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 /*- 33 * This module implements a "raw device" interface suitable for 34 * use by the stand-alone I/O library NFS code. This interface 35 * does not support any "block" access, and exists only for the 36 * purpose of initializing the network interface, getting boot 37 * parameters, and performing the NFS mount. 38 * 39 * At open time, this does: 40 * 41 * find interface - netif_open() 42 * RARP for IP address - rarp_getipaddress() 43 * RPC/bootparams - callrpc(d, RPC_BOOTPARAMS, ...) 44 * RPC/mountd - nfs_mount(sock, ip, path) 45 * 46 * the root file handle from mountd is saved in a global 47 * for use by the NFS open code (NFS/lookup). 48 */ 49 50 #include <sys/param.h> 51 #include <sys/socket.h> 52 #include <sys/stdarg.h> 53 54 #include <net/if.h> 55 #include <netinet/in.h> 56 #include <netinet/in_systm.h> 57 58 #include <stand.h> 59 #include <stddef.h> 60 #include <string.h> 61 #include <net.h> 62 #include <netif.h> 63 #include <bootp.h> 64 #include <bootparam.h> 65 66 #include "dev_net.h" 67 #include "bootstrap.h" 68 69 #ifndef NETPROTO_DEFAULT 70 # define NETPROTO_DEFAULT NET_NFS 71 #endif 72 73 static char *netdev_name; 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 void net_cleanup(void); 81 static int net_strategy(void *, int, daddr_t, size_t, char *, size_t *); 82 static int net_print(int); 83 84 static int net_getparams(int sock); 85 86 struct devsw netdev = { 87 .dv_name = "net", 88 .dv_type = DEVT_NET, 89 .dv_init = net_init, 90 .dv_strategy = net_strategy, 91 .dv_open = net_open, 92 .dv_close = net_close, 93 .dv_ioctl = noioctl, 94 .dv_print = net_print, 95 .dv_cleanup = net_cleanup, 96 }; 97 98 static struct uri_scheme { 99 const char *scheme; 100 int proto; 101 } uri_schemes[] = { 102 { "tftp:/", NET_TFTP }, 103 { "nfs:/", NET_NFS }, 104 }; 105 106 static int 107 net_init(void) 108 { 109 110 return (0); 111 } 112 113 /* 114 * Called by devopen after it sets f->f_dev to our devsw entry. 115 * This opens the low-level device and sets dev->d_opendata. 116 * This is declared with variable arguments... 117 */ 118 static int 119 net_open(struct open_file *f, ...) 120 { 121 struct iodesc *d; 122 va_list args; 123 struct devdesc *dev; 124 const char *devname; /* Device part of file name (or NULL). */ 125 int error = 0; 126 127 va_start(args, f); 128 dev = va_arg(args, struct devdesc *); 129 va_end(args); 130 131 devname = dev->d_dev->dv_name; 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(dev); 141 if (netdev_sock < 0) { 142 printf("%s: netif_open() failed\n", __func__); 143 return (ENXIO); 144 } 145 netdev_name = strdup(devname); 146 DEBUG_PRINTF(1,("%s: netif_open() succeeded %#x\n", 147 __func__, rootip.s_addr)); 148 } 149 /* 150 * If network params were not set by netif_open(), try to get 151 * them via bootp, rarp, etc. 152 */ 153 if (rootip.s_addr == 0) { 154 /* Get root IP address, and path, etc. */ 155 error = net_getparams(netdev_sock); 156 if (error) { 157 /* getparams makes its own noise */ 158 free(netdev_name); 159 netif_close(netdev_sock); 160 netdev_sock = -1; 161 return (error); 162 } 163 } 164 /* 165 * Set the variables required by the kernel's nfs_diskless 166 * mechanism. This is the minimum set of variables required to 167 * mount a root filesystem without needing to obtain additional 168 * info from bootp or other sources. 