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 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
94 #include <linux/capability.h>
95 #include <linux/errno.h>
96 #include <linux/types.h>
97 #include <linux/socket.h>
99 #include <linux/kernel.h>
100 #include <linux/module.h>
101 #include <linux/proc_fs.h>
102 #include <linux/seq_file.h>
103 #include <linux/sched.h>
104 #include <linux/timer.h>
105 #include <linux/string.h>
106 #include <linux/sockios.h>
107 #include <linux/net.h>
108 #include <linux/mm.h>
109 #include <linux/slab.h>
110 #include <linux/interrupt.h>
111 #include <linux/poll.h>
112 #include <linux/tcp.h>
113 #include <linux/init.h>
114 #include <linux/highmem.h>
115 #include <linux/user_namespace.h>
116 #include <linux/static_key.h>
117 #include <linux/memcontrol.h>
118 #include <linux/prefetch.h>
120 #include <asm/uaccess.h>
122 #include <linux/netdevice.h>
123 #include <net/protocol.h>
124 #include <linux/skbuff.h>
125 #include <net/net_namespace.h>
126 #include <net/request_sock.h>
127 #include <net/sock.h>
128 #include <linux/net_tstamp.h>
129 #include <net/xfrm.h>
130 #include <linux/ipsec.h>
131 #include <net/cls_cgroup.h>
132 #include <net/netprio_cgroup.h>
134 #include <linux/filter.h>
136 #include <trace/events/sock.h>
142 static DEFINE_MUTEX(proto_list_mutex);
143 static LIST_HEAD(proto_list);
145 #ifdef CONFIG_CGROUP_MEM_RES_CTLR_KMEM
146 int mem_cgroup_sockets_init(struct mem_cgroup *memcg, struct cgroup_subsys *ss)
151 mutex_lock(&proto_list_mutex);
152 list_for_each_entry(proto, &proto_list, node) {
153 if (proto->init_cgroup) {
154 ret = proto->init_cgroup(memcg, ss);
160 mutex_unlock(&proto_list_mutex);
163 list_for_each_entry_continue_reverse(proto, &proto_list, node)
164 if (proto->destroy_cgroup)
165 proto->destroy_cgroup(memcg);
166 mutex_unlock(&proto_list_mutex);
170 void mem_cgroup_sockets_destroy(struct mem_cgroup *memcg)
174 mutex_lock(&proto_list_mutex);
175 list_for_each_entry_reverse(proto, &proto_list, node)
176 if (proto->destroy_cgroup)
177 proto->destroy_cgroup(memcg);
178 mutex_unlock(&proto_list_mutex);
183 * Each address family might have different locking rules, so we have
184 * one slock key per address family:
186 static struct lock_class_key af_family_keys[AF_MAX];
187 static struct lock_class_key af_family_slock_keys[AF_MAX];
189 struct static_key memcg_socket_limit_enabled;
190 EXPORT_SYMBOL(memcg_socket_limit_enabled);
193 * Make lock validator output more readable. (we pre-construct these
194 * strings build-time, so that runtime initialization of socket
197 static const char *const af_family_key_strings[AF_MAX+1] = {
198 "sk_lock-AF_UNSPEC", "sk_lock-AF_UNIX" , "sk_lock-AF_INET" ,
199 "sk_lock-AF_AX25" , "sk_lock-AF_IPX" , "sk_lock-AF_APPLETALK",
200 "sk_lock-AF_NETROM", "sk_lock-AF_BRIDGE" , "sk_lock-AF_ATMPVC" ,
201 "sk_lock-AF_X25" , "sk_lock-AF_INET6" , "sk_lock-AF_ROSE" ,
202 "sk_lock-AF_DECnet", "sk_lock-AF_NETBEUI" , "sk_lock-AF_SECURITY" ,
203 "sk_lock-AF_KEY" , "sk_lock-AF_NETLINK" , "sk_lock-AF_PACKET" ,
204 "sk_lock-AF_ASH" , "sk_lock-AF_ECONET" , "sk_lock-AF_ATMSVC" ,
205 "sk_lock-AF_RDS" , "sk_lock-AF_SNA" , "sk_lock-AF_IRDA" ,
206 "sk_lock-AF_PPPOX" , "sk_lock-AF_WANPIPE" , "sk_lock-AF_LLC" ,
207 "sk_lock-27" , "sk_lock-28" , "sk_lock-AF_CAN" ,
208 "sk_lock-AF_TIPC" , "sk_lock-AF_BLUETOOTH", "sk_lock-IUCV" ,
209 "sk_lock-AF_RXRPC" , "sk_lock-AF_ISDN" , "sk_lock-AF_PHONET" ,
210 "sk_lock-AF_IEEE802154", "sk_lock-AF_CAIF" , "sk_lock-AF_ALG" ,
211 "sk_lock-AF_NFC" , "sk_lock-AF_MAX"
213 static const char *const af_family_slock_key_strings[AF_MAX+1] = {
214 "slock-AF_UNSPEC", "slock-AF_UNIX" , "slock-AF_INET" ,
215 "slock-AF_AX25" , "slock-AF_IPX" , "slock-AF_APPLETALK",
216 "slock-AF_NETROM", "slock-AF_BRIDGE" , "slock-AF_ATMPVC" ,
217 "slock-AF_X25" , "slock-AF_INET6" , "slock-AF_ROSE" ,
218 "slock-AF_DECnet", "slock-AF_NETBEUI" , "slock-AF_SECURITY" ,
219 "slock-AF_KEY" , "slock-AF_NETLINK" , "slock-AF_PACKET" ,
220 "slock-AF_ASH" , "slock-AF_ECONET" , "slock-AF_ATMSVC" ,
221 "slock-AF_RDS" , "slock-AF_SNA" , "slock-AF_IRDA" ,
222 "slock-AF_PPPOX" , "slock-AF_WANPIPE" , "slock-AF_LLC" ,
223 "slock-27" , "slock-28" , "slock-AF_CAN" ,
224 "slock-AF_TIPC" , "slock-AF_BLUETOOTH", "slock-AF_IUCV" ,
225 "slock-AF_RXRPC" , "slock-AF_ISDN" , "slock-AF_PHONET" ,
226 "slock-AF_IEEE802154", "slock-AF_CAIF" , "slock-AF_ALG" ,
227 "slock-AF_NFC" , "slock-AF_MAX"
229 static const char *const af_family_clock_key_strings[AF_MAX+1] = {
230 "clock-AF_UNSPEC", "clock-AF_UNIX" , "clock-AF_INET" ,
231 "clock-AF_AX25" , "clock-AF_IPX" , "clock-AF_APPLETALK",
232 "clock-AF_NETROM", "clock-AF_BRIDGE" , "clock-AF_ATMPVC" ,
233 "clock-AF_X25" , "clock-AF_INET6" , "clock-AF_ROSE" ,
234 "clock-AF_DECnet", "clock-AF_NETBEUI" , "clock-AF_SECURITY" ,
235 "clock-AF_KEY" , "clock-AF_NETLINK" , "clock-AF_PACKET" ,
236 "clock-AF_ASH" , "clock-AF_ECONET" , "clock-AF_ATMSVC" ,
237 "clock-AF_RDS" , "clock-AF_SNA" , "clock-AF_IRDA" ,
238 "clock-AF_PPPOX" , "clock-AF_WANPIPE" , "clock-AF_LLC" ,
239 "clock-27" , "clock-28" , "clock-AF_CAN" ,
240 "clock-AF_TIPC" , "clock-AF_BLUETOOTH", "clock-AF_IUCV" ,
241 "clock-AF_RXRPC" , "clock-AF_ISDN" , "clock-AF_PHONET" ,
242 "clock-AF_IEEE802154", "clock-AF_CAIF" , "clock-AF_ALG" ,
243 "clock-AF_NFC" , "clock-AF_MAX"
247 * sk_callback_lock locking rules are per-address-family,
248 * so split the lock classes by using a per-AF key:
250 static struct lock_class_key af_callback_keys[AF_MAX];
252 /* Take into consideration the size of the struct sk_buff overhead in the
253 * determination of these values, since that is non-constant across
254 * platforms. This makes socket queueing behavior and performance
255 * not depend upon such differences.
