* Routines for BGP packet dissection.
* Copyright 1999, Jun-ichiro itojun Hagino <itojun@itojun.org>
*
- * $Id: packet-bgp.c,v 1.35 2001/04/23 18:19:02 guy Exp $
- *
+ * $Id: packet-bgp.c,v 1.74 2003/01/31 08:09:24 guy Exp $
+ *
* Supports:
* RFC1771 A Border Gateway Protocol 4 (BGP-4)
- * RFC1965 Autonomous System Confederations for BGP
+ * RFC1965 Autonomous System Confederations for BGP
* RFC1997 BGP Communities Attribute
+ * RFC2547 BGP/MPLS VPNs
* RFC2796 BGP Route Reflection An alternative to full mesh IBGP
* RFC2842 Capabilities Advertisement with BGP-4
* RFC2858 Multiprotocol Extensions for BGP-4
* RFC2918 Route Refresh Capability for BGP-4
+ * RFC3107 Carrying Label Information in BGP-4
+ * Draft Ramahandra on Extended Communities Extentions
+ * draft-ietf-idr-as4bytes-06
+ * draft-ietf-idr-dynamic-cap-03
*
* TODO:
* Destination Preference Attribute for BGP (work in progress)
- * RFC1863 A BGP/IDRP Route Server alternative to a full mesh routing
+ * RFC1863 A BGP/IDRP Route Server alternative to a full mesh routing
*
* Ethereal - Network traffic analyzer
* By Gerald Combs <gerald@ethereal.com>
* 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
#include <stdio.h>
#include <stdlib.h>
-#ifdef HAVE_SYS_TYPES_H
-# include <sys/types.h>
-#endif
-
-#ifdef HAVE_NETINET_IN_H
-# include <netinet/in.h>
-#endif
-
-#ifdef HAVE_ARPA_INET_H
-#include <arpa/inet.h>
-#endif
-
#include <string.h>
#include <glib.h>
# include "snprintf.h"
#endif
-#include "packet.h"
+#include <epan/packet.h>
#include "packet-bgp.h"
#include "packet-ipv6.h"
+#include "afn.h"
+#include "prefs.h"
static const value_string bgptypevals[] = {
{ BGP_OPEN, "OPEN Message" },
{ BGP_NOTIFICATION, "NOTIFICATION Message" },
{ BGP_KEEPALIVE, "KEEPALIVE Message" },
{ BGP_ROUTE_REFRESH, "ROUTE-REFRESH Message" },
+ { BGP_CAPABILITY, "CAPABILITY Message" },
+ { BGP_ROUTE_REFRESH_CISCO, "Cisco ROUTE-REFRESH Message" },
{ 0, NULL },
};
{ 4, "Hold Timer Expired" },
{ 5, "Finite State Machine Error" },
{ 6, "Cease" },
+ { 7, "CAPABILITY Message Error" },
{ 0, NULL },
};
{ 0, NULL },
};
+static const value_string bgpnotify_minor_7[] = {
+ { 1, "Invalid Action Value" },
+ { 2, "Invalid Capability Length" },
+ { 3, "Malformed Capability Value" },
+ { 4, "Unsopported Capability Code" },
+ { 0, NULL },
+};
+
static const value_string *bgpnotify_minor[] = {
NULL, bgpnotify_minor_1, bgpnotify_minor_2, bgpnotify_minor_3,
};
{ BGPTYPE_CLUSTER_LIST, "CLUSTER_LIST" },
{ BGPTYPE_MP_REACH_NLRI, "MP_REACH_NLRI" },
{ BGPTYPE_MP_UNREACH_NLRI, "MP_UNREACH_NLRI" },
+ { BGPTYPE_EXTENDED_COMMUNITY, "EXTENDED_COMMUNITIES" },
+ { BGPTYPE_NEW_AS_PATH, "NEW_AS_PATH" },
+ { BGPTYPE_NEW_AGGREGATOR, "NEW_AGGREGATOR" },
+ { 0, NULL },
+};
+
+/* Beware : See also MAX_SIZE_OF_EXT_COM_NAMES */
+static const value_string bgpext_com_type[] = {
+ { BGP_EXT_COM_RT_0, "Route Target" },
+ { BGP_EXT_COM_RT_1, "Route Target" },
+ { BGP_EXT_COM_RO_0, "Route Origin" },
+ { BGP_EXT_COM_RO_1, "Route Origin" },
+ { BGP_EXT_COM_LINKBAND, "Link Bandwidth" },
+ { BGP_EXT_COM_VPN_ORIGIN, "OSPF Domain" },
+ { BGP_EXT_COM_OSPF_RTYPE, "OSPF Route Type" },
+ { BGP_EXT_COM_OSPF_RID, "OSPF Router ID" },
+ { BGP_EXT_COM_L2INFO, "Layer 2 Information" },
{ 0, NULL },
};
-/* Subsequent address family identifier, RFC2283 section 7 */
+static const value_string bgp_l2vpn_encaps[] = {
+ { 0, "Reserved"},
+ { 1, "Frame Relay"},
+ { 2, "ATM AAL5 VCC transport"},
+ { 3, "ATM transparent cell transport"},
+ { 4, "Ethernet VLAN"},
+ { 5, "Ethernet"},
+ { 6, "Cisco-HDLC"},
+ { 7, "PPP"},
+ { 8, "CEM"},
+ { 9, "ATM VCC cell transport"},
+ { 10, "ATM VPC cell transport"},
+ { 11, "MPLS"},
+ { 12, "VPLS"},
+ { 64, "IP-interworking"},
+ { 0, NULL},
+};
+
+static const value_string bgpext_ospf_rtype[] = {
+ { BGP_OSPF_RTYPE_RTR, "Router" },
+ { BGP_OSPF_RTYPE_NET, "Network" },
+ { BGP_OSPF_RTYPE_SUM, "Summary" },
+ { BGP_OSPF_RTYPE_EXT, "External" },
+ { BGP_OSPF_RTYPE_NSSA,"NSSA External" },
+ { BGP_OSPF_RTYPE_SHAM,"MPLS-VPN Sham" },
+ { 0, NULL },
+};
+
+
+/* MUST be resized if a longer named extended community is added */
+#define MAX_SIZE_OF_EXT_COM_NAMES 20
+
+/* Subsequent address family identifier, RFC2858 */
static const value_string bgpattr_nlri_safi[] = {
{ 0, "Reserved" },
- { 1, "Unicast" },
- { 2, "Multicast" },
- { 3, "Unicast+Multicast" },
+ { SAFNUM_UNICAST, "Unicast" },
+ { SAFNUM_MULCAST, "Multicast" },
+ { SAFNUM_UNIMULC, "Unicast+Multicast" },
+ { SAFNUM_MPLS_LABEL, "Labeled Unicast"},
+ { SAFNUM_LAB_VPNUNICAST, "Labeled VPN Unicast" }, /* draft-rosen-rfc2547bis-03 */
+ { SAFNUM_LAB_VPNMULCAST, "Labeled VPN Multicast" },
+ { SAFNUM_LAB_VPNUNIMULC, "Labeled VPN Unicast+Multicast" },
{ 0, NULL },
};
-static const value_string afnumber[] = {
- { 0, "Reserved" },
- { AFNUM_INET, "IPv4" },
- { AFNUM_INET6, "IPv6" },
- { AFNUM_NSAP, "NSAP" },
- { AFNUM_HDLC, "HDLC" },
- { AFNUM_BBN1822, "BBN 1822" },
- { AFNUM_802, "802" },
- { AFNUM_E163, "E.163" },
- { AFNUM_E164, "E.164" },
- { AFNUM_F69, "F.69" },
- { AFNUM_X121, "X.121" },
- { AFNUM_IPX, "IPX" },
- { AFNUM_ATALK, "Appletalk" },
- { AFNUM_DECNET, "Decnet IV" },
- { AFNUM_BANYAN, "Banyan Vines" },
- { AFNUM_E164NSAP, "E.164 with NSAP subaddress" },
- { 65535, "Reserved" },
+/* ORF Type, draft-ietf-idr-route-filter-04.txt */
+static const value_string orf_type_vals[] = {
+ { 2, "Communities ORF-Type" },
+ { 3, "Extended Communities ORF-Type" },
+ { 128, "Cisco PrefixList ORF-Type" },
+ { 129, "Cisco CommunityList ORF-Type" },
+ { 130, "Cisco Extended CommunityList ORF-Type" },
+ { 131, "Cisco AsPathList ORF-Type" },
+ { 0, NULL },
+};
+
+/* ORF Send/Receive, draft-ietf-idr-route-filter-04.txt */
+static const value_string orf_send_recv_vals[] = {
+ { 1, "Receive" },
+ { 2, "Send" },
+ { 3, "Both" },
+ { 0, NULL },
+};
+
+/* ORF Send/Receive, draft-ietf-idr-route-filter-04.txt */
+static const value_string orf_when_vals[] = {
+ { 1, "Immediate" },
+ { 2, "Defer" },
+ { 0, NULL },
+};
+
+static const value_string orf_entry_action_vals[] = {
+ { 0, "Add" },
+ { 0x40, "Remove" },
+ { 0x80, "RemoveAll" },
+ { 0, NULL },
+};
+
+static const value_string orf_entry_match_vals[] = {
+ { 0, "Permit" },
+ { 0x20, "Deny" },
+ { 0, NULL },
+};
+
+static const value_string capability_vals[] = {
+ { BGP_CAPABILITY_RESERVED, "Reserved capability" },
+ { BGP_CAPABILITY_MULTIPROTOCOL, "Multiprotocol extensions capability" },
+ { BGP_CAPABILITY_ROUTE_REFRESH, "Route refresh capability" },
+ { BGP_CAPABILITY_COOPERATIVE_ROUTE_FILTERING, "Cooperative route filtering capability" },
+ { BGP_CAPABILITY_GRACEFUL_RESTART, "Graceful Restart capability" },
+ { BGP_CAPABILITY_4_OCTET_AS_NUMBER, "Support for 4-octet AS number capability" },
+ { BGP_CAPABILITY_DYNAMIC_CAPABILITY, "Support for Dynamic capability" },
+ { BGP_CAPABILITY_ROUTE_REFRESH_CISCO, "Route refresh capability" },
+ { BGP_CAPABILITY_ORF_CISCO, "Cooperative route filtering capability" },
+};
+
+/* Capability Message action code */
+static const value_string bgpcap_action[] = {
+ { 0, "advertising a capability" },
+ { 1, "removing a capability" },
{ 0, NULL },
};
+
+/* Maximal size of an IP address string */
+#define MAX_SIZE_OF_IP_ADDR_STRING 16
+
static int proto_bgp = -1;
static int hf_bgp_type = -1;
static gint ett_bgp_attrs = -1;
static gint ett_bgp_attr = -1;
static gint ett_bgp_attr_flags = -1;
+static gint ett_bgp_mp_nhna = -1;
static gint ett_bgp_mp_reach_nlri = -1;
static gint ett_bgp_mp_unreach_nlri = -1;
+static gint ett_bgp_mp_snpa = -1;
static gint ett_bgp_nlri = -1;
static gint ett_bgp_open = -1;
static gint ett_bgp_update = -1;
static gint ett_bgp_notification = -1;
static gint ett_bgp_route_refresh = -1; /* ROUTE-REFRESH message tree */
+static gint ett_bgp_capability = -1;
static gint ett_bgp_as_paths = -1;
static gint ett_bgp_communities = -1;
static gint ett_bgp_cluster_list = -1; /* cluster list tree */
static gint ett_bgp_options = -1; /* optional parameters tree */
static gint ett_bgp_option = -1; /* an optional parameter tree */
+static gint ett_bgp_extended_communities = -1 ; /* extended communities list tree */
+static gint ett_bgp_orf = -1; /* orf (outbound route filter) tree */
+static gint ett_bgp_orf_entry = -1; /* orf entry tree */
+
+/* desegmentation */
+static gboolean bgp_desegment = TRUE;
+
+static gint bgp_asn_len = 0;
/*
* Decode an IPv4 prefix.
