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net: vxlan: Add nolocalbypass option to vxlan.

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If a packet needs to be encapsulated towards a local destination IP, the
packet will undergo a "local bypass" and be injected into the Rx path as
if it was received by the target VXLAN device without undergoing
encapsulation. If such a device does not exist, the packet will be
dropped.

There are scenarios where we do not want to perform such a bypass, but
instead want the packet to be encapsulated and locally received by a
user space program for post-processing.

To that end, add a new VXLAN device attribute that controls whether a
"local bypass" is performed or not. Default to performing a bypass to
maintain existing behavior.

Signed-off-by: Vladimir Nikishkin <vladimir@nikishkin.pw>
Reviewed-by: Ido Schimmel <idosch@nvidia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Vladimir Nikishkin
2023-05-12 11:40:33 +08:00
committed by David S. Miller
parent 7eef636ecc
commit 69474a8a58
3 changed files with 23 additions and 3 deletions
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4
include/net/vxlan.h
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@ -328,6 +328,7 @@ struct vxlan_dev {
#define VXLAN_F_TTL_INHERIT 0x10000
#define VXLAN_F_VNIFILTER 0x20000
#define VXLAN_F_MDB 0x40000
#define VXLAN_F_LOCALBYPASS 0x80000
/* Flags that are used in the receive path. These flags must match in
* order for a socket to be shareable
@ -348,7 +349,8 @@ struct vxlan_dev {
VXLAN_F_UDP_ZERO_CSUM6_TX | \
VXLAN_F_UDP_ZERO_CSUM6_RX | \
VXLAN_F_COLLECT_METADATA | \
VXLAN_F_VNIFILTER)
VXLAN_F_VNIFILTER | \
VXLAN_F_LOCALBYPASS)
struct net_device *vxlan_dev_create(struct net *net, const char *name,
u8 name_assign_type, struct vxlan_config *conf);