Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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sys/netinet6/ip6_fw.c
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1 /* $FreeBSD: releng/5.2/sys/netinet6/ip6_fw.c 124320 2004-01-09 23:54:24Z dwmalone $ */ 2 /* $KAME: ip6_fw.c,v 1.21 2001/01/24 01:25:32 itojun Exp $ */ 3 4 /* 5 * Copyright (C) 1998, 1999, 2000 and 2001 WIDE Project. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the project nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33 /* 34 * Copyright (c) 1993 Daniel Boulet 35 * Copyright (c) 1994 Ugen J.S.Antsilevich 36 * Copyright (c) 1996 Alex Nash 37 * 38 * Redistribution and use in source forms, with and without modification, 39 * are permitted provided that this entire comment appears intact. 40 * 41 * Redistribution in binary form may occur without any restrictions. 42 * Obviously, it would be nice if you gave credit where credit is due 43 * but requiring it would be too onerous. 44 * 45 * This software is provided ``AS IS'' without any warranties of any kind. 46 */ 47 48 /* 49 * Implement IPv6 packet firewall 50 */ 51 52 #if !defined(KLD_MODULE) 53 #include "opt_ip6fw.h" 54 #include "opt_inet.h" 55 #include "opt_inet6.h" 56 #endif 57 58 #ifdef IP6DIVERT 59 #error "NOT SUPPORTED IPV6 DIVERT" 60 #endif 61 #ifdef IP6FW_DIVERT_RESTART 62 #error "NOT SUPPORTED IPV6 DIVERT" 63 #endif 64 65 #include <sys/param.h> 66 #include <sys/systm.h> 67 #include <sys/malloc.h> 68 #include <sys/mbuf.h> 69 #include <sys/queue.h> 70 #include <sys/kernel.h> 71 #include <sys/socket.h> 72 #include <sys/socketvar.h> 73 #include <sys/syslog.h> 74 #include <sys/time.h> 75 #include <net/if.h> 76 #include <net/route.h> 77 #include <netinet/in_systm.h> 78 #include <netinet/in.h> 79 #include <netinet/ip.h> 80 81 #include <netinet/ip6.h> 82 #include <netinet6/ip6_var.h> 83 #include <netinet6/in6_var.h> 84 #include <netinet/icmp6.h> 85 86 #include <netinet/in_pcb.h> 87 88 #include <netinet6/ip6_fw.h> 89 #include <netinet/ip_var.h> 90 #include <netinet/tcp.h> 91 #include <netinet/tcp_seq.h> 92 #include <netinet/tcp_timer.h> 93 #include <netinet/tcp_var.h> 94 #include <netinet/udp.h> 95 96 #include <sys/sysctl.h> 97 98 #include <net/net_osdep.h> 99 100 MALLOC_DEFINE(M_IP6FW, "Ip6Fw/Ip6Acct", "Ip6Fw/Ip6Acct chain's"); 101 102 static int fw6_debug = 1; 103 #ifdef IPV6FIREWALL_VERBOSE 104 static int fw6_verbose = 1; 105 #else 106 static int fw6_verbose = 0; 107 #endif 108 #ifdef IPV6FIREWALL_VERBOSE_LIMIT 109 static int fw6_verbose_limit = IPV6FIREWALL_VERBOSE_LIMIT; 110 #else 111 static int fw6_verbose_limit = 0; 112 #endif 113 114 static LIST_HEAD (ip6_fw_head, ip6_fw_chain) ip6_fw_chain; 115 116 #ifdef SYSCTL_NODE 117 SYSCTL_DECL(_net_inet6_ip6); 118 SYSCTL_NODE(_net_inet6_ip6, OID_AUTO, fw, CTLFLAG_RW | CTLFLAG_SECURE, 119 0, "Firewall"); 120 SYSCTL_INT(_net_inet6_ip6_fw, OID_AUTO, enable, CTLFLAG_RW | CTLFLAG_SECURE, 121 &ip6_fw_enable, 0, "Enable ip6fw"); 122 SYSCTL_INT(_net_inet6_ip6_fw, OID_AUTO, debug, CTLFLAG_RW, &fw6_debug, 0, ""); 123 SYSCTL_INT(_net_inet6_ip6_fw, OID_AUTO, verbose, CTLFLAG_RW | CTLFLAG_SECURE, 124 &fw6_verbose, 0, ""); 125 SYSCTL_INT(_net_inet6_ip6_fw, OID_AUTO, verbose_limit, CTLFLAG_RW, &fw6_verbose_limit, 0, ""); 126 #endif 127 128 #define dprintf(a) do { \ 129 if (fw6_debug) \ 130 printf a; \ 131 } while (/*CONSTCOND*/ 0) 132 #define SNPARGS(buf, len) buf + len, sizeof(buf) > len ? sizeof(buf) - len : 0 133 134 static int add_entry6 __P((struct ip6_fw_head *chainptr, struct ip6_fw *frwl)); 135 static int del_entry6 __P((struct ip6_fw_head *chainptr, u_short number)); 136 static int zero_entry6 __P((struct mbuf *m)); 137 static struct ip6_fw *check_ip6fw_struct __P((struct ip6_fw *m)); 138 static struct ip6_fw *check_ip6fw_mbuf __P((struct mbuf *fw)); 139 static int ip6opts_match __P((struct ip6_hdr **ip6, struct ip6_fw *f, 140 struct mbuf **m, 141 int *off, int *nxt, u_short *offset)); 142 static int port_match6 __P((u_short *portptr, int nports, u_short port, 143 int range_flag)); 144 static int tcp6flg_match __P((struct tcphdr *tcp6, struct ip6_fw *f)); 145 static int icmp6type_match __P((struct icmp6_hdr * icmp, struct ip6_fw * f)); 146 static void ip6fw_report __P((struct ip6_fw *f, struct ip6_hdr *ip6, 147 struct ifnet *rif, struct ifnet *oif, int off, int nxt)); 148 149 static int ip6_fw_chk __P((struct ip6_hdr **pip6, 150 struct ifnet *oif, u_int16_t *cookie, struct mbuf **m)); 151 static int ip6_fw_ctl __P((int stage, struct mbuf **mm)); 152 153 static char err_prefix[] = "ip6_fw_ctl:"; 154 155 /* 156 * Returns 1 if the port is matched by the vector, 0 otherwise 157 */ 158 static 159 __inline 160 int 161 port_match6(u_short *portptr, int nports, u_short port, int range_flag) 162 { 163 if (!nports) 164 return 1; 165 if (range_flag) { 166 if (portptr[0] <= port && port <= portptr[1]) { 167 return 1; 168 } 169 nports -= 2; 170 portptr += 2; 171 } 172 while (nports-- > 0) { 173 if (*portptr++ == port) { 174 return 1; 175 } 176 } 177 return 0; 178 } 179 180 static int 181 tcp6flg_match(struct tcphdr *tcp6, struct ip6_fw *f) 182 { 183 u_char flg_set, flg_clr; 184 185 /* 186 * If an established connection is required, reject packets that 187 * have only SYN of RST|ACK|SYN set. Otherwise, fall through to 188 * other flag requirements. 189 */ 190 if ((f->fw_ipflg & IPV6_FW_IF_TCPEST) && 191 ((tcp6->th_flags & (IPV6_FW_TCPF_RST | IPV6_FW_TCPF_ACK | 192 IPV6_FW_TCPF_SYN)) == IPV6_FW_TCPF_SYN)) 193 return 0; 194 195 flg_set = tcp6->th_flags & f->fw_tcpf; 196 flg_clr = tcp6->th_flags & f->fw_tcpnf; 197 198 if (flg_set != f->fw_tcpf) 199 return 0; 200 if (flg_clr) 201 return 0; 202 203 return 1; 204 } 205 206 static int 207 icmp6type_match(struct icmp6_hdr *icmp6, struct ip6_fw *f) 208 { 209 int type; 210 211 if (!(f->fw_flg & IPV6_FW_F_ICMPBIT)) 212 return (1); 213 214 type = icmp6->icmp6_type; 215 216 /* check for matching type in the bitmap */ 217 if (type < IPV6_FW_ICMPTYPES_DIM * sizeof(unsigned) * 8 && 218 (f->fw_icmp6types[type / (sizeof(unsigned) * 8)] & 219 (1U << (type % (8 * sizeof(unsigned)))))) 220 return (1); 221 222 return (0); /* no match */ 223 } 224 225 static int 226 is_icmp6_query(struct ip6_hdr *ip6, int off) 227 { 228 const struct icmp6_hdr *icmp6; 229 int icmp6_type; 230 231 icmp6 = (struct icmp6_hdr *)((caddr_t)ip6 + off); 232 icmp6_type = icmp6->icmp6_type; 233 234 if (icmp6_type == ICMP6_ECHO_REQUEST || 235 icmp6_type == ICMP6_MEMBERSHIP_QUERY || 236 icmp6_type == ICMP6_WRUREQUEST || 237 icmp6_type == ICMP6_FQDN_QUERY || 238 icmp6_type == ICMP6_NI_QUERY) 239 return (1); 240 241 return (0); 242 } 243 244 static int 245 ip6opts_match(struct ip6_hdr **pip6, struct ip6_fw *f, struct mbuf **m, 246 int *off, int *nxt, u_short *offset) 247 { 248 int len; 249 struct ip6_hdr *ip6 = *pip6; 250 struct ip6_ext *ip6e; 251 u_char opts, nopts, nopts_sve; 252 253 opts = f->fw_ip6opt; 254 nopts = nopts_sve = f->fw_ip6nopt; 255 256 *nxt = ip6->ip6_nxt; 257 *off = sizeof(struct ip6_hdr); 258 len = ntohs(ip6->ip6_plen) + sizeof(struct ip6_hdr); 259 while (*off < len) { 260 ip6e = (struct ip6_ext *)((caddr_t) ip6 + *off); 261 if ((*m)->m_len < *off + sizeof(*ip6e)) 262 goto opts_check; /* XXX */ 263 264 switch (*nxt) { 265 case IPPROTO_FRAGMENT: 266 if ((*m)->m_len >= *off + sizeof(struct ip6_frag)) { 267 struct ip6_frag *ip6f; 268 269 ip6f = (struct ip6_frag *) ((caddr_t)ip6 + *off); 270 *offset = ip6f->ip6f_offlg & IP6F_OFF_MASK; 271 } 272 opts &= ~IPV6_FW_IP6OPT_FRAG; 273 nopts &= ~IPV6_FW_IP6OPT_FRAG; 274 *off += sizeof(struct ip6_frag); 275 break; 276 case IPPROTO_AH: 277 opts &= ~IPV6_FW_IP6OPT_AH; 278 nopts &= ~IPV6_FW_IP6OPT_AH; 279 *off += (ip6e->ip6e_len + 2) << 2; 280 break; 281 default: 282 switch (*nxt) { 283 case IPPROTO_HOPOPTS: 284 opts &= ~IPV6_FW_IP6OPT_HOPOPT; 285 nopts &= ~IPV6_FW_IP6OPT_HOPOPT; 286 break; 287 case IPPROTO_ROUTING: 288 opts &= ~IPV6_FW_IP6OPT_ROUTE; 289 nopts &= ~IPV6_FW_IP6OPT_ROUTE; 290 break; 291 case IPPROTO_ESP: 292 opts &= ~IPV6_FW_IP6OPT_ESP; 293 nopts &= ~IPV6_FW_IP6OPT_ESP; 294 goto opts_check; 295 case IPPROTO_NONE: 296 opts &= ~IPV6_FW_IP6OPT_NONXT; 297 nopts &= ~IPV6_FW_IP6OPT_NONXT; 298 goto opts_check; 299 case IPPROTO_DSTOPTS: 300 opts &= ~IPV6_FW_IP6OPT_OPTS; 301 nopts &= ~IPV6_FW_IP6OPT_OPTS; 302 break; 303 default: 304 goto opts_check; 305 } 306 *off += (ip6e->ip6e_len + 1) << 3; 307 break; 308 } 309 *nxt = ip6e->ip6e_nxt; 310 311 } 312 opts_check: 313 if (f->fw_ip6opt == f->fw_ip6nopt) /* XXX */ 314 return 1; 315 316 if (opts == 0 && nopts == nopts_sve) 317 return 1; 318 else 319 return 0; 320 } 321 322 static 323 __inline 324 int 325 iface_match(struct ifnet *ifp, union ip6_fw_if *ifu, int byname) 326 { 327 /* Check by name or by IP address */ 328 if (byname) { 329 /* Check name */ 330 if (ifu->fu_via_if.glob) { 331 if (fnmatch(ifu->fu_via_if.name, ifp->if_xname, 0) 332 == FNM_NOMATCH) 333 return(0); 334 } else { 335 if (strncmp(ifp->if_xname, ifu->fu_via_if.name, 336 IP6FW_IFNLEN) != 0) 337 return(0); 338 } 339 return(1); 340 } else if (!IN6_IS_ADDR_UNSPECIFIED(&ifu->fu_via_ip6)) { /* Zero == wildcard */ 341 struct ifaddr *ia; 342 343 for (ia = ifp->if_addrlist.tqh_first; ia; ia = ia->ifa_list.tqe_next) { 344 345 if (ia->ifa_addr == NULL) 346 continue; 347 if (ia->ifa_addr->sa_family != AF_INET6) 348 continue; 349 if (!IN6_ARE_ADDR_EQUAL(&ifu->fu_via_ip6, 350 &(((struct sockaddr_in6 *) 351 (ia->ifa_addr))->sin6_addr))) 352 continue; 353 return (1); 354 } 355 return (0); 356 } 357 return (1); 358 } 359 360 static void 361 ip6fw_report(struct ip6_fw *f, struct ip6_hdr *ip6, 362 struct ifnet *rif, struct ifnet *oif, int off, int nxt) 363 { 364 static int counter; 365 struct tcphdr *const tcp6 = (struct tcphdr *) ((caddr_t) ip6+ off); 366 struct udphdr *const udp = (struct udphdr *) ((caddr_t) ip6+ off); 367 struct icmp6_hdr *const icmp6 = (struct icmp6_hdr *) ((caddr_t) ip6+ off); 368 int count; 369 char *action; 370 char action2[32], proto[102], name[18]; 371 int len; 372 373 count = f ? f->fw_pcnt : ++counter; 374 if (fw6_verbose_limit != 0 && count > fw6_verbose_limit) 375 return; 376 377 /* Print command name */ 378 snprintf(SNPARGS(name, 0), "ip6fw: %d", f ? f->fw_number : -1); 379 380 action = action2; 381 if (!f) 382 action = "Refuse"; 383 else { 384 switch (f->fw_flg & IPV6_FW_F_COMMAND) { 385 case IPV6_FW_F_DENY: 386 action = "Deny"; 387 break; 388 case IPV6_FW_F_REJECT: 389 if (f->fw_reject_code == IPV6_FW_REJECT_RST) 390 action = "Reset"; 391 else 392 action = "Unreach"; 393 break; 394 case IPV6_FW_F_ACCEPT: 395 action = "Accept"; 396 break; 397 case IPV6_FW_F_COUNT: 398 action = "Count"; 399 break; 400 case IPV6_FW_F_DIVERT: 401 snprintf(SNPARGS(action2, 0), "Divert %d", 402 f->fw_divert_port); 403 break; 404 case IPV6_FW_F_TEE: 405 snprintf(SNPARGS(action2, 0), "Tee %d", 406 f->fw_divert_port); 407 break; 408 case IPV6_FW_F_SKIPTO: 409 snprintf(SNPARGS(action2, 0), "SkipTo %d", 410 f->fw_skipto_rule); 411 break; 412 default: 413 action = "UNKNOWN"; 414 break; 415 } 416 } 417 418 switch (nxt) { 419 case IPPROTO_TCP: 420 len = snprintf(SNPARGS(proto, 0), "TCP [%s]", 421 ip6_sprintf(&ip6->ip6_src)); 422 if (off > 0) 423 len += snprintf(SNPARGS(proto, len), ":%d ", 424 ntohs(tcp6->th_sport)); 425 else 426 len += snprintf(SNPARGS(proto, len), " "); 427 len += snprintf(SNPARGS(proto, len), "[%s]", 428 ip6_sprintf(&ip6->ip6_dst)); 429 if (off > 0) 430 snprintf(SNPARGS(proto, len), ":%d", 431 ntohs(tcp6->th_dport)); 432 break; 433 case IPPROTO_UDP: 434 len = snprintf(SNPARGS(proto, 0), "UDP [%s]", 435 ip6_sprintf(&ip6->ip6_src)); 436 if (off > 0) 437 len += snprintf(SNPARGS(proto, len), ":%d ", 438 ntohs(udp->uh_sport)); 439 else 440 len += snprintf(SNPARGS(proto, len), " "); 441 len += snprintf(SNPARGS(proto, len), "[%s]", 442 ip6_sprintf(&ip6->ip6_dst)); 443 if (off > 0) 444 snprintf(SNPARGS(proto, len), ":%d", 445 ntohs(udp->uh_dport)); 446 break; 447 case IPPROTO_ICMPV6: 448 if (off > 0) 449 len = snprintf(SNPARGS(proto, 0), "IPV6-ICMP:%u.%u ", 450 icmp6->icmp6_type, icmp6->icmp6_code); 451 else 452 len = snprintf(SNPARGS(proto, 0), "IPV6-ICMP "); 453 len += snprintf(SNPARGS(proto, len), "[%s]", 454 ip6_sprintf(&ip6->ip6_src)); 455 snprintf(SNPARGS(proto, len), " [%s]", 456 ip6_sprintf(&ip6->ip6_dst)); 457 break; 458 default: 459 len = snprintf(SNPARGS(proto, 0), "P:%d [%s]", nxt, 460 ip6_sprintf(&ip6->ip6_src)); 461 snprintf(SNPARGS(proto, len), " [%s]", 462 ip6_sprintf(&ip6->ip6_dst)); 463 break; 464 } 465 466 if (oif) 467 log(LOG_SECURITY | LOG_INFO, "%s %s %s out via %s\n", 468 name, action, proto, if_name(oif)); 469 else if (rif) 470 log(LOG_SECURITY | LOG_INFO, "%s %s %s in via %s\n", 471 name, action, proto, if_name(rif)); 472 else 473 log(LOG_SECURITY | LOG_INFO, "%s %s %s", 474 name, action, proto); 475 if (fw6_verbose_limit != 0 && count == fw6_verbose_limit) 476 log(LOG_SECURITY | LOG_INFO, "ip6fw: limit reached on entry %d\n", 477 f ? f->fw_number : -1); 478 } 479 480 /* 481 * Parameters: 482 * 483 * ip Pointer to packet header (struct ip6_hdr *) 484 * hlen Packet header length 485 * oif Outgoing interface, or NULL if packet is incoming 486 * #ifndef IP6FW_DIVERT_RESTART 487 * *cookie Ignore all divert/tee rules to this port (if non-zero) 488 * #else 489 * *cookie Skip up to the first rule past this rule number; 490 * #endif 491 * *m The packet; we set to NULL when/if we nuke it. 492 * 493 * Return value: 494 * 495 * 0 The packet is to be accepted and routed normally OR 496 * the packet was denied/rejected and has been dropped; 497 * in the latter case, *m is equal to NULL upon return. 