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>
98 static int sock_no_open(struct inode *irrelevant, struct file *dontcare);
99 static ssize_t sock_aio_read(struct kiocb *iocb, char __user *buf,
100 size_t size, loff_t pos);
101 static ssize_t sock_aio_write(struct kiocb *iocb, const char __user *buf,
102 size_t size, loff_t pos);
103 static int sock_mmap(struct file *file, struct vm_area_struct * vma);
105 static int sock_close(struct inode *inode, struct file *file);
106 static unsigned int sock_poll(struct file *file,
107 struct poll_table_struct *wait);
108 static int sock_ioctl(struct inode *inode, struct file *file,
109 unsigned int cmd, unsigned long arg);
110 static int sock_fasync(int fd, struct file *filp, int on);
111 static ssize_t sock_readv(struct file *file, const struct iovec *vector,
112 unsigned long count, loff_t *ppos);
113 static ssize_t sock_writev(struct file *file, const struct iovec *vector,
114 unsigned long count, loff_t *ppos);
115 static ssize_t sock_sendpage(struct file *file, struct page *page,
116 int offset, size_t size, loff_t *ppos, int more);
120 * Socket files have a set of 'special' operations as well as the generic file ones. These don't appear
121 * in the operation structures but are done directly via the socketcall() multiplexor.
124 struct file_operations socket_file_ops = {
125 .owner = THIS_MODULE,
127 .aio_read = sock_aio_read,
128 .aio_write = sock_aio_write,
132 .open = sock_no_open, /* special open code to disallow open via /proc */
133 .release = sock_close,
134 .fasync = sock_fasync,
136 .writev = sock_writev,
137 .sendpage = sock_sendpage
141 * The protocol list. Each protocol is registered in here.
144 static struct net_proto_family *net_families[NPROTO];
146 #if defined(CONFIG_SMP) || defined(CONFIG_PREEMPT)
147 static atomic_t net_family_lockct = ATOMIC_INIT(0);
148 static spinlock_t net_family_lock = SPIN_LOCK_UNLOCKED;
150 /* The strategy is: modifications net_family vector are short, do not
151 sleep and veeery rare, but read access should be free of any exclusive
155 static void net_family_write_lock(void)
157 spin_lock(&net_family_lock);
158 while (atomic_read(&net_family_lockct) != 0) {
159 spin_unlock(&net_family_lock);
163 spin_lock(&net_family_lock);
167 static __inline__ void net_family_write_unlock(void)
169 spin_unlock(&net_family_lock);
172 static __inline__ void net_family_read_lock(void)
174 atomic_inc(&net_family_lockct);
175 spin_unlock_wait(&net_family_lock);
178 static __inline__ void net_family_read_unlock(void)
180 atomic_dec(&net_family_lockct);
184 #define net_family_write_lock() do { } while(0)
185 #define net_family_write_unlock() do { } while(0)
186 #define net_family_read_lock() do { } while(0)
187 #define net_family_read_unlock() do { } while(0)
192 * Statistics counters of the socket lists
195 static DEFINE_PER_CPU(int, sockets_in_use) = 0;
198 * Support routines. Move socket addresses back and forth across the kernel/user
199 * divide and look after the messy bits.
202 #define MAX_SOCK_ADDR 128 /* 108 for Unix domain -
203 16 for IP, 16 for IPX,
206 must be at least one bigger than
207 the AF_UNIX size (see net/unix/af_unix.c
212 * move_addr_to_kernel - copy a socket address into kernel space
213 * @uaddr: Address in user space
214 * @kaddr: Address in kernel space
215 * @ulen: Length in user space
217 * The address is copied into kernel space. If the provided address is
218 * too long an error code of -EINVAL is returned. If the copy gives
219 * invalid addresses -EFAULT is returned. On a success 0 is returned.
222 int move_addr_to_kernel(void __user *uaddr, int ulen, void *kaddr)
224 if(ulen<0||ulen>MAX_SOCK_ADDR)
228 if(copy_from_user(kaddr,uaddr,ulen))
234 * move_addr_to_user - copy an address to user space
235 * @kaddr: kernel space address
236 * @klen: length of address in kernel
237 * @uaddr: user space address
238 * @ulen: pointer to user length field
240 * The value pointed to by ulen on entry is the buffer length available.
241 * This is overwritten with the buffer space used. -EINVAL is returned
242 * if an overlong buffer is specified or a negative buffer size. -EFAULT
243 * is returned if either the buffer or the length field are not
245 * After copying the data up to the limit the user specifies, the true
246 * length of the data is written over the length limit the user
247 * specified. Zero is returned for a success.
250 int move_addr_to_user(void *kaddr, int klen, void __user *uaddr, int __user *ulen)
255 if((err=get_user(len, ulen)))
259 if(len<0 || len> MAX_SOCK_ADDR)
263 if(copy_to_user(uaddr,kaddr,len))
267 * "fromlen shall refer to the value before truncation.."
270 return __put_user(klen, ulen);
273 #define SOCKFS_MAGIC 0x534F434B
275 static kmem_cache_t * sock_inode_cachep;
277 static struct inode *sock_alloc_inode(struct super_block *sb)
279 struct socket_alloc *ei;
280 ei = (struct socket_alloc *)kmem_cache_alloc(sock_inode_cachep, SLAB_KERNEL);
283 init_waitqueue_head(&ei->socket.wait);
285 ei->socket.fasync_list = NULL;
286 ei->socket.state = SS_UNCONNECTED;
287 ei->socket.flags = 0;
288 ei->socket.ops = NULL;
289 ei->socket.sk = NULL;
290 ei->socket.file = NULL;
291 ei->socket.flags = 0;
293 return &ei->vfs_inode;
296 static void sock_destroy_inode(struct inode *inode)
298 kmem_cache_free(sock_inode_cachep,
299 container_of(inode, struct socket_alloc, vfs_inode));
302 static void init_once(void * foo, kmem_cache_t * cachep, unsigned long flags)
304 struct socket_alloc *ei = (struct socket_alloc *) foo;
306 if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
307 SLAB_CTOR_CONSTRUCTOR)
308 inode_init_once(&ei->vfs_inode);
311 static int init_inodecache(void)
313 sock_inode_cachep = kmem_cache_create("sock_inode_cache",
314 sizeof(struct socket_alloc),
315 0, SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT,
317 if (sock_inode_cachep == NULL)
322 static struct super_operations sockfs_ops = {
323 .alloc_inode = sock_alloc_inode,
324 .destroy_inode =sock_destroy_inode,
325 .statfs = simple_statfs,
328 static struct super_block *sockfs_get_sb(struct file_system_type *fs_type,
329 int flags, const char *dev_name, void *data)
331 return get_sb_pseudo(fs_type, "socket:", &sockfs_ops, SOCKFS_MAGIC);
334 static struct vfsmount *sock_mnt;
336 static struct file_system_type sock_fs_type = {
338 .get_sb = sockfs_get_sb,
339 .kill_sb = kill_anon_super,
341 static int sockfs_delete_dentry(struct dentry *dentry)
345 static struct dentry_operations sockfs_dentry_operations = {
346 .d_delete = sockfs_delete_dentry,
350 * Obtains the first available file descriptor and sets it up for use.
