1 /* 2 * Copyright (c) 1998-2006 The TCPDUMP project 3 * 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. 14 * 15 * Original code by Carles Kishimoto <Carles.Kishimoto@bsc.es> 16 */ 17 18 /* \summary: Cisco VLAN Query Protocol (VQP) printer */ 19 20 #include <sys/cdefs.h> 21 #ifndef lint 22 __RCSID("$NetBSD: print-vqp.c,v 1.8 2023/08/17 20:19:40 christos Exp $"); 23 #endif 24 25 #ifdef HAVE_CONFIG_H 26 #include <config.h> 27 #endif 28 29 #include "netdissect-stdinc.h" 30 31 #define ND_LONGJMP_FROM_TCHECK 32 #include "netdissect.h" 33 #include "extract.h" 34 #include "addrtoname.h" 35 36 #define VQP_VERSION 1 37 38 /* 39 * VQP common header 40 * 41 * 0 1 2 3 42 * 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 43 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 44 * | Constant | Packet type | Error Code | nitems | 45 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 46 * | Packet Sequence Number (4 bytes) | 47 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 48 */ 49 50 struct vqp_common_header_t { 51 nd_uint8_t version; 52 nd_uint8_t msg_type; 53 nd_uint8_t error_code; 54 nd_uint8_t nitems; 55 nd_uint32_t sequence; 56 }; 57 58 struct vqp_obj_tlv_t { 59 nd_uint32_t obj_type; 60 nd_uint16_t obj_length; 61 }; 62 63 #define VQP_OBJ_REQ_JOIN_PORT 0x01 64 #define VQP_OBJ_RESP_VLAN 0x02 65 #define VQP_OBJ_REQ_RECONFIRM 0x03 66 #define VQP_OBJ_RESP_RECONFIRM 0x04 67 68 static const struct tok vqp_msg_type_values[] = { 69 { VQP_OBJ_REQ_JOIN_PORT, "Request, Join Port"}, 70 { VQP_OBJ_RESP_VLAN, "Response, VLAN"}, 71 { VQP_OBJ_REQ_RECONFIRM, "Request, Reconfirm"}, 72 { VQP_OBJ_RESP_RECONFIRM, "Response, Reconfirm"}, 73 { 0, NULL} 74 }; 75 76 static const struct tok vqp_error_code_values[] = { 77 { 0x00, "No error"}, 78 { 0x03, "Access denied"}, 79 { 0x04, "Shutdown port"}, 80 { 0x05, "Wrong VTP domain"}, 81 { 0, NULL} 82 }; 83 84 /* FIXME the heading 0x0c looks ugly - those must be flags etc. */ 85 #define VQP_OBJ_IP_ADDRESS 0x0c01 86 #define VQP_OBJ_PORT_NAME 0x0c02 87 #define VQP_OBJ_VLAN_NAME 0x0c03 88 #define VQP_OBJ_VTP_DOMAIN 0x0c04 89 #define VQP_OBJ_ETHERNET_PKT 0x0c05 90 #define VQP_OBJ_MAC_NULL 0x0c06 91 #define VQP_OBJ_MAC_ADDRESS 0x0c08 92 93 static const struct tok vqp_obj_values[] = { 94 { VQP_OBJ_IP_ADDRESS, "Client IP Address" }, 95 { VQP_OBJ_PORT_NAME, "Port Name" }, 96 { VQP_OBJ_VLAN_NAME, "VLAN Name" }, 97 { VQP_OBJ_VTP_DOMAIN, "VTP Domain" }, 98 { VQP_OBJ_ETHERNET_PKT, "Ethernet Packet" }, 99 { VQP_OBJ_MAC_NULL, "MAC Null" }, 100 { VQP_OBJ_MAC_ADDRESS, "MAC Address" }, 101 { 0, NULL} 102 }; 103 104 void 105 vqp_print(netdissect_options *ndo, const u_char *pptr, u_int len) 106 { 107 const struct vqp_common_header_t *vqp_common_header; 108 const struct vqp_obj_tlv_t *vqp_obj_tlv; 109 110 const u_char *tptr; 111 uint8_t version; 112 uint16_t vqp_obj_len; 113 uint32_t vqp_obj_type; 114 u_int tlen; 115 uint8_t nitems; 116 117 ndo->ndo_protocol = "vqp"; 118 tptr=pptr; 119 tlen = len; 120 vqp_common_header = (const struct vqp_common_header_t *)pptr; 121 ND_TCHECK_SIZE(vqp_common_header); 122 if (sizeof(struct vqp_common_header_t) > tlen) 123 goto invalid; 124 version = GET_U_1(vqp_common_header->version); 125 126 /* 127 * Sanity checking of the header. 