ip_fil_netbsd.c revision 1.16.2.6
1 /* $NetBSD: ip_fil_netbsd.c,v 1.16.2.6 2017/03/20 06:57:45 pgoyette Exp $ */ 2 3 /* 4 * Copyright (C) 2012 by Darren Reed. 5 * 6 * See the IPFILTER.LICENCE file for details on licencing. 7 */ 8 #if !defined(lint) 9 #if defined(__NetBSD__) 10 #include <sys/cdefs.h> 11 __KERNEL_RCSID(0, "$NetBSD: ip_fil_netbsd.c,v 1.16.2.6 2017/03/20 06:57:45 pgoyette Exp $"); 12 #else 13 static const char sccsid[] = "@(#)ip_fil.c 2.41 6/5/96 (C) 1993-2000 Darren Reed"; 14 static const char rcsid[] = "@(#)Id: ip_fil_netbsd.c,v 1.1.1.2 2012/07/22 13:45:17 darrenr Exp"; 15 #endif 16 #endif 17 18 #if defined(KERNEL) || defined(_KERNEL) 19 # undef KERNEL 20 # undef _KERNEL 21 # define KERNEL 1 22 # define _KERNEL 1 23 #endif 24 #include <sys/param.h> 25 #if (NetBSD >= 199905) && !defined(IPFILTER_LKM) 26 # if (__NetBSD_Version__ >= 799003000) 27 # ifdef _KERNEL_OPT 28 # include "opt_ipsec.h" 29 # endif 30 # else 31 # include "opt_ipsec.h" 32 # endif 33 #endif 34 #include <sys/errno.h> 35 #include <sys/types.h> 36 #include <sys/file.h> 37 #include <sys/ioctl.h> 38 #include <sys/time.h> 39 #include <sys/systm.h> 40 #include <sys/select.h> 41 #if (NetBSD > 199609) 42 # include <sys/dirent.h> 43 #else 44 # include <sys/dir.h> 45 #endif 46 #if (__NetBSD_Version__ >= 599005900) 47 # include <sys/cprng.h> 48 #endif 49 #include <sys/mbuf.h> 50 #include <sys/protosw.h> 51 #include <sys/socket.h> 52 #include <sys/poll.h> 53 #if (__NetBSD_Version__ >= 399002000) 54 # include <sys/kauth.h> 55 #endif 56 #if (__NetBSD_Version__ >= 799003000) 57 #include <sys/module.h> 58 #include <sys/mutex.h> 59 #endif 60 #if (__NetBSD_Version__ >= 799003300) 61 #include <sys/localcount.h> 62 #endif 63 64 #include <net/if.h> 65 #include <net/route.h> 66 #include <netinet/in.h> 67 #include <netinet/in_var.h> 68 #include <netinet/in_systm.h> 69 #include <netinet/ip.h> 70 #include <netinet/ip_var.h> 71 #include <netinet/tcp.h> 72 #if __NetBSD_Version__ >= 105190000 /* 1.5T */ 73 # include <netinet/tcp_timer.h> 74 # include <netinet/tcp_var.h> 75 #endif 76 #include <netinet/udp.h> 77 #include <netinet/tcpip.h> 78 #include <netinet/ip_icmp.h> 79 #include "netinet/ip_compat.h" 80 #ifdef USE_INET6 81 # include <netinet/icmp6.h> 82 # if (__NetBSD_Version__ >= 106000000) 83 # include <netinet6/nd6.h> 84 # endif 85 #endif 86 #include "netinet/ip_fil.h" 87 #include "netinet/ip_nat.h" 88 #include "netinet/ip_frag.h" 89 #include "netinet/ip_state.h" 90 #include "netinet/ip_proxy.h" 91 #include "netinet/ip_auth.h" 92 #include "netinet/ip_sync.h" 93 #include "netinet/ip_lookup.h" 94 #include "netinet/ip_dstlist.h" 95 #ifdef IPFILTER_SCAN 96 #include "netinet/ip_scan.h" 97 #endif 98 #include <sys/md5.h> 99 #include <sys/kernel.h> 100 #include <sys/conf.h> 101 #ifdef INET 102 extern int ip_optcopy (struct ip *, struct ip *); 103 #endif 104 105 #ifdef IPFILTER_M_IPFILTER 106 MALLOC_DEFINE(M_IPFILTER, "IP Filter", "IP Filter packet filter data structures"); 107 #endif 108 109 #if __NetBSD_Version__ >= 105009999 110 # define csuminfo csum_flags 111 #endif 112 113 #if __NetBSD_Version__ < 200000000 114 extern struct protosw inetsw[]; 115 #endif 116 117 #if (__NetBSD_Version__ >= 599002000) 118 static kauth_listener_t ipf_listener; 119 #endif 120 121 #if (__NetBSD_Version__ < 399001400) 122 extern int ip6_getpmtu (struct route_in6 *, struct route_in6 *, 123 struct ifnet *, struct in6_addr *, u_long *, 124 int *); 125 #endif 126 #if (NetBSD >= 199511) 127 static int ipfopen(dev_t dev, int flags, int devtype, PROC_T *p); 128 static int ipfclose(dev_t dev, int flags, int devtype, PROC_T *p); 129 #else 130 # if (__NetBSD_Version__ >= 399001400) 131 static int ipfopen(dev_t dev, int flags, struct lwp *); 132 static int ipfclose(dev_t dev, int flags, struct lwp *); 133 # else 134 static int ipfopen(dev_t dev, int flags); 135 static int ipfclose(dev_t dev, int flags); 136 # endif /* __NetBSD_Version__ >= 399001400 */ 137 #endif 138 static int ipfread(dev_t, struct uio *, int ioflag); 139 static int ipfwrite(dev_t, struct uio *, int ioflag); 140 static int ipfpoll(dev_t, int events, PROC_T *); 141 static void ipf_timer_func(void *ptr); 142 143 const struct cdevsw ipl_cdevsw = { 144 #if (__NetBSD_Version__ >= 799003300) 145 DEVSW_MODULE_INIT 146 #endif 147 .d_open = ipfopen, 148 .d_close = ipfclose, 149 .d_read = ipfread, 150 .d_write = ipfwrite, 151 .d_ioctl = ipfioctl, 152 .d_stop = nostop, 153 .d_tty = notty, 154 .d_poll = ipfpoll, 155 .d_mmap = nommap, 156 #if (__NetBSD_Version__ >= 200000000) 157 .d_kqfilter = nokqfilter, 158 #endif 159 .d_discard = nodiscard, 160 #ifdef D_OTHER 161 .d_flag = D_OTHER 162 #else 163 .d_flag = 0 164 #endif 165 }; 166 #if (__NetBSD_Version__ >= 799003000) 167 kmutex_t ipf_ref_mutex; 168 int ipf_active; 169 #endif 170 171 ipf_main_softc_t ipfmain; 172 173 static u_short ipid = 0; 174 static int (*ipf_savep)(void *, ip_t *, int, void *, int, struct mbuf **); 175 static int ipf_send_ip(fr_info_t *, mb_t *); 176 #ifdef USE_INET6 177 static int ipf_fastroute6(struct mbuf *, struct mbuf **, 178 fr_info_t *, frdest_t *); 179 #endif 180 181 #if defined(NETBSD_PF) 182 # include <net/pfil.h> 183 /* 184 * We provide the ipf_checkp name just to minimize changes later. 185 */ 186 int (*ipf_checkp)(void *, ip_t *ip, int hlen, void *ifp, int out, mb_t **mp); 187 #endif /* NETBSD_PF */ 188 189 #if defined(__NetBSD_Version__) && (__NetBSD_Version__ >= 105110000) 190 # include <net/pfil.h> 191 192 static int ipf_check_wrapper(void *, struct mbuf **, struct ifnet *, int ); 193 194 static int 195 ipf_check_wrapper(void *arg, struct mbuf **mp, struct ifnet *ifp, int dir) 196 { 197 struct ip *ip; 198 int rv, hlen; 199 200 #if __NetBSD_Version__ >= 200080000 201 /* 202 * ensure that mbufs are writable beforehand 203 * as it's assumed by ipf code. 204 * XXX inefficient 205 */ 206 int error = m_makewritable(mp, 0, M_COPYALL, M_DONTWAIT); 207 208 if (error) { 209 m_freem(*mp); 210 *mp = NULL; 211 return error; 212 } 213 #endif 214 ip = mtod(*mp, struct ip *); 215 hlen = ip->ip_hl << 2; 216 217 #ifdef INET 218 #if defined(M_CSUM_TCPv4) 219 /* 220 * If the packet is out-bound, we can't delay checksums 221 * here. For in-bound, the checksum has already been 222 * validated. 223 */ 224 if (dir == PFIL_OUT) { 225 if ((*mp)->m_pkthdr.csum_flags & (M_CSUM_TCPv4|M_CSUM_UDPv4)) { 226 in_delayed_cksum(*mp); 227 (*mp)->m_pkthdr.csum_flags &= 228 ~(M_CSUM_TCPv4|M_CSUM_UDPv4); 229 } 230 } 231 #endif /* M_CSUM_TCPv4 */ 232 #endif /* INET */ 233 234 /* 235 * Note, we don't need to update the checksum, because 236 * it has already been verified. 237 */ 238 rv = ipf_check(&ipfmain, ip, hlen, ifp, (dir == PFIL_OUT), mp); 239 240 return (rv); 241 } 242 243 # ifdef USE_INET6 244 # include <netinet/ip6.h> 245 246 static int ipf_check_wrapper6(void *, struct mbuf **, struct ifnet *, int ); 247 248 static int 249 ipf_check_wrapper6(void *arg, struct mbuf **mp, struct ifnet *ifp, int dir) 250 { 251 #if defined(INET6) 252 # if defined(M_CSUM_TCPv6) && (__NetBSD_Version__ > 200000000) 253 /* 254 * If the packet is out-bound, we can't delay checksums 255 * here. For in-bound, the checksum has already been 256 * validated. 