352 * This function creates file structure and maps it to fd space
353 * of current process. On success it returns file descriptor
354 * and file struct implicitly stored in sock->file.
355 * Note that another thread may close file descriptor before we return
356 * from this function. We use the fact that now we do not refer
357 * to socket after mapping. If one day we will need it, this
358 * function will increment ref. count on file by 1.
360 * In any case returned fd MAY BE not valid!
361 * This race condition is unavoidable
362 * with shared fd spaces, we cannot solve it inside kernel,
363 * but we take care of internal coherence yet.
366 struct file * sock_map_file(struct socket *sock)
372 file = get_empty_filp();
375 return ERR_PTR(-ENFILE);
377 sprintf(name, "[%lu]", SOCK_INODE(sock)->i_ino);
379 this.len = strlen(name);
380 this.hash = SOCK_INODE(sock)->i_ino;
382 file->f_dentry = d_alloc(sock_mnt->mnt_sb->s_root, &this);
383 if (!file->f_dentry) {
385 return ERR_PTR(-ENOMEM);
387 file->f_dentry->d_op = &sockfs_dentry_operations;
388 d_add(file->f_dentry, SOCK_INODE(sock));
389 file->f_vfsmnt = mntget(sock_mnt);
390 file->f_mapping = file->f_dentry->d_inode->i_mapping;
395 file->f_op = SOCK_INODE(sock)->i_fop = &socket_file_ops;
397 file->f_flags = O_RDWR;
403 int sock_map_fd(struct socket *sock)
409 * Find a file descriptor suitable for return to the user.
412 fd = get_unused_fd();
416 file = sock_map_file(sock);
419 return PTR_ERR(file);
421 fd_install(fd, file);
427 * sockfd_lookup - Go from a file number to its socket slot
429 * @err: pointer to an error code return
431 * The file handle passed in is locked and the socket it is bound
432 * too is returned. If an error occurs the err pointer is overwritten
433 * with a negative errno code and NULL is returned. The function checks
434 * for both invalid handles and passing a handle which is not a socket.
436 * On a success the socket object pointer is returned.
439 struct socket *sockfd_lookup(int fd, int *err)
445 if (!(file = fget(fd)))
451 inode = file->f_dentry->d_inode;
452 if (!inode->i_sock || !(sock = SOCKET_I(inode)))
459 if (sock->file != file) {
460 printk(KERN_ERR "socki_lookup: socket file changed!\n");
467 * sock_alloc - allocate a socket
469 * Allocate a new inode and socket object. The two are bound together
470 * and initialised. The socket is then returned. If we are out of inodes
474 struct socket *sock_alloc(void)
476 struct inode * inode;
477 struct socket * sock;
479 inode = new_inode(sock_mnt->mnt_sb);
483 sock = SOCKET_I(inode);
485 inode->i_mode = S_IFSOCK|S_IRWXUGO;
487 inode->i_uid = current->fsuid;
488 inode->i_gid = current->fsgid;
490 get_cpu_var(sockets_in_use)++;
491 put_cpu_var(sockets_in_use);
496 * In theory you can't get an open on this inode, but /proc provides
497 * a back door. Remember to keep it shut otherwise you'll let the
498 * creepy crawlies in.
501 static int sock_no_open(struct inode *irrelevant, struct file *dontcare)
506 struct file_operations bad_sock_fops = {
507 .owner = THIS_MODULE,
508 .open = sock_no_open,
512 * sock_release - close a socket
513 * @sock: socket to close
515 * The socket is released from the protocol stack if it has a release
516 * callback, and the inode is then released if the socket is bound to
517 * an inode not a file.
520 void sock_release(struct socket *sock)
523 struct module *owner = sock->ops->owner;
525 sock->ops->release(sock);
530 if (sock->fasync_list)
531 printk(KERN_ERR "sock_release: fasync list not empty!\n");
533 get_cpu_var(sockets_in_use)--;
534 put_cpu_var(sockets_in_use);
536 iput(SOCK_INODE(sock));
542 static inline int __sock_sendmsg(struct kiocb *iocb, struct socket *sock,
543 struct msghdr *msg, size_t size)
545 struct sock_iocb *si = kiocb_to_siocb(iocb);
553 err = security_socket_sendmsg(sock, msg, size);
557 len = sock->ops->sendmsg(iocb, sock, msg, size);
560 vx_sock_send(sock->sk, size);
562 vx_sock_fail(sock->sk, size);
564 vxdprintk("__sock_sendmsg: %p[%p,%p,%p;%d]:%d/%d\n",
566 (sock->sk)?sock->sk->sk_nx_info:0,
567 (sock->sk)?sock->sk->sk_vx_info:0,
568 (sock->sk)?sock->sk->sk_xid:0,
573 int sock_sendmsg(struct socket *sock, struct msghdr *msg, size_t size)
578 init_sync_kiocb(&iocb, NULL);
579 ret = __sock_sendmsg(&iocb, sock, msg, size);
580 if (-EIOCBQUEUED == ret)
581 ret = wait_on_sync_kiocb(&iocb);
586 static inline int __sock_recvmsg(struct kiocb *iocb, struct socket *sock,
587 struct msghdr *msg, size_t size, int flags)
590 struct sock_iocb *si = kiocb_to_siocb(iocb);
598 err = security_socket_recvmsg(sock, msg, size, flags);
602 len = sock->ops->recvmsg(iocb, sock, msg, size, flags);
603 if ((len >= 0) && sock->sk)
604 vx_sock_recv(sock->sk, len);
605 vxdprintk("__sock_recvmsg: %p[%p,%p,%p;%d]:%d/%d\n",
607 (sock->sk)?sock->sk->sk_nx_info:0,
608 (sock->sk)?sock->sk->sk_vx_info:0,
609 (sock->sk)?sock->sk->sk_xid:0,
614 int sock_recvmsg(struct socket *sock, struct msghdr *msg,
615 size_t size, int flags)
620 init_sync_kiocb(&iocb, NULL);
621 ret = __sock_recvmsg(&iocb, sock, msg, size, flags);
622 if (-EIOCBQUEUED == ret)
623 ret = wait_on_sync_kiocb(&iocb);
628 * Read data from a socket. ubuf is a user mode pointer. We make sure the user
629 * area ubuf...ubuf+size-1 is writable before asking the protocol.
