| /* |
| * Copyright (c) 1998-2006 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. |
| * |
| * Original code by Hannes Gredler (hannes@gredler.at) |
| */ |
| |
| /* \summary: IEEE 802.1ag Connectivity Fault Management (CFM) protocols printer */ |
| |
| #ifdef HAVE_CONFIG_H |
| #include "config.h" |
| #endif |
| |
| #include <netdissect-stdinc.h> |
| |
| #include <stdio.h> |
| |
| #include "netdissect.h" |
| #include "extract.h" |
| #include "ether.h" |
| #include "addrtoname.h" |
| #include "oui.h" |
| #include "af.h" |
| |
| struct cfm_common_header_t { |
| uint8_t mdlevel_version; |
| uint8_t opcode; |
| uint8_t flags; |
| uint8_t first_tlv_offset; |
| }; |
| |
| #define CFM_VERSION 0 |
| #define CFM_EXTRACT_VERSION(x) (((x)&0x1f)) |
| #define CFM_EXTRACT_MD_LEVEL(x) (((x)&0xe0)>>5) |
| |
| #define CFM_OPCODE_CCM 1 |
| #define CFM_OPCODE_LBR 2 |
| #define CFM_OPCODE_LBM 3 |
| #define CFM_OPCODE_LTR 4 |
| #define CFM_OPCODE_LTM 5 |
| |
| static const struct tok cfm_opcode_values[] = { |
| { CFM_OPCODE_CCM, "Continouity Check Message"}, |
| { CFM_OPCODE_LBR, "Loopback Reply"}, |
| { CFM_OPCODE_LBM, "Loopback Message"}, |
| { CFM_OPCODE_LTR, "Linktrace Reply"}, |
| { CFM_OPCODE_LTM, "Linktrace Message"}, |
| { 0, NULL} |
| }; |
| |
| /* |
| * Message Formats. |
| */ |
| struct cfm_ccm_t { |
| uint8_t sequence[4]; |
| uint8_t ma_epi[2]; |
| uint8_t names[48]; |
| uint8_t itu_t_y_1731[16]; |
| }; |
| |
| /* |
| * Timer Bases for the CCM Interval field. |
| * Expressed in units of seconds. |
| */ |
| static const float ccm_interval_base[8] = {0, 0.003333, 0.01, 0.1, 1, 10, 60, 600}; |
| #define CCM_INTERVAL_MIN_MULTIPLIER 3.25 |
| #define CCM_INTERVAL_MAX_MULTIPLIER 3.5 |
| |
| #define CFM_CCM_RDI_FLAG 0x80 |
| #define CFM_EXTRACT_CCM_INTERVAL(x) (((x)&0x07)) |
| |
| #define CFM_CCM_MD_FORMAT_8021 0 |
| #define CFM_CCM_MD_FORMAT_NONE 1 |
| #define CFM_CCM_MD_FORMAT_DNS 2 |
| #define CFM_CCM_MD_FORMAT_MAC 3 |
| #define CFM_CCM_MD_FORMAT_CHAR 4 |
| |
| static const struct tok cfm_md_nameformat_values[] = { |
| { CFM_CCM_MD_FORMAT_8021, "IEEE 802.1"}, |
| { CFM_CCM_MD_FORMAT_NONE, "No MD Name present"}, |
| { CFM_CCM_MD_FORMAT_DNS, "DNS string"}, |
| { CFM_CCM_MD_FORMAT_MAC, "MAC + 16Bit Integer"}, |
| { CFM_CCM_MD_FORMAT_CHAR, "Character string"}, |
| { 0, NULL} |
| }; |
| |
| #define CFM_CCM_MA_FORMAT_8021 0 |
| #define CFM_CCM_MA_FORMAT_VID 1 |
| #define CFM_CCM_MA_FORMAT_CHAR 2 |
| #define CFM_CCM_MA_FORMAT_INT 3 |
| #define CFM_CCM_MA_FORMAT_VPN 4 |
| |
| static const struct tok cfm_ma_nameformat_values[] = { |
| { CFM_CCM_MA_FORMAT_8021, "IEEE 802.1"}, |
| { CFM_CCM_MA_FORMAT_VID, "Primary VID"}, |
