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>
113 #include <linux/user_namespace.h>
114 #include <linux/static_key.h>
115 #include <linux/memcontrol.h>
117 #include <asm/uaccess.h>
118 #include <asm/system.h>
120 #include <linux/netdevice.h>
121 #include <net/protocol.h>
122 #include <linux/skbuff.h>
123 #include <net/net_namespace.h>
124 #include <net/request_sock.h>
125 #include <net/sock.h>
126 #include <linux/net_tstamp.h>
127 #include <net/xfrm.h>
128 #include <linux/ipsec.h>
129 #include <net/cls_cgroup.h>
130 #include <net/netprio_cgroup.h>
132 #include <linux/filter.h>
134 #include <trace/events/sock.h>
140 static DEFINE_MUTEX(proto_list_mutex);
141 static LIST_HEAD(proto_list);
143 #ifdef CONFIG_CGROUP_MEM_RES_CTLR_KMEM
144 int mem_cgroup_sockets_init(struct cgroup *cgrp, struct cgroup_subsys *ss)
149 mutex_lock(&proto_list_mutex);
150 list_for_each_entry(proto, &proto_list, node) {
151 if (proto->init_cgroup) {
152 ret = proto->init_cgroup(cgrp, ss);
158 mutex_unlock(&proto_list_mutex);
161 list_for_each_entry_continue_reverse(proto, &proto_list, node)
162 if (proto->destroy_cgroup)
163 proto->destroy_cgroup(cgrp);
164 mutex_unlock(&proto_list_mutex);
168 void mem_cgroup_sockets_destroy(struct cgroup *cgrp)
172 mutex_lock(&proto_list_mutex);
173 list_for_each_entry_reverse(proto, &proto_list, node)
174 if (proto->destroy_cgroup)
175 proto->destroy_cgroup(cgrp);
176 mutex_unlock(&proto_list_mutex);
181 * Each address family might have different locking rules, so we have
182 * one slock key per address family:
184 static struct lock_class_key af_family_keys[AF_MAX];
185 static struct lock_class_key af_family_slock_keys[AF_MAX];
187 struct static_key memcg_socket_limit_enabled;
188 EXPORT_SYMBOL(memcg_socket_limit_enabled);
191 * Make lock validator output more readable. (we pre-construct these
192 * strings build-time, so that runtime initialization of socket
195 static const char *const af_family_key_strings[AF_MAX+1] = {
196 "sk_lock-AF_UNSPEC", "sk_lock-AF_UNIX" , "sk_lock-AF_INET" ,
197 "sk_lock-AF_AX25" , "sk_lock-AF_IPX" , "sk_lock-AF_APPLETALK",
198 "sk_lock-AF_NETROM", "sk_lock-AF_BRIDGE" , "sk_lock-AF_ATMPVC" ,
199 "sk_lock-AF_X25" , "sk_lock-AF_INET6" , "sk_lock-AF_ROSE" ,
200 "sk_lock-AF_DECnet", "sk_lock-AF_NETBEUI" , "sk_lock-AF_SECURITY" ,
201 "sk_lock-AF_KEY" , "sk_lock-AF_NETLINK" , "sk_lock-AF_PACKET" ,
202 "sk_lock-AF_ASH" , "sk_lock-AF_ECONET" , "sk_lock-AF_ATMSVC" ,
203 "sk_lock-AF_RDS" , "sk_lock-AF_SNA" , "sk_lock-AF_IRDA" ,
204 "sk_lock-AF_PPPOX" , "sk_lock-AF_WANPIPE" , "sk_lock-AF_LLC" ,
205 "sk_lock-27" , "sk_lock-28" , "sk_lock-AF_CAN" ,
206 "sk_lock-AF_TIPC" , "sk_lock-AF_BLUETOOTH", "sk_lock-IUCV" ,
207 "sk_lock-AF_RXRPC" , "sk_lock-AF_ISDN" , "sk_lock-AF_PHONET" ,
208 "sk_lock-AF_IEEE802154", "sk_lock-AF_CAIF" , "sk_lock-AF_ALG" ,
209 "sk_lock-AF_NFC" , "sk_lock-AF_MAX"
211 static const char *const af_family_slock_key_strings[AF_MAX+1] = {
212 "slock-AF_UNSPEC", "slock-AF_UNIX" , "slock-AF_INET" ,
213 "slock-AF_AX25" , "slock-AF_IPX" , "slock-AF_APPLETALK",
214 "slock-AF_NETROM", "slock-AF_BRIDGE" , "slock-AF_ATMPVC" ,
215 "slock-AF_X25" , "slock-AF_INET6" , "slock-AF_ROSE" ,
216 "slock-AF_DECnet", "slock-AF_NETBEUI" , "slock-AF_SECURITY" ,
217 "slock-AF_KEY" , "slock-AF_NETLINK" , "slock-AF_PACKET" ,
218 "slock-AF_ASH" , "slock-AF_ECONET" , "slock-AF_ATMSVC" ,
219 "slock-AF_RDS" , "slock-AF_SNA" , "slock-AF_IRDA" ,
220 "slock-AF_PPPOX" , "slock-AF_WANPIPE" , "slock-AF_LLC" ,
221 "slock-27" , "slock-28" , "slock-AF_CAN" ,
222 "slock-AF_TIPC" , "slock-AF_BLUETOOTH", "slock-AF_IUCV" ,
223 "slock-AF_RXRPC" , "slock-AF_ISDN" , "slock-AF_PHONET" ,
224 "slock-AF_IEEE802154", "slock-AF_CAIF" , "slock-AF_ALG" ,
225 "slock-AF_NFC" , "slock-AF_MAX"
227 static const char *const af_family_clock_key_strings[AF_MAX+1] = {
228 "clock-AF_UNSPEC", "clock-AF_UNIX" , "clock-AF_INET" ,
229 "clock-AF_AX25" , "clock-AF_IPX" , "clock-AF_APPLETALK",
230 "clock-AF_NETROM", "clock-AF_BRIDGE" , "clock-AF_ATMPVC" ,
231 "clock-AF_X25" , "clock-AF_INET6" , "clock-AF_ROSE" ,
232 "clock-AF_DECnet", "clock-AF_NETBEUI" , "clock-AF_SECURITY" ,
233 "clock-AF_KEY" , "clock-AF_NETLINK" , "clock-AF_PACKET" ,
234 "clock-AF_ASH" , "clock-AF_ECONET" , "clock-AF_ATMSVC" ,
235 "clock-AF_RDS" , "clock-AF_SNA" , "clock-AF_IRDA" ,
236 "clock-AF_PPPOX" , "clock-AF_WANPIPE" , "clock-AF_LLC" ,
237 "clock-27" , "clock-28" , "clock-AF_CAN" ,
238 "clock-AF_TIPC" , "clock-AF_BLUETOOTH", "clock-AF_IUCV" ,
239 "clock-AF_RXRPC" , "clock-AF_ISDN" , "clock-AF_PHONET" ,
240 "clock-AF_IEEE802154", "clock-AF_CAIF" , "clock-AF_ALG" ,
241 "clock-AF_NFC" , "clock-AF_MAX"
245 * sk_callback_lock locking rules are per-address-family,
246 * so split the lock classes by using a per-AF key:
248 static struct lock_class_key af_callback_keys[AF_MAX];
250 /* Take into consideration the size of the struct sk_buff overhead in the
251 * determination of these values, since that is non-constant across
252 * platforms. This makes socket queueing behavior and performance
253 * not depend upon such differences.
