diff options
Diffstat (limited to 'epan/dissectors/packet-pppoe.c')
| -rw-r--r-- | epan/dissectors/packet-pppoe.c | 1308 |
1 files changed, 1308 insertions, 0 deletions
diff --git a/epan/dissectors/packet-pppoe.c b/epan/dissectors/packet-pppoe.c new file mode 100644 index 00000000..e0b54a95 --- /dev/null +++ b/epan/dissectors/packet-pppoe.c @@ -0,0 +1,1308 @@ +/* packet-pppoe.c + * Routines for PPP Over Ethernet (PPPoE) packet disassembly (RFC2516) + * Up to date with http://www.iana.org/assignments/pppoe-parameters (2008-04-30) + * + * Wireshark - Network traffic analyzer + * By Gerald Combs <gerald@wireshark.org> + * Copyright 1998 Gerald Combs + * + * SPDX-License-Identifier: GPL-2.0-or-later + */ + +#include "config.h" + +#include <epan/packet.h> +#include <epan/etypes.h> +#include <epan/prefs.h> +#include <epan/expert.h> +#include <epan/ppptypes.h> +#include <wiretap/wtap.h> + +void proto_register_pppoed(void); +void proto_reg_handoff_pppoed(void); +void proto_register_pppoes(void); +void proto_register_pppoe(void); +void proto_reg_handoff_pppoes(void); + +static dissector_handle_t pppoed_handle; +static dissector_handle_t pppoes_handle; + +static int proto_pppoed = -1; + +/* Common to session and discovery protocols */ +static gint hf_pppoe_version = -1; +static gint hf_pppoe_type = -1; +static gint hf_pppoe_code = -1; +static gint hf_pppoe_session_id = -1; +static gint hf_pppoe_payload_length = -1; + +/* Discovery protocol fields */ +static gint hf_pppoed_tags = -1; +static gint hf_pppoed_tag = -1; +static gint hf_pppoed_tag_length = -1; +static gint hf_pppoed_tag_length_8 = -1; +static gint hf_pppoed_tag_unknown_data = -1; +static gint hf_pppoed_tag_service_name = -1; +static gint hf_pppoed_tag_ac_name = -1; +static gint hf_pppoed_tag_host_uniq = -1; +static gint hf_pppoed_tag_ac_cookie = -1; +static gint hf_pppoed_tag_vendor_id = -1; +static gint hf_pppoed_tag_vendor_unspecified = -1; +static gint hf_pppoed_tag_vspec_tags = -1; +static gint hf_pppoed_tag_vspec_tag = -1; +static gint hf_pppoed_tag_vspec_circuit_id = -1; +static gint hf_pppoed_tag_vspec_remote_id = -1; +static gint hf_pppoed_tag_vspec_act_data_rate_up = -1; +static gint hf_pppoed_tag_vspec_act_data_rate_down = -1; +static gint hf_pppoed_tag_vspec_min_data_rate_up = -1; +static gint hf_pppoed_tag_vspec_min_data_rate_down = -1; +static gint hf_pppoed_tag_vspec_attainable_data_rate_up = -1; +static gint hf_pppoed_tag_vspec_attainable_data_rate_down = -1; +static gint hf_pppoed_tag_vspec_max_data_rate_up = -1; +static gint hf_pppoed_tag_vspec_max_data_rate_down = -1; +static gint hf_pppoed_tag_vspec_min_data_rate_up_lp = -1; +static gint hf_pppoed_tag_vspec_min_data_rate_down_lp = -1; +static gint hf_pppoed_tag_vspec_max_int_delay_up = -1; +static gint hf_pppoed_tag_vspec_act_int_delay_up = -1; +static gint hf_pppoed_tag_vspec_max_int_delay_down = -1; +static gint hf_pppoed_tag_vspec_act_int_delay_down = -1; +static gint hf_pppoed_tag_vspec_access_loop_encapsulation = -1; +static gint hf_pppoed_tag_vspec_access_loop_encap_data_link = -1; +static gint hf_pppoed_tag_vspec_access_loop_encap_encap_1 = -1; +static gint hf_pppoed_tag_vspec_access_loop_encap_encap_2 = -1; +static gint hf_pppoed_tag_credits = -1; +static gint hf_pppoed_tag_credits_fcn = -1; +static gint hf_pppoed_tag_credits_bcn = -1; +static gint hf_pppoed_tag_metrics = -1; +static gint hf_pppoed_tag_metrics_r = -1; +static gint hf_pppoed_tag_metrics_rlq = -1; +static gint hf_pppoed_tag_metrics_resource = -1; +static gint hf_pppoed_tag_metrics_latency = -1; +static gint hf_pppoed_tag_metrics_curr_drate = -1; +static gint hf_pppoed_tag_metrics_max_drate = -1; +static gint hf_pppoed_tag_mdr_units = -1; +static gint hf_pppoed_tag_cdr_units = -1; +static gint hf_pppoed_tag_seq_num = -1; +static gint hf_pppoed_tag_cred_scale = -1; +static gint hf_pppoed_tag_relay_session_id = -1; +static gint hf_pppoed_tag_hurl = -1; +static gint hf_pppoed_tag_motm = -1; +static gint hf_pppoed_tag_max_payload = -1; +static gint hf_pppoed_tag_ip_route_add = -1; +static gint hf_pppoed_tag_service_name_error = -1; +static gint hf_pppoed_tag_ac_system_error = -1; +static gint hf_pppoed_tag_generic_error = -1; + +/* Session protocol fields */ +static gint hf_pppoes_tags = -1; +/* static gint hf_pppoes_tag = -1; */ +/* static gint hf_pppoes_tag_credits = -1; */ +static gint hf_pppoes_tag_credits_fcn = -1; +static gint hf_pppoes_tag_credits_bcn = -1; + +/* Session protocol fields */ + +static gint ett_pppoed = -1; +static gint ett_pppoed_tags = -1; +static gint ett_pppoed_tag_vspec_dslf_access_loop_encaps = -1; + +static int proto_pppoes = -1; + +static gint ett_pppoes = -1; +static gint ett_pppoes_tags = -1; + +static expert_field ei_pppoe_payload_length = EI_INIT; +static expert_field ei_pppoe_tag_length = EI_INIT; + +/* PPPoE parent fields */ + +static int proto_pppoe = -1; +static gint ett_pppoe = -1; + + +/* Handle for calling for ppp dissector to handle session data */ +static dissector_handle_t ppp_handle; + + +/* Preference for showing discovery tag values and lengths */ +static gboolean global_pppoe_show_tags_and_lengths = FALSE; + + +#define PPPOE_CODE_SESSION 0x00 +#define PPPOE_CODE_PADO 0x07 +#define PPPOE_CODE_PADI 0x09 +#define PPPOE_CODE_PADG 0x0a +#define PPPOE_CODE_PADC 0x0b +#define PPPOE_CODE_PADQ 0x0c +#define PPPOE_CODE_PADR 0x19 +#define PPPOE_CODE_PADS 0x65 +#define PPPOE_CODE_PADT 0xa7 +#define PPPOE_CODE_PADM 0xd3 +#define PPPOE_CODE_PADN 0xd4 + +#define PPPOE_TAG_EOL 0x0000 +#define PPPOE_TAG_SVC_NAME 0x0101 +#define PPPOE_TAG_AC_NAME 0x0102 +#define