net: Propagate lookup failure in l3mdev_get_saddr to caller
Commands run in a vrf context are not failing as expected on a route lookup:
root@kenny:~# ip ro ls table vrf-red
unreachable default
root@kenny:~# ping -I vrf-red -c1 -w1 10.100.1.254
ping: Warning: source address might be selected on device other than vrf-red.
PING 10.100.1.254 (10.100.1.254) from 0.0.0.0 vrf-red: 56(84) bytes of data.
--- 10.100.1.254 ping statistics ---
2 packets transmitted, 0 received, 100% packet loss, time 999ms
Since the vrf table does not have a route for 10.100.1.254 the ping
should have failed. The saddr lookup causes a full VRF table lookup.
Propogating a lookup failure to the user allows the command to fail as
expected:
root@kenny:~# ping -I vrf-red -c1 -w1 10.100.1.254
connect: No route to host
Signed-off-by: David Ahern <dsa@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/net/l3mdev.h b/include/net/l3mdev.h
index 774d85b..5689a0c 100644
--- a/include/net/l3mdev.h
+++ b/include/net/l3mdev.h
@@ -29,7 +29,7 @@
/* IPv4 ops */
struct rtable * (*l3mdev_get_rtable)(const struct net_device *dev,
const struct flowi4 *fl4);
- void (*l3mdev_get_saddr)(struct net_device *dev,
+ int (*l3mdev_get_saddr)(struct net_device *dev,
struct flowi4 *fl4);
/* IPv6 ops */
@@ -112,10 +112,11 @@
return rc;
}
-static inline void l3mdev_get_saddr(struct net *net, int ifindex,
- struct flowi4 *fl4)
+static inline int l3mdev_get_saddr(struct net *net, int ifindex,
+ struct flowi4 *fl4)
{
struct net_device *dev;
+ int rc = 0;
if (ifindex) {
@@ -124,11 +125,13 @@
dev = dev_get_by_index_rcu(net, ifindex);
if (dev && netif_is_l3_master(dev) &&
dev->l3mdev_ops->l3mdev_get_saddr) {
- dev->l3mdev_ops->l3mdev_get_saddr(dev, fl4);
+ rc = dev->l3mdev_ops->l3mdev_get_saddr(dev, fl4);
}
rcu_read_unlock();
}
+
+ return rc;
}
static inline struct dst_entry *l3mdev_get_rt6_dst(const struct net_device *dev,
@@ -200,9 +203,10 @@
return false;
}
-static inline void l3mdev_get_saddr(struct net *net, int ifindex,
- struct flowi4 *fl4)
+static inline int l3mdev_get_saddr(struct net *net, int ifindex,
+ struct flowi4 *fl4)
{
+ return 0;
}
static inline