1 /* $NetBSD: nfs_bootparam.c,v 1.20 2002/09/22 19:35:22 jdolecek Exp $ */ 2 3 /*- 4 * Copyright (c) 1995, 1997 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Adam Glass and 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 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the NetBSD 21 * Foundation, Inc. and its contributors. 22 * 4. Neither the name of The NetBSD Foundation nor the names of its 23 * contributors may be used to endorse or promote products derived 24 * from this software without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 29 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 * POSSIBILITY OF SUCH DAMAGE. 37 */ 38 39 /* 40 * Support for NFS diskless booting, Sun-style (RPC/bootparams) 41 */ 42 43 #include <sys/cdefs.h> 44 __KERNEL_RCSID(0, "$NetBSD: nfs_bootparam.c,v 1.20 2002/09/22 19:35:22 jdolecek Exp $"); 45 46 #include "opt_nfs_boot.h" 47 #include "opt_inet.h" 48 49 #include <sys/param.h> 50 #include <sys/systm.h> 51 #include <sys/kernel.h> 52 #include <sys/ioctl.h> 53 #include <sys/proc.h> 54 #include <sys/mount.h> 55 #include <sys/mbuf.h> 56 #include <sys/reboot.h> 57 #include <sys/socket.h> 58 #include <sys/socketvar.h> 59 60 #include <net/if.h> 61 #include <net/if_types.h> 62 #include <net/route.h> 63 #include <net/if_ether.h> 64 65 #include <netinet/in.h> 66 #include <netinet/if_inarp.h> 67 68 #include <nfs/rpcv2.h> 69 #include <nfs/krpc.h> 70 #include <nfs/xdr_subs.h> 71 72 #include <nfs/nfsproto.h> 73 #include <nfs/nfs.h> 74 #include <nfs/nfsmount.h> 75 #include <nfs/nfsdiskless.h> 76 77 #include "arp.h" 78 79 /* 80 * There are two implementations of NFS diskless boot. 81 * This implementation uses Sun RPC/bootparams, and the 82 * the other uses BOOTP (RFC951 - see nfs_bootdhcp.c). 83 * 84 * The Sun-style boot sequence goes as follows: 85 * (1) Use RARP to get our interface address 86 * (2) Use RPC/bootparam/whoami to get our hostname, 87 * our IP address, and the server's IP address. 88 * (3) Use RPC/bootparam/getfile to get the root path 89 * (4) Use RPC/mountd to get the root file handle 90 * (5) Use RPC/bootparam/getfile to get the swap path 91 * (6) Use RPC/mountd to get the swap file handle 92 */ 93 94 /* bootparam RPC */ 95 static int bp_whoami __P((struct sockaddr_in *bpsin, 96 struct in_addr *my_ip, struct in_addr *gw_ip)); 97 static int bp_getfile __P((struct sockaddr_in *bpsin, char *key, 98 struct nfs_dlmount *ndm)); 99 100 101 /* 102 * Get client name, gateway address, then 103 * get root and swap server:pathname info. 104 * RPCs: bootparam/whoami, bootparam/getfile 105 * 106 * Use the old broadcast address for the WHOAMI 107 * call because we do not yet know our netmask. 108 * The server address returned by the WHOAMI call 109 * is used for all subsequent booptaram RPCs. 110 */ 111 int 112 nfs_bootparam(nd, procp) 113 struct nfs_diskless *nd; 114 struct proc *procp; 115 { 116 struct ifnet *ifp = nd->nd_ifp; 117 struct in_addr my_ip, arps_ip, gw_ip; 118 struct sockaddr_in bp_sin; 119 struct sockaddr_in *sin; 120 #ifndef NFS_BOOTPARAM_NOGATEWAY 121 struct nfs_dlmount *gw_ndm = 0; 122 char *p; 123 u_int32_t mask; 124 #endif 125 int error; 126 127 /* 128 * Bring up the interface. (just set the "up" flag) 129 */ 130 error = nfs_boot_ifupdown(ifp, procp, 1); 131 if (error) { 132 printf("nfs_boot: SIFFLAGS, error=%d\n", error); 133 return (error); 134 } 135 136 error = EADDRNOTAVAIL; 137 #ifdef INET 138 #if NARP > 0 139 if (ifp->if_type == IFT_ETHER || ifp->if_type == IFT_FDDI) { 140 /* 141 * Do RARP for the interface address. 