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-rw-r--r--print-cfm.c766
1 files changed, 766 insertions, 0 deletions
diff --git a/print-cfm.c b/print-cfm.c
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--- /dev/null
+++ b/print-cfm.c
@@ -0,0 +1,766 @@
+/*
+ * 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 "netdissect.h"
+#include "extract.h"
+#include "addrtoname.h"
+#include "oui.h"
+#include "af.h"
+
+
+struct cfm_common_header_t {
+ nd_uint8_t mdlevel_version;
+ nd_uint8_t opcode;
+ nd_uint8_t flags;
+ nd_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, "Continuity 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 {
+ nd_uint32_t sequence;
+ nd_uint16_t ma_epi;
+ nd_byte names[48];
+ nd_byte itu_t_y_1731[16];
+};
+
+/*
+ * Timer Bases for the CCM Interval field.
+ * Expressed in units of seconds.
+ */
+static const float ccm_interval_base[8] = {0.0f, 0.003333f, 0.01f, 0.1f, 1.0f, 10.0f, 60.0f, 600.0f};
+#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 {
+ nd_uint32_t transaction_id;
+};
+
+struct cfm_ltm_t {
+ nd_uint32_t transaction_id;
+ nd_uint8_t ttl;
+ nd_mac_addr original_mac;
+ nd_mac_addr target_mac;
+};
+
+static const struct tok cfm_ltm_flag_values[] = {
+ { 0x80, "Use Forwarding-DB only"},
+ { 0, NULL}
+};
+
+struct cfm_ltr_t {
+ nd_uint32_t transaction_id;
+ nd_uint8_t ttl;
+ nd_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 {
+ nd_uint8_t type;
+ nd_uint16_t length;
+};
+
+/* 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,
+ const u_char *tptr, const u_int length)
+{
+ u_int network_addr_type;
+ u_int hexdump = FALSE;
+
+ /*
+ * Although AFIs are typically 2 octets wide,
+ * 802.1ab specifies that this field width
+ * is only one octet.
+ */
+ if (length < 1) {
+ ND_PRINT("\n\t Network Address Type (invalid, no data");
+ return hexdump;
+ }
+ /* The calling function must make any due ND_TCHECK calls. */
+ network_addr_type = GET_U_1(tptr);
+ ND_PRINT("\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("(invalid IPv4 address length %u)", length - 1);
+ hexdump = TRUE;
+ break;
+ }
+ ND_PRINT(", %s", GET_IPADDR_STRING(tptr + 1));
+ break;
+
+ case AFNUM_INET6:
+ if (length != 1 + 16) {
+ ND_PRINT("(invalid IPv6 address length %u)", length - 1);
+ hexdump = TRUE;
+ break;
+ }
+ ND_PRINT(", %s", GET_IP6ADDR_STRING(tptr + 1));
+ break;
+
+ default:
+ hexdump = TRUE;
+ break;
+ }
+
+ return hexdump;
+}
+
+void
+cfm_print(netdissect_options *ndo,
+ const u_char *pptr, u_int length)
+{
+ const struct cfm_common_header_t *cfm_common_header;
+ uint8_t mdlevel_version, opcode, flags, first_tlv_offset;
+ 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;
+
+ ndo->ndo_protocol = "cfm";
+ tptr=pptr;
+ cfm_common_header = (const struct cfm_common_header_t *)pptr;
+ if (length < sizeof(*cfm_common_header))
+ goto tooshort;
+ ND_TCHECK_SIZE(cfm_common_header);
+
+ /*
+ * Sanity checking of the header.
+ */
+ mdlevel_version = GET_U_1(cfm_common_header->mdlevel_version);
+ if (CFM_EXTRACT_VERSION(mdlevel_version) != CFM_VERSION) {
+ ND_PRINT("CFMv%u not supported, length %u",
+ CFM_EXTRACT_VERSION(mdlevel_version), length);
+ return;
+ }
+
+ opcode = GET_U_1(cfm_common_header->opcode);
+ ND_PRINT("CFMv%u %s, MD Level %u, length %u",
+ CFM_EXTRACT_VERSION(mdlevel_version),
+ tok2str(cfm_opcode_values, "unknown (%u)", opcode),
+ CFM_EXTRACT_MD_LEVEL(mdlevel_version),
+ length);
+
+ /*
+ * In non-verbose mode just print the opcode and md-level.
