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>
119 #include <linux/netdevice.h>
120 #include <net/protocol.h>
121 #include <linux/skbuff.h>
122 #include <net/net_namespace.h>
123 #include <net/request_sock.h>
124 #include <net/sock.h>
125 #include <linux/net_tstamp.h>
126 #include <net/xfrm.h>
127 #include <linux/ipsec.h>
128 #include <net/cls_cgroup.h>
129 #include <net/netprio_cgroup.h>
131 #include <linux/filter.h>
133 #include <trace/events/sock.h>
139 static DEFINE_MUTEX(proto_list_mutex);
140 static LIST_HEAD(proto_list);
142 #ifdef CONFIG_CGROUP_MEM_RES_CTLR_KMEM
143 int mem_cgroup_sockets_init(struct cgroup *cgrp, struct cgroup_subsys *ss)
148 mutex_lock(&proto_list_mutex);
149 list_for_each_entry(proto, &proto_list, node) {
150 if (proto->init_cgroup) {
151 ret = proto->init_cgroup(cgrp, ss);
157 mutex_unlock(&proto_list_mutex);
160 list_for_each_entry_continue_reverse(proto, &proto_list, node)
161 if (proto->destroy_cgroup)
162 proto->destroy_cgroup(cgrp);
163 mutex_unlock(&proto_list_mutex);
167 void mem_cgroup_sockets_destroy(struct cgroup *cgrp)
171 mutex_lock(&proto_list_mutex);
172 list_for_each_entry_reverse(proto, &proto_list, node)
173 if (proto->destroy_cgroup)
174 proto->destroy_cgroup(cgrp);
175 mutex_unlock(&proto_list_mutex);
180 * Each address family might have different locking rules, so we have
181 * one slock key per address family:
183 static struct lock_class_key af_family_keys[AF_MAX];
184 static struct lock_class_key af_family_slock_keys[AF_MAX];
186 struct static_key memcg_socket_limit_enabled;
187 EXPORT_SYMBOL(memcg_socket_limit_enabled);
190 * Make lock validator output more readable. (we pre-construct these
191 * strings build-time, so that runtime initialization of socket
194 static const char *const af_family_key_strings[AF_MAX+1] = {
195 "sk_lock-AF_UNSPEC", "sk_lock-AF_UNIX" , "sk_lock-AF_INET" ,
196 "sk_lock-AF_AX25" , "sk_lock-AF_IPX" , "sk_lock-AF_APPLETALK",
197 "sk_lock-AF_NETROM", "sk_lock-AF_BRIDGE" , "sk_lock-AF_ATMPVC" ,
198 "sk_lock-AF_X25" , "sk_lock-AF_INET6" , "sk_lock-AF_ROSE" ,
199 "sk_lock-AF_DECnet", "sk_lock-AF_NETBEUI" , "sk_lock-AF_SECURITY" ,
200 "sk_lock-AF_KEY" , "sk_lock-AF_NETLINK" , "sk_lock-AF_PACKET" ,
201 "sk_lock-AF_ASH" , "sk_lock-AF_ECONET" , "sk_lock-AF_ATMSVC" ,
202 "sk_lock-AF_RDS" , "sk_lock-AF_SNA" , "sk_lock-AF_IRDA" ,
203 "sk_lock-AF_PPPOX" , "sk_lock-AF_WANPIPE" , "sk_lock-AF_LLC" ,
204 "sk_lock-27" , "sk_lock-28" , "sk_lock-AF_CAN" ,
205 "sk_lock-AF_TIPC" , "sk_lock-AF_BLUETOOTH", "sk_lock-IUCV" ,
206 "sk_lock-AF_RXRPC" , "sk_lock-AF_ISDN" , "sk_lock-AF_PHONET" ,
207 "sk_lock-AF_IEEE802154", "sk_lock-AF_CAIF" , "sk_lock-AF_ALG" ,
208 "sk_lock-AF_NFC" , "sk_lock-AF_MAX"
210 static const char *const af_family_slock_key_strings[AF_MAX+1] = {
211 "slock-AF_UNSPEC", "slock-AF_UNIX" , "slock-AF_INET" ,
212 "slock-AF_AX25" , "slock-AF_IPX" , "slock-AF_APPLETALK",
213 "slock-AF_NETROM", "slock-AF_BRIDGE" , "slock-AF_ATMPVC" ,
214 "slock-AF_X25" , "slock-AF_INET6" , "slock-AF_ROSE" ,
215 "slock-AF_DECnet", "slock-AF_NETBEUI" , "slock-AF_SECURITY" ,
216 "slock-AF_KEY" , "slock-AF_NETLINK" , "slock-AF_PACKET" ,
217 "slock-AF_ASH" , "slock-AF_ECONET" , "slock-AF_ATMSVC" ,
218 "slock-AF_RDS" , "slock-AF_SNA" , "slock-AF_IRDA" ,
219 "slock-AF_PPPOX" , "slock-AF_WANPIPE" , "slock-AF_LLC" ,
220 "slock-27" , "slock-28" , "slock-AF_CAN" ,
221 "slock-AF_TIPC" , "slock-AF_BLUETOOTH", "slock-AF_IUCV" ,
222 "slock-AF_RXRPC" , "slock-AF_ISDN" , "slock-AF_PHONET" ,
223 "slock-AF_IEEE802154", "slock-AF_CAIF" , "slock-AF_ALG" ,
224 "slock-AF_NFC" , "slock-AF_MAX"
226 static const char *const af_family_clock_key_strings[AF_MAX+1] = {
227 "clock-AF_UNSPEC", "clock-AF_UNIX" , "clock-AF_INET" ,
228 "clock-AF_AX25" , "clock-AF_IPX" , "clock-AF_APPLETALK",
229 "clock-AF_NETROM", "clock-AF_BRIDGE" , "clock-AF_ATMPVC" ,
230 "clock-AF_X25" , "clock-AF_INET6" , "clock-AF_ROSE" ,
231 "clock-AF_DECnet", "clock-AF_NETBEUI" , "clock-AF_SECURITY" ,
232 "clock-AF_KEY" , "clock-AF_NETLINK" , "clock-AF_PACKET" ,
233 "clock-AF_ASH" , "clock-AF_ECONET" , "clock-AF_ATMSVC" ,
234 "clock-AF_RDS" , "clock-AF_SNA" , "clock-AF_IRDA" ,
235 "clock-AF_PPPOX" , "clock-AF_WANPIPE" , "clock-AF_LLC" ,
236 "clock-27" , "clock-28" , "clock-AF_CAN" ,
237 "clock-AF_TIPC" , "clock-AF_BLUETOOTH", "clock-AF_IUCV" ,
238 "clock-AF_RXRPC" , "clock-AF_ISDN" , "clock-AF_PHONET" ,
239 "clock-AF_IEEE802154", "clock-AF_CAIF" , "clock-AF_ALG" ,
240 "clock-AF_NFC" , "clock-AF_MAX"
244 * sk_callback_lock locking rules are per-address-family,
245 * so split the lock classes by using a per-AF key:
247 static struct lock_class_key af_callback_keys[AF_MAX];
249 /* Take into consideration the size of the struct sk_buff overhead in the
250 * determination of these values, since that is non-constant across
251 * platforms. This makes socket queueing behavior and performance
252 * not depend upon such differences.
