[PATCH 3.16.y-ckt 004/168] ipv4: Fix incorrect error code when adding an unreachable route

From: Luis Henriques
Date: Mon Dec 15 2014 - 09:27:25 EST

3.16.7-ckt3 -stable review patch. If anyone has any objections, please let me know.


From: Panu Matilainen <pmatilai@xxxxxxxxxx>

commit 49dd18ba4615eaa72f15c9087dea1c2ab4744cf5 upstream.

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

[root@localhost ~]# ip route add dev eth0 via
RTNETLINK answers: Network is unreachable
[root@localhost ~]# ip rule add to table 200
[root@localhost ~]# ip route add dev eth0 via
RTNETLINK answers: No such process
[root@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@xxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Luis Henriques <luis.henriques@xxxxxxxxxxxxx>
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 f2e15738534d..8f7bd56955b0 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)
res->tclassid = 0;
+ if (err == -ESRCH)
return err;

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