1 /* $NetBSD: nfs_bootparam.c,v 1.32 2008/04/28 20:24:10 martin 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 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 /* 33 * Support for NFS diskless booting, Sun-style (RPC/bootparams) 34 */ 35 36 #include <sys/cdefs.h> 37 __KERNEL_RCSID(0, "$NetBSD: nfs_bootparam.c,v 1.32 2008/04/28 20:24:10 martin Exp $"); 38 39 #include "opt_nfs_boot.h" 40 #include "opt_inet.h" 41 42 #include <sys/param.h> 43 #include <sys/systm.h> 44 #include <sys/kernel.h> 45 #include <sys/ioctl.h> 46 #include <sys/proc.h> 47 #include <sys/mount.h> 48 #include <sys/mbuf.h> 49 #include <sys/reboot.h> 50 #include <sys/socket.h> 51 #include <sys/socketvar.h> 52 53 #include <net/if.h> 54 #include <net/if_types.h> 55 #include <net/route.h> 56 #include <net/if_ether.h> 57 58 #include <netinet/in.h> 59 #include <netinet/if_inarp.h> 60 61 #include <nfs/rpcv2.h> 62 #include <nfs/krpc.h> 63 #include <nfs/xdr_subs.h> 64 65 #include <nfs/nfsproto.h> 66 #include <nfs/nfs.h> 67 #include <nfs/nfsmount.h> 68 #include <nfs/nfsdiskless.h> 69 #include <nfs/nfs_var.h> 70 71 #include "arp.h" 72 73 /* 74 * There are two implementations of NFS diskless boot. 75 * This implementation uses Sun RPC/bootparams, and the 76 * the other uses BOOTP (RFC951 - see nfs_bootdhcp.c). 77 * 78 * The Sun-style boot sequence goes as follows: 79 * (1) Use RARP to get our interface address 80 * (2) Use RPC/bootparam/whoami to get our hostname, 81 * our IP address, and the server's IP address. 82 * (3) Use RPC/bootparam/getfile to get the root path 83 * (4) Use RPC/mountd to get the root file handle 84 * (5) Use RPC/bootparam/getfile to get the swap path 85 * (6) Use RPC/mountd to get the swap file handle 86 */ 87 88 /* bootparam RPC */ 89 static int bp_whoami __P((struct sockaddr_in *bpsin, 90 struct in_addr *my_ip, struct in_addr *gw_ip, struct lwp *l)); 91 static int bp_getfile __P((struct sockaddr_in *bpsin, const char *key, 92 struct nfs_dlmount *ndm, struct lwp *l)); 93 94 95 /* 96 * Get client name, gateway address, then 97 * get root and swap server:pathname info. 98 * RPCs: bootparam/whoami, bootparam/getfile 99 * 100 * Use the old broadcast address for the WHOAMI 101 * call because we do not yet know our netmask. 102 * The server address returned by the WHOAMI call 103 * is used for all subsequent booptaram RPCs. 104 */ 105 int 106 nfs_bootparam(nd, lwp) 107 struct nfs_diskless *nd; 108 struct lwp *lwp; 109 { 110 struct ifnet *ifp = nd->nd_ifp; 111 struct in_addr my_ip, arps_ip, gw_ip; 112 struct sockaddr_in bp_sin; 113 struct sockaddr_in *sin; 114 #ifndef NFS_BOOTPARAM_NOGATEWAY 115 struct nfs_dlmount *gw_ndm = 0; 116 char *p; 117 u_int32_t mask; 118 #endif 119 int error; 120 121 /* 122 * Bring up the interface. (just set the "up" flag) 123 */ 124 error = nfs_boot_ifupdown(ifp, lwp, 1); 125 if (error) { 126 printf("nfs_boot: SIFFLAGS, error=%d\n", error); 127 return (error); 128 } 129 130 error = EADDRNOTAVAIL; 131 #ifdef INET 132 #if NARP > 0 133 if (ifp->if_type == IFT_ETHER || ifp->if_type == IFT_FDDI) { 134 /* 135 * Do RARP for the interface address. 136 */ 137 error = revarpwhoarewe(ifp, &arps_ip, &my_ip); 138 } 139 #endif 140 #endif 141 if (error) { 142 printf("revarp failed, error=%d\n", error); 143 goto out; 144 } 145 146 nd->nd_myip.s_addr = my_ip.s_addr; 147 printf("nfs_boot: client_addr=%s", inet_ntoa(my_ip)); 148 printf(" (RARP from %s)\n", inet_ntoa(arps_ip)); 149 150 /* 151 * Do enough of ifconfig(8) so that the chosen interface 152 * can talk to the servers. (just set the address) 153 */ 154 error = nfs_boot_setaddress(ifp, lwp, my_ip.s_addr, 155 INADDR_ANY, INADDR_ANY); 156 if (error) { 157 printf("nfs_boot: set ifaddr, error=%d\n", error); 158 goto out; 159 } 160 161 /* 162 * Get client name and gateway address. 