ip_fil_netbsd.c revision 1.21
1 /* $NetBSD: ip_fil_netbsd.c,v 1.21 2016/12/28 19:53:02 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 1.21 2016/12/28 19:53:02 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 #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 .d_open = ipfopen, 142 .d_close = ipfclose, 143 .d_read = ipfread, 144 .d_write = ipfwrite, 145 .d_ioctl = ipfioctl, 146 .d_stop = nostop, 147 .d_tty = notty, 148 .d_poll = ipfpoll, 149 .d_mmap = nommap, 150 #if (__NetBSD_Version__ >= 200000000) 151 .d_kqfilter = nokqfilter, 152 #endif 153 .d_discard = nodiscard, 154 #ifdef D_OTHER 155 .d_flag = D_OTHER 156 #else 157 .d_flag = 0 158 #endif 159 }; 160 #if (__NetBSD_Version__ >= 799003000) 161 kmutex_t ipf_ref_mutex; 162 int ipf_active; 163 #endif 164 165 ipf_main_softc_t ipfmain; 166 167 static u_short ipid = 0; 168 static int (*ipf_savep)(void *, ip_t *, int, void *, int, struct mbuf **); 169 static int ipf_send_ip(fr_info_t *, mb_t *); 170 #ifdef USE_INET6 171 static int ipf_fastroute6(struct mbuf *, struct mbuf **, 172 fr_info_t *, frdest_t *); 173 #endif 174 175 #if defined(NETBSD_PF) 176 # include <net/pfil.h> 177 /* 178 * We provide the ipf_checkp name just to minimize changes later. 179 */ 180 int (*ipf_checkp)(void *, ip_t *ip, int hlen, void *ifp, int out, mb_t **mp); 181 #endif /* NETBSD_PF */ 182 183 #if defined(__NetBSD_Version__) && (__NetBSD_Version__ >= 105110000) 184 # include <net/pfil.h> 185 186 static int ipf_check_wrapper(void *, struct mbuf **, struct ifnet *, int ); 187 188 static int 189 ipf_check_wrapper(void *arg, struct mbuf **mp, struct ifnet *ifp, int dir) 190 { 191 struct ip *ip; 192 int rv, hlen; 193 194 #if __NetBSD_Version__ >= 200080000 195 /* 196 * ensure that mbufs are writable beforehand 197 * as it's assumed by ipf code. 198 * XXX inefficient 199 */ 200 int error = m_makewritable(mp, 0, M_COPYALL, M_DONTWAIT); 201 202 if (error) { 203 m_freem(*mp); 204 *mp = NULL; 205 return error; 206 } 207 #endif 208 ip = mtod(*mp, struct ip *); 209 hlen = ip->ip_hl << 2; 210 211 #ifdef INET 212 #if defined(M_CSUM_TCPv4) 213 /* 214 * If the packet is out-bound, we can't delay checksums 215 * here. For in-bound, the checksum has already been 216 * validated. 217 */ 218 if (dir == PFIL_OUT) { 219 if ((*mp)->m_pkthdr.csum_flags & (M_CSUM_TCPv4|M_CSUM_UDPv4)) { 220 in_delayed_cksum(*mp); 221 (*mp)->m_pkthdr.csum_flags &= 222 ~(M_CSUM_TCPv4|M_CSUM_UDPv4); 223 } 224 } 225 #endif /* M_CSUM_TCPv4 */ 226 #endif /* INET */ 227 228 /* 229 * Note, we don't need to update the checksum, because 230 * it has already been verified. 231 */ 232 rv = ipf_check(&ipfmain, ip, hlen, ifp, (dir == PFIL_OUT), mp); 233 234 return (rv); 235 } 236 237 # ifdef USE_INET6 238 # include <netinet/ip6.h> 239 240 static int ipf_check_wrapper6(void *, struct mbuf **, struct ifnet *, int ); 241 242 static int 243 ipf_check_wrapper6(void *arg, struct mbuf **mp, struct ifnet *ifp, int dir) 244 { 245 #if defined(INET6) 246 # if defined(M_CSUM_TCPv6) && (__NetBSD_Version__ > 200000000) 247 /* 248 * If the packet is out-bound, we can't delay checksums 249 * here. For in-bound, the checksum has already been 250 * validated. 251 */ 252 if (dir == PFIL_OUT) { 253 if ((*mp)->m_pkthdr.csum_flags & (M_CSUM_TCPv6|M_CSUM_UDPv6)) { 254 # if (__NetBSD_Version__ > 399000600) 255 in6_delayed_cksum(*mp); 256 # endif 257 (*mp)->m_pkthdr.csum_flags &= ~(M_CSUM_TCPv6| 258 M_CSUM_UDPv6); 259 } 260 } 261 # endif 262 #endif /* INET6 */ 263 264 return (ipf_check(&ipfmain, mtod(*mp, struct ip *), sizeof(struct ip6_hdr), 265 ifp, (dir == PFIL_OUT), mp)); 266 } 267 # endif 268 269 270 # if defined(PFIL_TYPE_IFNET) && defined(PFIL_IFNET) 271 272 # if (__NetBSD_Version__ >= 799000400) 273 274 static void ipf_pfilsync(void *, unsigned long, void *); 275 276 static void 277 ipf_pfilsync(void *hdr, unsigned long cmd, void *arg2) 278 { 279 /* 280 * The interface pointer is useless for create (we have nothing to 281 * compare it to) and at detach, the interface name is still in the 282 * list of active NICs (albeit, down, but that's not any real 283 * indicator) and doing ifunit() on the name will still return the 284 * pointer, so it's not much use then, either. 285 */ 286 ipf_sync(&ipfmain, NULL); 287 } 288 289 # else 290 291 static int ipf_pfilsync(void *, struct mbuf **, struct ifnet *, int); 292 293 static int 294 ipf_pfilsync(void *hdr, struct mbuf **mp, struct ifnet *ifp, int dir) 295 { 296 ipf_sync(&ipfmain, NULL); 297 return 0; 298 } 299 300 # endif 301 # endif 302 303 #endif /* __NetBSD_Version__ >= 105110000 */ 304 305 306 #if defined(IPFILTER_LKM) 307 int 308 ipf_identify(s) 309 char *s; 310 { 311 if (strcmp(s, "ipl") == 0) 312 return 1; 313 return 0; 314 } 315 #endif /* IPFILTER_LKM */ 316 317 #if (__NetBSD_Version__ >= 599002000) 318 static int 319 ipf_listener_cb(kauth_cred_t cred, kauth_action_t action, void *cookie, 320 void *arg0, void *arg1, void *arg2, void *arg3) 321 { 322 int result; 323 enum kauth_network_req req; 324 325 result = KAUTH_RESULT_DEFER; 326 req = (enum kauth_network_req)arg0; 327 328 if (action != KAUTH_NETWORK_FIREWALL) 329 return result; 330 331 /* These must have came from device context. */ 332 if ((req == KAUTH_REQ_NETWORK_FIREWALL_FW) || 333 (req == KAUTH_REQ_NETWORK_FIREWALL_NAT)) 334 result = KAUTH_RESULT_ALLOW; 335 336 return result; 337 } 338 #endif 339 340 /* 341 * Try to detect the case when compiling for NetBSD with pseudo-device 342 */ 343 void 344 ipfilterattach(int count) 345 { 346 347 #if (__NetBSD_Version__ >= 799003000) 348 return; 349 #else 350 #if (__NetBSD_Version__ >= 599002000) 351 ipf_listener = kauth_listen_scope(KAUTH_SCOPE_NETWORK, 352 ipf_listener_cb, NULL); 353 #endif 354 355 if (ipf_load_all() == 0) 356 (void) ipf_create_all(&ipfmain); 357 #endif 358 } 359 360 361 int 362 ipfattach(ipf_main_softc_t *softc) 363 { 364 SPL_INT(s); 365 #if (__NetBSD_Version__ >= 499005500) 366 int i; 367 #endif 368 #if defined(NETBSD_PF) && (__NetBSD_Version__ >= 104200000) 369 int error = 0; 370 # if defined(__NetBSD_Version__) && (__NetBSD_Version__ >= 105110000) 371 pfil_head_t *ph_inet; 372 # ifdef USE_INET6 373 pfil_head_t *ph_inet6; 374 # endif 375 # if defined(PFIL_TYPE_IFNET) && defined(PFIL_IFNET) 376 pfil_head_t *ph_ifsync; 377 # endif 378 # endif 379 #endif 380 381 SPL_NET(s); 382 if ((softc->ipf_running > 0) || (ipf_checkp == ipf_check)) { 383 printf("IP Filter: already initialized\n"); 384 SPL_X(s); 385 IPFERROR(130017); 386 return EBUSY; 387 } 388 389 if (ipf_init_all(softc) < 0) { 390 SPL_X(s); 391 IPFERROR(130015); 392 