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Skip the route checking in the case of multicast packets with known

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interfaces.

Reviewed by:	people at that channel
Approved by:	silence on -net
This commit is contained in:
Daniel C. Sobral 2001-07-17 18:47:48 +00:00
parent a3faabe42d
commit 3afefa3924
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=79830
1 changed files with 22 additions and 9 deletions
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31
sys/netinet/ip_output.c
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@ -252,15 +252,26 @@ ip_output(m0, opt, ro, flags, imo)
ifp = ia->ia_ifp;
ip->ip_ttl = 1;
isbroadcast = in_broadcast(dst->sin_addr, ifp);
} else if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr)) &&
(imo != NULL) &&
(imo->imo_multicast_ifp != NULL)) {
/*
* bypass the normal routing lookup for
* multicast packets if the interface is
* specified
*/
/* No Operation */
} else {
/*
* If this is the case, we probably don't want to allocate
* a protocol-cloned route since we didn't get one from the
* ULP. This lets TCP do its thing, while not burdening
* forwarding or ICMP with the overhead of cloning a route.
* Of course, we still want to do any cloning requested by
* the link layer, as this is probably required in all cases
* for correct operation (as it is for ARP).
* If this is the case, we probably don't want
* to allocate a protocol-cloned route since we
* didn't get one from the ULP. This lets TCP
* do its thing, while not burdening forwarding
* or ICMP with the overhead of cloning a route.
* Of course, we still want to do any cloning
* requested by the link layer, as this is
* probably required in all cases for correct
* operation (as it is for ARP).
*/
if (ro->ro_rt == 0)
rtalloc_ign(ro, RTF_PRCLONING);
@ -273,9 +284,11 @@ ip_output(m0, opt, ro, flags, imo)
ifp = ro->ro_rt->rt_ifp;
ro->ro_rt->rt_use++;
if (ro->ro_rt->rt_flags & RTF_GATEWAY)
dst = (struct sockaddr_in *)ro->ro_rt->rt_gateway;
dst = (struct sockaddr_in *)
ro->ro_rt->rt_gateway;
if (ro->ro_rt->rt_flags & RTF_HOST)
isbroadcast = (ro->ro_rt->rt_flags & RTF_BROADCAST);
isbroadcast = (ro->ro_rt->rt_flags &
RTF_BROADCAST);
else
isbroadcast = in_broadcast(dst->sin_addr, ifp);
}