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) {
291 err = sk_filter(sk, skb);
295 if (!sk_rmem_schedule(sk, skb->truesize)) {
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);
320 EXPORT_SYMBOL(sock_queue_rcv_skb);
322 int sk_receive_skb(struct sock *sk, struct sk_buff *skb, const int nested)
324 int rc = NET_RX_SUCCESS;
326 if (sk_filter(sk, skb))
327 goto discard_and_relse;
332 bh_lock_sock_nested(sk);
335 if (!sock_owned_by_user(sk)) {
337 * trylock + unlock semantics:
339 mutex_acquire(&sk->sk_lock.dep_map, 0, 1, _RET_IP_);
341 rc = sk_backlog_rcv(sk, skb);
343 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_);
345 sk_add_backlog(sk, skb);
354 EXPORT_SYMBOL(sk_receive_skb);
356 struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie)
358 struct dst_entry *dst = sk->sk_dst_cache;
360 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
361 sk->sk_dst_cache = NULL;
368 EXPORT_SYMBOL(__sk_dst_check);
370 struct dst_entry *sk_dst_check(struct sock *sk, u32 cookie)
372 struct dst_entry *dst = sk_dst_get(sk);
374 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
382 EXPORT_SYMBOL(sk_dst_check);
384 static int sock_bindtodevice(struct sock *sk, char __user *optval, int optlen)
386 int ret = -ENOPROTOOPT;
387 #ifdef CONFIG_NETDEVICES
388 struct net *net = sock_net(sk);
389 char devname[IFNAMSIZ];
394 if (!capable(CAP_NET_RAW))
401 /* Bind this socket to a particular device like "eth0",
402 * as specified in the passed interface name. If the
403 * name is "" or the option length is zero the socket
406 if (optlen > IFNAMSIZ - 1)
407 optlen = IFNAMSIZ - 1;
408 memset(devname, 0, sizeof(devname));
411 if (copy_from_user(devname, optval, optlen))
414 if (devname[0] == '\0') {
417 struct net_device *dev = dev_get_by_name(net, devname);
423 index = dev->ifindex;
428 sk->sk_bound_dev_if = index;
440 static inline void sock_valbool_flag(struct sock *sk, int bit, int valbool)
443 sock_set_flag(sk, bit);
445 sock_reset_flag(sk, bit);
449 * This is meant for all protocols to use and covers goings on
450 * at the socket level. Everything here is generic.
453 int sock_setsockopt(struct socket *sock, int level, int optname,
454 char __user *optval, unsigned int optlen)
456 struct sock *sk = sock->sk;
463 * Options without arguments
466 if (optname == SO_BINDTODEVICE)
467 return sock_bindtodevice(sk, optval, optlen);
469 if (optlen < sizeof(int))
472 if (get_user(val, (int __user *)optval))
475 valbool = val ? 1 : 0;
481 if (val && !capable(CAP_NET_ADMIN))
484 sock_valbool_flag(sk, SOCK_DBG, valbool);
487 sk->sk_reuse = valbool;
496 sock_valbool_flag(sk, SOCK_LOCALROUTE, valbool);
499 sock_valbool_flag(sk, SOCK_BROADCAST, valbool);
502 /* Don't error on this BSD doesn't and if you think
503 about it this is right. Otherwise apps have to
504 play 'guess the biggest size' games. RCVBUF/SNDBUF
505 are treated in BSD as hints */
507 if (val > sysctl_wmem_max)
508 val = sysctl_wmem_max;
510 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
511 if ((val * 2) < SOCK_MIN_SNDBUF)
512 sk->sk_sndbuf = SOCK_MIN_SNDBUF;
514 sk->sk_sndbuf = val * 2;
517 * Wake up sending tasks if we
520 sk->sk_write_space(sk);
524 if (!capable(CAP_NET_ADMIN)) {
531 /* Don't error on this BSD doesn't and if you think
532 about it this is right. Otherwise apps have to
533 play 'guess the biggest size' games. RCVBUF/SNDBUF
534 are treated in BSD as hints */
536 if (val > sysctl_rmem_max)
537 val = sysctl_rmem_max;
539 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
541 * We double it on the way in to account for
542 * "struct sk_buff" etc. overhead. Applications
543 * assume that the SO_RCVBUF setting they make will
544 * allow that much actual data to be received on that
547 * Applications are unaware that "struct sk_buff" and
548 * other overheads allocate from the receive buffer
549 * during socket buffer allocation.
551 * And after considering the possible alternatives,
552 * returning the value we actually used in getsockopt
553 * is the most desirable behavior.
555 if ((val * 2) < SOCK_MIN_RCVBUF)
556 sk->sk_rcvbuf = SOCK_MIN_RCVBUF;
558 sk->sk_rcvbuf = val * 2;
562 if (!capable(CAP_NET_ADMIN)) {
570 if (sk->sk_protocol == IPPROTO_TCP)
571 tcp_set_keepalive(sk, valbool);
573 sock_valbool_flag(sk, SOCK_KEEPOPEN, valbool);
577 sock_valbool_flag(sk, SOCK_URGINLINE, valbool);
581 sk->sk_no_check = valbool;
585 if ((val >= 0 && val <= 6) || capable(CAP_NET_ADMIN))
586 sk->sk_priority = val;
592 if (optlen < sizeof(ling)) {
593 ret = -EINVAL; /* 1003.1g */
596 if (copy_from_user(&ling, optval, sizeof(ling))) {
601 sock_reset_flag(sk, SOCK_LINGER);
603 #if (BITS_PER_LONG == 32)
604 if ((unsigned int)ling.l_linger >= MAX_SCHEDULE_TIMEOUT/HZ)
605 sk->sk_lingertime = MAX_SCHEDULE_TIMEOUT;
608 sk->sk_lingertime = (unsigned int)ling.l_linger * HZ;
609 sock_set_flag(sk, SOCK_LINGER);
614 sock_warn_obsolete_bsdism("setsockopt");
619 set_bit(SOCK_PASSCRED, &sock->flags);
621 clear_bit(SOCK_PASSCRED, &sock->flags);
627 if (optname == SO_TIMESTAMP)
628 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