return EIO; 393 } 394 395 #ifdef NETBSD_PF 396 # if (__NetBSD_Version__ >= 104200000) 397 # if __NetBSD_Version__ >= 105110000 398 ph_inet = pfil_head_get(PFIL_TYPE_AF, (void *)AF_INET); 399 # ifdef USE_INET6 400 ph_inet6 = pfil_head_get(PFIL_TYPE_AF, (void *)AF_INET6); 401 # endif 402 # if defined(PFIL_TYPE_IFNET) && defined(PFIL_IFNET) 403 ph_ifsync = pfil_head_get(PFIL_TYPE_IFNET, 0); 404 # endif 405 406 if (ph_inet == NULL 407 # ifdef USE_INET6 408 && ph_inet6 == NULL 409 # endif 410 # if defined(PFIL_TYPE_IFNET) && defined(PFIL_IFNET) 411 && ph_ifsync == NULL 412 # endif 413 ) { 414 SPL_X(s); 415 IPFERROR(130016); 416 return ENODEV; 417 } 418 419 if (ph_inet != NULL) 420 error = pfil_add_hook((void *)ipf_check_wrapper, NULL, 421 PFIL_IN|PFIL_OUT, ph_inet); 422 else 423 error = 0; 424 # else 425 error = pfil_add_hook((void *)ipf_check, PFIL_IN|PFIL_OUT, 426 &inetsw[ip_protox[IPPROTO_IP]].pr_pfh); 427 # endif 428 if (error) { 429 IPFERROR(130013); 430 goto pfil_error; 431 } 432 # else 433 pfil_add_hook((void *)ipf_check, PFIL_IN|PFIL_OUT); 434 # endif 435 436 # ifdef USE_INET6 437 # if __NetBSD_Version__ >= 105110000 438 if (ph_inet6 != NULL) 439 error = pfil_add_hook((void *)ipf_check_wrapper6, NULL, 440 PFIL_IN|PFIL_OUT, ph_inet6); 441 else 442 error = 0; 443 if (error) { 444 pfil_remove_hook((void *)ipf_check_wrapper6, NULL, 445 PFIL_IN|PFIL_OUT, ph_inet6); 446 ipfmain.ipf_interror = 130014; 447 goto pfil_error; 448 } 449 # else 450 error = pfil_add_hook((void *)ipf_check, PFIL_IN|PFIL_OUT, 451 &inetsw[ip_protox[IPPROTO_IPV6]].pr_pfh); 452 if (error) { 453 pfil_remove_hook((void *)ipf_check, PFIL_IN|PFIL_OUT, 454 &inetsw[ip_protox[IPPROTO_IP]].pr_pfh); 455 IPFERROR(130014); 456 goto pfil_error; 457 } 458 # endif 459 # endif 460 461 # if defined(PFIL_TYPE_IFNET) && defined(PFIL_IFNET) 462 if (ph_ifsync != NULL) 463 #if (__NetBSD_Version__ >= 799000400) 464 (void) pfil_add_ihook((void *)ipf_pfilsync, NULL, 465 PFIL_IFNET, ph_ifsync); 466 #else 467 (void) pfil_add_hook((void *)ipf_pfilsync, NULL, 468 PFIL_IFNET, ph_ifsync); 469 #endif 470 # endif 471 #endif 472 473 #if (__NetBSD_Version__ >= 499005500) 474 for (i = 0; i < IPL_LOGSIZE; i++) 475 selinit(&ipfmain.ipf_selwait[i]); 476 #else 477 bzero((char *)ipfmain.ipf_selwait, sizeof(ipfmain.ipf_selwait)); 478 #endif 479 ipf_savep = ipf_checkp; 480 ipf_checkp = ipf_check; 481 482 #ifdef INET 483 if (softc->ipf_control_forwarding & 1) 484 ipforwarding = 1; 485 #endif 486 487 ipid = 0; 488 489 SPL_X(s); 490 491 #if (__NetBSD_Version__ >= 104010000) 492 # if (__NetBSD_Version__ >= 499002000) 493 callout_init(&softc->ipf_slow_ch, 0); 494 # else 495 callout_init(&softc->ipf_slow_ch); 496 # endif 497 callout_reset(&softc->ipf_slow_ch, (hz / IPF_HZ_DIVIDE) * IPF_HZ_MULT, 498 ipf_timer_func, softc); 499 #else 500 timeout(ipf_timer_func, softc, (hz / IPF_HZ_DIVIDE) * IPF_HZ_MULT); 501 #endif 502 503 return 0; 504 505 #if __NetBSD_Version__ >= 105110000 506 pfil_error: 507 SPL_X(s); 508 ipf_fini_all(softc); 509 return error; 510 #endif 511 } 512 513 static void 514 ipf_timer_func(void *ptr) 515 { 516 ipf_main_softc_t *softc = ptr; 517 SPL_INT(s); 518 519 SPL_NET(s); 520 READ_ENTER(&softc->ipf_global); 521 522 if (softc->ipf_running > 0) 523 ipf_slowtimer(softc); 524 525 if (softc->ipf_running == -1 || softc->ipf_running == 1) { 526 #if NETBSD_GE_REV(104240000) 527 callout_reset(&softc->ipf_slow_ch, hz / 2, 528 ipf_timer_func, softc); 529 #else 530 timeout(ipf_timer_func, softc, 531 (hz / IPF_HZ_DIVIDE) * IPF_HZ_MULT); 532 #endif 533 } 534 RWLOCK_EXIT(&softc->ipf_global); 535 SPL_X(s); 536 } 537 538 539 /* 540 * Disable the filter by removing the hooks from the IP input/output 541 * stream. 542 */ 543 int 544 ipfdetach(ipf_main_softc_t *softc) 545 { 546 SPL_INT(s); 547 #if (__NetBSD_Version__ >= 499005500) 548 int i; 549 #endif 550 #if defined(NETBSD_PF) && (__NetBSD_Version__ >= 104200000) 551 int error = 0; 552 # if __NetBSD_Version__ >= 105150000 553 pfil_head_t *ph_inet = pfil_head_get(PFIL_TYPE_AF, (void *)AF_INET); 554 # ifdef USE_INET6 555 pfil_head_t *ph_inet6 = pfil_head_get(PFIL_TYPE_AF, (void *)AF_INET6); 556 # endif 557 # if defined(PFIL_TYPE_IFNET) && defined(PFIL_IFNET) 558 struct pfil_head *ph_ifsync = pfil_head_get(PFIL_TYPE_IFNET, 0); 559 # endif 560 # endif 561 #endif 562 563 SPL_NET(s); 564 565 #if (__NetBSD_Version__ >= 104010000) 566 if (softc->ipf_running > 0) 567 callout_stop(&softc->ipf_slow_ch); 568 #else 569 untimeout(ipf_slowtimer, NULL); 570 #endif /* NetBSD */ 571 572 ipf_checkp = ipf_savep; 573 (void) ipf_flush(softc, IPL_LOGIPF, FR_INQUE|FR_OUTQUE|FR_INACTIVE); 574 (void) ipf_flush(softc, IPL_LOGIPF, FR_INQUE|FR_OUTQUE); 575 576 #ifdef INET 577 if (softc->ipf_control_forwarding & 2) 578 ipforwarding = 0; 579 #endif 580 581 #ifdef NETBSD_PF 582 # if (__NetBSD_Version__ >= 104200000) 583 # if __NetBSD_Version__ >= 105110000 584 # if defined(PFIL_TYPE_IFNET) && defined(PFIL_IFNET) 585 (void) pfil_remove_hook((void *)ipf_pfilsync, NULL, 586 PFIL_IFNET, ph_ifsync); 587 # endif 588 589 if (ph_inet != NULL) 590 error = pfil_remove_hook((void *)ipf_check_wrapper, NULL, 591 PFIL_IN|PFIL_OUT, ph_inet); 592 else 593 error = 0; 594 # else 595 error = pfil_remove_hook((void *)ipf_check, PFIL_IN|PFIL_OUT, 596 &inetsw[ip_protox[IPPROTO_IP]].pr_pfh); 597 # endif 598 if (error) { 599 SPL_X(s); 600 IPFERROR(130011); 601 return error; 602 } 603 # else 604 pfil_remove_hook((void *)ipf_check, PFIL_IN|PFIL_OUT); 605 # endif 606 # ifdef USE_INET6 607 # if __NetBSD_Version__ >= 105110000 608 if (ph_inet6 != NULL) 609 error = pfil_remove_hook((void *)ipf_check_wrapper6, NULL, 610 PFIL_IN|PFIL_OUT, ph_inet6); 611 else 612 error = 0; 613 # else 614 error = pfil_remove_hook((void *)ipf_check, PFIL_IN|PFIL_OUT, 615 &inetsw[ip_protox[IPPROTO_IPV6]].pr_pfh); 616 # endif 617 if (error) { 618 SPL_X(s); 619 IPFERROR(130012); 620 return error; 621 } 622 # endif 623 #endif 624 SPL_X(s); 625 626 #if (__NetBSD_Version__ >= 499005500) 627 for (i = 0; i < IPL_LOGSIZE; i++) 628 seldestroy(&ipfmain.ipf_selwait[i]); 629 #endif 630 631 ipf_fini_all(softc); 632 633 return 0; 634 } 635 636 637 /* 638 * Filter ioctl interface. 