257 */ 258 if (dir == PFIL_OUT) { 259 if ((*mp)->m_pkthdr.csum_flags & (M_CSUM_TCPv6|M_CSUM_UDPv6)) { 260 # if (__NetBSD_Version__ > 399000600) 261 in6_delayed_cksum(*mp); 262 # endif 263 (*mp)->m_pkthdr.csum_flags &= ~(M_CSUM_TCPv6| 264 M_CSUM_UDPv6); 265 } 266 } 267 # endif 268 #endif /* INET6 */ 269 270 return (ipf_check(&ipfmain, mtod(*mp, struct ip *), sizeof(struct ip6_hdr), 271 ifp, (dir == PFIL_OUT), mp)); 272 } 273 # endif 274 275 276 # if defined(PFIL_TYPE_IFNET) && defined(PFIL_IFNET) 277 278 # if (__NetBSD_Version__ >= 799000400) 279 280 static void ipf_pfilsync(void *, unsigned long, void *); 281 282 static void 283 ipf_pfilsync(void *hdr, unsigned long cmd, void *arg2) 284 { 285 /* 286 * The interface pointer is useless for create (we have nothing to 287 * compare it to) and at detach, the interface name is still in the 288 * list of active NICs (albeit, down, but that's not any real 289 * indicator) and doing ifunit() on the name will still return the 290 * pointer, so it's not much use then, either. 291 */ 292 ipf_sync(&ipfmain, NULL); 293 } 294 295 # else 296 297 static int ipf_pfilsync(void *, struct mbuf **, struct ifnet *, int); 298 299 static int 300 ipf_pfilsync(void *hdr, struct mbuf **mp, struct ifnet *ifp, int dir) 301 { 302 ipf_sync(&ipfmain, NULL); 303 return 0; 304 } 305 306 # endif 307 # endif 308 309 #endif /* __NetBSD_Version__ >= 105110000 */ 310 311 312 #if defined(IPFILTER_LKM) 313 int 314 ipf_identify(s) 315 char *s; 316 { 317 if (strcmp(s, "ipl") == 0) 318 return 1; 319 return 0; 320 } 321 #endif /* IPFILTER_LKM */ 322 323 #if (__NetBSD_Version__ >= 599002000) 324 static int 325 ipf_listener_cb(kauth_cred_t cred, kauth_action_t action, void *cookie, 326 void *arg0, void *arg1, void *arg2, void *arg3) 327 { 328 int result; 329 enum kauth_network_req req; 330 331 result = KAUTH_RESULT_DEFER; 332 req = (enum kauth_network_req)arg0; 333 334 if (action != KAUTH_NETWORK_FIREWALL) 335 return result; 336 337 /* These must have came from device context. */ 338 if ((req == KAUTH_REQ_NETWORK_FIREWALL_FW) || 339 (req == KAUTH_REQ_NETWORK_FIREWALL_NAT)) 340 result = KAUTH_RESULT_ALLOW; 341 342 return result; 343 } 344 #endif 345 346 /* 347 * Try to detect the case when compiling for NetBSD with pseudo-device 348 */ 349 void 350 ipfilterattach(int count) 351 { 352 353 #if (__NetBSD_Version__ >= 799003000) 354 return; 355 #else 356 #if (__NetBSD_Version__ >= 599002000) 357 ipf_listener = kauth_listen_scope(KAUTH_SCOPE_NETWORK, 358 ipf_listener_cb, NULL); 359 #endif 360 361 if (ipf_load_all() == 0) 362 (void) ipf_create_all(&ipfmain); 363 #endif 364 } 365 366 367 int 368 ipfattach(ipf_main_softc_t *softc) 369 { 370 SPL_INT(s); 371 #if (__NetBSD_Version__ >= 499005500) 372 int i; 373 #endif 374 #if defined(NETBSD_PF) && (__NetBSD_Version__ >= 104200000) 375 int error = 0; 376 # if defined(__NetBSD_Version__) && (__NetBSD_Version__ >= 105110000) 377 pfil_head_t *ph_inet; 378 # ifdef USE_INET6 379 pfil_head_t *ph_inet6; 380 # endif 381 # if defined(PFIL_TYPE_IFNET) && defined(PFIL_IFNET) 382 pfil_head_t *ph_ifsync; 383 # endif 384 # endif 385 #endif 386 387 SPL_NET(s); 388 if ((softc->ipf_running > 0) || (ipf_checkp == ipf_check)) { 389 printf("IP Filter: already initialized\n"); 390 SPL_X(s); 391 IPFERROR(130017); 392 return EBUSY; 393 } 394 395 if (ipf_init_all(softc) < 0) { 396 SPL_X(s); 397 IPFERROR(130015); 398 return EIO; 399 } 400 401 #ifdef NETBSD_PF 402 # if (__NetBSD_Version__ >= 104200000) 403 # if __NetBSD_Version__ >= 105110000 404 ph_inet = pfil_head_get(PFIL_TYPE_AF, (void *)AF_INET); 405 # ifdef USE_INET6 406 ph_inet6 = pfil_head_get(PFIL_TYPE_AF, (void *)AF_INET6); 407 # endif 408 # if defined(PFIL_TYPE_IFNET) && defined(PFIL_IFNET) 409 ph_ifsync = pfil_head_get(PFIL_TYPE_IFNET, 0); 410 # endif 411 412 if (ph_inet == NULL 413 # ifdef USE_INET6 414 && ph_inet6 == NULL 415 # endif 416 # if defined(PFIL_TYPE_IFNET) && defined(PFIL_IFNET) 417 && ph_ifsync == NULL 418 # endif 419 ) { 420 SPL_X(s); 421 IPFERROR(130016); 422 return ENODEV; 423 } 424 425 if (ph_inet != NULL) 426 error = pfil_add_hook((void *)ipf_check_wrapper, NULL, 427 PFIL_IN|PFIL_OUT, ph_inet); 428 else 429 error = 0; 430 # else 431 error = pfil_add_hook((void *)ipf_check, PFIL_IN|PFIL_OUT, 432 &inetsw[ip_protox[IPPROTO_IP]].pr_pfh); 433 # endif 434 if (error) { 435 IPFERROR(130013); 436 goto pfil_error; 437 } 438 # else 439 pfil_add_hook((void *)ipf_check, PFIL_IN|PFIL_OUT); 440 # endif 441 442 # ifdef USE_INET6 443 # if __NetBSD_Version__ >= 105110000 444 if (ph_inet6 != NULL) 445 error = pfil_add_hook((void *)ipf_check_wrapper6, NULL, 446 PFIL_IN|PFIL_OUT, ph_inet6); 447 else 448 error = 0; 449 if (error) { 450 pfil_remove_hook((void *)ipf_check_wrapper6, NULL, 451 PFIL_IN|PFIL_OUT, ph_inet6); 452 ipfmain.ipf_interror = 130014; 453 goto pfil_error; 454 } 455 # else 456 error = pfil_add_hook((void *)ipf_check, PFIL_IN|PFIL_OUT, 457 &inetsw[ip_protox[IPPROTO_IPV6]].pr_pfh); 458 if (error) { 459 pfil_remove_hook((void *)ipf_check, PFIL_IN|PFIL_OUT, 460 &inetsw[ip_protox[IPPROTO_IP]].pr_pfh); 461 IPFERROR(130014); 462 goto pfil_error; 463 } 464 # endif 465 # endif 466 467 # if defined(PFIL_TYPE_IFNET) && defined(PFIL_IFNET) 468 if (ph_ifsync != NULL) 469 #if (__NetBSD_Version__ >= 799000400) 470 (void) pfil_add_ihook((void *)ipf_pfilsync, NULL, 471 PFIL_IFNET, ph_ifsync); 472 #else 473 (void) pfil_add_hook((void *)ipf_pfilsync, NULL, 474 PFIL_IFNET, ph_ifsync); 475 #endif 476 # endif 477 #endif 478 479 #if (__NetBSD_Version__ >= 499005500) 480 for (i = 0; i < IPL_LOGSIZE; i++) 481 selinit(&ipfmain.ipf_selwait[i]); 482 #else 483 bzero((char *)ipfmain.ipf_selwait, sizeof(ipfmain.ipf_selwait)); 484 #endif 485 ipf_savep = ipf_checkp; 486 ipf_checkp = ipf_check; 487 488 #ifdef INET 489 if (softc->ipf_control_forwarding & 1) 490 ipforwarding = 1; 491 #endif 492 493 ipid = 0; 494 495 SPL_X(s); 496 497 #if (__NetBSD_Version__ >= 104010000) 498 # if (__NetBSD_Version__ >= 499002000) 499 callout_init(&softc->ipf_slow_ch, 0); 500 # else 501 callout_init(&softc->ipf_slow_ch); 502 # endif 503 callout_reset(&softc->ipf_slow_ch, (hz / IPF_HZ_DIVIDE) * IPF_HZ_MULT, 504 ipf_timer_func, softc); 505 #else 506 timeout(ipf_timer_func, softc, (hz / IPF_HZ_DIVIDE) * IPF_HZ_MULT); 507 #endif 508 509 return 0; 510 511 #if __NetBSD_Version__ >= 105110000 512 pfil_error: 513 SPL_X(s); 514 ipf_fini_all(softc); 515 return error; 516 #endif 517 } 518 519 static void 520 ipf_timer_func(void *ptr) 521 { 522 ipf_main_softc_t *softc = ptr; 523 SPL_INT(s); 524 525 SPL_NET(s); 526 READ_ENTER(&softc->ipf_global); 527 528 if (softc->ipf_running > 0) 529 ipf_slowtimer(softc); 530 531 if (softc->ipf_running == -1 || softc->ipf_running == 1) { 532 #if NETBSD_GE_REV(104240000) 533 callout_reset(&softc->ipf_slow_ch, hz / 2, 534 ipf_timer_func, softc); 535 #else 536 timeout(ipf_timer_func, softc, 537 (hz / IPF_HZ_DIVIDE) * IPF_HZ_MULT); 538 #endif 539 } 540 RWLOCK_EXIT(&softc->ipf_global); 541 SPL_X(s); 542 } 543 544 545 /* 546 * Disable the filter by removing the hooks from the IP input/output 547 * stream. 