[PATCH] [IPv4] Add strict check for replying net unreachable message

[Mitsuru Chinen <mitch@linux.vnet.ibm.com>]

The patch `Reply net unreachable ICMP message' had a bug.
A route whose type is blockhole or prohibit type is treated as
unreachable type. The case where err is set to ENETUNREACH should
be that no route is found in the routing table only.

Signed-off-by: Mitsuru Chinen <mitch@linux.vnet.ibm.com>
---
 net/ipv4/route.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index 8a79f74..d2bc614 100644
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -1882,7 +1882,8 @@ no_route:
 	RT_CACHE_STAT_INC(in_no_route);
 	spec_dst = inet_select_addr(dev, 0, RT_SCOPE_UNIVERSE);
 	res.type = RTN_UNREACHABLE;
-	err = -ENETUNREACH;
+	if (err == -ESRCH)
+		err = -ENETUNREACH;
 	goto local_input;
 
 	/*
-- 
1.5.3.4