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 { 0, NULL }
61 };
62
63 static 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
77 static 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
88 static void
pflog_print(netdissect_options * ndo,const struct pfloghdr * hdr)89 pflog_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: %s %s on %s: ",
101 tok2str(pf_reasons, "unkn(%u)", hdr->reason),
102 tok2str(pf_actions, "unkn(%u)", hdr->action),
103 tok2str(pf_directions, "unkn(%u)", hdr->dir),
104 hdr->ifname));
105 }
106
107 u_int
pflog_if_print(netdissect_options * ndo,const struct pcap_pkthdr * h,register const u_char * p)108 pflog_if_print(netdissect_options *ndo, const struct pcap_pkthdr *h,
109 register const u_char *p)
110 {
111 u_int length = h->len;
112 u_int hdrlen;
113 u_int caplen = h->caplen;
114 const struct pfloghdr *hdr;
115 uint8_t af;
116
117 /* check length */
118 if (caplen < sizeof(uint8_t)) {
119 ND_PRINT((ndo, "%s", tstr));
120 return (caplen);
121 }
122
123 #define MIN_PFLOG_HDRLEN 45
124 hdr = (const struct pfloghdr *)p;
125 if (hdr->length < MIN_PFLOG_HDRLEN) {
126 ND_PRINT((ndo, "[pflog: invalid header length!]"));
127 return (hdr->length); /* XXX: not really */
128 }
129 hdrlen = BPF_WORDALIGN(hdr->length);
130
131 if (caplen < hdrlen) {
132 ND_PRINT((ndo, "%s", tstr));
133 return (hdrlen); /* XXX: true? */
134 }
135
136 /* print what we know */
137 ND_TCHECK(*hdr);
138 if (ndo->ndo_eflag)
139 pflog_print(ndo, hdr);
140
141 /* skip to the real packet */
142 af = hdr->af;
143 length -= hdrlen;
144 caplen -= hdrlen;
145 p += hdrlen;
146 switch (af) {
147
148 case AF_INET:
149 #if OPENBSD_AF_INET != AF_INET
150 case OPENBSD_AF_INET: /* XXX: read pcap files */
151 #endif
152 ip_print(ndo, p, length);
153 break;
154
155 #if defined(AF_INET6) || defined(OPENBSD_AF_INET6)
156 #ifdef AF_INET6
157 case AF_INET6:
158 #endif /* AF_INET6 */
159 #if !defined(AF_INET6) || OPENBSD_AF_INET6 != AF_INET6
160 case OPENBSD_AF_INET6: /* XXX: read pcap files */
161 #endif /* !defined(AF_INET6) || OPENBSD_AF_INET6 != AF_INET6 */
162 ip6_print(ndo, p, length);
163 break;
164 #endif /* defined(AF_INET6) || defined(OPENBSD_AF_INET6) */
165
166 default:
167 /* address family not handled, print raw packet */
168 if (!ndo->ndo_eflag)
169 pflog_print(ndo, hdr);
170 if (!ndo->ndo_suppress_default_print)
171 ND_DEFAULTPRINT(p, caplen);
172 }
173
174 return (hdrlen);
175 trunc:
176 ND_PRINT((ndo, "%s", tstr));
177 return (hdrlen);
178 }
179
180 /*
181 * Local Variables:
182 * c-style: whitesmith
183 * c-basic-offset: 8
184 * End:
185 */
186