1 /* $NetBSD: nfs_bootparam.c,v 1.11 1999/02/21 15:07:49 drochner 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 45 #include <sys/param.h> 46 #include <sys/systm.h> 47 #include <sys/kernel.h> 48 #include <sys/conf.h> 49 #include <sys/device.h> 50 #include <sys/ioctl.h> 51 #include <sys/proc.h> 52 #include <sys/mount.h> 53 #include <sys/mbuf.h> 54 #include <sys/reboot.h> 55 #include <sys/socket.h> 56 #include <sys/socketvar.h> 57 58 #include <net/if.h> 59 #include <net/if_types.h> 60 #include <net/route.h> 61 #include <net/if_ether.h> 62 63 #include <netinet/in.h> 64 #include <netinet/if_inarp.h> 65 66 #include <nfs/rpcv2.h> 67 #include <nfs/krpc.h> 68 #include <nfs/xdr_subs.h> 69 70 #include <nfs/nfsproto.h> 71 #include <nfs/nfs.h> 72 #include <nfs/nfsmount.h> 73 #include <nfs/nfsdiskless.h> 74 75 #include "arp.h" 76 77 /* 78 * There are two implementations of NFS diskless boot. 79 * This implementation uses Sun RPC/bootparams, and the 80 * the other uses BOOTP (RFC951 - see nfs_bootdhcp.c). 81 * 82 * The Sun-style boot sequence goes as follows: 83 * (1) Use RARP to get our interface address 84 * (2) Use RPC/bootparam/whoami to get our hostname, 85 * our IP address, and the server's IP address. 86 * (3) Use RPC/bootparam/getfile to get the root path 87 * (4) Use RPC/mountd to get the root file handle 88 * (5) Use RPC/bootparam/getfile to get the swap path 89 * (6) Use RPC/mountd to get the swap file handle 90 */ 91 92 /* bootparam RPC */ 93 static int bp_whoami __P((struct sockaddr_in *bpsin, 94 struct in_addr *my_ip, struct in_addr *gw_ip)); 95 static int bp_getfile __P((struct sockaddr_in *bpsin, char *key, 96 struct nfs_dlmount *ndm)); 97 98 99 /* 100 * Get client name, gateway address, then 101 * get root and swap server:pathname info. 102 * RPCs: bootparam/whoami, bootparam/getfile 103 * 104 * Use the old broadcast address for the WHOAMI 105 * call because we do not yet know our netmask. 106 * The server address returned by the WHOAMI call 107 * is used for all subsequent booptaram RPCs. 108 */ 109 int 110 nfs_bootparam(nd, procp) 111 struct nfs_diskless *nd; 112 struct proc *procp; 113 { 114 struct ifnet *ifp = nd->nd_ifp; 115 struct in_addr my_ip, arps_ip, gw_ip; 116 struct sockaddr_in bp_sin; 117 struct sockaddr_in *sin; 118 #if 0 /* XXX - not yet */ 119 struct nfs_dlmount *gw_ndm = 0; 120 char *p; 121 u_int32_t mask; 122 #endif /* XXX */ 123 int error; 124 125 /* 126 * Bring up the interface. (just set the "up" flag) 127 */ 128 error = nfs_boot_ifupdown(ifp, procp, 1); 129 if (error) { 130 printf("nfs_boot: SIFFLAGS, error=%d\n", error); 131 return (error); 132 } 133 134 error = EADDRNOTAVAIL; /* ??? */ 135 #if NARP > 0 136 if (ifp->if_type == IFT_ETHER || ifp->if_type == IFT_FDDI) { 137 /* 138 * Do RARP for the interface address. 139 */ 140 error = revarpwhoarewe(ifp, &arps_ip, &my_ip); 141 if (error) { 142 printf("revarp failed, error=%d\n", error); 143 goto out; 144 } 145 } 146 #endif 147 148 nd->nd_myip.s_addr = my_ip.s_addr; 149 printf("nfs_boot: client_addr=0x%x (RARP from 0x%x)\n", 150 (u_int32_t)ntohl(my_ip.s_addr), 151 (u_int32_t)ntohl(arps_ip.s_addr)); 152 153 /* 154 * Do enough of ifconfig(8) so that the chosen interface 155 * can talk to the servers. (just set the address) 156 */ 157 error = nfs_boot_setaddress(ifp, procp, my_ip.s_addr, 158 INADDR_ANY, INADDR_ANY); 159 if (error) { 160 printf("nfs_boot: set ifaddr, error=%d\n", error); 161 goto out; 162 } 163 164 /* 165 * Get client name and gateway address. 