1 /* $NetBSD: dev_net.c,v 1.12 1997/12/10 20:38:37 gwr Exp $ */ 2 3 /*- 4 * Copyright (c) 1997 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Gordon W. Ross. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the NetBSD 21 * Foundation, Inc. and its contributors. 22 * 4. Neither the name of The NetBSD Foundation nor the names of its 23 * contributors may be used to endorse or promote products derived 24 * from this software without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 29 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 * POSSIBILITY OF SUCH DAMAGE. 37 */ 38 39 /* 40 * This module implements a "raw device" interface suitable for 41 * use by the stand-alone I/O library NFS code. This interface 42 * does not support any "block" access, and exists only for the 43 * purpose of initializing the network interface, getting boot 44 * parameters, and performing the NFS mount. 45 * 46 * At open time, this does: 47 * 48 * find interface - netif_open() 49 * RARP for IP address - rarp_getipaddress() 50 * RPC/bootparams - callrpc(d, RPC_BOOTPARAMS, ...) 51 * RPC/mountd - nfs_mount(sock, ip, path) 52 * 53 * the root file handle from mountd is saved in a global 54 * for use by the NFS open code (NFS/lookup). 55 */ 56 57 #include <machine/stdarg.h> 58 #include <sys/param.h> 59 #include <sys/socket.h> 60 #include <net/if.h> 61 #include <netinet/in.h> 62 #include <netinet/in_systm.h> 63 64 #include "stand.h" 65 #include "net.h" 66 #include "netif.h" 67 #include "nfs.h" 68 #include "bootparam.h" 69 #include "dev_net.h" 70 71 extern int nfs_root_node[]; /* XXX - get from nfs_mount() */ 72 73 static int netdev_sock = -1; 74 static int netdev_opens; 75 76 static int net_getparams __P((int sock)); 77 78 /* 79 * Called by devopen after it sets f->f_dev to our devsw entry. 80 * This opens the low-level device and sets f->f_devdata. 81 * This is declared with variable arguments... 82 */ 83 int 84 net_open(struct open_file *f, ...) 85 { 86 va_list ap; 87 char *devname; /* Device part of file name (or NULL). */ 88 int error = 0; 89 90 va_start(ap, f); 91 devname = va_arg(ap, char*); 92 va_end(ap); 93 94 #ifdef NETIF_DEBUG 95 if (debug) 96 printf("net_open: %s\n", devname); 97 #endif 98 99 /* On first open, do netif open, mount, etc. */ 100 if (netdev_opens == 0) { 101 /* Find network interface. */ 102 if (netdev_sock < 0) { 103 netdev_sock = netif_open(devname); 104 if (netdev_sock < 0) { 105 printf("net_open: netif_open() failed\n"); 106 return (ENXIO); 107 } 108 if (debug) 109 printf("net_open: netif_open() succeeded\n"); 110 } 111 if (rootip.s_addr == 0) { 112 /* Get root IP address, and path, etc. */ 113 error = net_getparams(netdev_sock); 114 if (error) { 115 /* getparams makes its own noise */ 116 goto fail; 117 } 118 /* Get the NFS file handle (mountd). */ 119 error = nfs_mount(netdev_sock, rootip, rootpath); 120 if (error) { 121 printf("net_open: NFS mount error=%d\n", error); 122 rootip.s_addr = 0; 123 fail: 124 netif_close(netdev_sock); 125 netdev_sock = -1; 126 return (error); 127 } 128 if (debug) 129 printf("net_open: NFS mount succeeded\n"); 130 } 131 } 132 netdev_opens++; 133 f->f_devdata = nfs_root_node; 134 return (error); 135 } 136 137 int 138 net_close(f) 139 struct open_file *f; 140 { 141 142 #ifdef NETIF_DEBUG 143 if (debug) 144 printf("net_close: opens=%d\n", netdev_opens); 145 #endif 146 147 /* On last close, do netif close, etc. */ 148 f->f_devdata = NULL; 149 /* Extra close call? */ 150 if (netdev_opens <= 0) 151 return (0); 152 netdev_opens--; 153 /* Not last close? */ 154 if (netdev_opens > 0) 155 return(0); 156 rootip.s_addr = 0; 157 if (netdev_sock >= 0) { 158 if (debug) 159 printf("net_close: calling netif_close()\n"); 160 netif_close(netdev_sock); 161 netdev_sock = -1; 162 } 163 return (0); 164 } 165 166 int 167 net_ioctl() 168 { 169 return EIO; 170 } 171 172 int 173 net_strategy() 174 { 175 return EIO; 176 } 177 178 179 /* 180 * Get info for NFS boot: our IP address, our hostname, 181 * server IP address, and our root path on the server. 182 * There are two ways to do this: The old, Sun way, 183 * and the more modern, BOOTP way. (RFC951, RFC1048) 184 * 185 * The default is to use the Sun bootparams RPC 186 * (because that is what the kernel will do). 187 * MD code can make try_bootp initialied data, 188 * which will override this common definition. 189 */ 190 #ifdef SUPPORT_BOOTP 191 int try_bootp; 192 int bootp __P((int sock)); 193 #endif 194 195 static int 196 net_getparams(sock) 197 int sock; 198 { 199 char buf[MAXHOSTNAMELEN]; 200 n_long smask; 201 202 #ifdef SUPPORT_BOOTP 203 /* 204 * Try to get boot info using BOOTP. If we succeed, then 205 * the server IP address, gateway, and root path will all 206 * be initialized. If any remain uninitialized, we will 207 * use RARP and RPC/bootparam (the Sun way) to get them. 208 */ 209 if (try_bootp) 210 bootp(sock); 211 if (myip.s_addr != 0) 212 return (0); 213 if (debug) 214 printf("net_open: BOOTP failed, trying RARP/RPC...\n"); 215 #endif 216 217 /* 218 * Use RARP to get our IP address. This also sets our 219 * netmask to the "natural" default for our address. 220 */ 221 if (rarp_getipaddress(sock)) { 222 printf("net_open: RARP failed\n"); 223 return (EIO); 224 } 225 printf("net_open: client addr: %s\n", inet_ntoa(myip)); 226 227 /* Get our hostname, server IP address, gateway. */ 228 if (bp_whoami(sock)) { 229 printf("net_open: bootparam/whoami RPC failed\n"); 230 return (EIO); 231 } 232 printf("net_open: client name: %s\n", hostname); 233 234 /* 235 * Ignore the gateway from whoami (unreliable). 236 * Use the "gateway" parameter instead. 237 */ 238 smask = 0; 239 gateip.s_addr = 0; 240 if (bp_getfile(sock, "gateway", &gateip, buf) == 0) { 241 /* Got it! Parse the netmask. */ 242 smask = ip_convertaddr(buf); 243 } 244 if (smask) { 245 netmask = smask; 246 printf("net_open: subnet mask: %s\n", intoa(netmask)); 247 } 248 if (gateip.s_addr) 249 printf("net_open: net gateway: %s\n", inet_ntoa(gateip)); 250 251 /* Get the root server and pathname. */ 252 if (bp_getfile(sock, "root", &rootip, rootpath)) { 253 printf("net_open: bootparam/getfile RPC failed\n"); 254 return (EIO); 255 } 256 257 printf("net_open: server addr: %s\n", inet_ntoa(rootip)); 258 printf("net_open: server path: %s\n", rootpath); 259 260 return (0); 261 } 262