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 <linux/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>
134 #include <linux/sock_diag.h>
136 #include <linux/filter.h>
137 #include <net/sock_reuseport.h>
139 #include <trace/events/sock.h>
145 #include <net/busy_poll.h>
147 static DEFINE_MUTEX(proto_list_mutex
);
148 static LIST_HEAD(proto_list
);
151 * sk_ns_capable - General socket capability test
152 * @sk: Socket to use a capability on or through
153 * @user_ns: The user namespace of the capability to use
154 * @cap: The capability to use
156 * Test to see if the opener of the socket had when the socket was
157 * created and the current process has the capability @cap in the user
158 * namespace @user_ns.
160 bool sk_ns_capable(const struct sock
*sk
,
161 struct user_namespace
*user_ns
, int cap
)
163 return file_ns_capable(sk
->sk_socket
->file
, user_ns
, cap
) &&
164 ns_capable(user_ns
, cap
);
166 EXPORT_SYMBOL(sk_ns_capable
);
169 * sk_capable - Socket global capability test
170 * @sk: Socket to use a capability on or through
171 * @cap: The global capability to use
173 * Test to see if the opener of the socket had when the socket was
174 * created and the current process has the capability @cap in all user
177 bool sk_capable(const struct sock
*sk
, int cap
)
179 return sk_ns_capable(sk
, &init_user_ns
, cap
);
181 EXPORT_SYMBOL(sk_capable
);
184 * sk_net_capable - Network namespace socket capability test
185 * @sk: Socket to use a capability on or through
186 * @cap: The capability to use
188 * Test to see if the opener of the socket had when the socket was created
189 * and the current process has the capability @cap over the network namespace
190 * the socket is a member of.
192 bool sk_net_capable(const struct sock
*sk
, int cap
)
194 return sk_ns_capable(sk
, sock_net(sk
)->user_ns
, cap
);
196 EXPORT_SYMBOL(sk_net_capable
);
199 * Each address family might have different locking rules, so we have
200 * one slock key per address family and separate keys for internal and
203 static struct lock_class_key af_family_keys
[AF_MAX
];
204 static struct lock_class_key af_family_kern_keys
[AF_MAX
];
205 static struct lock_class_key af_family_slock_keys
[AF_MAX
];
206 static struct lock_class_key af_family_kern_slock_keys
[AF_MAX
];
209 * Make lock validator output more readable. (we pre-construct these
210 * strings build-time, so that runtime initialization of socket
214 #define _sock_locks(x) \
215 x "AF_UNSPEC", x "AF_UNIX" , x "AF_INET" , \
216 x "AF_AX25" , x "AF_IPX" , x "AF_APPLETALK", \
217 x "AF_NETROM", x "AF_BRIDGE" , x "AF_ATMPVC" , \
218 x "AF_X25" , x "AF_INET6" , x "AF_ROSE" , \
219 x "AF_DECnet", x "AF_NETBEUI" , x "AF_SECURITY" , \
220 x "AF_KEY" , x "AF_NETLINK" , x "AF_PACKET" , \
221 x "AF_ASH" , x "AF_ECONET" , x "AF_ATMSVC" , \
222 x "AF_RDS" , x "AF_SNA" , x "AF_IRDA" , \
223 x "AF_PPPOX" , x "AF_WANPIPE" , x "AF_LLC" , \
224 x "27" , x "28" , x "AF_CAN" , \
225 x "AF_TIPC" , x "AF_BLUETOOTH", x "IUCV" , \
226 x "AF_RXRPC" , x "AF_ISDN" , x "AF_PHONET" , \
227 x "AF_IEEE802154", x "AF_CAIF" , x "AF_ALG" , \
228 x "AF_NFC" , x "AF_VSOCK" , x "AF_KCM" , \
229 x "AF_QIPCRTR", x "AF_SMC" , x "AF_MAX"
231 static const char *const af_family_key_strings
[AF_MAX
+1] = {
232 _sock_locks("sk_lock-")
234 static const char *const af_family_slock_key_strings
[AF_MAX
+1] = {
235 _sock_locks("slock-")
237 static const char *const af_family_clock_key_strings
[AF_MAX
+1] = {
238 _sock_locks("clock-")
241 static const char *const af_family_kern_key_strings
[AF_MAX
+1] = {
242 _sock_locks("k-sk_lock-")
244 static const char *const af_family_kern_slock_key_strings
[AF_MAX
+1] = {
245 _sock_locks("k-slock-")
247 static const char *const af_family_kern_clock_key_strings
[AF_MAX
+1] = {
248 _sock_locks("k-clock-")
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
];
256 static struct lock_class_key af_kern_callback_keys
[AF_MAX
];
258 /* Take into consideration the size of the struct sk_buff overhead in the
259 * determination of these values, since that is non-constant across
260 * platforms. This makes socket queueing behavior and performance
261 * not depend upon such differences.
263 #define _SK_MEM_PACKETS 256
264 #define _SK_MEM_OVERHEAD SKB_TRUESIZE(256)
265 #define SK_WMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS)
266 #define SK_RMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS)
268 /* Run time adjustable parameters. */
269 __u32 sysctl_wmem_max __read_mostly
= SK_WMEM_MAX
;
270 EXPORT_SYMBOL(sysctl_wmem_max
);
271 __u32 sysctl_rmem_max __read_mostly
= SK_RMEM_MAX
;
272 EXPORT_SYMBOL(sysctl_rmem_max
);
273 __u32 sysctl_wmem_default __read_mostly
= SK_WMEM_MAX
;
274 __u32 sysctl_rmem_default __read_mostly
= SK_RMEM_MAX
;
276 /* Maximal space eaten by iovec or ancillary data plus some space */
277 int sysctl_optmem_max __read_mostly
= sizeof(unsigned long)*(2*UIO_MAXIOV
+512);
278 EXPORT_SYMBOL(sysctl_optmem_max
);
280 int sysctl_tstamp_allow_data __read_mostly
= 1;
282 struct static_key memalloc_socks
= STATIC_KEY_INIT_FALSE
;
283 EXPORT_SYMBOL_GPL(memalloc_socks
);
286 * sk_set_memalloc - sets %SOCK_MEMALLOC
287 * @sk: socket to set it on
289 * Set %SOCK_MEMALLOC on a socket for access to emergency reserves.
290 * It's the responsibility of the admin to adjust min_free_kbytes
291 * to meet the requirements
293 void sk_set_memalloc(struct sock
*sk
)
295 sock_set_flag(sk
, SOCK_MEMALLOC
);
296 sk
->sk_allocation
|= __GFP_MEMALLOC
;
297 static_key_slow_inc(&memalloc_socks
);
299 EXPORT_SYMBOL_GPL(sk_set_memalloc
);
301 void sk_clear_memalloc(struct sock
*sk
)
303 sock_reset_flag(sk
, SOCK_MEMALLOC
);
304 sk
->sk_allocation
&= ~__GFP_MEMALLOC
;
305 static_key_slow_dec(&memalloc_socks
);
308 * SOCK_MEMALLOC is allowed to ignore rmem limits to ensure forward
309 * progress of swapping. SOCK_MEMALLOC may be cleared while
310 * it has rmem allocations due to the last swapfile being deactivated
311 * but there is a risk that the socket is unusable due to exceeding
312 * the rmem limits. Reclaim the reserves and obey rmem limits again.
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
+ DIV_ROUND_UP(tv
.tv_usec
, USEC_PER_SEC
/ 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 static bool sock_needs_netstamp(const struct sock
*sk
)
378 switch (sk
->sk_family
) {
387 static void sock_disable_timestamp(struct sock
*sk
, unsigned long flags
)
389 if (sk
->sk_flags
& flags
) {
390 sk
->sk_flags
&= ~flags
;
391 if (sock_needs_netstamp(sk
) &&
392 !(sk
->sk_flags
& SK_FLAGS_TIMESTAMP
))
393 net_disable_timestamp();
398 int __sock_queue_rcv_skb(struct sock
*sk
, struct sk_buff
*skb
)
401 struct sk_buff_head
*list
= &sk
->sk_receive_queue
;
403 if (atomic_read(&sk
->sk_rmem_alloc
) >= sk
->sk_rcvbuf
) {
404 atomic_inc(&sk
->sk_drops
);
405 trace_sock_rcvqueue_full(sk
, skb
);
409 if (!sk_rmem_schedule(sk
, skb
, skb
->truesize
)) {
410 atomic_inc(&sk
->sk_drops
);
415 skb_set_owner_r(skb
, sk
);
417 /* we escape from rcu protected region, make sure we dont leak
422 spin_lock_irqsave(&list
->lock
, flags
);
423 sock_skb_set_dropcount(sk
, skb
);
424 __skb_queue_tail(list
, skb
);
425 spin_unlock_irqrestore(&list
->lock
, flags
);
427 if (!sock_flag(sk
, SOCK_DEAD
))
428 sk
->sk_data_ready(sk
);
431 EXPORT_SYMBOL(__sock_queue_rcv_skb
);
433 int sock_queue_rcv_skb(struct sock
*sk
, struct sk_buff
*skb
)
437 err
= sk_filter(sk
, skb
);
441 return __sock_queue_rcv_skb(sk
, skb
);
443 EXPORT_SYMBOL(sock_queue_rcv_skb
);
445 int __sk_receive_skb(struct sock
*sk
, struct sk_buff
*skb
,
446 const int nested
, unsigned int trim_cap
, bool refcounted
)
448 int rc
= NET_RX_SUCCESS
;
450 if (sk_filter_trim_cap(sk
, skb
, trim_cap
))
451 goto discard_and_relse
;
455 if (sk_rcvqueues_full(sk
, sk
->sk_rcvbuf
)) {
456 atomic_inc(&sk
->sk_drops
);
457 goto discard_and_relse
;
460 bh_lock_sock_nested(sk
);
463 if (!sock_owned_by_user(sk
)) {
465 * trylock + unlock semantics:
467 mutex_acquire(&sk
->sk_lock
.dep_map
, 0, 1, _RET_IP_
);
469 rc
= sk_backlog_rcv(sk
, skb
);
471 mutex_release(&sk
->sk_lock
.dep_map
, 1, _RET_IP_
);
472 } else if (sk_add_backlog(sk
, skb
, sk
->sk_rcvbuf
)) {
474 atomic_inc(&sk
->sk_drops
);
475 goto discard_and_relse
;
487 EXPORT_SYMBOL(__sk_receive_skb
);
489 struct dst_entry
*__sk_dst_check(struct sock
*sk
, u32 cookie
)
491 struct dst_entry
*dst
= __sk_dst_get(sk
);
493 if (dst
&& dst
->obsolete
&& dst
->ops
->check(dst
, cookie
) == NULL
) {
494 sk_tx_queue_clear(sk
);
495 sk
->sk_dst_pending_confirm
= 0;
496 RCU_INIT_POINTER(sk
->sk_dst_cache
, NULL
);
503 EXPORT_SYMBOL(__sk_dst_check
);
505 struct dst_entry
*sk_dst_check(struct sock
*sk
, u32 cookie
)
507 struct dst_entry
*dst
= sk_dst_get(sk
);
509 if (dst
&& dst
->obsolete
&& dst
->ops
->check(dst
, cookie
) == NULL
) {
517 EXPORT_SYMBOL(sk_dst_check
);
519 static int sock_setbindtodevice(struct sock
*sk
, char __user
*optval
,
522 int ret
= -ENOPROTOOPT
;
523 #ifdef CONFIG_NETDEVICES
524 struct net
*net
= sock_net(sk
);
525 char devname
[IFNAMSIZ
];
530 if (!ns_capable(net
->user_ns
, CAP_NET_RAW
))
537 /* Bind this socket to a particular device like "eth0",
538 * as specified in the passed interface name. If the
539 * name is "" or the option length is zero the socket
542 if (optlen
> IFNAMSIZ
- 1)
543 optlen
= IFNAMSIZ
- 1;
544 memset(devname
, 0, sizeof(devname
));
547 if (copy_from_user(devname
, optval
, optlen
))
551 if (devname
[0] != '\0') {
552 struct net_device
*dev
;
555 dev
= dev_get_by_name_rcu(net
, devname
);
557 index
= dev
->ifindex
;
565 sk
->sk_bound_dev_if
= index
;
577 static int sock_getbindtodevice(struct sock
*sk
, char __user
*optval
,
578 int __user
*optlen
, int len
)
580 int ret
= -ENOPROTOOPT
;
581 #ifdef CONFIG_NETDEVICES
582 struct net
*net
= sock_net(sk
);
583 char devname
[IFNAMSIZ
];
585 if (sk
->sk_bound_dev_if
== 0) {
594 ret
= netdev_get_name(net
, devname
, sk
->sk_bound_dev_if
);
598 len
= strlen(devname
) + 1;
601 if (copy_to_user(optval
, devname
, len
))
606 if (put_user(len
, optlen
))
617 static inline void sock_valbool_flag(struct sock
*sk
, int bit
, int valbool
)
620 sock_set_flag(sk
, bit
);
622 sock_reset_flag(sk
, bit
);
625 bool sk_mc_loop(struct sock
*sk
)
627 if (dev_recursion_level())
631 switch (sk
->sk_family
) {
633 return inet_sk(sk
)->mc_loop
;
634 #if IS_ENABLED(CONFIG_IPV6)
636 return inet6_sk(sk
)->mc_loop
;
642 EXPORT_SYMBOL(sk_mc_loop
);
645 * This is meant for all protocols to use and covers goings on
646 * at the socket level. Everything here is generic.