PPPOE_TAG_HOST_UNIQ 0x0103 +#define PPPOE_TAG_AC_COOKIE 0x0104 +#define PPPOE_TAG_VENDOR 0x0105 +#define PPPOE_TAG_CREDITS 0x0106 +#define PPPOE_TAG_METRICS 0x0107 +#define PPPOE_TAG_SEQ_NUM 0x0108 +#define PPPOE_TAG_CRED_SCALE 0x0109 +#define PPPOE_TAG_RELAY_ID 0x0110 +#define PPPOE_TAG_HURL 0x0111 +#define PPPOE_TAG_MOTM 0x0112 +#define PPPOE_TAG_MAX_PAYLD 0x0120 +#define PPPOE_TAG_IP_RT_ADD 0x0121 +#define PPPOE_TAG_SVC_ERR 0x0201 +#define PPPOE_TAG_AC_ERR 0x0202 +#define PPPOE_TAG_GENERIC_ERR 0x0203 + +#define PPPOE_VENDOR_ID_DSLF 3561 + +#define PPPOE_TAG_VSPEC_DSLF_CIRCUIT_ID 0x01 +#define PPPOE_TAG_VSPEC_DSLF_REMOTE_ID 0x02 +#define PPPOE_TAG_VSPEC_DSLF_ACT_DATA_RATE_UP 0x81 +#define PPPOE_TAG_VSPEC_DSLF_ACT_DATA_RATE_DOWN 0x82 +#define PPPOE_TAG_VSPEC_DSLF_MIN_DATA_RATE_UP 0x83 +#define PPPOE_TAG_VSPEC_DSLF_MIN_DATA_RATE_DOWN 0x84 +#define PPPOE_TAG_VSPEC_DSLF_ATTAINABLE_DATA_RATE_UP 0x85 +#define PPPOE_TAG_VSPEC_DSLF_ATTAINABLE_DATA_RATE_DOWN 0x86 +#define PPPOE_TAG_VSPEC_DSLF_MAX_DATA_RATE_UP 0x87 +#define PPPOE_TAG_VSPEC_DSLF_MAX_DATA_RATE_DOWN 0x88 +#define PPPOE_TAG_VSPEC_DSLF_MIN_DATA_RATE_UP_LP 0x89 +#define PPPOE_TAG_VSPEC_DSLF_MIN_DATA_RATE_DOWN_LP 0x8a +#define PPPOE_TAG_VSPEC_DSLF_MAX_INT_DELAY_UP 0x8b +#define PPPOE_TAG_VSPEC_DSLF_ACT_INT_DELAY_UP 0x8c +#define PPPOE_TAG_VSPEC_DSLF_MAX_INT_DELAY_DOWN 0x8d +#define PPPOE_TAG_VSPEC_DSLF_ACT_INT_DELAY_DOWN 0x8e +#define PPPOE_TAG_VSPEC_DSLF_ACCESS_LOOP_ENCAPSULATION 0x90 + +#define PPPOE_TAG_VSPEC_DSLF_ACCESS_LOOP_ENCAP_DATA_LINK_ATM 0x00 +#define PPPOE_TAG_VSPEC_DSLF_ACCESS_LOOP_ENCAP_DATA_LINK_ETH 0x01 + +#define PPPOE_TAG_VSPEC_DSLF_ACCESS_LOOP_ENCAP_ENCAPS_1_NA 0x00 +#define PPPOE_TAG_VSPEC_DSLF_ACCESS_LOOP_ENCAP_ENCAPS_1_UNTAGGED_ETH 0x01 +#define PPPOE_TAG_VSPEC_DSLF_ACCESS_LOOP_ENCAP_ENCAPS_1_SINGLE_TAGGED_ETH 0x02 +#define PPPOE_TAG_VSPEC_DSLF_ACCESS_LOOP_ENCAP_ENCAPS_1_DOUBLE_TAGGED_ETH 0x03 + +#define PPPOE_TAG_VSPEC_DSLF_ACCESS_LOOP_ENCAP_ENCAPS_2_NA 0x00 +#define PPPOE_TAG_VSPEC_DSLF_ACCESS_LOOP_ENCAP_ENCAPS_2_PPPOA_LLC 0x01 +#define PPPOE_TAG_VSPEC_DSLF_ACCESS_LOOP_ENCAP_ENCAPS_2_PPPOA_NULL 0x02 +#define PPPOE_TAG_VSPEC_DSLF_ACCESS_LOOP_ENCAP_ENCAPS_2_IPOA_LLC 0x03 +#define PPPOE_TAG_VSPEC_DSLF_ACCESS_LOOP_ENCAP_ENCAPS_2_IPOA_NULL 0x04 +#define PPPOE_TAG_VSPEC_DSLF_ACCESS_LOOP_ENCAP_ENCAPS_2_ETH_OVER_AAL5_LLC_WITH_FCS 0x05 +#define PPPOE_TAG_VSPEC_DSLF_ACCESS_LOOP_ENCAP_ENCAPS_2_ETH_OVER_AAL5_LLC_WITHOUT_FCS 0x06 +#define PPPOE_TAG_VSPEC_DSLF_ACCESS_LOOP_ENCAP_ENCAPS_2_ETH_OVER_AAL5_NULL_WITH_FCS 0x07 +#define PPPOE_TAG_VSPEC_DSLF_ACCESS_LOOP_ENCAP_ENCAPS_2_ETH_OVER_AAL5_NULL_WITHOUT_FCS 0x08 + +#define PPPOE_CDR_MASK 0x0006 +#define PPPOE_MDR_MASK 0x0018 +#define PPPOE_RCV_ONLY_MASK 0x0001 + +#define PPPOE_SCALE_KBPS 0x00 +#define PPPOE_SCALE_MBPS 0x01 +#define PPPOE_SCALE_GBPS 0x02 +#define PPPOE_SCALE_TBPS 0x03 + + +static const value_string code_vals[] = { + {PPPOE_CODE_SESSION, "Session Data" }, + {PPPOE_CODE_PADO, "Active Discovery Offer (PADO)" }, + {PPPOE_CODE_PADI, "Active Discovery Initiation (PADI)" }, + {PPPOE_CODE_PADG, "Active Discovery Session-Grant (PADG)" }, + {PPPOE_CODE_PADC, "Active Discovery Session-Credit Resp.(PADC)" }, + {PPPOE_CODE_PADQ, "Active Discovery Quality (PADQ)" }, + {PPPOE_CODE_PADR, "Active Discovery Request (PADR)" }, + {PPPOE_CODE_PADS, "Active Discovery Session-confirmation (PADS)"}, + {PPPOE_CODE_PADT, "Active Discovery Terminate (PADT)" }, + {PPPOE_CODE_PADM, "Active Discovery Message (PADM)" }, + {PPPOE_CODE_PADN, "Active Discovery Network (PADN)" }, + {0, NULL } +}; + + +static const value_string tag_vals[] = { + {PPPOE_TAG_EOL, "End-Of-List" }, + {PPPOE_TAG_SVC_NAME, "Service-Name" }, + {PPPOE_TAG_AC_NAME, "AC-Name" }, + {PPPOE_TAG_HOST_UNIQ, "Host-Uniq" }, + {PPPOE_TAG_AC_COOKIE, "AC-Cookie" }, + {PPPOE_TAG_VENDOR, "Vendor-Specific" }, + {PPPOE_TAG_CREDITS, "Credits" }, + {PPPOE_TAG_METRICS, "Metrics" }, + {PPPOE_TAG_SEQ_NUM, "Sequence Number" }, + {PPPOE_TAG_CRED_SCALE, "Credit Scale Factor"}, + {PPPOE_TAG_RELAY_ID, "Relay-Session-Id" }, + {PPPOE_TAG_HURL, "HURL" }, + {PPPOE_TAG_MOTM, "MOTM" }, + {PPPOE_TAG_MAX_PAYLD, "PPP-Max-Payload" }, + {PPPOE_TAG_IP_RT_ADD, "IP Route Add" }, + {PPPOE_TAG_SVC_ERR, "Service-Name-Error"}, + {PPPOE_TAG_AC_ERR, "AC-System-Error" }, + {PPPOE_TAG_GENERIC_ERR,"Generic-Error" }, + {0, NULL } +}; + +static const value_string vspec_tag_vals[] = { + {PPPOE_TAG_VSPEC_DSLF_CIRCUIT_ID, "Circuit-ID" }, + {PPPOE_TAG_VSPEC_DSLF_REMOTE_ID, "Remote-ID" }, + {PPPOE_TAG_VSPEC_DSLF_ACT_DATA_RATE_UP, "Actual-Data-Rate-Up" }, + {PPPOE_TAG_VSPEC_DSLF_ACT_DATA_RATE_DOWN, "Actual-Data-Rate-Down" }, + {PPPOE_TAG_VSPEC_DSLF_MIN_DATA_RATE_UP, "Min-Data-Rate-Up" }, + {PPPOE_TAG_VSPEC_DSLF_MIN_DATA_RATE_DOWN, "Min-Data-Rate-Down" }, + {PPPOE_TAG_VSPEC_DSLF_ATTAINABLE_DATA_RATE_UP, "Attainable-Data-Rate-Up" }, + {PPPOE_TAG_VSPEC_DSLF_ATTAINABLE_DATA_RATE_DOWN, "Attainable-Data-Rate-Down" }, + {PPPOE_TAG_VSPEC_DSLF_MAX_DATA_RATE_UP, "Max-Data-Rate-Up" }, + {PPPOE_TAG_VSPEC_DSLF_MAX_DATA_RATE_DOWN, "Max-Data-Rate-Down" }, + {PPPOE_TAG_VSPEC_DSLF_MIN_DATA_RATE_UP_LP, "Min-Data-Rate-Up-Low-Power" }, + {PPPOE_TAG_VSPEC_DSLF_MIN_DATA_RATE_DOWN_LP, "Min-Data-Rate-Down-Low-Power" }, + {PPPOE_TAG_VSPEC_DSLF_MAX_INT_DELAY_UP, "Max-Interleaving-Delay-Up" }, + {PPPOE_TAG_VSPEC_DSLF_ACT_INT_DELAY_UP, "Actual-Interleaving-Delay-Up" }, + {PPPOE_TAG_VSPEC_DSLF_MAX_INT_DELAY_DOWN, "Max-Interleaving-Delay-Down" }, + {PPPOE_TAG_VSPEC_DSLF_ACT_INT_DELAY_DOWN, "Actual-Interleaving-Delay-Down"}, + {PPPOE_TAG_VSPEC_DSLF_ACCESS_LOOP_ENCAPSULATION, "Access-Loop-Encapsulation" }, + {0, NULL } +}; + +static const value_string vspec_tag_dslf_access_loop_encap_data_link_vals[] = { + {PPPOE_TAG_VSPEC_DSLF_ACCESS_LOOP_ENCAP_DATA_LINK_ATM, "ATM AAL5"}, + {PPPOE_TAG_VSPEC_DSLF_ACCESS_LOOP_ENCAP_DATA_LINK_ETH, "Ethernet"}, + {0, NULL } +}; + +static const value_string vspec_tag_dslf_access_loop_encap_encap_1_vals[] = { + {PPPOE_TAG_VSPEC_DSLF_ACCESS_LOOP_ENCAP_ENCAPS_1_NA, "NA" }, + {PPPOE_TAG_VSPEC_DSLF_ACCESS_LOOP_ENCAP_ENCAPS_1_UNTAGGED_ETH, "Untagged Ethernet" }, + {PPPOE_TAG_VSPEC_DSLF_ACCESS_LOOP_ENCAP_ENCAPS_1_SINGLE_TAGGED_ETH, "Single-tagged Ethernet"}, + {PPPOE_TAG_VSPEC_DSLF_ACCESS_LOOP_ENCAP_ENCAPS_1_DOUBLE_TAGGED_ETH, "Double-tagged Ethernet"}, + {0, NULL } +}; + +static const value_string vspec_tag_dslf_access_loop_encap_encap_2_vals[] = { + {PPPOE_TAG_VSPEC_DSLF_ACCESS_LOOP_ENCAP_ENCAPS_2_NA, "NA" }, + {PPPOE_TAG_VSPEC_DSLF_ACCESS_LOOP_ENCAP_ENCAPS_2_PPPOA_LLC, "PPPoA LLC" }, + {PPPOE_TAG_VSPEC_DSLF_ACCESS_LOOP_ENCAP_ENCAPS_2_PPPOA_NULL, "PPPoA Null" }, + {PPPOE_TAG_VSPEC_DSLF_ACCESS_LOOP_ENCAP_ENCAPS_2_IPOA_LLC, "IPoA LLC" }, + {PPPOE_TAG_VSPEC_DSLF_ACCESS_LOOP_ENCAP_ENCAPS_2_IPOA_NULL, "IPoA Null" }, + {PPPOE_TAG_VSPEC_DSLF_ACCESS_LOOP_ENCAP_ENCAPS_2_ETH_OVER_AAL5_LLC_WITH_FCS, "Ethernet over AAL5 LLC w FCS" }, + {PPPOE_TAG_VSPEC_DSLF_ACCESS_LOOP_ENCAP_ENCAPS_2_ETH_OVER_AAL5_LLC_WITHOUT_FCS, "Ethernet over AAL5 LLC w/o FCS" }, + {PPPOE_TAG_VSPEC_DSLF_ACCESS_LOOP_ENCAP_ENCAPS_2_ETH_OVER_AAL5_NULL_WITH_FCS, "Ethernet over AAL5 Null w FCS" }, + {PPPOE_TAG_VSPEC_DSLF_ACCESS_LOOP_ENCAP_ENCAPS_2_ETH_OVER_AAL5_NULL_WITHOUT_FCS,"Ethernet over AAL5 Null w/o FCS"}, + {0, NULL } +}; + +static const value_string datarate_scale_vals[] = { + {PPPOE_SCALE_KBPS, "kilobits per second"}, + {PPPOE_SCALE_MBPS, "megabits per second"}, + {PPPOE_SCALE_GBPS, "gigabits per second"}, + {PPPOE_SCALE_TBPS, "terabits per second"}, + {0, NULL } +}; + + +#define CASE_VSPEC_DSLF_TAG_UINT(tag_name, relation, length, hf_var) case tag_name: \ + if (!(poe_tag_length relation length)) { \ + expert_add_info_format(pinfo, pppoe_tree, &ei_pppoe_tag_length, \ + "%s: Wrong length: %u (expected %s %d)", \ + val_to_str_const(poe_tag, vspec_tag_vals, "Unknown"), poe_tag_length, #relation, length); \ + } else { \ + proto_tree_add_item(pppoe_tree, hf_var, tvb, \ + tagstart+2, poe_tag_length, ENC_BIG_ENDIAN); \ + } \ + break; + +#define CASE_VSPEC_DSLF_TAG_STRING(tag_name, relation, length, hf_var) case tag_name: \ + if (!(poe_tag_length relation length)) { \ + expert_add_info_format(pinfo, pppoe_tree, &ei_pppoe_tag_length, \ + "%s: Wrong length: %u (expected %s %d)", \ + val_to_str_const(poe_tag, vspec_tag_vals, "Unknown"), poe_tag_length, #relation, length); \ + } else { \ + proto_tree_add_item(pppoe_tree, hf_var, tvb, \ + tagstart+2, poe_tag_length, ENC_ASCII|ENC_NA); \ + } \ + break; + +/* Dissect Vendor-Specific Tags introduced by the DSLF */ +static void +dissect_pppoe_subtags_dslf(tvbuff_t *tvb, packet_info *pinfo _U_, int offset, proto_tree *tree, + int payload_length) +{ + guint8 poe_tag; + guint8 poe_tag_length; + int tagstart; + + proto_tree *pppoe_tree, *ti, *encaps_tree; + + /* Start Decoding Here. */ +/* if (tree) */ + { + /* Create tags subtree */ + ti = proto_tree_add_item(tree, hf_pppoed_tag_vspec_tags, tvb, offset, payload_length, ENC_NA); + pppoe_tree = proto_item_add_subtree(ti, ett_pppoed_tags); + + tagstart = offset; + + /* Loop until all data seen or End-Of-List tag found */ + while (tagstart <= offset + payload_length-2) + { + poe_tag = tvb_get_guint8(tvb, tagstart); + poe_tag_length = tvb_get_guint8(tvb, tagstart + 1); + + /* Tag value and data length */ + if (global_pppoe_show_tags_and_lengths) + { + proto_tree_add_item(pppoe_tree, hf_pppoed_tag_vspec_tag, tvb, tagstart, 1, ENC_BIG_ENDIAN); + proto_tree_add_item(pppoe_tree, hf_pppoed_tag_length_8, tvb, tagstart+1, 1, ENC_BIG_ENDIAN); + } + + /* Show tag data */ + switch (poe_tag) + { + CASE_VSPEC_DSLF_TAG_STRING(PPPOE_TAG_VSPEC_DSLF_CIRCUIT_ID, <=, 63, + hf_pppoed_tag_vspec_circuit_id) + CASE_VSPEC_DSLF_TAG_STRING(PPPOE_TAG_VSPEC_DSLF_REMOTE_ID, <=, 63, + hf_pppoed_tag_vspec_remote_id) + CASE_VSPEC_DSLF_TAG_UINT(PPPOE_TAG_VSPEC_DSLF_ACT_DATA_RATE_UP, ==, 4, + hf_pppoed_tag_vspec_act_data_rate_up) + CASE_VSPEC_DSLF_TAG_UINT(PPPOE_TAG_VSPEC_DSLF_ACT_DATA_RATE_DOWN, ==, 4, + hf_pppoed_tag_vspec_act_data_rate_down) + CASE_VSPEC_DSLF_TAG_UINT(PPPOE_TAG_VSPEC_DSLF_MIN_DATA_RATE_UP, ==, 4, + hf_pppoed_tag_vspec_min_data_rate_up) + CASE_VSPEC_DSLF_TAG_UINT(PPPOE_TAG_VSPEC_DSLF_MIN_DATA_RATE_DOWN, ==, 4, + hf_pppoed_tag_vspec_min_data_rate_down) + CASE_VSPEC_DSLF_TAG_UINT(PPPOE_TAG_VSPEC_DSLF_ATTAINABLE_DATA_RATE_UP, ==, 4, + hf_pppoed_tag_vspec_attainable_data_rate_up) + CASE_VSPEC_DSLF_TAG_UINT(PPPOE_TAG_VSPEC_DSLF_ATTAINABLE_DATA_RATE_DOWN, ==, 4, + hf_pppoed_tag_vspec_attainable_data_rate_down) + CASE_VSPEC_DSLF_TAG_UINT(PPPOE_TAG_VSPEC_DSLF_MAX_DATA_RATE_UP, ==, 4, + hf_pppoed_tag_vspec_max_data_rate_up) + CASE_VSPEC_DSLF_TAG_UINT(PPPOE_TAG_VSPEC_DSLF_MAX_DATA_RATE_DOWN, ==, 4, + hf_pppoed_tag_vspec_max_data_rate_down) + CASE_VSPEC_DSLF_TAG_UINT(PPPOE_TAG_VSPEC_DSLF_MIN_DATA_RATE_UP_LP, ==, 4, + hf_pppoed_tag_vspec_min_data_rate_up_lp) + CASE_VSPEC_DSLF_TAG_UINT(PPPOE_TAG_VSPEC_DSLF_MIN_DATA_RATE_DOWN_LP, ==, 4, + hf_pppoed_tag_vspec_min_data_rate_down_lp) + CASE_VSPEC_DSLF_TAG_UINT(PPPOE_TAG_VSPEC_DSLF_MAX_INT_DELAY_UP, ==, 4, + hf_pppoed_tag_vspec_max_int_delay_up) + CASE_VSPEC_DSLF_TAG_UINT(PPPOE_TAG_VSPEC_DSLF_ACT_INT_DELAY_UP, ==, 4, + hf_pppoed_tag_vspec_act_int_delay_up) + CASE_VSPEC_DSLF_TAG_UINT(PPPOE_TAG_VSPEC_DSLF_MAX_INT_DELAY_DOWN, ==, 