1 /* $NetBSD: nfs_bootparam.c,v 1.15 1999/07/26 02:16:35 enami 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 "opt_nfs_boot.h" 44 45 #include <sys/param.h> 46 #include <sys/systm.h> 47 #include <sys/kernel.h> 48 #include <sys/conf.h> 49 #include <sys/device.h> 50 #include <sys/ioctl.h> 51 #include <sys/proc.h> 52 #include <sys/mount.h> 53 #include <sys/mbuf.h> 54 #include <sys/reboot.h> 55 #include <sys/socket.h> 56 #include <sys/socketvar.h> 57 58 #include <net/if.h> 59 #include <net/if_types.h> 60 #include <net/route.h> 61 #include <net/if_ether.h> 62 63 #include <netinet/in.h> 64 #include <netinet/if_inarp.h> 65 66 #include <nfs/rpcv2.h> 67 #include <nfs/krpc.h> 68 #include <nfs/xdr_subs.h> 69 70 #include <nfs/nfsproto.h> 71 #include <nfs/nfs.h> 72 #include <nfs/nfsmount.h> 73 #include <nfs/nfsdiskless.h> 74 75 #include "arp.h" 76 77 /* 78 * There are two implementations of NFS diskless boot. 79 * This implementation uses Sun RPC/bootparams, and the 80 * the other uses BOOTP (RFC951 - see nfs_bootdhcp.c). 81 * 82 * The Sun-style boot sequence goes as follows: 83 * (1) Use RARP to get our interface address 84 * (2) Use RPC/bootparam/whoami to get our hostname, 85 * our IP address, and the server's IP address. 86 * (3) Use RPC/bootparam/getfile to get the root path 87 * (4) Use RPC/mountd to get the root file handle 88 * (5) Use RPC/bootparam/getfile to get the swap path 89 * (6) Use RPC/mountd to get the swap file handle 90 */ 91 92 /* bootparam RPC */ 93 static int bp_whoami __P((struct sockaddr_in *bpsin, 94 struct in_addr *my_ip, struct in_addr *gw_ip)); 95 static int bp_getfile __P((struct sockaddr_in *bpsin, char *key, 96 struct nfs_dlmount *ndm)); 97 98 99 /* 100 * Get client name, gateway address, then 101 * get root and swap server:pathname info. 102 * RPCs: bootparam/whoami, bootparam/getfile 103 * 104 * Use the old broadcast address for the WHOAMI 105 * call because we do not yet know our netmask. 106 * The server address returned by the WHOAMI call 107 * is used for all subsequent booptaram RPCs. 108 */ 109 int 110 nfs_bootparam(nd, procp) 111 struct nfs_diskless *nd; 112 struct proc *procp; 113 { 114 struct ifnet *ifp = nd->nd_ifp; 115 struct in_addr my_ip, arps_ip, gw_ip; 116 struct sockaddr_in bp_sin; 117 struct sockaddr_in *sin; 118 #ifndef NFS_BOOTPARAM_NOGATEWAY 119 struct nfs_dlmount *gw_ndm = 0; 120 char *p; 121 u_int32_t mask; 122 #endif 123 int error; 124 125 /* 126 * Bring up the interface. (just set the "up" flag) 127 */ 128 error = nfs_boot_ifupdown(ifp, procp, 1); 129 if (error) { 130 printf("nfs_boot: SIFFLAGS, error=%d\n", error); 131 return (error); 132 } 133 134 error = EADDRNOTAVAIL; 135 #if NARP > 0 136 if (ifp->if_type == IFT_ETHER || ifp->if_type == IFT_FDDI) { 137 /* 138 * Do RARP for the interface address. 