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From Hannes Gredler: 

Basic support for AFI & Extd communities in
	    draft-kompella-ppvpn-l2vpn

	More robust handling for unknown AFIs in BGP MP(UN)REACH NLRIs

Fix typos.

svn path=/trunk/; revision=6079
This commit is contained in:
Guy Harris 2002-08-24 10:22:29 +00:00
parent 1e1bbe5215
commit 210b46429b
5 changed files with 220 additions and 173 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
AUTHORS
View File

@ -692,6 +692,9 @@ Hannes Gredler <hannes[AT]juniper.net> {
Fix display of OSI system IDs to use a dot rather than a dash
before the PSN byte
Fix display of one-byte NETs in ISIS dissector
Basic support for AFI & Extd communities in
draft-kompella-ppvpn-l2vpn
More robust handling for unknown AFIs in BGP MP(UN)REACH NLRIs
}
Inoue <inoue[AT]ainet.or.jp> {

3
afn.c
View File

@ -1,7 +1,7 @@
/* afn.c
* RFC 1700 address family numbers
*
* $Id: afn.c,v 1.2 2002/01/21 07:36:31 guy Exp $
* $Id: afn.c,v 1.3 2002/08/24 10:22:29 guy Exp $
*
* Ethereal - Network traffic analyzer
* By Gerald Combs <gerald@ethereal.com>
@ -46,6 +46,7 @@ const value_string afn_vals[] = {
{ AFNUM_DECNET, "Decnet IV" },
{ AFNUM_BANYAN, "Banyan Vines" },
{ AFNUM_E164NSAP, "E.164 with NSAP subaddress" },
{ AFNUM_L2VPN, "Layer-2 VPN" },
{ 65535, "Reserved" },
{ 0, NULL },
};

5
afn.h
View File

@ -1,7 +1,7 @@
/* afn.h
* RFC 1700 address family numbers
*
* $Id: afn.h,v 1.1 2001/07/21 10:27:12 guy Exp $
* $Id: afn.h,v 1.2 2002/08/24 10:22:29 guy Exp $
*
* Ethereal - Network traffic analyzer
* By Gerald Combs <gerald@ethereal.com>
@ -41,7 +41,8 @@
#define AFNUM_DECNET 13
#define AFNUM_BANYAN 14
#define AFNUM_E164NSAP 15
/* draft-kompella-ppvpn-l2vpn */
#define AFNUM_L2VPN 196
extern const value_string afn_vals[];
#endif /* __AFN_H__ */

