Wireshark · Ethereal-dev: Re: [Ethereal-dev] Minor STP extensions for MSTP

Ethereal-dev: Re: [Ethereal-dev] Minor STP extensions for MSTP
Note: This archive is from the project's previous web site, ethereal.com. This list is no longer active.
From: Gerald Combs <gerald@xxxxxxxxxxxx>
Date: Sun, 22 Sep 2002 20:51:19 -0500 (CDT)
Checked in.

On Mon, 23 Sep 2002, Clive A Stubbings wrote:

> Hi,
> 
> I presume this is a good place to post "extensions"..
> Here is a patch to add some MSTP ((802.1s, Multiple Spanning Tree) decode
> to the packet-bpdu.c code. Patch is against 0.9.6
> 
> It decodes the static parts but I've not done the MSTI bits yet..
> 
> Cheers
> Clive
> 
> --- packet-bpdu.orig.c	Fri Aug  9 03:34:26 2002
> +++ packet-bpdu.c	Sun Sep 22 16:47:31 2002
> @@ -51,6 +51,14 @@
>  #define BPDU_HELLO_TIME         31
>  #define BPDU_FORWARD_DELAY      33
>  #define BPDU_VERSION_1_LENGTH	35
> +#define BPDU_VERSION_3_LENGTH	36
> +#define BPDU_MST_CONFIG_FORMAT_SELECTOR 38
> +#define BPDU_MST_CONFIG_NAME 39
> +#define BPDU_MST_CONFIG_REVISION_LEVEL 71
> +#define BPDU_MST_CONFIG_DIGEST 73
> +#define BPDU_CIST_INTERNAL_ROOT_PATH_COST 89
> +#define BPDU_CIST_BRIDGE_IDENTIFIER 93
> +#define BPDU_CIST_REMAINING_HOPS	101
>  
>  #define CONF_BPDU_SIZE		35
>  #define TC_BPDU_SIZE		4
> @@ -88,9 +96,18 @@
>  static int hf_bpdu_hello_time = -1;
>  static int hf_bpdu_forward_delay = -1;
>  static int hf_bpdu_version_1_length = -1;
> +static int hf_bpdu_version_3_length = -1;
> +static int hf_bpdu_mst_config_format_selector = -1;
> +static int hf_bpdu_mst_config_name = -1;
> +static int hf_bpdu_mst_config_revision_level = -1;
> +static int hf_bpdu_mst_config_digest = -1;
> +static int hf_bpdu_cist_internal_root_path_cost = -1;
> +static int hf_bpdu_cist_bridge_identifier_mac = -1;
> +static int hf_bpdu_cist_remaining_hops = -1;
>  
>  static gint ett_bpdu = -1;
>  static gint ett_bpdu_flags = -1;
> +static gint ett_mstp = -1;
>  
>  static dissector_handle_t gvrp_handle;
>  static dissector_handle_t gmrp_handle;
> @@ -101,17 +118,27 @@
>  	{ 0, NULL }
>  };
>  
> -#define BPDU_TYPE_CONF			0x00
> -#define BPDU_TYPE_RST			0x02
> -#define BPDU_TYPE_TOPOLOGY_CHANGE	0x80
> +#define BPDU_TYPE_CONF			0x00	// STP Configuration BPDU
> +#define BPDU_TYPE_RST			0x02	// RST BPDU (or MST)
> +#define BPDU_TYPE_TOPOLOGY_CHANGE	0x80	// STP TCN (Topology change notify) BPDU
>  
>  static const value_string bpdu_type_vals[] = {
>  	{ BPDU_TYPE_CONF,            "Configuration" },
> -	{ BPDU_TYPE_RST,             "Rapid Spanning Tree" },
> +	{ BPDU_TYPE_RST,             "Rapid/Multiple Spanning Tree" },
>  	{ BPDU_TYPE_TOPOLOGY_CHANGE, "Topology Change Notification" },
>  	{ 0,                         NULL }
>  };
>  
> +#define PROTO_VERSION_STP	0
> +#define PROTO_VERSION_RSTP 	2
> +#define PROTO_VERSION_MSTP	3
> +
> +static const value_string version_id_vals[] = {
> +	{ PROTO_VERSION_STP,	"Spanning Tree" },
