?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
route: Delete ortentry, SIOC{ADD,DEL}RT and RTM_OLD{ADD,DEL}
[dragonfly.git] / sys / net / pf / pf_osfp.c
blob56ba8872f51e988ec10d9a2e40d1472fb4e34a11
1 /* $OpenBSD: pf_osfp.c,v 1.15 2008/06/14 02:22:13 henning Exp $ */
2
3 /*
4 * Copyright (c) 2003 Mike Frantzen <frantzen@w4g.org>
5 *
6 * Permission to use, copy, modify, and distribute this software for any
7 * purpose with or without fee is hereby granted, provided that the above
8 * copyright notice and this permission notice appear in all copies.
9 *
10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17 *
18 */
19
20 #include <sys/param.h>
21 #include <sys/socket.h>
22 #ifdef _KERNEL
23 #include <sys/systm.h>
24 #endif /* _KERNEL */
25 #include <sys/mbuf.h>
26
27 #include <netinet/in.h>
28 #include <netinet/in_systm.h>
29 #include <netinet/ip.h>
30 #include <netinet/tcp.h>
31
32 #include <net/if.h>
33 #include <net/pf/pfvar.h>
34
35 #include <netinet/ip6.h>
36 #ifdef _KERNEL
37 #include <netinet6/in6_var.h>
38 #endif
39
40
41 #ifdef _KERNEL
42 # define DPFPRINTF(format, x...) \
43 if (pf_status.debug >= PF_DEBUG_NOISY) \
44 kprintf(format , ##x)
45
46 #else
47 /* Userland equivalents so we can lend code to tcpdump et al. */
48
49 # include <arpa/inet.h>
50 # include <errno.h>
51 # include <stdio.h>
52 # include <stdlib.h>
53 # include <string.h>
54 # include <netdb.h>
55
56 # ifdef PFDEBUG
57 # include <sys/stdarg.h>
58 # define DPFPRINTF(format, x...) fprintf(stderr, format , ##x)
59 # else
60 # define DPFPRINTF(format, x...) ((void)0)
61 # endif /* PFDEBUG */
62 #endif /* _KERNEL */
63
64 static MALLOC_DEFINE(M_PFOSFPENTRYPL, "pfospfen", "pf OS finger printing pool list");
65 static MALLOC_DEFINE(M_PFOSFPPL, "pfosfp", "pf OS finger printing pool list");
66
67 SLIST_HEAD(pf_osfp_list, pf_os_fingerprint) pf_osfp_list;
68
69 struct pf_os_fingerprint *pf_osfp_find(struct pf_osfp_list *,
70 struct pf_os_fingerprint *, u_int8_t);
71 struct pf_os_fingerprint *pf_osfp_find_exact(struct pf_osfp_list *,
72 struct pf_os_fingerprint *);
73 void pf_osfp_insert(struct pf_osfp_list *,
74 struct pf_os_fingerprint *);
75
76
77 #ifdef _KERNEL
78 /*
79 * Passively fingerprint the OS of the host (IPv4 TCP SYN packets only)
80 * Returns the list of possible OSes.
