netdev - [PATCH] net: Fix nexthop lookups

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <1440009631-8082-1-git-send-email-dsa@cumulusnetworks.com>
Date:	Wed, 19 Aug 2015 11:40:31 -0700
From:	David Ahern <dsa@...ulusnetworks.com>
To:	netdev@...r.kernel.org
Cc:	David Ahern <dsa@...ulusnetworks.com>
Subject: [PATCH] net: Fix nexthop lookups

Andreas reported breakage adding routes with local nexthops:
$ ip route show table main
...
172.28.0.0/24 dev vnf-xe1p0  proto kernel  scope link  src 172.28.0.16

$ ip route add 10.0.0.0/8 via 172.28.0.32 table 100 dev vnf-xe1p0
RTNETLINK answers: Resource temporarily unavailable

3bfd847203c changed the lookup to use the passed in table but for cases like
this the nexthop is in the local table rather than the passed in table.

Fixes: 3bfd847203c ("net: Use passed in table for nexthop lookups")
Reported-by: Andreas Schultz <aschultz@...p.net>
Signed-off-by: David Ahern <dsa@...ulusnetworks.com>
---
 net/ipv4/fib_semantics.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/net/ipv4/fib_semantics.c b/net/ipv4/fib_semantics.c
index c8025851dac7..0ab5bf558805 100644
--- a/net/ipv4/fib_semantics.c
+++ b/net/ipv4/fib_semantics.c
@@ -710,9 +710,16 @@ static int fib_check_nh(struct fib_config *cfg, struct fib_info *fi,
 				err = fib_table_lookup(tbl, &fl4, &res,
 						       FIB_LOOKUP_IGNORE_LINKSTATE |
 						       FIB_LOOKUP_NOREF);
-			else
+
+			/* on error or if no table given do full lookup. This
+			 * is needed for example when nexthops are in the local
+			 * table rather than the given table
+			 */
+			if (!tbl || err) {
 				err = fib_lookup(net, &fl4, &res,
 						 FIB_LOOKUP_IGNORE_LINKSTATE);
+			}
+
 			if (err) {
 				rcu_read_unlock();
 				return err;
-- 
2.3.2 (Apple Git-55)

--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html