2 * INET An implementation of the TCP/IP protocol suite for the LINUX
3 * operating system. INET is implemented using the BSD Socket
4 * interface as the means of communication with the user level.
6 * Generic socket support routines. Memory allocators, socket lock/release
7 * handler for protocols to use and generic option handler.
11 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
12 * Florian La Roche, <flla@stud.uni-sb.de>
13 * Alan Cox, <A.Cox@swansea.ac.uk>
16 * Alan Cox : Numerous verify_area() problems
17 * Alan Cox : Connecting on a connecting socket
18 * now returns an error for tcp.
19 * Alan Cox : sock->protocol is set correctly.
20 * and is not sometimes left as 0.
21 * Alan Cox : connect handles icmp errors on a
22 * connect properly. Unfortunately there
23 * is a restart syscall nasty there. I
24 * can't match BSD without hacking the C
25 * library. Ideas urgently sought!
26 * Alan Cox : Disallow bind() to addresses that are
27 * not ours - especially broadcast ones!!
28 * Alan Cox : Socket 1024 _IS_ ok for users. (fencepost)
29 * Alan Cox : sock_wfree/sock_rfree don't destroy sockets,
30 * instead they leave that for the DESTROY timer.
31 * Alan Cox : Clean up error flag in accept
32 * Alan Cox : TCP ack handling is buggy, the DESTROY timer
33 * was buggy. Put a remove_sock() in the handler
34 * for memory when we hit 0. Also altered the timer
35 * code. The ACK stuff can wait and needs major
37 * Alan Cox : Fixed TCP ack bug, removed remove sock
38 * and fixed timer/inet_bh race.
39 * Alan Cox : Added zapped flag for TCP
40 * Alan Cox : Move kfree_skb into skbuff.c and tidied up surplus code
41 * Alan Cox : for new sk_buff allocations wmalloc/rmalloc now call alloc_skb
42 * Alan Cox : kfree_s calls now are kfree_skbmem so we can track skb resources
43 * Alan Cox : Supports socket option broadcast now as does udp. Packet and raw need fixing.
44 * Alan Cox : Added RCVBUF,SNDBUF size setting. It suddenly occurred to me how easy it was so...
45 * Rick Sladkey : Relaxed UDP rules for matching packets.
46 * C.E.Hawkins : IFF_PROMISC/SIOCGHWADDR support
47 * Pauline Middelink : identd support
48 * Alan Cox : Fixed connect() taking signals I think.
49 * Alan Cox : SO_LINGER supported
50 * Alan Cox : Error reporting fixes
51 * Anonymous : inet_create tidied up (sk->reuse setting)
52 * Alan Cox : inet sockets don't set sk->type!
53 * Alan Cox : Split socket option code
54 * Alan Cox : Callbacks
55 * Alan Cox : Nagle flag for Charles & Johannes stuff
56 * Alex : Removed restriction on inet fioctl
57 * Alan Cox : Splitting INET from NET core
58 * Alan Cox : Fixed bogus SO_TYPE handling in getsockopt()
59 * Adam Caldwell : Missing return in SO_DONTROUTE/SO_DEBUG code
60 * Alan Cox : Split IP from generic code
61 * Alan Cox : New kfree_skbmem()
62 * Alan Cox : Make SO_DEBUG superuser only.
63 * Alan Cox : Allow anyone to clear SO_DEBUG
65 * Alan Cox : Added optimistic memory grabbing for AF_UNIX throughput.
66 * Alan Cox : Allocator for a socket is settable.
67 * Alan Cox : SO_ERROR includes soft errors.
68 * Alan Cox : Allow NULL arguments on some SO_ opts
69 * Alan Cox : Generic socket allocation to make hooks
70 * easier (suggested by Craig Metz).
71 * Michael Pall : SO_ERROR returns positive errno again
72 * Steve Whitehouse: Added default destructor to free
73 * protocol private data.
74 * Steve Whitehouse: Added various other default routines
75 * common to several socket families.
76 * Chris Evans : Call suser() check last on F_SETOWN
77 * Jay Schulist : Added SO_ATTACH_FILTER and SO_DETACH_FILTER.
78 * Andi Kleen : Add sock_kmalloc()/sock_kfree_s()
79 * Andi Kleen : Fix write_space callback
80 * Chris Evans : Security fixes - signedness again
81 * Arnaldo C. Melo : cleanups, use skb_queue_purge
86 * This program is free software; you can redistribute it and/or
87 * modify it under the terms of the GNU General Public License
88 * as published by the Free Software Foundation; either version
89 * 2 of the License, or (at your option) any later version.
92 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
94 #include <linux/capability.h>
95 #include <linux/errno.h>
96 #include <linux/errqueue.h>
97 #include <linux/types.h>
98 #include <linux/socket.h>
100 #include <linux/kernel.h>
101 #include <linux/module.h>
102 #include <linux/proc_fs.h>
103 #include <linux/seq_file.h>
104 #include <linux/sched.h>
105 #include <linux/timer.h>
106 #include <linux/string.h>
107 #include <linux/sockios.h>
108 #include <linux/net.h>
109 #include <linux/mm.h>
110 #include <linux/slab.h>
111 #include <linux/interrupt.h>
112 #include <linux/poll.h>
113 #include <linux/tcp.h>
114 #include <linux/init.h>
115 #include <linux/highmem.h>
116 #include <linux/user_namespace.h>
117 #include <linux/static_key.h>
118 #include <linux/memcontrol.h>
119 #include <linux/prefetch.h>
121 #include <asm/uaccess.h>
123 #include <linux/netdevice.h>
124 #include <net/protocol.h>
125 #include <linux/skbuff.h>
126 #include <net/net_namespace.h>
127 #include <net/request_sock.h>
128 #include <net/sock.h>
129 #include <linux/net_tstamp.h>
130 #include <net/xfrm.h>
131 #include <linux/ipsec.h>
132 #include <net/cls_cgroup.h>
133 #include <net/netprio_cgroup.h>
135 #include <linux/filter.h>
137 #include <trace/events/sock.h>
143 #include <net/busy_poll.h>
145 static DEFINE_MUTEX(proto_list_mutex
);
146 static LIST_HEAD(proto_list
);
148 #ifdef CONFIG_MEMCG_KMEM
149 int mem_cgroup_sockets_init(struct mem_cgroup
*memcg
, struct cgroup_subsys
*ss
)
154 mutex_lock(&proto_list_mutex
);
155 list_for_each_entry(proto
, &proto_list
, node
) {
156 if (proto
->init_cgroup
) {
157 ret
= proto
->init_cgroup(memcg
, ss
);
163 mutex_unlock(&proto_list_mutex
);
166 list_for_each_entry_continue_reverse(proto
, &proto_list
, node
)
167 if (proto
->destroy_cgroup
)
168 proto
->destroy_cgroup(memcg
);
169 mutex_unlock(&proto_list_mutex
);
173 void mem_cgroup_sockets_destroy(struct mem_cgroup
*memcg
)
177 mutex_lock(&proto_list_mutex
);
178 list_for_each_entry_reverse(proto
, &proto_list
, node
)
179 if (proto
->destroy_cgroup
)
180 proto
->destroy_cgroup(memcg
);
181 mutex_unlock(&proto_list_mutex
);
186 * Each address family might have different locking rules, so we have
187 * one slock key per address family:
189 static struct lock_class_key af_family_keys
[AF_MAX
];
190 static struct lock_class_key af_family_slock_keys
[AF_MAX
];
192 #if defined(CONFIG_MEMCG_KMEM)
193 struct static_key memcg_socket_limit_enabled
;
194 EXPORT_SYMBOL(memcg_socket_limit_enabled
);
198 * Make lock validator output more readable. (we pre-construct these
199 * strings build-time, so that runtime initialization of socket
202 static const char *const af_family_key_strings
[AF_MAX
+1] = {
203 "sk_lock-AF_UNSPEC", "sk_lock-AF_UNIX" , "sk_lock-AF_INET" ,
204 "sk_lock-AF_AX25" , "sk_lock-AF_IPX" , "sk_lock-AF_APPLETALK",
205 "sk_lock-AF_NETROM", "sk_lock-AF_BRIDGE" , "sk_lock-AF_ATMPVC" ,
206 "sk_lock-AF_X25" , "sk_lock-AF_INET6" , "sk_lock-AF_ROSE" ,
207 "sk_lock-AF_DECnet", "sk_lock-AF_NETBEUI" , "sk_lock-AF_SECURITY" ,
208 "sk_lock-AF_KEY" , "sk_lock-AF_NETLINK" , "sk_lock-AF_PACKET" ,
209 "sk_lock-AF_ASH" , "sk_lock-AF_ECONET" , "sk_lock-AF_ATMSVC" ,
210 "sk_lock-AF_RDS" , "sk_lock-AF_SNA" , "sk_lock-AF_IRDA" ,
211 "sk_lock-AF_PPPOX" , "sk_lock-AF_WANPIPE" , "sk_lock-AF_LLC" ,
212 "sk_lock-27" , "sk_lock-28" , "sk_lock-AF_CAN" ,
213 "sk_lock-AF_TIPC" , "sk_lock-AF_BLUETOOTH", "sk_lock-IUCV" ,
214 "sk_lock-AF_RXRPC" , "sk_lock-AF_ISDN" , "sk_lock-AF_PHONET" ,
215 "sk_lock-AF_IEEE802154", "sk_lock-AF_CAIF" , "sk_lock-AF_ALG" ,
216 "sk_lock-AF_NFC" , "sk_lock-AF_VSOCK" , "sk_lock-AF_MAX"
218 static const char *const af_family_slock_key_strings
[AF_MAX
+1] = {
219 "slock-AF_UNSPEC", "slock-AF_UNIX" , "slock-AF_INET" ,
220 "slock-AF_AX25" , "slock-AF_IPX" , "slock-AF_APPLETALK",
221 "slock-AF_NETROM", "slock-AF_BRIDGE" , "slock-AF_ATMPVC" ,
222 "slock-AF_X25" , "slock-AF_INET6" , "slock-AF_ROSE" ,
223 "slock-AF_DECnet", "slock-AF_NETBEUI" , "slock-AF_SECURITY" ,
224 "slock-AF_KEY" , "slock-AF_NETLINK" , "slock-AF_PACKET" ,
225 "slock-AF_ASH" , "slock-AF_ECONET" , "slock-AF_ATMSVC" ,
226 "slock-AF_RDS" , "slock-AF_SNA" , "slock-AF_IRDA" ,
227 "slock-AF_PPPOX" , "slock-AF_WANPIPE" , "slock-AF_LLC" ,
228 "slock-27" , "slock-28" , "slock-AF_CAN" ,
229 "slock-AF_TIPC" , "slock-AF_BLUETOOTH", "slock-AF_IUCV" ,
230 "slock-AF_RXRPC" , "slock-AF_ISDN" , "slock-AF_PHONET" ,
231 "slock-AF_IEEE802154", "slock-AF_CAIF" , "slock-AF_ALG" ,
232 "slock-AF_NFC" , "slock-AF_VSOCK" ,"slock-AF_MAX"
234 static const char *const af_family_clock_key_strings
[AF_MAX
+1] = {
235 "clock-AF_UNSPEC", "clock-AF_UNIX" , "clock-AF_INET" ,
236 "clock-AF_AX25" , "clock-AF_IPX" , "clock-AF_APPLETALK",
237 "clock-AF_NETROM", "clock-AF_BRIDGE" , "clock-AF_ATMPVC" ,
238 "clock-AF_X25" , "clock-AF_INET6" , "clock-AF_ROSE" ,
239 "clock-AF_DECnet", "clock-AF_NETBEUI" , "clock-AF_SECURITY" ,
240 "clock-AF_KEY" , "clock-AF_NETLINK" , "clock-AF_PACKET" ,
241 "clock-AF_ASH" , "clock-AF_ECONET" , "clock-AF_ATMSVC" ,
242 "clock-AF_RDS" , "clock-AF_SNA" , "clock-AF_IRDA" ,
243 "clock-AF_PPPOX" , "clock-AF_WANPIPE" , "clock-AF_LLC" ,
244 "clock-27" , "clock-28" , "clock-AF_CAN" ,
245 "clock-AF_TIPC" , "clock-AF_BLUETOOTH", "clock-AF_IUCV" ,
246 "clock-AF_RXRPC" , "clock-AF_ISDN" , "clock-AF_PHONET" ,
247 "clock-AF_IEEE802154", "clock-AF_CAIF" , "clock-AF_ALG" ,
248 "clock-AF_NFC" , "clock-AF_VSOCK" , "clock-AF_MAX"
252 * sk_callback_lock locking rules are per-address-family,
253 * so split the lock classes by using a per-AF key:
255 static struct lock_class_key af_callback_keys
[AF_MAX
];
257 /* Take into consideration the size of the struct sk_buff overhead in the
258 * determination of these values, since that is non-constant across
259 * platforms. This makes socket queueing behavior and performance
260 * not depend upon such differences.
