1 /*
2 * Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997
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 #ifndef lint
22 static const char rcsid[] _U_ =
23 "@(#) $Header: /tcpdump/master/tcpdump/print-sll.c,v 1.16.2.3 2005/11/13 12:13:00 guy Exp $ (LBL)";
24 #endif
25
26 #ifdef HAVE_CONFIG_H
27 #include "config.h"
28 #endif
29
30 #include <tcpdump-stdinc.h>
31
32 #include <stdio.h>
33 #include <string.h>
34 #include <pcap.h>
35
36 #include "interface.h"
37 #include "addrtoname.h"
38 #include "ethertype.h"
39 #include "extract.h"
40
41 #include "ether.h"
42 #include "sll.h"
43
44 const struct tok sll_pkttype_values[] = {
45 { LINUX_SLL_HOST, "In" },
46 { LINUX_SLL_BROADCAST, "B" },
47 { LINUX_SLL_MULTICAST, "M" },
48 { LINUX_SLL_OTHERHOST, "P" },
49 { LINUX_SLL_OUTGOING, "Out" },
50 { 0, NULL}
51 };
52
53 static inline void
sll_print(register const struct sll_header * sllp,u_int length)54 sll_print(register const struct sll_header *sllp, u_int length)
55 {
56 u_short ether_type;
57
58 printf("%3s ",tok2str(sll_pkttype_values,"?",EXTRACT_16BITS(&sllp->sll_pkttype)));
59
60 /*
61 * XXX - check the link-layer address type value?
62 * For now, we just assume 6 means Ethernet.
63 * XXX - print others as strings of hex?
64 */
65 if (EXTRACT_16BITS(&sllp->sll_halen) == 6)
66 (void)printf("%s ", etheraddr_string(sllp->sll_addr));
67
68 if (!qflag) {
69 ether_type = EXTRACT_16BITS(&sllp->sll_protocol);
70
71 if (ether_type <= ETHERMTU) {
72 /*
73 * Not an Ethernet type; what type is it?
74 */
75 switch (ether_type) {
76
77 case LINUX_SLL_P_802_3:
78 /*
79 * Ethernet_802.3 IPX frame.
80 */
81 (void)printf("802.3");
82 break;
83
84 case LINUX_SLL_P_802_2:
85 /*
86 * 802.2.
87 */
88 (void)printf("802.3");
89 break;
90
91 default:
92 /*
93 * What is it?
94 */
95 (void)printf("ethertype Unknown (0x%04x)",
96 ether_type);
97 break;
98 }
99 } else {
100 (void)printf("ethertype %s (0x%04x)",
101 tok2str(ethertype_values, "Unknown", ether_type),
102 ether_type);
103 }
104 (void)printf(", length %u: ", length);
105 }
106 }
107
108 /*
109 * This is the top level routine of the printer. 'p' points to the
110 * Linux "cooked capture" header of the packet, 'h->ts' is the timestamp,
111 * 'h->len' is the length of the packet off the wire, and 'h->caplen'
112 * is the number of bytes actually captured.
113 */
114 u_int
sll_if_print(const struct pcap_pkthdr * h,const u_char * p)115 sll_if_print(const struct pcap_pkthdr *h, const u_char *p)
116 {
117 u_int caplen = h->caplen;
118 u_int length = h->len;
119 register const struct sll_header *sllp;
120 u_short ether_type;
121 u_short extracted_ethertype;
122
123 if (caplen < SLL_HDR_LEN) {
124 /*
125 * XXX - this "can't happen" because "pcap-linux.c" always
126 * adds this many bytes of header to every packet in a
127 * cooked socket capture.
128 */
129 printf("[|sll]");
130 return (caplen);
131 }
132
133 sllp = (const struct sll_header *)p;
134
135 if (eflag)
136 sll_print(sllp, length);
137
138 /*
139 * Go past the cooked-mode header.
140 */
141 length -= SLL_HDR_LEN;
142 caplen -= SLL_HDR_LEN;
143 p += SLL_HDR_LEN;
144
145 ether_type = ntohs(sllp->sll_protocol);
146
147 /*
148 * Is it (gag) an 802.3 encapsulation, or some non-Ethernet
149 * packet type?
150 */
151 if (ether_type <= ETHERMTU) {
152 /*
153 * Yes - what type is it?
154 */
155 switch (ether_type) {
156
157 case LINUX_SLL_P_802_3:
158 /*
159 * Ethernet_802.3 IPX frame.
160 */
161 ipx_print(p, length);
162 break;
163
164 case LINUX_SLL_P_802_2:
165 /*
166 * 802.2.
167 * Try to print the LLC-layer header & higher layers.
168 */
169 if (llc_print(p, length, caplen, NULL, NULL,
170 &extracted_ethertype) == 0)
171 goto unknown; /* unknown LLC type */
172 break;
173
174 default:
175 extracted_ethertype = 0;
176 /*FALLTHROUGH*/
177
178 unknown:
179 /* ether_type not known, print raw packet */
180 if (!eflag)
181 sll_print(sllp, length + SLL_HDR_LEN);
182 if (extracted_ethertype) {
183 printf("(LLC %s) ",
184 etherproto_string(htons(extracted_ethertype)));
185 }
186 if (!suppress_default_print)
187 default_print(p, caplen);
188 break;
189 }
190 } else if (ether_encap_print(ether_type, p, length, caplen,
191 &extracted_ethertype) == 0) {
192 /* ether_type not known, print raw packet */
193 if (!eflag)
194 sll_print(sllp, length + SLL_HDR_LEN);
195 if (!suppress_default_print)
196 default_print(p, caplen);
197 }
198
199 return (SLL_HDR_LEN);
200 }
201