630 sock_set_flag(sk, SOCK_RCVTSTAMPNS);
631 sock_set_flag(sk, SOCK_RCVTSTAMP);
632 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
634 sock_reset_flag(sk, SOCK_RCVTSTAMP);
635 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
639 case SO_TIMESTAMPING:
640 if (val & ~SOF_TIMESTAMPING_MASK) {
644 sock_valbool_flag(sk, SOCK_TIMESTAMPING_TX_HARDWARE,
645 val & SOF_TIMESTAMPING_TX_HARDWARE);
646 sock_valbool_flag(sk, SOCK_TIMESTAMPING_TX_SOFTWARE,
647 val & SOF_TIMESTAMPING_TX_SOFTWARE);
648 sock_valbool_flag(sk, SOCK_TIMESTAMPING_RX_HARDWARE,
649 val & SOF_TIMESTAMPING_RX_HARDWARE);
650 if (val & SOF_TIMESTAMPING_RX_SOFTWARE)
651 sock_enable_timestamp(sk,
652 SOCK_TIMESTAMPING_RX_SOFTWARE);
654 sock_disable_timestamp(sk,
655 SOCK_TIMESTAMPING_RX_SOFTWARE);
656 sock_valbool_flag(sk, SOCK_TIMESTAMPING_SOFTWARE,
657 val & SOF_TIMESTAMPING_SOFTWARE);
658 sock_valbool_flag(sk, SOCK_TIMESTAMPING_SYS_HARDWARE,
659 val & SOF_TIMESTAMPING_SYS_HARDWARE);
660 sock_valbool_flag(sk, SOCK_TIMESTAMPING_RAW_HARDWARE,
661 val & SOF_TIMESTAMPING_RAW_HARDWARE);
667 sk->sk_rcvlowat = val ? : 1;
671 ret = sock_set_timeout(&sk->sk_rcvtimeo, optval, optlen);
675 ret = sock_set_timeout(&sk->sk_sndtimeo, optval, optlen);
678 case SO_ATTACH_FILTER:
680 if (optlen == sizeof(struct sock_fprog)) {
681 struct sock_fprog fprog;
684 if (copy_from_user(&fprog, optval, sizeof(fprog)))
687 ret = sk_attach_filter(&fprog, sk);
691 case SO_DETACH_FILTER:
692 ret = sk_detach_filter(sk);
697 set_bit(SOCK_PASSSEC, &sock->flags);
699 clear_bit(SOCK_PASSSEC, &sock->flags);
702 if (!capable(CAP_NET_ADMIN))
708 /* We implement the SO_SNDLOWAT etc to
709 not be settable (1003.1g 5.3) */
712 sock_set_flag(sk, SOCK_RXQ_OVFL);
714 sock_reset_flag(sk, SOCK_RXQ_OVFL);
723 EXPORT_SYMBOL(sock_setsockopt);
726 int sock_getsockopt(struct socket *sock, int level, int optname,
727 char __user *optval, int __user *optlen)
729 struct sock *sk = sock->sk;
737 unsigned int lv = sizeof(int);
740 if (get_user(len, optlen))
745 memset(&v, 0, sizeof(v));
749 v.val = sock_flag(sk, SOCK_DBG);
753 v.val = sock_flag(sk, SOCK_LOCALROUTE);
757 v.val = !!sock_flag(sk, SOCK_BROADCAST);
761 v.val = sk->sk_sndbuf;
765 v.val = sk->sk_rcvbuf;
769 v.val = sk->sk_reuse;
773 v.val = !!sock_flag(sk, SOCK_KEEPOPEN);
781 v.val = sk->sk_protocol;
785 v.val = sk->sk_family;
789 v.val = -sock_error(sk);
791 v.val = xchg(&sk->sk_err_soft, 0);
795 v.val = !!sock_flag(sk, SOCK_URGINLINE);
799 v.val = sk->sk_no_check;
803 v.val = sk->sk_priority;
808 v.ling.l_onoff = !!sock_flag(sk, SOCK_LINGER);
809 v.ling.l_linger = sk->sk_lingertime / HZ;
813 sock_warn_obsolete_bsdism("getsockopt");
817 v.val = sock_flag(sk, SOCK_RCVTSTAMP) &&
818 !sock_flag(sk, SOCK_RCVTSTAMPNS);
822 v.val = sock_flag(sk, SOCK_RCVTSTAMPNS);
825 case SO_TIMESTAMPING:
827 if (sock_flag(sk, SOCK_TIMESTAMPING_TX_HARDWARE))
828 v.val |= SOF_TIMESTAMPING_TX_HARDWARE;
829 if (sock_flag(sk, SOCK_TIMESTAMPING_TX_SOFTWARE))
830 v.val |= SOF_TIMESTAMPING_TX_SOFTWARE;
831 if (sock_flag(sk, SOCK_TIMESTAMPING_RX_HARDWARE))
832 v.val |= SOF_TIMESTAMPING_RX_HARDWARE;
833 if (sock_flag(sk, SOCK_TIMESTAMPING_RX_SOFTWARE))
834 v.val |= SOF_TIMESTAMPING_RX_SOFTWARE;
835 if (sock_flag(sk, SOCK_TIMESTAMPING_SOFTWARE))
836 v.val |= SOF_TIMESTAMPING_SOFTWARE;
837 if (sock_flag(sk, SOCK_TIMESTAMPING_SYS_HARDWARE))
838 v.val |= SOF_TIMESTAMPING_SYS_HARDWARE;
839 if (sock_flag(sk, SOCK_TIMESTAMPING_RAW_HARDWARE))
840 v.val |= SOF_TIMESTAMPING_RAW_HARDWARE;
844 lv = sizeof(struct timeval);
845 if (sk->sk_rcvtimeo == MAX_SCHEDULE_TIMEOUT) {
849 v.tm.tv_sec = sk->sk_rcvtimeo / HZ;
850 v.tm.tv_usec = ((sk->sk_rcvtimeo % HZ) * 1000000) / HZ;
855 lv = sizeof(struct timeval);
856 if (sk->sk_sndtimeo == MAX_SCHEDULE_TIMEOUT) {
860 v.tm.tv_sec = sk->sk_sndtimeo / HZ;
861 v.tm.tv_usec = ((sk->sk_sndtimeo % HZ) * 1000000) / HZ;
866 v.val = sk->sk_rcvlowat;
874 v.val = test_bit(SOCK_PASSCRED, &sock->flags) ? 1 : 0;
878 if (len > sizeof(sk->sk_peercred))
879 len = sizeof(sk->sk_peercred);
880 if (copy_to_user(optval, &sk->sk_peercred, len))
888 if (sock->ops->getname(sock, (struct sockaddr *)address, &lv, 2))
892 if (copy_to_user(optval, address, len))
897 /* Dubious BSD thing... Probably nobody even uses it, but
898 * the UNIX standard wants it for whatever reason... -DaveM
901 v.val = sk->sk_state == TCP_LISTEN;
905 v.val = test_bit(SOCK_PASSSEC, &sock->flags) ? 1 : 0;
909 return security_socket_getpeersec_stream(sock, optval, optlen, len);
916 v.val = !!sock_flag(sk, SOCK_RXQ_OVFL);
925 if (copy_to_user(optval, &v, len))
928 if (put_user(len, optlen))
934 * Initialize an sk_lock.
936 * (We also register the sk_lock with the lock validator.)
938 static inline void sock_lock_init(struct sock *sk)
940 sock_lock_init_class_and_name(sk,
941 af_family_slock_key_strings[sk->sk_family],
942 af_family_slock_keys + sk->sk_family,
943 af_family_key_strings[sk->sk_family],
944 af_family_keys + sk->sk_family);
948 * Copy all fields from osk to nsk but nsk->sk_refcnt must not change yet,
949 * even temporarly, because of RCU lookups. sk_node should also be left as is.