255 #define _SK_MEM_PACKETS 256
256 #define _SK_MEM_OVERHEAD SKB_TRUESIZE(256)
257 #define SK_WMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS)
258 #define SK_RMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS)
260 /* Run time adjustable parameters. */
261 __u32 sysctl_wmem_max __read_mostly = SK_WMEM_MAX;
262 __u32 sysctl_rmem_max __read_mostly = SK_RMEM_MAX;
263 __u32 sysctl_wmem_default __read_mostly = SK_WMEM_MAX;
264 __u32 sysctl_rmem_default __read_mostly = SK_RMEM_MAX;
266 /* Maximal space eaten by iovec or ancillary data plus some space */
267 int sysctl_optmem_max __read_mostly = sizeof(unsigned long)*(2*UIO_MAXIOV+512);
268 EXPORT_SYMBOL(sysctl_optmem_max);
270 #if defined(CONFIG_CGROUPS)
271 #if !defined(CONFIG_NET_CLS_CGROUP)
272 int net_cls_subsys_id = -1;
273 EXPORT_SYMBOL_GPL(net_cls_subsys_id);
275 #if !defined(CONFIG_NETPRIO_CGROUP)
276 int net_prio_subsys_id = -1;
277 EXPORT_SYMBOL_GPL(net_prio_subsys_id);
281 static int sock_set_timeout(long *timeo_p, char __user *optval, int optlen)
285 if (optlen < sizeof(tv))
287 if (copy_from_user(&tv, optval, sizeof(tv)))
289 if (tv.tv_usec < 0 || tv.tv_usec >= USEC_PER_SEC)
293 static int warned __read_mostly;
296 if (warned < 10 && net_ratelimit()) {
298 printk(KERN_INFO "sock_set_timeout: `%s' (pid %d) "
299 "tries to set negative timeout\n",
300 current->comm, task_pid_nr(current));
304 *timeo_p = MAX_SCHEDULE_TIMEOUT;
305 if (tv.tv_sec == 0 && tv.tv_usec == 0)
307 if (tv.tv_sec < (MAX_SCHEDULE_TIMEOUT/HZ - 1))
308 *timeo_p = tv.tv_sec*HZ + (tv.tv_usec+(1000000/HZ-1))/(1000000/HZ);
312 static void sock_warn_obsolete_bsdism(const char *name)
315 static char warncomm[TASK_COMM_LEN];
316 if (strcmp(warncomm, current->comm) && warned < 5) {
317 strcpy(warncomm, current->comm);
318 printk(KERN_WARNING "process `%s' is using obsolete "
319 "%s SO_BSDCOMPAT\n", warncomm, name);
324 #define SK_FLAGS_TIMESTAMP ((1UL << SOCK_TIMESTAMP) | (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE))
326 static void sock_disable_timestamp(struct sock *sk, unsigned long flags)
328 if (sk->sk_flags & flags) {
329 sk->sk_flags &= ~flags;
330 if (!(sk->sk_flags & SK_FLAGS_TIMESTAMP))
331 net_disable_timestamp();
336 int sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
341 struct sk_buff_head *list = &sk->sk_receive_queue;
343 if (atomic_read(&sk->sk_rmem_alloc) >= sk->sk_rcvbuf) {
344 atomic_inc(&sk->sk_drops);
345 trace_sock_rcvqueue_full(sk, skb);
349 err = sk_filter(sk, skb);
353 if (!sk_rmem_schedule(sk, skb->truesize)) {
354 atomic_inc(&sk->sk_drops);
359 skb_set_owner_r(skb, sk);
361 /* Cache the SKB length before we tack it onto the receive
362 * queue. Once it is added it no longer belongs to us and
363 * may be freed by other threads of control pulling packets
368 /* we escape from rcu protected region, make sure we dont leak
373 spin_lock_irqsave(&list->lock, flags);
374 skb->dropcount = atomic_read(&sk->sk_drops);
375 __skb_queue_tail(list, skb);
376 spin_unlock_irqrestore(&list->lock, flags);
378 if (!sock_flag(sk, SOCK_DEAD))
379 sk->sk_data_ready(sk, skb_len);
382 EXPORT_SYMBOL(sock_queue_rcv_skb);
384 int sk_receive_skb(struct sock *sk, struct sk_buff *skb, const int nested)
386 int rc = NET_RX_SUCCESS;
388 if (sk_filter(sk, skb))
389 goto discard_and_relse;
393 if (sk_rcvqueues_full(sk, skb)) {
394 atomic_inc(&sk->sk_drops);
395 goto discard_and_relse;
398 bh_lock_sock_nested(sk);
401 if (!sock_owned_by_user(sk)) {
403 * trylock + unlock semantics:
405 mutex_acquire(&sk->sk_lock.dep_map, 0, 1, _RET_IP_);
407 rc = sk_backlog_rcv(sk, skb);
409 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_);
410 } else if (sk_add_backlog(sk, skb)) {
412 atomic_inc(&sk->sk_drops);
413 goto discard_and_relse;
424 EXPORT_SYMBOL(sk_receive_skb);
426 void sk_reset_txq(struct sock *sk)
428 sk_tx_queue_clear(sk);
430 EXPORT_SYMBOL(sk_reset_txq);
432 struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie)
434 struct dst_entry *dst = __sk_dst_get(sk);
436 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
437 sk_tx_queue_clear(sk);
438 RCU_INIT_POINTER(sk->sk_dst_cache, NULL);
445 EXPORT_SYMBOL(__sk_dst_check);
447 struct dst_entry *sk_dst_check(struct sock *sk, u32 cookie)
449 struct dst_entry *dst = sk_dst_get(sk);
451 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
459 EXPORT_SYMBOL(sk_dst_check);
461 static int sock_bindtodevice(struct sock *sk, char __user *optval, int optlen)
463 int ret = -ENOPROTOOPT;
464 #ifdef CONFIG_NETDEVICES
465 struct net *net = sock_net(sk);
466 char devname[IFNAMSIZ];
471 if (!capable(CAP_NET_RAW))
478 /* Bind this socket to a particular device like "eth0",
479 * as specified in the passed interface name. If the
480 * name is "" or the option length is zero the socket
483 if (optlen > IFNAMSIZ - 1)
484 optlen = IFNAMSIZ - 1;
485 memset(devname, 0, sizeof(devname));
488 if (copy_from_user(devname, optval, optlen))
492 if (devname[0] != '\0') {
493 struct net_device *dev;
496 dev = dev_get_by_name_rcu(net, devname);
498 index = dev->ifindex;
506 sk->sk_bound_dev_if = index;
518 static inline void sock_valbool_flag(struct sock *sk, int bit, int valbool)
521 sock_set_flag(sk, bit);
523 sock_reset_flag(sk, bit);
527 * This is meant for all protocols to use and covers goings on
528 * at the socket level. Everything here is generic.
531 int sock_setsockopt(struct socket *sock, int level, int optname,
532 char __user *optval, unsigned int optlen)
534 struct sock *sk = sock->sk;
541 * Options without arguments
544 if (optname == SO_BINDTODEVICE)
545 return sock_bindtodevice(sk, optval, optlen);
547 if (optlen < sizeof(int))
550 if (get_user(val, (int __user *)optval))
553 valbool = val ? 1 : 0;
559 if (val && !capable(CAP_NET_ADMIN))
562 sock_valbool_flag(sk, SOCK_DBG, valbool);
565 sk->sk_reuse = valbool;
574 sock_valbool_flag(sk, SOCK_LOCALROUTE, valbool);
577 sock_valbool_flag(sk, SOCK_BROADCAST, valbool);
580 /* Don't error on this BSD doesn't and if you think
581 about it this is right. Otherwise apps have to
582 play 'guess the biggest size' games. RCVBUF/SNDBUF
583 are treated in BSD as hints */
585 if (val > sysctl_wmem_max)
586 val = sysctl_wmem_max;
588 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
589 if ((val * 2) < SOCK_MIN_SNDBUF)
590 sk->sk_sndbuf = SOCK_MIN_SNDBUF;
592 sk->sk_sndbuf = val * 2;
595 * Wake up sending tasks if we
598 sk->sk_write_space(sk);
602 if (!capable(CAP_NET_ADMIN)) {
609 /* Don't error on this BSD doesn't and if you think
610 about it this is right. Otherwise apps have to
611 play 'guess the biggest size' games. RCVBUF/SNDBUF
612 are treated in BSD as hints */
614 if (val > sysctl_rmem_max)
615 val = sysctl_rmem_max;
617 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
619 * We double it on the way in to account for
620 * "struct sk_buff" etc. overhead. Applications
621 * assume that the SO_RCVBUF setting they make will
622 * allow that much actual data to be received on that
625 * Applications are unaware that "struct sk_buff" and
626 * other overheads allocate from the receive buffer
627 * during socket buffer allocation.
629 * And after considering the possible alternatives,
630 * returning the value we actually used in getsockopt
631 * is the most desirable behavior.