257 #define _SK_MEM_PACKETS 256
258 #define _SK_MEM_OVERHEAD SKB_TRUESIZE(256)
259 #define SK_WMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS)
260 #define SK_RMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS)
262 /* Run time adjustable parameters. */
263 __u32 sysctl_wmem_max __read_mostly = SK_WMEM_MAX;
264 EXPORT_SYMBOL(sysctl_wmem_max);
265 __u32 sysctl_rmem_max __read_mostly = SK_RMEM_MAX;
266 EXPORT_SYMBOL(sysctl_rmem_max);
267 __u32 sysctl_wmem_default __read_mostly = SK_WMEM_MAX;
268 __u32 sysctl_rmem_default __read_mostly = SK_RMEM_MAX;
270 /* Maximal space eaten by iovec or ancillary data plus some space */
271 int sysctl_optmem_max __read_mostly = sizeof(unsigned long)*(2*UIO_MAXIOV+512);
272 EXPORT_SYMBOL(sysctl_optmem_max);
274 #if defined(CONFIG_CGROUPS)
275 #if !defined(CONFIG_NET_CLS_CGROUP)
276 int net_cls_subsys_id = -1;
277 EXPORT_SYMBOL_GPL(net_cls_subsys_id);
279 #if !defined(CONFIG_NETPRIO_CGROUP)
280 int net_prio_subsys_id = -1;
281 EXPORT_SYMBOL_GPL(net_prio_subsys_id);
285 static int sock_set_timeout(long *timeo_p, char __user *optval, int optlen)
289 if (optlen < sizeof(tv))
291 if (copy_from_user(&tv, optval, sizeof(tv)))
293 if (tv.tv_usec < 0 || tv.tv_usec >= USEC_PER_SEC)
297 static int warned __read_mostly;
300 if (warned < 10 && net_ratelimit()) {
302 pr_info("%s: `%s' (pid %d) tries to set negative timeout\n",
303 __func__, current->comm, task_pid_nr(current));
307 *timeo_p = MAX_SCHEDULE_TIMEOUT;
308 if (tv.tv_sec == 0 && tv.tv_usec == 0)
310 if (tv.tv_sec < (MAX_SCHEDULE_TIMEOUT/HZ - 1))
311 *timeo_p = tv.tv_sec*HZ + (tv.tv_usec+(1000000/HZ-1))/(1000000/HZ);
315 static void sock_warn_obsolete_bsdism(const char *name)
318 static char warncomm[TASK_COMM_LEN];
319 if (strcmp(warncomm, current->comm) && warned < 5) {
320 strcpy(warncomm, current->comm);
321 pr_warn("process `%s' is using obsolete %s SO_BSDCOMPAT\n",
327 #define SK_FLAGS_TIMESTAMP ((1UL << SOCK_TIMESTAMP) | (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE))
329 static void sock_disable_timestamp(struct sock *sk, unsigned long flags)
331 if (sk->sk_flags & flags) {
332 sk->sk_flags &= ~flags;
333 if (!(sk->sk_flags & SK_FLAGS_TIMESTAMP))
334 net_disable_timestamp();
339 int sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
344 struct sk_buff_head *list = &sk->sk_receive_queue;
346 if (atomic_read(&sk->sk_rmem_alloc) >= sk->sk_rcvbuf) {
347 atomic_inc(&sk->sk_drops);
348 trace_sock_rcvqueue_full(sk, skb);
352 err = sk_filter(sk, skb);
356 if (!sk_rmem_schedule(sk, skb->truesize)) {
357 atomic_inc(&sk->sk_drops);
362 skb_set_owner_r(skb, sk);
364 /* Cache the SKB length before we tack it onto the receive
365 * queue. Once it is added it no longer belongs to us and
366 * may be freed by other threads of control pulling packets
371 /* we escape from rcu protected region, make sure we dont leak
376 spin_lock_irqsave(&list->lock, flags);
377 skb->dropcount = atomic_read(&sk->sk_drops);
378 __skb_queue_tail(list, skb);
379 spin_unlock_irqrestore(&list->lock, flags);
381 if (!sock_flag(sk, SOCK_DEAD))
382 sk->sk_data_ready(sk, skb_len);
385 EXPORT_SYMBOL(sock_queue_rcv_skb);
387 int sk_receive_skb(struct sock *sk, struct sk_buff *skb, const int nested)
389 int rc = NET_RX_SUCCESS;
391 if (sk_filter(sk, skb))
392 goto discard_and_relse;
396 if (sk_rcvqueues_full(sk, skb, sk->sk_rcvbuf)) {
397 atomic_inc(&sk->sk_drops);
398 goto discard_and_relse;
401 bh_lock_sock_nested(sk);
404 if (!sock_owned_by_user(sk)) {
406 * trylock + unlock semantics:
408 mutex_acquire(&sk->sk_lock.dep_map, 0, 1, _RET_IP_);
410 rc = sk_backlog_rcv(sk, skb);
412 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_);
413 } else if (sk_add_backlog(sk, skb, sk->sk_rcvbuf)) {
415 atomic_inc(&sk->sk_drops);
416 goto discard_and_relse;
427 EXPORT_SYMBOL(sk_receive_skb);
429 void sk_reset_txq(struct sock *sk)
431 sk_tx_queue_clear(sk);
433 EXPORT_SYMBOL(sk_reset_txq);
435 struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie)
437 struct dst_entry *dst = __sk_dst_get(sk);
439 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
440 sk_tx_queue_clear(sk);
441 RCU_INIT_POINTER(sk->sk_dst_cache, NULL);
448 EXPORT_SYMBOL(__sk_dst_check);
450 struct dst_entry *sk_dst_check(struct sock *sk, u32 cookie)
452 struct dst_entry *dst = sk_dst_get(sk);
454 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
462 EXPORT_SYMBOL(sk_dst_check);
464 static int sock_bindtodevice(struct sock *sk, char __user *optval, int optlen)
466 int ret = -ENOPROTOOPT;
467 #ifdef CONFIG_NETDEVICES
468 struct net *net = sock_net(sk);
469 char devname[IFNAMSIZ];
474 if (!capable(CAP_NET_RAW))
481 /* Bind this socket to a particular device like "eth0",
482 * as specified in the passed interface name. If the
483 * name is "" or the option length is zero the socket
486 if (optlen > IFNAMSIZ - 1)
487 optlen = IFNAMSIZ - 1;
488 memset(devname, 0, sizeof(devname));
491 if (copy_from_user(devname, optval, optlen))
495 if (devname[0] != '\0') {
496 struct net_device *dev;
499 dev = dev_get_by_name_rcu(net, devname);
501 index = dev->ifindex;
509 sk->sk_bound_dev_if = index;
521 static inline void sock_valbool_flag(struct sock *sk, int bit, int valbool)
524 sock_set_flag(sk, bit);
526 sock_reset_flag(sk, bit);
530 * This is meant for all protocols to use and covers goings on
531 * at the socket level. Everything here is generic.