262 #define _SK_MEM_PACKETS 256
263 #define _SK_MEM_OVERHEAD SKB_TRUESIZE(256)
264 #define SK_WMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS)
265 #define SK_RMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS)
267 /* Run time adjustable parameters. */
268 __u32 sysctl_wmem_max __read_mostly
= SK_WMEM_MAX
;
269 EXPORT_SYMBOL(sysctl_wmem_max
);
270 __u32 sysctl_rmem_max __read_mostly
= SK_RMEM_MAX
;
271 EXPORT_SYMBOL(sysctl_rmem_max
);
272 __u32 sysctl_wmem_default __read_mostly
= SK_WMEM_MAX
;
273 __u32 sysctl_rmem_default __read_mostly
= SK_RMEM_MAX
;
275 /* Maximal space eaten by iovec or ancillary data plus some space */
276 int sysctl_optmem_max __read_mostly
= sizeof(unsigned long)*(2*UIO_MAXIOV
+512);
277 EXPORT_SYMBOL(sysctl_optmem_max
);
279 struct static_key memalloc_socks
= STATIC_KEY_INIT_FALSE
;
280 EXPORT_SYMBOL_GPL(memalloc_socks
);
283 * sk_set_memalloc - sets %SOCK_MEMALLOC
284 * @sk: socket to set it on
286 * Set %SOCK_MEMALLOC on a socket for access to emergency reserves.
287 * It's the responsibility of the admin to adjust min_free_kbytes
288 * to meet the requirements
290 void sk_set_memalloc(struct sock
*sk
)
292 sock_set_flag(sk
, SOCK_MEMALLOC
);
293 sk
->sk_allocation
|= __GFP_MEMALLOC
;
294 static_key_slow_inc(&memalloc_socks
);
296 EXPORT_SYMBOL_GPL(sk_set_memalloc
);
298 void sk_clear_memalloc(struct sock
*sk
)
300 sock_reset_flag(sk
, SOCK_MEMALLOC
);
301 sk
->sk_allocation
&= ~__GFP_MEMALLOC
;
302 static_key_slow_dec(&memalloc_socks
);
305 * SOCK_MEMALLOC is allowed to ignore rmem limits to ensure forward
306 * progress of swapping. However, if SOCK_MEMALLOC is cleared while
307 * it has rmem allocations there is a risk that the user of the
308 * socket cannot make forward progress due to exceeding the rmem
309 * limits. By rights, sk_clear_memalloc() should only be called
310 * on sockets being torn down but warn and reset the accounting if
311 * that assumption breaks.
313 if (WARN_ON(sk
->sk_forward_alloc
))
316 EXPORT_SYMBOL_GPL(sk_clear_memalloc
);
318 int __sk_backlog_rcv(struct sock
*sk
, struct sk_buff
*skb
)
321 unsigned long pflags
= current
->flags
;
323 /* these should have been dropped before queueing */
324 BUG_ON(!sock_flag(sk
, SOCK_MEMALLOC
));
326 current
->flags
|= PF_MEMALLOC
;
327 ret
= sk
->sk_backlog_rcv(sk
, skb
);
328 tsk_restore_flags(current
, pflags
, PF_MEMALLOC
);
332 EXPORT_SYMBOL(__sk_backlog_rcv
);
334 static int sock_set_timeout(long *timeo_p
, char __user
*optval
, int optlen
)
338 if (optlen
< sizeof(tv
))
340 if (copy_from_user(&tv
, optval
, sizeof(tv
)))
342 if (tv
.tv_usec
< 0 || tv
.tv_usec
>= USEC_PER_SEC
)
346 static int warned __read_mostly
;
349 if (warned
< 10 && net_ratelimit()) {
351 pr_info("%s: `%s' (pid %d) tries to set negative timeout\n",
352 __func__
, current
->comm
, task_pid_nr(current
));
356 *timeo_p
= MAX_SCHEDULE_TIMEOUT
;
357 if (tv
.tv_sec
== 0 && tv
.tv_usec
== 0)
359 if (tv
.tv_sec
< (MAX_SCHEDULE_TIMEOUT
/HZ
- 1))
360 *timeo_p
= tv
.tv_sec
*HZ
+ (tv
.tv_usec
+(1000000/HZ
-1))/(1000000/HZ
);
364 static void sock_warn_obsolete_bsdism(const char *name
)
367 static char warncomm
[TASK_COMM_LEN
];
368 if (strcmp(warncomm
, current
->comm
) && warned
< 5) {
369 strcpy(warncomm
, current
->comm
);
370 pr_warn("process `%s' is using obsolete %s SO_BSDCOMPAT\n",
376 #define SK_FLAGS_TIMESTAMP ((1UL << SOCK_TIMESTAMP) | (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE))
378 static void sock_disable_timestamp(struct sock
*sk
, unsigned long flags
)
380 if (sk
->sk_flags
& flags
) {
381 sk
->sk_flags
&= ~flags
;
382 if (!(sk
->sk_flags
& SK_FLAGS_TIMESTAMP
))
383 net_disable_timestamp();
388 int sock_queue_rcv_skb(struct sock
*sk
, struct sk_buff
*skb
)
393 struct sk_buff_head
*list
= &sk
->sk_receive_queue
;
395 if (atomic_read(&sk
->sk_rmem_alloc
) >= sk
->sk_rcvbuf
) {
396 atomic_inc(&sk
->sk_drops
);
397 trace_sock_rcvqueue_full(sk
, skb
);
401 err
= sk_filter(sk
, skb
);
405 if (!sk_rmem_schedule(sk
, skb
, skb
->truesize
)) {
406 atomic_inc(&sk
->sk_drops
);
411 skb_set_owner_r(skb
, sk
);
413 /* Cache the SKB length before we tack it onto the receive
414 * queue. Once it is added it no longer belongs to us and
415 * may be freed by other threads of control pulling packets
420 /* we escape from rcu protected region, make sure we dont leak
425 spin_lock_irqsave(&list
->lock
, flags
);
426 skb
->dropcount
= atomic_read(&sk
->sk_drops
);
427 __skb_queue_tail(list
, skb
);
428 spin_unlock_irqrestore(&list
->lock
, flags
);
430 if (!sock_flag(sk
, SOCK_DEAD
))
431 sk
->sk_data_ready(sk
, skb_len
);
434 EXPORT_SYMBOL(sock_queue_rcv_skb
);
436 int sk_receive_skb(struct sock
*sk
, struct sk_buff
*skb
, const int nested
)
438 int rc
= NET_RX_SUCCESS
;
440 if (sk_filter(sk
, skb
))
441 goto discard_and_relse
;
445 if (sk_rcvqueues_full(sk
, skb
, sk
->sk_rcvbuf
)) {
446 atomic_inc(&sk
->sk_drops
);
447 goto discard_and_relse
;
450 bh_lock_sock_nested(sk
);
453 if (!sock_owned_by_user(sk
)) {
455 * trylock + unlock semantics:
457 mutex_acquire(&sk
->sk_lock
.dep_map
, 0, 1, _RET_IP_
);
459 rc
= sk_backlog_rcv(sk
, skb
);
461 mutex_release(&sk
->sk_lock
.dep_map
, 1, _RET_IP_
);
462 } else if (sk_add_backlog(sk
, skb
, sk
->sk_rcvbuf
)) {
464 atomic_inc(&sk
->sk_drops
);
465 goto discard_and_relse
;
476 EXPORT_SYMBOL(sk_receive_skb
);
478 struct dst_entry
*__sk_dst_check(struct sock
*sk
, u32 cookie
)
480 struct dst_entry
*dst
= __sk_dst_get(sk
);
482 if (dst
&& dst
->obsolete
&& dst
->ops
->check(dst
, cookie
) == NULL
) {
483 sk_tx_queue_clear(sk
);
484 RCU_INIT_POINTER(sk
->sk_dst_cache
, NULL
);
491 EXPORT_SYMBOL(__sk_dst_check
);
493 struct dst_entry
*sk_dst_check(struct sock
*sk
, u32 cookie
)
495 struct dst_entry
*dst
= sk_dst_get(sk
);
497 if (dst
&& dst
->obsolete
&& dst
->ops
->check(dst
, cookie
) == NULL
) {
505 EXPORT_SYMBOL(sk_dst_check
);
507 static int sock_setbindtodevice(struct sock
*sk
, char __user
*optval
,
510 int ret
= -ENOPROTOOPT
;
511 #ifdef CONFIG_NETDEVICES
512 struct net
*net
= sock_net(sk
);
513 char devname
[IFNAMSIZ
];
518 if (!ns_capable(net
->user_ns
, CAP_NET_RAW
))
525 /* Bind this socket to a particular device like "eth0",
526 * as specified in the passed interface name. If the
527 * name is "" or the option length is zero the socket
530 if (optlen
> IFNAMSIZ
- 1)
531 optlen
= IFNAMSIZ
- 1;
532 memset(devname
, 0, sizeof(devname
));
535 if (copy_from_user(devname
, optval
, optlen
))
539 if (devname
[0] != '\0') {
540 struct net_device
*dev
;
543 dev
= dev_get_by_name_rcu(net
, devname
);
545 index
= dev
->ifindex
;
553 sk
->sk_bound_dev_if
= index
;
565 static int sock_getbindtodevice(struct sock
*sk
, char __user
*optval
,
566 int __user
*optlen
, int len
)
568 int ret
= -ENOPROTOOPT
;
569 #ifdef CONFIG_NETDEVICES
570 struct net
*net
= sock_net(sk
);
571 char devname
[IFNAMSIZ
];
573 if (sk
->sk_bound_dev_if
== 0) {
582 ret
= netdev_get_name(net
, devname
, sk
->sk_bound_dev_if
);
586 len
= strlen(devname
) + 1;
589 if (copy_to_user(optval
, devname
, len
))
594 if (put_user(len
, optlen
))
605 static inline void sock_valbool_flag(struct sock
*sk
, int bit
, int valbool
)
608 sock_set_flag(sk
, bit
);
610 sock_reset_flag(sk
, bit
);
614 * This is meant for all protocols to use and covers goings on
615 * at the socket level. Everything here is generic.