498 * port Divert the packet to port. 499 */ 500 501 static int 502 ip6_fw_chk(struct ip6_hdr **pip6, 503 struct ifnet *oif, u_int16_t *cookie, struct mbuf **m) 504 { 505 struct ip6_fw_chain *chain; 506 struct ip6_fw *rule = NULL; 507 struct ip6_hdr *ip6 = *pip6; 508 struct ifnet *const rif = (*m)->m_pkthdr.rcvif; 509 u_short offset = 0; 510 int off = sizeof(struct ip6_hdr), nxt = ip6->ip6_nxt; 511 u_short src_port, dst_port; 512 #ifdef IP6FW_DIVERT_RESTART 513 u_int16_t skipto = *cookie; 514 #else 515 u_int16_t ignport = ntohs(*cookie); 516 #endif 517 518 *cookie = 0; 519 /* 520 * Go down the chain, looking for enlightment 521 * #ifdef IP6FW_DIVERT_RESTART 522 * If we've been asked to start at a given rule immediatly, do so. 523 * #endif 524 */ 525 chain = LIST_FIRST(&ip6_fw_chain); 526 #ifdef IP6FW_DIVERT_RESTART 527 if (skipto) { 528 if (skipto >= 65535) 529 goto dropit; 530 while (chain && (chain->rule->fw_number <= skipto)) { 531 chain = LIST_NEXT(chain, chain); 532 } 533 if (! chain) goto dropit; 534 } 535 #endif /* IP6FW_DIVERT_RESTART */ 536 for (; chain; chain = LIST_NEXT(chain, chain)) { 537 struct ip6_fw *const f = chain->rule; 538 539 if (oif) { 540 /* Check direction outbound */ 541 if (!(f->fw_flg & IPV6_FW_F_OUT)) 542 continue; 543 } else { 544 /* Check direction inbound */ 545 if (!(f->fw_flg & IPV6_FW_F_IN)) 546 continue; 547 } 548 549 #define IN6_ARE_ADDR_MASKEQUAL(x,y,z) (\ 550 (((x)->s6_addr32[0] & (y)->s6_addr32[0]) == (z)->s6_addr32[0]) && \ 551 (((x)->s6_addr32[1] & (y)->s6_addr32[1]) == (z)->s6_addr32[1]) && \ 552 (((x)->s6_addr32[2] & (y)->s6_addr32[2]) == (z)->s6_addr32[2]) && \ 553 (((x)->s6_addr32[3] & (y)->s6_addr32[3]) == (z)->s6_addr32[3])) 554 555 /* If src-addr doesn't match, not this rule. */ 556 if (((f->fw_flg & IPV6_FW_F_INVSRC) != 0) ^ 557 (!IN6_ARE_ADDR_MASKEQUAL(&ip6->ip6_src,&f->fw_smsk,&f->fw_src))) 558 continue; 559 560 /* If dest-addr doesn't match, not this rule. */ 561 if (((f->fw_flg & IPV6_FW_F_INVDST) != 0) ^ 562 (!IN6_ARE_ADDR_MASKEQUAL(&ip6->ip6_dst,&f->fw_dmsk,&f->fw_dst))) 563 continue; 564 565 #undef IN6_ARE_ADDR_MASKEQUAL 566 /* Interface check */ 567 if ((f->fw_flg & IF6_FW_F_VIAHACK) == IF6_FW_F_VIAHACK) { 568 struct ifnet *const iface = oif ? oif : rif; 569 570 /* Backwards compatibility hack for "via" */ 571 if (!iface || !iface_match(iface, 572 &f->fw_in_if, f->fw_flg & IPV6_FW_F_OIFNAME)) 573 continue; 574 } else { 575 /* Check receive interface */ 576 if ((f->fw_flg & IPV6_FW_F_IIFACE) 577 && (!rif || !iface_match(rif, 578 &f->fw_in_if, f->fw_flg & IPV6_FW_F_IIFNAME))) 579 continue; 580 /* Check outgoing interface */ 581 if ((f->fw_flg & IPV6_FW_F_OIFACE) 582 && (!oif || !iface_match(oif, 583 &f->fw_out_if, f->fw_flg & IPV6_FW_F_OIFNAME))) 584 continue; 585 } 586 587 /* Check IP options */ 588 if (!ip6opts_match(&ip6, f, m, &off, &nxt, &offset)) 589 continue; 590 591 /* Fragments */ 592 if ((f->fw_flg & IPV6_FW_F_FRAG) && !offset) 593 continue; 594 595 /* Check protocol; if wildcard, match */ 596 if (f->fw_prot == IPPROTO_IPV6) 597 goto got_match; 598 599 /* If different, don't match */ 600 if (nxt != f->fw_prot) 601 continue; 602 603 #define PULLUP_TO(len) do { \ 604 if ((*m)->m_len < (len) \ 605 && (*m = m_pullup(*m, (len))) == 0) { \ 606 goto dropit; \ 607 } \ 608 *pip6 = ip6 = mtod(*m, struct ip6_hdr *); \ 609 } while (/*CONSTCOND*/ 0) 610 611 /* Protocol specific checks */ 612 switch (nxt) { 613 case IPPROTO_TCP: 614 { 615 struct tcphdr *tcp6; 616 617 if (offset == 1) { /* cf. RFC 1858 */ 618 PULLUP_TO(off + 4); /* XXX ? */ 619 goto bogusfrag; 620 } 621 if (offset != 0) { 622 /* 623 * TCP flags and ports aren't available in this 624 * packet -- if this rule specified either one, 625 * we consider the rule a non-match. 626 */ 627 if (f->fw_nports != 0 || 628 f->fw_tcpf != f->fw_tcpnf) 629 continue; 630 631 break; 632 } 633 PULLUP_TO(off + 14); 634 tcp6 = (struct tcphdr *) ((caddr_t)ip6 + off); 635 if (((f->fw_tcpf != f->fw_tcpnf) || 636 (f->fw_ipflg & IPV6_FW_IF_TCPEST)) && 637 !tcp6flg_match(tcp6, f)) 638 continue; 639 src_port = ntohs(tcp6->th_sport); 640 dst_port = ntohs(tcp6->th_dport); 641 goto check_ports; 642 } 643 644 case IPPROTO_UDP: 645 { 646 struct udphdr *udp; 647 648 if (offset != 0) { 649 /* 650 * Port specification is unavailable -- if this 651 * rule specifies a port, we consider the rule 652 * a non-match. 