1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * NET An implementation of the SOCKET network access protocol.
5 * Version: @(#)socket.c 1.1.93 18/02/95
7 * Authors: Orest Zborowski, <obz@Kodak.COM>
9 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
12 * Anonymous : NOTSOCK/BADF cleanup. Error fix in
14 * Alan Cox : verify_area() fixes
15 * Alan Cox : Removed DDI
16 * Jonathan Kamens : SOCK_DGRAM reconnect bug
17 * Alan Cox : Moved a load of checks to the very
19 * Alan Cox : Move address structures to/from user
20 * mode above the protocol layers.
21 * Rob Janssen : Allow 0 length sends.
22 * Alan Cox : Asynchronous I/O support (cribbed from the
24 * Niibe Yutaka : Asynchronous I/O for writes (4.4BSD style)
25 * Jeff Uphoff : Made max number of sockets command-line
27 * Matti Aarnio : Made the number of sockets dynamic,
28 * to be allocated when needed, and mr.
29 * Uphoff's max is used as max to be
30 * allowed to allocate.
31 * Linus : Argh. removed all the socket allocation
32 * altogether: it's in the inode now.
33 * Alan Cox : Made sock_alloc()/sock_release() public
34 * for NetROM and future kernel nfsd type
36 * Alan Cox : sendmsg/recvmsg basics.
37 * Tom Dyas : Export net symbols.
38 * Marcin Dalecki : Fixed problems with CONFIG_NET="n".
39 * Alan Cox : Added thread locking to sys_* calls
40 * for sockets. May have errors at the
42 * Kevin Buhr : Fixed the dumb errors in the above.
43 * Andi Kleen : Some small cleanups, optimizations,
44 * and fixed a copy_from_user() bug.
45 * Tigran Aivazian : sys_send(args) calls sys_sendto(args, NULL, 0)
46 * Tigran Aivazian : Made listen(2) backlog sanity checks
47 * protocol-independent
49 * This module is effectively the top level interface to the BSD socket
52 * Based upon Swansea University Computer Society NET3.039
55 #include <linux/ethtool.h>
57 #include <linux/socket.h>
58 #include <linux/file.h>
59 #include <linux/net.h>
60 #include <linux/interrupt.h>
61 #include <linux/thread_info.h>
62 #include <linux/rcupdate.h>
63 #include <linux/netdevice.h>
64 #include <linux/proc_fs.h>
65 #include <linux/seq_file.h>
66 #include <linux/mutex.h>
67 #include <linux/if_bridge.h>
68 #include <linux/if_vlan.h>
69 #include <linux/ptp_classify.h>
70 #include <linux/init.h>
71 #include <linux/poll.h>
72 #include <linux/cache.h>
73 #include <linux/module.h>
74 #include <linux/highmem.h>
75 #include <linux/mount.h>
76 #include <linux/pseudo_fs.h>
77 #include <linux/security.h>
78 #include <linux/syscalls.h>
79 #include <linux/compat.h>
80 #include <linux/kmod.h>
81 #include <linux/audit.h>
82 #include <linux/wireless.h>
83 #include <linux/nsproxy.h>
84 #include <linux/magic.h>
85 #include <linux/slab.h>
86 #include <linux/xattr.h>
87 #include <linux/nospec.h>
88 #include <linux/indirect_call_wrapper.h>
90 #include <linux/uaccess.h>
91 #include <asm/unistd.h>
93 #include <net/compat.h>
95 #include <net/cls_cgroup.h>
98 #include <linux/netfilter.h>
100 #include <linux/if_tun.h>
101 #include <linux/ipv6_route.h>
102 #include <linux/route.h>
103 #include <linux/termios.h>
104 #include <linux/sockios.h>
105 #include <net/busy_poll.h>
106 #include <linux/errqueue.h>
107 #include <linux/ptp_clock_kernel.h>
109 #ifdef CONFIG_NET_RX_BUSY_POLL
110 unsigned int sysctl_net_busy_read __read_mostly
;
111 unsigned int sysctl_net_busy_poll __read_mostly
;
114 static ssize_t
sock_read_iter(struct kiocb
*iocb
, struct iov_iter
*to
);
115 static ssize_t
sock_write_iter(struct kiocb
*iocb
, struct iov_iter
*from
);
116 static int sock_mmap(struct file
*file
, struct vm_area_struct
*vma
);
118 static int sock_close(struct inode
*inode
, struct file
*file
);
119 static __poll_t
sock_poll(struct file
*file
,
120 struct poll_table_struct
*wait
);
121 static long sock_ioctl(struct file
*file
, unsigned int cmd
, unsigned long arg
);
123 static long compat_sock_ioctl(struct file
*file
,
124 unsigned int cmd
, unsigned long arg
);
126 static int sock_fasync(int fd
, struct file
*filp
, int on
);
127 static ssize_t
sock_sendpage(struct file
*file
, struct page
*page
,
128 int offset
, size_t size
, loff_t
*ppos
, int more
);
129 static ssize_t
sock_splice_read(struct file
*file
, loff_t
*ppos
,
130 struct pipe_inode_info
*pipe
, size_t len
,
133 #ifdef CONFIG_PROC_FS
134 static void sock_show_fdinfo(struct seq_file
*m
, struct file
*f
)
136 struct socket
*sock
= f
->private_data
;
138 if (sock
->ops
->show_fdinfo
)
139 sock
->ops
->show_fdinfo(m
, sock
);
142 #define sock_show_fdinfo NULL
146 * Socket files have a set of 'special' operations as well as the generic file ones. These don't appear
147 * in the operation structures but are done directly via the socketcall() multiplexor.
150 static const struct file_operations socket_file_ops
= {
151 .owner
= THIS_MODULE
,
153 .read_iter
= sock_read_iter
,
154 .write_iter
= sock_write_iter
,
156 .unlocked_ioctl
= sock_ioctl
,
158 .compat_ioctl
= compat_sock_ioctl
,
161 .release
= sock_close
,
162 .fasync
= sock_fasync
,
163 .sendpage
= sock_sendpage
,
164 .splice_write
= generic_splice_sendpage
,
165 .splice_read
= sock_splice_read
,
166 .show_fdinfo
= sock_show_fdinfo
,
169 static const char * const pf_family_names
[] = {
170 [PF_UNSPEC
] = "PF_UNSPEC",
171 [PF_UNIX
] = "PF_UNIX/PF_LOCAL",
172 [PF_INET
] = "PF_INET",
173 [PF_AX25
] = "PF_AX25",
175 [PF_APPLETALK
] = "PF_APPLETALK",
176 [PF_NETROM
] = "PF_NETROM",
177 [PF_BRIDGE
] = "PF_BRIDGE",
178 [PF_ATMPVC
] = "PF_ATMPVC",
180 [PF_INET6
] = "PF_INET6",
181 [PF_ROSE
] = "PF_ROSE",
182 [PF_DECnet
] = "PF_DECnet",
183 [PF_NETBEUI
] = "PF_NETBEUI",
184 [PF_SECURITY
] = "PF_SECURITY",
186 [PF_NETLINK
] = "PF_NETLINK/PF_ROUTE",
187 [PF_PACKET
] = "PF_PACKET",
189 [PF_ECONET
] = "PF_ECONET",
190 [PF_ATMSVC
] = "PF_ATMSVC",
193 [PF_IRDA
] = "PF_IRDA",
194 [PF_PPPOX
] = "PF_PPPOX",
195 [PF_WANPIPE
] = "PF_WANPIPE",
198 [PF_MPLS
] = "PF_MPLS",
200 [PF_TIPC
] = "PF_TIPC",
201 [PF_BLUETOOTH
] = "PF_BLUETOOTH",
202 [PF_IUCV
] = "PF_IUCV",
203 [PF_RXRPC
] = "PF_RXRPC",
204 [PF_ISDN
] = "PF_ISDN",
205 [PF_PHONET
] = "PF_PHONET",
206 [PF_IEEE802154
] = "PF_IEEE802154",
207 [PF_CAIF
] = "PF_CAIF",
210 [PF_VSOCK
] = "PF_VSOCK",
212 [PF_QIPCRTR
] = "PF_QIPCRTR",
215 [PF_MCTP
] = "PF_MCTP",
219 * The protocol list. Each protocol is registered in here.
222 static DEFINE_SPINLOCK(net_family_lock
);
223 static const struct net_proto_family __rcu
*net_families
[NPROTO
] __read_mostly
;
227 * Move socket addresses back and forth across the kernel/user
228 * divide and look after the messy bits.
232 * move_addr_to_kernel - copy a socket address into kernel space
233 * @uaddr: Address in user space
234 * @kaddr: Address in kernel space
235 * @ulen: Length in user space
237 * The address is copied into kernel space. If the provided address is
238 * too long an error code of -EINVAL is returned. If the copy gives
239 * invalid addresses -EFAULT is returned. On a success 0 is returned.
242 int move_addr_to_kernel(void __user
*uaddr
, int ulen
, struct sockaddr_storage
*kaddr
)
244 if (ulen
< 0 || ulen
> sizeof(struct sockaddr_storage
))
248 if (copy_from_user(kaddr
, uaddr
, ulen
))
250 return audit_sockaddr(ulen
, kaddr
);
254 * move_addr_to_user - copy an address to user space
255 * @kaddr: kernel space address
256 * @klen: length of address in kernel
257 * @uaddr: user space address
258 * @ulen: pointer to user length field
260 * The value pointed to by ulen on entry is the buffer length available.
261 * This is overwritten with the buffer space used. -EINVAL is returned
262 * if an overlong buffer is specified or a negative buffer size. -EFAULT
263 * is returned if either the buffer or the length field are not
265 * After copying the data up to the limit the user specifies, the true
266 * length of the data is written over the length limit the user
267 * specified. Zero is returned for a success.
270 static int move_addr_to_user(struct sockaddr_storage
*kaddr
, int klen
,
271 void __user
*uaddr
, int __user
*ulen
)
276 BUG_ON(klen
> sizeof(struct sockaddr_storage
));
277 err
= get_user(len
, ulen
);
285 if (audit_sockaddr(klen
, kaddr
))
287 if (copy_to_user(uaddr
, kaddr
, len
))
291 * "fromlen shall refer to the value before truncation.."
294 return __put_user(klen
, ulen
);
297 static struct kmem_cache
*sock_inode_cachep __ro_after_init
;
299 static struct inode
*sock_alloc_inode(struct super_block
*sb
)
301 struct socket_alloc
*ei
;
303 ei
= kmem_cache_alloc(sock_inode_cachep
, GFP_KERNEL
);
306 init_waitqueue_head(&ei
->socket
.wq
.wait
);
307 ei
->socket
.wq
.fasync_list
= NULL
;
308 ei
->socket
.wq
.flags
= 0;
310 ei
->socket
.state
= SS_UNCONNECTED
;
311 ei
->socket
.flags
= 0;
312 ei
->socket
.ops
= NULL
;
313 ei
->socket
.sk
= NULL
;
314 ei
->socket
.file
= NULL
;
316 return &ei
->vfs_inode
;
319 static void sock_free_inode(struct inode
*inode
)
321 struct socket_alloc
*ei
;
323 ei
= container_of(inode
, struct socket_alloc
, vfs_inode
);
324 kmem_cache_free(sock_inode_cachep
, ei
);
327 static void init_once(void *foo
)
329 struct socket_alloc
*ei
= (struct socket_alloc
*)foo
;
331 inode_init_once(&ei
->vfs_inode
);
334 static void init_inodecache(void)
336 sock_inode_cachep
= kmem_cache_create("sock_inode_cache",
337 sizeof(struct socket_alloc
),
339 (SLAB_HWCACHE_ALIGN
|
340 SLAB_RECLAIM_ACCOUNT
|
341 SLAB_MEM_SPREAD
| SLAB_ACCOUNT
),
343 BUG_ON(sock_inode_cachep
== NULL
);
346 static const struct super_operations sockfs_ops
= {
347 .alloc_inode
= sock_alloc_inode
,
348 .free_inode
= sock_free_inode
,
349 .statfs
= simple_statfs
,
353 * sockfs_dname() is called from d_path().
355 static char *sockfs_dname(struct dentry
*dentry
, char *buffer
, int buflen
)
357 return dynamic_dname(dentry
, buffer
, buflen
, "socket:[%lu]",
358 d_inode(dentry
)->i_ino
);
361 static const struct dentry_operations sockfs_dentry_operations
= {
362 .d_dname
= sockfs_dname
,
365 static int sockfs_xattr_get(const struct xattr_handler
*handler
,
366 struct dentry
*dentry
, struct inode
*inode
,
367 const char *suffix
, void *value
, size_t size
)
370 if (dentry
->d_name
.len
+ 1 > size
)
372 memcpy(value
, dentry
->d_name
.name
, dentry
->d_name
.len
+ 1);
374 return dentry
->d_name
.len
+ 1;
377 #define XATTR_SOCKPROTONAME_SUFFIX "sockprotoname"
378 #define XATTR_NAME_SOCKPROTONAME (XATTR_SYSTEM_PREFIX XATTR_SOCKPROTONAME_SUFFIX)
379 #define XATTR_NAME_SOCKPROTONAME_LEN (sizeof(XATTR_NAME_SOCKPROTONAME)-1)
381 static const struct xattr_handler sockfs_xattr_handler
= {
382 .name
= XATTR_NAME_SOCKPROTONAME
,
383 .get
= sockfs_xattr_get
,
386 static int sockfs_security_xattr_set(const struct xattr_handler
*handler
,
387 struct user_namespace
*mnt_userns
,
388 struct dentry
*dentry
, struct inode
*inode
,
389 const char *suffix
, const void *value
,
390 size_t size
, int flags
)
392 /* Handled by LSM. */
396 static const struct xattr_handler sockfs_security_xattr_handler
= {
397 .prefix
= XATTR_SECURITY_PREFIX
,
398 .set
= sockfs_security_xattr_set
,
401 static const struct xattr_handler
*sockfs_xattr_handlers
[] = {
402 &sockfs_xattr_handler
,
403 &sockfs_security_xattr_handler
,
407 static int sockfs_init_fs_context(struct fs_context
*fc
)
409 struct pseudo_fs_context
*ctx
= init_pseudo(fc
, SOCKFS_MAGIC
);
412 ctx
->ops
= &sockfs_ops
;
413 ctx
->dops
= &sockfs_dentry_operations
;
414 ctx
->xattr
= sockfs_xattr_handlers
;
418 static struct vfsmount
*sock_mnt __read_mostly
;
420 static struct file_system_type sock_fs_type
= {
422 .init_fs_context
= sockfs_init_fs_context
,
423 .kill_sb
= kill_anon_super
,
427 * Obtains the first available file descriptor and sets it up for use.
