1 /* $NetBSD: dev_net.c,v 1.3 1995/09/23 03:42:51 gwr Exp $ */ 2 3 /* 4 * Copyright (c) 1995 Gordon W. Ross 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. The name of the author may not be used to endorse or promote products 16 * derived from this software without specific prior written permission. 17 * 4. All advertising materials mentioning features or use of this software 18 * must display the following acknowledgement: 19 * This product includes software developed by Gordon W. Ross 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 22 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 23 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 24 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 25 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 26 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 27 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 28 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 29 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 30 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 31 */ 32 33 /* 34 * This module implements a "raw device" interface suitable for 35 * use by the stand-alone I/O library NFS code. This interface 36 * does not support any "block" access, and exists only for the 37 * purpose of initializing the network interface, getting boot 38 * parameters, and performing the NFS mount. 39 * 40 * At open time, this does: 41 * 42 * find interface - netif_open() 43 * RARP for IP address - rarp_getipaddress() 44 * RPC/bootparams - callrpc(d, RPC_BOOTPARAMS, ...) 45 * RPC/mountd - nfs_mount(sock, ip, path) 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 51 #include <sys/param.h> 52 #include <sys/socket.h> 53 #include <net/if.h> 54 #include <netinet/in.h> 55 #include <netinet/if_ether.h> 56 #include <netinet/in_systm.h> 57 58 #include "stand.h" 59 #include "net.h" 60 #include "netif.h" 61 #include "bootparam.h" 62 63 extern int nfs_root_node[]; /* XXX - get from nfs_mount() */ 64 65 /* 66 * Various globals needed by the network code: 67 */ 68 69 /* for arp.c, rarp.c */ 70 u_char bcea[6] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; 71 72 struct in_addr myip; /* my ip address */ 73 struct in_addr rootip; /* root ip address */ 74 struct in_addr gateip; /* swap ip address */ 75 n_long netmask; /* subnet or net mask */ 76 77 char rootpath[FNAME_SIZE]; 78 79 int hostnamelen; 80 char hostname[FNAME_SIZE]; 81 82 int domainnamelen; 83 char domainname[FNAME_SIZE]; 84 85 /* 86 * Local things... 87 */ 88 static int netdev_sock = -1; 89 static int open_count; 90 91 /* 92 * Called by devopen after it sets f->f_dev to our devsw entry. 93 * This opens the low-level device and sets f->f_devdata. 94 */ 95 int 96 net_open(f, devname) 97 struct open_file *f; 98 char *devname; /* Device part of file name (or NULL). */ 99 { 100 int error = 0; 101 102 /* On first open, do netif open, mount, etc. */ 103 if (open_count == 0) { 104 /* Find network interface. */ 105 if ((netdev_sock = netif_open(devname)) < 0) 106 return (error=ENXIO); 107 if ((error = net_mountroot(f, devname)) != 0) 108 return (error); 109 } 110 open_count++; 111 f->f_devdata = nfs_root_node; 112 return (error); 113 } 114 115 int 116 net_close(f) 117 struct open_file *f; 118 { 119 /* On last close, do netif close, etc. */ 120 if (open_count > 0) 121 if (--open_count == 0) 122 netif_close(netdev_sock); 123 f->f_devdata = NULL; 124 } 125 126 int 127 net_ioctl() 128 { 129 return EIO; 130 } 131 132 int 133 net_strategy() 134 { 135 return EIO; 136 } 137 138 int 139 net_mountroot(f, devname) 140 struct open_file *f; 141 char *devname; /* Device part of file name (or NULL). */ 142 { 143 int error; 144 145 #ifdef DEBUG 146 printf("net_mountroot: %s\n", devname); 147 #endif 148 149 /* 150 * Get info for NFS boot: our IP address, our hostname, 151 * server IP address, and our root path on the server. 152 * There are two ways to do this: The old, Sun way, 153 * and the more modern, BOOTP way. (RFC951, RFC1048) 154 */ 155 156 #ifdef SUN_BOOTPARAMS 157 /* Get our IP address. (rarp.c) */ 158 if (rarp_getipaddress(netdev_sock)) 159 return (EIO); 160 #else /* BOOTPARAMS */ 161 /* 162 * Get boot info using BOOTP. (RFC951, RFC1048) 163 * This also gets the server IP address, gateway, 164 * root path, etc. 165 */ 166 bootp(netdev_sock); /* XXX - Error return? */ 167 #endif /* BOOTPARAMS */ 168 169 printf("boot: client addr: %s\n", inet_ntoa(myip)); 170 171 #ifdef SUN_BOOTPARAMS 172 /* Get our hostname, server IP address, gateway. */ 173 if (bp_whoami(netdev_sock)) 174 return (EIO); 175 #endif /* BOOTPARAMS */ 176 177 printf("boot: client name: %s\n", hostname); 178 if (gateip.s_addr) { 179 printf("boot: subnet mask: %s\n", intoa(netmask)); 180 printf("boot: net gateway: %s\n", inet_ntoa(gateip)); 181 } 182 183 #ifdef SUN_BOOTPARAMS 184 /* Get the root pathname. */ 185 if (bp_getfile(netdev_sock, "root", &rootip, rootpath)) 186 return (EIO); 187 #endif /* BOOTPARAMS */ 188 189 printf("boot: server addr: %s\n", inet_ntoa(rootip)); 190 printf("boot: server path: %s\n", rootpath); 191 192 /* Get the NFS file handle (mount). */ 193 error = nfs_mount(netdev_sock, rootip, rootpath); 194 195 return (error); 196 } 197