decode_prefix4(tvbuff_t *tvb, gint offset, char *buf, int buflen)
{
guint8 addr[4]; /* IP address */
- int plen; /* prefix length */
+ guint8 plen; /* prefix length */
int length; /* number of octets needed for prefix */
/* snarf length */
plen = tvb_get_guint8(tvb, offset);
- if (plen < 0 || 32 < plen)
+ if (plen > 32)
return -1;
length = (plen + 7) / 8;
addr[length - 1] &= ((0xff00 >> (plen % 8)) & 0xff);
/* hand back a formatted string */
- snprintf(buf, buflen, "%s/%d", ip_to_str(addr), plen);
+ snprintf(buf, buflen, "%s/%u", ip_to_str(addr), plen);
return(1 + length);
}
return(1 + length);
}
+
+
+/*
+ * Decode an MPLS label stack
+ */
+static int
+decode_MPLS_stack(tvbuff_t *tvb, gint offset, char *buf, size_t buflen)
+{
+ guint32 label_entry; /* an MPLS label enrty (label + COS field + stack bit */
+ gint index; /* index for the label stack */
+ char junk_buf[256]; /* tmp */
+
+ index = offset ;
+ label_entry = 0x000000 ;
+
+ buf[0] = '\0' ;
+
+ while ((label_entry & 0x000001) == 0) {
+
+ label_entry = tvb_get_ntoh24(tvb, index) ;
+
+ /* withdrawn routes may contain 0 or 0x800000 in the first label */
+ if((index-offset)==0&&(label_entry==0||label_entry==0x800000)) {
+ snprintf(buf, buflen, "0 (withdrawn)");
+ return (1);
+ }
+
+ snprintf(junk_buf, sizeof(junk_buf),"%u%s", (label_entry >> 4), ((label_entry & 0x000001) == 0) ? "," : " (bottom)");
+ if (strlen(buf) + strlen(junk_buf) + 1 <= buflen)
+ strcat(buf, junk_buf);
+ index += 3 ;
+
+ if ((label_entry & 0x000001) == 0) {
+ /* real MPLS multi-label stack in BGP? - maybe later; for now, it must be a bogus packet */
+ strcpy(junk_buf, " (BOGUS: Bottom of Stack NOT set!)");
+ if (strlen(buf) + strlen(junk_buf) + 1 <= buflen)
+ strcat(buf, junk_buf);
+ break;
+ }
+ }
+
+ return((index - offset) / 3);
+}
+
+/*
+ * Decode a multiprotocol address
+ */
+
+static int
+mp_addr_to_str (guint16 afi, guint8 safi, tvbuff_t *tvb, gint offset, char *buf, int buflen)
+{
+ int length; /* length of the address in byte */
+ guint8 ip4addr[4],ip4addr2[4]; /* IPv4 address */
+ guint16 rd_type; /* Route Distinguisher type */
+ struct e_in6_addr ip6addr; /* IPv6 address */
+
+ length = 0 ;
+ switch (afi) {
+ case AFNUM_INET:
+ switch (safi) {
+ case SAFNUM_UNICAST:
+ case SAFNUM_MULCAST:
+ case SAFNUM_UNIMULC:
+ case SAFNUM_MPLS_LABEL:
+ length = 4 ;
+ tvb_memcpy(tvb, ip4addr, offset, sizeof(ip4addr));
+ snprintf(buf, buflen, "%s", ip_to_str(ip4addr));
+ break;
+ case SAFNUM_LAB_VPNUNICAST:
+ case SAFNUM_LAB_VPNMULCAST:
+ case SAFNUM_LAB_VPNUNIMULC:
+ rd_type=tvb_get_ntohs(tvb,offset) ;
+ switch (rd_type) {
+ case FORMAT_AS2_LOC:
+ length = 8 + sizeof(ip4addr);
+ tvb_memcpy(tvb, ip4addr, offset + 8, sizeof(ip4addr)); /* Next Hop */
+ snprintf(buf, buflen, "Empty Label Stack RD=%u:%u IP=%s",
+ tvb_get_ntohs(tvb, offset + 2),
+ tvb_get_ntohl(tvb, offset + 4),
+ ip_to_str(ip4addr));
+ break;
+ case FORMAT_IP_LOC:
+ length = 8 + sizeof(ip4addr);
+ tvb_memcpy(tvb, ip4addr, offset + 2, sizeof(ip4addr)); /* IP part of the RD */
+ tvb_memcpy(tvb, ip4addr2, offset + 8, sizeof(ip4addr)); /* Next Hop */
+ snprintf(buf, buflen, "Empty Label Stack RD=%s:%u IP=%s",
+ ip_to_str(ip4addr),
+ tvb_get_ntohs(tvb, offset + 6),
+ ip_to_str(ip4addr2));
+ break ;
+ default:
+ length = 0 ;
+ snprintf(buf, buflen, "Unknown (0x%04x)labeled VPN address format",rd_type);
+ break;
+ }
+ break;
+ default:
+ length = 0 ;
+ snprintf(buf, buflen, "Unknown SAFI (%u) for AFI %u", safi, afi);
+ break;
+ }
+ break;
+ case AFNUM_INET6:
+ switch (safi) {
+ case SAFNUM_UNICAST:
+ case SAFNUM_MULCAST:
+ case SAFNUM_UNIMULC:
+ length = 16 ;
+ tvb_memcpy(tvb, ip6addr.u6_addr.u6_addr8,offset, 16);
+ snprintf(buf, buflen, "%s", ip6_to_str(&ip6addr));
+ break;
+ case SAFNUM_LAB_VPNUNICAST:
+ case SAFNUM_LAB_VPNMULCAST:
+ case SAFNUM_LAB_VPNUNIMULC:
+ rd_type=tvb_get_ntohs(tvb,offset) ;
+ switch (rd_type) {
+ case FORMAT_AS2_LOC:
+ length = 8 + 16;
+ tvb_memcpy(tvb, ip6addr.u6_addr.u6_addr8, offset + 8, 16); /* Next Hop */
+ snprintf(buf, buflen, "Empty Label Stack RD=%u:%u IP=%s",
+ tvb_get_ntohs(tvb, offset + 2),
+ tvb_get_ntohl(tvb, offset + 4),
+ ip6_to_str(&ip6addr));
+ break;
+ case FORMAT_IP_LOC:
+ length = 8 + 16;
+ tvb_memcpy(tvb, ip4addr, offset + 2, sizeof(ip4addr)); /* IP part of the RD */
+ tvb_memcpy(tvb, ip6addr.u6_addr.u6_addr8, offset + 8, 16); /* Next Hop */
+ snprintf(buf, buflen, "Empty Label Stack RD=%s:%u IP=%s",
+ ip_to_str(ip4addr),
+ tvb_get_ntohs(tvb, offset + 6),
+ ip6_to_str(&ip6addr));
+ break ;
+ default:
+ length = 0 ;
+ snprintf(buf, buflen, "Unknown (0x%04x)labeled VPN address format",rd_type);
+ break;
+ }
+ break;
+ default:
+ length = 0 ;
+ snprintf(buf, buflen, "Unknown SAFI (%u) for AFI %u", safi, afi);
+ break;
+ }
+ break;
+ case AFNUM_L2VPN:
+ switch (safi) {
+ case SAFNUM_LAB_VPNUNICAST: /* only labeles prefixes do make sense */
+ case SAFNUM_LAB_VPNMULCAST:
+ case SAFNUM_LAB_VPNUNIMULC:
+ length = 4; /* the next-hop is simply an ipv4 addr */
+ tvb_memcpy(tvb, ip4addr, offset + 0, 4);
+ snprintf(buf, buflen, "IP=%s",
+ ip_to_str(ip4addr));
+ break;
+ default:
+ length = 0 ;
+ snprintf(buf, buflen, "Unknown SAFI (%u) for AFI %u", safi, afi);
+ break;
+ }
+ break;
+ default:
+ length = 0 ;
+ snprintf(buf, buflen, "Unknown AFI (%u) value", afi);
+ break;
+ }
+ return(length) ;
+}
+
+/*
+ * Decode a multiprotocol prefix
+ */
+static int
+decode_prefix_MP(guint16 afi, guint8 safi, tvbuff_t *tvb, gint offset, char *buf, int buflen)
+{
+ int length; /* length of the prefix in byte */
+ guint8 plen; /* length of the prefix in bit */
+ int labnum; /* number of labels */
+ int ce_id,labblk_off;
+ guint8 ip4addr[4],ip4addr2[4]; /* IPv4 address */
+ struct e_in6_addr ip6addr; /* IPv6 address */
+ guint16 rd_type; /* Route Distinguisher type */
+ char lab_stk[256]; /* label stack */
+
+ length = 0 ;
+
+ switch (afi) {
+ case AFNUM_INET:
+ switch (safi) {
+ case SAFNUM_UNICAST:
+ case SAFNUM_MULCAST:
+ case SAFNUM_UNIMULC:
+ length = decode_prefix4(tvb, offset, buf, buflen) - 1 ;
+ break;
+ case SAFNUM_MPLS_LABEL:
+ plen = tvb_get_guint8(tvb,offset) ;
+ labnum = decode_MPLS_stack(tvb, offset + 1, lab_stk, sizeof(lab_stk));
+
+ offset += (1 + labnum * 3);
+ plen -= (labnum * 3*8);
+ if (plen > 32) {
+ length = 0 ;
+ break ;
+ }
+
+ length = (plen + 7) / 8;
+ memset(ip4addr, 0, sizeof(ip4addr));
+ tvb_memcpy(tvb, ip4addr, offset, length);
+ if (plen % 8)
+ ip4addr[length - 1] &= ((0xff00 >> (plen % 8)) & 0xff);
+
+ snprintf(buf,buflen, "Label Stack=%s IP=%s/%d",
+ lab_stk,
+ ip_to_str(ip4addr),
+ plen);
+ length += (labnum*3) ;
+ break;
+
+ case SAFNUM_LAB_VPNUNICAST:
+ case SAFNUM_LAB_VPNMULCAST:
+ case SAFNUM_LAB_VPNUNIMULC:
+ plen = tvb_get_guint8(tvb,offset) ;
+
+ labnum = decode_MPLS_stack(tvb, offset + 1, lab_stk, sizeof(lab_stk));
+
+ offset += (1 + labnum * 3);
+ plen -= (labnum * 3*8);
+
+ rd_type=tvb_get_ntohs(tvb,offset) ;
+ plen -= 8*8;
+
+ switch (rd_type) {
+ case FORMAT_AS2_LOC: /* Code borrowed from the decode_prefix4 function */
+ if (plen > 32) {
+ length = 0 ;
+ break ;
+ }
+
+ length = (plen + 7) / 8;
+ memset(ip4addr, 0, sizeof(ip4addr));
+ tvb_memcpy(tvb, ip4addr, offset + 8, length);
+ if (plen % 8)
+ ip4addr[length - 1] &= ((0xff00 >> (plen % 8)) & 0xff);
+
+ snprintf(buf,buflen, "Label Stack=%s RD=%u:%u, IP=%s/%d",
+ lab_stk,
+ tvb_get_ntohs(tvb, offset + 2),
+ tvb_get_ntohl(tvb, offset + 4),
+ ip_to_str(ip4addr),
+ plen);
+ length += (labnum * 3 + 8) ;
+ break ;
+ case FORMAT_IP_LOC: /* Code borrowed from the decode_prefix4 function */
+ tvb_memcpy(tvb, ip4addr, offset + 2, 4);
+
+ if (plen > 32) {
+ length = 0 ;
+ break ;
+ }
+
+ length = (plen + 7) / 8;
+ memset(ip4addr2, 0, sizeof(ip4addr2));
+ tvb_memcpy(tvb, ip4addr2, offset + 8, length);
+ if (plen % 8)
+ ip4addr2[length - 1] &= ((0xff00 >> (plen % 8)) & 0xff);
+
+ snprintf(buf,buflen, "Label Stack=%s RD=%s:%u, IP=%s/%d",
+ lab_stk,
+ ip_to_str(ip4addr),
+ tvb_get_ntohs(tvb, offset + 6),
+ ip_to_str(ip4addr2),
+ plen);
+ length += (labnum * 3 + 8) ;
+ break ;
+ default:
+ length = 0 ;
+ snprintf(buf,buflen, "Unknown labeled VPN address format");
+ break;
+ }
+ break;
+ default:
+ length = 0 ;
+ snprintf(buf,buflen, "Unknown SAFI (%u) for AFI %u", safi, afi);
+ break;
+ }
+ break;
+ case AFNUM_INET6:
+ switch (safi) {
+ case SAFNUM_UNICAST:
+ case SAFNUM_MULCAST:
+ case SAFNUM_UNIMULC:
+ length = decode_prefix6(tvb, offset, buf, buflen) - 1 ;
+ break;
+
+ case SAFNUM_LAB_VPNUNICAST:
+ case SAFNUM_LAB_VPNMULCAST:
+ case SAFNUM_LAB_VPNUNIMULC:
+ plen = tvb_get_guint8(tvb,offset) ;
+
+ labnum = decode_MPLS_stack(tvb, offset + 1, lab_stk, sizeof(lab_stk));
+
+ offset += (1 + labnum * 3);
+ plen -= (labnum * 3*8);
+
+ rd_type=tvb_get_ntohs(tvb,offset) ;
+ plen -= 8*8;
+
+ switch (rd_type) {
+ case FORMAT_AS2_LOC:
+ if (plen > 128) {
+ length = 0 ;
+ break ;
+ }
+
+ length = (plen + 7) / 8;
+ memset(ip6addr.u6_addr.u6_addr8, 0, 16);
+ tvb_memcpy(tvb, ip6addr.u6_addr.u6_addr8, offset + 8, length);
+ if (plen % 8)
+ ip6addr.u6_addr.u6_addr8[length - 1] &= ((0xff00 >> (plen % 8)) & 0xff);
+
+ snprintf(buf,buflen, "Label Stack=%s RD=%u:%u, IP=%s/%d",
+ lab_stk,
+ tvb_get_ntohs(tvb, offset + 2),
+ tvb_get_ntohl(tvb, offset + 4),
+ ip6_to_str(&ip6addr),
+ plen);
+ length += (labnum * 3 + 8) ;
+ break ;
+ case FORMAT_IP_LOC:
+ tvb_memcpy(tvb, ip4addr, offset + 2, sizeof(ip4addr));
+
+ if (plen > 128) {
+ length = 0 ;
+ break ;
+ }
+
+ length = (plen + 7) / 8;
+ memset(ip6addr.u6_addr.u6_addr8, 0, 16);
+ tvb_memcpy(tvb, ip6addr.u6_addr.u6_addr8, offset + 8, length);
+ if (plen % 8)
+ ip6addr.u6_addr.u6_addr8[length - 1] &= ((0xff00 >> (plen % 8)) & 0xff);
+
+ snprintf(buf,buflen, "Label Stack=%s RD=%s:%u, IP=%s/%d",
+ lab_stk,
+ ip_to_str(ip4addr),
+ tvb_get_ntohs(tvb, offset + 6),
+ ip6_to_str(&ip6addr),
+ plen);
+ length += (labnum * 3 + 8) ;
+ break ;
+ default:
+ length = 0 ;
+ snprintf(buf,buflen, "Unknown labeled VPN address format");
+ break;
+ }
+ break;
+
+
+ default:
+ length = 0 ;
+ snprintf(buf,buflen, "Unknown SAFI (%u) for AFI %u", safi, afi);
+ break;
+ }
+ break;
+ case AFNUM_L2VPN:
+ switch (safi) {
+ case SAFNUM_LAB_VPNUNICAST:
+ case SAFNUM_LAB_VPNMULCAST:
+ case SAFNUM_LAB_VPNUNIMULC:
+ plen = tvb_get_ntohs(tvb,offset);
+ rd_type=tvb_get_ntohs(tvb,offset+2);
+ ce_id=tvb_get_ntohs(tvb,offset+10);
+ labblk_off=tvb_get_ntohs(tvb,offset+12);
+ labnum = decode_MPLS_stack(tvb, offset + 14, lab_stk, sizeof(lab_stk));
+
+ switch (rd_type) {
+ case FORMAT_AS2_LOC:
+ tvb_memcpy(tvb, ip4addr, offset + 6, 4);
+ snprintf(buf,buflen, "RD: %u:%s, CE-ID: %u, Label-Block Offset: %u, Label Base %s",
+ tvb_get_ntohs(tvb, offset + 4),
+ ip_to_str(ip4addr),
+ ce_id,
+ labblk_off,
+ lab_stk);
+ break ;
+ case FORMAT_IP_LOC:
+ tvb_memcpy(tvb, ip4addr, offset + 4, 4);
+ snprintf(buf,buflen, "RD: %s:%u, CE-ID: %u, Label-Block Offset: %u, Label Base %s",
+ ip_to_str(ip4addr),
+ tvb_get_ntohs(tvb, offset + 8),
+ ce_id,
+ labblk_off,
+ lab_stk);
+ break ;
+ default:
+ length = 0 ;
+ snprintf(buf,buflen, "Unknown labeled VPN address format");
+ break;
+ }
+ /* FIXME there are subTLVs left to decode ... for now lets omit them */
+ length=plen+1; /* should be 2 but length+1 is returned at the end */
+ break;
+ default:
+ length = 0 ;
+ snprintf(buf, buflen, "Unknown SAFI (%u) for AFI %u", safi, afi);
+ break;
+ }
+ break;
+ default:
+ length = 0 ;
+ snprintf(buf,buflen, "Unknown AFI (%u) value", afi);
+ break;
+ }
+ return(1 + length) ;
+}
+
+/*
+ * Dissect a BGP capability.
