ip_fil_netbsd.c revision 1.22.4.2
1 /* $NetBSD: ip_fil_netbsd.c,v 1.22.4.2 2017/04/29 09:17:59 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 1.22.4.2 2017/04/29 09:17:59 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__ >= 799007100) 27 # include <sys/localcount.h> 28 # endif 29 # if (__NetBSD_Version__ >= 799003000) 30 # ifdef _KERNEL_OPT 31 # include "opt_ipsec.h" 32 # endif 33 # else 34 # include "opt_ipsec.h" 35 # endif 36 #endif 37 #include <sys/errno.h> 38 #include <sys/types.h> 39 #include <sys/file.h> 40 #include <sys/ioctl.h> 41 #include <sys/time.h> 42 #include <sys/systm.h> 43 #include <sys/select.h> 44 #if (NetBSD > 199609) 45 # include <sys/dirent.h> 46 #else 47 # include <sys/dir.h> 48 #endif 49 #if (__NetBSD_Version__ >= 599005900) 50 # include <sys/cprng.h> 51 #endif 52 #include <sys/mbuf.h> 53 #include <sys/protosw.h> 54 #include <sys/socket.h> 55 #include <sys/poll.h> 56 #if (__NetBSD_Version__ >= 399002000) 57 # include <sys/kauth.h> 58 #endif 59 #if (__NetBSD_Version__ >= 799003000) 60 #include <sys/module.h> 61 #include <sys/mutex.h> 62 #endif 63 #if (__NetBSD_Version__ >= 799003300) 64 #include <sys/localcount.h> 65 #endif 66 67 #include <net/if.h> 68 #include <net/route.h> 69 #include <netinet/in.h> 70 #include <netinet/in_var.h> 71 #include <netinet/in_systm.h> 72 #include <netinet/ip.h> 73 #include <netinet/ip_var.h> 74 #include <netinet/tcp.h> 75 #if __NetBSD_Version__ >= 105190000 /* 1.5T */ 76 # include <netinet/tcp_timer.h> 77 # include <netinet/tcp_var.h> 78 #endif 79 #include <netinet/udp.h> 80 #include <netinet/tcpip.h> 81 #include <netinet/ip_icmp.h> 82 #include "netinet/ip_compat.h" 83 #ifdef USE_INET6 84 # include <netinet/icmp6.h> 85 # if (__NetBSD_Version__ >= 106000000) 86 # include <netinet6/nd6.h> 87 # endif 88 #endif 89 #include "netinet/ip_fil.h" 90 #include "netinet/ip_nat.h" 91 #include "netinet/ip_frag.h" 92 #include "netinet/ip_state.h" 93 #include "netinet/ip_proxy.h" 94 #include "netinet/ip_auth.h" 95 #include "netinet/ip_sync.h" 96 #include "netinet/ip_lookup.h" 97 #include "netinet/ip_dstlist.h" 98 #ifdef IPFILTER_SCAN 99 #include "netinet/ip_scan.h" 100 #endif 101 #include <sys/md5.h> 102 #include <sys/kernel.h> 103 #include <sys/conf.h> 104 #ifdef INET 105 extern int ip_optcopy (struct ip *, struct ip *); 106 #endif 107 108 #ifdef IPFILTER_M_IPFILTER 109 MALLOC_DEFINE(M_IPFILTER, "IP Filter", "IP Filter packet filter data structures"); 110 #endif 111 112 #if __NetBSD_Version__ >= 105009999 113 # define csuminfo csum_flags 114 #endif 115 116 #if __NetBSD_Version__ < 200000000 117 extern struct protosw inetsw[]; 118 #endif 119 120 #if (__NetBSD_Version__ >= 599002000) 121 static kauth_listener_t ipf_listener; 122 #endif 123 124 #if (__NetBSD_Version__ < 399001400) 125 extern int ip6_getpmtu (struct route_in6 *, struct route_in6 *, 126 struct ifnet *, struct in6_addr *, u_long *, 127 int *); 128 #endif 129 #if (NetBSD >= 199511) 130 static int ipfopen(dev_t dev, int flags, int devtype, PROC_T *p); 131 static int ipfclose(dev_t dev, int flags, int devtype, PROC_T *p); 132 #else 133 # if (__NetBSD_Version__ >= 399001400) 134 static int ipfopen(dev_t dev, int flags, struct lwp *); 135 static int ipfclose(dev_t dev, int flags, struct lwp *); 136 # else 137 static int ipfopen(dev_t dev, int flags); 138 static int ipfclose(dev_t dev, int flags); 139 # endif /* __NetBSD_Version__ >= 399001400 */ 140 #endif 141 static int ipfread(dev_t, struct uio *, int ioflag); 142 static int ipfwrite(dev_t, struct uio *, int ioflag); 143 static int ipfpoll(dev_t, int events, PROC_T *); 144 static void ipf_timer_func(void *ptr); 145 146 const struct cdevsw ipl_cdevsw = { 147 #if (__NetBSD_Version__ >= 799007100) 148 DEVSW_MODULE_INIT 149 #endif 150 .d_open = ipfopen, 151 .d_close = ipfclose, 152 .d_read = ipfread, 153 .d_write = ipfwrite, 154 .d_ioctl = ipfioctl, 155 .d_stop = nostop, 156 .d_tty = notty, 157 .d_poll = ipfpoll, 158 .d_mmap = nommap, 159 #if (__NetBSD_Version__ >= 200000000) 160 .d_kqfilter = nokqfilter, 161 #endif 162 .d_discard = nodiscard, 163 #ifdef D_OTHER 164 .d_flag = D_OTHER 165 #else 166 .d_flag = 0 167 #endif 168 }; 169 #if (__NetBSD_Version__ >= 799003000) 170 kmutex_t ipf_ref_mutex; 171 int ipf_active; 172 #endif 173 174 ipf_main_softc_t ipfmain; 175 176 static u_short ipid = 0; 177 static int (*ipf_savep)(void *, ip_t *, int, void *, int, struct mbuf **); 178 static int ipf_send_ip(fr_info_t *, mb_t *); 179 #ifdef USE_INET6 180 static int ipf_fastroute6(struct mbuf *, struct mbuf **, 181 fr_info_t *, frdest_t *); 182 #endif 183 184 #if defined(NETBSD_PF) 185 # include <net/pfil.h> 186 /* 187 * We provide the ipf_checkp name just to minimize changes later. 188 */ 189 int (*ipf_checkp)(void *, ip_t *ip, int hlen, void *ifp, int out, mb_t **mp); 190 #endif /* NETBSD_PF */ 191 192 #if defined(__NetBSD_Version__) && (__NetBSD_Version__ >= 105110000) 193 # include <net/pfil.h> 194 195 static int ipf_check_wrapper(void *, struct mbuf **, struct ifnet *, int ); 196 197 static int 198 ipf_check_wrapper(void *arg, struct mbuf **mp, struct ifnet *ifp, int dir) 199 { 200 struct ip *ip; 201 int rv, hlen; 202 203 #if __NetBSD_Version__ >= 200080000 204 /* 205 * ensure that mbufs are writable beforehand 206 * as it's assumed by ipf code. 207 * XXX inefficient 208 */ 209 int error = m_makewritable(mp, 0, M_COPYALL, M_DONTWAIT); 210 211 if (error) { 212 m_freem(*mp); 213 *mp = NULL; 214 return error; 215 } 216 #endif 217 ip = mtod(*mp, struct ip *); 218 hlen = ip->ip_hl << 2; 219 220 #ifdef INET 221 #if defined(M_CSUM_TCPv4) 222 /* 223 * If the packet is out-bound, we can't delay checksums 224 * here. For in-bound, the checksum has already been 225 * validated. 226 */ 227 if (dir == PFIL_OUT) { 228 if ((*mp)->m_pkthdr.csum_flags & (M_CSUM_TCPv4|M_CSUM_UDPv4)) { 229 in_delayed_cksum(*mp); 230 (*mp)->m_pkthdr.csum_flags &= 231 ~(M_CSUM_TCPv4|M_CSUM_UDPv4); 232 } 233 } 234 #endif /* M_CSUM_TCPv4 */ 235 #endif /* INET */ 236 237 /* 238 * Note, we don't need to update the checksum, because 239 * it has already been verified. 240 */ 241 rv = ipf_check(&ipfmain, ip, hlen, ifp, (dir == PFIL_OUT), mp); 242 243 return (rv); 244 } 245 246 # ifdef USE_INET6 247 # include <netinet/ip6.h> 248 249 static int ipf_check_wrapper6(void *, struct mbuf **, struct ifnet *, int ); 250 251 static int 252 ipf_check_wrapper6(void *arg, struct mbuf **mp, struct ifnet *ifp, int dir) 253 { 254 #if defined(INET6) 255 # if defined(M_CSUM_TCPv6) && (__NetBSD_Version__ > 200000000) 256 /* 257 * If the packet is out-bound, we can't delay checksums 258 * here. For in-bound, the checksum has already been 259 * validated. 