2 * NET An implementation of the SOCKET network access protocol.
4 * Version: @(#)socket.c 1.1.93 18/02/95
6 * Authors: Orest Zborowski, <obz@Kodak.COM>
8 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
11 * Anonymous : NOTSOCK/BADF cleanup. Error fix in
13 * Alan Cox : verify_area() fixes
14 * Alan Cox : Removed DDI
15 * Jonathan Kamens : SOCK_DGRAM reconnect bug
16 * Alan Cox : Moved a load of checks to the very
18 * Alan Cox : Move address structures to/from user
19 * mode above the protocol layers.
20 * Rob Janssen : Allow 0 length sends.
21 * Alan Cox : Asynchronous I/O support (cribbed from the
23 * Niibe Yutaka : Asynchronous I/O for writes (4.4BSD style)
24 * Jeff Uphoff : Made max number of sockets command-line
26 * Matti Aarnio : Made the number of sockets dynamic,
27 * to be allocated when needed, and mr.
28 * Uphoff's max is used as max to be
29 * allowed to allocate.
30 * Linus : Argh. removed all the socket allocation
31 * altogether: it's in the inode now.
32 * Alan Cox : Made sock_alloc()/sock_release() public
33 * for NetROM and future kernel nfsd type
35 * Alan Cox : sendmsg/recvmsg basics.
36 * Tom Dyas : Export net symbols.
37 * Marcin Dalecki : Fixed problems with CONFIG_NET="n".
38 * Alan Cox : Added thread locking to sys_* calls
39 * for sockets. May have errors at the
41 * Kevin Buhr : Fixed the dumb errors in the above.
42 * Andi Kleen : Some small cleanups, optimizations,
43 * and fixed a copy_from_user() bug.
44 * Tigran Aivazian : sys_send(args) calls sys_sendto(args, NULL, 0)
45 * Tigran Aivazian : Made listen(2) backlog sanity checks
46 * protocol-independent
49 * This program is free software; you can redistribute it and/or
50 * modify it under the terms of the GNU General Public License
51 * as published by the Free Software Foundation; either version
52 * 2 of the License, or (at your option) any later version.
55 * This module is effectively the top level interface to the BSD socket
58 * Based upon Swansea University Computer Society NET3.039
62 #include <linux/smp_lock.h>
63 #include <linux/socket.h>
64 #include <linux/file.h>
65 #include <linux/net.h>
66 #include <linux/interrupt.h>
67 #include <linux/netdevice.h>
68 #include <linux/proc_fs.h>
69 #include <linux/seq_file.h>
70 #include <linux/mutex.h>
71 #include <linux/wanrouter.h>
72 #include <linux/if_bridge.h>
73 #include <linux/if_frad.h>
74 #include <linux/if_vlan.h>
75 #include <linux/init.h>
76 #include <linux/poll.h>
77 #include <linux/cache.h>
78 #include <linux/module.h>
79 #include <linux/highmem.h>
80 #include <linux/divert.h>
81 #include <linux/mount.h>
82 #include <linux/security.h>
83 #include <linux/syscalls.h>
84 #include <linux/compat.h>
85 #include <linux/kmod.h>
86 #include <linux/audit.h>
87 #include <linux/wireless.h>
89 #include <asm/uaccess.h>
90 #include <asm/unistd.h>
92 #include <net/compat.h>
95 #include <linux/netfilter.h>
97 static int sock_no_open(struct inode *irrelevant, struct file *dontcare);
98 static ssize_t sock_aio_read(struct kiocb *iocb, char __user *buf,
99 size_t size, loff_t pos);
100 static ssize_t sock_aio_write(struct kiocb *iocb, const char __user *buf,
101 size_t size, loff_t pos);
102 static int sock_mmap(struct file *file, struct vm_area_struct *vma);
104 static int sock_close(struct inode *inode, struct file *file);
105 static unsigned int sock_poll(struct file *file,
106 struct poll_table_struct *wait);
107 static long sock_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
109 static long compat_sock_ioctl(struct file *file,
110 unsigned int cmd, unsigned long arg);
112 static int sock_fasync(int fd, struct file *filp, int on);
113 static ssize_t sock_readv(struct file *file, const struct iovec *vector,
114 unsigned long count, loff_t *ppos);
115 static ssize_t sock_writev(struct file *file, const struct iovec *vector,
116 unsigned long count, loff_t *ppos);
117 static ssize_t sock_sendpage(struct file *file, struct page *page,
118 int offset, size_t size, loff_t *ppos, int more);
121 * Socket files have a set of 'special' operations as well as the generic file ones. These don't appear
122 * in the operation structures but are done directly via the socketcall() multiplexor.
125 static struct file_operations socket_file_ops = {
126 .owner = THIS_MODULE,
128 .aio_read = sock_aio_read,
129 .aio_write = sock_aio_write,
131 .unlocked_ioctl = sock_ioctl,
133 .compat_ioctl = compat_sock_ioctl,
136 .open = sock_no_open, /* special open code to disallow open via /proc */
137 .release = sock_close,
138 .fasync = sock_fasync,
140 .writev = sock_writev,
141 .sendpage = sock_sendpage,
142 .splice_write = generic_splice_sendpage,
146 * The protocol list. Each protocol is registered in here.
149 static struct net_proto_family *net_families[NPROTO];
151 #if defined(CONFIG_SMP) || defined(CONFIG_PREEMPT)
152 static atomic_t net_family_lockct = ATOMIC_INIT(0);
153 static DEFINE_SPINLOCK(net_family_lock);
155 /* The strategy is: modifications net_family vector are short, do not
156 sleep and veeery rare, but read access should be free of any exclusive
160 static void net_family_write_lock(void)
162 spin_lock(&net_family_lock);
163 while (atomic_read(&net_family_lockct) != 0) {
164 spin_unlock(&net_family_lock);
168 spin_lock(&net_family_lock);
172 static __inline__ void net_family_write_unlock(void)
174 spin_unlock(&net_family_lock);
177 static __inline__ void net_family_read_lock(void)
179 atomic_inc(&net_family_lockct);
180 spin_unlock_wait(&net_family_lock);
183 static __inline__ void net_family_read_unlock(void)
185 atomic_dec(&net_family_lockct);
189 #define net_family_write_lock() do { } while(0)
190 #define net_family_write_unlock() do { } while(0)
191 #define net_family_read_lock() do { } while(0)
192 #define net_family_read_unlock() do { } while(0)
196 * Statistics counters of the socket lists
199 static DEFINE_PER_CPU(int, sockets_in_use) = 0;
203 * Move socket addresses back and forth across the kernel/user
204 * divide and look after the messy bits.
207 #define MAX_SOCK_ADDR 128 /* 108 for Unix domain -
208 16 for IP, 16 for IPX,
211 must be at least one bigger than
212 the AF_UNIX size (see net/unix/af_unix.c
217 * move_addr_to_kernel - copy a socket address into kernel space
218 * @uaddr: Address in user space
219 * @kaddr: Address in kernel space
220 * @ulen: Length in user space
222 * The address is copied into kernel space. If the provided address is
223 * too long an error code of -EINVAL is returned. If the copy gives
224 * invalid addresses -EFAULT is returned. On a success 0 is returned.
