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>
108 #ifdef CONFIG_NET_RX_BUSY_POLL
109 unsigned int sysctl_net_busy_read __read_mostly
;
110 unsigned int sysctl_net_busy_poll __read_mostly
;
113 static ssize_t
sock_read_iter(struct kiocb
*iocb
, struct iov_iter
*to
);
114 static ssize_t
sock_write_iter(struct kiocb
*iocb
, struct iov_iter
*from
);
115 static int sock_mmap(struct file
*file
, struct vm_area_struct
*vma
);
117 static int sock_close(struct inode
*inode
, struct file
*file
);
118 static __poll_t
sock_poll(struct file
*file
,
119 struct poll_table_struct
*wait
);
120 static long sock_ioctl(struct file
*file
, unsigned int cmd
, unsigned long arg
);
122 static long compat_sock_ioctl(struct file
*file
,
123 unsigned int cmd
, unsigned long arg
);
125 static int sock_fasync(int fd
, struct file
*filp
, int on
);
126 static ssize_t
sock_sendpage(struct file
*file
, struct page
*page
,
127 int offset
, size_t size
, loff_t
*ppos
, int more
);
128 static ssize_t
sock_splice_read(struct file
*file
, loff_t
*ppos
,
129 struct pipe_inode_info
*pipe
, size_t len
,
132 #ifdef CONFIG_PROC_FS
133 static void sock_show_fdinfo(struct seq_file
*m
, struct file
*f
)
135 struct socket
*sock
= f
->private_data
;
137 if (sock
->ops
->show_fdinfo
)
138 sock
->ops
->show_fdinfo(m
, sock
);
141 #define sock_show_fdinfo NULL
145 * Socket files have a set of 'special' operations as well as the generic file ones. These don't appear
146 * in the operation structures but are done directly via the socketcall() multiplexor.
149 static const struct file_operations socket_file_ops
= {
150 .owner
= THIS_MODULE
,
152 .read_iter
= sock_read_iter
,
153 .write_iter
= sock_write_iter
,
155 .unlocked_ioctl
= sock_ioctl
,
157 .compat_ioctl
= compat_sock_ioctl
,
160 .release
= sock_close
,
161 .fasync
= sock_fasync
,
162 .sendpage
= sock_sendpage
,
163 .splice_write
= generic_splice_sendpage
,
164 .splice_read
= sock_splice_read
,
165 .show_fdinfo
= sock_show_fdinfo
,
168 static const char * const pf_family_names
[] = {
169 [PF_UNSPEC
] = "PF_UNSPEC",
170 [PF_UNIX
] = "PF_UNIX/PF_LOCAL",
171 [PF_INET
] = "PF_INET",
172 [PF_AX25
] = "PF_AX25",
174 [PF_APPLETALK
] = "PF_APPLETALK",
175 [PF_NETROM
] = "PF_NETROM",
176 [PF_BRIDGE
] = "PF_BRIDGE",
177 [PF_ATMPVC
] = "PF_ATMPVC",
179 [PF_INET6
] = "PF_INET6",
180 [PF_ROSE
] = "PF_ROSE",
181 [PF_DECnet
] = "PF_DECnet",
182 [PF_NETBEUI
] = "PF_NETBEUI",
183 [PF_SECURITY
] = "PF_SECURITY",
185 [PF_NETLINK
] = "PF_NETLINK/PF_ROUTE",
186 [PF_PACKET
] = "PF_PACKET",
188 [PF_ECONET
] = "PF_ECONET",
189 [PF_ATMSVC
] = "PF_ATMSVC",
192 [PF_IRDA
] = "PF_IRDA",
193 [PF_PPPOX
] = "PF_PPPOX",
194 [PF_WANPIPE
] = "PF_WANPIPE",
197 [PF_MPLS
] = "PF_MPLS",
199 [PF_TIPC
] = "PF_TIPC",
200 [PF_BLUETOOTH
] = "PF_BLUETOOTH",
201 [PF_IUCV
] = "PF_IUCV",
202 [PF_RXRPC
] = "PF_RXRPC",
203 [PF_ISDN
] = "PF_ISDN",
204 [PF_PHONET
] = "PF_PHONET",
205 [PF_IEEE802154
] = "PF_IEEE802154",
206 [PF_CAIF
] = "PF_CAIF",
209 [PF_VSOCK
] = "PF_VSOCK",
211 [PF_QIPCRTR
] = "PF_QIPCRTR",
217 * The protocol list. Each protocol is registered in here.
220 static DEFINE_SPINLOCK(net_family_lock
);
221 static const struct net_proto_family __rcu
*net_families
[NPROTO
] __read_mostly
;
225 * Move socket addresses back and forth across the kernel/user
226 * divide and look after the messy bits.
230 * move_addr_to_kernel - copy a socket address into kernel space
231 * @uaddr: Address in user space
232 * @kaddr: Address in kernel space
233 * @ulen: Length in user space
235 * The address is copied into kernel space. If the provided address is
236 * too long an error code of -EINVAL is returned. If the copy gives
237 * invalid addresses -EFAULT is returned. On a success 0 is returned.
240 int move_addr_to_kernel(void __user
*uaddr
, int ulen
, struct sockaddr_storage
*kaddr
)
242 if (ulen
< 0 || ulen
> sizeof(struct sockaddr_storage
))
246 if (copy_from_user(kaddr
, uaddr
, ulen
))
248 return audit_sockaddr(ulen
, kaddr
);
252 * move_addr_to_user - copy an address to user space
253 * @kaddr: kernel space address
254 * @klen: length of address in kernel
255 * @uaddr: user space address
256 * @ulen: pointer to user length field
258 * The value pointed to by ulen on entry is the buffer length available.
259 * This is overwritten with the buffer space used. -EINVAL is returned
260 * if an overlong buffer is specified or a negative buffer size. -EFAULT
261 * is returned if either the buffer or the length field are not
263 * After copying the data up to the limit the user specifies, the true
264 * length of the data is written over the length limit the user
265 * specified. Zero is returned for a success.
268 static int move_addr_to_user(struct sockaddr_storage
*kaddr
, int klen
,
269 void __user
*uaddr
, int __user
*ulen
)
274 BUG_ON(klen
> sizeof(struct sockaddr_storage
));
275 err
= get_user(len
, ulen
);
283 if (audit_sockaddr(klen
, kaddr
))
285 if (copy_to_user(uaddr
, kaddr
, len
))
289 * "fromlen shall refer to the value before truncation.."
292 return __put_user(klen
, ulen
);
295 static struct kmem_cache
*sock_inode_cachep __ro_after_init
;
297 static struct inode
*sock_alloc_inode(struct super_block
*sb
)
299 struct socket_alloc
*ei
;
301 ei
= kmem_cache_alloc(sock_inode_cachep
, GFP_KERNEL
);
304 init_waitqueue_head(&ei
->socket
.wq
.wait
);
305 ei
->socket
.wq
.fasync_list
= NULL
;
306 ei
->socket
.wq
.flags
= 0;
308 ei
->socket
.state
= SS_UNCONNECTED
;
309 ei
->socket
.flags
= 0;
310 ei
->socket
.ops
= NULL
;
311 ei
->socket
.sk
= NULL
;
312 ei
->socket
.file
= NULL
;
314 return &ei
->vfs_inode
;
317 static void sock_free_inode(struct inode
*inode
)
319 struct socket_alloc
*ei
;
321 ei
= container_of(inode
, struct socket_alloc
, vfs_inode
);
322 kmem_cache_free(sock_inode_cachep
, ei
);
325 static void init_once(void *foo
)
327 struct socket_alloc
*ei
= (struct socket_alloc
*)foo
;
329 inode_init_once(&ei
->vfs_inode
);
332 static void init_inodecache(void)
334 sock_inode_cachep
= kmem_cache_create("sock_inode_cache",
335 sizeof(struct socket_alloc
),
337 (SLAB_HWCACHE_ALIGN
|
338 SLAB_RECLAIM_ACCOUNT
|
339 SLAB_MEM_SPREAD
| SLAB_ACCOUNT
),
341 BUG_ON(sock_inode_cachep
== NULL
);
344 static const struct super_operations sockfs_ops
= {
345 .alloc_inode
= sock_alloc_inode
,
346 .free_inode
= sock_free_inode
,
347 .statfs
= simple_statfs
,
351 * sockfs_dname() is called from d_path().
353 static char *sockfs_dname(struct dentry
*dentry
, char *buffer
, int buflen
)
355 return dynamic_dname(dentry
, buffer
, buflen
, "socket:[%lu]",
356 d_inode(dentry
)->i_ino
);
359 static const struct dentry_operations sockfs_dentry_operations
= {
360 .d_dname
= sockfs_dname
,
363 static int sockfs_xattr_get(const struct xattr_handler
*handler
,
364 struct dentry
*dentry
, struct inode
*inode
,
365 const char *suffix
, void *value
, size_t size
)
368 if (dentry
->d_name
.len
+ 1 > size
)
370 memcpy(value
, dentry
->d_name
.name
, dentry
->d_name
.len
+ 1);
372 return dentry
->d_name
.len
+ 1;
375 #define XATTR_SOCKPROTONAME_SUFFIX "sockprotoname"
376 #define XATTR_NAME_SOCKPROTONAME (XATTR_SYSTEM_PREFIX XATTR_SOCKPROTONAME_SUFFIX)
377 #define XATTR_NAME_SOCKPROTONAME_LEN (sizeof(XATTR_NAME_SOCKPROTONAME)-1)
379 static const struct xattr_handler sockfs_xattr_handler
= {
380 .name
= XATTR_NAME_SOCKPROTONAME
,
381 .get
= sockfs_xattr_get
,
384 static int sockfs_security_xattr_set(const struct xattr_handler
*handler
,
385 struct user_namespace
*mnt_userns
,
386 struct dentry
*dentry
, struct inode
*inode
,
387 const char *suffix
, const void *value
,
388 size_t size
, int flags
)
390 /* Handled by LSM. */
394 static const struct xattr_handler sockfs_security_xattr_handler
= {
395 .prefix
= XATTR_SECURITY_PREFIX
,
396 .set
= sockfs_security_xattr_set
,
399 static const struct xattr_handler
*sockfs_xattr_handlers
[] = {
400 &sockfs_xattr_handler
,
401 &sockfs_security_xattr_handler
,
405 static int sockfs_init_fs_context(struct fs_context
*fc
)
407 struct pseudo_fs_context
*ctx
= init_pseudo(fc
, SOCKFS_MAGIC
);
410 ctx
->ops
= &sockfs_ops
;
411 ctx
->dops
= &sockfs_dentry_operations
;
412 ctx
->xattr
= sockfs_xattr_handlers
;
416 static struct vfsmount
*sock_mnt __read_mostly
;
418 static struct file_system_type sock_fs_type
= {
420 .init_fs_context
= sockfs_init_fs_context
,
421 .kill_sb
= kill_anon_super
,
425 * Obtains the first available file descriptor and sets it up for use.
427 * These functions create file structures and maps them to fd space
428 * of the current process. On success it returns file descriptor
429 * and file struct implicitly stored in sock->file.
430 * Note that another thread may close file descriptor before we return
431 * from this function. We use the fact that now we do not refer
432 * to socket after mapping. If one day we will need it, this
433 * function will increment ref. count on file by 1.
435 * In any case returned fd MAY BE not valid!
436 * This race condition is unavoidable
437 * with shared fd spaces, we cannot solve it inside kernel,
438 * but we take care of internal coherence yet.
442 * sock_alloc_file - Bind a &socket to a &file
444 * @flags: file status flags
445 * @dname: protocol name
447 * Returns the &file bound with @sock, implicitly storing it
448 * in sock->file. If dname is %NULL, sets to "".
449 * On failure the return is a ERR pointer (see linux/err.h).
450 * This function uses GFP_KERNEL internally.
453 struct file
*sock_alloc_file(struct socket
*sock
, int flags
, const char *dname
)
458 dname
= sock
->sk
? sock
->sk
->sk_prot_creator
->name
: "";
460 file
= alloc_file_pseudo(SOCK_INODE(sock
), sock_mnt
, dname
,
461 O_RDWR
| (flags
& O_NONBLOCK
),
469 file
->private_data
= sock
;
470 stream_open(SOCK_INODE(sock
), file
);
473 EXPORT_SYMBOL(sock_alloc_file
);
475 static int sock_map_fd(struct socket
*sock
, int flags
)
477 struct file
*newfile
;
478 int fd
= get_unused_fd_flags(flags
);
479 if (unlikely(fd
< 0)) {
484 newfile
= sock_alloc_file(sock
, flags
, NULL
);
485 if (!IS_ERR(newfile
)) {
486 fd_install(fd
, newfile
);
491 return PTR_ERR(newfile
);
495 * sock_from_file - Return the &socket bounded to @file.
498 * On failure returns %NULL.
501 struct socket
*sock_from_file(struct file
*file
)
503 if (file
->f_op
== &socket_file_ops
)
504 return file
->private_data
; /* set in sock_map_fd */
508 EXPORT_SYMBOL(sock_from_file
);
511 * sockfd_lookup - Go from a file number to its socket slot
513 * @err: pointer to an error code return
515 * The file handle passed in is locked and the socket it is bound
516 * to is returned. If an error occurs the err pointer is overwritten
517 * with a negative errno code and NULL is returned. The function checks
518 * for both invalid handles and passing a handle which is not a socket.
520 * On a success the socket object pointer is returned.
