nfs_bootparam.c revision 1.35
1 /* $NetBSD: nfs_bootparam.c,v 1.35 2008/11/19 18:36:09 ad 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 1.35 2008/11/19 18:36:09 ad Exp $"); 38 39 #ifdef _KERNEL_OPT 40 #include "opt_nfs_boot.h" 41 #include "arp.h" 42 #endif 43 44 #include <sys/param.h> 45 #include <sys/systm.h> 46 #include <sys/kernel.h> 47 #include <sys/ioctl.h> 48 #include <sys/proc.h> 49 #include <sys/mount.h> 50 #include <sys/mbuf.h> 51 #include <sys/reboot.h> 52 #include <sys/socket.h> 53 #include <sys/socketvar.h> 54 55 #include <net/if.h> 56 #include <net/if_types.h> 57 #include <net/route.h> 58 #include <net/if_ether.h> 59 60 #include <netinet/in.h> 61 #include <netinet/if_inarp.h> 62 63 #include <nfs/rpcv2.h> 64 #include <nfs/krpc.h> 65 #include <nfs/xdr_subs.h> 66 67 #include <nfs/nfsproto.h> 68 #include <nfs/nfs.h> 69 #include <nfs/nfsmount.h> 70 #include <nfs/nfsdiskless.h> 71 #include <nfs/nfs_var.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 (struct sockaddr_in *bpsin, 90 struct in_addr *my_ip, struct in_addr *gw_ip, struct lwp *l); 91 static int bp_getfile (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(struct nfs_diskless *nd, struct lwp *lwp, int *flags) 107 { 108 struct ifnet *ifp = nd->nd_ifp; 109 struct in_addr my_ip, arps_ip, gw_ip; 110 struct sockaddr_in bp_sin; 111 struct sockaddr_in *sin; 112 #ifndef NFS_BOOTPARAM_NOGATEWAY 113 struct nfs_dlmount *gw_ndm = 0; 114 char *p; 115 u_int32_t mask; 116 #endif 117 int error; 118 119 /* 120 * Bring up the interface. (just set the "up" flag) 121 */ 122 error = nfs_boot_ifupdown(ifp, lwp, 1); 123 if (error) { 124 printf("nfs_boot: SIFFLAGS, error=%d\n", error); 125 return (error); 126 } 127 128 error = EADDRNOTAVAIL; 129 #if NARP > 0 130 if (ifp->if_type == IFT_ETHER || ifp->if_type == IFT_FDDI) { 131 /* 132 * Do RARP for the interface address. 133 */ 134 error = revarpwhoarewe(ifp, &arps_ip, &my_ip); 135 } 136 #endif 137 if (error) { 138 printf("revarp failed, error=%d\n", error); 139 goto out; 140 } 141 142 if (!(*flags & NFS_BOOT_HAS_MYIP)) { 143 nd->nd_myip.s_addr = my_ip.s_addr; 144 printf("nfs_boot: client_addr=%s", inet_ntoa(my_ip)); 145 printf(" (RARP from %s)\n", inet_ntoa(arps_ip)); 146 *flags |= NFS_BOOT_HAS_MYIP; 147 } 148 149 /* 150 * Do enough of ifconfig(8) so that the chosen interface 151 * can talk to the servers. (just set the address) 152 */ 153 error = nfs_boot_setaddress(ifp, lwp, my_ip.s_addr, 154 INADDR_ANY, INADDR_ANY); 155 if (error) { 156 printf("nfs_boot: set ifaddr, error=%d\n", error); 157 goto out; 158 } 159 160 /* 161 * Get client name and gateway address. 162 * RPC: bootparam/whoami 163 * Use the old broadcast address for the WHOAMI 164 * call because we do not yet know our netmask. 165 * The server address returned by the WHOAMI call 166 * is used for all subsequent booptaram RPCs. 167 */ 168 sin = &bp_sin; 169 memset((void *)sin, 0, sizeof(*sin)); 170 sin->sin_len = sizeof(*sin); 171 sin->sin_family = AF_INET; 172 sin->sin_addr.s_addr = INADDR_BROADCAST; 173 174 /* Do the RPC/bootparam/whoami. */ 175 error = bp_whoami(sin, &my_ip, &gw_ip, lwp); 176 if (error) { 177 printf("nfs_boot: bootparam whoami, error=%d\n", error); 178 goto delout; 179 } 180 printf("nfs_boot: server_addr=%s\n", inet_ntoa(sin->sin_addr)); 181 printf("nfs_boot: hostname=%s\n", hostname); 182 183 /* 184 * Now fetch the server:pathname strings and server IP 185 * for root and swap. Missing swap is not fatal. 