subr_tftproot.c revision 1.1.8.2
1 /* $NetBSD: subr_tftproot.c,v 1.1.8.2 2007/07/11 20:10:07 mjf Exp $ */ 2 3 /*- 4 * Copyright (c) 2007 Emmanuel Dreyfus, all rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 3. All advertising materials mentioning features or use of this software 15 * must display the following acknowledgement: 16 * This product includes software developed by Emmanuel Dreyfus 17 * 4. The name of the author may not be used to endorse or promote 18 * products derived from this software without specific prior written 19 * permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE THE AUTHOR AND CONTRIBUTORS ``AS IS'' 22 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, 23 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 24 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS 25 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 26 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 27 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 28 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 29 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 30 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 31 * POSSIBILITY OF SUCH DAMAGE. 32 */ 33 34 /* 35 * Download the root RAMdisk through TFTP at root mount time 36 */ 37 38 #include "opt_tftproot.h" 39 #include "opt_md.h" 40 41 #include <sys/cdefs.h> 42 __KERNEL_RCSID(0, "$NetBSD: subr_tftproot.c,v 1.1.8.2 2007/07/11 20:10:07 mjf Exp $"); 43 44 #include <sys/param.h> 45 #include <sys/types.h> 46 #include <sys/mount.h> 47 #include <sys/lwp.h> 48 #include <sys/malloc.h> 49 #include <sys/mbuf.h> 50 #include <sys/timevar.h> 51 #include <sys/socketvar.h> 52 53 #include <net/if.h> 54 55 #include <dev/md.h> 56 57 #include <netinet/in.h> 58 59 #include <nfs/rpcv2.h> 60 61 #include <nfs/nfsproto.h> 62 #include <nfs/nfs.h> 63 #include <nfs/nfsmount.h> 64 #include <nfs/nfsdiskless.h> 65 #include <nfs/nfs_var.h> 66 67 extern void mdattach(int); 68 69 /* 70 * Copied from <lib/libsa/tftp.h> 71 */ 72 73 #define SEGSIZE 512 /* data segment size */ 74 75 /* 76 * Packet types. 77 */ 78 #define RRQ 01 /* read request */ 79 #define WRQ 02 /* write request */ 80 #define DATA 03 /* data packet */ 81 #define ACK 04 /* acknowledgement */ 82 #define ERROR 05 /* error code */ 83 84 struct tftphdr { 85 short th_opcode; /* packet type */ 86 union { 87 unsigned short tu_block; /* block # */ 88 short tu_code; /* error code */ 89 char tu_stuff[1]; /* request packet stuff */ 90 } th_u; 91 char th_data[1]; /* data or error string */ 92 } __packed; 93 94 #define th_block th_u.tu_block 95 #define th_code th_u.tu_code 96 #define th_stuff th_u.tu_stuff 97 #define th_msg th_data 98 99 #define IPPORT_TFTP 69 100 101 #ifdef TFTPROOT_DEBUG 102 #define DPRINTF(x) printf x 103 #else 104 #define DPRINTF(x) 105 #endif 106 107 struct tftproot_handle { 108 struct nfs_diskless *trh_nd; 109 void *trh_base; 110 size_t trh_len; 111 