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
60 #include <linux/config.h>
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/wanrouter.h>
70 #include <linux/netlink.h>
71 #include <linux/rtnetlink.h>
72 #include <linux/init.h>
73 #include <linux/poll.h>
74 #include <linux/cache.h>
75 #include <linux/module.h>
76 #include <linux/highmem.h>
78 #if defined(CONFIG_KMOD) && defined(CONFIG_NET)
79 #include <linux/kmod.h>
82 #include <asm/uaccess.h>
86 #include <linux/netfilter.h>
88 static int sock_no_open(struct inode *irrelevant, struct file *dontcare);
89 static ssize_t sock_read(struct file *file, char *buf,
90 size_t size, loff_t *ppos);
91 static ssize_t sock_write(struct file *file, const char *buf,
92 size_t size, loff_t *ppos);
93 static int sock_mmap(struct file *file, struct vm_area_struct * vma);
95 static int sock_close(struct inode *inode, struct file *file);
96 static unsigned int sock_poll(struct file *file,
97 struct poll_table_struct *wait);
98 static int sock_ioctl(struct inode *inode, struct file *file,
99 unsigned int cmd, unsigned long arg);
100 static int sock_fasync(int fd, struct file *filp, int on);
101 static ssize_t sock_readv(struct file *file, const struct iovec *vector,
102 unsigned long count, loff_t *ppos);
103 static ssize_t sock_writev(struct file *file, const struct iovec *vector,
104 unsigned long count, loff_t *ppos);
105 static ssize_t sock_sendpage(struct file *file, struct page *page,
106 int offset, size_t size, loff_t *ppos, int more);
110 * Socket files have a set of 'special' operations as well as the generic file ones. These don't appear
111 * in the operation structures but are done directly via the socketcall() multiplexor.
114 static struct file_operations socket_file_ops = {
121 open: sock_no_open, /* special open code to disallow open via /proc */
126 sendpage: sock_sendpage
130 * The protocol list. Each protocol is registered in here.
133 static struct net_proto_family *net_families[NPROTO];
136 static atomic_t net_family_lockct = ATOMIC_INIT(0);
137 static spinlock_t net_family_lock = SPIN_LOCK_UNLOCKED;
139 /* The strategy is: modifications net_family vector are short, do not
140 sleep and veeery rare, but read access should be free of any exclusive
144 static void net_family_write_lock(void)
146 spin_lock(&net_family_lock);
147 while (atomic_read(&net_family_lockct) != 0) {
148 spin_unlock(&net_family_lock);
152 spin_lock(&net_family_lock);
156 static __inline__ void net_family_write_unlock(void)
158 spin_unlock(&net_family_lock);
161 static __inline__ void net_family_read_lock(void)
163 atomic_inc(&net_family_lockct);
164 spin_unlock_wait(&net_family_lock);
167 static __inline__ void net_family_read_unlock(void)
169 atomic_dec(&net_family_lockct);
173 #define net_family_write_lock() do { } while(0)
174 #define net_family_write_unlock() do { } while(0)
175 #define net_family_read_lock() do { } while(0)
176 #define net_family_read_unlock() do { } while(0)
181 * Statistics counters of the socket lists
186 char __pad[SMP_CACHE_BYTES];
187 } sockets_in_use[NR_CPUS] __cacheline_aligned = {{0}};
190 * Support routines. Move socket addresses back and forth across the kernel/user
191 * divide and look after the messy bits.
194 #define MAX_SOCK_ADDR 128 /* 108 for Unix domain -
195 16 for IP, 16 for IPX,
198 must be at least one bigger than
199 the AF_UNIX size (see net/unix/af_unix.c
204 * move_addr_to_kernel - copy a socket address into kernel space
205 * @uaddr: Address in user space
206 * @kaddr: Address in kernel space
207 * @ulen: Length in user space
209 * The address is copied into kernel space. If the provided address is
210 * too long an error code of -EINVAL is returned. If the copy gives
211 * invalid addresses -EFAULT is returned. On a success 0 is returned.
214 int move_addr_to_kernel(void *uaddr, int ulen, void *kaddr)
216 if(ulen<0||ulen>MAX_SOCK_ADDR)
220 if(copy_from_user(kaddr,uaddr,ulen))
226 * move_addr_to_user - copy an address to user space
227 * @kaddr: kernel space address
228 * @klen: length of address in kernel
229 * @uaddr: user space address
230 * @ulen: pointer to user length field
232 * The value pointed to by ulen on entry is the buffer length available.
233 * This is overwritten with the buffer space used. -EINVAL is returned
234 * if an overlong buffer is specified or a negative buffer size. -EFAULT
235 * is returned if either the buffer or the length field are not
237 * After copying the data up to the limit the user specifies, the true
238 * length of the data is written over the length limit the user
239 * specified. Zero is returned for a success.
