| /* |
| * Copyright (c) 1998-2007 The TCPDUMP project |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that: (1) source code |
| * distributions retain the above copyright notice and this paragraph |
| * in its entirety, and (2) distributions including binary code include |
| * the above copyright notice and this paragraph in its entirety in |
| * the documentation or other materials provided with the distribution. |
| * THIS SOFTWARE IS PROVIDED ``AS IS'' AND |
| * WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, WITHOUT |
| * LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS |
| * FOR A PARTICULAR PURPOSE. |
| * |
| * VLAN TRUNKING PROTOCOL (VTP) |
| * |
| * Reference documentation: |
| * http://www.cisco.com/en/US/tech/tk389/tk689/technologies_tech_note09186a0080094c52.shtml |
| * http://www.cisco.com/warp/public/473/21.html |
| * http://www.cisco.com/univercd/cc/td/doc/product/lan/trsrb/frames.htm |
| * |
| * Original code ode by Carles Kishimoto <carles.kishimoto@gmail.com> |
| */ |
| |
| #ifdef HAVE_CONFIG_H |
| #include "config.h" |
| #endif |
| |
| #include <tcpdump-stdinc.h> |
| |
| #include <stdio.h> |
| #include <string.h> |
| |
| #include "interface.h" |
| #include "addrtoname.h" |
| #include "extract.h" |
| #include "nlpid.h" |
| |
| #define VTP_HEADER_LEN 36 |
| #define VTP_DOMAIN_NAME_LEN 32 |
| #define VTP_MD5_DIGEST_LEN 16 |
| #define VTP_UPDATE_TIMESTAMP_LEN 12 |
| #define VTP_VLAN_INFO_OFFSET 12 |
| |
| #define VTP_SUMMARY_ADV 0x01 |
| #define VTP_SUBSET_ADV 0x02 |
| #define VTP_ADV_REQUEST 0x03 |
| #define VTP_JOIN_MESSAGE 0x04 |
| |
| struct vtp_vlan_ { |
| u_int8_t len; |
| u_int8_t status; |
| u_int8_t type; |
| u_int8_t name_len; |
| u_int16_t vlanid; |
| u_int16_t mtu; |
| u_int32_t index; |
| }; |
| |
| static struct tok vtp_message_type_values[] = { |
| { VTP_SUMMARY_ADV, "Summary advertisement"}, |
| { VTP_SUBSET_ADV, "Subset advertisement"}, |
| { VTP_ADV_REQUEST, "Advertisement request"}, |
| { VTP_JOIN_MESSAGE, "Join message"}, |
| { 0, NULL } |
| }; |
| |
| static struct tok vtp_header_values[] = { |
| { 0x01, "Followers"}, /* On Summary advertisement, 3rd byte is Followers */ |
| { 0x02, "Seq number"}, /* On Subset advertisement, 3rd byte is Sequence number */ |
| { 0x03, "Rsvd"}, /* On Adver. requests 3rd byte is Rsvd */ |
| { 0x04, "Rsvd"}, /* On Adver. requests 3rd byte is Rsvd */ |
| { 0, NULL } |
| }; |
| |
| static struct tok vtp_vlan_type_values[] = { |
| { 0x01, "Ethernet"}, |
| { 0x02, "FDDI"}, |
| { 0x03, "TrCRF"}, |
| { 0x04, "FDDI-net"}, |
| { 0x05, "TrBRF"}, |
| { 0, NULL } |
| }; |
| |
| static struct tok vtp_vlan_status[] = { |
| { 0x00, "Operational"}, |
| { 0x01, "Suspended"}, |
| { 0, NULL } |
| }; |
| |
| #define VTP_VLAN_SOURCE_ROUTING_RING_NUMBER 0x01 |
| #define VTP_VLAN_SOURCE_ROUTING_BRIDGE_NUMBER 0x02 |
| #define VTP_VLAN_STP_TYPE 0x03 |
| #define VTP_VLAN_PARENT_VLAN 0x04 |
| #define VTP_VLAN_TRANS_BRIDGED_VLAN 0x05 |
| #define VTP_VLAN_PRUNING 0x06 |
| #define VTP_VLAN_BRIDGE_TYPE 0x07 |
| #define VTP_VLAN_ARP_HOP_COUNT 0x08 |
| #define VTP_VLAN_STE_HOP_COUNT 0x09 |
| #define VTP_VLAN_BACKUP_CRF_MODE 0x0A |
| |
| static struct tok vtp_vlan_tlv_values[] = { |
| { VTP_VLAN_SOURCE_ROUTING_RING_NUMBER, "Source-Routing Ring Number TLV"}, |
| { VTP_VLAN_SOURCE_ROUTING_BRIDGE_NUMBER, "Source-Routing Bridge Number TLV"}, |
| { VTP_VLAN_STP_TYPE, "STP type TLV"}, |
| { VTP_VLAN_PARENT_VLAN, "Parent VLAN TLV"}, |
| { VTP_VLAN_TRANS_BRIDGED_VLAN, "Translationally bridged VLANs TLV"}, |
| { VTP_VLAN_PRUNING, "Pruning TLV"}, |