548 */ 549 int 550 ipfdetach(ipf_main_softc_t *softc) 551 { 552 SPL_INT(s); 553 #if (__NetBSD_Version__ >= 499005500) 554 int i; 555 #endif 556 #if defined(NETBSD_PF) && (__NetBSD_Version__ >= 104200000) 557 int error = 0; 558 # if __NetBSD_Version__ >= 105150000 559 pfil_head_t *ph_inet = pfil_head_get(PFIL_TYPE_AF, (void *)AF_INET); 560 # ifdef USE_INET6 561 pfil_head_t *ph_inet6 = pfil_head_get(PFIL_TYPE_AF, (void *)AF_INET6); 562 # endif 563 # if defined(PFIL_TYPE_IFNET) && defined(PFIL_IFNET) 564 struct pfil_head *ph_ifsync = pfil_head_get(PFIL_TYPE_IFNET, 0); 565 # endif 566 # endif 567 #endif 568 569 SPL_NET(s); 570 571 #if (__NetBSD_Version__ >= 104010000) 572 if (softc->ipf_running > 0) 573 callout_stop(&softc->ipf_slow_ch); 574 #else 575 untimeout(ipf_slowtimer, NULL); 576 #endif /* NetBSD */ 577 578 ipf_checkp = ipf_savep; 579 (void) ipf_flush(softc, IPL_LOGIPF, FR_INQUE|FR_OUTQUE|FR_INACTIVE); 580 (void) ipf_flush(softc, IPL_LOGIPF, FR_INQUE|FR_OUTQUE); 581 582 #ifdef INET 583 if (softc->ipf_control_forwarding & 2) 584 ipforwarding = 0; 585 #endif 586 587 #ifdef NETBSD_PF 588 # if (__NetBSD_Version__ >= 104200000) 589 # if __NetBSD_Version__ >= 105110000 590 # if defined(PFIL_TYPE_IFNET) && defined(PFIL_IFNET) 591 (void) pfil_remove_hook((void *)ipf_pfilsync, NULL, 592 PFIL_IFNET, ph_ifsync); 593 # endif 594 595 if (ph_inet != NULL) 596 error = pfil_remove_hook((void *)ipf_check_wrapper, NULL, 597 PFIL_IN|PFIL_OUT, ph_inet); 598 else 599 error = 0; 600 # else 601 error = pfil_remove_hook((void *)ipf_check, PFIL_IN|PFIL_OUT, 602 &inetsw[ip_protox[IPPROTO_IP]].pr_pfh); 603 # endif 604 if (error) { 605 SPL_X(s); 606 IPFERROR(130011); 607 return error; 608 } 609 # else 610 pfil_remove_hook((void *)ipf_check, PFIL_IN|PFIL_OUT); 611 # endif 612 # ifdef USE_INET6 613 # if __NetBSD_Version__ >= 105110000 614 if (ph_inet6 != NULL) 615 error = pfil_remove_hook((void *)ipf_check_wrapper6, NULL, 616 PFIL_IN|PFIL_OUT, ph_inet6); 617 else 618 error = 0; 619 # else 620 error = pfil_remove_hook((void *)ipf_check, PFIL_IN|PFIL_OUT, 621 &inetsw[ip_protox[IPPROTO_IPV6]].pr_pfh); 622 # endif 623 if (error) { 624 SPL_X(s); 625 IPFERROR(130012); 626 return error; 627 } 628 # endif 629 #endif 630 SPL_X(s); 631 632 #if (__NetBSD_Version__ >= 499005500) 633 for (i = 0; i < IPL_LOGSIZE; i++) 634 seldestroy(&ipfmain.ipf_selwait[i]); 635 #endif 636 637 ipf_fini_all(softc); 638 639 return 0; 640 } 641 642 643 /* 644 * Filter ioctl interface. 645 */ 646 int 647 ipfioctl(dev_t dev, u_long cmd, 648 #if (__NetBSD_Version__ >= 499001000) 649 void *data, 650 #else 651 caddr_t data, 652 #endif 653 int mode 654 #if (NetBSD >= 199511) 655 # if (__NetBSD_Version__ >= 399001400) 656 , struct lwp *p 657 # if (__NetBSD_Version__ >= 399002000) 658 # define UID(l) kauth_cred_getuid((l)->l_cred) 659 # else 660 # define UID(l) ((l)->l_proc->p_cred->p_ruid) 661 # endif 662 # else 663 , struct proc *p 664 # define UID(p) ((p)->p_cred->p_ruid) 665 # endif 666 #endif 667 ) 668 { 669 int error = 0, unit = 0; 670 SPL_INT(s); 671 672 #if (__NetBSD_Version__ >= 399002000) 673 if ((mode & FWRITE) && 674 kauth_authorize_network(p->l_cred, KAUTH_NETWORK_FIREWALL, 675 KAUTH_REQ_NETWORK_FIREWALL_FW, NULL, 676 NULL, NULL)) { 677 ipfmain.ipf_interror = 130005; 678 return EPERM; 679 } 680 #else 681 if ((securelevel >= 2) && (mode & FWRITE)) { 682 ipfmain.ipf_interror = 130001; 683 return EPERM; 684 } 685 #endif 686 687 unit = GET_MINOR(dev); 688 if ((IPL_LOGMAX < unit) || (unit < 0)) { 689 ipfmain.ipf_interror = 130002; 690 return ENXIO; 691 } 692 693 if (ipfmain.ipf_running <= 0) { 694 if (unit != IPL_LOGIPF && cmd != SIOCIPFINTERROR) { 695 ipfmain.ipf_interror = 130003; 696 return EIO; 697 } 698 if (cmd != SIOCIPFGETNEXT && cmd != SIOCIPFGET && 699 cmd != SIOCIPFSET && cmd != SIOCFRENB && 700 cmd != SIOCGETFS && cmd != SIOCGETFF && 701 cmd != SIOCIPFINTERROR) { 702 ipfmain.ipf_interror = 130004; 703 return EIO; 704 } 705 } 706 707 SPL_NET(s); 708 709 error = ipf_ioctlswitch(&ipfmain, unit, data, cmd, mode, UID(p), p); 710 if (error != -1) { 711 SPL_X(s); 712 return error; 713 } 714 715 SPL_X(s); 716 return error; 717 } 718 719 720 /* 721 * ipf_send_reset - this could conceivably be a call to tcp_respond(), but that 722 * requires a large amount of setting up and isn't any more efficient. 723 */ 724 int 725 ipf_send_reset(fr_info_t *fin) 726 { 727 struct tcphdr *tcp, *tcp2; 728 int tlen = 0, hlen; 729 struct mbuf *m; 730 #ifdef USE_INET6 731 ip6_t *ip6; 732 #endif 733 ip_t *ip; 734 735 tcp = fin->fin_dp; 736 if (tcp->th_flags & TH_RST) 737 return -1; /* feedback loop */ 738 739 if (ipf_checkl4sum(fin) == -1) 740 return -1; 741 742 tlen = fin->fin_dlen - (TCP_OFF(tcp) << 2) + 743 ((tcp->th_flags & TH_SYN) ? 1 : 0) + 744 ((tcp->th_flags & TH_FIN) ? 1 : 0); 745 746 #ifdef USE_INET6 747 hlen = (fin->fin_v == 6) ? sizeof(ip6_t) : sizeof(ip_t); 748 #else 749 hlen = sizeof(ip_t); 750 #endif 751 #ifdef MGETHDR 752 MGETHDR(m, M_DONTWAIT, MT_HEADER); 753 #else 754 MGET(m, M_DONTWAIT, MT_HEADER); 755 #endif 756 if (m == NULL) 757 return -1; 758 if (sizeof(*tcp2) + hlen > MHLEN) { 759 MCLGET(m, M_DONTWAIT); 760 if (m == NULL) 761 return -1; 762 if ((m->m_flags & M_EXT) == 0) { 763 FREE_MB_T(m); 764 return -1; 765 } 766 } 767 768 m->m_len = sizeof(*tcp2) + hlen; 769 m->m_data += max_linkhdr; 770 m->m_pkthdr.len = m->m_len; 771 m_reset_rcvif(m); 772 ip = mtod(m, struct ip *); 773 bzero((char *)ip, hlen); 774 #ifdef USE_INET6 775 ip6 = (ip6_t *)ip; 776 #endif 777 bzero((char *)ip, sizeof(*tcp2) + hlen); 778 tcp2 = (struct tcphdr *)((char *)ip + hlen); 779 tcp2->th_sport = tcp->th_dport; 780 tcp2->th_dport = tcp->th_sport; 781 782 if (tcp->th_flags & TH_ACK) { 783 tcp2->th_seq = tcp->th_ack; 784 tcp2->th_flags = TH_RST; 785 tcp2->th_ack = 0; 786 } else { 787 tcp2->th_seq = 0; 788 tcp2->th_ack = ntohl(tcp->th_seq); 789 tcp2->th_ack += tlen; 790 tcp2->th_ack = htonl(tcp2->th_ack); 791 tcp2->th_flags = TH_RST|TH_ACK; 792 } 793 tcp2->th_x2 = 0; 794 TCP_OFF_A(tcp2, sizeof(*tcp2) >> 2); 795 tcp2->th_win = tcp->th_win; 796 tcp2->th_sum = 0; 797 tcp2->th_urp = 0; 798 799 #ifdef USE_INET6 800 if (fin->fin_v == 6) { 801 ip6->ip6_flow = ((ip6_t *)fin->fin_ip)->ip6_flow; 802 ip6->ip6_plen = htons(sizeof(struct tcphdr)); 803 ip6->ip6_nxt = IPPROTO_TCP; 804 ip6->ip6_hlim = 0; 805 ip6->ip6_src = fin->fin_dst6.in6; 806 ip6->ip6_dst = fin->fin_src6.in6; 807 tcp2->th_sum = in6_cksum(m, IPPROTO_TCP, 808 sizeof(*ip6), sizeof(*tcp2)); 809 return ipf_send_ip(fin, m); 810 } 811 #endif 812 #ifdef INET 813 ip->ip_p = IPPROTO_TCP; 814 ip->ip_len = htons(sizeof(struct tcphdr)); 815 ip->ip_src.s_addr = fin->fin_daddr; 816 ip->ip_dst.s_addr = fin->fin_saddr; 817 tcp2->th_sum = in_cksum(m, hlen + sizeof(*tcp2)); 818 ip->ip_len = hlen + sizeof(*tcp2); 819 return ipf_send_ip(fin, m); 820 #else 821 return 0; 822 #endif 823 } 824 825 826 /* 827 * Expects ip_len to be in host byte order when called. 