diff options
Diffstat (limited to 'kernel/net/socket.c')
| -rw-r--r-- | kernel/net/socket.c | 3304 |
1 files changed, 3304 insertions, 0 deletions
diff --git a/kernel/net/socket.c b/kernel/net/socket.c new file mode 100644 index 000000000..884e32997 --- /dev/null +++ b/kernel/net/socket.c @@ -0,0 +1,3304 @@ +/* + * 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/if_bridge.h> +#include <linux/if_frad.h> +#include <linux/if_vlan.h> +#include <linux/ptp_classify.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 <linux/xattr.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> +#include <net/busy_poll.h> +#include <linux/errqueue.h> + +#ifdef CONFIG_NET_RX_BUSY_POLL +unsigned int sysctl_net_busy_read __read_mostly; +unsigned int sysctl_net_busy_poll __read_mostly; +#endif + +static ssize_t sock_read_iter(struct kiocb *iocb, struct iov_iter *to); +static ssize_t sock_write_iter(struct kiocb *iocb, struct iov_iter *from); +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, + .read_iter = sock_read_iter, + .write_iter = sock_write_iter, + .poll = sock_poll, + .unlocked_ioctl = sock_ioctl, +#ifdef CONFIG_COMPAT + .compat_ioctl = compat_sock_ioctl, +#endif + .mmap = sock_mmap, + .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; + + BUG_ON(klen > sizeof(struct sockaddr_storage)); + err = get_user(len, ulen); + if (err) + return err; + if (len > klen) + len = klen; + if (len < 0) + 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]", + d_inode(dentry)->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. + */ + +struct file *sock_alloc_file(struct socket *sock, int flags, const char *dname) +{ + struct qstr name = { .name = "" }; + struct path path; + struct file *file; + + if (dname) { + name.name = dname; + name.len = strlen(name.name); + } else if (sock->sk) { + name.name = sock->sk->sk_prot_creator->name; + name.len = strlen(name.name); + } + path.dentry = d_alloc_pseudo(sock_mnt->mnt_sb, &name); + if (unlikely(!path.dentry)) + return ERR_PTR(-ENOMEM); + path.mnt = mntget(sock_mnt); + + d_instantiate(path.dentry, SOCK_INODE(sock)); + + file = alloc_file(&path, FMODE_READ | FMODE_WRITE, + &socket_file_ops); + if (unlikely(IS_ERR(file))) { + /* drop dentry, keep inode */ + ihold(d_inode(path.dentry)); + path_put(&path); + return file; + } + + sock->file = file; + file->f_flags = O_RDWR | (flags & O_NONBLOCK); + file->private_data = sock; + return file; +} +EXPORT_SYMBOL(sock_alloc_file); + +static int sock_map_fd(struct socket *sock, int flags) +{ + struct file *newfile; + int fd = get_unused_fd_flags(flags); + if (unlikely(fd < 0)) + return fd; + + newfile = sock_alloc_file(sock, flags, NULL); + if (likely(!IS_ERR(newfile))) { + fd_install(fd, newfile); + return fd; + } + + put_unused_fd(fd); + return PTR_ERR(newfile); +} + +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 fd f = fdget(fd); + struct socket *sock; + + *err = -EBADF; + if (f.file) { + sock = sock_from_file(f.file, err); + if (likely(sock)) { + *fput_needed = f.flags; + return sock; + } + fdput(f); + } + return NULL; +} + +#define XATTR_SOCKPROTONAME_SUFFIX "sockprotoname" +#define XATTR_NAME_SOCKPROTONAME (XATTR_SYSTEM_PREFIX XATTR_SOCKPROTONAME_SUFFIX) +#define XATTR_NAME_SOCKPROTONAME_LEN (sizeof(XATTR_NAME_SOCKPROTONAME)-1) +static ssize_t sockfs_getxattr(struct dentry *dentry, + const char *name, void *value, size_t size) +{ + const char *proto_name; + size_t proto_size; + int error; + + error = -ENODATA; + if (!strncmp(name, XATTR_NAME_SOCKPROTONAME, XATTR_NAME_SOCKPROTONAME_LEN)) { + proto_name = dentry->d_name.name; + proto_size = strlen(proto_name); + + if (value) { + error = -ERANGE; + if (proto_size + 1 > size) + goto out; + + strncpy(value, proto_name, proto_size + 1); + } + error = proto_size + 1; + } + +out: + return error; +} + +static ssize_t sockfs_listxattr(struct dentry *dentry, char *buffer, + size_t size) +{ + ssize_t len; + ssize_t used = 0; + + len = security_inode_listsecurity(d_inode(dentry), buffer, size); + if (len < 0) + return len; + used += len; + if (buffer) { + if (size < used) + return -ERANGE; + buffer += len; + } + + len = (XATTR_NAME_SOCKPROTONAME_LEN + 1); + used += len; + if (buffer) { + if (size < used) + return -ERANGE; + memcpy(buffer, XATTR_NAME_SOCKPROTONAME, len); + buffer += len; + } + + return used; +} + +static const struct inode_operations sockfs_inode_ops = { + .getxattr = sockfs_getxattr, + .listxattr = sockfs_listxattr, +}; + +/** + * 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(); + inode->i_op = &sockfs_inode_ops; + + this_cpu_add(sockets_in_use, 1); + return sock; +} + +/** + * 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) + pr_err("%s: fasync list not empty!\n", __func__); + + 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); + +void __sock_tx_timestamp(const struct sock *sk, __u8 *tx_flags) +{ + u8 flags = *tx_flags; + + if (sk->sk_tsflags & SOF_TIMESTAMPING_TX_HARDWARE) + flags |= SKBTX_HW_TSTAMP; + + if (sk->sk_tsflags & SOF_TIMESTAMPING_TX_SOFTWARE) + flags |= SKBTX_SW_TSTAMP; + + if (sk->sk_tsflags & SOF_TIMESTAMPING_TX_SCHED) + flags |= SKBTX_SCHED_TSTAMP; + + if (sk->sk_tsflags & SOF_TIMESTAMPING_TX_ACK) + flags |= SKBTX_ACK_TSTAMP; + + *tx_flags = flags; +} +EXPORT_SYMBOL(__sock_tx_timestamp); + +static inline int sock_sendmsg_nosec(struct socket *sock, struct msghdr *msg) +{ + int ret = sock->ops->sendmsg(sock, msg, msg_data_left(msg)); + BUG_ON(ret == -EIOCBQUEUED); + return ret; +} + +int sock_sendmsg(struct socket *sock, struct msghdr *msg) +{ + int err = security_socket_sendmsg(sock, msg, + msg_data_left(msg)); + + return err ?: sock_sendmsg_nosec(sock, msg); +} +EXPORT_SYMBOL(sock_sendmsg); + +int kernel_sendmsg(struct socket *sock, struct msghdr *msg, + struct kvec *vec, size_t num, size_t size) +{ + iov_iter_kvec(&msg->msg_iter, WRITE | ITER_KVEC, vec, num, size); + return sock_sendmsg(sock, msg); +} +EXPORT_SYMBOL(kernel_sendmsg); + +/* + * 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 scm_timestamping tss; + 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 { + struct timespec ts; + skb_get_timestampns(skb, &ts); + put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMPNS, + sizeof(ts), &ts); + } + } + + memset(&tss, 0, sizeof(tss)); + if ((sk->sk_tsflags & SOF_TIMESTAMPING_SOFTWARE) && + ktime_to_timespec_cond(skb->tstamp, tss.ts + 0)) + empty = 0; + if (shhwtstamps && + (sk->sk_tsflags & SOF_TIMESTAMPING_RAW_HARDWARE) && + ktime_to_timespec_cond(shhwtstamps->hwtstamp, tss.ts + 2)) + empty = 0; + if (!empty) + put_cmsg(msg, SOL_SOCKET, + SCM_TIMESTAMPING, sizeof(tss), &tss); +} +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 && SOCK_SKB_CB(skb)->dropcount) + put_cmsg(msg, SOL_SOCKET, SO_RXQ_OVFL, + sizeof(__u32), &SOCK_SKB_CB(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 socket *sock, struct msghdr *msg, + size_t size, int flags) +{ + return sock->ops->recvmsg(sock, msg, size, flags); +} + +int sock_recvmsg(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(sock, msg, size, flags); +} +EXPORT_SYMBOL(sock_recvmsg); + +/** + * 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; + + iov_iter_kvec(&msg->msg_iter, READ | ITER_KVEC, vec, num, size); + set_fs(KERNEL_DS); + result = sock_recvmsg(sock, msg, size, flags); + set_fs(oldfs); + return