639 */ 640 int 641 ipfioctl(dev_t dev, u_long cmd, 642 #if (__NetBSD_Version__ >= 499001000) 643 void *data, 644 #else 645 caddr_t data, 646 #endif 647 int mode 648 #if (NetBSD >= 199511) 649 # if (__NetBSD_Version__ >= 399001400) 650 , struct lwp *p 651 # if (__NetBSD_Version__ >= 399002000) 652 # define UID(l) kauth_cred_getuid((l)->l_cred) 653 # else 654 # define UID(l) ((l)->l_proc->p_cred->p_ruid) 655 # endif 656 # else 657 , struct proc *p 658 # define UID(p) ((p)->p_cred->p_ruid) 659 # endif 660 #endif 661 ) 662 { 663 int error = 0, unit = 0; 664 SPL_INT(s); 665 666 #if (__NetBSD_Version__ >= 399002000) 667 if ((mode & FWRITE) && 668 kauth_authorize_network(p->l_cred, KAUTH_NETWORK_FIREWALL, 669 KAUTH_REQ_NETWORK_FIREWALL_FW, NULL, 670 NULL, NULL)) { 671 ipfmain.ipf_interror = 130005; 672 return EPERM; 673 } 674 #else 675 if ((securelevel >= 2) && (mode & FWRITE)) { 676 ipfmain.ipf_interror = 130001; 677 return EPERM; 678 } 679 #endif 680 681 unit = GET_MINOR(dev); 682 if ((IPL_LOGMAX < unit) || (unit < 0)) { 683 ipfmain.ipf_interror = 130002; 684 return ENXIO; 685 } 686 687 if (ipfmain.ipf_running <= 0) { 688 if (unit != IPL_LOGIPF && cmd != SIOCIPFINTERROR) { 689 ipfmain.ipf_interror = 130003; 690 return EIO; 691 } 692 if (cmd != SIOCIPFGETNEXT && cmd != SIOCIPFGET && 693 cmd != SIOCIPFSET && cmd != SIOCFRENB && 694 cmd != SIOCGETFS && cmd != SIOCGETFF && 695 cmd != SIOCIPFINTERROR) { 696 ipfmain.ipf_interror = 130004; 697 return EIO; 698 } 699 } 700 701 SPL_NET(s); 702 703 error = ipf_ioctlswitch(&ipfmain, unit, data, cmd, mode, UID(p), p); 704 if (error != -1) { 705 SPL_X(s); 706 return error; 707 } 708 709 SPL_X(s); 710 return error; 711 } 712 713 714 /* 715 * ipf_send_reset - this could conceivably be a call to tcp_respond(), but that 716 * requires a large amount of setting up and isn't any more efficient. 717 */ 718 int 719 ipf_send_reset(fr_info_t *fin) 720 { 721 struct tcphdr *tcp, *tcp2; 722 int tlen = 0, hlen; 723 struct mbuf *m; 724 #ifdef USE_INET6 725 ip6_t *ip6; 726 #endif 727 ip_t *ip; 728 729 tcp = fin->fin_dp; 730 if (tcp->th_flags & TH_RST) 731 return -1; /* feedback loop */ 732 733 if (ipf_checkl4sum(fin) == -1) 734 return -1; 735 736 tlen = fin->fin_dlen - (TCP_OFF(tcp) << 2) + 737 ((tcp->th_flags & TH_SYN) ? 1 : 0) + 738 ((tcp->th_flags & TH_FIN) ? 1 : 0); 739 740 #ifdef USE_INET6 741 hlen = (fin->fin_v == 6) ? sizeof(ip6_t) : sizeof(ip_t); 742 #else 743 hlen = sizeof(ip_t); 744 #endif 745 #ifdef MGETHDR 746 MGETHDR(m, M_DONTWAIT, MT_HEADER); 747 #else 748 MGET(m, M_DONTWAIT, MT_HEADER); 749 #endif 750 if (m == NULL) 751 return -1; 752 if (sizeof(*tcp2) + hlen > MHLEN) { 753 MCLGET(m, M_DONTWAIT); 754 if (m == NULL) 755 return -1; 756 if ((m->m_flags & M_EXT) == 0) { 757 FREE_MB_T(m); 758 return -1; 759 } 760 } 761 762 m->m_len = sizeof(*tcp2) + hlen; 763 m->m_data += max_linkhdr; 764 m->m_pkthdr.len = m->m_len; 765 m_reset_rcvif(m); 766 ip = mtod(m, struct ip *); 767 bzero((char *)ip, hlen); 768 #ifdef USE_INET6 769 ip6 = (ip6_t *)ip; 770 #endif 771 bzero((char *)ip, sizeof(*tcp2) + hlen); 772 tcp2 = (struct tcphdr *)((char *)ip + hlen); 773 tcp2->th_sport = tcp->th_dport; 774 tcp2->th_dport = tcp->th_sport; 775 776 if (tcp->th_flags & TH_ACK) { 777 tcp2->th_seq = tcp->th_ack; 778 tcp2->th_flags = TH_RST; 779 tcp2->th_ack = 0; 780 } else { 781 tcp2->th_seq = 0; 782 tcp2->th_ack = ntohl(tcp->th_seq); 783 tcp2->th_ack += tlen; 784 tcp2->th_ack = htonl(tcp2->th_ack); 785 tcp2->th_flags = TH_RST|TH_ACK; 786 } 787 tcp2->th_x2 = 0; 788 TCP_OFF_A(tcp2, sizeof(*tcp2) >> 2); 789 tcp2->th_win = tcp->th_win; 790 tcp2->th_sum = 0; 791 tcp2->th_urp = 0; 792 793 #ifdef USE_INET6 794 if (fin->fin_v == 6) { 795 ip6->ip6_flow = ((ip6_t *)fin->fin_ip)->ip6_flow; 796 ip6->ip6_plen = htons(sizeof(struct tcphdr)); 797 ip6->ip6_nxt = IPPROTO_TCP; 798 ip6->ip6_hlim = 0; 799 ip6->ip6_src = fin->fin_dst6.in6; 800 ip6->ip6_dst = fin->fin_src6.in6; 801 tcp2->th_sum = in6_cksum(m, IPPROTO_TCP, 802 sizeof(*ip6), sizeof(*tcp2)); 803 return ipf_send_ip(fin, m); 804 } 805 #endif 806 #ifdef INET 807 ip->ip_p = IPPROTO_TCP; 808 ip->ip_len = htons(sizeof(struct tcphdr)); 809 ip->ip_src.s_addr = fin->fin_daddr; 810 ip->ip_dst.s_addr = fin->fin_saddr; 811 tcp2->th_sum = in_cksum(m, hlen + sizeof(*tcp2)); 812 ip->ip_len = hlen + sizeof(*tcp2); 813 return ipf_send_ip(fin, m); 814 #else 815 return 0; 816 #endif 817 } 818 819 820 /* 821 * Expects ip_len to be in host byte order when called. 822 */ 823 static int 824 ipf_send_ip(fr_info_t *fin, mb_t *m) 825 { 826 fr_info_t fnew; 827 #ifdef INET 828 ip_t *oip; 829 #endif 830 ip_t *ip; 831 int hlen; 832 833 ip = mtod(m, ip_t *); 834 bzero((char *)&fnew, sizeof(fnew)); 835 fnew.fin_main_soft = fin->fin_main_soft; 836 837 IP_V_A(ip, fin->fin_v); 838 switch (fin->fin_v) 839 { 840 #ifdef INET 841 case 4 : 842 oip = fin->fin_ip; 843 hlen = sizeof(*oip); 844 fnew.fin_v = 4; 845 fnew.fin_p = ip->ip_p; 846 fnew.fin_plen = ntohs(ip->ip_len); 847 HTONS(ip->ip_len); 848 IP_HL_A(ip, sizeof(*oip) >> 2); 849 ip->ip_tos = oip->ip_tos; 850 ip->ip_id = ipf_nextipid(fin); 851 ip->ip_off = htons(ip_mtudisc ? IP_DF : 0); 852 ip->ip_ttl = ip_defttl; 853 ip->ip_sum = 0; 854 break; 855 #endif 856 #ifdef USE_INET6 857 case 6 : 858 { 859 ip6_t *ip6 = (ip6_t *)ip; 860 861 ip6->ip6_vfc = 0x60; 862 ip6->ip6_hlim = IPDEFTTL; 863 864 hlen = sizeof(*ip6); 865 fnew.fin_p = ip6->ip6_nxt; 866 fnew.fin_v = 6; 867 fnew.fin_plen = ntohs(ip6->ip6_plen) + hlen; 868 break; 869 } 870 #endif 871 default : 872 return EINVAL; 873 } 874 #ifdef KAME_IPSEC 875 m_reset_rcvif(m); 876 #endif 877 878 fnew.fin_ifp = fin->fin_ifp; 879 fnew.fin_flx = FI_NOCKSUM; 880 fnew.fin_m = m; 881 fnew.fin_ip = ip; 882 fnew.fin_mp = &m; 883 fnew.fin_hlen = hlen; 884 fnew.fin_dp = (char *)ip + hlen; 885 (void) ipf_makefrip(hlen, ip, &fnew); 886 887 return ipf_fastroute(m, &m, &fnew, NULL); 888 } 889 890 891 int 892 ipf_send_icmp_err(int type, fr_info_t *fin, int dst) 893 { 894 int err, hlen, xtra, iclen, ohlen, avail; 895 struct in_addr dst4; 896 struct icmp *icmp; 897 struct mbuf *m; 898 i6addr_t dst6; 899 void *ifp; 900 #ifdef USE_INET6 901 int code; 902 ip6_t *ip6; 903 #endif 904 ip_t *ip, *ip2; 905 906 if ((type < 0) || (type > ICMP_MAXTYPE)) 907 return -1; 908 909 #ifdef USE_INET6 910 code = fin->fin_icode; 911 if ((code < 0) || (code >= sizeof(icmptoicmp6unreach)/sizeof(int))) 912 return -1; 913 #endif 914 915 if (ipf_checkl4sum(fin) == -1) 916 return -1; 917 #ifdef MGETHDR 918 MGETHDR(m, M_DONTWAIT, MT_HEADER); 919 #else 920 MGET(m, M_DONTWAIT, MT_HEADER); 921 #endif 922 if (m == NULL) 923 return -1; 924 avail = MHLEN; 925 926 xtra = 0; 927 hlen = 0; 928 ohlen = 0; 929 dst4.s_addr = 0; 930 ifp = fin->fin_ifp; 931 if (fin->fin_v == 4) { 932 if ((fin->fin_p == IPPROTO_ICMP) && !