828 */ 829 static int 830 ipf_send_ip(fr_info_t *fin, mb_t *m) 831 { 832 fr_info_t fnew; 833 #ifdef INET 834 ip_t *oip; 835 #endif 836 ip_t *ip; 837 int hlen; 838 839 ip = mtod(m, ip_t *); 840 bzero((char *)&fnew, sizeof(fnew)); 841 fnew.fin_main_soft = fin->fin_main_soft; 842 843 IP_V_A(ip, fin->fin_v); 844 switch (fin->fin_v) 845 { 846 #ifdef INET 847 case 4 : 848 oip = fin->fin_ip; 849 hlen = sizeof(*oip); 850 fnew.fin_v = 4; 851 fnew.fin_p = ip->ip_p; 852 fnew.fin_plen = ntohs(ip->ip_len); 853 HTONS(ip->ip_len); 854 IP_HL_A(ip, sizeof(*oip) >> 2); 855 ip->ip_tos = oip->ip_tos; 856 ip->ip_id = ipf_nextipid(fin); 857 ip->ip_off = htons(ip_mtudisc ? IP_DF : 0); 858 ip->ip_ttl = ip_defttl; 859 ip->ip_sum = 0; 860 break; 861 #endif 862 #ifdef USE_INET6 863 case 6 : 864 { 865 ip6_t *ip6 = (ip6_t *)ip; 866 867 ip6->ip6_vfc = 0x60; 868 ip6->ip6_hlim = IPDEFTTL; 869 870 hlen = sizeof(*ip6); 871 fnew.fin_p = ip6->ip6_nxt; 872 fnew.fin_v = 6; 873 fnew.fin_plen = ntohs(ip6->ip6_plen) + hlen; 874 break; 875 } 876 #endif 877 default : 878 return EINVAL; 879 } 880 #ifdef KAME_IPSEC 881 m_reset_rcvif(m); 882 #endif 883 884 fnew.fin_ifp = fin->fin_ifp; 885 fnew.fin_flx = FI_NOCKSUM; 886 fnew.fin_m = m; 887 fnew.fin_ip = ip; 888 fnew.fin_mp = &m; 889 fnew.fin_hlen = hlen; 890 fnew.fin_dp = (char *)ip + hlen; 891 (void) ipf_makefrip(hlen, ip, &fnew); 892 893 return ipf_fastroute(m, &m, &fnew, NULL); 894 } 895 896 897 int 898 ipf_send_icmp_err(int type, fr_info_t *fin, int dst) 899 { 900 int err, hlen, xtra, iclen, ohlen, avail; 901 struct in_addr dst4; 902 struct icmp *icmp; 903 struct mbuf *m; 904 i6addr_t dst6; 905 void *ifp; 906 #ifdef USE_INET6 907 int code; 908 ip6_t *ip6; 909 #endif 910 ip_t *ip, *ip2; 911 912 if ((type < 0) || (type > ICMP_MAXTYPE)) 913 return -1; 914 915 #ifdef USE_INET6 916 code = fin->fin_icode; 917 if ((code < 0) || (code >= sizeof(icmptoicmp6unreach)/sizeof(int))) 918 return -1; 919 #endif 920 921 if (ipf_checkl4sum(fin) == -1) 922 return -1; 923 #ifdef MGETHDR 924 MGETHDR(m, M_DONTWAIT, MT_HEADER); 925 #else 926 MGET(m, M_DONTWAIT, MT_HEADER); 927 #endif 928 if (m == NULL) 929 return -1; 930 avail = MHLEN; 931 932 xtra = 0; 933 hlen = 0; 934 ohlen = 0; 935 dst4.s_addr = 0; 936 ifp = fin->fin_ifp; 937 if (fin->fin_v == 4) { 938 if ((fin->fin_p == IPPROTO_ICMP) && !(fin->fin_flx & FI_SHORT)) 939 switch (ntohs(fin->fin_data[0]) >> 8) 940 { 941 case ICMP_ECHO : 942 case ICMP_TSTAMP : 943 case ICMP_IREQ : 944 case ICMP_MASKREQ : 945 break; 946 default : 947 FREE_MB_T(m); 948 return 0; 949 } 950 951 if (dst == 0) { 952 if (ipf_ifpaddr(&ipfmain, 4, FRI_NORMAL, ifp, 953 &dst6, NULL) == -1) { 954 FREE_MB_T(m); 955 return -1; 956 } 957 dst4 = dst6.in4; 958 } else 959 dst4.s_addr = fin->fin_daddr; 960 961 hlen = sizeof(ip_t); 962 ohlen = fin->fin_hlen; 963 iclen = hlen + offsetof(struct icmp, icmp_ip) + ohlen; 964 if (fin->fin_hlen < fin->fin_plen) 965 xtra = MIN(fin->fin_dlen, 8); 966 else 967 xtra = 0; 968 } 969 970 #ifdef USE_INET6 971 else if (fin->fin_v == 6) { 972 hlen = sizeof(ip6_t); 973 ohlen = sizeof(ip6_t); 974 iclen = hlen + offsetof(struct icmp, icmp_ip) + ohlen; 975 type = icmptoicmp6types[type]; 976 if (type == ICMP6_DST_UNREACH) 977 code = icmptoicmp6unreach[code]; 978 979 if (iclen + max_linkhdr + fin->fin_plen > avail) { 980 MCLGET(m, M_DONTWAIT); 981 if (m == NULL) 982 return -1; 983 if ((m->m_flags & M_EXT) == 0) { 984 FREE_MB_T(m); 985 return -1; 986 } 987 avail = MCLBYTES; 988 } 989 xtra = MIN(fin->fin_plen, avail - iclen - max_linkhdr); 990 xtra = MIN(xtra, IPV6_MMTU - iclen); 991 if (dst == 0) { 992 if (ipf_ifpaddr(&ipfmain, 6, FRI_NORMAL, ifp, 993 &dst6, NULL) == -1) { 994 FREE_MB_T(m); 995 return -1; 996 } 997 } else 998 dst6 = fin->fin_dst6; 999 } 1000 #endif 1001 else { 1002 FREE_MB_T(m); 1003 return -1; 1004 } 1005 1006 avail -= (max_linkhdr + iclen); 1007 if (avail < 0) { 1008 FREE_MB_T(m); 1009 return -1; 1010 } 1011 if (xtra > avail) 1012 xtra = avail; 1013 iclen += xtra; 1014 m->m_data += max_linkhdr; 1015 m_reset_rcvif(m); 1016 m->m_pkthdr.len = iclen; 1017 m->m_len = iclen; 1018 ip = mtod(m, ip_t *); 1019 icmp = (struct icmp *)((char *)ip + hlen); 1020 ip2 = (ip_t *)&icmp->icmp_ip; 1021 1022 icmp->icmp_type = type; 1023 icmp->icmp_code = fin->fin_icode; 1024 icmp->icmp_cksum = 0; 1025 #ifdef icmp_nextmtu 1026 if (type == ICMP_UNREACH && fin->fin_icode == ICMP_UNREACH_NEEDFRAG) { 1027 if (fin->fin_mtu != 0) { 1028 icmp->icmp_nextmtu = htons(fin->fin_mtu); 1029 1030 } else if (ifp != NULL) { 1031 icmp->icmp_nextmtu = htons(GETIFMTU_4(ifp)); 1032 1033 } else { /* make up a number... */ 1034 icmp->icmp_nextmtu = htons(fin->fin_plen - 20); 1035 } 1036 } 1037 #endif 1038 1039 bcopy((char *)fin->fin_ip, (char *)ip2, ohlen); 1040 1041 #if defined(M_CSUM_IPv4) 1042 /* 1043 * Clear any in-bound checksum flags for this packet. 1044 */ 1045 m->m_pkthdr.csuminfo = 0; 1046 #endif /* __NetBSD__ && M_CSUM_IPv4 */ 1047 1048 #ifdef USE_INET6 1049 ip6 = (ip6_t *)ip; 1050 if (fin->fin_v == 6) { 1051 ip6->ip6_flow = ((ip6_t *)fin->fin_ip)->ip6_flow; 1052 ip6->ip6_plen = htons(iclen - hlen); 1053 ip6->ip6_nxt = IPPROTO_ICMPV6; 1054 ip6->ip6_hlim = 0; 1055 ip6->ip6_src = dst6.in6; 1056 ip6->ip6_dst = fin->fin_src6.in6; 1057 if (xtra > 0) 1058 bcopy((char *)fin->fin_ip + ohlen, 1059 (char *)&icmp->icmp_ip + ohlen, xtra); 1060 icmp->icmp_cksum = in6_cksum(m, IPPROTO_ICMPV6, 1061 sizeof(*ip6), iclen - hlen); 1062 } else 1063 #endif 1064 { 1065 ip->ip_p = IPPROTO_ICMP; 1066 ip->ip_src.s_addr = dst4.s_addr; 1067 ip->ip_dst.s_addr = fin->fin_saddr; 1068 1069 if (xtra > 0) 1070 bcopy((char *)fin->fin_ip + ohlen, 1071 (char *)&icmp->icmp_ip + ohlen, xtra); 1072 icmp->icmp_cksum = ipf_cksum((u_short *)icmp, 1073 sizeof(*icmp) + 8); 1074 ip->ip_len = iclen; 1075 ip->ip_p = IPPROTO_ICMP; 1076 } 1077 err = ipf_send_ip(fin, m); 1078 return err; 1079 } 1080 1081 1082 /* 1083 * m0 - pointer to mbuf where the IP packet starts 1084 * mpp - pointer to the mbuf pointer that is the start of the mbuf chain 1085 */ 1086 int 1087 ipf_fastroute(mb_t *m0, mb_t **mpp, fr_info_t *fin, frdest_t *fdp) 1088 { 1089 register struct ip *ip, *mhip; 1090 register struct mbuf *m = *mpp; 1091 register struct route *ro; 1092 int len, off, error = 0, hlen, code; 1093 struct ifnet *ifp, *sifp; 1094 ipf_main_softc_t *softc; 1095 #if __NetBSD_Version__ >= 499001100 1096 union { 1097 struct sockaddr dst; 1098 struct sockaddr_in dst4; 1099 } u; 1100 #else 1101 struct sockaddr_in *dst4; 1102 #endif 1103 struct sockaddr *dst; 1104 u_short ip_off, ip_len; 1105 struct route iproute; 1106 struct rtentry *rt; 1107 frdest_t node; 1108 frentry_t *fr; 1109 1110 if (fin->fin_v == 6) { 1111 #ifdef USE_INET6 1112 error = ipf_fastroute6(m0, mpp, fin, fdp); 1113 #else 1114 error = EPROTONOSUPPORT; 1115 #endif 1116 if ((error != 0) && (*mpp != NULL)) 1117 FREE_MB_T(*mpp); 1118 return error; 1119 } 1120 #ifndef INET 1121 FREE_MB_T(*mpp); 1122 return EPROTONOSUPPORT; 1123 #else 1124 1125 hlen = fin->fin_hlen; 1126 ip = mtod(m0, struct ip *); 1127 softc = fin->fin_main_soft; 1128 rt = NULL; 1129 ifp = NULL; 1130 1131 # if defined(M_CSUM_IPv4) 1132 /* 1133 * Clear any in-bound checksum flags for this packet. 