523 struct socket
*sockfd_lookup(int fd
, int *err
)
534 sock
= sock_from_file(file
);
541 EXPORT_SYMBOL(sockfd_lookup
);
543 static struct socket
*sockfd_lookup_light(int fd
, int *err
, int *fput_needed
)
545 struct fd f
= fdget(fd
);
550 sock
= sock_from_file(f
.file
);
552 *fput_needed
= f
.flags
& FDPUT_FPUT
;
561 static ssize_t
sockfs_listxattr(struct dentry
*dentry
, char *buffer
,
567 len
= security_inode_listsecurity(d_inode(dentry
), buffer
, size
);
577 len
= (XATTR_NAME_SOCKPROTONAME_LEN
+ 1);
582 memcpy(buffer
, XATTR_NAME_SOCKPROTONAME
, len
);
589 static int sockfs_setattr(struct user_namespace
*mnt_userns
,
590 struct dentry
*dentry
, struct iattr
*iattr
)
592 int err
= simple_setattr(&init_user_ns
, dentry
, iattr
);
594 if (!err
&& (iattr
->ia_valid
& ATTR_UID
)) {
595 struct socket
*sock
= SOCKET_I(d_inode(dentry
));
598 sock
->sk
->sk_uid
= iattr
->ia_uid
;
606 static const struct inode_operations sockfs_inode_ops
= {
607 .listxattr
= sockfs_listxattr
,
608 .setattr
= sockfs_setattr
,
612 * sock_alloc - allocate a socket
614 * Allocate a new inode and socket object. The two are bound together
615 * and initialised. The socket is then returned. If we are out of inodes
616 * NULL is returned. This functions uses GFP_KERNEL internally.
619 struct socket
*sock_alloc(void)
624 inode
= new_inode_pseudo(sock_mnt
->mnt_sb
);
628 sock
= SOCKET_I(inode
);
630 inode
->i_ino
= get_next_ino();
631 inode
->i_mode
= S_IFSOCK
| S_IRWXUGO
;
632 inode
->i_uid
= current_fsuid();
633 inode
->i_gid
= current_fsgid();
634 inode
->i_op
= &sockfs_inode_ops
;
638 EXPORT_SYMBOL(sock_alloc
);
640 static void __sock_release(struct socket
*sock
, struct inode
*inode
)
643 struct module
*owner
= sock
->ops
->owner
;
647 sock
->ops
->release(sock
);
655 if (sock
->wq
.fasync_list
)
656 pr_err("%s: fasync list not empty!\n", __func__
);
659 iput(SOCK_INODE(sock
));
666 * sock_release - close a socket
667 * @sock: socket to close
669 * The socket is released from the protocol stack if it has a release
670 * callback, and the inode is then released if the socket is bound to
671 * an inode not a file.
673 void sock_release(struct socket
*sock
)
675 __sock_release(sock
, NULL
);
677 EXPORT_SYMBOL(sock_release
);
679 void __sock_tx_timestamp(__u16 tsflags
, __u8
*tx_flags
)
681 u8 flags
= *tx_flags
;
683 if (tsflags
& SOF_TIMESTAMPING_TX_HARDWARE
)
684 flags
|= SKBTX_HW_TSTAMP
;
686 if (tsflags
& SOF_TIMESTAMPING_TX_SOFTWARE
)
687 flags
|= SKBTX_SW_TSTAMP
;
689 if (tsflags
& SOF_TIMESTAMPING_TX_SCHED
)
690 flags
|= SKBTX_SCHED_TSTAMP
;
694 EXPORT_SYMBOL(__sock_tx_timestamp
);
696 INDIRECT_CALLABLE_DECLARE(int inet_sendmsg(struct socket
*, struct msghdr
*,
698 INDIRECT_CALLABLE_DECLARE(int inet6_sendmsg(struct socket
*, struct msghdr
*,
700 static inline int sock_sendmsg_nosec(struct socket
*sock
, struct msghdr
*msg
)
702 int ret
= INDIRECT_CALL_INET(sock
->ops
->sendmsg
, inet6_sendmsg
,
703 inet_sendmsg
, sock
, msg
,
705 BUG_ON(ret
== -EIOCBQUEUED
);
710 * sock_sendmsg - send a message through @sock
712 * @msg: message to send
714 * Sends @msg through @sock, passing through LSM.
715 * Returns the number of bytes sent, or an error code.
717 int sock_sendmsg(struct socket
*sock
, struct msghdr
*msg
)
719 int err
= security_socket_sendmsg(sock
, msg
,
722 return err
?: sock_sendmsg_nosec(sock
, msg
);
724 EXPORT_SYMBOL(sock_sendmsg
);
727 * kernel_sendmsg - send a message through @sock (kernel-space)
729 * @msg: message header
731 * @num: vec array length
732 * @size: total message data size
734 * Builds the message data with @vec and sends it through @sock.
735 * Returns the number of bytes sent, or an error code.
738 int kernel_sendmsg(struct socket
*sock
, struct msghdr
*msg
,
739 struct kvec
*vec
, size_t num
, size_t size
)
741 iov_iter_kvec(&msg
->msg_iter
, WRITE
, vec
, num
, size
);
742 return sock_sendmsg(sock
, msg
);
744 EXPORT_SYMBOL(kernel_sendmsg
);
747 * kernel_sendmsg_locked - send a message through @sock (kernel-space)
749 * @msg: message header
750 * @vec: output s/g array
751 * @num: output s/g array length
752 * @size: total message data size
754 * Builds the message data with @vec and sends it through @sock.
755 * Returns the number of bytes sent, or an error code.
756 * Caller must hold @sk.
759 int kernel_sendmsg_locked(struct sock
*sk
, struct msghdr
*msg
,
760 struct kvec
*vec
, size_t num
, size_t size
)
762 struct socket
*sock
= sk
->sk_socket
;
764 if (!sock
->ops
->sendmsg_locked
)
765 return sock_no_sendmsg_locked(sk
, msg
, size
);
767 iov_iter_kvec(&msg
->msg_iter
, WRITE
, vec
, num
, size
);
769 return sock
->ops
->sendmsg_locked(sk
, msg
, msg_data_left(msg
));
771 EXPORT_SYMBOL(kernel_sendmsg_locked
);
773 static bool skb_is_err_queue(const struct sk_buff
*skb
)
775 /* pkt_type of skbs enqueued on the error queue are set to
776 * PACKET_OUTGOING in skb_set_err_queue(). This is only safe to do
777 * in recvmsg, since skbs received on a local socket will never
778 * have a pkt_type of PACKET_OUTGOING.
780 return skb
->pkt_type
== PACKET_OUTGOING
;
783 /* On transmit, software and hardware timestamps are returned independently.
784 * As the two skb clones share the hardware timestamp, which may be updated
785 * before the software timestamp is received, a hardware TX timestamp may be
786 * returned only if there is no software TX timestamp. Ignore false software
787 * timestamps, which may be made in the __sock_recv_timestamp() call when the
788 * option SO_TIMESTAMP_OLD(NS) is enabled on the socket, even when the skb has a
789 * hardware timestamp.
791 static bool skb_is_swtx_tstamp(const struct sk_buff
*skb
, int false_tstamp
)
793 return skb
->tstamp
&& !false_tstamp
&& skb_is_err_queue(skb
);
796 static void put_ts_pktinfo(struct msghdr
*msg
, struct sk_buff
*skb
)
798 struct scm_ts_pktinfo ts_pktinfo
;
799 struct net_device
*orig_dev
;
801 if (!skb_mac_header_was_set(skb
))
804 memset(&ts_pktinfo
, 0, sizeof(ts_pktinfo
));
807 orig_dev
= dev_get_by_napi_id(skb_napi_id(skb
));
809 ts_pktinfo
.if_index
= orig_dev
->ifindex
;
812 ts_pktinfo
.pkt_length
= skb
->len
- skb_mac_offset(skb
);
813 put_cmsg(msg
, SOL_SOCKET
, SCM_TIMESTAMPING_PKTINFO
,
814 sizeof(ts_pktinfo
), &ts_pktinfo
);
818 * called from sock_recv_timestamp() if sock_flag(sk, SOCK_RCVTSTAMP)
820 void __sock_recv_timestamp(struct msghdr
*msg
, struct sock
*sk
,
823 int need_software_tstamp
= sock_flag(sk
, SOCK_RCVTSTAMP
);
824 int new_tstamp
= sock_flag(sk
, SOCK_TSTAMP_NEW
);
825 struct scm_timestamping_internal tss
;
827 int empty
= 1, false_tstamp
= 0;
828 struct skb_shared_hwtstamps
*shhwtstamps
=
831 /* Race occurred between timestamp enabling and packet
832 receiving. Fill in the current time for now. */
833 if (need_software_tstamp
&& skb
->tstamp
== 0) {
834 __net_timestamp(skb
);
838 if (need_software_tstamp
) {
839 if (!sock_flag(sk
, SOCK_RCVTSTAMPNS
)) {
841 struct __kernel_sock_timeval tv
;
843 skb_get_new_timestamp(skb
, &tv
);
844 put_cmsg(msg
, SOL_SOCKET
, SO_TIMESTAMP_NEW
,
847 struct __kernel_old_timeval tv
;
849 skb_get_timestamp(skb
, &tv
);
850 put_cmsg(msg
, SOL_SOCKET
, SO_TIMESTAMP_OLD
,
855 struct __kernel_timespec ts
;
857 skb_get_new_timestampns(skb
, &ts
);
858 put_cmsg(msg
, SOL_SOCKET
, SO_TIMESTAMPNS_NEW
,
861 struct __kernel_old_timespec ts
;
863 skb_get_timestampns(skb
, &ts
);
864 put_cmsg(msg
, SOL_SOCKET
, SO_TIMESTAMPNS_OLD
,
870 memset(&tss
, 0, sizeof(tss
));
871 if ((sk
->sk_tsflags
& SOF_TIMESTAMPING_SOFTWARE
) &&
872 ktime_to_timespec64_cond(skb
->tstamp
, tss
.ts
+ 0))
875 (sk
->sk_tsflags
& SOF_TIMESTAMPING_RAW_HARDWARE
) &&
876 !skb_is_swtx_tstamp(skb
, false_tstamp
) &&
877 ktime_to_timespec64_cond(shhwtstamps
->hwtstamp
, tss
.ts
+ 2)) {
879 if ((sk
->sk_tsflags
& SOF_TIMESTAMPING_OPT_PKTINFO
) &&
880 !skb_is_err_queue(skb
))
881 put_ts_pktinfo(msg
, skb
);
884 if (sock_flag(sk
, SOCK_TSTAMP_NEW
))
885 put_cmsg_scm_timestamping64(msg
, &tss
);
887 put_cmsg_scm_timestamping(msg
, &tss
);
889 if (skb_is_err_queue(skb
) && skb
->len
&&
890 SKB_EXT_ERR(skb
)->opt_stats
)
891 put_cmsg(msg
, SOL_SOCKET
, SCM_TIMESTAMPING_OPT_STATS
,
892 skb
->len
, skb
->data
);
895 EXPORT_SYMBOL_GPL(__sock_recv_timestamp
);
897 void __sock_recv_wifi_status(struct msghdr
*msg
, struct sock
*sk
,
902 if (!sock_flag(sk
, SOCK_WIFI_STATUS
))
904 if (!skb
->wifi_acked_valid
)
907 ack
= skb
->wifi_acked
;
909 put_cmsg(msg
, SOL_SOCKET
, SCM_WIFI_STATUS
, sizeof(ack
), &ack
);
911 EXPORT_SYMBOL_GPL(__sock_recv_wifi_status
);
913 static inline void sock_recv_drops(struct msghdr
*msg
, struct sock
*sk
,
916 if (sock_flag(sk
, SOCK_RXQ_OVFL
) && skb
&& SOCK_SKB_CB(skb
)->dropcount
)
917 put_cmsg(msg
, SOL_SOCKET
, SO_RXQ_OVFL
,
918 sizeof(__u32
), &SOCK_SKB_CB(skb
)->dropcount
);
921 void __sock_recv_ts_and_drops(struct msghdr
*msg
, struct sock
*sk
,
924 sock_recv_timestamp(msg
, sk
, skb
);
925 sock_recv_drops(msg
, sk
, skb
);
927 EXPORT_SYMBOL_GPL(__sock_recv_ts_and_drops
);
929 INDIRECT_CALLABLE_DECLARE(int inet_recvmsg(struct socket
*, struct msghdr
*,
931 INDIRECT_CALLABLE_DECLARE(int inet6_recvmsg(struct socket
*, struct msghdr
*,
933 static inline int sock_recvmsg_nosec(struct socket
*sock
, struct msghdr
*msg
,
936 return INDIRECT_CALL_INET(sock
->ops
->recvmsg
, inet6_recvmsg
,
937 inet_recvmsg
, sock
, msg
, msg_data_left(msg
),
942 * sock_recvmsg - receive a message from @sock
944 * @msg: message to receive
945 * @flags: message flags
947 * Receives @msg from @sock, passing through LSM. Returns the total number
948 * of bytes received, or an error.
950 int sock_recvmsg(struct socket
*sock
, struct msghdr
*msg
, int flags
)
952 int err
= security_socket_recvmsg(sock
, msg
, msg_data_left(msg
), flags
);
954 return err
?: sock_recvmsg_nosec(sock
, msg
, flags
);
956 EXPORT_SYMBOL(sock_recvmsg
);
959 * kernel_recvmsg - Receive a message from a socket (kernel space)
960 * @sock: The socket to receive the message from
961 * @msg: Received message
962 * @vec: Input s/g array for message data
963 * @num: Size of input s/g array
964 * @size: Number of bytes to read
965 * @flags: Message flags (MSG_DONTWAIT, etc...)
967 * On return the msg structure contains the scatter/gather array passed in the
968 * vec argument. The array is modified so that it consists of the unfilled
969 * portion of the original array.
971 * The returned value is the total number of bytes received, or an error.
