1 /* $FreeBSD: src/sys/netinet6/ip6_fw.c,v 1.2.2.10 2003/08/03 17:52:54 ume Exp $ */ 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/thread2.h> 75 #include <sys/time.h> 76 #include <net/if.h> 77 #include <net/route.h> 78 #include <netinet/in_systm.h> 79 #include <netinet/in.h> 80 #include <netinet/ip.h> 81 82 #include <netinet/ip6.h> 83 #include <netinet6/ip6_var.h> 84 #include <netinet6/in6_var.h> 85 #include <netinet/icmp6.h> 86 87 #include <netinet/in_pcb.h> 88 89 #include "ip6_fw.h" 90 #include <netinet/ip_var.h> 91 #include <netinet/tcp.h> 92 #include <netinet/tcp_seq.h> 93 #include <netinet/tcp_timer.h> 94 #include <netinet/tcp_var.h> 95 #include <netinet/udp.h> 96 97 #include <sys/sysctl.h> 98 99 #include <net/net_osdep.h> 100 101 MALLOC_DEFINE(M_IP6FW, "Ip6Fw/Ip6Acct", "Ip6Fw/Ip6Acct chain's"); 102 103 static int fw6_debug = 1; 104 #ifdef IPV6FIREWALL_VERBOSE 105 static int fw6_verbose = 1; 106 #else 107 static int fw6_verbose = 0; 108 #endif 109 #ifdef IPV6FIREWALL_VERBOSE_LIMIT 110 static int fw6_verbose_limit = IPV6FIREWALL_VERBOSE_LIMIT; 111 #else 112 static int fw6_verbose_limit = 0; 113 #endif 114 115 LIST_HEAD (ip6_fw_head, ip6_fw_chain) ip6_fw_chain; 116 117 #ifdef SYSCTL_NODE 118 SYSCTL_DECL(_net_inet6_ip6); 119 SYSCTL_NODE(_net_inet6_ip6, OID_AUTO, fw, CTLFLAG_RW, 0, "Firewall"); 120 SYSCTL_INT(_net_inet6_ip6_fw, OID_AUTO, enable, CTLFLAG_RW, 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, &fw6_verbose, 0, ""); 124 SYSCTL_INT(_net_inet6_ip6_fw, OID_AUTO, verbose_limit, CTLFLAG_RW, &fw6_verbose_limit, 0, ""); 125 #endif 126 127 #define dprintf(a) do { \ 128 if (fw6_debug) \ 129 kprintf a; \ 130 } while (0) 131 #define SNPARGS(buf, len) buf + len, sizeof(buf) > len ? sizeof(buf) - len : 0 132 133 static int add_entry6 (struct ip6_fw_head *chainptr, struct ip6_fw *frwl); 134 static int del_entry6 (struct ip6_fw_head *chainptr, u_short number); 135 static int zero_entry6 (struct mbuf *m); 136 static struct ip6_fw *check_ip6fw_struct (struct ip6_fw *m); 137 static struct ip6_fw *check_ip6fw_mbuf (struct mbuf *fw); 138 static int ip6opts_match (struct ip6_hdr **ip6, struct ip6_fw *f, 139 struct mbuf **m, 140 int *off, int *nxt, u_short *offset); 141 static int port_match6 (u_short *portptr, int nports, u_short port, 142 int range_flag); 143 static int tcp6flg_match (struct tcphdr *tcp6, struct ip6_fw *f); 144 static int icmp6type_match (struct icmp6_hdr * icmp, struct ip6_fw * f); 145 static void ip6fw_report (struct ip6_fw *f, struct ip6_hdr *ip6, 146 struct ifnet *rif, struct ifnet *oif, int off, int nxt); 147 148 static int ip6_fw_chk (struct ip6_hdr **pip6, 149 struct ifnet *oif, u_int16_t *cookie, struct mbuf **m); 150 static int ip6_fw_ctl (int stage, struct mbuf **mm); 151 152 static char err_prefix[] = "ip6_fw_ctl:"; 153 154 /* 155 * Returns 1 if the port is matched by the vector, 0 otherwise 156 */ 157 static __inline int 158 port_match6(u_short *portptr, int nports, u_short port, int range_flag) 159 { 160 if (!nports) 161 return 1; 162 if (range_flag) { 163 if (portptr[0] <= port && port <= portptr[1]) { 164 return 1; 165 } 166 nports -= 2; 167 portptr += 2; 168 } 169 while (nports-- > 0) { 170 if (*portptr++ == port) { 171 return 1; 172 } 173 } 174 return 0; 175 } 176 177 static int 178 tcp6flg_match(struct tcphdr *tcp6, struct ip6_fw *f) 179 { 180 u_char flg_set, flg_clr; 181 182 /* 183 * If an established connection is required, reject packets that 184 * have only SYN of RST|ACK|SYN set. Otherwise, fall through to 185 * other flag requirements. 186 */ 187 if ((f->fw_ipflg & IPV6_FW_IF_TCPEST) && 188 ((tcp6->th_flags & (IPV6_FW_TCPF_RST | IPV6_FW_TCPF_ACK | 189 IPV6_FW_TCPF_SYN)) == IPV6_FW_TCPF_SYN)) 190 return 0; 191 192 flg_set = tcp6->th_flags & f->fw_tcpf; 193 flg_clr = tcp6->th_flags & f->fw_tcpnf; 194 195 if (flg_set != f->fw_tcpf) 196 return 0; 197 if (flg_clr) 198 return 0; 199 200 return 1; 201 } 202 203 static int 204 icmp6type_match(struct icmp6_hdr *icmp6, struct ip6_fw *f) 205 { 206 int type; 207 208 if (!