649 int sock_setsockopt(struct socket
*sock
, int level
, int optname
,
650 char __user
*optval
, unsigned int optlen
)
652 struct sock
*sk
= sock
->sk
;
659 * Options without arguments
662 if (optname
== SO_BINDTODEVICE
)
663 return sock_setbindtodevice(sk
, optval
, optlen
);
665 if (optlen
< sizeof(int))
668 if (get_user(val
, (int __user
*)optval
))
671 valbool
= val
? 1 : 0;
677 if (val
&& !capable(CAP_NET_ADMIN
))
680 sock_valbool_flag(sk
, SOCK_DBG
, valbool
);
683 sk
->sk_reuse
= (valbool
? SK_CAN_REUSE
: SK_NO_REUSE
);
686 sk
->sk_reuseport
= valbool
;
695 sock_valbool_flag(sk
, SOCK_LOCALROUTE
, valbool
);
698 sock_valbool_flag(sk
, SOCK_BROADCAST
, valbool
);
701 /* Don't error on this BSD doesn't and if you think
702 * about it this is right. Otherwise apps have to
703 * play 'guess the biggest size' games. RCVBUF/SNDBUF
704 * are treated in BSD as hints
706 val
= min_t(u32
, val
, sysctl_wmem_max
);
708 sk
->sk_userlocks
|= SOCK_SNDBUF_LOCK
;
709 sk
->sk_sndbuf
= max_t(int, val
* 2, SOCK_MIN_SNDBUF
);
710 /* Wake up sending tasks if we upped the value. */
711 sk
->sk_write_space(sk
);
715 if (!capable(CAP_NET_ADMIN
)) {
722 /* Don't error on this BSD doesn't and if you think
723 * about it this is right. Otherwise apps have to
724 * play 'guess the biggest size' games. RCVBUF/SNDBUF
725 * are treated in BSD as hints
727 val
= min_t(u32
, val
, sysctl_rmem_max
);
729 sk
->sk_userlocks
|= SOCK_RCVBUF_LOCK
;
731 * We double it on the way in to account for
732 * "struct sk_buff" etc. overhead. Applications
733 * assume that the SO_RCVBUF setting they make will
734 * allow that much actual data to be received on that
737 * Applications are unaware that "struct sk_buff" and
738 * other overheads allocate from the receive buffer
739 * during socket buffer allocation.
741 * And after considering the possible alternatives,
742 * returning the value we actually used in getsockopt
743 * is the most desirable behavior.
745 sk
->sk_rcvbuf
= max_t(int, val
* 2, SOCK_MIN_RCVBUF
);
749 if (!capable(CAP_NET_ADMIN
)) {
756 if (sk
->sk_prot
->keepalive
)
757 sk
->sk_prot
->keepalive(sk
, valbool
);
758 sock_valbool_flag(sk
, SOCK_KEEPOPEN
, valbool
);
762 sock_valbool_flag(sk
, SOCK_URGINLINE
, valbool
);
766 sk
->sk_no_check_tx
= valbool
;
770 if ((val
>= 0 && val
<= 6) ||
771 ns_capable(sock_net(sk
)->user_ns
, CAP_NET_ADMIN
))
772 sk
->sk_priority
= val
;
778 if (optlen
< sizeof(ling
)) {
779 ret
= -EINVAL
; /* 1003.1g */
782 if (copy_from_user(&ling
, optval
, sizeof(ling
))) {
787 sock_reset_flag(sk
, SOCK_LINGER
);
789 #if (BITS_PER_LONG == 32)
790 if ((unsigned int)ling
.l_linger
>= MAX_SCHEDULE_TIMEOUT
/HZ
)
791 sk
->sk_lingertime
= MAX_SCHEDULE_TIMEOUT
;
794 sk
->sk_lingertime
= (unsigned int)ling
.l_linger
* HZ
;
795 sock_set_flag(sk
, SOCK_LINGER
);
800 sock_warn_obsolete_bsdism("setsockopt");
805 set_bit(SOCK_PASSCRED
, &sock
->flags
);
807 clear_bit(SOCK_PASSCRED
, &sock
->flags
);
813 if (optname
== SO_TIMESTAMP
)
814 sock_reset_flag(sk
, SOCK_RCVTSTAMPNS
);
816 sock_set_flag(sk
, SOCK_RCVTSTAMPNS
);
817 sock_set_flag(sk
, SOCK_RCVTSTAMP
);
818 sock_enable_timestamp(sk
, SOCK_TIMESTAMP
);
820 sock_reset_flag(sk
, SOCK_RCVTSTAMP
);
821 sock_reset_flag(sk
, SOCK_RCVTSTAMPNS
);
825 case SO_TIMESTAMPING
:
826 if (val
& ~SOF_TIMESTAMPING_MASK
) {
831 if (val
& SOF_TIMESTAMPING_OPT_ID
&&
832 !(sk
->sk_tsflags
& SOF_TIMESTAMPING_OPT_ID
)) {
833 if (sk
->sk_protocol
== IPPROTO_TCP
&&
834 sk
->sk_type
== SOCK_STREAM
) {
835 if ((1 << sk
->sk_state
) &
836 (TCPF_CLOSE
| TCPF_LISTEN
)) {
840 sk
->sk_tskey
= tcp_sk(sk
)->snd_una
;
846 if (val
& SOF_TIMESTAMPING_OPT_STATS
&&
847 !(val
& SOF_TIMESTAMPING_OPT_TSONLY
)) {
852 sk
->sk_tsflags
= val
;
853 if (val
& SOF_TIMESTAMPING_RX_SOFTWARE
)
854 sock_enable_timestamp(sk
,
855 SOCK_TIMESTAMPING_RX_SOFTWARE
);
857 sock_disable_timestamp(sk
,
858 (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE
));
864 sk
->sk_rcvlowat
= val
? : 1;
868 ret
= sock_set_timeout(&sk
->sk_rcvtimeo
, optval
, optlen
);
872 ret
= sock_set_timeout(&sk
->sk_sndtimeo
, optval
, optlen
);
875 case SO_ATTACH_FILTER
:
877 if (optlen
== sizeof(struct sock_fprog
)) {
878 struct sock_fprog fprog
;
881 if (copy_from_user(&fprog
, optval
, sizeof(fprog
)))
884 ret
= sk_attach_filter(&fprog
, sk
);
890 if (optlen
== sizeof(u32
)) {
894 if (copy_from_user(&ufd
, optval
, sizeof(ufd
)))
897 ret
= sk_attach_bpf(ufd
, sk
);
901 case SO_ATTACH_REUSEPORT_CBPF
:
903 if (optlen
== sizeof(struct sock_fprog
)) {
904 struct sock_fprog fprog
;
907 if (copy_from_user(&fprog
, optval
, sizeof(fprog
)))
910 ret
= sk_reuseport_attach_filter(&fprog
, sk
);
914 case SO_ATTACH_REUSEPORT_EBPF
:
916 if (optlen
== sizeof(u32
)) {
920 if (copy_from_user(&ufd
, optval
, sizeof(ufd
)))
923 ret
= sk_reuseport_attach_bpf(ufd
, sk
);
927 case SO_DETACH_FILTER
:
928 ret
= sk_detach_filter(sk
);
932 if (sock_flag(sk
, SOCK_FILTER_LOCKED
) && !valbool
)
935 sock_valbool_flag(sk
, SOCK_FILTER_LOCKED
, valbool
);
940 set_bit(SOCK_PASSSEC
, &sock
->flags
);
942 clear_bit(SOCK_PASSSEC
, &sock
->flags
);
945 if (!ns_capable(sock_net(sk
)->user_ns
, CAP_NET_ADMIN
))
952 sock_valbool_flag(sk
, SOCK_RXQ_OVFL
, valbool
);
956 sock_valbool_flag(sk
, SOCK_WIFI_STATUS
, valbool
);
960 if (sock
->ops
->set_peek_off
)
961 ret
= sock
->ops
->set_peek_off(sk
, val
);
967 sock_valbool_flag(sk
, SOCK_NOFCS
, valbool
);
970 case SO_SELECT_ERR_QUEUE
:
971 sock_valbool_flag(sk
, SOCK_SELECT_ERR_QUEUE
, valbool
);
974 #ifdef CONFIG_NET_RX_BUSY_POLL
976 /* allow unprivileged users to decrease the value */
977 if ((val
> sk
->sk_ll_usec
) && !capable(CAP_NET_ADMIN
))
983 sk
->sk_ll_usec
= val
;
988 case SO_MAX_PACING_RATE
:
989 sk
->sk_max_pacing_rate
= val
;
990 sk
->sk_pacing_rate
= min(sk
->sk_pacing_rate
,
991 sk
->sk_max_pacing_rate
);
994 case SO_INCOMING_CPU
:
995 sk
->sk_incoming_cpu
= val
;
1000 dst_negative_advice(sk
);
1009 EXPORT_SYMBOL(sock_setsockopt
);
1012 static void cred_to_ucred(struct pid
*pid
, const struct cred
*cred
,
1013 struct ucred
*ucred
)
1015 ucred
->pid
= pid_vnr(pid
);
1016 ucred
->uid
= ucred
->gid
= -1;
1018 struct user_namespace
*current_ns
= current_user_ns();
1020 ucred
->uid
= from_kuid_munged(current_ns
, cred
->euid
);
1021 ucred
->gid
= from_kgid_munged(current_ns
, cred
->egid
);
1025 int sock_getsockopt(struct socket
*sock
, int level
, int optname
,
1026 char __user
*optval
, int __user
*optlen
)
1028 struct sock
*sk
= sock
->sk
;
1036 int lv
= sizeof(int);
1039 if (get_user(len
, optlen
))
1044 memset(&v
, 0, sizeof(v
));
1048 v
.val
= sock_flag(sk
, SOCK_DBG
);
1052 v
.val
= sock_flag(sk
, SOCK_LOCALROUTE
);
1056 v
.val
= sock_flag(sk
, SOCK_BROADCAST
);
1060 v
.val
= sk
->sk_sndbuf
;
1064 v
.val
= sk
->sk_rcvbuf
;
1068 v
.val
= sk
->sk_reuse
;
1072 v
.val
= sk
->sk_reuseport
;
1076 v
.val
= sock_flag(sk
, SOCK_KEEPOPEN
);
1080 v
.val
= sk
->sk_type
;
1084 v
.val
= sk
->sk_protocol
;
1088 v
.val
= sk
->sk_family
;
1092 v
.val
= -sock_error(sk
);
1094 v
.val
= xchg(&sk
->sk_err_soft
, 0);
1098 v
.val
= sock_flag(sk
, SOCK_URGINLINE
);
1102 v
.val
= sk
->sk_no_check_tx
;
1106 v
.val
= sk
->sk_priority
;
1110 lv
= sizeof(v
.ling
);
1111 v
.ling
.l_onoff
= sock_flag(sk
, SOCK_LINGER
);
1112 v
.ling
.l_linger
= sk
->sk_lingertime
