Ethereal-dev: [Ethereal-dev] v6 BGP MPLS VPN support
Note: This archive is from the project's previous web site, ethereal.com. This list is no longer active.
From: Hannes Gredler <hannes@xxxxxxxxxxx>
Date: Sun, 3 Nov 2002 23:40:17 +0100
hi ethereal developers, pls find attach a patch that supports dissecting of v6 VPN NLRIs it also fixes a little bug for displaying v4 nexthops using type 1 RD style [dissecting started at wrong offset]; /hannes
Index: packet-bgp.c
===================================================================
RCS file: /cvsroot/ethereal/packet-bgp.c,v
retrieving revision 1.71
diff -u -r1.71 packet-bgp.c
--- packet-bgp.c 2002/10/15 17:19:06 1.71
+++ packet-bgp.c 2002/11/03 22:30:36
@@ -398,7 +398,7 @@
case SAFNUM_UNIMULC:
case SAFNUM_MPLS_LABEL:
length = 4 ;
- tvb_memcpy(tvb, ip4addr, offset, 4);
+ tvb_memcpy(tvb, ip4addr, offset, sizeof(ip4addr));
snprintf(buf, buflen, "%s", ip_to_str(ip4addr));
break;
case SAFNUM_LAB_VPNUNICAST:
@@ -407,17 +407,17 @@
rd_type=tvb_get_ntohs(tvb,offset) ;
switch (rd_type) {
case FORMAT_AS2_LOC:
- length = 12;
- tvb_memcpy(tvb, ip4addr, offset + 8, 4);
+ 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 = 12;
- tvb_memcpy(tvb, ip4addr, offset + 2, 4); /* IP part of the RD */
- tvb_memcpy(tvb, ip4addr2, offset +6, 4); /* IP address of the VPN */
+ 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),
@@ -437,13 +437,41 @@
break;
case AFNUM_INET6:
switch (safi) {
- case SAFNUM_UNICAST: /* only decode unlabeled prefixes */
+ case SAFNUM_UNICAST:
case SAFNUM_MULCAST:
case SAFNUM_UNIMULC:
length = 16 ;
- tvb_memcpy(tvb, ip6addr.u6_addr.u6_addr8,offset, sizeof(ip6addr));
+ 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);
@@ -485,6 +513,7 @@
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 */
@@ -597,6 +626,71 @@
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);
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