142 */ 143 error = revarpwhoarewe(ifp, &arps_ip, &my_ip); 144 } 145 #endif 146 #endif 147 if (error) { 148 printf("revarp failed, error=%d\n", error); 149 goto out; 150 } 151 152 nd->nd_myip.s_addr = my_ip.s_addr; 153 printf("nfs_boot: client_addr=%s", inet_ntoa(my_ip)); 154 printf(" (RARP from %s)\n", inet_ntoa(arps_ip)); 155 156 /* 157 * Do enough of ifconfig(8) so that the chosen interface 158 * can talk to the servers. (just set the address) 159 */ 160 error = nfs_boot_setaddress(ifp, procp, my_ip.s_addr, 161 INADDR_ANY, INADDR_ANY); 162 if (error) { 163 printf("nfs_boot: set ifaddr, error=%d\n", error); 164 goto out; 165 } 166 167 /* 168 * Get client name and gateway address. 169 * RPC: bootparam/whoami 170 * Use the old broadcast address for the WHOAMI 171 * call because we do not yet know our netmask. 172 * The server address returned by the WHOAMI call 173 * is used for all subsequent booptaram RPCs. 174 */ 175 sin = &bp_sin; 176 memset((caddr_t)sin, 0, sizeof(*sin)); 177 sin->sin_len = sizeof(*sin); 178 sin->sin_family = AF_INET; 179 sin->sin_addr.s_addr = INADDR_BROADCAST; 180 181 /* Do the RPC/bootparam/whoami. */ 182 error = bp_whoami(sin, &my_ip, &gw_ip); 183 if (error) { 184 printf("nfs_boot: bootparam whoami, error=%d\n", error); 185 goto delout; 186 } 187 printf("nfs_boot: server_addr=%s\n", inet_ntoa(sin->sin_addr)); 188 printf("nfs_boot: hostname=%s\n", hostname); 189 190 /* 191 * Now fetch the server:pathname strings and server IP 192 * for root and swap. Missing swap is not fatal. 193 */ 194 error = bp_getfile(sin, "root", &nd->nd_root); 195 if (error) { 196 printf("nfs_boot: bootparam get root: %d\n", error); 197 goto delout; 198 } 199 200 #ifndef NFS_BOOTPARAM_NOGATEWAY 201 gw_ndm = malloc(sizeof(*gw_ndm), M_NFSMNT, M_WAITOK); 202 memset((caddr_t)gw_ndm, 0, sizeof(*gw_ndm)); 203 error = bp_getfile(sin, "gateway", gw_ndm); 204 if (error) { 205 /* No gateway supplied. No error, but try fallback. */ 206 error = 0; 207 goto nogwrepl; 208 } 209 sin = (struct sockaddr_in *) &gw_ndm->ndm_saddr; 210 if (sin->sin_addr.s_addr == 0) 211 goto out; /* no gateway */ 212 213 /* OK, we have a gateway! */ 214 printf("nfs_boot: gateway=%s\n", inet_ntoa(sin->sin_addr)); 215 /* Just save it. Caller adds the route. */ 216 nd->nd_gwip = sin->sin_addr; 217 218 /* Look for a mask string after the colon. */ 219 p = strchr(gw_ndm->ndm_host, ':'); 220 if (p == 0) 221 goto out; /* no netmask */ 222 /* have pathname */ 223 p++; /* skip ':' */ 224 mask = inet_addr(p); /* libkern */ 225 if (mask == 0) 226 goto out; /* no netmask */ 227 228 /* Have a netmask too! Save it; update the I/F. */ 229 nd->nd_mask.s_addr = mask; 230 printf("nfs_boot: my_mask=%s\n", inet_ntoa(nd->nd_mask)); 231 (void) nfs_boot_deladdress(ifp, procp, my_ip.s_addr); 232 error = nfs_boot_setaddress(ifp, procp, my_ip.s_addr, 233 mask, INADDR_ANY); 234 if (error) { 235 printf("nfs_boot: set ifmask, error=%d\n", error); 236 goto out; 237 } 238 goto gwok; 239 nogwrepl: 240 #endif 241 #ifdef NFS_BOOT_GATEWAY 242 /* 243 * Note: we normally ignore the gateway address returned 244 * by the "bootparam/whoami" RPC above, because many old 245 * bootparam servers supply a bogus gateway value. 246 * 247 * These deficiencies in the bootparam RPC interface are 248 * circumvented by using the bootparam/getfile RPC. The 249 * parameter "gateway" is requested, and if its returned, 250 * we use the "server" part of the reply as the gateway, 251 * and use the "pathname" part of the reply as the mask. 252 * (The mask comes to us as a string.) 253 */ 254 if (gw_ip.s_addr) { 255 /* Our caller will add the route. */ 256 nd->nd_gwip = gw_ip; 257 } 258 #endif 259 260 delout: 261 if (error) 262 (void) nfs_boot_deladdress(ifp, procp, my_ip.s_addr); 263 out: 264 if (error) { 265 (void) nfs_boot_ifupdown(ifp, procp, 0); 266 nfs_boot_flushrt(ifp); 267 } 268 #ifndef NFS_BOOTPARAM_NOGATEWAY 269 gwok: 270 if (gw_ndm) 271 free(gw_ndm, M_NFSMNT); 272 #endif 273 return (error); 274 } 275 276 277 /* 278 * RPC: bootparam/whoami 279 * Given client IP address, get: 280 * client name (hostname) 281 * domain name (domainname) 282 * gateway address 283 * 284 * The hostname and domainname are set here for convenience. 285 * 286 * Note - bpsin is initialized to the broadcast address, 287 * and will be replaced with the bootparam server address 288 * after this call is complete. Have to use PMAP_PROC_CALL 289 * to make sure we get responses only from a servers that 290 * know about us (don't want to broadcast a getport call). 291 */ 292 static int 293 bp_whoami(bpsin, my_ip, gw_ip) 294 struct sockaddr_in *bpsin; 295 struct in_addr *my_ip; 296 struct in_addr *gw_ip; 297 { 298 /* RPC structures for PMAPPROC_CALLIT */ 299 struct whoami_call { 300 u_int32_t call_prog; 301 u_int32_t call_vers; 302 u_int32_t call_proc; 303 u_int32_t call_arglen; 304 } *call; 305 struct callit_reply { 306 u_int32_t port; 307 u_int32_t encap_len; 308 /* encapsulated data here */ 309 } *reply; 310 311 struct mbuf *m, *from; 312 struct sockaddr_in *sin; 313 int error; 314 int16_t port; 315 316 /* 317 * Build request message for PMAPPROC_CALLIT. 318 */ 319 m = m_get(M_WAIT, MT_DATA); 320 call = mtod(m, struct whoami_call *); 321 m->m_len = sizeof(*call); 322 call->call_prog = txdr_unsigned(BOOTPARAM_PROG); 323 call->call_vers = txdr_unsigned(BOOTPARAM_VERS); 324 call->call_proc = txdr_unsigned(BOOTPARAM_WHOAMI); 325 326 /* 327 * append encapsulated data (client IP address) 328 */ 329 m->m_next = xdr_inaddr_encode(my_ip); 330 call->call_arglen = txdr_unsigned(m->m_next->m_len); 331 332 /* RPC: portmap/callit */ 333 bpsin->sin_port = htons(PMAPPORT); 334 from = NULL; 335 error = krpc_call(bpsin, PMAPPROG, PMAPVERS, 336 PMAPPROC_CALLIT, &m, &from); 337 if (error) 338 return error; 339 340 /* 341 * Parse result message. 