 "clock-AF_RDS" , "clock-AF_SNA" , "clock-AF_IRDA" ,
186 "clock-AF_PPPOX" , "clock-AF_WANPIPE" , "clock-AF_LLC" ,
187 "clock-27" , "clock-28" , "clock-AF_CAN" ,
188 "clock-AF_TIPC" , "clock-AF_BLUETOOTH", "clock-AF_IUCV" ,
189 "clock-AF_RXRPC" , "clock-AF_ISDN" , "clock-AF_PHONET" ,
190 "clock-AF_IEEE802154",
195 * sk_callback_lock locking rules are per-address-family,
196 * so split the lock classes by using a per-AF key:
198 static struct lock_class_key af_callback_keys[AF_MAX];
200 /* Take into consideration the size of the struct sk_buff overhead in the
201 * determination of these values, since that is non-constant across
202 * platforms. This makes socket queueing behavior and performance
203 * not depend upon such differences.
205 #define _SK_MEM_PACKETS 256
206 #define _SK_MEM_OVERHEAD (sizeof(struct sk_buff) + 256)
207 #define SK_WMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS)
208 #define SK_RMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS)
210 /* Run time adjustable parameters. */
211 __u32 sysctl_wmem_max __read_mostly = SK_WMEM_MAX;
212 __u32 sysctl_rmem_max __read_mostly = SK_RMEM_MAX;
213 __u32 sysctl_wmem_default __read_mostly = SK_WMEM_MAX;
214 __u32 sysctl_rmem_default __read_mostly = SK_RMEM_MAX;
216 /* Maximal space eaten by iovec or ancilliary data plus some space */
217 int sysctl_optmem_max __read_mostly = sizeof(unsigned long)*(2*UIO_MAXIOV+512);
218 EXPORT_SYMBOL(sysctl_optmem_max);
220 static int sock_set_timeout(long *timeo_p, char __user *optval, int optlen)
224 if (optlen < sizeof(tv))
226 if (copy_from_user(&tv, optval, sizeof(tv)))
228 if (tv.tv_usec < 0 || tv.tv_usec >= USEC_PER_SEC)
232 static int warned __read_mostly;
235 if (warned < 10 && net_ratelimit()) {
237 printk(KERN_INFO "sock_set_timeout: `%s' (pid %d) "
238 "tries to set negative timeout\n",
239 current->comm, task_pid_nr(current));
243 *timeo_p = MAX_SCHEDULE_TIMEOUT;
244 if (tv.tv_sec == 0 && tv.tv_usec == 0)
246 if (tv.tv_sec < (MAX_SCHEDULE_TIMEOUT/HZ - 1))
247 *timeo_p = tv.tv_sec*HZ + (tv.tv_usec+(1000000/HZ-1))/(1000000/HZ);
251 static void sock_warn_obsolete_bsdism(const char *name)
254 static char warncomm[TASK_COMM_LEN];
255 if (strcmp(warncomm, current->comm) && warned < 5) {
256 strcpy(warncomm, current->comm);
257 printk(KERN_WARNING "process `%s' is using obsolete "
258 "%s SO_BSDCOMPAT\n", warncomm, name);
263 static void sock_disable_timestamp(struct sock *sk, int flag)
265 if (sock_flag(sk, flag)) {
266 sock_reset_flag(sk, flag);
267 if (!sock_flag(sk, SOCK_TIMESTAMP) &&
268 !sock_flag(sk, SOCK_TIMESTAMPING_RX_SOFTWARE)) {
269 net_disable_timestamp();
275 int sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
280 struct sk_buff_head *list = &sk->sk_receive_queue;
282 /* Cast sk->rcvbuf to unsigned... It's pointless, but reduces
283 number of warnings when compiling with -W --ANK
285 if (atomic_read(&sk->sk_rmem_alloc) + skb->truesize >=
286 (unsigned)sk->sk_rcvbuf) {
287 atomic_inc(&sk->sk_drops);
291 err = sk_filter(sk, skb);
295 if (!sk_rmem_schedule(sk, skb->truesize)) {
296 atomic_inc(&sk->sk_drops);
301 skb_set_owner_r(skb, sk);
303 /* Cache the SKB length before we tack it onto the receive
304 * queue. Once it is added it no longer belongs to us and
305 * may be freed by other threads of control pulling packets
310 spin_lock_irqsave(&list->lock, flags);
311 skb->dropcount = atomic_read(&sk->sk_drops);
312 __skb_queue_tail(list, skb);
313 spin_unlock_irqrestore(&list->lock, flags);
315 if (!sock_flag(sk, SOCK_DEAD))
316 sk->sk_data_ready(sk, skb_len);
319 EXPORT_SYMBOL(sock_queue_rcv_skb);
321 int sk_receive_skb(struct sock *sk, struct sk_buff *skb, const int nested)
323 int rc = NET_RX_SUCCESS;
325 if (sk_filter(sk, skb))
326 goto discard_and_relse;
331 bh_lock_sock_nested(sk);
334 if (!sock_owned_by_user(sk)) {
336 * trylock + unlock semantics:
338 mutex_acquire(&sk->sk_lock.dep_map, 0, 1, _RET_IP_);
340 rc = sk_backlog_rcv(sk, skb);
342 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_);
344 sk_add_backlog(sk, skb);
353 EXPORT_SYMBOL(sk_receive_skb);
355 void sk_reset_txq(struct sock *sk)
357 sk_tx_queue_clear(sk);
359 EXPORT_SYMBOL(sk_reset_txq);
361 struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie)
363 struct dst_entry *dst = sk->sk_dst_cache;
365 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
366 sk_tx_queue_clear(sk);
367 sk->sk_dst_cache = NULL;
374 EXPORT_SYMBOL(__sk_dst_check);
376 struct dst_entry *sk_dst_check(struct sock *sk, u32 cookie)
378 struct dst_entry *dst = sk_dst_get(sk);
380 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
388 EXPORT_SYMBOL(sk_dst_check);
390 static int sock_bindtodevice(struct sock *sk, char __user *optval, int optlen)
392 int ret = -ENOPROTOOPT;
393 #ifdef CONFIG_NETDEVICES
394 struct net *net = sock_net(sk);
395 char devname[IFNAMSIZ];
400 if (!capable(CAP_NET_RAW))
407 /* Bind this socket to a particular device like "eth0",
408 * as specified in the passed interface name. If the
409 * name is "" or the option length is zero the socket
412 if (optlen > IFNAMSIZ - 1)
413 optlen = IFNAMSIZ - 1;
414 memset(devname, 0, sizeof(devname));
417 if (copy_from_user(devname, optval, optlen))
420 if (devname[0] == '\0') {
423 struct net_device *dev;
426 dev = dev_get_by_name_rcu(net, devname);
428 index = dev->ifindex;
436 sk->sk_bound_dev_if = index;
448 static inline void sock_valbool_flag(struct sock *sk, int bit, int valbool)
451 sock_set_flag(sk, bit);
453 sock_reset_flag(sk, bit);
457 * This is meant for all protocols to use and covers goings on
458 * at the socket level. Everything here is generic.
