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packet-lisp.c
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/* packet-lisp.c
* Routines for Locator/ID Separation Protocol (LISP) Control Message dissection
* Copyright 2011, Lorand Jakab <[email protected]>
*
* $Id: packet-lisp.c 48836 2013-04-13 14:56:19Z pascal $
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <[email protected]>
* Copyright 1998 Gerald Combs
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
* USA.
*/
#include "config.h"
#include <epan/packet.h>
#include <epan/afn.h>
#include <epan/ipv6-utils.h>
#include <epan/expert.h>
#define INET_ADDRLEN 4
#define INET6_ADDRLEN 16
/*
* See RFC 6830 "Locator/ID Separation Protocol (LISP)",
* draft-ietf-lisp-lcaf-02 "LISP Canonical Address Format (LCAF)",
* draft-ietf-lisp-sec-04 "LISP-Security (LISP-SEC)", and
* draft-ermagan-lisp-nat-traversal-03 "NAT traversal for LISP" for packet
* format and protocol information.
*/
#define LCAF_DRAFT_VERSION 10
#define LISP_CONTROL_PORT 4342
/* LISP Control Message types */
#define LISP_MAP_REQUEST 1
#define LISP_MAP_REPLY 2
#define LISP_MAP_REGISTER 3
#define LISP_MAP_NOTIFY 4
#define LISP_MAP_REFERRAL 6
#define LISP_INFO 7
#define LISP_ECM 8
#define LISP_ACT_NONE 0
#define LISP_ACT_FWD_NATIVE 1
#define LISP_ACT_MREQ 2
#define LISP_ACT_DROP 3
#define DDT_NODE_REF 0
#define DDT_MS_REF 1
#define DDT_MS_ACK 2
#define DDT_MS_NREG 3
#define DDT_DLGT_HOLE 4
#define DDT_NAUTH 5
#define LCAF_NULL 0
#define LCAF_AFI_LIST 1
#define LCAF_IID 2
#define LCAF_ASN 3
#define LCAF_APP_DATA 4
#define LCAF_GEO 5
#define LCAF_OKEY 6
#define LCAF_NATT 7
#define LCAF_NONCE_LOC 8
#define LCAF_MCAST_INFO 9
#define LCAF_ELP 10
#define LCAF_SEC_KEY 11
#define LCAF_SRC_DST_KEY 12
#define LCAF_HEADER_LEN 6
#define LISP_ECM_HEADER_LEN 4
#define LISP_XTRID_LEN 16
#define LISP_SITEID_LEN 8
#define LISP_MAP_ACT 0xE000
#define LISP_MAP_AUTH 0x1000
#define REFERRAL_INCOMPLETE 0x0800
#define LOCAL_BIT_MASK 0x0004
#define PROBE_BIT_MASK 0x0002
#define REACH_BIT_MASK 0x0001
#define MAP_REQ_FLAG_A 0x080000
#define MAP_REQ_FLAG_M 0x040000
#define MAP_REQ_FLAG_P 0x020000
#define MAP_REQ_FLAG_S 0x010000
#define MAP_REQ_FLAG_p 0x008000
#define MAP_REQ_FLAG_s 0x004000
#define MAP_REQ_RESERVED 0x003FE0
#define MAP_REP_FLAG_P 0x080000
#define MAP_REP_FLAG_E 0x040000
#define MAP_REP_FLAG_S 0x020000
#define MAP_REP_RESERVED 0x01FFFF
#define MAP_REG_FLAG_P 0x080000
#define MAP_REG_FLAG_S 0x040000
#define MAP_REG_FLAG_I 0x020000
#define MAP_REG_FLAG_R 0x010000
#define MAP_REG_RESERVED 0x00FFFE
#define MAP_REG_FLAG_M 0x000001
#define MAP_NOT_FLAG_I 0x080000
#define MAP_NOT_FLAG_R 0x040000
#define MAP_NOT_RESERVED 0x03FFFF
#define MAP_REF_RESERVED 0x0FFFFF
#define INFO_FLAG_R 0x080000
#define INFO_RESERVED 0x07FFFFFF
#define ECM_FLAG_S 0x08000000
#define ECM_FLAG_D 0x04000000
/* Initialize the protocol and registered fields */
static int proto_lisp = -1;
static int hf_lisp_type = -1;
static int hf_lisp_irc = -1;
static int hf_lisp_records = -1;
static int hf_lisp_nonce = -1;
static int hf_lisp_keyid = -1;
static int hf_lisp_authlen = -1;
static int hf_lisp_auth = -1;
static int hf_lisp_msrtr_keyid = -1;
static int hf_lisp_msrtr_authlen = -1;
static int hf_lisp_msrtr_auth = -1;
static int hf_lisp_xtrid = -1;
static int hf_lisp_siteid = -1;
/* Map-Request fields */
static int hf_lisp_mreq_flags_auth = -1;
