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>
7 * Ross Biro, <bir7@leland.Stanford.Edu>
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
61 #include <linux/config.h>
63 #include <linux/smp_lock.h>
64 #include <linux/socket.h>
65 #include <linux/file.h>
66 #include <linux/net.h>
67 #include <linux/interrupt.h>
68 #include <linux/netdevice.h>
69 #include <linux/proc_fs.h>
70 #include <linux/seq_file.h>
72 #include <linux/wanrouter.h>
73 #include <linux/if_bridge.h>
74 #include <linux/init.h>
75 #include <linux/poll.h>
76 #include <linux/cache.h>
77 #include <linux/module.h>
78 #include <linux/highmem.h>
79 #include <linux/divert.h>
80 #include <linux/mount.h>
81 #include <linux/security.h>
82 #include <linux/syscalls.h>
83 #include <linux/compat.h>
84 #include <linux/kmod.h>
86 #ifdef CONFIG_NET_RADIO
87 #include <linux/wireless.h> /* Note : will define WIRELESS_EXT */
88 #endif /* CONFIG_NET_RADIO */
90 #include <asm/uaccess.h>
91 #include <asm/unistd.h>
93 #include <net/compat.h>
96 #include <linux/netfilter.h>
97 #include <linux/vs_base.h>
98 #include <linux/vs_socket.h>
100 static int sock_no_open(struct inode *irrelevant, struct file *dontcare);
101 static ssize_t sock_aio_read(struct kiocb *iocb, char __user *buf,
102 size_t size, loff_t pos);
103 static ssize_t sock_aio_write(struct kiocb *iocb, const char __user *buf,
104 size_t size, loff_t pos);
105 static int sock_mmap(struct file *file, struct vm_area_struct * vma);
107 static int sock_close(struct inode *inode, struct file *file);
108 static unsigned int sock_poll(struct file *file,
109 struct poll_table_struct *wait);
110 static int sock_ioctl(struct inode *inode, struct file *file,
111 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);
122 * Socket files have a set of 'special' operations as well as the generic file ones. These don't appear
123 * in the operation structures but are done directly via the socketcall() multiplexor.
126 struct file_operations socket_file_ops = {
127 .owner = THIS_MODULE,
129 .aio_read = sock_aio_read,
130 .aio_write = sock_aio_write,
134 .open = sock_no_open, /* special open code to disallow open via /proc */
135 .release = sock_close,
136 .fasync = sock_fasync,
138 .writev = sock_writev,
139 .sendpage = sock_sendpage
143 * The protocol list. Each protocol is registered in here.
146 static struct net_proto_family *net_families[NPROTO];
148 #if defined(CONFIG_SMP) || defined(CONFIG_PREEMPT)
149 static atomic_t net_family_lockct = ATOMIC_INIT(0);
150 static spinlock_t net_family_lock = SPIN_LOCK_UNLOCKED;
152 /* The strategy is: modifications net_family vector are short, do not
153 sleep and veeery rare, but read access should be free of any exclusive
157 static void net_family_write_lock(void)
159 spin_lock(&net_family_lock);
160 while (atomic_read(&net_family_lockct) != 0) {
161 spin_unlock(&net_family_lock);
165 spin_lock(&net_family_lock);
169 static __inline__ void net_family_write_unlock(void)
171 spin_unlock(&net_family_lock);
174 static __inline__ void net_family_read_lock(void)
176 atomic_inc(&net_family_lockct);
177 spin_unlock_wait(&net_family_lock);
180 static __inline__ void net_family_read_unlock(void)
182 atomic_dec(&net_family_lockct);
186 #define net_family_write_lock() do { } while(0)
187 #define net_family_write_unlock() do { } while(0)
188 #define net_family_read_lock() do { } while(0)
189 #define net_family_read_unlock() do { } while(0)
194 * Statistics counters of the socket lists
197 static DEFINE_PER_CPU(int, sockets_in_use) = 0;
200 * Support routines. Move socket addresses back and forth across the kernel/user
201 * divide and look after the messy bits.
204 #define MAX_SOCK_ADDR 128 /* 108 for Unix domain -
205 16 for IP, 16 for IPX,
208 must be at least one bigger than
209 the AF_UNIX size (see net/unix/af_unix.c
214 * move_addr_to_kernel - copy a socket address into kernel space
215 * @uaddr: Address in user space
216 * @kaddr: Address in kernel space
217 * @ulen: Length in user space
219 * The address is copied into kernel space. If the provided address is
220 * too long an error code of -EINVAL is returned. If the copy gives
221 * invalid addresses -EFAULT is returned. On a success 0 is returned.
224 int move_addr_to_kernel(void __user *uaddr, int ulen, void *kaddr)
226 if(ulen<0||ulen>MAX_SOCK_ADDR)
230 if(copy_from_user(kaddr,uaddr,ulen))
236 * move_addr_to_user - copy an address to user space
237 * @kaddr: kernel space address
238 * @klen: length of address in kernel
239 * @uaddr: user space address
240 * @ulen: pointer to user length field
242 * The value pointed to by ulen on entry is the buffer length available.
243 * This is overwritten with the buffer space used. -EINVAL is returned
244 * if an overlong buffer is specified or a negative buffer size. -EFAULT
245 * is returned if either the buffer or the length field are not
247 * After copying the data up to the limit the user specifies, the true
248 * length of the data is written over the length limit the user
249 * specified. Zero is returned for a success.
252 int move_addr_to_user(void *kaddr, int klen, void __user *uaddr, int __user *ulen)
257 if((err=get_user(len, ulen)))
261 if(len<0 || len> MAX_SOCK_ADDR)
265 if(copy_to_user(uaddr,kaddr,len))
269 * "fromlen shall refer to the value before truncation.."
