nfs_bootparam.c revision 1.37.8.1
1 /* $NetBSD: nfs_bootparam.c,v 1.37.8.1 2014/05/22 11:41:11 yamt 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 1.37.8.1 2014/05/22 11:41:11 yamt 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 #include <sys/vnode.h> 55 56 #include <net/if.h> 57 #include <net/if_types.h> 58 #include <net/route.h> 59 #include <net/if_ether.h> 60 61 #include <netinet/in.h> 62 #include <netinet/if_inarp.h> 63 64 #include <nfs/rpcv2.h> 65 #include <nfs/krpc.h> 66 #include <nfs/xdr_subs.h> 67 68 #include <nfs/nfsproto.h> 69 #include <nfs/nfs.h> 70 #include <nfs/nfsmount.h> 71 #include <nfs/nfsdiskless.h> 72 #include <nfs/nfs_var.h> 73 74 /* 75 * There are two implementations of NFS diskless boot. 76 * This implementation uses Sun RPC/bootparams, and the 77 * the other uses BOOTP (RFC951 - see nfs_bootdhcp.c). 78 * 79 * The Sun-style boot sequence goes as follows: 80 * (1) Use RARP to get our interface address 81 * (2) Use RPC/bootparam/whoami to get our hostname, 82 * our IP address, and the server's IP address. 83 * (3) Use RPC/bootparam/getfile to get the root path 84 * (4) Use RPC/mountd to get the root file handle 85 * (5) Use RPC/bootparam/getfile to get the swap path 86 * (6) Use RPC/mountd to get the swap file handle 87 */ 88 89 /* bootparam RPC */ 90 static int bp_whoami (struct sockaddr_in *bpsin, 91 struct in_addr *my_ip, struct in_addr *gw_ip, struct lwp *l); 92 static int bp_getfile (struct sockaddr_in *bpsin, const char *key, 93 struct nfs_dlmount *ndm, struct lwp *l); 94 95 96 /* 97 * Get client name, gateway address, then 98 * get root and swap server:pathname info. 99 * RPCs: bootparam/whoami, bootparam/getfile 100 * 101 * Use the old broadcast address for the WHOAMI 102 * call because we do not yet know our netmask. 103 * The server address returned by the WHOAMI call 104 * is used for all subsequent bootparam RPCs. 105 */ 106 int 107 nfs_bootparam(struct nfs_diskless *nd, struct lwp *lwp, int *flags) 108 { 109 struct ifnet *ifp = nd->nd_ifp; 110 struct in_addr my_ip, arps_ip, gw_ip; 111 struct sockaddr_in bp_sin; 112 struct sockaddr_in *sin; 113 #ifndef NFS_BOOTPARAM_NOGATEWAY 114 struct nfs_dlmount *gw_ndm = 0; 115 char *p; 116 u_int32_t mask; 117 #endif 118 int error; 119 120 /* 121 * Bring up the interface. (just set the "up" flag) 122 */ 123 error = nfs_boot_ifupdown(ifp, lwp, 1); 124 if (error) { 125 printf("nfs_boot: SIFFLAGS, error=%d\n", error); 126 return (error); 127 } 128 129 error = EADDRNOTAVAIL; 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 if (error) { 139 printf("revarp failed, error=%d\n", error); 140 goto out; 141 } 142 143 if (!(*flags & NFS_BOOT_HAS_MYIP)) { 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 *flags |= NFS_BOOT_HAS_MYIP; 148 } 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 *flags |= NFS_BOOT_HAS_SERVADDR | NFS_BOOT_HAS_SERVER; 182 printf("nfs_boot: server_addr=%s\n", inet_ntoa(sin->sin_addr)); 183 printf("nfs_boot: hostname=%s\n", hostname); 184 185 /* 186 * Now fetch the server:pathname strings and server IP 187 * for root and swap. Missing swap is not fatal. 