227 int move_addr_to_kernel(void __user *uaddr, int ulen, void *kaddr)
229 if (ulen < 0 || ulen > MAX_SOCK_ADDR)
233 if (copy_from_user(kaddr, uaddr, ulen))
235 return audit_sockaddr(ulen, kaddr);
239 * move_addr_to_user - copy an address to user space
240 * @kaddr: kernel space address
241 * @klen: length of address in kernel
242 * @uaddr: user space address
243 * @ulen: pointer to user length field
245 * The value pointed to by ulen on entry is the buffer length available.
246 * This is overwritten with the buffer space used. -EINVAL is returned
247 * if an overlong buffer is specified or a negative buffer size. -EFAULT
248 * is returned if either the buffer or the length field are not
250 * After copying the data up to the limit the user specifies, the true
251 * length of the data is written over the length limit the user
252 * specified. Zero is returned for a success.
255 int move_addr_to_user(void *kaddr, int klen, void __user *uaddr,
261 err = get_user(len, ulen);
266 if (len < 0 || len > MAX_SOCK_ADDR)
269 if (audit_sockaddr(klen, kaddr))
271 if (copy_to_user(uaddr, kaddr, len))
275 * "fromlen shall refer to the value before truncation.."
278 return __put_user(klen, ulen);
281 #define SOCKFS_MAGIC 0x534F434B
283 static kmem_cache_t *sock_inode_cachep __read_mostly;
285 static struct inode *sock_alloc_inode(struct super_block *sb)
287 struct socket_alloc *ei;
289 ei = kmem_cache_alloc(sock_inode_cachep, SLAB_KERNEL);
292 init_waitqueue_head(&ei->socket.wait);
294 ei->socket.fasync_list = NULL;
295 ei->socket.state = SS_UNCONNECTED;
296 ei->socket.flags = 0;
297 ei->socket.ops = NULL;
298 ei->socket.sk = NULL;
299 ei->socket.file = NULL;
300 ei->socket.flags = 0;
302 return &ei->vfs_inode;
305 static void sock_destroy_inode(struct inode *inode)
307 kmem_cache_free(sock_inode_cachep,
308 container_of(inode, struct socket_alloc, vfs_inode));
311 static void init_once(void *foo, kmem_cache_t *cachep, unsigned long flags)
313 struct socket_alloc *ei = (struct socket_alloc *)foo;
315 if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR))
316 == SLAB_CTOR_CONSTRUCTOR)
317 inode_init_once(&ei->vfs_inode);
320 static int init_inodecache(void)
322 sock_inode_cachep = kmem_cache_create("sock_inode_cache",
323 sizeof(struct socket_alloc),
325 (SLAB_HWCACHE_ALIGN |
326 SLAB_RECLAIM_ACCOUNT |
330 if (sock_inode_cachep == NULL)
335 static struct super_operations sockfs_ops = {
336 .alloc_inode = sock_alloc_inode,
337 .destroy_inode =sock_destroy_inode,
338 .statfs = simple_statfs,
341 static int sockfs_get_sb(struct file_system_type *fs_type,
342 int flags, const char *dev_name, void *data,
343 struct vfsmount *mnt)
345 return get_sb_pseudo(fs_type, "socket:", &sockfs_ops, SOCKFS_MAGIC,
349 static struct vfsmount *sock_mnt __read_mostly;
351 static struct file_system_type sock_fs_type = {
353 .get_sb = sockfs_get_sb,
354 .kill_sb = kill_anon_super,
357 static int sockfs_delete_dentry(struct dentry *dentry)
361 static struct dentry_operations sockfs_dentry_operations = {
362 .d_delete = sockfs_delete_dentry,
366 * Obtains the first available file descriptor and sets it up for use.
368 * These functions create file structures and maps them to fd space
369 * of the current process. On success it returns file descriptor
370 * and file struct implicitly stored in sock->file.
371 * Note that another thread may close file descriptor before we return
372 * from this function. We use the fact that now we do not refer
373 * to socket after mapping. If one day we will need it, this
374 * function will increment ref. count on file by 1.
376 * In any case returned fd MAY BE not valid!
377 * This race condition is unavoidable
378 * with shared fd spaces, we cannot solve it inside kernel,
379 * but we take care of internal coherence yet.
382 static int sock_alloc_fd(struct file **filep)
386 fd = get_unused_fd();
387 if (likely(fd >= 0)) {
388 struct file *file = get_empty_filp();
391 if (unlikely(!file)) {
400 static int sock_attach_fd(struct socket *sock, struct file *file)
405 this.len = sprintf(name, "[%lu]", SOCK_INODE(sock)->i_ino);
407 this.hash = SOCK_INODE(sock)->i_ino;
409 file->f_dentry = d_alloc(sock_mnt->mnt_sb->s_root, &this);
410 if (unlikely(!file->f_dentry))
413 file->f_dentry->d_op = &sockfs_dentry_operations;
414 d_add(file->f_dentry, SOCK_INODE(sock));
415 file->f_vfsmnt = mntget(sock_mnt);
416 file->f_mapping = file->f_dentry->d_inode->i_mapping;
419 file->f_op = SOCK_INODE(sock)->i_fop = &socket_file_ops;
420 file->f_mode = FMODE_READ | FMODE_WRITE;
421 file->f_flags = O_RDWR;
423 file->private_data = sock;
428 int sock_map_fd(struct socket *sock)
430 struct file *newfile;
431 int fd = sock_alloc_fd(&newfile);
433 if (likely(fd >= 0)) {
434 int err = sock_attach_fd(sock, newfile);
436 if (unlikely(err < 0)) {
441 fd_install(fd, newfile);
446 static struct socket *sock_from_file(struct file *file, int *err)
451 if (file->f_op == &socket_file_ops)
452 return file->private_data; /* set in sock_map_fd */
454 inode = file->f_dentry->d_inode;
455 if (!S_ISSOCK(inode->i_mode)) {
460 sock = SOCKET_I(inode);
461 if (sock->file != file) {
462 printk(KERN_ERR "socki_lookup: socket file changed!\n");
469 * sockfd_lookup - Go from a file number to its socket slot
471 * @err: pointer to an error code return
473 * The file handle passed in is locked and the socket it is bound
474 * too is returned. If an error occurs the err pointer is overwritten
475 * with a negative errno code and NULL is returned. The function checks
476 * for both invalid handles and passing a handle which is not a socket.
478 * On a success the socket object pointer is returned.
481 struct socket *sockfd_lookup(int fd, int *err)
492 sock = sock_from_file(file, err);
498 static struct socket *sockfd_lookup_light(int fd, int *err, int *fput_needed)
504 file = fget_light(fd, fput_needed);
506 sock = sock_from_file(file, err);
509 fput_light(file, *fput_needed);
515 * sock_alloc - allocate a socket
517 * Allocate a new inode and socket object. The two are bound together
518 * and initialised. The socket is then returned. If we are out of inodes
522 static struct socket *sock_alloc(void)
527 inode = new_inode(sock_mnt->mnt_sb);
531 sock = SOCKET_I(inode);
533 inode->i_mode = S_IFSOCK | S_IRWXUGO;
534 inode->i_uid = current->fsuid;
535 inode->i_gid = current->fsgid;
537 get_cpu_var(sockets_in_use)++;
538 put_cpu_var(sockets_in_use);
543 * In theory you can't get an open on this inode, but /proc provides
544 * a back door. Remember to keep it shut otherwise you'll let the
545 * creepy crawlies in.
