1 /* $NetBSD: dev_net.c,v 1.21 2007/10/27 12:19:41 tsutsui 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 <lib/libkern/libkern.h> 65 66 #include "stand.h" 67 #include "net.h" 68 #include "netif.h" 69 #include "nfs.h" 70 #include "bootparam.h" 71 #include "dev_net.h" 72 #ifdef SUPPORT_BOOTP 73 #include "bootp.h" 74 #endif 75 76 extern int nfs_root_node[]; /* XXX - get from nfs_mount() */ 77 78 static int netdev_sock = -1; 79 static int netdev_opens; 80 81 static int net_getparams __P((int sock)); 82 83 /* 84 * Called by devopen after it sets f->f_dev to our devsw entry. 85 * This opens the low-level device and sets f->f_devdata. 86 * This is declared with variable arguments... 87 */ 88 int 89 net_open(struct open_file *f, ...) 90 { 91 va_list ap; 92 char *devname; /* Device part of file name (or NULL). */ 93 int error = 0; 94 95 va_start(ap, f); 96 devname = va_arg(ap, char*); 97 va_end(ap); 98 99 #ifdef NETIF_DEBUG 100 if (debug) 101 printf("%s\n", devname); 102 #endif 103 104 /* On first open, do netif open, mount, etc. */ 105 if (netdev_opens == 0) { 106 /* Find network interface. */ 107 if (netdev_sock < 0) { 108 netdev_sock = netif_open(devname); 109 if (netdev_sock < 0) { 110 printf("netif_open() failed\n"); 111 return (ENXIO); 112 } 113 #ifdef NETIF_DEBUG 114 if (debug) 115 printf("netif_open() succeeded\n"); 116 #endif 117 } 118 if (rootip.s_addr == 0) { 119 /* Get root IP address, and path, etc. */ 120 error = net_getparams(netdev_sock); 121 if (error) { 122 /* getparams makes its own noise */ 123 goto fail; 124 } 125 /* Get the NFS file handle (mountd). */ 126 error = nfs_mount(netdev_sock, rootip, rootpath); 127 if (error) { 128 printf("NFS mount error=%d\n", error); 129 rootip.s_addr = 0; 130 fail: 131 netif_close(netdev_sock); 132 netdev_sock = -1; 133 return (error); 134 } 135 #ifdef NETIF_DEBUG 136 if (debug) 137 printf("NFS mount succeeded\n"); 138 #endif 139 } 140 } 141 netdev_opens++; 142 f->f_devdata = nfs_root_node; 143 return (error); 144 } 145 146 int 147 net_close(f) 148 struct open_file *f; 149 { 150 151 #ifdef NETIF_DEBUG 152 if (debug) 153 printf("net_close: opens=%d\n", netdev_opens); 154 #endif 155 156 /* On last close, do netif close, etc. */ 157 f->f_devdata = NULL; 158 /* Extra close call? */ 159 if (netdev_opens <= 0) 160 return (0); 161 netdev_opens--; 162 /* Not last close? */ 163 if (netdev_opens > 0) 164 return(0); 165 rootip.s_addr = 0; 166 if (netdev_sock >= 0) { 167 #ifdef NETIF_DEBUG 168 if (debug) 169 printf("net_close: calling netif_close()\n"); 170 #endif 171 netif_close(netdev_sock); 172 netdev_sock = -1; 173 } 174 return (0); 175 } 176 177 int 178 net_ioctl(f, cmd, data) 179 struct open_file *f; 180 u_long cmd; 181 void *data; 182 { 183 return EIO; 184 } 185 186 int 187 net_strategy(devdata, rw, blk, size, buf, rsize) 188 void *devdata; 189 int rw; 190 daddr_t blk; 191 size_t size; 192 void *buf; 193 size_t *rsize; 194 { 195 return EIO; 196 } 197 198 199 /* 200 * Get info for NFS boot: our IP address, our hostname, 201 * server IP address, and our root path on the server. 202 * There are two ways to do this: The old, Sun way, 203 * and the more modern, BOOTP way. (RFC951, RFC1048) 204 * 205 * The default is to use the Sun bootparams RPC 206 * (because that is what the kernel will do). 207 * MD code can make try_bootp initialied data, 208 * which will override this common definition. 209 */ 210 #ifdef SUPPORT_BOOTP 211 int try_bootp; 212 #endif 213 214 static int 215 net_getparams(sock) 216 int sock; 217 { 218 char buf[MAXHOSTNAMELEN]; 219 n_long smask; 220 221 #ifdef SUPPORT_BOOTP 222 /* 223 * Try to get boot info using BOOTP. If we succeed, then 224 * the server IP address, gateway, and root path will all 225 * be initialized. If any remain uninitialized, we will 226 * use RARP and RPC/bootparam (the Sun way) to get them. 227 */ 228 if (try_bootp) 229 bootp(sock); 230 if (myip.s_addr != 0) 231 return (0); 232 #ifdef NETIF_DEBUG 233 if (debug) 234 printf("BOOTP failed, trying RARP/RPC...\n"); 235 #endif 236 #endif 237 238 /* 239 * Use RARP to get our IP address. This also sets our 240 * netmask to the "natural" default for our address. 241 */ 242 if (rarp_getipaddress(sock)) { 243 printf("RARP failed\n"); 244 return (EIO); 245 } 246 #ifdef NETIF_DEBUG 247 if (debug) 248 printf("client addr: %s\n", inet_ntoa(myip)); 249 #endif 250 251 /* Get our hostname, server IP address, gateway. */ 252 if (bp_whoami(sock)) { 253 printf("bootparam/whoami RPC failed\n"); 254 return (EIO); 255 } 256 #ifdef NETIF_DEBUG 257 if (debug) 258 printf("client name: %s\n", hostname); 259 #endif 260 261 /* 262 * Ignore the gateway from whoami (unreliable). 263 * Use the "gateway" parameter instead. 264 */ 265 smask = 0; 266 gateip.s_addr = 0; 267 if (bp_getfile(sock, "gateway", &gateip, buf)) 268 printf("nfs_open: gateway bootparam missing\n"); 269 else { 270 /* Got it! Parse the netmask. */ 271 smask = inet_addr(buf); 272 } 273 if (smask) { 274 netmask = smask; 275 #ifdef NETIF_DEBUG 276 if (debug) 277 printf("subnet mask: %s\n", intoa(netmask)); 278 #endif 279 } 280 #ifdef NETIF_DEBUG 281 if (debug) 282 if (gateip.s_addr) 283 printf("net gateway: %s\n", inet_ntoa(gateip)); 284 #endif 285 286 /* Get the root server and pathname. */ 287 if (bp_getfile(sock, "root", &rootip, rootpath)) { 288 printf("bootparam/getfile RPC failed\n"); 289 return (EIO); 290 } 291 292 #ifdef NETIF_DEBUG 293 if (debug) { 294 printf("server addr: %s\n", inet_ntoa(rootip)); 295 printf("server path: %s\n", rootpath); 296 } 297 #endif 298 299 return (0); 300 } 301