186 */ 187 error = bp_getfile(sin, "root", &nd->nd_root, lwp); 188 if (error) { 189 printf("nfs_boot: bootparam get root: %d\n", error); 190 goto delout; 191 } 192 193 #ifndef NFS_BOOTPARAM_NOGATEWAY 194 gw_ndm = kmem_alloc(sizeof(*gw_ndm), KM_SLEEP); 195 memset((void *)gw_ndm, 0, sizeof(*gw_ndm)); 196 error = bp_getfile(sin, "gateway", gw_ndm, lwp); 197 if (error) { 198 /* No gateway supplied. No error, but try fallback. */ 199 error = 0; 200 goto nogwrepl; 201 } 202 sin = (struct sockaddr_in *) &gw_ndm->ndm_saddr; 203 if (sin->sin_addr.s_addr == 0) 204 goto out; /* no gateway */ 205 206 /* OK, we have a gateway! */ 207 printf("nfs_boot: gateway=%s\n", inet_ntoa(sin->sin_addr)); 208 /* Just save it. Caller adds the route. */ 209 nd->nd_gwip = sin->sin_addr; 210 211 /* Look for a mask string after the colon. */ 212 p = strchr(gw_ndm->ndm_host, ':'); 213 if (p == 0) 214 goto out; /* no netmask */ 215 /* have pathname */ 216 p++; /* skip ':' */ 217 mask = inet_addr(p); /* libkern */ 218 if (mask == 0) 219 goto out; /* no netmask */ 220 221 /* Have a netmask too! Save it; update the I/F. */ 222 nd->nd_mask.s_addr = mask; 223 printf("nfs_boot: my_mask=%s\n", inet_ntoa(nd->nd_mask)); 224 (void) nfs_boot_deladdress(ifp, lwp, my_ip.s_addr); 225 error = nfs_boot_setaddress(ifp, lwp, my_ip.s_addr, 226 mask, INADDR_ANY); 227 if (error) { 228 printf("nfs_boot: set ifmask, error=%d\n", error); 229 goto out; 230 } 231 goto gwok; 232 nogwrepl: 233 #endif 234 #ifdef NFS_BOOT_GATEWAY 235 /* 236 * Note: we normally ignore the gateway address returned 237 * by the "bootparam/whoami" RPC above, because many old 238 * bootparam servers supply a bogus gateway value. 239 * 240 * These deficiencies in the bootparam RPC interface are 241 * circumvented by using the bootparam/getfile RPC. The 242 * parameter "gateway" is requested, and if its returned, 243 * we use the "server" part of the reply as the gateway, 244 * and use the "pathname" part of the reply as the mask. 245 * (The mask comes to us as a string.) 246 */ 247 if (gw_ip.s_addr) { 248 /* Our caller will add the route. */ 249 nd->nd_gwip = gw_ip; 250 } 251 #endif 252 253 delout: 254 if (error) 255 (void) nfs_boot_deladdress(ifp, lwp, my_ip.s_addr); 256 out: 257 if (error) { 258 (void) nfs_boot_ifupdown(ifp, lwp, 0); 259 nfs_boot_flushrt(ifp); 260 } 261 #ifndef NFS_BOOTPARAM_NOGATEWAY 262 gwok: 263 if (gw_ndm) 264 kmem_free(gw_ndm, sizeof(*gw_ndm)); 265 #endif 266 if ((*flags & NFS_BOOT_ALLINFO) != NFS_BOOT_ALLINFO) 267 return error ? error : EADDRNOTAVAIL; 268 269 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(struct sockaddr_in *bpsin, struct in_addr *my_ip, 290 struct in_addr *gw_ip, struct lwp *l) 291 { 292 /* RPC structures for PMAPPROC_CALLIT */ 293 struct whoami_call { 294 u_int32_t call_prog; 295 u_int32_t call_vers; 296 u_int32_t call_proc; 297 u_int32_t call_arglen; 298 } *call; 299 struct callit_reply { 300 u_int32_t port; 301 u_int32_t encap_len; 302 /* encapsulated data here */ 303 } *reply; 304 305 struct mbuf *m, *from; 306 struct sockaddr_in *sin; 307 int error; 308 int16_t port; 309 310 /* 311 * Build request message for PMAPPROC_CALLIT. 312 */ 313 m = m_get(M_WAIT, MT_DATA); 314 call = mtod(m, struct whoami_call *); 315 m->m_len = sizeof(*call); 316 call->call_prog = txdr_unsigned(BOOTPARAM_PROG); 317 call->call_vers = txdr_unsigned(BOOTPARAM_VERS); 318 call->call_proc = txdr_unsigned(BOOTPARAM_WHOAMI); 319 320 /* 321 * append encapsulated data (client IP address) 322 */ 323 m->m_next = xdr_inaddr_encode(my_ip); 324 call->call_arglen = txdr_unsigned(m->m_next->m_len); 325 326 /* RPC: portmap/callit */ 327 bpsin->sin_port = htons(PMAPPORT); 328 error = krpc_call(bpsin, PMAPPROG, PMAPVERS, 329 PMAPPROC_CALLIT, &m, &from, l); 330 if (error) { 331 m_freem(m); 332 return error; 333 } 334 335 /* 336 * Parse result message. 