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 1.9 2024/09/02 16:15:33 christos Exp $"); 23 #endif 24 25 #include <config.h> 26 27 #include "netdissect-stdinc.h" 28 29 #define ND_LONGJMP_FROM_TCHECK 30 #include "netdissect.h" 31 #include "extract.h" 32 #include "addrtoname.h" 33 34 #define VQP_VERSION 1 35 36 /* 37 * VQP common header 38 * 39 * 0 1 2 3 40 * 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 41 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 42 * | Constant | Packet type | Error Code | nitems | 43 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 44 * | Packet Sequence Number (4 bytes) | 45 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 46 */ 47 48 struct vqp_common_header_t { 49 nd_uint8_t version; 50 nd_uint8_t msg_type; 51 nd_uint8_t error_code; 52 nd_uint8_t nitems; 53 nd_uint32_t sequence; 54 }; 55 56 struct vqp_obj_tlv_t { 57 nd_uint32_t obj_type; 58 nd_uint16_t obj_length; 59 }; 60 61 #define VQP_OBJ_REQ_JOIN_PORT 0x01 62 #define VQP_OBJ_RESP_VLAN 0x02 63 #define VQP_OBJ_REQ_RECONFIRM 0x03 64 #define VQP_OBJ_RESP_RECONFIRM 0x04 65 66 static const struct tok vqp_msg_type_values[] = { 67 { VQP_OBJ_REQ_JOIN_PORT, "Request, Join Port"}, 68 { VQP_OBJ_RESP_VLAN, "Response, VLAN"}, 69 { VQP_OBJ_REQ_RECONFIRM, "Request, Reconfirm"}, 70 { VQP_OBJ_RESP_RECONFIRM, "Response, Reconfirm"}, 71 { 0, NULL} 72 }; 73 74 static const struct tok vqp_error_code_values[] = { 75 { 0x00, "No error"}, 76 { 0x03, "Access denied"}, 77 { 0x04, "Shutdown port"}, 78 { 0x05, "Wrong VTP domain"}, 79 { 0, NULL} 80 }; 81 82 /* FIXME the heading 0x0c looks ugly - those must be flags etc. */ 83 #define VQP_OBJ_IP_ADDRESS 0x0c01 84 #define VQP_OBJ_PORT_NAME 0x0c02 85 #define VQP_OBJ_VLAN_NAME 0x0c03 86 #define VQP_OBJ_VTP_DOMAIN 0x0c04 87 #define VQP_OBJ_ETHERNET_PKT 0x0c05 88 #define VQP_OBJ_MAC_NULL 0x0c06 89 #define VQP_OBJ_MAC_ADDRESS 0x0c08 90 91 static const struct tok vqp_obj_values[] = { 92 { VQP_OBJ_IP_ADDRESS, "Client IP Address" }, 93 { VQP_OBJ_PORT_NAME, "Port Name" }, 94 { VQP_OBJ_VLAN_NAME, "VLAN Name" }, 95 { VQP_OBJ_VTP_DOMAIN, "VTP Domain" }, 96 { VQP_OBJ_ETHERNET_PKT, "Ethernet Packet" }, 97 { VQP_OBJ_MAC_NULL, "MAC Null" }, 98 { VQP_OBJ_MAC_ADDRESS, "MAC Address" }, 99 { 0, NULL} 100 }; 101 102 void 103 vqp_print(netdissect_options *ndo, const u_char *pptr, u_int len) 104 { 105 const struct vqp_common_header_t *vqp_common_header; 106 const struct vqp_obj_tlv_t *vqp_obj_tlv; 107 108 const u_char *tptr; 109 uint8_t version; 110 uint16_t vqp_obj_len; 111 uint32_t vqp_obj_type; 112 u_int tlen; 113 uint8_t nitems; 114 115 ndo->ndo_protocol = "vqp"; 116 tptr=pptr; 117 tlen = len; 118 vqp_common_header = (const struct vqp_common_header_t *)pptr; 119 ND_TCHECK_SIZE(vqp_common_header); 120 if (sizeof(struct vqp_common_header_t) > tlen) 121 goto invalid; 122 version = GET_U_1(vqp_common_header->version); 123 124 /* 125 * Sanity checking of the header. 