ip_fil_netbsd.c revision 1.26
1 /* $NetBSD: ip_fil_netbsd.c,v 1.26 2017/07/23 06:19:00 christos 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 1.26 2017/07/23 06:19:00 christos 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 61 #include <net/if.h> 62 #include <net/route.h> 63 #include <netinet/in.h> 64 #include <netinet/in_var.h> 65 #include <netinet/in_systm.h> 66 #include <netinet/ip.h> 67 #include <netinet/ip_var.h> 68 #include <netinet/tcp.h> 69 #if __NetBSD_Version__ >= 105190000 /* 1.5T */ 70 # include <netinet/tcp_timer.h> 71 # include <netinet/tcp_var.h> 72 #endif 73 #include <netinet/udp.h> 74 #include <netinet/tcpip.h> 75 #include <netinet/ip_icmp.h> 76 #include "netinet/ip_compat.h" 77 #ifdef USE_INET6 78 # include <netinet/icmp6.h> 79 # if (__NetBSD_Version__ >= 106000000) 80 # include <netinet6/nd6.h> 81 # endif 82 # if __NetBSD_Version__ >= 499001100 83 # include <netinet6/scope6_var.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 .d_open = ipfopen, 145 .d_close = ipfclose, 146 .d_read = ipfread, 147 .d_write = ipfwrite, 148 .d_ioctl = ipfioctl, 149 .d_stop = nostop, 150 .d_tty = notty, 151 .d_poll = ipfpoll, 152 .d_mmap = nommap, 153 #if (__NetBSD_Version__ >= 200000000) 154 .d_kqfilter = nokqfilter, 155 #endif 156 .d_discard = nodiscard, 157 #ifdef D_OTHER 158 .d_flag = D_OTHER 159 #else 160 .d_flag = 0 161 #endif 162 }; 163 #if (__NetBSD_Version__ >= 799003000) 164 kmutex_t ipf_ref_mutex; 165 int ipf_active; 166 #endif 167 168 ipf_main_softc_t ipfmain; 169 170 static u_short ipid = 0; 171 static int (*ipf_savep)(void *, ip_t *, int, void *, int, struct mbuf **); 172 static int ipf_send_ip(fr_info_t *, mb_t *); 173 #ifdef USE_INET6 174 static int ipf_fastroute6(struct mbuf *, struct mbuf **, 175 fr_info_t *, frdest_t *); 176 #endif 177 178 #if defined(NETBSD_PF) 179 # include <net/pfil.h> 180 /* 181 * We provide the ipf_checkp name just to minimize changes later. 182 */ 183 int (*ipf_checkp)(void *, ip_t *ip, int hlen, void *ifp, int out, mb_t **mp); 184 #endif /* NETBSD_PF */ 185 186 #if defined(__NetBSD_Version__) && (__NetBSD_Version__ >= 105110000) 187 # include <net/pfil.h> 188 189 static int ipf_check_wrapper(void *, struct mbuf **, struct ifnet *, int ); 190 191 static int 192 ipf_check_wrapper(void *arg, struct mbuf **mp, struct ifnet *ifp, int dir) 193 { 194 struct ip *ip; 195 int rv, hlen; 196 197 #if __NetBSD_Version__ >= 200080000 198 /* 199 * ensure that mbufs are writable beforehand 200 * as it's assumed by ipf code. 201 * XXX inefficient 202 */ 203 int error = m_makewritable(mp, 0, M_COPYALL, M_DONTWAIT); 204 205 if (error) { 206 m_freem(*mp); 207 *mp = NULL; 208 return error; 209 } 210 #endif 211 ip = mtod(*mp, struct ip *); 212 hlen = ip->ip_hl << 2; 213 214 #ifdef INET 215 #if defined(M_CSUM_TCPv4) 216 /* 217 * If the packet is out-bound, we can't delay checksums 218 * here. For in-bound, the checksum has already been 219 * validated. 220 */ 221 if (dir == PFIL_OUT) { 222 if ((*mp)->m_pkthdr.csum_flags & (M_CSUM_TCPv4|M_CSUM_UDPv4)) { 223 in_delayed_cksum(*mp); 224 (*mp)->m_pkthdr.csum_flags &= 225 ~(M_CSUM_TCPv4|M_CSUM_UDPv4); 226 } 227 } 228 #endif /* M_CSUM_TCPv4 */ 229 #endif /* INET */ 230 231 /* 232 * Note, we don't need to update the checksum, because 233 * it has already been verified. 234 */ 235 rv = ipf_check(&ipfmain, ip, hlen, ifp, (dir == PFIL_OUT), mp); 236 237 return (rv); 238 } 239 240 # ifdef USE_INET6 241 # include <netinet/ip6.h> 242 243 static int ipf_check_wrapper6(void *, struct mbuf **, struct ifnet *, int ); 244 245 static int 246 ipf_check_wrapper6(void *arg, struct mbuf **mp, struct ifnet *ifp, int dir) 247 { 248 #if defined(INET6) 249 # if defined(M_CSUM_TCPv6) && (__NetBSD_Version__ > 200000000) 250 /* 251 * If the packet is out-bound, we can't delay checksums 252 * here. For in-bound, the checksum has already been 253 * validated. 254 */ 255 if (dir == PFIL_OUT) { 256 if ((*mp)->m_pkthdr.csum_flags & (M_CSUM_TCPv6|M_CSUM_UDPv6)) { 257 # if (__NetBSD_Version__ > 399000600) 258 in6_delayed_cksum(*mp); 259 # endif 260 (*mp)->m_pkthdr.csum_flags &= ~(M_CSUM_TCPv6| 261 M_CSUM_UDPv6); 262 } 263 } 264 # endif 265 #endif /* INET6 */ 266 267 return (ipf_check(&ipfmain, mtod(*mp, struct ip *), sizeof(struct ip6_hdr), 268 ifp, (dir == PFIL_OUT), mp)); 269 } 270 # endif 271 272 273 # if defined(PFIL_TYPE_IFNET) && defined(PFIL_IFNET) 274 275 # if (__NetBSD_Version__ >= 799000400) 276 277 static void ipf_pfilsync(void *, unsigned long, void *); 278 279 static void 280 ipf_pfilsync(void *hdr, unsigned long cmd, void *arg2) 281 { 282 /* 283 * The interface pointer is useless for create (we have nothing to 284 * compare it to) and at detach, the interface name is still in the 285 * list of active NICs (albeit, down, but that's not any real 286 * indicator) and doing ifunit() on the name will still return the 287 * pointer, so it's not much use then, either. 288 */ 289 ipf_sync(&ipfmain, NULL); 290 } 291 292 # else 293 294 static int ipf_pfilsync(void *, struct mbuf **, struct ifnet *, int); 295 296 static int 297 ipf_pfilsync(void *hdr, struct mbuf **mp, struct ifnet *ifp, int dir) 298 { 299 ipf_sync(&ipfmain, NULL); 300 return 0; 301 } 302 303 # endif 304 # endif 305 306 #endif /* __NetBSD_Version__ >= 105110000 */ 307 308 309 #if defined(IPFILTER_LKM) 310 int 311 ipf_identify(s) 312 char *s; 313 { 314 if (strcmp(s, "ipl") == 0) 315 return 1; 316 return 0; 317 } 318 #endif /* IPFILTER_LKM */ 319 320 #if (__NetBSD_Version__ >= 599002000) 321 static int 322 ipf_listener_cb(kauth_cred_t cred, kauth_action_t action, void *cookie, 323 void *arg0, void *arg1, void *arg2, void *arg3) 324 { 325 int result; 326 enum kauth_network_req req; 327 328 result = KAUTH_RESULT_DEFER; 329 req = (enum kauth_network_req)arg0; 330 331 if (action != KAUTH_NETWORK_FIREWALL) 332 return result; 333 334 /* These must have came from device context. */ 335 if ((req == KAUTH_REQ_NETWORK_FIREWALL_FW) || 336 (req == KAUTH_REQ_NETWORK_FIREWALL_NAT)) 337 result = KAUTH_RESULT_ALLOW; 338 339 return result; 340 } 341 #endif 342 343 /* 344 * Try to detect the case when compiling for NetBSD with pseudo-device 345 */ 346 void 347 ipfilterattach(int count) 348 { 349 350 #if (__NetBSD_Version__ >= 799003000) 351 return; 352 #else 353 #if (__NetBSD_Version__ >= 599002000) 354 ipf_listener = kauth_listen_scope(KAUTH_SCOPE_NETWORK, 355 ipf_listener_cb, NULL); 356 #endif 357 358 if (ipf_load_all() == 0) 359 (void) ipf_create_all(&ipfmain); 360 #endif 361 } 362 363 364 int 365 ipfattach(ipf_main_softc_t *softc) 366 { 367 SPL_INT(s); 368 #if (__NetBSD_Version__ >= 499005500) 369 int i; 370 #endif 371 #if defined(NETBSD_PF) && (__NetBSD_Version__ >= 104200000) 372 int error = 0; 373 # if defined(__NetBSD_Version__) && (__NetBSD_Version__ >= 105110000) 374 pfil_head_t *ph_inet; 375 # ifdef USE_INET6 376 pfil_head_t *ph_inet6; 377 # endif 378 # if defined(PFIL_TYPE_IFNET) && defined(PFIL_IFNET) 379 pfil_head_t *ph_ifsync; 380 # endif 381 # endif 382 #endif 383 384 SPL_NET(s); 385 if ((softc->ipf_running > 0) || (ipf_checkp == ipf_check)) { 386 printf("IP Filter: already initialized\n"); 387 SPL_X(s); 388 IPFERROR(130017); 389 return EBUSY; 390 } 391 392 if (ipf_init_all(softc) < 0) { 393 SPL_X(s); 394 IPFERROR(130015); 395 return EIO; 396 } 397 398 #ifdef NETBSD_PF 399 # if (__NetBSD_Version__ >= 104200000) 400 # if __NetBSD_Version__ >= 105110000 401 ph_inet = pfil_head_get(PFIL_TYPE_AF, (void *)AF_INET); 402 # ifdef USE_INET6 403 ph_inet6 = pfil_head_get(PFIL_TYPE_AF, (void *)AF_INET6); 404 # endif 405 # if defined(PFIL_TYPE_IFNET) && defined(PFIL_IFNET) 406 ph_ifsync = pfil_head_get(PFIL_TYPE_IFNET, 0); 407 # endif 408 409 if (ph_inet == NULL 410 # ifdef USE_INET6 411 && ph_inet6 == NULL 412 # endif 413 # if defined(PFIL_TYPE_IFNET) && defined(PFIL_IFNET) 414 && ph_ifsync == NULL 415 # endif 416 ) { 417 SPL_X(s); 418 IPFERROR(130016); 419 return ENODEV; 420 } 421 422 if (ph_inet != NULL) 423 error = pfil_add_hook((void *)ipf_check_wrapper, NULL, 424 PFIL_IN|PFIL_OUT, ph_inet); 425 else 426 error = 0; 427 # else 428 error = pfil_add_hook((void *)ipf_check, PFIL_IN|PFIL_OUT, 429 &inetsw[ip_protox[IPPROTO_IP]].pr_pfh); 430 # endif 431 if (error) { 432 IPFERROR(130013); 433 goto pfil_error; 434 } 435 # else 436 pfil_add_hook((void *)ipf_check, PFIL_IN|PFIL_OUT); 437 # endif 438 439 # ifdef USE_INET6 440 # if __NetBSD_Version__ >= 105110000 441 if (ph_inet6 != NULL) 442 error = pfil_add_hook((void *)ipf_check_wrapper6, NULL, 443 PFIL_IN|PFIL_OUT, ph_inet6); 444 else 445 error = 0; 446 if (error) { 447 pfil_remove_hook((void *)ipf_check_wrapper6, NULL, 448 PFIL_IN|PFIL_OUT, ph_inet6); 449 ipfmain.ipf_interror = 130014; 450 goto pfil_error; 451 } 452 # else 453 error = pfil_add_hook((void *)ipf_check, PFIL_IN|PFIL_OUT, 454 &inetsw[ip_protox[IPPROTO_IPV6]].pr_pfh); 455 if (error) { 456 pfil_remove_hook((void *)ipf_check, PFIL_IN|PFIL_OUT, 457 &inetsw[ip_protox[IPPROTO_IP]].pr_pfh); 458 IPFERROR(130014); 459 goto pfil_error; 460 } 461 # endif 462 # endif 463 464 # if defined(PFIL_TYPE_IFNET) && defined(PFIL_IFNET) 465 if (ph_ifsync != NULL) 466 #if (__NetBSD_Version__ >= 799000400) 467 (void) pfil_add_ihook((void *)ipf_pfilsync, NULL, 468 PFIL_IFNET, ph_ifsync); 469 #else 470 (void) pfil_add_hook((void *)ipf_pfilsync, NULL, 471 PFIL_IFNET, ph_ifsync); 472 #endif 473 # endif 474 #endif 475 476 #if (__NetBSD_Version__ >= 499005500) 477 for (i = 0; i < IPL_LOGSIZE; i++) 478 selinit(&ipfmain.ipf_selwait[i]); 479 #else 480 bzero((char *)ipfmain.ipf_selwait, sizeof(ipfmain.ipf_selwait)); 481 #endif 482 ipf_savep = ipf_checkp; 483 ipf_checkp = ipf_check; 484 485 #ifdef INET 486 if (softc->ipf_control_forwarding & 1) 487 ipforwarding = 1; 488 #endif 489 490 ipid = 0; 491 492 SPL_X(s); 493 494 #if (__NetBSD_Version__ >= 104010000) 495 # if (__NetBSD_Version__ >= 499002000) 496 callout_init(&softc->ipf_slow_ch, 0); 497 # else 498 callout_init(&softc->ipf_slow_ch); 499 # endif 500 callout_reset(&softc->ipf_slow_ch, (hz / IPF_HZ_DIVIDE) * IPF_HZ_MULT, 501 ipf_timer_func, softc); 502 #else 503 timeout(ipf_timer_func, softc, (hz / IPF_HZ_DIVIDE) * IPF_HZ_MULT); 504 #endif 505 506 return 0; 507 508 #if __NetBSD_Version__ >= 105110000 509 pfil_error: 510 SPL_X(s); 511 ipf_fini_all(softc); 512 return error; 513 #endif 514 } 515 516 static void 517 ipf_timer_func(void *ptr) 518 { 519 ipf_main_softc_t *softc = ptr; 520 SPL_INT(s); 521 522 SPL_NET(s); 523 READ_ENTER(&softc->ipf_global); 524 525 if (softc->ipf_running > 0) 526 ipf_slowtimer(softc); 527 528 if (softc->ipf_running == -1 || softc->ipf_running == 1) { 529 #if NETBSD_GE_REV(104240000) 530 callout_reset(&softc->ipf_slow_ch, hz / 2, 531 ipf_timer_func, softc); 532 #else 533 timeout(ipf_timer_func, softc, 534 (hz / IPF_HZ_DIVIDE) * IPF_HZ_MULT); 535 #endif 536 } 537 RWLOCK_EXIT(&softc->ipf_global); 538 SPL_X(s); 539 } 540 541 542 /* 543 * Disable the filter by removing the hooks from the IP input/output 544 * stream. 545 */ 546 int 547 ipfdetach(ipf_main_softc_t *softc) 548 { 549 SPL_INT(s); 550 #if (__NetBSD_Version__ >= 499005500) 551 int i; 552 #endif 553 #if defined(NETBSD_PF) && (__NetBSD_Version__ >= 104200000) 554 int error = 0; 555 # if __NetBSD_Version__ >= 105150000 556 pfil_head_t *ph_inet = pfil_head_get(PFIL_TYPE_AF, (void *)AF_INET); 557 # ifdef USE_INET6 558 pfil_head_t *ph_inet6 = pfil_head_get(PFIL_TYPE_AF, (void *)AF_INET6); 559 # endif 560 # if defined(PFIL_TYPE_IFNET) && defined(PFIL_IFNET) 561 struct pfil_head *ph_ifsync = pfil_head_get(PFIL_TYPE_IFNET, 0); 562 # endif 563 # endif 564 #endif 565 566 SPL_NET(s); 567 568 #if (__NetBSD_Version__ >= 104010000) 569 if (softc->ipf_running > 0) 570 callout_stop(&softc->ipf_slow_ch); 571 #else 572 untimeout(ipf_slowtimer, NULL); 573 #endif /* NetBSD */ 574 575 ipf_checkp = ipf_savep; 576 (void) ipf_flush(softc, IPL_LOGIPF, FR_INQUE|FR_OUTQUE|FR_INACTIVE); 577 (void) ipf_flush(softc, IPL_LOGIPF, FR_INQUE|FR_OUTQUE); 578 579 #ifdef INET 580 if (softc->ipf_control_forwarding & 2) 581 ipforwarding = 0; 582 #endif 583 584 #ifdef NETBSD_PF 585 # if (__NetBSD_Version__ >= 104200000) 586 # if __NetBSD_Version__ >= 105110000 587 # if defined(PFIL_TYPE_IFNET) && defined(PFIL_IFNET) 588 # if __NetBSD_Version__ >= 799000400 589 (void) pfil_remove_ihook((void *)ipf_pfilsync, NULL, 590 PFIL_IFNET, ph_ifsync); 591 # else 592 (void) pfil_remove_hook((void *)ipf_pfilsync, NULL, 593 PFIL_IFNET, ph_ifsync); 594 # endif 595 # endif 596 597 if (ph_inet != NULL) 598 error = pfil_remove_hook((void *)ipf_check_wrapper, NULL, 599 PFIL_IN|PFIL_OUT, ph_inet); 600 else 601 error = 0; 602 # else 603 error = pfil_remove_hook((void *)ipf_check, PFIL_IN|PFIL_OUT, 604 &inetsw[ip_protox[IPPROTO_IP]].pr_pfh); 605 # endif 606 if (error) { 607 SPL_X(s); 608 IPFERROR(130011); 609 return error; 610 } 611 # else 612 pfil_remove_hook((void *)ipf_check, PFIL_IN|PFIL_OUT); 613 # endif 614 # ifdef USE_INET6 615 # if __NetBSD_Version__ >= 105110000 616 if (ph_inet6 != NULL) 617 error = pfil_remove_hook((void *)ipf_check_wrapper6, NULL, 618 PFIL_IN|PFIL_OUT, ph_inet6); 619 else 620 error = 0; 621 # else 622 error = pfil_remove_hook((void *)ipf_check, PFIL_IN|PFIL_OUT, 623 &inetsw[ip_protox[IPPROTO_IPV6]].pr_pfh); 624 # endif 625 if (error) { 626 SPL_X(s); 627 IPFERROR(130012); 628 return error; 629 } 630 # endif 631 #endif 632 SPL_X(s); 633 634 #if (__NetBSD_Version__ >= 499005500) 635 for (i = 0; i < IPL_LOGSIZE; i++) 636 seldestroy(&ipfmain.ipf_selwait[i]); 637 #endif 638 639 ipf_fini_all(softc); 640 641 return 0; 642 } 643 644 645 /* 646 * Filter ioctl interface. 