951 static void sock_copy(struct sock *nsk, const struct sock *osk)
953 #ifdef CONFIG_SECURITY_NETWORK
954 void *sptr = nsk->sk_security;
956 BUILD_BUG_ON(offsetof(struct sock, sk_copy_start) !=
957 sizeof(osk->sk_node) + sizeof(osk->sk_refcnt));
958 memcpy(&nsk->sk_copy_start, &osk->sk_copy_start,
959 osk->sk_prot->obj_size - offsetof(struct sock, sk_copy_start));
960 #ifdef CONFIG_SECURITY_NETWORK
961 nsk->sk_security = sptr;
962 security_sk_clone(osk, nsk);
966 static struct sock *sk_prot_alloc(struct proto *prot, gfp_t priority,
970 struct kmem_cache *slab;
974 sk = kmem_cache_alloc(slab, priority & ~__GFP_ZERO);
977 if (priority & __GFP_ZERO) {
979 * caches using SLAB_DESTROY_BY_RCU should let
980 * sk_node.next un-modified. Special care is taken
981 * when initializing object to zero.
983 if (offsetof(struct sock, sk_node.next) != 0)
984 memset(sk, 0, offsetof(struct sock, sk_node.next));
985 memset(&sk->sk_node.pprev, 0,
986 prot->obj_size - offsetof(struct sock,
991 sk = kmalloc(prot->obj_size, priority);
994 kmemcheck_annotate_bitfield(sk, flags);
996 if (security_sk_alloc(sk, family, priority))
999 if (!try_module_get(prot->owner))
1006 security_sk_free(sk);
1009 kmem_cache_free(slab, sk);
1015 static void sk_prot_free(struct proto *prot, struct sock *sk)
1017 struct kmem_cache *slab;
1018 struct module *owner;
1020 owner = prot->owner;
1023 security_sk_free(sk);
1025 kmem_cache_free(slab, sk);
1032 * sk_alloc - All socket objects are allocated here
1033 * @net: the applicable net namespace
1034 * @family: protocol family
1035 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
1036 * @prot: struct proto associated with this new sock instance
1038 struct sock *sk_alloc(struct net *net, int family, gfp_t priority,
1043 sk = sk_prot_alloc(prot, priority | __GFP_ZERO, family);
1045 sk->sk_family = family;
1047 * See comment in struct sock definition to understand
1048 * why we need sk_prot_creator -acme
1050 sk->sk_prot = sk->sk_prot_creator = prot;
1052 sock_net_set(sk, get_net(net));
1053 atomic_set(&sk->sk_wmem_alloc, 1);
1058 EXPORT_SYMBOL(sk_alloc);
1060 static void __sk_free(struct sock *sk)
1062 struct sk_filter *filter;
1064 if (sk->sk_destruct)
1065 sk->sk_destruct(sk);
1067 filter = rcu_dereference(sk->sk_filter);
1069 sk_filter_uncharge(sk, filter);
1070 rcu_assign_pointer(sk->sk_filter, NULL);
1073 sock_disable_timestamp(sk, SOCK_TIMESTAMP);
1074 sock_disable_timestamp(sk, SOCK_TIMESTAMPING_RX_SOFTWARE);
1076 if (atomic_read(&sk->sk_omem_alloc))
1077 printk(KERN_DEBUG "%s: optmem leakage (%d bytes) detected.\n",
1078 __func__, atomic_read(&sk->sk_omem_alloc));
1080 put_net(sock_net(sk));
1081 sk_prot_free(sk->sk_prot_creator, sk);
1084 void sk_free(struct sock *sk)
1087 * We substract one from sk_wmem_alloc and can know if
1088 * some packets are still in some tx queue.
1089 * If not null, sock_wfree() will call __sk_free(sk) later
1091 if (atomic_dec_and_test(&sk->sk_wmem_alloc))
1094 EXPORT_SYMBOL(sk_free);
1097 * Last sock_put should drop referrence to sk->sk_net. It has already
1098 * been dropped in sk_change_net. Taking referrence to stopping namespace
1100 * Take referrence to a socket to remove it from hash _alive_ and after that
1101 * destroy it in the context of init_net.
1103 void sk_release_kernel(struct sock *sk)
1105 if (sk == NULL || sk->sk_socket == NULL)
1109 sock_release(sk->sk_socket);
1110 release_net(sock_net(sk));
1111 sock_net_set(sk, get_net(&init_net));
1114 EXPORT_SYMBOL(sk_release_kernel);
1116 struct sock *sk_clone(const struct sock *sk, const gfp_t priority)
1120 newsk = sk_prot_alloc(sk->sk_prot, priority, sk->sk_family);
1121 if (newsk != NULL) {
1122 struct sk_filter *filter;
1124 sock_copy(newsk, sk);
1127 get_net(sock_net(newsk));
1128 sk_node_init(&newsk->sk_node);
1129 sock_lock_init(newsk);
1130 bh_lock_sock(newsk);
1131 newsk->sk_backlog.head = newsk->sk_backlog.tail = NULL;
1133 atomic_set(&newsk->sk_rmem_alloc, 0);
1135 * sk_wmem_alloc set to one (see sk_free() and sock_wfree())
1137 atomic_set(&newsk->sk_wmem_alloc, 1);
1138 atomic_set(&newsk->sk_omem_alloc, 0);
1139 skb_queue_head_init(&newsk->sk_receive_queue);
1140 skb_queue_head_init(&newsk->sk_write_queue);
1141 #ifdef CONFIG_NET_DMA
1142 skb_queue_head_init(&newsk->sk_async_wait_queue);
1145 rwlock_init(&newsk->sk_dst_lock);
1146 rwlock_init(&newsk->sk_callback_lock);
1147 lockdep_set_class_and_name(&newsk->sk_callback_lock,
1148 af_callback_keys + newsk->sk_family,
1149 af_family_clock_key_strings[newsk->sk_family]);
1151 newsk->sk_dst_cache = NULL;
1152 newsk->sk_wmem_queued = 0;
1153 newsk->sk_forward_alloc = 0;
1154 newsk->sk_send_head = NULL;
1155 newsk->sk_userlocks = sk->sk_userlocks & ~SOCK_BINDPORT_LOCK;
1157 sock_reset_flag(newsk, SOCK_DONE);
1158 skb_queue_head_init(&newsk->sk_error_queue);
1160 filter = newsk->sk_filter;
1162 sk_filter_charge(newsk, filter);
1164 if (unlikely(xfrm_sk_clone_policy(newsk))) {
1165 /* It is still raw copy of parent, so invalidate
1166 * destructor and make plain sk_free() */
1167 newsk->sk_destruct = NULL;
1174 newsk->sk_priority = 0;
1176 * Before updating sk_refcnt, we must commit prior changes to memory
1177 * (Documentation/RCU/rculist_nulls.txt for details)
1180 atomic_set(&newsk->sk_refcnt, 2);
1183 * Increment the counter in the same struct proto as the master
1184 * sock (sk_refcnt_debug_inc uses newsk->sk_prot->socks, that
1185 * is the same as sk->sk_prot->socks, as this field was copied
1188 * This _changes_ the previous behaviour, where
1189 * tcp_create_openreq_child always was incrementing the
1190 * equivalent to tcp_prot->socks (inet_sock_nr), so this have
1191 * to be taken into account in all callers. -acme
1193 sk_refcnt_debug_inc(newsk);
1194 sk_set_socket(newsk, NULL);
1195 newsk->sk_sleep = NULL;
1197 if (newsk->sk_prot->sockets_allocated)
1198 percpu_counter_inc(newsk->sk_prot->sockets_allocated);
1203 EXPORT_SYMBOL_GPL(sk_clone);
1205 void sk_setup_caps(struct sock *sk, struct dst_entry *dst)
1207 __sk_dst_set(sk, dst);
1208 sk->sk_route_caps = dst->dev->features;
1209 if (sk->sk_route_caps & NETIF_F_GSO)
1210 sk->sk_route_caps |= NETIF_F_GSO_SOFTWARE;
1211 if (sk_can_gso(sk)) {
1212 if (dst->header_len) {
1213 sk->sk_route_caps &= ~NETIF_F_GSO_MASK;
1215 sk->sk_route_caps |= NETIF_F_SG | NETIF_F_HW_CSUM;
1216 sk->sk_gso_max_size = dst->dev->gso_max_size;
1220 EXPORT_SYMBOL_GPL(sk_setup_caps);
1222 void __init sk_init(void)
1224 if (totalram_pages <= 4096) {
1225 sysctl_wmem_max = 32767;
1226 sysctl_rmem_max = 32767;
1227 sysctl_wmem_default = 32767;
1228 sysctl_rmem_default = 32767;
1229 } else if (totalram_pages >= 131072) {
1230 sysctl_wmem_max = 131071;
1231 sysctl_rmem_max = 131071;
1236 * Simple resource managers for sockets.