534 int sock_setsockopt(struct socket *sock, int level, int optname,
535 char __user *optval, unsigned int optlen)
537 struct sock *sk = sock->sk;
544 * Options without arguments
547 if (optname == SO_BINDTODEVICE)
548 return sock_bindtodevice(sk, optval, optlen);
550 if (optlen < sizeof(int))
553 if (get_user(val, (int __user *)optval))
556 valbool = val ? 1 : 0;
562 if (val && !capable(CAP_NET_ADMIN))
565 sock_valbool_flag(sk, SOCK_DBG, valbool);
568 sk->sk_reuse = (valbool ? SK_CAN_REUSE : SK_NO_REUSE);
577 sock_valbool_flag(sk, SOCK_LOCALROUTE, valbool);
580 sock_valbool_flag(sk, SOCK_BROADCAST, valbool);
583 /* Don't error on this BSD doesn't and if you think
584 * about it this is right. Otherwise apps have to
585 * play 'guess the biggest size' games. RCVBUF/SNDBUF
586 * are treated in BSD as hints
588 val = min_t(u32, val, sysctl_wmem_max);
590 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
591 sk->sk_sndbuf = max_t(u32, val * 2, SOCK_MIN_SNDBUF);
592 /* Wake up sending tasks if we upped the value. */
593 sk->sk_write_space(sk);
597 if (!capable(CAP_NET_ADMIN)) {
604 /* Don't error on this BSD doesn't and if you think
605 * about it this is right. Otherwise apps have to
606 * play 'guess the biggest size' games. RCVBUF/SNDBUF
607 * are treated in BSD as hints
609 val = min_t(u32, val, sysctl_rmem_max);
611 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
613 * We double it on the way in to account for
614 * "struct sk_buff" etc. overhead. Applications
615 * assume that the SO_RCVBUF setting they make will
616 * allow that much actual data to be received on that
619 * Applications are unaware that "struct sk_buff" and
620 * other overheads allocate from the receive buffer
621 * during socket buffer allocation.
623 * And after considering the possible alternatives,
624 * returning the value we actually used in getsockopt
625 * is the most desirable behavior.
627 sk->sk_rcvbuf = max_t(u32, val * 2, SOCK_MIN_RCVBUF);
631 if (!capable(CAP_NET_ADMIN)) {
639 if (sk->sk_protocol == IPPROTO_TCP)
640 tcp_set_keepalive(sk, valbool);
642 sock_valbool_flag(sk, SOCK_KEEPOPEN, valbool);
646 sock_valbool_flag(sk, SOCK_URGINLINE, valbool);
650 sk->sk_no_check = valbool;
654 if ((val >= 0 && val <= 6) || capable(CAP_NET_ADMIN))
655 sk->sk_priority = val;
661 if (optlen < sizeof(ling)) {
662 ret = -EINVAL; /* 1003.1g */
665 if (copy_from_user(&ling, optval, sizeof(ling))) {
670 sock_reset_flag(sk, SOCK_LINGER);
672 #if (BITS_PER_LONG == 32)
673 if ((unsigned int)ling.l_linger >= MAX_SCHEDULE_TIMEOUT/HZ)
674 sk->sk_lingertime = MAX_SCHEDULE_TIMEOUT;
677 sk->sk_lingertime = (unsigned int)ling.l_linger * HZ;
678 sock_set_flag(sk, SOCK_LINGER);
683 sock_warn_obsolete_bsdism("setsockopt");
688 set_bit(SOCK_PASSCRED, &sock->flags);
690 clear_bit(SOCK_PASSCRED, &sock->flags);
696 if (optname == SO_TIMESTAMP)
697 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
699 sock_set_flag(sk, SOCK_RCVTSTAMPNS);
700 sock_set_flag(sk, SOCK_RCVTSTAMP);
701 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
703 sock_reset_flag(sk, SOCK_RCVTSTAMP);
704 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
708 case SO_TIMESTAMPING:
709 if (val & ~SOF_TIMESTAMPING_MASK) {
713 sock_valbool_flag(sk, SOCK_TIMESTAMPING_TX_HARDWARE,
714 val & SOF_TIMESTAMPING_TX_HARDWARE);
715 sock_valbool_flag(sk, SOCK_TIMESTAMPING_TX_SOFTWARE,
716 val & SOF_TIMESTAMPING_TX_SOFTWARE);
717 sock_valbool_flag(sk, SOCK_TIMESTAMPING_RX_HARDWARE,
718 val & SOF_TIMESTAMPING_RX_HARDWARE);
719 if (val & SOF_TIMESTAMPING_RX_SOFTWARE)
720 sock_enable_timestamp(sk,
721 SOCK_TIMESTAMPING_RX_SOFTWARE);
723 sock_disable_timestamp(sk,
724 (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE));
725 sock_valbool_flag(sk, SOCK_TIMESTAMPING_SOFTWARE,
726 val & SOF_TIMESTAMPING_SOFTWARE);
727 sock_valbool_flag(sk, SOCK_TIMESTAMPING_SYS_HARDWARE,
728 val & SOF_TIMESTAMPING_SYS_HARDWARE);
729 sock_valbool_flag(sk, SOCK_TIMESTAMPING_RAW_HARDWARE,
730 val & SOF_TIMESTAMPING_RAW_HARDWARE);
736 sk->sk_rcvlowat = val ? : 1;
740 ret = sock_set_timeout(&sk->sk_rcvtimeo, optval, optlen);
744 ret = sock_set_timeout(&sk->sk_sndtimeo, optval, optlen);
747 case SO_ATTACH_FILTER:
749 if (optlen == sizeof(struct sock_fprog)) {
750 struct sock_fprog fprog;
753 if (copy_from_user(&fprog, optval, sizeof(fprog)))
756 ret = sk_attach_filter(&fprog, sk);
760 case SO_DETACH_FILTER:
761 ret = sk_detach_filter(sk);
766 set_bit(SOCK_PASSSEC, &sock->flags);
768 clear_bit(SOCK_PASSSEC, &sock->flags);
771 if (!capable(CAP_NET_ADMIN))
777 /* We implement the SO_SNDLOWAT etc to
778 not be settable (1003.1g 5.3) */
780 sock_valbool_flag(sk, SOCK_RXQ_OVFL, valbool);
784 sock_valbool_flag(sk, SOCK_WIFI_STATUS, valbool);
788 if (sock->ops->set_peek_off)
789 sock->ops->set_peek_off(sk, val);
795 sock_valbool_flag(sk, SOCK_NOFCS, valbool);
805 EXPORT_SYMBOL(sock_setsockopt);
808 void cred_to_ucred(struct pid *pid, const struct cred *cred,
811 ucred->pid = pid_vnr(pid);
812 ucred->uid = ucred->gid = -1;
814 struct user_namespace *current_ns = current_user_ns();
816 ucred->uid = from_kuid(current_ns, cred->euid);
817 ucred->gid = from_kgid(current_ns, cred->egid);
820 EXPORT_SYMBOL_GPL(cred_to_ucred);
822 int sock_getsockopt(struct socket *sock, int level, int optname,
823 char __user *optval, int __user *optlen)
825 struct sock *sk = sock->sk;
833 int lv = sizeof(int);
836 if (get_user(len, optlen))
841 memset(&v, 0, sizeof(v));
845 v.val = sock_flag(sk, SOCK_DBG);
849 v.val = sock_flag(sk, SOCK_LOCALROUTE);
853 v.val = sock_flag(sk, SOCK_BROADCAST);
857 v.val = sk->sk_sndbuf;
861 v.val = sk->sk_rcvbuf;
865 v.val = sk->sk_reuse;
869 v.val = sock_flag(sk, SOCK_KEEPOPEN);
877 v.val = sk->sk_protocol;
881 v.val = sk->sk_family;
885 v.val = -sock_error(sk);
887 v.val = xchg(&sk->sk_err_soft, 0);
891 v.val = sock_flag(sk, SOCK_URGINLINE);
895 v.val = sk->sk_no_check;