+ */
+static void
+dissect_bgp_capability_item(tvbuff_t *tvb, int *p, proto_tree *tree, int ctype, int clen)
+{
+ proto_tree *subtree;
+ proto_item *ti;
+ guint8 orfnum; /* number of ORFs */
+ guint8 orftype; /* ORF Type */
+ guint8 orfsendrecv; /* ORF Send/Receive */
+ int tclen; /* capability length */
+ int i;
+
+ /* check the capability type */
+ switch (ctype) {
+ case BGP_CAPABILITY_RESERVED:
+ proto_tree_add_text(tree, tvb, *p - 2, 1,
+ "Capability code: %s (%d)", val_to_str(ctype,
+ capability_vals, "Unknown capability"), ctype);
+ proto_tree_add_text(tree, tvb, *p - 1,
+ 1, "Capability length: %u %s", clen,
+ (clen == 1) ? "byte" : "bytes");
+ if (clen != 0) {
+ proto_tree_add_text(tree, tvb, *p,
+ clen, "Capability value: Unknown");
+ }
+ *p += clen;
+ break;
+ case BGP_CAPABILITY_MULTIPROTOCOL:
+ proto_tree_add_text(tree, tvb, *p - 2, 1,
+ "Capability code: %s (%d)", val_to_str(ctype,
+ capability_vals, "Unknown capability"), ctype);
+ if (clen != 4) {
+ proto_tree_add_text(tree, tvb, *p - 1,
+ 1, "Capability length: Invalid");
+ proto_tree_add_text(tree, tvb, *p,
+ clen, "Capability value: Unknown");
+ }
+ else {
+ proto_tree_add_text(tree, tvb, *p - 1,
+ 1, "Capability length: %u %s", clen,
+ (clen == 1) ? "byte" : "bytes");
+ ti = proto_tree_add_text(tree, tvb, *p, clen, "Capability value");
+ subtree = proto_item_add_subtree(ti, ett_bgp_option);
+ /* AFI */
+ i = tvb_get_ntohs(tvb, *p);
+ proto_tree_add_text(subtree, tvb, *p,
+ 2, "Address family identifier: %s (%u)",
+ val_to_str(i, afn_vals, "Unknown"), i);
+ *p += 2;
+ /* Reserved */
+ proto_tree_add_text(subtree, tvb, *p, 1, "Reserved: 1 byte");
+ (*p)++;
+ /* SAFI */
+ i = tvb_get_guint8(tvb, *p);
+ proto_tree_add_text(subtree, tvb, *p,
+ 1, "Subsequent address family identifier: %s (%u)",
+ val_to_str(i, bgpattr_nlri_safi,
+ i >= 128 ? "Vendor specific" : "Unknown"), i);
+ (*p)++;
+ }
+ break;
+ case BGP_CAPABILITY_GRACEFUL_RESTART:
+ proto_tree_add_text(tree, tvb, *p - 2, 1,
+ "Capability code: %s (%d)", val_to_str(ctype,
+ capability_vals, "Unknown capability"), ctype);
+ if (clen < 6) {
+ proto_tree_add_text(tree, tvb, *p,
+ clen, "Capability value: Invalid");
+ }
+ else {
+ proto_tree_add_text(tree, tvb, *p - 1,
+ 1, "Capability length: %u %s", clen,
+ (clen == 1) ? "byte" : "bytes");
+ ti = proto_tree_add_text(tree, tvb, *p, clen, "Capability value");
+ subtree = proto_item_add_subtree(ti, ett_bgp_option);
+ /* Timers */
+ i = tvb_get_ntohs(tvb, *p);
+ proto_tree_add_text(subtree, tvb, *p,
+ 2, "Restart Flags: [%s], Restart Time %us",
+ (i&0x8000) ? "R" : "none", i&0xfff);
+ *p += 2;
+ tclen = clen - 2;
+ /*
+ * what follows is alist of AFI/SAFI/flag triplets
+ * read it until the TLV ends
+ */
+ while (tclen >=4) {
+ /* AFI */
+ i = tvb_get_ntohs(tvb, *p);
+ proto_tree_add_text(subtree, tvb, *p,
+ 2, "Address family identifier: %s (%u)",
+ val_to_str(i, afn_vals, "Unknown"), i);
+ *p += 2;
+ /* SAFI */
+ i = tvb_get_guint8(tvb, *p);
+ proto_tree_add_text(subtree, tvb, *p,
+ 1, "Subsequent address family identifier: %s (%u)",
+ val_to_str(i, bgpattr_nlri_safi,
+ i >= 128 ? "Vendor specific" : "Unknown"), i);
+ (*p)++;
+ /* flags */
+ i = tvb_get_guint8(tvb, *p);
+ proto_tree_add_text(subtree, tvb, *p, 1,
+ "Preserve forwarding state: %s",
+ (i&0x80) ? "yes" : "no");
+ (*p)++;
+ tclen-=4;
+ }
+ }
+ *p += clen;
+ break;
+ case BGP_CAPABILITY_4_OCTET_AS_NUMBER:
+ proto_tree_add_text(tree, tvb, *p - 2, 1,
+ "Capability code: %s (%d)", val_to_str(ctype,
+ capability_vals, "Unknown capability"), ctype);
+ if (clen != 4) {
+ proto_tree_add_text(tree, tvb, *p,
+ clen, "Capability value: Invalid");
+ }
+ else {
+ proto_tree_add_text(tree, tvb, *p - 1,
+ 1, "Capability length: %u %s", clen,
+ (clen == 1) ? "byte" : "bytes");
+ ti = proto_tree_add_text(tree, tvb, *p, clen, "Capability value");
+ subtree = proto_item_add_subtree(ti, ett_bgp_option);
+ proto_tree_add_text(subtree, tvb, *p, 4,
+ "AS number: %d", tvb_get_ntohl(tvb, *p));
+ }
+ *p += clen;
+ break;
+ case BGP_CAPABILITY_DYNAMIC_CAPABILITY:
+ proto_tree_add_text(tree, tvb, *p - 2, 1,
+ "Capability code: %s (%d)", val_to_str(ctype,
+ capability_vals, "Unknown capability"), ctype);
+ proto_tree_add_text(tree, tvb, *p - 1, 1,
+ "Capability length: %u %s", clen,
+ (clen == 1) ? "byte" : "bytes");
+ if (clen > 0) {
+ ti = proto_tree_add_text(tree, tvb, *p, clen, "Capability value");
+ subtree = proto_item_add_subtree(ti, ett_bgp_option);
+ for (i = 0; (int)i <= clen; i++) {
+ proto_tree_add_text(subtree, tvb, *p, 1,
+ "Capability code: %s (%d)", val_to_str(ctype,
+ capability_vals, "Unknown capability"),
+ tvb_get_guint8(tvb, *p));
+ (*p)++;
+ }
+ }
+ break;
+ case BGP_CAPABILITY_ROUTE_REFRESH_CISCO:
+ case BGP_CAPABILITY_ROUTE_REFRESH:
+ proto_tree_add_text(tree, tvb, *p - 2, 1,
+ "Capability code: %s (%d)", val_to_str(ctype,
+ capability_vals, "Unknown capability"), ctype);
+ if (clen != 0) {
+ proto_tree_add_text(tree, tvb, *p,
+ clen, "Capability value: Invalid");
+ }
+ else {
+ proto_tree_add_text(tree, tvb, *p - 1,
+ 1, "Capability length: %u %s", clen,
+ (clen == 1) ? "byte" : "bytes");
+ }
+ *p += clen;
+ break;
+ case BGP_CAPABILITY_ORF_CISCO:
+ case BGP_CAPABILITY_COOPERATIVE_ROUTE_FILTERING:
+ proto_tree_add_text(tree, tvb, *p - 2, 1,
+ "Capability code: %s (%d)", val_to_str(ctype,
+ capability_vals, "Unknown capability"), ctype);
+ proto_tree_add_text(tree, tvb, *p - 1,
+ 1, "Capability length: %u %s", clen,
+ (clen == 1) ? "byte" : "bytes");
+ ti = proto_tree_add_text(tree, tvb, *p, clen, "Capability value");
+ subtree = proto_item_add_subtree(ti, ett_bgp_option);
+ /* AFI */
+ i = tvb_get_ntohs(tvb, *p);
+ proto_tree_add_text(subtree, tvb, *p,
+ 2, "Address family identifier: %s (%u)",
+ val_to_str(i, afn_vals, "Unknown"), i);
+ *p += 2;
+ /* Reserved */
+ proto_tree_add_text(subtree, tvb, *p, 1, "Reserved: 1 byte");
+ (*p)++;
+ /* SAFI */
+ i = tvb_get_guint8(tvb, *p);
+ proto_tree_add_text(subtree, tvb, *p,
+ 1, "Subsequent address family identifier: %s (%u)",
+ val_to_str(i, bgpattr_nlri_safi,
+ i >= 128 ? "Vendor specific" : "Unknown"), i);
+ (*p)++;
+ /* Number of ORFs */
+ orfnum = tvb_get_guint8(tvb, *p);
+ proto_tree_add_text(subtree, tvb, *p, 1, "Number of ORFs: %u", orfnum);
+ (*p)++;
+ for (i=0; i<orfnum; i++) {
+ /* ORF Type */
+ orftype = tvb_get_guint8(tvb, *p);
+ proto_tree_add_text(subtree, tvb, *p, 1, "ORF Type: %s (%u)",
+ val_to_str(orftype, orf_type_vals,"Unknown"), orftype);
+ (*p)++;
+ /* Send/Receive */
+ orfsendrecv = tvb_get_guint8(tvb, *p);
+ proto_tree_add_text(subtree, tvb, *p,
+ 1, "Send/Receive: %s (%u)",
+ val_to_str(orfsendrecv, orf_send_recv_vals,
+ "Uknown"), orfsendrecv);
+ (*p)++;
+ }
+ break;
+ /* unknown capability */
+ default:
+ proto_tree_add_text(tree, tvb, *p - 2, 1,
+ "Capability code: %s (%d)", val_to_str(ctype,
+ capability_vals, "Unknown capability"), ctype);
+ proto_tree_add_text(tree, tvb, *p - 2,
+ 1, "Capability code: %s (%d)",
+ ctype >= 128 ? "Private use" : "Unknown", ctype);
+ proto_tree_add_text(tree, tvb, *p - 1,
+ 1, "Capability length: %u %s", clen,
+ (clen == 1) ? "byte" : "bytes");
+ if (clen != 0) {
+ proto_tree_add_text(tree, tvb, *p,
+ clen, "Capability value: Unknown");
+ }
+ *p += clen;
+ break;
+ }
+}
+
+
/*
* Dissect a BGP OPEN message.
*/
+static const value_string community_vals[] = {
+ { BGP_COMM_NO_EXPORT, "NO_EXPORT" },
+ { BGP_COMM_NO_ADVERTISE, "NO_ADVERTISE" },
+ { BGP_COMM_NO_EXPORT_SUBCONFED, "NO_EXPORT_SUBCONFED" },
+ { 0, NULL }
+};
+
static void
dissect_bgp_open(tvbuff_t *tvb, int offset, proto_tree *tree)
{
struct bgp_open bgpo; /* BGP OPEN message */
int hlen; /* message length */
- u_int i; /* tmp */
int ptype; /* parameter type */
int plen; /* parameter length */
int ctype; /* capability type */
int clen; /* capability length */
+ int cend; /* capabilities end */
int ostart; /* options start */
int oend; /* options end */
int p; /* tvb offset counter */
proto_item *ti; /* tree item */
proto_tree *subtree; /* subtree for options */
+ proto_tree *subtree1; /* subtree for an option */
proto_tree *subtree2; /* subtree for an option */
- proto_tree *subtree3; /* subtree for an option */
/* snarf OPEN message */
tvb_memcpy(tvb, bgpo.bgpo_marker, offset, BGP_MIN_OPEN_MSG_SIZE);
- hlen = ntohs(bgpo.bgpo_len);
+ hlen = g_ntohs(bgpo.bgpo_len);
proto_tree_add_text(tree, tvb,
offset + offsetof(struct bgp_open, bgpo_version), 1,
"Version: %u", bgpo.bgpo_version);
proto_tree_add_text(tree, tvb,
offset + offsetof(struct bgp_open, bgpo_myas), 2,
- "My AS: %u", ntohs(bgpo.bgpo_myas));
+ "My AS: %u", g_ntohs(bgpo.bgpo_myas));
proto_tree_add_text(tree, tvb,
offset + offsetof(struct bgp_open, bgpo_holdtime), 2,
- "Hold time: %u", ntohs(bgpo.bgpo_holdtime));
+ "Hold time: %u", g_ntohs(bgpo.bgpo_holdtime));
proto_tree_add_text(tree, tvb,
offset + offsetof(struct bgp_open, bgpo_id), 4,
"BGP identifier: %s", ip_to_str((guint8 *)&bgpo.bgpo_id));
if (bgpo.bgpo_optlen > 0) {
/* add a subtree and setup some offsets */
ostart = offset + BGP_MIN_OPEN_MSG_SIZE;
- ti = proto_tree_add_text(tree, tvb, ostart, bgpo.bgpo_optlen,
+ ti = proto_tree_add_text(tree, tvb, ostart, bgpo.bgpo_optlen,
"Optional parameters");
subtree = proto_item_add_subtree(ti, ett_bgp_options);
p = offset + ostart;
/* grab the type and length */
ptype = tvb_get_guint8(tvb, p++);
plen = tvb_get_guint8(tvb, p++);
-
- /* check the type */
+
+ /* check the type */
switch (ptype) {
case BGP_OPTION_AUTHENTICATION:
proto_tree_add_text(subtree, tvb, p - 2, 2 + plen,
break;
case BGP_OPTION_CAPABILITY:
/* grab the capability code */
+ cend = p - 1 + plen;
ctype = tvb_get_guint8(tvb, p++);
clen = tvb_get_guint8(tvb, p++);
-
- /* check the capability type */
- switch (ctype) {
- case BGP_CAPABILITY_RESERVED:
- ti = proto_tree_add_text(subtree, tvb, p - 4,
- 2 + plen, "Reserved capability (%u %s)", 2 + plen,