(f->fw_flg & IPV6_FW_F_ICMPBIT)) 209 return(1); 210 211 type = icmp6->icmp6_type; 212 213 /* check for matching type in the bitmap */ 214 if (type < IPV6_FW_ICMPTYPES_DIM * sizeof(unsigned) * 8 && 215 (f->fw_icmp6types[type / (sizeof(unsigned) * 8)] & 216 (1U << (type % (8 * sizeof(unsigned)))))) 217 return(1); 218 219 return(0); /* no match */ 220 } 221 222 static int 223 is_icmp6_query(struct ip6_hdr *ip6, int off) 224 { 225 const struct icmp6_hdr *icmp6; 226 int icmp6_type; 227 228 icmp6 = (struct icmp6_hdr *)((caddr_t)ip6 + off); 229 icmp6_type = icmp6->icmp6_type; 230 231 if (icmp6_type == ICMP6_ECHO_REQUEST || 232 icmp6_type == ICMP6_MEMBERSHIP_QUERY || 233 icmp6_type == ICMP6_WRUREQUEST || 234 icmp6_type == ICMP6_FQDN_QUERY || 235 icmp6_type == ICMP6_NI_QUERY) 236 return(1); 237 238 return(0); 239 } 240 241 static int 242 ip6opts_match(struct ip6_hdr **pip6, struct ip6_fw *f, struct mbuf **m, 243 int *off, int *nxt, u_short *offset) 244 { 245 int len; 246 struct ip6_hdr *ip6 = *pip6; 247 struct ip6_ext *ip6e; 248 u_char opts, nopts, nopts_sve; 249 250 opts = f->fw_ip6opt; 251 nopts = nopts_sve = f->fw_ip6nopt; 252 253 *nxt = ip6->ip6_nxt; 254 *off = sizeof(struct ip6_hdr); 255 len = ntohs(ip6->ip6_plen) + sizeof(struct ip6_hdr); 256 while (*off < len) { 257 ip6e = (struct ip6_ext *)((caddr_t) ip6 + *off); 258 if ((*m)->m_len < *off + sizeof(*ip6e)) 259 goto opts_check; /* XXX */ 260 261 switch (*nxt) { 262 case IPPROTO_FRAGMENT: 263 if ((*m)->m_len >= *off + sizeof(struct ip6_frag)) { 264 struct ip6_frag *ip6f; 265 266 ip6f = (struct ip6_frag *) ((caddr_t)ip6 + *off); 267 *offset = ip6f->ip6f_offlg & IP6F_OFF_MASK; 268 } 269 opts &= ~IPV6_FW_IP6OPT_FRAG; 270 nopts &= ~IPV6_FW_IP6OPT_FRAG; 271 *off += sizeof(struct ip6_frag); 272 break; 273 case IPPROTO_AH: 274 opts &= ~IPV6_FW_IP6OPT_AH; 275 nopts &= ~IPV6_FW_IP6OPT_AH; 276 *off += (ip6e->ip6e_len + 2) << 2; 277 break; 278 default: 279 switch (*nxt) { 280 case IPPROTO_HOPOPTS: 281 opts &= ~IPV6_FW_IP6OPT_HOPOPT; 282 nopts &= ~IPV6_FW_IP6OPT_HOPOPT; 283 break; 284 case IPPROTO_ROUTING: 285 opts &= ~IPV6_FW_IP6OPT_ROUTE; 286 nopts &= ~IPV6_FW_IP6OPT_ROUTE; 287 break; 288 case IPPROTO_ESP: 289 opts &= ~IPV6_FW_IP6OPT_ESP; 290 nopts &= ~IPV6_FW_IP6OPT_ESP; 291 goto opts_check; 292 case IPPROTO_NONE: 293 opts &= ~IPV6_FW_IP6OPT_NONXT; 294 nopts &= ~IPV6_FW_IP6OPT_NONXT; 295 goto opts_check; 296 case IPPROTO_DSTOPTS: 297 opts &= ~IPV6_FW_IP6OPT_OPTS; 298 nopts &= ~IPV6_FW_IP6OPT_OPTS; 299 break; 300 default: 301 goto opts_check; 302 } 303 *off += (ip6e->ip6e_len + 1) << 3; 304 break; 305 } 306 *nxt = ip6e->ip6e_nxt; 307 308 } 309 opts_check: 310 if (f->fw_ip6opt == f->fw_ip6nopt) /* XXX */ 311 return 1; 312 313 if (opts == 0 && nopts == nopts_sve) 314 return 1; 315 else 316 return 0; 317 } 318 319 static __inline int 320 iface_match(struct ifnet *ifp, union ip6_fw_if *ifu, int byname) 321 { 322 /* Check by name or by IP address */ 323 if (byname) { 324 /* Check name */ 325 if (ifu->fu_via_if.glob) { 326 if (kfnmatch(ifu->fu_via_if.name, ifp->if_xname, 0) 327 == FNM_NOMATCH) 328 return(0); 329 } else { 330 if (strncmp(ifp->if_xname, ifu->fu_via_if.name, 331 IP6FW_IFNLEN) != 0) 332 return(0); 333 } 334 return(1); 335 } else if (!IN6_IS_ADDR_UNSPECIFIED(&ifu->fu_via_ip6)) { /* Zero == wildcard */ 336 struct ifaddr_container *ifac; 337 338 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) { 339 struct ifaddr *ifa = ifac->ifa; 340 341 if (ifa->ifa_addr == NULL) 342 continue; 343 if (ifa->ifa_addr->sa_family != AF_INET6) 344 continue; 345 if (!IN6_ARE_ADDR_EQUAL(&ifu->fu_via_ip6, 346 &(((struct sockaddr_in6 *) 347 (ifa->ifa_addr))->sin6_addr))) 348 continue; 349 return(1); 350 } 351 return(0); 352 } 353 return(1); 354 } 355 356 static void 357 ip6fw_report(struct ip6_fw *f, struct ip6_hdr *ip6, 358 struct ifnet *rif, struct ifnet *oif, int off, int nxt) 359 { 360 static int counter; 361 struct tcphdr *const tcp6 = (struct tcphdr *) ((caddr_t) ip6+ off); 362 struct udphdr *const udp = (struct udphdr *) ((caddr_t) ip6+ off); 363 struct icmp6_hdr *const icmp6 = (struct icmp6_hdr *) ((caddr_t) ip6+ off); 364 int count; 365 char *action; 366 char action2[32], proto[102], name[18]; 