static int hf_lisp_mreq_flags_mrp = -1;
static int hf_lisp_mreq_flags_probe = -1;
static int hf_lisp_mreq_flags_smr = -1;
static int hf_lisp_mreq_flags_pitr = -1;
static int hf_lisp_mreq_flags_smri = -1;
static int hf_lisp_mreq_res = -1;
static int hf_lisp_mreq_srceid_afi = -1;
static int hf_lisp_mreq_srceid = -1;
static int hf_lisp_mreq_srceidv6 = -1;
static int hf_lisp_mreq_srcitr = -1;
static int hf_lisp_mreq_srcitrv6 = -1;
/* Map-Reply fields */
static int hf_lisp_mrep_flags_probe = -1;
static int hf_lisp_mrep_flags_enlr = -1;
static int hf_lisp_mrep_flags_sec = -1;
static int hf_lisp_mrep_res = -1;
/* Map-Register fields */
static int hf_lisp_mreg_flags_pmr = -1;
static int hf_lisp_mreg_flags_sec = -1;
static int hf_lisp_mreg_flags_xtrid = -1;
static int hf_lisp_mreg_flags_rtr = -1;
static int hf_lisp_mreg_flags_wmn = -1;
static int hf_lisp_mreg_res = -1;
/* Map-Notify fields */
static int hf_lisp_mnot_flags_xtrid = -1;
static int hf_lisp_mnot_flags_rtr = -1;
static int hf_lisp_mnot_res = -1;
/* Map-Referral fields */
static int hf_lisp_mref_res = -1;
static int hf_lisp_referral_sigcnt = -1;
static int hf_lisp_referral_incomplete = -1;
/* Info fields */
static int hf_lisp_info_r = -1;
static int hf_lisp_info_res1 = -1;
static int hf_lisp_info_ttl = -1;
static int hf_lisp_info_res2 = -1;
static int hf_lisp_info_afi = -1;
/* Mapping record fields */
static int hf_lisp_mapping_ttl = -1;
static int hf_lisp_mapping_loccnt = -1;
static int hf_lisp_mapping_eid_masklen = -1;
static int hf_lisp_mapping_act = -1;
static int hf_lisp_mapping_auth = -1;
static int hf_lisp_mapping_res1 = -1;
static int hf_lisp_mapping_res2 = -1;
static int hf_lisp_mapping_ver = -1;
static int hf_lisp_mapping_eid_afi = -1;
static int hf_lisp_mapping_eid = -1;
/* LCAF fields */
static int hf_lisp_lcaf_res1 = -1;
static int hf_lisp_lcaf_flags = -1;
static int hf_lisp_lcaf_type = -1;
static int hf_lisp_lcaf_res2 = -1;
static int hf_lisp_lcaf_length = -1;
/* LCAF IID fields */
static int hf_lisp_lcaf_iid = -1;
/* LCAF NATT fields */
static int hf_lisp_lcaf_natt_msport = -1;
static int hf_lisp_lcaf_natt_etrport = -1;
/* Encapsulated Control Message fields */
static int hf_lisp_ecm_flags_sec = -1;
static int hf_lisp_ecm_flags_ddt = -1;
static int hf_lisp_ecm_res = -1;
/* Initialize the subtree pointers */
static gint ett_lisp = -1;
static gint ett_lisp_mr = -1;
static gint ett_lisp_mapping = -1;
static gint ett_lisp_itr = -1;
static gint ett_lisp_record = -1;
static gint ett_lisp_lcaf = -1;
static gint ett_lisp_elp = -1;
static dissector_handle_t ipv4_handle;
static dissector_handle_t ipv6_handle;
static dissector_handle_t data_handle;
static gboolean encapsulated = FALSE;
static gboolean ddt_originated = FALSE;
const value_string lisp_typevals[] = {
{ LISP_MAP_REQUEST, "Map-Request" },
{ LISP_MAP_REPLY, "Map-Reply" },
{ LISP_MAP_REGISTER, "Map-Register" },
{ LISP_MAP_NOTIFY, "Map-Notify" },
{ LISP_MAP_REFERRAL, "Map-Referral" },
{ LISP_INFO, "Info" },
{ LISP_ECM, "Encapsulated Control Message" },
{ 0, NULL}
};
const value_string mapping_actions[] = {
{ LISP_ACT_NONE, "No-Action" },
{ LISP_ACT_FWD_NATIVE, "Natively-Forward" },
{ LISP_ACT_MREQ, "Send-Map-Request" },
{ LISP_ACT_DROP, "Drop" },
{ 0, NULL}
};
const value_string referral_actions[] = {
{ DDT_NODE_REF, "Node Referral" },
{ DDT_MS_REF, "Map-Server Referral" },
