Minki/linux
1
0
Fork 1
mirror of https://github.com/torvalds/linux.git synced 2024-11-16 17:12:06 +00:00
Code Issues Packages Projects Releases Wiki Activity
c2c5a7051c
linux/net/socket.c
Mikulas Patocka ed6fe9d614 Fix order of arguments to compat_put_time[spec|val] 
Commit 644595f896 ("compat: Handle COMPAT_USE_64BIT_TIME in
net/socket.c") introduced a bug where the helper functions to take
either a 64-bit or compat time[spec|val] got the arguments in the wrong
order, passing the kernel stack pointer off as a user pointer (and vice
versa).

Because of the user address range check, that in turn then causes an
EFAULT due to the user pointer range checking failing for the kernel
address.  Incorrectly resuling in a failed system call for 32-bit
processes with a 64-bit kernel.

On odder architectures like HP-PA (with separate user/kernel address
spaces), it can be used read kernel memory.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Cc: stable@vger.kernel.org
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2012-09-05 18:34:13 -07:00

3384 lines
81 KiB
C
Raw Blame History

/*
* NET An implementation of the SOCKET network access protocol.
*
* Version: @(#)socket.c 1.1.93 18/02/95
*
* Authors: Orest Zborowski, <obz@Kodak.COM>
* Ross Biro
* Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
*
* Fixes:
* Anonymous : NOTSOCK/BADF cleanup. Error fix in
* shutdown()
* Alan Cox : verify_area() fixes
* Alan Cox : Removed DDI
* Jonathan Kamens : SOCK_DGRAM reconnect bug
* Alan Cox : Moved a load of checks to the very
* top level.
* Alan Cox : Move address structures to/from user
* mode above the protocol layers.
* Rob Janssen : Allow 0 length sends.
* Alan Cox : Asynchronous I/O support (cribbed from the
* tty drivers).
* Niibe Yutaka : Asynchronous I/O for writes (4.4BSD style)
* Jeff Uphoff : Made max number of sockets command-line
* configurable.
* Matti Aarnio : Made the number of sockets dynamic,
* to be allocated when needed, and mr.
* Uphoff's max is used as max to be
* allowed to allocate.
* Linus : Argh. removed all the socket allocation
* altogether: it's in the inode now.
* Alan Cox : Made sock_alloc()/sock_release() public
* for NetROM and future kernel nfsd type
* stuff.
* Alan Cox : sendmsg/recvmsg basics.
* Tom Dyas : Export net symbols.
* Marcin Dalecki : Fixed problems with CONFIG_NET="n".
* Alan Cox : Added thread locking to sys_* calls
* for sockets. May have errors at the
* moment.
* Kevin Buhr : Fixed the dumb errors in the above.
* Andi Kleen : Some small cleanups, optimizations,
* and fixed a copy_from_user() bug.
* Tigran Aivazian : sys_send(args) calls sys_sendto(args, NULL, 0)
* Tigran Aivazian : Made listen(2) backlog sanity checks
* protocol-independent
*
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*
*
* This module is effectively the top level interface to the BSD socket
* paradigm.
*
* Based upon Swansea University Computer Society NET3.039
*/
#include <linux/mm.h>
#include <linux/socket.h>
#include <linux/file.h>
#include <linux/net.h>
#include <linux/interrupt.h>
#include <linux/thread_info.h>
#include <linux/rcupdate.h>
#include <linux/netdevice.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/mutex.h>
#include <linux/wanrouter.h>
#include <linux/if_bridge.h>
#include <linux/if_frad.h>
#include <linux/if_vlan.h>
#include <linux/init.h>
#include <linux/poll.h>
#include <linux/cache.h>
#include <linux/module.h>
#include <linux/highmem.h>
#include <linux/mount.h>
#include <linux/security.h>
#include <linux/syscalls.h>
#include <linux/compat.h>
#include <linux/kmod.h>
#include <linux/audit.h>
#include <linux/wireless.h>
#include <linux/nsproxy.h>
#include <linux/magic.h>
#include <linux/slab.h>
#include <asm/uaccess.h>
#include <asm/unistd.h>
#include <net/compat.h>
#include <net/wext.h>
#include <net/cls_cgroup.h>
#include <net/sock.h>
#include <linux/netfilter.h>
#include <linux/if_tun.h>
#include <linux/ipv6_route.h>
#include <linux/route.h>
#include <linux/sockios.h>
#include <linux/atalk.h>
static int sock_no_open(struct inode *irrelevant, struct file *dontcare);
static ssize_t sock_aio_read(struct kiocb *iocb, const struct iovec *iov,
unsigned long nr_segs, loff_t pos);
static ssize_t sock_aio_write(struct kiocb *iocb, const struct iovec *iov,
unsigned long nr_segs, loff_t pos);
static int sock_mmap(struct file *file, struct vm_area_struct *vma);
static int sock_close(struct inode *inode, struct file *file);
static unsigned int sock_poll(struct file *file,
struct poll_table_struct *wait);
static long sock_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
#ifdef CONFIG_COMPAT
static long compat_sock_ioctl(struct file *file,
unsigned int cmd, unsigned long arg);
#endif
static int sock_fasync(int fd, struct file *filp, int on);
static ssize_t sock_sendpage(struct file *file, struct page *page,
int offset, size_t size, loff_t *ppos, int more);
static ssize_t sock_splice_read(struct file *file, loff_t *ppos,
struct pipe_inode_info *pipe, size_t len,
unsigned int flags);
/*
* Socket files have a set of 'special' operations as well as the generic file ones. These don't appear
* in the operation structures but are done directly via the socketcall() multiplexor.
*/
static const struct file_operations socket_file_ops = {
.owner = THIS_MODULE,
.llseek = no_llseek,
.aio_read = sock_aio_read,
.aio_write = sock_aio_write,
.poll = sock_poll,
.unlocked_ioctl = sock_ioctl,
#ifdef CONFIG_COMPAT
.compat_ioctl = compat_sock_ioctl,
#endif
.mmap = sock_mmap,
.open = sock_no_open, /* special open code to disallow open via /proc */
.release = sock_close,
.fasync = sock_fasync,
.sendpage = sock_sendpage,
.splice_write = generic_splice_sendpage,
.splice_read = sock_splice_read,
};
/*
* The protocol list. Each protocol is registered in here.
*/
static DEFINE_SPINLOCK(net_family_lock);
static const struct net_proto_family __rcu *net_families[NPROTO] __read_mostly;
/*
* Statistics counters of the socket lists
*/
static DEFINE_PER_CPU(int, sockets_in_use);
/*
* Support routines.
* Move socket addresses back and forth across the kernel/user
* divide and look after the messy bits.
*/
/**
* move_addr_to_kernel - copy a socket address into kernel space
* @uaddr: Address in user space
* @kaddr: Address in kernel space
* @ulen: Length in user space
*
* The address is copied into kernel space. If the provided address is
* too long an error code of -EINVAL is returned. If the copy gives
* invalid addresses -EFAULT is returned. On a success 0 is returned.
*/
int move_addr_to_kernel(void __user *uaddr, int ulen, struct sockaddr_storage *kaddr)
{
if (ulen < 0 || ulen > sizeof(struct sockaddr_storage))
return -EINVAL;
if (ulen == 0)
return 0;
if (copy_from_user(kaddr, uaddr, ulen))
return -EFAULT;
return audit_sockaddr(ulen, kaddr);
}
/**
* move_addr_to_user - copy an address to user space
* @kaddr: kernel space address
* @klen: length of address in kernel
* @uaddr: user space address
* @ulen: pointer to user length field
*
* The value pointed to by ulen on entry is the buffer length available.
* This is overwritten with the buffer space used. -EINVAL is returned
* if an overlong buffer is specified or a negative buffer size. -EFAULT
* is returned if either the buffer or the length field are not
* accessible.
* After copying the data up to the limit the user specifies, the true
* length of the data is written over the length limit the user
* specified. Zero is returned for a success.
*/
static int move_addr_to_user(struct sockaddr_storage *kaddr, int klen,
void __user *uaddr, int __user *ulen)
{
int err;
int len;
err = get_user(len, ulen);
if (err)
return err;
if (len > klen)
len = klen;
if (len < 0 || len > sizeof(struct sockaddr_storage))
return -EINVAL;
if (len) {
if (audit_sockaddr(klen, kaddr))
return -ENOMEM;
if (copy_to_user(uaddr, kaddr, len))
return -EFAULT;
}
/*
* "fromlen shall refer to the value before truncation.."
* 1003.1g
*/
return __put_user(klen, ulen);
}
static struct kmem_cache *sock_inode_cachep __read_mostly;
static struct inode *sock_alloc_inode(struct super_block *sb)
{
struct socket_alloc *ei;
struct socket_wq *wq;
ei = kmem_cache_alloc(sock_inode_cachep, GFP_KERNEL);
if (!ei)
return NULL;
wq = kmalloc(sizeof(*wq), GFP_KERNEL);
if (!wq) {
kmem_cache_free(sock_inode_cachep, ei);
return NULL;
}
init_waitqueue_head(&wq->wait);
wq->fasync_list = NULL;
RCU_INIT_POINTER(ei->socket.wq, wq);
ei->socket.state = SS_UNCONNECTED;
ei->socket.flags = 0;
ei->socket.ops = NULL;
ei->socket.sk = NULL;
ei->socket.file = NULL;
return &ei->vfs_inode;
}
static void sock_destroy_inode(struct inode *inode)
{
struct socket_alloc *ei;
struct socket_wq *wq;
ei = container_of(inode, struct socket_alloc, vfs_inode);
wq = rcu_dereference_protected(ei->socket.wq, 1);
kfree_rcu(wq, rcu);
kmem_cache_free(sock_inode_cachep, ei);
}
static void init_once(void *foo)
{
struct socket_alloc *ei = (struct socket_alloc *)foo;
inode_init_once(&ei->vfs_inode);
}
static int init_inodecache(void)
{
sock_inode_cachep = kmem_cache_create("sock_inode_cache",
sizeof(struct socket_alloc),
0,
(SLAB_HWCACHE_ALIGN |
SLAB_RECLAIM_ACCOUNT |
SLAB_MEM_SPREAD),
init_once);
if (sock_inode_cachep == NULL)
return -ENOMEM;
return 0;
}
static const struct super_operations sockfs_ops = {
.alloc_inode = sock_alloc_inode,
.destroy_inode = sock_destroy_inode,
.statfs = simple_statfs,
};
/*
* sockfs_dname() is called from d_path().
*/
static char *sockfs_dname(struct dentry *dentry, char *buffer, int buflen)
{
return dynamic_dname(dentry, buffer, buflen, "socket:[%lu]",
dentry->d_inode->i_ino);
}
static const struct dentry_operations sockfs_dentry_operations = {
.d_dname = sockfs_dname,
};
static struct dentry *sockfs_mount(struct file_system_type *fs_type,
int flags, const char *dev_name, void *data)
{
return mount_pseudo(fs_type, "socket:", &sockfs_ops,
&sockfs_dentry_operations, SOCKFS_MAGIC);
}
static struct vfsmount *sock_mnt __read_mostly;
static struct file_system_type sock_fs_type = {
.name = "sockfs",
.mount = sockfs_mount,
.kill_sb = kill_anon_super,
};
/*
* Obtains the first available file descriptor and sets it up for use.
*
* These functions create file structures and maps them to fd space
* of the current process. On success it returns file descriptor
* and file struct implicitly stored in sock->file.
* Note that another thread may close file descriptor before we return
* from this function. We use the fact that now we do not refer
* to socket after mapping. If one day we will need it, this
* function will increment ref. count on file by 1.
*
* In any case returned fd MAY BE not valid!
* This race condition is unavoidable
* with shared fd spaces, we cannot solve it inside kernel,
* but we take care of internal coherence yet.