647 */ 648 int 649 ipfioctl(dev_t dev, u_long cmd, 650 #if (__NetBSD_Version__ >= 499001000) 651 void *data, 652 #else 653 caddr_t data, 654 #endif 655 int mode 656 #if (NetBSD >= 199511) 657 # if (__NetBSD_Version__ >= 399001400) 658 , struct lwp *p 659 # if (__NetBSD_Version__ >= 399002000) 660 # define UID(l) kauth_cred_getuid((l)->l_cred) 661 # else 662 # define UID(l) ((l)->l_proc->p_cred->p_ruid) 663 # endif 664 # else 665 , struct proc *p 666 # define UID(p) ((p)->p_cred->p_ruid) 667 # endif 668 #endif 669 ) 670 { 671 int error = 0, unit = 0; 672 SPL_INT(s); 673 674 #if (__NetBSD_Version__ >= 399002000) 675 if ((mode & FWRITE) && 676 kauth_authorize_network(p->l_cred, KAUTH_NETWORK_FIREWALL, 677 KAUTH_REQ_NETWORK_FIREWALL_FW, NULL, 678 NULL, NULL)) { 679 ipfmain.ipf_interror = 130005; 680 return EPERM; 681 } 682 #else 683 if ((securelevel >= 2) && (mode & FWRITE)) { 684 ipfmain.ipf_interror = 130001; 685 return EPERM; 686 } 687 #endif 688 689 unit = GET_MINOR(dev); 690 if ((IPL_LOGMAX < unit) || (unit < 0)) { 691 ipfmain.ipf_interror = 130002; 692 return ENXIO; 693 } 694 695 if (ipfmain.ipf_running <= 0) { 696 if (unit != IPL_LOGIPF && cmd != SIOCIPFINTERROR) { 697 ipfmain.ipf_interror = 130003; 698 return EIO; 699 } 700 if (cmd != SIOCIPFGETNEXT && cmd != SIOCIPFGET && 701 cmd != SIOCIPFSET && cmd != SIOCFRENB && 702 cmd != SIOCGETFS && cmd != SIOCGETFF && 703 cmd != SIOCIPFINTERROR) { 704 ipfmain.ipf_interror = 130004; 705 return EIO; 706 } 707 } 708 709 SPL_NET(s); 710 711 error = ipf_ioctlswitch(&ipfmain, unit, data, cmd, mode, UID(p), p); 712 if (error != -1) { 713 SPL_X(s); 714 return error; 715 } 716 717 SPL_X(s); 718 return error; 719 } 720 721 722 /* 723 * ipf_send_reset - this could conceivably be a call to tcp_respond(), but that 724 * requires a large amount of setting up and isn't any more efficient. 725 */ 726 int 727 ipf_send_reset(fr_info_t *fin) 728 { 729 struct tcphdr *tcp, *tcp2; 730 int tlen = 0, hlen; 731 struct mbuf *m; 732 #ifdef USE_INET6 733 ip6_t *ip6; 734 #endif 735 ip_t *ip; 736 737 tcp = fin->fin_dp; 738 if (tcp->th_flags & TH_RST) 739 return -1; /* feedback loop */ 740 741 if (ipf_checkl4sum(fin) == -1) 742 return -1; 743 744 tlen = fin->fin_dlen - (TCP_OFF(tcp) << 2) + 745 ((tcp->th_flags & TH_SYN) ? 1 : 0) + 746 ((tcp->th_flags & TH_FIN) ? 1 : 0); 747 748 #ifdef USE_INET6 749 hlen = (fin->fin_v == 6) ? sizeof(ip6_t) : sizeof(ip_t); 750 #else 751 hlen = sizeof(ip_t); 752 #endif 753 #ifdef MGETHDR 754 MGETHDR(m, M_DONTWAIT, MT_HEADER); 755 #else 756 MGET(m, M_DONTWAIT, MT_HEADER); 757 #endif 758 if (m == NULL) 759 return -1; 760 if (sizeof(*tcp2) + hlen > MHLEN) { 761 MCLGET(m, M_DONTWAIT); 762 if (m == NULL) 763 return -1; 764 if ((m->m_flags & M_EXT) == 0) { 765 FREE_MB_T(m); 766 return -1; 767 } 768 } 769 770 m->m_len = sizeof(*tcp2) + hlen; 771 m->m_data += max_linkhdr; 772 m->m_pkthdr.len = m->m_len; 773 m_reset_rcvif(m); 774 ip = mtod(m, struct ip *); 775 bzero((char *)ip, hlen); 776 #ifdef USE_INET6 777 ip6 = (ip6_t *)ip; 778 #endif 779 bzero((char *)ip, sizeof(*tcp2) + hlen); 780 tcp2 = (struct tcphdr *)((char *)ip + hlen); 781 tcp2->th_sport = tcp->th_dport; 782 tcp2->th_dport = tcp->th_sport; 783 784 if (tcp->th_flags & TH_ACK) { 785 tcp2->th_seq = tcp->th_ack; 786 tcp2->th_flags = TH_RST; 787 tcp2->th_ack = 0; 788 } else { 789 tcp2->th_seq = 0; 790 tcp2->th_ack = ntohl(tcp->th_seq); 791 tcp2->th_ack += tlen; 792 tcp2->th_ack = htonl(tcp2->th_ack); 793 tcp2->th_flags = TH_RST|TH_ACK; 794 } 795 tcp2->th_x2 = 0; 796 TCP_OFF_A(tcp2, sizeof(*tcp2) >> 2); 797 tcp2->th_win = tcp->th_win; 798 tcp2->th_sum = 0; 799 tcp2->th_urp = 0; 800 801 #ifdef USE_INET6 802 if (fin->fin_v == 6) { 803 ip6->ip6_flow = ((ip6_t *)fin->fin_ip)->ip6_flow; 804 ip6->ip6_plen = htons(sizeof(struct tcphdr)); 805 ip6->ip6_nxt = IPPROTO_TCP; 806 ip6->ip6_hlim = 0; 807 ip6->ip6_src = fin->fin_dst6.in6; 808 ip6->ip6_dst = fin->fin_src6.in6; 809 tcp2->th_sum = in6_cksum(m, IPPROTO_TCP, 810 sizeof(*ip6), sizeof(*tcp2)); 811 return ipf_send_ip(fin, m); 812 } 813 #endif 814 #ifdef INET 815 ip->ip_p = IPPROTO_TCP; 816 ip->ip_len = htons(sizeof(struct tcphdr)); 817 ip->ip_src.s_addr = fin->fin_daddr; 818 ip->ip_dst.s_addr = fin->fin_saddr; 819 tcp2->th_sum = in_cksum(m, hlen + sizeof(*tcp2)); 820 ip->ip_len = hlen + sizeof(*tcp2); 821 return ipf_send_ip(fin, m); 822 #else 823 return 0; 824 #endif 825 } 826 827 828 /* 829 * Expects ip_len to be in host byte order when called. 830 */ 831 static int 832 ipf_send_ip(fr_info_t *fin, mb_t *m) 833 { 834 fr_info_t fnew; 835 #ifdef INET 836 ip_t *oip; 837 #endif 838 ip_t *ip; 839 int hlen; 840 841 ip = mtod(m, ip_t *); 842 bzero((char *)&fnew, sizeof(fnew)); 843 fnew.fin_main_soft = fin->fin_main_soft; 844 845 IP_V_A(ip, fin->fin_v); 846 switch (fin->fin_v) 847 { 848 #ifdef INET 849 case 4 : 850 oip = fin->fin_ip; 851 hlen = sizeof(*oip); 852 fnew.fin_v = 4; 853 fnew.fin_p = ip->ip_p; 854 fnew.fin_plen = ntohs(ip->ip_len); 855 HTONS(ip->ip_len); 856 IP_HL_A(ip, sizeof(*oip) >> 2); 857 ip->ip_tos = oip->ip_tos; 858 ip->ip_id = ipf_nextipid(fin); 859 ip->ip_off = htons(ip_mtudisc ? IP_DF : 0); 860 ip->ip_ttl = ip_defttl; 861 ip->ip_sum = 0; 862 break; 863 #endif 864 #ifdef USE_INET6 865 case 6 : 866 { 867 ip6_t *ip6 = (ip6_t *)ip; 868 869 ip6->ip6_vfc = 0x60; 870 ip6->ip6_hlim = IPDEFTTL; 871 872 hlen = sizeof(*ip6); 873 fnew.fin_p = ip6->ip6_nxt; 874 fnew.fin_v = 6; 875 fnew.fin_plen = ntohs(ip6->ip6_plen) + hlen; 876 break; 877 } 878 #endif 879 default : 880 return EINVAL; 881 } 882 #ifdef KAME_IPSEC 883 m_reset_rcvif(m); 884 #endif 885 886 fnew.fin_ifp = fin->fin_ifp; 887 fnew.fin_flx = FI_NOCKSUM; 888 fnew.fin_m = m; 889 fnew.fin_ip = ip; 890 fnew.fin_mp = &m; 891 fnew.fin_hlen = hlen; 892 fnew.fin_dp = (char *)ip + hlen; 893 (void) ipf_makefrip(hlen, ip, &fnew); 894 895 return ipf_fastroute(m, &m, &fnew, NULL); 896 } 897 898 899 int 900 ipf_send_icmp_err(int type, fr_info_t *fin, int dst) 901 { 902 int err, hlen, xtra, iclen, ohlen, avail; 903 struct in_addr dst4; 904 struct icmp *icmp; 905 struct mbuf *m; 906 i6addr_t dst6; 907 void *ifp; 908 #ifdef USE_INET6 909 int code; 910 ip6_t *ip6; 911 #endif 912 ip_t *ip, *ip2; 913 914 if ((type < 0) || (type > ICMP_MAXTYPE)) 915 return -1; 916 917 #ifdef USE_INET6 918 code = fin->fin_icode; 919 if ((code < 0) || (code >= sizeof(icmptoicmp6unreach)/sizeof(int))) 920 return -1; 921 #endif 922 923 if (ipf_checkl4sum(fin) == -1) 924 return -1; 925 #ifdef MGETHDR 926 MGETHDR(m, M_DONTWAIT, MT_HEADER); 927 #else 928 MGET(m, M_DONTWAIT, MT_HEADER); 929 #endif 930 if (m == NULL) 931 return -1; 932 avail = MHLEN; 933 934 xtra = 0; 935 hlen = 0; 936 ohlen = 0; 937 dst4.s_addr = 0; 938 ifp = fin->fin_ifp; 939 if (fin->fin_v == 4) { 940 if ((fin->fin_p == IPPROTO_ICMP) && !