632 static ssize_t sock_aio_read(struct kiocb *iocb, char __user *ubuf,
633 size_t size, loff_t pos)
635 struct sock_iocb *x = kiocb_to_siocb(iocb);
641 if (size==0) /* Match SYS5 behaviour */
644 sock = SOCKET_I(iocb->ki_filp->f_dentry->d_inode);
646 x->async_msg.msg_name = NULL;
647 x->async_msg.msg_namelen = 0;
648 x->async_msg.msg_iov = &x->async_iov;
649 x->async_msg.msg_iovlen = 1;
650 x->async_msg.msg_control = NULL;
651 x->async_msg.msg_controllen = 0;
652 x->async_iov.iov_base = ubuf;
653 x->async_iov.iov_len = size;
654 flags = !(iocb->ki_filp->f_flags & O_NONBLOCK) ? 0 : MSG_DONTWAIT;
656 return __sock_recvmsg(iocb, sock, &x->async_msg, size, flags);
661 * Write data to a socket. We verify that the user area ubuf..ubuf+size-1
662 * is readable by the user process.
665 static ssize_t sock_aio_write(struct kiocb *iocb, const char __user *ubuf,
666 size_t size, loff_t pos)
668 struct sock_iocb *x = kiocb_to_siocb(iocb);
673 if(size==0) /* Match SYS5 behaviour */
676 sock = SOCKET_I(iocb->ki_filp->f_dentry->d_inode);
678 x->async_msg.msg_name = NULL;
679 x->async_msg.msg_namelen = 0;
680 x->async_msg.msg_iov = &x->async_iov;
681 x->async_msg.msg_iovlen = 1;
682 x->async_msg.msg_control = NULL;
683 x->async_msg.msg_controllen = 0;
684 x->async_msg.msg_flags = !(iocb->ki_filp->f_flags & O_NONBLOCK) ? 0 : MSG_DONTWAIT;
685 if (sock->type == SOCK_SEQPACKET)
686 x->async_msg.msg_flags |= MSG_EOR;
687 x->async_iov.iov_base = (void __user *)ubuf;
688 x->async_iov.iov_len = size;
690 return __sock_sendmsg(iocb, sock, &x->async_msg, size);
693 ssize_t sock_sendpage(struct file *file, struct page *page,
694 int offset, size_t size, loff_t *ppos, int more)
699 if (ppos != &file->f_pos)
702 sock = SOCKET_I(file->f_dentry->d_inode);
704 flags = !(file->f_flags & O_NONBLOCK) ? 0 : MSG_DONTWAIT;
708 return sock->ops->sendpage(sock, page, offset, size, flags);
711 int sock_readv_writev(int type, struct inode * inode, struct file * file,
712 const struct iovec * iov, long count, size_t size)
717 sock = SOCKET_I(inode);
721 msg.msg_control = NULL;
722 msg.msg_controllen = 0;
723 msg.msg_iov = (struct iovec *) iov;
724 msg.msg_iovlen = count;
725 msg.msg_flags = (file->f_flags & O_NONBLOCK) ? MSG_DONTWAIT : 0;
727 /* read() does a VERIFY_WRITE */
728 if (type == VERIFY_WRITE)
729 return sock_recvmsg(sock, &msg, size, msg.msg_flags);
731 if (sock->type == SOCK_SEQPACKET)
732 msg.msg_flags |= MSG_EOR;
734 return sock_sendmsg(sock, &msg, size);
737 static ssize_t sock_readv(struct file *file, const struct iovec *vector,
738 unsigned long count, loff_t *ppos)
742 for (i = 0 ; i < count ; i++)
743 tot_len += vector[i].iov_len;
744 return sock_readv_writev(VERIFY_WRITE, file->f_dentry->d_inode,
745 file, vector, count, tot_len);
748 static ssize_t sock_writev(struct file *file, const struct iovec *vector,
749 unsigned long count, loff_t *ppos)
753 for (i = 0 ; i < count ; i++)
754 tot_len += vector[i].iov_len;
755 return sock_readv_writev(VERIFY_READ, file->f_dentry->d_inode,
756 file, vector, count, tot_len);
761 * Atomic setting of ioctl hooks to avoid race
762 * with module unload.
765 static DECLARE_MUTEX(br_ioctl_mutex);
766 static int (*br_ioctl_hook)(unsigned int cmd, unsigned long arg) = NULL;
768 void brioctl_set(int (*hook)(unsigned int, unsigned long))
770 down(&br_ioctl_mutex);
771 br_ioctl_hook = hook;
774 EXPORT_SYMBOL(brioctl_set);
776 static DECLARE_MUTEX(vlan_ioctl_mutex);
777 static int (*vlan_ioctl_hook)(unsigned long arg);
779 void vlan_ioctl_set(int (*hook)(unsigned long))
781 down(&vlan_ioctl_mutex);
782 vlan_ioctl_hook = hook;
783 up(&vlan_ioctl_mutex);
785 EXPORT_SYMBOL(vlan_ioctl_set);
787 static DECLARE_MUTEX(dlci_ioctl_mutex);
788 static int (*dlci_ioctl_hook)(unsigned int, void *);
790 void dlci_ioctl_set(int (*hook)(unsigned int, void *))
792 down(&dlci_ioctl_mutex);
793 dlci_ioctl_hook = hook;
794 up(&dlci_ioctl_mutex);
796 EXPORT_SYMBOL(dlci_ioctl_set);
799 * With an ioctl, arg may well be a user mode pointer, but we don't know
800 * what to do with it - that's up to the protocol still.