- (plen == 1) ? "byte" : "bytes");
- subtree2 = proto_item_add_subtree(ti, ett_bgp_option);
- proto_tree_add_text(subtree2, tvb, p - 4,
- 1, "Parameter type: Capabilities (2)");
- proto_tree_add_text(subtree2, tvb, p - 3,
- 1, "Parameter length: %u %s", plen,
- (plen == 1) ? "byte" : "bytes");
- proto_tree_add_text(subtree2, tvb, p - 2,
- 1, "Capability code: Reserved (0)");
- proto_tree_add_text(subtree2, tvb, p - 1,
- 1, "Capability length: %u %s", clen,
- (clen == 1) ? "byte" : "bytes");
- if (clen != 0) {
- proto_tree_add_text(subtree2, tvb, p,
- clen, "Capability value: Unknown");
- }
- p += clen;
- break;
- case BGP_CAPABILITY_MULTIPROTOCOL:
- ti = proto_tree_add_text(subtree, tvb, p - 4,
- 2 + plen,
- "Multiprotocol extensions capability (%u %s)",
- 2 + plen, (plen == 1) ? "byte" : "bytes");
- subtree2 = proto_item_add_subtree(ti, ett_bgp_option);
- proto_tree_add_text(subtree2, tvb, p - 4,
- 1, "Parameter type: Capabilities (2)");
- proto_tree_add_text(subtree2, tvb, p - 3,
- 1, "Parameter length: %u %s", plen,
- (plen == 1) ? "byte" : "bytes");
- proto_tree_add_text(subtree2, tvb, p - 2,
- 1, "Capability code: Multiprotocol extensions (%d)",
- ctype);
- if (clen != 4) {
- proto_tree_add_text(subtree2, tvb, p - 1,
- 1, "Capability length: Invalid");
- proto_tree_add_text(subtree2, tvb, p,
- clen, "Capability value: Unknown");
- }
- else {
- proto_tree_add_text(subtree2, tvb, p - 1,
- 1, "Capability length: %u %s", clen,
- (clen == 1) ? "byte" : "bytes");
- ti = proto_tree_add_text(subtree2, tvb, p,
- clen, "Capability value");
- subtree3 = proto_item_add_subtree(ti,
- ett_bgp_option);
- /* AFI */
- i = tvb_get_ntohs(tvb, p);
- proto_tree_add_text(subtree3, tvb, p,
- 2, "Address family identifier: %s (%u)",
- val_to_str(i, afnumber, "Unknown"), i);
- p += 2;
- /* Reserved */
- proto_tree_add_text(subtree3, tvb, p,
- 1, "Reserved: 1 byte");
- p++;
- /* SAFI */
- i = tvb_get_guint8(tvb, p);
- proto_tree_add_text(subtree3, tvb, p,
- 1, "Subsequent address family identifier: %s (%u)",
- val_to_str(i, bgpattr_nlri_safi,
- i >= 128 ? "Vendor specific" : "Unknown"), i);
- p++;
- }
- break;
- case BGP_CAPABILITY_ROUTE_REFRESH:
- ti = proto_tree_add_text(subtree, tvb, p - 4,
- 2 + plen, "Route refresh capability (%u %s)", 2 + plen,
- (plen == 1) ? "byte" : "bytes");
- subtree2 = proto_item_add_subtree(ti, ett_bgp_option);
- proto_tree_add_text(subtree2, tvb, p - 4,
- 1, "Parameter type: Capabilities (2)");
- proto_tree_add_text(subtree2, tvb, p - 3,
- 1, "Parameter length: %u %s", plen,
- (plen == 1) ? "byte" : "bytes");
- proto_tree_add_text(subtree2, tvb, p - 2,
- 1, "Capability code: Route refresh (%d)", ctype);
- if (clen != 0) {
- proto_tree_add_text(subtree2, tvb, p,
- clen, "Capability value: Invalid");
- }
- else {
- proto_tree_add_text(subtree2, tvb, p - 1,
- 1, "Capability length: %u %s", clen,
- (clen == 1) ? "byte" : "bytes");
- }
- p += clen;
- break;
- /* unknown capability */
- default:
- ti = proto_tree_add_text(subtree, tvb, p - 4,
- 2 + plen, "Unknown capability (%u %s)", 2 + plen,
- (plen == 1) ? "byte" : "bytes");
- subtree2 = proto_item_add_subtree(ti, ett_bgp_option);
- proto_tree_add_text(subtree2, tvb, p - 4,
- 1, "Parameter type: Capabilities (2)");
- proto_tree_add_text(subtree2, tvb, p - 3,
- 1, "Parameter length: %u %s", plen,
- (plen == 1) ? "byte" : "bytes");
- proto_tree_add_text(subtree2, tvb, p - 2,
- 1, "Capability code: %s (%d)",
- ctype >= 128 ? "Private use" : "Unknown", ctype);
- proto_tree_add_text(subtree2, tvb, p - 1,
- 1, "Capability length: %u %s", clen,
- (clen == 1) ? "byte" : "bytes");
- if (clen != 0) {
- proto_tree_add_text(subtree2, tvb, p,
- clen, "Capability value: Unknown");
- }
- p += clen;
- break;
- }
+ ti = proto_tree_add_text(subtree, tvb, p - 4,
+ 2 + plen, "Capabilities Advertisement (%u bytes)",
+ 2 + plen);
+ subtree1 = proto_item_add_subtree(ti, ett_bgp_option);
+ proto_tree_add_text(subtree1, tvb, p - 4,
+ 1, "Parameter type: Capabilities (2)");
+ proto_tree_add_text(subtree1, tvb, p - 3,
+ 1, "Parameter length: %u %s", plen,
+ (plen == 1) ? "byte" : "bytes");
+ p -= 2;
+
+ /* step through all of the capabilities */
+ while (p < cend) {
+ ctype = tvb_get_guint8(tvb, p++);
+ clen = tvb_get_guint8(tvb, p++);
+
+ ti = proto_tree_add_text(subtree1, tvb, p - 2,
+ 2 + clen, "%s (%u %s)", val_to_str(ctype,
+ capability_vals, "Unknown capability"),
+ 2 + clen, (clen == 1) ? "byte" : "bytes");
+ subtree2 = proto_item_add_subtree(ti, ett_bgp_option);
+ dissect_bgp_capability_item(tvb, &p,
+ subtree2, ctype, clen);
+ }
break;
default:
proto_tree_add_text(subtree, tvb, p - 2, 2 + plen,
*/
static void
dissect_bgp_update(tvbuff_t *tvb, int offset, proto_tree *tree)
- {
+{
struct bgp_attr bgpa; /* path attributes */
- int hlen; /* message length */
+ guint16 hlen; /* message length */
gint o; /* packet offset */
gint q; /* tmp */
gint end; /* message end */
- int len; /* tmp */
+ guint16 ext_com; /* EXTENDED COMMUNITY type */
+ guint16 len; /* tmp */
+ int advance; /* tmp */
proto_item *ti; /* tree item */
- proto_tree *subtree; /* subtree for attibutes */
- proto_tree *subtree2; /* subtree for attibutes */
- proto_tree *subtree3; /* subtree for attibutes */
+ proto_tree *subtree; /* subtree for attributes */
+ proto_tree *subtree2; /* subtree for attributes */
+ proto_tree *subtree3; /* subtree for attributes */
+ proto_tree *subtree4; /* subtree for attributes */
proto_tree *as_paths_tree; /* subtree for AS_PATHs */
proto_tree *as_path_tree; /* subtree for AS_PATH */
proto_tree *communities_tree; /* subtree for COMMUNITIES */
char *communities_str = NULL; /* COMMUNITIES string */
char *cluster_list_str = NULL; /* CLUSTER_LIST string */
char junk_buf[256]; /* tmp */
+ int junk_buf_len; /* tmp len */
guint8 ipaddr[4]; /* IPv4 address */
- struct e_in6_addr ip6addr; /* IPv6 address */
hlen = tvb_get_ntohs(tvb, offset + BGP_MARKER_SIZE);
o = offset + BGP_HEADER_SIZE;
/* check for withdrawals */
len = tvb_get_ntohs(tvb, o);
- proto_tree_add_text(tree, tvb, o, 2,
+ proto_tree_add_text(tree, tvb, o, 2,
"Unfeasible routes length: %u %s", len, (len == 1) ? "byte" : "bytes");
o += 2;
end = o + len;
while (o < end) {
i = decode_prefix4(tvb, o, junk_buf, sizeof(junk_buf));
+ if (i < 0 || 32 < i) {
+ proto_tree_add_text (tree, tvb, o, len,
+ "Invalid withdrawn route prefix length: %u",
+ tvb_get_guint8(tvb, o) );
+ return;
+ }
+
proto_tree_add_text(subtree, tvb, o, i, "%s", junk_buf);
o += i;
}
}
- else {
- o += len;
- }
/* check for advertisements */
len = tvb_get_ntohs(tvb, o);
- proto_tree_add_text(tree, tvb, o, 2, "Total path attribute length: %u %s",
+ proto_tree_add_text(tree, tvb, o, 2, "Total path attribute length: %u %s",
len, (len == 1) ? "byte" : "bytes");
/* path attributes */
subtree = proto_item_add_subtree(ti, ett_bgp_attrs);
i = 2;
while (i < len) {
- int alen, aoff;
- char *msg;
+ char *msg;
+ int off;
+ gint k;
+ guint16 alen, tlen, aoff;
guint16 af;
- int off, snpa;
+ guint8 saf, snpa;
+ guint8 nexthop_len;
+ guint8 asn_len = 0;
tvb_memcpy(tvb, (guint8 *)&bgpa, o + i, sizeof(bgpa));
/* check for the Extended Length bit */
alen = tvb_get_guint8(tvb, o + i + sizeof(bgpa));
aoff = sizeof(bgpa) + 1;
}
+ tlen = alen;
- /* This is kind of ugly - similar code appears twice, but it
+ /* This is kind of ugly - similar code appears twice, but it
helps browsing attrs. */
/* the first switch prints things in the title of the subtree */
switch (bgpa.bgpa_type) {
case BGPTYPE_ORIGIN:
- if (alen != 1)
+ if (tlen != 1)
goto default_attribute_top;
msg = val_to_str(tvb_get_guint8(tvb, o + i + aoff), bgpattr_origin, "Unknown");
- ti = proto_tree_add_text(subtree, tvb, o + i, alen + aoff,
+ ti = proto_tree_add_text(subtree, tvb, o + i, tlen + aoff,
"%s: %s (%u %s)",
val_to_str(bgpa.bgpa_type, bgpattr_type, "Unknown"),
- msg, alen + aoff, (alen + aoff == 1) ? "byte" :
+ msg, tlen + aoff, (tlen + aoff == 1) ? "byte" :
"bytes");
break;
case BGPTYPE_AS_PATH:
- /* (o + i + 3) =
- (o + current attribute + 3 bytes to first tuple) */
- end = o + alen + i + 3;
- q = o + i + 3;
+ case BGPTYPE_NEW_AS_PATH:
+ /* (o + i + aoff) =
+ (o + current attribute + aoff bytes to first tuple) */
+ q = o + i + aoff;
+ end = q + tlen;
/* must be freed by second switch! */
- /* "alen * 6" (5 digits + space) should be a good estimate
+ /* "tlen * 11" (10 digits + space) should be a good estimate
of how long the AS path string could be */
- as_path_str = malloc((alen + 1) * 6);
+ as_path_str = malloc((tlen + 1) * 11);
if (as_path_str == NULL) break;
as_path_str[0] = '\0';
-
+
+ /* estimate the length of the AS number */
+ if (bgpa.bgpa_type == BGPTYPE_NEW_AS_PATH)
+ asn_len = 4;
+ else {
+ if (bgp_asn_len == 0) {
+ k = q;
+ while (k < end) {
+ k++;
+ length = tvb_get_guint8(tvb, k++);
+ k += length * 2;
+ }
+ asn_len = (k == end) ? 2 : 4;
+ }
+ else {
+ asn_len = bgp_asn_len;
+ }
+ }
+
/* snarf each AS path */
while (q < end) {
- type = tvb_get_guint8(tvb, q++);
+ type = tvb_get_guint8(tvb, q++);
+ if (strlen(as_path_str) != 0 &&
+ as_path_str[strlen(as_path_str) - 1] != ' ')
+ strcat(as_path_str, " ");
if (type == AS_SET) {
- snprintf(as_path_str, 2, "{");
+ strcat(as_path_str, "{");
}
else if (type == AS_CONFED_SET) {
- snprintf(as_path_str, 2, "[");
+ strcat(as_path_str, "[");
}
else if (type == AS_CONFED_SEQUENCE) {
- snprintf(as_path_str, 2, "(");
- }
- length = tvb_get_guint8(tvb, q++);
+ strcat(as_path_str, "(");
+ }
+ length = tvb_get_guint8(tvb, q++);
/* snarf each value in path */
for (j = 0; j < length; j++) {
- snprintf(junk_buf, sizeof(junk_buf), "%u%s", tvb_get_ntohs(tvb, q),
- (type == AS_SET || type == AS_CONFED_SET)
- ? ", " : " ");
+ snprintf(junk_buf, sizeof(junk_buf), "%u%s",
+ (asn_len == 2) ?
+ tvb_get_ntohs(tvb, q) : tvb_get_ntohl(tvb, q),
+ (type == AS_SET || type == AS_CONFED_SET) ?