139 */ 140 error = revarpwhoarewe(ifp, &arps_ip, &my_ip); 141 } 142 #endif 143 if (error) { 144 printf("revarp failed, error=%d\n", error); 145 goto out; 146 } 147 148 nd->nd_myip.s_addr = my_ip.s_addr; 149 printf("nfs_boot: client_addr=%s", inet_ntoa(my_ip)); 150 printf(" (RARP from %s)\n", inet_ntoa(arps_ip)); 151 152 /* 153 * Do enough of ifconfig(8) so that the chosen interface 154 * can talk to the servers. (just set the address) 155 */ 156 error = nfs_boot_setaddress(ifp, procp, my_ip.s_addr, 157 INADDR_ANY, INADDR_ANY); 158 if (error) { 159 printf("nfs_boot: set ifaddr, error=%d\n", error); 160 goto out; 161 } 162 163 /* 164 * Get client name and gateway address. 165 * RPC: bootparam/whoami 166 * Use the old broadcast address for the WHOAMI 167 * call because we do not yet know our netmask. 168 * The server address returned by the WHOAMI call 169 * is used for all subsequent booptaram RPCs. 170 */ 171 sin = &bp_sin; 172 memset((caddr_t)sin, 0, sizeof(*sin)); 173 sin->sin_len = sizeof(*sin); 174 sin->sin_family = AF_INET; 175 sin->sin_addr.s_addr = INADDR_BROADCAST; 176 177 /* Do the RPC/bootparam/whoami. */ 178 error = bp_whoami(sin, &my_ip, &gw_ip); 179 if (error) { 180 printf("nfs_boot: bootparam whoami, error=%d\n", error); 181 goto delout; 182 } 183 printf("nfs_boot: server_addr=%s\n", inet_ntoa(sin->sin_addr)); 184 printf("nfs_boot: hostname=%s\n", hostname); 185 186 /* 187 * Now fetch the server:pathname strings and server IP 188 * for root and swap. Missing swap is not fatal. 189 */ 190 error = bp_getfile(sin, "root", &nd->nd_root); 191 if (error) { 192 printf("nfs_boot: bootparam get root: %d\n", error); 193 goto delout; 194 } 195 196 #ifndef NFS_BOOTPARAM_NOGATEWAY 197 gw_ndm = malloc(sizeof(*gw_ndm), M_NFSMNT, M_WAITOK); 198 memset((caddr_t)gw_ndm, 0, sizeof(*gw_ndm)); 199 error = bp_getfile(sin, "gateway", gw_ndm); 200 if (error) { 201 /* No gateway supplied. No error, but try fallback. */ 202 error = 0; 203 goto nogwrepl; 204 } 205 sin = (struct sockaddr_in *) &gw_ndm->ndm_saddr; 206 if (sin->sin_addr.s_addr == 0) 207 goto out; /* no gateway */ 208 209 /* OK, we have a gateway! */ 210 printf("nfs_boot: gateway=%s\n", inet_ntoa(sin->sin_addr)); 211 /* Just save it. Caller adds the route. */ 212 nd->nd_gwip = sin->sin_addr; 213 214 /* Look for a mask string after the colon. */ 215 p = strchr(gw_ndm->ndm_host, ':'); 216 if (p == 0) 217 goto out; /* no netmask */ 218 /* have pathname */ 219 p++; /* skip ':' */ 220 mask = inet_addr(p); /* libkern */ 221 if (mask == 0) 222 goto out; /* no netmask */ 223 224 /* Have a netmask too! Save it; update the I/F. */ 225 nd->nd_mask.s_addr = mask; 226 printf("nfs_boot: my_mask=%s\n", inet_ntoa(nd->nd_mask)); 227 (void) nfs_boot_deladdress(ifp, procp, my_ip.s_addr); 228 error = nfs_boot_setaddress(ifp, procp, my_ip.s_addr, 229 mask, INADDR_ANY); 230 if (error) { 231 printf("nfs_boot: set ifmask, error=%d\n", error); 232 goto out; 233 } 234 goto gwok; 235 nogwrepl: 236 #endif 237 #ifdef NFS_BOOT_GATEWAY 238 /* 239 * Note: we normally ignore the gateway address returned 240 * by the "bootparam/whoami" RPC above, because many old 241 * bootparam servers supply a bogus gateway value. 