254 #define _SK_MEM_PACKETS 256
255 #define _SK_MEM_OVERHEAD SKB_TRUESIZE(256)
256 #define SK_WMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS)
257 #define SK_RMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS)
259 /* Run time adjustable parameters. */
260 __u32 sysctl_wmem_max __read_mostly = SK_WMEM_MAX;
261 __u32 sysctl_rmem_max __read_mostly = SK_RMEM_MAX;
262 __u32 sysctl_wmem_default __read_mostly = SK_WMEM_MAX;
263 __u32 sysctl_rmem_default __read_mostly = SK_RMEM_MAX;
265 /* Maximal space eaten by iovec or ancillary data plus some space */
266 int sysctl_optmem_max __read_mostly = sizeof(unsigned long)*(2*UIO_MAXIOV+512);
267 EXPORT_SYMBOL(sysctl_optmem_max);
269 #if defined(CONFIG_CGROUPS)
270 #if !defined(CONFIG_NET_CLS_CGROUP)
271 int net_cls_subsys_id = -1;
272 EXPORT_SYMBOL_GPL(net_cls_subsys_id);
274 #if !defined(CONFIG_NETPRIO_CGROUP)
275 int net_prio_subsys_id = -1;
276 EXPORT_SYMBOL_GPL(net_prio_subsys_id);
280 static int sock_set_timeout(long *timeo_p, char __user *optval, int optlen)
284 if (optlen < sizeof(tv))
286 if (copy_from_user(&tv, optval, sizeof(tv)))
288 if (tv.tv_usec < 0 || tv.tv_usec >= USEC_PER_SEC)
292 static int warned __read_mostly;
295 if (warned < 10 && net_ratelimit()) {
297 printk(KERN_INFO "sock_set_timeout: `%s' (pid %d) "
298 "tries to set negative timeout\n",
299 current->comm, task_pid_nr(current));
303 *timeo_p = MAX_SCHEDULE_TIMEOUT;
304 if (tv.tv_sec == 0 && tv.tv_usec == 0)
306 if (tv.tv_sec < (MAX_SCHEDULE_TIMEOUT/HZ - 1))
307 *timeo_p = tv.tv_sec*HZ + (tv.tv_usec+(1000000/HZ-1))/(1000000/HZ);
311 static void sock_warn_obsolete_bsdism(const char *name)
314 static char warncomm[TASK_COMM_LEN];
315 if (strcmp(warncomm, current->comm) && warned < 5) {
316 strcpy(warncomm, current->comm);
317 printk(KERN_WARNING "process `%s' is using obsolete "
318 "%s SO_BSDCOMPAT\n", warncomm, name);
323 #define SK_FLAGS_TIMESTAMP ((1UL << SOCK_TIMESTAMP) | (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE))
325 static void sock_disable_timestamp(struct sock *sk, unsigned long flags)
327 if (sk->sk_flags & flags) {
328 sk->sk_flags &= ~flags;
329 if (!(sk->sk_flags & SK_FLAGS_TIMESTAMP))
330 net_disable_timestamp();
335 int sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
340 struct sk_buff_head *list = &sk->sk_receive_queue;
342 if (atomic_read(&sk->sk_rmem_alloc) >= sk->sk_rcvbuf) {
343 atomic_inc(&sk->sk_drops);
344 trace_sock_rcvqueue_full(sk, skb);
348 err = sk_filter(sk, skb);
352 if (!sk_rmem_schedule(sk, skb->truesize)) {
353 atomic_inc(&sk->sk_drops);
358 skb_set_owner_r(skb, sk);
360 /* Cache the SKB length before we tack it onto the receive
361 * queue. Once it is added it no longer belongs to us and
362 * may be freed by other threads of control pulling packets
367 /* we escape from rcu protected region, make sure we dont leak
372 spin_lock_irqsave(&list->lock, flags);
373 skb->dropcount = atomic_read(&sk->sk_drops);
374 __skb_queue_tail(list, skb);
375 spin_unlock_irqrestore(&list->lock, flags);
377 if (!sock_flag(sk, SOCK_DEAD))
378 sk->sk_data_ready(sk, skb_len);
381 EXPORT_SYMBOL(sock_queue_rcv_skb);
383 int sk_receive_skb(struct sock *sk, struct sk_buff *skb, const int nested)
385 int rc = NET_RX_SUCCESS;
387 if (sk_filter(sk, skb))
388 goto discard_and_relse;
392 if (sk_rcvqueues_full(sk, skb)) {
393 atomic_inc(&sk->sk_drops);
394 goto discard_and_relse;
397 bh_lock_sock_nested(sk);
400 if (!sock_owned_by_user(sk)) {
402 * trylock + unlock semantics:
404 mutex_acquire(&sk->sk_lock.dep_map, 0, 1, _RET_IP_);
406 rc = sk_backlog_rcv(sk, skb);
408 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_);
409 } else if (sk_add_backlog(sk, skb)) {
411 atomic_inc(&sk->sk_drops);
412 goto discard_and_relse;
423 EXPORT_SYMBOL(sk_receive_skb);
425 void sk_reset_txq(struct sock *sk)
427 sk_tx_queue_clear(sk);
429 EXPORT_SYMBOL(sk_reset_txq);
431 struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie)
433 struct dst_entry *dst = __sk_dst_get(sk);
435 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
436 sk_tx_queue_clear(sk);
437 RCU_INIT_POINTER(sk->sk_dst_cache, NULL);
444 EXPORT_SYMBOL(__sk_dst_check);
446 struct dst_entry *sk_dst_check(struct sock *sk, u32 cookie)
448 struct dst_entry *dst = sk_dst_get(sk);
450 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
458 EXPORT_SYMBOL(sk_dst_check);
460 static int sock_bindtodevice(struct sock *sk, char __user *optval, int optlen)
462 int ret = -ENOPROTOOPT;
463 #ifdef CONFIG_NETDEVICES
464 struct net *net = sock_net(sk);
465 char devname[IFNAMSIZ];
470 if (!capable(CAP_NET_RAW))
477 /* Bind this socket to a particular device like "eth0",
478 * as specified in the passed interface name. If the
479 * name is "" or the option length is zero the socket
482 if (optlen > IFNAMSIZ - 1)
483 optlen = IFNAMSIZ - 1;
484 memset(devname, 0, sizeof(devname));
487 if (copy_from_user(devname, optval, optlen))
491 if (devname[0] != '\0') {
492 struct net_device *dev;
495 dev = dev_get_by_name_rcu(net, devname);
497 index = dev->ifindex;
505 sk->sk_bound_dev_if = index;
517 static inline void sock_valbool_flag(struct sock *sk, int bit, int valbool)
520 sock_set_flag(sk, bit);
522 sock_reset_flag(sk, bit);
526 * This is meant for all protocols to use and covers goings on
527 * at the socket level. Everything here is generic.
530 int sock_setsockopt(struct socket *sock, int level, int optname,
531 char __user *optval, unsigned int optlen)
533 struct sock *sk = sock->sk;
540 * Options without arguments
543 if (optname == SO_BINDTODEVICE)
544 return sock_bindtodevice(sk, optval, optlen);
546 if (optlen < sizeof(int))
549 if (get_user(val, (int __user *)optval))
552 valbool = val ? 1 : 0;
558 if (val && !capable(CAP_NET_ADMIN))
561 sock_valbool_flag(sk, SOCK_DBG, valbool);
564 sk->sk_reuse = valbool;
573 sock_valbool_flag(sk, SOCK_LOCALROUTE, valbool);
576 sock_valbool_flag(sk, SOCK_BROADCAST, valbool);
579 /* Don't error on this BSD doesn't and if you think
580 about it this is right. Otherwise apps have to
581 play 'guess the biggest size' games. RCVBUF/SNDBUF
582 are treated in BSD as hints */
584 if (val > sysctl_wmem_max)
585 val = sysctl_wmem_max;
587 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
588 if ((val * 2) < SOCK_MIN_SNDBUF)
589 sk->sk_sndbuf = SOCK_MIN_SNDBUF;
591 sk->sk_sndbuf = val * 2;
594 * Wake up sending tasks if we
597 sk->sk_write_space(sk);
601 if (!capable(CAP_NET_ADMIN)) {
608 /* Don't error on this BSD doesn't and if you think
609 about it this is right. Otherwise apps have to
610 play 'guess the biggest size' games. RCVBUF/SNDBUF
611 are treated in BSD as hints */
613 if (val > sysctl_rmem_max)
614 val = sysctl_rmem_max;
616 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
618 * We double it on the way in to account for
619 * "struct sk_buff" etc. overhead. Applications
620 * assume that the SO_RCVBUF setting they make will
621 * allow that much actual data to be received on that
624 * Applications are unaware that "struct sk_buff" and
625 * other overheads allocate from the receive buffer
626 * during socket buffer allocation.
628 * And after considering the possible alternatives,
629 * returning the value we actually used in getsockopt
630 * is the most desirable behavior.
