diff options
Diffstat (limited to 'contrib/tcpdump/print-vtp.c')
| -rw-r--r-- | contrib/tcpdump/print-vtp.c | 378 |
1 files changed, 378 insertions, 0 deletions
diff --git a/contrib/tcpdump/print-vtp.c b/contrib/tcpdump/print-vtp.c new file mode 100644 index 0000000..7631c6f --- /dev/null +++ b/contrib/tcpdump/print-vtp.c @@ -0,0 +1,378 @@ +/* + * 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: + */ |