633 if ((val * 2) < SOCK_MIN_RCVBUF)
634 sk->sk_rcvbuf = SOCK_MIN_RCVBUF;
636 sk->sk_rcvbuf = val * 2;
640 if (!capable(CAP_NET_ADMIN)) {
648 if (sk->sk_protocol == IPPROTO_TCP)
649 tcp_set_keepalive(sk, valbool);
651 sock_valbool_flag(sk, SOCK_KEEPOPEN, valbool);
655 sock_valbool_flag(sk, SOCK_URGINLINE, valbool);
659 sk->sk_no_check = valbool;
663 if ((val >= 0 && val <= 6) || capable(CAP_NET_ADMIN))
664 sk->sk_priority = val;
670 if (optlen < sizeof(ling)) {
671 ret = -EINVAL; /* 1003.1g */
674 if (copy_from_user(&ling, optval, sizeof(ling))) {
679 sock_reset_flag(sk, SOCK_LINGER);
681 #if (BITS_PER_LONG == 32)
682 if ((unsigned int)ling.l_linger >= MAX_SCHEDULE_TIMEOUT/HZ)
683 sk->sk_lingertime = MAX_SCHEDULE_TIMEOUT;
686 sk->sk_lingertime = (unsigned int)ling.l_linger * HZ;
687 sock_set_flag(sk, SOCK_LINGER);
692 sock_warn_obsolete_bsdism("setsockopt");
697 set_bit(SOCK_PASSCRED, &sock->flags);
699 clear_bit(SOCK_PASSCRED, &sock->flags);
705 if (optname == SO_TIMESTAMP)
706 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
708 sock_set_flag(sk, SOCK_RCVTSTAMPNS);
709 sock_set_flag(sk, SOCK_RCVTSTAMP);
710 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
712 sock_reset_flag(sk, SOCK_RCVTSTAMP);
713 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
717 case SO_TIMESTAMPING:
718 if (val & ~SOF_TIMESTAMPING_MASK) {
722 sock_valbool_flag(sk, SOCK_TIMESTAMPING_TX_HARDWARE,
723 val & SOF_TIMESTAMPING_TX_HARDWARE);
724 sock_valbool_flag(sk, SOCK_TIMESTAMPING_TX_SOFTWARE,
725 val & SOF_TIMESTAMPING_TX_SOFTWARE);
726 sock_valbool_flag(sk, SOCK_TIMESTAMPING_RX_HARDWARE,
727 val & SOF_TIMESTAMPING_RX_HARDWARE);
728 if (val & SOF_TIMESTAMPING_RX_SOFTWARE)
729 sock_enable_timestamp(sk,
730 SOCK_TIMESTAMPING_RX_SOFTWARE);
732 sock_disable_timestamp(sk,
733 (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE));
734 sock_valbool_flag(sk, SOCK_TIMESTAMPING_SOFTWARE,
735 val & SOF_TIMESTAMPING_SOFTWARE);
736 sock_valbool_flag(sk, SOCK_TIMESTAMPING_SYS_HARDWARE,
737 val & SOF_TIMESTAMPING_SYS_HARDWARE);
738 sock_valbool_flag(sk, SOCK_TIMESTAMPING_RAW_HARDWARE,
739 val & SOF_TIMESTAMPING_RAW_HARDWARE);
745 sk->sk_rcvlowat = val ? : 1;
749 ret = sock_set_timeout(&sk->sk_rcvtimeo, optval, optlen);
753 ret = sock_set_timeout(&sk->sk_sndtimeo, optval, optlen);
756 case SO_ATTACH_FILTER:
758 if (optlen == sizeof(struct sock_fprog)) {
759 struct sock_fprog fprog;
762 if (copy_from_user(&fprog, optval, sizeof(fprog)))
765 ret = sk_attach_filter(&fprog, sk);
769 case SO_DETACH_FILTER:
770 ret = sk_detach_filter(sk);
775 set_bit(SOCK_PASSSEC, &sock->flags);
777 clear_bit(SOCK_PASSSEC, &sock->flags);
780 if (!capable(CAP_NET_ADMIN))
786 /* We implement the SO_SNDLOWAT etc to
787 not be settable (1003.1g 5.3) */
789 sock_valbool_flag(sk, SOCK_RXQ_OVFL, valbool);
793 sock_valbool_flag(sk, SOCK_WIFI_STATUS, valbool);
797 if (sock->ops->set_peek_off)
798 sock->ops->set_peek_off(sk, val);
804 sock_valbool_flag(sk, SOCK_NOFCS, valbool);
814 EXPORT_SYMBOL(sock_setsockopt);
817 void cred_to_ucred(struct pid *pid, const struct cred *cred,
820 ucred->pid = pid_vnr(pid);
821 ucred->uid = ucred->gid = -1;
823 struct user_namespace *current_ns = current_user_ns();
825 ucred->uid = user_ns_map_uid(current_ns, cred, cred->euid);
826 ucred->gid = user_ns_map_gid(current_ns, cred, cred->egid);
829 EXPORT_SYMBOL_GPL(cred_to_ucred);
831 int sock_getsockopt(struct socket *sock, int level, int optname,
832 char __user *optval, int __user *optlen)
834 struct sock *sk = sock->sk;
842 int lv = sizeof(int);
845 if (get_user(len, optlen))
850 memset(&v, 0, sizeof(v));
854 v.val = sock_flag(sk, SOCK_DBG);
858 v.val = sock_flag(sk, SOCK_LOCALROUTE);
862 v.val = !!sock_flag(sk, SOCK_BROADCAST);
866 v.val = sk->sk_sndbuf;
870 v.val = sk->sk_rcvbuf;
874 v.val = sk->sk_reuse;
878 v.val = !!sock_flag(sk, SOCK_KEEPOPEN);
886 v.val = sk->sk_protocol;
890 v.val = sk->sk_family;
894 v.val = -sock_error(sk);
896 v.val = xchg(&sk->sk_err_soft, 0);
900 v.val = !!sock_flag(sk, SOCK_URGINLINE);
904 v.val = sk->sk_no_check;
908 v.val = sk->sk_priority;
913 v.ling.l_onoff = !!sock_flag(sk, SOCK_LINGER);
914 v.ling.l_linger = sk->sk_lingertime / HZ;
918 sock_warn_obsolete_bsdism("getsockopt");
922 v.val = sock_flag(sk, SOCK_RCVTSTAMP) &&
923 !sock_flag(sk, SOCK_RCVTSTAMPNS);
927 v.val = sock_flag(sk, SOCK_RCVTSTAMPNS);
930 case SO_TIMESTAMPING:
932 if (sock_flag(sk, SOCK_TIMESTAMPING_TX_HARDWARE))
933 v.val |= SOF_TIMESTAMPING_TX_HARDWARE;
934 if (sock_flag(sk, SOCK_TIMESTAMPING_TX_SOFTWARE))
935 v.val |= SOF_TIMESTAMPING_TX_SOFTWARE;
936 if (sock_flag(sk, SOCK_TIMESTAMPING_RX_HARDWARE))
937 v.val |= SOF_TIMESTAMPING_RX_HARDWARE;
938 if (sock_flag(sk, SOCK_TIMESTAMPING_RX_SOFTWARE))
939 v.val |= SOF_TIMESTAMPING_RX_SOFTWARE;
940 if (sock_flag(sk, SOCK_TIMESTAMPING_SOFTWARE))
941 v.val |= SOF_TIMESTAMPING_SOFTWARE;
942 if (sock_flag(sk, SOCK_TIMESTAMPING_SYS_HARDWARE))
943 v.val |= SOF_TIMESTAMPING_SYS_HARDWARE;
944 if (sock_flag(sk, SOCK_TIMESTAMPING_RAW_HARDWARE))
945 v.val |= SOF_TIMESTAMPING_RAW_HARDWARE;
949 lv = sizeof(struct timeval);
950 if (sk->sk_rcvtimeo == MAX_SCHEDULE_TIMEOUT) {
954 v.tm.tv_sec = sk->sk_rcvtimeo / HZ;
955 v.tm.tv_usec = ((sk->sk_rcvtimeo % HZ) * 1000000) / HZ;
960 lv = sizeof(struct timeval);
961 if (sk->sk_sndtimeo == MAX_SCHEDULE_TIMEOUT) {
965 v.tm.tv_sec = sk->sk_sndtimeo / HZ;
966 v.tm.tv_usec = ((sk->sk_sndtimeo % HZ) * 1000000) / HZ;
971 v.val = sk->sk_rcvlowat;
979 v.val = test_bit(SOCK_PASSCRED, &sock->flags) ? 1 : 0;
984 struct ucred peercred;
985 if (len > sizeof(peercred))
986 len = sizeof(peercred);
987 cred_to_ucred(sk->sk_peer_pid, sk->sk_peer_cred, &peercred);
988 if (copy_to_user(optval, &peercred, len))
997 if (sock->ops->getname(sock, (struct sockaddr *)address, &lv, 2))
1001 if (copy_to_user(optval, address, len))
1006 /* Dubious BSD thing... Probably nobody even uses it, but
1007 * the UNIX standard wants it for whatever reason... -DaveM
1010 v.val = sk->sk_state == TCP_LISTEN;
1014 v.val = test_bit(SOCK_PASSSEC, &sock->flags) ? 1 : 0;
1018 return security_socket_getpeersec_stream(sock, optval, optlen, len);
1021 v.val = sk->sk_mark;
1025 v.val = !!sock_flag(sk, SOCK_RXQ_OVFL);
1028 case SO_WIFI_STATUS:
1029 v.val = !!sock_flag(sk, SOCK_WIFI_STATUS);
1033 if (!sock->ops->set_peek_off)
1036 v.val = sk->sk_peek_off;
1039 v.val = !!sock_flag(sk, SOCK_NOFCS);
1042 return -ENOPROTOOPT;
1047 if (copy_to_user(optval, &v, len))
1050 if (put_user(len, optlen))
1056 * Initialize an sk_lock.
1058 * (We also register the sk_lock with the lock validator.)
1060 static inline void sock_lock_init(struct sock *sk)
1062 sock_lock_init_class_and_name(sk,
1063 af_family_slock_key_strings[sk->sk_family],
1064 af_family_slock_keys + sk->sk_family,
1065 af_family_key_strings[sk->sk_family],
1066 af_family_keys + sk->sk_family);
1070 * Copy all fields from osk to nsk but nsk->sk_refcnt must not change yet,
1071 * even temporarly, because of RCU lookups. sk_node should also be left as is.
1072 * We must not copy fields between sk_dontcopy_begin and sk_dontcopy_end
1074 static void sock_copy(struct sock *nsk, const struct sock *osk)
1076 #ifdef CONFIG_SECURITY_NETWORK
1077 void *sptr = nsk->sk_security;
1079 memcpy(nsk, osk, offsetof(struct sock, sk_dontcopy_begin));
1081 memcpy(&nsk->sk_dontcopy_end, &osk->sk_dontcopy_end,
1082 osk->sk_prot->obj_size - offsetof(struct sock, sk_dontcopy_end));
1084 #ifdef CONFIG_SECURITY_NETWORK
1085 nsk->sk_security = sptr;
1086 security_sk_clone(osk, nsk);
1091 * caches using SLAB_DESTROY_BY_RCU should let .next pointer from nulls nodes
1092 * un-modified. Special care is taken when initializing object to zero.