803 static int sock_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
810 sock = SOCKET_I(inode);
811 if (cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15)) {
812 err = dev_ioctl(cmd, (void __user *)arg);
815 if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) {
816 err = dev_ioctl(cmd, (void __user *)arg);
818 #endif /* WIRELESS_EXT */
823 if (get_user(pid, (int __user *)arg))
825 err = f_setown(sock->file, pid, 1);
829 err = put_user(sock->file->f_owner.pid, (int __user *)arg);
837 request_module("bridge");
839 down(&br_ioctl_mutex);
841 err = br_ioctl_hook(cmd, arg);
847 if (!vlan_ioctl_hook)
848 request_module("8021q");
850 down(&vlan_ioctl_mutex);
852 err = vlan_ioctl_hook(arg);
853 up(&vlan_ioctl_mutex);
857 /* Convert this to call through a hook */
858 err = divert_ioctl(cmd, (struct divert_cf *)arg);
863 if (!dlci_ioctl_hook)
864 request_module("dlci");
866 if (dlci_ioctl_hook) {
867 down(&dlci_ioctl_mutex);
868 err = dlci_ioctl_hook(cmd, (void *)arg);
869 up(&dlci_ioctl_mutex);
873 err = sock->ops->ioctl(sock, cmd, arg);
881 int sock_create_lite(int family, int type, int protocol, struct socket **res)
884 struct socket *sock = NULL;
886 err = security_socket_create(family, type, protocol, 1);
896 security_socket_post_create(sock, family, type, protocol, 1);
903 /* No kernel lock held - perfect */
904 static unsigned int sock_poll(struct file *file, poll_table * wait)
909 * We can't return errors to poll, so it's either yes or no.
911 sock = SOCKET_I(file->f_dentry->d_inode);
912 return sock->ops->poll(file, sock, wait);
915 static int sock_mmap(struct file * file, struct vm_area_struct * vma)
917 struct socket *sock = SOCKET_I(file->f_dentry->d_inode);
919 return sock->ops->mmap(file, sock, vma);
922 int sock_close(struct inode *inode, struct file *filp)
925 * It was possible the inode is NULL we were
926 * closing an unfinished socket.
931 printk(KERN_DEBUG "sock_close: NULL inode\n");
934 sock_fasync(-1, filp, 0);
935 sock_release(SOCKET_I(inode));
940 * Update the socket async list
942 * Fasync_list locking strategy.
944 * 1. fasync_list is modified only under process context socket lock
945 * i.e. under semaphore.
946 * 2. fasync_list is used under read_lock(&sk->sk_callback_lock)
947 * or under socket lock.
948 * 3. fasync_list can be used from softirq context, so that
949 * modification under socket lock have to be enhanced with
950 * write_lock_bh(&sk->sk_callback_lock).
954 static int sock_fasync(int fd, struct file *filp, int on)
956 struct fasync_struct *fa, *fna=NULL, **prev;
962 fna=(struct fasync_struct *)kmalloc(sizeof(struct fasync_struct), GFP_KERNEL);
967 sock = SOCKET_I(filp->f_dentry->d_inode);
969 if ((sk=sock->sk) == NULL) {
977 prev=&(sock->fasync_list);
979 for (fa=*prev; fa!=NULL; prev=&fa->fa_next,fa=*prev)
980 if (fa->fa_file==filp)
987 write_lock_bh(&sk->sk_callback_lock);
989 write_unlock_bh(&sk->sk_callback_lock);
996 fna->magic=FASYNC_MAGIC;
997 fna->fa_next=sock->fasync_list;
998 write_lock_bh(&sk->sk_callback_lock);
999 sock->fasync_list=fna;
1000 write_unlock_bh(&sk->sk_callback_lock);
1006 write_lock_bh(&sk->sk_callback_lock);
1008 write_unlock_bh(&sk->sk_callback_lock);
1016 release_sock(sock->sk);
1020 /* This function may be called only under socket lock or callback_lock */
1022 int sock_wake_async(struct socket *sock, int how, int band)
1024 if (!sock || !sock->fasync_list)
1030 if (test_bit(SOCK_ASYNC_WAITDATA, &sock->flags))
1034 if (!test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags))
1039 __kill_fasync(sock->fasync_list, SIGIO, band);
1042 __kill_fasync(sock->fasync_list, SIGURG, band);
1047 static int __sock_create(int family, int type, int protocol, struct socket **res, int kern)
1051 struct socket *sock;
1054 * Check protocol is in range
1056 if (family < 0 || family >= NPROTO)
1057 return -EAFNOSUPPORT;
1058 if (type < 0 || type >= SOCK_MAX)
1061 /* disable IPv6 inside vservers for now */
1062 if (family == PF_INET6 && !vx_check(0, VX_ADMIN))
1063 return -EAFNOSUPPORT;
1067 This uglymoron is moved from INET layer to here to avoid
1068 deadlock in module load.
1070 if (family == PF_INET && type == SOCK_PACKET) {
1074 printk(KERN_INFO "%s uses obsolete (PF_INET,SOCK_PACKET)\n", current->comm);
1079 err = security_socket_create(family, type, protocol, kern);
1083 #if defined(CONFIG_KMOD)
1084 /* Attempt to load a protocol module if the find failed.
1086 * 12/09/1996 Marcin: But! this makes REALLY only sense, if the user
1087 * requested real, full-featured networking support upon configuration.
1088 * Otherwise module support will break!
1090 if (net_families[family]==NULL)
1092 request_module("net-pf-%d",family);
1096 net_family_read_lock();
1097 if (net_families[family] == NULL) {
1103 * Allocate the socket and allow the family to set things up. if
1104 * the protocol is 0, the family is instructed to select an appropriate
1108 if (!(sock = sock_alloc()))
1110 printk(KERN_WARNING "socket: no more sockets\n");
1111 i = -ENFILE; /* Not exactly a match, but its the
1112 closest posix thing */
1119 * We will call the ->create function, that possibly is in a loadable
1120 * module, so we have to bump that loadable module refcnt first.
