1139823Simp/*- 2200838Sluigi * Copyright (c) 2002-2009 Luigi Rizzo, Universita` di Pisa 398943Sluigi * 498943Sluigi * Redistribution and use in source and binary forms, with or without 598943Sluigi * modification, are permitted provided that the following conditions 698943Sluigi * are met: 798943Sluigi * 1. Redistributions of source code must retain the above copyright 898943Sluigi * notice, this list of conditions and the following disclaimer. 9116763Sluigi * 2. Redistributions in binary form must reproduce the above copyright 1098943Sluigi * notice, this list of conditions and the following disclaimer in the 1198943Sluigi * documentation and/or other materials provided with the distribution. 12105775Smaxim * 1398943Sluigi * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 1498943Sluigi * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 1598943Sluigi * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 1698943Sluigi * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 1798943Sluigi * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 1898943Sluigi * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 1998943Sluigi * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 2098943Sluigi * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 2198943Sluigi * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 2298943Sluigi * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 2398943Sluigi * SUCH DAMAGE. 2498943Sluigi */ 2598943Sluigi 26172467Ssilby#include <sys/cdefs.h> 27172467Ssilby__FBSDID("$FreeBSD$"); 28172467Ssilby 2998943Sluigi/* 30200601Sluigi * The FreeBSD IP packet firewall, main file 3198943Sluigi */ 3298943Sluigi 33225518Sjhb#include "opt_ipfw.h" 34166479Salc#include "opt_ipdivert.h" 3598943Sluigi#include "opt_inet.h" 3698943Sluigi#ifndef INET 3798943Sluigi#error IPFIREWALL requires INET. 3898943Sluigi#endif /* INET */ 39152928Sume#include "opt_inet6.h" 40152928Sume#include "opt_ipsec.h" 4198943Sluigi 4298943Sluigi#include <sys/param.h> 4398943Sluigi#include <sys/systm.h> 44138642Scsjp#include <sys/condvar.h> 45165648Spiso#include <sys/eventhandler.h> 4698943Sluigi#include <sys/malloc.h> 4798943Sluigi#include <sys/mbuf.h> 4898943Sluigi#include <sys/kernel.h> 49155201Scsjp#include <sys/lock.h> 50133600Scsjp#include <sys/jail.h> 51129876Sphk#include <sys/module.h> 52164033Srwatson#include <sys/priv.h> 5398943Sluigi#include <sys/proc.h> 54155201Scsjp#include <sys/rwlock.h> 5598943Sluigi#include <sys/socket.h> 5698943Sluigi#include <sys/socketvar.h> 5798943Sluigi#include <sys/sysctl.h> 5898943Sluigi#include <sys/syslog.h> 5998943Sluigi#include <sys/ucred.h> 60188676Sluigi#include <net/ethernet.h> /* for ETHERTYPE_IP */ 6198943Sluigi#include <net/if.h> 6298943Sluigi#include <net/route.h> 63171173Smlaier#include <net/pf_mtag.h> 64243586Sae#include <net/pfil.h> 65185571Sbz#include <net/vnet.h> 66175659Srwatson 6798943Sluigi#include <netinet/in.h> 6898943Sluigi#include <netinet/in_var.h> 6998943Sluigi#include <netinet/in_pcb.h> 7098943Sluigi#include <netinet/ip.h> 7198943Sluigi#include <netinet/ip_var.h> 7298943Sluigi#include <netinet/ip_icmp.h> 7398943Sluigi#include <netinet/ip_fw.h> 74163069Sbz#include <netinet/ip_carp.h> 75161767Sjhay#include <netinet/pim.h> 7698943Sluigi#include <netinet/tcp_var.h> 7798943Sluigi#include <netinet/udp.h> 7898943Sluigi#include <netinet/udp_var.h> 79164258Sbz#include <netinet/sctp.h> 80185571Sbz 81145246Sbrooks#include <netinet/ip6.h> 82145246Sbrooks#include <netinet/icmp6.h> 83148414Sume#ifdef INET6 84223073Sae#include <netinet6/in6_pcb.h> 85148414Sume#include <netinet6/scope6_var.h> 86200027Sume#include <netinet6/ip6_var.h> 87148414Sume#endif 88145246Sbrooks 89243401Sglebius#include <netpfil/ipfw/ip_fw_private.h> 90243401Sglebius 9199475Sluigi#include <machine/in_cksum.h> /* XXX for in_cksum */ 9299475Sluigi 93188580Sluigi#ifdef MAC 94163606Srwatson#include <security/mac/mac_framework.h> 95188580Sluigi#endif 96163606Srwatson 97101628Sluigi/* 98200601Sluigi * static variables followed by global ones. 99200601Sluigi * All ipfw global variables are here. 100101628Sluigi */ 10198943Sluigi 102200601Sluigi/* ipfw_vnet_ready controls when we are open for business */ 103215701Sdimstatic VNET_DEFINE(int, ipfw_vnet_ready) = 0; 104200601Sluigi#define V_ipfw_vnet_ready VNET(ipfw_vnet_ready) 105195699Srwatson 106215701Sdimstatic VNET_DEFINE(int, fw_deny_unknown_exthdrs); 107200601Sluigi#define V_fw_deny_unknown_exthdrs VNET(fw_deny_unknown_exthdrs) 108200601Sluigi 109225030Sbzstatic VNET_DEFINE(int, fw_permit_single_frag6) = 1; 110225030Sbz#define V_fw_permit_single_frag6 VNET(fw_permit_single_frag6) 111225030Sbz 112191932Sjhb#ifdef IPFIREWALL_DEFAULT_TO_ACCEPT 113191932Sjhbstatic int default_to_accept = 1; 114191932Sjhb#else 115191932Sjhbstatic int default_to_accept; 116191932Sjhb#endif 11798943Sluigi 118200601SluigiVNET_DEFINE(int, autoinc_step); 119220878SbzVNET_DEFINE(int, fw_one_pass) = 1; 120193859Soleg 121234597SmelifaroVNET_DEFINE(unsigned int, fw_tables_max); 122234597Smelifaro/* Use 128 tables by default */ 123234597Smelifarostatic unsigned int default_fw_tables = IPFW_TABLES_DEFAULT; 124234597Smelifaro 125130363Scsjp/* 126200601Sluigi * Each rule belongs to one of 32 different sets (0..31). 127200601Sluigi * The variable set_disable contains one bit per set. 128200601Sluigi * If the bit is set, all rules in the corresponding set 129200601Sluigi * are disabled. Set RESVD_SET(31) is reserved for the default rule 130200601Sluigi * and rules that are not deleted by the flush command, 131200601Sluigi * and CANNOT be disabled. 132200601Sluigi * Rules in set RESVD_SET can only be deleted individually. 13398943Sluigi */ 134200601SluigiVNET_DEFINE(u_int32_t, set_disable); 135200601Sluigi#define V_set_disable VNET(set_disable) 136200601Sluigi 137200601SluigiVNET_DEFINE(int, fw_verbose); 138200601Sluigi/* counter for ipfw_log(NULL...) */ 139200601SluigiVNET_DEFINE(u_int64_t, norule_counter); 140200601SluigiVNET_DEFINE(int, verbose_limit); 141200601Sluigi 142200601Sluigi/* layer3_chain contains the list of rules for layer 3 */ 143195699SrwatsonVNET_DEFINE(struct ip_fw_chain, layer3_chain); 14498943Sluigi 145255395StrocinyVNET_DEFINE(int, ipfw_nat_ready) = 0; 146255395Strociny 147176669Spisoipfw_nat_t *ipfw_nat_ptr = NULL; 148200580Sluigistruct cfg_nat *(*lookup_nat_ptr)(struct nat_list *, int); 149176669Spisoipfw_nat_cfg_t *ipfw_nat_cfg_ptr; 150176669Spisoipfw_nat_cfg_t *ipfw_nat_del_ptr; 151176669Spisoipfw_nat_cfg_t *ipfw_nat_get_cfg_ptr; 152176669Spisoipfw_nat_cfg_t *ipfw_nat_get_log_ptr; 15398943Sluigi 15498943Sluigi#ifdef SYSCTL_NODE 155204591Sluigiuint32_t dummy_def = IPFW_DEFAULT_RULE; 156234597Smelifarostatic int sysctl_ipfw_table_num(SYSCTL_HANDLER_ARGS); 157204591Sluigi 158204591SluigiSYSBEGIN(f3) 159204591Sluigi 16098943SluigiSYSCTL_NODE(_net_inet_ip, OID_AUTO, fw, CTLFLAG_RW, 0, "Firewall"); 161200601SluigiSYSCTL_VNET_INT(_net_inet_ip_fw, OID_AUTO, one_pass, 162200601Sluigi CTLFLAG_RW | CTLFLAG_SECURE3, &VNET_NAME(fw_one_pass), 0, 163200601Sluigi "Only do a single pass through ipfw when using dummynet(4)"); 164195699SrwatsonSYSCTL_VNET_INT(_net_inet_ip_fw, OID_AUTO, autoinc_step, 165195862Sjulian CTLFLAG_RW, &VNET_NAME(autoinc_step), 0, 166195862Sjulian "Rule number auto-increment step"); 167195699SrwatsonSYSCTL_VNET_INT(_net_inet_ip_fw, OID_AUTO, verbose, 168195862Sjulian CTLFLAG_RW | CTLFLAG_SECURE3, &VNET_NAME(fw_verbose), 0, 169195862Sjulian "Log matches to ipfw rules"); 170195699SrwatsonSYSCTL_VNET_INT(_net_inet_ip_fw, OID_AUTO, verbose_limit, 171195699Srwatson CTLFLAG_RW, &VNET_NAME(verbose_limit), 0, 172186048Sbz "Set upper limit of matches of ipfw rules logged"); 173182818SrikSYSCTL_UINT(_net_inet_ip_fw, OID_AUTO, default_rule, CTLFLAG_RD, 174204591Sluigi &dummy_def, 0, 175195862Sjulian "The default/max possible rule number."); 176234597SmelifaroSYSCTL_VNET_PROC(_net_inet_ip_fw, OID_AUTO, tables_max, 177234597Smelifaro CTLTYPE_UINT|CTLFLAG_RW, 0, 0, sysctl_ipfw_table_num, "IU", 178234597Smelifaro "Maximum number of tables"); 179191932SjhbSYSCTL_INT(_net_inet_ip_fw, OID_AUTO, default_to_accept, CTLFLAG_RDTUN, 180195862Sjulian &default_to_accept, 0, 181195862Sjulian "Make the default rule accept all packets."); 182191932SjhbTUNABLE_INT("net.inet.ip.fw.default_to_accept", &default_to_accept); 183234597SmelifaroTUNABLE_INT("net.inet.ip.fw.tables_max", &default_fw_tables); 184200838SluigiSYSCTL_VNET_INT(_net_inet_ip_fw, OID_AUTO, static_count, 185200838Sluigi CTLFLAG_RD, &VNET_NAME(layer3_chain.n_rules), 0, 186200838Sluigi "Number of static rules"); 187200040Sluigi 188195862Sjulian#ifdef INET6 189195862SjulianSYSCTL_DECL(_net_inet6_ip6); 190195862SjulianSYSCTL_NODE(_net_inet6_ip6, OID_AUTO, fw, CTLFLAG_RW, 0, "Firewall"); 191195862SjulianSYSCTL_VNET_INT(_net_inet6_ip6_fw, OID_AUTO, deny_unknown_exthdrs, 192195862Sjulian CTLFLAG_RW | CTLFLAG_SECURE, &VNET_NAME(fw_deny_unknown_exthdrs), 0, 193195862Sjulian "Deny packets with unknown IPv6 Extension Headers"); 194225030SbzSYSCTL_VNET_INT(_net_inet6_ip6_fw, OID_AUTO, permit_single_frag6, 195225030Sbz CTLFLAG_RW | CTLFLAG_SECURE, &VNET_NAME(fw_permit_single_frag6), 0, 196225030Sbz "Permit single packet IPv6 fragments"); 197200040Sluigi#endif /* INET6 */ 19898943Sluigi 199204591SluigiSYSEND 200204591Sluigi 201187821Sluigi#endif /* SYSCTL_NODE */ 20298943Sluigi 203200580Sluigi 204149020Sbz/* 205200601Sluigi * Some macros used in the various matching options. 206145093Sbrooks * L3HDR maps an ipv4 pointer into a layer3 header pointer of type T 207145093Sbrooks * Other macros just cast void * into the appropriate type 20898943Sluigi */ 209145093Sbrooks#define L3HDR(T, ip) ((T *)((u_int32_t *)(ip) + (ip)->ip_hl)) 210145093Sbrooks#define TCP(p) ((struct tcphdr *)(p)) 211164258Sbz#define SCTP(p) ((struct sctphdr *)(p)) 212145093Sbrooks#define UDP(p) ((struct udphdr *)(p)) 213145565Sbrooks#define ICMP(p) ((struct icmphdr *)(p)) 214145246Sbrooks#define ICMP6(p) ((struct icmp6_hdr *)(p)) 21598943Sluigi 21699622Sluigistatic __inline int 217145565Sbrooksicmptype_match(struct icmphdr *icmp, ipfw_insn_u32 *cmd) 21898943Sluigi{ 219145093Sbrooks int type = icmp->icmp_type; 22098943Sluigi 22198943Sluigi return (type <= ICMP_MAXTYPE && (cmd->d[0] & (1<<type)) ); 22298943Sluigi} 22398943Sluigi 22498943Sluigi#define TT ( (1 << ICMP_ECHO) | (1 << ICMP_ROUTERSOLICIT) | \ 22598943Sluigi (1 << ICMP_TSTAMP) | (1 << ICMP_IREQ) | (1 << ICMP_MASKREQ) ) 22698943Sluigi 22798943Sluigistatic int 228145565Sbrooksis_icmp_query(struct icmphdr *icmp) 22998943Sluigi{ 230145093Sbrooks int type = icmp->icmp_type; 231145093Sbrooks 23298943Sluigi return (type <= ICMP_MAXTYPE && (TT & (1<<type)) ); 23398943Sluigi} 23498943Sluigi#undef TT 23598943Sluigi 23698943Sluigi/* 23798943Sluigi * The following checks use two arrays of 8 or 16 bits to store the 23898943Sluigi * bits that we want set or clear, respectively. They are in the 23998943Sluigi * low and high half of cmd->arg1 or cmd->d[0]. 24098943Sluigi * 24198943Sluigi * We scan options and store the bits we find set. We succeed if 24298943Sluigi * 24398943Sluigi * (want_set & ~bits) == 0 && (want_clear & ~bits) == want_clear 24498943Sluigi * 24598943Sluigi * The code is sometimes optimized not to store additional variables. 24698943Sluigi */ 24798943Sluigi 24898943Sluigistatic int 24998943Sluigiflags_match(ipfw_insn *cmd, u_int8_t bits) 25098943Sluigi{ 25198943Sluigi u_char want_clear; 25298943Sluigi bits = ~bits; 25398943Sluigi 25498943Sluigi if ( ((cmd->arg1 & 0xff) & bits) != 0) 25598943Sluigi return 0; /* some bits we want set were clear */ 25698943Sluigi want_clear = (cmd->arg1 >> 8) & 0xff; 25798943Sluigi if ( (want_clear & bits) != want_clear) 25898943Sluigi return 0; /* some bits we want clear were set */ 25998943Sluigi return 1; 26098943Sluigi} 26198943Sluigi 26298943Sluigistatic int 26398943Sluigiipopts_match(struct ip *ip, ipfw_insn *cmd) 26498943Sluigi{ 26598943Sluigi int optlen, bits = 0; 26698943Sluigi u_char *cp = (u_char *)(ip + 1); 26798943Sluigi int x = (ip->ip_hl << 2) - sizeof (struct ip); 26898943Sluigi 26998943Sluigi for (; x > 0; x -= optlen, cp += optlen) { 27098943Sluigi int opt = cp[IPOPT_OPTVAL]; 27198943Sluigi 27298943Sluigi if (opt == IPOPT_EOL) 27398943Sluigi break; 27498943Sluigi if (opt == IPOPT_NOP) 27598943Sluigi optlen = 1; 27698943Sluigi else { 27798943Sluigi optlen = cp[IPOPT_OLEN]; 27898943Sluigi if (optlen <= 0 || optlen > x) 27998943Sluigi return 0; /* invalid or truncated */ 28098943Sluigi } 28198943Sluigi switch (opt) { 28298943Sluigi 28398943Sluigi default: 28498943Sluigi break; 28598943Sluigi 28698943Sluigi case IPOPT_LSRR: 28798943Sluigi bits |= IP_FW_IPOPT_LSRR; 28898943Sluigi break; 28998943Sluigi 29098943Sluigi case IPOPT_SSRR: 29198943Sluigi bits |= IP_FW_IPOPT_SSRR; 29298943Sluigi break; 29398943Sluigi 29498943Sluigi case IPOPT_RR: 29598943Sluigi bits |= IP_FW_IPOPT_RR; 29698943Sluigi break; 29798943Sluigi 29898943Sluigi case IPOPT_TS: 29998943Sluigi bits |= IP_FW_IPOPT_TS; 30098943Sluigi break; 30198943Sluigi } 30298943Sluigi } 30398943Sluigi return (flags_match(cmd, bits)); 30498943Sluigi} 30598943Sluigi 30698943Sluigistatic int 307145093Sbrookstcpopts_match(struct tcphdr *tcp, ipfw_insn *cmd) 30898943Sluigi{ 30998943Sluigi int optlen, bits = 0; 31098943Sluigi u_char *cp = (u_char *)(tcp + 1); 31198943Sluigi int x = (tcp->th_off << 2) - sizeof(struct tcphdr); 31298943Sluigi 31398943Sluigi for (; x > 0; x -= optlen, cp += optlen) { 31498943Sluigi int opt = cp[0]; 31598943Sluigi if (opt == TCPOPT_EOL) 31698943Sluigi break; 31798943Sluigi if (opt == TCPOPT_NOP) 31898943Sluigi optlen = 1; 31998943Sluigi else { 32098943Sluigi optlen = cp[1]; 32198943Sluigi if (optlen <= 0) 32298943Sluigi break; 32398943Sluigi } 32498943Sluigi 32598943Sluigi switch (opt) { 32698943Sluigi 32798943Sluigi default: 32898943Sluigi break; 32998943Sluigi 33098943Sluigi case TCPOPT_MAXSEG: 