[PATCH 3.13.y-ckt 30/96] ipv4: Fix incorrect error code when adding an unreachable route

[Kamal Mostafa]

3.13.11-ckt13 -stable review patch.  If anyone has any objections, please let me know.

------------------

From: Panu Matilainen <pmatilai at redhat.com>

[ Upstream commit 49dd18ba4615eaa72f15c9087dea1c2ab4744cf5 ]

Trying to add an unreachable route incorrectly returns -ESRCH if
if custom FIB rules are present:

[root at localhost ~]# ip route add 74.125.31.199 dev eth0 via 1.2.3.4
RTNETLINK answers: Network is unreachable
[root at localhost ~]# ip rule add to 55.66.77.88 table 200
[root at localhost ~]# ip route add 74.125.31.199 dev eth0 via 1.2.3.4
RTNETLINK answers: No such process
[root at localhost ~]#

Commit 83886b6b636173b206f475929e58fac75c6f2446 ("[NET]: Change "not found"
return value for rule lookup") changed fib_rules_lookup()
to use -ESRCH as a "not found" code internally, but for user space it
should be translated into -ENETUNREACH. Handle the translation centrally in
ipv4-specific fib_lookup(), leaving the DECnet case alone.

On a related note, commit b7a71b51ee37d919e4098cd961d59a883fd272d8
("ipv4: removed redundant conditional") removed a similar translation from
ip_route_input_slow() prematurely AIUI.

Fixes: b7a71b51ee37 ("ipv4: removed redundant conditional")
Signed-off-by: Panu Matilainen <pmatilai at redhat.com>
Signed-off-by: David S. Miller <davem at davemloft.net>
Signed-off-by: Kamal Mostafa <kamal at canonical.com>
---
 net/ipv4/fib_rules.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/net/ipv4/fib_rules.c b/net/ipv4/fib_rules.c
index f2e1573..8f7bd56 100644
--- a/net/ipv4/fib_rules.c
+++ b/net/ipv4/fib_rules.c
@@ -62,6 +62,10 @@ int __fib_lookup(struct net *net, struct flowi4 *flp, struct fib_result *res)
 	else
 		res->tclassid = 0;
 #endif
+
+	if (err == -ESRCH)
+		err = -ENETUNREACH;
+
 	return err;
 }
 EXPORT_SYMBOL_GPL(__fib_lookup);
-- 
1.9.1