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
42static const char tstr[] = "[|pflog]";
43
44static 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	{ 0,	NULL }
61};
62
63static const struct tok pf_actions[] = {
64	{ PF_PASS,		"pass" },
65	{ PF_DROP,		"block" },
66	{ PF_SCRUB,		"scrub" },
67	{ PF_NAT,		"nat" },
68	{ PF_NONAT,		"nat" },
69	{ PF_BINAT,		"binat" },
70	{ PF_NOBINAT,		"binat" },
71	{ PF_RDR,		"rdr" },
72	{ PF_NORDR,		"rdr" },
73	{ PF_SYNPROXY_DROP,	"synproxy-drop" },
74	{ 0,			NULL }
75};
76
77static const struct tok pf_directions[] = {
78	{ PF_INOUT,	"in/out" },
79	{ PF_IN,	"in" },
80	{ PF_OUT,	"out" },
81	{ 0,		NULL }
82};
83
84/* For reading capture files on other systems */
85#define	OPENBSD_AF_INET		2
86#define	OPENBSD_AF_INET6	24
87
88static void
89pflog_print(netdissect_options *ndo, const struct pfloghdr *hdr)
90{
91	uint32_t rulenr, subrulenr;
92
93	rulenr = EXTRACT_32BITS(&hdr->rulenr);
94	subrulenr = EXTRACT_32BITS(&hdr->subrulenr);
95	if (subrulenr == (uint32_t)-1)
96		ND_PRINT((ndo, "rule %u/", rulenr));
97	else
98		ND_PRINT((ndo, "rule %u.%s.%u/", rulenr, hdr->ruleset, subrulenr));
99
100	ND_PRINT((ndo, "%s", tok2str(pf_reasons, "unkn(%u)", hdr->reason)));
101
102	if (hdr->uid != UID_MAX)
103		ND_PRINT((ndo, " [uid %u]", (unsigned)hdr->uid));
104
105	ND_PRINT((ndo, ": %s %s on %s: ",
106	    tok2str(pf_actions, "unkn(%u)", hdr->action),
107	    tok2str(pf_directions, "unkn(%u)", hdr->dir),
108	    hdr->ifname));
109}
110
111u_int
112pflog_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 = (const 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	ND_TCHECK(*hdr);
142	if (ndo->ndo_eflag)
143		pflog_print(ndo, hdr);
144
145	/* skip to the real packet */
146	af = hdr->af;
147	length -= hdrlen;
148	caplen -= hdrlen;
149	p += hdrlen;
150	switch (af) {
151
152		case AF_INET:
153#if OPENBSD_AF_INET != AF_INET
154		case OPENBSD_AF_INET:		/* XXX: read pcap files */
155#endif
156		        ip_print(ndo, p, length);
157			break;
158
159#if defined(AF_INET6) || defined(OPENBSD_AF_INET6)
160#ifdef AF_INET6
161		case AF_INET6:
162#endif /* AF_INET6 */
163#if !defined(AF_INET6) || OPENBSD_AF_INET6 != AF_INET6
164		case OPENBSD_AF_INET6:		/* XXX: read pcap files */
165#endif /* !defined(AF_INET6) || OPENBSD_AF_INET6 != AF_INET6 */
166			ip6_print(ndo, p, length);
167			break;
168#endif /* defined(AF_INET6) || defined(OPENBSD_AF_INET6) */
169
170	default:
171		/* address family not handled, print raw packet */
172		if (!ndo->ndo_eflag)
173			pflog_print(ndo, hdr);
174		if (!ndo->ndo_suppress_default_print)
175			ND_DEFAULTPRINT(p, caplen);
176	}
177
178	return (hdrlen);
179trunc:
180	ND_PRINT((ndo, "%s", tstr));
181	return (hdrlen);
182}
183
184/*
185 * Local Variables:
186 * c-style: whitesmith
187 * c-basic-offset: 8
188 * End:
189 */
190