[PATCH net-next 0/3] net/sched: iptunnel encap/decap/classify using TC

Hi,

This patchset introduces iptunnel support using the TC subsystem.

In the decap flow, it enables the user to redirect packets from a shared tunnel
device and classify by outer and inner headers. The outer headers are extracted
from the metadata and used by the flower filter. A new action act_iptunnel,
releases the metadata.

In the encap flow, act_iptunnel creates a metadata object to be used by the
shared tunnel device. The actual redirection to the tunnel device is done using
act_mirred.

For example:
$ tc qdisc add dev vnet0 ingress
$ tc filter add dev vnet0 protocol ip parent ffff: \
    flower \
  	  ip_proto 1 \
  	action iptunnel encap \
  	  src_ip 11.11.0.1 \
  		dst_ip 11.11.0.2 \
  		id 11 \
  	action mirred egress redirect dev vxlan0
  
$ tc qdisc add dev vxlan0 ingress
$ tc filter add dev vxlan0 protocol ip parent ffff: \
    flower \
  	  enc_src_ip 11.11.0.2 \
  		enc_dst_ip 11.11.0.1 \
  		enc_key_id 11 \
  	action iptunnel decap \
  	  action mirred egress redirect dev vnet0

note: Current implementation supports ipv4 only, but it should be easy to add
      ipv6 later on.

Amir

Changes from RFC:
- Add a new action instead of making mirred too complex
- No need to specify UDP port in action - it is already in the tunnel device
	configuration
- Added a decap operation to drop tunnel metadata

Amir Vadai (3):
  net/ip_tunnels: Introduce tunnel_id_to_key32() and
    key32_to_tunnel_id()
  net/sched: cls_flower: Classify packet in ip tunnels
  net/sched: Introduce act_iptunnel

 drivers/net/vxlan.c                     |   4 +-
 include/net/ip_tunnels.h                |  19 +++
 include/net/tc_act/tc_iptunnel.h        |  24 +++
 include/net/vxlan.h                     |  18 --
 include/uapi/linux/pkt_cls.h            |  11 ++
 include/uapi/linux/tc_act/tc_iptunnel.h |  40 +++++
 net/ipv4/ip_gre.c                       |  23 +--
 net/sched/Kconfig                       |  11 ++
 net/sched/Makefile                      |   1 +
 net/sched/act_iptunnel.c                | 292 ++++++++++++++++++++++++++++++++
 net/sched/cls_flower.c                  |  59 ++++++-
 11 files changed, 459 insertions(+), 43 deletions(-)
 create mode 100644 include/net/tc_act/tc_iptunnel.h
 create mode 100644 include/uapi/linux/tc_act/tc_iptunnel.h
 create mode 100644 net/sched/act_iptunnel.c

-- 
2.9.0