+ ", " : " ");
strncat(as_path_str, junk_buf, sizeof(junk_buf));
- q += 2;
+ q += asn_len;
}
-
+
/* cleanup end of string */
if (type == AS_SET) {
- as_path_str[strlen(as_path_str) - 2] = '}';
+ as_path_str[strlen(as_path_str) - 2] = '}';
+ as_path_str[strlen(as_path_str) - 1] = '\0';
}
else if (type == AS_CONFED_SET) {
- as_path_str[strlen(as_path_str) - 2] = ']';
+ as_path_str[strlen(as_path_str) - 2] = ']';
+ as_path_str[strlen(as_path_str) - 1] = '\0';
}
else if (type == AS_CONFED_SEQUENCE) {
as_path_str[strlen(as_path_str) - 1] = ')';
}
/* check for empty AS_PATH */
- if (alen == 0)
+ if (tlen == 0)
strncpy(as_path_str, "empty", 6);
- ti = proto_tree_add_text(subtree, tvb, o + i, alen + aoff,
+ ti = proto_tree_add_text(subtree, tvb, o + i, tlen + aoff,
"%s: %s (%u %s)",
val_to_str(bgpa.bgpa_type, bgpattr_type, "Unknown"),
- as_path_str, alen + aoff,
- (alen + aoff == 1) ? "byte" : "bytes");
+ as_path_str, tlen + aoff,
+ (tlen + aoff == 1) ? "byte" : "bytes");
break;
case BGPTYPE_NEXT_HOP:
- if (alen != 4)
+ if (tlen != 4)
goto default_attribute_top;
tvb_memcpy(tvb, ipaddr, o + i + aoff, 4);
- ti = proto_tree_add_text(subtree, tvb, o + i, alen + aoff,
+ ti = proto_tree_add_text(subtree, tvb, o + i, tlen + aoff,
"%s: %s (%u %s)",
val_to_str(bgpa.bgpa_type, bgpattr_type, "Unknown"),
- ip_to_str(ipaddr), alen + aoff, (alen + aoff == 1)
+ ip_to_str(ipaddr), tlen + aoff, (tlen + aoff == 1)
? "byte" : "bytes");
break;
case BGPTYPE_MULTI_EXIT_DISC:
- if (alen != 4)
+ if (tlen != 4)
goto default_attribute_top;
- ti = proto_tree_add_text(subtree, tvb, o + i, alen + aoff,
+ ti = proto_tree_add_text(subtree, tvb, o + i, tlen + aoff,
"%s: %u (%u %s)",
val_to_str(bgpa.bgpa_type, bgpattr_type, "Unknown"),
- tvb_get_ntohl(tvb, o + i + aoff), alen + aoff,
- (alen + aoff == 1) ? "byte" : "bytes");
+ tvb_get_ntohl(tvb, o + i + aoff), tlen + aoff,
+ (tlen + aoff == 1) ? "byte" : "bytes");
break;
case BGPTYPE_LOCAL_PREF:
- if (alen != 4)
+ if (tlen != 4)
goto default_attribute_top;
- ti = proto_tree_add_text(subtree, tvb, o + i, alen + aoff,
+ ti = proto_tree_add_text(subtree, tvb, o + i, tlen + aoff,
"%s: %u (%u %s)",
val_to_str(bgpa.bgpa_type, bgpattr_type, "Unknown"),
- tvb_get_ntohl(tvb, o + i + aoff), alen + aoff,
- (alen + aoff == 1) ? "byte" : "bytes");
+ tvb_get_ntohl(tvb, o + i + aoff), tlen + aoff,
+ (tlen + aoff == 1) ? "byte" : "bytes");
break;
case BGPTYPE_ATOMIC_AGGREGATE:
- if (alen != 0)
+ if (tlen != 0)
goto default_attribute_top;
- ti = proto_tree_add_text(subtree, tvb, o + i, alen + aoff,
+ ti = proto_tree_add_text(subtree, tvb, o + i, tlen + aoff,
"%s (%u %s)",
val_to_str(bgpa.bgpa_type, bgpattr_type, "Unknown"),
- alen + aoff, (alen + aoff == 1) ? "byte" : "bytes");
+ tlen + aoff, (tlen + aoff == 1) ? "byte" : "bytes");
break;
case BGPTYPE_AGGREGATOR:
- if (alen != 6)
+ if (tlen != 6 && tlen != 8)
+ goto default_attribute_top;
+ case BGPTYPE_NEW_AGGREGATOR:
+ if (bgpa.bgpa_type == BGPTYPE_NEW_AGGREGATOR && tlen != 8)
goto default_attribute_top;
- tvb_memcpy(tvb, ipaddr, o + i + aoff + 2, 4);
- ti = proto_tree_add_text(subtree, tvb, o + i, alen + aoff,
+ asn_len = tlen - 4;
+ tvb_memcpy(tvb, ipaddr, o + i + aoff + asn_len, 4);
+ ti = proto_tree_add_text(subtree, tvb, o + i, tlen + aoff,
"%s: AS: %u origin: %s (%u %s)",
val_to_str(bgpa.bgpa_type, bgpattr_type, "Unknown"),
- tvb_get_ntohs(tvb, o + i + aoff),
- ip_to_str(ipaddr), alen + aoff,
- (alen + aoff == 1) ? "byte" : "bytes");
+ (asn_len == 2) ? tvb_get_ntohs(tvb, o + i + aoff) :
+ tvb_get_ntohl(tvb, o + i + aoff),
+ ip_to_str(ipaddr), tlen + aoff,
+ (tlen + aoff == 1) ? "byte" : "bytes");
break;
case BGPTYPE_COMMUNITIES:
- if (alen % 4 != 0)
+ if (tlen % 4 != 0)
goto default_attribute_top;
- /* (o + i + 3) =
- (o + current attribute + 3 bytes to first tuple) */
- end = o + alen + i + 3;
- q = o + i + 3;
+ /* (o + i + aoff) =
+ (o + current attribute + aoff bytes to first tuple) */
+ q = o + i + aoff;
+ end = q + tlen;
/* must be freed by second switch! */
- /* "alen * 12" (5 digits, a :, 5 digits + space ) should be
- a good estimate of how long the communities string could
+ /* "tlen * 12" (5 digits, a :, 5 digits + space ) should be
+ a good estimate of how long the communities string could
be */
- communities_str = malloc((alen + 1) * 12);
+ communities_str = malloc((tlen + 1) * 12);
if (communities_str == NULL) break;
communities_str[0] = '\0';
- memset(junk_buf, 0, sizeof(junk_buf));
+ memset(junk_buf, 0, sizeof(junk_buf));
/* snarf each community */
while (q < end) {
strncpy(junk_buf, "NO_EXPORT_SUBCONFED ", 20);
else {
snprintf(junk_buf, sizeof(junk_buf), "%u:%u ",
- tvb_get_ntohs(tvb, q),
+ tvb_get_ntohs(tvb, q),
tvb_get_ntohs(tvb, q + 2));
}
- q += 4;
-
+ q += 4;
+
strncat(communities_str, junk_buf, sizeof(junk_buf));
}
/* cleanup end of string */
communities_str[strlen(communities_str) - 1] = '\0';
- ti = proto_tree_add_text(subtree, tvb, o + i, alen + aoff,
+ ti = proto_tree_add_text(subtree, tvb, o + i, tlen + aoff,
"%s: %s (%u %s)",
val_to_str(bgpa.bgpa_type, bgpattr_type, "Unknown"),
- communities_str, alen + aoff,
- (alen + aoff == 1) ? "byte" : "bytes");
+ communities_str, tlen + aoff,
+ (tlen + aoff == 1) ? "byte" : "bytes");
break;
case BGPTYPE_ORIGINATOR_ID:
- if (alen != 4)
+ if (tlen != 4)
goto default_attribute_top;
tvb_memcpy(tvb, ipaddr, o + i + aoff, 4);
- ti = proto_tree_add_text(subtree, tvb, o + i, alen + aoff,
+ ti = proto_tree_add_text(subtree, tvb, o + i, tlen + aoff,
"%s: %s (%u %s)",
val_to_str(bgpa.bgpa_type, bgpattr_type, "Unknown"),
- ip_to_str(ipaddr), alen + aoff, (alen + aoff == 1)
+ ip_to_str(ipaddr), tlen + aoff, (tlen + aoff == 1)
? "byte" : "bytes");
break;
case BGPTYPE_CLUSTER_LIST:
- if (alen % 4 != 0)
+ if (tlen % 4 != 0)
goto default_attribute_top;
- /* (o + i + 3) =
- (o + current attribute + 3 bytes to first tuple) */
- end = o + alen + i + 3;
- q = o + i + 3;
+ /* (o + i + aoff) =
+ (o + current attribute + aoff bytes to first tuple) */
+ q = o + i + aoff;
+ end = q + tlen;
/* must be freed by second switch! */
- /* "alen * 16" (12 digits, 3 dots + space ) should be
- a good estimate of how long the cluster_list string could
+ /* "tlen * 16" (12 digits, 3 dots + space ) should be
+ a good estimate of how long the cluster_list string could
be */
- cluster_list_str = malloc((alen + 1) * 16);
+ cluster_list_str = malloc((tlen + 1) * 16);
if (cluster_list_str == NULL) break;
cluster_list_str[0] = '\0';
- memset(junk_buf, 0, sizeof(junk_buf));
+ memset(junk_buf, 0, sizeof(junk_buf));
/* snarf each cluster list */
tvb_memcpy(tvb, ipaddr, q, 4);
while (q < end) {
snprintf(junk_buf, sizeof(junk_buf), "%s ", ip_to_str(ipaddr));
strncat(cluster_list_str, junk_buf, sizeof(junk_buf));
- q += 4;
+ q += 4;
}
/* cleanup end of string */
cluster_list_str[strlen(cluster_list_str) - 1] = '\0';
- ti = proto_tree_add_text(subtree, tvb, o + i, alen + aoff,
+ ti = proto_tree_add_text(subtree, tvb, o + i, tlen + aoff,
"%s: %s (%u %s)",
val_to_str(bgpa.bgpa_type, bgpattr_type, "Unknown"),
- cluster_list_str, alen + aoff,
- (alen + aoff == 1) ? "byte" : "bytes");
+ cluster_list_str, tlen + aoff,
+ (tlen + aoff == 1) ? "byte" : "bytes");
break;
+ case BGPTYPE_EXTENDED_COMMUNITY:
+ if (tlen %8 != 0)
+ break;
+ ti = proto_tree_add_text(subtree,tvb,o+i,tlen+aoff,
+ "%s: (%u %s)",
+ val_to_str(bgpa.bgpa_type,bgpattr_type,"Unknown"),
+ tlen + aoff,
+ (tlen + aoff == 1) ? "byte" : "bytes");
+ break;
+
default:
default_attribute_top:
- ti = proto_tree_add_text(subtree, tvb, o + i, alen + aoff,
+ ti = proto_tree_add_text(subtree, tvb, o + i, tlen + aoff,
"%s (%u %s)",
val_to_str(bgpa.bgpa_type, bgpattr_type, "Unknown"),
- alen + aoff, (alen + aoff == 1) ? "byte" : "bytes");
+ tlen + aoff, (tlen + aoff == 1) ? "byte" : "bytes");
} /* end of first switch */
subtree2 = proto_item_add_subtree(ti, ett_bgp_attr);
proto_tree_add_text(subtree3, tvb,
o + i + offsetof(struct bgp_attr, bgpa_flags), 1,
"%s", decode_boolean_bitfield(bgpa.bgpa_flags,
- BGP_ATTR_FLAG_TRANSITIVE, 8, "Transitive",
+ BGP_ATTR_FLAG_TRANSITIVE, 8, "Transitive",
"Non-transitive"));
proto_tree_add_text(subtree3, tvb,
o + i + offsetof(struct bgp_attr, bgpa_flags), 1,
proto_tree_add_text(subtree3, tvb,
o + i + offsetof(struct bgp_attr, bgpa_flags), 1,
"%s", decode_boolean_bitfield(bgpa.bgpa_flags,
- BGP_ATTR_FLAG_EXTENDED_LENGTH, 8, "Extended length",
+ BGP_ATTR_FLAG_EXTENDED_LENGTH, 8, "Extended length",
"Regular length"));
proto_tree_add_text(subtree2, tvb,
"Type code: %s (%u)",
val_to_str(bgpa.bgpa_type, bgpattr_type, "Unknown"),
bgpa.bgpa_type);
-
- proto_tree_add_text(subtree2, tvb, o + i + sizeof(bgpa),
- aoff - sizeof(bgpa), "Length: %d %s", alen,
- (alen == 1) ? "byte" : "bytes");
- /* the second switch prints things in the actual subtree of each
- attribute */
+ proto_tree_add_text(subtree2, tvb, o + i + sizeof(bgpa),
+ aoff - sizeof(bgpa), "Length: %d %s", tlen,
+ (tlen == 1) ? "byte" : "bytes");
+
+ /* the second switch prints things in the actual subtree of each
+ attribute */
switch (bgpa.bgpa_type) {
case BGPTYPE_ORIGIN:
- if (alen != 1) {
- proto_tree_add_text(subtree2, tvb, o + i + aoff, alen,
- "Origin (invalid): %u %s", alen,
- (alen == 1) ? "byte" : "bytes");
+ if (tlen != 1) {
+ proto_tree_add_text(subtree2, tvb, o + i + aoff, tlen,
+ "Origin (invalid): %u %s", tlen,
+ (tlen == 1) ? "byte" : "bytes");
} else {
msg = val_to_str(tvb_get_guint8(tvb, o + i + aoff), bgpattr_origin, "Unknown");
proto_tree_add_text(subtree2, tvb, o + i + aoff, 1,
}
break;
case BGPTYPE_AS_PATH:
+ case BGPTYPE_NEW_AS_PATH:
/* check for empty AS_PATH */
- if (alen == 0) {
+ if (tlen == 0) {
free(as_path_str);
break;
}
- ti = proto_tree_add_text(subtree2, tvb, o + i + aoff, alen,
+ ti = proto_tree_add_text(subtree2, tvb, o + i + aoff, tlen,
"AS path: %s", as_path_str);
as_paths_tree = proto_item_add_subtree(ti, ett_bgp_as_paths);
- /* (o + i + 3) =
- (o + current attribute + 3 bytes to first tuple) */
- end = o + alen + i + 3;
- q = o + i + 3;
-
+ /* (o + i + aoff) =
+ (o + current attribute + aoff bytes to first tuple) */
+ q = o + i + aoff;
+ end = q + tlen;
+
/* snarf each AS path tuple, we have to step through each one
again to make a separate subtree so we can't just reuse
as_path_str from above */
}
length = tvb_get_guint8(tvb, q++);
- /* snarf each value in path, we're just going to reuse
+ /* snarf each value in path, we're just going to reuse
as_path_str since we already have it malloced */
for (j = 0; j < length; j++) {
- snprintf(junk_buf, sizeof(junk_buf), "%u%s", tvb_get_ntohs(tvb, q),
- (type == AS_SET || type == AS_CONFED_SET)
- ? ", " : " ");
+ snprintf(junk_buf, sizeof(junk_buf), "%u%s",
+ (asn_len == 2) ?
+ tvb_get_ntohs(tvb, q) : tvb_get_ntohl(tvb, q),
+ (type == AS_SET || type == AS_CONFED_SET) ? ", " : " ");
strncat(as_path_str, junk_buf, sizeof(junk_buf));
- q += 2;
+ q += asn_len;
}
/* cleanup end of string */
}
/* length here means number of ASs, ie length * 2 bytes */
- ti = proto_tree_add_text(as_paths_tree, tvb,
- q - length * 2 - 2,
- length * 2 + 2, "AS path segment: %s", as_path_str);
+ ti = proto_tree_add_text(as_paths_tree, tvb,
+ q - length * asn_len - 2,
+ length * asn_len + 2, "AS path segment: %s", as_path_str);
as_path_tree = proto_item_add_subtree(ti, ett_bgp_as_paths);
- proto_tree_add_text(as_path_tree, tvb, q - length * 2 - 2,
+ proto_tree_add_text(as_path_tree, tvb, q - length * asn_len - 2,
1, "Path segment type: %s (%u)",
val_to_str(type, as_segment_type, "Unknown"), type);
- proto_tree_add_text(as_path_tree, tvb, q - length * 2 - 1,
+ proto_tree_add_text(as_path_tree, tvb, q - length * asn_len - 1,
1, "Path segment length: %u %s", length,
(length == 1) ? "AS" : "ASs");
/* backup and reprint path segment value(s) only */
- q -= 2 * length;
+ q -= asn_len * length;
as_path_str[0] = '\0';
for (j = 0; j < length; j++) {
- snprintf(junk_buf, sizeof(junk_buf), "%u ", tvb_get_ntohs(tvb, q));
+ snprintf(junk_buf, sizeof(junk_buf), "%u ",
+ (asn_len == 2) ?
+ tvb_get_ntohs(tvb, q) : tvb_get_ntohl(tvb, q));
strncat(as_path_str, junk_buf, sizeof(junk_buf));
- q += 2;
+ q += asn_len;
}
as_path_str[strlen(as_path_str) - 1] = '\0';
- proto_tree_add_text(as_path_tree, tvb, q - length * 2,
- length * 2, "Path segment value: %s", as_path_str);
+ proto_tree_add_text(as_path_tree, tvb, q - length * asn_len,
+ length * asn_len, "Path segment value: %s", as_path_str);
}
free(as_path_str);
break;
case BGPTYPE_NEXT_HOP:
- if (alen != 4) {
- proto_tree_add_text(subtree2, tvb, o + i + aoff, alen,
- "Next hop (invalid): %u %s", alen,
- (alen == 1) ? "byte" : "bytes");
+ if (tlen != 4) {
+ proto_tree_add_text(subtree2, tvb, o + i + aoff, tlen,
+ "Next hop (invalid): %u %s", tlen,
+ (tlen == 1) ? "byte" : "bytes");
} else {
tvb_memcpy(tvb, ipaddr, o + i + aoff, 4);
- proto_tree_add_text(subtree2, tvb, o + i + aoff, alen,
+ proto_tree_add_text(subtree2, tvb, o + i + aoff, tlen,
"Next hop: %s", ip_to_str(ipaddr));
}
break;
case BGPTYPE_MULTI_EXIT_DISC:
- if (alen != 4) {
- proto_tree_add_text(subtree2, tvb, o + i + aoff, alen,
+ if (tlen != 4) {
+ proto_tree_add_text(subtree2, tvb, o + i + aoff, tlen,
"Multiple exit discriminator (invalid): %u %s",
- alen, (alen == 1) ? "byte" : "bytes");
+ tlen, (tlen == 1) ? "byte" : "bytes");
} else {
- proto_tree_add_text(subtree2, tvb, o + i + aoff, alen,
+ proto_tree_add_text(subtree2, tvb, o + i + aoff, tlen,
"Multiple exit discriminator: %u",
tvb_get_ntohl(tvb, o + i + aoff));
}
break;
case BGPTYPE_LOCAL_PREF:
- if (alen != 4) {
- proto_tree_add_text(subtree2, tvb, o + i + aoff, alen,
- "Local preference (invalid): %u %s", alen,
- (alen == 1) ? "byte" : "bytes");
+ if (tlen != 4) {
+ proto_tree_add_text(subtree2, tvb, o + i + aoff, tlen,
+ "Local preference (invalid): %u %s", tlen,
+ (tlen == 1) ? "byte" : "bytes");
} else {
- proto_tree_add_text(subtree2, tvb, o + i + aoff, alen,
+ proto_tree_add_text(subtree2, tvb, o + i + aoff, tlen,
"Local preference: %u", tvb_get_ntohl(tvb, o + i + aoff));
}
break;
case BGPTYPE_ATOMIC_AGGREGATE:
- if (alen != 0) {
- proto_tree_add_text(subtree2, tvb, o + i + aoff, alen,
- "Atomic aggregate (invalid): %u %s", alen,
- (alen == 1) ? "byte" : "bytes");
+ if (tlen != 0) {
+ proto_tree_add_text(subtree2, tvb, o + i + aoff, tlen,
+ "Atomic aggregate (invalid): %u %s", tlen,
+ (tlen == 1) ? "byte" : "bytes");
}
break;
case BGPTYPE_AGGREGATOR:
- if (alen != 6) {
- proto_tree_add_text(subtree2, tvb, o + i + aoff, alen,
- "Aggregator (invalid): %u %s", alen,
- (alen == 1) ? "byte" : "bytes");
- } else {
+ if (tlen != 6 && tlen != 8) {
+ proto_tree_add_text(subtree2, tvb, o + i + aoff, tlen,
+ "Aggregator (invalid): %u %s", tlen,
+ (tlen == 1) ? "byte" : "bytes");
+ break;
+ }
+ case BGPTYPE_NEW_AGGREGATOR:
+ if (bgpa.bgpa_type == BGPTYPE_NEW_AGGREGATOR && tlen != 8)
+ proto_tree_add_text(subtree2, tvb, o + i + aoff, tlen,
+ "Aggregator (invalid): %u %s", tlen,
+ (tlen == 1) ? "byte" : "bytes");
+ else {
+ asn_len = tlen - 4;
proto_tree_add_text(subtree2, tvb, o + i + aoff, 2,
- "Aggregator AS: %u", tvb_get_ntohs(tvb, o + i + aoff));
- tvb_memcpy(tvb, ipaddr, o + i + aoff + 2, 4);
- proto_tree_add_text(subtree2, tvb, o + i + aoff + 2, 4,
- "Aggregator origin: %s",
- ip_to_str(ipaddr));
+ "Aggregator AS: %u", asn_len == 2 ?