/ HZ
;
1116 sock_warn_obsolete_bsdism("getsockopt");
1120 v
.val
= sock_flag(sk
, SOCK_RCVTSTAMP
) &&
1121 !sock_flag(sk
, SOCK_RCVTSTAMPNS
);
1124 case SO_TIMESTAMPNS
:
1125 v
.val
= sock_flag(sk
, SOCK_RCVTSTAMPNS
);
1128 case SO_TIMESTAMPING
:
1129 v
.val
= sk
->sk_tsflags
;
1133 lv
= sizeof(struct timeval
);
1134 if (sk
->sk_rcvtimeo
== MAX_SCHEDULE_TIMEOUT
) {
1138 v
.tm
.tv_sec
= sk
->sk_rcvtimeo
/ HZ
;
1139 v
.tm
.tv_usec
= ((sk
->sk_rcvtimeo
% HZ
) * USEC_PER_SEC
) / HZ
;
1144 lv
= sizeof(struct timeval
);
1145 if (sk
->sk_sndtimeo
== MAX_SCHEDULE_TIMEOUT
) {
1149 v
.tm
.tv_sec
= sk
->sk_sndtimeo
/ HZ
;
1150 v
.tm
.tv_usec
= ((sk
->sk_sndtimeo
% HZ
) * USEC_PER_SEC
) / HZ
;
1155 v
.val
= sk
->sk_rcvlowat
;
1163 v
.val
= !!test_bit(SOCK_PASSCRED
, &sock
->flags
);
1168 struct ucred peercred
;
1169 if (len
> sizeof(peercred
))
1170 len
= sizeof(peercred
);
1171 cred_to_ucred(sk
->sk_peer_pid
, sk
->sk_peer_cred
, &peercred
);
1172 if (copy_to_user(optval
, &peercred
, len
))
1181 if (sock
->ops
->getname(sock
, (struct sockaddr
*)address
, &lv
, 2))
1185 if (copy_to_user(optval
, address
, len
))
1190 /* Dubious BSD thing... Probably nobody even uses it, but
1191 * the UNIX standard wants it for whatever reason... -DaveM
1194 v
.val
= sk
->sk_state
== TCP_LISTEN
;
1198 v
.val
= !!test_bit(SOCK_PASSSEC
, &sock
->flags
);
1202 return security_socket_getpeersec_stream(sock
, optval
, optlen
, len
);
1205 v
.val
= sk
->sk_mark
;
1209 v
.val
= sock_flag(sk
, SOCK_RXQ_OVFL
);
1212 case SO_WIFI_STATUS
:
1213 v
.val
= sock_flag(sk
, SOCK_WIFI_STATUS
);
1217 if (!sock
->ops
->set_peek_off
)
1220 v
.val
= sk
->sk_peek_off
;
1223 v
.val
= sock_flag(sk
, SOCK_NOFCS
);
1226 case SO_BINDTODEVICE
:
1227 return sock_getbindtodevice(sk
, optval
, optlen
, len
);
1230 len
= sk_get_filter(sk
, (struct sock_filter __user
*)optval
, len
);
1236 case SO_LOCK_FILTER
:
1237 v
.val
= sock_flag(sk
, SOCK_FILTER_LOCKED
);
1240 case SO_BPF_EXTENSIONS
:
1241 v
.val
= bpf_tell_extensions();
1244 case SO_SELECT_ERR_QUEUE
:
1245 v
.val
= sock_flag(sk
, SOCK_SELECT_ERR_QUEUE
);
1248 #ifdef CONFIG_NET_RX_BUSY_POLL
1250 v
.val
= sk
->sk_ll_usec
;
1254 case SO_MAX_PACING_RATE
:
1255 v
.val
= sk
->sk_max_pacing_rate
;
1258 case SO_INCOMING_CPU
:
1259 v
.val
= sk
->sk_incoming_cpu
;
1263 /* We implement the SO_SNDLOWAT etc to not be settable
1266 return -ENOPROTOOPT
;
1271 if (copy_to_user(optval
, &v
, len
))
1274 if (put_user(len
, optlen
))
1280 * Initialize an sk_lock.
1282 * (We also register the sk_lock with the lock validator.)
1284 static inline void sock_lock_init(struct sock
*sk
)
1286 if (sk
->sk_kern_sock
)
1287 sock_lock_init_class_and_name(
1289 af_family_kern_slock_key_strings
[sk
->sk_family
],
1290 af_family_kern_slock_keys
+ sk
->sk_family
,
1291 af_family_kern_key_strings
[sk
->sk_family
],
1292 af_family_kern_keys
+ sk
->sk_family
);
1294 sock_lock_init_class_and_name(
1296 af_family_slock_key_strings
[sk
->sk_family
],
1297 af_family_slock_keys
+ sk
->sk_family
,
1298 af_family_key_strings
[sk
->sk_family
],
1299 af_family_keys
+ sk
->sk_family
);
1303 * Copy all fields from osk to nsk but nsk->sk_refcnt must not change yet,
1304 * even temporarly, because of RCU lookups. sk_node should also be left as is.
1305 * We must not copy fields between sk_dontcopy_begin and sk_dontcopy_end
1307 static void sock_copy(struct sock
*nsk
, const struct sock
*osk
)
1309 #ifdef CONFIG_SECURITY_NETWORK
1310 void *sptr
= nsk
->sk_security
;
1312 memcpy(nsk
, osk
, offsetof(struct sock
, sk_dontcopy_begin
));
1314 memcpy(&nsk
->sk_dontcopy_end
, &osk
->sk_dontcopy_end
,
1315 osk
->sk_prot
->obj_size
- offsetof(struct sock
, sk_dontcopy_end
));
1317 #ifdef CONFIG_SECURITY_NETWORK
1318 nsk
->sk_security
= sptr
;
1319 security_sk_clone(osk
, nsk
);
1323 static struct sock
*sk_prot_alloc(struct proto
*prot
, gfp_t priority
,
1327 struct kmem_cache
*slab
;
1331 sk
= kmem_cache_alloc(slab
, priority
& ~__GFP_ZERO
);
1334 if (priority
& __GFP_ZERO
)
1335 sk_prot_clear_nulls(sk
, prot
->obj_size
);
1337 sk
= kmalloc(prot
->obj_size
, priority
);
1340 kmemcheck_annotate_bitfield(sk
, flags
);
1342 if (security_sk_alloc(sk
, family
, priority
))
1345 if (!try_module_get(prot
->owner
))
1347 sk_tx_queue_clear(sk
);
1353 security_sk_free(sk
);
1356 kmem_cache_free(slab
, sk
);
1362 static void sk_prot_free(struct proto
*prot
, struct sock
*sk
)
1364 struct kmem_cache
*slab
;
1365 struct module
*owner
;
1367 owner
= prot
->owner
;
1370 cgroup_sk_free(&sk
->sk_cgrp_data
);
1371 mem_cgroup_sk_free(sk
);
1372 security_sk_free(sk
);
1374 kmem_cache_free(slab
, sk
);
1381 * sk_alloc - All socket objects are allocated here
1382 * @net: the applicable net namespace
1383 * @family: protocol family
1384 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
1385 * @prot: struct proto associated with this new sock instance
1386 * @kern: is this to be a kernel socket?
1388 struct sock
*sk_alloc(struct net
*net
, int family
, gfp_t priority
,
1389 struct proto
*prot
, int kern
)
1393 sk
= sk_prot_alloc(prot
, priority
| __GFP_ZERO
, family
);
1395 sk
->sk_family
= family
;
1397 * See comment in struct sock definition to understand
1398 * why we need sk_prot_creator -acme
1400 sk
->sk_prot
= sk
->sk_prot_creator
= prot
;
1401 sk
->sk_kern_sock
= kern
;
1403 sk
->sk_net_refcnt
= kern
? 0 : 1;
1404 if (likely(sk
->sk_net_refcnt
))
1406 sock_net_set(sk
, net
);
1407 atomic_set(&sk
->sk_wmem_alloc
, 1);
1409 mem_cgroup_sk_alloc(sk
);
1410 cgroup_sk_alloc(&sk
->sk_cgrp_data
);
1411 sock_update_classid(&sk
->sk_cgrp_data
);
1412 sock_update_netprioidx(&sk
->sk_cgrp_data
);
1417 EXPORT_SYMBOL(sk_alloc
);
1419 /* Sockets having SOCK_RCU_FREE will call this function after one RCU
1420 * grace period. This is the case for UDP sockets and TCP listeners.
1422 static void __sk_destruct(struct rcu_head
*head
)
1424 struct sock
*sk
= container_of(head
, struct sock
, sk_rcu
);
1425 struct sk_filter
*filter
;
1427 if (sk
->sk_destruct
)
1428 sk
->sk_destruct(sk
);
1430 filter
= rcu_dereference_check(sk
->sk_filter
,
1431 atomic_read(&sk
->sk_wmem_alloc
) == 0);
1433 sk_filter_uncharge(sk
, filter
);
1434 RCU_INIT_POINTER(sk
->sk_filter
, NULL
);
1436 if (rcu_access_pointer(sk
->sk_reuseport_cb
))
1437 reuseport_detach_sock(sk
);
1439 sock_disable_timestamp(sk
, SK_FLAGS_TIMESTAMP
);
1441 if (atomic_read(&sk
->sk_omem_alloc
))
1442 pr_debug("%s: optmem leakage (%d bytes) detected\n",
1443 __func__
, atomic_read(&sk
->sk_omem_alloc
));
1445 if (sk
->sk_frag
.page
) {
1446 put_page(sk
->sk_frag
.page
);
1447 sk
->sk_frag
.page
= NULL
;
1450 if (sk
->sk_peer_cred
)
1451 put_cred(sk
->sk_peer_cred
);
1452 put_pid(sk
->sk_peer_pid
);
1453 if (likely(sk
->sk_net_refcnt
))
1454 put_net(sock_net(sk
));
1455 sk_prot_free(sk
->sk_prot_creator
, sk
);
1458 void sk_destruct(struct sock
*sk
)
1460 if (sock_flag(sk
, SOCK_RCU_FREE
))
1461 call_rcu(&sk
->sk_rcu
, __sk_destruct
);
1463 __sk_destruct(&sk
->sk_rcu
);
1466 static void __sk_free(struct sock
*sk
)
1468 if (unlikely(sock_diag_has_destroy_listeners(sk
) && sk
->sk_net_refcnt
))
1469 sock_diag_broadcast_destroy(sk
);
1474 void sk_free(struct sock
*sk
)
1477 * We subtract one from sk_wmem_alloc and can know if
1478 * some packets are still in some tx queue.