{ DDT_MS_ACK, "Map-Server ACK" },
{ DDT_MS_NREG, "Map-Server Not Registered" },
{ DDT_DLGT_HOLE, "Delegation Hole" },
{ DDT_NAUTH, "Not Authoritative" },
{ 0, NULL}
};
const value_string lcaf_typevals[] = {
{ LCAF_NULL, "Null Body" },
{ LCAF_AFI_LIST, "AFI List" },
{ LCAF_IID, "Instance ID" },
{ LCAF_ASN, "AS Number" },
{ LCAF_APP_DATA, "Application Data" },
{ LCAF_GEO, "Geo Coordinates" },
{ LCAF_OKEY, "Opaque Key" },
{ LCAF_NATT, "NAT Traversal" },
{ LCAF_NONCE_LOC, "Nonce Locator" },
{ LCAF_MCAST_INFO, "Multicast Info" },
{ LCAF_ELP, "Explicit Locator Path" },
{ LCAF_SEC_KEY, "Security Key" },
{ LCAF_SRC_DST_KEY, "Source/Dest Key" },
{ 0, NULL}
};
static int
dissect_lcaf(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, gint offset);
static int
get_lcaf_data(tvbuff_t *tvb, gint offset, guint8 *lcaf_type, guint16 *len)
{
/* Jump over Rsvd1 and Flags (16 bits) */
offset += 2;
/* Type (8 bits) */
if (lcaf_type)
*lcaf_type = tvb_get_guint8(tvb, offset);
offset += 1;
/* Jump over Rsvd2 bits (8 bits) */
offset += 1;
/* Length (16 bits) */
if (len)
/* Adding the size of the LCAF header as well */
*len = tvb_get_ntohs(tvb, offset) + LCAF_HEADER_LEN;
offset += 2;
return offset;
}
static const gchar *
get_addr_str(tvbuff_t *tvb, gint offset, guint16 afi, guint16 *addr_len)
{
const gchar *notset_str = "not set";
const gchar *addr_str;
guint32 locator_v4;
struct e_in6_addr locator_v6;
guint8 lcaf_type;
guint32 iid;
guint16 cur_len;
switch (afi) {
case AFNUM_RESERVED:
*addr_len = 0;
return notset_str;
case AFNUM_INET:
locator_v4 = tvb_get_ipv4(tvb, offset);
*addr_len = INET_ADDRLEN;
addr_str = ip_to_str((guint8 *)&locator_v4);
return addr_str;
case AFNUM_INET6:
tvb_get_ipv6(tvb, offset, &locator_v6);
*addr_len = INET6_ADDRLEN;
addr_str = ip6_to_str(&locator_v6);
return addr_str;
case AFNUM_LCAF:
get_lcaf_data(tvb, offset, &lcaf_type, addr_len);
addr_str = val_to_str(lcaf_type, lcaf_typevals, "Unknown LCAF Type (%d)");
if (lcaf_type == LCAF_IID) {
iid = tvb_get_ntohl(tvb, offset + LCAF_HEADER_LEN);
afi = tvb_get_ntohs(tvb, offset + LCAF_HEADER_LEN + 4);
addr_str = get_addr_str(tvb, offset + LCAF_HEADER_LEN + 6, afi, &cur_len);
return ep_strdup_printf("[%d] %s", iid, addr_str);
}
return addr_str;
default:
return NULL;
}
}
static int
dissect_lcaf_natt_rloc(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree,
gint offset, const gchar *str, int idx)
{
guint16 addr_len = 0;
guint16 rloc_afi;
const gchar *rloc_str;
rloc_afi = tvb_get_ntohs(tvb, offset); offset += 2;
rloc_str = get_addr_str(tvb, offset, rloc_afi, &addr_len);
if (rloc_str == NULL) {
expert_add_info_format(pinfo, tree, PI_PROTOCOL, PI_ERROR,
"Unexpected RLOC AFI (%d), cannot decode", rloc_afi);
return offset;
}
if (idx) {
proto_tree_add_text(tree, tvb, offset - 2, 2 + addr_len, str, idx, rloc_str);
} else {
proto_tree_add_text(tree, tvb, offset - 2, 2 + addr_len, str, rloc_str);
}
return addr_len + 2;
}
static int
dissect_lcaf_elp_hop(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree,
gint offset, int idx)
{
guint16 addr_len = 0;
guint16 hop_afi;
guint16 hop_flags;
const gchar *hop_str;
proto_item *ti;
hop_afi = tvb_get_ntohs(tvb, offset); offset += 2;
hop_flags = tvb_get_ntohs(tvb, offset); offset += 2;
hop_str = get_addr_str(tvb, offset, hop_afi, &addr_len);
if (hop_str == NULL) {
expert_add_info_format(pinfo, tree, PI_PROTOCOL, PI_ERROR,
