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 /* 150 * Populate the essential fields in the nfsv3_diskless structure. 151 * 152 * The loader is expected to export the following environment variables: 153 * 154 * boot.netif.name name of boot interface 155 * boot.netif.ip IP address on boot interface 156 * boot.netif.netmask netmask on boot interface 157 * boot.netif.gateway default gateway (optional) 158 * boot.netif.hwaddr hardware address of boot interface 159 * boot.netif.mtu interface mtu from bootp/dhcp (optional) 160 * boot.nfsroot.server IP address of root filesystem server 161 * boot.nfsroot.path path of the root filesystem on server 162 * boot.nfsroot.nfshandle NFS handle for root filesystem on server 163 * boot.nfsroot.nfshandlelen and length of this handle (for NFSv3 only) 164 * boot.nfsroot.options NFS options for the root filesystem 165 */ 166 void 167 nfs_setup_diskless(void) 168 { 169 struct nfs_diskless *nd = &nfs_diskless; 170 struct nfsv3_diskless *nd3 = &nfsv3_diskless; 171 struct ifnet *ifp; 172 struct ifaddr *ifa; 173 struct sockaddr_dl *sdl, ourdl; 174 struct sockaddr_in myaddr, netmask; 175 char *cp; 176 int cnt, fhlen, is_nfsv3; 177 uint32_t len; 178 time_t timeout_at; 179 180 if (nfs_diskless_valid != 0) 181 return; 182 183 /* get handle size. If this succeeds, it's an NFSv3 setup. */ 184 if ((cp = kern_getenv("boot.nfsroot.nfshandlelen")) != NULL) { 185 cnt = sscanf(cp, "%d", &len); 186 freeenv(cp); 187 if (cnt != 1 || len == 0 || len > NFSX_V3FHMAX) { 188 printf("nfs_diskless: bad NFS handle len\n"); 189 return; 190 } 191 nd3->root_fhsize = len; 192 is_nfsv3 = 1; 193 } else 194 is_nfsv3 = 0; 195 /* set up interface */ 196 if (inaddr_to_sockaddr("boot.netif.ip", &myaddr)) 197 return; 198 if (inaddr_to_sockaddr("boot.netif.netmask", &netmask)) { 199 printf("nfs_diskless: no netmask\n"); 200 return; 201 } 202 if (is_nfsv3 != 0) { 203 bcopy(&myaddr, &nd3->myif.ifra_addr, sizeof(myaddr)); 204 bcopy(&myaddr, &nd3->myif.ifra_broadaddr, sizeof(myaddr)); 205 ((struct sockaddr_in *) 206 &nd3->myif.ifra_broadaddr)->sin_addr.s_addr = 207 myaddr.sin_addr.s_addr | ~ netmask.sin_addr.s_addr; 208 bcopy(&netmask, &nd3->myif.ifra_mask, sizeof(netmask)); 209 } else { 210 bcopy(&myaddr, &nd->myif.ifra_addr, sizeof(myaddr)); 211 bcopy(&myaddr, &nd->myif.ifra_broadaddr, sizeof(myaddr)); 212 ((struct sockaddr_in *) 213 &nd->myif.ifra_broadaddr)->sin_addr.s_addr = 214 myaddr.sin_addr.s_addr | ~ netmask.sin_addr.s_addr; 215 bcopy(&netmask, &nd->myif.ifra_mask, sizeof(netmask)); 216 } 217 218 if (hwaddr_to_sockaddr("boot.netif.hwaddr", &ourdl)) { 219 printf("nfs_diskless: no hardware address\n"); 220 return; 221 } 222 ifa = NULL; 223 timeout_at = time_uptime + NFS_IFACE_TIMEOUT_SECS; 224 retry: 225 