NetBSD/sys/lib/libsa/dev_net.c

/*	$NetBSD: dev_net.c,v 1.3 1995/09/23 03:42:51 gwr Exp $	*/

/*
 * Copyright (c) 1995 Gordon W. Ross
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 * 4. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by Gordon W. Ross
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/*
 * This module implements a "raw device" interface suitable for
 * use by the stand-alone I/O library NFS code.  This interface
 * does not support any "block" access, and exists only for the
 * purpose of initializing the network interface, getting boot
 * parameters, and performing the NFS mount.
 *
 * At open time, this does:
 *
 * find interface      - netif_open()
 * RARP for IP address - rarp_getipaddress()
 * RPC/bootparams      - callrpc(d, RPC_BOOTPARAMS, ...)
 * RPC/mountd          - nfs_mount(sock, ip, path)
 *
 * the root file handle from mountd is saved in a global
 * for use by the NFS open code (NFS/lookup).
 */

#include <sys/param.h>
#include <sys/socket.h>
#include <net/if.h>
#include <netinet/in.h>
#include <netinet/if_ether.h>
#include <netinet/in_systm.h>

#include "stand.h"
#include "net.h"
#include "netif.h"
#include "bootparam.h"

extern int nfs_root_node[];	/* XXX - get from nfs_mount() */

/*
 * Various globals needed by the network code:
 */

/* for arp.c, rarp.c */
u_char bcea[6] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };

struct	in_addr myip;		/* my ip address */
struct	in_addr rootip;		/* root ip address */
struct	in_addr gateip;		/* swap ip address */
n_long	netmask;		/* subnet or net mask */

char rootpath[FNAME_SIZE];

int hostnamelen;
char hostname[FNAME_SIZE];

int domainnamelen;
char domainname[FNAME_SIZE];

/*
 * Local things...
 */
static int netdev_sock = -1;
static int open_count;

/*
 * Called by devopen after it sets f->f_dev to our devsw entry.
 * This opens the low-level device and sets f->f_devdata.
 */
int
net_open(f, devname)
	struct open_file *f;
	char *devname;		/* Device part of file name (or NULL). */
{
	int error = 0;

	/* On first open, do netif open, mount, etc. */
	if (open_count == 0) {
		/* Find network interface. */
		if ((netdev_sock = netif_open(devname)) < 0)
			return (error=ENXIO);
		if ((error = net_mountroot(f, devname)) != 0)
			return (error);
	}
	open_count++;
	f->f_devdata = nfs_root_node;
	return (error);
}

int
net_close(f)
	struct open_file *f;
{
	/* On last close, do netif close, etc. */
	if (open_count > 0)
		if (--open_count == 0)
			netif_close(netdev_sock);
	f->f_devdata = NULL;
}

int
net_ioctl()
{
	return EIO;
}

int
net_strategy()
{
	return EIO;
}

int
net_mountroot(f, devname)
	struct open_file *f;
	char *devname;		/* Device part of file name (or NULL). */
{
	int error;

#ifdef DEBUG
	printf("net_mountroot: %s\n", devname);
#endif

	/*
	 * Get info for NFS boot: our IP address, our hostname,
	 * server IP address, and our root path on the server.
	 * There are two ways to do this:  The old, Sun way,
	 * and the more modern, BOOTP way. (RFC951, RFC1048)
	 */

#ifdef	SUN_BOOTPARAMS
	/* Get our IP address.  (rarp.c) */
	if (rarp_getipaddress(netdev_sock))
		return (EIO);
#else	/* BOOTPARAMS */
	/*
	 * Get boot info using BOOTP. (RFC951, RFC1048)
	 * This also gets the server IP address, gateway,
	 * root path, etc.
	 */
	bootp(netdev_sock);	/* XXX - Error return? */
#endif	/* BOOTPARAMS */

	printf("boot: client addr: %s\n", inet_ntoa(myip));

#ifdef	SUN_BOOTPARAMS
	/* Get our hostname, server IP address, gateway. */
	if (bp_whoami(netdev_sock))
		return (EIO);
#endif	/* BOOTPARAMS */

	printf("boot: client name: %s\n", hostname);
	if (gateip.s_addr) {
		printf("boot: subnet mask: %s\n", intoa(netmask));
		printf("boot: net gateway: %s\n", inet_ntoa(gateip));
	}

#ifdef	SUN_BOOTPARAMS
	/* Get the root pathname. */
	if (bp_getfile(netdev_sock, "root", &rootip, rootpath))
		return (EIO);
#endif	/* BOOTPARAMS */

	printf("boot: server addr: %s\n", inet_ntoa(rootip));
	printf("boot: server path: %s\n", rootpath);

	/* Get the NFS file handle (mount). */
	error = nfs_mount(netdev_sock, rootip, rootpath);

	return (error);
}