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/jump_label.h>
116 #include <asm/uaccess.h>
117 #include <asm/system.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, ss);
163 mutex_unlock(&proto_list_mutex);
167 void mem_cgroup_sockets_destroy(struct cgroup *cgrp, struct cgroup_subsys *ss)
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, ss);
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 jump_label_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);
802 EXPORT_SYMBOL(sock_setsockopt);
805 void cred_to_ucred(struct pid *pid, const struct cred *cred,
808 ucred->pid = pid_vnr(pid);
809 ucred->uid = ucred->gid = -1;
811 struct user_namespace *current_ns = current_user_ns();
813 ucred->uid = user_ns_map_uid(current_ns, cred, cred->euid);
814 ucred->gid = user_ns_map_gid(current_ns, cred, cred->egid);
817 EXPORT_SYMBOL_GPL(cred_to_ucred);
819 int sock_getsockopt(struct socket *sock, int level, int optname,
820 char __user *optval, int __user *optlen)
822 struct sock *sk = sock->sk;
830 int lv = sizeof(int);
833 if (get_user(len, optlen))
838 memset(&v, 0, sizeof(v));
842 v.val = sock_flag(sk, SOCK_DBG);
846 v.val = sock_flag(sk, SOCK_LOCALROUTE);
850 v.val = !!sock_flag(sk, SOCK_BROADCAST);
854 v.val = sk->sk_sndbuf;
858 v.val = sk->sk_rcvbuf;
862 v.val = sk->sk_reuse;
866 v.val = !!sock_flag(sk, SOCK_KEEPOPEN);
874 v.val = sk->sk_protocol;
878 v.val = sk->sk_family;
882 v.val = -sock_error(sk);
884 v.val = xchg(&sk->sk_err_soft, 0);
888 v.val = !!sock_flag(sk, SOCK_URGINLINE);
892 v.val = sk->sk_no_check;
896 v.val = sk->sk_priority;
901 v.ling.l_onoff = !!sock_flag(sk, SOCK_LINGER);
902 v.ling.l_linger = sk->sk_lingertime / HZ;
906 sock_warn_obsolete_bsdism("getsockopt");
910 v.val = sock_flag(sk, SOCK_RCVTSTAMP) &&
911 !sock_flag(sk, SOCK_RCVTSTAMPNS);
915 v.val = sock_flag(sk, SOCK_RCVTSTAMPNS);
918 case SO_TIMESTAMPING:
920 if (sock_flag(sk, SOCK_TIMESTAMPING_TX_HARDWARE))
921 v.val |= SOF_TIMESTAMPING_TX_HARDWARE;
922 if (sock_flag(sk, SOCK_TIMESTAMPING_TX_SOFTWARE))
923 v.val |= SOF_TIMESTAMPING_TX_SOFTWARE;
924 if (sock_flag(sk, SOCK_TIMESTAMPING_RX_HARDWARE))
925 v.val |= SOF_TIMESTAMPING_RX_HARDWARE;
926 if (sock_flag(sk, SOCK_TIMESTAMPING_RX_SOFTWARE))
927 v.val |= SOF_TIMESTAMPING_RX_SOFTWARE;
928 if (sock_flag(sk, SOCK_TIMESTAMPING_SOFTWARE))
929 v.val |= SOF_TIMESTAMPING_SOFTWARE;
930 if (sock_flag(sk, SOCK_TIMESTAMPING_SYS_HARDWARE))
931 v.val |= SOF_TIMESTAMPING_SYS_HARDWARE;
932 if (sock_flag(sk, SOCK_TIMESTAMPING_RAW_HARDWARE))
933 v.val |= SOF_TIMESTAMPING_RAW_HARDWARE;
937 lv = sizeof(struct timeval);
938 if (sk->sk_rcvtimeo == MAX_SCHEDULE_TIMEOUT) {
942 v.tm.tv_sec = sk->sk_rcvtimeo / HZ;
943 v.tm.tv_usec = ((sk->sk_rcvtimeo % HZ) * 1000000) / HZ;
948 lv = sizeof(struct timeval);
949 if (sk->sk_sndtimeo == MAX_SCHEDULE_TIMEOUT) {
953 v.tm.tv_sec = sk->sk_sndtimeo / HZ;
954 v.tm.tv_usec = ((sk->sk_sndtimeo % HZ) * 1000000) / HZ;
959 v.val = sk->sk_rcvlowat;
967 v.val = test_bit(SOCK_PASSCRED, &sock->flags) ? 1 : 0;
972 struct ucred peercred;
973 if (len > sizeof(peercred))
974 len = sizeof(peercred);
975 cred_to_ucred(sk->sk_peer_pid, sk->sk_peer_cred, &peercred);
976 if (copy_to_user(optval, &peercred, len))
985 if (sock->ops->getname(sock, (struct sockaddr *)address, &lv, 2))
989 if (copy_to_user(optval, address, len))
994 /* Dubious BSD thing... Probably nobody even uses it, but
995 * the UNIX standard wants it for whatever reason... -DaveM
998 v.val = sk->sk_state == TCP_LISTEN;
1002 v.val = test_bit(SOCK_PASSSEC, &sock->flags) ? 1 : 0;
1006 return security_socket_getpeersec_stream(sock, optval, optlen, len);
1009 v.val = sk->sk_mark;
1013 v.val = !!sock_flag(sk, SOCK_RXQ_OVFL);
1016 case SO_WIFI_STATUS:
1017 v.val = !!sock_flag(sk, SOCK_WIFI_STATUS);
1021 return -ENOPROTOOPT;
1026 if (copy_to_user(optval, &v, len))
1029 if (put_user(len, optlen))
1035 * Initialize an sk_lock.
1037 * (We also register the sk_lock with the lock validator.)
1039 static inline void sock_lock_init(struct sock *sk)
1041 sock_lock_init_class_and_name(sk,
1042 af_family_slock_key_strings[sk->sk_family],
1043 af_family_slock_keys + sk->sk_family,
1044 af_family_key_strings[sk->sk_family],
1045 af_family_keys + sk->sk_family);
1049 * Copy all fields from osk to nsk but nsk->sk_refcnt must not change yet,
1050 * even temporarly, because of RCU lookups. sk_node should also be left as is.
