1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1990 The Regents of the University of California. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * William Jolitz. 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. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 * 34 * from: @(#)autoconf.c 7.1 (Berkeley) 5/9/91 35 */ 36 37 #include <sys/cdefs.h> 38 __FBSDID("$FreeBSD$"); 39 40 #include "opt_bootp.h" 41 42 #include <sys/param.h> 43 #include <sys/systm.h> 44 #include <sys/jail.h> 45 #include <sys/kernel.h> 46 #include <sys/malloc.h> 47 #include <sys/mount.h> 48 #include <sys/socket.h> 49 50 #include <net/if.h> 51 #include <net/if_dl.h> 52 #include <net/if_types.h> 53 #include <net/if_var.h> 54 #include <net/ethernet.h> 55 #include <net/vnet.h> 56 57 #include <netinet/in.h> 58 #include <nfs/nfsproto.h> 59 #include <nfsclient/nfs.h> 60 #include <nfs/nfsdiskless.h> 61 62 #define NFS_IFACE_TIMEOUT_SECS 10 /* Timeout for interface to appear. */ 63 64 static int inaddr_to_sockaddr(char *ev, struct sockaddr_in *sa); 65 static int hwaddr_to_sockaddr(char *ev, struct sockaddr_dl *sa); 66 static int decode_nfshandle(char *ev, u_char *fh, int maxfh); 67 68 /* 69 * This structure must be filled in by a primary bootstrap or bootstrap 70 * server for a diskless/dataless machine. It is initialized below just 71 * to ensure that it is allocated to initialized data (.data not .bss). 72 */ 73 struct nfs_diskless nfs_diskless = { { { 0 } } }; 74 struct nfsv3_diskless nfsv3_diskless = { { { 0 } } }; 75 int nfs_diskless_valid = 0; 76 77 /* 78 * Validate/sanity check a rsize/wsize parameter. 79 */ 80 static int 81 checkrwsize(unsigned long v, const char *name) 82 { 83 /* 84 * 32K is used as an upper bound because most servers 85 * limit block size to satisfy IPv4's limit of 86 * 64K/reassembled packet. The lower bound is pretty 87 * much arbitrary. 88 */ 89 if (!(4 <= v && v <= 32*1024)) { 90 printf("nfs_parse_options: invalid %s %lu ignored\n", name, v); 91 return 0; 92 } else 93 return 1; 94 } 95 96 /* 97 * Parse mount options and apply them to the supplied 98 * nfs_diskless state. Used also by bootp/dhcp support. 99 */ 100 void 101 nfs_parse_options(const char *envopts, struct nfs_args *nd) 102 { 103 char *opts, *o, *otmp; 104 unsigned long v; 105 106 opts = strdup(envopts, M_TEMP); 107 otmp = opts; 108 while ((o = strsep(&otmp, ":;, ")) != NULL) { 109 if (*o == '\0') 110 ; /* Skip empty options. */ 111 else if (strcmp(o, "soft") == 0) 112 nd->flags |= NFSMNT_SOFT; 113 else if (strcmp(o, "intr") == 0) 114 nd->flags |= NFSMNT_INT; 115 else if (strcmp(o, "conn") == 0) 116 nd->flags |= NFSMNT_NOCONN; 117 else if (strcmp(o, "nolockd") == 0) 118 nd->flags |= NFSMNT_NOLOCKD; 119 else if (strcmp(o, "nocto") == 0) 120 nd->flags |= NFSMNT_NOCTO; 121 else if (strcmp(o, "nfsv2") == 0) 122 nd->flags &= ~(NFSMNT_NFSV3 | NFSMNT_NFSV4); 123 else if (strcmp(o, "nfsv3") == 0) { 124 nd->flags &= ~NFSMNT_NFSV4; 125 nd->flags |= NFSMNT_NFSV3; 126 } else if (strcmp(o, "tcp") == 0) 127 nd->sotype = SOCK_STREAM; 128 else if (strcmp(o, "udp") == 0) 129 nd->sotype = SOCK_DGRAM; 130 else if (strncmp(o, "rsize=", 6) == 0) { 131 v = strtoul(o+6, NULL, 10); 132 if (checkrwsize(v, "rsize")) { 133 nd->rsize = (int) v; 134 nd->flags |= NFSMNT_RSIZE; 135 } 136 } else if (strncmp(o, "wsize=", 6) == 0) { 137 v = strtoul(o+6, NULL, 10); 138 if (checkrwsize(v, "wsize")) { 139 nd->wsize = (int) v; 140 nd->flags |= NFSMNT_WSIZE; 141 } 142 } else 143 printf("%s: skipping unknown option \"%s\"\n", 144 __func__, o); 145 } 146 free(opts, M_TEMP); 147 } 148 149 static u_int 150 nfs_setup_diskless_ifa_cb(void *arg, struct sockaddr_dl *sdl, u_int count) 151 { 152 struct sockaddr_dl *ourdl = arg; 153 154 if ((sdl->sdl_type == ourdl->sdl_type) && 155 (sdl->sdl_alen == ourdl->sdl_alen) && 156 !bcmp(LLADDR(sdl), LLADDR(ourdl), sdl->sdl_alen)) 157 return (1); 158 159 return (0); 160 } 161 162 /* 163 * Populate the essential fields in the nfsv3_diskless structure. 164 * 165 * The loader is expected to export the following environment variables: 166 * 167 * boot.netif.name name of boot interface 168 * boot.netif.ip IP address on boot interface 169 * boot.netif.netmask netmask on boot interface 170 * boot.netif.gateway default gateway (optional) 171 * boot.netif.hwaddr hardware address of boot interface 172 * boot.netif.mtu interface mtu from bootp/dhcp (optional) 173 * boot.nfsroot.server IP address of root filesystem server 174 * boot.nfsroot.path path of the root filesystem on server 175 * boot.nfsroot.nfshandle NFS handle for root filesystem on server 176 * boot.nfsroot.nfshandlelen and length of this handle (for NFSv3 only) 177 * boot.nfsroot.options NFS options for the root filesystem 178 */ 179 void 180 nfs_setup_diskless(void) 181 { 182 struct epoch_tracker et; 183 struct if_iter iter; 184 struct nfs_diskless *nd = &nfs_diskless; 185 struct nfsv3_diskless *nd3 = &nfsv3_diskless; 186 if_t ifp; 187 struct sockaddr_dl ourdl; 188 struct sockaddr_in myaddr, netmask; 189 char *cp; 190 int cnt, fhlen, is_nfsv3; 191 uint32_t len; 192 time_t timeout_at; 193 u_int count; 194 195 if (nfs_diskless_valid != 0) 196 return; 197 198 /* get handle size. If this succeeds, it's an NFSv3 setup. */ 199 if ((cp = kern_getenv("boot.nfsroot.nfshandlelen")) != NULL) { 200 cnt = sscanf(cp, "%d", &len); 201 freeenv(cp); 202 if (cnt != 1 || len == 0 || len > NFSX_V3FHMAX) { 203 printf("nfs_diskless: bad NFS handle len\n"); 204 return; 205 } 206 nd3->root_fhsize = len; 207 is_nfsv3 = 1; 208 } else 209 is_nfsv3 = 0; 210 /* set up interface */ 211 if (inaddr_to_sockaddr("boot.netif.ip", &myaddr)) 212 return; 213 if (inaddr_to_sockaddr("boot.netif.netmask", &netmask)) { 214 printf("nfs_diskless: no netmask\n"); 215 return; 216 } 217 if (is_nfsv3 != 0) { 218 bcopy(&myaddr, &nd3->myif.ifra_addr, sizeof(myaddr)); 219 bcopy(&myaddr, &nd3->myif.ifra_broadaddr, sizeof(myaddr)); 220 ((struct sockaddr_in *) 221 &nd3->myif.ifra_broadaddr)->sin_addr.s_addr = 222 