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[/] [or1k/] [trunk/] [uclinux/] [uClinux-2.0.x/] [net/] [socket.c] - Blame information for rev 1765

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/*
 * NET          An implementation of the SOCKET network access protocol.
 *
 * Version:     @(#)socket.c    1.1.93  18/02/95
 *
 * Authors:     Orest Zborowski, <obz@Kodak.COM>
 *              Ross Biro, <bir7@leland.Stanford.Edu>
 *              Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
 *
 * Fixes:
 *              Anonymous       :       NOTSOCK/BADF cleanup. Error fix in
 *                                      shutdown()
 *              Alan Cox        :       verify_area() fixes
 *              Alan Cox        :       Removed DDI
 *              Jonathan Kamens :       SOCK_DGRAM reconnect bug
 *              Alan Cox        :       Moved a load of checks to the very
 *                                      top level.
 *              Alan Cox        :       Move address structures to/from user
 *                                      mode above the protocol layers.
 *              Rob Janssen     :       Allow 0 length sends.
 *              Alan Cox        :       Asynchronous I/O support (cribbed from the
 *                                      tty drivers).
 *              Niibe Yutaka    :       Asynchronous I/O for writes (4.4BSD style)
 *              Jeff Uphoff     :       Made max number of sockets command-line
 *                                      configurable.
 *              Matti Aarnio    :       Made the number of sockets dynamic,
 *                                      to be allocated when needed, and mr.
 *                                      Uphoff's max is used as max to be
 *                                      allowed to allocate.
 *              Linus           :       Argh. removed all the socket allocation
 *                                      altogether: it's in the inode now.
 *              Alan Cox        :       Made sock_alloc()/sock_release() public
 *                                      for NetROM and future kernel nfsd type
 *                                      stuff.
 *              Alan Cox        :       sendmsg/recvmsg basics.
 *              Tom Dyas        :       Export net symbols.
 *              Marcin Dalecki  :       Fixed problems with CONFIG_NET="n".
 *
 *
 *              This program is free software; you can redistribute it and/or
 *              modify it under the terms of the GNU General Public License
 *              as published by the Free Software Foundation; either version
 *              2 of the License, or (at your option) any later version.
 *
 *
 *      This module is effectively the top level interface to the BSD socket
 *      paradigm. Because it is very simple it works well for Unix domain sockets,
 *      but requires a whole layer of substructure for the other protocols.
 *
 *      In addition it lacks an effective kernel -> kernel interface to go with
 *      the user one.
 */
 
#include <linux/config.h>
#include <linux/signal.h>
#include <linux/errno.h>
#include <linux/sched.h>
#include <linux/mm.h>
#include <linux/kernel.h>
#include <linux/major.h>
#include <linux/stat.h>
#include <linux/socket.h>
#include <linux/fcntl.h>
#include <linux/file.h>
#include <linux/net.h>
#include <linux/interrupt.h>
#include <linux/netdevice.h>
#include <linux/proc_fs.h>
#include <linux/firewall.h>
 
#ifdef CONFIG_KERNELD
#include <linux/kerneld.h>
#endif
 
#include <net/netlink.h>
 
#include <asm/system.h>
#include <asm/segment.h>
 
#if defined(CONFIG_MODULES) && defined(CONFIG_NET)
extern void export_net_symbols(void);
#endif
 
static int sock_lseek(struct inode *inode, struct file *file, off_t offset,
                      int whence);
static int sock_read(struct inode *inode, struct file *file, char *buf,
                     int size);
static int sock_write(struct inode *inode, struct file *file, const char *buf,
                      int size);
 
static void sock_close(struct inode *inode, struct file *file);
static int sock_no_open(struct inode *inode, struct file *file);
static int sock_select(struct inode *inode, struct file *file, int which, select_table *seltable);
static int sock_ioctl(struct inode *inode, struct file *file,
                      unsigned int cmd, unsigned long arg);
static int sock_fasync(struct inode *inode, struct file *filp, int on);
 
 
/*
 *      Socket files have a set of 'special' operations as well as the generic file ones. These don't appear
 *      in the operation structures but are done directly via the socketcall() multiplexor.
 */
 
static struct file_operations socket_file_ops = {
        sock_lseek,
        sock_read,
        sock_write,
        NULL,                   /* readdir */
        sock_select,
        sock_ioctl,
        NULL,                   /* mmap */
        sock_no_open,           /* special open code... */
        sock_close,
        NULL,                   /* no fsync */
        sock_fasync
};
 
/*
 *      The protocol list. Each protocol is registered in here.
 */
static struct proto_ops *pops[NPROTO];
/*
 *      Statistics counters of the socket lists
 */
static int sockets_in_use  = 0;
 
/*
 *      Support routines. Move socket addresses back and forth across the kernel/user
 *      divide and look after the messy bits.
 */
 