33198943Sluigi bits |= IP_FW_TCPOPT_MSS; 33298943Sluigi break; 33398943Sluigi 33498943Sluigi case TCPOPT_WINDOW: 33598943Sluigi bits |= IP_FW_TCPOPT_WINDOW; 33698943Sluigi break; 33798943Sluigi 33898943Sluigi case TCPOPT_SACK_PERMITTED: 33998943Sluigi case TCPOPT_SACK: 34098943Sluigi bits |= IP_FW_TCPOPT_SACK; 34198943Sluigi break; 34298943Sluigi 34398943Sluigi case TCPOPT_TIMESTAMP: 34498943Sluigi bits |= IP_FW_TCPOPT_TS; 34598943Sluigi break; 34698943Sluigi 34798943Sluigi } 34898943Sluigi } 34998943Sluigi return (flags_match(cmd, bits)); 35098943Sluigi} 35198943Sluigi 35298943Sluigistatic int 353234597Smelifaroiface_match(struct ifnet *ifp, ipfw_insn_if *cmd, struct ip_fw_chain *chain, uint32_t *tablearg) 35498943Sluigi{ 35598943Sluigi if (ifp == NULL) /* no iface with this packet, match fails */ 35698943Sluigi return 0; 35798943Sluigi /* Check by name or by IP address */ 35899475Sluigi if (cmd->name[0] != '\0') { /* match by name */ 359234597Smelifaro if (cmd->name[0] == '\1') /* use tablearg to match */ 360234597Smelifaro return ipfw_lookup_table_extended(chain, cmd->p.glob, 361234597Smelifaro ifp->if_xname, tablearg, IPFW_TABLE_INTERFACE); 36298943Sluigi /* Check name */ 363121816Sbrooks if (cmd->p.glob) { 364121816Sbrooks if (fnmatch(cmd->name, ifp->if_xname, 0) == 0) 365121816Sbrooks return(1); 366121816Sbrooks } else { 367121816Sbrooks if (strncmp(ifp->if_xname, cmd->name, IFNAMSIZ) == 0) 368121816Sbrooks return(1); 369121816Sbrooks } 37098943Sluigi } else { 371210120Sluigi#ifdef __FreeBSD__ /* and OSX too ? */ 37298943Sluigi struct ifaddr *ia; 37398943Sluigi 374195023Srwatson if_addr_rlock(ifp); 37598943Sluigi TAILQ_FOREACH(ia, &ifp->if_addrhead, ifa_link) { 37698943Sluigi if (ia->ifa_addr->sa_family != AF_INET) 37798943Sluigi continue; 37898943Sluigi if (cmd->p.ip.s_addr == ((struct sockaddr_in *) 379191288Srwatson (ia->ifa_addr))->sin_addr.s_addr) { 380195023Srwatson if_addr_runlock(ifp); 38198943Sluigi return(1); /* match */ 382191288Srwatson } 38398943Sluigi } 384195023Srwatson if_addr_runlock(ifp); 385204591Sluigi#endif /* __FreeBSD__ */ 38698943Sluigi } 38798943Sluigi return(0); /* no match, fail ... */ 38898943Sluigi} 38998943Sluigi 390112250Scjc/* 391128575Sandre * The verify_path function checks if a route to the src exists and 392128575Sandre * if it is reachable via ifp (when provided). 393128575Sandre * 394112250Scjc * The 'verrevpath' option checks that the interface that an IP packet 395116763Sluigi * arrives on is the same interface that traffic destined for the 396200601Sluigi * packet's source address would be routed out of. 397200601Sluigi * The 'versrcreach' option just checks that the source address is 398200601Sluigi * reachable via any route (except default) in the routing table. 399200601Sluigi * These two are a measure to block forged packets. This is also 400200601Sluigi * commonly known as "anti-spoofing" or Unicast Reverse Path 401200601Sluigi * Forwarding (Unicast RFP) in Cisco-ese. The name of the knobs 402128575Sandre * is purposely reminiscent of the Cisco IOS command, 403112250Scjc * 404112250Scjc * ip verify unicast reverse-path 405128575Sandre * ip verify unicast source reachable-via any 406112250Scjc * 407200601Sluigi * which implements the same functionality. But note that the syntax 408200601Sluigi * is misleading, and the check may be performed on all IP packets 409200601Sluigi * whether unicast, multicast, or broadcast. 410112250Scjc */ 411112250Scjcstatic int 412178888Sjulianverify_path(struct in_addr src, struct ifnet *ifp, u_int fib) 413112250Scjc{ 414204591Sluigi#ifndef __FreeBSD__ 415204591Sluigi return 0; 416204591Sluigi#else 417123000Sandre struct route ro; 418112250Scjc struct sockaddr_in *dst; 419112250Scjc 420123000Sandre bzero(&ro, sizeof(ro)); 421123000Sandre 422112250Scjc dst = (struct sockaddr_in *)&(ro.ro_dst); 423123000Sandre dst->sin_family = AF_INET; 424123000Sandre dst->sin_len = sizeof(*dst); 425123000Sandre dst->sin_addr = src; 426186119Sqingli in_rtalloc_ign(&ro, 0, fib); 427112250Scjc 428122922Sandre if (ro.ro_rt == NULL) 429112250Scjc return 0; 430128575Sandre 431154769Soleg /* 432154769Soleg * If ifp is provided, check for equality with rtentry. 433154769Soleg * We should use rt->rt_ifa->ifa_ifp, instead of rt->rt_ifp, 434154769Soleg * in order to pass packets injected back by if_simloop(): 435154769Soleg * if useloopback == 1 routing entry (via lo0) for our own address 436154769Soleg * may exist, so we need to handle routing assymetry. 437154769Soleg */ 438154769Soleg if (ifp != NULL && ro.ro_rt->rt_ifa->ifa_ifp != ifp) { 439122922Sandre RTFREE(ro.ro_rt); 440122922Sandre return 0; 441122922Sandre } 442128575Sandre 443128575Sandre /* if no ifp provided, check if rtentry is not default route */ 444128575Sandre if (ifp == NULL && 445128575Sandre satosin(rt_key(ro.ro_rt))->sin_addr.s_addr == INADDR_ANY) { 446128575Sandre RTFREE(ro.ro_rt); 447128575Sandre return 0; 448128575Sandre } 449128575Sandre 450132510Sandre /* or if this is a blackhole/reject route */ 451132510Sandre if (ifp == NULL && ro.ro_rt->rt_flags & (RTF_REJECT|RTF_BLACKHOLE)) { 452132510Sandre RTFREE(ro.ro_rt); 453132510Sandre return 0; 454132510Sandre } 455132510Sandre 456128575Sandre /* found valid route */ 457122922Sandre RTFREE(ro.ro_rt); 458116981Sluigi return 1; 459204591Sluigi#endif /* __FreeBSD__ */ 460112250Scjc} 461112250Scjc 462145266Sphk#ifdef INET6 463145246Sbrooks/* 464145246Sbrooks * ipv6 specific rules here... 465145246Sbrooks */ 466145246Sbrooksstatic __inline int 467145246Sbrooksicmp6type_match (int type, ipfw_insn_u32 *cmd) 468145246Sbrooks{ 469147415Smlaier return (type <= ICMP6_MAXTYPE && (cmd->d[type/32] & (1<<(type%32)) ) ); 470145246Sbrooks} 471112250Scjc 472145246Sbrooksstatic int 473145246Sbrooksflow6id_match( int curr_flow, ipfw_insn_u32 *cmd ) 474145246Sbrooks{ 475147415Smlaier int i; 476147415Smlaier for (i=0; i <= cmd->o.arg1; ++i ) 477147415Smlaier if (curr_flow == cmd->d[i] ) 478147415Smlaier return 1; 479147415Smlaier return 0; 480145246Sbrooks} 481145246Sbrooks 482145246Sbrooks/* support for IP6_*_ME opcodes */ 483145246Sbrooksstatic int 484145246Sbrookssearch_ip6_addr_net (struct in6_addr * ip6_addr) 485145246Sbrooks{ 486147415Smlaier struct ifnet *mdc; 487147415Smlaier struct ifaddr *mdc2; 488147415Smlaier struct in6_ifaddr *fdm; 489147415Smlaier struct in6_addr copia; 490145246Sbrooks 491191288Srwatson TAILQ_FOREACH(mdc, &V_ifnet, if_link) { 492195023Srwatson if_addr_rlock(mdc); 493191338Srwatson TAILQ_FOREACH(mdc2, &mdc->if_addrhead, ifa_link) { 494147415Smlaier if (mdc2->ifa_addr->sa_family == AF_INET6) { 495147415Smlaier fdm = (struct in6_ifaddr *)mdc2; 496147415Smlaier copia = fdm->ia_addr.sin6_addr; 497147415Smlaier /* need for leaving scope_id in the sock_addr */ 498147415Smlaier in6_clearscope(&copia); 499191288Srwatson if (IN6_ARE_ADDR_EQUAL(ip6_addr, &copia)) { 500195023Srwatson if_addr_runlock(mdc); 501147415Smlaier return 1; 502191288Srwatson } 503147415Smlaier } 504147415Smlaier } 505195023Srwatson if_addr_runlock(mdc); 506191288Srwatson } 507147415Smlaier return 0; 508145246Sbrooks} 509145246Sbrooks 510145246Sbrooksstatic int 511232292Sbzverify_path6(struct in6_addr *src, struct ifnet *ifp, u_int fib) 512145246Sbrooks{ 513147418Smlaier struct route_in6 ro; 514147415Smlaier struct sockaddr_in6 *dst; 515145246Sbrooks 516147418Smlaier bzero(&ro, sizeof(ro)); 517147418Smlaier 518147415Smlaier dst = (struct sockaddr_in6 * )&(ro.ro_dst); 519147418Smlaier dst->sin6_family = AF_INET6; 520147418Smlaier dst->sin6_len = sizeof(*dst); 521147418Smlaier dst->sin6_addr = *src; 522145246Sbrooks 523232292Sbz in6_rtalloc_ign(&ro, 0, fib); 524147418Smlaier if (ro.ro_rt == NULL) 525147418Smlaier return 0; 526147418Smlaier 527152288Ssuz /* 528152288Ssuz * if ifp is provided, check for equality with rtentry 529152288Ssuz * We should use rt->rt_ifa->ifa_ifp, instead of rt->rt_ifp, 530152288Ssuz * to support the case of sending packets to an address of our own. 531152288Ssuz * (where the former interface is the first argument of if_simloop() 532152288Ssuz * (=ifp), the latter is lo0) 533152288Ssuz */ 534152288Ssuz if (ifp != NULL && ro.ro_rt->rt_ifa->ifa_ifp != ifp) { 535147418Smlaier RTFREE(ro.ro_rt); 536147418Smlaier return 0; 537147415Smlaier } 538147418Smlaier 539147418Smlaier /* if no ifp provided, check if rtentry is not default route */ 540147418Smlaier if (ifp == NULL && 541147418Smlaier IN6_IS_ADDR_UNSPECIFIED(&satosin6(rt_key(ro.ro_rt))->sin6_addr)) { 542147418Smlaier RTFREE(ro.ro_rt); 543147415Smlaier return 0; 544147418Smlaier } 545147418Smlaier 546147418Smlaier /* or if this is a blackhole/reject route */ 547147418Smlaier if (ifp == NULL && ro.ro_rt->rt_flags & (RTF_REJECT|RTF_BLACKHOLE)) { 548147418Smlaier RTFREE(ro.ro_rt); 549147418Smlaier return 0; 550147418Smlaier } 551147418Smlaier 552147418Smlaier /* found valid route */ 553147418Smlaier RTFREE(ro.ro_rt); 554147415Smlaier return 1; 555147418Smlaier 556145246Sbrooks} 557200601Sluigi 558149020Sbzstatic int 559149020Sbzis_icmp6_query(int icmp6_type) 560149020Sbz{ 561149020Sbz if ((icmp6_type <= ICMP6_MAXTYPE) && 562149020Sbz (icmp6_type == ICMP6_ECHO_REQUEST || 563149020Sbz icmp6_type == ICMP6_MEMBERSHIP_QUERY || 564149020Sbz icmp6_type == ICMP6_WRUREQUEST || 565149020Sbz icmp6_type == ICMP6_FQDN_QUERY || 566149020Sbz icmp6_type == ICMP6_NI_QUERY)) 567149020Sbz return (1); 568149020Sbz 569149020Sbz return (0); 570149020Sbz} 571149020Sbz 572149020Sbzstatic void 573165738Sjuliansend_reject6(struct ip_fw_args *args, int code, u_int hlen, struct ip6_hdr *ip6) 574149020Sbz{ 575165738Sjulian struct mbuf *m; 576165738Sjulian 577165738Sjulian m = args->m; 578160025Sbz if (code == ICMP6_UNREACH_RST && args->f_id.proto == IPPROTO_TCP) { 579149020Sbz struct tcphdr *tcp; 580165738Sjulian tcp = (struct tcphdr *)((char *)ip6 + hlen); 581149020Sbz 582200027Sume if ((tcp->th_flags & TH_RST) == 0) { 583200027Sume struct mbuf *m0; 584200601Sluigi m0 = ipfw_send_pkt(args->m, &(args->f_id), 585200027Sume ntohl(tcp->th_seq), ntohl(tcp->th_ack), 586200027Sume tcp->th_flags | TH_RST); 587200027Sume if (m0 != NULL) 588200027Sume ip6_output(m0, NULL, NULL, 0, NULL, NULL, 589200027Sume NULL); 590149020Sbz } 591201527Sluigi FREE_PKT(m); 592149020Sbz } else if (code != ICMP6_UNREACH_RST) { /* Send an ICMPv6 unreach. */ 593165738Sjulian#if 0 594165738Sjulian /* 595165738Sjulian * Unlike above, the mbufs need to line up with the ip6 hdr, 596165738Sjulian * as the contents are read. We need to m_adj() the 597165738Sjulian * needed amount. 598165738Sjulian * The mbuf will however be thrown away so we can adjust it. 599165738Sjulian * Remember we did an m_pullup on it already so we 600165738Sjulian * can make some assumptions about contiguousness. 601165738Sjulian */ 602165738Sjulian if (args->L3offset) 603165738Sjulian m_adj(m, args->L3offset); 604165738Sjulian#endif 605165738Sjulian icmp6_error(m, ICMP6_DST_UNREACH, code, 0); 606149020Sbz } else 607201527Sluigi FREE_PKT(m); 608149020Sbz 609149020Sbz args->m = NULL; 610149020Sbz} 611149020Sbz 612145266Sphk#endif /* INET6 */ 613145266Sphk 61498943Sluigi 61598943Sluigi/* 61698943Sluigi * sends a reject message, consuming the mbuf passed as an argument. 61798943Sluigi */ 61898943Sluigistatic void 619201122Sluigisend_reject(struct ip_fw_args *args, int code, int iplen, struct ip *ip) 62098943Sluigi{ 621101843Sphk 622165738Sjulian#if 0 623165738Sjulian /* XXX When ip is not guaranteed to be at mtod() we will 624165738Sjulian * need to account for this */ 625165738Sjulian * The mbuf will however be thrown away so we can adjust it. 626165738Sjulian * Remember we did an m_pullup on it already so we 627165738Sjulian * can make some assumptions about contiguousness. 628165738Sjulian */ 629165738Sjulian if (args->L3offset) 630165738Sjulian m_adj(m, args->L3offset); 631165738Sjulian#endif 632108327Siedowse if (code != ICMP_REJECT_RST) { /* Send an ICMP unreach */ 633108327Siedowse /* We need the IP header in host order for icmp_error(). */ 634201527Sluigi SET_HOST_IPLEN(ip); 63599475Sluigi icmp_error(args->m, ICMP_UNREACH, code, 0L, 0); 636160025Sbz } else if (args->f_id.proto == IPPROTO_TCP) { 63799475Sluigi struct tcphdr *const tcp = 63899475Sluigi L3HDR(struct tcphdr, mtod(args->m, struct ip *)); 639147247Sgreen if ( (tcp->th_flags & TH_RST) == 0) { 640147247Sgreen struct mbuf *m; 641200601Sluigi m = ipfw_send_pkt(args->m, &(args->f_id), 642162238Scsjp ntohl(tcp->th_seq), ntohl(tcp->th_ack), 643100004Sluigi tcp->th_flags | TH_RST); 644147247Sgreen if (m != NULL) 645147247Sgreen ip_output(m, NULL, NULL, 0, NULL, NULL); 646147247Sgreen } 647201527Sluigi FREE_PKT(args->m); 64899475Sluigi } else 649201527Sluigi FREE_PKT(args->m); 65099475Sluigi args->m = NULL; 65198943Sluigi} 65298943Sluigi 653200601Sluigi/* 654200601Sluigi * Support for uid/gid/jail lookup. These tests are expensive 655200601Sluigi * (because we may need to look into the list of active sockets) 656200601Sluigi * so we cache the results. ugid_lookupp is 0 if we have not 657200601Sluigi * yet done a lookup, 1 if we succeeded, and -1 if we tried 658200601Sluigi * and failed. The function always returns the match value. 659200601Sluigi * We could actually spare the variable and use *uc, setting 660200601Sluigi * it to '(void *)check_uidgid if we have no info, NULL if 661200601Sluigi * we tried and failed, or any other value if successful. 