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Diffstat (limited to 'epan/dissectors/packet-ripng.c')
| -rw-r--r-- | epan/dissectors/packet-ripng.c | 178 |
1 files changed, 178 insertions, 0 deletions
diff --git a/epan/dissectors/packet-ripng.c b/epan/dissectors/packet-ripng.c new file mode 100644 index 00000000..8df74457 --- /dev/null +++ b/epan/dissectors/packet-ripng.c @@ -0,0 +1,178 @@ +/* packet-ripng.c + * Routines for RIPng disassembly + * (c) Copyright Jun-ichiro itojun Hagino <itojun@itojun.org> + * derived from packet-rip.c + * + * Wireshark - Network traffic analyzer + * By Gerald Combs <gerald@wireshark.org> + * Copyright 1998 Gerald Combs + * + * Enhance RIPng by Alexis La Goutte + * + * SPDX-License-Identifier: GPL-2.0-or-later + * + * References: + * RFC2080: RIPng for IPv6 + */ + +#include "config.h" + +#include <epan/packet.h> +#include <epan/to_str.h> + +void proto_register_ripng(void); +void proto_reg_handoff_ripng(void); + +static dissector_handle_t ripng_handle; + +static int proto_ripng = -1; +static int hf_ripng_cmd = -1; +static int hf_ripng_version = -1; +static int hf_ripng_reserved = -1; + +static int hf_ripng_rte = -1; +static int hf_ripng_rte_ipv6_prefix = -1; +static int hf_ripng_rte_route_tag = -1; +static int hf_ripng_rte_prefix_length = -1; +static int hf_ripng_rte_metric = -1; + +static gint ett_ripng = -1; +static gint ett_ripng_rte = -1; + +#define UDP_PORT_RIPNG 521 + +#define RIP6_REQUEST 1 +#define RIP6_RESPONSE 2 + +static const value_string cmdvals[] = { + { RIP6_REQUEST, "Request" }, + { RIP6_RESPONSE, "Response" }, + { 0, NULL }, +}; + +static int +dissect_ripng(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_) { + int offset = 0; + proto_tree *ripng_tree = NULL, *rte_tree = NULL; + proto_item *ti, *rte_ti; + + col_set_str(pinfo->cinfo, COL_PROTOCOL, "RIPng"); + col_add_fstr(pinfo->cinfo, COL_INFO," Command %s, Version %u", + val_to_str(tvb_get_guint8(tvb, offset), cmdvals, "Unknown (%u)"), + tvb_get_guint8(tvb, offset +1)); + + if (tree) { + ti = proto_tree_add_item(tree, proto_ripng, tvb, offset, -1, ENC_NA); + ripng_tree = proto_item_add_subtree(ti, ett_ripng); + + /* Command */ + proto_tree_add_item(ripng_tree, hf_ripng_cmd, tvb, offset, 1, ENC_BIG_ENDIAN); + offset += 1; + + /* Version */ + proto_tree_add_item(ripng_tree, hf_ripng_version, tvb, offset, 1, ENC_BIG_ENDIAN); + offset += 1; + + /* Reserved */ + proto_tree_add_item(ripng_tree, hf_ripng_reserved, tvb, offset, 2, ENC_NA); + offset += 2; + + /* Route Table Entry */ + while (tvb_reported_length_remaining(tvb, offset) > 0) { + + rte_ti = proto_tree_add_item(ripng_tree, hf_ripng_rte, tvb, offset, 16 + 2 + 1 + 1, ENC_NA); + rte_tree = proto_item_add_subtree(rte_ti, ett_ripng_rte); + + /* IPv6 Prefix */ + proto_tree_add_item(rte_tree, hf_ripng_rte_ipv6_prefix, tvb, offset, 16, ENC_NA); + proto_item_append_text(rte_ti, ": IPv6 Prefix: %s", tvb_ip6_to_str(pinfo->pool, tvb, offset)); + offset += 16; + + /* Route Tag */ + proto_tree_add_item(rte_tree, hf_ripng_rte_route_tag, tvb, offset, 2, ENC_BIG_ENDIAN); + offset += 2; + + /* Prefix Length */ + proto_tree_add_item(rte_tree, hf_ripng_rte_prefix_length, tvb, offset, 1, ENC_BIG_ENDIAN); + proto_item_append_text(rte_ti, "/%u", tvb_get_guint8(tvb, offset)); + offset += 1; + + /* Metric */ + proto_tree_add_item(rte_tree, hf_ripng_rte_metric, tvb, offset, 1, ENC_BIG_ENDIAN); + proto_item_append_text(rte_ti, " Metric: %u", tvb_get_guint8(tvb, offset)); + offset += 1; + } + } + return tvb_captured_length(tvb); +} + +void +proto_register_ripng(void) +{ + static hf_register_info hf[] = { + { &hf_ripng_cmd, + { "Command", "ripng.cmd", + FT_UINT8, BASE_DEC, VALS(cmdvals), 0x0, + "Used to specify the purpose of this message", HFILL }}, + { &hf_ripng_version, + { "Version", "ripng.version", + FT_UINT8, BASE_DEC, NULL, 0x0, + "Version of RIPng", HFILL }}, + { &hf_ripng_reserved, + { "Reserved", "ripng.reserved", + FT_BYTES, BASE_NONE, NULL, 0x0, + "Must be Zero", HFILL }}, + { &hf_ripng_rte, + { "Route Table Entry", "ripng.rte", + FT_NONE, BASE_NONE, NULL, 0x0, + NULL, HFILL }}, + { &hf_ripng_rte_ipv6_prefix, + { "IPv6 Prefix", "ripng.rte.ipv6_prefix", + FT_IPv6, BASE_NONE, NULL, 0x0, + "Destination", HFILL }}, + { &hf_ripng_rte_route_tag, + { "Route Tag", "ripng.rte.route_tag", + FT_UINT16, BASE_HEX, NULL, 0x0, + "Provides a method of separating internal RIPng routes (routes for networks within the RIPng routing domain) from external RIPng routes, which may have been imported from an EGP or another IGP", HFILL }}, + + { &hf_ripng_rte_prefix_length, + { "Prefix Length", "ripng.rte.prefix_length", + FT_UINT8, BASE_DEC, NULL, 0x0, + "The length in bits of the significant part of the prefix starting from the left of the prefix", HFILL }}, + + { &hf_ripng_rte_metric, + { "Metric", "ripng.rte.metric", + FT_UINT8, BASE_DEC, NULL, 0x0, + "The current metric for the destination; the value 16 (infinity) indicates that the destination is not reachable", HFILL }}, + }; + + static gint *ett[] = { + &ett_ripng, + &ett_ripng_rte, + }; + + proto_ripng = proto_register_protocol("RIPng", "RIPng", "ripng"); + proto_register_field_array(proto_ripng, hf, array_length(hf)); + proto_register_subtree_array(ett, array_length(ett)); + + ripng_handle = register_dissector("ripng", dissect_ripng, proto_ripng); +} + +void +proto_reg_handoff_ripng(void) +{ + dissector_add_uint_with_preference("udp.port", UDP_PORT_RIPNG, ripng_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: + */ |