1051 * We must not copy fields between sk_dontcopy_begin and sk_dontcopy_end
1053 static void sock_copy(struct sock *nsk, const struct sock *osk)
1055 #ifdef CONFIG_SECURITY_NETWORK
1056 void *sptr = nsk->sk_security;
1058 memcpy(nsk, osk, offsetof(struct sock, sk_dontcopy_begin));
1060 memcpy(&nsk->sk_dontcopy_end, &osk->sk_dontcopy_end,
1061 osk->sk_prot->obj_size - offsetof(struct sock, sk_dontcopy_end));
1063 #ifdef CONFIG_SECURITY_NETWORK
1064 nsk->sk_security = sptr;
1065 security_sk_clone(osk, nsk);
1070 * caches using SLAB_DESTROY_BY_RCU should let .next pointer from nulls nodes
1071 * un-modified. Special care is taken when initializing object to zero.
1073 static inline void sk_prot_clear_nulls(struct sock *sk, int size)
1075 if (offsetof(struct sock, sk_node.next) != 0)
1076 memset(sk, 0, offsetof(struct sock, sk_node.next));
1077 memset(&sk->sk_node.pprev, 0,
1078 size - offsetof(struct sock, sk_node.pprev));
1081 void sk_prot_clear_portaddr_nulls(struct sock *sk, int size)
1083 unsigned long nulls1, nulls2;
1085 nulls1 = offsetof(struct sock, __sk_common.skc_node.next);
1086 nulls2 = offsetof(struct sock, __sk_common.skc_portaddr_node.next);
1087 if (nulls1 > nulls2)
1088 swap(nulls1, nulls2);
1091 memset((char *)sk, 0, nulls1);
1092 memset((char *)sk + nulls1 + sizeof(void *), 0,
1093 nulls2 - nulls1 - sizeof(void *));
1094 memset((char *)sk + nulls2 + sizeof(void *), 0,
1095 size - nulls2 - sizeof(void *));
1097 EXPORT_SYMBOL(sk_prot_clear_portaddr_nulls);
1099 static struct sock *sk_prot_alloc(struct proto *prot, gfp_t priority,
1103 struct kmem_cache *slab;
1107 sk = kmem_cache_alloc(slab, priority & ~__GFP_ZERO);
1110 if (priority & __GFP_ZERO) {
1112 prot->clear_sk(sk, prot->obj_size);
1114 sk_prot_clear_nulls(sk, prot->obj_size);
1117 sk = kmalloc(prot->obj_size, priority);
1120 kmemcheck_annotate_bitfield(sk, flags);
1122 if (security_sk_alloc(sk, family, priority))
1125 if (!try_module_get(prot->owner))
1127 sk_tx_queue_clear(sk);
1133 security_sk_free(sk);
1136 kmem_cache_free(slab, sk);
1142 static void sk_prot_free(struct proto *prot, struct sock *sk)
1144 struct kmem_cache *slab;
1145 struct module *owner;
1147 owner = prot->owner;
1150 security_sk_free(sk);
1152 kmem_cache_free(slab, sk);
1158 #ifdef CONFIG_CGROUPS
1159 void sock_update_classid(struct sock *sk)
1163 rcu_read_lock(); /* doing current task, which cannot vanish. */
1164 classid = task_cls_classid(current);
1166 if (classid && classid != sk->sk_classid)
1167 sk->sk_classid = classid;
1169 EXPORT_SYMBOL(sock_update_classid);
1171 void sock_update_netprioidx(struct sock *sk)
1173 struct cgroup_netprio_state *state;
1177 state = task_netprio_state(current);
1178 sk->sk_cgrp_prioidx = state ? state->prioidx : 0;
1181 EXPORT_SYMBOL_GPL(sock_update_netprioidx);
1185 * sk_alloc - All socket objects are allocated here
1186 * @net: the applicable net namespace
1187 * @family: protocol family
1188 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
1189 * @prot: struct proto associated with this new sock instance
1191 struct sock *sk_alloc(struct net *net, int family, gfp_t priority,
1196 sk = sk_prot_alloc(prot, priority | __GFP_ZERO, family);
1198 sk->sk_family = family;
1200 * See comment in struct sock definition to understand
1201 * why we need sk_prot_creator -acme
1203 sk->sk_prot = sk->sk_prot_creator = prot;
1205 sock_net_set(sk, get_net(net));
1206 atomic_set(&sk->sk_wmem_alloc, 1);
1208 sock_update_classid(sk);
1209 sock_update_netprioidx(sk);
1214 EXPORT_SYMBOL(sk_alloc);
1216 static void __sk_free(struct sock *sk)
1218 struct sk_filter *filter;
1220 if (sk->sk_destruct)
1221 sk->sk_destruct(sk);
1223 filter = rcu_dereference_check(sk->sk_filter,
1224 atomic_read(&sk->sk_wmem_alloc) == 0);
1226 sk_filter_uncharge(sk, filter);
1227 RCU_INIT_POINTER(sk->sk_filter, NULL);
1230 sock_disable_timestamp(sk, SK_FLAGS_TIMESTAMP);
1232 if (atomic_read(&sk->sk_omem_alloc))
1233 printk(KERN_DEBUG "%s: optmem leakage (%d bytes) detected.\n",
1234 __func__, atomic_read(&sk->sk_omem_alloc));
1236 if (sk->sk_peer_cred)
1237 put_cred(sk->sk_peer_cred);
1238 put_pid(sk->sk_peer_pid);
1239 put_net(sock_net(sk));
1240 sk_prot_free(sk->sk_prot_creator, sk);
1243 void sk_free(struct sock *sk)
1246 * We subtract one from sk_wmem_alloc and can know if
1247 * some packets are still in some tx queue.
1248 * If not null, sock_wfree() will call __sk_free(sk) later
1250 if (atomic_dec_and_test(&sk->sk_wmem_alloc))
1253 EXPORT_SYMBOL(sk_free);
1256 * Last sock_put should drop reference to sk->sk_net. It has already
1257 * been dropped in sk_change_net. Taking reference to stopping namespace
1259 * Take reference to a socket to remove it from hash _alive_ and after that
1260 * destroy it in the context of init_net.