653 */ 654 if (f->fw_nports != 0) 655 continue; 656 657 break; 658 } 659 PULLUP_TO(off + 4); 660 udp = (struct udphdr *) ((caddr_t)ip6 + off); 661 src_port = ntohs(udp->uh_sport); 662 dst_port = ntohs(udp->uh_dport); 663 check_ports: 664 if (!port_match6(&f->fw_pts[0], 665 IPV6_FW_GETNSRCP(f), src_port, 666 f->fw_flg & IPV6_FW_F_SRNG)) 667 continue; 668 if (!port_match6(&f->fw_pts[IPV6_FW_GETNSRCP(f)], 669 IPV6_FW_GETNDSTP(f), dst_port, 670 f->fw_flg & IPV6_FW_F_DRNG)) 671 continue; 672 break; 673 } 674 675 case IPPROTO_ICMPV6: 676 { 677 struct icmp6_hdr *icmp; 678 679 if (offset != 0) /* Type isn't valid */ 680 break; 681 PULLUP_TO(off + 2); 682 icmp = (struct icmp6_hdr *) ((caddr_t)ip6 + off); 683 if (!icmp6type_match(icmp, f)) 684 continue; 685 break; 686 } 687 #undef PULLUP_TO 688 689 bogusfrag: 690 if (fw6_verbose) 691 ip6fw_report(NULL, ip6, rif, oif, off, nxt); 692 goto dropit; 693 } 694 695 got_match: 696 #ifndef IP6FW_DIVERT_RESTART 697 /* Ignore divert/tee rule if socket port is "ignport" */ 698 switch (f->fw_flg & IPV6_FW_F_COMMAND) { 699 case IPV6_FW_F_DIVERT: 700 case IPV6_FW_F_TEE: 701 if (f->fw_divert_port == ignport) 702 continue; /* ignore this rule */ 703 break; 704 } 705 706 #endif /* IP6FW_DIVERT_RESTART */ 707 /* Update statistics */ 708 f->fw_pcnt += 1; 709 f->fw_bcnt += ntohs(ip6->ip6_plen); 710 f->timestamp = time_second; 711 712 /* Log to console if desired */ 713 if ((f->fw_flg & IPV6_FW_F_PRN) && fw6_verbose) 714 ip6fw_report(f, ip6, rif, oif, off, nxt); 715 716 /* Take appropriate action */ 717 switch (f->fw_flg & IPV6_FW_F_COMMAND) { 718 case IPV6_FW_F_ACCEPT: 719 return (0); 720 case IPV6_FW_F_COUNT: 721 continue; 722 case IPV6_FW_F_DIVERT: 723 #ifdef IP6FW_DIVERT_RESTART 724 *cookie = f->fw_number; 725 #else 726 *cookie = htons(f->fw_divert_port); 727 #endif /* IP6FW_DIVERT_RESTART */ 728 return (f->fw_divert_port); 729 case IPV6_FW_F_TEE: 730 /* 731 * XXX someday tee packet here, but beware that you 732 * can't use m_copym() or m_copypacket() because 733 * the divert input routine modifies the mbuf 734 * (and these routines only increment reference 735 * counts in the case of mbuf clusters), so need 736 * to write custom routine. 737 */ 738 continue; 739 case IPV6_FW_F_SKIPTO: 740 #ifdef DIAGNOSTIC 741 while (chain->chain.le_next 742 && chain->chain.le_next->rule->fw_number 743 < f->fw_skipto_rule) 744 #else 745 while (chain->chain.le_next->rule->fw_number 746 < f->fw_skipto_rule) 747 #endif 748 chain = chain->chain.le_next; 749 continue; 750 } 751 752 /* Deny/reject this packet using this rule */ 753 rule = f; 754 break; 755 } 756 757 #ifdef DIAGNOSTIC 758 /* Rule 65535 should always be there and should always match */ 759 if (!chain) 760 panic("ip6_fw: chain"); 761 #endif 762 763 /* 764 * At this point, we're going to drop the packet. 765 * Send a reject notice if all of the following are true: 766 * 767 * - The packet matched a reject rule 768 * - The packet is not an ICMP packet, or is an ICMP query packet 769 * - The packet is not a multicast or broadcast packet 770 */ 771 if ((rule->fw_flg & IPV6_FW_F_COMMAND) == IPV6_FW_F_REJECT 772 && (nxt != IPPROTO_ICMPV6 || is_icmp6_query(ip6, off)) 773 && !((*m)->m_flags & (M_BCAST|M_MCAST)) 774 && !IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 775 switch (rule->fw_reject_code) { 776 case IPV6_FW_REJECT_RST: 777 #if 1 /* not tested */ 778 { 779 struct tcphdr *const tcp = 780 (struct tcphdr *) ((caddr_t)ip6 + off); 781 struct { 782 struct ip6_hdr ip6; 783 struct tcphdr th; 784 } ti; 785 tcp_seq ack, seq; 786 int flags; 787 788 if (offset != 0 || (tcp->th_flags & TH_RST)) 789 break; 790 791 ti.ip6 = *ip6; 792 ti.th = *tcp; 793 ti.th.th_seq = ntohl(ti.th.th_seq); 794 ti.th.th_ack = ntohl(ti.th.th_ack); 795 ti.ip6.ip6_nxt = IPPROTO_TCP; 796 if (ti.th.th_flags & TH_ACK) { 797 ack = 0; 798 seq = ti.th.th_ack; 799 flags = TH_RST; 800 } else { 801 ack = ti.th.th_seq; 802 if (((*m)->m_flags & M_PKTHDR) != 0) { 803 ack += (*m)->m_pkthdr.len - off 804 - (ti.th.th_off << 2); 805 } else if (ip6->ip6_plen) { 806 ack += ntohs(ip6->ip6_plen) + sizeof(*ip6) 807 - off - (ti.th.th_off << 2); 808 } else { 809 m_freem(*m); 810 *m = 0; 811 break; 812 } 813 if (tcp->th_flags & TH_SYN) 814 ack++; 815 seq = 0; 816 flags = TH_RST|TH_ACK; 817 } 818 bcopy(&ti, ip6, sizeof(ti)); 819 tcp_respond(NULL, ip6, (struct tcphdr *)(ip6 + 1), 820 *m, ack, seq, flags); 821 *m = NULL; 822 break; 823 } 824 #endif 825 default: /* Send an ICMP unreachable using code */ 826 if (oif) 827 (*m)->m_pkthdr.rcvif = oif; 828 icmp6_error(*m, ICMP6_DST_UNREACH, 829 rule->fw_reject_code, 0); 830 *m = NULL; 831 break; 832 } 833 } 834 835 dropit: 836 /* 837 * Finally, drop the packet. 