81 */
82 struct pf_osfp_enlist *
83 pf_osfp_fingerprint(struct pf_pdesc *pd, struct mbuf *m, int off,
84 const struct tcphdr *tcp)
85 {
86 struct ip *ip;
87 struct ip6_hdr *ip6;
88 char hdr[60];
89
90 if ((pd->af != PF_INET && pd->af != PF_INET6) ||
91 pd->proto != IPPROTO_TCP || (tcp->th_off << 2) < sizeof(*tcp))
92 return (NULL);
93
94 if (pd->af == PF_INET) {
95 ip = mtod(m, struct ip *);
96 ip6 = NULL;
97 } else {
98 ip = NULL;
99 ip6 = mtod(m, struct ip6_hdr *);
100 }
101 if (!pf_pull_hdr(m, off, hdr, tcp->th_off << 2, NULL, NULL,
102 pd->af)) return (NULL);
103
104 return (pf_osfp_fingerprint_hdr(ip, ip6, (struct tcphdr *)hdr));
105 }
106 #endif /* _KERNEL */
107
108 struct pf_osfp_enlist *
109 pf_osfp_fingerprint_hdr(const struct ip *ip, const struct ip6_hdr *ip6, const struct tcphdr *tcp)
110 {
111 struct pf_os_fingerprint fp, *fpresult;
112 int cnt, optlen = 0;
113 const u_int8_t *optp;
114 #ifdef _KERNEL
115 char srcname[128];
116 #else
117 char srcname[NI_MAXHOST];
118 #endif
119
120 if ((tcp->th_flags & (TH_SYN|TH_ACK)) != TH_SYN)
121 return (NULL);
122 if (ip) {
123 if ((ip->ip_off & IP_OFFMASK) != 0)
124 return (NULL);
125 }
126
127 memset(&fp, 0, sizeof(fp));
128
129 if (ip) {
130 #ifndef _KERNEL
131 struct sockaddr_in sin;
132 #endif
133
134 fp.fp_psize = ip->ip_len;
135 fp.fp_ttl = ip->ip_ttl;
136 if (ip->ip_off & IP_DF)
137 fp.fp_flags |= PF_OSFP_DF;
138 #ifdef _KERNEL
139 kinet_ntoa(ip->ip_src, srcname);
140 #else
141 memset(&sin, 0, sizeof(sin));
142 sin.sin_family = AF_INET;
143 sin.sin_len = sizeof(struct sockaddr_in);
144 sin.sin_addr = ip->ip_src;
145 (void)getnameinfo((struct sockaddr *)&sin,
146 sizeof(struct sockaddr_in), srcname, sizeof(srcname),
147 NULL, 0, NI_NUMERICHOST);
148 #endif
149 }
150 #ifdef INET6
151 else if (ip6) {
152 #ifndef _KERNEL
153 struct sockaddr_in6 sin6;
154 #endif
155
156 /* jumbo payload? */
157 fp.fp_psize = sizeof(struct ip6_hdr) + ntohs(ip6->ip6_plen);
158 fp.fp_ttl = ip6->ip6_hlim;
159 fp.fp_flags |= PF_OSFP_DF;
160 fp.fp_flags |= PF_OSFP_INET6;
161 #ifdef _KERNEL
162 strlcpy(srcname, ip6_sprintf((struct in6_addr *)&ip6->ip6_src),
163 sizeof(srcname));
164 #else
165 memset(&sin6, 0, sizeof(sin6));
166 sin6.sin6_family = AF_INET6;
167 sin6.sin6_len = sizeof(struct sockaddr_in6);
168 sin6.sin6_addr = ip6->ip6_src;
169 (void)getnameinfo((struct sockaddr *)&sin6,
170 sizeof(struct sockaddr_in6), srcname, sizeof(srcname),
171 NULL, 0, NI_NUMERICHOST);
172 #endif
173 }
174 #endif
175 else
176 return (NULL);
177 fp.fp_wsize = ntohs(tcp->th_win);
178
179
180 cnt = (tcp->th_off << 2) - sizeof(*tcp);
181 optp = (const u_int8_t *)((const char *)tcp + sizeof(*tcp));
182 for (; cnt > 0; cnt -= optlen, optp += optlen) {
183 if (*optp == TCPOPT_EOL)
184 break;
185
186 fp.fp_optcnt++;
187 if (*optp == TCPOPT_NOP) {
188 fp.fp_tcpopts = (fp.fp_tcpopts << PF_OSFP_TCPOPT_BITS) |
189 PF_OSFP_TCPOPT_NOP;
190 optlen = 1;