242 int move_addr_to_user(void *kaddr, int klen, void *uaddr, int *ulen)
247 if((err=get_user(len, ulen)))
251 if(len<0 || len> MAX_SOCK_ADDR)
255 if(copy_to_user(uaddr,kaddr,len))
259 * "fromlen shall refer to the value before truncation.."
262 return __put_user(klen, ulen);
265 #define SOCKFS_MAGIC 0x534F434B
266 static int sockfs_statfs(struct super_block *sb, struct statfs *buf)
268 buf->f_type = SOCKFS_MAGIC;
270 buf->f_namelen = 255;
274 static struct super_operations sockfs_ops = {
275 statfs: sockfs_statfs,
278 static struct super_block * sockfs_read_super(struct super_block *sb, void *data, int silent)
280 struct inode *root = new_inode(sb);
283 root->i_mode = S_IFDIR | S_IRUSR | S_IWUSR;
284 root->i_uid = root->i_gid = 0;
285 root->i_atime = root->i_mtime = root->i_ctime = CURRENT_TIME;
286 sb->s_blocksize = 1024;
287 sb->s_blocksize_bits = 10;
288 sb->s_magic = SOCKFS_MAGIC;
289 sb->s_op = &sockfs_ops;
290 sb->s_root = d_alloc(NULL, &(const struct qstr) { "socket:", 7, 0 });
295 sb->s_root->d_sb = sb;
296 sb->s_root->d_parent = sb->s_root;
297 d_instantiate(sb->s_root, root);
301 static struct vfsmount *sock_mnt;
302 static DECLARE_FSTYPE(sock_fs_type, "sockfs", sockfs_read_super, FS_NOMOUNT);
303 static int sockfs_delete_dentry(struct dentry *dentry)
307 static struct dentry_operations sockfs_dentry_operations = {
308 d_delete: sockfs_delete_dentry,
312 * Obtains the first available file descriptor and sets it up for use.
314 * This functions creates file structure and maps it to fd space
315 * of current process. On success it returns file descriptor
316 * and file struct implicitly stored in sock->file.
317 * Note that another thread may close file descriptor before we return
318 * from this function. We use the fact that now we do not refer
319 * to socket after mapping. If one day we will need it, this
320 * function will inincrement ref. count on file by 1.
322 * In any case returned fd MAY BE not valid!
323 * This race condition is inavoidable
324 * with shared fd spaces, we cannot solve is inside kernel,
325 * but we take care of internal coherence yet.
328 static int sock_map_fd(struct socket *sock)
335 * Find a file descriptor suitable for return to the user.
338 fd = get_unused_fd();
340 struct file *file = get_empty_filp();
348 sprintf(name, "[%lu]", sock->inode->i_ino);
350 this.len = strlen(name);
351 this.hash = sock->inode->i_ino;
353 file->f_dentry = d_alloc(sock_mnt->mnt_sb->s_root, &this);
354 if (!file->f_dentry) {
360 file->f_dentry->d_op = &sockfs_dentry_operations;
361 d_add(file->f_dentry, sock->inode);
362 file->f_vfsmnt = mntget(sock_mnt);
365 file->f_op = sock->inode->i_fop = &socket_file_ops;
367 file->f_flags = O_RDWR;
369 fd_install(fd, file);
376 extern __inline__ struct socket *socki_lookup(struct inode *inode)
378 return &inode->u.socket_i;
382 * sockfd_lookup - Go from a file number to its socket slot
384 * @err: pointer to an error code return
386 * The file handle passed in is locked and the socket it is bound
387 * too is returned. If an error occurs the err pointer is overwritten
388 * with a negative errno code and NULL is returned. The function checks
389 * for both invalid handles and passing a handle which is not a socket.
391 * On a success the socket object pointer is returned.
394 struct socket *sockfd_lookup(int fd, int *err)
400 if (!(file = fget(fd)))
406 inode = file->f_dentry->d_inode;
407 if (!inode->i_sock || !(sock = socki_lookup(inode)))
414 if (sock->file != file) {
415 printk(KERN_ERR "socki_lookup: socket file changed!\n");
421 extern __inline__ void sockfd_put(struct socket *sock)
427 * sock_alloc - allocate a socket
429 * Allocate a new inode and socket object. The two are bound together
430 * and initialised. The socket is then returned. If we are out of inodes
434 struct socket *sock_alloc(void)
436 struct inode * inode;
437 struct socket * sock;
439 inode = new_inode(sock_mnt->mnt_sb);
443 inode->i_dev = NODEV;
444 sock = socki_lookup(inode);
446 inode->i_mode = S_IFSOCK|S_IRWXUGO;
448 inode->i_uid = current->fsuid;
449 inode->i_gid = current->fsgid;
452 init_waitqueue_head(&sock->wait);
453 sock->fasync_list = NULL;
454 sock->state = SS_UNCONNECTED;
460 sockets_in_use[smp_processor_id()].counter++;
465 * In theory you can't get an open on this inode, but /proc provides
466 * a back door. Remember to keep it shut otherwise you'll let the
467 * creepy crawlies in.
