+ * MSTP packet format
+ * Ref. IEEE 802.1Q 2003 Ed. Section 14
+ *
+ * MSTP BPDU
+ *
+ * 2 - bytes Protocol Id
+ * 1 - byte Protocol Ver.
+ * 1 - byte BPDU tye
+ * 1 - byte Flags
+ * 8 - bytes CIST Root Identifier
+ * 4 - bytes CIST External Path Cost
+ * 8 - bytes CIST Regional Root Identifier
+ * 2 - bytes CIST Port Identifier
+ * 2 - bytes Message Age
+ * 2 - bytes Max age
+ * 2 - bytes Hello Time
+ * 2 - bytes Forward delay
+ * 1 - byte Version 1 length. Must be 0
+ * 2 - bytes Version 3 length
+ * 1 - byte Config Identifier
+ * 32 - bytes Config Name
+ * 2 - bytes Revision level
+ * 16 - bytes Config Digest [MD5]
+ * 4 - bytes CIST Internal Root Path Cost
+ * 8 - bytes CIST Bridge Identifier
+ * 1 - byte CIST Remaining Hops
+ * 16 - bytes MSTI information [Max 64 MSTI, each 16 bytes]
+ *
+ *
+ * SPB BPDU
+ * Ref. IEEE 802.1aq. Section 14
+ *
+ * 2 - bytes Version 4 length
+ * 1 - byte Aux Config Identifier
+ * 32 - bytes Aux Config Name
+ * 2 - bytes Aux Revision level
+ * 16 - bytes Aux Config Digest [MD5]
+ * 1 - byte (1 - 2) Agreement Number
+ * (3 - 4) Discarded Agreement Number
+ * (5) Agreement Valid Flag
+ * (6) Restricted Role Flag
+ * (7 - 8) Unused sent zero
+ * 1 - byte Unused
+ * 1 - byte (1 - 4) Agreement Digest Format Identifier
+ * (5 - 8) Agreement Digest Format Capabilities
+ * 1 - byte (1 - 4) Agreement Digest Convention Identifier
+ * (5 - 8) Agreement Digest Convention Capabilities
+ * 2 - bytes Agreement Digest Edge Count
+ * 8 - byte Reserved Set
+ * 20 - bytes Computed Topology Digest
+ *
+ *
+ * MSTI Payload
+ *
+ * 1 - byte MSTI flag
+ * 8 - bytes MSTI Regional Root Identifier
+ * 4 - bytes MSTI Regional Path Cost
+ * 1 - byte MSTI Bridge Priority
+ * 1 - byte MSTI Port Priority
+ * 1 - byte MSTI Remaining Hops
+ *
+ */
+
+#define MST_BPDU_MSTI_LENGTH 16
+#define MST_BPDU_CONFIG_INFO_LENGTH 64
+
+/* Offsets of fields from the begginning for the packet */
+#define MST_BPDU_VER3_LEN_OFFSET 36
+#define MST_BPDU_CONFIG_NAME_OFFSET 39
+#define MST_BPDU_CONFIG_DIGEST_OFFSET 73
+#define MST_BPDU_CIST_INT_PATH_COST_OFFSET 89
+#define MST_BPDU_CIST_BRIDGE_ID_OFFSET 93
+#define MST_BPDU_CIST_REMAIN_HOPS_OFFSET 101
+#define MST_BPDU_MSTI_OFFSET 102
+/* Offsets within an MSTI */
+#define MST_BPDU_MSTI_ROOT_PRIO_OFFSET 1
+#define MST_BPDU_MSTI_ROOT_PATH_COST_OFFSET 9
+#define MST_BPDU_MSTI_BRIDGE_PRIO_OFFSET 13
+#define MST_BPDU_MSTI_PORT_PRIO_OFFSET 14
