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authorDavid Ahern <dsa@cumulusnetworks.com>2016-05-07 16:49:00 -0700
committerDavid S. Miller <davem@davemloft.net>2016-05-09 22:33:52 -0400
commit1ff23beebdd315fe4d16070c08c065e89d7debb3 (patch)
treef82066e771ed276e9b9eb5f93b5b0f28ca1061a2
parent4a65896f94fa82370041823837cd75aac1186b54 (diff)
downloadlinux-1ff23beebdd315fe4d16070c08c065e89d7debb3.tar.bz2
net: l3mdev: Allow send on enslaved interface
Allow udp and raw sockets to send by oif that is an enslaved interface versus the l3mdev/VRF device. For example, this allows BFD to use ifindex from IP_PKTINFO on a receive to send a response without the need to convert to the VRF index. It also allows ping and ping6 to work when specifying an enslaved interface (e.g., ping -I swp1 <ip>) which is a natural use case. Signed-off-by: David Ahern <dsa@cumulusnetworks.com> Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--drivers/net/vrf.c2
-rw-r--r--net/ipv4/route.c4
-rw-r--r--net/l3mdev/l3mdev.c17
3 files changed, 19 insertions, 4 deletions
diff --git a/drivers/net/vrf.c b/drivers/net/vrf.c
index 4b2461ae5d3b..c8db55aa8280 100644
--- a/drivers/net/vrf.c
+++ b/drivers/net/vrf.c
@@ -648,6 +648,8 @@ static int vrf_get_saddr(struct net_device *dev, struct flowi4 *fl4)
fl4->flowi4_flags |= FLOWI_FLAG_SKIP_NH_OIF;
fl4->flowi4_iif = LOOPBACK_IFINDEX;
+ /* make sure oif is set to VRF device for lookup */
+ fl4->flowi4_oif = dev->ifindex;
fl4->flowi4_tos = tos & IPTOS_RT_MASK;
fl4->flowi4_scope = ((tos & RTO_ONLINK) ?
RT_SCOPE_LINK : RT_SCOPE_UNIVERSE);
diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index 8c8c655bb2c4..a1f2830d8110 100644
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -2146,6 +2146,7 @@ struct rtable *__ip_route_output_key_hash(struct net *net, struct flowi4 *fl4,
unsigned int flags = 0;
struct fib_result res;
struct rtable *rth;
+ int master_idx;
int orig_oif;
int err = -ENETUNREACH;
@@ -2155,6 +2156,9 @@ struct rtable *__ip_route_output_key_hash(struct net *net, struct flowi4 *fl4,
orig_oif = fl4->flowi4_oif;
+ master_idx = l3mdev_master_ifindex_by_index(net, fl4->flowi4_oif);
+ if (master_idx)
+ fl4->flowi4_oif = master_idx;
fl4->flowi4_iif = LOOPBACK_IFINDEX;
fl4->flowi4_tos = tos & IPTOS_RT_MASK;
fl4->flowi4_scope = ((tos & RTO_ONLINK) ?
diff --git a/net/l3mdev/l3mdev.c b/net/l3mdev/l3mdev.c
index 898d01e0f87b..6651a78e100c 100644
--- a/net/l3mdev/l3mdev.c
+++ b/net/l3mdev/l3mdev.c
@@ -112,12 +112,18 @@ struct dst_entry *l3mdev_get_rt6_dst(struct net *net,
struct dst_entry *dst = NULL;
struct net_device *dev;
- dev = dev_get_by_index(net, fl6->flowi6_oif);
- if (dev) {
- if (netif_is_l3_master(dev) &&
+ if (fl6->flowi6_oif) {
+ rcu_read_lock();
+
+ dev = dev_get_by_index_rcu(net, fl6->flowi6_oif);
+ if (dev && netif_is_l3_slave(dev))
+ dev = netdev_master_upper_dev_get_rcu(dev);
+
+ if (dev && netif_is_l3_master(dev) &&
dev->l3mdev_ops->l3mdev_get_rt6_dst)
dst = dev->l3mdev_ops->l3mdev_get_rt6_dst(dev, fl6);
- dev_put(dev);
+
+ rcu_read_unlock();
}
return dst;
@@ -141,6 +147,9 @@ int l3mdev_get_saddr(struct net *net, int ifindex, struct flowi4 *fl4)
rcu_read_lock();
dev = dev_get_by_index_rcu(net, ifindex);
+ if (dev && netif_is_l3_slave(dev))
+ dev = netdev_master_upper_dev_get_rcu(dev);
+
if (dev && netif_is_l3_master(dev) &&
dev->l3mdev_ops->l3mdev_get_saddr)
rc = dev->l3mdev_ops->l3mdev_get_saddr(dev, fl4);