1134 */ 1135 m0->m_pkthdr.csuminfo = 0; 1136 # endif /* __NetBSD__ && M_CSUM_IPv4 */ 1137 1138 /* 1139 * Route packet. 1140 */ 1141 ro = &iproute; 1142 memset(ro, 0, sizeof(*ro)); 1143 fr = fin->fin_fr; 1144 1145 if ((fr != NULL) && !(fr->fr_flags & FR_KEEPSTATE) && (fdp != NULL) && 1146 (fdp->fd_type == FRD_DSTLIST)) { 1147 if (ipf_dstlist_select_node(fin, fdp->fd_ptr, NULL, &node) == 0) 1148 fdp = &node; 1149 } 1150 if (fdp != NULL) 1151 ifp = fdp->fd_ptr; 1152 else 1153 ifp = fin->fin_ifp; 1154 1155 if ((ifp == NULL) && ((fr == NULL) || !(fr->fr_flags & FR_FASTROUTE))) { 1156 error = -2; 1157 goto bad; 1158 } 1159 1160 # if __NetBSD_Version__ >= 499001100 1161 if ((fdp != NULL) && (fdp->fd_ip.s_addr != 0)) 1162 sockaddr_in_init(&u.dst4, &fdp->fd_ip, 0); 1163 else 1164 sockaddr_in_init(&u.dst4, &ip->ip_dst, 0); 1165 dst = &u.dst; 1166 rtcache_setdst(ro, dst); 1167 rt = rtcache_init(ro); 1168 # else 1169 dst4 = (struct sockaddr_in *)&ro->ro_dst; 1170 dst = (struct sockaddr *)dst4; 1171 dst4->sin_family = AF_INET; 1172 dst4->sin_addr = ip->ip_dst; 1173 1174 if ((fdp != NULL) && (fdp->fd_ip.s_addr != 0)) 1175 dst4->sin_addr = fdp->fd_ip; 1176 1177 dst4->sin_len = sizeof(*dst); 1178 rtalloc(ro); 1179 rt = ro->ro_rt; 1180 # endif 1181 if ((ifp == NULL) && (rt != NULL)) 1182 ifp = rt->rt_ifp; 1183 if ((rt == NULL) || (ifp == NULL)) { 1184 #ifdef INET 1185 if (in_localaddr(ip->ip_dst)) 1186 error = EHOSTUNREACH; 1187 else 1188 #endif 1189 error = ENETUNREACH; 1190 goto bad; 1191 } 1192 1193 1194 if (rt->rt_flags & RTF_GATEWAY) 1195 dst = rt->rt_gateway; 1196 1197 rt->rt_use++; 1198 1199 /* 1200 * For input packets which are being "fastrouted", they won't 1201 * go back through output filtering and miss their chance to get 1202 * NAT'd and counted. Duplicated packets aren't considered to be 1203 * part of the normal packet stream, so do not NAT them or pass 1204 * them through stateful checking, etc. 1205 */ 1206 if ((fdp != &fr->fr_dif) && (fin->fin_out == 0)) { 1207 sifp = fin->fin_ifp; 1208 fin->fin_ifp = ifp; 1209 fin->fin_out = 1; 1210 (void) ipf_acctpkt(fin, NULL); 1211 fin->fin_fr = NULL; 1212 if (!fr || !(fr->fr_flags & FR_RETMASK)) { 1213 u_32_t pass; 1214 1215 (void) ipf_state_check(fin, &pass); 1216 } 1217 1218 switch (ipf_nat_checkout(fin, NULL)) 1219 { 1220 case 0 : 1221 break; 1222 case 1 : 1223 ip->ip_sum = 0; 1224 break; 1225 case -1 : 1226 error = -1; 1227 goto bad; 1228 break; 1229 } 1230 1231 fin->fin_ifp = sifp; 1232 fin->fin_out = 0; 1233 } else 1234 ip->ip_sum = 0; 1235 /* 1236 * If small enough for interface, can just send directly. 1237 */ 1238 m_set_rcvif(m, ifp); 1239 1240 ip_len = ntohs(ip->ip_len); 1241 if (ip_len <= ifp->if_mtu) { 1242 # if defined(M_CSUM_IPv4) 1243 # if (__NetBSD_Version__ >= 105009999) 1244 if (ifp->if_csum_flags_tx & M_CSUM_IPv4) 1245 m->m_pkthdr.csuminfo |= M_CSUM_IPv4; 1246 # else 1247 if (ifp->if_capabilities & IFCAP_CSUM_IPv4) 1248 m->m_pkthdr.csuminfo |= M_CSUM_IPv4; 1249 # endif /* (__NetBSD_Version__ >= 105009999) */ 1250 else if (ip->ip_sum == 0) 1251 ip->ip_sum = in_cksum(m, hlen); 1252 # else 1253 if (!ip->ip_sum) 1254 ip->ip_sum = in_cksum(m, hlen); 1255 # endif /* M_CSUM_IPv4 */ 1256 1257 error = if_output_lock(ifp, ifp, m, dst, rt); 1258 goto done; 1259 } 1260 1261 /* 1262 * Too large for interface; fragment if possible. 1263 * Must be able to put at least 8 bytes per fragment. 1264 */ 1265 ip_off = ntohs(ip->ip_off); 1266 if (ip_off & IP_DF) { 1267 error = EMSGSIZE; 1268 goto bad; 1269 } 1270 len = (ifp->if_mtu - hlen) &~ 7; 1271 if (len < 8) { 1272 error = EMSGSIZE; 1273 goto bad; 1274 } 1275 1276 { 1277 int mhlen, firstlen = len; 1278 struct mbuf **mnext = &m->m_act; 1279 1280 /* 1281 * Loop through length of segment after first fragment, 1282 * make new header and copy data of each part and link onto chain. 1283 */ 1284 m0 = m; 1285 mhlen = sizeof (struct ip); 1286 for (off = hlen + len; off < ip_len; off += len) { 1287 # ifdef MGETHDR 1288 MGETHDR(m, M_DONTWAIT, MT_HEADER); 1289 # else 1290 MGET(m, M_DONTWAIT, MT_HEADER); 1291 # endif 1292 if (m == 0) { 1293 m = m0; 1294 error = ENOBUFS; 1295 goto bad; 1296 } 1297 m->m_data += max_linkhdr; 1298 mhip = mtod(m, struct ip *); 1299 bcopy((char *)ip, (char *)mhip, sizeof(*ip)); 1300 #ifdef INET 1301 if (hlen > sizeof (struct ip)) { 1302 mhlen = ip_optcopy(ip, mhip) + sizeof (struct ip); 1303 IP_HL_A(mhip, mhlen >> 2); 1304 } 1305 #endif 1306 m->m_len = mhlen; 1307 mhip->ip_off = ((off - hlen) >> 3) + ip_off; 1308 if (off + len >= ip_len) 1309 len = ip_len - off; 1310 else 1311 mhip->ip_off |= IP_MF; 1312 mhip->ip_len = htons((u_short)(len + mhlen)); 1313 m->m_next = m_copy(m0, off, len); 1314 if (m->m_next == 0) { 1315 error = ENOBUFS; /* ??? */ 1316 goto sendorfree; 1317 } 1318 m->m_pkthdr.len = mhlen + len; 1319 m_reset_rcvif(m); 1320 mhip->ip_off = htons((u_short)mhip->ip_off); 1321 mhip->ip_sum = 0; 1322 #ifdef INET 1323 mhip->ip_sum = in_cksum(m, mhlen); 1324 #endif 1325 *mnext = m; 1326 mnext = &m->m_act; 1327 } 1328 /* 1329 * Update first fragment by trimming what's been copied out 1330 * and updating header, then send each fragment (in order). 1331 */ 1332 m_adj(m0, hlen + firstlen - ip_len); 1333 ip->ip_len = htons((u_short)(hlen + firstlen)); 1334 ip->ip_off = htons((u_short)IP_MF); 1335 ip->ip_sum = 0; 1336 #ifdef INET 1337 ip->ip_sum = in_cksum(m0, hlen); 1338 #endif 1339 sendorfree: 1340 for (m = m0; m; m = m0) { 1341 m0 = m->m_act; 1342 m->m_act = 0; 1343 if (error == 0) { 1344 KERNEL_LOCK(1, NULL); 1345 error = (*ifp->if_output)(ifp, m, dst, rt); 1346 KERNEL_UNLOCK_ONE(NULL); 1347 } else { 1348 FREE_MB_T(m); 1349 } 1350 } 1351 } 1352 done: 1353 if (!error) 1354 softc->ipf_frouteok[0]++; 1355 else 1356 softc->ipf_frouteok[1]++; 1357 1358 # if __NetBSD_Version__ >= 499001100 1359 rtcache_unref(rt, ro); 1360 rtcache_free(ro); 1361 # else 1362 if (rt) { 1363 RTFREE(rt); 1364 } 1365 # endif 1366 return error; 1367 bad: 1368 if (error == EMSGSIZE) { 1369 sifp = fin->fin_ifp; 1370 code = fin->fin_icode; 1371 fin->fin_icode = ICMP_UNREACH_NEEDFRAG; 1372 fin->fin_ifp = ifp; 1373 (void) ipf_send_icmp_err(ICMP_UNREACH, fin, 1); 1374 fin->fin_ifp = sifp; 1375 fin->fin_icode = code; 1376 } 1377 FREE_MB_T(m); 1378 goto done; 1379 #endif /* INET */ 1380 } 1381 1382 1383 #if defined(USE_INET6) 1384 /* 1385 * This is the IPv6 specific fastroute code. It doesn't clean up the mbuf's 1386 * or ensure that it is an IPv6 packet that is being forwarded, those are 1387 * expected to be done by the called (ipf_fastroute). 