1262 void sk_release_kernel(struct sock *sk)
1264 if (sk == NULL || sk->sk_socket == NULL)
1268 sock_release(sk->sk_socket);
1269 release_net(sock_net(sk));
1270 sock_net_set(sk, get_net(&init_net));
1273 EXPORT_SYMBOL(sk_release_kernel);
1276 * sk_clone_lock - clone a socket, and lock its clone
1277 * @sk: the socket to clone
1278 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
1280 * Caller must unlock socket even in error path (bh_unlock_sock(newsk))
1282 struct sock *sk_clone_lock(const struct sock *sk, const gfp_t priority)
1286 newsk = sk_prot_alloc(sk->sk_prot, priority, sk->sk_family);
1287 if (newsk != NULL) {
1288 struct sk_filter *filter;
1290 sock_copy(newsk, sk);
1293 get_net(sock_net(newsk));
1294 sk_node_init(&newsk->sk_node);
1295 sock_lock_init(newsk);
1296 bh_lock_sock(newsk);
1297 newsk->sk_backlog.head = newsk->sk_backlog.tail = NULL;
1298 newsk->sk_backlog.len = 0;
1300 atomic_set(&newsk->sk_rmem_alloc, 0);
1302 * sk_wmem_alloc set to one (see sk_free() and sock_wfree())
1304 atomic_set(&newsk->sk_wmem_alloc, 1);
1305 atomic_set(&newsk->sk_omem_alloc, 0);
1306 skb_queue_head_init(&newsk->sk_receive_queue);
1307 skb_queue_head_init(&newsk->sk_write_queue);
1308 #ifdef CONFIG_NET_DMA
1309 skb_queue_head_init(&newsk->sk_async_wait_queue);
1312 spin_lock_init(&newsk->sk_dst_lock);
1313 rwlock_init(&newsk->sk_callback_lock);
1314 lockdep_set_class_and_name(&newsk->sk_callback_lock,
1315 af_callback_keys + newsk->sk_family,
1316 af_family_clock_key_strings[newsk->sk_family]);
1318 newsk->sk_dst_cache = NULL;
1319 newsk->sk_wmem_queued = 0;
1320 newsk->sk_forward_alloc = 0;
1321 newsk->sk_send_head = NULL;
1322 newsk->sk_userlocks = sk->sk_userlocks & ~SOCK_BINDPORT_LOCK;
1324 sock_reset_flag(newsk, SOCK_DONE);
1325 skb_queue_head_init(&newsk->sk_error_queue);
1327 filter = rcu_dereference_protected(newsk->sk_filter, 1);
1329 sk_filter_charge(newsk, filter);
1331 if (unlikely(xfrm_sk_clone_policy(newsk))) {
1332 /* It is still raw copy of parent, so invalidate
1333 * destructor and make plain sk_free() */
1334 newsk->sk_destruct = NULL;
1335 bh_unlock_sock(newsk);
1342 newsk->sk_priority = 0;
1344 * Before updating sk_refcnt, we must commit prior changes to memory
1345 * (Documentation/RCU/rculist_nulls.txt for details)
1348 atomic_set(&newsk->sk_refcnt, 2);
1351 * Increment the counter in the same struct proto as the master
1352 * sock (sk_refcnt_debug_inc uses newsk->sk_prot->socks, that
1353 * is the same as sk->sk_prot->socks, as this field was copied
1356 * This _changes_ the previous behaviour, where
1357 * tcp_create_openreq_child always was incrementing the
1358 * equivalent to tcp_prot->socks (inet_sock_nr), so this have
1359 * to be taken into account in all callers. -acme
1361 sk_refcnt_debug_inc(newsk);
1362 sk_set_socket(newsk, NULL);
1363 newsk->sk_wq = NULL;
1365 if (newsk->sk_prot->sockets_allocated)
1366 sk_sockets_allocated_inc(newsk);
1368 if (newsk->sk_flags & SK_FLAGS_TIMESTAMP)
1369 net_enable_timestamp();
1374 EXPORT_SYMBOL_GPL(sk_clone_lock);
1376 void sk_setup_caps(struct sock *sk, struct dst_entry *dst)
1378 __sk_dst_set(sk, dst);
1379 sk->sk_route_caps = dst->dev->features;
1380 if (sk->sk_route_caps & NETIF_F_GSO)
1381 sk->sk_route_caps |= NETIF_F_GSO_SOFTWARE;
1382 sk->sk_route_caps &= ~sk->sk_route_nocaps;
1383 if (sk_can_gso(sk)) {
1384 if (dst->header_len) {
1385 sk->sk_route_caps &= ~NETIF_F_GSO_MASK;
1387 sk->sk_route_caps |= NETIF_F_SG | NETIF_F_HW_CSUM;
1388 sk->sk_gso_max_size = dst->dev->gso_max_size;
1392 EXPORT_SYMBOL_GPL(sk_setup_caps);
1394 void __init sk_init(void)
1396 if (totalram_pages <= 4096) {
1397 sysctl_wmem_max = 32767;
1398 sysctl_rmem_max = 32767;
1399 sysctl_wmem_default = 32767;
1400 sysctl_rmem_default = 32767;
1401 } else if (totalram_pages >= 131072) {
1402 sysctl_wmem_max = 131071;
1403 sysctl_rmem_max = 131071;
1408 * Simple resource managers for sockets.
1413 * Write buffer destructor automatically called from kfree_skb.
1415 void sock_wfree(struct sk_buff *skb)
1417 struct sock *sk = skb->sk;
1418 unsigned int len = skb->truesize;
1420 if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE)) {
1422 * Keep a reference on sk_wmem_alloc, this will be released
1423 * after sk_write_space() call
1425 atomic_sub(len - 1, &sk->sk_wmem_alloc);
1426 sk->sk_write_space(sk);
1430 * if sk_wmem_alloc reaches 0, we must finish what sk_free()
1431 * could not do because of in-flight packets
1433 if (atomic_sub_and_test(len, &sk->sk_wmem_alloc))
1436 EXPORT_SYMBOL(sock_wfree);
1439 * Read buffer destructor automatically called from kfree_skb.
1441 void sock_rfree(struct sk_buff *skb)
1443 struct sock *sk = skb->sk;
1444 unsigned int len = skb->truesize;
1446 atomic_sub(len, &sk->sk_rmem_alloc);
1447 sk_mem_uncharge(sk, len);
1449 EXPORT_SYMBOL(sock_rfree);
1452 int sock_i_uid(struct sock *sk)
1456 read_lock_bh(&sk->sk_callback_lock);
1457 uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : 0;
1458 read_unlock_bh(&sk->sk_callback_lock);
1461 EXPORT_SYMBOL(sock_i_uid);
1463 unsigned long sock_i_ino(struct sock *sk)
1467 read_lock_bh(&sk->sk_callback_lock);
1468 ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0;
1469 read_unlock_bh(&sk->sk_callback_lock);
1472 EXPORT_SYMBOL(sock_i_ino);
1475 * Allocate a skb from the socket's send buffer.
1477 struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force,
1480 if (force || atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
1481 struct sk_buff *skb = alloc_skb(size, priority);
1483 skb_set_owner_w(skb, sk);
1489 EXPORT_SYMBOL(sock_wmalloc);
1492 * Allocate a skb from the socket's receive buffer.
1494 struct sk_buff *sock_rmalloc(struct sock *sk, unsigned long size, int force,
1497 if (force || atomic_read(&sk->sk_rmem_alloc) < sk->sk_rcvbuf) {
1498 struct sk_buff *skb = alloc_skb(size, priority);
1500 skb_set_owner_r(skb, sk);
1508 * Allocate a memory block from the socket's option memory buffer.