272 return __put_user(klen, ulen);
275 #define SOCKFS_MAGIC 0x534F434B
277 static kmem_cache_t * sock_inode_cachep;
279 static struct inode *sock_alloc_inode(struct super_block *sb)
281 struct socket_alloc *ei;
282 ei = (struct socket_alloc *)kmem_cache_alloc(sock_inode_cachep, SLAB_KERNEL);
285 init_waitqueue_head(&ei->socket.wait);
287 ei->socket.fasync_list = NULL;
288 ei->socket.state = SS_UNCONNECTED;
289 ei->socket.flags = 0;
290 ei->socket.ops = NULL;
291 ei->socket.sk = NULL;
292 ei->socket.file = NULL;
293 ei->socket.flags = 0;
295 return &ei->vfs_inode;
298 static void sock_destroy_inode(struct inode *inode)
300 kmem_cache_free(sock_inode_cachep,
301 container_of(inode, struct socket_alloc, vfs_inode));
304 static void init_once(void * foo, kmem_cache_t * cachep, unsigned long flags)
306 struct socket_alloc *ei = (struct socket_alloc *) foo;
308 if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
309 SLAB_CTOR_CONSTRUCTOR)
310 inode_init_once(&ei->vfs_inode);
313 static int init_inodecache(void)
315 sock_inode_cachep = kmem_cache_create("sock_inode_cache",
316 sizeof(struct socket_alloc),
317 0, SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT,
319 if (sock_inode_cachep == NULL)
324 static struct super_operations sockfs_ops = {
325 .alloc_inode = sock_alloc_inode,
326 .destroy_inode =sock_destroy_inode,
327 .statfs = simple_statfs,
330 static struct super_block *sockfs_get_sb(struct file_system_type *fs_type,
331 int flags, const char *dev_name, void *data)
333 return get_sb_pseudo(fs_type, "socket:", &sockfs_ops, SOCKFS_MAGIC);
336 static struct vfsmount *sock_mnt;
338 static struct file_system_type sock_fs_type = {
340 .get_sb = sockfs_get_sb,
341 .kill_sb = kill_anon_super,
343 static int sockfs_delete_dentry(struct dentry *dentry)
347 static struct dentry_operations sockfs_dentry_operations = {
348 .d_delete = sockfs_delete_dentry,
352 * Obtains the first available file descriptor and sets it up for use.
354 * This function creates file structure and maps it to fd space
355 * of current process. On success it returns file descriptor
356 * and file struct implicitly stored in sock->file.
357 * Note that another thread may close file descriptor before we return
358 * from this function. We use the fact that now we do not refer
359 * to socket after mapping. If one day we will need it, this
360 * function will increment ref. count on file by 1.
362 * In any case returned fd MAY BE not valid!
363 * This race condition is unavoidable
364 * with shared fd spaces, we cannot solve it inside kernel,
365 * but we take care of internal coherence yet.
368 struct file * sock_map_file(struct socket *sock)
374 file = get_empty_filp();
377 return ERR_PTR(-ENFILE);
379 sprintf(name, "[%lu]", SOCK_INODE(sock)->i_ino);
381 this.len = strlen(name);
382 this.hash = SOCK_INODE(sock)->i_ino;
384 file->f_dentry = d_alloc(sock_mnt->mnt_sb->s_root, &this);
385 if (!file->f_dentry) {
387 return ERR_PTR(-ENOMEM);
389 file->f_dentry->d_op = &sockfs_dentry_operations;
390 d_add(file->f_dentry, SOCK_INODE(sock));
391 file->f_vfsmnt = mntget(sock_mnt);
392 file->f_mapping = file->f_dentry->d_inode->i_mapping;
397 file->f_op = SOCK_INODE(sock)->i_fop = &socket_file_ops;
399 file->f_flags = O_RDWR;
405 int sock_map_fd(struct socket *sock)
411 * Find a file descriptor suitable for return to the user.
414 fd = get_unused_fd();
418 file = sock_map_file(sock);
421 return PTR_ERR(file);
423 fd_install(fd, file);
429 * sockfd_lookup - Go from a file number to its socket slot
431 * @err: pointer to an error code return
433 * The file handle passed in is locked and the socket it is bound
434 * too is returned. If an error occurs the err pointer is overwritten
435 * with a negative errno code and NULL is returned. The function checks
436 * for both invalid handles and passing a handle which is not a socket.
438 * On a success the socket object pointer is returned.
441 struct socket *sockfd_lookup(int fd, int *err)
447 if (!(file = fget(fd)))
453 inode = file->f_dentry->d_inode;
454 if (!inode->i_sock || !(sock = SOCKET_I(inode)))
461 if (sock->file != file) {
462 printk(KERN_ERR "socki_lookup: socket file changed!\n");
469 * sock_alloc - allocate a socket
471 * Allocate a new inode and socket object. The two are bound together
472 * and initialised. The socket is then returned. If we are out of inodes
476 struct socket *sock_alloc(void)
478 struct inode * inode;
479 struct socket * sock;
481 inode = new_inode(sock_mnt->mnt_sb);
485 sock = SOCKET_I(inode);
487 inode->i_mode = S_IFSOCK|S_IRWXUGO;
489 inode->i_uid = current->fsuid;
490 inode->i_gid = current->fsgid;
492 get_cpu_var(sockets_in_use)++;
493 put_cpu_var(sockets_in_use);
498 * In theory you can't get an open on this inode, but /proc provides
499 * a back door. Remember to keep it shut otherwise you'll let the
500 * creepy crawlies in.
503 static int sock_no_open(struct inode *irrelevant, struct file *dontcare)
508 struct file_operations bad_sock_fops = {
509 .owner = THIS_MODULE,
510 .open = sock_no_open,
514 * sock_release - close a socket
515 * @sock: socket to close
517 * The socket is released from the protocol stack if it has a release
518 * callback, and the inode is then released if the socket is bound to
519 * an inode not a file.