| { CFM_CCM_MA_FORMAT_CHAR, "Character string"}, |
| { CFM_CCM_MA_FORMAT_INT, "16Bit Integer"}, |
| { CFM_CCM_MA_FORMAT_VPN, "RFC2685 VPN-ID"}, |
| { 0, NULL} |
| }; |
| |
| struct cfm_lbm_t { |
| uint8_t transaction_id[4]; |
| }; |
| |
| struct cfm_ltm_t { |
| uint8_t transaction_id[4]; |
| uint8_t ttl; |
| uint8_t original_mac[ETHER_ADDR_LEN]; |
| uint8_t target_mac[ETHER_ADDR_LEN]; |
| }; |
| |
| static const struct tok cfm_ltm_flag_values[] = { |
| { 0x80, "Use Forwarding-DB only"}, |
| { 0, NULL} |
| }; |
| |
| struct cfm_ltr_t { |
| uint8_t transaction_id[4]; |
| uint8_t ttl; |
| uint8_t replay_action; |
| }; |
| |
| static const struct tok cfm_ltr_flag_values[] = { |
| { 0x80, "UseFDB Only"}, |
| { 0x40, "FwdYes"}, |
| { 0x20, "Terminal MEP"}, |
| { 0, NULL} |
| }; |
| |
| static const struct tok cfm_ltr_replay_action_values[] = { |
| { 1, "Exact Match"}, |
| { 2, "Filtering DB"}, |
| { 3, "MIP CCM DB"}, |
| { 0, NULL} |
| }; |
| |
| |
| #define CFM_TLV_END 0 |
| #define CFM_TLV_SENDER_ID 1 |
| #define CFM_TLV_PORT_STATUS 2 |
| #define CFM_TLV_INTERFACE_STATUS 3 |
| #define CFM_TLV_DATA 4 |
| #define CFM_TLV_REPLY_INGRESS 5 |
| #define CFM_TLV_REPLY_EGRESS 6 |
| #define CFM_TLV_PRIVATE 31 |
| |
| static const struct tok cfm_tlv_values[] = { |
| { CFM_TLV_END, "End"}, |
| { CFM_TLV_SENDER_ID, "Sender ID"}, |
| { CFM_TLV_PORT_STATUS, "Port status"}, |
| { CFM_TLV_INTERFACE_STATUS, "Interface status"}, |
| { CFM_TLV_DATA, "Data"}, |
| { CFM_TLV_REPLY_INGRESS, "Reply Ingress"}, |
| { CFM_TLV_REPLY_EGRESS, "Reply Egress"}, |
| { CFM_TLV_PRIVATE, "Organization Specific"}, |
| { 0, NULL} |
| }; |
| |
| /* |
| * TLVs |
| */ |
| |
| struct cfm_tlv_header_t { |
| uint8_t type; |
| uint8_t length[2]; |
| }; |
| |
| /* FIXME define TLV formats */ |
| |
| static const struct tok cfm_tlv_port_status_values[] = { |
| { 1, "Blocked"}, |
| { 2, "Up"}, |
| { 0, NULL} |
| }; |
| |
| static const struct tok cfm_tlv_interface_status_values[] = { |
| { 1, "Up"}, |
| { 2, "Down"}, |
| { 3, "Testing"}, |
| { 5, "Dormant"}, |
| { 6, "not present"}, |
| { 7, "lower Layer down"}, |
| { 0, NULL} |
| }; |
| |
| #define CFM_CHASSIS_ID_CHASSIS_COMPONENT 1 |
| #define CFM_CHASSIS_ID_INTERFACE_ALIAS 2 |
| #define CFM_CHASSIS_ID_PORT_COMPONENT 3 |
| #define CFM_CHASSIS_ID_MAC_ADDRESS 4 |
| #define CFM_CHASSIS_ID_NETWORK_ADDRESS 5 |
| #define CFM_CHASSIS_ID_INTERFACE_NAME 6 |
| #define CFM_CHASSIS_ID_LOCAL 7 |
| |
| static const struct tok cfm_tlv_senderid_chassisid_values[] = { |
| { 0, "Reserved"}, |
| { CFM_CHASSIS_ID_CHASSIS_COMPONENT, "Chassis component"}, |
| { CFM_CHASSIS_ID_INTERFACE_ALIAS, "Interface alias"}, |