838 */ 839 if (*m) { 840 m_freem(*m); 841 *m = NULL; 842 } 843 return (0); 844 } 845 846 static int 847 add_entry6(struct ip6_fw_head *chainptr, struct ip6_fw *frwl) 848 { 849 struct ip6_fw *ftmp = 0; 850 struct ip6_fw_chain *fwc = 0, *fcp, *fcpl = 0; 851 u_short nbr = 0; 852 int s; 853 854 fwc = malloc(sizeof *fwc, M_IP6FW, M_NOWAIT); 855 ftmp = malloc(sizeof *ftmp, M_IP6FW, M_NOWAIT); 856 if (!fwc || !ftmp) { 857 dprintf(("%s malloc said no\n", err_prefix)); 858 if (fwc) free(fwc, M_IP6FW); 859 if (ftmp) free(ftmp, M_IP6FW); 860 return (ENOSPC); 861 } 862 863 bcopy(frwl, ftmp, sizeof(struct ip6_fw)); 864 ftmp->fw_in_if.fu_via_if.name[IP6FW_IFNLEN - 1] = '\0'; 865 ftmp->fw_pcnt = 0L; 866 ftmp->fw_bcnt = 0L; 867 fwc->rule = ftmp; 868 869 s = splnet(); 870 871 if (!chainptr->lh_first) { 872 LIST_INSERT_HEAD(chainptr, fwc, chain); 873 splx(s); 874 return (0); 875 } else if (ftmp->fw_number == (u_short)-1) { 876 if (fwc) free(fwc, M_IP6FW); 877 if (ftmp) free(ftmp, M_IP6FW); 878 splx(s); 879 dprintf(("%s bad rule number\n", err_prefix)); 880 return (EINVAL); 881 } 882 883 /* If entry number is 0, find highest numbered rule and add 100 */ 884 if (ftmp->fw_number == 0) { 885 for (fcp = chainptr->lh_first; fcp; fcp = fcp->chain.le_next) { 886 if (fcp->rule->fw_number != (u_short)-1) 887 nbr = fcp->rule->fw_number; 888 else 889 break; 890 } 891 if (nbr < (u_short)-1 - 100) 892 nbr += 100; 893 ftmp->fw_number = nbr; 894 } 895 896 /* Got a valid number; now insert it, keeping the list ordered */ 897 for (fcp = chainptr->lh_first; fcp; fcp = fcp->chain.le_next) { 898 if (fcp->rule->fw_number > ftmp->fw_number) { 899 if (fcpl) { 900 LIST_INSERT_AFTER(fcpl, fwc, chain); 901 } else { 902 LIST_INSERT_HEAD(chainptr, fwc, chain); 903 } 904 break; 905 } else { 906 fcpl = fcp; 907 } 908 } 909 910 splx(s); 911 return (0); 912 } 913 914 static int 915 del_entry6(struct ip6_fw_head *chainptr, u_short number) 916 { 917 struct ip6_fw_chain *fcp; 918 int s; 919 920 s = splnet(); 921 922 fcp = chainptr->lh_first; 923 if (number != (u_short)-1) { 924 for (; fcp; fcp = fcp->chain.le_next) { 925 if (fcp->rule->fw_number == number) { 926 LIST_REMOVE(fcp, chain); 927 splx(s); 928 free(fcp->rule, M_IP6FW); 929 free(fcp, M_IP6FW); 930 return 0; 931 } 932 } 933 } 934 935 splx(s); 936 return (EINVAL); 937 } 938 939 static int 940 zero_entry6(struct mbuf *m) 941 { 942 struct ip6_fw *frwl; 943 struct ip6_fw_chain *fcp; 944 int s; 945 946 if (m && m->m_len != 0) { 947 if (m->m_len != sizeof(struct ip6_fw)) 948 return (EINVAL); 949 frwl = mtod(m, struct ip6_fw *); 950 } 951 else 952 frwl = NULL; 953 954 /* 955 * It's possible to insert multiple chain entries with the 956 * same number, so we don't stop after finding the first 957 * match if zeroing a specific entry. 958 */ 959 s = splnet(); 960 for (fcp = ip6_fw_chain.lh_first; fcp; fcp = fcp->chain.le_next) 961 if (!frwl || frwl->fw_number == fcp->rule->fw_number) { 962 fcp->rule->fw_bcnt = fcp->rule->fw_pcnt = 0; 963 fcp->rule->timestamp = 0; 964 } 965 splx(s); 966 967 if (fw6_verbose) { 968 if (frwl) 969 log(LOG_SECURITY | LOG_NOTICE, 970 "ip6fw: Entry %d cleared.\n", frwl->fw_number); 971 else 972 log(LOG_SECURITY | LOG_NOTICE, 973 "ip6fw: Accounting cleared.\n"); 974 } 975 976 return (0); 977 } 978 979 static struct ip6_fw * 980 check_ip6fw_mbuf(struct mbuf *m) 981 { 982 /* Check length */ 983 if (m->m_len != sizeof(struct ip6_fw)) { 984 dprintf(("%s len=%d, want %zu\n", err_prefix, m->m_len, 985 sizeof(struct ip6_fw))); 986 return (NULL); 987 } 988 return (check_ip6fw_struct(mtod(m, struct ip6_fw *))); 989 } 990 991 static struct ip6_fw * 992 check_ip6fw_struct(struct ip6_fw *frwl) 993 { 994 /* Check for invalid flag bits */ 995 if ((frwl->fw_flg & ~IPV6_FW_F_MASK) != 0) { 996 dprintf(("%s undefined flag bits set (flags=%x)\n", 997 err_prefix, frwl->fw_flg)); 998 return (NULL); 999 } 1000 /* Must apply to incoming or outgoing (or both) */ 1001 if (!