"Unexpected reencap hop AFI (%d), cannot decode", hop_afi);
return offset;
}
if (idx) {
ti = proto_tree_add_text(tree, tvb, offset - 4, addr_len + 4, "Reencap hop %d: %s", idx, hop_str);
} else {
ti = proto_tree_add_text(tree, tvb, offset - 4, addr_len + 4, "Reencap hop: %s", hop_str);
}
if (hop_flags & 0x04)
proto_item_append_text(ti, ", Lookup");
if (hop_flags & 0x02)
proto_item_append_text(ti, ", RLOC-Probe");
if (hop_flags & 0x01)
proto_item_append_text(ti, ", Strict");
return addr_len + 4;
}
/*
* Dissector code for AFI List
*
*/
static int
dissect_lcaf_afi_list(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree,
gint offset, guint16 length)
{
gint old_offset;
gint remaining = length;
gint i = 1;
guint16 addr_len = 0;
guint16 afi;
guint32 ipv4;
struct e_in6_addr ipv6;
const gchar *lcaf_str;
proto_item *tir;
proto_tree *lisp_elp_tree;
while (remaining > 0) {
afi = tvb_get_ntohs(tvb, offset); offset += 2; remaining -= 2;
switch (afi) {
case AFNUM_INET:
ipv4 = tvb_get_ipv4(tvb, offset);
proto_tree_add_text(tree, tvb, offset - 2, 2 + INET_ADDRLEN,
"%d. IPv4 Addess: %s", i, ip_to_str((guint8 *)&ipv4));
offset += INET_ADDRLEN;
remaining -= INET_ADDRLEN;
break;
case AFNUM_INET6:
tvb_get_ipv6(tvb, offset, &ipv6);
proto_tree_add_text(tree, tvb, offset - 2, 2 + INET6_ADDRLEN,
"%d. IPv6 Addess: %s", i, ip6_to_str(&ipv6));
offset += INET6_ADDRLEN;
remaining -= INET6_ADDRLEN;
break;
case AFNUM_LCAF:
old_offset = offset;
lcaf_str = get_addr_str(tvb, offset, afi, &addr_len);
tir = proto_tree_add_text(tree, tvb, offset - 2, 2 + addr_len,
"%d. %s", i, lcaf_str);
/* XXX need to check LCAF type */
lisp_elp_tree = proto_item_add_subtree(tir, ett_lisp_elp);
offset = dissect_lcaf(tvb, pinfo, lisp_elp_tree, offset);
remaining -= (offset - old_offset);
break;
default:
expert_add_info_format(pinfo, tree, PI_PROTOCOL, PI_ERROR,
"Unexpected AFI (%d), cannot decode", afi);
return -1;
}
i++;
}
return offset;
}
/*
* Dissector code for Instance ID
*
* 0 1 2 3
* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | AFI = 16387 | Rsvd1 | Flags |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Type = 2 | Rsvd2 | 4 + n |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Instance ID |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | AFI = x | Address ... |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*
*/
static int
dissect_lcaf_iid(tvbuff_t *tvb, proto_tree *tree, gint offset)
{
/* For now, we don't print reserved and length fields */
offset += 3;
proto_tree_add_item(tree, hf_lisp_lcaf_iid, tvb, offset, 4, ENC_BIG_ENDIAN);
offset += 4;
return offset;
}
/*
* Dissector code for NAT-Traversal
*
* 0 1 2 3
* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | AFI = 16387 | Rsvd1 | Flags |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Type = 7 | Rsvd2 | 4 + n |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | MS UDP Port Number | ETR UDP Port Number |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | AFI = x | Global ETR RLOC Address ... |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | AFI = x | MS RLOC Address ... |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | AFI = x | Private ETR RLOC Address ... |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | AFI = x | RTR RLOC Address 1 ... |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | AFI = x | RTR RLOC Address n ... |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*
