/* packet-llc.c * Routines for IEEE 802.2 LLC layer * Gilbert Ramirez * * Wireshark - Network traffic analyzer * By Gerald Combs * Copyright 1998 Gerald Combs * * SPDX-License-Identifier: GPL-2.0-or-later */ #include "config.h" #include #include #include #include #include #include #include #include #include #include #include #include "packet-fc.h" #include "packet-ip.h" #include "packet-ipx.h" #include "packet-netbios.h" #include "packet-sll.h" #include "packet-juniper.h" #include "packet-llc.h" void proto_register_basicxid(void); void proto_register_llc(void); void proto_reg_handoff_llc(void); #define UDP_PORT_LLC_RANGE "12000-12004" static int proto_llc; static int hf_llc_dsap; static int hf_llc_ssap; static int hf_llc_dsap_sap; static int hf_llc_dsap_ig; static int hf_llc_ssap_sap; static int hf_llc_ssap_cr; static int hf_llc_ctrl; static int hf_llc_n_r; static int hf_llc_n_s; static int hf_llc_p; static int hf_llc_p_ext; static int hf_llc_f; static int hf_llc_f_ext; static int hf_llc_s_ftype; static int hf_llc_u_modifier_cmd; static int hf_llc_u_modifier_resp; static int hf_llc_ftype_i; static int hf_llc_ftype_s_u; static int hf_llc_ftype_s_u_ext; static int hf_llc_type; static int hf_llc_oui; static int hf_llc_pid; static int proto_basicxid; static int hf_llc_xid_format; static int hf_llc_xid_types; static int hf_llc_xid_wsize; static int ett_llc; static int ett_llc_dsap; static int ett_llc_ssap; static int ett_llc_ctrl; static int ett_llc_basicxid; static dissector_table_t dsap_subdissector_table; static dissector_table_t xid_subdissector_table; static dissector_table_t ethertype_subdissector_table; static dissector_table_t hpteam_subdissector_table; static dissector_table_t other_control_dissector_table; static dissector_handle_t bpdu_handle; static dissector_handle_t eth_withoutfcs_handle; static dissector_handle_t eth_withfcs_handle; static dissector_handle_t fddi_handle; static dissector_handle_t tr_handle; static dissector_handle_t turbo_handle; static dissector_handle_t mesh_handle; static dissector_handle_t llc_handle; static dissector_handle_t epd_llc_handle; /* * Group/Individual bit, in the DSAP. */ #define DSAP_GI_BIT 0x01 /* * Command/Response bit, in the SSAP. * * The low-order bit of the SSAP apparently determines whether this * is a request or a response. (RFC 1390, "Transmission of IP and * ARP over FDDI Networks", says * * Command frames are identified by having the low order * bit of the SSAP address reset to zero. Response frames * have the low order bit of the SSAP address set to one. * * and a page I've seen seems to imply that's part of 802.2.) */ #define SSAP_CR_BIT 0x01 /* * Mask to extrace the SAP number from the DSAP or the SSAP. */ #define SAP_MASK 0xFE /* * These are for SSAP and DSAP, wth last bit always zero. * XXX - some DSAPs come in separate "individual" and "group" versions, * with the last bit 0 and 1, respectively (e.g., LLC Sub-layer Management, * IBM SNA Path Control, IBM Net Management), but, whilst 0xFE is * the ISO Network Layer Protocol, 0xFF is the Global LSAP. */ const value_string sap_vals[] = { { SAP_NULL, "NULL LSAP" }, { SAP_NULL+1, "NULL LSAP" }, { SAP_LLC_SLMGMT, "LLC Sub-Layer Management" }, { SAP_SNA_PATHCTRL, "SNA Path Control" }, { SAP_IP, "TCP/IP" }, { SAP_SNA1, "SNA" }, { SAP_SNA2, "SNA" }, { SAP_PROWAY_NM_INIT, "PROWAY (IEC955) Network Management and