461 int sock_setsockopt(struct socket *sock, int level, int optname,
462 char __user *optval, unsigned int optlen)
464 struct sock *sk = sock->sk;
471 * Options without arguments
474 if (optname == SO_BINDTODEVICE)
475 return sock_bindtodevice(sk, optval, optlen);
477 if (optlen < sizeof(int))
480 if (get_user(val, (int __user *)optval))
483 valbool = val ? 1 : 0;
489 if (val && !capable(CAP_NET_ADMIN))
492 sock_valbool_flag(sk, SOCK_DBG, valbool);
495 sk->sk_reuse = valbool;
504 sock_valbool_flag(sk, SOCK_LOCALROUTE, valbool);
507 sock_valbool_flag(sk, SOCK_BROADCAST, valbool);
510 /* Don't error on this BSD doesn't and if you think
511 about it this is right. Otherwise apps have to
512 play 'guess the biggest size' games. RCVBUF/SNDBUF
513 are treated in BSD as hints */
515 if (val > sysctl_wmem_max)
516 val = sysctl_wmem_max;
518 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
519 if ((val * 2) < SOCK_MIN_SNDBUF)
520 sk->sk_sndbuf = SOCK_MIN_SNDBUF;
522 sk->sk_sndbuf = val * 2;
525 * Wake up sending tasks if we
528 sk->sk_write_space(sk);
532 if (!capable(CAP_NET_ADMIN)) {
539 /* Don't error on this BSD doesn't and if you think
540 about it this is right. Otherwise apps have to
541 play 'guess the biggest size' games. RCVBUF/SNDBUF
542 are treated in BSD as hints */
544 if (val > sysctl_rmem_max)
545 val = sysctl_rmem_max;
547 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
549 * We double it on the way in to account for
550 * "struct sk_buff" etc. overhead. Applications
551 * assume that the SO_RCVBUF setting they make will
552 * allow that much actual data to be received on that
555 * Applications are unaware that "struct sk_buff" and
556 * other overheads allocate from the receive buffer
557 * during socket buffer allocation.
559 * And after considering the possible alternatives,
560 * returning the value we actually used in getsockopt
561 * is the most desirable behavior.
563 if ((val * 2) < SOCK_MIN_RCVBUF)
564 sk->sk_rcvbuf = SOCK_MIN_RCVBUF;
566 sk->sk_rcvbuf = val * 2;
570 if (!capable(CAP_NET_ADMIN)) {
578 if (sk->sk_protocol == IPPROTO_TCP)
579 tcp_set_keepalive(sk, valbool);
581 sock_valbool_flag(sk, SOCK_KEEPOPEN, valbool);
585 sock_valbool_flag(sk, SOCK_URGINLINE, valbool);
589 sk->sk_no_check = valbool;
593 if ((val >= 0 && val <= 6) || capable(CAP_NET_ADMIN))
594 sk->sk_priority = val;
600 if (optlen < sizeof(ling)) {
601 ret = -EINVAL; /* 1003.1g */
604 if (copy_from_user(&ling, optval, sizeof(ling))) {
609 sock_reset_flag(sk, SOCK_LINGER);
611 #if (BITS_PER_LONG == 32)
612 if ((unsigned int)ling.l_linger >= MAX_SCHEDULE_TIMEOUT/HZ)
613 sk->sk_lingertime = MAX_SCHEDULE_TIMEOUT;
616 sk->sk_lingertime = (unsigned int)ling.l_linger * HZ;
617 sock_set_flag(sk, SOCK_LINGER);
622 sock_warn_obsolete_bsdism("setsockopt");
627 set_bit(SOCK_PASSCRED, &sock->flags);
629 clear_bit(SOCK_PASSCRED, &sock->flags);
635 if (optname == SO_TIMESTAMP)
636 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
638 sock_set_flag(sk, SOCK_RCVTSTAMPNS);
639 sock_set_flag(sk, SOCK_RCVTSTAMP);
640 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
642 sock_reset_flag(sk, SOCK_RCVTSTAMP);
643 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
647 case SO_TIMESTAMPING:
648 if (val & ~SOF_TIMESTAMPING_MASK) {
652 sock_valbool_flag(sk, SOCK_TIMESTAMPING_TX_HARDWARE,
653 val & SOF_TIMESTAMPING_TX_HARDWARE);
654 sock_valbool_flag(sk, SOCK_TIMESTAMPING_TX_SOFTWARE,
655 val & SOF_TIMESTAMPING_TX_SOFTWARE);
656 sock_valbool_flag(sk, SOCK_TIMESTAMPING_RX_HARDWARE,
657 val & SOF_TIMESTAMPING_RX_HARDWARE);
658 if (val & SOF_TIMESTAMPING_RX_SOFTWARE)
659 sock_enable_timestamp(sk,
660 SOCK_TIMESTAMPING_RX_SOFTWARE);
662 sock_disable_timestamp(sk,
663 SOCK_TIMESTAMPING_RX_SOFTWARE);
664 sock_valbool_flag(sk, SOCK_TIMESTAMPING_SOFTWARE,
665 val & SOF_TIMESTAMPING_SOFTWARE);
666 sock_valbool_flag(sk, SOCK_TIMESTAMPING_SYS_HARDWARE,
667 val & SOF_TIMESTAMPING_SYS_HARDWARE);
668 sock_valbool_flag(sk, SOCK_TIMESTAMPING_RAW_HARDWARE,
669 val & SOF_TIMESTAMPING_RAW_HARDWARE);
675 sk->sk_rcvlowat = val ? : 1;
679 ret = sock_set_timeout(&sk->sk_rcvtimeo, optval, optlen);
683 ret = sock_set_timeout(&sk->sk_sndtimeo, optval, optlen);
686 case SO_ATTACH_FILTER:
688 if (optlen == sizeof(struct sock_fprog)) {
689 struct sock_fprog fprog;
692 if (copy_from_user(&fprog, optval, sizeof(fprog)))
695 ret = sk_attach_filter(&fprog, sk);
699 case SO_DETACH_FILTER:
700 ret = sk_detach_filter(sk);
705 set_bit(SOCK_PASSSEC, &sock->flags);
707 clear_bit(SOCK_PASSSEC, &sock->flags);
710 if (!capable(CAP_NET_ADMIN))
716 /* We implement the SO_SNDLOWAT etc to
717 not be settable (1003.1g 5.3) */
720 sock_set_flag(sk, SOCK_RXQ_OVFL);
722 sock_reset_flag(sk, SOCK_RXQ_OVFL);
731 EXPORT_SYMBOL(sock_setsockopt);
734 int sock_getsockopt(struct socket *sock, int level, int optname,
735 char __user *optval, int __user *optlen)
737 struct sock *sk = sock->sk;
745 unsigned int lv = sizeof(int);
748 if (get_user(len, optlen))
753 memset(&v, 0, sizeof(v));
757 v.val = sock_flag(sk, SOCK_DBG);
761 v.val = sock_flag(sk, SOCK_LOCALROUTE);
765 v.val = !!sock_flag(sk, SOCK_BROADCAST);
769 v.val = sk->sk_sndbuf;
773 v.val = sk->sk_rcvbuf;
777 v.val = sk->sk_reuse;
781 v.val = !!sock_flag(sk, SOCK_KEEPOPEN);
789 v.val = sk->sk_protocol;
793 v.val = sk->sk_family;
797 v.val = -sock_error(sk);
799 v.val = xchg(&sk->sk_err_soft, 0);
803 v.val = !!sock_flag(sk, SOCK_URGINLINE);
807 v.val = sk->sk_no_check;
811 v.val = sk->sk_priority;
816 v.ling.l_onoff = !!sock_flag(sk, SOCK_LINGER);
817 v.ling.l_linger = sk->sk_lingertime / HZ;
821 sock_warn_obsolete_bsdism("getsockopt");
825 v.val = sock_flag(sk, SOCK_RCVTSTAMP) &&
826 !sock_flag(sk, SOCK_RCVTSTAMPNS);
