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net: vrf: Add support for sends to local broadcast address

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[ Upstream commit 1e19c4d689dc1e95bafd23ef68fbc0c6b9e05180 ]

Sukumar reported that sends to the local broadcast address
(255.255.255.255) are broken. Check for the address in vrf driver
and do not redirect to the VRF device - similar to multicast
packets.

With this change sockets can use SO_BINDTODEVICE to specify an
egress interface and receive responses. Note: the egress interface
can not be a VRF device but needs to be the enslaved device.

https://bugzilla.kernel.org/show_bug.cgi?id=198521

Reported-by: Sukumar Gopalakrishnan <sukumarg1973@gmail.com>
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 2018-01-24 19:37:37 -08:00 committed by Greg Kroah-Hartman
parent d3048a12f3
commit 6ea6b86ae7
1 changed files with 3 additions and 2 deletions
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5
drivers/net/vrf.c
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@ -674,8 +674,9 @@ static struct sk_buff *vrf_ip_out(struct net_device *vrf_dev,
struct sock *sk,
struct sk_buff *skb)
{
/* don't divert multicast */
if (ipv4_is_multicast(ip_hdr(skb)->daddr))
/* don't divert multicast or local broadcast */
if (ipv4_is_multicast(ip_hdr(skb)->daddr) ||
ipv4_is_lbcast(ip_hdr(skb)->daddr))
return skb;
if (qdisc_tx_is_default(vrf_dev))