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 #include <sys/cdefs.h>
25 #ifndef lint
26 __RCSID("$NetBSD: print-igrp.c,v 1.9 2024/09/02 16:15:31 christos Exp $");
27 #endif
28
29 /* \summary: Interior Gateway Routing Protocol (IGRP) printer */
30
31 #include <config.h>
32
33 #include "netdissect-stdinc.h"
34
35 #include "netdissect.h"
36 #include "extract.h"
37
38 /* Cisco IGRP definitions */
39
40 /* IGRP Header */
41
42 struct igrphdr {
43 nd_uint8_t ig_vop; /* protocol version number / opcode */
44 #define IGRP_V(x) (((x) & 0xf0) >> 4)
45 #define IGRP_OP(x) ((x) & 0x0f)
46 nd_uint8_t ig_ed; /* edition number */
47 nd_uint16_t ig_as; /* autonomous system number */
48 nd_uint16_t ig_ni; /* number of subnet in local net */
49 nd_uint16_t ig_ns; /* number of networks in AS */
50 nd_uint16_t ig_nx; /* number of networks outside AS */
51 nd_uint16_t ig_sum; /* checksum of IGRP header & data */
52 };
53
54 #define IGRP_UPDATE 1
55 #define IGRP_REQUEST 2
56
57 /* IGRP routing entry */
58
59 struct igrprte {
60 nd_byte igr_net[3]; /* 3 significant octets of IP address */
61 nd_uint24_t igr_dly; /* delay in tens of microseconds */
62 nd_uint24_t igr_bw; /* bandwidth in units of 1 kb/s */
63 nd_uint16_t igr_mtu; /* MTU in octets */
64 nd_uint8_t igr_rel; /* percent packets successfully tx/rx */
65 nd_uint8_t igr_ld; /* percent of channel occupied */
66 nd_uint8_t igr_hct; /* hop count */
67 };
68
69 #define IGRP_RTE_SIZE 14 /* sizeof() is accurate now */
70
71 static void
igrp_entry_print(netdissect_options * ndo,const struct igrprte * igr)72 igrp_entry_print(netdissect_options *ndo, const struct igrprte *igr)
73 {
74 u_int delay, bandwidth;
75 u_int metric, mtu;
76
77 delay = GET_BE_U_3(igr->igr_dly);
78 bandwidth = GET_BE_U_3(igr->igr_bw);
79 metric = ND_MIN(bandwidth + delay, 0xffffff);
80 mtu = GET_BE_U_2(igr->igr_mtu);
81
82 ND_PRINT(" d=%u b=%u r=%u l=%u M=%u mtu=%u in %u hops",
83 10 * delay, bandwidth == 0 ? 0 : 10000000 / bandwidth,
84 GET_U_1(igr->igr_rel), GET_U_1(igr->igr_ld), metric,
85 mtu, GET_U_1(igr->igr_hct));
86 }
87
88 static const struct tok op2str[] = {
89 { IGRP_UPDATE, "update" },
90 { IGRP_REQUEST, "request" },
91 { 0, NULL }
92 };
93
94 void
igrp_print(netdissect_options * ndo,const u_char * bp,u_int length)95 igrp_print(netdissect_options *ndo, const u_char *bp, u_int length)
96 {
97 const struct igrphdr *hdr;
98 const u_char *cp;
99 u_int nint, nsys, next;
100 uint16_t cksum;
101
102 ndo->ndo_protocol = "igrp";
103 hdr = (const struct igrphdr *)bp;
104 cp = (const u_char *)(hdr + 1);
105 ND_PRINT("igrp:");
106
107 /* Header */
108 nint = GET_BE_U_2(hdr->ig_ni);
109 nsys = GET_BE_U_2(hdr->ig_ns);
110 next = GET_BE_U_2(hdr->ig_nx);
111
112 ND_PRINT(" %s V%u edit=%u AS=%u (%u/%u/%u)",
113 tok2str(op2str, "op-#%u", IGRP_OP(GET_U_1(hdr->ig_vop))),
114 IGRP_V(GET_U_1(hdr->ig_vop)),
115 GET_U_1(hdr->ig_ed),
116 GET_BE_U_2(hdr->ig_as),
117 nint,
118 nsys,
119 next);
120 cksum = GET_BE_U_2(hdr->ig_sum);
121 if (ndo->ndo_vflag)
122 ND_PRINT(" checksum=0x%04x", cksum);
123
124 length -= sizeof(*hdr);
125 while (length >= IGRP_RTE_SIZE) {
126 const struct igrprte *igr = (const struct igrprte *)cp;
127 uint8_t net0 = GET_U_1(&igr->igr_net[0]);
128 uint8_t net1 = GET_U_1(&igr->igr_net[1]);
129 uint8_t net2 = GET_U_1(&igr->igr_net[2]);
130
131 if (nint > 0) {
132 ND_PRINT(" *.%u.%u.%u", net0, net1, net2);
133 igrp_entry_print(ndo, igr);
134 --nint;
135 } else if (nsys > 0) {
136 ND_PRINT(" %u.%u.%u.0", net0, net1, net2);
137 igrp_entry_print(ndo, igr);
138 --nsys;
139 } else if (next > 0) {
140 ND_PRINT(" X%u.%u.%u.0", net0, net1, net2);
141 igrp_entry_print(ndo, igr);
142 --next;
143 } else {
144 ND_PRINT(" [extra bytes %u]", length);
145 break;
146 }
147 cp += IGRP_RTE_SIZE;
148 length -= IGRP_RTE_SIZE;
149 }
150 if (nint || nsys || next || length)
151 nd_print_invalid(ndo);
152 }
153