260 */ 261 if (dir == PFIL_OUT) { 262 if ((*mp)->m_pkthdr.csum_flags & (M_CSUM_TCPv6|M_CSUM_UDPv6)) { 263 # if (__NetBSD_Version__ > 399000600) 264 in6_delayed_cksum(*mp); 265 # endif 266 (*mp)->m_pkthdr.csum_flags &= ~(M_CSUM_TCPv6| 267 M_CSUM_UDPv6); 268 } 269 } 270 # endif 271 #endif /* INET6 */ 272 273 return (ipf_check(&ipfmain, mtod(*mp, struct ip *), sizeof(struct ip6_hdr), 274 ifp, (dir == PFIL_OUT), mp)); 275 } 276 # endif 277 278 279 # if defined(PFIL_TYPE_IFNET) && defined(PFIL_IFNET) 280 281 # if (__NetBSD_Version__ >= 799000400) 282 283 static void ipf_pfilsync(void *, unsigned long, void *); 284 285 static void 286 ipf_pfilsync(void *hdr, unsigned long cmd, void *arg2) 287 { 288 /* 289 * The interface pointer is useless for create (we have nothing to 290 * compare it to) and at detach, the interface name is still in the 291 * list of active NICs (albeit, down, but that's not any real 292 * indicator) and doing ifunit() on the name will still return the 293 * pointer, so it's not much use then, either. 294 */ 295 ipf_sync(&ipfmain, NULL); 296 } 297 298 # else 299 300 static int ipf_pfilsync(void *, struct mbuf **, struct ifnet *, int); 301 302 static int 303 ipf_pfilsync(void *hdr, struct mbuf **mp, struct ifnet *ifp, int dir) 304 { 305 ipf_sync(&ipfmain, NULL); 306 return 0; 307 } 308 309 # endif 310 # endif 311 312 #endif /* __NetBSD_Version__ >= 105110000 */ 313 314 315 #if defined(IPFILTER_LKM) 316 int 317 ipf_identify(s) 318 char *s; 319 { 320 if (strcmp(s, "ipl") == 0) 321 return 1; 322 return 0; 323 } 324 #endif /* IPFILTER_LKM */ 325 326 #if (__NetBSD_Version__ >= 599002000) 327 static int 328 ipf_listener_cb(kauth_cred_t cred, kauth_action_t action, void *cookie, 329 void *arg0, void *arg1, void *arg2, void *arg3) 330 { 331 int result; 332 enum kauth_network_req req; 333 334 result = KAUTH_RESULT_DEFER; 335 req = (enum kauth_network_req)arg0; 336 337 if (action != KAUTH_NETWORK_FIREWALL) 338 return result; 339 340 /* These must have came from device context. */ 341 if ((req == KAUTH_REQ_NETWORK_FIREWALL_FW) || 342 (req == KAUTH_REQ_NETWORK_FIREWALL_NAT)) 343 result = KAUTH_RESULT_ALLOW; 344 345 return result; 346 } 347 #endif 348 349 /* 350 * Try to detect the case when compiling for NetBSD with pseudo-device 351 */ 352 void 353 ipfilterattach(int count) 354 { 355 356 #if (__NetBSD_Version__ >= 799003000) 357 return; 358 #else 359 #if (__NetBSD_Version__ >= 599002000) 360 ipf_listener = kauth_listen_scope(KAUTH_SCOPE_NETWORK, 361 ipf_listener_cb, NULL); 362 #endif 363 364 if (ipf_load_all() == 0) 365 (void) ipf_create_all(&ipfmain); 366 #endif 367 } 368 369 370 int 371 ipfattach(ipf_main_softc_t *softc) 372 { 373 SPL_INT(s); 374 #if (__NetBSD_Version__ >= 499005500) 375 int i; 376 #endif 377 #if defined(NETBSD_PF) && (__NetBSD_Version__ >= 104200000) 378 int error = 0; 379 # if defined(__NetBSD_Version__) && (__NetBSD_Version__ >= 105110000) 380 pfil_head_t *ph_inet; 381 # ifdef USE_INET6 382 pfil_head_t *ph_inet6; 383 # endif 384 # if defined(PFIL_TYPE_IFNET) && defined(PFIL_IFNET) 385 pfil_head_t *ph_ifsync; 386 # endif 387 # endif 388 #endif 389 390 SPL_NET(s); 391 if ((softc->ipf_running > 0) || (ipf_checkp == ipf_check)) { 392 printf("IP Filter: already initialized\n"); 393 SPL_X(s); 394 IPFERROR(130017); 395 return EBUSY; 396 } 397 398 if (ipf_init_all(softc) < 0) { 399 SPL_X(s); 400 IPFERROR(130015); 401 return EIO; 402 } 403 404 #ifdef NETBSD_PF 405 # if (__NetBSD_Version__ >= 104200000) 406 # if __NetBSD_Version__ >= 105110000 407 ph_inet = pfil_head_get(PFIL_TYPE_AF, (void *)AF_INET); 408 # ifdef USE_INET6 409 ph_inet6 = pfil_head_get(PFIL_TYPE_AF, (void *)AF_INET6); 410 # endif 411 # if defined(PFIL_TYPE_IFNET) && defined(PFIL_IFNET) 412 ph_ifsync = pfil_head_get(PFIL_TYPE_IFNET, 0); 413 # endif 414 415 if (ph_inet == NULL 416 # ifdef USE_INET6 417 && ph_inet6 == NULL 418 # endif 419 # if defined(PFIL_TYPE_IFNET) && defined(PFIL_IFNET) 420 && ph_ifsync == NULL 421 # endif 422 ) { 423 SPL_X(s); 424 IPFERROR(130016); 425 return ENODEV; 426 } 427 428 if (ph_inet != NULL) 429 error = pfil_add_hook((void *)ipf_check_wrapper, NULL, 430 PFIL_IN|PFIL_OUT, ph_inet); 431 else 432 error = 0; 433 # else 434 error = pfil_add_hook((void *)ipf_check, PFIL_IN|PFIL_OUT, 435 &inetsw[ip_protox[IPPROTO_IP]].pr_pfh); 436 # endif 437 if (error) { 438 IPFERROR(130013); 439 goto pfil_error; 440 } 441 # else 442 pfil_add_hook((void *)ipf_check, PFIL_IN|PFIL_OUT); 443 # endif 444 445 # ifdef USE_INET6 446 # if __NetBSD_Version__ >= 105110000 447 if (ph_inet6 != NULL) 448 error = pfil_add_hook((void *)ipf_check_wrapper6, NULL, 449 PFIL_IN|PFIL_OUT, ph_inet6); 450 else 451 error = 0; 452 if (error) { 453 pfil_remove_hook((void *)ipf_check_wrapper6, NULL, 454 PFIL_IN|PFIL_OUT, ph_inet6); 455 ipfmain.ipf_interror = 130014; 456 goto pfil_error; 457 } 458 # else 459 error = pfil_add_hook((void *)ipf_check, PFIL_IN|PFIL_OUT, 460 &inetsw[ip_protox[IPPROTO_IPV6]].pr_pfh); 461 if (error) { 462 pfil_remove_hook((void *)ipf_check, PFIL_IN|PFIL_OUT, 463 &inetsw[ip_protox[IPPROTO_IP]].pr_pfh); 464 IPFERROR(130014); 465 goto pfil_error; 466 } 467 # endif 468 # endif 469 470 # if defined(PFIL_TYPE_IFNET) && defined(PFIL_IFNET) 471 if (ph_ifsync != NULL) 472 #if (__NetBSD_Version__ >= 799000400) 473 (void) pfil_add_ihook((void *)ipf_pfilsync, NULL, 474 PFIL_IFNET, ph_ifsync); 475 #else 476 (void) pfil_add_hook((void *)ipf_pfilsync, NULL, 477 PFIL_IFNET, ph_ifsync); 478 #endif 479 # endif 480 #endif 481 482 #if (__NetBSD_Version__ >= 499005500) 483 for (i = 0; i < IPL_LOGSIZE; i++) 484 selinit(&ipfmain.ipf_selwait[i]); 485 #else 486 bzero((char *)ipfmain.ipf_selwait, sizeof(ipfmain.ipf_selwait)); 487 #endif 488 ipf_savep = ipf_checkp; 489 ipf_checkp = ipf_check; 490 491 #ifdef INET 492 if (softc->ipf_control_forwarding & 1) 493 ipforwarding = 1; 494 #endif 495 496 ipid = 0; 497 498 SPL_X(s); 499 500 #if (__NetBSD_Version__ >= 104010000) 501 # if (__NetBSD_Version__ >= 499002000) 502 callout_init(&softc->ipf_slow_ch, 0); 503 # else 504 callout_init(&softc->ipf_slow_ch); 505 # endif 506 callout_reset(&softc->ipf_slow_ch, (hz / IPF_HZ_DIVIDE) * IPF_HZ_MULT, 507 ipf_timer_func, softc); 508 #else 509 timeout(ipf_timer_func, softc, (hz / IPF_HZ_DIVIDE) * IPF_HZ_MULT); 510 #endif 511 512 return 0; 513 514 #if __NetBSD_Version__ >= 105110000 515 pfil_error: 516 SPL_X(s); 517 ipf_fini_all(softc); 518 return error; 519 #endif 520 } 521 522 static void 523 ipf_timer_func(void *ptr) 524 { 525 ipf_main_softc_t *softc = ptr; 526 SPL_INT(s); 527 528 SPL_NET(s); 529 READ_ENTER(&softc->ipf_global); 530 531 if (softc->ipf_running > 0) 532 ipf_slowtimer(softc); 533 534 if (softc->ipf_running == -1 || softc->ipf_running == 1) { 535 #if NETBSD_GE_REV(104240000) 536 callout_reset(&softc->ipf_slow_ch, hz / 2, 537 ipf_timer_func, softc); 538 #else 539 timeout(ipf_timer_func, softc, 540 (hz / IPF_HZ_DIVIDE) * IPF_HZ_MULT); 541 #endif 542 } 543 RWLOCK_EXIT(&softc->ipf_global); 544 SPL_X(s); 545 } 546 547 548 /* 549 * Disable the filter by removing the hooks from the IP input/output 550 * stream. 