4, + hf_pppoed_tag_vspec_max_int_delay_down) + CASE_VSPEC_DSLF_TAG_UINT(PPPOE_TAG_VSPEC_DSLF_ACT_INT_DELAY_DOWN, ==, 4, + hf_pppoed_tag_vspec_act_int_delay_down) + case PPPOE_TAG_VSPEC_DSLF_ACCESS_LOOP_ENCAPSULATION: + ti = proto_tree_add_item(pppoe_tree, hf_pppoed_tag_vspec_access_loop_encapsulation, tvb, + tagstart+2, 3, ENC_NA); + if (poe_tag_length != 3) { + expert_add_info_format(pinfo, ti, &ei_pppoe_tag_length, "%s: Wrong length: %u (expected 3)", val_to_str_const(poe_tag, vspec_tag_vals, "Unknown"), poe_tag_length); + } + encaps_tree = proto_item_add_subtree(ti, ett_pppoed_tag_vspec_dslf_access_loop_encaps); + proto_tree_add_item(encaps_tree, hf_pppoed_tag_vspec_access_loop_encap_data_link, + tvb, tagstart+2, 1, ENC_BIG_ENDIAN); + proto_tree_add_item(encaps_tree, hf_pppoed_tag_vspec_access_loop_encap_encap_1, + tvb, tagstart+3, 1, ENC_BIG_ENDIAN); + proto_tree_add_item(encaps_tree, hf_pppoed_tag_vspec_access_loop_encap_encap_2, + tvb, tagstart+4, 1, ENC_BIG_ENDIAN); + + break; + default: + if (poe_tag_length > 0 ) + { + /* Presumably unknown tag; + show tag value if we didn't do it above */ + if (!global_pppoe_show_tags_and_lengths) + { + proto_tree_add_item(pppoe_tree, hf_pppoed_tag, tvb, tagstart, 1, ENC_BIG_ENDIAN); + proto_tree_add_item(pppoe_tree, hf_pppoed_tag_length_8, tvb, tagstart+1, 1, ENC_BIG_ENDIAN); + } + proto_tree_add_item(pppoe_tree, hf_pppoed_tag_unknown_data, tvb, + tagstart+2, poe_tag_length, ENC_NA); + } + } + + tagstart += (2 + poe_tag_length); + } + } +} + + +/* Dissect discovery protocol tags */ +static void +dissect_pppoe_tags(tvbuff_t *tvb, packet_info *pinfo, int offset, proto_tree *tree, + int payload_length) +{ + guint16 poe_tag; + guint16 poe_tag_length; + int tagstart; + guint16 poe_rsv = 0; + + proto_tree *pppoe_tree; + proto_item *ti; + proto_item *pppoe_tree_tag_length_item = NULL; + + /* Start Decoding Here. */ +/* if (tree) */ + { + /* Create tags subtree */ + ti = proto_tree_add_item(tree, hf_pppoed_tags, tvb, offset, payload_length-6, ENC_NA); + pppoe_tree = proto_item_add_subtree(ti, ett_pppoed_tags); + + tagstart = offset; + + /* Loop until all data seen or End-Of-List tag found */ + while (tagstart <= payload_length-2) + { + poe_tag = tvb_get_ntohs(tvb, tagstart); + poe_tag_length = tvb_get_ntohs(tvb, tagstart + 2); + + /* Tag value and data length */ + if (global_pppoe_show_tags_and_lengths) + { + proto_tree_add_item(pppoe_tree, hf_pppoed_tag, tvb, tagstart, 2, ENC_BIG_ENDIAN); + pppoe_tree_tag_length_item = + proto_tree_add_item(pppoe_tree, hf_pppoed_tag_length, tvb, tagstart+2, 2, ENC_BIG_ENDIAN); + } + + /* Show tag data */ + switch (poe_tag) + { + case PPPOE_TAG_SVC_NAME: + if (poe_tag_length > 0) + { + proto_tree_add_item(pppoe_tree, hf_pppoed_tag_service_name, tvb, + tagstart+4, poe_tag_length, ENC_ASCII); + } + break; + case PPPOE_TAG_AC_NAME: + { + const guint8* str; + proto_tree_add_item_ret_string(pppoe_tree, hf_pppoed_tag_ac_name, tvb, + tagstart+4, poe_tag_length, ENC_ASCII|ENC_NA, pinfo->pool, &str); + /* Show AC-Name in info column */ + col_append_fstr(pinfo->cinfo, COL_INFO, " AC-Name='%s'", str); + } + break; + case PPPOE_TAG_HOST_UNIQ: + proto_tree_add_item(pppoe_tree, hf_pppoed_tag_host_uniq, tvb, + tagstart+4, poe_tag_length, ENC_NA); + break; + case PPPOE_TAG_AC_COOKIE: + proto_tree_add_item(pppoe_tree, hf_pppoed_tag_ac_cookie, tvb, + tagstart+4, poe_tag_length, ENC_NA); + break; + case PPPOE_TAG_VENDOR: + if (poe_tag_length >= 4) + { + proto_tree_add_item(pppoe_tree, hf_pppoed_tag_vendor_id, tvb, + tagstart+4, 4, ENC_BIG_ENDIAN); + } + if (poe_tag_length > 4) + { + guint32 vendor_id = tvb_get_ntohl(tvb, tagstart+4); + switch (vendor_id) + { + case PPPOE_VENDOR_ID_DSLF: + dissect_pppoe_subtags_dslf(tvb,pinfo,tagstart+4+4,pppoe_tree,poe_tag_length-4); + break; + default: + proto_tree_add_item(pppoe_tree, hf_pppoed_tag_vendor_unspecified, tvb, + tagstart+4+4, poe_tag_length-4, ENC_NA); + + } + } + break; + case PPPOE_TAG_CREDITS: + if (poe_tag_length == 4) + { + proto_tree_add_item(pppoe_tree, hf_pppoed_tag_credits_fcn, tvb, + tagstart+4, 2, ENC_BIG_ENDIAN); + proto_tree_add_item(pppoe_tree, hf_pppoed_tag_credits_bcn, tvb, + tagstart+6, 2, ENC_BIG_ENDIAN); + } else { + proto_tree_add_item(pppoe_tree, hf_pppoed_tag_credits, tvb, + tagstart+4, poe_tag_length, ENC_NA); + } + break; + case PPPOE_TAG_METRICS: + if (poe_tag_length == 10) + { + poe_rsv = tvb_get_ntohs(tvb, tagstart+4); + + proto_tree_add_item(pppoe_tree, hf_pppoed_tag_mdr_units, tvb, + tagstart+4, 2, ENC_BIG_ENDIAN); + proto_tree_add_item(pppoe_tree, hf_pppoed_tag_cdr_units, tvb, + tagstart+4, 2, ENC_BIG_ENDIAN); + proto_tree_add_item(pppoe_tree, hf_pppoed_tag_metrics_r, tvb, + tagstart+4, 2, ENC_BIG_ENDIAN); + proto_tree_add_item(pppoe_tree, hf_pppoed_tag_metrics_rlq, tvb, + tagstart+6, 1, ENC_BIG_ENDIAN); + proto_tree_add_item(pppoe_tree, hf_pppoed_tag_metrics_resource, tvb, + tagstart+7, 1, ENC_BIG_ENDIAN); + proto_tree_add_item(pppoe_tree, hf_pppoed_tag_metrics_latency, tvb, + tagstart+8, 2, ENC_BIG_ENDIAN); + + /* CDR */ + ti = proto_tree_add_item(pppoe_tree, hf_pppoed_tag_metrics_curr_drate, tvb, + tagstart+10, 2, ENC_BIG_ENDIAN); + + switch ((poe_rsv & PPPOE_CDR_MASK) >> 1) + { + case (PPPOE_SCALE_KBPS): + proto_item_append_text(ti, " kbps"); + break; + case (PPPOE_SCALE_MBPS): + proto_item_append_text(ti, " mbps"); + break; + case (PPPOE_SCALE_GBPS): + proto_item_append_text(ti, " gbps"); + break; + case (PPPOE_SCALE_TBPS): + proto_item_append_text(ti, " tbps"); + break; + } + + /* MDR */ + ti = proto_tree_add_item(pppoe_tree, hf_pppoed_tag_metrics_max_drate, tvb, + tagstart+12, 2, ENC_BIG_ENDIAN); + + switch ((poe_rsv & PPPOE_MDR_MASK) >> 3) + { + case (PPPOE_SCALE_KBPS): + proto_item_append_text(ti, " kbps"); + break; + case (PPPOE_SCALE_MBPS): + proto_item_append_text(ti, " mbps"); + break; + case (PPPOE_SCALE_GBPS): + proto_item_append_text(ti, " gbps"); + break; + case (PPPOE_SCALE_TBPS): + proto_item_append_text(ti, " tbps"); + break; + } + + } else { + proto_tree_add_item(pppoe_tree, hf_pppoed_tag_metrics, tvb, + tagstart+4, poe_tag_length, ENC_NA); + } + break; + case PPPOE_TAG_SEQ_NUM: + if (poe_tag_length == 2) { + proto_tree_add_item(pppoe_tree, hf_pppoed_tag_seq_num, tvb, + tagstart+4, poe_tag_length, ENC_BIG_ENDIAN); + } else { + if (global_pppoe_show_tags_and_lengths) { + proto_item_append_text(pppoe_tree_tag_length_item, " [Wrong: should be 2]"); + } + + proto_tree_add_expert_format(pppoe_tree, pinfo, &ei_pppoe_tag_length, tvb, tagstart+4, poe_tag_length, + "Sequence Number tag: Wrong length: %u (expected 2)", poe_tag_length); + } + break; + case PPPOE_TAG_CRED_SCALE: + if (poe_tag_length == 2) { + proto_tree_add_item(pppoe_tree, hf_pppoed_tag_cred_scale, tvb, + tagstart+4, poe_tag_length, ENC_BIG_ENDIAN); + } else { + if (global_pppoe_show_tags_and_lengths) { + proto_item_append_text(pppoe_tree_tag_length_item, " [Wrong: should be 2]"); + } + proto_tree_add_expert_format(pppoe_tree, pinfo, &ei_pppoe_tag_length, tvb, tagstart+4, poe_tag_length, + "Credit Scale Factor tag: Wrong length: %u (expected 2)", poe_tag_length); + } + break; + case PPPOE_TAG_RELAY_ID: + proto_tree_add_item(pppoe_tree, hf_pppoed_tag_relay_session_id, tvb, + tagstart+4, poe_tag_length, ENC_NA); + break; + case PPPOE_TAG_HURL: + proto_tree_add_item(pppoe_tree, hf_pppoed_tag_hurl, tvb, + tagstart+4, poe_tag_length, ENC_NA); + break; + case PPPOE_TAG_MOTM: + proto_tree_add_item(pppoe_tree, hf_pppoed_tag_motm, tvb, + tagstart+4, poe_tag_length, ENC_NA); + break; + case PPPOE_TAG_MAX_PAYLD: + proto_tree_add_item(pppoe_tree, hf_pppoed_tag_max_payload, tvb, + tagstart+4, poe_tag_length, ENC_NA); + break; + case PPPOE_TAG_IP_RT_ADD: + proto_tree_add_item(pppoe_tree, hf_pppoed_tag_ip_route_add, tvb, + tagstart+4, poe_tag_length, ENC_NA); + break; + + /* These error tag values should be interpreted as a utf-8 unterminated + strings. */ + case PPPOE_TAG_SVC_ERR: + proto_tree_add_item(pppoe_tree, hf_pppoed_tag_service_name_error, tvb, + tagstart+4, poe_tag_length, ENC_ASCII); + break; + case PPPOE_TAG_AC_ERR: + proto_tree_add_item(pppoe_tree, hf_pppoed_tag_ac_system_error, tvb, + tagstart+4, poe_tag_length, ENC_ASCII); + break; + case PPPOE_TAG_GENERIC_ERR: + proto_tree_add_item(pppoe_tree, hf_pppoed_tag_generic_error, tvb, + tagstart+4, poe_tag_length, ENC_ASCII); + break; + + /* Get out if see end-of-list tag */ + case PPPOE_TAG_EOL: + return; + + default: + if (poe_tag_length > 0 ) + { + /* Presumably unknown tag; + show tag value if we didn't + do it above */ + if (!global_pppoe_show_tags_and_lengths) + { + proto_tree_add_item(pppoe_tree, hf_pppoed_tag, tvb, tagstart, 2, ENC_BIG_ENDIAN); + proto_tree_add_item(pppoe_tree, hf_pppoed_tag_length, tvb, tagstart+2, 2, ENC_BIG_ENDIAN); + } + proto_tree_add_item(pppoe_tree, hf_pppoed_tag_unknown_data, tvb, + tagstart+2, poe_tag_length, ENC_NA); + } + } + + tagstart += (4 + poe_tag_length); + } + } +} + + +/* Discovery protocol, i.e. PPP session not yet established */ +static int dissect_pppoed(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_) +{ + guint8 pppoe_code; + guint16 reported_payload_length; + + proto_tree *pppoe_tree = NULL; + proto_item *ti; + + col_set_str(pinfo->cinfo, COL_PROTOCOL, "PPPoED"); + col_clear(pinfo->cinfo, COL_INFO); + + /* Start Decoding Here. */ + pppoe_code = tvb_get_guint8(tvb, 1); + + col_append_str(pinfo->cinfo, COL_INFO, val_to_str_const(pppoe_code, code_vals, "Unknown")); + + /* Read length of payload */ + reported_payload_length = tvb_get_ntohs(tvb, 4); + + if (tree) + { + ti = proto_tree_add_item(tree, proto_pppoed, tvb, 0, reported_payload_length+6, ENC_NA); + pppoe_tree = proto_item_add_subtree(ti, ett_pppoed); + + /* Dissect fixed fields */ + proto_tree_add_item(pppoe_tree, hf_pppoe_version, tvb, 0, 1, ENC_BIG_ENDIAN); + proto_tree_add_item(pppoe_tree, hf_pppoe_type, tvb, 0, 1, ENC_BIG_ENDIAN); + proto_tree_add_item(pppoe_tree, hf_pppoe_code, tvb, 1, 1, ENC_BIG_ENDIAN); + proto_tree_add_item(pppoe_tree, hf_pppoe_session_id, tvb, 2, 2, ENC_BIG_ENDIAN); + proto_tree_add_item(pppoe_tree, hf_pppoe_payload_length, tvb, 4, 2, ENC_BIG_ENDIAN); + } + + /* Now dissect any tags */ + if (reported_payload_length > 0) + { + dissect_pppoe_tags(tvb, pinfo, 6, pppoe_tree, 6+reported_payload_length); + } + + return tvb_captured_length(tvb); +} + +void proto_register_pppoed(void) +{ + static hf_register_info hf[] = + { + /* Discovery tag fields */ + { &hf_pppoed_tags, + { "PPPoE Tags", "pppoed.tags", FT_NONE, BASE_NONE, + NULL, 0x0, NULL, HFILL + } + }, + { &hf_pppoed_tag, + { "Tag", "pppoed.tag", FT_UINT16, BASE_HEX, + VALS(tag_vals), 0x0, NULL, HFILL + } + }, + { &hf_pppoed_tag_length, + { "Tag Length", "pppoed.tag_length", FT_UINT16, BASE_DEC, + NULL, 0x0, NULL, HFILL + } + }, + { &hf_pppoed_tag_length_8, + { "Tag Length", "pppoed.tag_length_8", FT_UINT8, BASE_DEC, + NULL, 0x0, NULL, HFILL + } + }, + { &hf_pppoed_tag_unknown_data, + { "Unknown Data", "pppoed.tag.unknown_data", FT_BYTES, BASE_NONE, + NULL, 0x0, NULL, HFILL + } + }, + { &hf_pppoed_tag_service_name, + { "Service-Name", "pppoed.tags.service_name", FT_STRING, BASE_NONE, + NULL, 