diff options
Diffstat (limited to 'net/socket.c')
| -rw-r--r-- | net/socket.c | 2088 |
1 files changed, 2088 insertions, 0 deletions
diff --git a/net/socket.c b/net/socket.c new file mode 100644 index 00000000000..2cd44990d8d --- /dev/null +++ b/net/socket.c @@ -0,0 +1,2088 @@ +/* + * 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, <bir7@leland.Stanford.Edu> + * 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/config.h> +#include <linux/mm.h> +#include <linux/smp_lock.h> +#include <linux/socket.h> +#include <linux/file.h> +#include <linux/net.h> +#include <linux/interrupt.h> +#include <linux/netdevice.h> +#include <linux/proc_fs.h> +#include <linux/seq_file.h> +#include <linux/wanrouter.h> +#include <linux/if_bridge.h> +#include <linux/init.h> +#include <linux/poll.h> +#include <linux/cache.h> +#include <linux/module.h> +#include <linux/highmem.h> +#include <linux/divert.h> +#include <linux/mount.h> +#include <linux/security.h> +#include <linux/syscalls.h> +#include <linux/compat.h> +#include <linux/kmod.h> + +#ifdef CONFIG_NET_RADIO +#include <linux/wireless.h> /* Note : will define WIRELESS_EXT */ +#endif /* CONFIG_NET_RADIO */ + +#include <asm/uaccess.h> +#include <asm/unistd.h> + +#include <net/compat.h> + +#include <net/sock.h> +#include <linux/netfilter.h> + +static int sock_no_open(struct inode *irrelevant, struct file *dontcare); +static ssize_t sock_aio_read(struct kiocb *iocb, char __user *buf, + size_t size, loff_t pos); +static ssize_t sock_aio_write(struct kiocb *iocb, const char __user *buf, + size_t size, 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); +static int sock_fasync(int fd, struct file *filp, int on); +static ssize_t sock_readv(struct file *file, const struct iovec *vector, + unsigned long count, loff_t *ppos); +static ssize_t sock_writev(struct file *file, const struct iovec *vector, + unsigned long count, loff_t *ppos); +static ssize_t sock_sendpage(struct file *file, struct page *page, + int offset, size_t size, loff_t *ppos, int more); + + +/* + * 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 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, + .mmap = sock_mmap, + .open = sock_no_open, /* special open code to disallow open via /proc */ + .release = sock_close, + .fasync = sock_fasync, + .readv = sock_readv, + .writev = sock_writev, + .sendpage = sock_sendpage +}; + +/* + * The protocol list. Each protocol is registered in here. + */ + +static struct net_proto_family *net_families[NPROTO]; + +#if defined(CONFIG_SMP) || defined(CONFIG_PREEMPT) +static atomic_t net_family_lockct = ATOMIC_INIT(0); +static DEFINE_SPINLOCK(net_family_lock); + +/* The strategy is: modifications net_family vector are short, do not + sleep and veeery rare, but read access should be free of any exclusive + locks. + */ + +static void net_family_write_lock(void) +{ + spin_lock(&net_family_lock); + while (atomic_read(&net_family_lockct) != 0) { + spin_unlock(&net_family_lock); + + yield(); + + spin_lock(&net_family_lock); + } +} + +static __inline__ void net_family_write_unlock(void) +{ + spin_unlock(&net_family_lock); +} + +static __inline__ void net_family_read_lock(void) +{ + atomic_inc(&net_family_lockct); + spin_unlock_wait(&net_family_lock); +} + +static __inline__ void net_family_read_unlock(void) +{ + atomic_dec(&net_family_lockct); +} + +#else +#define net_family_write_lock() do { } while(0) +#define net_family_write_unlock() do { } while(0) +#define net_family_read_lock() do { } while(0) +#define net_family_read_unlock() do { } while(0) +#endif + + +/* + * Statistics counters of the socket lists + */ + +static DEFINE_PER_CPU(int, sockets_in_use) = 0; + +/* + * Support routines. Move socket addresses back and forth across the kernel/user + * divide and look after the messy bits. + */ + +#define MAX_SOCK_ADDR 128 /* 108 for Unix domain - + 16 for IP, 16 for IPX, + 24 for IPv6, + about 80 for AX.25 + must be at least one bigger than + the AF_UNIX size (see net/unix/af_unix.c + :unix_mkname()). + */ + +/** + * 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, void *kaddr) +{ + if(ulen<0||ulen>MAX_SOCK_ADDR) + return -EINVAL; + if(ulen==0) + return 0; + if(copy_from_user(kaddr,uaddr,ulen)) + return -EFAULT; + return 0; +} + +/** + * 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. + */ + +int move_addr_to_user(void *kaddr, int klen, void __user *uaddr, int __user *ulen) +{ + int err; + int len; + + if((err=get_user(len, ulen))) + return err; + if(len>klen) + len=klen; + if(len<0 || len> MAX_SOCK_ADDR) + return -EINVAL; + if(len) + { + if(copy_to_user(uaddr,kaddr,len)) + return -EFAULT; + } + /* + * "fromlen shall refer to the value before truncation.." + * 1003.1g + */ + return __put_user(klen, ulen); +} + +#define SOCKFS_MAGIC 0x534F434B + +static kmem_cache_t * sock_inode_cachep; + +static struct inode *sock_alloc_inode(struct super_block *sb) +{ + struct socket_alloc *ei; + ei = (struct socket_alloc *)kmem_cache_alloc(sock_inode_cachep, SLAB_KERNEL); + if (!ei) + return NULL; + init_waitqueue_head(&ei->socket.wait); + + ei->socket.fasync_list = NULL; + ei->socket.state = SS_UNCONNECTED; + ei->socket.flags = 0; + ei->socket.ops = NULL; + ei->socket.sk = NULL; + ei->socket.file = NULL; + ei->socket.flags = 0; + + return &ei->vfs_inode; +} + +static void sock_destroy_inode(struct inode *inode) +{ + kmem_cache_free(sock_inode_cachep, + container_of(inode, struct socket_alloc, vfs_inode)); +} + +static void init_once(void * foo, kmem_cache_t * cachep, unsigned long flags) +{ + struct socket_alloc *ei = (struct socket_alloc *) foo; + + if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) == + SLAB_CTOR_CONSTRUCTOR) + 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, + init_once, NULL); + if (sock_inode_cachep == NULL) + return -ENOMEM; + return 0; +} + +static struct super_operations sockfs_ops = { + .alloc_inode = sock_alloc_inode, + .destroy_inode =sock_destroy_inode, + .statfs = simple_statfs, +}; + +static struct super_block *sockfs_get_sb(struct file_system_type *fs_type, + int flags, const char *dev_name, void *data) +{ + return get_sb_pseudo(fs_type, "socket:", &sockfs_ops, SOCKFS_MAGIC); +} + +static struct vfsmount *sock_mnt; + +static struct file_system_type sock_fs_type = { + .name = "sockfs", + .get_sb = sockfs_get_sb, + .kill_sb = kill_anon_super, +}; +static int sockfs_delete_dentry(struct dentry *dentry) +{ + return 1; +} +static struct dentry_operations sockfs_dentry_operations = { + .d_delete = sockfs_delete_dentry, +}; + +/* + * Obtains the first available file descriptor and sets it up for use. + * + * This function creates file structure and maps it to fd space + * of 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. + */ + +int sock_map_fd(struct socket *sock) +{ + int fd; + struct qstr this; + char name[32]; + + /* + * Find a file descriptor suitable for return to the user. + */ + + fd = get_unused_fd(); + if (fd >= 0) { + struct file *file = get_empty_filp(); + + if (!file) { + put_unused_fd(fd); + fd = -ENFILE; + goto out; + } + + sprintf(name, "[%lu]", SOCK_INODE(sock)->i_ino); + this.name = name; + this.len = strlen(name); + this.hash = SOCK_INODE(sock)->i_ino; + + file->f_dentry = d_alloc(sock_mnt->mnt_sb->s_root, &this); + if (!file->f_dentry) { + put_filp(file); + put_unused_fd(fd); + fd = -ENOMEM; + goto out; + } + file->f_dentry->d_op = &sockfs_dentry_operations; + d_add(file->f_dentry, SOCK_INODE(sock)); + file->f_vfsmnt = mntget(sock_mnt); + file->f_mapping = file->f_dentry->d_inode->i_mapping; + + sock->file = file; + file->f_op = SOCK_INODE(sock)->i_fop = &socket_file_ops; + file->f_mode = FMODE_READ | FMODE_WRITE; + file->f_flags = O_RDWR; + file->f_pos = 0; + fd_install(fd, file); + } + +out: + return fd; +} + +/** + * 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 inode *inode; + struct socket *sock; + + if (!(file = fget(fd))) + { + *err = -EBADF; + return NULL; + } + + inode = file->f_dentry->d_inode; + if (!S_ISSOCK(inode->i_mode)) { + *err = -ENOTSOCK; + fput(file); + return NULL; + } + + sock = SOCKET_I(inode); + if (sock->file != file) { + printk(KERN_ERR "socki_lookup: socket file changed!\n"); + sock->file = file; + } + return sock; +} + +/** + * 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(sock_mnt->mnt_sb); + if (!inode) + return NULL; + + sock = SOCKET_I(inode); + + inode->i_mode = S_IFSOCK|S_IRWXUGO; + inode->i_uid = current->fsuid; + inode->i_gid = current->fsgid; + + get_cpu_var(sockets_in_use)++; + put_cpu_var(sockets_in_use); + 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; +} + +struct file_operations bad_sock_fops = { + .owner = THIS_MODULE, + .open = sock_no_open, +}; + +/** + * 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 (sock->fasync_list) + printk(KERN_ERR "sock_release: fasync list not empty!