(fin->fin_flx & FI_SHORT)) 933 switch (ntohs(fin->fin_data[0]) >> 8) 934 { 935 case ICMP_ECHO : 936 case ICMP_TSTAMP : 937 case ICMP_IREQ : 938 case ICMP_MASKREQ : 939 break; 940 default : 941 FREE_MB_T(m); 942 return 0; 943 } 944 945 if (dst == 0) { 946 if (ipf_ifpaddr(&ipfmain, 4, FRI_NORMAL, ifp, 947 &dst6, NULL) == -1) { 948 FREE_MB_T(m); 949 return -1; 950 } 951 dst4 = dst6.in4; 952 } else 953 dst4.s_addr = fin->fin_daddr; 954 955 hlen = sizeof(ip_t); 956 ohlen = fin->fin_hlen; 957 iclen = hlen + offsetof(struct icmp, icmp_ip) + ohlen; 958 if (fin->fin_hlen < fin->fin_plen) 959 xtra = MIN(fin->fin_dlen, 8); 960 else 961 xtra = 0; 962 } 963 964 #ifdef USE_INET6 965 else if (fin->fin_v == 6) { 966 hlen = sizeof(ip6_t); 967 ohlen = sizeof(ip6_t); 968 iclen = hlen + offsetof(struct icmp, icmp_ip) + ohlen; 969 type = icmptoicmp6types[type]; 970 if (type == ICMP6_DST_UNREACH) 971 code = icmptoicmp6unreach[code]; 972 973 if (iclen + max_linkhdr + fin->fin_plen > avail) { 974 MCLGET(m, M_DONTWAIT); 975 if (m == NULL) 976 return -1; 977 if ((m->m_flags & M_EXT) == 0) { 978 FREE_MB_T(m); 979 return -1; 980 } 981 avail = MCLBYTES; 982 } 983 xtra = MIN(fin->fin_plen, avail - iclen - max_linkhdr); 984 xtra = MIN(xtra, IPV6_MMTU - iclen); 985 if (dst == 0) { 986 if (ipf_ifpaddr(&ipfmain, 6, FRI_NORMAL, ifp, 987 &dst6, NULL) == -1) { 988 FREE_MB_T(m); 989 return -1; 990 } 991 } else 992 dst6 = fin->fin_dst6; 993 } 994 #endif 995 else { 996 FREE_MB_T(m); 997 return -1; 998 } 999 1000 avail -= (max_linkhdr + iclen); 1001 if (avail < 0) { 1002 FREE_MB_T(m); 1003 return -1; 1004 } 1005 if (xtra > avail) 1006 xtra = avail; 1007 iclen += xtra; 1008 m->m_data += max_linkhdr; 1009 m_reset_rcvif(m); 1010 m->m_pkthdr.len = iclen; 1011 m->m_len = iclen; 1012 ip = mtod(m, ip_t *); 1013 icmp = (struct icmp *)((char *)ip + hlen); 1014 ip2 = (ip_t *)&icmp->icmp_ip; 1015 1016 icmp->icmp_type = type; 1017 icmp->icmp_code = fin->fin_icode; 1018 icmp->icmp_cksum = 0; 1019 #ifdef icmp_nextmtu 1020 if (type == ICMP_UNREACH && fin->fin_icode == ICMP_UNREACH_NEEDFRAG) { 1021 if (fin->fin_mtu != 0) { 1022 icmp->icmp_nextmtu = htons(fin->fin_mtu); 1023 1024 } else if (ifp != NULL) { 1025 icmp->icmp_nextmtu = htons(GETIFMTU_4(ifp)); 1026 1027 } else { /* make up a number... */ 1028 icmp->icmp_nextmtu = htons(fin->fin_plen - 20); 1029 } 1030 } 1031 #endif 1032 1033 bcopy((char *)fin->fin_ip, (char *)ip2, ohlen); 1034 1035 #if defined(M_CSUM_IPv4) 1036 /* 1037 * Clear any in-bound checksum flags for this packet. 1038 */ 1039 m->m_pkthdr.csuminfo = 0; 1040 #endif /* __NetBSD__ && M_CSUM_IPv4 */ 1041 1042 #ifdef USE_INET6 1043 ip6 = (ip6_t *)ip; 1044 if (fin->fin_v == 6) { 1045 ip6->ip6_flow = ((ip6_t *)fin->fin_ip)->ip6_flow; 1046 ip6->ip6_plen = htons(iclen - hlen); 1047 ip6->ip6_nxt = IPPROTO_ICMPV6; 1048 ip6->ip6_hlim = 0; 1049 ip6->ip6_src = dst6.in6; 1050 ip6->ip6_dst = fin->fin_src6.in6; 1051 if (xtra > 0) 1052 bcopy((char *)fin->fin_ip + ohlen, 1053 (char *)&icmp->icmp_ip + ohlen, xtra); 1054 icmp->icmp_cksum = in6_cksum(m, IPPROTO_ICMPV6, 1055 sizeof(*ip6), iclen - hlen); 1056 } else 1057 #endif 1058 { 1059 ip->ip_p = IPPROTO_ICMP; 1060 ip->ip_src.s_addr = dst4.s_addr; 1061 ip->ip_dst.s_addr = fin->fin_saddr; 1062 1063 if (xtra > 0) 1064 bcopy((char *)fin->fin_ip + ohlen, 1065 (char *)&icmp->icmp_ip + ohlen, xtra); 1066 icmp->icmp_cksum = ipf_cksum((u_short *)icmp, 1067 sizeof(*icmp) + 8); 1068 ip->ip_len = iclen; 1069 ip->ip_p = IPPROTO_ICMP; 1070 } 1071 err = ipf_send_ip(fin, m); 1072 return err; 1073 } 1074 1075 1076 /* 1077 * m0 - pointer to mbuf where the IP packet starts 1078 * mpp - pointer to the mbuf pointer that is the start of the mbuf chain 1079 */ 1080 int 1081 ipf_fastroute(mb_t *m0, mb_t **mpp, fr_info_t *fin, frdest_t *fdp) 1082 { 1083 register struct ip *ip, *mhip; 1084 register struct mbuf *m = *mpp; 1085 register struct route *ro; 1086 int len, off, error = 0, hlen, code; 1087 struct ifnet *ifp, *sifp; 1088 ipf_main_softc_t *softc; 1089 #if __NetBSD_Version__ >= 499001100 1090 union { 1091 struct sockaddr dst; 1092 struct sockaddr_in dst4; 1093 } u; 1094 #else 1095 struct sockaddr_in *dst4; 1096 #endif 1097 struct sockaddr *dst; 1098 u_short ip_off, ip_len; 1099 struct route iproute; 1100 struct rtentry *rt; 1101 frdest_t node; 1102 frentry_t *fr; 1103 1104 if (fin->fin_v == 6) { 1105 #ifdef USE_INET6 1106 error = ipf_fastroute6(m0, mpp, fin, fdp); 1107 #else 1108 error = EPROTONOSUPPORT; 1109 #endif 1110 if ((error != 0) && (*mpp != NULL)) 1111 FREE_MB_T(*mpp); 1112 return error; 1113 } 1114 #ifndef INET 1115 FREE_MB_T(*mpp); 1116 return EPROTONOSUPPORT; 1117 #else 1118 1119 hlen = fin->fin_hlen; 1120 ip = mtod(m0, struct ip *); 1121 softc = fin->fin_main_soft; 1122 rt = NULL; 1123 ifp = NULL; 1124 1125 # if defined(M_CSUM_IPv4) 1126 /* 1127 * Clear any in-bound checksum flags for this packet. 1128 */ 1129 m0->m_pkthdr.csuminfo = 0; 1130 # endif /* __NetBSD__ && M_CSUM_IPv4 */ 1131 1132 /* 1133 * Route packet. 1134 */ 1135 ro = &iproute; 1136 memset(ro, 0, sizeof(*ro)); 1137 fr = fin->fin_fr; 1138 1139 if ((fr != NULL) && !(fr->fr_flags & FR_KEEPSTATE) && (fdp != NULL) && 1140 (fdp->fd_type == FRD_DSTLIST)) { 1141 if (ipf_dstlist_select_node(fin, fdp->fd_ptr, NULL, &node) == 0) 1142 fdp = &node; 1143 } 1144 if (fdp != NULL) 1145 ifp = fdp->fd_ptr; 1146 else 1147 ifp = fin->fin_ifp; 1148 1149 if ((ifp == NULL) && ((fr == NULL) || !(fr->fr_flags & FR_FASTROUTE))) { 1150 error = -2; 1151 goto bad; 1152 } 1153 1154 # if __NetBSD_Version__ >= 499001100 1155 if ((fdp != NULL) && (fdp->fd_ip.s_addr != 0)) 1156 sockaddr_in_init(&u.dst4, &fdp->fd_ip, 0); 1157 else 1158 sockaddr_in_init(&u.dst4, &ip->ip_dst, 0); 1159 dst = &u.dst; 1160 rtcache_setdst(ro, dst); 1161 rt = rtcache_init(ro); 1162 # else 1163 dst4 = (struct sockaddr_in *)&ro->ro_dst; 1164 dst = (struct sockaddr *)dst4; 1165 dst4->sin_family = AF_INET; 1166 dst4->sin_addr = ip->ip_dst; 1167 1168 if ((fdp != NULL) && (fdp->fd_ip.s_addr != 0)) 1169 dst4->sin_addr = fdp->fd_ip; 1170 1171 dst4->sin_len = sizeof(*dst); 1172 rtalloc(ro); 1173 rt = ro->ro_rt; 1174 # endif 1175 if ((ifp == NULL) && (rt != NULL)) 1176 ifp = rt->rt_ifp; 1177 if ((rt == NULL) || (ifp == NULL)) { 1178 #ifdef INET 1179 if (in_localaddr(ip->ip_dst)) 1180 error = EHOSTUNREACH; 1181 else 1182 #endif 1183 error = ENETUNREACH; 1184 goto bad; 1185 } 1186 1187 1188 if (rt->rt_flags & RTF_GATEWAY) 1189 dst = rt->rt_gateway; 1190 1191 rt->rt_use++; 1192 1193 /* 1194 * For input packets which are being "fastrouted", they won't 1195 * go back through output filtering and miss their chance to get 1196 * NAT'd and counted. Duplicated packets aren't considered to be 1197 * part of the normal packet stream, so do not NAT them or pass 1198 * them through stateful checking, etc. 1199 */ 1200 if ((fdp != &fr->fr_dif) && (fin->fin_out == 0)) { 1201 sifp = fin->fin_ifp; 1202 fin->fin_ifp = ifp; 1203 fin->fin_out = 1; 1204 (void) ipf_acctpkt(fin, NULL); 1205 fin->fin_fr = NULL; 1206 if (!fr || !