#define MAX_SOCK_ADDR   128             /* 108 for Unix domain - 16 for IP, 16 for IPX, about 80 for AX.25 */
 
int move_addr_to_kernel(void *uaddr, int ulen, void *kaddr)
{
        int err;
        if(ulen<0||ulen>MAX_SOCK_ADDR)
                return -EINVAL;
        if(ulen==0)
                return 0;
        if((err=verify_area(VERIFY_READ,uaddr,ulen))<0)
                return err;
        memcpy_fromfs(kaddr,uaddr,ulen);
        return 0;
}
 
int move_addr_to_user(void *kaddr, int klen, void *uaddr, int *ulen)
{
        int err;
        int len;
 
 
        if((err=verify_area(VERIFY_WRITE,ulen,sizeof(*ulen)))<0)
                return err;
        len=get_user(ulen);
        if(len>klen)
                len=klen;
        if(len<0 || len> MAX_SOCK_ADDR)
                return -EINVAL;
        if(len)
        {
                if((err=verify_area(VERIFY_WRITE,uaddr,len))<0)
                        return err;
                memcpy_tofs(uaddr,kaddr,len);
        }
        put_user(len,ulen);
        return 0;
}
 
/*
 *      Obtains the first available file descriptor and sets it up for use.
 */
 
static int get_fd(struct inode *inode)
{
        int fd;
 
        /*
         *      Find a file descriptor suitable for return to the user.
         */
 
        fd = get_unused_fd();
        if (fd >= 0) {
                struct file *file = get_empty_filp();
 
                if (!file) {
                        put_unused_fd(fd);
                        return -ENFILE;
                }
 
                current->files->fd[fd] = file;
                file->f_op = &socket_file_ops;
                file->f_mode = 3;
                file->f_flags = O_RDWR;
                file->f_count = 1;
                file->f_inode = inode;
                if (inode)
                        inode->i_count++;
                file->f_pos = 0;
        }
        return fd;
}
 
 
/*
 *      Go from an inode to its socket slot.
 *
 * The original socket implementation wasn't very clever, which is
 * why this exists at all..
 */
 
__inline struct socket *socki_lookup(struct inode *inode)
{
        return &inode->u.socket_i;
}
 
/*
 *      Go from a file number to its socket slot.
 */
 
extern __inline struct socket *sockfd_lookup(int fd, int *err)
{
        struct file *file;
        struct inode *inode;
        struct socket *sock;
 
        if (!(file = fget(fd)))
        {
                *err = -EBADF;
                return NULL;
        }
 
        inode = file->f_inode;
 
        if (!inode || !inode->i_sock || !(sock = socki_lookup(inode)))
        {
                *err = -ENOTSOCK;
                fput(file, inode);
                return NULL;
        }
 
        if (sock->file != file) {
                printk(KERN_ERR "socki_lookup: socket file changed!\n");
                sock->file = file;
        }
 
        return sock;
}
 
extern __inline__ void sockfd_put(struct socket *sock)
{
        fput(sock->file, sock->file->f_inode);
}
 
/*
 *      Allocate a socket.
 */
 
struct socket *sock_alloc(void)
{
        struct inode * inode;
        struct socket * sock;
 
        inode = get_empty_inode();
        if (!inode)
                return NULL;
 
        inode->i_mode = S_IFSOCK;
        inode->i_sock = 1;
        inode->i_uid = current->uid;
        inode->i_gid = current->gid;
 
        sock = &inode->u.socket_i;
        sock->state = SS_UNCONNECTED;
        sock->flags = 0;
        sock->ops = NULL;
        sock->data = NULL;
        sock->conn = NULL;
        sock->iconn = NULL;
        sock->next = NULL;
        sock->file = NULL;
        sock->wait = &inode->i_wait;
        sock->inode = inode;            /* "backlink": we could use pointer arithmetic instead */
        sock->fasync_list = NULL;
        sock->file = NULL;
        sockets_in_use++;
        return sock;
}
 
/*
 *      Release a socket.
 */
 
static inline void sock_release_peer(struct socket *peer)
{
        peer->state = SS_DISCONNECTING;
        wake_up_interruptible(peer->wait);
        sock_wake_async(peer, 1);
}
 
/*
 *      In theory you can't get an open on this inode, but /proc provides
 *      a back door. Remember to keep it shut otherwise you'll let the
 *      creepy crawlies in.
 */
 
static int sock_no_open(struct inode *inode, struct file *file)
{
        return -ENXIO;
}
 
void sock_release(struct socket *sock)
{
        int oldstate;
        struct socket *peersock, *nextsock;
 
        if ((oldstate = sock->state) != SS_UNCONNECTED)
                sock->state = SS_DISCONNECTING;
 
        /*
         *      Wake up anyone waiting for connections.
         */
 
        for (peersock = sock->iconn; peersock; peersock = nextsock)
        {
                nextsock = peersock->next;
                sock_release_peer(peersock);
        }
 
        /*
         * Wake up anyone we're connected to. First, we release the
         * protocol, to give it a chance to flush data, etc.
         */
 
        peersock = (oldstate == SS_CONNECTED) ? sock->conn : NULL;
        if (sock->ops)
                sock->ops->release(sock, peersock);
        if (peersock)
                sock_release_peer(peersock);
        --sockets_in_use;       /* Bookkeeping.. */
        sock->file=NULL;
        iput(SOCK_INODE(sock));
}
 
/*
 *      Sockets are not seekable.
 */
 
static int sock_lseek(struct inode *inode, struct file *file, off_t offset, int whence)
{
        return(-ESPIPE);
}
 