unsigned short trh_block; 112 int trh_flags; 113 }; 114 115 #define TRH_FINISHED 1 116 117 int tftproot_dhcpboot(struct device *); 118 119 static int tftproot_getfile(struct tftproot_handle *, struct lwp *); 120 static int tftproot_recv __P((struct mbuf*, void*)); 121 122 int 123 tftproot_dhcpboot(bootdv) 124 struct device *bootdv; 125 { 126 struct nfs_diskless *nd = NULL; 127 struct ifnet *ifp = NULL; 128 struct lwp *l; 129 struct tftproot_handle trh; 130 struct device *dv; 131 int error = -1; 132 133 if (rootspec != NULL) { 134 IFNET_FOREACH(ifp) 135 if (strcmp(rootspec, ifp->if_xname) == 0) 136 break; 137 } else if ((bootdv != NULL && device_class(bootdv) == DV_IFNET)) { 138 IFNET_FOREACH(ifp) 139 if (strcmp(bootdv->dv_xname, ifp->if_xname) == 0) 140 break; 141 } 142 143 if (ifp == NULL) { 144 DPRINTF(("%s():%d ifp is NULL\n", __func__, __LINE__)); 145 goto out; 146 } 147 148 for (dv = TAILQ_FIRST(&alldevs); dv != NULL; 149 dv = TAILQ_NEXT(dv, dv_list)) 150 if (strcmp(dv->dv_xname, ifp->if_xname) == 0) 151 break; 152 153 if ((dv == NULL) || (device_class(dv) != DV_IFNET)) { 154 DPRINTF(("%s():%d cannot find device for interface %s\n", 155 __func__, __LINE__, ifp->if_xname)); 156 goto out; 157 } 158 159 root_device = dv; 160 161 l = curlwp; /* XXX */ 162 163 nd = malloc(sizeof(*nd), M_NFSMNT, M_WAITOK); 164 bzero(nd, sizeof(nd)); 165 nd->nd_ifp = ifp; 166 nd->nd_nomount = 1; 167 168 if ((error = nfs_boot_init(nd, l)) != 0) { 169 DPRINTF(("%s():%d nfs_boot_init returned %d\n", 170 __func__, __LINE__, error)); 171 goto out; 172 } 173 174 /* 175 * Strip leading "tftp:" 176 */ 177 #define PREFIX "tftp:" 178 if (strstr(nd->nd_bootfile, PREFIX) == nd->nd_bootfile) 179 (void)memmove(nd->nd_bootfile, 180 nd->nd_bootfile + (sizeof(PREFIX) - 1), 181 sizeof(nd->nd_bootfile) - sizeof(PREFIX)); 182 #undef PREFIX 183 184 printf("tftproot: bootfile=%s\n", nd->nd_bootfile); 185 186 bzero(&trh, sizeof(trh)); 187 trh.trh_nd = nd; 188 trh.trh_block = 1; 189 190 if ((error = tftproot_getfile(&trh, l)) != 0) { 191 DPRINTF(("%s():%d tftproot_getfile returned %d\n", 192 __func__, __LINE__, error)); 193 goto out; 194 } 195 196 error = 0; 197 198 out: 199 if (nd) 200 free(nd, M_NFSMNT); 201 202 return error; 203 } 204 205 static int 206 tftproot_getfile(trh, l) 207 struct tftproot_handle *trh; 208 struct lwp *l; 209 { 210 struct socket *so = NULL; 211 struct mbuf *m_serv = NULL; 212 struct mbuf *m_outbuf = NULL; 213 struct sockaddr_in *sin; 214 struct tftphdr *tftp; 215 size_t packetlen, namelen; 216 int error = -1; 217 const char octetstr[] = "octet"; 218 size_t hdrlen = sizeof(*tftp) - sizeof(tftp->th_data); 219 char *cp; 220 /* struct device *dv; */ 221 222 if ((error = socreate(AF_INET, &so, SOCK_DGRAM, 0, l)) != 0) { 223 DPRINTF(("%s():%d socreate returned %d\n", 224 __func__, __LINE__, error)); 225 goto out; 226 } 227 228 /* 229 * Set timeout 230 */ 231 if ((error = nfs_boot_setrecvtimo(so))) { 