CURVNET_SET(TD_TO_VNET(curthread)); 226 IFNET_RLOCK(); 227 CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) { 228 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 229 if (ifa->ifa_addr->sa_family == AF_LINK) { 230 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 231 if ((sdl->sdl_type == ourdl.sdl_type) && 232 (sdl->sdl_alen == ourdl.sdl_alen) && 233 !bcmp(LLADDR(sdl), 234 LLADDR(&ourdl), 235 sdl->sdl_alen)) { 236 IFNET_RUNLOCK(); 237 CURVNET_RESTORE(); 238 goto match_done; 239 } 240 } 241 } 242 } 243 IFNET_RUNLOCK(); 244 CURVNET_RESTORE(); 245 if (time_uptime < timeout_at) { 246 pause("nfssdl", hz / 5); 247 goto retry; 248 } 249 printf("nfs_diskless: no interface\n"); 250 return; /* no matching interface */ 251 match_done: 252 kern_setenv("boot.netif.name", ifp->if_xname); 253 if (is_nfsv3 != 0) { 254 strlcpy(nd3->myif.ifra_name, ifp->if_xname, 255 sizeof(nd3->myif.ifra_name)); 256 257 /* set up gateway */ 258 inaddr_to_sockaddr("boot.netif.gateway", &nd3->mygateway); 259 260 /* set up root mount */ 261 nd3->root_args.rsize = 32768; /* XXX tunable? */ 262 nd3->root_args.wsize = 32768; 263 nd3->root_args.sotype = SOCK_STREAM; 264 nd3->root_args.flags = (NFSMNT_NFSV3 | NFSMNT_WSIZE | 265 NFSMNT_RSIZE | NFSMNT_RESVPORT); 266 if (inaddr_to_sockaddr("boot.nfsroot.server", 267 &nd3->root_saddr)) { 268 printf("nfs_diskless: no server\n"); 269 return; 270 } 271 nd3->root_saddr.sin_port = htons(NFS_PORT); 272 fhlen = decode_nfshandle("boot.nfsroot.nfshandle", 273 &nd3->root_fh[0], NFSX_V3FHMAX); 274 if (fhlen == 0) { 275 printf("nfs_diskless: no NFS handle\n"); 276 return; 277 } 278 if (fhlen != nd3->root_fhsize) { 279 printf("nfs_diskless: bad NFS handle len=%d\n", fhlen); 280 return; 281 } 282 if ((cp = kern_getenv("boot.nfsroot.path")) != NULL) { 283 strncpy(nd3->root_hostnam, cp, MNAMELEN - 1); 284 freeenv(cp); 285 } 286 if ((cp = kern_getenv("boot.nfsroot.options")) != NULL) { 287 nfs_parse_options(cp, &nd3->root_args); 288 freeenv(cp); 289 } 290 291 nfs_diskless_valid = 3; 292 } else { 293 strlcpy(nd->myif.ifra_name, ifp->if_xname, 294 sizeof(nd->myif.ifra_name)); 295 296 /* set up gateway */ 297 inaddr_to_sockaddr("boot.netif.gateway", &nd->mygateway); 298 299 /* set up root mount */ 300 nd->root_args.rsize = 8192; /* XXX tunable? */ 301 nd->root_args.wsize = 8192; 302 nd->root_args.sotype = SOCK_STREAM; 303 nd->root_args.flags = (NFSMNT_WSIZE | 304 NFSMNT_RSIZE | NFSMNT_RESVPORT); 305 if (inaddr_to_sockaddr("boot.nfsroot.server", 306 &nd->root_saddr)) { 307 printf("nfs_diskless: no server\n"); 308 return; 309 } 310 nd->root_saddr.sin_port = htons(NFS_PORT); 311 if (decode_nfshandle("boot.nfsroot.nfshandle", 312 &nd->root_fh[0], NFSX_V2FH) == 0) { 313 printf("nfs_diskless: no NFS handle\n"); 314 return; 315 } 