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handle IPv6 router alert option contained in an incoming packet per

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option value so that unrecognized options are ignored as specified in RFC2711.
(packets containing an MLD router alert option are passed to the upper layer
as before).

Approved by: gnn (mentor), ume (mentor)
This commit is contained in:
jinmei 2007-05-14 17:56:13 +00:00
parent 7ce35c288a
commit 3b02a8ea6a
1 changed files with 18 additions and 4 deletions
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22
sys/netinet6/ip6_input.c
View File

@ -657,11 +657,25 @@ ip6_input(m)
nxt = hbh->ip6h_nxt;
/*
* accept the packet if a router alert option is included
* and we act as an IPv6 router.
* If we are acting as a router and the packet contains a
* router alert option, see if we know the option value.
* Currently, we only support the option value for MLD, in which
* case we should pass the packet to the multicast routing
* daemon.
*/
if (rtalert != ~0 && ip6_forwarding)
ours = 1;
if (rtalert != ~0 && ip6_forwarding) {
switch (rtalert) {
case IP6OPT_RTALERT_MLD:
ours = 1;
break;
default:
/*
* RFC2711 requires unrecognized values must be
* silently ignored.
*/
break;
}
}
} else
nxt = ip6->ip6_nxt;