nfs_bootparam.c revision 1.33
1 /* $NetBSD: nfs_bootparam.c,v 1.33 2008/10/24 17:17:12 cegger 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 1.33 2008/10/24 17:17:12 cegger 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 (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) 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 #ifdef INET 130 #if NARP > 0 131 if (ifp->if_type == IFT_ETHER || ifp->if_type == IFT_FDDI) { 132 /* 133 * Do RARP for the interface address. 134 */ 135 error = revarpwhoarewe(ifp, &arps_ip, &my_ip); 136 } 137 #endif 138 #endif 139 if (error) { 140 printf("revarp failed, error=%d\n", error); 141 goto out; 142 } 143 144 nd->nd_myip.s_addr = my_ip.s_addr; 145 printf("nfs_boot: client_addr=%s", inet_ntoa(my_ip)); 146 printf(" (RARP from %s)\n", inet_ntoa(arps_ip)); 147 148 /* 149 * Do enough of ifconfig(8) so that the chosen interface 150 * can talk to the servers. (just set the address) 151 */ 152 error = nfs_boot_setaddress(ifp, lwp, my_ip.s_addr, 153 INADDR_ANY, INADDR_ANY); 154 if (error) { 155 printf("nfs_boot: set ifaddr, error=%d\n", error); 156 goto out; 157 } 158 159 /* 160 * Get client name and gateway address. 161 * RPC: bootparam/whoami 162 * Use the old broadcast address for the WHOAMI 163 * call because we do not yet know our netmask. 164 * The server address returned by the WHOAMI call 165 * is used for all subsequent booptaram RPCs. 166 */ 167 sin = &bp_sin; 168 memset((void *)sin, 0, sizeof(*sin)); 169 sin->sin_len = sizeof(*sin); 170 sin->sin_family = AF_INET; 171 sin->sin_addr.s_addr = INADDR_BROADCAST; 172 173 /* Do the RPC/bootparam/whoami. */ 174 error = bp_whoami(sin, &my_ip, &gw_ip, lwp); 175 if (error) { 176 printf("nfs_boot: bootparam whoami, error=%d\n", error); 177 goto delout; 178 } 179 printf("nfs_boot: server_addr=%s\n", inet_ntoa(sin->sin_addr)); 180 printf("nfs_boot: hostname=%s\n", hostname); 181 182 /* 183 * Now fetch the server:pathname strings and server IP 184 * for root and swap. Missing swap is not fatal. 185 */ 186 error = bp_getfile(sin, "root", &nd->nd_root, lwp); 187 if (error) { 188 printf("nfs_boot: bootparam get root: %d\n", error); 189 goto delout; 190 } 191 192 #ifndef NFS_BOOTPARAM_NOGATEWAY 193 gw_ndm = kmem_alloc(sizeof(*gw_ndm), KM_SLEEP); 194 memset((void *)gw_ndm, 0, sizeof(*gw_ndm)); 195 error = bp_getfile(sin, "gateway", gw_ndm, lwp); 196 if (error) { 197 /* No gateway supplied. No error, but try fallback. */ 198 error = 0; 199 goto nogwrepl; 200 } 201 sin = (struct sockaddr_in *) &gw_ndm->ndm_saddr; 202 if (sin->sin_addr.s_addr == 0) 203 goto out; /* no gateway */ 204 205 /* OK, we have a gateway! */ 206 printf("nfs_boot: gateway=%s\n", inet_ntoa(sin->sin_addr)); 207 /* Just save it. Caller adds the route. */ 208 nd->nd_gwip = sin->sin_addr; 209 210 /* Look for a mask string after the colon. */ 211 p = strchr(gw_ndm->ndm_host, ':'); 212 if (p == 0) 213 goto out; /* no netmask */ 214 /* have pathname */ 215 p++; /* skip ':' */ 216 mask = inet_addr(p); /* libkern */ 217 if (mask == 0) 218 goto out; /* no netmask */ 219 220 /* Have a netmask too! Save it; update the I/F. */ 221 nd->nd_mask.s_addr = mask; 222 printf("nfs_boot: my_mask=%s\n", inet_ntoa(nd->nd_mask)); 223 (void) nfs_boot_deladdress(ifp, lwp, my_ip.s_addr); 224 error = nfs_boot_setaddress(ifp, lwp, my_ip.s_addr, 225 mask, INADDR_ANY); 226 if (error) { 227 printf("nfs_boot: set ifmask, error=%d\n", error); 228 goto out; 229 } 230 goto gwok; 231 nogwrepl: 232 #endif 233 #ifdef NFS_BOOT_GATEWAY 234 /* 235 * Note: we normally ignore the gateway address returned 236 * by the "bootparam/whoami" RPC above, because many old 237 * bootparam servers supply a bogus gateway value. 238 * 239 * These deficiencies in the bootparam RPC interface are 240 * circumvented by using the bootparam/getfile RPC. The 241 * parameter "gateway" is requested, and if its returned, 242 * we use the "server" part of the reply as the gateway, 243 * and use the "pathname" part of the reply as the mask. 244 * (The mask comes to us as a string.) 245 */ 246 if (gw_ip.s_addr) { 247 /* Our caller will add the route. */ 248 nd->nd_gwip = gw_ip; 249 } 250 #endif 251 252 delout: 253 if (error) 254 (void) nfs_boot_deladdress(ifp, lwp, my_ip.s_addr); 255 out: 256 if (error) { 257 (void) nfs_boot_ifupdown(ifp, lwp, 0); 258 nfs_boot_flushrt(ifp); 259 } 260 #ifndef NFS_BOOTPARAM_NOGATEWAY 261 gwok: 262 if (gw_ndm) 263 kmem_free(gw_ndm, sizeof(*gw_ndm)); 264 #endif 265 return (error); 266 } 267 268 269 /* 270 * RPC: bootparam/whoami 271 * Given client IP address, get: 272 * client name (hostname) 273 * domain name (domainname) 274 * gateway address 275 * 276 * The hostname and domainname are set here for convenience. 277 * 278 * Note - bpsin is initialized to the broadcast address, 279 * and will be replaced with the bootparam server address 280 * after this call is complete. Have to use PMAP_PROC_CALL 281 * to make sure we get responses only from a servers that 282 * know about us (don't want to broadcast a getport call). 283 */ 284 static int 285 bp_whoami(struct sockaddr_in *bpsin, struct in_addr *my_ip, 286 struct in_addr *gw_ip, struct lwp *l) 287 { 288 /* RPC structures for PMAPPROC_CALLIT */ 289 struct whoami_call { 290 u_int32_t call_prog; 291 u_int32_t call_vers; 292 u_int32_t call_proc; 293 u_int32_t call_arglen; 294 } *call; 295 struct callit_reply { 296 u_int32_t port; 297 u_int32_t encap_len; 298 /* encapsulated data here */ 299 } *reply; 300 301 struct mbuf *m, *from; 302 struct sockaddr_in *sin; 303 int error; 304 int16_t port; 305 306 /* 307 * Build request message for PMAPPROC_CALLIT. 308 */ 309 m = m_get(M_WAIT, MT_DATA); 310 call = mtod(m, struct whoami_call *); 311 m->m_len = sizeof(*call); 312 call->call_prog = txdr_unsigned(BOOTPARAM_PROG); 313 call->call_vers = txdr_unsigned(BOOTPARAM_VERS); 314 call->call_proc = txdr_unsigned(BOOTPARAM_WHOAMI); 315 316 /* 317 * append encapsulated data (client IP address) 318 */ 319 m->m_next = xdr_inaddr_encode(my_ip); 320 call->call_arglen = txdr_unsigned(m->m_next->m_len); 321 322 /* RPC: portmap/callit */ 323 bpsin->sin_port = htons(PMAPPORT); 324 error = krpc_call(bpsin, PMAPPROG, PMAPVERS, 325 PMAPPROC_CALLIT, &m, &from, l); 326 if (error) { 327 m_freem(m); 328 return error; 329 } 330 331 /* 332 * Parse result message. 