522 void sock_release(struct socket *sock)
525 struct module *owner = sock->ops->owner;
527 sock->ops->release(sock);
532 if (sock->fasync_list)
533 printk(KERN_ERR "sock_release: fasync list not empty!\n");
535 get_cpu_var(sockets_in_use)--;
536 put_cpu_var(sockets_in_use);
538 iput(SOCK_INODE(sock));
544 static inline int __sock_sendmsg(struct kiocb *iocb, struct socket *sock,
545 struct msghdr *msg, size_t size)
547 struct sock_iocb *si = kiocb_to_siocb(iocb);
555 err = security_socket_sendmsg(sock, msg, size);
559 len = sock->ops->sendmsg(iocb, sock, msg, size);
562 vx_sock_send(sock->sk, size);
564 vx_sock_fail(sock->sk, size);
566 vxdprintk("__sock_sendmsg: %p[%p,%p,%p;%d]:%d/%d\n",
568 (sock->sk)?sock->sk->sk_nx_info:0,
569 (sock->sk)?sock->sk->sk_vx_info:0,
570 (sock->sk)?sock->sk->sk_xid:0,
575 int sock_sendmsg(struct socket *sock, struct msghdr *msg, size_t size)
580 init_sync_kiocb(&iocb, NULL);
581 ret = __sock_sendmsg(&iocb, sock, msg, size);
582 if (-EIOCBQUEUED == ret)
583 ret = wait_on_sync_kiocb(&iocb);
588 static inline int __sock_recvmsg(struct kiocb *iocb, struct socket *sock,
589 struct msghdr *msg, size_t size, int flags)
592 struct sock_iocb *si = kiocb_to_siocb(iocb);
600 err = security_socket_recvmsg(sock, msg, size, flags);
604 len = sock->ops->recvmsg(iocb, sock, msg, size, flags);
605 if ((len >= 0) && sock->sk)
606 vx_sock_recv(sock->sk, len);
607 vxdprintk("__sock_recvmsg: %p[%p,%p,%p;%d]:%d/%d\n",
609 (sock->sk)?sock->sk->sk_nx_info:0,
610 (sock->sk)?sock->sk->sk_vx_info:0,
611 (sock->sk)?sock->sk->sk_xid:0,
616 int sock_recvmsg(struct socket *sock, struct msghdr *msg,
617 size_t size, int flags)
622 init_sync_kiocb(&iocb, NULL);
623 ret = __sock_recvmsg(&iocb, sock, msg, size, flags);
624 if (-EIOCBQUEUED == ret)
625 ret = wait_on_sync_kiocb(&iocb);
630 * Read data from a socket. ubuf is a user mode pointer. We make sure the user
631 * area ubuf...ubuf+size-1 is writable before asking the protocol.
634 static ssize_t sock_aio_read(struct kiocb *iocb, char __user *ubuf,
635 size_t size, loff_t pos)
637 struct sock_iocb *x = kiocb_to_siocb(iocb);
643 if (size==0) /* Match SYS5 behaviour */
646 sock = SOCKET_I(iocb->ki_filp->f_dentry->d_inode);
648 x->async_msg.msg_name = NULL;
649 x->async_msg.msg_namelen = 0;
650 x->async_msg.msg_iov = &x->async_iov;
651 x->async_msg.msg_iovlen = 1;
652 x->async_msg.msg_control = NULL;
653 x->async_msg.msg_controllen = 0;
654 x->async_iov.iov_base = ubuf;
655 x->async_iov.iov_len = size;
656 flags = !(iocb->ki_filp->f_flags & O_NONBLOCK) ? 0 : MSG_DONTWAIT;
658 return __sock_recvmsg(iocb, sock, &x->async_msg, size, flags);
663 * Write data to a socket. We verify that the user area ubuf..ubuf+size-1
664 * is readable by the user process.
667 static ssize_t sock_aio_write(struct kiocb *iocb, const char __user *ubuf,
668 size_t size, loff_t pos)
670 struct sock_iocb *x = kiocb_to_siocb(iocb);
675 if(size==0) /* Match SYS5 behaviour */
678 sock = SOCKET_I(iocb->ki_filp->f_dentry->d_inode);
680 x->async_msg.msg_name = NULL;
681 x->async_msg.msg_namelen = 0;
682 x->async_msg.msg_iov = &x->async_iov;
683 x->async_msg.msg_iovlen = 1;
684 x->async_msg.msg_control = NULL;
685 x->async_msg.msg_controllen = 0;
686 x->async_msg.msg_flags = !(iocb->ki_filp->f_flags & O_NONBLOCK) ? 0 : MSG_DONTWAIT;
687 if (sock->type == SOCK_SEQPACKET)
688 x->async_msg.msg_flags |= MSG_EOR;
689 x->async_iov.iov_base = (void __user *)ubuf;
690 x->async_iov.iov_len = size;
692 return __sock_sendmsg(iocb, sock, &x->async_msg, size);
695 ssize_t sock_sendpage(struct file *file, struct page *page,
696 int offset, size_t size, loff_t *ppos, int more)
701 if (ppos != &file->f_pos)
704 sock = SOCKET_I(file->f_dentry->d_inode);
706 flags = !(file->f_flags & O_NONBLOCK) ? 0 : MSG_DONTWAIT;
710 return sock->ops->sendpage(sock, page, offset, size, flags);
713 int sock_readv_writev(int type, struct inode * inode, struct file * file,
714 const struct iovec * iov, long count, size_t size)
719 sock = SOCKET_I(inode);
723 msg.msg_control = NULL;
724 msg.msg_controllen = 0;
725 msg.msg_iov = (struct iovec *) iov;
726 msg.msg_iovlen = count;
727 msg.msg_flags = (file->f_flags & O_NONBLOCK) ? MSG_DONTWAIT : 0;
729 /* read() does a VERIFY_WRITE */
730 if (type == VERIFY_WRITE)
731 return sock_recvmsg(sock, &msg, size, msg.msg_flags);
733 if (sock->type == SOCK_SEQPACKET)
734 msg.msg_flags |= MSG_EOR;
736 return sock_sendmsg(sock, &msg, size);
739 static ssize_t sock_readv(struct file *file, const struct iovec *vector,
740 unsigned long count, loff_t *ppos)
744 for (i = 0 ; i < count ; i++)
745 tot_len += vector[i].iov_len;
746 return sock_readv_writev(VERIFY_WRITE, file->f_dentry->d_inode,
747 file, vector, count, tot_len);
750 static ssize_t sock_writev(struct file *file, const struct iovec *vector,
751 unsigned long count, loff_t *ppos)
755 for (i = 0 ; i < count ; i++)
756 tot_len += vector[i].iov_len;
757 return sock_readv_writev(VERIFY_READ, file->f_dentry->d_inode,
758 file, vector, count, tot_len);
763 * Atomic setting of ioctl hooks to avoid race
764 * with module unload.