| { VTP_VLAN_BRIDGE_TYPE, "Bridge Type TLV"}, |
| { VTP_VLAN_ARP_HOP_COUNT, "Max ARP Hop Count TLV"}, |
| { VTP_VLAN_STE_HOP_COUNT, "Max STE Hop Count TLV"}, |
| { VTP_VLAN_BACKUP_CRF_MODE, "Backup CRF Mode TLV"}, |
| { 0, NULL } |
| }; |
| |
| static struct tok vtp_stp_type_values[] = { |
| { 1, "SRT"}, |
| { 2, "SRB"}, |
| { 3, "Auto"}, |
| { 0, NULL } |
| }; |
| |
| void |
| vtp_print (const u_char *pptr, u_int length) |
| { |
| int type, len, tlv_len, tlv_value; |
| const u_char *tptr; |
| const struct vtp_vlan_ *vtp_vlan; |
| |
| if (length < VTP_HEADER_LEN) |
| goto trunc; |
| |
| tptr = pptr; |
| |
| if (!TTEST2(*tptr, VTP_HEADER_LEN)) |
| goto trunc; |
| |
| type = *(tptr+1); |
| printf("VTPv%u, Message %s (0x%02x), length %u", |
| *tptr, |
| tok2str(vtp_message_type_values,"Unknown message type", type), |
| *(tptr+1), |
| length); |
| |
| /* In non-verbose mode, just print version and message type */ |
| if (vflag < 1) { |
| return; |
| } |
| |
| /* verbose mode print all fields */ |
| printf("\n\tDomain name: %s, %s: %u", |
| (tptr+4), |
| tok2str(vtp_header_values,"Unknown",*(tptr+1)), |
| *(tptr+2)); |
| |
| tptr += VTP_HEADER_LEN; |
| |
| switch (type) { |
| |
| case VTP_SUMMARY_ADV: |
| |
| /* |
| * SUMMARY ADVERTISEMENT |
| * |
| * 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 |
| * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| * | Version | Code | Followers | MmgtD Len | |
| * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| * | Management Domain Name | |
| * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| * | Configuration revision number | |
| * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| * | Updater Identity IP address | |
| * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| * | Update Timestamp (12 bytes) | |
| * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| * | MD5 digest (16 bytes) | |
| * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| * |
| */ |
| |
| printf("\n\t Config Rev %x, Updater %s", |
| EXTRACT_32BITS(tptr), |
| ipaddr_string(tptr+4)); |
| tptr += 8; |
| printf(", Timestamp 0x%08x 0x%08x 0x%08x", |
| EXTRACT_32BITS(tptr), |
| EXTRACT_32BITS(tptr + 4), |
| EXTRACT_32BITS(tptr + 8)); |
| tptr += VTP_UPDATE_TIMESTAMP_LEN; |
| printf(", MD5 digest: %08x%08x%08x%08x", |
| EXTRACT_32BITS(tptr), |
| EXTRACT_32BITS(tptr + 4), |
| EXTRACT_32BITS(tptr + 8), |
| EXTRACT_32BITS(tptr + 12)); |
| tptr += VTP_MD5_DIGEST_LEN; |
| break; |
| |
| case VTP_SUBSET_ADV: |
| |
| /* |
| * SUBSET ADVERTISEMENT |
| * |
| * 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 |
| * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| * | Version | Code | Seq number | MmgtD Len | |
| * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| * | Management Domain Name | |
| * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| * | Configuration revision number | |
| * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| * | VLAN info field 1 | |
| * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| * | ................ | |
| * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| * | VLAN info field N | |
| * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| * |
| */ |
| |
| printf(", Config Rev %x", EXTRACT_32BITS(tptr)); |
| |
| /* |
| * VLAN INFORMATION |
| * 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 |
| * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| * | V info len | Status | VLAN type | VLAN name len | |
| * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| * | ISL vlan id | MTU size | |
| * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| * | 802.10 index (SAID) | |
| * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| * | VLAN name | |
| * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| * |
| */ |
| |
| tptr += 4; |
| while (tptr < (pptr+length)) { |
| |
| len = *tptr; |
| if (len == 0) |
| break; |
| |
| if (!TTEST2(*tptr, len)) |
| goto trunc; |
| |
| vtp_vlan = (struct vtp_vlan_*)tptr; |
| printf("\n\tVLAN info status %s, type %s, VLAN-id %u, MTU %u, SAID 0x%08x, Name %s", |
| tok2str(vtp_vlan_status,"Unknown",vtp_vlan->status), |
| tok2str(vtp_vlan_type_values,"Unknown",vtp_vlan->type), |
| EXTRACT_16BITS(&vtp_vlan->vlanid), |
| EXTRACT_16BITS(&vtp_vlan->mtu), |
| EXTRACT_32BITS(&vtp_vlan->index), |
| (tptr + VTP_VLAN_INFO_OFFSET)); |
| |
| /* |
| * Vlan names are aligned to 32-bit boundaries. |
| */ |
| len -= VTP_VLAN_INFO_OFFSET + 4*((vtp_vlan->name_len + 3)/4); |
| tptr += VTP_VLAN_INFO_OFFSET + 4*((vtp_vlan->name_len + 3)/4); |
| |
| /* TLV information follows */ |
| |
| while (len > 0) { |
| |
| /* |
| * Cisco specs says 2 bytes for type + 2 bytes for length, take only 1 |
| * See: http://www.cisco.com/univercd/cc/td/doc/product/lan/trsrb/frames.htm |
| */ |
| type = *tptr; |
| tlv_len = *(tptr+1); |
| |
| printf("\n\t\t%s (0x%04x) TLV", |
| tok2str(vtp_vlan_tlv_values, "Unknown", type), |
| type); |
| |
| /* |
| * infinite loop check |
| */ |
| if (type == 0 || tlv_len == 0) { |
| return; |
| } |
| |
| if (!TTEST2(*tptr, tlv_len*2 +2)) |
| goto trunc; |
| |
| tlv_value = EXTRACT_16BITS(tptr+2); |
| |
| switch (type) { |
| case VTP_VLAN_STE_HOP_COUNT: |
| printf(", %u", tlv_value); |
| break; |
| |
| case VTP_VLAN_PRUNING: |
| printf(", %s (%u)", |
| tlv_value == 1 ? "Enabled" : "Disabled", |
| tlv_value); |
| break; |
| |
| case VTP_VLAN_STP_TYPE: |
| printf(", %s (%u)", |
| tok2str(vtp_stp_type_values, "Unknown", tlv_value), |
| tlv_value); |
| break; |
| |
| case VTP_VLAN_BRIDGE_TYPE: |
| printf(", %s (%u)", |
| tlv_value == 1 ? "SRB" : "SRT", |
| tlv_value); |
| break; |
| |
| case VTP_VLAN_BACKUP_CRF_MODE: |
| printf(", %s (%u)", |
| tlv_value == 1 ? "Backup" : "Not backup", |
| tlv_value); |
| break; |
| |
| /* |
| * FIXME those are the defined TLVs that lack a decoder |
| * you are welcome to contribute code ;-) |
| */ |
| |
| case VTP_VLAN_SOURCE_ROUTING_RING_NUMBER: |
| case VTP_VLAN_SOURCE_ROUTING_BRIDGE_NUMBER: |
| case VTP_VLAN_PARENT_VLAN: |
| case VTP_VLAN_TRANS_BRIDGED_VLAN: |
| case VTP_VLAN_ARP_HOP_COUNT: |
| default: |
| print_unknown_data(tptr, "\n\t\t ", 2 + tlv_len*2); |
| break; |
| } |
| len -= 2 + tlv_len*2; |
| tptr += 2 + tlv_len*2; |
| } |
| } |
| break; |
| |
| case VTP_ADV_REQUEST: |
| |
| /* |
| * ADVERTISEMENT REQUEST |
| * |
| * 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 |
| * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| * | Version | Code | Reserved | MmgtD Len | |
| * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| * | Management Domain Name | |
| * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| * | Start value | |
| * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| * |
| */ |
| |
| printf("\n\tStart value: %u", EXTRACT_32BITS(tptr)); |
| break; |
| |
| case VTP_JOIN_MESSAGE: |
| |
| /* FIXME - Could not find message format */ |
| break; |
| |
| default: |
| break; |
| } |
| |
| return; |
| |
| trunc: |
| printf("[|vtp]"); |
| } |
| |
| /* |
| * Local Variables: |
| * c-style: whitesmith |
| * c-basic-offset: 4 |
| * End: |
| */ |