662200601Sluigi */ 663122265Ssamstatic int 664223073Saecheck_uidgid(ipfw_insn_u32 *insn, struct ip_fw_args *args, int *ugid_lookupp, 665223073Sae struct ucred **uc) 666122265Ssam{ 667204591Sluigi#ifndef __FreeBSD__ 668223073Sae /* XXX */ 669204591Sluigi return cred_check(insn, proto, oif, 670204591Sluigi dst_ip, dst_port, src_ip, src_port, 671204591Sluigi (struct bsd_ucred *)uc, ugid_lookupp, ((struct mbuf *)inp)->m_skb); 672204591Sluigi#else /* FreeBSD */ 673223073Sae struct in_addr src_ip, dst_ip; 674122265Ssam struct inpcbinfo *pi; 675223073Sae struct ipfw_flow_id *id; 676223073Sae struct inpcb *pcb, *inp; 677223073Sae struct ifnet *oif; 678222488Srwatson int lookupflags; 679122265Ssam int match; 680122265Ssam 681223073Sae id = &args->f_id; 682223073Sae inp = args->inp; 683223073Sae oif = args->oif; 684223073Sae 685130363Scsjp /* 686135920Smlaier * Check to see if the UDP or TCP stack supplied us with 687135920Smlaier * the PCB. If so, rather then holding a lock and looking 688135920Smlaier * up the PCB, we can use the one that was supplied. 689135920Smlaier */ 690183398Srwatson if (inp && *ugid_lookupp == 0) { 691178325Srwatson INP_LOCK_ASSERT(inp); 692135920Smlaier if (inp->inp_socket != NULL) { 693194498Sbrooks *uc = crhold(inp->inp_cred); 694183398Srwatson *ugid_lookupp = 1; 695183418Srwatson } else 696183418Srwatson *ugid_lookupp = -1; 697135920Smlaier } 698135920Smlaier /* 699130363Scsjp * If we have already been here and the packet has no 700130363Scsjp * PCB entry associated with it, then we can safely 701130363Scsjp * assume that this is a no match. 702130363Scsjp */ 703183398Srwatson if (*ugid_lookupp == -1) 704130363Scsjp return (0); 705223073Sae if (id->proto == IPPROTO_TCP) { 706222488Srwatson lookupflags = 0; 707181803Sbz pi = &V_tcbinfo; 708223073Sae } else if (id->proto == IPPROTO_UDP) { 709222488Srwatson lookupflags = INPLOOKUP_WILDCARD; 710181803Sbz pi = &V_udbinfo; 711122265Ssam } else 712122265Ssam return 0; 713222488Srwatson lookupflags |= INPLOOKUP_RLOCKPCB; 714122265Ssam match = 0; 715183398Srwatson if (*ugid_lookupp == 0) { 716223073Sae if (id->addr_type == 6) { 717223073Sae#ifdef INET6 718223073Sae if (oif == NULL) 719223073Sae pcb = in6_pcblookup_mbuf(pi, 720223073Sae &id->src_ip6, htons(id->src_port), 721223073Sae &id->dst_ip6, htons(id->dst_port), 722223073Sae lookupflags, oif, args->m); 723223073Sae else 724223073Sae pcb = in6_pcblookup_mbuf(pi, 725223073Sae &id->dst_ip6, htons(id->dst_port), 726223073Sae &id->src_ip6, htons(id->src_port), 727223073Sae lookupflags, oif, args->m); 728223073Sae#else 729223073Sae *ugid_lookupp = -1; 730223073Sae return (0); 731223073Sae#endif 732223073Sae } else { 733223073Sae src_ip.s_addr = htonl(id->src_ip); 734223073Sae dst_ip.s_addr = htonl(id->dst_ip); 735223073Sae if (oif == NULL) 736223073Sae pcb = in_pcblookup_mbuf(pi, 737223073Sae src_ip, htons(id->src_port), 738223073Sae dst_ip, htons(id->dst_port), 739223073Sae lookupflags, oif, args->m); 740223073Sae else 741223073Sae pcb = in_pcblookup_mbuf(pi, 742223073Sae dst_ip, htons(id->dst_port), 743223073Sae src_ip, htons(id->src_port), 744223073Sae lookupflags, oif, args->m); 745223073Sae } 746130363Scsjp if (pcb != NULL) { 747222488Srwatson INP_RLOCK_ASSERT(pcb); 748196201Sjulian *uc = crhold(pcb->inp_cred); 749183606Sbz *ugid_lookupp = 1; 750222488Srwatson INP_RUNLOCK(pcb); 751122265Ssam } 752183398Srwatson if (*ugid_lookupp == 0) { 753130363Scsjp /* 754200601Sluigi * We tried and failed, set the variable to -1 755200601Sluigi * so we will not try again on this packet. 756130363Scsjp */ 757183398Srwatson *ugid_lookupp = -1; 758130363Scsjp return (0); 759130363Scsjp } 760223073Sae } 761130363Scsjp if (insn->o.opcode == O_UID) 762194498Sbrooks match = ((*uc)->cr_uid == (uid_t)insn->d[0]); 763194498Sbrooks else if (insn->o.opcode == O_GID) 764194498Sbrooks match = groupmember((gid_t)insn->d[0], *uc); 765194498Sbrooks else if (insn->o.opcode == O_JAIL) 766194498Sbrooks match = ((*uc)->cr_prison->pr_id == (int)insn->d[0]); 767223073Sae return (match); 768204591Sluigi#endif /* __FreeBSD__ */ 769122265Ssam} 770122265Ssam 77198943Sluigi/* 772201527Sluigi * Helper function to set args with info on the rule after the matching 773201527Sluigi * one. slot is precise, whereas we guess rule_id as they are 774201527Sluigi * assigned sequentially. 775200838Sluigi */ 776200838Sluigistatic inline void 777200855Sluigiset_match(struct ip_fw_args *args, int slot, 778200855Sluigi struct ip_fw_chain *chain) 779200838Sluigi{ 780201527Sluigi args->rule.chain_id = chain->id; 781201527Sluigi args->rule.slot = slot + 1; /* we use 0 as a marker */ 782201527Sluigi args->rule.rule_id = 1 + chain->map[slot]->id; 783201527Sluigi args->rule.rulenum = chain->map[slot]->rulenum; 784200838Sluigi} 785200838Sluigi 786200838Sluigi/* 787250760Smelifaro * Helper function to enable cached rule lookups using 788250760Smelifaro * x_next and next_rule fields in ipfw rule. 789250760Smelifaro */ 790250760Smelifarostatic int 791250760Smelifarojump_fast(struct ip_fw_chain *chain, struct ip_fw *f, int num, 792250760Smelifaro int tablearg, int jump_backwards) 793250760Smelifaro{ 794250760Smelifaro int f_pos; 795250760Smelifaro 796250760Smelifaro /* If possible use cached f_pos (in f->next_rule), 797250760Smelifaro * whose version is written in f->next_rule 798250760Smelifaro * (horrible hacks to avoid changing the ABI). 799250760Smelifaro */ 800250760Smelifaro if (num != IP_FW_TABLEARG && (uintptr_t)f->x_next == chain->id) 801250760Smelifaro f_pos = (uintptr_t)f->next_rule; 802250760Smelifaro else { 803250760Smelifaro int i = IP_FW_ARG_TABLEARG(num); 804250760Smelifaro /* make sure we do not jump backward */ 805250760Smelifaro if (jump_backwards == 0 && i <= f->rulenum) 806250760Smelifaro i = f->rulenum + 1; 807250760Smelifaro f_pos = ipfw_find_rule(chain, i, 0); 808250760Smelifaro /* update the cache */ 809250760Smelifaro if (num != IP_FW_TABLEARG) { 810250760Smelifaro f->next_rule = (void *)(uintptr_t)f_pos; 811250760Smelifaro f->x_next = (void *)(uintptr_t)chain->id; 812250760Smelifaro } 813250760Smelifaro } 814250760Smelifaro 815250760Smelifaro return (f_pos); 816250760Smelifaro} 817250760Smelifaro 818250760Smelifaro/* 81998943Sluigi * The main check routine for the firewall. 82098943Sluigi * 82198943Sluigi * All arguments are in args so we can modify them and return them 82298943Sluigi * back to the caller. 82398943Sluigi * 82498943Sluigi * Parameters: 82598943Sluigi * 82698943Sluigi * args->m (in/out) The packet; we set to NULL when/if we nuke it. 82798943Sluigi * Starts with the IP header. 828200601Sluigi * args->eh (in) Mac header if present, NULL for layer3 packet. 829165738Sjulian * args->L3offset Number of bytes bypassed if we came from L2. 830165738Sjulian * e.g. often sizeof(eh) ** NOTYET ** 831200601Sluigi * args->oif Outgoing interface, NULL if packet is incoming. 83298943Sluigi * The incoming interface is in the mbuf. (in) 83398943Sluigi * args->divert_rule (in/out) 83498943Sluigi * Skip up to the first rule past this rule number; 83598943Sluigi * upon return, non-zero port number for divert or tee. 83698943Sluigi * 83798943Sluigi * args->rule Pointer to the last matching rule (in/out) 83898943Sluigi * args->next_hop Socket we are forwarding to (out). 839225044Sbz * args->next_hop6 IPv6 next hop we are forwarding to (out). 84098943Sluigi * args->f_id Addresses grabbed from the packet (out) 841201527Sluigi * args->rule.info a cookie depending on rule action 84298943Sluigi * 84398943Sluigi * Return value: 84498943Sluigi * 845140224Sglebius * IP_FW_PASS the packet must be accepted 846140224Sglebius * IP_FW_DENY the packet must be dropped 847140224Sglebius * IP_FW_DIVERT divert packet, port in m_tag 848140224Sglebius * IP_FW_TEE tee packet, port in m_tag 849140224Sglebius * IP_FW_DUMMYNET to dummynet, pipe in args->cookie 850140224Sglebius * IP_FW_NETGRAPH into netgraph, cookie args->cookie 851201527Sluigi * args->rule contains the matching rule, 852201527Sluigi * args->rule.info has additional information. 85398943Sluigi * 85498943Sluigi */ 855133920Sandreint 85698943Sluigiipfw_chk(struct ip_fw_args *args) 85798943Sluigi{ 858183550Szec 85998943Sluigi /* 860200601Sluigi * Local variables holding state while processing a packet: 86198943Sluigi * 86298943Sluigi * IMPORTANT NOTE: to speed up the processing of rules, there 86398943Sluigi * are some assumption on the values of the variables, which 86498943Sluigi * are documented here. Should you change them, please check 86598943Sluigi * the implementation of the various instructions to make sure 86698943Sluigi * that they still work. 867101978Sluigi * 86898943Sluigi * args->eh The MAC header. It is non-null for a layer2 86998943Sluigi * packet, it is NULL for a layer-3 packet. 870165738Sjulian * **notyet** 871165738Sjulian * args->L3offset Offset in the packet to the L3 (IP or equiv.) header. 87298943Sluigi * 87398943Sluigi * m | args->m Pointer to the mbuf, as received from the caller. 87498943Sluigi * It may change if ipfw_chk() does an m_pullup, or if it 87598943Sluigi * consumes the packet because it calls send_reject(). 87698943Sluigi * XXX This has to change, so that ipfw_chk() never modifies 87798943Sluigi * or consumes the buffer. 878165738Sjulian * ip is the beginning of the ip(4 or 6) header. 879165738Sjulian * Calculated by adding the L3offset to the start of data. 880165738Sjulian * (Until we start using L3offset, the packet is 881165738Sjulian * supposed to start with the ip header). 88298943Sluigi */ 88398943Sluigi struct mbuf *m = args->m; 88498943Sluigi struct ip *ip = mtod(m, struct ip *); 88598943Sluigi 88698943Sluigi /* 887130363Scsjp * For rules which contain uid/gid or jail constraints, cache 888130363Scsjp * a copy of the users credentials after the pcb lookup has been 889130363Scsjp * executed. This will speed up the processing of rules with 890130363Scsjp * these types of constraints, as well as decrease contention 891130363Scsjp * on pcb related locks. 892130363Scsjp */ 893204591Sluigi#ifndef __FreeBSD__ 894204591Sluigi struct bsd_ucred ucred_cache; 895204591Sluigi#else 896194498Sbrooks struct ucred *ucred_cache = NULL; 897204591Sluigi#endif 898194498Sbrooks int ucred_lookup = 0; 899130363Scsjp 900130363Scsjp /* 90198943Sluigi * oif | args->oif If NULL, ipfw_chk has been called on the 902150636Smlaier * inbound path (ether_input, ip_input). 90398943Sluigi * If non-NULL, ipfw_chk has been called on the outbound path 90498943Sluigi * (ether_output, ip_output). 90598943Sluigi */ 90698943Sluigi struct ifnet *oif = args->oif; 90798943Sluigi 908200855Sluigi int f_pos = 0; /* index of current rule in the array */ 90998943Sluigi int retval = 0; 91098943Sluigi 91198943Sluigi /* 912147758Smlaier * hlen The length of the IP header. 91398943Sluigi */ 91498943Sluigi u_int hlen = 0; /* hlen >0 means we have an IP pkt */ 91598943Sluigi 91698943Sluigi /* 91798943Sluigi * offset The offset of a fragment. offset != 0 means that 91898943Sluigi * we have a fragment at this offset of an IPv4 packet. 91998943Sluigi * offset == 0 means that (if this is an IPv4 packet) 92098943Sluigi * this is the first or only fragment. 921225032Sbz * For IPv6 offset|ip6f_mf == 0 means there is no Fragment Header 922225032Sbz * or there is a single packet fragement (fragement header added 923225032Sbz * without needed). We will treat a single packet fragment as if 924225032Sbz * there was no fragment header (or log/block depending on the 925225030Sbz * V_fw_permit_single_frag6 sysctl setting). 92698943Sluigi */ 92798943Sluigi u_short offset = 0; 928225032Sbz u_short ip6f_mf = 0; 92998943Sluigi 93098943Sluigi /* 93198943Sluigi * Local copies of addresses. They are only valid if we have 93298943Sluigi * an IP packet. 93398943Sluigi * 93498943Sluigi * proto The protocol. Set to 0 for non-ip packets, 93598943Sluigi * or to the protocol read from the packet otherwise. 93698943Sluigi * proto != 0 means that we have an IPv4 packet. 93798943Sluigi * 93898943Sluigi * src_port, dst_port port numbers, in HOST format. Only 93998943Sluigi * valid for TCP and UDP packets. 94098943Sluigi * 94198943Sluigi * src_ip, dst_ip ip addresses, in NETWORK format. 94298943Sluigi * Only valid for IPv4 packets. 94398943Sluigi */ 944201122Sluigi uint8_t proto; 945201122Sluigi uint16_t src_port = 0, dst_port = 0; /* NOTE: host format */ 94698943Sluigi struct in_addr src_ip, dst_ip; /* NOTE: network format */ 947201122Sluigi uint16_t iplen=0; 948115750Skbyanc int pktlen; 949201122Sluigi uint16_t etype = 0; /* Host order stored ether type */ 950145093Sbrooks 951145093Sbrooks /* 952145093Sbrooks * dyn_dir = MATCH_UNKNOWN when rules unchecked, 953145093Sbrooks * MATCH_NONE when checked and not matched (q = NULL), 954145093Sbrooks * MATCH_FORWARD or MATCH_REVERSE otherwise (q != NULL) 955145093Sbrooks */ 95698943Sluigi int dyn_dir = MATCH_UNKNOWN; 95798943Sluigi ipfw_dyn_rule *q = NULL; 958181803Sbz struct ip_fw_chain *chain = &V_layer3_chain; 95998943Sluigi 96098943Sluigi /* 961145093Sbrooks * We store in ulp a pointer to the upper layer protocol header. 962145093Sbrooks * In the ipv4 case this is easy to determine from the header, 963145093Sbrooks * but for ipv6 we might have some additional headers in the middle. 964145093Sbrooks * ulp is NULL if not found. 96598943Sluigi */ 966145093Sbrooks void *ulp = NULL; /* upper layer protocol pointer. */ 967205173Sluigi 968145246Sbrooks /* XXX ipv6 variables */ 969145246Sbrooks int is_ipv6 = 0; 970205173Sluigi uint8_t icmp6_type = 0; 971205173Sluigi uint16_t ext_hd = 0; /* bits vector for extension header filtering */ 972145246Sbrooks /* end of ipv6 variables */ 973205173Sluigi 974146894Smlaier int is_ipv4 = 0; 97598943Sluigi 976200059Sluigi int done = 0; /* flag to exit the outer loop */ 977200059Sluigi 978196423Sjulian if (m->m_flags & M_SKIP_FIREWALL || (! V_ipfw_vnet_ready)) 979145093Sbrooks return (IP_FW_PASS); /* accept */ 980145093Sbrooks 981187822Sluigi dst_ip.s_addr = 0; /* make sure it is initialized */ 982200040Sluigi src_ip.s_addr = 0; /* make sure it is initialized */ 983115750Skbyanc pktlen = m->m_pkthdr.len; 984178888Sjulian args->f_id.fib = M_GETFIB(m); /* note mbuf not altered) */ 985145093Sbrooks proto = args->f_id.proto = 0; /* mark f_id invalid */ 986149020Sbz /* XXX 0 is a valid proto: IP/IPv6 Hop-by-Hop Option */ 98798943Sluigi 988145093Sbrooks/* 989145093Sbrooks * PULLUP_TO(len, p, T) makes sure that len + sizeof(T) is contiguous, 990145093Sbrooks * then it sets p to point at the offset "len" in the mbuf. WARNING: the 991145093Sbrooks * pointer might become stale after other pullups (but we never use it 992145093Sbrooks * this way). 