ip_fil_netbsd.c revision 1.22.4.4
1 /* $NetBSD: ip_fil_netbsd.c,v 1.22.4.4 2017/04/29 11:12:15 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 1.22.4.4 2017/04/29 11:12:15 pgoyette Exp $"); 12 #else 13 static const char sccsid[] = "@(#)ip_fil.c 2.41 6/5/96 (C) 1993-2000 Darren Reed"; 14 static const char rcsid[] = "@(#)Id: ip_fil_netbsd.c,v 1.1.1.2 2012/07/22 13:45:17 darrenr Exp"; 15 #endif 16 #endif 17 18 #if defined(KERNEL) || defined(_KERNEL) 19 # undef KERNEL 20 # undef _KERNEL 21 # define KERNEL 1 22 # define _KERNEL 1 23 #endif 24 #include <sys/param.h> 25 #if (NetBSD >= 199905) && !defined(IPFILTER_LKM) 26 # if (__NetBSD_Version__ >= 799003000) 27 # ifdef _KERNEL_OPT 28 # include "opt_ipsec.h" 29 # endif 30 # else 31 # include "opt_ipsec.h" 32 # endif 33 #endif 34 #include <sys/errno.h> 35 #include <sys/types.h> 36 #include <sys/file.h> 37 #include <sys/ioctl.h> 38 #include <sys/time.h> 39 #include <sys/systm.h> 40 #include <sys/select.h> 41 #if (NetBSD > 199609) 42 # include <sys/dirent.h> 43 #else 44 # include <sys/dir.h> 45 #endif 46 #if (__NetBSD_Version__ >= 599005900) 47 # include <sys/cprng.h> 48 #endif 49 #include <sys/mbuf.h> 50 #include <sys/protosw.h> 51 #include <sys/socket.h> 52 #include <sys/poll.h> 53 #if (__NetBSD_Version__ >= 399002000) 54 # include <sys/kauth.h> 55 #endif 56 #if (__NetBSD_Version__ >= 799003000) 57 #include <sys/module.h> 58 #include <sys/mutex.h> 59 #endif 60 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 #endif 83 #include "netinet/ip_fil.h" 84 #include "netinet/ip_nat.h" 85 #include "netinet/ip_frag.h" 86 #include "netinet/ip_state.h" 87 #include "netinet/ip_proxy.h" 88 #include "netinet/ip_auth.h" 89 #include "netinet/ip_sync.h" 90 #include "netinet/ip_lookup.h" 91 #include "netinet/ip_dstlist.h" 92 #ifdef IPFILTER_SCAN 93 #include "netinet/ip_scan.h" 94 #endif 95 #include <sys/md5.h> 96 #include <sys/kernel.h> 97 #include <sys/conf.h> 98 #ifdef INET 99 extern int ip_optcopy (struct ip *, struct ip *); 100 #endif 101 102 #ifdef IPFILTER_M_IPFILTER 103 MALLOC_DEFINE(M_IPFILTER, "IP Filter", "IP Filter packet filter data structures"); 104 #endif 105 106 #if __NetBSD_Version__ >= 105009999 107 # define csuminfo csum_flags 108 #endif 109 110 #if __NetBSD_Version__ < 200000000 111 extern struct protosw inetsw[]; 112 #endif 113 114 #if (__NetBSD_Version__ >= 599002000) 115 static kauth_listener_t ipf_listener; 116 #endif 117 118 #if (__NetBSD_Version__ < 399001400) 119 extern int ip6_getpmtu (struct route_in6 *, struct route_in6 *, 120 struct ifnet *, struct in6_addr *, u_long *, 121 int *); 122 #endif 123 #if (NetBSD >= 199511) 124 static int ipfopen(dev_t dev, int flags, int devtype, PROC_T *p); 125 static int ipfclose(dev_t dev, int flags, int devtype, PROC_T *p); 126 #else 127 # if (__NetBSD_Version__ >= 399001400) 128 static int ipfopen(dev_t dev, int flags, struct lwp *); 129 static int ipfclose(dev_t dev, int flags, struct lwp *); 130 # else 131 static int ipfopen(dev_t dev, int flags); 132 static int ipfclose(dev_t dev, int flags); 133 # endif /* __NetBSD_Version__ >= 399001400 */ 134 #endif 135 static int ipfread(dev_t, struct uio *, int ioflag); 136 static int ipfwrite(dev_t, struct uio *, int ioflag); 137 static int ipfpoll(dev_t, int events, PROC_T *); 138 static void ipf_timer_func(void *ptr); 139 140 const struct cdevsw ipl_cdevsw = { 141 #if (__NetBSD_Version__ >= 799007100) 142 DEVSW_MODULE_INIT 143 #endif 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 (void) pfil_remove_hook((void *)ipf_pfilsync, NULL, 589 PFIL_IFNET, ph_ifsync); 590 # endif 591 592 if (ph_inet != NULL) 593 error = pfil_remove_hook((void *)ipf_check_wrapper, NULL, 594 PFIL_IN|PFIL_OUT, ph_inet); 595 else 596 error = 0; 597 # else 598 error = pfil_remove_hook((void *)ipf_check, PFIL_IN|PFIL_OUT, 599 &inetsw[ip_protox[IPPROTO_IP]].pr_pfh); 600 # endif 601 if (error) { 602 SPL_X(s); 603 IPFERROR(130011); 604 return error; 605 } 606 # else 607 pfil_remove_hook((void *)ipf_check, PFIL_IN|PFIL_OUT); 608 # endif 609 # ifdef USE_INET6 610 # if __NetBSD_Version__ >= 105110000 611 if (ph_inet6 != NULL) 612 error = pfil_remove_hook((void *)ipf_check_wrapper6, NULL, 613 PFIL_IN|PFIL_OUT, ph_inet6); 614 else 615 error = 0; 616 # else 617 error = pfil_remove_hook((void *)ipf_check, PFIL_IN|PFIL_OUT, 618 &inetsw[ip_protox[IPPROTO_IPV6]].pr_pfh); 619 # endif 620 if (error) { 621 SPL_X(s); 622 IPFERROR(130012); 623 return error; 624 } 625 # endif 626 #endif 627 SPL_X(s); 628 629 #if (__NetBSD_Version__ >= 499005500) 630 for (i = 0; i < IPL_LOGSIZE; i++) 631 seldestroy(&ipfmain.ipf_selwait[i]); 632 #endif 633 634 ipf_fini_all(softc); 635 636 return 0; 637 } 638 639 640 /* 641 * Filter ioctl interface. 642 */ 643 int 644 ipfioctl(dev_t dev, u_long cmd, 645 #if (__NetBSD_Version__ >= 499001000) 646 void *data, 647 #else 648 caddr_t data, 649 #endif 650 int mode 651 #if (NetBSD >= 199511) 652 # if (__NetBSD_Version__ >= 399001400) 653 , struct lwp *p 654 # if (__NetBSD_Version__ >= 399002000) 655 # define UID(l) kauth_cred_getuid((l)->l_cred) 656 # else 657 # define UID(l) ((l)->l_proc->p_cred->p_ruid) 658 # endif 659 # else 660 , struct proc *p 661 # define UID(p) ((p)->p_cred->p_ruid) 662 # endif 663 #endif 664 ) 665 { 666 int error = 0, unit = 0; 667 SPL_INT(s); 668 669 #if (__NetBSD_Version__ >= 399002000) 670 if ((mode & FWRITE) && 671 kauth_authorize_network(p->l_cred, KAUTH_NETWORK_FIREWALL, 672 KAUTH_REQ_NETWORK_FIREWALL_FW, NULL, 673 NULL, NULL)) { 674 ipfmain.ipf_interror = 130005; 675 return EPERM; 676 } 677 #else 678 if ((securelevel >= 2) && (mode & FWRITE)) { 679 ipfmain.ipf_interror = 130001; 680 return EPERM; 681 } 682 #endif 683 684 unit = GET_MINOR(dev); 685 if ((IPL_LOGMAX < unit) || (unit < 0)) { 686 ipfmain.ipf_interror = 130002; 687 return ENXIO; 688 } 689 690 if (ipfmain.ipf_running <= 0) { 691 if (unit != IPL_LOGIPF && cmd != SIOCIPFINTERROR) { 692 ipfmain.ipf_interror = 130003; 693 return EIO; 694 } 695 if (cmd != SIOCIPFGETNEXT && cmd != SIOCIPFGET && 696 cmd != SIOCIPFSET && cmd != SIOCFRENB && 697 cmd != SIOCGETFS && cmd != SIOCGETFF && 698 cmd != SIOCIPFINTERROR) { 699 ipfmain.ipf_interror = 130004; 700 return EIO; 701 } 702 } 703 704 SPL_NET(s); 705 706 error = ipf_ioctlswitch(&ipfmain, unit, data, cmd, mode, UID(p), p); 707 if (error != -1) { 708 SPL_X(s); 709 return error; 710 } 711 712 SPL_X(s); 713 return error; 714 } 715 716 717 /* 718 * ipf_send_reset - this could conceivably be a call to tcp_respond(), but that 719 * requires a large amount of setting up and isn't any more efficient. 720 */ 721 int 722 ipf_send_reset(fr_info_t *fin) 723 { 724 struct tcphdr *tcp, *tcp2; 725 int tlen = 0, hlen; 726 struct mbuf *m; 727 #ifdef USE_INET6 728 ip6_t *ip6; 729 #endif 730 ip_t *ip; 731 732 tcp = fin->fin_dp; 733 if (tcp->th_flags & TH_RST) 734 return -1; /* feedback loop */ 735 736 if (ipf_checkl4sum(fin) == -1) 737 return -1; 738 739 tlen = fin->fin_dlen - (TCP_OFF(tcp) << 2) + 740 ((tcp->th_flags & TH_SYN) ? 1 : 0) + 741 ((tcp->th_flags & TH_FIN) ? 1 : 0); 742 743 #ifdef USE_INET6 744 hlen = (fin->fin_v == 6) ? sizeof(ip6_t) : sizeof(ip_t); 745 #else 746 hlen = sizeof(ip_t); 747 #endif 748 #ifdef MGETHDR 749 MGETHDR(m, M_DONTWAIT, MT_HEADER); 750 #else 751 MGET(m, M_DONTWAIT, MT_HEADER); 752 #endif 753 if (m == NULL) 754 return -1; 755 if (sizeof(*tcp2) + hlen > MHLEN) { 756 MCLGET(m, M_DONTWAIT); 757 if (m == NULL) 758 return -1; 759 if ((m->m_flags & M_EXT) == 0) { 760 FREE_MB_T(m); 761 return -1; 762 } 763 } 764 765 m->m_len = sizeof(*tcp2) + hlen; 766 m->m_data += max_linkhdr; 767 m->m_pkthdr.len = m->m_len; 768 m_reset_rcvif(m); 769 ip = mtod(m, struct ip *); 770 bzero((char *)ip, hlen); 771 #ifdef USE_INET6 772 ip6 = (ip6_t *)ip; 773 #endif 774 bzero((char *)ip, sizeof(*tcp2) + hlen); 775 tcp2 = (struct tcphdr *)((char *)ip + hlen); 776 tcp2->th_sport = tcp->th_dport; 777 tcp2->th_dport = tcp->th_sport; 778 779 if (tcp->th_flags & TH_ACK) { 780 tcp2->th_seq = tcp->th_ack; 781 tcp2->th_flags = TH_RST; 782 tcp2->th_ack = 0; 783 } else { 784 tcp2->th_seq = 0; 785 tcp2->th_ack = ntohl(tcp->th_seq); 786 tcp2->th_ack += tlen; 787 tcp2->th_ack = htonl(tcp2->th_ack); 788 tcp2->th_flags = TH_RST|TH_ACK; 789 } 790 tcp2->th_x2 = 0; 791 TCP_OFF_A(tcp2, sizeof(*tcp2) >> 2); 792 tcp2->th_win = tcp->th_win; 793 tcp2->th_sum = 0; 794 tcp2->th_urp = 0; 795 796 #ifdef USE_INET6 797 if (fin->fin_v == 6) { 798 ip6->ip6_flow = ((ip6_t *)fin->fin_ip)->ip6_flow; 799 ip6->ip6_plen = htons(sizeof(struct tcphdr)); 800 ip6->ip6_nxt = IPPROTO_TCP; 801 ip6->ip6_hlim = 0; 802 ip6->ip6_src = fin->fin_dst6.in6; 803 ip6->ip6_dst = fin->fin_src6.in6; 804 tcp2->th_sum = in6_cksum(m, IPPROTO_TCP, 805 sizeof(*ip6), sizeof(*tcp2)); 806 return ipf_send_ip(fin, m); 807 } 808 #endif 809 #ifdef INET 810 ip->ip_p = IPPROTO_TCP; 811 ip->ip_len = htons(sizeof(struct tcphdr)); 812 ip->ip_src.s_addr = fin->fin_daddr; 813 ip->ip_dst.s_addr = fin->fin_saddr; 814 tcp2->th_sum = in_cksum(m, hlen + sizeof(*tcp2)); 815 ip->ip_len = hlen + sizeof(*tcp2); 816 return ipf_send_ip(fin, m); 817 #else 818 return 0; 819 #endif 820 } 821 822 823 /* 824 * Expects ip_len to be in host byte order when called. 825 */ 826 static int 827 ipf_send_ip(fr_info_t *fin, mb_t *m) 828 { 829 fr_info_t fnew; 830 #ifdef INET 831 ip_t *oip; 832 #endif 833 ip_t *ip; 834 int hlen; 835 836 ip = mtod(m, ip_t *); 837 bzero((char *)&fnew, sizeof(fnew)); 838 fnew.fin_main_soft = fin->fin_main_soft; 839 840 IP_V_A(ip, fin->fin_v); 841 switch (fin->fin_v) 842 { 843 #ifdef INET 844 case 4 : 845 oip = fin->fin_ip; 846 hlen = sizeof(*oip); 847 fnew.fin_v = 4; 848 fnew.fin_p = ip->ip_p; 849 fnew.fin_plen = ntohs(ip->ip_len); 850 HTONS(ip->ip_len); 851 IP_HL_A(ip, sizeof(*oip) >> 2); 852 ip->ip_tos = oip->ip_tos; 853 ip->ip_id = ipf_nextipid(fin); 854 ip->ip_off = htons(ip_mtudisc ? IP_DF : 0); 855 ip->ip_ttl = ip_defttl; 856 ip->ip_sum = 0; 857 break; 858 #endif 859 #ifdef USE_INET6 860 case 6 : 861 { 862 ip6_t *ip6 = (ip6_t *)ip; 863 864 ip6->ip6_vfc = 0x60; 865 ip6->ip6_hlim = IPDEFTTL; 866 867 hlen = sizeof(*ip6); 868 fnew.fin_p = ip6->ip6_nxt; 869 fnew.fin_v = 6; 870 fnew.fin_plen = ntohs(ip6->ip6_plen) + hlen; 871 break; 872 } 873 #endif 874 default : 875 return EINVAL; 876 } 877 #ifdef KAME_IPSEC 878 m_reset_rcvif(m); 879 #endif 880 881 fnew.fin_ifp = fin->fin_ifp; 882 fnew.fin_flx = FI_NOCKSUM; 883 fnew.fin_m = m; 884 fnew.fin_ip = ip; 885 fnew.fin_mp = &m; 886 fnew.fin_hlen = hlen; 887 fnew.fin_dp = (char *)ip + hlen; 888 (void) ipf_makefrip(hlen, ip, &fnew); 889 890 return ipf_fastroute(m, &m, &fnew, NULL); 891 } 892 893 894 int 895 ipf_send_icmp_err(int type, fr_info_t *fin, int dst) 896 { 897 int err, hlen, xtra, iclen, ohlen, avail; 898 struct in_addr dst4; 899 struct icmp *icmp; 900 struct mbuf *m; 901 i6addr_t dst6; 902 void *ifp; 903 #ifdef USE_INET6 904 int code; 905 ip6_t *ip6; 906 #endif 907 ip_t *ip, *ip2; 908 909 if ((type < 0) || (type > ICMP_MAXTYPE)) 910 return -1; 911 912 #ifdef USE_INET6 913 code = fin->fin_icode; 914 if ((code < 0) || (code >= sizeof(icmptoicmp6unreach)/sizeof(int))) 915 return -1; 916 #endif 917 918 if (ipf_checkl4sum(fin) == -1) 919 return -1; 920 #ifdef MGETHDR 921 MGETHDR(m, M_DONTWAIT, MT_HEADER); 922 #else 923 MGET(m, M_DONTWAIT, MT_HEADER); 924 #endif 925 if (m == NULL) 926 return -1; 927 avail = MHLEN; 928 929 xtra = 0; 930 hlen = 0; 931 ohlen = 0; 932 dst4.s_addr = 0; 933 ifp = fin->fin_ifp; 934 if (fin->fin_v == 4) { 935 if ((fin->fin_p == IPPROTO_ICMP) && !