1123 if (!try_module_get(net_families[family]->owner))
1126 if ((i = net_families[family]->create(sock, protocol)) < 0)
1127 goto out_module_put;
1129 * Now to bump the refcnt of the [loadable] module that owns this
1130 * socket at sock_release time we decrement its refcnt.
1132 if (!try_module_get(sock->ops->owner)) {
1134 goto out_module_put;
1137 * Now that we're done with the ->create function, the [loadable]
1138 * module can have its refcnt decremented
1140 module_put(net_families[family]->owner);
1142 security_socket_post_create(sock, family, type, protocol, kern);
1145 net_family_read_unlock();
1148 module_put(net_families[family]->owner);
1154 int sock_create(int family, int type, int protocol, struct socket **res)
1156 return __sock_create(family, type, protocol, res, 0);
1159 int sock_create_kern(int family, int type, int protocol, struct socket **res)
1161 return __sock_create(family, type, protocol, res, 1);
1164 asmlinkage long sys_socket(int family, int type, int protocol)
1167 struct socket *sock;
1169 retval = sock_create(family, type, protocol, &sock);
1173 set_bit(SOCK_USER_SOCKET, &sock->flags);
1174 retval = sock_map_fd(sock);
1179 /* It may be already another descriptor 8) Not kernel problem. */
1188 * Create a pair of connected sockets.
1191 asmlinkage long sys_socketpair(int family, int type, int protocol, int __user *usockvec)
1193 struct socket *sock1, *sock2;
1197 * Obtain the first socket and check if the underlying protocol
1198 * supports the socketpair call.
1201 err = sock_create(family, type, protocol, &sock1);
1204 set_bit(SOCK_USER_SOCKET, &sock1->flags);
1206 err = sock_create(family, type, protocol, &sock2);
1209 set_bit(SOCK_USER_SOCKET, &sock2->flags);
1211 err = sock1->ops->socketpair(sock1, sock2);
1213 goto out_release_both;
1217 err = sock_map_fd(sock1);
1219 goto out_release_both;
1222 err = sock_map_fd(sock2);
1227 /* fd1 and fd2 may be already another descriptors.
1228 * Not kernel problem.
1231 err = put_user(fd1, &usockvec[0]);
1233 err = put_user(fd2, &usockvec[1]);
1242 sock_release(sock2);
1247 sock_release(sock2);
1249 sock_release(sock1);
1256 * Bind a name to a socket. Nothing much to do here since it's
1257 * the protocol's responsibility to handle the local address.
1259 * We move the socket address to kernel space before we call
1260 * the protocol layer (having also checked the address is ok).
1263 asmlinkage long sys_bind(int fd, struct sockaddr __user *umyaddr, int addrlen)
1265 struct socket *sock;
1266 char address[MAX_SOCK_ADDR];
1269 if((sock = sockfd_lookup(fd,&err))!=NULL)
1271 if((err=move_addr_to_kernel(umyaddr,addrlen,address))>=0) {
1272 err = security_socket_bind(sock, (struct sockaddr *)address, addrlen);
1277 err = sock->ops->bind(sock, (struct sockaddr *)address, addrlen);
1286 * Perform a listen. Basically, we allow the protocol to do anything
1287 * necessary for a listen, and if that works, we mark the socket as
1288 * ready for listening.
1291 int sysctl_somaxconn = SOMAXCONN;
1293 asmlinkage long sys_listen(int fd, int backlog)
1295 struct socket *sock;
1298 if ((sock = sockfd_lookup(fd, &err)) != NULL) {
1299 if ((unsigned) backlog > sysctl_somaxconn)
1300 backlog = sysctl_somaxconn;
1302 err = security_socket_listen(sock, backlog);
1308 err=sock->ops->listen(sock, backlog);
1316 * For accept, we attempt to create a new socket, set up the link
1317 * with the client, wake up the client, then return the new
1318 * connected fd. We collect the address of the connector in kernel
1319 * space and move it to user at the very end. This is unclean because
1320 * we open the socket then return an error.
1322 * 1003.1g adds the ability to recvmsg() to query connection pending
1323 * status to recvmsg. We need to add that support in a way thats
1324 * clean when we restucture accept also.
1327 asmlinkage long sys_accept(int fd, struct sockaddr __user *upeer_sockaddr, int __user *upeer_addrlen)
1329 struct socket *sock, *newsock;
1331 char address[MAX_SOCK_ADDR];
1333 sock = sockfd_lookup(fd, &err);
1338 if (!(newsock = sock_alloc()))
1341 newsock->type = sock->type;
1342 newsock->ops = sock->ops;
1344 err = security_socket_accept(sock, newsock);
1349 * We don't need try_module_get here, as the listening socket (sock)
1350 * has the protocol module (sock->ops->owner) held.
1352 __module_get(newsock->ops->owner);
1354 err = sock->ops->accept(sock, newsock, sock->file->f_flags);
1358 if (upeer_sockaddr) {
1359 if(newsock->ops->getname(newsock, (struct sockaddr *)address, &len, 2)<0) {
1360 err = -ECONNABORTED;
1363 err = move_addr_to_user(address, len, upeer_sockaddr, upeer_addrlen);
1368 /* File flags are not inherited via accept() unlike another OSes. */
1370 if ((err = sock_map_fd(newsock)) < 0)
1373 security_socket_post_accept(sock, newsock);
1380 sock_release(newsock);
1386 * Attempt to connect to a socket with the server address. The address
1387 * is in user space so we verify it is OK and move it to kernel space.
1389 * For 1003.1g we need to add clean support for a bind to AF_UNSPEC to
1392 * NOTE: 1003.1g draft 6.3 is broken with respect to AX.25/NetROM and
1393 * other SEQPACKET protocols that take time to connect() as it doesn't
1394 * include the -EINPROGRESS status for such sockets.
1397 asmlinkage long sys_connect(int fd, struct sockaddr __user *uservaddr, int addrlen)
1399 struct socket *sock;
1400 char address[MAX_SOCK_ADDR];
1403 sock = sockfd_lookup(fd, &err);
1406 err = move_addr_to_kernel(uservaddr, addrlen, address);
1410 err = security_socket_connect(sock, (struct sockaddr *)address, addrlen);
1414 err = sock->ops->connect(sock, (struct sockaddr *) address, addrlen,
1415 sock->file->f_flags);
1423 * Get the local address ('name') of a socket object. Move the obtained
1424 * name to user space.