191 } else {
192 if (cnt < 2)
193 return (NULL);
194 optlen = optp[1];
195 if (optlen > cnt || optlen < 2)
196 return (NULL);
197 switch (*optp) {
198 case TCPOPT_MAXSEG:
199 if (optlen >= TCPOLEN_MAXSEG)
200 memcpy(&fp.fp_mss, &optp[2],
201 sizeof(fp.fp_mss));
202 fp.fp_tcpopts = (fp.fp_tcpopts <<
203 PF_OSFP_TCPOPT_BITS) | PF_OSFP_TCPOPT_MSS;
204 fp.fp_mss = ntohs(fp.fp_mss);
205 break;
206 case TCPOPT_WINDOW:
207 if (optlen >= TCPOLEN_WINDOW)
208 memcpy(&fp.fp_wscale, &optp[2],
209 sizeof(fp.fp_wscale));
210 fp.fp_tcpopts = (fp.fp_tcpopts <<
211 PF_OSFP_TCPOPT_BITS) |
212 PF_OSFP_TCPOPT_WSCALE;
213 break;
214 case TCPOPT_SACK_PERMITTED:
215 fp.fp_tcpopts = (fp.fp_tcpopts <<
216 PF_OSFP_TCPOPT_BITS) | PF_OSFP_TCPOPT_SACK;
217 break;
218 case TCPOPT_TIMESTAMP:
219 if (optlen >= TCPOLEN_TIMESTAMP) {
220 u_int32_t ts;
221 memcpy(&ts, &optp[2], sizeof(ts));
222 if (ts == 0)
223 fp.fp_flags |= PF_OSFP_TS0;
224
225 }
226 fp.fp_tcpopts = (fp.fp_tcpopts <<
227 PF_OSFP_TCPOPT_BITS) | PF_OSFP_TCPOPT_TS;
228 break;
229 default:
230 return (NULL);
231 }
232 }
233 optlen = MAX(optlen, 1); /* paranoia */
234 }
235
236 DPFPRINTF("fingerprinted %s:%d %d:%d:%d:%d:%llx (%d) "
237 "(TS=%s,M=%s%d,W=%s%d)\n",
238 srcname, ntohs(tcp->th_sport),
239 fp.fp_wsize, fp.fp_ttl, (fp.fp_flags & PF_OSFP_DF) != 0,
240 fp.fp_psize, (long long int)fp.fp_tcpopts, fp.fp_optcnt,
241 (fp.fp_flags & PF_OSFP_TS0) ? "0" : "",
242 (fp.fp_flags & PF_OSFP_MSS_MOD) ? "%" :
243 (fp.fp_flags & PF_OSFP_MSS_DC) ? "*" : "",
244 fp.fp_mss,
245 (fp.fp_flags & PF_OSFP_WSCALE_MOD) ? "%" :
246 (fp.fp_flags & PF_OSFP_WSCALE_DC) ? "*" : "",
247 fp.fp_wscale);
248
249 if ((fpresult = pf_osfp_find(&pf_osfp_list, &fp,
250 PF_OSFP_MAXTTL_OFFSET)))
251 return (&fpresult->fp_oses);
252 return (NULL);
253 }
254
255 /* Match a fingerprint ID against a list of OSes */
256 int
257 pf_osfp_match(struct pf_osfp_enlist *list, pf_osfp_t os)
258 {
259 struct pf_osfp_entry *entry;
260 int os_class, os_version, os_subtype;
261 int en_class, en_version, en_subtype;
262
263 if (os == PF_OSFP_ANY)
264 return (1);
265 if (list == NULL) {
266 DPFPRINTF("osfp no match against %x\n", os);
267 return (os == PF_OSFP_UNKNOWN);
268 }
269 PF_OSFP_UNPACK(os, os_class, os_version, os_subtype);
270 SLIST_FOREACH(entry, list, fp_entry) {
271 PF_OSFP_UNPACK(entry->fp_os, en_class, en_version, en_subtype);
272 if ((os_class == PF_OSFP_ANY || en_class == os_class) &&
273 (os_version == PF_OSFP_ANY || en_version == os_version) &&
274 (os_subtype == PF_OSFP_ANY || en_subtype == os_subtype)) {
275 DPFPRINTF("osfp matched %s %s %s %x==%x\n",
276 entry->fp_class_nm, entry->fp_version_nm,
277 entry->fp_subtype_nm, os, entry->fp_os);
278 return (1);
279 }
280 }
281 DPFPRINTF("fingerprint 0x%x didn't match\n", os);
282 return (0);
283 }
284
285 /* Initialize the OS fingerprint system */
286 void
287 pf_osfp_initialize(void)
288 {
289 SLIST_INIT(&pf_osfp_list);