367 int len; 368 369 count = f ? f->fw_pcnt : ++counter; 370 if (fw6_verbose_limit != 0 && count > fw6_verbose_limit) 371 return; 372 373 /* Print command name */ 374 ksnprintf(SNPARGS(name, 0), "ip6fw: %d", f ? f->fw_number : -1); 375 376 action = action2; 377 if (!f) 378 action = "Refuse"; 379 else { 380 switch (f->fw_flg & IPV6_FW_F_COMMAND) { 381 case IPV6_FW_F_DENY: 382 action = "Deny"; 383 break; 384 case IPV6_FW_F_REJECT: 385 if (f->fw_reject_code == IPV6_FW_REJECT_RST) 386 action = "Reset"; 387 else 388 action = "Unreach"; 389 break; 390 case IPV6_FW_F_ACCEPT: 391 action = "Accept"; 392 break; 393 case IPV6_FW_F_COUNT: 394 action = "Count"; 395 break; 396 case IPV6_FW_F_DIVERT: 397 ksnprintf(SNPARGS(action2, 0), "Divert %d", 398 f->fw_divert_port); 399 break; 400 case IPV6_FW_F_TEE: 401 ksnprintf(SNPARGS(action2, 0), "Tee %d", 402 f->fw_divert_port); 403 break; 404 case IPV6_FW_F_SKIPTO: 405 ksnprintf(SNPARGS(action2, 0), "SkipTo %d", 406 f->fw_skipto_rule); 407 break; 408 default: 409 action = "UNKNOWN"; 410 break; 411 } 412 } 413 414 switch (nxt) { 415 case IPPROTO_TCP: 416 len = ksnprintf(SNPARGS(proto, 0), "TCP [%s]", 417 ip6_sprintf(&ip6->ip6_src)); 418 if (off > 0) 419 len += ksnprintf(SNPARGS(proto, len), ":%d ", 420 ntohs(tcp6->th_sport)); 421 else 422 len += ksnprintf(SNPARGS(proto, len), " "); 423 len += ksnprintf(SNPARGS(proto, len), "[%s]", 424 ip6_sprintf(&ip6->ip6_dst)); 425 if (off > 0) 426 ksnprintf(SNPARGS(proto, len), ":%d", 427 ntohs(tcp6->th_dport)); 428 break; 429 case IPPROTO_UDP: 430 len = ksnprintf(SNPARGS(proto, 0), "UDP [%s]", 431 ip6_sprintf(&ip6->ip6_src)); 432 if (off > 0) 433 len += ksnprintf(SNPARGS(proto, len), ":%d ", 434 ntohs(udp->uh_sport)); 435 else 436 len += ksnprintf(SNPARGS(proto, len), " "); 437 len += ksnprintf(SNPARGS(proto, len), "[%s]", 438 ip6_sprintf(&ip6->ip6_dst)); 439 if (off > 0) 440 ksnprintf(SNPARGS(proto, len), ":%d", 441 ntohs(udp->uh_dport)); 442 break; 443 case IPPROTO_ICMPV6: 444 if (off > 0) 445 len = ksnprintf(SNPARGS(proto, 0), "IPV6-ICMP:%u.%u ", 446 icmp6->icmp6_type, icmp6->icmp6_code); 447 else 448 len = ksnprintf(SNPARGS(proto, 0), "IPV6-ICMP "); 449 len += ksnprintf(SNPARGS(proto, len), "[%s]", 450 ip6_sprintf(&ip6->ip6_src)); 451 ksnprintf(SNPARGS(proto, len), " [%s]", 452 ip6_sprintf(&ip6->ip6_dst)); 453 break; 454 default: 455 len = ksnprintf(SNPARGS(proto, 0), "P:%d [%s]", nxt, 456 ip6_sprintf(&ip6->ip6_src)); 457 ksnprintf(SNPARGS(proto, len), " [%s]", 458 ip6_sprintf(&ip6->ip6_dst)); 459 break; 460 } 461 462 if (oif) 463 log(LOG_SECURITY | LOG_INFO, "%s %s %s out via %s\n", 464 name, action, proto, if_name(oif)); 465 else if (rif) 466 log(LOG_SECURITY | LOG_INFO, "%s %s %s in via %s\n", 467 name, action, proto, if_name(rif)); 468 else 469 log(LOG_SECURITY | LOG_INFO, "%s %s %s", 470 name, action, proto); 471 if (fw6_verbose_limit != 0 && count == fw6_verbose_limit) 472 log(LOG_SECURITY | LOG_INFO, "ip6fw: limit reached on entry %d\n", 473 f ? f->fw_number : -1); 474 } 475 476 /* 477 * Parameters: 478 * 479 * ip Pointer to packet header (struct ip6_hdr *) 480 * hlen Packet header length 481 * oif Outgoing interface, or NULL if packet is incoming 482 * #ifndef IP6FW_DIVERT_RESTART 483 * *cookie Ignore all divert/tee rules to this port (if non-zero) 484 * #else 485 * *cookie Skip up to the first rule past this rule number; 486 * #endif 487 * *m The packet; we set to NULL when/if we nuke it. 488 * 489 * Return value: 490 * 491 * 0 The packet is to be accepted and routed normally OR 492 * the packet was denied/rejected and has been dropped; 493 * in the latter case, *m is equal to NULL upon return. 