+#define MST_BPDU_MSTI_REMAIN_HOPS_OFFSET 15
+
+#define SPB_BPDU_MIN_LEN 87
+#define SPB_BPDU_CONFIG_NAME_OFFSET 3
+#define SPB_BPDU_CONFIG_REV_OFFSET SPB_BPDU_CONFIG_NAME_OFFSET + 32
+#define SPB_BPDU_CONFIG_DIGEST_OFFSET SPB_BPDU_CONFIG_REV_OFFSET + 2
+#define SPB_BPDU_AGREEMENT_OFFSET SPB_BPDU_CONFIG_DIGEST_OFFSET + 16
+#define SPB_BPDU_AGREEMENT_UNUSED_OFFSET SPB_BPDU_AGREEMENT_OFFSET + 1
+#define SPB_BPDU_AGREEMENT_FORMAT_OFFSET SPB_BPDU_AGREEMENT_UNUSED_OFFSET + 1
+#define SPB_BPDU_AGREEMENT_CON_OFFSET SPB_BPDU_AGREEMENT_FORMAT_OFFSET + 1
+#define SPB_BPDU_AGREEMENT_EDGE_OFFSET SPB_BPDU_AGREEMENT_CON_OFFSET + 1
+#define SPB_BPDU_AGREEMENT_RES1_OFFSET SPB_BPDU_AGREEMENT_EDGE_OFFSET + 2
+#define SPB_BPDU_AGREEMENT_RES2_OFFSET SPB_BPDU_AGREEMENT_RES1_OFFSET + 4
+#define SPB_BPDU_AGREEMENT_DIGEST_OFFSET SPB_BPDU_AGREEMENT_RES2_OFFSET + 4
+
+static int
+stp_print_mstp_bpdu(netdissect_options *ndo, const struct stp_bpdu_ *stp_bpdu,
+ u_int length)
+{
+ const u_char *ptr;
+ uint16_t v3len;
+ uint16_t len;
+ uint16_t msti;
+ u_int offset;
+
+ ptr = (const u_char *)stp_bpdu;
+ ND_PRINT((ndo, ", CIST Flags [%s], length %u",
+ bittok2str(stp_bpdu_flag_values, "none", stp_bpdu->flags), length));
+
+ /*
+ * in non-verbose mode just print the flags.
+ */
+ if (!ndo->ndo_vflag) {
+ return 1;
+ }
+
+ ND_PRINT((ndo, "\n\tport-role %s, ",
+ tok2str(rstp_obj_port_role_values, "Unknown",
+ RSTP_EXTRACT_PORT_ROLE(stp_bpdu->flags))));
+
+ ND_TCHECK(stp_bpdu->root_path_cost);
+ ND_PRINT((ndo, "CIST root-id %s, CIST ext-pathcost %u",
+ stp_print_bridge_id((const u_char *)&stp_bpdu->root_id),
+ EXTRACT_32BITS(&stp_bpdu->root_path_cost)));
+
+ ND_TCHECK(stp_bpdu->bridge_id);
+ ND_PRINT((ndo, "\n\tCIST regional-root-id %s, ",
+ stp_print_bridge_id((const u_char *)&stp_bpdu->bridge_id)));
+
+ ND_TCHECK(stp_bpdu->port_id);
+ ND_PRINT((ndo, "CIST port-id %04x,", EXTRACT_16BITS(&stp_bpdu->port_id)));
+
+ ND_TCHECK(stp_bpdu->forward_delay);
+ ND_PRINT((ndo, "\n\tmessage-age %.2fs, max-age %.2fs"
+ ", hello-time %.2fs, forwarding-delay %.2fs",
+ (float)EXTRACT_16BITS(&stp_bpdu->message_age) / STP_TIME_BASE,
+ (float)EXTRACT_16BITS(&stp_bpdu->max_age) / STP_TIME_BASE,
+ (float)EXTRACT_16BITS(&stp_bpdu->hello_time) / STP_TIME_BASE,
+ (float)EXTRACT_16BITS(&stp_bpdu->forward_delay) / STP_TIME_BASE));
+
+ ND_TCHECK_16BITS(ptr + MST_BPDU_VER3_LEN_OFFSET);
+ ND_PRINT((ndo, "\n\tv3len %d, ", EXTRACT_16BITS(ptr + MST_BPDU_VER3_LEN_OFFSET)));