(fr->fr_flags & FR_RETMASK)) { 1207 u_32_t pass; 1208 1209 (void) ipf_state_check(fin, &pass); 1210 } 1211 1212 switch (ipf_nat_checkout(fin, NULL)) 1213 { 1214 case 0 : 1215 break; 1216 case 1 : 1217 ip->ip_sum = 0; 1218 break; 1219 case -1 : 1220 error = -1; 1221 goto bad; 1222 break; 1223 } 1224 1225 fin->fin_ifp = sifp; 1226 fin->fin_out = 0; 1227 } else 1228 ip->ip_sum = 0; 1229 /* 1230 * If small enough for interface, can just send directly. 1231 */ 1232 m_set_rcvif(m, ifp); 1233 1234 ip_len = ntohs(ip->ip_len); 1235 if (ip_len <= ifp->if_mtu) { 1236 # if defined(M_CSUM_IPv4) 1237 # if (__NetBSD_Version__ >= 105009999) 1238 if (ifp->if_csum_flags_tx & M_CSUM_IPv4) 1239 m->m_pkthdr.csuminfo |= M_CSUM_IPv4; 1240 # else 1241 if (ifp->if_capabilities & IFCAP_CSUM_IPv4) 1242 m->m_pkthdr.csuminfo |= M_CSUM_IPv4; 1243 # endif /* (__NetBSD_Version__ >= 105009999) */ 1244 else if (ip->ip_sum == 0) 1245 ip->ip_sum = in_cksum(m, hlen); 1246 # else 1247 if (!ip->ip_sum) 1248 ip->ip_sum = in_cksum(m, hlen); 1249 # endif /* M_CSUM_IPv4 */ 1250 1251 error = if_output_lock(ifp, ifp, m, dst, rt); 1252 goto done; 1253 } 1254 1255 /* 1256 * Too large for interface; fragment if possible. 1257 * Must be able to put at least 8 bytes per fragment. 1258 */ 1259 ip_off = ntohs(ip->ip_off); 1260 if (ip_off & IP_DF) { 1261 error = EMSGSIZE; 1262 goto bad; 1263 } 1264 len = (ifp->if_mtu - hlen) &~ 7; 1265 if (len < 8) { 1266 error = EMSGSIZE; 1267 goto bad; 1268 } 1269 1270 { 1271 int mhlen, firstlen = len; 1272 struct mbuf **mnext = &m->m_act; 1273 1274 /* 1275 * Loop through length of segment after first fragment, 1276 * make new header and copy data of each part and link onto chain. 1277 */ 1278 m0 = m; 1279 mhlen = sizeof (struct ip); 1280 for (off = hlen + len; off < ip_len; off += len) { 1281 # ifdef MGETHDR 1282 MGETHDR(m, M_DONTWAIT, MT_HEADER); 1283 # else 1284 MGET(m, M_DONTWAIT, MT_HEADER); 1285 # endif 1286 if (m == 0) { 1287 m = m0; 1288 error = ENOBUFS; 1289 goto bad; 1290 } 1291 m->m_data += max_linkhdr; 1292 mhip = mtod(m, struct ip *); 1293 bcopy((char *)ip, (char *)mhip, sizeof(*ip)); 1294 #ifdef INET 1295 if (hlen > sizeof (struct ip)) { 1296 mhlen = ip_optcopy(ip, mhip) + sizeof (struct ip); 1297 IP_HL_A(mhip, mhlen >> 2); 1298 } 1299 #endif 1300 m->m_len = mhlen; 1301 mhip->ip_off = ((off - hlen) >> 3) + ip_off; 1302 if (off + len >= ip_len) 1303 len = ip_len - off; 1304 else 1305 mhip->ip_off |= IP_MF; 1306 mhip->ip_len = htons((u_short)(len + mhlen)); 1307 m->m_next = m_copy(m0, off, len); 1308 if (m->m_next == 0) { 1309 error = ENOBUFS; /* ??? */ 1310 goto sendorfree; 1311 } 1312 m->m_pkthdr.len = mhlen + len; 1313 m_reset_rcvif(m); 1314 mhip->ip_off = htons((u_short)mhip->ip_off); 1315 mhip->ip_sum = 0; 1316 #ifdef INET 1317 mhip->ip_sum = in_cksum(m, mhlen); 1318 #endif 1319 *mnext = m; 1320 mnext = &m->m_act; 1321 } 1322 /* 1323 * Update first fragment by trimming what's been copied out 1324 * and updating header, then send each fragment (in order). 1325 */ 1326 m_adj(m0, hlen + firstlen - ip_len); 1327 ip->ip_len = htons((u_short)(hlen + firstlen)); 1328 ip->ip_off = htons((u_short)IP_MF); 1329 ip->ip_sum = 0; 1330 #ifdef INET 1331 ip->ip_sum = in_cksum(m0, hlen); 1332 #endif 1333 sendorfree: 1334 for (m = m0; m; m = m0) { 1335 m0 = m->m_act; 1336 m->m_act = 0; 1337 if (error == 0) { 1338 KERNEL_LOCK(1, NULL); 1339 error = (*ifp->if_output)(ifp, m, dst, rt); 1340 KERNEL_UNLOCK_ONE(NULL); 1341 } else { 1342 FREE_MB_T(m); 1343 } 1344 } 1345 } 1346 done: 1347 if (!error) 1348 softc->ipf_frouteok[0]++; 1349 else 1350 softc->ipf_frouteok[1]++; 1351 1352 # if __NetBSD_Version__ >= 499001100 1353 rtcache_unref(rt, ro); 1354 rtcache_free(ro); 1355 # else 1356 if (rt) { 1357 RTFREE(rt); 1358 } 1359 # endif 1360 return error; 1361 bad: 1362 if (error == EMSGSIZE) { 1363 sifp = fin->fin_ifp; 1364 code = fin->fin_icode; 1365 fin->fin_icode = ICMP_UNREACH_NEEDFRAG; 1366 fin->fin_ifp = ifp; 1367 (void) ipf_send_icmp_err(ICMP_UNREACH, fin, 1); 1368 fin->fin_ifp = sifp; 1369 fin->fin_icode = code; 1370 } 1371 FREE_MB_T(m); 1372 goto done; 1373 #endif /* INET */ 1374 } 1375 1376 1377 #if defined(USE_INET6) 1378 /* 1379 * This is the IPv6 specific fastroute code. It doesn't clean up the mbuf's 1380 * or ensure that it is an IPv6 packet that is being forwarded, those are 1381 * expected to be done by the called (ipf_fastroute). 1382 */ 1383 static int 1384 ipf_fastroute6(struct mbuf *m0, struct mbuf **mpp, fr_info_t *fin, 1385 frdest_t *fdp) 1386 { 1387 # if __NetBSD_Version__ >= 499001100 1388 struct route ip6route; 1389 const struct sockaddr *dst; 1390 union { 1391 struct sockaddr dst; 1392 struct sockaddr_in6 dst6; 1393 } u; 1394 struct route *ro; 1395 # else 1396 struct route_in6 ip6route; 1397 struct sockaddr_in6 *dst6; 1398 struct route_in6 *ro; 1399 # endif 1400 struct rtentry *rt; 1401 struct ifnet *ifp; 1402 u_long mtu; 1403 int error; 1404 1405 error = 0; 1406 ro = &ip6route; 1407 1408 if (fdp != NULL) 1409 ifp = fdp->fd_ptr; 1410 else 1411 ifp = fin->fin_ifp; 1412 memset(ro, 0, sizeof(*ro)); 1413 # if __NetBSD_Version__ >= 499001100 1414 if (fdp != NULL && IP6_NOTZERO(&fdp->fd_ip6)) 1415 sockaddr_in6_init(&u.dst6, &fdp->fd_ip6.in6, 0, 0, 0); 1416 else 1417 sockaddr_in6_init(&u.dst6, &fin->fin_fi.fi_dst.in6, 0, 0, 0); 1418 dst = &u.dst; 1419 rtcache_setdst(ro, dst); 1420 1421 rt = rtcache_init(ro); 1422 if ((ifp == NULL) && (rt != NULL)) 1423 ifp = rt->rt_ifp; 1424 # else 1425 dst6 = (struct sockaddr_in6 *)&ro->ro_dst; 1426 dst6->sin6_family = AF_INET6; 1427 dst6->sin6_len = sizeof(struct sockaddr_in6); 1428 dst6->sin6_addr = fin->fin_fi.fi_dst.in6; 1429 1430 if (fdp != NULL) { 1431 if (IP6_NOTZERO(&fdp->fd_ip6)) 1432 dst6->sin6_addr = fdp->fd_ip6.in6; 1433 } 1434 1435 rtalloc((struct route *)ro); 1436 1437 if ((ifp == NULL) && (ro->ro_rt != NULL)) 1438 ifp = ro->ro_rt->rt_ifp; 1439 rt = ro->ro_rt; 1440 # endif 1441 if ((rt == NULL) || (ifp == NULL)) { 1442 1443 error = EHOSTUNREACH; 1444 goto bad; 1445 } 1446 1447 /* KAME */ 1448 # if __NetBSD_Version__ >= 499001100 1449 if (IN6_IS_ADDR_LINKLOCAL(&u.dst6.sin6_addr)) 1450 u.dst6.sin6_addr.s6_addr16[1] = htons(ifp->if_index); 1451 # else 1452 if (IN6_IS_ADDR_LINKLOCAL(&dst6->sin6_addr)) 1453 dst6->sin6_addr.s6_addr16[1] = htons(ifp->if_index); 1454 # endif 