*/
static int
dissect_lcaf_natt(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree,
gint offset, guint16 length)
{
gint i;
gint len;
gint remaining = length;
const gchar *global_etr = "Global ETR RLOC: %s";
const gchar *ms = "MS RLOC: %s";
const gchar *private_etr = "Private ETR RLOC: %s";
const gchar *rtr = "RTR RLOC %d: %s";
remaining -= 4;
proto_tree_add_item(tree, hf_lisp_lcaf_natt_msport, tvb, offset, 2, ENC_BIG_ENDIAN);
offset += 2;
remaining -= 2;
proto_tree_add_item(tree, hf_lisp_lcaf_natt_etrport, tvb, offset, 2, ENC_BIG_ENDIAN);
offset += 2;
remaining -= 2;
len = dissect_lcaf_natt_rloc(tvb, pinfo, tree, offset, global_etr, 0);
offset += len;
remaining -= len;
len = dissect_lcaf_natt_rloc(tvb, pinfo, tree, offset, ms, 0);
offset += len;
remaining -= len;
len = dissect_lcaf_natt_rloc(tvb, pinfo, tree, offset, private_etr, 0);
offset += len;
remaining -= len;
i = 1;
while (remaining > 0) {
len = dissect_lcaf_natt_rloc(tvb, pinfo, tree, offset, rtr, i);
offset += len;
remaining -= len;
i++;
}
return offset;
}
/*
* Dissector code for Explicit Locator Path
*
* 0 1 2 3
* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | AFI = 16387 | Rsvd1 | Flags |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Type = 10 | Rsvd2 | n |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | AFI = x | Rsvd3 |L|P|S|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Reencap Hop 1 ... |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | AFI = x | Rsvd3 |L|P|S|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Reencap Hop k ... |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*
*/
static int
dissect_lcaf_elp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree,
gint offset, guint16 length)
{
gint len;
gint remaining = length;
gint i = 1;
while (remaining > 0) {
len = dissect_lcaf_elp_hop(tvb, pinfo, tree, offset, i);
offset += len;
remaining -= len;
i++;
}
return offset;
}
/*
* Dissector code for LISP Canonical Address Format (LCAF)
*
* 0 1 2 3
* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | AFI = 16387 | Rsvd1 | Flags |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Type | Rsvd2 | Length |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*
* Type 0: Null Body Type
* Type 1: AFI List Type
* Type 2: Instance ID Type
* Type 3: AS Number Type
* Type 4: Application Data Type
* Type 5: Geo Coordinates Type
* Type 6: Opaque Key Type
* Type 7: NAT-Traversal Type
* Type 8: Nonce Locator Type
* Type 9: Multicast Info Type
* Type 10: Explicit Locator Path Type
* Type 11: Security Key Type
* Type 12: Source/Dest Key Type
*
*/
static int
dissect_lcaf(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, gint offset)
{
guint8 lcaf_type;
guint16 len;
proto_item *tir;
proto_tree *lcaf_tree;
lcaf_type = tvb_get_guint8(tvb, offset + 2);
len = tvb_get_ntohs(tvb, offset + 4);
tir = proto_tree_add_text(tree, tvb, offset, 6,
"LCAF Header (Type: %s, Length: %d bytes)",
val_to_str(lcaf_type, lcaf_typevals, "Unknown (%d)"),
len);
lcaf_tree = proto_item_add_subtree(tir, ett_lisp_lcaf);
/* Reserved bits (8 bits) */
proto_tree_add_item(lcaf_tree, hf_lisp_lcaf_res1, tvb, offset, 1, ENC_BIG_ENDIAN);
offset += 1;
/* Flags (8 bits) */
proto_tree_add_item(lcaf_tree, hf_lisp_lcaf_flags, tvb, offset, 1, ENC_BIG_ENDIAN);
offset += 1;
/* Type (8 bits) */
