2 * NET An implementation of the SOCKET network access protocol.
4 * Version: @(#)socket.c 1.1.93 18/02/95
6 * Authors: Orest Zborowski, <obz@Kodak.COM>
8 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
11 * Anonymous : NOTSOCK/BADF cleanup. Error fix in
13 * Alan Cox : verify_area() fixes
14 * Alan Cox : Removed DDI
15 * Jonathan Kamens : SOCK_DGRAM reconnect bug
16 * Alan Cox : Moved a load of checks to the very
18 * Alan Cox : Move address structures to/from user
19 * mode above the protocol layers.
20 * Rob Janssen : Allow 0 length sends.
21 * Alan Cox : Asynchronous I/O support (cribbed from the
23 * Niibe Yutaka : Asynchronous I/O for writes (4.4BSD style)
24 * Jeff Uphoff : Made max number of sockets command-line
26 * Matti Aarnio : Made the number of sockets dynamic,
27 * to be allocated when needed, and mr.
28 * Uphoff's max is used as max to be
29 * allowed to allocate.
30 * Linus : Argh. removed all the socket allocation
31 * altogether: it's in the inode now.
32 * Alan Cox : Made sock_alloc()/sock_release() public
33 * for NetROM and future kernel nfsd type
35 * Alan Cox : sendmsg/recvmsg basics.
36 * Tom Dyas : Export net symbols.
37 * Marcin Dalecki : Fixed problems with CONFIG_NET="n".
38 * Alan Cox : Added thread locking to sys_* calls
39 * for sockets. May have errors at the
41 * Kevin Buhr : Fixed the dumb errors in the above.
42 * Andi Kleen : Some small cleanups, optimizations,
43 * and fixed a copy_from_user() bug.
44 * Tigran Aivazian : sys_send(args) calls sys_sendto(args, NULL, 0)
45 * Tigran Aivazian : Made listen(2) backlog sanity checks
46 * protocol-independent
49 * This program is free software; you can redistribute it and/or
50 * modify it under the terms of the GNU General Public License
51 * as published by the Free Software Foundation; either version
52 * 2 of the License, or (at your option) any later version.
55 * This module is effectively the top level interface to the BSD socket
58 * Based upon Swansea University Computer Society NET3.039
62 #include <linux/socket.h>
63 #include <linux/file.h>
64 #include <linux/net.h>
65 #include <linux/interrupt.h>
66 #include <linux/thread_info.h>
67 #include <linux/rcupdate.h>
68 #include <linux/netdevice.h>
69 #include <linux/proc_fs.h>
70 #include <linux/seq_file.h>
71 #include <linux/mutex.h>
72 #include <linux/if_bridge.h>
73 #include <linux/if_frad.h>
74 #include <linux/if_vlan.h>
75 #include <linux/ptp_classify.h>
76 #include <linux/init.h>
77 #include <linux/poll.h>
78 #include <linux/cache.h>
79 #include <linux/module.h>
80 #include <linux/highmem.h>
81 #include <linux/mount.h>
82 #include <linux/security.h>
83 #include <linux/syscalls.h>
84 #include <linux/compat.h>
85 #include <linux/kmod.h>
86 #include <linux/audit.h>
87 #include <linux/wireless.h>
88 #include <linux/nsproxy.h>
89 #include <linux/magic.h>
90 #include <linux/slab.h>
91 #include <linux/xattr.h>
93 #include <linux/uaccess.h>
94 #include <asm/unistd.h>
96 #include <net/compat.h>
98 #include <net/cls_cgroup.h>
100 #include <net/sock.h>
101 #include <linux/netfilter.h>
103 #include <linux/if_tun.h>
104 #include <linux/ipv6_route.h>
105 #include <linux/route.h>
106 #include <linux/sockios.h>
107 #include <net/busy_poll.h>
108 #include <linux/errqueue.h>
110 #ifdef CONFIG_NET_RX_BUSY_POLL
111 unsigned int sysctl_net_busy_read __read_mostly
;
112 unsigned int sysctl_net_busy_poll __read_mostly
;
115 static ssize_t
sock_read_iter(struct kiocb
*iocb
, struct iov_iter
*to
);
116 static ssize_t
sock_write_iter(struct kiocb
*iocb
, struct iov_iter
*from
);
117 static int sock_mmap(struct file
*file
, struct vm_area_struct
*vma
);
119 static int sock_close(struct inode
*inode
, struct file
*file
);
120 static __poll_t
sock_poll(struct file
*file
,
121 struct poll_table_struct
*wait
);
122 static long sock_ioctl(struct file
*file
, unsigned int cmd
, unsigned long arg
);
124 static long compat_sock_ioctl(struct file
*file
,
125 unsigned int cmd
, unsigned long arg
);
127 static int sock_fasync(int fd
, struct file
*filp
, int on
);
128 static ssize_t
sock_sendpage(struct file
*file
, struct page
*page
,
129 int offset
, size_t size
, loff_t
*ppos
, int more
);
130 static ssize_t
sock_splice_read(struct file
*file
, loff_t
*ppos
,
131 struct pipe_inode_info
*pipe
, size_t len
,
135 * Socket files have a set of 'special' operations as well as the generic file ones. These don't appear
136 * in the operation structures but are done directly via the socketcall() multiplexor.
139 static const struct file_operations socket_file_ops
= {
140 .owner
= THIS_MODULE
,
142 .read_iter
= sock_read_iter
,
143 .write_iter
= sock_write_iter
,
145 .unlocked_ioctl
= sock_ioctl
,
147 .compat_ioctl
= compat_sock_ioctl
,
150 .release
= sock_close
,
151 .fasync
= sock_fasync
,
152 .sendpage
= sock_sendpage
,
153 .splice_write
= generic_splice_sendpage
,
154 .splice_read
= sock_splice_read
,
158 * The protocol list. Each protocol is registered in here.
161 static DEFINE_SPINLOCK(net_family_lock
);
162 static const struct net_proto_family __rcu
*net_families
[NPROTO
] __read_mostly
;
166 * Move socket addresses back and forth across the kernel/user
167 * divide and look after the messy bits.
171 * move_addr_to_kernel - copy a socket address into kernel space
172 * @uaddr: Address in user space
173 * @kaddr: Address in kernel space
174 * @ulen: Length in user space
176 * The address is copied into kernel space. If the provided address is
177 * too long an error code of -EINVAL is returned. If the copy gives
178 * invalid addresses -EFAULT is returned. On a success 0 is returned.
181 int move_addr_to_kernel(void __user
*uaddr
, int ulen
, struct sockaddr_storage
*kaddr
)
183 if (ulen
< 0 || ulen
> sizeof(struct sockaddr_storage
))
187 if (copy_from_user(kaddr
, uaddr
, ulen
))
189 return audit_sockaddr(ulen
, kaddr
);
193 * move_addr_to_user - copy an address to user space
194 * @kaddr: kernel space address
195 * @klen: length of address in kernel
196 * @uaddr: user space address
197 * @ulen: pointer to user length field
199 * The value pointed to by ulen on entry is the buffer length available.
200 * This is overwritten with the buffer space used. -EINVAL is returned
201 * if an overlong buffer is specified or a negative buffer size. -EFAULT
202 * is returned if either the buffer or the length field are not
204 * After copying the data up to the limit the user specifies, the true
205 * length of the data is written over the length limit the user
206 * specified. Zero is returned for a success.
209 static int move_addr_to_user(struct sockaddr_storage
*kaddr
, int klen
,
210 void __user
*uaddr
, int __user
*ulen
)
215 BUG_ON(klen
> sizeof(struct sockaddr_storage
));
216 err
= get_user(len
, ulen
);
224 if (audit_sockaddr(klen
, kaddr
))
226 if (copy_to_user(uaddr
, kaddr
, len
))
230 * "fromlen shall refer to the value before truncation.."
233 return __put_user(klen
, ulen
);
236 static struct kmem_cache
*sock_inode_cachep __ro_after_init
;
238 static struct inode
*sock_alloc_inode(struct super_block
*sb
)
240 struct socket_alloc
*ei
;
241 struct socket_wq
*wq
;
243 ei
= kmem_cache_alloc(sock_inode_cachep
, GFP_KERNEL
);
246 wq
= kmalloc(sizeof(*wq
), GFP_KERNEL
);
248 kmem_cache_free(sock_inode_cachep
, ei
);
251 init_waitqueue_head(&wq
->wait
);
252 wq
->fasync_list
= NULL
;
254 RCU_INIT_POINTER(ei
->socket
.wq
, wq
);
256 ei
->socket
.state
= SS_UNCONNECTED
;
257 ei
->socket
.flags
= 0;
258 ei
->socket
.ops
= NULL
;
259 ei
->socket
.sk
= NULL
;
260 ei
->socket
.file
= NULL
;
262 return &ei
->vfs_inode
;
265 static void sock_destroy_inode(struct inode
*inode
)
267 struct socket_alloc
*ei
;
268 struct socket_wq
*wq
;
270 ei
= container_of(inode
, struct socket_alloc
, vfs_inode
);
271 wq
= rcu_dereference_protected(ei
->socket
.wq
, 1);
273 kmem_cache_free(sock_inode_cachep
, ei
);
276 static void init_once(void *foo
)
278 struct socket_alloc
*ei
= (struct socket_alloc
*)foo
;
280 inode_init_once(&ei
->vfs_inode
);
283 static void init_inodecache(void)
285 sock_inode_cachep
= kmem_cache_create("sock_inode_cache",
286 sizeof(struct socket_alloc
),
288 (SLAB_HWCACHE_ALIGN
|
289 SLAB_RECLAIM_ACCOUNT
|
290 SLAB_MEM_SPREAD
| SLAB_ACCOUNT
),
292 BUG_ON(sock_inode_cachep
== NULL
);
295 static const struct super_operations sockfs_ops
= {
296 .alloc_inode
= sock_alloc_inode
,
297 .destroy_inode
= sock_destroy_inode
,
298 .statfs
= simple_statfs
,
302 * sockfs_dname() is called from d_path().
304 static char *sockfs_dname(struct dentry
*dentry
, char *buffer
, int buflen
)
306 return dynamic_dname(dentry
, buffer
, buflen
, "socket:[%lu]",
307 d_inode(dentry
)->i_ino
);
310 static const struct dentry_operations sockfs_dentry_operations
= {
311 .d_dname
= sockfs_dname
,
314 static int sockfs_xattr_get(const struct xattr_handler
*handler
,
315 struct dentry
*dentry
, struct inode
*inode
,
316 const char *suffix
, void *value
, size_t size
)
319 if (dentry
->d_name
.len
+ 1 > size
)
321 memcpy(value
, dentry
->d_name
.name
, dentry
->d_name
.len
+ 1);
323 return dentry
->d_name
.len
+ 1;
326 #define XATTR_SOCKPROTONAME_SUFFIX "sockprotoname"
327 #define XATTR_NAME_SOCKPROTONAME (XATTR_SYSTEM_PREFIX XATTR_SOCKPROTONAME_SUFFIX)
328 #define XATTR_NAME_SOCKPROTONAME_LEN (sizeof(XATTR_NAME_SOCKPROTONAME)-1)
330 static const struct xattr_handler sockfs_xattr_handler
= {
331 .name
= XATTR_NAME_SOCKPROTONAME
,
332 .get
= sockfs_xattr_get
,
335 static int sockfs_security_xattr_set(const struct xattr_handler
*handler
,
336 struct dentry
*dentry
, struct inode
*inode
,
337 const char *suffix
, const void *value
,
338 size_t size
, int flags
)
340 /* Handled by LSM. */
344 static const struct xattr_handler sockfs_security_xattr_handler
= {
345 .prefix
= XATTR_SECURITY_PREFIX
,
346 .set
= sockfs_security_xattr_set
,
349 static const struct xattr_handler
*sockfs_xattr_handlers
[] = {
350 &sockfs_xattr_handler
,
351 &sockfs_security_xattr_handler
,
355 static struct dentry
*sockfs_mount(struct file_system_type
*fs_type
,
356 int flags
, const char *dev_name
, void *data
)
358 return mount_pseudo_xattr(fs_type
, "socket:", &sockfs_ops
,
359 sockfs_xattr_handlers
,
360 &sockfs_dentry_operations
, SOCKFS_MAGIC
);
363 static struct vfsmount
*sock_mnt __read_mostly
;
365 static struct file_system_type sock_fs_type
= {
367 .mount
= sockfs_mount
,
368 .kill_sb
= kill_anon_super
,
372 * Obtains the first available file descriptor and sets it up for use.
374 * These functions create file structures and maps them to fd space
375 * of the current process. On success it returns file descriptor
376 * and file struct implicitly stored in sock->file.
377 * Note that another thread may close file descriptor before we return
378 * from this function. We use the fact that now we do not refer
379 * to socket after mapping. If one day we will need it, this
380 * function will increment ref. count on file by 1.
382 * In any case returned fd MAY BE not valid!