Initialization" }, { SAP_NETWARE1, "NetWare (unofficial?)" }, { SAP_OSINL1, "ISO Network Layer (OSLAN 1)" }, { SAP_TI, "Texas Instruments" }, { SAP_OSINL2, "ISO Network Layer (unofficial?)" }, { SAP_OSINL3, "ISO Network Layer (unofficial?)" }, { SAP_BPDU, "Spanning Tree BPDU" }, { SAP_RS511, "EIA RS-511 Manufacturing Message Service" }, { SAP_OSINL4, "ISO Network Layer (OSLAN 2)" }, { SAP_X25, "ISO 8208 (X.25 over 802.2)" }, /* * XXX - setting the group bit of SAP_X25 make 0x7F; is this just * a group version of that? */ { 0x7F, "ISO 802.2" }, { SAP_XNS, "XNS" }, { SAP_BACNET, "BACnet" }, { SAP_NESTAR, "Nestar" }, { SAP_PROWAY_ASLM, "PROWAY (IEC955) Active Station List Maintenance" }, { SAP_ARP, "ARP" }, /* XXX - hand to "dissect_arp()"? */ { SAP_HPJD, "HP JetDirect Printer" }, { SAP_SNAP, "SNAP" }, { SAP_VINES1, "Banyan Vines" }, { SAP_VINES2, "Banyan Vines" }, { SAP_NETWARE2, "NetWare" }, { SAP_NETBIOS, "NetBIOS" }, { SAP_IBMNM, "IBM Net Management" }, { SAP_HPEXT, "HP Extended LLC" }, { SAP_UB, "Ungermann-Bass" }, { SAP_RPL, "Remote Program Load" }, { SAP_OSINL5, "ISO Network Layer" }, { SAP_GLOBAL, "Global LSAP" }, { 0x00, NULL } }; static const value_string format_vals[] = { { 0x81, "LLC basic format" }, { 0, NULL } }; /* * Mask to extract the type from XID frame. */ #define TYPES_MASK 0x1F static const value_string type_vals[] = { { 1, "Type 1 LLC (Class I LLC)" }, { 2, "Type 2 LLC" }, { 3, "Type 1 and Type 2 LLCs (Class II LLC)" }, { 4, "Type 3 LLC" }, { 5, "Type 1 and Type 3 LLCs (Class III LLC)" }, { 6, "Type 2 and Type 3 LLCs" }, { 7, "Type 1 and Type 2 and Type 3 LLCs (Class IV LLC)" }, { 0, NULL } }; /* * Hash table for translating OUIs to an oui_info_t. */ static wmem_map_t *oui_info_table; /* * Decode the SAP value as a bitfield into a string, skipping the GI/CR bit. * Ordinarily, this could be done easily by specifying a bitmask in the * corresponding hf_ entry for the DSAP/SSAP value and simply using a * proto_tree_add_... function to add the item into a proto tree. The * problem is that the proto_tree_add_... functions always bitshift the * value if a bitmask is specified. A SAP value always comprises the entire * octet, however, and must not be shifted. Therefore, using a simple * proto_tree_add_... function to display the topmost 7 bits of the SAP * value as a bitfield produces incorrect results (while the bitfield is * displayed correctly, Wireshark uses the bitshifted value to display the * associated name and for filtering purposes). This function calls a * BASE_CUSTOM routine to decode the SAP value as a bitfield * counter-balancing the bitshift of the original value. */ static void llc_sap_value( char *result, uint32_t sap ) { snprintf( result, ITEM_LABEL_LENGTH, "%s", val_to_str_const(sap<<1, sap_vals, "Unknown")); } /* * Add an entry for a new OUI. */ void llc_add_oui(uint32_t oui, const char *table_name, const char *table_ui_name, hf_register_info *hf_item, const int proto) { oui_info_t *new_info; new_info = wmem_new(wmem_epan_scope(), oui_info_t); new_info->table = register_dissector_table(table_name, table_ui_name, proto, FT_UINT16, BASE_HEX); new_info->field_info = hf_item; /* * Create the hash table for OUI information, if it doesn't * already exist. */ if (oui_info_table == NULL) { oui_info_table = wmem_map_new(wmem_epan_scope(), g_direct_hash, g_direct_equal); } wmem_map_insert(oui_info_table, GUINT_TO_POINTER(oui), new_info); } static