1388 */ 1389 static int 1390 ipf_fastroute6(struct mbuf *m0, struct mbuf **mpp, fr_info_t *fin, 1391 frdest_t *fdp) 1392 { 1393 # if __NetBSD_Version__ >= 499001100 1394 struct route ip6route; 1395 const struct sockaddr *dst; 1396 union { 1397 struct sockaddr dst; 1398 struct sockaddr_in6 dst6; 1399 } u; 1400 struct route *ro; 1401 # else 1402 struct route_in6 ip6route; 1403 struct sockaddr_in6 *dst6; 1404 struct route_in6 *ro; 1405 # endif 1406 struct rtentry *rt; 1407 struct ifnet *ifp; 1408 u_long mtu; 1409 int error; 1410 1411 error = 0; 1412 ro = &ip6route; 1413 1414 if (fdp != NULL) 1415 ifp = fdp->fd_ptr; 1416 else 1417 ifp = fin->fin_ifp; 1418 memset(ro, 0, sizeof(*ro)); 1419 # if __NetBSD_Version__ >= 499001100 1420 if (fdp != NULL && IP6_NOTZERO(&fdp->fd_ip6)) 1421 sockaddr_in6_init(&u.dst6, &fdp->fd_ip6.in6, 0, 0, 0); 1422 else 1423 sockaddr_in6_init(&u.dst6, &fin->fin_fi.fi_dst.in6, 0, 0, 0); 1424 dst = &u.dst; 1425 rtcache_setdst(ro, dst); 1426 1427 rt = rtcache_init(ro); 1428 if ((ifp == NULL) && (rt != NULL)) 1429 ifp = rt->rt_ifp; 1430 # else 1431 dst6 = (struct sockaddr_in6 *)&ro->ro_dst; 1432 dst6->sin6_family = AF_INET6; 1433 dst6->sin6_len = sizeof(struct sockaddr_in6); 1434 dst6->sin6_addr = fin->fin_fi.fi_dst.in6; 1435 1436 if (fdp != NULL) { 1437 if (IP6_NOTZERO(&fdp->fd_ip6)) 1438 dst6->sin6_addr = fdp->fd_ip6.in6; 1439 } 1440 1441 rtalloc((struct route *)ro); 1442 1443 if ((ifp == NULL) && (ro->ro_rt != NULL)) 1444 ifp = ro->ro_rt->rt_ifp; 1445 rt = ro->ro_rt; 1446 # endif 1447 if ((rt == NULL) || (ifp == NULL)) { 1448 1449 error = EHOSTUNREACH; 1450 goto bad; 1451 } 1452 1453 /* KAME */ 1454 # if __NetBSD_Version__ >= 499001100 1455 if (IN6_IS_ADDR_LINKLOCAL(&u.dst6.sin6_addr)) 1456 u.dst6.sin6_addr.s6_addr16[1] = htons(ifp->if_index); 1457 # else 1458 if (IN6_IS_ADDR_LINKLOCAL(&dst6->sin6_addr)) 1459 dst6->sin6_addr.s6_addr16[1] = htons(ifp->if_index); 1460 # endif 1461 1462 { 1463 # if (__NetBSD_Version__ >= 106010000) && !defined(IN6_LINKMTU) 1464 struct in6_ifextra *ife; 1465 # endif 1466 if (rt->rt_flags & RTF_GATEWAY) 1467 # if __NetBSD_Version__ >= 499001100 1468 dst = rt->rt_gateway; 1469 # else 1470 dst6 = (struct sockaddr_in6 *)rt->rt_gateway; 1471 # endif 1472 rt->rt_use++; 1473 1474 /* Determine path MTU. */ 1475 # if (__NetBSD_Version__ <= 106009999) 1476 mtu = nd_ifinfo[ifp->if_index].linkmtu; 1477 # else 1478 # ifdef IN6_LINKMTU 1479 mtu = IN6_LINKMTU(ifp); 1480 # else 1481 ife = (struct in6_ifextra *)(ifp)->if_afdata[AF_INET6]; 1482 mtu = ife->nd_ifinfo[ifp->if_index].linkmtu; 1483 # endif 1484 # endif 1485 if ((error == 0) && (m0->m_pkthdr.len <= mtu)) { 1486 # if __NetBSD_Version__ >= 499001100 1487 error = ip6_if_output(ifp, ifp, m0, satocsin6(dst), rt); 1488 # else 1489 error = nd6_output(ifp, ifp, m0, dst6, rt); 1490 # endif 1491 } else { 1492 error = EMSGSIZE; 1493 } 1494 } 1495 bad: 1496 # if __NetBSD_Version__ >= 499001100 1497 rtcache_unref(rt, ro); 1498 rtcache_free(ro); 1499 # else 1500 if (ro->ro_rt != NULL) { 1501 RTFREE(((struct route *)ro)->ro_rt); 1502 } 1503 # endif 1504 return error; 1505 } 1506 #endif /* INET6 */ 1507 1508 1509 int 1510 ipf_verifysrc(fr_info_t *fin) 1511 { 1512 #if __NetBSD_Version__ >= 499001100 1513 union { 1514 struct sockaddr dst; 1515 struct sockaddr_in dst4; 1516 } u; 1517 struct rtentry *rt; 1518 #else 1519 struct sockaddr_in *dst; 1520 #endif 1521 struct route iproute; 1522 int rc; 1523 1524 #if __NetBSD_Version__ >= 499001100 1525 sockaddr_in_init(&u.dst4, &fin->fin_src, 0); 1526 rtcache_setdst(&iproute, &u.dst); 1527 rt = rtcache_init(&iproute); 1528 if (rt == NULL) 1529 rc = 0; 1530 else 1531 rc = (fin->fin_ifp == rt->rt_ifp); 1532 rtcache_unref(rt, &iproute); 1533 rtcache_free(&iproute); 1534 #else 1535 dst = (struct sockaddr_in *)&iproute.ro_dst; 1536 dst->sin_len = sizeof(*dst); 1537 dst->sin_family = AF_INET; 1538 dst->sin_addr = fin->fin_src; 1539 rtalloc(&iproute); 1540 if (iproute.ro_rt == NULL) 1541 return 0; 1542 rc = (fin->fin_ifp == iproute.ro_rt->rt_ifp); 1543 RTFREE(iproute.ro_rt); 1544 #endif 1545 return rc; 1546 } 1547 1548 1549 /* 1550 * return the first IP Address associated with an interface 1551 */ 1552 int 1553 ipf_ifpaddr(ipf_main_softc_t *softc, int v, int atype, void *ifptr, 1554 i6addr_t *inp, i6addr_t *inpmask) 1555 { 1556 #ifdef USE_INET6 1557 struct in6_addr *inp6 = NULL; 1558 #endif 1559 struct sockaddr *sock, *mask; 1560 struct sockaddr_in *sin; 1561 struct ifaddr *ifa; 1562 struct ifnet *ifp; 1563 1564 if ((ifptr == NULL) || (ifptr == (void *)-1)) 1565 return -1; 1566 1567 ifp = ifptr; 1568 mask = NULL; 1569 1570 if (v == 4) 1571 inp->in4.s_addr = 0; 1572 #ifdef USE_INET6 1573 else if (v == 6) 1574 bzero((char *)inp, sizeof(*inp)); 1575 #endif 1576 1577 ifa = IFADDR_READER_FIRST(ifp); 1578 sock = ifa ? ifa->ifa_addr : NULL; 1579 while (sock != NULL && ifa != NULL) { 1580 sin = (struct sockaddr_in *)sock; 1581 if ((v == 4) && (sin->sin_family == AF_INET)) 1582 break; 1583 #ifdef USE_INET6 1584 if ((v == 6) && (sin->sin_family == AF_INET6)) { 1585 inp6 = &((struct sockaddr_in6 *)sin)->sin6_addr; 1586 if (!IN6_IS_ADDR_LINKLOCAL(inp6) && 1587 !IN6_IS_ADDR_LOOPBACK(inp6)) 1588 break; 1589 } 1590 #endif 1591 ifa = IFADDR_READER_NEXT(ifa); 1592 if (ifa != NULL) 1593 sock = ifa->ifa_addr; 1594 } 1595 if (ifa == NULL || sock == NULL) 1596 return -1; 1597 1598 mask = ifa->ifa_netmask; 1599 if (atype == FRI_BROADCAST) 1600 sock = ifa->ifa_broadaddr; 1601 else if (atype == FRI_PEERADDR) 1602 sock = ifa->ifa_dstaddr; 1603 1604 #ifdef USE_INET6 1605 if (v == 6) 1606 return ipf_ifpfillv6addr(atype, (struct sockaddr_in6 *)sock, 1607 (struct sockaddr_in6 *)mask, 1608 inp, inpmask); 1609 #endif 1610 return ipf_ifpfillv4addr(atype, (struct sockaddr_in *)sock, 1611 (struct sockaddr_in *)mask, 1612 &inp->in4, &inpmask->in4); 1613 } 1614 1615 1616 u_32_t 1617 ipf_newisn(fr_info_t *fin) 1618 { 1619 #if __NetBSD_Version__ >= 105190000 /* 1.5T */ 1620 size_t asz; 1621 1622 if (fin->fin_v == 4) 1623 asz = sizeof(struct in_addr); 1624 else if (fin->fin_v == 6) 1625 asz = sizeof(fin->fin_src); 1626 else /* XXX: no way to return error */ 1627 return 0; 1628 #ifdef INET 1629 return tcp_new_iss1((void *)&fin->fin_src, (void *)&fin->fin_dst, 1630 fin->fin_sport, fin->fin_dport, asz, 0); 1631 #else 1632 return ENOSYS; 1633 #endif 1634 #else 1635 static int iss_seq_off = 0; 1636 u_char hash[16]; 1637 u_32_t newiss; 1638 MD5_CTX ctx; 1639 1640 /* 1641 * Compute the base value of the ISS. It is a hash 1642 * of (saddr, sport, daddr, dport, secret). 1643 */ 1644 MD5Init(&ctx); 1645 1646 MD5Update(&ctx, (u_char *) &fin->fin_fi.fi_src, 1647 sizeof(fin->fin_fi.fi_src)); 1648 MD5Update(&ctx, (u_char *) &fin->fin_fi.fi_dst, 1649 sizeof(fin->fin_fi.fi_dst)); 1650 MD5Update(&ctx, (u_char *) &fin->fin_dat, sizeof(fin->fin_dat)); 1651 1652 MD5Update(&ctx, ipf_iss_secret, sizeof(ipf_iss_secret)); 1653 1654 MD5Final(hash, &ctx); 1655 1656 memcpy(&newiss, hash, sizeof(newiss)); 1657 1658 /* 1659 * Now increment our "timer", and add it in to 1660 * the computed value. 1661 * 1662 * XXX Use `addin'? 