\n"); + + get_cpu_var(sockets_in_use)--; + put_cpu_var(sockets_in_use); + if (!sock->file) { + iput(SOCK_INODE(sock)); + return; + } + sock->file=NULL; +} + +static inline int __sock_sendmsg(struct kiocb *iocb, struct socket *sock, + struct msghdr *msg, size_t size) +{ + struct sock_iocb *si = kiocb_to_siocb(iocb); + int err; + + si->sock = sock; + si->scm = NULL; + si->msg = msg; + si->size = size; + + err = security_socket_sendmsg(sock, msg, size); + if (err) + return err; + + return sock->ops->sendmsg(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; +} + +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; +} + +static inline int __sock_recvmsg(struct kiocb *iocb, struct socket *sock, + struct msghdr *msg, size_t size, int flags) +{ + int err; + struct sock_iocb *si = kiocb_to_siocb(iocb); + + si->sock = sock; + si->scm = NULL; + si->msg = msg; + si->size = size; + si->flags = flags; + + err = security_socket_recvmsg(sock, msg, size, flags); + if (err) + return err; + + return sock->ops->recvmsg(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; +} + +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; +} + +static void sock_aio_dtor(struct kiocb *iocb) +{ + kfree(iocb->private); +} + +/* + * Read data from a socket. ubuf is a user mode pointer. We make sure the user + * area ubuf...ubuf+size-1 is writable before asking the protocol. + */ + +static ssize_t sock_aio_read(struct kiocb *iocb, char __user *ubuf, + size_t size, loff_t pos) +{ + struct sock_iocb *x, siocb; + struct socket *sock; + int flags; + + if (pos != 0) + return -ESPIPE; + if (size==0) /* Match SYS5 behaviour */ + return 0; + + if (is_sync_kiocb(iocb)) + x = &siocb; + else { + x = kmalloc(sizeof(struct sock_iocb), GFP_KERNEL); + if (!x) + return -ENOMEM; + iocb->ki_dtor = sock_aio_dtor; + } + iocb->private = x; + x->kiocb = iocb; + sock = SOCKET_I(iocb->ki_filp->f_dentry->d_inode); + + x->async_msg.msg_name = NULL; + x->async_msg.msg_namelen = 0; + x->async_msg.msg_iov = &x->async_iov; + x->async_msg.msg_iovlen = 1; + x->async_msg.msg_control = NULL; + x->async_msg.msg_controllen = 0; + x->async_iov.iov_base = ubuf; + x->async_iov.iov_len = size; + flags = !(iocb->ki_filp->f_flags & O_NONBLOCK) ? 0 : MSG_DONTWAIT; + + return __sock_recvmsg(iocb, sock, &x->async_msg, size, flags); +} + + +/* + * Write data to a socket. We verify that the user area ubuf..ubuf+size-1 + * is readable by the user process. + */ + +static ssize_t sock_aio_write(struct kiocb *iocb, const char __user *ubuf, + size_t size, loff_t pos) +{ + struct sock_iocb *x, siocb; + struct socket *sock; + + if (pos != 0) + return -ESPIPE; + if(size==0) /* Match SYS5 behaviour */ + return 0; + + if (is_sync_kiocb(iocb)) + x = &siocb; + else { + x = kmalloc(sizeof(struct sock_iocb), GFP_KERNEL); + if (!x) + return -ENOMEM; + iocb->ki_dtor = sock_aio_dtor; + } + iocb->private = x; + x->kiocb = iocb; + sock = SOCKET_I(iocb->ki_filp->f_dentry->d_inode); + + x->async_msg.msg_name = NULL; + x->async_msg.msg_namelen = 0; + x->async_msg.msg_iov = &x->async_iov; + x->async_msg.msg_iovlen = 1; + x->async_msg.msg_control = NULL; + x->async_msg.msg_controllen = 0; + x->async_msg.msg_flags = !(iocb->ki_filp->f_flags & O_NONBLOCK) ? 0 : MSG_DONTWAIT; + if (sock->type == SOCK_SEQPACKET) + x->async_msg.msg_flags |= MSG_EOR; + x->async_iov.iov_base = (void __user *)ubuf; + x->async_iov.iov_len = size; + + return __sock_sendmsg(iocb, sock, &x->async_msg, size); +} + +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 = SOCKET_I(file->f_dentry->d_inode); + + flags = !(file->f_flags & O_NONBLOCK) ? 0 : MSG_DONTWAIT; + if (more) + flags |= MSG_MORE; + + return sock->ops->sendpage(sock, page, offset, size, flags); +} + +static int sock_readv_writev(int type, struct inode * inode, + struct file * file, const struct iovec * iov, + long count, size_t size) +{ + struct msghdr msg; + struct socket *sock; + + sock = SOCKET_I(inode); + + 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 = count; + msg.msg_flags = (file->f_flags & O_NONBLOCK) ? MSG_DONTWAIT : 0; + + /* read() does a VERIFY_WRITE */ + if (type == VERIFY_WRITE) + return sock_recvmsg(sock, &msg, size, msg.msg_flags); + + if (sock->type == SOCK_SEQPACKET) + msg.msg_flags |= MSG_EOR; + + return sock_sendmsg(sock, &msg, size); +} + +static