dev_net.c revision 346042
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 346042 2019-04-08 18:38:18Z 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 struct devdesc *dev; 126 const char *devname; /* Device part of file name (or NULL). */ 127 int error = 0; 128 129 va_start(args, f); 130 dev = va_arg(args, struct devdesc *); 131 va_end(args); 132 133 devname = dev->d_dev->dv_name; 134 /* Before opening another interface, close the previous one first. */ 135 if (netdev_sock >= 0 && strcmp(devname, netdev_name) != 0) 136 net_cleanup(); 137 138 /* On first open, do netif open, mount, etc. */ 139 if (netdev_opens == 0) { 140 /* Find network interface. */ 141 if (netdev_sock < 0) { 142 netdev_sock = netif_open(dev); 143 if (netdev_sock < 0) { 144 printf("net_open: netif_open() failed\n"); 145 return (ENXIO); 146 } 147 netdev_name = strdup(devname); 148#ifdef NETIF_DEBUG 149 if (debug) 150 printf("net_open: netif_open() succeeded\n"); 151#endif 152 } 153 /* 154 * If network params were not set by netif_open(), try to get 155 * them via bootp, rarp, etc. 156 */ 157 if (rootip.s_addr == 0) { 158 /* Get root IP address, and path, etc. */ 159 error = net_getparams(netdev_sock); 160 if (error) { 161 /* getparams makes its own noise */ 162 free(netdev_name); 163 netif_close(netdev_sock); 164 netdev_sock = -1; 165 return (error); 166 } 167 } 168 /* 169 * Set the variables required by the kernel's nfs_diskless 170 * mechanism. This is the minimum set of variables required to 171 * mount a root filesystem without needing to obtain additional 172 * info from bootp or other sources. 173 */ 174 d = socktodesc(netdev_sock); 175 setenv("boot.netif.hwaddr", ether_sprintf(d->myea), 1); 176 setenv("boot.netif.ip", inet_ntoa(myip), 1); 177 setenv("boot.netif.netmask", intoa(netmask), 1); 178 setenv("boot.netif.gateway", inet_ntoa(gateip), 1); 179 setenv("boot.netif.server", inet_ntoa(rootip), 1); 180 if (netproto == NET_TFTP) { 181 setenv("boot.tftproot.server", inet_ntoa(rootip), 1); 182 setenv("boot.tftproot.path", rootpath, 1); 183 } else if (netproto == NET_NFS) { 184 setenv("boot.nfsroot.server", inet_ntoa(rootip), 1); 185 setenv("boot.nfsroot.path", rootpath, 1); 186 } 187 if (intf_mtu != 0) { 188 char mtu[16]; 189 snprintf(mtu, sizeof(mtu), "%u", intf_mtu); 190 setenv("boot.netif.mtu", mtu, 1); 191 } 192 193 } 194 netdev_opens++; 195 f->f_devdata = &netdev_sock; 196 return (error); 197} 198 199static int 200net_close(struct open_file *f) 201{ 202 203#ifdef NETIF_DEBUG 204 if (debug) 205 printf("net_close: opens=%d\n", netdev_opens); 206#endif 207 208 f->f_devdata = NULL; 209 210 return (0); 211} 212 213static void 214net_cleanup(void) 215{ 216 217 if (netdev_sock >= 0) { 218#ifdef NETIF_DEBUG 219 if (debug) 220 printf("net_cleanup: calling netif_close()\n"); 221#endif 222 rootip.s_addr = 0; 223 free(netdev_name); 224 netif_close(netdev_sock); 225 netdev_sock = -1; 226 } 227} 228 229static int 230net_strategy(void *devdata, int rw, daddr_t blk, size_t size, char *buf, 231 size_t *rsize) 232{ 233 234 return (EIO); 235} 236 237#define SUPPORT_BOOTP 238 239/* 240 * Get info for NFS boot: our IP address, our hostname, 241 * server IP address, and our root path on the server. 242 * There are two ways to do this: The old, Sun way, 243 * and the more modern, BOOTP way. (RFC951, RFC1048) 244 * 245 * The default is to use the Sun bootparams RPC 246 * (because that is what the kernel will do). 247 * MD code can make try_bootp initialied data, 248 * which will override this common definition. 249 */ 250#ifdef SUPPORT_BOOTP 251int try_bootp = 1; 252#endif 253 254extern n_long ip_convertaddr(char *p); 255 256static int 257net_getparams(int sock) 258{ 259 char buf[MAXHOSTNAMELEN]; 260 n_long rootaddr, smask; 261 262#ifdef SUPPORT_BOOTP 263 /* 264 * Try to get boot info using BOOTP. If we succeed, then 265 * the server IP address, gateway, and root path will all 266 * be initialized. If any remain uninitialized, we will 267 * use RARP and RPC/bootparam (the Sun way) to get them. 268 */ 269 if (try_bootp) 270 bootp(sock); 271 if (myip.s_addr != 0) 272 goto exit; 273#ifdef NETIF_DEBUG 274 if (debug) 275 printf("net_open: BOOTP failed, trying RARP/RPC...