1 /* $NetBSD: dev_net.c,v 1.23 2008/04/28 20:24:06 martin 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 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 #include <sys/cdefs.h> 33 __FBSDID("$FreeBSD$"); 34 35 /*- 36 * This module implements a "raw device" interface suitable for 37 * use by the stand-alone I/O library NFS code. This interface 38 * does not support any "block" access, and exists only for the 39 * purpose of initializing the network interface, getting boot 40 * parameters, and performing the NFS mount. 41 * 42 * At open time, this does: 43 * 44 * find interface - netif_open() 45 * RARP for IP address - rarp_getipaddress() 46 * RPC/bootparams - callrpc(d, RPC_BOOTPARAMS, ...) 47 * RPC/mountd - nfs_mount(sock, ip, path) 48 * 49 * the root file handle from mountd is saved in a global 50 * for use by the NFS open code (NFS/lookup). 51 */ 52 53 #include <machine/stdarg.h> 54 #include <sys/param.h> 55 #include <sys/socket.h> 56 #include <net/if.h> 57 #include <netinet/in.h> 58 #include <netinet/in_systm.h> 59 60 #include <stand.h> 61 #include <stddef.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 71 #ifdef NETIF_DEBUG 72 int debug = 0; 73 #endif 74 75 static char *netdev_name; 76 static int netdev_sock = -1; 77 static int netdev_opens; 78 79 static int net_init(void); 80 static int net_open(struct open_file *, ...); 81 static int net_close(struct open_file *); 82 static void net_cleanup(void); 83 static int net_strategy(void *, int, daddr_t, size_t, char *, size_t *); 84 static int net_print(int); 85 86 static int net_getparams(int sock); 87 88 struct devsw netdev = { 89 "net", 90 DEVT_NET, 91 net_init, 92 net_strategy, 93 net_open, 94 net_close, 95 noioctl, 96 net_print, 97 net_cleanup 98 }; 99 100 static struct uri_scheme { 101 const char *scheme; 102 int proto; 103 } uri_schemes[] = { 104 { "tftp:/", NET_TFTP }, 105 { "nfs:/", NET_NFS }, 106 }; 107 108 static int 109 net_init(void) 110 { 111 112 return (0); 113 } 114 115 /* 116 * Called by devopen after it sets f->f_dev to our devsw entry. 117 * This opens the low-level device and sets f->f_devdata. 118 * This is declared with variable arguments... 119 */ 120 static int 121 net_open(struct open_file *f, ...) 122 { 123 struct iodesc *d; 124 va_list args; 125 char *devname; /* Device part of file name (or NULL). */ 126 int error = 0; 127 128 va_start(args, f); 129 devname = va_arg(args, char*); 130 va_end(args); 131 132 /* Before opening another interface, close the previous one first. */ 133 if (netdev_sock >= 0 && strcmp(devname, netdev_name) != 0) 134 net_cleanup(); 135 136 /* On first open, do netif open, mount, etc. */ 137 if (netdev_opens == 0) { 138 /* Find network interface. */ 139 if (netdev_sock < 0) { 140 netdev_sock = netif_open(devname); 141 if (netdev_sock < 0) { 142 printf("net_open: netif_open() failed\n"); 143 return (ENXIO); 144 } 145 netdev_name = strdup(devname); 146 #ifdef NETIF_DEBUG 147 if (debug) 148 printf("net_open: netif_open() succeeded\n"); 149 #endif 150 } 151 /* 152 * If network params were not set by netif_open(), try to get 153 * them via bootp, rarp, etc. 154 */ 155 if (rootip.s_addr == 0) { 156 /* Get root IP address, and path, etc. */ 157 error = net_getparams(netdev_sock); 158 if (error) { 159 /* getparams makes its own noise */ 160 free(netdev_name); 161 netif_close(netdev_sock); 162 netdev_sock = -1; 163 return (error); 164 } 165 } 166 /* 167 * Set the variables required by the kernel's nfs_diskless 168 * mechanism. This is the minimum set of variables required to 169 * mount a root filesystem without needing to obtain additional 170 * info from bootp or other sources. 