1427 asmlinkage long sys_getsockname(int fd, struct sockaddr __user *usockaddr, int __user *usockaddr_len)
1429 struct socket *sock;
1430 char address[MAX_SOCK_ADDR];
1433 sock = sockfd_lookup(fd, &err);
1437 err = security_socket_getsockname(sock);
1441 err = sock->ops->getname(sock, (struct sockaddr *)address, &len, 0);
1444 err = move_addr_to_user(address, len, usockaddr, usockaddr_len);
1453 * Get the remote address ('name') of a socket object. Move the obtained
1454 * name to user space.
1457 asmlinkage long sys_getpeername(int fd, struct sockaddr __user *usockaddr, int __user *usockaddr_len)
1459 struct socket *sock;
1460 char address[MAX_SOCK_ADDR];
1463 if ((sock = sockfd_lookup(fd, &err))!=NULL)
1465 err = security_socket_getpeername(sock);
1471 err = sock->ops->getname(sock, (struct sockaddr *)address, &len, 1);
1473 err=move_addr_to_user(address,len, usockaddr, usockaddr_len);
1480 * Send a datagram to a given address. We move the address into kernel
1481 * space and check the user space data area is readable before invoking
1485 asmlinkage long sys_sendto(int fd, void __user * buff, size_t len, unsigned flags,
1486 struct sockaddr __user *addr, int addr_len)
1488 struct socket *sock;
1489 char address[MAX_SOCK_ADDR];
1494 sock = sockfd_lookup(fd, &err);
1502 msg.msg_control=NULL;
1503 msg.msg_controllen=0;
1507 err = move_addr_to_kernel(addr, addr_len, address);
1510 msg.msg_name=address;
1511 msg.msg_namelen=addr_len;
1513 if (sock->file->f_flags & O_NONBLOCK)
1514 flags |= MSG_DONTWAIT;
1515 msg.msg_flags = flags;
1516 err = sock_sendmsg(sock, &msg, len);
1525 * Send a datagram down a socket.
1528 asmlinkage long sys_send(int fd, void __user * buff, size_t len, unsigned flags)
1530 return sys_sendto(fd, buff, len, flags, NULL, 0);
1534 * Receive a frame from the socket and optionally record the address of the
1535 * sender. We verify the buffers are writable and if needed move the
1536 * sender address from kernel to user space.
1539 asmlinkage long sys_recvfrom(int fd, void __user * ubuf, size_t size, unsigned flags,
1540 struct sockaddr __user *addr, int __user *addr_len)
1542 struct socket *sock;
1545 char address[MAX_SOCK_ADDR];
1548 sock = sockfd_lookup(fd, &err);
1552 msg.msg_control=NULL;
1553 msg.msg_controllen=0;
1558 msg.msg_name=address;
1559 msg.msg_namelen=MAX_SOCK_ADDR;
1560 if (sock->file->f_flags & O_NONBLOCK)
1561 flags |= MSG_DONTWAIT;
1562 err=sock_recvmsg(sock, &msg, size, flags);
1564 if(err >= 0 && addr != NULL)
1566 err2=move_addr_to_user(address, msg.msg_namelen, addr, addr_len);
1576 * Receive a datagram from a socket.
1579 asmlinkage long sys_recv(int fd, void __user * ubuf, size_t size, unsigned flags)
1581 return sys_recvfrom(fd, ubuf, size, flags, NULL, NULL);
1585 * Set a socket option. Because we don't know the option lengths we have
1586 * to pass the user mode parameter for the protocols to sort out.
1589 asmlinkage long sys_setsockopt(int fd, int level, int optname, char __user *optval, int optlen)
1592 struct socket *sock;
1597 if ((sock = sockfd_lookup(fd, &err))!=NULL)
1599 err = security_socket_setsockopt(sock,level,optname);
1605 if (level == SOL_SOCKET)
1606 err=sock_setsockopt(sock,level,optname,optval,optlen);
1608 err=sock->ops->setsockopt(sock, level, optname, optval, optlen);
1615 * Get a socket option. Because we don't know the option lengths we have
1616 * to pass a user mode parameter for the protocols to sort out.
1619 asmlinkage long sys_getsockopt(int fd, int level, int optname, char __user *optval, int __user *optlen)
1622 struct socket *sock;
1624 if ((sock = sockfd_lookup(fd, &err))!=NULL)
1626 err = security_socket_getsockopt(sock, level,
1633 if (level == SOL_SOCKET)
1634 err=sock_getsockopt(sock,level,optname,optval,optlen);
1636 err=sock->ops->getsockopt(sock, level, optname, optval, optlen);
1644 * Shutdown a socket.
1647 asmlinkage long sys_shutdown(int fd, int how)
1650 struct socket *sock;
1652 if ((sock = sockfd_lookup(fd, &err))!=NULL)
1654 err = security_socket_shutdown(sock, how);
1660 err=sock->ops->shutdown(sock, how);
1666 /* A couple of helpful macros for getting the address of the 32/64 bit
1667 * fields which are the same type (int / unsigned) on our platforms.
