#ifndef lint
static const char rcsid[] _U_ =
- "@(#) $Header: /tcpdump/master/tcpdump/print-stp.c,v 1.14 2005-04-26 07:26:34 guy Exp $";
+"@(#) $Header: /tcpdump/master/tcpdump/print-stp.c,v 1.15 2007-03-06 15:03:51 hannes Exp $";
#endif
#ifdef HAVE_CONFIG_H
#include "addrtoname.h"
#include "extract.h"
-static void
+#define RSTP_EXTRACT_PORT_ROLE(x) (((x)&0x0C)>>2)
+/* STP timers are expressed in multiples of 1/256th second */
+#define STP_TIME_BASE 256
+
+struct stp_bpdu_ {
+ u_int8_t protocol_id[2];
+ u_int8_t protocol_version;
+ u_int8_t bpdu_type;
+ u_int8_t flags;
+ u_int8_t root_id[8];
+ u_int8_t root_path_cost[4];
+ u_int8_t bridge_id[8];
+ u_int8_t port_id[2];
+ u_int8_t message_age[2];
+ u_int8_t max_age[2];
+ u_int8_t hello_time[2];
+ u_int8_t forward_delay[2];
+ u_int8_t v1_length;
+};
+
+#define STP_PROTO_REGULAR 0x00
+#define STP_PROTO_RAPID 0x02
+
+struct tok stp_proto_values[] = {
+ { STP_PROTO_REGULAR, "802.1d" },
+ { STP_PROTO_RAPID, "802.1w" },
+ { 0, NULL}
+};
+
+#define STP_BPDU_TYPE_CONFIG 0x00
+#define STP_BPDU_TYPE_RSTP 0x02
+#define STP_BPDU_TYPE_TOPO_CHANGE 0x80
+
+struct tok stp_bpdu_flag_values[] = {
+ { 0x01, "Topology change" },
+ { 0x02, "Proposal" },
+ { 0x10, "Learn" },
+ { 0x20, "Forward" },
+ { 0x40, "Agreement" },
+ { 0x80, "Topology change ACK" },
+ { 0, NULL}
+};
+
+struct tok stp_bpdu_type_values[] = {
+ { STP_BPDU_TYPE_CONFIG, "Config" },
+ { STP_BPDU_TYPE_RSTP, "Rapid SPT" },
+ { STP_BPDU_TYPE_TOPO_CHANGE, "Topology Change" },
+ { 0, NULL}
+};
+
+struct tok rstp_obj_port_role_values[] = {
+ { 0x00, "Unknown" },
+ { 0x01, "Alternate" },
+ { 0x02, "Root" },
+ { 0x03, "Designated" },
+ { 0, NULL}
+};
+
+static char *
stp_print_bridge_id(const u_char *p)
{
- printf("%.2x%.2x.%.2x:%.2x:%.2x:%.2x:%.2x:%.2x",
- p[0], p[1], p[2], p[3], p[4], p[5], p[6], p[7]);
-}
-
-static void
-stp_print_config_bpdu(const u_char *p)
-{
- printf("config ");
- if (p[4] & 1)
- printf("TOP_CHANGE ");
- if (p[4] & 0x80)
- printf("TOP_CHANGE_ACK ");
+ static char bridge_id_str[sizeof("pppp.aa:bb:cc:dd:ee:ff")];
- stp_print_bridge_id(p+17);
- printf(".%.2x%.2x ", p[25], p[26]);
+ snprintf(bridge_id_str, sizeof(bridge_id_str),
+ "%.2x%.2x.%.2x:%.2x:%.2x:%.2x:%.2x:%.2x",
+ p[0], p[1], p[2], p[3], p[4], p[5], p[6], p[7]);
- printf("root ");
- stp_print_bridge_id(p+5);
-
- printf(" pathcost %i ", (p[13] << 24) | (p[14] << 16) | (p[15] << 8) | p[16]);
-
- printf("age %i ", p[27]);
- printf("max %i ", p[29]);
- printf("hello %i ", p[31]);
- printf("fdelay %i ", p[33]);
+ return bridge_id_str;
}
static void
-stp_print_tcn_bpdu(void)
