subr_tftproot.c revision 1.5
1 /* $NetBSD: subr_tftproot.c,v 1.5 2008/04/24 11:38:36 ad 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 1.5 2008/04/24 11:38:36 ad 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/kmem.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(device_xname(bootdv), 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 dv = device_find_by_xname(ifp->if_xname); 149 150 if ((dv == NULL) || (device_class(dv) != DV_IFNET)) { 151 DPRINTF(("%s():%d cannot find device for interface %s\n", 152 __func__, __LINE__, ifp->if_xname)); 153 goto out; 154 } 155 156 root_device = dv; 157 158 l = curlwp; /* XXX */ 159 160 nd = kmem_zalloc(sizeof(*nd), KM_SLEEP); 161 nd->nd_ifp = ifp; 162 nd->nd_nomount = 1; 163 164 if ((error = nfs_boot_init(nd, l)) != 0) { 165 DPRINTF(("%s():%d nfs_boot_init returned %d\n", 166 __func__, __LINE__, error)); 167 goto out; 168 } 169 170 /* 171 * Strip leading "tftp:" 172 */ 173 #define PREFIX "tftp:" 174 if (strstr(nd->nd_bootfile, PREFIX) == nd->nd_bootfile) 175 (void)memmove(nd->nd_bootfile, 176 nd->nd_bootfile + (sizeof(PREFIX) - 1), 177 sizeof(nd->nd_bootfile) - sizeof(PREFIX)); 178 #undef PREFIX 179 180 printf("tftproot: bootfile=%s\n", nd->nd_bootfile); 181 182 bzero(&trh, sizeof(trh)); 183 trh.trh_nd = nd; 184 trh.trh_block = 1; 185 186 if ((error = tftproot_getfile(&trh, l)) != 0) { 187 DPRINTF(("%s():%d tftproot_getfile returned %d\n", 188 __func__, __LINE__, error)); 189 goto out; 190 } 191 192 error = 0; 193 194 out: 195 if (nd) 196 kmem_free(nd, sizeof(*nd)); 197 198 return error; 199 } 200 201 static int 202 tftproot_getfile(trh, l) 203 struct tftproot_handle *trh; 204 struct lwp *l; 205 { 206 struct socket *so = NULL; 207 struct mbuf *m_serv = NULL; 208 struct mbuf *m_outbuf = NULL; 209 struct sockaddr_in *sin; 210 struct tftphdr *tftp; 211 size_t packetlen, namelen; 212 int error = -1; 213 const char octetstr[] = "octet"; 214 size_t hdrlen = sizeof(*tftp) - sizeof(tftp->th_data); 215 char *cp; 216 /* struct device *dv; */ 217 218 if ((error = socreate(AF_INET, &so, SOCK_DGRAM, 0, l, NULL)) != 0) { 219 DPRINTF(("%s():%d socreate returned %d\n", 220 __func__, __LINE__, error)); 221 goto out; 222 } 223 224 /* 225 * Set timeout 226 */ 227 if ((error = nfs_boot_setrecvtimo(so))) { 228 DPRINTF(("%s():%d SO_RCVTIMEO failed %d\n", 229 __func__, __LINE__, error)); 230 goto out; 231 } 232 233 /* 234 * Set server address and port 235 */ 236 m_serv = m_get(M_WAIT, MT_SONAME); 237 m_serv->m_len = sizeof(*sin); 238 sin = mtod(m_serv, struct sockaddr_in *); 239 memcpy(sin, &trh->trh_nd->nd_root.ndm_saddr, sizeof(*sin)); 240 sin->sin_port = htons(IPPORT_TFTP); 241 242 /* 243 * Set send buffer, prepare the TFTP packet 244 */ 245 namelen = strlen(trh->trh_nd->nd_bootfile) + 1; 246 packetlen = sizeof(tftp->th_opcode) + namelen + sizeof(octetstr); 247 if (packetlen > MSIZE) { 248 DPRINTF(("%s():%d boot filename too long (%ld bytes)\n", 249 __func__, __LINE__, (long)namelen)); 250 goto out; 251 } 252 253 m_outbuf = m_gethdr(M_WAIT, MT_DATA); 254 m_clget(m_outbuf, M_WAIT); 255 m_outbuf->m_len = packetlen; 256 m_outbuf->m_pkthdr.len = packetlen; 257 m_outbuf->m_pkthdr.rcvif = NULL; 258 259 tftp = mtod(m_outbuf, struct tftphdr *); 260 memset(tftp, 0, packetlen); 261 262 tftp->th_opcode = htons((short)RRQ); 263 cp = tftp->th_stuff; 264 (void)strncpy(cp, trh->trh_nd->nd_bootfile, namelen); 265 cp += namelen; 266 (void)strncpy(cp, octetstr, sizeof(octetstr)); 267 268 /* 269 * Perform the file transfer 270 */ 271 sin = (struct sockaddr_in *)&trh->trh_nd->nd_root.ndm_saddr; 272 printf("tftproot: download %s:%s ", 273 inet_ntoa(sin->sin_addr), trh->trh_nd->nd_bootfile); 274 275 do { 276 /* 277 * Show progress for every 200 blocks (100kB) 278 */ 279 #ifndef TFTPROOT_PROGRESS 280 #define TFTPROOT_PROGRESS 200 281 #endif 282 if ((trh->trh_block % TFTPROOT_PROGRESS) == 0) 283 twiddle(); 284 285 /* 286 * Send the packet and receive the answer. 