632 if ((val * 2) < SOCK_MIN_RCVBUF)
633 sk->sk_rcvbuf = SOCK_MIN_RCVBUF;
635 sk->sk_rcvbuf = val * 2;
639 if (!capable(CAP_NET_ADMIN)) {
647 if (sk->sk_protocol == IPPROTO_TCP)
648 tcp_set_keepalive(sk, valbool);
650 sock_valbool_flag(sk, SOCK_KEEPOPEN, valbool);
654 sock_valbool_flag(sk, SOCK_URGINLINE, valbool);
658 sk->sk_no_check = valbool;
662 if ((val >= 0 && val <= 6) || capable(CAP_NET_ADMIN))
663 sk->sk_priority = val;
669 if (optlen < sizeof(ling)) {
670 ret = -EINVAL; /* 1003.1g */
673 if (copy_from_user(&ling, optval, sizeof(ling))) {
678 sock_reset_flag(sk, SOCK_LINGER);
680 #if (BITS_PER_LONG == 32)
681 if ((unsigned int)ling.l_linger >= MAX_SCHEDULE_TIMEOUT/HZ)
682 sk->sk_lingertime = MAX_SCHEDULE_TIMEOUT;
685 sk->sk_lingertime = (unsigned int)ling.l_linger * HZ;
686 sock_set_flag(sk, SOCK_LINGER);
691 sock_warn_obsolete_bsdism("setsockopt");
696 set_bit(SOCK_PASSCRED, &sock->flags);
698 clear_bit(SOCK_PASSCRED, &sock->flags);
704 if (optname == SO_TIMESTAMP)
705 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
707 sock_set_flag(sk, SOCK_RCVTSTAMPNS);
708 sock_set_flag(sk, SOCK_RCVTSTAMP);
709 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
711 sock_reset_flag(sk, SOCK_RCVTSTAMP);
712 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
716 case SO_TIMESTAMPING:
717 if (val & ~SOF_TIMESTAMPING_MASK) {
721 sock_valbool_flag(sk, SOCK_TIMESTAMPING_TX_HARDWARE,
722 val & SOF_TIMESTAMPING_TX_HARDWARE);
723 sock_valbool_flag(sk, SOCK_TIMESTAMPING_TX_SOFTWARE,
724 val & SOF_TIMESTAMPING_TX_SOFTWARE);
725 sock_valbool_flag(sk, SOCK_TIMESTAMPING_RX_HARDWARE,
726 val & SOF_TIMESTAMPING_RX_HARDWARE);
727 if (val & SOF_TIMESTAMPING_RX_SOFTWARE)
728 sock_enable_timestamp(sk,
729 SOCK_TIMESTAMPING_RX_SOFTWARE);
731 sock_disable_timestamp(sk,
732 (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE));
733 sock_valbool_flag(sk, SOCK_TIMESTAMPING_SOFTWARE,
734 val & SOF_TIMESTAMPING_SOFTWARE);
735 sock_valbool_flag(sk, SOCK_TIMESTAMPING_SYS_HARDWARE,
736 val & SOF_TIMESTAMPING_SYS_HARDWARE);
737 sock_valbool_flag(sk, SOCK_TIMESTAMPING_RAW_HARDWARE,
738 val & SOF_TIMESTAMPING_RAW_HARDWARE);
744 sk->sk_rcvlowat = val ? : 1;
748 ret = sock_set_timeout(&sk->sk_rcvtimeo, optval, optlen);
752 ret = sock_set_timeout(&sk->sk_sndtimeo, optval, optlen);
755 case SO_ATTACH_FILTER:
757 if (optlen == sizeof(struct sock_fprog)) {
758 struct sock_fprog fprog;
761 if (copy_from_user(&fprog, optval, sizeof(fprog)))
764 ret = sk_attach_filter(&fprog, sk);
768 case SO_DETACH_FILTER:
769 ret = sk_detach_filter(sk);
774 set_bit(SOCK_PASSSEC, &sock->flags);
776 clear_bit(SOCK_PASSSEC, &sock->flags);
779 if (!capable(CAP_NET_ADMIN))
785 /* We implement the SO_SNDLOWAT etc to
786 not be settable (1003.1g 5.3) */
788 sock_valbool_flag(sk, SOCK_RXQ_OVFL, valbool);
792 sock_valbool_flag(sk, SOCK_WIFI_STATUS, valbool);
796 if (sock->ops->set_peek_off)
797 sock->ops->set_peek_off(sk, val);
803 sock_valbool_flag(sk, SOCK_NOFCS, valbool);
813 EXPORT_SYMBOL(sock_setsockopt);
816 void cred_to_ucred(struct pid *pid, const struct cred *cred,
819 ucred->pid = pid_vnr(pid);
820 ucred->uid = ucred->gid = -1;
822 struct user_namespace *current_ns = current_user_ns();
824 ucred->uid = user_ns_map_uid(current_ns, cred, cred->euid);
825 ucred->gid = user_ns_map_gid(current_ns, cred, cred->egid);
828 EXPORT_SYMBOL_GPL(cred_to_ucred);
830 int sock_getsockopt(struct socket *sock, int level, int optname,
831 char __user *optval, int __user *optlen)
833 struct sock *sk = sock->sk;
841 int lv = sizeof(int);
844 if (get_user(len, optlen))
849 memset(&v, 0, sizeof(v));
853 v.val = sock_flag(sk, SOCK_DBG);
857 v.val = sock_flag(sk, SOCK_LOCALROUTE);
861 v.val = !!sock_flag(sk, SOCK_BROADCAST);
865 v.val = sk->sk_sndbuf;
869 v.val = sk->sk_rcvbuf;
873 v.val = sk->sk_reuse;
877 v.val = !!sock_flag(sk, SOCK_KEEPOPEN);
885 v.val = sk->sk_protocol;
889 v.val = sk->sk_family;
893 v.val = -sock_error(sk);
895 v.val = xchg(&sk->sk_err_soft, 0);
899 v.val = !!sock_flag(sk, SOCK_URGINLINE);
903 v.val = sk->sk_no_check;
907 v.val = sk->sk_priority;
912 v.ling.l_onoff = !!sock_flag(sk, SOCK_LINGER);
913 v.ling.l_linger = sk->sk_lingertime / HZ;
917 sock_warn_obsolete_bsdism("getsockopt");
921 v.val = sock_flag(sk, SOCK_RCVTSTAMP) &&
922 !sock_flag(sk, SOCK_RCVTSTAMPNS);
926 v.val = sock_flag(sk, SOCK_RCVTSTAMPNS);
929 case SO_TIMESTAMPING:
931 if (sock_flag(sk, SOCK_TIMESTAMPING_TX_HARDWARE))
932 v.val |= SOF_TIMESTAMPING_TX_HARDWARE;
933 if (sock_flag(sk, SOCK_TIMESTAMPING_TX_SOFTWARE))
934 v.val |= SOF_TIMESTAMPING_TX_SOFTWARE;
935 if (sock_flag(sk, SOCK_TIMESTAMPING_RX_HARDWARE))
936 v.val |= SOF_TIMESTAMPING_RX_HARDWARE;
937 if (sock_flag(sk, SOCK_TIMESTAMPING_RX_SOFTWARE))
938 v.val |= SOF_TIMESTAMPING_RX_SOFTWARE;
939 if (sock_flag(sk, SOCK_TIMESTAMPING_SOFTWARE))
940 v.val |= SOF_TIMESTAMPING_SOFTWARE;
941 if (sock_flag(sk, SOCK_TIMESTAMPING_SYS_HARDWARE))
942 v.val |= SOF_TIMESTAMPING_SYS_HARDWARE;
943 if (sock_flag(sk, SOCK_TIMESTAMPING_RAW_HARDWARE))
944 v.val |= SOF_TIMESTAMPING_RAW_HARDWARE;
948 lv = sizeof(struct timeval);
949 if (sk->sk_rcvtimeo == MAX_SCHEDULE_TIMEOUT) {
953 v.tm.tv_sec = sk->sk_rcvtimeo / HZ;
954 v.tm.tv_usec = ((sk->sk_rcvtimeo % HZ) * 1000000) / HZ;
959 lv = sizeof(struct timeval);
960 if (sk->sk_sndtimeo == MAX_SCHEDULE_TIMEOUT) {
964 v.tm.tv_sec = sk->sk_sndtimeo / HZ;
965 v.tm.tv_usec = ((sk->sk_sndtimeo % HZ) * 1000000) / HZ;
970 v.val = sk->sk_rcvlowat;
978 v.val = test_bit(SOCK_PASSCRED, &sock->flags) ? 1 : 0;
983 struct ucred peercred;
984 if (len > sizeof(peercred))
985 len = sizeof(peercred);
986 cred_to_ucred(sk->sk_peer_pid, sk->sk_peer_cred, &peercred);
987 if (copy_to_user(optval, &peercred, len))
996 if (sock->ops->getname(sock, (struct sockaddr *)address, &lv, 2))
1000 if (copy_to_user(optval, address, len))
1005 /* Dubious BSD thing... Probably nobody even uses it, but
1006 * the UNIX standard wants it for whatever reason... -DaveM
1009 v.val = sk->sk_state == TCP_LISTEN;
1013 v.val = test_bit(SOCK_PASSSEC, &sock->flags) ? 1 : 0;
1017 return security_socket_getpeersec_stream(sock, optval, optlen, len);
1020 v.val = sk->sk_mark;
1024 v.val = !!sock_flag(sk, SOCK_RXQ_OVFL);
1027 case SO_WIFI_STATUS:
1028 v.val = !!sock_flag(sk, SOCK_WIFI_STATUS);
1032 if (!sock->ops->set_peek_off)
1035 v.val = sk->sk_peek_off;
1038 v.val = !!sock_flag(sk, SOCK_NOFCS);
1041 return -ENOPROTOOPT;
1046 if (copy_to_user(optval, &v, len))
1049 if (put_user(len, optlen))
1055 * Initialize an sk_lock.
1057 * (We also register the sk_lock with the lock validator.)
1059 static inline void sock_lock_init(struct sock *sk)
1061 sock_lock_init_class_and_name(sk,
1062 af_family_slock_key_strings[sk->sk_family],
1063 af_family_slock_keys + sk->sk_family,
1064 af_family_key_strings[sk->sk_family],
1065 af_family_keys + sk->sk_family);
1069 * Copy all fields from osk to nsk but nsk->sk_refcnt must not change yet,
1070 * even temporarly, because of RCU lookups. sk_node should also be left as is.
