1 /* 2 * Copyright (c) 1990, 1991, 1993, 1994, 1995, 1996 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that: (1) source code distributions 7 * retain the above copyright notice and this paragraph in its entirety, (2) 8 * distributions including binary code include the above copyright notice and 9 * this paragraph in its entirety in the documentation or other materials 10 * provided with the distribution, and (3) all advertising materials mentioning 11 * features or use of this software display the following acknowledgement: 12 * ``This product includes software developed by the University of California, 13 * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of 14 * the University nor the names of its contributors may be used to endorse 15 * or promote products derived from this software without specific prior 16 * written permission. 17 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED 18 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF 19 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. 20 */ 21 22 /* \summary: OpenBSD packet filter log file printer */ 23 24 #ifdef HAVE_CONFIG_H 25 #include <config.h> 26 #endif 27 28 #ifndef HAVE_NET_PFVAR_H 29 #error "No pf headers available" 30 #endif 31 #include <sys/types.h> 32 #include <sys/socket.h> 33 #include <net/if.h> 34 #include <net/pf/pfvar.h> 35 #include <net/pf/if_pflog.h> 36 37 #include "netdissect-stdinc.h" 38 39 #include "netdissect.h" 40 #include "extract.h" 41 42 43 static const struct tok pf_reasons[] = { 44 { 0, "0(match)" }, 45 { 1, "1(bad-offset)" }, 46 { 2, "2(fragment)" }, 47 { 3, "3(short)" }, 48 { 4, "4(normalize)" }, 49 { 5, "5(memory)" }, 50 { 6, "6(bad-timestamp)" }, 51 { 7, "7(congestion)" }, 52 { 8, "8(ip-option)" }, 53 { 9, "9(proto-cksum)" }, 54 { 10, "10(state-mismatch)" }, 55 { 11, "11(state-insert)" }, 56 { 12, "12(state-limit)" }, 57 { 13, "13(src-limit)" }, 58 { 14, "14(synproxy)" }, 59 { 0, NULL } 60 }; 61 62 static const struct tok pf_actions[] = { 63 { PF_PASS, "pass" }, 64 { PF_DROP, "block" }, 65 { PF_SCRUB, "scrub" }, 66 { PF_NAT, "nat" }, 67 { PF_NONAT, "nat" }, 68 { PF_BINAT, "binat" }, 69 { PF_NOBINAT, "binat" }, 70 { PF_RDR, "rdr" }, 71 { PF_NORDR, "rdr" }, 72 { PF_SYNPROXY_DROP, "synproxy-drop" }, 73 { 0, NULL } 74 }; 75 76 static const struct tok pf_directions[] = { 77 { PF_INOUT, "in/out" }, 78 { PF_IN, "in" }, 79 { PF_OUT, "out" }, 80 { 0, NULL } 81 }; 82 83 /* For reading capture files on other systems */ 84 #define OPENBSD_AF_INET 2 85 #define OPENBSD_AF_INET6 24 86 87 static void 88 pflog_print(netdissect_options *ndo, const struct pfloghdr *hdr) 89 { 90 uint32_t rulenr, subrulenr; 91 92 ndo->ndo_protocol = "pflog"; 93 rulenr = GET_BE_U_4(&hdr->rulenr); 94 subrulenr = GET_BE_U_4(&hdr->subrulenr); 95 if (subrulenr == (uint32_t)-1) 96 ND_PRINT("rule %u/", rulenr); 97 else { 98 ND_PRINT("rule %u.", rulenr); 99 nd_printjnp(ndo, (const u_char*)hdr->ruleset, PFLOG_RULESET_NAME_SIZE); 100 ND_PRINT(".%u/", subrulenr); 101 } 102 103 ND_PRINT("%s: %s %s on ", 104 tok2str(pf_reasons, "unkn(%u)", GET_U_1(&hdr->reason)), 105 tok2str(pf_actions, "unkn(%u)", GET_U_1(&hdr->action)), 106 tok2str(pf_directions, "unkn(%u)", GET_U_1(&hdr->dir))); 107 nd_printjnp(ndo, (const u_char*)hdr->ifname, IFNAMSIZ); 108 ND_PRINT(": "); 109 } 110 111 void 112 pflog_if_print(netdissect_options *ndo, const struct pcap_pkthdr *h, 113 const u_char *p) 114 { 115 u_int length = h->len; 116 u_int hdrlen; 117 u_int caplen = h->caplen; 118 const struct pfloghdr *hdr; 119 uint8_t af; 120 121 ndo->ndo_protocol = "pflog"; 122 /* check length */ 123 if (caplen < sizeof(uint8_t)) { 124 nd_print_trunc(ndo); 125 ndo->ndo_ll_hdr_len += h->caplen; 126 return; 127 } 128 129 #define MIN_PFLOG_HDRLEN 45 130 hdr = (const struct pfloghdr *)p; 131 if (GET_U_1(&hdr->length) < MIN_PFLOG_HDRLEN) { 132 ND_PRINT("[pflog: invalid header length!]"); 133 ndo->ndo_ll_hdr_len += GET_U_1(&hdr->length); /* XXX: not really */ 134 return; 135 } 136 hdrlen = BPF_WORDALIGN(hdr->length); 137 138 if (caplen < hdrlen) { 139 nd_print_trunc(ndo); 140 ndo->ndo_ll_hdr_len += hdrlen; /* XXX: true? */ 141 return; 142 } 143 144 /* print what we know */ 145 ND_TCHECK_SIZE(hdr); 146 if (ndo->ndo_eflag) 147 pflog_print(ndo, hdr); 148 149 /* skip to the real packet */ 150 af = GET_U_1(&hdr->af); 151 length -= hdrlen; 152 caplen -= hdrlen; 153 p += hdrlen; 154 switch (af) { 155 156 case AF_INET: 157 #if OPENBSD_AF_INET != AF_INET 158 case OPENBSD_AF_INET: /* XXX: read pcap files */ 159 #endif 160 ip_print(ndo, p, length); 161 break; 162 163 #if defined(AF_INET6) || defined(OPENBSD_AF_INET6) 164 #ifdef AF_INET6 165 case AF_INET6: 166 #endif /* AF_INET6 */ 167 #if !defined(AF_INET6) || OPENBSD_AF_INET6 != AF_INET6 168 case OPENBSD_AF_INET6: /* XXX: read pcap files */ 169 #endif /* !defined(AF_INET6) || OPENBSD_AF_INET6 != AF_INET6 */ 170 ip6_print(ndo, p, length); 171 break; 172 #endif /* defined(AF_INET6) || defined(OPENBSD_AF_INET6) */ 173 174 default: 175 /* address family not handled, print raw packet */ 176 if (!ndo->ndo_eflag) 177 pflog_print(ndo, hdr); 178 if (!ndo->ndo_suppress_default_print) 179 ND_DEFAULTPRINT(p, caplen); 180 } 181 182 ndo->ndo_ll_hdr_len += hdrlen; 183 return; 184 trunc: 185 nd_print_trunc(ndo); 186 ndo->ndo_ll_hdr_len += hdrlen; 187 } 188