128 */ 129 if (version != VQP_VERSION) { 130 ND_PRINT("VQP version %u packet not supported", 131 version); 132 return; 133 } 134 135 /* in non-verbose mode just lets print the basic Message Type */ 136 if (ndo->ndo_vflag < 1) { 137 ND_PRINT("VQPv%u %s Message, error-code %s (%u), length %u", 138 version, 139 tok2str(vqp_msg_type_values, "unknown (%u)",GET_U_1(vqp_common_header->msg_type)), 140 tok2str(vqp_error_code_values, "unknown", GET_U_1(vqp_common_header->error_code)), 141 GET_U_1(vqp_common_header->error_code), 142 len); 143 return; 144 } 145 146 /* ok they seem to want to know everything - lets fully decode it */ 147 nitems = GET_U_1(vqp_common_header->nitems); 148 ND_PRINT("\n\tVQPv%u, %s Message, error-code %s (%u), seq 0x%08x, items %u, length %u", 149 version, 150 tok2str(vqp_msg_type_values, "unknown (%u)",GET_U_1(vqp_common_header->msg_type)), 151 tok2str(vqp_error_code_values, "unknown", GET_U_1(vqp_common_header->error_code)), 152 GET_U_1(vqp_common_header->error_code), 153 GET_BE_U_4(vqp_common_header->sequence), 154 nitems, 155 len); 156 157 /* skip VQP Common header */ 158 tptr+=sizeof(struct vqp_common_header_t); 159 tlen-=sizeof(struct vqp_common_header_t); 160 161 while (nitems != 0 && tlen != 0) { 162 163 vqp_obj_tlv = (const struct vqp_obj_tlv_t *)tptr; 164 ND_TCHECK_SIZE(vqp_obj_tlv); 165 if (sizeof(struct vqp_obj_tlv_t) > tlen) 166 goto invalid; 167 vqp_obj_type = GET_BE_U_4(vqp_obj_tlv->obj_type); 168 vqp_obj_len = GET_BE_U_2(vqp_obj_tlv->obj_length); 169 tptr+=sizeof(struct vqp_obj_tlv_t); 170 tlen-=sizeof(struct vqp_obj_tlv_t); 171 172 ND_PRINT("\n\t %s Object (0x%08x), length %u, value: ", 173 tok2str(vqp_obj_values, "Unknown", vqp_obj_type), 174 vqp_obj_type, vqp_obj_len); 175 176 /* basic sanity check */ 177 if (vqp_obj_type == 0 || vqp_obj_len ==0) { 178 return; 179 } 180 181 /* did we capture enough for fully decoding the object ? */ 182 ND_TCHECK_LEN(tptr, vqp_obj_len); 183 if (vqp_obj_len > tlen) 184 goto invalid; 185 186 switch(vqp_obj_type) { 187 case VQP_OBJ_IP_ADDRESS: 188 if (vqp_obj_len != 4) 189 goto invalid; 190 ND_PRINT("%s (0x%08x)", GET_IPADDR_STRING(tptr), 191 GET_BE_U_4(tptr)); 192 break; 193 /* those objects have similar semantics - fall through */ 194 case VQP_OBJ_PORT_NAME: 195 case VQP_OBJ_VLAN_NAME: 196 case VQP_OBJ_VTP_DOMAIN: 197 case VQP_OBJ_ETHERNET_PKT: 198 nd_printjnp(ndo, tptr, vqp_obj_len); 199 break; 200 /* those objects have similar semantics - fall through */ 201 case VQP_OBJ_MAC_ADDRESS: 202 case VQP_OBJ_MAC_NULL: 203 if (vqp_obj_len != MAC_ADDR_LEN) 204 goto invalid; 205 ND_PRINT("%s", GET_ETHERADDR_STRING(tptr)); 206 break; 207 default: 208 if (ndo->ndo_vflag <= 1) 209 print_unknown_data(ndo,tptr, "\n\t ", vqp_obj_len); 210 break; 211 } 212 tptr += vqp_obj_len; 213 tlen -= vqp_obj_len; 214 nitems--; 215 } 216 return; 217 invalid: 218 nd_print_invalid(ndo); 219 } 220