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[netbsd-mini2440.git] / sys / dist / pf / net / pf_osfp.c
blob7c3a117cc6c65ef54a2be46ade27b6a92b657348
1 /* $NetBSD: pf_osfp.c,v 1.8 2008/06/18 09:06:27 yamt Exp $ */
2 /* $OpenBSD: pf_osfp.c,v 1.12 2006/12/13 18:14:10 itojun Exp $ */
3
4 /*
5 * Copyright (c) 2003 Mike Frantzen <frantzen@w4g.org>
6 *
7 * Permission to use, copy, modify, and distribute this software for any
8 * purpose with or without fee is hereby granted, provided that the above
9 * copyright notice and this permission notice appear in all copies.
10 *
11 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
12 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
13 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
14 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
15 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
16 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
17 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
18 *
19 */
20
21 #include <sys/cdefs.h>
22 __KERNEL_RCSID(0, "$NetBSD: pf_osfp.c,v 1.8 2008/06/18 09:06:27 yamt Exp $");
23
24 #ifdef _KERNEL_OPT
25 #include "opt_inet.h"
26 #endif
27
28 #include <sys/param.h>
29 #include <sys/socket.h>
30 #ifdef _KERNEL
31 # include <sys/systm.h>
32 #endif /* _KERNEL */
33 #include <sys/mbuf.h>
34
35 #include <netinet/in.h>
36 #include <netinet/in_systm.h>
37 #include <netinet/ip.h>
38 #include <netinet/tcp.h>
39
40 #include <net/if.h>
41 #include <net/pfvar.h>
42
43 #include <netinet/ip6.h>
44 #ifdef _KERNEL
45 #include <netinet6/in6_var.h>
46 #endif
47
48
49 #ifdef _KERNEL
50 # define DPFPRINTF(format, x...) \
51 if (pf_status.debug >= PF_DEBUG_NOISY) \
52 printf(format , ##x)
53 typedef struct pool pool_t;
54
55 #else
56 /* Userland equivalents so we can lend code to tcpdump et al. */
57
58 # include <arpa/inet.h>
59 # include <errno.h>
60 # include <stdio.h>
61 # include <stdlib.h>
62 # include <string.h>
63 # include <netdb.h>
64 # define pool_t int
65 # define pool_get(pool, flags) malloc(*(pool))
66 # define pool_put(pool, item) free(item)
67 # define pool_init(pool, size, a, ao, f, m, p) (*(pool)) = (size)
68
69 # ifdef PFDEBUG
70 # include <sys/stdarg.h>
71 # define DPFPRINTF(format, x...) fprintf(stderr, format , ##x)
72 # else
73 # define DPFPRINTF(format, x...) ((void)0)
74 # endif /* PFDEBUG */
75 #endif /* _KERNEL */
76
77
78 SLIST_HEAD(pf_osfp_list, pf_os_fingerprint) pf_osfp_list;
79 pool_t pf_osfp_entry_pl;
80 pool_t pf_osfp_pl;
81
82 struct pf_os_fingerprint *pf_osfp_find(struct pf_osfp_list *,
83 struct pf_os_fingerprint *, u_int8_t);
84 struct pf_os_fingerprint *pf_osfp_find_exact(struct pf_osfp_list *,
85 struct pf_os_fingerprint *);
86 void pf_osfp_insert(struct pf_osfp_list *,
87 struct pf_os_fingerprint *);
88
89
90 #ifdef _KERNEL
91 /*
92 * Passively fingerprint the OS of the host (IPv4 TCP SYN packets only)
93 * Returns the list of possible OSes.