551 */ 552 int 553 ipfdetach(ipf_main_softc_t *softc) 554 { 555 SPL_INT(s); 556 #if (__NetBSD_Version__ >= 499005500) 557 int i; 558 #endif 559 #if defined(NETBSD_PF) && (__NetBSD_Version__ >= 104200000) 560 int error = 0; 561 # if __NetBSD_Version__ >= 105150000 562 pfil_head_t *ph_inet = pfil_head_get(PFIL_TYPE_AF, (void *)AF_INET); 563 # ifdef USE_INET6 564 pfil_head_t *ph_inet6 = pfil_head_get(PFIL_TYPE_AF, (void *)AF_INET6); 565 # endif 566 # if defined(PFIL_TYPE_IFNET) && defined(PFIL_IFNET) 567 struct pfil_head *ph_ifsync = pfil_head_get(PFIL_TYPE_IFNET, 0); 568 # endif 569 # endif 570 #endif 571 572 SPL_NET(s); 573 574 #if (__NetBSD_Version__ >= 104010000) 575 if (softc->ipf_running > 0) 576 callout_stop(&softc->ipf_slow_ch); 577 #else 578 untimeout(ipf_slowtimer, NULL); 579 #endif /* NetBSD */ 580 581 ipf_checkp = ipf_savep; 582 (void) ipf_flush(softc, IPL_LOGIPF, FR_INQUE|FR_OUTQUE|FR_INACTIVE); 583 (void) ipf_flush(softc, IPL_LOGIPF, FR_INQUE|FR_OUTQUE); 584 585 #ifdef INET 586 if (softc->ipf_control_forwarding & 2) 587 ipforwarding = 0; 588 #endif 589 590 #ifdef NETBSD_PF 591 # if (__NetBSD_Version__ >= 104200000) 592 # if __NetBSD_Version__ >= 105110000 593 # if defined(PFIL_TYPE_IFNET) && defined(PFIL_IFNET) 594 (void) pfil_remove_hook((void *)ipf_pfilsync, NULL, 595 PFIL_IFNET, ph_ifsync); 596 # endif 597 598 if (ph_inet != NULL) 599 error = pfil_remove_hook((void *)ipf_check_wrapper, NULL, 600 PFIL_IN|PFIL_OUT, ph_inet); 601 else 602 error = 0; 603 # else 604 error = pfil_remove_hook((void *)ipf_check, PFIL_IN|PFIL_OUT, 605 &inetsw[ip_protox[IPPROTO_IP]].pr_pfh); 606 # endif 607 if (error) { 608 SPL_X(s); 609 IPFERROR(130011); 610 return error; 611 } 612 # else 613 pfil_remove_hook((void *)ipf_check, PFIL_IN|PFIL_OUT); 614 # endif 615 # ifdef USE_INET6 616 # if __NetBSD_Version__ >= 105110000 617 if (ph_inet6 != NULL) 618 error = pfil_remove_hook((void *)ipf_check_wrapper6, NULL, 619 PFIL_IN|PFIL_OUT, ph_inet6); 620 else 621 error = 0; 622 # else 623 error = pfil_remove_hook((void *)ipf_check, PFIL_IN|PFIL_OUT, 624 &inetsw[ip_protox[IPPROTO_IPV6]].pr_pfh); 625 # endif 626 if (error) { 627 SPL_X(s); 628 IPFERROR(130012); 629 return error; 630 } 631 # endif 632 #endif 633 SPL_X(s); 634 635 #if (__NetBSD_Version__ >= 499005500) 636 for (i = 0; i < IPL_LOGSIZE; i++) 637 seldestroy(&ipfmain.ipf_selwait[i]); 638 #endif 639 640 ipf_fini_all(softc); 641 642 return 0; 643 } 644 645 646 /* 647 * Filter ioctl interface. 648 */ 649 int 650 ipfioctl(dev_t dev, u_long cmd, 651 #if (__NetBSD_Version__ >= 499001000) 652 void *data, 653 #else 654 caddr_t data, 655 #endif 656 int mode 657 #if (NetBSD >= 199511) 658 # if (__NetBSD_Version__ >= 399001400) 659 , struct lwp *p 660 # if (__NetBSD_Version__ >= 399002000) 661 # define UID(l) kauth_cred_getuid((l)->l_cred) 662 # else 663 # define UID(l) ((l)->l_proc->p_cred->p_ruid) 664 # endif 665 # else 666 , struct proc *p 667 # define UID(p) ((p)->p_cred->p_ruid) 668 # endif 669 #endif 670 ) 671 { 672 int error = 0, unit = 0; 673 SPL_INT(s); 674 675 #if (__NetBSD_Version__ >= 399002000) 676 if ((mode & FWRITE) && 677 kauth_authorize_network(p->l_cred, KAUTH_NETWORK_FIREWALL, 678 KAUTH_REQ_NETWORK_FIREWALL_FW, NULL, 679 NULL, NULL)) { 680 ipfmain.ipf_interror = 130005; 681 return EPERM; 682 } 683 #else 684 if ((securelevel >= 2) && (mode & FWRITE)) { 685 ipfmain.ipf_interror = 130001; 686 return EPERM; 687 } 688 #endif 689 690 unit = GET_MINOR(dev); 691 if ((IPL_LOGMAX < unit) || (unit < 0)) { 692 ipfmain.ipf_interror = 130002; 693 return ENXIO; 694 } 695 696 if (ipfmain.ipf_running <= 0) { 697 if (unit != IPL_LOGIPF && cmd != SIOCIPFINTERROR) { 698 ipfmain.ipf_interror = 130003; 699 return EIO; 700 } 701 if (cmd != SIOCIPFGETNEXT && cmd != SIOCIPFGET && 702 cmd != SIOCIPFSET && cmd != SIOCFRENB && 703 cmd != SIOCGETFS && cmd != SIOCGETFF && 704 cmd != SIOCIPFINTERROR) { 705 ipfmain.ipf_interror = 130004; 706 return EIO; 707 } 708 } 709 710 SPL_NET(s); 711 712 error = ipf_ioctlswitch(&ipfmain, unit, data, cmd, mode, UID(p), p); 713 if (error != -1) { 714 SPL_X(s); 715 return error; 716 } 717 718 SPL_X(s); 719 return error; 720 } 721 722 723 /* 724 * ipf_send_reset - this could conceivably be a call to tcp_respond(), but that 725 * requires a large amount of setting up and isn't any more efficient. 726 */ 727 int 728 ipf_send_reset(fr_info_t *fin) 729 { 730 struct tcphdr *tcp, *tcp2; 731 int tlen = 0, hlen; 732 struct mbuf *m; 733 #ifdef USE_INET6 734 ip6_t *ip6; 735 #endif 736 ip_t *ip; 737 738 tcp = fin->fin_dp; 739 if (tcp->th_flags & TH_RST) 740 return -1; /* feedback loop */ 741 742 if (ipf_checkl4sum(fin) == -1) 743 return -1; 744 745 tlen = fin->fin_dlen - (TCP_OFF(tcp) << 2) + 746 ((tcp->th_flags & TH_SYN) ? 1 : 0) + 747 ((tcp->th_flags & TH_FIN) ? 1 : 0); 748 749 #ifdef USE_INET6 750 hlen = (fin->fin_v == 6) ? sizeof(ip6_t) : sizeof(ip_t); 751 #else 752 hlen = sizeof(ip_t); 753 #endif 754 #ifdef MGETHDR 755 MGETHDR(m, M_DONTWAIT, MT_HEADER); 756 #else 757 MGET(m, M_DONTWAIT, MT_HEADER); 758 #endif 759 if (m == NULL) 760 return -1; 761 if (sizeof(*tcp2) + hlen > MHLEN) { 762 MCLGET(m, M_DONTWAIT); 763 if (m == NULL) 764 return -1; 765 if ((m->m_flags & M_EXT) == 0) { 766 FREE_MB_T(m); 767 return -1; 768 } 769 } 770 771 m->m_len = sizeof(*tcp2) + hlen; 772 m->m_data += max_linkhdr; 773 m->m_pkthdr.len = m->m_len; 774 m_reset_rcvif(m); 775 ip = mtod(m, struct ip *); 776 bzero((char *)ip, hlen); 777 #ifdef USE_INET6 778 ip6 = (ip6_t *)ip; 779 #endif 780 bzero((char *)ip, sizeof(*tcp2) + hlen); 781 tcp2 = (struct tcphdr *)((char *)ip + hlen); 782 tcp2->th_sport = tcp->th_dport; 783 tcp2->th_dport = tcp->th_sport; 784 785 if (tcp->th_flags & TH_ACK) { 786 tcp2->th_seq = tcp->th_ack; 787 tcp2->th_flags = TH_RST; 788 tcp2->th_ack = 0; 789 } else { 790 tcp2->th_seq = 0; 791 tcp2->th_ack = ntohl(tcp->th_seq); 792 tcp2->th_ack += tlen; 793 tcp2->th_ack = htonl(tcp2->th_ack); 794 tcp2->th_flags = TH_RST|TH_ACK; 795 } 796 tcp2->th_x2 = 0; 797 TCP_OFF_A(tcp2, sizeof(*tcp2) >> 2); 798 tcp2->th_win = tcp->th_win; 799 tcp2->th_sum = 0; 800 tcp2->th_urp = 0; 801 802 #ifdef USE_INET6 803 if (fin->fin_v == 6) { 804 ip6->ip6_flow = ((ip6_t *)fin->fin_ip)->ip6_flow; 805 ip6->ip6_plen = htons(sizeof(struct tcphdr)); 806 ip6->ip6_nxt = IPPROTO_TCP; 807 ip6->ip6_hlim = 0; 808 ip6->ip6_src = fin->fin_dst6.in6; 809 ip6->ip6_dst = fin->fin_src6.in6; 810 tcp2->th_sum = in6_cksum(m, IPPROTO_TCP, 811 sizeof(*ip6), sizeof(*tcp2)); 812 return ipf_send_ip(fin, m); 813 } 814 #endif 815 #ifdef INET 816 ip->ip_p = IPPROTO_TCP; 817 ip->ip_len = htons(sizeof(struct tcphdr)); 818 ip->ip_src.s_addr = fin->fin_daddr; 819 ip->ip_dst.s_addr = fin->fin_saddr; 820 tcp2->th_sum = in_cksum(m, hlen + sizeof(*tcp2)); 821 ip->ip_len = hlen + sizeof(*tcp2); 822 return ipf_send_ip(fin, m); 823 #else 824 return 0; 825 #endif 826 } 827 828 829 /* 830 * Expects ip_len to be in host byte order when called. 