383 * This race condition is unavoidable
384 * with shared fd spaces, we cannot solve it inside kernel,
385 * but we take care of internal coherence yet.
388 struct file
*sock_alloc_file(struct socket
*sock
, int flags
, const char *dname
)
390 struct qstr name
= { .name
= "" };
396 name
.len
= strlen(name
.name
);
397 } else if (sock
->sk
) {
398 name
.name
= sock
->sk
->sk_prot_creator
->name
;
399 name
.len
= strlen(name
.name
);
401 path
.dentry
= d_alloc_pseudo(sock_mnt
->mnt_sb
, &name
);
402 if (unlikely(!path
.dentry
)) {
404 return ERR_PTR(-ENOMEM
);
406 path
.mnt
= mntget(sock_mnt
);
408 d_instantiate(path
.dentry
, SOCK_INODE(sock
));
410 file
= alloc_file(&path
, FMODE_READ
| FMODE_WRITE
,
413 /* drop dentry, keep inode for a bit */
414 ihold(d_inode(path
.dentry
));
416 /* ... and now kill it properly */
422 file
->f_flags
= O_RDWR
| (flags
& O_NONBLOCK
);
423 file
->private_data
= sock
;
426 EXPORT_SYMBOL(sock_alloc_file
);
428 static int sock_map_fd(struct socket
*sock
, int flags
)
430 struct file
*newfile
;
431 int fd
= get_unused_fd_flags(flags
);
432 if (unlikely(fd
< 0)) {
437 newfile
= sock_alloc_file(sock
, flags
, NULL
);
438 if (likely(!IS_ERR(newfile
))) {
439 fd_install(fd
, newfile
);
444 return PTR_ERR(newfile
);
447 struct socket
*sock_from_file(struct file
*file
, int *err
)
449 if (file
->f_op
== &socket_file_ops
)
450 return file
->private_data
; /* set in sock_map_fd */
455 EXPORT_SYMBOL(sock_from_file
);
458 * sockfd_lookup - Go from a file number to its socket slot
460 * @err: pointer to an error code return
462 * The file handle passed in is locked and the socket it is bound
463 * to is returned. If an error occurs the err pointer is overwritten
464 * with a negative errno code and NULL is returned. The function checks
465 * for both invalid handles and passing a handle which is not a socket.
467 * On a success the socket object pointer is returned.
470 struct socket
*sockfd_lookup(int fd
, int *err
)
481 sock
= sock_from_file(file
, err
);
486 EXPORT_SYMBOL(sockfd_lookup
);
488 static struct socket
*sockfd_lookup_light(int fd
, int *err
, int *fput_needed
)
490 struct fd f
= fdget(fd
);
495 sock
= sock_from_file(f
.file
, err
);
497 *fput_needed
= f
.flags
;
505 static ssize_t
sockfs_listxattr(struct dentry
*dentry
, char *buffer
,
511 len
= security_inode_listsecurity(d_inode(dentry
), buffer
, size
);
521 len
= (XATTR_NAME_SOCKPROTONAME_LEN
+ 1);
526 memcpy(buffer
, XATTR_NAME_SOCKPROTONAME
, len
);
533 static int sockfs_setattr(struct dentry
*dentry
, struct iattr
*iattr
)
535 int err
= simple_setattr(dentry
, iattr
);
537 if (!err
&& (iattr
->ia_valid
& ATTR_UID
)) {
538 struct socket
*sock
= SOCKET_I(d_inode(dentry
));
541 sock
->sk
->sk_uid
= iattr
->ia_uid
;
549 static const struct inode_operations sockfs_inode_ops
= {
550 .listxattr
= sockfs_listxattr
,
551 .setattr
= sockfs_setattr
,
555 * sock_alloc - allocate a socket
557 * Allocate a new inode and socket object. The two are bound together
558 * and initialised. The socket is then returned. If we are out of inodes
562 struct socket
*sock_alloc(void)
567 inode
= new_inode_pseudo(sock_mnt
->mnt_sb
);
571 sock
= SOCKET_I(inode
);
573 inode
->i_ino
= get_next_ino();
574 inode
->i_mode
= S_IFSOCK
| S_IRWXUGO
;
575 inode
->i_uid
= current_fsuid();
576 inode
->i_gid
= current_fsgid();
577 inode
->i_op
= &sockfs_inode_ops
;
581 EXPORT_SYMBOL(sock_alloc
);
584 * sock_release - close a socket
585 * @sock: socket to close
587 * The socket is released from the protocol stack if it has a release
588 * callback, and the inode is then released if the socket is bound to
589 * an inode not a file.
592 static void __sock_release(struct socket
*sock
, struct inode
*inode
)
595 struct module
*owner
= sock
->ops
->owner
;
599 sock
->ops
->release(sock
);
606 if (rcu_dereference_protected(sock
->wq
, 1)->fasync_list
)
607 pr_err("%s: fasync list not empty!\n", __func__
);
610 iput(SOCK_INODE(sock
));
616 void sock_release(struct socket
*sock
)
618 __sock_release(sock
, NULL
);
620 EXPORT_SYMBOL(sock_release
);
622 void __sock_tx_timestamp(__u16 tsflags
, __u8
*tx_flags
)
624 u8 flags
= *tx_flags
;
626 if (tsflags
& SOF_TIMESTAMPING_TX_HARDWARE
)
627 flags
|= SKBTX_HW_TSTAMP
;
629 if (tsflags
& SOF_TIMESTAMPING_TX_SOFTWARE
)
630 flags
|= SKBTX_SW_TSTAMP
;
632 if (tsflags
& SOF_TIMESTAMPING_TX_SCHED
)
633 flags
|= SKBTX_SCHED_TSTAMP
;
637 EXPORT_SYMBOL(__sock_tx_timestamp
);
639 static inline int sock_sendmsg_nosec(struct socket
*sock
, struct msghdr
*msg
)
641 int ret
= sock
->ops
->sendmsg(sock
, msg
, msg_data_left(msg
));
642 BUG_ON(ret
== -EIOCBQUEUED
);
646 int sock_sendmsg(struct socket
*sock
, struct msghdr
*msg
)
648 int err
= security_socket_sendmsg(sock
, msg
,
651 return err
?: sock_sendmsg_nosec(sock
, msg
);
653 EXPORT_SYMBOL(sock_sendmsg
);
655 int kernel_sendmsg(struct socket
*sock
, struct msghdr
*msg
,
656 struct kvec
*vec
, size_t num
, size_t size
)
658 iov_iter_kvec(&msg
->msg_iter
, WRITE
| ITER_KVEC
, vec
, num
, size
);
659 return sock_sendmsg(sock
, msg
);
661 EXPORT_SYMBOL(kernel_sendmsg
);
663 int kernel_sendmsg_locked(struct sock
*sk
, struct msghdr
*msg
,
664 struct kvec
*vec
, size_t num
, size_t size
)
666 struct socket
*sock
= sk
->sk_socket
;
668 if (!sock
->ops
->sendmsg_locked
)
669 return sock_no_sendmsg_locked(sk
, msg
, size
);
671 iov_iter_kvec(&msg
->msg_iter
, WRITE
| ITER_KVEC
, vec
, num
, size
);
673 return sock
->ops
->sendmsg_locked(sk
, msg
, msg_data_left(msg
));
675 EXPORT_SYMBOL(kernel_sendmsg_locked
);
677 static bool skb_is_err_queue(const struct sk_buff
*skb
)
679 /* pkt_type of skbs enqueued on the error queue are set to
680 * PACKET_OUTGOING in skb_set_err_queue(). This is only safe to do
681 * in recvmsg, since skbs received on a local socket will never
682 * have a pkt_type of PACKET_OUTGOING.
684 return skb
->pkt_type
== PACKET_OUTGOING
;
687 /* On transmit, software and hardware timestamps are returned independently.
688 * As the two skb clones share the hardware timestamp, which may be updated
689 * before the software timestamp is received, a hardware TX timestamp may be
690 * returned only if there is no software TX timestamp. Ignore false software
691 * timestamps, which may be made in the __sock_recv_timestamp() call when the
692 * option SO_TIMESTAMP(NS) is enabled on the socket, even when the skb has a
693 * hardware timestamp.
695 static bool skb_is_swtx_tstamp(const struct sk_buff
*skb
, int false_tstamp
)
697 return skb
->tstamp
&& !false_tstamp
&& skb_is_err_queue(skb
);
700 static void put_ts_pktinfo(struct msghdr
*msg
, struct sk_buff
*skb
)
702 struct scm_ts_pktinfo ts_pktinfo
;
703 struct net_device
*orig_dev
;
705 if (!skb_mac_header_was_set(skb
))
708 memset(&ts_pktinfo
, 0, sizeof(ts_pktinfo
));
711 orig_dev
= dev_get_by_napi_id(skb_napi_id(skb
));
713 ts_pktinfo
.if_index
= orig_dev
->ifindex
;
716 ts_pktinfo
.pkt_length
= skb
->len
- skb_mac_offset(skb
);
717 put_cmsg(msg
, SOL_SOCKET
, SCM_TIMESTAMPING_PKTINFO
,
718 sizeof(ts_pktinfo
), &ts_pktinfo
);
722 * called from sock_recv_timestamp() if sock_flag(sk, SOCK_RCVTSTAMP)
724 void __sock_recv_timestamp(struct msghdr
*msg
, struct sock
*sk
,
727 int need_software_tstamp
= sock_flag(sk
, SOCK_RCVTSTAMP
);
728 struct scm_timestamping tss
;
729 int empty
= 1, false_tstamp
= 0;
730 struct skb_shared_hwtstamps
*shhwtstamps
=
733 /* Race occurred between timestamp enabling and packet
734 receiving. Fill in the current time for now. */
735 if (need_software_tstamp
&& skb
->tstamp
== 0) {
736 __net_timestamp(skb
);
740 if (need_software_tstamp
) {
741 if (!sock_flag(sk
, SOCK_RCVTSTAMPNS
)) {
743 skb_get_timestamp(skb
, &tv
);
744 put_cmsg(msg
, SOL_SOCKET
, SCM_TIMESTAMP
,
748 skb_get_timestampns(skb
, &ts
);
749 put_cmsg(msg
, SOL_SOCKET
, SCM_TIMESTAMPNS
,
754 memset(&tss
, 0, sizeof(tss
));
755 if ((sk
->sk_tsflags
& SOF_TIMESTAMPING_SOFTWARE
) &&
756 ktime_to_timespec_cond(skb
->tstamp
, tss
.ts
+ 0))
759 (sk
->sk_tsflags
& SOF_TIMESTAMPING_RAW_HARDWARE
) &&
760 !skb_is_swtx_tstamp(skb
, false_tstamp
) &&
761 ktime_to_timespec_cond(shhwtstamps
->hwtstamp
, tss
.ts
+ 2)) {
763 if ((sk
->sk_tsflags
& SOF_TIMESTAMPING_OPT_PKTINFO
) &&
764 !skb_is_err_queue(skb
))
765 put_ts_pktinfo(msg
, skb
);
768 put_cmsg(msg
, SOL_SOCKET
,
769 SCM_TIMESTAMPING
, sizeof(tss
), &tss
);
771 if (skb_is_err_queue(skb
) && skb
->len
&&
772 SKB_EXT_ERR(skb
)->opt_stats
)
773 put_cmsg(msg
, SOL_SOCKET
, SCM_TIMESTAMPING_OPT_STATS
,
774 skb
->len
, skb
->data
);
777 EXPORT_SYMBOL_GPL(__sock_recv_timestamp
);
779 void __sock_recv_wifi_status(struct msghdr
*msg
, struct sock
*sk
,
784 if (!sock_flag(sk
, SOCK_WIFI_STATUS
))
786 if (!skb
->wifi_acked_valid
)
789 ack
= skb
->wifi_acked
;
791 put_cmsg(msg
, SOL_SOCKET
, SCM_WIFI_STATUS
, sizeof(ack
), &ack
);
793 EXPORT_SYMBOL_GPL(__sock_recv_wifi_status
);
795 static inline void sock_recv_drops(struct msghdr
*msg
, struct sock
*sk
,
798 if (sock_flag(sk
, SOCK_RXQ_OVFL
) && skb
&& SOCK_SKB_CB(skb
)->dropcount
)
799 put_cmsg(msg
, SOL_SOCKET
, SO_RXQ_OVFL
,
800 sizeof(__u32
), &SOCK_SKB_CB(skb
)->dropcount
);
803 void __sock_recv_ts_and_drops(struct msghdr
*msg
, struct sock
*sk
,
806 sock_recv_timestamp(msg
, sk
, skb
);
807 sock_recv_drops(msg
, sk
, skb
);
809 EXPORT_SYMBOL_GPL(__sock_recv_ts_and_drops
);
811 static inline int sock_recvmsg_nosec(struct socket
*sock
, struct msghdr
*msg
,
814 return sock
->ops
->recvmsg(sock
, msg
, msg_data_left(msg
), flags
);
817 int sock_recvmsg(struct socket
*sock
, struct msghdr
*msg
, int flags
)
819 int err
= security_socket_recvmsg(sock
, msg
, msg_data_left(msg
), flags
);
821 return err
?: sock_recvmsg_nosec(sock
, msg
, flags
);
823 EXPORT_SYMBOL(sock_recvmsg
);
826 * kernel_recvmsg - Receive a message from a socket (kernel space)
827 * @sock: The socket to receive the message from
828 * @msg: Received message
829 * @vec: Input s/g array for message data
830 * @num: Size of input s/g array
831 * @size: Number of bytes to read
832 * @flags: Message flags (MSG_DONTWAIT, etc...)