| { CFM_CHASSIS_ID_PORT_COMPONENT, "Port component"}, |
| { CFM_CHASSIS_ID_MAC_ADDRESS, "MAC address"}, |
| { CFM_CHASSIS_ID_NETWORK_ADDRESS, "Network address"}, |
| { CFM_CHASSIS_ID_INTERFACE_NAME, "Interface name"}, |
| { CFM_CHASSIS_ID_LOCAL, "Locally assigned"}, |
| { 0, NULL} |
| }; |
| |
| |
| static int |
| cfm_network_addr_print(netdissect_options *ndo, |
| register const u_char *tptr, const u_int length) |
| { |
| u_int network_addr_type; |
| u_int hexdump = FALSE; |
| |
| /* |
| * Altough AFIs are tpically 2 octects wide, |
| * 802.1ab specifies that this field width |
| * is only once octet |
| */ |
| if (length < 1) { |
| ND_PRINT((ndo, "\n\t Network Address Type (invalid, no data")); |
| return hexdump; |
| } |
| /* The calling function must make any due ND_TCHECK calls. */ |
| network_addr_type = *tptr; |
| ND_PRINT((ndo, "\n\t Network Address Type %s (%u)", |
| tok2str(af_values, "Unknown", network_addr_type), |
| network_addr_type)); |
| |
| /* |
| * Resolve the passed in Address. |
| */ |
| switch(network_addr_type) { |
| case AFNUM_INET: |
| if (length != 1 + 4) { |
| ND_PRINT((ndo, "(invalid IPv4 address length %u)", length - 1)); |
| hexdump = TRUE; |
| break; |
| } |
| ND_PRINT((ndo, ", %s", ipaddr_string(ndo, tptr + 1))); |
| break; |
| |
| case AFNUM_INET6: |
| if (length != 1 + 16) { |
| ND_PRINT((ndo, "(invalid IPv6 address length %u)", length - 1)); |
| hexdump = TRUE; |
| break; |
| } |
| ND_PRINT((ndo, ", %s", ip6addr_string(ndo, tptr + 1))); |
| break; |
| |
| default: |
| hexdump = TRUE; |
| break; |
| } |
| |
| return hexdump; |
| } |
| |
| void |
| cfm_print(netdissect_options *ndo, |
| register const u_char *pptr, register u_int length) |
| { |
| const struct cfm_common_header_t *cfm_common_header; |
| const struct cfm_tlv_header_t *cfm_tlv_header; |
| const uint8_t *tptr, *tlv_ptr; |
| const uint8_t *namesp; |
| u_int names_data_remaining; |
| uint8_t md_nameformat, md_namelength; |
| const uint8_t *md_name; |
| uint8_t ma_nameformat, ma_namelength; |
| const uint8_t *ma_name; |
| u_int hexdump, tlen, cfm_tlv_len, cfm_tlv_type, ccm_interval; |
| |
| |
| union { |
| const struct cfm_ccm_t *cfm_ccm; |
| const struct cfm_lbm_t *cfm_lbm; |
| const struct cfm_ltm_t *cfm_ltm; |
| const struct cfm_ltr_t *cfm_ltr; |
| } msg_ptr; |
| |
| tptr=pptr; |
| cfm_common_header = (const struct cfm_common_header_t *)pptr; |
| if (length < sizeof(*cfm_common_header)) |
| goto tooshort; |
| ND_TCHECK(*cfm_common_header); |
| |
| /* |
| * Sanity checking of the header. |
| */ |
| if (CFM_EXTRACT_VERSION(cfm_common_header->mdlevel_version) != CFM_VERSION) { |
| ND_PRINT((ndo, "CFMv%u not supported, length %u", |
