* BSD-style license that accompanies tcpdump or the GNU General
* Public License
*
- * Format and print IEEE 802.1d spanning tree protocol packets.
*/
-#ifndef lint
-static const char rcsid[] =
- "@(#) $Header: /tcpdump/master/tcpdump/print-stp.c,v 1.3 2000-07-01 03:39:10 assar Exp $";
-#endif
+/* \summary: IEEE 802.1d Spanning Tree Protocol (STP) printer */
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
-#include <sys/param.h>
-#include <sys/time.h>
-#include <sys/socket.h>
-
-#include <netinet/in.h>
-#include <netinet/in_systm.h>
-#include <netinet/ip.h>
-#include <netinet/ip_var.h>
-#include <netinet/udp.h>
-#include <netinet/udp_var.h>
-#include <netinet/tcp.h>
-#include <netinet/tcpip.h>
+#include <netdissect-stdinc.h>
-#include <stdlib.h>
#include <stdio.h>
-#include <string.h>
-#include "interface.h"
-#include "addrtoname.h"
+#include "netdissect.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
+#define STP_BPDU_MSTP_MIN_LEN 102
+
+struct stp_bpdu_ {
+ uint8_t protocol_id[2];
+ uint8_t protocol_version;
+ uint8_t bpdu_type;
+ uint8_t flags;
+ uint8_t root_id[8];
+ uint8_t root_path_cost[4];
+ uint8_t bridge_id[8];
+ uint8_t port_id[2];
+ uint8_t message_age[2];
+ uint8_t max_age[2];
+ uint8_t hello_time[2];
+ uint8_t forward_delay[2];
+ uint8_t v1_length;
+};
+
+#define STP_PROTO_REGULAR 0x00
+#define STP_PROTO_RAPID 0x02
+#define STP_PROTO_MSTP 0x03
+#define STP_PROTO_SPB 0x04
+
+static const struct tok stp_proto_values[] = {
+ { STP_PROTO_REGULAR, "802.1d" },
+ { STP_PROTO_RAPID, "802.1w" },
+ { STP_PROTO_MSTP, "802.1s" },
+ { STP_PROTO_SPB, "802.1aq" },
+ { 0, NULL}
+};
+
+#define STP_BPDU_TYPE_CONFIG 0x00
+#define STP_BPDU_TYPE_RSTP 0x02
+#define STP_BPDU_TYPE_TOPO_CHANGE 0x80
+
+static const struct tok stp_bpdu_flag_values[] = {
+ { 0x01, "Topology change" },
+ { 0x02, "Proposal" },
+ { 0x10, "Learn" },
+ { 0x20, "Forward" },
+ { 0x40, "Agreement" },
+ { 0x80, "Topology change ACK" },
+ { 0, NULL}
+};
+
+static const struct tok stp_bpdu_type_values[] = {
+ { STP_BPDU_TYPE_CONFIG, "Config" },
+ { STP_BPDU_TYPE_RSTP, "Rapid STP" },
+ { STP_BPDU_TYPE_TOPO_CHANGE, "Topology Change" },
+ { 0, NULL}
+};
+
+static const struct tok rstp_obj_port_role_values[] = {
+ { 0x00, "Unknown" },
+ { 0x01, "Alternate" },
+ { 0x02, "Root" },
+ { 0x03, "Designated" },
+ { 0, NULL}
+};
+
+#define ND_TCHECK_BRIDGE_ID(p) ND_TCHECK2(*(p), 8)
+
+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 char bridge_id_str[sizeof("pppp.aa:bb:cc:dd:ee:ff")];
+
+ 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]);
+
+ return bridge_id_str;
}
-static void
-stp_print_config_bpdu(const u_char *p, u_int length)
+static int
+stp_print_config_bpdu(netdissect_options *ndo, const struct stp_bpdu_ *stp_bpdu,
+ u_int length)
+{
+ ND_TCHECK(stp_bpdu->flags);
+ ND_PRINT((ndo, ", Flags [%s]",
+ bittok2str(stp_bpdu_flag_values, "none", stp_bpdu->flags)));
+
+ ND_TCHECK(stp_bpdu->port_id);
+ ND_PRINT((ndo, ", 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 (!ndo->ndo_vflag) {
+ return 1;
+ }
+
+ 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_PRINT((ndo, "\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)));
+
+ /* Port role is only valid for 802.1w */
+ if (stp_bpdu->protocol_version == STP_PROTO_RAPID) {
+ ND_PRINT((ndo, ", port-role %s",
+ tok2str(rstp_obj_port_role_values, "Unknown",
+ RSTP_EXTRACT_PORT_ROLE(stp_bpdu->flags))));
+ }
+ return 1;
+
+trunc:
+ return 0;
+}
+
+/*
+ * 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)
{
- printf("config ");
- if (p[7] & 1)
- printf("TOP_CHANGE ");
- if (p[7] & 0x80)
- printf("TOP_CHANGE_ACK ");
+ 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)));
- stp_print_bridge_id(p+20);
- printf(".%.2x%.2x ", p[28], p[29]);
+ 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)));
- printf("root ");
- stp_print_bridge_id(p+8);
+ ND_TCHECK(ptr[MST_BPDU_CIST_REMAIN_HOPS_OFFSET]);
+ ND_PRINT((ndo, "CIST remaining-hops %d", ptr[MST_BPDU_CIST_REMAIN_HOPS_OFFSET]));
- printf(" pathcost %i ", (p[16] << 24) | (p[17] << 16) | (p[18] << 8) | p[19]);
+ /* 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);
- printf("age %i ", p[30]);
- printf("max %i ", p[32]);
- printf("hello %i ", p[34]);
- printf("fdelay %i ", p[36]);
+ 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 void
-stp_print_tcn_bpdu(const u_char *p, u_int length)
+static int
+stp_print_spb_bpdu(netdissect_options *ndo, const struct stp_bpdu_ *stp_bpdu,
+ u_int offset)
{
- printf("tcn");
+ 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 packets.