548 static int sock_no_open(struct inode *irrelevant, struct file *dontcare)
553 const struct file_operations bad_sock_fops = {
554 .owner = THIS_MODULE,
555 .open = sock_no_open,
559 * sock_release - close a socket
560 * @sock: socket to close
562 * The socket is released from the protocol stack if it has a release
563 * callback, and the inode is then released if the socket is bound to
564 * an inode not a file.
567 void sock_release(struct socket *sock)
570 struct module *owner = sock->ops->owner;
572 sock->ops->release(sock);
577 if (sock->fasync_list)
578 printk(KERN_ERR "sock_release: fasync list not empty!\n");
580 get_cpu_var(sockets_in_use)--;
581 put_cpu_var(sockets_in_use);
583 iput(SOCK_INODE(sock));
589 static inline int __sock_sendmsg(struct kiocb *iocb, struct socket *sock,
590 struct msghdr *msg, size_t size)
592 struct sock_iocb *si = kiocb_to_siocb(iocb);
600 err = security_socket_sendmsg(sock, msg, size);
604 return sock->ops->sendmsg(iocb, sock, msg, size);
607 int sock_sendmsg(struct socket *sock, struct msghdr *msg, size_t size)
610 struct sock_iocb siocb;
613 init_sync_kiocb(&iocb, NULL);
614 iocb.private = &siocb;
615 ret = __sock_sendmsg(&iocb, sock, msg, size);
616 if (-EIOCBQUEUED == ret)
617 ret = wait_on_sync_kiocb(&iocb);
621 int kernel_sendmsg(struct socket *sock, struct msghdr *msg,
622 struct kvec *vec, size_t num, size_t size)
624 mm_segment_t oldfs = get_fs();
629 * the following is safe, since for compiler definitions of kvec and
630 * iovec are identical, yielding the same in-core layout and alignment
632 msg->msg_iov = (struct iovec *)vec;
633 msg->msg_iovlen = num;
634 result = sock_sendmsg(sock, msg, size);
639 static inline int __sock_recvmsg(struct kiocb *iocb, struct socket *sock,
640 struct msghdr *msg, size_t size, int flags)
643 struct sock_iocb *si = kiocb_to_siocb(iocb);
651 err = security_socket_recvmsg(sock, msg, size, flags);
655 return sock->ops->recvmsg(iocb, sock, msg, size, flags);
658 int sock_recvmsg(struct socket *sock, struct msghdr *msg,
659 size_t size, int flags)
662 struct sock_iocb siocb;
665 init_sync_kiocb(&iocb, NULL);
666 iocb.private = &siocb;
667 ret = __sock_recvmsg(&iocb, sock, msg, size, flags);
668 if (-EIOCBQUEUED == ret)
669 ret = wait_on_sync_kiocb(&iocb);
673 int kernel_recvmsg(struct socket *sock, struct msghdr *msg,
674 struct kvec *vec, size_t num, size_t size, int flags)
676 mm_segment_t oldfs = get_fs();
681 * the following is safe, since for compiler definitions of kvec and
682 * iovec are identical, yielding the same in-core layout and alignment
684 msg->msg_iov = (struct iovec *)vec, msg->msg_iovlen = num;
685 result = sock_recvmsg(sock, msg, size, flags);
690 static void sock_aio_dtor(struct kiocb *iocb)
692 kfree(iocb->private);
695 static ssize_t sock_sendpage(struct file *file, struct page *page,
696 int offset, size_t size, loff_t *ppos, int more)
701 sock = file->private_data;
703 flags = !(file->f_flags & O_NONBLOCK) ? 0 : MSG_DONTWAIT;
707 return sock->ops->sendpage(sock, page, offset, size, flags);
710 static struct sock_iocb *alloc_sock_iocb(struct kiocb *iocb,
711 char __user *ubuf, size_t size,
712 struct sock_iocb *siocb)
714 if (!is_sync_kiocb(iocb)) {
715 siocb = kmalloc(sizeof(*siocb), GFP_KERNEL);
718 iocb->ki_dtor = sock_aio_dtor;
722 siocb->async_iov.iov_base = ubuf;
723 siocb->async_iov.iov_len = size;
725 iocb->private = siocb;
729 static ssize_t do_sock_read(struct msghdr *msg, struct kiocb *iocb,
730 struct file *file, struct iovec *iov,
731 unsigned long nr_segs)
733 struct socket *sock = file->private_data;
737 for (i = 0; i < nr_segs; i++)
738 size += iov[i].iov_len;
740 msg->msg_name = NULL;
741 msg->msg_namelen = 0;
742 msg->msg_control = NULL;
743 msg->msg_controllen = 0;
744 msg->msg_iov = (struct iovec *)iov;
745 msg->msg_iovlen = nr_segs;
746 msg->msg_flags = (file->f_flags & O_NONBLOCK) ? MSG_DONTWAIT : 0;
748 return __sock_recvmsg(iocb, sock, msg, size, msg->msg_flags);
751 static ssize_t sock_readv(struct file *file, const struct iovec *iov,
752 unsigned long nr_segs, loff_t *ppos)
755 struct sock_iocb siocb;
759 init_sync_kiocb(&iocb, NULL);
760 iocb.private = &siocb;
762 ret = do_sock_read(&msg, &iocb, file, (struct iovec *)iov, nr_segs);
763 if (-EIOCBQUEUED == ret)
764 ret = wait_on_sync_kiocb(&iocb);
768 static ssize_t sock_aio_read(struct kiocb *iocb, char __user *ubuf,
769 size_t count, loff_t pos)
771 struct sock_iocb siocb, *x;
775 if (count == 0) /* Match SYS5 behaviour */
778 x = alloc_sock_iocb(iocb, ubuf, count, &siocb);
781 return do_sock_read(&x->async_msg, iocb, iocb->ki_filp,
785 static ssize_t do_sock_write(struct msghdr *msg, struct kiocb *iocb,
786 struct file *file, struct iovec *iov,
787 unsigned long nr_segs)
789 struct socket *sock = file->private_data;
793 for (i = 0; i < nr_segs; i++)
794 size += iov[i].iov_len;
796 msg->msg_name = NULL;
797 msg->msg_namelen = 0;
798 msg->msg_control = NULL;
799 msg->msg_controllen = 0;
800 msg->msg_iov = (struct iovec *)iov;
801 msg->msg_iovlen = nr_segs;
802 msg->msg_flags = (file->f_flags & O_NONBLOCK) ? MSG_DONTWAIT : 0;
803 if (sock->type == SOCK_SEQPACKET)
804 msg->msg_flags |= MSG_EOR;
806 return __sock_sendmsg(iocb, sock, msg, size);
809 static ssize_t sock_writev(struct file *file, const struct iovec *iov,
810 unsigned long nr_segs, loff_t *ppos)
814 struct sock_iocb siocb;
817 init_sync_kiocb(&iocb, NULL);
818 iocb.private = &siocb;
820 ret = do_sock_write(&msg, &iocb, file, (struct iovec *)iov, nr_segs);
821 if (-EIOCBQUEUED == ret)
822 ret = wait_on_sync_kiocb(&iocb);
826 static ssize_t sock_aio_write(struct kiocb *iocb, const char __user *ubuf,
827 size_t count, loff_t pos)
829 struct sock_iocb siocb, *x;
833 if (count == 0) /* Match SYS5 behaviour */
836 x = alloc_sock_iocb(iocb, (void __user *)ubuf, count, &siocb);
840 return do_sock_write(&x->async_msg, iocb, iocb->ki_filp,
845 * Atomic setting of ioctl hooks to avoid race
846 * with module unload.