1455 1456 { 1457 # if (__NetBSD_Version__ >= 106010000) && !defined(IN6_LINKMTU) 1458 struct in6_ifextra *ife; 1459 # endif 1460 if (rt->rt_flags & RTF_GATEWAY) 1461 # if __NetBSD_Version__ >= 499001100 1462 dst = rt->rt_gateway; 1463 # else 1464 dst6 = (struct sockaddr_in6 *)rt->rt_gateway; 1465 # endif 1466 rt->rt_use++; 1467 1468 /* Determine path MTU. */ 1469 # if (__NetBSD_Version__ <= 106009999) 1470 mtu = nd_ifinfo[ifp->if_index].linkmtu; 1471 # else 1472 # ifdef IN6_LINKMTU 1473 mtu = IN6_LINKMTU(ifp); 1474 # else 1475 ife = (struct in6_ifextra *)(ifp)->if_afdata[AF_INET6]; 1476 mtu = ife->nd_ifinfo[ifp->if_index].linkmtu; 1477 # endif 1478 # endif 1479 if ((error == 0) && (m0->m_pkthdr.len <= mtu)) { 1480 # if __NetBSD_Version__ >= 499001100 1481 error = nd6_output(ifp, ifp, m0, satocsin6(dst), rt); 1482 # else 1483 error = nd6_output(ifp, ifp, m0, dst6, rt); 1484 # endif 1485 } else { 1486 error = EMSGSIZE; 1487 } 1488 } 1489 bad: 1490 # if __NetBSD_Version__ >= 499001100 1491 rtcache_unref(rt, ro); 1492 rtcache_free(ro); 1493 # else 1494 if (ro->ro_rt != NULL) { 1495 RTFREE(((struct route *)ro)->ro_rt); 1496 } 1497 # endif 1498 return error; 1499 } 1500 #endif /* INET6 */ 1501 1502 1503 int 1504 ipf_verifysrc(fr_info_t *fin) 1505 { 1506 #if __NetBSD_Version__ >= 499001100 1507 union { 1508 struct sockaddr dst; 1509 struct sockaddr_in dst4; 1510 } u; 1511 struct rtentry *rt; 1512 #else 1513 struct sockaddr_in *dst; 1514 #endif 1515 struct route iproute; 1516 int rc; 1517 1518 #if __NetBSD_Version__ >= 499001100 1519 sockaddr_in_init(&u.dst4, &fin->fin_src, 0); 1520 rtcache_setdst(&iproute, &u.dst); 1521 rt = rtcache_init(&iproute); 1522 if (rt == NULL) 1523 rc = 0; 1524 else 1525 rc = (fin->fin_ifp == rt->rt_ifp); 1526 rtcache_unref(rt, &iproute); 1527 rtcache_free(&iproute); 1528 #else 1529 dst = (struct sockaddr_in *)&iproute.ro_dst; 1530 dst->sin_len = sizeof(*dst); 1531 dst->sin_family = AF_INET; 1532 dst->sin_addr = fin->fin_src; 1533 rtalloc(&iproute); 1534 if (iproute.ro_rt == NULL) 1535 return 0; 1536 rc = (fin->fin_ifp == iproute.ro_rt->rt_ifp); 1537 RTFREE(iproute.ro_rt); 1538 #endif 1539 return rc; 1540 } 1541 1542 1543 /* 1544 * return the first IP Address associated with an interface 1545 */ 1546 int 1547 ipf_ifpaddr(ipf_main_softc_t *softc, int v, int atype, void *ifptr, 1548 i6addr_t *inp, i6addr_t *inpmask) 1549 { 1550 #ifdef USE_INET6 1551 struct in6_addr *inp6 = NULL; 1552 #endif 1553 struct sockaddr *sock, *mask; 1554 struct sockaddr_in *sin; 1555 struct ifaddr *ifa; 1556 struct ifnet *ifp; 1557 1558 if ((ifptr == NULL) || (ifptr == (void *)-1)) 1559 return -1; 1560 1561 ifp = ifptr; 1562 mask = NULL; 1563 1564 if (v == 4) 1565 inp->in4.s_addr = 0; 1566 #ifdef USE_INET6 1567 else if (v == 6) 1568 bzero((char *)inp, sizeof(*inp)); 1569 #endif 1570 1571 ifa = IFADDR_READER_FIRST(ifp); 1572 sock = ifa ? ifa->ifa_addr : NULL; 1573 while (sock != NULL && ifa != NULL) { 1574 sin = (struct sockaddr_in *)sock; 1575 if ((v == 4) && (sin->sin_family == AF_INET)) 1576 break; 1577 #ifdef USE_INET6 1578 if ((v == 6) && (sin->sin_family == AF_INET6)) { 1579 inp6 = &((struct sockaddr_in6 *)sin)->sin6_addr; 1580 if (!IN6_IS_ADDR_LINKLOCAL(inp6) && 1581 !IN6_IS_ADDR_LOOPBACK(inp6)) 1582 break; 1583 } 1584 #endif 1585 ifa = IFADDR_READER_NEXT(ifa); 1586 if (ifa != NULL) 1587 sock = ifa->ifa_addr; 1588 } 1589 if (ifa == NULL || sock == NULL) 1590 return -1; 1591 1592 mask = ifa->ifa_netmask; 1593 if (atype == FRI_BROADCAST) 1594 sock = ifa->ifa_broadaddr; 1595 else if (atype == FRI_PEERADDR) 1596 sock = ifa->ifa_dstaddr; 1597 1598 #ifdef USE_INET6 1599 if (v == 6) 1600 return ipf_ifpfillv6addr(atype, (struct sockaddr_in6 *)sock, 1601 (struct sockaddr_in6 *)mask, 1602 inp, inpmask); 1603 #endif 1604 return ipf_ifpfillv4addr(atype, (struct sockaddr_in *)sock, 1605 (struct sockaddr_in *)mask, 1606 &inp->in4, &inpmask->in4); 1607 } 1608 1609 1610 u_32_t 1611 ipf_newisn(fr_info_t *fin) 1612 { 1613 #if __NetBSD_Version__ >= 105190000 /* 1.5T */ 1614 size_t asz; 1615 1616 if (fin->fin_v == 4) 1617 asz = sizeof(struct in_addr); 1618 else if (fin->fin_v == 6) 1619 asz = sizeof(fin->fin_src); 1620 else /* XXX: no way to return error */ 1621 return 0; 1622 #ifdef INET 1623 return tcp_new_iss1((void *)&fin->fin_src, (void *)&fin->fin_dst, 1624 fin->fin_sport, fin->fin_dport, asz, 0); 1625 #else 1626 return ENOSYS; 1627 #endif 1628 #else 1629 static int iss_seq_off = 0; 1630 u_char hash[16]; 1631 u_32_t newiss; 1632 MD5_CTX ctx; 1633 1634 /* 1635 * Compute the base value of the ISS. It is a hash 1636 * of (saddr, sport, daddr, dport, secret). 1637 */ 1638 MD5Init(&ctx); 1639 1640 MD5Update(&ctx, (u_char *) &fin->fin_fi.fi_src, 1641 sizeof(fin->fin_fi.fi_src)); 1642 MD5Update(&ctx, (u_char *) &fin->fin_fi.fi_dst, 1643 sizeof(fin->fin_fi.fi_dst)); 1644 MD5Update(&ctx, (u_char *) &fin->fin_dat, sizeof(fin->fin_dat)); 1645 1646 MD5Update(&ctx, ipf_iss_secret, sizeof(ipf_iss_secret)); 1647 1648 MD5Final(hash, &ctx); 1649 1650 memcpy(&newiss, hash, sizeof(newiss)); 1651 1652 /* 1653 * Now increment our "timer", and add it in to 1654 * the computed value. 1655 * 1656 * XXX Use `addin'? 1657 * XXX TCP_ISSINCR too large to use? 1658 */ 1659 iss_seq_off += 0x00010000; 1660 newiss += iss_seq_off; 1661 return newiss; 1662 #endif 1663 } 1664 1665 1666 /* ------------------------------------------------------------------------ */ 1667 /* Function: ipf_nextipid */ 1668 /* Returns: int - 0 == success, -1 == error (packet should be droppped) */ 1669 /* Parameters: fin(I) - pointer to packet information */ 1670 /* */ 1671 /* Returns the next IPv4 ID to use for this packet. */ 1672 /* ------------------------------------------------------------------------ */ 1673 u_short 1674 ipf_nextipid(fr_info_t *fin) 1675 { 1676 #ifdef USE_MUTEXES 1677 ipf_main_softc_t *softc = fin->fin_main_soft; 1678 #endif 1679 u_short id; 1680 1681 MUTEX_ENTER(&softc->ipf_rw); 1682 id = ipid++; 1683 MUTEX_EXIT(&softc->ipf_rw); 1684 1685 return id; 1686 } 1687 1688 1689 EXTERN_INLINE int 1690 ipf_checkv4sum(fr_info_t *fin) 1691 { 1692 #ifdef M_CSUM_TCP_UDP_BAD 1693 int manual, pflag, cflags, active; 1694 mb_t *m; 1695 1696 if ((fin->fin_flx & FI_NOCKSUM) != 0) 1697 return 0; 1698 1699 if ((fin->fin_flx & FI_SHORT) != 0) 1700 return 1; 1701 1702 if (fin->fin_cksum != FI_CK_NEEDED) 1703 return (fin->fin_cksum > FI_CK_NEEDED) ? 