> +	{ PROTO_VERSION_RSTP,	"Rapid Spanning Tree" },
> +	{ PROTO_VERSION_MSTP,	"Multiple Spanning Tree" },
> +	{ 0,			NULL}
> +};
>  static const value_string role_vals[] = {
>  	{ 1, "Alternate or Backup" },
>  	{ 2, "Root" },
> @@ -148,12 +175,23 @@
>        double max_age;
>        double hello_time;
>        double forward_delay;
> +      guint16 version_3_length;
> +      guint32 cist_internal_root_path_cost;
> +      guint8 mst_config_format_selector;
> +      guint16 cist_bridge_identifier_bridge_priority;
> +      const guint8  *cist_bridge_identifier_mac;
> +      gchar   *cist_bridge_identifier_mac_str;
> +      const guint8 *mst_config_name;
> +      guint16 mst_config_revision_level;
> +      guint8 cist_remaining_hops;
>        
>        proto_tree *bpdu_tree;
> +      proto_tree *mstp_tree;
>        proto_item *bpdu_item;
> +      proto_item *mstp_item;
>        proto_tree *flags_tree;
>        proto_item *flags_item;
> -      guint8	rstp_bpdu;
> +      guint8	rstp_bpdu, mstp_bpdu=0;
>        const char *sep;
>  
>        /* GARP application frames require special interpretation of the
> @@ -214,9 +252,9 @@
>  
>        case BPDU_TYPE_CONF:
>        case BPDU_TYPE_RST:
> +	    protocol_version_identifier = tvb_get_guint8(tvb, BPDU_VERSION_IDENTIFIER);
>  	    flags = tvb_get_guint8(tvb, BPDU_FLAGS);
> -	    root_identifier_bridge_priority = tvb_get_ntohs(tvb,
> -	        BPDU_ROOT_IDENTIFIER);
> +	    root_identifier_bridge_priority = tvb_get_ntohs(tvb,BPDU_ROOT_IDENTIFIER);
>  	    root_identifier_mac = tvb_get_ptr(tvb, BPDU_ROOT_IDENTIFIER + 2, 6);
>  	    root_identifier_mac_str = ether_to_str(root_identifier_mac);
>  	    root_path_cost = tvb_get_ntohl(tvb, BPDU_ROOT_PATH_COST);
> @@ -225,6 +263,7 @@
>  
>        default:
>  	    /* Squelch GCC complaints. */
> +	    protocol_version_identifier = 0;
>  	    flags = 0;
>  	    root_identifier_bridge_priority = 0;
>  	    root_identifier_mac = NULL;
> @@ -249,7 +288,8 @@
>  		  break;
>  
>  	    case BPDU_TYPE_RST:
> -		  col_add_fstr(pinfo->cinfo, COL_INFO, "RST. %sRoot = %d/%s  Cost = %d  Port = 0x%04x", 
> +		  col_add_fstr(pinfo->cinfo, COL_INFO, "%cST. %sRoot = %d/%s  Cost = %d  Port = 0x%04x", 
> +			       protocol_version_identifier == 3 ? 'M':'R',
>  			       flags & 0x1 ? "TC + " : "",
>  			       root_identifier_bridge_priority, root_identifier_mac_str, root_path_cost,
>  			       port_identifier);
> @@ -273,7 +313,11 @@
>          break;
>  
>        case BPDU_TYPE_RST:
> -        set_actual_length(tvb, RST_BPDU_SIZE);
> +	if (protocol_version_identifier == 3) {
> +	    version_3_length = tvb_get_ntohs(tvb, BPDU_VERSION_3_LENGTH);
> +	    set_actual_length(tvb, RST_BPDU_SIZE + 2 + version_3_length);
> +	} else
> +	    set_actual_length(tvb, RST_BPDU_SIZE);
>          break;
>        }
>  
> @@ -286,7 +330,6 @@
>  	    proto_tree_add_uint(bpdu_tree, hf_bpdu_proto_id, tvb,
>  				BPDU_IDENTIFIER, 2, protocol_identifier);