899 v.val = sk->sk_priority;
904 v.ling.l_onoff = sock_flag(sk, SOCK_LINGER);
905 v.ling.l_linger = sk->sk_lingertime / HZ;
909 sock_warn_obsolete_bsdism("getsockopt");
913 v.val = sock_flag(sk, SOCK_RCVTSTAMP) &&
914 !sock_flag(sk, SOCK_RCVTSTAMPNS);
918 v.val = sock_flag(sk, SOCK_RCVTSTAMPNS);
921 case SO_TIMESTAMPING:
923 if (sock_flag(sk, SOCK_TIMESTAMPING_TX_HARDWARE))
924 v.val |= SOF_TIMESTAMPING_TX_HARDWARE;
925 if (sock_flag(sk, SOCK_TIMESTAMPING_TX_SOFTWARE))
926 v.val |= SOF_TIMESTAMPING_TX_SOFTWARE;
927 if (sock_flag(sk, SOCK_TIMESTAMPING_RX_HARDWARE))
928 v.val |= SOF_TIMESTAMPING_RX_HARDWARE;
929 if (sock_flag(sk, SOCK_TIMESTAMPING_RX_SOFTWARE))
930 v.val |= SOF_TIMESTAMPING_RX_SOFTWARE;
931 if (sock_flag(sk, SOCK_TIMESTAMPING_SOFTWARE))
932 v.val |= SOF_TIMESTAMPING_SOFTWARE;
933 if (sock_flag(sk, SOCK_TIMESTAMPING_SYS_HARDWARE))
934 v.val |= SOF_TIMESTAMPING_SYS_HARDWARE;
935 if (sock_flag(sk, SOCK_TIMESTAMPING_RAW_HARDWARE))
936 v.val |= SOF_TIMESTAMPING_RAW_HARDWARE;
940 lv = sizeof(struct timeval);
941 if (sk->sk_rcvtimeo == MAX_SCHEDULE_TIMEOUT) {
945 v.tm.tv_sec = sk->sk_rcvtimeo / HZ;
946 v.tm.tv_usec = ((sk->sk_rcvtimeo % HZ) * 1000000) / HZ;
951 lv = sizeof(struct timeval);
952 if (sk->sk_sndtimeo == MAX_SCHEDULE_TIMEOUT) {
956 v.tm.tv_sec = sk->sk_sndtimeo / HZ;
957 v.tm.tv_usec = ((sk->sk_sndtimeo % HZ) * 1000000) / HZ;
962 v.val = sk->sk_rcvlowat;
970 v.val = !!test_bit(SOCK_PASSCRED, &sock->flags);
975 struct ucred peercred;
976 if (len > sizeof(peercred))
977 len = sizeof(peercred);
978 cred_to_ucred(sk->sk_peer_pid, sk->sk_peer_cred, &peercred);
979 if (copy_to_user(optval, &peercred, len))
988 if (sock->ops->getname(sock, (struct sockaddr *)address, &lv, 2))
992 if (copy_to_user(optval, address, len))
997 /* Dubious BSD thing... Probably nobody even uses it, but
998 * the UNIX standard wants it for whatever reason... -DaveM
1001 v.val = sk->sk_state == TCP_LISTEN;
1005 v.val = !!test_bit(SOCK_PASSSEC, &sock->flags);
1009 return security_socket_getpeersec_stream(sock, optval, optlen, len);
1012 v.val = sk->sk_mark;
1016 v.val = sock_flag(sk, SOCK_RXQ_OVFL);
1019 case SO_WIFI_STATUS:
1020 v.val = sock_flag(sk, SOCK_WIFI_STATUS);
1024 if (!sock->ops->set_peek_off)
1027 v.val = sk->sk_peek_off;
1030 v.val = sock_flag(sk, SOCK_NOFCS);
1033 return -ENOPROTOOPT;
1038 if (copy_to_user(optval, &v, len))
1041 if (put_user(len, optlen))
1047 * Initialize an sk_lock.
1049 * (We also register the sk_lock with the lock validator.)
1051 static inline void sock_lock_init(struct sock *sk)
1053 sock_lock_init_class_and_name(sk,
1054 af_family_slock_key_strings[sk->sk_family],
1055 af_family_slock_keys + sk->sk_family,
1056 af_family_key_strings[sk->sk_family],
1057 af_family_keys + sk->sk_family);
1061 * Copy all fields from osk to nsk but nsk->sk_refcnt must not change yet,
1062 * even temporarly, because of RCU lookups. sk_node should also be left as is.
1063 * We must not copy fields between sk_dontcopy_begin and sk_dontcopy_end
1065 static void sock_copy(struct sock *nsk, const struct sock *osk)
1067 #ifdef CONFIG_SECURITY_NETWORK
1068 void *sptr = nsk->sk_security;
1070 memcpy(nsk, osk, offsetof(struct sock, sk_dontcopy_begin));
1072 memcpy(&nsk->sk_dontcopy_end, &osk->sk_dontcopy_end,
1073 osk->sk_prot->obj_size - offsetof(struct sock, sk_dontcopy_end));
1075 #ifdef CONFIG_SECURITY_NETWORK
1076 nsk->sk_security = sptr;
1077 security_sk_clone(osk, nsk);
1082 * caches using SLAB_DESTROY_BY_RCU should let .next pointer from nulls nodes
1083 * un-modified. Special care is taken when initializing object to zero.
1085 static inline void sk_prot_clear_nulls(struct sock *sk, int size)
1087 if (offsetof(struct sock, sk_node.next) != 0)
1088 memset(sk, 0, offsetof(struct sock, sk_node.next));
1089 memset(&sk->sk_node.pprev, 0,
1090 size - offsetof(struct sock, sk_node.pprev));
1093 void sk_prot_clear_portaddr_nulls(struct sock *sk, int size)
1095 unsigned long nulls1, nulls2;
1097 nulls1 = offsetof(struct sock, __sk_common.skc_node.next);
1098 nulls2 = offsetof(struct sock, __sk_common.skc_portaddr_node.next);
1099 if (nulls1 > nulls2)
1100 swap(nulls1, nulls2);
1103 memset((char *)sk, 0, nulls1);
1104 memset((char *)sk + nulls1 + sizeof(void *), 0,
1105 nulls2 - nulls1 - sizeof(void *));
1106 memset((char *)sk + nulls2 + sizeof(void *), 0,
1107 size - nulls2 - sizeof(void *));
1109 EXPORT_SYMBOL(sk_prot_clear_portaddr_nulls);
1111 static struct sock *sk_prot_alloc(struct proto *prot, gfp_t priority,
1115 struct kmem_cache *slab;
1119 sk = kmem_cache_alloc(slab, priority & ~__GFP_ZERO);
1122 if (priority & __GFP_ZERO) {
1124 prot->clear_sk(sk, prot->obj_size);
1126 sk_prot_clear_nulls(sk, prot->obj_size);
1129 sk = kmalloc(prot->obj_size, priority);
1132 kmemcheck_annotate_bitfield(sk, flags);
1134 if (security_sk_alloc(sk, family, priority))
1137 if (!try_module_get(prot->owner))
1139 sk_tx_queue_clear(sk);
1145 security_sk_free(sk);
1148 kmem_cache_free(slab, sk);
1154 static void sk_prot_free(struct proto *prot, struct sock *sk)
1156 struct kmem_cache *slab;
1157 struct module *owner;
1159 owner = prot->owner;
1162 security_sk_free(sk);
1164 kmem_cache_free(slab, sk);
1170 #ifdef CONFIG_CGROUPS
1171 void sock_update_classid(struct sock *sk)
1175 rcu_read_lock(); /* doing current task, which cannot vanish. */
1176 classid = task_cls_classid(current);
1178 if (classid && classid != sk->sk_classid)
1179 sk->sk_classid = classid;
1181 EXPORT_SYMBOL(sock_update_classid);
1183 void sock_update_netprioidx(struct sock *sk, struct task_struct *task)
1188 sk->sk_cgrp_prioidx = task_netprioidx(task);
1190 EXPORT_SYMBOL_GPL(sock_update_netprioidx);
1194 * sk_alloc - All socket objects are allocated here
1195 * @net: the applicable net namespace
1196 * @family: protocol family
1197 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