429 * These functions create file structures and maps them to fd space
430 * of the current process. On success it returns file descriptor
431 * and file struct implicitly stored in sock->file.
432 * Note that another thread may close file descriptor before we return
433 * from this function. We use the fact that now we do not refer
434 * to socket after mapping. If one day we will need it, this
435 * function will increment ref. count on file by 1.
437 * In any case returned fd MAY BE not valid!
438 * This race condition is unavoidable
439 * with shared fd spaces, we cannot solve it inside kernel,
440 * but we take care of internal coherence yet.
444 * sock_alloc_file - Bind a &socket to a &file
446 * @flags: file status flags
447 * @dname: protocol name
449 * Returns the &file bound with @sock, implicitly storing it
450 * in sock->file. If dname is %NULL, sets to "".
451 * On failure the return is a ERR pointer (see linux/err.h).
452 * This function uses GFP_KERNEL internally.
455 struct file
*sock_alloc_file(struct socket
*sock
, int flags
, const char *dname
)
460 dname
= sock
->sk
? sock
->sk
->sk_prot_creator
->name
: "";
462 file
= alloc_file_pseudo(SOCK_INODE(sock
), sock_mnt
, dname
,
463 O_RDWR
| (flags
& O_NONBLOCK
),
471 file
->private_data
= sock
;
472 stream_open(SOCK_INODE(sock
), file
);
475 EXPORT_SYMBOL(sock_alloc_file
);
477 static int sock_map_fd(struct socket
*sock
, int flags
)
479 struct file
*newfile
;
480 int fd
= get_unused_fd_flags(flags
);
481 if (unlikely(fd
< 0)) {
486 newfile
= sock_alloc_file(sock
, flags
, NULL
);
487 if (!IS_ERR(newfile
)) {
488 fd_install(fd
, newfile
);
493 return PTR_ERR(newfile
);
497 * sock_from_file - Return the &socket bounded to @file.
500 * On failure returns %NULL.
503 struct socket
*sock_from_file(struct file
*file
)
505 if (file
->f_op
== &socket_file_ops
)
506 return file
->private_data
; /* set in sock_map_fd */
510 EXPORT_SYMBOL(sock_from_file
);
513 * sockfd_lookup - Go from a file number to its socket slot
515 * @err: pointer to an error code return
517 * The file handle passed in is locked and the socket it is bound
518 * to is returned. If an error occurs the err pointer is overwritten
519 * with a negative errno code and NULL is returned. The function checks
520 * for both invalid handles and passing a handle which is not a socket.
522 * On a success the socket object pointer is returned.
525 struct socket
*sockfd_lookup(int fd
, int *err
)
536 sock
= sock_from_file(file
);
543 EXPORT_SYMBOL(sockfd_lookup
);
545 static struct socket
*sockfd_lookup_light(int fd
, int *err
, int *fput_needed
)
547 struct fd f
= fdget(fd
);
552 sock
= sock_from_file(f
.file
);
554 *fput_needed
= f
.flags
& FDPUT_FPUT
;
563 static ssize_t
sockfs_listxattr(struct dentry
*dentry
, char *buffer
,
569 len
= security_inode_listsecurity(d_inode(dentry
), buffer
, size
);
579 len
= (XATTR_NAME_SOCKPROTONAME_LEN
+ 1);
584 memcpy(buffer
, XATTR_NAME_SOCKPROTONAME
, len
);
591 static int sockfs_setattr(struct user_namespace
*mnt_userns
,
592 struct dentry
*dentry
, struct iattr
*iattr
)
594 int err
= simple_setattr(&init_user_ns
, dentry
, iattr
);
596 if (!err
&& (iattr
->ia_valid
& ATTR_UID
)) {
597 struct socket
*sock
= SOCKET_I(d_inode(dentry
));
600 sock
->sk
->sk_uid
= iattr
->ia_uid
;
608 static const struct inode_operations sockfs_inode_ops
= {
609 .listxattr
= sockfs_listxattr
,
610 .setattr
= sockfs_setattr
,
614 * sock_alloc - allocate a socket
616 * Allocate a new inode and socket object. The two are bound together
617 * and initialised. The socket is then returned. If we are out of inodes
618 * NULL is returned. This functions uses GFP_KERNEL internally.
621 struct socket
*sock_alloc(void)
626 inode
= new_inode_pseudo(sock_mnt
->mnt_sb
);
630 sock
= SOCKET_I(inode
);
632 inode
->i_ino
= get_next_ino();
633 inode
->i_mode
= S_IFSOCK
| S_IRWXUGO
;
634 inode
->i_uid
= current_fsuid();
635 inode
->i_gid
= current_fsgid();
636 inode
->i_op
= &sockfs_inode_ops
;
640 EXPORT_SYMBOL(sock_alloc
);
642 static void __sock_release(struct socket
*sock
, struct inode
*inode
)
645 struct module
*owner
= sock
->ops
->owner
;
649 sock
->ops
->release(sock
);
657 if (sock
->wq
.fasync_list
)
658 pr_err("%s: fasync list not empty!\n", __func__
);
661 iput(SOCK_INODE(sock
));
668 * sock_release - close a socket
669 * @sock: socket to close
671 * The socket is released from the protocol stack if it has a release
672 * callback, and the inode is then released if the socket is bound to
673 * an inode not a file.
675 void sock_release(struct socket
*sock
)
677 __sock_release(sock
, NULL
);
679 EXPORT_SYMBOL(sock_release
);
681 void __sock_tx_timestamp(__u16 tsflags
, __u8
*tx_flags
)
683 u8 flags
= *tx_flags
;
685 if (tsflags
& SOF_TIMESTAMPING_TX_HARDWARE
)
686 flags
|= SKBTX_HW_TSTAMP
;
688 if (tsflags
& SOF_TIMESTAMPING_TX_SOFTWARE
)
689 flags
|= SKBTX_SW_TSTAMP
;
691 if (tsflags
& SOF_TIMESTAMPING_TX_SCHED
)
692 flags
|= SKBTX_SCHED_TSTAMP
;
696 EXPORT_SYMBOL(__sock_tx_timestamp
);
698 INDIRECT_CALLABLE_DECLARE(int inet_sendmsg(struct socket
*, struct msghdr
*,
700 INDIRECT_CALLABLE_DECLARE(int inet6_sendmsg(struct socket
*, struct msghdr
*,
702 static inline int sock_sendmsg_nosec(struct socket
*sock
, struct msghdr
*msg
)
704 int ret
= INDIRECT_CALL_INET(sock
->ops
->sendmsg
, inet6_sendmsg
,
705 inet_sendmsg
, sock
, msg
,
707 BUG_ON(ret
== -EIOCBQUEUED
);
712 * sock_sendmsg - send a message through @sock
714 * @msg: message to send
716 * Sends @msg through @sock, passing through LSM.
717 * Returns the number of bytes sent, or an error code.
719 int sock_sendmsg(struct socket
*sock
, struct msghdr
*msg
)
721 int err
= security_socket_sendmsg(sock
, msg
,
724 return err
?: sock_sendmsg_nosec(sock
, msg
);
726 EXPORT_SYMBOL(sock_sendmsg
);
729 * kernel_sendmsg - send a message through @sock (kernel-space)
731 * @msg: message header
733 * @num: vec array length
734 * @size: total message data size
736 * Builds the message data with @vec and sends it through @sock.
737 * Returns the number of bytes sent, or an error code.
740 int kernel_sendmsg(struct socket
*sock
, struct msghdr
*msg
,
741 struct kvec
*vec
, size_t num
, size_t size
)
743 iov_iter_kvec(&msg
->msg_iter
, WRITE
, vec
, num
, size
);
744 return sock_sendmsg(sock
, msg
);
746 EXPORT_SYMBOL(kernel_sendmsg
);
749 * kernel_sendmsg_locked - send a message through @sock (kernel-space)
751 * @msg: message header
752 * @vec: output s/g array
753 * @num: output s/g array length
754 * @size: total message data size
756 * Builds the message data with @vec and sends it through @sock.
757 * Returns the number of bytes sent, or an error code.
758 * Caller must hold @sk.
761 int kernel_sendmsg_locked(struct sock
*sk
, struct msghdr
*msg
,
762 struct kvec
*vec
, size_t num
, size_t size
)
764 struct socket
*sock
= sk
->sk_socket
;
766 if (!sock
->ops
->sendmsg_locked
)
767 return sock_no_sendmsg_locked(sk
, msg
, size
);
769 iov_iter_kvec(&msg
->msg_iter
, WRITE
, vec
, num
, size
);
771 return sock
->ops
->sendmsg_locked(sk
, msg
, msg_data_left(msg
));
773 EXPORT_SYMBOL(kernel_sendmsg_locked
);
775 static bool skb_is_err_queue(const struct sk_buff
*skb
)
777 /* pkt_type of skbs enqueued on the error queue are set to
778 * PACKET_OUTGOING in skb_set_err_queue(). This is only safe to do
779 * in recvmsg, since skbs received on a local socket will never
780 * have a pkt_type of PACKET_OUTGOING.
782 return skb
->pkt_type
== PACKET_OUTGOING
;
785 /* On transmit, software and hardware timestamps are returned independently.
786 * As the two skb clones share the hardware timestamp, which may be updated
787 * before the software timestamp is received, a hardware TX timestamp may be
788 * returned only if there is no software TX timestamp. Ignore false software
789 * timestamps, which may be made in the __sock_recv_timestamp() call when the
790 * option SO_TIMESTAMP_OLD(NS) is enabled on the socket, even when the skb has a
791 * hardware timestamp.
