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Real parsing of BGP OPEN options including capability

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negotiation.
This commit is contained in:
Martin Mares 2000-04-25 13:32:17 +00:00
parent 8b258e4e65
commit a47a01083b
1 changed files with 40 additions and 2 deletions
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42
proto/bgp/packets.c
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@ -199,6 +199,44 @@ bgp_tx(sock *sk)
;
}
static int
bgp_parse_options(struct bgp_conn *conn, byte *opt, int len)
{
while (len > 0)
{
if (len < 2 || len < 2 + opt[1])
{ bgp_error(conn, 2, 0, 0, 0); return 0; }
#ifdef LOCAL_DEBUG
{
int i;
DBG("\tOption %02x:", opt[0]);
for(i=0; i<opt[1]; i++)
DBG(" %02x", opt[2+i]);
DBG("\n");
}
#endif
switch (opt[0])
{
case 2:
/* Defined in draft-ietf-idr-bgp4-cap-neg-06 */
/* We can safely ignore all capabilities */
break;
default:
/*
* BGP specs don't tell us to send which option
* we didn't recognize, but it's common practice
* to do so. Also, capability negotiation with
* Cisco routers doesn't work without that.
*/
bgp_error(conn, 2, 4, opt[0], 1);
return 0;
}
len -= 2 + opt[1];
opt += 2 + opt[1];
}
return 0;
}
static void
bgp_rx_open(struct bgp_conn *conn, byte *pkt, int len)
{
@ -226,8 +264,8 @@ bgp_rx_open(struct bgp_conn *conn, byte *pkt, int len)
if (hold > 0 && hold < 3)
{ bgp_error(conn, 2, 6, hold, 0); return; }
p->remote_id = id;
if (pkt[28]) /* Currently we support no optional parameters */
{ bgp_error(conn, 2, 4, pkt[29], 0); return; }
if (bgp_parse_options(conn, pkt+29, pkt[28]))
return;
if (!id || id == 0xffffffff || id == p->local_id)
{ bgp_error(conn, 2, 3, id, 0); return; }