dev_net.c revision 329175
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: stable/11/stand/common/dev_net.c 329175 2018-02-12 17:44:35Z kevans $"); 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 72int debug = 0; 73#endif 74 75static char *netdev_name; 76static int netdev_sock = -1; 77static int netdev_opens; 78 79static int net_init(void); 80static int net_open(struct open_file *, ...); 81static int net_close(struct open_file *); 82static void net_cleanup(void); 83static int net_strategy(void *, int, daddr_t, size_t, char *, size_t *); 84static int net_print(int); 85 86static int net_getparams(int sock); 87 88struct 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 100static struct uri_scheme { 101 const char *scheme; 102 int proto; 103} uri_schemes[] = { 104 { "tftp:/", NET_TFTP }, 105 { "nfs:/", NET_NFS }, 106}; 107 108static int 109net_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 */ 120static int 121net_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 f->f_devdata = &netdev_sock; 194 return (error); 195} 196 197static int 198net_close(struct open_file *f) 199{ 200 201#ifdef NETIF_DEBUG 202 if (debug) 203 printf("net_close: opens=%d\n", netdev_opens); 204#endif 205 206 f->f_devdata = NULL; 207 208 return (0); 209} 210 211static void 212net_cleanup(void) 213{ 214 215 if (netdev_sock >= 0) { 216#ifdef NETIF_DEBUG 217 if (debug) 218 printf("net_cleanup: calling netif_close()\n"); 219#endif 220 rootip.s_addr = 0; 221 free(netdev_name); 222 netif_close(netdev_sock); 223 netdev_sock = -1; 224 } 225} 226 227static int 228net_strategy(void *devdata, int rw, daddr_t blk, size_t size, char *buf, 229 size_t *rsize) 230{ 231 232 return (EIO); 233} 234 235#define SUPPORT_BOOTP 236 237/* 238 * Get info for NFS boot: our IP address, our hostname, 239 * server IP address, and our root path on the server. 240 * There are two ways to do this: The old, Sun way, 241 * and the more modern, BOOTP way. (RFC951, RFC1048) 242 * 243 * The default is to use the Sun bootparams RPC 244 * (because that is what the kernel will do). 245 * MD code can make try_bootp initialied data, 246 * which will override this common definition. 247 */ 248#ifdef SUPPORT_BOOTP 249int try_bootp = 1; 250#endif 251 252extern n_long ip_convertaddr(char *p); 253 254static int 255net_getparams(int sock) 256{ 257 char buf[MAXHOSTNAMELEN]; 258 n_long rootaddr, smask; 259 260#ifdef SUPPORT_BOOTP 261 /* 262 * Try to get boot info using BOOTP. If we succeed, then 263 * the server IP address, gateway, and root path will all 264 * be initialized. If any remain uninitialized, we will 265 * use RARP and RPC/bootparam (the Sun way) to get them. 266 */ 267 if (try_bootp) 268 bootp(sock); 269 if (myip.s_addr != 0) 270 goto exit; 271#ifdef NETIF_DEBUG 272 if (debug) 273 printf("net_open: BOOTP failed, trying RARP/RPC...\n"); 274#endif 275#endif 276 277 /* 278 * Use RARP to get our IP address. This also sets our 279 * netmask to the "natural" default for our address. 280 */ 281 if (rarp_getipaddress(sock)) { 282 printf("net_open: RARP failed\n"); 283 return (EIO); 284 } 285 printf("net_open: client addr: %s\n", inet_ntoa(myip)); 286 287 /* Get our hostname, server IP address, gateway. */ 288 if (bp_whoami(sock)) { 289 printf("net_open: bootparam/whoami RPC failed\n"); 290 return (EIO); 291 } 292#ifdef NETIF_DEBUG 293 if (debug) 294 printf("net_open: client name: %s\n", hostname); 295#endif 296 297 /* 298 * Ignore the gateway from whoami (unreliable). 