nfs_boot.c revision 1.17
1 /* $NetBSD: nfs_boot.c,v 1.17 1995/05/20 01:52:52 mycroft Exp $ */ 2 3 /* 4 * Copyright (c) 1995 Adam Glass, Gordon Ross 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. The name of the authors may not be used to endorse or promote products 16 * derived from this software without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS OR 19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 21 * IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT, INDIRECT, 22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 23 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 28 */ 29 30 #include <sys/param.h> 31 #include <sys/systm.h> 32 #include <sys/kernel.h> 33 #include <sys/conf.h> 34 #include <sys/ioctl.h> 35 #include <sys/proc.h> 36 #include <sys/mount.h> 37 #include <sys/mbuf.h> 38 #include <sys/reboot.h> 39 #include <sys/socket.h> 40 #include <sys/socketvar.h> 41 42 #include <net/if.h> 43 #include <net/route.h> 44 45 #include <netinet/in.h> 46 #include <netinet/if_ether.h> 47 48 #include <nfs/rpcv2.h> 49 #include <nfs/nfsv2.h> 50 #include <nfs/nfs.h> 51 #include <nfs/nfsdiskless.h> 52 #include <nfs/krpc.h> 53 #include <nfs/xdr_subs.h> 54 55 #include "ether.h" 56 #if NETHER == 0 57 58 int nfs_boot_init(nd, procp) 59 struct nfs_diskless *nd; 60 struct proc *procp; 61 { 62 panic("nfs_boot_init: no ether"); 63 } 64 65 #else /* NETHER */ 66 67 /* 68 * Support for NFS diskless booting, specifically getting information 69 * about where to boot from, what pathnames, etc. 70 * 71 * This implememtation uses RARP and the bootparam RPC. 72 * We are forced to implement RPC anyway (to get file handles) 73 * so we might as well take advantage of it for bootparam too. 74 * 75 * The diskless boot sequence goes as follows: 76 * (1) Use RARP to get our interface address 77 * (2) Use RPC/bootparam/whoami to get our hostname, 78 * our IP address, and the server's IP address. 79 * (3) Use RPC/bootparam/getfile to get the root path 80 * (4) Use RPC/mountd to get the root file handle 81 * (5) Use RPC/bootparam/getfile to get the swap path 82 * (6) Use RPC/mountd to get the swap file handle 83 * 84 * (This happens to be the way Sun does it too.) 85 */ 86 87 /* bootparam RPC */ 88 static int bp_whoami __P((struct sockaddr_in *bpsin, 89 struct in_addr *my_ip, struct in_addr *gw_ip)); 90 static int bp_getfile __P((struct sockaddr_in *bpsin, char *key, 91 struct sockaddr_in *mdsin, char *servname, char *path)); 92 93 /* mountd RPC */ 94 static int md_mount __P((struct sockaddr_in *mdsin, char *path, 95 u_char *fh)); 96 97 /* other helpers */ 98 static void get_path_and_handle __P((struct sockaddr_in *bpsin, 99 char *key, struct nfs_dlmount *ndmntp)); 100 101 char *nfsbootdevname; 102 103 /* 104 * Called with an empty nfs_diskless struct to be filled in. 105 */ 106 int 107 nfs_boot_init(nd, procp) 108 struct nfs_diskless *nd; 109 struct proc *procp; 110 { 111 struct ifreq ireq; 112 struct in_addr my_ip, gw_ip; 113 struct sockaddr_in bp_sin; 114 struct sockaddr_in *sin; 115 struct ifnet *ifp; 116 struct socket *so; 117 int error; 118 119 /* 120 * Find an interface, rarp for its ip address, stuff it, the 121 * implied broadcast addr, and netmask into a nfs_diskless struct. 122 * 123 * This was moved here from nfs_vfsops.c because this procedure 124 * would be quite different if someone decides to write (i.e.) a 125 * BOOTP version of this file (might not use RARP, etc.) 126 */ 127 128 /* 129 * Find a network interface. 