166 * RPC: bootparam/whoami 167 * Use the old broadcast address for the WHOAMI 168 * call because we do not yet know our netmask. 169 * The server address returned by the WHOAMI call 170 * is used for all subsequent booptaram RPCs. 171 */ 172 sin = &bp_sin; 173 memset((caddr_t)sin, 0, sizeof(*sin)); 174 sin->sin_len = sizeof(*sin); 175 sin->sin_family = AF_INET; 176 sin->sin_addr.s_addr = INADDR_BROADCAST; 177 178 /* Do the RPC/bootparam/whoami. */ 179 error = bp_whoami(sin, &my_ip, &gw_ip); 180 if (error) { 181 printf("nfs_boot: bootparam whoami, error=%d\n", error); 182 goto delout; 183 } 184 printf("nfs_boot: server_addr=0x%x\n", 185 (u_int32_t)ntohl(sin->sin_addr.s_addr)); 186 printf("nfs_boot: hostname=%s\n", hostname); 187 188 /* 189 * Now fetch the server:pathname strings and server IP 190 * for root and swap. Missing swap is not fatal. 191 */ 192 error = bp_getfile(sin, "root", &nd->nd_root); 193 if (error) { 194 printf("nfs_boot: bootparam get root: %d\n", error); 195 goto delout; 196 } 197 198 #ifdef NFS_BOOT_GATEWAY 199 /* 200 * Note: we normally ignore the gateway address returned 201 * by the "bootparam/whoami" RPC above, because many old 202 * bootparam servers supply a bogus gateway value. 203 * 204 * These deficiencies in the bootparam RPC interface are 205 * circumvented by using the bootparam/getfile RPC. The 206 * parameter "gateway" is requested, and if its returned, 207 * we use the "server" part of the reply as the gateway, 208 * and use the "pathname" part of the reply as the mask. 209 * (The mask comes to us as a string.) 210 */ 211 if (gw_ip.s_addr) { 212 /* Our caller will add the route. */ 213 nd->nd_gwip = gw_ip; 214 } 215 #endif 216 #if 0 /* XXX - not yet */ 217 gw_ndm = malloc(sizeof(*gw_ndm), M_NFSMNT, M_WAITOK); 218 memset((caddr_t)gw_ndm, 0, sizeof(*gw_ndm)); 219 error = bp_getfile(sin, "gateway", gw_ndm); 220 if (error) { 221 /* Ignore the error. No gateway supplied. */ 222 error = 0; 223 goto out; 224 } 225 printf("nfs_boot: gateway=%s\n", gw_ndm->ndm_host); 226 sin = (struct sockaddr_in *) &gw_ndm->ndm_saddr; 227 nd->nd_gwip = sin->sin_addr; 228 /* Find the pathname part of the "mounted-on" string. */ 229 p = strchr(gw_ndm->ndm_host, ':'); 230 if (p == 0) 231 goto out; 232 /* have pathname */ 233 p++; /* skip ':' */ 234 mask = inet_addr(p); /* libkern */ 235 if (mask == 0) { 236 printf("nfs_boot: gateway netmask missing\n"); 237 goto out; 238 } 239 240 /* Save our netmask and update the network interface. */ 241 nd->nd_mask.s_addr = mask; 242 sin = (struct sockaddr_in *)&ireq.ifr_addr; 243 sin->sin_len = sizeof(*sin); 244 sin->sin_family = AF_INET; 245 sin->sin_addr = nd->nd_mask; 246 error = ifioctl(so, SIOCSIFNETMASK, (caddr_t)&ireq, procp); 247 if (error) { 248 printf("nfs_boot: set ifmask, error=%d\n", error); 249 error = 0; /* ignore it */ 250 } 251 if (gw_ndm) 252 free(gw_ndm, M_NFSMNT); 253 #endif /* XXX */ 254 255 delout: 256 if (error) 257 (void) nfs_boot_deladdress(ifp, procp, my_ip.s_addr); 258 out: 259 if (error) { 260 (void) nfs_boot_ifupdown(ifp, procp, 0); 261 nfs_boot_flushrt(ifp); 262 } 263 return (error); 264 } 265 266 267 /* 268 * RPC: bootparam/whoami 269 * Given client IP address, get: 270 * client name (hostname) 271 * domain name (domainname) 272 * gateway address 273 * 274 * The hostname and domainname are set here for convenience. 