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[IPV4] LVS: Allow to send ICMP unreachable responses when real-servers are removed

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this is a small patch by Janusz Krzysztofik to ip_route_output_slow()
that allows VIP-less LVS linux director to generate packets
originating >From VIP if sysctl_ip_nonlocal_bind is set.

In a nutshell, the intention is for an LVS linux director to be able
to send ICMP unreachable responses to end-users when real-servers are
removed.

http://archive.linuxvirtualserver.org/html/lvs-users/2007-01/msg00106.html

Signed-off-by: Simon Horman <horms@verge.net.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Janusz Krzysztofik 2007-03-26 18:03:44 -07:00 committed by David S. Miller
parent fa0b2d1d21
commit 2d771cd86d
1 changed files with 2 additions and 2 deletions
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4
net/ipv4/route.c
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@ -2396,7 +2396,7 @@ static int ip_route_output_slow(struct rtable **rp, const struct flowi *oldflp)
/* It is equivalent to inet_addr_type(saddr) == RTN_LOCAL */
dev_out = ip_dev_find(oldflp->fl4_src);
if (dev_out == NULL)
if ((dev_out == NULL) && !(sysctl_ip_nonlocal_bind))
goto out;
/* I removed check for oif == dev_out->oif here.
@ -2407,7 +2407,7 @@ static int ip_route_output_slow(struct rtable **rp, const struct flowi *oldflp)
of another iface. --ANK
*/
if (oldflp->oif == 0
if (dev_out && oldflp->oif == 0
&& (MULTICAST(oldflp->fl4_dst) || oldflp->fl4_dst == htonl(0xFFFFFFFF))) {
/* Special hack: user can direct multicasts
and limited broadcast via necessary interface