*/
static int sock_alloc_file(struct socket *sock, struct file **f, int flags)
{
struct qstr name = { .name = "" };
struct path path;
struct file *file;
int fd;
fd = get_unused_fd_flags(flags);
if (unlikely(fd < 0))
return fd;
path.dentry = d_alloc_pseudo(sock_mnt->mnt_sb, &name);
if (unlikely(!path.dentry)) {
put_unused_fd(fd);
return -ENOMEM;
}
path.mnt = mntget(sock_mnt);
d_instantiate(path.dentry, SOCK_INODE(sock));
SOCK_INODE(sock)->i_fop = &socket_file_ops;
file = alloc_file(&path, FMODE_READ | FMODE_WRITE,
&socket_file_ops);
if (unlikely(!file)) {
/* drop dentry, keep inode */
ihold(path.dentry->d_inode);
path_put(&path);
put_unused_fd(fd);
return -ENFILE;
}
sock->file = file;
file->f_flags = O_RDWR | (flags & O_NONBLOCK);
file->f_pos = 0;
file->private_data = sock;
*f = file;
return fd;
}
int sock_map_fd(struct socket *sock, int flags)
{
struct file *newfile;
int fd = sock_alloc_file(sock, &newfile, flags);
if (likely(fd >= 0))
fd_install(fd, newfile);
return fd;
}
EXPORT_SYMBOL(sock_map_fd);
struct socket *sock_from_file(struct file *file, int *err)
{
if (file->f_op == &socket_file_ops)
return file->private_data; /* set in sock_map_fd */
*err = -ENOTSOCK;
return NULL;
}
EXPORT_SYMBOL(sock_from_file);
/**
* sockfd_lookup - Go from a file number to its socket slot
* @fd: file handle
* @err: pointer to an error code return
*
* The file handle passed in is locked and the socket it is bound
* too is returned. If an error occurs the err pointer is overwritten
* with a negative errno code and NULL is returned. The function checks
* for both invalid handles and passing a handle which is not a socket.
*
* On a success the socket object pointer is returned.
*/
struct socket *sockfd_lookup(int fd, int *err)
{
struct file *file;
struct socket *sock;
file = fget(fd);
if (!file) {
*err = -EBADF;
return NULL;
}
sock = sock_from_file(file, err);
if (!sock)
fput(file);
return sock;
}
EXPORT_SYMBOL(sockfd_lookup);
static struct socket *sockfd_lookup_light(int fd, int *err, int *fput_needed)
{
struct file *file;
struct socket *sock;
*err = -EBADF;
file = fget_light(fd, fput_needed);
if (file) {
sock = sock_from_file(file, err);
if (sock)
return sock;
fput_light(file, *fput_needed);
}
return NULL;
}
/**
* sock_alloc - allocate a socket
*
* Allocate a new inode and socket object. The two are bound together
* and initialised. The socket is then returned. If we are out of inodes
* NULL is returned.
*/
static struct socket *sock_alloc(void)
{
struct inode *inode;
struct socket *sock;
inode = new_inode_pseudo(sock_mnt->mnt_sb);
if (!inode)
return NULL;
sock = SOCKET_I(inode);
kmemcheck_annotate_bitfield(sock, type);
inode->i_ino = get_next_ino();
inode->i_mode = S_IFSOCK | S_IRWXUGO;
inode->i_uid = current_fsuid();
inode->i_gid = current_fsgid();
this_cpu_add(sockets_in_use, 1);
return sock;
}
/*
* In theory you can't get an open on this inode, but /proc provides
* a back door. Remember to keep it shut otherwise you'll let the
* creepy crawlies in.
*/
static int sock_no_open(struct inode *irrelevant, struct file *dontcare)
{
return -ENXIO;
}
const struct file_operations bad_sock_fops = {
.owner = THIS_MODULE,
.open = sock_no_open,
.llseek = noop_llseek,
};
/**
* sock_release - close a socket
* @sock: socket to close
*
* The socket is released from the protocol stack if it has a release
* callback, and the inode is then released if the socket is bound to
* an inode not a file.
*/
void sock_release(struct socket *sock)
{
if (sock->ops) {
struct module *owner = sock->ops->owner;
sock->ops->release(sock);
sock->ops = NULL;
module_put(owner);
}
if (rcu_dereference_protected(sock->wq, 1)->fasync_list)
printk(KERN_ERR "sock_release: fasync list not empty!\n");
if (test_bit(SOCK_EXTERNALLY_ALLOCATED, &sock->flags))
return;
this_cpu_sub(sockets_in_use, 1);
if (!sock->file) {
iput(SOCK_INODE(sock));
return;
}
sock->file = NULL;
}
EXPORT_SYMBOL(sock_release);
int sock_tx_timestamp(struct sock *sk, __u8 *tx_flags)
{
*tx_flags = 0;
if (sock_flag(sk, SOCK_TIMESTAMPING_TX_HARDWARE))
*tx_flags |= SKBTX_HW_TSTAMP;
if (sock_flag(sk, SOCK_TIMESTAMPING_TX_SOFTWARE))
*tx_flags |= SKBTX_SW_TSTAMP;
if (sock_flag(sk, SOCK_WIFI_STATUS))
*tx_flags |= SKBTX_WIFI_STATUS;
return 0;
}
EXPORT_SYMBOL(sock_tx_timestamp);
static inline int __sock_sendmsg_nosec(struct kiocb *iocb, struct socket *sock,
struct msghdr *msg, size_t size)
{
struct sock_iocb *si = kiocb_to_siocb(iocb);
sock_update_classid(sock->sk);
si->sock = sock;
si->scm = NULL;
si->msg = msg;
si->size = size;
return sock->ops->sendmsg(iocb, sock, msg, size);
}
static inline int __sock_sendmsg(struct kiocb *iocb, struct socket *sock,
struct msghdr *msg, size_t size)
{
int err = security_socket_sendmsg(sock, msg, size);
return err ?: __sock_sendmsg_nosec(iocb, sock, msg, size);
}
int sock_sendmsg(struct socket *sock, struct msghdr *msg, size_t size)
{
struct kiocb iocb;
struct sock_iocb siocb;
int ret;
init_sync_kiocb(&iocb, NULL);
iocb.private = &siocb;
ret = __sock_sendmsg(&iocb, sock, msg, size);
if (-EIOCBQUEUED == ret)
ret = wait_on_sync_kiocb(&iocb);
return ret;
}
EXPORT_SYMBOL(sock_sendmsg);
static int sock_sendmsg_nosec(struct socket *sock, struct msghdr *msg, size_t size)
{
struct kiocb iocb;
struct sock_iocb siocb;
int ret;
init_sync_kiocb(&iocb, NULL);
iocb.private = &siocb;
ret = __sock_sendmsg_nosec(&iocb, sock, msg, size);
if (-EIOCBQUEUED == ret)
ret = wait_on_sync_kiocb(&iocb);
return ret;
}
int kernel_sendmsg(struct socket *sock, struct msghdr *msg,
struct kvec *vec, size_t num, size_t size)
{
mm_segment_t oldfs = get_fs();
int result;
set_fs(KERNEL_DS);
/*
* the following is safe, since for compiler definitions of kvec and
* iovec are identical, yielding the same in-core layout and alignment
*/
msg->msg_iov = (struct iovec *)vec;
msg->msg_iovlen = num;
result = sock_sendmsg(sock, msg, size);
set_fs(oldfs);
return result;
}
EXPORT_SYMBOL(kernel_sendmsg);
static int ktime2ts(ktime_t kt, struct timespec *ts)
{
if (kt.tv64) {
*ts = ktime_to_timespec(kt);
return 1;
} else {
return 0;
}
}
/*
* called from sock_recv_timestamp() if sock_flag(sk, SOCK_RCVTSTAMP)
*/
void __sock_recv_timestamp(struct msghdr *msg, struct sock *sk,
struct sk_buff *skb)
{
int need_software_tstamp = sock_flag(sk, SOCK_RCVTSTAMP);
struct timespec ts[3];
int empty = 1;
struct skb_shared_hwtstamps *shhwtstamps =
skb_hwtstamps(skb);
/* Race occurred between timestamp enabling and packet
receiving. Fill in the current time for now. */
if (need_software_tstamp && skb->tstamp.tv64 == 0)
__net_timestamp(skb);
if (need_software_tstamp) {
if (!sock_flag(sk, SOCK_RCVTSTAMPNS)) {
struct timeval tv;
skb_get_timestamp(skb, &tv);
put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMP,
sizeof(tv), &tv);
} else {
skb_get_timestampns(skb, &ts[0]);
put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMPNS,
sizeof(ts[0]), &ts[0]);
}
}
memset(ts, 0, sizeof(ts));
if (skb->tstamp.tv64 &&
sock_flag(sk, SOCK_TIMESTAMPING_SOFTWARE)) {
skb_get_timestampns(skb, ts + 0);
empty = 0;
}
if (shhwtstamps) {
if (sock_flag(sk, SOCK_TIMESTAMPING_SYS_HARDWARE) &&
ktime2ts(shhwtstamps->syststamp, ts + 1))
empty = 0;
if (sock_flag(sk, SOCK_TIMESTAMPING_RAW_HARDWARE) &&
ktime2ts(shhwtstamps->hwtstamp, ts + 2))
empty = 0;
}
if (!empty)
put_cmsg(msg, SOL_SOCKET,
SCM_TIMESTAMPING, sizeof(ts), &ts);
}
EXPORT_SYMBOL_GPL(__sock_recv_timestamp);
void __sock_recv_wifi_status(struct msghdr *msg, struct sock *sk,
struct sk_buff *skb)
{
int ack;
if (!sock_flag(sk, SOCK_WIFI_STATUS))
return;
if (!skb->wifi_acked_valid)
return;
ack = skb->wifi_acked;
put_cmsg(msg, SOL_SOCKET, SCM_WIFI_STATUS, sizeof(ack), &ack);
}
EXPORT_SYMBOL_GPL(__sock_recv_wifi_status);
static inline void sock_recv_drops(struct msghdr *msg, struct sock *sk,
struct sk_buff *skb)
{
if (sock_flag(sk, SOCK_RXQ_OVFL) && skb && skb->dropcount)
put_cmsg(msg, SOL_SOCKET, SO_RXQ_OVFL,
sizeof(__u32), &skb->dropcount);
}
void __sock_recv_ts_and_drops(struct msghdr *msg, struct sock *sk,
struct sk_buff *skb)
{
sock_recv_timestamp(msg, sk, skb);
sock_recv_drops(msg, sk, skb);
}
EXPORT_SYMBOL_GPL(__sock_recv_ts_and_drops);
static inline int __sock_recvmsg_nosec(struct kiocb *iocb, struct socket *sock,
struct msghdr *msg, size_t size, int flags)
{
struct sock_iocb *si = kiocb_to_siocb(iocb);
sock_update_classid(sock->sk);
si->sock = sock;
si->scm = NULL;
si->msg = msg;
si->size = size;
si->flags = flags;
return sock->ops->recvmsg(iocb, sock, msg, size, flags);
}
static inline int __sock_recvmsg(struct kiocb *iocb, struct socket *sock,
struct msghdr *msg, size_t size, int flags)
{
int err = security_socket_recvmsg(sock, msg, size, flags);
return err ?: __sock_recvmsg_nosec(iocb, sock, msg, size, flags);
}
int sock_recvmsg(struct socket *sock, struct msghdr *msg,
size_t size, int flags)
{
struct kiocb iocb;
struct sock_iocb siocb;
int ret;
init_sync_kiocb(&iocb, NULL);
iocb.private = &siocb;
ret = __sock_recvmsg(&iocb, sock, msg, size, flags);
if (-EIOCBQUEUED == ret)
ret = wait_on_sync_kiocb(&iocb);
return ret;
}
EXPORT_SYMBOL(sock_recvmsg);
static int sock_recvmsg_nosec(struct socket *sock, struct msghdr *msg,
size_t size, int flags)
{
struct kiocb iocb;
struct sock_iocb siocb;
int ret;
init_sync_kiocb(&iocb, NULL);
iocb.private = &siocb;
ret = __sock_recvmsg_nosec(&iocb, sock, msg, size, flags);
if (-EIOCBQUEUED == ret)
ret = wait_on_sync_kiocb(&iocb);
return ret;
}
/**
* kernel_recvmsg - Receive a message from a socket (kernel space)
* @sock: The socket to receive the message from
* @msg: Received message
* @vec: Input s/g array for message data
* @num: Size of input s/g array
* @size: Number of bytes to read
* @flags: Message flags (MSG_DONTWAIT, etc...)
*
* On return the msg structure contains the scatter/gather array passed in the
* vec argument. The array is modified so that it consists of the unfilled
* portion of the original array.
*
* The returned value is the total number of bytes received, or an error.