+stp_print_config_bpdu(const struct stp_bpdu_ *stp_bpdu, u_int length)
{
- printf("tcn");
+ printf(", Flags [%s]",
+ bittok2str(stp_bpdu_flag_values, "none", stp_bpdu->flags));
+
+ printf(", bridge-id %s.%04x, length %u",
+ stp_print_bridge_id((const u_char *)&stp_bpdu->bridge_id),
+ EXTRACT_16BITS(&stp_bpdu->port_id), length);
+
+ /* in non-verbose mode just print the bridge-id */
+ if (!vflag) {
+ return;
+ }
+
+ 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\troot-id %s, root-pathcost %u",
+ stp_print_bridge_id((const u_char *)&stp_bpdu->root_id),
+ EXTRACT_32BITS(&stp_bpdu->root_path_cost) / STP_TIME_BASE);
+
+ /* Port role is only valid for 802.1w */
+ if (stp_bpdu->protocol_version == STP_PROTO_RAPID) {
+ printf(", port-role %s",
+ tok2str(rstp_obj_port_role_values, "Unknown",
+ RSTP_EXTRACT_PORT_ROLE(stp_bpdu->flags)));
+ }
}
/*
- * Print 802.1d packets.
+ * Print 802.1d / 802.1w packets.
*/
void
stp_print(const u_char *p, u_int length)
{
- if (length < 4)
- goto trunc;
-
- printf("802.1d ");
- if (p[0] || p[1] || p[2]) {
- printf("unknown version");
- return;
- }
-
- switch (p[3])
- {
- case 0x00:
- if (length < 10)
- goto trunc;
- stp_print_config_bpdu(p);
- break;
-
- case 0x80:
- stp_print_tcn_bpdu();
- break;
-
- default:
- printf("unknown type %i", p[3]);
- break;
- }
-
- return;
-trunc:
- printf("[|stp %d]", length);
+ const struct stp_bpdu_ *stp_bpdu;
+
+ stp_bpdu = (struct stp_bpdu_*)p;
+
+ /* Minimum SPT Frame size. */
+ if (length < 4)
+ goto trunc;
+
+ if (EXTRACT_16BITS(&stp_bpdu->protocol_id)) {
+ printf("unknown STP version, length %u", length);
+ return;
+ }
+
+ printf("STP %s", tok2str(stp_proto_values, "Unknown STP protocol (0x%02x)",
+ stp_bpdu->protocol_version));
+
+ switch (stp_bpdu->protocol_version) {
+ case STP_PROTO_REGULAR:
+ case STP_PROTO_RAPID:
+ break;
+ default:
+ return;
+ }
+
+ printf(", %s", tok2str(stp_bpdu_type_values, "Unknown BPDU Type (0x%02x)",
+ stp_bpdu->bpdu_type));
+
+ switch (stp_bpdu->bpdu_type) {
+ case STP_BPDU_TYPE_CONFIG:
+ if (length < sizeof(struct stp_bpdu_) - 1) {
+ goto trunc;
+ }
+ stp_print_config_bpdu(stp_bpdu, length);
+ break;
+
+ case STP_BPDU_TYPE_RSTP:
+ if (length < sizeof(struct stp_bpdu_)) {
+ goto trunc;
+ }
+ stp_print_config_bpdu(stp_bpdu, length);
+ break;
+
+ case STP_BPDU_TYPE_TOPO_CHANGE:
+ /* always empty message - just break out */
+ break;
+
+ default:
+ break;
+ }
+
+ return;
+ trunc:
+ printf("[|stp %d]", length);
}
+
+/*
+ * Local Variables:
+ * c-style: whitesmith
+ * c-basic-offset: 4
+ * End:
+ */
projects / tcpdump / commitdiff