1663 * XXX TCP_ISSINCR too large to use? 1664 */ 1665 iss_seq_off += 0x00010000; 1666 newiss += iss_seq_off; 1667 return newiss; 1668 #endif 1669 } 1670 1671 1672 /* ------------------------------------------------------------------------ */ 1673 /* Function: ipf_nextipid */ 1674 /* Returns: int - 0 == success, -1 == error (packet should be droppped) */ 1675 /* Parameters: fin(I) - pointer to packet information */ 1676 /* */ 1677 /* Returns the next IPv4 ID to use for this packet. */ 1678 /* ------------------------------------------------------------------------ */ 1679 u_short 1680 ipf_nextipid(fr_info_t *fin) 1681 { 1682 #ifdef USE_MUTEXES 1683 ipf_main_softc_t *softc = fin->fin_main_soft; 1684 #endif 1685 u_short id; 1686 1687 MUTEX_ENTER(&softc->ipf_rw); 1688 id = ipid++; 1689 MUTEX_EXIT(&softc->ipf_rw); 1690 1691 return id; 1692 } 1693 1694 1695 EXTERN_INLINE int 1696 ipf_checkv4sum(fr_info_t *fin) 1697 { 1698 #ifdef M_CSUM_TCP_UDP_BAD 1699 int manual, pflag, cflags, active; 1700 mb_t *m; 1701 1702 if ((fin->fin_flx & FI_NOCKSUM) != 0) 1703 return 0; 1704 1705 if ((fin->fin_flx & FI_SHORT) != 0) 1706 return 1; 1707 1708 if (fin->fin_cksum != FI_CK_NEEDED) 1709 return (fin->fin_cksum > FI_CK_NEEDED) ? 0 : -1; 1710 1711 manual = 0; 1712 m = fin->fin_m; 1713 if (m == NULL) { 1714 manual = 1; 1715 goto skipauto; 1716 } 1717 1718 switch (fin->fin_p) 1719 { 1720 case IPPROTO_UDP : 1721 pflag = M_CSUM_UDPv4; 1722 break; 1723 case IPPROTO_TCP : 1724 pflag = M_CSUM_TCPv4; 1725 break; 1726 default : 1727 pflag = 0; 1728 manual = 1; 1729 break; 1730 } 1731 1732 active = ((struct ifnet *)fin->fin_ifp)->if_csum_flags_rx & pflag; 1733 active |= M_CSUM_TCP_UDP_BAD | M_CSUM_DATA; 1734 cflags = m->m_pkthdr.csum_flags & active; 1735 1736 if (pflag != 0) { 1737 if (cflags == (pflag | M_CSUM_TCP_UDP_BAD)) { 1738 fin->fin_flx |= FI_BAD; 1739 fin->fin_cksum = FI_CK_BAD; 1740 } else if (cflags == (pflag | M_CSUM_DATA)) { 1741 if ((m->m_pkthdr.csum_data ^ 0xffff) != 0) { 1742 fin->fin_flx |= FI_BAD; 1743 fin->fin_cksum = FI_CK_BAD; 1744 } else { 1745 fin->fin_cksum = FI_CK_SUMOK; 1746 } 1747 } else if (cflags == pflag) { 1748 fin->fin_cksum = FI_CK_SUMOK; 1749 } else { 1750 manual = 1; 1751 } 1752 } 1753 skipauto: 1754 if (manual != 0) { 1755 if (ipf_checkl4sum(fin) == -1) { 1756 fin->fin_flx |= FI_BAD; 1757 return -1; 1758 } 1759 } 1760 #else 1761 if (ipf_checkl4sum(fin) == -1) { 1762 fin->fin_flx |= FI_BAD; 1763 return -1; 1764 } 1765 #endif 1766 return 0; 1767 } 1768 1769 1770 #ifdef USE_INET6 1771 EXTERN_INLINE int 1772 ipf_checkv6sum(fr_info_t *fin) 1773 { 1774 # ifdef M_CSUM_TCP_UDP_BAD 1775 int manual, pflag, cflags, active; 1776 mb_t *m; 1777 1778 if ((fin->fin_flx & FI_NOCKSUM) != 0) 1779 return 0; 1780 1781 if ((fin->fin_flx & FI_SHORT) != 0) 1782 return 1; 1783 1784 if (fin->fin_cksum != FI_CK_SUMOK) 1785 return (fin->fin_cksum > FI_CK_NEEDED) ? 0 : -1; 1786 1787 1788 manual = 0; 1789 m = fin->fin_m; 1790 1791 switch (fin->fin_p) 1792 { 1793 case IPPROTO_UDP : 1794 pflag = M_CSUM_UDPv6; 1795 break; 1796 case IPPROTO_TCP : 1797 pflag = M_CSUM_TCPv6; 1798 break; 1799 default : 1800 pflag = 0; 1801 manual = 1; 1802 break; 1803 } 1804 1805 active = ((struct ifnet *)fin->fin_ifp)->if_csum_flags_rx & pflag; 1806 active |= M_CSUM_TCP_UDP_BAD | M_CSUM_DATA; 1807 cflags = m->m_pkthdr.csum_flags & active; 1808 1809 if (pflag != 0) { 1810 if (cflags == (pflag | M_CSUM_TCP_UDP_BAD)) { 1811 fin->fin_flx |= FI_BAD; 1812 } else if (cflags == (pflag | M_CSUM_DATA)) { 1813 if ((m->m_pkthdr.csum_data ^ 0xffff) != 0) 1814 fin->fin_flx |= FI_BAD; 1815 } else if (cflags == pflag) { 1816 ; 1817 } else { 1818 manual = 1; 1819 } 1820 } 1821 if (manual != 0) { 1822 if (ipf_checkl4sum(fin) == -1) { 1823 fin->fin_flx |= FI_BAD; 1824 return -1; 1825 } 1826 } 1827 # else 1828 if (ipf_checkl4sum(fin) == -1) { 1829 fin->fin_flx |= FI_BAD; 1830 return -1; 1831 } 1832 # endif 1833 return 0; 1834 } 1835 #endif /* USE_INET6 */ 1836 1837 1838 size_t 1839 mbufchainlen(struct mbuf *m0) 1840 { 1841 size_t len; 1842 1843 if ((m0->m_flags & M_PKTHDR) != 0) { 1844 len = m0->m_pkthdr.len; 1845 } else { 1846 struct mbuf *m; 1847 1848 for (m = m0, len = 0; m != NULL; m = m->m_next) 1849 len += m->m_len; 1850 } 1851 return len; 1852 } 1853 1854 1855 /* ------------------------------------------------------------------------ */ 1856 /* Function: ipf_pullup */ 1857 /* Returns: NULL == pullup failed, else pointer to protocol header */ 1858 /* Parameters: xmin(I)- pointer to buffer where data packet starts */ 1859 /* fin(I) - pointer to packet information */ 1860 /* len(I) - number of bytes to pullup */ 1861 /* */ 1862 /* Attempt to move at least len bytes (from the start of the buffer) into a */ 1863 /* single buffer for ease of access. Operating system native functions are */ 1864 /* used to manage buffers - if necessary. If the entire packet ends up in */ 1865 /* a single buffer, set the FI_COALESCE flag even though ipf_coalesce() has */ 1866 /* not been called. Both fin_ip and fin_dp are updated before exiting _IF_ */ 1867 /* and ONLY if the pullup succeeds. */ 1868 /* */ 1869 /* We assume that 'xmin' is a pointer to a buffer that is part of the chain */ 1870 /* of buffers that starts at *fin->fin_mp. */ 1871 /* ------------------------------------------------------------------------ */ 1872 void * 1873 ipf_pullup(mb_t *xmin, fr_info_t *fin, int len) 1874 { 1875 int dpoff, ipoff; 1876 mb_t *m = xmin; 1877 char *ip; 1878 1879 if (m == NULL) 1880 return NULL; 1881 1882 ip = (char *)fin->fin_ip; 1883 if ((fin->fin_flx & FI_COALESCE) != 0) 1884 return ip; 1885 1886 ipoff = fin->fin_ipoff; 1887 if (fin->fin_dp != NULL) 1888 dpoff = (char *)fin->fin_dp - (char *)ip; 1889 else 1890 dpoff = 0; 1891 1892 if (M_LEN(m) < len) { 1893 mb_t *n = *fin->fin_mp; 1894 /* 1895 * Assume that M_PKTHDR is set and just work with what is left 1896 * rather than check.. 1897 * Should not make any real difference, anyway. 1898 */ 1899 if (m != n) { 1900 /* 1901 * Record the mbuf that points to the mbuf that we're 1902 * about to go to work on so that we can update the 1903 * m_next appropriately later. 1904 */ 1905 for (; n->m_next != m; n = n->m_next) 1906 ; 1907 } else { 1908 n = NULL; 1909 } 1910 1911 #ifdef MHLEN 1912 if (len > MHLEN) 1913 #else 1914 if (len > MLEN) 1915 #endif 1916 { 1917 #ifdef HAVE_M_PULLDOWN 1918 if (m_pulldown(m, 0, len, NULL) == NULL) 1919 m = NULL; 1920 #else 1921 FREE_MB_T(*fin->fin_mp); 1922 m = NULL; 1923 n = NULL; 1924 #endif 1925 } else 1926 { 1927 m = m_pullup(m, len); 1928 } 1929 if (n != NULL) 1930 n->m_next = m; 1931 if (m == NULL) { 1932 /* 1933 * When n is non-NULL, it indicates that m pointed to 1934 * a sub-chain (tail) of the mbuf and that the head 1935 * of this chain has not yet been free'd. 1936 */ 1937 if (n != NULL) { 1938 FREE_MB_T(*fin->fin_mp); 1939 } 1940 1941 *fin->fin_mp = NULL; 1942 fin->fin_m = NULL; 1943 return NULL; 1944 } 1945 1946 if (n == NULL) 1947 *fin->fin_mp = m; 1948 1949 while (M_LEN(m) == 0) { 1950 m = m->m_next; 1951 } 1952 fin->fin_m = m; 1953 ip = MTOD(m, char *) + ipoff; 1954 1955 fin->fin_ip = (ip_t *)ip; 1956 if (fin->fin_dp != NULL) 1957 fin->fin_dp = (char *)fin->fin_ip + dpoff; 1958 if (fin->fin_fraghdr != NULL) 1959 fin->fin_fraghdr = (char *)ip + 1960 ((char *)fin->fin_fraghdr - 1961 (char *)fin->fin_ip); 1962 } 1963 1964 if (len == fin->fin_plen) 1965 fin->fin_flx |= FI_COALESCE; 1966 return ip; 1967 } 1968 1969 1970 int 1971 