bool capture_snap(const unsigned char *pd, int offset, int len, capture_packet_info_t *cpinfo, const union wtap_pseudo_header *pseudo_header _U_) { uint32_t oui; uint16_t etype; if (!BYTES_ARE_IN_FRAME(offset, len, 5)) return false; oui = pd[offset] << 16 | pd[offset+1] << 8 | pd[offset+2]; etype = pntoh16(&pd[offset+3]); switch (oui) { case OUI_ENCAP_ETHER: case OUI_CISCO_90: return try_capture_dissector("ethertype", etype, pd, offset+5, len, cpinfo, pseudo_header); case OUI_CISCO: return try_capture_dissector("ethertype", etype, pd, offset+5, len, cpinfo, pseudo_header); case OUI_MARVELL: /* * OLPC packet. The PID is an Ethertype, but * there's a mesh header between the PID and * the payload. (We assume the header is * 5 bytes, for now). */ return try_capture_dissector("ethertype", etype, pd, offset+5+5, len, cpinfo, pseudo_header); } return false; } static bool capture_llc(const unsigned char *pd, int offset, int len, capture_packet_info_t *cpinfo, const union wtap_pseudo_header *pseudo_header _U_) { int is_snap; uint16_t control; int llc_header_len; if (!BYTES_ARE_IN_FRAME(offset, len, 2)) return false; is_snap = (pd[offset] == SAP_SNAP) && (pd[offset+1] == SAP_SNAP); llc_header_len = 2; /* DSAP + SSAP */ /* * XXX - the page referred to in the comment above about the * Command/Response bit also implies that LLC Type 2 always * uses extended operation, so we don't need to determine * whether it's basic or extended operation; is that the case? */ control = get_xdlc_control(pd, offset+2, pd[offset+1] & SSAP_CR_BIT); llc_header_len += XDLC_CONTROL_LEN(control, true); if (!BYTES_ARE_IN_FRAME(offset, len, llc_header_len)) return false; if (!XDLC_IS_INFORMATION(control)) return false; if (is_snap) return capture_snap(pd, offset+llc_header_len, len, cpinfo, pseudo_header); /* non-SNAP */ return try_capture_dissector("llc.dsap", pd[offset], pd, offset + llc_header_len, len, cpinfo, pseudo_header); } /* Used only for U frames */ static const xdlc_cf_items llc_cf_items = { NULL, NULL, &hf_llc_p, &hf_llc_f, NULL, &hf_llc_u_modifier_cmd, &hf_llc_u_modifier_resp, NULL, &hf_llc_ftype_s_u }; /* Used only for I and S frames */ static const xdlc_cf_items llc_cf_items_ext = { &hf_llc_n_r, &hf_llc_n_s, &hf_llc_p_ext, &hf_llc_f_ext, &hf_llc_s_ftype, NULL, NULL, &hf_llc_ftype_i, &hf_llc_ftype_s_u_ext }; static int dissect_basicxid(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_) { proto_tree *xid_tree = NULL; proto_item *ti = NULL; uint8_t format, types, wsize; col_set_str(pinfo->cinfo, COL_PROTOCOL, "XID"); col_clear(pinfo->cinfo, COL_INFO); format = tvb_get_uint8(tvb, 0); ti = proto_tree_add_item(tree, proto_basicxid, tvb, 0, -1, ENC_NA); xid_tree = proto_item_add_subtree(ti, ett_llc_basicxid); proto_tree_add_uint(xid_tree, hf_llc_xid_format, tvb, 0, 1, format); col_append_str(pinfo->cinfo, COL_INFO, "Basic Format"); types = tvb_get_uint8(tvb, 1); proto_tree_add_uint(xid_tree, hf_llc_xid_types, tvb, 1, 1, types & TYPES_MASK); col_append_fstr(pinfo->cinfo, COL_INFO, "; %s", val_to_str(types & TYPES_MASK, type_vals, "0x%02x") ); wsize = tvb_get_uint8(tvb, 2); proto_tree_add_uint(xid_tree, hf_llc_xid_wsize, tvb, 2, 1, (wsize & 0xFE) >> 1); col_append_fstr(pinfo->cinfo, COL_INFO, "; Window Size %d", (wsize & 0xFE) >> 1); return tvb_captured_length(tvb); } /* * IEEE Std 