usr/src/boot/sys/boot/common/dev_net.c

/*	$NetBSD: dev_net.c,v 1.23 2008/04/28 20:24:06 martin Exp $	*/

/*-
 * Copyright (c) 1997 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Gordon W. Ross.
 *
 * 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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
 * ``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 FOUNDATION OR CONTRIBUTORS
 * 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.
 */

#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");

/*-
 * 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 <machine/stdarg.h>
#include <sys/param.h>
#include <sys/socket.h>
#include <net/if.h>
#include <netinet/in.h>
#include <netinet/in_systm.h>

#include <stand.h>
#include <string.h>
#include <net.h>
#include <netif.h>
#include <bootp.h>
#include <bootparam.h>

#include "dev_net.h"
#include "bootstrap.h"

#ifdef	NETIF_DEBUG
int debug = 0;
#endif

static char *netdev_name;
static int netdev_sock = -1;
static int netdev_opens;

static int	net_init(void);
static int	net_open(struct open_file *, ...);
static int	net_close(struct open_file *);
static void	net_cleanup(void);
static int	net_strategy();
static int	net_print(int);

static int net_getparams(int sock);

struct devsw netdev = {
	"net",
	DEVT_NET,
	net_init,
	net_strategy,
	net_open,
	net_close,
	noioctl,
	net_print,
	net_cleanup
};

static int
net_init(void)
{

	return (0);
}

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

	va_start(args, f);
	devname = va_arg(args, char*);
	va_end(args);

#ifdef	NETIF_OPEN_CLOSE_ONCE
	/* Before opening another interface, close the previous one first. */
	if (netdev_sock >= 0 && strcmp(devname, netdev_name) != 0)
		net_cleanup();
#endif

	/* On first open, do netif open, mount, etc. */
	if (netdev_opens == 0) {
		/* Find network interface. */
		if (netdev_sock < 0) {
			netdev_sock = netif_open(devname);
			if (netdev_sock < 0) {
				printf("net_open: netif_open() failed\n");
				return (ENXIO);
			}
			netdev_name = strdup(devname);
#ifdef	NETIF_DEBUG
			if (debug)
				printf("net_open: netif_open() succeeded\n");
#endif
		}
		/*
		 * If network params were not set by netif_open(), try to get
		 * them via bootp, rarp, etc.
		 */
		if (rootip.s_addr == 0) {
			/* Get root IP address, and path, etc. */
			error = net_getparams(netdev_sock);
			if (error) {
				/* getparams makes its own noise */
				free(netdev_name);
				netif_close(netdev_sock);
				netdev_sock = -1;
				return (error);
			}
		}
		/*
		 * Set the variables required by the kernel's nfs_diskless
		 * mechanism.  This is the minimum set of variables required to
		 * mount a root filesystem without needing to obtain additional
		 * info from bootp or other sources.
		 */
		d = socktodesc(netdev_sock);
		setenv("boot.netif.hwaddr", ether_sprintf(d->myea), 1);
		setenv("boot.netif.ip", inet_ntoa(myip), 1);
		setenv("boot.netif.netmask", intoa(netmask), 1);
		setenv("boot.netif.gateway", inet_ntoa(gateip), 1);
		setenv("boot.nfsroot.server", inet_ntoa(rootip), 1);
		setenv("boot.nfsroot.path", rootpath, 1);
	}
	netdev_opens++;
	f->f_devdata = &netdev_sock;
	return (error);
}

static int
net_close(struct open_file *f)
{

#ifdef	NETIF_DEBUG
	if (debug)
		printf("net_close: opens=%d\n", netdev_opens);
#endif

	f->f_devdata = NULL;

#ifndef	NETIF_OPEN_CLOSE_ONCE
	/* Extra close call? */
	if (netdev_opens <= 0)
		return (0);
	netdev_opens--;
	/* Not last close? */
	if (netdev_opens > 0)
		return (0);
	/* On last close, do netif close, etc. */
#ifdef	NETIF_DEBUG
	if (debug)
		printf("net_close: calling net_cleanup()\n");
#endif
	net_cleanup();
#endif
	return (0);
}

static void
net_cleanup(void)
{

	if (netdev_sock >= 0) {
#ifdef	NETIF_DEBUG
		if (debug)
			printf("net_cleanup: calling netif_close()\n");
#endif
		rootip.s_addr = 0;
		free(netdev_name);
		netif_close(netdev_sock);
		netdev_sock = -1;
	}
}

static int
net_strategy()
{

	return (EIO);
}

#define SUPPORT_BOOTP

/*
 * 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)
 *
 * The default is to use the Sun bootparams RPC
 * (because that is what the kernel will do).
 * MD code can make try_bootp initialied data,
 * which will override this common definition.
 */
#ifdef	SUPPORT_BOOTP
int try_bootp = 1;
#endif

extern n_long ip_convertaddr(char *p);

static int
net_getparams(int sock)
{
	char buf[MAXHOSTNAMELEN];
	n_long rootaddr, smask;