/*
 *      Read data from a socket. ubuf is a user mode pointer. We make sure the user
 *      area ubuf...ubuf+size-1 is writable before asking the protocol.
 */
 
static int sock_read(struct inode *inode, struct file *file, char *ubuf, int size)
{
        struct socket *sock;
        int err;
        struct iovec iov;
        struct msghdr msg;
 
        sock = socki_lookup(inode);
        if (sock->flags & SO_ACCEPTCON)
                return(-EINVAL);
 
        if(size<0)
                return -EINVAL;
        if(size==0)              /* Match SYS5 behaviour */
                return 0;
        if ((err=verify_area(VERIFY_WRITE,ubuf,size))<0)
                return err;
        msg.msg_name=NULL;
        msg.msg_iov=&iov;
        msg.msg_iovlen=1;
        msg.msg_control=NULL;
        iov.iov_base=ubuf;
        iov.iov_len=size;
 
        return(sock->ops->recvmsg(sock, &msg, size,(file->f_flags & O_NONBLOCK), 0,&msg.msg_namelen));
}
 
/*
 *      Write data to a socket. We verify that the user area ubuf..ubuf+size-1 is
 *      readable by the user process.
 */
 
static int sock_write(struct inode *inode, struct file *file, const char *ubuf, int size)
{
        struct socket *sock;
        int err;
        struct msghdr msg;
        struct iovec iov;
 
        sock = socki_lookup(inode);
 
        if (sock->flags & SO_ACCEPTCON)
                return(-EINVAL);
 
        if(size<0)
                return -EINVAL;
        if(size==0)              /* Match SYS5 behaviour */
                return 0;
 
        if ((err=verify_area(VERIFY_READ,ubuf,size))<0)
                return err;
 
        msg.msg_name=NULL;
        msg.msg_iov=&iov;
        msg.msg_iovlen=1;
        msg.msg_control=NULL;
        iov.iov_base=(void *)ubuf;
        iov.iov_len=size;
 
        return(sock->ops->sendmsg(sock, &msg, size,(file->f_flags & O_NONBLOCK),0));
}
 
/*
 *      With an ioctl arg may well be a user mode pointer, but we don't know what to do
 *      with it - that's up to the protocol still.
 */
 
int sock_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
           unsigned long arg)
{
        struct socket *sock;
        sock = socki_lookup(inode);
        return(sock->ops->ioctl(sock, cmd, arg));
}
 
 
static int sock_select(struct inode *inode, struct file *file, int sel_type, select_table * wait)
{
        struct socket *sock;
 
        sock = socki_lookup(inode);
 
        /*
         *      We can't return errors to select, so it's either yes or no.
         */
 
        if (sock->ops->select)
                return(sock->ops->select(sock, sel_type, wait));
        return(0);
}
 
 
void sock_close(struct inode *inode, struct file *filp)
{
        /*
         *      It's possible the inode is NULL if we're closing an unfinished socket.
         */
 
        if (!inode)
                return;
        sock_fasync(inode, filp, 0);
        sock_release(socki_lookup(inode));
}
 
/*
 *      Update the socket async list
 */
 
static int sock_fasync(struct inode *inode, struct file *filp, int on)
{
        struct fasync_struct *fa, *fna=NULL, **prev;
        struct socket *sock;
        unsigned long flags;
 
        if (on)
        {
                fna=(struct fasync_struct *)kmalloc(sizeof(struct fasync_struct), GFP_KERNEL);
                if(fna==NULL)
                        return -ENOMEM;
        }
 
        sock = socki_lookup(inode);
 
        prev=&(sock->fasync_list);
 
        save_flags(flags);
        cli();
 
        for(fa=*prev; fa!=NULL; prev=&fa->fa_next,fa=*prev)
                if(fa->fa_file==filp)
                        break;
 
        if(on)
        {
                if(fa!=NULL)
                {
                        kfree_s(fna,sizeof(struct fasync_struct));
                        restore_flags(flags);
                        return 0;
                }
                fna->fa_file=filp;
                fna->magic=FASYNC_MAGIC;
                fna->fa_next=sock->fasync_list;
                sock->fasync_list=fna;
        }
        else
        {
                if(fa!=NULL)
                {
                        *prev=fa->fa_next;
                        kfree_s(fa,sizeof(struct fasync_struct));
                }
        }
        restore_flags(flags);
        return 0;
}
 
int sock_wake_async(struct socket *sock, int how)
{
        if (!sock || !sock->fasync_list)
                return -1;
        switch (how)
        {
                case 0:
                        kill_fasync(sock->fasync_list, SIGIO);
                        break;
                case 1:
                        if (!(sock->flags & SO_WAITDATA))
                                kill_fasync(sock->fasync_list, SIGIO);
                        break;
                case 2:
                        if (sock->flags & SO_NOSPACE)
                        {
                                kill_fasync(sock->fasync_list, SIGIO);
                                sock->flags &= ~SO_NOSPACE;
                        }
                        break;
        }
        return 0;
}
 
 
/*
 *      Perform the socket system call. we locate the appropriate
 *      family, then create a fresh socket.
 */
 
static int find_protocol_family(int family)
{
        register int i;
        for (i = 0; i < NPROTO; i++)
        {
                if (pops[i] == NULL)
                        continue;
                if (pops[i]->family == family)
                        return i;
        }
        return -1;
}
 
asmlinkage int sys_socket(int family, int type, int protocol)
{
        int i, fd;
        struct socket *sock;
        struct proto_ops *ops;
 
        /* Locate the correct protocol family. */
        i = find_protocol_family(family);
 