375
packet-bgp.c
View File

@ -2,7 +2,7 @@
* Routines for BGP packet dissection.
* Copyright 1999, Jun-ichiro itojun Hagino <itojun@itojun.org>
*
* $Id: packet-bgp.c,v 1.62 2002/08/15 18:52:04 guy Exp $
* $Id: packet-bgp.c,v 1.63 2002/08/24 10:22:29 guy Exp $
*
* Supports:
* RFC1771 A Border Gateway Protocol 4 (BGP-4)
@ -160,9 +160,28 @@ static const value_string bgpext_com_type[] = {
{ 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 },
};
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" },
@ -184,7 +203,9 @@ static const value_string bgpattr_nlri_safi[] = {
{ SAFNUM_MULCAST, "Multicast" },
{ SAFNUM_UNIMULC, "Unicast+Multicast" },
{ SAFNUM_MPLS_LABEL, "MPLS Labeled Prefix"},
{ SAFNUM_LBVPNIP, "Labeled VPN-IPv4" }, /* draft-rosen-rfc2547bis-03 */
{ SAFNUM_LAB_VPNUNICAST, "Labeled Unicast" }, /* draft-rosen-rfc2547bis-03 */
{ SAFNUM_LAB_VPNMULCAST, "Labeled Multicast" },
{ SAFNUM_LAB_VPNUNIMULC, "Labeled Unicast+Multicast" },
{ 0, NULL },
};
@ -378,7 +399,9 @@ mp_addr_to_str (guint16 afi, guint8 safi, tvbuff_t *tvb, gint offset, char *buf,
tvb_memcpy(tvb, ip4addr, offset, 4);
snprintf(buf, buflen, "%s", ip_to_str(ip4addr));
break;
case SAFNUM_LBVPNIP:
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:
@ -406,7 +429,7 @@ mp_addr_to_str (guint16 afi, guint8 safi, tvbuff_t *tvb, gint offset, char *buf,
break;
default:
length = 0 ;
snprintf(buf, buflen, "Unknown SAFI value for AFI %u", afi);
snprintf(buf, buflen, "Unknown SAFI (%u) for AFI %u", safi, afi);
break;
}
break;
@ -417,7 +440,7 @@ mp_addr_to_str (guint16 afi, guint8 safi, tvbuff_t *tvb, gint offset, char *buf,
break;
default:
length = 0 ;
snprintf(buf, buflen, "Unknown AFI value");
snprintf(buf, buflen, "Unknown AFI (%u) value", afi);
break;
}
return(length) ;
@ -470,7 +493,9 @@ decode_prefix_MP(guint16 afi, guint8 safi, tvbuff_t *tvb, gint offset, char *buf
length += (labnum*3) ;
break;
case SAFNUM_LBVPNIP:
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));
@ -526,13 +551,13 @@ decode_prefix_MP(guint16 afi, guint8 safi, tvbuff_t *tvb, gint offset, char *buf
break ;
default:
length = 0 ;
snprintf(buf,buflen, "Unkown labeled VPN-IPv4 address format");
snprintf(buf,buflen, "Unknown labeled VPN address format");
break;
}
break;
default:
length = 0 ;
snprintf(buf,buflen, "Unkown SAFI value for AFI %u", afi);
snprintf(buf,buflen, "Unknown SAFI (%u) for AFI %u", safi, afi);
break;
}
break;
@ -541,7 +566,7 @@ decode_prefix_MP(guint16 afi, guint8 safi, tvbuff_t *tvb, gint offset, char *buf
break;
default:
length = 0 ;
snprintf(buf,buflen, "Unkown AFI value");
snprintf(buf,buflen, "Unknown AFI (%u) value", afi);
break;
}
return(1 + length) ;
@ -879,7 +904,7 @@ dissect_bgp_update(tvbuff_t *tvb, int offset, proto_tree *tree)
subtree = proto_item_add_subtree(ti, ett_bgp_attrs);
i = 2;
while (i < len) {
int alen, aoff;
int alen, tlen, aoff;
char *msg;
guint16 af;
guint8 saf;
@ -895,30 +920,31 @@ dissect_bgp_update(tvbuff_t *tvb, int offset, proto_tree *tree)
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
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 + aoff) =
(o + current attribute + aoff bytes to first tuple) */
q = o + i + aoff;
end = q + alen;
end = q + tlen;
/* must be freed by second switch! */
/* "alen * 6" (5 digits + space) should be a good estimate
/* "tlen * 6" (5 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) * 6);
if (as_path_str == NULL) break;
as_path_str[0] = '\0';
@ -961,75 +987,75 @@ dissect_bgp_update(tvbuff_t *tvb, int offset, proto_tree *tree)
}
/* 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)
goto default_attribute_top;
tvb_memcpy(tvb, ipaddr, o + i + aoff + 2, 4);
ti = proto_tree_add_text(subtree, tvb, o + i, alen + aoff,
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");
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 + aoff) =
(o + current attribute + aoff bytes to first tuple) */
q = o + i + aoff;
end = q + alen;
end = q + tlen;
/* must be freed by second switch! */
/* "alen * 12" (5 digits, a :, 5 digits + space ) should be
/* "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));
@ -1055,35 +1081,35 @@ dissect_bgp_update(tvbuff_t *tvb, int offset, proto_tree *tree)
/* 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 + aoff) =
(o + current attribute + aoff bytes to first tuple) */
q = o + i + aoff;
end = q + alen;