126 */ 127 if (version != VQP_VERSION) { 128 ND_PRINT("VQP version %u packet not supported", 129 version); 130 return; 131 } 132 133 /* in non-verbose mode just lets print the basic Message Type */ 134 if (ndo->ndo_vflag < 1) { 135 ND_PRINT("VQPv%u %s Message, error-code %s (%u), length %u", 136 version, 137 tok2str(vqp_msg_type_values, "unknown (%u)",GET_U_1(vqp_common_header->msg_type)), 138 tok2str(vqp_error_code_values, "unknown", GET_U_1(vqp_common_header->error_code)), 139 GET_U_1(vqp_common_header->error_code), 140 len); 141 return; 142 } 143 144 /* ok they seem to want to know everything - lets fully decode it */ 145 nitems = GET_U_1(vqp_common_header->nitems); 146 ND_PRINT("\n\tVQPv%u, %s Message, error-code %s (%u), seq 0x%08x, items %u, length %u", 147 version, 148 tok2str(vqp_msg_type_values, "unknown (%u)",GET_U_1(vqp_common_header->msg_type)), 149 tok2str(vqp_error_code_values, "unknown", GET_U_1(vqp_common_header->error_code)), 150 GET_U_1(vqp_common_header->error_code), 151 GET_BE_U_4(vqp_common_header->sequence), 152 nitems, 153 len); 154 155 /* skip VQP Common header */ 156 tptr+=sizeof(struct vqp_common_header_t); 157 tlen-=sizeof(struct vqp_common_header_t); 158 159 while (nitems != 0 && tlen != 0) { 160 161 vqp_obj_tlv = (const struct vqp_obj_tlv_t *)tptr; 162 ND_TCHECK_SIZE(vqp_obj_tlv); 163 if (sizeof(struct vqp_obj_tlv_t) > tlen) 164 goto invalid; 165 vqp_obj_type = GET_BE_U_4(vqp_obj_tlv->obj_type); 166 vqp_obj_len = GET_BE_U_2(vqp_obj_tlv->obj_length); 167 tptr+=sizeof(struct vqp_obj_tlv_t); 168 tlen-=sizeof(struct vqp_obj_tlv_t); 169 170 ND_PRINT("\n\t %s Object (0x%08x), length %u, value: ", 171 tok2str(vqp_obj_values, "Unknown", vqp_obj_type), 172 vqp_obj_type, vqp_obj_len); 173 174 /* basic sanity check */ 175 if (vqp_obj_type == 0 || vqp_obj_len ==0) { 176 return; 177 } 178 179 /* did we capture enough for fully decoding the object ? */ 180 ND_TCHECK_LEN(tptr, vqp_obj_len); 181 if (vqp_obj_len > tlen) 182 goto invalid; 183 184 switch(vqp_obj_type) { 185 case VQP_OBJ_IP_ADDRESS: 186 if (vqp_obj_len != 4) 187 goto invalid; 188 ND_PRINT("%s (0x%08x)", GET_IPADDR_STRING(tptr), 189 GET_BE_U_4(tptr)); 190 break; 191 /* those objects have similar semantics - fall through */ 192 case VQP_OBJ_PORT_NAME: 193 case VQP_OBJ_VLAN_NAME: 194 case VQP_OBJ_VTP_DOMAIN: 195 case VQP_OBJ_ETHERNET_PKT: 196 nd_printjnp(ndo, tptr, vqp_obj_len); 197 break; 198 /* those objects have similar semantics - fall through */ 199 case VQP_OBJ_MAC_ADDRESS: 200 case VQP_OBJ_MAC_NULL: 201 if (vqp_obj_len != MAC_ADDR_LEN) 202 goto invalid; 203 ND_PRINT("%s", GET_ETHERADDR_STRING(tptr)); 204 break; 205 default: 206 if (ndo->ndo_vflag <= 1) 207 print_unknown_data(ndo,tptr, "\n\t ", vqp_obj_len); 208 break; 209 } 210 tptr += vqp_obj_len; 211 tlen -= vqp_obj_len; 212 nitems--; 213 } 214 return; 215 invalid: 216 nd_print_invalid(ndo); 217 } 218