#ifdef CONFIG_KERNELD
        /* Attempt to load a protocol module if the find failed. */
        if (i < 0)
        {
                char module_name[30];
                sprintf(module_name,"net-pf-%d",family);
                request_module(module_name);
                i = find_protocol_family(family);
        }
#endif
 
        if (i < 0)
        {
                return -EINVAL;
        }
 
        ops = pops[i];
 
/*
 *      Check that this is a type that we know how to manipulate and
 *      the protocol makes sense here. The family can still reject the
 *      protocol later.
 */
 
        if ((type != SOCK_STREAM && type != SOCK_DGRAM &&
                type != SOCK_SEQPACKET && type != SOCK_RAW &&
                type != SOCK_PACKET) || protocol < 0)
                        return(-EINVAL);
 
/*
 *      Allocate the socket and allow the family to set things up. if
 *      the protocol is 0, the family is instructed to select an appropriate
 *      default.
 */
 
        if (!(sock = sock_alloc()))
        {
                printk(KERN_WARNING "socket: no more sockets\n");
                return(-ENOSR); /* Was: EAGAIN, but we are out of
                                   system resources! */
        }
 
        sock->type = type;
        sock->ops = ops;
        if ((i = sock->ops->create(sock, protocol)) < 0)
        {
                sock_release(sock);
                return(i);
        }
 
        if ((fd = get_fd(SOCK_INODE(sock))) < 0)
        {
                sock_release(sock);
                return fd;
        }
 
        sock->file=current->files->fd[fd];
 
        return(fd);
}
 
/*
 *      Create a pair of connected sockets.
 */
 
asmlinkage int sys_socketpair(int family, int type, int protocol, int usockvec[2])
{
        int fd1, fd2, i;
        struct socket *sock1, *sock2;
        int er;
 
        /*
         * Obtain the first socket and check if the underlying protocol
         * supports the socketpair call.
         */
 
        if ((fd1 = sys_socket(family, type, protocol)) < 0)
                return(fd1);
        sock1 = sockfd_lookup(fd1, &er);
        if (!sock1->ops->socketpair)
        {
                sockfd_put(sock1);
                sys_close(fd1);
                return(-EINVAL);
        }
 
        /*
         *      Now grab another socket and try to connect the two together.
         */
 
        if ((fd2 = sys_socket(family, type, protocol)) < 0)
        {
                sockfd_put(sock1);
                sys_close(fd1);
                return(-EINVAL);
        }
 
        sock2 = sockfd_lookup(fd2, &er);
        if ((i = sock1->ops->socketpair(sock1, sock2)) < 0)
        {
                sockfd_put(sock1);
                sys_close(fd1);
                sockfd_put(sock2);
                sys_close(fd2);
                return(i);
        }
 
        sock1->conn = sock2;
        sock2->conn = sock1;
        sock1->state = SS_CONNECTED;
        sock2->state = SS_CONNECTED;
 
        er=verify_area(VERIFY_WRITE, usockvec, sizeof(usockvec));
        if(er)
        {
                sockfd_put(sock1);
                sys_close(fd1);
                sockfd_put(sock2);
                sys_close(fd2);
                return er;
        }
        put_user(fd1, &usockvec[0]);
        put_user(fd2, &usockvec[1]);
 
        sockfd_put(sock1);
        sockfd_put(sock2);
        return(0);
}
 
 
/*
 *      Bind a name to a socket. Nothing much to do here since it's
 *      the protocol's responsibility to handle the local address.
 *
 *      We move the socket address to kernel space before we call
 *      the protocol layer (having also checked the address is ok).
 */
 
asmlinkage int sys_bind(int fd, struct sockaddr *umyaddr, int addrlen)
{
        struct socket *sock;
        char address[MAX_SOCK_ADDR];
        int err;
 
        if (!(sock = sockfd_lookup(fd, &err)))
                return err;
 
        if((err=move_addr_to_kernel(umyaddr,addrlen,address))<0)
                goto out;
 
        if ((err = sock->ops->bind(sock, (struct sockaddr *)address, addrlen)) > 0)
                err = 0;
out:
        sockfd_put(sock);
        return err;
}
 
 
/*
 *      Perform a listen. Basically, we allow the protocol to do anything
 *      necessary for a listen, and if that works, we mark the socket as
 *      ready for listening.
 */
 
asmlinkage int sys_listen(int fd, int backlog)
{
        struct socket *sock;
        int err=-EOPNOTSUPP;
 
        if (!(sock = sockfd_lookup(fd, &err)))
                return err;
 
        if (sock->state != SS_UNCONNECTED)
        {
                err=-EINVAL;
                goto out;
        }
 
        if (sock->ops && sock->ops->listen)
        {
                err=sock->ops->listen(sock, backlog);
                if(!err)
                        sock->flags |= SO_ACCEPTCON;
        }
out:
        sockfd_put(sock);
        return(err);
}
 
