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      1 /*	$NetBSD: net.c,v 1.10 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 "net.h"
     54 
     55 #include <sys/param.h>
     56 #include <sys/socket.h>
     57 
     58 #include <net/if.h>
     59 #include <netinet/in.h>
     60 #include <netinet/in_systm.h>
     61 
     62 #include <lib/libsa/stand.h>
     63 #include <lib/libsa/bootp.h>
     64 #include <lib/libsa/net.h>
     65 #include <lib/libsa/nfs.h>
     66 
     67 #include <lib/libkern/libkern.h>
     68 
     69 #include "ofdev.h"
     70 #include "netif_of.h"
     71 
     72 static	int netdev_sock = -1;
     73 static	int open_count;
     74 
     75 static int net_mountroot(void);
     76 
     77 /*
     78  * Called by devopen after it sets f->f_dev to our devsw entry.
     79  * This opens the low-level device and sets f->f_devdata.
     80  */
     81 int
     82 net_open(struct of_dev *op)
     83 {
     84 	int error = 0;
     85 
     86 	/*
     87 	 * On first open, do netif open, mount, etc.
     88 	 */
     89 	if (open_count == 0) {
     90 		/* Find network interface. */
     91 		if ((netdev_sock = netif_of_open(op)) < 0) {
     92 			error = errno;
     93 			goto bad;
     94 		}
     95 		if ((error = net_mountroot()) != 0)
     96 			goto bad;
     97 	}
     98 	open_count++;
     99 bad:
    100 	if (netdev_sock >= 0 && open_count == 0) {
    101 		netif_of_close(netdev_sock);
    102 		netdev_sock = -1;
    103 	}
    104 	return error;
    105 }
    106 
    107 int
    108 net_close(struct of_dev *op)
    109 {
    110 	/*
    111 	 * On last close, do netif close, etc.
    112 	 */
    113 	if (open_count > 0)
    114 		if (--open_count == 0) {
    115 			netif_of_close(netdev_sock);
    116 			netdev_sock = -1;
    117 		}
    118 	return 0;
    119 }
    120 
    121 static int
    122 net_mountroot(void)
    123 {
    124 
    125 #ifdef	DEBUG
    126 	printf("net_mountroot\n");
    127 #endif
    128 
    129 	/*
    130 	 * Get info for NFS boot: our IP address, out hostname,
    131 	 * server IP address, and our root path on the server.
    132 	 * We use BOOTP (RFC951, RFC1532) exclusively as mandated
    133 	 * by PowerPC Reference Platform Specification I.4.2
    134 	 */
    135 
    136 	bootp(netdev_sock);
    137 
    138 	if (myip.s_addr == 0)
    139 		return ETIMEDOUT;
    140 
    141 	printf("Using IP address: %s\n", inet_ntoa(myip));
    142 
    143 #ifdef	DEBUG
    144 	printf("myip: %s (%s)", hostname, inet_ntoa(myip));
    145 	if (gateip.s_addr)
    146 		printf(", gateip: %s", inet_ntoa(gateip));
    147 	if (netmask)
    148 		printf(", netmask: %s", intoa(netmask));
    149 	printf("\n");
    150 #endif
    151 	printf("root addr=%s path=%s\n", inet_ntoa(rootip), rootpath);
    152 
    153 	/*
    154 	 * Get the NFS file handle (mount).
    155 	 */
    156 	if (nfs_mount(netdev_sock, rootip, rootpath) < 0)
    157 		return errno;
    158 	return 0;
    159 }
    160