| CFM_EXTRACT_VERSION(cfm_common_header->mdlevel_version), length)); |
| return; |
| } |
| |
| ND_PRINT((ndo, "CFMv%u %s, MD Level %u, length %u", |
| CFM_EXTRACT_VERSION(cfm_common_header->mdlevel_version), |
| tok2str(cfm_opcode_values, "unknown (%u)", cfm_common_header->opcode), |
| CFM_EXTRACT_MD_LEVEL(cfm_common_header->mdlevel_version), |
| length)); |
| |
| /* |
| * In non-verbose mode just print the opcode and md-level. |
| */ |
| if (ndo->ndo_vflag < 1) { |
| return; |
| } |
| |
| ND_PRINT((ndo, "\n\tFirst TLV offset %u", cfm_common_header->first_tlv_offset)); |
| |
| tptr += sizeof(const struct cfm_common_header_t); |
| tlen = length - sizeof(struct cfm_common_header_t); |
| |
| /* |
| * Sanity check the first TLV offset. |
| */ |
| if (cfm_common_header->first_tlv_offset > tlen) { |
| ND_PRINT((ndo, " (too large, must be <= %u)", tlen)); |
| return; |
| } |
| |
| switch (cfm_common_header->opcode) { |
| case CFM_OPCODE_CCM: |
| msg_ptr.cfm_ccm = (const struct cfm_ccm_t *)tptr; |
| if (cfm_common_header->first_tlv_offset < sizeof(*msg_ptr.cfm_ccm)) { |
| ND_PRINT((ndo, " (too small 1, must be >= %lu)", |
| (unsigned long) sizeof(*msg_ptr.cfm_ccm))); |
| return; |
| } |
| if (tlen < sizeof(*msg_ptr.cfm_ccm)) |
| goto tooshort; |
| ND_TCHECK(*msg_ptr.cfm_ccm); |
| |
| ccm_interval = CFM_EXTRACT_CCM_INTERVAL(cfm_common_header->flags); |
| ND_PRINT((ndo, ", Flags [CCM Interval %u%s]", |
| ccm_interval, |
| cfm_common_header->flags & CFM_CCM_RDI_FLAG ? |
| ", RDI" : "")); |
| |
| /* |
| * Resolve the CCM interval field. |
| */ |
| if (ccm_interval) { |
| ND_PRINT((ndo, "\n\t CCM Interval %.3fs" |
| ", min CCM Lifetime %.3fs, max CCM Lifetime %.3fs", |
| ccm_interval_base[ccm_interval], |
| ccm_interval_base[ccm_interval] * CCM_INTERVAL_MIN_MULTIPLIER, |
| ccm_interval_base[ccm_interval] * CCM_INTERVAL_MAX_MULTIPLIER)); |
| } |
| |
| ND_PRINT((ndo, "\n\t Sequence Number 0x%08x, MA-End-Point-ID 0x%04x", |
| EXTRACT_32BITS(msg_ptr.cfm_ccm->sequence), |
| EXTRACT_16BITS(msg_ptr.cfm_ccm->ma_epi))); |
| |
| namesp = msg_ptr.cfm_ccm->names; |
| names_data_remaining = sizeof(msg_ptr.cfm_ccm->names); |
| |
| /* |
| * Resolve the MD fields. |
| */ |
| md_nameformat = *namesp; |
| namesp++; |
| names_data_remaining--; /* We know this is != 0 */ |
| if (md_nameformat != CFM_CCM_MD_FORMAT_NONE) { |
| md_namelength = *namesp; |
| namesp++; |
| names_data_remaining--; /* We know this is !=0 */ |
| ND_PRINT((ndo, "\n\t MD Name Format %s (%u), MD Name length %u", |
| tok2str(cfm_md_nameformat_values, "Unknown", |
| md_nameformat), |
| md_nameformat, |
| md_namelength)); |
| |
| /* |