767 static DECLARE_MUTEX(br_ioctl_mutex);
768 static int (*br_ioctl_hook)(unsigned int cmd, void __user *arg) = NULL;
770 void brioctl_set(int (*hook)(unsigned int, void __user *))
772 down(&br_ioctl_mutex);
773 br_ioctl_hook = hook;
776 EXPORT_SYMBOL(brioctl_set);
778 static DECLARE_MUTEX(vlan_ioctl_mutex);
779 static int (*vlan_ioctl_hook)(void __user *arg);
781 void vlan_ioctl_set(int (*hook)(void __user *))
783 down(&vlan_ioctl_mutex);
784 vlan_ioctl_hook = hook;
785 up(&vlan_ioctl_mutex);
787 EXPORT_SYMBOL(vlan_ioctl_set);
789 static DECLARE_MUTEX(dlci_ioctl_mutex);
790 static int (*dlci_ioctl_hook)(unsigned int, void __user *);
792 void dlci_ioctl_set(int (*hook)(unsigned int, void __user *))
794 down(&dlci_ioctl_mutex);
795 dlci_ioctl_hook = hook;
796 up(&dlci_ioctl_mutex);
798 EXPORT_SYMBOL(dlci_ioctl_set);
801 * With an ioctl, arg may well be a user mode pointer, but we don't know
802 * what to do with it - that's up to the protocol still.
805 static int sock_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
809 void __user *argp = (void __user *)arg;
813 sock = SOCKET_I(inode);
814 if (cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15)) {
815 err = dev_ioctl(cmd, argp);
818 if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) {
819 err = dev_ioctl(cmd, argp);
821 #endif /* WIRELESS_EXT */
826 if (get_user(pid, (int __user *)argp))
828 err = f_setown(sock->file, pid, 1);
832 err = put_user(sock->file->f_owner.pid, (int __user *)argp);
840 request_module("bridge");
842 down(&br_ioctl_mutex);
844 err = br_ioctl_hook(cmd, argp);
850 if (!vlan_ioctl_hook)
851 request_module("8021q");
853 down(&vlan_ioctl_mutex);
855 err = vlan_ioctl_hook(argp);
856 up(&vlan_ioctl_mutex);
860 /* Convert this to call through a hook */
861 err = divert_ioctl(cmd, argp);
866 if (!dlci_ioctl_hook)
867 request_module("dlci");
869 if (dlci_ioctl_hook) {
870 down(&dlci_ioctl_mutex);
871 err = dlci_ioctl_hook(cmd, argp);
872 up(&dlci_ioctl_mutex);
876 err = sock->ops->ioctl(sock, cmd, arg);
884 int sock_create_lite(int family, int type, int protocol, struct socket **res)
887 struct socket *sock = NULL;
889 err = security_socket_create(family, type, protocol, 1);
899 security_socket_post_create(sock, family, type, protocol, 1);
906 /* No kernel lock held - perfect */
907 static unsigned int sock_poll(struct file *file, poll_table * wait)
912 * We can't return errors to poll, so it's either yes or no.
914 sock = SOCKET_I(file->f_dentry->d_inode);
915 return sock->ops->poll(file, sock, wait);
918 static int sock_mmap(struct file * file, struct vm_area_struct * vma)
920 struct socket *sock = SOCKET_I(file->f_dentry->d_inode);
922 return sock->ops->mmap(file, sock, vma);
925 int sock_close(struct inode *inode, struct file *filp)
928 * It was possible the inode is NULL we were
929 * closing an unfinished socket.
934 printk(KERN_DEBUG "sock_close: NULL inode\n");
937 sock_fasync(-1, filp, 0);
938 sock_release(SOCKET_I(inode));
943 * Update the socket async list
945 * Fasync_list locking strategy.
947 * 1. fasync_list is modified only under process context socket lock
948 * i.e. under semaphore.
949 * 2. fasync_list is used under read_lock(&sk->sk_callback_lock)
950 * or under socket lock.
951 * 3. fasync_list can be used from softirq context, so that
952 * modification under socket lock have to be enhanced with
953 * write_lock_bh(&sk->sk_callback_lock).
957 static int sock_fasync(int fd, struct file *filp, int on)
959 struct fasync_struct *fa, *fna=NULL, **prev;
965 fna=(struct fasync_struct *)kmalloc(sizeof(struct fasync_struct), GFP_KERNEL);
970 sock = SOCKET_I(filp->f_dentry->d_inode);
972 if ((sk=sock->sk) == NULL) {
980 prev=&(sock->fasync_list);
982 for (fa=*prev; fa!=NULL; prev=&fa->fa_next,fa=*prev)
983 if (fa->fa_file==filp)
990 write_lock_bh(&sk->sk_callback_lock);
992 write_unlock_bh(&sk->sk_callback_lock);
999 fna->magic=FASYNC_MAGIC;
1000 fna->fa_next=sock->fasync_list;
1001 write_lock_bh(&sk->sk_callback_lock);
1002 sock->fasync_list=fna;
1003 write_unlock_bh(&sk->sk_callback_lock);
1009 write_lock_bh(&sk->sk_callback_lock);
1011 write_unlock_bh(&sk->sk_callback_lock);
1019 release_sock(sock->sk);
1023 /* This function may be called only under socket lock or callback_lock */
1025 int sock_wake_async(struct socket *sock, int how, int band)
1027 if (!sock || !sock->fasync_list)
1033 if (test_bit(SOCK_ASYNC_WAITDATA, &sock->flags))
1037 if (!test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags))
1042 __kill_fasync(sock->fasync_list, SIGIO, band);
1045 __kill_fasync(sock->fasync_list, SIGURG, band);
1050 static int __sock_create(int family, int type, int protocol, struct socket **res, int kern)
1054 struct socket *sock;
1057 * Check protocol is in range
1059 if (family < 0 || family >= NPROTO)
1060 return -EAFNOSUPPORT;
1061 if (type < 0 || type >= SOCK_MAX)
1064 /* disable IPv6 inside vservers for now */
1065 if (family == PF_INET6 && !vx_check(0, VX_ADMIN))
1066 return -EAFNOSUPPORT;
1070 This uglymoron is moved from INET layer to here to avoid
1071 deadlock in module load.
1073 if (family == PF_INET && type == SOCK_PACKET) {
1077 printk(KERN_INFO "%s uses obsolete (PF_INET,SOCK_PACKET)\n", current->comm);
1082 err = security_socket_create(family, type, protocol, kern);
1086 #if defined(CONFIG_KMOD)
1087 /* Attempt to load a protocol module if the find failed.
1089 * 12/09/1996 Marcin: But! this makes REALLY only sense, if the user
1090 * requested real, full-featured networking support upon configuration.
1091 * Otherwise module support will break!
