netdev - [PATCH] ipv6: do not create neighbor entries for local delivery

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Message-ID: <50F6ABCA.4020804@redhat.com>
Date:	Wed, 16 Jan 2013 11:31:54 -0200
From:	Marcelo Ricardo Leitner <mleitner@...hat.com>
To:	netdev <netdev@...r.kernel.org>
Subject: [PATCH] ipv6: do not create neighbor entries for local delivery

They will be created at output, if ever needed. This avoids creating
empty neighbor entries when TPROXYing/Forwarding packets for addresses
that are not even directly reachable.

Note that IPv4 already handles it this way. No neighbor entries are
created for local input.

Tested by myself and customer.

Signed-off-By: Marcelo Ricardo Leitner <mleitner@...hat.com>
---
  net/ipv6/route.c | 2 +-
  1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index 
7c34c01b515b7ac370f8021ba6f5ec4c654e9e41..b63e33bcbdfbc1bd78af0b98ffc2d211805214ea 
100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -921,7 +921,7 @@ restart:
  	dst_hold(&rt->dst);
  	read_unlock_bh(&table->tb6_lock);
-	if (!rt->n && !(rt->rt6i_flags & RTF_NONEXTHOP))
+	if (!rt->n && !(rt->rt6i_flags & (RTF_NONEXTHOP|RTF_LOCAL)))
  		nrt = rt6_alloc_cow(rt, &fl6->daddr, &fl6->saddr);
  	else if (!(rt->dst.flags & DST_HOST))
  		nrt = rt6_alloc_clone(rt, &fl6->daddr);
-- 
1.7.11.7


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