802.2-1998 and ISO/IEC 8802-2. * * This is what IEEE Std 802-2014 describes in section 5.2.2 "LLC sublayer" * as "LLC protocol discrimination (LPD)". */ static int dissect_llc(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data) { proto_tree *llc_tree; proto_tree *field_tree; proto_item *ti, *sap_item; int is_snap; uint16_t control; int llc_header_len; uint8_t dsap, ssap, format; tvbuff_t *next_tvb; col_set_str(pinfo->cinfo, COL_PROTOCOL, "LLC"); col_clear(pinfo->cinfo, COL_INFO); dsap = tvb_get_uint8(tvb, 0); ti = proto_tree_add_item(tree, proto_llc, tvb, 0, -1, ENC_NA); llc_tree = proto_item_add_subtree(ti, ett_llc); sap_item = proto_tree_add_item(llc_tree, hf_llc_dsap, tvb, 0, 1, ENC_BIG_ENDIAN); field_tree = proto_item_add_subtree(sap_item, ett_llc_dsap); proto_tree_add_item(field_tree, hf_llc_dsap_sap, tvb, 0, 1, ENC_BIG_ENDIAN); proto_tree_add_item(field_tree, hf_llc_dsap_ig, tvb, 0, 1, ENC_NA); ssap = tvb_get_uint8(tvb, 1); sap_item = proto_tree_add_item(llc_tree, hf_llc_ssap, tvb, 1, 1, ENC_BIG_ENDIAN); field_tree = proto_item_add_subtree(sap_item, ett_llc_ssap); proto_tree_add_item(field_tree, hf_llc_ssap_sap, tvb, 1, 1, ENC_BIG_ENDIAN); proto_tree_add_item(field_tree, hf_llc_ssap_cr, tvb, 1, 1, ENC_NA); is_snap = (dsap == SAP_SNAP) && (ssap == SAP_SNAP); llc_header_len = 2; /* DSAP + SSAP */ /* * XXX - the page referred to in the comment above about the * Command/Response bit also implies that LLC Type 2 always * uses extended operation, so we don't need to determine * whether it's basic or extended operation; is that the case? */ control = dissect_xdlc_control(tvb, 2, pinfo, llc_tree, hf_llc_ctrl, ett_llc_ctrl, &llc_cf_items, &llc_cf_items_ext, NULL, NULL, ssap & SSAP_CR_BIT, true, false); llc_header_len += XDLC_CONTROL_LEN(control, true); if (is_snap) llc_header_len += 5; /* 3 bytes of OUI, 2 bytes of protocol ID */ if (tree) proto_item_set_len(ti, llc_header_len); if (is_snap) { dissect_snap(tvb, 2+XDLC_CONTROL_LEN(control, true), pinfo, tree, llc_tree, control, hf_llc_oui, hf_llc_type, hf_llc_pid, 2); } else { col_append_fstr(pinfo->cinfo, COL_INFO, "; DSAP %s %s, SSAP %s %s", val_to_str(dsap & SAP_MASK, sap_vals, "0x%02x"), dsap & DSAP_GI_BIT ? "Group" : "Individual", val_to_str(ssap & SAP_MASK, sap_vals, "0x%02x"), ssap & SSAP_CR_BIT ? "Response" : "Command" ); if (tvb_reported_length_remaining(tvb, llc_header_len) > 0) { next_tvb = tvb_new_subset_remaining(tvb, llc_header_len); if (XDLC_IS_INFORMATION(control)) { /* * Non-SNAP I or UI frame. * Try the regular LLC subdissector table * with the DSAP. */ if (!dissector_try_uint(dsap_subdissector_table, dsap, next_tvb, pinfo, tree)) { call_data_dissector(next_tvb, pinfo, tree); } } else if ((control & (XDLC_U_MODIFIER_MASK|XDLC_U)) == (XDLC_XID|XDLC_U)) { /* * Non-SNAP XID frame. * Test for LLC basic format first */ format = tvb_get_uint8(next_tvb, 0); if (format == 0x81) { dissect_basicxid(next_tvb, pinfo, tree, data); } else { /* * Try the XID LLC subdissector table * with the DSAP. */ if (!dissector_try_uint( xid_subdissector_table, dsap, next_tvb, pinfo, tree)) { call_data_dissector(next_tvb, pinfo, tree); } } } else { if (!dissector_try_uint( other_control_dissector_table, control, next_tvb, pinfo, tree)) { call_data_dissector(next_tvb, pinfo, tree); } } } } return tvb_captured_length(tvb); } /* * Dissect SNAP header; used elsewhere, e.g. in