94 */
95 struct pf_osfp_enlist *
96 pf_osfp_fingerprint(struct pf_pdesc *pd, struct mbuf *m, int off,
97 const struct tcphdr *tcp)
98 {
99 struct ip *ip;
100 struct ip6_hdr *ip6;
101 char hdr[60];
102
103 if ((pd->af != PF_INET && pd->af != PF_INET6) ||
104 pd->proto != IPPROTO_TCP || (tcp->th_off << 2) < sizeof(*tcp))
105 return (NULL);
106
107 if (pd->af == PF_INET) {
108 ip = mtod(m, struct ip *);
109 ip6 = (struct ip6_hdr *)NULL;
110 } else {
111 ip = (struct ip *)NULL;
112 ip6 = mtod(m, struct ip6_hdr *);
113 }
114 if (!pf_pull_hdr(m, off, hdr, tcp->th_off << 2, NULL, NULL,
115 pd->af)) return (NULL);
116
117 return (pf_osfp_fingerprint_hdr(ip, ip6, (struct tcphdr *)hdr));
118 }
119 #endif /* _KERNEL */
120
121 struct pf_osfp_enlist *
122 pf_osfp_fingerprint_hdr(const struct ip *ip, const struct ip6_hdr *ip6, const struct tcphdr *tcp)
123 {
124 struct pf_os_fingerprint fp, *fpresult;
125 int cnt, optlen = 0;
126 const u_int8_t *optp;
127 #ifdef _KERNEL
128 char srcname[128];
129 #else
130 char srcname[NI_MAXHOST];
131 #endif
132
133 if ((tcp->th_flags & (TH_SYN|TH_ACK)) != TH_SYN)
134 return (NULL);
135 if (ip) {
136 if ((ip->ip_off & htons(IP_OFFMASK)) != 0)
137 return (NULL);
138 }
139
140 memset(&fp, 0, sizeof(fp));
141
142 if (ip) {
143 #ifndef _KERNEL
144 struct sockaddr_in sin;
145 #endif
146
147 fp.fp_psize = ntohs(ip->ip_len);
148 fp.fp_ttl = ip->ip_ttl;
149 if (ip->ip_off & htons(IP_DF))
150 fp.fp_flags |= PF_OSFP_DF;
151 #ifdef _KERNEL
152 strlcpy(srcname, inet_ntoa(ip->ip_src), sizeof(srcname));
153 #else
154 memset(&sin, 0, sizeof(sin));
155 sin.sin_family = AF_INET;
156 sin.sin_len = sizeof(struct sockaddr_in);
157 sin.sin_addr = ip->ip_src;
158 (void)getnameinfo((struct sockaddr *)&sin,
159 sizeof(struct sockaddr_in), srcname, sizeof(srcname),
160 NULL, 0, NI_NUMERICHOST);
161 #endif
162 }
163 #ifdef INET6
164 else if (ip6) {
165 #ifndef _KERNEL
166 struct sockaddr_in6 sin6;
167 #endif
168
169 /* jumbo payload? */
170 fp.fp_psize = sizeof(struct ip6_hdr) + ntohs(ip6->ip6_plen);
171 fp.fp_ttl = ip6->ip6_hlim;
172 fp.fp_flags |= PF_OSFP_DF;
173 fp.fp_flags |= PF_OSFP_INET6;
174 #ifdef _KERNEL
175 strlcpy(srcname,
176 ip6_sprintf((const struct in6_addr *)&ip6->ip6_src),
177 sizeof(srcname));
178 #else
179 memset(&sin6, 0, sizeof(sin6));
180 sin6.sin6_family = AF_INET6;
181 sin6.sin6_len = sizeof(struct sockaddr_in6);
182 sin6.sin6_addr = ip6->ip6_src;
183 (void)getnameinfo((struct sockaddr *)&sin6,
184 sizeof(struct sockaddr_in6), srcname, sizeof(srcname),