myaddr.sin_addr.s_addr | ~ netmask.sin_addr.s_addr; 223 bcopy(&netmask, &nd3->myif.ifra_mask, sizeof(netmask)); 224 } else { 225 bcopy(&myaddr, &nd->myif.ifra_addr, sizeof(myaddr)); 226 bcopy(&myaddr, &nd->myif.ifra_broadaddr, sizeof(myaddr)); 227 ((struct sockaddr_in *) 228 &nd->myif.ifra_broadaddr)->sin_addr.s_addr = 229 myaddr.sin_addr.s_addr | ~ netmask.sin_addr.s_addr; 230 bcopy(&netmask, &nd->myif.ifra_mask, sizeof(netmask)); 231 } 232 233 if (hwaddr_to_sockaddr("boot.netif.hwaddr", &ourdl)) { 234 printf("nfs_diskless: no hardware address\n"); 235 return; 236 } 237 timeout_at = time_uptime + NFS_IFACE_TIMEOUT_SECS; 238 retry: 239 CURVNET_SET(TD_TO_VNET(curthread)); 240 NET_EPOCH_ENTER(et); 241 242 for (ifp = if_iter_start(&iter); ifp != NULL; ifp = if_iter_next(&iter)) { 243 count = if_foreach_lladdr(ifp, nfs_setup_diskless_ifa_cb, &ourdl); 244 245 if (count > 0) 246 break; 247 248 } 249 if_iter_finish(&iter); 250 NET_EPOCH_EXIT(et); 251 CURVNET_RESTORE(); 252 if (cnt > 0) { 253 goto match_done; 254 } 255 256 if (time_uptime < timeout_at) { 257 pause("nfssdl", hz / 5); 258 goto retry; 259 } 260 printf("nfs_diskless: no interface\n"); 261 return; /* no matching interface */ 262 match_done: 263 kern_setenv("boot.netif.name", if_name(ifp)); 264 if (is_nfsv3 != 0) { 265 strlcpy(nd3->myif.ifra_name, if_name(ifp), 266 sizeof(nd3->myif.ifra_name)); 267 268 /* set up gateway */ 269 inaddr_to_sockaddr("boot.netif.gateway", &nd3->mygateway); 270 271 /* set up root mount */ 272 nd3->root_args.rsize = 32768; /* XXX tunable? */ 273 nd3->root_args.wsize = 32768; 274 nd3->root_args.sotype = SOCK_STREAM; 275 nd3->root_args.flags = (NFSMNT_NFSV3 | NFSMNT_WSIZE | 276 NFSMNT_RSIZE | NFSMNT_RESVPORT); 277 if (inaddr_to_sockaddr("boot.nfsroot.server", 278 &nd3->root_saddr)) { 279 printf("nfs_diskless: no server\n"); 280 return; 281 } 282 nd3->root_saddr.sin_port = htons(NFS_PORT); 283 fhlen = decode_nfshandle("boot.nfsroot.nfshandle", 284 &nd3->root_fh[0], NFSX_V3FHMAX); 285 if (fhlen == 0) { 286 printf("nfs_diskless: no NFS handle\n"); 287 return; 288 } 289 if (fhlen != nd3->root_fhsize) { 290 printf("nfs_diskless: bad NFS handle len=%d\n", fhlen); 291 return; 292 } 293 if ((cp = kern_getenv("boot.nfsroot.path")) != NULL) { 294 strncpy(nd3->root_hostnam, cp, MNAMELEN - 1); 295 freeenv(cp); 296 } 297 if ((cp = kern_getenv("boot.nfsroot.options")) != NULL) { 298 nfs_parse_options(cp, &nd3->root_args); 299 freeenv(cp); 300 } 301 302 nfs_diskless_valid = 3; 303 } else { 304 strlcpy(nd->myif.ifra_name, if_name(ifp), 305 sizeof(nd->myif.ifra_name)); 306 307 /* set up gateway */ 308 inaddr_to_sockaddr("boot.netif.gateway", &nd->mygateway); 309 310 /* set up root mount */ 311 nd->root_args.rsize = 8192; /* XXX tunable? */ 312 nd->root_args.wsize = 8192; 313 nd->root_args.sotype = SOCK_STREAM; 314 nd->root_args.flags = (NFSMNT_WSIZE | 315 NFSMNT_RSIZE | NFSMNT_RESVPORT); 316 if (inaddr_to_sockaddr("boot.nfsroot.server", 317 &nd->root_saddr)) { 318 printf("nfs_diskless: no server\n"); 319 return; 320 } 321 nd->root_saddr.sin_port = htons(NFS_PORT); 322 if (decode_nfshandle("boot.nfsroot.nfshandle", 323 &nd->root_fh[0], NFSX_V2FH) == 0) { 324 printf("nfs_diskless: no NFS handle\n"); 325 return; 326 } 327 if ((cp = kern_getenv("boot.nfsroot.path")) != NULL) { 328 strncpy(nd->root_hostnam, cp, MNAMELEN - 1); 329 freeenv(cp); 330 } 331 if ((cp = kern_getenv("boot.nfsroot.options")) != NULL) { 332 struct nfs_args args; 333 334 /* 335 * XXX yech, convert between old and current 336 * arg format 337 */ 338 args.flags = nd->root_args.flags; 339 args.sotype = nd->root_args.sotype; 340 args.rsize = nd->root_args.rsize; 341 args.wsize = nd->root_args.wsize; 342 nfs_parse_options(cp, &args); 343 nd->root_args.flags = args.flags; 344 nd->root_args.sotype = args.sotype; 345 nd->root_args.rsize = args.rsize; 346 nd->root_args.wsize = args.wsize; 347 freeenv(cp); 348 } 349 350 nfs_diskless_valid = 1; 351 } 352 } 353 354 static int 355 inaddr_to_sockaddr(char *ev, struct sockaddr_in *sa) 356 { 357 u_int32_t a[4]; 358 char *cp; 359 int count; 360 361 bzero(sa, sizeof(*sa)); 362 sa->sin_len = sizeof(*sa); 363 sa->sin_family = AF_INET; 364 365 if ((cp = kern_getenv(ev)) == NULL) 366 return (1); 367 count = sscanf(cp, "%d.%d.%d.%d", &a[0], &a[1], &a[2], &a[3]); 368 freeenv(cp); 369 if (count != 4) 370 return (1); 371 sa->sin_addr.s_addr = 372 htonl((a[0] << 24) | (a[1] << 16) | (a[2] << 8) | a[3]); 373 return (0); 374 } 375 376 static int 377 hwaddr_to_sockaddr(char *ev, struct sockaddr_dl *sa) 378 { 379 char *cp; 380 u_int32_t a[6]; 381 int count; 382 383 bzero(sa, sizeof(*sa)); 384 sa->sdl_len = sizeof(*sa); 385 sa->sdl_family = AF_LINK; 386 sa->sdl_type = IFT_ETHER; 387 sa->sdl_alen = ETHER_ADDR_LEN; 388 if ((cp = kern_getenv(ev)) == NULL) 389 return (1); 390 count = sscanf(cp, "%x:%x:%x:%x:%x:%x", 391 &a[0], &a[1], &a[2], &a[3], &a[4], &a[5]); 392 freeenv(cp); 393 if (count != 6) 394 return (1); 395 sa->sdl_data[0] = a[0]; 396 sa->sdl_data[1] = a[1]; 397 sa->sdl_data[2] = a[2]; 398 sa->sdl_data[3] = a[3]; 399 sa->sdl_data[4] = a[4]; 400 sa->sdl_data[5] = a[5]; 401 return (0); 402 } 403 404 static int 405 decode_nfshandle(char *ev, u_char *fh, int maxfh) 406 { 407 u_char *cp, *ep; 408 int len, val; 409 410 ep = cp = kern_getenv(ev); 411 if (cp == NULL) 412 return (0); 413 if ((strlen(cp) < 2) || (*cp != 'X')) { 414 freeenv(ep); 415 return (0); 416 } 417 len = 0; 418 cp++; 419 for (;;) { 420 if (*cp == 'X') { 421 freeenv(ep); 422 return (len); 423 } 424 if ((sscanf(cp, "%2x", &val) != 1) || (val > 0xff)) { 425 freeenv(ep); 426 return (0); 427 } 428 *(fh++) = val; 429 len++; 430 cp += 2; 431 if (len > maxfh) { 432 freeenv(ep); 433 return (0); 434 } 435 } 436 } 437 438 #if !defined(BOOTP_NFSROOT) 439 static void 440 nfs_rootconf(void) 441 { 442 443 nfs_setup_diskless(); 444 if (nfs_diskless_valid) 445 rootdevnames[0] = "nfs:"; 446 } 447 448 SYSINIT(cpu_rootconf, SI_SUB_ROOT_CONF, SI_ORDER_FIRST, nfs_rootconf, NULL); 449 #endif 450