1479 * If not null, sock_wfree() will call __sk_free(sk) later
1481 if (atomic_dec_and_test(&sk
->sk_wmem_alloc
))
1484 EXPORT_SYMBOL(sk_free
);
1487 * sk_clone_lock - clone a socket, and lock its clone
1488 * @sk: the socket to clone
1489 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
1491 * Caller must unlock socket even in error path (bh_unlock_sock(newsk))
1493 struct sock
*sk_clone_lock(const struct sock
*sk
, const gfp_t priority
)
1496 bool is_charged
= true;
1498 newsk
= sk_prot_alloc(sk
->sk_prot
, priority
, sk
->sk_family
);
1499 if (newsk
!= NULL
) {
1500 struct sk_filter
*filter
;
1502 sock_copy(newsk
, sk
);
1505 if (likely(newsk
->sk_net_refcnt
))
1506 get_net(sock_net(newsk
));
1507 sk_node_init(&newsk
->sk_node
);
1508 sock_lock_init(newsk
);
1509 bh_lock_sock(newsk
);
1510 newsk
->sk_backlog
.head
= newsk
->sk_backlog
.tail
= NULL
;
1511 newsk
->sk_backlog
.len
= 0;
1513 atomic_set(&newsk
->sk_rmem_alloc
, 0);
1515 * sk_wmem_alloc set to one (see sk_free() and sock_wfree())
1517 atomic_set(&newsk
->sk_wmem_alloc
, 1);
1518 atomic_set(&newsk
->sk_omem_alloc
, 0);
1519 skb_queue_head_init(&newsk
->sk_receive_queue
);
1520 skb_queue_head_init(&newsk
->sk_write_queue
);
1522 rwlock_init(&newsk
->sk_callback_lock
);
1523 lockdep_set_class_and_name(&newsk
->sk_callback_lock
,
1524 af_callback_keys
+ newsk
->sk_family
,
1525 af_family_clock_key_strings
[newsk
->sk_family
]);
1527 newsk
->sk_dst_cache
= NULL
;
1528 newsk
->sk_dst_pending_confirm
= 0;
1529 newsk
->sk_wmem_queued
= 0;
1530 newsk
->sk_forward_alloc
= 0;
1531 atomic_set(&newsk
->sk_drops
, 0);
1532 newsk
->sk_send_head
= NULL
;
1533 newsk
->sk_userlocks
= sk
->sk_userlocks
& ~SOCK_BINDPORT_LOCK
;
1535 sock_reset_flag(newsk
, SOCK_DONE
);
1536 skb_queue_head_init(&newsk
->sk_error_queue
);
1538 filter
= rcu_dereference_protected(newsk
->sk_filter
, 1);
1540 /* though it's an empty new sock, the charging may fail
1541 * if sysctl_optmem_max was changed between creation of
1542 * original socket and cloning
1544 is_charged
= sk_filter_charge(newsk
, filter
);
1546 if (unlikely(!is_charged
|| xfrm_sk_clone_policy(newsk
, sk
))) {
1547 /* We need to make sure that we don't uncharge the new
1548 * socket if we couldn't charge it in the first place
1549 * as otherwise we uncharge the parent's filter.
1552 RCU_INIT_POINTER(newsk
->sk_filter
, NULL
);
1553 sk_free_unlock_clone(newsk
);
1557 RCU_INIT_POINTER(newsk
->sk_reuseport_cb
, NULL
);
1560 newsk
->sk_err_soft
= 0;
1561 newsk
->sk_priority
= 0;
1562 newsk
->sk_incoming_cpu
= raw_smp_processor_id();
1563 atomic64_set(&newsk
->sk_cookie
, 0);
1565 mem_cgroup_sk_alloc(newsk
);
1566 cgroup_sk_alloc(&newsk
->sk_cgrp_data
);
1569 * Before updating sk_refcnt, we must commit prior changes to memory
1570 * (Documentation/RCU/rculist_nulls.txt for details)
1573 atomic_set(&newsk
->sk_refcnt
, 2);
1576 * Increment the counter in the same struct proto as the master
1577 * sock (sk_refcnt_debug_inc uses newsk->sk_prot->socks, that
1578 * is the same as sk->sk_prot->socks, as this field was copied
1581 * This _changes_ the previous behaviour, where
1582 * tcp_create_openreq_child always was incrementing the
1583 * equivalent to tcp_prot->socks (inet_sock_nr), so this have
1584 * to be taken into account in all callers. -acme
1586 sk_refcnt_debug_inc(newsk
);
1587 sk_set_socket(newsk
, NULL
);
1588 newsk
->sk_wq
= NULL
;
1590 if (newsk
->sk_prot
->sockets_allocated
)
1591 sk_sockets_allocated_inc(newsk
);
1593 if (sock_needs_netstamp(sk
) &&
1594 newsk
->sk_flags
& SK_FLAGS_TIMESTAMP
)
1595 net_enable_timestamp();
1600 EXPORT_SYMBOL_GPL(sk_clone_lock
);
1602 void sk_free_unlock_clone(struct sock
*sk
)
1604 /* It is still raw copy of parent, so invalidate
1605 * destructor and make plain sk_free() */
1606 sk
->sk_destruct
= NULL
;
1610 EXPORT_SYMBOL_GPL(sk_free_unlock_clone
);
1612 void sk_setup_caps(struct sock
*sk
, struct dst_entry
*dst
)
1616 sk_dst_set(sk
, dst
);
1617 sk
->sk_route_caps
= dst
->dev
->features
;
1618 if (sk
->sk_route_caps
& NETIF_F_GSO
)
1619 sk
->sk_route_caps
|= NETIF_F_GSO_SOFTWARE
;
1620 sk
->sk_route_caps
&= ~sk
->sk_route_nocaps
;
1621 if (sk_can_gso(sk
)) {
1622 if (dst
->header_len
) {
1623 sk
->sk_route_caps
&= ~NETIF_F_GSO_MASK
;
1625 sk
->sk_route_caps
|= NETIF_F_SG
| NETIF_F_HW_CSUM
;
1626 sk
->sk_gso_max_size
= dst
->dev
->gso_max_size
;
1627 max_segs
= max_t(u32
, dst
->dev
->gso_max_segs
, 1);
1630 sk
->sk_gso_max_segs
= max_segs
;
1632 EXPORT_SYMBOL_GPL(sk_setup_caps
);
1635 * Simple resource managers for sockets.
1640 * Write buffer destructor automatically called from kfree_skb.
1642 void sock_wfree(struct sk_buff
*skb
)
1644 struct sock
*sk
= skb
->sk
;
1645 unsigned int len
= skb
->truesize
;
1647 if (!sock_flag(sk
, SOCK_USE_WRITE_QUEUE
)) {
1649 * Keep a reference on sk_wmem_alloc, this will be released
1650 * after sk_write_space() call
1652 atomic_sub(len
- 1, &sk
->sk_wmem_alloc
);
1653 sk
->sk_write_space(sk
);
1657 * if sk_wmem_alloc reaches 0, we must finish what sk_free()
1658 * could not do because of in-flight packets
1660 if (atomic_sub_and_test(len
, &sk
->sk_wmem_alloc
))
1663 EXPORT_SYMBOL(sock_wfree
);
1665 /* This variant of sock_wfree() is used by TCP,
1666 * since it sets SOCK_USE_WRITE_QUEUE.
1668 void __sock_wfree(struct sk_buff
*skb
)
1670 struct sock
*sk
= skb
->sk
;
1672 if (atomic_sub_and_test(skb
->truesize
, &sk
->sk_wmem_alloc
))
1676 void skb_set_owner_w(struct sk_buff
*skb
, struct sock
*sk
)
1681 if (unlikely(!sk_fullsock(sk
))) {
1682 skb
->destructor
= sock_edemux
;
1687 skb
->destructor
= sock_wfree
;
1688 skb_set_hash_from_sk(skb
, sk
);
1690 * We used to take a refcount on sk, but following operation
1691 * is enough to guarantee sk_free() wont free this sock until
1692 * all in-flight packets are completed
1694 atomic_add(skb
->truesize
, &sk
->sk_wmem_alloc
);
1696 EXPORT_SYMBOL(skb_set_owner_w
);
1698 /* This helper is used by netem, as it can hold packets in its
1699 * delay queue. We want to allow the owner socket to send more
1700 * packets, as if they were already TX completed by a typical driver.
1701 * But we also want to keep skb->sk set because some packet schedulers
1702 * rely on it (sch_fq for example). So we set skb->truesize to a small
1703 * amount (1) and decrease sk_wmem_alloc accordingly.
1705 void skb_orphan_partial(struct sk_buff
*skb
)
1707 /* If this skb is a TCP pure ACK or already went here,
1708 * we have nothing to do. 2 is already a very small truesize.
1710 if (skb
->truesize
<= 2)
1713 /* TCP stack sets skb->ooo_okay based on sk_wmem_alloc,
1714 * so we do not completely orphan skb, but transfert all
1715 * accounted bytes but one, to avoid unexpected reorders.
1717 if (skb
->destructor
== sock_wfree
1719 || skb
->destructor
== tcp_wfree
1722 atomic_sub(skb
->truesize
- 1, &skb
->sk
->sk_wmem_alloc
);
1728 EXPORT_SYMBOL(skb_orphan_partial
);
1731 * Read buffer destructor automatically called from kfree_skb.
1733 void sock_rfree(struct sk_buff
*skb
)
1735 struct sock
*sk
= skb
->sk
;
1736 unsigned int len
= skb
->truesize
;
1738 atomic_sub(len
, &sk
->sk_rmem_alloc
);
1739 sk_mem_uncharge(sk
, len
);
1741 EXPORT_SYMBOL(sock_rfree
);
1744 * Buffer destructor for skbs that are not used directly in read or write
1745 * path, e.g. for error handler skbs. Automatically called from kfree_skb.
1747 void sock_efree(struct sk_buff
*skb
)
1751 EXPORT_SYMBOL(sock_efree
);
1753 kuid_t
sock_i_uid(struct sock
*sk
)
1757 read_lock_bh(&sk
->sk_callback_lock
);
1758 uid
= sk
->sk_socket
? SOCK_INODE(sk
->sk_socket
)->i_uid
: GLOBAL_ROOT_UID
;
1759 read_unlock_bh(&sk
->sk_callback_lock
);
1762 EXPORT_SYMBOL(sock_i_uid
);
1764 unsigned long sock_i_ino(struct sock
*sk
)
1768 read_lock_bh(&sk
->sk_callback_lock
);
1769 ino
= sk
->sk_socket
? SOCK_INODE(sk
->sk_socket
)->i_ino
: 0;
1770 read_unlock_bh(&sk
->sk_callback_lock
);
1773 EXPORT_SYMBOL(sock_i_ino
);
1776 * Allocate a skb from the socket's send buffer.