470 static int sock_no_open(struct inode *irrelevant, struct file *dontcare)
476 * sock_release - close a socket
477 * @sock: socket to close
479 * The socket is released from the protocol stack if it has a release
480 * callback, and the inode is then released if the socket is bound to
481 * an inode not a file.
484 void sock_release(struct socket *sock)
487 sock->ops->release(sock);
489 if (sock->fasync_list)
490 printk(KERN_ERR "sock_release: fasync list not empty!\n");
492 sockets_in_use[smp_processor_id()].counter--;
500 int sock_sendmsg(struct socket *sock, struct msghdr *msg, int size)
503 struct scm_cookie scm;
505 err = scm_send(sock, msg, &scm);
507 err = sock->ops->sendmsg(sock, msg, size, &scm);
513 int sock_recvmsg(struct socket *sock, struct msghdr *msg, int size, int flags)
515 struct scm_cookie scm;
517 memset(&scm, 0, sizeof(scm));
519 size = sock->ops->recvmsg(sock, msg, size, flags, &scm);
521 scm_recv(sock, msg, &scm, flags);
528 * Read data from a socket. ubuf is a user mode pointer. We make sure the user
529 * area ubuf...ubuf+size-1 is writable before asking the protocol.
532 static ssize_t sock_read(struct file *file, char *ubuf,
533 size_t size, loff_t *ppos)
540 if (ppos != &file->f_pos)
542 if (size==0) /* Match SYS5 behaviour */
545 sock = socki_lookup(file->f_dentry->d_inode);
551 msg.msg_control=NULL;
552 msg.msg_controllen=0;
555 flags = !(file->f_flags & O_NONBLOCK) ? 0 : MSG_DONTWAIT;
557 return sock_recvmsg(sock, &msg, size, flags);
562 * Write data to a socket. We verify that the user area ubuf..ubuf+size-1
563 * is readable by the user process.
566 static ssize_t sock_write(struct file *file, const char *ubuf,
567 size_t size, loff_t *ppos)
573 if (ppos != &file->f_pos)
575 if(size==0) /* Match SYS5 behaviour */
578 sock = socki_lookup(file->f_dentry->d_inode);
584 msg.msg_control=NULL;
585 msg.msg_controllen=0;
586 msg.msg_flags=!(file->f_flags & O_NONBLOCK) ? 0 : MSG_DONTWAIT;
587 if (sock->type == SOCK_SEQPACKET)
588 msg.msg_flags |= MSG_EOR;
589 iov.iov_base=(void *)ubuf;
592 return sock_sendmsg(sock, &msg, size);
595 ssize_t sock_sendpage(struct file *file, struct page *page,
596 int offset, size_t size, loff_t *ppos, int more)
601 if (ppos != &file->f_pos)
604 sock = socki_lookup(file->f_dentry->d_inode);
606 flags = !(file->f_flags & O_NONBLOCK) ? 0 : MSG_DONTWAIT;
610 return sock->ops->sendpage(sock, page, offset, size, flags);
613 int sock_readv_writev(int type, struct inode * inode, struct file * file,
614 const struct iovec * iov, long count, long size)
619 sock = socki_lookup(inode);
623 msg.msg_control = NULL;
624 msg.msg_controllen = 0;
625 msg.msg_iov = (struct iovec *) iov;
626 msg.msg_iovlen = count;
627 msg.msg_flags = (file->f_flags & O_NONBLOCK) ? MSG_DONTWAIT : 0;
629 /* read() does a VERIFY_WRITE */
630 if (type == VERIFY_WRITE)
631 return sock_recvmsg(sock, &msg, size, msg.msg_flags);
633 if (sock->type == SOCK_SEQPACKET)
634 msg.msg_flags |= MSG_EOR;
636 return sock_sendmsg(sock, &msg, size);
639 static ssize_t sock_readv(struct file *file, const struct iovec *vector,
640 unsigned long count, loff_t *ppos)
644 for (i = 0 ; i < count ; i++)
645 tot_len += vector[i].iov_len;
646 return sock_readv_writev(VERIFY_WRITE, file->f_dentry->d_inode,
647 file, vector, count, tot_len);
650 static ssize_t sock_writev(struct file *file, const struct iovec *vector,
651 unsigned long count, loff_t *ppos)
655 for (i = 0 ; i < count ; i++)
656 tot_len += vector[i].iov_len;
657 return sock_readv_writev(VERIFY_READ, file->f_dentry->d_inode,
658 file, vector, count, tot_len);
662 * With an ioctl arg may well be a user mode pointer, but we don't know what to do
663 * with it - that's up to the protocol still.