+ tvb_get_ntohs(tvb, o + i + aoff) :
+ tvb_get_ntohl(tvb, o + i + aoff));
+ tvb_memcpy(tvb, ipaddr, o + i + aoff + asn_len, 4);
+ proto_tree_add_text(subtree2, tvb, o + i + aoff + asn_len,
+ 4, "Aggregator origin: %s", ip_to_str(ipaddr));
}
break;
case BGPTYPE_COMMUNITIES:
- if (alen % 4 != 0) {
- proto_tree_add_text(subtree2, tvb, o + i + aoff, alen,
- "Communities (invalid): %u %s", alen,
- (alen == 1) ? "byte" : "bytes");
+ if (tlen % 4 != 0) {
+ proto_tree_add_text(subtree2, tvb, o + i + aoff, tlen,
+ "Communities (invalid): %u %s", tlen,
+ (tlen == 1) ? "byte" : "bytes");
free(communities_str);
break;
}
- ti = proto_tree_add_text(subtree2, tvb, o + i + aoff, alen,
+ ti = proto_tree_add_text(subtree2, tvb, o + i + aoff, tlen,
"Communities: %s", communities_str);
- communities_tree = proto_item_add_subtree(ti,
+ communities_tree = proto_item_add_subtree(ti,
ett_bgp_communities);
- /* (o + i + 3) =
- (o + current attribute + 3 bytes to first tuple) */
- end = o + alen + i + 3;
- q = o + i + 3;
+ /* (o + i + aoff) =
+ (o + current attribute + aoff bytes to first tuple) */
+ q = o + i + aoff;
+ end = q + tlen;
/* snarf each community */
while (q < end) {
/* check for reserved values */
- if (tvb_get_ntohs(tvb, q) == FOURHEX0 || tvb_get_ntohs(tvb, q) == FOURHEXF) {
- /* check for well-known communities */
- if (tvb_get_ntohl(tvb, q) == BGP_COMM_NO_EXPORT)
- proto_tree_add_text(communities_tree, tvb,
- q - 3 + aoff, 4,
- "Community: NO_EXPORT (0x%x)", tvb_get_ntohl(tvb, q));
- else if (tvb_get_ntohl(tvb, q) == BGP_COMM_NO_ADVERTISE)
- proto_tree_add_text(communities_tree, tvb,
- q - 3 + aoff, 4,
- "Community: NO_ADVERTISE (0x%x)", pntohl(q));
- else if (tvb_get_ntohl(tvb, q) == BGP_COMM_NO_EXPORT_SUBCONFED)
- proto_tree_add_text(communities_tree, tvb,
- q - 3 + aoff, 4,
- "Community: NO_EXPORT_SUBCONFED (0x%x)",
- tvb_get_ntohl(tvb, q));
- else
- proto_tree_add_text(communities_tree, tvb,
- q - 3 + aoff, 4,
- "Community (reserved): 0x%x", tvb_get_ntohl(tvb, q));
+ guint32 community = tvb_get_ntohl(tvb, q);
+ if ((community & 0xFFFF0000) == FOURHEX0 ||
+ (community & 0xFFFF0000) == FOURHEXF) {
+ proto_tree_add_text(communities_tree, tvb,
+ q - 3 + aoff, 4,
+ "Community: %s (0x%08x)",
+ val_to_str(community, community_vals, "(reserved)"),
+ community);
}
else {
-
ti = proto_tree_add_text(communities_tree, tvb,
- q - 3 + aoff, 4, "Community: %u:%u",
+ q - 3 + aoff, 4, "Community: %u:%u",
tvb_get_ntohs(tvb, q), tvb_get_ntohs(tvb, q + 2));
- community_tree = proto_item_add_subtree(ti,
+ community_tree = proto_item_add_subtree(ti,
ett_bgp_communities);
proto_tree_add_text(community_tree, tvb, q - 3 + aoff,
2, "Community AS: %u", tvb_get_ntohs(tvb, q));
- proto_tree_add_text(community_tree, tvb, q - 1 + aoff,
+ proto_tree_add_text(community_tree, tvb, q - 1 + aoff,
2, "Community value: %u", tvb_get_ntohs(tvb, q + 2));
}
free(communities_str);
break;
case BGPTYPE_ORIGINATOR_ID:
- if (alen != 4) {
- proto_tree_add_text(subtree2, tvb, o + i + aoff, alen,
- "Originator identifier (invalid): %u %s", alen,
- (alen == 1) ? "byte" : "bytes");
+ if (tlen != 4) {
+ proto_tree_add_text(subtree2, tvb, o + i + aoff, tlen,
+ "Originator identifier (invalid): %u %s", tlen,
+ (tlen == 1) ? "byte" : "bytes");
} else {
tvb_memcpy(tvb, ipaddr, o + i + aoff, 4);
- proto_tree_add_text(subtree2, tvb, o + i + aoff, alen,
+ proto_tree_add_text(subtree2, tvb, o + i + aoff, tlen,
"Originator identifier: %s",
ip_to_str(ipaddr));
}
break;
- case BGPTYPE_MP_REACH_NLRI:
+ case BGPTYPE_MP_REACH_NLRI:
+ /*
+ * RFC 2545 specifies that there may be more than one
+ * address in the MP_REACH_NLRI attribute in section
+ * 3, "Constructing the Next Hop field".
+ *
+ * Yes, RFC 2858 says you can't do that, and, yes, RFC
+ * 2858 obsoletes RFC 2283, which says you can do that,
+ * but that doesn't mean we shouldn't dissect packets
+ * that conform to RFC 2283 but not RFC 2858, as some
+ * device on the network might implement the 2283-style
+ * BGP extensions rather than RFC 2858-style extensions.
+ */
af = tvb_get_ntohs(tvb, o + i + aoff);
proto_tree_add_text(subtree2, tvb, o + i + aoff, 2,
"Address family: %s (%u)",
- val_to_str(af, afnumber, "Unknown"), af);
+ val_to_str(af, afn_vals, "Unknown"), af);
+ saf = tvb_get_guint8(tvb, o + i + aoff + 2) ;
proto_tree_add_text(subtree2, tvb, o + i + aoff + 2, 1,
"Subsequent address family identifier: %s (%u)",
- val_to_str(tvb_get_guint8(tvb, o + i + aoff + 2), bgpattr_nlri_safi,
- tvb_get_guint8(tvb, o + i + aoff + 2) >= 128 ? "Vendor specific" : "Unknown"),
- tvb_get_guint8(tvb, o + i + aoff + 2));
+ val_to_str(saf, bgpattr_nlri_safi, saf >= 128 ? "Vendor specific" : "Unknown"),
+ saf);
+ if (af != AFNUM_INET && af != AFNUM_INET6 && af != AFNUM_L2VPN) {
+ /*
+ * The addresses don't contain lengths, so if we
+ * don't understand the address family type, we
+ * cannot parse the subsequent addresses as we
+ * don't know how long they are.
+ *
+ * XXX - we should put a protocol tree item in for
+ * this, as an unknown blob.
+ */
+ break;
+ }
+ nexthop_len = tvb_get_guint8(tvb, o + i + aoff + 3);
ti = proto_tree_add_text(subtree2, tvb, o + i + aoff + 3, 1,
"Next hop network address (%d %s)",
- tvb_get_guint8(tvb, o + i + aoff + 3),
- (tvb_get_guint8(tvb, o + i + aoff + 3) == 1) ? "byte" : "bytes");
- if (af == AFNUM_INET || af == AFNUM_INET6) {
- int j, advance;
- const char *s;
-
- subtree3 = proto_item_add_subtree(ti,
- ett_bgp_mp_reach_nlri);
-
- j = 0;
- while (j < tvb_get_guint8(tvb, o + i + aoff + 3)) {
- if (af == AFNUM_INET)
- advance = 4;
- else if (af == AFNUM_INET6)
- advance = 16;
- else
- break;
- if (j + advance > tvb_get_guint8(tvb, o + i + aoff + 3))
+ nexthop_len, plurality(nexthop_len, "byte", "bytes"));
+ subtree3 = proto_item_add_subtree(ti, ett_bgp_mp_nhna);
+ j = 0;
+ while (j < nexthop_len) {
+ advance = mp_addr_to_str(af, saf, tvb, o + i + aoff + 4 + j,
+ junk_buf, sizeof(junk_buf)) ;
+ if (advance == 0) /* catch if this is a unknown AFI type*/
+ break;
+ if (j + advance > nexthop_len)
break;
-
- if (af == AFNUM_INET) {
- tvb_memcpy(tvb, ipaddr, o + i + aoff + 4 + j, 4);
- s = ip_to_str(ipaddr);
- } else {
- tvb_memcpy(tvb, ip6addr.u6_addr.u6_addr8,
- o + i + aoff + 4 + j, sizeof ip6addr);
- s = ip6_to_str(&ip6addr);
- }
- proto_tree_add_text(subtree3, tvb,
- o + i + aoff + 4 + j, advance,
- "Next hop: %s", s);
- j += advance;
- }
+ proto_tree_add_text(subtree3, tvb,o + i + aoff + 4 + j,
+ advance, "Next hop: %s (%u)", junk_buf, advance);
+ j += advance;
}
+ tlen -= nexthop_len + 4;
+ aoff += nexthop_len + 4 ;
- alen -= tvb_get_guint8(tvb, o + i + aoff + 3) + 4;
- aoff += tvb_get_guint8(tvb, o + i + aoff + 3) + 4;
- off = 0;
+ off = 0;
snpa = tvb_get_guint8(tvb, o + i + aoff);
ti = proto_tree_add_text(subtree2, tvb, o + i + aoff, 1,
"Subnetwork points of attachment: %u", snpa);
off++;
- if (snpa)
- subtree3 = proto_item_add_subtree(ti,
- ett_bgp_mp_reach_nlri);
- for (/*nothing*/; snpa > 0; snpa--) {
- proto_tree_add_text(subtree3, tvb, o + i + aoff + off, 1,
- "SNPA length: %u", tvb_get_guint8(tvb, o + i + aoff + off));
- off++;
- proto_tree_add_text(subtree3, tvb, o + i + aoff + off,
- tvb_get_guint8(tvb, o + i + aoff + off - 1),
- "SNPA (%u %s)", tvb_get_guint8(tvb, o + i + aoff + off - 1),
- (tvb_get_guint8(tvb, o + i + aoff + off - 1) == 1) ? "byte" : "bytes");
- off += tvb_get_guint8(tvb, o + i + aoff + off - 1);
- }
-
- alen -= off;
+ if (snpa) {
+ subtree3 = proto_item_add_subtree(ti, ett_bgp_mp_snpa);
+ for (/*nothing*/; snpa > 0; snpa--) {
+ proto_tree_add_text(subtree3, tvb, o + i + aoff + off, 1,
+ "SNPA length: %u", tvb_get_guint8(tvb, o + i + aoff + off));
+ off++;
+ proto_tree_add_text(subtree3, tvb, o + i + aoff + off,
+ tvb_get_guint8(tvb, o + i + aoff + off - 1),
+ "SNPA (%u %s)", tvb_get_guint8(tvb, o + i + aoff + off - 1),
+ (tvb_get_guint8(tvb, o + i + aoff + off - 1) == 1) ? "byte" : "bytes");
+ off += tvb_get_guint8(tvb, o + i + aoff + off - 1);
+ }
+ }
+ tlen -= off;
aoff += off;
- ti = proto_tree_add_text(subtree2, tvb, o + i + aoff, alen,
- "Network layer reachability information (%u %s)",
- alen, (alen == 1) ? "byte" : "bytes");
- if (alen)
- subtree3 = proto_item_add_subtree(ti,
- ett_bgp_mp_unreach_nlri);
- while (alen > 0) {
- int advance;
- char buf[256];
-
- if (af == AFNUM_INET) {
- advance = decode_prefix4(tvb, o + i + aoff, buf,
- sizeof(buf));
- } else if (af == AFNUM_INET6) {
- advance = decode_prefix6(tvb, o + i + aoff, buf,
- sizeof(buf));
- } else
- break;
- if (advance < 0)
- break;
- if (alen < advance)
- break;
- proto_tree_add_text(subtree3, tvb, o + i + aoff, advance,
- "Network layer reachability information: %s", buf);
-
- alen -= advance;
- aoff += advance;
- }
+ ti = proto_tree_add_text(subtree2, tvb, o + i + aoff, tlen,
+ "Network layer reachability information (%u %s)",
+ tlen, (tlen == 1) ? "byte" : "bytes");
+ if (tlen) {
+ subtree3 = proto_item_add_subtree(ti,ett_bgp_mp_reach_nlri);
+
+ while (tlen > 0) {
+ advance = decode_prefix_MP(af, saf, tvb, o + i + aoff , junk_buf, sizeof(junk_buf)) ;
+ proto_tree_add_text(subtree3, tvb, o + i + aoff, advance, "%s", junk_buf) ;
+ tlen -= advance;
+ aoff += advance;
+ }
+ }
break;
- case BGPTYPE_MP_UNREACH_NLRI:
- af = tvb_get_ntohs(tvb, o + i + aoff);
+ case BGPTYPE_MP_UNREACH_NLRI:
+ af = tvb_get_ntohs(tvb, o + i + aoff);
proto_tree_add_text(subtree2, tvb, o + i + aoff, 2,
"Address family: %s (%u)",
- val_to_str(af, afnumber, "Unknown"), af);
+ val_to_str(af, afn_vals, "Unknown"), af);
+ saf = tvb_get_guint8(tvb, o + i + aoff + 2) ;
proto_tree_add_text(subtree2, tvb, o + i + aoff + 2, 1,
"Subsequent address family identifier: %s (%u)",
- val_to_str(tvb_get_guint8(tvb, o + i + aoff + 2), bgpattr_nlri_safi,
- tvb_get_guint8(tvb, o + i + aoff + 2) >= 128 ? "Vendor specific" : "Unknown"),
- tvb_get_guint8(tvb, o + i + aoff + 2));
+ val_to_str(saf, bgpattr_nlri_safi, saf >= 128 ? "Vendor specific" : "Unknown"),
+ saf);
ti = proto_tree_add_text(subtree2, tvb, o + i + aoff + 3,
- alen - 3, "Withdrawn routes (%u %s)", alen - 3,
- (alen - 3 == 1) ? "byte" : "bytes");
+ tlen - 3, "Withdrawn routes (%u %s)", tlen - 3,
+ (tlen - 3 == 1) ? "byte" : "bytes");
- alen -= 3;
+ tlen -= 3;
aoff += 3;
- if (alen > 0)
- subtree3 = proto_item_add_subtree(ti,
- ett_bgp_mp_unreach_nlri);
- while (alen > 0) {
- int advance;
- char buf[256];
-
- if (af == AFNUM_INET) {
- advance = decode_prefix4(tvb, o + i + aoff, buf,
- sizeof(buf));
- } else if (af == AFNUM_INET6) {
- advance = decode_prefix6(tvb, o + i + aoff, buf,
- sizeof(buf));
- } else
- break;
- if (advance < 0)
- break;
- if (alen < advance)
- break;
- proto_tree_add_text(subtree3, tvb, o + i + aoff, advance,
- "Withdrawn route: %s", buf);
-
- alen -= advance;
- aoff += advance;
- }
-
- break;
+ if (tlen > 0) {
+ subtree3 = proto_item_add_subtree(ti,ett_bgp_mp_unreach_nlri);
+
+ while (tlen > 0) {
+ advance = decode_prefix_MP(af, saf, tvb, o + i + aoff , junk_buf, sizeof(junk_buf)) ;