1093 if (net_families[family]==NULL)
1095 request_module("net-pf-%d",family);
1099 net_family_read_lock();
1100 if (net_families[family] == NULL) {
1106 * Allocate the socket and allow the family to set things up. if
1107 * the protocol is 0, the family is instructed to select an appropriate
1111 if (!(sock = sock_alloc()))
1113 printk(KERN_WARNING "socket: no more sockets\n");
1114 i = -ENFILE; /* Not exactly a match, but its the
1115 closest posix thing */
1122 * We will call the ->create function, that possibly is in a loadable
1123 * module, so we have to bump that loadable module refcnt first.
1126 if (!try_module_get(net_families[family]->owner))
1129 if ((i = net_families[family]->create(sock, protocol)) < 0)
1130 goto out_module_put;
1132 * Now to bump the refcnt of the [loadable] module that owns this
1133 * socket at sock_release time we decrement its refcnt.
1135 if (!try_module_get(sock->ops->owner)) {
1137 goto out_module_put;
1140 * Now that we're done with the ->create function, the [loadable]
1141 * module can have its refcnt decremented
1143 module_put(net_families[family]->owner);
1145 security_socket_post_create(sock, family, type, protocol, kern);
1148 net_family_read_unlock();
1151 module_put(net_families[family]->owner);
1157 int sock_create(int family, int type, int protocol, struct socket **res)
1159 return __sock_create(family, type, protocol, res, 0);
1162 int sock_create_kern(int family, int type, int protocol, struct socket **res)
1164 return __sock_create(family, type, protocol, res, 1);
1167 asmlinkage long sys_socket(int family, int type, int protocol)
1170 struct socket *sock;
1172 retval = sock_create(family, type, protocol, &sock);
1176 set_bit(SOCK_USER_SOCKET, &sock->flags);
1177 retval = sock_map_fd(sock);
1182 /* It may be already another descriptor 8) Not kernel problem. */
1191 * Create a pair of connected sockets.
1194 asmlinkage long sys_socketpair(int family, int type, int protocol, int __user *usockvec)
1196 struct socket *sock1, *sock2;
1200 * Obtain the first socket and check if the underlying protocol
1201 * supports the socketpair call.
1204 err = sock_create(family, type, protocol, &sock1);
1207 set_bit(SOCK_USER_SOCKET, &sock1->flags);
1209 err = sock_create(family, type, protocol, &sock2);
1212 set_bit(SOCK_USER_SOCKET, &sock2->flags);
1214 err = sock1->ops->socketpair(sock1, sock2);
1216 goto out_release_both;
1220 err = sock_map_fd(sock1);
1222 goto out_release_both;
1225 err = sock_map_fd(sock2);
1230 /* fd1 and fd2 may be already another descriptors.
1231 * Not kernel problem.
1234 err = put_user(fd1, &usockvec[0]);
1236 err = put_user(fd2, &usockvec[1]);
1245 sock_release(sock2);
1250 sock_release(sock2);
1252 sock_release(sock1);
1259 * Bind a name to a socket. Nothing much to do here since it's
1260 * the protocol's responsibility to handle the local address.
1262 * We move the socket address to kernel space before we call
1263 * the protocol layer (having also checked the address is ok).
1266 asmlinkage long sys_bind(int fd, struct sockaddr __user *umyaddr, int addrlen)
1268 struct socket *sock;
1269 char address[MAX_SOCK_ADDR];
1272 if((sock = sockfd_lookup(fd,&err))!=NULL)
1274 if((err=move_addr_to_kernel(umyaddr,addrlen,address))>=0) {
1275 err = security_socket_bind(sock, (struct sockaddr *)address, addrlen);
1280 err = sock->ops->bind(sock, (struct sockaddr *)address, addrlen);
1289 * Perform a listen. Basically, we allow the protocol to do anything
1290 * necessary for a listen, and if that works, we mark the socket as
1291 * ready for listening.
1294 int sysctl_somaxconn = SOMAXCONN;
1296 asmlinkage long sys_listen(int fd, int backlog)
1298 struct socket *sock;
1301 if ((sock = sockfd_lookup(fd, &err)) != NULL) {
1302 if ((unsigned) backlog > sysctl_somaxconn)
1303 backlog = sysctl_somaxconn;
1305 err = security_socket_listen(sock, backlog);
1311 err=sock->ops->listen(sock, backlog);
1319 * For accept, we attempt to create a new socket, set up the link
1320 * with the client, wake up the client, then return the new
1321 * connected fd. We collect the address of the connector in kernel
1322 * space and move it to user at the very end. This is unclean because
1323 * we open the socket then return an error.
1325 * 1003.1g adds the ability to recvmsg() to query connection pending
1326 * status to recvmsg. We need to add that support in a way thats
1327 * clean when we restucture accept also.
1330 asmlinkage long sys_accept(int fd, struct sockaddr __user *upeer_sockaddr, int __user *upeer_addrlen)
1332 struct socket *sock, *newsock;
1334 char address[MAX_SOCK_ADDR];
1336 sock = sockfd_lookup(fd, &err);
1341 if (!(newsock = sock_alloc()))
1344 newsock->type = sock->type;
1345 newsock->ops = sock->ops;
1347 err = security_socket_accept(sock, newsock);
1352 * We don't need try_module_get here, as the listening socket (sock)
1353 * has the protocol module (sock->ops->owner) held.
1355 __module_get(newsock->ops->owner);
1357 err = sock->ops->accept(sock, newsock, sock->file->f_flags);
1361 if (upeer_sockaddr) {
1362 if(newsock->ops->getname(newsock, (struct sockaddr *)address, &len, 2)<0) {
1363 err = -ECONNABORTED;
1366 err = move_addr_to_user(address, len, upeer_sockaddr, upeer_addrlen);
1371 /* File flags are not inherited via accept() unlike another OSes. */
1373 if ((err = sock_map_fd(newsock)) < 0)
1376 security_socket_post_accept(sock, newsock);
1383 sock_release(newsock);
1389 * Attempt to connect to a socket with the server address. The address
1390 * is in user space so we verify it is OK and move it to kernel space.
1392 * For 1003.1g we need to add clean support for a bind to AF_UNSPEC to
1395 * NOTE: 1003.1g draft 6.3 is broken with respect to AX.25/NetROM and
1396 * other SEQPACKET protocols that take time to connect() as it doesn't
1397 * include the -EINPROGRESS status for such sockets.