666 int sock_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
673 sock = socki_lookup(inode);
674 err = sock->ops->ioctl(sock, cmd, arg);
681 /* No kernel lock held - perfect */
682 static unsigned int sock_poll(struct file *file, poll_table * wait)
687 * We can't return errors to poll, so it's either yes or no.
689 sock = socki_lookup(file->f_dentry->d_inode);
690 return sock->ops->poll(file, sock, wait);
693 static int sock_mmap(struct file * file, struct vm_area_struct * vma)
695 struct socket *sock = socki_lookup(file->f_dentry->d_inode);
697 return sock->ops->mmap(file, sock, vma);
700 int sock_close(struct inode *inode, struct file *filp)
703 * It was possible the inode is NULL we were
704 * closing an unfinished socket.
709 printk(KERN_DEBUG "sock_close: NULL inode\n");
712 sock_fasync(-1, filp, 0);
713 sock_release(socki_lookup(inode));
718 * Update the socket async list
720 * Fasync_list locking strategy.
722 * 1. fasync_list is modified only under process context socket lock
723 * i.e. under semaphore.
724 * 2. fasync_list is used under read_lock(&sk->callback_lock)
725 * or under socket lock.
726 * 3. fasync_list can be used from softirq context, so that
727 * modification under socket lock have to be enhanced with
728 * write_lock_bh(&sk->callback_lock).
732 static int sock_fasync(int fd, struct file *filp, int on)
734 struct fasync_struct *fa, *fna=NULL, **prev;
740 fna=(struct fasync_struct *)kmalloc(sizeof(struct fasync_struct), GFP_KERNEL);
745 sock = socki_lookup(filp->f_dentry->d_inode);
747 if ((sk=sock->sk) == NULL) {
755 prev=&(sock->fasync_list);
757 for (fa=*prev; fa!=NULL; prev=&fa->fa_next,fa=*prev)
758 if (fa->fa_file==filp)
765 write_lock_bh(&sk->callback_lock);
767 write_unlock_bh(&sk->callback_lock);
774 fna->magic=FASYNC_MAGIC;
775 fna->fa_next=sock->fasync_list;
776 write_lock_bh(&sk->callback_lock);
777 sock->fasync_list=fna;
778 write_unlock_bh(&sk->callback_lock);
784 write_lock_bh(&sk->callback_lock);
786 write_unlock_bh(&sk->callback_lock);
792 release_sock(sock->sk);
796 /* This function may be called only under socket lock or callback_lock */
798 int sock_wake_async(struct socket *sock, int how, int band)
800 if (!sock || !sock->fasync_list)
806 if (test_bit(SOCK_ASYNC_WAITDATA, &sock->flags))
810 if (!test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags))
815 __kill_fasync(sock->fasync_list, SIGIO, band);
818 __kill_fasync(sock->fasync_list, SIGURG, band);
824 int sock_create(int family, int type, int protocol, struct socket **res)
830 * Check protocol is in range
832 if (family < 0 || family >= NPROTO)
833 return -EAFNOSUPPORT;
834 if (type < 0 || type >= SOCK_MAX)
839 This uglymoron is moved from INET layer to here to avoid
840 deadlock in module load.
842 if (family == PF_INET && type == SOCK_PACKET) {
846 printk(KERN_INFO "%s uses obsolete (PF_INET,SOCK_PACKET)\n", current->comm);
851 #if defined(CONFIG_KMOD) && defined(CONFIG_NET)
852 /* Attempt to load a protocol module if the find failed.
854 * 12/09/1996 Marcin: But! this makes REALLY only sense, if the user
855 * requested real, full-featured networking support upon configuration.
856 * Otherwise module support will break!
858 if (net_families[family]==NULL)
860 char module_name[30];
861 sprintf(module_name,"net-pf-%d",family);
862 request_module(module_name);
866 net_family_read_lock();
867 if (net_families[family] == NULL) {
873 * Allocate the socket and allow the family to set things up. if
874 * the protocol is 0, the family is instructed to select an appropriate
878 if (!(sock = sock_alloc()))
880 printk(KERN_WARNING "socket: no more sockets\n");
881 i = -ENFILE; /* Not exactly a match, but its the
882 closest posix thing */
888 if ((i = net_families[family]->create(sock, protocol)) < 0)
897 net_family_read_unlock();
901 asmlinkage long sys_socket(int family, int type, int protocol)
906 retval = sock_create(family, type, protocol, &sock);
910 retval = sock_map_fd(sock);
915 /* It may be already another descriptor 8) Not kernel problem. */
924 * Create a pair of connected sockets.