>  
> -	    protocol_version_identifier = tvb_get_guint8(tvb, BPDU_VERSION_IDENTIFIER);
>  	    proto_tree_add_uint(bpdu_tree, hf_bpdu_version_id, tvb, 
>  				BPDU_VERSION_IDENTIFIER, 1, 
>  				protocol_version_identifier);
> @@ -294,10 +337,11 @@
>                case 0:
>                  break;
>                case 2:
> +              case 3:
>                  break;
>                default:
>  		  proto_tree_add_text(bpdu_tree, tvb, BPDU_VERSION_IDENTIFIER, 1,
> -		  "   (Warning: this version of Ethereal only knows about versions 0 & 2)");
> +		  "   (Warning: this version of Ethereal only knows about versions 0, 2 & 3)");
>                  break;
>              }
>  	    proto_tree_add_uint(bpdu_tree, hf_bpdu_type, tvb,
> @@ -312,6 +356,8 @@
>  	    }
>  
>              rstp_bpdu = (bpdu_type == BPDU_TYPE_RST);
> +            if (rstp_bpdu) mstp_bpdu = (protocol_version_identifier == 3);
> +
>  	    bridge_identifier_bridge_priority = tvb_get_ntohs(tvb, BPDU_BRIDGE_IDENTIFIER);
>  	    bridge_identifier_mac = tvb_get_ptr(tvb, BPDU_BRIDGE_IDENTIFIER + 2, 6);
>  	    bridge_identifier_mac_str = ether_to_str(bridge_identifier_mac);
> @@ -404,6 +450,48 @@
>  	      proto_tree_add_item(bpdu_tree, hf_bpdu_version_1_length, tvb,
>  				BPDU_VERSION_1_LENGTH, 1, FALSE);
>  	    }
> +	    if (mstp_bpdu) {
> +		version_3_length = tvb_get_ntohs(tvb, BPDU_VERSION_3_LENGTH);
> +
> +		mstp_item = proto_tree_add_uint(bpdu_tree, hf_bpdu_version_3_length, tvb,
> +			BPDU_VERSION_3_LENGTH, 2, version_3_length);
> +		mstp_tree = proto_item_add_subtree(mstp_item, ett_mstp);
> +
> +
> +		mst_config_format_selector = tvb_get_guint8(tvb, BPDU_MST_CONFIG_FORMAT_SELECTOR);
> +		proto_tree_add_uint(mstp_tree, hf_bpdu_mst_config_format_selector, tvb,
> +			BPDU_MST_CONFIG_FORMAT_SELECTOR, 1, mst_config_format_selector);
> +		mst_config_name =  tvb_get_ptr (tvb, BPDU_MST_CONFIG_NAME, 32);
> +		proto_tree_add_string(mstp_tree, hf_bpdu_mst_config_name, tvb, BPDU_MST_CONFIG_NAME, 32, mst_config_name);
> +
> +		mst_config_revision_level = tvb_get_ntohs(tvb, BPDU_MST_CONFIG_REVISION_LEVEL);
> +		proto_tree_add_uint(mstp_tree, hf_bpdu_mst_config_revision_level, tvb,
> +			BPDU_MST_CONFIG_REVISION_LEVEL, 2, mst_config_revision_level);
> +		proto_tree_add_bytes(mstp_tree, hf_bpdu_mst_config_digest, tvb,
> +			BPDU_MST_CONFIG_DIGEST, 16, tvb_get_ptr(tvb, BPDU_MST_CONFIG_DIGEST, 16));
> +			
> +		cist_internal_root_path_cost = tvb_get_ntohl(tvb, BPDU_CIST_INTERNAL_ROOT_PATH_COST);
> +		proto_tree_add_uint(mstp_tree, hf_bpdu_cist_internal_root_path_cost, tvb,
> +			BPDU_CIST_INTERNAL_ROOT_PATH_COST, 4, cist_internal_root_path_cost);
> +
> +		cist_bridge_identifier_bridge_priority = tvb_get_ntohs(tvb,BPDU_CIST_BRIDGE_IDENTIFIER);
> +		cist_bridge_identifier_mac = tvb_get_ptr(tvb, BPDU_CIST_BRIDGE_IDENTIFIER + 2, 6);
> +		cist_bridge_identifier_mac_str = ether_to_str(cist_bridge_identifier_mac);