result; +} +EXPORT_SYMBOL(kernel_recvmsg); + +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; + + return sock->ops->splice_read(sock, ppos, pipe, len, flags); +} + +static ssize_t sock_read_iter(struct kiocb *iocb, struct iov_iter *to) +{ + struct file *file = iocb->ki_filp; + struct socket *sock = file->private_data; + struct msghdr msg = {.msg_iter = *to, + .msg_iocb = iocb}; + ssize_t res; + + if (file->f_flags & O_NONBLOCK) + msg.msg_flags = MSG_DONTWAIT; + + if (iocb->ki_pos != 0) + return -ESPIPE; + + if (!iov_iter_count(to)) /* Match SYS5 behaviour */ + return 0; + + res = sock_recvmsg(sock, &msg, iov_iter_count(to), msg.msg_flags); + *to = msg.msg_iter; + return res; +} + +static ssize_t sock_write_iter(struct kiocb *iocb, struct iov_iter *from) +{ + struct file *file = iocb->ki_filp; + struct socket *sock = file->private_data; + struct msghdr msg = {.msg_iter = *from, + .msg_iocb = iocb}; + ssize_t res; + + if (iocb->ki_pos != 0) + return -ESPIPE; + + if (file->f_flags & O_NONBLOCK) + msg.msg_flags = MSG_DONTWAIT; + + if (sock->type == SOCK_SEQPACKET) + msg.msg_flags |= MSG_EOR; + + res = sock_sendmsg(sock, &msg); + *from = msg.msg_iter; + return res; +} + +/* + * 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; + f_setown(sock->file, pid, 1); + err = 0; + 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) +{ + unsigned int busy_flag = 0; + struct socket *sock; + + /* + * We can't return errors to poll, so it's either yes or no. + */ + sock = file->private_data; + + if (sk_can_busy_loop(sock->sk)) { + /* this socket can poll_ll so tell the system call */ + busy_flag = POLL_BUSY_LOOP; + + /* once, only if requested by syscall */ + if (wait && (wait->_key & POLL_BUSY_LOOP)) + sk_busy_loop(sock->sk, 1); + } + + return busy_flag | 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) +{ + 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; + pr_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 = get_unused_fd_flags(flags); + if (unlikely(fd1 < 0)) { + err = fd1; + goto out_release_both; + } + + fd2 = get_unused_fd_flags(flags); + if (unlikely(fd2 < 0)) { + err = fd2; + goto out_put_unused_1; + } + + newfile1 = sock_alloc_file(sock1, flags, NULL); + if (unlikely(IS_ERR(newfile1))) { + err = PTR_ERR(newfile1); + goto out_put_unused_both; + } + + newfile2 = sock_alloc_file(sock2, flags, NULL); + if (IS_ERR(newfile2)) { + err = PTR_ERR(newfile2); + goto out_fput_1; + } + + err = put_user(fd1, &usockvec[0]); + if (err) + goto out_fput_both; + + err = put_user(fd2, &usockvec[1]); + if (err) + goto out_fput_both; + + audit_fd_pair(fd1, fd2); + + fd_install(fd1, newfile1); + fd_install(fd2, newfile2); + /* fd1 and fd2 may be already another descriptors. + * Not kernel problem. + */ + + return 0; + +out_fput_both: + fput(newfile2); + fput(newfile1); + put_unused_fd(fd2); + put_unused_fd(fd1); + goto out; + +out_fput_1: + fput(newfile1); + put_unused_fd(fd2); + put_unused_fd(fd1); + sock_release(sock2); + goto out; + +out_put_unused_both: + put_unused_fd(fd2); +out_put_unused_1: + put_unused_fd(fd1); +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 = get_unused_fd_flags(flags); + if (unlikely(newfd < 0)) { + err = newfd; + sock_release(newsock); + goto out_put; + } + newfile = sock_alloc_file(newsock, flags, sock->sk->sk_prot_creator->name); + if (unlikely(IS_ERR(newfile))) { + err = PTR_ERR(newfile); + put_unused_fd(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; + + err = import_single_range(WRITE, buff, len, &iov, &msg.msg_iter); + if (unlikely(err)) + return err; + sock = sockfd_lookup_light(fd, &err, &fput_needed); + if (!sock) + goto out; + + msg.msg_name = NULL; + 