*/
int kernel_recvmsg(struct socket *sock, struct msghdr *msg,
struct kvec *vec, size_t num, size_t size, int flags)
{
mm_segment_t oldfs = get_fs();
int result;
set_fs(KERNEL_DS);
/*
* the following is safe, since for compiler definitions of kvec and
* iovec are identical, yielding the same in-core layout and alignment
*/
msg->msg_iov = (struct iovec *)vec, msg->msg_iovlen = num;
result = sock_recvmsg(sock, msg, size, flags);
set_fs(oldfs);
return result;
}
EXPORT_SYMBOL(kernel_recvmsg);
static void sock_aio_dtor(struct kiocb *iocb)
{
kfree(iocb->private);
}
static ssize_t sock_sendpage(struct file *file, struct page *page,
int offset, size_t size, loff_t *ppos, int more)
{
struct socket *sock;
int flags;
sock = file->private_data;
flags = (file->f_flags & O_NONBLOCK) ? MSG_DONTWAIT : 0;
/* more is a combination of MSG_MORE and MSG_SENDPAGE_NOTLAST */
flags |= more;
return kernel_sendpage(sock, page, offset, size, flags);
}
static ssize_t sock_splice_read(struct file *file, loff_t *ppos,
struct pipe_inode_info *pipe, size_t len,
unsigned int flags)
{
struct socket *sock = file->private_data;
if (unlikely(!sock->ops->splice_read))
return -EINVAL;
sock_update_classid(sock->sk);
return sock->ops->splice_read(sock, ppos, pipe, len, flags);
}
static struct sock_iocb *alloc_sock_iocb(struct kiocb *iocb,
struct sock_iocb *siocb)
{
if (!is_sync_kiocb(iocb)) {
siocb = kmalloc(sizeof(*siocb), GFP_KERNEL);
if (!siocb)
return NULL;
iocb->ki_dtor = sock_aio_dtor;
}
siocb->kiocb = iocb;
iocb->private = siocb;
return siocb;
}
static ssize_t do_sock_read(struct msghdr *msg, struct kiocb *iocb,
struct file *file, const struct iovec *iov,
unsigned long nr_segs)
{
struct socket *sock = file->private_data;
size_t size = 0;
int i;
for (i = 0; i < nr_segs; i++)
size += iov[i].iov_len;
msg->msg_name = NULL;
msg->msg_namelen = 0;
msg->msg_control = NULL;
msg->msg_controllen = 0;
msg->msg_iov = (struct iovec *)iov;
msg->msg_iovlen = nr_segs;
msg->msg_flags = (file->f_flags & O_NONBLOCK) ? MSG_DONTWAIT : 0;
return __sock_recvmsg(iocb, sock, msg, size, msg->msg_flags);
}
static ssize_t sock_aio_read(struct kiocb *iocb, const struct iovec *iov,
unsigned long nr_segs, loff_t pos)
{
struct sock_iocb siocb, *x;
if (pos != 0)
return -ESPIPE;
if (iocb->ki_left == 0) /* Match SYS5 behaviour */
return 0;
x = alloc_sock_iocb(iocb, &siocb);
if (!x)
return -ENOMEM;
return do_sock_read(&x->async_msg, iocb, iocb->ki_filp, iov, nr_segs);
}
static ssize_t do_sock_write(struct msghdr *msg, struct kiocb *iocb,
struct file *file, const struct iovec *iov,
unsigned long nr_segs)
{
struct socket *sock = file->private_data;
size_t size = 0;
int i;
for (i = 0; i < nr_segs; i++)
size += iov[i].iov_len;
msg->msg_name = NULL;
msg->msg_namelen = 0;
msg->msg_control = NULL;
msg->msg_controllen = 0;
msg->msg_iov = (struct iovec *)iov;
msg->msg_iovlen = nr_segs;
msg->msg_flags = (file->f_flags & O_NONBLOCK) ? MSG_DONTWAIT : 0;
if (sock->type == SOCK_SEQPACKET)
msg->msg_flags |= MSG_EOR;
return __sock_sendmsg(iocb, sock, msg, size);
}
static ssize_t sock_aio_write(struct kiocb *iocb, const struct iovec *iov,
unsigned long nr_segs, loff_t pos)
{
struct sock_iocb siocb, *x;
if (pos != 0)
return -ESPIPE;
x = alloc_sock_iocb(iocb, &siocb);
if (!x)
return -ENOMEM;
return do_sock_write(&x->async_msg, iocb, iocb->ki_filp, iov, nr_segs);
}
/*
* Atomic setting of ioctl hooks to avoid race
* with module unload.
*/
static DEFINE_MUTEX(br_ioctl_mutex);
static int (*br_ioctl_hook) (struct net *, unsigned int cmd, void __user *arg);
void brioctl_set(int (*hook) (struct net *, unsigned int, void __user *))
{
mutex_lock(&br_ioctl_mutex);
br_ioctl_hook = hook;
mutex_unlock(&br_ioctl_mutex);
}
EXPORT_SYMBOL(brioctl_set);
static DEFINE_MUTEX(vlan_ioctl_mutex);
static int (*vlan_ioctl_hook) (struct net *, void __user *arg);
void vlan_ioctl_set(int (*hook) (struct net *, void __user *))
{
mutex_lock(&vlan_ioctl_mutex);
vlan_ioctl_hook = hook;
mutex_unlock(&vlan_ioctl_mutex);
}
EXPORT_SYMBOL(vlan_ioctl_set);
static DEFINE_MUTEX(dlci_ioctl_mutex);
static int (*dlci_ioctl_hook) (unsigned int, void __user *);
void dlci_ioctl_set(int (*hook) (unsigned int, void __user *))
{
mutex_lock(&dlci_ioctl_mutex);
dlci_ioctl_hook = hook;
mutex_unlock(&dlci_ioctl_mutex);
}
EXPORT_SYMBOL(dlci_ioctl_set);
static long sock_do_ioctl(struct net *net, struct socket *sock,
unsigned int cmd, unsigned long arg)
{
int err;
void __user *argp = (void __user *)arg;
err = sock->ops->ioctl(sock, cmd, arg);
/*
* If this ioctl is unknown try to hand it down
* to the NIC driver.
*/
if (err == -ENOIOCTLCMD)
err = dev_ioctl(net, cmd, argp);
return err;
}
/*
* With an ioctl, arg may well be a user mode pointer, but we don't know
* what to do with it - that's up to the protocol still.
*/
static long sock_ioctl(struct file *file, unsigned cmd, unsigned long arg)
{
struct socket *sock;
struct sock *sk;
void __user *argp = (void __user *)arg;
int pid, err;
struct net *net;
sock = file->private_data;
sk = sock->sk;
net = sock_net(sk);
if (cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15)) {
err = dev_ioctl(net, cmd, argp);
} else
#ifdef CONFIG_WEXT_CORE
if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) {
err = dev_ioctl(net, cmd, argp);
} else
#endif
switch (cmd) {
case FIOSETOWN:
case SIOCSPGRP:
err = -EFAULT;
if (get_user(pid, (int __user *)argp))
break;
err = f_setown(sock->file, pid, 1);
break;
case FIOGETOWN:
case SIOCGPGRP:
err = put_user(f_getown(sock->file),
(int __user *)argp);
break;
case SIOCGIFBR:
case SIOCSIFBR:
case SIOCBRADDBR:
case SIOCBRDELBR:
err = -ENOPKG;
if (!br_ioctl_hook)
request_module("bridge");
mutex_lock(&br_ioctl_mutex);
if (br_ioctl_hook)
err = br_ioctl_hook(net, cmd, argp);
mutex_unlock(&br_ioctl_mutex);
break;
case SIOCGIFVLAN:
case SIOCSIFVLAN:
err = -ENOPKG;
if (!vlan_ioctl_hook)
request_module("8021q");
mutex_lock(&vlan_ioctl_mutex);
if (vlan_ioctl_hook)
err = vlan_ioctl_hook(net, argp);
mutex_unlock(&vlan_ioctl_mutex);
break;
case SIOCADDDLCI:
case SIOCDELDLCI:
err = -ENOPKG;
if (!dlci_ioctl_hook)
request_module("dlci");
mutex_lock(&dlci_ioctl_mutex);
if (dlci_ioctl_hook)
err = dlci_ioctl_hook(cmd, argp);
mutex_unlock(&dlci_ioctl_mutex);
break;
default:
err = sock_do_ioctl(net, sock, cmd, arg);
break;
}
return err;
}
int sock_create_lite(int family, int type, int protocol, struct socket **res)
{
int err;
struct socket *sock = NULL;
err = security_socket_create(family, type, protocol, 1);
if (err)
goto out;
sock = sock_alloc();
if (!sock) {
err = -ENOMEM;
goto out;
}
sock->type = type;
err = security_socket_post_create(sock, family, type, protocol, 1);
if (err)
goto out_release;
out:
*res = sock;
return err;
out_release:
sock_release(sock);
sock = NULL;
goto out;
}
EXPORT_SYMBOL(sock_create_lite);
/* No kernel lock held - perfect */
static unsigned int sock_poll(struct file *file, poll_table *wait)
{
struct socket *sock;
/*
* We can't return errors to poll, so it's either yes or no.
*/
sock = file->private_data;
return sock->ops->poll(file, sock, wait);
}
static int sock_mmap(struct file *file, struct vm_area_struct *vma)
{
struct socket *sock = file->private_data;
return sock->ops->mmap(file, sock, vma);
}
static int sock_close(struct inode *inode, struct file *filp)
{
/*
* It was possible the inode is NULL we were
* closing an unfinished socket.
*/
if (!inode) {
printk(KERN_DEBUG "sock_close: NULL inode\n");
return 0;
}
sock_release(SOCKET_I(inode));
return 0;
}
/*
* Update the socket async list
*
* Fasync_list locking strategy.
*
* 1. fasync_list is modified only under process context socket lock
* i.e. under semaphore.
* 2. fasync_list is used under read_lock(&sk->sk_callback_lock)
* or under socket lock
*/
static int sock_fasync(int fd, struct file *filp, int on)
{
struct socket *sock = filp->private_data;
struct sock *sk = sock->sk;
struct socket_wq *wq;
if (sk == NULL)
return -EINVAL;
lock_sock(sk);
wq = rcu_dereference_protected(sock->wq, sock_owned_by_user(sk));
fasync_helper(fd, filp, on, &wq->fasync_list);
if (!wq->fasync_list)
sock_reset_flag(sk, SOCK_FASYNC);
else
sock_set_flag(sk, SOCK_FASYNC);
release_sock(sk);
return 0;
}
/* This function may be called only under socket lock or callback_lock or rcu_lock */
int sock_wake_async(struct socket *sock, int how, int band)
{
struct socket_wq *wq;
if (!sock)
return -1;
rcu_read_lock();
wq = rcu_dereference(sock->wq);
if (!wq || !wq->fasync_list) {
rcu_read_unlock();
return -1;
}
switch (how) {
case SOCK_WAKE_WAITD:
if (test_bit(SOCK_ASYNC_WAITDATA, &sock->flags))
break;
goto call_kill;
case SOCK_WAKE_SPACE:
if (!test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags))
break;
/* fall through */
case SOCK_WAKE_IO:
call_kill:
kill_fasync(&wq->fasync_list, SIGIO, band);
break;
case SOCK_WAKE_URG:
kill_fasync(&wq->fasync_list, SIGURG, band);
}
rcu_read_unlock();
return 0;
}
EXPORT_SYMBOL(sock_wake_async);
int __sock_create(struct net *net, int family, int type, int protocol,
struct socket **res, int kern)
{
int err;
struct socket *sock;
const struct net_proto_family *pf;
/*
* Check protocol is in range
*/
if (family < 0 || family >= NPROTO)
return -EAFNOSUPPORT;
if (type < 0 || type >= SOCK_MAX)
return -EINVAL;
/* Compatibility.
This uglymoron is moved from INET layer to here to avoid
deadlock in module load.
*/
if (family == PF_INET && type == SOCK_PACKET) {
static int warned;
if (!warned) {
warned = 1;
printk(KERN_INFO "%s uses obsolete (PF_INET,SOCK_PACKET)\n",
current->comm);
}
family = PF_PACKET;
}
err = security_socket_create(family, type, protocol, kern);
if (err)
return err;
/*
* Allocate the socket and allow the family to set things up. if
* the protocol is 0, the family is instructed to select an appropriate
* default.
*/
sock = sock_alloc();
if (!sock) {
net_warn_ratelimited("socket: no more sockets\n");
return -ENFILE; /* Not exactly a match, but its the
closest posix thing */
}
sock->type = type;
#ifdef CONFIG_MODULES
/* Attempt to load a protocol module if the find failed.
*
* 12/09/1996 Marcin: But! this makes REALLY only sense, if the user
* requested real, full-featured networking support upon configuration.
* Otherwise module support will break!
*/
if (rcu_access_pointer(net_families[family]) == NULL)
request_module("net-pf-%d", family);
#endif
rcu_read_lock();
pf = rcu_dereference(net_families[family]);
err = -EAFNOSUPPORT;
if (!pf)
goto out_release;
/*
* We will call the ->create function, that possibly is in a loadable
* module, so we have to bump that loadable module refcnt first.