927 asmlinkage long sys_socketpair(int family, int type, int protocol, int usockvec[2])
929 struct socket *sock1, *sock2;
933 * Obtain the first socket and check if the underlying protocol
934 * supports the socketpair call.
937 err = sock_create(family, type, protocol, &sock1);
941 err = sock_create(family, type, protocol, &sock2);
945 err = sock1->ops->socketpair(sock1, sock2);
947 goto out_release_both;
951 err = sock_map_fd(sock1);
953 goto out_release_both;
956 err = sock_map_fd(sock2);
961 /* fd1 and fd2 may be already another descriptors.
962 * Not kernel problem.
965 err = put_user(fd1, &usockvec[0]);
967 err = put_user(fd2, &usockvec[1]);
990 * Bind a name to a socket. Nothing much to do here since it's
991 * the protocol's responsibility to handle the local address.
993 * We move the socket address to kernel space before we call
994 * the protocol layer (having also checked the address is ok).
997 asmlinkage long sys_bind(int fd, struct sockaddr *umyaddr, int addrlen)
1000 char address[MAX_SOCK_ADDR];
1003 if((sock = sockfd_lookup(fd,&err))!=NULL)
1005 if((err=move_addr_to_kernel(umyaddr,addrlen,address))>=0)
1006 err = sock->ops->bind(sock, (struct sockaddr *)address, addrlen);
1014 * Perform a listen. Basically, we allow the protocol to do anything
1015 * necessary for a listen, and if that works, we mark the socket as
1016 * ready for listening.
1019 asmlinkage long sys_listen(int fd, int backlog)
1021 struct socket *sock;
1024 if ((sock = sockfd_lookup(fd, &err)) != NULL) {
1025 if ((unsigned) backlog > SOMAXCONN)
1026 backlog = SOMAXCONN;
1027 err=sock->ops->listen(sock, backlog);
1035 * For accept, we attempt to create a new socket, set up the link
1036 * with the client, wake up the client, then return the new
1037 * connected fd. We collect the address of the connector in kernel
1038 * space and move it to user at the very end. This is unclean because
1039 * we open the socket then return an error.
1041 * 1003.1g adds the ability to recvmsg() to query connection pending
1042 * status to recvmsg. We need to add that support in a way thats
1043 * clean when we restucture accept also.
1046 asmlinkage long sys_accept(int fd, struct sockaddr *upeer_sockaddr, int *upeer_addrlen)
1048 struct socket *sock, *newsock;
1050 char address[MAX_SOCK_ADDR];
1052 sock = sockfd_lookup(fd, &err);
1057 if (!(newsock = sock_alloc()))
1060 newsock->type = sock->type;
1061 newsock->ops = sock->ops;
1063 err = sock->ops->accept(sock, newsock, sock->file->f_flags);
1067 if (upeer_sockaddr) {
1068 if(newsock->ops->getname(newsock, (struct sockaddr *)address, &len, 2)<0) {
1069 err = -ECONNABORTED;
1072 err = move_addr_to_user(address, len, upeer_sockaddr, upeer_addrlen);
1077 /* File flags are not inherited via accept() unlike another OSes. */
1079 if ((err = sock_map_fd(newsock)) < 0)
1088 sock_release(newsock);
1094 * Attempt to connect to a socket with the server address. The address
1095 * is in user space so we verify it is OK and move it to kernel space.
1097 * For 1003.1g we need to add clean support for a bind to AF_UNSPEC to
1100 * NOTE: 1003.1g draft 6.3 is broken with respect to AX.25/NetROM and
1101 * other SEQPACKET protocols that take time to connect() as it doesn't
1102 * include the -EINPROGRESS status for such sockets.
1105 asmlinkage long sys_connect(int fd, struct sockaddr *uservaddr, int addrlen)
1107 struct socket *sock;
1108 char address[MAX_SOCK_ADDR];
1111 sock = sockfd_lookup(fd, &err);
1114 err = move_addr_to_kernel(uservaddr, addrlen, address);
1117 err = sock->ops->connect(sock, (struct sockaddr *) address, addrlen,
1118 sock->file->f_flags);
1126 * Get the local address ('name') of a socket object. Move the obtained
1127 * name to user space.