(fin->fin_flx & FI_SHORT)) 936 switch (ntohs(fin->fin_data[0]) >> 8) 937 { 938 case ICMP_ECHO : 939 case ICMP_TSTAMP : 940 case ICMP_IREQ : 941 case ICMP_MASKREQ : 942 break; 943 default : 944 FREE_MB_T(m); 945 return 0; 946 } 947 948 if (dst == 0) { 949 if (ipf_ifpaddr(&ipfmain, 4, FRI_NORMAL, ifp, 950 &dst6, NULL) == -1) { 951 FREE_MB_T(m); 952 return -1; 953 } 954 dst4 = dst6.in4; 955 } else 956 dst4.s_addr = fin->fin_daddr; 957 958 hlen = sizeof(ip_t); 959 ohlen = fin->fin_hlen; 960 iclen = hlen + offsetof(struct icmp, icmp_ip) + ohlen; 961 if (fin->fin_hlen < fin->fin_plen) 962 xtra = MIN(fin->fin_dlen, 8); 963 else 964 xtra = 0; 965 } 966 967 #ifdef USE_INET6 968 else if (fin->fin_v == 6) { 969 hlen = sizeof(ip6_t); 970 ohlen = sizeof(ip6_t); 971 iclen = hlen + offsetof(struct icmp, icmp_ip) + ohlen; 972 type = icmptoicmp6types[type]; 973 if (type == ICMP6_DST_UNREACH) 974 code = icmptoicmp6unreach[code]; 975 976 if (iclen + max_linkhdr + fin->fin_plen > avail) { 977 MCLGET(m, M_DONTWAIT); 978 if (m == NULL) 979 return -1; 980 if ((m->m_flags & M_EXT) == 0) { 981 FREE_MB_T(m); 982 return -1; 983 } 984 avail = MCLBYTES; 985 } 986 xtra = MIN(fin->fin_plen, avail - iclen - max_linkhdr); 987 xtra = MIN(xtra, IPV6_MMTU - iclen); 988 if (dst == 0) { 989 if (ipf_ifpaddr(&ipfmain, 6, FRI_NORMAL, ifp, 990 &dst6, NULL) == -1) { 991 FREE_MB_T(m); 992 return -1; 993 } 994 } else 995 dst6 = fin->fin_dst6; 996 } 997 #endif 998 else { 999 FREE_MB_T(m); 1000 return -1; 1001 } 1002 1003 avail -= (max_linkhdr + iclen); 1004 if (avail < 0) { 1005 FREE_MB_T(m); 1006 return -1; 1007 } 1008 if (xtra > avail) 1009 xtra = avail; 1010 iclen += xtra; 1011 m->m_data += max_linkhdr; 1012 m_reset_rcvif(m); 1013 m->m_pkthdr.len = iclen; 1014 m->m_len = iclen; 1015 ip = mtod(m, ip_t *); 1016 icmp = (struct icmp *)((char *)ip + hlen); 1017 ip2 = (ip_t *)&icmp->icmp_ip; 1018 1019 icmp->icmp_type = type; 1020 icmp->icmp_code = fin->fin_icode; 1021 icmp->icmp_cksum = 0; 1022 #ifdef icmp_nextmtu 1023 if (type == ICMP_UNREACH && fin->fin_icode == ICMP_UNREACH_NEEDFRAG) { 1024 if (fin->fin_mtu != 0) { 1025 icmp->icmp_nextmtu = htons(fin->fin_mtu); 1026 1027 } else if (ifp != NULL) { 1028 icmp->icmp_nextmtu = htons(GETIFMTU_4(ifp)); 1029 1030 } else { /* make up a number... */ 1031 icmp->icmp_nextmtu = htons(fin->fin_plen - 20); 1032 } 1033 } 1034 #endif 1035 1036 bcopy((char *)fin->fin_ip, (char *)ip2, ohlen); 1037 1038 #if defined(M_CSUM_IPv4) 1039 /* 1040 * Clear any in-bound checksum flags for this packet. 1041 */ 1042 m->m_pkthdr.csuminfo = 0; 1043 #endif /* __NetBSD__ && M_CSUM_IPv4 */ 1044 1045 #ifdef USE_INET6 1046 ip6 = (ip6_t *)ip; 1047 if (fin->fin_v == 6) { 1048 ip6->ip6_flow = ((ip6_t *)fin->fin_ip)->ip6_flow; 1049 ip6->ip6_plen = htons(iclen - hlen); 1050 ip6->ip6_nxt = IPPROTO_ICMPV6; 1051 ip6->ip6_hlim = 0; 1052 ip6->ip6_src = dst6.in6; 1053 ip6->ip6_dst = fin->fin_src6.in6; 1054 if (xtra > 0) 1055 bcopy((char *)fin->fin_ip + ohlen, 1056 (char *)&icmp->icmp_ip + ohlen, xtra); 1057 icmp->icmp_cksum = in6_cksum(m, IPPROTO_ICMPV6, 1058 sizeof(*ip6), iclen - hlen); 1059 } else 1060 #endif 1061 { 1062 ip->ip_p = IPPROTO_ICMP; 1063 ip->ip_src.s_addr = dst4.s_addr; 1064 ip->ip_dst.s_addr = fin->fin_saddr; 1065 1066 if (xtra > 0) 1067 bcopy((char *)fin->fin_ip + ohlen, 1068 (char *)&icmp->icmp_ip + ohlen, xtra); 1069 icmp->icmp_cksum = ipf_cksum((u_short *)icmp, 1070 sizeof(*icmp) + 8); 1071 ip->ip_len = iclen; 1072 ip->ip_p = IPPROTO_ICMP; 1073 } 1074 err = ipf_send_ip(fin, m); 1075 return err; 1076 } 1077 1078 1079 /* 1080 * m0 - pointer to mbuf where the IP packet starts 1081 * mpp - pointer to the mbuf pointer that is the start of the mbuf chain 1082 */ 1083 int 1084 ipf_fastroute(mb_t *m0, mb_t **mpp, fr_info_t *fin, frdest_t *fdp) 1085 { 1086 register struct ip *ip, *mhip; 1087 register struct mbuf *m = *mpp; 1088 register struct route *ro; 1089 int len, off, error = 0, hlen, code; 1090 struct ifnet *ifp, *sifp; 1091 ipf_main_softc_t *softc; 1092 #if __NetBSD_Version__ >= 499001100 1093 union { 1094 struct sockaddr dst; 1095 struct sockaddr_in dst4; 1096 } u; 1097 #else 1098 struct sockaddr_in *dst4; 1099 #endif 1100 struct sockaddr *dst; 1101 u_short ip_off, ip_len; 1102 struct route iproute; 1103 struct rtentry *rt; 1104 frdest_t node; 1105 frentry_t *fr; 1106 1107 if (fin->fin_v == 6) { 1108 #ifdef USE_INET6 1109 error = ipf_fastroute6(m0, mpp, fin, fdp); 1110 #else 1111 error = EPROTONOSUPPORT; 1112 #endif 1113 if ((error != 0) && (*mpp != NULL)) 1114 FREE_MB_T(*mpp); 1115 return error; 1116 } 1117 #ifndef INET 1118 FREE_MB_T(*mpp); 1119 return EPROTONOSUPPORT; 1120 #else 1121 1122 hlen = fin->fin_hlen; 1123 ip = mtod(m0, struct ip *); 1124 softc = fin->fin_main_soft; 1125 rt = NULL; 1126 ifp = NULL; 1127 1128 # if defined(M_CSUM_IPv4) 1129 /* 1130 * Clear any in-bound checksum flags for this packet. 1131 */ 1132 m0->m_pkthdr.csuminfo = 0; 1133 # endif /* __NetBSD__ && M_CSUM_IPv4 */ 1134 1135 /* 1136 * Route packet. 1137 */ 1138 ro = &iproute; 1139 memset(ro, 0, sizeof(*ro)); 1140 fr = fin->fin_fr; 1141 1142 if ((fr != NULL) && !