> +		proto_tree_add_text(mstp_tree, tvb, BPDU_CIST_BRIDGE_IDENTIFIER, 8, 
> +				"CIST Bridge Identifier: %d / %s", 
> +				cist_bridge_identifier_bridge_priority, 
> +				cist_bridge_identifier_mac_str);
> +		proto_tree_add_ether_hidden(mstp_tree, hf_bpdu_cist_bridge_identifier_mac, tvb,
> +				       BPDU_CIST_BRIDGE_IDENTIFIER + 2, 6,
> +				       cist_bridge_identifier_mac);
> +
> +		cist_remaining_hops = tvb_get_guint8(tvb, BPDU_CIST_REMAINING_HOPS);
> +		proto_tree_add_uint(mstp_tree, hf_bpdu_cist_remaining_hops, tvb,
> +			BPDU_CIST_REMAINING_HOPS, 1, cist_remaining_hops);		
> +
> +	/* TODO: MSTI messages */
> +				
> +	    }
>        }
>  }
>  
> @@ -423,7 +511,7 @@
>        	"", HFILL }},
>      { &hf_bpdu_version_id,
>        { "Protocol Version Identifier",	"stp.version",
> -	FT_UINT8,	BASE_DEC,	NULL,	0x0,
> +	FT_UINT8,	BASE_DEC,	VALS(&version_id_vals),	0x0,
>        	"", HFILL }},
>      { &hf_bpdu_type,
>        { "BPDU Type",			"stp.type",
> @@ -497,10 +585,43 @@
>        { "Version 1 Length",		"stp.version_1_length",
>  	FT_UINT8,	BASE_DEC,	NULL,	0x0,
>        	"", HFILL }},
> +    { &hf_bpdu_version_3_length,
> +      { "Version 3 Length",		"mstp.version_3_length",
> +	FT_UINT16,	BASE_DEC,	NULL,	0x0,
> +      	"", HFILL }},
> +    { &hf_bpdu_mst_config_format_selector,
> +      { "MST Config ID format selector",		"mstp.config_format_selector",
> +	FT_UINT8,	BASE_DEC,	NULL,	0x0,
> +      	"", HFILL }},
> +    { &hf_bpdu_mst_config_name,
> +      { "MST Config name",		"mstp.config_name",
> +	FT_STRING,	BASE_DEC,	NULL,	0x0,
> +      	"", HFILL }},
> +    { &hf_bpdu_mst_config_revision_level,
> +      { "MST Config revision",		"mstp.config_revision_level",
> +	FT_UINT16,	BASE_DEC,	NULL,	0x0,
> +      	"", HFILL }},
> +    { &hf_bpdu_mst_config_digest,
> +      { "MST Config digest",		"mstp.config_digest",
> +	FT_BYTES,	BASE_DEC,	NULL,	0x0,
> +      	"", HFILL }},
> +    { &hf_bpdu_cist_internal_root_path_cost,
> +      { "CIST Internal Root Path Cost",		"mstp.cist_internal_root_path_cost",
> +	FT_UINT32,	BASE_DEC,	NULL,	0x0,
> +      	"", HFILL }},
> +    { &hf_bpdu_cist_bridge_identifier_mac,
> +      { "CIST Bridge Identifier",		"mstp.cist_bridge.hw",
> +	FT_ETHER,	BASE_DEC,	NULL,	0x0,
> +      	"", HFILL }},
> +    { &hf_bpdu_cist_remaining_hops,
> +      { "CIST Remaining hops",		"mstp.cist_remaining_hops",
> +	FT_UINT8,	BASE_DEC,	NULL,	0x0,
> +      	"", HFILL }},
>    };
>    static gint *ett[] = {
>      &ett_bpdu,
>      &ett_bpdu_flags,
> +    &ett_mstp,
>    };
>  
>    proto_bpdu = proto_register_protocol("Spanning Tree Protocol", "STP", "stp");
> 
> _______________________________________________
> Ethereal-dev mailing list
> Ethereal-dev@xxxxxxxxxxxx
> http://www.ethereal.com/mailman/listinfo/ethereal-dev
>
References:
- [Ethereal-dev] Minor STP extensions for MSTP
  - From: Clive A Stubbings
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