830 v.val = sock_flag(sk, SOCK_RCVTSTAMPNS);
833 case SO_TIMESTAMPING:
835 if (sock_flag(sk, SOCK_TIMESTAMPING_TX_HARDWARE))
836 v.val |= SOF_TIMESTAMPING_TX_HARDWARE;
837 if (sock_flag(sk, SOCK_TIMESTAMPING_TX_SOFTWARE))
838 v.val |= SOF_TIMESTAMPING_TX_SOFTWARE;
839 if (sock_flag(sk, SOCK_TIMESTAMPING_RX_HARDWARE))
840 v.val |= SOF_TIMESTAMPING_RX_HARDWARE;
841 if (sock_flag(sk, SOCK_TIMESTAMPING_RX_SOFTWARE))
842 v.val |= SOF_TIMESTAMPING_RX_SOFTWARE;
843 if (sock_flag(sk, SOCK_TIMESTAMPING_SOFTWARE))
844 v.val |= SOF_TIMESTAMPING_SOFTWARE;
845 if (sock_flag(sk, SOCK_TIMESTAMPING_SYS_HARDWARE))
846 v.val |= SOF_TIMESTAMPING_SYS_HARDWARE;
847 if (sock_flag(sk, SOCK_TIMESTAMPING_RAW_HARDWARE))
848 v.val |= SOF_TIMESTAMPING_RAW_HARDWARE;
852 lv = sizeof(struct timeval);
853 if (sk->sk_rcvtimeo == MAX_SCHEDULE_TIMEOUT) {
857 v.tm.tv_sec = sk->sk_rcvtimeo / HZ;
858 v.tm.tv_usec = ((sk->sk_rcvtimeo % HZ) * 1000000) / HZ;
863 lv = sizeof(struct timeval);
864 if (sk->sk_sndtimeo == MAX_SCHEDULE_TIMEOUT) {
868 v.tm.tv_sec = sk->sk_sndtimeo / HZ;
869 v.tm.tv_usec = ((sk->sk_sndtimeo % HZ) * 1000000) / HZ;
874 v.val = sk->sk_rcvlowat;
882 v.val = test_bit(SOCK_PASSCRED, &sock->flags) ? 1 : 0;
886 if (len > sizeof(sk->sk_peercred))
887 len = sizeof(sk->sk_peercred);
888 if (copy_to_user(optval, &sk->sk_peercred, len))
896 if (sock->ops->getname(sock, (struct sockaddr *)address, &lv, 2))
900 if (copy_to_user(optval, address, len))
905 /* Dubious BSD thing... Probably nobody even uses it, but
906 * the UNIX standard wants it for whatever reason... -DaveM
909 v.val = sk->sk_state == TCP_LISTEN;
913 v.val = test_bit(SOCK_PASSSEC, &sock->flags) ? 1 : 0;
917 return security_socket_getpeersec_stream(sock, optval, optlen, len);
924 v.val = !!sock_flag(sk, SOCK_RXQ_OVFL);
933 if (copy_to_user(optval, &v, len))
936 if (put_user(len, optlen))
942 * Initialize an sk_lock.
944 * (We also register the sk_lock with the lock validator.)
946 static inline void sock_lock_init(struct sock *sk)
948 sock_lock_init_class_and_name(sk,
949 af_family_slock_key_strings[sk->sk_family],
950 af_family_slock_keys + sk->sk_family,
951 af_family_key_strings[sk->sk_family],
952 af_family_keys + sk->sk_family);
956 * Copy all fields from osk to nsk but nsk->sk_refcnt must not change yet,
957 * even temporarly, because of RCU lookups. sk_node should also be left as is.
959 static void sock_copy(struct sock *nsk, const struct sock *osk)
961 #ifdef CONFIG_SECURITY_NETWORK
962 void *sptr = nsk->sk_security;
964 BUILD_BUG_ON(offsetof(struct sock, sk_copy_start) !=
965 sizeof(osk->sk_node) + sizeof(osk->sk_refcnt) +
966 sizeof(osk->sk_tx_queue_mapping));
967 memcpy(&nsk->sk_copy_start, &osk->sk_copy_start,
968 osk->sk_prot->obj_size - offsetof(struct sock, sk_copy_start));
969 #ifdef CONFIG_SECURITY_NETWORK
970 nsk->sk_security = sptr;
971 security_sk_clone(osk, nsk);
975 static struct sock *sk_prot_alloc(struct proto *prot, gfp_t priority,
979 struct kmem_cache *slab;
983 sk = kmem_cache_alloc(slab, priority & ~__GFP_ZERO);
986 if (priority & __GFP_ZERO) {
988 * caches using SLAB_DESTROY_BY_RCU should let
989 * sk_node.next un-modified. Special care is taken
990 * when initializing object to zero.
992 if (offsetof(struct sock, sk_node.next) != 0)
993 memset(sk, 0, offsetof(struct sock, sk_node.next));
994 memset(&sk->sk_node.pprev, 0,
995 prot->obj_size - offsetof(struct sock,
1000 sk = kmalloc(prot->obj_size, priority);
1003 kmemcheck_annotate_bitfield(sk, flags);
1005 if (security_sk_alloc(sk, family, priority))
1008 if (!try_module_get(prot->owner))
1010 sk_tx_queue_clear(sk);
1016 security_sk_free(sk);
1019 kmem_cache_free(slab, sk);
1025 static void sk_prot_free(struct proto *prot, struct sock *sk)
1027 struct kmem_cache *slab;
1028 struct module *owner;
1030 owner = prot->owner;
1033 security_sk_free(sk);
1035 kmem_cache_free(slab, sk);
1042 * sk_alloc - All socket objects are allocated here
1043 * @net: the applicable net namespace
1044 * @family: protocol family
1045 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
1046 * @prot: struct proto associated with this new sock instance
1048 struct sock *sk_alloc(struct net *net, int family, gfp_t priority,
1053 sk = sk_prot_alloc(prot, priority | __GFP_ZERO, family);
1055 sk->sk_family = family;
1057 * See comment in struct sock definition to understand
1058 * why we need sk_prot_creator -acme
1060 sk->sk_prot = sk->sk_prot_creator = prot;
1062 sock_net_set(sk, get_net(net));
1063 atomic_set(&sk->sk_wmem_alloc, 1);
1068 EXPORT_SYMBOL(sk_alloc);
1070 static void __sk_free(struct sock *sk)
1072 struct sk_filter *filter;
1074 if (sk->sk_destruct)
1075 sk->sk_destruct(sk);
1077 filter = rcu_dereference(sk->sk_filter);
1079 sk_filter_uncharge(sk, filter);
1080 rcu_assign_pointer(sk->sk_filter, NULL);
1083 sock_disable_timestamp(sk, SOCK_TIMESTAMP);
1084 sock_disable_timestamp(sk, SOCK_TIMESTAMPING_RX_SOFTWARE);
1086 if (atomic_read(&sk->sk_omem_alloc))
1087 printk(KERN_DEBUG "%s: optmem leakage (%d bytes) detected.\n",
1088 __func__, atomic_read(&sk->sk_omem_alloc));
1090 put_net(sock_net(sk));
1091 sk_prot_free(sk->sk_prot_creator, sk);
1094 void sk_free(struct sock *sk)
1097 * We substract one from sk_wmem_alloc and can know if
1098 * some packets are still in some tx queue.
1099 * If not null, sock_wfree() will call __sk_free(sk) later
1101 if (atomic_dec_and_test(&sk->sk_wmem_alloc))
1104 EXPORT_SYMBOL(sk_free);
1107 * Last sock_put should drop referrence to sk->sk_net. It has already
1108 * been dropped in sk_change_net. Taking referrence to stopping namespace
1110 * Take referrence to a socket to remove it from hash _alive_ and after that
1111 * destroy it in the context of init_net.