834 * On return the msg structure contains the scatter/gather array passed in the
835 * vec argument. The array is modified so that it consists of the unfilled
836 * portion of the original array.
838 * The returned value is the total number of bytes received, or an error.
840 int kernel_recvmsg(struct socket
*sock
, struct msghdr
*msg
,
841 struct kvec
*vec
, size_t num
, size_t size
, int flags
)
843 mm_segment_t oldfs
= get_fs();
846 iov_iter_kvec(&msg
->msg_iter
, READ
| ITER_KVEC
, vec
, num
, size
);
848 result
= sock_recvmsg(sock
, msg
, flags
);
852 EXPORT_SYMBOL(kernel_recvmsg
);
854 static ssize_t
sock_sendpage(struct file
*file
, struct page
*page
,
855 int offset
, size_t size
, loff_t
*ppos
, int more
)
860 sock
= file
->private_data
;
862 flags
= (file
->f_flags
& O_NONBLOCK
) ? MSG_DONTWAIT
: 0;
863 /* more is a combination of MSG_MORE and MSG_SENDPAGE_NOTLAST */
866 return kernel_sendpage(sock
, page
, offset
, size
, flags
);
869 static ssize_t
sock_splice_read(struct file
*file
, loff_t
*ppos
,
870 struct pipe_inode_info
*pipe
, size_t len
,
873 struct socket
*sock
= file
->private_data
;
875 if (unlikely(!sock
->ops
->splice_read
))
878 return sock
->ops
->splice_read(sock
, ppos
, pipe
, len
, flags
);
881 static ssize_t
sock_read_iter(struct kiocb
*iocb
, struct iov_iter
*to
)
883 struct file
*file
= iocb
->ki_filp
;
884 struct socket
*sock
= file
->private_data
;
885 struct msghdr msg
= {.msg_iter
= *to
,
889 if (file
->f_flags
& O_NONBLOCK
)
890 msg
.msg_flags
= MSG_DONTWAIT
;
892 if (iocb
->ki_pos
!= 0)
895 if (!iov_iter_count(to
)) /* Match SYS5 behaviour */
898 res
= sock_recvmsg(sock
, &msg
, msg
.msg_flags
);
903 static ssize_t
sock_write_iter(struct kiocb
*iocb
, struct iov_iter
*from
)
905 struct file
*file
= iocb
->ki_filp
;
906 struct socket
*sock
= file
->private_data
;
907 struct msghdr msg
= {.msg_iter
= *from
,
911 if (iocb
->ki_pos
!= 0)
914 if (file
->f_flags
& O_NONBLOCK
)
915 msg
.msg_flags
= MSG_DONTWAIT
;
917 if (sock
->type
== SOCK_SEQPACKET
)
918 msg
.msg_flags
|= MSG_EOR
;
920 res
= sock_sendmsg(sock
, &msg
);
921 *from
= msg
.msg_iter
;
926 * Atomic setting of ioctl hooks to avoid race
927 * with module unload.
930 static DEFINE_MUTEX(br_ioctl_mutex
);
931 static int (*br_ioctl_hook
) (struct net
*, unsigned int cmd
, void __user
*arg
);
933 void brioctl_set(int (*hook
) (struct net
*, unsigned int, void __user
*))
935 mutex_lock(&br_ioctl_mutex
);
936 br_ioctl_hook
= hook
;
937 mutex_unlock(&br_ioctl_mutex
);
939 EXPORT_SYMBOL(brioctl_set
);
941 static DEFINE_MUTEX(vlan_ioctl_mutex
);
942 static int (*vlan_ioctl_hook
) (struct net
*, void __user
*arg
);
944 void vlan_ioctl_set(int (*hook
) (struct net
*, void __user
*))
946 mutex_lock(&vlan_ioctl_mutex
);
947 vlan_ioctl_hook
= hook
;
948 mutex_unlock(&vlan_ioctl_mutex
);
950 EXPORT_SYMBOL(vlan_ioctl_set
);
952 static DEFINE_MUTEX(dlci_ioctl_mutex
);
953 static int (*dlci_ioctl_hook
) (unsigned int, void __user
*);
955 void dlci_ioctl_set(int (*hook
) (unsigned int, void __user
*))
957 mutex_lock(&dlci_ioctl_mutex
);
958 dlci_ioctl_hook
= hook
;
959 mutex_unlock(&dlci_ioctl_mutex
);
961 EXPORT_SYMBOL(dlci_ioctl_set
);
963 static long sock_do_ioctl(struct net
*net
, struct socket
*sock
,
964 unsigned int cmd
, unsigned long arg
)
967 void __user
*argp
= (void __user
*)arg
;
969 err
= sock
->ops
->ioctl(sock
, cmd
, arg
);
972 * If this ioctl is unknown try to hand it down
975 if (err
!= -ENOIOCTLCMD
)
978 if (cmd
== SIOCGIFCONF
) {
980 if (copy_from_user(&ifc
, argp
, sizeof(struct ifconf
)))
983 err
= dev_ifconf(net
, &ifc
, sizeof(struct ifreq
));
985 if (!err
&& copy_to_user(argp
, &ifc
, sizeof(struct ifconf
)))
990 if (copy_from_user(&ifr
, argp
, sizeof(struct ifreq
)))
992 err
= dev_ioctl(net
, cmd
, &ifr
, &need_copyout
);
993 if (!err
&& need_copyout
)
994 if (copy_to_user(argp
, &ifr
, sizeof(struct ifreq
)))
1001 * With an ioctl, arg may well be a user mode pointer, but we don't know
1002 * what to do with it - that's up to the protocol still.
1005 struct ns_common
*get_net_ns(struct ns_common
*ns
)
1007 return &get_net(container_of(ns
, struct net
, ns
))->ns
;
1009 EXPORT_SYMBOL_GPL(get_net_ns
);
1011 static long sock_ioctl(struct file
*file
, unsigned cmd
, unsigned long arg
)
1013 struct socket
*sock
;
1015 void __user
*argp
= (void __user
*)arg
;
1019 sock
= file
->private_data
;
1022 if (unlikely(cmd
>= SIOCDEVPRIVATE
&& cmd
<= (SIOCDEVPRIVATE
+ 15))) {
1025 if (copy_from_user(&ifr
, argp
, sizeof(struct ifreq
)))
1027 err
= dev_ioctl(net
, cmd
, &ifr
, &need_copyout
);
1028 if (!err
&& need_copyout
)
1029 if (copy_to_user(argp
, &ifr
, sizeof(struct ifreq
)))
1032 #ifdef CONFIG_WEXT_CORE
1033 if (cmd
>= SIOCIWFIRST
&& cmd
<= SIOCIWLAST
) {
1034 err
= wext_handle_ioctl(net
, cmd
, argp
);
1041 if (get_user(pid
, (int __user
*)argp
))
1043 err
= f_setown(sock
->file
, pid
, 1);
1047 err
= put_user(f_getown(sock
->file
),
1048 (int __user
*)argp
);
1056 request_module("bridge");
1058 mutex_lock(&br_ioctl_mutex
);
1060 err
= br_ioctl_hook(net
, cmd
, argp
);
1061 mutex_unlock(&br_ioctl_mutex
);
1066 if (!vlan_ioctl_hook
)
1067 request_module("8021q");
1069 mutex_lock(&vlan_ioctl_mutex
);
1070 if (vlan_ioctl_hook
)
1071 err
= vlan_ioctl_hook(net
, argp
);
1072 mutex_unlock(&vlan_ioctl_mutex
);
1077 if (!dlci_ioctl_hook
)
1078 request_module("dlci");
1080 mutex_lock(&dlci_ioctl_mutex
);
1081 if (dlci_ioctl_hook
)
1082 err
= dlci_ioctl_hook(cmd
, argp
);
1083 mutex_unlock(&dlci_ioctl_mutex
);
1087 if (!ns_capable(net
->user_ns
, CAP_NET_ADMIN
))
1090 err
= open_related_ns(&net
->ns
, get_net_ns
);
1093 err
= sock_do_ioctl(net
, sock
, cmd
, arg
);
1099 int sock_create_lite(int family
, int type
, int protocol
, struct socket
**res
)
1102 struct socket
*sock
= NULL
;
1104 err
= security_socket_create(family
, type
, protocol
, 1);
1108 sock
= sock_alloc();
1115 err
= security_socket_post_create(sock
, family
, type
, protocol
, 1);
1127 EXPORT_SYMBOL(sock_create_lite
);
1129 /* No kernel lock held - perfect */
1130 static __poll_t
sock_poll(struct file
*file
, poll_table
*wait
)
1132 struct socket
*sock
= file
->private_data
;
1133 __poll_t events
= poll_requested_events(wait
);
1135 sock_poll_busy_loop(sock
, events
);
1136 if (!sock
->ops
->poll
)
1138 return sock
->ops
->poll(file
, sock
, wait
) | sock_poll_busy_flag(sock
);
1141 static int sock_mmap(struct file
*file
, struct vm_area_struct
*vma
)
1143 struct socket
*sock
= file
->private_data
;
1145 return sock
->ops
->mmap(file
, sock
, vma
);
1148 static int sock_close(struct inode
*inode
, struct file
*filp
)
1150 __sock_release(SOCKET_I(inode
), inode
);
1155 * Update the socket async list
1157 * Fasync_list locking strategy.
1159 * 1. fasync_list is modified only under process context socket lock
1160 * i.e. under semaphore.
1161 * 2. fasync_list is used under read_lock(&sk->sk_callback_lock)
1162 * or under socket lock
1165 static int sock_fasync(int fd
, struct file
*filp
, int on
)
1167 struct socket
*sock
= filp
->private_data
;
1168 struct sock
*sk
= sock
->sk
;
1169 struct socket_wq
*wq
;
1175 wq
= rcu_dereference_protected(sock
->wq
, lockdep_sock_is_held(sk
));
1176 fasync_helper(fd
, filp
, on
, &wq
->fasync_list
);
1178 if (!wq
->fasync_list
)
1179 sock_reset_flag(sk
, SOCK_FASYNC
);
1181 sock_set_flag(sk
, SOCK_FASYNC
);
1187 /* This function may be called only under rcu_lock */
1189 int sock_wake_async(struct socket_wq
*wq
, int how
, int band
)
1191 if (!wq
|| !wq
->fasync_list
)
1195 case SOCK_WAKE_WAITD
:
1196 if (test_bit(SOCKWQ_ASYNC_WAITDATA
, &wq
->flags
))
1199 case SOCK_WAKE_SPACE
:
1200 if (!test_and_clear_bit(SOCKWQ_ASYNC_NOSPACE
, &wq
->flags
))
1205 kill_fasync(&wq
->fasync_list
, SIGIO
, band
);
1208 kill_fasync(&wq
->fasync_list
, SIGURG
, band
);
1213 EXPORT_SYMBOL(sock_wake_async
);
1215 int __sock_create(struct net
*net
, int family
, int type
, int protocol
,
1216 struct socket
**res
, int kern
)
1219 struct socket
*sock
;
1220 const struct net_proto_family
*pf
;
1223 * Check protocol is in range
1225 if (family
< 0 || family
>= NPROTO
)
1226 return -EAFNOSUPPORT
;
1227 if (type
< 0 || type
>= SOCK_MAX
)
1232 This uglymoron is moved from INET layer to here to avoid
1233 deadlock in module load.
1235 if (family
== PF_INET
&& type
== SOCK_PACKET
) {
1236 pr_info_once("%s uses obsolete (PF_INET,SOCK_PACKET)\n",
1241 err
= security_socket_create(family
, type
, protocol
, kern
);
1246 * Allocate the socket and allow the family to set things up. if
1247 * the protocol is 0, the family is instructed to select an appropriate
1250 sock
= sock_alloc();
1252 net_warn_ratelimited("socket: no more sockets\n");
1253 return -ENFILE
; /* Not exactly a match, but its the
1254 closest posix thing */
1259 #ifdef CONFIG_MODULES
1260 /* Attempt to load a protocol module if the find failed.
1262 * 12/09/1996 Marcin: But! this makes REALLY only sense, if the user
1263 * requested real, full-featured networking support upon configuration.
1264 * Otherwise module support will break!
