subr_tftproot.c revision 1.5.10.1
1 /* $NetBSD: subr_tftproot.c,v 1.5.10.1 2009/04/28 07:37:00 skrll 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 1.5.10.1 2009/04/28 07:37:00 skrll 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(struct mbuf*, void*); 121 122 int 123 tftproot_dhcpboot(struct device *bootdv) 124 { 125 struct nfs_diskless *nd = NULL; 126 struct ifnet *ifp = NULL; 127 struct lwp *l; 128 struct tftproot_handle trh; 129 struct device *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 } else if ((bootdv != NULL && device_class(bootdv) == DV_IFNET)) { 137 IFNET_FOREACH(ifp) 138 if (strcmp(device_xname(bootdv), ifp->if_xname) == 0) 139 break; 140 } 141 142 if (ifp == NULL) { 143 DPRINTF(("%s():%d ifp is NULL\n", __func__, __LINE__)); 144 goto out; 145 } 146 147 dv = device_find_by_xname(ifp->if_xname); 148 149 if ((dv == NULL) || (device_class(dv) != DV_IFNET)) { 150 DPRINTF(("%s():%d cannot find device for interface %s\n", 151 __func__, __LINE__, ifp->if_xname)); 152 goto out; 153 } 154 155 root_device = dv; 156 157 l = curlwp; /* XXX */ 158 159 nd = kmem_zalloc(sizeof(*nd), KM_SLEEP); 160 nd->nd_ifp = ifp; 161 nd->nd_nomount = 1; 162 163 if ((error = nfs_boot_init(nd, l)) != 0) { 164 DPRINTF(("%s():%d nfs_boot_init returned %d\n", 165 __func__, __LINE__, error)); 166 goto out; 167 } 168 169 /* 170 * Strip leading "tftp:" 171 */ 172 #define PREFIX "tftp:" 173 if (strstr(nd->nd_bootfile, PREFIX) == nd->nd_bootfile) 174 (void)memmove(nd->nd_bootfile, 175 nd->nd_bootfile + (sizeof(PREFIX) - 1), 176 sizeof(nd->nd_bootfile) - sizeof(PREFIX)); 177 #undef PREFIX 178 179 printf("tftproot: bootfile=%s\n", nd->nd_bootfile); 180 181 memset(&trh, 0, sizeof(trh)); 182 trh.trh_nd = nd; 183 trh.trh_block = 1; 184 185 if ((error = tftproot_getfile(&trh, l)) != 0) { 186 DPRINTF(("%s():%d tftproot_getfile returned %d\n", 187 __func__, __LINE__, error)); 188 goto out; 189 } 190 191 error = 0; 192 193 out: 194 if (nd) 195 kmem_free(nd, sizeof(*nd)); 196 197 return error; 198 } 199 200 static int 201 tftproot_getfile(struct tftproot_handle *trh, struct lwp *l) 202 { 203 struct socket *so = NULL; 204 struct mbuf *m_serv = NULL; 205 struct mbuf *m_outbuf = NULL; 206 struct sockaddr_in *sin; 207 struct tftphdr *tftp; 208 size_t packetlen, namelen; 209 int error = -1; 210 const char octetstr[] = "octet"; 211 size_t hdrlen = sizeof(*tftp) - sizeof(tftp->th_data); 212 char *cp; 213 /* struct device *dv; */ 214 215 if ((error = socreate(AF_INET, &so, SOCK_DGRAM, 0, l, NULL)) != 0) { 216 DPRINTF(("%s():%d socreate returned %d\n", 217 __func__, __LINE__, error)); 218 goto out; 219 } 220 221 /* 222 * Set timeout 223 */ 224 if ((error = nfs_boot_setrecvtimo(so))) { 225 DPRINTF(("%s():%d SO_RCVTIMEO failed %d\n", 226 __func__, __LINE__, error)); 227 goto out; 228 } 229 230 /* 231 * Set server address