1400 asmlinkage long sys_connect(int fd, struct sockaddr __user *uservaddr, int addrlen)
1402 struct socket *sock;
1403 char address[MAX_SOCK_ADDR];
1406 sock = sockfd_lookup(fd, &err);
1409 err = move_addr_to_kernel(uservaddr, addrlen, address);
1413 err = security_socket_connect(sock, (struct sockaddr *)address, addrlen);
1417 err = sock->ops->connect(sock, (struct sockaddr *) address, addrlen,
1418 sock->file->f_flags);
1426 * Get the local address ('name') of a socket object. Move the obtained
1427 * name to user space.
1430 asmlinkage long sys_getsockname(int fd, struct sockaddr __user *usockaddr, int __user *usockaddr_len)
1432 struct socket *sock;
1433 char address[MAX_SOCK_ADDR];
1436 sock = sockfd_lookup(fd, &err);
1440 err = security_socket_getsockname(sock);
1444 err = sock->ops->getname(sock, (struct sockaddr *)address, &len, 0);
1447 err = move_addr_to_user(address, len, usockaddr, usockaddr_len);
1456 * Get the remote address ('name') of a socket object. Move the obtained
1457 * name to user space.
1460 asmlinkage long sys_getpeername(int fd, struct sockaddr __user *usockaddr, int __user *usockaddr_len)
1462 struct socket *sock;
1463 char address[MAX_SOCK_ADDR];
1466 if ((sock = sockfd_lookup(fd, &err))!=NULL)
1468 err = security_socket_getpeername(sock);
1474 err = sock->ops->getname(sock, (struct sockaddr *)address, &len, 1);
1476 err=move_addr_to_user(address,len, usockaddr, usockaddr_len);
1483 * Send a datagram to a given address. We move the address into kernel
1484 * space and check the user space data area is readable before invoking
1488 asmlinkage long sys_sendto(int fd, void __user * buff, size_t len, unsigned flags,
1489 struct sockaddr __user *addr, int addr_len)
1491 struct socket *sock;
1492 char address[MAX_SOCK_ADDR];
1497 sock = sockfd_lookup(fd, &err);
1505 msg.msg_control=NULL;
1506 msg.msg_controllen=0;
1510 err = move_addr_to_kernel(addr, addr_len, address);
1513 msg.msg_name=address;
1514 msg.msg_namelen=addr_len;
1516 if (sock->file->f_flags & O_NONBLOCK)
1517 flags |= MSG_DONTWAIT;
1518 msg.msg_flags = flags;
1519 err = sock_sendmsg(sock, &msg, len);
1528 * Send a datagram down a socket.
1531 asmlinkage long sys_send(int fd, void __user * buff, size_t len, unsigned flags)
1533 return sys_sendto(fd, buff, len, flags, NULL, 0);
1537 * Receive a frame from the socket and optionally record the address of the
1538 * sender. We verify the buffers are writable and if needed move the
1539 * sender address from kernel to user space.
1542 asmlinkage long sys_recvfrom(int fd, void __user * ubuf, size_t size, unsigned flags,
1543 struct sockaddr __user *addr, int __user *addr_len)
1545 struct socket *sock;
1548 char address[MAX_SOCK_ADDR];
1551 sock = sockfd_lookup(fd, &err);
1555 msg.msg_control=NULL;
1556 msg.msg_controllen=0;
1561 msg.msg_name=address;
1562 msg.msg_namelen=MAX_SOCK_ADDR;
1563 if (sock->file->f_flags & O_NONBLOCK)
1564 flags |= MSG_DONTWAIT;
1565 err=sock_recvmsg(sock, &msg, size, flags);
1567 if(err >= 0 && addr != NULL)
1569 err2=move_addr_to_user(address, msg.msg_namelen, addr, addr_len);
1579 * Receive a datagram from a socket.
1582 asmlinkage long sys_recv(int fd, void __user * ubuf, size_t size, unsigned flags)
1584 return sys_recvfrom(fd, ubuf, size, flags, NULL, NULL);
1588 * Set a socket option. Because we don't know the option lengths we have
1589 * to pass the user mode parameter for the protocols to sort out.
1592 asmlinkage long sys_setsockopt(int fd, int level, int optname, char __user *optval, int optlen)
1595 struct socket *sock;
1600 if ((sock = sockfd_lookup(fd, &err))!=NULL)
1602 err = security_socket_setsockopt(sock,level,optname);
1608 if (level == SOL_SOCKET)
1609 err=sock_setsockopt(sock,level,optname,optval,optlen);
1611 err=sock->ops->setsockopt(sock, level, optname, optval, optlen);
1618 * Get a socket option. Because we don't know the option lengths we have
1619 * to pass a user mode parameter for the protocols to sort out.
1622 asmlinkage long sys_getsockopt(int fd, int level, int optname, char __user *optval, int __user *optlen)
1625 struct socket *sock;
1627 if ((sock = sockfd_lookup(fd, &err))!=NULL)
1629 err = security_socket_getsockopt(sock, level,
1636 if (level == SOL_SOCKET)
1637 err=sock_getsockopt(sock,level,optname,optval,optlen);
1639 err=sock->ops->getsockopt(sock, level, optname, optval, optlen);
1647 * Shutdown a socket.
1650 asmlinkage long sys_shutdown(int fd, int how)
1653 struct socket *sock;
1655 if ((sock = sockfd_lookup(fd, &err))!=NULL)
1657 err = security_socket_shutdown(sock, how);
1663 err=sock->ops->shutdown(sock, how);
1669 /* A couple of helpful macros for getting the address of the 32/64 bit
1670 * fields which are the same type (int / unsigned) on our platforms.
