NetBSD-5.0.2/sys/lib/libsa/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.
*/
/*
* 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 <lib/libkern/libkern.h>
#include "stand.h"
#include "net.h"
#include "netif.h"
#include "nfs.h"
#include "bootparam.h"
#include "dev_net.h"
#ifdef SUPPORT_BOOTP
#include "bootp.h"
#endif
extern int nfs_root_node[]; /* XXX - get from nfs_mount() */
static int netdev_sock = -1;
static int netdev_opens;
static int net_getparams __P((int));
/*
* 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...
*/
int
net_open(struct open_file *f, ...)
{
va_list ap;
char *devname; /* Device part of file name (or NULL). */
int error = 0;
va_start(ap, f);
devname = va_arg(ap, char *);
va_end(ap);
#ifdef NETIF_DEBUG
if (debug)
printf("%s\n", devname);
#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("netif_open() failed\n");
return ENXIO;
}
#ifdef NETIF_DEBUG
if (debug)
printf("netif_open() succeeded\n");
#endif
}
if (rootip.s_addr == 0) {
/* Get root IP address, and path, etc. */
error = net_getparams(netdev_sock);
if (error) {
/* getparams makes its own noise */
goto fail;
}
/* Get the NFS file handle (mountd). */
error = nfs_mount(netdev_sock, rootip, rootpath);
if (error) {
printf("NFS mount error=%d\n", error);
rootip.s_addr = 0;
fail:
netif_close(netdev_sock);
netdev_sock = -1;
return error;
}
#ifdef NETIF_DEBUG
if (debug)
printf("NFS mount succeeded\n");
#endif
}
}
netdev_opens++;
f->f_devdata = nfs_root_node;
return error;
}
int
net_close(struct open_file *f)
{
#ifdef NETIF_DEBUG
if (debug)
printf("net_close: opens=%d\n", netdev_opens);
#endif
/* On last close, do netif close, etc. */
f->f_devdata = NULL;
/* Extra close call? */
if (netdev_opens <= 0)
return 0;
netdev_opens--;
/* Not last close? */
if (netdev_opens > 0)
return 0;
rootip.s_addr = 0;
if (netdev_sock >= 0) {
#ifdef NETIF_DEBUG
if (debug)
printf("net_close: calling netif_close()\n");
#endif
netif_close(netdev_sock);
netdev_sock = -1;
}
return 0;
}
int
net_ioctl(struct open_file *f, u_long cmd, void *data)
{
return EIO;
}
int
net_strategy(void *devdata, int rw, daddr_t blk, size_t size, void *buf,
size_t *rsize)
{
return EIO;
}
/*
* 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;
#endif
static int
net_getparams(int sock)
{
char buf[MAXHOSTNAMELEN];
n_long 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);
if (myip.s_addr != 0)
return 0;
#ifdef NETIF_DEBUG
if (debug)
printf("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("RARP failed\n");
return EIO;
}
#ifdef NETIF_DEBUG
if (debug)
printf("client addr: %s\n", inet_ntoa(myip));
#endif
/* Get our hostname, server IP address, gateway. */
if (bp_whoami(sock)) {
printf("bootparam/whoami RPC failed\n");
return EIO;
}
#ifdef NETIF_DEBUG
if (debug)
printf("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)) {
printf("nfs_open: gateway bootparam missing\n");
} else {
/* Got it! Parse the netmask. */
smask = inet_addr(buf);
}
if (smask) {
netmask = smask;
#ifdef NETIF_DEBUG
if (debug)
printf("subnet mask: %s\n", intoa(netmask));
#endif
}
#ifdef NETIF_DEBUG
if (debug)
if (gateip.s_addr)
printf("net gateway: %s\n", inet_ntoa(gateip));
#endif
/* Get the root server and pathname. */
if (bp_getfile(sock, "root", &rootip, rootpath)) {
printf("bootparam/getfile RPC failed\n");
return EIO;
}
#ifdef NETIF_DEBUG
if (debug) {
printf("server addr: %s\n", inet_ntoa(rootip));
printf("server path: %s\n", rootpath);
}
#endif
return 0;
}