(fr->fr_flags & FR_KEEPSTATE) && (fdp != NULL) && 1143 (fdp->fd_type == FRD_DSTLIST)) { 1144 if (ipf_dstlist_select_node(fin, fdp->fd_ptr, NULL, &node) == 0) 1145 fdp = &node; 1146 } 1147 if (fdp != NULL) 1148 ifp = fdp->fd_ptr; 1149 else 1150 ifp = fin->fin_ifp; 1151 1152 if ((ifp == NULL) && ((fr == NULL) || !(fr->fr_flags & FR_FASTROUTE))) { 1153 error = -2; 1154 goto bad; 1155 } 1156 1157 # if __NetBSD_Version__ >= 499001100 1158 if ((fdp != NULL) && (fdp->fd_ip.s_addr != 0)) 1159 sockaddr_in_init(&u.dst4, &fdp->fd_ip, 0); 1160 else 1161 sockaddr_in_init(&u.dst4, &ip->ip_dst, 0); 1162 dst = &u.dst; 1163 rtcache_setdst(ro, dst); 1164 rt = rtcache_init(ro); 1165 # else 1166 dst4 = (struct sockaddr_in *)&ro->ro_dst; 1167 dst = (struct sockaddr *)dst4; 1168 dst4->sin_family = AF_INET; 1169 dst4->sin_addr = ip->ip_dst; 1170 1171 if ((fdp != NULL) && (fdp->fd_ip.s_addr != 0)) 1172 dst4->sin_addr = fdp->fd_ip; 1173 1174 dst4->sin_len = sizeof(*dst); 1175 rtalloc(ro); 1176 rt = ro->ro_rt; 1177 # endif 1178 if ((ifp == NULL) && (rt != NULL)) 1179 ifp = rt->rt_ifp; 1180 if ((rt == NULL) || (ifp == NULL)) { 1181 #ifdef INET 1182 if (in_localaddr(ip->ip_dst)) 1183 error = EHOSTUNREACH; 1184 else 1185 #endif 1186 error = ENETUNREACH; 1187 goto bad; 1188 } 1189 1190 1191 if (rt->rt_flags & RTF_GATEWAY) 1192 dst = rt->rt_gateway; 1193 1194 rt->rt_use++; 1195 1196 /* 1197 * For input packets which are being "fastrouted", they won't 1198 * go back through output filtering and miss their chance to get 1199 * NAT'd and counted. Duplicated packets aren't considered to be 1200 * part of the normal packet stream, so do not NAT them or pass 1201 * them through stateful checking, etc. 1202 */ 1203 if ((fdp != &fr->fr_dif) && (fin->fin_out == 0)) { 1204 sifp = fin->fin_ifp; 1205 fin->fin_ifp = ifp; 1206 fin->fin_out = 1; 1207 (void) ipf_acctpkt(fin, NULL); 1208 fin->fin_fr = NULL; 1209 if (!fr || !(fr->fr_flags & FR_RETMASK)) { 1210 u_32_t pass; 1211 1212 (void) ipf_state_check(fin, &pass); 1213 } 1214 1215 switch (ipf_nat_checkout(fin, NULL)) 1216 { 1217 case 0 : 1218 break; 1219 case 1 : 1220 ip->ip_sum = 0; 1221 break; 1222 case -1 : 1223 error = -1; 1224 goto bad; 1225 break; 1226 } 1227 1228 fin->fin_ifp = sifp; 1229 fin->fin_out = 0; 1230 } else 1231 ip->ip_sum = 0; 1232 /* 1233 * If small enough for interface, can just send directly. 1234 */ 1235 m_set_rcvif(m, ifp); 1236 1237 ip_len = ntohs(ip->ip_len); 1238 if (ip_len <= ifp->if_mtu) { 1239 # if defined(M_CSUM_IPv4) 1240 # if (__NetBSD_Version__ >= 105009999) 1241 if (ifp->if_csum_flags_tx & M_CSUM_IPv4) 1242 m->m_pkthdr.csuminfo |= M_CSUM_IPv4; 1243 # else 1244 if (ifp->if_capabilities & IFCAP_CSUM_IPv4) 1245 m->m_pkthdr.csuminfo |= M_CSUM_IPv4; 1246 # endif /* (__NetBSD_Version__ >= 105009999) */ 1247 else if (ip->ip_sum == 0) 1248 ip->ip_sum = in_cksum(m, hlen); 1249 # else 1250 if (!ip->ip_sum) 1251 ip->ip_sum = in_cksum(m, hlen); 1252 # endif /* M_CSUM_IPv4 */ 1253 1254 error = if_output_lock(ifp, ifp, m, dst, rt); 1255 goto done; 1256 } 1257 1258 /* 1259 * Too large for interface; fragment if possible. 1260 * Must be able to put at least 8 bytes per fragment. 1261 */ 1262 ip_off = ntohs(ip->ip_off); 1263 if (ip_off & IP_DF) { 1264 error = EMSGSIZE; 1265 goto bad; 1266 } 1267 len = (ifp->if_mtu - hlen) &~ 7; 1268 if (len < 8) { 1269 error = EMSGSIZE; 1270 goto bad; 1271 } 1272 1273 { 1274 int mhlen, firstlen = len; 1275 struct mbuf **mnext = &m->m_act; 1276 1277 /* 1278 * Loop through length of segment after first fragment, 1279 * make new header and copy data of each part and link onto chain. 1280 */ 1281 m0 = m; 1282 mhlen = sizeof (struct ip); 1283 for (off = hlen + len; off < ip_len; off += len) { 1284 # ifdef MGETHDR 1285 MGETHDR(m, M_DONTWAIT, MT_HEADER); 1286 # else 1287 MGET(m, M_DONTWAIT, MT_HEADER); 1288 # endif 1289 if (m == 0) { 1290 m = m0; 1291 error = ENOBUFS; 1292 goto bad; 1293 } 1294 m->m_data += max_linkhdr; 1295 mhip = mtod(m, struct ip *); 1296 bcopy((char *)ip, (char *)mhip, sizeof(*ip)); 1297 #ifdef INET 1298 if (hlen > sizeof (struct ip)) { 1299 mhlen = ip_optcopy(ip, mhip) + sizeof (struct ip); 1300 IP_HL_A(mhip, mhlen >> 2); 1301 } 1302 #endif 1303 m->m_len = mhlen; 1304 mhip->ip_off = ((off - hlen) >> 3) + ip_off; 1305 if (off + len >= ip_len) 1306 len = ip_len - off; 1307 else 1308 mhip->ip_off |= IP_MF; 1309 mhip->ip_len = htons((u_short)(len + mhlen)); 1310 m->m_next = m_copy(m0, off, len); 1311 if (m->m_next == 0) { 1312 error = ENOBUFS; /* ??? */ 1313 goto sendorfree; 1314 } 1315 m->m_pkthdr.len = mhlen + len; 1316 m_reset_rcvif(m); 1317 mhip->ip_off = htons((u_short)mhip->ip_off); 1318 mhip->ip_sum = 0; 1319 #ifdef INET 1320 mhip->ip_sum = in_cksum(m, mhlen); 1321 #endif 1322 *mnext = m; 1323 mnext = &m->m_act; 1324 } 1325 /* 1326 * Update first fragment by trimming what's been copied out 1327 * and updating header, then send each fragment (in order). 1328 */ 1329 m_adj(m0, hlen + firstlen - ip_len); 1330 ip->ip_len = htons((u_short)(hlen + firstlen)); 1331 ip->ip_off = htons((u_short)IP_MF); 1332 ip->ip_sum = 0; 1333 #ifdef INET 1334 ip->ip_sum = in_cksum(m0, hlen); 1335 #endif 1336 sendorfree: 1337 for (m = m0; m; m = m0) { 1338 m0 = m->m_act; 1339 m->m_act = 0; 1340 if (error == 0) { 1341 KERNEL_LOCK(1, NULL); 1342 error = (*ifp->if_output)(ifp, m, dst, rt); 1343 KERNEL_UNLOCK_ONE(NULL); 1344 } else { 1345 FREE_MB_T(m); 1346 } 1347 } 1348 } 1349 done: 1350 if (!error) 1351 softc->ipf_frouteok[0]++; 1352 else 1353 softc->ipf_frouteok[1]++; 1354 1355 # if __NetBSD_Version__ >= 499001100 1356 rtcache_unref(rt, ro); 1357 rtcache_free(ro); 1358 # else 1359 if (rt) { 1360 RTFREE(rt); 1361 } 1362 # endif 1363 return error; 1364 bad: 1365 if (error == EMSGSIZE) { 1366 sifp = fin->fin_ifp; 1367 code = fin->fin_icode; 1368 fin->fin_icode = ICMP_UNREACH_NEEDFRAG; 1369 fin->fin_ifp = ifp; 1370 (void) ipf_send_icmp_err(ICMP_UNREACH, fin, 1); 1371 fin->fin_ifp = sifp; 1372 fin->fin_icode = code; 1373 } 1374 FREE_MB_T(m); 1375 goto done; 1376 #endif /* INET */ 1377 } 1378 1379 1380 #if defined(USE_INET6) 1381 /* 1382 * This is the IPv6 specific fastroute code. It doesn't clean up the mbuf's 1383 * or ensure that it is an IPv6 packet that is being forwarded, those are 1384 * expected to be done by the called (ipf_fastroute). 