external/bsd/tcpdump/dist/print-pflog.c

   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 #include <sys/cdefs.h>
  23 #ifndef lint
  24 __RCSID("$NetBSD: print-pflog.c,v 1.6 2015/03/31 21:59:35 christos Exp $");
  25 #endif
  26
  27 #define NETDISSECT_REWORKED
  28 #ifdef HAVE_CONFIG_H
  29 #include "config.h"
  30 #endif
  31
  32 #ifndef HAVE_NET_PFVAR_H
  33 #error "No pf headers available"
  34 #endif
  35 #include <sys/types.h>
  36 #include <sys/socket.h>
  37 #include <net/if.h>
  38 #include <net/pfvar.h>
  39 #include <net/if_pflog.h>
  40
  41 #include <tcpdump-stdinc.h>
  42
  43 #include "interface.h"
  44 #include "extract.h"
  45
  46 static const char tstr[] = "[|pflog]";
  47
  48 static const struct tok pf_reasons[] = {
  49         { 0,    "0(match)" },
  50         { 1,    "1(bad-offset)" },
  51         { 2,    "2(fragment)" },
  52         { 3,    "3(short)" },
  53         { 4,    "4(normalize)" },
  54         { 5,    "5(memory)" },
  55         { 6,    "6(bad-timestamp)" },
  56         { 7,    "7(congestion)" },
  57         { 8,    "8(ip-option)" },
  58         { 9,    "9(proto-cksum)" },
  59         { 10,   "10(state-mismatch)" },
  60         { 11,   "11(state-insert)" },
  61         { 12,   "12(state-limit)" },
  62         { 13,   "13(src-limit)" },
  63         { 14,   "14(synproxy)" },
  64         { 0,    NULL }
  65 };
  66
  67 static const struct tok pf_actions[] = {
  68         { PF_PASS,              "pass" },
  69         { PF_DROP,              "block" },
  70         { PF_SCRUB,             "scrub" },
  71         { PF_NAT,               "nat" },
  72         { PF_NONAT,             "nat" },
  73         { PF_BINAT,             "binat" },
  74         { PF_NOBINAT,           "binat" },
  75         { PF_RDR,               "rdr" },
  76         { PF_NORDR,             "rdr" },
  77         { PF_SYNPROXY_DROP,     "synproxy-drop" },
  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;
  96
  97         rulenr = EXTRACT_32BITS(&hdr->rulenr);
  98         subrulenr = EXTRACT_32BITS(&hdr->subrulenr);
  99         if (subrulenr == (uint32_t)-1)
 100                 ND_PRINT((ndo, "rule %u/", rulenr));
 101         else
 102                 ND_PRINT((ndo, "rule %u.%s.%u/", rulenr, hdr->ruleset, subrulenr));
 103
 104         ND_PRINT((ndo, "%s: %s %s on %s: ",
 105             tok2str(pf_reasons, "unkn(%u)", hdr->reason),
 106             tok2str(pf_actions, "unkn(%u)", hdr->action),
 107             tok2str(pf_directions, "unkn(%u)", hdr->dir),
 108             hdr->ifname));
 109 }
 110
 111 u_int
 112 pflog_if_print(netdissect_options *ndo, const struct pcap_pkthdr *h,
 113                register 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         /* check length */
 122         if (caplen < sizeof(uint8_t)) {
 123                 ND_PRINT((ndo, "%s", tstr));
 124                 return (caplen);
 125         }
 126
 127 #define MIN_PFLOG_HDRLEN        45
 128         hdr = (struct pfloghdr *)p;
 129         if (hdr->length < MIN_PFLOG_HDRLEN) {
 130                 ND_PRINT((ndo, "[pflog: invalid header length!]"));
 131                 return (hdr->length);   /* XXX: not really */
 132         }
 133         hdrlen = BPF_WORDALIGN(hdr->length);
 134
 135         if (caplen < hdrlen) {
 136                 ND_PRINT((ndo, "%s", tstr));
 137                 return (hdrlen);        /* XXX: true? */
 138         }
 139
 140         /* print what we know */
 141         hdr = (struct pfloghdr *)p;
 142         ND_TCHECK(*hdr);
 143         if (ndo->ndo_eflag)
 144                 pflog_print(ndo, hdr);
 145
 146         /* skip to the real packet */
 147         af = hdr->af;
 148         length -= hdrlen;
 149         caplen -= hdrlen;
 150         p += hdrlen;
 151         switch (af) {
 152
 153                 case AF_INET:
 154 #if OPENBSD_AF_INET != AF_INET
 155                 case OPENBSD_AF_INET:           /* XXX: read pcap files */
 156 #endif
 157                         ip_print(ndo, p, length);
 158                         break;
 159
 160 #if defined(AF_INET6) || defined(OPENBSD_AF_INET6)
 161 #ifdef AF_INET6
 162                 case AF_INET6:
 163 #endif /* AF_INET6 */
 164 #if !defined(AF_INET6) || OPENBSD_AF_INET6 != AF_INET6
 165                 case OPENBSD_AF_INET6:          /* XXX: read pcap files */
 166 #endif /* !defined(AF_INET6) || OPENBSD_AF_INET6 != AF_INET6 */
 167                         ip6_print(ndo, p, length);
 168                         break;
 169 #endif /* defined(AF_INET6) || defined(OPENBSD_AF_INET6) */
 170
 171         default:
 172                 /* address family not handled, print raw packet */
 173                 if (!ndo->ndo_eflag)
 174                         pflog_print(ndo, hdr);
 175                 if (!ndo->ndo_suppress_default_print)
 176                         ND_DEFAULTPRINT(p, caplen);
 177         }
 178
 179         return (hdrlen);
 180 trunc:
 181         ND_PRINT((ndo, "%s", tstr));
 182         return (hdrlen);
 183 }
 184
 185 /*
 186  * Local Variables:
 187  * c-style: whitesmith
 188  * c-basic-offset: 8
 189  * End:
 190  */