1113 void sk_release_kernel(struct sock *sk)
1115 if (sk == NULL || sk->sk_socket == NULL)
1119 sock_release(sk->sk_socket);
1120 release_net(sock_net(sk));
1121 sock_net_set(sk, get_net(&init_net));
1124 EXPORT_SYMBOL(sk_release_kernel);
1126 struct sock *sk_clone(const struct sock *sk, const gfp_t priority)
1130 newsk = sk_prot_alloc(sk->sk_prot, priority, sk->sk_family);
1131 if (newsk != NULL) {
1132 struct sk_filter *filter;
1134 sock_copy(newsk, sk);
1137 get_net(sock_net(newsk));
1138 sk_node_init(&newsk->sk_node);
1139 sock_lock_init(newsk);
1140 bh_lock_sock(newsk);
1141 newsk->sk_backlog.head = newsk->sk_backlog.tail = NULL;
1143 atomic_set(&newsk->sk_rmem_alloc, 0);
1145 * sk_wmem_alloc set to one (see sk_free() and sock_wfree())
1147 atomic_set(&newsk->sk_wmem_alloc, 1);
1148 atomic_set(&newsk->sk_omem_alloc, 0);
1149 skb_queue_head_init(&newsk->sk_receive_queue);
1150 skb_queue_head_init(&newsk->sk_write_queue);
1151 #ifdef CONFIG_NET_DMA
1152 skb_queue_head_init(&newsk->sk_async_wait_queue);
1155 rwlock_init(&newsk->sk_dst_lock);
1156 rwlock_init(&newsk->sk_callback_lock);
1157 lockdep_set_class_and_name(&newsk->sk_callback_lock,
1158 af_callback_keys + newsk->sk_family,
1159 af_family_clock_key_strings[newsk->sk_family]);
1161 newsk->sk_dst_cache = NULL;
1162 newsk->sk_wmem_queued = 0;
1163 newsk->sk_forward_alloc = 0;
1164 newsk->sk_send_head = NULL;
1165 newsk->sk_userlocks = sk->sk_userlocks & ~SOCK_BINDPORT_LOCK;
1167 sock_reset_flag(newsk, SOCK_DONE);
1168 skb_queue_head_init(&newsk->sk_error_queue);
1170 filter = newsk->sk_filter;
1172 sk_filter_charge(newsk, filter);
1174 if (unlikely(xfrm_sk_clone_policy(newsk))) {
1175 /* It is still raw copy of parent, so invalidate
1176 * destructor and make plain sk_free() */
1177 newsk->sk_destruct = NULL;
1184 newsk->sk_priority = 0;
1186 * Before updating sk_refcnt, we must commit prior changes to memory
1187 * (Documentation/RCU/rculist_nulls.txt for details)
1190 atomic_set(&newsk->sk_refcnt, 2);
1193 * Increment the counter in the same struct proto as the master
1194 * sock (sk_refcnt_debug_inc uses newsk->sk_prot->socks, that
1195 * is the same as sk->sk_prot->socks, as this field was copied
1198 * This _changes_ the previous behaviour, where
1199 * tcp_create_openreq_child always was incrementing the
1200 * equivalent to tcp_prot->socks (inet_sock_nr), so this have
1201 * to be taken into account in all callers. -acme
1203 sk_refcnt_debug_inc(newsk);
1204 sk_set_socket(newsk, NULL);
1205 newsk->sk_sleep = NULL;
1207 if (newsk->sk_prot->sockets_allocated)
1208 percpu_counter_inc(newsk->sk_prot->sockets_allocated);
1213 EXPORT_SYMBOL_GPL(sk_clone);
1215 void sk_setup_caps(struct sock *sk, struct dst_entry *dst)
1217 __sk_dst_set(sk, dst);
1218 sk->sk_route_caps = dst->dev->features;
1219 if (sk->sk_route_caps & NETIF_F_GSO)
1220 sk->sk_route_caps |= NETIF_F_GSO_SOFTWARE;
1221 if (sk_can_gso(sk)) {
1222 if (dst->header_len) {
1223 sk->sk_route_caps &= ~NETIF_F_GSO_MASK;
1225 sk->sk_route_caps |= NETIF_F_SG | NETIF_F_HW_CSUM;
1226 sk->sk_gso_max_size = dst->dev->gso_max_size;
1230 EXPORT_SYMBOL_GPL(sk_setup_caps);
1232 void __init sk_init(void)
1234 if (totalram_pages <= 4096) {
1235 sysctl_wmem_max = 32767;
1236 sysctl_rmem_max = 32767;
1237 sysctl_wmem_default = 32767;
1238 sysctl_rmem_default = 32767;
1239 } else if (totalram_pages >= 131072) {
1240 sysctl_wmem_max = 131071;
1241 sysctl_rmem_max = 131071;
1246 * Simple resource managers for sockets.
1251 * Write buffer destructor automatically called from kfree_skb.
1253 void sock_wfree(struct sk_buff *skb)
1255 struct sock *sk = skb->sk;
1256 unsigned int len = skb->truesize;
1258 if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE)) {
1260 * Keep a reference on sk_wmem_alloc, this will be released
1261 * after sk_write_space() call
1263 atomic_sub(len - 1, &sk->sk_wmem_alloc);
1264 sk->sk_write_space(sk);
1268 * if sk_wmem_alloc reaches 0, we must finish what sk_free()
1269 * could not do because of in-flight packets
1271 if (atomic_sub_and_test(len, &sk->sk_wmem_alloc))
1274 EXPORT_SYMBOL(sock_wfree);
1277 * Read buffer destructor automatically called from kfree_skb.
1279 void sock_rfree(struct sk_buff *skb)
1281 struct sock *sk = skb->sk;
1283 atomic_sub(skb->truesize, &sk->sk_rmem_alloc);
1284 sk_mem_uncharge(skb->sk, skb->truesize);
1286 EXPORT_SYMBOL(sock_rfree);
1289 int sock_i_uid(struct sock *sk)
1293 read_lock(&sk->sk_callback_lock);
1294 uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : 0;
1295 read_unlock(&sk->sk_callback_lock);
1298 EXPORT_SYMBOL(sock_i_uid);
1300 unsigned long sock_i_ino(struct sock *sk)
1304 read_lock(&sk->sk_callback_lock);
1305 ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0;
1306 read_unlock(&sk->sk_callback_lock);
1309 EXPORT_SYMBOL(sock_i_ino);
1312 * Allocate a skb from the socket's send buffer.
1314 struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force,
1317 if (force || atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
1318 struct sk_buff *skb = alloc_skb(size, priority);
1320 skb_set_owner_w(skb, sk);
1326 EXPORT_SYMBOL(sock_wmalloc);
1329 * Allocate a skb from the socket's receive buffer.
1331 struct sk_buff *sock_rmalloc(struct sock *sk, unsigned long size, int force,
1334 if (force || atomic_read(&sk->sk_rmem_alloc) < sk->sk_rcvbuf) {
1335 struct sk_buff *skb = alloc_skb(size, priority);
1337 skb_set_owner_r(skb, sk);
1345 * Allocate a memory block from the socket's option memory buffer.
1347 void *sock_kmalloc(struct sock *sk, int size, gfp_t priority)
1349 if ((unsigned)size <= sysctl_optmem_max &&
1350 atomic_read(&sk->sk_omem_alloc) + size < sysctl_optmem_max) {
1352 /* First do the add, to avoid the race if kmalloc
1355 atomic_add(size, &sk->sk_omem_alloc);
1356 mem = kmalloc(size, priority);
1359 atomic_sub(size, &sk->sk_omem_alloc);
1363 EXPORT_SYMBOL(sock_kmalloc);
1366 * Free an option memory block.
1368 void sock_kfree_s(struct sock *sk, void *mem, int size)
1371 atomic_sub(size, &sk->sk_omem_alloc);
1373 EXPORT_SYMBOL(sock_kfree_s);
1375 /* It is almost wait_for_tcp_memory minus release_sock/lock_sock.