130 */ 131 if (nfsbootdevname) 132 ifp = ifunit(nfsbootdevname); 133 else 134 for (ifp = ifnet; ifp; ifp = ifp->if_next) 135 if ((ifp->if_flags & 136 (IFF_LOOPBACK|IFF_POINTOPOINT)) == 0) 137 break; 138 if (ifp == NULL) 139 panic("nfs_boot: no suitable interface"); 140 sprintf(ireq.ifr_name, "%s%d", ifp->if_name, ifp->if_unit); 141 printf("nfs_boot: using network interface '%s'\n", 142 ireq.ifr_name); 143 144 /* 145 * Bring up the interface. 146 */ 147 if ((error = socreate(AF_INET, &so, SOCK_DGRAM, 0)) != 0) 148 panic("nfs_boot: socreate, error=%d", error); 149 ireq.ifr_flags = IFF_UP; 150 error = ifioctl(so, SIOCSIFFLAGS, (caddr_t)&ireq, procp); 151 if (error) 152 panic("nfs_boot: SIFFLAGS, error=%d", error); 153 154 /* 155 * Do RARP for the interface address. 156 */ 157 if ((error = revarpwhoami(&my_ip, ifp)) != 0) 158 panic("revarp failed, error=%d", error); 159 printf("nfs_boot: client_addr=0x%x\n", ntohl(my_ip.s_addr)); 160 161 /* 162 * Do enough of ifconfig(8) so that the chosen interface 163 * can talk to the servers. (just set the address) 164 */ 165 sin = (struct sockaddr_in *)&ireq.ifr_addr; 166 bzero((caddr_t)sin, sizeof(*sin)); 167 sin->sin_len = sizeof(*sin); 168 sin->sin_family = AF_INET; 169 sin->sin_addr.s_addr = my_ip.s_addr; 170 error = ifioctl(so, SIOCSIFADDR, (caddr_t)&ireq, procp); 171 if (error) 172 panic("nfs_boot: set if addr, error=%d", error); 173 174 soclose(so); 175 176 /* 177 * Get client name and gateway address. 178 * RPC: bootparam/whoami 179 * Use the old broadcast address for the WHOAMI 180 * call because we do not yet know our netmask. 181 * The server address returned by the WHOAMI call 182 * is used for all subsequent booptaram RPCs. 183 */ 184 bzero((caddr_t)&bp_sin, sizeof(bp_sin)); 185 bp_sin.sin_len = sizeof(bp_sin); 186 bp_sin.sin_family = AF_INET; 187 bp_sin.sin_addr.s_addr = INADDR_BROADCAST; 188 hostnamelen = MAXHOSTNAMELEN; 189 190 /* this returns gateway IP address */ 191 error = bp_whoami(&bp_sin, &my_ip, &gw_ip); 192 if (error) 193 panic("nfs_boot: bootparam whoami, error=%d", error); 194 printf("nfs_boot: server_addr=0x%x\n", 195 ntohl(bp_sin.sin_addr.s_addr)); 196 printf("nfs_boot: hostname=%s\n", hostname); 197 198 #ifdef NFS_BOOT_GATEWAY 199 /* 200 * XXX - This code is conditionally compiled only because 201 * many bootparam servers (in particular, SunOS 4.1.3) 202 * always set the gateway address to their own address. 203 * The bootparam server is not necessarily the gateway. 204 * We could just believe the server, and at worst you would 205 * need to delete the incorrect default route before adding 206 * the correct one, but for simplicity, ignore the gateway. 207 * If your server is OK, you can turn on this option. 208 * 209 * If the gateway address is set, add a default route. 210 * (The mountd RPCs may go across a gateway.) 211 */ 212 if (gw_ip.s_addr) { 213 struct sockaddr dst, gw, mask; 214 /* Destination: (default) */ 215 bzero((caddr_t)&dst, sizeof(dst)); 216 dst.sa_len = sizeof(dst); 217 dst.sa_family = AF_INET; 218 /* Gateway: */ 219 bzero((caddr_t)&gw, sizeof(gw)); 220 sin = (struct sockaddr_in *)&gw; 221 sin->sin_len = sizeof(gw); 222 sin->sin_family = AF_INET; 223 sin->sin_addr.s_addr = gw_ip.s_addr; 224 /* Mask: (zero length) */ 225 bzero(&mask, sizeof(mask)); 226 227 printf("nfs_boot: gateway=0x%x\n", ntohl(gw_ip.s_addr)); 228 /* add, dest, gw, mask, flags, 0 */ 229 error = rtrequest(RTM_ADD, &dst, (struct sockaddr *)&gw, 230 &mask, (RTF_UP | RTF_GATEWAY | RTF_STATIC), NULL); 231 if (error) 232 printf("nfs_boot: add route, error=%d\n", error); 233 } 234 #endif 235 236 get_path_and_handle(&bp_sin, "root", &nd->nd_root); 