1 /* $NetBSD: subr_tftproot.c,v 1.5.12.1 2009/09/05 13:04:26 bouyer 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 1.5.12.1 2009/09/05 13:04:26 bouyer 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 }
138
139 if ((ifp == NULL) &&
140 (bootdv != NULL && device_class(bootdv) == DV_IFNET)) {
141 IFNET_FOREACH(ifp)
142 if (strcmp(device_xname(bootdv), ifp->if_xname) == 0)
143 break;
144 }
145
146 if (ifp == NULL) {
147 DPRINTF(("%s():%d ifp is NULL\n", __func__, __LINE__));
148 goto out;
149 }
150
151 dv = device_find_by_xname(ifp->if_xname);
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 = kmem_zalloc(sizeof(*nd), KM_SLEEP);
164 nd->nd_ifp = ifp;
165 nd->nd_nomount = 1;
166
167 if ((error = nfs_boot_init(nd, l)) != 0) {
168 DPRINTF(("%s():%d nfs_boot_init returned %d\n",
169 __func__, __LINE__, error));
170 goto out;
171 }
172
173 /*
174 * Strip leading "tftp:"
175 */
176 #define PREFIX "tftp:"
177 if (strstr(nd->nd_bootfile, PREFIX) == nd->nd_bootfile)
178 (void)memmove(nd->nd_bootfile,
179 nd->nd_bootfile + (sizeof(PREFIX) - 1),
180 sizeof(nd->nd_bootfile) - sizeof(PREFIX));
181 #undef PREFIX
182
183 printf("tftproot: bootfile=%s\n", nd->nd_bootfile);
184
185 bzero(&trh, sizeof(trh));
186 trh.trh_nd = nd;
187 trh.trh_block = 1;
188
189 if ((error = tftproot_getfile(&trh, l)) != 0) {
190 DPRINTF(("%s():%d tftproot_getfile returned %d\n",
191 __func__, __LINE__, error));
192 goto out;
193 }
194
195 error = 0;
196
197 out:
198 if (nd)
199 kmem_free(nd, sizeof(*nd));
200
201 return error;
202 }
203
204 static int
205 tftproot_getfile(trh, l)
206 struct tftproot_handle *trh;
207 struct lwp *l;
208 {
209 struct socket *so = NULL;
210 struct mbuf *m_serv = NULL;
211 struct mbuf *m_outbuf = NULL;
212 struct sockaddr_in *sin;
213 struct tftphdr *tftp;
214 size_t packetlen, namelen;
215 int error = -1;
216 const char octetstr[] = "octet";
217 size_t hdrlen = sizeof(*tftp) - sizeof(tftp->th_data);
218 char *cp;
219 /* struct device *dv; */
220
221 if ((error = socreate(AF_INET, &so, SOCK_DGRAM, 0, l, NULL)) != 0) {
222 DPRINTF(("%s():%d socreate returned %d\n",
223 __func__, __LINE__, error));
224 goto out;
225 }
226
227 /*
228 * Set timeout
229 */
230 if ((error = nfs_boot_setrecvtimo(so))) {
231 DPRINTF(("%s():%d SO_RCVTIMEO failed %d\n",
232 __func__, __LINE__, error));
233 goto out;
234 }
235
236 /*
237 * Set server address and port
238 */
239 m_serv = m_get(M_WAIT, MT_SONAME);
240 m_serv->m_len = sizeof(*sin);
241 sin = mtod(m_serv, struct sockaddr_in *);
242 memcpy(sin, &trh->trh_nd->nd_root.ndm_saddr, sizeof(*sin));
243 sin->sin_port = htons(IPPORT_TFTP);
244
245 /*
246 * Set send buffer, prepare the TFTP packet
247 */
248 namelen = strlen(trh->trh_nd->nd_bootfile) + 1;
249 packetlen = sizeof(tftp->th_opcode) + namelen + sizeof(octetstr);
250 if (packetlen > MSIZE) {
251 DPRINTF(("%s():%d boot filename too long (%ld bytes)\n",
252 __func__, __LINE__, (long)namelen));
253 goto out;
254 }
255
256 m_outbuf = m_gethdr(M_WAIT, MT_DATA);
257 m_clget(m_outbuf, M_WAIT);
258 m_outbuf->m_len = packetlen;
259 m_outbuf->m_pkthdr.len = packetlen;
260 m_outbuf->m_pkthdr.rcvif = NULL;
261
262 tftp = mtod(m_outbuf, struct tftphdr *);
263 memset(tftp, 0, packetlen);
264
265 tftp->th_opcode = htons((short)RRQ);
266 cp = tftp->th_stuff;
267 (void)strncpy(cp, trh->trh_nd->nd_bootfile, namelen);
268 cp += namelen;
269 (void)strncpy(cp, octetstr, sizeof(octetstr));
270
271 /*
272 * Perform the file transfer
273 */
274 sin = (struct sockaddr_in *)&trh->trh_nd->nd_root.ndm_saddr;
275 printf("tftproot: download %s:%s ",
276 inet_ntoa(sin->sin_addr), trh->trh_nd->nd_bootfile);
277
278 do {
279 /*
280 * Show progress for every 200 blocks (100kB)
281 */
282 #ifndef TFTPROOT_PROGRESS
283 #define TFTPROOT_PROGRESS 200
284 #endif
285 if ((trh->trh_block % TFTPROOT_PROGRESS) == 0)
286 twiddle();
287
288 /*
289 * Send the packet and receive the answer.