993145093Sbrooks */ 994220796Sglebius#define PULLUP_TO(_len, p, T) PULLUP_LEN(_len, p, sizeof(T)) 995220796Sglebius#define PULLUP_LEN(_len, p, T) \ 996200601Sluigido { \ 997220796Sglebius int x = (_len) + T; \ 998200601Sluigi if ((m)->m_len < x) { \ 999200601Sluigi args->m = m = m_pullup(m, x); \ 1000200601Sluigi if (m == NULL) \ 1001200601Sluigi goto pullup_failed; \ 1002200601Sluigi } \ 1003200601Sluigi p = (mtod(m, char *) + (_len)); \ 1004145093Sbrooks} while (0) 100598943Sluigi 1006165738Sjulian /* 1007165738Sjulian * if we have an ether header, 1008165738Sjulian */ 1009165738Sjulian if (args->eh) 1010165738Sjulian etype = ntohs(args->eh->ether_type); 1011165738Sjulian 1012145246Sbrooks /* Identify IP packets and fill up variables. */ 1013145246Sbrooks if (pktlen >= sizeof(struct ip6_hdr) && 1014165738Sjulian (args->eh == NULL || etype == ETHERTYPE_IPV6) && ip->ip_v == 6) { 1015165738Sjulian struct ip6_hdr *ip6 = (struct ip6_hdr *)ip; 1016145246Sbrooks is_ipv6 = 1; 1017145246Sbrooks args->f_id.addr_type = 6; 1018145246Sbrooks hlen = sizeof(struct ip6_hdr); 1019165738Sjulian proto = ip6->ip6_nxt; 1020145246Sbrooks 1021145246Sbrooks /* Search extension headers to find upper layer protocols */ 1022225033Sbz while (ulp == NULL && offset == 0) { 1023145246Sbrooks switch (proto) { 1024145246Sbrooks case IPPROTO_ICMPV6: 1025145246Sbrooks PULLUP_TO(hlen, ulp, struct icmp6_hdr); 1026205173Sluigi icmp6_type = ICMP6(ulp)->icmp6_type; 1027145246Sbrooks break; 1028145246Sbrooks 1029145246Sbrooks case IPPROTO_TCP: 1030145246Sbrooks PULLUP_TO(hlen, ulp, struct tcphdr); 1031145246Sbrooks dst_port = TCP(ulp)->th_dport; 1032145246Sbrooks src_port = TCP(ulp)->th_sport; 1033205173Sluigi /* save flags for dynamic rules */ 1034205173Sluigi args->f_id._flags = TCP(ulp)->th_flags; 1035145246Sbrooks break; 1036145246Sbrooks 1037164258Sbz case IPPROTO_SCTP: 1038164258Sbz PULLUP_TO(hlen, ulp, struct sctphdr); 1039164258Sbz src_port = SCTP(ulp)->src_port; 1040164258Sbz dst_port = SCTP(ulp)->dest_port; 1041164258Sbz break; 1042164258Sbz 1043145246Sbrooks case IPPROTO_UDP: 1044145246Sbrooks PULLUP_TO(hlen, ulp, struct udphdr); 1045145246Sbrooks dst_port = UDP(ulp)->uh_dport; 1046145246Sbrooks src_port = UDP(ulp)->uh_sport; 1047145246Sbrooks break; 1048145246Sbrooks 1049149020Sbz case IPPROTO_HOPOPTS: /* RFC 2460 */ 1050145246Sbrooks PULLUP_TO(hlen, ulp, struct ip6_hbh); 1051145246Sbrooks ext_hd |= EXT_HOPOPTS; 1052149020Sbz hlen += (((struct ip6_hbh *)ulp)->ip6h_len + 1) << 3; 1053145246Sbrooks proto = ((struct ip6_hbh *)ulp)->ip6h_nxt; 1054145246Sbrooks ulp = NULL; 1055145246Sbrooks break; 1056145246Sbrooks 1057149020Sbz case IPPROTO_ROUTING: /* RFC 2460 */ 1058145246Sbrooks PULLUP_TO(hlen, ulp, struct ip6_rthdr); 1059159857Sume switch (((struct ip6_rthdr *)ulp)->ip6r_type) { 1060159857Sume case 0: 1061169245Sbz ext_hd |= EXT_RTHDR0; 1062159857Sume break; 1063169245Sbz case 2: 1064169245Sbz ext_hd |= EXT_RTHDR2; 1065169245Sbz break; 1066159857Sume default: 1067225036Sbz if (V_fw_verbose) 1068225036Sbz printf("IPFW2: IPV6 - Unknown " 1069225036Sbz "Routing Header type(%d)\n", 1070225036Sbz ((struct ip6_rthdr *) 1071225036Sbz ulp)->ip6r_type); 1072181803Sbz if (V_fw_deny_unknown_exthdrs) 1073149020Sbz return (IP_FW_DENY); 1074149020Sbz break; 1075149020Sbz } 1076145246Sbrooks ext_hd |= EXT_ROUTING; 1077149020Sbz hlen += (((struct ip6_rthdr *)ulp)->ip6r_len + 1) << 3; 1078145246Sbrooks proto = ((struct ip6_rthdr *)ulp)->ip6r_nxt; 1079145246Sbrooks ulp = NULL; 1080145246Sbrooks break; 1081145246Sbrooks 1082149020Sbz case IPPROTO_FRAGMENT: /* RFC 2460 */ 1083145246Sbrooks PULLUP_TO(hlen, ulp, struct ip6_frag); 1084145246Sbrooks ext_hd |= EXT_FRAGMENT; 1085145246Sbrooks hlen += sizeof (struct ip6_frag); 1086145246Sbrooks proto = ((struct ip6_frag *)ulp)->ip6f_nxt; 1087149020Sbz offset = ((struct ip6_frag *)ulp)->ip6f_offlg & 1088149020Sbz IP6F_OFF_MASK; 1089225032Sbz ip6f_mf = ((struct ip6_frag *)ulp)->ip6f_offlg & 1090149020Sbz IP6F_MORE_FRAG; 1091225030Sbz if (V_fw_permit_single_frag6 == 0 && 1092225032Sbz offset == 0 && ip6f_mf == 0) { 1093225036Sbz if (V_fw_verbose) 1094225036Sbz printf("IPFW2: IPV6 - Invalid " 1095225036Sbz "Fragment Header\n"); 1096181803Sbz if (V_fw_deny_unknown_exthdrs) 1097149020Sbz return (IP_FW_DENY); 1098149020Sbz break; 1099149020Sbz } 1100205173Sluigi args->f_id.extra = 1101149020Sbz ntohl(((struct ip6_frag *)ulp)->ip6f_ident); 1102149020Sbz ulp = NULL; 1103145246Sbrooks break; 1104145246Sbrooks 1105149020Sbz case IPPROTO_DSTOPTS: /* RFC 2460 */ 1106149020Sbz PULLUP_TO(hlen, ulp, struct ip6_hbh); 1107149020Sbz ext_hd |= EXT_DSTOPTS; 1108149020Sbz hlen += (((struct ip6_hbh *)ulp)->ip6h_len + 1) << 3; 1109149020Sbz proto = ((struct ip6_hbh *)ulp)->ip6h_nxt; 1110149020Sbz ulp = NULL; 1111149020Sbz break; 1112149020Sbz 1113149020Sbz case IPPROTO_AH: /* RFC 2402 */ 1114145246Sbrooks PULLUP_TO(hlen, ulp, struct ip6_ext); 1115145246Sbrooks ext_hd |= EXT_AH; 1116149020Sbz hlen += (((struct ip6_ext *)ulp)->ip6e_len + 2) << 2; 1117145246Sbrooks proto = ((struct ip6_ext *)ulp)->ip6e_nxt; 1118145246Sbrooks ulp = NULL; 1119145246Sbrooks break; 1120145246Sbrooks 1121149020Sbz case IPPROTO_ESP: /* RFC 2406 */ 1122149020Sbz PULLUP_TO(hlen, ulp, uint32_t); /* SPI, Seq# */ 1123149020Sbz /* Anything past Seq# is variable length and 1124149020Sbz * data past this ext. header is encrypted. */ 1125149020Sbz ext_hd |= EXT_ESP; 1126149020Sbz break; 1127149020Sbz 1128149020Sbz case IPPROTO_NONE: /* RFC 2460 */ 1129174479Sdwmalone /* 1130174479Sdwmalone * Packet ends here, and IPv6 header has 1131174479Sdwmalone * already been pulled up. If ip6e_len!=0 1132174479Sdwmalone * then octets must be ignored. 1133174479Sdwmalone */ 1134174479Sdwmalone ulp = ip; /* non-NULL to get out of loop. */ 1135149020Sbz break; 1136149020Sbz 1137146704Stanimura case IPPROTO_OSPFIGP: 1138146704Stanimura /* XXX OSPF header check? */ 1139146704Stanimura PULLUP_TO(hlen, ulp, struct ip6_ext); 1140146704Stanimura break; 1141146704Stanimura 1142161767Sjhay case IPPROTO_PIM: 1143161767Sjhay /* XXX PIM header check? */ 1144161767Sjhay PULLUP_TO(hlen, ulp, struct pim); 1145161767Sjhay break; 1146161767Sjhay 1147163069Sbz case IPPROTO_CARP: 1148163069Sbz PULLUP_TO(hlen, ulp, struct carp_header); 1149163069Sbz if (((struct carp_header *)ulp)->carp_version != 1150163069Sbz CARP_VERSION) 1151163069Sbz return (IP_FW_DENY); 1152163069Sbz if (((struct carp_header *)ulp)->carp_type != 1153163069Sbz CARP_ADVERTISEMENT) 1154163069Sbz return (IP_FW_DENY); 1155163069Sbz break; 1156163069Sbz 1157159857Sume case IPPROTO_IPV6: /* RFC 2893 */ 1158159857Sume PULLUP_TO(hlen, ulp, struct ip6_hdr); 1159159857Sume break; 1160159857Sume 1161159857Sume case IPPROTO_IPV4: /* RFC 2893 */ 1162159857Sume PULLUP_TO(hlen, ulp, struct ip); 1163159857Sume break; 1164159857Sume 1165145246Sbrooks default: 1166225036Sbz if (V_fw_verbose) 1167225036Sbz printf("IPFW2: IPV6 - Unknown " 1168225036Sbz "Extension Header(%d), ext_hd=%x\n", 1169225036Sbz proto, ext_hd); 1170181803Sbz if (V_fw_deny_unknown_exthdrs) 1171149020Sbz return (IP_FW_DENY); 1172159857Sume PULLUP_TO(hlen, ulp, struct ip6_ext); 1173145246Sbrooks break; 1174145246Sbrooks } /*switch */ 1175145246Sbrooks } 1176165738Sjulian ip = mtod(m, struct ip *); 1177165738Sjulian ip6 = (struct ip6_hdr *)ip; 1178165738Sjulian args->f_id.src_ip6 = ip6->ip6_src; 1179165738Sjulian args->f_id.dst_ip6 = ip6->ip6_dst; 1180145246Sbrooks args->f_id.src_ip = 0; 1181145246Sbrooks args->f_id.dst_ip = 0; 1182165738Sjulian args->f_id.flow_id6 = ntohl(ip6->ip6_flow); 1183145246Sbrooks } else if (pktlen >= sizeof(struct ip) && 1184165738Sjulian (args->eh == NULL || etype == ETHERTYPE_IP) && ip->ip_v == 4) { 1185146894Smlaier is_ipv4 = 1; 1186145093Sbrooks hlen = ip->ip_hl << 2; 1187145093Sbrooks args->f_id.addr_type = 4; 118898943Sluigi 1189145093Sbrooks /* 1190145093Sbrooks * Collect parameters into local variables for faster matching. 1191145093Sbrooks */ 1192145093Sbrooks proto = ip->ip_p; 1193145093Sbrooks src_ip = ip->ip_src; 1194145093Sbrooks dst_ip = ip->ip_dst; 1195201527Sluigi offset = ntohs(ip->ip_off) & IP_OFFMASK; 1196201527Sluigi iplen = ntohs(ip->ip_len); 1197201122Sluigi pktlen = iplen < pktlen ? iplen : pktlen; 119898943Sluigi 1199145093Sbrooks if (offset == 0) { 1200145093Sbrooks switch (proto) { 1201145093Sbrooks case IPPROTO_TCP: 1202145093Sbrooks PULLUP_TO(hlen, ulp, struct tcphdr); 1203145093Sbrooks dst_port = TCP(ulp)->th_dport; 1204145093Sbrooks src_port = TCP(ulp)->th_sport; 1205205173Sluigi /* save flags for dynamic rules */ 1206205173Sluigi args->f_id._flags = TCP(ulp)->th_flags; 1207145093Sbrooks break; 120898943Sluigi 1209220211Sae case IPPROTO_SCTP: 1210220211Sae PULLUP_TO(hlen, ulp, struct sctphdr); 1211220211Sae src_port = SCTP(ulp)->src_port; 1212220211Sae dst_port = SCTP(ulp)->dest_port; 1213220211Sae break; 1214220211Sae 1215145093Sbrooks case IPPROTO_UDP: 1216145093Sbrooks PULLUP_TO(hlen, ulp, struct udphdr); 1217145093Sbrooks dst_port = UDP(ulp)->uh_dport; 1218145093Sbrooks src_port = UDP(ulp)->uh_sport; 1219145093Sbrooks break; 122098943Sluigi 1221145093Sbrooks case IPPROTO_ICMP: 1222145565Sbrooks PULLUP_TO(hlen, ulp, struct icmphdr); 1223205173Sluigi //args->f_id.flags = ICMP(ulp)->icmp_type; 1224145093Sbrooks break; 122598943Sluigi 1226145093Sbrooks default: 1227145093Sbrooks break; 122898943Sluigi } 1229145093Sbrooks } 123098943Sluigi 1231165738Sjulian ip = mtod(m, struct ip *); 1232145093Sbrooks args->f_id.src_ip = ntohl(src_ip.s_addr); 1233145093Sbrooks args->f_id.dst_ip = ntohl(dst_ip.s_addr); 1234145093Sbrooks } 123598943Sluigi#undef PULLUP_TO 1236145093Sbrooks if (proto) { /* we may have port numbers, store them */ 1237145093Sbrooks args->f_id.proto = proto; 1238145093Sbrooks args->f_id.src_port = src_port = ntohs(src_port); 1239145093Sbrooks args->f_id.dst_port = dst_port = ntohs(dst_port); 124098943Sluigi } 124198943Sluigi 1242138642Scsjp IPFW_RLOCK(chain); 1243197952Sjulian if (! V_ipfw_vnet_ready) { /* shutting down, leave NOW. */ 1244197952Sjulian IPFW_RUNLOCK(chain); 1245197952Sjulian return (IP_FW_PASS); /* accept */ 1246197952Sjulian } 1247201527Sluigi if (args->rule.slot) { 124898943Sluigi /* 1249200629Sluigi * Packet has already been tagged as a result of a previous 1250200629Sluigi * match on rule args->rule aka args->rule_id (PIPE, QUEUE, 1251201527Sluigi * REASS, NETGRAPH, DIVERT/TEE...) 1252200855Sluigi * Validate the slot and continue from the next one 1253200855Sluigi * if still present, otherwise do a lookup. 125498943Sluigi */ 1255201527Sluigi f_pos = (args->rule.chain_id == chain->id) ? 1256201527Sluigi args->rule.slot : 1257201527Sluigi ipfw_find_rule(chain, args->rule.rulenum, 1258201527Sluigi args->rule.rule_id); 125998943Sluigi } else { 1260200855Sluigi f_pos = 0; 126198943Sluigi } 126298943Sluigi 126398943Sluigi /* 126498943Sluigi * Now scan the rules, and parse microinstructions for each rule. 1265200059Sluigi * We have two nested loops and an inner switch. Sometimes we 1266200059Sluigi * need to break out of one or both loops, or re-enter one of 1267200059Sluigi * the loops with updated variables. Loop variables are: 1268200059Sluigi * 1269200855Sluigi * f_pos (outer loop) points to the current rule. 1270200059Sluigi * On output it points to the matching rule. 1271200059Sluigi * done (outer loop) is used as a flag to break the loop. 1272200059Sluigi * l (inner loop) residual length of current rule. 1273200059Sluigi * cmd points to the current microinstruction. 1274200059Sluigi * 1275200059Sluigi * We break the inner loop by setting l=0 and possibly 1276200059Sluigi * cmdlen=0 if we don't want to advance cmd. 1277200059Sluigi * We break the outer loop by setting done=1 1278200855Sluigi * We can restart the inner loop by setting l>0 and f_pos, f, cmd 1279200059Sluigi * as needed. 128098943Sluigi */ 1281200855Sluigi for (; f_pos < chain->n_rules; f_pos++) { 128298943Sluigi ipfw_insn *cmd; 1283153374Sglebius uint32_t tablearg = 0; 1284153374Sglebius int l, cmdlen, skip_or; /* skip rest of OR block */ 1285200855Sluigi struct ip_fw *f; 128698943Sluigi 1287200855Sluigi f = chain->map[f_pos]; 1288181803Sbz if (V_set_disable & (1 << f->set) ) 1289101628Sluigi continue; 1290101628Sluigi 129198943Sluigi skip_or = 0; 129298943Sluigi for (l = f->cmd_len, cmd = f->cmd ; l > 0 ; 129398943Sluigi l -= cmdlen, cmd += cmdlen) { 129499622Sluigi int match; 129598943Sluigi 129698943Sluigi /* 129798943Sluigi * check_body is a jump target used when we find a 129898943Sluigi * CHECK_STATE, and need to jump to the body of 129998943Sluigi * the target rule. 130098943Sluigi */ 130198943Sluigi 1302200059Sluigi/* check_body: */ 130398943Sluigi cmdlen = F_LEN(cmd); 130498943Sluigi /* 130598943Sluigi * An OR block (insn_1 || .. || insn_n) has the 130698943Sluigi * F_OR bit set in all but the last instruction. 130798943Sluigi * The first match will set "skip_or", and cause 130898943Sluigi * the following instructions to be skipped until 130998943Sluigi * past the one with the F_OR bit clear. 131098943Sluigi */ 131198943Sluigi if (skip_or) { /* skip this instruction */ 131298943Sluigi if ((cmd->len & F_OR) == 0) 131398943Sluigi skip_or = 0; /* next one is good */ 131498943Sluigi continue; 131598943Sluigi } 131699622Sluigi match = 0; /* set to 1 if we succeed */ 131799622Sluigi 131898943Sluigi switch (cmd->opcode) { 131999622Sluigi /* 132099622Sluigi * The first set of opcodes compares the packet's 132199622Sluigi * fields with some pattern, setting 'match' if a 132299622Sluigi * match is found. At the end of the loop there is 132399622Sluigi * logic to deal with F_NOT and F_OR flags associated 132499622Sluigi * with the opcode. 