0 : -1; 1704 1705 manual = 0; 1706 m = fin->fin_m; 1707 if (m == NULL) { 1708 manual = 1; 1709 goto skipauto; 1710 } 1711 1712 switch (fin->fin_p) 1713 { 1714 case IPPROTO_UDP : 1715 pflag = M_CSUM_UDPv4; 1716 break; 1717 case IPPROTO_TCP : 1718 pflag = M_CSUM_TCPv4; 1719 break; 1720 default : 1721 pflag = 0; 1722 manual = 1; 1723 break; 1724 } 1725 1726 active = ((struct ifnet *)fin->fin_ifp)->if_csum_flags_rx & pflag; 1727 active |= M_CSUM_TCP_UDP_BAD | M_CSUM_DATA; 1728 cflags = m->m_pkthdr.csum_flags & active; 1729 1730 if (pflag != 0) { 1731 if (cflags == (pflag | M_CSUM_TCP_UDP_BAD)) { 1732 fin->fin_flx |= FI_BAD; 1733 fin->fin_cksum = FI_CK_BAD; 1734 } else if (cflags == (pflag | M_CSUM_DATA)) { 1735 if ((m->m_pkthdr.csum_data ^ 0xffff) != 0) { 1736 fin->fin_flx |= FI_BAD; 1737 fin->fin_cksum = FI_CK_BAD; 1738 } else { 1739 fin->fin_cksum = FI_CK_SUMOK; 1740 } 1741 } else if (cflags == pflag) { 1742 fin->fin_cksum = FI_CK_SUMOK; 1743 } else { 1744 manual = 1; 1745 } 1746 } 1747 skipauto: 1748 if (manual != 0) { 1749 if (ipf_checkl4sum(fin) == -1) { 1750 fin->fin_flx |= FI_BAD; 1751 return -1; 1752 } 1753 } 1754 #else 1755 if (ipf_checkl4sum(fin) == -1) { 1756 fin->fin_flx |= FI_BAD; 1757 return -1; 1758 } 1759 #endif 1760 return 0; 1761 } 1762 1763 1764 #ifdef USE_INET6 1765 EXTERN_INLINE int 1766 ipf_checkv6sum(fr_info_t *fin) 1767 { 1768 # ifdef M_CSUM_TCP_UDP_BAD 1769 int manual, pflag, cflags, active; 1770 mb_t *m; 1771 1772 if ((fin->fin_flx & FI_NOCKSUM) != 0) 1773 return 0; 1774 1775 if ((fin->fin_flx & FI_SHORT) != 0) 1776 return 1; 1777 1778 if (fin->fin_cksum != FI_CK_SUMOK) 1779 return (fin->fin_cksum > FI_CK_NEEDED) ? 0 : -1; 1780 1781 1782 manual = 0; 1783 m = fin->fin_m; 1784 1785 switch (fin->fin_p) 1786 { 1787 case IPPROTO_UDP : 1788 pflag = M_CSUM_UDPv6; 1789 break; 1790 case IPPROTO_TCP : 1791 pflag = M_CSUM_TCPv6; 1792 break; 1793 default : 1794 pflag = 0; 1795 manual = 1; 1796 break; 1797 } 1798 1799 active = ((struct ifnet *)fin->fin_ifp)->if_csum_flags_rx & pflag; 1800 active |= M_CSUM_TCP_UDP_BAD | M_CSUM_DATA; 1801 cflags = m->m_pkthdr.csum_flags & active; 1802 1803 if (pflag != 0) { 1804 if (cflags == (pflag | M_CSUM_TCP_UDP_BAD)) { 1805 fin->fin_flx |= FI_BAD; 1806 } else if (cflags == (pflag | M_CSUM_DATA)) { 1807 if ((m->m_pkthdr.csum_data ^ 0xffff) != 0) 1808 fin->fin_flx |= FI_BAD; 1809 } else if (cflags == pflag) { 1810 ; 1811 } else { 1812 manual = 1; 1813 } 1814 } 1815 if (manual != 0) { 1816 if (ipf_checkl4sum(fin) == -1) { 1817 fin->fin_flx |= FI_BAD; 1818 return -1; 1819 } 1820 } 1821 # else 1822 if (ipf_checkl4sum(fin) == -1) { 1823 fin->fin_flx |= FI_BAD; 1824 return -1; 1825 } 1826 # endif 1827 return 0; 1828 } 1829 #endif /* USE_INET6 */ 1830 1831 1832 size_t 1833 mbufchainlen(struct mbuf *m0) 1834 { 1835 size_t len; 1836 1837 if ((m0->m_flags & M_PKTHDR) != 0) { 1838 len = m0->m_pkthdr.len; 1839 } else { 1840 struct mbuf *m; 1841 1842 for (m = m0, len = 0; m != NULL; m = m->m_next) 1843 len += m->m_len; 1844 } 1845 return len; 1846 } 1847 1848 1849 /* ------------------------------------------------------------------------ */ 1850 /* Function: ipf_pullup */ 1851 /* Returns: NULL == pullup failed, else pointer to protocol header */ 1852 /* Parameters: xmin(I)- pointer to buffer where data packet starts */ 1853 /* fin(I) - pointer to packet information */ 1854 /* len(I) - number of bytes to pullup */ 1855 /* */ 1856 /* Attempt to move at least len bytes (from the start of the buffer) into a */ 1857 /* single buffer for ease of access. Operating system native functions are */ 1858 /* used to manage buffers - if necessary. If the entire packet ends up in */ 1859 /* a single buffer, set the FI_COALESCE flag even though ipf_coalesce() has */ 1860 /* not been called. Both fin_ip and fin_dp are updated before exiting _IF_ */ 1861 /* and ONLY if the pullup succeeds. */ 1862 /* */ 1863 /* We assume that 'xmin' is a pointer to a buffer that is part of the chain */ 1864 /* of buffers that starts at *fin->fin_mp. */ 1865 /* ------------------------------------------------------------------------ */ 1866 void * 1867 ipf_pullup(mb_t *xmin, fr_info_t *fin, int len) 1868 { 1869 int dpoff, ipoff; 1870 mb_t *m = xmin; 1871 char *ip; 1872 1873 if (m == NULL) 1874 return NULL; 1875 1876 ip = (char *)fin->fin_ip; 1877 if ((fin->fin_flx & FI_COALESCE) != 0) 1878 return ip; 1879 1880 ipoff = fin->fin_ipoff; 1881 if (fin->fin_dp != NULL) 1882 dpoff = (char *)fin->fin_dp - (char *)ip; 1883 else 1884 dpoff = 0; 1885 1886 if (M_LEN(m) < len) { 1887 mb_t *n = *fin->fin_mp; 1888 /* 1889 * Assume that M_PKTHDR is set and just work with what is left 1890 * rather than check.. 1891 * Should not make any real difference, anyway. 1892 */ 1893 if (m != n) { 1894 /* 1895 * Record the mbuf that points to the mbuf that we're 1896 * about to go to work on so that we can update the 1897 * m_next appropriately later. 1898 */ 1899 for (; n->m_next != m; n = n->m_next) 1900 ; 1901 } else { 1902 n = NULL; 1903 } 1904 1905 #ifdef MHLEN 1906 if (len > MHLEN) 1907 #else 1908 if (len > MLEN) 1909 #endif 1910 { 1911 #ifdef HAVE_M_PULLDOWN 1912 if (m_pulldown(m, 0, len, NULL) == NULL) 1913 m = NULL; 1914 #else 1915 FREE_MB_T(*fin->fin_mp); 1916 m = NULL; 1917 n = NULL; 1918 #endif 1919 } else 1920 { 1921 m = m_pullup(m, len); 1922 } 1923 if (n != NULL) 1924 n->m_next = m; 1925 if (m == NULL) { 1926 /* 1927 * When n is non-NULL, it indicates that m pointed to 1928 * a sub-chain (tail) of the mbuf and that the head 1929 * of this chain has not yet been free'd. 1930 */ 1931 if (n != NULL) { 1932 FREE_MB_T(*fin->fin_mp); 1933 } 1934 1935 *fin->fin_mp = NULL; 1936 fin->fin_m = NULL; 1937 return NULL; 1938 } 1939 1940 if (n == NULL) 1941 *fin->fin_mp = m; 1942 1943 while (M_LEN(m) == 0) { 1944 m = m->m_next; 1945 } 1946 fin->fin_m = m; 1947 ip = MTOD(m, char *) + ipoff; 1948 1949 fin->fin_ip = (ip_t *)ip; 1950 if (fin->fin_dp != NULL) 1951 fin->fin_dp = (char *)fin->fin_ip + dpoff; 1952 if (fin->fin_fraghdr != NULL) 1953 fin->fin_fraghdr = (char *)ip + 1954 ((char *)fin->fin_fraghdr - 1955 (char *)fin->fin_ip); 1956 } 1957 1958 if (len == fin->fin_plen) 1959 fin->fin_flx |= FI_COALESCE; 1960 return ip; 1961 } 1962 1963 1964 int 1965 ipf_inject(fr_info_t *fin, mb_t *m) 1966 { 1967 int error; 1968 1969 if (fin->fin_out == 0) { 1970 if (__predict_false(!pktq_enqueue(ip_pktq, m, 0))) { 1971 FREE_MB_T(m); 1972 error = ENOBUFS; 1973 } else { 1974 error = 0; 1975 } 1976 } else { 1977 error = ip_output(m, NULL, NULL, IP_FORWARDING, NULL, NULL); 1978 } 1979 return error; 1980 } 1981 1982 1983 u_32_t 1984 ipf_random(void) 1985 { 1986 int number; 1987 1988 #ifdef _CPRNG_H 1989 number = cprng_fast32(); 1990 #else 1991 number = arc4random(); 