1241 * Write buffer destructor automatically called from kfree_skb.
1243 void sock_wfree(struct sk_buff *skb)
1245 struct sock *sk = skb->sk;
1246 unsigned int len = skb->truesize;
1248 if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE)) {
1250 * Keep a reference on sk_wmem_alloc, this will be released
1251 * after sk_write_space() call
1253 atomic_sub(len - 1, &sk->sk_wmem_alloc);
1254 sk->sk_write_space(sk);
1258 * if sk_wmem_alloc reaches 0, we must finish what sk_free()
1259 * could not do because of in-flight packets
1261 if (atomic_sub_and_test(len, &sk->sk_wmem_alloc))
1264 EXPORT_SYMBOL(sock_wfree);
1267 * Read buffer destructor automatically called from kfree_skb.
1269 void sock_rfree(struct sk_buff *skb)
1271 struct sock *sk = skb->sk;
1273 atomic_sub(skb->truesize, &sk->sk_rmem_alloc);
1274 sk_mem_uncharge(skb->sk, skb->truesize);
1276 EXPORT_SYMBOL(sock_rfree);
1279 int sock_i_uid(struct sock *sk)
1283 read_lock(&sk->sk_callback_lock);
1284 uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : 0;
1285 read_unlock(&sk->sk_callback_lock);
1288 EXPORT_SYMBOL(sock_i_uid);
1290 unsigned long sock_i_ino(struct sock *sk)
1294 read_lock(&sk->sk_callback_lock);
1295 ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0;
1296 read_unlock(&sk->sk_callback_lock);
1299 EXPORT_SYMBOL(sock_i_ino);
1302 * Allocate a skb from the socket's send buffer.
1304 struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force,
1307 if (force || atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
1308 struct sk_buff *skb = alloc_skb(size, priority);
1310 skb_set_owner_w(skb, sk);
1316 EXPORT_SYMBOL(sock_wmalloc);
1319 * Allocate a skb from the socket's receive buffer.
1321 struct sk_buff *sock_rmalloc(struct sock *sk, unsigned long size, int force,
1324 if (force || atomic_read(&sk->sk_rmem_alloc) < sk->sk_rcvbuf) {
1325 struct sk_buff *skb = alloc_skb(size, priority);
1327 skb_set_owner_r(skb, sk);
1335 * Allocate a memory block from the socket's option memory buffer.
1337 void *sock_kmalloc(struct sock *sk, int size, gfp_t priority)
1339 if ((unsigned)size <= sysctl_optmem_max &&
1340 atomic_read(&sk->sk_omem_alloc) + size < sysctl_optmem_max) {
1342 /* First do the add, to avoid the race if kmalloc
1345 atomic_add(size, &sk->sk_omem_alloc);
1346 mem = kmalloc(size, priority);
1349 atomic_sub(size, &sk->sk_omem_alloc);
1353 EXPORT_SYMBOL(sock_kmalloc);
1356 * Free an option memory block.
1358 void sock_kfree_s(struct sock *sk, void *mem, int size)
1361 atomic_sub(size, &sk->sk_omem_alloc);
1363 EXPORT_SYMBOL(sock_kfree_s);
1365 /* It is almost wait_for_tcp_memory minus release_sock/lock_sock.
1366 I think, these locks should be removed for datagram sockets.
1368 static long sock_wait_for_wmem(struct sock *sk, long timeo)
1372 clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1376 if (signal_pending(current))
1378 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1379 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
1380 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf)
1382 if (sk->sk_shutdown & SEND_SHUTDOWN)
1386 timeo = schedule_timeout(timeo);
1388 finish_wait(sk->sk_sleep, &wait);
1394 * Generic send/receive buffer handlers
1397 struct sk_buff *sock_alloc_send_pskb(struct sock *sk, unsigned long header_len,
1398 unsigned long data_len, int noblock,
1401 struct sk_buff *skb;
1406 gfp_mask = sk->sk_allocation;
1407 if (gfp_mask & __GFP_WAIT)
1408 gfp_mask |= __GFP_REPEAT;
1410 timeo = sock_sndtimeo(sk, noblock);
1412 err = sock_error(sk);
1417 if (sk->sk_shutdown & SEND_SHUTDOWN)
1420 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
1421 skb = alloc_skb(header_len, gfp_mask);
1426 /* No pages, we're done... */
1430 npages = (data_len + (PAGE_SIZE - 1)) >> PAGE_SHIFT;
1431 skb->truesize += data_len;
1432 skb_shinfo(skb)->nr_frags = npages;
1433 for (i = 0; i < npages; i++) {
1437 page = alloc_pages(sk->sk_allocation, 0);
1440 skb_shinfo(skb)->nr_frags = i;
1445 frag = &skb_shinfo(skb)->frags[i];
1447 frag->page_offset = 0;
1448 frag->size = (data_len >= PAGE_SIZE ?
1451 data_len -= PAGE_SIZE;
1454 /* Full success... */
1460 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1461 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1465 if (signal_pending(current))
1467 timeo = sock_wait_for_wmem(sk, timeo);
1470 skb_set_owner_w(skb, sk);
1474 err = sock_intr_errno(timeo);
1479 EXPORT_SYMBOL(sock_alloc_send_pskb);
1481 struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size,
1482 int noblock, int *errcode)
1484 return sock_alloc_send_pskb(sk, size, 0, noblock, errcode);
1486 EXPORT_SYMBOL(sock_alloc_send_skb);
1488 static void __lock_sock(struct sock *sk)
1493 prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait,
1494 TASK_UNINTERRUPTIBLE);
1495 spin_unlock_bh(&sk->sk_lock.slock);
1497 spin_lock_bh(&sk->sk_lock.slock);
1498 if (!sock_owned_by_user(sk))
1501 finish_wait(&sk->sk_lock.wq, &wait);
1504 static void __release_sock(struct sock *sk)
1506 struct sk_buff *skb = sk->sk_backlog.head;
1509 sk->sk_backlog.head = sk->sk_backlog.tail = NULL;
1513 struct sk_buff *next = skb->next;
1516 sk_backlog_rcv(sk, skb);
1519 * We are in process context here with softirqs
1520 * disabled, use cond_resched_softirq() to preempt.
