1 /* $OpenBSD: pf_osfp.c,v 1.26 2011/09/28 17:15:45 bluhm 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 #include <sys/pool.h> 25 #endif /* _KERNEL */ 26 #include <sys/mbuf.h> 27 #include <sys/syslog.h> 28 29 #include <netinet/in.h> 30 #include <netinet/in_systm.h> 31 #include <netinet/ip.h> 32 #include <netinet/tcp.h> 33 34 #include <net/if.h> 35 #include <net/pfvar.h> 36 37 #include <netinet/ip6.h> 38 #ifdef _KERNEL 39 #include <netinet6/in6_var.h> 40 #endif 41 42 43 #ifdef _KERNEL 44 typedef struct pool pool_t; 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 # define pool_t int 56 # define pool_get(pool, flags) malloc(*(pool)) 57 # define pool_put(pool, item) free(item) 58 # define pool_init(pool, size, a, ao, f, m, p) (*(pool)) = (size) 59 60 # ifdef PFDEBUG 61 # include <sys/stdarg.h> /* for DPFPRINTF() */ 62 # endif /* PFDEBUG */ 63 64 #endif /* _KERNEL */ 65 66 67 SLIST_HEAD(pf_osfp_list, pf_os_fingerprint) pf_osfp_list; 68 pool_t pf_osfp_entry_pl; 69 pool_t pf_osfp_pl; 70 71 struct pf_os_fingerprint *pf_osfp_find(struct pf_osfp_list *, 72 struct pf_os_fingerprint *, u_int8_t); 73 struct pf_os_fingerprint *pf_osfp_find_exact(struct pf_osfp_list *, 74 struct pf_os_fingerprint *); 75 void pf_osfp_insert(struct pf_osfp_list *, 76 struct pf_os_fingerprint *); 77 78 79 #ifdef _KERNEL 80 /* 81 * Passively fingerprint the OS of the host (IPv4 TCP SYN packets only) 82 * Returns the list of possible OSes. 83 */ 84 struct pf_osfp_enlist * 85 pf_osfp_fingerprint(struct pf_pdesc *pd) 86 { 87 struct tcphdr *th = pd->hdr.tcp; 88 struct ip *ip = NULL; 89 struct ip6_hdr *ip6 = NULL; 90 char hdr[60]; 91 92 if (pd->proto != IPPROTO_TCP) 93 return (NULL); 94 95 switch (pd->af) { 96 case AF_INET: 97 ip = mtod(pd->m, struct ip *); 98 break; 99 case AF_INET6: 100 ip6 = mtod(pd->m, struct ip6_hdr *); 101 break; 102 } 103 if (!pf_pull_hdr(pd->m, pd->off, hdr, th->th_off << 2, NULL, NULL, 104 pd->af)) 105 return (NULL); 106 107 return (pf_osfp_fingerprint_hdr(ip, ip6, (struct tcphdr *)hdr)); 108 } 109 #endif /* _KERNEL */ 110 111 struct pf_osfp_enlist * 112 pf_osfp_fingerprint_hdr(const struct ip *ip, const struct ip6_hdr *ip6, 113 const struct tcphdr *tcp) 114 { 115 struct pf_os_fingerprint fp, *fpresult; 116 int cnt, optlen = 0; 117 const u_int8_t *optp; 118 #ifdef _KERNEL 119 char srcname[128]; 120 #else 121 char srcname[NI_MAXHOST]; 122 #endif 123 124 if ((tcp->th_flags & (TH_SYN|TH_ACK)) != TH_SYN) 125 return (NULL); 126 if (ip) { 127 if ((ip->ip_off & htons(IP_OFFMASK)) != 0) 128 return (NULL); 129 } 130 131 memset(&fp, 0, sizeof(fp)); 132 133 if (ip) { 134 #ifndef _KERNEL 135 struct sockaddr_in sin; 136 #endif 137 138 fp.fp_psize = ntohs(ip->ip_len); 139 fp.fp_ttl = ip->ip_ttl; 140 if (ip->ip_off & htons(IP_DF)) 141 fp.fp_flags |= PF_OSFP_DF; 142 #ifdef _KERNEL 143 strlcpy(srcname, inet_ntoa(ip->ip_src), sizeof(srcname)); 144 #else 145 memset(&sin, 0, sizeof(sin)); 146 sin.sin_family = AF_INET; 147 sin.sin_len = sizeof(struct sockaddr_in); 148 sin.sin_addr = ip->ip_src; 149 (void)getnameinfo((struct sockaddr *)&sin, 150 sizeof(struct sockaddr_in), srcname, sizeof(srcname), 151 NULL, 0, NI_NUMERICHOST); 152 #endif 153 } 154 #ifdef INET6 155 else if (ip6) { 156 #ifndef _KERNEL 157 struct sockaddr_in6 sin6; 158 #endif 159 160 /* jumbo payload? */ 161 fp.fp_psize = sizeof(struct ip6_hdr) + ntohs(ip6->ip6_plen); 162 fp.fp_ttl = ip6->ip6_hlim; 163 fp.fp_flags |= PF_OSFP_DF; 164 fp.fp_flags |= PF_OSFP_INET6; 165 #ifdef _KERNEL 166 strlcpy(srcname, ip6_sprintf((struct in6_addr *)&ip6->ip6_src), 167 sizeof(srcname)); 168 #else 169 memset(&sin6, 0, sizeof(sin6)); 170 sin6.sin6_family = AF_INET6; 171 sin6.sin6_len = sizeof(struct sockaddr_in6); 172 sin6.sin6_addr = ip6->ip6_src; 173 (void)getnameinfo((struct sockaddr *)&sin6, 174 sizeof(struct sockaddr_in6), srcname, sizeof(srcname), 175 NULL, 0, NI_NUMERICHOST); 176 #endif 177 } 178 #endif 179 else 180 return (NULL); 181 fp.fp_wsize = ntohs(tcp->th_win); 182 183 184 cnt = (tcp->th_off << 2) - sizeof(*tcp); 185 optp = (const u_int8_t *)((const char *)tcp + sizeof(*tcp)); 186 for (; cnt > 0; cnt -= optlen, optp += optlen) { 187 if (*optp == TCPOPT_EOL) 188 break; 189 190 fp.fp_optcnt++; 191 if (*optp == TCPOPT_NOP) { 192 fp.fp_tcpopts = (fp.fp_tcpopts << PF_OSFP_TCPOPT_BITS) | 193 PF_OSFP_TCPOPT_NOP; 194 optlen = 1; 195 } else { 196 if (cnt < 2) 197 return (NULL); 198 optlen = optp[1]; 199 if (optlen > cnt || optlen < 2) 200 return (NULL); 201 switch (*optp) { 202 case TCPOPT_MAXSEG: 203 if (optlen >= TCPOLEN_MAXSEG) 204 memcpy(&fp.fp_mss, &optp[2], 205 sizeof(fp.fp_mss)); 206 fp.fp_tcpopts = (fp.fp_tcpopts << 207 PF_OSFP_TCPOPT_BITS) | PF_OSFP_TCPOPT_MSS; 208 NTOHS(fp.fp_mss); 209 break; 210 case TCPOPT_WINDOW: 211 if (optlen >= TCPOLEN_WINDOW) 212 memcpy(&fp.fp_wscale, &optp[2], 213 sizeof(fp.fp_wscale)); 214 fp.fp_tcpopts = (fp.fp_tcpopts << 215 PF_OSFP_TCPOPT_BITS) | 216 PF_OSFP_TCPOPT_WSCALE; 217 break; 218 case TCPOPT_SACK_PERMITTED: 219 fp.fp_tcpopts = (fp.fp_tcpopts << 220 PF_OSFP_TCPOPT_BITS) | PF_OSFP_TCPOPT_SACK; 221 break; 222 case TCPOPT_TIMESTAMP: 223 if (optlen >= TCPOLEN_TIMESTAMP) { 224 u_int32_t ts; 225 memcpy(&ts, &optp[2], sizeof(ts)); 226 if (ts == 0) 227 fp.fp_flags |= PF_OSFP_TS0; 228 229 } 230 fp.fp_tcpopts = (fp.fp_tcpopts << 231 PF_OSFP_TCPOPT_BITS) | PF_OSFP_TCPOPT_TS; 232 break; 233 default: 234 return (NULL); 