1376 I think, these locks should be removed for datagram sockets.
1378 static long sock_wait_for_wmem(struct sock *sk, long timeo)
1382 clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1386 if (signal_pending(current))
1388 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1389 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
1390 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf)
1392 if (sk->sk_shutdown & SEND_SHUTDOWN)
1396 timeo = schedule_timeout(timeo);
1398 finish_wait(sk->sk_sleep, &wait);
1404 * Generic send/receive buffer handlers
1407 struct sk_buff *sock_alloc_send_pskb(struct sock *sk, unsigned long header_len,
1408 unsigned long data_len, int noblock,
1411 struct sk_buff *skb;
1416 gfp_mask = sk->sk_allocation;
1417 if (gfp_mask & __GFP_WAIT)
1418 gfp_mask |= __GFP_REPEAT;
1420 timeo = sock_sndtimeo(sk, noblock);
1422 err = sock_error(sk);
1427 if (sk->sk_shutdown & SEND_SHUTDOWN)
1430 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
1431 skb = alloc_skb(header_len, gfp_mask);
1436 /* No pages, we're done... */
1440 npages = (data_len + (PAGE_SIZE - 1)) >> PAGE_SHIFT;
1441 skb->truesize += data_len;
1442 skb_shinfo(skb)->nr_frags = npages;
1443 for (i = 0; i < npages; i++) {
1447 page = alloc_pages(sk->sk_allocation, 0);
1450 skb_shinfo(skb)->nr_frags = i;
1455 frag = &skb_shinfo(skb)->frags[i];
1457 frag->page_offset = 0;
1458 frag->size = (data_len >= PAGE_SIZE ?
1461 data_len -= PAGE_SIZE;
1464 /* Full success... */
1470 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1471 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1475 if (signal_pending(current))
1477 timeo = sock_wait_for_wmem(sk, timeo);
1480 skb_set_owner_w(skb, sk);
1484 err = sock_intr_errno(timeo);
1489 EXPORT_SYMBOL(sock_alloc_send_pskb);
1491 struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size,
1492 int noblock, int *errcode)
1494 return sock_alloc_send_pskb(sk, size, 0, noblock, errcode);
1496 EXPORT_SYMBOL(sock_alloc_send_skb);
1498 static void __lock_sock(struct sock *sk)
1503 prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait,
1504 TASK_UNINTERRUPTIBLE);
1505 spin_unlock_bh(&sk->sk_lock.slock);
1507 spin_lock_bh(&sk->sk_lock.slock);
1508 if (!sock_owned_by_user(sk))
1511 finish_wait(&sk->sk_lock.wq, &wait);
1514 static void __release_sock(struct sock *sk)
1516 struct sk_buff *skb = sk->sk_backlog.head;
1519 sk->sk_backlog.head = sk->sk_backlog.tail = NULL;
1523 struct sk_buff *next = skb->next;
1526 sk_backlog_rcv(sk, skb);
1529 * We are in process context here with softirqs
1530 * disabled, use cond_resched_softirq() to preempt.
1531 * This is safe to do because we've taken the backlog
1534 cond_resched_softirq();
1537 } while (skb != NULL);
1540 } while ((skb = sk->sk_backlog.head) != NULL);
1544 * sk_wait_data - wait for data to arrive at sk_receive_queue
1545 * @sk: sock to wait on
1546 * @timeo: for how long
1548 * Now socket state including sk->sk_err is changed only under lock,
1549 * hence we may omit checks after joining wait queue.
1550 * We check receive queue before schedule() only as optimization;
1551 * it is very likely that release_sock() added new data.
1553 int sk_wait_data(struct sock *sk, long *timeo)
1558 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
1559 set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
1560 rc = sk_wait_event(sk, timeo, !skb_queue_empty(&sk->sk_receive_queue));
1561 clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
1562 finish_wait(sk->sk_sleep, &wait);
1565 EXPORT_SYMBOL(sk_wait_data);
1568 * __sk_mem_schedule - increase sk_forward_alloc and memory_allocated
1570 * @size: memory size to allocate
1571 * @kind: allocation type
1573 * If kind is SK_MEM_SEND, it means wmem allocation. Otherwise it means
1574 * rmem allocation. This function assumes that protocols which have
1575 * memory_pressure use sk_wmem_queued as write buffer accounting.
1577 int __sk_mem_schedule(struct sock *sk, int size, int kind)
1579 struct proto *prot = sk->sk_prot;
1580 int amt = sk_mem_pages(size);
1583 sk->sk_forward_alloc += amt * SK_MEM_QUANTUM;
1584 allocated = atomic_add_return(amt, prot->memory_allocated);
1587 if (allocated <= prot->sysctl_mem[0]) {
1588 if (prot->memory_pressure && *prot->memory_pressure)
1589 *prot->memory_pressure = 0;
1593 /* Under pressure. */
1594 if (allocated > prot->sysctl_mem[1])
1595 if (prot->enter_memory_pressure)
1596 prot->enter_memory_pressure(sk);
1598 /* Over hard limit. */
1599 if (allocated > prot->sysctl_mem[2])
1600 goto suppress_allocation;
1602 /* guarantee minimum buffer size under pressure */
1603 if (kind == SK_MEM_RECV) {
1604 if (atomic_read(&sk->sk_rmem_alloc) < prot->sysctl_rmem[0])
1606 } else { /* SK_MEM_SEND */
1607 if (sk->sk_type == SOCK_STREAM) {
1608 if (sk->sk_wmem_queued < prot->sysctl_wmem[0])
1610 } else if (atomic_read(&sk->sk_wmem_alloc) <
1611 prot->sysctl_wmem[0])
1615 if (prot->memory_pressure) {
1618 if (!*prot->memory_pressure)
1620 alloc = percpu_counter_read_positive(prot->sockets_allocated);
1621 if (prot->sysctl_mem[2] > alloc *
1622 sk_mem_pages(sk->sk_wmem_queued +
1623 atomic_read(&sk->sk_rmem_alloc) +
1624 sk->sk_forward_alloc))
1628 suppress_allocation:
1630 if (kind == SK_MEM_SEND && sk->sk_type == SOCK_STREAM) {
1631 sk_stream_moderate_sndbuf(sk);
1633 /* Fail only if socket is _under_ its sndbuf.
1634 * In this case we cannot block, so that we have to fail.
1636 if (sk->sk_wmem_queued + size >= sk->sk_sndbuf)
1640 /* Alas. Undo changes. */
1641 sk->sk_forward_alloc -= amt * SK_MEM_QUANTUM;
1642 atomic_sub(amt, prot->memory_allocated);
1645 EXPORT_SYMBOL(__sk_mem_schedule);
1648 * __sk_reclaim - reclaim memory_allocated
1651 void __sk_mem_reclaim(struct sock *sk)
1653 struct proto *prot = sk->sk_prot;
1655 atomic_sub(sk->sk_forward_alloc >> SK_MEM_QUANTUM_SHIFT,
1656 prot->memory_allocated);
1657 sk->sk_forward_alloc &= SK_MEM_QUANTUM - 1;
1659 if (prot->memory_pressure && *prot->memory_pressure &&
1660 (atomic_read(prot->memory_allocated) < prot->sysctl_mem[0]))
1661 *prot->memory_pressure = 0;
1663 EXPORT_SYMBOL(__sk_mem_reclaim);
1667 * Set of default routines for initialising struct proto_ops when
1668 * the protocol does not support a particular function. In certain
1669 * cases where it makes no sense for a protocol to have a "do nothing"
1670 * function, some default processing is provided.