1521 * This is safe to do because we've taken the backlog
1524 cond_resched_softirq();
1527 } while (skb != NULL);
1530 } while ((skb = sk->sk_backlog.head) != NULL);
1534 * sk_wait_data - wait for data to arrive at sk_receive_queue
1535 * @sk: sock to wait on
1536 * @timeo: for how long
1538 * Now socket state including sk->sk_err is changed only under lock,
1539 * hence we may omit checks after joining wait queue.
1540 * We check receive queue before schedule() only as optimization;
1541 * it is very likely that release_sock() added new data.
1543 int sk_wait_data(struct sock *sk, long *timeo)
1548 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
1549 set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
1550 rc = sk_wait_event(sk, timeo, !skb_queue_empty(&sk->sk_receive_queue));
1551 clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
1552 finish_wait(sk->sk_sleep, &wait);
1555 EXPORT_SYMBOL(sk_wait_data);
1558 * __sk_mem_schedule - increase sk_forward_alloc and memory_allocated
1560 * @size: memory size to allocate
1561 * @kind: allocation type
1563 * If kind is SK_MEM_SEND, it means wmem allocation. Otherwise it means
1564 * rmem allocation. This function assumes that protocols which have
1565 * memory_pressure use sk_wmem_queued as write buffer accounting.
1567 int __sk_mem_schedule(struct sock *sk, int size, int kind)
1569 struct proto *prot = sk->sk_prot;
1570 int amt = sk_mem_pages(size);
1573 sk->sk_forward_alloc += amt * SK_MEM_QUANTUM;
1574 allocated = atomic_add_return(amt, prot->memory_allocated);
1577 if (allocated <= prot->sysctl_mem[0]) {
1578 if (prot->memory_pressure && *prot->memory_pressure)
1579 *prot->memory_pressure = 0;
1583 /* Under pressure. */
1584 if (allocated > prot->sysctl_mem[1])
1585 if (prot->enter_memory_pressure)
1586 prot->enter_memory_pressure(sk);
1588 /* Over hard limit. */
1589 if (allocated > prot->sysctl_mem[2])
1590 goto suppress_allocation;
1592 /* guarantee minimum buffer size under pressure */
1593 if (kind == SK_MEM_RECV) {
1594 if (atomic_read(&sk->sk_rmem_alloc) < prot->sysctl_rmem[0])
1596 } else { /* SK_MEM_SEND */
1597 if (sk->sk_type == SOCK_STREAM) {
1598 if (sk->sk_wmem_queued < prot->sysctl_wmem[0])
1600 } else if (atomic_read(&sk->sk_wmem_alloc) <
1601 prot->sysctl_wmem[0])
1605 if (prot->memory_pressure) {
1608 if (!*prot->memory_pressure)
1610 alloc = percpu_counter_read_positive(prot->sockets_allocated);
1611 if (prot->sysctl_mem[2] > alloc *
1612 sk_mem_pages(sk->sk_wmem_queued +
1613 atomic_read(&sk->sk_rmem_alloc) +
1614 sk->sk_forward_alloc))
1618 suppress_allocation:
1620 if (kind == SK_MEM_SEND && sk->sk_type == SOCK_STREAM) {
1621 sk_stream_moderate_sndbuf(sk);
1623 /* Fail only if socket is _under_ its sndbuf.
1624 * In this case we cannot block, so that we have to fail.
1626 if (sk->sk_wmem_queued + size >= sk->sk_sndbuf)
1630 /* Alas. Undo changes. */
1631 sk->sk_forward_alloc -= amt * SK_MEM_QUANTUM;
1632 atomic_sub(amt, prot->memory_allocated);
1635 EXPORT_SYMBOL(__sk_mem_schedule);
1638 * __sk_reclaim - reclaim memory_allocated
1641 void __sk_mem_reclaim(struct sock *sk)
1643 struct proto *prot = sk->sk_prot;
1645 atomic_sub(sk->sk_forward_alloc >> SK_MEM_QUANTUM_SHIFT,
1646 prot->memory_allocated);
1647 sk->sk_forward_alloc &= SK_MEM_QUANTUM - 1;
1649 if (prot->memory_pressure && *prot->memory_pressure &&
1650 (atomic_read(prot->memory_allocated) < prot->sysctl_mem[0]))
1651 *prot->memory_pressure = 0;
1653 EXPORT_SYMBOL(__sk_mem_reclaim);
1657 * Set of default routines for initialising struct proto_ops when
1658 * the protocol does not support a particular function. In certain
1659 * cases where it makes no sense for a protocol to have a "do nothing"
1660 * function, some default processing is provided.