+ */
+ if (ndo->ndo_vflag < 1) {
+ return;
+ }
+
+ flags = GET_U_1(cfm_common_header->flags);
+ first_tlv_offset = GET_U_1(cfm_common_header->first_tlv_offset);
+ ND_PRINT("\n\tFirst TLV offset %u", first_tlv_offset);
+
+ tptr += sizeof(struct cfm_common_header_t);
+ tlen = length - sizeof(struct cfm_common_header_t);
+
+ /*
+ * Sanity check the first TLV offset.
+ */
+ if (first_tlv_offset > tlen) {
+ ND_PRINT(" (too large, must be <= %u)", tlen);
+ return;
+ }
+
+ switch (opcode) {
+ case CFM_OPCODE_CCM:
+ msg_ptr.cfm_ccm = (const struct cfm_ccm_t *)tptr;
+ if (first_tlv_offset < sizeof(*msg_ptr.cfm_ccm)) {
+ ND_PRINT(" (too small 1, must be >= %zu)",
+ sizeof(*msg_ptr.cfm_ccm));
+ return;
+ }
+ if (tlen < sizeof(*msg_ptr.cfm_ccm))
+ goto tooshort;
+ ND_TCHECK_SIZE(msg_ptr.cfm_ccm);
+
+ ccm_interval = CFM_EXTRACT_CCM_INTERVAL(flags);
+ ND_PRINT(", Flags [CCM Interval %u%s]",
+ ccm_interval,
+ flags & CFM_CCM_RDI_FLAG ?
+ ", RDI" : "");
+
+ /*
+ * Resolve the CCM interval field.
+ */
+ if (ccm_interval) {
+ ND_PRINT("\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("\n\t Sequence Number 0x%08x, MA-End-Point-ID 0x%04x",
+ GET_BE_U_4(msg_ptr.cfm_ccm->sequence),
+ GET_BE_U_2(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 = GET_U_1(namesp);
+ namesp++;
+ names_data_remaining--; /* We know this is != 0 */
+ if (md_nameformat != CFM_CCM_MD_FORMAT_NONE) {
+ md_namelength = GET_U_1(namesp);
+ namesp++;
+ names_data_remaining--; /* We know this is !=0 */
+ ND_PRINT("\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(" (too large, must be <= %u)", names_data_remaining - 2);
+ return;
+ }
+
+ md_name = namesp;
+ ND_PRINT("\n\t MD Name: ");
+ switch (md_nameformat) {
+ case CFM_CCM_MD_FORMAT_DNS:
+ case CFM_CCM_MD_FORMAT_CHAR:
+ nd_printjnp(ndo, md_name, md_namelength);
+ break;
+
+ case CFM_CCM_MD_FORMAT_MAC:
+ if (md_namelength == MAC_ADDR_LEN) {
+ ND_PRINT("\n\t MAC %s", GET_ETHERADDR_STRING(md_name));
+ } else {
+ ND_PRINT("\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("\n\t MD Name Format %s (%u)",
+ tok2str(cfm_md_nameformat_values, "Unknown",
+ md_nameformat),
+ md_nameformat);
+ }
+
+
+ /*
+ * Resolve the MA fields.
+ */
+ ma_nameformat = GET_U_1(namesp);
+ namesp++;
+ names_data_remaining--; /* We know this is != 0 */
+ ma_namelength = GET_U_1(namesp);
+ namesp++;
+ names_data_remaining--; /* We know this is != 0 */
+ ND_PRINT("\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(" (too large, must be <= %u)", names_data_remaining);
+ return;
+ }
+
+ ma_name = namesp;
+ ND_PRINT("\n\t MA Name: ");
+ switch (ma_nameformat) {
+ case CFM_CCM_MA_FORMAT_CHAR:
+ nd_printjnp(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 (first_tlv_offset < sizeof(*msg_ptr.cfm_ltm)) {
+ ND_PRINT(" (too small 4, must be >= %zu)",
+ sizeof(*msg_ptr.cfm_ltm));
+ return;
+ }
+ if (tlen < sizeof(*msg_ptr.cfm_ltm))
+ goto tooshort;
+ ND_TCHECK_SIZE(msg_ptr.cfm_ltm);
+
+ ND_PRINT(", Flags [%s]",
+ bittok2str(cfm_ltm_flag_values, "none", flags));
+
+ ND_PRINT("\n\t Transaction-ID 0x%08x, ttl %u",
+ GET_BE_U_4(msg_ptr.cfm_ltm->transaction_id),
+ GET_U_1(msg_ptr.cfm_ltm->ttl));
+
+ ND_PRINT("\n\t Original-MAC %s, Target-MAC %s",
+ GET_ETHERADDR_STRING(msg_ptr.cfm_ltm->original_mac),
+ GET_ETHERADDR_STRING(msg_ptr.cfm_ltm->target_mac));
+ break;
+
+ case CFM_OPCODE_LTR:
+ msg_ptr.cfm_ltr = (const struct cfm_ltr_t *)tptr;
+ if (first_tlv_offset < sizeof(*msg_ptr.cfm_ltr)) {
+ ND_PRINT(" (too small 5, must be >= %zu)",
+ sizeof(*msg_ptr.cfm_ltr));
+ return;
+ }
+ if (tlen < sizeof(*msg_ptr.cfm_ltr))
+ goto tooshort;
+ ND_TCHECK_SIZE(msg_ptr.cfm_ltr);
+
+ ND_PRINT(", Flags [%s]",
+ bittok2str(cfm_ltr_flag_values, "none", flags));
+
+ ND_PRINT("\n\t Transaction-ID 0x%08x, ttl %u",
+ GET_BE_U_4(msg_ptr.cfm_ltr->transaction_id),
+ GET_U_1(msg_ptr.cfm_ltr->ttl));
+
+ ND_PRINT("\n\t Replay-Action %s (%u)",
+ tok2str(cfm_ltr_replay_action_values,
+ "Unknown",
+ GET_U_1(msg_ptr.cfm_ltr->replay_action)),
+ GET_U_1(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 - first_tlv_offset);
+ break;
+ }
+
+ tptr += first_tlv_offset;
+ tlen -= first_tlv_offset;
+
+ while (tlen > 0) {
+ cfm_tlv_header = (const struct cfm_tlv_header_t *)tptr;
+
+ /* Enough to read the tlv type ? */
+ cfm_tlv_type = GET_U_1(cfm_tlv_header->type);
+
+ ND_PRINT("\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_TCHECK_LEN(tptr, sizeof(struct cfm_tlv_header_t));
+ cfm_tlv_len=GET_BE_U_2(cfm_tlv_header->length);
+
+ ND_PRINT(", 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_TCHECK_LEN(tptr, cfm_tlv_len);
+ hexdump = FALSE;
+
+ switch(cfm_tlv_type) {
+ case CFM_TLV_PORT_STATUS:
+ if (cfm_tlv_len < 1) {
+ ND_PRINT(" (too short, must be >= 1)");
+ return;
+ }
+ ND_PRINT(", Status: %s (%u)",
+ tok2str(cfm_tlv_port_status_values, "Unknown", GET_U_1(tptr)),
+ GET_U_1(tptr));
+ break;
+
+ case CFM_TLV_INTERFACE_STATUS:
+ if (cfm_tlv_len < 1) {
+ ND_PRINT(" (too short, must be >= 1)");
+ return;
+ }
+ ND_PRINT(", Status: %s (%u)",
+ tok2str(cfm_tlv_interface_status_values, "Unknown", GET_U_1(tptr)),
+ GET_U_1(tptr));
+ break;
+
+ case CFM_TLV_PRIVATE:
+ if (cfm_tlv_len < 4) {
+ ND_PRINT(" (too short, must be >= 4)");
+ return;
+ }
+ ND_PRINT(", Vendor: %s (%u), Sub-Type %u",
+ tok2str(oui_values,"Unknown", GET_BE_U_3(tptr)),
+ GET_BE_U_3(tptr),
+ GET_U_1(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(" (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 = GET_U_1(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("\n\t (TLV too short)");
+ goto next_tlv;
+ }
+ chassis_id_type = GET_U_1(tptr);
+ cfm_tlv_len--;
+ ND_PRINT("\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("\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 != MAC_ADDR_LEN) {
+ ND_PRINT(" (invalid MAC address length)");
+ hexdump = TRUE;
+ break;
+ }
+ ND_PRINT("\n\t MAC %s", GET_ETHERADDR_STRING(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:
+ nd_printjnp(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 = GET_U_1(tptr);
+ tptr++;
+ tlen--;
+ cfm_tlv_len--;
+ ND_PRINT("\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("\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(" (Management Address Length is missing)");
+ hexdump = TRUE;
+ break;
+ }
+
+ /* Here mgmt_addr_length stands for the management address length. */
+ mgmt_addr_length = GET_U_1(tptr);
+ tptr++;
+ tlen--;
+ cfm_tlv_len--;
+ ND_PRINT("\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("\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("\n\t\t packet is too short");
+ return;
+
+trunc:
+ nd_print_trunc(ndo);
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-07-10 02:46:55 +0000