494 * port Divert the packet to port. 495 */ 496 497 static int 498 ip6_fw_chk(struct ip6_hdr **pip6, 499 struct ifnet *oif, u_int16_t *cookie, struct mbuf **m) 500 { 501 struct ip6_fw_chain *chain; 502 struct ip6_fw *rule = NULL; 503 struct ip6_hdr *ip6 = *pip6; 504 struct ifnet *const rif = (*m)->m_pkthdr.rcvif; 505 u_short offset = 0; 506 int off = sizeof(struct ip6_hdr), nxt = ip6->ip6_nxt; 507 u_short src_port, dst_port; 508 #ifdef IP6FW_DIVERT_RESTART 509 u_int16_t skipto = *cookie; 510 #else 511 u_int16_t ignport = ntohs(*cookie); 512 #endif 513 514 *cookie = 0; 515 /* 516 * Go down the chain, looking for enlightment 517 * #ifdef IP6FW_DIVERT_RESTART 518 * If we've been asked to start at a given rule immediatly, do so. 519 * #endif 520 */ 521 chain = LIST_FIRST(&ip6_fw_chain); 522 #ifdef IP6FW_DIVERT_RESTART 523 if (skipto) { 524 if (skipto >= 65535) 525 goto dropit; 526 while (chain && (chain->rule->fw_number <= skipto)) { 527 chain = LIST_NEXT(chain, chain); 528 } 529 if (! chain) goto dropit; 530 } 531 #endif /* IP6FW_DIVERT_RESTART */ 532 for (; chain; chain = LIST_NEXT(chain, chain)) { 533 struct ip6_fw *const f = chain->rule; 534 535 if (oif) { 536 /* Check direction outbound */ 537 if (!(f->fw_flg & IPV6_FW_F_OUT)) 538 continue; 539 } else { 540 /* Check direction inbound */ 541 if (!(f->fw_flg & IPV6_FW_F_IN)) 542 continue; 543 } 544 545 #define IN6_ARE_ADDR_MASKEQUAL(x,y,z) (\ 546 (((x)->s6_addr32[0] & (y)->s6_addr32[0]) == (z)->s6_addr32[0]) && \ 547 (((x)->s6_addr32[1] & (y)->s6_addr32[1]) == (z)->s6_addr32[1]) && \ 548 (((x)->s6_addr32[2] & (y)->s6_addr32[2]) == (z)->s6_addr32[2]) && \ 549 (((x)->s6_addr32[3] & (y)->s6_addr32[3]) == (z)->s6_addr32[3])) 550 551 /* If src-addr doesn't match, not this rule. */ 552 if (((f->fw_flg & IPV6_FW_F_INVSRC) != 0) ^ 553 (!IN6_ARE_ADDR_MASKEQUAL(&ip6->ip6_src,&f->fw_smsk,&f->fw_src))) 554 continue; 555 556 /* If dest-addr doesn't match, not this rule. */ 557 if (((f->fw_flg & IPV6_FW_F_INVDST) != 0) ^ 558 (!IN6_ARE_ADDR_MASKEQUAL(&ip6->ip6_dst,&f->fw_dmsk,&f->fw_dst))) 559 continue; 560 561 #undef IN6_ARE_ADDR_MASKEQUAL 562 /* Interface check */ 563 if ((f->fw_flg & IF6_FW_F_VIAHACK) == IF6_FW_F_VIAHACK) { 564 struct ifnet *const iface = oif ? oif : rif; 565 566 /* Backwards compatibility hack for "via" */ 567 if (!iface || !iface_match(iface, 568 &f->fw_in_if, f->fw_flg & IPV6_FW_F_OIFNAME)) 569 continue; 570 } else { 571 /* Check receive interface */ 572 if ((f->fw_flg & IPV6_FW_F_IIFACE) 573 && (!rif || !iface_match(rif, 574 &f->fw_in_if, f->fw_flg & IPV6_FW_F_IIFNAME))) 575 continue; 576 /* Check outgoing interface */ 577 if ((f->fw_flg & IPV6_FW_F_OIFACE) 578 && (!oif || !iface_match(oif, 579 &f->fw_out_if, f->fw_flg & IPV6_FW_F_OIFNAME))) 580 continue; 581 } 582 583 /* Check IP options */ 584 if (!ip6opts_match(&ip6, f, m, &off, &nxt, &offset)) 585 continue; 586 587 /* Fragments */ 588 if ((f->fw_flg & IPV6_FW_F_FRAG) && !offset) 589 continue; 590 591 /* Check protocol; if wildcard, match */ 592 if (f->fw_prot == IPPROTO_IPV6) 593 goto got_match; 594 595 /* If different, don't match */ 596 if (nxt != f->fw_prot) 597 continue; 598 599 #define PULLUP_TO(len) do { \ 600 if ((*m)->m_len < (len) \ 601 && (*m = m_pullup(*m, (len))) == NULL) {\ 602 goto dropit; \ 603 } \ 604 *pip6 = ip6 = mtod(*m, struct ip6_hdr *); \ 605 } while (0) 606 607 /* Protocol specific checks */ 608 switch (nxt) { 609 case IPPROTO_TCP: 610 { 611 struct tcphdr *tcp6; 612 613 if (offset == 1) { /* cf. RFC 1858 */ 614 PULLUP_TO(off + 4); /* XXX ? */ 615 goto bogusfrag; 616 } 617 if (offset != 0) { 618 /* 619 * TCP flags and ports aren't available in this 620 * packet -- if this rule specified either one, 621 * we consider the rule a non-match. 622 */ 623 if (f->fw_nports != 0 || 624 f->fw_tcpf != f->fw_tcpnf) 625 continue; 626 627 break; 628 } 629 PULLUP_TO(off + 14); 630 tcp6 = (struct tcphdr *) ((caddr_t)ip6 + off); 631 if (((f->fw_tcpf != f->fw_tcpnf) || 632 (f->fw_ipflg & IPV6_FW_IF_TCPEST)) && 633 !tcp6flg_match(tcp6, f)) 634 continue; 635 src_port = ntohs(tcp6->th_sport); 636 dst_port = ntohs(tcp6->th_dport); 637 goto check_ports; 638 } 639 640 case IPPROTO_UDP: 641 { 642 struct udphdr *udp; 643 644 if (offset != 0) { 645 /* 646 * Port specification is unavailable -- if this 647 * rule specifies a port, we consider the rule 648 * a non-match. 