793 static bool skb_is_swtx_tstamp(const struct sk_buff
*skb
, int false_tstamp
)
795 return skb
->tstamp
&& !false_tstamp
&& skb_is_err_queue(skb
);
798 static void put_ts_pktinfo(struct msghdr
*msg
, struct sk_buff
*skb
)
800 struct scm_ts_pktinfo ts_pktinfo
;
801 struct net_device
*orig_dev
;
803 if (!skb_mac_header_was_set(skb
))
806 memset(&ts_pktinfo
, 0, sizeof(ts_pktinfo
));
809 orig_dev
= dev_get_by_napi_id(skb_napi_id(skb
));
811 ts_pktinfo
.if_index
= orig_dev
->ifindex
;
814 ts_pktinfo
.pkt_length
= skb
->len
- skb_mac_offset(skb
);
815 put_cmsg(msg
, SOL_SOCKET
, SCM_TIMESTAMPING_PKTINFO
,
816 sizeof(ts_pktinfo
), &ts_pktinfo
);
820 * called from sock_recv_timestamp() if sock_flag(sk, SOCK_RCVTSTAMP)
822 void __sock_recv_timestamp(struct msghdr
*msg
, struct sock
*sk
,
825 int need_software_tstamp
= sock_flag(sk
, SOCK_RCVTSTAMP
);
826 int new_tstamp
= sock_flag(sk
, SOCK_TSTAMP_NEW
);
827 struct scm_timestamping_internal tss
;
829 int empty
= 1, false_tstamp
= 0;
830 struct skb_shared_hwtstamps
*shhwtstamps
=
833 /* Race occurred between timestamp enabling and packet
834 receiving. Fill in the current time for now. */
835 if (need_software_tstamp
&& skb
->tstamp
== 0) {
836 __net_timestamp(skb
);
840 if (need_software_tstamp
) {
841 if (!sock_flag(sk
, SOCK_RCVTSTAMPNS
)) {
843 struct __kernel_sock_timeval tv
;
845 skb_get_new_timestamp(skb
, &tv
);
846 put_cmsg(msg
, SOL_SOCKET
, SO_TIMESTAMP_NEW
,
849 struct __kernel_old_timeval tv
;
851 skb_get_timestamp(skb
, &tv
);
852 put_cmsg(msg
, SOL_SOCKET
, SO_TIMESTAMP_OLD
,
857 struct __kernel_timespec ts
;
859 skb_get_new_timestampns(skb
, &ts
);
860 put_cmsg(msg
, SOL_SOCKET
, SO_TIMESTAMPNS_NEW
,
863 struct __kernel_old_timespec ts
;
865 skb_get_timestampns(skb
, &ts
);
866 put_cmsg(msg
, SOL_SOCKET
, SO_TIMESTAMPNS_OLD
,
872 memset(&tss
, 0, sizeof(tss
));
873 if ((sk
->sk_tsflags
& SOF_TIMESTAMPING_SOFTWARE
) &&
874 ktime_to_timespec64_cond(skb
->tstamp
, tss
.ts
+ 0))
877 (sk
->sk_tsflags
& SOF_TIMESTAMPING_RAW_HARDWARE
) &&
878 !skb_is_swtx_tstamp(skb
, false_tstamp
)) {
879 if (sk
->sk_tsflags
& SOF_TIMESTAMPING_BIND_PHC
)
880 ptp_convert_timestamp(shhwtstamps
, sk
->sk_bind_phc
);
882 if (ktime_to_timespec64_cond(shhwtstamps
->hwtstamp
,
886 if ((sk
->sk_tsflags
& SOF_TIMESTAMPING_OPT_PKTINFO
) &&
887 !skb_is_err_queue(skb
))
888 put_ts_pktinfo(msg
, skb
);
892 if (sock_flag(sk
, SOCK_TSTAMP_NEW
))
893 put_cmsg_scm_timestamping64(msg
, &tss
);
895 put_cmsg_scm_timestamping(msg
, &tss
);
897 if (skb_is_err_queue(skb
) && skb
->len
&&
898 SKB_EXT_ERR(skb
)->opt_stats
)
899 put_cmsg(msg
, SOL_SOCKET
, SCM_TIMESTAMPING_OPT_STATS
,
900 skb
->len
, skb
->data
);
903 EXPORT_SYMBOL_GPL(__sock_recv_timestamp
);
905 void __sock_recv_wifi_status(struct msghdr
*msg
, struct sock
*sk
,
910 if (!sock_flag(sk
, SOCK_WIFI_STATUS
))
912 if (!skb
->wifi_acked_valid
)
915 ack
= skb
->wifi_acked
;
917 put_cmsg(msg
, SOL_SOCKET
, SCM_WIFI_STATUS
, sizeof(ack
), &ack
);
919 EXPORT_SYMBOL_GPL(__sock_recv_wifi_status
);
921 static inline void sock_recv_drops(struct msghdr
*msg
, struct sock
*sk
,
924 if (sock_flag(sk
, SOCK_RXQ_OVFL
) && skb
&& SOCK_SKB_CB(skb
)->dropcount
)
925 put_cmsg(msg
, SOL_SOCKET
, SO_RXQ_OVFL
,
926 sizeof(__u32
), &SOCK_SKB_CB(skb
)->dropcount
);
929 void __sock_recv_ts_and_drops(struct msghdr
*msg
, struct sock
*sk
,
932 sock_recv_timestamp(msg
, sk
, skb
);
933 sock_recv_drops(msg
, sk
, skb
);
935 EXPORT_SYMBOL_GPL(__sock_recv_ts_and_drops
);
937 INDIRECT_CALLABLE_DECLARE(int inet_recvmsg(struct socket
*, struct msghdr
*,
939 INDIRECT_CALLABLE_DECLARE(int inet6_recvmsg(struct socket
*, struct msghdr
*,
941 static inline int sock_recvmsg_nosec(struct socket
*sock
, struct msghdr
*msg
,
944 return INDIRECT_CALL_INET(sock
->ops
->recvmsg
, inet6_recvmsg
,
945 inet_recvmsg
, sock
, msg
, msg_data_left(msg
),
950 * sock_recvmsg - receive a message from @sock
952 * @msg: message to receive
953 * @flags: message flags
955 * Receives @msg from @sock, passing through LSM. Returns the total number
956 * of bytes received, or an error.
958 int sock_recvmsg(struct socket
*sock
, struct msghdr
*msg
, int flags
)
960 int err
= security_socket_recvmsg(sock
, msg
, msg_data_left(msg
), flags
);
962 return err
?: sock_recvmsg_nosec(sock
, msg
, flags
);
964 EXPORT_SYMBOL(sock_recvmsg
);
967 * kernel_recvmsg - Receive a message from a socket (kernel space)
968 * @sock: The socket to receive the message from
969 * @msg: Received message
970 * @vec: Input s/g array for message data
971 * @num: Size of input s/g array
972 * @size: Number of bytes to read
973 * @flags: Message flags (MSG_DONTWAIT, etc...)
975 * On return the msg structure contains the scatter/gather array passed in the
976 * vec argument. The array is modified so that it consists of the unfilled
977 * portion of the original array.
979 * The returned value is the total number of bytes received, or an error.
982 int kernel_recvmsg(struct socket
*sock
, struct msghdr
*msg
,
983 struct kvec
*vec
, size_t num
, size_t size
, int flags
)
985 msg
->msg_control_is_user
= false;
986 iov_iter_kvec(&msg
->msg_iter
, READ
, vec
, num
, size
);
987 return sock_recvmsg(sock
, msg
, flags
);
989 EXPORT_SYMBOL(kernel_recvmsg
);
991 static ssize_t
sock_sendpage(struct file
*file
, struct page
*page
,
992 int offset
, size_t size
, loff_t
*ppos
, int more
)
997 sock
= file
->private_data
;
999 flags
= (file
->f_flags
& O_NONBLOCK
) ? MSG_DONTWAIT
: 0;
1000 /* more is a combination of MSG_MORE and MSG_SENDPAGE_NOTLAST */
1003 return kernel_sendpage(sock
, page
, offset
, size
, flags
);
1006 static ssize_t
sock_splice_read(struct file
*file
, loff_t
*ppos
,
1007 struct pipe_inode_info
*pipe
, size_t len
,
1010 struct socket
*sock
= file
->private_data
;
1012 if (unlikely(!sock
->ops
->splice_read
))
1013 return generic_file_splice_read(file
, ppos
, pipe
, len
, flags
);
1015 return sock
->ops
->splice_read(sock
, ppos
, pipe
, len
, flags
);
1018 static ssize_t
sock_read_iter(struct kiocb
*iocb
, struct iov_iter
*to
)
1020 struct file
*file
= iocb
->ki_filp
;
1021 struct socket
*sock
= file
->private_data
;
1022 struct msghdr msg
= {.msg_iter
= *to
,
1026 if (file
->f_flags
& O_NONBLOCK
|| (iocb
->ki_flags
& IOCB_NOWAIT
))
1027 msg
.msg_flags
= MSG_DONTWAIT
;
1029 if (iocb
->ki_pos
!= 0)
1032 if (!iov_iter_count(to
)) /* Match SYS5 behaviour */
1035 res
= sock_recvmsg(sock
, &msg
, msg
.msg_flags
);
1040 static ssize_t
sock_write_iter(struct kiocb
*iocb
, struct iov_iter
*from
)
1042 struct file
*file
= iocb
->ki_filp
;
1043 struct socket
*sock
= file
->private_data
;
1044 struct msghdr msg
= {.msg_iter
= *from
,
1048 if (iocb
->ki_pos
!= 0)
1051 if (file
->f_flags
& O_NONBLOCK
|| (iocb
->ki_flags
& IOCB_NOWAIT
))
1052 msg
.msg_flags
= MSG_DONTWAIT
;
1054 if (sock
->type
== SOCK_SEQPACKET
)
1055 msg
.msg_flags
|= MSG_EOR
;
1057 res
= sock_sendmsg(sock
, &msg
);
1058 *from
= msg
.msg_iter
;
1063 * Atomic setting of ioctl hooks to avoid race
1064 * with module unload.
1067 static DEFINE_MUTEX(br_ioctl_mutex
);
1068 static int (*br_ioctl_hook
)(struct net
*net
, struct net_bridge
*br
,
1069 unsigned int cmd
, struct ifreq
*ifr
,
1072 void brioctl_set(int (*hook
)(struct net
*net
, struct net_bridge
*br
,
1073 unsigned int cmd
, struct ifreq
*ifr
,
1076 mutex_lock(&br_ioctl_mutex
);
1077 br_ioctl_hook
= hook
;
1078 mutex_unlock(&br_ioctl_mutex
);
1080 EXPORT_SYMBOL(brioctl_set
);
1082 int br_ioctl_call(struct net
*net
, struct net_bridge
*br
, unsigned int cmd
,
1083 struct ifreq
*ifr
, void __user
*uarg
)
1088 request_module("bridge");
1090 mutex_lock(&br_ioctl_mutex
);
1092 err
= br_ioctl_hook(net
, br
, cmd
, ifr
, uarg
);
1093 mutex_unlock(&br_ioctl_mutex
);
1098 static DEFINE_MUTEX(vlan_ioctl_mutex
);
1099 static int (*vlan_ioctl_hook
) (struct net
*, void __user
*arg
);
1101 void vlan_ioctl_set(int (*hook
) (struct net
*, void __user
*))
1103 mutex_lock(&vlan_ioctl_mutex
);
1104 vlan_ioctl_hook
= hook
;
1105 mutex_unlock(&vlan_ioctl_mutex
);
1107 EXPORT_SYMBOL(vlan_ioctl_set
);
1109 static long sock_do_ioctl(struct net
*net
, struct socket
*sock
,
1110 unsigned int cmd
, unsigned long arg
)
1115 void __user
*argp
= (void __user
*)arg
;
1118 err
= sock
->ops
->ioctl(sock
, cmd
, arg
);
1121 * If this ioctl is unknown try to hand it down
1122 * to the NIC driver.
1124 if (err
!= -ENOIOCTLCMD
)
1127 if (!is_socket_ioctl_cmd(cmd
))
1130 if (get_user_ifreq(&ifr
, &data
, argp
))
1132 err
= dev_ioctl(net
, cmd
, &ifr
, data
, &need_copyout
);
1133 if (!err
&& need_copyout
)
1134 if (put_user_ifreq(&ifr
, argp
))
1141 * With an ioctl, arg may well be a user mode pointer, but we don't know
1142 * what to do with it - that's up to the protocol still.
1145 static long sock_ioctl(struct file
*file
, unsigned cmd
, unsigned long arg
)
1147 struct socket
*sock
;
1149 void __user
*argp
= (void __user
*)arg
;
1153 sock
= file
->private_data
;
1156 if (unlikely(cmd
>= SIOCDEVPRIVATE
&& cmd
<= (SIOCDEVPRIVATE
+ 15))) {
1160 if (get_user_ifreq(&ifr
, &data
, argp
))
1162 err
= dev_ioctl(net
, cmd
, &ifr
, data
, &need_copyout
);
1163 if (!err
&& need_copyout
)
1164 if (put_user_ifreq(&ifr
, argp
))
1167 #ifdef CONFIG_WEXT_CORE
1168 if (cmd
>= SIOCIWFIRST
&& cmd
<= SIOCIWLAST
) {
1169 err
= wext_handle_ioctl(net
, cmd
, argp
);
1176 if (get_user(pid
, (int __user
*)argp
))
1178 err
= f_setown(sock
->file
, pid
, 1);
1182 err
= put_user(f_getown(sock
->file
),
1183 (int __user
*)argp
);
1189 err
= br_ioctl_call(net
, NULL
, cmd
, NULL
, argp
);
1194 if (!vlan_ioctl_hook
)
1195 request_module("8021q");
1197 mutex_lock(&vlan_ioctl_mutex
);
1198 if (vlan_ioctl_hook
)
1199 err
= vlan_ioctl_hook(net
, argp
);
1200 mutex_unlock(&vlan_ioctl_mutex
);
1204 if (!ns_capable(net
->user_ns
, CAP_NET_ADMIN
))
1207 err
= open_related_ns(&net
->ns
, get_net_ns
);
1209 case SIOCGSTAMP_OLD
:
1210 case SIOCGSTAMPNS_OLD
:
1211 if (!sock
->ops
->gettstamp
) {
1215 err
= sock
->ops
->gettstamp(sock
, argp
,
1216 cmd
== SIOCGSTAMP_OLD
,
1217 !IS_ENABLED(CONFIG_64BIT
));
1219 case SIOCGSTAMP_NEW
:
1220 case SIOCGSTAMPNS_NEW
:
1221 if (!sock
->ops
->gettstamp
) {
1225 err
= sock
->ops
->gettstamp(sock
, argp
,
1226 cmd
== SIOCGSTAMP_NEW
,
1231 err
= dev_ifconf(net
, argp
);
1235 err
= sock_do_ioctl(net
, sock
, cmd
, arg
);
1242 * sock_create_lite - creates a socket
1243 * @family: protocol family (AF_INET, ...)
1244 * @type: communication type (SOCK_STREAM, ...)
1245 * @protocol: protocol (0, ...)
1248 * Creates a new socket and assigns it to @res, passing through LSM.
1249 * The new socket initialization is not complete, see kernel_accept().
1250 * Returns 0 or an error. On failure @res is set to %NULL.
1251 * This function internally uses GFP_KERNEL.