| * -3 for the MA short name format and length and one byte |
| * of MA short name. |
| */ |
| if (md_namelength > names_data_remaining - 3) { |
| ND_PRINT((ndo, " (too large, must be <= %u)", names_data_remaining - 2)); |
| return; |
| } |
| |
| md_name = namesp; |
| ND_PRINT((ndo, "\n\t MD Name: ")); |
| switch (md_nameformat) { |
| case CFM_CCM_MD_FORMAT_DNS: |
| case CFM_CCM_MD_FORMAT_CHAR: |
| safeputs(ndo, md_name, md_namelength); |
| break; |
| |
| case CFM_CCM_MD_FORMAT_MAC: |
| if (md_namelength == 6) { |
| ND_PRINT((ndo, "\n\t MAC %s", etheraddr_string(ndo, |
| md_name))); |
| } else { |
| ND_PRINT((ndo, "\n\t MAC (length invalid)")); |
| } |
| break; |
| |
| /* FIXME add printers for those MD formats - hexdump for now */ |
| case CFM_CCM_MA_FORMAT_8021: |
| default: |
| print_unknown_data(ndo, md_name, "\n\t ", |
| md_namelength); |
| } |
| namesp += md_namelength; |
| names_data_remaining -= md_namelength; |
| } else { |
| ND_PRINT((ndo, "\n\t MD Name Format %s (%u)", |
| tok2str(cfm_md_nameformat_values, "Unknown", |
| md_nameformat), |
| md_nameformat)); |
| } |
| |
| |
| /* |
| * Resolve the MA fields. |
| */ |
| ma_nameformat = *namesp; |
| namesp++; |
| names_data_remaining--; /* We know this is != 0 */ |
| ma_namelength = *namesp; |
| namesp++; |
| names_data_remaining--; /* We know this is != 0 */ |
| ND_PRINT((ndo, "\n\t MA Name-Format %s (%u), MA name length %u", |
| tok2str(cfm_ma_nameformat_values, "Unknown", |
| ma_nameformat), |
| ma_nameformat, |
| ma_namelength)); |
| |
| if (ma_namelength > names_data_remaining) { |
| ND_PRINT((ndo, " (too large, must be <= %u)", names_data_remaining)); |
| return; |
| } |
| |
| ma_name = namesp; |
| ND_PRINT((ndo, "\n\t MA Name: ")); |
| switch (ma_nameformat) { |
| case CFM_CCM_MA_FORMAT_CHAR: |
| safeputs(ndo, ma_name, ma_namelength); |
| break; |
| |
| /* FIXME add printers for those MA formats - hexdump for now */ |
| case CFM_CCM_MA_FORMAT_8021: |
| case CFM_CCM_MA_FORMAT_VID: |
| case CFM_CCM_MA_FORMAT_INT: |
| case CFM_CCM_MA_FORMAT_VPN: |
| default: |
| print_unknown_data(ndo, ma_name, "\n\t ", ma_namelength); |
| } |
| break; |
| |
| case CFM_OPCODE_LTM: |
| msg_ptr.cfm_ltm = (const struct cfm_ltm_t *)tptr; |
| if (cfm_common_header->first_tlv_offset < sizeof(*msg_ptr.cfm_ltm)) { |
| ND_PRINT((ndo, " (too small 4, must be >= %lu)", |
| (unsigned long) sizeof(*msg_ptr.cfm_ltm))); |
| return; |
| } |
| if (tlen < sizeof(*msg_ptr.cfm_ltm)) |
| goto tooshort; |
| ND_TCHECK(*msg_ptr.cfm_ltm); |
| |
| ND_PRINT((ndo, ", Flags [%s]", |
| bittok2str(cfm_ltm_flag_values, "none", cfm_common_header->flags))); |
| |
| ND_PRINT((ndo, "\n\t Transaction-ID 0x%08x, ttl %u", |