132599622Sluigi */ 132698943Sluigi case O_NOP: 132799622Sluigi match = 1; 132899622Sluigi break; 132998943Sluigi 133098943Sluigi case O_FORWARD_MAC: 133198943Sluigi printf("ipfw: opcode %d unimplemented\n", 133298943Sluigi cmd->opcode); 133399622Sluigi break; 133498943Sluigi 133598943Sluigi case O_GID: 133698943Sluigi case O_UID: 1337133600Scsjp case O_JAIL: 133898943Sluigi /* 133998943Sluigi * We only check offset == 0 && proto != 0, 1340145246Sbrooks * as this ensures that we have a 134198943Sluigi * packet with the ports info. 134298943Sluigi */ 1343223073Sae if (offset != 0) 134499622Sluigi break; 1345122265Ssam if (proto == IPPROTO_TCP || 1346122265Ssam proto == IPPROTO_UDP) 1347122265Ssam match = check_uidgid( 1348122265Ssam (ipfw_insn_u32 *)cmd, 1349223073Sae args, &ucred_lookup, 1350204591Sluigi#ifdef __FreeBSD__ 1351223073Sae &ucred_cache); 1352204591Sluigi#else 1353223073Sae (void *)&ucred_cache); 1354204591Sluigi#endif 135599622Sluigi break; 135698943Sluigi 135798943Sluigi case O_RECV: 135899622Sluigi match = iface_match(m->m_pkthdr.rcvif, 1359234597Smelifaro (ipfw_insn_if *)cmd, chain, &tablearg); 136099622Sluigi break; 136198943Sluigi 136298943Sluigi case O_XMIT: 1363234597Smelifaro match = iface_match(oif, (ipfw_insn_if *)cmd, 1364234597Smelifaro chain, &tablearg); 136599622Sluigi break; 136698943Sluigi 136798943Sluigi case O_VIA: 136899622Sluigi match = iface_match(oif ? oif : 1369234597Smelifaro m->m_pkthdr.rcvif, (ipfw_insn_if *)cmd, 1370234597Smelifaro chain, &tablearg); 137199622Sluigi break; 137298943Sluigi 137398943Sluigi case O_MACADDR2: 137498943Sluigi if (args->eh != NULL) { /* have MAC header */ 137598943Sluigi u_int32_t *want = (u_int32_t *) 137698943Sluigi ((ipfw_insn_mac *)cmd)->addr; 137798943Sluigi u_int32_t *mask = (u_int32_t *) 137898943Sluigi ((ipfw_insn_mac *)cmd)->mask; 137998943Sluigi u_int32_t *hdr = (u_int32_t *)args->eh; 138098943Sluigi 138199622Sluigi match = 138299622Sluigi ( want[0] == (hdr[0] & mask[0]) && 138399622Sluigi want[1] == (hdr[1] & mask[1]) && 138499622Sluigi want[2] == (hdr[2] & mask[2]) ); 138598943Sluigi } 138699622Sluigi break; 138798943Sluigi 138898943Sluigi case O_MAC_TYPE: 138998943Sluigi if (args->eh != NULL) { 139098943Sluigi u_int16_t *p = 139198943Sluigi ((ipfw_insn_u16 *)cmd)->ports; 139298943Sluigi int i; 139398943Sluigi 139499622Sluigi for (i = cmdlen - 1; !match && i>0; 139599622Sluigi i--, p += 2) 1396165738Sjulian match = (etype >= p[0] && 1397165738Sjulian etype <= p[1]); 139898943Sluigi } 139999622Sluigi break; 140098943Sluigi 140198943Sluigi case O_FRAG: 1402145246Sbrooks match = (offset != 0); 140399622Sluigi break; 140498943Sluigi 140598943Sluigi case O_IN: /* "out" is "not in" */ 140699622Sluigi match = (oif == NULL); 140799622Sluigi break; 140898943Sluigi 140998943Sluigi case O_LAYER2: 141099622Sluigi match = (args->eh != NULL); 141199622Sluigi break; 141298943Sluigi 1413136073Sgreen case O_DIVERTED: 1414201527Sluigi { 1415201527Sluigi /* For diverted packets, args->rule.info 1416201527Sluigi * contains the divert port (in host format) 1417201527Sluigi * reason and direction. 1418210120Sluigi */ 1419201527Sluigi uint32_t i = args->rule.info; 1420201527Sluigi match = (i&IPFW_IS_MASK) == IPFW_IS_DIVERT && 1421201527Sluigi cmd->arg1 & ((i & IPFW_INFO_IN) ? 1 : 2); 1422201527Sluigi } 1423136073Sgreen break; 1424136073Sgreen 142598943Sluigi case O_PROTO: 142698943Sluigi /* 142798943Sluigi * We do not allow an arg of 0 so the 142898943Sluigi * check of "proto" only suffices. 142998943Sluigi */ 143099622Sluigi match = (proto == cmd->arg1); 143199622Sluigi break; 143298943Sluigi 143398943Sluigi case O_IP_SRC: 1434147758Smlaier match = is_ipv4 && 1435147758Smlaier (((ipfw_insn_ip *)cmd)->addr.s_addr == 143699622Sluigi src_ip.s_addr); 143799622Sluigi break; 1438105775Smaxim 1439130281Sru case O_IP_SRC_LOOKUP: 1440130281Sru case O_IP_DST_LOOKUP: 1441147758Smlaier if (is_ipv4) { 1442201122Sluigi uint32_t key = 1443130281Sru (cmd->opcode == O_IP_DST_LOOKUP) ? 1444130281Sru dst_ip.s_addr : src_ip.s_addr; 1445187822Sluigi uint32_t v = 0; 1446130281Sru 1447200567Sluigi if (cmdlen > F_INSN_SIZE(ipfw_insn_u32)) { 1448201122Sluigi /* generic lookup. The key must be 1449201122Sluigi * in 32bit big-endian format. 1450201122Sluigi */ 1451200567Sluigi v = ((ipfw_insn_u32 *)cmd)->d[1]; 1452200567Sluigi if (v == 0) 1453201122Sluigi key = dst_ip.s_addr; 1454200567Sluigi else if (v == 1) 1455201122Sluigi key = src_ip.s_addr; 1456205173Sluigi else if (v == 6) /* dscp */ 1457205173Sluigi key = (ip->ip_tos >> 2) & 0x3f; 1458200567Sluigi else if (offset != 0) 1459200567Sluigi break; 1460200567Sluigi else if (proto != IPPROTO_TCP && 1461200567Sluigi proto != IPPROTO_UDP) 1462200567Sluigi break; 1463200567Sluigi else if (v == 2) 1464201122Sluigi key = htonl(dst_port); 1465200567Sluigi else if (v == 3) 1466201150Sluigi key = htonl(src_port); 1467200567Sluigi else if (v == 4 || v == 5) { 1468200567Sluigi check_uidgid( 1469200567Sluigi (ipfw_insn_u32 *)cmd, 1470223073Sae args, &ucred_lookup, 1471204591Sluigi#ifdef __FreeBSD__ 1472223073Sae &ucred_cache); 1473200567Sluigi if (v == 4 /* O_UID */) 1474201122Sluigi key = ucred_cache->cr_uid; 1475200567Sluigi else if (v == 5 /* O_JAIL */) 1476201122Sluigi key = ucred_cache->cr_prison->pr_id; 1477204591Sluigi#else /* !__FreeBSD__ */ 1478223073Sae (void *)&ucred_cache); 1479204591Sluigi if (v ==4 /* O_UID */) 1480204591Sluigi key = ucred_cache.uid; 1481204591Sluigi else if (v == 5 /* O_JAIL */) 1482204591Sluigi key = ucred_cache.xid; 1483204591Sluigi#endif /* !__FreeBSD__ */ 1484201122Sluigi key = htonl(key); 1485200567Sluigi } else 1486200567Sluigi break; 1487200567Sluigi } 1488201122Sluigi match = ipfw_lookup_table(chain, 1489201122Sluigi cmd->arg1, key, &v); 1490130281Sru if (!match) 1491130281Sru break; 1492130281Sru if (cmdlen == F_INSN_SIZE(ipfw_insn_u32)) 1493130281Sru match = 1494130281Sru ((ipfw_insn_u32 *)cmd)->d[0] == v; 1495153374Sglebius else 1496153374Sglebius tablearg = v; 1497234597Smelifaro } else if (is_ipv6) { 1498234597Smelifaro uint32_t v = 0; 1499234597Smelifaro void *pkey = (cmd->opcode == O_IP_DST_LOOKUP) ? 1500234597Smelifaro &args->f_id.dst_ip6: &args->f_id.src_ip6; 1501234597Smelifaro match = ipfw_lookup_table_extended(chain, 1502234597Smelifaro cmd->arg1, pkey, &v, 1503234597Smelifaro IPFW_TABLE_CIDR); 1504234597Smelifaro if (cmdlen == F_INSN_SIZE(ipfw_insn_u32)) 1505234597Smelifaro match = ((ipfw_insn_u32 *)cmd)->d[0] == v; 1506234597Smelifaro if (match) 1507234597Smelifaro tablearg = v; 1508130281Sru } 1509130281Sru break; 1510130281Sru 151198943Sluigi case O_IP_SRC_MASK: 1512117327Sluigi case O_IP_DST_MASK: 1513147758Smlaier if (is_ipv4) { 1514117327Sluigi uint32_t a = 1515117327Sluigi (cmd->opcode == O_IP_DST_MASK) ? 1516117327Sluigi dst_ip.s_addr : src_ip.s_addr; 1517117327Sluigi uint32_t *p = ((ipfw_insn_u32 *)cmd)->d; 1518117327Sluigi int i = cmdlen-1; 1519117327Sluigi 1520117327Sluigi for (; !match && i>0; i-= 2, p+= 2) 1521117327Sluigi match = (p[0] == (a & p[1])); 1522117327Sluigi } 152399622Sluigi break; 152498943Sluigi 152598943Sluigi case O_IP_SRC_ME: 1526147758Smlaier if (is_ipv4) { 152799622Sluigi struct ifnet *tif; 152898943Sluigi 152999622Sluigi INADDR_TO_IFP(src_ip, tif); 153099622Sluigi match = (tif != NULL); 1531202459Sume break; 153299622Sluigi } 1533204591Sluigi#ifdef INET6 1534202459Sume /* FALLTHROUGH */ 1535202459Sume case O_IP6_SRC_ME: 1536204591Sluigi match= is_ipv6 && search_ip6_addr_net(&args->f_id.src_ip6); 1537202459Sume#endif 153899622Sluigi break; 1539105775Smaxim 154098943Sluigi case O_IP_DST_SET: 154198943Sluigi case O_IP_SRC_SET: 1542147758Smlaier if (is_ipv4) { 154399622Sluigi u_int32_t *d = (u_int32_t *)(cmd+1); 154499622Sluigi u_int32_t addr = 154599622Sluigi cmd->opcode == O_IP_DST_SET ? 1546105886Sluigi args->f_id.dst_ip : 1547105886Sluigi args->f_id.src_ip; 154898943Sluigi 154999622Sluigi if (addr < d[0]) 155099622Sluigi break; 155199622Sluigi addr -= d[0]; /* subtract base */ 155299622Sluigi match = (addr < cmd->arg1) && 155399622Sluigi ( d[ 1 + (addr>>5)] & 155499622Sluigi (1<<(addr & 0x1f)) ); 155599622Sluigi } 155699622Sluigi break; 155798943Sluigi 155898943Sluigi case O_IP_DST: 1559147758Smlaier match = is_ipv4 && 1560147758Smlaier (((ipfw_insn_ip *)cmd)->addr.s_addr == 156199622Sluigi dst_ip.s_addr); 156299622Sluigi break; 156398943Sluigi 156498943Sluigi case O_IP_DST_ME: 1565147758Smlaier if (is_ipv4) { 156699622Sluigi struct ifnet *tif; 156799622Sluigi 156899622Sluigi INADDR_TO_IFP(dst_ip, tif); 156999622Sluigi match = (tif != NULL); 1570202459Sume break; 157199622Sluigi } 1572204591Sluigi#ifdef INET6 1573202459Sume /* FALLTHROUGH */ 1574202459Sume case O_IP6_DST_ME: 1575204591Sluigi match= is_ipv6 && search_ip6_addr_net(&args->f_id.dst_ip6); 1576202459Sume#endif 157799622Sluigi break; 1578105775Smaxim 1579204591Sluigi 158098943Sluigi case O_IP_SRCPORT: 158198943Sluigi case O_IP_DSTPORT: 158298943Sluigi /* 158398943Sluigi * offset == 0 && proto != 0 is enough 1584145246Sbrooks * to guarantee that we have a 158598943Sluigi * packet with port info. 158698943Sluigi */ 158799622Sluigi if ((proto==IPPROTO_UDP || proto==IPPROTO_TCP) 158899622Sluigi && offset == 0) { 158999622Sluigi u_int16_t x = 159098943Sluigi (cmd->opcode == O_IP_SRCPORT) ? 159199622Sluigi src_port : dst_port ; 159298943Sluigi u_int16_t *p = 159398943Sluigi ((ipfw_insn_u16 *)cmd)->ports; 159498943Sluigi int i; 159598943Sluigi 159699622Sluigi for (i = cmdlen - 1; !match && i>0; 159799622Sluigi i--, p += 2) 159899622Sluigi match = (x>=p[0] && x<=p[1]); 159998943Sluigi } 160099622Sluigi break; 160198943Sluigi 160298943Sluigi case O_ICMPTYPE: 160399622Sluigi match = (offset == 0 && proto==IPPROTO_ICMP && 1604145093Sbrooks icmptype_match(ICMP(ulp), (ipfw_insn_u32 *)cmd) ); 160599622Sluigi break; 160698943Sluigi 1607145266Sphk#ifdef INET6 1608145246Sbrooks case O_ICMP6TYPE: 1609145246Sbrooks match = is_ipv6 && offset == 0 && 1610145246Sbrooks proto==IPPROTO_ICMPV6 && 1611145246Sbrooks icmp6type_match( 1612145246Sbrooks ICMP6(ulp)->icmp6_type, 1613145246Sbrooks (ipfw_insn_u32 *)cmd); 1614145246Sbrooks break; 1615145266Sphk#endif /* INET6 */ 1616145246Sbrooks 161798943Sluigi case O_IPOPT: 1618147758Smlaier match = (is_ipv4 && 1619165738Sjulian ipopts_match(ip, cmd) ); 162099622Sluigi break; 162198943Sluigi 162298943Sluigi case O_IPVER: 1623147758Smlaier match = (is_ipv4 && 1624165738Sjulian cmd->arg1 == ip->ip_v); 162599622Sluigi break; 162698943Sluigi 1627116690Sluigi case O_IPID: 1628116690Sluigi case O_IPLEN: 162998943Sluigi case O_IPTTL: 1630147758Smlaier if (is_ipv4) { /* only for IP packets */ 1631116690Sluigi uint16_t x; 1632116690Sluigi uint16_t *p; 1633116690Sluigi int i; 163498943Sluigi 1635116690Sluigi if (cmd->opcode == O_IPLEN) 1636201122Sluigi x = iplen; 1637116690Sluigi else if (cmd->opcode == O_IPTTL) 1638165738Sjulian x = ip->ip_ttl; 1639116690Sluigi else /* must be IPID */ 1640165738Sjulian x = ntohs(ip->ip_id); 1641116690Sluigi if (cmdlen == 1) { 1642116690Sluigi match = (cmd->arg1 == x); 1643116690Sluigi break; 1644116690Sluigi } 1645116690Sluigi /* otherwise we have ranges */ 1646116690Sluigi p = ((ipfw_insn_u16 *)cmd)->ports; 1647116690Sluigi i = cmdlen - 1; 1648116690Sluigi for (; !match && i>0; i--, p += 2) 1649116690Sluigi match = (x >= p[0] && x <= p[1]); 1650116690Sluigi } 165199622Sluigi break; 165298943Sluigi 165399475Sluigi case O_IPPRECEDENCE: 1654147758Smlaier match = (is_ipv4 && 1655165738Sjulian (cmd->arg1 == (ip->ip_tos & 0xe0)) ); 165699622Sluigi break; 165799475Sluigi 165898943Sluigi case O_IPTOS: 1659147758Smlaier match = (is_ipv4 && 1660165738Sjulian flags_match(cmd, ip->ip_tos)); 166199622Sluigi break; 166298943Sluigi 1663250762Smelifaro case O_DSCP: 1664250762Smelifaro { 1665250762Smelifaro uint32_t *p; 1666250762Smelifaro uint16_t x; 1667250762Smelifaro 1668250762Smelifaro p = ((ipfw_insn_u32 *)cmd)->d; 1669250762Smelifaro 1670250762Smelifaro if (is_ipv4) 1671250762Smelifaro x = ip->ip_tos >> 2; 1672250762Smelifaro else if (is_ipv6) { 1673250762Smelifaro uint8_t *v; 1674250762Smelifaro v = &((struct ip6_hdr *)ip)->ip6_vfc; 1675250762Smelifaro x = (*v & 0x0F) << 2; 1676250762Smelifaro v++; 1677250762Smelifaro x |= *v >> 6; 1678250762Smelifaro } else 1679250762Smelifaro break; 1680250762Smelifaro 1681250762Smelifaro /* DSCP bitmask is stored as low_u32 high_u32 */ 1682250762Smelifaro if (x > 32) 1683250762Smelifaro match = *(p + 1) & (1 << (x - 32)); 1684250762Smelifaro else 1685250762Smelifaro match = *p & (1 << x); 1686250762Smelifaro } 1687250762Smelifaro break; 1688250762Smelifaro 1689136075Sgreen case O_TCPDATALEN: 1690136075Sgreen if (proto == IPPROTO_TCP && offset == 0) { 1691136075Sgreen struct tcphdr *tcp; 1692136075Sgreen uint16_t x; 1693136075Sgreen uint16_t *p; 1694136075Sgreen int i; 1695136075Sgreen 1696145093Sbrooks tcp = TCP(ulp); 1697201122Sluigi x = iplen - 1698136075Sgreen ((ip->ip_hl + tcp->th_off) << 2); 1699136075Sgreen if (cmdlen == 1) { 1700136075Sgreen match = (cmd->arg1 == x); 1701136075Sgreen break; 1702136075Sgreen } 1703136075Sgreen /* otherwise we have ranges */ 1704136075Sgreen p = ((ipfw_insn_u16 *)cmd)->ports; 1705136075Sgreen i = cmdlen - 1; 1706136075Sgreen for (; !match && i>0; i--, p += 2) 1707136075Sgreen match = (x >= p[0] && x <= p[1]); 1708136075Sgreen } 1709136075Sgreen break; 1710136075Sgreen 171198943Sluigi case O_TCPFLAGS: 171299622Sluigi match = (proto == IPPROTO_TCP && offset == 0 && 1713145093Sbrooks flags_match(cmd, TCP(ulp)->th_flags)); 171499622Sluigi break; 171598943Sluigi 171698943Sluigi case O_TCPOPTS: 1717220796Sglebius PULLUP_LEN(hlen, ulp, (TCP(ulp)->th_off << 2)); 171899622Sluigi match = (proto == IPPROTO_TCP && offset == 0 && 1719145093Sbrooks tcpopts_match(TCP(ulp), cmd)); 172099622Sluigi break; 172198943Sluigi 172298943Sluigi