235 } 236 } 237 optlen = MAX(optlen, 1); /* paranoia */ 238 } 239 240 DPFPRINTF(LOG_NOTICE, 241 "fingerprinted %s:%d %d:%d:%d:%d:%llx (%d) " 242 "(TS=%s,M=%s%d,W=%s%d)", 243 srcname, ntohs(tcp->th_sport), 244 fp.fp_wsize, fp.fp_ttl, (fp.fp_flags & PF_OSFP_DF) != 0, 245 fp.fp_psize, (long long int)fp.fp_tcpopts, fp.fp_optcnt, 246 (fp.fp_flags & PF_OSFP_TS0) ? "0" : "", 247 (fp.fp_flags & PF_OSFP_MSS_MOD) ? "%" : 248 (fp.fp_flags & PF_OSFP_MSS_DC) ? "*" : "", 249 fp.fp_mss, 250 (fp.fp_flags & PF_OSFP_WSCALE_MOD) ? "%" : 251 (fp.fp_flags & PF_OSFP_WSCALE_DC) ? "*" : "", 252 fp.fp_wscale); 253 254 if ((fpresult = pf_osfp_find(&pf_osfp_list, &fp, 255 PF_OSFP_MAXTTL_OFFSET))) 256 return (&fpresult->fp_oses); 257 return (NULL); 258 } 259 260 /* Match a fingerprint ID against a list of OSes */ 261 int 262 pf_osfp_match(struct pf_osfp_enlist *list, pf_osfp_t os) 263 { 264 struct pf_osfp_entry *entry; 265 int os_class, os_version, os_subtype; 266 int en_class, en_version, en_subtype; 267 268 if (os == PF_OSFP_ANY) 269 return (1); 270 if (list == NULL) { 271 DPFPRINTF(LOG_NOTICE, "osfp no match against %x", os); 272 return (os == PF_OSFP_UNKNOWN); 273 } 274 PF_OSFP_UNPACK(os, os_class, os_version, os_subtype); 275 SLIST_FOREACH(entry, list, fp_entry) { 276 PF_OSFP_UNPACK(entry->fp_os, en_class, en_version, en_subtype); 277 if ((os_class == PF_OSFP_ANY || en_class == os_class) && 278 (os_version == PF_OSFP_ANY || en_version == os_version) && 279 (os_subtype == PF_OSFP_ANY || en_subtype == os_subtype)) { 280 DPFPRINTF(LOG_NOTICE, 281 "osfp matched %s %s %s %x==%x", 282 entry->fp_class_nm, entry->fp_version_nm, 283 entry->fp_subtype_nm, os, entry->fp_os); 284 return (1); 285 } 286 } 287 DPFPRINTF(LOG_NOTICE, "fingerprint 0x%x didn't match", os); 288 return (0); 289 } 290 291 /* Initialize the OS fingerprint system */ 292 void 293 pf_osfp_initialize(void) 294 { 295 pool_init(&pf_osfp_entry_pl, sizeof(struct pf_osfp_entry), 0, 0, 0, 296 "pfosfpen", &pool_allocator_nointr); 297 pool_init(&pf_osfp_pl, sizeof(struct pf_os_fingerprint), 0, 0, 0, 298 "pfosfp", &pool_allocator_nointr); 299 SLIST_INIT(&pf_osfp_list); 300 } 301 302 /* Flush the fingerprint list */ 303 void 304 pf_osfp_flush(void) 305 { 306 struct pf_os_fingerprint *fp; 307 struct pf_osfp_entry *entry; 308 309 while ((fp = SLIST_FIRST(&pf_osfp_list))) { 310 SLIST_REMOVE_HEAD(&pf_osfp_list, fp_next); 311 while ((entry = SLIST_FIRST(&fp->fp_oses))) { 312 SLIST_REMOVE_HEAD(&fp->fp_oses, fp_entry); 313 pool_put(&pf_osfp_entry_pl, entry); 314 } 315 pool_put(&pf_osfp_pl, fp); 316 } 317 } 318 319 320 /* Add a fingerprint */ 321 int 322 pf_osfp_add(struct pf_osfp_ioctl *fpioc) 323 { 324 struct pf_os_fingerprint *fp, fpadd; 325 struct pf_osfp_entry *entry; 326 327 memset(&fpadd, 0, sizeof(fpadd)); 328 fpadd.fp_tcpopts = fpioc->fp_tcpopts; 329 fpadd.fp_wsize = fpioc->fp_wsize; 330 fpadd.fp_psize = fpioc->fp_psize; 331 fpadd.fp_mss = fpioc->fp_mss; 332 fpadd.fp_flags = fpioc->fp_flags; 333 fpadd.fp_optcnt = fpioc->fp_optcnt; 334 fpadd.fp_wscale = fpioc->fp_wscale; 335 fpadd.fp_ttl = fpioc->fp_ttl; 336 337 DPFPRINTF(LOG_DEBUG, 338 "adding osfp %s %s %s = %s%d:%d:%d:%s%d:0x%llx %d " 339 "(TS=%s,M=%s%d,W=%s%d) %x", 340 fpioc->fp_os.fp_class_nm, fpioc->fp_os.fp_version_nm, 341 fpioc->fp_os.fp_subtype_nm, 342 (fpadd.fp_flags & PF_OSFP_WSIZE_MOD) ? "%" : 343 (fpadd.fp_flags & PF_OSFP_WSIZE_MSS) ? "S" : 344 (fpadd.fp_flags & PF_OSFP_WSIZE_MTU) ? "T" : 345 (fpadd.fp_flags & PF_OSFP_WSIZE_DC) ? "*" : "", 346 fpadd.fp_wsize, 347 fpadd.fp_ttl, 348 (fpadd.fp_flags & PF_OSFP_DF) ? 1 : 0, 349 (fpadd.fp_flags & PF_OSFP_PSIZE_MOD) ? "%" : 350 (fpadd.fp_flags & PF_OSFP_PSIZE_DC) ? "*" : "", 351 fpadd.fp_psize, 352 (long long int)fpadd.fp_tcpopts, fpadd.fp_optcnt, 353 (fpadd.fp_flags & PF_OSFP_TS0) ? "0" : "", 354 (fpadd.fp_flags & PF_OSFP_MSS_MOD) ? "%" : 355 (fpadd.fp_flags & PF_OSFP_MSS_DC) ? "*" : "", 356 fpadd.fp_mss, 357 (fpadd.fp_flags & PF_OSFP_WSCALE_MOD) ? "%" : 358 (fpadd.fp_flags & PF_OSFP_WSCALE_DC) ? "*" : "", 359 fpadd.fp_wscale, 360 fpioc->fp_os.fp_os); 361 362 if ((fp = pf_osfp_find_exact(&pf_osfp_list, &fpadd))) { 363 SLIST_FOREACH(entry, &fp->fp_oses, fp_entry) { 364 if (PF_OSFP_ENTRY_EQ(entry, &fpioc->fp_os)) 365 return (EEXIST); 366 } 367 if ((entry = pool_get(&pf_osfp_entry_pl, 368 PR_WAITOK|PR_LIMITFAIL)) == NULL) 369 return (ENOMEM); 370 } else { 371 if ((fp = pool_get(&pf_osfp_pl, 372 PR_WAITOK|PR_ZERO|PR_LIMITFAIL)) == NULL) 373 return (ENOMEM); 374 fp->fp_tcpopts = fpioc->fp_tcpopts; 375 fp->fp_wsize = fpioc->fp_wsize; 376 fp->fp_psize = fpioc->fp_psize; 377 fp->fp_mss = fpioc->fp_mss; 378 fp->fp_flags = fpioc->fp_flags; 379 fp->fp_optcnt = fpioc->fp_optcnt; 380 fp->fp_wscale = fpioc->fp_wscale; 381 fp->fp_ttl = fpioc->fp_ttl; 382 SLIST_INIT(&fp->fp_oses); 383 if ((entry = pool_get(&pf_osfp_entry_pl, 384 PR_WAITOK|PR_LIMITFAIL)) == NULL) { 385 pool_put(&pf_osfp_pl, fp); 386 return (ENOMEM); 387 } 388 pf_osfp_insert(&pf_osfp_list, fp); 389 } 390 memcpy(entry, &fpioc->fp_os, sizeof(*entry)); 391 392 /* Make sure the strings are NUL terminated */ 393 entry->fp_class_nm[sizeof(entry->fp_class_nm)-1] = '\0'; 394 entry->fp_version_nm[sizeof(entry->fp_version_nm)-1] = '\0'; 395 entry->fp_subtype_nm[sizeof(entry->fp_subtype_nm)-1] = '\0'; 396 397 SLIST_INSERT_HEAD(&fp->fp_oses, entry, fp_entry); 398 399 #ifdef PFDEBUG 400 if ((fp = pf_osfp_validate())) 401 DPFPRINTF(LOG_NOTICE, 402 "Invalid fingerprint list"); 403 #endif /* PFDEBUG */ 404 return (0); 405 } 406 407 408 /* Find a fingerprint in the list */ 409 struct pf_os_fingerprint * 410 pf_osfp_find(struct pf_osfp_list *list, struct pf_os_fingerprint *find, 411 u_int8_t ttldiff) 412 { 413 struct pf_os_fingerprint *f; 414 415 #define MATCH_INT(_MOD, _DC, _field) \ 416 if ((f->fp_flags & _DC) == 0) { \ 417 if ((f->fp_flags & _MOD) == 0) { \ 418 if (f->_field != find->_field) \ 419 continue; \ 420 } else { \ 421 if (f->_field == 0 || find->_field % f->_field) \ 422 continue; \ 423 } \ 424 } 425 426 SLIST_FOREACH(f, list, fp_next) { 427 if (f->fp_tcpopts != find->fp_tcpopts || 428 f->fp_optcnt != find->fp_optcnt || 429 f->fp_ttl < find->fp_ttl || 430 f->fp_ttl - find->fp_ttl > ttldiff || 431 (f->fp_flags & (PF_OSFP_DF|PF_OSFP_TS0)) != 432 (find->fp_flags & (PF_OSFP_DF|PF_OSFP_TS0))) 433 continue; 434 435 MATCH_INT(PF_OSFP_PSIZE_MOD, PF_OSFP_PSIZE_DC, fp_psize) 436 MATCH_INT(PF_OSFP_MSS_MOD, PF_OSFP_MSS_DC, fp_mss) 437 MATCH_INT(PF_OSFP_WSCALE_MOD, PF_OSFP_WSCALE_DC, fp_wscale) 438 if ((f->fp_flags & PF_OSFP_WSIZE_DC) == 0) { 439 if (f->fp_flags & PF_OSFP_WSIZE_MSS) { 440 if (find->fp_mss == 0) 441 continue; 442 443 /* Some "smart" NAT devices and DSL routers will tweak the MSS size and 444 * will set it to whatever is suitable for the link type. 445 */ 446 #define SMART_MSS 1460 447 if ((find->fp_wsize % find->fp_mss || 448 find->fp_wsize / find->fp_mss != 449 f->fp_wsize) && 450 (find->fp_wsize % SMART_MSS || 451 find->fp_wsize / SMART_MSS != 452 f->fp_wsize)) 453 continue; 454 } else if (f->fp_flags & PF_OSFP_WSIZE_MTU) { 455 if (find->fp_mss == 0) 456 continue; 457 458 #define MTUOFF (sizeof(struct ip) + sizeof(struct tcphdr)) 459 #define SMART_MTU (SMART_MSS + MTUOFF) 460 if ((find->fp_wsize % (find->fp_mss + MTUOFF) || 461 find->fp_wsize / (find->fp_mss + MTUOFF) != 462 f->fp_wsize) && 463 (find->fp_wsize % SMART_MTU || 464 find->fp_wsize / SMART_MTU != 465 f->fp_wsize)) 466 continue; 467 } else if (f->fp_flags & PF_OSFP_WSIZE_MOD) { 468 if (f->fp_wsize == 0 || find->fp_wsize % 469 f->fp_wsize) 470 continue; 471 } else { 472 if (f->fp_wsize != find->fp_wsize) 473 continue; 474 } 475 } 476 return (f); 477 } 478 479 return (NULL); 480 } 481 482 /* Find an exact fingerprint in the list */ 483 struct pf_os_fingerprint * 484 pf_osfp_find_exact(struct pf_osfp_list *list, struct pf_os_fingerprint *find) 485 { 486 struct pf_os_fingerprint *f; 487 488 SLIST_FOREACH(f, list, fp_next) { 489 if (f->fp_tcpopts == find->fp_tcpopts && 490 f->fp_wsize == find->fp_wsize && 491 f->fp_psize == find->fp_psize && 492 f->fp_mss == find->fp_mss && 493 f->fp_flags == find->fp_flags && 494 f->fp_optcnt == find->fp_optcnt && 495 f->fp_wscale == find->fp_wscale && 496 f->fp_ttl == find->fp_ttl) 497 return (f); 498 } 499 500 return (NULL); 501 } 502 503 /* Insert a fingerprint into the list */ 504 void 505 pf_osfp_insert(struct pf_osfp_list *list, struct pf_os_fingerprint *ins) 506 { 507 struct pf_os_fingerprint *f, *prev = NULL; 508 509 /* XXX need to go semi tree based. can key on tcp options */ 510 511 SLIST_FOREACH(f, list, fp_next) 512 prev = f; 513 if (prev) 514 SLIST_INSERT_AFTER(prev, ins, fp_next); 515 else 516 SLIST_INSERT_HEAD(list, ins, fp_next); 517 } 518 519 /* Fill a fingerprint by its number (from an ioctl) */ 520 int 521 pf_osfp_get(struct pf_osfp_ioctl *fpioc) 522 { 523 struct pf_os_fingerprint *fp; 524 struct pf_osfp_entry *entry; 525 int num = fpioc->fp_getnum; 526 int i = 0; 527 528 529 memset(fpioc, 0, sizeof(*fpioc)); 530 SLIST_FOREACH(fp, &pf_osfp_list, fp_next) { 531 SLIST_FOREACH(entry, &fp->fp_oses, fp_entry) { 532 if (i++ == num) { 533 fpioc->fp_mss = fp->fp_mss; 534 fpioc->fp_wsize = fp->fp_wsize; 535 fpioc->fp_flags = fp->fp_flags; 536 fpioc->fp_psize = fp->fp_psize; 537 fpioc->fp_ttl = fp->fp_ttl; 538 fpioc->fp_wscale = fp->fp_wscale; 539 fpioc->fp_getnum = num; 540 memcpy(&fpioc->fp_os, entry, 541 sizeof(fpioc->fp_os)); 542 return (0); 543 } 544 } 545 } 546 547 return (EBUSY); 548 } 549 550 551 /* Validate that each signature is reachable */ 552 struct pf_os_fingerprint * 553 pf_osfp_validate(void) 554 { 555 struct pf_os_fingerprint *f, *f2, find; 556 557 SLIST_FOREACH(f, &pf_osfp_list, fp_next) { 558 memcpy(&find, f, sizeof(find)); 559 560 /* We do a few MSS/th_win percolations to make things unique */ 561 if (find.fp_mss == 0) 562 find.fp_mss = 128; 563 if (f->fp_flags & PF_OSFP_WSIZE_MSS) 564 find.fp_wsize *= find.fp_mss; 565 else if (f->fp_flags & PF_OSFP_WSIZE_MTU) 566 find.fp_wsize *= (find.fp_mss + 40); 567 else if (f->fp_flags & PF_OSFP_WSIZE_MOD) 568 find.fp_wsize *= 2; 569 if (f != (f2 = pf_osfp_find(&pf_osfp_list, &find, 0))) { 570 if (f2) 571 DPFPRINTF(LOG_NOTICE, 572 "Found \"%s %s %s\" instead of " 573 "\"%s %s %s\"\n", 574 SLIST_FIRST(&f2->fp_oses)->fp_class_nm, 575 SLIST_FIRST(&f2->fp_oses)->fp_version_nm, 576 SLIST_FIRST(&f2->fp_oses)->fp_subtype_nm, 577 SLIST_FIRST(&f->fp_oses)->fp_class_nm, 578 SLIST_FIRST(&f->fp_oses)->fp_version_nm, 579 SLIST_FIRST(&f->fp_oses)->fp_subtype_nm); 580 else 581 DPFPRINTF(LOG_NOTICE, 582 "Couldn't find \"%s %s %s\"\n", 583 SLIST_FIRST(&f->fp_oses)->fp_class_nm, 584 SLIST_FIRST(&f->fp_oses)->fp_version_nm, 585 SLIST_FIRST(&f->fp_oses)->fp_subtype_nm); 586 return (f); 587 } 588 } 589 return (NULL); 590 } 591