1254 int sock_create_lite(int family
, int type
, int protocol
, struct socket
**res
)
1257 struct socket
*sock
= NULL
;
1259 err
= security_socket_create(family
, type
, protocol
, 1);
1263 sock
= sock_alloc();
1270 err
= security_socket_post_create(sock
, family
, type
, protocol
, 1);
1282 EXPORT_SYMBOL(sock_create_lite
);
1284 /* No kernel lock held - perfect */
1285 static __poll_t
sock_poll(struct file
*file
, poll_table
*wait
)
1287 struct socket
*sock
= file
->private_data
;
1288 __poll_t events
= poll_requested_events(wait
), flag
= 0;
1290 if (!sock
->ops
->poll
)
1293 if (sk_can_busy_loop(sock
->sk
)) {
1294 /* poll once if requested by the syscall */
1295 if (events
& POLL_BUSY_LOOP
)
1296 sk_busy_loop(sock
->sk
, 1);
1298 /* if this socket can poll_ll, tell the system call */
1299 flag
= POLL_BUSY_LOOP
;
1302 return sock
->ops
->poll(file
, sock
, wait
) | flag
;
1305 static int sock_mmap(struct file
*file
, struct vm_area_struct
*vma
)
1307 struct socket
*sock
= file
->private_data
;
1309 return sock
->ops
->mmap(file
, sock
, vma
);
1312 static int sock_close(struct inode
*inode
, struct file
*filp
)
1314 __sock_release(SOCKET_I(inode
), inode
);
1319 * Update the socket async list
1321 * Fasync_list locking strategy.
1323 * 1. fasync_list is modified only under process context socket lock
1324 * i.e. under semaphore.
1325 * 2. fasync_list is used under read_lock(&sk->sk_callback_lock)
1326 * or under socket lock
1329 static int sock_fasync(int fd
, struct file
*filp
, int on
)
1331 struct socket
*sock
= filp
->private_data
;
1332 struct sock
*sk
= sock
->sk
;
1333 struct socket_wq
*wq
= &sock
->wq
;
1339 fasync_helper(fd
, filp
, on
, &wq
->fasync_list
);
1341 if (!wq
->fasync_list
)
1342 sock_reset_flag(sk
, SOCK_FASYNC
);
1344 sock_set_flag(sk
, SOCK_FASYNC
);
1350 /* This function may be called only under rcu_lock */
1352 int sock_wake_async(struct socket_wq
*wq
, int how
, int band
)
1354 if (!wq
|| !wq
->fasync_list
)
1358 case SOCK_WAKE_WAITD
:
1359 if (test_bit(SOCKWQ_ASYNC_WAITDATA
, &wq
->flags
))
1362 case SOCK_WAKE_SPACE
:
1363 if (!test_and_clear_bit(SOCKWQ_ASYNC_NOSPACE
, &wq
->flags
))
1368 kill_fasync(&wq
->fasync_list
, SIGIO
, band
);
1371 kill_fasync(&wq
->fasync_list
, SIGURG
, band
);
1376 EXPORT_SYMBOL(sock_wake_async
);
1379 * __sock_create - creates a socket
1380 * @net: net namespace
1381 * @family: protocol family (AF_INET, ...)
1382 * @type: communication type (SOCK_STREAM, ...)
1383 * @protocol: protocol (0, ...)
1385 * @kern: boolean for kernel space sockets
1387 * Creates a new socket and assigns it to @res, passing through LSM.
1388 * Returns 0 or an error. On failure @res is set to %NULL. @kern must
1389 * be set to true if the socket resides in kernel space.
1390 * This function internally uses GFP_KERNEL.
1393 int __sock_create(struct net
*net
, int family
, int type
, int protocol
,
1394 struct socket
**res
, int kern
)
1397 struct socket
*sock
;
1398 const struct net_proto_family
*pf
;
1401 * Check protocol is in range
1403 if (family
< 0 || family
>= NPROTO
)
1404 return -EAFNOSUPPORT
;
1405 if (type
< 0 || type
>= SOCK_MAX
)
1410 This uglymoron is moved from INET layer to here to avoid
1411 deadlock in module load.
1413 if (family
== PF_INET
&& type
== SOCK_PACKET
) {
1414 pr_info_once("%s uses obsolete (PF_INET,SOCK_PACKET)\n",
1419 err
= security_socket_create(family
, type
, protocol
, kern
);
1424 * Allocate the socket and allow the family to set things up. if
1425 * the protocol is 0, the family is instructed to select an appropriate
1428 sock
= sock_alloc();
1430 net_warn_ratelimited("socket: no more sockets\n");
1431 return -ENFILE
; /* Not exactly a match, but its the
1432 closest posix thing */
1437 #ifdef CONFIG_MODULES
1438 /* Attempt to load a protocol module if the find failed.
1440 * 12/09/1996 Marcin: But! this makes REALLY only sense, if the user
1441 * requested real, full-featured networking support upon configuration.
1442 * Otherwise module support will break!
1444 if (rcu_access_pointer(net_families
[family
]) == NULL
)
1445 request_module("net-pf-%d", family
);
1449 pf
= rcu_dereference(net_families
[family
]);
1450 err
= -EAFNOSUPPORT
;
1455 * We will call the ->create function, that possibly is in a loadable
1456 * module, so we have to bump that loadable module refcnt first.
1458 if (!try_module_get(pf
->owner
))
1461 /* Now protected by module ref count */
1464 err
= pf
->create(net
, sock
, protocol
, kern
);
1466 goto out_module_put
;
1469 * Now to bump the refcnt of the [loadable] module that owns this
1470 * socket at sock_release time we decrement its refcnt.
1472 if (!try_module_get(sock
->ops
->owner
))
1473 goto out_module_busy
;
1476 * Now that we're done with the ->create function, the [loadable]
1477 * module can have its refcnt decremented
1479 module_put(pf
->owner
);
1480 err
= security_socket_post_create(sock
, family
, type
, protocol
, kern
);
1482 goto out_sock_release
;
1488 err
= -EAFNOSUPPORT
;
1491 module_put(pf
->owner
);
1498 goto out_sock_release
;
1500 EXPORT_SYMBOL(__sock_create
);
1503 * sock_create - creates a socket
1504 * @family: protocol family (AF_INET, ...)
1505 * @type: communication type (SOCK_STREAM, ...)
1506 * @protocol: protocol (0, ...)
1509 * A wrapper around __sock_create().
1510 * Returns 0 or an error. This function internally uses GFP_KERNEL.
1513 int sock_create(int family
, int type
, int protocol
, struct socket
**res
)
1515 return __sock_create(current
->nsproxy
->net_ns
, family
, type
, protocol
, res
, 0);
1517 EXPORT_SYMBOL(sock_create
);
1520 * sock_create_kern - creates a socket (kernel space)
1521 * @net: net namespace
1522 * @family: protocol family (AF_INET, ...)
1523 * @type: communication type (SOCK_STREAM, ...)
1524 * @protocol: protocol (0, ...)
1527 * A wrapper around __sock_create().
1528 * Returns 0 or an error. This function internally uses GFP_KERNEL.
1531 int sock_create_kern(struct net
*net
, int family
, int type
, int protocol
, struct socket
**res
)
1533 return __sock_create(net
, family
, type
, protocol
, res
, 1);
1535 EXPORT_SYMBOL(sock_create_kern
);
1537 int __sys_socket(int family
, int type
, int protocol
)
1540 struct socket
*sock
;
1543 /* Check the SOCK_* constants for consistency. */
1544 BUILD_BUG_ON(SOCK_CLOEXEC
!= O_CLOEXEC
);
1545 BUILD_BUG_ON((SOCK_MAX
| SOCK_TYPE_MASK
) != SOCK_TYPE_MASK
);
1546 BUILD_BUG_ON(SOCK_CLOEXEC
& SOCK_TYPE_MASK
);
1547 BUILD_BUG_ON(SOCK_NONBLOCK
& SOCK_TYPE_MASK
);
1549 flags
= type
& ~SOCK_TYPE_MASK
;
1550 if (flags
& ~(SOCK_CLOEXEC
| SOCK_NONBLOCK
))
1552 type
&= SOCK_TYPE_MASK
;
1554 if (SOCK_NONBLOCK
!= O_NONBLOCK
&& (flags
& SOCK_NONBLOCK
))
1555 flags
= (flags
& ~SOCK_NONBLOCK
) | O_NONBLOCK
;
1557 retval
= sock_create(family
, type
, protocol
, &sock
);
1561 return sock_map_fd(sock
, flags
& (O_CLOEXEC
| O_NONBLOCK
));
1564 SYSCALL_DEFINE3(socket
, int, family
, int, type
, int, protocol
)
1566 return __sys_socket(family
, type
, protocol
);
1570 * Create a pair of connected sockets.
1573 int __sys_socketpair(int family
, int type
, int protocol
, int __user
*usockvec
)
1575 struct socket
*sock1
, *sock2
;
1577 struct file
*newfile1
, *newfile2
;
1580 flags
= type
& ~SOCK_TYPE_MASK
;
1581 if (flags
& ~(SOCK_CLOEXEC
| SOCK_NONBLOCK
))
1583 type
&= SOCK_TYPE_MASK
;
1585 if (SOCK_NONBLOCK
!= O_NONBLOCK
&& (flags
& SOCK_NONBLOCK
))
1586 flags
= (flags
& ~SOCK_NONBLOCK
) | O_NONBLOCK
;
1589 * reserve descriptors and make sure we won't fail
1590 * to return them to userland.
1592 fd1
= get_unused_fd_flags(flags
);
1593 if (unlikely(fd1
< 0))
1596 fd2
= get_unused_fd_flags(flags
);
1597 if (unlikely(fd2
< 0)) {
1602 err
= put_user(fd1
, &usockvec
[0]);
1606 err
= put_user(fd2
, &usockvec
[1]);
1611 * Obtain the first socket and check if the underlying protocol
1612 * supports the socketpair call.
1615 err
= sock_create(family
, type
, protocol
, &sock1
);
1616 if (unlikely(err
< 0))
1619 err
= sock_create(family
, type
, protocol
, &sock2
);
1620 if (unlikely(err
< 0)) {
1621 sock_release(sock1
);
1625 err
= security_socket_socketpair(sock1
, sock2
);
1626 if (unlikely(err
)) {
1627 sock_release(sock2
);
1628 sock_release(sock1
);
1632 err
= sock1
->ops
->socketpair(sock1
, sock2
);
1633 if (unlikely(err
< 0)) {
1634 sock_release(sock2
);
1635 sock_release(sock1
);
1639 newfile1
= sock_alloc_file(sock1
, flags
, NULL
);
1640 if (IS_ERR(newfile1
)) {
1641 err
= PTR_ERR(newfile1
);
1642 sock_release(sock2
);
1646 newfile2
= sock_alloc_file(sock2
, flags
, NULL
);
1647 if (IS_ERR(newfile2
)) {
1648 err
= PTR_ERR(newfile2
);
1653 audit_fd_pair(fd1
, fd2
);
1655 fd_install(fd1
, newfile1
);
1656 fd_install(fd2
, newfile2
);
1665 SYSCALL_DEFINE4(socketpair
, int, family
, int, type
, int, protocol
,
1666 int __user
*, usockvec
)
1668 return __sys_socketpair(family
, type
, protocol
, usockvec
);
1672 * Bind a name to a socket. Nothing much to do here since it's
1673 * the protocol's responsibility to handle the local address.
1675 * We move the socket address to kernel space before we call
1676 * the protocol layer (having also checked the address is ok).
1679 int __sys_bind(int fd
, struct sockaddr __user
*umyaddr
, int addrlen
)
1681 struct socket
*sock
;
1682 struct sockaddr_storage address
;
1683 int err
, fput_needed
;
1685 sock
= sockfd_lookup_light(fd
, &err
, &fput_needed
);
1687 err
= move_addr_to_kernel(umyaddr
, addrlen
, &address
);
1689 err
= security_socket_bind(sock
,
1690 (struct sockaddr
*)&address
,
1693 err
= sock
->ops
->bind(sock
,
1697 fput_light(sock
->file
, fput_needed
);
1702 SYSCALL_DEFINE3(bind
, int, fd
, struct sockaddr __user
*, umyaddr
, int, addrlen
)
1704 return __sys_bind(fd
, umyaddr
, addrlen
);
1708 * Perform a listen. Basically, we allow the protocol to do anything
1709 * necessary for a listen, and if that works, we mark the socket as
1710 * ready for listening.
1713 int __sys_listen(int fd
, int backlog
)
1715 struct socket
*sock
;
1716 int err
, fput_needed
;
1719 sock
= sockfd_lookup_light(fd
, &err
, &fput_needed
);
1721 somaxconn
= sock_net(sock
->sk
)->core
.sysctl_somaxconn
;
1722 if ((unsigned int)backlog
> somaxconn
)
1723 backlog
= somaxconn
;
1725 err
= security_socket_listen(sock
, backlog
);
1727 err
= sock
->ops
->listen(sock
, backlog
);
1729 fput_light(sock
->file
, fput_needed
);
1734 SYSCALL_DEFINE2(listen
, int, fd
, int, backlog
)
1736 return __sys_listen(fd
, backlog
);
1739 struct file
*do_accept(struct file
*file
, unsigned file_flags
,
1740 struct sockaddr __user
*upeer_sockaddr
,
1741 int __user
*upeer_addrlen
, int flags
)
1743 struct socket
*sock
, *newsock
;
1744 struct file
*newfile
;
1746 struct sockaddr_storage address
;
1748 sock
= sock_from_file(file
);
1750 return ERR_PTR(-ENOTSOCK
);
1752 newsock
= sock_alloc();
1754 return ERR_PTR(-ENFILE
);
1756 newsock
->type
= sock
->type
;
1757 newsock
->ops
= sock
->ops
;
1760 * We don't need try_module_get here, as the listening socket (sock)
1761 * has the protocol module (sock->ops->owner) held.