618 int sock_setsockopt(struct socket
*sock
, int level
, int optname
,
619 char __user
*optval
, unsigned int optlen
)
621 struct sock
*sk
= sock
->sk
;
628 * Options without arguments
631 if (optname
== SO_BINDTODEVICE
)
632 return sock_setbindtodevice(sk
, optval
, optlen
);
634 if (optlen
< sizeof(int))
637 if (get_user(val
, (int __user
*)optval
))
640 valbool
= val
? 1 : 0;
646 if (val
&& !capable(CAP_NET_ADMIN
))
649 sock_valbool_flag(sk
, SOCK_DBG
, valbool
);
652 sk
->sk_reuse
= (valbool
? SK_CAN_REUSE
: SK_NO_REUSE
);
655 sk
->sk_reuseport
= valbool
;
664 sock_valbool_flag(sk
, SOCK_LOCALROUTE
, valbool
);
667 sock_valbool_flag(sk
, SOCK_BROADCAST
, valbool
);
670 /* Don't error on this BSD doesn't and if you think
671 * about it this is right. Otherwise apps have to
672 * play 'guess the biggest size' games. RCVBUF/SNDBUF
673 * are treated in BSD as hints
675 val
= min_t(u32
, val
, sysctl_wmem_max
);
677 sk
->sk_userlocks
|= SOCK_SNDBUF_LOCK
;
678 sk
->sk_sndbuf
= max_t(u32
, val
* 2, SOCK_MIN_SNDBUF
);
679 /* Wake up sending tasks if we upped the value. */
680 sk
->sk_write_space(sk
);
684 if (!capable(CAP_NET_ADMIN
)) {
691 /* Don't error on this BSD doesn't and if you think
692 * about it this is right. Otherwise apps have to
693 * play 'guess the biggest size' games. RCVBUF/SNDBUF
694 * are treated in BSD as hints
696 val
= min_t(u32
, val
, sysctl_rmem_max
);
698 sk
->sk_userlocks
|= SOCK_RCVBUF_LOCK
;
700 * We double it on the way in to account for
701 * "struct sk_buff" etc. overhead. Applications
702 * assume that the SO_RCVBUF setting they make will
703 * allow that much actual data to be received on that
706 * Applications are unaware that "struct sk_buff" and
707 * other overheads allocate from the receive buffer
708 * during socket buffer allocation.
710 * And after considering the possible alternatives,
711 * returning the value we actually used in getsockopt
712 * is the most desirable behavior.
714 sk
->sk_rcvbuf
= max_t(u32
, val
* 2, SOCK_MIN_RCVBUF
);
718 if (!capable(CAP_NET_ADMIN
)) {
726 if (sk
->sk_protocol
== IPPROTO_TCP
&&
727 sk
->sk_type
== SOCK_STREAM
)
728 tcp_set_keepalive(sk
, valbool
);
730 sock_valbool_flag(sk
, SOCK_KEEPOPEN
, valbool
);
734 sock_valbool_flag(sk
, SOCK_URGINLINE
, valbool
);
738 sk
->sk_no_check
= valbool
;
742 if ((val
>= 0 && val
<= 6) ||
743 ns_capable(sock_net(sk
)->user_ns
, CAP_NET_ADMIN
))
744 sk
->sk_priority
= val
;
750 if (optlen
< sizeof(ling
)) {
751 ret
= -EINVAL
; /* 1003.1g */
754 if (copy_from_user(&ling
, optval
, sizeof(ling
))) {
759 sock_reset_flag(sk
, SOCK_LINGER
);
761 #if (BITS_PER_LONG == 32)
762 if ((unsigned int)ling
.l_linger
>= MAX_SCHEDULE_TIMEOUT
/HZ
)
763 sk
->sk_lingertime
= MAX_SCHEDULE_TIMEOUT
;
766 sk
->sk_lingertime
= (unsigned int)ling
.l_linger
* HZ
;
767 sock_set_flag(sk
, SOCK_LINGER
);
772 sock_warn_obsolete_bsdism("setsockopt");
777 set_bit(SOCK_PASSCRED
, &sock
->flags
);
779 clear_bit(SOCK_PASSCRED
, &sock
->flags
);
785 if (optname
== SO_TIMESTAMP
)
786 sock_reset_flag(sk
, SOCK_RCVTSTAMPNS
);
788 sock_set_flag(sk
, SOCK_RCVTSTAMPNS
);
789 sock_set_flag(sk
, SOCK_RCVTSTAMP
);
790 sock_enable_timestamp(sk
, SOCK_TIMESTAMP
);
792 sock_reset_flag(sk
, SOCK_RCVTSTAMP
);
793 sock_reset_flag(sk
, SOCK_RCVTSTAMPNS
);
797 case SO_TIMESTAMPING
:
798 if (val
& ~SOF_TIMESTAMPING_MASK
) {
802 sock_valbool_flag(sk
, SOCK_TIMESTAMPING_TX_HARDWARE
,
803 val
& SOF_TIMESTAMPING_TX_HARDWARE
);
804 sock_valbool_flag(sk
, SOCK_TIMESTAMPING_TX_SOFTWARE
,
805 val
& SOF_TIMESTAMPING_TX_SOFTWARE
);
806 sock_valbool_flag(sk
, SOCK_TIMESTAMPING_RX_HARDWARE
,
807 val
& SOF_TIMESTAMPING_RX_HARDWARE
);
808 if (val
& SOF_TIMESTAMPING_RX_SOFTWARE
)
809 sock_enable_timestamp(sk
,
810 SOCK_TIMESTAMPING_RX_SOFTWARE
);
812 sock_disable_timestamp(sk
,
813 (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE
));
814 sock_valbool_flag(sk
, SOCK_TIMESTAMPING_SOFTWARE
,
815 val
& SOF_TIMESTAMPING_SOFTWARE
);
816 sock_valbool_flag(sk
, SOCK_TIMESTAMPING_SYS_HARDWARE
,
817 val
& SOF_TIMESTAMPING_SYS_HARDWARE
);
818 sock_valbool_flag(sk
, SOCK_TIMESTAMPING_RAW_HARDWARE
,
819 val
& SOF_TIMESTAMPING_RAW_HARDWARE
);
825 sk
->sk_rcvlowat
= val
? : 1;
829 ret
= sock_set_timeout(&sk
->sk_rcvtimeo
, optval
, optlen
);
833 ret
= sock_set_timeout(&sk
->sk_sndtimeo
, optval
, optlen
);
836 case SO_ATTACH_FILTER
:
838 if (optlen
== sizeof(struct sock_fprog
)) {
839 struct sock_fprog fprog
;
842 if (copy_from_user(&fprog
, optval
, sizeof(fprog
)))
845 ret
= sk_attach_filter(&fprog
, sk
);
849 case SO_DETACH_FILTER
:
850 ret
= sk_detach_filter(sk
);
854 if (sock_flag(sk
, SOCK_FILTER_LOCKED
) && !valbool
)
857 sock_valbool_flag(sk
, SOCK_FILTER_LOCKED
, valbool
);
862 set_bit(SOCK_PASSSEC
, &sock
->flags
);
864 clear_bit(SOCK_PASSSEC
, &sock
->flags
);
867 if (!ns_capable(sock_net(sk
)->user_ns
, CAP_NET_ADMIN
))
873 /* We implement the SO_SNDLOWAT etc to
874 not be settable (1003.1g 5.3) */
876 sock_valbool_flag(sk
, SOCK_RXQ_OVFL
, valbool
);
880 sock_valbool_flag(sk
, SOCK_WIFI_STATUS
, valbool
);
884 if (sock
->ops
->set_peek_off
)
885 ret
= sock
->ops
->set_peek_off(sk
, val
);
891 sock_valbool_flag(sk
, SOCK_NOFCS
, valbool
);
894 case SO_SELECT_ERR_QUEUE
:
895 sock_valbool_flag(sk
, SOCK_SELECT_ERR_QUEUE
, valbool
);
898 #ifdef CONFIG_NET_RX_BUSY_POLL
900 /* allow unprivileged users to decrease the value */
901 if ((val
> sk
->sk_ll_usec
) && !capable(CAP_NET_ADMIN
))
907 sk
->sk_ll_usec
= val
;
912 case SO_MAX_PACING_RATE
:
913 sk
->sk_max_pacing_rate
= val
;
914 sk
->sk_pacing_rate
= min(sk
->sk_pacing_rate
,
915 sk
->sk_max_pacing_rate
);
925 EXPORT_SYMBOL(sock_setsockopt
);
928 static void cred_to_ucred(struct pid
*pid
, const struct cred
*cred
,
931 ucred
->pid
= pid_vnr(pid
);
932 ucred
->uid
= ucred
->gid
= -1;
934 struct user_namespace
*current_ns
= current_user_ns();
936 ucred
->uid
= from_kuid_munged(current_ns
, cred
->euid
);
937 ucred
->gid
= from_kgid_munged(current_ns
, cred
->egid
);
941 int sock_getsockopt(struct socket
*sock
, int level
, int optname
,
942 char __user
*optval
, int __user
*optlen
)
944 struct sock
*sk
= sock
->sk
;
952 int lv
= sizeof(int);
955 if (get_user(len
, optlen
))
960 memset(&v
, 0, sizeof(v
));
964 v
.val
= sock_flag(sk
, SOCK_DBG
);
968 v
.val
= sock_flag(sk
, SOCK_LOCALROUTE
);
972 v
.val
= sock_flag(sk
, SOCK_BROADCAST
);
976 v
.val
= sk
->sk_sndbuf
;
980 v
.val
= sk
->sk_rcvbuf
;
984 v
.val
= sk
->sk_reuse
;
988 v
.val
= sk
->sk_reuseport
;
992 v
.val
= sock_flag(sk
, SOCK_KEEPOPEN
);
1000 v
.val
= sk
->sk_protocol
;
1004 v
.val
= sk
->sk_family
;
1008 v
.val
= -sock_error(sk
);
1010 v
.val
= xchg(&sk
->sk_err_soft
, 0);
1014 v
.val
= sock_flag(sk
, SOCK_URGINLINE
);
1018 v
.val
= sk
->sk_no_check
;
1022 v
.val
= sk
->sk_priority
;
1026 lv
= sizeof(v
.ling
);
1027 v
.ling
.l_onoff
= sock_flag(sk
, SOCK_LINGER
);
1028 v
.ling
.l_linger
= sk
->sk_lingertime
/ HZ
;
1032 sock_warn_obsolete_bsdism("getsockopt");
1036 v
.val
= sock_flag(sk
, SOCK_RCVTSTAMP
) &&
1037 !sock_flag(sk
, SOCK_RCVTSTAMPNS
);
1040 case SO_TIMESTAMPNS
:
1041 v
.val
= sock_flag(sk
, SOCK_RCVTSTAMPNS
);
1044 case SO_TIMESTAMPING
:
1046 if (sock_flag(sk
, SOCK_TIMESTAMPING_TX_HARDWARE
))
1047 v
.val
|= SOF_TIMESTAMPING_TX_HARDWARE
;
1048 if (sock_flag(sk
, SOCK_TIMESTAMPING_TX_SOFTWARE
))
1049 v
.val
|= SOF_TIMESTAMPING_TX_SOFTWARE
;
1050 if (sock_flag(sk
, SOCK_TIMESTAMPING_RX_HARDWARE
))
1051 v
.val
|= SOF_TIMESTAMPING_RX_HARDWARE
;
1052 if (sock_flag(sk
, SOCK_TIMESTAMPING_RX_SOFTWARE
))
1053 v
.val
|= SOF_TIMESTAMPING_RX_SOFTWARE
;
1054 if (sock_flag(sk
, SOCK_TIMESTAMPING_SOFTWARE
))
1055 v
.val
|= SOF_TIMESTAMPING_SOFTWARE
;
1056 if (sock_flag(sk
, SOCK_TIMESTAMPING_SYS_HARDWARE
))
1057 v
.val
|= SOF_TIMESTAMPING_SYS_HARDWARE
;
1058 if (sock_flag(sk
, SOCK_TIMESTAMPING_RAW_HARDWARE
))
1059 v
.val
|= SOF_TIMESTAMPING_RAW_HARDWARE
;
1063 lv
= sizeof(struct timeval
);
1064 if (sk
->sk_rcvtimeo
== MAX_SCHEDULE_TIMEOUT
) {
1068 v
.tm
.tv_sec
= sk
->sk_rcvtimeo
/ HZ
;
1069 v
.tm
.tv_usec
= ((sk
->sk_rcvtimeo
% HZ
) * 1000000) / HZ
;
1074 lv
= sizeof(struct timeval
);
1075 if (sk
->sk_sndtimeo
== MAX_SCHEDULE_TIMEOUT
) {
1079 v
.tm
.tv_sec
= sk
->sk_sndtimeo
/ HZ
;
1080 v
.tm
.tv_usec
= ((sk
->sk_sndtimeo
% HZ
) * 1000000) / HZ
;
1085 v
.val
= sk
->sk_rcvlowat
;
1093 v
.val
= !!test_bit(SOCK_PASSCRED
, &sock
->flags
);
1098 struct ucred peercred
;
1099 if (len
> sizeof(peercred
))
1100 len
= sizeof(peercred
);
1101 cred_to_ucred(sk
->sk_peer_pid
, sk
->sk_peer_cred
, &peercred
);
1102 if (copy_to_user(optval
, &peercred
, len
))
1111 if (sock
->ops
->getname(sock
, (struct sockaddr
*)address
, &lv
, 2))
1115 if (copy_to_user(optval
, address
, len
))
1120 /* Dubious BSD thing... Probably nobody even uses it, but
1121 * the UNIX standard wants it for whatever reason... -DaveM
1124 v
.val
= sk
->sk_state
== TCP_LISTEN
;
1128 v
.val
= !!test_bit(SOCK_PASSSEC
, &sock
->flags
);
1132 return security_socket_getpeersec_stream(sock
, optval
, optlen
, len
);
1135 v
.val
= sk
->sk_mark
;
1139 v
.val
= sock_flag(sk
, SOCK_RXQ_OVFL
);
1142 case SO_WIFI_STATUS
:
1143 v
.val
= sock_flag(sk
, SOCK_WIFI_STATUS
);
1147 if (!sock
->ops
->set_peek_off
)
1150 v
.val
= sk
->sk_peek_off
;
1153 v
.val
= sock_flag(sk
, SOCK_NOFCS
);
1156 case SO_BINDTODEVICE
:
1157 return sock_getbindtodevice(sk
, optval
, optlen
, len
);
1160 len
= sk_get_filter(sk
, (struct sock_filter __user
*)optval
, len
);
1166 case SO_LOCK_FILTER
:
1167 v
.val
= sock_flag(sk
, SOCK_FILTER_LOCKED
);
1170 case SO_SELECT_ERR_QUEUE
:
1171 v
.val
= sock_flag(sk
, SOCK_SELECT_ERR_QUEUE
);
1174 #ifdef CONFIG_NET_RX_BUSY_POLL
1176 v
.val
= sk
->sk_ll_usec
;
1180 case SO_MAX_PACING_RATE
:
1181 v
.val
= sk
->sk_max_pacing_rate
;
1185 return -ENOPROTOOPT
;
1190 if (copy_to_user(optval
, &v
, len
))
1193 if (put_user(len
, optlen
))
1199 * Initialize an sk_lock.