proto_tree_add_item(lcaf_tree, hf_lisp_lcaf_type, tvb, offset, 1, ENC_BIG_ENDIAN);
offset += 1;
/* Reserved bits (8 bits) */
proto_tree_add_item(lcaf_tree, hf_lisp_lcaf_res2, tvb, offset, 1, ENC_BIG_ENDIAN);
offset += 1;
/* Length (16 bits) */
proto_tree_add_item(lcaf_tree, hf_lisp_lcaf_length, tvb, offset, 2, ENC_BIG_ENDIAN);
offset += 2;
switch (lcaf_type) {
case LCAF_NULL:
break;
case LCAF_AFI_LIST:
offset = dissect_lcaf_afi_list(tvb, pinfo, tree, offset, len);
break;
case LCAF_IID:
offset = dissect_lcaf_iid(tvb, tree, offset);
break;
case LCAF_NATT:
offset = dissect_lcaf_natt(tvb, pinfo, tree, offset, len);
break;
case LCAF_ELP:
offset = dissect_lcaf_elp(tvb, pinfo, tree, offset, len);
break;
default:
if (lcaf_type < 13)
expert_add_undecoded_item(tvb, pinfo, tree, offset,
len, PI_WARN);
else
expert_add_info_format(pinfo, tree, PI_PROTOCOL, PI_ERROR,
"LCAF type %d is not defined in draft-farinacci-lisp-lcaf-%d",
lcaf_type, LCAF_DRAFT_VERSION);
return offset + len;
}
return offset;
}
/*
* Dissector code for locator records within control packets
*
* 0 1 2 3
* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Priority | Weight | M Priority | M Weight |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Unused Flags |L|p|R| Loc-AFI |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Locator |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*
*/
static int
dissect_lisp_locator(tvbuff_t *tvb, packet_info *pinfo, proto_tree *lisp_mapping_tree)
{
gint offset = 0;
guint16 addr_len = 0;
guint8 prio;
guint8 weight;
guint8 m_prio;
guint8 m_weight;
guint16 flags;
guint16 loc_afi;
const gchar *locator;
proto_item *tir;
proto_tree *lisp_elp_tree;
prio = tvb_get_guint8(tvb, offset); offset += 1;
weight = tvb_get_guint8(tvb, offset); offset += 1;
m_prio = tvb_get_guint8(tvb, offset); offset += 1;
m_weight = tvb_get_guint8(tvb, offset); offset += 1;
flags = tvb_get_ntohs(tvb, offset); offset += 2;
loc_afi = tvb_get_ntohs(tvb, offset); offset += 2;
locator = get_addr_str(tvb, offset, loc_afi, &addr_len);
if (locator == NULL) {
expert_add_info_format(pinfo, lisp_mapping_tree, PI_PROTOCOL, PI_ERROR,
"Unexpected locator AFI (%d), cannot decode", loc_afi);
return offset;
}
tir = proto_tree_add_text(lisp_mapping_tree, tvb, 0, 8 + addr_len,
"%sRLOC: %s%s, %s, Priority/Weight: %d/%d, Multicast Priority/Weight: %d/%d",
(flags&LOCAL_BIT_MASK) ? "Local " : "",
locator,
(flags&PROBE_BIT_MASK) ? " (probed)" : "",
(flags&REACH_BIT_MASK) ? "Reachable" : "Unreachable",
prio, weight, m_prio, m_weight);
if (loc_afi == AFNUM_LCAF) {
/* Create a sub-tree for the mapping */
lisp_elp_tree = proto_item_add_subtree(tir, ett_lisp_elp);
offset = dissect_lcaf(tvb, pinfo, lisp_elp_tree, offset);
} else {
offset += addr_len;
}
return offset;
}
/*
* Dissector code for mapping records within control packets
*
* 0 1 2 3
* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Record TTL |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Locator Count | EID mask-len | ACT |A| Reserved |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Rsvd | Map-Version Number | EID-AFI |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | EID-prefix |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*
*/
static int
dissect_lisp_mapping(tvbuff_t *tvb, packet_info *pinfo, proto_tree *lisp_tree,
guint8 rec_cnt, gboolean referral)
{
int i;
gint offset = 0;
gint offset_rec = 0;