end = q + tlen;
/* must be freed by second switch! */
/* "alen * 16" (12 digits, 3 dots + space ) should be
/* "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));
@ -1098,21 +1124,21 @@ dissect_bgp_update(tvbuff_t *tvb, int offset, proto_tree *tree)
/* 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 (alen %8 != 0)
goto default_attribute_top;
if (tlen %8 != 0)
break;
/* (o + i + aoff) =
(o + current attribute + aoff bytes to first tuple) */
q = o + i + aoff;
end = q + alen;
ext_com_str = malloc((alen / 8)*MAX_SIZE_OF_EXT_COM_NAMES);
end = q + tlen;
ext_com_str = malloc((tlen / 8)*MAX_SIZE_OF_EXT_COM_NAMES);
if (ext_com_str == NULL) break;
ext_com_str[0] = '\0';
while (q < end) {
@ -1122,20 +1148,20 @@ dissect_bgp_update(tvbuff_t *tvb, int offset, proto_tree *tree)
q = q + 8;
if (q < end) strncat(ext_com_str, ",", 1);
}
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"),
ext_com_str, alen + aoff,
(alen + aoff == 1) ? "byte" : "bytes");
ext_com_str, tlen + aoff,
(tlen + aoff == 1) ? "byte" : "bytes");
free(ext_com_str);
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);
@ -1197,17 +1223,17 @@ dissect_bgp_update(tvbuff_t *tvb, int offset, proto_tree *tree)
bgpa.bgpa_type);
proto_tree_add_text(subtree2, tvb, o + i + sizeof(bgpa),
aoff - sizeof(bgpa), "Length: %d %s", alen,
(alen == 1) ? "byte" : "bytes");
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,
@ -1216,19 +1242,19 @@ dissect_bgp_update(tvbuff_t *tvb, int offset, proto_tree *tree)
break;
case BGPTYPE_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 + aoff) =
(o + current attribute + aoff bytes to first tuple) */
q = o + i + aoff;
end = q + alen;
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
@ -1300,49 +1326,49 @@ dissect_bgp_update(tvbuff_t *tvb, int offset, proto_tree *tree)
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");
if (tlen != 6) {
proto_tree_add_text(subtree2, tvb, o + i + aoff, tlen,
"Aggregator (invalid): %u %s", tlen,
(tlen == 1) ? "byte" : "bytes");
} else {
proto_tree_add_text(subtree2, tvb, o + i + aoff, 2,
"Aggregator AS: %u", tvb_get_ntohs(tvb, o + i + aoff));
@ -1353,15 +1379,15 @@ dissect_bgp_update(tvbuff_t *tvb, int offset, proto_tree *tree)
}
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,
ett_bgp_communities);
@ -1369,7 +1395,7 @@ dissect_bgp_update(tvbuff_t *tvb, int offset, proto_tree *tree)
/* (o + i + aoff) =
(o + current attribute + aoff bytes to first tuple) */
q = o + i + aoff;
end = q + alen;
end = q + tlen;
/* snarf each community */
while (q < end) {
@ -1401,13 +1427,13 @@ dissect_bgp_update(tvbuff_t *tvb, int offset, proto_tree *tree)
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));
}
@ -1434,6 +1460,8 @@ dissect_bgp_update(tvbuff_t *tvb, int offset, proto_tree *tree)
"Subsequent address family identifier: %s (%u)",
val_to_str(saf, bgpattr_nlri_safi, saf >= 128 ? "Vendor specific" : "Unknown"),
saf);
if (af!=(AFNUM_INET||AFNUM_INET6))
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)",
@ -1443,13 +1471,15 @@ dissect_bgp_update(tvbuff_t *tvb, int offset, proto_tree *tree)
while (j < nexthop_len) {
advance = mp_addr_to_str(af, saf, tvb, o + i + aoff + 4 + j,
junk_buf, sizeof(junk_buf)) ;
if (advance) /* catch if this is a unknown AFI type*/
break;
if (j + advance > nexthop_len)
break;
proto_tree_add_text(subtree3, tvb,o + i + aoff + 4 + j,
advance, "Next hop: %s (%u)", junk_buf, advance);
j += advance;
}
alen -= nexthop_len + 4;
tlen -= nexthop_len + 4;
aoff += nexthop_len + 4 ;
off = 0;
@ -1470,19 +1500,19 @@ dissect_bgp_update(tvbuff_t *tvb, int offset, proto_tree *tree)
off += tvb_get_guint8(tvb, o + i + aoff + off - 1);
}
}
alen -= off;
tlen -= off;
aoff += off;
ti = proto_tree_add_text(subtree2, tvb, o + i + aoff, alen,
ti = proto_tree_add_text(subtree2, tvb, o + i + aoff, tlen,
"Network layer reachability information (%u %s)",
alen, (alen == 1) ? "byte" : "bytes");
if (alen) {
tlen, (tlen == 1) ? "byte" : "bytes");
if (tlen) {
subtree3 = proto_item_add_subtree(ti,ett_bgp_mp_reach_nlri);
while (alen > 0) {
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) ;
alen -= advance;
tlen -= advance;
aoff += advance;
}
}
@ -1498,33 +1528,34 @@ dissect_bgp_update(tvbuff_t *tvb, int offset, proto_tree *tree)
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) {
if (tlen > 0) {