1672 #define COMPAT_MSG(msg, member) ((MSG_CMSG_COMPAT & flags) ? &msg##_compat->member : &msg->member)
1673 #define COMPAT_NAMELEN(msg) COMPAT_MSG(msg, msg_namelen)
1674 #define COMPAT_FLAGS(msg) COMPAT_MSG(msg, msg_flags)
1678 * BSD sendmsg interface
1681 asmlinkage long sys_sendmsg(int fd, struct msghdr __user *msg, unsigned flags)
1683 struct compat_msghdr __user *msg_compat = (struct compat_msghdr __user *)msg;
1684 struct socket *sock;
1685 char address[MAX_SOCK_ADDR];
1686 struct iovec iovstack[UIO_FASTIOV], *iov = iovstack;
1687 unsigned char ctl[sizeof(struct cmsghdr) + 20]; /* 20 is size of ipv6_pktinfo */
1688 unsigned char *ctl_buf = ctl;
1689 struct msghdr msg_sys;
1690 int err, ctl_len, iov_size, total_len;
1693 if (MSG_CMSG_COMPAT & flags) {
1694 if (get_compat_msghdr(&msg_sys, msg_compat))
1696 } else if (copy_from_user(&msg_sys, msg, sizeof(struct msghdr)))
1699 sock = sockfd_lookup(fd, &err);
1703 /* do not move before msg_sys is valid */
1705 if (msg_sys.msg_iovlen > UIO_MAXIOV)
1708 /* Check whether to allocate the iovec area*/
1710 iov_size = msg_sys.msg_iovlen * sizeof(struct iovec);
1711 if (msg_sys.msg_iovlen > UIO_FASTIOV) {
1712 iov = sock_kmalloc(sock->sk, iov_size, GFP_KERNEL);
1717 /* This will also move the address data into kernel space */
1718 if (MSG_CMSG_COMPAT & flags) {
1719 err = verify_compat_iovec(&msg_sys, iov, address, VERIFY_READ);
1721 err = verify_iovec(&msg_sys, iov, address, VERIFY_READ);
1728 if (msg_sys.msg_controllen > INT_MAX)
1730 ctl_len = msg_sys.msg_controllen;
1731 if ((MSG_CMSG_COMPAT & flags) && ctl_len) {
1732 err = cmsghdr_from_user_compat_to_kern(&msg_sys, ctl, sizeof(ctl));
1735 ctl_buf = msg_sys.msg_control;
1736 } else if (ctl_len) {
1737 if (ctl_len > sizeof(ctl))
1739 ctl_buf = sock_kmalloc(sock->sk, ctl_len, GFP_KERNEL);
1740 if (ctl_buf == NULL)
1745 * Careful! Before this, msg_sys.msg_control contains a user pointer.
1746 * Afterwards, it will be a kernel pointer. Thus the compiler-assisted
1747 * checking falls down on this.
1749 if (copy_from_user(ctl_buf, (void __user *) msg_sys.msg_control, ctl_len))
1751 msg_sys.msg_control = ctl_buf;
1753 msg_sys.msg_flags = flags;
1755 if (sock->file->f_flags & O_NONBLOCK)
1756 msg_sys.msg_flags |= MSG_DONTWAIT;
1757 err = sock_sendmsg(sock, &msg_sys, total_len);
1761 sock_kfree_s(sock->sk, ctl_buf, ctl_len);
1763 if (iov != iovstack)
1764 sock_kfree_s(sock->sk, iov, iov_size);
1772 * BSD recvmsg interface
1775 asmlinkage long sys_recvmsg(int fd, struct msghdr __user *msg, unsigned int flags)
1777 struct compat_msghdr __user *msg_compat = (struct compat_msghdr __user *)msg;
1778 struct socket *sock;
1779 struct iovec iovstack[UIO_FASTIOV];
1780 struct iovec *iov=iovstack;
1781 struct msghdr msg_sys;
1782 unsigned long cmsg_ptr;
1783 int err, iov_size, total_len, len;
1785 /* kernel mode address */
1786 char addr[MAX_SOCK_ADDR];
1788 /* user mode address pointers */
1789 struct sockaddr __user *uaddr;
1790 int __user *uaddr_len;
1792 if (MSG_CMSG_COMPAT & flags) {
1793 if (get_compat_msghdr(&msg_sys, msg_compat))
1796 if (copy_from_user(&msg_sys,msg,sizeof(struct msghdr)))
1799 sock = sockfd_lookup(fd, &err);
1804 if (msg_sys.msg_iovlen > UIO_MAXIOV)
1807 /* Check whether to allocate the iovec area*/
1809 iov_size = msg_sys.msg_iovlen * sizeof(struct iovec);
1810 if (msg_sys.msg_iovlen > UIO_FASTIOV) {
1811 iov = sock_kmalloc(sock->sk, iov_size, GFP_KERNEL);
1817 * Save the user-mode address (verify_iovec will change the
1818 * kernel msghdr to use the kernel address space)
1821 uaddr = (void __user *) msg_sys.msg_name;
1822 uaddr_len = COMPAT_NAMELEN(msg);
1823 if (MSG_CMSG_COMPAT & flags) {
1824 err = verify_compat_iovec(&msg_sys, iov, addr, VERIFY_WRITE);
1826 err = verify_iovec(&msg_sys, iov, addr, VERIFY_WRITE);
1831 cmsg_ptr = (unsigned long)msg_sys.msg_control;
1832 msg_sys.msg_flags = 0;
1833 if (MSG_CMSG_COMPAT & flags)
1834 msg_sys.msg_flags = MSG_CMSG_COMPAT;
1836 if (sock->file->f_flags & O_NONBLOCK)
1837 flags |= MSG_DONTWAIT;
1838 err = sock_recvmsg(sock, &msg_sys, total_len, flags);
1843 if (uaddr != NULL) {
1844 err = move_addr_to_user(addr, msg_sys.msg_namelen, uaddr, uaddr_len);
1848 err = __put_user(msg_sys.msg_flags, COMPAT_FLAGS(msg));
1851 if (MSG_CMSG_COMPAT & flags)
1852 err = __put_user((unsigned long)msg_sys.msg_control-cmsg_ptr,
1853 &msg_compat->msg_controllen);
1855 err = __put_user((unsigned long)msg_sys.msg_control-cmsg_ptr,
1856 &msg->msg_controllen);
1862 if (iov != iovstack)
1863 sock_kfree_s(sock->sk, iov, iov_size);
1870 #ifdef __ARCH_WANT_SYS_SOCKETCALL
1872 /* Argument list sizes for sys_socketcall */
1873 #define AL(x) ((x) * sizeof(unsigned long))
1874 static unsigned char nargs[18]={AL(0),AL(3),AL(3),AL(3),AL(2),AL(3),
1875 AL(3),AL(3),AL(4),AL(4),AL(4),AL(6),
1876 AL(6),AL(2),AL(5),AL(5),AL(3),AL(3)};
1880 * System call vectors.
1882 * Argument checking cleaned up. Saved 20% in size.