1094 static inline void sk_prot_clear_nulls(struct sock *sk, int size)
1096 if (offsetof(struct sock, sk_node.next) != 0)
1097 memset(sk, 0, offsetof(struct sock, sk_node.next));
1098 memset(&sk->sk_node.pprev, 0,
1099 size - offsetof(struct sock, sk_node.pprev));
1102 void sk_prot_clear_portaddr_nulls(struct sock *sk, int size)
1104 unsigned long nulls1, nulls2;
1106 nulls1 = offsetof(struct sock, __sk_common.skc_node.next);
1107 nulls2 = offsetof(struct sock, __sk_common.skc_portaddr_node.next);
1108 if (nulls1 > nulls2)
1109 swap(nulls1, nulls2);
1112 memset((char *)sk, 0, nulls1);
1113 memset((char *)sk + nulls1 + sizeof(void *), 0,
1114 nulls2 - nulls1 - sizeof(void *));
1115 memset((char *)sk + nulls2 + sizeof(void *), 0,
1116 size - nulls2 - sizeof(void *));
1118 EXPORT_SYMBOL(sk_prot_clear_portaddr_nulls);
1120 static struct sock *sk_prot_alloc(struct proto *prot, gfp_t priority,
1124 struct kmem_cache *slab;
1128 sk = kmem_cache_alloc(slab, priority & ~__GFP_ZERO);
1131 if (priority & __GFP_ZERO) {
1133 prot->clear_sk(sk, prot->obj_size);
1135 sk_prot_clear_nulls(sk, prot->obj_size);
1138 sk = kmalloc(prot->obj_size, priority);
1141 kmemcheck_annotate_bitfield(sk, flags);
1143 if (security_sk_alloc(sk, family, priority))
1146 if (!try_module_get(prot->owner))
1148 sk_tx_queue_clear(sk);
1154 security_sk_free(sk);
1157 kmem_cache_free(slab, sk);
1163 static void sk_prot_free(struct proto *prot, struct sock *sk)
1165 struct kmem_cache *slab;
1166 struct module *owner;
1168 owner = prot->owner;
1171 security_sk_free(sk);
1173 kmem_cache_free(slab, sk);
1179 #ifdef CONFIG_CGROUPS
1180 void sock_update_classid(struct sock *sk)
1184 rcu_read_lock(); /* doing current task, which cannot vanish. */
1185 classid = task_cls_classid(current);
1187 if (classid && classid != sk->sk_classid)
1188 sk->sk_classid = classid;
1190 EXPORT_SYMBOL(sock_update_classid);
1192 void sock_update_netprioidx(struct sock *sk)
1197 sk->sk_cgrp_prioidx = task_netprioidx(current);
1199 EXPORT_SYMBOL_GPL(sock_update_netprioidx);
1203 * sk_alloc - All socket objects are allocated here
1204 * @net: the applicable net namespace
1205 * @family: protocol family
1206 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
1207 * @prot: struct proto associated with this new sock instance
1209 struct sock *sk_alloc(struct net *net, int family, gfp_t priority,
1214 sk = sk_prot_alloc(prot, priority | __GFP_ZERO, family);
1216 sk->sk_family = family;
1218 * See comment in struct sock definition to understand
1219 * why we need sk_prot_creator -acme
1221 sk->sk_prot = sk->sk_prot_creator = prot;
1223 sock_net_set(sk, get_net(net));
1224 atomic_set(&sk->sk_wmem_alloc, 1);
1226 sock_update_classid(sk);
1227 sock_update_netprioidx(sk);
1232 EXPORT_SYMBOL(sk_alloc);
1234 static void __sk_free(struct sock *sk)
1236 struct sk_filter *filter;
1238 if (sk->sk_destruct)
1239 sk->sk_destruct(sk);
1241 filter = rcu_dereference_check(sk->sk_filter,
1242 atomic_read(&sk->sk_wmem_alloc) == 0);
1244 sk_filter_uncharge(sk, filter);
1245 RCU_INIT_POINTER(sk->sk_filter, NULL);
1248 sock_disable_timestamp(sk, SK_FLAGS_TIMESTAMP);
1250 if (atomic_read(&sk->sk_omem_alloc))
1251 printk(KERN_DEBUG "%s: optmem leakage (%d bytes) detected.\n",
1252 __func__, atomic_read(&sk->sk_omem_alloc));
1254 if (sk->sk_peer_cred)
1255 put_cred(sk->sk_peer_cred);
1256 put_pid(sk->sk_peer_pid);
1257 put_net(sock_net(sk));
1258 sk_prot_free(sk->sk_prot_creator, sk);
1261 void sk_free(struct sock *sk)
1264 * We subtract one from sk_wmem_alloc and can know if
1265 * some packets are still in some tx queue.
1266 * If not null, sock_wfree() will call __sk_free(sk) later
1268 if (atomic_dec_and_test(&sk->sk_wmem_alloc))
1271 EXPORT_SYMBOL(sk_free);
1274 * Last sock_put should drop reference to sk->sk_net. It has already
1275 * been dropped in sk_change_net. Taking reference to stopping namespace
1277 * Take reference to a socket to remove it from hash _alive_ and after that
1278 * destroy it in the context of init_net.
1280 void sk_release_kernel(struct sock *sk)
1282 if (sk == NULL || sk->sk_socket == NULL)
1286 sock_release(sk->sk_socket);
1287 release_net(sock_net(sk));
1288 sock_net_set(sk, get_net(&init_net));
1291 EXPORT_SYMBOL(sk_release_kernel);
1293 static void sk_update_clone(const struct sock *sk, struct sock *newsk)
1295 if (mem_cgroup_sockets_enabled && sk->sk_cgrp)
1296 sock_update_memcg(newsk);
1300 * sk_clone_lock - clone a socket, and lock its clone
1301 * @sk: the socket to clone
1302 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
1304 * Caller must unlock socket even in error path (bh_unlock_sock(newsk))
1306 struct sock *sk_clone_lock(const struct sock *sk, const gfp_t priority)
1310 newsk = sk_prot_alloc(sk->sk_prot, priority, sk->sk_family);
1311 if (newsk != NULL) {
1312 struct sk_filter *filter;
1314 sock_copy(newsk, sk);
1317 get_net(sock_net(newsk));
1318 sk_node_init(&newsk->sk_node);
1319 sock_lock_init(newsk);
1320 bh_lock_sock(newsk);
1321 newsk->sk_backlog.head = newsk->sk_backlog.tail = NULL;
1322 newsk->sk_backlog.len = 0;
1324 atomic_set(&newsk->sk_rmem_alloc, 0);
1326 * sk_wmem_alloc set to one (see sk_free() and sock_wfree())
1328 atomic_set(&newsk->sk_wmem_alloc, 1);
1329 atomic_set(&newsk->sk_omem_alloc, 0);
1330 skb_queue_head_init(&newsk->sk_receive_queue);
1331 skb_queue_head_init(&newsk->sk_write_queue);
1332 #ifdef CONFIG_NET_DMA
1333 skb_queue_head_init(&newsk->sk_async_wait_queue);
1336 spin_lock_init(&newsk->sk_dst_lock);
1337 rwlock_init(&newsk->sk_callback_lock);
1338 lockdep_set_class_and_name(&newsk->sk_callback_lock,
1339 af_callback_keys + newsk->sk_family,
1340 af_family_clock_key_strings[newsk->sk_family]);
1342 newsk->sk_dst_cache = NULL;
1343 newsk->sk_wmem_queued = 0;
1344 newsk->sk_forward_alloc = 0;
1345 newsk->sk_send_head = NULL;
1346 newsk->sk_userlocks = sk->sk_userlocks & ~SOCK_BINDPORT_LOCK;
1348 sock_reset_flag(newsk, SOCK_DONE);
1349 skb_queue_head_init(&newsk->sk_error_queue);
1351 filter = rcu_dereference_protected(newsk->sk_filter, 1);
1353 sk_filter_charge(newsk, filter);
1355 if (unlikely(xfrm_sk_clone_policy(newsk))) {
1356 /* It is still raw copy of parent, so invalidate
1357 * destructor and make plain sk_free() */
1358 newsk->sk_destruct = NULL;
1359 bh_unlock_sock(newsk);
1366 newsk->sk_priority = 0;
1368 * Before updating sk_refcnt, we must commit prior changes to memory
1369 * (Documentation/RCU/rculist_nulls.txt for details)
1372 atomic_set(&newsk->sk_refcnt, 2);
1375 * Increment the counter in the same struct proto as the master
1376 * sock (sk_refcnt_debug_inc uses newsk->sk_prot->socks, that
1377 * is the same as sk->sk_prot->socks, as this field was copied
1380 * This _changes_ the previous behaviour, where
1381 * tcp_create_openreq_child always was incrementing the
1382 * equivalent to tcp_prot->socks (inet_sock_nr), so this have
1383 * to be taken into account in all callers. -acme
1385 sk_refcnt_debug_inc(newsk);
1386 sk_set_socket(newsk, NULL);
1387 newsk->sk_wq = NULL;
1389 sk_update_clone(sk, newsk);
1391 if (newsk->sk_prot->sockets_allocated)
1392 sk_sockets_allocated_inc(newsk);
1394 if (newsk->sk_flags & SK_FLAGS_TIMESTAMP)
1395 net_enable_timestamp();
1400 EXPORT_SYMBOL_GPL(sk_clone_lock);
1402 void sk_setup_caps(struct sock *sk, struct dst_entry *dst)
1404 __sk_dst_set(sk, dst);
1405 sk->sk_route_caps = dst->dev->features;
1406 if (sk->sk_route_caps & NETIF_F_GSO)
1407 sk->sk_route_caps |= NETIF_F_GSO_SOFTWARE;
1408 sk->sk_route_caps &= ~sk->sk_route_nocaps;
1409 if (sk_can_gso(sk)) {
1410 if (dst->header_len) {
1411 sk->sk_route_caps &= ~NETIF_F_GSO_MASK;
1413 sk->sk_route_caps |= NETIF_F_SG | NETIF_F_HW_CSUM;
1414 sk->sk_gso_max_size = dst->dev->gso_max_size;
1418 EXPORT_SYMBOL_GPL(sk_setup_caps);
1420 void __init sk_init(void)
1422 if (totalram_pages <= 4096) {
1423 sysctl_wmem_max = 32767;
1424 sysctl_rmem_max = 32767;
1425 sysctl_wmem_default = 32767;
1426 sysctl_rmem_default = 32767;
1427 } else if (totalram_pages >= 131072) {
1428 sysctl_wmem_max = 131071;
1429 sysctl_rmem_max = 131071;
1434 * Simple resource managers for sockets.