1198 * @prot: struct proto associated with this new sock instance
1200 struct sock *sk_alloc(struct net *net, int family, gfp_t priority,
1205 sk = sk_prot_alloc(prot, priority | __GFP_ZERO, family);
1207 sk->sk_family = family;
1209 * See comment in struct sock definition to understand
1210 * why we need sk_prot_creator -acme
1212 sk->sk_prot = sk->sk_prot_creator = prot;
1214 sock_net_set(sk, get_net(net));
1215 atomic_set(&sk->sk_wmem_alloc, 1);
1217 sock_update_classid(sk);
1218 sock_update_netprioidx(sk, current);
1223 EXPORT_SYMBOL(sk_alloc);
1225 static void __sk_free(struct sock *sk)
1227 struct sk_filter *filter;
1229 if (sk->sk_destruct)
1230 sk->sk_destruct(sk);
1232 filter = rcu_dereference_check(sk->sk_filter,
1233 atomic_read(&sk->sk_wmem_alloc) == 0);
1235 sk_filter_uncharge(sk, filter);
1236 RCU_INIT_POINTER(sk->sk_filter, NULL);
1239 sock_disable_timestamp(sk, SK_FLAGS_TIMESTAMP);
1241 if (atomic_read(&sk->sk_omem_alloc))
1242 pr_debug("%s: optmem leakage (%d bytes) detected\n",
1243 __func__, atomic_read(&sk->sk_omem_alloc));
1245 if (sk->sk_peer_cred)
1246 put_cred(sk->sk_peer_cred);
1247 put_pid(sk->sk_peer_pid);
1248 put_net(sock_net(sk));
1249 sk_prot_free(sk->sk_prot_creator, sk);
1252 void sk_free(struct sock *sk)
1255 * We subtract one from sk_wmem_alloc and can know if
1256 * some packets are still in some tx queue.
1257 * If not null, sock_wfree() will call __sk_free(sk) later
1259 if (atomic_dec_and_test(&sk->sk_wmem_alloc))
1262 EXPORT_SYMBOL(sk_free);
1265 * Last sock_put should drop reference to sk->sk_net. It has already
1266 * been dropped in sk_change_net. Taking reference to stopping namespace
1268 * Take reference to a socket to remove it from hash _alive_ and after that
1269 * destroy it in the context of init_net.
1271 void sk_release_kernel(struct sock *sk)
1273 if (sk == NULL || sk->sk_socket == NULL)
1277 sock_release(sk->sk_socket);
1278 release_net(sock_net(sk));
1279 sock_net_set(sk, get_net(&init_net));
1282 EXPORT_SYMBOL(sk_release_kernel);
1284 static void sk_update_clone(const struct sock *sk, struct sock *newsk)
1286 if (mem_cgroup_sockets_enabled && sk->sk_cgrp)
1287 sock_update_memcg(newsk);
1291 * sk_clone_lock - clone a socket, and lock its clone
1292 * @sk: the socket to clone
1293 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
1295 * Caller must unlock socket even in error path (bh_unlock_sock(newsk))
1297 struct sock *sk_clone_lock(const struct sock *sk, const gfp_t priority)
1301 newsk = sk_prot_alloc(sk->sk_prot, priority, sk->sk_family);
1302 if (newsk != NULL) {
1303 struct sk_filter *filter;
1305 sock_copy(newsk, sk);
1308 get_net(sock_net(newsk));
1309 sk_node_init(&newsk->sk_node);
1310 sock_lock_init(newsk);
1311 bh_lock_sock(newsk);
1312 newsk->sk_backlog.head = newsk->sk_backlog.tail = NULL;
1313 newsk->sk_backlog.len = 0;
1315 atomic_set(&newsk->sk_rmem_alloc, 0);
1317 * sk_wmem_alloc set to one (see sk_free() and sock_wfree())
1319 atomic_set(&newsk->sk_wmem_alloc, 1);
1320 atomic_set(&newsk->sk_omem_alloc, 0);
1321 skb_queue_head_init(&newsk->sk_receive_queue);
1322 skb_queue_head_init(&newsk->sk_write_queue);
1323 #ifdef CONFIG_NET_DMA
1324 skb_queue_head_init(&newsk->sk_async_wait_queue);
1327 spin_lock_init(&newsk->sk_dst_lock);
1328 rwlock_init(&newsk->sk_callback_lock);
1329 lockdep_set_class_and_name(&newsk->sk_callback_lock,
1330 af_callback_keys + newsk->sk_family,
1331 af_family_clock_key_strings[newsk->sk_family]);
1333 newsk->sk_dst_cache = NULL;
1334 newsk->sk_wmem_queued = 0;
1335 newsk->sk_forward_alloc = 0;
1336 newsk->sk_send_head = NULL;
1337 newsk->sk_userlocks = sk->sk_userlocks & ~SOCK_BINDPORT_LOCK;
1339 sock_reset_flag(newsk, SOCK_DONE);
1340 skb_queue_head_init(&newsk->sk_error_queue);
1342 filter = rcu_dereference_protected(newsk->sk_filter, 1);
1344 sk_filter_charge(newsk, filter);
1346 if (unlikely(xfrm_sk_clone_policy(newsk))) {
1347 /* It is still raw copy of parent, so invalidate
1348 * destructor and make plain sk_free() */
1349 newsk->sk_destruct = NULL;
1350 bh_unlock_sock(newsk);
1357 newsk->sk_priority = 0;
1359 * Before updating sk_refcnt, we must commit prior changes to memory
1360 * (Documentation/RCU/rculist_nulls.txt for details)
1363 atomic_set(&newsk->sk_refcnt, 2);
1366 * Increment the counter in the same struct proto as the master
1367 * sock (sk_refcnt_debug_inc uses newsk->sk_prot->socks, that
1368 * is the same as sk->sk_prot->socks, as this field was copied
1371 * This _changes_ the previous behaviour, where
1372 * tcp_create_openreq_child always was incrementing the
1373 * equivalent to tcp_prot->socks (inet_sock_nr), so this have
1374 * to be taken into account in all callers. -acme
1376 sk_refcnt_debug_inc(newsk);
1377 sk_set_socket(newsk, NULL);
1378 newsk->sk_wq = NULL;
1380 sk_update_clone(sk, newsk);
1382 if (newsk->sk_prot->sockets_allocated)
1383 sk_sockets_allocated_inc(newsk);
1385 if (newsk->sk_flags & SK_FLAGS_TIMESTAMP)
1386 net_enable_timestamp();
1391 EXPORT_SYMBOL_GPL(sk_clone_lock);
1393 void sk_setup_caps(struct sock *sk, struct dst_entry *dst)
1395 __sk_dst_set(sk, dst);
1396 sk->sk_route_caps = dst->dev->features;
1397 if (sk->sk_route_caps & NETIF_F_GSO)
1398 sk->sk_route_caps |= NETIF_F_GSO_SOFTWARE;
1399 sk->sk_route_caps &= ~sk->sk_route_nocaps;
1400 if (sk_can_gso(sk)) {
1401 if (dst->header_len) {
1402 sk->sk_route_caps &= ~NETIF_F_GSO_MASK;
1404 sk->sk_route_caps |= NETIF_F_SG | NETIF_F_HW_CSUM;
1405 sk->sk_gso_max_size = dst->dev->gso_max_size;
1409 EXPORT_SYMBOL_GPL(sk_setup_caps);
1411 void __init sk_init(void)
1413 if (totalram_pages <= 4096) {
1414 sysctl_wmem_max = 32767;
1415 sysctl_rmem_max = 32767;
1416 sysctl_wmem_default = 32767;
1417 sysctl_rmem_default = 32767;
1418 } else if (totalram_pages >= 131072) {
1419 sysctl_wmem_max = 131071;
1420 sysctl_rmem_max = 131071;
1425 * Simple resource managers for sockets.