ssize_t sock_readv(struct file *file, const struct iovec *vector, + unsigned long count, loff_t *ppos) +{ + size_t tot_len = 0; + int i; + for (i = 0 ; i < count ; i++) + tot_len += vector[i].iov_len; + return sock_readv_writev(VERIFY_WRITE, file->f_dentry->d_inode, + file, vector, count, tot_len); +} + +static ssize_t sock_writev(struct file *file, const struct iovec *vector, + unsigned long count, loff_t *ppos) +{ + size_t tot_len = 0; + int i; + for (i = 0 ; i < count ; i++) + tot_len += vector[i].iov_len; + return sock_readv_writev(VERIFY_READ, file->f_dentry->d_inode, + file, vector, count, tot_len); +} + + +/* + * Atomic setting of ioctl hooks to avoid race + * with module unload. + */ + +static DECLARE_MUTEX(br_ioctl_mutex); +static int (*br_ioctl_hook)(unsigned int cmd, void __user *arg) = NULL; + +void brioctl_set(int (*hook)(unsigned int, void __user *)) +{ + down(&br_ioctl_mutex); + br_ioctl_hook = hook; + up(&br_ioctl_mutex); +} +EXPORT_SYMBOL(brioctl_set); + +static DECLARE_MUTEX(vlan_ioctl_mutex); +static int (*vlan_ioctl_hook)(void __user *arg); + +void vlan_ioctl_set(int (*hook)(void __user *)) +{ + down(&vlan_ioctl_mutex); + vlan_ioctl_hook = hook; + up(&vlan_ioctl_mutex); +} +EXPORT_SYMBOL(vlan_ioctl_set); + +static DECLARE_MUTEX(dlci_ioctl_mutex); +static int (*dlci_ioctl_hook)(unsigned int, void __user *); + +void dlci_ioctl_set(int (*hook)(unsigned int, void __user *)) +{ + down(&dlci_ioctl_mutex); + dlci_ioctl_hook = hook; + up(&dlci_ioctl_mutex); +} +EXPORT_SYMBOL(dlci_ioctl_set); + +/* + * 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; + void __user *argp = (void __user *)arg; + int pid, err; + + sock = SOCKET_I(file->f_dentry->d_inode); + if (cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15)) { + err = dev_ioctl(cmd, argp); + } else +#ifdef WIRELESS_EXT + if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) { + err = dev_ioctl(cmd, argp); + } else +#endif /* WIRELESS_EXT */ + 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(sock->file->f_owner.pid, (int __user *)argp); + break; + case SIOCGIFBR: + case SIOCSIFBR: + case SIOCBRADDBR: + case SIOCBRDELBR: + err = -ENOPKG; + if (!br_ioctl_hook) + request_module("bridge"); + + down(&br_ioctl_mutex); + if (br_ioctl_hook) + err = br_ioctl_hook(cmd, argp); + up(&br_ioctl_mutex); + break; + case SIOCGIFVLAN: + case SIOCSIFVLAN: + err = -ENOPKG; + if (!vlan_ioctl_hook) + request_module("8021q"); + + down(&vlan_ioctl_mutex); + if (vlan_ioctl_hook) + err = vlan_ioctl_hook(argp); + up(&vlan_ioctl_mutex); + break; + case SIOCGIFDIVERT: + case SIOCSIFDIVERT: + /* Convert this to call through a hook */ + err = divert_ioctl(cmd, argp); + break; + case SIOCADDDLCI: + case SIOCDELDLCI: + err = -ENOPKG; + if (!dlci_ioctl_hook) + request_module("dlci"); + + if (dlci_ioctl_hook) { + down(&dlci_ioctl_mutex); + err = dlci_ioctl_hook(cmd, argp); + up(&dlci_ioctl_mutex); + } + break; + default: + err = sock->ops->ioctl(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; + } + + security_socket_post_create(sock, family, type, protocol, 1); + sock->type = type; +out: + *res = sock; + return err; +} + +/* 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 = SOCKET_I(file->f_dentry->d_inode); + return sock->ops->poll(file, sock, wait); +} + +static int sock_mmap(struct file * file, struct vm_area_struct * vma) +{ + struct socket *sock = SOCKET_I(file->f_dentry->d_inode); + + return sock->ops->mmap(file, sock, vma); +} + +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_fasync(-1, filp, 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. + * 3. fasync_list can be used from softirq context, so that + * modification under socket lock have to be enhanced with + * write_lock_bh(&sk->sk_callback_lock). + * --ANK (990710) + */ + +static int sock_fasync(int fd, struct file *filp, int on) +{ + struct fasync_struct *fa, *fna=NULL, **prev; + struct socket *sock; + struct sock *sk; + + if (on) + { + fna=(struct fasync_struct *)kmalloc(sizeof(struct fasync_struct), GFP_KERNEL); + if(fna==NULL) + return -ENOMEM; + } + + sock = SOCKET_I(filp->f_dentry->d_inode); + + if ((sk=sock->sk) == NULL) { + kfree(fna); + return -EINVAL; + } + + lock_sock(sk); + + prev=&(sock->fasync_list); + + for (fa=*prev; fa!=NULL; prev=&fa->fa_next,fa=*prev) + if (fa->fa_file==filp) + break; + + if(on) + { + if(fa!