974 int kernel_recvmsg(struct socket
*sock
, struct msghdr
*msg
,
975 struct kvec
*vec
, size_t num
, size_t size
, int flags
)
977 msg
->msg_control_is_user
= false;
978 iov_iter_kvec(&msg
->msg_iter
, READ
, vec
, num
, size
);
979 return sock_recvmsg(sock
, msg
, flags
);
981 EXPORT_SYMBOL(kernel_recvmsg
);
983 static ssize_t
sock_sendpage(struct file
*file
, struct page
*page
,
984 int offset
, size_t size
, loff_t
*ppos
, int more
)
989 sock
= file
->private_data
;
991 flags
= (file
->f_flags
& O_NONBLOCK
) ? MSG_DONTWAIT
: 0;
992 /* more is a combination of MSG_MORE and MSG_SENDPAGE_NOTLAST */
995 return kernel_sendpage(sock
, page
, offset
, size
, flags
);
998 static ssize_t
sock_splice_read(struct file
*file
, loff_t
*ppos
,
999 struct pipe_inode_info
*pipe
, size_t len
,
1002 struct socket
*sock
= file
->private_data
;
1004 if (unlikely(!sock
->ops
->splice_read
))
1005 return generic_file_splice_read(file
, ppos
, pipe
, len
, flags
);
1007 return sock
->ops
->splice_read(sock
, ppos
, pipe
, len
, flags
);
1010 static ssize_t
sock_read_iter(struct kiocb
*iocb
, struct iov_iter
*to
)
1012 struct file
*file
= iocb
->ki_filp
;
1013 struct socket
*sock
= file
->private_data
;
1014 struct msghdr msg
= {.msg_iter
= *to
,
1018 if (file
->f_flags
& O_NONBLOCK
|| (iocb
->ki_flags
& IOCB_NOWAIT
))
1019 msg
.msg_flags
= MSG_DONTWAIT
;
1021 if (iocb
->ki_pos
!= 0)
1024 if (!iov_iter_count(to
)) /* Match SYS5 behaviour */
1027 res
= sock_recvmsg(sock
, &msg
, msg
.msg_flags
);
1032 static ssize_t
sock_write_iter(struct kiocb
*iocb
, struct iov_iter
*from
)
1034 struct file
*file
= iocb
->ki_filp
;
1035 struct socket
*sock
= file
->private_data
;
1036 struct msghdr msg
= {.msg_iter
= *from
,
1040 if (iocb
->ki_pos
!= 0)
1043 if (file
->f_flags
& O_NONBLOCK
|| (iocb
->ki_flags
& IOCB_NOWAIT
))
1044 msg
.msg_flags
= MSG_DONTWAIT
;
1046 if (sock
->type
== SOCK_SEQPACKET
)
1047 msg
.msg_flags
|= MSG_EOR
;
1049 res
= sock_sendmsg(sock
, &msg
);
1050 *from
= msg
.msg_iter
;
1055 * Atomic setting of ioctl hooks to avoid race
1056 * with module unload.
1059 static DEFINE_MUTEX(br_ioctl_mutex
);
1060 static int (*br_ioctl_hook
) (struct net
*, unsigned int cmd
, void __user
*arg
);
1062 void brioctl_set(int (*hook
) (struct net
*, unsigned int, void __user
*))
1064 mutex_lock(&br_ioctl_mutex
);
1065 br_ioctl_hook
= hook
;
1066 mutex_unlock(&br_ioctl_mutex
);
1068 EXPORT_SYMBOL(brioctl_set
);
1070 static DEFINE_MUTEX(vlan_ioctl_mutex
);
1071 static int (*vlan_ioctl_hook
) (struct net
*, void __user
*arg
);
1073 void vlan_ioctl_set(int (*hook
) (struct net
*, void __user
*))
1075 mutex_lock(&vlan_ioctl_mutex
);
1076 vlan_ioctl_hook
= hook
;
1077 mutex_unlock(&vlan_ioctl_mutex
);
1079 EXPORT_SYMBOL(vlan_ioctl_set
);
1081 static long sock_do_ioctl(struct net
*net
, struct socket
*sock
,
1082 unsigned int cmd
, unsigned long arg
)
1085 void __user
*argp
= (void __user
*)arg
;
1087 err
= sock
->ops
->ioctl(sock
, cmd
, arg
);
1090 * If this ioctl is unknown try to hand it down
1091 * to the NIC driver.
1093 if (err
!= -ENOIOCTLCMD
)
1096 if (cmd
== SIOCGIFCONF
) {
1098 if (copy_from_user(&ifc
, argp
, sizeof(struct ifconf
)))
1101 err
= dev_ifconf(net
, &ifc
, sizeof(struct ifreq
));
1103 if (!err
&& copy_to_user(argp
, &ifc
, sizeof(struct ifconf
)))
1108 if (copy_from_user(&ifr
, argp
, sizeof(struct ifreq
)))
1110 err
= dev_ioctl(net
, cmd
, &ifr
, &need_copyout
);
1111 if (!err
&& need_copyout
)
1112 if (copy_to_user(argp
, &ifr
, sizeof(struct ifreq
)))
1119 * With an ioctl, arg may well be a user mode pointer, but we don't know
1120 * what to do with it - that's up to the protocol still.
1123 static long sock_ioctl(struct file
*file
, unsigned cmd
, unsigned long arg
)
1125 struct socket
*sock
;
1127 void __user
*argp
= (void __user
*)arg
;
1131 sock
= file
->private_data
;
1134 if (unlikely(cmd
>= SIOCDEVPRIVATE
&& cmd
<= (SIOCDEVPRIVATE
+ 15))) {
1137 if (copy_from_user(&ifr
, argp
, sizeof(struct ifreq
)))
1139 err
= dev_ioctl(net
, cmd
, &ifr
, &need_copyout
);
1140 if (!err
&& need_copyout
)
1141 if (copy_to_user(argp
, &ifr
, sizeof(struct ifreq
)))
1144 #ifdef CONFIG_WEXT_CORE
1145 if (cmd
>= SIOCIWFIRST
&& cmd
<= SIOCIWLAST
) {
1146 err
= wext_handle_ioctl(net
, cmd
, argp
);
1153 if (get_user(pid
, (int __user
*)argp
))
1155 err
= f_setown(sock
->file
, pid
, 1);
1159 err
= put_user(f_getown(sock
->file
),
1160 (int __user
*)argp
);
1168 request_module("bridge");
1170 mutex_lock(&br_ioctl_mutex
);
1172 err
= br_ioctl_hook(net
, cmd
, argp
);
1173 mutex_unlock(&br_ioctl_mutex
);
1178 if (!vlan_ioctl_hook
)
1179 request_module("8021q");
1181 mutex_lock(&vlan_ioctl_mutex
);
1182 if (vlan_ioctl_hook
)
1183 err
= vlan_ioctl_hook(net
, argp
);
1184 mutex_unlock(&vlan_ioctl_mutex
);
1188 if (!ns_capable(net
->user_ns
, CAP_NET_ADMIN
))
1191 err
= open_related_ns(&net
->ns
, get_net_ns
);
1193 case SIOCGSTAMP_OLD
:
1194 case SIOCGSTAMPNS_OLD
:
1195 if (!sock
->ops
->gettstamp
) {
1199 err
= sock
->ops
->gettstamp(sock
, argp
,
1200 cmd
== SIOCGSTAMP_OLD
,
1201 !IS_ENABLED(CONFIG_64BIT
));
1203 case SIOCGSTAMP_NEW
:
1204 case SIOCGSTAMPNS_NEW
:
1205 if (!sock
->ops
->gettstamp
) {
1209 err
= sock
->ops
->gettstamp(sock
, argp
,
1210 cmd
== SIOCGSTAMP_NEW
,
1214 err
= sock_do_ioctl(net
, sock
, cmd
, arg
);
1221 * sock_create_lite - creates a socket
1222 * @family: protocol family (AF_INET, ...)
1223 * @type: communication type (SOCK_STREAM, ...)
1224 * @protocol: protocol (0, ...)
1227 * Creates a new socket and assigns it to @res, passing through LSM.
1228 * The new socket initialization is not complete, see kernel_accept().
1229 * Returns 0 or an error. On failure @res is set to %NULL.
1230 * This function internally uses GFP_KERNEL.
1233 int sock_create_lite(int family
, int type
, int protocol
, struct socket
**res
)
1236 struct socket
*sock
= NULL
;
1238 err
= security_socket_create(family
, type
, protocol
, 1);
1242 sock
= sock_alloc();
1249 err
= security_socket_post_create(sock
, family
, type
, protocol
, 1);
1261 EXPORT_SYMBOL(sock_create_lite
);
1263 /* No kernel lock held - perfect */
1264 static __poll_t
sock_poll(struct file
*file
, poll_table
*wait
)
1266 struct socket
*sock
= file
->private_data
;
1267 __poll_t events
= poll_requested_events(wait
), flag
= 0;
1269 if (!sock
->ops
->poll
)
1272 if (sk_can_busy_loop(sock
->sk
)) {
1273 /* poll once if requested by the syscall */
1274 if (events
& POLL_BUSY_LOOP
)
1275 sk_busy_loop(sock
->sk
, 1);
1277 /* if this socket can poll_ll, tell the system call */
1278 flag
= POLL_BUSY_LOOP
;
1281 return sock
->ops
->poll(file
, sock
, wait
) | flag
;
1284 static int sock_mmap(struct file
*file
, struct vm_area_struct
*vma
)
1286 struct socket
*sock
= file
->private_data
;
1288 return sock
->ops
->mmap(file
, sock
, vma
);
1291 static int sock_close(struct inode
*inode
, struct file
*filp
)
1293 __sock_release(SOCKET_I(inode
), inode
);
1298 * Update the socket async list
1300 * Fasync_list locking strategy.
1302 * 1. fasync_list is modified only under process context socket lock
1303 * i.e. under semaphore.
1304 * 2. fasync_list is used under read_lock(&sk->sk_callback_lock)
1305 * or under socket lock
1308 static int sock_fasync(int fd
, struct file
*filp
, int on
)
1310 struct socket
*sock
= filp
->private_data
;
1311 struct sock
*sk
= sock
->sk
;
1312 struct socket_wq
*wq
= &sock
->wq
;
1318 fasync_helper(fd
, filp
, on
, &wq
->fasync_list
);
1320 if (!wq
->fasync_list
)
1321 sock_reset_flag(sk
, SOCK_FASYNC
);
1323 sock_set_flag(sk
, SOCK_FASYNC
);
1329 /* This function may be called only under rcu_lock */
1331 int sock_wake_async(struct socket_wq
*wq
, int how
, int band
)
1333 if (!wq
|| !wq
->fasync_list
)
1337 case SOCK_WAKE_WAITD
:
1338 if (test_bit(SOCKWQ_ASYNC_WAITDATA
, &wq
->flags
))
1341 case SOCK_WAKE_SPACE
:
1342 if (!test_and_clear_bit(SOCKWQ_ASYNC_NOSPACE
, &wq
->flags
))
1347 kill_fasync(&wq
->fasync_list
, SIGIO
, band
);
1350 kill_fasync(&wq
->fasync_list
, SIGURG
, band
);
1355 EXPORT_SYMBOL(sock_wake_async
);
1358 * __sock_create - creates a socket
1359 * @net: net namespace
1360 * @family: protocol family (AF_INET, ...)
1361 * @type: communication type (SOCK_STREAM, ...)
1362 * @protocol: protocol (0, ...)
1364 * @kern: boolean for kernel space sockets
1366 * Creates a new socket and assigns it to @res, passing through LSM.
1367 * Returns 0 or an error. On failure @res is set to %NULL. @kern must
1368 * be set to true if the socket resides in kernel space.
1369 * This function internally uses GFP_KERNEL.
1372 int __sock_create(struct net
*net
, int family
, int type
, int protocol
,
1373 struct socket
**res
, int kern
)
1376 struct socket
*sock
;
1377 const struct net_proto_family
*pf
;
1380 * Check protocol is in range
1382 if (family
< 0 || family
>= NPROTO
)
1383 return -EAFNOSUPPORT
;
1384 if (type
< 0 || type
>= SOCK_MAX
)
1389 This uglymoron is moved from INET layer to here to avoid
1390 deadlock in module load.
1392 if (family
== PF_INET
&& type
== SOCK_PACKET
) {
1393 pr_info_once("%s uses obsolete (PF_INET,SOCK_PACKET)\n",
1398 err
= security_socket_create(family
, type
, protocol
, kern
);
1403 * Allocate the socket and allow the family to set things up. if
1404 * the protocol is 0, the family is instructed to select an appropriate
1407 sock
= sock_alloc();
1409 net_warn_ratelimited("socket: no more sockets\n");
1410 return -ENFILE
; /* Not exactly a match, but its the
1411 closest posix thing */
1416 #ifdef CONFIG_MODULES
1417 /* Attempt to load a protocol module if the find failed.
1419 * 12/09/1996 Marcin: But! this makes REALLY only sense, if the user
1420 * requested real, full-featured networking support upon configuration.
1421 * Otherwise module support will break!
1423 if (rcu_access_pointer(net_families
[family
]) == NULL
)
1424 request_module("net-pf-%d", family
);
1428 pf
= rcu_dereference(net_families
[family
]);
1429 err
= -EAFNOSUPPORT
;
1434 * We will call the ->create function, that possibly is in a loadable
1435 * module, so we have to bump that loadable module refcnt first.
1437 if (!try_module_get(pf
->owner
))
1440 /* Now protected by module ref count */
1443 err
= pf
->create(net
, sock
, protocol
, kern
);
1445 goto out_module_put
;
1448 * Now to bump the refcnt of the [loadable] module that owns this
1449 * socket at sock_release time we decrement its refcnt.
1451 if (!try_module_get(sock
->ops
->owner
))
1452 goto out_module_busy
;
1455 * Now that we're done with the ->create function, the [loadable]
1456 * module can have its refcnt decremented
1458 module_put(pf
->owner
);
1459 err
= security_socket_post_create(sock
, family
, type
, protocol
, kern
);
1461 goto out_sock_release
;
1467 err
= -EAFNOSUPPORT
;
1470 module_put(pf
->owner
);
1477 goto out_sock_release
;
1479 EXPORT_SYMBOL(__sock_create
);
1482 * sock_create - creates a socket
1483 * @family: protocol family (AF_INET, ...)