#ifdef	SUPPORT_BOOTP
	/*
	 * Try to get boot info using BOOTP.  If we succeed, then
	 * the server IP address, gateway, and root path will all
	 * be initialized.  If any remain uninitialized, we will
	 * use RARP and RPC/bootparam (the Sun way) to get them.
	 */
	if (try_bootp)
		bootp(sock, BOOTP_NONE);
	if (myip.s_addr != 0)
		goto exit;
#ifdef	NETIF_DEBUG
	if (debug)
		printf("net_open: BOOTP failed, trying RARP/RPC...\n");
#endif
#endif

	/*
	 * Use RARP to get our IP address.  This also sets our
	 * netmask to the "natural" default for our address.
	 */
	if (rarp_getipaddress(sock)) {
		printf("net_open: RARP failed\n");
		return (EIO);
	}
	printf("net_open: client addr: %s\n", inet_ntoa(myip));

	/* Get our hostname, server IP address, gateway. */
	if (bp_whoami(sock)) {
		printf("net_open: bootparam/whoami RPC failed\n");
		return (EIO);
	}
#ifdef	NETIF_DEBUG
	if (debug)
		printf("net_open: client name: %s\n", hostname);
#endif

	/*
	 * Ignore the gateway from whoami (unreliable).
	 * Use the "gateway" parameter instead.
	 */
	smask = 0;
	gateip.s_addr = 0;
	if (bp_getfile(sock, "gateway", &gateip, buf) == 0) {
		/* Got it!  Parse the netmask. */
		smask = ip_convertaddr(buf);
	}
	if (smask) {
		netmask = smask;
#ifdef	NETIF_DEBUG
		if (debug)
			printf("net_open: subnet mask: %s\n", intoa(netmask));
#endif
	}
#ifdef	NETIF_DEBUG
	if (gateip.s_addr && debug)
		printf("net_open: net gateway: %s\n", inet_ntoa(gateip));
#endif

	/* Get the root server and pathname. */
	if (bp_getfile(sock, "root", &rootip, rootpath)) {
		printf("net_open: bootparam/getfile RPC failed\n");
		return (EIO);
	}
exit:
	if ((rootaddr = net_parse_rootpath()) != INADDR_NONE)
		rootip.s_addr = rootaddr;

#ifdef	NETIF_DEBUG
	if (debug) {
		printf("net_open: server addr: %s\n", inet_ntoa(rootip));
		printf("net_open: server path: %s\n", rootpath);
	}
#endif

	return (0);
}

static int
net_print(int verbose)
{
	struct netif_driver *drv;
	char line[80];
	int i, d, cnt;
	int ret = 0;

	cnt = 0;
	for (d = 0; netif_drivers[d]; d++) {
		drv = netif_drivers[d];
		for (i = 0; i < drv->netif_nifs; i++) {
			snprintf(line, 80, "\t%s%d:", "net", cnt++);
			ret = pager_output(line);
			if (ret != 0)
				break;
			if (verbose) {
				snprintf(line, 80, " (%s%d)", drv->netif_bname,
				    drv->netif_ifs[i].dif_unit);
				ret = pager_output(line);
				if (ret != 0)
					break;
			}
		}
	}
	return (ret |= pager_output("\n"));
}

/*
 * Strip the server's address off of the rootpath if present and return it in
 * network byte order, leaving just the pathname part in the global rootpath.
 */
uint32_t
net_parse_rootpath()
{
	int i;
	n_long addr = INADDR_NONE;

	for (i = 0; rootpath[i] != '\0' && i < FNAME_SIZE; i++)
		if (rootpath[i] == ':')
			break;
	if (i && i != FNAME_SIZE && rootpath[i] == ':') {
		rootpath[i++] = '\0';
		addr = inet_addr(&rootpath[0]);
		bcopy(&rootpath[i], rootpath, strlen(&rootpath[i])+1);
	}
	return (addr);
}