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net: Propagate lookup failure in l3mdev_get_saddr to caller

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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>
This commit is contained in:
David Ahern
2016-01-04 09:09:27 -08:00
committed by David S. Miller
parent 7ec2541aa7
commit b5bdacf3bb
5 changed files with 33 additions and 14 deletions
Download Patch File Download Diff File Expand all files Collapse all files

7
net/ipv4/udp.c
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@@ -1025,8 +1025,11 @@ int udp_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
flow_flags,
faddr, saddr, dport, inet->inet_sport);
if (!saddr && ipc.oif)
l3mdev_get_saddr(net, ipc.oif, fl4);
if (!saddr && ipc.oif) {
err = l3mdev_get_saddr(net, ipc.oif, fl4);
if (err < 0)
goto out;
}
security_sk_classify_flow(sk, flowi4_to_flowi(fl4));
rt = ip_route_output_flow(net, fl4, sk);