ipf_inject(fr_info_t *fin, mb_t *m) 1972 { 1973 int error; 1974 1975 if (fin->fin_out == 0) { 1976 if (__predict_false(!pktq_enqueue(ip_pktq, m, 0))) { 1977 FREE_MB_T(m); 1978 error = ENOBUFS; 1979 } else { 1980 error = 0; 1981 } 1982 } else { 1983 error = ip_output(m, NULL, NULL, IP_FORWARDING, NULL, NULL); 1984 } 1985 return error; 1986 } 1987 1988 1989 u_32_t 1990 ipf_random(void) 1991 { 1992 int number; 1993 1994 #ifdef _CPRNG_H 1995 number = cprng_fast32(); 1996 #else 1997 number = arc4random(); 1998 #endif 1999 return number; 2000 } 2001 2002 2003 /* 2004 * routines below for saving IP headers to buffer 2005 */ 2006 static int ipfopen(dev_t dev, int flags 2007 #if (NetBSD >= 199511) 2008 , int devtype, PROC_T *p 2009 #endif 2010 ) 2011 { 2012 u_int unit = GET_MINOR(dev); 2013 int error; 2014 2015 if (IPL_LOGMAX < unit) { 2016 error = ENXIO; 2017 } else { 2018 switch (unit) 2019 { 2020 case IPL_LOGIPF : 2021 case IPL_LOGNAT : 2022 case IPL_LOGSTATE : 2023 case IPL_LOGAUTH : 2024 case IPL_LOGLOOKUP : 2025 case IPL_LOGSYNC : 2026 #ifdef IPFILTER_SCAN 2027 case IPL_LOGSCAN : 2028 #endif 2029 error = 0; 2030 break; 2031 default : 2032 error = ENXIO; 2033 break; 2034 } 2035 } 2036 #if (__NetBSD_Version__ >= 799003000) 2037 if (error == 0) { 2038 mutex_enter(&ipf_ref_mutex); 2039 ipf_active = 1; 2040 mutex_exit(&ipf_ref_mutex); 2041 } 2042 #endif 2043 return error; 2044 } 2045 2046 2047 static int ipfclose(dev_t dev, int flags 2048 #if (NetBSD >= 199511) 2049 , int devtype, PROC_T *p 2050 #endif 2051 ) 2052 { 2053 u_int unit = GET_MINOR(dev); 2054 2055 if (IPL_LOGMAX < unit) 2056 return ENXIO; 2057 else { 2058 #if (__NetBSD_Version__ >= 799003000) 2059 mutex_enter(&ipf_ref_mutex); 2060 ipf_active = 0; 2061 mutex_exit(&ipf_ref_mutex); 2062 #endif 2063 return 0; 2064 } 2065 } 2066 2067 /* 2068 * ipfread/ipflog 2069 * both of these must operate with at least splnet() lest they be 2070 * called during packet processing and cause an inconsistancy to appear in 2071 * the filter lists. 2072 */ 2073 static int ipfread(dev_t dev, struct uio *uio, int ioflag) 2074 { 2075 2076 if (ipfmain.ipf_running < 1) { 2077 ipfmain.ipf_interror = 130006; 2078 return EIO; 2079 } 2080 2081 if (GET_MINOR(dev) == IPL_LOGSYNC) 2082 return ipf_sync_read(&ipfmain, uio); 2083 2084 #ifdef IPFILTER_LOG 2085 return ipf_log_read(&ipfmain, GET_MINOR(dev), uio); 2086 #else 2087 ipfmain.ipf_interror = 130007; 2088 return ENXIO; 2089 #endif 2090 } 2091 2092 2093 /* 2094 * ipfwrite 2095 * both of these must operate with at least splnet() lest they be 2096 * called during packet processing and cause an inconsistancy to appear in 2097 * the filter lists. 2098 */ 2099 static int ipfwrite(dev_t dev, struct uio *uio, int ioflag) 2100 { 2101 2102 if (ipfmain.ipf_running < 1) { 2103 ipfmain.ipf_interror = 130008; 2104 return EIO; 2105 } 2106 2107 if (GET_MINOR(dev) == IPL_LOGSYNC) 2108 return ipf_sync_write(&ipfmain, uio); 2109 ipfmain.ipf_interror = 130009; 2110 return ENXIO; 2111 } 2112 2113 2114 static int ipfpoll(dev_t dev, int events, PROC_T *p) 2115 { 2116 u_int unit = GET_MINOR(dev); 2117 int revents = 0; 2118 2119 if (IPL_LOGMAX < unit) { 2120 ipfmain.ipf_interror = 130010; 2121 return ENXIO; 2122 } 2123 2124 switch (unit) 2125 { 2126 case IPL_LOGIPF : 2127 case IPL_LOGNAT : 2128 case IPL_LOGSTATE : 2129 #ifdef IPFILTER_LOG 2130 if ((events & (POLLIN | POLLRDNORM)) && 2131 ipf_log_canread(&ipfmain, unit)) 2132 revents |= events & (POLLIN | POLLRDNORM); 2133 #endif 2134 break; 2135 case IPL_LOGAUTH : 2136 if ((events & (POLLIN | POLLRDNORM)) && 2137 ipf_auth_waiting(&ipfmain)) 2138 revents |= events & (POLLIN | POLLRDNORM); 2139 break; 2140 case IPL_LOGSYNC : 2141 if ((events & (POLLIN | POLLRDNORM)) && 2142 ipf_sync_canread(&ipfmain)) 2143 revents |= events & (POLLIN | POLLRDNORM); 2144 if ((events & (POLLOUT | POLLWRNORM)) && 2145 ipf_sync_canwrite(&ipfmain)) 2146 revents |= events & (POLLOUT | POLLWRNORM); 2147 break; 2148 case IPL_LOGSCAN : 2149 case IPL_LOGLOOKUP : 2150 default : 2151 break; 2152 } 2153 2154 if ((revents == 0) && (((events & (POLLIN|POLLRDNORM)) != 0))) 2155 selrecord(p, &ipfmain.ipf_selwait[unit]); 2156 return revents; 2157 } 2158 2159 u_int 2160 ipf_pcksum(fr_info_t *fin, int hlen, u_int sum) 2161 { 2162 struct mbuf *m; 2163 u_int sum2; 2164 int off; 2165 2166 m = fin->fin_m; 2167 off = (char *)fin->fin_dp - (char *)fin->fin_ip; 2168 m->m_data += hlen; 2169 m->m_len -= hlen; 2170 sum2 = in_cksum(fin->fin_m, fin->fin_plen - off); 2171 m->m_len += hlen; 2172 m->m_data -= hlen; 2173 2174 /* 2175 * Both sum and sum2 are partial sums, so combine them together. 2176 */ 2177 sum += ~sum2 & 0xffff; 2178 while (sum > 0xffff) 2179 sum = (sum & 0xffff) + (sum >> 16); 2180 sum2 = ~sum & 0xffff; 2181 return sum2; 2182 } 2183 2184 #if (__NetBSD_Version__ >= 799003000) 2185 2186 /* NetBSD module interface */ 2187 2188 MODULE(MODULE_CLASS_DRIVER, ipl, "bpf_filter"); 2189 2190 static int ipl_init(void *); 2191 static int ipl_fini(void *); 2192 static int ipl_modcmd(modcmd_t, void *); 2193 2194 #ifdef _MODULE 2195 static devmajor_t ipl_cmaj = -1, ipl_bmaj = -1; 2196 #endif 2197 2198 static int 2199 ipl_modcmd(modcmd_t cmd, void *opaque) 2200 { 2201 2202 switch (cmd) { 2203 case MODULE_CMD_INIT: 2204 return ipl_init(opaque); 2205 case MODULE_CMD_FINI: 2206 return ipl_fini(opaque); 2207 default: 2208 return ENOTTY; 2209 } 2210 } 2211 2212 static int 2213 ipl_init(void *opaque) 2214 { 2215 int error; 2216 2217 ipf_listener = kauth_listen_scope(KAUTH_SCOPE_NETWORK, 2218 ipf_listener_cb, NULL); 2219 2220 if ((error = ipf_load_all()) != 0) 2221 return error; 2222 2223 if (ipf_create_all(&ipfmain) == NULL) { 2224 ipf_unload_all(); 2225 return ENODEV; 2226 } 2227 2228 /* Initialize our mutex and reference count */ 2229 mutex_init(&ipf_ref_mutex, MUTEX_DEFAULT, IPL_NONE); 2230 ipf_active = 0; 2231 2232 #ifdef _MODULE 2233 /* 2234 * Insert ourself into the cdevsw list. 2235 */ 2236 error = devsw_attach("ipl", NULL, &ipl_bmaj, &ipl_cdevsw, &ipl_cmaj); 2237 if (error) 2238 ipl_fini(opaque); 2239 #endif 2240 2241 return error; 2242 } 2243 2244 static int 2245 ipl_fini(void *opaque) 2246 { 2247 2248 #ifdef _MODULE 2249 (void)devsw_detach(NULL, &ipl_cdevsw); 2250 #endif 2251 2252 /* 2253 * Grab the mutex, verify that there are no references 2254 * and that there are no running filters. If either 2255 * of these exists, reinsert our cdevsw entry and return 2256 * an error. 2257 */ 2258 mutex_enter(&ipf_ref_mutex); 2259 if (ipf_active != 0 || ipfmain.ipf_running > 0) { 2260 #ifdef _MODULE 2261 (void)devsw_attach("ipl", NULL, &ipl_bmaj, 2262 &ipl_cdevsw, &ipl_cmaj); 2263 #endif 2264 mutex_exit(&ipf_ref_mutex); 2265 return EBUSY; 2266 } 2267 2268 /* Clean up the rest of our state before being unloaded */ 2269 2270 mutex_exit(&ipf_ref_mutex); 2271 mutex_destroy(&ipf_ref_mutex); 2272 ipf_destroy_all(&ipfmain); 2273 ipf_unload_all(); 2274 kauth_unlisten_scope(ipf_listener); 2275 2276 return 0; 2277 } 2278 #endif /* (__NetBSD_Version__ >= 799003000) */ 2279
Indexes created Sat Oct 11 08:10:02 GMT 2025