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/pf/pfvar.h>
35 #include <net/pf/if_pflog.h>
36
37 #include "netdissect-stdinc.h"
38
39 #include "netdissect.h"
40 #include "extract.h"
41
42
43 static const struct tok pf_reasons[] = {
44 { 0, "0(match)" },
45 { 1, "1(bad-offset)" },
46 { 2, "2(fragment)" },
47 { 3, "3(short)" },
48 { 4, "4(normalize)" },
49 { 5, "5(memory)" },
50 { 6, "6(bad-timestamp)" },
51 { 7, "7(congestion)" },
52 { 8, "8(ip-option)" },
53 { 9, "9(proto-cksum)" },
54 { 10, "10(state-mismatch)" },
55 { 11, "11(state-insert)" },
56 { 12, "12(state-limit)" },
57 { 13, "13(src-limit)" },
58 { 14, "14(synproxy)" },
59 { 0, NULL }
60 };
61
62 static const struct tok pf_actions[] = {
63 { PF_PASS, "pass" },
64 { PF_DROP, "block" },
65 { PF_SCRUB, "scrub" },
66 { PF_NAT, "nat" },
67 { PF_NONAT, "nat" },
68 { PF_BINAT, "binat" },
69 { PF_NOBINAT, "binat" },
70 { PF_RDR, "rdr" },
71 { PF_NORDR, "rdr" },
72 { PF_SYNPROXY_DROP, "synproxy-drop" },
73 { 0, NULL }
74 };
75
76 static const struct tok pf_directions[] = {
77 { PF_INOUT, "in/out" },
78 { PF_IN, "in" },
79 { PF_OUT, "out" },
80 { 0, NULL }
81 };
82
83 /* For reading capture files on other systems */
84 #define OPENBSD_AF_INET 2
85 #define OPENBSD_AF_INET6 24
86
87 static void
pflog_print(netdissect_options * ndo,const struct pfloghdr * hdr)88 pflog_print(netdissect_options *ndo, const struct pfloghdr *hdr)
89 {
90 uint32_t rulenr, subrulenr;
91
92 ndo->ndo_protocol = "pflog";
93 rulenr = GET_BE_U_4(&hdr->rulenr);
94 subrulenr = GET_BE_U_4(&hdr->subrulenr);
95 if (subrulenr == (uint32_t)-1)
96 ND_PRINT("rule %u/", rulenr);
97 else {
98 ND_PRINT("rule %u.", rulenr);
99 nd_printjnp(ndo, (const u_char*)hdr->ruleset, PFLOG_RULESET_NAME_SIZE);
100 ND_PRINT(".%u/", subrulenr);
101 }
102
103 ND_PRINT("%s: %s %s on ",
104 tok2str(pf_reasons, "unkn(%u)", GET_U_1(&hdr->reason)),
105 tok2str(pf_actions, "unkn(%u)", GET_U_1(&hdr->action)),
106 tok2str(pf_directions, "unkn(%u)", GET_U_1(&hdr->dir)));
107 nd_printjnp(ndo, (const u_char*)hdr->ifname, IFNAMSIZ);
108 ND_PRINT(": ");
109 }
110
111 void
pflog_if_print(netdissect_options * ndo,const struct pcap_pkthdr * h,const u_char * p)112 pflog_if_print(netdissect_options *ndo, const struct pcap_pkthdr *h,
113 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 ndo->ndo_protocol = "pflog";
122 /* check length */
123 if (caplen < sizeof(uint8_t)) {
124 nd_print_trunc(ndo);
125 ndo->ndo_ll_hdr_len += h->caplen;
126 return;
127 }
128
129 #define MIN_PFLOG_HDRLEN 45
130 hdr = (const struct pfloghdr *)p;
131 if (GET_U_1(&hdr->length) < MIN_PFLOG_HDRLEN) {
132 ND_PRINT("[pflog: invalid header length!]");
133 ndo->ndo_ll_hdr_len += GET_U_1(&hdr->length); /* XXX: not really */
134 return;
135 }
136 hdrlen = BPF_WORDALIGN(hdr->length);
137
138 if (caplen < hdrlen) {
139 nd_print_trunc(ndo);
140 ndo->ndo_ll_hdr_len += hdrlen; /* XXX: true? */
141 return;
142 }
143
144 /* print what we know */
145 ND_TCHECK_SIZE(hdr);
146 if (ndo->ndo_eflag)
147 pflog_print(ndo, hdr);
148
149 /* skip to the real packet */
150 af = GET_U_1(&hdr->af);
151 length -= hdrlen;
152 caplen -= hdrlen;
153 p += hdrlen;
154 switch (af) {
155
156 case AF_INET:
157 #if OPENBSD_AF_INET != AF_INET
158 case OPENBSD_AF_INET: /* XXX: read pcap files */
159 #endif
160 ip_print(ndo, p, length);
161 break;
162
163 #if defined(AF_INET6) || defined(OPENBSD_AF_INET6)
164 #ifdef AF_INET6
165 case AF_INET6:
166 #endif /* AF_INET6 */
167 #if !defined(AF_INET6) || OPENBSD_AF_INET6 != AF_INET6
168 case OPENBSD_AF_INET6: /* XXX: read pcap files */
169 #endif /* !defined(AF_INET6) || OPENBSD_AF_INET6 != AF_INET6 */
170 ip6_print(ndo, p, length);
171 break;
172 #endif /* defined(AF_INET6) || defined(OPENBSD_AF_INET6) */
173
174 default:
175 /* address family not handled, print raw packet */
176 if (!ndo->ndo_eflag)
177 pflog_print(ndo, hdr);
178 if (!ndo->ndo_suppress_default_print)
179 ND_DEFAULTPRINT(p, caplen);
180 }
181
182 ndo->ndo_ll_hdr_len += hdrlen;
183 return;
184 trunc:
185 nd_print_trunc(ndo);
186 ndo->ndo_ll_hdr_len += hdrlen;
187 }
188