1385 */ 1386 static int 1387 ipf_fastroute6(struct mbuf *m0, struct mbuf **mpp, fr_info_t *fin, 1388 frdest_t *fdp) 1389 { 1390 # if __NetBSD_Version__ >= 499001100 1391 struct route ip6route; 1392 const struct sockaddr *dst; 1393 union { 1394 struct sockaddr dst; 1395 struct sockaddr_in6 dst6; 1396 } u; 1397 struct route *ro; 1398 # else 1399 struct route_in6 ip6route; 1400 struct sockaddr_in6 *dst6; 1401 struct route_in6 *ro; 1402 # endif 1403 struct rtentry *rt; 1404 struct ifnet *ifp; 1405 u_long mtu; 1406 int error; 1407 1408 error = 0; 1409 ro = &ip6route; 1410 1411 if (fdp != NULL) 1412 ifp = fdp->fd_ptr; 1413 else 1414 ifp = fin->fin_ifp; 1415 memset(ro, 0, sizeof(*ro)); 1416 # if __NetBSD_Version__ >= 499001100 1417 if (fdp != NULL && IP6_NOTZERO(&fdp->fd_ip6)) 1418 sockaddr_in6_init(&u.dst6, &fdp->fd_ip6.in6, 0, 0, 0); 1419 else 1420 sockaddr_in6_init(&u.dst6, &fin->fin_fi.fi_dst.in6, 0, 0, 0); 1421 dst = &u.dst; 1422 rtcache_setdst(ro, dst); 1423 1424 rt = rtcache_init(ro); 1425 if ((ifp == NULL) && (rt != NULL)) 1426 ifp = rt->rt_ifp; 1427 # else 1428 dst6 = (struct sockaddr_in6 *)&ro->ro_dst; 1429 dst6->sin6_family = AF_INET6; 1430 dst6->sin6_len = sizeof(struct sockaddr_in6); 1431 dst6->sin6_addr = fin->fin_fi.fi_dst.in6; 1432 1433 if (fdp != NULL) { 1434 if (IP6_NOTZERO(&fdp->fd_ip6)) 1435 dst6->sin6_addr = fdp->fd_ip6.in6; 1436 } 1437 1438 rtalloc((struct route *)ro); 1439 1440 if ((ifp == NULL) && (ro->ro_rt != NULL)) 1441 ifp = ro->ro_rt->rt_ifp; 1442 rt = ro->ro_rt; 1443 # endif 1444 if ((rt == NULL) || (ifp == NULL)) { 1445 1446 error = EHOSTUNREACH; 1447 goto bad; 1448 } 1449 1450 /* KAME */ 1451 # if __NetBSD_Version__ >= 499001100 1452 if (IN6_IS_ADDR_LINKLOCAL(&u.dst6.sin6_addr)) 1453 u.dst6.sin6_addr.s6_addr16[1] = htons(ifp->if_index); 1454 # else 1455 if (IN6_IS_ADDR_LINKLOCAL(&dst6->sin6_addr)) 1456 dst6->sin6_addr.s6_addr16[1] = htons(ifp->if_index); 1457 # endif 1458 1459 { 1460 # if (__NetBSD_Version__ >= 106010000) && !defined(IN6_LINKMTU) 1461 struct in6_ifextra *ife; 1462 # endif 1463 if (rt->rt_flags & RTF_GATEWAY) 1464 # if __NetBSD_Version__ >= 499001100 1465 dst = rt->rt_gateway; 1466 # else 1467 dst6 = (struct sockaddr_in6 *)rt->rt_gateway; 1468 # endif 1469 rt->rt_use++; 1470 1471 /* Determine path MTU. */ 1472 # if (__NetBSD_Version__ <= 106009999) 1473 mtu = nd_ifinfo[ifp->if_index].linkmtu; 1474 # else 1475 # ifdef IN6_LINKMTU 1476 mtu = IN6_LINKMTU(ifp); 1477 # else 1478 ife = (struct in6_ifextra *)(ifp)->if_afdata[AF_INET6]; 1479 mtu = ife->nd_ifinfo[ifp->if_index].linkmtu; 1480 # endif 1481 # endif 1482 if ((error == 0) && (m0->m_pkthdr.len <= mtu)) { 1483 # if __NetBSD_Version__ >= 499001100 1484 error = ip6_if_output(ifp, ifp, m0, satocsin6(dst), rt); 1485 # else 1486 error = nd6_output(ifp, ifp, m0, dst6, rt); 1487 # endif 1488 } else { 1489 error = EMSGSIZE; 1490 } 1491 } 1492 bad: 1493 # if __NetBSD_Version__ >= 499001100 1494 rtcache_unref(rt, ro); 1495 rtcache_free(ro); 1496 # else 1497 if (ro->ro_rt != NULL) { 1498 RTFREE(((struct route *)ro)->ro_rt); 1499 } 1500 # endif 1501 return error; 1502 } 1503 #endif /* INET6 */ 1504 1505 1506 int 1507 ipf_verifysrc(fr_info_t *fin) 1508 { 1509 #if __NetBSD_Version__ >= 499001100 1510 union { 1511 struct sockaddr dst; 1512 struct sockaddr_in dst4; 1513 } u; 1514 struct rtentry *rt; 1515 #else 1516 struct sockaddr_in *dst; 1517 #endif 1518 struct route iproute; 1519 int rc; 1520 1521 #if __NetBSD_Version__ >= 499001100 1522 sockaddr_in_init(&u.dst4, &fin->fin_src, 0); 1523 rtcache_setdst(&iproute, &u.dst); 1524 rt = rtcache_init(&iproute); 1525 if (rt == NULL) 1526 rc = 0; 1527 else 1528 rc = (fin->fin_ifp == rt->rt_ifp); 1529 rtcache_unref(rt, &iproute); 1530 rtcache_free(&iproute); 1531 #else 1532 dst = (struct sockaddr_in *)&iproute.ro_dst; 1533 dst->sin_len = sizeof(*dst); 1534 dst->sin_family = AF_INET; 1535 dst->sin_addr = fin->fin_src; 1536 rtalloc(&iproute); 1537 if (iproute.ro_rt == NULL) 1538 return 0; 1539 rc = (fin->fin_ifp == iproute.ro_rt->rt_ifp); 1540 RTFREE(iproute.ro_rt); 1541 #endif 1542 return rc; 1543 } 1544 1545 1546 /* 1547 * return the first IP Address associated with an interface 1548 */ 1549 int 1550 ipf_ifpaddr(ipf_main_softc_t *softc, int v, int atype, void *ifptr, 1551 i6addr_t *inp, i6addr_t *inpmask) 1552 { 1553 #ifdef USE_INET6 1554 struct in6_addr *inp6 = NULL; 1555 #endif 1556 struct sockaddr *sock, *mask; 1557 struct sockaddr_in *sin; 1558 struct ifaddr *ifa; 1559 struct ifnet *ifp; 1560 1561 if ((ifptr == NULL) || (ifptr == (void *)-1)) 1562 return -1; 1563 1564 ifp = ifptr; 1565 mask = NULL; 1566 1567 if (v == 4) 1568 inp->in4.s_addr = 0; 1569 #ifdef USE_INET6 1570 else if (v == 6) 1571 bzero((char *)inp, sizeof(*inp)); 1572 #endif 1573 1574 ifa = IFADDR_READER_FIRST(ifp); 1575 sock = ifa ? ifa->ifa_addr : NULL; 1576 while (sock != NULL && ifa != NULL) { 1577 sin = (struct sockaddr_in *)sock; 1578 if ((v == 