1266 if (rcu_access_pointer(net_families
[family
]) == NULL
)
1267 request_module("net-pf-%d", family
);
1271 pf
= rcu_dereference(net_families
[family
]);
1272 err
= -EAFNOSUPPORT
;
1277 * We will call the ->create function, that possibly is in a loadable
1278 * module, so we have to bump that loadable module refcnt first.
1280 if (!try_module_get(pf
->owner
))
1283 /* Now protected by module ref count */
1286 err
= pf
->create(net
, sock
, protocol
, kern
);
1288 goto out_module_put
;
1291 * Now to bump the refcnt of the [loadable] module that owns this
1292 * socket at sock_release time we decrement its refcnt.
1294 if (!try_module_get(sock
->ops
->owner
))
1295 goto out_module_busy
;
1298 * Now that we're done with the ->create function, the [loadable]
1299 * module can have its refcnt decremented
1301 module_put(pf
->owner
);
1302 err
= security_socket_post_create(sock
, family
, type
, protocol
, kern
);
1304 goto out_sock_release
;
1310 err
= -EAFNOSUPPORT
;
1313 module_put(pf
->owner
);
1320 goto out_sock_release
;
1322 EXPORT_SYMBOL(__sock_create
);
1324 int sock_create(int family
, int type
, int protocol
, struct socket
**res
)
1326 return __sock_create(current
->nsproxy
->net_ns
, family
, type
, protocol
, res
, 0);
1328 EXPORT_SYMBOL(sock_create
);
1330 int sock_create_kern(struct net
*net
, int family
, int type
, int protocol
, struct socket
**res
)
1332 return __sock_create(net
, family
, type
, protocol
, res
, 1);
1334 EXPORT_SYMBOL(sock_create_kern
);
1336 int __sys_socket(int family
, int type
, int protocol
)
1339 struct socket
*sock
;
1342 /* Check the SOCK_* constants for consistency. */
1343 BUILD_BUG_ON(SOCK_CLOEXEC
!= O_CLOEXEC
);
1344 BUILD_BUG_ON((SOCK_MAX
| SOCK_TYPE_MASK
) != SOCK_TYPE_MASK
);
1345 BUILD_BUG_ON(SOCK_CLOEXEC
& SOCK_TYPE_MASK
);
1346 BUILD_BUG_ON(SOCK_NONBLOCK
& SOCK_TYPE_MASK
);
1348 flags
= type
& ~SOCK_TYPE_MASK
;
1349 if (flags
& ~(SOCK_CLOEXEC
| SOCK_NONBLOCK
))
1351 type
&= SOCK_TYPE_MASK
;
1353 if (SOCK_NONBLOCK
!= O_NONBLOCK
&& (flags
& SOCK_NONBLOCK
))
1354 flags
= (flags
& ~SOCK_NONBLOCK
) | O_NONBLOCK
;
1356 retval
= sock_create(family
, type
, protocol
, &sock
);
1360 return sock_map_fd(sock
, flags
& (O_CLOEXEC
| O_NONBLOCK
));
1363 SYSCALL_DEFINE3(socket
, int, family
, int, type
, int, protocol
)
1365 return __sys_socket(family
, type
, protocol
);
1369 * Create a pair of connected sockets.
1372 int __sys_socketpair(int family
, int type
, int protocol
, int __user
*usockvec
)
1374 struct socket
*sock1
, *sock2
;
1376 struct file
*newfile1
, *newfile2
;
1379 flags
= type
& ~SOCK_TYPE_MASK
;
1380 if (flags
& ~(SOCK_CLOEXEC
| SOCK_NONBLOCK
))
1382 type
&= SOCK_TYPE_MASK
;
1384 if (SOCK_NONBLOCK
!= O_NONBLOCK
&& (flags
& SOCK_NONBLOCK
))
1385 flags
= (flags
& ~SOCK_NONBLOCK
) | O_NONBLOCK
;
1388 * reserve descriptors and make sure we won't fail
1389 * to return them to userland.
1391 fd1
= get_unused_fd_flags(flags
);
1392 if (unlikely(fd1
< 0))
1395 fd2
= get_unused_fd_flags(flags
);
1396 if (unlikely(fd2
< 0)) {
1401 err
= put_user(fd1
, &usockvec
[0]);
1405 err
= put_user(fd2
, &usockvec
[1]);
1410 * Obtain the first socket and check if the underlying protocol
1411 * supports the socketpair call.
1414 err
= sock_create(family
, type
, protocol
, &sock1
);
1415 if (unlikely(err
< 0))
1418 err
= sock_create(family
, type
, protocol
, &sock2
);
1419 if (unlikely(err
< 0)) {
1420 sock_release(sock1
);
1424 err
= security_socket_socketpair(sock1
, sock2
);
1425 if (unlikely(err
)) {
1426 sock_release(sock2
);
1427 sock_release(sock1
);
1431 err
= sock1
->ops
->socketpair(sock1
, sock2
);
1432 if (unlikely(err
< 0)) {
1433 sock_release(sock2
);
1434 sock_release(sock1
);
1438 newfile1
= sock_alloc_file(sock1
, flags
, NULL
);
1439 if (IS_ERR(newfile1
)) {
1440 err
= PTR_ERR(newfile1
);
1441 sock_release(sock2
);
1445 newfile2
= sock_alloc_file(sock2
, flags
, NULL
);
1446 if (IS_ERR(newfile2
)) {
1447 err
= PTR_ERR(newfile2
);
1452 audit_fd_pair(fd1
, fd2
);
1454 fd_install(fd1
, newfile1
);
1455 fd_install(fd2
, newfile2
);
1464 SYSCALL_DEFINE4(socketpair
, int, family
, int, type
, int, protocol
,
1465 int __user
*, usockvec
)
1467 return __sys_socketpair(family
, type
, protocol
, usockvec
);
1471 * Bind a name to a socket. Nothing much to do here since it's
1472 * the protocol's responsibility to handle the local address.
1474 * We move the socket address to kernel space before we call
1475 * the protocol layer (having also checked the address is ok).
1478 int __sys_bind(int fd
, struct sockaddr __user
*umyaddr
, int addrlen
)
1480 struct socket
*sock
;
1481 struct sockaddr_storage address
;
1482 int err
, fput_needed
;
1484 sock
= sockfd_lookup_light(fd
, &err
, &fput_needed
);
1486 err
= move_addr_to_kernel(umyaddr
, addrlen
, &address
);
1488 err
= security_socket_bind(sock
,
1489 (struct sockaddr
*)&address
,
1492 err
= sock
->ops
->bind(sock
,
1496 fput_light(sock
->file
, fput_needed
);
1501 SYSCALL_DEFINE3(bind
, int, fd
, struct sockaddr __user
*, umyaddr
, int, addrlen
)
1503 return __sys_bind(fd
, umyaddr
, addrlen
);
1507 * Perform a listen. Basically, we allow the protocol to do anything
1508 * necessary for a listen, and if that works, we mark the socket as
1509 * ready for listening.
1512 int __sys_listen(int fd
, int backlog
)
1514 struct socket
*sock
;
1515 int err
, fput_needed
;
1518 sock
= sockfd_lookup_light(fd
, &err
, &fput_needed
);
1520 somaxconn
= sock_net(sock
->sk
)->core
.sysctl_somaxconn
;
1521 if ((unsigned int)backlog
> somaxconn
)
1522 backlog
= somaxconn
;
1524 err
= security_socket_listen(sock
, backlog
);
1526 err
= sock
->ops
->listen(sock
, backlog
);
1528 fput_light(sock
->file
, fput_needed
);
1533 SYSCALL_DEFINE2(listen
, int, fd
, int, backlog
)
1535 return __sys_listen(fd
, backlog
);
1539 * For accept, we attempt to create a new socket, set up the link
1540 * with the client, wake up the client, then return the new
1541 * connected fd. We collect the address of the connector in kernel
1542 * space and move it to user at the very end. This is unclean because
1543 * we open the socket then return an error.
1545 * 1003.1g adds the ability to recvmsg() to query connection pending
1546 * status to recvmsg. We need to add that support in a way thats
1547 * clean when we restructure accept also.
1550 int __sys_accept4(int fd
, struct sockaddr __user
*upeer_sockaddr
,
1551 int __user
*upeer_addrlen
, int flags
)
1553 struct socket
*sock
, *newsock
;
1554 struct file
*newfile
;
1555 int err
, len
, newfd
, fput_needed
;
1556 struct sockaddr_storage address
;
1558 if (flags
& ~(SOCK_CLOEXEC
| SOCK_NONBLOCK
))
1561 if (SOCK_NONBLOCK
!= O_NONBLOCK
&& (flags
& SOCK_NONBLOCK
))
1562 flags
= (flags
& ~SOCK_NONBLOCK
) | O_NONBLOCK
;
1564 sock
= sockfd_lookup_light(fd
, &err
, &fput_needed
);
1569 newsock
= sock_alloc();
1573 newsock
->type
= sock
->type
;
1574 newsock
->ops
= sock
->ops
;
1577 * We don't need try_module_get here, as the listening socket (sock)
1578 * has the protocol module (sock->ops->owner) held.
1580 __module_get(newsock
->ops
->owner
);
1582 newfd
= get_unused_fd_flags(flags
);
1583 if (unlikely(newfd
< 0)) {
1585 sock_release(newsock
);
1588 newfile
= sock_alloc_file(newsock
, flags
, sock
->sk
->sk_prot_creator
->name
);
1589 if (IS_ERR(newfile
)) {
1590 err
= PTR_ERR(newfile
);
1591 put_unused_fd(newfd
);
1595 err
= security_socket_accept(sock
, newsock
);
1599 err
= sock
->ops
->accept(sock
, newsock
, sock
->file
->f_flags
, false);
1603 if (upeer_sockaddr
) {
1604 len
= newsock
->ops
->getname(newsock
,
1605 (struct sockaddr
*)&address
, 2);
1607 err
= -ECONNABORTED
;
1610 err
= move_addr_to_user(&address
,
1611 len
, upeer_sockaddr
, upeer_addrlen
);
1616 /* File flags are not inherited via accept() unlike another OSes. */
1618 fd_install(newfd
, newfile
);
1622 fput_light(sock
->file
, fput_needed
);
1627 put_unused_fd(newfd
);
1631 SYSCALL_DEFINE4(accept4
, int, fd
, struct sockaddr __user
*, upeer_sockaddr
,
1632 int __user
*, upeer_addrlen
, int, flags
)
1634 return __sys_accept4(fd
, upeer_sockaddr
, upeer_addrlen
, flags
);
1637 SYSCALL_DEFINE3(accept
, int, fd
, struct sockaddr __user
*, upeer_sockaddr
,
1638 int __user
*, upeer_addrlen
)
1640 return __sys_accept4(fd
, upeer_sockaddr
, upeer_addrlen
, 0);
1644 * Attempt to connect to a socket with the server address. The address
1645 * is in user space so we verify it is OK and move it to kernel space.
1647 * For 1003.1g we need to add clean support for a bind to AF_UNSPEC to
1650 * NOTE: 1003.1g draft 6.3 is broken with respect to AX.25/NetROM and
1651 * other SEQPACKET protocols that take time to connect() as it doesn't
1652 * include the -EINPROGRESS status for such sockets.
1655 int __sys_connect(int fd
, struct sockaddr __user
*uservaddr
, int addrlen
)
1657 struct socket
*sock
;
1658 struct sockaddr_storage address
;
1659 int err
, fput_needed
;
1661 sock
= sockfd_lookup_light(fd
, &err
, &fput_needed
);
1664 err
= move_addr_to_kernel(uservaddr
, addrlen
, &address
);
1669 security_socket_connect(sock
, (struct sockaddr
*)&address
, addrlen
);
1673 err
= sock
->ops
->connect(sock
, (struct sockaddr
*)&address
, addrlen
,
1674 sock
->file
->f_flags
);
1676 fput_light(sock
->file
, fput_needed
);
1681 SYSCALL_DEFINE3(connect
, int, fd
, struct sockaddr __user
*, uservaddr
,
1684 return __sys_connect(fd
, uservaddr
, addrlen
);
1688 * Get the local address ('name') of a socket object. Move the obtained
1689 * name to user space.
1692 int __sys_getsockname(int fd
, struct sockaddr __user
*usockaddr
,
1693 int __user
*usockaddr_len
)
1695 struct socket
*sock
;
1696 struct sockaddr_storage address
;
1697 int err
, fput_needed
;
1699 sock
= sockfd_lookup_light(fd
, &err
, &fput_needed
);
1703 err
= security_socket_getsockname(sock
);
1707 err
= sock
->ops
->getname(sock
, (struct sockaddr
*)&address
, 0);
1710 /* "err" is actually length in this case */
1711 err
= move_addr_to_user(&address
, err
, usockaddr
, usockaddr_len
);
1714 fput_light(sock
->file
, fput_needed
);
1719 SYSCALL_DEFINE3(getsockname
, int, fd
, struct sockaddr __user
*, usockaddr
,
1720 int __user
*, usockaddr_len
)
1722 return __sys_getsockname(fd
, usockaddr
, usockaddr_len
);
1726 * Get the remote address ('name') of a socket object. Move the obtained
1727 * name to user space.