 
/*
 *      For accept, we attempt to create a new socket, set up the link
 *      with the client, wake up the client, then return the new
 *      connected fd. We collect the address of the connector in kernel
 *      space and move it to user at the very end. This is buggy because
 *      we open the socket then return an error.
 */
 
asmlinkage int sys_accept(int fd, struct sockaddr *upeer_sockaddr, int *upeer_addrlen)
{
        struct socket *sock, *newsock;
        int i;
        char address[MAX_SOCK_ADDR];
        int len;
 
        if (!(sock = sockfd_lookup(fd, &i)))
                return i;
        if (sock->state != SS_UNCONNECTED || (!(sock->flags & SO_ACCEPTCON)))
        {
                sockfd_put(sock);
                return(-EINVAL);
        }
 
        if (!(newsock = sock_alloc()))
        {
                printk(KERN_WARNING "accept: no more sockets\n");
                sockfd_put(sock);
                return(-ENOSR); /* Was: EAGAIN, but we are out of system
                                   resources! */
        }
        newsock->type = sock->type;
        newsock->ops = sock->ops;
        if ((i = sock->ops->dup(newsock, sock)) < 0)
        {
                sock_release(newsock);
                sockfd_put(sock);
                return(i);
        }
 
        i = newsock->ops->accept(sock, newsock, sock->file->f_flags);
        if ( i < 0)
        {
                sock_release(newsock);
                sockfd_put(sock);
                return(i);
        }
 
        if ((fd = get_fd(SOCK_INODE(newsock))) < 0)
        {
                sock_release(newsock);
                sockfd_put(sock);
                return(-EINVAL);
        }
        newsock->file=current->files->fd[fd];
 
        if (upeer_sockaddr)
        {
                newsock->ops->getname(newsock, (struct sockaddr *)address, &len, 1);
                move_addr_to_user(address,len, upeer_sockaddr, upeer_addrlen);
        }
        sockfd_put(sock);
        return(fd);
}
 
 
/*
 *      Attempt to connect to a socket with the server address.  The address
 *      is in user space so we verify it is OK and move it to kernel space.
 */
 
asmlinkage int sys_connect(int fd, struct sockaddr *uservaddr, int addrlen)
{
        struct socket *sock;
        char address[MAX_SOCK_ADDR];
        int err;
 
        if (!(sock = sockfd_lookup(fd, &err)))
                return(err);
 
        if((err=move_addr_to_kernel(uservaddr,addrlen,address))<0)
                goto out;
 
        switch(sock->state)
        {
                case SS_UNCONNECTED:
                        /* This is ok... continue with connect */
                        break;
                case SS_CONNECTED:
                        /* Socket is already connected */
                        if(sock->type == SOCK_DGRAM) /* Hack for now - move this all into the protocol */
                                break;
                        err = -EISCONN;
                        goto out;
                case SS_CONNECTING:
                        /* Not yet connected... we will check this. */
 
                        /*
                         *      FIXME:  for all protocols what happens if you start
                         *      an async connect fork and both children connect. Clean
                         *      this up in the protocols!
                         */
                        break;
                default:
                        err = -EINVAL;
                        goto out;
        }
        err = sock->ops->connect(sock, (struct sockaddr *)address, addrlen, sock->file->f_flags);
        if (err > 0)
                err = 0;
out:
        sockfd_put(sock);
        return err;
}
 
/*
 *      Get the local address ('name') of a socket object. Move the obtained
 *      name to user space.
 */
 
asmlinkage int sys_getsockname(int fd, struct sockaddr *usockaddr, int *usockaddr_len)
{
        struct socket *sock;
        char address[MAX_SOCK_ADDR];
        int len;
        int err;
 
        if (!(sock = sockfd_lookup(fd, &err)))
                return err;
 
        err=sock->ops->getname(sock, (struct sockaddr *)address, &len, 0);
        if(err)
                goto out;
        if((err=move_addr_to_user(address,len, usockaddr, usockaddr_len))>0)
                err = 0;
out:
        sockfd_put(sock);
        return err;
}
 
/*
 *      Get the remote address ('name') of a socket object. Move the obtained
 *      name to user space.
 */
 
asmlinkage int sys_getpeername(int fd, struct sockaddr *usockaddr, int *usockaddr_len)
{
        struct socket *sock;
        char address[MAX_SOCK_ADDR];
        int len;
        int err;
 
        if (!(sock = sockfd_lookup(fd, &err)))
                return err;
 
        err=sock->ops->getname(sock, (struct sockaddr *)address, &len, 1);
        if(err)
                goto out;
        if((err=move_addr_to_user(address,len, usockaddr, usockaddr_len))>0)
                err = 0;
out:
        sockfd_put(sock);
        return err;
}
 
/*
 *      Send a datagram down a socket. The datagram as with write() is
 *      in user space. We check it can be read.
 */
 
asmlinkage int sys_send(int fd, void * buff, int len, unsigned flags)
{
        struct socket *sock;
        int err;
        struct msghdr msg;
        struct iovec iov;
 
        if(len<0)
                return -EINVAL;
        err=verify_area(VERIFY_READ, buff, len);
        if(err)
                return err;
 
        if (!(sock = sockfd_lookup(fd, &err)))
                return err;
 
        iov.iov_base=buff;
        iov.iov_len=len;
        msg.msg_name=NULL;
        msg.msg_iov=&iov;
        msg.msg_iovlen=1;
        msg.msg_control=NULL;
        err=sock->ops->sendmsg(sock, &msg, len, (sock->file->f_flags & O_NONBLOCK), flags);
        sockfd_put(sock);
        return err;
}
 