1778 struct sk_buff
*sock_wmalloc(struct sock
*sk
, unsigned long size
, int force
,
1781 if (force
|| atomic_read(&sk
->sk_wmem_alloc
) < sk
->sk_sndbuf
) {
1782 struct sk_buff
*skb
= alloc_skb(size
, priority
);
1784 skb_set_owner_w(skb
, sk
);
1790 EXPORT_SYMBOL(sock_wmalloc
);
1793 * Allocate a memory block from the socket's option memory buffer.
1795 void *sock_kmalloc(struct sock
*sk
, int size
, gfp_t priority
)
1797 if ((unsigned int)size
<= sysctl_optmem_max
&&
1798 atomic_read(&sk
->sk_omem_alloc
) + size
< sysctl_optmem_max
) {
1800 /* First do the add, to avoid the race if kmalloc
1803 atomic_add(size
, &sk
->sk_omem_alloc
);
1804 mem
= kmalloc(size
, priority
);
1807 atomic_sub(size
, &sk
->sk_omem_alloc
);
1811 EXPORT_SYMBOL(sock_kmalloc
);
1813 /* Free an option memory block. Note, we actually want the inline
1814 * here as this allows gcc to detect the nullify and fold away the
1815 * condition entirely.
1817 static inline void __sock_kfree_s(struct sock
*sk
, void *mem
, int size
,
1820 if (WARN_ON_ONCE(!mem
))
1826 atomic_sub(size
, &sk
->sk_omem_alloc
);
1829 void sock_kfree_s(struct sock
*sk
, void *mem
, int size
)
1831 __sock_kfree_s(sk
, mem
, size
, false);
1833 EXPORT_SYMBOL(sock_kfree_s
);
1835 void sock_kzfree_s(struct sock
*sk
, void *mem
, int size
)
1837 __sock_kfree_s(sk
, mem
, size
, true);
1839 EXPORT_SYMBOL(sock_kzfree_s
);
1841 /* It is almost wait_for_tcp_memory minus release_sock/lock_sock.
1842 I think, these locks should be removed for datagram sockets.
1844 static long sock_wait_for_wmem(struct sock
*sk
, long timeo
)
1848 sk_clear_bit(SOCKWQ_ASYNC_NOSPACE
, sk
);
1852 if (signal_pending(current
))
1854 set_bit(SOCK_NOSPACE
, &sk
->sk_socket
->flags
);
1855 prepare_to_wait(sk_sleep(sk
), &wait
, TASK_INTERRUPTIBLE
);
1856 if (atomic_read(&sk
->sk_wmem_alloc
) < sk
->sk_sndbuf
)
1858 if (sk
->sk_shutdown
& SEND_SHUTDOWN
)
1862 timeo
= schedule_timeout(timeo
);
1864 finish_wait(sk_sleep(sk
), &wait
);
1870 * Generic send/receive buffer handlers
1873 struct sk_buff
*sock_alloc_send_pskb(struct sock
*sk
, unsigned long header_len
,
1874 unsigned long data_len
, int noblock
,
1875 int *errcode
, int max_page_order
)
1877 struct sk_buff
*skb
;
1881 timeo
= sock_sndtimeo(sk
, noblock
);
1883 err
= sock_error(sk
);
1888 if (sk
->sk_shutdown
& SEND_SHUTDOWN
)
1891 if (sk_wmem_alloc_get(sk
) < sk
->sk_sndbuf
)
1894 sk_set_bit(SOCKWQ_ASYNC_NOSPACE
, sk
);
1895 set_bit(SOCK_NOSPACE
, &sk
->sk_socket
->flags
);
1899 if (signal_pending(current
))
1901 timeo
= sock_wait_for_wmem(sk
, timeo
);
1903 skb
= alloc_skb_with_frags(header_len
, data_len
, max_page_order
,
1904 errcode
, sk
->sk_allocation
);
1906 skb_set_owner_w(skb
, sk
);
1910 err
= sock_intr_errno(timeo
);
1915 EXPORT_SYMBOL(sock_alloc_send_pskb
);
1917 struct sk_buff
*sock_alloc_send_skb(struct sock
*sk
, unsigned long size
,
1918 int noblock
, int *errcode
)
1920 return sock_alloc_send_pskb(sk
, size
, 0, noblock
, errcode
, 0);
1922 EXPORT_SYMBOL(sock_alloc_send_skb
);
1924 int __sock_cmsg_send(struct sock
*sk
, struct msghdr
*msg
, struct cmsghdr
*cmsg
,
1925 struct sockcm_cookie
*sockc
)
1929 switch (cmsg
->cmsg_type
) {
1931 if (!ns_capable(sock_net(sk
)->user_ns
, CAP_NET_ADMIN
))
1933 if (cmsg
->cmsg_len
!= CMSG_LEN(sizeof(u32
)))
1935 sockc
->mark
= *(u32
*)CMSG_DATA(cmsg
);
1937 case SO_TIMESTAMPING
:
1938 if (cmsg
->cmsg_len
!= CMSG_LEN(sizeof(u32
)))
1941 tsflags
= *(u32
*)CMSG_DATA(cmsg
);
1942 if (tsflags
& ~SOF_TIMESTAMPING_TX_RECORD_MASK
)
1945 sockc
->tsflags
&= ~SOF_TIMESTAMPING_TX_RECORD_MASK
;
1946 sockc
->tsflags
|= tsflags
;
1948 /* SCM_RIGHTS and SCM_CREDENTIALS are semantically in SOL_UNIX. */
1950 case SCM_CREDENTIALS
:
1957 EXPORT_SYMBOL(__sock_cmsg_send
);
1959 int sock_cmsg_send(struct sock
*sk
, struct msghdr
*msg
,
1960 struct sockcm_cookie
*sockc
)
1962 struct cmsghdr
*cmsg
;
1965 for_each_cmsghdr(cmsg
, msg
) {
1966 if (!CMSG_OK(msg
, cmsg
))
1968 if (cmsg
->cmsg_level
!= SOL_SOCKET
)
1970 ret
= __sock_cmsg_send(sk
, msg
, cmsg
, sockc
);
1976 EXPORT_SYMBOL(sock_cmsg_send
);
1978 /* On 32bit arches, an skb frag is limited to 2^15 */
1979 #define SKB_FRAG_PAGE_ORDER get_order(32768)
1982 * skb_page_frag_refill - check that a page_frag contains enough room
1983 * @sz: minimum size of the fragment we want to get
1984 * @pfrag: pointer to page_frag
1985 * @gfp: priority for memory allocation
1987 * Note: While this allocator tries to use high order pages, there is
1988 * no guarantee that allocations succeed. Therefore, @sz MUST be
1989 * less or equal than PAGE_SIZE.
1991 bool skb_page_frag_refill(unsigned int sz
, struct page_frag
*pfrag
, gfp_t gfp
)
1994 if (page_ref_count(pfrag
->page
) == 1) {
1998 if (pfrag
->offset
+ sz
<= pfrag
->size
)
2000 put_page(pfrag
->page
);
2004 if (SKB_FRAG_PAGE_ORDER
) {
2005 /* Avoid direct reclaim but allow kswapd to wake */
2006 pfrag
->page
= alloc_pages((gfp
& ~__GFP_DIRECT_RECLAIM
) |
2007 __GFP_COMP
| __GFP_NOWARN
|
2009 SKB_FRAG_PAGE_ORDER
);
2010 if (likely(pfrag
->page
)) {
2011 pfrag
->size
= PAGE_SIZE
<< SKB_FRAG_PAGE_ORDER
;
2015 pfrag
->page
= alloc_page(gfp
);
2016 if (likely(pfrag
->page
)) {
2017 pfrag
->size
= PAGE_SIZE
;
2022 EXPORT_SYMBOL(skb_page_frag_refill
);
2024 bool sk_page_frag_refill(struct sock
*sk
, struct page_frag
*pfrag
)
2026 if (likely(skb_page_frag_refill(32U, pfrag
, sk
->sk_allocation
)))
2029 sk_enter_memory_pressure(sk
);
2030 sk_stream_moderate_sndbuf(sk
);
2033 EXPORT_SYMBOL(sk_page_frag_refill
);
2035 static void __lock_sock(struct sock
*sk
)
2036 __releases(&sk
->sk_lock
.slock
)
2037 __acquires(&sk
->sk_lock
.slock
)
2042 prepare_to_wait_exclusive(&sk
->sk_lock
.wq
, &wait
,
2043 TASK_UNINTERRUPTIBLE
);
2044 spin_unlock_bh(&sk
->sk_lock
.slock
);
2046 spin_lock_bh(&sk
->sk_lock
.slock
);
2047 if (!sock_owned_by_user(sk
))
2050 finish_wait(&sk
->sk_lock
.wq
, &wait
);
2053 static void __release_sock(struct sock
*sk
)
2054 __releases(&sk
->sk_lock
.slock
)
2055 __acquires(&sk
->sk_lock
.slock
)
2057 struct sk_buff
*skb
, *next
;
2059 while ((skb
= sk
->sk_backlog
.head
) != NULL
) {
2060 sk
->sk_backlog
.head
= sk
->sk_backlog
.tail
= NULL
;
2062 spin_unlock_bh(&sk
->sk_lock
.slock
);
2067 WARN_ON_ONCE(skb_dst_is_noref(skb
));
2069 sk_backlog_rcv(sk
, skb
);
2074 } while (skb
!= NULL
);
2076 spin_lock_bh(&sk
->sk_lock
.slock
);
2080 * Doing the zeroing here guarantee we can not loop forever
2081 * while a wild producer attempts to flood us.
2083 sk
->sk_backlog
.len
= 0;
2086 void __sk_flush_backlog(struct sock
*sk
)
2088 spin_lock_bh(&sk
->sk_lock
.slock
);
2090 spin_unlock_bh(&sk
->sk_lock
.slock
);
2094 * sk_wait_data - wait for data to arrive at sk_receive_queue
2095 * @sk: sock to wait on
2096 * @timeo: for how long
2097 * @skb: last skb seen on sk_receive_queue
2099 * Now socket state including sk->sk_err is changed only under lock,
2100 * hence we may omit checks after joining wait queue.
2101 * We check receive queue before schedule() only as optimization;
2102 * it is very likely that release_sock() added new data.