1130 asmlinkage long sys_getsockname(int fd, struct sockaddr *usockaddr, int *usockaddr_len)
1132 struct socket *sock;
1133 char address[MAX_SOCK_ADDR];
1136 sock = sockfd_lookup(fd, &err);
1139 err = sock->ops->getname(sock, (struct sockaddr *)address, &len, 0);
1142 err = move_addr_to_user(address, len, usockaddr, usockaddr_len);
1151 * Get the remote address ('name') of a socket object. Move the obtained
1152 * name to user space.
1155 asmlinkage long sys_getpeername(int fd, struct sockaddr *usockaddr, int *usockaddr_len)
1157 struct socket *sock;
1158 char address[MAX_SOCK_ADDR];
1161 if ((sock = sockfd_lookup(fd, &err))!=NULL)
1163 err = sock->ops->getname(sock, (struct sockaddr *)address, &len, 1);
1165 err=move_addr_to_user(address,len, usockaddr, usockaddr_len);
1172 * Send a datagram to a given address. We move the address into kernel
1173 * space and check the user space data area is readable before invoking
1177 asmlinkage long sys_sendto(int fd, void * buff, size_t len, unsigned flags,
1178 struct sockaddr *addr, int addr_len)
1180 struct socket *sock;
1181 char address[MAX_SOCK_ADDR];
1186 sock = sockfd_lookup(fd, &err);
1194 msg.msg_control=NULL;
1195 msg.msg_controllen=0;
1199 err = move_addr_to_kernel(addr, addr_len, address);
1202 msg.msg_name=address;
1203 msg.msg_namelen=addr_len;
1205 if (sock->file->f_flags & O_NONBLOCK)
1206 flags |= MSG_DONTWAIT;
1207 msg.msg_flags = flags;
1208 err = sock_sendmsg(sock, &msg, len);
1217 * Send a datagram down a socket.
1220 asmlinkage long sys_send(int fd, void * buff, size_t len, unsigned flags)
1222 return sys_sendto(fd, buff, len, flags, NULL, 0);
1226 * Receive a frame from the socket and optionally record the address of the
1227 * sender. We verify the buffers are writable and if needed move the
1228 * sender address from kernel to user space.
1231 asmlinkage long sys_recvfrom(int fd, void * ubuf, size_t size, unsigned flags,
1232 struct sockaddr *addr, int *addr_len)
1234 struct socket *sock;
1237 char address[MAX_SOCK_ADDR];
1240 sock = sockfd_lookup(fd, &err);
1244 msg.msg_control=NULL;
1245 msg.msg_controllen=0;
1250 msg.msg_name=address;
1251 msg.msg_namelen=MAX_SOCK_ADDR;
1252 if (sock->file->f_flags & O_NONBLOCK)
1253 flags |= MSG_DONTWAIT;
1254 err=sock_recvmsg(sock, &msg, size, flags);
1256 if(err >= 0 && addr != NULL)
1258 err2=move_addr_to_user(address, msg.msg_namelen, addr, addr_len);
1268 * Receive a datagram from a socket.
1271 asmlinkage long sys_recv(int fd, void * ubuf, size_t size, unsigned flags)
1273 return sys_recvfrom(fd, ubuf, size, flags, NULL, NULL);
1277 * Set a socket option. Because we don't know the option lengths we have
1278 * to pass the user mode parameter for the protocols to sort out.
1281 asmlinkage long sys_setsockopt(int fd, int level, int optname, char *optval, int optlen)
1284 struct socket *sock;
1289 if ((sock = sockfd_lookup(fd, &err))!=NULL)
1291 if (level == SOL_SOCKET)
1292 err=sock_setsockopt(sock,level,optname,optval,optlen);
1294 err=sock->ops->setsockopt(sock, level, optname, optval, optlen);
1301 * Get a socket option. Because we don't know the option lengths we have
1302 * to pass a user mode parameter for the protocols to sort out.
1305 asmlinkage long sys_getsockopt(int fd, int level, int optname, char *optval, int *optlen)
1308 struct socket *sock;
1310 if ((sock = sockfd_lookup(fd, &err))!=NULL)
1312 if (level == SOL_SOCKET)
1313 err=sock_getsockopt(sock,level,optname,optval,optlen);
1315 err=sock->ops->getsockopt(sock, level, optname, optval, optlen);
1323 * Shutdown a socket.