831 */ 832 static int 833 ipf_send_ip(fr_info_t *fin, mb_t *m) 834 { 835 fr_info_t fnew; 836 #ifdef INET 837 ip_t *oip; 838 #endif 839 ip_t *ip; 840 int hlen; 841 842 ip = mtod(m, ip_t *); 843 bzero((char *)&fnew, sizeof(fnew)); 844 fnew.fin_main_soft = fin->fin_main_soft; 845 846 IP_V_A(ip, fin->fin_v); 847 switch (fin->fin_v) 848 { 849 #ifdef INET 850 case 4 : 851 oip = fin->fin_ip; 852 hlen = sizeof(*oip); 853 fnew.fin_v = 4; 854 fnew.fin_p = ip->ip_p; 855 fnew.fin_plen = ntohs(ip->ip_len); 856 HTONS(ip->ip_len); 857 IP_HL_A(ip, sizeof(*oip) >> 2); 858 ip->ip_tos = oip->ip_tos; 859 ip->ip_id = ipf_nextipid(fin); 860 ip->ip_off = htons(ip_mtudisc ? IP_DF : 0); 861 ip->ip_ttl = ip_defttl; 862 ip->ip_sum = 0; 863 break; 864 #endif 865 #ifdef USE_INET6 866 case 6 : 867 { 868 ip6_t *ip6 = (ip6_t *)ip; 869 870 ip6->ip6_vfc = 0x60; 871 ip6->ip6_hlim = IPDEFTTL; 872 873 hlen = sizeof(*ip6); 874 fnew.fin_p = ip6->ip6_nxt; 875 fnew.fin_v = 6; 876 fnew.fin_plen = ntohs(ip6->ip6_plen) + hlen; 877 break; 878 } 879 #endif 880 default : 881 return EINVAL; 882 } 883 #ifdef KAME_IPSEC 884 m_reset_rcvif(m); 885 #endif 886 887 fnew.fin_ifp = fin->fin_ifp; 888 fnew.fin_flx = FI_NOCKSUM; 889 fnew.fin_m = m; 890 fnew.fin_ip = ip; 891 fnew.fin_mp = &m; 892 fnew.fin_hlen = hlen; 893 fnew.fin_dp = (char *)ip + hlen; 894 (void) ipf_makefrip(hlen, ip, &fnew); 895 896 return ipf_fastroute(m, &m, &fnew, NULL); 897 } 898 899 900 int 901 ipf_send_icmp_err(int type, fr_info_t *fin, int dst) 902 { 903 int err, hlen, xtra, iclen, ohlen, avail; 904 struct in_addr dst4; 905 struct icmp *icmp; 906 struct mbuf *m; 907 i6addr_t dst6; 908 void *ifp; 909 #ifdef USE_INET6 910 int code; 911 ip6_t *ip6; 912 #endif 913 ip_t *ip, *ip2; 914 915 if ((type < 0) || (type > ICMP_MAXTYPE)) 916 return -1; 917 918 #ifdef USE_INET6 919 code = fin->fin_icode; 920 if ((code < 0) || (code >= sizeof(icmptoicmp6unreach)/sizeof(int))) 921 return -1; 922 #endif 923 924 if (ipf_checkl4sum(fin) == -1) 925 return -1; 926 #ifdef MGETHDR 927 MGETHDR(m, M_DONTWAIT, MT_HEADER); 928 #else 929 MGET(m, M_DONTWAIT, MT_HEADER); 930 #endif 931 if (m == NULL) 932 return -1; 933 avail = MHLEN; 934 935 xtra = 0; 936 hlen = 0; 937 ohlen = 0; 938 dst4.s_addr = 0; 939 ifp = fin->fin_ifp; 940 if (fin->fin_v == 4) { 941 if ((fin->fin_p == IPPROTO_ICMP) && !(fin->fin_flx & FI_SHORT)) 942 switch (ntohs(fin->fin_data[0]) >> 8) 943 { 944 case ICMP_ECHO : 945 case ICMP_TSTAMP : 946 case ICMP_IREQ : 947 case ICMP_MASKREQ : 948 break; 949 default : 950 FREE_MB_T(m); 951 return 0; 952 } 953 954 if (dst == 0) { 955 if (ipf_ifpaddr(&ipfmain, 4, FRI_NORMAL, ifp, 956 &dst6, NULL) == -1) { 957 FREE_MB_T(m); 958 return -1; 959 } 960 dst4 = dst6.in4; 961 } else 962 dst4.s_addr = fin->fin_daddr; 963 964 hlen = sizeof(ip_t); 965 ohlen = fin->fin_hlen; 966 iclen = hlen + offsetof(struct icmp, icmp_ip) + ohlen; 967 if (fin->fin_hlen < fin->fin_plen) 968 xtra = MIN(fin->fin_dlen, 8); 969 else 970 xtra = 0; 971 } 972 973 #ifdef USE_INET6 974 else if (fin->fin_v == 6) { 975 hlen = sizeof(ip6_t); 976 ohlen = sizeof(ip6_t); 977 iclen = hlen + offsetof(struct icmp, icmp_ip) + ohlen; 978 type = icmptoicmp6types[type]; 979 if (type == ICMP6_DST_UNREACH) 980 code = icmptoicmp6unreach[code]; 981 982 if (iclen + max_linkhdr + fin->fin_plen > avail) { 983 MCLGET(m, M_DONTWAIT); 984 if (m == NULL) 985 return -1; 986 if ((m->m_flags & M_EXT) == 0) { 987 FREE_MB_T(m); 988 return -1; 989 } 990 avail = MCLBYTES; 991 } 992 xtra = MIN(fin->fin_plen, avail - iclen - max_linkhdr); 993 xtra = MIN(xtra, IPV6_MMTU - iclen); 994 if (dst == 0) { 995 if (ipf_ifpaddr(&ipfmain, 6, FRI_NORMAL, ifp, 996 &dst6, NULL) == -1) { 997 FREE_MB_T(m); 998 return -1; 999 } 1000 } else 1001 dst6 = fin->fin_dst6; 1002 } 1003 #endif 1004 else { 1005 FREE_MB_T(m); 1006 return -1; 1007 } 1008 1009 avail -= (max_linkhdr + iclen); 1010 if (avail < 0) { 1011 FREE_MB_T(m); 1012 return -1; 1013 } 1014 if (xtra > avail) 1015 xtra = avail; 1016 iclen += xtra; 1017 m->m_data += max_linkhdr; 1018 m_reset_rcvif(m); 1019 m->m_pkthdr.len = iclen; 1020 m->m_len = iclen; 1021 ip = mtod(m, ip_t *); 1022 icmp = (struct icmp *)((char *)ip + hlen); 1023 ip2 = (ip_t *)&icmp->icmp_ip; 1024 1025 icmp->icmp_type = type; 1026 icmp->icmp_code = fin->fin_icode; 1027 icmp->icmp_cksum = 0; 1028 #ifdef icmp_nextmtu 1029 if (type == ICMP_UNREACH && fin->fin_icode == ICMP_UNREACH_NEEDFRAG) { 1030 if (fin->fin_mtu != 0) { 1031 icmp->icmp_nextmtu = htons(fin->fin_mtu); 1032 1033 } else if (ifp != NULL) { 1034 icmp->icmp_nextmtu = htons(GETIFMTU_4(ifp)); 1035 1036 } else { /* make up a number... */ 1037 icmp->icmp_nextmtu = htons(fin->fin_plen - 20); 1038 } 1039 } 1040 #endif 1041 1042 bcopy((char *)fin->fin_ip, (char *)ip2, ohlen); 1043 1044 #if defined(M_CSUM_IPv4) 1045 /* 1046 * Clear any in-bound checksum flags for this packet. 1047 */ 1048 m->m_pkthdr.csuminfo = 0; 1049 #endif /* __NetBSD__ && M_CSUM_IPv4 */ 1050 1051 #ifdef USE_INET6 1052 ip6 = (ip6_t *)ip; 1053 if (fin->fin_v == 6) { 1054 ip6->ip6_flow = ((ip6_t *)fin->fin_ip)->ip6_flow; 1055 ip6->ip6_plen = htons(iclen - hlen); 1056 ip6->ip6_nxt = IPPROTO_ICMPV6; 1057 ip6->ip6_hlim = 0; 1058 ip6->ip6_src = dst6.in6; 1059 ip6->ip6_dst = fin->fin_src6.in6; 1060 if (xtra > 0) 1061 bcopy((char *)fin->fin_ip + ohlen, 1062 (char *)&icmp->icmp_ip + ohlen, xtra); 1063 icmp->icmp_cksum = in6_cksum(m, IPPROTO_ICMPV6, 1064 sizeof(*ip6), iclen - hlen); 1065 } else 1066 #endif 1067 { 1068 ip->ip_p = IPPROTO_ICMP; 1069 ip->ip_src.s_addr = dst4.s_addr; 1070 ip->ip_dst.s_addr = fin->fin_saddr; 1071 1072 if (xtra > 0) 1073 bcopy((char *)fin->fin_ip + ohlen, 1074 (char *)&icmp->icmp_ip + ohlen, xtra); 1075 icmp->icmp_cksum = ipf_cksum((u_short *)icmp, 1076 sizeof(*icmp) + 8); 1077 ip->ip_len = iclen; 1078 ip->ip_p = IPPROTO_ICMP; 1079 } 1080 err = ipf_send_ip(fin, m); 1081 return err; 1082 } 1083 1084 1085 /* 1086 * m0 - pointer to mbuf where the IP packet starts 1087 * mpp - pointer to the mbuf pointer that is the start of the mbuf chain 1088 */ 1089 int 1090 ipf_fastroute(mb_t *m0, mb_t **mpp, fr_info_t *fin, frdest_t *fdp) 1091 { 1092 register struct ip *ip, *mhip; 1093 register struct mbuf *m = *mpp; 1094 register struct route *ro; 1095 int len, off, error = 0, hlen, code; 1096 struct ifnet *ifp, *sifp; 1097 ipf_main_softc_t *softc; 1098 #if __NetBSD_Version__ >= 499001100 1099 union { 1100 struct sockaddr dst; 1101 struct sockaddr_in dst4; 1102 } u; 1103 #else 1104 struct sockaddr_in *dst4; 1105 #endif 1106 struct sockaddr *dst; 1107 u_short ip_off, ip_len; 1108 struct route iproute; 1109 struct rtentry *rt; 1110 frdest_t node; 1111 frentry_t *fr; 1112 1113 if (fin->fin_v == 6) { 1114 #ifdef USE_INET6 1115 error = ipf_fastroute6(m0, mpp, fin, fdp); 1116 #else 1117 error = EPROTONOSUPPORT; 1118 #endif 1119 if ((error != 0) && (*mpp != NULL)) 1120 FREE_MB_T(*mpp); 1121 return error; 1122 } 1123 #ifndef INET 1124 FREE_MB_T(*mpp); 1125 return EPROTONOSUPPORT; 1126 #else 1127 1128 hlen = fin->fin_hlen; 1129 ip = mtod(m0, struct ip *); 1130 softc = fin->fin_main_soft; 1131 rt = NULL; 1132 ifp = NULL; 1133 1134 # if defined(M_CSUM_IPv4) 1135 /* 1136 * Clear any in-bound checksum flags for this packet. 1137 */ 1138 m0->m_pkthdr.csuminfo = 0; 1139 # endif /* __NetBSD__ && M_CSUM_IPv4 */ 1140 1141 /* 1142 * Route packet. 