0x0, NULL, HFILL + } + }, + { &hf_pppoed_tag_ac_name, + { "AC-Name", "pppoed.tags.ac_name", FT_STRING, BASE_NONE, + NULL, 0x0, NULL, HFILL + } + }, + { &hf_pppoed_tag_host_uniq, + { "Host-Uniq", "pppoed.tags.host_uniq", FT_BYTES, BASE_NONE, + NULL, 0x0, NULL, HFILL + } + }, + { &hf_pppoed_tag_ac_cookie, + { "AC-Cookie", "pppoed.tags.ac_cookie", FT_BYTES, BASE_NONE, + NULL, 0x0, NULL, HFILL + } + }, + { &hf_pppoed_tag_vendor_id, + { "Vendor id", "pppoed.tags.vendor_id", FT_UINT32, BASE_DEC, + NULL, 0x0, NULL, HFILL + } + }, + { &hf_pppoed_tag_vendor_unspecified, + { "Vendor unspecified", "pppoed.tags.vendor_unspecified", FT_BYTES, BASE_NONE, + NULL, 0x0, NULL, HFILL + } + }, + { &hf_pppoed_tag_vspec_tags, + { "Vendor Specific PPPoE Tags", "pppoed.tags.vendorspecific.tags", FT_NONE, BASE_NONE, + NULL, 0x0, NULL, HFILL + } + }, + { &hf_pppoed_tag_vspec_tag, + { "Tag", "pppoed.tags.vendorspecific.tag", FT_UINT8, BASE_HEX, + VALS(vspec_tag_vals), 0x0, NULL, HFILL + } + }, + { &hf_pppoed_tag_vspec_circuit_id, + { "Circuit ID", "pppoed.tags.circuit_id", FT_STRING, BASE_NONE, + NULL, 0x0, NULL, HFILL + } + }, + { &hf_pppoed_tag_vspec_remote_id, + { "Remote ID", "pppoed.tags.remote_id", FT_STRING, BASE_NONE, + NULL, 0x0, NULL, HFILL + } + }, + { &hf_pppoed_tag_vspec_act_data_rate_up, + { "Actual Data Rate Upstream", "pppoed.tags.act_data_rate_up", FT_UINT32, BASE_DEC, + NULL, 0x0, NULL, HFILL + } + }, + { &hf_pppoed_tag_vspec_act_data_rate_down, + { "Actual Data Rate Downstream", "pppoed.tags.act_data_rate_down", FT_UINT32, BASE_DEC, + NULL, 0x0, NULL, HFILL + } + }, + { &hf_pppoed_tag_vspec_min_data_rate_up, + { "Minimum Data Rate Upstream", "pppoed.tags.min_data_rate_up", FT_UINT32, BASE_DEC, + NULL, 0x0, NULL, HFILL + } + }, + { &hf_pppoed_tag_vspec_min_data_rate_down, + { "Minimum Data Rate Downstream", "pppoed.tags.min_data_rate_down", FT_UINT32, BASE_DEC, + NULL, 0x0, NULL, HFILL + } + }, + { &hf_pppoed_tag_vspec_attainable_data_rate_up, + { "Attainable DataRate Upstream", "pppoed.tags.attainable_data_rate_up", FT_UINT32, BASE_DEC, + NULL, 0x0, NULL, HFILL + } + }, + { &hf_pppoed_tag_vspec_attainable_data_rate_down, + { "Attainable DataRate Downstream", "pppoed.tags.attainable_data_rate_down", FT_UINT32, BASE_DEC, + NULL, 0x0, NULL, HFILL + } + }, + { &hf_pppoed_tag_vspec_max_data_rate_up, + { "Maximum Data Rate Upstream", "pppoed.tags.max_data_rate_up", FT_UINT32, BASE_DEC, + NULL, 0x0, NULL, HFILL + } + }, + { &hf_pppoed_tag_vspec_max_data_rate_down, + { "Maximum Data Rate Downstream", "pppoed.tags.max_data_rate_down", FT_UINT32, BASE_DEC, + NULL, 0x0, NULL, HFILL + } + }, + { &hf_pppoed_tag_vspec_min_data_rate_up_lp, + { "Min DataRate Upstream in low power state", "pppoed.tags.min_data_rate_up_lp", FT_UINT32, BASE_DEC, + NULL, 0x0, NULL, HFILL + } + }, + { &hf_pppoed_tag_vspec_min_data_rate_down_lp, + { "Minimum Data Rate Downstream in low power state", "pppoed.tags.min_data_rate_down_lp", FT_UINT32, BASE_DEC, + NULL, 0x0, NULL, HFILL + } + }, + { &hf_pppoed_tag_vspec_max_int_delay_up, + { "Max Interleaving Delay Upstream", "pppoed.tags.max_int_delay_up", FT_UINT32, BASE_DEC, + NULL, 0x0, NULL, HFILL + } + }, + { &hf_pppoed_tag_vspec_act_int_delay_up, + { "Actual Interleaving Delay Upstream", "pppoed.tags.act_int_delay_up", FT_UINT32, BASE_DEC, + NULL, 0x0, NULL, HFILL + } + }, + { &hf_pppoed_tag_vspec_max_int_delay_down, + { "Maximum Interleaving Delay Downstream", "pppoed.tags.max_int_delay_down", FT_UINT32, BASE_DEC, + NULL, 0x0, NULL, HFILL + } + }, + { &hf_pppoed_tag_vspec_act_int_delay_down, + { "Actual Interleaving Delay Downstream", "pppoed.tags.act_int_delay_down", FT_UINT32, BASE_DEC, + NULL, 0x0, NULL, HFILL + } + }, + { &hf_pppoed_tag_vspec_access_loop_encapsulation, + { "Access-Loop-Encapsulation", "pppoed.tags.access_loop_encap", FT_NONE, BASE_NONE, + NULL, 0x0, NULL, HFILL + } + }, + { &hf_pppoed_tag_vspec_access_loop_encap_data_link, + { "Data link", "pppoed.tags.access_loop_encap.data_link", FT_UINT8, BASE_HEX, + VALS(vspec_tag_dslf_access_loop_encap_data_link_vals), 0x0, NULL, HFILL + } + }, + { &hf_pppoed_tag_vspec_access_loop_encap_encap_1, + { "Encaps 1", "pppoed.tags.access_loop_encap.encap_1", FT_UINT8, BASE_HEX, + VALS(vspec_tag_dslf_access_loop_encap_encap_1_vals), 0x0, NULL, HFILL + } + }, + { &hf_pppoed_tag_vspec_access_loop_encap_encap_2, + { "Encaps 2", "pppoed.tags.access_loop_encap.encap_2", FT_UINT8, BASE_HEX, + VALS(vspec_tag_dslf_access_loop_encap_encap_2_vals), 0x0, NULL, HFILL + } + }, + { &hf_pppoed_tag_credits, + { "Credits", "pppoed.tags.credits", FT_BYTES, BASE_NONE, + NULL, 0x0, NULL, HFILL + } + }, + { &hf_pppoed_tag_credits_fcn, + { "FCN", "pppoed.tags.credits.fcn", FT_UINT16, BASE_DEC, + NULL, 0x0, NULL, HFILL + } + }, + { &hf_pppoed_tag_credits_bcn, + { "BCN", "pppoed.tags.credits.bcn", FT_UINT16, BASE_DEC, + NULL, 0x0, NULL, HFILL + } + }, + { &hf_pppoed_tag_metrics, + { "Metrics", "pppoed.tags.metrics", FT_BYTES, BASE_NONE, + NULL, 0x0, NULL, HFILL + } + }, + { &hf_pppoed_tag_metrics_r, + { "Receive Only", "pppoed.tags.metrics.r", FT_BOOLEAN, 16, + NULL, PPPOE_RCV_ONLY_MASK, NULL, HFILL + } + }, + { &hf_pppoed_tag_mdr_units, + { "MDR Units", "pppoed.tags.metrics.mdr_units", FT_UINT16, BASE_HEX, + VALS(datarate_scale_vals), PPPOE_MDR_MASK, NULL, HFILL + } + }, + { &hf_pppoed_tag_cdr_units, + { "CDR Units", "pppoed.tags.metrics.cdr_units", FT_UINT16, BASE_HEX, + VALS(datarate_scale_vals), PPPOE_CDR_MASK, NULL, HFILL + } + }, + { &hf_pppoed_tag_metrics_rlq, + { "Relative Link Quality", "pppoed.tags.metrics.rlq", FT_UINT8, BASE_DEC, + NULL, 