2104 int sk_wait_data(struct sock
*sk
, long *timeo
, const struct sk_buff
*skb
)
2106 DEFINE_WAIT_FUNC(wait
, woken_wake_function
);
2109 add_wait_queue(sk_sleep(sk
), &wait
);
2110 sk_set_bit(SOCKWQ_ASYNC_WAITDATA
, sk
);
2111 rc
= sk_wait_event(sk
, timeo
, skb_peek_tail(&sk
->sk_receive_queue
) != skb
, &wait
);
2112 sk_clear_bit(SOCKWQ_ASYNC_WAITDATA
, sk
);
2113 remove_wait_queue(sk_sleep(sk
), &wait
);
2116 EXPORT_SYMBOL(sk_wait_data
);
2119 * __sk_mem_raise_allocated - increase memory_allocated
2121 * @size: memory size to allocate
2122 * @amt: pages to allocate
2123 * @kind: allocation type
2125 * Similar to __sk_mem_schedule(), but does not update sk_forward_alloc
2127 int __sk_mem_raise_allocated(struct sock
*sk
, int size
, int amt
, int kind
)
2129 struct proto
*prot
= sk
->sk_prot
;
2130 long allocated
= sk_memory_allocated_add(sk
, amt
);
2132 if (mem_cgroup_sockets_enabled
&& sk
->sk_memcg
&&
2133 !mem_cgroup_charge_skmem(sk
->sk_memcg
, amt
))
2134 goto suppress_allocation
;
2137 if (allocated
<= sk_prot_mem_limits(sk
, 0)) {
2138 sk_leave_memory_pressure(sk
);
2142 /* Under pressure. */
2143 if (allocated
> sk_prot_mem_limits(sk
, 1))
2144 sk_enter_memory_pressure(sk
);
2146 /* Over hard limit. */
2147 if (allocated
> sk_prot_mem_limits(sk
, 2))
2148 goto suppress_allocation
;
2150 /* guarantee minimum buffer size under pressure */
2151 if (kind
== SK_MEM_RECV
) {
2152 if (atomic_read(&sk
->sk_rmem_alloc
) < prot
->sysctl_rmem
[0])
2155 } else { /* SK_MEM_SEND */
2156 if (sk
->sk_type
== SOCK_STREAM
) {
2157 if (sk
->sk_wmem_queued
< prot
->sysctl_wmem
[0])
2159 } else if (atomic_read(&sk
->sk_wmem_alloc
) <
2160 prot
->sysctl_wmem
[0])
2164 if (sk_has_memory_pressure(sk
)) {
2167 if (!sk_under_memory_pressure(sk
))
2169 alloc
= sk_sockets_allocated_read_positive(sk
);
2170 if (sk_prot_mem_limits(sk
, 2) > alloc
*
2171 sk_mem_pages(sk
->sk_wmem_queued
+
2172 atomic_read(&sk
->sk_rmem_alloc
) +
2173 sk
->sk_forward_alloc
))
2177 suppress_allocation
:
2179 if (kind
== SK_MEM_SEND
&& sk
->sk_type
== SOCK_STREAM
) {
2180 sk_stream_moderate_sndbuf(sk
);
2182 /* Fail only if socket is _under_ its sndbuf.
2183 * In this case we cannot block, so that we have to fail.
2185 if (sk
->sk_wmem_queued
+ size
>= sk
->sk_sndbuf
)
2189 trace_sock_exceed_buf_limit(sk
, prot
, allocated
);
2191 sk_memory_allocated_sub(sk
, amt
);
2193 if (mem_cgroup_sockets_enabled
&& sk
->sk_memcg
)
2194 mem_cgroup_uncharge_skmem(sk
->sk_memcg
, amt
);
2198 EXPORT_SYMBOL(__sk_mem_raise_allocated
);
2201 * __sk_mem_schedule - increase sk_forward_alloc and memory_allocated
2203 * @size: memory size to allocate
2204 * @kind: allocation type
2206 * If kind is SK_MEM_SEND, it means wmem allocation. Otherwise it means
2207 * rmem allocation. This function assumes that protocols which have
2208 * memory_pressure use sk_wmem_queued as write buffer accounting.
2210 int __sk_mem_schedule(struct sock
*sk
, int size
, int kind
)
2212 int ret
, amt
= sk_mem_pages(size
);
2214 sk
->sk_forward_alloc
+= amt
<< SK_MEM_QUANTUM_SHIFT
;
2215 ret
= __sk_mem_raise_allocated(sk
, size
, amt
, kind
);
2217 sk
->sk_forward_alloc
-= amt
<< SK_MEM_QUANTUM_SHIFT
;
2220 EXPORT_SYMBOL(__sk_mem_schedule
);
2223 * __sk_mem_reduce_allocated - reclaim memory_allocated
2225 * @amount: number of quanta
2227 * Similar to __sk_mem_reclaim(), but does not update sk_forward_alloc
2229 void __sk_mem_reduce_allocated(struct sock
*sk
, int amount
)
2231 sk_memory_allocated_sub(sk
, amount
);
2233 if (mem_cgroup_sockets_enabled
&& sk
->sk_memcg
)
2234 mem_cgroup_uncharge_skmem(sk
->sk_memcg
, amount
);
2236 if (sk_under_memory_pressure(sk
) &&
2237 (sk_memory_allocated(sk
) < sk_prot_mem_limits(sk
, 0)))
2238 sk_leave_memory_pressure(sk
);
2240 EXPORT_SYMBOL(__sk_mem_reduce_allocated
);
2243 * __sk_mem_reclaim - reclaim sk_forward_alloc and memory_allocated
2245 * @amount: number of bytes (rounded down to a SK_MEM_QUANTUM multiple)
2247 void __sk_mem_reclaim(struct sock
*sk
, int amount
)
2249 amount
>>= SK_MEM_QUANTUM_SHIFT
;
2250 sk
->sk_forward_alloc
-= amount
<< SK_MEM_QUANTUM_SHIFT
;
2251 __sk_mem_reduce_allocated(sk
, amount
);
2253 EXPORT_SYMBOL(__sk_mem_reclaim
);
2255 int sk_set_peek_off(struct sock
*sk
, int val
)
2260 sk
->sk_peek_off
= val
;
2263 EXPORT_SYMBOL_GPL(sk_set_peek_off
);
2266 * Set of default routines for initialising struct proto_ops when
2267 * the protocol does not support a particular function. In certain
2268 * cases where it makes no sense for a protocol to have a "do nothing"
2269 * function, some default processing is provided.
2272 int sock_no_bind(struct socket
*sock
, struct sockaddr
*saddr
, int len
)
2276 EXPORT_SYMBOL(sock_no_bind
);
2278 int sock_no_connect(struct socket
*sock
, struct sockaddr
*saddr
,
2283 EXPORT_SYMBOL(sock_no_connect
);
2285 int sock_no_socketpair(struct socket
*sock1
, struct socket
*sock2
)
2289 EXPORT_SYMBOL(sock_no_socketpair
);
2291 int sock_no_accept(struct socket
*sock
, struct socket
*newsock
, int flags
,
2296 EXPORT_SYMBOL(sock_no_accept
);
2298 int sock_no_getname(struct socket
*sock
, struct sockaddr
*saddr
,
2303 EXPORT_SYMBOL(sock_no_getname
);
2305 unsigned int sock_no_poll(struct file
*file
, struct socket
*sock
, poll_table
*pt
)
2309 EXPORT_SYMBOL(sock_no_poll
);
2311 int sock_no_ioctl(struct socket
*sock
, unsigned int cmd
, unsigned long arg
)
2315 EXPORT_SYMBOL(sock_no_ioctl
);
2317 int sock_no_listen(struct socket
*sock
, int backlog
)
2321 EXPORT_SYMBOL(sock_no_listen
);
2323 int sock_no_shutdown(struct socket
*sock
, int how
)
2327 EXPORT_SYMBOL(sock_no_shutdown
);
2329 int sock_no_setsockopt(struct socket
*sock
, int level
, int optname
,
2330 char __user
*optval
, unsigned int optlen
)
2334 EXPORT_SYMBOL(sock_no_setsockopt
);
2336 int sock_no_getsockopt(struct socket
*sock
, int level
, int optname
,
2337 char __user
*optval
, int __user
*optlen
)
2341 EXPORT_SYMBOL(sock_no_getsockopt
);
2343 int sock_no_sendmsg(struct socket
*sock
, struct msghdr
*m
, size_t len
)
2347 EXPORT_SYMBOL(sock_no_sendmsg
);
2349 int sock_no_recvmsg(struct socket
*sock
, struct msghdr
*m
, size_t len
,
2354 EXPORT_SYMBOL(sock_no_recvmsg
);
2356 int sock_no_mmap(struct file
*file
, struct socket
*sock
, struct vm_area_struct
*vma
)
2358 /* Mirror missing mmap method error code */
2361 EXPORT_SYMBOL(sock_no_mmap
);
2363 ssize_t
sock_no_sendpage(struct socket
*sock
, struct page
*page
, int offset
, size_t size
, int flags
)
2366 struct msghdr msg
= {.msg_flags
= flags
};
2368 char *kaddr
= kmap(page
);
2369 iov
.iov_base
= kaddr
+ offset
;
2371 res
= kernel_sendmsg(sock
, &msg
, &iov
, 1, size
);
2375 EXPORT_SYMBOL(sock_no_sendpage
);
2378 * Default Socket Callbacks
2381 static void sock_def_wakeup(struct sock
*sk
)
2383 struct socket_wq
*wq
;
2386 wq
= rcu_dereference(sk
->sk_wq
);
2387 if (skwq_has_sleeper(wq
))
2388 wake_up_interruptible_all(&wq
->wait
);
2392 static void sock_def_error_report(struct sock
*sk
)
2394 struct socket_wq
*wq
;
2397 wq
= rcu_dereference(sk
->sk_wq
);
2398 if (skwq_has_sleeper(wq
))
2399 wake_up_interruptible_poll(&wq
->wait
, POLLERR
);
2400 sk_wake_async(sk
, SOCK_WAKE_IO
, POLL_ERR
);
2404 static void sock_def_readable(struct sock
*sk
)
2406 struct socket_wq
*wq
;
2409 wq
= rcu_dereference(sk
->sk_wq
);
2410 if (skwq_has_sleeper(wq
))
2411 wake_up_interruptible_sync_poll(&wq
->wait
, POLLIN
| POLLPRI
|
2412 POLLRDNORM
| POLLRDBAND
);
2413 sk_wake_async(sk
, SOCK_WAKE_WAITD
, POLL_IN
);
2417 static void sock_def_write_space(struct sock
*sk
)
2419 struct socket_wq
*wq
;
2423 /* Do not wake up a writer until he can make "significant"
2426 if ((atomic_read(&sk
->sk_wmem_alloc
) << 1) <= sk
->sk_sndbuf
) {
2427 wq
= rcu_dereference(sk
->sk_wq
);
2428 if (skwq_has_sleeper(wq
))
2429 wake_up_interruptible_sync_poll(&wq
->wait
, POLLOUT
|
2430 POLLWRNORM
| POLLWRBAND
);
2432 /* Should agree with poll, otherwise some programs break */
2433 if (sock_writeable(sk
))
2434 sk_wake_async(sk
, SOCK_WAKE_SPACE
, POLL_OUT
);
2440 static void sock_def_destruct(struct sock
*sk
)
2444 void sk_send_sigurg(struct sock
*sk
)
2446 if (sk
->sk_socket
&& sk
->sk_socket
->file
)
2447 if (send_sigurg(&sk
->sk_socket
->file
->f_owner
))
2448 sk_wake_async(sk
, SOCK_WAKE_URG
, POLL_PRI
);
2450 EXPORT_SYMBOL(sk_send_sigurg
);
2452 void sk_reset_timer(struct sock
*sk
, struct timer_list
* timer
,
2453 unsigned long expires
)
2455 if (!mod_timer(timer
, expires
))