1143 */ 1144 ro = &iproute; 1145 memset(ro, 0, sizeof(*ro)); 1146 fr = fin->fin_fr; 1147 1148 if ((fr != NULL) && !(fr->fr_flags & FR_KEEPSTATE) && (fdp != NULL) && 1149 (fdp->fd_type == FRD_DSTLIST)) { 1150 if (ipf_dstlist_select_node(fin, fdp->fd_ptr, NULL, &node) == 0) 1151 fdp = &node; 1152 } 1153 if (fdp != NULL) 1154 ifp = fdp->fd_ptr; 1155 else 1156 ifp = fin->fin_ifp; 1157 1158 if ((ifp == NULL) && ((fr == NULL) || !(fr->fr_flags & FR_FASTROUTE))) { 1159 error = -2; 1160 goto bad; 1161 } 1162 1163 # if __NetBSD_Version__ >= 499001100 1164 if ((fdp != NULL) && (fdp->fd_ip.s_addr != 0)) 1165 sockaddr_in_init(&u.dst4, &fdp->fd_ip, 0); 1166 else 1167 sockaddr_in_init(&u.dst4, &ip->ip_dst, 0); 1168 dst = &u.dst; 1169 rtcache_setdst(ro, dst); 1170 rt = rtcache_init(ro); 1171 # else 1172 dst4 = (struct sockaddr_in *)&ro->ro_dst; 1173 dst = (struct sockaddr *)dst4; 1174 dst4->sin_family = AF_INET; 1175 dst4->sin_addr = ip->ip_dst; 1176 1177 if ((fdp != NULL) && (fdp->fd_ip.s_addr != 0)) 1178 dst4->sin_addr = fdp->fd_ip; 1179 1180 dst4->sin_len = sizeof(*dst); 1181 rtalloc(ro); 1182 rt = ro->ro_rt; 1183 # endif 1184 if ((ifp == NULL) && (rt != NULL)) 1185 ifp = rt->rt_ifp; 1186 if ((rt == NULL) || (ifp == NULL)) { 1187 #ifdef INET 1188 if (in_localaddr(ip->ip_dst)) 1189 error = EHOSTUNREACH; 1190 else 1191 #endif 1192 error = ENETUNREACH; 1193 goto bad; 1194 } 1195 1196 1197 if (rt->rt_flags & RTF_GATEWAY) 1198 dst = rt->rt_gateway; 1199 1200 rt->rt_use++; 1201 1202 /* 1203 * For input packets which are being "fastrouted", they won't 1204 * go back through output filtering and miss their chance to get 1205 * NAT'd and counted. Duplicated packets aren't considered to be 1206 * part of the normal packet stream, so do not NAT them or pass 1207 * them through stateful checking, etc. 1208 */ 1209 if ((fdp != &fr->fr_dif) && (fin->fin_out == 0)) { 1210 sifp = fin->fin_ifp; 1211 fin->fin_ifp = ifp; 1212 fin->fin_out = 1; 1213 (void) ipf_acctpkt(fin, NULL); 1214 fin->fin_fr = NULL; 1215 if (!fr || !(fr->fr_flags & FR_RETMASK)) { 1216 u_32_t pass; 1217 1218 (void) ipf_state_check(fin, &pass); 1219 } 1220 1221 switch (ipf_nat_checkout(fin, NULL)) 1222 { 1223 case 0 : 1224 break; 1225 case 1 : 1226 ip->ip_sum = 0; 1227 break; 1228 case -1 : 1229 error = -1; 1230 goto bad; 1231 break; 1232 } 1233 1234 fin->fin_ifp = sifp; 1235 fin->fin_out = 0; 1236 } else 1237 ip->ip_sum = 0; 1238 /* 1239 * If small enough for interface, can just send directly. 1240 */ 1241 m_set_rcvif(m, ifp); 1242 1243 ip_len = ntohs(ip->ip_len); 1244 if (ip_len <= ifp->if_mtu) { 1245 # if defined(M_CSUM_IPv4) 1246 # if (__NetBSD_Version__ >= 105009999) 1247 if (ifp->if_csum_flags_tx & M_CSUM_IPv4) 1248 m->m_pkthdr.csuminfo |= M_CSUM_IPv4; 1249 # else 1250 if (ifp->if_capabilities & IFCAP_CSUM_IPv4) 1251 m->m_pkthdr.csuminfo |= M_CSUM_IPv4; 1252 # endif /* (__NetBSD_Version__ >= 105009999) */ 1253 else if (ip->ip_sum == 0) 1254 ip->ip_sum = in_cksum(m, hlen); 1255 # else 1256 if (!ip->ip_sum) 1257 ip->ip_sum = in_cksum(m, hlen); 1258 # endif /* M_CSUM_IPv4 */ 1259 1260 error = if_output_lock(ifp, ifp, m, dst, rt); 1261 goto done; 1262 } 1263 1264 /* 1265 * Too large for interface; fragment if possible. 1266 * Must be able to put at least 8 bytes per fragment. 1267 */ 1268 ip_off = ntohs(ip->ip_off); 1269 if (ip_off & IP_DF) { 1270 error = EMSGSIZE; 1271 goto bad; 1272 } 1273 len = (ifp->if_mtu - hlen) &~ 7; 1274 if (len < 8) { 1275 error = EMSGSIZE; 1276 goto bad; 1277 } 1278 1279 { 1280 int mhlen, firstlen = len; 1281 struct mbuf **mnext = &m->m_act; 1282 1283 /* 1284 * Loop through length of segment after first fragment, 1285 * make new header and copy data of each part and link onto chain. 1286 */ 1287 m0 = m; 1288 mhlen = sizeof (struct ip); 1289 for (off = hlen + len; off < ip_len; off += len) { 1290 # ifdef MGETHDR 1291 MGETHDR(m, M_DONTWAIT, MT_HEADER); 1292 # else 1293 MGET(m, M_DONTWAIT, MT_HEADER); 1294 # endif 1295 if (m == 0) { 1296 m = m0; 1297 error = ENOBUFS; 1298 goto bad; 1299 } 1300 m->m_data += max_linkhdr; 1301 mhip = mtod(m, struct ip *); 1302 bcopy((char *)ip, (char *)mhip, sizeof(*ip)); 1303 #ifdef INET 1304 if (hlen > sizeof (struct ip)) { 1305 mhlen = ip_optcopy(ip, mhip) + sizeof (struct ip); 1306 IP_HL_A(mhip, mhlen >> 2); 1307 } 1308 #endif 1309 m->m_len = mhlen; 1310 mhip->ip_off = ((off - hlen) >> 3) + ip_off; 1311 if (off + len >= ip_len) 1312 len = ip_len - off; 1313 else 1314 mhip->ip_off |= IP_MF; 1315 mhip->ip_len = htons((u_short)(len + mhlen)); 1316 m->m_next = m_copy(m0, off, len); 1317 if (m->m_next == 0) { 1318 error = ENOBUFS; /* ??? */ 1319 goto sendorfree; 1320 } 1321 m->m_pkthdr.len = mhlen + len; 1322 m_reset_rcvif(m); 1323 mhip->ip_off = htons((u_short)mhip->ip_off); 1324 mhip->ip_sum = 0; 1325 #ifdef INET 1326 mhip->ip_sum = in_cksum(m, mhlen); 1327 #endif 1328 *mnext = m; 1329 mnext = &m->m_act; 1330 } 1331 /* 1332 * Update first fragment by trimming what's been copied out 1333 * and updating header, then send each fragment (in order). 1334 */ 1335 m_adj(m0, hlen + firstlen - ip_len); 1336 ip->ip_len = htons((u_short)(hlen + firstlen)); 1337 ip->ip_off = htons((u_short)IP_MF); 1338 ip->ip_sum = 0; 1339 #ifdef INET 1340 ip->ip_sum = in_cksum(m0, hlen); 1341 #endif 1342 sendorfree: 1343 for (m = m0; m; m = m0) { 1344 m0 = m->m_act; 1345 m->m_act = 0; 1346 if (error == 0) { 1347 KERNEL_LOCK(1, NULL); 1348 error = (*ifp->if_output)(ifp, m, dst, rt); 1349 KERNEL_UNLOCK_ONE(NULL); 1350 } else { 1351 FREE_MB_T(m); 1352 } 1353 } 1354 } 1355 done: 1356 if (!error) 1357 softc->ipf_frouteok[0]++; 1358 else 1359 softc->ipf_frouteok[1]++; 1360 1361 # if __NetBSD_Version__ >= 499001100 1362 rtcache_unref(rt, ro); 1363 rtcache_free(ro); 1364 # else 1365 if (rt) { 1366 RTFREE(rt); 1367 } 1368 # endif 1369 return error; 1370 bad: 1371 if (error == EMSGSIZE) { 1372 sifp = fin->fin_ifp; 1373 code = fin->fin_icode; 1374 fin->fin_icode = ICMP_UNREACH_NEEDFRAG; 1375 fin->fin_ifp = ifp; 1376 (void) ipf_send_icmp_err(ICMP_UNREACH, fin, 1); 1377 fin->fin_ifp = sifp; 1378 fin->fin_icode = code; 1379 } 1380 FREE_MB_T(m); 1381 goto done; 1382 #endif /* INET */ 1383 } 1384 1385 1386 #if defined(USE_INET6) 1387 /* 1388 * This is the IPv6 specific fastroute code. It doesn't clean up the mbuf's 1389 * or ensure that it is an IPv6 packet that is being forwarded, those are 1390 * expected to be done by the called (ipf_fastroute). 