subr_tftproot.c revision 1.11
1 /* $NetBSD: subr_tftproot.c,v 1.11 2012/10/27 17:18:39 chs 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 1.11 2012/10/27 17:18:39 chs 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(device_t); 118 119 static int tftproot_getfile(struct tftproot_handle *, struct lwp *); 120 static int tftproot_recv(struct mbuf *, void *); 121 122 int 123 tftproot_dhcpboot(device_t bootdv) 124 { 125 struct nfs_diskless *nd = NULL; 126 struct ifnet *ifp = NULL; 127 struct lwp *l; 128 struct tftproot_handle trh; 129 device_t dv; 130 int error = -1; 131 132 if (rootspec != NULL) { 133 IFNET_FOREACH(ifp) 134 if (strcmp(rootspec, ifp->if_xname) == 0) 135 break; 136 } 137 138 if ((ifp == NULL) && 139 (bootdv != NULL && device_class(bootdv) == DV_IFNET)) { 140 IFNET_FOREACH(ifp) 141 if (strcmp(device_xname(bootdv), ifp->if_xname) == 0) 142 break; 143 } 144 145 if (ifp == NULL) { 146 DPRINTF(("%s():%d ifp is NULL\n", __func__, __LINE__)); 147 goto out; 148 } 149 150 dv = device_find_by_xname(ifp->if_xname); 151 152 if ((dv == NULL) || (device_class(dv) != DV_IFNET)) { 153 DPRINTF(("%s():%d cannot find device for interface %s\n", 154 __func__, __LINE__, ifp->if_xname)); 155 goto out; 156 } 157 158 root_device = dv; 159 160 l = curlwp; /* XXX */ 161 162 nd = kmem_zalloc(sizeof(*nd), KM_SLEEP); 163 nd->nd_ifp = ifp; 164 nd->nd_nomount = 1; 165 166 if ((error = nfs_boot_init(nd, l)) != 0) { 167 DPRINTF(("%s():%d nfs_boot_init returned %d\n", 168 __func__, __LINE__, error)); 169 goto out; 170 } 171 172 /* 173 * Strip leading "tftp:" 174 */ 175 #define PREFIX "tftp:" 176 if (strstr(nd->nd_bootfile, PREFIX) == nd->nd_bootfile) 177 (void)memmove(nd->nd_bootfile, 178 nd->nd_bootfile + (sizeof(PREFIX) - 1), 179 sizeof(nd->nd_bootfile) - sizeof(PREFIX)); 180 #undef PREFIX 181 182 printf("tftproot: bootfile=%s\n", nd->nd_bootfile); 183 184 memset(&trh, 0, sizeof(trh)); 185 trh.trh_nd = nd; 186 trh.trh_block = 1; 187 188 if ((error = tftproot_getfile(&trh, l)) != 0) { 189 DPRINTF(("%s():%d tftproot_getfile returned %d\n", 190 __func__, __LINE__, error)); 191 goto out; 192 } 193 194 error = 0; 195 196 out: 197 if (nd) 198 kmem_free(nd, sizeof(*nd)); 199 200 return error; 201 } 202 203 static int 204 tftproot_getfile(struct tftproot_handle *trh, 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; 216 217 if ((error = socreate(AF_INET, &so, SOCK_DGRAM, 0, l, NULL)) != 0) { 218 DPRINTF(("%s():%d socreate returned %d\n", 219 __func__, __LINE__, error)); 220 goto out; 221 } 222 223 /* 224 * Set timeout 225 */ 226 if ((error = nfs_boot_setrecvtimo(so))) { 227 DPRINTF(("%s():%d SO_RCVTIMEO failed %d\n", 228 __func__, __LINE__, error)); 229 goto out; 230 } 231 232 /* 233 * Set server address and port 234 */ 235 m_serv = m_get(M_WAIT, MT_SONAME); 236 m_serv->m_len = sizeof(*sin); 237 sin = mtod(m_serv, struct sockaddr_in *); 238 memcpy(sin, &trh->trh_nd->nd_root.ndm_saddr, sizeof(*sin)); 239 sin->sin_port = htons(IPPORT_TFTP); 240 241 /* 242 * Set send buffer, prepare the TFTP packet 243 */ 244 namelen = strlen(trh->trh_nd->nd_bootfile) + 1; 245 packetlen = sizeof(tftp->th_opcode) + namelen + sizeof(octetstr); 246 if (packetlen > MSIZE) { 247 DPRINTF(("%s():%d boot filename too long (%ld bytes)\n", 248 __func__, __LINE__, (long)namelen)); 249 goto out; 250 } 251 252 m_outbuf = m_gethdr(M_WAIT, MT_DATA); 253 m_clget(m_outbuf, M_WAIT); 254 m_outbuf->m_len = packetlen; 255 m_outbuf->m_pkthdr.len = packetlen; 256 m_outbuf->m_pkthdr.rcvif = NULL; 257 258 tftp = mtod(m_outbuf, struct tftphdr *); 259 memset(tftp, 0, packetlen); 260 261 tftp->th_opcode = htons((short)RRQ); 262 cp = tftp->th_stuff; 263 (void)strncpy(cp, trh->trh_nd->nd_bootfile, namelen); 264 cp += namelen; 265 (void)strncpy(cp, octetstr, sizeof(octetstr)); 266 267 /* 268 * Perform the file transfer 269 */ 270 sin = (struct sockaddr_in *)&trh->trh_nd->nd_root.ndm_saddr; 271 printf("tftproot: download %s:%s ", 272 inet_ntoa(sin->sin_addr), trh->trh_nd->nd_bootfile); 273 274 do { 275 /* 276 * Show progress for every 200 blocks (100kB) 277 */ 278 #ifndef TFTPROOT_PROGRESS 279 #define TFTPROOT_PROGRESS 200 280 #endif 281 if ((trh->trh_block % TFTPROOT_PROGRESS) == 0) 282 twiddle(); 283 284 /* 285 * Send the packet and receive the answer. 286 * We get the sender address here, which should be 287 * the same server with a different port 288 */ 289 if ((error = nfs_boot_sendrecv(so, m_serv, NULL, m_outbuf, 290 tftproot_recv, NULL, &m_serv, trh, l)) != 0) { 291 DPRINTF(("%s():%d sendrecv failed %d\n", 292 __func__, __LINE__, error)); 293 goto out; 294 } 295 296 /* 297 * Accomodate the packet length for acks. 298 * This is really needed only on first pass 299 */ 300 m_outbuf->m_len = hdrlen; 301 m_outbuf->m_pkthdr.len = hdrlen; 302 tftp->th_opcode = htons((short)ACK); 303 tftp->th_block = htons(trh->trh_block); 304 305 306 /* 307 * Check for termination 308 */ 309 if (trh->trh_flags & TRH_FINISHED) 310 break; 311 312 trh->trh_block++; 313 } while (1/* CONSTCOND */); 314 315 printf("\n"); 316 317 /* 318 * Ack the last block. so_send frees m_outbuf, therefore 319 * we do not want to free it ourselves. 320 * Ignore errors, as we already have the whole file. 321 */ 322 if ((error = (*so->so_send)(so, m_serv, NULL, 323 m_outbuf, NULL, 0, l)) != 0) 324 DPRINTF(("%s():%d tftproot: sosend returned %d\n", 325 __func__, __LINE__, error)); 326 else 327 m_outbuf = NULL; 328 329 /* 330 * And use it as the root ramdisk. 