+ proto_tree_add_text(subtree3, tvb, o + i + aoff, advance, "%s", junk_buf) ;
+ tlen -= advance;
+ aoff += advance;
+ if (advance==1) /* catch if this is a unknown AFI type*/
+ break;
+ }
+ }
+ break;
case BGPTYPE_CLUSTER_LIST:
- if (alen % 4 != 0) {
- proto_tree_add_text(subtree2, tvb, o + i + aoff, alen,
- "Cluster list (invalid): %u %s", alen,
- (alen == 1) ? "byte" : "bytes");
+ if (tlen % 4 != 0) {
+ proto_tree_add_text(subtree2, tvb, o + i + aoff, tlen,
+ "Cluster list (invalid): %u %s", tlen,
+ (tlen == 1) ? "byte" : "bytes");
free(cluster_list_str);
break;
}
- ti = proto_tree_add_text(subtree2, tvb, o + i + aoff, alen,
+ ti = proto_tree_add_text(subtree2, tvb, o + i + aoff, tlen,
"Cluster list: %s", cluster_list_str);
- cluster_list_tree = proto_item_add_subtree(ti,
+ cluster_list_tree = proto_item_add_subtree(ti,
ett_bgp_cluster_list);
- /* (p + i + 3) =
- (p + current attribute + 3 bytes to first tuple) */
- end = o + alen + i + 3;
- q = o + i + 3;
+ /* (o + i + aoff) =
+ (o + current attribute + aoff bytes to first tuple) */
+ q = o + i + aoff;
+ end = q + tlen;
/* snarf each cluster identifier */
while (q < end) {
tvb_memcpy(tvb, ipaddr, q, 4);
ti = proto_tree_add_text(cluster_list_tree, tvb,
- q - 3 + aoff, 4, "Cluster identifier: %s",
+ q - 3 + aoff, 4, "Cluster identifier: %s",
ip_to_str(ipaddr));
q += 4;
free(cluster_list_str);
break;
+ case BGPTYPE_EXTENDED_COMMUNITY:
+ if (tlen %8 != 0) {
+ proto_tree_add_text(subtree3, tvb, o + i + aoff, tlen, "Extended community (invalid) : %u %s", tlen,
+ (tlen == 1) ? "byte" : "bytes") ;
+ } else {
+ q = o + i + aoff ;
+ end = o + i + aoff + tlen ;
+ ti = proto_tree_add_text(subtree2,tvb,q,tlen, "Carried Extended communities");
+ subtree3 = proto_item_add_subtree(ti,ett_bgp_extended_communities) ;
+
+ while (q < end) {
+ junk_buf_len=0;
+ ext_com = tvb_get_ntohs(tvb,q) ;
+ junk_buf_len=snprintf(junk_buf+junk_buf_len, sizeof(junk_buf), "%s",
+ val_to_str(ext_com,bgpext_com_type,"Unknown"));
+ switch (ext_com) {
+ case BGP_EXT_COM_RT_0:
+ case BGP_EXT_COM_RO_0:
+ junk_buf_len+=snprintf(junk_buf+junk_buf_len, sizeof(junk_buf)-junk_buf_len, ": %u%s%d",
+ tvb_get_ntohs(tvb,q+2),":",tvb_get_ntohl(tvb,q+4));
+ junk_buf[junk_buf_len]='\0';
+ proto_tree_add_text(subtree3,tvb,q,8, "%s",junk_buf);
+ break ;
+ case BGP_EXT_COM_RT_1:
+ case BGP_EXT_COM_RO_1:
+ tvb_memcpy(tvb,ipaddr,q+2,4);
+ junk_buf_len+=snprintf(junk_buf+junk_buf_len, sizeof(junk_buf)-junk_buf_len, ": %s%s%u",
+ ip_to_str(ipaddr),":",tvb_get_ntohs(tvb,q+6));
+ junk_buf[junk_buf_len]='\0';
+ proto_tree_add_text(subtree3,tvb,q,8, "%s",junk_buf);
+ break;
+ case BGP_EXT_COM_VPN_ORIGIN:
+ case BGP_EXT_COM_OSPF_RID:
+ tvb_memcpy(tvb,ipaddr,q+2,4);
+ junk_buf_len+=snprintf(junk_buf+junk_buf_len, sizeof(junk_buf)-junk_buf_len, ": %s",
+ ip_to_str(ipaddr));
+ junk_buf[junk_buf_len]='\0';
+ proto_tree_add_text(subtree3,tvb,q,8, "%s",junk_buf);
+ break;
+ case BGP_EXT_COM_OSPF_RTYPE:
+ tvb_memcpy(tvb,ipaddr,q+2,4);
+ junk_buf_len+=snprintf(junk_buf+junk_buf_len, sizeof(junk_buf)-junk_buf_len, ": Area:%s %s",
+ ip_to_str(ipaddr),
+ val_to_str(tvb_get_guint8(tvb,q+6),bgpext_ospf_rtype,"Unknown"));
+ /* print OSPF Metric type if selected */
+ /* always print E2 even if not external route -- receiving router should ignore */
+ if ( (tvb_get_guint8(tvb,q+7)) & BGP_OSPF_RTYPE_METRIC_TYPE ) {
+ junk_buf_len+=snprintf(junk_buf+junk_buf_len,sizeof(junk_buf)-junk_buf_len," E2");
+ } else if (tvb_get_guint8(tvb,q+6)==(BGP_OSPF_RTYPE_EXT ||BGP_OSPF_RTYPE_NSSA ) ) {
+ junk_buf_len+=snprintf(junk_buf+junk_buf_len,sizeof(junk_buf)-junk_buf_len," E1");
+ }
+ junk_buf[junk_buf_len]='\0';
+ proto_tree_add_text(subtree3,tvb,q,8, "%s",junk_buf);
+ break;
+ case BGP_EXT_COM_LINKBAND:
+ tvb_memcpy(tvb,ipaddr,q+2,4); /* need to check on IEEE format on all platforms */
+ junk_buf_len+=snprintf(junk_buf+junk_buf_len, sizeof(junk_buf)-junk_buf_len, ": %.3f Mbps",
+ ((double)*ipaddr)*8/1000000);
+ junk_buf[junk_buf_len]='\0';
+ proto_tree_add_text(subtree3,tvb,q,8, "%s",junk_buf);
+ break;
+ case BGP_EXT_COM_L2INFO:
+ junk_buf_len+=snprintf(junk_buf+junk_buf_len, sizeof(junk_buf)-junk_buf_len,
+ ": %s, Control Flags: %s%s%s%s%s, MTU: %u %s",
+ val_to_str(tvb_get_guint8(tvb,q+2),bgp_l2vpn_encaps,"Unknown"),
+ tvb_get_guint8(tvb,q+3) ? "" : "none",
+ tvb_get_ntohs(tvb,q+3)&0x08 ? "Q" : "",
+ tvb_get_ntohs(tvb,q+3)&0x04 ? "F" : "",
+ tvb_get_ntohs(tvb,q+3)&0x02 ? "C" : "",
+ tvb_get_ntohs(tvb,q+3)&0x01 ? "S" : "",
+ tvb_get_ntohs(tvb,q+4),
+ tvb_get_ntohs(tvb,q+4)==1 ? "byte" : "bytes");
+ junk_buf[junk_buf_len]='\0';
+ ti = proto_tree_add_text(subtree3,tvb,q,8, "%s",junk_buf);
+
+ subtree4 = proto_item_add_subtree(ti,ett_bgp_extended_communities) ;
+ proto_tree_add_text(subtree4,tvb,q+2,1, "Encapsulation: %s",
+ val_to_str(tvb_get_guint8(tvb,q+2),bgp_l2vpn_encaps,"Unknown"));
+ proto_tree_add_text(subtree4,tvb,q+3,1, "Control Flags: %s%sControl Word %s required, Sequenced delivery %s required",
+ tvb_get_ntohs(tvb,q+3)&0x08 ? "Q flag (Reserved) set" : "",
+ tvb_get_ntohs(tvb,q+3)&0x04 ? "F flag (reserved) set" : "",
+ tvb_get_ntohs(tvb,q+3)&0x02 ? "is" : "not",
+ tvb_get_ntohs(tvb,q+3)&0x01 ? "is" : "not");
+ proto_tree_add_text(subtree4,tvb,q+4,2, "MTU: %u %s",
+ tvb_get_ntohs(tvb,q+4),
+ tvb_get_ntohs(tvb,q+4)==1 ? "byte" : "bytes");
+ break;
+ default:
+ junk_buf_len+=snprintf(junk_buf+junk_buf_len, sizeof(junk_buf)-junk_buf_len, " ");
+ junk_buf[junk_buf_len]='\0';
+ proto_tree_add_text(subtree3,tvb,q,8, "%s",junk_buf);
+ break ;
+ }
+ q = q + 8 ;
+ }
+ }
+ break;
default:
- proto_tree_add_text(subtree2, tvb, o + i + aoff, alen,
- "Unknown (%d %s)", alen, (alen == 1) ? "byte" :
+ proto_tree_add_text(subtree2, tvb, o + i + aoff, tlen,
+ "Unknown (%d %s)", tlen, (tlen == 1) ? "byte" :
"bytes");
break;
} /* end of second switch */
i += alen + aoff;
}
+
o += 2 + len;
/* NLRI */
end = o + len;
while (o < end) {
i = decode_prefix4(tvb, o, junk_buf, sizeof(junk_buf));
+ if (i < 0 || 32 < i) {
+ proto_tree_add_text (tree, tvb, o, len,
+ "Invalid NLRI prefix length: %u",
+ tvb_get_guint8(tvb, o) );
+ return;
+ }
+
proto_tree_add_text(subtree, tvb, o, i, "%s", junk_buf);
o += i;
}
/* snarf message */
tvb_memcpy(tvb, bgpn.bgpn_marker, offset, BGP_MIN_NOTIFICATION_MSG_SIZE);
- hlen = ntohs(bgpn.bgpn_len);
+ hlen = g_ntohs(bgpn.bgpn_len);
/* print error code */
proto_tree_add_text(tree, tvb,
static void
dissect_bgp_route_refresh(tvbuff_t *tvb, int offset, proto_tree *tree)
{
- u_int i; /* tmp */
+ guint16 i; /* tmp */
+ int p; /* tvb offset counter */
+ int pend; /* end of list of entries for one orf type */
+ guint16 hlen; /* tvb RR msg length */
+ proto_item *ti; /* tree item */
+ proto_item *ti1; /* tree item */
+ proto_tree *subtree; /* tree for orf */
+ proto_tree *subtree1; /* tree for orf entry */
+ guint8 orftype; /* ORF Type */
+ guint8 orfwhen; /* ORF flag: immediate, defer */
+ guint16 orflen; /* ORF len */
+ guint8 entryflag; /* ORF Entry flag: action(add,del,delall) match(permit,deny) */
+ guint32 entryseq; /* ORF Entry sequence number */
+ int entrylen; /* ORF Entry length */
+ guint8 pfx_ge; /* ORF PrefixList mask lower bound */
+ guint8 pfx_le; /* ORF PrefixList mask upper bound */
+ char pfxbuf[20]; /* ORF PrefixList prefix string buffer */
+ int pfx_masklen; /* ORF PRefixList prefix mask length */
+
+/*
+example 1
+ 00 1c 05 hlen=28
+ 00 01 00 01 afi,safi= ipv4-unicast
+ 02 80 00 01 defer, prefix-orf, len=1
+ 80 removeall
+example 2
+ 00 25 05 hlen=37
+ 00 01 00 01 afi,saif= ipv4-unicast
+ 01 80 00 0a immediate, prefix-orf, len=10
+ 00 add
+ 00 00 00 05 seqno = 5
+ 12 ge = 18
+ 18 le = 24
+ 10 07 02 prefix = 7.2.0.0/16
+*/
+ hlen = tvb_get_ntohs(tvb, offset + BGP_MARKER_SIZE);
+ p = offset + BGP_HEADER_SIZE;
/* AFI */
- i = tvb_get_ntohs(tvb, offset + BGP_HEADER_SIZE);
- proto_tree_add_text(tree, tvb, offset + BGP_HEADER_SIZE, 2,
+ i = tvb_get_ntohs(tvb, p);
+ proto_tree_add_text(tree, tvb, p, 2,
"Address family identifier: %s (%u)",
- val_to_str(i, afnumber, "Unknown"), i);
- offset += 2;
+ val_to_str(i, afn_vals, "Unknown"), i);
+ p += 2;
/* Reserved */
- proto_tree_add_text(tree, tvb, offset + BGP_HEADER_SIZE + 2, 1,
+ proto_tree_add_text(tree, tvb, p, 1,
"Reserved: 1 byte");
- offset++;
+ p++;
/* SAFI */
- i = tvb_get_guint8(tvb, offset);
- proto_tree_add_text(tree, tvb, offset + BGP_HEADER_SIZE + 3, 1,
+ i = tvb_get_guint8(tvb, p);
+ proto_tree_add_text(tree, tvb, p, 1,
"Subsequent address family identifier: %s (%u)",
val_to_str(i, bgpattr_nlri_safi,
- i >= 128 ? "Vendor specific" : "Unknown"),
+ i >= 128 ? "Vendor specific" : "Unknown"),
i);
+ p++;
+ if ( hlen == BGP_HEADER_SIZE + 4 )
+ return;
+ while (p < offset + hlen) {
+ /* ORF type */
+ orfwhen = tvb_get_guint8(tvb, p);
+ orftype = tvb_get_guint8(tvb, p+1);
+ orflen = tvb_get_ntohs(tvb, p+2);
+ ti = proto_tree_add_text(tree, tvb, p , orflen + 4 , "ORF information (%u bytes)", orflen + 4);
+ subtree = proto_item_add_subtree(ti, ett_bgp_orf);
+ proto_tree_add_text(subtree, tvb, p , 1, "ORF flag: %s", val_to_str(orfwhen, orf_when_vals,"UNKNOWN"));
+ proto_tree_add_text(subtree, tvb, p+1 , 1, "ORF type: %s", val_to_str(orftype, orf_type_vals,"UNKNOWN"));
+ proto_tree_add_text(subtree, tvb, p+2 , 2, "ORF len: %u %s", orflen, (orflen == 1) ? "byte" : "bytes");
+ p += 4;
+
+ if (orftype != BGP_ORF_PREFIX_CISCO){
+ proto_tree_add_text(subtree, tvb, p, orflen, "ORFEntry-Unknown (%u bytes)", orflen);
+ p += orflen;
+ continue;
+ }
+ pend = p + orflen;
+ while (p < pend) {
+ entryflag = tvb_get_guint8(tvb, p);
+ if ((entryflag & BGP_ORF_ACTION) == BGP_ORF_REMOVEALL) {
+ ti1 = proto_tree_add_text(subtree, tvb, p, 1, "ORFEntry-PrefixList (1 byte)");
+ subtree1 = proto_item_add_subtree(ti1, ett_bgp_orf_entry);
+ proto_tree_add_text(subtree1, tvb, p , 1, "RemoveAll");
+ p++;
+ } else {
+ entryseq = tvb_get_ntohl(tvb, p+1);
+ pfx_ge = tvb_get_guint8(tvb, p+5);
+ pfx_le = tvb_get_guint8(tvb, p+6);
+ /* calc len */
+ decode_prefix4(tvb, p+7, pfxbuf, sizeof(pfxbuf));
+ pfx_masklen = tvb_get_guint8(tvb, p+7);
+ entrylen = 7+ 1 + (pfx_masklen+7)/8;
+ ti1 = proto_tree_add_text(subtree, tvb, p, entrylen, "ORFEntry-PrefixList (%u bytes)", entrylen);
+ subtree1 = proto_item_add_subtree(ti1, ett_bgp_orf_entry);
+ proto_tree_add_text(subtree1, tvb, p , 1, "ACTION: %s MATCH: %s",
+ val_to_str(entryflag&BGP_ORF_ACTION, orf_entry_action_vals,"UNKNOWN"),
+ val_to_str(entryflag&BGP_ORF_MATCH, orf_entry_match_vals,"UNKNOWN"));
+ p++;
+ proto_tree_add_text(subtree1, tvb, p , 4, "Entry Sequence No: %u", entryseq);
+ p += 4;
+ proto_tree_add_text(subtree1, tvb, p , 1, "PrefixMask length lower bound: %u", pfx_ge);
+ p++;
+ proto_tree_add_text(subtree1, tvb, p , 1, "PrefixMask length upper bound: %u", pfx_le);
+ p++;
+ proto_tree_add_text(subtree1, tvb, p , 1 + (pfx_masklen+7)/8, "Prefix: %s", pfxbuf);
+ p+= 1 + (pfx_masklen+7)/8;
+ }
+ }
+ }
+}
+
+/*
+ * Dissect a BGP CAPABILITY message.
