diff options
| -rw-r--r-- | contrib/tcpdump/print-stp.c | 365 |
1 files changed, 314 insertions, 51 deletions
diff --git a/contrib/tcpdump/print-stp.c b/contrib/tcpdump/print-stp.c index 3f631d2..4308ae0 100644 --- a/contrib/tcpdump/print-stp.c +++ b/contrib/tcpdump/print-stp.c @@ -11,7 +11,7 @@ #ifndef lint static const char rcsid[] _U_ = - "@(#) $Header: /tcpdump/master/tcpdump/print-stp.c,v 1.13.2.1 2005/04/26 07:27:17 guy Exp $"; +"@(#) $Header: /tcpdump/master/tcpdump/print-stp.c,v 1.13.2.7 2007/03/18 17:12:36 hannes Exp $"; #endif #ifdef HAVE_CONFIG_H @@ -28,75 +28,338 @@ static const char rcsid[] _U_ = #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 +#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) { - 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) +stp_print_config_bpdu(const struct stp_bpdu_ *stp_bpdu, u_int length) { - printf("config "); - if (p[4] & 1) - printf("TOP_CHANGE "); - if (p[4] & 0x80) - printf("TOP_CHANGE_ACK "); + 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); - stp_print_bridge_id(p+17); - printf(".%.2x%.2x ", p[25], p[26]); + /* in non-verbose mode just print the bridge-id */ + if (!vflag) { + return; + } - printf("root "); - stp_print_bridge_id(p+5); + 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(" pathcost %i ", (p[13] << 24) | (p[14] << 16) | (p[15] << 8) | p[16]); + 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)); - printf("age %i ", p[27]); - printf("max %i ", p[29]); - printf("hello %i ", p[31]); - printf("fdelay %i ", p[33]); + /* 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_tcn_bpdu(void) +stp_print_mstp_bpdu(const struct stp_bpdu_ *stp_bpdu, u_int length) { - printf("tcn"); + 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 packets. + * Print 802.1d / 802.1w / 802.1q (mstp) 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; + 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: + */ |