4) && (sin->sin_family == AF_INET)) 1579 break; 1580 #ifdef USE_INET6 1581 if ((v == 6) && (sin->sin_family == AF_INET6)) { 1582 inp6 = &((struct sockaddr_in6 *)sin)->sin6_addr; 1583 if (!IN6_IS_ADDR_LINKLOCAL(inp6) && 1584 !IN6_IS_ADDR_LOOPBACK(inp6)) 1585 break; 1586 } 1587 #endif 1588 ifa = IFADDR_READER_NEXT(ifa); 1589 if (ifa != NULL) 1590 sock = ifa->ifa_addr; 1591 } 1592 if (ifa == NULL || sock == NULL) 1593 return -1; 1594 1595 mask = ifa->ifa_netmask; 1596 if (atype == FRI_BROADCAST) 1597 sock = ifa->ifa_broadaddr; 1598 else if (atype == FRI_PEERADDR) 1599 sock = ifa->ifa_dstaddr; 1600 1601 #ifdef USE_INET6 1602 if (v == 6) 1603 return ipf_ifpfillv6addr(atype, (struct sockaddr_in6 *)sock, 1604 (struct sockaddr_in6 *)mask, 1605 inp, inpmask); 1606 #endif 1607 return ipf_ifpfillv4addr(atype, (struct sockaddr_in *)sock, 1608 (struct sockaddr_in *)mask, 1609 &inp->in4, &inpmask->in4); 1610 } 1611 1612 1613 u_32_t 1614 ipf_newisn(fr_info_t *fin) 1615 { 1616 #if __NetBSD_Version__ >= 105190000 /* 1.5T */ 1617 size_t asz; 1618 1619 if (fin->fin_v == 4) 1620 asz = sizeof(struct in_addr); 1621 else if (fin->fin_v == 6) 1622 asz = sizeof(fin->fin_src); 1623 else /* XXX: no way to return error */ 1624 return 0; 1625 #ifdef INET 1626 return tcp_new_iss1((void *)&fin->fin_src, (void *)&fin->fin_dst, 1627 fin->fin_sport, fin->fin_dport, asz, 0); 1628 #else 1629 return ENOSYS; 1630 #endif 1631 #else 1632 static int iss_seq_off = 0; 1633 u_char hash[16]; 1634 u_32_t newiss; 1635 MD5_CTX ctx; 1636 1637 /* 1638 * Compute the base value of the ISS. It is a hash 1639 * of (saddr, sport, daddr, dport, secret). 1640 */ 1641 MD5Init(&ctx); 1642 1643 MD5Update(&ctx, (u_char *) &fin->fin_fi.fi_src, 1644 sizeof(fin->fin_fi.fi_src)); 1645 MD5Update(&ctx, (u_char *) &fin->fin_fi.fi_dst, 1646 sizeof(fin->fin_fi.fi_dst)); 1647 MD5Update(&ctx, (u_char *) &fin->fin_dat, sizeof(fin->fin_dat)); 1648 1649 MD5Update(&ctx, ipf_iss_secret, sizeof(ipf_iss_secret)); 1650 1651 MD5Final(hash, &ctx); 1652 1653 memcpy(&newiss, hash, sizeof(newiss)); 1654 1655 /* 1656 * Now increment our "timer", and add it in to 1657 * the computed value. 1658 * 1659 * XXX Use `addin'? 1660 * XXX TCP_ISSINCR too large to use? 1661 */ 1662 iss_seq_off += 0x00010000; 1663 newiss += iss_seq_off; 1664 return newiss; 1665 #endif 1666 } 1667 1668 1669 /* ------------------------------------------------------------------------ */ 1670 /* Function: ipf_nextipid */ 1671 /* Returns: int - 0 == success, -1 == error (packet should be droppped) */ 1672 /* Parameters: fin(I) - pointer to packet information */ 1673 /* */ 1674 /* Returns the next IPv4 ID to use for this packet. */ 1675 /* ------------------------------------------------------------------------ */ 1676 u_short 1677 ipf_nextipid(fr_info_t *fin) 1678 { 1679 #ifdef USE_MUTEXES 1680 ipf_main_softc_t *softc = fin->fin_main_soft; 1681 #endif 1682 u_short id; 1683 1684 MUTEX_ENTER(&softc->ipf_rw); 1685 id = ipid++; 1686 MUTEX_EXIT(&softc->ipf_rw); 1687 1688 return id; 1689 } 1690 1691 1692 EXTERN_INLINE int 1693 ipf_checkv4sum(fr_info_t *fin) 1694 { 1695 #ifdef M_CSUM_TCP_UDP_BAD 1696 int manual, pflag, cflags, active; 1697 mb_t *m; 1698 1699 if ((fin->fin_flx & FI_NOCKSUM) != 0) 1700 return 0; 1701 1702 if ((fin->fin_flx & FI_SHORT) != 0) 1703 return 1; 1704 1705 if (fin->fin_cksum != FI_CK_NEEDED) 1706 return (fin->fin_cksum > FI_CK_NEEDED) ? 0 : -1; 1707 1708 manual = 0; 1709 m = fin->fin_m; 1710 if (m == NULL) { 1711 manual = 1; 1712 goto skipauto; 1713 } 1714 1715 switch (fin->fin_p) 1716 { 1717 case IPPROTO_UDP : 1718 pflag = M_CSUM_UDPv4; 1719 break; 1720 case IPPROTO_TCP : 1721 pflag = M_CSUM_TCPv4; 1722 break; 1723 default : 1724 pflag = 0; 1725 manual = 1; 1726 break; 1727 } 1728 1729 active = ((struct ifnet *)fin->fin_ifp)->if_csum_flags_rx & pflag; 1730 active |= M_CSUM_TCP_UDP_BAD | M_CSUM_DATA; 1731 cflags = m->m_pkthdr.csum_flags & active; 1732 1733 if (pflag != 0) { 1734 if (cflags == (pflag | M_CSUM_TCP_UDP_BAD)) { 1735 fin->fin_flx |= FI_BAD; 1736 fin->fin_cksum = FI_CK_BAD; 1737 } else if (cflags == (pflag | M_CSUM_DATA)) { 1738 if ((m->m_pkthdr.csum_data ^ 0xffff) != 0) { 1739 fin->fin_flx |= FI_BAD; 1740 fin->fin_cksum = FI_CK_BAD; 1741 } else { 1742 fin->fin_cksum = FI_CK_SUMOK; 1743 } 1744 } else if (cflags == pflag) { 1745 fin->fin_cksum = FI_CK_SUMOK; 1746 } else { 1747 manual = 1; 1748 } 1749 } 1750 skipauto: 1751 if (manual != 0) { 1752 if (ipf_checkl4sum(fin) == -1) { 1753 fin->fin_flx |= FI_BAD; 1754 return -1; 1755 } 1756 } 1757 #else 1758 if (ipf_checkl4sum(fin) == -1) { 1759 fin->fin_flx |= FI_BAD; 1760 return -1; 1761 } 1762 #endif 1763 return 0; 1764 } 1765 1766 1767 #ifdef USE_INET6 1768 EXTERN_INLINE int 1769 ipf_checkv6sum(fr_info_t *fin) 1770 { 1771 # ifdef M_CSUM_TCP_UDP_BAD 1772 int manual, pflag, cflags, active; 1773 mb_t *m; 1774 1775 if ((fin->fin_flx & FI_NOCKSUM) != 0) 1776 return 0; 1777 1778 if ((fin->fin_flx & FI_SHORT) != 0) 1779 return 1; 1780 1781 if (fin->fin_cksum != FI_CK_SUMOK) 1782 return (fin->fin_cksum > FI_CK_NEEDED) ? 