case O_TCPSEQ: 172399622Sluigi match = (proto == IPPROTO_TCP && offset == 0 && 172499622Sluigi ((ipfw_insn_u32 *)cmd)->d[0] == 1725145093Sbrooks TCP(ulp)->th_seq); 172699622Sluigi break; 172798943Sluigi 172898943Sluigi case O_TCPACK: 172999622Sluigi match = (proto == IPPROTO_TCP && offset == 0 && 173099622Sluigi ((ipfw_insn_u32 *)cmd)->d[0] == 1731145093Sbrooks TCP(ulp)->th_ack); 173299622Sluigi break; 173398943Sluigi 173498943Sluigi case O_TCPWIN: 1735234278Sglebius if (proto == IPPROTO_TCP && offset == 0) { 1736234278Sglebius uint16_t x; 1737234278Sglebius uint16_t *p; 1738234278Sglebius int i; 1739234278Sglebius 1740234278Sglebius x = ntohs(TCP(ulp)->th_win); 1741234278Sglebius if (cmdlen == 1) { 1742234278Sglebius match = (cmd->arg1 == x); 1743234278Sglebius break; 1744234278Sglebius } 1745234278Sglebius /* Otherwise we have ranges. */ 1746234278Sglebius p = ((ipfw_insn_u16 *)cmd)->ports; 1747234278Sglebius i = cmdlen - 1; 1748234278Sglebius for (; !match && i > 0; i--, p += 2) 1749234278Sglebius match = (x >= p[0] && x <= p[1]); 1750234278Sglebius } 175199622Sluigi break; 175298943Sluigi 175398943Sluigi case O_ESTAB: 175498943Sluigi /* reject packets which have SYN only */ 175599622Sluigi /* XXX should i also check for TH_ACK ? */ 175699622Sluigi match = (proto == IPPROTO_TCP && offset == 0 && 1757145093Sbrooks (TCP(ulp)->th_flags & 175899622Sluigi (TH_RST | TH_ACK | TH_SYN)) != TH_SYN); 175999622Sluigi break; 176098943Sluigi 1761136071Sgreen case O_ALTQ: { 1762171173Smlaier struct pf_mtag *at; 1763136071Sgreen ipfw_insn_altq *altq = (ipfw_insn_altq *)cmd; 1764136071Sgreen 1765136071Sgreen match = 1; 1766171173Smlaier at = pf_find_mtag(m); 1767171173Smlaier if (at != NULL && at->qid != 0) 1768146962Sgreen break; 1769171173Smlaier at = pf_get_mtag(m); 1770171173Smlaier if (at == NULL) { 1771136071Sgreen /* 1772136071Sgreen * Let the packet fall back to the 1773136071Sgreen * default ALTQ. 1774136071Sgreen */ 1775136071Sgreen break; 1776136071Sgreen } 1777136071Sgreen at->qid = altq->qid; 1778136071Sgreen at->hdr = ip; 1779136071Sgreen break; 1780136071Sgreen } 1781136071Sgreen 178298943Sluigi case O_LOG: 1783200654Sluigi ipfw_log(f, hlen, args, m, 1784225032Sbz oif, offset | ip6f_mf, tablearg, ip); 178599622Sluigi match = 1; 178699622Sluigi break; 178798943Sluigi 178899475Sluigi case O_PROB: 178999622Sluigi match = (random()<((ipfw_insn_u32 *)cmd)->d[0]); 179099622Sluigi break; 179198943Sluigi 1792112250Scjc case O_VERREVPATH: 1793112250Scjc /* Outgoing packets automatically pass/match */ 1794145246Sbrooks match = ((oif != NULL) || 1795116763Sluigi (m->m_pkthdr.rcvif == NULL) || 1796145266Sphk ( 1797145266Sphk#ifdef INET6 1798145266Sphk is_ipv6 ? 1799147418Smlaier verify_path6(&(args->f_id.src_ip6), 1800232292Sbz m->m_pkthdr.rcvif, args->f_id.fib) : 1801145266Sphk#endif 1802178888Sjulian verify_path(src_ip, m->m_pkthdr.rcvif, 1803178888Sjulian args->f_id.fib))); 1804112250Scjc break; 1805112250Scjc 1806128575Sandre case O_VERSRCREACH: 1807128575Sandre /* Outgoing packets automatically pass/match */ 1808133485Sandre match = (hlen > 0 && ((oif != NULL) || 1809147418Smlaier#ifdef INET6 1810147418Smlaier is_ipv6 ? 1811147418Smlaier verify_path6(&(args->f_id.src_ip6), 1812232292Sbz NULL, args->f_id.fib) : 1813147418Smlaier#endif 1814178888Sjulian verify_path(src_ip, NULL, args->f_id.fib))); 1815128575Sandre break; 1816128575Sandre 1817133387Sandre case O_ANTISPOOF: 1818133387Sandre /* Outgoing packets automatically pass/match */ 1819133387Sandre if (oif == NULL && hlen > 0 && 1820147418Smlaier ( (is_ipv4 && in_localaddr(src_ip)) 1821147418Smlaier#ifdef INET6 1822147418Smlaier || (is_ipv6 && 1823147418Smlaier in6_localaddr(&(args->f_id.src_ip6))) 1824147418Smlaier#endif 1825147418Smlaier )) 1826147418Smlaier match = 1827147418Smlaier#ifdef INET6 1828147418Smlaier is_ipv6 ? verify_path6( 1829147418Smlaier &(args->f_id.src_ip6), 1830232292Sbz m->m_pkthdr.rcvif, 1831232292Sbz args->f_id.fib) : 1832147418Smlaier#endif 1833147418Smlaier verify_path(src_ip, 1834178888Sjulian m->m_pkthdr.rcvif, 1835178888Sjulian args->f_id.fib); 1836133387Sandre else 1837133387Sandre match = 1; 1838133387Sandre break; 1839133387Sandre 1840117241Sluigi case O_IPSEC: 1841171167Sgnn#ifdef IPSEC 1842117241Sluigi match = (m_tag_find(m, 1843117241Sluigi PACKET_TAG_IPSEC_IN_DONE, NULL) != NULL); 1844117241Sluigi#endif 1845117241Sluigi /* otherwise no match */ 1846117241Sluigi break; 1847117241Sluigi 1848150122Sbz#ifdef INET6 1849145246Sbrooks case O_IP6_SRC: 1850145246Sbrooks match = is_ipv6 && 1851145246Sbrooks IN6_ARE_ADDR_EQUAL(&args->f_id.src_ip6, 1852145246Sbrooks &((ipfw_insn_ip6 *)cmd)->addr6); 1853145246Sbrooks break; 1854145246Sbrooks 1855145246Sbrooks case O_IP6_DST: 1856145246Sbrooks match = is_ipv6 && 1857145246Sbrooks IN6_ARE_ADDR_EQUAL(&args->f_id.dst_ip6, 1858145246Sbrooks &((ipfw_insn_ip6 *)cmd)->addr6); 1859145246Sbrooks break; 1860145246Sbrooks case O_IP6_SRC_MASK: 1861145246Sbrooks case O_IP6_DST_MASK: 1862145246Sbrooks if (is_ipv6) { 1863162351Sjhay int i = cmdlen - 1; 1864162351Sjhay struct in6_addr p; 1865162351Sjhay struct in6_addr *d = 1866162351Sjhay &((ipfw_insn_ip6 *)cmd)->addr6; 1867145246Sbrooks 1868162351Sjhay for (; !match && i > 0; d += 2, 1869162351Sjhay i -= F_INSN_SIZE(struct in6_addr) 1870162351Sjhay * 2) { 1871162351Sjhay p = (cmd->opcode == 1872162351Sjhay O_IP6_SRC_MASK) ? 1873162351Sjhay args->f_id.src_ip6: 1874162351Sjhay args->f_id.dst_ip6; 1875162351Sjhay APPLY_MASK(&p, &d[1]); 1876162351Sjhay match = 1877162351Sjhay IN6_ARE_ADDR_EQUAL(&d[0], 1878162351Sjhay &p); 1879162351Sjhay } 1880145246Sbrooks } 1881145246Sbrooks break; 1882145246Sbrooks 1883145246Sbrooks case O_FLOW6ID: 1884145246Sbrooks match = is_ipv6 && 1885145246Sbrooks flow6id_match(args->f_id.flow_id6, 1886145246Sbrooks (ipfw_insn_u32 *) cmd); 1887145246Sbrooks break; 1888145246Sbrooks 1889145246Sbrooks case O_EXT_HDR: 1890145246Sbrooks match = is_ipv6 && 1891145246Sbrooks (ext_hd & ((ipfw_insn *) cmd)->arg1); 1892145246Sbrooks break; 1893145246Sbrooks 1894145246Sbrooks case O_IP6: 1895145246Sbrooks match = is_ipv6; 1896145246Sbrooks break; 1897145266Sphk#endif 1898145246Sbrooks 1899146894Smlaier case O_IP4: 1900146894Smlaier match = is_ipv4; 1901146894Smlaier break; 1902146894Smlaier 1903159636Soleg case O_TAG: { 1904201527Sluigi struct m_tag *mtag; 1905250760Smelifaro uint32_t tag = IP_FW_ARG_TABLEARG(cmd->arg1); 1906159636Soleg 1907158879Soleg /* Packet is already tagged with this tag? */ 1908159636Soleg mtag = m_tag_locate(m, MTAG_IPFW, tag, NULL); 1909159636Soleg 1910158879Soleg /* We have `untag' action when F_NOT flag is 1911158879Soleg * present. And we must remove this mtag from 1912158879Soleg * mbuf and reset `match' to zero (`match' will 1913158879Soleg * be inversed later). 1914158879Soleg * Otherwise we should allocate new mtag and 1915158879Soleg * push it into mbuf. 1916158879Soleg */ 1917158879Soleg if (cmd->len & F_NOT) { /* `untag' action */ 1918158879Soleg if (mtag != NULL) 1919158879Soleg m_tag_delete(m, mtag); 1920201527Sluigi match = 0; 1921220568Sae } else { 1922220568Sae if (mtag == NULL) { 1923220568Sae mtag = m_tag_alloc( MTAG_IPFW, 1924220568Sae tag, 0, M_NOWAIT); 1925220568Sae if (mtag != NULL) 1926220568Sae m_tag_prepend(m, mtag); 1927220568Sae } 1928201527Sluigi match = 1; 1929158879Soleg } 1930158879Soleg break; 1931159636Soleg } 1932158879Soleg 1933178888Sjulian case O_FIB: /* try match the specified fib */ 1934178888Sjulian if (args->f_id.fib == cmd->arg1) 1935178888Sjulian match = 1; 1936178888Sjulian break; 1937178888Sjulian 1938215179Sluigi case O_SOCKARG: { 1939215179Sluigi struct inpcb *inp = args->inp; 1940215179Sluigi struct inpcbinfo *pi; 1941215179Sluigi 1942215179Sluigi if (is_ipv6) /* XXX can we remove this ? */ 1943215179Sluigi break; 1944215179Sluigi 1945215179Sluigi if (proto == IPPROTO_TCP) 1946215179Sluigi pi = &V_tcbinfo; 1947215179Sluigi else if (proto == IPPROTO_UDP) 1948215179Sluigi pi = &V_udbinfo; 1949215179Sluigi else 1950215179Sluigi break; 1951215179Sluigi 1952222488Srwatson /* 1953222488Srwatson * XXXRW: so_user_cookie should almost 1954222488Srwatson * certainly be inp_user_cookie? 1955222488Srwatson */ 1956222488Srwatson 1957215179Sluigi /* For incomming packet, lookup up the 1958215179Sluigi inpcb using the src/dest ip/port tuple */ 1959215179Sluigi if (inp == NULL) { 1960222488Srwatson inp = in_pcblookup(pi, 1961215179Sluigi src_ip, htons(src_port), 1962215179Sluigi dst_ip, htons(dst_port), 1963222488Srwatson INPLOOKUP_RLOCKPCB, NULL); 1964222488Srwatson if (inp != NULL) { 1965222488Srwatson tablearg = 1966222488Srwatson inp->inp_socket->so_user_cookie; 1967222488Srwatson if (tablearg) 1968222488Srwatson match = 1; 1969222488Srwatson INP_RUNLOCK(inp); 1970222488Srwatson } 1971222488Srwatson } else { 1972222488Srwatson if (inp->inp_socket) { 1973222488Srwatson tablearg = 1974222488Srwatson inp->inp_socket->so_user_cookie; 1975222488Srwatson if (tablearg) 1976222488Srwatson match = 1; 1977222488Srwatson } 1978215179Sluigi } 1979215179Sluigi break; 1980215179Sluigi } 1981215179Sluigi 1982159636Soleg case O_TAGGED: { 1983201527Sluigi struct m_tag *mtag; 1984250760Smelifaro uint32_t tag = IP_FW_ARG_TABLEARG(cmd->arg1); 1985159636Soleg 1986158879Soleg if (cmdlen == 1) { 1987159636Soleg match = m_tag_locate(m, MTAG_IPFW, 1988159636Soleg tag, NULL) != NULL; 1989158879Soleg break; 1990158879Soleg } 1991158879Soleg 1992158879Soleg /* we have ranges */ 1993158879Soleg for (mtag = m_tag_first(m); 1994158879Soleg mtag != NULL && !match; 1995158879Soleg mtag = m_tag_next(m, mtag)) { 1996158879Soleg uint16_t *p; 1997158879Soleg int i; 1998158879Soleg 1999158879Soleg if (mtag->m_tag_cookie != MTAG_IPFW) 2000158879Soleg continue; 2001158879Soleg 2002158879Soleg p = ((ipfw_insn_u16 *)cmd)->ports; 2003158879Soleg i = cmdlen - 1; 2004158879Soleg for(; !match && i > 0; i--, p += 2) 2005158879Soleg match = 2006158879Soleg mtag->m_tag_id >= p[0] && 2007158879Soleg mtag->m_tag_id <= p[1]; 2008158879Soleg } 2009158879Soleg break; 2010159636Soleg } 2011158879Soleg 201299622Sluigi /* 201399622Sluigi * The second set of opcodes represents 'actions', 201499622Sluigi * i.e. the terminal part of a rule once the packet 201599622Sluigi * matches all previous patterns. 201699622Sluigi * Typically there is only one action for each rule, 201799622Sluigi * and the opcode is stored at the end of the rule 201899622Sluigi * (but there are exceptions -- see below). 201999622Sluigi * 202099622Sluigi * In general, here we set retval and terminate the 202199622Sluigi * outer loop (would be a 'break 3' in some language, 2022200059Sluigi * but we need to set l=0, done=1) 202399622Sluigi * 202499622Sluigi * Exceptions: 202599622Sluigi * O_COUNT and O_SKIPTO actions: 202699622Sluigi * instead of terminating, we jump to the next rule 2027200855Sluigi * (setting l=0), or to the SKIPTO target (setting 2028200855Sluigi * f/f_len, cmd and l as needed), respectively. 202999622Sluigi * 2030158879Soleg * O_TAG, O_LOG and O_ALTQ action parameters: 2031136071Sgreen * perform some action and set match = 1; 2032136071Sgreen * 203399622Sluigi * O_LIMIT and O_KEEP_STATE: these opcodes are 203499622Sluigi * not real 'actions', and are stored right 203599622Sluigi * before the 'action' part of the rule. 203699622Sluigi * These opcodes try to install an entry in the 203799622Sluigi * state tables; if successful, we continue with 203899622Sluigi * the next opcode (match=1; break;), otherwise 2039200059Sluigi * the packet must be dropped (set retval, 2040200059Sluigi * break loops with l=0, done=1) 204199622Sluigi * 204299622Sluigi * O_PROBE_STATE and O_CHECK_STATE: these opcodes 204399622Sluigi * cause a lookup of the state table, and a jump 204499622Sluigi * to the 'action' part of the parent rule 2045200059Sluigi * if an entry is found, or 204699622Sluigi * (CHECK_STATE only) a jump to the next rule if 2047200059Sluigi * the entry is not found. 2048200059Sluigi * The result of the lookup is cached so that 2049200059Sluigi * further instances of these opcodes become NOPs. 2050200059Sluigi * The jump to the next rule is done by setting 2051200059Sluigi * l=0, cmdlen=0. 205299622Sluigi */ 205398943Sluigi case O_LIMIT: 205498943Sluigi case O_KEEP_STATE: 2055200601Sluigi if (ipfw_install_state(f, 2056159636Soleg (ipfw_insn_limit *)cmd, args, tablearg)) { 2057200059Sluigi /* error or limit violation */ 2058140224Sglebius retval = IP_FW_DENY; 2059200059Sluigi l = 0; /* exit inner loop */ 2060200059Sluigi done = 1; /* exit outer loop */ 206199622Sluigi } 206299622Sluigi match = 1; 206399622Sluigi break; 206498943Sluigi 206598943Sluigi case O_PROBE_STATE: 206698943Sluigi case O_CHECK_STATE: 206798943Sluigi /* 206898943Sluigi * dynamic rules are checked at the first 206999622Sluigi * keep-state or check-state occurrence, 207099622Sluigi * with the result being stored in dyn_dir. 207199622Sluigi * The compiler introduces a PROBE_STATE 207298943Sluigi * instruction for us when we have a 207399622Sluigi * KEEP_STATE (because PROBE_STATE needs 207498943Sluigi * to be run first). 207598943Sluigi */ 207699622Sluigi if (dyn_dir == MATCH_UNKNOWN && 2077200601Sluigi (q = ipfw_lookup_dyn_rule(&args->f_id, 2078100004Sluigi &dyn_dir, proto == IPPROTO_TCP ? 2079145093Sbrooks TCP(ulp) : NULL)) 2080100004Sluigi != NULL) { 208199622Sluigi /* 208299622Sluigi * Found dynamic entry, update stats 208399622Sluigi * and jump to the 'action' part of 2084200059Sluigi * the parent rule by setting 2085200059Sluigi * f, cmd, l and clearing cmdlen. 