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 <sys/param.h> 56#include <sys/socket.h> 57#include <net/if.h> 58#include <netinet/in.h> 59#include <netinet/in_systm.h> 60 61#include <stand.h> 62#include <string.h> 63#include <net.h> 64#include <netif.h> 65#include <bootp.h> 66#include <bootparam.h> 67 68#include "dev_net.h" 69#include "bootstrap.h" 70 71int debug = 0; 72 73static int netdev_sock = -1; 74static int netdev_opens; 75 76static int net_init(void); 77static int net_open(struct open_file *, ...); 78static int net_close(struct open_file *); 79static int net_strategy(); 80static void net_print(int); 81 82static int net_getparams(int sock); 83 84struct devsw netdev = { 85 "net", 86 DEVT_NET, 87 net_init, 88 net_strategy, 89 net_open, 90 net_close, 91 noioctl, 92 net_print 93}; 94 95int 96net_init(void) 97{ 98 return 0; 99} 100 101/* 102 * Called by devopen after it sets f->f_dev to our devsw entry. 103 * This opens the low-level device and sets f->f_devdata. 104 * This is declared with variable arguments... 105 */ 106int 107net_open(struct open_file *f, ...) 108{ 109 va_list args; 110 char *devname; /* Device part of file name (or NULL). */ 111 int error = 0; 112 113 va_start(args, f); 114 devname = va_arg(args, char*); 115 va_end(args); 116 117 /* On first open, do netif open, mount, etc. */ 118 if (netdev_opens == 0) { 119 /* Find network interface. */ 120 if (netdev_sock < 0) { 121 netdev_sock = netif_open(devname); 122 if (netdev_sock < 0) { 123 printf("net_open: netif_open() failed\n"); 124 return (ENXIO); 125 } 126 if (debug) 127 printf("net_open: netif_open() succeeded\n"); 128 } 129 if (rootip.s_addr == 0) { 130 /* Get root IP address, and path, etc. */ 131 error = net_getparams(netdev_sock); 132 if (error) { 133 /* getparams makes its own noise */ 134 netif_close(netdev_sock); 135 netdev_sock = -1; 136 return (error); 137 } 138 } 139 netdev_opens++; 140 } 141 netdev_opens++; 142 f->f_devdata = &netdev_sock; 143 return (error); 144} 145 146int 147net_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 if (debug) 167 printf("net_close: calling netif_close()\n"); 168 netif_close(netdev_sock); 169 netdev_sock = -1; 170 } 171 return (0); 172} 173 174int 175net_strategy(void) 176{ 177 return EIO; 178} 179 180#define SUPPORT_BOOTP 181 182/* 183 * Get info for NFS boot: our IP address, our hostname, 184 * server IP address, and our root path on the server. 185 * There are two ways to do this: The old, Sun way, 186 * and the more modern, BOOTP way. (RFC951, RFC1048) 187 * 188 * The default is to use the Sun bootparams RPC 189 * (because that is what the kernel will do). 190 * MD code can make try_bootp initialied data, 191 * which will override this common definition. 192 */ 193#ifdef SUPPORT_BOOTP 194int try_bootp = 1; 195#endif 196 197extern n_long ip_convertaddr(char *p); 198 199static int 200net_getparams(int sock) 201{ 202 char buf[MAXHOSTNAMELEN]; 203 char temp[FNAME_SIZE]; 204 struct iodesc *d; 205 int i; 206 n_long smask; 207 208#ifdef SUPPORT_BOOTP 209 /* 210 * Try to get boot info using BOOTP. If we succeed, then 211 * the server IP address, gateway, and root path will all 212 * be initialized. If any remain uninitialized, we will 213 * use RARP and RPC/bootparam (the Sun way) to get them. 214 */ 215 if (try_bootp) 216 bootp(sock, BOOTP_NONE); 217 if (myip.s_addr != 0) 218 goto exit; 219 if (debug) 220 printf("net_open: BOOTP failed, trying RARP/RPC...\n"); 221#endif 222 223 /* 224 * Use RARP to get our IP address. This also sets our 225 * netmask to the "natural" default for our address. 226 */ 227 if (rarp_getipaddress(sock)) { 228 printf("net_open: RARP failed\n"); 229 return (EIO); 230 } 231 printf("net_open: client addr: %s\n", inet_ntoa(myip)); 232 233 /* Get our hostname, server IP address, gateway. */ 234 if (bp_whoami(sock)) { 235 printf("net_open: bootparam/whoami RPC failed\n"); 236 return (EIO); 237 } 238 printf("net_open: client name: %s\n", hostname); 239 240 /* 241 * Ignore the gateway from whoami (unreliable). 242 * Use the "gateway" parameter instead. 243 */ 244 smask = 0; 245 gateip.s_addr = 0; 246 if (bp_getfile(sock, "gateway", &gateip, buf) == 0) { 247 /* Got it! Parse the netmask. */ 248 smask = ip_convertaddr(buf); 249 } 250 if (smask) { 251 netmask = smask; 252 printf("net_open: subnet mask: %s\n", intoa(netmask)); 253 } 254 if (gateip.s_addr) 255 printf("net_open: net gateway: %s\n", inet_ntoa(gateip)); 256 257 /* Get the root server and pathname. */ 258 if (bp_getfile(sock, "root", &rootip, rootpath)) { 259 printf("net_open: bootparam/getfile RPC failed\n"); 260 return (EIO); 261 } 262 exit: 263 /* 264 * If present, strip the server's address off of the rootpath 265 * before passing it along. This allows us to be compatible with 266 * the kernel's diskless (BOOTP_NFSROOT) booting conventions 267 */ 268 for (i = 0; rootpath[i] != '\0' && i < FNAME_SIZE; i++) 269 if (rootpath[i] == ':') 270 break; 271 if (i && i != FNAME_SIZE && rootpath[i] == ':') { 272 rootpath[i++] = '\0'; 273 if (inet_addr(&rootpath[0]) != INADDR_NONE) 274 rootip.s_addr = inet_addr(&rootpath[0]); 275 memcpy(&temp[0], &rootpath[i], strlen(&rootpath[i])+1); 276 memcpy(&rootpath[0], &temp[0], strlen(&rootpath[i])+1); 277 } 278 printf("net_open: server addr: %s\n", inet_ntoa(rootip)); 279 printf("net_open: server path: %s\n", rootpath); 280 281 d = socktodesc(sock); 282 sprintf(temp, "%6D", d->myea, ":"); 283 setenv("boot.netif.ip", inet_ntoa(myip), 1); 284 setenv("boot.netif.netmask", intoa(netmask), 1); 285 setenv("boot.netif.gateway", inet_ntoa(gateip), 1); 286 setenv("boot.netif.hwaddr", temp, 1); 287 setenv("boot.nfsroot.server", inet_ntoa(rootip), 1); 288 setenv("boot.nfsroot.path", rootpath, 1); 289 290 return (0); 291} 292 293static void 294net_print(int verbose) 295{ 296 return; 297} 298