the Frame Relay dissector. */ void dissect_snap(tvbuff_t *tvb, int offset, packet_info *pinfo, proto_tree *tree, proto_tree *snap_tree, int control, int hf_oui, int hf_type, int hf_pid, int bridge_pad) { uint32_t oui; const char *oui_str; uint16_t etype; tvbuff_t *next_tvb; oui_info_t *oui_info; dissector_table_t subdissector_table; int hf; int mesh_header_len; /* * XXX - what about non-UI frames? */ etype = tvb_get_ntohs(tvb, offset+3); proto_tree_add_item_ret_uint(snap_tree, hf_oui, tvb, offset, 3, ENC_BIG_ENDIAN, &oui); oui_str = uint_get_manuf_name_if_known(oui); col_append_fstr(pinfo->cinfo, COL_INFO, "; SNAP, OUI 0x%06X (%s), PID 0x%04X", oui, oui_str ? oui_str : "Unknown", etype); switch (oui) { case OUI_HP_2: /* * We don't use the standard SNAP OUI mechanism here * because that only calls the subdissector for * information frames, and, according to the HP document * at * * http://www.hp.com/sbso/bus_protect/teaming.pdf * * the heartbeats are sent to 03-00-C7-00-00-EE in SNAP * frames in unnumbered TEST frames, not information * frames (numbered or unnumbered). * * See the comment in epan/dissectors/packet-hpteam.c * for more details. */ oui_info = get_snap_oui_info(oui); hf = *oui_info->field_info->p_id; proto_tree_add_uint(snap_tree, hf, tvb, offset+3, 2, etype); next_tvb = tvb_new_subset_remaining(tvb, offset+5); if(!dissector_try_uint(hpteam_subdissector_table,etype, next_tvb, pinfo, tree)) call_data_dissector(next_tvb, pinfo, tree); break; case OUI_ENCAP_ETHER: case OUI_CISCO_90: if (XDLC_IS_INFORMATION(control)) { if (tree) { proto_tree_add_uint(snap_tree, hf_type, tvb, offset+3, 2, etype); } next_tvb = tvb_new_subset_remaining(tvb, offset+5); if (!dissector_try_uint(ethertype_subdissector_table, etype, next_tvb, pinfo, tree)) call_data_dissector(next_tvb, pinfo, tree); } else { next_tvb = tvb_new_subset_remaining(tvb, offset+5); call_data_dissector(next_tvb, pinfo, tree); } break; case OUI_IEEE_802_1: /* * MAC frames bridged over ATM (RFC 2684) or Frame Relay * (RFC 2427). * * We have to figure out how much padding to put * into the frame. We were handed a "bridge_pad" * argument which should be 0 for Frame Relay and * 2 for ATM; we add to that the amount of padding * common to both bridging types. */ if (tree) { proto_tree_add_uint(snap_tree, hf_pid, tvb, offset+3, 2, etype); } switch (etype) { case BPID_ETH_WITH_FCS: next_tvb = tvb_new_subset_remaining(tvb, offset+5+bridge_pad); call_dissector(eth_withfcs_handle, next_tvb, pinfo, tree); break; case BPID_ETH_WITHOUT_FCS: next_tvb = tvb_new_subset_remaining(tvb, offset+5+bridge_pad); call_dissector(eth_withoutfcs_handle, next_tvb, pinfo, tree); break; case BPID_802_5_WITH_FCS: case BPID_802_5_WITHOUT_FCS: /* * We treat the last padding byte as the Access * Control byte, as that's what the Token * Ring dissector expects the first byte to * be. */ next_tvb = tvb_new_subset_remaining(tvb, offset+5+bridge_pad); call_dissector(tr_handle, next_tvb, pinfo, tree); break; case BPID_FDDI_WITH_FCS: case BPID_FDDI_WITHOUT_FCS: next_tvb = tvb_new_subset_remaining(tvb, offset+5+1+bridge_pad); call_dissector(fddi_handle, next_tvb, pinfo, tree); break; case BPID_BPDU: next_tvb = tvb_new_subset_remaining(tvb, offset+5); call_dissector(bpdu_handle, next_tvb, pinfo, tree); break; default: next_tvb = tvb_new_subset_remaining(tvb, offset+5); call_data_dissector(next_tvb, pinfo, tree); break; } break; case