333 */ 334 if (m->m_len < sizeof(*reply)) { 335 m = m_pullup(m, sizeof(*reply)); 336 if (m == NULL) 337 goto bad; 338 } 339 reply = mtod(m, struct callit_reply *); 340 port = fxdr_unsigned(u_int32_t, reply->port); 341 m_adj(m, sizeof(*reply)); 342 343 /* 344 * Save bootparam server address 345 */ 346 sin = mtod(from, struct sockaddr_in *); 347 bpsin->sin_port = htons(port); 348 bpsin->sin_addr.s_addr = sin->sin_addr.s_addr; 349 350 /* client name */ 351 hostnamelen = MAXHOSTNAMELEN-1; 352 m = xdr_string_decode(m, hostname, &hostnamelen); 353 if (m == NULL) 354 goto bad; 355 356 /* domain name */ 357 domainnamelen = MAXHOSTNAMELEN-1; 358 m = xdr_string_decode(m, domainname, &domainnamelen); 359 if (m == NULL) 360 goto bad; 361 362 /* gateway address */ 363 m = xdr_inaddr_decode(m, gw_ip); 364 if (m == NULL) 365 goto bad; 366 367 /* success */ 368 goto out; 369 370 bad: 371 printf("nfs_boot: bootparam_whoami: bad reply\n"); 372 error = EBADRPC; 373 374 out: 375 m_freem(from); 376 if (m) 377 m_freem(m); 378 return(error); 379 } 380 381 382 /* 383 * RPC: bootparam/getfile 384 * Given client name and file "key", get: 385 * server name 386 * server IP address 387 * server pathname 388 */ 389 static int 390 bp_getfile(struct sockaddr_in *bpsin, const char *key, 391 struct nfs_dlmount *ndm, struct lwp *l) 392 { 393 char pathname[MNAMELEN]; 394 struct in_addr inaddr; 395 struct sockaddr_in *sin; 396 struct mbuf *m; 397 char *serv_name; 398 int error, sn_len, path_len; 399 400 /* 401 * Build request message. 402 */ 403 404 /* client name (hostname) */ 405 m = xdr_string_encode(hostname, hostnamelen); 406 if (m == NULL) 407 return (ENOMEM); 408 409 /* key name (root or swap) */ 410 /*XXXUNCONST*/ 411 m->m_next = xdr_string_encode(__UNCONST(key), strlen(key)); 412 if (m->m_next == NULL) 413 return (ENOMEM); 414 415 /* RPC: bootparam/getfile */ 416 error = krpc_call(bpsin, BOOTPARAM_PROG, BOOTPARAM_VERS, 417 BOOTPARAM_GETFILE, &m, NULL, l); 418 if (error) 419 return error; 420 421 /* 422 * Parse result message. 423 */ 424 425 /* server name */ 426 serv_name = &ndm->ndm_host[0]; 427 sn_len = sizeof(ndm->ndm_host) - 1; 428 m = xdr_string_decode(m, serv_name, &sn_len); 429 if (m == NULL) 430 goto bad; 431 432 /* server IP address (mountd/NFS) */ 433 m = xdr_inaddr_decode(m, &inaddr); 434 if (m == NULL) 435 goto bad; 436 437 /* server pathname */ 438 path_len = sizeof(pathname) - 1; 439 m = xdr_string_decode(m, pathname, &path_len); 440 if (m == NULL) 441 goto bad; 442 443 /* 444 * Store the results in the nfs_dlmount. 445 * The strings become "server:pathname" 446 */ 447 sin = (struct sockaddr_in *) &ndm->ndm_saddr; 448 memset((void *)sin, 0, sizeof(*sin)); 449 sin->sin_len = sizeof(*sin); 450 sin->sin_family = AF_INET; 451 sin->sin_addr = inaddr; 452 if ((sn_len + 1 + path_len + 1) > sizeof(ndm->ndm_host)) { 453 printf("nfs_boot: getfile name too long\n"); 454 error = EIO; 455 goto out; 456 } 457 ndm->ndm_host[sn_len] = ':'; 458 memcpy(ndm->ndm_host + sn_len + 1, pathname, path_len + 1); 459 460 /* success */ 461 goto out; 462 463 bad: 464 printf("nfs_boot: bootparam_getfile: bad reply\n"); 465 error = EBADRPC; 466 467 out: 468 m_freem(m); 469 return(0); 470 } 471
Indexes created Sun Sep 21 20:09:37 GMT 2025