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1 /*
2  * Marko Kiiskila carnil@cs.tut.fi
3  *
4  * Tampere University of Technology - Telecommunications Laboratory
5  *
6  * Permission to use, copy, modify and distribute this
7  * software and its documentation is hereby granted,
8  * provided that both the copyright notice and this
9  * permission notice appear in all copies of the software,
10  * derivative works or modified versions, and any portions
11  * thereof, that both notices appear in supporting
12  * documentation, and that the use of this software is
13  * acknowledged in any publications resulting from using
14  * the software.
15  *
16  * TUT ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
17  * CONDITION AND DISCLAIMS ANY LIABILITY OF ANY KIND FOR
18  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS
19  * SOFTWARE.
20  *
21  */
22 
23 #ifndef lint
24 static const char rcsid[] _U_ =
25     "@(#) $Header: /tcpdump/master/tcpdump/print-lane.c,v 1.23.2.2 2005/11/13 12:12:59 guy Exp $ (LBL)";
26 #endif
27 
28 #ifdef HAVE_CONFIG_H
29 #include "config.h"
30 #endif
31 
32 #include <tcpdump-stdinc.h>
33 
34 #include <stdio.h>
35 #include <pcap.h>
36 
37 #include "interface.h"
38 #include "addrtoname.h"
39 #include "extract.h"
40 #include "ether.h"
41 #include "lane.h"
42 
43 static const struct tok lecop2str[] = {
44 	{ 0x0001,	"configure request" },
45 	{ 0x0101,	"configure response" },
46 	{ 0x0002,	"join request" },
47 	{ 0x0102,	"join response" },
48 	{ 0x0003,	"ready query" },
49 	{ 0x0103,	"ready indication" },
50 	{ 0x0004,	"register request" },
51 	{ 0x0104,	"register response" },
52 	{ 0x0005,	"unregister request" },
53 	{ 0x0105,	"unregister response" },
54 	{ 0x0006,	"ARP request" },
55 	{ 0x0106,	"ARP response" },
56 	{ 0x0007,	"flush request" },
57 	{ 0x0107,	"flush response" },
58 	{ 0x0008,	"NARP request" },
59 	{ 0x0009,	"topology request" },
60 	{ 0,		NULL }
61 };
62 
63 static inline void
lane_hdr_print(register const u_char * bp,int length)64 lane_hdr_print(register const u_char *bp, int length)
65 {
66 	register const struct lecdatahdr_8023 *ep;
67 
68 	ep = (const struct lecdatahdr_8023 *)bp;
69 	if (qflag)
70 		(void)printf("lecid:%x %s %s %d: ",
71 			     EXTRACT_16BITS(&ep->le_header),
72 			     etheraddr_string(ep->h_source),
73 			     etheraddr_string(ep->h_dest),
74 			     length);
75 	else
76 		(void)printf("lecid:%x %s %s %s %d: ",
77 			     EXTRACT_16BITS(&ep->le_header),
78 			     etheraddr_string(ep->h_source),
79 			     etheraddr_string(ep->h_dest),
80 			     etherproto_string(ep->h_type),
81 			     length);
82 }
83 
84 /*
85  * This is the top level routine of the printer.  'p' points
86  * to the LANE header of the packet, 'h->ts' is the timestamp,
87  * 'h->len' is the length of the packet off the wire, and 'h->caplen'
88  * is the number of bytes actually captured.
89  *
90  * This assumes 802.3, not 802.5, LAN emulation.
91  */
92 void
lane_print(const u_char * p,u_int length,u_int caplen)93 lane_print(const u_char *p, u_int length, u_int caplen)
94 {
95 	struct lane_controlhdr *lec;
96 	struct lecdatahdr_8023 *ep;
97 	u_short ether_type;
98 	u_short extracted_ethertype;
99 
100 	if (caplen < sizeof(struct lane_controlhdr)) {
101 		printf("[|lane]");
102 		return;
103 	}
104 
105 	lec = (struct lane_controlhdr *)p;
106 	if (EXTRACT_16BITS(&lec->lec_header) == 0xff00) {
107 		/*
108 		 * LE Control.
109 		 */
110 		printf("lec: proto %x vers %x %s",
111 		    lec->lec_proto, lec->lec_vers,
112 		    tok2str(lecop2str, "opcode-#%u", EXTRACT_16BITS(&lec->lec_opcode)));
113 		return;
114 	}
115 
116 	if (caplen < sizeof(struct lecdatahdr_8023)) {
117 		printf("[|lane]");
118 		return;
119 	}
120 
121 	if (eflag)
122 		lane_hdr_print(p, length);
123 
124 	/*
125 	 * Go past the LANE header.
126 	 */
127 	length -= sizeof(struct lecdatahdr_8023);
128 	caplen -= sizeof(struct lecdatahdr_8023);
129 	ep = (struct lecdatahdr_8023 *)p;
130 	p += sizeof(struct lecdatahdr_8023);
131 
132 	ether_type = EXTRACT_16BITS(&ep->h_type);
133 
134 	/*
135 	 * Is it (gag) an 802.3 encapsulation?
136 	 */
137 	if (ether_type <= ETHERMTU) {
138 		/* Try to print the LLC-layer header & higher layers */
139 		if (llc_print(p, length, caplen, ep->h_source, ep->h_dest,
140 		    &extracted_ethertype) == 0) {
141 			/* ether_type not known, print raw packet */
142 			if (!eflag)
143 				lane_hdr_print((u_char *)ep, length + sizeof(*ep));
144 			if (extracted_ethertype) {
145 				printf("(LLC %s) ",
146 			       etherproto_string(htons(extracted_ethertype)));
147 			}
148 			if (!suppress_default_print)
149 				default_print(p, caplen);
150 		}
151 	} else if (ether_encap_print(ether_type, p, length, caplen,
152 	    &extracted_ethertype) == 0) {
153 		/* ether_type not known, print raw packet */
154 		if (!eflag)
155 			lane_hdr_print((u_char *)ep, length + sizeof(*ep));
156 		if (!suppress_default_print)
157 			default_print(p, caplen);
158 	}
159 }
160 
161 u_int
lane_if_print(const struct pcap_pkthdr * h,const u_char * p)162 lane_if_print(const struct pcap_pkthdr *h, const u_char *p)
163 {
164 	lane_print(p, h->len, h->caplen);
165 
166 	return (sizeof(struct lecdatahdr_8023));
167 }
168