342 */ 343 if (m->m_len < sizeof(*reply)) { 344 m = m_pullup(m, sizeof(*reply)); 345 if (m == NULL) 346 goto bad; 347 } 348 reply = mtod(m, struct callit_reply *); 349 port = fxdr_unsigned(u_int32_t, reply->port); 350 m_adj(m, sizeof(*reply)); 351 352 /* 353 * Save bootparam server address 354 */ 355 sin = mtod(from, struct sockaddr_in *); 356 bpsin->sin_port = htons(port); 357 bpsin->sin_addr.s_addr = sin->sin_addr.s_addr; 358 359 /* client name */ 360 hostnamelen = MAXHOSTNAMELEN-1; 361 m = xdr_string_decode(m, hostname, &hostnamelen); 362 if (m == NULL) 363 goto bad; 364 365 /* domain name */ 366 domainnamelen = MAXHOSTNAMELEN-1; 367 m = xdr_string_decode(m, domainname, &domainnamelen); 368 if (m == NULL) 369 goto bad; 370 371 /* gateway address */ 372 m = xdr_inaddr_decode(m, gw_ip); 373 if (m == NULL) 374 goto bad; 375 376 /* success */ 377 goto out; 378 379 bad: 380 printf("nfs_boot: bootparam_whoami: bad reply\n"); 381 error = EBADRPC; 382 383 out: 384 if (from) 385 m_freem(from); 386 if (m) 387 m_freem(m); 388 return(error); 389 } 390 391 392 /* 393 * RPC: bootparam/getfile 394 * Given client name and file "key", get: 395 * server name 396 * server IP address 397 * server pathname 398 */ 399 static int 400 bp_getfile(bpsin, key, ndm) 401 struct sockaddr_in *bpsin; 402 char *key; 403 struct nfs_dlmount *ndm; 404 { 405 char pathname[MNAMELEN]; 406 struct in_addr inaddr; 407 struct sockaddr_in *sin; 408 struct mbuf *m; 409 char *serv_name; 410 int error, sn_len, path_len; 411 412 /* 413 * Build request message. 414 */ 415 416 /* client name (hostname) */ 417 m = xdr_string_encode(hostname, hostnamelen); 418 if (m == NULL) 419 return (ENOMEM); 420 421 /* key name (root or swap) */ 422 m->m_next = xdr_string_encode(key, strlen(key)); 423 if (m->m_next == NULL) 424 return (ENOMEM); 425 426 /* RPC: bootparam/getfile */ 427 error = krpc_call(bpsin, BOOTPARAM_PROG, BOOTPARAM_VERS, 428 BOOTPARAM_GETFILE, &m, NULL); 429 if (error) 430 return error; 431 432 /* 433 * Parse result message. 434 */ 435 436 /* server name */ 437 serv_name = &ndm->ndm_host[0]; 438 sn_len = sizeof(ndm->ndm_host) - 1; 439 m = xdr_string_decode(m, serv_name, &sn_len); 440 if (m == NULL) 441 goto bad; 442 443 /* server IP address (mountd/NFS) */ 444 m = xdr_inaddr_decode(m, &inaddr); 445 if (m == NULL) 446 goto bad; 447 448 /* server pathname */ 449 path_len = sizeof(pathname) - 1; 450 m = xdr_string_decode(m, pathname, &path_len); 451 if (m == NULL) 452 goto bad; 453 454 /* 455 * Store the results in the nfs_dlmount. 456 * The strings become "server:pathname" 457 */ 458 sin = (struct sockaddr_in *) &ndm->ndm_saddr; 459 memset((caddr_t)sin, 0, sizeof(*sin)); 460 sin->sin_len = sizeof(*sin); 461 sin->sin_family = AF_INET; 462 sin->sin_addr = inaddr; 463 if ((sn_len + 1 + path_len + 1) > sizeof(ndm->ndm_host)) { 464 printf("nfs_boot: getfile name too long\n"); 465 error = EIO; 466 goto out; 467 } 468 ndm->ndm_host[sn_len] = ':'; 469 memcpy(ndm->ndm_host + sn_len + 1, pathname, path_len + 1); 470 471 /* success */ 472 goto out; 473 474 bad: 475 printf("nfs_boot: bootparam_getfile: bad reply\n"); 476 error = EBADRPC; 477 478 out: 479 m_freem(m); 480 return(0); 481 } 482