1763 __module_get(newsock
->ops
->owner
);
1765 newfile
= sock_alloc_file(newsock
, flags
, sock
->sk
->sk_prot_creator
->name
);
1766 if (IS_ERR(newfile
))
1769 err
= security_socket_accept(sock
, newsock
);
1773 err
= sock
->ops
->accept(sock
, newsock
, sock
->file
->f_flags
| file_flags
,
1778 if (upeer_sockaddr
) {
1779 len
= newsock
->ops
->getname(newsock
,
1780 (struct sockaddr
*)&address
, 2);
1782 err
= -ECONNABORTED
;
1785 err
= move_addr_to_user(&address
,
1786 len
, upeer_sockaddr
, upeer_addrlen
);
1791 /* File flags are not inherited via accept() unlike another OSes. */
1795 return ERR_PTR(err
);
1798 int __sys_accept4_file(struct file
*file
, unsigned file_flags
,
1799 struct sockaddr __user
*upeer_sockaddr
,
1800 int __user
*upeer_addrlen
, int flags
,
1801 unsigned long nofile
)
1803 struct file
*newfile
;
1806 if (flags
& ~(SOCK_CLOEXEC
| SOCK_NONBLOCK
))
1809 if (SOCK_NONBLOCK
!= O_NONBLOCK
&& (flags
& SOCK_NONBLOCK
))
1810 flags
= (flags
& ~SOCK_NONBLOCK
) | O_NONBLOCK
;
1812 newfd
= __get_unused_fd_flags(flags
, nofile
);
1813 if (unlikely(newfd
< 0))
1816 newfile
= do_accept(file
, file_flags
, upeer_sockaddr
, upeer_addrlen
,
1818 if (IS_ERR(newfile
)) {
1819 put_unused_fd(newfd
);
1820 return PTR_ERR(newfile
);
1822 fd_install(newfd
, newfile
);
1827 * For accept, we attempt to create a new socket, set up the link
1828 * with the client, wake up the client, then return the new
1829 * connected fd. We collect the address of the connector in kernel
1830 * space and move it to user at the very end. This is unclean because
1831 * we open the socket then return an error.
1833 * 1003.1g adds the ability to recvmsg() to query connection pending
1834 * status to recvmsg. We need to add that support in a way thats
1835 * clean when we restructure accept also.
1838 int __sys_accept4(int fd
, struct sockaddr __user
*upeer_sockaddr
,
1839 int __user
*upeer_addrlen
, int flags
)
1846 ret
= __sys_accept4_file(f
.file
, 0, upeer_sockaddr
,
1847 upeer_addrlen
, flags
,
1848 rlimit(RLIMIT_NOFILE
));
1855 SYSCALL_DEFINE4(accept4
, int, fd
, struct sockaddr __user
*, upeer_sockaddr
,
1856 int __user
*, upeer_addrlen
, int, flags
)
1858 return __sys_accept4(fd
, upeer_sockaddr
, upeer_addrlen
, flags
);
1861 SYSCALL_DEFINE3(accept
, int, fd
, struct sockaddr __user
*, upeer_sockaddr
,
1862 int __user
*, upeer_addrlen
)
1864 return __sys_accept4(fd
, upeer_sockaddr
, upeer_addrlen
, 0);
1868 * Attempt to connect to a socket with the server address. The address
1869 * is in user space so we verify it is OK and move it to kernel space.
1871 * For 1003.1g we need to add clean support for a bind to AF_UNSPEC to
1874 * NOTE: 1003.1g draft 6.3 is broken with respect to AX.25/NetROM and
1875 * other SEQPACKET protocols that take time to connect() as it doesn't
1876 * include the -EINPROGRESS status for such sockets.
1879 int __sys_connect_file(struct file
*file
, struct sockaddr_storage
*address
,
1880 int addrlen
, int file_flags
)
1882 struct socket
*sock
;
1885 sock
= sock_from_file(file
);
1892 security_socket_connect(sock
, (struct sockaddr
*)address
, addrlen
);
1896 err
= sock
->ops
->connect(sock
, (struct sockaddr
*)address
, addrlen
,
1897 sock
->file
->f_flags
| file_flags
);
1902 int __sys_connect(int fd
, struct sockaddr __user
*uservaddr
, int addrlen
)
1909 struct sockaddr_storage address
;
1911 ret
= move_addr_to_kernel(uservaddr
, addrlen
, &address
);
1913 ret
= __sys_connect_file(f
.file
, &address
, addrlen
, 0);
1920 SYSCALL_DEFINE3(connect
, int, fd
, struct sockaddr __user
*, uservaddr
,
1923 return __sys_connect(fd
, uservaddr
, addrlen
);
1927 * Get the local address ('name') of a socket object. Move the obtained
1928 * name to user space.
1931 int __sys_getsockname(int fd
, struct sockaddr __user
*usockaddr
,
1932 int __user
*usockaddr_len
)
1934 struct socket
*sock
;
1935 struct sockaddr_storage address
;
1936 int err
, fput_needed
;
1938 sock
= sockfd_lookup_light(fd
, &err
, &fput_needed
);
1942 err
= security_socket_getsockname(sock
);
1946 err
= sock
->ops
->getname(sock
, (struct sockaddr
*)&address
, 0);
1949 /* "err" is actually length in this case */
1950 err
= move_addr_to_user(&address
, err
, usockaddr
, usockaddr_len
);
1953 fput_light(sock
->file
, fput_needed
);
1958 SYSCALL_DEFINE3(getsockname
, int, fd
, struct sockaddr __user
*, usockaddr
,
1959 int __user
*, usockaddr_len
)
1961 return __sys_getsockname(fd
, usockaddr
, usockaddr_len
);
1965 * Get the remote address ('name') of a socket object. Move the obtained
1966 * name to user space.
1969 int __sys_getpeername(int fd
, struct sockaddr __user
*usockaddr
,
1970 int __user
*usockaddr_len
)
1972 struct socket
*sock
;
1973 struct sockaddr_storage address
;
1974 int err
, fput_needed
;
1976 sock
= sockfd_lookup_light(fd
, &err
, &fput_needed
);
1978 err
= security_socket_getpeername(sock
);
1980 fput_light(sock
->file
, fput_needed
);
1984 err
= sock
->ops
->getname(sock
, (struct sockaddr
*)&address
, 1);
1986 /* "err" is actually length in this case */
1987 err
= move_addr_to_user(&address
, err
, usockaddr
,
1989 fput_light(sock
->file
, fput_needed
);
1994 SYSCALL_DEFINE3(getpeername
, int, fd
, struct sockaddr __user
*, usockaddr
,
1995 int __user
*, usockaddr_len
)
1997 return __sys_getpeername(fd
, usockaddr
, usockaddr_len
);
2001 * Send a datagram to a given address. We move the address into kernel
2002 * space and check the user space data area is readable before invoking
2005 int __sys_sendto(int fd
, void __user
*buff
, size_t len
, unsigned int flags
,
2006 struct sockaddr __user
*addr
, int addr_len
)
2008 struct socket
*sock
;
2009 struct sockaddr_storage address
;
2015 err
= import_single_range(WRITE
, buff
, len
, &iov
, &msg
.msg_iter
);
2018 sock
= sockfd_lookup_light(fd
, &err
, &fput_needed
);
2022 msg
.msg_name
= NULL
;
2023 msg
.msg_control
= NULL
;
2024 msg
.msg_controllen
= 0;
2025 msg
.msg_namelen
= 0;
2027 err
= move_addr_to_kernel(addr
, addr_len
, &address
);
2030 msg
.msg_name
= (struct sockaddr
*)&address
;
2031 msg
.msg_namelen
= addr_len
;
2033 if (sock
->file
->f_flags
& O_NONBLOCK
)
2034 flags
|= MSG_DONTWAIT
;
2035 msg
.msg_flags
= flags
;
2036 err
= sock_sendmsg(sock
, &msg
);
2039 fput_light(sock
->file
, fput_needed
);
2044 SYSCALL_DEFINE6(sendto
, int, fd
, void __user
*, buff
, size_t, len
,
2045 unsigned int, flags
, struct sockaddr __user
*, addr
,
2048 return __sys_sendto(fd
, buff
, len
, flags
, addr
, addr_len
);
2052 * Send a datagram down a socket.
2055 SYSCALL_DEFINE4(send
, int, fd
, void __user
*, buff
, size_t, len
,
2056 unsigned int, flags
)
2058 return __sys_sendto(fd
, buff
, len
, flags
, NULL
, 0);
2062 * Receive a frame from the socket and optionally record the address of the
2063 * sender. We verify the buffers are writable and if needed move the
2064 * sender address from kernel to user space.
2066 int __sys_recvfrom(int fd
, void __user
*ubuf
, size_t size
, unsigned int flags
,
2067 struct sockaddr __user
*addr
, int __user
*addr_len
)
2069 struct socket
*sock
;
2072 struct sockaddr_storage address
;
2076 err
= import_single_range(READ
, ubuf
, size
, &iov
, &msg
.msg_iter
);
2079 sock
= sockfd_lookup_light(fd
, &err
, &fput_needed
);
2083 msg
.msg_control
= NULL
;
2084 msg
.msg_controllen
= 0;
2085 /* Save some cycles and don't copy the address if not needed */
2086 msg
.msg_name
= addr
? (struct sockaddr
*)&address
: NULL
;
2087 /* We assume all kernel code knows the size of sockaddr_storage */
2088 msg
.msg_namelen
= 0;
2089 msg
.msg_iocb
= NULL
;
2091 if (sock
->file
->f_flags
& O_NONBLOCK
)
2092 flags
|= MSG_DONTWAIT
;
2093 err
= sock_recvmsg(sock
, &msg
, flags
);
2095 if (err
>= 0 && addr
!= NULL
) {
2096 err2
= move_addr_to_user(&address
,
2097 msg
.msg_namelen
, addr
, addr_len
);
2102 fput_light(sock
->file
, fput_needed
);
2107 SYSCALL_DEFINE6(recvfrom
, int, fd
, void __user
*, ubuf
, size_t, size
,
2108 unsigned int, flags
, struct sockaddr __user
*, addr
,
2109 int __user
*, addr_len
)
2111 return __sys_recvfrom(fd
, ubuf
, size
, flags
, addr
, addr_len
);
2115 * Receive a datagram from a socket.
2118 SYSCALL_DEFINE4(recv
, int, fd
, void __user
*, ubuf
, size_t, size
,
2119 unsigned int, flags
)
2121 return __sys_recvfrom(fd
, ubuf
, size
, flags
, NULL
, NULL
);
2124 static bool sock_use_custom_sol_socket(const struct socket
*sock
)
2126 const struct sock
*sk
= sock
->sk
;
2128 /* Use sock->ops->setsockopt() for MPTCP */
2129 return IS_ENABLED(CONFIG_MPTCP
) &&
2130 sk
->sk_protocol
== IPPROTO_MPTCP
&&
2131 sk
->sk_type
== SOCK_STREAM
&&
2132 (sk
->sk_family
== AF_INET
|| sk
->sk_family
== AF_INET6
);
2136 * Set a socket option. Because we don't know the option lengths we have
2137 * to pass the user mode parameter for the protocols to sort out.
2139 int __sys_setsockopt(int fd
, int level
, int optname
, char __user
*user_optval
,
2142 sockptr_t optval
= USER_SOCKPTR(user_optval
);
2143 char *kernel_optval
= NULL
;
2144 int err
, fput_needed
;
2145 struct socket
*sock
;
2150 sock
= sockfd_lookup_light(fd
, &err
, &fput_needed
);
2154 err
= security_socket_setsockopt(sock
, level
, optname
);
2158 if (!in_compat_syscall())
2159 err
= BPF_CGROUP_RUN_PROG_SETSOCKOPT(sock
->sk
, &level
, &optname
,
2160 user_optval
, &optlen
,
2170 optval
= KERNEL_SOCKPTR(kernel_optval
);
2171 if (level
== SOL_SOCKET
&& !sock_use_custom_sol_socket(sock
))
2172 err
= sock_setsockopt(sock
, level
, optname
, optval
, optlen
);
2173 else if (unlikely(!sock
->ops
->setsockopt
))
2176 err
= sock
->ops
->setsockopt(sock
, level
, optname
, optval
,
2178 kfree(kernel_optval
);
2180 fput_light(sock
->file
, fput_needed
);
2184 SYSCALL_DEFINE5(setsockopt
, int, fd
, int, level
, int, optname
,
2185 char __user
*, optval
, int, optlen
)
2187 return __sys_setsockopt(fd
, level
, optname
, optval
, optlen
);
2190 INDIRECT_CALLABLE_DECLARE(bool tcp_bpf_bypass_getsockopt(int level
,
2194 * Get a socket option. Because we don't know the option lengths we have
2195 * to pass a user mode parameter for the protocols to sort out.
2197 int __sys_getsockopt(int fd
, int level
, int optname
, char __user
*optval
,
2200 int err
, fput_needed
;
2201 struct socket
*sock
;
2204 sock
= sockfd_lookup_light(fd
, &err
, &fput_needed
);
2208 err
= security_socket_getsockopt(sock
, level
, optname
);
2212 if (!in_compat_syscall())
2213 max_optlen
= BPF_CGROUP_GETSOCKOPT_MAX_OPTLEN(optlen
);
2215 if (level
== SOL_SOCKET
)
2216 err
= sock_getsockopt(sock
, level
, optname
, optval
, optlen
);
2217 else if (unlikely(!sock
->ops
->getsockopt
))
2220 err
= sock
->ops
->getsockopt(sock
, level
, optname
, optval
,
2223 if (!in_compat_syscall())
2224 err
= BPF_CGROUP_RUN_PROG_GETSOCKOPT(sock
->sk
, level
, optname
,
2225 optval
, optlen
, max_optlen
,
2228 fput_light(sock
->file
, fput_needed
);
2232 SYSCALL_DEFINE5(getsockopt
, int, fd
, int, level
, int, optname
,
2233 char __user
*, optval
, int __user
*, optlen
)
2235 return __sys_getsockopt(fd
, level
, optname
, optval
, optlen
);
2239 * Shutdown a socket.