/*
 *      Send a datagram to a given address. We move the address into kernel
 *      space and check the user space data area is readable before invoking
 *      the protocol.
 */
 
asmlinkage int sys_sendto(int fd, void * buff, int len, unsigned flags,
           struct sockaddr *addr, int addr_len)
{
        struct socket *sock;
        char address[MAX_SOCK_ADDR];
        int err;
        struct msghdr msg;
        struct iovec iov;
 
        if(len<0)
                return -EINVAL;
        err=verify_area(VERIFY_READ,buff,len);
        if(err)
                return err;
        if (!(sock = sockfd_lookup(fd, &err)))
                return err;
 
        iov.iov_base=buff;
        iov.iov_len=len;
        msg.msg_name = NULL;
        msg.msg_namelen = 0;
        msg.msg_iov=&iov;
        msg.msg_iovlen=1;
        msg.msg_control=NULL;
        if (addr && addr_len) {
                err=move_addr_to_kernel(addr,addr_len,address);
                if (err < 0)
                {
                        sockfd_put(sock);
                        return err;
                }
                msg.msg_name=address;
                msg.msg_namelen=addr_len;
        }
 
        err=sock->ops->sendmsg(sock, &msg, len, (sock->file->f_flags & O_NONBLOCK), flags);
        sockfd_put(sock);
        return err;
}
 
 
/*
 *      Receive a datagram from a socket. Call the protocol recvmsg method
 */
 
asmlinkage int sys_recv(int fd, void * ubuf, int size, unsigned flags)
{
        struct iovec iov;
        struct msghdr msg;
        struct socket *sock;
        int err;
 
        if(size<0)
                return -EINVAL;
        if(size==0)
                return 0;
        err=verify_area(VERIFY_WRITE, ubuf, size);
        if(err)
                return err;
        if (!(sock = sockfd_lookup(fd, &err)))
                return err;
 
        msg.msg_name=NULL;
        msg.msg_iov=&iov;
        msg.msg_iovlen=1;
        msg.msg_control=NULL;
        iov.iov_base=ubuf;
        iov.iov_len=size;
 
        err=sock->ops->recvmsg(sock, &msg, size,(sock->file->f_flags & O_NONBLOCK), flags,&msg.msg_namelen);
        sockfd_put(sock);
        return err;
}
 
/*
 *      Receive a frame from the socket and optionally record the address of the
 *      sender. We verify the buffers are writable and if needed move the
 *      sender address from kernel to user space.
 */
 
asmlinkage int sys_recvfrom(int fd, void * ubuf, int size, unsigned flags,
             struct sockaddr *addr, int *addr_len)
{
        struct socket *sock;
        struct iovec iov;
        struct msghdr msg;
        char address[MAX_SOCK_ADDR];
        int err;
        int alen;
        if(size<0)
                return -EINVAL;
        if(size==0)
                return 0;
        err=verify_area(VERIFY_WRITE,ubuf,size);
        if(err)
                return err;
        if (!(sock = sockfd_lookup(fd, &err)))
                return err;
 
        msg.msg_control=NULL;
        msg.msg_iovlen=1;
        msg.msg_iov=&iov;
        iov.iov_len=size;
        iov.iov_base=ubuf;
        msg.msg_name=address;
        msg.msg_namelen=MAX_SOCK_ADDR;
        size=sock->ops->recvmsg(sock, &msg, size, (sock->file->f_flags & O_NONBLOCK),
                     flags, &alen);
 
        sockfd_put(sock);
 
        if(size<0)
                return size;
        if(addr!=NULL && (err=move_addr_to_user(address,alen, addr, addr_len))<0)
                return err;
 
        return size;
}
 
/*
 *      Set a socket option. Because we don't know the option lengths we have
 *      to pass the user mode parameter for the protocols to sort out.
 */
 
asmlinkage int sys_setsockopt(int fd, int level, int optname, char *optval, int optlen)
{
        struct socket *sock;
        int err;
 
        if (!(sock = sockfd_lookup(fd, &err)))
                return err;
 
        err=sock->ops->setsockopt(sock, level, optname, optval, optlen);
        sockfd_put(sock);
        return err;
}
 
/*
 *      Get a socket option. Because we don't know the option lengths we have
 *      to pass a user mode parameter for the protocols to sort out.
 */
 
asmlinkage int sys_getsockopt(int fd, int level, int optname, char *optval, int *optlen)
{
        struct socket *sock;
        int err;
 
        if (!(sock = sockfd_lookup(fd, &err)))
                return err;
 
        if (!sock->ops->getsockopt)
        {
                sockfd_put(sock);
                return(0);
        }
        err=sock->ops->getsockopt(sock, level, optname, optval, optlen);
        sockfd_put(sock);
        return err;
}
 
 
/*
 *      Shutdown a socket.
 */
 
asmlinkage int sys_shutdown(int fd, int how)
{
        struct socket *sock;
        int err;
 
        if (!(sock = sockfd_lookup(fd, &err)))
                return err;
        err=sock->ops->shutdown(sock, how);
        sockfd_put(sock);
        return err;
}
 
/*
 *      BSD sendmsg interface
 */
 
asmlinkage int sys_sendmsg(int fd, struct msghdr *msg, unsigned int flags)
{
        struct socket *sock;
        char address[MAX_SOCK_ADDR];
        struct iovec iov[UIO_MAXIOV];
        struct msghdr msg_sys;
        int err;
        int total_len;
 
        err=verify_area(VERIFY_READ, msg,sizeof(struct msghdr));
        if(err)
                return err;
        if (!(sock = sockfd_lookup(fd, &err)))
                return err;
        if(sock->ops->sendmsg==NULL)
        {
                err = -EOPNOTSUPP;
                goto out;
        }
 
        memcpy_fromfs(&msg_sys,msg,sizeof(struct msghdr));
 
