dev_net.c revision 1.2
1 /* $NetBSD: dev_net.c,v 1.2 2003/03/11 15:01:51 drochner 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 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 netif_close(netdev_sock); 117 netdev_sock = -1; 118 return (error); 119 } 120 } 121 } 122 netdev_opens++; 123 f->f_devdata = &netdev_sock; 124 return (error); 125 } 126 127 int 128 net_close(f) 129 struct open_file *f; 130 { 131 132 #ifdef NETIF_DEBUG 133 if (debug) 134 printf("net_close: opens=%d\n", netdev_opens); 135 #endif 136 137 /* On last close, do netif close, etc. */ 138 f->f_devdata = NULL; 139 /* Extra close call? */ 140 if (netdev_opens <= 0) 141 return (0); 142 netdev_opens--; 143 /* Not last close? */ 144 if (netdev_opens > 0) 145 return(0); 146 rootip.s_addr = 0; 147 if (netdev_sock >= 0) { 148 if (debug) 149 printf("net_close: calling netif_close()\n"); 150 netif_close(netdev_sock); 151 netdev_sock = -1; 152 } 153 return (0); 154 } 155 156 int 157 net_ioctl(f, cmd, data) 158 struct open_file *f; 159 u_long cmd; 160 void *data; 161 { 162 return EIO; 163 } 164 165 int 166 net_strategy(devdata, rw, blk, size, buf, rsize) 167 void *devdata; 168 int rw; 169 daddr_t blk; 170 size_t size; 171 void *buf; 172 size_t *rsize; 173 { 174 return EIO; 175 } 176 177 178 /* 179 * Get info for NFS boot: our IP address, our hostname, 180 * server IP address, and our root path on the server. 181 * There are two ways to do this: The old, Sun way, 182 * and the more modern, BOOTP way. (RFC951, RFC1048) 183 * 184 * The default is to use the Sun bootparams RPC 185 * (because that is what the kernel will do). 186 * MD code can make try_bootp initialied data, 187 * which will override this common definition. 188 */ 189 #ifdef SUPPORT_BOOTP 190 int try_bootp; 191 int bootp __P((int sock)); 192 #endif 193 194 static int 195 net_getparams(sock) 196 int sock; 197 { 198 char buf[MAXHOSTNAMELEN]; 199 n_long smask; 200 #ifdef SUPPORT_BOOTP 201 /* 202 * Try to get boot info using BOOTP. If we succeed, then 203 * the server IP address, gateway, and root path will all 204 * be initialized. If any remain uninitialized, we will 205 * use RARP and RPC/bootparam (the Sun way) to get them. 206 */ 207 if (try_bootp) 208 bootp(sock); 209 if (myip.s_addr != 0) 210 return (0); 211 if (debug) 212 printf("net_open: BOOTP failed, trying RARP/RPC...\n"); 213 #endif 214 215 /* 216 * Use RARP to get our IP address. This also sets our 217 * netmask to the "natural" default for our address. 218 */ 219 if (rarp_getipaddress(sock)) { 220 printf("net_open: RARP failed\n"); 221 return (EIO); 222 } 223 printf("net_open: client addr: %s\n", inet_ntoa(myip)); 224 225 /* Get our hostname, server IP address, gateway. */ 226 if (bp_whoami(sock)) { 227 printf("net_open: bootparam/whoami RPC failed\n"); 228 return (EIO); 229 } 230 printf("net_open: client name: %s\n", hostname); 231 232 /* 233 * Ignore the gateway from whoami (unreliable). 234 * Use the "gateway" parameter instead. 235 */ 236 smask = 0; 237 gateip.s_addr = 0; 238 if (bp_getfile(sock, "gateway", &gateip, buf)) 239 printf("nfs_open: gateway bootparam missing\n"); 240 else { 241 /* Got it! Parse the netmask. */ 242 smask = inet_addr(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
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