\n"); 276#endif 277#endif 278 279 /* 280 * Use RARP to get our IP address. This also sets our 281 * netmask to the "natural" default for our address. 282 */ 283 if (rarp_getipaddress(sock)) { 284 printf("net_open: RARP failed\n"); 285 return (EIO); 286 } 287 printf("net_open: client addr: %s\n", inet_ntoa(myip)); 288 289 /* Get our hostname, server IP address, gateway. */ 290 if (bp_whoami(sock)) { 291 printf("net_open: bootparam/whoami RPC failed\n"); 292 return (EIO); 293 } 294#ifdef NETIF_DEBUG 295 if (debug) 296 printf("net_open: client name: %s\n", hostname); 297#endif 298 299 /* 300 * Ignore the gateway from whoami (unreliable). 301 * Use the "gateway" parameter instead. 302 */ 303 smask = 0; 304 gateip.s_addr = 0; 305 if (bp_getfile(sock, "gateway", &gateip, buf) == 0) { 306 /* Got it! Parse the netmask. */ 307 smask = ip_convertaddr(buf); 308 } 309 if (smask) { 310 netmask = smask; 311#ifdef NETIF_DEBUG 312 if (debug) 313 printf("net_open: subnet mask: %s\n", intoa(netmask)); 314#endif 315 } 316#ifdef NETIF_DEBUG 317 if (gateip.s_addr && debug) 318 printf("net_open: net gateway: %s\n", inet_ntoa(gateip)); 319#endif 320 321 /* Get the root server and pathname. */ 322 if (bp_getfile(sock, "root", &rootip, rootpath)) { 323 printf("net_open: bootparam/getfile RPC failed\n"); 324 return (EIO); 325 } 326exit: 327 if ((rootaddr = net_parse_rootpath()) != INADDR_NONE) 328 rootip.s_addr = rootaddr; 329 330#ifdef NETIF_DEBUG 331 if (debug) { 332 printf("net_open: server addr: %s\n", inet_ntoa(rootip)); 333 printf("net_open: server path: %s\n", rootpath); 334 } 335#endif 336 337 return (0); 338} 339 340static int 341net_print(int verbose) 342{ 343 struct netif_driver *drv; 344 int i, d, cnt; 345 int ret = 0; 346 347 if (netif_drivers[0] == NULL) 348 return (ret); 349 350 printf("%s devices:", netdev.dv_name); 351 if ((ret = pager_output("\n")) != 0) 352 return (ret); 353 354 cnt = 0; 355 for (d = 0; netif_drivers[d]; d++) { 356 drv = netif_drivers[d]; 357 for (i = 0; i < drv->netif_nifs; i++) { 358 printf("\t%s%d:", netdev.dv_name, cnt++); 359 if (verbose) { 360 printf(" (%s%d)", drv->netif_bname, 361 drv->netif_ifs[i].dif_unit); 362 } 363 if ((ret = pager_output("\n")) != 0) 364 return (ret); 365 } 366 } 367 return (ret); 368} 369 370/* 371 * Parses the rootpath if present 372 * 373 * The rootpath format can be in the form 374 * <scheme>://ip/path 375 * <scheme>:/path 376 * 377 * For compatibility with previous behaviour it also accepts as an NFS scheme 378 * ip:/path 379 * /path 380 * 381 * If an ip is set it returns it in network byte order. 382 * The default scheme defined in the global netproto, if not set it defaults to 383 * NFS. 384 * It leaves just the pathname in the global rootpath. 385 */ 386uint32_t 387net_parse_rootpath(void) 388{ 389 n_long addr = htonl(INADDR_NONE); 390 size_t i; 391 char ip[FNAME_SIZE]; 392 char *ptr, *val; 393 394 netproto = NET_NONE; 395 396 for (i = 0; i < nitems(uri_schemes); i++) { 397 if (strncmp(rootpath, uri_schemes[i].scheme, 398 strlen(uri_schemes[i].scheme)) != 0) 399 continue; 400 401 netproto = uri_schemes[i].proto; 402 break; 403 } 404 ptr = rootpath; 405 /* Fallback for compatibility mode */ 406 if (netproto == NET_NONE) { 407 netproto = NET_NFS; 408 (void)strsep(&ptr, ":"); 409 if (ptr != NULL) { 410 addr = inet_addr(rootpath); 411 bcopy(ptr, rootpath, strlen(ptr) + 1); 412 } 413 } else { 414 ptr += strlen(uri_schemes[i].scheme); 415 if (*ptr == '/') { 416 /* we are in the form <scheme>://, we do expect an ip */ 417 ptr++; 418 /* 419 * XXX when http will be there we will need to check for 420 * a port, but right now we do not need it yet 421 */ 422 val = strchr(ptr, '/'); 423 if (val != NULL) { 424 snprintf(ip, sizeof(ip), "%.*s", 425 (int)((uintptr_t)val - (uintptr_t)ptr), 426 ptr); 427 addr = inet_addr(ip); 428 bcopy(val, rootpath, strlen(val) + 1); 429 } 430 } else { 431 ptr--; 432 bcopy(ptr, rootpath, strlen(ptr) + 1); 433 } 434 } 435 436 return (addr); 437} 438