649 */ 650 if (f->fw_nports != 0) 651 continue; 652 653 break; 654 } 655 PULLUP_TO(off + 4); 656 udp = (struct udphdr *) ((caddr_t)ip6 + off); 657 src_port = ntohs(udp->uh_sport); 658 dst_port = ntohs(udp->uh_dport); 659 check_ports: 660 if (!port_match6(&f->fw_pts[0], 661 IPV6_FW_GETNSRCP(f), src_port, 662 f->fw_flg & IPV6_FW_F_SRNG)) 663 continue; 664 if (!port_match6(&f->fw_pts[IPV6_FW_GETNSRCP(f)], 665 IPV6_FW_GETNDSTP(f), dst_port, 666 f->fw_flg & IPV6_FW_F_DRNG)) 667 continue; 668 break; 669 } 670 671 case IPPROTO_ICMPV6: 672 { 673 struct icmp6_hdr *icmp; 674 675 if (offset != 0) /* Type isn't valid */ 676 break; 677 PULLUP_TO(off + 2); 678 icmp = (struct icmp6_hdr *) ((caddr_t)ip6 + off); 679 if (!icmp6type_match(icmp, f)) 680 continue; 681 break; 682 } 683 #undef PULLUP_TO 684 685 bogusfrag: 686 if (fw6_verbose) 687 ip6fw_report(NULL, ip6, rif, oif, off, nxt); 688 goto dropit; 689 } 690 691 got_match: 692 #ifndef IP6FW_DIVERT_RESTART 693 /* Ignore divert/tee rule if socket port is "ignport" */ 694 switch (f->fw_flg & IPV6_FW_F_COMMAND) { 695 case IPV6_FW_F_DIVERT: 696 case IPV6_FW_F_TEE: 697 if (f->fw_divert_port == ignport) 698 continue; /* ignore this rule */ 699 break; 700 } 701 702 #endif /* IP6FW_DIVERT_RESTART */ 703 /* Update statistics */ 704 f->fw_pcnt += 1; 705 f->fw_bcnt += ntohs(ip6->ip6_plen); 706 f->timestamp = time_second; 707 708 /* Log to console if desired */ 709 if ((f->fw_flg & IPV6_FW_F_PRN) && fw6_verbose) 710 ip6fw_report(f, ip6, rif, oif, off, nxt); 711 712 /* Take appropriate action */ 713 switch (f->fw_flg & IPV6_FW_F_COMMAND) { 714 case IPV6_FW_F_ACCEPT: 715 return(0); 716 case IPV6_FW_F_COUNT: 717 continue; 718 case IPV6_FW_F_DIVERT: 719 #ifdef IP6FW_DIVERT_RESTART 720 *cookie = f->fw_number; 721 #else 722 *cookie = htons(f->fw_divert_port); 723 #endif /* IP6FW_DIVERT_RESTART */ 724 return(f->fw_divert_port); 725 case IPV6_FW_F_TEE: 726 /* 727 * XXX someday tee packet here, but beware that you 728 * can't use m_copym() or m_copypacket() because 729 * the divert input routine modifies the mbuf 730 * (and these routines only increment reference 731 * counts in the case of mbuf clusters), so need 732 * to write custom routine. 733 */ 734 continue; 735 case IPV6_FW_F_SKIPTO: 736 #ifdef DIAGNOSTIC 737 while (chain->chain.le_next 738 && chain->chain.le_next->rule->fw_number 739 < f->fw_skipto_rule) 740 #else 741 while (chain->chain.le_next->rule->fw_number 742 < f->fw_skipto_rule) 743 #endif 744 chain = chain->chain.le_next; 745 continue; 746 } 747 748 /* Deny/reject this packet using this rule */ 749 rule = f; 750 break; 751 } 752 753 #ifdef DIAGNOSTIC 754 /* Rule 65535 should always be there and should always match */ 755 if (!chain) 756 panic("ip6_fw: chain"); 757 #endif 758 759 /* 760 * At this point, we're going to drop the packet. 761 * Send a reject notice if all of the following are true: 762 * 763 * - The packet matched a reject rule 764 * - The packet is not an ICMP packet, or is an ICMP query packet 765 * - The packet is not a multicast or broadcast packet 766 */ 767 if ((rule->fw_flg & IPV6_FW_F_COMMAND) == IPV6_FW_F_REJECT 768 && (nxt != IPPROTO_ICMPV6 || is_icmp6_query(ip6, off)) 769 && !((*m)->m_flags & (M_BCAST|M_MCAST)) 770 && !IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 771 switch (rule->fw_reject_code) { 772 case IPV6_FW_REJECT_RST: 773 #if 1 /* not tested */ 774 { 775 struct tcphdr *const tcp = 776 (struct tcphdr *) ((caddr_t)ip6 + off); 777 struct { 778 struct ip6_hdr ip6; 779 struct tcphdr th; 780 } ti; 781 tcp_seq ack, seq; 782 int flags; 783 784 if (offset != 0 || (tcp->th_flags & TH_RST)) 785 break; 786 787 ti.ip6 = *ip6; 788 ti.th = *tcp; 789 ti.th.th_seq = ntohl(ti.th.th_seq); 790 ti.th.th_ack = ntohl(ti.th.th_ack); 791 ti.ip6.ip6_nxt = IPPROTO_TCP; 792 if (ti.th.th_flags & TH_ACK) { 793 ack = 0; 794 seq = ti.th.th_ack; 795 flags = TH_RST; 796 } else { 797 ack = ti.th.th_seq; 798 if (((*m)->m_flags & M_PKTHDR) != 0) { 799 ack += (*m)->m_pkthdr.len - off 800 - (ti.th.th_off << 2); 801 } else if (ip6->ip6_plen) { 802 ack += ntohs(ip6->ip6_plen) + sizeof(*ip6) 803 - off - (ti.th.th_off << 2); 804 } else { 805 m_freem(*m); 806 *m = NULL; 807 break; 808 } 809 seq = 0; 810 flags = TH_RST|TH_ACK; 811 } 812 bcopy(&ti, ip6, sizeof(ti)); 813 tcp_respond(NULL, ip6, (struct tcphdr *)(ip6 + 1), 814 *m, ack, seq, flags); 815 *m = NULL; 816 break; 817 } 818 #endif 819 default: /* Send an ICMP unreachable using code */ 820 if (oif) 821 (*m)->m_pkthdr.rcvif = oif; 822 icmp6_error(*m, ICMP6_DST_UNREACH, 823 rule->fw_reject_code, 0); 824 *m = NULL; 825 break; 826 } 827 } 828 829 dropit: 830 /* 831 * Finally, drop the packet. 