*/
if (!try_module_get(pf->owner))
goto out_release;
/* Now protected by module ref count */
rcu_read_unlock();
err = pf->create(net, sock, protocol, kern);
if (err < 0)
goto out_module_put;
/*
* Now to bump the refcnt of the [loadable] module that owns this
* socket at sock_release time we decrement its refcnt.
*/
if (!try_module_get(sock->ops->owner))
goto out_module_busy;
/*
* Now that we're done with the ->create function, the [loadable]
* module can have its refcnt decremented
*/
module_put(pf->owner);
err = security_socket_post_create(sock, family, type, protocol, kern);
if (err)
goto out_sock_release;
*res = sock;
return 0;
out_module_busy:
err = -EAFNOSUPPORT;
out_module_put:
sock->ops = NULL;
module_put(pf->owner);
out_sock_release:
sock_release(sock);
return err;
out_release:
rcu_read_unlock();
goto out_sock_release;
}
EXPORT_SYMBOL(__sock_create);
int sock_create(int family, int type, int protocol, struct socket **res)
{
return __sock_create(current->nsproxy->net_ns, family, type, protocol, res, 0);
}
EXPORT_SYMBOL(sock_create);
int sock_create_kern(int family, int type, int protocol, struct socket **res)
{
return __sock_create(&init_net, family, type, protocol, res, 1);
}
EXPORT_SYMBOL(sock_create_kern);
SYSCALL_DEFINE3(socket, int, family, int, type, int, protocol)
{
int retval;
struct socket *sock;
int flags;
/* Check the SOCK_* constants for consistency. */
BUILD_BUG_ON(SOCK_CLOEXEC != O_CLOEXEC);
BUILD_BUG_ON((SOCK_MAX | SOCK_TYPE_MASK) != SOCK_TYPE_MASK);
BUILD_BUG_ON(SOCK_CLOEXEC & SOCK_TYPE_MASK);
BUILD_BUG_ON(SOCK_NONBLOCK & SOCK_TYPE_MASK);
flags = type & ~SOCK_TYPE_MASK;
if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK))
return -EINVAL;
type &= SOCK_TYPE_MASK;
if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK))
flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK;
retval = sock_create(family, type, protocol, &sock);
if (retval < 0)
goto out;
retval = sock_map_fd(sock, flags & (O_CLOEXEC | O_NONBLOCK));
if (retval < 0)
goto out_release;
out:
/* It may be already another descriptor 8) Not kernel problem. */
return retval;
out_release:
sock_release(sock);
return retval;
}
/*
* Create a pair of connected sockets.
*/
SYSCALL_DEFINE4(socketpair, int, family, int, type, int, protocol,
int __user *, usockvec)
{
struct socket *sock1, *sock2;
int fd1, fd2, err;
struct file *newfile1, *newfile2;
int flags;
flags = type & ~SOCK_TYPE_MASK;
if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK))
return -EINVAL;
type &= SOCK_TYPE_MASK;
if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK))
flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK;
/*
* Obtain the first socket and check if the underlying protocol
* supports the socketpair call.
*/
err = sock_create(family, type, protocol, &sock1);
if (err < 0)
goto out;
err = sock_create(family, type, protocol, &sock2);
if (err < 0)
goto out_release_1;
err = sock1->ops->socketpair(sock1, sock2);
if (err < 0)
goto out_release_both;
fd1 = sock_alloc_file(sock1, &newfile1, flags);
if (unlikely(fd1 < 0)) {
err = fd1;
goto out_release_both;
}
fd2 = sock_alloc_file(sock2, &newfile2, flags);
if (unlikely(fd2 < 0)) {
err = fd2;
fput(newfile1);
put_unused_fd(fd1);
sock_release(sock2);
goto out;
}
audit_fd_pair(fd1, fd2);
fd_install(fd1, newfile1);
fd_install(fd2, newfile2);
/* fd1 and fd2 may be already another descriptors.
* Not kernel problem.
*/
err = put_user(fd1, &usockvec[0]);
if (!err)
err = put_user(fd2, &usockvec[1]);
if (!err)
return 0;
sys_close(fd2);
sys_close(fd1);
return err;
out_release_both:
sock_release(sock2);
out_release_1:
sock_release(sock1);
out:
return err;
}
/*
* Bind a name to a socket. Nothing much to do here since it's
* the protocol's responsibility to handle the local address.
*
* We move the socket address to kernel space before we call
* the protocol layer (having also checked the address is ok).
*/
SYSCALL_DEFINE3(bind, int, fd, struct sockaddr __user *, umyaddr, int, addrlen)
{
struct socket *sock;
struct sockaddr_storage address;
int err, fput_needed;
sock = sockfd_lookup_light(fd, &err, &fput_needed);
if (sock) {
err = move_addr_to_kernel(umyaddr, addrlen, &address);
if (err >= 0) {
err = security_socket_bind(sock,
(struct sockaddr *)&address,
addrlen);
if (!err)
err = sock->ops->bind(sock,
(struct sockaddr *)
&address, addrlen);
}
fput_light(sock->file, fput_needed);
}
return err;
}
/*
* Perform a listen. Basically, we allow the protocol to do anything
* necessary for a listen, and if that works, we mark the socket as
* ready for listening.
*/
SYSCALL_DEFINE2(listen, int, fd, int, backlog)
{
struct socket *sock;
int err, fput_needed;
int somaxconn;
sock = sockfd_lookup_light(fd, &err, &fput_needed);
if (sock) {
somaxconn = sock_net(sock->sk)->core.sysctl_somaxconn;
if ((unsigned int)backlog > somaxconn)
backlog = somaxconn;
err = security_socket_listen(sock, backlog);
if (!err)
err = sock->ops->listen(sock, backlog);
fput_light(sock->file, fput_needed);
}
return err;
}
/*
* For accept, we attempt to create a new socket, set up the link
* with the client, wake up the client, then return the new
* connected fd. We collect the address of the connector in kernel
* space and move it to user at the very end. This is unclean because
* we open the socket then return an error.
*
* 1003.1g adds the ability to recvmsg() to query connection pending
* status to recvmsg. We need to add that support in a way thats
* clean when we restucture accept also.
*/
SYSCALL_DEFINE4(accept4, int, fd, struct sockaddr __user *, upeer_sockaddr,
int __user *, upeer_addrlen, int, flags)
{
struct socket *sock, *newsock;
struct file *newfile;
int err, len, newfd, fput_needed;
struct sockaddr_storage address;
if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK))
return -EINVAL;
if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK))
flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK;
sock = sockfd_lookup_light(fd, &err, &fput_needed);
if (!sock)
goto out;
err = -ENFILE;
newsock = sock_alloc();
if (!newsock)
goto out_put;
newsock->type = sock->type;
newsock->ops = sock->ops;
/*
* We don't need try_module_get here, as the listening socket (sock)
* has the protocol module (sock->ops->owner) held.
*/
__module_get(newsock->ops->owner);
newfd = sock_alloc_file(newsock, &newfile, flags);
if (unlikely(newfd < 0)) {
err = newfd;
sock_release(newsock);
goto out_put;
}
err = security_socket_accept(sock, newsock);
if (err)
goto out_fd;
err = sock->ops->accept(sock, newsock, sock->file->f_flags);
if (err < 0)
goto out_fd;
if (upeer_sockaddr) {
if (newsock->ops->getname(newsock, (struct sockaddr *)&address,
&len, 2) < 0) {
err = -ECONNABORTED;
goto out_fd;
}
err = move_addr_to_user(&address,
len, upeer_sockaddr, upeer_addrlen);
if (err < 0)
goto out_fd;
}
/* File flags are not inherited via accept() unlike another OSes. */
fd_install(newfd, newfile);
err = newfd;
out_put:
fput_light(sock->file, fput_needed);
out:
return err;
out_fd:
fput(newfile);
put_unused_fd(newfd);
goto out_put;
}
SYSCALL_DEFINE3(accept, int, fd, struct sockaddr __user *, upeer_sockaddr,
int __user *, upeer_addrlen)
{
return sys_accept4(fd, upeer_sockaddr, upeer_addrlen, 0);
}
/*
* Attempt to connect to a socket with the server address. The address
* is in user space so we verify it is OK and move it to kernel space.
*
* For 1003.1g we need to add clean support for a bind to AF_UNSPEC to
* break bindings
*
* NOTE: 1003.1g draft 6.3 is broken with respect to AX.25/NetROM and
* other SEQPACKET protocols that take time to connect() as it doesn't
* include the -EINPROGRESS status for such sockets.
*/
SYSCALL_DEFINE3(connect, int, fd, struct sockaddr __user *, uservaddr,
int, addrlen)
{
struct socket *sock;
struct sockaddr_storage address;
int err, fput_needed;
sock = sockfd_lookup_light(fd, &err, &fput_needed);
if (!sock)
goto out;
err = move_addr_to_kernel(uservaddr, addrlen, &address);
if (err < 0)
goto out_put;
err =
security_socket_connect(sock, (struct sockaddr *)&address, addrlen);
if (err)
goto out_put;
err = sock->ops->connect(sock, (struct sockaddr *)&address, addrlen,
sock->file->f_flags);
out_put:
fput_light(sock->file, fput_needed);
out:
return err;
}
/*
* Get the local address ('name') of a socket object. Move the obtained
* name to user space.
*/
SYSCALL_DEFINE3(getsockname, int, fd, struct sockaddr __user *, usockaddr,
int __user *, usockaddr_len)
{
struct socket *sock;
struct sockaddr_storage address;
int len, err, fput_needed;
sock = sockfd_lookup_light(fd, &err, &fput_needed);
if (!sock)
goto out;
err = security_socket_getsockname(sock);
if (err)
goto out_put;
err = sock->ops->getname(sock, (struct sockaddr *)&address, &len, 0);
if (err)
goto out_put;
err = move_addr_to_user(&address, len, usockaddr, usockaddr_len);
out_put:
fput_light(sock->file, fput_needed);
out:
return err;
}
/*
* Get the remote address ('name') of a socket object. Move the obtained
* name to user space.
*/
SYSCALL_DEFINE3(getpeername, int, fd, struct sockaddr __user *, usockaddr,
int __user *, usockaddr_len)
{
struct socket *sock;
struct sockaddr_storage address;
int len, err, fput_needed;
sock = sockfd_lookup_light(fd, &err, &fput_needed);
if (sock != NULL) {
err = security_socket_getpeername(sock);
if (err) {
fput_light(sock->file, fput_needed);
return err;
}
err =
sock->ops->getname(sock, (struct sockaddr *)&address, &len,
1);
if (!err)
err = move_addr_to_user(&address, len, usockaddr,
usockaddr_len);
fput_light(sock->file, fput_needed);
}
return err;
}
/*
* Send a datagram to a given address. We move the address into kernel
* space and check the user space data area is readable before invoking
* the protocol.
*/
SYSCALL_DEFINE6(sendto, int, fd, void __user *, buff, size_t, len,
unsigned int, flags, struct sockaddr __user *, addr,
int, addr_len)
{
struct socket *sock;
struct sockaddr_storage address;
int err;
struct msghdr msg;
struct iovec iov;
int fput_needed;
if (len > INT_MAX)
len = INT_MAX;
sock = sockfd_lookup_light(fd, &err, &fput_needed);
if (!sock)
goto out;
iov.iov_base = buff;
iov.iov_len = len;
msg.msg_name = NULL;
msg.msg_iov = &iov;
msg.msg_iovlen = 1;
msg.msg_control = NULL;
msg.msg_controllen = 0;
msg.msg_namelen = 0;
if (addr) {
err = move_addr_to_kernel(addr, addr_len, &address);
if (err < 0)
goto out_put;
msg.msg_name = (struct sockaddr *)&address;
msg.msg_namelen = addr_len;
}
if (sock->file->f_flags & O_NONBLOCK)
flags |= MSG_DONTWAIT;
msg.msg_flags = flags;
err = sock_sendmsg(sock, &msg, len);
out_put:
fput_light(sock->file, fput_needed);
out:
return err;
}
/*
* Send a datagram down a socket.
*/
SYSCALL_DEFINE4(send, int, fd, void __user *, buff, size_t, len,
unsigned int, flags)
{
return sys_sendto(fd, buff, len, flags, NULL, 0);
}
/*
* Receive a frame from the socket and optionally record the address of the
* sender. We verify the buffers are writable and if needed move the
* sender address from kernel to user space.