2458 EXPORT_SYMBOL(sk_reset_timer
);
2460 void sk_stop_timer(struct sock
*sk
, struct timer_list
* timer
)
2462 if (del_timer(timer
))
2465 EXPORT_SYMBOL(sk_stop_timer
);
2467 void sock_init_data(struct socket
*sock
, struct sock
*sk
)
2469 skb_queue_head_init(&sk
->sk_receive_queue
);
2470 skb_queue_head_init(&sk
->sk_write_queue
);
2471 skb_queue_head_init(&sk
->sk_error_queue
);
2473 sk
->sk_send_head
= NULL
;
2475 init_timer(&sk
->sk_timer
);
2477 sk
->sk_allocation
= GFP_KERNEL
;
2478 sk
->sk_rcvbuf
= sysctl_rmem_default
;
2479 sk
->sk_sndbuf
= sysctl_wmem_default
;
2480 sk
->sk_state
= TCP_CLOSE
;
2481 sk_set_socket(sk
, sock
);
2483 sock_set_flag(sk
, SOCK_ZAPPED
);
2486 sk
->sk_type
= sock
->type
;
2487 sk
->sk_wq
= sock
->wq
;
2489 sk
->sk_uid
= SOCK_INODE(sock
)->i_uid
;
2492 sk
->sk_uid
= make_kuid(sock_net(sk
)->user_ns
, 0);
2495 rwlock_init(&sk
->sk_callback_lock
);
2496 if (sk
->sk_kern_sock
)
2497 lockdep_set_class_and_name(
2498 &sk
->sk_callback_lock
,
2499 af_kern_callback_keys
+ sk
->sk_family
,
2500 af_family_kern_clock_key_strings
[sk
->sk_family
]);
2502 lockdep_set_class_and_name(
2503 &sk
->sk_callback_lock
,
2504 af_callback_keys
+ sk
->sk_family
,
2505 af_family_clock_key_strings
[sk
->sk_family
]);
2507 sk
->sk_state_change
= sock_def_wakeup
;
2508 sk
->sk_data_ready
= sock_def_readable
;
2509 sk
->sk_write_space
= sock_def_write_space
;
2510 sk
->sk_error_report
= sock_def_error_report
;
2511 sk
->sk_destruct
= sock_def_destruct
;
2513 sk
->sk_frag
.page
= NULL
;
2514 sk
->sk_frag
.offset
= 0;
2515 sk
->sk_peek_off
= -1;
2517 sk
->sk_peer_pid
= NULL
;
2518 sk
->sk_peer_cred
= NULL
;
2519 sk
->sk_write_pending
= 0;
2520 sk
->sk_rcvlowat
= 1;
2521 sk
->sk_rcvtimeo
= MAX_SCHEDULE_TIMEOUT
;
2522 sk
->sk_sndtimeo
= MAX_SCHEDULE_TIMEOUT
;
2524 sk
->sk_stamp
= ktime_set(-1L, 0);
2526 #ifdef CONFIG_NET_RX_BUSY_POLL
2528 sk
->sk_ll_usec
= sysctl_net_busy_read
;
2531 sk
->sk_max_pacing_rate
= ~0U;
2532 sk
->sk_pacing_rate
= ~0U;
2533 sk
->sk_incoming_cpu
= -1;
2535 * Before updating sk_refcnt, we must commit prior changes to memory
2536 * (Documentation/RCU/rculist_nulls.txt for details)
2539 atomic_set(&sk
->sk_refcnt
, 1);
2540 atomic_set(&sk
->sk_drops
, 0);
2542 EXPORT_SYMBOL(sock_init_data
);
2544 void lock_sock_nested(struct sock
*sk
, int subclass
)
2547 spin_lock_bh(&sk
->sk_lock
.slock
);
2548 if (sk
->sk_lock
.owned
)
2550 sk
->sk_lock
.owned
= 1;
2551 spin_unlock(&sk
->sk_lock
.slock
);
2553 * The sk_lock has mutex_lock() semantics here:
2555 mutex_acquire(&sk
->sk_lock
.dep_map
, subclass
, 0, _RET_IP_
);
2558 EXPORT_SYMBOL(lock_sock_nested
);
2560 void release_sock(struct sock
*sk
)
2562 spin_lock_bh(&sk
->sk_lock
.slock
);
2563 if (sk
->sk_backlog
.tail
)
2566 /* Warning : release_cb() might need to release sk ownership,
2567 * ie call sock_release_ownership(sk) before us.
2569 if (sk
->sk_prot
->release_cb
)
2570 sk
->sk_prot
->release_cb(sk
);
2572 sock_release_ownership(sk
);
2573 if (waitqueue_active(&sk
->sk_lock
.wq
))
2574 wake_up(&sk
->sk_lock
.wq
);
2575 spin_unlock_bh(&sk
->sk_lock
.slock
);
2577 EXPORT_SYMBOL(release_sock
);
2580 * lock_sock_fast - fast version of lock_sock
2583 * This version should be used for very small section, where process wont block
2584 * return false if fast path is taken
2585 * sk_lock.slock locked, owned = 0, BH disabled
2586 * return true if slow path is taken
2587 * sk_lock.slock unlocked, owned = 1, BH enabled
2589 bool lock_sock_fast(struct sock
*sk
)
2592 spin_lock_bh(&sk
->sk_lock
.slock
);
2594 if (!sk
->sk_lock
.owned
)
2596 * Note : We must disable BH
2601 sk
->sk_lock
.owned
= 1;
2602 spin_unlock(&sk
->sk_lock
.slock
);
2604 * The sk_lock has mutex_lock() semantics here:
2606 mutex_acquire(&sk
->sk_lock
.dep_map
, 0, 0, _RET_IP_
);
2610 EXPORT_SYMBOL(lock_sock_fast
);
2612 int sock_get_timestamp(struct sock
*sk
, struct timeval __user
*userstamp
)
2615 if (!sock_flag(sk
, SOCK_TIMESTAMP
))
2616 sock_enable_timestamp(sk
, SOCK_TIMESTAMP
);
2617 tv
= ktime_to_timeval(sk
->sk_stamp
);
2618 if (tv
.tv_sec
== -1)
2620 if (tv
.tv_sec
== 0) {
2621 sk
->sk_stamp
= ktime_get_real();
2622 tv
= ktime_to_timeval(sk
->sk_stamp
);
2624 return copy_to_user(userstamp
, &tv
, sizeof(tv
)) ? -EFAULT
: 0;
2626 EXPORT_SYMBOL(sock_get_timestamp
);
2628 int sock_get_timestampns(struct sock
*sk
, struct timespec __user
*userstamp
)
2631 if (!sock_flag(sk
, SOCK_TIMESTAMP
))
2632 sock_enable_timestamp(sk
, SOCK_TIMESTAMP
);
2633 ts
= ktime_to_timespec(sk
->sk_stamp
);
2634 if (ts
.tv_sec
== -1)
2636 if (ts
.tv_sec
== 0) {
2637 sk
->sk_stamp
= ktime_get_real();
2638 ts
= ktime_to_timespec(sk
->sk_stamp
);
2640 return copy_to_user(userstamp
, &ts
, sizeof(ts
)) ? -EFAULT
: 0;
2642 EXPORT_SYMBOL(sock_get_timestampns
);
2644 void sock_enable_timestamp(struct sock
*sk
, int flag
)
2646 if (!sock_flag(sk
, flag
)) {
2647 unsigned long previous_flags
= sk
->sk_flags
;
2649 sock_set_flag(sk
, flag
);
2651 * we just set one of the two flags which require net
2652 * time stamping, but time stamping might have been on
2653 * already because of the other one
2655 if (sock_needs_netstamp(sk
) &&
2656 !(previous_flags
& SK_FLAGS_TIMESTAMP
))
2657 net_enable_timestamp();
2661 int sock_recv_errqueue(struct sock
*sk
, struct msghdr
*msg
, int len
,
2662 int level
, int type
)
2664 struct sock_exterr_skb
*serr
;
2665 struct sk_buff
*skb
;
2669 skb
= sock_dequeue_err_skb(sk
);
2675 msg
->msg_flags
|= MSG_TRUNC
;
2678 err
= skb_copy_datagram_msg(skb
, 0, msg
, copied
);
2682 sock_recv_timestamp(msg
, sk
, skb
);
2684 serr
= SKB_EXT_ERR(skb
);
2685 put_cmsg(msg
, level
, type
, sizeof(serr
->ee
), &serr
->ee
);
2687 msg
->msg_flags
|= MSG_ERRQUEUE
;
2695 EXPORT_SYMBOL(sock_recv_errqueue
);
2698 * Get a socket option on an socket.
2700 * FIX: POSIX 1003.1g is very ambiguous here. It states that
2701 * asynchronous errors should be reported by getsockopt. We assume
2702 * this means if you specify SO_ERROR (otherwise whats the point of it).
2704 int sock_common_getsockopt(struct socket
*sock
, int level
, int optname
,
2705 char __user
*optval
, int __user
*optlen
)
2707 struct sock
*sk
= sock
->sk
;
2709 return sk
->sk_prot
->getsockopt(sk
, level
, optname
, optval
, optlen
);
2711 EXPORT_SYMBOL(sock_common_getsockopt
);
2713 #ifdef CONFIG_COMPAT
2714 int compat_sock_common_getsockopt(struct socket
*sock
, int level
, int optname
,
2715 char __user
*optval
, int __user
*optlen
)
2717 struct sock
*sk
= sock
->sk
;
2719 if (sk
->sk_prot
->compat_getsockopt
!= NULL
)
2720 return sk
->sk_prot
->compat_getsockopt(sk
, level
, optname
,
2722 return sk
->sk_prot
->getsockopt(sk
, level
, optname
, optval
, optlen
);
2724 EXPORT_SYMBOL(compat_sock_common_getsockopt
);
2727 int sock_common_recvmsg(struct socket
*sock
, struct msghdr
*msg
, size_t size
,
2730 struct sock
*sk
= sock
->sk
;
2734 err
= sk
->sk_prot
->recvmsg(sk
, msg
, size
, flags
& MSG_DONTWAIT
,
2735 flags
& ~MSG_DONTWAIT
, &addr_len
);
2737 msg
->msg_namelen
= addr_len
;
2740 EXPORT_SYMBOL(sock_common_recvmsg
);
2743 * Set socket options on an inet socket.
2745 int sock_common_setsockopt(struct socket
*sock
, int level
, int optname
,
2746 char __user
*optval
, unsigned int optlen
)
2748 struct sock
*sk
= sock
->sk
;
2750 return sk
->sk_prot
->setsockopt(sk
, level
, optname
, optval
, optlen
);
2752 EXPORT_SYMBOL(sock_common_setsockopt
);
2754 #ifdef CONFIG_COMPAT
2755 int compat_sock_common_setsockopt(struct socket
*sock
, int level
, int optname
,
2756 char __user
*optval
, unsigned int optlen
)
2758 struct sock
*sk
= sock
->sk
;
2760 if (sk
->sk_prot
->compat_setsockopt
!= NULL
)
2761 return sk
->sk_prot
->compat_setsockopt(sk
, level
, optname
,
2763 return sk
->sk_prot
->setsockopt(sk
, level
, optname
, optval
, optlen
);
2765 EXPORT_SYMBOL(compat_sock_common_setsockopt
);
2768 void sk_common_release(struct sock
*sk
)
2770 if (sk
->sk_prot
->destroy
)
2771 sk
->sk_prot
->destroy(sk
);
2774 * Observation: when sock_common_release is called, processes have
2775 * no access to socket. But net still has.
2776 * Step one, detach it from networking:
2778 * A. Remove from hash tables.
2781 sk
->sk_prot
->unhash(sk
);
2784 * In this point socket cannot receive new packets, but it is possible
2785 * that some packets are in flight because some CPU runs receiver and
2786 * did hash table lookup before we unhashed socket. They will achieve
2787 * receive queue and will be purged by socket destructor.