849 static DEFINE_MUTEX(br_ioctl_mutex);
850 static int (*br_ioctl_hook) (unsigned int cmd, void __user *arg) = NULL;
852 void brioctl_set(int (*hook) (unsigned int, void __user *))
854 mutex_lock(&br_ioctl_mutex);
855 br_ioctl_hook = hook;
856 mutex_unlock(&br_ioctl_mutex);
859 EXPORT_SYMBOL(brioctl_set);
861 static DEFINE_MUTEX(vlan_ioctl_mutex);
862 static int (*vlan_ioctl_hook) (void __user *arg);
864 void vlan_ioctl_set(int (*hook) (void __user *))
866 mutex_lock(&vlan_ioctl_mutex);
867 vlan_ioctl_hook = hook;
868 mutex_unlock(&vlan_ioctl_mutex);
871 EXPORT_SYMBOL(vlan_ioctl_set);
873 static DEFINE_MUTEX(dlci_ioctl_mutex);
874 static int (*dlci_ioctl_hook) (unsigned int, void __user *);
876 void dlci_ioctl_set(int (*hook) (unsigned int, void __user *))
878 mutex_lock(&dlci_ioctl_mutex);
879 dlci_ioctl_hook = hook;
880 mutex_unlock(&dlci_ioctl_mutex);
883 EXPORT_SYMBOL(dlci_ioctl_set);
886 * With an ioctl, arg may well be a user mode pointer, but we don't know
887 * what to do with it - that's up to the protocol still.
890 static long sock_ioctl(struct file *file, unsigned cmd, unsigned long arg)
893 void __user *argp = (void __user *)arg;
896 sock = file->private_data;
897 if (cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15)) {
898 err = dev_ioctl(cmd, argp);
900 #ifdef CONFIG_WIRELESS_EXT
901 if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) {
902 err = dev_ioctl(cmd, argp);
904 #endif /* CONFIG_WIRELESS_EXT */
909 if (get_user(pid, (int __user *)argp))
911 err = f_setown(sock->file, pid, 1);
915 err = put_user(sock->file->f_owner.pid,
924 request_module("bridge");
926 mutex_lock(&br_ioctl_mutex);
928 err = br_ioctl_hook(cmd, argp);
929 mutex_unlock(&br_ioctl_mutex);
934 if (!vlan_ioctl_hook)
935 request_module("8021q");
937 mutex_lock(&vlan_ioctl_mutex);
939 err = vlan_ioctl_hook(argp);
940 mutex_unlock(&vlan_ioctl_mutex);
944 /* Convert this to call through a hook */
945 err = divert_ioctl(cmd, argp);
950 if (!dlci_ioctl_hook)
951 request_module("dlci");
953 if (dlci_ioctl_hook) {
954 mutex_lock(&dlci_ioctl_mutex);
955 err = dlci_ioctl_hook(cmd, argp);
956 mutex_unlock(&dlci_ioctl_mutex);
960 err = sock->ops->ioctl(sock, cmd, arg);
963 * If this ioctl is unknown try to hand it down
966 if (err == -ENOIOCTLCMD)
967 err = dev_ioctl(cmd, argp);
973 int sock_create_lite(int family, int type, int protocol, struct socket **res)
976 struct socket *sock = NULL;
978 err = security_socket_create(family, type, protocol, 1);
989 err = security_socket_post_create(sock, family, type, protocol, 1);
1002 /* No kernel lock held - perfect */
1003 static unsigned int sock_poll(struct file *file, poll_table *wait)
1005 struct socket *sock;
1008 * We can't return errors to poll, so it's either yes or no.
1010 sock = file->private_data;
1011 return sock->ops->poll(file, sock, wait);
1014 static int sock_mmap(struct file *file, struct vm_area_struct *vma)
1016 struct socket *sock = file->private_data;
1018 return sock->ops->mmap(file, sock, vma);
1021 static int sock_close(struct inode *inode, struct file *filp)
1024 * It was possible the inode is NULL we were
1025 * closing an unfinished socket.
1029 printk(KERN_DEBUG "sock_close: NULL inode\n");
1032 sock_fasync(-1, filp, 0);
1033 sock_release(SOCKET_I(inode));
1038 * Update the socket async list
1040 * Fasync_list locking strategy.
1042 * 1. fasync_list is modified only under process context socket lock
1043 * i.e. under semaphore.
1044 * 2. fasync_list is used under read_lock(&sk->sk_callback_lock)
1045 * or under socket lock.
1046 * 3. fasync_list can be used from softirq context, so that
1047 * modification under socket lock have to be enhanced with
1048 * write_lock_bh(&sk->sk_callback_lock).
1052 static int sock_fasync(int fd, struct file *filp, int on)
1054 struct fasync_struct *fa, *fna = NULL, **prev;
1055 struct socket *sock;
1059 fna = kmalloc(sizeof(struct fasync_struct), GFP_KERNEL);
1064 sock = filp->private_data;
1074 prev = &(sock->fasync_list);
1076 for (fa = *prev; fa != NULL; prev = &fa->fa_next, fa = *prev)
1077 if (fa->fa_file == filp)
1082 write_lock_bh(&sk->sk_callback_lock);
1084 write_unlock_bh(&sk->sk_callback_lock);
1089 fna->fa_file = filp;
1091 fna->magic = FASYNC_MAGIC;
1092 fna->fa_next = sock->fasync_list;
1093 write_lock_bh(&sk->sk_callback_lock);
1094 sock->fasync_list = fna;
1095 write_unlock_bh(&sk->sk_callback_lock);
1098 write_lock_bh(&sk->sk_callback_lock);
1099 *prev = fa->fa_next;
1100 write_unlock_bh(&sk->sk_callback_lock);
1106 release_sock(sock->sk);
1110 /* This function may be called only under socket lock or callback_lock */
1112 int sock_wake_async(struct socket *sock, int how, int band)
1114 if (!sock || !sock->fasync_list)
1119 if (test_bit(SOCK_ASYNC_WAITDATA, &sock->flags))
1123 if (!test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags))
1128 __kill_fasync(sock->fasync_list, SIGIO, band);
1131 __kill_fasync(sock->fasync_list, SIGURG, band);
1136 static int __sock_create(int family, int type, int protocol,
1137 struct socket **res, int kern)
1140 struct socket *sock;
1143 * Check protocol is in range
1145 if (family < 0 || family >= NPROTO)
1146 return -EAFNOSUPPORT;
1147 if (type < 0 || type >= SOCK_MAX)
1152 This uglymoron is moved from INET layer to here to avoid
1153 deadlock in module load.