185 NULL, 0, NI_NUMERICHOST);
186 #endif
187 }
188 #endif
189 else
190 return (NULL);
191 fp.fp_wsize = ntohs(tcp->th_win);
192
193
194 cnt = (tcp->th_off << 2) - sizeof(*tcp);
195 optp = (const u_int8_t *)((const char *)tcp + sizeof(*tcp));
196 for (; cnt > 0; cnt -= optlen, optp += optlen) {
197 if (*optp == TCPOPT_EOL)
198 break;
199
200 fp.fp_optcnt++;
201 if (*optp == TCPOPT_NOP) {
202 fp.fp_tcpopts = (fp.fp_tcpopts << PF_OSFP_TCPOPT_BITS) |
203 PF_OSFP_TCPOPT_NOP;
204 optlen = 1;
205 } else {
206 if (cnt < 2)
207 return (NULL);
208 optlen = optp[1];
209 if (optlen > cnt || optlen < 2)
210 return (NULL);
211 switch (*optp) {
212 case TCPOPT_MAXSEG:
213 if (optlen >= TCPOLEN_MAXSEG)
214 memcpy(&fp.fp_mss, &optp[2],
215 sizeof(fp.fp_mss));
216 fp.fp_tcpopts = (fp.fp_tcpopts <<
217 PF_OSFP_TCPOPT_BITS) | PF_OSFP_TCPOPT_MSS;
218 NTOHS(fp.fp_mss);
219 break;
220 case TCPOPT_WINDOW:
221 if (optlen >= TCPOLEN_WINDOW)
222 memcpy(&fp.fp_wscale, &optp[2],
223 sizeof(fp.fp_wscale));
224 NTOHS(fp.fp_wscale);
225 fp.fp_tcpopts = (fp.fp_tcpopts <<
226 PF_OSFP_TCPOPT_BITS) |
227 PF_OSFP_TCPOPT_WSCALE;
228 break;
229 case TCPOPT_SACK_PERMITTED:
230 fp.fp_tcpopts = (fp.fp_tcpopts <<
231 PF_OSFP_TCPOPT_BITS) | PF_OSFP_TCPOPT_SACK;
232 break;
233 case TCPOPT_TIMESTAMP:
234 if (optlen >= TCPOLEN_TIMESTAMP) {
235 u_int32_t ts;
236 memcpy(&ts, &optp[2], sizeof(ts));
237 if (ts == 0)
238 fp.fp_flags |= PF_OSFP_TS0;
239
240 }
241 fp.fp_tcpopts = (fp.fp_tcpopts <<
242 PF_OSFP_TCPOPT_BITS) | PF_OSFP_TCPOPT_TS;
243 break;
244 default:
245 return (NULL);
246 }
247 }
248 optlen = MAX(optlen, 1); /* paranoia */
249 }
250
251 DPFPRINTF("fingerprinted %s:%d %d:%d:%d:%d:%llx (%d) "
252 "(TS=%s,M=%s%d,W=%s%d)\n",
253 srcname, ntohs(tcp->th_sport),
254 fp.fp_wsize, fp.fp_ttl, (fp.fp_flags & PF_OSFP_DF) != 0,
255 fp.fp_psize, (long long int)fp.fp_tcpopts, fp.fp_optcnt,
256 (fp.fp_flags & PF_OSFP_TS0) ? "0" : "",
257 (fp.fp_flags & PF_OSFP_MSS_MOD) ? "%" :
258 (fp.fp_flags & PF_OSFP_MSS_DC) ? "*" : "",
259 fp.fp_mss,
260 (fp.fp_flags & PF_OSFP_WSCALE_MOD) ? "%" :
261 (fp.fp_flags & PF_OSFP_WSCALE_DC) ? "*" : "",
262 fp.fp_wscale);
263
264 if ((fpresult = pf_osfp_find(&pf_osfp_list, &fp,
265 PF_OSFP_MAXTTL_OFFSET)))
266 return (&fpresult->fp_oses);
267 return (NULL);
268 }
269
270 /* Match a fingerprint ID against a list of OSes */
271 int
272 pf_osfp_match(struct pf_osfp_enlist *list, pf_osfp_t os)
273 {
274 struct pf_osfp_entry *entry;
275 int os_class, os_version, os_subtype;