1730 int __sys_getpeername(int fd
, struct sockaddr __user
*usockaddr
,
1731 int __user
*usockaddr_len
)
1733 struct socket
*sock
;
1734 struct sockaddr_storage address
;
1735 int err
, fput_needed
;
1737 sock
= sockfd_lookup_light(fd
, &err
, &fput_needed
);
1739 err
= security_socket_getpeername(sock
);
1741 fput_light(sock
->file
, fput_needed
);
1745 err
= sock
->ops
->getname(sock
, (struct sockaddr
*)&address
, 1);
1747 /* "err" is actually length in this case */
1748 err
= move_addr_to_user(&address
, err
, usockaddr
,
1750 fput_light(sock
->file
, fput_needed
);
1755 SYSCALL_DEFINE3(getpeername
, int, fd
, struct sockaddr __user
*, usockaddr
,
1756 int __user
*, usockaddr_len
)
1758 return __sys_getpeername(fd
, usockaddr
, usockaddr_len
);
1762 * Send a datagram to a given address. We move the address into kernel
1763 * space and check the user space data area is readable before invoking
1766 int __sys_sendto(int fd
, void __user
*buff
, size_t len
, unsigned int flags
,
1767 struct sockaddr __user
*addr
, int addr_len
)
1769 struct socket
*sock
;
1770 struct sockaddr_storage address
;
1776 err
= import_single_range(WRITE
, buff
, len
, &iov
, &msg
.msg_iter
);
1779 sock
= sockfd_lookup_light(fd
, &err
, &fput_needed
);
1783 msg
.msg_name
= NULL
;
1784 msg
.msg_control
= NULL
;
1785 msg
.msg_controllen
= 0;
1786 msg
.msg_namelen
= 0;
1788 err
= move_addr_to_kernel(addr
, addr_len
, &address
);
1791 msg
.msg_name
= (struct sockaddr
*)&address
;
1792 msg
.msg_namelen
= addr_len
;
1794 if (sock
->file
->f_flags
& O_NONBLOCK
)
1795 flags
|= MSG_DONTWAIT
;
1796 msg
.msg_flags
= flags
;
1797 err
= sock_sendmsg(sock
, &msg
);
1800 fput_light(sock
->file
, fput_needed
);
1805 SYSCALL_DEFINE6(sendto
, int, fd
, void __user
*, buff
, size_t, len
,
1806 unsigned int, flags
, struct sockaddr __user
*, addr
,
1809 return __sys_sendto(fd
, buff
, len
, flags
, addr
, addr_len
);
1813 * Send a datagram down a socket.
1816 SYSCALL_DEFINE4(send
, int, fd
, void __user
*, buff
, size_t, len
,
1817 unsigned int, flags
)
1819 return __sys_sendto(fd
, buff
, len
, flags
, NULL
, 0);
1823 * Receive a frame from the socket and optionally record the address of the
1824 * sender. We verify the buffers are writable and if needed move the
1825 * sender address from kernel to user space.
1827 int __sys_recvfrom(int fd
, void __user
*ubuf
, size_t size
, unsigned int flags
,
1828 struct sockaddr __user
*addr
, int __user
*addr_len
)
1830 struct socket
*sock
;
1833 struct sockaddr_storage address
;
1837 err
= import_single_range(READ
, ubuf
, size
, &iov
, &msg
.msg_iter
);
1840 sock
= sockfd_lookup_light(fd
, &err
, &fput_needed
);
1844 msg
.msg_control
= NULL
;
1845 msg
.msg_controllen
= 0;
1846 /* Save some cycles and don't copy the address if not needed */
1847 msg
.msg_name
= addr
? (struct sockaddr
*)&address
: NULL
;
1848 /* We assume all kernel code knows the size of sockaddr_storage */
1849 msg
.msg_namelen
= 0;
1850 msg
.msg_iocb
= NULL
;
1852 if (sock
->file
->f_flags
& O_NONBLOCK
)
1853 flags
|= MSG_DONTWAIT
;
1854 err
= sock_recvmsg(sock
, &msg
, flags
);
1856 if (err
>= 0 && addr
!= NULL
) {
1857 err2
= move_addr_to_user(&address
,
1858 msg
.msg_namelen
, addr
, addr_len
);
1863 fput_light(sock
->file
, fput_needed
);
1868 SYSCALL_DEFINE6(recvfrom
, int, fd
, void __user
*, ubuf
, size_t, size
,
1869 unsigned int, flags
, struct sockaddr __user
*, addr
,
1870 int __user
*, addr_len
)
1872 return __sys_recvfrom(fd
, ubuf
, size
, flags
, addr
, addr_len
);
1876 * Receive a datagram from a socket.
1879 SYSCALL_DEFINE4(recv
, int, fd
, void __user
*, ubuf
, size_t, size
,
1880 unsigned int, flags
)
1882 return __sys_recvfrom(fd
, ubuf
, size
, flags
, NULL
, NULL
);
1886 * Set a socket option. Because we don't know the option lengths we have
1887 * to pass the user mode parameter for the protocols to sort out.
1890 static int __sys_setsockopt(int fd
, int level
, int optname
,
1891 char __user
*optval
, int optlen
)
1893 int err
, fput_needed
;
1894 struct socket
*sock
;
1899 sock
= sockfd_lookup_light(fd
, &err
, &fput_needed
);
1901 err
= security_socket_setsockopt(sock
, level
, optname
);
1905 if (level
== SOL_SOCKET
)
1907 sock_setsockopt(sock
, level
, optname
, optval
,
1911 sock
->ops
->setsockopt(sock
, level
, optname
, optval
,
1914 fput_light(sock
->file
, fput_needed
);
1919 SYSCALL_DEFINE5(setsockopt
, int, fd
, int, level
, int, optname
,
1920 char __user
*, optval
, int, optlen
)
1922 return __sys_setsockopt(fd
, level
, optname
, optval
, optlen
);
1926 * Get a socket option. Because we don't know the option lengths we have
1927 * to pass a user mode parameter for the protocols to sort out.
1930 static int __sys_getsockopt(int fd
, int level
, int optname
,
1931 char __user
*optval
, int __user
*optlen
)
1933 int err
, fput_needed
;
1934 struct socket
*sock
;
1936 sock
= sockfd_lookup_light(fd
, &err
, &fput_needed
);
1938 err
= security_socket_getsockopt(sock
, level
, optname
);
1942 if (level
== SOL_SOCKET
)
1944 sock_getsockopt(sock
, level
, optname
, optval
,
1948 sock
->ops
->getsockopt(sock
, level
, optname
, optval
,
1951 fput_light(sock
->file
, fput_needed
);
1956 SYSCALL_DEFINE5(getsockopt
, int, fd
, int, level
, int, optname
,
1957 char __user
*, optval
, int __user
*, optlen
)
1959 return __sys_getsockopt(fd
, level
, optname
, optval
, optlen
);
1963 * Shutdown a socket.
1966 int __sys_shutdown(int fd
, int how
)
1968 int err
, fput_needed
;
1969 struct socket
*sock
;
1971 sock
= sockfd_lookup_light(fd
, &err
, &fput_needed
);
1973 err
= security_socket_shutdown(sock
, how
);
1975 err
= sock
->ops
->shutdown(sock
, how
);
1976 fput_light(sock
->file
, fput_needed
);
1981 SYSCALL_DEFINE2(shutdown
, int, fd
, int, how
)
1983 return __sys_shutdown(fd
, how
);
1986 /* A couple of helpful macros for getting the address of the 32/64 bit
1987 * fields which are the same type (int / unsigned) on our platforms.
1989 #define COMPAT_MSG(msg, member) ((MSG_CMSG_COMPAT & flags) ? &msg##_compat->member : &msg->member)
1990 #define COMPAT_NAMELEN(msg) COMPAT_MSG(msg, msg_namelen)
1991 #define COMPAT_FLAGS(msg) COMPAT_MSG(msg, msg_flags)
1993 struct used_address
{
1994 struct sockaddr_storage name
;
1995 unsigned int name_len
;
1998 static int copy_msghdr_from_user(struct msghdr
*kmsg
,
1999 struct user_msghdr __user
*umsg
,
2000 struct sockaddr __user
**save_addr
,
2003 struct user_msghdr msg
;
2006 if (copy_from_user(&msg
, umsg
, sizeof(*umsg
)))
2009 kmsg
->msg_control
= (void __force
*)msg
.msg_control
;
2010 kmsg
->msg_controllen
= msg
.msg_controllen
;
2011 kmsg
->msg_flags
= msg
.msg_flags
;
2013 kmsg
->msg_namelen
= msg
.msg_namelen
;
2015 kmsg
->msg_namelen
= 0;
2017 if (kmsg
->msg_namelen
< 0)
2020 if (kmsg
->msg_namelen
> sizeof(struct sockaddr_storage
))
2021 kmsg
->msg_namelen
= sizeof(struct sockaddr_storage
);
2024 *save_addr
= msg
.msg_name
;
2026 if (msg
.msg_name
&& kmsg
->msg_namelen
) {
2028 err
= move_addr_to_kernel(msg
.msg_name
,
2035 kmsg
->msg_name
= NULL
;
2036 kmsg
->msg_namelen
= 0;
2039 if (msg
.msg_iovlen
> UIO_MAXIOV
)
2042 kmsg
->msg_iocb
= NULL
;
2044 return import_iovec(save_addr
? READ
: WRITE
,
2045 msg
.msg_iov
, msg
.msg_iovlen
,
2046 UIO_FASTIOV
, iov
, &kmsg
->msg_iter
);
2049 static int ___sys_sendmsg(struct socket
*sock
, struct user_msghdr __user
*msg
,
2050 struct msghdr
*msg_sys
, unsigned int flags
,
2051 struct used_address
*used_address
,
2052 unsigned int allowed_msghdr_flags
)
2054 struct compat_msghdr __user
*msg_compat
=
2055 (struct compat_msghdr __user
*)msg
;
2056 struct sockaddr_storage address
;
2057 struct iovec iovstack
[UIO_FASTIOV
], *iov
= iovstack
;
2058 unsigned char ctl
[sizeof(struct cmsghdr
) + 20]
2059 __aligned(sizeof(__kernel_size_t
));
2060 /* 20 is size of ipv6_pktinfo */
2061 unsigned char *ctl_buf
= ctl
;
2065 msg_sys
->msg_name
= &address
;
2067 if (MSG_CMSG_COMPAT
& flags
)
2068 err
= get_compat_msghdr(msg_sys
, msg_compat
, NULL
, &iov
);
2070 err
= copy_msghdr_from_user(msg_sys
, msg
, NULL
, &iov
);
2076 if (msg_sys
->msg_controllen
> INT_MAX
)
2078 flags
|= (msg_sys
->msg_flags
& allowed_msghdr_flags
);
2079 ctl_len
= msg_sys
->msg_controllen
;
2080 if ((MSG_CMSG_COMPAT
& flags
) && ctl_len
) {
2082 cmsghdr_from_user_compat_to_kern(msg_sys
, sock
->sk
, ctl
,
2086 ctl_buf
= msg_sys
->msg_control
;
2087 ctl_len
= msg_sys
->msg_controllen
;
2088 } else if (ctl_len
) {
2089 BUILD_BUG_ON(sizeof(struct cmsghdr
) !=
2090 CMSG_ALIGN(sizeof(struct cmsghdr
)));
2091 if (ctl_len
> sizeof(ctl
)) {
2092 ctl_buf
= sock_kmalloc(sock
->sk
, ctl_len
, GFP_KERNEL
);
2093 if (ctl_buf
== NULL
)
2098 * Careful! Before this, msg_sys->msg_control contains a user pointer.
2099 * Afterwards, it will be a kernel pointer. Thus the compiler-assisted
2100 * checking falls down on this.
2102 if (copy_from_user(ctl_buf
,
2103 (void __user __force
*)msg_sys
->msg_control
,
2106 msg_sys
->msg_control
= ctl_buf
;
2108 msg_sys
->msg_flags
= flags
;
2110 if (sock
->file
->f_flags
& O_NONBLOCK
)
2111 msg_sys
->msg_flags
|= MSG_DONTWAIT
;
2113 * If this is sendmmsg() and current destination address is same as
2114 * previously succeeded address, omit asking LSM's decision.
2115 * used_address->name_len is initialized to UINT_MAX so that the first
2116 * destination address never matches.
2118 if (used_address
&& msg_sys
->msg_name
&&
2119 used_address
->name_len
== msg_sys
->msg_namelen
&&
2120 !memcmp(&used_address
->name
, msg_sys
->msg_name
,
2121 used_address
->name_len
)) {
2122 err
= sock_sendmsg_nosec(sock
, msg_sys
);
2125 err
= sock_sendmsg(sock
, msg_sys
);
2127 * If this is sendmmsg() and sending to current destination address was
2128 * successful, remember it.