1391 */ 1392 static int 1393 ipf_fastroute6(struct mbuf *m0, struct mbuf **mpp, fr_info_t *fin, 1394 frdest_t *fdp) 1395 { 1396 # if __NetBSD_Version__ >= 499001100 1397 struct route ip6route; 1398 const struct sockaddr *dst; 1399 union { 1400 struct sockaddr dst; 1401 struct sockaddr_in6 dst6; 1402 } u; 1403 struct route *ro; 1404 # else 1405 struct route_in6 ip6route; 1406 struct sockaddr_in6 *dst6; 1407 struct route_in6 *ro; 1408 # endif 1409 struct rtentry *rt; 1410 struct ifnet *ifp; 1411 u_long mtu; 1412 int error; 1413 1414 error = 0; 1415 ro = &ip6route; 1416 1417 if (fdp != NULL) 1418 ifp = fdp->fd_ptr; 1419 else 1420 ifp = fin->fin_ifp; 1421 memset(ro, 0, sizeof(*ro)); 1422 # if __NetBSD_Version__ >= 499001100 1423 if (fdp != NULL && IP6_NOTZERO(&fdp->fd_ip6)) 1424 sockaddr_in6_init(&u.dst6, &fdp->fd_ip6.in6, 0, 0, 0); 1425 else 1426 sockaddr_in6_init(&u.dst6, &fin->fin_fi.fi_dst.in6, 0, 0, 0); 1427 dst = &u.dst; 1428 rtcache_setdst(ro, dst); 1429 1430 rt = rtcache_init(ro); 1431 if ((ifp == NULL) && (rt != NULL)) 1432 ifp = rt->rt_ifp; 1433 # else 1434 dst6 = (struct sockaddr_in6 *)&ro->ro_dst; 1435 dst6->sin6_family = AF_INET6; 1436 dst6->sin6_len = sizeof(struct sockaddr_in6); 1437 dst6->sin6_addr = fin->fin_fi.fi_dst.in6; 1438 1439 if (fdp != NULL) { 1440 if (IP6_NOTZERO(&fdp->fd_ip6)) 1441 dst6->sin6_addr = fdp->fd_ip6.in6; 1442 } 1443 1444 rtalloc((struct route *)ro); 1445 1446 if ((ifp == NULL) && (ro->ro_rt != NULL)) 1447 ifp = ro->ro_rt->rt_ifp; 1448 rt = ro->ro_rt; 1449 # endif 1450 if ((rt == NULL) || (ifp == NULL)) { 1451 1452 error = EHOSTUNREACH; 1453 goto bad; 1454 } 1455 1456 /* KAME */ 1457 # if __NetBSD_Version__ >= 499001100 1458 if (IN6_IS_ADDR_LINKLOCAL(&u.dst6.sin6_addr)) 1459 u.dst6.sin6_addr.s6_addr16[1] = htons(ifp->if_index); 1460 # else 1461 if (IN6_IS_ADDR_LINKLOCAL(&dst6->sin6_addr)) 1462 dst6->sin6_addr.s6_addr16[1] = htons(ifp->if_index); 1463 # endif 1464 1465 { 1466 # if (__NetBSD_Version__ >= 106010000) && !defined(IN6_LINKMTU) 1467 struct in6_ifextra *ife; 1468 # endif 1469 if (rt->rt_flags & RTF_GATEWAY) 1470 # if __NetBSD_Version__ >= 499001100 1471 dst = rt->rt_gateway; 1472 # else 1473 dst6 = (struct sockaddr_in6 *)rt->rt_gateway; 1474 # endif 1475 rt->rt_use++; 1476 1477 /* Determine path MTU. */ 1478 # if (__NetBSD_Version__ <= 106009999) 1479 mtu = nd_ifinfo[ifp->if_index].linkmtu; 1480 # else 1481 # ifdef IN6_LINKMTU 1482 mtu = IN6_LINKMTU(ifp); 1483 # else 1484 ife = (struct in6_ifextra *)(ifp)->if_afdata[AF_INET6]; 1485 mtu = ife->nd_ifinfo[ifp->if_index].linkmtu; 1486 # endif 1487 # endif 1488 if ((error == 0) && (m0->m_pkthdr.len <= mtu)) { 1489 # if __NetBSD_Version__ >= 499001100 1490 error = ip6_if_output(ifp, ifp, m0, satocsin6(dst), rt); 1491 # else 1492 error = nd6_output(ifp, ifp, m0, dst6, rt); 1493 # endif 1494 } else { 1495 error = EMSGSIZE; 1496 } 1497 } 1498 bad: 1499 # if __NetBSD_Version__ >= 499001100 1500 rtcache_unref(rt, ro); 1501 rtcache_free(ro); 1502 # else 1503 if (ro->ro_rt != NULL) { 1504 RTFREE(((struct route *)ro)->ro_rt); 1505 } 1506 # endif 1507 return error; 1508 } 1509 #endif /* INET6 */ 1510 1511 1512 int 1513 ipf_verifysrc(fr_info_t *fin) 1514 { 1515 #if __NetBSD_Version__ >= 499001100 1516 union { 1517 struct sockaddr dst; 1518 struct sockaddr_in dst4; 1519 } u; 1520 struct rtentry *rt; 1521 #else 1522 struct sockaddr_in *dst; 1523 #endif 1524 struct route iproute; 1525 int rc; 1526 1527 #if __NetBSD_Version__ >= 499001100 1528 sockaddr_in_init(&u.dst4, &fin->fin_src, 0); 1529 rtcache_setdst(&iproute, &u.dst); 1530 rt = rtcache_init(&iproute); 1531 if (rt == NULL) 1532 rc = 0; 1533 else 1534 rc = (fin->fin_ifp == rt->rt_ifp); 1535 rtcache_unref(rt, &iproute); 1536 rtcache_free(&iproute); 1537 #else 1538 dst = (struct sockaddr_in *)&iproute.ro_dst; 1539 dst->sin_len = sizeof(*dst); 1540 dst->sin_family = AF_INET; 1541 dst->sin_addr = fin->fin_src; 1542 rtalloc(&iproute); 1543 if (iproute.ro_rt == NULL) 1544 return 0; 1545 rc = (fin->fin_ifp == iproute.ro_rt->rt_ifp); 1546 RTFREE(iproute.ro_rt); 1547 #endif 1548 return rc; 1549 } 1550 1551 1552 /* 1553 * return the first IP Address associated with an interface 1554 */ 1555 int 1556 ipf_ifpaddr(ipf_main_softc_t *softc, int v, int atype, void *ifptr, 1557 i6addr_t *inp, i6addr_t *inpmask) 1558 { 1559 #ifdef USE_INET6 1560 struct in6_addr *inp6 = NULL; 1561 #endif 1562 struct sockaddr *sock, *mask; 1563 struct sockaddr_in *sin; 1564 struct ifaddr *ifa; 1565 struct ifnet *ifp; 1566 1567 if ((ifptr == NULL) || (ifptr == (void *)-1)) 1568 return -1; 1569 1570 ifp = ifptr; 1571 mask = NULL; 1572 1573 if (v == 4) 1574 inp->in4.s_addr = 0; 1575 #ifdef USE_INET6 1576 else if (v == 6) 1577 bzero((char *)inp, sizeof(*inp)); 1578 #endif 1579 1580 ifa = IFADDR_READER_FIRST(ifp); 1581 sock = ifa ? ifa->ifa_addr : NULL; 1582 while (sock != NULL && ifa != NULL) { 1583 sin = (struct sockaddr_in *)sock; 1584 if ((v == 4) && (sin->sin_family == AF_INET)) 1585 break; 1586 #ifdef USE_INET6 1587 if ((v == 6) && (sin->sin_family == AF_INET6)) { 1588 inp6 = &((struct sockaddr_in6 *)sin)->sin6_addr; 1589 if (!IN6_IS_ADDR_LINKLOCAL(inp6) && 1590 !IN6_IS_ADDR_LOOPBACK(inp6)) 1591 break; 1592 } 1593 #endif 1594 ifa = IFADDR_READER_NEXT(ifa); 1595 if (ifa != NULL) 1596 sock = ifa->ifa_addr; 1597 } 1598 if (ifa == NULL || sock == NULL) 1599 return -1; 1600 1601 mask = ifa->ifa_netmask; 1602 if (atype == FRI_BROADCAST) 1603 sock = ifa->ifa_broadaddr; 1604 else if (atype == FRI_PEERADDR) 1605 sock = ifa->ifa_dstaddr; 1606 1607 #ifdef USE_INET6 1608 if (v == 6) 1609 return ipf_ifpfillv6addr(atype, (struct sockaddr_in6 *)sock, 1610 (struct sockaddr_in6 *)mask, 1611 inp, inpmask); 1612 #endif 1613 return ipf_ifpfillv4addr(atype, (struct sockaddr_in *)sock, 1614 (struct sockaddr_in *)mask, 1615 &inp->in4, &inpmask->in4); 1616 } 1617 1618 1619 u_32_t 1620 ipf_newisn(fr_info_t *fin) 1621 { 1622 #if __NetBSD_Version__ >= 105190000 /* 1.5T */ 1623 size_t asz; 1624 1625 if (fin->fin_v == 4) 1626 asz = sizeof(struct in_addr); 1627 else if (fin->fin_v == 6) 1628 asz = sizeof(fin->fin_src); 1629 else /* XXX: no way to return error */ 1630 return 0; 1631 #ifdef INET 1632 return tcp_new_iss1((void *)&fin->fin_src, (void *)&fin->fin_dst, 1633 fin->fin_sport, fin->fin_dport, asz, 0); 1634 #else 1635 return ENOSYS; 1636 #endif 1637 #else 1638 static int iss_seq_off = 0; 1639 u_char hash[16]; 1640 u_32_t newiss; 1641 MD5_CTX ctx; 1642 1643 /* 1644 * Compute the base value of the ISS. It is a hash 1645 * of (saddr, sport, daddr, dport, secret). 1646 */ 1647 MD5Init(&ctx); 1648 1649 MD5Update(&ctx, (u_char *) &fin->fin_fi.fi_src, 1650 sizeof(fin->fin_fi.fi_src)); 1651 MD5Update(&ctx, (u_char *) &fin->fin_fi.fi_dst, 1652 sizeof(fin->fin_fi.fi_dst)); 1653 MD5Update(&ctx, (u_char *) &fin->fin_dat, sizeof(fin->fin_dat)); 1654 1655 MD5Update(&ctx, ipf_iss_secret, sizeof(ipf_iss_secret)); 1656 1657 MD5Final(hash, &ctx); 1658 1659 memcpy(&newiss, hash, sizeof(newiss)); 1660 1661 /* 1662 * Now increment our "timer", and add it in to 1663 * the computed value. 1664 * 1665 * XXX Use `addin'? 