232 DPRINTF(("%s():%d SO_RCVTIMEO failed %d\n", 233 __func__, __LINE__, error)); 234 goto out; 235 } 236 237 /* 238 * Set server address and port 239 */ 240 m_serv = m_get(M_WAIT, MT_SONAME); 241 m_serv->m_len = sizeof(*sin); 242 sin = mtod(m_serv, struct sockaddr_in *); 243 memcpy(sin, &trh->trh_nd->nd_root.ndm_saddr, sizeof(*sin)); 244 sin->sin_port = htons(IPPORT_TFTP); 245 246 /* 247 * Set send buffer, prepare the TFTP packet 248 */ 249 namelen = strlen(trh->trh_nd->nd_bootfile) + 1; 250 packetlen = sizeof(tftp->th_opcode) + namelen + sizeof(octetstr); 251 if (packetlen > MSIZE) { 252 DPRINTF(("%s():%d boot filename too long (%ld bytes)\n", 253 __func__, __LINE__, (long)namelen)); 254 goto out; 255 } 256 257 m_outbuf = m_gethdr(M_WAIT, MT_DATA); 258 m_clget(m_outbuf, M_WAIT); 259 m_outbuf->m_len = packetlen; 260 m_outbuf->m_pkthdr.len = packetlen; 261 m_outbuf->m_pkthdr.rcvif = NULL; 262 263 tftp = mtod(m_outbuf, struct tftphdr *); 264 memset(tftp, 0, packetlen); 265 266 tftp->th_opcode = htons((short)RRQ); 267 cp = tftp->th_stuff; 268 (void)strncpy(cp, trh->trh_nd->nd_bootfile, namelen); 269 cp += namelen; 270 (void)strncpy(cp, octetstr, sizeof(octetstr)); 271 272 /* 273 * Perform the file transfer 274 */ 275 sin = (struct sockaddr_in *)&trh->trh_nd->nd_root.ndm_saddr; 276 printf("tftproot: download %s:%s ", 277 inet_ntoa(sin->sin_addr), trh->trh_nd->nd_bootfile); 278 279 do { 280 /* 281 * Show progress for every 200 blocks (100kB) 282 */ 283 #ifndef TFTPROOT_PROGRESS 284 #define TFTPROOT_PROGRESS 200 285 #endif 286 if ((trh->trh_block % TFTPROOT_PROGRESS) == 0) 287 twiddle(); 288 289 /* 290 * Send the packet and receive the answer. 291 * We get the sender address here, which should be 292 * the same server with a different port 293 */ 294 if ((error = nfs_boot_sendrecv(so, m_serv, NULL, m_outbuf, 295 tftproot_recv, NULL, &m_serv, trh, l)) != 0) { 296 DPRINTF(("%s():%d sendrecv failed %d\n", 297 __func__, __LINE__, error)); 298 goto out; 299 } 300 301 /* 302 * Accomodate the packet length for acks. 303 * This is really needed only on first pass 304 */ 305 m_outbuf->m_len = hdrlen; 306 m_outbuf->m_pkthdr.len = hdrlen; 307 tftp->th_opcode = htons((short)ACK); 308 tftp->th_block = htons(trh->trh_block); 309 310 311 /* 312 * Check for termination 313 */ 314 if (trh->trh_flags & TRH_FINISHED) 315 break; 316 317 trh->trh_block++; 318 } while (1/* CONSTCOND */); 319 320 printf("\n"); 321 322 /* 323 * Ack the last block. so_send frees m_outbuf, therefore 324 * we do not want to free it ourselves. 325 * Ignore errors, as we already have the whole file. 326 */ 327 if ((error = (*so->so_send)(so, m_serv, NULL, 328 m_outbuf, NULL, 0, l)) != 0) 329 DPRINTF(("%s():%d tftproot: sosend returned %d\n", 330 __func__, __LINE__, error)); 331 else 332 m_outbuf = NULL; 333 334 /* 335 * And use it as the root ramdisk. 