+ ND_TCHECK_32BITS(ptr + MST_BPDU_CONFIG_DIGEST_OFFSET + 12);
+ ND_PRINT((ndo, "MCID Name "));
+ if (fn_printzp(ndo, ptr + MST_BPDU_CONFIG_NAME_OFFSET, 32, ndo->ndo_snapend))
+ goto trunc;
+ ND_PRINT((ndo, ", rev %u,"
+ "\n\t\tdigest %08x%08x%08x%08x, ",
+ EXTRACT_16BITS(ptr + MST_BPDU_CONFIG_NAME_OFFSET + 32),
+ EXTRACT_32BITS(ptr + MST_BPDU_CONFIG_DIGEST_OFFSET),
+ EXTRACT_32BITS(ptr + MST_BPDU_CONFIG_DIGEST_OFFSET + 4),
+ EXTRACT_32BITS(ptr + MST_BPDU_CONFIG_DIGEST_OFFSET + 8),
+ EXTRACT_32BITS(ptr + MST_BPDU_CONFIG_DIGEST_OFFSET + 12)));
+
+ ND_TCHECK_32BITS(ptr + MST_BPDU_CIST_INT_PATH_COST_OFFSET);
+ ND_PRINT((ndo, "CIST int-root-pathcost %u,",
+ EXTRACT_32BITS(ptr + MST_BPDU_CIST_INT_PATH_COST_OFFSET)));
+
+ ND_TCHECK_BRIDGE_ID(ptr + MST_BPDU_CIST_BRIDGE_ID_OFFSET);
+ ND_PRINT((ndo, "\n\tCIST bridge-id %s, ",
+ stp_print_bridge_id(ptr + MST_BPDU_CIST_BRIDGE_ID_OFFSET)));
+
+ ND_TCHECK(ptr[MST_BPDU_CIST_REMAIN_HOPS_OFFSET]);
+ ND_PRINT((ndo, "CIST remaining-hops %d", ptr[MST_BPDU_CIST_REMAIN_HOPS_OFFSET]));
+
+ /* Dump all MSTI's */
+ ND_TCHECK_16BITS(ptr + MST_BPDU_VER3_LEN_OFFSET);
+ v3len = EXTRACT_16BITS(ptr + MST_BPDU_VER3_LEN_OFFSET);
+ if (v3len > MST_BPDU_CONFIG_INFO_LENGTH) {
+ len = v3len - MST_BPDU_CONFIG_INFO_LENGTH;
+ offset = MST_BPDU_MSTI_OFFSET;
+ while (len >= MST_BPDU_MSTI_LENGTH) {
+ ND_TCHECK2(*(ptr + offset), MST_BPDU_MSTI_LENGTH);
+
+ msti = EXTRACT_16BITS(ptr + offset +
+ MST_BPDU_MSTI_ROOT_PRIO_OFFSET);
+ msti = msti & 0x0FFF;
+
+ ND_PRINT((ndo, "\n\tMSTI %d, Flags [%s], port-role %s",
+ msti, bittok2str(stp_bpdu_flag_values, "none", ptr[offset]),
+ tok2str(rstp_obj_port_role_values, "Unknown",
+ RSTP_EXTRACT_PORT_ROLE(ptr[offset]))));
+ ND_PRINT((ndo, "\n\t\tMSTI regional-root-id %s, pathcost %u",
+ stp_print_bridge_id(ptr + offset +
+ MST_BPDU_MSTI_ROOT_PRIO_OFFSET),
+ EXTRACT_32BITS(ptr + offset +
+ MST_BPDU_MSTI_ROOT_PATH_COST_OFFSET)));
+ ND_PRINT((ndo, "\n\t\tMSTI bridge-prio %d, port-prio %d, hops %d",
+ ptr[offset + MST_BPDU_MSTI_BRIDGE_PRIO_OFFSET] >> 4,
+ ptr[offset + MST_BPDU_MSTI_PORT_PRIO_OFFSET] >> 4,
+ ptr[offset + MST_BPDU_MSTI_REMAIN_HOPS_OFFSET]));
+
+ len -= MST_BPDU_MSTI_LENGTH;
+ offset += MST_BPDU_MSTI_LENGTH;
+ }
+ }
+ return 1;
+
+trunc:
+ return 0;
+}
+
+static int
+stp_print_spb_bpdu(netdissect_options *ndo, const struct stp_bpdu_ *stp_bpdu,
+ u_int offset)
+{
+ const u_char *ptr;
+
+ /*
+ * in non-verbose mode don't print anything.