1484 * @type: communication type (SOCK_STREAM, ...)
1485 * @protocol: protocol (0, ...)
1488 * A wrapper around __sock_create().
1489 * Returns 0 or an error. This function internally uses GFP_KERNEL.
1492 int sock_create(int family
, int type
, int protocol
, struct socket
**res
)
1494 return __sock_create(current
->nsproxy
->net_ns
, family
, type
, protocol
, res
, 0);
1496 EXPORT_SYMBOL(sock_create
);
1499 * sock_create_kern - creates a socket (kernel space)
1500 * @net: net namespace
1501 * @family: protocol family (AF_INET, ...)
1502 * @type: communication type (SOCK_STREAM, ...)
1503 * @protocol: protocol (0, ...)
1506 * A wrapper around __sock_create().
1507 * Returns 0 or an error. This function internally uses GFP_KERNEL.
1510 int sock_create_kern(struct net
*net
, int family
, int type
, int protocol
, struct socket
**res
)
1512 return __sock_create(net
, family
, type
, protocol
, res
, 1);
1514 EXPORT_SYMBOL(sock_create_kern
);
1516 int __sys_socket(int family
, int type
, int protocol
)
1519 struct socket
*sock
;
1522 /* Check the SOCK_* constants for consistency. */
1523 BUILD_BUG_ON(SOCK_CLOEXEC
!= O_CLOEXEC
);
1524 BUILD_BUG_ON((SOCK_MAX
| SOCK_TYPE_MASK
) != SOCK_TYPE_MASK
);
1525 BUILD_BUG_ON(SOCK_CLOEXEC
& SOCK_TYPE_MASK
);
1526 BUILD_BUG_ON(SOCK_NONBLOCK
& SOCK_TYPE_MASK
);
1528 flags
= type
& ~SOCK_TYPE_MASK
;
1529 if (flags
& ~(SOCK_CLOEXEC
| SOCK_NONBLOCK
))
1531 type
&= SOCK_TYPE_MASK
;
1533 if (SOCK_NONBLOCK
!= O_NONBLOCK
&& (flags
& SOCK_NONBLOCK
))
1534 flags
= (flags
& ~SOCK_NONBLOCK
) | O_NONBLOCK
;
1536 retval
= sock_create(family
, type
, protocol
, &sock
);
1540 return sock_map_fd(sock
, flags
& (O_CLOEXEC
| O_NONBLOCK
));
1543 SYSCALL_DEFINE3(socket
, int, family
, int, type
, int, protocol
)
1545 return __sys_socket(family
, type
, protocol
);
1549 * Create a pair of connected sockets.
1552 int __sys_socketpair(int family
, int type
, int protocol
, int __user
*usockvec
)
1554 struct socket
*sock1
, *sock2
;
1556 struct file
*newfile1
, *newfile2
;
1559 flags
= type
& ~SOCK_TYPE_MASK
;
1560 if (flags
& ~(SOCK_CLOEXEC
| SOCK_NONBLOCK
))
1562 type
&= SOCK_TYPE_MASK
;
1564 if (SOCK_NONBLOCK
!= O_NONBLOCK
&& (flags
& SOCK_NONBLOCK
))
1565 flags
= (flags
& ~SOCK_NONBLOCK
) | O_NONBLOCK
;
1568 * reserve descriptors and make sure we won't fail
1569 * to return them to userland.
1571 fd1
= get_unused_fd_flags(flags
);
1572 if (unlikely(fd1
< 0))
1575 fd2
= get_unused_fd_flags(flags
);
1576 if (unlikely(fd2
< 0)) {
1581 err
= put_user(fd1
, &usockvec
[0]);
1585 err
= put_user(fd2
, &usockvec
[1]);
1590 * Obtain the first socket and check if the underlying protocol
1591 * supports the socketpair call.
1594 err
= sock_create(family
, type
, protocol
, &sock1
);
1595 if (unlikely(err
< 0))
1598 err
= sock_create(family
, type
, protocol
, &sock2
);
1599 if (unlikely(err
< 0)) {
1600 sock_release(sock1
);
1604 err
= security_socket_socketpair(sock1
, sock2
);
1605 if (unlikely(err
)) {
1606 sock_release(sock2
);
1607 sock_release(sock1
);
1611 err
= sock1
->ops
->socketpair(sock1
, sock2
);
1612 if (unlikely(err
< 0)) {
1613 sock_release(sock2
);
1614 sock_release(sock1
);
1618 newfile1
= sock_alloc_file(sock1
, flags
, NULL
);
1619 if (IS_ERR(newfile1
)) {
1620 err
= PTR_ERR(newfile1
);
1621 sock_release(sock2
);
1625 newfile2
= sock_alloc_file(sock2
, flags
, NULL
);
1626 if (IS_ERR(newfile2
)) {
1627 err
= PTR_ERR(newfile2
);
1632 audit_fd_pair(fd1
, fd2
);
1634 fd_install(fd1
, newfile1
);
1635 fd_install(fd2
, newfile2
);
1644 SYSCALL_DEFINE4(socketpair
, int, family
, int, type
, int, protocol
,
1645 int __user
*, usockvec
)
1647 return __sys_socketpair(family
, type
, protocol
, usockvec
);
1651 * Bind a name to a socket. Nothing much to do here since it's
1652 * the protocol's responsibility to handle the local address.
1654 * We move the socket address to kernel space before we call
1655 * the protocol layer (having also checked the address is ok).
1658 int __sys_bind(int fd
, struct sockaddr __user
*umyaddr
, int addrlen
)
1660 struct socket
*sock
;
1661 struct sockaddr_storage address
;
1662 int err
, fput_needed
;
1664 sock
= sockfd_lookup_light(fd
, &err
, &fput_needed
);
1666 err
= move_addr_to_kernel(umyaddr
, addrlen
, &address
);
1668 err
= security_socket_bind(sock
,
1669 (struct sockaddr
*)&address
,
1672 err
= sock
->ops
->bind(sock
,
1676 fput_light(sock
->file
, fput_needed
);
1681 SYSCALL_DEFINE3(bind
, int, fd
, struct sockaddr __user
*, umyaddr
, int, addrlen
)
1683 return __sys_bind(fd
, umyaddr
, addrlen
);
1687 * Perform a listen. Basically, we allow the protocol to do anything
1688 * necessary for a listen, and if that works, we mark the socket as
1689 * ready for listening.
1692 int __sys_listen(int fd
, int backlog
)
1694 struct socket
*sock
;
1695 int err
, fput_needed
;
1698 sock
= sockfd_lookup_light(fd
, &err
, &fput_needed
);
1700 somaxconn
= sock_net(sock
->sk
)->core
.sysctl_somaxconn
;
1701 if ((unsigned int)backlog
> somaxconn
)
1702 backlog
= somaxconn
;
1704 err
= security_socket_listen(sock
, backlog
);
1706 err
= sock
->ops
->listen(sock
, backlog
);
1708 fput_light(sock
->file
, fput_needed
);
1713 SYSCALL_DEFINE2(listen
, int, fd
, int, backlog
)
1715 return __sys_listen(fd
, backlog
);
1718 int __sys_accept4_file(struct file
*file
, unsigned file_flags
,
1719 struct sockaddr __user
*upeer_sockaddr
,
1720 int __user
*upeer_addrlen
, int flags
,
1721 unsigned long nofile
)
1723 struct socket
*sock
, *newsock
;
1724 struct file
*newfile
;
1725 int err
, len
, newfd
;
1726 struct sockaddr_storage address
;
1728 if (flags
& ~(SOCK_CLOEXEC
| SOCK_NONBLOCK
))
1731 if (SOCK_NONBLOCK
!= O_NONBLOCK
&& (flags
& SOCK_NONBLOCK
))
1732 flags
= (flags
& ~SOCK_NONBLOCK
) | O_NONBLOCK
;
1734 sock
= sock_from_file(file
);
1741 newsock
= sock_alloc();
1745 newsock
->type
= sock
->type
;
1746 newsock
->ops
= sock
->ops
;
1749 * We don't need try_module_get here, as the listening socket (sock)
1750 * has the protocol module (sock->ops->owner) held.
1752 __module_get(newsock
->ops
->owner
);
1754 newfd
= __get_unused_fd_flags(flags
, nofile
);
1755 if (unlikely(newfd
< 0)) {
1757 sock_release(newsock
);
1760 newfile
= sock_alloc_file(newsock
, flags
, sock
->sk
->sk_prot_creator
->name
);
1761 if (IS_ERR(newfile
)) {
1762 err
= PTR_ERR(newfile
);
1763 put_unused_fd(newfd
);
1767 err
= security_socket_accept(sock
, newsock
);
1771 err
= sock
->ops
->accept(sock
, newsock
, sock
->file
->f_flags
| file_flags
,
1776 if (upeer_sockaddr
) {
1777 len
= newsock
->ops
->getname(newsock
,
1778 (struct sockaddr
*)&address
, 2);
1780 err
= -ECONNABORTED
;
1783 err
= move_addr_to_user(&address
,
1784 len
, upeer_sockaddr
, upeer_addrlen
);
1789 /* File flags are not inherited via accept() unlike another OSes. */
1791 fd_install(newfd
, newfile
);
1797 put_unused_fd(newfd
);
1803 * For accept, we attempt to create a new socket, set up the link
1804 * with the client, wake up the client, then return the new
1805 * connected fd. We collect the address of the connector in kernel
1806 * space and move it to user at the very end. This is unclean because
1807 * we open the socket then return an error.
1809 * 1003.1g adds the ability to recvmsg() to query connection pending
1810 * status to recvmsg. We need to add that support in a way thats
1811 * clean when we restructure accept also.
1814 int __sys_accept4(int fd
, struct sockaddr __user
*upeer_sockaddr
,
1815 int __user
*upeer_addrlen
, int flags
)
1822 ret
= __sys_accept4_file(f
.file
, 0, upeer_sockaddr
,
1823 upeer_addrlen
, flags
,
1824 rlimit(RLIMIT_NOFILE
));
1831 SYSCALL_DEFINE4(accept4
, int, fd
, struct sockaddr __user
*, upeer_sockaddr
,
1832 int __user
*, upeer_addrlen
, int, flags
)
1834 return __sys_accept4(fd
, upeer_sockaddr
, upeer_addrlen
, flags
);
1837 SYSCALL_DEFINE3(accept
, int, fd
, struct sockaddr __user
*, upeer_sockaddr
,
1838 int __user
*, upeer_addrlen
)
1840 return __sys_accept4(fd
, upeer_sockaddr
, upeer_addrlen
, 0);
1844 * Attempt to connect to a socket with the server address. The address
1845 * is in user space so we verify it is OK and move it to kernel space.
1847 * For 1003.1g we need to add clean support for a bind to AF_UNSPEC to
1850 * NOTE: 1003.1g draft 6.3 is broken with respect to AX.25/NetROM and
1851 * other SEQPACKET protocols that take time to connect() as it doesn't
1852 * include the -EINPROGRESS status for such sockets.
1855 int __sys_connect_file(struct file
*file
, struct sockaddr_storage
*address
,
1856 int addrlen
, int file_flags
)
1858 struct socket
*sock
;
1861 sock
= sock_from_file(file
);
1868 security_socket_connect(sock
, (struct sockaddr
*)address
, addrlen
);
1872 err
= sock
->ops
->connect(sock
, (struct sockaddr
*)address
, addrlen
,
1873 sock
->file
->f_flags
| file_flags
);
1878 int __sys_connect(int fd
, struct sockaddr __user
*uservaddr
, int addrlen
)
1885 struct sockaddr_storage address
;
1887 ret
= move_addr_to_kernel(uservaddr
, addrlen
, &address
);
1889 ret
= __sys_connect_file(f
.file
, &address
, addrlen
, 0);
1896 SYSCALL_DEFINE3(connect
, int, fd
, struct sockaddr __user
*, uservaddr
,
1899 return __sys_connect(fd
, uservaddr
, addrlen
);
1903 * Get the local address ('name') of a socket object. Move the obtained
1904 * name to user space.
1907 int __sys_getsockname(int fd
, struct sockaddr __user
*usockaddr
,
1908 int __user
*usockaddr_len
)
1910 struct socket
*sock
;
1911 struct sockaddr_storage address
;
1912 int err
, fput_needed
;
1914 sock
= sockfd_lookup_light(fd
, &err
, &fput_needed
);
1918 err
= security_socket_getsockname(sock
);
1922 err
= sock
->ops
->getname(sock
, (struct sockaddr
*)&address
, 0);
1925 /* "err" is actually length in this case */
1926 err
= move_addr_to_user(&address
, err
, usockaddr
, usockaddr_len
);
1929 fput_light(sock
->file
, fput_needed
);
1934 SYSCALL_DEFINE3(getsockname
, int, fd
, struct sockaddr __user
*, usockaddr
,
1935 int __user
*, usockaddr_len
)
1937 return __sys_getsockname(fd
, usockaddr
, usockaddr_len
);
1941 * Get the remote address ('name') of a socket object. Move the obtained
1942 * name to user space.
