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