2130 if (used_address
&& err
>= 0) {
2131 used_address
->name_len
= msg_sys
->msg_namelen
;
2132 if (msg_sys
->msg_name
)
2133 memcpy(&used_address
->name
, msg_sys
->msg_name
,
2134 used_address
->name_len
);
2139 sock_kfree_s(sock
->sk
, ctl_buf
, ctl_len
);
2146 * BSD sendmsg interface
2149 long __sys_sendmsg(int fd
, struct user_msghdr __user
*msg
, unsigned int flags
,
2150 bool forbid_cmsg_compat
)
2152 int fput_needed
, err
;
2153 struct msghdr msg_sys
;
2154 struct socket
*sock
;
2156 if (forbid_cmsg_compat
&& (flags
& MSG_CMSG_COMPAT
))
2159 sock
= sockfd_lookup_light(fd
, &err
, &fput_needed
);
2163 err
= ___sys_sendmsg(sock
, msg
, &msg_sys
, flags
, NULL
, 0);
2165 fput_light(sock
->file
, fput_needed
);
2170 SYSCALL_DEFINE3(sendmsg
, int, fd
, struct user_msghdr __user
*, msg
, unsigned int, flags
)
2172 return __sys_sendmsg(fd
, msg
, flags
, true);
2176 * Linux sendmmsg interface
2179 int __sys_sendmmsg(int fd
, struct mmsghdr __user
*mmsg
, unsigned int vlen
,
2180 unsigned int flags
, bool forbid_cmsg_compat
)
2182 int fput_needed
, err
, datagrams
;
2183 struct socket
*sock
;
2184 struct mmsghdr __user
*entry
;
2185 struct compat_mmsghdr __user
*compat_entry
;
2186 struct msghdr msg_sys
;
2187 struct used_address used_address
;
2188 unsigned int oflags
= flags
;
2190 if (forbid_cmsg_compat
&& (flags
& MSG_CMSG_COMPAT
))
2193 if (vlen
> UIO_MAXIOV
)
2198 sock
= sockfd_lookup_light(fd
, &err
, &fput_needed
);
2202 used_address
.name_len
= UINT_MAX
;
2204 compat_entry
= (struct compat_mmsghdr __user
*)mmsg
;
2208 while (datagrams
< vlen
) {
2209 if (datagrams
== vlen
- 1)
2212 if (MSG_CMSG_COMPAT
& flags
) {
2213 err
= ___sys_sendmsg(sock
, (struct user_msghdr __user
*)compat_entry
,
2214 &msg_sys
, flags
, &used_address
, MSG_EOR
);
2217 err
= __put_user(err
, &compat_entry
->msg_len
);
2220 err
= ___sys_sendmsg(sock
,
2221 (struct user_msghdr __user
*)entry
,
2222 &msg_sys
, flags
, &used_address
, MSG_EOR
);
2225 err
= put_user(err
, &entry
->msg_len
);
2232 if (msg_data_left(&msg_sys
))
2237 fput_light(sock
->file
, fput_needed
);
2239 /* We only return an error if no datagrams were able to be sent */
2246 SYSCALL_DEFINE4(sendmmsg
, int, fd
, struct mmsghdr __user
*, mmsg
,
2247 unsigned int, vlen
, unsigned int, flags
)
2249 return __sys_sendmmsg(fd
, mmsg
, vlen
, flags
, true);
2252 static int ___sys_recvmsg(struct socket
*sock
, struct user_msghdr __user
*msg
,
2253 struct msghdr
*msg_sys
, unsigned int flags
, int nosec
)
2255 struct compat_msghdr __user
*msg_compat
=
2256 (struct compat_msghdr __user
*)msg
;
2257 struct iovec iovstack
[UIO_FASTIOV
];
2258 struct iovec
*iov
= iovstack
;
2259 unsigned long cmsg_ptr
;
2263 /* kernel mode address */
2264 struct sockaddr_storage addr
;
2266 /* user mode address pointers */
2267 struct sockaddr __user
*uaddr
;
2268 int __user
*uaddr_len
= COMPAT_NAMELEN(msg
);
2270 msg_sys
->msg_name
= &addr
;
2272 if (MSG_CMSG_COMPAT
& flags
)
2273 err
= get_compat_msghdr(msg_sys
, msg_compat
, &uaddr
, &iov
);
2275 err
= copy_msghdr_from_user(msg_sys
, msg
, &uaddr
, &iov
);
2279 cmsg_ptr
= (unsigned long)msg_sys
->msg_control
;
2280 msg_sys
->msg_flags
= flags
& (MSG_CMSG_CLOEXEC
|MSG_CMSG_COMPAT
);
2282 /* We assume all kernel code knows the size of sockaddr_storage */
2283 msg_sys
->msg_namelen
= 0;
2285 if (sock
->file
->f_flags
& O_NONBLOCK
)
2286 flags
|= MSG_DONTWAIT
;
2287 err
= (nosec
? sock_recvmsg_nosec
: sock_recvmsg
)(sock
, msg_sys
, flags
);
2292 if (uaddr
!= NULL
) {
2293 err
= move_addr_to_user(&addr
,
2294 msg_sys
->msg_namelen
, uaddr
,
2299 err
= __put_user((msg_sys
->msg_flags
& ~MSG_CMSG_COMPAT
),
2303 if (MSG_CMSG_COMPAT
& flags
)
2304 err
= __put_user((unsigned long)msg_sys
->msg_control
- cmsg_ptr
,
2305 &msg_compat
->msg_controllen
);
2307 err
= __put_user((unsigned long)msg_sys
->msg_control
- cmsg_ptr
,
2308 &msg
->msg_controllen
);
2319 * BSD recvmsg interface
2322 long __sys_recvmsg(int fd
, struct user_msghdr __user
*msg
, unsigned int flags
,
2323 bool forbid_cmsg_compat
)
2325 int fput_needed
, err
;
2326 struct msghdr msg_sys
;
2327 struct socket
*sock
;
2329 if (forbid_cmsg_compat
&& (flags
& MSG_CMSG_COMPAT
))
2332 sock
= sockfd_lookup_light(fd
, &err
, &fput_needed
);
2336 err
= ___sys_recvmsg(sock
, msg
, &msg_sys
, flags
, 0);
2338 fput_light(sock
->file
, fput_needed
);
2343 SYSCALL_DEFINE3(recvmsg
, int, fd
, struct user_msghdr __user
*, msg
,
2344 unsigned int, flags
)
2346 return __sys_recvmsg(fd
, msg
, flags
, true);
2350 * Linux recvmmsg interface
2353 int __sys_recvmmsg(int fd
, struct mmsghdr __user
*mmsg
, unsigned int vlen
,
2354 unsigned int flags
, struct timespec
*timeout
)
2356 int fput_needed
, err
, datagrams
;
2357 struct socket
*sock
;
2358 struct mmsghdr __user
*entry
;
2359 struct compat_mmsghdr __user
*compat_entry
;
2360 struct msghdr msg_sys
;
2361 struct timespec64 end_time
;
2362 struct timespec64 timeout64
;
2365 poll_select_set_timeout(&end_time
, timeout
->tv_sec
,
2371 sock
= sockfd_lookup_light(fd
, &err
, &fput_needed
);
2375 if (likely(!(flags
& MSG_ERRQUEUE
))) {
2376 err
= sock_error(sock
->sk
);
2384 compat_entry
= (struct compat_mmsghdr __user
*)mmsg
;
2386 while (datagrams
< vlen
) {
2388 * No need to ask LSM for more than the first datagram.
2390 if (MSG_CMSG_COMPAT
& flags
) {
2391 err
= ___sys_recvmsg(sock
, (struct user_msghdr __user
*)compat_entry
,
2392 &msg_sys
, flags
& ~MSG_WAITFORONE
,
2396 err
= __put_user(err
, &compat_entry
->msg_len
);
2399 err
= ___sys_recvmsg(sock
,
2400 (struct user_msghdr __user
*)entry
,
2401 &msg_sys
, flags
& ~MSG_WAITFORONE
,
2405 err
= put_user(err
, &entry
->msg_len
);
2413 /* MSG_WAITFORONE turns on MSG_DONTWAIT after one packet */
2414 if (flags
& MSG_WAITFORONE
)
2415 flags
|= MSG_DONTWAIT
;
2418 ktime_get_ts64(&timeout64
);
2419 *timeout
= timespec64_to_timespec(
2420 timespec64_sub(end_time
, timeout64
));
2421 if (timeout
->tv_sec
< 0) {
2422 timeout
->tv_sec
= timeout
->tv_nsec
= 0;
2426 /* Timeout, return less than vlen datagrams */
2427 if (timeout
->tv_nsec
== 0 && timeout
->tv_sec
== 0)
2431 /* Out of band data, return right away */
2432 if (msg_sys
.msg_flags
& MSG_OOB
)
2440 if (datagrams
== 0) {
2446 * We may return less entries than requested (vlen) if the
2447 * sock is non block and there aren't enough datagrams...
2449 if (err
!= -EAGAIN
) {
2451 * ... or if recvmsg returns an error after we
2452 * received some datagrams, where we record the
2453 * error to return on the next call or if the
2454 * app asks about it using getsockopt(SO_ERROR).
2456 sock
->sk
->sk_err
= -err
;
2459 fput_light(sock
->file
, fput_needed
);
2464 static int do_sys_recvmmsg(int fd
, struct mmsghdr __user
*mmsg
,
2465 unsigned int vlen
, unsigned int flags
,
2466 struct timespec __user
*timeout
)
2469 struct timespec timeout_sys
;
2471 if (flags
& MSG_CMSG_COMPAT
)
2475 return __sys_recvmmsg(fd
, mmsg
, vlen
, flags
, NULL
);
2477 if (copy_from_user(&timeout_sys
, timeout
, sizeof(timeout_sys
)))
2480 datagrams
= __sys_recvmmsg(fd
, mmsg
, vlen
, flags
, &timeout_sys
);
2482 if (datagrams
> 0 &&
2483 copy_to_user(timeout
, &timeout_sys
, sizeof(timeout_sys
)))
2484 datagrams
= -EFAULT
;
2489 SYSCALL_DEFINE5(recvmmsg
, int, fd
, struct mmsghdr __user
*, mmsg
,
2490 unsigned int, vlen
, unsigned int, flags
,
2491 struct timespec __user
*, timeout
)
2493 return do_sys_recvmmsg(fd
, mmsg
, vlen
, flags
, timeout
);
2496 #ifdef __ARCH_WANT_SYS_SOCKETCALL
2497 /* Argument list sizes for sys_socketcall */
2498 #define AL(x) ((x) * sizeof(unsigned long))
2499 static const unsigned char nargs
[21] = {
2500 AL(0), AL(3), AL(3), AL(3), AL(2), AL(3),
2501 AL(3), AL(3), AL(4), AL(4), AL(4), AL(6),
2502 AL(6), AL(2), AL(5), AL(5), AL(3), AL(3),
2509 * System call vectors.
2511 * Argument checking cleaned up. Saved 20% in size.
2512 * This function doesn't need to set the kernel lock because
2513 * it is set by the callees.
2516 SYSCALL_DEFINE2(socketcall
, int, call
, unsigned long __user
*, args
)
2518 unsigned long a
[AUDITSC_ARGS
];
2519 unsigned long a0
, a1
;
2523 if (call
< 1 || call
> SYS_SENDMMSG
)
2527 if (len
> sizeof(a
))
2530 /* copy_from_user should be SMP safe. */
2531 if (copy_from_user(a
, args
, len
))
2534 err
= audit_socketcall(nargs
[call
] / sizeof(unsigned long), a
);
2543 err
= __sys_socket(a0
, a1
, a
[2]);
2546 err
= __sys_bind(a0
, (struct sockaddr __user
*)a1
, a
[2]);
2549 err
= __sys_connect(a0
, (struct sockaddr __user
*)a1
, a
[2]);
2552 err
= __sys_listen(a0
, a1
);
2555 err
= __sys_accept4(a0
, (struct sockaddr __user
*)a1
,
2556 (int __user
*)a
[2], 0);
2558 case SYS_GETSOCKNAME
:
2560 __sys_getsockname(a0
, (struct sockaddr __user
*)a1
,
2561 (int __user
*)a
[2]);
2563 case SYS_GETPEERNAME
:
2565 __sys_getpeername(a0
, (struct sockaddr __user
*)a1
,
2566 (int __user
*)a
[2]);
2568 case SYS_SOCKETPAIR
:
2569 err
= __sys_socketpair(a0
, a1
, a
[2], (int __user
*)a
[3]);
2572 err
= __sys_sendto(a0
, (void __user
*)a1
, a
[2], a
[3],
2576 err
= __sys_sendto(a0
, (void __user
*)a1
, a
[2], a
[3],
2577 (struct sockaddr __user
*)a
[4], a
[5]);
2580 err
= __sys_recvfrom(a0
, (void __user
*)a1
, a
[2], a
[3],
2584 err
= __sys_recvfrom(a0
, (void __user
*)a1
, a
[2], a
[3],
2585 (struct sockaddr __user
*)a
[4],
2586 (int __user
*)a
[5]);
2589 err
= __sys_shutdown(a0
, a1
);
2591 case SYS_SETSOCKOPT
:
2592 err
= __sys_setsockopt(a0
, a1
, a
[2], (char __user
*)a
[3],
2595 case SYS_GETSOCKOPT
:
2597 __sys_getsockopt(a0
, a1
, a
[2], (char __user
*)a
[3],
2598 (int __user
*)a
[4]);
2601 err
= __sys_sendmsg(a0
, (struct user_msghdr __user
*)a1
,
2605 err
= __sys_sendmmsg(a0
, (struct mmsghdr __user
*)a1
, a
[2],
2609 err
= __sys_recvmsg(a0
, (struct user_msghdr __user
*)a1
,
2613 err
= do_sys_recvmmsg(a0
, (struct mmsghdr __user
*)a1
, a
[2],
2614 a
[3], (struct timespec __user
*)a
[4]);
2617 err
= __sys_accept4(a0
, (struct sockaddr __user
*)a1
,
2618 (int __user
*)a
[2], a
[3]);
2627 #endif /* __ARCH_WANT_SYS_SOCKETCALL */
2630 * sock_register - add a socket protocol handler
2631 * @ops: description of protocol
2633 * This function is called by a protocol handler that wants to
2634 * advertise its address family, and have it linked into the
2635 * socket interface. The value ops->family corresponds to the
2636 * socket system call protocol family.