171 */ 172 d = socktodesc(netdev_sock); 173 setenv("boot.netif.hwaddr", ether_sprintf(d->myea), 1); 174 setenv("boot.netif.ip", inet_ntoa(myip), 1); 175 setenv("boot.netif.netmask", intoa(netmask), 1); 176 setenv("boot.netif.gateway", inet_ntoa(gateip), 1); 177 setenv("boot.netif.server", inet_ntoa(rootip), 1); 178 if (netproto == NET_TFTP) { 179 setenv("boot.tftproot.server", inet_ntoa(rootip), 1); 180 setenv("boot.tftproot.path", rootpath, 1); 181 } else if (netproto == NET_NFS) { 182 setenv("boot.nfsroot.server", inet_ntoa(rootip), 1); 183 setenv("boot.nfsroot.path", rootpath, 1); 184 } 185 if (intf_mtu != 0) { 186 char mtu[16]; 187 snprintf(mtu, sizeof(mtu), "%u", intf_mtu); 188 setenv("boot.netif.mtu", mtu, 1); 189 } 190 191 } 192 netdev_opens++; 193 return (error); 194 } 195 196 static int 197 net_close(struct open_file *f) 198 { 199 200 #ifdef NETIF_DEBUG 201 if (debug) 202 printf("net_close: opens=%d\n", netdev_opens); 203 #endif 204 return (0); 205 } 206 207 static void 208 net_cleanup(void) 209 { 210 211 if (netdev_sock >= 0) { 212 #ifdef NETIF_DEBUG 213 if (debug) 214 printf("net_cleanup: calling netif_close()\n"); 215 #endif 216 rootip.s_addr = 0; 217 free(netdev_name); 218 netif_close(netdev_sock); 219 netdev_sock = -1; 220 } 221 } 222 223 static int 224 net_strategy(void *devdata, int rw, daddr_t blk, size_t size, char *buf, 225 size_t *rsize) 226 { 227 228 return (EIO); 229 } 230 231 #define SUPPORT_BOOTP 232 233 /* 234 * Get info for NFS boot: our IP address, our hostname, 235 * server IP address, and our root path on the server. 236 * There are two ways to do this: The old, Sun way, 237 * and the more modern, BOOTP way. (RFC951, RFC1048) 238 * 239 * The default is to use the Sun bootparams RPC 240 * (because that is what the kernel will do). 241 * MD code can make try_bootp initialied data, 242 * which will override this common definition. 243 */ 244 #ifdef SUPPORT_BOOTP 245 int try_bootp = 1; 246 #endif 247 248 extern n_long ip_convertaddr(char *p); 249 250 static int 251 net_getparams(int sock) 252 { 253 char buf[MAXHOSTNAMELEN]; 254 n_long rootaddr, smask; 255 256 #ifdef SUPPORT_BOOTP 257 /* 258 * Try to get boot info using BOOTP. If we succeed, then 259 * the server IP address, gateway, and root path will all 260 * be initialized. If any remain uninitialized, we will 261 * use RARP and RPC/bootparam (the Sun way) to get them. 262 */ 263 if (try_bootp) 264 bootp(sock); 265 if (myip.s_addr != 0) 266 goto exit; 267 #ifdef NETIF_DEBUG 268 if (debug) 269 printf("net_open: BOOTP failed, trying RARP/RPC...\n"); 270 #endif 271 #endif 272 273 /* 274 * Use RARP to get our IP address. This also sets our 275 * netmask to the "natural" default for our address. 276 */ 277 if (rarp_getipaddress(sock)) { 278 printf("net_open: RARP failed\n"); 279 return (EIO); 280 } 281 printf("net_open: client addr: %s\n", inet_ntoa(myip)); 282 283 /* Get our hostname, server IP address, gateway. */ 284 if (bp_whoami(sock)) { 285 printf("net_open: bootparam/whoami RPC failed\n"); 286 return (EIO); 287 } 288 #ifdef NETIF_DEBUG 289 if (debug) 290 printf("net_open: client name: %s\n", hostname); 291 #endif 292 293 /* 294 * Ignore the gateway from whoami (unreliable). 