0 : -1; 1783 1784 1785 manual = 0; 1786 m = fin->fin_m; 1787 1788 switch (fin->fin_p) 1789 { 1790 case IPPROTO_UDP : 1791 pflag = M_CSUM_UDPv6; 1792 break; 1793 case IPPROTO_TCP : 1794 pflag = M_CSUM_TCPv6; 1795 break; 1796 default : 1797 pflag = 0; 1798 manual = 1; 1799 break; 1800 } 1801 1802 active = ((struct ifnet *)fin->fin_ifp)->if_csum_flags_rx & pflag; 1803 active |= M_CSUM_TCP_UDP_BAD | M_CSUM_DATA; 1804 cflags = m->m_pkthdr.csum_flags & active; 1805 1806 if (pflag != 0) { 1807 if (cflags == (pflag | M_CSUM_TCP_UDP_BAD)) { 1808 fin->fin_flx |= FI_BAD; 1809 } else if (cflags == (pflag | M_CSUM_DATA)) { 1810 if ((m->m_pkthdr.csum_data ^ 0xffff) != 0) 1811 fin->fin_flx |= FI_BAD; 1812 } else if (cflags == pflag) { 1813 ; 1814 } else { 1815 manual = 1; 1816 } 1817 } 1818 if (manual != 0) { 1819 if (ipf_checkl4sum(fin) == -1) { 1820 fin->fin_flx |= FI_BAD; 1821 return -1; 1822 } 1823 } 1824 # else 1825 if (ipf_checkl4sum(fin) == -1) { 1826 fin->fin_flx |= FI_BAD; 1827 return -1; 1828 } 1829 # endif 1830 return 0; 1831 } 1832 #endif /* USE_INET6 */ 1833 1834 1835 size_t 1836 mbufchainlen(struct mbuf *m0) 1837 { 1838 size_t len; 1839 1840 if ((m0->m_flags & M_PKTHDR) != 0) { 1841 len = m0->m_pkthdr.len; 1842 } else { 1843 struct mbuf *m; 1844 1845 for (m = m0, len = 0; m != NULL; m = m->m_next) 1846 len += m->m_len; 1847 } 1848 return len; 1849 } 1850 1851 1852 /* ------------------------------------------------------------------------ */ 1853 /* Function: ipf_pullup */ 1854 /* Returns: NULL == pullup failed, else pointer to protocol header */ 1855 /* Parameters: xmin(I)- pointer to buffer where data packet starts */ 1856 /* fin(I) - pointer to packet information */ 1857 /* len(I) - number of bytes to pullup */ 1858 /* */ 1859 /* Attempt to move at least len bytes (from the start of the buffer) into a */ 1860 /* single buffer for ease of access. Operating system native functions are */ 1861 /* used to manage buffers - if necessary. If the entire packet ends up in */ 1862 /* a single buffer, set the FI_COALESCE flag even though ipf_coalesce() has */ 1863 /* not been called. Both fin_ip and fin_dp are updated before exiting _IF_ */ 1864 /* and ONLY if the pullup succeeds. */ 1865 /* */ 1866 /* We assume that 'xmin' is a pointer to a buffer that is part of the chain */ 1867 /* of buffers that starts at *fin->fin_mp. */ 1868 /* ------------------------------------------------------------------------ */ 1869 void * 1870 ipf_pullup(mb_t *xmin, fr_info_t *fin, int len) 1871 { 1872 int dpoff, ipoff; 1873 mb_t *m = xmin; 1874 char *ip; 1875 1876 if (m == NULL) 1877 return NULL; 1878 1879 ip = (char *)fin->fin_ip; 1880 if ((fin->fin_flx & FI_COALESCE) != 0) 1881 return ip; 1882 1883 ipoff = fin->fin_ipoff; 1884 if (fin->fin_dp != NULL) 1885 dpoff = (char *)fin->fin_dp - (char *)ip; 1886 else 1887 dpoff = 0; 1888 1889 if (M_LEN(m) < len) { 1890 mb_t *n = *fin->fin_mp; 1891 /* 1892 * Assume that M_PKTHDR is set and just work with what is left 1893 * rather than check.. 1894 * Should not make any real difference, anyway. 1895 */ 1896 if (m != n) { 1897 /* 1898 * Record the mbuf that points to the mbuf that we're 1899 * about to go to work on so that we can update the 1900 * m_next appropriately later. 1901 */ 1902 for (; n->m_next != m; n = n->m_next) 1903 ; 1904 } else { 1905 n = NULL; 1906 } 1907 1908 #ifdef MHLEN 1909 if (len > MHLEN) 1910 #else 1911 if (len > MLEN) 1912 #endif 1913 { 1914 #ifdef HAVE_M_PULLDOWN 1915 if (m_pulldown(m, 0, len, NULL) == NULL) 1916 m = NULL; 1917 #else 1918 FREE_MB_T(*fin->fin_mp); 1919 m = NULL; 1920 n = NULL; 1921 #endif 1922 } else 1923 { 1924 m = m_pullup(m, len); 1925 } 1926 if (n != NULL) 1927 n->m_next = m; 1928 if (m == NULL) { 1929 /* 1930 * When n is non-NULL, it indicates that m pointed to 1931 * a sub-chain (tail) of the mbuf and that the head 1932 * of this chain has not yet been free'd. 1933 */ 1934 if (n != NULL) { 1935 FREE_MB_T(*fin->fin_mp); 1936 } 1937 1938 *fin->fin_mp = NULL; 1939 fin->fin_m = NULL; 1940 return NULL; 1941 } 1942 1943 if (n == NULL) 1944 *fin->fin_mp = m; 1945 1946 while (M_LEN(m) == 0) { 1947 m = m->m_next; 1948 } 1949 fin->fin_m = m; 1950 ip = MTOD(m, char *) + ipoff; 1951 1952 fin->fin_ip = (ip_t *)ip; 1953 if (fin->fin_dp != NULL) 1954 fin->fin_dp = (char *)fin->fin_ip + dpoff; 1955 if (fin->fin_fraghdr != NULL) 1956 fin->fin_fraghdr = (char *)ip + 1957 ((char *)fin->fin_fraghdr - 1958 (char *)fin->fin_ip); 1959 } 1960 1961 if (len == fin->fin_plen) 1962 fin->fin_flx |= FI_COALESCE; 1963 return ip; 1964 } 1965 1966 1967 int 1968 ipf_inject(fr_info_t *fin, mb_t *m) 1969 { 1970 int error; 1971 1972 if (fin->fin_out == 0) { 1973 if (__predict_false(!pktq_enqueue(ip_pktq, m, 0))) { 1974 FREE_MB_T(m); 1975 error = ENOBUFS; 1976 } else { 1977 error = 0; 1978 } 1979 } else { 1980 error = ip_output(m, NULL, NULL, IP_FORWARDING, NULL, NULL); 1981 } 1982 return error; 1983 } 1984 1985 1986 u_32_t 1987 ipf_random(void) 1988 { 1989 int number; 1990 1991 #ifdef _CPRNG_H 1992 number = cprng_fast32(); 1993 #else 1994 number = arc4random(); 1995 #endif 1996 return number; 1997 } 1998 1999 2000 /* 2001 * routines below for saving IP headers to buffer 2002 */ 2003 static int ipfopen(dev_t dev, int flags 2004 #if (NetBSD >= 199511) 2005 , int devtype, PROC_T *p 2006 #endif 2007 ) 2008 { 2009 u_int unit = GET_MINOR(dev); 2010 int error; 2011 2012 if (IPL_LOGMAX < unit) { 2013 error = ENXIO; 2014 } else { 2015 switch (unit) 2016 { 2017 case IPL_LOGIPF : 2018 case IPL_LOGNAT : 2019 case IPL_LOGSTATE : 2020 case IPL_LOGAUTH : 2021 case IPL_LOGLOOKUP : 2022 case IPL_LOGSYNC : 2023 #ifdef IPFILTER_SCAN 2024 case IPL_LOGSCAN : 2025 #endif 2026 error = 0; 2027 break; 2028 default : 2029 error = ENXIO; 2030 break; 2031 } 2032 } 2033 #if (__NetBSD_Version__ >= 799003000) 2034 if (error == 0) { 2035 mutex_enter(&ipf_ref_mutex); 2036 ipf_active = 1; 2037 mutex_exit(&ipf_ref_mutex); 2038 } 2039 #endif 2040 return error; 2041 } 2042 2043 2044 static int ipfclose(dev_t dev, int flags 2045 #if (NetBSD >= 199511) 2046 , int devtype, PROC_T *p 2047 #endif 2048 ) 2049 { 2050 u_int unit = GET_MINOR(dev); 2051 2052 if (IPL_LOGMAX < unit) 2053 return ENXIO; 2054 else { 2055 #if (__NetBSD_Version__ >= 799003000) 2056 mutex_enter(&ipf_ref_mutex); 2057 ipf_active = 0; 2058 mutex_exit(&ipf_ref_mutex); 2059 #endif 2060 return 0; 2061 } 2062 } 2063 2064 /* 2065 * ipfread/ipflog 2066 * both of these must operate with at least splnet() lest they be 2067 * called during packet processing and cause an inconsistancy to appear in 2068 * the filter lists. 