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      1 /*	$NetBSD: net.c,v 1.5 2021/04/12 03:55:40 mrg Exp $	*/
      2 
      3 /*
      4  * Copyright (C) 1995 Wolfgang Solfrank.
      5  * Copyright (C) 1995 TooLs GmbH.
      6  * All rights reserved.
      7  *
      8  * Redistribution and use in source and binary forms, with or without
      9  * modification, are permitted provided that the following conditions
     10  * are met:
     11  * 1. Redistributions of source code must retain the above copyright
     12  *    notice, this list of conditions and the following disclaimer.
     13  * 2. Redistributions in binary form must reproduce the above copyright
     14  *    notice, this list of conditions and the following disclaimer in the
     15  *    documentation and/or other materials provided with the distribution.
     16  * 3. All advertising materials mentioning features or use of this software
     17  *    must display the following acknowledgement:
     18  *	This product includes software developed by TooLs GmbH.
     19  * 4. The name of TooLs GmbH may not be used to endorse or promote products
     20  *    derived from this software without specific prior written permission.
     21  *
     22  * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR
     23  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     24  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     25  * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     26  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
     27  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
     28  * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
     29  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
     30  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
     31  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     32  */
     33 
     34 /*
     35  * This module implements a "raw device" interface suitable for
     36  * use by the stand-alone I/O library NFS code.  This interface
     37  * does not support any "block" access, and exists only for the
     38  * purpose of initializing the network interface, getting boot
     39  * parameters, and performing the NFS mount.
     40  *
     41  * At open time, this does:
     42  *
     43  * find interface	- netif_of_open()
     44  * BOOTP		- bootp()
     45  * RPC/mountd		- nfs_mount()
     46  *
     47  * The root file handle from mountd is saved in a global
     48  * for use by the NFS open code (NFS/lookup).
     49  *
     50  * Note: this is based in part on sys/arch/sparc/stand/net.c
     51  */
     52 
     53 #include <sys/param.h>
     54 #include <sys/socket.h>
     55 
     56 #include <net/if.h>
     57 #include <netinet/in.h>
     58 #include <netinet/in_systm.h>
     59 
     60 #include <lib/libsa/stand.h>
     61 #include <lib/libsa/net.h>
     62 #include <lib/libsa/bootp.h>
     63 #include <lib/libsa/nfs.h>
     64 
     65 #include <lib/libkern/libkern.h>
     66 
     67 #include "extern.h"
     68 #include "ofdev.h"
     69 #include "netif_of.h"
     70 
     71 static	int netdev_sock = -1;
     72 static	int open_count;
     73 
     74 /*
     75  * Called by devopen after it sets f->f_dev to our devsw entry.
     76  * This opens the low-level device and sets f->f_devdata.
     77  */
     78 int
     79 net_open(struct of_dev *op)
     80 {
     81 	int error = 0;
     82 
     83 	/*
     84 	 * On first open, do netif open, mount, etc.
     85 	 */
     86 	if (open_count == 0) {
     87 		/* Find network interface. */
     88 		if ((netdev_sock = netif_of_open(op)) < 0) {
     89 			error = errno;
     90 			goto bad;
     91 		}
     92 		if ((error = net_mountroot()) != 0)
     93 			goto bad;
     94 	}
     95 	open_count++;
     96 bad:
     97 	if (netdev_sock >= 0 && open_count == 0) {
     98 		netif_of_close(netdev_sock);
     99 		netdev_sock = -1;
    100 	}
    101 	return error;
    102 }
    103 
    104 int
    105 net_close(struct of_dev *op)
    106 {
    107 	/*
    108 	 * On last close, do netif close, etc.
    109 	 */
    110 	if (open_count > 0)
    111 		if (--open_count == 0) {
    112 			netif_of_close(netdev_sock);
    113 			netdev_sock = -1;
    114 		}
    115 	return 0;
    116 }
    117 
    118 int
    119 net_mountroot(void)
    120 {
    121 
    122 #ifdef	DEBUG
    123 	printf("net_mountroot\n");
    124 #endif
    125 
    126 	/*
    127 	 * Get info for NFS boot: our IP address, out hostname,
    128 	 * server IP address, and our root path on the server.
    129 	 * We use BOOTP (RFC951, RFC1532) exclusively as mandated
    130 	 * by PowerPC Reference Platform Specification I.4.2
    131 	 */
    132 
    133 	bootp(netdev_sock);
    134 
    135 	if (myip.s_addr == 0)
    136 		return ETIMEDOUT;
    137 
    138 	printf("Using IP address: %s\n", inet_ntoa(myip));
    139 
    140 #ifdef	DEBUG
    141 	printf("myip: %s (%s)", hostname, inet_ntoa(myip));
    142 	if (gateip.s_addr)
    143 		printf(", gateip: %s", inet_ntoa(gateip));
    144 	if (netmask)
    145 		printf(", netmask: %s", intoa(netmask));
    146 	printf("\n");
    147 #endif
    148 	printf("root addr=%s path=%s\n", inet_ntoa(rootip), rootpath);
    149 
    150 	/*
    151 	 * Get the NFS file handle (mount).
    152 	 */
    153 	if (nfs_mount(netdev_sock, rootip, rootpath) < 0)
    154 		return errno;
    155 	return 0;
    156 }
    157