832 */ 833 if (*m) { 834 m_freem(*m); 835 *m = NULL; 836 } 837 return(0); 838 } 839 840 static int 841 add_entry6(struct ip6_fw_head *chainptr, struct ip6_fw *frwl) 842 { 843 struct ip6_fw *ftmp = NULL; 844 struct ip6_fw_chain *fwc = NULL, *fcp, *fcpl = NULL; 845 u_short nbr = 0; 846 847 fwc = kmalloc(sizeof *fwc, M_IP6FW, M_INTWAIT); 848 ftmp = kmalloc(sizeof *ftmp, M_IP6FW, M_INTWAIT); 849 850 bcopy(frwl, ftmp, sizeof(struct ip6_fw)); 851 ftmp->fw_in_if.fu_via_if.name[IP6FW_IFNLEN - 1] = '\0'; 852 ftmp->fw_pcnt = 0L; 853 ftmp->fw_bcnt = 0L; 854 fwc->rule = ftmp; 855 856 crit_enter(); 857 858 if (!chainptr->lh_first) { 859 LIST_INSERT_HEAD(chainptr, fwc, chain); 860 crit_exit(); 861 return(0); 862 } else if (ftmp->fw_number == (u_short)-1) { 863 if (fwc) kfree(fwc, M_IP6FW); 864 if (ftmp) kfree(ftmp, M_IP6FW); 865 crit_exit(); 866 dprintf(("%s bad rule number\n", err_prefix)); 867 return (EINVAL); 868 } 869 870 /* If entry number is 0, find highest numbered rule and add 100 */ 871 if (ftmp->fw_number == 0) { 872 LIST_FOREACH(fcp, chainptr, chain) { 873 if (fcp->rule->fw_number != (u_short)-1) 874 nbr = fcp->rule->fw_number; 875 else 876 break; 877 } 878 if (nbr < (u_short)-1 - 100) 879 nbr += 100; 880 ftmp->fw_number = nbr; 881 } 882 883 /* Got a valid number; now insert it, keeping the list ordered */ 884 LIST_FOREACH(fcp, chainptr, chain) { 885 if (fcp->rule->fw_number > ftmp->fw_number) { 886 if (fcpl) { 887 LIST_INSERT_AFTER(fcpl, fwc, chain); 888 } else { 889 LIST_INSERT_HEAD(chainptr, fwc, chain); 890 } 891 break; 892 } else { 893 fcpl = fcp; 894 } 895 } 896 897 crit_exit(); 898 return (0); 899 } 900 901 static int 902 del_entry6(struct ip6_fw_head *chainptr, u_short number) 903 { 904 struct ip6_fw_chain *fcp; 905 906 crit_enter(); 907 908 fcp = chainptr->lh_first; 909 if (number != (u_short)-1) { 910 for (; fcp; fcp = fcp->chain.le_next) { 911 if (fcp->rule->fw_number == number) { 912 LIST_REMOVE(fcp, chain); 913 crit_exit(); 914 kfree(fcp->rule, M_IP6FW); 915 kfree(fcp, M_IP6FW); 916 return 0; 917 } 918 } 919 } 920 921 crit_exit(); 922 return (EINVAL); 923 } 924 925 static int 926 zero_entry6(struct mbuf *m) 927 { 928 struct ip6_fw *frwl; 929 struct ip6_fw_chain *fcp; 930 931 if (m && m->m_len != 0) { 932 if (m->m_len != sizeof(struct ip6_fw)) 933 return(EINVAL); 934 frwl = mtod(m, struct ip6_fw *); 935 } 936 else 937 frwl = NULL; 938 939 /* 940 * It's possible to insert multiple chain entries with the 941 * same number, so we don't stop after finding the first 942 * match if zeroing a specific entry. 943 */ 944 crit_enter(); 945 for (fcp = ip6_fw_chain.lh_first; fcp; fcp = fcp->chain.le_next) 946 if (!frwl || frwl->fw_number == fcp->rule->fw_number) { 947 fcp->rule->fw_bcnt = fcp->rule->fw_pcnt = 0; 948 fcp->rule->timestamp = 0; 949 } 950 crit_exit(); 951 952 if (fw6_verbose) { 953 if (frwl) 954 log(LOG_SECURITY | LOG_NOTICE, 955 "ip6fw: Entry %d cleared.\n", frwl->fw_number); 956 else 957 log(LOG_SECURITY | LOG_NOTICE, 958 "ip6fw: Accounting cleared.\n"); 959 } 960 961 return(0); 962 } 963 964 static struct ip6_fw * 965 check_ip6fw_mbuf(struct mbuf *m) 966 { 967 /* Check length */ 968 if (m->m_len != sizeof(struct ip6_fw)) { 969 dprintf(("%s len=%d, want %d\n", err_prefix, m->m_len, 970 (int)sizeof(struct ip6_fw))); 971 return (NULL); 972 } 973 return(check_ip6fw_struct(mtod(m, struct ip6_fw *))); 974 } 975 976 static struct ip6_fw * 977 check_ip6fw_struct(struct ip6_fw *frwl) 978 { 979 /* Check for invalid flag bits */ 980 if ((frwl->fw_flg & ~IPV6_FW_F_MASK) != 0) { 981 dprintf(("%s undefined flag bits set (flags=%x)\n", 982 err_prefix, frwl->fw_flg)); 983 return (NULL); 984 } 985 /* Must apply to incoming or outgoing (or both) */ 986 if (!