1945 int __sys_getpeername(int fd
, struct sockaddr __user
*usockaddr
,
1946 int __user
*usockaddr_len
)
1948 struct socket
*sock
;
1949 struct sockaddr_storage address
;
1950 int err
, fput_needed
;
1952 sock
= sockfd_lookup_light(fd
, &err
, &fput_needed
);
1954 err
= security_socket_getpeername(sock
);
1956 fput_light(sock
->file
, fput_needed
);
1960 err
= sock
->ops
->getname(sock
, (struct sockaddr
*)&address
, 1);
1962 /* "err" is actually length in this case */
1963 err
= move_addr_to_user(&address
, err
, usockaddr
,
1965 fput_light(sock
->file
, fput_needed
);
1970 SYSCALL_DEFINE3(getpeername
, int, fd
, struct sockaddr __user
*, usockaddr
,
1971 int __user
*, usockaddr_len
)
1973 return __sys_getpeername(fd
, usockaddr
, usockaddr_len
);
1977 * Send a datagram to a given address. We move the address into kernel
1978 * space and check the user space data area is readable before invoking
1981 int __sys_sendto(int fd
, void __user
*buff
, size_t len
, unsigned int flags
,
1982 struct sockaddr __user
*addr
, int addr_len
)
1984 struct socket
*sock
;
1985 struct sockaddr_storage address
;
1991 err
= import_single_range(WRITE
, buff
, len
, &iov
, &msg
.msg_iter
);
1994 sock
= sockfd_lookup_light(fd
, &err
, &fput_needed
);
1998 msg
.msg_name
= NULL
;
1999 msg
.msg_control
= NULL
;
2000 msg
.msg_controllen
= 0;
2001 msg
.msg_namelen
= 0;
2003 err
= move_addr_to_kernel(addr
, addr_len
, &address
);
2006 msg
.msg_name
= (struct sockaddr
*)&address
;
2007 msg
.msg_namelen
= addr_len
;
2009 if (sock
->file
->f_flags
& O_NONBLOCK
)
2010 flags
|= MSG_DONTWAIT
;
2011 msg
.msg_flags
= flags
;
2012 err
= sock_sendmsg(sock
, &msg
);
2015 fput_light(sock
->file
, fput_needed
);
2020 SYSCALL_DEFINE6(sendto
, int, fd
, void __user
*, buff
, size_t, len
,
2021 unsigned int, flags
, struct sockaddr __user
*, addr
,
2024 return __sys_sendto(fd
, buff
, len
, flags
, addr
, addr_len
);
2028 * Send a datagram down a socket.
2031 SYSCALL_DEFINE4(send
, int, fd
, void __user
*, buff
, size_t, len
,
2032 unsigned int, flags
)
2034 return __sys_sendto(fd
, buff
, len
, flags
, NULL
, 0);
2038 * Receive a frame from the socket and optionally record the address of the
2039 * sender. We verify the buffers are writable and if needed move the
2040 * sender address from kernel to user space.
2042 int __sys_recvfrom(int fd
, void __user
*ubuf
, size_t size
, unsigned int flags
,
2043 struct sockaddr __user
*addr
, int __user
*addr_len
)
2045 struct socket
*sock
;
2048 struct sockaddr_storage address
;
2052 err
= import_single_range(READ
, ubuf
, size
, &iov
, &msg
.msg_iter
);
2055 sock
= sockfd_lookup_light(fd
, &err
, &fput_needed
);
2059 msg
.msg_control
= NULL
;
2060 msg
.msg_controllen
= 0;
2061 /* Save some cycles and don't copy the address if not needed */
2062 msg
.msg_name
= addr
? (struct sockaddr
*)&address
: NULL
;
2063 /* We assume all kernel code knows the size of sockaddr_storage */
2064 msg
.msg_namelen
= 0;
2065 msg
.msg_iocb
= NULL
;
2067 if (sock
->file
->f_flags
& O_NONBLOCK
)
2068 flags
|= MSG_DONTWAIT
;
2069 err
= sock_recvmsg(sock
, &msg
, flags
);
2071 if (err
>= 0 && addr
!= NULL
) {
2072 err2
= move_addr_to_user(&address
,
2073 msg
.msg_namelen
, addr
, addr_len
);
2078 fput_light(sock
->file
, fput_needed
);
2083 SYSCALL_DEFINE6(recvfrom
, int, fd
, void __user
*, ubuf
, size_t, size
,
2084 unsigned int, flags
, struct sockaddr __user
*, addr
,
2085 int __user
*, addr_len
)
2087 return __sys_recvfrom(fd
, ubuf
, size
, flags
, addr
, addr_len
);
2091 * Receive a datagram from a socket.
2094 SYSCALL_DEFINE4(recv
, int, fd
, void __user
*, ubuf
, size_t, size
,
2095 unsigned int, flags
)
2097 return __sys_recvfrom(fd
, ubuf
, size
, flags
, NULL
, NULL
);
2100 static bool sock_use_custom_sol_socket(const struct socket
*sock
)
2102 const struct sock
*sk
= sock
->sk
;
2104 /* Use sock->ops->setsockopt() for MPTCP */
2105 return IS_ENABLED(CONFIG_MPTCP
) &&
2106 sk
->sk_protocol
== IPPROTO_MPTCP
&&
2107 sk
->sk_type
== SOCK_STREAM
&&
2108 (sk
->sk_family
== AF_INET
|| sk
->sk_family
== AF_INET6
);
2112 * Set a socket option. Because we don't know the option lengths we have
2113 * to pass the user mode parameter for the protocols to sort out.
2115 int __sys_setsockopt(int fd
, int level
, int optname
, char __user
*user_optval
,
2118 sockptr_t optval
= USER_SOCKPTR(user_optval
);
2119 char *kernel_optval
= NULL
;
2120 int err
, fput_needed
;
2121 struct socket
*sock
;
2126 sock
= sockfd_lookup_light(fd
, &err
, &fput_needed
);
2130 err
= security_socket_setsockopt(sock
, level
, optname
);
2134 if (!in_compat_syscall())
2135 err
= BPF_CGROUP_RUN_PROG_SETSOCKOPT(sock
->sk
, &level
, &optname
,
2136 user_optval
, &optlen
,
2146 optval
= KERNEL_SOCKPTR(kernel_optval
);
2147 if (level
== SOL_SOCKET
&& !sock_use_custom_sol_socket(sock
))
2148 err
= sock_setsockopt(sock
, level
, optname
, optval
, optlen
);
2149 else if (unlikely(!sock
->ops
->setsockopt
))
2152 err
= sock
->ops
->setsockopt(sock
, level
, optname
, optval
,
2154 kfree(kernel_optval
);
2156 fput_light(sock
->file
, fput_needed
);
2160 SYSCALL_DEFINE5(setsockopt
, int, fd
, int, level
, int, optname
,
2161 char __user
*, optval
, int, optlen
)
2163 return __sys_setsockopt(fd
, level
, optname
, optval
, optlen
);
2166 INDIRECT_CALLABLE_DECLARE(bool tcp_bpf_bypass_getsockopt(int level
,
2170 * Get a socket option. Because we don't know the option lengths we have
2171 * to pass a user mode parameter for the protocols to sort out.
2173 int __sys_getsockopt(int fd
, int level
, int optname
, char __user
*optval
,
2176 int err
, fput_needed
;
2177 struct socket
*sock
;
2180 sock
= sockfd_lookup_light(fd
, &err
, &fput_needed
);
2184 err
= security_socket_getsockopt(sock
, level
, optname
);
2188 if (!in_compat_syscall())
2189 max_optlen
= BPF_CGROUP_GETSOCKOPT_MAX_OPTLEN(optlen
);
2191 if (level
== SOL_SOCKET
)
2192 err
= sock_getsockopt(sock
, level
, optname
, optval
, optlen
);
2193 else if (unlikely(!sock
->ops
->getsockopt
))
2196 err
= sock
->ops
->getsockopt(sock
, level
, optname
, optval
,
2199 if (!in_compat_syscall())
2200 err
= BPF_CGROUP_RUN_PROG_GETSOCKOPT(sock
->sk
, level
, optname
,
2201 optval
, optlen
, max_optlen
,
2204 fput_light(sock
->file
, fput_needed
);
2208 SYSCALL_DEFINE5(getsockopt
, int, fd
, int, level
, int, optname
,
2209 char __user
*, optval
, int __user
*, optlen
)
2211 return __sys_getsockopt(fd
, level
, optname
, optval
, optlen
);
2215 * Shutdown a socket.
2218 int __sys_shutdown_sock(struct socket
*sock
, int how
)
2222 err
= security_socket_shutdown(sock
, how
);
2224 err
= sock
->ops
->shutdown(sock
, how
);
2229 int __sys_shutdown(int fd
, int how
)
2231 int err
, fput_needed
;
2232 struct socket
*sock
;
2234 sock
= sockfd_lookup_light(fd
, &err
, &fput_needed
);
2236 err
= __sys_shutdown_sock(sock
, how
);
2237 fput_light(sock
->file
, fput_needed
);
2242 SYSCALL_DEFINE2(shutdown
, int, fd
, int, how
)
2244 return __sys_shutdown(fd
, how
);
2247 /* A couple of helpful macros for getting the address of the 32/64 bit
2248 * fields which are the same type (int / unsigned) on our platforms.
2250 #define COMPAT_MSG(msg, member) ((MSG_CMSG_COMPAT & flags) ? &msg##_compat->member : &msg->member)
2251 #define COMPAT_NAMELEN(msg) COMPAT_MSG(msg, msg_namelen)
2252 #define COMPAT_FLAGS(msg) COMPAT_MSG(msg, msg_flags)
2254 struct used_address
{
2255 struct sockaddr_storage name
;
2256 unsigned int name_len
;
2259 int __copy_msghdr_from_user(struct msghdr
*kmsg
,
2260 struct user_msghdr __user
*umsg
,
2261 struct sockaddr __user
**save_addr
,
2262 struct iovec __user
**uiov
, size_t *nsegs
)
2264 struct user_msghdr msg
;
2267 if (copy_from_user(&msg
, umsg
, sizeof(*umsg
)))
2270 kmsg
->msg_control_is_user
= true;
2271 kmsg
->msg_control_user
= msg
.msg_control
;
2272 kmsg
->msg_controllen
= msg
.msg_controllen
;
2273 kmsg
->msg_flags
= msg
.msg_flags
;
2275 kmsg
->msg_namelen
= msg
.msg_namelen
;
2277 kmsg
->msg_namelen
= 0;
2279 if (kmsg
->msg_namelen
< 0)
2282 if (kmsg
->msg_namelen
> sizeof(struct sockaddr_storage
))
2283 kmsg
->msg_namelen
= sizeof(struct sockaddr_storage
);
2286 *save_addr
= msg
.msg_name
;
2288 if (msg
.msg_name
&& kmsg
->msg_namelen
) {
2290 err
= move_addr_to_kernel(msg
.msg_name
,
2297 kmsg
->msg_name
= NULL
;
2298 kmsg
->msg_namelen
= 0;
2301 if (msg
.msg_iovlen
> UIO_MAXIOV
)
2304 kmsg
->msg_iocb
= NULL
;
2305 *uiov
= msg
.msg_iov
;
2306 *nsegs
= msg
.msg_iovlen
;
2310 static int copy_msghdr_from_user(struct msghdr
*kmsg
,
2311 struct user_msghdr __user
*umsg
,
2312 struct sockaddr __user
**save_addr
,
2315 struct user_msghdr msg
;
2318 err
= __copy_msghdr_from_user(kmsg
, umsg
, save_addr
, &msg
.msg_iov
,
2323 err
= import_iovec(save_addr
? READ
: WRITE
,
2324 msg
.msg_iov
, msg
.msg_iovlen
,
2325 UIO_FASTIOV
, iov
, &kmsg
->msg_iter
);
2326 return err
< 0 ? err
: 0;
2329 static int ____sys_sendmsg(struct socket
*sock
, struct msghdr
*msg_sys
,
2330 unsigned int flags
, struct used_address
*used_address
,
2331 unsigned int allowed_msghdr_flags
)
2333 unsigned char ctl
[sizeof(struct cmsghdr
) + 20]
2334 __aligned(sizeof(__kernel_size_t
));
2335 /* 20 is size of ipv6_pktinfo */
2336 unsigned char *ctl_buf
= ctl
;
2342 if (msg_sys
->msg_controllen
> INT_MAX
)
2344 flags
|= (msg_sys
->msg_flags
& allowed_msghdr_flags
);
2345 ctl_len
= msg_sys
->msg_controllen
;
2346 if ((MSG_CMSG_COMPAT
& flags
) && ctl_len
) {
2348 cmsghdr_from_user_compat_to_kern(msg_sys
, sock
->sk
, ctl
,
2352 ctl_buf
= msg_sys
->msg_control
;
2353 ctl_len
= msg_sys
->msg_controllen
;
2354 } else if (ctl_len
) {
2355 BUILD_BUG_ON(sizeof(struct cmsghdr
) !=
2356 CMSG_ALIGN(sizeof(struct cmsghdr
)));
2357 if (ctl_len
> sizeof(ctl
)) {
2358 ctl_buf
= sock_kmalloc(sock
->sk
, ctl_len
, GFP_KERNEL
);
2359 if (ctl_buf
== NULL
)
2363 if (copy_from_user(ctl_buf
, msg_sys
->msg_control_user
, ctl_len
))
2365 msg_sys
->msg_control
= ctl_buf
;
2366 msg_sys
->msg_control_is_user
= false;
2368 msg_sys
->msg_flags
= flags
;
2370 if (sock
->file
->f_flags
& O_NONBLOCK
)
2371 msg_sys
->msg_flags
|= MSG_DONTWAIT
;
2373 * If this is sendmmsg() and current destination address is same as
2374 * previously succeeded address, omit asking LSM's decision.
2375 * used_address->name_len is initialized to UINT_MAX so that the first
2376 * destination address never matches.
2378 if (used_address
&& msg_sys
->msg_name
&&
2379 used_address
->name_len
== msg_sys
->msg_namelen
&&
2380 !memcmp(&used_address
->name
, msg_sys
->msg_name
,
2381 used_address
->name_len
)) {
2382 err
= sock_sendmsg_nosec(sock
, msg_sys
);
2385 err
= sock_sendmsg(sock
, msg_sys
);
2387 * If this is sendmmsg() and sending to current destination address was
2388 * successful, remember it.