1071 * We must not copy fields between sk_dontcopy_begin and sk_dontcopy_end
1073 static void sock_copy(struct sock *nsk, const struct sock *osk)
1075 #ifdef CONFIG_SECURITY_NETWORK
1076 void *sptr = nsk->sk_security;
1078 memcpy(nsk, osk, offsetof(struct sock, sk_dontcopy_begin));
1080 memcpy(&nsk->sk_dontcopy_end, &osk->sk_dontcopy_end,
1081 osk->sk_prot->obj_size - offsetof(struct sock, sk_dontcopy_end));
1083 #ifdef CONFIG_SECURITY_NETWORK
1084 nsk->sk_security = sptr;
1085 security_sk_clone(osk, nsk);
1090 * caches using SLAB_DESTROY_BY_RCU should let .next pointer from nulls nodes
1091 * un-modified. Special care is taken when initializing object to zero.
1093 static inline void sk_prot_clear_nulls(struct sock *sk, int size)
1095 if (offsetof(struct sock, sk_node.next) != 0)
1096 memset(sk, 0, offsetof(struct sock, sk_node.next));
1097 memset(&sk->sk_node.pprev, 0,
1098 size - offsetof(struct sock, sk_node.pprev));
1101 void sk_prot_clear_portaddr_nulls(struct sock *sk, int size)
1103 unsigned long nulls1, nulls2;
1105 nulls1 = offsetof(struct sock, __sk_common.skc_node.next);
1106 nulls2 = offsetof(struct sock, __sk_common.skc_portaddr_node.next);
1107 if (nulls1 > nulls2)
1108 swap(nulls1, nulls2);
1111 memset((char *)sk, 0, nulls1);
1112 memset((char *)sk + nulls1 + sizeof(void *), 0,
1113 nulls2 - nulls1 - sizeof(void *));
1114 memset((char *)sk + nulls2 + sizeof(void *), 0,
1115 size - nulls2 - sizeof(void *));
1117 EXPORT_SYMBOL(sk_prot_clear_portaddr_nulls);
1119 static struct sock *sk_prot_alloc(struct proto *prot, gfp_t priority,
1123 struct kmem_cache *slab;
1127 sk = kmem_cache_alloc(slab, priority & ~__GFP_ZERO);
1130 if (priority & __GFP_ZERO) {
1132 prot->clear_sk(sk, prot->obj_size);
1134 sk_prot_clear_nulls(sk, prot->obj_size);
1137 sk = kmalloc(prot->obj_size, priority);
1140 kmemcheck_annotate_bitfield(sk, flags);
1142 if (security_sk_alloc(sk, family, priority))
1145 if (!try_module_get(prot->owner))
1147 sk_tx_queue_clear(sk);
1153 security_sk_free(sk);
1156 kmem_cache_free(slab, sk);
1162 static void sk_prot_free(struct proto *prot, struct sock *sk)
1164 struct kmem_cache *slab;
1165 struct module *owner;
1167 owner = prot->owner;
1170 security_sk_free(sk);
1172 kmem_cache_free(slab, sk);
1178 #ifdef CONFIG_CGROUPS
1179 void sock_update_classid(struct sock *sk)
1183 rcu_read_lock(); /* doing current task, which cannot vanish. */
1184 classid = task_cls_classid(current);
1186 if (classid && classid != sk->sk_classid)
1187 sk->sk_classid = classid;
1189 EXPORT_SYMBOL(sock_update_classid);
1191 void sock_update_netprioidx(struct sock *sk)
1196 sk->sk_cgrp_prioidx = task_netprioidx(current);
1198 EXPORT_SYMBOL_GPL(sock_update_netprioidx);
1202 * sk_alloc - All socket objects are allocated here
1203 * @net: the applicable net namespace
1204 * @family: protocol family
1205 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
1206 * @prot: struct proto associated with this new sock instance
1208 struct sock *sk_alloc(struct net *net, int family, gfp_t priority,
1213 sk = sk_prot_alloc(prot, priority | __GFP_ZERO, family);
1215 sk->sk_family = family;
1217 * See comment in struct sock definition to understand
1218 * why we need sk_prot_creator -acme
1220 sk->sk_prot = sk->sk_prot_creator = prot;
1222 sock_net_set(sk, get_net(net));
1223 atomic_set(&sk->sk_wmem_alloc, 1);
1225 sock_update_classid(sk);
1226 sock_update_netprioidx(sk);
1231 EXPORT_SYMBOL(sk_alloc);
1233 static void __sk_free(struct sock *sk)
1235 struct sk_filter *filter;
1237 if (sk->sk_destruct)
1238 sk->sk_destruct(sk);
1240 filter = rcu_dereference_check(sk->sk_filter,
1241 atomic_read(&sk->sk_wmem_alloc) == 0);
1243 sk_filter_uncharge(sk, filter);
1244 RCU_INIT_POINTER(sk->sk_filter, NULL);
1247 sock_disable_timestamp(sk, SK_FLAGS_TIMESTAMP);
1249 if (atomic_read(&sk->sk_omem_alloc))
1250 printk(KERN_DEBUG "%s: optmem leakage (%d bytes) detected.\n",
1251 __func__, atomic_read(&sk->sk_omem_alloc));
1253 if (sk->sk_peer_cred)
1254 put_cred(sk->sk_peer_cred);
1255 put_pid(sk->sk_peer_pid);
1256 put_net(sock_net(sk));
1257 sk_prot_free(sk->sk_prot_creator, sk);
1260 void sk_free(struct sock *sk)
1263 * We subtract one from sk_wmem_alloc and can know if
1264 * some packets are still in some tx queue.
1265 * If not null, sock_wfree() will call __sk_free(sk) later
1267 if (atomic_dec_and_test(&sk->sk_wmem_alloc))
1270 EXPORT_SYMBOL(sk_free);
1273 * Last sock_put should drop reference to sk->sk_net. It has already
1274 * been dropped in sk_change_net. Taking reference to stopping namespace
1276 * Take reference to a socket to remove it from hash _alive_ and after that
1277 * destroy it in the context of init_net.
1279 void sk_release_kernel(struct sock *sk)
1281 if (sk == NULL || sk->sk_socket == NULL)
1285 sock_release(sk->sk_socket);
1286 release_net(sock_net(sk));
1287 sock_net_set(sk, get_net(&init_net));
1290 EXPORT_SYMBOL(sk_release_kernel);
1292 static void sk_update_clone(const struct sock *sk, struct sock *newsk)
1294 if (mem_cgroup_sockets_enabled && sk->sk_cgrp)
1295 sock_update_memcg(newsk);
1299 * sk_clone_lock - clone a socket, and lock its clone
1300 * @sk: the socket to clone
1301 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
1303 * Caller must unlock socket even in error path (bh_unlock_sock(newsk))
1305 struct sock *sk_clone_lock(const struct sock *sk, const gfp_t priority)
1309 newsk = sk_prot_alloc(sk->sk_prot, priority, sk->sk_family);
1310 if (newsk != NULL) {
1311 struct sk_filter *filter;
1313 sock_copy(newsk, sk);
1316 get_net(sock_net(newsk));
1317 sk_node_init(&newsk->sk_node);
1318 sock_lock_init(newsk);
1319 bh_lock_sock(newsk);
1320 newsk->sk_backlog.head = newsk->sk_backlog.tail = NULL;
1321 newsk->sk_backlog.len = 0;
1323 atomic_set(&newsk->sk_rmem_alloc, 0);
1325 * sk_wmem_alloc set to one (see sk_free() and sock_wfree())
1327 atomic_set(&newsk->sk_wmem_alloc, 1);
1328 atomic_set(&newsk->sk_omem_alloc, 0);
1329 skb_queue_head_init(&newsk->sk_receive_queue);
1330 skb_queue_head_init(&newsk->sk_write_queue);
1331 #ifdef CONFIG_NET_DMA
1332 skb_queue_head_init(&newsk->sk_async_wait_queue);
1335 spin_lock_init(&newsk->sk_dst_lock);
1336 rwlock_init(&newsk->sk_callback_lock);
1337 lockdep_set_class_and_name(&newsk->sk_callback_lock,
1338 af_callback_keys + newsk->sk_family,
1339 af_family_clock_key_strings[newsk->sk_family]);
1341 newsk->sk_dst_cache = NULL;
1342 newsk->sk_wmem_queued = 0;
1343 newsk->sk_forward_alloc = 0;
1344 newsk->sk_send_head = NULL;
1345 newsk->sk_userlocks = sk->sk_userlocks & ~SOCK_BINDPORT_LOCK;
1347 sock_reset_flag(newsk, SOCK_DONE);
1348 skb_queue_head_init(&newsk->sk_error_queue);
1350 filter = rcu_dereference_protected(newsk->sk_filter, 1);
1352 sk_filter_charge(newsk, filter);
1354 if (unlikely(xfrm_sk_clone_policy(newsk))) {
1355 /* It is still raw copy of parent, so invalidate
1356 * destructor and make plain sk_free() */
1357 newsk->sk_destruct = NULL;
1358 bh_unlock_sock(newsk);
1365 newsk->sk_priority = 0;
1367 * Before updating sk_refcnt, we must commit prior changes to memory
1368 * (Documentation/RCU/rculist_nulls.txt for details)
1371 atomic_set(&newsk->sk_refcnt, 2);
1374 * Increment the counter in the same struct proto as the master
1375 * sock (sk_refcnt_debug_inc uses newsk->sk_prot->socks, that
1376 * is the same as sk->sk_prot->socks, as this field was copied
1379 * This _changes_ the previous behaviour, where
1380 * tcp_create_openreq_child always was incrementing the
1381 * equivalent to tcp_prot->socks (inet_sock_nr), so this have
1382 * to be taken into account in all callers. -acme
1384 sk_refcnt_debug_inc(newsk);
1385 sk_set_socket(newsk, NULL);
1386 newsk->sk_wq = NULL;
1388 sk_update_clone(sk, newsk);
1390 if (newsk->sk_prot->sockets_allocated)
1391 sk_sockets_allocated_inc(newsk);
1393 if (newsk->sk_flags & SK_FLAGS_TIMESTAMP)
1394 net_enable_timestamp();
1399 EXPORT_SYMBOL_GPL(sk_clone_lock);
1401 void sk_setup_caps(struct sock *sk, struct dst_entry *dst)
1403 __sk_dst_set(sk, dst);
1404 sk->sk_route_caps = dst->dev->features;
1405 if (sk->sk_route_caps & NETIF_F_GSO)
1406 sk->sk_route_caps |= NETIF_F_GSO_SOFTWARE;
1407 sk->sk_route_caps &= ~sk->sk_route_nocaps;
1408 if (sk_can_gso(sk)) {
1409 if (dst->header_len) {
1410 sk->sk_route_caps &= ~NETIF_F_GSO_MASK;
1412 sk->sk_route_caps |= NETIF_F_SG | NETIF_F_HW_CSUM;
1413 sk->sk_gso_max_size = dst->dev->gso_max_size;
1417 EXPORT_SYMBOL_GPL(sk_setup_caps);
1419 void __init sk_init(void)
1421 if (totalram_pages <= 4096) {
1422 sysctl_wmem_max = 32767;
1423 sysctl_rmem_max = 32767;
1424 sysctl_wmem_default = 32767;
1425 sysctl_rmem_default = 32767;
1426 } else if (totalram_pages >= 131072) {
1427 sysctl_wmem_max = 131071;
1428 sysctl_rmem_max = 131071;
1433 * Simple resource managers for sockets.
