1 /* 2 * $NetBSD: dev_net.c,v 1.7 2009/10/26 19:16:56 cegger Exp $ 3 */ 4 5 /*- 6 * Copyright (c) 1997 The NetBSD Foundation, Inc. 7 * All rights reserved. 8 * 9 * This code is derived from software contributed to The NetBSD Foundation 10 * by Gordon W. Ross. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 22 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 23 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 24 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 25 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 26 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 27 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 28 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 29 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 30 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 31 * POSSIBILITY OF SUCH DAMAGE. 32 */ 33 34 #include <sys/cdefs.h> 35 /* __FBSDID("$FreeBSD: src/sys/boot/common/dev_net.c,v 1.15 2004/07/08 22:35:33 brian Exp $"); */ 36 37 /*- 38 * This module implements a "raw device" interface suitable for 39 * use by the stand-alone I/O library NFS code. This interface 40 * does not support any "block" access, and exists only for the 41 * purpose of initializing the network interface, getting boot 42 * parameters, and performing the NFS mount. 43 * 44 * At open time, this does: 45 * 46 * find interface - netif_open() 47 * RARP for IP address - rarp_getipaddress() 48 * RPC/bootparams - callrpc(d, RPC_BOOTPARAMS, ...) 49 * RPC/mountd - nfs_mount(sock, ip, path) 50 * 51 * the root file handle from mountd is saved in a global 52 * for use by the NFS open code (NFS/lookup). 53 */ 54 55 #include <machine/stdarg.h> 56 #include <sys/param.h> 57 #include <sys/socket.h> 58 #include <net/if.h> 59 #include <netinet/in.h> 60 #include <netinet/in_systm.h> 61 62 #include <stand.h> 63 #include <string.h> 64 #include <net.h> 65 #include <netif.h> 66 #include <bootp.h> 67 #include <bootparam.h> 68 69 #include "dev_net.h" 70 #include "bootstrap.h" 71 72 int debug = 0; 73 74 static int netdev_sock = -1; 75 static int netdev_opens; 76 77 static int net_init(void); 78 static int net_open(struct open_file *, ...); 79 static int net_close(struct open_file *); 80 static int net_strategy(); 81 static void net_print(int); 82 83 static int net_getparams(int sock); 84 85 struct devsw netdev = { 86 "net", 87 DEVT_NET, 88 net_init, 89 net_strategy, 90 net_open, 91 net_close, 92 noioctl, 93 net_print 94 }; 95 96 int 97 net_init(void) 98 { 99 return 0; 100 } 101 102 /* 103 * Called by devopen after it sets f->f_dev to our devsw entry. 104 * This opens the low-level device and sets f->f_devdata. 105 * This is declared with variable arguments... 106 */ 107 int 108 net_open(struct open_file *f, ...) 109 { 110 va_list args; 111 char *devname; /* Device part of file name (or NULL). */ 112 int error = 0; 113 114 va_start(args, f); 115 devname = va_arg(args, char*); 116 va_end(args); 117 118 /* On first open, do netif open, mount, etc. */ 119 if (netdev_opens == 0) { 120 /* Find network interface. */ 121 if (netdev_sock < 0) { 122 netdev_sock = netif_open(devname); 123 if (netdev_sock < 0) { 124 printf("net_open: netif_open() failed\n"); 125 return (ENXIO); 126 } 127 if (debug) 128 printf("net_open: netif_open() succeeded\n"); 129 } 130 if (rootip.s_addr == 0) { 131 /* Get root IP address, and path, etc. */ 132 error = net_getparams(netdev_sock); 133 if (error) { 134 /* getparams makes its own noise */ 135 netif_close(netdev_sock); 136 netdev_sock = -1; 137 return (error); 138 } 139 } 140 netdev_opens++; 141 } 142 netdev_opens++; 143 f->f_devdata = &netdev_sock; 144 return (error); 145 } 146 147 int 148 net_close(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 if (debug) 168 printf("net_close: calling netif_close()\n"); 169 netif_close(netdev_sock); 170 netdev_sock = -1; 171 } 172 return (0); 173 } 174 175 int 176 net_strategy(void) 177 { 178 return EIO; 179 } 180 181 #define SUPPORT_BOOTP 182 183 /* 184 * Get info for NFS boot: our IP address, our hostname, 185 * server IP address, and our root path on the server. 