331 */ 332 DPRINTF(("%s():%d RAMdisk loaded: %ld@%p\n", 333 __func__, __LINE__, trh->trh_len, trh->trh_base)); 334 md_root_setconf(trh->trh_base, trh->trh_len); 335 mdattach(0); 336 337 error = 0; 338 out: 339 if (m_serv) 340 m_freem(m_serv); 341 342 if (m_outbuf) 343 m_freem(m_outbuf); 344 345 if (so) 346 soclose(so); 347 348 return error; 349 } 350 351 static int 352 tftproot_recv(struct mbuf *m, void *ctx) 353 { 354 struct tftproot_handle *trh = ctx; 355 struct tftphdr *tftp; 356 size_t newlen; 357 size_t hdrlen = sizeof(*tftp) - sizeof(tftp->th_data); 358 359 /* 360 * Check for short packet 361 */ 362 if (m->m_pkthdr.len < hdrlen) { 363 DPRINTF(("%s():%d short reply (%d bytes)\n", 364 __func__, __LINE__, m->m_pkthdr.len)); 365 return -1; 366 } 367 368 /* 369 * Check for packet too large for being a TFTP packet 370 */ 371 if (m->m_pkthdr.len > hdrlen + SEGSIZE) { 372 DPRINTF(("%s():%d packet too big (%d bytes)\n", 373 __func__, __LINE__, m->m_pkthdr.len)); 374 return -1; 375 } 376 377 378 /* 379 * Examine the TFTP header 380 */ 381 if (m->m_len > sizeof(*tftp)) { 382 if ((m = m_pullup(m, sizeof(*tftp))) == NULL) { 383 DPRINTF(("%s():%d m_pullup failed\n", 384 __func__, __LINE__)); 385 return -1; 386 } 387 } 388 tftp = mtod(m, struct tftphdr *); 389 390 /* 391 * We handle data or error 392 */ 393 switch(ntohs(tftp->th_opcode)) { 394 case DATA: 395 break; 396 397 case ERROR: { 398 char errbuf[SEGSIZE + 1]; 399 int i; 400 401 for (i = 0; i < SEGSIZE; i++) { 402 if ((tftp->th_data[i] < ' ') || 403 (tftp->th_data[i] > '~')) { 404 errbuf[i] = '\0'; 405 break; 406 } 407 errbuf[i] = tftp->th_data[i]; 408 } 409 errbuf[SEGSIZE] = '\0'; 410 411 printf("tftproot: TFTP server returned error %d, %s\n", 412 ntohs(tftp->th_code), errbuf); 413 414 return -1; 415 break; 416 } 417 418 default: 419 DPRINTF(("%s():%d unexpected tftp reply opcode %d\n", 420 __func__, __LINE__, ntohs(tftp->th_opcode))); 421 return -1; 422 break; 423 } 424 425 /* 426 * Check for last packet, which does not fill the whole space 427 */ 428 if (m->m_pkthdr.len < hdrlen + SEGSIZE) { 429 DPRINTF(("%s():%d last chunk (%d bytes)\n", 430 __func__, __LINE__, m->m_pkthdr.len)); 431 trh->trh_flags |= TRH_FINISHED; 432 } 433 434 435 if (ntohs(tftp->th_block) != trh->trh_block) { 436 DPRINTF(("%s():%d expected block %d, got block %d\n", 437 __func__, __LINE__, trh->trh_block, ntohs(tftp->th_block))); 438 return -1; 439 } 440 441 /* 442 * Grow the receiving buffer to accomodate new data 443 */ 444 newlen = trh->trh_len + (m->m_pkthdr.len - hdrlen); 445 if ((trh->trh_base = realloc(trh->trh_base, 446 newlen, M_TEMP, M_WAITOK)) == NULL) { 447 DPRINTF(("%s():%d failed to realloc %ld bytes\n", 448 __func__, __LINE__, (long)newlen)); 449 return -1; 450 } 451 452 /* 453 * Copy the data 454 */ 455 m_copydata(m, hdrlen, m->m_pkthdr.len - hdrlen, 456 (char *)trh->trh_base + trh->trh_len); 457 trh->trh_len = newlen; 458 459 return 0; 460 } 461 462
Indexes created Thu Sep 25 16:09:42 GMT 2025