237 get_path_and_handle(&bp_sin, "swap", &nd->nd_swap); 238 239 return (0); 240 } 241 242 static void 243 get_path_and_handle(bpsin, key, ndmntp) 244 struct sockaddr_in *bpsin; /* bootparam server */ 245 char *key; /* root or swap */ 246 struct nfs_dlmount *ndmntp; /* output */ 247 { 248 char pathname[MAXPATHLEN]; 249 char *sp, *dp, *endp; 250 int error; 251 252 /* 253 * Get server:pathname for "key" (root or swap) 254 * using RPC to bootparam/getfile 255 */ 256 error = bp_getfile(bpsin, key, &ndmntp->ndm_saddr, 257 ndmntp->ndm_host, pathname); 258 if (error) 259 panic("nfs_boot: bootparam get %s: %d", key, error); 260 261 /* 262 * Get file handle for "key" (root or swap) 263 * using RPC to mountd/mount 264 */ 265 error = md_mount(&ndmntp->ndm_saddr, pathname, ndmntp->ndm_fh); 266 if (error) 267 panic("nfs_boot: mountd %s, error=%d", key, error); 268 269 /* Construct remote path (for getmntinfo(3)) */ 270 dp = ndmntp->ndm_host; 271 endp = dp + MNAMELEN - 1; 272 dp += strlen(dp); 273 *dp++ = ':'; 274 for (sp = pathname; *sp && dp < endp;) 275 *dp++ = *sp++; 276 *dp = '\0'; 277 278 } 279 280 281 /* 282 * RPC: bootparam/whoami 283 * Given client IP address, get: 284 * client name (hostname) 285 * domain name (domainname) 286 * gateway address 287 * 288 * The hostname and domainname are set here for convenience. 289 * 290 * Note - bpsin is initialized to the broadcast address, 291 * and will be replaced with the bootparam server address 292 * after this call is complete. Have to use PMAP_PROC_CALL 293 * to make sure we get responses only from a servers that 294 * know about us (don't want to broadcast a getport call). 295 */ 296 static int 297 bp_whoami(bpsin, my_ip, gw_ip) 298 struct sockaddr_in *bpsin; 299 struct in_addr *my_ip; 300 struct in_addr *gw_ip; 301 { 302 /* RPC structures for PMAPPROC_CALLIT */ 303 struct whoami_call { 304 u_int32_t call_prog; 305 u_int32_t call_vers; 306 u_int32_t call_proc; 307 u_int32_t call_arglen; 308 } *call; 309 struct callit_reply { 310 u_int32_t port; 311 u_int32_t encap_len; 312 /* encapsulated data here */ 313 } *reply; 314 315 struct mbuf *m, *from; 316 struct sockaddr_in *sin; 317 int error, msg_len; 318 int16_t port; 319 320 /* 321 * Build request message for PMAPPROC_CALLIT. 322 */ 323 m = m_get(M_WAIT, MT_DATA); 324 call = mtod(m, struct whoami_call *); 325 m->m_len = sizeof(*call); 326 call->call_prog = txdr_unsigned(BOOTPARAM_PROG); 327 call->call_vers = txdr_unsigned(BOOTPARAM_VERS); 328 call->call_proc = txdr_unsigned(BOOTPARAM_WHOAMI); 329 330 /* 331 * append encapsulated data (client IP address) 332 */ 333 m->m_next = xdr_inaddr_encode(my_ip); 334 call->call_arglen = txdr_unsigned(m->m_next->m_len); 335 336 /* RPC: portmap/callit */ 337 bpsin->sin_port = htons(PMAPPORT); 338 from = NULL; 339 error = krpc_call(bpsin, PMAPPROG, PMAPVERS, 340 PMAPPROC_CALLIT, &m, &from); 341 if (error) 342 return error; 343 344 /* 345 * Parse result message. 346 */ 347 if (m->m_len < sizeof(*reply)) { 348 m = m_pullup(m, sizeof(*reply)); 349 if (m == NULL) 350 goto bad; 351 } 352 reply = mtod(m, struct callit_reply *); 353 port = fxdr_unsigned(u_int32_t, reply->port); 354 msg_len = fxdr_unsigned(u_int32_t, reply->encap_len); 355 m_adj(m, sizeof(*reply)); 356 357 /* 358 * Save bootparam server address 359 */ 360 sin = mtod(from, struct sockaddr_in *); 361 bpsin->sin_port = htons(port); 362 bpsin->sin_addr.s_addr = sin->sin_addr.s_addr; 363 364 /* client name */ 365 hostnamelen = MAXHOSTNAMELEN-1; 366 m = xdr_string_decode(m, hostname, &hostnamelen); 367 