163 * RPC: bootparam/whoami 164 * Use the old broadcast address for the WHOAMI 165 * call because we do not yet know our netmask. 166 * The server address returned by the WHOAMI call 167 * is used for all subsequent booptaram RPCs. 168 */ 169 sin = &bp_sin; 170 memset((void *)sin, 0, sizeof(*sin)); 171 sin->sin_len = sizeof(*sin); 172 sin->sin_family = AF_INET; 173 sin->sin_addr.s_addr = INADDR_BROADCAST; 174 175 /* Do the RPC/bootparam/whoami. */ 176 error = bp_whoami(sin, &my_ip, &gw_ip, lwp); 177 if (error) { 178 printf("nfs_boot: bootparam whoami, error=%d\n", error); 179 goto delout; 180 } 181 printf("nfs_boot: server_addr=%s\n", inet_ntoa(sin->sin_addr)); 182 printf("nfs_boot: hostname=%s\n", hostname); 183 184 /* 185 * Now fetch the server:pathname strings and server IP 186 * for root and swap. Missing swap is not fatal. 187 */ 188 error = bp_getfile(sin, "root", &nd->nd_root, lwp); 189 if (error) { 190 printf("nfs_boot: bootparam get root: %d\n", error); 191 goto delout; 192 } 193 194 #ifndef NFS_BOOTPARAM_NOGATEWAY 195 gw_ndm = kmem_alloc(sizeof(*gw_ndm), KM_SLEEP); 196 memset((void *)gw_ndm, 0, sizeof(*gw_ndm)); 197 error = bp_getfile(sin, "gateway", gw_ndm, lwp); 198 if (error) { 199 /* No gateway supplied. No error, but try fallback. */ 200 error = 0; 201 goto nogwrepl; 202 } 203 sin = (struct sockaddr_in *) &gw_ndm->ndm_saddr; 204 if (sin->sin_addr.s_addr == 0) 205 goto out; /* no gateway */ 206 207 /* OK, we have a gateway! */ 208 printf("nfs_boot: gateway=%s\n", inet_ntoa(sin->sin_addr)); 209 /* Just save it. Caller adds the route. */ 210 nd->nd_gwip = sin->sin_addr; 211 212 /* Look for a mask string after the colon. */ 213 p = strchr(gw_ndm->ndm_host, ':'); 214 if (p == 0) 215 goto out; /* no netmask */ 216 /* have pathname */ 217 p++; /* skip ':' */ 218 mask = inet_addr(p); /* libkern */ 219 if (mask == 0) 220 goto out; /* no netmask */ 221 222 /* Have a netmask too! Save it; update the I/F. */ 223 nd->nd_mask.s_addr = mask; 224 printf("nfs_boot: my_mask=%s\n", inet_ntoa(nd->nd_mask)); 225 (void) nfs_boot_deladdress(ifp, lwp, my_ip.s_addr); 226 error = nfs_boot_setaddress(ifp, lwp, my_ip.s_addr, 227 mask, INADDR_ANY); 228 if (error) { 229 printf("nfs_boot: set ifmask, error=%d\n", error); 230 goto out; 231 } 232 goto gwok; 233 nogwrepl: 234 #endif 235 #ifdef NFS_BOOT_GATEWAY 236 /* 237 * Note: we normally ignore the gateway address returned 238 * by the "bootparam/whoami" RPC above, because many old 239 * bootparam servers supply a bogus gateway value. 240 * 241 * These deficiencies in the bootparam RPC interface are 242 * circumvented by using the bootparam/getfile RPC. The 243 * parameter "gateway" is requested, and if its returned, 244 * we use the "server" part of the reply as the gateway, 245 * and use the "pathname" part of the reply as the mask. 246 * (The mask comes to us as a string.) 247 */ 248 if (gw_ip.s_addr) { 249 /* Our caller will add the route. */ 250 nd->nd_gwip = gw_ip; 251 } 252 #endif 253 254 delout: 255 if (error) 256 (void) nfs_boot_deladdress(ifp, lwp, my_ip.s_addr); 257 out: 258 if (error) { 259 (void) nfs_boot_ifupdown(ifp, lwp, 0); 260 nfs_boot_flushrt(ifp); 261 } 262 #ifndef NFS_BOOTPARAM_NOGATEWAY 263 gwok: 264 if (gw_ndm) 265 kmem_free(gw_ndm, sizeof(*gw_ndm)); 266 #endif 267 return (error); 268 } 269 270 271 /* 272 * RPC: bootparam/whoami 273 * Given client IP address, get: 274 * client name (hostname) 275 * domain name (domainname) 276 * gateway address 277 * 278 * The hostname and domainname are set here for convenience. 