1439 * Write buffer destructor automatically called from kfree_skb.
1441 void sock_wfree(struct sk_buff *skb)
1443 struct sock *sk = skb->sk;
1444 unsigned int len = skb->truesize;
1446 if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE)) {
1448 * Keep a reference on sk_wmem_alloc, this will be released
1449 * after sk_write_space() call
1451 atomic_sub(len - 1, &sk->sk_wmem_alloc);
1452 sk->sk_write_space(sk);
1456 * if sk_wmem_alloc reaches 0, we must finish what sk_free()
1457 * could not do because of in-flight packets
1459 if (atomic_sub_and_test(len, &sk->sk_wmem_alloc))
1462 EXPORT_SYMBOL(sock_wfree);
1465 * Read buffer destructor automatically called from kfree_skb.
1467 void sock_rfree(struct sk_buff *skb)
1469 struct sock *sk = skb->sk;
1470 unsigned int len = skb->truesize;
1472 atomic_sub(len, &sk->sk_rmem_alloc);
1473 sk_mem_uncharge(sk, len);
1475 EXPORT_SYMBOL(sock_rfree);
1478 int sock_i_uid(struct sock *sk)
1482 read_lock_bh(&sk->sk_callback_lock);
1483 uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : 0;
1484 read_unlock_bh(&sk->sk_callback_lock);
1487 EXPORT_SYMBOL(sock_i_uid);
1489 unsigned long sock_i_ino(struct sock *sk)
1493 read_lock_bh(&sk->sk_callback_lock);
1494 ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0;
1495 read_unlock_bh(&sk->sk_callback_lock);
1498 EXPORT_SYMBOL(sock_i_ino);
1501 * Allocate a skb from the socket's send buffer.
1503 struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force,
1506 if (force || atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
1507 struct sk_buff *skb = alloc_skb(size, priority);
1509 skb_set_owner_w(skb, sk);
1515 EXPORT_SYMBOL(sock_wmalloc);
1518 * Allocate a skb from the socket's receive buffer.
1520 struct sk_buff *sock_rmalloc(struct sock *sk, unsigned long size, int force,
1523 if (force || atomic_read(&sk->sk_rmem_alloc) < sk->sk_rcvbuf) {
1524 struct sk_buff *skb = alloc_skb(size, priority);
1526 skb_set_owner_r(skb, sk);
1534 * Allocate a memory block from the socket's option memory buffer.
1536 void *sock_kmalloc(struct sock *sk, int size, gfp_t priority)
1538 if ((unsigned)size <= sysctl_optmem_max &&
1539 atomic_read(&sk->sk_omem_alloc) + size < sysctl_optmem_max) {
1541 /* First do the add, to avoid the race if kmalloc
1544 atomic_add(size, &sk->sk_omem_alloc);
1545 mem = kmalloc(size, priority);
1548 atomic_sub(size, &sk->sk_omem_alloc);
1552 EXPORT_SYMBOL(sock_kmalloc);
1555 * Free an option memory block.
1557 void sock_kfree_s(struct sock *sk, void *mem, int size)
1560 atomic_sub(size, &sk->sk_omem_alloc);
1562 EXPORT_SYMBOL(sock_kfree_s);
1564 /* It is almost wait_for_tcp_memory minus release_sock/lock_sock.
1565 I think, these locks should be removed for datagram sockets.
1567 static long sock_wait_for_wmem(struct sock *sk, long timeo)
1571 clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1575 if (signal_pending(current))
1577 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1578 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1579 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf)
1581 if (sk->sk_shutdown & SEND_SHUTDOWN)
1585 timeo = schedule_timeout(timeo);
1587 finish_wait(sk_sleep(sk), &wait);
1593 * Generic send/receive buffer handlers
1596 struct sk_buff *sock_alloc_send_pskb(struct sock *sk, unsigned long header_len,
1597 unsigned long data_len, int noblock,
1600 struct sk_buff *skb;
1605 gfp_mask = sk->sk_allocation;
1606 if (gfp_mask & __GFP_WAIT)
1607 gfp_mask |= __GFP_REPEAT;
1609 timeo = sock_sndtimeo(sk, noblock);
1611 err = sock_error(sk);
1616 if (sk->sk_shutdown & SEND_SHUTDOWN)
1619 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
1620 skb = alloc_skb(header_len, gfp_mask);
1625 /* No pages, we're done... */
1629 npages = (data_len + (PAGE_SIZE - 1)) >> PAGE_SHIFT;
1630 skb->truesize += data_len;
1631 skb_shinfo(skb)->nr_frags = npages;
1632 for (i = 0; i < npages; i++) {
1635 page = alloc_pages(sk->sk_allocation, 0);
1638 skb_shinfo(skb)->nr_frags = i;
1643 __skb_fill_page_desc(skb, i,
1645 (data_len >= PAGE_SIZE ?
1648 data_len -= PAGE_SIZE;
1651 /* Full success... */
1657 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1658 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1662 if (signal_pending(current))
1664 timeo = sock_wait_for_wmem(sk, timeo);
1667 skb_set_owner_w(skb, sk);
1671 err = sock_intr_errno(timeo);
1676 EXPORT_SYMBOL(sock_alloc_send_pskb);
1678 struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size,
1679 int noblock, int *errcode)
1681 return sock_alloc_send_pskb(sk, size, 0, noblock, errcode);
1683 EXPORT_SYMBOL(sock_alloc_send_skb);
1685 static void __lock_sock(struct sock *sk)
1686 __releases(&sk->sk_lock.slock)
1687 __acquires(&sk->sk_lock.slock)
1692 prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait,
1693 TASK_UNINTERRUPTIBLE);
1694 spin_unlock_bh(&sk->sk_lock.slock);
1696 spin_lock_bh(&sk->sk_lock.slock);
1697 if (!sock_owned_by_user(sk))
1700 finish_wait(&sk->sk_lock.wq, &wait);
1703 static void __release_sock(struct sock *sk)
1704 __releases(&sk->sk_lock.slock)
1705 __acquires(&sk->sk_lock.slock)
1707 struct sk_buff *skb = sk->sk_backlog.head;
1710 sk->sk_backlog.head = sk->sk_backlog.tail = NULL;
1714 struct sk_buff *next = skb->next;
1716 WARN_ON_ONCE(skb_dst_is_noref(skb));
1718 sk_backlog_rcv(sk, skb);
1721 * We are in process context here with softirqs
1722 * disabled, use cond_resched_softirq() to preempt.
1723 * This is safe to do because we've taken the backlog
1726 cond_resched_softirq();
1729 } while (skb != NULL);
1732 } while ((skb = sk->sk_backlog.head) != NULL);
1735 * Doing the zeroing here guarantee we can not loop forever
1736 * while a wild producer attempts to flood us.
1738 sk->sk_backlog.len = 0;
1742 * sk_wait_data - wait for data to arrive at sk_receive_queue
1743 * @sk: sock to wait on
1744 * @timeo: for how long
1746 * Now socket state including sk->sk_err is changed only under lock,
1747 * hence we may omit checks after joining wait queue.
1748 * We check receive queue before schedule() only as optimization;
1749 * it is very likely that release_sock() added new data.
1751 int sk_wait_data(struct sock *sk, long *timeo)
1756 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1757 set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
1758 rc = sk_wait_event(sk, timeo, !skb_queue_empty(&sk->sk_receive_queue));
1759 clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
1760 finish_wait(sk_sleep(sk), &wait);
1763 EXPORT_SYMBOL(sk_wait_data);
1766 * __sk_mem_schedule - increase sk_forward_alloc and memory_allocated
1768 * @size: memory size to allocate
1769 * @kind: allocation type
1771 * If kind is SK_MEM_SEND, it means wmem allocation. Otherwise it means
1772 * rmem allocation. This function assumes that protocols which have
1773 * memory_pressure use sk_wmem_queued as write buffer accounting.