1673 int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len)
1677 EXPORT_SYMBOL(sock_no_bind);
1679 int sock_no_connect(struct socket *sock, struct sockaddr *saddr,
1684 EXPORT_SYMBOL(sock_no_connect);
1686 int sock_no_socketpair(struct socket *sock1, struct socket *sock2)
1690 EXPORT_SYMBOL(sock_no_socketpair);
1692 int sock_no_accept(struct socket *sock, struct socket *newsock, int flags)
1696 EXPORT_SYMBOL(sock_no_accept);
1698 int sock_no_getname(struct socket *sock, struct sockaddr *saddr,
1703 EXPORT_SYMBOL(sock_no_getname);
1705 unsigned int sock_no_poll(struct file *file, struct socket *sock, poll_table *pt)
1709 EXPORT_SYMBOL(sock_no_poll);
1711 int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1715 EXPORT_SYMBOL(sock_no_ioctl);
1717 int sock_no_listen(struct socket *sock, int backlog)
1721 EXPORT_SYMBOL(sock_no_listen);
1723 int sock_no_shutdown(struct socket *sock, int how)
1727 EXPORT_SYMBOL(sock_no_shutdown);
1729 int sock_no_setsockopt(struct socket *sock, int level, int optname,
1730 char __user *optval, unsigned int optlen)
1734 EXPORT_SYMBOL(sock_no_setsockopt);
1736 int sock_no_getsockopt(struct socket *sock, int level, int optname,
1737 char __user *optval, int __user *optlen)
1741 EXPORT_SYMBOL(sock_no_getsockopt);
1743 int sock_no_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
1748 EXPORT_SYMBOL(sock_no_sendmsg);
1750 int sock_no_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
1751 size_t len, int flags)
1755 EXPORT_SYMBOL(sock_no_recvmsg);
1757 int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma)
1759 /* Mirror missing mmap method error code */
1762 EXPORT_SYMBOL(sock_no_mmap);
1764 ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags)
1767 struct msghdr msg = {.msg_flags = flags};
1769 char *kaddr = kmap(page);
1770 iov.iov_base = kaddr + offset;
1772 res = kernel_sendmsg(sock, &msg, &iov, 1, size);
1776 EXPORT_SYMBOL(sock_no_sendpage);
1779 * Default Socket Callbacks
1782 static void sock_def_wakeup(struct sock *sk)
1784 read_lock(&sk->sk_callback_lock);
1785 if (sk_has_sleeper(sk))
1786 wake_up_interruptible_all(sk->sk_sleep);
1787 read_unlock(&sk->sk_callback_lock);
1790 static void sock_def_error_report(struct sock *sk)
1792 read_lock(&sk->sk_callback_lock);
1793 if (sk_has_sleeper(sk))
1794 wake_up_interruptible_poll(sk->sk_sleep, POLLERR);
1795 sk_wake_async(sk, SOCK_WAKE_IO, POLL_ERR);
1796 read_unlock(&sk->sk_callback_lock);
1799 static void sock_def_readable(struct sock *sk, int len)
1801 read_lock(&sk->sk_callback_lock);
1802 if (sk_has_sleeper(sk))
1803 wake_up_interruptible_sync_poll(sk->sk_sleep, POLLIN |
1804 POLLRDNORM | POLLRDBAND);
1805 sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN);
1806 read_unlock(&sk->sk_callback_lock);
1809 static void sock_def_write_space(struct sock *sk)
1811 read_lock(&sk->sk_callback_lock);
1813 /* Do not wake up a writer until he can make "significant"
1816 if ((atomic_read(&sk->sk_wmem_alloc) << 1) <= sk->sk_sndbuf) {
1817 if (sk_has_sleeper(sk))
1818 wake_up_interruptible_sync_poll(sk->sk_sleep, POLLOUT |
1819 POLLWRNORM | POLLWRBAND);
1821 /* Should agree with poll, otherwise some programs break */
1822 if (sock_writeable(sk))
1823 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
1826 read_unlock(&sk->sk_callback_lock);
1829 static void sock_def_destruct(struct sock *sk)
1831 kfree(sk->sk_protinfo);
1834 void sk_send_sigurg(struct sock *sk)
1836 if (sk->sk_socket && sk->sk_socket->file)
1837 if (send_sigurg(&sk->sk_socket->file->f_owner))
1838 sk_wake_async(sk, SOCK_WAKE_URG, POLL_PRI);
1840 EXPORT_SYMBOL(sk_send_sigurg);
1842 void sk_reset_timer(struct sock *sk, struct timer_list* timer,
1843 unsigned long expires)
1845 if (!mod_timer(timer, expires))
1848 EXPORT_SYMBOL(sk_reset_timer);
1850 void sk_stop_timer(struct sock *sk, struct timer_list* timer)
1852 if (timer_pending(timer) && del_timer(timer))
1855 EXPORT_SYMBOL(sk_stop_timer);
1857 void sock_init_data(struct socket *sock, struct sock *sk)
1859 skb_queue_head_init(&sk->sk_receive_queue);
1860 skb_queue_head_init(&sk->sk_write_queue);
1861 skb_queue_head_init(&sk->sk_error_queue);
1862 #ifdef CONFIG_NET_DMA
1863 skb_queue_head_init(&sk->sk_async_wait_queue);
1866 sk->sk_send_head = NULL;
1868 init_timer(&sk->sk_timer);
1870 sk->sk_allocation = GFP_KERNEL;
1871 sk->sk_rcvbuf = sysctl_rmem_default;
1872 sk->sk_sndbuf = sysctl_wmem_default;
1873 sk->sk_state = TCP_CLOSE;
1874 sk_set_socket(sk, sock);
1876 sock_set_flag(sk, SOCK_ZAPPED);
1879 sk->sk_type = sock->type;
1880 sk->sk_sleep = &sock->wait;
1883 sk->sk_sleep = NULL;
1885 rwlock_init(&sk->sk_dst_lock);
1886 rwlock_init(&sk->sk_callback_lock);
1887 lockdep_set_class_and_name(&sk->sk_callback_lock,
1888 af_callback_keys + sk->sk_family,
1889 af_family_clock_key_strings[sk->sk_family]);
1891 sk->sk_state_change = sock_def_wakeup;
1892 sk->sk_data_ready = sock_def_readable;
1893 sk->sk_write_space = sock_def_write_space;
1894 sk->sk_error_report = sock_def_error_report;
1895 sk->sk_destruct = sock_def_destruct;
1897 sk->sk_sndmsg_page = NULL;
1898 sk->sk_sndmsg_off = 0;
1900 sk->sk_peercred.pid = 0;
1901 sk->sk_peercred.uid = -1;
1902 sk->sk_peercred.gid = -1;
1903 sk->sk_write_pending = 0;
1904 sk->sk_rcvlowat = 1;
1905 sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT;
1906 sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT;
1908 sk->sk_stamp = ktime_set(-1L, 0);
1911 * Before updating sk_refcnt, we must commit prior changes to memory
1912 * (Documentation/RCU/rculist_nulls.txt for details)
1915 atomic_set(&sk->sk_refcnt, 1);
1916 atomic_set(&sk->sk_drops, 0);
1918 EXPORT_SYMBOL(sock_init_data);
1920 void lock_sock_nested(struct sock *sk, int subclass)
1923 spin_lock_bh(&sk->sk_lock.slock);
1924 if (sk->sk_lock.owned)
1926 sk->sk_lock.owned = 1;
1927 spin_unlock(&sk->sk_lock.slock);
1929 * The sk_lock has mutex_lock() semantics here:
1931 mutex_acquire(&sk->sk_lock.dep_map, subclass, 0, _RET_IP_);
1934 EXPORT_SYMBOL(lock_sock_nested);
1936 void release_sock(struct sock *sk)
1939 * The sk_lock has mutex_unlock() semantics:
1941 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_);
1943 spin_lock_bh(&sk->sk_lock.slock);
1944 if (sk->sk_backlog.tail)
1946 sk->sk_lock.owned = 0;
1947 if (waitqueue_active(&sk->sk_lock.wq))
1948 wake_up(&sk->sk_lock.wq);
1949 spin_unlock_bh(&sk->sk_lock.slock);
1951 EXPORT_SYMBOL(release_sock);
1953 int sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp)
1956 if (!sock_flag(sk, SOCK_TIMESTAMP))
1957 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
1958 tv = ktime_to_timeval(sk->sk_stamp);
1959 if (tv.tv_sec == -1)
1961 if (tv.tv_sec == 0) {
1962 sk->sk_stamp = ktime_get_real();
1963 tv = ktime_to_timeval(sk->sk_stamp);
1965 return copy_to_user(userstamp, &tv, sizeof(tv)) ? -EFAULT : 0;
1967 EXPORT_SYMBOL(sock_get_timestamp);
1969 int sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp)
1972 if (!sock_flag(sk, SOCK_TIMESTAMP))
1973 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
1974 ts = ktime_to_timespec(sk->sk_stamp);
1975 if (ts.tv_sec == -1)
1977 if (ts.tv_sec == 0) {
1978 sk->sk_stamp = ktime_get_real();
1979 ts = ktime_to_timespec(sk->sk_stamp);
1981 return copy_to_user(userstamp, &ts, sizeof(ts)) ? -EFAULT : 0;
1983 EXPORT_SYMBOL(sock_get_timestampns);
1985 void sock_enable_timestamp(struct sock *sk, int flag)
1987 if (!sock_flag(sk, flag)) {
1988 sock_set_flag(sk, flag);
1990 * we just set one of the two flags which require net
1991 * time stamping, but time stamping might have been on
1992 * already because of the other one
1995 flag == SOCK_TIMESTAMP ?