1201 * (We also register the sk_lock with the lock validator.)
1203 static inline void sock_lock_init(struct sock
*sk
)
1205 sock_lock_init_class_and_name(sk
,
1206 af_family_slock_key_strings
[sk
->sk_family
],
1207 af_family_slock_keys
+ sk
->sk_family
,
1208 af_family_key_strings
[sk
->sk_family
],
1209 af_family_keys
+ sk
->sk_family
);
1213 * Copy all fields from osk to nsk but nsk->sk_refcnt must not change yet,
1214 * even temporarly, because of RCU lookups. sk_node should also be left as is.
1215 * We must not copy fields between sk_dontcopy_begin and sk_dontcopy_end
1217 static void sock_copy(struct sock
*nsk
, const struct sock
*osk
)
1219 #ifdef CONFIG_SECURITY_NETWORK
1220 void *sptr
= nsk
->sk_security
;
1222 memcpy(nsk
, osk
, offsetof(struct sock
, sk_dontcopy_begin
));
1224 memcpy(&nsk
->sk_dontcopy_end
, &osk
->sk_dontcopy_end
,
1225 osk
->sk_prot
->obj_size
- offsetof(struct sock
, sk_dontcopy_end
));
1227 #ifdef CONFIG_SECURITY_NETWORK
1228 nsk
->sk_security
= sptr
;
1229 security_sk_clone(osk
, nsk
);
1233 void sk_prot_clear_portaddr_nulls(struct sock
*sk
, int size
)
1235 unsigned long nulls1
, nulls2
;
1237 nulls1
= offsetof(struct sock
, __sk_common
.skc_node
.next
);
1238 nulls2
= offsetof(struct sock
, __sk_common
.skc_portaddr_node
.next
);
1239 if (nulls1
> nulls2
)
1240 swap(nulls1
, nulls2
);
1243 memset((char *)sk
, 0, nulls1
);
1244 memset((char *)sk
+ nulls1
+ sizeof(void *), 0,
1245 nulls2
- nulls1
- sizeof(void *));
1246 memset((char *)sk
+ nulls2
+ sizeof(void *), 0,
1247 size
- nulls2
- sizeof(void *));
1249 EXPORT_SYMBOL(sk_prot_clear_portaddr_nulls
);
1251 static struct sock
*sk_prot_alloc(struct proto
*prot
, gfp_t priority
,
1255 struct kmem_cache
*slab
;
1259 sk
= kmem_cache_alloc(slab
, priority
& ~__GFP_ZERO
);
1262 if (priority
& __GFP_ZERO
) {
1264 prot
->clear_sk(sk
, prot
->obj_size
);
1266 sk_prot_clear_nulls(sk
, prot
->obj_size
);
1269 sk
= kmalloc(prot
->obj_size
, priority
);
1272 kmemcheck_annotate_bitfield(sk
, flags
);
1274 if (security_sk_alloc(sk
, family
, priority
))
1277 if (!try_module_get(prot
->owner
))
1279 sk_tx_queue_clear(sk
);
1285 security_sk_free(sk
);
1288 kmem_cache_free(slab
, sk
);
1294 static void sk_prot_free(struct proto
*prot
, struct sock
*sk
)
1296 struct kmem_cache
*slab
;
1297 struct module
*owner
;
1299 owner
= prot
->owner
;
1302 security_sk_free(sk
);
1304 kmem_cache_free(slab
, sk
);
1310 #if IS_ENABLED(CONFIG_CGROUP_NET_PRIO)
1311 void sock_update_netprioidx(struct sock
*sk
)
1316 sk
->sk_cgrp_prioidx
= task_netprioidx(current
);
1318 EXPORT_SYMBOL_GPL(sock_update_netprioidx
);
1322 * sk_alloc - All socket objects are allocated here
1323 * @net: the applicable net namespace
1324 * @family: protocol family
1325 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
1326 * @prot: struct proto associated with this new sock instance
1328 struct sock
*sk_alloc(struct net
*net
, int family
, gfp_t priority
,
1333 sk
= sk_prot_alloc(prot
, priority
| __GFP_ZERO
, family
);
1335 sk
->sk_family
= family
;
1337 * See comment in struct sock definition to understand
1338 * why we need sk_prot_creator -acme
1340 sk
->sk_prot
= sk
->sk_prot_creator
= prot
;
1342 sock_net_set(sk
, get_net(net
));
1343 atomic_set(&sk
->sk_wmem_alloc
, 1);
1345 sock_update_classid(sk
);
1346 sock_update_netprioidx(sk
);
1351 EXPORT_SYMBOL(sk_alloc
);
1353 static void __sk_free(struct sock
*sk
)
1355 struct sk_filter
*filter
;
1357 if (sk
->sk_destruct
)
1358 sk
->sk_destruct(sk
);
1360 filter
= rcu_dereference_check(sk
->sk_filter
,
1361 atomic_read(&sk
->sk_wmem_alloc
) == 0);
1363 sk_filter_uncharge(sk
, filter
);
1364 RCU_INIT_POINTER(sk
->sk_filter
, NULL
);
1367 sock_disable_timestamp(sk
, SK_FLAGS_TIMESTAMP
);
1369 if (atomic_read(&sk
->sk_omem_alloc
))
1370 pr_debug("%s: optmem leakage (%d bytes) detected\n",
1371 __func__
, atomic_read(&sk
->sk_omem_alloc
));
1373 if (sk
->sk_peer_cred
)
1374 put_cred(sk
->sk_peer_cred
);
1375 put_pid(sk
->sk_peer_pid
);
1376 put_net(sock_net(sk
));
1377 sk_prot_free(sk
->sk_prot_creator
, sk
);
1380 void sk_free(struct sock
*sk
)
1383 * We subtract one from sk_wmem_alloc and can know if
1384 * some packets are still in some tx queue.
1385 * If not null, sock_wfree() will call __sk_free(sk) later
1387 if (atomic_dec_and_test(&sk
->sk_wmem_alloc
))
1390 EXPORT_SYMBOL(sk_free
);
1393 * Last sock_put should drop reference to sk->sk_net. It has already
1394 * been dropped in sk_change_net. Taking reference to stopping namespace
1396 * Take reference to a socket to remove it from hash _alive_ and after that
1397 * destroy it in the context of init_net.
1399 void sk_release_kernel(struct sock
*sk
)
1401 if (sk
== NULL
|| sk
->sk_socket
== NULL
)
1405 sock_release(sk
->sk_socket
);
1406 release_net(sock_net(sk
));
1407 sock_net_set(sk
, get_net(&init_net
));
1410 EXPORT_SYMBOL(sk_release_kernel
);
1412 static void sk_update_clone(const struct sock
*sk
, struct sock
*newsk
)
1414 if (mem_cgroup_sockets_enabled
&& sk
->sk_cgrp
)
1415 sock_update_memcg(newsk
);
1419 * sk_clone_lock - clone a socket, and lock its clone
1420 * @sk: the socket to clone
1421 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
1423 * Caller must unlock socket even in error path (bh_unlock_sock(newsk))
1425 struct sock
*sk_clone_lock(const struct sock
*sk
, const gfp_t priority
)
1429 newsk
= sk_prot_alloc(sk
->sk_prot
, priority
, sk
->sk_family
);
1430 if (newsk
!= NULL
) {
1431 struct sk_filter
*filter
;
1433 sock_copy(newsk
, sk
);
1436 get_net(sock_net(newsk
));
1437 sk_node_init(&newsk
->sk_node
);
1438 sock_lock_init(newsk
);
1439 bh_lock_sock(newsk
);
1440 newsk
->sk_backlog
.head
= newsk
->sk_backlog
.tail
= NULL
;
1441 newsk
->sk_backlog
.len
= 0;
1443 atomic_set(&newsk
->sk_rmem_alloc
, 0);
1445 * sk_wmem_alloc set to one (see sk_free() and sock_wfree())
1447 atomic_set(&newsk
->sk_wmem_alloc
, 1);
1448 atomic_set(&newsk
->sk_omem_alloc
, 0);
1449 skb_queue_head_init(&newsk
->sk_receive_queue
);
1450 skb_queue_head_init(&newsk
->sk_write_queue
);
1451 #ifdef CONFIG_NET_DMA
1452 skb_queue_head_init(&newsk
->sk_async_wait_queue
);
1455 spin_lock_init(&newsk
->sk_dst_lock
);
1456 rwlock_init(&newsk
->sk_callback_lock
);
1457 lockdep_set_class_and_name(&newsk
->sk_callback_lock
,
1458 af_callback_keys
+ newsk
->sk_family
,
1459 af_family_clock_key_strings
[newsk
->sk_family
]);
1461 newsk
->sk_dst_cache
= NULL
;
1462 newsk
->sk_wmem_queued
= 0;
1463 newsk
->sk_forward_alloc
= 0;
1464 newsk
->sk_send_head
= NULL
;
1465 newsk
->sk_userlocks
= sk
->sk_userlocks
& ~SOCK_BINDPORT_LOCK
;
1467 sock_reset_flag(newsk
, SOCK_DONE
);
1468 skb_queue_head_init(&newsk
->sk_error_queue
);
1470 filter
= rcu_dereference_protected(newsk
->sk_filter
, 1);
1472 sk_filter_charge(newsk
, filter
);
1474 if (unlikely(xfrm_sk_clone_policy(newsk
))) {
1475 /* It is still raw copy of parent, so invalidate
1476 * destructor and make plain sk_free() */
1477 newsk
->sk_destruct
= NULL
;
1478 bh_unlock_sock(newsk
);
1485 newsk
->sk_priority
= 0;
1487 * Before updating sk_refcnt, we must commit prior changes to memory
1488 * (Documentation/RCU/rculist_nulls.txt for details)
1491 atomic_set(&newsk
->sk_refcnt
, 2);
1494 * Increment the counter in the same struct proto as the master
1495 * sock (sk_refcnt_debug_inc uses newsk->sk_prot->socks, that
1496 * is the same as sk->sk_prot->socks, as this field was copied
1499 * This _changes_ the previous behaviour, where
1500 * tcp_create_openreq_child always was incrementing the
1501 * equivalent to tcp_prot->socks (inet_sock_nr), so this have
1502 * to be taken into account in all callers. -acme
1504 sk_refcnt_debug_inc(newsk
);
1505 sk_set_socket(newsk
, NULL
);
1506 newsk
->sk_wq
= NULL
;
1508 sk_update_clone(sk
, newsk
);
1510 if (newsk
->sk_prot
->sockets_allocated
)
1511 sk_sockets_allocated_inc(newsk
);
1513 if (newsk
->sk_flags
& SK_FLAGS_TIMESTAMP
)
1514 net_enable_timestamp();
1519 EXPORT_SYMBOL_GPL(sk_clone_lock
);
1521 void sk_setup_caps(struct sock
*sk
, struct dst_entry
*dst
)
1523 __sk_dst_set(sk
, dst
);
1524 sk
->sk_route_caps
= dst
->dev
->features
;
1525 if (sk
->sk_route_caps
& NETIF_F_GSO
)
1526 sk
->sk_route_caps
|= NETIF_F_GSO_SOFTWARE
;
1527 sk
->sk_route_caps
&= ~sk
->sk_route_nocaps
;
1528 if (sk_can_gso(sk
)) {
1529 if (dst
->header_len
) {
1530 sk
->sk_route_caps
&= ~NETIF_F_GSO_MASK
;
1532 sk
->sk_route_caps
|= NETIF_F_SG
| NETIF_F_HW_CSUM
;
1533 sk
->sk_gso_max_size
= dst
->dev
->gso_max_size
;
1534 sk
->sk_gso_max_segs
= dst
->dev
->gso_max_segs
;
1538 EXPORT_SYMBOL_GPL(sk_setup_caps
);
1541 * Simple resource managers for sockets.