290 }
291
292 /* Flush the fingerprint list */
293 void
294 pf_osfp_flush(void)
295 {
296 struct pf_os_fingerprint *fp;
297 struct pf_osfp_entry *entry;
298
299 while ((fp = SLIST_FIRST(&pf_osfp_list))) {
300 SLIST_REMOVE_HEAD(&pf_osfp_list, fp_next);
301 while ((entry = SLIST_FIRST(&fp->fp_oses))) {
302 SLIST_REMOVE_HEAD(&fp->fp_oses, fp_entry);
303 kfree(entry, M_PFOSFPENTRYPL);
304 }
305 kfree(fp, M_PFOSFPPL);
306 }
307 }
308
309
310 /* Add a fingerprint */
311 int
312 pf_osfp_add(struct pf_osfp_ioctl *fpioc)
313 {
314 struct pf_os_fingerprint *fp, fpadd;
315 struct pf_osfp_entry *entry;
316
317 memset(&fpadd, 0, sizeof(fpadd));
318 fpadd.fp_tcpopts = fpioc->fp_tcpopts;
319 fpadd.fp_wsize = fpioc->fp_wsize;
320 fpadd.fp_psize = fpioc->fp_psize;
321 fpadd.fp_mss = fpioc->fp_mss;
322 fpadd.fp_flags = fpioc->fp_flags;
323 fpadd.fp_optcnt = fpioc->fp_optcnt;
324 fpadd.fp_wscale = fpioc->fp_wscale;
325 fpadd.fp_ttl = fpioc->fp_ttl;
326
327 #if 0 /* XXX RYAN wants to fix logging */
328 DPFPRINTF("adding osfp %s %s %s = %s%d:%d:%d:%s%d:0x%llx %d "
329 "(TS=%s,M=%s%d,W=%s%d) %x\n",
330 fpioc->fp_os.fp_class_nm, fpioc->fp_os.fp_version_nm,
331 fpioc->fp_os.fp_subtype_nm,
332 (fpadd.fp_flags & PF_OSFP_WSIZE_MOD) ? "%" :
333 (fpadd.fp_flags & PF_OSFP_WSIZE_MSS) ? "S" :
334 (fpadd.fp_flags & PF_OSFP_WSIZE_MTU) ? "T" :
335 (fpadd.fp_flags & PF_OSFP_WSIZE_DC) ? "*" : "",
336 fpadd.fp_wsize,
337 fpadd.fp_ttl,
338 (fpadd.fp_flags & PF_OSFP_DF) ? 1 : 0,
339 (fpadd.fp_flags & PF_OSFP_PSIZE_MOD) ? "%" :
340 (fpadd.fp_flags & PF_OSFP_PSIZE_DC) ? "*" : "",
341 fpadd.fp_psize,
342 (long long int)fpadd.fp_tcpopts, fpadd.fp_optcnt,
343 (fpadd.fp_flags & PF_OSFP_TS0) ? "0" : "",
344 (fpadd.fp_flags & PF_OSFP_MSS_MOD) ? "%" :
345 (fpadd.fp_flags & PF_OSFP_MSS_DC) ? "*" : "",
346 fpadd.fp_mss,
347 (fpadd.fp_flags & PF_OSFP_WSCALE_MOD) ? "%" :
348 (fpadd.fp_flags & PF_OSFP_WSCALE_DC) ? "*" : "",
349 fpadd.fp_wscale,
350 fpioc->fp_os.fp_os);
351 #endif
352
353 if ((fp = pf_osfp_find_exact(&pf_osfp_list, &fpadd))) {
354 SLIST_FOREACH(entry, &fp->fp_oses, fp_entry) {
355 if (PF_OSFP_ENTRY_EQ(entry, &fpioc->fp_os))
356 return (EEXIST);
357 }
358 if ((entry = kmalloc(sizeof(struct pf_osfp_entry),
359 M_PFOSFPENTRYPL, M_WAITOK|M_NULLOK)) == NULL)
360 return (ENOMEM);
361 } else {
362 if ((fp = kmalloc(sizeof(struct pf_os_fingerprint),
363 M_PFOSFPPL, M_WAITOK|M_NULLOK)) == NULL)
364 return (ENOMEM);
365 memset(fp, 0, sizeof(*fp));
366 fp->fp_tcpopts = fpioc->fp_tcpopts;
367 fp->fp_wsize = fpioc->fp_wsize;
368 fp->fp_psize = fpioc->fp_psize;
369 fp->fp_mss = fpioc->fp_mss;
370 fp->fp_flags = fpioc->fp_flags;
371 fp->fp_optcnt = fpioc->fp_optcnt;
372 fp->fp_wscale = fpioc->fp_wscale;
373 fp->fp_ttl = fpioc->fp_ttl;
374 SLIST_INIT(&fp->fp_oses);
375 if ((entry = kmalloc(sizeof(struct pf_osfp_entry),
376 M_PFOSFPENTRYPL, M_WAITOK|M_NULLOK)) == NULL) {
377 kfree(fp, M_PFOSFPPL);