1430 * Write buffer destructor automatically called from kfree_skb.
1432 void sock_wfree(struct sk_buff *skb)
1434 struct sock *sk = skb->sk;
1435 unsigned int len = skb->truesize;
1437 if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE)) {
1439 * Keep a reference on sk_wmem_alloc, this will be released
1440 * after sk_write_space() call
1442 atomic_sub(len - 1, &sk->sk_wmem_alloc);
1443 sk->sk_write_space(sk);
1447 * if sk_wmem_alloc reaches 0, we must finish what sk_free()
1448 * could not do because of in-flight packets
1450 if (atomic_sub_and_test(len, &sk->sk_wmem_alloc))
1453 EXPORT_SYMBOL(sock_wfree);
1456 * Read buffer destructor automatically called from kfree_skb.
1458 void sock_rfree(struct sk_buff *skb)
1460 struct sock *sk = skb->sk;
1461 unsigned int len = skb->truesize;
1463 atomic_sub(len, &sk->sk_rmem_alloc);
1464 sk_mem_uncharge(sk, len);
1466 EXPORT_SYMBOL(sock_rfree);
1468 void sock_edemux(struct sk_buff *skb)
1472 EXPORT_SYMBOL(sock_edemux);
1474 int sock_i_uid(struct sock *sk)
1478 read_lock_bh(&sk->sk_callback_lock);
1479 uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : 0;
1480 read_unlock_bh(&sk->sk_callback_lock);
1483 EXPORT_SYMBOL(sock_i_uid);
1485 unsigned long sock_i_ino(struct sock *sk)
1489 read_lock_bh(&sk->sk_callback_lock);
1490 ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0;
1491 read_unlock_bh(&sk->sk_callback_lock);
1494 EXPORT_SYMBOL(sock_i_ino);
1497 * Allocate a skb from the socket's send buffer.
1499 struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force,
1502 if (force || atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
1503 struct sk_buff *skb = alloc_skb(size, priority);
1505 skb_set_owner_w(skb, sk);
1511 EXPORT_SYMBOL(sock_wmalloc);
1514 * Allocate a skb from the socket's receive buffer.
1516 struct sk_buff *sock_rmalloc(struct sock *sk, unsigned long size, int force,
1519 if (force || atomic_read(&sk->sk_rmem_alloc) < sk->sk_rcvbuf) {
1520 struct sk_buff *skb = alloc_skb(size, priority);
1522 skb_set_owner_r(skb, sk);
1530 * Allocate a memory block from the socket's option memory buffer.
1532 void *sock_kmalloc(struct sock *sk, int size, gfp_t priority)
1534 if ((unsigned int)size <= sysctl_optmem_max &&
1535 atomic_read(&sk->sk_omem_alloc) + size < sysctl_optmem_max) {
1537 /* First do the add, to avoid the race if kmalloc
1540 atomic_add(size, &sk->sk_omem_alloc);
1541 mem = kmalloc(size, priority);
1544 atomic_sub(size, &sk->sk_omem_alloc);
1548 EXPORT_SYMBOL(sock_kmalloc);
1551 * Free an option memory block.
1553 void sock_kfree_s(struct sock *sk, void *mem, int size)
1556 atomic_sub(size, &sk->sk_omem_alloc);
1558 EXPORT_SYMBOL(sock_kfree_s);
1560 /* It is almost wait_for_tcp_memory minus release_sock/lock_sock.
1561 I think, these locks should be removed for datagram sockets.
1563 static long sock_wait_for_wmem(struct sock *sk, long timeo)
1567 clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1571 if (signal_pending(current))
1573 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1574 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1575 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf)
1577 if (sk->sk_shutdown & SEND_SHUTDOWN)
1581 timeo = schedule_timeout(timeo);
1583 finish_wait(sk_sleep(sk), &wait);
1589 * Generic send/receive buffer handlers
1592 struct sk_buff *sock_alloc_send_pskb(struct sock *sk, unsigned long header_len,
1593 unsigned long data_len, int noblock,
1596 struct sk_buff *skb;
1600 int npages = (data_len + (PAGE_SIZE - 1)) >> PAGE_SHIFT;
1603 if (npages > MAX_SKB_FRAGS)
1606 gfp_mask = sk->sk_allocation;
1607 if (gfp_mask & __GFP_WAIT)
1608 gfp_mask |= __GFP_REPEAT;
1610 timeo = sock_sndtimeo(sk, noblock);
1612 err = sock_error(sk);
1617 if (sk->sk_shutdown & SEND_SHUTDOWN)
1620 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
1621 skb = alloc_skb(header_len, gfp_mask);
1625 /* No pages, we're done... */
1629 skb->truesize += data_len;
1630 skb_shinfo(skb)->nr_frags = npages;
1631 for (i = 0; i < npages; i++) {
1634 page = alloc_pages(sk->sk_allocation, 0);
1637 skb_shinfo(skb)->nr_frags = i;
1642 __skb_fill_page_desc(skb, i,
1644 (data_len >= PAGE_SIZE ?