(fin->fin_flx & FI_SHORT)) 941 switch (ntohs(fin->fin_data[0]) >> 8) 942 { 943 case ICMP_ECHO : 944 case ICMP_TSTAMP : 945 case ICMP_IREQ : 946 case ICMP_MASKREQ : 947 break; 948 default : 949 FREE_MB_T(m); 950 return 0; 951 } 952 953 if (dst == 0) { 954 if (ipf_ifpaddr(&ipfmain, 4, FRI_NORMAL, ifp, 955 &dst6, NULL) == -1) { 956 FREE_MB_T(m); 957 return -1; 958 } 959 dst4 = dst6.in4; 960 } else 961 dst4.s_addr = fin->fin_daddr; 962 963 hlen = sizeof(ip_t); 964 ohlen = fin->fin_hlen; 965 iclen = hlen + offsetof(struct icmp, icmp_ip) + ohlen; 966 if (fin->fin_hlen < fin->fin_plen) 967 xtra = MIN(fin->fin_dlen, 8); 968 else 969 xtra = 0; 970 } 971 972 #ifdef USE_INET6 973 else if (fin->fin_v == 6) { 974 hlen = sizeof(ip6_t); 975 ohlen = sizeof(ip6_t); 976 iclen = hlen + offsetof(struct icmp, icmp_ip) + ohlen; 977 type = icmptoicmp6types[type]; 978 if (type == ICMP6_DST_UNREACH) 979 code = icmptoicmp6unreach[code]; 980 981 if (iclen + max_linkhdr + fin->fin_plen > avail) { 982 MCLGET(m, M_DONTWAIT); 983 if (m == NULL) 984 return -1; 985 if ((m->m_flags & M_EXT) == 0) { 986 FREE_MB_T(m); 987 return -1; 988 } 989 avail = MCLBYTES; 990 } 991 xtra = MIN(fin->fin_plen, avail - iclen - max_linkhdr); 992 xtra = MIN(xtra, IPV6_MMTU - iclen); 993 if (dst == 0 && !IN6_IS_ADDR_LINKLOCAL(&fin->fin_dst6.in6)) { 994 if (ipf_ifpaddr(&ipfmain, 6, FRI_NORMAL, ifp, 995 &dst6, NULL) == -1) { 996 FREE_MB_T(m); 997 return -1; 998 } 999 } else 1000 dst6 = fin->fin_dst6; 1001 } 1002 #endif 1003 else { 1004 FREE_MB_T(m); 1005 return -1; 1006 } 1007 1008 avail -= (max_linkhdr + iclen); 1009 if (avail < 0) { 1010 FREE_MB_T(m); 1011 return -1; 1012 } 1013 if (xtra > avail) 1014 xtra = avail; 1015 iclen += xtra; 1016 m->m_data += max_linkhdr; 1017 m_reset_rcvif(m); 1018 m->m_pkthdr.len = iclen; 1019 m->m_len = iclen; 1020 ip = mtod(m, ip_t *); 1021 icmp = (struct icmp *)((char *)ip + hlen); 1022 ip2 = (ip_t *)&icmp->icmp_ip; 1023 1024 icmp->icmp_type = type; 1025 icmp->icmp_code = fin->fin_icode; 1026 icmp->icmp_cksum = 0; 1027 #ifdef icmp_nextmtu 1028 if (type == ICMP_UNREACH && fin->fin_icode == ICMP_UNREACH_NEEDFRAG) { 1029 if (fin->fin_mtu != 0) { 1030 icmp->icmp_nextmtu = htons(fin->fin_mtu); 1031 1032 } else if (ifp != NULL) { 1033 icmp->icmp_nextmtu = htons(GETIFMTU_4(ifp)); 1034 1035 } else { /* make up a number... */ 1036 icmp->icmp_nextmtu = htons(fin->fin_plen - 20); 1037 } 1038 } 1039 #endif 1040 1041 bcopy((char *)fin->fin_ip, (char *)ip2, ohlen); 1042 1043 #if defined(M_CSUM_IPv4) 1044 /* 1045 * Clear any in-bound checksum flags for this packet. 1046 */ 1047 m->m_pkthdr.csuminfo = 0; 1048 #endif /* __NetBSD__ && M_CSUM_IPv4 */ 1049 1050 #ifdef USE_INET6 1051 ip6 = (ip6_t *)ip; 1052 if (fin->fin_v == 6) { 1053 ip6->ip6_flow = ((ip6_t *)fin->fin_ip)->ip6_flow; 1054 ip6->ip6_plen = htons(iclen - hlen); 1055 ip6->ip6_nxt = IPPROTO_ICMPV6; 1056 ip6->ip6_hlim = 0; 1057 ip6->ip6_src = dst6.in6; 1058 ip6->ip6_dst = fin->fin_src6.in6; 1059 if (xtra > 0) 1060 bcopy((char *)fin->fin_ip + ohlen, 1061 (char *)&icmp->icmp_ip + ohlen, xtra); 1062 icmp->icmp_cksum = in6_cksum(m, IPPROTO_ICMPV6, 1063 sizeof(*ip6), iclen - hlen); 1064 } else 1065 #endif 1066 { 1067 ip->ip_p = IPPROTO_ICMP; 1068 ip->ip_src.s_addr = dst4.s_addr; 1069 ip->ip_dst.s_addr = fin->fin_saddr; 1070 1071 if (xtra > 0) 1072 bcopy((char *)fin->fin_ip + ohlen, 1073 (char *)&icmp->icmp_ip + ohlen, xtra); 1074 icmp->icmp_cksum = ipf_cksum((u_short *)icmp, 1075 sizeof(*icmp) + 8); 1076 ip->ip_len = iclen; 1077 ip->ip_p = IPPROTO_ICMP; 1078 } 1079 err = ipf_send_ip(fin, m); 1080 return err; 1081 } 1082 1083 1084 /* 1085 * m0 - pointer to mbuf where the IP packet starts 1086 * mpp - pointer to the mbuf pointer that is the start of the mbuf chain 1087 */ 1088 int 1089 ipf_fastroute(mb_t *m0, mb_t **mpp, fr_info_t *fin, frdest_t *fdp) 1090 { 1091 register struct ip *ip, *mhip; 1092 register struct mbuf *m = *mpp; 1093 register struct route *ro; 1094 int len, off, error = 0, hlen, code; 1095 struct ifnet *ifp, *sifp; 1096 ipf_main_softc_t *softc; 1097 #if __NetBSD_Version__ >= 499001100 1098 union { 1099 struct sockaddr dst; 1100 struct sockaddr_in dst4; 1101 } u; 1102 #else 1103 struct sockaddr_in *dst4; 1104 #endif 1105 struct sockaddr *dst; 1106 u_short ip_off, ip_len; 1107 struct route iproute; 1108 struct rtentry *rt; 1109 frdest_t node; 1110 frentry_t *fr; 1111 1112 if (fin->fin_v == 6) { 1113 #ifdef USE_INET6 1114 error = ipf_fastroute6(m0, mpp, fin, fdp); 1115 #else 1116 error = EPROTONOSUPPORT; 1117 #endif 1118 if ((error != 0) && (*mpp != NULL)) 1119 FREE_MB_T(*mpp); 1120 return error; 1121 } 1122 #ifndef INET 1123 FREE_MB_T(*mpp); 1124 return EPROTONOSUPPORT; 1125 #else 1126 1127 hlen = fin->fin_hlen; 1128 ip = mtod(m0, struct ip *); 1129 softc = fin->fin_main_soft; 1130 rt = NULL; 1131 ifp = NULL; 1132 1133 # if defined(M_CSUM_IPv4) 1134 /* 1135 * Clear any in-bound checksum flags for this packet. 1136 */ 1137 m0->m_pkthdr.csuminfo = 0; 1138 # endif /* __NetBSD__ && M_CSUM_IPv4 */ 1139 1140 /* 1141 * Route packet. 1142 */ 1143 ro = &iproute; 1144 memset(ro, 0, sizeof(*ro)); 1145 fr = fin->fin_fr; 1146 1147 if ((fr != NULL) && !(fr->fr_flags & FR_KEEPSTATE) && (fdp != NULL) && 1148 (fdp->fd_type == FRD_DSTLIST)) { 1149 if (ipf_dstlist_select_node(fin, fdp->fd_ptr, NULL, &node) == 0) 1150 fdp = &node; 1151 } 1152 if (fdp != NULL) 1153 ifp = fdp->fd_ptr; 1154 else 1155 ifp = fin->fin_ifp; 1156 1157 if ((ifp == NULL) && ((fr == NULL) || !(fr->fr_flags & FR_FASTROUTE))) { 1158 error = -2; 1159 goto bad; 1160 } 1161 1162 # if __NetBSD_Version__ >= 499001100 1163 if ((fdp != NULL) && (fdp->fd_ip.s_addr != 0)) 1164 sockaddr_in_init(&u.dst4, &fdp->fd_ip, 0); 1165 else 1166 sockaddr_in_init(&u.dst4, &ip->ip_dst, 0); 1167 dst = &u.dst; 1168 rtcache_setdst(ro, dst); 1169 rt = rtcache_init(ro); 1170 # else 1171 dst4 = (struct sockaddr_in *)&ro->ro_dst; 1172 dst = (struct sockaddr *)dst4; 1173 dst4->sin_family = AF_INET; 1174 dst4->sin_addr = ip->ip_dst; 1175 1176 if ((fdp != NULL) && (fdp->fd_ip.s_addr != 0)) 1177 dst4->sin_addr = fdp->fd_ip; 1178 1179 dst4->sin_len = sizeof(*dst); 1180 rtalloc(ro); 1181 rt = ro->ro_rt; 1182 # endif 1183 if ((ifp == NULL) && (rt != NULL)) 1184 ifp = rt->rt_ifp; 1185 if ((rt == NULL) || (ifp == NULL)) { 1186 #ifdef INET 1187 if (in_localaddr(ip->ip_dst)) 1188 error = EHOSTUNREACH; 1189 else 1190 #endif 1191 error = ENETUNREACH; 1192 goto bad; 1193 } 1194 1195 1196 if (rt->rt_flags & RTF_GATEWAY) 1197 dst = rt->rt_gateway; 1198 1199 rt->rt_use++; 1200 1201 /* 1202 * For input packets which are being "fastrouted", they won't 1203 * go back through output filtering and miss their chance to get 1204 * NAT'd and counted. Duplicated packets aren't considered to be 1205 * part of the normal packet stream, so do not NAT them or pass 1206 * them through stateful checking, etc. 1207 */ 1208 if ((fdp != &fr->fr_dif) && (fin->fin_out == 0)) { 1209 sifp = fin->fin_ifp; 1210 fin->fin_ifp = ifp; 1211 fin->fin_out = 1; 1212 (void) ipf_acctpkt(fin, NULL); 1213 fin->fin_fr = NULL; 1214 if (!fr || !