/*      $NetBSD: net.c,v 1.11 2021/04/12 03:55:40 mrg 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.
 *
 * 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/in_systm.h>

#include <lib/libsa/stand.h>
#include <lib/libsa/net.h>
#include <lib/libsa/netif.h>
#include <lib/libsa/bootparam.h>
#include <lib/libsa/bootp.h>
#include <lib/libsa/nfs.h>

#include <lib/libkern/libkern.h>

#include <sparc/stand/common/promdev.h>

int     netdev_sock = -1;
static  int open_count;

static int net_mountroot_bootparams(void);
static int net_mountroot_bootp(void);

/*
 * 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(struct promdata *pd)
{
        int error = 0;

        /* On first open, do netif open, mount, etc. */
        if (open_count == 0) {
                /* Find network interface. */
                if ((netdev_sock = netif_open(pd)) < 0) {
                        error = errno;
                        goto bad;
                }
                if ((error = net_mountroot()) != 0)
                        goto bad;
        }
        open_count++;
bad:
        return (error);
}

int
net_close(struct promdata *pd)
{
        /* On last close, do netif close, etc. */
        if (open_count <= 0)
                return (0);

        if (--open_count == 0)
                return (netif_close(netdev_sock));

        return (0);
}

int
net_mountroot_bootparams(void)
{
        printf("Trying BOOTPARAMS protocol... ");

        /* Get our IP address.  (rarp.c) */
        if (rarp_getipaddress(netdev_sock) == -1)
                return (errno);

        printf("ip address: %s", inet_ntoa(myip));

        /* Get our hostname, server IP address. */
        if (bp_whoami(netdev_sock))
                return (errno);

        printf(", hostname: %s\n", hostname);

        /* Get the root pathname. */
        if (bp_getfile(netdev_sock, "root", &rootip, rootpath))
                return (errno);

        return (0);
}

int
net_mountroot_bootp(void)
{
        printf("Trying BOOTP protocol... ");

        bootp(netdev_sock);

        if (myip.s_addr == 0)
                return(ENOENT);

        printf("ip address: %s", inet_ntoa(myip));

        if (hostname[0])
                printf(", hostname: %s", hostname);
        if (netmask)
                printf(", netmask: %s", intoa(netmask));
        if (gateip.s_addr)
                printf(", gateway: %s", inet_ntoa(gateip));
        printf("\n");

        return (0);
}

int
net_mountroot(void)
{
        int error;

#ifdef DEBUG
        printf("net_mountroot\n");
#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)
         */

        /* Try BOOTP first */
        error = net_mountroot_bootp();
        /* Historically, we've used BOOTPARAMS, so try that next */
        if (error != 0)
                error = net_mountroot_bootparams();
        if (error != 0)
                return (error);

        printf("root addr=%s path=%s\n", inet_ntoa(rootip), rootpath);

        /* Get the NFS file handle (mount). */
        if (nfs_mount(netdev_sock, rootip, rootpath) != 0)
                return (errno);

        return (0);
}