1647 data_len -= PAGE_SIZE;
1650 /* Full success... */
1656 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1657 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1661 if (signal_pending(current))
1663 timeo = sock_wait_for_wmem(sk, timeo);
1666 skb_set_owner_w(skb, sk);
1670 err = sock_intr_errno(timeo);
1675 EXPORT_SYMBOL(sock_alloc_send_pskb);
1677 struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size,
1678 int noblock, int *errcode)
1680 return sock_alloc_send_pskb(sk, size, 0, noblock, errcode);
1682 EXPORT_SYMBOL(sock_alloc_send_skb);
1684 static void __lock_sock(struct sock *sk)
1685 __releases(&sk->sk_lock.slock)
1686 __acquires(&sk->sk_lock.slock)
1691 prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait,
1692 TASK_UNINTERRUPTIBLE);
1693 spin_unlock_bh(&sk->sk_lock.slock);
1695 spin_lock_bh(&sk->sk_lock.slock);
1696 if (!sock_owned_by_user(sk))
1699 finish_wait(&sk->sk_lock.wq, &wait);
1702 static void __release_sock(struct sock *sk)
1703 __releases(&sk->sk_lock.slock)
1704 __acquires(&sk->sk_lock.slock)
1706 struct sk_buff *skb = sk->sk_backlog.head;
1709 sk->sk_backlog.head = sk->sk_backlog.tail = NULL;
1713 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)
2163 if (sk->sk_prot->release_cb)
2164 sk->sk_prot->release_cb(sk);
2166 sk->sk_lock.owned = 0;
2167 if (waitqueue_active(&sk->sk_lock.wq))
2168 wake_up(&sk->sk_lock.wq);
2169 spin_unlock_bh(&sk->sk_lock.slock);
2171 EXPORT_SYMBOL(release_sock);
2174 * lock_sock_fast - fast version of lock_sock
2177 * This version should be used for very small section, where process wont block
2178 * return false if fast path is taken
2179 * sk_lock.slock locked, owned = 0, BH disabled
2180 * return true if slow path is taken
2181 * sk_lock.slock unlocked, owned = 1, BH enabled
2183 bool lock_sock_fast(struct sock *sk)
2186 spin_lock_bh(&sk->sk_lock.slock);
2188 if (!sk->sk_lock.owned)
2190 * Note : We must disable BH
2195 sk->sk_lock.owned = 1;
2196 spin_unlock(&sk->sk_lock.slock);
2198 * The sk_lock has mutex_lock() semantics here:
2200 mutex_acquire(&sk->sk_lock.dep_map, 0, 0, _RET_IP_);
2204 EXPORT_SYMBOL(lock_sock_fast);
2206 int sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp)
2209 if (!sock_flag(sk, SOCK_TIMESTAMP))
2210 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
2211 tv = ktime_to_timeval(sk->sk_stamp);
2212 if (tv.tv_sec == -1)
2214 if (tv.tv_sec == 0) {
2215 sk->sk_stamp = ktime_get_real();
2216 tv = ktime_to_timeval(sk->sk_stamp);
2218 return copy_to_user(userstamp, &tv, sizeof(tv)) ? -EFAULT : 0;
2220 EXPORT_SYMBOL(sock_get_timestamp);
2222 int sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp)
2225 if (!sock_flag(sk, SOCK_TIMESTAMP))
2226 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
2227 ts = ktime_to_timespec(sk->sk_stamp);
2228 if (ts.tv_sec == -1)
2230 if (ts.tv_sec == 0) {
2231 sk->sk_stamp = ktime_get_real();
2232 ts = ktime_to_timespec(sk->sk_stamp);
2234 return copy_to_user(userstamp, &ts, sizeof(ts)) ? -EFAULT : 0;
2236 EXPORT_SYMBOL(sock_get_timestampns);
2238 void sock_enable_timestamp(struct sock *sk, int flag)
2240 if (!sock_flag(sk, flag)) {
2241 unsigned long previous_flags = sk->sk_flags;
2243 sock_set_flag(sk, flag);
2245 * we just set one of the two flags which require net
2246 * time stamping, but time stamping might have been on
2247 * already because of the other one
2249 if (!(previous_flags & SK_FLAGS_TIMESTAMP))
2250 net_enable_timestamp();
2255 * Get a socket option on an socket.
2257 * FIX: POSIX 1003.1g is very ambiguous here. It states that
2258 * asynchronous errors should be reported by getsockopt. We assume
2259 * this means if you specify SO_ERROR (otherwise whats the point of it).
2261 int sock_common_getsockopt(struct socket *sock, int level, int optname,
2262 char __user *optval, int __user *optlen)
2264 struct sock *sk = sock->sk;
2266 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
2268 EXPORT_SYMBOL(sock_common_getsockopt);
2270 #ifdef CONFIG_COMPAT
2271 int compat_sock_common_getsockopt(struct socket *sock, int level, int optname,
2272 char __user *optval, int __user *optlen)
2274 struct sock *sk = sock->sk;
2276 if (sk->sk_prot->compat_getsockopt != NULL)
2277 return sk->sk_prot->compat_getsockopt(sk, level, optname,
2279 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
2281 EXPORT_SYMBOL(compat_sock_common_getsockopt);
2284 int sock_common_recvmsg(struct kiocb *iocb, struct socket *sock,
2285 struct msghdr *msg, size_t size, int flags)
2287 struct sock *sk = sock->sk;
2291 err = sk->sk_prot->recvmsg(iocb, sk, msg, size, flags & MSG_DONTWAIT,
2292 flags & ~MSG_DONTWAIT, &addr_len);
2294 msg->msg_namelen = addr_len;
2297 EXPORT_SYMBOL(sock_common_recvmsg);
2300 * Set socket options on an inet socket.
2302 int sock_common_setsockopt(struct socket *sock, int level, int optname,
2303 char __user *optval, unsigned int optlen)
2305 struct sock *sk = sock->sk;
2307 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
2309 EXPORT_SYMBOL(sock_common_setsockopt);
2311 #ifdef CONFIG_COMPAT
2312 int compat_sock_common_setsockopt(struct socket *sock, int level, int optname,
2313 char __user *optval, unsigned int optlen)
2315 struct sock *sk = sock->sk;
2317 if (sk->sk_prot->compat_setsockopt != NULL)
2318 return sk->sk_prot->compat_setsockopt(sk, level, optname,
2320 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
2322 EXPORT_SYMBOL(compat_sock_common_setsockopt);
2325 void sk_common_release(struct sock *sk)
2327 if (sk->sk_prot->destroy)
2328 sk->sk_prot->destroy(sk);
2331 * Observation: when sock_common_release is called, processes have
2332 * no access to socket. But net still has.
2333 * Step one, detach it from networking:
2335 * A. Remove from hash tables.
2338 sk->sk_prot->unhash(sk);
2341 * In this point socket cannot receive new packets, but it is possible
2342 * that some packets are in flight because some CPU runs receiver and
2343 * did hash table lookup before we unhashed socket. They will achieve
2344 * receive queue and will be purged by socket destructor.
2346 * Also we still have packets pending on receive queue and probably,
2347 * our own packets waiting in device queues. sock_destroy will drain
2348 * receive queue, but transmitted packets will delay socket destruction
2349 * until the last reference will be released.
2354 xfrm_sk_free_policy(sk);
2356 sk_refcnt_debug_release(sk);
2359 EXPORT_SYMBOL(sk_common_release);
2361 #ifdef CONFIG_PROC_FS
2362 #define PROTO_INUSE_NR 64 /* should be enough for the first time */
2364 int val[PROTO_INUSE_NR];
2367 static DECLARE_BITMAP(proto_inuse_idx, PROTO_INUSE_NR);
2369 #ifdef CONFIG_NET_NS
2370 void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
2372 __this_cpu_add(net->core.inuse->val[prot->inuse_idx], val);
2374 EXPORT_SYMBOL_GPL(sock_prot_inuse_add);
2376 int sock_prot_inuse_get(struct net *net, struct proto *prot)
2378 int cpu, idx = prot->inuse_idx;
2381 for_each_possible_cpu(cpu)
2382 res += per_cpu_ptr(net->core.inuse, cpu)->val[idx];
2384 return res >= 0 ? res : 0;
2386 EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
2388 static int __net_init sock_inuse_init_net(struct net *net)
2390 net->core.inuse = alloc_percpu(struct prot_inuse);
2391 return net->core.inuse ? 0 : -ENOMEM;
2394 static void __net_exit sock_inuse_exit_net(struct net *net)