188 */ 189 error = bp_getfile(sin, "root", &nd->nd_root, lwp); 190 if (error) { 191 printf("nfs_boot: bootparam get root: %d\n", error); 192 goto delout; 193 } 194 *flags |= NFS_BOOT_HAS_ROOTPATH; 195 196 #ifndef NFS_BOOTPARAM_NOGATEWAY 197 gw_ndm = kmem_alloc(sizeof(*gw_ndm), KM_SLEEP); 198 memset((void *)gw_ndm, 0, sizeof(*gw_ndm)); 199 error = bp_getfile(sin, "gateway", gw_ndm, lwp); 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 *flags |= NFS_BOOT_HAS_GWIP; 214 215 /* Look for a mask string after the colon. */ 216 p = strchr(gw_ndm->ndm_host, ':'); 217 if (p == 0) 218 goto out; /* no netmask */ 219 /* have pathname */ 220 p++; /* skip ':' */ 221 mask = inet_addr(p); /* libkern */ 222 if (mask == 0) 223 goto out; /* no netmask */ 224 225 /* Have a netmask too! Save it; update the I/F. */ 226 nd->nd_mask.s_addr = mask; 227 *flags |= NFS_BOOT_HAS_MASK; 228 printf("nfs_boot: my_mask=%s\n", inet_ntoa(nd->nd_mask)); 229 (void) nfs_boot_deladdress(ifp, lwp, my_ip.s_addr); 230 error = nfs_boot_setaddress(ifp, lwp, my_ip.s_addr, 231 mask, INADDR_ANY); 232 if (error) { 233 printf("nfs_boot: set ifmask, error=%d\n", error); 234 goto out; 235 } 236 goto gwok; 237 nogwrepl: 238 #endif 239 #ifdef NFS_BOOT_GATEWAY 240 /* 241 * Note: we normally ignore the gateway address returned 242 * by the "bootparam/whoami" RPC above, because many old 243 * bootparam servers supply a bogus gateway value. 244 * 245 * These deficiencies in the bootparam RPC interface are 246 * circumvented by using the bootparam/getfile RPC. The 247 * parameter "gateway" is requested, and if its returned, 248 * we use the "server" part of the reply as the gateway, 249 * and use the "pathname" part of the reply as the mask. 250 * (The mask comes to us as a string.) 251 */ 252 if (gw_ip.s_addr) { 253 /* Our caller will add the route. */ 254 nd->nd_gwip = gw_ip; 255 *flags |= NFS_BOOT_HAS_GWIP; 256 } 257 #endif 258 259 delout: 260 if (error) 261 (void) nfs_boot_deladdress(ifp, lwp, my_ip.s_addr); 262 out: 263 if (error) { 264 (void) nfs_boot_ifupdown(ifp, lwp, 0); 265 nfs_boot_flushrt(ifp); 266 } 267 #ifndef NFS_BOOTPARAM_NOGATEWAY 268 gwok: 269 if (gw_ndm) 270 kmem_free(gw_ndm, sizeof(*gw_ndm)); 271 #endif 272 if ((*flags & NFS_BOOT_ALLINFO) != NFS_BOOT_ALLINFO) 273 return error ? error : EADDRNOTAVAIL; 274 275 return (error); 276 } 277 278 279 /* 280 * RPC: bootparam/whoami 281 * Given client IP address, get: 282 * client name (hostname) 283 * domain name (domainname) 284 * gateway address 285 * 286 * The hostname and domainname are set here for convenience. 287 * 288 * Note - bpsin is initialized to the broadcast address, 289 * and will be replaced with the bootparam server address 290 * after this call is complete. Have to use PMAP_PROC_CALL 291 * to make sure we get responses only from a servers that 292 * know about us (don't want to broadcast a getport call). 293 */ 294 static int 295 bp_whoami(struct sockaddr_in *bpsin, struct in_addr *my_ip, 296 struct in_addr *gw_ip, struct lwp *l) 297 { 298 /* RPC structures for PMAPPROC_CALLIT */ 299 struct whoami_call { 300 u_int32_t call_prog; 301 u_int32_t call_vers; 302 u_int32_t call_proc; 303 u_int32_t call_arglen; 304 } *call; 305 struct callit_reply { 306 u_int32_t port; 307 u_int32_t encap_len; 308 /* encapsulated data here */ 309 } *reply; 310 311 struct mbuf *m, *from; 312 struct sockaddr_in *sin; 313 int error; 314 int16_t port; 315 316 /* 317 * Build request message for PMAPPROC_CALLIT. 