and port 232 */ 233 m_serv = m_get(M_WAIT, MT_SONAME); 234 m_serv->m_len = sizeof(*sin); 235 sin = mtod(m_serv, struct sockaddr_in *); 236 memcpy(sin, &trh->trh_nd->nd_root.ndm_saddr, sizeof(*sin)); 237 sin->sin_port = htons(IPPORT_TFTP); 238 239 /* 240 * Set send buffer, prepare the TFTP packet 241 */ 242 namelen = strlen(trh->trh_nd->nd_bootfile) + 1; 243 packetlen = sizeof(tftp->th_opcode) + namelen + sizeof(octetstr); 244 if (packetlen > MSIZE) { 245 DPRINTF(("%s():%d boot filename too long (%ld bytes)\n", 246 __func__, __LINE__, (long)namelen)); 247 goto out; 248 } 249 250 m_outbuf = m_gethdr(M_WAIT, MT_DATA); 251 m_clget(m_outbuf, M_WAIT); 252 m_outbuf->m_len = packetlen; 253 m_outbuf->m_pkthdr.len = packetlen; 254 m_outbuf->m_pkthdr.rcvif = NULL; 255 256 tftp = mtod(m_outbuf, struct tftphdr *); 257 memset(tftp, 0, packetlen); 258 259 tftp->th_opcode = htons((short)RRQ); 260 cp = tftp->th_stuff; 261 (void)strncpy(cp, trh->trh_nd->nd_bootfile, namelen); 262 cp += namelen; 263 (void)strncpy(cp, octetstr, sizeof(octetstr)); 264 265 /* 266 * Perform the file transfer 267 */ 268 sin = (struct sockaddr_in *)&trh->trh_nd->nd_root.ndm_saddr; 269 printf("tftproot: download %s:%s ", 270 inet_ntoa(sin->sin_addr), trh->trh_nd->nd_bootfile); 271 272 do { 273 /* 274 * Show progress for every 200 blocks (100kB) 275 */ 276 #ifndef TFTPROOT_PROGRESS 277 #define TFTPROOT_PROGRESS 200 278 #endif 279 if ((trh->trh_block % TFTPROOT_PROGRESS) == 0) 280 twiddle(); 281 282 /* 283 * Send the packet and receive the answer. 284 * We get the sender address here, which should be 285 * the same server with a different port 286 */ 287 if ((error = nfs_boot_sendrecv(so, m_serv, NULL, m_outbuf, 288 tftproot_recv, NULL, &m_serv, trh, l)) != 0) { 289 DPRINTF(("%s():%d sendrecv failed %d\n", 290 __func__, __LINE__, error)); 291 goto out; 292 } 293 294 /* 295 * Accomodate the packet length for acks. 296 * This is really needed only on first pass 297 */ 298 m_outbuf->m_len = hdrlen; 299 m_outbuf->m_pkthdr.len = hdrlen; 300 tftp->th_opcode = htons((short)ACK); 301 tftp->th_block = htons(trh->trh_block); 302 303 304 /* 305 * Check for termination 306 */ 307 if (trh->trh_flags & TRH_FINISHED) 308 break; 309 310 trh->trh_block++; 311 } while (1/* CONSTCOND */); 312 313 printf("\n"); 314 315 /* 316 * Ack the last block. so_send frees m_outbuf, therefore 317 * we do not want to free it ourselves. 318 * Ignore errors, as we already have the whole file. 319 */ 320 if ((error = (*so->so_send)(so, m_serv, NULL, 321 m_outbuf, NULL, 0, l)) != 0) 322 DPRINTF(("%s():%d tftproot: sosend returned %d\n", 323 __func__, __LINE__, error)); 324 else 325 m_outbuf = NULL; 326 327 /* 328 * And use it as the root ramdisk. 