2390 if (used_address
&& err
>= 0) {
2391 used_address
->name_len
= msg_sys
->msg_namelen
;
2392 if (msg_sys
->msg_name
)
2393 memcpy(&used_address
->name
, msg_sys
->msg_name
,
2394 used_address
->name_len
);
2399 sock_kfree_s(sock
->sk
, ctl_buf
, ctl_len
);
2404 int sendmsg_copy_msghdr(struct msghdr
*msg
,
2405 struct user_msghdr __user
*umsg
, unsigned flags
,
2410 if (flags
& MSG_CMSG_COMPAT
) {
2411 struct compat_msghdr __user
*msg_compat
;
2413 msg_compat
= (struct compat_msghdr __user
*) umsg
;
2414 err
= get_compat_msghdr(msg
, msg_compat
, NULL
, iov
);
2416 err
= copy_msghdr_from_user(msg
, umsg
, NULL
, iov
);
2424 static int ___sys_sendmsg(struct socket
*sock
, struct user_msghdr __user
*msg
,
2425 struct msghdr
*msg_sys
, unsigned int flags
,
2426 struct used_address
*used_address
,
2427 unsigned int allowed_msghdr_flags
)
2429 struct sockaddr_storage address
;
2430 struct iovec iovstack
[UIO_FASTIOV
], *iov
= iovstack
;
2433 msg_sys
->msg_name
= &address
;
2435 err
= sendmsg_copy_msghdr(msg_sys
, msg
, flags
, &iov
);
2439 err
= ____sys_sendmsg(sock
, msg_sys
, flags
, used_address
,
2440 allowed_msghdr_flags
);
2446 * BSD sendmsg interface
2448 long __sys_sendmsg_sock(struct socket
*sock
, struct msghdr
*msg
,
2451 return ____sys_sendmsg(sock
, msg
, flags
, NULL
, 0);
2454 long __sys_sendmsg(int fd
, struct user_msghdr __user
*msg
, unsigned int flags
,
2455 bool forbid_cmsg_compat
)
2457 int fput_needed
, err
;
2458 struct msghdr msg_sys
;
2459 struct socket
*sock
;
2461 if (forbid_cmsg_compat
&& (flags
& MSG_CMSG_COMPAT
))
2464 sock
= sockfd_lookup_light(fd
, &err
, &fput_needed
);
2468 err
= ___sys_sendmsg(sock
, msg
, &msg_sys
, flags
, NULL
, 0);
2470 fput_light(sock
->file
, fput_needed
);
2475 SYSCALL_DEFINE3(sendmsg
, int, fd
, struct user_msghdr __user
*, msg
, unsigned int, flags
)
2477 return __sys_sendmsg(fd
, msg
, flags
, true);
2481 * Linux sendmmsg interface
2484 int __sys_sendmmsg(int fd
, struct mmsghdr __user
*mmsg
, unsigned int vlen
,
2485 unsigned int flags
, bool forbid_cmsg_compat
)
2487 int fput_needed
, err
, datagrams
;
2488 struct socket
*sock
;
2489 struct mmsghdr __user
*entry
;
2490 struct compat_mmsghdr __user
*compat_entry
;
2491 struct msghdr msg_sys
;
2492 struct used_address used_address
;
2493 unsigned int oflags
= flags
;
2495 if (forbid_cmsg_compat
&& (flags
& MSG_CMSG_COMPAT
))
2498 if (vlen
> UIO_MAXIOV
)
2503 sock
= sockfd_lookup_light(fd
, &err
, &fput_needed
);
2507 used_address
.name_len
= UINT_MAX
;
2509 compat_entry
= (struct compat_mmsghdr __user
*)mmsg
;
2513 while (datagrams
< vlen
) {
2514 if (datagrams
== vlen
- 1)
2517 if (MSG_CMSG_COMPAT
& flags
) {
2518 err
= ___sys_sendmsg(sock
, (struct user_msghdr __user
*)compat_entry
,
2519 &msg_sys
, flags
, &used_address
, MSG_EOR
);
2522 err
= __put_user(err
, &compat_entry
->msg_len
);
2525 err
= ___sys_sendmsg(sock
,
2526 (struct user_msghdr __user
*)entry
,
2527 &msg_sys
, flags
, &used_address
, MSG_EOR
);
2530 err
= put_user(err
, &entry
->msg_len
);
2537 if (msg_data_left(&msg_sys
))
2542 fput_light(sock
->file
, fput_needed
);
2544 /* We only return an error if no datagrams were able to be sent */
2551 SYSCALL_DEFINE4(sendmmsg
, int, fd
, struct mmsghdr __user
*, mmsg
,
2552 unsigned int, vlen
, unsigned int, flags
)
2554 return __sys_sendmmsg(fd
, mmsg
, vlen
, flags
, true);
2557 int recvmsg_copy_msghdr(struct msghdr
*msg
,
2558 struct user_msghdr __user
*umsg
, unsigned flags
,
2559 struct sockaddr __user
**uaddr
,
2564 if (MSG_CMSG_COMPAT
& flags
) {
2565 struct compat_msghdr __user
*msg_compat
;
2567 msg_compat
= (struct compat_msghdr __user
*) umsg
;
2568 err
= get_compat_msghdr(msg
, msg_compat
, uaddr
, iov
);
2570 err
= copy_msghdr_from_user(msg
, umsg
, uaddr
, iov
);
2578 static int ____sys_recvmsg(struct socket
*sock
, struct msghdr
*msg_sys
,
2579 struct user_msghdr __user
*msg
,
2580 struct sockaddr __user
*uaddr
,
2581 unsigned int flags
, int nosec
)
2583 struct compat_msghdr __user
*msg_compat
=
2584 (struct compat_msghdr __user
*) msg
;
2585 int __user
*uaddr_len
= COMPAT_NAMELEN(msg
);
2586 struct sockaddr_storage addr
;
2587 unsigned long cmsg_ptr
;
2591 msg_sys
->msg_name
= &addr
;
2592 cmsg_ptr
= (unsigned long)msg_sys
->msg_control
;
2593 msg_sys
->msg_flags
= flags
& (MSG_CMSG_CLOEXEC
|MSG_CMSG_COMPAT
);
2595 /* We assume all kernel code knows the size of sockaddr_storage */
2596 msg_sys
->msg_namelen
= 0;
2598 if (sock
->file
->f_flags
& O_NONBLOCK
)
2599 flags
|= MSG_DONTWAIT
;
2601 if (unlikely(nosec
))
2602 err
= sock_recvmsg_nosec(sock
, msg_sys
, flags
);
2604 err
= sock_recvmsg(sock
, msg_sys
, flags
);
2610 if (uaddr
!= NULL
) {
2611 err
= move_addr_to_user(&addr
,
2612 msg_sys
->msg_namelen
, uaddr
,
2617 err
= __put_user((msg_sys
->msg_flags
& ~MSG_CMSG_COMPAT
),
2621 if (MSG_CMSG_COMPAT
& flags
)
2622 err
= __put_user((unsigned long)msg_sys
->msg_control
- cmsg_ptr
,
2623 &msg_compat
->msg_controllen
);
2625 err
= __put_user((unsigned long)msg_sys
->msg_control
- cmsg_ptr
,
2626 &msg
->msg_controllen
);
2634 static int ___sys_recvmsg(struct socket
*sock
, struct user_msghdr __user
*msg
,
2635 struct msghdr
*msg_sys
, unsigned int flags
, int nosec
)
2637 struct iovec iovstack
[UIO_FASTIOV
], *iov
= iovstack
;
2638 /* user mode address pointers */
2639 struct sockaddr __user
*uaddr
;
2642 err
= recvmsg_copy_msghdr(msg_sys
, msg
, flags
, &uaddr
, &iov
);
2646 err
= ____sys_recvmsg(sock
, msg_sys
, msg
, uaddr
, flags
, nosec
);
2652 * BSD recvmsg interface
2655 long __sys_recvmsg_sock(struct socket
*sock
, struct msghdr
*msg
,
2656 struct user_msghdr __user
*umsg
,
2657 struct sockaddr __user
*uaddr
, unsigned int flags
)
2659 return ____sys_recvmsg(sock
, msg
, umsg
, uaddr
, flags
, 0);
2662 long __sys_recvmsg(int fd
, struct user_msghdr __user
*msg
, unsigned int flags
,
2663 bool forbid_cmsg_compat
)
2665 int fput_needed
, err
;
2666 struct msghdr msg_sys
;
2667 struct socket
*sock
;
2669 if (forbid_cmsg_compat
&& (flags
& MSG_CMSG_COMPAT
))
2672 sock
= sockfd_lookup_light(fd
, &err
, &fput_needed
);
2676 err
= ___sys_recvmsg(sock
, msg
, &msg_sys
, flags
, 0);
2678 fput_light(sock
->file
, fput_needed
);
2683 SYSCALL_DEFINE3(recvmsg
, int, fd
, struct user_msghdr __user
*, msg
,
2684 unsigned int, flags
)
2686 return __sys_recvmsg(fd
, msg
, flags
, true);
2690 * Linux recvmmsg interface
2693 static int do_recvmmsg(int fd
, struct mmsghdr __user
*mmsg
,
2694 unsigned int vlen
, unsigned int flags
,
2695 struct timespec64
*timeout
)
2697 int fput_needed
, err
, datagrams
;
2698 struct socket
*sock
;
2699 struct mmsghdr __user
*entry
;
2700 struct compat_mmsghdr __user
*compat_entry
;
2701 struct msghdr msg_sys
;
2702 struct timespec64 end_time
;
2703 struct timespec64 timeout64
;
2706 poll_select_set_timeout(&end_time
, timeout
->tv_sec
,
2712 sock
= sockfd_lookup_light(fd
, &err
, &fput_needed
);
2716 if (likely(!(flags
& MSG_ERRQUEUE
))) {
2717 err
= sock_error(sock
->sk
);
2725 compat_entry
= (struct compat_mmsghdr __user
*)mmsg
;
2727 while (datagrams
< vlen
) {
2729 * No need to ask LSM for more than the first datagram.
2731 if (MSG_CMSG_COMPAT
& flags
) {
2732 err
= ___sys_recvmsg(sock
, (struct user_msghdr __user
*)compat_entry
,
2733 &msg_sys
, flags
& ~MSG_WAITFORONE
,
2737 err
= __put_user(err
, &compat_entry
->msg_len
);
2740 err
= ___sys_recvmsg(sock
,
2741 (struct user_msghdr __user
*)entry
,
2742 &msg_sys
, flags
& ~MSG_WAITFORONE
,
2746 err
= put_user(err
, &entry
->msg_len
);
2754 /* MSG_WAITFORONE turns on MSG_DONTWAIT after one packet */
2755 if (flags
& MSG_WAITFORONE
)
2756 flags
|= MSG_DONTWAIT
;
2759 ktime_get_ts64(&timeout64
);
2760 *timeout
= timespec64_sub(end_time
, timeout64
);
2761 if (timeout
->tv_sec
< 0) {
2762 timeout
->tv_sec
= timeout
->tv_nsec
= 0;
2766 /* Timeout, return less than vlen datagrams */
2767 if (timeout
->tv_nsec
== 0 && timeout
->tv_sec
== 0)
2771 /* Out of band data, return right away */
2772 if (msg_sys
.msg_flags
& MSG_OOB
)
2780 if (datagrams
== 0) {
2786 * We may return less entries than requested (vlen) if the
2787 * sock is non block and there aren't enough datagrams...
2789 if (err
!= -EAGAIN
) {
2791 * ... or if recvmsg returns an error after we
2792 * received some datagrams, where we record the
2793 * error to return on the next call or if the
2794 * app asks about it using getsockopt(SO_ERROR).
2796 sock
->sk
->sk_err
= -err
;
2799 fput_light(sock
->file
, fput_needed
);
2804 int __sys_recvmmsg(int fd
, struct mmsghdr __user
*mmsg
,
2805 unsigned int vlen
, unsigned int flags
,
2806 struct __kernel_timespec __user
*timeout
,
2807 struct old_timespec32 __user
*timeout32
)
2810 struct timespec64 timeout_sys
;
2812 if (timeout
&& get_timespec64(&timeout_sys
, timeout
))
2815 if (timeout32
&& get_old_timespec32(&timeout_sys
, timeout32
))
2818 if (!timeout
&& !timeout32
)
2819 return do_recvmmsg(fd
, mmsg
, vlen
, flags
, NULL
);
2821 datagrams
= do_recvmmsg(fd
, mmsg
, vlen
, flags
, &timeout_sys
);
2826 if (timeout
&& put_timespec64(&timeout_sys
, timeout
))
2827 datagrams
= -EFAULT
;
2829 if (timeout32
&& put_old_timespec32(&timeout_sys
, timeout32
))
2830 datagrams
= -EFAULT
;
2835 SYSCALL_DEFINE5(recvmmsg
, int, fd
, struct mmsghdr __user
*, mmsg
,
2836 unsigned int, vlen
, unsigned int, flags
,
2837 struct __kernel_timespec __user
*, timeout
)
2839 if (flags
& MSG_CMSG_COMPAT
)
2842 return __sys_recvmmsg(fd
, mmsg
, vlen
, flags
, timeout
, NULL
);
2845 #ifdef CONFIG_COMPAT_32BIT_TIME
2846 SYSCALL_DEFINE5(recvmmsg_time32
, int, fd
, struct mmsghdr __user
*, mmsg
,
2847 unsigned int, vlen
, unsigned int, flags
,
2848 struct old_timespec32 __user
*, timeout
)
2850 if (flags
& MSG_CMSG_COMPAT
)
2853 return __sys_recvmmsg(fd
, mmsg
, vlen
, flags
, NULL
, timeout
);
2857 #ifdef __ARCH_WANT_SYS_SOCKETCALL
2858 /* Argument list sizes for sys_socketcall */
2859 #define AL(x) ((x) * sizeof(unsigned long))
2860 static const unsigned char nargs
[21] = {
2861 AL(0), AL(3), AL(3), AL(3), AL(2), AL(3),
2862 AL(3), AL(3), AL(4), AL(4), AL(4), AL(6),
2863 AL(6), AL(2), AL(5), AL(5), AL(3), AL(3),
2870 * System call vectors.