2638 int sock_register(const struct net_proto_family
*ops
)
2642 if (ops
->family
>= NPROTO
) {
2643 pr_crit("protocol %d >= NPROTO(%d)\n", ops
->family
, NPROTO
);
2647 spin_lock(&net_family_lock
);
2648 if (rcu_dereference_protected(net_families
[ops
->family
],
2649 lockdep_is_held(&net_family_lock
)))
2652 rcu_assign_pointer(net_families
[ops
->family
], ops
);
2655 spin_unlock(&net_family_lock
);
2657 pr_info("NET: Registered protocol family %d\n", ops
->family
);
2660 EXPORT_SYMBOL(sock_register
);
2663 * sock_unregister - remove a protocol handler
2664 * @family: protocol family to remove
2666 * This function is called by a protocol handler that wants to
2667 * remove its address family, and have it unlinked from the
2668 * new socket creation.
2670 * If protocol handler is a module, then it can use module reference
2671 * counts to protect against new references. If protocol handler is not
2672 * a module then it needs to provide its own protection in
2673 * the ops->create routine.
2675 void sock_unregister(int family
)
2677 BUG_ON(family
< 0 || family
>= NPROTO
);
2679 spin_lock(&net_family_lock
);
2680 RCU_INIT_POINTER(net_families
[family
], NULL
);
2681 spin_unlock(&net_family_lock
);
2685 pr_info("NET: Unregistered protocol family %d\n", family
);
2687 EXPORT_SYMBOL(sock_unregister
);
2689 bool sock_is_registered(int family
)
2691 return family
< NPROTO
&& rcu_access_pointer(net_families
[family
]);
2694 static int __init
sock_init(void)
2698 * Initialize the network sysctl infrastructure.
2700 err
= net_sysctl_init();
2705 * Initialize skbuff SLAB cache
2710 * Initialize the protocols module.
2715 err
= register_filesystem(&sock_fs_type
);
2718 sock_mnt
= kern_mount(&sock_fs_type
);
2719 if (IS_ERR(sock_mnt
)) {
2720 err
= PTR_ERR(sock_mnt
);
2724 /* The real protocol initialization is performed in later initcalls.
2727 #ifdef CONFIG_NETFILTER
2728 err
= netfilter_init();
2733 ptp_classifier_init();
2739 unregister_filesystem(&sock_fs_type
);
2744 core_initcall(sock_init
); /* early initcall */
2746 #ifdef CONFIG_PROC_FS
2747 void socket_seq_show(struct seq_file
*seq
)
2749 seq_printf(seq
, "sockets: used %d\n",
2750 sock_inuse_get(seq
->private));
2752 #endif /* CONFIG_PROC_FS */
2754 #ifdef CONFIG_COMPAT
2755 static int do_siocgstamp(struct net
*net
, struct socket
*sock
,
2756 unsigned int cmd
, void __user
*up
)
2758 mm_segment_t old_fs
= get_fs();
2763 err
= sock_do_ioctl(net
, sock
, cmd
, (unsigned long)&ktv
);
2766 err
= compat_put_timeval(&ktv
, up
);
2771 static int do_siocgstampns(struct net
*net
, struct socket
*sock
,
2772 unsigned int cmd
, void __user
*up
)
2774 mm_segment_t old_fs
= get_fs();
2775 struct timespec kts
;
2779 err
= sock_do_ioctl(net
, sock
, cmd
, (unsigned long)&kts
);
2782 err
= compat_put_timespec(&kts
, up
);
2787 static int compat_dev_ifconf(struct net
*net
, struct compat_ifconf __user
*uifc32
)
2789 struct compat_ifconf ifc32
;
2793 if (copy_from_user(&ifc32
, uifc32
, sizeof(struct compat_ifconf
)))
2796 ifc
.ifc_len
= ifc32
.ifc_len
;
2797 ifc
.ifc_req
= compat_ptr(ifc32
.ifcbuf
);
2800 err
= dev_ifconf(net
, &ifc
, sizeof(struct compat_ifreq
));
2805 ifc32
.ifc_len
= ifc
.ifc_len
;
2806 if (copy_to_user(uifc32
, &ifc32
, sizeof(struct compat_ifconf
)))
2812 static int ethtool_ioctl(struct net
*net
, struct compat_ifreq __user
*ifr32
)
2814 struct compat_ethtool_rxnfc __user
*compat_rxnfc
;
2815 bool convert_in
= false, convert_out
= false;
2816 size_t buf_size
= 0;
2817 struct ethtool_rxnfc __user
*rxnfc
= NULL
;
2819 u32 rule_cnt
= 0, actual_rule_cnt
;
2824 if (get_user(data
, &ifr32
->ifr_ifru
.ifru_data
))
2827 compat_rxnfc
= compat_ptr(data
);
2829 if (get_user(ethcmd
, &compat_rxnfc
->cmd
))
2832 /* Most ethtool structures are defined without padding.
2833 * Unfortunately struct ethtool_rxnfc is an exception.
2838 case ETHTOOL_GRXCLSRLALL
:
2839 /* Buffer size is variable */
2840 if (get_user(rule_cnt
, &compat_rxnfc
->rule_cnt
))
2842 if (rule_cnt
> KMALLOC_MAX_SIZE
/ sizeof(u32
))
2844 buf_size
+= rule_cnt
* sizeof(u32
);
2846 case ETHTOOL_GRXRINGS
:
2847 case ETHTOOL_GRXCLSRLCNT
:
2848 case ETHTOOL_GRXCLSRULE
:
2849 case ETHTOOL_SRXCLSRLINS
:
2852 case ETHTOOL_SRXCLSRLDEL
:
2853 buf_size
+= sizeof(struct ethtool_rxnfc
);
2855 rxnfc
= compat_alloc_user_space(buf_size
);
2859 if (copy_from_user(&ifr
.ifr_name
, &ifr32
->ifr_name
, IFNAMSIZ
))
2862 ifr
.ifr_data
= convert_in
? rxnfc
: (void __user
*)compat_rxnfc
;
2865 /* We expect there to be holes between fs.m_ext and
2866 * fs.ring_cookie and at the end of fs, but nowhere else.
2868 BUILD_BUG_ON(offsetof(struct compat_ethtool_rxnfc
, fs
.m_ext
) +
2869 sizeof(compat_rxnfc
->fs
.m_ext
) !=
2870 offsetof(struct ethtool_rxnfc
, fs
.m_ext
) +
2871 sizeof(rxnfc
->fs
.m_ext
));
2873 offsetof(struct compat_ethtool_rxnfc
, fs
.location
) -
2874 offsetof(struct compat_ethtool_rxnfc
, fs
.ring_cookie
) !=
2875 offsetof(struct ethtool_rxnfc
, fs
.location
) -
2876 offsetof(struct ethtool_rxnfc
, fs
.ring_cookie
));
2878 if (copy_in_user(rxnfc
, compat_rxnfc
,
2879 (void __user
*)(&rxnfc
->fs
.m_ext
+ 1) -
2880 (void __user
*)rxnfc
) ||
2881 copy_in_user(&rxnfc
->fs
.ring_cookie
,
2882 &compat_rxnfc
->fs
.ring_cookie
,
2883 (void __user
*)(&rxnfc
->fs
.location
+ 1) -
2884 (void __user
*)&rxnfc
->fs
.ring_cookie
) ||
2885 copy_in_user(&rxnfc
->rule_cnt
, &compat_rxnfc
->rule_cnt
,
2886 sizeof(rxnfc
->rule_cnt
)))
2890 ret
= dev_ioctl(net
, SIOCETHTOOL
, &ifr
, NULL
);
2895 if (copy_in_user(compat_rxnfc
, rxnfc
,
2896 (const void __user
*)(&rxnfc
->fs
.m_ext
+ 1) -
2897 (const void __user
*)rxnfc
) ||
2898 copy_in_user(&compat_rxnfc
->fs
.ring_cookie
,
2899 &rxnfc
->fs
.ring_cookie
,
2900 (const void __user
*)(&rxnfc
->fs
.location
+ 1) -
2901 (const void __user
*)&rxnfc
->fs
.ring_cookie
) ||
2902 copy_in_user(&compat_rxnfc
->rule_cnt
, &rxnfc
->rule_cnt
,
2903 sizeof(rxnfc
->rule_cnt
)))
2906 if (ethcmd
== ETHTOOL_GRXCLSRLALL
) {
2907 /* As an optimisation, we only copy the actual
2908 * number of rules that the underlying
2909 * function returned. Since Mallory might
2910 * change the rule count in user memory, we
2911 * check that it is less than the rule count
2912 * originally given (as the user buffer size),
2913 * which has been range-checked.