| EXTRACT_32BITS(msg_ptr.cfm_ltm->transaction_id), |
| msg_ptr.cfm_ltm->ttl)); |
| |
| ND_PRINT((ndo, "\n\t Original-MAC %s, Target-MAC %s", |
| etheraddr_string(ndo, msg_ptr.cfm_ltm->original_mac), |
| etheraddr_string(ndo, msg_ptr.cfm_ltm->target_mac))); |
| break; |
| |
| case CFM_OPCODE_LTR: |
| msg_ptr.cfm_ltr = (const struct cfm_ltr_t *)tptr; |
| if (cfm_common_header->first_tlv_offset < sizeof(*msg_ptr.cfm_ltr)) { |
| ND_PRINT((ndo, " (too small 5, must be >= %lu)", |
| (unsigned long) sizeof(*msg_ptr.cfm_ltr))); |
| return; |
| } |
| if (tlen < sizeof(*msg_ptr.cfm_ltr)) |
| goto tooshort; |
| ND_TCHECK(*msg_ptr.cfm_ltr); |
| |
| ND_PRINT((ndo, ", Flags [%s]", |
| bittok2str(cfm_ltr_flag_values, "none", cfm_common_header->flags))); |
| |
| ND_PRINT((ndo, "\n\t Transaction-ID 0x%08x, ttl %u", |
| EXTRACT_32BITS(msg_ptr.cfm_ltr->transaction_id), |
| msg_ptr.cfm_ltr->ttl)); |
| |
| ND_PRINT((ndo, "\n\t Replay-Action %s (%u)", |
| tok2str(cfm_ltr_replay_action_values, |
| "Unknown", |
| msg_ptr.cfm_ltr->replay_action), |
| msg_ptr.cfm_ltr->replay_action)); |
| break; |
| |
| /* |
| * No message decoder yet. |
| * Hexdump everything up until the start of the TLVs |
| */ |
| case CFM_OPCODE_LBR: |
| case CFM_OPCODE_LBM: |
| default: |
| print_unknown_data(ndo, tptr, "\n\t ", |
| tlen - cfm_common_header->first_tlv_offset); |
| break; |
| } |
| |
| tptr += cfm_common_header->first_tlv_offset; |
| tlen -= cfm_common_header->first_tlv_offset; |
| |
| while (tlen > 0) { |
| cfm_tlv_header = (const struct cfm_tlv_header_t *)tptr; |
| |
| /* Enough to read the tlv type ? */ |
| ND_TCHECK2(*tptr, 1); |
| cfm_tlv_type=cfm_tlv_header->type; |
| |
| ND_PRINT((ndo, "\n\t%s TLV (0x%02x)", |
| tok2str(cfm_tlv_values, "Unknown", cfm_tlv_type), |
| cfm_tlv_type)); |
| |
| if (cfm_tlv_type == CFM_TLV_END) { |
| /* Length is "Not present if the Type field is 0." */ |
| return; |
| } |
| |
| /* do we have the full tlv header ? */ |
| if (tlen < sizeof(struct cfm_tlv_header_t)) |
| goto tooshort; |
| ND_TCHECK2(*tptr, sizeof(struct cfm_tlv_header_t)); |
| cfm_tlv_len=EXTRACT_16BITS(&cfm_tlv_header->length); |
| |
| ND_PRINT((ndo, ", length %u", cfm_tlv_len)); |
| |
| tptr += sizeof(struct cfm_tlv_header_t); |
| tlen -= sizeof(struct cfm_tlv_header_t); |
| tlv_ptr = tptr; |
| |
| /* do we have the full tlv ? */ |
| if (tlen < cfm_tlv_len) |
| goto tooshort; |
| ND_TCHECK2(*tptr, cfm_tlv_len); |
| hexdump = FALSE; |
| |
| switch(cfm_tlv_type) { |
| case CFM_TLV_PORT_STATUS: |
| if (cfm_tlv_len < 1) { |
| ND_PRINT((ndo, " (too short, must be >= 1)")); |
| return; |
| } |
| ND_PRINT((ndo, ", Status: %s (%u)", |