OUI_CABLE_BPDU: /* DOCSIS cable modem spanning tree BPDU */ if (tree) { proto_tree_add_uint(snap_tree, hf_pid, tvb, offset+3, 2, etype); } next_tvb = tvb_new_subset_remaining(tvb, offset+5); call_dissector(bpdu_handle, next_tvb, pinfo, tree); break; case OUI_TURBOCELL: next_tvb = tvb_new_subset_remaining(tvb, offset+3); call_dissector(turbo_handle, next_tvb, pinfo, tree); break; case OUI_MARVELL: /* * OLPC packet. The PID is an Ethertype, but * there's a mesh header between the PID and * the payload. */ if (XDLC_IS_INFORMATION(control)) { if (tree) { proto_tree_add_uint(snap_tree, hf_type, tvb, offset+3, 2, etype); } next_tvb = tvb_new_subset_remaining(tvb, offset+5); mesh_header_len = call_dissector(mesh_handle, next_tvb, pinfo, tree); next_tvb = tvb_new_subset_remaining(tvb, offset+5+mesh_header_len); if (!dissector_try_uint(ethertype_subdissector_table, etype, next_tvb, pinfo, tree)) call_data_dissector(next_tvb, pinfo, tree); } else { next_tvb = tvb_new_subset_remaining(tvb, offset+5); call_data_dissector(next_tvb, pinfo, tree); } break; default: /* * Do we have information for this OUI? */ oui_info = get_snap_oui_info(oui); if (oui_info != NULL) { /* * Yes - use it. */ hf = *oui_info->field_info->p_id; subdissector_table = oui_info->table; } else { /* * No, use hf_pid for the PID and just dissect * the payload as data. */ hf = hf_pid; subdissector_table = NULL; } if (tree) { proto_tree_add_uint(snap_tree, hf, tvb, offset+3, 2, etype); } next_tvb = tvb_new_subset_remaining(tvb, offset+5); if (XDLC_IS_INFORMATION(control)) { if (subdissector_table != NULL) { /* do lookup with the subdissector table */ if (dissector_try_uint(subdissector_table, etype, next_tvb, pinfo, tree)) break; } } call_data_dissector(next_tvb, pinfo, tree); break; } } /* * Return the oui_info_t for the PID for a particular OUI value, or NULL * if there isn't one. */ oui_info_t * get_snap_oui_info(uint32_t oui) { if (oui_info_table != NULL) { return (oui_info_t *)wmem_map_lookup(oui_info_table, GUINT_TO_POINTER(oui)); } else return NULL; } /* * This is what IEEE Std 802-2014 describes in section 5.2.2 "LLC sublayer" * as "EtherType protocol discrimination (EPD)". */ static int dissect_epd_llc(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_) { proto_tree *llc_tree; proto_item *ti; uint32_t etype; tvbuff_t *next_tvb; col_set_str(pinfo->cinfo, COL_PROTOCOL, "LLC"); col_clear(pinfo->cinfo, COL_INFO); ti = proto_tree_add_item(tree, proto_llc, tvb, 0, 2, ENC_NA); llc_tree = proto_item_add_subtree(ti, ett_llc); proto_tree_add_item_ret_uint(llc_tree, hf_llc_type, tvb, 0, 2, ENC_BIG_ENDIAN, &etype); next_tvb = tvb_new_subset_remaining(tvb, 2); if (dissector_try_uint(ethertype_subdissector_table, etype, next_tvb, pinfo, tree) == 0) call_data_dissector(next_tvb, pinfo, tree); return tvb_captured_length(tvb); } void proto_register_llc(void) { static struct true_false_string ig_bit = { "Group", "Individual" }; static struct true_false_string cr_bit = { "Response", "Command" }; static hf_register_info hf[] = { { &hf_llc_dsap, { "DSAP", "llc.dsap", FT_UINT8, BASE_HEX, VALS(sap_vals), 0x0, "Destination Service Access Point", HFILL }}, { &hf_llc_dsap_sap, { "SAP", "llc.dsap.sap", FT_UINT8, BASE_CUSTOM, CF_FUNC(llc_sap_value), 0xFE, "Service Access Point", HFILL }}, { &hf_llc_dsap_ig, { "IG Bit", "llc.dsap.ig", FT_BOOLEAN, 