378 return (ENOMEM);
379 }
380 pf_osfp_insert(&pf_osfp_list, fp);
381 }
382 memcpy(entry, &fpioc->fp_os, sizeof(*entry));
383
384 /* Make sure the strings are NUL terminated */
385 entry->fp_class_nm[sizeof(entry->fp_class_nm)-1] = '\0';
386 entry->fp_version_nm[sizeof(entry->fp_version_nm)-1] = '\0';
387 entry->fp_subtype_nm[sizeof(entry->fp_subtype_nm)-1] = '\0';
388
389 SLIST_INSERT_HEAD(&fp->fp_oses, entry, fp_entry);
390
391 #ifdef PFDEBUG
392 if ((fp = pf_osfp_validate()))
393 kprintf("Invalid fingerprint list\n");
394 #endif /* PFDEBUG */
395 return (0);
396 }
397
398
399 /* Find a fingerprint in the list */
400 struct pf_os_fingerprint *
401 pf_osfp_find(struct pf_osfp_list *list, struct pf_os_fingerprint *find,
402 u_int8_t ttldiff)
403 {
404 struct pf_os_fingerprint *f;
405
406 #define MATCH_INT(_MOD, _DC, _field) \
407 if ((f->fp_flags & _DC) == 0) { \
408 if ((f->fp_flags & _MOD) == 0) { \
409 if (f->_field != find->_field) \
410 continue; \
411 } else { \
412 if (f->_field == 0 || find->_field % f->_field) \
413 continue; \
414 } \
415 }
416
417 SLIST_FOREACH(f, list, fp_next) {
418 if (f->fp_tcpopts != find->fp_tcpopts ||
419 f->fp_optcnt != find->fp_optcnt ||
420 f->fp_ttl < find->fp_ttl ||
421 f->fp_ttl - find->fp_ttl > ttldiff ||
422 (f->fp_flags & (PF_OSFP_DF|PF_OSFP_TS0)) !=
423 (find->fp_flags & (PF_OSFP_DF|PF_OSFP_TS0)))
424 continue;
425
426 MATCH_INT(PF_OSFP_PSIZE_MOD, PF_OSFP_PSIZE_DC, fp_psize)
427 MATCH_INT(PF_OSFP_MSS_MOD, PF_OSFP_MSS_DC, fp_mss)
428 MATCH_INT(PF_OSFP_WSCALE_MOD, PF_OSFP_WSCALE_DC, fp_wscale)
429 if ((f->fp_flags & PF_OSFP_WSIZE_DC) == 0) {
430 if (f->fp_flags & PF_OSFP_WSIZE_MSS) {
431 if (find->fp_mss == 0)
432 continue;
433
434 /* Some "smart" NAT devices and DSL routers will tweak the MSS size and
435 * will set it to whatever is suitable for the link type.
436 */
437 #define SMART_MSS 1460
438 if ((find->fp_wsize % find->fp_mss ||
439 find->fp_wsize / find->fp_mss !=
440 f->fp_wsize) &&
441 (find->fp_wsize % SMART_MSS ||
442 find->fp_wsize / SMART_MSS !=
443 f->fp_wsize))
444 continue;
445 } else if (f->fp_flags & PF_OSFP_WSIZE_MTU) {
446 if (find->fp_mss == 0)
447 continue;
448
449 #define MTUOFF (sizeof(struct ip) + sizeof(struct tcphdr))
450 #define SMART_MTU (SMART_MSS + MTUOFF)
451 if ((find->fp_wsize % (find->fp_mss + MTUOFF) ||
452 find->fp_wsize / (find->fp_mss + MTUOFF) !=
453 f->fp_wsize) &&
454 (find->fp_wsize % SMART_MTU ||
455 find->fp_wsize / SMART_MTU !=
456 f->fp_wsize))
457 continue;
458 } else if (f->fp_flags & PF_OSFP_WSIZE_MOD) {
459 if (f->fp_wsize == 0 || find->fp_wsize %
460 f->fp_wsize)
461 continue;
462 } else {
463 if (f->fp_wsize != find->fp_wsize)
464 continue;
465 }
466 }
467 return (f);
468 }
469
470 return (NULL);
471 }
472
473 /* Find an exact fingerprint in the list */
474 struct pf_os_fingerprint *
475 pf_osfp_find_exact(struct pf_osfp_list *list, struct pf_os_fingerprint *find)