299 * Use the "gateway" parameter instead. 300 */ 301 smask = 0; 302 gateip.s_addr = 0; 303 if (bp_getfile(sock, "gateway", &gateip, buf) == 0) { 304 /* Got it! Parse the netmask. */ 305 smask = ip_convertaddr(buf); 306 } 307 if (smask) { 308 netmask = smask; 309#ifdef NETIF_DEBUG 310 if (debug) 311 printf("net_open: subnet mask: %s\n", intoa(netmask)); 312#endif 313 } 314#ifdef NETIF_DEBUG 315 if (gateip.s_addr && debug) 316 printf("net_open: net gateway: %s\n", inet_ntoa(gateip)); 317#endif 318 319 /* Get the root server and pathname. */ 320 if (bp_getfile(sock, "root", &rootip, rootpath)) { 321 printf("net_open: bootparam/getfile RPC failed\n"); 322 return (EIO); 323 } 324exit: 325 if ((rootaddr = net_parse_rootpath()) != INADDR_NONE) 326 rootip.s_addr = rootaddr; 327 328#ifdef NETIF_DEBUG 329 if (debug) { 330 printf("net_open: server addr: %s\n", inet_ntoa(rootip)); 331 printf("net_open: server path: %s\n", rootpath); 332 } 333#endif 334 335 return (0); 336} 337 338static int 339net_print(int verbose) 340{ 341 struct netif_driver *drv; 342 int i, d, cnt; 343 int ret = 0; 344 345 if (netif_drivers[0] == NULL) 346 return (ret); 347 348 printf("%s devices:", netdev.dv_name); 349 if ((ret = pager_output("\n")) != 0) 350 return (ret); 351 352 cnt = 0; 353 for (d = 0; netif_drivers[d]; d++) { 354 drv = netif_drivers[d]; 355 for (i = 0; i < drv->netif_nifs; i++) { 356 printf("\t%s%d:", netdev.dv_name, cnt++); 357 if (verbose) { 358 printf(" (%s%d)", drv->netif_bname, 359 drv->netif_ifs[i].dif_unit); 360 } 361 if ((ret = pager_output("\n")) != 0) 362 return (ret); 363 } 364 } 365 return (ret); 366} 367 368/* 369 * Parses the rootpath if present 370 * 371 * The rootpath format can be in the form 372 * <scheme>://ip/path 373 * <scheme>:/path 374 * 375 * For compatibility with previous behaviour it also accepts as an NFS scheme 376 * ip:/path 377 * /path 378 * 379 * If an ip is set it returns it in network byte order. 380 * The default scheme defined in the global netproto, if not set it defaults to 381 * NFS. 382 * It leaves just the pathname in the global rootpath. 383 */ 384uint32_t 385net_parse_rootpath(void) 386{ 387 n_long addr = htonl(INADDR_NONE); 388 size_t i; 389 char ip[FNAME_SIZE]; 390 char *ptr, *val; 391 392 netproto = NET_NONE; 393 394 for (i = 0; i < nitems(uri_schemes); i++) { 395 if (strncmp(rootpath, uri_schemes[i].scheme, 396 strlen(uri_schemes[i].scheme)) != 0) 397 continue; 398 399 netproto = uri_schemes[i].proto; 400 break; 401 } 402 ptr = rootpath; 403 /* Fallback for compatibility mode */ 404 if (netproto == NET_NONE) { 405 netproto = NET_NFS; 406 (void)strsep(&ptr, ":"); 407 if (ptr != NULL) { 408 addr = inet_addr(rootpath); 409 bcopy(ptr, rootpath, strlen(ptr) + 1); 410 } 411 } else { 412 ptr += strlen(uri_schemes[i].scheme); 413 if (*ptr == '/') { 414 /* we are in the form <scheme>://, we do expect an ip */ 415 ptr++; 416 /* 417 * XXX when http will be there we will need to check for 418 * a port, but right now we do not need it yet 419 */ 420 val = strchr(ptr, '/'); 421 if (val != NULL) { 422 snprintf(ip, sizeof(ip), "%.*s", 423 (int)((uintptr_t)val - (uintptr_t)ptr), 424 ptr); 425 addr = inet_addr(ip); 426 bcopy(val, rootpath, strlen(val) + 1); 427 } 428 } else { 429 ptr--; 430 bcopy(ptr, rootpath, strlen(ptr) + 1); 431 } 432 } 433 434 return (addr); 435} 436