8, TFS(&ig_bit), DSAP_GI_BIT, "Individual/Group", HFILL }}, { &hf_llc_ssap, { "SSAP", "llc.ssap", FT_UINT8, BASE_HEX, VALS(sap_vals), 0x0, "Source Service Access Point", HFILL }}, { &hf_llc_ssap_sap, { "SAP", "llc.ssap.sap", FT_UINT8, BASE_CUSTOM, CF_FUNC(llc_sap_value), 0xFE, "Service Access Point", HFILL }}, { &hf_llc_ssap_cr, { "CR Bit", "llc.ssap.cr", FT_BOOLEAN, 8, TFS(&cr_bit), SSAP_CR_BIT, "Command/Response", HFILL }}, { &hf_llc_ctrl, { "Control", "llc.control", FT_UINT16, BASE_HEX, NULL, 0x0, NULL, HFILL }}, { &hf_llc_n_r, { "N(R)", "llc.control.n_r", FT_UINT16, BASE_DEC, NULL, XDLC_N_R_EXT_MASK, NULL, HFILL }}, { &hf_llc_n_s, { "N(S)", "llc.control.n_s", FT_UINT16, BASE_DEC, NULL, XDLC_N_S_EXT_MASK, NULL, HFILL }}, { &hf_llc_p, { "Poll", "llc.control.p", FT_BOOLEAN, 8, TFS(&tfs_set_notset), XDLC_P_F, NULL, HFILL }}, { &hf_llc_p_ext, { "Poll", "llc.control.p", FT_BOOLEAN, 16, TFS(&tfs_set_notset), XDLC_P_F_EXT, NULL, HFILL }}, { &hf_llc_f, { "Final", "llc.control.f", FT_BOOLEAN, 8, TFS(&tfs_set_notset), XDLC_P_F, NULL, HFILL }}, { &hf_llc_f_ext, { "Final", "llc.control.f", FT_BOOLEAN, 16, TFS(&tfs_set_notset), XDLC_P_F_EXT, NULL, HFILL }}, { &hf_llc_s_ftype, { "Supervisory frame type", "llc.control.s_ftype", FT_UINT16, BASE_HEX, VALS(stype_vals), XDLC_S_FTYPE_MASK, NULL, HFILL }}, { &hf_llc_u_modifier_cmd, { "Command", "llc.control.u_modifier_cmd", FT_UINT8, BASE_HEX, VALS(modifier_vals_cmd), XDLC_U_MODIFIER_MASK, NULL, HFILL }}, { &hf_llc_u_modifier_resp, { "Response", "llc.control.u_modifier_resp", FT_UINT8, BASE_HEX, VALS(modifier_vals_resp), XDLC_U_MODIFIER_MASK, NULL, HFILL }}, { &hf_llc_ftype_i, { "Frame type", "llc.control.ftype", FT_UINT16, BASE_HEX, VALS(ftype_vals), XDLC_I_MASK, NULL, HFILL }}, { &hf_llc_ftype_s_u, { "Frame type", "llc.control.ftype", FT_UINT8, BASE_HEX, VALS(ftype_vals), XDLC_S_U_MASK, NULL, HFILL }}, { &hf_llc_ftype_s_u_ext, { "Frame type", "llc.control.ftype", FT_UINT16, BASE_HEX, VALS(ftype_vals), XDLC_S_U_MASK, NULL, HFILL }}, /* registered here but handled in ethertype.c */ { &hf_llc_type, { "Type", "llc.type", FT_UINT16, BASE_HEX, VALS(etype_vals), 0x0, NULL, HFILL }}, { &hf_llc_oui, { "Organization Code", "llc.oui", FT_UINT24, BASE_OUI, NULL, 0x0, NULL, HFILL }}, { &hf_llc_pid, { "Protocol ID", "llc.pid", FT_UINT16, BASE_HEX, NULL, 0x0, NULL, HFILL }} }; static int *ett[] = { &ett_llc, &ett_llc_dsap, &ett_llc_ssap, &ett_llc_ctrl, }; proto_llc = proto_register_protocol("Logical-Link Control", "LLC", "llc"); proto_register_field_array(proto_llc, hf, array_length(hf)); proto_register_subtree_array(ett, array_length(ett)); /* subdissector code */ dsap_subdissector_table = register_dissector_table("llc.dsap", "LLC SAP", proto_llc, FT_UINT8, BASE_HEX); xid_subdissector_table = register_dissector_table("llc.xid_dsap", "LLC XID SAP", proto_llc, FT_UINT8, BASE_HEX); other_control_dissector_table = register_dissector_table("llc.control", "LLC Control", proto_llc, FT_UINT16, BASE_HEX); register_capture_dissector_table("llc.dsap", "LLC"); llc_handle = register_dissector("llc", dissect_llc, proto_llc); epd_llc_handle = register_dissector("epd_llc", dissect_epd_llc, proto_llc); register_capture_dissector("llc", capture_llc, proto_llc); } void proto_register_basicxid(void) { static hf_register_info hf[] = { { &hf_llc_xid_format, { "XID