1438 * Write buffer destructor automatically called from kfree_skb.
1440 void sock_wfree(struct sk_buff *skb)
1442 struct sock *sk = skb->sk;
1443 unsigned int len = skb->truesize;
1445 if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE)) {
1447 * Keep a reference on sk_wmem_alloc, this will be released
1448 * after sk_write_space() call
1450 atomic_sub(len - 1, &sk->sk_wmem_alloc);
1451 sk->sk_write_space(sk);
1455 * if sk_wmem_alloc reaches 0, we must finish what sk_free()
1456 * could not do because of in-flight packets
1458 if (atomic_sub_and_test(len, &sk->sk_wmem_alloc))
1461 EXPORT_SYMBOL(sock_wfree);
1464 * Read buffer destructor automatically called from kfree_skb.
1466 void sock_rfree(struct sk_buff *skb)
1468 struct sock *sk = skb->sk;
1469 unsigned int len = skb->truesize;
1471 atomic_sub(len, &sk->sk_rmem_alloc);
1472 sk_mem_uncharge(sk, len);
1474 EXPORT_SYMBOL(sock_rfree);
1477 int sock_i_uid(struct sock *sk)
1481 read_lock_bh(&sk->sk_callback_lock);
1482 uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : 0;
1483 read_unlock_bh(&sk->sk_callback_lock);
1486 EXPORT_SYMBOL(sock_i_uid);
1488 unsigned long sock_i_ino(struct sock *sk)
1492 read_lock_bh(&sk->sk_callback_lock);
1493 ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0;
1494 read_unlock_bh(&sk->sk_callback_lock);
1497 EXPORT_SYMBOL(sock_i_ino);
1500 * Allocate a skb from the socket's send buffer.
1502 struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force,
1505 if (force || atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
1506 struct sk_buff *skb = alloc_skb(size, priority);
1508 skb_set_owner_w(skb, sk);
1514 EXPORT_SYMBOL(sock_wmalloc);
1517 * Allocate a skb from the socket's receive buffer.
1519 struct sk_buff *sock_rmalloc(struct sock *sk, unsigned long size, int force,
1522 if (force || atomic_read(&sk->sk_rmem_alloc) < sk->sk_rcvbuf) {
1523 struct sk_buff *skb = alloc_skb(size, priority);
1525 skb_set_owner_r(skb, sk);
1533 * Allocate a memory block from the socket's option memory buffer.
1535 void *sock_kmalloc(struct sock *sk, int size, gfp_t priority)
1537 if ((unsigned int)size <= sysctl_optmem_max &&
1538 atomic_read(&sk->sk_omem_alloc) + size < sysctl_optmem_max) {
1540 /* First do the add, to avoid the race if kmalloc
1543 atomic_add(size, &sk->sk_omem_alloc);
1544 mem = kmalloc(size, priority);
1547 atomic_sub(size, &sk->sk_omem_alloc);
1551 EXPORT_SYMBOL(sock_kmalloc);
1554 * Free an option memory block.
1556 void sock_kfree_s(struct sock *sk, void *mem, int size)
1559 atomic_sub(size, &sk->sk_omem_alloc);
1561 EXPORT_SYMBOL(sock_kfree_s);
1563 /* It is almost wait_for_tcp_memory minus release_sock/lock_sock.
1564 I think, these locks should be removed for datagram sockets.
1566 static long sock_wait_for_wmem(struct sock *sk, long timeo)
1570 clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1574 if (signal_pending(current))
1576 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1577 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1578 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf)
1580 if (sk->sk_shutdown & SEND_SHUTDOWN)
1584 timeo = schedule_timeout(timeo);
1586 finish_wait(sk_sleep(sk), &wait);
1592 * Generic send/receive buffer handlers
1595 struct sk_buff *sock_alloc_send_pskb(struct sock *sk, unsigned long header_len,
1596 unsigned long data_len, int noblock,
1599 struct sk_buff *skb;
1604 gfp_mask = sk->sk_allocation;
1605 if (gfp_mask & __GFP_WAIT)
1606 gfp_mask |= __GFP_REPEAT;
1608 timeo = sock_sndtimeo(sk, noblock);
1610 err = sock_error(sk);
1615 if (sk->sk_shutdown & SEND_SHUTDOWN)
1618 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
1619 skb = alloc_skb(header_len, gfp_mask);
1624 /* No pages, we're done... */
1628 npages = (data_len + (PAGE_SIZE - 1)) >> PAGE_SHIFT;
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;
1715 WARN_ON_ONCE(skb_dst_is_noref(skb));
1717 sk_backlog_rcv(sk, skb);
1720 * We are in process context here with softirqs
1721 * disabled, use cond_resched_softirq() to preempt.
1722 * This is safe to do because we've taken the backlog
1725 cond_resched_softirq();
1728 } while (skb != NULL);
1731 } while ((skb = sk->sk_backlog.head) != NULL);
1734 * Doing the zeroing here guarantee we can not loop forever
1735 * while a wild producer attempts to flood us.
1737 sk->sk_backlog.len = 0;
1741 * sk_wait_data - wait for data to arrive at sk_receive_queue
1742 * @sk: sock to wait on
1743 * @timeo: for how long
1745 * Now socket state including sk->sk_err is changed only under lock,
1746 * hence we may omit checks after joining wait queue.
1747 * We check receive queue before schedule() only as optimization;
1748 * it is very likely that release_sock() added new data.
1750 int sk_wait_data(struct sock *sk, long *timeo)
1755 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1756 set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
1757 rc = sk_wait_event(sk, timeo, !skb_queue_empty(&sk->sk_receive_queue));
1758 clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
1759 finish_wait(sk_sleep(sk), &wait);
1762 EXPORT_SYMBOL(sk_wait_data);
1765 * __sk_mem_schedule - increase sk_forward_alloc and memory_allocated
1767 * @size: memory size to allocate
1768 * @kind: allocation type
1770 * If kind is SK_MEM_SEND, it means wmem allocation. Otherwise it means
1771 * rmem allocation. This function assumes that protocols which have
1772 * memory_pressure use sk_wmem_queued as write buffer accounting.