*/
SYSCALL_DEFINE6(recvfrom, int, fd, void __user *, ubuf, size_t, size,
unsigned int, flags, struct sockaddr __user *, addr,
int __user *, addr_len)
{
struct socket *sock;
struct iovec iov;
struct msghdr msg;
struct sockaddr_storage address;
int err, err2;
int fput_needed;
if (size > INT_MAX)
size = INT_MAX;
sock = sockfd_lookup_light(fd, &err, &fput_needed);
if (!sock)
goto out;
msg.msg_control = NULL;
msg.msg_controllen = 0;
msg.msg_iovlen = 1;
msg.msg_iov = &iov;
iov.iov_len = size;
iov.iov_base = ubuf;
msg.msg_name = (struct sockaddr *)&address;
msg.msg_namelen = sizeof(address);
if (sock->file->f_flags & O_NONBLOCK)
flags |= MSG_DONTWAIT;
err = sock_recvmsg(sock, &msg, size, flags);
if (err >= 0 && addr != NULL) {
err2 = move_addr_to_user(&address,
msg.msg_namelen, addr, addr_len);
if (err2 < 0)
err = err2;
}
fput_light(sock->file, fput_needed);
out:
return err;
}
/*
* Receive a datagram from a socket.
*/
asmlinkage long sys_recv(int fd, void __user *ubuf, size_t size,
unsigned int flags)
{
return sys_recvfrom(fd, ubuf, size, flags, NULL, NULL);
}
/*
* Set a socket option. Because we don't know the option lengths we have
* to pass the user mode parameter for the protocols to sort out.
*/
SYSCALL_DEFINE5(setsockopt, int, fd, int, level, int, optname,
char __user *, optval, int, optlen)
{
int err, fput_needed;
struct socket *sock;
if (optlen < 0)
return -EINVAL;
sock = sockfd_lookup_light(fd, &err, &fput_needed);
if (sock != NULL) {
err = security_socket_setsockopt(sock, level, optname);
if (err)
goto out_put;
if (level == SOL_SOCKET)
err =
sock_setsockopt(sock, level, optname, optval,
optlen);
else
err =
sock->ops->setsockopt(sock, level, optname, optval,
optlen);
out_put:
fput_light(sock->file, fput_needed);
}
return err;
}
/*
* Get a socket option. Because we don't know the option lengths we have
* to pass a user mode parameter for the protocols to sort out.
*/
SYSCALL_DEFINE5(getsockopt, int, fd, int, level, int, optname,
char __user *, optval, int __user *, optlen)
{
int err, fput_needed;
struct socket *sock;
sock = sockfd_lookup_light(fd, &err, &fput_needed);
if (sock != NULL) {
err = security_socket_getsockopt(sock, level, optname);
if (err)
goto out_put;
if (level == SOL_SOCKET)
err =
sock_getsockopt(sock, level, optname, optval,
optlen);
else
err =
sock->ops->getsockopt(sock, level, optname, optval,
optlen);
out_put:
fput_light(sock->file, fput_needed);
}
return err;
}
/*
* Shutdown a socket.
*/
SYSCALL_DEFINE2(shutdown, int, fd, int, how)
{
int err, fput_needed;
struct socket *sock;
sock = sockfd_lookup_light(fd, &err, &fput_needed);
if (sock != NULL) {
err = security_socket_shutdown(sock, how);
if (!err)
err = sock->ops->shutdown(sock, how);
fput_light(sock->file, fput_needed);
}
return err;
}
/* A couple of helpful macros for getting the address of the 32/64 bit
* fields which are the same type (int / unsigned) on our platforms.
*/
#define COMPAT_MSG(msg, member) ((MSG_CMSG_COMPAT & flags) ? &msg##_compat->member : &msg->member)
#define COMPAT_NAMELEN(msg) COMPAT_MSG(msg, msg_namelen)
#define COMPAT_FLAGS(msg) COMPAT_MSG(msg, msg_flags)
struct used_address {
struct sockaddr_storage name;
unsigned int name_len;
};
static int __sys_sendmsg(struct socket *sock, struct msghdr __user *msg,
struct msghdr *msg_sys, unsigned int flags,
struct used_address *used_address)
{
struct compat_msghdr __user *msg_compat =
(struct compat_msghdr __user *)msg;
struct sockaddr_storage address;
struct iovec iovstack[UIO_FASTIOV], *iov = iovstack;
unsigned char ctl[sizeof(struct cmsghdr) + 20]
__attribute__ ((aligned(sizeof(__kernel_size_t))));
/* 20 is size of ipv6_pktinfo */
unsigned char *ctl_buf = ctl;
int err, ctl_len, total_len;
err = -EFAULT;
if (MSG_CMSG_COMPAT & flags) {
if (get_compat_msghdr(msg_sys, msg_compat))
return -EFAULT;
} else if (copy_from_user(msg_sys, msg, sizeof(struct msghdr)))
return -EFAULT;
if (msg_sys->msg_iovlen > UIO_FASTIOV) {
err = -EMSGSIZE;
if (msg_sys->msg_iovlen > UIO_MAXIOV)
goto out;
err = -ENOMEM;
iov = kmalloc(msg_sys->msg_iovlen * sizeof(struct iovec),
GFP_KERNEL);
if (!iov)
goto out;
}
/* This will also move the address data into kernel space */
if (MSG_CMSG_COMPAT & flags) {
err = verify_compat_iovec(msg_sys, iov, &address, VERIFY_READ);
} else
err = verify_iovec(msg_sys, iov, &address, VERIFY_READ);
if (err < 0)
goto out_freeiov;
total_len = err;
err = -ENOBUFS;
if (msg_sys->msg_controllen > INT_MAX)
goto out_freeiov;
ctl_len = msg_sys->msg_controllen;
if ((MSG_CMSG_COMPAT & flags) && ctl_len) {
err =
cmsghdr_from_user_compat_to_kern(msg_sys, sock->sk, ctl,
sizeof(ctl));
if (err)
goto out_freeiov;
ctl_buf = msg_sys->msg_control;
ctl_len = msg_sys->msg_controllen;
} else if (ctl_len) {
if (ctl_len > sizeof(ctl)) {
ctl_buf = sock_kmalloc(sock->sk, ctl_len, GFP_KERNEL);
if (ctl_buf == NULL)
goto out_freeiov;
}
err = -EFAULT;
/*
* Careful! Before this, msg_sys->msg_control contains a user pointer.
* Afterwards, it will be a kernel pointer. Thus the compiler-assisted
* checking falls down on this.
*/
if (copy_from_user(ctl_buf,
(void __user __force *)msg_sys->msg_control,
ctl_len))
goto out_freectl;
msg_sys->msg_control = ctl_buf;
}
msg_sys->msg_flags = flags;
if (sock->file->f_flags & O_NONBLOCK)
msg_sys->msg_flags |= MSG_DONTWAIT;
/*
* If this is sendmmsg() and current destination address is same as
* previously succeeded address, omit asking LSM's decision.
* used_address->name_len is initialized to UINT_MAX so that the first
* destination address never matches.
*/
if (used_address && msg_sys->msg_name &&
used_address->name_len == msg_sys->msg_namelen &&
!memcmp(&used_address->name, msg_sys->msg_name,
used_address->name_len)) {
err = sock_sendmsg_nosec(sock, msg_sys, total_len);
goto out_freectl;
}
err = sock_sendmsg(sock, msg_sys, total_len);
/*
* If this is sendmmsg() and sending to current destination address was
* successful, remember it.
*/
if (used_address && err >= 0) {
used_address->name_len = msg_sys->msg_namelen;
if (msg_sys->msg_name)
memcpy(&used_address->name, msg_sys->msg_name,
used_address->name_len);
}
out_freectl:
if (ctl_buf != ctl)
sock_kfree_s(sock->sk, ctl_buf, ctl_len);
out_freeiov:
if (iov != iovstack)
kfree(iov);
out:
return err;
}
/*
* BSD sendmsg interface
*/
SYSCALL_DEFINE3(sendmsg, int, fd, struct msghdr __user *, msg, unsigned int, flags)
{
int fput_needed, err;
struct msghdr msg_sys;
struct socket *sock = sockfd_lookup_light(fd, &err, &fput_needed);
if (!sock)
goto out;
err = __sys_sendmsg(sock, msg, &msg_sys, flags, NULL);
fput_light(sock->file, fput_needed);
out:
return err;
}
/*
* Linux sendmmsg interface
*/
int __sys_sendmmsg(int fd, struct mmsghdr __user *mmsg, unsigned int vlen,
unsigned int flags)
{
int fput_needed, err, datagrams;
struct socket *sock;
struct mmsghdr __user *entry;
struct compat_mmsghdr __user *compat_entry;
struct msghdr msg_sys;
struct used_address used_address;
if (vlen > UIO_MAXIOV)
vlen = UIO_MAXIOV;
datagrams = 0;
sock = sockfd_lookup_light(fd, &err, &fput_needed);
if (!sock)
return err;
used_address.name_len = UINT_MAX;
entry = mmsg;
compat_entry = (struct compat_mmsghdr __user *)mmsg;
err = 0;
while (datagrams < vlen) {
if (MSG_CMSG_COMPAT & flags) {
err = __sys_sendmsg(sock, (struct msghdr __user *)compat_entry,
&msg_sys, flags, &used_address);
if (err < 0)
break;
err = __put_user(err, &compat_entry->msg_len);
++compat_entry;
} else {
err = __sys_sendmsg(sock, (struct msghdr __user *)entry,
&msg_sys, flags, &used_address);
if (err < 0)
break;
err = put_user(err, &entry->msg_len);
++entry;
}
if (err)
break;
++datagrams;
}
fput_light(sock->file, fput_needed);
/* We only return an error if no datagrams were able to be sent */
if (datagrams != 0)
return datagrams;
return err;
}
SYSCALL_DEFINE4(sendmmsg, int, fd, struct mmsghdr __user *, mmsg,
unsigned int, vlen, unsigned int, flags)
{
return __sys_sendmmsg(fd, mmsg, vlen, flags);
}
static int __sys_recvmsg(struct socket *sock, struct msghdr __user *msg,
struct msghdr *msg_sys, unsigned int flags, int nosec)
{
struct compat_msghdr __user *msg_compat =
(struct compat_msghdr __user *)msg;
struct iovec iovstack[UIO_FASTIOV];
struct iovec *iov = iovstack;
unsigned long cmsg_ptr;
int err, total_len, len;
/* kernel mode address */
struct sockaddr_storage addr;
/* user mode address pointers */
struct sockaddr __user *uaddr;
int __user *uaddr_len;
if (MSG_CMSG_COMPAT & flags) {
if (get_compat_msghdr(msg_sys, msg_compat))
return -EFAULT;
} else if (copy_from_user(msg_sys, msg, sizeof(struct msghdr)))
return -EFAULT;
if (msg_sys->msg_iovlen > UIO_FASTIOV) {
err = -EMSGSIZE;
if (msg_sys->msg_iovlen > UIO_MAXIOV)
goto out;
err = -ENOMEM;
iov = kmalloc(msg_sys->msg_iovlen * sizeof(struct iovec),
GFP_KERNEL);
if (!iov)
goto out;
}
/*
* Save the user-mode address (verify_iovec will change the
* kernel msghdr to use the kernel address space)
*/
uaddr = (__force void __user *)msg_sys->msg_name;
uaddr_len = COMPAT_NAMELEN(msg);
if (MSG_CMSG_COMPAT & flags) {
err = verify_compat_iovec(msg_sys, iov, &addr, VERIFY_WRITE);
} else
err = verify_iovec(msg_sys, iov, &addr, VERIFY_WRITE);
if (err < 0)
goto out_freeiov;
total_len = err;
cmsg_ptr = (unsigned long)msg_sys->msg_control;
msg_sys->msg_flags = flags & (MSG_CMSG_CLOEXEC|MSG_CMSG_COMPAT);
if (sock->file->f_flags & O_NONBLOCK)
flags |= MSG_DONTWAIT;
err = (nosec ? sock_recvmsg_nosec : sock_recvmsg)(sock, msg_sys,
total_len, flags);
if (err < 0)
goto out_freeiov;
len = err;
if (uaddr != NULL) {
err = move_addr_to_user(&addr,
msg_sys->msg_namelen, uaddr,
uaddr_len);
if (err < 0)
goto out_freeiov;
}
err = __put_user((msg_sys->msg_flags & ~MSG_CMSG_COMPAT),
COMPAT_FLAGS(msg));
if (err)
goto out_freeiov;
if (MSG_CMSG_COMPAT & flags)
err = __put_user((unsigned long)msg_sys->msg_control - cmsg_ptr,
&msg_compat->msg_controllen);
else
err = __put_user((unsigned long)msg_sys->msg_control - cmsg_ptr,
&msg->msg_controllen);
if (err)
goto out_freeiov;
err = len;
out_freeiov:
if (iov != iovstack)
kfree(iov);
out:
return err;
}
/*
* BSD recvmsg interface
*/
SYSCALL_DEFINE3(recvmsg, int, fd, struct msghdr __user *, msg,
unsigned int, flags)
{
int fput_needed, err;
struct msghdr msg_sys;
struct socket *sock = sockfd_lookup_light(fd, &err, &fput_needed);
if (!sock)
goto out;
err = __sys_recvmsg(sock, msg, &msg_sys, flags, 0);
fput_light(sock->file, fput_needed);
out:
return err;
}
/*
* Linux recvmmsg interface
*/
int __sys_recvmmsg(int fd, struct mmsghdr __user *mmsg, unsigned int vlen,
unsigned int flags, struct timespec *timeout)
{
int fput_needed, err, datagrams;
struct socket *sock;
struct mmsghdr __user *entry;
struct compat_mmsghdr __user *compat_entry;
struct msghdr msg_sys;
struct timespec end_time;
if (timeout &&
poll_select_set_timeout(&end_time, timeout->tv_sec,
timeout->tv_nsec))
return -EINVAL;
datagrams = 0;
sock = sockfd_lookup_light(fd, &err, &fput_needed);
if (!sock)
return err;
err = sock_error(sock->sk);
if (err)
goto out_put;
entry = mmsg;
compat_entry = (struct compat_mmsghdr __user *)mmsg;
while (datagrams < vlen) {
/*
* No need to ask LSM for more than the first datagram.
