nexmon – Rev 1
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/*
* Copyright (c) 1990, 1991, 1993, 1994, 1995, 1996
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that: (1) source code distributions
* retain the above copyright notice and this paragraph in its entirety, (2)
* distributions including binary code include the above copyright notice and
* this paragraph in its entirety in the documentation or other materials
* provided with the distribution, and (3) all advertising materials mentioning
* features or use of this software display the following acknowledgement:
* ``This product includes software developed by the University of California,
* Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
* the University nor the names of its contributors may be used to endorse
* or promote products derived from this software without specific prior
* written permission.
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/
#define NETDISSECT_REWORKED
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#ifndef HAVE_NET_PFVAR_H
#error "No pf headers available"
#endif
#include <sys/types.h>
#include <sys/socket.h>
#include <net/if.h>
#include <net/pfvar.h>
#include <net/if_pflog.h>
#include <tcpdump-stdinc.h>
#include "interface.h"
#include "extract.h"
static const char tstr[] = "[|pflog]";
static const struct tok pf_reasons[] = {
{ 0, "0(match)" },
{ 1, "1(bad-offset)" },
{ 2, "2(fragment)" },
{ 3, "3(short)" },
{ 4, "4(normalize)" },
{ 5, "5(memory)" },
{ 6, "6(bad-timestamp)" },
{ 7, "7(congestion)" },
{ 8, "8(ip-option)" },
{ 9, "9(proto-cksum)" },
{ 10, "10(state-mismatch)" },
{ 11, "11(state-insert)" },
{ 12, "12(state-limit)" },
{ 13, "13(src-limit)" },
{ 14, "14(synproxy)" },
{ 0, NULL }
};
static const struct tok pf_actions[] = {
{ PF_PASS, "pass" },
{ PF_DROP, "block" },
{ PF_SCRUB, "scrub" },
{ PF_NAT, "nat" },
{ PF_NONAT, "nat" },
{ PF_BINAT, "binat" },
{ PF_NOBINAT, "binat" },
{ PF_RDR, "rdr" },
{ PF_NORDR, "rdr" },
{ PF_SYNPROXY_DROP, "synproxy-drop" },
{ 0, NULL }
};
static const struct tok pf_directions[] = {
{ PF_INOUT, "in/out" },
{ PF_IN, "in" },
{ PF_OUT, "out" },
{ 0, NULL }
};
/* For reading capture files on other systems */
#define OPENBSD_AF_INET 2
#define OPENBSD_AF_INET6 24
static void
pflog_print(netdissect_options *ndo, const struct pfloghdr *hdr)
{
uint32_t rulenr, subrulenr;
rulenr = EXTRACT_32BITS(&hdr->rulenr);
subrulenr = EXTRACT_32BITS(&hdr->subrulenr);
if (subrulenr == (uint32_t)-1)
ND_PRINT((ndo, "rule %u/", rulenr));
else
ND_PRINT((ndo, "rule %u.%s.%u/", rulenr, hdr->ruleset, subrulenr));
ND_PRINT((ndo, "%s: %s %s on %s: ",
tok2str(pf_reasons, "unkn(%u)", hdr->reason),
tok2str(pf_actions, "unkn(%u)", hdr->action),
tok2str(pf_directions, "unkn(%u)", hdr->dir),
hdr->ifname));
}
u_int
pflog_if_print(netdissect_options *ndo, const struct pcap_pkthdr *h,
register const u_char *p)
{
u_int length = h->len;
u_int hdrlen;
u_int caplen = h->caplen;
const struct pfloghdr *hdr;
uint8_t af;
/* check length */
if (caplen < sizeof(uint8_t)) {
ND_PRINT((ndo, "%s", tstr));
return (caplen);
}
#define MIN_PFLOG_HDRLEN 45
hdr = (struct pfloghdr *)p;
if (hdr->length < MIN_PFLOG_HDRLEN) {
ND_PRINT((ndo, "[pflog: invalid header length!]"));
return (hdr->length); /* XXX: not really */
}
hdrlen = BPF_WORDALIGN(hdr->length);
if (caplen < hdrlen) {
ND_PRINT((ndo, "%s", tstr));
return (hdrlen); /* XXX: true? */
}
/* print what we know */
hdr = (struct pfloghdr *)p;
ND_TCHECK(*hdr);
if (ndo->ndo_eflag)
pflog_print(ndo, hdr);
/* skip to the real packet */
af = hdr->af;
length -= hdrlen;
caplen -= hdrlen;
p += hdrlen;
switch (af) {
case AF_INET:
#if OPENBSD_AF_INET != AF_INET
case OPENBSD_AF_INET: /* XXX: read pcap files */
#endif
ip_print(ndo, p, length);
break;
#if defined(AF_INET6) || defined(OPENBSD_AF_INET6)
#ifdef AF_INET6
case AF_INET6:
#endif /* AF_INET6 */
#if !defined(AF_INET6) || OPENBSD_AF_INET6 != AF_INET6
case OPENBSD_AF_INET6: /* XXX: read pcap files */
#endif /* !defined(AF_INET6) || OPENBSD_AF_INET6 != AF_INET6 */
ip6_print(ndo, p, length);
break;
#endif /* defined(AF_INET6) || defined(OPENBSD_AF_INET6) */
default:
/* address family not handled, print raw packet */
if (!ndo->ndo_eflag)
pflog_print(ndo, hdr);
if (!ndo->ndo_suppress_default_print)
ND_DEFAULTPRINT(p, caplen);
}
return (hdrlen);
trunc:
ND_PRINT((ndo, "%s", tstr));
return (hdrlen);
}
/*
* Local Variables:
* c-style: whitesmith
* c-basic-offset: 8
* End:
*/