2915 if (get_user(actual_rule_cnt
, &rxnfc
->rule_cnt
))
2917 if (actual_rule_cnt
< rule_cnt
)
2918 rule_cnt
= actual_rule_cnt
;
2919 if (copy_in_user(&compat_rxnfc
->rule_locs
[0],
2920 &rxnfc
->rule_locs
[0],
2921 rule_cnt
* sizeof(u32
)))
2929 static int compat_siocwandev(struct net
*net
, struct compat_ifreq __user
*uifr32
)
2931 compat_uptr_t uptr32
;
2936 if (copy_from_user(&ifr
, uifr32
, sizeof(struct compat_ifreq
)))
2939 if (get_user(uptr32
, &uifr32
->ifr_settings
.ifs_ifsu
))
2942 saved
= ifr
.ifr_settings
.ifs_ifsu
.raw_hdlc
;
2943 ifr
.ifr_settings
.ifs_ifsu
.raw_hdlc
= compat_ptr(uptr32
);
2945 err
= dev_ioctl(net
, SIOCWANDEV
, &ifr
, NULL
);
2947 ifr
.ifr_settings
.ifs_ifsu
.raw_hdlc
= saved
;
2948 if (copy_to_user(uifr32
, &ifr
, sizeof(struct compat_ifreq
)))
2954 /* Handle ioctls that use ifreq::ifr_data and just need struct ifreq converted */
2955 static int compat_ifr_data_ioctl(struct net
*net
, unsigned int cmd
,
2956 struct compat_ifreq __user
*u_ifreq32
)
2961 if (copy_from_user(ifreq
.ifr_name
, u_ifreq32
->ifr_name
, IFNAMSIZ
))
2963 if (get_user(data32
, &u_ifreq32
->ifr_data
))
2965 ifreq
.ifr_data
= compat_ptr(data32
);
2967 return dev_ioctl(net
, cmd
, &ifreq
, NULL
);
2970 static int compat_sioc_ifmap(struct net
*net
, unsigned int cmd
,
2971 struct compat_ifreq __user
*uifr32
)
2974 struct compat_ifmap __user
*uifmap32
;
2977 uifmap32
= &uifr32
->ifr_ifru
.ifru_map
;
2978 err
= copy_from_user(&ifr
, uifr32
, sizeof(ifr
.ifr_name
));
2979 err
|= get_user(ifr
.ifr_map
.mem_start
, &uifmap32
->mem_start
);
2980 err
|= get_user(ifr
.ifr_map
.mem_end
, &uifmap32
->mem_end
);
2981 err
|= get_user(ifr
.ifr_map
.base_addr
, &uifmap32
->base_addr
);
2982 err
|= get_user(ifr
.ifr_map
.irq
, &uifmap32
->irq
);
2983 err
|= get_user(ifr
.ifr_map
.dma
, &uifmap32
->dma
);
2984 err
|= get_user(ifr
.ifr_map
.port
, &uifmap32
->port
);
2988 err
= dev_ioctl(net
, cmd
, &ifr
, NULL
);
2990 if (cmd
== SIOCGIFMAP
&& !err
) {
2991 err
= copy_to_user(uifr32
, &ifr
, sizeof(ifr
.ifr_name
));
2992 err
|= put_user(ifr
.ifr_map
.mem_start
, &uifmap32
->mem_start
);
2993 err
|= put_user(ifr
.ifr_map
.mem_end
, &uifmap32
->mem_end
);
2994 err
|= put_user(ifr
.ifr_map
.base_addr
, &uifmap32
->base_addr
);
2995 err
|= put_user(ifr
.ifr_map
.irq
, &uifmap32
->irq
);
2996 err
|= put_user(ifr
.ifr_map
.dma
, &uifmap32
->dma
);
2997 err
|= put_user(ifr
.ifr_map
.port
, &uifmap32
->port
);
3006 struct sockaddr rt_dst
; /* target address */
3007 struct sockaddr rt_gateway
; /* gateway addr (RTF_GATEWAY) */
3008 struct sockaddr rt_genmask
; /* target network mask (IP) */
3009 unsigned short rt_flags
;
3012 unsigned char rt_tos
;
3013 unsigned char rt_class
;
3015 short rt_metric
; /* +1 for binary compatibility! */
3016 /* char * */ u32 rt_dev
; /* forcing the device at add */
3017 u32 rt_mtu
; /* per route MTU/Window */
3018 u32 rt_window
; /* Window clamping */
3019 unsigned short rt_irtt
; /* Initial RTT */
3022 struct in6_rtmsg32
{
3023 struct in6_addr rtmsg_dst
;
3024 struct in6_addr rtmsg_src
;
3025 struct in6_addr rtmsg_gateway
;
3035 static int routing_ioctl(struct net
*net
, struct socket
*sock
,
3036 unsigned int cmd
, void __user
*argp
)
3040 struct in6_rtmsg r6
;
3044 mm_segment_t old_fs
= get_fs();
3046 if (sock
&& sock
->sk
&& sock
->sk
->sk_family
== AF_INET6
) { /* ipv6 */
3047 struct in6_rtmsg32 __user
*ur6
= argp
;
3048 ret
= copy_from_user(&r6
.rtmsg_dst
, &(ur6
->rtmsg_dst
),
3049 3 * sizeof(struct in6_addr
));
3050 ret
|= get_user(r6
.rtmsg_type
, &(ur6
->rtmsg_type
));
3051 ret
|= get_user(r6
.rtmsg_dst_len
, &(ur6
->rtmsg_dst_len
));
3052 ret
|= get_user(r6
.rtmsg_src_len
, &(ur6
->rtmsg_src_len
));
3053 ret
|= get_user(r6
.rtmsg_metric
, &(ur6
->rtmsg_metric
));
3054 ret
|= get_user(r6
.rtmsg_info
, &(ur6
->rtmsg_info
));
3055 ret
|= get_user(r6
.rtmsg_flags
, &(ur6
->rtmsg_flags
));
3056 ret
|= get_user(r6
.rtmsg_ifindex
, &(ur6
->rtmsg_ifindex
));
3060 struct rtentry32 __user
*ur4
= argp
;
3061 ret
= copy_from_user(&r4
.rt_dst
, &(ur4
->rt_dst
),
3062 3 * sizeof(struct sockaddr
));
3063 ret
|= get_user(r4
.rt_flags
, &(ur4
->rt_flags
));
3064 ret
|= get_user(r4
.rt_metric
, &(ur4
->rt_metric
));
3065 ret
|= get_user(r4
.rt_mtu
, &(ur4
->rt_mtu
));
3066 ret
|= get_user(r4
.rt_window
, &(ur4
->rt_window
));
3067 ret
|= get_user(r4
.rt_irtt
, &(ur4
->rt_irtt
));
3068 ret
|= get_user(rtdev
, &(ur4
->rt_dev
));
3070 ret
|= copy_from_user(devname
, compat_ptr(rtdev
), 15);
3071 r4
.rt_dev
= (char __user __force
*)devname
;
3085 ret
= sock_do_ioctl(net
, sock
, cmd
, (unsigned long) r
);
3092 /* Since old style bridge ioctl's endup using SIOCDEVPRIVATE
3093 * for some operations; this forces use of the newer bridge-utils that
3094 * use compatible ioctls
3096 static int old_bridge_ioctl(compat_ulong_t __user
*argp
)
3100 if (get_user(tmp
, argp
))
3102 if (tmp
== BRCTL_GET_VERSION
)
3103 return BRCTL_VERSION
+ 1;
3107 static int compat_sock_ioctl_trans(struct file
*file
, struct socket
*sock
,
3108 unsigned int cmd
, unsigned long arg
)
3110 void __user
*argp
= compat_ptr(arg
);
3111 struct sock
*sk
= sock
->sk
;
3112 struct net
*net
= sock_net(sk
);
3114 if (cmd
>= SIOCDEVPRIVATE
&& cmd
<= (SIOCDEVPRIVATE
+ 15))
3115 return compat_ifr_data_ioctl(net
, cmd
, argp
);
3120 return old_bridge_ioctl(argp
);
3122 return compat_dev_ifconf(net
, argp
);
3124 return ethtool_ioctl(net
, argp
);
3126 return compat_siocwandev(net
, argp
);
3129 return compat_sioc_ifmap(net
, cmd
, argp
);
3132 return routing_ioctl(net
, sock
, cmd
, argp
);
3134 return do_siocgstamp(net
, sock
, cmd
, argp
);
3136 return do_siocgstampns(net
, sock
, cmd
, argp
);
3137 case SIOCBONDSLAVEINFOQUERY
:
3138 case SIOCBONDINFOQUERY
:
3141 return compat_ifr_data_ioctl(net
, cmd
, argp
);
3154 return sock_ioctl(file
, cmd
, arg
);
3171 case SIOCSIFHWBROADCAST
:
3173 case SIOCGIFBRDADDR
:
3174 case SIOCSIFBRDADDR
:
3175 case SIOCGIFDSTADDR
:
3176 case SIOCSIFDSTADDR
:
3177 case SIOCGIFNETMASK
:
3178 case SIOCSIFNETMASK
:
3193 case SIOCBONDENSLAVE
:
3194 case SIOCBONDRELEASE
:
3195 case SIOCBONDSETHWADDR
:
3196 case SIOCBONDCHANGEACTIVE
:
3198 return sock_do_ioctl(net
, sock
, cmd
, arg
);
3201 return -ENOIOCTLCMD
;
3204 static long compat_sock_ioctl(struct file
*file
, unsigned int cmd
,
3207 struct socket
*sock
= file
->private_data
;
3208 int ret
= -ENOIOCTLCMD
;
3215 if (sock
->ops
->compat_ioctl
)
3216 ret
= sock
->ops
->compat_ioctl(sock
, cmd
, arg
);
3218 if (ret
== -ENOIOCTLCMD
&&
3219 (cmd
>= SIOCIWFIRST
&& cmd
<= SIOCIWLAST
))
3220 ret
= compat_wext_handle_ioctl(net
, cmd
, arg
);
3222 if (ret
== -ENOIOCTLCMD
)
3223 ret
= compat_sock_ioctl_trans(file
, sock
, cmd
, arg
);
3229 int kernel_bind(struct socket
*sock
, struct sockaddr
*addr
, int addrlen
)
3231 return sock
->ops
->bind(sock
, addr
, addrlen
);
3233 EXPORT_SYMBOL(kernel_bind
);
3235 int kernel_listen(struct socket
*sock
, int backlog
)
3237 return sock
->ops
->listen(sock
, backlog
);
3239 EXPORT_SYMBOL(kernel_listen
);
3241 int kernel_accept(struct socket
*sock
, struct socket
**newsock
, int flags
)
3243 struct sock
*sk
= sock
->sk
;
3246 err
= sock_create_lite(sk
->sk_family
, sk
->sk_type
, sk
->sk_protocol
,
3251 err
= sock
->ops
->accept(sock
, *newsock
, flags
, true);
3253 sock_release(*newsock
);
3258 (*newsock
)->ops
= sock
->ops
;
3259 __module_get((*newsock
)->ops
->owner
);
3264 EXPORT_SYMBOL(kernel_accept
);
3266 int kernel_connect(struct socket
*sock
, struct sockaddr
*addr
, int addrlen
,
3269 return sock
->ops
->connect(sock
, addr
, addrlen
, flags
);
3271 EXPORT_SYMBOL(kernel_connect
);
3273 int kernel_getsockname(struct socket
*sock
, struct sockaddr
*addr
)
3275 return sock
->ops
->getname(sock
, addr
, 0);
3277 EXPORT_SYMBOL(kernel_getsockname
);
3279 int kernel_getpeername(struct socket
*sock
, struct sockaddr
*addr
)
3281 return sock
->ops
->getname(sock
, addr
, 1);
3283 EXPORT_SYMBOL(kernel_getpeername
);
3285 int kernel_getsockopt(struct socket
*sock
, int level
, int optname
,
3286 char *optval
, int *optlen
)
3288 mm_segment_t oldfs
= get_fs();
3289 char __user
*uoptval
;
3290 int __user
*uoptlen
;
3293 uoptval
= (char __user __force
*) optval
;
3294 uoptlen
= (int __user __force
*) optlen
;
3297 if (level
== SOL_SOCKET
)
3298 err
= sock_getsockopt(sock
, level
, optname
, uoptval
, uoptlen
);
3300 err
= sock
->ops
->getsockopt(sock
, level
, optname
, uoptval
,
3305 EXPORT_SYMBOL(kernel_getsockopt
);
3307 int kernel_setsockopt(struct socket
*sock
, int level
, int optname
,
3308 char *optval
, unsigned int optlen
)
3310 mm_segment_t oldfs
= get_fs();
3311 char __user
*uoptval
;
3314 uoptval
= (char __user __force
*) optval
;
3317 if (level
== SOL_SOCKET
)
3318 err
= sock_setsockopt(sock
, level
, optname
, uoptval
, optlen
);
3320 err
= sock
->ops
->setsockopt(sock
, level
, optname
, uoptval
,
3325 EXPORT_SYMBOL(kernel_setsockopt
);
3327 int kernel_sendpage(struct socket
*sock
, struct page
*page
, int offset
,
3328 size_t size
, int flags
)
3330 if (sock
->ops
->sendpage
)
3331 return sock
->ops
->sendpage(sock
, page
, offset
, size
, flags
);
3333 return sock_no_sendpage(sock
, page
, offset
, size
, flags
);
3335 EXPORT_SYMBOL(kernel_sendpage
);
3337 int kernel_sendpage_locked(struct sock
*sk
, struct page
*page
, int offset
,
3338 size_t size
, int flags
)
3340 struct socket
*sock
= sk
->sk_socket
;
3342 if (sock
->ops
->sendpage_locked
)
3343 return sock
->ops
->sendpage_locked(sk
, page
, offset
, size
,
3346 return sock_no_sendpage_locked(sk
, page
, offset
, size
, flags
);
3348 EXPORT_SYMBOL(kernel_sendpage_locked
);
3350 int kernel_sock_shutdown(struct socket
*sock
, enum sock_shutdown_cmd how
)
3352 return sock
->ops
->shutdown(sock
, how
);
3354 EXPORT_SYMBOL(kernel_sock_shutdown
);
3356 /* This routine returns the IP overhead imposed by a socket i.e.
3357 * the length of the underlying IP header, depending on whether
3358 * this is an IPv4 or IPv6 socket and the length from IP options turned
3359 * on at the socket. Assumes that the caller has a lock on the socket.
3361 u32
kernel_sock_ip_overhead(struct sock
*sk
)
3363 struct inet_sock
*inet
;
3364 struct ip_options_rcu
*opt
;
3366 #if IS_ENABLED(CONFIG_IPV6)
3367 struct ipv6_pinfo
*np
;
3368 struct ipv6_txoptions
*optv6
= NULL
;
3369 #endif /* IS_ENABLED(CONFIG_IPV6) */
3374 switch (sk
->sk_family
) {
3377 overhead
+= sizeof(struct iphdr
);
3378 opt
= rcu_dereference_protected(inet
->inet_opt
,
3379 sock_owned_by_user(sk
));
3381 overhead
+= opt
->opt
.optlen
;
3383 #if IS_ENABLED(CONFIG_IPV6)
3386 overhead
+= sizeof(struct ipv6hdr
);
3388 optv6
= rcu_dereference_protected(np
->opt
,
3389 sock_owned_by_user(sk
));
3391 overhead
+= (optv6
->opt_flen
+ optv6
->opt_nflen
);
3393 #endif /* IS_ENABLED(CONFIG_IPV6) */
3394 default: /* Returns 0 overhead if the socket is not ipv4 or ipv6 */
3398 EXPORT_SYMBOL(kernel_sock_ip_overhead
);