1155 if (family == PF_INET && type == SOCK_PACKET) {
1159 printk(KERN_INFO "%s uses obsolete (PF_INET,SOCK_PACKET)\n",
1165 err = security_socket_create(family, type, protocol, kern);
1169 #if defined(CONFIG_KMOD)
1170 /* Attempt to load a protocol module if the find failed.
1172 * 12/09/1996 Marcin: But! this makes REALLY only sense, if the user
1173 * requested real, full-featured networking support upon configuration.
1174 * Otherwise module support will break!
1176 if (net_families[family] == NULL) {
1177 request_module("net-pf-%d", family);
1181 net_family_read_lock();
1182 if (net_families[family] == NULL) {
1183 err = -EAFNOSUPPORT;
1188 * Allocate the socket and allow the family to set things up. if
1189 * the protocol is 0, the family is instructed to select an appropriate
1193 if (!(sock = sock_alloc())) {
1194 if (net_ratelimit())
1195 printk(KERN_WARNING "socket: no more sockets\n");
1196 err = -ENFILE; /* Not exactly a match, but its the
1197 closest posix thing */
1204 * We will call the ->create function, that possibly is in a loadable
1205 * module, so we have to bump that loadable module refcnt first.
1207 err = -EAFNOSUPPORT;
1208 if (!try_module_get(net_families[family]->owner))
1211 if ((err = net_families[family]->create(sock, protocol)) < 0) {
1213 goto out_module_put;
1217 * Now to bump the refcnt of the [loadable] module that owns this
1218 * socket at sock_release time we decrement its refcnt.
1220 if (!try_module_get(sock->ops->owner)) {
1222 goto out_module_put;
1225 * Now that we're done with the ->create function, the [loadable]
1226 * module can have its refcnt decremented
1228 module_put(net_families[family]->owner);
1230 err = security_socket_post_create(sock, family, type, protocol, kern);
1235 net_family_read_unlock();
1238 module_put(net_families[family]->owner);
1244 int sock_create(int family, int type, int protocol, struct socket **res)
1246 return __sock_create(family, type, protocol, res, 0);
1249 int sock_create_kern(int family, int type, int protocol, struct socket **res)
1251 return __sock_create(family, type, protocol, res, 1);
1254 asmlinkage long sys_socket(int family, int type, int protocol)
1257 struct socket *sock;
1259 retval = sock_create(family, type, protocol, &sock);
1263 retval = sock_map_fd(sock);
1268 /* It may be already another descriptor 8) Not kernel problem. */
1277 * Create a pair of connected sockets.
1280 asmlinkage long sys_socketpair(int family, int type, int protocol,
1281 int __user *usockvec)
1283 struct socket *sock1, *sock2;
1287 * Obtain the first socket and check if the underlying protocol
1288 * supports the socketpair call.
1291 err = sock_create(family, type, protocol, &sock1);
1295 err = sock_create(family, type, protocol, &sock2);
1299 err = sock1->ops->socketpair(sock1, sock2);
1301 goto out_release_both;
1305 err = sock_map_fd(sock1);
1307 goto out_release_both;
1310 err = sock_map_fd(sock2);
1315 /* fd1 and fd2 may be already another descriptors.
1316 * Not kernel problem.
1319 err = put_user(fd1, &usockvec[0]);
1321 err = put_user(fd2, &usockvec[1]);
1330 sock_release(sock2);
1335 sock_release(sock2);
1337 sock_release(sock1);
1343 * Bind a name to a socket. Nothing much to do here since it's
1344 * the protocol's responsibility to handle the local address.
1346 * We move the socket address to kernel space before we call
1347 * the protocol layer (having also checked the address is ok).
1350 asmlinkage long sys_bind(int fd, struct sockaddr __user *umyaddr, int addrlen)
1352 struct socket *sock;
1353 char address[MAX_SOCK_ADDR];
1354 int err, fput_needed;
1356 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1358 err = move_addr_to_kernel(umyaddr, addrlen, address);
1360 err = security_socket_bind(sock,
1361 (struct sockaddr *)address,
1364 err = sock->ops->bind(sock,
1368 fput_light(sock->file, fput_needed);
1374 * Perform a listen. Basically, we allow the protocol to do anything
1375 * necessary for a listen, and if that works, we mark the socket as
1376 * ready for listening.
1379 int sysctl_somaxconn = SOMAXCONN;
1381 asmlinkage long sys_listen(int fd, int backlog)
1383 struct socket *sock;
1384 int err, fput_needed;
1386 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1388 if ((unsigned)backlog > sysctl_somaxconn)
1389 backlog = sysctl_somaxconn;
1391 err = security_socket_listen(sock, backlog);
1393 err = sock->ops->listen(sock, backlog);
1395 fput_light(sock->file, fput_needed);
1401 * For accept, we attempt to create a new socket, set up the link
1402 * with the client, wake up the client, then return the new
1403 * connected fd. We collect the address of the connector in kernel
1404 * space and move it to user at the very end. This is unclean because
1405 * we open the socket then return an error.
1407 * 1003.1g adds the ability to recvmsg() to query connection pending
1408 * status to recvmsg. We need to add that support in a way thats
1409 * clean when we restucture accept also.
1412 asmlinkage long sys_accept(int fd, struct sockaddr __user *upeer_sockaddr,
1413 int __user *upeer_addrlen)
1415 struct socket *sock, *newsock;
1416 struct file *newfile;
1417 int err, len, newfd, fput_needed;
1418 char address[MAX_SOCK_ADDR];
1420 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1425 if (!(newsock = sock_alloc()))
1428 newsock->type = sock->type;
1429 newsock->ops = sock->ops;
1432 * We don't need try_module_get here, as the listening socket (sock)
1433 * has the protocol module (sock->ops->owner) held.
1435 __module_get(newsock->ops->owner);
1437 newfd = sock_alloc_fd(&newfile);
1438 if (unlikely(newfd < 0)) {
1440 sock_release(newsock);
1444 err = sock_attach_fd(newsock, newfile);
1448 err = security_socket_accept(sock, newsock);
1452 err = sock->ops->accept(sock, newsock, sock->file->f_flags);
1456 if (upeer_sockaddr) {
1457 if (newsock->ops->getname(newsock, (struct sockaddr *)address,
1459 err = -ECONNABORTED;
1462 err = move_addr_to_user(address, len, upeer_sockaddr,
1468 /* File flags are not inherited via accept() unlike another OSes. */
1470 fd_install(newfd, newfile);
1473 security_socket_post_accept(sock, newsock);
1476 fput_light(sock->file, fput_needed);
1481 put_unused_fd(newfd);
1486 * Attempt to connect to a socket with the server address. The address
1487 * is in user space so we verify it is OK and move it to kernel space.
1489 * For 1003.1g we need to add clean support for a bind to AF_UNSPEC to
1492 * NOTE: 1003.1g draft 6.3 is broken with respect to AX.25/NetROM and
1493 * other SEQPACKET protocols that take time to connect() as it doesn't
1494 * include the -EINPROGRESS status for such sockets.