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); + +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; + + err = import_single_range(READ, ubuf, size, &iov, &msg.msg_iter); + if (unlikely(err)) + return err; + sock = sockfd_lookup_light(fd, &err, &fput_needed); + if (!sock) + goto out; + + msg.msg_control = NULL; + msg.msg_controllen = 0; + /* Save some cycles and don't copy the address if not needed */ + msg.msg_name = addr ? (struct sockaddr *)&address : NULL; + /* We assume all kernel code knows the size of sockaddr_storage */ + msg.msg_namelen = 0; + if (sock->file->f_flags & O_NONBLOCK) + flags |= MSG_DONTWAIT; + err = sock_recvmsg(sock, &msg, iov_iter_count(&msg.msg_iter), 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. + */ + +SYSCALL_DEFINE4(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 copy_msghdr_from_user(struct msghdr *kmsg, + struct user_msghdr __user *umsg, + struct sockaddr __user **save_addr, + struct iovec **iov) +{ + struct sockaddr __user *uaddr; + struct iovec __user *uiov; + size_t nr_segs; + ssize_t err; + + if (!access_ok(VERIFY_READ, umsg, sizeof(*umsg)) || + __get_user(uaddr, &umsg->msg_name) || + __get_user(kmsg->msg_namelen, &umsg->msg_namelen) || + __get_user(uiov, &umsg->msg_iov) || + __get_user(nr_segs, &umsg->msg_iovlen) || + __get_user(kmsg->msg_control, &umsg->msg_control) || + __get_user(kmsg->msg_controllen, &umsg->msg_controllen) || + __get_user(kmsg->msg_flags, &umsg->msg_flags)) + return -EFAULT; + + if (!uaddr) + kmsg->msg_namelen = 0; + + if (kmsg->msg_namelen < 0) + return -EINVAL; + + if (kmsg->msg_namelen > sizeof(struct sockaddr_storage)) + kmsg->msg_namelen = sizeof(struct sockaddr_storage); + + if (save_addr) + *save_addr = uaddr; + + if (uaddr && kmsg->msg_namelen) { + if (!save_addr) { + err = move_addr_to_kernel(uaddr, kmsg->msg_namelen, + kmsg->msg_name); + if (err < 0) + return err; + } + } else { + kmsg->msg_name = NULL; + kmsg->msg_namelen = 0; + } + + if (nr_segs > UIO_MAXIOV) + return -EMSGSIZE; + + kmsg->msg_iocb = NULL; + + return import_iovec(save_addr ? READ : WRITE, uiov, nr_segs, + UIO_FASTIOV, iov, &kmsg->msg_iter); +} + +static int ___sys_sendmsg(struct socket *sock, struct user_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 ctl_len; + ssize_t err; + + msg_sys->msg_name = &address; + + if (MSG_CMSG_COMPAT & flags) + err = get_compat_msghdr(msg_sys, msg_compat, NULL, &iov); + else + err = copy_msghdr_from_user(msg_sys, msg, NULL, &iov); + if (err < 0) + return 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); + goto out_freectl; + } + err = sock_sendmsg(sock, msg_sys); + /* + * 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: + kfree(iov); + return err; +} + +/* + * BSD sendmsg interface + */ + +long __sys_sendmsg(int fd, struct user_msghdr __user *msg, unsigned flags) +{ + int fput_needed, err; + struct msghdr msg_sys; + struct socket *sock; + + 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; +} + +SYSCALL_DEFINE3(sendmsg, int, fd, struct user_msghdr __user *, msg, unsigned int, flags) +{ + if (flags & MSG_CMSG_COMPAT) + return -EINVAL; + return __sys_sendmsg(fd, msg, flags); +} + +/* + * 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 user_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 user_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) +{ + if (flags & MSG_CMSG_COMPAT) + return -EINVAL; + return __sys_sendmmsg(fd, mmsg, vlen, flags); +} + +static int ___sys_recvmsg(struct socket *sock, struct user_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 total_len, len; + ssize_t err; + + /* kernel mode address */ + struct sockaddr_storage addr; + + /* user mode address pointers */ + struct sockaddr __user *uaddr; + int __user *uaddr_len = COMPAT_NAMELEN(msg); + + msg_sys->msg_name = &addr; + + if (MSG_CMSG_COMPAT & flags) + err = get_compat_msghdr(msg_sys, msg_compat, &uaddr, &iov); + else + err = copy_msghdr_from_user(msg_sys, msg, &uaddr, &iov); + if (err < 0) + return err; + total_len = iov_iter_count(&msg_sys->msg_iter); + + cmsg_ptr = (unsigned long)msg_sys->msg_control; + msg_sys->msg_flags = flags & (MSG_CMSG_CLOEXEC|MSG_CMSG_COMPAT); + + /* We assume all kernel code knows the size of sockaddr_storage */ + msg_sys->msg_namelen = 0; + + 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: + kfree(iov); + return err; +} + +/* + * BSD recvmsg interface + */ + +long __sys_recvmsg(int fd, struct user_msghdr __user *msg, unsigned flags) +{ + int fput_needed, err; + struct msghdr msg_sys; + struct socket *sock; + + 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; +} + +SYSCALL_DEFINE3(recvmsg, int, fd, struct user_msghdr __user *, msg, + unsigned int, flags) +{ + if (flags & MSG_CMSG_COMPAT) + return -EINVAL; + return __sys_recvmsg(fd, msg, flags); +} + +/* + * 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 user_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 user_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 (flags & MSG_CMSG_COMPAT) + return -EINVAL; + + 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[AUDITSC_ARGS]; + 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; + + err = audit_socketcall(nargs[call] / sizeof(unsigned long), a); + if (err) + return err; + + 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 user_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 user_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 corresponds to the + * socket system call protocol family. + */ +int sock_register(const struct net_proto_family *ops) +{ + int err; + + if (ops->family >= NPROTO) { + pr_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); + + pr_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(); + + pr_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 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 + err = netfilter_init(); + if (err) + goto out; +#endif + + ptp_classifier_init(); + +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 __user *)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 __user *)(&rxnfc->fs.m_ext + 1) - + (void __user *)rxnfc) || + copy_in_user(&rxnfc->fs.ring_cookie, + &compat_rxnfc->fs.ring_cookie, + (void __user *)(&rxnfc->fs.location + 1) - + (void __user *)&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 __user *)(&rxnfc->fs.m_ext + 1) - + (const void __user *)rxnfc) || + copy_in_user(&compat_rxnfc->fs.ring_cookie, + &rxnfc->fs.ring_cookie, + (const void __user *)(&rxnfc->fs.location + 1) - + (const void __user *)&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; + mm_segment_t old_fs; + int err; + + 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; + default: + return -ENOIOCTLCMD; + } +} + +/* Handle ioctls that use ifreq::ifr_data and just need struct ifreq converted */ +static int compat_ifr_data_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)); + + 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; +} + +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 compat_ifr_data_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 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 SIOCBONDSLAVEINFOQUERY: + case SIOCBONDINFOQUERY: + case SIOCSHWTSTAMP: + case SIOCGHWTSTAMP: + return compat_ifr_data_ioctl(net, cmd, 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) +{ + 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); |