(frwl->fw_flg & (IPV6_FW_F_IN | IPV6_FW_F_OUT))) { 1002 dprintf(("%s neither in nor out\n", err_prefix)); 1003 return (NULL); 1004 } 1005 /* Empty interface name is no good */ 1006 if (((frwl->fw_flg & IPV6_FW_F_IIFNAME) 1007 && !*frwl->fw_in_if.fu_via_if.name) 1008 || ((frwl->fw_flg & IPV6_FW_F_OIFNAME) 1009 && !*frwl->fw_out_if.fu_via_if.name)) { 1010 dprintf(("%s empty interface name\n", err_prefix)); 1011 return (NULL); 1012 } 1013 /* Sanity check interface matching */ 1014 if ((frwl->fw_flg & IF6_FW_F_VIAHACK) == IF6_FW_F_VIAHACK) { 1015 ; /* allow "via" backwards compatibility */ 1016 } else if ((frwl->fw_flg & IPV6_FW_F_IN) 1017 && (frwl->fw_flg & IPV6_FW_F_OIFACE)) { 1018 dprintf(("%s outgoing interface check on incoming\n", 1019 err_prefix)); 1020 return (NULL); 1021 } 1022 /* Sanity check port ranges */ 1023 if ((frwl->fw_flg & IPV6_FW_F_SRNG) && IPV6_FW_GETNSRCP(frwl) < 2) { 1024 dprintf(("%s src range set but n_src_p=%d\n", 1025 err_prefix, IPV6_FW_GETNSRCP(frwl))); 1026 return (NULL); 1027 } 1028 if ((frwl->fw_flg & IPV6_FW_F_DRNG) && IPV6_FW_GETNDSTP(frwl) < 2) { 1029 dprintf(("%s dst range set but n_dst_p=%d\n", 1030 err_prefix, IPV6_FW_GETNDSTP(frwl))); 1031 return (NULL); 1032 } 1033 if (IPV6_FW_GETNSRCP(frwl) + IPV6_FW_GETNDSTP(frwl) > IPV6_FW_MAX_PORTS) { 1034 dprintf(("%s too many ports (%d+%d)\n", 1035 err_prefix, IPV6_FW_GETNSRCP(frwl), IPV6_FW_GETNDSTP(frwl))); 1036 return (NULL); 1037 } 1038 /* 1039 * Protocols other than TCP/UDP don't use port range 1040 */ 1041 if ((frwl->fw_prot != IPPROTO_TCP) && 1042 (frwl->fw_prot != IPPROTO_UDP) && 1043 (IPV6_FW_GETNSRCP(frwl) || IPV6_FW_GETNDSTP(frwl))) { 1044 dprintf(("%s port(s) specified for non TCP/UDP rule\n", 1045 err_prefix)); 1046 return (NULL); 1047 } 1048 1049 /* 1050 * Rather than modify the entry to make such entries work, 1051 * we reject this rule and require user level utilities 1052 * to enforce whatever policy they deem appropriate. 1053 */ 1054 if ((frwl->fw_src.s6_addr32[0] & (~frwl->fw_smsk.s6_addr32[0])) || 1055 (frwl->fw_src.s6_addr32[1] & (~frwl->fw_smsk.s6_addr32[1])) || 1056 (frwl->fw_src.s6_addr32[2] & (~frwl->fw_smsk.s6_addr32[2])) || 1057 (frwl->fw_src.s6_addr32[3] & (~frwl->fw_smsk.s6_addr32[3])) || 1058 (frwl->fw_dst.s6_addr32[0] & (~frwl->fw_dmsk.s6_addr32[0])) || 1059 (frwl->fw_dst.s6_addr32[1] & (~frwl->fw_dmsk.s6_addr32[1])) || 1060 (frwl->fw_dst.s6_addr32[2] & (~frwl->fw_dmsk.s6_addr32[2])) || 1061 (frwl->fw_dst.s6_addr32[3] & (~frwl->fw_dmsk.s6_addr32[3]))) { 1062 dprintf(("%s rule never matches\n", err_prefix)); 1063 return (NULL); 1064 } 1065 1066 if ((frwl->fw_flg & IPV6_FW_F_FRAG) && 1067 (frwl->fw_prot == IPPROTO_UDP || frwl->fw_prot == IPPROTO_TCP)) { 1068 if (frwl->fw_nports) { 1069 dprintf(("%s cannot mix 'frag' and ports\n", err_prefix)); 1070 return (NULL); 1071 } 1072 if (frwl->fw_prot == IPPROTO_TCP && 1073 frwl->fw_tcpf != frwl->fw_tcpnf) { 1074 dprintf(("%s cannot mix 'frag' with TCP flags\n", err_prefix)); 1075 return (NULL); 1076 } 1077 } 1078 1079 /* Check command specific stuff */ 1080 switch (frwl->fw_flg & IPV6_FW_F_COMMAND) 1081 { 1082 case IPV6_FW_F_REJECT: 1083 if (frwl->fw_reject_code >= 0x100 1084 && !(frwl->fw_prot == IPPROTO_TCP 1085 && frwl->fw_reject_code == IPV6_FW_REJECT_RST)) { 1086 dprintf(("%s unknown reject code\n", err_prefix)); 1087 return (NULL); 1088 } 1089 break; 1090 case IPV6_FW_F_DIVERT: /* Diverting to port zero is invalid */ 1091 case IPV6_FW_F_TEE: 1092 if (frwl->fw_divert_port == 0) { 1093 dprintf(("%s can't divert to port 0\n", err_prefix)); 1094 return (NULL); 1095 } 1096 break; 1097 case IPV6_FW_F_DENY: 1098 case IPV6_FW_F_ACCEPT: 1099 case IPV6_FW_F_COUNT: 1100 case IPV6_FW_F_SKIPTO: 1101 break; 1102 default: 1103 dprintf(("%s invalid command\n", err_prefix)); 1104 return (NULL); 1105 } 1106 1107 return frwl; 1108 } 1109 1110 static int 1111 ip6_fw_ctl(int stage, struct mbuf **mm) 1112 { 1113 int error; 1114 struct mbuf *m; 1115 1116 if (stage == IPV6_FW_GET) { 1117 struct ip6_fw_chain *fcp = ip6_fw_chain.lh_first; 1118 *mm = m = m_get(M_TRYWAIT, MT_DATA); /* XXX */ 1119 if (!m) 1120 return (ENOBUFS); 1121 if (sizeof *(fcp->rule) > MLEN) { 1122 MCLGET(m, M_TRYWAIT); 1123 if ((m->m_flags & M_EXT) == 0) { 1124 m_free(m); 1125 return (ENOBUFS); 1126 } 1127 } 1128 for (; fcp; fcp = fcp->chain.le_next) { 1129 bcopy(fcp->rule, m->m_data, sizeof *(fcp->rule)); 1130 m->m_len = sizeof *(fcp->rule); 1131 m->m_next = m_get(M_TRYWAIT, MT_DATA); /* XXX */ 1132 if (!m->m_next) { 1133 m_freem(*mm); 1134 return (ENOBUFS); 1135 } 1136 m = m->m_next; 1137 if (sizeof *(fcp->rule) > MLEN) { 1138 MCLGET(m, M_TRYWAIT); 1139 if ((m->m_flags & M_EXT) == 0) { 1140 m_freem(*mm); 1141 return (ENOBUFS); 1142 } 1143 } 1144 m->m_len = 0; 1145 } 1146 return (0); 1147 } 1148 m = *mm; 1149 /* only allow get calls if secure mode > 2 */ 1150 if (securelevel > 2) { 1151 if (m) { 1152 (void)m_freem(m); 1153 *mm = 0; 1154 } 1155 return (EPERM); 1156 } 1157 if (stage == IPV6_FW_FLUSH) { 1158 while (ip6_fw_chain.lh_first != NULL && 1159 ip6_fw_chain.lh_first->rule->fw_number != (u_short)-1) { 1160 struct ip6_fw_chain *fcp = ip6_fw_chain.lh_first; 1161 int s = splnet(); 1162 LIST_REMOVE(ip6_fw_chain.lh_first, chain); 1163 splx(s); 1164 free(fcp->rule, M_IP6FW); 1165 free(fcp, M_IP6FW); 1166 } 1167 if (m) { 1168 (void)m_freem(m); 1169 *mm = 0; 1170 } 1171 return (0); 1172 } 1173 if (stage == IPV6_FW_ZERO) { 1174 error = zero_entry6(m); 1175 if (m) { 1176 (void)m_freem(m); 1177 *mm = 0; 1178 } 1179 return (error); 1180 } 1181 if (m == NULL) { 1182 printf("%s NULL mbuf ptr\n", err_prefix); 1183 return (EINVAL); 1184 } 1185 1186 if (stage == IPV6_FW_ADD) { 1187 struct ip6_fw *frwl = check_ip6fw_mbuf(m); 1188 1189 if (!frwl) 1190 error = EINVAL; 1191 else 1192 error = add_entry6(&ip6_fw_chain, frwl); 1193 if (m) { 1194 (void)m_freem(m); 1195 *mm = 0; 1196 } 1197 return error; 1198 } 1199 if (stage == IPV6_FW_DEL) { 1200 if (m->m_len != sizeof(struct ip6_fw)) { 1201 dprintf(("%s len=%d, want %zu\n", err_prefix, m->m_len, 1202 sizeof(struct ip6_fw))); 1203 error = EINVAL; 1204 } else if (mtod(m, struct ip6_fw *)->fw_number == (u_short)-1) { 1205 dprintf(("%s can't delete rule 65535\n", err_prefix)); 1206 error = EINVAL; 1207 } else 1208 error = del_entry6(&ip6_fw_chain, 1209 mtod(m, struct ip6_fw *)->fw_number); 1210 if (m) { 1211 (void)m_freem(m); 1212 *mm = 0; 1213 } 1214 return error; 1215 } 1216 1217 dprintf(("%s unknown request %d\n", err_prefix, stage)); 1218 if (m) { 1219 (void)m_freem(m); 1220 *mm = 0; 1221 } 1222 return (EINVAL); 1223 } 1224 1225 void 1226 ip6_fw_init(void) 1227 { 1228 struct ip6_fw default_rule; 1229 1230 ip6_fw_chk_ptr = ip6_fw_chk; 1231 ip6_fw_ctl_ptr = ip6_fw_ctl; 1232 LIST_INIT(&ip6_fw_chain); 1233 1234 bzero(&default_rule, sizeof default_rule); 1235 default_rule.fw_prot = IPPROTO_IPV6; 1236 default_rule.fw_number = (u_short)-1; 1237 #ifdef IPV6FIREWALL_DEFAULT_TO_ACCEPT 1238 default_rule.fw_flg |= IPV6_FW_F_ACCEPT; 1239 #else 1240 default_rule.fw_flg |= IPV6_FW_F_DENY; 1241 #endif 1242 default_rule.fw_flg |= IPV6_FW_F_IN | IPV6_FW_F_OUT; 1243 if (check_ip6fw_struct(&default_rule) == NULL || 1244 add_entry6(&ip6_fw_chain, &default_rule)) 1245 panic(__FUNCTION__); 1246 1247 printf("IPv6 packet filtering initialized, "); 1248 #ifdef IPV6FIREWALL_DEFAULT_TO_ACCEPT 1249 printf("default to accept, "); 1250 #endif 1251 #ifndef IPV6FIREWALL_VERBOSE 1252 printf("logging disabled\n"); 1253 #else 1254 if (fw6_verbose_limit == 0) 1255 printf("unlimited logging\n"); 1256 else 1257 printf("logging limited to %d packets/entry\n", 1258 fw6_verbose_limit); 1259 #endif 1260 } 1261 1262 static ip6_fw_chk_t *old_chk_ptr; 1263 static ip6_fw_ctl_t *old_ctl_ptr; 1264 1265 static int 1266 ip6fw_modevent(module_t mod, int type, void *unused) 1267 { 1268 int s; 1269 1270 switch (type) { 1271 case MOD_LOAD: 1272 s = splnet(); 1273 1274 old_chk_ptr = ip6_fw_chk_ptr; 1275 old_ctl_ptr = ip6_fw_ctl_ptr; 1276 1277 ip6_fw_init(); 1278 splx(s); 1279 return 0; 1280 case MOD_UNLOAD: 1281 s = splnet(); 1282 ip6_fw_chk_ptr = old_chk_ptr; 1283 ip6_fw_ctl_ptr = old_ctl_ptr; 1284 while (LIST_FIRST(&ip6_fw_chain) != NULL) { 1285 struct ip6_fw_chain *fcp = LIST_FIRST(&ip6_fw_chain); 1286 LIST_REMOVE(LIST_FIRST(&ip6_fw_chain), chain); 1287 free(fcp->rule, M_IP6FW); 1288 free(fcp, M_IP6FW); 1289 } 1290 1291 splx(s); 1292 printf("IPv6 firewall unloaded\n"); 1293 return 0; 1294 default: 1295 break; 1296 } 1297 return 0; 1298 } 1299 1300 static moduledata_t ip6fwmod = { 1301 "ip6fw", 1302 ip6fw_modevent, 1303 0 1304 }; 1305 DECLARE_MODULE(ip6fw, ip6fwmod, SI_SUB_PSEUDO, SI_ORDER_ANY);
Cache object: 37d4da27050d274ddebf752e88d316a7
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