2872 * Argument checking cleaned up. Saved 20% in size.
2873 * This function doesn't need to set the kernel lock because
2874 * it is set by the callees.
2877 SYSCALL_DEFINE2(socketcall
, int, call
, unsigned long __user
*, args
)
2879 unsigned long a
[AUDITSC_ARGS
];
2880 unsigned long a0
, a1
;
2884 if (call
< 1 || call
> SYS_SENDMMSG
)
2886 call
= array_index_nospec(call
, SYS_SENDMMSG
+ 1);
2889 if (len
> sizeof(a
))
2892 /* copy_from_user should be SMP safe. */
2893 if (copy_from_user(a
, args
, len
))
2896 err
= audit_socketcall(nargs
[call
] / sizeof(unsigned long), a
);
2905 err
= __sys_socket(a0
, a1
, a
[2]);
2908 err
= __sys_bind(a0
, (struct sockaddr __user
*)a1
, a
[2]);
2911 err
= __sys_connect(a0
, (struct sockaddr __user
*)a1
, a
[2]);
2914 err
= __sys_listen(a0
, a1
);
2917 err
= __sys_accept4(a0
, (struct sockaddr __user
*)a1
,
2918 (int __user
*)a
[2], 0);
2920 case SYS_GETSOCKNAME
:
2922 __sys_getsockname(a0
, (struct sockaddr __user
*)a1
,
2923 (int __user
*)a
[2]);
2925 case SYS_GETPEERNAME
:
2927 __sys_getpeername(a0
, (struct sockaddr __user
*)a1
,
2928 (int __user
*)a
[2]);
2930 case SYS_SOCKETPAIR
:
2931 err
= __sys_socketpair(a0
, a1
, a
[2], (int __user
*)a
[3]);
2934 err
= __sys_sendto(a0
, (void __user
*)a1
, a
[2], a
[3],
2938 err
= __sys_sendto(a0
, (void __user
*)a1
, a
[2], a
[3],
2939 (struct sockaddr __user
*)a
[4], a
[5]);
2942 err
= __sys_recvfrom(a0
, (void __user
*)a1
, a
[2], a
[3],
2946 err
= __sys_recvfrom(a0
, (void __user
*)a1
, a
[2], a
[3],
2947 (struct sockaddr __user
*)a
[4],
2948 (int __user
*)a
[5]);
2951 err
= __sys_shutdown(a0
, a1
);
2953 case SYS_SETSOCKOPT
:
2954 err
= __sys_setsockopt(a0
, a1
, a
[2], (char __user
*)a
[3],
2957 case SYS_GETSOCKOPT
:
2959 __sys_getsockopt(a0
, a1
, a
[2], (char __user
*)a
[3],
2960 (int __user
*)a
[4]);
2963 err
= __sys_sendmsg(a0
, (struct user_msghdr __user
*)a1
,
2967 err
= __sys_sendmmsg(a0
, (struct mmsghdr __user
*)a1
, a
[2],
2971 err
= __sys_recvmsg(a0
, (struct user_msghdr __user
*)a1
,
2975 if (IS_ENABLED(CONFIG_64BIT
))
2976 err
= __sys_recvmmsg(a0
, (struct mmsghdr __user
*)a1
,
2978 (struct __kernel_timespec __user
*)a
[4],
2981 err
= __sys_recvmmsg(a0
, (struct mmsghdr __user
*)a1
,
2983 (struct old_timespec32 __user
*)a
[4]);
2986 err
= __sys_accept4(a0
, (struct sockaddr __user
*)a1
,
2987 (int __user
*)a
[2], a
[3]);
2996 #endif /* __ARCH_WANT_SYS_SOCKETCALL */
2999 * sock_register - add a socket protocol handler
3000 * @ops: description of protocol
3002 * This function is called by a protocol handler that wants to
3003 * advertise its address family, and have it linked into the
3004 * socket interface. The value ops->family corresponds to the
3005 * socket system call protocol family.
3007 int sock_register(const struct net_proto_family
*ops
)
3011 if (ops
->family
>= NPROTO
) {
3012 pr_crit("protocol %d >= NPROTO(%d)\n", ops
->family
, NPROTO
);
3016 spin_lock(&net_family_lock
);
3017 if (rcu_dereference_protected(net_families
[ops
->family
],
3018 lockdep_is_held(&net_family_lock
)))
3021 rcu_assign_pointer(net_families
[ops
->family
], ops
);
3024 spin_unlock(&net_family_lock
);
3026 pr_info("NET: Registered %s protocol family\n", pf_family_names
[ops
->family
]);
3029 EXPORT_SYMBOL(sock_register
);
3032 * sock_unregister - remove a protocol handler
3033 * @family: protocol family to remove
3035 * This function is called by a protocol handler that wants to
3036 * remove its address family, and have it unlinked from the
3037 * new socket creation.
3039 * If protocol handler is a module, then it can use module reference
3040 * counts to protect against new references. If protocol handler is not
3041 * a module then it needs to provide its own protection in
3042 * the ops->create routine.
3044 void sock_unregister(int family
)
3046 BUG_ON(family
< 0 || family
>= NPROTO
);
3048 spin_lock(&net_family_lock
);
3049 RCU_INIT_POINTER(net_families
[family
], NULL
);
3050 spin_unlock(&net_family_lock
);
3054 pr_info("NET: Unregistered %s protocol family\n", pf_family_names
[family
]);
3056 EXPORT_SYMBOL(sock_unregister
);
3058 bool sock_is_registered(int family
)
3060 return family
< NPROTO
&& rcu_access_pointer(net_families
[family
]);
3063 static int __init
sock_init(void)
3067 * Initialize the network sysctl infrastructure.
3069 err
= net_sysctl_init();
3074 * Initialize skbuff SLAB cache
3079 * Initialize the protocols module.
3084 err
= register_filesystem(&sock_fs_type
);
3087 sock_mnt
= kern_mount(&sock_fs_type
);
3088 if (IS_ERR(sock_mnt
)) {
3089 err
= PTR_ERR(sock_mnt
);
3093 /* The real protocol initialization is performed in later initcalls.
3096 #ifdef CONFIG_NETFILTER
3097 err
= netfilter_init();
3102 ptp_classifier_init();
3108 unregister_filesystem(&sock_fs_type
);
3112 core_initcall(sock_init
); /* early initcall */
3114 #ifdef CONFIG_PROC_FS
3115 void socket_seq_show(struct seq_file
*seq
)
3117 seq_printf(seq
, "sockets: used %d\n",
3118 sock_inuse_get(seq
->private));
3120 #endif /* CONFIG_PROC_FS */
3122 #ifdef CONFIG_COMPAT
3123 static int compat_dev_ifconf(struct net
*net
, struct compat_ifconf __user
*uifc32
)
3125 struct compat_ifconf ifc32
;
3129 if (copy_from_user(&ifc32
, uifc32
, sizeof(struct compat_ifconf
)))
3132 ifc
.ifc_len
= ifc32
.ifc_len
;
3133 ifc
.ifc_req
= compat_ptr(ifc32
.ifcbuf
);
3136 err
= dev_ifconf(net
, &ifc
, sizeof(struct compat_ifreq
));
3141 ifc32
.ifc_len
= ifc
.ifc_len
;
3142 if (copy_to_user(uifc32
, &ifc32
, sizeof(struct compat_ifconf
)))
3148 static int ethtool_ioctl(struct net
*net
, struct compat_ifreq __user
*ifr32
)
3150 struct compat_ethtool_rxnfc __user
*compat_rxnfc
;
3151 bool convert_in
= false, convert_out
= false;
3152 size_t buf_size
= 0;
3153 struct ethtool_rxnfc __user
*rxnfc
= NULL
;
3155 u32 rule_cnt
= 0, actual_rule_cnt
;
3160 if (get_user(data
, &ifr32
->ifr_ifru
.ifru_data
))
3163 compat_rxnfc
= compat_ptr(data
);
3165 if (get_user(ethcmd
, &compat_rxnfc
->cmd
))
3168 /* Most ethtool structures are defined without padding.
3169 * Unfortunately struct ethtool_rxnfc is an exception.
3174 case ETHTOOL_GRXCLSRLALL
:
3175 /* Buffer size is variable */
3176 if (get_user(rule_cnt
, &compat_rxnfc
->rule_cnt
))
3178 if (rule_cnt
> KMALLOC_MAX_SIZE
/ sizeof(u32
))
3180 buf_size
+= rule_cnt
* sizeof(u32
);
3182 case ETHTOOL_GRXRINGS
:
3183 case ETHTOOL_GRXCLSRLCNT
:
3184 case ETHTOOL_GRXCLSRULE
:
3185 case ETHTOOL_SRXCLSRLINS
:
3188 case ETHTOOL_SRXCLSRLDEL
:
3189 buf_size
+= sizeof(struct ethtool_rxnfc
);
3191 rxnfc
= compat_alloc_user_space(buf_size
);
3195 if (copy_from_user(&ifr
.ifr_name
, &ifr32
->ifr_name
, IFNAMSIZ
))
3198 ifr
.ifr_data
= convert_in
? rxnfc
: (void __user
*)compat_rxnfc
;
3201 /* We expect there to be holes between fs.m_ext and
3202 * fs.ring_cookie and at the end of fs, but nowhere else.
3204 BUILD_BUG_ON(offsetof(struct compat_ethtool_rxnfc
, fs
.m_ext
) +
3205 sizeof(compat_rxnfc
->fs
.m_ext
) !=
3206 offsetof(struct ethtool_rxnfc
, fs
.m_ext
) +
3207 sizeof(rxnfc
->fs
.m_ext
));
3209 offsetof(struct compat_ethtool_rxnfc
, fs
.location
) -
3210 offsetof(struct compat_ethtool_rxnfc
, fs
.ring_cookie
) !=
3211 offsetof(struct ethtool_rxnfc
, fs
.location
) -
3212 offsetof(struct ethtool_rxnfc
, fs
.ring_cookie
));
3214 if (copy_in_user(rxnfc
, compat_rxnfc
,
3215 (void __user
*)(&rxnfc
->fs
.m_ext
+ 1) -
3216 (void __user
*)rxnfc
) ||
3217 copy_in_user(&rxnfc
->fs
.ring_cookie
,
3218 &compat_rxnfc
->fs
.ring_cookie
,
3219 (void __user
*)(&rxnfc
->fs
.location
+ 1) -
3220 (void __user
*)&rxnfc
->fs
.ring_cookie
))
3222 if (ethcmd
== ETHTOOL_GRXCLSRLALL
) {
3223 if (put_user(rule_cnt
, &rxnfc
->rule_cnt
))
3225 } else if (copy_in_user(&rxnfc
->rule_cnt
,
3226 &compat_rxnfc
->rule_cnt
,
3227 sizeof(rxnfc
->rule_cnt
)))
3231 ret
= dev_ioctl(net
, SIOCETHTOOL
, &ifr
, NULL
);
3236 if (copy_in_user(compat_rxnfc
, rxnfc
,
3237 (const void __user
*)(&rxnfc
->fs
.m_ext
+ 1) -
3238 (const void __user
*)rxnfc
) ||
3239 copy_in_user(&compat_rxnfc
->fs
.ring_cookie
,
3240 &rxnfc
->fs
.ring_cookie
,
3241 (const void __user
*)(&rxnfc
->fs
.location
+ 1) -
3242 (const void __user
*)&rxnfc
->fs
.ring_cookie
) ||
3243 copy_in_user(&compat_rxnfc
->rule_cnt
, &rxnfc
->rule_cnt
,
3244 sizeof(rxnfc
->rule_cnt
)))
3247 if (ethcmd
== ETHTOOL_GRXCLSRLALL
) {
3248 /* As an optimisation, we only copy the actual
3249 * number of rules that the underlying
3250 * function returned. Since Mallory might
3251 * change the rule count in user memory, we
3252 * check that it is less than the rule count
3253 * originally given (as the user buffer size),
3254 * which has been range-checked.
3256 if (get_user(actual_rule_cnt
, &rxnfc
->rule_cnt
))
3258 if (actual_rule_cnt
< rule_cnt
)
3259 rule_cnt
= actual_rule_cnt
;
3260 if (copy_in_user(&compat_rxnfc
->rule_locs
[0],
3261 &rxnfc
->rule_locs
[0],
3262 rule_cnt
* sizeof(u32
)))
3270 static int compat_siocwandev(struct net
*net
, struct compat_ifreq __user
*uifr32
)
3272 compat_uptr_t uptr32
;
3277 if (copy_from_user(&ifr
, uifr32
, sizeof(struct compat_ifreq
)))
3280 if (get_user(uptr32
, &uifr32
->ifr_settings
.ifs_ifsu
))
3283 saved
= ifr
.ifr_settings
.ifs_ifsu
.raw_hdlc
;
3284 ifr
.ifr_settings
.ifs_ifsu
.raw_hdlc
= compat_ptr(uptr32
);
3286 err
= dev_ioctl(net
, SIOCWANDEV
, &ifr
, NULL
);
3288 ifr
.ifr_settings
.ifs_ifsu
.raw_hdlc
= saved
;
3289 if (copy_to_user(uifr32
, &ifr
, sizeof(struct compat_ifreq
)))
3295 /* Handle ioctls that use ifreq::ifr_data and just need struct ifreq converted */
3296 static int compat_ifr_data_ioctl(struct net
*net
, unsigned int cmd
,
3297 struct compat_ifreq __user
*u_ifreq32
)
3302 if (copy_from_user(ifreq
.ifr_name
, u_ifreq32
->ifr_name
, IFNAMSIZ
))
3304 if (get_user(data32
, &u_ifreq32
->ifr_data
))
3306 ifreq
.ifr_data
= compat_ptr(data32
);
3308 return dev_ioctl(net
, cmd
, &ifreq
, NULL
);
3311 static int compat_ifreq_ioctl(struct net
*net
, struct socket
*sock
,
3313 struct compat_ifreq __user
*uifr32
)
3315 struct ifreq __user
*uifr
;
3318 /* Handle the fact that while struct ifreq has the same *layout* on
3319 * 32/64 for everything but ifreq::ifru_ifmap and ifreq::ifru_data,
3320 * which are handled elsewhere, it still has different *size* due to
3321 * ifreq::ifru_ifmap (which is 16 bytes on 32 bit, 24 bytes on 64-bit,
3322 * resulting in struct ifreq being 32 and 40 bytes respectively).
