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net/ipv6: Allow onlink routes to have a device mismatch if it is the default route

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[ Upstream commit 4ed591c8ab44e711e56b8e021ffaf4f407c045f5 ]

The intent of ip6_route_check_nh_onlink is to make sure the gateway
given for an onlink route is not actually on a connected route for
a different interface (e.g., 2001:db8:1::/64 is on dev eth1 and then
an onlink route has a via 2001:db8:1::1 dev eth2). If the gateway
lookup hits the default route then it most likely will be a different
interface than the onlink route which is ok.

Update ip6_route_check_nh_onlink to disregard the device mismatch
if the gateway lookup hits the default route. Turns out the existing
onlink tests are passing because there is no default route or it is
an unreachable default, so update the onlink tests to have a default
route other than unreachable.

Fixes: fc1e64e109 ("net/ipv6: Add support for onlink flag")
Signed-off-by: David Ahern <dsahern@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
David Ahern 2018-10-24 13:58:39 -07:00 committed by Greg Kroah-Hartman
parent 0024aeb004
commit 6a4aa53a94
2 changed files with 9 additions and 7 deletions
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2
net/ipv6/route.c
View File

@ -2799,6 +2799,8 @@ static int ip6_route_check_nh_onlink(struct net *net,
grt = ip6_nh_lookup_table(net, cfg, gw_addr, tbid, 0);
if (grt) {
if (!grt->dst.error &&
/* ignore match if it is the default route */
grt->from && !ipv6_addr_any(&grt->from->fib6_dst.addr) &&
(grt->rt6i_flags & flags || dev != grt->dst.dev)) {
NL_SET_ERR_MSG(extack,
"Nexthop has invalid gateway or device mismatch");

14
tools/testing/selftests/net/fib-onlink-tests.sh
View File

@ -167,8 +167,8 @@ setup()
# add vrf table
ip li add ${VRF} type vrf table ${VRF_TABLE}
ip li set ${VRF} up
ip ro add table ${VRF_TABLE} unreachable default
ip -6 ro add table ${VRF_TABLE} unreachable default
ip ro add table ${VRF_TABLE} unreachable default metric 8192
ip -6 ro add table ${VRF_TABLE} unreachable default metric 8192
# create test interfaces
ip li add ${NETIFS[p1]} type veth peer name ${NETIFS[p2]}
@ -185,20 +185,20 @@ setup()
for n in 1 3 5 7; do
ip li set ${NETIFS[p${n}]} up
ip addr add ${V4ADDRS[p${n}]}/24 dev ${NETIFS[p${n}]}
ip addr add ${V6ADDRS[p${n}]}/64 dev ${NETIFS[p${n}]}
ip addr add ${V6ADDRS[p${n}]}/64 dev ${NETIFS[p${n}]} nodad
done
# move peer interfaces to namespace and add addresses
for n in 2 4 6 8; do
ip li set ${NETIFS[p${n}]} netns ${PEER_NS} up
ip -netns ${PEER_NS} addr add ${V4ADDRS[p${n}]}/24 dev ${NETIFS[p${n}]}
ip -netns ${PEER_NS} addr add ${V6ADDRS[p${n}]}/64 dev ${NETIFS[p${n}]}
ip -netns ${PEER_NS} addr add ${V6ADDRS[p${n}]}/64 dev ${NETIFS[p${n}]} nodad
done
set +e
ip -6 ro add default via ${V6ADDRS[p3]/::[0-9]/::64}
ip -6 ro add table ${VRF_TABLE} default via ${V6ADDRS[p7]/::[0-9]/::64}
# let DAD complete - assume default of 1 probe
sleep 1
set +e
}
cleanup()