1774 int __sk_mem_schedule(struct sock *sk, int size, int kind)
1776 struct proto *prot = sk->sk_prot;
1777 int amt = sk_mem_pages(size);
1779 int parent_status = UNDER_LIMIT;
1781 sk->sk_forward_alloc += amt * SK_MEM_QUANTUM;
1783 allocated = sk_memory_allocated_add(sk, amt, &parent_status);
1786 if (parent_status == UNDER_LIMIT &&
1787 allocated <= sk_prot_mem_limits(sk, 0)) {
1788 sk_leave_memory_pressure(sk);
1792 /* Under pressure. (we or our parents) */
1793 if ((parent_status > SOFT_LIMIT) ||
1794 allocated > sk_prot_mem_limits(sk, 1))
1795 sk_enter_memory_pressure(sk);
1797 /* Over hard limit (we or our parents) */
1798 if ((parent_status == OVER_LIMIT) ||
1799 (allocated > sk_prot_mem_limits(sk, 2)))
1800 goto suppress_allocation;
1802 /* guarantee minimum buffer size under pressure */
1803 if (kind == SK_MEM_RECV) {
1804 if (atomic_read(&sk->sk_rmem_alloc) < prot->sysctl_rmem[0])
1807 } else { /* SK_MEM_SEND */
1808 if (sk->sk_type == SOCK_STREAM) {
1809 if (sk->sk_wmem_queued < prot->sysctl_wmem[0])
1811 } else if (atomic_read(&sk->sk_wmem_alloc) <
1812 prot->sysctl_wmem[0])
1816 if (sk_has_memory_pressure(sk)) {
1819 if (!sk_under_memory_pressure(sk))
1821 alloc = sk_sockets_allocated_read_positive(sk);
1822 if (sk_prot_mem_limits(sk, 2) > alloc *
1823 sk_mem_pages(sk->sk_wmem_queued +
1824 atomic_read(&sk->sk_rmem_alloc) +
1825 sk->sk_forward_alloc))
1829 suppress_allocation:
1831 if (kind == SK_MEM_SEND && sk->sk_type == SOCK_STREAM) {
1832 sk_stream_moderate_sndbuf(sk);
1834 /* Fail only if socket is _under_ its sndbuf.
1835 * In this case we cannot block, so that we have to fail.
1837 if (sk->sk_wmem_queued + size >= sk->sk_sndbuf)
1841 trace_sock_exceed_buf_limit(sk, prot, allocated);
1843 /* Alas. Undo changes. */
1844 sk->sk_forward_alloc -= amt * SK_MEM_QUANTUM;
1846 sk_memory_allocated_sub(sk, amt);
1850 EXPORT_SYMBOL(__sk_mem_schedule);
1853 * __sk_reclaim - reclaim memory_allocated
1856 void __sk_mem_reclaim(struct sock *sk)
1858 sk_memory_allocated_sub(sk,
1859 sk->sk_forward_alloc >> SK_MEM_QUANTUM_SHIFT);
1860 sk->sk_forward_alloc &= SK_MEM_QUANTUM - 1;
1862 if (sk_under_memory_pressure(sk) &&
1863 (sk_memory_allocated(sk) < sk_prot_mem_limits(sk, 0)))
1864 sk_leave_memory_pressure(sk);
1866 EXPORT_SYMBOL(__sk_mem_reclaim);
1870 * Set of default routines for initialising struct proto_ops when
1871 * the protocol does not support a particular function. In certain
1872 * cases where it makes no sense for a protocol to have a "do nothing"
1873 * function, some default processing is provided.
1876 int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len)
1880 EXPORT_SYMBOL(sock_no_bind);
1882 int sock_no_connect(struct socket *sock, struct sockaddr *saddr,
1887 EXPORT_SYMBOL(sock_no_connect);
1889 int sock_no_socketpair(struct socket *sock1, struct socket *sock2)
1893 EXPORT_SYMBOL(sock_no_socketpair);
1895 int sock_no_accept(struct socket *sock, struct socket *newsock, int flags)
1899 EXPORT_SYMBOL(sock_no_accept);
1901 int sock_no_getname(struct socket *sock, struct sockaddr *saddr,
1906 EXPORT_SYMBOL(sock_no_getname);
1908 unsigned int sock_no_poll(struct file *file, struct socket *sock, poll_table *pt)
1912 EXPORT_SYMBOL(sock_no_poll);
1914 int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1918 EXPORT_SYMBOL(sock_no_ioctl);
1920 int sock_no_listen(struct socket *sock, int backlog)
1924 EXPORT_SYMBOL(sock_no_listen);
1926 int sock_no_shutdown(struct socket *sock, int how)
1930 EXPORT_SYMBOL(sock_no_shutdown);
1932 int sock_no_setsockopt(struct socket *sock, int level, int optname,
1933 char __user *optval, unsigned int optlen)
1937 EXPORT_SYMBOL(sock_no_setsockopt);
1939 int sock_no_getsockopt(struct socket *sock, int level, int optname,
1940 char __user *optval, int __user *optlen)
1944 EXPORT_SYMBOL(sock_no_getsockopt);
1946 int sock_no_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
1951 EXPORT_SYMBOL(sock_no_sendmsg);
1953 int sock_no_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
1954 size_t len, int flags)
1958 EXPORT_SYMBOL(sock_no_recvmsg);
1960 int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma)
1962 /* Mirror missing mmap method error code */
1965 EXPORT_SYMBOL(sock_no_mmap);
1967 ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags)
1970 struct msghdr msg = {.msg_flags = flags};
1972 char *kaddr = kmap(page);
1973 iov.iov_base = kaddr + offset;
1975 res = kernel_sendmsg(sock, &msg, &iov, 1, size);
1979 EXPORT_SYMBOL(sock_no_sendpage);
1982 * Default Socket Callbacks
1985 static void sock_def_wakeup(struct sock *sk)
1987 struct socket_wq *wq;
1990 wq = rcu_dereference(sk->sk_wq);
1991 if (wq_has_sleeper(wq))
1992 wake_up_interruptible_all(&wq->wait);
1996 static void sock_def_error_report(struct sock *sk)
1998 struct socket_wq *wq;
2001 wq = rcu_dereference(sk->sk_wq);
2002 if (wq_has_sleeper(wq))
2003 wake_up_interruptible_poll(&wq->wait, POLLERR);
2004 sk_wake_async(sk, SOCK_WAKE_IO, POLL_ERR);
2008 static void sock_def_readable(struct sock *sk, int len)
2010 struct socket_wq *wq;
2013 wq = rcu_dereference(sk->sk_wq);
2014 if (wq_has_sleeper(wq))
2015 wake_up_interruptible_sync_poll(&wq->wait, POLLIN | POLLPRI |
2016 POLLRDNORM | POLLRDBAND);
2017 sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN);
2021 static void sock_def_write_space(struct sock *sk)
2023 struct socket_wq *wq;
2027 /* Do not wake up a writer until he can make "significant"
2030 if ((atomic_read(&sk->sk_wmem_alloc) << 1) <= sk->sk_sndbuf) {
2031 wq = rcu_dereference(sk->sk_wq);
2032 if (wq_has_sleeper(wq))
2033 wake_up_interruptible_sync_poll(&wq->wait, POLLOUT |
2034 POLLWRNORM | POLLWRBAND);
2036 /* Should agree with poll, otherwise some programs break */
2037 if (sock_writeable(sk))
2038 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
2044 static void sock_def_destruct(struct sock *sk)
2046 kfree(sk->sk_protinfo);
2049 void sk_send_sigurg(struct sock *sk)
2051 if (sk->sk_socket && sk->sk_socket->file)
2052 if (send_sigurg(&sk->sk_socket->file->f_owner))
2053 sk_wake_async(sk, SOCK_WAKE_URG, POLL_PRI);
2055 EXPORT_SYMBOL(sk_send_sigurg);
2057 void sk_reset_timer(struct sock *sk, struct timer_list* timer,
2058 unsigned long expires)
2060 if (!mod_timer(timer, expires))
2063 EXPORT_SYMBOL(sk_reset_timer);
2065 void sk_stop_timer(struct sock *sk, struct timer_list* timer)
2067 if (timer_pending(timer) && del_timer(timer))
2070 EXPORT_SYMBOL(sk_stop_timer);
2072 void sock_init_data(struct socket *sock, struct sock *sk)
2074 skb_queue_head_init(&sk->sk_receive_queue);
2075 skb_queue_head_init(&sk->sk_write_queue);
2076 skb_queue_head_init(&sk->sk_error_queue);
2077 #ifdef CONFIG_NET_DMA
2078 skb_queue_head_init(&sk->sk_async_wait_queue);
2081 sk->sk_send_head = NULL;
2083 init_timer(&sk->sk_timer);
2085 sk->sk_allocation = GFP_KERNEL;
2086 sk->sk_rcvbuf = sysctl_rmem_default;