Format", "basicxid.llc.xid.format", FT_UINT8, BASE_HEX, VALS(format_vals), 0x0, NULL, HFILL }}, { &hf_llc_xid_types, { "LLC Types/Classes", "basicxid.llc.xid.types", FT_UINT8, BASE_HEX, VALS(type_vals), 0x0, NULL, HFILL }}, { &hf_llc_xid_wsize, { "Receive Window Size", "basicxid.llc.xid.wsize", FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL }} }; static int *ett[] = { &ett_llc_basicxid }; proto_basicxid = proto_register_protocol("Logical-Link Control Basic Format XID", "Basic Format XID", "basicxid"); proto_register_field_array(proto_basicxid, hf, array_length(hf)); proto_register_subtree_array(ett, array_length(ett)); register_dissector("basicxid", dissect_basicxid, proto_basicxid); } static void register_hf(void *key _U_, void *value, void *user_data _U_) { oui_info_t *info = (oui_info_t *)value; proto_register_field_array(proto_llc, info->field_info, 1); } void proto_reg_handoff_llc(void) { capture_dissector_handle_t llc_cap_handle; capture_dissector_handle_t llc_snap_handle; /* * Get handles for the BPDU, Ethernet, FDDI, Token Ring and * Turbocell dissectors. */ bpdu_handle = find_dissector_add_dependency("bpdu", proto_llc); eth_withoutfcs_handle = find_dissector_add_dependency("eth_withoutfcs", proto_llc); eth_withfcs_handle = find_dissector_add_dependency("eth_withfcs", proto_llc); fddi_handle = find_dissector_add_dependency("fddi", proto_llc); tr_handle = find_dissector_add_dependency("tr", proto_llc); turbo_handle = find_dissector_add_dependency("turbocell", proto_llc); mesh_handle = find_dissector_add_dependency("mesh", proto_llc); /* * Get the Ethertype dissector table. */ ethertype_subdissector_table = find_dissector_table("ethertype"); hpteam_subdissector_table = find_dissector_table("llc.hpteam_pid"); dissector_add_uint("wtap_encap", WTAP_ENCAP_ATM_RFC1483, llc_handle); dissector_add_uint("sll.ltype", LINUX_SLL_P_802_2, llc_handle); /* RFC 2043 */ dissector_add_uint("ppp.protocol", PPP_LLC, llc_handle); /* RFC 2353 */ dissector_add_uint_range_with_preference("udp.port", UDP_PORT_LLC_RANGE, llc_handle); /* IP-over-FC when we have the full FC frame */ dissector_add_uint("fc.ftype", FC_FTYPE_IP, llc_handle); dissector_add_uint("atm.aal5.type", TRAF_LLCMX, llc_handle); /* * BACNET-over-ARCNET is really BACNET-over-802.2 LLC-over-ARCNET, * apparently. */ dissector_add_uint("arcnet.protocol_id", ARCNET_PROTO_BACNET, llc_handle); dissector_add_uint("ethertype", ETHERTYPE_JUMBO_LLC, llc_handle); dissector_add_uint("juniper.proto", JUNIPER_PROTO_LLC, llc_handle); dissector_add_uint("juniper.proto", JUNIPER_PROTO_LLC_SNAP, llc_handle); llc_cap_handle = find_capture_dissector("llc"); capture_dissector_add_uint("ethertype", ETHERTYPE_JUMBO_LLC, llc_cap_handle); capture_dissector_add_uint("atm.aal5.type", TRAF_LLCMX, llc_cap_handle); capture_dissector_add_uint("sll.ltype", LINUX_SLL_P_802_2, llc_cap_handle); llc_snap_handle = register_capture_dissector("llc_snap", capture_snap, proto_llc); capture_dissector_add_uint("fr.nlpid", NLPID_SNAP, llc_snap_handle); /* * Register all the fields for PIDs for various OUIs. */ if (oui_info_table != NULL) wmem_map_foreach(oui_info_table, register_hf, NULL); } /* * Editor modelines - https://www.wireshark.org/tools/modelines.html * * Local variables: * c-basic-offset: 8 * tab-width: 8 * indent-tabs-mode: t * End: * * vi: set shiftwidth=8 tabstop=8 noexpandtab: * :indentSize=8:tabSize=8:noTabs=false: */