186 * There are two ways to do this: The old, Sun way, 187 * and the more modern, BOOTP way. (RFC951, RFC1048) 188 * 189 * The default is to use the Sun bootparams RPC 190 * (because that is what the kernel will do). 191 * MD code can make try_bootp initialied data, 192 * which will override this common definition. 193 */ 194 #ifdef SUPPORT_BOOTP 195 int try_bootp = 1; 196 #endif 197 198 extern n_long ip_convertaddr(char *p); 199 200 static int 201 net_getparams(int sock) 202 { 203 char buf[MAXHOSTNAMELEN]; 204 char temp[FNAME_SIZE]; 205 struct iodesc *d; 206 int i; 207 n_long smask; 208 209 #ifdef SUPPORT_BOOTP 210 /* 211 * Try to get boot info using BOOTP. If we succeed, then 212 * the server IP address, gateway, and root path will all 213 * be initialized. If any remain uninitialized, we will 214 * use RARP and RPC/bootparam (the Sun way) to get them. 215 */ 216 if (try_bootp) 217 bootp(sock, BOOTP_NONE); 218 if (myip.s_addr != 0) 219 goto exit; 220 if (debug) 221 printf("net_open: BOOTP failed, trying RARP/RPC...\n"); 222 #endif 223 224 /* 225 * Use RARP to get our IP address. This also sets our 226 * netmask to the "natural" default for our address. 227 */ 228 if (rarp_getipaddress(sock)) { 229 printf("net_open: RARP failed\n"); 230 return (EIO); 231 } 232 printf("net_open: client addr: %s\n", inet_ntoa(myip)); 233 234 /* Get our hostname, server IP address, gateway. */ 235 if (bp_whoami(sock)) { 236 printf("net_open: bootparam/whoami RPC failed\n"); 237 return (EIO); 238 } 239 printf("net_open: client name: %s\n", hostname); 240 241 /* 242 * Ignore the gateway from whoami (unreliable). 243 * Use the "gateway" parameter instead. 244 */ 245 smask = 0; 246 gateip.s_addr = 0; 247 if (bp_getfile(sock, "gateway", &gateip, buf) == 0) { 248 /* Got it! Parse the netmask. */ 249 smask = ip_convertaddr(buf); 250 } 251 if (smask) { 252 netmask = smask; 253 printf("net_open: subnet mask: %s\n", intoa(netmask)); 254 } 255 if (gateip.s_addr) 256 printf("net_open: net gateway: %s\n", inet_ntoa(gateip)); 257 258 /* Get the root server and pathname. */ 259 if (bp_getfile(sock, "root", &rootip, rootpath)) { 260 printf("net_open: bootparam/getfile RPC failed\n"); 261 return (EIO); 262 } 263 exit: 264 /* 265 * If present, strip the server's address off of the rootpath 266 * before passing it along. This allows us to be compatible with 267 * the kernel's diskless (BOOTP_NFSROOT) booting conventions 268 */ 269 for (i = 0; rootpath[i] != '\0' && i < FNAME_SIZE; i++) 270 if (rootpath[i] == ':') 271 break; 272 if (i && i != FNAME_SIZE && rootpath[i] == ':') { 273 rootpath[i++] = '\0'; 274 if (inet_addr(&rootpath[0]) != INADDR_NONE) 275 rootip.s_addr = inet_addr(&rootpath[0]); 276 memcpy(&temp[0], &rootpath[i], strlen(&rootpath[i])+1); 277 memcpy(&rootpath[0], &temp[0], strlen(&rootpath[i])+1); 278 } 279 printf("net_open: server addr: %s\n", inet_ntoa(rootip)); 280 printf("net_open: server path: %s\n", rootpath); 281 282 d = socktodesc(sock); 283 sprintf(temp, "%6D", d->myea, ":"); 284 setenv("boot.netif.ip", inet_ntoa(myip), 1); 285 setenv("boot.netif.netmask", intoa(netmask), 1); 286 setenv("boot.netif.gateway", inet_ntoa(gateip), 1); 287 setenv("boot.netif.hwaddr", temp, 1); 288 setenv("boot.nfsroot.server", inet_ntoa(rootip), 1); 289 setenv("boot.nfsroot.path", rootpath, 1); 290 291 return (0); 292 } 293 294 static void 295 net_print(int verbose) 296 { 297 return; 298 } 299