2087 sk->sk_sndbuf = sysctl_wmem_default;
2088 sk->sk_state = TCP_CLOSE;
2089 sk_set_socket(sk, sock);
2091 sock_set_flag(sk, SOCK_ZAPPED);
2094 sk->sk_type = sock->type;
2095 sk->sk_wq = sock->wq;
2100 spin_lock_init(&sk->sk_dst_lock);
2101 rwlock_init(&sk->sk_callback_lock);
2102 lockdep_set_class_and_name(&sk->sk_callback_lock,
2103 af_callback_keys + sk->sk_family,
2104 af_family_clock_key_strings[sk->sk_family]);
2106 sk->sk_state_change = sock_def_wakeup;
2107 sk->sk_data_ready = sock_def_readable;
2108 sk->sk_write_space = sock_def_write_space;
2109 sk->sk_error_report = sock_def_error_report;
2110 sk->sk_destruct = sock_def_destruct;
2112 sk->sk_sndmsg_page = NULL;
2113 sk->sk_sndmsg_off = 0;
2114 sk->sk_peek_off = -1;
2116 sk->sk_peer_pid = NULL;
2117 sk->sk_peer_cred = NULL;
2118 sk->sk_write_pending = 0;
2119 sk->sk_rcvlowat = 1;
2120 sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT;
2121 sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT;
2123 sk->sk_stamp = ktime_set(-1L, 0);
2126 * Before updating sk_refcnt, we must commit prior changes to memory
2127 * (Documentation/RCU/rculist_nulls.txt for details)
2130 atomic_set(&sk->sk_refcnt, 1);
2131 atomic_set(&sk->sk_drops, 0);
2133 EXPORT_SYMBOL(sock_init_data);
2135 void lock_sock_nested(struct sock *sk, int subclass)
2138 spin_lock_bh(&sk->sk_lock.slock);
2139 if (sk->sk_lock.owned)
2141 sk->sk_lock.owned = 1;
2142 spin_unlock(&sk->sk_lock.slock);
2144 * The sk_lock has mutex_lock() semantics here:
2146 mutex_acquire(&sk->sk_lock.dep_map, subclass, 0, _RET_IP_);
2149 EXPORT_SYMBOL(lock_sock_nested);
2151 void release_sock(struct sock *sk)
2154 * The sk_lock has mutex_unlock() semantics:
2156 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_);
2158 spin_lock_bh(&sk->sk_lock.slock);
2159 if (sk->sk_backlog.tail)
2161 sk->sk_lock.owned = 0;
2162 if (waitqueue_active(&sk->sk_lock.wq))
2163 wake_up(&sk->sk_lock.wq);
2164 spin_unlock_bh(&sk->sk_lock.slock);
2166 EXPORT_SYMBOL(release_sock);
2169 * lock_sock_fast - fast version of lock_sock
2172 * This version should be used for very small section, where process wont block
2173 * return false if fast path is taken
2174 * sk_lock.slock locked, owned = 0, BH disabled
2175 * return true if slow path is taken
2176 * sk_lock.slock unlocked, owned = 1, BH enabled
2178 bool lock_sock_fast(struct sock *sk)
2181 spin_lock_bh(&sk->sk_lock.slock);
2183 if (!sk->sk_lock.owned)
2185 * Note : We must disable BH
2190 sk->sk_lock.owned = 1;
2191 spin_unlock(&sk->sk_lock.slock);
2193 * The sk_lock has mutex_lock() semantics here:
2195 mutex_acquire(&sk->sk_lock.dep_map, 0, 0, _RET_IP_);
2199 EXPORT_SYMBOL(lock_sock_fast);
2201 int sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp)
2204 if (!sock_flag(sk, SOCK_TIMESTAMP))
2205 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
2206 tv = ktime_to_timeval(sk->sk_stamp);
2207 if (tv.tv_sec == -1)
2209 if (tv.tv_sec == 0) {
2210 sk->sk_stamp = ktime_get_real();
2211 tv = ktime_to_timeval(sk->sk_stamp);
2213 return copy_to_user(userstamp, &tv, sizeof(tv)) ? -EFAULT : 0;
2215 EXPORT_SYMBOL(sock_get_timestamp);
2217 int sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp)
2220 if (!sock_flag(sk, SOCK_TIMESTAMP))
2221 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
2222 ts = ktime_to_timespec(sk->sk_stamp);
2223 if (ts.tv_sec == -1)
2225 if (ts.tv_sec == 0) {
2226 sk->sk_stamp = ktime_get_real();
2227 ts = ktime_to_timespec(sk->sk_stamp);
2229 return copy_to_user(userstamp, &ts, sizeof(ts)) ? -EFAULT : 0;
2231 EXPORT_SYMBOL(sock_get_timestampns);
2233 void sock_enable_timestamp(struct sock *sk, int flag)
2235 if (!sock_flag(sk, flag)) {
2236 unsigned long previous_flags = sk->sk_flags;
2238 sock_set_flag(sk, flag);
2240 * we just set one of the two flags which require net
2241 * time stamping, but time stamping might have been on
2242 * already because of the other one
2244 if (!(previous_flags & SK_FLAGS_TIMESTAMP))
2245 net_enable_timestamp();
2250 * Get a socket option on an socket.
2252 * FIX: POSIX 1003.1g is very ambiguous here. It states that
2253 * asynchronous errors should be reported by getsockopt. We assume
2254 * this means if you specify SO_ERROR (otherwise whats the point of it).
2256 int sock_common_getsockopt(struct socket *sock, int level, int optname,
2257 char __user *optval, int __user *optlen)
2259 struct sock *sk = sock->sk;
2261 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
2263 EXPORT_SYMBOL(sock_common_getsockopt);
2265 #ifdef CONFIG_COMPAT
2266 int compat_sock_common_getsockopt(struct socket *sock, int level, int optname,
2267 char __user *optval, int __user *optlen)
2269 struct sock *sk = sock->sk;
2271 if (sk->sk_prot->compat_getsockopt != NULL)
2272 return sk->sk_prot->compat_getsockopt(sk, level, optname,
2274 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
2276 EXPORT_SYMBOL(compat_sock_common_getsockopt);
2279 int sock_common_recvmsg(struct kiocb *iocb, struct socket *sock,
2280 struct msghdr *msg, size_t size, int flags)
2282 struct sock *sk = sock->sk;
2286 err = sk->sk_prot->recvmsg(iocb, sk, msg, size, flags & MSG_DONTWAIT,
2287 flags & ~MSG_DONTWAIT, &addr_len);
2289 msg->msg_namelen = addr_len;
2292 EXPORT_SYMBOL(sock_common_recvmsg);
2295 * Set socket options on an inet socket.
2297 int sock_common_setsockopt(struct socket *sock, int level, int optname,
2298 char __user *optval, unsigned int optlen)
2300 struct sock *sk = sock->sk;
2302 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
2304 EXPORT_SYMBOL(sock_common_setsockopt);
2306 #ifdef CONFIG_COMPAT
2307 int compat_sock_common_setsockopt(struct socket *sock, int level, int optname,
2308 char __user *optval, unsigned int optlen)
2310 struct sock *sk = sock->sk;
2312 if (sk->sk_prot->compat_setsockopt != NULL)
2313 return sk->sk_prot->compat_setsockopt(sk, level, optname,
2315 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
2317 EXPORT_SYMBOL(compat_sock_common_setsockopt);
2320 void sk_common_release(struct sock *sk)
2322 if (sk->sk_prot->destroy)
2323 sk->sk_prot->destroy(sk);
2326 * Observation: when sock_common_release is called, processes have
2327 * no access to socket. But net still has.
2328 * Step one, detach it from networking:
2330 * A. Remove from hash tables.
2333 sk->sk_prot->unhash(sk);
2336 * In this point socket cannot receive new packets, but it is possible
2337 * that some packets are in flight because some CPU runs receiver and
2338 * did hash table lookup before we unhashed socket. They will achieve
2339 * receive queue and will be purged by socket destructor.
2341 * Also we still have packets pending on receive queue and probably,
2342 * our own packets waiting in device queues. sock_destroy will drain
2343 * receive queue, but transmitted packets will delay socket destruction
2344 * until the last reference will be released.