1510 void *sock_kmalloc(struct sock *sk, int size, gfp_t priority)
1512 if ((unsigned)size <= sysctl_optmem_max &&
1513 atomic_read(&sk->sk_omem_alloc) + size < sysctl_optmem_max) {
1515 /* First do the add, to avoid the race if kmalloc
1518 atomic_add(size, &sk->sk_omem_alloc);
1519 mem = kmalloc(size, priority);
1522 atomic_sub(size, &sk->sk_omem_alloc);
1526 EXPORT_SYMBOL(sock_kmalloc);
1529 * Free an option memory block.
1531 void sock_kfree_s(struct sock *sk, void *mem, int size)
1534 atomic_sub(size, &sk->sk_omem_alloc);
1536 EXPORT_SYMBOL(sock_kfree_s);
1538 /* It is almost wait_for_tcp_memory minus release_sock/lock_sock.
1539 I think, these locks should be removed for datagram sockets.
1541 static long sock_wait_for_wmem(struct sock *sk, long timeo)
1545 clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1549 if (signal_pending(current))
1551 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1552 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1553 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf)
1555 if (sk->sk_shutdown & SEND_SHUTDOWN)
1559 timeo = schedule_timeout(timeo);
1561 finish_wait(sk_sleep(sk), &wait);
1567 * Generic send/receive buffer handlers
1570 struct sk_buff *sock_alloc_send_pskb(struct sock *sk, unsigned long header_len,
1571 unsigned long data_len, int noblock,
1574 struct sk_buff *skb;
1579 gfp_mask = sk->sk_allocation;
1580 if (gfp_mask & __GFP_WAIT)
1581 gfp_mask |= __GFP_REPEAT;
1583 timeo = sock_sndtimeo(sk, noblock);
1585 err = sock_error(sk);
1590 if (sk->sk_shutdown & SEND_SHUTDOWN)
1593 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
1594 skb = alloc_skb(header_len, gfp_mask);
1599 /* No pages, we're done... */
1603 npages = (data_len + (PAGE_SIZE - 1)) >> PAGE_SHIFT;
1604 skb->truesize += data_len;
1605 skb_shinfo(skb)->nr_frags = npages;
1606 for (i = 0; i < npages; i++) {
1609 page = alloc_pages(sk->sk_allocation, 0);
1612 skb_shinfo(skb)->nr_frags = i;
1617 __skb_fill_page_desc(skb, i,
1619 (data_len >= PAGE_SIZE ?
1622 data_len -= PAGE_SIZE;
1625 /* Full success... */
1631 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1632 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1636 if (signal_pending(current))
1638 timeo = sock_wait_for_wmem(sk, timeo);
1641 skb_set_owner_w(skb, sk);
1645 err = sock_intr_errno(timeo);
1650 EXPORT_SYMBOL(sock_alloc_send_pskb);
1652 struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size,
1653 int noblock, int *errcode)
1655 return sock_alloc_send_pskb(sk, size, 0, noblock, errcode);
1657 EXPORT_SYMBOL(sock_alloc_send_skb);
1659 static void __lock_sock(struct sock *sk)
1660 __releases(&sk->sk_lock.slock)
1661 __acquires(&sk->sk_lock.slock)
1666 prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait,
1667 TASK_UNINTERRUPTIBLE);
1668 spin_unlock_bh(&sk->sk_lock.slock);
1670 spin_lock_bh(&sk->sk_lock.slock);
1671 if (!sock_owned_by_user(sk))
1674 finish_wait(&sk->sk_lock.wq, &wait);
1677 static void __release_sock(struct sock *sk)
1678 __releases(&sk->sk_lock.slock)
1679 __acquires(&sk->sk_lock.slock)
1681 struct sk_buff *skb = sk->sk_backlog.head;
1684 sk->sk_backlog.head = sk->sk_backlog.tail = NULL;
1688 struct sk_buff *next = skb->next;
1690 WARN_ON_ONCE(skb_dst_is_noref(skb));
1692 sk_backlog_rcv(sk, skb);
1695 * We are in process context here with softirqs
1696 * disabled, use cond_resched_softirq() to preempt.
1697 * This is safe to do because we've taken the backlog
1700 cond_resched_softirq();
1703 } while (skb != NULL);
1706 } while ((skb = sk->sk_backlog.head) != NULL);
1709 * Doing the zeroing here guarantee we can not loop forever
1710 * while a wild producer attempts to flood us.
1712 sk->sk_backlog.len = 0;
1716 * sk_wait_data - wait for data to arrive at sk_receive_queue
1717 * @sk: sock to wait on
1718 * @timeo: for how long
1720 * Now socket state including sk->sk_err is changed only under lock,
1721 * hence we may omit checks after joining wait queue.
1722 * We check receive queue before schedule() only as optimization;
1723 * it is very likely that release_sock() added new data.
1725 int sk_wait_data(struct sock *sk, long *timeo)
1730 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1731 set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
1732 rc = sk_wait_event(sk, timeo, !skb_queue_empty(&sk->sk_receive_queue));
1733 clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
1734 finish_wait(sk_sleep(sk), &wait);
1737 EXPORT_SYMBOL(sk_wait_data);
1740 * __sk_mem_schedule - increase sk_forward_alloc and memory_allocated
1742 * @size: memory size to allocate
1743 * @kind: allocation type
1745 * If kind is SK_MEM_SEND, it means wmem allocation. Otherwise it means
1746 * rmem allocation. This function assumes that protocols which have
1747 * memory_pressure use sk_wmem_queued as write buffer accounting.