316 if ((cp = kern_getenv("boot.nfsroot.path")) != NULL) { 317 strncpy(nd->root_hostnam, cp, MNAMELEN - 1); 318 freeenv(cp); 319 } 320 if ((cp = kern_getenv("boot.nfsroot.options")) != NULL) { 321 struct nfs_args args; 322 323 /* 324 * XXX yech, convert between old and current 325 * arg format 326 */ 327 args.flags = nd->root_args.flags; 328 args.sotype = nd->root_args.sotype; 329 args.rsize = nd->root_args.rsize; 330 args.wsize = nd->root_args.wsize; 331 nfs_parse_options(cp, &args); 332 nd->root_args.flags = args.flags; 333 nd->root_args.sotype = args.sotype; 334 nd->root_args.rsize = args.rsize; 335 nd->root_args.wsize = args.wsize; 336 freeenv(cp); 337 } 338 339 nfs_diskless_valid = 1; 340 } 341 } 342 343 static int 344 inaddr_to_sockaddr(char *ev, struct sockaddr_in *sa) 345 { 346 u_int32_t a[4]; 347 char *cp; 348 int count; 349 350 bzero(sa, sizeof(*sa)); 351 sa->sin_len = sizeof(*sa); 352 sa->sin_family = AF_INET; 353 354 if ((cp = kern_getenv(ev)) == NULL) 355 return (1); 356 count = sscanf(cp, "%d.%d.%d.%d", &a[0], &a[1], &a[2], &a[3]); 357 freeenv(cp); 358 if (count != 4) 359 return (1); 360 sa->sin_addr.s_addr = 361 htonl((a[0] << 24) | (a[1] << 16) | (a[2] << 8) | a[3]); 362 return (0); 363 } 364 365 static int 366 hwaddr_to_sockaddr(char *ev, struct sockaddr_dl *sa) 367 { 368 char *cp; 369 u_int32_t a[6]; 370 int count; 371 372 bzero(sa, sizeof(*sa)); 373 sa->sdl_len = sizeof(*sa); 374 sa->sdl_family = AF_LINK; 375 sa->sdl_type = IFT_ETHER; 376 sa->sdl_alen = ETHER_ADDR_LEN; 377 if ((cp = kern_getenv(ev)) == NULL) 378 return (1); 379 count = sscanf(cp, "%x:%x:%x:%x:%x:%x", 380 &a[0], &a[1], &a[2], &a[3], &a[4], &a[5]); 381 freeenv(cp); 382 if (count != 6) 383 return (1); 384 sa->sdl_data[0] = a[0]; 385 sa->sdl_data[1] = a[1]; 386 sa->sdl_data[2] = a[2]; 387 sa->sdl_data[3] = a[3]; 388 sa->sdl_data[4] = a[4]; 389 sa->sdl_data[5] = a[5]; 390 return (0); 391 } 392 393 static int 394 decode_nfshandle(char *ev, u_char *fh, int maxfh) 395 { 396 u_char *cp, *ep; 397 int len, val; 398 399 ep = cp = kern_getenv(ev); 400 if (cp == NULL) 401 return (0); 402 if ((strlen(cp) < 2) || (*cp != 'X')) { 403 freeenv(ep); 404 return (0); 405 } 406 len = 0; 407 cp++; 408 for (;;) { 409 if (*cp == 'X') { 410 freeenv(ep); 411 return (len); 412 } 413 if ((sscanf(cp, "%2x", &val) != 1) || (val > 0xff)) { 414 freeenv(ep); 415 return (0); 416 } 417 *(fh++) = val; 418 len++; 419 cp += 2; 420 if (len > maxfh) { 421 freeenv(ep); 422 return (0); 423 } 424 } 425 } 426 427 #if !defined(BOOTP_NFSROOT) 428 static void 429 nfs_rootconf(void) 430 { 431 432 nfs_setup_diskless(); 433 if (nfs_diskless_valid) 434 rootdevnames[0] = "nfs:"; 435 } 436 437 SYSINIT(cpu_rootconf, SI_SUB_ROOT_CONF, SI_ORDER_FIRST, nfs_rootconf, NULL); 438 #endif 439 440