=NULL) + { + write_lock_bh(&sk->sk_callback_lock); + fa->fa_fd=fd; + write_unlock_bh(&sk->sk_callback_lock); + + kfree(fna); + goto out; + } + fna->fa_file=filp; + fna->fa_fd=fd; + fna->magic=FASYNC_MAGIC; + fna->fa_next=sock->fasync_list; + write_lock_bh(&sk->sk_callback_lock); + sock->fasync_list=fna; + write_unlock_bh(&sk->sk_callback_lock); + } + else + { + if (fa!=NULL) + { + write_lock_bh(&sk->sk_callback_lock); + *prev=fa->fa_next; + write_unlock_bh(&sk->sk_callback_lock); + kfree(fa); + } + } + +out: + release_sock(sock->sk); + return 0; +} + +/* This function may be called only under socket lock or callback_lock */ + +int sock_wake_async(struct socket *sock, int how, int band) +{ + if (!sock || !sock->fasync_list) + return -1; + switch (how) + { + case 1: + + if (test_bit(SOCK_ASYNC_WAITDATA, &sock->flags)) + break; + goto call_kill; + case 2: + if (!test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags)) + break; + /* fall through */ + case 0: + call_kill: + __kill_fasync(sock->fasync_list, SIGIO, band); + break; + case 3: + __kill_fasync(sock->fasync_list, SIGURG, band); + } + return 0; +} + +static int __sock_create(int family, int type, int protocol, struct socket **res, int kern) +{ + int err; + struct socket *sock; + + /* + * 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; + +#if defined(CONFIG_KMOD) + /* 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 (net_families[family]==NULL) + { + request_module("net-pf-%d",family); + } +#endif + + net_family_read_lock(); + if (net_families[family] == NULL) { + err = -EAFNOSUPPORT; + goto out; + } + +/* + * 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. + */ + + if (!(sock = sock_alloc())) { + printk(KERN_WARNING "socket: no more sockets\n"); + err = -ENFILE; /* Not exactly a match, but its the + closest posix thing */ + goto out; + } + + sock->type = type; + + /* + * We will call the ->create function, that possibly is in a loadable + * module, so we have to bump that loadable module refcnt first. + */ + err = -EAFNOSUPPORT; + if (!try_module_get(net_families[family]->owner)) + goto out_release; + + if ((err = net_families[family]->create(sock, protocol)) < 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)) { + sock->ops = NULL; + goto out_module_put; + } + /* + * Now that we're done with the ->create function, the [loadable] + * module can have its refcnt decremented + */ + module_put(net_families[family]->owner); + *res = sock; + security_socket_post_create(sock, family, type, protocol, kern); + +out: + net_family_read_unlock(); + return err; +out_module_put: + module_put(net_families[family]->owner); +out_release: + sock_release(sock); + goto out; +} + +int sock_create(int family, int type, int protocol, struct socket **res) +{ + return __sock_create(family, type, protocol, res, 0); +} + +int sock_create_kern(int family, int type, int protocol, struct socket **res) +{ + return __sock_create(family, type, protocol, res, 1); +} + +asmlinkage long sys_socket(int family, int type, int protocol) +{ + int retval; + struct socket *sock; + + retval = sock_create(family, type, protocol, &sock); + if (retval < 0) + goto out; + + retval = sock_map_fd(sock); + 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. + */ + +asmlinkage long sys_socketpair(int family, int type, int protocol, int __user *usockvec) +{ + struct socket *sock1, *sock2; + int fd1, fd2, err; + + /* + * 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 = fd2 = -1; + + err = sock_map_fd(sock1); + if (err < 0) + goto out_release_both; + fd1 = err; + + err = sock_map_fd(sock2); + if (err < 0) + goto out_close_1; + fd2 = err; + + /* 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_close_1: + sock_release(sock2); + 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). + */ + +asmlinkage long sys_bind(int fd, struct sockaddr __user *umyaddr, int addrlen) +{ + struct socket *sock; + char address[MAX_SOCK_ADDR]; + int err; + + if((sock = sockfd_lookup(fd,&err))!