276 int en_class, en_version, en_subtype;
277
278 if (os == PF_OSFP_ANY)
279 return (1);
280 if (list == NULL) {
281 DPFPRINTF("osfp no match against %x\n", os);
282 return (os == PF_OSFP_UNKNOWN);
283 }
284 PF_OSFP_UNPACK(os, os_class, os_version, os_subtype);
285 SLIST_FOREACH(entry, list, fp_entry) {
286 PF_OSFP_UNPACK(entry->fp_os, en_class, en_version, en_subtype);
287 if ((os_class == PF_OSFP_ANY || en_class == os_class) &&
288 (os_version == PF_OSFP_ANY || en_version == os_version) &&
289 (os_subtype == PF_OSFP_ANY || en_subtype == os_subtype)) {
290 DPFPRINTF("osfp matched %s %s %s %x==%x\n",
291 entry->fp_class_nm, entry->fp_version_nm,
292 entry->fp_subtype_nm, os, entry->fp_os);
293 return (1);
294 }
295 }
296 DPFPRINTF("fingerprint 0x%x didn't match\n", os);
297 return (0);
298 }
299
300 /* Initialize the OS fingerprint system */
301 void
302 pf_osfp_initialize(void)
303 {
304 #ifdef __NetBSD__
305 pool_init(&pf_osfp_entry_pl, sizeof(struct pf_osfp_entry), 0, 0, 0,
306 "pfosfpen", &pool_allocator_nointr, IPL_NONE);
307 pool_init(&pf_osfp_pl, sizeof(struct pf_os_fingerprint), 0, 0, 0,
308 "pfosfp", &pool_allocator_nointr, IPL_NONE);
309 #else
310 pool_init(&pf_osfp_entry_pl, sizeof(struct pf_osfp_entry), 0, 0, 0,
311 "pfosfpen", &pool_allocator_nointr);
312 pool_init(&pf_osfp_pl, sizeof(struct pf_os_fingerprint), 0, 0, 0,
313 "pfosfp", &pool_allocator_nointr);
314 #endif /* !__NetBSD__ */
315 SLIST_INIT(&pf_osfp_list);
316 }
317
318 /* Flush the fingerprint list */
319 void
320 pf_osfp_flush(void)
321 {
322 struct pf_os_fingerprint *fp;
323 struct pf_osfp_entry *entry;
324
325 while ((fp = SLIST_FIRST(&pf_osfp_list))) {
326 SLIST_REMOVE_HEAD(&pf_osfp_list, fp_next);
327 while ((entry = SLIST_FIRST(&fp->fp_oses))) {
328 SLIST_REMOVE_HEAD(&fp->fp_oses, fp_entry);
329 pool_put(&pf_osfp_entry_pl, entry);
330 }
331 pool_put(&pf_osfp_pl, fp);
332 }
333 }
334
335
336 /* Add a fingerprint */
337 int
338 pf_osfp_add(struct pf_osfp_ioctl *fpioc)
339 {
340 struct pf_os_fingerprint *fp, fpadd;
341 struct pf_osfp_entry *entry;
342
343 memset(&fpadd, 0, sizeof(fpadd));
344 fpadd.fp_tcpopts = fpioc->fp_tcpopts;
345 fpadd.fp_wsize = fpioc->fp_wsize;
346 fpadd.fp_psize = fpioc->fp_psize;
347 fpadd.fp_mss = fpioc->fp_mss;
348 fpadd.fp_flags = fpioc->fp_flags;
349 fpadd.fp_optcnt = fpioc->fp_optcnt;
350 fpadd.fp_wscale = fpioc->fp_wscale;
351 fpadd.fp_ttl = fpioc->fp_ttl;
352
353 DPFPRINTF("adding osfp %s %s %s = %s%d:%d:%d:%s%d:0x%llx %d "
354 "(TS=%s,M=%s%d,W=%s%d) %x\n",