(frwl->fw_flg & (IPV6_FW_F_IN | IPV6_FW_F_OUT))) { 987 dprintf(("%s neither in nor out\n", err_prefix)); 988 return (NULL); 989 } 990 /* Empty interface name is no good */ 991 if (((frwl->fw_flg & IPV6_FW_F_IIFNAME) 992 && !*frwl->fw_in_if.fu_via_if.name) 993 || ((frwl->fw_flg & IPV6_FW_F_OIFNAME) 994 && !*frwl->fw_out_if.fu_via_if.name)) { 995 dprintf(("%s empty interface name\n", err_prefix)); 996 return (NULL); 997 } 998 /* Sanity check interface matching */ 999 if ((frwl->fw_flg & IF6_FW_F_VIAHACK) == IF6_FW_F_VIAHACK) { 1000 ; /* allow "via" backwards compatibility */ 1001 } else if ((frwl->fw_flg & IPV6_FW_F_IN) 1002 && (frwl->fw_flg & IPV6_FW_F_OIFACE)) { 1003 dprintf(("%s outgoing interface check on incoming\n", 1004 err_prefix)); 1005 return (NULL); 1006 } 1007 /* Sanity check port ranges */ 1008 if ((frwl->fw_flg & IPV6_FW_F_SRNG) && IPV6_FW_GETNSRCP(frwl) < 2) { 1009 dprintf(("%s src range set but n_src_p=%d\n", 1010 err_prefix, IPV6_FW_GETNSRCP(frwl))); 1011 return (NULL); 1012 } 1013 if ((frwl->fw_flg & IPV6_FW_F_DRNG) && IPV6_FW_GETNDSTP(frwl) < 2) { 1014 dprintf(("%s dst range set but n_dst_p=%d\n", 1015 err_prefix, IPV6_FW_GETNDSTP(frwl))); 1016 return (NULL); 1017 } 1018 if (IPV6_FW_GETNSRCP(frwl) + IPV6_FW_GETNDSTP(frwl) > IPV6_FW_MAX_PORTS) { 1019 dprintf(("%s too many ports (%d+%d)\n", 1020 err_prefix, IPV6_FW_GETNSRCP(frwl), IPV6_FW_GETNDSTP(frwl))); 1021 return (NULL); 1022 } 1023 /* 1024 * Protocols other than TCP/UDP don't use port range 1025 */ 1026 if ((frwl->fw_prot != IPPROTO_TCP) && 1027 (frwl->fw_prot != IPPROTO_UDP) && 1028 (IPV6_FW_GETNSRCP(frwl) || IPV6_FW_GETNDSTP(frwl))) { 1029 dprintf(("%s port(s) specified for non TCP/UDP rule\n", 1030 err_prefix)); 1031 return(NULL); 1032 } 1033 1034 /* 1035 * Rather than modify the entry to make such entries work, 1036 * we reject this rule and require user level utilities 1037 * to enforce whatever policy they deem appropriate. 1038 */ 1039 if ((frwl->fw_src.s6_addr32[0] & (~frwl->fw_smsk.s6_addr32[0])) || 1040 (frwl->fw_src.s6_addr32[1] & (~frwl->fw_smsk.s6_addr32[1])) || 1041 (frwl->fw_src.s6_addr32[2] & (~frwl->fw_smsk.s6_addr32[2])) || 1042 (frwl->fw_src.s6_addr32[3] & (~frwl->fw_smsk.s6_addr32[3])) || 1043 (frwl->fw_dst.s6_addr32[0] & (~frwl->fw_dmsk.s6_addr32[0])) || 1044 (frwl->fw_dst.s6_addr32[1] & (~frwl->fw_dmsk.s6_addr32[1])) || 1045 (frwl->fw_dst.s6_addr32[2] & (~frwl->fw_dmsk.s6_addr32[2])) || 1046 (frwl->fw_dst.s6_addr32[3] & (~frwl->fw_dmsk.s6_addr32[3]))) { 1047 dprintf(("%s rule never matches\n", err_prefix)); 1048 return(NULL); 1049 } 1050 1051 if ((frwl->fw_flg & IPV6_FW_F_FRAG) && 1052 (frwl->fw_prot == IPPROTO_UDP || frwl->fw_prot == IPPROTO_TCP)) { 1053 if (frwl->fw_nports) { 1054 dprintf(("%s cannot mix 'frag' and ports\n", err_prefix)); 1055 return(NULL); 1056 } 1057 if (frwl->fw_prot == IPPROTO_TCP && 1058 frwl->fw_tcpf != frwl->fw_tcpnf) { 1059 dprintf(("%s cannot mix 'frag' with TCP flags\n", err_prefix)); 1060 return(NULL); 1061 } 1062 } 1063 1064 /* Check command specific stuff */ 1065 switch (frwl->fw_flg & IPV6_FW_F_COMMAND) 1066 { 1067 case IPV6_FW_F_REJECT: 1068 if (frwl->fw_reject_code >= 0x100 1069 && !(frwl->fw_prot == IPPROTO_TCP 1070 && frwl->fw_reject_code == IPV6_FW_REJECT_RST)) { 1071 dprintf(("%s unknown reject code\n", err_prefix)); 1072 return(NULL); 1073 } 1074 break; 1075 case IPV6_FW_F_DIVERT: /* Diverting to port zero is invalid */ 1076 case IPV6_FW_F_TEE: 1077 if (frwl->fw_divert_port == 0) { 1078 dprintf(("%s can't divert to port 0\n", err_prefix)); 1079 return (NULL); 1080 } 1081 break; 1082 case IPV6_FW_F_DENY: 1083 case IPV6_FW_F_ACCEPT: 1084 case IPV6_FW_F_COUNT: 1085 case IPV6_FW_F_SKIPTO: 1086 break; 1087 default: 1088 dprintf(("%s invalid command\n", err_prefix)); 1089 return(NULL); 1090 } 1091 1092 return frwl; 1093 } 1094 1095 static int 1096 ip6_fw_ctl(int stage, struct mbuf **mm) 1097 { 1098 int error; 1099 struct mbuf *m; 1100 1101 if (stage == IPV6_FW_GET) { 1102 struct ip6_fw_chain *fcp = ip6_fw_chain.lh_first; 1103 *mm = m = m_get(M_WAITOK, MT_DATA); /* XXX */ 1104 if (sizeof *(fcp->rule) > MLEN) 1105 MCLGET(m, M_WAITOK); 1106 for (; fcp; fcp = fcp->chain.le_next) { 1107 