2242 int __sys_shutdown_sock(struct socket
*sock
, int how
)
2246 err
= security_socket_shutdown(sock
, how
);
2248 err
= sock
->ops
->shutdown(sock
, how
);
2253 int __sys_shutdown(int fd
, int how
)
2255 int err
, fput_needed
;
2256 struct socket
*sock
;
2258 sock
= sockfd_lookup_light(fd
, &err
, &fput_needed
);
2260 err
= __sys_shutdown_sock(sock
, how
);
2261 fput_light(sock
->file
, fput_needed
);
2266 SYSCALL_DEFINE2(shutdown
, int, fd
, int, how
)
2268 return __sys_shutdown(fd
, how
);
2271 /* A couple of helpful macros for getting the address of the 32/64 bit
2272 * fields which are the same type (int / unsigned) on our platforms.
2274 #define COMPAT_MSG(msg, member) ((MSG_CMSG_COMPAT & flags) ? &msg##_compat->member : &msg->member)
2275 #define COMPAT_NAMELEN(msg) COMPAT_MSG(msg, msg_namelen)
2276 #define COMPAT_FLAGS(msg) COMPAT_MSG(msg, msg_flags)
2278 struct used_address
{
2279 struct sockaddr_storage name
;
2280 unsigned int name_len
;
2283 int __copy_msghdr_from_user(struct msghdr
*kmsg
,
2284 struct user_msghdr __user
*umsg
,
2285 struct sockaddr __user
**save_addr
,
2286 struct iovec __user
**uiov
, size_t *nsegs
)
2288 struct user_msghdr msg
;
2291 if (copy_from_user(&msg
, umsg
, sizeof(*umsg
)))
2294 kmsg
->msg_control_is_user
= true;
2295 kmsg
->msg_control_user
= msg
.msg_control
;
2296 kmsg
->msg_controllen
= msg
.msg_controllen
;
2297 kmsg
->msg_flags
= msg
.msg_flags
;
2299 kmsg
->msg_namelen
= msg
.msg_namelen
;
2301 kmsg
->msg_namelen
= 0;
2303 if (kmsg
->msg_namelen
< 0)
2306 if (kmsg
->msg_namelen
> sizeof(struct sockaddr_storage
))
2307 kmsg
->msg_namelen
= sizeof(struct sockaddr_storage
);
2310 *save_addr
= msg
.msg_name
;
2312 if (msg
.msg_name
&& kmsg
->msg_namelen
) {
2314 err
= move_addr_to_kernel(msg
.msg_name
,
2321 kmsg
->msg_name
= NULL
;
2322 kmsg
->msg_namelen
= 0;
2325 if (msg
.msg_iovlen
> UIO_MAXIOV
)
2328 kmsg
->msg_iocb
= NULL
;
2329 *uiov
= msg
.msg_iov
;
2330 *nsegs
= msg
.msg_iovlen
;
2334 static int copy_msghdr_from_user(struct msghdr
*kmsg
,
2335 struct user_msghdr __user
*umsg
,
2336 struct sockaddr __user
**save_addr
,
2339 struct user_msghdr msg
;
2342 err
= __copy_msghdr_from_user(kmsg
, umsg
, save_addr
, &msg
.msg_iov
,
2347 err
= import_iovec(save_addr
? READ
: WRITE
,
2348 msg
.msg_iov
, msg
.msg_iovlen
,
2349 UIO_FASTIOV
, iov
, &kmsg
->msg_iter
);
2350 return err
< 0 ? err
: 0;
2353 static int ____sys_sendmsg(struct socket
*sock
, struct msghdr
*msg_sys
,
2354 unsigned int flags
, struct used_address
*used_address
,
2355 unsigned int allowed_msghdr_flags
)
2357 unsigned char ctl
[sizeof(struct cmsghdr
) + 20]
2358 __aligned(sizeof(__kernel_size_t
));
2359 /* 20 is size of ipv6_pktinfo */
2360 unsigned char *ctl_buf
= ctl
;
2366 if (msg_sys
->msg_controllen
> INT_MAX
)
2368 flags
|= (msg_sys
->msg_flags
& allowed_msghdr_flags
);
2369 ctl_len
= msg_sys
->msg_controllen
;
2370 if ((MSG_CMSG_COMPAT
& flags
) && ctl_len
) {
2372 cmsghdr_from_user_compat_to_kern(msg_sys
, sock
->sk
, ctl
,
2376 ctl_buf
= msg_sys
->msg_control
;
2377 ctl_len
= msg_sys
->msg_controllen
;
2378 } else if (ctl_len
) {
2379 BUILD_BUG_ON(sizeof(struct cmsghdr
) !=
2380 CMSG_ALIGN(sizeof(struct cmsghdr
)));
2381 if (ctl_len
> sizeof(ctl
)) {
2382 ctl_buf
= sock_kmalloc(sock
->sk
, ctl_len
, GFP_KERNEL
);
2383 if (ctl_buf
== NULL
)
2387 if (copy_from_user(ctl_buf
, msg_sys
->msg_control_user
, ctl_len
))
2389 msg_sys
->msg_control
= ctl_buf
;
2390 msg_sys
->msg_control_is_user
= false;
2392 msg_sys
->msg_flags
= flags
;
2394 if (sock
->file
->f_flags
& O_NONBLOCK
)
2395 msg_sys
->msg_flags
|= MSG_DONTWAIT
;
2397 * If this is sendmmsg() and current destination address is same as
2398 * previously succeeded address, omit asking LSM's decision.
2399 * used_address->name_len is initialized to UINT_MAX so that the first
2400 * destination address never matches.
2402 if (used_address
&& msg_sys
->msg_name
&&
2403 used_address
->name_len
== msg_sys
->msg_namelen
&&
2404 !memcmp(&used_address
->name
, msg_sys
->msg_name
,
2405 used_address
->name_len
)) {
2406 err
= sock_sendmsg_nosec(sock
, msg_sys
);
2409 err
= sock_sendmsg(sock
, msg_sys
);
2411 * If this is sendmmsg() and sending to current destination address was
2412 * successful, remember it.
2414 if (used_address
&& err
>= 0) {
2415 used_address
->name_len
= msg_sys
->msg_namelen
;
2416 if (msg_sys
->msg_name
)
2417 memcpy(&used_address
->name
, msg_sys
->msg_name
,
2418 used_address
->name_len
);
2423 sock_kfree_s(sock
->sk
, ctl_buf
, ctl_len
);
2428 int sendmsg_copy_msghdr(struct msghdr
*msg
,
2429 struct user_msghdr __user
*umsg
, unsigned flags
,
2434 if (flags
& MSG_CMSG_COMPAT
) {
2435 struct compat_msghdr __user
*msg_compat
;
2437 msg_compat
= (struct compat_msghdr __user
*) umsg
;
2438 err
= get_compat_msghdr(msg
, msg_compat
, NULL
, iov
);
2440 err
= copy_msghdr_from_user(msg
, umsg
, NULL
, iov
);
2448 static int ___sys_sendmsg(struct socket
*sock
, struct user_msghdr __user
*msg
,
2449 struct msghdr
*msg_sys
, unsigned int flags
,
2450 struct used_address
*used_address
,
2451 unsigned int allowed_msghdr_flags
)
2453 struct sockaddr_storage address
;
2454 struct iovec iovstack
[UIO_FASTIOV
], *iov
= iovstack
;
2457 msg_sys
->msg_name
= &address
;
2459 err
= sendmsg_copy_msghdr(msg_sys
, msg
, flags
, &iov
);
2463 err
= ____sys_sendmsg(sock
, msg_sys
, flags
, used_address
,
2464 allowed_msghdr_flags
);
2470 * BSD sendmsg interface
2472 long __sys_sendmsg_sock(struct socket
*sock
, struct msghdr
*msg
,
2475 return ____sys_sendmsg(sock
, msg
, flags
, NULL
, 0);
2478 long __sys_sendmsg(int fd
, struct user_msghdr __user
*msg
, unsigned int flags
,
2479 bool forbid_cmsg_compat
)
2481 int fput_needed
, err
;
2482 struct msghdr msg_sys
;
2483 struct socket
*sock
;
2485 if (forbid_cmsg_compat
&& (flags
& MSG_CMSG_COMPAT
))
2488 sock
= sockfd_lookup_light(fd
, &err
, &fput_needed
);
2492 err
= ___sys_sendmsg(sock
, msg
, &msg_sys
, flags
, NULL
, 0);
2494 fput_light(sock
->file
, fput_needed
);
2499 SYSCALL_DEFINE3(sendmsg
, int, fd
, struct user_msghdr __user
*, msg
, unsigned int, flags
)
2501 return __sys_sendmsg(fd
, msg
, flags
, true);
2505 * Linux sendmmsg interface
2508 int __sys_sendmmsg(int fd
, struct mmsghdr __user
*mmsg
, unsigned int vlen
,
2509 unsigned int flags
, bool forbid_cmsg_compat
)
2511 int fput_needed
, err
, datagrams
;
2512 struct socket
*sock
;
2513 struct mmsghdr __user
*entry
;
2514 struct compat_mmsghdr __user
*compat_entry
;
2515 struct msghdr msg_sys
;
2516 struct used_address used_address
;
2517 unsigned int oflags
= flags
;
2519 if (forbid_cmsg_compat
&& (flags
& MSG_CMSG_COMPAT
))
2522 if (vlen
> UIO_MAXIOV
)
2527 sock
= sockfd_lookup_light(fd
, &err
, &fput_needed
);
2531 used_address
.name_len
= UINT_MAX
;
2533 compat_entry
= (struct compat_mmsghdr __user
*)mmsg
;
2537 while (datagrams
< vlen
) {
2538 if (datagrams
== vlen
- 1)
2541 if (MSG_CMSG_COMPAT
& flags
) {
2542 err
= ___sys_sendmsg(sock
, (struct user_msghdr __user
*)compat_entry
,
2543 &msg_sys
, flags
, &used_address
, MSG_EOR
);
2546 err
= __put_user(err
, &compat_entry
->msg_len
);
2549 err
= ___sys_sendmsg(sock
,
2550 (struct user_msghdr __user
*)entry
,
2551 &msg_sys
, flags
, &used_address
, MSG_EOR
);
2554 err
= put_user(err
, &entry
->msg_len
);
2561 if (msg_data_left(&msg_sys
))
2566 fput_light(sock
->file
, fput_needed
);
2568 /* We only return an error if no datagrams were able to be sent */
2575 SYSCALL_DEFINE4(sendmmsg
, int, fd
, struct mmsghdr __user
*, mmsg
,
2576 unsigned int, vlen
, unsigned int, flags
)
2578 return __sys_sendmmsg(fd
, mmsg
, vlen
, flags
, true);
2581 int recvmsg_copy_msghdr(struct msghdr
*msg
,
2582 struct user_msghdr __user
*umsg
, unsigned flags
,
2583 struct sockaddr __user
**uaddr
,
2588 if (MSG_CMSG_COMPAT
& flags
) {
2589 struct compat_msghdr __user
*msg_compat
;
2591 msg_compat
= (struct compat_msghdr __user
*) umsg
;
2592 err
= get_compat_msghdr(msg
, msg_compat
, uaddr
, iov
);
2594 err
= copy_msghdr_from_user(msg
, umsg
, uaddr
, iov
);
2602 static int ____sys_recvmsg(struct socket
*sock
, struct msghdr
*msg_sys
,
2603 struct user_msghdr __user
*msg
,
2604 struct sockaddr __user
*uaddr
,
2605 unsigned int flags
, int nosec
)
2607 struct compat_msghdr __user
*msg_compat
=
2608 (struct compat_msghdr __user
*) msg
;
2609 int __user
*uaddr_len
= COMPAT_NAMELEN(msg
);
2610 struct sockaddr_storage addr
;
2611 unsigned long cmsg_ptr
;
2615 msg_sys
->msg_name
= &addr
;
2616 cmsg_ptr
= (unsigned long)msg_sys
->msg_control
;
2617 msg_sys
->msg_flags
= flags
& (MSG_CMSG_CLOEXEC
|MSG_CMSG_COMPAT
);
2619 /* We assume all kernel code knows the size of sockaddr_storage */
2620 msg_sys
->msg_namelen
= 0;
2622 if (sock
->file
->f_flags
& O_NONBLOCK
)
2623 flags
|= MSG_DONTWAIT
;
2625 if (unlikely(nosec
))
2626 err
= sock_recvmsg_nosec(sock
, msg_sys
, flags
);
2628 err
= sock_recvmsg(sock
, msg_sys
, flags
);
2634 if (uaddr
!= NULL
) {
2635 err
= move_addr_to_user(&addr
,
2636 msg_sys
->msg_namelen
, uaddr
,
2641 err
= __put_user((msg_sys
->msg_flags
& ~MSG_CMSG_COMPAT
),
2645 if (MSG_CMSG_COMPAT
& flags
)
2646 err
= __put_user((unsigned long)msg_sys
->msg_control
- cmsg_ptr
,
2647 &msg_compat
->msg_controllen
);
2649 err
= __put_user((unsigned long)msg_sys
->msg_control
- cmsg_ptr
,
2650 &msg
->msg_controllen
);
2658 static int ___sys_recvmsg(struct socket
*sock
, struct user_msghdr __user
*msg
,
2659 struct msghdr
*msg_sys
, unsigned int flags
, int nosec
)
2661 struct iovec iovstack
[UIO_FASTIOV
], *iov
= iovstack
;
2662 /* user mode address pointers */
2663 struct sockaddr __user
*uaddr
;
2666 err
= recvmsg_copy_msghdr(msg_sys
, msg
, flags
, &uaddr
, &iov
);
2670 err
= ____sys_recvmsg(sock
, msg_sys
, msg
, uaddr
, flags
, nosec
);
2676 * BSD recvmsg interface
2679 long __sys_recvmsg_sock(struct socket
*sock
, struct msghdr
*msg
,
2680 struct user_msghdr __user
*umsg
,
2681 struct sockaddr __user
*uaddr
, unsigned int flags
)
2683 return ____sys_recvmsg(sock
, msg
, umsg
, uaddr
, flags
, 0);
2686 long __sys_recvmsg(int fd
, struct user_msghdr __user
*msg
, unsigned int flags
,
2687 bool forbid_cmsg_compat
)
2689 int fput_needed
, err
;
2690 struct msghdr msg_sys
;
2691 struct socket
*sock
;
2693 if (forbid_cmsg_compat
&& (flags
& MSG_CMSG_COMPAT
))
2696 sock
= sockfd_lookup_light(fd
, &err
, &fput_needed
);
2700 err
= ___sys_recvmsg(sock
, msg
, &msg_sys
, flags
, 0);
2702 fput_light(sock
->file
, fput_needed
);
2707 SYSCALL_DEFINE3(recvmsg
, int, fd
, struct user_msghdr __user
*, msg
,
2708 unsigned int, flags
)
2710 return __sys_recvmsg(fd
, msg
, flags
, true);
2714 * Linux recvmmsg interface
2717 static int do_recvmmsg(int fd
, struct mmsghdr __user
*mmsg
,
2718 unsigned int vlen
, unsigned int flags
,
2719 struct timespec64
*timeout
)
2721 int fput_needed
, err
, datagrams
;
2722 struct socket
*sock
;
2723 struct mmsghdr __user
*entry
;
2724 struct compat_mmsghdr __user
*compat_entry
;
2725 struct msghdr msg_sys
;
2726 struct timespec64 end_time
;
2727 struct timespec64 timeout64
;
2730 poll_select_set_timeout(&end_time
, timeout
->tv_sec
,
2736 sock
= sockfd_lookup_light(fd
, &err
, &fput_needed
);
2740 if (likely(!(flags
& MSG_ERRQUEUE
))) {
2741 err
= sock_error(sock
->sk
);
2749 compat_entry
= (struct compat_mmsghdr __user
*)mmsg
;
2751 while (datagrams
< vlen
) {
2753 * No need to ask LSM for more than the first datagram.