        /* do not move before msg_sys is valid */
        if(msg_sys.msg_iovlen>UIO_MAXIOV)
        {
                err = -EINVAL;
                goto out;
        }
 
        /* This will also move the address data into kernel space */
        err = verify_iovec(&msg_sys, iov, address, VERIFY_READ);
        if (err < 0)
                goto out;
 
        total_len=err;
 
        err=sock->ops->sendmsg(sock, &msg_sys, total_len, (sock->file->f_flags&O_NONBLOCK), flags);
out:
        sockfd_put(sock);
        return err;
}
 
/*
 *      BSD recvmsg interface
 */
 
asmlinkage int sys_recvmsg(int fd, struct msghdr *msg, unsigned int flags)
{
        struct socket *sock;
        struct iovec iov[UIO_MAXIOV];
        struct msghdr msg_sys;
        int err;
        int total_len;
        int len;
 
        /* kernel mode address */
        char addr[MAX_SOCK_ADDR];
        int addr_len;
 
        /* user mode address pointers */
        struct sockaddr *uaddr;
        int *uaddr_len;
 
        err=verify_area(VERIFY_READ, msg,sizeof(struct msghdr));
        if(err)
                return err;
        memcpy_fromfs(&msg_sys,msg,sizeof(struct msghdr));
        if(msg_sys.msg_iovlen>UIO_MAXIOV)
                return -EINVAL;
 
        if (!(sock = sockfd_lookup(fd, &err)))
                return err;
 
 
        /*
         * save the user-mode address (verify_iovec will change the
         * kernel msghdr to use the kernel address space)
         */
        uaddr = msg_sys.msg_name;
        uaddr_len = &msg->msg_namelen;
        err=verify_iovec(&msg_sys,iov,addr, VERIFY_WRITE);
        if(err<0)
                goto out;
 
        total_len=err;
 
        if(sock->ops->recvmsg==NULL)
        {
                err = -EOPNOTSUPP;
                goto out;
        }
        err=sock->ops->recvmsg(sock, &msg_sys, total_len, (sock->file->f_flags&O_NONBLOCK), flags, &addr_len);
        if(err<0)
                goto out;
        len=err;
 
        if (uaddr != NULL) {
                err = move_addr_to_user(addr, addr_len, uaddr, uaddr_len);
                if (err)
                        goto out;
        }
        sockfd_put(sock);
        return len;
 
out:
        sockfd_put(sock);
        return err;
}
 
 
/*
 *      Perform a file control on a socket file descriptor.
 */
 
int sock_fcntl(struct file *filp, unsigned int cmd, unsigned long arg)
{
        struct socket *sock;
 
        sock = socki_lookup (filp->f_inode);
        if (sock != NULL && sock->ops != NULL && sock->ops->fcntl != NULL)
                return(sock->ops->fcntl(sock, cmd, arg));
        return(-EINVAL);
}
 
 
/*
 *      System call vectors. Since I (RIB) want to rewrite sockets as streams,
 *      we have this level of indirection. Not a lot of overhead, since more of
 *      the work is done via read/write/select directly.
 *
 *      I'm now expanding this up to a higher level to separate the assorted
 *      kernel/user space manipulations and global assumptions from the protocol
 *      layers proper - AC.
 *
 *      Argument checking cleaned up. Saved 20% in size.
 */
 
asmlinkage int sys_socketcall(int call, unsigned long *args)
{
        int er;
        unsigned char nargs[18]={0,3,3,3,2,3,3,3,
                                 4,4,4,6,6,2,5,5,3,3};
 
        unsigned long a0,a1;
 
        if(call<1||call>SYS_RECVMSG)
                return -EINVAL;
 
        er=verify_area(VERIFY_READ, args, nargs[call] * sizeof(unsigned long));
        if(er)
                return er;
 
        a0=get_user(args);
        a1=get_user(args+1);
 
