linux-kernel - [PATCH 3.13.y-ckt 153/156] ipv6: fix backtracking for throw routes

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Message-Id: <1428447093-3282-154-git-send-email-kamal@canonical.com>
Date:	Tue,  7 Apr 2015 15:51:30 -0700
From:	Kamal Mostafa <kamal@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Steven Barth <cyrus@...nwrt.org>,
	"David S. Miller" <davem@...emloft.net>,
	Kamal Mostafa <kamal@...onical.com>
Subject: [PATCH 3.13.y-ckt 153/156] ipv6: fix backtracking for throw routes

3.13.11-ckt19 -stable review patch.  If anyone has any objections, please let me know.

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

From: Steven Barth <cyrus@...nwrt.org>

[ Upstream commit 73ba57bfae4a1914f6a6dac71e3168dd900e00af ]

for throw routes to trigger evaluation of other policy rules
EAGAIN needs to be propagated up to fib_rules_lookup
similar to how its done for IPv4

A simple testcase for verification is:

ip -6 rule add lookup 33333 priority 33333
ip -6 route add throw 2001:db8::1
ip -6 route add 2001:db8::1 via fe80::1 dev wlan0 table 33333
ip route get 2001:db8::1

Signed-off-by: Steven Barth <cyrus@...nwrt.org>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Kamal Mostafa <kamal@...onical.com>
---
 net/ipv6/fib6_rules.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/net/ipv6/fib6_rules.c b/net/ipv6/fib6_rules.c
index 3fd0a57..ab82a47 100644
--- a/net/ipv6/fib6_rules.c
+++ b/net/ipv6/fib6_rules.c
@@ -104,6 +104,7 @@ static int fib6_rule_action(struct fib_rule *rule, struct flowi *flp,
 				goto again;
 			flp6->saddr = saddr;
 		}
+		err = rt->dst.error;
 		goto out;
 	}
 again:
-- 
1.9.1

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