| tok2str(cfm_tlv_port_status_values, "Unknown", *tptr), |
| *tptr)); |
| break; |
| |
| case CFM_TLV_INTERFACE_STATUS: |
| if (cfm_tlv_len < 1) { |
| ND_PRINT((ndo, " (too short, must be >= 1)")); |
| return; |
| } |
| ND_PRINT((ndo, ", Status: %s (%u)", |
| tok2str(cfm_tlv_interface_status_values, "Unknown", *tptr), |
| *tptr)); |
| break; |
| |
| case CFM_TLV_PRIVATE: |
| if (cfm_tlv_len < 4) { |
| ND_PRINT((ndo, " (too short, must be >= 4)")); |
| return; |
| } |
| ND_PRINT((ndo, ", Vendor: %s (%u), Sub-Type %u", |
| tok2str(oui_values,"Unknown", EXTRACT_24BITS(tptr)), |
| EXTRACT_24BITS(tptr), |
| *(tptr + 3))); |
| hexdump = TRUE; |
| break; |
| |
| case CFM_TLV_SENDER_ID: |
| { |
| u_int chassis_id_type, chassis_id_length; |
| u_int mgmt_addr_length; |
| |
| if (cfm_tlv_len < 1) { |
| ND_PRINT((ndo, " (too short, must be >= 1)")); |
| goto next_tlv; |
| } |
| |
| /* |
| * Get the Chassis ID length and check it. |
| * IEEE 802.1Q-2014 Section 21.5.3.1 |
| */ |
| chassis_id_length = *tptr; |
| tptr++; |
| tlen--; |
| cfm_tlv_len--; |
| |
| if (chassis_id_length) { |
| /* |
| * IEEE 802.1Q-2014 Section 21.5.3.2: Chassis ID Subtype, references |
| * IEEE 802.1AB-2005 Section 9.5.2.2, subsequently |
| * IEEE 802.1AB-2016 Section 8.5.2.2: chassis ID subtype |
| */ |
| if (cfm_tlv_len < 1) { |
| ND_PRINT((ndo, "\n\t (TLV too short)")); |
| goto next_tlv; |
| } |
| chassis_id_type = *tptr; |
| cfm_tlv_len--; |
| ND_PRINT((ndo, "\n\t Chassis-ID Type %s (%u), Chassis-ID length %u", |
| tok2str(cfm_tlv_senderid_chassisid_values, |
| "Unknown", |
| chassis_id_type), |
| chassis_id_type, |
| chassis_id_length)); |
| |
| if (cfm_tlv_len < chassis_id_length) { |
| ND_PRINT((ndo, "\n\t (TLV too short)")); |
| goto next_tlv; |
| } |
| |
| /* IEEE 802.1Q-2014 Section 21.5.3.3: Chassis ID */ |
| switch (chassis_id_type) { |
| case CFM_CHASSIS_ID_MAC_ADDRESS: |
| if (chassis_id_length != ETHER_ADDR_LEN) { |
| ND_PRINT((ndo, " (invalid MAC address length)")); |
| hexdump = TRUE; |
| break; |
| } |
| ND_PRINT((ndo, "\n\t MAC %s", etheraddr_string(ndo, tptr + 1))); |
| break; |
| |
| case CFM_CHASSIS_ID_NETWORK_ADDRESS: |
| hexdump |= cfm_network_addr_print(ndo, tptr + 1, chassis_id_length); |
| break; |
| |
| case CFM_CHASSIS_ID_INTERFACE_NAME: /* fall through */ |
| case CFM_CHASSIS_ID_INTERFACE_ALIAS: |
| case CFM_CHASSIS_ID_LOCAL: |
| case CFM_CHASSIS_ID_CHASSIS_COMPONENT: |
| case CFM_CHASSIS_ID_PORT_COMPONENT: |
| safeputs(ndo, tptr + 1, chassis_id_length); |
| break; |
| |
| default: |
| hexdump = TRUE; |
| break; |
| } |
| cfm_tlv_len -= chassis_id_length; |
| |
| tptr += 1 + chassis_id_length; |
| tlen -= 1 + chassis_id_length; |