1497 asmlinkage long sys_connect(int fd, struct sockaddr __user *uservaddr,
1500 struct socket *sock;
1501 char address[MAX_SOCK_ADDR];
1502 int err, fput_needed;
1504 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1507 err = move_addr_to_kernel(uservaddr, addrlen, address);
1512 security_socket_connect(sock, (struct sockaddr *)address, addrlen);
1516 err = sock->ops->connect(sock, (struct sockaddr *)address, addrlen,
1517 sock->file->f_flags);
1519 fput_light(sock->file, fput_needed);
1525 * Get the local address ('name') of a socket object. Move the obtained
1526 * name to user space.
1529 asmlinkage long sys_getsockname(int fd, struct sockaddr __user *usockaddr,
1530 int __user *usockaddr_len)
1532 struct socket *sock;
1533 char address[MAX_SOCK_ADDR];
1534 int len, err, fput_needed;
1536 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1540 err = security_socket_getsockname(sock);
1544 err = sock->ops->getname(sock, (struct sockaddr *)address, &len, 0);
1547 err = move_addr_to_user(address, len, usockaddr, usockaddr_len);
1550 fput_light(sock->file, fput_needed);
1556 * Get the remote address ('name') of a socket object. Move the obtained
1557 * name to user space.
1560 asmlinkage long sys_getpeername(int fd, struct sockaddr __user *usockaddr,
1561 int __user *usockaddr_len)
1563 struct socket *sock;
1564 char address[MAX_SOCK_ADDR];
1565 int len, err, fput_needed;
1567 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1569 err = security_socket_getpeername(sock);
1571 fput_light(sock->file, fput_needed);
1576 sock->ops->getname(sock, (struct sockaddr *)address, &len,
1579 err = move_addr_to_user(address, len, usockaddr,
1581 fput_light(sock->file, fput_needed);
1587 * Send a datagram to a given address. We move the address into kernel
1588 * space and check the user space data area is readable before invoking
1592 asmlinkage long sys_sendto(int fd, void __user *buff, size_t len,
1593 unsigned flags, struct sockaddr __user *addr,
1596 struct socket *sock;
1597 char address[MAX_SOCK_ADDR];
1602 struct file *sock_file;
1604 sock_file = fget_light(fd, &fput_needed);
1608 sock = sock_from_file(sock_file, &err);
1611 iov.iov_base = buff;
1613 msg.msg_name = NULL;
1616 msg.msg_control = NULL;
1617 msg.msg_controllen = 0;
1618 msg.msg_namelen = 0;
1620 err = move_addr_to_kernel(addr, addr_len, address);
1623 msg.msg_name = address;
1624 msg.msg_namelen = addr_len;
1626 if (sock->file->f_flags & O_NONBLOCK)
1627 flags |= MSG_DONTWAIT;
1628 msg.msg_flags = flags;
1629 err = sock_sendmsg(sock, &msg, len);
1632 fput_light(sock_file, fput_needed);
1637 * Send a datagram down a socket.
1640 asmlinkage long sys_send(int fd, void __user *buff, size_t len, unsigned flags)
1642 return sys_sendto(fd, buff, len, flags, NULL, 0);
1646 * Receive a frame from the socket and optionally record the address of the
1647 * sender. We verify the buffers are writable and if needed move the
1648 * sender address from kernel to user space.
1651 asmlinkage long sys_recvfrom(int fd, void __user *ubuf, size_t size,
1652 unsigned flags, struct sockaddr __user *addr,
1653 int __user *addr_len)
1655 struct socket *sock;
1658 char address[MAX_SOCK_ADDR];
1660 struct file *sock_file;
1663 sock_file = fget_light(fd, &fput_needed);
1667 sock = sock_from_file(sock_file, &err);
1671 msg.msg_control = NULL;
1672 msg.msg_controllen = 0;
1676 iov.iov_base = ubuf;
1677 msg.msg_name = address;
1678 msg.msg_namelen = MAX_SOCK_ADDR;
1679 if (sock->file->f_flags & O_NONBLOCK)
1680 flags |= MSG_DONTWAIT;
1681 err = sock_recvmsg(sock, &msg, size, flags);
1683 if (err >= 0 && addr != NULL) {
1684 err2 = move_addr_to_user(address, msg.msg_namelen, addr, addr_len);
1689 fput_light(sock_file, fput_needed);
1694 * Receive a datagram from a socket.
1697 asmlinkage long sys_recv(int fd, void __user *ubuf, size_t size,
1700 return sys_recvfrom(fd, ubuf, size, flags, NULL, NULL);
1704 * Set a socket option. Because we don't know the option lengths we have
1705 * to pass the user mode parameter for the protocols to sort out.
1708 asmlinkage long sys_setsockopt(int fd, int level, int optname,
1709 char __user *optval, int optlen)
1711 int err, fput_needed;
1712 struct socket *sock;
1717 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1719 err = security_socket_setsockopt(sock, level, optname);
1723 if (level == SOL_SOCKET)
1725 sock_setsockopt(sock, level, optname, optval,
1729 sock->ops->setsockopt(sock, level, optname, optval,
1732 fput_light(sock->file, fput_needed);
1738 * Get a socket option. Because we don't know the option lengths we have
1739 * to pass a user mode parameter for the protocols to sort out.
1742 asmlinkage long sys_getsockopt(int fd, int level, int optname,
1743 char __user *optval, int __user *optlen)
1745 int err, fput_needed;
1746 struct socket *sock;
1748 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1750 err = security_socket_getsockopt(sock, level, optname);
1754 if (level == SOL_SOCKET)
1756 sock_getsockopt(sock, level, optname, optval,
1760 sock->ops->getsockopt(sock, level, optname, optval,
1763 fput_light(sock->file, fput_needed);
1769 * Shutdown a socket.
1772 asmlinkage long sys_shutdown(int fd, int how)
1774 int err, fput_needed;
1775 struct socket *sock;
1777 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1779 err = security_socket_shutdown(sock, how);
1781 err = sock->ops->shutdown(sock, how);
1782 fput_light(sock->file, fput_needed);
1787 /* A couple of helpful macros for getting the address of the 32/64 bit
1788 * fields which are the same type (int / unsigned) on our platforms.