1663 int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len)
1667 EXPORT_SYMBOL(sock_no_bind);
1669 int sock_no_connect(struct socket *sock, struct sockaddr *saddr,
1674 EXPORT_SYMBOL(sock_no_connect);
1676 int sock_no_socketpair(struct socket *sock1, struct socket *sock2)
1680 EXPORT_SYMBOL(sock_no_socketpair);
1682 int sock_no_accept(struct socket *sock, struct socket *newsock, int flags)
1686 EXPORT_SYMBOL(sock_no_accept);
1688 int sock_no_getname(struct socket *sock, struct sockaddr *saddr,
1693 EXPORT_SYMBOL(sock_no_getname);
1695 unsigned int sock_no_poll(struct file *file, struct socket *sock, poll_table *pt)
1699 EXPORT_SYMBOL(sock_no_poll);
1701 int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1705 EXPORT_SYMBOL(sock_no_ioctl);
1707 int sock_no_listen(struct socket *sock, int backlog)
1711 EXPORT_SYMBOL(sock_no_listen);
1713 int sock_no_shutdown(struct socket *sock, int how)
1717 EXPORT_SYMBOL(sock_no_shutdown);
1719 int sock_no_setsockopt(struct socket *sock, int level, int optname,
1720 char __user *optval, unsigned int optlen)
1724 EXPORT_SYMBOL(sock_no_setsockopt);
1726 int sock_no_getsockopt(struct socket *sock, int level, int optname,
1727 char __user *optval, int __user *optlen)
1731 EXPORT_SYMBOL(sock_no_getsockopt);
1733 int sock_no_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
1738 EXPORT_SYMBOL(sock_no_sendmsg);
1740 int sock_no_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
1741 size_t len, int flags)
1745 EXPORT_SYMBOL(sock_no_recvmsg);
1747 int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma)
1749 /* Mirror missing mmap method error code */
1752 EXPORT_SYMBOL(sock_no_mmap);
1754 ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags)
1757 struct msghdr msg = {.msg_flags = flags};
1759 char *kaddr = kmap(page);
1760 iov.iov_base = kaddr + offset;
1762 res = kernel_sendmsg(sock, &msg, &iov, 1, size);
1766 EXPORT_SYMBOL(sock_no_sendpage);
1769 * Default Socket Callbacks
1772 static void sock_def_wakeup(struct sock *sk)
1774 read_lock(&sk->sk_callback_lock);
1775 if (sk_has_sleeper(sk))
1776 wake_up_interruptible_all(sk->sk_sleep);
1777 read_unlock(&sk->sk_callback_lock);
1780 static void sock_def_error_report(struct sock *sk)
1782 read_lock(&sk->sk_callback_lock);
1783 if (sk_has_sleeper(sk))
1784 wake_up_interruptible_poll(sk->sk_sleep, POLLERR);
1785 sk_wake_async(sk, SOCK_WAKE_IO, POLL_ERR);
1786 read_unlock(&sk->sk_callback_lock);
1789 static void sock_def_readable(struct sock *sk, int len)
1791 read_lock(&sk->sk_callback_lock);
1792 if (sk_has_sleeper(sk))
1793 wake_up_interruptible_sync_poll(sk->sk_sleep, POLLIN |
1794 POLLRDNORM | POLLRDBAND);
1795 sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN);
1796 read_unlock(&sk->sk_callback_lock);
1799 static void sock_def_write_space(struct sock *sk)
1801 read_lock(&sk->sk_callback_lock);
1803 /* Do not wake up a writer until he can make "significant"
1806 if ((atomic_read(&sk->sk_wmem_alloc) << 1) <= sk->sk_sndbuf) {
1807 if (sk_has_sleeper(sk))
1808 wake_up_interruptible_sync_poll(sk->sk_sleep, POLLOUT |
1809 POLLWRNORM | POLLWRBAND);
1811 /* Should agree with poll, otherwise some programs break */
1812 if (sock_writeable(sk))
1813 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
1816 read_unlock(&sk->sk_callback_lock);
1819 static void sock_def_destruct(struct sock *sk)
1821 kfree(sk->sk_protinfo);
1824 void sk_send_sigurg(struct sock *sk)
1826 if (sk->sk_socket && sk->sk_socket->file)
1827 if (send_sigurg(&sk->sk_socket->file->f_owner))
1828 sk_wake_async(sk, SOCK_WAKE_URG, POLL_PRI);
1830 EXPORT_SYMBOL(sk_send_sigurg);
1832 void sk_reset_timer(struct sock *sk, struct timer_list* timer,
1833 unsigned long expires)
1835 if (!mod_timer(timer, expires))
1838 EXPORT_SYMBOL(sk_reset_timer);
1840 void sk_stop_timer(struct sock *sk, struct timer_list* timer)
1842 if (timer_pending(timer) && del_timer(timer))
1845 EXPORT_SYMBOL(sk_stop_timer);
1847 void sock_init_data(struct socket *sock, struct sock *sk)
1849 skb_queue_head_init(&sk->sk_receive_queue);
1850 skb_queue_head_init(&sk->sk_write_queue);
1851 skb_queue_head_init(&sk->sk_error_queue);
1852 #ifdef CONFIG_NET_DMA
1853 skb_queue_head_init(&sk->sk_async_wait_queue);
1856 sk->sk_send_head = NULL;
1858 init_timer(&sk->sk_timer);
1860 sk->sk_allocation = GFP_KERNEL;
1861 sk->sk_rcvbuf = sysctl_rmem_default;
1862 sk->sk_sndbuf = sysctl_wmem_default;
1863 sk->sk_state = TCP_CLOSE;
1864 sk_set_socket(sk, sock);
1866 sock_set_flag(sk, SOCK_ZAPPED);
1869 sk->sk_type = sock->type;
1870 sk->sk_sleep = &sock->wait;
1873 sk->sk_sleep = NULL;
1875 rwlock_init(&sk->sk_dst_lock);
1876 rwlock_init(&sk->sk_callback_lock);
1877 lockdep_set_class_and_name(&sk->sk_callback_lock,
1878 af_callback_keys + sk->sk_family,
1879 af_family_clock_key_strings[sk->sk_family]);
1881 sk->sk_state_change = sock_def_wakeup;
1882 sk->sk_data_ready = sock_def_readable;
1883 sk->sk_write_space = sock_def_write_space;
1884 sk->sk_error_report = sock_def_error_report;
1885 sk->sk_destruct = sock_def_destruct;
1887 sk->sk_sndmsg_page = NULL;
1888 sk->sk_sndmsg_off = 0;
1890 sk->sk_peercred.pid = 0;
1891 sk->sk_peercred.uid = -1;
1892 sk->sk_peercred.gid = -1;
1893 sk->sk_write_pending = 0;
1894 sk->sk_rcvlowat = 1;
1895 sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT;
1896 sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT;
1898 sk->sk_stamp = ktime_set(-1L, 0);
1901 * Before updating sk_refcnt, we must commit prior changes to memory
1902 * (Documentation/RCU/rculist_nulls.txt for details)
1905 atomic_set(&sk->sk_refcnt, 1);
1906 atomic_set(&sk->sk_drops, 0);
1908 EXPORT_SYMBOL(sock_init_data);
1910 void lock_sock_nested(struct sock *sk, int subclass)
1913 spin_lock_bh(&sk->sk_lock.slock);
1914 if (sk->sk_lock.owned)
1916 sk->sk_lock.owned = 1;
1917 spin_unlock(&sk->sk_lock.slock);
1919 * The sk_lock has mutex_lock() semantics here:
1921 mutex_acquire(&sk->sk_lock.dep_map, subclass, 0, _RET_IP_);
1924 EXPORT_SYMBOL(lock_sock_nested);
1926 void release_sock(struct sock *sk)
1929 * The sk_lock has mutex_unlock() semantics:
1931 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_);
1933 spin_lock_bh(&sk->sk_lock.slock);
1934 if (sk->sk_backlog.tail)
1936 sk->sk_lock.owned = 0;
1937 if (waitqueue_active(&sk->sk_lock.wq))
1938 wake_up(&sk->sk_lock.wq);
1939 spin_unlock_bh(&sk->sk_lock.slock);
1941 EXPORT_SYMBOL(release_sock);
1943 int sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp)
1946 if (!sock_flag(sk, SOCK_TIMESTAMP))
1947 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
1948 tv = ktime_to_timeval(sk->sk_stamp);
1949 if (tv.tv_sec == -1)
1951 if (tv.tv_sec == 0) {
1952 sk->sk_stamp = ktime_get_real();
1953 tv = ktime_to_timeval(sk->sk_stamp);
1955 return copy_to_user(userstamp, &tv, sizeof(tv)) ? -EFAULT : 0;
1957 EXPORT_SYMBOL(sock_get_timestamp);
1959 int sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp)
1962 if (!sock_flag(sk, SOCK_TIMESTAMP))
1963 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
1964 ts = ktime_to_timespec(sk->sk_stamp);
1965 if (ts.tv_sec == -1)
1967 if (ts.tv_sec == 0) {
1968 sk->sk_stamp = ktime_get_real();
1969 ts = ktime_to_timespec(sk->sk_stamp);
1971 return copy_to_user(userstamp, &ts, sizeof(ts)) ? -EFAULT : 0;
1973 EXPORT_SYMBOL(sock_get_timestampns);
1975 void sock_enable_timestamp(struct sock *sk, int flag)
1977 if (!sock_flag(sk, flag)) {
1978 sock_set_flag(sk, flag);
1980 * we just set one of the two flags which require net
1981 * time stamping, but time stamping might have been on
1982 * already because of the other one
1985 flag == SOCK_TIMESTAMP ?