290 * We get the sender address here, which should be
291 * the same server with a different port
292 */
293 if ((error = nfs_boot_sendrecv(so, m_serv, NULL, m_outbuf,
294 tftproot_recv, NULL, &m_serv, trh, l)) != 0) {
295 DPRINTF(("%s():%d sendrecv failed %d\n",
296 __func__, __LINE__, error));
297 goto out;
298 }
299
300 /*
301 * Accomodate the packet length for acks.
302 * This is really needed only on first pass
303 */
304 m_outbuf->m_len = hdrlen;
305 m_outbuf->m_pkthdr.len = hdrlen;
306 tftp->th_opcode = htons((short)ACK);
307 tftp->th_block = htons(trh->trh_block);
308
309
310 /*
311 * Check for termination
312 */
313 if (trh->trh_flags & TRH_FINISHED)
314 break;
315
316 trh->trh_block++;
317 } while (1/* CONSTCOND */);
318
319 printf("\n");
320
321 /*
322 * Ack the last block. so_send frees m_outbuf, therefore
323 * we do not want to free it ourselves.
324 * Ignore errors, as we already have the whole file.
325 */
326 if ((error = (*so->so_send)(so, m_serv, NULL,
327 m_outbuf, NULL, 0, l)) != 0)
328 DPRINTF(("%s():%d tftproot: sosend returned %d\n",
329 __func__, __LINE__, error));
330 else
331 m_outbuf = NULL;
332
333 /*
334 * And use it as the root ramdisk.
335 */
336 DPRINTF(("%s():%d RAMdisk loaded: %ld@%p\n",
337 __func__, __LINE__, trh->trh_len, trh->trh_base));
338 md_root_setconf(trh->trh_base, trh->trh_len);
339 mdattach(0);
340
341 error = 0;
342 out:
343 if (m_serv)
344 m_freem(m_serv);
345
346 if (m_outbuf)
347 m_freem(m_outbuf);
348
349 if (so)
350 soclose(so);
351
352 return error;
353 }
354
355 static int
356 tftproot_recv(m, ctx)
357 struct mbuf *m;
358 void *ctx;
359 {
360 struct tftproot_handle *trh = ctx;
361 struct tftphdr *tftp;
362 size_t newlen;
363 size_t hdrlen = sizeof(*tftp) - sizeof(tftp->th_data);
364
365 /*
366 * Check for short packet
367 */
368 if (m->m_pkthdr.len < hdrlen) {
369 DPRINTF(("%s():%d short reply (%d bytes)\n",
370 __func__, __LINE__, m->m_pkthdr.len));
371 return -1;
372 }
373
374 /*
375 * Check for packet too large for being a TFTP packet
376 */
377 if (m->m_pkthdr.len > hdrlen + SEGSIZE) {
378 DPRINTF(("%s():%d packet too big (%d bytes)\n",
379 __func__, __LINE__, m->m_pkthdr.len));
380 return -1;
381 }
382
383
384 /*
385 * Examine the TFTP header
386 */
387 if (m->m_len > sizeof(*tftp)) {
388 if ((m = m_pullup(m, sizeof(*tftp))) == NULL) {
389 DPRINTF(("%s():%d m_pullup failed\n",
390 __func__, __LINE__));
391 return -1;
392 }
393 }
394 tftp = mtod(m, struct tftphdr *);
395
396 /*
397 * We handle data or error
398 */
399 switch(ntohs(tftp->th_opcode)) {
400 case DATA:
401 break;
402
403 case ERROR: {
404 char errbuf[SEGSIZE + 1];
405 int i;
406
407 for (i = 0; i < SEGSIZE; i++) {
408 if ((tftp->th_data[i] < ' ') ||
409 (tftp->th_data[i] > '~')) {
410 errbuf[i] = '\0';
411 break;
412 }
413 errbuf[i] = tftp->th_data[i];
414 }
415 errbuf[SEGSIZE] = '\0';
416
417 printf("tftproot: TFTP server returned error %d, %s\n",
418 ntohs(tftp->th_code), errbuf);
419
420 return -1;
421 break;
422 }
423
424 default:
425 DPRINTF(("%s():%d unexpected tftp reply opcode %d\n",
426 __func__, __LINE__, ntohs(tftp->th_opcode)));
427 return -1;
428 break;
429 }
430
431 /*
432 * Check for last packet, which does not fill the whole space
433 */
434 if (m->m_pkthdr.len < hdrlen + SEGSIZE) {
435 DPRINTF(("%s():%d last chunk (%d bytes)\n",
436 __func__, __LINE__, m->m_pkthdr.len));
437 trh->trh_flags |= TRH_FINISHED;
438 }
439
440
441 if (ntohs(tftp->th_block) != trh->trh_block) {
442 DPRINTF(("%s():%d expected block %d, got block %d\n",
443 __func__, __LINE__, trh->trh_block, ntohs(tftp->th_block)));
444 return -1;
445 }
446
447 /*
448 * Grow the receiving buffer to accomodate new data
449 */
450 newlen = trh->trh_len + (m->m_pkthdr.len - hdrlen);
451 if ((trh->trh_base = realloc(trh->trh_base,
452 newlen, M_TEMP, M_WAITOK)) == NULL) {
453 DPRINTF(("%s():%d failed to realloc %ld bytes\n",
454 __func__, __LINE__, (long)newlen));
455 return -1;
456 }
457
458 /*
459 * Copy the data
460 */
461 m_copydata(m, hdrlen, m->m_pkthdr.len - hdrlen,
462 (char *)trh->trh_base + trh->trh_len);
463 trh->trh_len = newlen;
464
465 return 0;
466 }
467
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