337 */ 338 if (m->m_len < sizeof(*reply)) { 339 m = m_pullup(m, sizeof(*reply)); 340 if (m == NULL) 341 goto bad; 342 } 343 reply = mtod(m, struct callit_reply *); 344 port = fxdr_unsigned(u_int32_t, reply->port); 345 m_adj(m, sizeof(*reply)); 346 347 /* 348 * Save bootparam server address 349 */ 350 sin = mtod(from, struct sockaddr_in *); 351 bpsin->sin_port = htons(port); 352 bpsin->sin_addr.s_addr = sin->sin_addr.s_addr; 353 354 /* client name */ 355 hostnamelen = MAXHOSTNAMELEN-1; 356 m = xdr_string_decode(m, hostname, &hostnamelen); 357 if (m == NULL) 358 goto bad; 359 360 /* domain name */ 361 domainnamelen = MAXHOSTNAMELEN-1; 362 m = xdr_string_decode(m, domainname, &domainnamelen); 363 if (m == NULL) 364 goto bad; 365 366 /* gateway address */ 367 m = xdr_inaddr_decode(m, gw_ip); 368 if (m == NULL) 369 goto bad; 370 371 /* success */ 372 goto out; 373 374 bad: 375 printf("nfs_boot: bootparam_whoami: bad reply\n"); 376 error = EBADRPC; 377 378 out: 379 m_freem(from); 380 if (m) 381 m_freem(m); 382 return(error); 383 } 384 385 386 /* 387 * RPC: bootparam/getfile 388 * Given client name and file "key", get: 389 * server name 390 * server IP address 391 * server pathname 392 */ 393 static int 394 bp_getfile(struct sockaddr_in *bpsin, const char *key, 395 struct nfs_dlmount *ndm, struct lwp *l) 396 { 397 char pathname[MNAMELEN]; 398 struct in_addr inaddr; 399 struct sockaddr_in *sin; 400 struct mbuf *m; 401 char *serv_name; 402 int error, sn_len, path_len; 403 404 /* 405 * Build request message. 406 */ 407 408 /* client name (hostname) */ 409 m = xdr_string_encode(hostname, hostnamelen); 410 if (m == NULL) 411 return (ENOMEM); 412 413 /* key name (root or swap) */ 414 /*XXXUNCONST*/ 415 m->m_next = xdr_string_encode(__UNCONST(key), strlen(key)); 416 if (m->m_next == NULL) 417 return (ENOMEM); 418 419 /* RPC: bootparam/getfile */ 420 error = krpc_call(bpsin, BOOTPARAM_PROG, BOOTPARAM_VERS, 421 BOOTPARAM_GETFILE, &m, NULL, l); 422 if (error) 423 return error; 424 425 /* 426 * Parse result message. 427 */ 428 429 /* server name */ 430 serv_name = &ndm->ndm_host[0]; 431 sn_len = sizeof(ndm->ndm_host) - 1; 432 m = xdr_string_decode(m, serv_name, &sn_len); 433 if (m == NULL) 434 goto bad; 435 436 /* server IP address (mountd/NFS) */ 437 m = xdr_inaddr_decode(m, &inaddr); 438 if (m == NULL) 439 goto bad; 440 441 /* server pathname */ 442 path_len = sizeof(pathname) - 1; 443 m = xdr_string_decode(m, pathname, &path_len); 444 if (m == NULL) 445 goto bad; 446 447 /* 448 * Store the results in the nfs_dlmount. 449 * The strings become "server:pathname" 450 */ 451 sin = (struct sockaddr_in *) &ndm->ndm_saddr; 452 memset((void *)sin, 0, sizeof(*sin)); 453 sin->sin_len = sizeof(*sin); 454 sin->sin_family = AF_INET; 455 sin->sin_addr = inaddr; 456 if ((sn_len + 1 + path_len + 1) > sizeof(ndm->ndm_host)) { 457 printf("nfs_boot: getfile name too long\n"); 458 error = EIO; 459 goto out; 460 } 461 ndm->ndm_host[sn_len] = ':'; 462 memcpy(ndm->ndm_host + sn_len + 1, pathname, path_len + 1); 463 464 /* success */ 465 goto out; 466 467 bad: 468 printf("nfs_boot: bootparam_getfile: bad reply\n"); 469 error = EBADRPC; 470 471 out: 472 m_freem(m); 473 return(0); 474 } 475
Indexes created Tue Sep 23 14:10:03 GMT 2025