| } |
| |
| /* |
| * Check if there is a Management Address. |
| * IEEE 802.1Q-2014 Section 21.5.3.4: Management Address Domain Length |
| * This and all subsequent fields are not present if the TLV length |
| * allows only the above fields. |
| */ |
| if (cfm_tlv_len == 0) { |
| /* No, there isn't; we're done. */ |
| break; |
| } |
| |
| /* Here mgmt_addr_length stands for the management domain length. */ |
| mgmt_addr_length = *tptr; |
| tptr++; |
| tlen--; |
| cfm_tlv_len--; |
| ND_PRINT((ndo, "\n\t Management Address Domain Length %u", mgmt_addr_length)); |
| if (mgmt_addr_length) { |
| /* IEEE 802.1Q-2014 Section 21.5.3.5: Management Address Domain */ |
| if (cfm_tlv_len < mgmt_addr_length) { |
| ND_PRINT((ndo, "\n\t (TLV too short)")); |
| goto next_tlv; |
| } |
| cfm_tlv_len -= mgmt_addr_length; |
| /* |
| * XXX - this is an OID; print it as such. |
| */ |
| hex_print(ndo, "\n\t Management Address Domain: ", tptr, mgmt_addr_length); |
| tptr += mgmt_addr_length; |
| tlen -= mgmt_addr_length; |
| |
| /* |
| * IEEE 802.1Q-2014 Section 21.5.3.6: Management Address Length |
| * This field is present if Management Address Domain Length is not 0. |
| */ |
| if (cfm_tlv_len < 1) { |
| ND_PRINT((ndo, " (Management Address Length is missing)")); |
| hexdump = TRUE; |
| break; |
| } |
| |
| /* Here mgmt_addr_length stands for the management address length. */ |
| mgmt_addr_length = *tptr; |
| tptr++; |
| tlen--; |
| cfm_tlv_len--; |
| ND_PRINT((ndo, "\n\t Management Address Length %u", mgmt_addr_length)); |
| if (mgmt_addr_length) { |
| /* IEEE 802.1Q-2014 Section 21.5.3.7: Management Address */ |
| if (cfm_tlv_len < mgmt_addr_length) { |
| ND_PRINT((ndo, "\n\t (TLV too short)")); |
| return; |
| } |
| cfm_tlv_len -= mgmt_addr_length; |
| /* |
| * XXX - this is a TransportDomain; print it as such. |
| */ |
| hex_print(ndo, "\n\t Management Address: ", tptr, mgmt_addr_length); |
| tptr += mgmt_addr_length; |
| tlen -= mgmt_addr_length; |
| } |
| } |
| break; |
| } |
| |
| /* |
| * FIXME those are the defined TLVs that lack a decoder |
| * you are welcome to contribute code ;-) |
| */ |
| |
| case CFM_TLV_DATA: |
| case CFM_TLV_REPLY_INGRESS: |
| case CFM_TLV_REPLY_EGRESS: |
| default: |
| hexdump = TRUE; |
| break; |
| } |
| /* do we want to see an additional hexdump ? */ |
| if (hexdump || ndo->ndo_vflag > 1) |
| print_unknown_data(ndo, tlv_ptr, "\n\t ", cfm_tlv_len); |
| |
| next_tlv: |
| tptr+=cfm_tlv_len; |
| tlen-=cfm_tlv_len; |
| } |
| return; |
| |
| tooshort: |
| ND_PRINT((ndo, "\n\t\t packet is too short")); |
| return; |
| |
| trunc: |
| ND_PRINT((ndo, "\n\t\t packet exceeded snapshot")); |
| } |