3323 * As a result, if the struct happens to be at the end of a page and
3324 * the next page isn't readable/writable, we get a fault. To prevent
3325 * that, copy back and forth to the full size.
3328 uifr
= compat_alloc_user_space(sizeof(*uifr
));
3329 if (copy_in_user(uifr
, uifr32
, sizeof(*uifr32
)))
3332 err
= sock_do_ioctl(net
, sock
, cmd
, (unsigned long)uifr
);
3343 case SIOCGIFBRDADDR
:
3344 case SIOCGIFDSTADDR
:
3345 case SIOCGIFNETMASK
:
3351 if (copy_in_user(uifr32
, uifr
, sizeof(*uifr32
)))
3359 static int compat_sioc_ifmap(struct net
*net
, unsigned int cmd
,
3360 struct compat_ifreq __user
*uifr32
)
3363 struct compat_ifmap __user
*uifmap32
;
3366 uifmap32
= &uifr32
->ifr_ifru
.ifru_map
;
3367 err
= copy_from_user(&ifr
, uifr32
, sizeof(ifr
.ifr_name
));
3368 err
|= get_user(ifr
.ifr_map
.mem_start
, &uifmap32
->mem_start
);
3369 err
|= get_user(ifr
.ifr_map
.mem_end
, &uifmap32
->mem_end
);
3370 err
|= get_user(ifr
.ifr_map
.base_addr
, &uifmap32
->base_addr
);
3371 err
|= get_user(ifr
.ifr_map
.irq
, &uifmap32
->irq
);
3372 err
|= get_user(ifr
.ifr_map
.dma
, &uifmap32
->dma
);
3373 err
|= get_user(ifr
.ifr_map
.port
, &uifmap32
->port
);
3377 err
= dev_ioctl(net
, cmd
, &ifr
, NULL
);
3379 if (cmd
== SIOCGIFMAP
&& !err
) {
3380 err
= copy_to_user(uifr32
, &ifr
, sizeof(ifr
.ifr_name
));
3381 err
|= put_user(ifr
.ifr_map
.mem_start
, &uifmap32
->mem_start
);
3382 err
|= put_user(ifr
.ifr_map
.mem_end
, &uifmap32
->mem_end
);
3383 err
|= put_user(ifr
.ifr_map
.base_addr
, &uifmap32
->base_addr
);
3384 err
|= put_user(ifr
.ifr_map
.irq
, &uifmap32
->irq
);
3385 err
|= put_user(ifr
.ifr_map
.dma
, &uifmap32
->dma
);
3386 err
|= put_user(ifr
.ifr_map
.port
, &uifmap32
->port
);
3393 /* Since old style bridge ioctl's endup using SIOCDEVPRIVATE
3394 * for some operations; this forces use of the newer bridge-utils that
3395 * use compatible ioctls
3397 static int old_bridge_ioctl(compat_ulong_t __user
*argp
)
3401 if (get_user(tmp
, argp
))
3403 if (tmp
== BRCTL_GET_VERSION
)
3404 return BRCTL_VERSION
+ 1;
3408 static int compat_sock_ioctl_trans(struct file
*file
, struct socket
*sock
,
3409 unsigned int cmd
, unsigned long arg
)
3411 void __user
*argp
= compat_ptr(arg
);
3412 struct sock
*sk
= sock
->sk
;
3413 struct net
*net
= sock_net(sk
);
3415 if (cmd
>= SIOCDEVPRIVATE
&& cmd
<= (SIOCDEVPRIVATE
+ 15))
3416 return compat_ifr_data_ioctl(net
, cmd
, argp
);
3421 return old_bridge_ioctl(argp
);
3423 return compat_dev_ifconf(net
, argp
);
3425 return ethtool_ioctl(net
, argp
);
3427 return compat_siocwandev(net
, argp
);
3430 return compat_sioc_ifmap(net
, cmd
, argp
);
3431 case SIOCGSTAMP_OLD
:
3432 case SIOCGSTAMPNS_OLD
:
3433 if (!sock
->ops
->gettstamp
)
3434 return -ENOIOCTLCMD
;
3435 return sock
->ops
->gettstamp(sock
, argp
, cmd
== SIOCGSTAMP_OLD
,
3436 !COMPAT_USE_64BIT_TIME
);
3438 case SIOCBONDSLAVEINFOQUERY
:
3439 case SIOCBONDINFOQUERY
:
3442 return compat_ifr_data_ioctl(net
, cmd
, argp
);
3453 case SIOCGSTAMP_NEW
:
3454 case SIOCGSTAMPNS_NEW
:
3455 return sock_ioctl(file
, cmd
, arg
);
3472 case SIOCSIFHWBROADCAST
:
3474 case SIOCGIFBRDADDR
:
3475 case SIOCSIFBRDADDR
:
3476 case SIOCGIFDSTADDR
:
3477 case SIOCSIFDSTADDR
:
3478 case SIOCGIFNETMASK
:
3479 case SIOCSIFNETMASK
:
3491 case SIOCBONDENSLAVE
:
3492 case SIOCBONDRELEASE
:
3493 case SIOCBONDSETHWADDR
:
3494 case SIOCBONDCHANGEACTIVE
:
3495 return compat_ifreq_ioctl(net
, sock
, cmd
, argp
);
3503 return sock_do_ioctl(net
, sock
, cmd
, arg
);
3506 return -ENOIOCTLCMD
;
3509 static long compat_sock_ioctl(struct file
*file
, unsigned int cmd
,
3512 struct socket
*sock
= file
->private_data
;
3513 int ret
= -ENOIOCTLCMD
;
3520 if (sock
->ops
->compat_ioctl
)
3521 ret
= sock
->ops
->compat_ioctl(sock
, cmd
, arg
);
3523 if (ret
== -ENOIOCTLCMD
&&
3524 (cmd
>= SIOCIWFIRST
&& cmd
<= SIOCIWLAST
))
3525 ret
= compat_wext_handle_ioctl(net
, cmd
, arg
);
3527 if (ret
== -ENOIOCTLCMD
)
3528 ret
= compat_sock_ioctl_trans(file
, sock
, cmd
, arg
);
3535 * kernel_bind - bind an address to a socket (kernel space)
3538 * @addrlen: length of address
3540 * Returns 0 or an error.
3543 int kernel_bind(struct socket
*sock
, struct sockaddr
*addr
, int addrlen
)
3545 return sock
->ops
->bind(sock
, addr
, addrlen
);
3547 EXPORT_SYMBOL(kernel_bind
);
3550 * kernel_listen - move socket to listening state (kernel space)
3552 * @backlog: pending connections queue size
3554 * Returns 0 or an error.
3557 int kernel_listen(struct socket
*sock
, int backlog
)
3559 return sock
->ops
->listen(sock
, backlog
);
3561 EXPORT_SYMBOL(kernel_listen
);
3564 * kernel_accept - accept a connection (kernel space)
3565 * @sock: listening socket
3566 * @newsock: new connected socket
3569 * @flags must be SOCK_CLOEXEC, SOCK_NONBLOCK or 0.
3570 * If it fails, @newsock is guaranteed to be %NULL.
3571 * Returns 0 or an error.
3574 int kernel_accept(struct socket
*sock
, struct socket
**newsock
, int flags
)
3576 struct sock
*sk
= sock
->sk
;
3579 err
= sock_create_lite(sk
->sk_family
, sk
->sk_type
, sk
->sk_protocol
,
3584 err
= sock
->ops
->accept(sock
, *newsock
, flags
, true);
3586 sock_release(*newsock
);
3591 (*newsock
)->ops
= sock
->ops
;
3592 __module_get((*newsock
)->ops
->owner
);
3597 EXPORT_SYMBOL(kernel_accept
);
3600 * kernel_connect - connect a socket (kernel space)
3603 * @addrlen: address length
3604 * @flags: flags (O_NONBLOCK, ...)
3606 * For datagram sockets, @addr is the address to which datagrams are sent
3607 * by default, and the only address from which datagrams are received.
3608 * For stream sockets, attempts to connect to @addr.
3609 * Returns 0 or an error code.
3612 int kernel_connect(struct socket
*sock
, struct sockaddr
*addr
, int addrlen
,
3615 return sock
->ops
->connect(sock
, addr
, addrlen
, flags
);
3617 EXPORT_SYMBOL(kernel_connect
);
3620 * kernel_getsockname - get the address which the socket is bound (kernel space)
3622 * @addr: address holder
3624 * Fills the @addr pointer with the address which the socket is bound.
3625 * Returns 0 or an error code.
3628 int kernel_getsockname(struct socket
*sock
, struct sockaddr
*addr
)
3630 return sock
->ops
->getname(sock
, addr
, 0);
3632 EXPORT_SYMBOL(kernel_getsockname
);
3635 * kernel_getpeername - get the address which the socket is connected (kernel space)
3637 * @addr: address holder
3639 * Fills the @addr pointer with the address which the socket is connected.
3640 * Returns 0 or an error code.
3643 int kernel_getpeername(struct socket
*sock
, struct sockaddr
*addr
)
3645 return sock
->ops
->getname(sock
, addr
, 1);
3647 EXPORT_SYMBOL(kernel_getpeername
);
3650 * kernel_sendpage - send a &page through a socket (kernel space)
3653 * @offset: page offset
3654 * @size: total size in bytes
3655 * @flags: flags (MSG_DONTWAIT, ...)
3657 * Returns the total amount sent in bytes or an error.
3660 int kernel_sendpage(struct socket
*sock
, struct page
*page
, int offset
,
3661 size_t size
, int flags
)
3663 if (sock
->ops
->sendpage
) {
3664 /* Warn in case the improper page to zero-copy send */
3665 WARN_ONCE(!sendpage_ok(page
), "improper page for zero-copy send");
3666 return sock
->ops
->sendpage(sock
, page
, offset
, size
, flags
);
3668 return sock_no_sendpage(sock
, page
, offset
, size
, flags
);
3670 EXPORT_SYMBOL(kernel_sendpage
);
3673 * kernel_sendpage_locked - send a &page through the locked sock (kernel space)
3676 * @offset: page offset
3677 * @size: total size in bytes
3678 * @flags: flags (MSG_DONTWAIT, ...)
3680 * Returns the total amount sent in bytes or an error.
3681 * Caller must hold @sk.
3684 int kernel_sendpage_locked(struct sock
*sk
, struct page
*page
, int offset
,
3685 size_t size
, int flags
)
3687 struct socket
*sock
= sk
->sk_socket
;
3689 if (sock
->ops
->sendpage_locked
)
3690 return sock
->ops
->sendpage_locked(sk
, page
, offset
, size
,
3693 return sock_no_sendpage_locked(sk
, page
, offset
, size
, flags
);
3695 EXPORT_SYMBOL(kernel_sendpage_locked
);
3698 * kernel_sock_shutdown - shut down part of a full-duplex connection (kernel space)
3700 * @how: connection part
3702 * Returns 0 or an error.
3705 int kernel_sock_shutdown(struct socket
*sock
, enum sock_shutdown_cmd how
)
3707 return sock
->ops
->shutdown(sock
, how
);
3709 EXPORT_SYMBOL(kernel_sock_shutdown
);
3712 * kernel_sock_ip_overhead - returns the IP overhead imposed by a socket
3715 * This routine returns the IP overhead imposed by a socket i.e.
3716 * the length of the underlying IP header, depending on whether
3717 * this is an IPv4 or IPv6 socket and the length from IP options turned
3718 * on at the socket. Assumes that the caller has a lock on the socket.
3721 u32
kernel_sock_ip_overhead(struct sock
*sk
)
3723 struct inet_sock
*inet
;
3724 struct ip_options_rcu
*opt
;
3726 #if IS_ENABLED(CONFIG_IPV6)
3727 struct ipv6_pinfo
*np
;
3728 struct ipv6_txoptions
*optv6
= NULL
;
3729 #endif /* IS_ENABLED(CONFIG_IPV6) */
3734 switch (sk
->sk_family
) {
3737 overhead
+= sizeof(struct iphdr
);
3738 opt
= rcu_dereference_protected(inet
->inet_opt
,
3739 sock_owned_by_user(sk
));
3741 overhead
+= opt
->opt
.optlen
;
3743 #if IS_ENABLED(CONFIG_IPV6)
3746 overhead
+= sizeof(struct ipv6hdr
);
3748 optv6
= rcu_dereference_protected(np
->opt
,
3749 sock_owned_by_user(sk
));
3751 overhead
+= (optv6
->opt_flen
+ optv6
->opt_nflen
);
3753 #endif /* IS_ENABLED(CONFIG_IPV6) */
3754 default: /* Returns 0 overhead if the socket is not ipv4 or ipv6 */
3758 EXPORT_SYMBOL(kernel_sock_ip_overhead
);