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 This list is no longer active.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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