1775 int __sk_mem_schedule(struct sock *sk, int size, int kind)
1777 struct proto *prot = sk->sk_prot;
1778 int amt = sk_mem_pages(size);
1780 int parent_status = UNDER_LIMIT;
1782 sk->sk_forward_alloc += amt * SK_MEM_QUANTUM;
1784 allocated = sk_memory_allocated_add(sk, amt, &parent_status);
1787 if (parent_status == UNDER_LIMIT &&
1788 allocated <= sk_prot_mem_limits(sk, 0)) {
1789 sk_leave_memory_pressure(sk);
1793 /* Under pressure. (we or our parents) */
1794 if ((parent_status > SOFT_LIMIT) ||
1795 allocated > sk_prot_mem_limits(sk, 1))
1796 sk_enter_memory_pressure(sk);
1798 /* Over hard limit (we or our parents) */
1799 if ((parent_status == OVER_LIMIT) ||
1800 (allocated > sk_prot_mem_limits(sk, 2)))
1801 goto suppress_allocation;
1803 /* guarantee minimum buffer size under pressure */
1804 if (kind == SK_MEM_RECV) {
1805 if (atomic_read(&sk->sk_rmem_alloc) < prot->sysctl_rmem[0])
1808 } else { /* SK_MEM_SEND */
1809 if (sk->sk_type == SOCK_STREAM) {
1810 if (sk->sk_wmem_queued < prot->sysctl_wmem[0])
1812 } else if (atomic_read(&sk->sk_wmem_alloc) <
1813 prot->sysctl_wmem[0])
1817 if (sk_has_memory_pressure(sk)) {
1820 if (!sk_under_memory_pressure(sk))
1822 alloc = sk_sockets_allocated_read_positive(sk);
1823 if (sk_prot_mem_limits(sk, 2) > alloc *
1824 sk_mem_pages(sk->sk_wmem_queued +
1825 atomic_read(&sk->sk_rmem_alloc) +
1826 sk->sk_forward_alloc))
1830 suppress_allocation:
1832 if (kind == SK_MEM_SEND && sk->sk_type == SOCK_STREAM) {
1833 sk_stream_moderate_sndbuf(sk);
1835 /* Fail only if socket is _under_ its sndbuf.
1836 * In this case we cannot block, so that we have to fail.
1838 if (sk->sk_wmem_queued + size >= sk->sk_sndbuf)
1842 trace_sock_exceed_buf_limit(sk, prot, allocated);
1844 /* Alas. Undo changes. */
1845 sk->sk_forward_alloc -= amt * SK_MEM_QUANTUM;
1847 sk_memory_allocated_sub(sk, amt);
1851 EXPORT_SYMBOL(__sk_mem_schedule);
1854 * __sk_reclaim - reclaim memory_allocated
1857 void __sk_mem_reclaim(struct sock *sk)
1859 sk_memory_allocated_sub(sk,
1860 sk->sk_forward_alloc >> SK_MEM_QUANTUM_SHIFT);
1861 sk->sk_forward_alloc &= SK_MEM_QUANTUM - 1;
1863 if (sk_under_memory_pressure(sk) &&
1864 (sk_memory_allocated(sk) < sk_prot_mem_limits(sk, 0)))
1865 sk_leave_memory_pressure(sk);
1867 EXPORT_SYMBOL(__sk_mem_reclaim);
1871 * Set of default routines for initialising struct proto_ops when
1872 * the protocol does not support a particular function. In certain
1873 * cases where it makes no sense for a protocol to have a "do nothing"
1874 * function, some default processing is provided.
1877 int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len)
1881 EXPORT_SYMBOL(sock_no_bind);
1883 int sock_no_connect(struct socket *sock, struct sockaddr *saddr,
1888 EXPORT_SYMBOL(sock_no_connect);
1890 int sock_no_socketpair(struct socket *sock1, struct socket *sock2)
1894 EXPORT_SYMBOL(sock_no_socketpair);
1896 int sock_no_accept(struct socket *sock, struct socket *newsock, int flags)
1900 EXPORT_SYMBOL(sock_no_accept);
1902 int sock_no_getname(struct socket *sock, struct sockaddr *saddr,
1907 EXPORT_SYMBOL(sock_no_getname);
1909 unsigned int sock_no_poll(struct file *file, struct socket *sock, poll_table *pt)
1913 EXPORT_SYMBOL(sock_no_poll);
1915 int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1919 EXPORT_SYMBOL(sock_no_ioctl);
1921 int sock_no_listen(struct socket *sock, int backlog)
1925 EXPORT_SYMBOL(sock_no_listen);
1927 int sock_no_shutdown(struct socket *sock, int how)
1931 EXPORT_SYMBOL(sock_no_shutdown);
1933 int sock_no_setsockopt(struct socket *sock, int level, int optname,
1934 char __user *optval, unsigned int optlen)
1938 EXPORT_SYMBOL(sock_no_setsockopt);
1940 int sock_no_getsockopt(struct socket *sock, int level, int optname,
1941 char __user *optval, int __user *optlen)
1945 EXPORT_SYMBOL(sock_no_getsockopt);
1947 int sock_no_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
1952 EXPORT_SYMBOL(sock_no_sendmsg);
1954 int sock_no_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
1955 size_t len, int flags)
1959 EXPORT_SYMBOL(sock_no_recvmsg);
1961 int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma)
1963 /* Mirror missing mmap method error code */
1966 EXPORT_SYMBOL(sock_no_mmap);
1968 ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags)
1971 struct msghdr msg = {.msg_flags = flags};
1973 char *kaddr = kmap(page);
1974 iov.iov_base = kaddr + offset;
1976 res = kernel_sendmsg(sock, &msg, &iov, 1, size);
1980 EXPORT_SYMBOL(sock_no_sendpage);
1983 * Default Socket Callbacks
1986 static void sock_def_wakeup(struct sock *sk)
1988 struct socket_wq *wq;
1991 wq = rcu_dereference(sk->sk_wq);
1992 if (wq_has_sleeper(wq))
1993 wake_up_interruptible_all(&wq->wait);
1997 static void sock_def_error_report(struct sock *sk)
1999 struct socket_wq *wq;
2002 wq = rcu_dereference(sk->sk_wq);
2003 if (wq_has_sleeper(wq))
2004 wake_up_interruptible_poll(&wq->wait, POLLERR);
2005 sk_wake_async(sk, SOCK_WAKE_IO, POLL_ERR);
2009 static void sock_def_readable(struct sock *sk, int len)
2011 struct socket_wq *wq;
2014 wq = rcu_dereference(sk->sk_wq);
2015 if (wq_has_sleeper(wq))
2016 wake_up_interruptible_sync_poll(&wq->wait, POLLIN | POLLPRI |
2017 POLLRDNORM | POLLRDBAND);
2018 sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN);
2022 static void sock_def_write_space(struct sock *sk)
2024 struct socket_wq *wq;
2028 /* Do not wake up a writer until he can make "significant"
2031 if ((atomic_read(&sk->sk_wmem_alloc) << 1) <= sk->sk_sndbuf) {
2032 wq = rcu_dereference(sk->sk_wq);
2033 if (wq_has_sleeper(wq))
2034 wake_up_interruptible_sync_poll(&wq->wait, POLLOUT |
2035 POLLWRNORM | POLLWRBAND);
2037 /* Should agree with poll, otherwise some programs break */
2038 if (sock_writeable(sk))
2039 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
2045 static void sock_def_destruct(struct sock *sk)
2047 kfree(sk->sk_protinfo);
2050 void sk_send_sigurg(struct sock *sk)
2052 if (sk->sk_socket && sk->sk_socket->file)
2053 if (send_sigurg(&sk->sk_socket->file->f_owner))
2054 sk_wake_async(sk, SOCK_WAKE_URG, POLL_PRI);
2056 EXPORT_SYMBOL(sk_send_sigurg);
2058 void sk_reset_timer(struct sock *sk, struct timer_list* timer,
2059 unsigned long expires)
2061 if (!mod_timer(timer, expires))
2064 EXPORT_SYMBOL(sk_reset_timer);
2066 void sk_stop_timer(struct sock *sk, struct timer_list* timer)
2068 if (timer_pending(timer) && del_timer(timer))
2071 EXPORT_SYMBOL(sk_stop_timer);
2073 void sock_init_data(struct socket *sock, struct sock *sk)
2075 skb_queue_head_init(&sk->sk_receive_queue);
2076 skb_queue_head_init(&sk->sk_write_queue);
2077 skb_queue_head_init(&sk->sk_error_queue);
2078 #ifdef CONFIG_NET_DMA
2079 skb_queue_head_init(&sk->sk_async_wait_queue);
2082 sk->sk_send_head = NULL;
2084 init_timer(&sk->sk_timer);
2086 sk->sk_allocation = GFP_KERNEL;
2087 sk->sk_rcvbuf = sysctl_rmem_default;