+ */
+ if (!ndo->ndo_vflag) {
+ return 1;
+ }
+
+ ptr = (const u_char *)stp_bpdu;
+ ND_TCHECK_32BITS(ptr + offset + SPB_BPDU_AGREEMENT_DIGEST_OFFSET + 16);
+
+ ND_PRINT((ndo, "\n\tv4len %d, ", EXTRACT_16BITS (ptr + offset)));
+ ND_PRINT((ndo, "AUXMCID Name "));
+ if (fn_printzp(ndo, ptr + offset + SPB_BPDU_CONFIG_NAME_OFFSET, 32,
+ ndo->ndo_snapend))
+ goto trunc;
+ ND_PRINT((ndo, ", Rev %u,\n\t\tdigest %08x%08x%08x%08x",
+ EXTRACT_16BITS(ptr + offset + SPB_BPDU_CONFIG_REV_OFFSET),
+ EXTRACT_32BITS(ptr + offset + SPB_BPDU_CONFIG_DIGEST_OFFSET),
+ EXTRACT_32BITS(ptr + offset + SPB_BPDU_CONFIG_DIGEST_OFFSET + 4),
+ EXTRACT_32BITS(ptr + offset + SPB_BPDU_CONFIG_DIGEST_OFFSET + 8),
+ EXTRACT_32BITS(ptr + offset + SPB_BPDU_CONFIG_DIGEST_OFFSET + 12)));
+
+ ND_PRINT((ndo, "\n\tAgreement num %d, Discarded Agreement num %d, Agreement valid-"
+ "flag %d,\n\tRestricted role-flag: %d, Format id %d cap %d, "
+ "Convention id %d cap %d,\n\tEdge count %d, "
+ "Agreement digest %08x%08x%08x%08x%08x\n",
+ ptr[offset + SPB_BPDU_AGREEMENT_OFFSET]>>6,
+ ptr[offset + SPB_BPDU_AGREEMENT_OFFSET]>>4 & 0x3,
+ ptr[offset + SPB_BPDU_AGREEMENT_OFFSET]>>3 & 0x1,
+ ptr[offset + SPB_BPDU_AGREEMENT_OFFSET]>>2 & 0x1,
+ ptr[offset + SPB_BPDU_AGREEMENT_FORMAT_OFFSET]>>4,
+ ptr[offset + SPB_BPDU_AGREEMENT_FORMAT_OFFSET]&0x00ff,
+ ptr[offset + SPB_BPDU_AGREEMENT_CON_OFFSET]>>4,
+ ptr[offset + SPB_BPDU_AGREEMENT_CON_OFFSET]&0x00ff,
+ EXTRACT_16BITS(ptr + offset + SPB_BPDU_AGREEMENT_EDGE_OFFSET),
+ EXTRACT_32BITS(ptr + offset + SPB_BPDU_AGREEMENT_DIGEST_OFFSET),
+ EXTRACT_32BITS(ptr + offset + SPB_BPDU_AGREEMENT_DIGEST_OFFSET+4),
+ EXTRACT_32BITS(ptr + offset + SPB_BPDU_AGREEMENT_DIGEST_OFFSET+8),
+ EXTRACT_32BITS(ptr + offset + SPB_BPDU_AGREEMENT_DIGEST_OFFSET+12),
+ EXTRACT_32BITS(ptr + offset + SPB_BPDU_AGREEMENT_DIGEST_OFFSET+16)));
+ return 1;
+
+trunc:
+ return 0;
+}
+
+/*
+ * Print 802.1d / 802.1w / 802.1q (mstp) / 802.1aq (spb) packets.
projects / tcpdump / blobdiff