| /* |
| * Copyright (c) 2000 Lennert Buytenhek |
| * |
| * This software may be distributed either under the terms of the |
| * BSD-style license that accompanies tcpdump or the GNU General |
| * Public License |
| * |
| * Format and print IEEE 802.1d spanning tree protocol packets. |
| * Contributed by Lennert Buytenhek <buytenh@gnu.org> |
| */ |
| |
| #ifndef lint |
| static const char rcsid[] _U_ = |
| "@(#) $Header: /tcpdump/master/tcpdump/print-stp.c,v 1.20 2007-03-18 17:11:46 hannes Exp $"; |
| #endif |
| |
| #ifdef HAVE_CONFIG_H |
| #include "config.h" |
| #endif |
| |
| #include <tcpdump-stdinc.h> |
| |
| #include <stdlib.h> |
| #include <stdio.h> |
| #include <string.h> |
| |
| #include "interface.h" |
| #include "addrtoname.h" |
| #include "extract.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]; |
| 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 |
| #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} |
| }; |
| |
| #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 STP" }, |
| { 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) |
| { |
| 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 struct stp_bpdu_ *stp_bpdu, u_int length) |
| { |
| 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)); |
| |
| /* 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))); |
| } |
| } |
| |
| /* |
| * 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_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 |
| |
| 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, revision %u, digest %08x%08x%08x%08x", |
| ptr + MST_BPDU_CONFIG_NAME_OFFSET, |
| 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)); |
| |
| 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] >> 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; |
| } |
| } |
| } |
| |
| /* |
| * 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; |
| } |
| |
| 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: |
| case STP_PROTO_MSTP: |
| 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 (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); |
| } |
| 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: |
| */ |