*/
if (MSG_CMSG_COMPAT & flags) {
err = __sys_recvmsg(sock, (struct msghdr __user *)compat_entry,
&msg_sys, flags & ~MSG_WAITFORONE,
datagrams);
if (err < 0)
break;
err = __put_user(err, &compat_entry->msg_len);
++compat_entry;
} else {
err = __sys_recvmsg(sock, (struct msghdr __user *)entry,
&msg_sys, flags & ~MSG_WAITFORONE,
datagrams);
if (err < 0)
break;
err = put_user(err, &entry->msg_len);
++entry;
}
if (err)
break;
++datagrams;
/* MSG_WAITFORONE turns on MSG_DONTWAIT after one packet */
if (flags & MSG_WAITFORONE)
flags |= MSG_DONTWAIT;
if (timeout) {
ktime_get_ts(timeout);
*timeout = timespec_sub(end_time, *timeout);
if (timeout->tv_sec < 0) {
timeout->tv_sec = timeout->tv_nsec = 0;
break;
}
/* Timeout, return less than vlen datagrams */
if (timeout->tv_nsec == 0 && timeout->tv_sec == 0)
break;
}
/* Out of band data, return right away */
if (msg_sys.msg_flags & MSG_OOB)
break;
}
out_put:
fput_light(sock->file, fput_needed);
if (err == 0)
return datagrams;
if (datagrams != 0) {
/*
* We may return less entries than requested (vlen) if the
* sock is non block and there aren't enough datagrams...
*/
if (err != -EAGAIN) {
/*
* ... or if recvmsg returns an error after we
* received some datagrams, where we record the
* error to return on the next call or if the
* app asks about it using getsockopt(SO_ERROR).
*/
sock->sk->sk_err = -err;
}
return datagrams;
}
return err;
}
SYSCALL_DEFINE5(recvmmsg, int, fd, struct mmsghdr __user *, mmsg,
unsigned int, vlen, unsigned int, flags,
struct timespec __user *, timeout)
{
int datagrams;
struct timespec timeout_sys;
if (!timeout)
return __sys_recvmmsg(fd, mmsg, vlen, flags, NULL);
if (copy_from_user(&timeout_sys, timeout, sizeof(timeout_sys)))
return -EFAULT;
datagrams = __sys_recvmmsg(fd, mmsg, vlen, flags, &timeout_sys);
if (datagrams > 0 &&
copy_to_user(timeout, &timeout_sys, sizeof(timeout_sys)))
datagrams = -EFAULT;
return datagrams;
}
#ifdef __ARCH_WANT_SYS_SOCKETCALL
/* Argument list sizes for sys_socketcall */
#define AL(x) ((x) * sizeof(unsigned long))
static const unsigned char nargs[21] = {
AL(0), AL(3), AL(3), AL(3), AL(2), AL(3),
AL(3), AL(3), AL(4), AL(4), AL(4), AL(6),
AL(6), AL(2), AL(5), AL(5), AL(3), AL(3),
AL(4), AL(5), AL(4)
};
#undef AL
/*
* System call vectors.
*
* Argument checking cleaned up. Saved 20% in size.
* This function doesn't need to set the kernel lock because
* it is set by the callees.
*/
SYSCALL_DEFINE2(socketcall, int, call, unsigned long __user *, args)
{
unsigned long a[6];
unsigned long a0, a1;
int err;
unsigned int len;
if (call < 1 || call > SYS_SENDMMSG)
return -EINVAL;
len = nargs[call];
if (len > sizeof(a))
return -EINVAL;
/* copy_from_user should be SMP safe. */
if (copy_from_user(a, args, len))
return -EFAULT;
audit_socketcall(nargs[call] / sizeof(unsigned long), a);
a0 = a[0];
a1 = a[1];
switch (call) {
case SYS_SOCKET:
err = sys_socket(a0, a1, a[2]);
break;
case SYS_BIND:
err = sys_bind(a0, (struct sockaddr __user *)a1, a[2]);
break;
case SYS_CONNECT:
err = sys_connect(a0, (struct sockaddr __user *)a1, a[2]);
break;
case SYS_LISTEN:
err = sys_listen(a0, a1);
break;
case SYS_ACCEPT:
err = sys_accept4(a0, (struct sockaddr __user *)a1,
(int __user *)a[2], 0);
break;
case SYS_GETSOCKNAME:
err =
sys_getsockname(a0, (struct sockaddr __user *)a1,
(int __user *)a[2]);
break;
case SYS_GETPEERNAME:
err =
sys_getpeername(a0, (struct sockaddr __user *)a1,
(int __user *)a[2]);
break;
case SYS_SOCKETPAIR:
err = sys_socketpair(a0, a1, a[2], (int __user *)a[3]);
break;
case SYS_SEND:
err = sys_send(a0, (void __user *)a1, a[2], a[3]);
break;
case SYS_SENDTO:
err = sys_sendto(a0, (void __user *)a1, a[2], a[3],
(struct sockaddr __user *)a[4], a[5]);
break;
case SYS_RECV:
err = sys_recv(a0, (void __user *)a1, a[2], a[3]);
break;
case SYS_RECVFROM:
err = sys_recvfrom(a0, (void __user *)a1, a[2], a[3],
(struct sockaddr __user *)a[4],
(int __user *)a[5]);
break;
case SYS_SHUTDOWN:
err = sys_shutdown(a0, a1);
break;
case SYS_SETSOCKOPT:
err = sys_setsockopt(a0, a1, a[2], (char __user *)a[3], a[4]);
break;
case SYS_GETSOCKOPT:
err =
sys_getsockopt(a0, a1, a[2], (char __user *)a[3],
(int __user *)a[4]);
break;
case SYS_SENDMSG:
err = sys_sendmsg(a0, (struct msghdr __user *)a1, a[2]);
break;
case SYS_SENDMMSG:
err = sys_sendmmsg(a0, (struct mmsghdr __user *)a1, a[2], a[3]);
break;
case SYS_RECVMSG:
err = sys_recvmsg(a0, (struct msghdr __user *)a1, a[2]);
break;
case SYS_RECVMMSG:
err = sys_recvmmsg(a0, (struct mmsghdr __user *)a1, a[2], a[3],
(struct timespec __user *)a[4]);
break;
case SYS_ACCEPT4:
err = sys_accept4(a0, (struct sockaddr __user *)a1,
(int __user *)a[2], a[3]);
break;
default:
err = -EINVAL;
break;
}
return err;
}
#endif /* __ARCH_WANT_SYS_SOCKETCALL */
/**
* sock_register - add a socket protocol handler
* @ops: description of protocol
*
* This function is called by a protocol handler that wants to
* advertise its address family, and have it linked into the
* socket interface. The value ops->family coresponds to the
* socket system call protocol family.
*/
int sock_register(const struct net_proto_family *ops)
{
int err;
if (ops->family >= NPROTO) {
printk(KERN_CRIT "protocol %d >= NPROTO(%d)\n", ops->family,
NPROTO);
return -ENOBUFS;
}
spin_lock(&net_family_lock);
if (rcu_dereference_protected(net_families[ops->family],
lockdep_is_held(&net_family_lock)))
err = -EEXIST;
else {
rcu_assign_pointer(net_families[ops->family], ops);
err = 0;
}
spin_unlock(&net_family_lock);
printk(KERN_INFO "NET: Registered protocol family %d\n", ops->family);
return err;
}
EXPORT_SYMBOL(sock_register);
/**
* sock_unregister - remove a protocol handler
* @family: protocol family to remove
*
* This function is called by a protocol handler that wants to
* remove its address family, and have it unlinked from the
* new socket creation.
*
* If protocol handler is a module, then it can use module reference
* counts to protect against new references. If protocol handler is not
* a module then it needs to provide its own protection in
* the ops->create routine.
*/
void sock_unregister(int family)
{
BUG_ON(family < 0 || family >= NPROTO);
spin_lock(&net_family_lock);
RCU_INIT_POINTER(net_families[family], NULL);
spin_unlock(&net_family_lock);
synchronize_rcu();
printk(KERN_INFO "NET: Unregistered protocol family %d\n", family);
}
EXPORT_SYMBOL(sock_unregister);
static int __init sock_init(void)
{
int err;
/*
* Initialize the network sysctl infrastructure.
*/
err = net_sysctl_init();
if (err)
goto out;
/*
* Initialize sock SLAB cache.
*/
sk_init();
/*
* Initialize skbuff SLAB cache
*/
skb_init();
/*
* Initialize the protocols module.
*/
init_inodecache();
err = register_filesystem(&sock_fs_type);
if (err)
goto out_fs;
sock_mnt = kern_mount(&sock_fs_type);
if (IS_ERR(sock_mnt)) {
err = PTR_ERR(sock_mnt);
goto out_mount;
}
/* The real protocol initialization is performed in later initcalls.
*/
#ifdef CONFIG_NETFILTER
netfilter_init();
#endif
#ifdef CONFIG_NETWORK_PHY_TIMESTAMPING
skb_timestamping_init();
#endif
out:
return err;
out_mount:
unregister_filesystem(&sock_fs_type);
out_fs:
goto out;
}
core_initcall(sock_init); /* early initcall */
#ifdef CONFIG_PROC_FS
void socket_seq_show(struct seq_file *seq)
{
int cpu;
int counter = 0;
for_each_possible_cpu(cpu)
counter += per_cpu(sockets_in_use, cpu);
/* It can be negative, by the way. 8) */
if (counter < 0)
counter = 0;
seq_printf(seq, "sockets: used %d\n", counter);
}
#endif /* CONFIG_PROC_FS */
#ifdef CONFIG_COMPAT
static int do_siocgstamp(struct net *net, struct socket *sock,
unsigned int cmd, void __user *up)
{
mm_segment_t old_fs = get_fs();
struct timeval ktv;
int err;
set_fs(KERNEL_DS);
err = sock_do_ioctl(net, sock, cmd, (unsigned long)&ktv);
set_fs(old_fs);
if (!err)
err = compat_put_timeval(&ktv, up);
return err;
}
static int do_siocgstampns(struct net *net, struct socket *sock,
unsigned int cmd, void __user *up)
{
mm_segment_t old_fs = get_fs();
struct timespec kts;
int err;
set_fs(KERNEL_DS);
err = sock_do_ioctl(net, sock, cmd, (unsigned long)&kts);
set_fs(old_fs);
if (!err)
err = compat_put_timespec(&kts, up);
return err;
}
static int dev_ifname32(struct net *net, struct compat_ifreq __user *uifr32)
{
struct ifreq __user *uifr;
int err;
uifr = compat_alloc_user_space(sizeof(struct ifreq));
if (copy_in_user(uifr, uifr32, sizeof(struct compat_ifreq)))
return -EFAULT;
err = dev_ioctl(net, SIOCGIFNAME, uifr);
if (err)
return err;
if (copy_in_user(uifr32, uifr, sizeof(struct compat_ifreq)))
return -EFAULT;
return 0;
}
static int dev_ifconf(struct net *net, struct compat_ifconf __user *uifc32)
{
struct compat_ifconf ifc32;
struct ifconf ifc;
struct ifconf __user *uifc;
struct compat_ifreq __user *ifr32;
struct ifreq __user *ifr;
unsigned int i, j;
int err;
if (copy_from_user(&ifc32, uifc32, sizeof(struct compat_ifconf)))
return -EFAULT;
memset(&ifc, 0, sizeof(ifc));
if (ifc32.ifcbuf == 0) {
ifc32.ifc_len = 0;
ifc.ifc_len = 0;
ifc.ifc_req = NULL;
uifc = compat_alloc_user_space(sizeof(struct ifconf));
} else {
size_t len = ((ifc32.ifc_len / sizeof(struct compat_ifreq)) + 1) *
sizeof(struct ifreq);
uifc = compat_alloc_user_space(sizeof(struct ifconf) + len);
ifc.ifc_len = len;
ifr = ifc.ifc_req = (void __user *)(uifc + 1);
ifr32 = compat_ptr(ifc32.ifcbuf);
for (i = 0; i < ifc32.ifc_len; i += sizeof(struct compat_ifreq)) {
if (copy_in_user(ifr, ifr32, sizeof(struct compat_ifreq)))
return -EFAULT;
ifr++;
ifr32++;
}
}
if (copy_to_user(uifc, &ifc, sizeof(struct ifconf)))
return -EFAULT;
err = dev_ioctl(net, SIOCGIFCONF, uifc);
if (err)
return err;
if (copy_from_user(&ifc, uifc, sizeof(struct ifconf)))
return -EFAULT;
ifr = ifc.ifc_req;
ifr32 = compat_ptr(ifc32.ifcbuf);
for (i = 0, j = 0;
i + sizeof(struct compat_ifreq) <= ifc32.ifc_len && j < ifc.ifc_len;
i += sizeof(struct compat_ifreq), j += sizeof(struct ifreq)) {
if (copy_in_user(ifr32, ifr, sizeof(struct compat_ifreq)))
return -EFAULT;
ifr32++;
ifr++;
}
if (ifc32.ifcbuf == 0) {
/* Translate from 64-bit structure multiple to
* a 32-bit one.
