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authorThomas Graf <tgraf@suug.ch>2015-07-21 11:43:58 +0300
committerDavid S. Miller <davem@davemloft.net>2015-07-21 20:39:06 +0300
commitee122c79d4227f6ec642157834b6a90fcffa4382 (patch)
treec70e570367668c4f9f4314c076e8afffb300117e /include/net/vxlan.h
parent0accfc268f4d3345693d3af3d5780aae3ad93d8d (diff)
downloadlinux-ee122c79d4227f6ec642157834b6a90fcffa4382.tar.xz
vxlan: Flow based tunneling
Allows putting a VXLAN device into a new flow-based mode in which skbs with a ip_tunnel_info dst metadata attached will be encapsulated according to the instructions stored in there with the VXLAN device defaults taken into consideration. Similar on the receive side, if the VXLAN_F_COLLECT_METADATA flag is set, the packet processing will populate a ip_tunnel_info struct for each packet received and attach it to the skb using the new metadata dst. The metadata structure will contain the outer header and tunnel header fields which have been stripped off. Layers further up in the stack such as routing, tc or netfitler can later match on these fields and perform forwarding. It is the responsibility of upper layers to ensure that the flag is set if the metadata is needed. The flag limits the additional cost of metadata collecting based on demand. This prepares the VXLAN device to be steered by the routing and other subsystems which allows to support encapsulation for a large number of tunnel endpoints and tunnel ids through a single net_device which improves the scalability. It also allows for OVS to leverage this mode which in turn allows for the removal of the OVS specific VXLAN code. Because the skb is currently scrubed in vxlan_rcv(), the attachment of the new dst metadata is postponed until after scrubing which requires the temporary addition of a new member to vxlan_metadata. This member is removed again in a later commit after the indirect VXLAN receive API has been removed. Signed-off-by: Thomas Graf <tgraf@suug.ch> Signed-off-by: Pravin B Shelar <pshelar@nicira.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/net/vxlan.h')
-rw-r--r--include/net/vxlan.h10
1 files changed, 9 insertions, 1 deletions
diff --git a/include/net/vxlan.h b/include/net/vxlan.h
index 0082b5d33d7d..80a2da29e088 100644
--- a/include/net/vxlan.h
+++ b/include/net/vxlan.h
@@ -7,6 +7,7 @@
#include <linux/skbuff.h>
#include <linux/netdevice.h>
#include <linux/udp.h>
+#include <net/dst_metadata.h>
#define VNI_HASH_BITS 10
#define VNI_HASH_SIZE (1<<VNI_HASH_BITS)
@@ -97,6 +98,9 @@ struct vxlanhdr {
struct vxlan_metadata {
__be32 vni;
u32 gbp;
+
+ /* Temporary until vxlan_rcv() API is gone */
+ struct metadata_dst *tun_dst;
};
struct vxlan_sock;
@@ -130,6 +134,8 @@ struct vxlan_sock {
#define VXLAN_F_REMCSUM_RX 0x400
#define VXLAN_F_GBP 0x800
#define VXLAN_F_REMCSUM_NOPARTIAL 0x1000
+#define VXLAN_F_COLLECT_METADATA 0x2000
+#define VXLAN_F_FLOW_BASED 0x4000
/* Flags that are used in the receive path. These flags must match in
* order for a socket to be shareable
@@ -137,7 +143,9 @@ struct vxlan_sock {
#define VXLAN_F_RCV_FLAGS (VXLAN_F_GBP | \
VXLAN_F_UDP_ZERO_CSUM6_RX | \
VXLAN_F_REMCSUM_RX | \
- VXLAN_F_REMCSUM_NOPARTIAL)
+ VXLAN_F_REMCSUM_NOPARTIAL | \
+ VXLAN_F_COLLECT_METADATA | \
+ VXLAN_F_FLOW_BASED)
struct vxlan_sock *vxlan_sock_add(struct net *net, __be16 port,
vxlan_rcv_t *rcv, void *data,