static int
dissect_extension(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, int offset)
{
guint8 extension_flag;
guint8 extension_type;
guint16 extension_length;
guint8 type;
proto_tree_add_item(tree, hf_btbnep_extension_type, tvb, offset, 1, ENC_BIG_ENDIAN);
proto_tree_add_item(tree, hf_btbnep_extension_flag, tvb, offset, 1, ENC_BIG_ENDIAN);
type = tvb_get_guint8(tvb, offset);
extension_flag = type & 0x01;
extension_type = type >> 1;
offset += 1;
proto_tree_add_item(tree, hf_btbnep_extension_length, tvb, offset, 1, ENC_BIG_ENDIAN);
extension_length = tvb_get_ntohs(tvb, offset);
offset += 2;
if (extension_type == 0x00) {
/* Extension Control */
offset = dissect_control(tvb, pinfo, tree, offset);
} else {
offset += extension_length;
}
if (extension_flag) offset = dissect_extension(tvb, pinfo, tree, offset);
return offset;
}
static void
dissect_btbnep(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
proto_item *pi;
proto_tree *btbnep_tree;
gint offset = 0;
guint bnep_type;
guint extension_flag;
guint type = 0;
proto_item *addr_item;
proto_tree *addr_tree = NULL;
const guint8 *src_addr;
const guint8 *dst_addr;
col_set_str(pinfo->cinfo, COL_PROTOCOL, "BNEP");
col_clear(pinfo->cinfo, COL_INFO);
switch (pinfo->p2p_dir) {
case P2P_DIR_SENT:
col_add_str(pinfo->cinfo, COL_INFO, "Sent ");
break;
case P2P_DIR_RECV:
col_add_str(pinfo->cinfo, COL_INFO, "Rcvd ");
break;
default:
col_add_fstr(pinfo->cinfo, COL_INFO, "Unknown direction %d ",
pinfo->p2p_dir);
break;
}
pi = proto_tree_add_item(tree, proto_btbnep, tvb, offset, -1, ENC_NA);
btbnep_tree = proto_item_add_subtree(pi, ett_btbnep);
proto_tree_add_item(btbnep_tree, hf_btbnep_extension_flag, tvb, offset, 1, ENC_BIG_ENDIAN);
proto_tree_add_item(btbnep_tree, hf_btbnep_bnep_type, tvb, offset, 1, ENC_BIG_ENDIAN);
bnep_type = tvb_get_guint8(tvb, offset);
extension_flag = bnep_type & 0x80;
bnep_type = bnep_type & 0x7F;
offset += 1;
col_append_fstr(pinfo->cinfo, COL_INFO, "%s", val_to_str_const(bnep_type, bnep_type_vals, "Unknown type"));
if (extension_flag) col_append_fstr(pinfo->cinfo, COL_INFO, "+E");
if (bnep_type == BNEP_TYPE_GENERAL_ETHERNET || bnep_type == BNEP_TYPE_COMPRESSED_ETHERNET_DESTINATION_ONLY) {
dst_addr = tvb_get_ptr(tvb, offset, 6);
SET_ADDRESS(&pinfo->dl_dst, AT_ETHER, 6, dst_addr);
SET_ADDRESS(&pinfo->dst, AT_ETHER, 6, dst_addr);
addr_item = proto_tree_add_ether(btbnep_tree, hf_btbnep_dst, tvb, offset, 6, dst_addr);
if (addr_item) addr_tree = proto_item_add_subtree(addr_item, ett_addr);
proto_tree_add_ether(addr_tree, hf_btbnep_addr, tvb, offset, 6, dst_addr);
proto_tree_add_item(addr_tree, hf_btbnep_lg, tvb, offset, 3, ENC_BIG_ENDIAN);
proto_tree_add_item(addr_tree, hf_btbnep_ig, tvb, offset, 3, ENC_BIG_ENDIAN);
offset += 6;
}
if (bnep_type == BNEP_TYPE_GENERAL_ETHERNET || bnep_type == BNEP_TYPE_COMPRESSED_ETHERNET_SOURCE_ONLY) {
src_addr = tvb_get_ptr(tvb, offset, 6);
SET_ADDRESS(&pinfo->dl_src, AT_ETHER, 6, src_addr);
SET_ADDRESS(&pinfo->src, AT_ETHER, 6, src_addr);
addr_item = proto_tree_add_ether(btbnep_tree, hf_btbnep_src, tvb, offset, 6, src_addr);
if (addr_item) {
addr_tree = proto_item_add_subtree(addr_item, ett_addr);
if (tvb_get_guint8(tvb, offset) & 0x01) {
expert_add_info_format(pinfo, addr_item, PI_PROTOCOL, PI_WARN,
"Source MAC must not be a group address: IEEE 802.3-2002, Section 3.2.3(b)");
}
}
proto_tree_add_ether(addr_tree, hf_btbnep_addr, tvb, offset, 6, src_addr);
proto_tree_add_item(addr_tree, hf_btbnep_lg, tvb, offset, 3, ENC_BIG_ENDIAN);
proto_tree_add_item(addr_tree, hf_btbnep_ig, tvb, offset, 3, ENC_BIG_ENDIAN);
offset += 6;
}
if (bnep_type != BNEP_TYPE_CONTROL) {
type = tvb_get_ntohs(tvb, offset);
if (!top_dissect) {
proto_tree_add_item(btbnep_tree, hf_btbnep_type, tvb, offset, 2, ENC_BIG_ENDIAN);
col_append_fstr(pinfo->cinfo, COL_INFO, " - Type: %s", val_to_str_const(type, etype_vals, "unknown"));
}
offset += 2;
} else {
offset = dissect_control(tvb, pinfo, btbnep_tree, offset);
}
if (extension_flag) {
offset = dissect_extension(tvb, pinfo, btbnep_tree, offset);
}
if (bnep_type != BNEP_TYPE_CONTROL) {
/* dissect normal network */
if (top_dissect) {
ethertype(type, tvb, offset, pinfo, tree, btbnep_tree,
hf_btbnep_type, 0, 0);
} else {
tvbuff_t *next_tvb;
next_tvb = tvb_new_subset_remaining(tvb, offset);
call_dissector(data_handle, next_tvb, pinfo, tree);
}
}
}