169 */ 170 d = socktodesc(netdev_sock); 171 setenv("boot.netif.hwaddr", ether_sprintf(d->myea), 1); 172 setenv("boot.netif.ip", inet_ntoa(myip), 1); 173 setenv("boot.netif.netmask", intoa(netmask), 1); 174 setenv("boot.netif.gateway", inet_ntoa(gateip), 1); 175 setenv("boot.netif.server", inet_ntoa(rootip), 1); 176 if (netproto == NET_TFTP) { 177 setenv("boot.tftproot.server", inet_ntoa(rootip), 1); 178 setenv("boot.tftproot.path", rootpath, 1); 179 } else if (netproto == NET_NFS) { 180 setenv("boot.nfsroot.server", inet_ntoa(rootip), 1); 181 setenv("boot.nfsroot.path", rootpath, 1); 182 } 183 if (intf_mtu != 0) { 184 char mtu[16]; 185 snprintf(mtu, sizeof(mtu), "%u", intf_mtu); 186 setenv("boot.netif.mtu", mtu, 1); 187 } 188 189 DEBUG_PRINTF(1,("%s: netproto=%d\n", __func__, netproto)); 190 } 191 netdev_opens++; 192 dev->d_opendata = &netdev_sock; 193 return (error); 194 } 195 196 static int 197 net_close(struct open_file *f) 198 { 199 struct devdesc *dev; 200 201 DEBUG_PRINTF(2,("%s: opens=%d\n", __func__, netdev_opens)); 202 203 dev = f->f_devdata; 204 dev->d_opendata = NULL; 205 206 return (0); 207 } 208 209 static void 210 net_cleanup(void) 211 { 212 213 if (netdev_sock >= 0) { 214 DEBUG_PRINTF(1,("%s: calling netif_close()\n", __func__)); 215 rootip.s_addr = 0; 216 free(netdev_name); 217 netif_close(netdev_sock); 218 netdev_sock = -1; 219 } 220 } 221 222 static int 223 net_strategy(void *devdata, int rw, daddr_t blk, size_t size, char *buf, 224 size_t *rsize) 225 { 226 227 return (EIO); 228 } 229 230 #define SUPPORT_BOOTP 231 232 /* 233 * Get info for NFS boot: our IP address, our hostname, 234 * server IP address, and our root path on the server. 235 * There are two ways to do this: The old, Sun way, 236 * and the more modern, BOOTP way. (RFC951, RFC1048) 237 * 238 * The default is to use the Sun bootparams RPC 239 * (because that is what the kernel will do). 240 * MD code can make try_bootp initialied data, 241 * which will override this common definition. 242 */ 243 #ifdef SUPPORT_BOOTP 244 int try_bootp = 1; 245 #endif 246 247 extern n_long ip_convertaddr(char *p); 248 249 static int 250 net_getparams(int sock) 251 { 252 char buf[MAXHOSTNAMELEN]; 253 n_long rootaddr, smask; 254 255 #ifdef SUPPORT_BOOTP 256 /* 257 * Try to get boot info using BOOTP. If we succeed, then 258 * the server IP address, gateway, and root path will all 259 * be initialized. If any remain uninitialized, we will 260 * use RARP and RPC/bootparam (the Sun way) to get them. 261 */ 262 if (try_bootp) 263 bootp(sock); 264 if (myip.s_addr != 0) 265 goto exit; 266 DEBUG_PRINTF(1,("%s: BOOTP failed, trying RARP/RPC...\n", __func__)); 267 #endif 268 269 /* 270 * Use RARP to get our IP address. This also sets our 271 * netmask to the "natural" default for our address. 272 */ 273 if (rarp_getipaddress(sock)) { 274 printf("%s: RARP failed\n", __func__); 275 return (EIO); 276 } 277 printf("%s: client addr: %s\n", __func__, inet_ntoa(myip)); 278 279 /* Get our hostname, server IP address, gateway. */ 280 if (bp_whoami(sock)) { 281 printf("%s: bootparam/whoami RPC failed\n", __func__); 282 return (EIO); 283 } 284 DEBUG_PRINTF(1,("%s: client name: %s\n", __func__, hostname)); 285 286 /* 287 * Ignore the gateway from whoami (unreliable). 288 * Use the "gateway" parameter instead. 