1546 * Write buffer destructor automatically called from kfree_skb.
1548 void sock_wfree(struct sk_buff
*skb
)
1550 struct sock
*sk
= skb
->sk
;
1551 unsigned int len
= skb
->truesize
;
1553 if (!sock_flag(sk
, SOCK_USE_WRITE_QUEUE
)) {
1555 * Keep a reference on sk_wmem_alloc, this will be released
1556 * after sk_write_space() call
1558 atomic_sub(len
- 1, &sk
->sk_wmem_alloc
);
1559 sk
->sk_write_space(sk
);
1563 * if sk_wmem_alloc reaches 0, we must finish what sk_free()
1564 * could not do because of in-flight packets
1566 if (atomic_sub_and_test(len
, &sk
->sk_wmem_alloc
))
1569 EXPORT_SYMBOL(sock_wfree
);
1571 void skb_orphan_partial(struct sk_buff
*skb
)
1573 /* TCP stack sets skb->ooo_okay based on sk_wmem_alloc,
1574 * so we do not completely orphan skb, but transfert all
1575 * accounted bytes but one, to avoid unexpected reorders.
1577 if (skb
->destructor
== sock_wfree
1579 || skb
->destructor
== tcp_wfree
1582 atomic_sub(skb
->truesize
- 1, &skb
->sk
->sk_wmem_alloc
);
1588 EXPORT_SYMBOL(skb_orphan_partial
);
1591 * Read buffer destructor automatically called from kfree_skb.
1593 void sock_rfree(struct sk_buff
*skb
)
1595 struct sock
*sk
= skb
->sk
;
1596 unsigned int len
= skb
->truesize
;
1598 atomic_sub(len
, &sk
->sk_rmem_alloc
);
1599 sk_mem_uncharge(sk
, len
);
1601 EXPORT_SYMBOL(sock_rfree
);
1603 void sock_edemux(struct sk_buff
*skb
)
1605 struct sock
*sk
= skb
->sk
;
1608 if (sk
->sk_state
== TCP_TIME_WAIT
)
1609 inet_twsk_put(inet_twsk(sk
));
1614 EXPORT_SYMBOL(sock_edemux
);
1616 kuid_t
sock_i_uid(struct sock
*sk
)
1620 read_lock_bh(&sk
->sk_callback_lock
);
1621 uid
= sk
->sk_socket
? SOCK_INODE(sk
->sk_socket
)->i_uid
: GLOBAL_ROOT_UID
;
1622 read_unlock_bh(&sk
->sk_callback_lock
);
1625 EXPORT_SYMBOL(sock_i_uid
);
1627 unsigned long sock_i_ino(struct sock
*sk
)
1631 read_lock_bh(&sk
->sk_callback_lock
);
1632 ino
= sk
->sk_socket
? SOCK_INODE(sk
->sk_socket
)->i_ino
: 0;
1633 read_unlock_bh(&sk
->sk_callback_lock
);
1636 EXPORT_SYMBOL(sock_i_ino
);
1639 * Allocate a skb from the socket's send buffer.
1641 struct sk_buff
*sock_wmalloc(struct sock
*sk
, unsigned long size
, int force
,
1644 if (force
|| atomic_read(&sk
->sk_wmem_alloc
) < sk
->sk_sndbuf
) {
1645 struct sk_buff
*skb
= alloc_skb(size
, priority
);
1647 skb_set_owner_w(skb
, sk
);
1653 EXPORT_SYMBOL(sock_wmalloc
);
1656 * Allocate a memory block from the socket's option memory buffer.
1658 void *sock_kmalloc(struct sock
*sk
, int size
, gfp_t priority
)
1660 if ((unsigned int)size
<= sysctl_optmem_max
&&
1661 atomic_read(&sk
->sk_omem_alloc
) + size
< sysctl_optmem_max
) {
1663 /* First do the add, to avoid the race if kmalloc
1666 atomic_add(size
, &sk
->sk_omem_alloc
);
1667 mem
= kmalloc(size
, priority
);
1670 atomic_sub(size
, &sk
->sk_omem_alloc
);
1674 EXPORT_SYMBOL(sock_kmalloc
);
1677 * Free an option memory block.
1679 void sock_kfree_s(struct sock
*sk
, void *mem
, int size
)
1682 atomic_sub(size
, &sk
->sk_omem_alloc
);
1684 EXPORT_SYMBOL(sock_kfree_s
);
1686 /* It is almost wait_for_tcp_memory minus release_sock/lock_sock.
1687 I think, these locks should be removed for datagram sockets.
1689 static long sock_wait_for_wmem(struct sock
*sk
, long timeo
)
1693 clear_bit(SOCK_ASYNC_NOSPACE
, &sk
->sk_socket
->flags
);
1697 if (signal_pending(current
))
1699 set_bit(SOCK_NOSPACE
, &sk
->sk_socket
->flags
);
1700 prepare_to_wait(sk_sleep(sk
), &wait
, TASK_INTERRUPTIBLE
);
1701 if (atomic_read(&sk
->sk_wmem_alloc
) < sk
->sk_sndbuf
)
1703 if (sk
->sk_shutdown
& SEND_SHUTDOWN
)
1707 timeo
= schedule_timeout(timeo
);
1709 finish_wait(sk_sleep(sk
), &wait
);
1715 * Generic send/receive buffer handlers
1718 struct sk_buff
*sock_alloc_send_pskb(struct sock
*sk
, unsigned long header_len
,
1719 unsigned long data_len
, int noblock
,
1720 int *errcode
, int max_page_order
)
1722 struct sk_buff
*skb
= NULL
;
1723 unsigned long chunk
;
1727 int npages
= (data_len
+ (PAGE_SIZE
- 1)) >> PAGE_SHIFT
;
1732 if (npages
> MAX_SKB_FRAGS
)
1735 timeo
= sock_sndtimeo(sk
, noblock
);
1737 err
= sock_error(sk
);
1742 if (sk
->sk_shutdown
& SEND_SHUTDOWN
)
1745 if (atomic_read(&sk
->sk_wmem_alloc
) >= sk
->sk_sndbuf
) {
1746 set_bit(SOCK_ASYNC_NOSPACE
, &sk
->sk_socket
->flags
);
1747 set_bit(SOCK_NOSPACE
, &sk
->sk_socket
->flags
);
1751 if (signal_pending(current
))
1753 timeo
= sock_wait_for_wmem(sk
, timeo
);
1758 gfp_mask
= sk
->sk_allocation
;
1759 if (gfp_mask
& __GFP_WAIT
)
1760 gfp_mask
|= __GFP_REPEAT
;
1762 skb
= alloc_skb(header_len
, gfp_mask
);
1766 skb
->truesize
+= data_len
;
1768 for (i
= 0; npages
> 0; i
++) {
1769 int order
= max_page_order
;
1772 if (npages
>= 1 << order
) {
1773 page
= alloc_pages(sk
->sk_allocation
|
1774 __GFP_COMP
| __GFP_NOWARN
,
1781 page
= alloc_page(sk
->sk_allocation
);
1785 chunk
= min_t(unsigned long, data_len
,
1786 PAGE_SIZE
<< order
);
1787 skb_fill_page_desc(skb
, i
, page
, 0, chunk
);
1789 npages
-= 1 << order
;
1793 skb_set_owner_w(skb
, sk
);
1797 err
= sock_intr_errno(timeo
);
1803 EXPORT_SYMBOL(sock_alloc_send_pskb
);
1805 struct sk_buff
*sock_alloc_send_skb(struct sock
*sk
, unsigned long size
,
1806 int noblock
, int *errcode
)
1808 return sock_alloc_send_pskb(sk
, size
, 0, noblock
, errcode
, 0);
1810 EXPORT_SYMBOL(sock_alloc_send_skb
);
1812 /* On 32bit arches, an skb frag is limited to 2^15 */
1813 #define SKB_FRAG_PAGE_ORDER get_order(32768)
1816 * skb_page_frag_refill - check that a page_frag contains enough room
1817 * @sz: minimum size of the fragment we want to get
1818 * @pfrag: pointer to page_frag
1819 * @prio: priority for memory allocation
1821 * Note: While this allocator tries to use high order pages, there is
1822 * no guarantee that allocations succeed. Therefore, @sz MUST be
1823 * less or equal than PAGE_SIZE.
1825 bool skb_page_frag_refill(unsigned int sz
, struct page_frag
*pfrag
, gfp_t prio
)
1830 if (atomic_read(&pfrag
->page
->_count
) == 1) {
1834 if (pfrag
->offset
+ sz
<= pfrag
->size
)
1836 put_page(pfrag
->page
);
1839 /* We restrict high order allocations to users that can afford to wait */
1840 order
= (prio
& __GFP_WAIT
) ? SKB_FRAG_PAGE_ORDER
: 0;
1846 gfp
|= __GFP_COMP
| __GFP_NOWARN
;
1847 pfrag
->page
= alloc_pages(gfp
, order
);
1848 if (likely(pfrag
->page
)) {
1850 pfrag
->size
= PAGE_SIZE
<< order
;
1853 } while (--order
>= 0);
1857 EXPORT_SYMBOL(skb_page_frag_refill
);
1859 bool sk_page_frag_refill(struct sock
*sk
, struct page_frag
*pfrag
)
1861 if (likely(skb_page_frag_refill(32U, pfrag
, sk
->sk_allocation
)))
1864 sk_enter_memory_pressure(sk
);
1865 sk_stream_moderate_sndbuf(sk
);
1868 EXPORT_SYMBOL(sk_page_frag_refill
);
1870 static void __lock_sock(struct sock
*sk
)
1871 __releases(&sk
->sk_lock
.slock
)
1872 __acquires(&sk
->sk_lock
.slock
)
1877 prepare_to_wait_exclusive(&sk
->sk_lock
.wq
, &wait
,
1878 TASK_UNINTERRUPTIBLE
);
1879 spin_unlock_bh(&sk
->sk_lock
.slock
);
1881 spin_lock_bh(&sk
->sk_lock
.slock
);
1882 if (!sock_owned_by_user(sk
))
1885 finish_wait(&sk
->sk_lock
.wq
, &wait
);
1888 static void __release_sock(struct sock
*sk
)
1889 __releases(&sk
->sk_lock
.slock
)
1890 __acquires(&sk
->sk_lock
.slock
)
1892 struct sk_buff
*skb
= sk
->sk_backlog
.head
;
1895 sk
->sk_backlog
.head
= sk
->sk_backlog
.tail
= NULL
;
1899 struct sk_buff
*next
= skb
->next
;
1902 WARN_ON_ONCE(skb_dst_is_noref(skb
));
1904 sk_backlog_rcv(sk
, skb
);
1907 * We are in process context here with softirqs
1908 * disabled, use cond_resched_softirq() to preempt.