1666 * XXX TCP_ISSINCR too large to use? 1667 */ 1668 iss_seq_off += 0x00010000; 1669 newiss += iss_seq_off; 1670 return newiss; 1671 #endif 1672 } 1673 1674 1675 /* ------------------------------------------------------------------------ */ 1676 /* Function: ipf_nextipid */ 1677 /* Returns: int - 0 == success, -1 == error (packet should be droppped) */ 1678 /* Parameters: fin(I) - pointer to packet information */ 1679 /* */ 1680 /* Returns the next IPv4 ID to use for this packet. */ 1681 /* ------------------------------------------------------------------------ */ 1682 u_short 1683 ipf_nextipid(fr_info_t *fin) 1684 { 1685 #ifdef USE_MUTEXES 1686 ipf_main_softc_t *softc = fin->fin_main_soft; 1687 #endif 1688 u_short id; 1689 1690 MUTEX_ENTER(&softc->ipf_rw); 1691 id = ipid++; 1692 MUTEX_EXIT(&softc->ipf_rw); 1693 1694 return id; 1695 } 1696 1697 1698 EXTERN_INLINE int 1699 ipf_checkv4sum(fr_info_t *fin) 1700 { 1701 #ifdef M_CSUM_TCP_UDP_BAD 1702 int manual, pflag, cflags, active; 1703 mb_t *m; 1704 1705 if ((fin->fin_flx & FI_NOCKSUM) != 0) 1706 return 0; 1707 1708 if ((fin->fin_flx & FI_SHORT) != 0) 1709 return 1; 1710 1711 if (fin->fin_cksum != FI_CK_NEEDED) 1712 return (fin->fin_cksum > FI_CK_NEEDED) ? 0 : -1; 1713 1714 manual = 0; 1715 m = fin->fin_m; 1716 if (m == NULL) { 1717 manual = 1; 1718 goto skipauto; 1719 } 1720 1721 switch (fin->fin_p) 1722 { 1723 case IPPROTO_UDP : 1724 pflag = M_CSUM_UDPv4; 1725 break; 1726 case IPPROTO_TCP : 1727 pflag = M_CSUM_TCPv4; 1728 break; 1729 default : 1730 pflag = 0; 1731 manual = 1; 1732 break; 1733 } 1734 1735 active = ((struct ifnet *)fin->fin_ifp)->if_csum_flags_rx & pflag; 1736 active |= M_CSUM_TCP_UDP_BAD | M_CSUM_DATA; 1737 cflags = m->m_pkthdr.csum_flags & active; 1738 1739 if (pflag != 0) { 1740 if (cflags == (pflag | M_CSUM_TCP_UDP_BAD)) { 1741 fin->fin_flx |= FI_BAD; 1742 fin->fin_cksum = FI_CK_BAD; 1743 } else if (cflags == (pflag | M_CSUM_DATA)) { 1744 if ((m->m_pkthdr.csum_data ^ 0xffff) != 0) { 1745 fin->fin_flx |= FI_BAD; 1746 fin->fin_cksum = FI_CK_BAD; 1747 } else { 1748 fin->fin_cksum = FI_CK_SUMOK; 1749 } 1750 } else if (cflags == pflag) { 1751 fin->fin_cksum = FI_CK_SUMOK; 1752 } else { 1753 manual = 1; 1754 } 1755 } 1756 skipauto: 1757 if (manual != 0) { 1758 if (ipf_checkl4sum(fin) == -1) { 1759 fin->fin_flx |= FI_BAD; 1760 return -1; 1761 } 1762 } 1763 #else 1764 if (ipf_checkl4sum(fin) == -1) { 1765 fin->fin_flx |= FI_BAD; 1766 return -1; 1767 } 1768 #endif 1769 return 0; 1770 } 1771 1772 1773 #ifdef USE_INET6 1774 EXTERN_INLINE int 1775 ipf_checkv6sum(fr_info_t *fin) 1776 { 1777 # ifdef M_CSUM_TCP_UDP_BAD 1778 int manual, pflag, cflags, active; 1779 mb_t *m; 1780 1781 if ((fin->fin_flx & FI_NOCKSUM) != 0) 1782 return 0; 1783 1784 if ((fin->fin_flx & FI_SHORT) != 0) 1785 return 1; 1786 1787 if (fin->fin_cksum != FI_CK_SUMOK) 1788 return (fin->fin_cksum > FI_CK_NEEDED) ? 0 : -1; 1789 1790 1791 manual = 0; 1792 m = fin->fin_m; 1793 1794 switch (fin->fin_p) 1795 { 1796 case IPPROTO_UDP : 1797 pflag = M_CSUM_UDPv6; 1798 break; 1799 case IPPROTO_TCP : 1800 pflag = M_CSUM_TCPv6; 1801 break; 1802 default : 1803 pflag = 0; 1804 manual = 1; 1805 break; 1806 } 1807 1808 active = ((struct ifnet *)fin->fin_ifp)->if_csum_flags_rx & pflag; 1809 active |= M_CSUM_TCP_UDP_BAD | M_CSUM_DATA; 1810 cflags = m->m_pkthdr.csum_flags & active; 1811 1812 if (pflag != 0) { 1813 if (cflags == (pflag | M_CSUM_TCP_UDP_BAD)) { 1814 fin->fin_flx |= FI_BAD; 1815 } else if (cflags == (pflag | M_CSUM_DATA)) { 1816 if ((m->m_pkthdr.csum_data ^ 0xffff) != 0) 1817 fin->fin_flx |= FI_BAD; 1818 } else if (cflags == pflag) { 1819 ; 1820 } else { 1821 manual = 1; 1822 } 1823 } 1824 if (manual != 0) { 1825 if (ipf_checkl4sum(fin) == -1) { 1826 fin->fin_flx |= FI_BAD; 1827 return -1; 1828 } 1829 } 1830 # else 1831 if (ipf_checkl4sum(fin) == -1) { 1832 fin->fin_flx |= FI_BAD; 1833 return -1; 1834 } 1835 # endif 1836 return 0; 1837 } 1838 #endif /* USE_INET6 */ 1839 1840 1841 size_t 1842 mbufchainlen(struct mbuf *m0) 1843 { 1844 size_t len; 1845 1846 if ((m0->m_flags & M_PKTHDR) != 0) { 1847 len = m0->m_pkthdr.len; 1848 } else { 1849 struct mbuf *m; 1850 1851 for (m = m0, len = 0; m != NULL; m = m->m_next) 1852 len += m->m_len; 1853 } 1854 return len; 1855 } 1856 1857 1858 /* ------------------------------------------------------------------------ */ 1859 /* Function: ipf_pullup */ 1860 /* Returns: NULL == pullup failed, else pointer to protocol header */ 1861 /* Parameters: xmin(I)- pointer to buffer where data packet starts */ 1862 /* fin(I) - pointer to packet information */ 1863 /* len(I) - number of bytes to pullup */ 1864 /* */ 1865 /* Attempt to move at least len bytes (from the start of the buffer) into a */ 1866 /* single buffer for ease of access. Operating system native functions are */ 1867 /* used to manage buffers - if necessary. If the entire packet ends up in */ 1868 /* a single buffer, set the FI_COALESCE flag even though ipf_coalesce() has */ 1869 /* not been called. Both fin_ip and fin_dp are updated before exiting _IF_ */ 1870 /* and ONLY if the pullup succeeds. */ 1871 /* */ 1872 /* We assume that 'xmin' is a pointer to a buffer that is part of the chain */ 1873 /* of buffers that starts at *fin->fin_mp. */ 1874 /* ------------------------------------------------------------------------ */ 1875 void * 1876 ipf_pullup(mb_t *xmin, fr_info_t *fin, int len) 1877 { 1878 int dpoff, ipoff; 1879 mb_t *m = xmin; 1880 char *ip; 1881 1882 if (m == NULL) 1883 return NULL; 1884 1885 ip = (char *)fin->fin_ip; 1886 if ((fin->fin_flx & FI_COALESCE) != 0) 1887 return ip; 1888 1889 ipoff = fin->fin_ipoff; 1890 if (fin->fin_dp != NULL) 1891 dpoff = (char *)fin->fin_dp - (char *)ip; 1892 else 1893 dpoff = 0; 1894 1895 if (M_LEN(m) < len) { 1896 mb_t *n = *fin->fin_mp; 1897 /* 1898 * Assume that M_PKTHDR is set and just work with what is left 1899 * rather than check.. 1900 * Should not make any real difference, anyway. 1901 */ 1902 if (m != n) { 1903 /* 1904 * Record the mbuf that points to the mbuf that we're 1905 * about to go to work on so that we can update the 1906 * m_next appropriately later. 1907 */ 1908 for (; n->m_next != m; n = n->m_next) 1909 ; 1910 } else { 1911 n = NULL; 1912 } 1913 1914 #ifdef MHLEN 1915 if (len > MHLEN) 1916 #else 1917 if (len > MLEN) 1918 #endif 1919 { 1920 #ifdef HAVE_M_PULLDOWN 1921 if (m_pulldown(m, 0, len, NULL) == NULL) 1922 m = NULL; 1923 #else 1924 FREE_MB_T(*fin->fin_mp); 1925 m = NULL; 1926 n = NULL; 1927 #endif 1928 } else 1929 { 1930 m = m_pullup(m, len); 1931 } 1932 if (n != NULL) 1933 n->m_next = m; 1934 if (m == NULL) { 1935 /* 1936 * When n is non-NULL, it indicates that m pointed to 1937 * a sub-chain (tail) of the mbuf and that the head 1938 * of this chain has not yet been free'd. 1939 */ 1940 if (n != NULL) { 1941 FREE_MB_T(*fin->fin_mp); 1942 } 1943 1944 *fin->fin_mp = NULL; 1945 fin->fin_m = NULL; 1946 return NULL; 1947 } 1948 1949 if (n == NULL) 1950 *fin->fin_mp = m; 1951 1952 while (M_LEN(m) == 0) { 1953 m = m->m_next; 1954 } 1955 fin->fin_m = m; 1956 ip = MTOD(m, char *) + ipoff; 1957 1958 fin->fin_ip = (ip_t *)ip; 1959 if (fin->fin_dp != NULL) 1960 fin->fin_dp = (char *)fin->fin_ip + dpoff; 1961 if (fin->fin_fraghdr != NULL) 1962 fin->fin_fraghdr = (char *)ip + 1963 ((char *)fin->fin_fraghdr - 1964 (char *)fin->fin_ip); 1965 } 1966 1967 if (len == fin->fin_plen) 1968 fin->fin_flx |= FI_COALESCE; 1969 return ip; 1970 } 1971 1972 1973 int 1974 ipf_inject(fr_info_t *fin, mb_t *m) 1975 { 1976 int error; 1977 1978 