1883 * This function doesn't need to set the kernel lock because
1884 * it is set by the callees.
1887 asmlinkage long sys_socketcall(int call, unsigned long __user *args)
1890 unsigned long a0,a1;
1893 if(call<1||call>SYS_RECVMSG)
1896 /* copy_from_user should be SMP safe. */
1897 if (copy_from_user(a, args, nargs[call]))
1906 err = sys_socket(a0,a1,a[2]);
1909 err = sys_bind(a0,(struct sockaddr __user *)a1, a[2]);
1912 err = sys_connect(a0, (struct sockaddr __user *)a1, a[2]);
1915 err = sys_listen(a0,a1);
1918 err = sys_accept(a0,(struct sockaddr __user *)a1, (int __user *)a[2]);
1920 case SYS_GETSOCKNAME:
1921 err = sys_getsockname(a0,(struct sockaddr __user *)a1, (int __user *)a[2]);
1923 case SYS_GETPEERNAME:
1924 err = sys_getpeername(a0, (struct sockaddr __user *)a1, (int __user *)a[2]);
1926 case SYS_SOCKETPAIR:
1927 err = sys_socketpair(a0,a1, a[2], (int __user *)a[3]);
1930 err = sys_send(a0, (void __user *)a1, a[2], a[3]);
1933 err = sys_sendto(a0,(void __user *)a1, a[2], a[3],
1934 (struct sockaddr __user *)a[4], a[5]);
1937 err = sys_recv(a0, (void __user *)a1, a[2], a[3]);
1940 err = sys_recvfrom(a0, (void __user *)a1, a[2], a[3],
1941 (struct sockaddr __user *)a[4], (int __user *)a[5]);
1944 err = sys_shutdown(a0,a1);
1946 case SYS_SETSOCKOPT:
1947 err = sys_setsockopt(a0, a1, a[2], (char __user *)a[3], a[4]);
1949 case SYS_GETSOCKOPT:
1950 err = sys_getsockopt(a0, a1, a[2], (char __user *)a[3], (int __user *)a[4]);
1953 err = sys_sendmsg(a0, (struct msghdr __user *) a1, a[2]);
1956 err = sys_recvmsg(a0, (struct msghdr __user *) a1, a[2]);
1965 #endif /* __ARCH_WANT_SYS_SOCKETCALL */
1968 * This function is called by a protocol handler that wants to
1969 * advertise its address family, and have it linked into the
1973 int sock_register(struct net_proto_family *ops)
1977 if (ops->family >= NPROTO) {
1978 printk(KERN_CRIT "protocol %d >= NPROTO(%d)\n", ops->family, NPROTO);
1981 net_family_write_lock();
1983 if (net_families[ops->family] == NULL) {
1984 net_families[ops->family]=ops;
1987 net_family_write_unlock();
1988 printk(KERN_INFO "NET: Registered protocol family %d\n",
1994 * This function is called by a protocol handler that wants to
1995 * remove its address family, and have it unlinked from the
1999 int sock_unregister(int family)
2001 if (family < 0 || family >= NPROTO)
2004 net_family_write_lock();
2005 net_families[family]=NULL;
2006 net_family_write_unlock();
2007 printk(KERN_INFO "NET: Unregistered protocol family %d\n",
2013 extern void sk_init(void);
2015 void __init sock_init(void)
2020 * Initialize all address (protocol) families.
2023 for (i = 0; i < NPROTO; i++)
2024 net_families[i] = NULL;
2027 * Initialize sock SLAB cache.
2034 * Initialize skbuff SLAB cache
2040 * Initialize the protocols module.
2044 register_filesystem(&sock_fs_type);
2045 sock_mnt = kern_mount(&sock_fs_type);
2046 /* The real protocol initialization is performed when
2047 * do_initcalls is run.
2050 #ifdef CONFIG_NETFILTER
2058 #ifdef CONFIG_TUX_MODULE
2060 asmlinkage long (*sys_tux_ptr) (unsigned int action, user_req_t *u_info) = NULL;
2062 struct module *tux_module = NULL;
2063 spinlock_t tux_module_lock = SPIN_LOCK_UNLOCKED;
2065 asmlinkage long sys_tux (unsigned int action, user_req_t *u_info)
2069 if (current->tux_info)
2070 return sys_tux_ptr(action, u_info);
2073 spin_lock(&tux_module_lock);
2076 if (!try_module_get(tux_module))
2078 spin_unlock(&tux_module_lock);
2082 ret = sys_tux_ptr(action, u_info);
2084 spin_lock(&tux_module_lock);
2085 module_put(tux_module);
2087 spin_unlock(&tux_module_lock);
2092 EXPORT_SYMBOL_GPL(tux_module);
2093 EXPORT_SYMBOL_GPL(tux_module_lock);
2094 EXPORT_SYMBOL_GPL(sys_tux_ptr);
2096 EXPORT_SYMBOL_GPL(tux_Dprintk);
2097 EXPORT_SYMBOL_GPL(tux_TDprintk);
2100 #ifdef CONFIG_PROC_FS
2101 void socket_seq_show(struct seq_file *seq)
2106 for (cpu = 0; cpu < NR_CPUS; cpu++)
2107 counter += per_cpu(sockets_in_use, cpu);
2109 /* It can be negative, by the way. 8) */
2113 seq_printf(seq, "sockets: used %d\n", counter);
2115 #endif /* CONFIG_PROC_FS */
2117 /* ABI emulation layers need these two */
2118 EXPORT_SYMBOL(move_addr_to_kernel);
2119 EXPORT_SYMBOL(move_addr_to_user);
2120 EXPORT_SYMBOL(sock_alloc);
2121 EXPORT_SYMBOL(sock_alloc_inode);
2122 EXPORT_SYMBOL(sock_create);
2123 EXPORT_SYMBOL(sock_create_kern);
2124 EXPORT_SYMBOL(sock_create_lite);
2125 EXPORT_SYMBOL(sock_map_fd);
2126 EXPORT_SYMBOL(sock_recvmsg);
2127 EXPORT_SYMBOL(sock_register);
2128 EXPORT_SYMBOL(sock_release);
2129 EXPORT_SYMBOL(sock_sendmsg);
2130 EXPORT_SYMBOL(sock_unregister);
2131 EXPORT_SYMBOL(sock_wake_async);
2132 EXPORT_SYMBOL(sockfd_lookup);