208699622Sluigi */ 2087250761Smelifaro IPFW_INC_DYN_COUNTER(q, pktlen); 2088200855Sluigi /* XXX we would like to have f_pos 2089200855Sluigi * readily accessible in the dynamic 2090200855Sluigi * rule, instead of having to 2091200855Sluigi * lookup q->rule. 2092200855Sluigi */ 209399622Sluigi f = q->rule; 2094200855Sluigi f_pos = ipfw_find_rule(chain, 2095200855Sluigi f->rulenum, f->id); 209699622Sluigi cmd = ACTION_PTR(f); 209799622Sluigi l = f->cmd_len - f->act_ofs; 2098244571Smelifaro ipfw_dyn_unlock(q); 2099200059Sluigi cmdlen = 0; 2100200059Sluigi match = 1; 2101200059Sluigi break; 210298943Sluigi } 210399622Sluigi /* 210499622Sluigi * Dynamic entry not found. If CHECK_STATE, 210599622Sluigi * skip to next rule, if PROBE_STATE just 210699622Sluigi * ignore and continue with next opcode. 210799622Sluigi */ 210898943Sluigi if (cmd->opcode == O_CHECK_STATE) 2109200059Sluigi l = 0; /* exit inner loop */ 211099622Sluigi match = 1; 211199622Sluigi break; 211298943Sluigi 211398943Sluigi case O_ACCEPT: 211498943Sluigi retval = 0; /* accept */ 2115200059Sluigi l = 0; /* exit inner loop */ 2116200059Sluigi done = 1; /* exit outer loop */ 2117200059Sluigi break; 211898943Sluigi 211998943Sluigi case O_PIPE: 212098943Sluigi case O_QUEUE: 2121200855Sluigi set_match(args, f_pos, chain); 2122250760Smelifaro args->rule.info = IP_FW_ARG_TABLEARG(cmd->arg1); 2123201527Sluigi if (cmd->opcode == O_PIPE) 2124201527Sluigi args->rule.info |= IPFW_IS_PIPE; 2125201527Sluigi if (V_fw_one_pass) 2126201527Sluigi args->rule.info |= IPFW_ONEPASS; 2127140224Sglebius retval = IP_FW_DUMMYNET; 2128200059Sluigi l = 0; /* exit inner loop */ 2129200059Sluigi done = 1; /* exit outer loop */ 2130200059Sluigi break; 2131105775Smaxim 213298943Sluigi case O_DIVERT: 2133200059Sluigi case O_TEE: 213498943Sluigi if (args->eh) /* not on layer 2 */ 2135200059Sluigi break; 2136200059Sluigi /* otherwise this is terminal */ 2137200059Sluigi l = 0; /* exit inner loop */ 2138200059Sluigi done = 1; /* exit outer loop */ 2139201527Sluigi retval = (cmd->opcode == O_DIVERT) ? 2140200059Sluigi IP_FW_DIVERT : IP_FW_TEE; 2141201527Sluigi set_match(args, f_pos, chain); 2142250760Smelifaro args->rule.info = IP_FW_ARG_TABLEARG(cmd->arg1); 2143200059Sluigi break; 2144200059Sluigi 214598943Sluigi case O_COUNT: 2146250761Smelifaro IPFW_INC_RULE_COUNTER(f, pktlen); 2147200896Sluigi l = 0; /* exit inner loop */ 2148200896Sluigi break; 2149200855Sluigi 2150200855Sluigi case O_SKIPTO: 2151250761Smelifaro IPFW_INC_RULE_COUNTER(f, pktlen); 2152250760Smelifaro f_pos = jump_fast(chain, f, cmd->arg1, tablearg, 0); 2153200896Sluigi /* 2154200855Sluigi * Skip disabled rules, and re-enter 2155200855Sluigi * the inner loop with the correct 2156200855Sluigi * f_pos, f, l and cmd. 2157200896Sluigi * Also clear cmdlen and skip_or 2158200896Sluigi */ 2159200855Sluigi for (; f_pos < chain->n_rules - 1 && 2160200855Sluigi (V_set_disable & 2161200855Sluigi (1 << chain->map[f_pos]->set)); 2162200855Sluigi f_pos++) 2163200855Sluigi ; 2164209589Sglebius /* Re-enter the inner loop at the skipto rule. */ 2165200855Sluigi f = chain->map[f_pos]; 2166200896Sluigi l = f->cmd_len; 2167200896Sluigi cmd = f->cmd; 2168200896Sluigi match = 1; 2169200896Sluigi cmdlen = 0; 2170200896Sluigi skip_or = 0; 2171209589Sglebius continue; 2172209589Sglebius break; /* not reached */ 217398943Sluigi 2174223666Sae case O_CALLRETURN: { 2175223666Sae /* 2176223666Sae * Implementation of `subroutine' call/return, 2177223666Sae * in the stack carried in an mbuf tag. This 2178223666Sae * is different from `skipto' in that any call 2179223666Sae * address is possible (`skipto' must prevent 2180223666Sae * backward jumps to avoid endless loops). 2181223666Sae * We have `return' action when F_NOT flag is 2182223666Sae * present. The `m_tag_id' field is used as 2183223666Sae * stack pointer. 2184223666Sae */ 2185223666Sae struct m_tag *mtag; 2186223666Sae uint16_t jmpto, *stack; 2187223666Sae 2188223666Sae#define IS_CALL ((cmd->len & F_NOT) == 0) 2189223666Sae#define IS_RETURN ((cmd->len & F_NOT) != 0) 2190223666Sae /* 2191223666Sae * Hand-rolled version of m_tag_locate() with 2192223666Sae * wildcard `type'. 2193223666Sae * If not already tagged, allocate new tag. 2194223666Sae */ 2195223666Sae mtag = m_tag_first(m); 2196223666Sae while (mtag != NULL) { 2197223666Sae if (mtag->m_tag_cookie == 2198223666Sae MTAG_IPFW_CALL) 2199223666Sae break; 2200223666Sae mtag = m_tag_next(m, mtag); 2201223666Sae } 2202223666Sae if (mtag == NULL && IS_CALL) { 2203223666Sae mtag = m_tag_alloc(MTAG_IPFW_CALL, 0, 2204223666Sae IPFW_CALLSTACK_SIZE * 2205223666Sae sizeof(uint16_t), M_NOWAIT); 2206223666Sae if (mtag != NULL) 2207223666Sae m_tag_prepend(m, mtag); 2208223666Sae } 2209223666Sae 2210223666Sae /* 2211223666Sae * On error both `call' and `return' just 2212223666Sae * continue with next rule. 2213223666Sae */ 2214223666Sae if (IS_RETURN && (mtag == NULL || 2215223666Sae mtag->m_tag_id == 0)) { 2216223666Sae l = 0; /* exit inner loop */ 2217223666Sae break; 2218223666Sae } 2219223666Sae if (IS_CALL && (mtag == NULL || 2220223666Sae mtag->m_tag_id >= IPFW_CALLSTACK_SIZE)) { 2221223666Sae printf("ipfw: call stack error, " 2222223666Sae "go to next rule\n"); 2223223666Sae l = 0; /* exit inner loop */ 2224223666Sae break; 2225223666Sae } 2226223666Sae 2227250761Smelifaro IPFW_INC_RULE_COUNTER(f, pktlen); 2228223666Sae stack = (uint16_t *)(mtag + 1); 2229223666Sae 2230223666Sae /* 2231223666Sae * The `call' action may use cached f_pos 2232223666Sae * (in f->next_rule), whose version is written 2233223666Sae * in f->next_rule. 2234223666Sae * The `return' action, however, doesn't have 2235223666Sae * fixed jump address in cmd->arg1 and can't use 2236223666Sae * cache. 2237223666Sae */ 2238223666Sae if (IS_CALL) { 2239223666Sae stack[mtag->m_tag_id] = f->rulenum; 2240223666Sae mtag->m_tag_id++; 2241250760Smelifaro f_pos = jump_fast(chain, f, cmd->arg1, 2242250760Smelifaro tablearg, 1); 2243223666Sae } else { /* `return' action */ 2244223666Sae mtag->m_tag_id--; 2245223666Sae jmpto = stack[mtag->m_tag_id] + 1; 2246223666Sae f_pos = ipfw_find_rule(chain, jmpto, 0); 2247223666Sae } 2248223666Sae 2249223666Sae /* 2250223666Sae * Skip disabled rules, and re-enter 2251223666Sae * the inner loop with the correct 2252223666Sae * f_pos, f, l and cmd. 2253223666Sae * Also clear cmdlen and skip_or 2254223666Sae */ 2255223666Sae for (; f_pos < chain->n_rules - 1 && 2256223666Sae (V_set_disable & 2257223666Sae (1 << chain->map[f_pos]->set)); f_pos++) 2258223666Sae ; 2259223666Sae /* Re-enter the inner loop at the dest rule. */ 2260223666Sae f = chain->map[f_pos]; 2261223666Sae l = f->cmd_len; 2262223666Sae cmd = f->cmd; 2263223666Sae cmdlen = 0; 2264223666Sae skip_or = 0; 2265223666Sae continue; 2266223666Sae break; /* NOTREACHED */ 2267223666Sae } 2268223666Sae#undef IS_CALL 2269223666Sae#undef IS_RETURN 2270223666Sae 227198943Sluigi case O_REJECT: 227298943Sluigi /* 227398943Sluigi * Drop the packet and send a reject notice 227498943Sluigi * if the packet is not ICMP (or is an ICMP 227598943Sluigi * query), and it is not multicast/broadcast. 227698943Sluigi */ 2277154216Scperciva if (hlen > 0 && is_ipv4 && offset == 0 && 227898943Sluigi (proto != IPPROTO_ICMP || 2279145093Sbrooks is_icmp_query(ICMP(ulp))) && 228098943Sluigi !(m->m_flags & (M_BCAST|M_MCAST)) && 2281123572Smaxim !IN_MULTICAST(ntohl(dst_ip.s_addr))) { 2282201122Sluigi send_reject(args, cmd->arg1, iplen, ip); 228399475Sluigi m = args->m; 228498943Sluigi } 228599622Sluigi /* FALLTHROUGH */ 2286149020Sbz#ifdef INET6 2287149020Sbz case O_UNREACH6: 2288149020Sbz if (hlen > 0 && is_ipv6 && 2289160025Sbz ((offset & IP6F_OFF_MASK) == 0) && 2290149020Sbz (proto != IPPROTO_ICMPV6 || 2291205173Sluigi (is_icmp6_query(icmp6_type) == 1)) && 2292149020Sbz !(m->m_flags & (M_BCAST|M_MCAST)) && 2293149020Sbz !IN6_IS_ADDR_MULTICAST(&args->f_id.dst_ip6)) { 2294165738Sjulian send_reject6( 2295165738Sjulian args, cmd->arg1, hlen, 2296165738Sjulian (struct ip6_hdr *)ip); 2297149020Sbz m = args->m; 2298149020Sbz } 2299149020Sbz /* FALLTHROUGH */ 2300149020Sbz#endif 230199622Sluigi case O_DENY: 2302140224Sglebius retval = IP_FW_DENY; 2303200059Sluigi l = 0; /* exit inner loop */ 2304200059Sluigi done = 1; /* exit outer loop */ 2305200059Sluigi break; 230698943Sluigi 2307200059Sluigi case O_FORWARD_IP: 230898943Sluigi if (args->eh) /* not valid on layer2 pkts */ 230999622Sluigi break; 2310222582Sae if (q == NULL || q->rule != f || 2311222582Sae dyn_dir == MATCH_FORWARD) { 2312200059Sluigi struct sockaddr_in *sa; 2313200059Sluigi sa = &(((ipfw_insn_sa *)cmd)->sa); 2314200059Sluigi if (sa->sin_addr.s_addr == INADDR_ANY) { 2315200059Sluigi bcopy(sa, &args->hopstore, 2316161424Sjulian sizeof(*sa)); 2317200059Sluigi args->hopstore.sin_addr.s_addr = 2318161456Sjulian htonl(tablearg); 2319200059Sluigi args->next_hop = &args->hopstore; 2320200059Sluigi } else { 2321200059Sluigi args->next_hop = sa; 2322200059Sluigi } 2323161424Sjulian } 2324140224Sglebius retval = IP_FW_PASS; 2325200059Sluigi l = 0; /* exit inner loop */ 2326200059Sluigi done = 1; /* exit outer loop */ 2327200059Sluigi break; 232898943Sluigi 2329225044Sbz#ifdef INET6 2330225044Sbz case O_FORWARD_IP6: 2331225044Sbz if (args->eh) /* not valid on layer2 pkts */ 2332225044Sbz break; 2333225044Sbz if (q == NULL || q->rule != f || 2334225044Sbz dyn_dir == MATCH_FORWARD) { 2335225044Sbz struct sockaddr_in6 *sin6; 2336225044Sbz 2337225044Sbz sin6 = &(((ipfw_insn_sa6 *)cmd)->sa); 2338225044Sbz args->next_hop6 = sin6; 2339225044Sbz } 2340225044Sbz retval = IP_FW_PASS; 2341225044Sbz l = 0; /* exit inner loop */ 2342225044Sbz done = 1; /* exit outer loop */ 2343225044Sbz break; 2344225044Sbz#endif 2345225044Sbz 2346141351Sglebius case O_NETGRAPH: 2347141351Sglebius case O_NGTEE: 2348200855Sluigi set_match(args, f_pos, chain); 2349250760Smelifaro args->rule.info = IP_FW_ARG_TABLEARG(cmd->arg1); 2350210537Sglebius if (V_fw_one_pass) 2351210537Sglebius args->rule.info |= IPFW_ONEPASS; 2352141351Sglebius retval = (cmd->opcode == O_NETGRAPH) ? 2353141351Sglebius IP_FW_NETGRAPH : IP_FW_NGTEE; 2354200059Sluigi l = 0; /* exit inner loop */ 2355200059Sluigi done = 1; /* exit outer loop */ 2356200059Sluigi break; 2357141351Sglebius 2358222473Sae case O_SETFIB: { 2359222473Sae uint32_t fib; 2360222473Sae 2361250761Smelifaro IPFW_INC_RULE_COUNTER(f, pktlen); 2362250760Smelifaro fib = IP_FW_ARG_TABLEARG(cmd->arg1); 2363222473Sae if (fib >= rt_numfibs) 2364222473Sae fib = 0; 2365222473Sae M_SETFIB(m, fib); 2366222473Sae args->f_id.fib = fib; 2367200059Sluigi l = 0; /* exit inner loop */ 2368200059Sluigi break; 2369222473Sae } 2370178888Sjulian 2371250762Smelifaro case O_SETDSCP: { 2372250762Smelifaro uint16_t code; 2373250762Smelifaro 2374250762Smelifaro code = IP_FW_ARG_TABLEARG(cmd->arg1) & 0x3F; 2375250762Smelifaro l = 0; /* exit inner loop */ 2376250762Smelifaro if (is_ipv4) { 2377250762Smelifaro uint16_t a; 2378250762Smelifaro 2379250762Smelifaro a = ip->ip_tos; 2380250762Smelifaro ip->ip_tos = (code << 2) | (ip->ip_tos & 0x03); 2381250762Smelifaro a += ntohs(ip->ip_sum) - ip->ip_tos; 2382250762Smelifaro ip->ip_sum = htons(a); 2383250762Smelifaro } else if (is_ipv6) { 2384250762Smelifaro uint8_t *v; 2385250762Smelifaro 2386250762Smelifaro v = &((struct ip6_hdr *)ip)->ip6_vfc; 2387250762Smelifaro *v = (*v & 0xF0) | (code >> 2); 2388250762Smelifaro v++; 2389250762Smelifaro *v = (*v & 0x3F) | ((code & 0x03) << 6); 2390250762Smelifaro } else 2391250762Smelifaro break; 2392250762Smelifaro 2393250762Smelifaro IPFW_INC_RULE_COUNTER(f, pktlen); 2394250762Smelifaro break; 2395250762Smelifaro } 2396250762Smelifaro 2397200059Sluigi case O_NAT: 2398265699Smelifaro l = 0; /* exit inner loop */ 2399265699Smelifaro done = 1; /* exit outer loop */ 2400200059Sluigi if (!IPFW_NAT_LOADED) { 2401200059Sluigi retval = IP_FW_DENY; 2402265699Smelifaro break; 2403265699Smelifaro } 2404176669Spiso 2405265699Smelifaro struct cfg_nat *t; 2406265699Smelifaro int nat_id; 2407265699Smelifaro 2408265699Smelifaro set_match(args, f_pos, chain); 2409265699Smelifaro /* Check if this is 'global' nat rule */ 2410265699Smelifaro if (cmd->arg1 == 0) { 2411265699Smelifaro retval = ipfw_nat_ptr(args, NULL, m); 2412265699Smelifaro break; 2413265699Smelifaro } 2414265699Smelifaro t = ((ipfw_insn_nat *)cmd)->nat; 2415265699Smelifaro if (t == NULL) { 2416250760Smelifaro nat_id = IP_FW_ARG_TABLEARG(cmd->arg1); 2417200838Sluigi t = (*lookup_nat_ptr)(&chain->nat, nat_id); 2418200580Sluigi 2419165648Spiso if (t == NULL) { 2420200059Sluigi retval = IP_FW_DENY; 2421200059Sluigi break; 2422176669Spiso } 2423200059Sluigi if (cmd->arg1 != IP_FW_TABLEARG) 2424200059Sluigi ((ipfw_insn_nat *)cmd)->nat = t; 2425200059Sluigi } 2426265699Smelifaro retval = ipfw_nat_ptr(args, t, m); 2427200059Sluigi break; 2428165648Spiso 2429190633Spiso case O_REASS: { 2430190633Spiso int ip_off; 2431190633Spiso 2432250761Smelifaro IPFW_INC_RULE_COUNTER(f, pktlen); 2433200059Sluigi l = 0; /* in any case exit inner loop */ 2434201122Sluigi ip_off = ntohs(ip->ip_off); 2435201122Sluigi 2436200059Sluigi /* if not fragmented, go to next rule */ 2437200059Sluigi if ((ip_off & (IP_MF | IP_OFFMASK)) == 0) 2438200059Sluigi break; 2439200059Sluigi /* 2440200059Sluigi * ip_reass() expects len & off in host 2441201527Sluigi * byte order. 2442200059Sluigi */ 2443201527Sluigi SET_HOST_IPLEN(ip); 2444200059Sluigi 2445200059Sluigi args->m = m = ip_reass(m); 2446200059Sluigi 2447200059Sluigi /* 2448201527Sluigi * do IP header checksum fixup. 2449200059Sluigi */ 2450200059Sluigi if (m == NULL) { /* fragment got swallowed */ 2451200059Sluigi retval = IP_FW_DENY; 2452200059Sluigi } else { /* good, packet complete */ 2453200059Sluigi int hlen; 2454200059Sluigi 2455200059Sluigi ip = mtod(m, struct ip *); 2456200059Sluigi hlen = ip->ip_hl << 2; 2457201527Sluigi SET_NET_IPLEN(ip); 2458200059Sluigi ip->ip_sum = 0; 2459200059Sluigi if (hlen == sizeof(struct ip)) 2460200059Sluigi ip->ip_sum = in_cksum_hdr(ip); 2461200059Sluigi else 2462200059Sluigi ip->ip_sum = in_cksum(m, hlen); 2463200059Sluigi retval = IP_FW_REASS; 2464200855Sluigi set_match(args, f_pos, chain); 2465200059Sluigi } 2466200059Sluigi done = 1; /* exit outer loop */ 2467200059Sluigi break; 2468190633Spiso } 2469190633Spiso 247098943Sluigi default: 247198943Sluigi panic("-- unknown opcode %d\n", cmd->opcode); 247299622Sluigi } /* end of switch() on opcodes */ 2473200059Sluigi /* 2474200059Sluigi * if we get here with l=0, then match is irrelevant. 