bcopy(fcp->rule, m->m_data, sizeof *(fcp->rule)); 1108 m->m_len = sizeof *(fcp->rule); 1109 m->m_next = m_get(M_WAITOK, MT_DATA); /* XXX */ 1110 m = m->m_next; 1111 if (sizeof *(fcp->rule) > MLEN) 1112 MCLGET(m, M_WAITOK); 1113 m->m_len = 0; 1114 } 1115 return (0); 1116 } 1117 m = *mm; 1118 /* only allow get calls if secure mode > 2 */ 1119 if (securelevel > 2) { 1120 if (m) { 1121 m_freem(m); 1122 *mm = NULL; 1123 } 1124 return(EPERM); 1125 } 1126 if (stage == IPV6_FW_FLUSH) { 1127 while (ip6_fw_chain.lh_first != NULL && 1128 ip6_fw_chain.lh_first->rule->fw_number != (u_short)-1) { 1129 struct ip6_fw_chain *fcp = ip6_fw_chain.lh_first; 1130 crit_enter(); 1131 LIST_REMOVE(ip6_fw_chain.lh_first, chain); 1132 crit_exit(); 1133 kfree(fcp->rule, M_IP6FW); 1134 kfree(fcp, M_IP6FW); 1135 } 1136 if (m) { 1137 m_freem(m); 1138 *mm = NULL; 1139 } 1140 return (0); 1141 } 1142 if (stage == IPV6_FW_ZERO) { 1143 error = zero_entry6(m); 1144 if (m) { 1145 m_freem(m); 1146 *mm = NULL; 1147 } 1148 return (error); 1149 } 1150 if (m == NULL) { 1151 kprintf("%s NULL mbuf ptr\n", err_prefix); 1152 return (EINVAL); 1153 } 1154 1155 if (stage == IPV6_FW_ADD) { 1156 struct ip6_fw *frwl = check_ip6fw_mbuf(m); 1157 1158 if (!frwl) 1159 error = EINVAL; 1160 else 1161 error = add_entry6(&ip6_fw_chain, frwl); 1162 if (m) { 1163 m_freem(m); 1164 *mm = NULL; 1165 } 1166 return error; 1167 } 1168 if (stage == IPV6_FW_DEL) { 1169 if (m->m_len != sizeof(struct ip6_fw)) { 1170 dprintf(("%s len=%d, want %d\n", err_prefix, m->m_len, 1171 (int)sizeof(struct ip6_fw))); 1172 error = EINVAL; 1173 } else if (mtod(m, struct ip6_fw *)->fw_number == (u_short)-1) { 1174 dprintf(("%s can't delete rule 65535\n", err_prefix)); 1175 error = EINVAL; 1176 } else 1177 error = del_entry6(&ip6_fw_chain, 1178 mtod(m, struct ip6_fw *)->fw_number); 1179 if (m) { 1180 m_freem(m); 1181 *mm = NULL; 1182 } 1183 return error; 1184 } 1185 1186 dprintf(("%s unknown request %d\n", err_prefix, stage)); 1187 if (m) { 1188 m_freem(m); 1189 *mm = NULL; 1190 } 1191 return (EINVAL); 1192 } 1193 1194 void 1195 ip6_fw_init(void) 1196 { 1197 struct ip6_fw default_rule; 1198 1199 ip6_fw_chk_ptr = ip6_fw_chk; 1200 ip6_fw_ctl_ptr = ip6_fw_ctl; 1201 LIST_INIT(&ip6_fw_chain); 1202 1203 bzero(&default_rule, sizeof default_rule); 1204 default_rule.fw_prot = IPPROTO_IPV6; 1205 default_rule.fw_number = (u_short)-1; 1206 #ifdef IPV6FIREWALL_DEFAULT_TO_ACCEPT 1207 default_rule.fw_flg |= IPV6_FW_F_ACCEPT; 1208 #else 1209 default_rule.fw_flg |= IPV6_FW_F_DENY; 1210 #endif 1211 default_rule.fw_flg |= IPV6_FW_F_IN | IPV6_FW_F_OUT; 1212 if (check_ip6fw_struct(&default_rule) == NULL || 1213 add_entry6(&ip6_fw_chain, &default_rule)) 1214 panic(__func__); 1215 1216 kprintf("IPv6 packet filtering initialized, "); 1217 #ifdef IPV6FIREWALL_DEFAULT_TO_ACCEPT 1218 kprintf("default to accept, "); 1219 #endif 1220 #ifndef IPV6FIREWALL_VERBOSE 1221 kprintf("logging disabled\n"); 1222 #else 1223 if (fw6_verbose_limit == 0) 1224 kprintf("unlimited logging\n"); 1225 else 1226 kprintf("logging limited to %d packets/entry\n", 1227 fw6_verbose_limit); 1228 #endif 1229 } 1230 1231 static ip6_fw_chk_t *old_chk_ptr; 1232 static ip6_fw_ctl_t *old_ctl_ptr; 1233 1234 static int 1235 ip6fw_modevent(module_t mod, int type, void *unused) 1236 { 1237 switch (type) { 1238 case MOD_LOAD: 1239 crit_enter(); 1240 1241 old_chk_ptr = ip6_fw_chk_ptr; 1242 old_ctl_ptr = ip6_fw_ctl_ptr; 1243 1244 ip6_fw_init(); 1245 crit_exit(); 1246 return 0; 1247 case MOD_UNLOAD: 1248 crit_enter(); 1249 ip6_fw_chk_ptr = old_chk_ptr; 1250 ip6_fw_ctl_ptr = old_ctl_ptr; 1251 while (LIST_FIRST(&ip6_fw_chain) != NULL) { 1252 struct ip6_fw_chain *fcp = LIST_FIRST(&ip6_fw_chain); 1253 LIST_REMOVE(LIST_FIRST(&ip6_fw_chain), chain); 1254 kfree(fcp->rule, M_IP6FW); 1255 kfree(fcp, M_IP6FW); 1256 } 1257 1258 crit_exit(); 1259 kprintf("IPv6 firewall unloaded\n"); 1260 return 0; 1261 default: 1262 break; 1263 } 1264 return 0; 1265 } 1266 1267 static moduledata_t ip6fwmod = { 1268 "ip6fw", 1269 ip6fw_modevent, 1270 0 1271 }; 1272 DECLARE_MODULE(ip6fw, ip6fwmod, SI_SUB_PSEUDO, SI_ORDER_ANY); 1273