318 */ 319 m = m_get(M_WAIT, MT_DATA); 320 call = mtod(m, struct whoami_call *); 321 m->m_len = sizeof(*call); 322 call->call_prog = txdr_unsigned(BOOTPARAM_PROG); 323 call->call_vers = txdr_unsigned(BOOTPARAM_VERS); 324 call->call_proc = txdr_unsigned(BOOTPARAM_WHOAMI); 325 326 /* 327 * append encapsulated data (client IP address) 328 */ 329 m->m_next = xdr_inaddr_encode(my_ip); 330 call->call_arglen = txdr_unsigned(m->m_next->m_len); 331 332 /* RPC: portmap/callit */ 333 bpsin->sin_port = htons(PMAPPORT); 334 error = krpc_call(bpsin, PMAPPROG, PMAPVERS, 335 PMAPPROC_CALLIT, &m, &from, l); 336 if (error) { 337 m_freem(m); 338 return error; 339 } 340 341 /* 342 * Parse result message. 343 */ 344 if (m->m_len < sizeof(*reply)) { 345 m = m_pullup(m, sizeof(*reply)); 346 if (m == NULL) 347 goto bad; 348 } 349 reply = mtod(m, struct callit_reply *); 350 port = fxdr_unsigned(u_int32_t, reply->port); 351 m_adj(m, sizeof(*reply)); 352 353 /* 354 * Save bootparam server address 355 */ 356 sin = mtod(from, struct sockaddr_in *); 357 bpsin->sin_port = htons(port); 358 bpsin->sin_addr.s_addr = sin->sin_addr.s_addr; 359 360 /* client name */ 361 hostnamelen = MAXHOSTNAMELEN-1; 362 m = xdr_string_decode(m, hostname, &hostnamelen); 363 if (m == NULL) 364 goto bad; 365 366 /* domain name */ 367 domainnamelen = MAXHOSTNAMELEN-1; 368 m = xdr_string_decode(m, domainname, &domainnamelen); 369 if (m == NULL) 370 goto bad; 371 372 /* gateway address */ 373 m = xdr_inaddr_decode(m, gw_ip); 374 if (m == NULL) 375 goto bad; 376 377 /* success */ 378 goto out; 379 380 bad: 381 printf("nfs_boot: bootparam_whoami: bad reply\n"); 382 error = EBADRPC; 383 384 out: 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(struct sockaddr_in *bpsin, const char *key, 401 struct nfs_dlmount *ndm, struct lwp *l) 402 { 403 char pathname[MNAMELEN]; 404 struct in_addr inaddr; 405 struct sockaddr_in *sin; 406 struct mbuf *m; 407 char *serv_name; 408 int error, sn_len, path_len; 409 410 /* 411 * Build request message. 412 */ 413 414 /* client name (hostname) */ 415 m = xdr_string_encode(hostname, hostnamelen); 416 if (m == NULL) 417 return (ENOMEM); 418 419 /* key name (root or swap) */ 420 /*XXXUNCONST*/ 421 m->m_next = xdr_string_encode(__UNCONST(key), strlen(key)); 422 if (m->m_next == NULL) 423 return (ENOMEM); 424 425 /* RPC: bootparam/getfile */ 426 error = krpc_call(bpsin, BOOTPARAM_PROG, BOOTPARAM_VERS, 427 BOOTPARAM_GETFILE, &m, NULL, l); 428 if (error) 429 return error; 430 431 /* 432 * Parse result message. 433 */ 434 435 /* server name */ 436 serv_name = &ndm->ndm_host[0]; 437 sn_len = sizeof(ndm->ndm_host) - 1; 438 m = xdr_string_decode(m, serv_name, &sn_len); 439 if (m == NULL) 440 goto bad; 441 442 /* server IP address (mountd/NFS) */ 443 m = xdr_inaddr_decode(m, &inaddr); 444 if (m == NULL) 445 goto bad; 446 447 /* server pathname */ 448 path_len = sizeof(pathname) - 1; 449 m = xdr_string_decode(m, pathname, &path_len); 450 if (m == NULL) 451 goto bad; 452 453 /* 454 * Store the results in the nfs_dlmount. 455 * The strings become "server:pathname" 456 */ 457 sin = (struct sockaddr_in *) &ndm->ndm_saddr; 458 memset((void *)sin, 0, sizeof(*sin)); 459 sin->sin_len = sizeof(*sin); 460 sin->sin_family = AF_INET; 461 sin->sin_addr = inaddr; 462 if ((sn_len + 1 + path_len + 1) > sizeof(ndm->ndm_host)) { 463 printf("nfs_boot: getfile name too long\n"); 464 error = EIO; 465 goto out; 466 } 467 ndm->ndm_host[sn_len] = ':'; 468 memcpy(ndm->ndm_host + sn_len + 1, pathname, path_len + 1); 469 470 /* success */ 471 goto out; 472 473 bad: 474 printf("nfs_boot: bootparam_getfile: bad reply\n"); 475 error = EBADRPC; 476 477 out: 478 m_freem(m); 479 return(0); 480 } 481
Indexes created Tue Sep 30 10:09:55 GMT 2025