=NULL) + { + if((err=move_addr_to_kernel(umyaddr,addrlen,address))>=0) { + err = security_socket_bind(sock, (struct sockaddr *)address, addrlen); + if (err) { + sockfd_put(sock); + return err; + } + err = sock->ops->bind(sock, (struct sockaddr *)address, addrlen); + } + sockfd_put(sock); + } + 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. + */ + +int sysctl_somaxconn = SOMAXCONN; + +asmlinkage long sys_listen(int fd, int backlog) +{ + struct socket *sock; + int err; + + if ((sock = sockfd_lookup(fd, &err)) != NULL) { + if ((unsigned) backlog > sysctl_somaxconn) + backlog = sysctl_somaxconn; + + err = security_socket_listen(sock, backlog); + if (err) { + sockfd_put(sock); + return err; + } + + err=sock->ops->listen(sock, backlog); + sockfd_put(sock); + } + 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. + */ + +asmlinkage long sys_accept(int fd, struct sockaddr __user *upeer_sockaddr, int __user *upeer_addrlen) +{ + struct socket *sock, *newsock; + int err, len; + char address[MAX_SOCK_ADDR]; + + sock = sockfd_lookup(fd, &err); + if (!sock) + goto out; + + err = -ENFILE; + if (!(newsock = sock_alloc())) + goto out_put; + + newsock->type = sock->type; + newsock->ops = sock->ops; + + err = security_socket_accept(sock, newsock); + if (err) + goto out_release; + + /* + * 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); + + err = sock->ops->accept(sock, newsock, sock->file->f_flags); + if (err < 0) + goto out_release; + + if (upeer_sockaddr) { + if(newsock->ops->getname(newsock, (struct sockaddr *)address, &len, 2)<0) { + err = -ECONNABORTED; + goto out_release; + } + err = move_addr_to_user(address, len, upeer_sockaddr, upeer_addrlen); + if (err < 0) + goto out_release; + } + + /* File flags are not inherited via accept() unlike another OSes. */ + + if ((err = sock_map_fd(newsock)) < 0) + goto out_release; + + security_socket_post_accept(sock, newsock); + +out_put: + sockfd_put(sock); +out: + return err; +out_release: + sock_release(newsock); + goto out_put; +} + + +/* + * 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. + */ + +asmlinkage long sys_connect(int fd, struct sockaddr __user *uservaddr, int addrlen) +{ + struct socket *sock; + char address[MAX_SOCK_ADDR]; + int err; + + sock = sockfd_lookup(fd, &err); + 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: + sockfd_put(sock); +out: + return err; +} + +/* + * Get the local address ('name') of a socket object. Move the obtained + * name to user space. + */ + +asmlinkage long sys_getsockname(int fd, struct sockaddr __user *usockaddr, int __user *usockaddr_len) +{ + struct socket *sock; + char address[MAX_SOCK_ADDR]; + int len, err; + + sock = sockfd_lookup(fd, &err); + 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: + sockfd_put(sock); +out: + return err; +} + +/* + * Get the remote address ('name') of a socket object. Move the obtained + * name to user space. + */ + +asmlinkage long sys_getpeername(int fd, struct sockaddr __user *usockaddr, int __user *usockaddr_len) +{ + struct socket *sock; + char address[MAX_SOCK_ADDR]; + int len, err; + + if ((sock = sockfd_lookup(fd, &err))!=NULL) + { + err = security_socket_getpeername(sock); + if (err) { + sockfd_put(sock); + return err; + } + + err = sock->ops->getname(sock, (struct sockaddr *)address, &len, 1); + if (!err) + err=move_addr_to_user(address,len, usockaddr, usockaddr_len); + sockfd_put(sock); + } + 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. + */ + +asmlinkage long sys_sendto(int fd, void __user * buff, size_t len, unsigned flags, + struct sockaddr __user *addr, int addr_len) +{ + struct socket *sock; + char address[MAX_SOCK_ADDR]; + int err; + struct msghdr msg; + struct iovec iov; + + sock = sockfd_lookup(fd, &err); + 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=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: + sockfd_put(sock); +out: + return err; +} + +/* + * Send a datagram down a socket. + */ + +asmlinkage long sys_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. + */ + +asmlinkage long sys_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; + char address[MAX_SOCK_ADDR]; + int err,err2; + + sock = sockfd_lookup(fd, &err); + 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=address; + msg.msg_namelen=MAX_SOCK_ADDR; + 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; + } + sockfd_put(sock); +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. + */ + +asmlinkage long sys_setsockopt(int fd, int level, int optname, char __user *optval, int optlen) +{ + int err; + struct socket *sock; + + if (optlen < 0) + return -EINVAL; + + if ((sock = sockfd_lookup(fd, &err))!