+ * Print 802.1d / 802.1w / 802.1q (mstp) / 802.1aq (spb) packets.
*/
void
-stp_print(const u_char *p, u_int length)
+stp_print(netdissect_options *ndo, const u_char *p, u_int length)
{
- if (length < 7)
- goto trunc;
-
- printf("802.1d ");
- if (p[2] != 0x03 || p[3] || p[4] || p[5]) {
- printf("unknown version");
- return;
- }
-
- switch (p[6])
- {
- case 0:
- if (length < 10)
- goto trunc;
- stp_print_config_bpdu(p, length);
- break;
-
- case 1:
- stp_print_tcn_bpdu(p, length);
- break;
-
- default:
- printf("unknown type %i\n", p[6]);
- break;
- }
-
- return;
+ const struct stp_bpdu_ *stp_bpdu;
+ u_int mstp_len;
+ u_int spb_len;
+
+ stp_bpdu = (const struct stp_bpdu_*)p;
+
+ /* Minimum STP Frame size. */
+ if (length < 4)
+ goto trunc;
+
+ ND_TCHECK(stp_bpdu->protocol_id);
+ if (EXTRACT_16BITS(&stp_bpdu->protocol_id)) {
+ ND_PRINT((ndo, "unknown STP version, length %u", length));
+ return;
+ }
+
+ ND_TCHECK(stp_bpdu->protocol_version);
+ ND_PRINT((ndo, "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:
+ case STP_PROTO_MSTP:
+ case STP_PROTO_SPB:
+ break;
+ default:
+ return;
+ }
+
+ ND_TCHECK(stp_bpdu->bpdu_type);
+ ND_PRINT((ndo, ", %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;
+ }
+ if (!stp_print_config_bpdu(ndo, stp_bpdu, length))
+ goto trunc;
+ break;
+
+ case STP_BPDU_TYPE_RSTP:
+ if (stp_bpdu->protocol_version == STP_PROTO_RAPID) {
+ if (length < sizeof(struct stp_bpdu_)) {
+ goto trunc;
+ }
+ if (!stp_print_config_bpdu(ndo, stp_bpdu, length))
+ goto trunc;
+ } else if (stp_bpdu->protocol_version == STP_PROTO_MSTP ||
+ stp_bpdu->protocol_version == STP_PROTO_SPB) {
+ if (length < STP_BPDU_MSTP_MIN_LEN) {
+ goto trunc;
+ }
+
+ ND_TCHECK(stp_bpdu->v1_length);
+ if (stp_bpdu->v1_length != 0) {
+ /* FIX ME: Emit a message here ? */
+ goto trunc;
+ }
+
+ /* Validate v3 length */
+ ND_TCHECK_16BITS(p + MST_BPDU_VER3_LEN_OFFSET);
+ 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;
+ }
+ if (!stp_print_mstp_bpdu(ndo, stp_bpdu, length))
+ goto trunc;
+
+ if (stp_bpdu->protocol_version == STP_PROTO_SPB)
+ {
+ /* Validate v4 length */
+ spb_len = EXTRACT_16BITS (p + MST_BPDU_VER3_LEN_OFFSET + mstp_len);
+ spb_len += 2;
+ if (length < (sizeof(struct stp_bpdu_) + mstp_len + spb_len) ||
+ spb_len < SPB_BPDU_MIN_LEN) {
+ goto trunc;
+ }
+ if (!stp_print_spb_bpdu(ndo, stp_bpdu, (sizeof(struct stp_bpdu_) + mstp_len)))
+ goto trunc;
+ }
+ }
+ break;
+
+ case STP_BPDU_TYPE_TOPO_CHANGE:
+ /* always empty message - just break out */
+ break;
+
+ default:
+ break;
+ }
+
+ return;
trunc:
- printf("[|stp %d]", length);
+ ND_PRINT((ndo, "[|stp %d]", length));
}
+
+/*
+ * Local Variables:
+ * c-style: whitesmith
+ * c-basic-offset: 4
+ * End:
+ */
projects / tcpdump / blobdiff