0x0, NULL, HFILL + } + }, + { &hf_pppoed_tag_metrics_resource, + { "Resource", "pppoed.tags.metrics.resource", FT_UINT8, BASE_DEC, + NULL, 0x0, NULL, HFILL + } + }, + { &hf_pppoed_tag_metrics_latency, + { "Latency", "pppoed.tags.metrics.latency", FT_UINT16, BASE_DEC, + NULL, 0x0, NULL, HFILL + } + }, + { &hf_pppoed_tag_metrics_curr_drate, + { "Curr. datarate", "pppoed.tags.metrics.curr_drate", FT_UINT16, BASE_DEC, + NULL, 0x0, NULL, HFILL + } + }, + { &hf_pppoed_tag_metrics_max_drate, + { "Max. datarate", "pppoed.tags.metrics.max_drate", FT_UINT16, BASE_DEC, + NULL, 0x0, NULL, HFILL + } + }, + { &hf_pppoed_tag_seq_num, + { "Sequence Number", "pppoed.tags.seq_num", FT_UINT16, BASE_HEX, + NULL, 0x0, NULL, HFILL + } + }, + { &hf_pppoed_tag_cred_scale, + { "Credit Scale Factor", "pppoed.tags.credit_scale", FT_UINT16, BASE_DEC, + NULL, 0x0, NULL, HFILL + } + }, + { &hf_pppoed_tag_relay_session_id, + { "Relay-Session-Id", "pppoed.tags.relay_session_id", FT_BYTES, BASE_NONE, + NULL, 0x0, NULL, HFILL + } + }, + { &hf_pppoed_tag_hurl, + { "HURL", "pppoed.tags.hurl", FT_BYTES, BASE_NONE, + NULL, 0x0, NULL, HFILL + } + }, + { &hf_pppoed_tag_motm, + { "MOTM", "pppoed.tags.motm", FT_BYTES, BASE_NONE, + NULL, 0x0, NULL, HFILL + } + }, + { &hf_pppoed_tag_max_payload, + { "PPP-Max-Payload", "pppoed.tags.max_payload", FT_BYTES, BASE_NONE, + NULL, 0x0, NULL, HFILL + } + }, + { &hf_pppoed_tag_ip_route_add, + { "IP Route Add", "pppoed.tags.ip_route_add", FT_BYTES, BASE_NONE, + NULL, 0x0, NULL, HFILL + } + }, + { &hf_pppoed_tag_service_name_error, + { "Service-Name-Error", "pppoed.tags.service_name_error", FT_STRING, BASE_NONE, + NULL, 0x0, NULL, HFILL + } + }, + { &hf_pppoed_tag_ac_system_error, + { "AC-System-Error", "pppoed.tags.ac_system_error", FT_STRING, BASE_NONE, + NULL, 0x0, NULL, HFILL + } + }, + { &hf_pppoed_tag_generic_error, + { "Generic-Error", "pppoed.tags.generic_error", FT_STRING, BASE_NONE, + NULL, 0x0, NULL, HFILL + } + } + }; + + static gint *ett[] = { + &ett_pppoed, + &ett_pppoed_tags, + &ett_pppoed_tag_vspec_dslf_access_loop_encaps + }; + + module_t *pppoed_module; + + /* Register protocol and fields */ + proto_pppoed = proto_register_protocol("PPP-over-Ethernet Discovery", + "PPPoED", "pppoed"); + proto_register_subtree_array(ett, array_length(ett)); + proto_register_field_array(proto_pppoed, hf, array_length(hf)); + + /* Register dissector handle */ + pppoed_handle = register_dissector("pppoed", dissect_pppoed, proto_pppoed); + + /* Preference setting */ + pppoed_module = prefs_register_protocol(proto_pppoed, NULL); + prefs_register_bool_preference(pppoed_module, "show_tags_and_lengths", + "Show tag values and lengths", + "Show values of tags and lengths of data fields", + &global_pppoe_show_tags_and_lengths); +} + +void proto_reg_handoff_pppoed(void) +{ + dissector_add_uint("ethertype", ETHERTYPE_PPPOED, pppoed_handle); +} + + +/* Session protocol, i.e. PPP session established */ +static int dissect_pppoes(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_) +{ + guint8 pppoe_code; + guint16 reported_payload_length; + guint16 poe_tag_length; + gint actual_payload_length; + gint length, reported_length; + gint credit_offset = 0, tagstart = 0; + guint16 cp_code; + + proto_tree *pppoe_tree; + proto_item *ti = NULL; + tvbuff_t *next_tvb; + + col_set_str(pinfo->cinfo, COL_PROTOCOL, "PPPoES"); + col_clear(pinfo->cinfo, COL_INFO); + + /* Start Decoding Here. */ + pppoe_code = tvb_get_guint8(tvb, 1); + + col_set_str(pinfo->cinfo, COL_INFO, + val_to_str_const(pppoe_code, code_vals, "Unknown")); + + reported_payload_length = tvb_get_ntohs(tvb, 4); + actual_payload_length = tvb_reported_length_remaining(tvb, 6); + + if (tree) + { + ti = proto_tree_add_item(tree, proto_pppoes, tvb, 0, 6, ENC_NA); + pppoe_tree = proto_item_add_subtree(ti, ett_pppoe); + + proto_tree_add_item(pppoe_tree, hf_pppoe_version, tvb, 0, 1, ENC_BIG_ENDIAN); + proto_tree_add_item(pppoe_tree, hf_pppoe_type, tvb, 0, 1, ENC_BIG_ENDIAN); + proto_tree_add_item(pppoe_tree, hf_pppoe_code, tvb, 1, 1, ENC_BIG_ENDIAN); + proto_tree_add_item(pppoe_tree, hf_pppoe_session_id, tvb, 2, 2, ENC_BIG_ENDIAN); + ti = proto_tree_add_item(pppoe_tree, hf_pppoe_payload_length, tvb, 4, 2, ENC_BIG_ENDIAN); + + + if (PPPOE_TAG_CREDITS == tvb_get_ntohs(tvb, 6)) + { + tagstart = 6; + poe_tag_length = tvb_get_ntohs(tvb, tagstart + 2); + + /* Create tags subtree */ + ti = proto_tree_add_item(pppoe_tree, hf_pppoes_tags, tvb, tagstart, 8, ENC_NA); + pppoe_tree = proto_item_add_subtree(ti, ett_pppoes_tags); + + /* Show tag data */ + if (poe_tag_length == 4) + { + proto_tree_add_item(pppoe_tree, hf_pppoes_tag_credits_fcn, tvb, + tagstart+4, 2, ENC_BIG_ENDIAN); + proto_tree_add_item(pppoe_tree, hf_pppoes_tag_credits_bcn, tvb, + tagstart+6, 2, ENC_BIG_ENDIAN); + } else { + proto_tree_add_item(pppoe_tree, hf_pppoed_tag_credits, tvb, + tagstart+4, poe_tag_length, ENC_NA); + } + + credit_offset = 8; + } + } + + /* + * The only reason why the payload length from the header + * should differ from the remaining data in the packet + * would be if the total packet length, including Ethernet + * CRC, were < 64 bytes, so that padding was required. + * + * That means that you have 14 bytes of Ethernet header, + * 4 bytes of FCS, and fewer than 46 bytes of PPPoE packet. + * + * If that's not the case, we report a difference between + * the payload length in the packet, and the amount of + * data following the PPPoE header, as an error. + */ + if (tvb_reported_length(tvb) > 46) { + /* + * Be forgiving about a possible trailing FCS. + * + * XXX - this dissector currently doesn't know + * whether any extra data past the end of the PPP + * payload is an FCS or not. + * + * If we know that we have an FCS, or that we don't + * have an FCS, we should have been handed a tvbuff + * without the FCS, and we should just do the strict + * length check. + * + * If we don't know whether we have an FCS, then: + * + * if this isn't over Ethernet - the "E" in "PPPoE" + * nonwithstanding, it can also run on top of 802.11, + * for example - there's no trailer, so any data + * past the payload length is either an FCS or + * bogus; + * + * if this is over Ethernet, there shouldn't be + * a trailer, as the packet is long enough not to + * require a trailer, as per the above; + * + * so perhaps we should assume that if we have exactly + * 4 bytes of extra information, it's an FCS, otherwise + * it's not. + * + * Perhaps we need to have a routine to call to + * do all the length checking, etc., and call it + * from here and from other dissectors where the + * protocol has a length field, or have a way to + * tell the dissector that called us which field + * has the length field and have *that* dissector + * do the length checking and add the expert info + * to the length field, *after* it does all the + * FCS heuristics. + */ + + /* retrieve the control protocol code if it's there */ + cp_code = tvb_get_ntohs(tvb, 6); + /* + * The session payload length expressly does not include pad bytes + * when LCP or IPCP or IPv6CP are present, so avoid the spurious error message + */ + if ((cp_code != PPP_LCP) && (cp_code != PPP_IPCP) && (cp_code != PPP_IPV6CP) && + (reported_payload_length != actual_payload_length) && + ((reported_payload_length + 4) != actual_payload_length)) { + proto_item_append_text(ti, " [incorrect, should be %u]", + actual_payload_length); + expert_add_info_format(pinfo, ti, &ei_pppoe_payload_length, "Possible bad payload length %u != %u", reported_payload_length, actual_payload_length); + } + } + + /* + * Construct a tvbuff containing the PPP packet. + */ + length = tvb_captured_length_remaining(tvb, 6); + reported_length = tvb_reported_length_remaining(tvb, 6); + DISSECTOR_ASSERT(length >= 0); + DISSECTOR_ASSERT(reported_length >= 0); + if (length > reported_length) + length = reported_length; + if ((guint)length > reported_payload_length) + length = reported_payload_length; + if ((guint)reported_length > reported_payload_length) + reported_length = reported_payload_length; + next_tvb = tvb_new_subset_length_caplen(tvb,(6 + credit_offset), + (length - credit_offset), + (reported_length - credit_offset)); + call_dissector(ppp_handle,next_tvb,pinfo,tree); + return tvb_captured_length(tvb); +} + +void proto_register_pppoes(void) +{ + + static hf_register_info hf[] = + { + { &hf_pppoes_tags, + { "PPPoE Tags", "pppoes.tags", FT_NONE, BASE_NONE, + NULL, 0x0, NULL, HFILL + } + }, +#if 0 + { &hf_pppoes_tag, + { "Tag", "pppoes.tag", FT_UINT16, BASE_HEX, + VALS(tag_vals), 0x0, NULL, HFILL + } + }, +#endif +#if 0 + { &hf_pppoes_tag_credits, + { "Credits", "pppoes.tags.credits", FT_BYTES, BASE_NONE, + NULL, 0x0, NULL, HFILL + } + }, +#endif + { &hf_pppoes_tag_credits_fcn, + { "FCN", "pppoes.tags.credits.fcn", FT_UINT16, BASE_DEC, + NULL, 0x0, NULL, HFILL + } + }, + { &hf_pppoes_tag_credits_bcn, + { "BCN", "pppoes.tags.credits.bcn", FT_UINT16, BASE_DEC, + NULL, 0x0, NULL, HFILL + } + } + }; + + static gint *ett[] = { + &ett_pppoes, + &ett_pppoes_tags + }; + + /* Register protocol */ + proto_pppoes = proto_register_protocol("PPP-over-Ethernet Session", "PPPoES", "pppoes"); + + proto_register_subtree_array(ett, array_length(ett)); + proto_register_field_array(proto_pppoes, hf, array_length(hf)); + + pppoes_handle = register_dissector("pppoes", dissect_pppoes, proto_pppoes); +} + +void proto_register_pppoe(void) +{ + static hf_register_info hf[] = + { + /* These fields common to discovery and session protocols */ + { &hf_pppoe_version, + { "Version", "pppoe.version", FT_UINT8, BASE_DEC, + NULL, 0xf0, NULL, HFILL + } + }, + { &hf_pppoe_type, + { "Type", "pppoe.type", FT_UINT8, BASE_DEC, + NULL, 0x0f, NULL, HFILL + } + }, + { &hf_pppoe_code, + { "Code", "pppoe.code", FT_UINT8, BASE_HEX, + VALS(code_vals), 0x0, NULL, HFILL + } + }, + { &hf_pppoe_session_id, + { "Session ID", "pppoe.session_id", FT_UINT16, BASE_HEX, + NULL, 0x0, NULL, HFILL + } + }, + { &hf_pppoe_payload_length, + { "Payload Length", "pppoe.payload_length", FT_UINT16, BASE_DEC, + NULL, 0x0, NULL, HFILL + } + } + }; + + static gint *ett[] = { + &ett_pppoe + }; + + static ei_register_info ei[] = { + { &ei_pppoe_tag_length, { "pppoed.tag_length.invalid", PI_MALFORMED, PI_WARN, "Wrong length", EXPFILL }}, + { &ei_pppoe_payload_length, { "pppoe.payload_length.bad", PI_MALFORMED, PI_WARN, "Possible bad payload length", EXPFILL }}, + }; + + expert_module_t* expert_pppoe; + + /* Register protocol */ + proto_pppoe = proto_register_protocol("PPP-over-Ethernet", "PPPoE", "pppoe"); + + proto_register_subtree_array(ett, array_length(ett)); + proto_register_field_array(proto_pppoe, hf, array_length(hf)); + expert_pppoe = expert_register_protocol(proto_pppoe); + expert_register_field_array(expert_pppoe, ei, array_length(ei)); + +} + +void proto_reg_handoff_pppoes(void) +{ + dissector_add_uint("ethertype", ETHERTYPE_PPPOES, pppoes_handle); + dissector_add_uint("wtap_encap", WTAP_ENCAP_PPP_ETHER, pppoes_handle); + + /* Get a handle for the PPP dissector */ + ppp_handle = find_dissector_add_dependency("ppp", proto_pppoes); +} + +/* + * 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: + */ |