upport BGP multiprotocol extension (required for IPv6 BGP exchange).
svn path=/trunk/; revision=858
This commit is contained in:
Jun-ichiro itojun Hagino
parent
06f434844b
commit
a4e1535f19
223
packet-bgp.c
223
packet-bgp.c
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@ -2,7 +2,7 @@
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* Routines for BGP packet dissection
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* Copyright 1999, Jun-ichiro itojun Hagino <itojun@itojun.org>
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*
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* $Id: packet-bgp.c,v 1.2 1999/10/16 00:21:07 itojun Exp $
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* $Id: packet-bgp.c,v 1.3 1999/10/16 15:35:27 itojun Exp $
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*
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* Ethereal - Network traffic analyzer
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* By Gerald Combs <gerald@unicom.net>
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@ -38,9 +38,19 @@
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# include <netinet/in.h>
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#endif
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#ifdef NEED_SNPRINTF_H
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# ifdef HAVE_STDARG_H
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# include <stdarg.h>
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# else
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# include <varargs.h>
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# endif
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# include "snprintf.h"
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#endif
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#include <string.h>
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#include <glib.h>
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#include "packet.h"
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#include "packet-ipv6.h"
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struct bgp {
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guint8 bgp_marker[16];
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@ -174,12 +184,51 @@ static const value_string bgpattr_type[] = {
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/* Subsequent address family identifier, RFC2283 section 7 */
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static const value_string bgpattr_nlri_safi[] = {
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{ 0, "Reserved" },
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{ 1, "Unicast" },
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{ 2, "Multicast" },
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{ 3, "Unicast+Multicast" },
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{ 0, NULL },
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};
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/* RFC1700 address family numbers */
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#define AFNUM_INET 1
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#define AFNUM_INET6 2
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#define AFNUM_NSAP 3
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#define AFNUM_HDLC 4
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#define AFNUM_BBN1822 5
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#define AFNUM_802 6
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#define AFNUM_E163 7
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#define AFNUM_E164 8
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#define AFNUM_F69 9
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#define AFNUM_X121 10
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#define AFNUM_IPX 11
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#define AFNUM_ATALK 12
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#define AFNUM_DECNET 13
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#define AFNUM_BANYAN 14
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#define AFNUM_E164NSAP 15
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static const value_string afnumber[] = {
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{ 0, "Reserved" },
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{ AFNUM_INET, "IPv4" },
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{ AFNUM_INET6, "IPv6" },
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{ AFNUM_NSAP, "NSAP" },
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{ AFNUM_HDLC, "HDLC" },
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{ AFNUM_BBN1822, "BBN 1822" },
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{ AFNUM_802, "802" },
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{ AFNUM_E163, "E.163" },
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{ AFNUM_E164, "E.164" },
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{ AFNUM_F69, "F.69" },
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{ AFNUM_X121, "X.121" },
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{ AFNUM_IPX, "IPX" },
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{ AFNUM_ATALK, "Appletalk" },
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{ AFNUM_DECNET, "Decnet IV" },
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{ AFNUM_BANYAN, "Banyan Vines" },
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{ AFNUM_E164NSAP, "E.164 with NSAP subaddress" },
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{ 65535, "Reserved" },
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{ 0, NULL },
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};
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static int proto_bgp = -1;
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@ -187,6 +236,42 @@ static int proto_bgp = -1;
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#define offsetof(type, member) ((size_t)(&((type *)0)->member))
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#endif
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static int
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decode_prefix4(const u_char *pd, char *buf, int buflen)
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{
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guint8 addr[4];
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int plen;
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plen = pd[0];
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if (plen < 0 || 32 < plen)
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return -1;
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memset(addr, 0, sizeof(addr));
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memcpy(addr, &pd[1], (plen + 7) / 8);
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if (plen % 8)
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addr[(plen + 7) / 8 - 1] &= ((0xff00 >> (plen % 8)) & 0xff);
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snprintf(buf, buflen, "%s/%d", ip_to_str(addr), plen);
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return 1 + (plen + 7) / 8;
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}
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static int
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decode_prefix6(const u_char *pd, char *buf, int buflen)
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{
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struct e_in6_addr addr;
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int plen;
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plen = pd[0];
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if (plen < 0 || 128 < plen)
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return -1;
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memset(&addr, 0, sizeof(addr));
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memcpy(&addr, &pd[1], (plen + 7) / 8);
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if (plen % 8)
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addr.s6_addr[(plen + 7) / 8 - 1] &= ((0xff00 >> (plen % 8)) & 0xff);
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snprintf(buf, buflen, "%s/%d", ip6_to_str(&addr), plen);
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return 1 + (plen + 7) / 8;
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}
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static void
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dissect_bgp_open(const u_char *pd, int offset, frame_data *fd, proto_tree *tree)
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{
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@ -253,6 +338,8 @@ dissect_bgp_update(const u_char *pd, int offset, frame_data *fd,
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while (i < len) {
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int alen, aoff;
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char *msg;
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guint16 af;
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int off, snpa;
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memcpy(&bgpa, &p[i], sizeof(bgpa));
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if (bgpa.bgpa_flags & 0x10) {
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@ -393,6 +480,140 @@ dissect_bgp_update(const u_char *pd, int offset, frame_data *fd,
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"Aggregator origin: %s",
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ip_to_str(&p[i + aoff + 2]));
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}
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break;
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case BGPTYPE_MP_REACH_NLRI:
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af = ntohs(*(guint16 *)&p[i + aoff]);
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proto_tree_add_text(subtree2, p - pd + i + aoff, 2,
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"Address family: %s (%u)",
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val_to_str(af, afnumber, "Unknown"), af);
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proto_tree_add_text(subtree2, p - pd + i + aoff + 2, 1,
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"Subsequent address family identifier: %s (%u)",
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val_to_str(p[i + aoff + 2], bgpattr_nlri_safi,
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p[i + aoff + 2] >= 128 ? "Vendor specific" : "Unknown"),
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p[i + aoff + 2]);
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ti = proto_tree_add_text(subtree2, p - pd + i + aoff + 3, 1,
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"Next hop network address (%d bytes)",
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p[i + aoff + 3]);
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if (af == AFNUM_INET || af == AFNUM_INET6) {
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int j, advance;
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const char *s;
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subtree3 = proto_item_add_subtree(ti, ETT_BGP);
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j = 0;
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while (j < p[i + aoff + 3]) {
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if (af == AFNUM_INET)
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advance = 4;
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else if (af == AFNUM_INET6)
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advance = 16;
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else
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break;
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if (j + advance > p[i + aoff + 3])
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break;
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if (af == AFNUM_INET)
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s = ip_to_str(&p[i + aoff + 4 + j]);
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else {
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s = ip6_to_str((struct e_in6_addr *)
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&p[i + aoff + 4 + j]);
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}
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proto_tree_add_text(subtree3,
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p - pd + i + aoff + 4 + j, advance,
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"Next hop: %s", s);
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j += advance;
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}
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}
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alen -= (p[i + aoff + 3] + 4);
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aoff += (p[i + aoff + 3] + 4);
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off = 0;
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snpa = p[i + aoff];
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ti = proto_tree_add_text(subtree2, p - pd + i + aoff, 1,
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"Subnetwork points of attachment: %u", snpa);
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off++;
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if (snpa)
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subtree3 = proto_item_add_subtree(ti, ETT_BGP);
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for (/*nothing*/; snpa > 0; snpa--) {
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proto_tree_add_text(subtree3, p - pd + i + aoff + off, 1,
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"SNPA length: ", p[i + aoff + off]);
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off++;
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proto_tree_add_text(subtree3, p - pd + i + aoff + off,
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p[i + aoff + off - 1],
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"SNPA (%u bytes)", p[i + aoff + off - 1]);
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off += p[i + aoff + off - 1];
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}
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alen -= off;
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aoff += off;
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ti = proto_tree_add_text(subtree2, p - pd + i + aoff, alen,
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"Network Layer Reachability Information (%u bytes)",
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alen);
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if (alen)
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subtree3 = proto_item_add_subtree(ti, ETT_BGP);
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while (alen > 0) {
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int advance;
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char buf[256];
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if (af == AFNUM_INET) {
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advance = decode_prefix4(&p[i + aoff], buf,
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sizeof(buf));
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} else if (af == AFNUM_INET6) {
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advance = decode_prefix6(&p[i + aoff], buf,
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sizeof(buf));
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} else
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break;
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if (advance < 0)
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break;
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if (alen < advance)
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break;
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proto_tree_add_text(subtree3, p - pd + i + aoff, advance,
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"Network Layer Reachability Information: %s", buf);
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alen -= advance;
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aoff += advance;
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}
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break;
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case BGPTYPE_MP_UNREACH_NLRI:
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af = ntohs(*(guint16 *)&p[i + aoff]);
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proto_tree_add_text(subtree2, p - pd + i + aoff, 2,
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"Address family: %s (%u)",
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val_to_str(af, afnumber, "Unknown"), af);
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proto_tree_add_text(subtree2, p - pd + i + aoff + 2, 1,
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"Subsequent address family identifier: %s (%u)",
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val_to_str(p[i + aoff + 2], bgpattr_nlri_safi,
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p[i + aoff + 2] >= 128 ? "Vendor specific" : "Unknown"),
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p[i + aoff + 2]);
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ti = proto_tree_add_text(subtree2, p - pd + i + aoff + 3,
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alen - 3, "Withdrawn Routes (%u bytes)", alen - 3);
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alen -= 3;
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aoff += 3;
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if (alen > 0)
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subtree3 = proto_item_add_subtree(ti, ETT_BGP);
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while (alen > 0) {
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int advance;
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char buf[256];
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if (af == AFNUM_INET) {
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advance = decode_prefix4(&p[i + aoff], buf,
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sizeof(buf));
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} else if (af == AFNUM_INET6) {
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advance = decode_prefix6(&p[i + aoff], buf,
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sizeof(buf));
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} else
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break;
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if (advance < 0)
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break;
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if (alen < advance)
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break;
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proto_tree_add_text(subtree3, p - pd + i + aoff, advance,
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"Withdrawn route: %s", buf);
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alen -= advance;
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aoff += advance;
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}
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break;
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default:
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proto_tree_add_text(subtree2, p - pd + i + aoff, alen,
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