(fr->fr_flags & FR_RETMASK)) { 1215 u_32_t pass; 1216 1217 (void) ipf_state_check(fin, &pass); 1218 } 1219 1220 switch (ipf_nat_checkout(fin, NULL)) 1221 { 1222 case 0 : 1223 break; 1224 case 1 : 1225 ip->ip_sum = 0; 1226 break; 1227 case -1 : 1228 error = -1; 1229 goto bad; 1230 break; 1231 } 1232 1233 fin->fin_ifp = sifp; 1234 fin->fin_out = 0; 1235 } else 1236 ip->ip_sum = 0; 1237 /* 1238 * If small enough for interface, can just send directly. 1239 */ 1240 m_set_rcvif(m, ifp); 1241 1242 ip_len = ntohs(ip->ip_len); 1243 if (ip_len <= ifp->if_mtu) { 1244 # if defined(M_CSUM_IPv4) 1245 # if (__NetBSD_Version__ >= 105009999) 1246 if (ifp->if_csum_flags_tx & M_CSUM_IPv4) 1247 m->m_pkthdr.csuminfo |= M_CSUM_IPv4; 1248 # else 1249 if (ifp->if_capabilities & IFCAP_CSUM_IPv4) 1250 m->m_pkthdr.csuminfo |= M_CSUM_IPv4; 1251 # endif /* (__NetBSD_Version__ >= 105009999) */ 1252 else if (ip->ip_sum == 0) 1253 ip->ip_sum = in_cksum(m, hlen); 1254 # else 1255 if (!ip->ip_sum) 1256 ip->ip_sum = in_cksum(m, hlen); 1257 # endif /* M_CSUM_IPv4 */ 1258 1259 error = if_output_lock(ifp, ifp, m, dst, rt); 1260 goto done; 1261 } 1262 1263 /* 1264 * Too large for interface; fragment if possible. 1265 * Must be able to put at least 8 bytes per fragment. 1266 */ 1267 ip_off = ntohs(ip->ip_off); 1268 if (ip_off & IP_DF) { 1269 error = EMSGSIZE; 1270 goto bad; 1271 } 1272 len = (ifp->if_mtu - hlen) &~ 7; 1273 if (len < 8) { 1274 error = EMSGSIZE; 1275 goto bad; 1276 } 1277 1278 { 1279 int mhlen, firstlen = len; 1280 struct mbuf **mnext = &m->m_act; 1281 1282 /* 1283 * Loop through length of segment after first fragment, 1284 * make new header and copy data of each part and link onto chain. 1285 */ 1286 m0 = m; 1287 mhlen = sizeof (struct ip); 1288 for (off = hlen + len; off < ip_len; off += len) { 1289 # ifdef MGETHDR 1290 MGETHDR(m, M_DONTWAIT, MT_HEADER); 1291 # else 1292 MGET(m, M_DONTWAIT, MT_HEADER); 1293 # endif 1294 if (m == 0) { 1295 m = m0; 1296 error = ENOBUFS; 1297 goto bad; 1298 } 1299 m->m_data += max_linkhdr; 1300 mhip = mtod(m, struct ip *); 1301 bcopy((char *)ip, (char *)mhip, sizeof(*ip)); 1302 #ifdef INET 1303 if (hlen > sizeof (struct ip)) { 1304 mhlen = ip_optcopy(ip, mhip) + sizeof (struct ip); 1305 IP_HL_A(mhip, mhlen >> 2); 1306 } 1307 #endif 1308 m->m_len = mhlen; 1309 mhip->ip_off = ((off - hlen) >> 3) + ip_off; 1310 if (off + len >= ip_len) 1311 len = ip_len - off; 1312 else 1313 mhip->ip_off |= IP_MF; 1314 mhip->ip_len = htons((u_short)(len + mhlen)); 1315 m->m_next = m_copy(m0, off, len); 1316 if (m->m_next == 0) { 1317 error = ENOBUFS; /* ??? */ 1318 goto sendorfree; 1319 } 1320 m->m_pkthdr.len = mhlen + len; 1321 m_reset_rcvif(m); 1322 mhip->ip_off = htons((u_short)mhip->ip_off); 1323 mhip->ip_sum = 0; 1324 #ifdef INET 1325 mhip->ip_sum = in_cksum(m, mhlen); 1326 #endif 1327 *mnext = m; 1328 mnext = &m->m_act; 1329 } 1330 /* 1331 * Update first fragment by trimming what's been copied out 1332 * and updating header, then send each fragment (in order). 1333 */ 1334 m_adj(m0, hlen + firstlen - ip_len); 1335 ip->ip_len = htons((u_short)(hlen + firstlen)); 1336 ip->ip_off = htons((u_short)IP_MF); 1337 ip->ip_sum = 0; 1338 #ifdef INET 1339 ip->ip_sum = in_cksum(m0, hlen); 1340 #endif 1341 sendorfree: 1342 for (m = m0; m; m = m0) { 1343 m0 = m->m_act; 1344 m->m_act = 0; 1345 if (error == 0) { 1346 KERNEL_LOCK(1, NULL); 1347 error = (*ifp->if_output)(ifp, m, dst, rt); 1348 KERNEL_UNLOCK_ONE(NULL); 1349 } else { 1350 FREE_MB_T(m); 1351 } 1352 } 1353 } 1354 done: 1355 if (!error) 1356 softc->ipf_frouteok[0]++; 1357 else 1358 softc->ipf_frouteok[1]++; 1359 1360 # if __NetBSD_Version__ >= 499001100 1361 rtcache_unref(rt, ro); 1362 rtcache_free(ro); 1363 # else 1364 if (rt) { 1365 RTFREE(rt); 1366 } 1367 # endif 1368 return error; 1369 bad: 1370 if (error == EMSGSIZE) { 1371 sifp = fin->fin_ifp; 1372 code = fin->fin_icode; 1373 fin->fin_icode = ICMP_UNREACH_NEEDFRAG; 1374 fin->fin_ifp = ifp; 1375 (void) ipf_send_icmp_err(ICMP_UNREACH, fin, 1); 1376 fin->fin_ifp = sifp; 1377 fin->fin_icode = code; 1378 } 1379 FREE_MB_T(m); 1380 goto done; 1381 #endif /* INET */ 1382 } 1383 1384 1385 #if defined(USE_INET6) 1386 /* 1387 * This is the IPv6 specific fastroute code. It doesn't clean up the mbuf's 1388 * or ensure that it is an IPv6 packet that is being forwarded, those are 1389 * expected to be done by the called (ipf_fastroute). 1390 */ 1391 static int 1392 ipf_fastroute6(struct mbuf *m0, struct mbuf **mpp, fr_info_t *fin, 1393 frdest_t *fdp) 1394 { 1395 # if __NetBSD_Version__ >= 499001100 1396 struct route ip6route; 1397 const struct sockaddr *dst; 1398 union { 1399 struct sockaddr dst; 1400 struct sockaddr_in6 dst6; 1401 } u; 1402 struct route *ro; 1403 # else 1404 struct route_in6 ip6route; 1405 struct sockaddr_in6 *dst6; 1406 struct route_in6 *ro; 1407 # endif 1408 struct rtentry *rt; 1409 struct ifnet *ifp; 1410 u_long mtu; 1411 int error; 1412 1413 error = 0; 1414 ro = &ip6route; 1415 1416 if (fdp != NULL) 1417 ifp = fdp->fd_ptr; 1418 else 1419 ifp = fin->fin_ifp; 1420 memset(ro, 0, sizeof(*ro)); 1421 # if __NetBSD_Version__ >= 499001100 1422 if (fdp != NULL && IP6_NOTZERO(&fdp->fd_ip6)) 1423 sockaddr_in6_init(&u.dst6, &fdp->fd_ip6.in6, 0, 0, 0); 1424 else 1425 sockaddr_in6_init(&u.dst6, &fin->fin_fi.fi_dst.in6, 0, 0, 0); 1426 if ((error = in6_setscope(&u.dst6.sin6_addr, ifp, 1427 &u.dst6.sin6_scope_id)) != 0) 1428 return error; 1429 if ((error = sa6_embedscope(&u.dst6, 0)) != 0) 1430 return error; 1431 1432 dst = &u.dst; 1433 rtcache_setdst(ro, dst); 1434 1435 rt = rtcache_init(ro); 1436 if ((ifp == NULL) && (rt != NULL)) 1437 ifp = rt->rt_ifp; 1438 # else 1439 dst6 = (struct sockaddr_in6 *)&ro->ro_dst; 1440 dst6->sin6_family = AF_INET6; 1441 dst6->sin6_len = sizeof(struct sockaddr_in6); 1442 dst6->sin6_addr = fin->fin_fi.fi_dst.in6; 1443 /* KAME */ 1444 if (IN6_IS_ADDR_LINKLOCAL(&dst6->sin6_addr)) 1445 dst6->sin6_addr.s6_addr16[1] = htons(ifp->if_index); 1446 1447 if (fdp != NULL) { 