1 /*
2 * Copyright (c) 1990, 1991, 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
22 /* \summary: Broadcom LI Printer */
23
24 #ifdef HAVE_CONFIG_H
25 #include <config.h>
26 #endif
27
28 #include "netdissect-stdinc.h"
29
30 #define ND_LONGJMP_FROM_TCHECK
31 #include "netdissect.h"
32 #include "addrtoname.h"
33 #include "extract.h"
34
35 #define BCM_LI_SHIM_LEN 4
36
37 static const struct tok bcm_li_direction_values[] = {
38 { 1, "unused" },
39 { 2, "egress" },
40 { 3, "ingress" },
41 { 0, NULL}
42 };
43
44 #define BCM_LI_PKT_TYPE_UNDECIDED 4
45 #define BCM_LI_PKT_TYPE_IPV4 5
46 #define BCM_LI_PKT_TYPE_IPV6 6
47 #define BCM_LI_PKT_TYPE_ETHERNET 7
48
49 static const struct tok bcm_li_pkt_type_values[] = {
50 { BCM_LI_PKT_TYPE_UNDECIDED, "undecided" },
51 { BCM_LI_PKT_TYPE_IPV4, "ipv4" },
52 { BCM_LI_PKT_TYPE_IPV6, "ipv6" },
53 { BCM_LI_PKT_TYPE_ETHERNET, "ethernet" },
54 { 0, NULL}
55 };
56
57 static const struct tok bcm_li_pkt_subtype_values[] = {
58 { 1, "single VLAN tag" },
59 { 2, "double VLAN tag" },
60 { 3, "untagged" },
61 { 0, NULL}
62 };
63
64 void
bcm_li_print(netdissect_options * ndo,const u_char * bp,u_int length)65 bcm_li_print(netdissect_options *ndo,
66 const u_char *bp, u_int length)
67 {
68 u_int shim, direction, pkt_type, pkt_subtype, li_id;
69
70 ndo->ndo_protocol = "bcm_li";
71 if (length < BCM_LI_SHIM_LEN) {
72 ND_PRINT(" (length %u < %u)", length, BCM_LI_SHIM_LEN);
73 goto invalid;
74 }
75 shim = GET_BE_U_4(bp);
76
77 direction = (shim >> 29) & 0x7;
78 pkt_type = (shim >> 25) & 0xf;
79 pkt_subtype = (shim >> 22) & 0x7;
80 li_id = shim & 0x3fffff;
81
82 length -= BCM_LI_SHIM_LEN;
83 bp += BCM_LI_SHIM_LEN;
84
85 ND_PRINT("%sBCM-LI-SHIM: direction %s, pkt-type %s, pkt-subtype %s, li-id %u%s",
86 ndo->ndo_vflag ? "\n " : "",
87 tok2str(bcm_li_direction_values, "unknown", direction),
88 tok2str(bcm_li_pkt_type_values, "unknown", pkt_type),
89 tok2str(bcm_li_pkt_subtype_values, "unknown", pkt_subtype),
90 li_id,
91 ndo->ndo_vflag ? "\n ": "");
92
93 if (!ndo->ndo_vflag) {
94 ND_TCHECK_LEN(bp, length);
95 return;
96 }
97
98 switch (pkt_type) {
99 case BCM_LI_PKT_TYPE_ETHERNET:
100 ether_print(ndo, bp, length, ND_BYTES_AVAILABLE_AFTER(bp), NULL, NULL);
101 break;
102 case BCM_LI_PKT_TYPE_IPV4:
103 ip_print(ndo, bp, length);
104 break;
105 case BCM_LI_PKT_TYPE_IPV6:
106 ip6_print(ndo, bp, length);
107 break;
108 case BCM_LI_PKT_TYPE_UNDECIDED:
109
110 /*
111 * Guess IP version from first nibble.
112 */
113 if ((GET_U_1(bp) >> 4) == 4) {
114 ip_print(ndo, bp, length);
115 } else if ((GET_U_1(bp) >> 4) == 6) {
116 ip6_print(ndo, bp, length);
117 } else {
118 ND_PRINT("unknown payload");
119 }
120 break;
121
122 default:
123 goto invalid;
124 }
125
126 return;
127 invalid:
128 nd_print_invalid(ndo);
129 }
130
131