=NULL) + { + err = security_socket_setsockopt(sock,level,optname); + if (err) { + sockfd_put(sock); + return err; + } + + if (level == SOL_SOCKET) + err=sock_setsockopt(sock,level,optname,optval,optlen); + else + err=sock->ops->setsockopt(sock, level, optname, optval, optlen); + sockfd_put(sock); + } + 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. + */ + +asmlinkage long sys_getsockopt(int fd, int level, int optname, char __user *optval, int __user *optlen) +{ + int err; + struct socket *sock; + + if ((sock = sockfd_lookup(fd, &err))!=NULL) + { + err = security_socket_getsockopt(sock, level, + optname); + if (err) { + sockfd_put(sock); + return err; + } + + if (level == SOL_SOCKET) + err=sock_getsockopt(sock,level,optname,optval,optlen); + else + err=sock->ops->getsockopt(sock, level, optname, optval, optlen); + sockfd_put(sock); + } + return err; +} + + +/* + * Shutdown a socket. + */ + +asmlinkage long sys_shutdown(int fd, int how) +{ + int err; + struct socket *sock; + + if ((sock = sockfd_lookup(fd, &err))!=NULL) + { + err = security_socket_shutdown(sock, how); + if (err) { + sockfd_put(sock); + return err; + } + + err=sock->ops->shutdown(sock, how); + sockfd_put(sock); + } + 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) + + +/* + * BSD sendmsg interface + */ + +asmlinkage long sys_sendmsg(int fd, struct msghdr __user *msg, unsigned flags) +{ + struct compat_msghdr __user *msg_compat = (struct compat_msghdr __user *)msg; + struct socket *sock; + char address[MAX_SOCK_ADDR]; + struct iovec iovstack[UIO_FASTIOV], *iov = iovstack; + unsigned char ctl[sizeof(struct cmsghdr) + 20]; /* 20 is size of ipv6_pktinfo */ + unsigned char *ctl_buf = ctl; + struct msghdr msg_sys; + 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; + + sock = sockfd_lookup(fd, &err); + if (!sock) + goto out; + + /* do not move before msg_sys is valid */ + err = -EMSGSIZE; + if (msg_sys.msg_iovlen > UIO_MAXIOV) + goto out_put; + + /* 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_put; + } + + /* 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, ctl, sizeof(ctl)); + if (err) + goto out_freeiov; + ctl_buf = msg_sys.msg_control; + } 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 *) 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; + err = sock_sendmsg(sock, &msg_sys, total_len); + +out_freectl: + if (ctl_buf != ctl) + sock_kfree_s(sock->sk, ctl_buf, ctl_len); +out_freeiov: + if (iov != iovstack) + sock_kfree_s(sock->sk, iov, iov_size); +out_put: + sockfd_put(sock); +out: + return err; +} + +/* + * BSD recvmsg interface + */ + +asmlinkage long sys_recvmsg(int fd, struct msghdr __user *msg, unsigned int flags) +{ + struct compat_msghdr __user *msg_compat = (struct compat_msghdr __user *)msg; + struct socket *sock; + struct iovec iovstack[UIO_FASTIOV]; + struct iovec *iov=iovstack; + struct msghdr msg_sys; + unsigned long cmsg_ptr; + int err, iov_size, total_len, len; + + /* kernel mode address */ + char addr[MAX_SOCK_ADDR]; + + /* user mode address pointers */ + struct sockaddr __user *uaddr; + int __user *uaddr_len; + + if (MSG_CMSG_COMPAT & flags) { + if (get_compat_msghdr(&msg_sys, msg_compat)) + return -EFAULT; + } else + if (copy_from_user(&msg_sys,msg,sizeof(struct msghdr))) + return -EFAULT; + + sock = sockfd_lookup(fd, &err); + if (!sock) + goto out; + + err = -EMSGSIZE; + if (msg_sys.msg_iovlen > UIO_MAXIOV) + goto out_put; + + /* 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_put; + } + + /* + * Save the user-mode address (verify_iovec will change the + * kernel msghdr to use the kernel address space) + */ + + uaddr = (void __user *) msg_sys.msg_name; + uaddr_len = COMPAT_NAMELEN(msg); + if (MSG_CMSG_COMPAT & flags) { + err = verify_compat_iovec(&msg_sys, iov, addr, VERIFY_WRITE); + } else + err = verify_iovec(&msg_sys, iov, addr, VERIFY_WRITE); + if (err < 0) + goto out_freeiov; + total_len=err; + + cmsg_ptr = (unsigned long)msg_sys.msg_control; + msg_sys.msg_flags = 0; + if (MSG_CMSG_COMPAT & flags) + msg_sys.msg_flags = MSG_CMSG_COMPAT; + + if (sock->file->f_flags & O_NONBLOCK) + flags |= MSG_DONTWAIT; + err = 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, COMPAT_FLAGS(msg)); + if (err) + goto out_freeiov; + if (MSG_CMSG_COMPAT & flags) + err = __put_user((unsigned long)msg_sys.msg_control-cmsg_ptr, + &msg_compat->msg_controllen); + else + err = __put_user((unsigned long)msg_sys.msg_control-cmsg_ptr, + &msg->msg_controllen); + if (err) + goto out_freeiov; + err = len; + +out_freeiov: + if (iov != iovstack) + sock_kfree_s(sock->sk, iov, iov_size); +out_put: + sockfd_put(sock); +out: + return err; +} + +#ifdef __ARCH_WANT_SYS_SOCKETCALL + +/* Argument list sizes for sys_socketcall */ +#define AL(x) ((x) * sizeof(unsigned long)) +static unsigned char nargs[18]={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)}; +#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. + */ + +asmlinkage long sys_socketcall(int call, unsigned long __user *args) +{ + unsigned long a[6]; + unsigned long a0,a1; + int err; + + if(call<1||call>SYS_RECVMSG) + return -EINVAL; + + /* copy_from_user should be SMP safe. */ + if (copy_from_user(a, args, nargs[call])) + return -EFAULT; + + 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_accept(a0,(struct sockaddr __user *)a1, (int __user *)a[2]); + break; + case SYS_GETSOCKNAME: + err = sys_getsockname(a0,(struct sockaddr __user *)a1, (int __user *)a[2]); + break; + case SYS_GETPEERNAME: + err = sys_getpeername(a0, (struct sockaddr __user *)a1, (int __user *)a[2]); + break; + case SYS_SOCKETPAIR: + err = sys_socketpair(a0,a1, a[2], (int __user *)a[3]); + break; + case SYS_SEND: + err = sys_send(a0, (void __user *)a1, a[2], a[3]); + break; + case SYS_SENDTO: + err = sys_sendto(a0,(void __user *)a1, a[2], a[3], + (struct sockaddr __user *)a[4], a[5]); + break; + case SYS_RECV: + err = sys_recv(a0, (void __user *)a1, a[2], a[3]); + break; + case SYS_RECVFROM: + err = sys_recvfrom(a0, (void __user *)a1, a[2], a[3], + (struct sockaddr __user *)a[4], (int __user *)a[5]); + break; + case SYS_SHUTDOWN: + err = sys_shutdown(a0,a1); + break; + case SYS_SETSOCKOPT: + err = sys_setsockopt(a0, a1, a[2], (char __user *)a[3], a[4]); + break; + case SYS_GETSOCKOPT: + err = sys_getsockopt(a0, a1, a[2], (char __user *)a[3], (int __user *)a[4]); + break; + case SYS_SENDMSG: + err = sys_sendmsg(a0, (struct msghdr __user *) a1, a[2]); + break; + case SYS_RECVMSG: + err = sys_recvmsg(a0, (struct msghdr __user *) a1, a[2]); + break; + default: + err = -EINVAL; + break; + } + return err; +} + +#endif /* __ARCH_WANT_SYS_SOCKETCALL */ + +/* + * This function is called by a protocol handler that wants to + * advertise its address family, and have it linked into the + * SOCKET module. + */ + +int sock_register(struct net_proto_family *ops) +{ + int err; + + if (ops->family >= NPROTO) { + printk(KERN_CRIT "protocol %d >= NPROTO(%d)\n", ops->family, NPROTO); + return -ENOBUFS; + } + net_family_write_lock(); + err = -EEXIST; + if (net_families[ops->family] == NULL) { + net_families[ops->family]=ops; + err = 0; + } + net_family_write_unlock(); + printk(KERN_INFO "NET: Registered protocol family %d\n", + ops->family); + return err; +} + +/* + * This function is called by a protocol handler that wants to + * remove its address family, and have it unlinked from the + * SOCKET module. + */ + +int sock_unregister(int family) +{ + if (family < 0 || family >= NPROTO) + return -1; + + net_family_write_lock(); + net_families[family]=NULL; + net_family_write_unlock(); + printk(KERN_INFO "NET: Unregistered protocol family %d\n", + family); + return 0; +} + + +extern void sk_init(void); + +void __init sock_init(void) +{ + /* + * Initialize sock SLAB cache. + */ + + sk_init(); + +#ifdef SLAB_SKB + /* + * Initialize skbuff SLAB cache + */ + skb_init(); +#endif + + /* + * Initialize the protocols module. + */ + + init_inodecache(); + register_filesystem(&sock_fs_type); + sock_mnt = kern_mount(&sock_fs_type); + /* The real protocol initialization is performed when + * do_initcalls is run. + */ + +#ifdef CONFIG_NETFILTER + netfilter_init(); +#endif +} + +#ifdef CONFIG_PROC_FS +void socket_seq_show(struct seq_file *seq) +{ + int cpu; + int counter = 0; + + for (cpu = 0; cpu < NR_CPUS; 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 */ + +/* ABI emulation layers need these two */ +EXPORT_SYMBOL(move_addr_to_kernel); +EXPORT_SYMBOL(move_addr_to_user); +EXPORT_SYMBOL(sock_create); +EXPORT_SYMBOL(sock_create_kern); +EXPORT_SYMBOL(sock_create_lite); +EXPORT_SYMBOL(sock_map_fd); +EXPORT_SYMBOL(sock_recvmsg); +EXPORT_SYMBOL(sock_register); +EXPORT_SYMBOL(sock_release); +EXPORT_SYMBOL(sock_sendmsg); +EXPORT_SYMBOL(sock_unregister); +EXPORT_SYMBOL(sock_wake_async); +EXPORT_SYMBOL(sockfd_lookup); +EXPORT_SYMBOL(kernel_sendmsg); +EXPORT_SYMBOL(kernel_recvmsg); |