289 */ 290 smask = 0; 291 gateip.s_addr = 0; 292 if (bp_getfile(sock, "gateway", &gateip, buf) == 0) { 293 /* Got it! Parse the netmask. */ 294 smask = ip_convertaddr(buf); 295 } 296 if (smask) { 297 netmask = smask; 298 DEBUG_PRINTF(1,("%s: subnet mask: %s\n", __func__, 299 intoa(netmask))); 300 } 301 if (gateip.s_addr) 302 DEBUG_PRINTF(1,("%s: net gateway: %s\n", __func__, 303 inet_ntoa(gateip))); 304 305 /* Get the root server and pathname. */ 306 if (bp_getfile(sock, "root", &rootip, rootpath)) { 307 printf("%s: bootparam/getfile RPC failed\n", __func__); 308 return (EIO); 309 } 310 exit: 311 if ((rootaddr = net_parse_rootpath()) != htonl(INADDR_NONE)) 312 rootip.s_addr = rootaddr; 313 314 DEBUG_PRINTF(1,("%s: proto: %d\n", __func__, netproto)); 315 DEBUG_PRINTF(1,("%s: server addr: %s\n", __func__, inet_ntoa(rootip))); 316 DEBUG_PRINTF(1,("%s: server port: %d\n", __func__, rootport)); 317 DEBUG_PRINTF(1,("%s: server path: %s\n", __func__, rootpath)); 318 319 return (0); 320 } 321 322 static int 323 net_print(int verbose) 324 { 325 struct netif_driver *drv; 326 int i, d, cnt; 327 int ret = 0; 328 329 if (netif_drivers[0] == NULL) 330 return (ret); 331 332 printf("%s devices:", netdev.dv_name); 333 if ((ret = pager_output("\n")) != 0) 334 return (ret); 335 336 cnt = 0; 337 for (d = 0; netif_drivers[d]; d++) { 338 drv = netif_drivers[d]; 339 for (i = 0; i < drv->netif_nifs; i++) { 340 printf("\t%s%d:", netdev.dv_name, cnt++); 341 if (verbose) { 342 printf(" (%s%d)", drv->netif_bname, 343 drv->netif_ifs[i].dif_unit); 344 } 345 if ((ret = pager_output("\n")) != 0) 346 return (ret); 347 } 348 } 349 return (ret); 350 } 351 352 bool 353 is_tftp(void) 354 { 355 return (netproto == NET_TFTP); 356 } 357 358 /* 359 * Parses the rootpath if present 360 * 361 * The rootpath format can be in the form 362 * <scheme>://ip[:port]/path 363 * <scheme>:/path 364 * 365 * For compatibility with previous behaviour it also accepts as an NFS scheme 366 * ip:/path 367 * /path 368 * 369 * If an ip is set it returns it in network byte order. 370 * The default scheme defined in the global netproto, if not set it defaults to 371 * NFS. 372 * It leaves just the pathname in the global rootpath. 373 */ 374 uint32_t 375 net_parse_rootpath(void) 376 { 377 n_long addr = 0; 378 size_t i; 379 char ip[FNAME_SIZE]; 380 char *ptr, *portp, *val; 381 382 netproto = NET_NONE; 383 384 for (i = 0; i < nitems(uri_schemes); i++) { 385 if (strncmp(rootpath, uri_schemes[i].scheme, 386 strlen(uri_schemes[i].scheme)) != 0) 387 continue; 388 389 netproto = uri_schemes[i].proto; 390 break; 391 } 392 ptr = rootpath; 393 /* Fallback for compatibility mode */ 394 if (netproto == NET_NONE) { 395 netproto = NETPROTO_DEFAULT; 396 (void)strsep(&ptr, ":"); 397 if (ptr != NULL) { 398 addr = inet_addr(rootpath); 399 DEBUG_PRINTF(1,("rootpath=%s addr=%#x\n", 400 rootpath, addr)); 401 bcopy(ptr, rootpath, strlen(ptr) + 1); 402 } 403 } else { 404 ptr += strlen(uri_schemes[i].scheme); 405 if (*ptr == '/') { 406 /* we are in the form <scheme>://, we do expect an ip */ 407 ptr++; 408 portp = val = strchr(ptr, ':'); 409 if (val != NULL) { 410 val++; 411 rootport = strtol(val, NULL, 10); 412 } 413 val = strchr(ptr, '/'); 414 if (val != NULL) { 415 if (portp == NULL) 416 portp = val; 417 snprintf(ip, sizeof(ip), "%.*s", 418 (int)(portp - ptr), 419 ptr); 420 addr = inet_addr(ip); 421 DEBUG_PRINTF(1,("ip=%s addr=%#x\n", 422 ip, addr)); 423 bcopy(val, rootpath, strlen(val) + 1); 424 } 425 } else { 426 ptr--; 427 bcopy(ptr, rootpath, strlen(ptr) + 1); 428 } 429 } 430 if (addr == 0) 431 addr = htonl(INADDR_NONE); 432 return (addr); 433 } 434