*/
i = ifc.ifc_len;
i = ((i / sizeof(struct ifreq)) * sizeof(struct compat_ifreq));
ifc32.ifc_len = i;
} else {
ifc32.ifc_len = i;
}
if (copy_to_user(uifc32, &ifc32, sizeof(struct compat_ifconf)))
return -EFAULT;
return 0;
}
static int ethtool_ioctl(struct net *net, struct compat_ifreq __user *ifr32)
{
struct compat_ethtool_rxnfc __user *compat_rxnfc;
bool convert_in = false, convert_out = false;
size_t buf_size = ALIGN(sizeof(struct ifreq), 8);
struct ethtool_rxnfc __user *rxnfc;
struct ifreq __user *ifr;
u32 rule_cnt = 0, actual_rule_cnt;
u32 ethcmd;
u32 data;
int ret;
if (get_user(data, &ifr32->ifr_ifru.ifru_data))
return -EFAULT;
compat_rxnfc = compat_ptr(data);
if (get_user(ethcmd, &compat_rxnfc->cmd))
return -EFAULT;
/* Most ethtool structures are defined without padding.
* Unfortunately struct ethtool_rxnfc is an exception.
*/
switch (ethcmd) {
default:
break;
case ETHTOOL_GRXCLSRLALL:
/* Buffer size is variable */
if (get_user(rule_cnt, &compat_rxnfc->rule_cnt))
return -EFAULT;
if (rule_cnt > KMALLOC_MAX_SIZE / sizeof(u32))
return -ENOMEM;
buf_size += rule_cnt * sizeof(u32);
/* fall through */
case ETHTOOL_GRXRINGS:
case ETHTOOL_GRXCLSRLCNT:
case ETHTOOL_GRXCLSRULE:
case ETHTOOL_SRXCLSRLINS:
convert_out = true;
/* fall through */
case ETHTOOL_SRXCLSRLDEL:
buf_size += sizeof(struct ethtool_rxnfc);
convert_in = true;
break;
}
ifr = compat_alloc_user_space(buf_size);
rxnfc = (void *)ifr + ALIGN(sizeof(struct ifreq), 8);
if (copy_in_user(&ifr->ifr_name, &ifr32->ifr_name, IFNAMSIZ))
return -EFAULT;
if (put_user(convert_in ? rxnfc : compat_ptr(data),
&ifr->ifr_ifru.ifru_data))
return -EFAULT;
if (convert_in) {
/* We expect there to be holes between fs.m_ext and
* fs.ring_cookie and at the end of fs, but nowhere else.
*/
BUILD_BUG_ON(offsetof(struct compat_ethtool_rxnfc, fs.m_ext) +
sizeof(compat_rxnfc->fs.m_ext) !=
offsetof(struct ethtool_rxnfc, fs.m_ext) +
sizeof(rxnfc->fs.m_ext));
BUILD_BUG_ON(
offsetof(struct compat_ethtool_rxnfc, fs.location) -
offsetof(struct compat_ethtool_rxnfc, fs.ring_cookie) !=
offsetof(struct ethtool_rxnfc, fs.location) -
offsetof(struct ethtool_rxnfc, fs.ring_cookie));
if (copy_in_user(rxnfc, compat_rxnfc,
(void *)(&rxnfc->fs.m_ext + 1) -
(void *)rxnfc) ||
copy_in_user(&rxnfc->fs.ring_cookie,
&compat_rxnfc->fs.ring_cookie,
(void *)(&rxnfc->fs.location + 1) -
(void *)&rxnfc->fs.ring_cookie) ||
copy_in_user(&rxnfc->rule_cnt, &compat_rxnfc->rule_cnt,
sizeof(rxnfc->rule_cnt)))
return -EFAULT;
}
ret = dev_ioctl(net, SIOCETHTOOL, ifr);
if (ret)
return ret;
if (convert_out) {
if (copy_in_user(compat_rxnfc, rxnfc,
(const void *)(&rxnfc->fs.m_ext + 1) -
(const void *)rxnfc) ||
copy_in_user(&compat_rxnfc->fs.ring_cookie,
&rxnfc->fs.ring_cookie,
(const void *)(&rxnfc->fs.location + 1) -
(const void *)&rxnfc->fs.ring_cookie) ||
copy_in_user(&compat_rxnfc->rule_cnt, &rxnfc->rule_cnt,
sizeof(rxnfc->rule_cnt)))
return -EFAULT;
if (ethcmd == ETHTOOL_GRXCLSRLALL) {
/* As an optimisation, we only copy the actual
* number of rules that the underlying
* function returned. Since Mallory might
* change the rule count in user memory, we
* check that it is less than the rule count
* originally given (as the user buffer size),
* which has been range-checked.
*/
if (get_user(actual_rule_cnt, &rxnfc->rule_cnt))
return -EFAULT;
if (actual_rule_cnt < rule_cnt)
rule_cnt = actual_rule_cnt;
if (copy_in_user(&compat_rxnfc->rule_locs[0],
&rxnfc->rule_locs[0],
rule_cnt * sizeof(u32)))
return -EFAULT;
}
}
return 0;
}
static int compat_siocwandev(struct net *net, struct compat_ifreq __user *uifr32)
{
void __user *uptr;
compat_uptr_t uptr32;
struct ifreq __user *uifr;
uifr = compat_alloc_user_space(sizeof(*uifr));
if (copy_in_user(uifr, uifr32, sizeof(struct compat_ifreq)))
return -EFAULT;
if (get_user(uptr32, &uifr32->ifr_settings.ifs_ifsu))
return -EFAULT;
uptr = compat_ptr(uptr32);
if (put_user(uptr, &uifr->ifr_settings.ifs_ifsu.raw_hdlc))
return -EFAULT;
return dev_ioctl(net, SIOCWANDEV, uifr);
}
static int bond_ioctl(struct net *net, unsigned int cmd,
struct compat_ifreq __user *ifr32)
{
struct ifreq kifr;
struct ifreq __user *uifr;
mm_segment_t old_fs;
int err;
u32 data;
void __user *datap;
switch (cmd) {
case SIOCBONDENSLAVE:
case SIOCBONDRELEASE:
case SIOCBONDSETHWADDR:
case SIOCBONDCHANGEACTIVE:
if (copy_from_user(&kifr, ifr32, sizeof(struct compat_ifreq)))
return -EFAULT;
old_fs = get_fs();
set_fs(KERNEL_DS);
err = dev_ioctl(net, cmd,
(struct ifreq __user __force *) &kifr);
set_fs(old_fs);
return err;
case SIOCBONDSLAVEINFOQUERY:
case SIOCBONDINFOQUERY:
uifr = compat_alloc_user_space(sizeof(*uifr));
if (copy_in_user(&uifr->ifr_name, &ifr32->ifr_name, IFNAMSIZ))
return -EFAULT;
if (get_user(data, &ifr32->ifr_ifru.ifru_data))
return -EFAULT;
datap = compat_ptr(data);
if (put_user(datap, &uifr->ifr_ifru.ifru_data))
return -EFAULT;
return dev_ioctl(net, cmd, uifr);
default:
return -ENOIOCTLCMD;
}
}
static int siocdevprivate_ioctl(struct net *net, unsigned int cmd,
struct compat_ifreq __user *u_ifreq32)
{
struct ifreq __user *u_ifreq64;
char tmp_buf[IFNAMSIZ];
void __user *data64;
u32 data32;
if (copy_from_user(&tmp_buf[0], &(u_ifreq32->ifr_ifrn.ifrn_name[0]),
IFNAMSIZ))
return -EFAULT;
if (__get_user(data32, &u_ifreq32->ifr_ifru.ifru_data))
return -EFAULT;
data64 = compat_ptr(data32);
u_ifreq64 = compat_alloc_user_space(sizeof(*u_ifreq64));
/* Don't check these user accesses, just let that get trapped
* in the ioctl handler instead.