2755 if (MSG_CMSG_COMPAT
& flags
) {
2756 err
= ___sys_recvmsg(sock
, (struct user_msghdr __user
*)compat_entry
,
2757 &msg_sys
, flags
& ~MSG_WAITFORONE
,
2761 err
= __put_user(err
, &compat_entry
->msg_len
);
2764 err
= ___sys_recvmsg(sock
,
2765 (struct user_msghdr __user
*)entry
,
2766 &msg_sys
, flags
& ~MSG_WAITFORONE
,
2770 err
= put_user(err
, &entry
->msg_len
);
2778 /* MSG_WAITFORONE turns on MSG_DONTWAIT after one packet */
2779 if (flags
& MSG_WAITFORONE
)
2780 flags
|= MSG_DONTWAIT
;
2783 ktime_get_ts64(&timeout64
);
2784 *timeout
= timespec64_sub(end_time
, timeout64
);
2785 if (timeout
->tv_sec
< 0) {
2786 timeout
->tv_sec
= timeout
->tv_nsec
= 0;
2790 /* Timeout, return less than vlen datagrams */
2791 if (timeout
->tv_nsec
== 0 && timeout
->tv_sec
== 0)
2795 /* Out of band data, return right away */
2796 if (msg_sys
.msg_flags
& MSG_OOB
)
2804 if (datagrams
== 0) {
2810 * We may return less entries than requested (vlen) if the
2811 * sock is non block and there aren't enough datagrams...
2813 if (err
!= -EAGAIN
) {
2815 * ... or if recvmsg returns an error after we
2816 * received some datagrams, where we record the
2817 * error to return on the next call or if the
2818 * app asks about it using getsockopt(SO_ERROR).
2820 sock
->sk
->sk_err
= -err
;
2823 fput_light(sock
->file
, fput_needed
);
2828 int __sys_recvmmsg(int fd
, struct mmsghdr __user
*mmsg
,
2829 unsigned int vlen
, unsigned int flags
,
2830 struct __kernel_timespec __user
*timeout
,
2831 struct old_timespec32 __user
*timeout32
)
2834 struct timespec64 timeout_sys
;
2836 if (timeout
&& get_timespec64(&timeout_sys
, timeout
))
2839 if (timeout32
&& get_old_timespec32(&timeout_sys
, timeout32
))
2842 if (!timeout
&& !timeout32
)
2843 return do_recvmmsg(fd
, mmsg
, vlen
, flags
, NULL
);
2845 datagrams
= do_recvmmsg(fd
, mmsg
, vlen
, flags
, &timeout_sys
);
2850 if (timeout
&& put_timespec64(&timeout_sys
, timeout
))
2851 datagrams
= -EFAULT
;
2853 if (timeout32
&& put_old_timespec32(&timeout_sys
, timeout32
))
2854 datagrams
= -EFAULT
;
2859 SYSCALL_DEFINE5(recvmmsg
, int, fd
, struct mmsghdr __user
*, mmsg
,
2860 unsigned int, vlen
, unsigned int, flags
,
2861 struct __kernel_timespec __user
*, timeout
)
2863 if (flags
& MSG_CMSG_COMPAT
)
2866 return __sys_recvmmsg(fd
, mmsg
, vlen
, flags
, timeout
, NULL
);
2869 #ifdef CONFIG_COMPAT_32BIT_TIME
2870 SYSCALL_DEFINE5(recvmmsg_time32
, int, fd
, struct mmsghdr __user
*, mmsg
,
2871 unsigned int, vlen
, unsigned int, flags
,
2872 struct old_timespec32 __user
*, timeout
)
2874 if (flags
& MSG_CMSG_COMPAT
)
2877 return __sys_recvmmsg(fd
, mmsg
, vlen
, flags
, NULL
, timeout
);
2881 #ifdef __ARCH_WANT_SYS_SOCKETCALL
2882 /* Argument list sizes for sys_socketcall */
2883 #define AL(x) ((x) * sizeof(unsigned long))
2884 static const unsigned char nargs
[21] = {
2885 AL(0), AL(3), AL(3), AL(3), AL(2), AL(3),
2886 AL(3), AL(3), AL(4), AL(4), AL(4), AL(6),
2887 AL(6), AL(2), AL(5), AL(5), AL(3), AL(3),
2894 * System call vectors.
2896 * Argument checking cleaned up. Saved 20% in size.
2897 * This function doesn't need to set the kernel lock because
2898 * it is set by the callees.
2901 SYSCALL_DEFINE2(socketcall
, int, call
, unsigned long __user
*, args
)
2903 unsigned long a
[AUDITSC_ARGS
];
2904 unsigned long a0
, a1
;
2908 if (call
< 1 || call
> SYS_SENDMMSG
)
2910 call
= array_index_nospec(call
, SYS_SENDMMSG
+ 1);
2913 if (len
> sizeof(a
))
2916 /* copy_from_user should be SMP safe. */
2917 if (copy_from_user(a
, args
, len
))
2920 err
= audit_socketcall(nargs
[call
] / sizeof(unsigned long), a
);
2929 err
= __sys_socket(a0
, a1
, a
[2]);
2932 err
= __sys_bind(a0
, (struct sockaddr __user
*)a1
, a
[2]);
2935 err
= __sys_connect(a0
, (struct sockaddr __user
*)a1
, a
[2]);
2938 err
= __sys_listen(a0
, a1
);
2941 err
= __sys_accept4(a0
, (struct sockaddr __user
*)a1
,
2942 (int __user
*)a
[2], 0);
2944 case SYS_GETSOCKNAME
:
2946 __sys_getsockname(a0
, (struct sockaddr __user
*)a1
,
2947 (int __user
*)a
[2]);
2949 case SYS_GETPEERNAME
:
2951 __sys_getpeername(a0
, (struct sockaddr __user
*)a1
,
2952 (int __user
*)a
[2]);
2954 case SYS_SOCKETPAIR
:
2955 err
= __sys_socketpair(a0
, a1
, a
[2], (int __user
*)a
[3]);
2958 err
= __sys_sendto(a0
, (void __user
*)a1
, a
[2], a
[3],
2962 err
= __sys_sendto(a0
, (void __user
*)a1
, a
[2], a
[3],
2963 (struct sockaddr __user
*)a
[4], a
[5]);
2966 err
= __sys_recvfrom(a0
, (void __user
*)a1
, a
[2], a
[3],
2970 err
= __sys_recvfrom(a0
, (void __user
*)a1
, a
[2], a
[3],
2971 (struct sockaddr __user
*)a
[4],
2972 (int __user
*)a
[5]);
2975 err
= __sys_shutdown(a0
, a1
);
2977 case SYS_SETSOCKOPT
:
2978 err
= __sys_setsockopt(a0
, a1
, a
[2], (char __user
*)a
[3],
2981 case SYS_GETSOCKOPT
:
2983 __sys_getsockopt(a0
, a1
, a
[2], (char __user
*)a
[3],
2984 (int __user
*)a
[4]);
2987 err
= __sys_sendmsg(a0
, (struct user_msghdr __user
*)a1
,
2991 err
= __sys_sendmmsg(a0
, (struct mmsghdr __user
*)a1
, a
[2],
2995 err
= __sys_recvmsg(a0
, (struct user_msghdr __user
*)a1
,
2999 if (IS_ENABLED(CONFIG_64BIT
))
3000 err
= __sys_recvmmsg(a0
, (struct mmsghdr __user
*)a1
,
3002 (struct __kernel_timespec __user
*)a
[4],
3005 err
= __sys_recvmmsg(a0
, (struct mmsghdr __user
*)a1
,
3007 (struct old_timespec32 __user
*)a
[4]);
3010 err
= __sys_accept4(a0
, (struct sockaddr __user
*)a1
,
3011 (int __user
*)a
[2], a
[3]);
3020 #endif /* __ARCH_WANT_SYS_SOCKETCALL */
3023 * sock_register - add a socket protocol handler
3024 * @ops: description of protocol
3026 * This function is called by a protocol handler that wants to
3027 * advertise its address family, and have it linked into the
3028 * socket interface. The value ops->family corresponds to the
3029 * socket system call protocol family.
3031 int sock_register(const struct net_proto_family
*ops
)
3035 if (ops
->family
>= NPROTO
) {
3036 pr_crit("protocol %d >= NPROTO(%d)\n", ops
->family
, NPROTO
);
3040 spin_lock(&net_family_lock
);
3041 if (rcu_dereference_protected(net_families
[ops
->family
],
3042 lockdep_is_held(&net_family_lock
)))
3045 rcu_assign_pointer(net_families
[ops
->family
], ops
);
3048 spin_unlock(&net_family_lock
);
3050 pr_info("NET: Registered %s protocol family\n", pf_family_names
[ops
->family
]);
3053 EXPORT_SYMBOL(sock_register
);
3056 * sock_unregister - remove a protocol handler
3057 * @family: protocol family to remove
3059 * This function is called by a protocol handler that wants to
3060 * remove its address family, and have it unlinked from the
3061 * new socket creation.
3063 * If protocol handler is a module, then it can use module reference
3064 * counts to protect against new references. If protocol handler is not
3065 * a module then it needs to provide its own protection in
3066 * the ops->create routine.
3068 void sock_unregister(int family
)
3070 BUG_ON(family
< 0 || family
>= NPROTO
);
3072 spin_lock(&net_family_lock
);
3073 RCU_INIT_POINTER(net_families
[family
], NULL
);
3074 spin_unlock(&net_family_lock
);
3078 pr_info("NET: Unregistered %s protocol family\n", pf_family_names
[family
]);
3080 EXPORT_SYMBOL(sock_unregister
);
3082 bool sock_is_registered(int family
)
3084 return family
< NPROTO
&& rcu_access_pointer(net_families
[family
]);
3087 static int __init
sock_init(void)
3091 * Initialize the network sysctl infrastructure.
3093 err
= net_sysctl_init();
3098 * Initialize skbuff SLAB cache
3103 * Initialize the protocols module.
3108 err
= register_filesystem(&sock_fs_type
);
3111 sock_mnt
= kern_mount(&sock_fs_type
);
3112 if (IS_ERR(sock_mnt
)) {
3113 err
= PTR_ERR(sock_mnt
);
3117 /* The real protocol initialization is performed in later initcalls.
