1 /* $NetBSD: nfs_bootparam.c,v 1.17 2000/10/03 17:18:15 chs 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 #include "opt_inet.h" 45 46 #include <sys/param.h> 47 #include <sys/systm.h> 48 #include <sys/kernel.h> 49 #include <sys/conf.h> 50 #include <sys/device.h> 51 #include <sys/ioctl.h> 52 #include <sys/proc.h> 53 #include <sys/mount.h> 54 #include <sys/mbuf.h> 55 #include <sys/reboot.h> 56 #include <sys/socket.h> 57 #include <sys/socketvar.h> 58 59 #include <net/if.h> 60 #include <net/if_types.h> 61 #include <net/route.h> 62 #include <net/if_ether.h> 63 64 #include <netinet/in.h> 65 #include <netinet/if_inarp.h> 66 67 #include <nfs/rpcv2.h> 68 #include <nfs/krpc.h> 69 #include <nfs/xdr_subs.h> 70 71 #include <nfs/nfsproto.h> 72 #include <nfs/nfs.h> 73 #include <nfs/nfsmount.h> 74 #include <nfs/nfsdiskless.h> 75 76 #include "arp.h" 77 78 /* 79 * There are two implementations of NFS diskless boot. 80 * This implementation uses Sun RPC/bootparams, and the 81 * the other uses BOOTP (RFC951 - see nfs_bootdhcp.c). 82 * 83 * The Sun-style boot sequence goes as follows: 84 * (1) Use RARP to get our interface address 85 * (2) Use RPC/bootparam/whoami to get our hostname, 86 * our IP address, and the server's IP address. 87 * (3) Use RPC/bootparam/getfile to get the root path 88 * (4) Use RPC/mountd to get the root file handle 89 * (5) Use RPC/bootparam/getfile to get the swap path 90 * (6) Use RPC/mountd to get the swap file handle 91 */ 92 93 /* bootparam RPC */ 94 static int bp_whoami __P((struct sockaddr_in *bpsin, 95 struct in_addr *my_ip, struct in_addr *gw_ip)); 96 static int bp_getfile __P((struct sockaddr_in *bpsin, char *key, 97 struct nfs_dlmount *ndm)); 98 99 100 /* 101 * Get client name, gateway address, then 102 * get root and swap server:pathname info. 103 * RPCs: bootparam/whoami, bootparam/getfile 104 * 105 * Use the old broadcast address for the WHOAMI 106 * call because we do not yet know our netmask. 107 * The server address returned by the WHOAMI call 108 * is used for all subsequent booptaram RPCs. 109 */ 110 int 111 nfs_bootparam(nd, procp) 112 struct nfs_diskless *nd; 113 struct proc *procp; 114 { 115 struct ifnet *ifp = nd->nd_ifp; 116 struct in_addr my_ip, arps_ip, gw_ip; 117 struct sockaddr_in bp_sin; 118 struct sockaddr_in *sin; 119 #ifndef NFS_BOOTPARAM_NOGATEWAY 120 struct nfs_dlmount *gw_ndm = 0; 121 char *p; 122 u_int32_t mask; 123 #endif 124 int error; 125 126 /* 127 * Bring up the interface. (just set the "up" flag) 128 */ 129 error = nfs_boot_ifupdown(ifp, procp, 1); 130 if (error) { 131 printf("nfs_boot: SIFFLAGS, error=%d\n", error); 132 return (error); 133 } 134 135 error = EADDRNOTAVAIL; 136 #ifdef INET 137 #if NARP > 0 138 if (ifp->if_type == IFT_ETHER || ifp->if_type == IFT_FDDI) { 139 /* 140 * Do RARP for the interface address. 