355 fpioc->fp_os.fp_class_nm, fpioc->fp_os.fp_version_nm,
356 fpioc->fp_os.fp_subtype_nm,
357 (fpadd.fp_flags & PF_OSFP_WSIZE_MOD) ? "%" :
358 (fpadd.fp_flags & PF_OSFP_WSIZE_MSS) ? "S" :
359 (fpadd.fp_flags & PF_OSFP_WSIZE_MTU) ? "T" :
360 (fpadd.fp_flags & PF_OSFP_WSIZE_DC) ? "*" : "",
361 fpadd.fp_wsize,
362 fpadd.fp_ttl,
363 (fpadd.fp_flags & PF_OSFP_DF) ? 1 : 0,
364 (fpadd.fp_flags & PF_OSFP_PSIZE_MOD) ? "%" :
365 (fpadd.fp_flags & PF_OSFP_PSIZE_DC) ? "*" : "",
366 fpadd.fp_psize,
367 (long long int)fpadd.fp_tcpopts, fpadd.fp_optcnt,
368 (fpadd.fp_flags & PF_OSFP_TS0) ? "0" : "",
369 (fpadd.fp_flags & PF_OSFP_MSS_MOD) ? "%" :
370 (fpadd.fp_flags & PF_OSFP_MSS_DC) ? "*" : "",
371 fpadd.fp_mss,
372 (fpadd.fp_flags & PF_OSFP_WSCALE_MOD) ? "%" :
373 (fpadd.fp_flags & PF_OSFP_WSCALE_DC) ? "*" : "",
374 fpadd.fp_wscale,
375 fpioc->fp_os.fp_os);
376
377
378 if ((fp = pf_osfp_find_exact(&pf_osfp_list, &fpadd))) {
379 SLIST_FOREACH(entry, &fp->fp_oses, fp_entry) {
380 if (PF_OSFP_ENTRY_EQ(entry, &fpioc->fp_os))
381 return (EEXIST);
382 }
383 if ((entry = pool_get(&pf_osfp_entry_pl, PR_NOWAIT)) == NULL)
384 return (ENOMEM);
385 } else {
386 if ((fp = pool_get(&pf_osfp_pl, PR_NOWAIT)) == NULL)
387 return (ENOMEM);
388 memset(fp, 0, sizeof(*fp));
389 fp->fp_tcpopts = fpioc->fp_tcpopts;
390 fp->fp_wsize = fpioc->fp_wsize;
391 fp->fp_psize = fpioc->fp_psize;
392 fp->fp_mss = fpioc->fp_mss;
393 fp->fp_flags = fpioc->fp_flags;
394 fp->fp_optcnt = fpioc->fp_optcnt;
395 fp->fp_wscale = fpioc->fp_wscale;
396 fp->fp_ttl = fpioc->fp_ttl;
397 SLIST_INIT(&fp->fp_oses);
398 if ((entry = pool_get(&pf_osfp_entry_pl, PR_NOWAIT)) == NULL) {
399 pool_put(&pf_osfp_pl, fp);
400 return (ENOMEM);
401 }
402 pf_osfp_insert(&pf_osfp_list, fp);
403 }
404 memcpy(entry, &fpioc->fp_os, sizeof(*entry));
405
406 /* Make sure the strings are NUL terminated */
407 entry->fp_class_nm[sizeof(entry->fp_class_nm)-1] = '\0';
408 entry->fp_version_nm[sizeof(entry->fp_version_nm)-1] = '\0';
409 entry->fp_subtype_nm[sizeof(entry->fp_subtype_nm)-1] = '\0';
410
411 SLIST_INSERT_HEAD(&fp->fp_oses, entry, fp_entry);
412
413 #ifdef PFDEBUG
414 if ((fp = pf_osfp_validate()))
415 printf("Invalid fingerprint list\n");
416 #endif /* PFDEBUG */
417 return (0);
418 }
419
420
421 /* Find a fingerprint in the list */
422 struct pf_os_fingerprint *
423 pf_osfp_find(struct pf_osfp_list *list, struct pf_os_fingerprint *find,
424 u_int8_t ttldiff)
425 {
426 struct pf_os_fingerprint *f;
427
428 #define MATCH_INT(_MOD, _DC, _field) \
