subr_tftproot.c revision 1.5.2.2
1 /* $NetBSD: subr_tftproot.c,v 1.5.2.2 2009/09/16 13:38:01 yamt 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 1.5.2.2 2009/09/16 13:38:01 yamt 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 } 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 /* 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(struct mbuf *m, void *ctx) 354 { 355 struct tftproot_handle *trh = ctx; 356 struct tftphdr *tftp; 357 size_t newlen; 358 size_t hdrlen = sizeof(*tftp) - sizeof(tftp->th_data); 359 360 /* 361 * Check for short packet 362 */ 363 if (m->m_pkthdr.len < hdrlen) { 364 DPRINTF(("%s():%d short reply (%d bytes)\n", 365 __func__, __LINE__, m->m_pkthdr.len)); 366 return -1; 367 } 368 369 /* 370 * Check for packet too large for being a TFTP packet 371 */ 372 if (m->m_pkthdr.len > hdrlen + SEGSIZE) { 373 DPRINTF(("%s():%d packet too big (%d bytes)\n", 374 __func__, __LINE__, m->m_pkthdr.len)); 375 return -1; 376 } 377 378 379 /* 380 * Examine the TFTP header 381 */ 382 if (m->m_len > sizeof(*tftp)) { 383 if ((m = m_pullup(m, sizeof(*tftp))) == NULL) { 384 DPRINTF(("%s():%d m_pullup failed\n", 385 __func__, __LINE__)); 386 return -1; 387 } 388 } 389 tftp = mtod(m, struct tftphdr *); 390 391 /* 392 * We handle data or error 393 */ 394 switch(ntohs(tftp->th_opcode)) { 395 case DATA: 396 break; 397 398 case ERROR: { 399 char errbuf[SEGSIZE + 1]; 400 int i; 401 402 for (i = 0; i < SEGSIZE; i++) { 403 if ((tftp->th_data[i] < ' ') || 404 (tftp->th_data[i] > '~')) { 405 errbuf[i] = '\0'; 406 break; 407 } 408 errbuf[i] = tftp->th_data[i]; 409 } 410 errbuf[SEGSIZE] = '\0'; 411 412 printf("tftproot: TFTP server returned error %d, %s\n", 413 ntohs(tftp->th_code), errbuf); 414 415 return -1; 416 break; 417 } 418 419 default: 420 DPRINTF(("%s():%d unexpected tftp reply opcode %d\n", 421 __func__, __LINE__, ntohs(tftp->th_opcode))); 422 return -1; 423 break; 424 } 425 426 /* 427 * Check for last packet, which does not fill the whole space 428 */ 429 if (m->m_pkthdr.len < hdrlen + SEGSIZE) { 430 DPRINTF(("%s():%d last chunk (%d bytes)\n", 431 __func__, __LINE__, m->m_pkthdr.len)); 432 trh->trh_flags |= TRH_FINISHED; 433 } 434 435 436 if (ntohs(tftp->th_block) != trh->trh_block) { 437 DPRINTF(("%s():%d expected block %d, got block %d\n", 438 __func__, __LINE__, trh->trh_block, ntohs(tftp->th_block))); 439 return -1; 440 } 441 442 /* 443 * Grow the receiving buffer to accomodate new data 444 */ 445 newlen = trh->trh_len + (m->m_pkthdr.len - hdrlen); 446 if ((trh->trh_base = realloc(trh->trh_base, 447 newlen, M_TEMP, M_WAITOK)) == NULL) { 448 DPRINTF(("%s():%d failed to realloc %ld bytes\n", 449 __func__, __LINE__, (long)newlen)); 450 return -1; 451 } 452 453 /* 454 * Copy the data 455 */ 456 m_copydata(m, hdrlen, m->m_pkthdr.len - hdrlen, 457 (char *)trh->trh_base + trh->trh_len); 458 trh->trh_len = newlen; 459 460 return 0; 461 } 462 463
Indexes created Sat Sep 27 14:09:57 GMT 2025