1749 int __sk_mem_schedule(struct sock *sk, int size, int kind)
1751 struct proto *prot = sk->sk_prot;
1752 int amt = sk_mem_pages(size);
1754 int parent_status = UNDER_LIMIT;
1756 sk->sk_forward_alloc += amt * SK_MEM_QUANTUM;
1758 allocated = sk_memory_allocated_add(sk, amt, &parent_status);
1761 if (parent_status == UNDER_LIMIT &&
1762 allocated <= sk_prot_mem_limits(sk, 0)) {
1763 sk_leave_memory_pressure(sk);
1767 /* Under pressure. (we or our parents) */
1768 if ((parent_status > SOFT_LIMIT) ||
1769 allocated > sk_prot_mem_limits(sk, 1))
1770 sk_enter_memory_pressure(sk);
1772 /* Over hard limit (we or our parents) */
1773 if ((parent_status == OVER_LIMIT) ||
1774 (allocated > sk_prot_mem_limits(sk, 2)))
1775 goto suppress_allocation;
1777 /* guarantee minimum buffer size under pressure */
1778 if (kind == SK_MEM_RECV) {
1779 if (atomic_read(&sk->sk_rmem_alloc) < prot->sysctl_rmem[0])
1782 } else { /* SK_MEM_SEND */
1783 if (sk->sk_type == SOCK_STREAM) {
1784 if (sk->sk_wmem_queued < prot->sysctl_wmem[0])
1786 } else if (atomic_read(&sk->sk_wmem_alloc) <
1787 prot->sysctl_wmem[0])
1791 if (sk_has_memory_pressure(sk)) {
1794 if (!sk_under_memory_pressure(sk))
1796 alloc = sk_sockets_allocated_read_positive(sk);
1797 if (sk_prot_mem_limits(sk, 2) > alloc *
1798 sk_mem_pages(sk->sk_wmem_queued +
1799 atomic_read(&sk->sk_rmem_alloc) +
1800 sk->sk_forward_alloc))
1804 suppress_allocation:
1806 if (kind == SK_MEM_SEND && sk->sk_type == SOCK_STREAM) {
1807 sk_stream_moderate_sndbuf(sk);
1809 /* Fail only if socket is _under_ its sndbuf.
1810 * In this case we cannot block, so that we have to fail.
1812 if (sk->sk_wmem_queued + size >= sk->sk_sndbuf)
1816 trace_sock_exceed_buf_limit(sk, prot, allocated);
1818 /* Alas. Undo changes. */
1819 sk->sk_forward_alloc -= amt * SK_MEM_QUANTUM;
1821 sk_memory_allocated_sub(sk, amt, parent_status);
1825 EXPORT_SYMBOL(__sk_mem_schedule);
1828 * __sk_reclaim - reclaim memory_allocated
1831 void __sk_mem_reclaim(struct sock *sk)
1833 sk_memory_allocated_sub(sk,
1834 sk->sk_forward_alloc >> SK_MEM_QUANTUM_SHIFT, 0);
1835 sk->sk_forward_alloc &= SK_MEM_QUANTUM - 1;
1837 if (sk_under_memory_pressure(sk) &&
1838 (sk_memory_allocated(sk) < sk_prot_mem_limits(sk, 0)))
1839 sk_leave_memory_pressure(sk);
1841 EXPORT_SYMBOL(__sk_mem_reclaim);
1845 * Set of default routines for initialising struct proto_ops when
1846 * the protocol does not support a particular function. In certain
1847 * cases where it makes no sense for a protocol to have a "do nothing"
1848 * function, some default processing is provided.
1851 int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len)
1855 EXPORT_SYMBOL(sock_no_bind);
1857 int sock_no_connect(struct socket *sock, struct sockaddr *saddr,
1862 EXPORT_SYMBOL(sock_no_connect);
1864 int sock_no_socketpair(struct socket *sock1, struct socket *sock2)
1868 EXPORT_SYMBOL(sock_no_socketpair);
1870 int sock_no_accept(struct socket *sock, struct socket *newsock, int flags)
1874 EXPORT_SYMBOL(sock_no_accept);
1876 int sock_no_getname(struct socket *sock, struct sockaddr *saddr,
1881 EXPORT_SYMBOL(sock_no_getname);
1883 unsigned int sock_no_poll(struct file *file, struct socket *sock, poll_table *pt)
1887 EXPORT_SYMBOL(sock_no_poll);
1889 int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1893 EXPORT_SYMBOL(sock_no_ioctl);
1895 int sock_no_listen(struct socket *sock, int backlog)
1899 EXPORT_SYMBOL(sock_no_listen);
1901 int sock_no_shutdown(struct socket *sock, int how)
1905 EXPORT_SYMBOL(sock_no_shutdown);
1907 int sock_no_setsockopt(struct socket *sock, int level, int optname,
1908 char __user *optval, unsigned int optlen)
1912 EXPORT_SYMBOL(sock_no_setsockopt);
1914 int sock_no_getsockopt(struct socket *sock, int level, int optname,
1915 char __user *optval, int __user *optlen)
1919 EXPORT_SYMBOL(sock_no_getsockopt);
1921 int sock_no_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
1926 EXPORT_SYMBOL(sock_no_sendmsg);
1928 int sock_no_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
1929 size_t len, int flags)
1933 EXPORT_SYMBOL(sock_no_recvmsg);
1935 int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma)
1937 /* Mirror missing mmap method error code */
1940 EXPORT_SYMBOL(sock_no_mmap);
1942 ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags)
1945 struct msghdr msg = {.msg_flags = flags};
1947 char *kaddr = kmap(page);
1948 iov.iov_base = kaddr + offset;
1950 res = kernel_sendmsg(sock, &msg, &iov, 1, size);
1954 EXPORT_SYMBOL(sock_no_sendpage);
1957 * Default Socket Callbacks
1960 static void sock_def_wakeup(struct sock *sk)
1962 struct socket_wq *wq;
1965 wq = rcu_dereference(sk->sk_wq);
1966 if (wq_has_sleeper(wq))
1967 wake_up_interruptible_all(&wq->wait);
1971 static void sock_def_error_report(struct sock *sk)
1973 struct socket_wq *wq;
1976 wq = rcu_dereference(sk->sk_wq);
1977 if (wq_has_sleeper(wq))
1978 wake_up_interruptible_poll(&wq->wait, POLLERR);
1979 sk_wake_async(sk, SOCK_WAKE_IO, POLL_ERR);
1983 static void sock_def_readable(struct sock *sk, int len)
1985 struct socket_wq *wq;
1988 wq = rcu_dereference(sk->sk_wq);
1989 if (wq_has_sleeper(wq))
1990 wake_up_interruptible_sync_poll(&wq->wait, POLLIN | POLLPRI |
1991 POLLRDNORM | POLLRDBAND);
1992 sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN);
1996 static void sock_def_write_space(struct sock *sk)
1998 struct socket_wq *wq;
2002 /* Do not wake up a writer until he can make "significant"