429 if ((f->fp_flags & _DC) == 0) { \
430 if ((f->fp_flags & _MOD) == 0) { \
431 if (f->_field != find->_field) \
432 continue; \
433 } else { \
434 if (f->_field == 0 || find->_field % f->_field) \
435 continue; \
436 } \
437 }
438
439 SLIST_FOREACH(f, list, fp_next) {
440 if (f->fp_tcpopts != find->fp_tcpopts ||
441 f->fp_optcnt != find->fp_optcnt ||
442 f->fp_ttl < find->fp_ttl ||
443 f->fp_ttl - find->fp_ttl > ttldiff ||
444 (f->fp_flags & (PF_OSFP_DF|PF_OSFP_TS0)) !=
445 (find->fp_flags & (PF_OSFP_DF|PF_OSFP_TS0)))
446 continue;
447
448 MATCH_INT(PF_OSFP_PSIZE_MOD, PF_OSFP_PSIZE_DC, fp_psize)
449 MATCH_INT(PF_OSFP_MSS_MOD, PF_OSFP_MSS_DC, fp_mss)
450 MATCH_INT(PF_OSFP_WSCALE_MOD, PF_OSFP_WSCALE_DC, fp_wscale)
451 if ((f->fp_flags & PF_OSFP_WSIZE_DC) == 0) {
452 if (f->fp_flags & PF_OSFP_WSIZE_MSS) {
453 if (find->fp_mss == 0)
454 continue;
455
456 /* Some "smart" NAT devices and DSL routers will tweak the MSS size and
457 * will set it to whatever is suitable for the link type.
458 */
459 #define SMART_MSS 1460
460 if ((find->fp_wsize % find->fp_mss ||
461 find->fp_wsize / find->fp_mss !=
462 f->fp_wsize) &&
463 (find->fp_wsize % SMART_MSS ||
464 find->fp_wsize / SMART_MSS !=
465 f->fp_wsize))
466 continue;
467 } else if (f->fp_flags & PF_OSFP_WSIZE_MTU) {
468 if (find->fp_mss == 0)
469 continue;
470
471 #define MTUOFF (sizeof(struct ip) + sizeof(struct tcphdr))
472 #define SMART_MTU (SMART_MSS + MTUOFF)
473 if ((find->fp_wsize % (find->fp_mss + MTUOFF) ||
474 find->fp_wsize / (find->fp_mss + MTUOFF) !=
475 f->fp_wsize) &&
476 (find->fp_wsize % SMART_MTU ||
477 find->fp_wsize / SMART_MTU !=
478 f->fp_wsize))
479 continue;
480 } else if (f->fp_flags & PF_OSFP_WSIZE_MOD) {
481 if (f->fp_wsize == 0 || find->fp_wsize %
482 f->fp_wsize)
483 continue;
484 } else {
485 if (f->fp_wsize != find->fp_wsize)
486 continue;
487 }
488 }
489 return (f);
490 }
491
492 return (NULL);
493 }
494
495 /* Find an exact fingerprint in the list */
496 struct pf_os_fingerprint *
497 pf_osfp_find_exact(struct pf_osfp_list *list, struct pf_os_fingerprint *find)
498 {
499 struct pf_os_fingerprint *f;
500
501 SLIST_FOREACH(f, list, fp_next) {
502 if (f->fp_tcpopts == find->fp_tcpopts &&
503 f->fp_wsize == find->fp_wsize &&
504 f->fp_psize == find->fp_psize &&
505 f->fp_mss == find->fp_mss &&
506 f->fp_flags == find->fp_flags &&
507 f->fp_optcnt == find->fp_optcnt &&
508 f->fp_wscale == find->fp_wscale &&
509 f->fp_ttl == find->fp_ttl)
510 return (f);
511 }
512