1669 #define COMPAT_MSG(msg, member) ((MSG_CMSG_COMPAT & flags) ? &msg##_compat->member : &msg->member)
1670 #define COMPAT_NAMELEN(msg) COMPAT_MSG(msg, msg_namelen)
1671 #define COMPAT_FLAGS(msg) COMPAT_MSG(msg, msg_flags)
1675 * BSD sendmsg interface
1678 asmlinkage long sys_sendmsg(int fd, struct msghdr __user *msg, unsigned flags)
1680 struct compat_msghdr __user *msg_compat = (struct compat_msghdr __user *)msg;
1681 struct socket *sock;
1682 char address[MAX_SOCK_ADDR];
1683 struct iovec iovstack[UIO_FASTIOV], *iov = iovstack;
1684 unsigned char ctl[sizeof(struct cmsghdr) + 20]; /* 20 is size of ipv6_pktinfo */
1685 unsigned char *ctl_buf = ctl;
1686 struct msghdr msg_sys;
1687 int err, ctl_len, iov_size, total_len;
1690 if (MSG_CMSG_COMPAT & flags) {
1691 if (get_compat_msghdr(&msg_sys, msg_compat))
1693 } else if (copy_from_user(&msg_sys, msg, sizeof(struct msghdr)))
1696 sock = sockfd_lookup(fd, &err);
1700 /* do not move before msg_sys is valid */
1702 if (msg_sys.msg_iovlen > UIO_MAXIOV)
1705 /* Check whether to allocate the iovec area*/
1707 iov_size = msg_sys.msg_iovlen * sizeof(struct iovec);
1708 if (msg_sys.msg_iovlen > UIO_FASTIOV) {
1709 iov = sock_kmalloc(sock->sk, iov_size, GFP_KERNEL);
1714 /* This will also move the address data into kernel space */
1715 if (MSG_CMSG_COMPAT & flags) {
1716 err = verify_compat_iovec(&msg_sys, iov, address, VERIFY_READ);
1718 err = verify_iovec(&msg_sys, iov, address, VERIFY_READ);
1725 if (msg_sys.msg_controllen > INT_MAX)
1727 ctl_len = msg_sys.msg_controllen;
1728 if ((MSG_CMSG_COMPAT & flags) && ctl_len) {
1729 err = cmsghdr_from_user_compat_to_kern(&msg_sys, ctl, sizeof(ctl));
1732 ctl_buf = msg_sys.msg_control;
1733 } else if (ctl_len) {
1734 if (ctl_len > sizeof(ctl))
1736 ctl_buf = sock_kmalloc(sock->sk, ctl_len, GFP_KERNEL);
1737 if (ctl_buf == NULL)
1742 * Careful! Before this, msg_sys.msg_control contains a user pointer.
1743 * Afterwards, it will be a kernel pointer. Thus the compiler-assisted
1744 * checking falls down on this.
1746 if (copy_from_user(ctl_buf, (void __user *) msg_sys.msg_control, ctl_len))
1748 msg_sys.msg_control = ctl_buf;
1750 msg_sys.msg_flags = flags;
1752 if (sock->file->f_flags & O_NONBLOCK)
1753 msg_sys.msg_flags |= MSG_DONTWAIT;
1754 err = sock_sendmsg(sock, &msg_sys, total_len);
1758 sock_kfree_s(sock->sk, ctl_buf, ctl_len);
1760 if (iov != iovstack)
1761 sock_kfree_s(sock->sk, iov, iov_size);
1769 * BSD recvmsg interface
1772 asmlinkage long sys_recvmsg(int fd, struct msghdr __user *msg, unsigned int flags)
1774 struct compat_msghdr __user *msg_compat = (struct compat_msghdr __user *)msg;
1775 struct socket *sock;
1776 struct iovec iovstack[UIO_FASTIOV];
1777 struct iovec *iov=iovstack;
1778 struct msghdr msg_sys;
1779 unsigned long cmsg_ptr;
1780 int err, iov_size, total_len, len;
1782 /* kernel mode address */
1783 char addr[MAX_SOCK_ADDR];
1785 /* user mode address pointers */
1786 struct sockaddr __user *uaddr;
1787 int __user *uaddr_len;
1789 if (MSG_CMSG_COMPAT & flags) {
1790 if (get_compat_msghdr(&msg_sys, msg_compat))
1793 if (copy_from_user(&msg_sys,msg,sizeof(struct msghdr)))
1796 sock = sockfd_lookup(fd, &err);
1801 if (msg_sys.msg_iovlen > UIO_MAXIOV)
1804 /* Check whether to allocate the iovec area*/
1806 iov_size = msg_sys.msg_iovlen * sizeof(struct iovec);
1807 if (msg_sys.msg_iovlen > UIO_FASTIOV) {
1808 iov = sock_kmalloc(sock->sk, iov_size, GFP_KERNEL);
1814 * Save the user-mode address (verify_iovec will change the
1815 * kernel msghdr to use the kernel address space)
1818 uaddr = (void __user *) msg_sys.msg_name;
1819 uaddr_len = COMPAT_NAMELEN(msg);
1820 if (MSG_CMSG_COMPAT & flags) {
1821 err = verify_compat_iovec(&msg_sys, iov, addr, VERIFY_WRITE);
1823 err = verify_iovec(&msg_sys, iov, addr, VERIFY_WRITE);
1828 cmsg_ptr = (unsigned long)msg_sys.msg_control;
1829 msg_sys.msg_flags = 0;
1830 if (MSG_CMSG_COMPAT & flags)
1831 msg_sys.msg_flags = MSG_CMSG_COMPAT;
1833 if (sock->file->f_flags & O_NONBLOCK)
1834 flags |= MSG_DONTWAIT;
1835 err = sock_recvmsg(sock, &msg_sys, total_len, flags);
1840 if (uaddr != NULL) {
1841 err = move_addr_to_user(addr, msg_sys.msg_namelen, uaddr, uaddr_len);
1845 err = __put_user(msg_sys.msg_flags, COMPAT_FLAGS(msg));
1848 if (MSG_CMSG_COMPAT & flags)
1849 err = __put_user((unsigned long)msg_sys.msg_control-cmsg_ptr,
1850 &msg_compat->msg_controllen);
1852 err = __put_user((unsigned long)msg_sys.msg_control-cmsg_ptr,
1853 &msg->msg_controllen);
1859 if (iov != iovstack)
1860 sock_kfree_s(sock->sk, iov, iov_size);
1867 #ifdef __ARCH_WANT_SYS_SOCKETCALL
1869 /* Argument list sizes for sys_socketcall */
1870 #define AL(x) ((x) * sizeof(unsigned long))
1871 static unsigned char nargs[18]={AL(0),AL(3),AL(3),AL(3),AL(2),AL(3),
1872 AL(3),AL(3),AL(4),AL(4),AL(4),AL(6),
1873 AL(6),AL(2),AL(5),AL(5),AL(3),AL(3)};
1877 * System call vectors.
1879 * Argument checking cleaned up. Saved 20% in size.
1880 * This function doesn't need to set the kernel lock because
1881 * it is set by the callees.
