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CDP: Resolve 802.2 Protocol type protocols, show IPv6 

Protocols of protocol type 802.2 (PT = 2) are encoded with the
"normal" ethernet type when PT length == 8.

Used reference: https://docs.fd.io/vpp/17.10/d2/d71/cdp__protocol_8h_source.html

Show IPv6 addresses as IPv6 and not as bytes.

Change-Id: I0f192e758bcc1a562f042609fa5d0d9527551bb8
Bug: 14311
Reviewed-on: https://code.wireshark.org/review/25168
Petri-Dish: Anders Broman <a.broman58@gmail.com>
Tested-by: Petri Dish Buildbot
Reviewed-by: Anders Broman <a.broman58@gmail.com>
This commit is contained in:
Uli Heilmeier 2018-01-05 22:58:49 +01:00 committed by Anders Broman
parent b3394a76ab
commit 6f93baced0
1 changed files with 21 additions and 0 deletions
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21
epan/dissectors/packet-cdp.c
View File

@ -28,6 +28,7 @@
#include <epan/to_str.h>
#include <epan/in_cksum.h>
#include <epan/nlpid.h>
#include <epan/etypes.h>
/*
@ -91,6 +92,7 @@ static int hf_cdp_nrgyz_reply_to_name = -1;
static int hf_cdp_nrgyz_reply_to_domain = -1;
static int hf_cdp_nrgyz_reply_to_role = -1;
static int hf_cdp_nrgyz_ip_address = -1;
static int hf_cdp_nrgyz_ip6_address = -1;
static int hf_cdp_model_number = -1;
static int hf_cdp_nrgyz_reply_to_unknown_field = -1;
static int hf_cdp_len_tlv_table = -1;
@ -1033,6 +1035,7 @@ dissect_address_tlv(tvbuff_t *tvb, int offset, int length, proto_tree *tree)
guint8 protocol_length;
int nlpid;
guint16 address_length;
guint16 etypeid = 0;
int hf_addr = -1;
if (length < 1)
@ -1062,6 +1065,10 @@ dissect_address_tlv(tvbuff_t *tvb, int offset, int length, proto_tree *tree)
nlpid = tvb_get_guint8(tvb, offset);
proto_tree_add_bytes_format_value(address_tree, hf_cdp_protocol, tvb, offset, protocol_length, NULL, "%s",
val_to_str(nlpid, nlpid_vals, "Unknown (0x%02x)"));
} else if ((protocol_type == PROTO_TYPE_IEEE_802_2) && (protocol_length == 8) && (tvb_get_ntoh48(tvb, offset) == 0xAAAA03000000)) {
etypeid = tvb_get_ntohs(tvb, offset + 6);
proto_tree_add_bytes_format_value(address_tree, hf_cdp_protocol, tvb, offset, protocol_length, NULL, "%s",
val_to_str(etypeid, etype_vals, "Unknown (0x%04x)"));
} else {
nlpid = -1;
proto_tree_add_item(address_tree, hf_cdp_protocol, tvb, offset, protocol_length, ENC_NA);
@ -1101,6 +1108,19 @@ dissect_address_tlv(tvbuff_t *tvb, int offset, int length, proto_tree *tree)
break;
}
}
if ((protocol_type == PROTO_TYPE_IEEE_802_2) && (protocol_length == 8) && (etypeid > 0)) {
switch (etypeid) {
case ETHERTYPE_IPv6:
if (address_length == 16) {
/* The address is an IPv6 address. */
proto_item_set_text(ti, "IPv6 address: %s", tvb_ip6_to_str(tvb, offset));
hf_addr = hf_cdp_nrgyz_ip6_address;
proto_tree_add_item(address_tree, hf_cdp_nrgyz_ip6_address, tvb, offset, address_length, ENC_NA);
}
break;
}
}
if (hf_addr == -1)
{
@ -1398,6 +1418,7 @@ proto_register_cdp(void)
{ &hf_cdp_nrgyz_reply_to_unknown_field, { "Unknown Field", "cdp.nrgyz_reply_to.unknown_field", FT_UINT16, BASE_HEX, NULL, 0x0, NULL, HFILL }},
{ &hf_cdp_nrgyz_reply_to_port, { "Port", "cdp.nrgyz_reply_to.port", FT_UINT16, BASE_DEC, NULL, 0x0, NULL, HFILL }},
{ &hf_cdp_nrgyz_ip_address, { "IP Address", "cdp.nrgyz.ip_address", FT_IPv4, BASE_NONE, NULL, 0x0, NULL, HFILL }},
{ &hf_cdp_nrgyz_ip6_address, { "IPv6 Address", "cdp.nrgyz.ipv6_address", FT_IPv6, BASE_NONE, NULL, 0x0, NULL, HFILL }},
{ &hf_cdp_nrgyz_reply_to_ip_address, { "IP Address", "cdp.nrgyz_reply_to.ip_address", FT_IPv4, BASE_NONE, NULL, 0x0, NULL, HFILL }},
{ &hf_cdp_nrgyz_reply_to_backup_server_port, { "Backup server Port?", "cdp.nrgyz_reply_to.backup_server_port", FT_UINT16, BASE_DEC, NULL, 0x0, NULL, HFILL }},
{ &hf_cdp_nrgyz_reply_to_backup_server_ip, { "Backup Server IP?", "cdp.nrgyz_reply_to.backup_server_ip", FT_IPv4, BASE_NONE, NULL, 0x0, NULL, HFILL }},