2005 if ((atomic_read(&sk->sk_wmem_alloc) << 1) <= sk->sk_sndbuf) {
2006 wq = rcu_dereference(sk->sk_wq);
2007 if (wq_has_sleeper(wq))
2008 wake_up_interruptible_sync_poll(&wq->wait, POLLOUT |
2009 POLLWRNORM | POLLWRBAND);
2011 /* Should agree with poll, otherwise some programs break */
2012 if (sock_writeable(sk))
2013 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
2019 static void sock_def_destruct(struct sock *sk)
2021 kfree(sk->sk_protinfo);
2024 void sk_send_sigurg(struct sock *sk)
2026 if (sk->sk_socket && sk->sk_socket->file)
2027 if (send_sigurg(&sk->sk_socket->file->f_owner))
2028 sk_wake_async(sk, SOCK_WAKE_URG, POLL_PRI);
2030 EXPORT_SYMBOL(sk_send_sigurg);
2032 void sk_reset_timer(struct sock *sk, struct timer_list* timer,
2033 unsigned long expires)
2035 if (!mod_timer(timer, expires))
2038 EXPORT_SYMBOL(sk_reset_timer);
2040 void sk_stop_timer(struct sock *sk, struct timer_list* timer)
2042 if (timer_pending(timer) && del_timer(timer))
2045 EXPORT_SYMBOL(sk_stop_timer);
2047 void sock_init_data(struct socket *sock, struct sock *sk)
2049 skb_queue_head_init(&sk->sk_receive_queue);
2050 skb_queue_head_init(&sk->sk_write_queue);
2051 skb_queue_head_init(&sk->sk_error_queue);
2052 #ifdef CONFIG_NET_DMA
2053 skb_queue_head_init(&sk->sk_async_wait_queue);
2056 sk->sk_send_head = NULL;
2058 init_timer(&sk->sk_timer);
2060 sk->sk_allocation = GFP_KERNEL;
2061 sk->sk_rcvbuf = sysctl_rmem_default;
2062 sk->sk_sndbuf = sysctl_wmem_default;
2063 sk->sk_state = TCP_CLOSE;
2064 sk_set_socket(sk, sock);
2066 sock_set_flag(sk, SOCK_ZAPPED);
2069 sk->sk_type = sock->type;
2070 sk->sk_wq = sock->wq;
2075 spin_lock_init(&sk->sk_dst_lock);
2076 rwlock_init(&sk->sk_callback_lock);
2077 lockdep_set_class_and_name(&sk->sk_callback_lock,
2078 af_callback_keys + sk->sk_family,
2079 af_family_clock_key_strings[sk->sk_family]);
2081 sk->sk_state_change = sock_def_wakeup;
2082 sk->sk_data_ready = sock_def_readable;
2083 sk->sk_write_space = sock_def_write_space;
2084 sk->sk_error_report = sock_def_error_report;
2085 sk->sk_destruct = sock_def_destruct;
2087 sk->sk_sndmsg_page = NULL;
2088 sk->sk_sndmsg_off = 0;
2090 sk->sk_peer_pid = NULL;
2091 sk->sk_peer_cred = NULL;
2092 sk->sk_write_pending = 0;
2093 sk->sk_rcvlowat = 1;
2094 sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT;
2095 sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT;
2097 sk->sk_stamp = ktime_set(-1L, 0);
2100 * Before updating sk_refcnt, we must commit prior changes to memory
2101 * (Documentation/RCU/rculist_nulls.txt for details)
2104 atomic_set(&sk->sk_refcnt, 1);
2105 atomic_set(&sk->sk_drops, 0);
2107 EXPORT_SYMBOL(sock_init_data);
2109 void lock_sock_nested(struct sock *sk, int subclass)
2112 spin_lock_bh(&sk->sk_lock.slock);
2113 if (sk->sk_lock.owned)
2115 sk->sk_lock.owned = 1;
2116 spin_unlock(&sk->sk_lock.slock);
2118 * The sk_lock has mutex_lock() semantics here:
2120 mutex_acquire(&sk->sk_lock.dep_map, subclass, 0, _RET_IP_);
2123 EXPORT_SYMBOL(lock_sock_nested);
2125 void release_sock(struct sock *sk)
2128 * The sk_lock has mutex_unlock() semantics:
2130 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_);
2132 spin_lock_bh(&sk->sk_lock.slock);
2133 if (sk->sk_backlog.tail)
2135 sk->sk_lock.owned = 0;
2136 if (waitqueue_active(&sk->sk_lock.wq))
2137 wake_up(&sk->sk_lock.wq);
2138 spin_unlock_bh(&sk->sk_lock.slock);
2140 EXPORT_SYMBOL(release_sock);
2143 * lock_sock_fast - fast version of lock_sock
2146 * This version should be used for very small section, where process wont block
2147 * return false if fast path is taken
2148 * sk_lock.slock locked, owned = 0, BH disabled
2149 * return true if slow path is taken
2150 * sk_lock.slock unlocked, owned = 1, BH enabled
2152 bool lock_sock_fast(struct sock *sk)
2155 spin_lock_bh(&sk->sk_lock.slock);
2157 if (!sk->sk_lock.owned)
2159 * Note : We must disable BH
2164 sk->sk_lock.owned = 1;
2165 spin_unlock(&sk->sk_lock.slock);
2167 * The sk_lock has mutex_lock() semantics here:
2169 mutex_acquire(&sk->sk_lock.dep_map, 0, 0, _RET_IP_);
2173 EXPORT_SYMBOL(lock_sock_fast);
2175 int sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp)
2178 if (!sock_flag(sk, SOCK_TIMESTAMP))
2179 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
2180 tv = ktime_to_timeval(sk->sk_stamp);
2181 if (tv.tv_sec == -1)
2183 if (tv.tv_sec == 0) {
2184 sk->sk_stamp = ktime_get_real();
2185 tv = ktime_to_timeval(sk->sk_stamp);
2187 return copy_to_user(userstamp, &tv, sizeof(tv)) ? -EFAULT : 0;
2189 EXPORT_SYMBOL(sock_get_timestamp);
2191 int sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp)
2194 if (!sock_flag(sk, SOCK_TIMESTAMP))
2195 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
2196 ts = ktime_to_timespec(sk->sk_stamp);
2197 if (ts.tv_sec == -1)
2199 if (ts.tv_sec == 0) {
2200 sk->sk_stamp = ktime_get_real();
2201 ts = ktime_to_timespec(sk->sk_stamp);
2203 return copy_to_user(userstamp, &ts, sizeof(ts)) ? -EFAULT : 0;
2205 EXPORT_SYMBOL(sock_get_timestampns);
2207 void sock_enable_timestamp(struct sock *sk, int flag)
2209 if (!sock_flag(sk, flag)) {
2210 unsigned long previous_flags = sk->sk_flags;
2212 sock_set_flag(sk, flag);
2214 * we just set one of the two flags which require net
2215 * time stamping, but time stamping might have been on
2216 * already because of the other one
2218 if (!(previous_flags & SK_FLAGS_TIMESTAMP))
2219 net_enable_timestamp();
2224 * Get a socket option on an socket.
