2 * Copyright (c) 1998-2006 The TCPDUMP project
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that: (1) source code
6 * distributions retain the above copyright notice and this paragraph
7 * in its entirety, and (2) distributions including binary code include
8 * the above copyright notice and this paragraph in its entirety in
9 * the documentation or other materials provided with the distribution.
10 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND
11 * WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, WITHOUT
12 * LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
13 * FOR A PARTICULAR PURPOSE.
15 * Original code by Carles Kishimoto <Carles.Kishimoto@bsc.es>
18 /* \summary: Cisco VLAN Query Protocol (VQP) printer */
24 #include "netdissect-stdinc.h"
26 #define ND_LONGJMP_FROM_TCHECK
27 #include "netdissect.h"
29 #include "addrtoname.h"
37 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
38 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
39 * | Constant | Packet type | Error Code | nitems |
40 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
41 * | Packet Sequence Number (4 bytes) |
42 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
45 struct vqp_common_header_t {
48 nd_uint8_t error_code;
53 struct vqp_obj_tlv_t {
55 nd_uint16_t obj_length;
58 #define VQP_OBJ_REQ_JOIN_PORT 0x01
59 #define VQP_OBJ_RESP_VLAN 0x02
60 #define VQP_OBJ_REQ_RECONFIRM 0x03
61 #define VQP_OBJ_RESP_RECONFIRM 0x04
63 static const struct tok vqp_msg_type_values[] = {
64 { VQP_OBJ_REQ_JOIN_PORT, "Request, Join Port"},
65 { VQP_OBJ_RESP_VLAN, "Response, VLAN"},
66 { VQP_OBJ_REQ_RECONFIRM, "Request, Reconfirm"},
67 { VQP_OBJ_RESP_RECONFIRM, "Response, Reconfirm"},
71 static const struct tok vqp_error_code_values[] = {
73 { 0x03, "Access denied"},
74 { 0x04, "Shutdown port"},
75 { 0x05, "Wrong VTP domain"},
79 /* FIXME the heading 0x0c looks ugly - those must be flags etc. */
80 #define VQP_OBJ_IP_ADDRESS 0x0c01
81 #define VQP_OBJ_PORT_NAME 0x0c02
82 #define VQP_OBJ_VLAN_NAME 0x0c03
83 #define VQP_OBJ_VTP_DOMAIN 0x0c04
84 #define VQP_OBJ_ETHERNET_PKT 0x0c05
85 #define VQP_OBJ_MAC_NULL 0x0c06
86 #define VQP_OBJ_MAC_ADDRESS 0x0c08
88 static const struct tok vqp_obj_values[] = {
89 { VQP_OBJ_IP_ADDRESS, "Client IP Address" },
90 { VQP_OBJ_PORT_NAME, "Port Name" },
91 { VQP_OBJ_VLAN_NAME, "VLAN Name" },
92 { VQP_OBJ_VTP_DOMAIN, "VTP Domain" },
93 { VQP_OBJ_ETHERNET_PKT, "Ethernet Packet" },
94 { VQP_OBJ_MAC_NULL, "MAC Null" },
95 { VQP_OBJ_MAC_ADDRESS, "MAC Address" },
100 vqp_print(netdissect_options *ndo, const u_char *pptr, u_int len)
102 const struct vqp_common_header_t *vqp_common_header;
103 const struct vqp_obj_tlv_t *vqp_obj_tlv;
107 uint16_t vqp_obj_len;
108 uint32_t vqp_obj_type;
112 ndo->ndo_protocol = "vqp";
115 vqp_common_header = (const struct vqp_common_header_t *)pptr;
116 ND_TCHECK_SIZE(vqp_common_header);
117 if (sizeof(struct vqp_common_header_t) > tlen)
119 version = GET_U_1(vqp_common_header->version);
122 * Sanity checking of the header.
124 if (version != VQP_VERSION) {
125 ND_PRINT("VQP version %u packet not supported",
130 /* in non-verbose mode just lets print the basic Message Type */
131 if (ndo->ndo_vflag < 1) {
132 ND_PRINT("VQPv%u %s Message, error-code %s (%u), length %u",
134 tok2str(vqp_msg_type_values, "unknown (%u)",GET_U_1(vqp_common_header->msg_type)),
135 tok2str(vqp_error_code_values, "unknown", GET_U_1(vqp_common_header->error_code)),
136 GET_U_1(vqp_common_header->error_code),
141 /* ok they seem to want to know everything - lets fully decode it */
142 nitems = GET_U_1(vqp_common_header->nitems);
143 ND_PRINT("\n\tVQPv%u, %s Message, error-code %s (%u), seq 0x%08x, items %u, length %u",
145 tok2str(vqp_msg_type_values, "unknown (%u)",GET_U_1(vqp_common_header->msg_type)),
146 tok2str(vqp_error_code_values, "unknown", GET_U_1(vqp_common_header->error_code)),
147 GET_U_1(vqp_common_header->error_code),
148 GET_BE_U_4(vqp_common_header->sequence),
152 /* skip VQP Common header */
153 tptr+=sizeof(struct vqp_common_header_t);
154 tlen-=sizeof(struct vqp_common_header_t);
156 while (nitems != 0 && tlen != 0) {
158 vqp_obj_tlv = (const struct vqp_obj_tlv_t *)tptr;
159 ND_TCHECK_SIZE(vqp_obj_tlv);
160 if (sizeof(struct vqp_obj_tlv_t) > tlen)
162 vqp_obj_type = GET_BE_U_4(vqp_obj_tlv->obj_type);
163 vqp_obj_len = GET_BE_U_2(vqp_obj_tlv->obj_length);
164 tptr+=sizeof(struct vqp_obj_tlv_t);
165 tlen-=sizeof(struct vqp_obj_tlv_t);
167 ND_PRINT("\n\t %s Object (0x%08x), length %u, value: ",
168 tok2str(vqp_obj_values, "Unknown", vqp_obj_type),
169 vqp_obj_type, vqp_obj_len);
171 /* basic sanity check */
172 if (vqp_obj_type == 0 || vqp_obj_len ==0) {
176 /* did we capture enough for fully decoding the object ? */
177 ND_TCHECK_LEN(tptr, vqp_obj_len);
178 if (vqp_obj_len > tlen)
181 switch(vqp_obj_type) {
182 case VQP_OBJ_IP_ADDRESS:
183 if (vqp_obj_len != 4)
185 ND_PRINT("%s (0x%08x)", GET_IPADDR_STRING(tptr),
188 /* those objects have similar semantics - fall through */
189 case VQP_OBJ_PORT_NAME:
190 case VQP_OBJ_VLAN_NAME:
191 case VQP_OBJ_VTP_DOMAIN:
192 case VQP_OBJ_ETHERNET_PKT:
193 nd_printjnp(ndo, tptr, vqp_obj_len);
195 /* those objects have similar semantics - fall through */
196 case VQP_OBJ_MAC_ADDRESS:
197 case VQP_OBJ_MAC_NULL:
198 if (vqp_obj_len != MAC_ADDR_LEN)
200 ND_PRINT("%s", GET_ETHERADDR_STRING(tptr));
203 if (ndo->ndo_vflag <= 1)
204 print_unknown_data(ndo,tptr, "\n\t ", vqp_obj_len);
213 nd_print_invalid(ndo);