1909 * This is safe to do because we've taken the backlog
1912 cond_resched_softirq();
1915 } while (skb
!= NULL
);
1918 } while ((skb
= sk
->sk_backlog
.head
) != NULL
);
1921 * Doing the zeroing here guarantee we can not loop forever
1922 * while a wild producer attempts to flood us.
1924 sk
->sk_backlog
.len
= 0;
1928 * sk_wait_data - wait for data to arrive at sk_receive_queue
1929 * @sk: sock to wait on
1930 * @timeo: for how long
1932 * Now socket state including sk->sk_err is changed only under lock,
1933 * hence we may omit checks after joining wait queue.
1934 * We check receive queue before schedule() only as optimization;
1935 * it is very likely that release_sock() added new data.
1937 int sk_wait_data(struct sock
*sk
, long *timeo
)
1942 prepare_to_wait(sk_sleep(sk
), &wait
, TASK_INTERRUPTIBLE
);
1943 set_bit(SOCK_ASYNC_WAITDATA
, &sk
->sk_socket
->flags
);
1944 rc
= sk_wait_event(sk
, timeo
, !skb_queue_empty(&sk
->sk_receive_queue
));
1945 clear_bit(SOCK_ASYNC_WAITDATA
, &sk
->sk_socket
->flags
);
1946 finish_wait(sk_sleep(sk
), &wait
);
1949 EXPORT_SYMBOL(sk_wait_data
);
1952 * __sk_mem_schedule - increase sk_forward_alloc and memory_allocated
1954 * @size: memory size to allocate
1955 * @kind: allocation type
1957 * If kind is SK_MEM_SEND, it means wmem allocation. Otherwise it means
1958 * rmem allocation. This function assumes that protocols which have
1959 * memory_pressure use sk_wmem_queued as write buffer accounting.
1961 int __sk_mem_schedule(struct sock
*sk
, int size
, int kind
)
1963 struct proto
*prot
= sk
->sk_prot
;
1964 int amt
= sk_mem_pages(size
);
1966 int parent_status
= UNDER_LIMIT
;
1968 sk
->sk_forward_alloc
+= amt
* SK_MEM_QUANTUM
;
1970 allocated
= sk_memory_allocated_add(sk
, amt
, &parent_status
);
1973 if (parent_status
== UNDER_LIMIT
&&
1974 allocated
<= sk_prot_mem_limits(sk
, 0)) {
1975 sk_leave_memory_pressure(sk
);
1979 /* Under pressure. (we or our parents) */
1980 if ((parent_status
> SOFT_LIMIT
) ||
1981 allocated
> sk_prot_mem_limits(sk
, 1))
1982 sk_enter_memory_pressure(sk
);
1984 /* Over hard limit (we or our parents) */
1985 if ((parent_status
== OVER_LIMIT
) ||
1986 (allocated
> sk_prot_mem_limits(sk
, 2)))
1987 goto suppress_allocation
;
1989 /* guarantee minimum buffer size under pressure */
1990 if (kind
== SK_MEM_RECV
) {
1991 if (atomic_read(&sk
->sk_rmem_alloc
) < prot
->sysctl_rmem
[0])
1994 } else { /* SK_MEM_SEND */
1995 if (sk
->sk_type
== SOCK_STREAM
) {
1996 if (sk
->sk_wmem_queued
< prot
->sysctl_wmem
[0])
1998 } else if (atomic_read(&sk
->sk_wmem_alloc
) <
1999 prot
->sysctl_wmem
[0])
2003 if (sk_has_memory_pressure(sk
)) {
2006 if (!sk_under_memory_pressure(sk
))
2008 alloc
= sk_sockets_allocated_read_positive(sk
);
2009 if (sk_prot_mem_limits(sk
, 2) > alloc
*
2010 sk_mem_pages(sk
->sk_wmem_queued
+
2011 atomic_read(&sk
->sk_rmem_alloc
) +
2012 sk
->sk_forward_alloc
))
2016 suppress_allocation
:
2018 if (kind
== SK_MEM_SEND
&& sk
->sk_type
== SOCK_STREAM
) {
2019 sk_stream_moderate_sndbuf(sk
);
2021 /* Fail only if socket is _under_ its sndbuf.
2022 * In this case we cannot block, so that we have to fail.
2024 if (sk
->sk_wmem_queued
+ size
>= sk
->sk_sndbuf
)
2028 trace_sock_exceed_buf_limit(sk
, prot
, allocated
);
2030 /* Alas. Undo changes. */
2031 sk
->sk_forward_alloc
-= amt
* SK_MEM_QUANTUM
;
2033 sk_memory_allocated_sub(sk
, amt
);
2037 EXPORT_SYMBOL(__sk_mem_schedule
);
2040 * __sk_reclaim - reclaim memory_allocated
2043 void __sk_mem_reclaim(struct sock
*sk
)
2045 sk_memory_allocated_sub(sk
,
2046 sk
->sk_forward_alloc
>> SK_MEM_QUANTUM_SHIFT
);
2047 sk
->sk_forward_alloc
&= SK_MEM_QUANTUM
- 1;
2049 if (sk_under_memory_pressure(sk
) &&
2050 (sk_memory_allocated(sk
) < sk_prot_mem_limits(sk
, 0)))
2051 sk_leave_memory_pressure(sk
);
2053 EXPORT_SYMBOL(__sk_mem_reclaim
);
2057 * Set of default routines for initialising struct proto_ops when
2058 * the protocol does not support a particular function. In certain
2059 * cases where it makes no sense for a protocol to have a "do nothing"
2060 * function, some default processing is provided.
2063 int sock_no_bind(struct socket
*sock
, struct sockaddr
*saddr
, int len
)
2067 EXPORT_SYMBOL(sock_no_bind
);
2069 int sock_no_connect(struct socket
*sock
, struct sockaddr
*saddr
,
2074 EXPORT_SYMBOL(sock_no_connect
);
2076 int sock_no_socketpair(struct socket
*sock1
, struct socket
*sock2
)
2080 EXPORT_SYMBOL(sock_no_socketpair
);
2082 int sock_no_accept(struct socket
*sock
, struct socket
*newsock
, int flags
)
2086 EXPORT_SYMBOL(sock_no_accept
);
2088 int sock_no_getname(struct socket
*sock
, struct sockaddr
*saddr
,
2093 EXPORT_SYMBOL(sock_no_getname
);
2095 unsigned int sock_no_poll(struct file
*file
, struct socket
*sock
, poll_table
*pt
)
2099 EXPORT_SYMBOL(sock_no_poll
);
2101 int sock_no_ioctl(struct socket
*sock
, unsigned int cmd
, unsigned long arg
)
2105 EXPORT_SYMBOL(sock_no_ioctl
);
2107 int sock_no_listen(struct socket
*sock
, int backlog
)
2111 EXPORT_SYMBOL(sock_no_listen
);
2113 int sock_no_shutdown(struct socket
*sock
, int how
)
2117 EXPORT_SYMBOL(sock_no_shutdown
);
2119 int sock_no_setsockopt(struct socket
*sock
, int level
, int optname
,
2120 char __user
*optval
, unsigned int optlen
)
2124 EXPORT_SYMBOL(sock_no_setsockopt
);
2126 int sock_no_getsockopt(struct socket
*sock
, int level
, int optname
,
2127 char __user
*optval
, int __user
*optlen
)
2131 EXPORT_SYMBOL(sock_no_getsockopt
);
2133 int sock_no_sendmsg(struct kiocb
*iocb
, struct socket
*sock
, struct msghdr
*m
,
2138 EXPORT_SYMBOL(sock_no_sendmsg
);
2140 int sock_no_recvmsg(struct kiocb
*iocb
, struct socket
*sock
, struct msghdr
*m
,
2141 size_t len
, int flags
)
2145 EXPORT_SYMBOL(sock_no_recvmsg
);
2147 int sock_no_mmap(struct file
*file
, struct socket
*sock
, struct vm_area_struct
*vma
)
2149 /* Mirror missing mmap method error code */
2152 EXPORT_SYMBOL(sock_no_mmap
);
2154 ssize_t
sock_no_sendpage(struct socket
*sock
, struct page
*page
, int offset
, size_t size
, int flags
)
2157 struct msghdr msg
= {.msg_flags
= flags
};
2159 char *kaddr
= kmap(page
);
2160 iov
.iov_base
= kaddr
+ offset
;
2162 res
= kernel_sendmsg(sock
, &msg
, &iov
, 1, size
);
2166 EXPORT_SYMBOL(sock_no_sendpage
);
2169 * Default Socket Callbacks
2172 static void sock_def_wakeup(struct sock
*sk
)
2174 struct socket_wq
*wq
;
2177 wq
= rcu_dereference(sk
->sk_wq
);
2178 if (wq_has_sleeper(wq
))
2179 wake_up_interruptible_all(&wq
->wait
);
2183 static void sock_def_error_report(struct sock
*sk
)
2185 struct socket_wq
*wq
;
2188 wq
= rcu_dereference(sk
->sk_wq
);
2189 if (wq_has_sleeper(wq
))
2190 wake_up_interruptible_poll(&wq
->wait
, POLLERR
);
2191 sk_wake_async(sk
, SOCK_WAKE_IO
, POLL_ERR
);
2195 static void sock_def_readable(struct sock
*sk
, int len
)
2197 struct socket_wq
*wq
;
2200 wq
= rcu_dereference(sk
->sk_wq
);
2201 if (wq_has_sleeper(wq
))
2202 wake_up_interruptible_sync_poll(&wq
->wait
, POLLIN
| POLLPRI
|
2203 POLLRDNORM
| POLLRDBAND
);
2204 sk_wake_async(sk
, SOCK_WAKE_WAITD
, POLL_IN
);
2208 static void sock_def_write_space(struct sock
*sk
)
2210 struct socket_wq
*wq
;
2214 /* Do not wake up a writer until he can make "significant"
2217 if ((atomic_read(&sk
->sk_wmem_alloc
) << 1) <= sk
->sk_sndbuf
) {
2218 wq
= rcu_dereference(sk
->sk_wq
);
2219 if (wq_has_sleeper(wq
))
2220 wake_up_interruptible_sync_poll(&wq
->wait
, POLLOUT
|
2221 POLLWRNORM
| POLLWRBAND
);
2223 /* Should agree with poll, otherwise some programs break */
2224 if (sock_writeable(sk
))
2225 sk_wake_async(sk
, SOCK_WAKE_SPACE
, POLL_OUT
);
2231 static void sock_def_destruct(struct sock
*sk
)
2233 kfree(sk
->sk_protinfo
);
2236 void sk_send_sigurg(struct sock
*sk
)
2238 if (sk
->sk_socket
&& sk
->sk_socket
->file
)
2239 if (send_sigurg(&sk
->sk_socket
->file
->f_owner
))
2240 sk_wake_async(sk
, SOCK_WAKE_URG
, POLL_PRI
);
2242 EXPORT_SYMBOL(sk_send_sigurg
);
2244 void sk_reset_timer(struct sock
*sk
, struct timer_list
* timer
,
2245 unsigned long expires
)
2247 if (!mod_timer(timer
, expires
))
2250 EXPORT_SYMBOL(sk_reset_timer
);
2252 void sk_stop_timer(struct sock
*sk
, struct timer_list
* timer
)
2254 if (del_timer(timer
))
2257 EXPORT_SYMBOL(sk_stop_timer
);
2259 void sock_init_data(struct socket
*sock
, struct sock
*sk
)
2261 skb_queue_head_init(&sk
->sk_receive_queue
);