2088 sk->sk_sndbuf = sysctl_wmem_default;
2089 sk->sk_state = TCP_CLOSE;
2090 sk_set_socket(sk, sock);
2092 sock_set_flag(sk, SOCK_ZAPPED);
2095 sk->sk_type = sock->type;
2096 sk->sk_wq = sock->wq;
2101 spin_lock_init(&sk->sk_dst_lock);
2102 rwlock_init(&sk->sk_callback_lock);
2103 lockdep_set_class_and_name(&sk->sk_callback_lock,
2104 af_callback_keys + sk->sk_family,
2105 af_family_clock_key_strings[sk->sk_family]);
2107 sk->sk_state_change = sock_def_wakeup;
2108 sk->sk_data_ready = sock_def_readable;
2109 sk->sk_write_space = sock_def_write_space;
2110 sk->sk_error_report = sock_def_error_report;
2111 sk->sk_destruct = sock_def_destruct;
2113 sk->sk_sndmsg_page = NULL;
2114 sk->sk_sndmsg_off = 0;
2115 sk->sk_peek_off = -1;
2117 sk->sk_peer_pid = NULL;
2118 sk->sk_peer_cred = NULL;
2119 sk->sk_write_pending = 0;
2120 sk->sk_rcvlowat = 1;
2121 sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT;
2122 sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT;
2124 sk->sk_stamp = ktime_set(-1L, 0);
2127 * Before updating sk_refcnt, we must commit prior changes to memory
2128 * (Documentation/RCU/rculist_nulls.txt for details)
2131 atomic_set(&sk->sk_refcnt, 1);
2132 atomic_set(&sk->sk_drops, 0);
2134 EXPORT_SYMBOL(sock_init_data);
2136 void lock_sock_nested(struct sock *sk, int subclass)
2139 spin_lock_bh(&sk->sk_lock.slock);
2140 if (sk->sk_lock.owned)
2142 sk->sk_lock.owned = 1;
2143 spin_unlock(&sk->sk_lock.slock);
2145 * The sk_lock has mutex_lock() semantics here:
2147 mutex_acquire(&sk->sk_lock.dep_map, subclass, 0, _RET_IP_);
2150 EXPORT_SYMBOL(lock_sock_nested);
2152 void release_sock(struct sock *sk)
2155 * The sk_lock has mutex_unlock() semantics:
2157 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_);
2159 spin_lock_bh(&sk->sk_lock.slock);
2160 if (sk->sk_backlog.tail)
2162 sk->sk_lock.owned = 0;
2163 if (waitqueue_active(&sk->sk_lock.wq))
2164 wake_up(&sk->sk_lock.wq);
2165 spin_unlock_bh(&sk->sk_lock.slock);
2167 EXPORT_SYMBOL(release_sock);
2170 * lock_sock_fast - fast version of lock_sock
2173 * This version should be used for very small section, where process wont block
2174 * return false if fast path is taken
2175 * sk_lock.slock locked, owned = 0, BH disabled
2176 * return true if slow path is taken
2177 * sk_lock.slock unlocked, owned = 1, BH enabled
2179 bool lock_sock_fast(struct sock *sk)
2182 spin_lock_bh(&sk->sk_lock.slock);
2184 if (!sk->sk_lock.owned)
2186 * Note : We must disable BH
2191 sk->sk_lock.owned = 1;
2192 spin_unlock(&sk->sk_lock.slock);
2194 * The sk_lock has mutex_lock() semantics here:
2196 mutex_acquire(&sk->sk_lock.dep_map, 0, 0, _RET_IP_);
2200 EXPORT_SYMBOL(lock_sock_fast);
2202 int sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp)
2205 if (!sock_flag(sk, SOCK_TIMESTAMP))
2206 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
2207 tv = ktime_to_timeval(sk->sk_stamp);
2208 if (tv.tv_sec == -1)
2210 if (tv.tv_sec == 0) {
2211 sk->sk_stamp = ktime_get_real();
2212 tv = ktime_to_timeval(sk->sk_stamp);
2214 return copy_to_user(userstamp, &tv, sizeof(tv)) ? -EFAULT : 0;
2216 EXPORT_SYMBOL(sock_get_timestamp);
2218 int sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp)
2221 if (!sock_flag(sk, SOCK_TIMESTAMP))
2222 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
2223 ts = ktime_to_timespec(sk->sk_stamp);
2224 if (ts.tv_sec == -1)
2226 if (ts.tv_sec == 0) {
2227 sk->sk_stamp = ktime_get_real();
2228 ts = ktime_to_timespec(sk->sk_stamp);
2230 return copy_to_user(userstamp, &ts, sizeof(ts)) ? -EFAULT : 0;
2232 EXPORT_SYMBOL(sock_get_timestampns);
2234 void sock_enable_timestamp(struct sock *sk, int flag)
2236 if (!sock_flag(sk, flag)) {
2237 unsigned long previous_flags = sk->sk_flags;
2239 sock_set_flag(sk, flag);
2241 * we just set one of the two flags which require net
2242 * time stamping, but time stamping might have been on
2243 * already because of the other one
2245 if (!(previous_flags & SK_FLAGS_TIMESTAMP))
2246 net_enable_timestamp();
2251 * Get a socket option on an socket.
2253 * FIX: POSIX 1003.1g is very ambiguous here. It states that
2254 * asynchronous errors should be reported by getsockopt. We assume
2255 * this means if you specify SO_ERROR (otherwise whats the point of it).
2257 int sock_common_getsockopt(struct socket *sock, int level, int optname,
2258 char __user *optval, int __user *optlen)
2260 struct sock *sk = sock->sk;
2262 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
2264 EXPORT_SYMBOL(sock_common_getsockopt);
2266 #ifdef CONFIG_COMPAT
2267 int compat_sock_common_getsockopt(struct socket *sock, int level, int optname,
2268 char __user *optval, int __user *optlen)
2270 struct sock *sk = sock->sk;
2272 if (sk->sk_prot->compat_getsockopt != NULL)
2273 return sk->sk_prot->compat_getsockopt(sk, level, optname,
2275 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
2277 EXPORT_SYMBOL(compat_sock_common_getsockopt);
2280 int sock_common_recvmsg(struct kiocb *iocb, struct socket *sock,
2281 struct msghdr *msg, size_t size, int flags)
2283 struct sock *sk = sock->sk;
2287 err = sk->sk_prot->recvmsg(iocb, sk, msg, size, flags & MSG_DONTWAIT,
2288 flags & ~MSG_DONTWAIT, &addr_len);
2290 msg->msg_namelen = addr_len;
2293 EXPORT_SYMBOL(sock_common_recvmsg);
2296 * Set socket options on an inet socket.
2298 int sock_common_setsockopt(struct socket *sock, int level, int optname,
2299 char __user *optval, unsigned int optlen)
2301 struct sock *sk = sock->sk;
2303 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
2305 EXPORT_SYMBOL(sock_common_setsockopt);
2307 #ifdef CONFIG_COMPAT
2308 int compat_sock_common_setsockopt(struct socket *sock, int level, int optname,
2309 char __user *optval, unsigned int optlen)
2311 struct sock *sk = sock->sk;
2313 if (sk->sk_prot->compat_setsockopt != NULL)
2314 return sk->sk_prot->compat_setsockopt(sk, level, optname,
2316 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
2318 EXPORT_SYMBOL(compat_sock_common_setsockopt);
2321 void sk_common_release(struct sock *sk)
2323 if (sk->sk_prot->destroy)
2324 sk->sk_prot->destroy(sk);
2327 * Observation: when sock_common_release is called, processes have
2328 * no access to socket. But net still has.
2329 * Step one, detach it from networking:
2331 * A. Remove from hash tables.
2334 sk->sk_prot->unhash(sk);
2337 * In this point socket cannot receive new packets, but it is possible
2338 * that some packets are in flight because some CPU runs receiver and
2339 * did hash table lookup before we unhashed socket. They will achieve
2340 * receive queue and will be purged by socket destructor.
2342 * Also we still have packets pending on receive queue and probably,
2343 * our own packets waiting in device queues. sock_destroy will drain
2344 * receive queue, but transmitted packets will delay socket destruction
2345 * until the last reference will be released.