1996 SOCK_TIMESTAMPING_RX_SOFTWARE :
1998 net_enable_timestamp();
2003 * Get a socket option on an socket.
2005 * FIX: POSIX 1003.1g is very ambiguous here. It states that
2006 * asynchronous errors should be reported by getsockopt. We assume
2007 * this means if you specify SO_ERROR (otherwise whats the point of it).
2009 int sock_common_getsockopt(struct socket *sock, int level, int optname,
2010 char __user *optval, int __user *optlen)
2012 struct sock *sk = sock->sk;
2014 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
2016 EXPORT_SYMBOL(sock_common_getsockopt);
2018 #ifdef CONFIG_COMPAT
2019 int compat_sock_common_getsockopt(struct socket *sock, int level, int optname,
2020 char __user *optval, int __user *optlen)
2022 struct sock *sk = sock->sk;
2024 if (sk->sk_prot->compat_getsockopt != NULL)
2025 return sk->sk_prot->compat_getsockopt(sk, level, optname,
2027 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
2029 EXPORT_SYMBOL(compat_sock_common_getsockopt);
2032 int sock_common_recvmsg(struct kiocb *iocb, struct socket *sock,
2033 struct msghdr *msg, size_t size, int flags)
2035 struct sock *sk = sock->sk;
2039 err = sk->sk_prot->recvmsg(iocb, sk, msg, size, flags & MSG_DONTWAIT,
2040 flags & ~MSG_DONTWAIT, &addr_len);
2042 msg->msg_namelen = addr_len;
2045 EXPORT_SYMBOL(sock_common_recvmsg);
2048 * Set socket options on an inet socket.
2050 int sock_common_setsockopt(struct socket *sock, int level, int optname,
2051 char __user *optval, unsigned int optlen)
2053 struct sock *sk = sock->sk;
2055 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
2057 EXPORT_SYMBOL(sock_common_setsockopt);
2059 #ifdef CONFIG_COMPAT
2060 int compat_sock_common_setsockopt(struct socket *sock, int level, int optname,
2061 char __user *optval, unsigned int optlen)
2063 struct sock *sk = sock->sk;
2065 if (sk->sk_prot->compat_setsockopt != NULL)
2066 return sk->sk_prot->compat_setsockopt(sk, level, optname,
2068 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
2070 EXPORT_SYMBOL(compat_sock_common_setsockopt);
2073 void sk_common_release(struct sock *sk)
2075 if (sk->sk_prot->destroy)
2076 sk->sk_prot->destroy(sk);
2079 * Observation: when sock_common_release is called, processes have
2080 * no access to socket. But net still has.
2081 * Step one, detach it from networking:
2083 * A. Remove from hash tables.
2086 sk->sk_prot->unhash(sk);
2089 * In this point socket cannot receive new packets, but it is possible
2090 * that some packets are in flight because some CPU runs receiver and
2091 * did hash table lookup before we unhashed socket. They will achieve
2092 * receive queue and will be purged by socket destructor.
2094 * Also we still have packets pending on receive queue and probably,
2095 * our own packets waiting in device queues. sock_destroy will drain
2096 * receive queue, but transmitted packets will delay socket destruction
2097 * until the last reference will be released.
2102 xfrm_sk_free_policy(sk);
2104 sk_refcnt_debug_release(sk);
2107 EXPORT_SYMBOL(sk_common_release);
2109 static DEFINE_RWLOCK(proto_list_lock);
2110 static LIST_HEAD(proto_list);
2112 #ifdef CONFIG_PROC_FS
2113 #define PROTO_INUSE_NR 64 /* should be enough for the first time */
2115 int val[PROTO_INUSE_NR];
2118 static DECLARE_BITMAP(proto_inuse_idx, PROTO_INUSE_NR);
2120 #ifdef CONFIG_NET_NS
2121 void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
2123 int cpu = smp_processor_id();
2124 per_cpu_ptr(net->core.inuse, cpu)->val[prot->inuse_idx] += val;
2126 EXPORT_SYMBOL_GPL(sock_prot_inuse_add);
2128 int sock_prot_inuse_get(struct net *net, struct proto *prot)
2130 int cpu, idx = prot->inuse_idx;
2133 for_each_possible_cpu(cpu)
2134 res += per_cpu_ptr(net->core.inuse, cpu)->val[idx];
2136 return res >= 0 ? res : 0;
2138 EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
2140 static int sock_inuse_init_net(struct net *net)
2142 net->core.inuse = alloc_percpu(struct prot_inuse);
2143 return net->core.inuse ? 0 : -ENOMEM;
2146 static void sock_inuse_exit_net(struct net *net)
2148 free_percpu(net->core.inuse);
2151 static struct pernet_operations net_inuse_ops = {
2152 .init = sock_inuse_init_net,
2153 .exit = sock_inuse_exit_net,
2156 static __init int net_inuse_init(void)
2158 if (register_pernet_subsys(&net_inuse_ops))
2159 panic("Cannot initialize net inuse counters");
2164 core_initcall(net_inuse_init);
2166 static DEFINE_PER_CPU(struct prot_inuse, prot_inuse);
2168 void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
2170 __get_cpu_var(prot_inuse).val[prot->inuse_idx] += val;
2172 EXPORT_SYMBOL_GPL(sock_prot_inuse_add);
2174 int sock_prot_inuse_get(struct net *net, struct proto *prot)
2176 int cpu, idx = prot->inuse_idx;
2179 for_each_possible_cpu(cpu)
2180 res += per_cpu(prot_inuse, cpu).val[idx];
2182 return res >= 0 ? res : 0;
2184 EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
2187 static void assign_proto_idx(struct proto *prot)
2189 prot->inuse_idx = find_first_zero_bit(proto_inuse_idx, PROTO_INUSE_NR);
2191 if (unlikely(prot->inuse_idx == PROTO_INUSE_NR - 1)) {
2192 printk(KERN_ERR "PROTO_INUSE_NR exhausted\n");
2196 set_bit(prot->inuse_idx, proto_inuse_idx);
2199 static void release_proto_idx(struct proto *prot)
2201 if (prot->inuse_idx != PROTO_INUSE_NR - 1)
2202 clear_bit(prot->inuse_idx, proto_inuse_idx);
2205 static inline void assign_proto_idx(struct proto *prot)
2209 static inline void release_proto_idx(struct proto *prot)
2214 int proto_register(struct proto *prot, int alloc_slab)
2217 prot->slab = kmem_cache_create(prot->name, prot->obj_size, 0,
2218 SLAB_HWCACHE_ALIGN | prot->slab_flags,
2221 if (prot->slab == NULL) {
2222 printk(KERN_CRIT "%s: Can't create sock SLAB cache!\n",