1986 SOCK_TIMESTAMPING_RX_SOFTWARE :
1988 net_enable_timestamp();
1993 * Get a socket option on an socket.
1995 * FIX: POSIX 1003.1g is very ambiguous here. It states that
1996 * asynchronous errors should be reported by getsockopt. We assume
1997 * this means if you specify SO_ERROR (otherwise whats the point of it).
1999 int sock_common_getsockopt(struct socket *sock, int level, int optname,
2000 char __user *optval, int __user *optlen)
2002 struct sock *sk = sock->sk;
2004 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
2006 EXPORT_SYMBOL(sock_common_getsockopt);
2008 #ifdef CONFIG_COMPAT
2009 int compat_sock_common_getsockopt(struct socket *sock, int level, int optname,
2010 char __user *optval, int __user *optlen)
2012 struct sock *sk = sock->sk;
2014 if (sk->sk_prot->compat_getsockopt != NULL)
2015 return sk->sk_prot->compat_getsockopt(sk, level, optname,
2017 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
2019 EXPORT_SYMBOL(compat_sock_common_getsockopt);
2022 int sock_common_recvmsg(struct kiocb *iocb, struct socket *sock,
2023 struct msghdr *msg, size_t size, int flags)
2025 struct sock *sk = sock->sk;
2029 err = sk->sk_prot->recvmsg(iocb, sk, msg, size, flags & MSG_DONTWAIT,
2030 flags & ~MSG_DONTWAIT, &addr_len);
2032 msg->msg_namelen = addr_len;
2035 EXPORT_SYMBOL(sock_common_recvmsg);
2038 * Set socket options on an inet socket.
2040 int sock_common_setsockopt(struct socket *sock, int level, int optname,
2041 char __user *optval, unsigned int optlen)
2043 struct sock *sk = sock->sk;
2045 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
2047 EXPORT_SYMBOL(sock_common_setsockopt);
2049 #ifdef CONFIG_COMPAT
2050 int compat_sock_common_setsockopt(struct socket *sock, int level, int optname,
2051 char __user *optval, unsigned int optlen)
2053 struct sock *sk = sock->sk;
2055 if (sk->sk_prot->compat_setsockopt != NULL)
2056 return sk->sk_prot->compat_setsockopt(sk, level, optname,
2058 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
2060 EXPORT_SYMBOL(compat_sock_common_setsockopt);
2063 void sk_common_release(struct sock *sk)
2065 if (sk->sk_prot->destroy)
2066 sk->sk_prot->destroy(sk);
2069 * Observation: when sock_common_release is called, processes have
2070 * no access to socket. But net still has.
2071 * Step one, detach it from networking:
2073 * A. Remove from hash tables.
2076 sk->sk_prot->unhash(sk);
2079 * In this point socket cannot receive new packets, but it is possible
2080 * that some packets are in flight because some CPU runs receiver and
2081 * did hash table lookup before we unhashed socket. They will achieve
2082 * receive queue and will be purged by socket destructor.
2084 * Also we still have packets pending on receive queue and probably,
2085 * our own packets waiting in device queues. sock_destroy will drain
2086 * receive queue, but transmitted packets will delay socket destruction
2087 * until the last reference will be released.
2092 xfrm_sk_free_policy(sk);
2094 sk_refcnt_debug_release(sk);
2097 EXPORT_SYMBOL(sk_common_release);
2099 static DEFINE_RWLOCK(proto_list_lock);
2100 static LIST_HEAD(proto_list);
2102 #ifdef CONFIG_PROC_FS
2103 #define PROTO_INUSE_NR 64 /* should be enough for the first time */
2105 int val[PROTO_INUSE_NR];
2108 static DECLARE_BITMAP(proto_inuse_idx, PROTO_INUSE_NR);
2110 #ifdef CONFIG_NET_NS
2111 void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
2113 int cpu = smp_processor_id();
2114 per_cpu_ptr(net->core.inuse, cpu)->val[prot->inuse_idx] += val;
2116 EXPORT_SYMBOL_GPL(sock_prot_inuse_add);
2118 int sock_prot_inuse_get(struct net *net, struct proto *prot)
2120 int cpu, idx = prot->inuse_idx;
2123 for_each_possible_cpu(cpu)
2124 res += per_cpu_ptr(net->core.inuse, cpu)->val[idx];
2126 return res >= 0 ? res : 0;
2128 EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
2130 static int sock_inuse_init_net(struct net *net)
2132 net->core.inuse = alloc_percpu(struct prot_inuse);
2133 return net->core.inuse ? 0 : -ENOMEM;
2136 static void sock_inuse_exit_net(struct net *net)
2138 free_percpu(net->core.inuse);
2141 static struct pernet_operations net_inuse_ops = {
2142 .init = sock_inuse_init_net,
2143 .exit = sock_inuse_exit_net,
2146 static __init int net_inuse_init(void)
2148 if (register_pernet_subsys(&net_inuse_ops))
2149 panic("Cannot initialize net inuse counters");
2154 core_initcall(net_inuse_init);
2156 static DEFINE_PER_CPU(struct prot_inuse, prot_inuse);
2158 void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
2160 __get_cpu_var(prot_inuse).val[prot->inuse_idx] += val;
2162 EXPORT_SYMBOL_GPL(sock_prot_inuse_add);
2164 int sock_prot_inuse_get(struct net *net, struct proto *prot)
2166 int cpu, idx = prot->inuse_idx;
2169 for_each_possible_cpu(cpu)
2170 res += per_cpu(prot_inuse, cpu).val[idx];
2172 return res >= 0 ? res : 0;
2174 EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
2177 static void assign_proto_idx(struct proto *prot)
2179 prot->inuse_idx = find_first_zero_bit(proto_inuse_idx, PROTO_INUSE_NR);
2181 if (unlikely(prot->inuse_idx == PROTO_INUSE_NR - 1)) {
2182 printk(KERN_ERR "PROTO_INUSE_NR exhausted\n");
2186 set_bit(prot->inuse_idx, proto_inuse_idx);
2189 static void release_proto_idx(struct proto *prot)
2191 if (prot->inuse_idx != PROTO_INUSE_NR - 1)
2192 clear_bit(prot->inuse_idx, proto_inuse_idx);
2195 static inline void assign_proto_idx(struct proto *prot)
2199 static inline void release_proto_idx(struct proto *prot)
2204 int proto_register(struct proto *prot, int alloc_slab)
2207 prot->slab = kmem_cache_create(prot->name, prot->obj_size, 0,
2208 SLAB_HWCACHE_ALIGN | prot->slab_flags,
2211 if (prot->slab == NULL) {
2212 printk(KERN_CRIT "%s: Can't create sock SLAB cache!\n",