1992 #endif 1993 return number; 1994 } 1995 1996 1997 /* 1998 * routines below for saving IP headers to buffer 1999 */ 2000 static int ipfopen(dev_t dev, int flags 2001 #if (NetBSD >= 199511) 2002 , int devtype, PROC_T *p 2003 #endif 2004 ) 2005 { 2006 u_int unit = GET_MINOR(dev); 2007 int error; 2008 2009 if (IPL_LOGMAX < unit) { 2010 error = ENXIO; 2011 } else { 2012 switch (unit) 2013 { 2014 case IPL_LOGIPF : 2015 case IPL_LOGNAT : 2016 case IPL_LOGSTATE : 2017 case IPL_LOGAUTH : 2018 case IPL_LOGLOOKUP : 2019 case IPL_LOGSYNC : 2020 #ifdef IPFILTER_SCAN 2021 case IPL_LOGSCAN : 2022 #endif 2023 error = 0; 2024 break; 2025 default : 2026 error = ENXIO; 2027 break; 2028 } 2029 } 2030 #if (__NetBSD_Version__ >= 799003000) 2031 if (error == 0) { 2032 mutex_enter(&ipf_ref_mutex); 2033 ipf_active = 1; 2034 mutex_exit(&ipf_ref_mutex); 2035 } 2036 #endif 2037 return error; 2038 } 2039 2040 2041 static int ipfclose(dev_t dev, int flags 2042 #if (NetBSD >= 199511) 2043 , int devtype, PROC_T *p 2044 #endif 2045 ) 2046 { 2047 u_int unit = GET_MINOR(dev); 2048 2049 if (IPL_LOGMAX < unit) 2050 return ENXIO; 2051 else { 2052 #if (__NetBSD_Version__ >= 799003000) 2053 mutex_enter(&ipf_ref_mutex); 2054 ipf_active = 0; 2055 mutex_exit(&ipf_ref_mutex); 2056 #endif 2057 return 0; 2058 } 2059 } 2060 2061 /* 2062 * ipfread/ipflog 2063 * both of these must operate with at least splnet() lest they be 2064 * called during packet processing and cause an inconsistancy to appear in 2065 * the filter lists. 2066 */ 2067 static int ipfread(dev_t dev, struct uio *uio, int ioflag) 2068 { 2069 2070 if (ipfmain.ipf_running < 1) { 2071 ipfmain.ipf_interror = 130006; 2072 return EIO; 2073 } 2074 2075 if (GET_MINOR(dev) == IPL_LOGSYNC) 2076 return ipf_sync_read(&ipfmain, uio); 2077 2078 #ifdef IPFILTER_LOG 2079 return ipf_log_read(&ipfmain, GET_MINOR(dev), uio); 2080 #else 2081 ipfmain.ipf_interror = 130007; 2082 return ENXIO; 2083 #endif 2084 } 2085 2086 2087 /* 2088 * ipfwrite 2089 * both of these must operate with at least splnet() lest they be 2090 * called during packet processing and cause an inconsistancy to appear in 2091 * the filter lists. 2092 */ 2093 static int ipfwrite(dev_t dev, struct uio *uio, int ioflag) 2094 { 2095 2096 if (ipfmain.ipf_running < 1) { 2097 ipfmain.ipf_interror = 130008; 2098 return EIO; 2099 } 2100 2101 if (GET_MINOR(dev) == IPL_LOGSYNC) 2102 return ipf_sync_write(&ipfmain, uio); 2103 ipfmain.ipf_interror = 130009; 2104 return ENXIO; 2105 } 2106 2107 2108 static int ipfpoll(dev_t dev, int events, PROC_T *p) 2109 { 2110 u_int unit = GET_MINOR(dev); 2111 int revents = 0; 2112 2113 if (IPL_LOGMAX < unit) { 2114 ipfmain.ipf_interror = 130010; 2115 return ENXIO; 2116 } 2117 2118 switch (unit) 2119 { 2120 case IPL_LOGIPF : 2121 case IPL_LOGNAT : 2122 case IPL_LOGSTATE : 2123 #ifdef IPFILTER_LOG 2124 if ((events & (POLLIN | POLLRDNORM)) && 2125 ipf_log_canread(&ipfmain, unit)) 2126 revents |= events & (POLLIN | POLLRDNORM); 2127 #endif 2128 break; 2129 case IPL_LOGAUTH : 2130 if ((events & (POLLIN | POLLRDNORM)) && 2131 ipf_auth_waiting(&ipfmain)) 2132 revents |= events & (POLLIN | POLLRDNORM); 2133 break; 2134 case IPL_LOGSYNC : 2135 if ((events & (POLLIN | POLLRDNORM)) && 2136 ipf_sync_canread(&ipfmain)) 2137 revents |= events & (POLLIN | POLLRDNORM); 2138 if ((events & (POLLOUT | POLLWRNORM)) && 2139 ipf_sync_canwrite(&ipfmain)) 2140 revents |= events & (POLLOUT | POLLWRNORM); 2141 break; 2142 case IPL_LOGSCAN : 2143 case IPL_LOGLOOKUP : 2144 default : 2145 break; 2146 } 2147 2148 if ((revents == 0) && (((events & (POLLIN|POLLRDNORM)) != 0))) 2149 selrecord(p, &ipfmain.ipf_selwait[unit]); 2150 return revents; 2151 } 2152 2153 u_int 2154 ipf_pcksum(fr_info_t *fin, int hlen, u_int sum) 2155 { 2156 struct mbuf *m; 2157 u_int sum2; 2158 int off; 2159 2160 m = fin->fin_m; 2161 off = (char *)fin->fin_dp - (char *)fin->fin_ip; 2162 m->m_data += hlen; 2163 m->m_len -= hlen; 2164 sum2 = in_cksum(fin->fin_m, fin->fin_plen - off); 2165 m->m_len += hlen; 2166 m->m_data -= hlen; 2167 2168 /* 2169 * Both sum and sum2 are partial sums, so combine them together. 2170 */ 2171 sum += ~sum2 & 0xffff; 2172 while (sum > 0xffff) 2173 sum = (sum & 0xffff) + (sum >> 16); 2174 sum2 = ~sum & 0xffff; 2175 return sum2; 2176 } 2177 2178 #if (__NetBSD_Version__ >= 799003000) 2179 2180 /* NetBSD module interface */ 2181 2182 MODULE(MODULE_CLASS_DRIVER, ipl, "bpf_filter"); 2183 2184 static int ipl_init(void *); 2185 static int ipl_fini(void *); 2186 static int ipl_modcmd(modcmd_t, void *); 2187 2188 #ifdef _MODULE 2189 static devmajor_t ipl_cmaj = -1, ipl_bmaj = -1; 2190 #endif 2191 2192 static int 2193 ipl_modcmd(modcmd_t cmd, void *opaque) 2194 { 2195 2196 switch (cmd) { 2197 case MODULE_CMD_INIT: 2198 return ipl_init(opaque); 2199 case MODULE_CMD_FINI: 2200 return ipl_fini(opaque); 2201 default: 2202 return ENOTTY; 2203 } 2204 } 2205 2206 static int 2207 ipl_init(void *opaque) 2208 { 2209 int error; 2210 2211 ipf_listener = kauth_listen_scope(KAUTH_SCOPE_NETWORK, 2212 ipf_listener_cb, NULL); 2213 2214 if ((error = ipf_load_all()) != 0) 2215 return error; 2216 2217 if (ipf_create_all(&ipfmain) == NULL) { 2218 ipf_unload_all(); 2219 return ENODEV; 2220 } 2221 2222 /* Initialize our mutex and reference count */ 2223 mutex_init(&ipf_ref_mutex, MUTEX_DEFAULT, IPL_NONE); 2224 ipf_active = 0; 2225 2226 #ifdef _MODULE 2227 /* 2228 * Insert ourself into the cdevsw list. 2229 */ 2230 error = devsw_attach("ipl", NULL, &ipl_bmaj, &ipl_cdevsw, &ipl_cmaj); 2231 if (error) 2232 ipl_fini(opaque); 2233 #endif 2234 2235 return error; 2236 } 2237 2238 static int 2239 ipl_fini(void *opaque) 2240 { 2241 2242 #ifdef _MODULE 2243 (void)devsw_detach(NULL, &ipl_cdevsw); 2244 #endif 2245 2246 /* 2247 * Grab the mutex, verify that there are no references 2248 * and that there are no running filters. If either 2249 * of these exists, reinsert our cdevsw entry and return 2250 * an error. 2251 */ 2252 mutex_enter(&ipf_ref_mutex); 2253 if (ipf_active != 0 || ipfmain.ipf_running > 0) { 2254 #ifdef _MODULE 2255 (void)devsw_attach("ipl", NULL, &ipl_bmaj, 2256 &ipl_cdevsw, &ipl_cmaj); 2257 #endif 2258 mutex_exit(&ipf_ref_mutex); 2259 return EBUSY; 2260 } 2261 2262 /* Clean up the rest of our state before being unloaded */ 2263 2264 mutex_exit(&ipf_ref_mutex); 2265 mutex_destroy(&ipf_ref_mutex); 2266 ipf_destroy_all(&ipfmain); 2267 ipf_unload_all(); 2268 kauth_unlisten_scope(ipf_listener); 2269 2270 return 0; 2271 } 2272 #endif /* (__NetBSD_Version__ >= 799003000) */ 2273
Indexes created Thu Sep 25 16:09:42 GMT 2025