2262 skb_queue_head_init(&sk
->sk_write_queue
);
2263 skb_queue_head_init(&sk
->sk_error_queue
);
2264 #ifdef CONFIG_NET_DMA
2265 skb_queue_head_init(&sk
->sk_async_wait_queue
);
2268 sk
->sk_send_head
= NULL
;
2270 init_timer(&sk
->sk_timer
);
2272 sk
->sk_allocation
= GFP_KERNEL
;
2273 sk
->sk_rcvbuf
= sysctl_rmem_default
;
2274 sk
->sk_sndbuf
= sysctl_wmem_default
;
2275 sk
->sk_state
= TCP_CLOSE
;
2276 sk_set_socket(sk
, sock
);
2278 sock_set_flag(sk
, SOCK_ZAPPED
);
2281 sk
->sk_type
= sock
->type
;
2282 sk
->sk_wq
= sock
->wq
;
2287 spin_lock_init(&sk
->sk_dst_lock
);
2288 rwlock_init(&sk
->sk_callback_lock
);
2289 lockdep_set_class_and_name(&sk
->sk_callback_lock
,
2290 af_callback_keys
+ sk
->sk_family
,
2291 af_family_clock_key_strings
[sk
->sk_family
]);
2293 sk
->sk_state_change
= sock_def_wakeup
;
2294 sk
->sk_data_ready
= sock_def_readable
;
2295 sk
->sk_write_space
= sock_def_write_space
;
2296 sk
->sk_error_report
= sock_def_error_report
;
2297 sk
->sk_destruct
= sock_def_destruct
;
2299 sk
->sk_frag
.page
= NULL
;
2300 sk
->sk_frag
.offset
= 0;
2301 sk
->sk_peek_off
= -1;
2303 sk
->sk_peer_pid
= NULL
;
2304 sk
->sk_peer_cred
= NULL
;
2305 sk
->sk_write_pending
= 0;
2306 sk
->sk_rcvlowat
= 1;
2307 sk
->sk_rcvtimeo
= MAX_SCHEDULE_TIMEOUT
;
2308 sk
->sk_sndtimeo
= MAX_SCHEDULE_TIMEOUT
;
2310 sk
->sk_stamp
= ktime_set(-1L, 0);
2312 #ifdef CONFIG_NET_RX_BUSY_POLL
2314 sk
->sk_ll_usec
= sysctl_net_busy_read
;
2317 sk
->sk_max_pacing_rate
= ~0U;
2318 sk
->sk_pacing_rate
= ~0U;
2320 * Before updating sk_refcnt, we must commit prior changes to memory
2321 * (Documentation/RCU/rculist_nulls.txt for details)
2324 atomic_set(&sk
->sk_refcnt
, 1);
2325 atomic_set(&sk
->sk_drops
, 0);
2327 EXPORT_SYMBOL(sock_init_data
);
2329 void lock_sock_nested(struct sock
*sk
, int subclass
)
2332 spin_lock_bh(&sk
->sk_lock
.slock
);
2333 if (sk
->sk_lock
.owned
)
2335 sk
->sk_lock
.owned
= 1;
2336 spin_unlock(&sk
->sk_lock
.slock
);
2338 * The sk_lock has mutex_lock() semantics here:
2340 mutex_acquire(&sk
->sk_lock
.dep_map
, subclass
, 0, _RET_IP_
);
2343 EXPORT_SYMBOL(lock_sock_nested
);
2345 void release_sock(struct sock
*sk
)
2348 * The sk_lock has mutex_unlock() semantics:
2350 mutex_release(&sk
->sk_lock
.dep_map
, 1, _RET_IP_
);
2352 spin_lock_bh(&sk
->sk_lock
.slock
);
2353 if (sk
->sk_backlog
.tail
)
2356 if (sk
->sk_prot
->release_cb
)
2357 sk
->sk_prot
->release_cb(sk
);
2359 sk
->sk_lock
.owned
= 0;
2360 if (waitqueue_active(&sk
->sk_lock
.wq
))
2361 wake_up(&sk
->sk_lock
.wq
);
2362 spin_unlock_bh(&sk
->sk_lock
.slock
);
2364 EXPORT_SYMBOL(release_sock
);
2367 * lock_sock_fast - fast version of lock_sock
2370 * This version should be used for very small section, where process wont block
2371 * return false if fast path is taken
2372 * sk_lock.slock locked, owned = 0, BH disabled
2373 * return true if slow path is taken
2374 * sk_lock.slock unlocked, owned = 1, BH enabled
2376 bool lock_sock_fast(struct sock
*sk
)
2379 spin_lock_bh(&sk
->sk_lock
.slock
);
2381 if (!sk
->sk_lock
.owned
)
2383 * Note : We must disable BH
2388 sk
->sk_lock
.owned
= 1;
2389 spin_unlock(&sk
->sk_lock
.slock
);
2391 * The sk_lock has mutex_lock() semantics here:
2393 mutex_acquire(&sk
->sk_lock
.dep_map
, 0, 0, _RET_IP_
);
2397 EXPORT_SYMBOL(lock_sock_fast
);
2399 int sock_get_timestamp(struct sock
*sk
, struct timeval __user
*userstamp
)
2402 if (!sock_flag(sk
, SOCK_TIMESTAMP
))
2403 sock_enable_timestamp(sk
, SOCK_TIMESTAMP
);
2404 tv
= ktime_to_timeval(sk
->sk_stamp
);
2405 if (tv
.tv_sec
== -1)
2407 if (tv
.tv_sec
== 0) {
2408 sk
->sk_stamp
= ktime_get_real();
2409 tv
= ktime_to_timeval(sk
->sk_stamp
);
2411 return copy_to_user(userstamp
, &tv
, sizeof(tv
)) ? -EFAULT
: 0;
2413 EXPORT_SYMBOL(sock_get_timestamp
);
2415 int sock_get_timestampns(struct sock
*sk
, struct timespec __user
*userstamp
)
2418 if (!sock_flag(sk
, SOCK_TIMESTAMP
))
2419 sock_enable_timestamp(sk
, SOCK_TIMESTAMP
);
2420 ts
= ktime_to_timespec(sk
->sk_stamp
);
2421 if (ts
.tv_sec
== -1)
2423 if (ts
.tv_sec
== 0) {
2424 sk
->sk_stamp
= ktime_get_real();
2425 ts
= ktime_to_timespec(sk
->sk_stamp
);
2427 return copy_to_user(userstamp
, &ts
, sizeof(ts
)) ? -EFAULT
: 0;
2429 EXPORT_SYMBOL(sock_get_timestampns
);
2431 void sock_enable_timestamp(struct sock
*sk
, int flag
)
2433 if (!sock_flag(sk
, flag
)) {
2434 unsigned long previous_flags
= sk
->sk_flags
;
2436 sock_set_flag(sk
, flag
);
2438 * we just set one of the two flags which require net
2439 * time stamping, but time stamping might have been on
2440 * already because of the other one
2442 if (!(previous_flags
& SK_FLAGS_TIMESTAMP
))
2443 net_enable_timestamp();
2447 int sock_recv_errqueue(struct sock
*sk
, struct msghdr
*msg
, int len
,
2448 int level
, int type
)
2450 struct sock_exterr_skb
*serr
;
2451 struct sk_buff
*skb
, *skb2
;
2455 skb
= skb_dequeue(&sk
->sk_error_queue
);
2461 msg
->msg_flags
|= MSG_TRUNC
;
2464 err
= skb_copy_datagram_iovec(skb
, 0, msg
->msg_iov
, copied
);
2468 sock_recv_timestamp(msg
, sk
, skb
);
2470 serr
= SKB_EXT_ERR(skb
);
2471 put_cmsg(msg
, level
, type
, sizeof(serr
->ee
), &serr
->ee
);
2473 msg
->msg_flags
|= MSG_ERRQUEUE
;
2476 /* Reset and regenerate socket error */
2477 spin_lock_bh(&sk
->sk_error_queue
.lock
);
2479 if ((skb2
= skb_peek(&sk
->sk_error_queue
)) != NULL
) {
2480 sk
->sk_err
= SKB_EXT_ERR(skb2
)->ee
.ee_errno
;
2481 spin_unlock_bh(&sk
->sk_error_queue
.lock
);
2482 sk
->sk_error_report(sk
);
2484 spin_unlock_bh(&sk
->sk_error_queue
.lock
);
2491 EXPORT_SYMBOL(sock_recv_errqueue
);
2494 * Get a socket option on an socket.
2496 * FIX: POSIX 1003.1g is very ambiguous here. It states that
2497 * asynchronous errors should be reported by getsockopt. We assume
2498 * this means if you specify SO_ERROR (otherwise whats the point of it).
2500 int sock_common_getsockopt(struct socket
*sock
, int level
, int optname
,
2501 char __user
*optval
, int __user
*optlen
)
2503 struct sock
*sk
= sock
->sk
;
2505 return sk
->sk_prot
->getsockopt(sk
, level
, optname
, optval
, optlen
);
2507 EXPORT_SYMBOL(sock_common_getsockopt
);
2509 #ifdef CONFIG_COMPAT
2510 int compat_sock_common_getsockopt(struct socket
*sock
, int level
, int optname
,
2511 char __user
*optval
, int __user
*optlen
)
2513 struct sock
*sk
= sock
->sk
;
2515 if (sk
->sk_prot
->compat_getsockopt
!= NULL
)
2516 return sk
->sk_prot
->compat_getsockopt(sk
, level
, optname
,
2518 return sk
->sk_prot
->getsockopt(sk
, level
, optname
, optval
, optlen
);
2520 EXPORT_SYMBOL(compat_sock_common_getsockopt
);
2523 int sock_common_recvmsg(struct kiocb
*iocb
, struct socket
*sock
,
2524 struct msghdr
*msg
, size_t size
, int flags
)
2526 struct sock
*sk
= sock
->sk
;
2530 err
= sk
->sk_prot
->recvmsg(iocb
, sk
, msg
, size
, flags
& MSG_DONTWAIT
,
2531 flags
& ~MSG_DONTWAIT
, &addr_len
);
2533 msg
->msg_namelen
= addr_len
;
2536 EXPORT_SYMBOL(sock_common_recvmsg
);
2539 * Set socket options on an inet socket.
2541 int sock_common_setsockopt(struct socket
*sock
, int level
, int optname
,
2542 char __user
*optval
, unsigned int optlen
)
2544 struct sock
*sk
= sock
->sk
;
2546 return sk
->sk_prot
->setsockopt(sk
, level
, optname
, optval
, optlen
);
2548 EXPORT_SYMBOL(sock_common_setsockopt
);
2550 #ifdef CONFIG_COMPAT
2551 int compat_sock_common_setsockopt(struct socket
*sock
, int level
, int optname
,
2552 char __user
*optval
, unsigned int optlen
)
2554 struct sock
*sk
= sock
->sk
;
2556 if (sk
->sk_prot
->compat_setsockopt
!= NULL
)
2557 return sk
->sk_prot
->compat_setsockopt(sk
, level
, optname
,
2559 return sk
->sk_prot
->setsockopt(sk
, level
, optname
, optval
, optlen
);
2561 EXPORT_SYMBOL(compat_sock_common_setsockopt
);
2564 void sk_common_release(struct sock
*sk
)
2566 if (sk
->sk_prot
->destroy
)
2567 sk
->sk_prot
->destroy(sk
);
2570 * Observation: when sock_common_release is called, processes have
2571 * no access to socket. But net still has.
2572 * Step one, detach it from networking:
2574 * A. Remove from hash tables.
2577 sk
->sk_prot
->unhash(sk
);
2580 * In this point socket cannot receive new packets, but it is possible
2581 * that some packets are in flight because some CPU runs receiver and
2582 * did hash table lookup before we unhashed socket. They will achieve
2583 * receive queue and will be purged by socket destructor.