1790 #define COMPAT_MSG(msg, member) ((MSG_CMSG_COMPAT & flags) ? &msg##_compat->member : &msg->member)
1791 #define COMPAT_NAMELEN(msg) COMPAT_MSG(msg, msg_namelen)
1792 #define COMPAT_FLAGS(msg) COMPAT_MSG(msg, msg_flags)
1795 * BSD sendmsg interface
1798 asmlinkage long sys_sendmsg(int fd, struct msghdr __user *msg, unsigned flags)
1800 struct compat_msghdr __user *msg_compat =
1801 (struct compat_msghdr __user *)msg;
1802 struct socket *sock;
1803 char address[MAX_SOCK_ADDR];
1804 struct iovec iovstack[UIO_FASTIOV], *iov = iovstack;
1805 unsigned char ctl[sizeof(struct cmsghdr) + 20]
1806 __attribute__ ((aligned(sizeof(__kernel_size_t))));
1807 /* 20 is size of ipv6_pktinfo */
1808 unsigned char *ctl_buf = ctl;
1809 struct msghdr msg_sys;
1810 int err, ctl_len, iov_size, total_len;
1814 if (MSG_CMSG_COMPAT & flags) {
1815 if (get_compat_msghdr(&msg_sys, msg_compat))
1818 else if (copy_from_user(&msg_sys, msg, sizeof(struct msghdr)))
1821 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1825 /* do not move before msg_sys is valid */
1827 if (msg_sys.msg_iovlen > UIO_MAXIOV)
1830 /* Check whether to allocate the iovec area */
1832 iov_size = msg_sys.msg_iovlen * sizeof(struct iovec);
1833 if (msg_sys.msg_iovlen > UIO_FASTIOV) {
1834 iov = sock_kmalloc(sock->sk, iov_size, GFP_KERNEL);
1839 /* This will also move the address data into kernel space */
1840 if (MSG_CMSG_COMPAT & flags) {
1841 err = verify_compat_iovec(&msg_sys, iov, address, VERIFY_READ);
1843 err = verify_iovec(&msg_sys, iov, address, VERIFY_READ);
1850 if (msg_sys.msg_controllen > INT_MAX)
1852 ctl_len = msg_sys.msg_controllen;
1853 if ((MSG_CMSG_COMPAT & flags) && ctl_len) {
1855 cmsghdr_from_user_compat_to_kern(&msg_sys, sock->sk, ctl,
1859 ctl_buf = msg_sys.msg_control;
1860 ctl_len = msg_sys.msg_controllen;
1861 } else if (ctl_len) {
1862 if (ctl_len > sizeof(ctl)) {
1863 ctl_buf = sock_kmalloc(sock->sk, ctl_len, GFP_KERNEL);
1864 if (ctl_buf == NULL)
1869 * Careful! Before this, msg_sys.msg_control contains a user pointer.
1870 * Afterwards, it will be a kernel pointer. Thus the compiler-assisted
1871 * checking falls down on this.
1873 if (copy_from_user(ctl_buf, (void __user *)msg_sys.msg_control,
1876 msg_sys.msg_control = ctl_buf;
1878 msg_sys.msg_flags = flags;
1880 if (sock->file->f_flags & O_NONBLOCK)
1881 msg_sys.msg_flags |= MSG_DONTWAIT;
1882 err = sock_sendmsg(sock, &msg_sys, total_len);
1886 sock_kfree_s(sock->sk, ctl_buf, ctl_len);
1888 if (iov != iovstack)
1889 sock_kfree_s(sock->sk, iov, iov_size);
1891 fput_light(sock->file, fput_needed);
1897 * BSD recvmsg interface
1900 asmlinkage long sys_recvmsg(int fd, struct msghdr __user *msg,
1903 struct compat_msghdr __user *msg_compat =
1904 (struct compat_msghdr __user *)msg;
1905 struct socket *sock;
1906 struct iovec iovstack[UIO_FASTIOV];
1907 struct iovec *iov = iovstack;
1908 struct msghdr msg_sys;
1909 unsigned long cmsg_ptr;
1910 int err, iov_size, total_len, len;
1913 /* kernel mode address */
1914 char addr[MAX_SOCK_ADDR];
1916 /* user mode address pointers */
1917 struct sockaddr __user *uaddr;
1918 int __user *uaddr_len;
1920 if (MSG_CMSG_COMPAT & flags) {
1921 if (get_compat_msghdr(&msg_sys, msg_compat))
1924 else if (copy_from_user(&msg_sys, msg, sizeof(struct msghdr)))
1927 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1932 if (msg_sys.msg_iovlen > UIO_MAXIOV)
1935 /* Check whether to allocate the iovec area */
1937 iov_size = msg_sys.msg_iovlen * sizeof(struct iovec);
1938 if (msg_sys.msg_iovlen > UIO_FASTIOV) {
1939 iov = sock_kmalloc(sock->sk, iov_size, GFP_KERNEL);
1945 * Save the user-mode address (verify_iovec will change the
1946 * kernel msghdr to use the kernel address space)
1949 uaddr = (void __user *)msg_sys.msg_name;
1950 uaddr_len = COMPAT_NAMELEN(msg);
1951 if (MSG_CMSG_COMPAT & flags) {
1952 err = verify_compat_iovec(&msg_sys, iov, addr, VERIFY_WRITE);
1954 err = verify_iovec(&msg_sys, iov, addr, VERIFY_WRITE);
1959 cmsg_ptr = (unsigned long)msg_sys.msg_control;
1960 msg_sys.msg_flags = 0;
1961 if (MSG_CMSG_COMPAT & flags)
1962 msg_sys.msg_flags = MSG_CMSG_COMPAT;
1964 if (sock->file->f_flags & O_NONBLOCK)
1965 flags |= MSG_DONTWAIT;
1966 err = sock_recvmsg(sock, &msg_sys, total_len, flags);
1971 if (uaddr != NULL) {
1972 err = move_addr_to_user(addr, msg_sys.msg_namelen, uaddr,
1977 err = __put_user((msg_sys.msg_flags & ~MSG_CMSG_COMPAT),
1981 if (MSG_CMSG_COMPAT & flags)
1982 err = __put_user((unsigned long)msg_sys.msg_control - cmsg_ptr,
1983 &msg_compat->msg_controllen);
1985 err = __put_user((unsigned long)msg_sys.msg_control - cmsg_ptr,
1986 &msg->msg_controllen);
1992 if (iov != iovstack)
1993 sock_kfree_s(sock->sk, iov, iov_size);
1995 fput_light(sock->file, fput_needed);
2000 #ifdef __ARCH_WANT_SYS_SOCKETCALL
2002 /* Argument list sizes for sys_socketcall */
2003 #define AL(x) ((x) * sizeof(unsigned long))
2004 static const unsigned char nargs[18]={
2005 AL(0),AL(3),AL(3),AL(3),AL(2),AL(3),
2006 AL(3),AL(3),AL(4),AL(4),AL(4),AL(6),
2007 AL(6),AL(2),AL(5),AL(5),AL(3),AL(3)
2013 * System call vectors.
2015 * Argument checking cleaned up. Saved 20% in size.
2016 * This function doesn't need to set the kernel lock because
2017 * it is set by the callees.