513 return (NULL);
514 }
515
516 /* Insert a fingerprint into the list */
517 void
518 pf_osfp_insert(struct pf_osfp_list *list, struct pf_os_fingerprint *ins)
519 {
520 struct pf_os_fingerprint *f, *prev = NULL;
521
522 /* XXX need to go semi tree based. can key on tcp options */
523
524 SLIST_FOREACH(f, list, fp_next)
525 prev = f;
526 if (prev)
527 SLIST_INSERT_AFTER(prev, ins, fp_next);
528 else
529 SLIST_INSERT_HEAD(list, ins, fp_next);
530 }
531
532 /* Fill a fingerprint by its number (from an ioctl) */
533 int
534 pf_osfp_get(struct pf_osfp_ioctl *fpioc)
535 {
536 struct pf_os_fingerprint *fp;
537 struct pf_osfp_entry *entry;
538 int num = fpioc->fp_getnum;
539 int i = 0;
540
541
542 memset(fpioc, 0, sizeof(*fpioc));
543 SLIST_FOREACH(fp, &pf_osfp_list, fp_next) {
544 SLIST_FOREACH(entry, &fp->fp_oses, fp_entry) {
545 if (i++ == num) {
546 fpioc->fp_mss = fp->fp_mss;
547 fpioc->fp_wsize = fp->fp_wsize;
548 fpioc->fp_flags = fp->fp_flags;
549 fpioc->fp_psize = fp->fp_psize;
550 fpioc->fp_ttl = fp->fp_ttl;
551 fpioc->fp_wscale = fp->fp_wscale;
552 fpioc->fp_getnum = num;
553 memcpy(&fpioc->fp_os, entry,
554 sizeof(fpioc->fp_os));
555 return (0);
556 }
557 }
558 }
559
560 return (EBUSY);
561 }
562
563
564 /* Validate that each signature is reachable */
565 struct pf_os_fingerprint *
566 pf_osfp_validate(void)
567 {
568 struct pf_os_fingerprint *f, *f2, find;
569
570 SLIST_FOREACH(f, &pf_osfp_list, fp_next) {
571 memcpy(&find, f, sizeof(find));
572
573 /* We do a few MSS/th_win percolations to make things unique */
574 if (find.fp_mss == 0)
575 find.fp_mss = 128;
576 if (f->fp_flags & PF_OSFP_WSIZE_MSS)
577 find.fp_wsize *= find.fp_mss, 1;
578 else if (f->fp_flags & PF_OSFP_WSIZE_MTU)
579 find.fp_wsize *= (find.fp_mss + 40);
580 else if (f->fp_flags & PF_OSFP_WSIZE_MOD)
581 find.fp_wsize *= 2;
582 if (f != (f2 = pf_osfp_find(&pf_osfp_list, &find, 0))) {
583 if (f2)
584 printf("Found \"%s %s %s\" instead of "
585 "\"%s %s %s\"\n",
586 SLIST_FIRST(&f2->fp_oses)->fp_class_nm,
587 SLIST_FIRST(&f2->fp_oses)->fp_version_nm,
588 SLIST_FIRST(&f2->fp_oses)->fp_subtype_nm,
589 SLIST_FIRST(&f->fp_oses)->fp_class_nm,
590 SLIST_FIRST(&f->fp_oses)->fp_version_nm,
591 SLIST_FIRST(&f->fp_oses)->fp_subtype_nm);
592 else
593 printf("Couldn't find \"%s %s %s\"\n",
594 SLIST_FIRST(&f->fp_oses)->fp_class_nm,
595 SLIST_FIRST(&f->fp_oses)->fp_version_nm,
596 SLIST_FIRST(&f->fp_oses)->fp_subtype_nm);
597 return (f);
598 }
599 }
600 return (NULL);
601 }
NetBSD on the FriendlyARM MINI2440