*/
if (copy_to_user(&u_ifreq64->ifr_ifrn.ifrn_name[0], &tmp_buf[0],
IFNAMSIZ))
return -EFAULT;
if (__put_user(data64, &u_ifreq64->ifr_ifru.ifru_data))
return -EFAULT;
return dev_ioctl(net, cmd, u_ifreq64);
}
static int dev_ifsioc(struct net *net, struct socket *sock,
unsigned int cmd, struct compat_ifreq __user *uifr32)
{
struct ifreq __user *uifr;
int err;
uifr = compat_alloc_user_space(sizeof(*uifr));
if (copy_in_user(uifr, uifr32, sizeof(*uifr32)))
return -EFAULT;
err = sock_do_ioctl(net, sock, cmd, (unsigned long)uifr);
if (!err) {
switch (cmd) {
case SIOCGIFFLAGS:
case SIOCGIFMETRIC:
case SIOCGIFMTU:
case SIOCGIFMEM:
case SIOCGIFHWADDR:
case SIOCGIFINDEX:
case SIOCGIFADDR:
case SIOCGIFBRDADDR:
case SIOCGIFDSTADDR:
case SIOCGIFNETMASK:
case SIOCGIFPFLAGS:
case SIOCGIFTXQLEN:
case SIOCGMIIPHY:
case SIOCGMIIREG:
if (copy_in_user(uifr32, uifr, sizeof(*uifr32)))
err = -EFAULT;
break;
}
}
return err;
}
static int compat_sioc_ifmap(struct net *net, unsigned int cmd,
struct compat_ifreq __user *uifr32)
{
struct ifreq ifr;
struct compat_ifmap __user *uifmap32;
mm_segment_t old_fs;
int err;
uifmap32 = &uifr32->ifr_ifru.ifru_map;
err = copy_from_user(&ifr, uifr32, sizeof(ifr.ifr_name));
err |= __get_user(ifr.ifr_map.mem_start, &uifmap32->mem_start);
err |= __get_user(ifr.ifr_map.mem_end, &uifmap32->mem_end);
err |= __get_user(ifr.ifr_map.base_addr, &uifmap32->base_addr);
err |= __get_user(ifr.ifr_map.irq, &uifmap32->irq);
err |= __get_user(ifr.ifr_map.dma, &uifmap32->dma);
err |= __get_user(ifr.ifr_map.port, &uifmap32->port);
if (err)
return -EFAULT;
old_fs = get_fs();
set_fs(KERNEL_DS);
err = dev_ioctl(net, cmd, (void __user __force *)&ifr);
set_fs(old_fs);
if (cmd == SIOCGIFMAP && !err) {
err = copy_to_user(uifr32, &ifr, sizeof(ifr.ifr_name));
err |= __put_user(ifr.ifr_map.mem_start, &uifmap32->mem_start);
err |= __put_user(ifr.ifr_map.mem_end, &uifmap32->mem_end);
err |= __put_user(ifr.ifr_map.base_addr, &uifmap32->base_addr);
err |= __put_user(ifr.ifr_map.irq, &uifmap32->irq);
err |= __put_user(ifr.ifr_map.dma, &uifmap32->dma);
err |= __put_user(ifr.ifr_map.port, &uifmap32->port);
if (err)
err = -EFAULT;
}
return err;
}
static int compat_siocshwtstamp(struct net *net, struct compat_ifreq __user *uifr32)
{
void __user *uptr;
compat_uptr_t uptr32;
struct ifreq __user *uifr;
uifr = compat_alloc_user_space(sizeof(*uifr));
if (copy_in_user(uifr, uifr32, sizeof(struct compat_ifreq)))
return -EFAULT;
if (get_user(uptr32, &uifr32->ifr_data))
return -EFAULT;
uptr = compat_ptr(uptr32);
if (put_user(uptr, &uifr->ifr_data))
return -EFAULT;
return dev_ioctl(net, SIOCSHWTSTAMP, uifr);
}
struct rtentry32 {
u32 rt_pad1;
struct sockaddr rt_dst; /* target address */
struct sockaddr rt_gateway; /* gateway addr (RTF_GATEWAY) */
struct sockaddr rt_genmask; /* target network mask (IP) */
unsigned short rt_flags;
short rt_pad2;
u32 rt_pad3;
unsigned char rt_tos;
unsigned char rt_class;
short rt_pad4;
short rt_metric; /* +1 for binary compatibility! */
/* char * */ u32 rt_dev; /* forcing the device at add */
u32 rt_mtu; /* per route MTU/Window */
u32 rt_window; /* Window clamping */
unsigned short rt_irtt; /* Initial RTT */
};
struct in6_rtmsg32 {
struct in6_addr rtmsg_dst;
struct in6_addr rtmsg_src;
struct in6_addr rtmsg_gateway;
u32 rtmsg_type;
u16 rtmsg_dst_len;
u16 rtmsg_src_len;
u32 rtmsg_metric;
u32 rtmsg_info;
u32 rtmsg_flags;
s32 rtmsg_ifindex;
};
static int routing_ioctl(struct net *net, struct socket *sock,
unsigned int cmd, void __user *argp)
{
int ret;
void *r = NULL;
struct in6_rtmsg r6;
struct rtentry r4;
char devname[16];
u32 rtdev;
mm_segment_t old_fs = get_fs();
if (sock && sock->sk && sock->sk->sk_family == AF_INET6) { /* ipv6 */
struct in6_rtmsg32 __user *ur6 = argp;
ret = copy_from_user(&r6.rtmsg_dst, &(ur6->rtmsg_dst),
3 * sizeof(struct in6_addr));
ret |= __get_user(r6.rtmsg_type, &(ur6->rtmsg_type));
ret |= __get_user(r6.rtmsg_dst_len, &(ur6->rtmsg_dst_len));
ret |= __get_user(r6.rtmsg_src_len, &(ur6->rtmsg_src_len));
ret |= __get_user(r6.rtmsg_metric, &(ur6->rtmsg_metric));
ret |= __get_user(r6.rtmsg_info, &(ur6->rtmsg_info));
ret |= __get_user(r6.rtmsg_flags, &(ur6->rtmsg_flags));
ret |= __get_user(r6.rtmsg_ifindex, &(ur6->rtmsg_ifindex));
r = (void *) &r6;
} else { /* ipv4 */
struct rtentry32 __user *ur4 = argp;
ret = copy_from_user(&r4.rt_dst, &(ur4->rt_dst),
3 * sizeof(struct sockaddr));
ret |= __get_user(r4.rt_flags, &(ur4->rt_flags));
ret |= __get_user(r4.rt_metric, &(ur4->rt_metric));
ret |= __get_user(r4.rt_mtu, &(ur4->rt_mtu));
ret |= __get_user(r4.rt_window, &(ur4->rt_window));
ret |= __get_user(r4.rt_irtt, &(ur4->rt_irtt));
ret |= __get_user(rtdev, &(ur4->rt_dev));
if (rtdev) {
ret |= copy_from_user(devname, compat_ptr(rtdev), 15);
r4.rt_dev = (char __user __force *)devname;
devname[15] = 0;
} else
r4.rt_dev = NULL;
r = (void *) &r4;
}
if (ret) {
ret = -EFAULT;
goto out;
}
set_fs(KERNEL_DS);
ret = sock_do_ioctl(net, sock, cmd, (unsigned long) r);
set_fs(old_fs);
out:
return ret;
}
/* Since old style bridge ioctl's endup using SIOCDEVPRIVATE
* for some operations; this forces use of the newer bridge-utils that
* use compatible ioctls
*/
static int old_bridge_ioctl(compat_ulong_t __user *argp)
{
compat_ulong_t tmp;
if (get_user(tmp, argp))
return -EFAULT;
if (tmp == BRCTL_GET_VERSION)
return BRCTL_VERSION + 1;
return -EINVAL;
}
static int compat_sock_ioctl_trans(struct file *file, struct socket *sock,
unsigned int cmd, unsigned long arg)
{
void __user *argp = compat_ptr(arg);
struct sock *sk = sock->sk;
struct net *net = sock_net(sk);
if (cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15))
return siocdevprivate_ioctl(net, cmd, argp);
switch (cmd) {
case SIOCSIFBR:
case SIOCGIFBR:
return old_bridge_ioctl(argp);
case SIOCGIFNAME:
return dev_ifname32(net, argp);
case SIOCGIFCONF:
return dev_ifconf(net, argp);
case SIOCETHTOOL:
return ethtool_ioctl(net, argp);
case SIOCWANDEV:
return compat_siocwandev(net, argp);
case SIOCGIFMAP:
case SIOCSIFMAP:
return compat_sioc_ifmap(net, cmd, argp);
case SIOCBONDENSLAVE:
case SIOCBONDRELEASE:
case SIOCBONDSETHWADDR:
case SIOCBONDSLAVEINFOQUERY:
case SIOCBONDINFOQUERY:
case SIOCBONDCHANGEACTIVE:
return bond_ioctl(net, cmd, argp);
case SIOCADDRT:
case SIOCDELRT:
return routing_ioctl(net, sock, cmd, argp);
case SIOCGSTAMP:
return do_siocgstamp(net, sock, cmd, argp);
case SIOCGSTAMPNS:
return do_siocgstampns(net, sock, cmd, argp);
case SIOCSHWTSTAMP:
return compat_siocshwtstamp(net, argp);
case FIOSETOWN:
case SIOCSPGRP:
case FIOGETOWN:
case SIOCGPGRP:
case SIOCBRADDBR:
case SIOCBRDELBR:
case SIOCGIFVLAN:
case SIOCSIFVLAN:
case SIOCADDDLCI:
case SIOCDELDLCI:
return sock_ioctl(file, cmd, arg);
case SIOCGIFFLAGS:
case SIOCSIFFLAGS:
case SIOCGIFMETRIC:
case SIOCSIFMETRIC:
case SIOCGIFMTU:
case SIOCSIFMTU:
case SIOCGIFMEM:
case SIOCSIFMEM:
case SIOCGIFHWADDR:
case SIOCSIFHWADDR:
case SIOCADDMULTI:
case SIOCDELMULTI:
case SIOCGIFINDEX:
case SIOCGIFADDR:
case SIOCSIFADDR:
case SIOCSIFHWBROADCAST:
case SIOCDIFADDR:
case SIOCGIFBRDADDR:
case SIOCSIFBRDADDR:
case SIOCGIFDSTADDR:
case SIOCSIFDSTADDR:
case SIOCGIFNETMASK:
case SIOCSIFNETMASK:
case SIOCSIFPFLAGS:
case SIOCGIFPFLAGS:
case SIOCGIFTXQLEN:
case SIOCSIFTXQLEN:
case SIOCBRADDIF:
case SIOCBRDELIF:
case SIOCSIFNAME:
case SIOCGMIIPHY:
case SIOCGMIIREG:
case SIOCSMIIREG:
return dev_ifsioc(net, sock, cmd, argp);
case SIOCSARP:
case SIOCGARP:
case SIOCDARP:
case SIOCATMARK:
return sock_do_ioctl(net, sock, cmd, arg);
}
return -ENOIOCTLCMD;
}
static long compat_sock_ioctl(struct file *file, unsigned int cmd,
unsigned long arg)
{
struct socket *sock = file->private_data;
int ret = -ENOIOCTLCMD;
struct sock *sk;
struct net *net;
sk = sock->sk;
net = sock_net(sk);
if (sock->ops->compat_ioctl)
ret = sock->ops->compat_ioctl(sock, cmd, arg);
if (ret == -ENOIOCTLCMD &&
(cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST))
ret = compat_wext_handle_ioctl(net, cmd, arg);
if (ret == -ENOIOCTLCMD)
ret = compat_sock_ioctl_trans(file, sock, cmd, arg);
return ret;
}
#endif
int kernel_bind(struct socket *sock, struct sockaddr *addr, int addrlen)
{
return sock->ops->bind(sock, addr, addrlen);
}
EXPORT_SYMBOL(kernel_bind);
int kernel_listen(struct socket *sock, int backlog)
{
return sock->ops->listen(sock, backlog);
}
EXPORT_SYMBOL(kernel_listen);
int kernel_accept(struct socket *sock, struct socket **newsock, int flags)
{
struct sock *sk = sock->sk;
int err;
err = sock_create_lite(sk->sk_family, sk->sk_type, sk->sk_protocol,
newsock);
if (err < 0)
goto done;
err = sock->ops->accept(sock, *newsock, flags);
if (err < 0) {
sock_release(*newsock);
*newsock = NULL;
goto done;
}
(*newsock)->ops = sock->ops;
__module_get((*newsock)->ops->owner);
done:
return err;
}
EXPORT_SYMBOL(kernel_accept);
int kernel_connect(struct socket *sock, struct sockaddr *addr, int addrlen,
int flags)
{
return sock->ops->connect(sock, addr, addrlen, flags);
}
EXPORT_SYMBOL(kernel_connect);
int kernel_getsockname(struct socket *sock, struct sockaddr *addr,
int *addrlen)
{
return sock->ops->getname(sock, addr, addrlen, 0);
}
EXPORT_SYMBOL(kernel_getsockname);
int kernel_getpeername(struct socket *sock, struct sockaddr *addr,
int *addrlen)
{
return sock->ops->getname(sock, addr, addrlen, 1);
}
EXPORT_SYMBOL(kernel_getpeername);
int kernel_getsockopt(struct socket *sock, int level, int optname,
char *optval, int *optlen)
{
mm_segment_t oldfs = get_fs();
char __user *uoptval;
int __user *uoptlen;
int err;
uoptval = (char __user __force *) optval;
uoptlen = (int __user __force *) optlen;
set_fs(KERNEL_DS);
if (level == SOL_SOCKET)
err = sock_getsockopt(sock, level, optname, uoptval, uoptlen);
else
err = sock->ops->getsockopt(sock, level, optname, uoptval,
uoptlen);
set_fs(oldfs);
return err;
}
EXPORT_SYMBOL(kernel_getsockopt);
int kernel_setsockopt(struct socket *sock, int level, int optname,
char *optval, unsigned int optlen)
{
mm_segment_t oldfs = get_fs();
char __user *uoptval;
int err;
uoptval = (char __user __force *) optval;
set_fs(KERNEL_DS);
if (level == SOL_SOCKET)
err = sock_setsockopt(sock, level, optname, uoptval, optlen);
else
err = sock->ops->setsockopt(sock, level, optname, uoptval,
optlen);
set_fs(oldfs);
return err;
}
EXPORT_SYMBOL(kernel_setsockopt);
int kernel_sendpage(struct socket *sock, struct page *page, int offset,
size_t size, int flags)
{
sock_update_classid(sock->sk);
if (sock->ops->sendpage)
return sock->ops->sendpage(sock, page, offset, size, flags);
return sock_no_sendpage(sock, page, offset, size, flags);
}
EXPORT_SYMBOL(kernel_sendpage);
int kernel_sock_ioctl(struct socket *sock, int cmd, unsigned long arg)
{
mm_segment_t oldfs = get_fs();
int err;
set_fs(KERNEL_DS);
err = sock->ops->ioctl(sock, cmd, arg);
set_fs(oldfs);
return err;
}
EXPORT_SYMBOL(kernel_sock_ioctl);
int kernel_sock_shutdown(struct socket *sock, enum sock_shutdown_cmd how)
{
return sock->ops->shutdown(sock, how);
}
EXPORT_SYMBOL(kernel_sock_shutdown);
Reference in New Issue View Git Blame Copy Permalink