141 */ 142 error = revarpwhoarewe(ifp, &arps_ip, &my_ip); 143 } 144 #endif 145 #endif 146 if (error) { 147 printf("revarp failed, error=%d\n", error); 148 goto out; 149 } 150 151 nd->nd_myip.s_addr = my_ip.s_addr; 152 printf("nfs_boot: client_addr=%s", inet_ntoa(my_ip)); 153 printf(" (RARP from %s)\n", inet_ntoa(arps_ip)); 154 155 /* 156 * Do enough of ifconfig(8) so that the chosen interface 157 * can talk to the servers. (just set the address) 158 */ 159 error = nfs_boot_setaddress(ifp, procp, my_ip.s_addr, 160 INADDR_ANY, INADDR_ANY); 161 if (error) { 162 printf("nfs_boot: set ifaddr, error=%d\n", error); 163 goto out; 164 } 165 166 /* 167 * Get client name and gateway address. 168 * RPC: bootparam/whoami 169 * Use the old broadcast address for the WHOAMI 170 * call because we do not yet know our netmask. 171 * The server address returned by the WHOAMI call 172 * is used for all subsequent booptaram RPCs. 173 */ 174 sin = &bp_sin; 175 memset((caddr_t)sin, 0, sizeof(*sin)); 176 sin->sin_len = sizeof(*sin); 177 sin->sin_family = AF_INET; 178 sin->sin_addr.s_addr = INADDR_BROADCAST; 179 180 /* Do the RPC/bootparam/whoami. */ 181 error = bp_whoami(sin, &my_ip, &gw_ip); 182 if (error) { 183 printf("nfs_boot: bootparam whoami, error=%d\n", error); 184 goto delout; 185 } 186 printf("nfs_boot: server_addr=%s\n", inet_ntoa(sin->sin_addr)); 187 printf("nfs_boot: hostname=%s\n", hostname); 188 189 /* 190 * Now fetch the server:pathname strings and server IP 191 * for root and swap. Missing swap is not fatal. 192 */ 193 error = bp_getfile(sin, "root", &nd->nd_root); 194 if (error) { 195 printf("nfs_boot: bootparam get root: %d\n", error); 196 goto delout; 197 } 198 199 #ifndef NFS_BOOTPARAM_NOGATEWAY 200 gw_ndm = malloc(sizeof(*gw_ndm), M_NFSMNT, M_WAITOK); 201 memset((caddr_t)gw_ndm, 0, sizeof(*gw_ndm)); 202 error = bp_getfile(sin, "gateway", gw_ndm); 203 if (error) { 204 /* No gateway supplied. No error, but try fallback. */ 205 error = 0; 206 goto nogwrepl; 207 } 208 sin = (struct sockaddr_in *) &gw_ndm->ndm_saddr; 209 if (sin->sin_addr.s_addr == 0) 210 goto out; /* no gateway */ 211 212 /* OK, we have a gateway! */ 213 printf("nfs_boot: gateway=%s\n", inet_ntoa(sin->sin_addr)); 214 /* Just save it. Caller adds the route. */ 215 nd->nd_gwip = sin->sin_addr; 216 217 /* Look for a mask string after the colon. */ 218 p = strchr(gw_ndm->ndm_host, ':'); 219 if (p == 0) 220 goto out; /* no netmask */ 221 /* have pathname */ 222 p++; /* skip ':' */ 223 mask = inet_addr(p); /* libkern */ 224 if (mask == 0) 225 goto out; /* no netmask */ 226 227 /* Have a netmask too! Save it; update the I/F. */ 228 nd->nd_mask.s_addr = mask; 229 printf("nfs_boot: my_mask=%s\n", inet_ntoa(nd->nd_mask)); 230 (void) nfs_boot_deladdress(ifp, procp, my_ip.s_addr); 231 error = nfs_boot_setaddress(ifp, procp, my_ip.s_addr, 232 mask, INADDR_ANY); 233 if (error) { 234 printf("nfs_boot: set ifmask, error=%d\n", error); 235 goto out; 236 } 237 goto gwok; 238 nogwrepl: 239 #endif 240 #ifdef NFS_BOOT_GATEWAY 241 /* 242 * Note: we normally ignore the gateway address returned 243 * by the "bootparam/whoami" RPC above, because many old 244 * bootparam servers supply a bogus gateway value. 