#ifndef lint
static const char rcsid[] _U_ =
-"@(#) $Header: /tcpdump/master/tcpdump/print-stp.c,v 1.17 2007-03-07 12:10:54 hannes Exp $";
+"@(#) $Header: /tcpdump/master/tcpdump/print-stp.c,v 1.18 2007-03-08 13:49:46 hannes Exp $";
#endif
#ifdef HAVE_CONFIG_H
#define RSTP_EXTRACT_PORT_ROLE(x) (((x)&0x0C)>>2)
/* STP timers are expressed in multiples of 1/256th second */
#define STP_TIME_BASE 256
+#define STP_BPDU_MSTP_MIN_LEN 102
struct stp_bpdu_ {
u_int8_t protocol_id[2];
#define STP_PROTO_REGULAR 0x00
#define STP_PROTO_RAPID 0x02
+#define STP_PROTO_MSTP 0x03
struct tok stp_proto_values[] = {
{ STP_PROTO_REGULAR, "802.1d" },
{ STP_PROTO_RAPID, "802.1w" },
+ { STP_PROTO_MSTP, "802.1s" },
{ 0, NULL}
};
}
/*
- * Print 802.1d / 802.1w packets.
+ * 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]
+ *
+ * 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_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
+
+static void
+stp_print_mstp_bpdu(const struct stp_bpdu_ *stp_bpdu, u_int length)
+{
+ const u_char *ptr;
+ u_int16_t v3len;
+ u_int16_t len;
+ u_int16_t msti;
+ u_int16_t offset;
+
+ ptr = (const u_char *)stp_bpdu;
+ printf(", CIST Flags [%s]",
+ bittok2str(stp_bpdu_flag_values, "none", stp_bpdu->flags));
+
+ /*
+ * in non-verbose mode just print the flags. We dont read that much
+ * of the packet (DEFAULT_SNAPLEN) to print out cist bridge-id
+ */
+ if (!vflag) {
+ return;
+ }
+
+ printf(", CIST bridge-id %s.%04x, length %u",
+ stp_print_bridge_id(ptr + MST_BPDU_CIST_BRIDGE_ID_OFFSET),
+ EXTRACT_16BITS(&stp_bpdu->port_id), length);
+
+
+ printf("\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);
+
+ printf("\n\tCIST root-id %s, ext-pathcost %u int-pathcost %u",
+ stp_print_bridge_id((const u_char *)&stp_bpdu->root_id),
+ EXTRACT_32BITS(&stp_bpdu->root_path_cost),
+ EXTRACT_32BITS(ptr + MST_BPDU_CIST_INT_PATH_COST_OFFSET));
+
+ printf(", port-role %s",
+ tok2str(rstp_obj_port_role_values, "Unknown",
+ RSTP_EXTRACT_PORT_ROLE(stp_bpdu->flags)));
+
+ printf("\n\tCIST regional-root-id %s",
+ stp_print_bridge_id((const u_char *)&stp_bpdu->bridge_id));
+
+ printf("\n\tMSTP Configuration Name %s",
+ ptr + MST_BPDU_CONFIG_NAME_OFFSET);
+
+ printf("\n\tCIST remaining-hops %d", ptr[MST_BPDU_CIST_REMAIN_HOPS_OFFSET]);
+
+ /* Dump all MSTI's */
+ 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) {
+ msti = EXTRACT_16BITS(ptr + offset +
+ MST_BPDU_MSTI_ROOT_PRIO_OFFSET);
+ msti = msti & 0x0FFF;
+
+ printf("\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])));
+ printf("\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));
+ printf("\n\t\tMSTI bridge-prio %d, port-prio %d, hops %d",
+ ptr[offset + MST_BPDU_MSTI_BRIDGE_PRIO_OFFSET],
+ ptr[offset + MST_BPDU_MSTI_PORT_PRIO_OFFSET],
+ ptr[offset + MST_BPDU_MSTI_REMAIN_HOPS_OFFSET]);
+
+ len -= MST_BPDU_MSTI_LENGTH;
+ offset += MST_BPDU_MSTI_LENGTH;
+ }
+ }
+}
+
+/*
+ * Print 802.1d / 802.1w / 802.1q (mstp) packets.
*/
void
stp_print(const u_char *p, u_int length)
{
const struct stp_bpdu_ *stp_bpdu;
+ u_int16_t mstp_len;
stp_bpdu = (struct stp_bpdu_*)p;
/* Minimum STP Frame size. */
if (length < 4)
goto trunc;
-
+
if (EXTRACT_16BITS(&stp_bpdu->protocol_id)) {
printf("unknown STP version, length %u", length);
return;
switch (stp_bpdu->protocol_version) {
case STP_PROTO_REGULAR:
case STP_PROTO_RAPID:
+ case STP_PROTO_MSTP:
break;
default:
return;
break;
case STP_BPDU_TYPE_RSTP:
- if (length < sizeof(struct stp_bpdu_)) {
- goto trunc;
+ if (stp_bpdu->protocol_version == STP_PROTO_RAPID) {
+ if (length < sizeof(struct stp_bpdu_)) {
+ goto trunc;
+ }
+ stp_print_config_bpdu(stp_bpdu, length);
+ } else if (stp_bpdu->protocol_version == STP_PROTO_MSTP) {
+ if (length < STP_BPDU_MSTP_MIN_LEN) {
+ goto trunc;
+ }
+ if (stp_bpdu->v1_length != 0) {
+ /* FIX ME: Emit a message here ? */
+ goto trunc;
+ }
+ /* Validate v3 length */
+ mstp_len = EXTRACT_16BITS(p + MST_BPDU_VER3_LEN_OFFSET);
+ mstp_len += 2; /* length encoding itself is 2 bytes */
+ if (length < (sizeof(struct stp_bpdu_) + mstp_len)) {
+ goto trunc;
+ }
+ stp_print_mstp_bpdu(stp_bpdu, length);
}
- stp_print_config_bpdu(stp_bpdu, length);
break;
case STP_BPDU_TYPE_TOPO_CHANGE:
projects / tcpdump / commitdiff