 
        switch(call)
        {
                case SYS_SOCKET:
                        return(sys_socket(a0,a1,get_user(args+2)));
                case SYS_BIND:
                        return(sys_bind(a0,(struct sockaddr *)a1,
                                        get_user(args+2)));
                case SYS_CONNECT:
                        return(sys_connect(a0, (struct sockaddr *)a1,
                                           get_user(args+2)));
                case SYS_LISTEN:
                        return(sys_listen(a0,a1));
                case SYS_ACCEPT:
                        return(sys_accept(a0,(struct sockaddr *)a1,
                                          (int *)get_user(args+2)));
                case SYS_GETSOCKNAME:
                        return(sys_getsockname(a0,(struct sockaddr *)a1,
                                               (int *)get_user(args+2)));
                case SYS_GETPEERNAME:
                        return(sys_getpeername(a0, (struct sockaddr *)a1,
                                               (int *)get_user(args+2)));
                case SYS_SOCKETPAIR:
                        return(sys_socketpair(a0,a1,
                                              get_user(args+2),
                                              (int *)get_user(args+3)));
                case SYS_SEND:
                        return(sys_send(a0,
                                (void *)a1,
                                get_user(args+2),
                                get_user(args+3)));
                case SYS_SENDTO:
                        return(sys_sendto(a0,(void *)a1,
                                get_user(args+2),
                                get_user(args+3),
                                (struct sockaddr *)get_user(args+4),
                                get_user(args+5)));
                case SYS_RECV:
                        return(sys_recv(a0,
                                (void *)a1,
                                get_user(args+2),
                                get_user(args+3)));
                case SYS_RECVFROM:
                        return(sys_recvfrom(a0,
                                (void *)a1,
                                get_user(args+2),
                                get_user(args+3),
                                (struct sockaddr *)get_user(args+4),
                                (int *)get_user(args+5)));
                case SYS_SHUTDOWN:
                        return(sys_shutdown(a0,a1));
                case SYS_SETSOCKOPT:
                        return(sys_setsockopt(a0,
                                a1,
                                get_user(args+2),
                                (char *)get_user(args+3),
                                get_user(args+4)));
                case SYS_GETSOCKOPT:
                        return(sys_getsockopt(a0,
                                a1,
                                get_user(args+2),
                                (char *)get_user(args+3),
                                (int *)get_user(args+4)));
                case SYS_SENDMSG:
                                return sys_sendmsg(a0,
                                        (struct msghdr *) a1,
                                        get_user(args+2));
                case SYS_RECVMSG:
                                return sys_recvmsg(a0,
                                        (struct msghdr *) a1,
                                        get_user(args+2));
        }
        return -EINVAL; /* to keep gcc happy */
}
 
/*
 *      This function is called by a protocol handler that wants to
 *      advertise its address family, and have it linked into the
 *      SOCKET module.
 */
 
int sock_register(int family, struct proto_ops *ops)
{
        int i;
 
        cli();
        for(i = 0; i < NPROTO; i++)
        {
                if (pops[i] != NULL)
                        continue;
                pops[i] = ops;
                pops[i]->family = family;
                sti();
                return(i);
        }
        sti();
        return(-ENOMEM);
}
 
/*
 *      This function is called by a protocol handler that wants to
 *      remove its address family, and have it unlinked from the
 *      SOCKET module.
 */
 
int sock_unregister(int family)
{
        int i;
 
        cli();
        for(i = 0; i < NPROTO; i++)
        {
                if (pops[i] == NULL)
                        continue;
                if (pops[i]->family == family)
                {
                        pops[i]=NULL;
                        sti();
                        return(i);
                }
        }
        sti();
        return(-ENOENT);
}
 
void proto_init(void)
{
        extern struct net_proto protocols[];    /* Network protocols */
        struct net_proto *pro;
 
        /* Kick all configured protocols. */
        pro = protocols;
        while (pro->name != NULL)
        {
                (*pro->init_func)(pro);
                pro++;
        }
        /* We're all done... */
}
 
 
void sock_init(void)
{
        int i;
 
        printk(KERN_INFO "Swansea University Computer Society NET3.035 for Linux 2.0\n");
 
        /*
         *      Initialize all address (protocol) families.
         */
 
        for (i = 0; i < NPROTO; ++i) pops[i] = NULL;
 
        /*
         *      The netlink device handler may be needed early.
         */
 
#ifdef CONFIG_NETLINK
        init_netlink();
#endif           
        /*
         *      Attach the routing/device information port.
         */
 
#if defined(CONFIG_RTNETLINK)
        netlink_attach(NETLINK_ROUTE, netlink_donothing);
#endif
 
        /*
         *      Attach the firewall module if configured
         */
 
#ifdef CONFIG_FIREWALL   
        fwchain_init();
#endif
 
        /*
         *      Initialize the protocols module.
         */
 
        proto_init();
 
        /*
         *      Export networking symbols to the world.
         */
 
#if defined(CONFIG_MODULES) && defined(CONFIG_NET)
        export_net_symbols();
#endif
}
 
int socket_get_info(char *buffer, char **start, off_t offset, int length)
{
        int len = sprintf(buffer, "sockets: used %d\n", sockets_in_use);
        if (offset >= len)
        {
                *start = buffer;
                return 0;
        }
        *start = buffer + offset;
        len -= offset;
        if (len > length)
                len = length;
        return len;
}
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[/] [or1k/] [trunk/] [uclinux/] [uClinux-2.0.x/] [net/] [socket.c] - Blame information for rev 1765

Line No.	Rev	Author	Line
1	199	simons	`/*`
2			`* NET An implementation of the SOCKET network access protocol.`
3			`*`
4			`* Version: @(#)socket.c 1.1.93 18/02/95`
5			`*`
6			`* Authors: Orest Zborowski, <obz@Kodak.COM>`
7			`* Ross Biro, <bir7@leland.Stanford.Edu>`
8			`* Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>`
9			`*`
10			`* Fixes:`
11			`* Anonymous : NOTSOCK/BADF cleanup. Error fix in`
12			`* shutdown()`
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`
17			`* top level.`
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`
22			`* tty drivers).`
23			`* Niibe Yutaka : Asynchronous I/O for writes (4.4BSD style)`
24			`* Jeff Uphoff : Made max number of sockets command-line`
25			`* configurable.`
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`
34			`* stuff.`
35			`* Alan Cox : sendmsg/recvmsg basics.`
36			`* Tom Dyas : Export net symbols.`
37			`* Marcin Dalecki : Fixed problems with CONFIG_NET="n".`
38			`*`
39			`*`
40			`* This program is free software; you can redistribute it and/or`