336 */ 337 DPRINTF(("%s():%d RAMdisk loaded: %ld@%p\n", 338 __func__, __LINE__, trh->trh_len, trh->trh_base)); 339 md_root_setconf(trh->trh_base, trh->trh_len); 340 mdattach(0); 341 342 error = 0; 343 out: 344 if (m_serv) 345 m_freem(m_serv); 346 347 if (m_outbuf) 348 m_freem(m_outbuf); 349 350 if (so) 351 soclose(so); 352 353 return error; 354 } 355 356 static int 357 tftproot_recv(m, ctx) 358 struct mbuf *m; 359 void *ctx; 360 { 361 struct tftproot_handle *trh = ctx; 362 struct tftphdr *tftp; 363 size_t newlen; 364 size_t hdrlen = sizeof(*tftp) - sizeof(tftp->th_data); 365 366 /* 367 * Check for short packet 368 */ 369 if (m->m_pkthdr.len < hdrlen) { 370 DPRINTF(("%s():%d short reply (%d bytes)\n", 371 __func__, __LINE__, m->m_pkthdr.len)); 372 return -1; 373 } 374 375 /* 376 * Check for packet too large for being a TFTP packet 377 */ 378 if (m->m_pkthdr.len > hdrlen + SEGSIZE) { 379 DPRINTF(("%s():%d packet too big (%d bytes)\n", 380 __func__, __LINE__, m->m_pkthdr.len)); 381 return -1; 382 } 383 384 385 /* 386 * Examine the TFTP header 387 */ 388 if (m->m_len > sizeof(*tftp)) { 389 if ((m = m_pullup(m, sizeof(*tftp))) == NULL) { 390 DPRINTF(("%s():%d m_pullup failed\n", 391 __func__, __LINE__)); 392 return -1; 393 } 394 } 395 tftp = mtod(m, struct tftphdr *); 396 397 /* 398 * We handle data or error 399 */ 400 switch(ntohs(tftp->th_opcode)) { 401 case DATA: 402 break; 403 404 case ERROR: { 405 char errbuf[SEGSIZE + 1]; 406 int i; 407 408 for (i = 0; i < SEGSIZE; i++) { 409 if ((tftp->th_data[i] < ' ') || 410 (tftp->th_data[i] > '~')) { 411 errbuf[i] = '\0'; 412 break; 413 } 414 errbuf[i] = tftp->th_data[i]; 415 } 416 errbuf[SEGSIZE] = '\0'; 417 418 printf("tftproot: TFTP server returned error %d, %s\n", 419 ntohs(tftp->th_code), errbuf); 420 421 return -1; 422 break; 423 } 424 425 default: 426 DPRINTF(("%s():%d unexpected tftp reply opcode %d\n", 427 __func__, __LINE__, ntohs(tftp->th_opcode))); 428 return -1; 429 break; 430 } 431 432 /* 433 * Check for last packet, which does not fill the whole space 434 */ 435 if (m->m_pkthdr.len < hdrlen + SEGSIZE) { 436 DPRINTF(("%s():%d last chunk (%d bytes)\n", 437 __func__, __LINE__, m->m_pkthdr.len)); 438 trh->trh_flags |= TRH_FINISHED; 439 } 440 441 442 if (ntohs(tftp->th_block) != trh->trh_block) { 443 DPRINTF(("%s():%d expected block %d, got block %d\n", 444 __func__, __LINE__, trh->trh_block, ntohs(tftp->th_block))); 445 return -1; 446 } 447 448 /* 449 * Grow the receiving buffer to accomodate new data 450 */ 451 newlen = trh->trh_len + (m->m_pkthdr.len - hdrlen); 452 if ((trh->trh_base = realloc(trh->trh_base, 453 newlen, M_TEMP, M_WAITOK)) == NULL) { 454 DPRINTF(("%s():%d failed to realloc %ld bytes\n", 455 __func__, __LINE__, (long)newlen)); 456 return -1; 457 } 458 459 /* 460 * Copy the data 461 */ 462 m_copydata(m, hdrlen, m->m_pkthdr.len - hdrlen, 463 (char *)trh->trh_base + trh->trh_len); 464 trh->trh_len = newlen; 465 466 return 0; 467 } 468 469
Indexes created Fri Sep 26 20:09:58 GMT 2025