2585 * Also we still have packets pending on receive queue and probably,
2586 * our own packets waiting in device queues. sock_destroy will drain
2587 * receive queue, but transmitted packets will delay socket destruction
2588 * until the last reference will be released.
2593 xfrm_sk_free_policy(sk
);
2595 sk_refcnt_debug_release(sk
);
2597 if (sk
->sk_frag
.page
) {
2598 put_page(sk
->sk_frag
.page
);
2599 sk
->sk_frag
.page
= NULL
;
2604 EXPORT_SYMBOL(sk_common_release
);
2606 #ifdef CONFIG_PROC_FS
2607 #define PROTO_INUSE_NR 64 /* should be enough for the first time */
2609 int val
[PROTO_INUSE_NR
];
2612 static DECLARE_BITMAP(proto_inuse_idx
, PROTO_INUSE_NR
);
2614 #ifdef CONFIG_NET_NS
2615 void sock_prot_inuse_add(struct net
*net
, struct proto
*prot
, int val
)
2617 __this_cpu_add(net
->core
.inuse
->val
[prot
->inuse_idx
], val
);
2619 EXPORT_SYMBOL_GPL(sock_prot_inuse_add
);
2621 int sock_prot_inuse_get(struct net
*net
, struct proto
*prot
)
2623 int cpu
, idx
= prot
->inuse_idx
;
2626 for_each_possible_cpu(cpu
)
2627 res
+= per_cpu_ptr(net
->core
.inuse
, cpu
)->val
[idx
];
2629 return res
>= 0 ? res
: 0;
2631 EXPORT_SYMBOL_GPL(sock_prot_inuse_get
);
2633 static int __net_init
sock_inuse_init_net(struct net
*net
)
2635 net
->core
.inuse
= alloc_percpu(struct prot_inuse
);
2636 return net
->core
.inuse
? 0 : -ENOMEM
;
2639 static void __net_exit
sock_inuse_exit_net(struct net
*net
)
2641 free_percpu(net
->core
.inuse
);
2644 static struct pernet_operations net_inuse_ops
= {
2645 .init
= sock_inuse_init_net
,
2646 .exit
= sock_inuse_exit_net
,
2649 static __init
int net_inuse_init(void)
2651 if (register_pernet_subsys(&net_inuse_ops
))
2652 panic("Cannot initialize net inuse counters");
2657 core_initcall(net_inuse_init
);
2659 static DEFINE_PER_CPU(struct prot_inuse
, prot_inuse
);
2661 void sock_prot_inuse_add(struct net
*net
, struct proto
*prot
, int val
)
2663 __this_cpu_add(prot_inuse
.val
[prot
->inuse_idx
], val
);
2665 EXPORT_SYMBOL_GPL(sock_prot_inuse_add
);
2667 int sock_prot_inuse_get(struct net
*net
, struct proto
*prot
)
2669 int cpu
, idx
= prot
->inuse_idx
;
2672 for_each_possible_cpu(cpu
)
2673 res
+= per_cpu(prot_inuse
, cpu
).val
[idx
];
2675 return res
>= 0 ? res
: 0;
2677 EXPORT_SYMBOL_GPL(sock_prot_inuse_get
);
2680 static void assign_proto_idx(struct proto
*prot
)
2682 prot
->inuse_idx
= find_first_zero_bit(proto_inuse_idx
, PROTO_INUSE_NR
);
2684 if (unlikely(prot
->inuse_idx
== PROTO_INUSE_NR
- 1)) {
2685 pr_err("PROTO_INUSE_NR exhausted\n");
2689 set_bit(prot
->inuse_idx
, proto_inuse_idx
);
2692 static void release_proto_idx(struct proto
*prot
)
2694 if (prot
->inuse_idx
!= PROTO_INUSE_NR
- 1)
2695 clear_bit(prot
->inuse_idx
, proto_inuse_idx
);
2698 static inline void assign_proto_idx(struct proto
*prot
)
2702 static inline void release_proto_idx(struct proto
*prot
)
2707 int proto_register(struct proto
*prot
, int alloc_slab
)
2710 prot
->slab
= kmem_cache_create(prot
->name
, prot
->obj_size
, 0,
2711 SLAB_HWCACHE_ALIGN
| prot
->slab_flags
,
2714 if (prot
->slab
== NULL
) {
2715 pr_crit("%s: Can't create sock SLAB cache!\n",
2720 if (prot
->rsk_prot
!= NULL
) {
2721 prot
->rsk_prot
->slab_name
= kasprintf(GFP_KERNEL
, "request_sock_%s", prot
->name
);
2722 if (prot
->rsk_prot
->slab_name
== NULL
)
2723 goto out_free_sock_slab
;
2725 prot
->rsk_prot
->slab
= kmem_cache_create(prot
->rsk_prot
->slab_name
,
2726 prot
->rsk_prot
->obj_size
, 0,
2727 SLAB_HWCACHE_ALIGN
, NULL
);
2729 if (prot
->rsk_prot
->slab
== NULL
) {
2730 pr_crit("%s: Can't create request sock SLAB cache!\n",
2732 goto out_free_request_sock_slab_name
;
2736 if (prot
->twsk_prot
!= NULL
) {
2737 prot
->twsk_prot
->twsk_slab_name
= kasprintf(GFP_KERNEL
, "tw_sock_%s", prot
->name
);
2739 if (prot
->twsk_prot
->twsk_slab_name
== NULL
)
2740 goto out_free_request_sock_slab
;
2742 prot
->twsk_prot
->twsk_slab
=
2743 kmem_cache_create(prot
->twsk_prot
->twsk_slab_name
,
2744 prot
->twsk_prot
->twsk_obj_size
,
2746 SLAB_HWCACHE_ALIGN
|
2749 if (prot
->twsk_prot
->twsk_slab
== NULL
)
2750 goto out_free_timewait_sock_slab_name
;
2754 mutex_lock(&proto_list_mutex
);
2755 list_add(&prot
->node
, &proto_list
);
2756 assign_proto_idx(prot
);
2757 mutex_unlock(&proto_list_mutex
);
2760 out_free_timewait_sock_slab_name
:
2761 kfree(prot
->twsk_prot
->twsk_slab_name
);
2762 out_free_request_sock_slab
:
2763 if (prot
->rsk_prot
&& prot
->rsk_prot
->slab
) {
2764 kmem_cache_destroy(prot
->rsk_prot
->slab
);
2765 prot
->rsk_prot
->slab
= NULL
;
2767 out_free_request_sock_slab_name
:
2769 kfree(prot
->rsk_prot
->slab_name
);
2771 kmem_cache_destroy(prot
->slab
);
2776 EXPORT_SYMBOL(proto_register
);
2778 void proto_unregister(struct proto
*prot
)
2780 mutex_lock(&proto_list_mutex
);
2781 release_proto_idx(prot
);
2782 list_del(&prot
->node
);
2783 mutex_unlock(&proto_list_mutex
);
2785 if (prot
->slab
!= NULL
) {
2786 kmem_cache_destroy(prot
->slab
);
2790 if (prot
->rsk_prot
!= NULL
&& prot
->rsk_prot
->slab
!= NULL
) {
2791 kmem_cache_destroy(prot
->rsk_prot
->slab
);
2792 kfree(prot
->rsk_prot
->slab_name
);
2793 prot
->rsk_prot
->slab
= NULL
;
2796 if (prot
->twsk_prot
!= NULL
&& prot
->twsk_prot
->twsk_slab
!= NULL
) {
2797 kmem_cache_destroy(prot
->twsk_prot
->twsk_slab
);
2798 kfree(prot
->twsk_prot
->twsk_slab_name
);
2799 prot
->twsk_prot
->twsk_slab
= NULL
;
2802 EXPORT_SYMBOL(proto_unregister
);
2804 #ifdef CONFIG_PROC_FS
2805 static void *proto_seq_start(struct seq_file
*seq
, loff_t
*pos
)
2806 __acquires(proto_list_mutex
)
2808 mutex_lock(&proto_list_mutex
);
2809 return seq_list_start_head(&proto_list
, *pos
);
2812 static void *proto_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
2814 return seq_list_next(v
, &proto_list
, pos
);
2817 static void proto_seq_stop(struct seq_file
*seq
, void *v
)
2818 __releases(proto_list_mutex
)
2820 mutex_unlock(&proto_list_mutex
);
2823 static char proto_method_implemented(const void *method
)
2825 return method
== NULL
? 'n' : 'y';
2827 static long sock_prot_memory_allocated(struct proto
*proto
)
2829 return proto
->memory_allocated
!= NULL
? proto_memory_allocated(proto
) : -1L;
2832 static char *sock_prot_memory_pressure(struct proto
*proto
)
2834 return proto
->memory_pressure
!= NULL
?
2835 proto_memory_pressure(proto
) ? "yes" : "no" : "NI";
2838 static void proto_seq_printf(struct seq_file
*seq
, struct proto
*proto
)
2841 seq_printf(seq
, "%-9s %4u %6d %6ld %-3s %6u %-3s %-10s "
2842 "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n",
2845 sock_prot_inuse_get(seq_file_net(seq
), proto
),
2846 sock_prot_memory_allocated(proto
),
2847 sock_prot_memory_pressure(proto
),
2849 proto
->slab
== NULL
? "no" : "yes",
2850 module_name(proto
->owner
),
2851 proto_method_implemented(proto
->close
),
2852 proto_method_implemented(proto
->connect
),
2853 proto_method_implemented(proto
->disconnect
),
2854 proto_method_implemented(proto
->accept
),
2855 proto_method_implemented(proto
->ioctl
),
2856 proto_method_implemented(proto
->init
),
2857 proto_method_implemented(proto
->destroy
),
2858 proto_method_implemented(proto
->shutdown
),
2859 proto_method_implemented(proto
->setsockopt
),
2860 proto_method_implemented(proto
->getsockopt
),
2861 proto_method_implemented(proto
->sendmsg
),
2862 proto_method_implemented(proto
->recvmsg
),
2863 proto_method_implemented(proto
->sendpage
),
2864 proto_method_implemented(proto
->bind
),
2865 proto_method_implemented(proto
->backlog_rcv
),
2866 proto_method_implemented(proto
->hash
),
2867 proto_method_implemented(proto
->unhash
),
2868 proto_method_implemented(proto
->get_port
),
2869 proto_method_implemented(proto
->enter_memory_pressure
));
2872 static int proto_seq_show(struct seq_file
*seq
, void *v
)
2874 if (v
== &proto_list
)
2875 seq_printf(seq
, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s",
2884 "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n");
2886 proto_seq_printf(seq
, list_entry(v
, struct proto
, node
));
2890 static const struct seq_operations proto_seq_ops
= {
2891 .start
= proto_seq_start
,
2892 .next
= proto_seq_next
,
2893 .stop
= proto_seq_stop
,
2894 .show
= proto_seq_show
,
2897 static int proto_seq_open(struct inode
*inode
, struct file
*file
)
2899 return seq_open_net(inode
, file
, &proto_seq_ops
,
2900 sizeof(struct seq_net_private
));
2903 static const struct file_operations proto_seq_fops
= {
2904 .owner
= THIS_MODULE
,
2905 .open
= proto_seq_open
,
2907 .llseek
= seq_lseek
,
2908 .release
= seq_release_net
,
2911 static __net_init
int proto_init_net(struct net
*net
)
2913 if (!proc_create("protocols", S_IRUGO
, net
->proc_net
, &proto_seq_fops
))
2919 static __net_exit
void proto_exit_net(struct net
*net
)
2921 remove_proc_entry("protocols", net
->proc_net
);
2925 static __net_initdata
struct pernet_operations proto_net_ops
= {
2926 .init
= proto_init_net
,
2927 .exit
= proto_exit_net
,
2930 static int __init
proto_init(void)
2932 return register_pernet_subsys(&proto_net_ops
);
2935 subsys_initcall(proto_init
);
2937 #endif /* PROC_FS */