279 * 280 * Note - bpsin is initialized to the broadcast address, 281 * and will be replaced with the bootparam server address 282 * after this call is complete. Have to use PMAP_PROC_CALL 283 * to make sure we get responses only from a servers that 284 * know about us (don't want to broadcast a getport call). 285 */ 286 static int 287 bp_whoami(bpsin, my_ip, gw_ip, l) 288 struct sockaddr_in *bpsin; 289 struct in_addr *my_ip; 290 struct in_addr *gw_ip; 291 struct lwp *l; 292 { 293 /* RPC structures for PMAPPROC_CALLIT */ 294 struct whoami_call { 295 u_int32_t call_prog; 296 u_int32_t call_vers; 297 u_int32_t call_proc; 298 u_int32_t call_arglen; 299 } *call; 300 struct callit_reply { 301 u_int32_t port; 302 u_int32_t encap_len; 303 /* encapsulated data here */ 304 } *reply; 305 306 struct mbuf *m, *from; 307 struct sockaddr_in *sin; 308 int error; 309 int16_t port; 310 311 /* 312 * Build request message for PMAPPROC_CALLIT. 313 */ 314 m = m_get(M_WAIT, MT_DATA); 315 call = mtod(m, struct whoami_call *); 316 m->m_len = sizeof(*call); 317 call->call_prog = txdr_unsigned(BOOTPARAM_PROG); 318 call->call_vers = txdr_unsigned(BOOTPARAM_VERS); 319 call->call_proc = txdr_unsigned(BOOTPARAM_WHOAMI); 320 321 /* 322 * append encapsulated data (client IP address) 323 */ 324 m->m_next = xdr_inaddr_encode(my_ip); 325 call->call_arglen = txdr_unsigned(m->m_next->m_len); 326 327 /* RPC: portmap/callit */ 328 bpsin->sin_port = htons(PMAPPORT); 329 error = krpc_call(bpsin, PMAPPROG, PMAPVERS, 330 PMAPPROC_CALLIT, &m, &from, l); 331 if (error) { 332 m_freem(m); 333 return error; 334 } 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 m_adj(m, sizeof(*reply)); 347 348 /* 349 * Save bootparam server address 350 */ 351 sin = mtod(from, struct sockaddr_in *); 352 bpsin->sin_port = htons(port); 353 bpsin->sin_addr.s_addr = sin->sin_addr.s_addr; 354 355 /* client name */ 356 hostnamelen = MAXHOSTNAMELEN-1; 357 m = xdr_string_decode(m, hostname, &hostnamelen); 358 if (m == NULL) 359 goto bad; 360 361 /* domain name */ 362 domainnamelen = MAXHOSTNAMELEN-1; 363 m = xdr_string_decode(m, domainname, &domainnamelen); 364 if (m == NULL) 365 goto bad; 366 367 /* gateway address */ 368 m = xdr_inaddr_decode(m, gw_ip); 369 if (m == NULL) 370 goto bad; 371 372 /* success */ 373 goto out; 374 375 bad: 376 printf("nfs_boot: bootparam_whoami: bad reply\n"); 377 error = EBADRPC; 378 379 out: 380 m_freem(from); 381 if (m) 382 m_freem(m); 383 return(error); 384 } 385 386 387 /* 388 * RPC: bootparam/getfile 389 * Given client name and file "key", get: 390 * server name 391 * server IP address 392 * server pathname 393 */ 394 static int 395 bp_getfile(bpsin, key, ndm, l) 396 struct sockaddr_in *bpsin; 397 const char *key; 398 struct nfs_dlmount *ndm; 399 struct lwp *l; 400 { 401 char pathname[MNAMELEN]; 402 struct in_addr inaddr; 403 struct sockaddr_in *sin; 404 struct mbuf *m; 405 char *serv_name; 406 int error, sn_len, path_len; 407 408 /* 409 * Build request message. 410 */ 411 412 /* client name (hostname) */ 413 m = xdr_string_encode(hostname, hostnamelen); 414 if (m == NULL) 415 return (ENOMEM); 416 417 /* key name (root or swap) */ 418 /*XXXUNCONST*/ 419 m->m_next = xdr_string_encode(__UNCONST(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, l); 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((void *)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