242 * 243 * These deficiencies in the bootparam RPC interface are 244 * circumvented by using the bootparam/getfile RPC. The 245 * parameter "gateway" is requested, and if its returned, 246 * we use the "server" part of the reply as the gateway, 247 * and use the "pathname" part of the reply as the mask. 248 * (The mask comes to us as a string.) 249 */ 250 if (gw_ip.s_addr) { 251 /* Our caller will add the route. */ 252 nd->nd_gwip = gw_ip; 253 } 254 #endif 255 256 delout: 257 if (error) 258 (void) nfs_boot_deladdress(ifp, procp, my_ip.s_addr); 259 out: 260 if (error) { 261 (void) nfs_boot_ifupdown(ifp, procp, 0); 262 nfs_boot_flushrt(ifp); 263 } 264 #ifndef NFS_BOOTPARAM_NOGATEWAY 265 gwok: 266 if (gw_ndm) 267 free(gw_ndm, M_NFSMNT); 268 #endif 269 return (error); 270 } 271 272 273 /* 274 * RPC: bootparam/whoami 275 * Given client IP address, get: 276 * client name (hostname) 277 * domain name (domainname) 278 * gateway address 279 * 280 * The hostname and domainname are set here for convenience. 281 * 282 * Note - bpsin is initialized to the broadcast address, 283 * and will be replaced with the bootparam server address 284 * after this call is complete. Have to use PMAP_PROC_CALL 285 * to make sure we get responses only from a servers that 286 * know about us (don't want to broadcast a getport call). 287 */ 288 static int 289 bp_whoami(bpsin, my_ip, gw_ip) 290 struct sockaddr_in *bpsin; 291 struct in_addr *my_ip; 292 struct in_addr *gw_ip; 293 { 294 /* RPC structures for PMAPPROC_CALLIT */ 295 struct whoami_call { 296 u_int32_t call_prog; 297 u_int32_t call_vers; 298 u_int32_t call_proc; 299 u_int32_t call_arglen; 300 } *call; 301 struct callit_reply { 302 u_int32_t port; 303 u_int32_t encap_len; 304 /* encapsulated data here */ 305 } *reply; 306 307 struct mbuf *m, *from; 308 struct sockaddr_in *sin; 309 int error, msg_len; 310 int16_t port; 311 312 /* 313 * Build request message for PMAPPROC_CALLIT. 314 */ 315 m = m_get(M_WAIT, MT_DATA); 316 call = mtod(m, struct whoami_call *); 317 m->m_len = sizeof(*call); 318 call->call_prog = txdr_unsigned(BOOTPARAM_PROG); 319 call->call_vers = txdr_unsigned(BOOTPARAM_VERS); 320 call->call_proc = txdr_unsigned(BOOTPARAM_WHOAMI); 321 322 /* 323 * append encapsulated data (client IP address) 324 */ 325 m->m_next = xdr_inaddr_encode(my_ip); 326 call->call_arglen = txdr_unsigned(m->m_next->m_len); 327 328 /* RPC: portmap/callit */ 329 bpsin->sin_port = htons(PMAPPORT); 330 from = NULL; 331 error = krpc_call(bpsin, PMAPPROG, PMAPVERS, 332 PMAPPROC_CALLIT, &m, &from); 333 if (error) 334 return error; 335 336 /* 337 * Parse result message. 