subtree3 = proto_item_add_subtree(ti,ett_bgp_mp_unreach_nlri);
while (alen > 0) {
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) ;
alen -= advance;
if (advance==1) /* catch if this is a unknown AFI type*/
break;
tlen -= advance;
aoff += advance;
}
}
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,
ett_bgp_cluster_list);
@ -1532,7 +1563,7 @@ dissect_bgp_update(tvbuff_t *tvb, int offset, proto_tree *tree)
/* (o + i + aoff) =
(o + current attribute + aoff bytes to first tuple) */
q = o + i + aoff;
end = q + alen;
end = q + tlen;
/* snarf each cluster identifier */
while (q < end) {
@ -1547,55 +1578,63 @@ dissect_bgp_update(tvbuff_t *tvb, int offset, proto_tree *tree)
free(cluster_list_str);
break;
case BGPTYPE_EXTENDED_COMMUNITY:
if (alen %8 != 0) {
proto_tree_add_text(subtree3, tvb, o + i + aoff, alen, "Extended community (invalid) : %u %s", alen,
(alen == 1) ? "byte" : "bytes") ;
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 + alen ;
end = o + i + aoff + tlen ;
ext_com_str = malloc(MAX_SIZE_OF_EXT_COM_NAMES+MAX_SIZE_OF_IP_ADDR_STRING*2+1) ;
if (ext_com_str == NULL) break ;
ti = proto_tree_add_text(subtree2,tvb,q,alen, "Carried Extended communities");
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) {
ext_com_str[0] = '\0' ;
ext_com = tvb_get_ntohs(tvb,q) ;
snprintf(junk_buf, sizeof(junk_buf), "%s", val_to_str(ext_com,bgpext_com_type,"Unknown"));
strncat(ext_com_str,junk_buf,sizeof(junk_buf));
switch (ext_com) {
case BGP_EXT_COM_RT_0:
case BGP_EXT_COM_RO_0:
snprintf(junk_buf, sizeof(junk_buf), ": %u%s%d",tvb_get_ntohs(tvb,q+2),":",tvb_get_ntohl(tvb,q+4));
break ;
case BGP_EXT_COM_RT_1:
case BGP_EXT_COM_RO_1:
tvb_memcpy(tvb,ipaddr,q+2,4);
snprintf(junk_buf, sizeof(junk_buf), ": %s%s%u",ip_to_str(ipaddr),":",tvb_get_ntohs(tvb,q+6));
break;
case BGP_EXT_COM_VPN_ORIGIN:
case BGP_EXT_COM_OSPF_RID:
tvb_memcpy(tvb,ipaddr,q+2,4);
snprintf(junk_buf, sizeof(junk_buf), ": %s",ip_to_str(ipaddr));
break;
case BGP_EXT_COM_OSPF_RTYPE:
tvb_memcpy(tvb,ipaddr,q+2,4);
snprintf(junk_buf, sizeof(junk_buf), ": Area:%s %s",ip_to_str(ipaddr),val_to_str(tvb_get_guint8(tvb,q+6),bgpext_ospf_rtype,"Unknown"));
ext_com_str[0] = '\0' ;
ext_com = tvb_get_ntohs(tvb,q) ;
snprintf(junk_buf, sizeof(junk_buf), "%s", val_to_str(ext_com,bgpext_com_type,"Unknown"));
strncat(ext_com_str,junk_buf,sizeof(junk_buf));
switch (ext_com) {
case BGP_EXT_COM_RT_0:
case BGP_EXT_COM_RO_0:
snprintf(junk_buf, sizeof(junk_buf), ": %u%s%d",tvb_get_ntohs(tvb,q+2),":",tvb_get_ntohl(tvb,q+4));
break ;
case BGP_EXT_COM_RT_1:
case BGP_EXT_COM_RO_1:
tvb_memcpy(tvb,ipaddr,q+2,4);
snprintf(junk_buf, sizeof(junk_buf), ": %s%s%u",ip_to_str(ipaddr),":",tvb_get_ntohs(tvb,q+6));
break;
case BGP_EXT_COM_VPN_ORIGIN:
case BGP_EXT_COM_OSPF_RID:
tvb_memcpy(tvb,ipaddr,q+2,4);
snprintf(junk_buf, sizeof(junk_buf), ": %s",ip_to_str(ipaddr));
break;
case BGP_EXT_COM_OSPF_RTYPE:
tvb_memcpy(tvb,ipaddr,q+2,4);
snprintf(junk_buf, sizeof(junk_buf), ": 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 ) {
strcat(junk_buf," E2");
} else if (tvb_get_guint8(tvb,q+6)==(BGP_OSPF_RTYPE_EXT ||BGP_OSPF_RTYPE_NSSA ) ) {
strcat(junk_buf, " E1");
}
break;
case BGP_EXT_COM_LINKBAND:
tvb_memcpy(tvb,ipaddr,q+2,4); /* need to check on IEEE format on all platforms */
snprintf(junk_buf, sizeof(junk_buf), ": %f bytes per second",(double)*ipaddr);
break;
default:
snprintf(junk_buf, sizeof(junk_buf), " ");
break ;
if ( (tvb_get_guint8(tvb,q+7)) & BGP_OSPF_RTYPE_METRIC_TYPE ) {
strcat(junk_buf," E2");
} else if (tvb_get_guint8(tvb,q+6)==(BGP_OSPF_RTYPE_EXT ||BGP_OSPF_RTYPE_NSSA ) ) {
strcat(junk_buf, " E1");
}
break;
case BGP_EXT_COM_LINKBAND:
tvb_memcpy(tvb,ipaddr,q+2,4); /* need to check on IEEE format on all platforms */
snprintf(junk_buf, sizeof(junk_buf), ": %f bytes per second",(double)*ipaddr);
break;
case BGP_EXT_COM_L2INFO:
snprintf(junk_buf, sizeof(junk_buf), ": %s:Control Flags [0x%02x]:MTU %u",
val_to_str(tvb_get_guint8(tvb,q+2),bgp_l2vpn_encaps,"Unknown"),
tvb_get_guint8(tvb,q+3),
tvb_get_ntohs(tvb,q+4));
break;
default:
snprintf(junk_buf, sizeof(junk_buf), " ");
break ;
}
strncat(ext_com_str,junk_buf,sizeof(junk_buf));
proto_tree_add_text(subtree3,tvb,q,8, "%s",ext_com_str);
@ -1605,8 +1644,8 @@ dissect_bgp_update(tvbuff_t *tvb, int offset, proto_tree *tree)
}
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 */

