1 /* $NetBSD: dev_net.c,v 1.22 2007/11/24 13:20:54 isaki 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)); 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(struct open_file *f) 148 { 149 150 #ifdef NETIF_DEBUG 151 if (debug) 152 printf("net_close: opens=%d\n", netdev_opens); 153 #endif 154 155 /* On last close, do netif close, etc. */ 156 f->f_devdata = NULL; 157 /* Extra close call? */ 158 if (netdev_opens <= 0) 159 return 0; 160 netdev_opens--; 161 /* Not last close? */ 162 if (netdev_opens > 0) 163 return 0; 164 rootip.s_addr = 0; 165 if (netdev_sock >= 0) { 166 #ifdef NETIF_DEBUG 167 if (debug) 168 printf("net_close: calling netif_close()\n"); 169 #endif 170 netif_close(netdev_sock); 171 netdev_sock = -1; 172 } 173 return 0; 174 } 175 176 int 177 net_ioctl(struct open_file *f, u_long cmd, void *data) 178 { 179 180 return EIO; 181 } 182 183 int 184 net_strategy(void *devdata, int rw, daddr_t blk, size_t size, void *buf, 185 size_t *rsize) 186 { 187 188 return EIO; 189 } 190 191 192 /* 193 * Get info for NFS boot: our IP address, our hostname, 194 * server IP address, and our root path on the server. 195 * There are two ways to do this: The old, Sun way, 196 * and the more modern, BOOTP way. (RFC951, RFC1048) 197 * 198 * The default is to use the Sun bootparams RPC 199 * (because that is what the kernel will do). 200 * MD code can make try_bootp initialied data, 201 * which will override this common definition. 202 */ 203 #ifdef SUPPORT_BOOTP 204 int try_bootp; 205 #endif 206 207 static int 208 net_getparams(int sock) 209 { 210 char buf[MAXHOSTNAMELEN]; 211 n_long smask; 212 213 #ifdef SUPPORT_BOOTP 214 /* 215 * Try to get boot info using BOOTP. If we succeed, then 216 * the server IP address, gateway, and root path will all 217 * be initialized. If any remain uninitialized, we will 218 * use RARP and RPC/bootparam (the Sun way) to get them. 219 */ 220 if (try_bootp) 221 bootp(sock); 222 if (myip.s_addr != 0) 223 return 0; 224 #ifdef NETIF_DEBUG 225 if (debug) 226 printf("BOOTP failed, trying RARP/RPC...\n"); 227 #endif 228 #endif 229 230 /* 231 * Use RARP to get our IP address. This also sets our 232 * netmask to the "natural" default for our address. 233 */ 234 if (rarp_getipaddress(sock)) { 235 printf("RARP failed\n"); 236 return EIO; 237 } 238 #ifdef NETIF_DEBUG 239 if (debug) 240 printf("client addr: %s\n", inet_ntoa(myip)); 241 #endif 242 243 /* Get our hostname, server IP address, gateway. */ 244 if (bp_whoami(sock)) { 245 printf("bootparam/whoami RPC failed\n"); 246 return EIO; 247 } 248 #ifdef NETIF_DEBUG 249 if (debug) 250 printf("client name: %s\n", hostname); 251 #endif 252 253 /* 254 * Ignore the gateway from whoami (unreliable). 255 * Use the "gateway" parameter instead. 256 */ 257 smask = 0; 258 gateip.s_addr = 0; 259 if (bp_getfile(sock, "gateway", &gateip, buf)) { 260 printf("nfs_open: gateway bootparam missing\n"); 261 } else { 262 /* Got it! Parse the netmask. */ 263 smask = inet_addr(buf); 264 } 265 if (smask) { 266 netmask = smask; 267 #ifdef NETIF_DEBUG 268 if (debug) 269 printf("subnet mask: %s\n", intoa(netmask)); 270 #endif 271 } 272 #ifdef NETIF_DEBUG 273 if (debug) 274 if (gateip.s_addr) 275 printf("net gateway: %s\n", inet_ntoa(gateip)); 276 #endif 277 278 /* Get the root server and pathname. */ 279 if (bp_getfile(sock, "root", &rootip, rootpath)) { 280 printf("bootparam/getfile RPC failed\n"); 281 return EIO; 282 } 283 284 #ifdef NETIF_DEBUG 285 if (debug) { 286 printf("server addr: %s\n", inet_ntoa(rootip)); 287 printf("server path: %s\n", rootpath); 288 } 289 #endif 290 291 return 0; 292 } 293