2227 if (prot->rsk_prot != NULL) {
2228 static const char mask[] = "request_sock_%s";
2230 prot->rsk_prot->slab_name = kmalloc(strlen(prot->name) + sizeof(mask) - 1, GFP_KERNEL);
2231 if (prot->rsk_prot->slab_name == NULL)
2232 goto out_free_sock_slab;
2234 sprintf(prot->rsk_prot->slab_name, mask, prot->name);
2235 prot->rsk_prot->slab = kmem_cache_create(prot->rsk_prot->slab_name,
2236 prot->rsk_prot->obj_size, 0,
2237 SLAB_HWCACHE_ALIGN, NULL);
2239 if (prot->rsk_prot->slab == NULL) {
2240 printk(KERN_CRIT "%s: Can't create request sock SLAB cache!\n",
2242 goto out_free_request_sock_slab_name;
2246 if (prot->twsk_prot != NULL) {
2247 static const char mask[] = "tw_sock_%s";
2249 prot->twsk_prot->twsk_slab_name = kmalloc(strlen(prot->name) + sizeof(mask) - 1, GFP_KERNEL);
2251 if (prot->twsk_prot->twsk_slab_name == NULL)
2252 goto out_free_request_sock_slab;
2254 sprintf(prot->twsk_prot->twsk_slab_name, mask, prot->name);
2255 prot->twsk_prot->twsk_slab =
2256 kmem_cache_create(prot->twsk_prot->twsk_slab_name,
2257 prot->twsk_prot->twsk_obj_size,
2259 SLAB_HWCACHE_ALIGN |
2262 if (prot->twsk_prot->twsk_slab == NULL)
2263 goto out_free_timewait_sock_slab_name;
2267 write_lock(&proto_list_lock);
2268 list_add(&prot->node, &proto_list);
2269 assign_proto_idx(prot);
2270 write_unlock(&proto_list_lock);
2273 out_free_timewait_sock_slab_name:
2274 kfree(prot->twsk_prot->twsk_slab_name);
2275 out_free_request_sock_slab:
2276 if (prot->rsk_prot && prot->rsk_prot->slab) {
2277 kmem_cache_destroy(prot->rsk_prot->slab);
2278 prot->rsk_prot->slab = NULL;
2280 out_free_request_sock_slab_name:
2281 kfree(prot->rsk_prot->slab_name);
2283 kmem_cache_destroy(prot->slab);
2288 EXPORT_SYMBOL(proto_register);
2290 void proto_unregister(struct proto *prot)
2292 write_lock(&proto_list_lock);
2293 release_proto_idx(prot);
2294 list_del(&prot->node);
2295 write_unlock(&proto_list_lock);
2297 if (prot->slab != NULL) {
2298 kmem_cache_destroy(prot->slab);
2302 if (prot->rsk_prot != NULL && prot->rsk_prot->slab != NULL) {
2303 kmem_cache_destroy(prot->rsk_prot->slab);
2304 kfree(prot->rsk_prot->slab_name);
2305 prot->rsk_prot->slab = NULL;
2308 if (prot->twsk_prot != NULL && prot->twsk_prot->twsk_slab != NULL) {
2309 kmem_cache_destroy(prot->twsk_prot->twsk_slab);
2310 kfree(prot->twsk_prot->twsk_slab_name);
2311 prot->twsk_prot->twsk_slab = NULL;
2314 EXPORT_SYMBOL(proto_unregister);
2316 #ifdef CONFIG_PROC_FS
2317 static void *proto_seq_start(struct seq_file *seq, loff_t *pos)
2318 __acquires(proto_list_lock)
2320 read_lock(&proto_list_lock);
2321 return seq_list_start_head(&proto_list, *pos);
2324 static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2326 return seq_list_next(v, &proto_list, pos);
2329 static void proto_seq_stop(struct seq_file *seq, void *v)
2330 __releases(proto_list_lock)
2332 read_unlock(&proto_list_lock);
2335 static char proto_method_implemented(const void *method)
2337 return method == NULL ? 'n' : 'y';
2340 static void proto_seq_printf(struct seq_file *seq, struct proto *proto)
2342 seq_printf(seq, "%-9s %4u %6d %6d %-3s %6u %-3s %-10s "
2343 "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n",
2346 sock_prot_inuse_get(seq_file_net(seq), proto),
2347 proto->memory_allocated != NULL ? atomic_read(proto->memory_allocated) : -1,
2348 proto->memory_pressure != NULL ? *proto->memory_pressure ? "yes" : "no" : "NI",
2350 proto->slab == NULL ? "no" : "yes",
2351 module_name(proto->owner),
2352 proto_method_implemented(proto->close),
2353 proto_method_implemented(proto->connect),
2354 proto_method_implemented(proto->disconnect),
2355 proto_method_implemented(proto->accept),
2356 proto_method_implemented(proto->ioctl),
2357 proto_method_implemented(proto->init),
2358 proto_method_implemented(proto->destroy),
2359 proto_method_implemented(proto->shutdown),
2360 proto_method_implemented(proto->setsockopt),
2361 proto_method_implemented(proto->getsockopt),
2362 proto_method_implemented(proto->sendmsg),
2363 proto_method_implemented(proto->recvmsg),
2364 proto_method_implemented(proto->sendpage),
2365 proto_method_implemented(proto->bind),
2366 proto_method_implemented(proto->backlog_rcv),
2367 proto_method_implemented(proto->hash),
2368 proto_method_implemented(proto->unhash),
2369 proto_method_implemented(proto->get_port),
2370 proto_method_implemented(proto->enter_memory_pressure));
2373 static int proto_seq_show(struct seq_file *seq, void *v)
2375 if (v == &proto_list)
2376 seq_printf(seq, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s",
2385 "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n");
2387 proto_seq_printf(seq, list_entry(v, struct proto, node));
2391 static const struct seq_operations proto_seq_ops = {
2392 .start = proto_seq_start,
2393 .next = proto_seq_next,
2394 .stop = proto_seq_stop,
2395 .show = proto_seq_show,
2398 static int proto_seq_open(struct inode *inode, struct file *file)
2400 return seq_open_net(inode, file, &proto_seq_ops,
2401 sizeof(struct seq_net_private));
2404 static const struct file_operations proto_seq_fops = {
2405 .owner = THIS_MODULE,
2406 .open = proto_seq_open,
2408 .llseek = seq_lseek,
2409 .release = seq_release_net,
2412 static __net_init int proto_init_net(struct net *net)
2414 if (!proc_net_fops_create(net, "protocols", S_IRUGO, &proto_seq_fops))
2420 static __net_exit void proto_exit_net(struct net *net)
2422 proc_net_remove(net, "protocols");
2426 static __net_initdata struct pernet_operations proto_net_ops = {
2427 .init = proto_init_net,
2428 .exit = proto_exit_net,
2431 static int __init proto_init(void)
2433 return register_pernet_subsys(&proto_net_ops);
2436 subsys_initcall(proto_init);
2438 #endif /* PROC_FS */