2069 */ 2070 static int ipfread(dev_t dev, struct uio *uio, int ioflag) 2071 { 2072 2073 if (ipfmain.ipf_running < 1) { 2074 ipfmain.ipf_interror = 130006; 2075 return EIO; 2076 } 2077 2078 if (GET_MINOR(dev) == IPL_LOGSYNC) 2079 return ipf_sync_read(&ipfmain, uio); 2080 2081 #ifdef IPFILTER_LOG 2082 return ipf_log_read(&ipfmain, GET_MINOR(dev), uio); 2083 #else 2084 ipfmain.ipf_interror = 130007; 2085 return ENXIO; 2086 #endif 2087 } 2088 2089 2090 /* 2091 * ipfwrite 2092 * both of these must operate with at least splnet() lest they be 2093 * called during packet processing and cause an inconsistancy to appear in 2094 * the filter lists. 2095 */ 2096 static int ipfwrite(dev_t dev, struct uio *uio, int ioflag) 2097 { 2098 2099 if (ipfmain.ipf_running < 1) { 2100 ipfmain.ipf_interror = 130008; 2101 return EIO; 2102 } 2103 2104 if (GET_MINOR(dev) == IPL_LOGSYNC) 2105 return ipf_sync_write(&ipfmain, uio); 2106 ipfmain.ipf_interror = 130009; 2107 return ENXIO; 2108 } 2109 2110 2111 static int ipfpoll(dev_t dev, int events, PROC_T *p) 2112 { 2113 u_int unit = GET_MINOR(dev); 2114 int revents = 0; 2115 2116 if (IPL_LOGMAX < unit) { 2117 ipfmain.ipf_interror = 130010; 2118 return ENXIO; 2119 } 2120 2121 switch (unit) 2122 { 2123 case IPL_LOGIPF : 2124 case IPL_LOGNAT : 2125 case IPL_LOGSTATE : 2126 #ifdef IPFILTER_LOG 2127 if ((events & (POLLIN | POLLRDNORM)) && 2128 ipf_log_canread(&ipfmain, unit)) 2129 revents |= events & (POLLIN | POLLRDNORM); 2130 #endif 2131 break; 2132 case IPL_LOGAUTH : 2133 if ((events & (POLLIN | POLLRDNORM)) && 2134 ipf_auth_waiting(&ipfmain)) 2135 revents |= events & (POLLIN | POLLRDNORM); 2136 break; 2137 case IPL_LOGSYNC : 2138 if ((events & (POLLIN | POLLRDNORM)) && 2139 ipf_sync_canread(&ipfmain)) 2140 revents |= events & (POLLIN | POLLRDNORM); 2141 if ((events & (POLLOUT | POLLWRNORM)) && 2142 ipf_sync_canwrite(&ipfmain)) 2143 revents |= events & (POLLOUT | POLLWRNORM); 2144 break; 2145 case IPL_LOGSCAN : 2146 case IPL_LOGLOOKUP : 2147 default : 2148 break; 2149 } 2150 2151 if ((revents == 0) && (((events & (POLLIN|POLLRDNORM)) != 0))) 2152 selrecord(p, &ipfmain.ipf_selwait[unit]); 2153 return revents; 2154 } 2155 2156 u_int 2157 ipf_pcksum(fr_info_t *fin, int hlen, u_int sum) 2158 { 2159 struct mbuf *m; 2160 u_int sum2; 2161 int off; 2162 2163 m = fin->fin_m; 2164 off = (char *)fin->fin_dp - (char *)fin->fin_ip; 2165 m->m_data += hlen; 2166 m->m_len -= hlen; 2167 sum2 = in_cksum(fin->fin_m, fin->fin_plen - off); 2168 m->m_len += hlen; 2169 m->m_data -= hlen; 2170 2171 /* 2172 * Both sum and sum2 are partial sums, so combine them together. 2173 */ 2174 sum += ~sum2 & 0xffff; 2175 while (sum > 0xffff) 2176 sum = (sum & 0xffff) + (sum >> 16); 2177 sum2 = ~sum & 0xffff; 2178 return sum2; 2179 } 2180 2181 #if (__NetBSD_Version__ >= 799003000) 2182 2183 /* NetBSD module interface */ 2184 2185 MODULE(MODULE_CLASS_DRIVER, ipl, "bpf_filter"); 2186 2187 static int ipl_init(void *); 2188 static int ipl_fini(void *); 2189 static int ipl_modcmd(modcmd_t, void *); 2190 2191 #ifdef _MODULE 2192 static devmajor_t ipl_cmaj = -1, ipl_bmaj = -1; 2193 #endif 2194 2195 static int 2196 ipl_modcmd(modcmd_t cmd, void *opaque) 2197 { 2198 2199 switch (cmd) { 2200 case MODULE_CMD_INIT: 2201 return ipl_init(opaque); 2202 case MODULE_CMD_FINI: 2203 return ipl_fini(opaque); 2204 default: 2205 return ENOTTY; 2206 } 2207 } 2208 2209 static int 2210 ipl_init(void *opaque) 2211 { 2212 int error; 2213 2214 ipf_listener = kauth_listen_scope(KAUTH_SCOPE_NETWORK, 2215 ipf_listener_cb, NULL); 2216 2217 if ((error = ipf_load_all()) != 0) 2218 return error; 2219 2220 if (ipf_create_all(&ipfmain) == NULL) { 2221 ipf_unload_all(); 2222 return ENODEV; 2223 } 2224 2225 /* Initialize our mutex and reference count */ 2226 mutex_init(&ipf_ref_mutex, MUTEX_DEFAULT, IPL_NONE); 2227 ipf_active = 0; 2228 2229 #ifdef _MODULE 2230 /* 2231 * Insert ourself into the cdevsw list. 2232 */ 2233 error = devsw_attach("ipl", NULL, &ipl_bmaj, &ipl_cdevsw, &ipl_cmaj); 2234 if (error) 2235 ipl_fini(opaque); 2236 #endif 2237 2238 return error; 2239 } 2240 2241 static int 2242 ipl_fini(void *opaque) 2243 { 2244 2245 #ifdef _MODULE 2246 (void)devsw_detach(NULL, &ipl_cdevsw); 2247 #endif 2248 2249 /* 2250 * Grab the mutex, verify that there are no references 2251 * and that there are no running filters. If either 2252 * of these exists, reinsert our cdevsw entry and return 2253 * an error. 2254 */ 2255 mutex_enter(&ipf_ref_mutex); 2256 if (ipf_active != 0 || ipfmain.ipf_running > 0) { 2257 #ifdef _MODULE 2258 (void)devsw_attach("ipl", NULL, &ipl_bmaj, 2259 &ipl_cdevsw, &ipl_cmaj); 2260 #endif 2261 mutex_exit(&ipf_ref_mutex); 2262 return EBUSY; 2263 } 2264 2265 /* Clean up the rest of our state before being unloaded */ 2266 2267 mutex_exit(&ipf_ref_mutex); 2268 mutex_destroy(&ipf_ref_mutex); 2269 ipf_destroy_all(&ipfmain); 2270 ipf_unload_all(); 2271 kauth_unlisten_scope(ipf_listener); 2272 2273 return 0; 2274 } 2275 #endif /* (__NetBSD_Version__ >= 799003000) */ 2276
Indexes created Sat Oct 11 08:10:02 GMT 2025