287 * We get the sender address here, which should be 288 * the same server with a different port 289 */ 290 if ((error = nfs_boot_sendrecv(so, m_serv, NULL, m_outbuf, 291 tftproot_recv, NULL, &m_serv, trh, l)) != 0) { 292 DPRINTF(("%s():%d sendrecv failed %d\n", 293 __func__, __LINE__, error)); 294 goto out; 295 } 296 297 /* 298 * Accomodate the packet length for acks. 299 * This is really needed only on first pass 300 */ 301 m_outbuf->m_len = hdrlen; 302 m_outbuf->m_pkthdr.len = hdrlen; 303 tftp->th_opcode = htons((short)ACK); 304 tftp->th_block = htons(trh->trh_block); 305 306 307 /* 308 * Check for termination 309 */ 310 if (trh->trh_flags & TRH_FINISHED) 311 break; 312 313 trh->trh_block++; 314 } while (1/* CONSTCOND */); 315 316 printf("\n"); 317 318 /* 319 * Ack the last block. so_send frees m_outbuf, therefore 320 * we do not want to free it ourselves. 321 * Ignore errors, as we already have the whole file. 322 */ 323 if ((error = (*so->so_send)(so, m_serv, NULL, 324 m_outbuf, NULL, 0, l)) != 0) 325 DPRINTF(("%s():%d tftproot: sosend returned %d\n", 326 __func__, __LINE__, error)); 327 else 328 m_outbuf = NULL; 329 330 /* 331 * And use it as the root ramdisk. 332 */ 333 DPRINTF(("%s():%d RAMdisk loaded: %ld@%p\n", 334 __func__, __LINE__, trh->trh_len, trh->trh_base)); 335 md_root_setconf(trh->trh_base, trh->trh_len); 336 mdattach(0); 337 338 error = 0; 339 out: 340 if (m_serv) 341 m_freem(m_serv); 342 343 if (m_outbuf) 344 m_freem(m_outbuf); 345 346 if (so) 347 soclose(so); 348 349 return error; 350 } 351 352 static int 353 tftproot_recv(m, ctx) 354 struct mbuf *m; 355 void *ctx; 356 { 357 struct tftproot_handle *trh = ctx; 358 struct tftphdr *tftp; 359 size_t newlen; 360 size_t hdrlen = sizeof(*tftp) - sizeof(tftp->th_data); 361 362 /* 363 * Check for short packet 364 */ 365 if (m->m_pkthdr.len < hdrlen) { 366 DPRINTF(("%s():%d short reply (%d bytes)\n", 367 __func__, __LINE__, m->m_pkthdr.len)); 368 return -1; 369 } 370 371 /* 372 * Check for packet too large for being a TFTP packet 373 */ 374 if (m->m_pkthdr.len > hdrlen + SEGSIZE) { 375 DPRINTF(("%s():%d packet too big (%d bytes)\n", 376 __func__, __LINE__, m->m_pkthdr.len)); 377 return -1; 378 } 379 380 381 /* 382 * Examine the TFTP header 383 */ 384 if (m->m_len > sizeof(*tftp)) { 385 if ((m = m_pullup(m, sizeof(*tftp))) == NULL) { 386 DPRINTF(("%s():%d m_pullup failed\n", 387 __func__, __LINE__)); 388 return -1; 389 } 390 } 391 tftp = mtod(m, struct tftphdr *); 392 393 /* 394 * We handle data or error 395 */ 396 switch(ntohs(tftp->th_opcode)) { 397 case DATA: 398 break; 399 400 case ERROR: { 401 char errbuf[SEGSIZE + 1]; 402 int i; 403 404 for (i = 0; i < SEGSIZE; i++) { 405 if ((tftp->th_data[i] < ' ') || 406 (tftp->th_data[i] > '~')) { 407 errbuf[i] = '\0'; 408 break; 409 } 410 errbuf[i] = tftp->th_data[i]; 411 } 412 errbuf[SEGSIZE] = '\0'; 413 414 printf("tftproot: TFTP server returned error %d, %s\n", 415 ntohs(tftp->th_code), errbuf); 416 417 return -1; 418 break; 419 } 420 421 default: 422 DPRINTF(("%s():%d unexpected tftp reply opcode %d\n", 423 __func__, __LINE__, ntohs(tftp->th_opcode))); 424 return -1; 425 break; 426 } 427 428 /* 429 * Check for last packet, which does not fill the whole space 430 */ 431 if (m->m_pkthdr.len < hdrlen + SEGSIZE) { 432 DPRINTF(("%s():%d last chunk (%d bytes)\n", 433 __func__, __LINE__, m->m_pkthdr.len)); 434 trh->trh_flags |= TRH_FINISHED; 435 } 436 437 438 if (ntohs(tftp->th_block) != trh->trh_block) { 439 DPRINTF(("%s():%d expected block %d, got block %d\n", 440 __func__, __LINE__, trh->trh_block, ntohs(tftp->th_block))); 441 return -1; 442 } 443 444 /* 445 * Grow the receiving buffer to accomodate new data 446 */ 447 newlen = trh->trh_len + (m->m_pkthdr.len - hdrlen); 448 if ((trh->trh_base = realloc(trh->trh_base, 449 newlen, M_TEMP, M_WAITOK)) == NULL) { 450 DPRINTF(("%s():%d failed to realloc %ld bytes\n", 451 __func__, __LINE__, (long)newlen)); 452 return -1; 453 } 454 455 /* 456 * Copy the data 457 */ 458 m_copydata(m, hdrlen, m->m_pkthdr.len - hdrlen, 459 (char *)trh->trh_base + trh->trh_len); 460 trh->trh_len = newlen; 461 462 return 0; 463 } 464 465
Indexes created Wed Sep 24 05:09:52 GMT 2025