2217 if (prot->rsk_prot != NULL) {
2218 static const char mask[] = "request_sock_%s";
2220 prot->rsk_prot->slab_name = kmalloc(strlen(prot->name) + sizeof(mask) - 1, GFP_KERNEL);
2221 if (prot->rsk_prot->slab_name == NULL)
2222 goto out_free_sock_slab;
2224 sprintf(prot->rsk_prot->slab_name, mask, prot->name);
2225 prot->rsk_prot->slab = kmem_cache_create(prot->rsk_prot->slab_name,
2226 prot->rsk_prot->obj_size, 0,
2227 SLAB_HWCACHE_ALIGN, NULL);
2229 if (prot->rsk_prot->slab == NULL) {
2230 printk(KERN_CRIT "%s: Can't create request sock SLAB cache!\n",
2232 goto out_free_request_sock_slab_name;
2236 if (prot->twsk_prot != NULL) {
2237 static const char mask[] = "tw_sock_%s";
2239 prot->twsk_prot->twsk_slab_name = kmalloc(strlen(prot->name) + sizeof(mask) - 1, GFP_KERNEL);
2241 if (prot->twsk_prot->twsk_slab_name == NULL)
2242 goto out_free_request_sock_slab;
2244 sprintf(prot->twsk_prot->twsk_slab_name, mask, prot->name);
2245 prot->twsk_prot->twsk_slab =
2246 kmem_cache_create(prot->twsk_prot->twsk_slab_name,
2247 prot->twsk_prot->twsk_obj_size,
2249 SLAB_HWCACHE_ALIGN |
2252 if (prot->twsk_prot->twsk_slab == NULL)
2253 goto out_free_timewait_sock_slab_name;
2257 write_lock(&proto_list_lock);
2258 list_add(&prot->node, &proto_list);
2259 assign_proto_idx(prot);
2260 write_unlock(&proto_list_lock);
2263 out_free_timewait_sock_slab_name:
2264 kfree(prot->twsk_prot->twsk_slab_name);
2265 out_free_request_sock_slab:
2266 if (prot->rsk_prot && prot->rsk_prot->slab) {
2267 kmem_cache_destroy(prot->rsk_prot->slab);
2268 prot->rsk_prot->slab = NULL;
2270 out_free_request_sock_slab_name:
2271 kfree(prot->rsk_prot->slab_name);
2273 kmem_cache_destroy(prot->slab);
2278 EXPORT_SYMBOL(proto_register);
2280 void proto_unregister(struct proto *prot)
2282 write_lock(&proto_list_lock);
2283 release_proto_idx(prot);
2284 list_del(&prot->node);
2285 write_unlock(&proto_list_lock);
2287 if (prot->slab != NULL) {
2288 kmem_cache_destroy(prot->slab);
2292 if (prot->rsk_prot != NULL && prot->rsk_prot->slab != NULL) {
2293 kmem_cache_destroy(prot->rsk_prot->slab);
2294 kfree(prot->rsk_prot->slab_name);
2295 prot->rsk_prot->slab = NULL;
2298 if (prot->twsk_prot != NULL && prot->twsk_prot->twsk_slab != NULL) {
2299 kmem_cache_destroy(prot->twsk_prot->twsk_slab);
2300 kfree(prot->twsk_prot->twsk_slab_name);
2301 prot->twsk_prot->twsk_slab = NULL;
2304 EXPORT_SYMBOL(proto_unregister);
2306 #ifdef CONFIG_PROC_FS
2307 static void *proto_seq_start(struct seq_file *seq, loff_t *pos)
2308 __acquires(proto_list_lock)
2310 read_lock(&proto_list_lock);
2311 return seq_list_start_head(&proto_list, *pos);
2314 static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2316 return seq_list_next(v, &proto_list, pos);
2319 static void proto_seq_stop(struct seq_file *seq, void *v)
2320 __releases(proto_list_lock)
2322 read_unlock(&proto_list_lock);
2325 static char proto_method_implemented(const void *method)
2327 return method == NULL ? 'n' : 'y';
2330 static void proto_seq_printf(struct seq_file *seq, struct proto *proto)
2332 seq_printf(seq, "%-9s %4u %6d %6d %-3s %6u %-3s %-10s "
2333 "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n",
2336 sock_prot_inuse_get(seq_file_net(seq), proto),
2337 proto->memory_allocated != NULL ? atomic_read(proto->memory_allocated) : -1,
2338 proto->memory_pressure != NULL ? *proto->memory_pressure ? "yes" : "no" : "NI",
2340 proto->slab == NULL ? "no" : "yes",
2341 module_name(proto->owner),
2342 proto_method_implemented(proto->close),
2343 proto_method_implemented(proto->connect),
2344 proto_method_implemented(proto->disconnect),
2345 proto_method_implemented(proto->accept),
2346 proto_method_implemented(proto->ioctl),
2347 proto_method_implemented(proto->init),
2348 proto_method_implemented(proto->destroy),
2349 proto_method_implemented(proto->shutdown),
2350 proto_method_implemented(proto->setsockopt),
2351 proto_method_implemented(proto->getsockopt),
2352 proto_method_implemented(proto->sendmsg),
2353 proto_method_implemented(proto->recvmsg),
2354 proto_method_implemented(proto->sendpage),
2355 proto_method_implemented(proto->bind),
2356 proto_method_implemented(proto->backlog_rcv),
2357 proto_method_implemented(proto->hash),
2358 proto_method_implemented(proto->unhash),
2359 proto_method_implemented(proto->get_port),
2360 proto_method_implemented(proto->enter_memory_pressure));
2363 static int proto_seq_show(struct seq_file *seq, void *v)
2365 if (v == &proto_list)
2366 seq_printf(seq, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s",
2375 "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n");
2377 proto_seq_printf(seq, list_entry(v, struct proto, node));
2381 static const struct seq_operations proto_seq_ops = {
2382 .start = proto_seq_start,
2383 .next = proto_seq_next,
2384 .stop = proto_seq_stop,
2385 .show = proto_seq_show,
2388 static int proto_seq_open(struct inode *inode, struct file *file)
2390 return seq_open_net(inode, file, &proto_seq_ops,
2391 sizeof(struct seq_net_private));
2394 static const struct file_operations proto_seq_fops = {
2395 .owner = THIS_MODULE,
2396 .open = proto_seq_open,
2398 .llseek = seq_lseek,
2399 .release = seq_release_net,
2402 static __net_init int proto_init_net(struct net *net)
2404 if (!proc_net_fops_create(net, "protocols", S_IRUGO, &proto_seq_fops))
2410 static __net_exit void proto_exit_net(struct net *net)
2412 proc_net_remove(net, "protocols");
2416 static __net_initdata struct pernet_operations proto_net_ops = {
2417 .init = proto_init_net,
2418 .exit = proto_exit_net,
2421 static int __init proto_init(void)
2423 return register_pernet_subsys(&proto_net_ops);
2426 subsys_initcall(proto_init);
2428 #endif /* PROC_FS */