2350 xfrm_sk_free_policy(sk);
2352 sk_refcnt_debug_release(sk);
2355 EXPORT_SYMBOL(sk_common_release);
2357 #ifdef CONFIG_PROC_FS
2358 #define PROTO_INUSE_NR 64 /* should be enough for the first time */
2360 int val[PROTO_INUSE_NR];
2363 static DECLARE_BITMAP(proto_inuse_idx, PROTO_INUSE_NR);
2365 #ifdef CONFIG_NET_NS
2366 void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
2368 __this_cpu_add(net->core.inuse->val[prot->inuse_idx], val);
2370 EXPORT_SYMBOL_GPL(sock_prot_inuse_add);
2372 int sock_prot_inuse_get(struct net *net, struct proto *prot)
2374 int cpu, idx = prot->inuse_idx;
2377 for_each_possible_cpu(cpu)
2378 res += per_cpu_ptr(net->core.inuse, cpu)->val[idx];
2380 return res >= 0 ? res : 0;
2382 EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
2384 static int __net_init sock_inuse_init_net(struct net *net)
2386 net->core.inuse = alloc_percpu(struct prot_inuse);
2387 return net->core.inuse ? 0 : -ENOMEM;
2390 static void __net_exit sock_inuse_exit_net(struct net *net)
2392 free_percpu(net->core.inuse);
2395 static struct pernet_operations net_inuse_ops = {
2396 .init = sock_inuse_init_net,
2397 .exit = sock_inuse_exit_net,
2400 static __init int net_inuse_init(void)
2402 if (register_pernet_subsys(&net_inuse_ops))
2403 panic("Cannot initialize net inuse counters");
2408 core_initcall(net_inuse_init);
2410 static DEFINE_PER_CPU(struct prot_inuse, prot_inuse);
2412 void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
2414 __this_cpu_add(prot_inuse.val[prot->inuse_idx], val);
2416 EXPORT_SYMBOL_GPL(sock_prot_inuse_add);
2418 int sock_prot_inuse_get(struct net *net, struct proto *prot)
2420 int cpu, idx = prot->inuse_idx;
2423 for_each_possible_cpu(cpu)
2424 res += per_cpu(prot_inuse, cpu).val[idx];
2426 return res >= 0 ? res : 0;
2428 EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
2431 static void assign_proto_idx(struct proto *prot)
2433 prot->inuse_idx = find_first_zero_bit(proto_inuse_idx, PROTO_INUSE_NR);
2435 if (unlikely(prot->inuse_idx == PROTO_INUSE_NR - 1)) {
2436 printk(KERN_ERR "PROTO_INUSE_NR exhausted\n");
2440 set_bit(prot->inuse_idx, proto_inuse_idx);
2443 static void release_proto_idx(struct proto *prot)
2445 if (prot->inuse_idx != PROTO_INUSE_NR - 1)
2446 clear_bit(prot->inuse_idx, proto_inuse_idx);
2449 static inline void assign_proto_idx(struct proto *prot)
2453 static inline void release_proto_idx(struct proto *prot)
2458 int proto_register(struct proto *prot, int alloc_slab)
2461 prot->slab = kmem_cache_create(prot->name, prot->obj_size, 0,
2462 SLAB_HWCACHE_ALIGN | prot->slab_flags,
2465 if (prot->slab == NULL) {
2466 printk(KERN_CRIT "%s: Can't create sock SLAB cache!\n",
2471 if (prot->rsk_prot != NULL) {
2472 prot->rsk_prot->slab_name = kasprintf(GFP_KERNEL, "request_sock_%s", prot->name);
2473 if (prot->rsk_prot->slab_name == NULL)
2474 goto out_free_sock_slab;
2476 prot->rsk_prot->slab = kmem_cache_create(prot->rsk_prot->slab_name,
2477 prot->rsk_prot->obj_size, 0,
2478 SLAB_HWCACHE_ALIGN, NULL);
2480 if (prot->rsk_prot->slab == NULL) {
2481 printk(KERN_CRIT "%s: Can't create request sock SLAB cache!\n",
2483 goto out_free_request_sock_slab_name;
2487 if (prot->twsk_prot != NULL) {
2488 prot->twsk_prot->twsk_slab_name = kasprintf(GFP_KERNEL, "tw_sock_%s", prot->name);
2490 if (prot->twsk_prot->twsk_slab_name == NULL)
2491 goto out_free_request_sock_slab;
2493 prot->twsk_prot->twsk_slab =
2494 kmem_cache_create(prot->twsk_prot->twsk_slab_name,
2495 prot->twsk_prot->twsk_obj_size,
2497 SLAB_HWCACHE_ALIGN |
2500 if (prot->twsk_prot->twsk_slab == NULL)
2501 goto out_free_timewait_sock_slab_name;
2505 mutex_lock(&proto_list_mutex);
2506 list_add(&prot->node, &proto_list);
2507 assign_proto_idx(prot);
2508 mutex_unlock(&proto_list_mutex);
2511 out_free_timewait_sock_slab_name:
2512 kfree(prot->twsk_prot->twsk_slab_name);
2513 out_free_request_sock_slab:
2514 if (prot->rsk_prot && prot->rsk_prot->slab) {
2515 kmem_cache_destroy(prot->rsk_prot->slab);
2516 prot->rsk_prot->slab = NULL;
2518 out_free_request_sock_slab_name:
2520 kfree(prot->rsk_prot->slab_name);
2522 kmem_cache_destroy(prot->slab);
2527 EXPORT_SYMBOL(proto_register);
2529 void proto_unregister(struct proto *prot)
2531 mutex_lock(&proto_list_mutex);
2532 release_proto_idx(prot);
2533 list_del(&prot->node);
2534 mutex_unlock(&proto_list_mutex);
2536 if (prot->slab != NULL) {
2537 kmem_cache_destroy(prot->slab);
2541 if (prot->rsk_prot != NULL && prot->rsk_prot->slab != NULL) {
2542 kmem_cache_destroy(prot->rsk_prot->slab);
2543 kfree(prot->rsk_prot->slab_name);
2544 prot->rsk_prot->slab = NULL;
2547 if (prot->twsk_prot != NULL && prot->twsk_prot->twsk_slab != NULL) {
2548 kmem_cache_destroy(prot->twsk_prot->twsk_slab);
2549 kfree(prot->twsk_prot->twsk_slab_name);
2550 prot->twsk_prot->twsk_slab = NULL;
2553 EXPORT_SYMBOL(proto_unregister);
2555 #ifdef CONFIG_PROC_FS
2556 static void *proto_seq_start(struct seq_file *seq, loff_t *pos)
2557 __acquires(proto_list_mutex)
2559 mutex_lock(&proto_list_mutex);
2560 return seq_list_start_head(&proto_list, *pos);
2563 static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2565 return seq_list_next(v, &proto_list, pos);
2568 static void proto_seq_stop(struct seq_file *seq, void *v)
2569 __releases(proto_list_mutex)
2571 mutex_unlock(&proto_list_mutex);
2574 static char proto_method_implemented(const void *method)
2576 return method == NULL ? 'n' : 'y';
2578 static long sock_prot_memory_allocated(struct proto *proto)
2580 return proto->memory_allocated != NULL ? proto_memory_allocated(proto): -1L;
2583 static char *sock_prot_memory_pressure(struct proto *proto)
2585 return proto->memory_pressure != NULL ?
2586 proto_memory_pressure(proto) ? "yes" : "no" : "NI";
2589 static void proto_seq_printf(struct seq_file *seq, struct proto *proto)
2592 seq_printf(seq, "%-9s %4u %6d %6ld %-3s %6u %-3s %-10s "
2593 "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n",
2596 sock_prot_inuse_get(seq_file_net(seq), proto),
2597 sock_prot_memory_allocated(proto),
2598 sock_prot_memory_pressure(proto),
2600 proto->slab == NULL ? "no" : "yes",
2601 module_name(proto->owner),
2602 proto_method_implemented(proto->close),
2603 proto_method_implemented(proto->connect),
2604 proto_method_implemented(proto->disconnect),
2605 proto_method_implemented(proto->accept),
2606 proto_method_implemented(proto->ioctl),
2607 proto_method_implemented(proto->init),
2608 proto_method_implemented(proto->destroy),
2609 proto_method_implemented(proto->shutdown),
2610 proto_method_implemented(proto->setsockopt),
2611 proto_method_implemented(proto->getsockopt),
2612 proto_method_implemented(proto->sendmsg),
2613 proto_method_implemented(proto->recvmsg),
2614 proto_method_implemented(proto->sendpage),
2615 proto_method_implemented(proto->bind),
2616 proto_method_implemented(proto->backlog_rcv),
2617 proto_method_implemented(proto->hash),
2618 proto_method_implemented(proto->unhash),
2619 proto_method_implemented(proto->get_port),
2620 proto_method_implemented(proto->enter_memory_pressure));
2623 static int proto_seq_show(struct seq_file *seq, void *v)
2625 if (v == &proto_list)
2626 seq_printf(seq, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s",
2635 "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n");
2637 proto_seq_printf(seq, list_entry(v, struct proto, node));
2641 static const struct seq_operations proto_seq_ops = {
2642 .start = proto_seq_start,
2643 .next = proto_seq_next,
2644 .stop = proto_seq_stop,
2645 .show = proto_seq_show,
2648 static int proto_seq_open(struct inode *inode, struct file *file)
2650 return seq_open_net(inode, file, &proto_seq_ops,
2651 sizeof(struct seq_net_private));
2654 static const struct file_operations proto_seq_fops = {
2655 .owner = THIS_MODULE,
2656 .open = proto_seq_open,
2658 .llseek = seq_lseek,
2659 .release = seq_release_net,
2662 static __net_init int proto_init_net(struct net *net)
2664 if (!proc_net_fops_create(net, "protocols", S_IRUGO, &proto_seq_fops))
2670 static __net_exit void proto_exit_net(struct net *net)
2672 proc_net_remove(net, "protocols");
2676 static __net_initdata struct pernet_operations proto_net_ops = {
2677 .init = proto_init_net,
2678 .exit = proto_exit_net,
2681 static int __init proto_init(void)
2683 return register_pernet_subsys(&proto_net_ops);
2686 subsys_initcall(proto_init);
2688 #endif /* PROC_FS */