295 * Use the "gateway" parameter instead. 296 */ 297 smask = 0; 298 gateip.s_addr = 0; 299 if (bp_getfile(sock, "gateway", &gateip, buf) == 0) { 300 /* Got it! Parse the netmask. */ 301 smask = ip_convertaddr(buf); 302 } 303 if (smask) { 304 netmask = smask; 305 #ifdef NETIF_DEBUG 306 if (debug) 307 printf("net_open: subnet mask: %s\n", intoa(netmask)); 308 #endif 309 } 310 #ifdef NETIF_DEBUG 311 if (gateip.s_addr && debug) 312 printf("net_open: net gateway: %s\n", inet_ntoa(gateip)); 313 #endif 314 315 /* Get the root server and pathname. */ 316 if (bp_getfile(sock, "root", &rootip, rootpath)) { 317 printf("net_open: bootparam/getfile RPC failed\n"); 318 return (EIO); 319 } 320 exit: 321 if ((rootaddr = net_parse_rootpath()) != INADDR_NONE) 322 rootip.s_addr = rootaddr; 323 324 #ifdef NETIF_DEBUG 325 if (debug) { 326 printf("net_open: server addr: %s\n", inet_ntoa(rootip)); 327 printf("net_open: server path: %s\n", rootpath); 328 } 329 #endif 330 331 return (0); 332 } 333 334 static int 335 net_print(int verbose) 336 { 337 struct netif_driver *drv; 338 int i, d, cnt; 339 int ret = 0; 340 341 if (netif_drivers[0] == NULL) 342 return (ret); 343 344 printf("%s devices:", netdev.dv_name); 345 if ((ret = pager_output("\n")) != 0) 346 return (ret); 347 348 cnt = 0; 349 for (d = 0; netif_drivers[d]; d++) { 350 drv = netif_drivers[d]; 351 for (i = 0; i < drv->netif_nifs; i++) { 352 printf("\t%s%d:", netdev.dv_name, cnt++); 353 if (verbose) { 354 printf(" (%s%d)", drv->netif_bname, 355 drv->netif_ifs[i].dif_unit); 356 } 357 if ((ret = pager_output("\n")) != 0) 358 return (ret); 359 } 360 } 361 return (ret); 362 } 363 364 /* 365 * Parses the rootpath if present 366 * 367 * The rootpath format can be in the form 368 * <scheme>://ip/path 369 * <scheme>:/path 370 * 371 * For compatibility with previous behaviour it also accepts as an NFS scheme 372 * ip:/path 373 * /path 374 * 375 * If an ip is set it returns it in network byte order. 376 * The default scheme defined in the global netproto, if not set it defaults to 377 * NFS. 378 * It leaves just the pathname in the global rootpath. 379 */ 380 uint32_t 381 net_parse_rootpath(void) 382 { 383 n_long addr = htonl(INADDR_NONE); 384 size_t i; 385 char ip[FNAME_SIZE]; 386 char *ptr, *val; 387 388 netproto = NET_NONE; 389 390 for (i = 0; i < nitems(uri_schemes); i++) { 391 if (strncmp(rootpath, uri_schemes[i].scheme, 392 strlen(uri_schemes[i].scheme)) != 0) 393 continue; 394 395 netproto = uri_schemes[i].proto; 396 break; 397 } 398 ptr = rootpath; 399 /* Fallback for compatibility mode */ 400 if (netproto == NET_NONE) { 401 netproto = NET_NFS; 402 (void)strsep(&ptr, ":"); 403 if (ptr != NULL) { 404 addr = inet_addr(rootpath); 405 bcopy(ptr, rootpath, strlen(ptr) + 1); 406 } 407 } else { 408 ptr += strlen(uri_schemes[i].scheme); 409 if (*ptr == '/') { 410 /* we are in the form <scheme>://, we do expect an ip */ 411 ptr++; 412 /* 413 * XXX when http will be there we will need to check for 414 * a port, but right now we do not need it yet 415 */ 416 val = strchr(ptr, '/'); 417 if (val != NULL) { 418 snprintf(ip, sizeof(ip), "%.*s", 419 (int)((uintptr_t)val - (uintptr_t)ptr), 420 ptr); 421 addr = inet_addr(ip); 422 bcopy(val, rootpath, strlen(val) + 1); 423 } 424 } else { 425 ptr--; 426 bcopy(ptr, rootpath, strlen(ptr) + 1); 427 } 428 } 429 430 return (addr); 431 } 432