476 {
477 struct pf_os_fingerprint *f;
478
479 SLIST_FOREACH(f, list, fp_next) {
480 if (f->fp_tcpopts == find->fp_tcpopts &&
481 f->fp_wsize == find->fp_wsize &&
482 f->fp_psize == find->fp_psize &&
483 f->fp_mss == find->fp_mss &&
484 f->fp_flags == find->fp_flags &&
485 f->fp_optcnt == find->fp_optcnt &&
486 f->fp_wscale == find->fp_wscale &&
487 f->fp_ttl == find->fp_ttl)
488 return (f);
489 }
490
491 return (NULL);
492 }
493
494 /* Insert a fingerprint into the list */
495 void
496 pf_osfp_insert(struct pf_osfp_list *list, struct pf_os_fingerprint *ins)
497 {
498 struct pf_os_fingerprint *f, *prev = NULL;
499
500 /* XXX need to go semi tree based. can key on tcp options */
501
502 SLIST_FOREACH(f, list, fp_next)
503 prev = f;
504 if (prev)
505 SLIST_INSERT_AFTER(prev, ins, fp_next);
506 else
507 SLIST_INSERT_HEAD(list, ins, fp_next);
508 }
509
510 /* Fill a fingerprint by its number (from an ioctl) */
511 int
512 pf_osfp_get(struct pf_osfp_ioctl *fpioc)
513 {
514 struct pf_os_fingerprint *fp;
515 struct pf_osfp_entry *entry;
516 int num = fpioc->fp_getnum;
517 int i = 0;
518
519
520 memset(fpioc, 0, sizeof(*fpioc));
521 SLIST_FOREACH(fp, &pf_osfp_list, fp_next) {
522 SLIST_FOREACH(entry, &fp->fp_oses, fp_entry) {
523 if (i++ == num) {
524 fpioc->fp_mss = fp->fp_mss;
525 fpioc->fp_wsize = fp->fp_wsize;
526 fpioc->fp_flags = fp->fp_flags;
527 fpioc->fp_psize = fp->fp_psize;
528 fpioc->fp_ttl = fp->fp_ttl;
529 fpioc->fp_wscale = fp->fp_wscale;
530 fpioc->fp_getnum = num;
531 memcpy(&fpioc->fp_os, entry,
532 sizeof(fpioc->fp_os));
533 return (0);
534 }
535 }
536 }
537
538 return (EBUSY);
539 }
540
541
542 /* Validate that each signature is reachable */
543 struct pf_os_fingerprint *
544 pf_osfp_validate(void)
545 {
546 struct pf_os_fingerprint *f, *f2, find;
547
548 SLIST_FOREACH(f, &pf_osfp_list, fp_next) {
549 memcpy(&find, f, sizeof(find));
550
551 /* We do a few MSS/th_win percolations to make things unique */
552 if (find.fp_mss == 0)
553 find.fp_mss = 128;
554 if (f->fp_flags & PF_OSFP_WSIZE_MSS)
555 find.fp_wsize *= find.fp_mss;
556 else if (f->fp_flags & PF_OSFP_WSIZE_MTU)
557 find.fp_wsize *= (find.fp_mss + 40);
558 else if (f->fp_flags & PF_OSFP_WSIZE_MOD)
559 find.fp_wsize *= 2;
560 if (f != (f2 = pf_osfp_find(&pf_osfp_list, &find, 0))) {
561 if (f2)
562 kprintf("Found \"%s %s %s\" instead of "
563 "\"%s %s %s\"\n",
564 SLIST_FIRST(&f2->fp_oses)->fp_class_nm,
565 SLIST_FIRST(&f2->fp_oses)->fp_version_nm,
566 SLIST_FIRST(&f2->fp_oses)->fp_subtype_nm,
567 SLIST_FIRST(&f->fp_oses)->fp_class_nm,
568 SLIST_FIRST(&f->fp_oses)->fp_version_nm,
569 SLIST_FIRST(&f->fp_oses)->fp_subtype_nm);
570 else
571 kprintf("Couldn't find \"%s %s %s\"\n",
572 SLIST_FIRST(&f->fp_oses)->fp_class_nm,
573 SLIST_FIRST(&f->fp_oses)->fp_version_nm,
574 SLIST_FIRST(&f->fp_oses)->fp_subtype_nm);
575 return (f);
576 }
577 }
578 return (NULL);
579 }
DragonFly BSD