2396 free_percpu(net->core.inuse);
2399 static struct pernet_operations net_inuse_ops = {
2400 .init = sock_inuse_init_net,
2401 .exit = sock_inuse_exit_net,
2404 static __init int net_inuse_init(void)
2406 if (register_pernet_subsys(&net_inuse_ops))
2407 panic("Cannot initialize net inuse counters");
2412 core_initcall(net_inuse_init);
2414 static DEFINE_PER_CPU(struct prot_inuse, prot_inuse);
2416 void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
2418 __this_cpu_add(prot_inuse.val[prot->inuse_idx], val);
2420 EXPORT_SYMBOL_GPL(sock_prot_inuse_add);
2422 int sock_prot_inuse_get(struct net *net, struct proto *prot)
2424 int cpu, idx = prot->inuse_idx;
2427 for_each_possible_cpu(cpu)
2428 res += per_cpu(prot_inuse, cpu).val[idx];
2430 return res >= 0 ? res : 0;
2432 EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
2435 static void assign_proto_idx(struct proto *prot)
2437 prot->inuse_idx = find_first_zero_bit(proto_inuse_idx, PROTO_INUSE_NR);
2439 if (unlikely(prot->inuse_idx == PROTO_INUSE_NR - 1)) {
2440 pr_err("PROTO_INUSE_NR exhausted\n");
2444 set_bit(prot->inuse_idx, proto_inuse_idx);
2447 static void release_proto_idx(struct proto *prot)
2449 if (prot->inuse_idx != PROTO_INUSE_NR - 1)
2450 clear_bit(prot->inuse_idx, proto_inuse_idx);
2453 static inline void assign_proto_idx(struct proto *prot)
2457 static inline void release_proto_idx(struct proto *prot)
2462 int proto_register(struct proto *prot, int alloc_slab)
2465 prot->slab = kmem_cache_create(prot->name, prot->obj_size, 0,
2466 SLAB_HWCACHE_ALIGN | prot->slab_flags,
2469 if (prot->slab == NULL) {
2470 pr_crit("%s: Can't create sock SLAB cache!\n",
2475 if (prot->rsk_prot != NULL) {
2476 prot->rsk_prot->slab_name = kasprintf(GFP_KERNEL, "request_sock_%s", prot->name);
2477 if (prot->rsk_prot->slab_name == NULL)
2478 goto out_free_sock_slab;
2480 prot->rsk_prot->slab = kmem_cache_create(prot->rsk_prot->slab_name,
2481 prot->rsk_prot->obj_size, 0,
2482 SLAB_HWCACHE_ALIGN, NULL);
2484 if (prot->rsk_prot->slab == NULL) {
2485 pr_crit("%s: Can't create request sock SLAB cache!\n",
2487 goto out_free_request_sock_slab_name;
2491 if (prot->twsk_prot != NULL) {
2492 prot->twsk_prot->twsk_slab_name = kasprintf(GFP_KERNEL, "tw_sock_%s", prot->name);
2494 if (prot->twsk_prot->twsk_slab_name == NULL)
2495 goto out_free_request_sock_slab;
2497 prot->twsk_prot->twsk_slab =
2498 kmem_cache_create(prot->twsk_prot->twsk_slab_name,
2499 prot->twsk_prot->twsk_obj_size,
2501 SLAB_HWCACHE_ALIGN |
2504 if (prot->twsk_prot->twsk_slab == NULL)
2505 goto out_free_timewait_sock_slab_name;
2509 mutex_lock(&proto_list_mutex);
2510 list_add(&prot->node, &proto_list);
2511 assign_proto_idx(prot);
2512 mutex_unlock(&proto_list_mutex);
2515 out_free_timewait_sock_slab_name:
2516 kfree(prot->twsk_prot->twsk_slab_name);
2517 out_free_request_sock_slab:
2518 if (prot->rsk_prot && prot->rsk_prot->slab) {
2519 kmem_cache_destroy(prot->rsk_prot->slab);
2520 prot->rsk_prot->slab = NULL;
2522 out_free_request_sock_slab_name:
2524 kfree(prot->rsk_prot->slab_name);
2526 kmem_cache_destroy(prot->slab);
2531 EXPORT_SYMBOL(proto_register);
2533 void proto_unregister(struct proto *prot)
2535 mutex_lock(&proto_list_mutex);
2536 release_proto_idx(prot);
2537 list_del(&prot->node);
2538 mutex_unlock(&proto_list_mutex);
2540 if (prot->slab != NULL) {
2541 kmem_cache_destroy(prot->slab);
2545 if (prot->rsk_prot != NULL && prot->rsk_prot->slab != NULL) {
2546 kmem_cache_destroy(prot->rsk_prot->slab);
2547 kfree(prot->rsk_prot->slab_name);
2548 prot->rsk_prot->slab = NULL;
2551 if (prot->twsk_prot != NULL && prot->twsk_prot->twsk_slab != NULL) {
2552 kmem_cache_destroy(prot->twsk_prot->twsk_slab);
2553 kfree(prot->twsk_prot->twsk_slab_name);
2554 prot->twsk_prot->twsk_slab = NULL;
2557 EXPORT_SYMBOL(proto_unregister);
2559 #ifdef CONFIG_PROC_FS
2560 static void *proto_seq_start(struct seq_file *seq, loff_t *pos)
2561 __acquires(proto_list_mutex)
2563 mutex_lock(&proto_list_mutex);
2564 return seq_list_start_head(&proto_list, *pos);
2567 static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2569 return seq_list_next(v, &proto_list, pos);
2572 static void proto_seq_stop(struct seq_file *seq, void *v)
2573 __releases(proto_list_mutex)
2575 mutex_unlock(&proto_list_mutex);
2578 static char proto_method_implemented(const void *method)
2580 return method == NULL ? 'n' : 'y';
2582 static long sock_prot_memory_allocated(struct proto *proto)
2584 return proto->memory_allocated != NULL ? proto_memory_allocated(proto) : -1L;
2587 static char *sock_prot_memory_pressure(struct proto *proto)
2589 return proto->memory_pressure != NULL ?
2590 proto_memory_pressure(proto) ? "yes" : "no" : "NI";
2593 static void proto_seq_printf(struct seq_file *seq, struct proto *proto)
2596 seq_printf(seq, "%-9s %4u %6d %6ld %-3s %6u %-3s %-10s "
2597 "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n",
2600 sock_prot_inuse_get(seq_file_net(seq), proto),
2601 sock_prot_memory_allocated(proto),
2602 sock_prot_memory_pressure(proto),
2604 proto->slab == NULL ? "no" : "yes",
2605 module_name(proto->owner),
2606 proto_method_implemented(proto->close),
2607 proto_method_implemented(proto->connect),
2608 proto_method_implemented(proto->disconnect),
2609 proto_method_implemented(proto->accept),
2610 proto_method_implemented(proto->ioctl),
2611 proto_method_implemented(proto->init),
2612 proto_method_implemented(proto->destroy),
2613 proto_method_implemented(proto->shutdown),
2614 proto_method_implemented(proto->setsockopt),
2615 proto_method_implemented(proto->getsockopt),
2616 proto_method_implemented(proto->sendmsg),
2617 proto_method_implemented(proto->recvmsg),
2618 proto_method_implemented(proto->sendpage),
2619 proto_method_implemented(proto->bind),
2620 proto_method_implemented(proto->backlog_rcv),
2621 proto_method_implemented(proto->hash),
2622 proto_method_implemented(proto->unhash),
2623 proto_method_implemented(proto->get_port),
2624 proto_method_implemented(proto->enter_memory_pressure));
2627 static int proto_seq_show(struct seq_file *seq, void *v)
2629 if (v == &proto_list)
2630 seq_printf(seq, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s",
2639 "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n");
2641 proto_seq_printf(seq, list_entry(v, struct proto, node));
2645 static const struct seq_operations proto_seq_ops = {
2646 .start = proto_seq_start,
2647 .next = proto_seq_next,
2648 .stop = proto_seq_stop,
2649 .show = proto_seq_show,
2652 static int proto_seq_open(struct inode *inode, struct file *file)
2654 return seq_open_net(inode, file, &proto_seq_ops,
2655 sizeof(struct seq_net_private));
2658 static const struct file_operations proto_seq_fops = {
2659 .owner = THIS_MODULE,
2660 .open = proto_seq_open,
2662 .llseek = seq_lseek,
2663 .release = seq_release_net,
2666 static __net_init int proto_init_net(struct net *net)
2668 if (!proc_net_fops_create(net, "protocols", S_IRUGO, &proto_seq_fops))
2674 static __net_exit void proto_exit_net(struct net *net)
2676 proc_net_remove(net, "protocols");
2680 static __net_initdata struct pernet_operations proto_net_ops = {
2681 .init = proto_init_net,
2682 .exit = proto_exit_net,
2685 static int __init proto_init(void)
2687 return register_pernet_subsys(&proto_net_ops);
2690 subsys_initcall(proto_init);
2692 #endif /* PROC_FS */