diff options
| author | David Ahern <dsa@cumulusnetworks.com> | 2016-06-16 16:24:25 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2016-06-17 21:25:29 -0700 |
| commit | 0d240e7811c4ec1965760ee4643b5bbc9cfacbb3 (patch) | |
| tree | 8bdf0d3d57832b40568424b1d03bbc0cd51f39a1 /drivers/net/vrf.c | |
| parent | a2e2ff560f5113e8ca31432fbd985f5f1889efdc (diff) | |
net: vrf: Implement get_saddr for IPv6
IPv6 source address selection needs to consider the real egress route.
Similar to IPv4 implement a get_saddr6 method which is called if
source address has not been set. The get_saddr6 method does a full
lookup which means pulling a route from the VRF FIB table and properly
considering linklocal/multicast destination addresses. Lookup failures
(eg., unreachable) then cause the source address selection to fail
which gets propagated back to the caller.
Signed-off-by: David Ahern <dsa@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/vrf.c')
| -rw-r--r-- | drivers/net/vrf.c | 41 |
1 files changed, 41 insertions, 0 deletions
diff --git a/drivers/net/vrf.c b/drivers/net/vrf.c index 32173aa9208e..b3762822b653 100644 --- a/drivers/net/vrf.c +++ b/drivers/net/vrf.c @@ -999,6 +999,46 @@ static struct dst_entry *vrf_get_rt6_dst(const struct net_device *dev, return dst; } + +/* called under rcu_read_lock */ +static int vrf_get_saddr6(struct net_device *dev, const struct sock *sk, + struct flowi6 *fl6) +{ + struct net *net = dev_net(dev); + struct dst_entry *dst; + struct rt6_info *rt; + int err; + + if (rt6_need_strict(&fl6->daddr)) { + rt = vrf_ip6_route_lookup(net, dev, fl6, fl6->flowi6_oif, + RT6_LOOKUP_F_IFACE); + if (unlikely(!rt)) + return 0; + + dst = &rt->dst; + } else { + __u8 flags = fl6->flowi6_flags; + + fl6->flowi6_flags |= FLOWI_FLAG_L3MDEV_SRC; + fl6->flowi6_flags |= FLOWI_FLAG_SKIP_NH_OIF; + + dst = ip6_route_output(net, sk, fl6); + rt = (struct rt6_info *)dst; + + fl6->flowi6_flags = flags; + } + + err = dst->error; + if (!err) { + err = ip6_route_get_saddr(net, rt, &fl6->daddr, + sk ? inet6_sk(sk)->srcprefs : 0, + &fl6->saddr); + } + + dst_release(dst); + + return err; +} #endif static const struct l3mdev_ops vrf_l3mdev_ops = { @@ -1008,6 +1048,7 @@ static const struct l3mdev_ops vrf_l3mdev_ops = { .l3mdev_l3_rcv = vrf_l3_rcv, #if IS_ENABLED(CONFIG_IPV6) .l3mdev_get_rt6_dst = vrf_get_rt6_dst, + .l3mdev_get_saddr6 = vrf_get_saddr6, #endif }; |