2226 * FIX: POSIX 1003.1g is very ambiguous here. It states that
2227 * asynchronous errors should be reported by getsockopt. We assume
2228 * this means if you specify SO_ERROR (otherwise whats the point of it).
2230 int sock_common_getsockopt(struct socket *sock, int level, int optname,
2231 char __user *optval, int __user *optlen)
2233 struct sock *sk = sock->sk;
2235 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
2237 EXPORT_SYMBOL(sock_common_getsockopt);
2239 #ifdef CONFIG_COMPAT
2240 int compat_sock_common_getsockopt(struct socket *sock, int level, int optname,
2241 char __user *optval, int __user *optlen)
2243 struct sock *sk = sock->sk;
2245 if (sk->sk_prot->compat_getsockopt != NULL)
2246 return sk->sk_prot->compat_getsockopt(sk, level, optname,
2248 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
2250 EXPORT_SYMBOL(compat_sock_common_getsockopt);
2253 int sock_common_recvmsg(struct kiocb *iocb, struct socket *sock,
2254 struct msghdr *msg, size_t size, int flags)
2256 struct sock *sk = sock->sk;
2260 err = sk->sk_prot->recvmsg(iocb, sk, msg, size, flags & MSG_DONTWAIT,
2261 flags & ~MSG_DONTWAIT, &addr_len);
2263 msg->msg_namelen = addr_len;
2266 EXPORT_SYMBOL(sock_common_recvmsg);
2269 * Set socket options on an inet socket.
2271 int sock_common_setsockopt(struct socket *sock, int level, int optname,
2272 char __user *optval, unsigned int optlen)
2274 struct sock *sk = sock->sk;
2276 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
2278 EXPORT_SYMBOL(sock_common_setsockopt);
2280 #ifdef CONFIG_COMPAT
2281 int compat_sock_common_setsockopt(struct socket *sock, int level, int optname,
2282 char __user *optval, unsigned int optlen)
2284 struct sock *sk = sock->sk;
2286 if (sk->sk_prot->compat_setsockopt != NULL)
2287 return sk->sk_prot->compat_setsockopt(sk, level, optname,
2289 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
2291 EXPORT_SYMBOL(compat_sock_common_setsockopt);
2294 void sk_common_release(struct sock *sk)
2296 if (sk->sk_prot->destroy)
2297 sk->sk_prot->destroy(sk);
2300 * Observation: when sock_common_release is called, processes have
2301 * no access to socket. But net still has.
2302 * Step one, detach it from networking:
2304 * A. Remove from hash tables.
2307 sk->sk_prot->unhash(sk);
2310 * In this point socket cannot receive new packets, but it is possible
2311 * that some packets are in flight because some CPU runs receiver and
2312 * did hash table lookup before we unhashed socket. They will achieve
2313 * receive queue and will be purged by socket destructor.
2315 * Also we still have packets pending on receive queue and probably,
2316 * our own packets waiting in device queues. sock_destroy will drain
2317 * receive queue, but transmitted packets will delay socket destruction
2318 * until the last reference will be released.
2323 xfrm_sk_free_policy(sk);
2325 sk_refcnt_debug_release(sk);
2328 EXPORT_SYMBOL(sk_common_release);
2330 #ifdef CONFIG_PROC_FS
2331 #define PROTO_INUSE_NR 64 /* should be enough for the first time */
2333 int val[PROTO_INUSE_NR];
2336 static DECLARE_BITMAP(proto_inuse_idx, PROTO_INUSE_NR);
2338 #ifdef CONFIG_NET_NS
2339 void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
2341 __this_cpu_add(net->core.inuse->val[prot->inuse_idx], val);
2343 EXPORT_SYMBOL_GPL(sock_prot_inuse_add);
2345 int sock_prot_inuse_get(struct net *net, struct proto *prot)
2347 int cpu, idx = prot->inuse_idx;
2350 for_each_possible_cpu(cpu)
2351 res += per_cpu_ptr(net->core.inuse, cpu)->val[idx];
2353 return res >= 0 ? res : 0;
2355 EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
2357 static int __net_init sock_inuse_init_net(struct net *net)
2359 net->core.inuse = alloc_percpu(struct prot_inuse);
2360 return net->core.inuse ? 0 : -ENOMEM;
2363 static void __net_exit sock_inuse_exit_net(struct net *net)
2365 free_percpu(net->core.inuse);
2368 static struct pernet_operations net_inuse_ops = {
2369 .init = sock_inuse_init_net,
2370 .exit = sock_inuse_exit_net,
2373 static __init int net_inuse_init(void)
2375 if (register_pernet_subsys(&net_inuse_ops))
2376 panic("Cannot initialize net inuse counters");
2381 core_initcall(net_inuse_init);
2383 static DEFINE_PER_CPU(struct prot_inuse, prot_inuse);
2385 void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
2387 __this_cpu_add(prot_inuse.val[prot->inuse_idx], val);
2389 EXPORT_SYMBOL_GPL(sock_prot_inuse_add);
2391 int sock_prot_inuse_get(struct net *net, struct proto *prot)
2393 int cpu, idx = prot->inuse_idx;
2396 for_each_possible_cpu(cpu)
2397 res += per_cpu(prot_inuse, cpu).val[idx];
2399 return res >= 0 ? res : 0;
2401 EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
2404 static void assign_proto_idx(struct proto *prot)
2406 prot->inuse_idx = find_first_zero_bit(proto_inuse_idx, PROTO_INUSE_NR);
2408 if (unlikely(prot->inuse_idx == PROTO_INUSE_NR - 1)) {
2409 printk(KERN_ERR "PROTO_INUSE_NR exhausted\n");
2413 set_bit(prot->inuse_idx, proto_inuse_idx);
2416 static void release_proto_idx(struct proto *prot)
2418 if (prot->inuse_idx != PROTO_INUSE_NR - 1)
2419 clear_bit(prot->inuse_idx, proto_inuse_idx);
2422 static inline void assign_proto_idx(struct proto *prot)
2426 static inline void release_proto_idx(struct proto *prot)
2431 int proto_register(struct proto *prot, int alloc_slab)
2434 prot->slab = kmem_cache_create(prot->name, prot->obj_size, 0,
2435 SLAB_HWCACHE_ALIGN | prot->slab_flags,
2438 if (prot->slab == NULL) {
2439 printk(KERN_CRIT "%s: Can't create sock SLAB cache!\n",
2444 if (prot->rsk_prot != NULL) {
2445 prot->rsk_prot->slab_name = kasprintf(GFP_KERNEL, "request_sock_%s", prot->name);