2349 xfrm_sk_free_policy(sk);
2351 sk_refcnt_debug_release(sk);
2354 EXPORT_SYMBOL(sk_common_release);
2356 #ifdef CONFIG_PROC_FS
2357 #define PROTO_INUSE_NR 64 /* should be enough for the first time */
2359 int val[PROTO_INUSE_NR];
2362 static DECLARE_BITMAP(proto_inuse_idx, PROTO_INUSE_NR);
2364 #ifdef CONFIG_NET_NS
2365 void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
2367 __this_cpu_add(net->core.inuse->val[prot->inuse_idx], val);
2369 EXPORT_SYMBOL_GPL(sock_prot_inuse_add);
2371 int sock_prot_inuse_get(struct net *net, struct proto *prot)
2373 int cpu, idx = prot->inuse_idx;
2376 for_each_possible_cpu(cpu)
2377 res += per_cpu_ptr(net->core.inuse, cpu)->val[idx];
2379 return res >= 0 ? res : 0;
2381 EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
2383 static int __net_init sock_inuse_init_net(struct net *net)
2385 net->core.inuse = alloc_percpu(struct prot_inuse);
2386 return net->core.inuse ? 0 : -ENOMEM;
2389 static void __net_exit sock_inuse_exit_net(struct net *net)
2391 free_percpu(net->core.inuse);
2394 static struct pernet_operations net_inuse_ops = {
2395 .init = sock_inuse_init_net,
2396 .exit = sock_inuse_exit_net,
2399 static __init int net_inuse_init(void)
2401 if (register_pernet_subsys(&net_inuse_ops))
2402 panic("Cannot initialize net inuse counters");
2407 core_initcall(net_inuse_init);
2409 static DEFINE_PER_CPU(struct prot_inuse, prot_inuse);
2411 void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
2413 __this_cpu_add(prot_inuse.val[prot->inuse_idx], val);
2415 EXPORT_SYMBOL_GPL(sock_prot_inuse_add);
2417 int sock_prot_inuse_get(struct net *net, struct proto *prot)
2419 int cpu, idx = prot->inuse_idx;
2422 for_each_possible_cpu(cpu)
2423 res += per_cpu(prot_inuse, cpu).val[idx];
2425 return res >= 0 ? res : 0;
2427 EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
2430 static void assign_proto_idx(struct proto *prot)
2432 prot->inuse_idx = find_first_zero_bit(proto_inuse_idx, PROTO_INUSE_NR);
2434 if (unlikely(prot->inuse_idx == PROTO_INUSE_NR - 1)) {
2435 printk(KERN_ERR "PROTO_INUSE_NR exhausted\n");
2439 set_bit(prot->inuse_idx, proto_inuse_idx);
2442 static void release_proto_idx(struct proto *prot)
2444 if (prot->inuse_idx != PROTO_INUSE_NR - 1)
2445 clear_bit(prot->inuse_idx, proto_inuse_idx);
2448 static inline void assign_proto_idx(struct proto *prot)
2452 static inline void release_proto_idx(struct proto *prot)
2457 int proto_register(struct proto *prot, int alloc_slab)
2460 prot->slab = kmem_cache_create(prot->name, prot->obj_size, 0,
2461 SLAB_HWCACHE_ALIGN | prot->slab_flags,
2464 if (prot->slab == NULL) {
2465 printk(KERN_CRIT "%s: Can't create sock SLAB cache!\n",
2470 if (prot->rsk_prot != NULL) {
2471 prot->rsk_prot->slab_name = kasprintf(GFP_KERNEL, "request_sock_%s", prot->name);
2472 if (prot->rsk_prot->slab_name == NULL)
2473 goto out_free_sock_slab;
2475 prot->rsk_prot->slab = kmem_cache_create(prot->rsk_prot->slab_name,
2476 prot->rsk_prot->obj_size, 0,
2477 SLAB_HWCACHE_ALIGN, NULL);
2479 if (prot->rsk_prot->slab == NULL) {
2480 printk(KERN_CRIT "%s: Can't create request sock SLAB cache!\n",
2482 goto out_free_request_sock_slab_name;
2486 if (prot->twsk_prot != NULL) {
2487 prot->twsk_prot->twsk_slab_name = kasprintf(GFP_KERNEL, "tw_sock_%s", prot->name);
2489 if (prot->twsk_prot->twsk_slab_name == NULL)
2490 goto out_free_request_sock_slab;
2492 prot->twsk_prot->twsk_slab =
2493 kmem_cache_create(prot->twsk_prot->twsk_slab_name,
2494 prot->twsk_prot->twsk_obj_size,
2496 SLAB_HWCACHE_ALIGN |
2499 if (prot->twsk_prot->twsk_slab == NULL)
2500 goto out_free_timewait_sock_slab_name;
2504 mutex_lock(&proto_list_mutex);
2505 list_add(&prot->node, &proto_list);
2506 assign_proto_idx(prot);
2507 mutex_unlock(&proto_list_mutex);
2510 out_free_timewait_sock_slab_name:
2511 kfree(prot->twsk_prot->twsk_slab_name);
2512 out_free_request_sock_slab:
2513 if (prot->rsk_prot && prot->rsk_prot->slab) {
2514 kmem_cache_destroy(prot->rsk_prot->slab);
2515 prot->rsk_prot->slab = NULL;
2517 out_free_request_sock_slab_name:
2519 kfree(prot->rsk_prot->slab_name);
2521 kmem_cache_destroy(prot->slab);
2526 EXPORT_SYMBOL(proto_register);
2528 void proto_unregister(struct proto *prot)
2530 mutex_lock(&proto_list_mutex);
2531 release_proto_idx(prot);
2532 list_del(&prot->node);
2533 mutex_unlock(&proto_list_mutex);
2535 if (prot->slab != NULL) {
2536 kmem_cache_destroy(prot->slab);
2540 if (prot->rsk_prot != NULL && prot->rsk_prot->slab != NULL) {
2541 kmem_cache_destroy(prot->rsk_prot->slab);
2542 kfree(prot->rsk_prot->slab_name);
2543 prot->rsk_prot->slab = NULL;
2546 if (prot->twsk_prot != NULL && prot->twsk_prot->twsk_slab != NULL) {
2547 kmem_cache_destroy(prot->twsk_prot->twsk_slab);
2548 kfree(prot->twsk_prot->twsk_slab_name);
2549 prot->twsk_prot->twsk_slab = NULL;
2552 EXPORT_SYMBOL(proto_unregister);
2554 #ifdef CONFIG_PROC_FS
2555 static void *proto_seq_start(struct seq_file *seq, loff_t *pos)
2556 __acquires(proto_list_mutex)
2558 mutex_lock(&proto_list_mutex);
2559 return seq_list_start_head(&proto_list, *pos);
2562 static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2564 return seq_list_next(v, &proto_list, pos);
2567 static void proto_seq_stop(struct seq_file *seq, void *v)
2568 __releases(proto_list_mutex)
2570 mutex_unlock(&proto_list_mutex);
2573 static char proto_method_implemented(const void *method)
2575 return method == NULL ? 'n' : 'y';
2577 static long sock_prot_memory_allocated(struct proto *proto)
2579 return proto->memory_allocated != NULL ? proto_memory_allocated(proto): -1L;
2582 static char *sock_prot_memory_pressure(struct proto *proto)
2584 return proto->memory_pressure != NULL ?
2585 proto_memory_pressure(proto) ? "yes" : "no" : "NI";
2588 static void proto_seq_printf(struct seq_file *seq, struct proto *proto)
2591 seq_printf(seq, "%-9s %4u %6d %6ld %-3s %6u %-3s %-10s "
2592 "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n",
2595 sock_prot_inuse_get(seq_file_net(seq), proto),
2596 sock_prot_memory_allocated(proto),
2597 sock_prot_memory_pressure(proto),
2599 proto->slab == NULL ? "no" : "yes",
2600 module_name(proto->owner),
2601 proto_method_implemented(proto->close),
2602 proto_method_implemented(proto->connect),
2603 proto_method_implemented(proto->disconnect),
2604 proto_method_implemented(proto->accept),
2605 proto_method_implemented(proto->ioctl),
2606 proto_method_implemented(proto->init),
2607 proto_method_implemented(proto->destroy),
2608 proto_method_implemented(proto->shutdown),
2609 proto_method_implemented(proto->setsockopt),
2610 proto_method_implemented(proto->getsockopt),
2611 proto_method_implemented(proto->sendmsg),
2612 proto_method_implemented(proto->recvmsg),
2613 proto_method_implemented(proto->sendpage),
2614 proto_method_implemented(proto->bind),
2615 proto_method_implemented(proto->backlog_rcv),
2616 proto_method_implemented(proto->hash),
2617 proto_method_implemented(proto->unhash),
2618 proto_method_implemented(proto->get_port),
2619 proto_method_implemented(proto->enter_memory_pressure));
2622 static int proto_seq_show(struct seq_file *seq, void *v)
2624 if (v == &proto_list)
2625 seq_printf(seq, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s",
2634 "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n");
2636 proto_seq_printf(seq, list_entry(v, struct proto, node));
2640 static const struct seq_operations proto_seq_ops = {
2641 .start = proto_seq_start,
2642 .next = proto_seq_next,
2643 .stop = proto_seq_stop,
2644 .show = proto_seq_show,
2647 static int proto_seq_open(struct inode *inode, struct file *file)
2649 return seq_open_net(inode, file, &proto_seq_ops,
2650 sizeof(struct seq_net_private));
2653 static const struct file_operations proto_seq_fops = {
2654 .owner = THIS_MODULE,
2655 .open = proto_seq_open,
2657 .llseek = seq_lseek,
2658 .release = seq_release_net,
2661 static __net_init int proto_init_net(struct net *net)
2663 if (!proc_net_fops_create(net, "protocols", S_IRUGO, &proto_seq_fops))
2669 static __net_exit void proto_exit_net(struct net *net)
2671 proc_net_remove(net, "protocols");
2675 static __net_initdata struct pernet_operations proto_net_ops = {
2676 .init = proto_init_net,
2677 .exit = proto_exit_net,
2680 static int __init proto_init(void)
2682 return register_pernet_subsys(&proto_net_ops);
2685 subsys_initcall(proto_init);
2687 #endif /* PROC_FS */