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/pfvar.h> 35 #include <net/if_pflog.h> 36 37 #include <netdissect-stdinc.h> 38 39 #include "netdissect.h" 40 #include "extract.h" 41 42 static const char tstr[] = "[|pflog]"; 43 44 static const struct tok pf_reasons[] = { 45 { 0, "0(match)" }, 46 { 1, "1(bad-offset)" }, 47 { 2, "2(fragment)" }, 48 { 3, "3(short)" }, 49 { 4, "4(normalize)" }, 50 { 5, "5(memory)" }, 51 { 6, "6(bad-timestamp)" }, 52 { 7, "7(congestion)" }, 53 { 8, "8(ip-option)" }, 54 { 9, "9(proto-cksum)" }, 55 { 10, "10(state-mismatch)" }, 56 { 11, "11(state-insert)" }, 57 { 12, "12(state-limit)" }, 58 { 13, "13(src-limit)" }, 59 { 14, "14(synproxy)" }, 60 { 15, "15(map-failed)" }, 61 { 0, NULL } 62 }; 63 64 static const struct tok pf_actions[] = { 65 { PF_PASS, "pass" }, 66 { PF_DROP, "block" }, 67 { PF_SCRUB, "scrub" }, 68 { PF_NOSCRUB, "scrub" }, 69 { PF_NAT, "nat" }, 70 { PF_NONAT, "nat" }, 71 { PF_BINAT, "binat" }, 72 { PF_NOBINAT, "binat" }, 73 { PF_RDR, "rdr" }, 74 { PF_NORDR, "rdr" }, 75 { PF_SYNPROXY_DROP, "synproxy-drop" }, 76 { PF_DEFER, "pfsync-defer" }, 77 { PF_MATCH, "match" }, 78 { 0, NULL } 79 }; 80 81 static const struct tok pf_directions[] = { 82 { PF_INOUT, "in/out" }, 83 { PF_IN, "in" }, 84 { PF_OUT, "out" }, 85 { 0, NULL } 86 }; 87 88 /* For reading capture files on other systems */ 89 #define OPENBSD_AF_INET 2 90 #define OPENBSD_AF_INET6 24 91 92 static void 93 pflog_print(netdissect_options *ndo, const struct pfloghdr *hdr) 94 { 95 uint32_t rulenr, subrulenr, ridentifier; 96 97 rulenr = EXTRACT_32BITS(&hdr->rulenr); 98 subrulenr = EXTRACT_32BITS(&hdr->subrulenr); 99 ridentifier = EXTRACT_32BITS(&hdr->ridentifier); 100 101 if (subrulenr == (uint32_t)-1) 102 ND_PRINT((ndo, "rule %u/", rulenr)); 103 else 104 ND_PRINT((ndo, "rule %u.%s.%u/", rulenr, hdr->ruleset, subrulenr)); 105 106 ND_PRINT((ndo, "%s", tok2str(pf_reasons, "unkn(%u)", hdr->reason))); 107 108 if (hdr->uid != UID_MAX) 109 ND_PRINT((ndo, " [uid %u]", (unsigned)hdr->uid)); 110 111 if (ridentifier != 0) 112 ND_PRINT((ndo, " [ridentifier %u]", ridentifier)); 113 114 ND_PRINT((ndo, ": %s %s on %s: ", 115 tok2str(pf_actions, "unkn(%u)", hdr->action), 116 tok2str(pf_directions, "unkn(%u)", hdr->dir), 117 hdr->ifname)); 118 } 119 120 u_int 121 pflog_if_print(netdissect_options *ndo, const struct pcap_pkthdr *h, 122 register const u_char *p) 123 { 124 u_int length = h->len; 125 u_int hdrlen; 126 u_int caplen = h->caplen; 127 const struct pfloghdr *hdr; 128 uint8_t af; 129 130 /* check length */ 131 if (caplen < sizeof(uint8_t)) { 132 ND_PRINT((ndo, "%s", tstr)); 133 return (caplen); 134 } 135 136 #define MIN_PFLOG_HDRLEN 45 137 hdr = (const struct pfloghdr *)p; 138 if (hdr->length < MIN_PFLOG_HDRLEN) { 139 ND_PRINT((ndo, "[pflog: invalid header length!]")); 140 return (hdr->length); /* XXX: not really */ 141 } 142 hdrlen = BPF_WORDALIGN(hdr->length); 143 144 if (caplen < hdrlen) { 145 ND_PRINT((ndo, "%s", tstr)); 146 return (hdrlen); /* XXX: true? */ 147 } 148 149 /* print what we know */ 150 ND_TCHECK(*hdr); 151 if (ndo->ndo_eflag) 152 pflog_print(ndo, hdr); 153 154 /* skip to the real packet */ 155 af = hdr->af; 156 length -= hdrlen; 157 caplen -= hdrlen; 158 p += hdrlen; 159 switch (af) { 160 161 case AF_INET: 162 #if OPENBSD_AF_INET != AF_INET 163 case OPENBSD_AF_INET: /* XXX: read pcap files */ 164 #endif 165 ip_print(ndo, p, length); 166 break; 167 168 #if defined(AF_INET6) || defined(OPENBSD_AF_INET6) 169 #ifdef AF_INET6 170 case AF_INET6: 171 #endif /* AF_INET6 */ 172 #if !defined(AF_INET6) || OPENBSD_AF_INET6 != AF_INET6 173 case OPENBSD_AF_INET6: /* XXX: read pcap files */ 174 #endif /* !defined(AF_INET6) || OPENBSD_AF_INET6 != AF_INET6 */ 175 ip6_print(ndo, p, length); 176 break; 177 #endif /* defined(AF_INET6) || defined(OPENBSD_AF_INET6) */ 178 179 default: 180 /* address family not handled, print raw packet */ 181 if (!ndo->ndo_eflag) 182 pflog_print(ndo, hdr); 183 if (!ndo->ndo_suppress_default_print) 184 ND_DEFAULTPRINT(p, caplen); 185 } 186 187 return (hdrlen); 188 trunc: 189 ND_PRINT((ndo, "%s", tstr)); 190 return (hdrlen); 191 } 192 193 /* 194 * Local Variables: 195 * c-style: whitesmith 196 * c-basic-offset: 8 197 * End: 198 */ 199