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