2789 * Also we still have packets pending on receive queue and probably,
2790 * our own packets waiting in device queues. sock_destroy will drain
2791 * receive queue, but transmitted packets will delay socket destruction
2792 * until the last reference will be released.
2797 xfrm_sk_free_policy(sk
);
2799 sk_refcnt_debug_release(sk
);
2803 EXPORT_SYMBOL(sk_common_release
);
2805 #ifdef CONFIG_PROC_FS
2806 #define PROTO_INUSE_NR 64 /* should be enough for the first time */
2808 int val
[PROTO_INUSE_NR
];
2811 static DECLARE_BITMAP(proto_inuse_idx
, PROTO_INUSE_NR
);
2813 #ifdef CONFIG_NET_NS
2814 void sock_prot_inuse_add(struct net
*net
, struct proto
*prot
, int val
)
2816 __this_cpu_add(net
->core
.inuse
->val
[prot
->inuse_idx
], val
);
2818 EXPORT_SYMBOL_GPL(sock_prot_inuse_add
);
2820 int sock_prot_inuse_get(struct net
*net
, struct proto
*prot
)
2822 int cpu
, idx
= prot
->inuse_idx
;
2825 for_each_possible_cpu(cpu
)
2826 res
+= per_cpu_ptr(net
->core
.inuse
, cpu
)->val
[idx
];
2828 return res
>= 0 ? res
: 0;
2830 EXPORT_SYMBOL_GPL(sock_prot_inuse_get
);
2832 static int __net_init
sock_inuse_init_net(struct net
*net
)
2834 net
->core
.inuse
= alloc_percpu(struct prot_inuse
);
2835 return net
->core
.inuse
? 0 : -ENOMEM
;
2838 static void __net_exit
sock_inuse_exit_net(struct net
*net
)
2840 free_percpu(net
->core
.inuse
);
2843 static struct pernet_operations net_inuse_ops
= {
2844 .init
= sock_inuse_init_net
,
2845 .exit
= sock_inuse_exit_net
,
2848 static __init
int net_inuse_init(void)
2850 if (register_pernet_subsys(&net_inuse_ops
))
2851 panic("Cannot initialize net inuse counters");
2856 core_initcall(net_inuse_init
);
2858 static DEFINE_PER_CPU(struct prot_inuse
, prot_inuse
);
2860 void sock_prot_inuse_add(struct net
*net
, struct proto
*prot
, int val
)
2862 __this_cpu_add(prot_inuse
.val
[prot
->inuse_idx
], val
);
2864 EXPORT_SYMBOL_GPL(sock_prot_inuse_add
);
2866 int sock_prot_inuse_get(struct net
*net
, struct proto
*prot
)
2868 int cpu
, idx
= prot
->inuse_idx
;
2871 for_each_possible_cpu(cpu
)
2872 res
+= per_cpu(prot_inuse
, cpu
).val
[idx
];
2874 return res
>= 0 ? res
: 0;
2876 EXPORT_SYMBOL_GPL(sock_prot_inuse_get
);
2879 static void assign_proto_idx(struct proto
*prot
)
2881 prot
->inuse_idx
= find_first_zero_bit(proto_inuse_idx
, PROTO_INUSE_NR
);
2883 if (unlikely(prot
->inuse_idx
== PROTO_INUSE_NR
- 1)) {
2884 pr_err("PROTO_INUSE_NR exhausted\n");
2888 set_bit(prot
->inuse_idx
, proto_inuse_idx
);
2891 static void release_proto_idx(struct proto
*prot
)
2893 if (prot
->inuse_idx
!= PROTO_INUSE_NR
- 1)
2894 clear_bit(prot
->inuse_idx
, proto_inuse_idx
);
2897 static inline void assign_proto_idx(struct proto
*prot
)
2901 static inline void release_proto_idx(struct proto
*prot
)
2906 static void req_prot_cleanup(struct request_sock_ops
*rsk_prot
)
2910 kfree(rsk_prot
->slab_name
);
2911 rsk_prot
->slab_name
= NULL
;
2912 kmem_cache_destroy(rsk_prot
->slab
);
2913 rsk_prot
->slab
= NULL
;
2916 static int req_prot_init(const struct proto
*prot
)
2918 struct request_sock_ops
*rsk_prot
= prot
->rsk_prot
;
2923 rsk_prot
->slab_name
= kasprintf(GFP_KERNEL
, "request_sock_%s",
2925 if (!rsk_prot
->slab_name
)
2928 rsk_prot
->slab
= kmem_cache_create(rsk_prot
->slab_name
,
2929 rsk_prot
->obj_size
, 0,
2930 prot
->slab_flags
, NULL
);
2932 if (!rsk_prot
->slab
) {
2933 pr_crit("%s: Can't create request sock SLAB cache!\n",
2940 int proto_register(struct proto
*prot
, int alloc_slab
)
2943 prot
->slab
= kmem_cache_create(prot
->name
, prot
->obj_size
, 0,
2944 SLAB_HWCACHE_ALIGN
| prot
->slab_flags
,
2947 if (prot
->slab
== NULL
) {
2948 pr_crit("%s: Can't create sock SLAB cache!\n",
2953 if (req_prot_init(prot
))
2954 goto out_free_request_sock_slab
;
2956 if (prot
->twsk_prot
!= NULL
) {
2957 prot
->twsk_prot
->twsk_slab_name
= kasprintf(GFP_KERNEL
, "tw_sock_%s", prot
->name
);
2959 if (prot
->twsk_prot
->twsk_slab_name
== NULL
)
2960 goto out_free_request_sock_slab
;
2962 prot
->twsk_prot
->twsk_slab
=
2963 kmem_cache_create(prot
->twsk_prot
->twsk_slab_name
,
2964 prot
->twsk_prot
->twsk_obj_size
,
2968 if (prot
->twsk_prot
->twsk_slab
== NULL
)
2969 goto out_free_timewait_sock_slab_name
;
2973 mutex_lock(&proto_list_mutex
);
2974 list_add(&prot
->node
, &proto_list
);
2975 assign_proto_idx(prot
);
2976 mutex_unlock(&proto_list_mutex
);
2979 out_free_timewait_sock_slab_name
:
2980 kfree(prot
->twsk_prot
->twsk_slab_name
);
2981 out_free_request_sock_slab
:
2982 req_prot_cleanup(prot
->rsk_prot
);
2984 kmem_cache_destroy(prot
->slab
);
2989 EXPORT_SYMBOL(proto_register
);
2991 void proto_unregister(struct proto
*prot
)
2993 mutex_lock(&proto_list_mutex
);
2994 release_proto_idx(prot
);
2995 list_del(&prot
->node
);
2996 mutex_unlock(&proto_list_mutex
);
2998 kmem_cache_destroy(prot
->slab
);
3001 req_prot_cleanup(prot
->rsk_prot
);
3003 if (prot
->twsk_prot
!= NULL
&& prot
->twsk_prot
->twsk_slab
!= NULL
) {
3004 kmem_cache_destroy(prot
->twsk_prot
->twsk_slab
);
3005 kfree(prot
->twsk_prot
->twsk_slab_name
);
3006 prot
->twsk_prot
->twsk_slab
= NULL
;
3009 EXPORT_SYMBOL(proto_unregister
);
3011 #ifdef CONFIG_PROC_FS
3012 static void *proto_seq_start(struct seq_file
*seq
, loff_t
*pos
)
3013 __acquires(proto_list_mutex
)
3015 mutex_lock(&proto_list_mutex
);
3016 return seq_list_start_head(&proto_list
, *pos
);
3019 static void *proto_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
3021 return seq_list_next(v
, &proto_list
, pos
);
3024 static void proto_seq_stop(struct seq_file
*seq
, void *v
)
3025 __releases(proto_list_mutex
)
3027 mutex_unlock(&proto_list_mutex
);
3030 static char proto_method_implemented(const void *method
)
3032 return method
== NULL
? 'n' : 'y';
3034 static long sock_prot_memory_allocated(struct proto
*proto
)
3036 return proto
->memory_allocated
!= NULL
? proto_memory_allocated(proto
) : -1L;
3039 static char *sock_prot_memory_pressure(struct proto
*proto
)
3041 return proto
->memory_pressure
!= NULL
?
3042 proto_memory_pressure(proto
) ? "yes" : "no" : "NI";
3045 static void proto_seq_printf(struct seq_file
*seq
, struct proto
*proto
)
3048 seq_printf(seq
, "%-9s %4u %6d %6ld %-3s %6u %-3s %-10s "
3049 "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n",
3052 sock_prot_inuse_get(seq_file_net(seq
), proto
),
3053 sock_prot_memory_allocated(proto
),
3054 sock_prot_memory_pressure(proto
),
3056 proto
->slab
== NULL
? "no" : "yes",
3057 module_name(proto
->owner
),
3058 proto_method_implemented(proto
->close
),
3059 proto_method_implemented(proto
->connect
),
3060 proto_method_implemented(proto
->disconnect
),
3061 proto_method_implemented(proto
->accept
),
3062 proto_method_implemented(proto
->ioctl
),
3063 proto_method_implemented(proto
->init
),
3064 proto_method_implemented(proto
->destroy
),
3065 proto_method_implemented(proto
->shutdown
),
3066 proto_method_implemented(proto
->setsockopt
),
3067 proto_method_implemented(proto
->getsockopt
),
3068 proto_method_implemented(proto
->sendmsg
),
3069 proto_method_implemented(proto
->recvmsg
),
3070 proto_method_implemented(proto
->sendpage
),
3071 proto_method_implemented(proto
->bind
),
3072 proto_method_implemented(proto
->backlog_rcv
),
3073 proto_method_implemented(proto
->hash
),
3074 proto_method_implemented(proto
->unhash
),
3075 proto_method_implemented(proto
->get_port
),
3076 proto_method_implemented(proto
->enter_memory_pressure
));
3079 static int proto_seq_show(struct seq_file
*seq
, void *v
)
3081 if (v
== &proto_list
)
3082 seq_printf(seq
, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s",
3091 "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n");
3093 proto_seq_printf(seq
, list_entry(v
, struct proto
, node
));
3097 static const struct seq_operations proto_seq_ops
= {
3098 .start
= proto_seq_start
,
3099 .next
= proto_seq_next
,
3100 .stop
= proto_seq_stop
,
3101 .show
= proto_seq_show
,
3104 static int proto_seq_open(struct inode
*inode
, struct file
*file
)
3106 return seq_open_net(inode
, file
, &proto_seq_ops
,
3107 sizeof(struct seq_net_private
));
3110 static const struct file_operations proto_seq_fops
= {
3111 .owner
= THIS_MODULE
,
3112 .open
= proto_seq_open
,
3114 .llseek
= seq_lseek
,
3115 .release
= seq_release_net
,
3118 static __net_init
int proto_init_net(struct net
*net
)
3120 if (!proc_create("protocols", S_IRUGO
, net
->proc_net
, &proto_seq_fops
))
3126 static __net_exit
void proto_exit_net(struct net
*net
)
3128 remove_proc_entry("protocols", net
->proc_net
);
3132 static __net_initdata
struct pernet_operations proto_net_ops
= {
3133 .init
= proto_init_net
,
3134 .exit
= proto_exit_net
,
3137 static int __init
proto_init(void)
3139 return register_pernet_subsys(&proto_net_ops
);
3142 subsys_initcall(proto_init
);
3144 #endif /* PROC_FS */