1448 if (IP6_NOTZERO(&fdp->fd_ip6)) 1449 dst6->sin6_addr = fdp->fd_ip6.in6; 1450 } 1451 1452 rtalloc((struct route *)ro); 1453 1454 if ((ifp == NULL) && (ro->ro_rt != NULL)) 1455 ifp = ro->ro_rt->rt_ifp; 1456 rt = ro->ro_rt; 1457 # endif 1458 if ((rt == NULL) || (ifp == NULL)) { 1459 1460 error = EHOSTUNREACH; 1461 goto bad; 1462 } 1463 1464 { 1465 # if (__NetBSD_Version__ >= 106010000) && !defined(IN6_LINKMTU) 1466 struct in6_ifextra *ife; 1467 # endif 1468 if (rt->rt_flags & RTF_GATEWAY) 1469 # if __NetBSD_Version__ >= 499001100 1470 dst = rt->rt_gateway; 1471 # else 1472 dst6 = (struct sockaddr_in6 *)rt->rt_gateway; 1473 # endif 1474 rt->rt_use++; 1475 1476 /* Determine path MTU. */ 1477 # if (__NetBSD_Version__ <= 106009999) 1478 mtu = nd_ifinfo[ifp->if_index].linkmtu; 1479 # else 1480 # ifdef IN6_LINKMTU 1481 mtu = IN6_LINKMTU(ifp); 1482 # else 1483 ife = (struct in6_ifextra *)(ifp)->if_afdata[AF_INET6]; 1484 mtu = ife->nd_ifinfo[ifp->if_index].linkmtu; 1485 # endif 1486 # endif 1487 if ((error == 0) && (m0->m_pkthdr.len <= mtu)) { 1488 # if __NetBSD_Version__ >= 499001100 1489 error = ip6_if_output(ifp, ifp, m0, satocsin6(dst), rt); 1490 # else 1491 error = nd6_output(ifp, ifp, m0, dst6, rt); 1492 # endif 1493 } else { 1494 error = EMSGSIZE; 1495 } 1496 } 1497 bad: 1498 # if __NetBSD_Version__ >= 499001100 1499 rtcache_unref(rt, ro); 1500 rtcache_free(ro); 1501 # else 1502 if (ro->ro_rt != NULL) { 1503 RTFREE(((struct route *)ro)->ro_rt); 1504 } 1505 # endif 1506 return error; 1507 } 1508 #endif /* INET6 */ 1509 1510 1511 int 1512 ipf_verifysrc(fr_info_t *fin) 1513 { 1514 #if __NetBSD_Version__ >= 499001100 1515 union { 1516 struct sockaddr dst; 1517 struct sockaddr_in dst4; 1518 } u; 1519 struct rtentry *rt; 1520 #else 1521 struct sockaddr_in *dst; 1522 #endif 1523 struct route iproute; 1524 int rc; 1525 1526 #if __NetBSD_Version__ >= 499001100 1527 sockaddr_in_init(&u.dst4, &fin->fin_src, 0); 1528 rtcache_setdst(&iproute, &u.dst); 1529 rt = rtcache_init(&iproute); 1530 if (rt == NULL) 1531 rc = 0; 1532 else 1533 rc = (fin->fin_ifp == rt->rt_ifp); 1534 rtcache_unref(rt, &iproute); 1535 rtcache_free(&iproute); 1536 #else 1537 dst = (struct sockaddr_in *)&iproute.ro_dst; 1538 dst->sin_len = sizeof(*dst); 1539 dst->sin_family = AF_INET; 1540 dst->sin_addr = fin->fin_src; 1541 rtalloc(&iproute); 1542 if (iproute.ro_rt == NULL) 1543 return 0; 1544 rc = (fin->fin_ifp == iproute.ro_rt->rt_ifp); 1545 RTFREE(iproute.ro_rt); 1546 #endif 1547 return rc; 1548 } 1549 1550 1551 /* 1552 * return the first IP Address associated with an interface 1553 */ 1554 int 1555 ipf_ifpaddr(ipf_main_softc_t *softc, int v, int atype, void *ifptr, 1556 i6addr_t *inp, i6addr_t *inpmask) 1557 { 1558 #ifdef USE_INET6 1559 struct in6_addr *inp6 = NULL; 1560 #endif 1561 struct sockaddr *sock, *mask; 1562 struct sockaddr_in *sin; 1563 struct ifaddr *ifa; 1564 struct ifnet *ifp; 1565 1566 if ((ifptr == NULL) || (ifptr == (void *)-1)) 1567 return -1; 1568 1569 ifp = ifptr; 1570 mask = NULL; 1571 1572 if (v == 4) 1573 inp->in4.s_addr = 0; 1574 #ifdef USE_INET6 1575 else if (v == 6) 1576 bzero((char *)inp, sizeof(*inp)); 1577 #endif 1578 1579 ifa = IFADDR_READER_FIRST(ifp); 1580 sock = ifa ? ifa->ifa_addr : NULL; 1581 while (sock != NULL && ifa != NULL) { 1582 sin = (struct sockaddr_in *)sock; 1583 if ((v == 4) && (sin->sin_family == AF_INET)) 1584 break; 1585 #ifdef USE_INET6 1586 if ((v == 6) && (sin->sin_family == AF_INET6)) { 1587 inp6 = &((struct sockaddr_in6 *)sin)->sin6_addr; 1588 if (!IN6_IS_ADDR_LINKLOCAL(inp6) && 1589 !IN6_IS_ADDR_LOOPBACK(inp6)) 1590 break; 1591 } 1592 #endif 1593 ifa = IFADDR_READER_NEXT(ifa); 1594 if (ifa != NULL) 1595 sock = ifa->ifa_addr; 1596 } 1597 if (ifa == NULL || sock == NULL) 1598 return -1; 1599 1600 mask = ifa->ifa_netmask; 1601 if (atype == FRI_BROADCAST) 1602 sock = ifa->ifa_broadaddr; 1603 else if (atype == FRI_PEERADDR) 1604 sock = ifa->ifa_dstaddr; 1605 1606 #ifdef USE_INET6 1607 if (v == 6) 1608 return ipf_ifpfillv6addr(atype, (struct sockaddr_in6 *)sock, 1609 (struct sockaddr_in6 *)mask, 1610 inp, inpmask); 1611 #endif 1612 return ipf_ifpfillv4addr(atype, (struct sockaddr_in *)sock, 1613 (struct sockaddr_in *)mask, 1614 &inp->in4, &inpmask->in4); 1615 } 1616 1617 1618 u_32_t 1619 ipf_newisn(fr_info_t *fin) 1620 { 1621 #if __NetBSD_Version__ >= 105190000 /* 1.5T */ 1622 size_t asz; 1623 1624 if (fin->fin_v == 4) 1625 asz = sizeof(struct in_addr); 1626 else if (fin->fin_v == 6) 1627 asz = sizeof(fin->fin_src); 1628 else /* XXX: no way to return error */ 1629 return 0; 1630 #ifdef INET 1631 return tcp_new_iss1((void *)&fin->fin_src, (void *)&fin->fin_dst, 1632 fin->fin_sport, fin->fin_dport, asz, 0); 1633 #else 1634 return ENOSYS; 1635 #endif 1636 #else 1637 static int iss_seq_off = 0; 1638 u_char hash[16]; 1639 u_32_t newiss; 1640 MD5_CTX ctx; 1641 1642 /* 1643 * Compute the base value of the ISS. It is a hash 1644 * of (saddr, sport, daddr, dport, secret). 1645 */ 1646 MD5Init(&ctx); 1647 1648 MD5Update(&ctx, (u_char *) &fin->fin_fi.fi_src, 1649 sizeof(fin->fin_fi.fi_src)); 1650 MD5Update(&ctx, (u_char *) &fin->fin_fi.fi_dst, 1651 sizeof(fin->fin_fi.fi_dst)); 1652 MD5Update(&ctx, (u_char *) &fin->fin_dat, sizeof(fin->fin_dat)); 1653 1654 MD5Update(&ctx, ipf_iss_secret, sizeof(ipf_iss_secret)); 1655 1656 MD5Final(hash, &ctx); 1657 1658 memcpy(&newiss, hash, sizeof(newiss)); 1659 1660 /* 1661 * Now increment our "timer", and add it in to 1662 * the computed value. 1663 * 1664 * XXX Use `addin'? 1665 * XXX TCP_ISSINCR too large to use? 1666 */ 1667 iss_seq_off += 0x00010000; 1668 newiss += iss_seq_off; 1669 return newiss; 1670 #endif 1671 } 1672 1673 1674 /* ------------------------------------------------------------------------ */ 1675 /* Function: ipf_nextipid */ 1676 /* Returns: int - 0 == success, -1 == error (packet should be droppped) */ 1677 /* Parameters: fin(I) - pointer to packet information */ 1678 /* */ 1679 /* Returns the next IPv4 ID to use for this packet. */ 1680 /* ------------------------------------------------------------------------ */ 1681 u_short 1682 ipf_nextipid(fr_info_t *fin) 1683 { 1684 #ifdef USE_MUTEXES 1685 ipf_main_softc_t *softc = fin->fin_main_soft; 1686 #endif 1687 u_short id; 1688 1689 MUTEX_ENTER(&softc->ipf_rw); 1690 id = ipid++; 1691 MUTEX_EXIT(&softc->ipf_rw); 1692 1693 return id; 1694 } 1695 1696 1697 EXTERN_INLINE int 1698 ipf_checkv4sum(fr_info_t *fin) 1699 { 1700 #ifdef M_CSUM_TCP_UDP_BAD 1701 int manual, pflag, cflags, active; 1702 mb_t *m; 1703 1704 if ((fin->fin_flx & FI_NOCKSUM) != 0) 1705 return 0; 1706 1707 if ((fin->fin_flx & FI_SHORT) != 0) 1708 return 1; 1709 1710 if (fin->fin_cksum != FI_CK_NEEDED) 1711 return (fin->fin_cksum > FI_CK_NEEDED) ? 