2020 asmlinkage long sys_socketcall(int call, unsigned long __user *args)
2023 unsigned long a0, a1;
2026 if (call < 1 || call > SYS_RECVMSG)
2029 /* copy_from_user should be SMP safe. */
2030 if (copy_from_user(a, args, nargs[call]))
2033 err = audit_socketcall(nargs[call] / sizeof(unsigned long), a);
2042 err = sys_socket(a0, a1, a[2]);
2045 err = sys_bind(a0, (struct sockaddr __user *)a1, a[2]);
2048 err = sys_connect(a0, (struct sockaddr __user *)a1, a[2]);
2051 err = sys_listen(a0, a1);
2055 sys_accept(a0, (struct sockaddr __user *)a1,
2056 (int __user *)a[2]);
2058 case SYS_GETSOCKNAME:
2060 sys_getsockname(a0, (struct sockaddr __user *)a1,
2061 (int __user *)a[2]);
2063 case SYS_GETPEERNAME:
2065 sys_getpeername(a0, (struct sockaddr __user *)a1,
2066 (int __user *)a[2]);
2068 case SYS_SOCKETPAIR:
2069 err = sys_socketpair(a0, a1, a[2], (int __user *)a[3]);
2072 err = sys_send(a0, (void __user *)a1, a[2], a[3]);
2075 err = sys_sendto(a0, (void __user *)a1, a[2], a[3],
2076 (struct sockaddr __user *)a[4], a[5]);
2079 err = sys_recv(a0, (void __user *)a1, a[2], a[3]);
2082 err = sys_recvfrom(a0, (void __user *)a1, a[2], a[3],
2083 (struct sockaddr __user *)a[4],
2084 (int __user *)a[5]);
2087 err = sys_shutdown(a0, a1);
2089 case SYS_SETSOCKOPT:
2090 err = sys_setsockopt(a0, a1, a[2], (char __user *)a[3], a[4]);
2092 case SYS_GETSOCKOPT:
2094 sys_getsockopt(a0, a1, a[2], (char __user *)a[3],
2095 (int __user *)a[4]);
2098 err = sys_sendmsg(a0, (struct msghdr __user *)a1, a[2]);
2101 err = sys_recvmsg(a0, (struct msghdr __user *)a1, a[2]);
2110 #endif /* __ARCH_WANT_SYS_SOCKETCALL */
2113 * This function is called by a protocol handler that wants to
2114 * advertise its address family, and have it linked into the
2118 int sock_register(struct net_proto_family *ops)
2122 if (ops->family >= NPROTO) {
2123 printk(KERN_CRIT "protocol %d >= NPROTO(%d)\n", ops->family,
2127 net_family_write_lock();
2129 if (net_families[ops->family] == NULL) {
2130 net_families[ops->family] = ops;
2133 net_family_write_unlock();
2134 printk(KERN_INFO "NET: Registered protocol family %d\n", ops->family);
2139 * This function is called by a protocol handler that wants to
2140 * remove its address family, and have it unlinked from the
2144 int sock_unregister(int family)
2146 if (family < 0 || family >= NPROTO)
2149 net_family_write_lock();
2150 net_families[family] = NULL;
2151 net_family_write_unlock();
2152 printk(KERN_INFO "NET: Unregistered protocol family %d\n", family);
2156 static int __init sock_init(void)
2159 * Initialize sock SLAB cache.
2165 * Initialize skbuff SLAB cache
2170 * Initialize the protocols module.
2174 register_filesystem(&sock_fs_type);
2175 sock_mnt = kern_mount(&sock_fs_type);
2177 /* The real protocol initialization is performed in later initcalls.
2180 #ifdef CONFIG_NETFILTER
2187 core_initcall(sock_init); /* early initcall */
2189 #ifdef CONFIG_PROC_FS
2190 void socket_seq_show(struct seq_file *seq)
2195 for_each_possible_cpu(cpu)
2196 counter += per_cpu(sockets_in_use, cpu);
2198 /* It can be negative, by the way. 8) */
2202 seq_printf(seq, "sockets: used %d\n", counter);
2204 #endif /* CONFIG_PROC_FS */
2206 #ifdef CONFIG_COMPAT
2207 static long compat_sock_ioctl(struct file *file, unsigned cmd,
2210 struct socket *sock = file->private_data;
2211 int ret = -ENOIOCTLCMD;
2213 if (sock->ops->compat_ioctl)
2214 ret = sock->ops->compat_ioctl(sock, cmd, arg);
2220 int kernel_bind(struct socket *sock, struct sockaddr *addr, int addrlen)
2222 return sock->ops->bind(sock, addr, addrlen);
2225 int kernel_listen(struct socket *sock, int backlog)
2227 return sock->ops->listen(sock, backlog);
2230 int kernel_accept(struct socket *sock, struct socket **newsock, int flags)
2232 struct sock *sk = sock->sk;
2235 err = sock_create_lite(sk->sk_family, sk->sk_type, sk->sk_protocol,
2240 err = sock->ops->accept(sock, *newsock, flags);
2242 sock_release(*newsock);
2246 (*newsock)->ops = sock->ops;
2252 int kernel_connect(struct socket *sock, struct sockaddr *addr, int addrlen,
2255 return sock->ops->connect(sock, addr, addrlen, flags);
2258 int kernel_getsockname(struct socket *sock, struct sockaddr *addr,
2261 return sock->ops->getname(sock, addr, addrlen, 0);
2264 int kernel_getpeername(struct socket *sock, struct sockaddr *addr,
2267 return sock->ops->getname(sock, addr, addrlen, 1);
2270 int kernel_getsockopt(struct socket *sock, int level, int optname,
2271 char *optval, int *optlen)
2273 mm_segment_t oldfs = get_fs();
2277 if (level == SOL_SOCKET)
2278 err = sock_getsockopt(sock, level, optname, optval, optlen);
2280 err = sock->ops->getsockopt(sock, level, optname, optval,
2286 int kernel_setsockopt(struct socket *sock, int level, int optname,
2287 char *optval, int optlen)
2289 mm_segment_t oldfs = get_fs();
2293 if (level == SOL_SOCKET)
2294 err = sock_setsockopt(sock, level, optname, optval, optlen);
2296 err = sock->ops->setsockopt(sock, level, optname, optval,
2302 int kernel_sendpage(struct socket *sock, struct page *page, int offset,
2303 size_t size, int flags)
2305 if (sock->ops->sendpage)
2306 return sock->ops->sendpage(sock, page, offset, size, flags);
2308 return sock_no_sendpage(sock, page, offset, size, flags);
2311 int kernel_sock_ioctl(struct socket *sock, int cmd, unsigned long arg)
2313 mm_segment_t oldfs = get_fs();
2317 err = sock->ops->ioctl(sock, cmd, arg);
2323 /* ABI emulation layers need these two */
2324 EXPORT_SYMBOL(move_addr_to_kernel);
2325 EXPORT_SYMBOL(move_addr_to_user);
2326 EXPORT_SYMBOL(sock_create);
2327 EXPORT_SYMBOL(sock_create_kern);
2328 EXPORT_SYMBOL(sock_create_lite);
2329 EXPORT_SYMBOL(sock_map_fd);
2330 EXPORT_SYMBOL(sock_recvmsg);
2331 EXPORT_SYMBOL(sock_register);
2332 EXPORT_SYMBOL(sock_release);
2333 EXPORT_SYMBOL(sock_sendmsg);
2334 EXPORT_SYMBOL(sock_unregister);
2335 EXPORT_SYMBOL(sock_wake_async);
2336 EXPORT_SYMBOL(sockfd_lookup);
2337 EXPORT_SYMBOL(kernel_sendmsg);
2338 EXPORT_SYMBOL(kernel_recvmsg);
2339 EXPORT_SYMBOL(kernel_bind);
2340 EXPORT_SYMBOL(kernel_listen);
2341 EXPORT_SYMBOL(kernel_accept);
2342 EXPORT_SYMBOL(kernel_connect);
2343 EXPORT_SYMBOL(kernel_getsockname);
2344 EXPORT_SYMBOL(kernel_getpeername);
2345 EXPORT_SYMBOL(kernel_getsockopt);
2346 EXPORT_SYMBOL(kernel_setsockopt);
2347 EXPORT_SYMBOL(kernel_sendpage);
2348 EXPORT_SYMBOL(kernel_sock_ioctl);