1/*
2 * Copyright (c) 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 * Initial contribution from Francis Dupont (francis.dupont@inria.fr)
22 */
23
24/* \summary: Interior Gateway Routing Protocol (IGRP) printer */
25
26#ifdef HAVE_CONFIG_H
27#include "config.h"
28#endif
29
30#include <netdissect-stdinc.h>
31
32#include "netdissect.h"
33#include "extract.h"
34
35/* Cisco IGRP definitions */
36
37/* IGRP Header */
38
39struct igrphdr {
40	uint8_t ig_vop;	/* protocol version number / opcode */
41#define IGRP_V(x)	(((x) & 0xf0) >> 4)
42#define IGRP_OP(x)	((x) & 0x0f)
43	uint8_t ig_ed;		/* edition number */
44	uint16_t ig_as;	/* autonomous system number */
45	uint16_t ig_ni;	/* number of subnet in local net */
46	uint16_t ig_ns;	/* number of networks in AS */
47	uint16_t ig_nx;	/* number of networks ouside AS */
48	uint16_t ig_sum;	/* checksum of IGRP header & data */
49};
50
51#define IGRP_UPDATE	1
52#define IGRP_REQUEST	2
53
54/* IGRP routing entry */
55
56struct igrprte {
57	uint8_t igr_net[3];	/* 3 significant octets of IP address */
58	uint8_t igr_dly[3];	/* delay in tens of microseconds */
59	uint8_t igr_bw[3];	/* bandwidth in units of 1 kb/s */
60	uint8_t igr_mtu[2];	/* MTU in octets */
61	uint8_t igr_rel;	/* percent packets successfully tx/rx */
62	uint8_t igr_ld;	/* percent of channel occupied */
63	uint8_t igr_hct;	/* hop count */
64};
65
66#define IGRP_RTE_SIZE	14	/* don't believe sizeof ! */
67
68static void
69igrp_entry_print(netdissect_options *ndo, register const struct igrprte *igr,
70    register int is_interior, register int is_exterior)
71{
72	register u_int delay, bandwidth;
73	u_int metric, mtu;
74
75	if (is_interior)
76		ND_PRINT((ndo, " *.%d.%d.%d", igr->igr_net[0],
77		    igr->igr_net[1], igr->igr_net[2]));
78	else if (is_exterior)
79		ND_PRINT((ndo, " X%d.%d.%d.0", igr->igr_net[0],
80		    igr->igr_net[1], igr->igr_net[2]));
81	else
82		ND_PRINT((ndo, " %d.%d.%d.0", igr->igr_net[0],
83		    igr->igr_net[1], igr->igr_net[2]));
84
85	delay = EXTRACT_24BITS(igr->igr_dly);
86	bandwidth = EXTRACT_24BITS(igr->igr_bw);
87	metric = bandwidth + delay;
88	if (metric > 0xffffff)
89		metric = 0xffffff;
90	mtu = EXTRACT_16BITS(igr->igr_mtu);
91
92	ND_PRINT((ndo, " d=%d b=%d r=%d l=%d M=%d mtu=%d in %d hops",
93	    10 * delay, bandwidth == 0 ? 0 : 10000000 / bandwidth,
94	    igr->igr_rel, igr->igr_ld, metric,
95	    mtu, igr->igr_hct));
96}
97
98static const struct tok op2str[] = {
99	{ IGRP_UPDATE,		"update" },
100	{ IGRP_REQUEST,		"request" },
101	{ 0,			NULL }
102};
103
104void
105igrp_print(netdissect_options *ndo, register const u_char *bp, u_int length)
106{
107	register const struct igrphdr *hdr;
108	register const u_char *cp;
109	u_int nint, nsys, next;
110
111	hdr = (const struct igrphdr *)bp;
112	cp = (const u_char *)(hdr + 1);
113	ND_PRINT((ndo, "igrp:"));
114
115	/* Header */
116	ND_TCHECK(*hdr);
117	nint = EXTRACT_16BITS(&hdr->ig_ni);
118	nsys = EXTRACT_16BITS(&hdr->ig_ns);
119	next = EXTRACT_16BITS(&hdr->ig_nx);
120
121	ND_PRINT((ndo, " %s V%d edit=%d AS=%d (%d/%d/%d)",
122	    tok2str(op2str, "op-#%d", IGRP_OP(hdr->ig_vop)),
123	    IGRP_V(hdr->ig_vop),
124	    hdr->ig_ed,
125	    EXTRACT_16BITS(&hdr->ig_as),
126	    nint,
127	    nsys,
128	    next));
129
130	length -= sizeof(*hdr);
131	while (length >= IGRP_RTE_SIZE) {
132		if (nint > 0) {
133			ND_TCHECK2(*cp, IGRP_RTE_SIZE);
134			igrp_entry_print(ndo, (const struct igrprte *)cp, 1, 0);
135			--nint;
136		} else if (nsys > 0) {
137			ND_TCHECK2(*cp, IGRP_RTE_SIZE);
138			igrp_entry_print(ndo, (const struct igrprte *)cp, 0, 0);
139			--nsys;
140		} else if (next > 0) {
141			ND_TCHECK2(*cp, IGRP_RTE_SIZE);
142			igrp_entry_print(ndo, (const struct igrprte *)cp, 0, 1);
143			--next;
144		} else {
145			ND_PRINT((ndo, " [extra bytes %d]", length));
146			break;
147		}
148		cp += IGRP_RTE_SIZE;
149		length -= IGRP_RTE_SIZE;
150	}
151	if (nint == 0 && nsys == 0 && next == 0)
152		return;
153trunc:
154	ND_PRINT((ndo, " [|igrp]"));
155}
156