7
packet-bgp.h
View File

@ -1,7 +1,7 @@
/* packet-bgp.c
* Definitions for BGP packet disassembly structures and routine
*
* $Id: packet-bgp.h,v 1.18 2002/08/15 18:52:04 guy Exp $
* $Id: packet-bgp.h,v 1.19 2002/08/24 10:22:29 guy Exp $
*
* Ethereal - Network traffic analyzer
* By Gerald Combs <gerald@ethereal.com>
@ -166,6 +166,7 @@ struct bgp_attr {
/* draft-rosen-vpns-ospf-bgp-mpls */
#define BGP_EXT_COM_OSPF_RTYPE 0X8000 /* OSPF Route Type,Format Area(4B):RouteType(1B):Options(1B) */
#define BGP_EXT_COM_OSPF_RID 0x8001 /* OSPF Router ID,Format RouterID(4B):Unused(2B) */
#define BGP_EXT_COM_L2INFO 0x800a /* draft-kompella-ppvpn-l2vpn */
/* OSPF codes for BGP_EXT_COM_OSPF_RTYPE draft-rosen-vpns-ospf-bgp-mpls */
@ -187,7 +188,9 @@ struct bgp_attr {
#define SAFNUM_MULCAST 2
#define SAFNUM_UNIMULC 3
#define SAFNUM_MPLS_LABEL 4 /* rfc3107 */
#define SAFNUM_LBVPNIP 128 /* Draft-rosen-rfc2547bis-03 */
#define SAFNUM_LAB_VPNUNICAST 128 /* Draft-rosen-rfc2547bis-03 */
#define SAFNUM_LAB_VPNMULCAST 129
#define SAFNUM_LAB_VPNUNIMULC 130
#ifndef offsetof
#define offsetof(type, member) ((size_t)(&((type *)0)->member))