1884 asmlinkage long sys_socketcall(int call, unsigned long __user *args)
1887 unsigned long a0,a1;
1890 if(call<1||call>SYS_RECVMSG)
1893 /* copy_from_user should be SMP safe. */
1894 if (copy_from_user(a, args, nargs[call]))
1903 err = sys_socket(a0,a1,a[2]);
1906 err = sys_bind(a0,(struct sockaddr __user *)a1, a[2]);
1909 err = sys_connect(a0, (struct sockaddr __user *)a1, a[2]);
1912 err = sys_listen(a0,a1);
1915 err = sys_accept(a0,(struct sockaddr __user *)a1, (int __user *)a[2]);
1917 case SYS_GETSOCKNAME:
1918 err = sys_getsockname(a0,(struct sockaddr __user *)a1, (int __user *)a[2]);
1920 case SYS_GETPEERNAME:
1921 err = sys_getpeername(a0, (struct sockaddr __user *)a1, (int __user *)a[2]);
1923 case SYS_SOCKETPAIR:
1924 err = sys_socketpair(a0,a1, a[2], (int __user *)a[3]);
1927 err = sys_send(a0, (void __user *)a1, a[2], a[3]);
1930 err = sys_sendto(a0,(void __user *)a1, a[2], a[3],
1931 (struct sockaddr __user *)a[4], a[5]);
1934 err = sys_recv(a0, (void __user *)a1, a[2], a[3]);
1937 err = sys_recvfrom(a0, (void __user *)a1, a[2], a[3],
1938 (struct sockaddr __user *)a[4], (int __user *)a[5]);
1941 err = sys_shutdown(a0,a1);
1943 case SYS_SETSOCKOPT:
1944 err = sys_setsockopt(a0, a1, a[2], (char __user *)a[3], a[4]);
1946 case SYS_GETSOCKOPT:
1947 err = sys_getsockopt(a0, a1, a[2], (char __user *)a[3], (int __user *)a[4]);
1950 err = sys_sendmsg(a0, (struct msghdr __user *) a1, a[2]);
1953 err = sys_recvmsg(a0, (struct msghdr __user *) a1, a[2]);
1962 #endif /* __ARCH_WANT_SYS_SOCKETCALL */
1965 * This function is called by a protocol handler that wants to
1966 * advertise its address family, and have it linked into the
1970 int sock_register(struct net_proto_family *ops)
1974 if (ops->family >= NPROTO) {
1975 printk(KERN_CRIT "protocol %d >= NPROTO(%d)\n", ops->family, NPROTO);
1978 net_family_write_lock();
1980 if (net_families[ops->family] == NULL) {
1981 net_families[ops->family]=ops;
1984 net_family_write_unlock();
1985 printk(KERN_INFO "NET: Registered protocol family %d\n",
1991 * This function is called by a protocol handler that wants to
1992 * remove its address family, and have it unlinked from the
1996 int sock_unregister(int family)
1998 if (family < 0 || family >= NPROTO)
2001 net_family_write_lock();
2002 net_families[family]=NULL;
2003 net_family_write_unlock();
2004 printk(KERN_INFO "NET: Unregistered protocol family %d\n",
2010 extern void sk_init(void);
2012 void __init sock_init(void)
2017 * Initialize all address (protocol) families.
2020 for (i = 0; i < NPROTO; i++)
2021 net_families[i] = NULL;
2024 * Initialize sock SLAB cache.
2031 * Initialize skbuff SLAB cache
2037 * Initialize the protocols module.
2041 register_filesystem(&sock_fs_type);
2042 sock_mnt = kern_mount(&sock_fs_type);
2043 /* The real protocol initialization is performed when
2044 * do_initcalls is run.
2047 #ifdef CONFIG_NETFILTER
2055 #ifdef CONFIG_TUX_MODULE
2057 asmlinkage long (*sys_tux_ptr) (unsigned int action, user_req_t *u_info) = NULL;
2059 struct module *tux_module = NULL;
2060 spinlock_t tux_module_lock = SPIN_LOCK_UNLOCKED;
2062 asmlinkage long sys_tux (unsigned int action, user_req_t *u_info)
2066 if (current->tux_info)
2067 return sys_tux_ptr(action, u_info);
2070 spin_lock(&tux_module_lock);
2073 if (!try_module_get(tux_module))
2075 spin_unlock(&tux_module_lock);
2079 ret = sys_tux_ptr(action, u_info);
2081 spin_lock(&tux_module_lock);
2082 module_put(tux_module);
2084 spin_unlock(&tux_module_lock);
2089 EXPORT_SYMBOL_GPL(tux_module);
2090 EXPORT_SYMBOL_GPL(tux_module_lock);
2091 EXPORT_SYMBOL_GPL(sys_tux_ptr);
2093 EXPORT_SYMBOL_GPL(tux_Dprintk);
2094 EXPORT_SYMBOL_GPL(tux_TDprintk);
2097 #ifdef CONFIG_PROC_FS
2098 void socket_seq_show(struct seq_file *seq)
2103 for (cpu = 0; cpu < NR_CPUS; cpu++)
2104 counter += per_cpu(sockets_in_use, cpu);
2106 /* It can be negative, by the way. 8) */
2110 seq_printf(seq, "sockets: used %d\n", counter);
2112 #endif /* CONFIG_PROC_FS */
2114 /* ABI emulation layers need these two */
2115 EXPORT_SYMBOL(move_addr_to_kernel);
2116 EXPORT_SYMBOL(move_addr_to_user);
2117 EXPORT_SYMBOL(sock_alloc);
2118 EXPORT_SYMBOL(sock_alloc_inode);
2119 EXPORT_SYMBOL(sock_create);
2120 EXPORT_SYMBOL(sock_create_kern);
2121 EXPORT_SYMBOL(sock_create_lite);
2122 EXPORT_SYMBOL(sock_map_fd);
2123 EXPORT_SYMBOL(sock_recvmsg);
2124 EXPORT_SYMBOL(sock_register);
2125 EXPORT_SYMBOL(sock_release);
2126 EXPORT_SYMBOL(sock_sendmsg);
2127 EXPORT_SYMBOL(sock_unregister);
2128 EXPORT_SYMBOL(sock_wake_async);
2129 EXPORT_SYMBOL(sockfd_lookup);