/net/socket.c
C | 3399 lines | 2433 code | 498 blank | 468 comment | 387 complexity | 62a2219eb264eab54f3c5e9bc10f5fbc MD5 | raw file
Possible License(s): GPL-2.0, LGPL-2.0, AGPL-1.0
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- /*
- * 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);
- #ifdef CONFIG_HTC_NETWORK_MODIFY
- if (IS_ERR(file) || (!file))
- printk(KERN_ERR "[NET] file is NULL in %s!\n", __func__);
- #endif
- 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);
- static 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;
- }
- /**
- * 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();
- percpu_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.
- */
- int add_or_remove_port(struct sock *sk, int add_or_remove); /* SSD_RIL: Garbage_Filter_TCP */
- void sock_release(struct socket *sock)
- {
- /* ++SSD_RIL: Garbage_Filter_TCP */
- if (sock->sk != NULL)
- add_or_remove_port(sock->sk, 0);
- /* --SSD_RIL: Garbage_Filter_TCP */
- 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;
- percpu_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);
- sock_update_netprioidx(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) {
- if (net_ratelimit())
- printk(KERN_WARNING "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)backlog > somaxconn)
- backlog = somaxconn;
- err = security_socket_listen(sock, backlog);
- if (!err)
- err = sock->ops->listen(sock, backlog);
- fput_light(sock->file, fput_needed);
- /* ++SSD_RIL: Garbage_Filter_TCP */
- if (sock->sk != NULL)
- add_or_remove_port(sock->sk, 1);
- /* --SSD_RIL: Garbage_Filter_TCP */
- }
- 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, 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, 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, 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 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 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, iov_size, 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;
- /* do not move before msg_sys is valid */
- err = -EMSGSIZE;
- if (msg_sys->msg_iovlen > UIO_MAXIOV)
- goto out;
- /* Check whether to allocate the iovec area */
- err = -ENOMEM;
- iov_size = msg_sys->msg_iovlen * sizeof(struct iovec);
- if (msg_sys->msg_iovlen > UIO_FASTIOV) {
- iov = sock_kmalloc(sock->sk, iov_size, 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…
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