2475200059Sluigi */ 247698943Sluigi 247799622Sluigi if (cmd->len & F_NOT) 247899622Sluigi match = !match; 247998943Sluigi 248099622Sluigi if (match) { 248199622Sluigi if (cmd->len & F_OR) 248299622Sluigi skip_or = 1; 248399622Sluigi } else { 248499622Sluigi if (!(cmd->len & F_OR)) /* not an OR block, */ 248599622Sluigi break; /* try next rule */ 248698943Sluigi } 248798943Sluigi 2488200059Sluigi } /* end of inner loop, scan opcodes */ 2489220796Sglebius#undef PULLUP_LEN 249098943Sluigi 2491200059Sluigi if (done) 2492200059Sluigi break; 2493105775Smaxim 2494200059Sluigi/* next_rule:; */ /* try next rule */ 2495200059Sluigi 249698943Sluigi } /* end of outer for, scan rules */ 249798943Sluigi 2498200059Sluigi if (done) { 2499200855Sluigi struct ip_fw *rule = chain->map[f_pos]; 2500200059Sluigi /* Update statistics */ 2501250761Smelifaro IPFW_INC_RULE_COUNTER(rule, pktlen); 2502200059Sluigi } else { 2503200059Sluigi retval = IP_FW_DENY; 2504200059Sluigi printf("ipfw: ouch!, skip past end of rules, denying packet\n"); 2505200059Sluigi } 2506138642Scsjp IPFW_RUNLOCK(chain); 2507204591Sluigi#ifdef __FreeBSD__ 2508194498Sbrooks if (ucred_cache != NULL) 2509194498Sbrooks crfree(ucred_cache); 2510204591Sluigi#endif 2511140224Sglebius return (retval); 251298943Sluigi 251398943Sluigipullup_failed: 2514181803Sbz if (V_fw_verbose) 2515108258Smaxim printf("ipfw: pullup failed\n"); 2516140224Sglebius return (IP_FW_DENY); 251798943Sluigi} 251898943Sluigi 2519200601Sluigi/* 2520234597Smelifaro * Set maximum number of tables that can be used in given VNET ipfw instance. 2521234597Smelifaro */ 2522234597Smelifaro#ifdef SYSCTL_NODE 2523234597Smelifarostatic int 2524234597Smelifarosysctl_ipfw_table_num(SYSCTL_HANDLER_ARGS) 2525234597Smelifaro{ 2526234597Smelifaro int error; 2527234597Smelifaro unsigned int ntables; 2528234597Smelifaro 2529234597Smelifaro ntables = V_fw_tables_max; 2530234597Smelifaro 2531234597Smelifaro error = sysctl_handle_int(oidp, &ntables, 0, req); 2532234597Smelifaro /* Read operation or some error */ 2533234597Smelifaro if ((error != 0) || (req->newptr == NULL)) 2534234597Smelifaro return (error); 2535234597Smelifaro 2536234597Smelifaro return (ipfw_resize_tables(&V_layer3_chain, ntables)); 2537234597Smelifaro} 2538234597Smelifaro#endif 2539234597Smelifaro/* 2540200601Sluigi * Module and VNET glue 2541200601Sluigi */ 2542200601Sluigi 2543200601Sluigi/* 2544195862Sjulian * Stuff that must be initialised only on boot or module load 2545195862Sjulian */ 2546196423Sjulianstatic int 254798943Sluigiipfw_init(void) 254898943Sluigi{ 2549195862Sjulian int error = 0; 2550195862Sjulian 2551195862Sjulian /* 2552195862Sjulian * Only print out this stuff the first time around, 2553195862Sjulian * when called from the sysinit code. 2554195862Sjulian */ 2555195862Sjulian printf("ipfw2 " 2556195862Sjulian#ifdef INET6 2557195862Sjulian "(+ipv6) " 2558195862Sjulian#endif 2559195862Sjulian "initialized, divert %s, nat %s, " 2560195862Sjulian "default to %s, logging ", 2561195862Sjulian#ifdef IPDIVERT 2562195862Sjulian "enabled", 2563195862Sjulian#else 2564195862Sjulian "loadable", 2565195862Sjulian#endif 2566195862Sjulian#ifdef IPFIREWALL_NAT 2567195862Sjulian "enabled", 2568195862Sjulian#else 2569195862Sjulian "loadable", 2570195862Sjulian#endif 2571195862Sjulian default_to_accept ? "accept" : "deny"); 2572195862Sjulian 2573195862Sjulian /* 2574196423Sjulian * Note: V_xxx variables can be accessed here but the vnet specific 2575196423Sjulian * initializer may not have been called yet for the VIMAGE case. 2576196423Sjulian * Tuneables will have been processed. We will print out values for 2577196423Sjulian * the default vnet. 2578196423Sjulian * XXX This should all be rationalized AFTER 8.0 2579195862Sjulian */ 2580195862Sjulian if (V_fw_verbose == 0) 2581195862Sjulian printf("disabled\n"); 2582195862Sjulian else if (V_verbose_limit == 0) 2583195862Sjulian printf("unlimited\n"); 2584195862Sjulian else 2585195862Sjulian printf("limited to %d packets/entry by default\n", 2586195862Sjulian V_verbose_limit); 2587195862Sjulian 2588234597Smelifaro /* Check user-supplied table count for validness */ 2589234597Smelifaro if (default_fw_tables > IPFW_TABLES_MAX) 2590234597Smelifaro default_fw_tables = IPFW_TABLES_MAX; 2591234597Smelifaro 2592200654Sluigi ipfw_log_bpf(1); /* init */ 2593195862Sjulian return (error); 2594195862Sjulian} 2595195862Sjulian 2596200601Sluigi/* 2597197952Sjulian * Called for the removal of the last instance only on module unload. 2598197952Sjulian */ 2599197952Sjulianstatic void 2600197952Sjulianipfw_destroy(void) 2601197952Sjulian{ 2602197952Sjulian 2603200654Sluigi ipfw_log_bpf(0); /* uninit */ 2604197952Sjulian printf("IP firewall unloaded\n"); 2605197952Sjulian} 2606197952Sjulian 2607200601Sluigi/* 2608196423Sjulian * Stuff that must be initialized for every instance 2609196423Sjulian * (including the first of course). 2610195862Sjulian */ 2611195862Sjulianstatic int 2612195862Sjulianvnet_ipfw_init(const void *unused) 2613195862Sjulian{ 2614195862Sjulian int error; 2615200855Sluigi struct ip_fw *rule = NULL; 2616200838Sluigi struct ip_fw_chain *chain; 261798943Sluigi 2618200838Sluigi chain = &V_layer3_chain; 2619200838Sluigi 2620195862Sjulian /* First set up some values that are compile time options */ 2621200838Sluigi V_autoinc_step = 100; /* bounded to 1..1000 in add_rule() */ 2622200838Sluigi V_fw_deny_unknown_exthdrs = 1; 2623195862Sjulian#ifdef IPFIREWALL_VERBOSE 2624195862Sjulian V_fw_verbose = 1; 2625195862Sjulian#endif 2626195862Sjulian#ifdef IPFIREWALL_VERBOSE_LIMIT 2627195862Sjulian V_verbose_limit = IPFIREWALL_VERBOSE_LIMIT; 2628195862Sjulian#endif 2629200855Sluigi#ifdef IPFIREWALL_NAT 2630200855Sluigi LIST_INIT(&chain->nat); 2631200855Sluigi#endif 2632195862Sjulian 2633200855Sluigi /* insert the default rule and create the initial map */ 2634200855Sluigi chain->n_rules = 1; 2635200855Sluigi chain->static_len = sizeof(struct ip_fw); 2636234597Smelifaro chain->map = malloc(sizeof(struct ip_fw *), M_IPFW, M_WAITOK | M_ZERO); 2637200855Sluigi if (chain->map) 2638234597Smelifaro rule = malloc(chain->static_len, M_IPFW, M_WAITOK | M_ZERO); 2639234597Smelifaro 2640234597Smelifaro /* Set initial number of tables */ 2641234597Smelifaro V_fw_tables_max = default_fw_tables; 2642200838Sluigi error = ipfw_init_tables(chain); 2643195862Sjulian if (error) { 2644234597Smelifaro printf("ipfw2: setting up tables failed\n"); 2645234597Smelifaro free(chain->map, M_IPFW); 2646234597Smelifaro free(rule, M_IPFW); 2647234597Smelifaro return (ENOSPC); 2648195862Sjulian } 2649195862Sjulian 2650200855Sluigi /* fill and insert the default rule */ 2651200855Sluigi rule->act_ofs = 0; 2652200855Sluigi rule->rulenum = IPFW_DEFAULT_RULE; 2653200855Sluigi rule->cmd_len = 1; 2654200855Sluigi rule->set = RESVD_SET; 2655200855Sluigi rule->cmd[0].len = 1; 2656200855Sluigi rule->cmd[0].opcode = default_to_accept ? O_ACCEPT : O_DENY; 2657265699Smelifaro chain->default_rule = chain->map[0] = rule; 2658200855Sluigi chain->id = rule->id = 1; 2659185895Szec 2660200838Sluigi IPFW_LOCK_INIT(chain); 2661244571Smelifaro ipfw_dyn_init(chain); 2662195862Sjulian 2663195862Sjulian /* First set up some values that are compile time options */ 2664196423Sjulian V_ipfw_vnet_ready = 1; /* Open for business */ 266598943Sluigi 2666200116Sluigi /* 2667200116Sluigi * Hook the sockopt handler, and the layer2 (V_ip_fw_chk_ptr) 2668200116Sluigi * and pfil hooks for ipv4 and ipv6. Even if the latter two fail 2669200118Sluigi * we still keep the module alive because the sockopt and 2670200118Sluigi * layer2 paths are still useful. 2671200118Sluigi * ipfw[6]_hook return 0 on success, ENOENT on failure, 2672200118Sluigi * so we can ignore the exact return value and just set a flag. 2673200116Sluigi * 2674200118Sluigi * Note that V_fw[6]_enable are manipulated by a SYSCTL_PROC so 2675200118Sluigi * changes in the underlying (per-vnet) variables trigger 2676200118Sluigi * immediate hook()/unhook() calls. 2677200118Sluigi * In layer2 we have the same behaviour, except that V_ether_ipfw 2678200118Sluigi * is checked on each packet because there are no pfil hooks. 2679200116Sluigi */ 2680197952Sjulian V_ip_fw_ctl_ptr = ipfw_ctl; 2681197952Sjulian V_ip_fw_chk_ptr = ipfw_chk; 2682201122Sluigi error = ipfw_attach_hooks(1); 2683200116Sluigi return (error); 2684195862Sjulian} 2685195862Sjulian 2686200601Sluigi/* 2687195862Sjulian * Called for the removal of each instance. 2688195862Sjulian */ 2689195862Sjulianstatic int 2690195862Sjulianvnet_ipfw_uninit(const void *unused) 2691195862Sjulian{ 2692200855Sluigi struct ip_fw *reap, *rule; 2693200838Sluigi struct ip_fw_chain *chain = &V_layer3_chain; 2694200855Sluigi int i; 2695120141Ssam 2696196423Sjulian V_ipfw_vnet_ready = 0; /* tell new callers to go away */ 2697200116Sluigi /* 2698200116Sluigi * disconnect from ipv4, ipv6, layer2 and sockopt. 2699200116Sluigi * Then grab, release and grab again the WLOCK so we make 2700200116Sluigi * sure the update is propagated and nobody will be in. 2701200116Sluigi */ 2702201122Sluigi (void)ipfw_attach_hooks(0 /* detach */); 2703197952Sjulian V_ip_fw_chk_ptr = NULL; 2704197952Sjulian V_ip_fw_ctl_ptr = NULL; 2705200855Sluigi IPFW_UH_WLOCK(chain); 2706200855Sluigi IPFW_UH_WUNLOCK(chain); 2707200855Sluigi IPFW_UH_WLOCK(chain); 2708200116Sluigi 2709200838Sluigi IPFW_WLOCK(chain); 2710234597Smelifaro ipfw_dyn_uninit(0); /* run the callout_drain */ 2711200838Sluigi IPFW_WUNLOCK(chain); 2712200116Sluigi 2713204837Sbz ipfw_destroy_tables(chain); 2714200855Sluigi reap = NULL; 2715234597Smelifaro IPFW_WLOCK(chain); 2716200855Sluigi for (i = 0; i < chain->n_rules; i++) { 2717200855Sluigi rule = chain->map[i]; 2718200855Sluigi rule->x_next = reap; 2719200855Sluigi reap = rule; 2720200855Sluigi } 2721200855Sluigi if (chain->map) 2722200855Sluigi free(chain->map, M_IPFW); 2723200838Sluigi IPFW_WUNLOCK(chain); 2724200855Sluigi IPFW_UH_WUNLOCK(chain); 2725195862Sjulian if (reap != NULL) 2726200590Sluigi ipfw_reap_rules(reap); 2727200838Sluigi IPFW_LOCK_DESTROY(chain); 2728200580Sluigi ipfw_dyn_uninit(1); /* free the remaining parts */ 2729195862Sjulian return 0; 2730195862Sjulian} 2731149020Sbz 2732196423Sjulian/* 2733196423Sjulian * Module event handler. 2734196423Sjulian * In general we have the choice of handling most of these events by the 2735196423Sjulian * event handler or by the (VNET_)SYS(UN)INIT handlers. I have chosen to 2736196423Sjulian * use the SYSINIT handlers as they are more capable of expressing the 2737196423Sjulian * flow of control during module and vnet operations, so this is just 2738196423Sjulian * a skeleton. Note there is no SYSINIT equivalent of the module 2739196423Sjulian * SHUTDOWN handler, but we don't have anything to do in that case anyhow. 2740196423Sjulian */ 2741196423Sjulianstatic int 2742196423Sjulianipfw_modevent(module_t mod, int type, void *unused) 2743196423Sjulian{ 2744196423Sjulian int err = 0; 2745149020Sbz 2746196423Sjulian switch (type) { 2747196423Sjulian case MOD_LOAD: 2748196423Sjulian /* Called once at module load or 2749196423Sjulian * system boot if compiled in. */ 2750196423Sjulian break; 2751197952Sjulian case MOD_QUIESCE: 2752197952Sjulian /* Called before unload. May veto unloading. */ 2753197952Sjulian break; 2754196423Sjulian case MOD_UNLOAD: 2755196423Sjulian /* Called during unload. */ 2756196423Sjulian break; 2757196423Sjulian case MOD_SHUTDOWN: 2758196423Sjulian /* Called during system shutdown. */ 2759196423Sjulian break; 2760196423Sjulian default: 2761196423Sjulian err = EOPNOTSUPP; 2762196423Sjulian break; 2763196423Sjulian } 2764196423Sjulian return err; 2765196423Sjulian} 2766195862Sjulian 2767196423Sjulianstatic moduledata_t ipfwmod = { 2768196423Sjulian "ipfw", 2769196423Sjulian ipfw_modevent, 2770196423Sjulian 0 2771196423Sjulian}; 2772196423Sjulian 2773196423Sjulian/* Define startup order. */ 2774196423Sjulian#define IPFW_SI_SUB_FIREWALL SI_SUB_PROTO_IFATTACHDOMAIN 2775196423Sjulian#define IPFW_MODEVENT_ORDER (SI_ORDER_ANY - 255) /* On boot slot in here. */ 2776196423Sjulian#define IPFW_MODULE_ORDER (IPFW_MODEVENT_ORDER + 1) /* A little later. */ 2777196423Sjulian#define IPFW_VNET_ORDER (IPFW_MODEVENT_ORDER + 2) /* Later still. */ 2778196423Sjulian 2779196423SjulianDECLARE_MODULE(ipfw, ipfwmod, IPFW_SI_SUB_FIREWALL, IPFW_MODEVENT_ORDER); 2780196423SjulianMODULE_VERSION(ipfw, 2); 2781196423Sjulian/* should declare some dependencies here */ 2782196423Sjulian 2783196423Sjulian/* 2784196423Sjulian * Starting up. Done in order after ipfwmod() has been called. 2785196423Sjulian * VNET_SYSINIT is also called for each existing vnet and each new vnet. 2786196423Sjulian */ 2787196423SjulianSYSINIT(ipfw_init, IPFW_SI_SUB_FIREWALL, IPFW_MODULE_ORDER, 2788196423Sjulian ipfw_init, NULL); 2789196423SjulianVNET_SYSINIT(vnet_ipfw_init, IPFW_SI_SUB_FIREWALL, IPFW_VNET_ORDER, 2790196423Sjulian vnet_ipfw_init, NULL); 2791195862Sjulian 2792196423Sjulian/* 2793196423Sjulian * Closing up shop. These are done in REVERSE ORDER, but still 2794196423Sjulian * after ipfwmod() has been called. Not called on reboot. 2795196423Sjulian * VNET_SYSUNINIT is also called for each exiting vnet as it exits. 2796196423Sjulian * or when the module is unloaded. 2797196423Sjulian */ 2798196423SjulianSYSUNINIT(ipfw_destroy, IPFW_SI_SUB_FIREWALL, IPFW_MODULE_ORDER, 2799196423Sjulian ipfw_destroy, NULL); 2800196423SjulianVNET_SYSUNINIT(vnet_ipfw_uninit, IPFW_SI_SUB_FIREWALL, IPFW_VNET_ORDER, 2801196423Sjulian vnet_ipfw_uninit, NULL); 2802200601Sluigi/* end of file */ 2803