329 */ 330 DPRINTF(("%s():%d RAMdisk loaded: %ld@%p\n", 331 __func__, __LINE__, trh->trh_len, trh->trh_base)); 332 md_root_setconf(trh->trh_base, trh->trh_len); 333 mdattach(0); 334 335 error = 0; 336 out: 337 if (m_serv) 338 m_freem(m_serv); 339 340 if (m_outbuf) 341 m_freem(m_outbuf); 342 343 if (so) 344 soclose(so); 345 346 return error; 347 } 348 349 static int 350 tftproot_recv(struct mbuf *m, void *ctx) 351 { 352 struct tftproot_handle *trh = ctx; 353 struct tftphdr *tftp; 354 size_t newlen; 355 size_t hdrlen = sizeof(*tftp) - sizeof(tftp->th_data); 356 357 /* 358 * Check for short packet 359 */ 360 if (m->m_pkthdr.len < hdrlen) { 361 DPRINTF(("%s():%d short reply (%d bytes)\n", 362 __func__, __LINE__, m->m_pkthdr.len)); 363 return -1; 364 } 365 366 /* 367 * Check for packet too large for being a TFTP packet 368 */ 369 if (m->m_pkthdr.len > hdrlen + SEGSIZE) { 370 DPRINTF(("%s():%d packet too big (%d bytes)\n", 371 __func__, __LINE__, m->m_pkthdr.len)); 372 return -1; 373 } 374 375 376 /* 377 * Examine the TFTP header 378 */ 379 if (m->m_len > sizeof(*tftp)) { 380 if ((m = m_pullup(m, sizeof(*tftp))) == NULL) { 381 DPRINTF(("%s():%d m_pullup failed\n", 382 __func__, __LINE__)); 383 return -1; 384 } 385 } 386 tftp = mtod(m, struct tftphdr *); 387 388 /* 389 * We handle data or error 390 */ 391 switch(ntohs(tftp->th_opcode)) { 392 case DATA: 393 break; 394 395 case ERROR: { 396 char errbuf[SEGSIZE + 1]; 397 int i; 398 399 for (i = 0; i < SEGSIZE; i++) { 400 if ((tftp->th_data[i] < ' ') || 401 (tftp->th_data[i] > '~')) { 402 errbuf[i] = '\0'; 403 break; 404 } 405 errbuf[i] = tftp->th_data[i]; 406 } 407 errbuf[SEGSIZE] = '\0'; 408 409 printf("tftproot: TFTP server returned error %d, %s\n", 410 ntohs(tftp->th_code), errbuf); 411 412 return -1; 413 break; 414 } 415 416 default: 417 DPRINTF(("%s():%d unexpected tftp reply opcode %d\n", 418 __func__, __LINE__, ntohs(tftp->th_opcode))); 419 return -1; 420 break; 421 } 422 423 /* 424 * Check for last packet, which does not fill the whole space 425 */ 426 if (m->m_pkthdr.len < hdrlen + SEGSIZE) { 427 DPRINTF(("%s():%d last chunk (%d bytes)\n", 428 __func__, __LINE__, m->m_pkthdr.len)); 429 trh->trh_flags |= TRH_FINISHED; 430 } 431 432 433 if (ntohs(tftp->th_block) != trh->trh_block) { 434 DPRINTF(("%s():%d expected block %d, got block %d\n", 435 __func__, __LINE__, trh->trh_block, ntohs(tftp->th_block))); 436 return -1; 437 } 438 439 /* 440 * Grow the receiving buffer to accomodate new data 441 */ 442 newlen = trh->trh_len + (m->m_pkthdr.len - hdrlen); 443 if ((trh->trh_base = realloc(trh->trh_base, 444 newlen, M_TEMP, M_WAITOK)) == NULL) { 445 DPRINTF(("%s():%d failed to realloc %ld bytes\n", 446 __func__, __LINE__, (long)newlen)); 447 return -1; 448 } 449 450 /* 451 * Copy the data 452 */ 453 m_copydata(m, hdrlen, m->m_pkthdr.len - hdrlen, 454 (char *)trh->trh_base + trh->trh_len); 455 trh->trh_len = newlen; 456 457 return 0; 458 } 459 460
Indexes created Fri Sep 26 08:10:20 GMT 2025