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User-Space MPLS actions and matches

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This patch implements use-space datapath and non-datapath code
to match and use the datapath API set out in Leo Alterman's patch
"user-space datapath: Add basic MPLS support to kernel".

The resulting MPLS implementation supports:
* Pushing a single MPLS label
* Poping a single MPLS label
* Modifying an MPLS lable using set-field or load actions
  that act on the label value, tc and bos bit.
* There is no support for manipulating the TTL
  this is considered future work.

The single-level push pop limitation is implemented by processing
push, pop and set-field/load actions in order and discarding information
that would require multiple levels of push/pop to be supported.

e.g.
   push,push -> the first push is discarded
   pop,pop -> the first pop is discarded

This patch is based heavily on work by Ravi K.

Cc: Ravi K <rkerur@gmail.com>
Reviewed-by: Isaku Yamahata <yamahata@valinux.co.jp>
Signed-off-by: Simon Horman <horms@verge.net.au>
Signed-off-by: Ben Pfaff <blp@nicira.com>
This commit is contained in:
Simon Horman
2013-01-25 16:22:07 +09:00
committed by Ben Pfaff
parent d224e35014
commit b02475c53b
29 changed files with 1223 additions and 61 deletions
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36
include/linux/openvswitch.h
View File

@@ -283,6 +283,8 @@ enum ovs_key_attr {
#ifdef __KERNEL__
OVS_KEY_ATTR_IPV4_TUNNEL, /* struct ovs_key_ipv4_tunnel */
#endif
OVS_KEY_ATTR_MPLS = 62, /* struct ovs_key_mpls */
OVS_KEY_ATTR_TUN_ID = 63, /* be64 tunnel ID */
__OVS_KEY_ATTR_MAX
};
@@ -325,6 +327,10 @@ struct ovs_key_ethernet {
__u8 eth_dst[6];
};
struct ovs_key_mpls {
__be32 mpls_top_lse;
};
struct ovs_key_ipv4 {
__be32 ipv4_src;
__be32 ipv4_dst;
@@ -454,6 +460,19 @@ enum ovs_userspace_attr {
#define OVS_USERSPACE_ATTR_MAX (__OVS_USERSPACE_ATTR_MAX - 1)
/**
* struct ovs_action_push_mpls - %OVS_ACTION_ATTR_PUSH_MPLS action argument.
* @mpls_lse: MPLS label stack entry to push.
* @mpls_ethertype: Ethertype to set in the encapsulating ethernet frame.
*
* The only values @mpls_ethertype should ever be given are %ETH_P_MPLS_UC and
* %ETH_P_MPLS_MC, indicating MPLS unicast or multicast. Other are rejected.
*/
struct ovs_action_push_mpls {
__be32 mpls_lse;
__be16 mpls_ethertype; /* Either %ETH_P_MPLS_UC or %ETH_P_MPLS_MC */
};
/**
* struct ovs_action_push_vlan - %OVS_ACTION_ATTR_PUSH_VLAN action argument.
* @vlan_tpid: Tag protocol identifier (TPID) to push.
@@ -476,14 +495,23 @@ struct ovs_action_push_vlan {
* @OVS_ACTION_ATTR_OUTPUT: Output packet to port.
* @OVS_ACTION_ATTR_USERSPACE: Send packet to userspace according to nested
* %OVS_USERSPACE_ATTR_* attributes.
* @OVS_ACTION_ATTR_SET: Replaces the contents of an existing header. The
* single nested %OVS_KEY_ATTR_* attribute specifies a header to modify and its
* value.
* @OVS_ACTION_ATTR_PUSH_VLAN: Push a new outermost 802.1Q header onto the
* packet.
* @OVS_ACTION_ATTR_POP_VLAN: Pop the outermost 802.1Q header off the packet.
* @OVS_ACTION_ATTR_SAMPLE: Probabilitically executes actions, as specified in
* the nested %OVS_SAMPLE_ATTR_* attributes.
* @OVS_ACTION_ATTR_SET: Replaces the contents of an existing header. The
* single nested %OVS_KEY_ATTR_* attribute specifies a header to modify and its
* value.
* @OVS_ACTION_ATTR_PUSH_MPLS: Push a new MPLS label stack entry onto the
* top of the packets MPLS label stack. Set the ethertype of the
* encapsulating frame to either %ETH_P_MPLS_UC or %ETH_P_MPLS_MC to
* indicate the new packet contents.
* @OVS_ACTION_ATTR_POP_MPLS: Pop an MPLS label stack entry off of the
* packet's MPLS label stack. Set the encapsulating frame's ethertype to
* indicate the new packet contents This could potentially still be
* %ETH_P_MPLS_* if the resulting MPLS label stack is not empty. If there
* is no MPLS label stack, as determined by ethertype, no action is taken.
*
* Only a single header can be set with a single %OVS_ACTION_ATTR_SET. Not all
* fields within a header are modifiable, e.g. the IPv4 protocol and fragment
@@ -498,6 +526,8 @@ enum ovs_action_attr {
OVS_ACTION_ATTR_PUSH_VLAN, /* struct ovs_action_push_vlan. */
OVS_ACTION_ATTR_POP_VLAN, /* No argument. */
OVS_ACTION_ATTR_SAMPLE, /* Nested OVS_SAMPLE_ATTR_*. */
OVS_ACTION_ATTR_PUSH_MPLS, /* struct ovs_action_push_mpls. */
OVS_ACTION_ATTR_POP_MPLS, /* __be16 ethertype. */
__OVS_ACTION_ATTR_MAX
};