if (m == NULL) 368 goto bad; 369 370 /* domain name */ 371 domainnamelen = MAXHOSTNAMELEN-1; 372 m = xdr_string_decode(m, domainname, &domainnamelen); 373 if (m == NULL) 374 goto bad; 375 376 /* gateway address */ 377 m = xdr_inaddr_decode(m, gw_ip); 378 if (m == NULL) 379 goto bad; 380 381 /* success */ 382 goto out; 383 384 bad: 385 printf("nfs_boot: bootparam_whoami: bad reply\n"); 386 error = EBADRPC; 387 388 out: 389 if (from) 390 m_freem(from); 391 if (m) 392 m_freem(m); 393 return(error); 394 } 395 396 397 /* 398 * RPC: bootparam/getfile 399 * Given client name and file "key", get: 400 * server name 401 * server IP address 402 * server pathname 403 */ 404 static int 405 bp_getfile(bpsin, key, md_sin, serv_name, pathname) 406 struct sockaddr_in *bpsin; 407 char *key; 408 struct sockaddr_in *md_sin; 409 char *serv_name; 410 char *pathname; 411 { 412 struct mbuf *m; 413 struct sockaddr_in *sin; 414 struct in_addr inaddr; 415 int error, sn_len, path_len; 416 417 /* 418 * Build request message. 419 */ 420 421 /* client name (hostname) */ 422 m = xdr_string_encode(hostname, hostnamelen); 423 424 /* key name (root or swap) */ 425 m->m_next = xdr_string_encode(key, strlen(key)); 426 427 /* RPC: bootparam/getfile */ 428 error = krpc_call(bpsin, BOOTPARAM_PROG, BOOTPARAM_VERS, 429 BOOTPARAM_GETFILE, &m, NULL); 430 if (error) 431 return error; 432 433 /* 434 * Parse result message. 435 */ 436 437 /* server name */ 438 sn_len = MNAMELEN-1; 439 m = xdr_string_decode(m, serv_name, &sn_len); 440 if (m == NULL) 441 goto bad; 442 443 /* server IP address (mountd/NFS) */ 444 m = xdr_inaddr_decode(m, &inaddr); 445 if (m == NULL) 446 goto bad; 447 448 /* server pathname */ 449 path_len = MAXPATHLEN-1; 450 m = xdr_string_decode(m, pathname, &path_len); 451 if (m == NULL) 452 goto bad; 453 454 /* setup server socket address */ 455 sin = md_sin; 456 bzero((caddr_t)sin, sizeof(*sin)); 457 sin->sin_len = sizeof(*sin); 458 sin->sin_family = AF_INET; 459 sin->sin_addr = inaddr; 460 461 /* success */ 462 goto out; 463 464 bad: 465 printf("nfs_boot: bootparam_getfile: bad reply\n"); 466 error = EBADRPC; 467 468 out: 469 m_freem(m); 470 return(0); 471 } 472 473 474 /* 475 * RPC: mountd/mount 476 * Given a server pathname, get an NFS file handle. 477 * Also, sets sin->sin_port to the NFS service port. 478 */ 479 static int 480 md_mount(mdsin, path, fhp) 481 struct sockaddr_in *mdsin; /* mountd server address */ 482 char *path; 483 u_char *fhp; 484 { 485 /* The RPC structures */ 486 struct rdata { 487 u_int32_t errno; 488 u_char fh[NFS_FHSIZE]; 489 } *rdata; 490 struct mbuf *m; 491 int error; 492 493 /* Get port number for MOUNTD. */ 494 error = krpc_portmap(mdsin, RPCPROG_MNT, RPCMNT_VER1, 495 &mdsin->sin_port); 496 if (error) return error; 497 498 m = xdr_string_encode(path, strlen(path)); 499 500 /* Do RPC to mountd. */ 501 error = krpc_call(mdsin, RPCPROG_MNT, RPCMNT_VER1, 502 RPCMNT_MOUNT, &m, NULL); 503 if (error) 504 return error; /* message already freed */ 505 506 if (m->m_len < sizeof(*rdata)) { 507 m = m_pullup(m, sizeof(*rdata)); 508 if (m == NULL) 509 goto bad; 510 } 511 rdata = mtod(m, struct rdata *); 512 error = fxdr_unsigned(u_int32_t, rdata->errno); 513 if (error) 514 goto bad; 515 bcopy(rdata->fh, fhp, NFS_FHSIZE); 516 517 /* Set port number for NFS use. */ 518 error = krpc_portmap(mdsin, NFS_PROG, NFS_VER2, 519 &mdsin->sin_port); 520 goto out; 521 522 bad: 523 error = EBADRPC; 524 525 out: 526 m_freem(m); 527 return error; 528 } 529 530 #endif /* NETHER */ 531
Indexes created Tue Sep 30 20:09:53 GMT 2025