+ */
+static void
+dissect_bgp_capability(tvbuff_t *tvb, int offset, proto_tree *tree)
+{
+ proto_item *ti;
+ proto_tree *subtree;
+ guint8 action;
+ int ctype;
+ int clen;
+ int mend;
+
+ mend = offset + tvb_get_ntohs(tvb, offset + BGP_MARKER_SIZE);
+ offset += BGP_HEADER_SIZE;
+ /* step through all of the capabilities */
+ while (offset < mend) {
+ action = tvb_get_guint8(tvb, offset++);
+ ctype = tvb_get_guint8(tvb, offset++);
+ clen = tvb_get_guint8(tvb, offset++);
+
+ ti = proto_tree_add_text(tree, tvb, offset - 2, 2 + clen,
+ "%s (%u %s)", val_to_str(ctype, capability_vals,
+ "Unknown capability"), 2 + clen, (clen == 1) ? "byte" : "bytes");
+ subtree = proto_item_add_subtree(ti, ett_bgp_option);
+ proto_tree_add_text(subtree, tvb, offset-2, 1, "Action: %d (%s)",
+ action, val_to_str(action, bgpcap_action, "Invalid action value"));
+ dissect_bgp_capability_item(tvb, &offset, subtree, ctype, clen);
+ }
}
+
/*
* Dissect a BGP packet.
*/
proto_tree *bgp1_tree; /* BGP message tree */
int l, i; /* tmp */
int found; /* number of BGP messages in packet */
- static u_char marker[] = { /* BGP message marker */
+ static guchar marker[] = { /* BGP message marker */
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
};
- struct bgp bgp; /* BGP header */
- int hlen; /* BGP header length */
- char *typ; /* BGP message type */
+ guint8 bgp_marker[BGP_MARKER_SIZE]; /* Marker (should be all ones */
+ guint16 bgp_len; /* Message length */
+ guint8 bgp_type; /* Message type */
- pinfo->current_proto = "BGP";
- if (check_col(pinfo->fd, COL_PROTOCOL))
- col_set_str(pinfo->fd, COL_PROTOCOL, "BGP");
- if (check_col(pinfo->fd, COL_INFO))
- col_clear(pinfo->fd, COL_INFO);
+ char *typ; /* Message type (string) */
- l = tvb_length(tvb);
+ if (check_col(pinfo->cinfo, COL_PROTOCOL))
+ col_set_str(pinfo->cinfo, COL_PROTOCOL, "BGP");
+ if (check_col(pinfo->cinfo, COL_INFO))
+ col_clear(pinfo->cinfo, COL_INFO);
+
+ l = tvb_reported_length(tvb);
i = 0;
found = -1;
/* run through the TCP packet looking for BGP headers */
- /* this is done twice, but this way each message type can be
- printed in the COL_INFO field */
while (i + BGP_HEADER_SIZE <= l) {
- tvb_memcpy(tvb, bgp.bgp_marker, i, BGP_HEADER_SIZE);
+ tvb_memcpy(tvb, bgp_marker, i, BGP_MARKER_SIZE);
+ bgp_len = tvb_get_ntohs(tvb, i + BGP_MARKER_SIZE);
+ bgp_type = tvb_get_guint8(tvb, i + BGP_MARKER_SIZE + 2);
/* look for bgp header */
- if (memcmp(bgp.bgp_marker, marker, sizeof(marker)) != 0) {
+ if (memcmp(bgp_marker, marker, sizeof(marker)) != 0) {
i++;
continue;
}
found++;
- hlen = ntohs(bgp.bgp_len);
- typ = val_to_str(bgp.bgp_type, bgptypevals, "Unknown Message");
- if (check_col(pinfo->fd, COL_INFO)) {
- if (found == 0)
- col_add_fstr(pinfo->fd, COL_INFO, "%s", typ);
- else
- col_append_fstr(pinfo->fd, COL_INFO, ", %s", typ);
+ /*
+ * Desegmentation check.
+ */
+ if (bgp_desegment) {
+ if (bgp_len > tvb_length_remaining(tvb, i) && pinfo->can_desegment) {
+ /*
+ * Not all of this packet is in the data we've been
+ * handed, but we can do reassembly on it.
+ *
+ * Tell the TCP dissector where the data for
+ * this message starts in the data it handed
+ * us, and how many more bytes we need, and
+ * return.
+ */
+ pinfo->desegment_offset = i;
+ pinfo->desegment_len = bgp_len - tvb_length_remaining(tvb, i);
+ return;
+ }
}
- i += hlen;
- }
+ typ = val_to_str(bgp_type, bgptypevals, "Unknown Message");
- if (tree) {
- ti = proto_tree_add_item(tree, proto_bgp, tvb, 0,
- l, FALSE);
- bgp_tree = proto_item_add_subtree(ti, ett_bgp);
+ if (check_col(pinfo->cinfo, COL_INFO)) {
+ if (found == 0)
+ col_add_fstr(pinfo->cinfo, COL_INFO, "%s", typ);
+ else
+ col_append_fstr(pinfo->cinfo, COL_INFO, ", %s", typ);
+ }
- i = 0;
- /* now, run through the TCP packet again, this time dissect */
- /* each message that we find */
- while (i + BGP_HEADER_SIZE <= l) {
- tvb_memcpy(tvb, bgp.bgp_marker, i, BGP_HEADER_SIZE);
+ if (tree) {
+ ti = proto_tree_add_item(tree, proto_bgp, tvb, i, bgp_len, FALSE);
+ bgp_tree = proto_item_add_subtree(ti, ett_bgp);
- /* look for bgp header */
- if (memcmp(bgp.bgp_marker, marker, sizeof(marker)) != 0) {
- i++;
- continue;
- }
+ ti = proto_tree_add_text(bgp_tree, tvb, i, bgp_len, "%s", typ);
- hlen = ntohs(bgp.bgp_len);
- typ = val_to_str(bgp.bgp_type, bgptypevals, "Unknown Message");
- if (l < hlen) {
- ti = proto_tree_add_text(bgp_tree, tvb, i,
- l, "%s (truncated)", typ);
- } else {
- ti = proto_tree_add_text(bgp_tree, tvb, i, hlen,
- "%s", typ);
- }
/* add a different tree for each message type */
- switch (bgp.bgp_type) {
+ switch (bgp_type) {
case BGP_OPEN:
bgp1_tree = proto_item_add_subtree(ti, ett_bgp_open);
break;
case BGP_KEEPALIVE:
bgp1_tree = proto_item_add_subtree(ti, ett_bgp);
break;
+ case BGP_ROUTE_REFRESH_CISCO:
case BGP_ROUTE_REFRESH:
bgp1_tree = proto_item_add_subtree(ti, ett_bgp_route_refresh);
break;
+ case BGP_CAPABILITY:
+ bgp1_tree = proto_item_add_subtree(ti, ett_bgp_capability);
+ break;
default:
bgp1_tree = proto_item_add_subtree(ti, ett_bgp);
break;
proto_tree_add_text(bgp1_tree, tvb, i, BGP_MARKER_SIZE,
"Marker: 16 bytes");
-
- if (hlen < BGP_HEADER_SIZE || hlen > BGP_MAX_PACKET_SIZE) {
+
+ if (bgp_len < BGP_HEADER_SIZE || bgp_len > BGP_MAX_PACKET_SIZE) {
proto_tree_add_text(bgp1_tree, tvb,
- i + offsetof(struct bgp, bgp_len), 2,
- "Length (invalid): %u %s", hlen,
- (hlen == 1) ? "byte" : "bytes");
+ i + BGP_MARKER_SIZE, 2,
+ "Length (invalid): %u %s", bgp_len,
+ (bgp_len == 1) ? "byte" : "bytes");
+ return;
} else {
proto_tree_add_text(bgp1_tree, tvb,
- i + offsetof(struct bgp, bgp_len), 2,
- "Length: %u %s", hlen,
- (hlen == 1) ? "byte" : "bytes");
+ i + BGP_MARKER_SIZE, 2,
+ "Length: %u %s", bgp_len,
+ (bgp_len == 1) ? "byte" : "bytes");
}
- proto_tree_add_uint_format(bgp1_tree, hf_bgp_type, tvb,
- i + offsetof(struct bgp, bgp_type), 1,
- bgp.bgp_type,
- "Type: %s (%u)", typ, bgp.bgp_type);
+ proto_tree_add_uint_format(bgp1_tree, hf_bgp_type, tvb,
+ i + BGP_MARKER_SIZE + 2, 1,
+ bgp_type,
+ "Type: %s (%u)", typ, bgp_type);
- switch (bgp.bgp_type) {
+ switch (bgp_type) {
case BGP_OPEN:
dissect_bgp_open(tvb, i, bgp1_tree);
break;
case BGP_KEEPALIVE:
/* no data in KEEPALIVE messages */
break;
+ case BGP_ROUTE_REFRESH_CISCO:
case BGP_ROUTE_REFRESH:
dissect_bgp_route_refresh(tvb, i, bgp1_tree);
break;
+ case BGP_CAPABILITY:
+ dissect_bgp_capability(tvb, i, bgp1_tree);
+ break;
default:
break;
}
-
- i += hlen;
}
+
+ i += bgp_len;
}
}
static hf_register_info hf[] = {
{ &hf_bgp_type,
- { "BGP message type", "bgp.type", FT_UINT8, BASE_HEX,
- VALS(bgptypevals), 0x0, "BGP message type" }},
+ { "BGP message type", "bgp.type", FT_UINT8, BASE_HEX,
+ VALS(bgptypevals), 0x0, "BGP message type", HFILL }},
};
static gint *ett[] = {
&ett_bgp_attrs,
&ett_bgp_attr,
&ett_bgp_attr_flags,
+ &ett_bgp_mp_nhna,
&ett_bgp_mp_reach_nlri,
&ett_bgp_mp_unreach_nlri,
+ &ett_bgp_mp_snpa,
&ett_bgp_nlri,
&ett_bgp_open,
&ett_bgp_update,
&ett_bgp_notification,
&ett_bgp_route_refresh,
+ &ett_bgp_capability,
&ett_bgp_as_paths,
&ett_bgp_communities,
&ett_bgp_cluster_list,
&ett_bgp_options,
&ett_bgp_option,
+ &ett_bgp_extended_communities,
+ &ett_bgp_orf,
+ &ett_bgp_orf_entry
+ };
+ module_t *bgp_module;
+ static enum_val_t asn_len[] = {
+ {"Auto-detect", 0},
+ {"2 octet", 2},
+ {"4 octet", 4},
+ {NULL, -1}
};
proto_bgp = proto_register_protocol("Border Gateway Protocol",
"BGP", "bgp");
proto_register_field_array(proto_bgp, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
+
+ bgp_module = prefs_register_protocol(proto_bgp, NULL);
+ prefs_register_bool_preference(bgp_module, "desegment",
+ "Desegment all BGP messages spanning multiple TCP segments",
+ "Whether the BGP dissector should desegment all messages spanning multiple TCP segments",
+ &bgp_desegment);
+ prefs_register_enum_preference(bgp_module, "asn_len",
+ "Length of the AS number",
+ "BGP dissector detect the length of the AS number in AS_PATH attributes automatically or manually (NOTE: Automatic detection is not 100% accurate)",
+ &bgp_asn_len, asn_len, FALSE);
}
void
proto_reg_handoff_bgp(void)
{
- dissector_add("tcp.port", BGP_TCP_PORT, dissect_bgp, proto_bgp);
+ dissector_handle_t bgp_handle;
+
+ bgp_handle = create_dissector_handle(dissect_bgp, proto_bgp);
+ dissector_add("tcp.port", BGP_TCP_PORT, bgp_handle);
}
git.samba.org / obnox / wireshark / wip.git / blobdiff