0 : -1; 1712 1713 manual = 0; 1714 m = fin->fin_m; 1715 if (m == NULL) { 1716 manual = 1; 1717 goto skipauto; 1718 } 1719 1720 switch (fin->fin_p) 1721 { 1722 case IPPROTO_UDP : 1723 pflag = M_CSUM_UDPv4; 1724 break; 1725 case IPPROTO_TCP : 1726 pflag = M_CSUM_TCPv4; 1727 break; 1728 default : 1729 pflag = 0; 1730 manual = 1; 1731 break; 1732 } 1733 1734 active = ((struct ifnet *)fin->fin_ifp)->if_csum_flags_rx & pflag; 1735 active |= M_CSUM_TCP_UDP_BAD | M_CSUM_DATA; 1736 cflags = m->m_pkthdr.csum_flags & active; 1737 1738 if (pflag != 0) { 1739 if (cflags == (pflag | M_CSUM_TCP_UDP_BAD)) { 1740 fin->fin_flx |= FI_BAD; 1741 fin->fin_cksum = FI_CK_BAD; 1742 } else if (cflags == (pflag | M_CSUM_DATA)) { 1743 if ((m->m_pkthdr.csum_data ^ 0xffff) != 0) { 1744 fin->fin_flx |= FI_BAD; 1745 fin->fin_cksum = FI_CK_BAD; 1746 } else { 1747 fin->fin_cksum = FI_CK_SUMOK; 1748 } 1749 } else if (cflags == pflag) { 1750 fin->fin_cksum = FI_CK_SUMOK; 1751 } else { 1752 manual = 1; 1753 } 1754 } 1755 skipauto: 1756 if (manual != 0) { 1757 if (ipf_checkl4sum(fin) == -1) { 1758 fin->fin_flx |= FI_BAD; 1759 return -1; 1760 } 1761 } 1762 #else 1763 if (ipf_checkl4sum(fin) == -1) { 1764 fin->fin_flx |= FI_BAD; 1765 return -1; 1766 } 1767 #endif 1768 return 0; 1769 } 1770 1771 1772 #ifdef USE_INET6 1773 EXTERN_INLINE int 1774 ipf_checkv6sum(fr_info_t *fin) 1775 { 1776 # ifdef M_CSUM_TCP_UDP_BAD 1777 int manual, pflag, cflags, active; 1778 mb_t *m; 1779 1780 if ((fin->fin_flx & FI_NOCKSUM) != 0) 1781 return 0; 1782 1783 if ((fin->fin_flx & FI_SHORT) != 0) 1784 return 1; 1785 1786 if (fin->fin_cksum != FI_CK_SUMOK) 1787 return (fin->fin_cksum > FI_CK_NEEDED) ? 0 : -1; 1788 1789 1790 manual = 0; 1791 m = fin->fin_m; 1792 1793 switch (fin->fin_p) 1794 { 1795 case IPPROTO_UDP : 1796 pflag = M_CSUM_UDPv6; 1797 break; 1798 case IPPROTO_TCP : 1799 pflag = M_CSUM_TCPv6; 1800 break; 1801 default : 1802 pflag = 0; 1803 manual = 1; 1804 break; 1805 } 1806 1807 active = ((struct ifnet *)fin->fin_ifp)->if_csum_flags_rx & pflag; 1808 active |= M_CSUM_TCP_UDP_BAD | M_CSUM_DATA; 1809 cflags = m->m_pkthdr.csum_flags & active; 1810 1811 if (pflag != 0) { 1812 if (cflags == (pflag | M_CSUM_TCP_UDP_BAD)) { 1813 fin->fin_flx |= FI_BAD; 1814 } else if (cflags == (pflag | M_CSUM_DATA)) { 1815 if ((m->m_pkthdr.csum_data ^ 0xffff) != 0) 1816 fin->fin_flx |= FI_BAD; 1817 } else if (cflags == pflag) { 1818 ; 1819 } else { 1820 manual = 1; 1821 } 1822 } 1823 if (manual != 0) { 1824 if (ipf_checkl4sum(fin) == -1) { 1825 fin->fin_flx |= FI_BAD; 1826 return -1; 1827 } 1828 } 1829 # else 1830 if (ipf_checkl4sum(fin) == -1) { 1831 fin->fin_flx |= FI_BAD; 1832 return -1; 1833 } 1834 # endif 1835 return 0; 1836 } 1837 #endif /* USE_INET6 */ 1838 1839 1840 size_t 1841 mbufchainlen(struct mbuf *m0) 1842 { 1843 size_t len; 1844 1845 if ((m0->m_flags & M_PKTHDR) != 0) { 1846 len = m0->m_pkthdr.len; 1847 } else { 1848 struct mbuf *m; 1849 1850 for (m = m0, len = 0; m != NULL; m = m->m_next) 1851 len += m->m_len; 1852 } 1853 return len; 1854 } 1855 1856 1857 /* ------------------------------------------------------------------------ */ 1858 /* Function: ipf_pullup */ 1859 /* Returns: NULL == pullup failed, else pointer to protocol header */ 1860 /* Parameters: xmin(I)- pointer to buffer where data packet starts */ 1861 /* fin(I) - pointer to packet information */ 1862 /* len(I) - number of bytes to pullup */ 1863 /* */ 1864 /* Attempt to move at least len bytes (from the start of the buffer) into a */ 1865 /* single buffer for ease of access. Operating system native functions are */ 1866 /* used to manage buffers - if necessary. If the entire packet ends up in */ 1867 /* a single buffer, set the FI_COALESCE flag even though ipf_coalesce() has */ 1868 /* not been called. Both fin_ip and fin_dp are updated before exiting _IF_ */ 1869 /* and ONLY if the pullup succeeds. */ 1870 /* */ 1871 /* We assume that 'xmin' is a pointer to a buffer that is part of the chain */ 1872 /* of buffers that starts at *fin->fin_mp. */ 1873 /* ------------------------------------------------------------------------ */ 1874 void * 1875 ipf_pullup(mb_t *xmin, fr_info_t *fin, int len) 1876 { 1877 int dpoff, ipoff; 1878 mb_t *m = xmin; 1879 char *ip; 1880 1881 if (m == NULL) 1882 return NULL; 1883 1884 ip = (char *)fin->fin_ip; 1885 if ((fin->fin_flx & FI_COALESCE) != 0) 1886 return ip; 1887 1888 ipoff = fin->fin_ipoff; 1889 if (fin->fin_dp != NULL) 1890 dpoff = (char *)fin->fin_dp - (char *)ip; 1891 else 1892 dpoff = 0; 1893 1894 if (M_LEN(m) < len) { 1895 mb_t *n = *fin->fin_mp; 1896 /* 1897 * Assume that M_PKTHDR is set and just work with what is left 1898 * rather than check.. 1899 * Should not make any real difference, anyway. 1900 */ 1901 if (m != n) { 1902 /* 1903 * Record the mbuf that points to the mbuf that we're 1904 * about to go to work on so that we can update the 1905 * m_next appropriately later. 1906 */ 1907 for (; n->m_next != m; n = n->m_next) 1908 ; 1909 } else { 1910 n = NULL; 1911 } 1912 1913 #ifdef MHLEN 1914 if (len > MHLEN) 1915 #else 1916 if (len > MLEN) 1917 #endif 1918 { 1919 #ifdef HAVE_M_PULLDOWN 1920 if (m_pulldown(m, 0, len, NULL) == NULL) 1921 m = NULL; 1922 #else 1923 FREE_MB_T(*fin->fin_mp); 1924 m = NULL; 1925 n = NULL; 1926 #endif 1927 } else 1928 { 1929 m = m_pullup(m, len); 1930 } 1931 if (n != NULL) 1932 n->m_next = m; 1933 if (m == NULL) { 1934 /* 1935 * When n is non-NULL, it indicates that m pointed to 1936 * a sub-chain (tail) of the mbuf and that the head 1937 * of this chain has not yet been free'd. 1938 */ 1939 if (n != NULL) { 1940 FREE_MB_T(*fin->fin_mp); 1941 } 1942 1943 *fin->fin_mp = NULL; 1944 fin->fin_m = NULL; 1945 return NULL; 1946 } 1947 1948 if (n == NULL) 1949 *fin->fin_mp = m; 1950 1951 while (M_LEN(m) == 0) { 1952 m = m->m_next; 1953 } 1954 fin->fin_m = m; 1955 ip = MTOD(m, char *) + ipoff; 1956 1957 fin->fin_ip = (ip_t *)ip; 1958 if (fin->fin_dp != NULL) 1959 fin->fin_dp = (char *)fin->fin_ip + dpoff; 1960 if (fin->fin_fraghdr != NULL) 1961 fin->fin_fraghdr = (char *)ip + 1962 ((char *)fin->fin_fraghdr - 1963 (char *)fin->fin_ip); 1964 } 1965 1966 if (len == fin->fin_plen) 1967 fin->fin_flx |= FI_COALESCE; 1968 return ip; 1969 } 1970 1971 1972 int 1973 ipf_inject(fr_info_t *fin, mb_t *m) 1974 { 1975 int error; 1976 1977 if (fin->fin_out == 0) { 1978 if (__predict_false(!pktq_enqueue(ip_pktq, m, 0))) { 1979 FREE_MB_T(m); 1980 error = ENOBUFS; 1981 } else { 1982 error = 0; 1983 } 1984 } else { 1985 error = ip_output(m, NULL, NULL, IP_FORWARDING, NULL, NULL); 1986 } 1987 return error; 1988 } 1989 1990 1991 u_32_t 1992 ipf_random(void) 1993 { 1994 int number; 1995 1996 #ifdef _CPRNG_H 1997 number = cprng_fast32(); 1998 #else 1999 number = arc4random(); 2000 #endif 2001 return number; 2002 } 2003 2004 2005 /* 2006 * routines below for saving IP headers to buffer 2007 */ 2008 static int ipfopen(dev_t dev, int flags 2009 #if (NetBSD >= 199511) 2010 , int devtype, PROC_T *p 2011 #endif 2012 ) 2013 { 2014 u_int unit = GET_MINOR(dev); 2015 int error; 2016 2017 if (IPL_LOGMAX < unit) { 2018 error = ENXIO; 2019 } else { 2020 switch (unit) 2021 { 2022 case IPL_LOGIPF : 2023 case IPL_LOGNAT : 2024 case IPL_LOGSTATE : 2025 case IPL_LOGAUTH : 2026 case IPL_LOGLOOKUP : 2027 case IPL_LOGSYNC : 2028 #ifdef IPFILTER_SCAN 2029 case IPL_LOGSCAN : 2030 #endif 2031 error = 0; 2032 break; 2033 default : 2034 error = ENXIO; 2035 break; 2036 } 2037 } 2038 #if (__NetBSD_Version__ >= 799003000) 2039 if (error == 0) { 2040 mutex_enter(&ipf_ref_mutex); 2041 ipf_active = 1; 2042 mutex_exit(&ipf_ref_mutex); 2043 } 2044 #endif 2045 return error; 2046 } 2047 2048 2049 static int ipfclose(dev_t dev, int flags 2050 #if (NetBSD >= 199511) 2051 , int devtype, PROC_T *p 2052 #endif 2053 ) 2054 { 2055 u_int unit = GET_MINOR(dev); 2056 2057 if (IPL_LOGMAX < unit) 2058 return ENXIO; 2059 else { 2060 #if (__NetBSD_Version__ >= 799003000) 2061 mutex_enter(&ipf_ref_mutex); 2062 ipf_active = 0; 2063 mutex_exit(&ipf_ref_mutex); 2064 #endif 2065 return 0; 2066 } 2067 } 2068 2069 /* 2070 * ipfread/ipflog 2071 * both of these must operate with at least splnet() lest they be 2072 * called during packet processing and cause an inconsistancy to appear in 2073 * the filter lists. 2074 */ 2075 static int ipfread(dev_t dev, struct uio *uio, int ioflag) 2076 { 2077 2078 if (ipfmain.ipf_running < 1) { 2079 ipfmain.ipf_interror = 130006; 2080 return EIO; 2081 } 2082 2083 if (GET_MINOR(dev) == IPL_LOGSYNC) 2084 return ipf_sync_read(&ipfmain, uio); 2085 2086 #ifdef IPFILTER_LOG 2087 return ipf_log_read(&ipfmain, GET_MINOR(dev), uio); 2088 #else 2089 ipfmain.ipf_interror = 130007; 2090 return ENXIO; 2091 #endif 2092 } 2093 2094 2095 /* 2096 * ipfwrite 2097 * both of these must operate with at least splnet() lest they be 2098 * called during packet processing and cause an inconsistancy to appear in 2099 * the filter lists. 2100 */ 2101 static int ipfwrite(dev_t dev, struct uio *uio, int ioflag) 2102 { 2103 2104 if (ipfmain.ipf_running < 1) { 2105 ipfmain.ipf_interror = 130008; 2106 return EIO; 2107 } 2108 2109 if (GET_MINOR(dev) == IPL_LOGSYNC) 2110 return ipf_sync_write(&ipfmain, uio); 2111 ipfmain.ipf_interror = 130009; 2112 return ENXIO; 2113 } 2114 2115 2116 static int ipfpoll(dev_t dev, int events, PROC_T *p) 2117 { 2118 u_int unit = GET_MINOR(dev); 2119 int revents = 0; 2120 2121 if (IPL_LOGMAX < unit) { 2122 ipfmain.ipf_interror = 130010; 2123 return ENXIO; 2124 } 2125 2126 switch (unit) 2127 { 2128 case IPL_LOGIPF : 2129 case IPL_LOGNAT : 2130 case IPL_LOGSTATE : 2131 #ifdef IPFILTER_LOG 2132 if ((events & (POLLIN | POLLRDNORM)) && 2133 ipf_log_canread(&ipfmain, unit)) 2134 revents |= events & (POLLIN | POLLRDNORM); 2135 #endif 2136 break; 2137 case IPL_LOGAUTH : 2138 if ((events & (POLLIN | POLLRDNORM)) && 2139 ipf_auth_waiting(&ipfmain)) 2140 revents |= events & (POLLIN | POLLRDNORM); 2141 break; 2142 case IPL_LOGSYNC : 2143 if ((events & (POLLIN | POLLRDNORM)) && 2144 ipf_sync_canread(&ipfmain)) 2145 revents |= events & (POLLIN | POLLRDNORM); 2146 if ((events & (POLLOUT | POLLWRNORM)) && 2147 ipf_sync_canwrite(&ipfmain)) 2148 revents |= events & (POLLOUT | POLLWRNORM); 2149 break; 2150 case IPL_LOGSCAN : 2151 case IPL_LOGLOOKUP : 2152 default : 2153 break; 2154 } 2155 2156 if ((revents == 0) && (((events & (POLLIN|POLLRDNORM)) != 0))) 2157 selrecord(p, &ipfmain.ipf_selwait[unit]); 2158 return revents; 2159 } 2160 2161 u_int 2162 ipf_pcksum(fr_info_t *fin, int hlen, u_int sum) 2163 { 2164 struct mbuf *m; 2165 u_int sum2; 2166 int off; 2167 2168 m = fin->fin_m; 2169 off = (char *)fin->fin_dp - (char *)fin->fin_ip; 2170 m->m_data += hlen; 2171 m->m_len -= hlen; 2172 sum2 = in_cksum(fin->fin_m, fin->fin_plen - off); 2173 m->m_len += hlen; 2174 m->m_data -= hlen; 2175 2176 /* 2177 * Both sum and sum2 are partial sums, so combine them together. 2178 */ 2179 sum += ~sum2 & 0xffff; 2180 while (sum > 0xffff) 2181 sum = (sum & 0xffff) + (sum >> 16); 2182 sum2 = ~sum & 0xffff; 2183 return sum2; 2184 } 2185 2186 #if (__NetBSD_Version__ >= 799003000) 2187 2188 /* NetBSD module interface */ 2189 2190 MODULE(MODULE_CLASS_DRIVER, ipl, "bpf_filter"); 2191 2192 static int ipl_init(void *); 2193 static int ipl_fini(void *); 2194 static int ipl_modcmd(modcmd_t, void *); 2195 2196 #ifdef _MODULE 2197 static devmajor_t ipl_cmaj = -1, ipl_bmaj = -1; 2198 #endif 2199 2200 static int 2201 ipl_modcmd(modcmd_t cmd, void *opaque) 2202 { 2203 2204 switch (cmd) { 2205 case MODULE_CMD_INIT: 2206 return ipl_init(opaque); 2207 case MODULE_CMD_FINI: 2208 return ipl_fini(opaque); 2209 default: 2210 return ENOTTY; 2211 } 2212 } 2213 2214 static int 2215 ipl_init(void *opaque) 2216 { 2217 int error; 2218 2219 ipf_listener = kauth_listen_scope(KAUTH_SCOPE_NETWORK, 2220 ipf_listener_cb, NULL); 2221 2222 if ((error = ipf_load_all()) != 0) 2223 return error; 2224 2225 if (ipf_create_all(&ipfmain) == NULL) { 2226 ipf_unload_all(); 2227 return ENODEV; 2228 } 2229 2230 /* Initialize our mutex and reference count */ 2231 mutex_init(&ipf_ref_mutex, MUTEX_DEFAULT, IPL_NONE); 2232 ipf_active = 0; 2233 2234 #ifdef _MODULE 2235 /* 2236 * Insert ourself into the cdevsw list. 2237 */ 2238 error = devsw_attach("ipl", NULL, &ipl_bmaj, &ipl_cdevsw, &ipl_cmaj); 2239 if (error) 2240 ipl_fini(opaque); 2241 #endif 2242 2243 return error; 2244 } 2245 2246 static int 2247 ipl_fini(void *opaque) 2248 { 2249 2250 #ifdef _MODULE 2251 (void)devsw_detach(NULL, &ipl_cdevsw); 2252 #endif 2253 2254 /* 2255 * Grab the mutex, verify that there are no references 2256 * and that there are no running filters. If either 2257 * of these exists, reinsert our cdevsw entry and return 2258 * an error. 2259 */ 2260 mutex_enter(&ipf_ref_mutex); 2261 if (ipf_active != 0 || ipfmain.ipf_running > 0) { 2262 #ifdef _MODULE 2263 (void)devsw_attach("ipl", NULL, &ipl_bmaj, 2264 &ipl_cdevsw, &ipl_cmaj); 2265 #endif 2266 mutex_exit(&ipf_ref_mutex); 2267 return EBUSY; 2268 } 2269 2270 /* Clean up the rest of our state before being unloaded */ 2271 2272 mutex_exit(&ipf_ref_mutex); 2273 mutex_destroy(&ipf_ref_mutex); 2274 ipf_destroy_all(&ipfmain); 2275 ipf_unload_all(); 2276 kauth_unlisten_scope(ipf_listener); 2277 2278 return 0; 2279 } 2280 #endif /* (__NetBSD_Version__ >= 799003000) */ 2281
Indexes created Fri Sep 26 20:09:58 GMT 2025