3120 #ifdef CONFIG_NETFILTER
3121 err
= netfilter_init();
3126 ptp_classifier_init();
3132 unregister_filesystem(&sock_fs_type
);
3136 core_initcall(sock_init
); /* early initcall */
3138 #ifdef CONFIG_PROC_FS
3139 void socket_seq_show(struct seq_file
*seq
)
3141 seq_printf(seq
, "sockets: used %d\n",
3142 sock_inuse_get(seq
->private));
3144 #endif /* CONFIG_PROC_FS */
3146 /* Handle the fact that while struct ifreq has the same *layout* on
3147 * 32/64 for everything but ifreq::ifru_ifmap and ifreq::ifru_data,
3148 * which are handled elsewhere, it still has different *size* due to
3149 * ifreq::ifru_ifmap (which is 16 bytes on 32 bit, 24 bytes on 64-bit,
3150 * resulting in struct ifreq being 32 and 40 bytes respectively).
3151 * As a result, if the struct happens to be at the end of a page and
3152 * the next page isn't readable/writable, we get a fault. To prevent
3153 * that, copy back and forth to the full size.
3155 int get_user_ifreq(struct ifreq
*ifr
, void __user
**ifrdata
, void __user
*arg
)
3157 if (in_compat_syscall()) {
3158 struct compat_ifreq
*ifr32
= (struct compat_ifreq
*)ifr
;
3160 memset(ifr
, 0, sizeof(*ifr
));
3161 if (copy_from_user(ifr32
, arg
, sizeof(*ifr32
)))
3165 *ifrdata
= compat_ptr(ifr32
->ifr_data
);
3170 if (copy_from_user(ifr
, arg
, sizeof(*ifr
)))
3174 *ifrdata
= ifr
->ifr_data
;
3178 EXPORT_SYMBOL(get_user_ifreq
);
3180 int put_user_ifreq(struct ifreq
*ifr
, void __user
*arg
)
3182 size_t size
= sizeof(*ifr
);
3184 if (in_compat_syscall())
3185 size
= sizeof(struct compat_ifreq
);
3187 if (copy_to_user(arg
, ifr
, size
))
3192 EXPORT_SYMBOL(put_user_ifreq
);
3194 #ifdef CONFIG_COMPAT
3195 static int compat_siocwandev(struct net
*net
, struct compat_ifreq __user
*uifr32
)
3197 compat_uptr_t uptr32
;
3202 if (get_user_ifreq(&ifr
, NULL
, uifr32
))
3205 if (get_user(uptr32
, &uifr32
->ifr_settings
.ifs_ifsu
))
3208 saved
= ifr
.ifr_settings
.ifs_ifsu
.raw_hdlc
;
3209 ifr
.ifr_settings
.ifs_ifsu
.raw_hdlc
= compat_ptr(uptr32
);
3211 err
= dev_ioctl(net
, SIOCWANDEV
, &ifr
, NULL
, NULL
);
3213 ifr
.ifr_settings
.ifs_ifsu
.raw_hdlc
= saved
;
3214 if (put_user_ifreq(&ifr
, uifr32
))
3220 /* Handle ioctls that use ifreq::ifr_data and just need struct ifreq converted */
3221 static int compat_ifr_data_ioctl(struct net
*net
, unsigned int cmd
,
3222 struct compat_ifreq __user
*u_ifreq32
)
3227 if (!is_socket_ioctl_cmd(cmd
))
3229 if (get_user_ifreq(&ifreq
, &data
, u_ifreq32
))
3231 ifreq
.ifr_data
= data
;
3233 return dev_ioctl(net
, cmd
, &ifreq
, data
, NULL
);
3236 /* Since old style bridge ioctl's endup using SIOCDEVPRIVATE
3237 * for some operations; this forces use of the newer bridge-utils that
3238 * use compatible ioctls
3240 static int old_bridge_ioctl(compat_ulong_t __user
*argp
)
3244 if (get_user(tmp
, argp
))
3246 if (tmp
== BRCTL_GET_VERSION
)
3247 return BRCTL_VERSION
+ 1;
3251 static int compat_sock_ioctl_trans(struct file
*file
, struct socket
*sock
,
3252 unsigned int cmd
, unsigned long arg
)
3254 void __user
*argp
= compat_ptr(arg
);
3255 struct sock
*sk
= sock
->sk
;
3256 struct net
*net
= sock_net(sk
);
3258 if (cmd
>= SIOCDEVPRIVATE
&& cmd
<= (SIOCDEVPRIVATE
+ 15))
3259 return sock_ioctl(file
, cmd
, (unsigned long)argp
);
3264 return old_bridge_ioctl(argp
);
3266 return compat_siocwandev(net
, argp
);
3267 case SIOCGSTAMP_OLD
:
3268 case SIOCGSTAMPNS_OLD
:
3269 if (!sock
->ops
->gettstamp
)
3270 return -ENOIOCTLCMD
;
3271 return sock
->ops
->gettstamp(sock
, argp
, cmd
== SIOCGSTAMP_OLD
,
3272 !COMPAT_USE_64BIT_TIME
);
3275 case SIOCBONDSLAVEINFOQUERY
:
3276 case SIOCBONDINFOQUERY
:
3279 return compat_ifr_data_ioctl(net
, cmd
, argp
);
3290 case SIOCGSTAMP_NEW
:
3291 case SIOCGSTAMPNS_NEW
:
3293 return sock_ioctl(file
, cmd
, arg
);
3312 case SIOCSIFHWBROADCAST
:
3314 case SIOCGIFBRDADDR
:
3315 case SIOCSIFBRDADDR
:
3316 case SIOCGIFDSTADDR
:
3317 case SIOCSIFDSTADDR
:
3318 case SIOCGIFNETMASK
:
3319 case SIOCSIFNETMASK
:
3331 case SIOCBONDENSLAVE
:
3332 case SIOCBONDRELEASE
:
3333 case SIOCBONDSETHWADDR
:
3334 case SIOCBONDCHANGEACTIVE
:
3341 return sock_do_ioctl(net
, sock
, cmd
, arg
);
3344 return -ENOIOCTLCMD
;
3347 static long compat_sock_ioctl(struct file
*file
, unsigned int cmd
,
3350 struct socket
*sock
= file
->private_data
;
3351 int ret
= -ENOIOCTLCMD
;
3358 if (sock
->ops
->compat_ioctl
)
3359 ret
= sock
->ops
->compat_ioctl(sock
, cmd
, arg
);
3361 if (ret
== -ENOIOCTLCMD
&&
3362 (cmd
>= SIOCIWFIRST
&& cmd
<= SIOCIWLAST
))
3363 ret
= compat_wext_handle_ioctl(net
, cmd
, arg
);
3365 if (ret
== -ENOIOCTLCMD
)
3366 ret
= compat_sock_ioctl_trans(file
, sock
, cmd
, arg
);
3373 * kernel_bind - bind an address to a socket (kernel space)
3376 * @addrlen: length of address
3378 * Returns 0 or an error.
3381 int kernel_bind(struct socket
*sock
, struct sockaddr
*addr
, int addrlen
)
3383 return sock
->ops
->bind(sock
, addr
, addrlen
);
3385 EXPORT_SYMBOL(kernel_bind
);
3388 * kernel_listen - move socket to listening state (kernel space)
3390 * @backlog: pending connections queue size
3392 * Returns 0 or an error.
3395 int kernel_listen(struct socket
*sock
, int backlog
)
3397 return sock
->ops
->listen(sock
, backlog
);
3399 EXPORT_SYMBOL(kernel_listen
);
3402 * kernel_accept - accept a connection (kernel space)
3403 * @sock: listening socket
3404 * @newsock: new connected socket
3407 * @flags must be SOCK_CLOEXEC, SOCK_NONBLOCK or 0.
3408 * If it fails, @newsock is guaranteed to be %NULL.
3409 * Returns 0 or an error.
3412 int kernel_accept(struct socket
*sock
, struct socket
**newsock
, int flags
)
3414 struct sock
*sk
= sock
->sk
;
3417 err
= sock_create_lite(sk
->sk_family
, sk
->sk_type
, sk
->sk_protocol
,
3422 err
= sock
->ops
->accept(sock
, *newsock
, flags
, true);
3424 sock_release(*newsock
);
3429 (*newsock
)->ops
= sock
->ops
;
3430 __module_get((*newsock
)->ops
->owner
);
3435 EXPORT_SYMBOL(kernel_accept
);
3438 * kernel_connect - connect a socket (kernel space)
3441 * @addrlen: address length
3442 * @flags: flags (O_NONBLOCK, ...)
3444 * For datagram sockets, @addr is the address to which datagrams are sent
3445 * by default, and the only address from which datagrams are received.
3446 * For stream sockets, attempts to connect to @addr.
3447 * Returns 0 or an error code.
3450 int kernel_connect(struct socket
*sock
, struct sockaddr
*addr
, int addrlen
,
3453 return sock
->ops
->connect(sock
, addr
, addrlen
, flags
);
3455 EXPORT_SYMBOL(kernel_connect
);
3458 * kernel_getsockname - get the address which the socket is bound (kernel space)
3460 * @addr: address holder
3462 * Fills the @addr pointer with the address which the socket is bound.
3463 * Returns 0 or an error code.
3466 int kernel_getsockname(struct socket
*sock
, struct sockaddr
*addr
)
3468 return sock
->ops
->getname(sock
, addr
, 0);
3470 EXPORT_SYMBOL(kernel_getsockname
);
3473 * kernel_getpeername - get the address which the socket is connected (kernel space)
3475 * @addr: address holder
3477 * Fills the @addr pointer with the address which the socket is connected.
3478 * Returns 0 or an error code.
3481 int kernel_getpeername(struct socket
*sock
, struct sockaddr
*addr
)
3483 return sock
->ops
->getname(sock
, addr
, 1);
3485 EXPORT_SYMBOL(kernel_getpeername
);
3488 * kernel_sendpage - send a &page through a socket (kernel space)
3491 * @offset: page offset
3492 * @size: total size in bytes
3493 * @flags: flags (MSG_DONTWAIT, ...)
3495 * Returns the total amount sent in bytes or an error.
3498 int kernel_sendpage(struct socket
*sock
, struct page
*page
, int offset
,
3499 size_t size
, int flags
)
3501 if (sock
->ops
->sendpage
) {
3502 /* Warn in case the improper page to zero-copy send */
3503 WARN_ONCE(!sendpage_ok(page
), "improper page for zero-copy send");
3504 return sock
->ops
->sendpage(sock
, page
, offset
, size
, flags
);
3506 return sock_no_sendpage(sock
, page
, offset
, size
, flags
);
3508 EXPORT_SYMBOL(kernel_sendpage
);
3511 * kernel_sendpage_locked - send a &page through the locked sock (kernel space)
3514 * @offset: page offset
3515 * @size: total size in bytes
3516 * @flags: flags (MSG_DONTWAIT, ...)
3518 * Returns the total amount sent in bytes or an error.
3519 * Caller must hold @sk.
3522 int kernel_sendpage_locked(struct sock
*sk
, struct page
*page
, int offset
,
3523 size_t size
, int flags
)
3525 struct socket
*sock
= sk
->sk_socket
;
3527 if (sock
->ops
->sendpage_locked
)
3528 return sock
->ops
->sendpage_locked(sk
, page
, offset
, size
,
3531 return sock_no_sendpage_locked(sk
, page
, offset
, size
, flags
);
3533 EXPORT_SYMBOL(kernel_sendpage_locked
);
3536 * kernel_sock_shutdown - shut down part of a full-duplex connection (kernel space)
3538 * @how: connection part
3540 * Returns 0 or an error.
3543 int kernel_sock_shutdown(struct socket
*sock
, enum sock_shutdown_cmd how
)
3545 return sock
->ops
->shutdown(sock
, how
);
3547 EXPORT_SYMBOL(kernel_sock_shutdown
);
3550 * kernel_sock_ip_overhead - returns the IP overhead imposed by a socket
3553 * This routine returns the IP overhead imposed by a socket i.e.
3554 * the length of the underlying IP header, depending on whether
3555 * this is an IPv4 or IPv6 socket and the length from IP options turned
3556 * on at the socket. Assumes that the caller has a lock on the socket.
3559 u32
kernel_sock_ip_overhead(struct sock
*sk
)
3561 struct inet_sock
*inet
;
3562 struct ip_options_rcu
*opt
;
3564 #if IS_ENABLED(CONFIG_IPV6)
3565 struct ipv6_pinfo
*np
;
3566 struct ipv6_txoptions
*optv6
= NULL
;
3567 #endif /* IS_ENABLED(CONFIG_IPV6) */
3572 switch (sk
->sk_family
) {
3575 overhead
+= sizeof(struct iphdr
);
3576 opt
= rcu_dereference_protected(inet
->inet_opt
,
3577 sock_owned_by_user(sk
));
3579 overhead
+= opt
->opt
.optlen
;
3581 #if IS_ENABLED(CONFIG_IPV6)
3584 overhead
+= sizeof(struct ipv6hdr
);
3586 optv6
= rcu_dereference_protected(np
->opt
,
3587 sock_owned_by_user(sk
));
3589 overhead
+= (optv6
->opt_flen
+ optv6
->opt_nflen
);
3591 #endif /* IS_ENABLED(CONFIG_IPV6) */
3592 default: /* Returns 0 overhead if the socket is not ipv4 or ipv6 */
3596 EXPORT_SYMBOL(kernel_sock_ip_overhead
);