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: *BSD/Darwin packet filter log file printer */
23
24 #ifdef HAVE_CONFIG_H
25 #include <config.h>
26 #endif
27
28 #include "netdissect-stdinc.h"
29
30 #include "netdissect.h"
31 #include "extract.h"
32 #include "af.h"
33
34 #include "pflog.h"
35
36 static const struct tok pf_reasons[] = {
37 { PFRES_MATCH, "0(match)" },
38 { PFRES_BADOFF, "1(bad-offset)" },
39 { PFRES_FRAG, "2(fragment)" },
40 { PFRES_NORM, "3(short)" },
41 { PFRES_NORM, "4(normalize)" },
42 { PFRES_MEMORY, "5(memory)" },
43 { PFRES_TS, "6(bad-timestamp)" },
44 { PFRES_CONGEST, "7(congestion)" },
45 { PFRES_IPOPTIONS, "8(ip-option)" },
46 { PFRES_PROTCKSUM, "9(proto-cksum)" },
47 { PFRES_BADSTATE, "10(state-mismatch)" },
48 { PFRES_STATEINS, "11(state-insert)" },
49 { PFRES_MAXSTATES, "12(state-limit)" },
50 { PFRES_SRCLIMIT, "13(src-limit)" },
51 { PFRES_SYNPROXY, "14(synproxy)" },
52 #if defined(__FreeBSD__)
53 { PFRES_MAPFAILED, "15(map-failed)" },
54 #elif defined(__NetBSD__)
55 { PFRES_STATELOCKED, "15(state-locked)" },
56 #elif defined(__OpenBSD__)
57 { PFRES_TRANSLATE, "15(translate)" },
58 { PFRES_NOROUTE, "16(no-route)" },
59 #elif defined(__APPLE__)
60 { PFRES_DUMMYNET, "15(dummynet)" },
61 #endif
62 { 0, NULL }
63 };
64
65 static const struct tok pf_actions[] = {
66 { PF_PASS, "pass" },
67 { PF_DROP, "block" },
68 { PF_SCRUB, "scrub" },
69 { PF_NAT, "nat" },
70 { PF_NONAT, "nonat" },
71 { PF_BINAT, "binat" },
72 { PF_NOBINAT, "nobinat" },
73 { PF_RDR, "rdr" },
74 { PF_NORDR, "nordr" },
75 { PF_SYNPROXY_DROP, "synproxy-drop" },
76 #if defined(__FreeBSD__)
77 { PF_DEFER, "defer" },
78 #elif defined(__OpenBSD__)
79 { PF_DEFER, "defer" },
80 { PF_MATCH, "match" },
81 { PF_DIVERT, "divert" },
82 { PF_RT, "rt" },
83 { PF_AFRT, "afrt" },
84 #elif defined(__APPLE__)
85 { PF_DUMMYNET, "dummynet" },
86 { PF_NODUMMYNET, "nodummynet" },
87 { PF_NAT64, "nat64" },
88 { PF_NONAT64, "nonat64" },
89 #endif
90 { 0, NULL }
91 };
92
93 static const struct tok pf_directions[] = {
94 { PF_INOUT, "in/out" },
95 { PF_IN, "in" },
96 { PF_OUT, "out" },
97 #if defined(__OpenBSD__)
98 { PF_FWD, "fwd" },
99 #endif
100 { 0, NULL }
101 };
102
103 static void
pflog_print(netdissect_options * ndo,const struct pfloghdr * hdr)104 pflog_print(netdissect_options *ndo, const struct pfloghdr *hdr)
105 {
106 uint32_t rulenr, subrulenr;
107
108 ndo->ndo_protocol = "pflog";
109 rulenr = GET_BE_U_4(&hdr->rulenr);
110 subrulenr = GET_BE_U_4(&hdr->subrulenr);
111 if (subrulenr == (uint32_t)-1)
112 ND_PRINT("rule %u/", rulenr);
113 else {
114 ND_PRINT("rule %u.", rulenr);
115 nd_printjnp(ndo, (const u_char*)hdr->ruleset, PFLOG_RULESET_NAME_SIZE);
116 ND_PRINT(".%u/", subrulenr);
117 }
118
119 ND_PRINT("%s: %s %s on ",
120 tok2str(pf_reasons, "unkn(%u)", GET_U_1(&hdr->reason)),
121 tok2str(pf_actions, "unkn(%u)", GET_U_1(&hdr->action)),
122 tok2str(pf_directions, "unkn(%u)", GET_U_1(&hdr->dir)));
123 nd_printjnp(ndo, (const u_char*)hdr->ifname, PFLOG_IFNAMSIZ);
124 ND_PRINT(": ");
125 }
126
127 void
pflog_if_print(netdissect_options * ndo,const struct pcap_pkthdr * h,const u_char * p)128 pflog_if_print(netdissect_options *ndo, const struct pcap_pkthdr *h,
129 const u_char *p)
130 {
131 u_int length = h->len;
132 u_int hdrlen;
133 u_int caplen = h->caplen;
134 const struct pfloghdr *hdr;
135 uint8_t af;
136
137 ndo->ndo_protocol = "pflog";
138 /* check length */
139 if (caplen < sizeof(uint8_t)) {
140 nd_print_trunc(ndo);
141 ndo->ndo_ll_hdr_len += h->caplen;
142 return;
143 }
144
145 #define MIN_PFLOG_HDRLEN 45
146 hdr = (const struct pfloghdr *)p;
147 if (GET_U_1(&hdr->length) < MIN_PFLOG_HDRLEN) {
148 ND_PRINT("[pflog: invalid header length!]");
149 ndo->ndo_ll_hdr_len += GET_U_1(&hdr->length); /* XXX: not really */
150 return;
151 }
152 hdrlen = roundup2(hdr->length, 4);
153
154 if (caplen < hdrlen) {
155 nd_print_trunc(ndo);
156 ndo->ndo_ll_hdr_len += hdrlen; /* XXX: true? */
157 return;
158 }
159
160 /* print what we know */
161 ND_TCHECK_SIZE(hdr);
162 if (ndo->ndo_eflag)
163 pflog_print(ndo, hdr);
164
165 /* skip to the real packet */
166 af = GET_U_1(&hdr->af);
167 length -= hdrlen;
168 caplen -= hdrlen;
169 p += hdrlen;
170 switch (af) {
171
172 /*
173 * If there's a system that doesn't use the AF_INET
174 * from 4.2BSD, feel free to add its value to af.h
175 * and use it here.
176 *
177 * Hopefully, there isn't.
178 */
179 case BSD_AFNUM_INET:
180 ip_print(ndo, p, length);
181 break;
182
183 /*
184 * Try all AF_INET6 values for all systems with pflog,
185 * including Darwin.
186 */
187 case BSD_AFNUM_INET6_BSD:
188 case BSD_AFNUM_INET6_FREEBSD:
189 case BSD_AFNUM_INET6_DARWIN:
190 ip6_print(ndo, p, length);
191 break;
192
193 default:
194 /* address family not handled, print raw packet */
195 if (!ndo->ndo_eflag)
196 pflog_print(ndo, hdr);
197 if (!ndo->ndo_suppress_default_print)
198 ND_DEFAULTPRINT(p, caplen);
199 }
200
201 ndo->ndo_ll_hdr_len += hdrlen;
202 return;
203 trunc:
204 nd_print_trunc(ndo);
205 ndo->ndo_ll_hdr_len += hdrlen;
206 }
207