245 * 246 * These deficiencies in the bootparam RPC interface are 247 * circumvented by using the bootparam/getfile RPC. The 248 * parameter "gateway" is requested, and if its returned, 249 * we use the "server" part of the reply as the gateway, 250 * and use the "pathname" part of the reply as the mask. 251 * (The mask comes to us as a string.) 252 */ 253 if (gw_ip.s_addr) { 254 /* Our caller will add the route. */ 255 nd->nd_gwip = gw_ip; 256 } 257 #endif 258 259 delout: 260 if (error) 261 (void) nfs_boot_deladdress(ifp, procp, my_ip.s_addr); 262 out: 263 if (error) { 264 (void) nfs_boot_ifupdown(ifp, procp, 0); 265 nfs_boot_flushrt(ifp); 266 } 267 #ifndef NFS_BOOTPARAM_NOGATEWAY 268 gwok: 269 if (gw_ndm) 270 free(gw_ndm, M_NFSMNT); 271 #endif 272 return (error); 273 } 274 275 276 /* 277 * RPC: bootparam/whoami 278 * Given client IP address, get: 279 * client name (hostname) 280 * domain name (domainname) 281 * gateway address 282 * 283 * The hostname and domainname are set here for convenience. 284 * 285 * Note - bpsin is initialized to the broadcast address, 286 * and will be replaced with the bootparam server address 287 * after this call is complete. Have to use PMAP_PROC_CALL 288 * to make sure we get responses only from a servers that 289 * know about us (don't want to broadcast a getport call). 290 */ 291 static int 292 bp_whoami(bpsin, my_ip, gw_ip) 293 struct sockaddr_in *bpsin; 294 struct in_addr *my_ip; 295 struct in_addr *gw_ip; 296 { 297 /* RPC structures for PMAPPROC_CALLIT */ 298 struct whoami_call { 299 u_int32_t call_prog; 300 u_int32_t call_vers; 301 u_int32_t call_proc; 302 u_int32_t call_arglen; 303 } *call; 304 struct callit_reply { 305 u_int32_t port; 306 u_int32_t encap_len; 307 /* encapsulated data here */ 308 } *reply; 309 310 struct mbuf *m, *from; 311 struct sockaddr_in *sin; 312 int error, msg_len; 313 int16_t port; 314 315 /* 316 * Build request message for PMAPPROC_CALLIT. 317 */ 318 m = m_get(M_WAIT, MT_DATA); 319 call = mtod(m, struct whoami_call *); 320 m->m_len = sizeof(*call); 321 call->call_prog = txdr_unsigned(BOOTPARAM_PROG); 322 call->call_vers = txdr_unsigned(BOOTPARAM_VERS); 323 call->call_proc = txdr_unsigned(BOOTPARAM_WHOAMI); 324 325 /* 326 * append encapsulated data (client IP address) 327 */ 328 m->m_next = xdr_inaddr_encode(my_ip); 329 call->call_arglen = txdr_unsigned(m->m_next->m_len); 330 331 /* RPC: portmap/callit */ 332 bpsin->sin_port = htons(PMAPPORT); 333 from = NULL; 334 error = krpc_call(bpsin, PMAPPROG, PMAPVERS, 335 PMAPPROC_CALLIT, &m, &from); 336 if (error) 337 return error; 338 339 /* 340 * Parse result message. 341 */ 342 if (m->m_len < sizeof(*reply)) { 343 m = m_pullup(m, sizeof(*reply)); 344 if (m == NULL) 345 goto bad; 346 } 347 reply = mtod(m, struct callit_reply *); 348 port = fxdr_unsigned(u_int32_t, reply->port); 349 msg_len = fxdr_unsigned(u_int32_t, reply->encap_len); 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