if (fin->fin_out == 0) { 1979 if (__predict_false(!pktq_enqueue(ip_pktq, m, 0))) { 1980 FREE_MB_T(m); 1981 error = ENOBUFS; 1982 } else { 1983 error = 0; 1984 } 1985 } else { 1986 error = ip_output(m, NULL, NULL, IP_FORWARDING, NULL, NULL); 1987 } 1988 return error; 1989 } 1990 1991 1992 u_32_t 1993 ipf_random(void) 1994 { 1995 int number; 1996 1997 #ifdef _CPRNG_H 1998 number = cprng_fast32(); 1999 #else 2000 number = arc4random(); 2001 #endif 2002 return number; 2003 } 2004 2005 2006 /* 2007 * routines below for saving IP headers to buffer 2008 */ 2009 static int ipfopen(dev_t dev, int flags 2010 #if (NetBSD >= 199511) 2011 , int devtype, PROC_T *p 2012 #endif 2013 ) 2014 { 2015 u_int unit = GET_MINOR(dev); 2016 int error; 2017 2018 if (IPL_LOGMAX < unit) { 2019 error = ENXIO; 2020 } else { 2021 switch (unit) 2022 { 2023 case IPL_LOGIPF : 2024 case IPL_LOGNAT : 2025 case IPL_LOGSTATE : 2026 case IPL_LOGAUTH : 2027 case IPL_LOGLOOKUP : 2028 case IPL_LOGSYNC : 2029 #ifdef IPFILTER_SCAN 2030 case IPL_LOGSCAN : 2031 #endif 2032 error = 0; 2033 break; 2034 default : 2035 error = ENXIO; 2036 break; 2037 } 2038 } 2039 #if (__NetBSD_Version__ >= 799003000) 2040 if (error == 0) { 2041 mutex_enter(&ipf_ref_mutex); 2042 ipf_active = 1; 2043 mutex_exit(&ipf_ref_mutex); 2044 } 2045 #endif 2046 return error; 2047 } 2048 2049 2050 static int ipfclose(dev_t dev, int flags 2051 #if (NetBSD >= 199511) 2052 , int devtype, PROC_T *p 2053 #endif 2054 ) 2055 { 2056 u_int unit = GET_MINOR(dev); 2057 2058 if (IPL_LOGMAX < unit) 2059 return ENXIO; 2060 else { 2061 #if (__NetBSD_Version__ >= 799003000) 2062 mutex_enter(&ipf_ref_mutex); 2063 ipf_active = 0; 2064 mutex_exit(&ipf_ref_mutex); 2065 #endif 2066 return 0; 2067 } 2068 } 2069 2070 /* 2071 * ipfread/ipflog 2072 * both of these must operate with at least splnet() lest they be 2073 * called during packet processing and cause an inconsistancy to appear in 2074 * the filter lists. 2075 */ 2076 static int ipfread(dev_t dev, struct uio *uio, int ioflag) 2077 { 2078 2079 if (ipfmain.ipf_running < 1) { 2080 ipfmain.ipf_interror = 130006; 2081 return EIO; 2082 } 2083 2084 if (GET_MINOR(dev) == IPL_LOGSYNC) 2085 return ipf_sync_read(&ipfmain, uio); 2086 2087 #ifdef IPFILTER_LOG 2088 return ipf_log_read(&ipfmain, GET_MINOR(dev), uio); 2089 #else 2090 ipfmain.ipf_interror = 130007; 2091 return ENXIO; 2092 #endif 2093 } 2094 2095 2096 /* 2097 * ipfwrite 2098 * both of these must operate with at least splnet() lest they be 2099 * called during packet processing and cause an inconsistancy to appear in 2100 * the filter lists. 2101 */ 2102 static int ipfwrite(dev_t dev, struct uio *uio, int ioflag) 2103 { 2104 2105 if (ipfmain.ipf_running < 1) { 2106 ipfmain.ipf_interror = 130008; 2107 return EIO; 2108 } 2109 2110 if (GET_MINOR(dev) == IPL_LOGSYNC) 2111 return ipf_sync_write(&ipfmain, uio); 2112 ipfmain.ipf_interror = 130009; 2113 return ENXIO; 2114 } 2115 2116 2117 static int ipfpoll(dev_t dev, int events, PROC_T *p) 2118 { 2119 u_int unit = GET_MINOR(dev); 2120 int revents = 0; 2121 2122 if (IPL_LOGMAX < unit) { 2123 ipfmain.ipf_interror = 130010; 2124 return ENXIO; 2125 } 2126 2127 switch (unit) 2128 { 2129 case IPL_LOGIPF : 2130 case IPL_LOGNAT : 2131 case IPL_LOGSTATE : 2132 #ifdef IPFILTER_LOG 2133 if ((events & (POLLIN | POLLRDNORM)) && 2134 ipf_log_canread(&ipfmain, unit)) 2135 revents |= events & (POLLIN | POLLRDNORM); 2136 #endif 2137 break; 2138 case IPL_LOGAUTH : 2139 if ((events & (POLLIN | POLLRDNORM)) && 2140 ipf_auth_waiting(&ipfmain)) 2141 revents |= events & (POLLIN | POLLRDNORM); 2142 break; 2143 case IPL_LOGSYNC : 2144 if ((events & (POLLIN | POLLRDNORM)) && 2145 ipf_sync_canread(&ipfmain)) 2146 revents |= events & (POLLIN | POLLRDNORM); 2147 if ((events & (POLLOUT | POLLWRNORM)) && 2148 ipf_sync_canwrite(&ipfmain)) 2149 revents |= events & (POLLOUT | POLLWRNORM); 2150 break; 2151 case IPL_LOGSCAN : 2152 case IPL_LOGLOOKUP : 2153 default : 2154 break; 2155 } 2156 2157 if ((revents == 0) && (((events & (POLLIN|POLLRDNORM)) != 0))) 2158 selrecord(p, &ipfmain.ipf_selwait[unit]); 2159 return revents; 2160 } 2161 2162 u_int 2163 ipf_pcksum(fr_info_t *fin, int hlen, u_int sum) 2164 { 2165 struct mbuf *m; 2166 u_int sum2; 2167 int off; 2168 2169 m = fin->fin_m; 2170 off = (char *)fin->fin_dp - (char *)fin->fin_ip; 2171 m->m_data += hlen; 2172 m->m_len -= hlen; 2173 sum2 = in_cksum(fin->fin_m, fin->fin_plen - off); 2174 m->m_len += hlen; 2175 m->m_data -= hlen; 2176 2177 /* 2178 * Both sum and sum2 are partial sums, so combine them together. 2179 */ 2180 sum += ~sum2 & 0xffff; 2181 while (sum > 0xffff) 2182 sum = (sum & 0xffff) + (sum >> 16); 2183 sum2 = ~sum & 0xffff; 2184 return sum2; 2185 } 2186 2187 #if (__NetBSD_Version__ >= 799003000) 2188 2189 /* NetBSD module interface */ 2190 2191 MODULE(MODULE_CLASS_DRIVER, ipl, "bpf_filter"); 2192 2193 static int ipl_init(void *); 2194 static int ipl_fini(void *); 2195 static int ipl_modcmd(modcmd_t, void *); 2196 2197 #ifdef _MODULE 2198 static devmajor_t ipl_cmaj = -1, ipl_bmaj = -1; 2199 #endif 2200 2201 static int 2202 ipl_modcmd(modcmd_t cmd, void *opaque) 2203 { 2204 2205 switch (cmd) { 2206 case MODULE_CMD_INIT: 2207 return ipl_init(opaque); 2208 case MODULE_CMD_FINI: 2209 return ipl_fini(opaque); 2210 default: 2211 return ENOTTY; 2212 } 2213 } 2214 2215 static int 2216 ipl_init(void *opaque) 2217 { 2218 int error; 2219 2220 ipf_listener = kauth_listen_scope(KAUTH_SCOPE_NETWORK, 2221 ipf_listener_cb, NULL); 2222 2223 if ((error = ipf_load_all()) != 0) 2224 return error; 2225 2226 if (ipf_create_all(&ipfmain) == NULL) { 2227 ipf_unload_all(); 2228 return ENODEV; 2229 } 2230 2231 /* Initialize our mutex and reference count */ 2232 mutex_init(&ipf_ref_mutex, MUTEX_DEFAULT, IPL_NONE); 2233 ipf_active = 0; 2234 2235 #ifdef _MODULE 2236 /* 2237 * Insert ourself into the cdevsw list. 2238 */ 2239 error = devsw_attach("ipl", NULL, &ipl_bmaj, &ipl_cdevsw, &ipl_cmaj); 2240 if (error) 2241 ipl_fini(opaque); 2242 #endif 2243 2244 return error; 2245 } 2246 2247 static int 2248 ipl_fini(void *opaque) 2249 { 2250 2251 #ifdef _MODULE 2252 (void)devsw_detach(NULL, &ipl_cdevsw); 2253 #endif 2254 2255 /* 2256 * Grab the mutex, verify that there are no references 2257 * and that there are no running filters. If either 2258 * of these exists, reinsert our cdevsw entry and return 2259 * an error. 2260 */ 2261 mutex_enter(&ipf_ref_mutex); 2262 if (ipf_active != 0 || ipfmain.ipf_running > 0) { 2263 #ifdef _MODULE 2264 (void)devsw_attach("ipl", NULL, &ipl_bmaj, 2265 &ipl_cdevsw, &ipl_cmaj); 2266 #endif 2267 mutex_exit(&ipf_ref_mutex); 2268 return EBUSY; 2269 } 2270 2271 /* Clean up the rest of our state before being unloaded */ 2272 2273 mutex_exit(&ipf_ref_mutex); 2274 mutex_destroy(&ipf_ref_mutex); 2275 ipf_destroy_all(&ipfmain); 2276 ipf_unload_all(); 2277 kauth_unlisten_scope(ipf_listener); 2278 2279 return 0; 2280 } 2281 #endif /* (__NetBSD_Version__ >= 799003000) */ 2282
Indexes created Sat Oct 11 08:10:02 GMT 2025