guint32 ttl;
guint16 addr_len = 0;
guint8 loc_cnt;
guint8 prefix_mask;
guint16 flags;
guint16 act;
guint16 prefix_afi;
const gchar *prefix;
proto_item *tir;
proto_tree *lisp_mapping_tree;
ttl = tvb_get_ntohl(tvb, offset); offset += 4;
loc_cnt = tvb_get_guint8(tvb, offset); offset += 1;
prefix_mask = tvb_get_guint8(tvb, offset); offset += 1;
flags = tvb_get_ntohs(tvb, offset); offset += 4;
prefix_afi = tvb_get_ntohs(tvb, offset); offset += 2;
act = flags & LISP_MAP_ACT;
act >>= 13;
prefix = get_addr_str(tvb, offset, prefix_afi, &addr_len);
if (prefix == NULL) {
expert_add_info_format(pinfo, lisp_tree, PI_PROTOCOL, PI_ERROR,
"Unexpected EID prefix AFI (%d), cannot decode", prefix_afi);
return offset;
}
tir = proto_tree_add_text(lisp_tree, tvb, 0, 12 + addr_len,
"EID prefix: %s/%d, TTL: %s, %sAuthoritative, %s%s",
prefix, prefix_mask,
(ttl == 0xFFFFFFFF) ? "Unlimited" : ep_strdup_printf("%d", ttl),
(flags&LISP_MAP_AUTH) ? "" : "Not ",
val_to_str(act, (referral) ? referral_actions : mapping_actions, "Invalid action code (%d)"),
(referral&&(flags&REFERRAL_INCOMPLETE)) ? " (Incomplete)" : "");
offset += addr_len;
/* Update the INFO column if there is only one record */
if (rec_cnt == 1)
col_append_fstr(pinfo->cinfo, COL_INFO, " for %s/%d",
prefix, prefix_mask);
/* Create a sub-tree for the mapping */
lisp_mapping_tree = proto_item_add_subtree(tir, ett_lisp_mapping);
/* TTL (32 bits) */
proto_tree_add_item(lisp_mapping_tree, hf_lisp_mapping_ttl, tvb, offset_rec, 4, ENC_BIG_ENDIAN);
offset_rec += 4;
/* Locator count (8 bits) */
proto_tree_add_item(lisp_mapping_tree, hf_lisp_mapping_loccnt, tvb, offset_rec, 1, ENC_BIG_ENDIAN);
offset_rec += 1;
/* EID mask length (8 bits) */
proto_tree_add_item(lisp_mapping_tree, hf_lisp_mapping_eid_masklen, tvb, offset_rec, 1, ENC_BIG_ENDIAN);
offset_rec += 1;
/* Action (3 bits) */
proto_tree_add_item(lisp_mapping_tree, hf_lisp_mapping_act, tvb, offset_rec, 2, ENC_BIG_ENDIAN);
/* Authoritative bit */
proto_tree_add_item(lisp_mapping_tree, hf_lisp_mapping_auth, tvb, offset_rec, 2, ENC_BIG_ENDIAN);
/* Incomplete bit in Map-Referrals */
if (referral)
proto_tree_add_item(lisp_mapping_tree, hf_lisp_referral_incomplete, tvb, offset_rec, 2, ENC_BIG_ENDIAN);
/* Reserved (11 bits) */
proto_tree_add_item(lisp_mapping_tree, hf_lisp_mapping_res1, tvb, offset_rec, 2, ENC_BIG_ENDIAN);
offset_rec += 2;
if (referral) {
/* SigCnt (4 bits) */
proto_tree_add_item(lisp_mapping_tree, hf_lisp_referral_sigcnt, tvb, offset_rec, 2, ENC_BIG_ENDIAN);
} else {
/* Reserved (4 bits) */
proto_tree_add_item(lisp_mapping_tree, hf_lisp_mapping_res2, tvb, offset_rec, 2, ENC_BIG_ENDIAN);
}
/* Map-Version Number (12 bits) */
proto_tree_add_item(lisp_mapping_tree, hf_lisp_mapping_ver, tvb, offset_rec, 2, ENC_BIG_ENDIAN);
offset_rec += 2;
/* EID prefix AFI (16 bits) */
proto_tree_add_item(lisp_mapping_tree, hf_lisp_mapping_eid_afi, tvb, offset_rec, 2, ENC_BIG_ENDIAN);
offset_rec += 2;
/* EID */
proto_tree_add_string(lisp_mapping_tree, hf_lisp_mapping_eid, tvb, offset_rec, offset - offset_rec, prefix);
/* Locators */
for(i=0; i < loc_cnt; i++) {
tvbuff_t *loc_tvb;
int len = 0;
loc_tvb = tvb_new_subset_remaining(tvb, offset);
len = dissect_lisp_locator(loc_tvb, pinfo, lisp_mapping_tree);
offset += len;
}
return offset;
}
/*
* Dissector code for Map-Request type control packets
*
* 0 1 2 3
* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* |Type=1 |A|M|P|S|p|s| Reserved | IRC | Record Count |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Nonce . . . |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | . . . Nonce |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Source-EID-AFI | Source EID Address ... |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | ITR-RLOC-AFI 1 | ITR-RLOC Address 1 ... |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | ... |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | ITR-RLOC-AFI n | ITR-RLOC Address n ... |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* / | Reserved | EID mask-len | EID-prefix-AFI |
* Rec +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* \ | EID-prefix ... |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Map-Reply Record ... |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*
*/
static void
dissect_lisp_map_request(tvbuff_t *tvb, packet_info *pinfo, proto_tree *lisp_tree)
{
int i;
guint16 addr_len = 0;
gint offset = 0;
guint16 flags;
gboolean mrep = FALSE;
gboolean smr = FALSE;
gboolean probe = FALSE;
gboolean pitr = FALSE;
gboolean smr_invoked = FALSE;
guint8 itr_rec_cnt = 0;
guint8 rec_cnt = 0;
guint16 src_eid_afi;
const gchar *src_eid;
struct e_in6_addr e_in6_addr;
tvbuff_t *next_tvb;
/* Flags (6 bits)*/
flags = tvb_get_ntohs(tvb, offset);
mrep = flags & (MAP_REQ_FLAG_M >> 8);
smr = flags & (MAP_REQ_FLAG_S >> 8);
probe = flags & (MAP_REQ_FLAG_P >> 8);
pitr = flags & (MAP_REQ_FLAG_p >> 8);
smr_invoked = flags & (MAP_REQ_FLAG_s >> 8);
proto_tree_add_item(lisp_tree, hf_lisp_mreq_flags_auth, tvb, offset, 3, ENC_BIG_ENDIAN);
proto_tree_add_item(lisp_tree, hf_lisp_mreq_flags_mrp, tvb, offset, 3, ENC_BIG_ENDIAN);
proto_tree_add_item(lisp_tree, hf_lisp_mreq_flags_probe, tvb, offset, 3, ENC_BIG_ENDIAN);
proto_tree_add_item(lisp_tree, hf_lisp_mreq_flags_smr, tvb, offset, 3, ENC_BIG_ENDIAN);
proto_tree_add_item(lisp_tree, hf_lisp_mreq_flags_pitr, tvb, offset, 3, ENC_BIG_ENDIAN);
proto_tree_add_item(lisp_tree, hf_lisp_mreq_flags_smri, tvb, offset, 3, ENC_BIG_ENDIAN);
if (pitr)
col_append_str(pinfo->cinfo, COL_INFO, " by P-ITR");
if (smr)
col_append_str(pinfo->cinfo, COL_INFO, " (SMR)");
if (probe)
col_append_str(pinfo->cinfo, COL_INFO, " (RLOC-probe)");
if (smr_invoked)
col_append_str(pinfo->cinfo, COL_INFO, " (SMR-invoked)");
/* Reserved bits (9 bits) */
proto_tree_add_item(lisp_tree, hf_lisp_mreq_res, tvb, offset, 3, ENC_BIG_ENDIAN);
/* ITR record count (5 bits) */
itr_rec_cnt = tvb_get_guint8(tvb, offset + 2) & 0x1F;
proto_tree_add_item(lisp_tree, hf_lisp_irc, tvb, offset, 3, ENC_BIG_ENDIAN);
offset += 3;
/* Record count (8 bits) */
rec_cnt = tvb_get_guint8(tvb, offset);
proto_tree_add_item(lisp_tree, hf_lisp_records, tvb, offset, 1, ENC_BIG_ENDIAN);
offset += 1;
/* Nonce (64 bits) */
proto_tree_add_item(lisp_tree, hf_lisp_nonce, tvb, offset, 8, ENC_BIG_ENDIAN);
offset += 8;
/* Source EID AFI (16 bits) */
src_eid_afi = tvb_get_ntohs(tvb, offset);
proto_tree_add_item(lisp_tree, hf_lisp_mreq_srceid_afi, tvb, offset, 2, ENC_BIG_ENDIAN);
offset += 2;
/* Source EID */
switch (src_eid_afi) {
case AFNUM_RESERVED:
proto_tree_add_text(lisp_tree, tvb, offset, 0, "Source EID: not set");
break;
case AFNUM_INET:
proto_tree_add_ipv4(lisp_tree,
hf_lisp_mreq_srceid, tvb, offset, INET_ADDRLEN, tvb_get_ipv4(tvb, offset));
offset += INET_ADDRLEN;