275 * 276 * Note - bpsin is initialized to the broadcast address, 277 * and will be replaced with the bootparam server address 278 * after this call is complete. Have to use PMAP_PROC_CALL 279 * to make sure we get responses only from a servers that 280 * know about us (don't want to broadcast a getport call). 281 */ 282 static int 283 bp_whoami(bpsin, my_ip, gw_ip) 284 struct sockaddr_in *bpsin; 285 struct in_addr *my_ip; 286 struct in_addr *gw_ip; 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, msg_len; 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 from = NULL; 325 error = krpc_call(bpsin, PMAPPROG, PMAPVERS, 326 PMAPPROC_CALLIT, &m, &from); 327 if (error) 328 return error; 329 330 /* 331 * Parse result message. 332 */ 333 if (m->m_len < sizeof(*reply)) { 334 m = m_pullup(m, sizeof(*reply)); 335 if (m == NULL) 336 goto bad; 337 } 338 reply = mtod(m, struct callit_reply *); 339 port = fxdr_unsigned(u_int32_t, reply->port); 340 msg_len = fxdr_unsigned(u_int32_t, reply->encap_len); 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 if (from) 376 m_freem(from); 377 if (m) 378 m_freem(m); 379 return(error); 380 } 381 382 383 /* 384 * RPC: bootparam/getfile 385 * Given client name and file "key", get: 386 * server name 387 * server IP address 388 * server pathname 389 */ 390 static int 391 bp_getfile(bpsin, key, ndm) 392 struct sockaddr_in *bpsin; 393 char *key; 394 struct nfs_dlmount *ndm; 395 { 396 char pathname[MNAMELEN]; 397 struct in_addr inaddr; 398 struct sockaddr_in *sin; 399 struct mbuf *m; 400 char *serv_name; 401 int error, sn_len, path_len; 402 403 /* 404 * Build request message. 405 */ 406 407 /* client name (hostname) */ 408 m = xdr_string_encode(hostname, hostnamelen); 409 if (m == NULL) 410 return (ENOMEM); 411 412 /* key name (root or swap) */ 413 m->m_next = xdr_string_encode(key, strlen(key)); 414 if (m->m_next == NULL) 415 return (ENOMEM); 416 417 /* RPC: bootparam/getfile */ 418 error = krpc_call(bpsin, BOOTPARAM_PROG, BOOTPARAM_VERS, 419 BOOTPARAM_GETFILE, &m, NULL); 420 if (error) 421 return error; 422 423 /* 424 * Parse result message. 425 */ 426 427 /* server name */ 428 serv_name = &ndm->ndm_host[0]; 429 sn_len = sizeof(ndm->ndm_host) - 1; 430 m = xdr_string_decode(m, serv_name, &sn_len); 431 if (m == NULL) 432 goto bad; 433 434 /* server IP address (mountd/NFS) */ 435 m = xdr_inaddr_decode(m, &inaddr); 436 if (m == NULL) 437 goto bad; 438 439 /* server pathname */ 440 path_len = sizeof(pathname) - 1; 441 m = xdr_string_decode(m, pathname, &path_len); 442 if (m == NULL) 443 goto bad; 444 445 /* 446 * Store the results in the nfs_dlmount. 447 * The strings become "server:pathname" 448 */ 449 sin = (struct sockaddr_in *) &ndm->ndm_saddr; 450 memset((caddr_t)sin, 0, sizeof(*sin)); 451 sin->sin_len = sizeof(*sin); 452 sin->sin_family = AF_INET; 453 sin->sin_addr = inaddr; 454 if ((sn_len + 1 + path_len + 1) > sizeof(ndm->ndm_host)) { 455 printf("nfs_boot: getfile name too long\n"); 456 error = EIO; 457 goto out; 458 } 459 ndm->ndm_host[sn_len] = ':'; 460 memcpy(ndm->ndm_host + sn_len + 1, pathname, path_len + 1); 461 462 /* success */ 463 goto out; 464 465 bad: 466 printf("nfs_boot: bootparam_getfile: bad reply\n"); 467 error = EBADRPC; 468 469 out: 470 m_freem(m); 471 return(0); 472 } 473 474 475