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