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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-10 20:34:10 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-10 20:34:10 +0000 |
commit | e4ba6dbc3f1e76890b22773807ea37fe8fa2b1bc (patch) | |
tree | 68cb5ef9081156392f1dd62a00c6ccc1451b93df /epan/dissectors/packet-cisco-metadata.c | |
parent | Initial commit. (diff) | |
download | wireshark-e4ba6dbc3f1e76890b22773807ea37fe8fa2b1bc.tar.xz wireshark-e4ba6dbc3f1e76890b22773807ea37fe8fa2b1bc.zip |
Adding upstream version 4.2.2.upstream/4.2.2
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'epan/dissectors/packet-cisco-metadata.c')
-rw-r--r-- | epan/dissectors/packet-cisco-metadata.c | 193 |
1 files changed, 193 insertions, 0 deletions
diff --git a/epan/dissectors/packet-cisco-metadata.c b/epan/dissectors/packet-cisco-metadata.c new file mode 100644 index 00000000..e9b96e8d --- /dev/null +++ b/epan/dissectors/packet-cisco-metadata.c @@ -0,0 +1,193 @@ +/* packet-cisco-metadata.c + * Routines for dissection of Cisco's MetaData protocol. + * draft-smith-kandula-sxp + * Copyright 2013 by Vaibhav Katkade (vkatkade[AT]cisco.com) + * + * 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> +#if 0 +#include "packet-ieee8023.h" +#endif + +void proto_register_cmd(void); +void proto_reg_handoff_cmd(void); + +static dissector_handle_t cmd_eth_handle; +static dissector_handle_t cmd_gre_handle; + +static dissector_handle_t ethertype_handle; + +static dissector_table_t gre_dissector_table; + +static int proto_cmd = -1; + +static int hf_cmd_version = -1; +static int hf_cmd_length = -1; +static int hf_cmd_options = -1; +static int hf_cmd_sgt = -1; + +static int hf_eth_type = -1; +static int hf_cmd_trailer = -1; + +static gint ett_cmd = -1; + +static int +dissect_cmd_eth(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_) +{ + guint16 encap_proto; + ethertype_data_t ethertype_data; + + proto_tree *cmd_tree = NULL; + gint offset = 0; + + col_set_str(pinfo->cinfo, COL_PROTOCOL, "CMD"); + col_clear(pinfo->cinfo, COL_INFO); + + if (tree) { + proto_item *ti = proto_tree_add_item(tree, proto_cmd, tvb, 0, 8, ENC_NA); + + cmd_tree = proto_item_add_subtree(ti, ett_cmd); + proto_tree_add_item(cmd_tree, hf_cmd_version, tvb, offset, 1, ENC_BIG_ENDIAN); + offset += 1; + proto_tree_add_item(cmd_tree, hf_cmd_length, tvb, offset, 1, ENC_BIG_ENDIAN); + offset += 1; + proto_tree_add_item(cmd_tree, hf_cmd_options, tvb, offset, 2, ENC_BIG_ENDIAN); + offset += 2; + proto_tree_add_item(cmd_tree, hf_cmd_sgt, tvb, offset, 2, ENC_BIG_ENDIAN); + /*offset += 2;*/ + } + + encap_proto = tvb_get_ntohs(tvb, 6); + +/* This Logic to identify and decode IEEE 802.3 frames is not working correctly. Carry over code from packet-vlan.c + * Commenting it out for now will display as Unknown for L2 control frames instead of showing a wrong decode. + */ +#if 0 + if (encap_proto <= IEEE_802_3_MAX_LEN) { + gboolean is_802_2 = TRUE; + + /* Don't throw an exception for this check (even a BoundsError) */ + if (tvb_captured_length_remaining(tvb, 4) >= 2) { + if (tvb_get_ntohs(tvb, 4) == 0xffff) + is_802_2 = FALSE; + } + + dissect_802_3(encap_proto, is_802_2, tvb, 4, pinfo, tree, cmd_tree, hf_eth_type, hf_cmd_trailer, 0); + } else { +#endif + + proto_tree_add_uint(cmd_tree, hf_eth_type, tvb, 6, 2, encap_proto); + + ethertype_data.etype = encap_proto; + ethertype_data.payload_offset = 8; + ethertype_data.fh_tree = cmd_tree; + ethertype_data.trailer_id = hf_cmd_trailer; + ethertype_data.fcs_len = 0; + + call_dissector_with_data(ethertype_handle, tvb, pinfo, tree, ðertype_data); + return tvb_captured_length(tvb); +} + +static int +dissect_cmd_gre(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_) +{ + proto_item *ti = NULL; + proto_tree *cmd_tree = NULL; + guint16 encap_proto; + tvbuff_t *next_tvb; + gint offset = 0; + + col_set_str(pinfo->cinfo, COL_PROTOCOL, "CMD"); + col_clear(pinfo->cinfo, COL_INFO); + + if (tree) { + ti = proto_tree_add_item(tree, proto_cmd, tvb, 0, 6, ENC_NA); + cmd_tree = proto_item_add_subtree(ti, ett_cmd); + } + encap_proto = tvb_get_ntohs(tvb, 0); + proto_tree_add_item(cmd_tree, hf_eth_type, tvb, offset, 2, ENC_BIG_ENDIAN); + offset += 2; + + proto_tree_add_item(cmd_tree, hf_cmd_version, tvb, offset, 1, ENC_BIG_ENDIAN); + offset += 1; + proto_tree_add_item(cmd_tree, hf_cmd_length, tvb, offset, 1, ENC_BIG_ENDIAN); + offset += 1; + proto_tree_add_item(cmd_tree, hf_cmd_options, tvb, offset, 2, ENC_BIG_ENDIAN); + offset += 2; + proto_tree_add_item(cmd_tree, hf_cmd_sgt, tvb, offset, 2, ENC_BIG_ENDIAN); + offset += 2; + + next_tvb = tvb_new_subset_remaining(tvb, offset); + if (!dissector_try_uint(gre_dissector_table, encap_proto, next_tvb, pinfo, tree)) + call_data_dissector(next_tvb, pinfo, tree); + return tvb_captured_length(tvb); +} + +void +proto_register_cmd(void) +{ + static hf_register_info hf[] = { + { &hf_cmd_version, + { "Version", "cmd.version", FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL } + }, + { &hf_cmd_length, + { "Length", "cmd.length", FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL } + }, + { &hf_cmd_options, + { "Options", "cmd.options", FT_UINT16, BASE_HEX, NULL, 0x0, NULL, HFILL } + }, + { &hf_cmd_sgt, + { "SGT", "cmd.sgt", FT_UINT16, BASE_DEC, NULL, 0x0, NULL, HFILL } + }, + { &hf_eth_type, + { "Type", "cmd.type", FT_UINT16, BASE_HEX, VALS(etype_vals), 0x0, NULL, HFILL } + }, + { &hf_cmd_trailer, + { "Trailer", "cmd.trailer", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL } + }, + }; + + static gint *ett[] = { + &ett_cmd + }; + + proto_cmd = proto_register_protocol("Cisco MetaData", "Cisco MetaData", "cmd"); + proto_register_field_array(proto_cmd, hf, array_length(hf)); + proto_register_subtree_array(ett, array_length(ett)); + + cmd_eth_handle = register_dissector("cmd.eth", dissect_cmd_eth, proto_cmd); + cmd_gre_handle = register_dissector("cmd.gre", dissect_cmd_gre, proto_cmd); +} + +void +proto_reg_handoff_cmd(void) +{ + ethertype_handle = find_dissector_add_dependency("ethertype", proto_cmd); + + gre_dissector_table = find_dissector_table("gre.proto"); + + dissector_add_uint("ethertype", ETHERTYPE_CMD, cmd_eth_handle); + dissector_add_uint("gre.proto", ETHERTYPE_CMD, cmd_gre_handle); +} + +/* + * Editor modelines - https://www.wireshark.org/tools/modelines.html + * + * Local variables: + * c-basic-offset: 4 + * tab-width: 8 + * indent-tabs-mode: nil + * End: + * + * vi: set shiftwidth=4 tabstop=8 expandtab: + * :indentSize=4:tabSize=8:noTabs=true: + */ |