1326 asmlinkage long sys_shutdown(int fd, int how)
1329 struct socket *sock;
1331 if ((sock = sockfd_lookup(fd, &err))!=NULL)
1333 err=sock->ops->shutdown(sock, how);
1340 * BSD sendmsg interface
1343 asmlinkage long sys_sendmsg(int fd, struct msghdr *msg, unsigned flags)
1345 struct socket *sock;
1346 char address[MAX_SOCK_ADDR];
1347 struct iovec iovstack[UIO_FASTIOV], *iov = iovstack;
1348 unsigned char ctl[sizeof(struct cmsghdr) + 20]; /* 20 is size of ipv6_pktinfo */
1349 unsigned char *ctl_buf = ctl;
1350 struct msghdr msg_sys;
1351 int err, ctl_len, iov_size, total_len;
1354 if (copy_from_user(&msg_sys,msg,sizeof(struct msghdr)))
1357 sock = sockfd_lookup(fd, &err);
1361 /* do not move before msg_sys is valid */
1363 if (msg_sys.msg_iovlen > UIO_MAXIOV)
1366 /* Check whether to allocate the iovec area*/
1368 iov_size = msg_sys.msg_iovlen * sizeof(struct iovec);
1369 if (msg_sys.msg_iovlen > UIO_FASTIOV) {
1370 iov = sock_kmalloc(sock->sk, iov_size, GFP_KERNEL);
1375 /* This will also move the address data into kernel space */
1376 err = verify_iovec(&msg_sys, iov, address, VERIFY_READ);
1383 if (msg_sys.msg_controllen > INT_MAX)
1385 ctl_len = msg_sys.msg_controllen;
1388 if (ctl_len > sizeof(ctl))
1390 ctl_buf = sock_kmalloc(sock->sk, ctl_len, GFP_KERNEL);
1391 if (ctl_buf == NULL)
1395 if (copy_from_user(ctl_buf, msg_sys.msg_control, ctl_len))
1397 msg_sys.msg_control = ctl_buf;
1399 msg_sys.msg_flags = flags;
1401 if (sock->file->f_flags & O_NONBLOCK)
1402 msg_sys.msg_flags |= MSG_DONTWAIT;
1403 err = sock_sendmsg(sock, &msg_sys, total_len);
1407 sock_kfree_s(sock->sk, ctl_buf, ctl_len);
1409 if (iov != iovstack)
1410 sock_kfree_s(sock->sk, iov, iov_size);
1418 * BSD recvmsg interface
1421 asmlinkage long sys_recvmsg(int fd, struct msghdr *msg, unsigned int flags)
1423 struct socket *sock;
1424 struct iovec iovstack[UIO_FASTIOV];
1425 struct iovec *iov=iovstack;
1426 struct msghdr msg_sys;
1427 unsigned long cmsg_ptr;
1428 int err, iov_size, total_len, len;
1430 /* kernel mode address */
1431 char addr[MAX_SOCK_ADDR];
1433 /* user mode address pointers */
1434 struct sockaddr *uaddr;
1438 if (copy_from_user(&msg_sys,msg,sizeof(struct msghdr)))
1441 sock = sockfd_lookup(fd, &err);
1446 if (msg_sys.msg_iovlen > UIO_MAXIOV)
1449 /* Check whether to allocate the iovec area*/
1451 iov_size = msg_sys.msg_iovlen * sizeof(struct iovec);
1452 if (msg_sys.msg_iovlen > UIO_FASTIOV) {
1453 iov = sock_kmalloc(sock->sk, iov_size, GFP_KERNEL);
1459 * Save the user-mode address (verify_iovec will change the
1460 * kernel msghdr to use the kernel address space)
1463 uaddr = msg_sys.msg_name;
1464 uaddr_len = &msg->msg_namelen;
1465 err = verify_iovec(&msg_sys, iov, addr, VERIFY_WRITE);
1470 cmsg_ptr = (unsigned long)msg_sys.msg_control;
1471 msg_sys.msg_flags = 0;
1473 if (sock->file->f_flags & O_NONBLOCK)
1474 flags |= MSG_DONTWAIT;
1475 err = sock_recvmsg(sock, &msg_sys, total_len, flags);
1480 if (uaddr != NULL) {
1481 err = move_addr_to_user(addr, msg_sys.msg_namelen, uaddr, uaddr_len);
1485 err = __put_user(msg_sys.msg_flags, &msg->msg_flags);
1488 err = __put_user((unsigned long)msg_sys.msg_control-cmsg_ptr,
1489 &msg->msg_controllen);
1495 if (iov != iovstack)
1496 sock_kfree_s(sock->sk, iov, iov_size);
1505 * Perform a file control on a socket file descriptor.
1507 * Doesn't acquire a fd lock, because no network fcntl
1508 * function sleeps currently.
1511 int sock_fcntl(struct file *filp, unsigned int cmd, unsigned long arg)
1513 struct socket *sock;
1515 sock = socki_lookup (filp->f_dentry->d_inode);
1516 if (sock && sock->ops)
1517 return sock_no_fcntl(sock, cmd, arg);
1521 /* Argument list sizes for sys_socketcall */
1522 #define AL(x) ((x) * sizeof(unsigned long))
1523 static unsigned char nargs[18]={AL(0),AL(3),AL(3),AL(3),AL(2),AL(3),
1524 AL(3),AL(3),AL(4),AL(4),AL(4),AL(6),
1525 AL(6),AL(2),AL(5),AL(5),AL(3),AL(3)};
1529 * System call vectors.