338 */ 339 if (m->m_len < sizeof(*reply)) { 340 m = m_pullup(m, sizeof(*reply)); 341 if (m == NULL) 342 goto bad; 343 } 344 reply = mtod(m, struct callit_reply *); 345 port = fxdr_unsigned(u_int32_t, reply->port); 346 msg_len = fxdr_unsigned(u_int32_t, reply->encap_len); 347 m_adj(m, sizeof(*reply)); 348 349 /* 350 * Save bootparam server address 351 */ 352 sin = mtod(from, struct sockaddr_in *); 353 bpsin->sin_port = htons(port); 354 bpsin->sin_addr.s_addr = sin->sin_addr.s_addr; 355 356 /* client name */ 357 hostnamelen = MAXHOSTNAMELEN-1; 358 m = xdr_string_decode(m, hostname, &hostnamelen); 359 if (m == NULL) 360 goto bad; 361 362 /* domain name */ 363 domainnamelen = MAXHOSTNAMELEN-1; 364 m = xdr_string_decode(m, domainname, &domainnamelen); 365 if (m == NULL) 366 goto bad; 367 368 /* gateway address */ 369 m = xdr_inaddr_decode(m, gw_ip); 370 if (m == NULL) 371 goto bad; 372 373 /* success */ 374 goto out; 375 376 bad: 377 printf("nfs_boot: bootparam_whoami: bad reply\n"); 378 error = EBADRPC; 379 380 out: 381 if (from) 382 m_freem(from); 383 if (m) 384 m_freem(m); 385 return(error); 386 } 387 388 389 /* 390 * RPC: bootparam/getfile 391 * Given client name and file "key", get: 392 * server name 393 * server IP address 394 * server pathname 395 */ 396 static int 397 bp_getfile(bpsin, key, ndm) 398 struct sockaddr_in *bpsin; 399 char *key; 400 struct nfs_dlmount *ndm; 401 { 402 char pathname[MNAMELEN]; 403 struct in_addr inaddr; 404 struct sockaddr_in *sin; 405 struct mbuf *m; 406 char *serv_name; 407 int error, sn_len, path_len; 408 409 /* 410 * Build request message. 411 */ 412 413 /* client name (hostname) */ 414 m = xdr_string_encode(hostname, hostnamelen); 415 if (m == NULL) 416 return (ENOMEM); 417 418 /* key name (root or swap) */ 419 m->m_next = xdr_string_encode(key, strlen(key)); 420 if (m->m_next == NULL) 421 return (ENOMEM); 422 423 /* RPC: bootparam/getfile */ 424 error = krpc_call(bpsin, BOOTPARAM_PROG, BOOTPARAM_VERS, 425 BOOTPARAM_GETFILE, &m, NULL); 426 if (error) 427 return error; 428 429 /* 430 * Parse result message. 431 */ 432 433 /* server name */ 434 serv_name = &ndm->ndm_host[0]; 435 sn_len = sizeof(ndm->ndm_host) - 1; 436 m = xdr_string_decode(m, serv_name, &sn_len); 437 if (m == NULL) 438 goto bad; 439 440 /* server IP address (mountd/NFS) */ 441 m = xdr_inaddr_decode(m, &inaddr); 442 if (m == NULL) 443 goto bad; 444 445 /* server pathname */ 446 path_len = sizeof(pathname) - 1; 447 m = xdr_string_decode(m, pathname, &path_len); 448 if (m == NULL) 449 goto bad; 450 451 /* 452 * Store the results in the nfs_dlmount. 453 * The strings become "server:pathname" 454 */ 455 sin = (struct sockaddr_in *) &ndm->ndm_saddr; 456 memset((caddr_t)sin, 0, sizeof(*sin)); 457 sin->sin_len = sizeof(*sin); 458 sin->sin_family = AF_INET; 459 sin->sin_addr = inaddr; 460 if ((sn_len + 1 + path_len + 1) > sizeof(ndm->ndm_host)) { 461 printf("nfs_boot: getfile name too long\n"); 462 error = EIO; 463 goto out; 464 } 465 ndm->ndm_host[sn_len] = ':'; 466 memcpy(ndm->ndm_host + sn_len + 1, pathname, path_len + 1); 467 468 /* success */ 469 goto out; 470 471 bad: 472 printf("nfs_boot: bootparam_getfile: bad reply\n"); 473 error = EBADRPC; 474 475 out: 476 m_freem(m); 477 return(0); 478 } 479