2446 if (prot->rsk_prot->slab_name == NULL)
2447 goto out_free_sock_slab;
2449 prot->rsk_prot->slab = kmem_cache_create(prot->rsk_prot->slab_name,
2450 prot->rsk_prot->obj_size, 0,
2451 SLAB_HWCACHE_ALIGN, NULL);
2453 if (prot->rsk_prot->slab == NULL) {
2454 printk(KERN_CRIT "%s: Can't create request sock SLAB cache!\n",
2456 goto out_free_request_sock_slab_name;
2460 if (prot->twsk_prot != NULL) {
2461 prot->twsk_prot->twsk_slab_name = kasprintf(GFP_KERNEL, "tw_sock_%s", prot->name);
2463 if (prot->twsk_prot->twsk_slab_name == NULL)
2464 goto out_free_request_sock_slab;
2466 prot->twsk_prot->twsk_slab =
2467 kmem_cache_create(prot->twsk_prot->twsk_slab_name,
2468 prot->twsk_prot->twsk_obj_size,
2470 SLAB_HWCACHE_ALIGN |
2473 if (prot->twsk_prot->twsk_slab == NULL)
2474 goto out_free_timewait_sock_slab_name;
2478 mutex_lock(&proto_list_mutex);
2479 list_add(&prot->node, &proto_list);
2480 assign_proto_idx(prot);
2481 mutex_unlock(&proto_list_mutex);
2484 out_free_timewait_sock_slab_name:
2485 kfree(prot->twsk_prot->twsk_slab_name);
2486 out_free_request_sock_slab:
2487 if (prot->rsk_prot && prot->rsk_prot->slab) {
2488 kmem_cache_destroy(prot->rsk_prot->slab);
2489 prot->rsk_prot->slab = NULL;
2491 out_free_request_sock_slab_name:
2493 kfree(prot->rsk_prot->slab_name);
2495 kmem_cache_destroy(prot->slab);
2500 EXPORT_SYMBOL(proto_register);
2502 void proto_unregister(struct proto *prot)
2504 mutex_lock(&proto_list_mutex);
2505 release_proto_idx(prot);
2506 list_del(&prot->node);
2507 mutex_unlock(&proto_list_mutex);
2509 if (prot->slab != NULL) {
2510 kmem_cache_destroy(prot->slab);
2514 if (prot->rsk_prot != NULL && prot->rsk_prot->slab != NULL) {
2515 kmem_cache_destroy(prot->rsk_prot->slab);
2516 kfree(prot->rsk_prot->slab_name);
2517 prot->rsk_prot->slab = NULL;
2520 if (prot->twsk_prot != NULL && prot->twsk_prot->twsk_slab != NULL) {
2521 kmem_cache_destroy(prot->twsk_prot->twsk_slab);
2522 kfree(prot->twsk_prot->twsk_slab_name);
2523 prot->twsk_prot->twsk_slab = NULL;
2526 EXPORT_SYMBOL(proto_unregister);
2528 #ifdef CONFIG_PROC_FS
2529 static void *proto_seq_start(struct seq_file *seq, loff_t *pos)
2530 __acquires(proto_list_mutex)
2532 mutex_lock(&proto_list_mutex);
2533 return seq_list_start_head(&proto_list, *pos);
2536 static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2538 return seq_list_next(v, &proto_list, pos);
2541 static void proto_seq_stop(struct seq_file *seq, void *v)
2542 __releases(proto_list_mutex)
2544 mutex_unlock(&proto_list_mutex);
2547 static char proto_method_implemented(const void *method)
2549 return method == NULL ? 'n' : 'y';
2551 static long sock_prot_memory_allocated(struct proto *proto)
2553 return proto->memory_allocated != NULL ? proto_memory_allocated(proto): -1L;
2556 static char *sock_prot_memory_pressure(struct proto *proto)
2558 return proto->memory_pressure != NULL ?
2559 proto_memory_pressure(proto) ? "yes" : "no" : "NI";
2562 static void proto_seq_printf(struct seq_file *seq, struct proto *proto)
2565 seq_printf(seq, "%-9s %4u %6d %6ld %-3s %6u %-3s %-10s "
2566 "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n",
2569 sock_prot_inuse_get(seq_file_net(seq), proto),
2570 sock_prot_memory_allocated(proto),
2571 sock_prot_memory_pressure(proto),
2573 proto->slab == NULL ? "no" : "yes",
2574 module_name(proto->owner),
2575 proto_method_implemented(proto->close),
2576 proto_method_implemented(proto->connect),
2577 proto_method_implemented(proto->disconnect),
2578 proto_method_implemented(proto->accept),
2579 proto_method_implemented(proto->ioctl),
2580 proto_method_implemented(proto->init),
2581 proto_method_implemented(proto->destroy),
2582 proto_method_implemented(proto->shutdown),
2583 proto_method_implemented(proto->setsockopt),
2584 proto_method_implemented(proto->getsockopt),
2585 proto_method_implemented(proto->sendmsg),
2586 proto_method_implemented(proto->recvmsg),
2587 proto_method_implemented(proto->sendpage),
2588 proto_method_implemented(proto->bind),
2589 proto_method_implemented(proto->backlog_rcv),
2590 proto_method_implemented(proto->hash),
2591 proto_method_implemented(proto->unhash),
2592 proto_method_implemented(proto->get_port),
2593 proto_method_implemented(proto->enter_memory_pressure));
2596 static int proto_seq_show(struct seq_file *seq, void *v)
2598 if (v == &proto_list)
2599 seq_printf(seq, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s",
2608 "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n");
2610 proto_seq_printf(seq, list_entry(v, struct proto, node));
2614 static const struct seq_operations proto_seq_ops = {
2615 .start = proto_seq_start,
2616 .next = proto_seq_next,
2617 .stop = proto_seq_stop,
2618 .show = proto_seq_show,
2621 static int proto_seq_open(struct inode *inode, struct file *file)
2623 return seq_open_net(inode, file, &proto_seq_ops,
2624 sizeof(struct seq_net_private));
2627 static const struct file_operations proto_seq_fops = {
2628 .owner = THIS_MODULE,
2629 .open = proto_seq_open,
2631 .llseek = seq_lseek,
2632 .release = seq_release_net,
2635 static __net_init int proto_init_net(struct net *net)
2637 if (!proc_net_fops_create(net, "protocols", S_IRUGO, &proto_seq_fops))
2643 static __net_exit void proto_exit_net(struct net *net)
2645 proc_net_remove(net, "protocols");
2649 static __net_initdata struct pernet_operations proto_net_ops = {
2650 .init = proto_init_net,
2651 .exit = proto_exit_net,
2654 static int __init proto_init(void)
2656 return register_pernet_subsys(&proto_net_ops);
2659 subsys_initcall(proto_init);
2661 #endif /* PROC_FS */