1531 * Argument checking cleaned up. Saved 20% in size.
1532 * This function doesn't need to set the kernel lock because
1533 * it is set by the callees.
1536 asmlinkage long sys_socketcall(int call, unsigned long *args)
1539 unsigned long a0,a1;
1542 if(call<1||call>SYS_RECVMSG)
1545 /* copy_from_user should be SMP safe. */
1546 if (copy_from_user(a, args, nargs[call]))
1555 err = sys_socket(a0,a1,a[2]);
1558 err = sys_bind(a0,(struct sockaddr *)a1, a[2]);
1561 err = sys_connect(a0, (struct sockaddr *)a1, a[2]);
1564 err = sys_listen(a0,a1);
1567 err = sys_accept(a0,(struct sockaddr *)a1, (int *)a[2]);
1569 case SYS_GETSOCKNAME:
1570 err = sys_getsockname(a0,(struct sockaddr *)a1, (int *)a[2]);
1572 case SYS_GETPEERNAME:
1573 err = sys_getpeername(a0, (struct sockaddr *)a1, (int *)a[2]);
1575 case SYS_SOCKETPAIR:
1576 err = sys_socketpair(a0,a1, a[2], (int *)a[3]);
1579 err = sys_send(a0, (void *)a1, a[2], a[3]);
1582 err = sys_sendto(a0,(void *)a1, a[2], a[3],
1583 (struct sockaddr *)a[4], a[5]);
1586 err = sys_recv(a0, (void *)a1, a[2], a[3]);
1589 err = sys_recvfrom(a0, (void *)a1, a[2], a[3],
1590 (struct sockaddr *)a[4], (int *)a[5]);
1593 err = sys_shutdown(a0,a1);
1595 case SYS_SETSOCKOPT:
1596 err = sys_setsockopt(a0, a1, a[2], (char *)a[3], a[4]);
1598 case SYS_GETSOCKOPT:
1599 err = sys_getsockopt(a0, a1, a[2], (char *)a[3], (int *)a[4]);
1602 err = sys_sendmsg(a0, (struct msghdr *) a1, a[2]);
1605 err = sys_recvmsg(a0, (struct msghdr *) a1, a[2]);
1615 * This function is called by a protocol handler that wants to
1616 * advertise its address family, and have it linked into the
1620 int sock_register(struct net_proto_family *ops)
1624 if (ops->family >= NPROTO) {
1625 printk(KERN_CRIT "protocol %d >= NPROTO(%d)\n", ops->family, NPROTO);
1628 net_family_write_lock();
1630 if (net_families[ops->family] == NULL) {
1631 net_families[ops->family]=ops;
1634 net_family_write_unlock();
1639 * This function is called by a protocol handler that wants to
1640 * remove its address family, and have it unlinked from the
1644 int sock_unregister(int family)
1646 if (family < 0 || family >= NPROTO)
1649 net_family_write_lock();
1650 net_families[family]=NULL;
1651 net_family_write_unlock();
1656 extern void sk_init(void);
1658 #ifdef CONFIG_WAN_ROUTER
1659 extern void wanrouter_init(void);
1663 extern void bluez_init(void);
1666 void __init sock_init(void)
1670 printk(KERN_INFO "Linux NET4.0 for Linux 2.4\n");
1671 printk(KERN_INFO "Based upon Swansea University Computer Society NET3.039\n");
1674 * Initialize all address (protocol) families.
1677 for (i = 0; i < NPROTO; i++)
1678 net_families[i] = NULL;
1681 * Initialize sock SLAB cache.
1688 * Initialize skbuff SLAB cache
1697 #ifdef CONFIG_WAN_ROUTER
1702 * Initialize the protocols module.
1705 register_filesystem(&sock_fs_type);
1706 sock_mnt = kern_mount(&sock_fs_type);
1707 /* The real protocol initialization is performed when
1708 * do_initcalls is run.
1713 * The netlink device handler may be needed early.
1719 #ifdef CONFIG_NETLINK_DEV
1722 #ifdef CONFIG_NETFILTER
1731 int socket_get_info(char *buffer, char **start, off_t offset, int length)
1736 for (cpu=0; cpu<smp_num_cpus; cpu++)
1737 counter += sockets_in_use[cpu_logical_map(cpu)].counter;
1739 /* It can be negative, by the way. 8) */
1743 len = sprintf(buffer, "sockets: used %d\n", counter);
1749 *start = buffer + offset;