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The Linux Kernel
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  • Netlink Family Specifications »
  • Family ovs_flow netlink specification
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Family ovs_flow netlink specification¶

Contents

  • Family ovs_flow netlink specification

    • Summary

    • Operations

      • get

      • new

    • Multicast groups

    • Definitions

      • ovs-header

      • ovs-flow-stats

      • ovs-key-ethernet

      • ovs-key-mpls

      • ovs-key-ipv4

      • ovs-key-ipv6

      • ovs-key-ipv6-exthdrs

      • ovs-frag-type

      • ovs-key-tcp

      • ovs-key-udp

      • ovs-key-sctp

      • ovs-key-icmp

      • ovs-key-arp

      • ovs-key-nd

      • ovs-key-ct-tuple-ipv4

      • ovs-action-push-vlan

      • ovs-ufid-flags

      • ovs-action-hash

      • ovs-hash-alg

      • ovs-action-push-mpls

      • ovs-action-add-mpls

      • ct-state-flags

    • Attribute sets

      • flow-attrs

        • key (nest)

        • actions (nest)

        • stats (binary)

        • tcp-flags (u8)

        • used (u64)

        • clear (flag)

        • mask (nest)

        • probe (binary)

        • ufid (binary)

        • ufid-flags (u32)

        • pad (binary)

      • key-attrs

        • encap (nest)

        • priority (u32)

        • in-port (u32)

        • ethernet (binary)

        • vlan (u16)

        • ethertype (u16)

        • ipv4 (binary)

        • ipv6 (binary)

        • tcp (binary)

        • udp (binary)

        • icmp (binary)

        • icmpv6 (binary)

        • arp (binary)

        • nd (binary)

        • skb-mark (u32)

        • tunnel (nest)

        • sctp (binary)

        • tcp-flags (u16)

        • dp-hash (u32)

        • recirc-id (u32)

        • mpls (binary)

        • ct-state (u32)

        • ct-zone (u16)

        • ct-mark (u32)

        • ct-labels (binary)

        • ct-orig-tuple-ipv4 (binary)

        • ct-orig-tuple-ipv6 (binary)

        • nsh (nest)

        • packet-type (u32)

        • nd-extensions (binary)

        • tunnel-info (binary)

        • ipv6-exthdrs (binary)

      • action-attrs

        • output (u32)

        • userspace (nest)

        • set (nest)

        • push-vlan (binary)

        • pop-vlan (flag)

        • sample (nest)

        • recirc (u32)

        • hash (binary)

        • push-mpls (binary)

        • pop-mpls (u16)

        • set-masked (nest)

        • ct (nest)

        • trunc (u32)

        • push-eth (binary)

        • pop-eth (flag)

        • ct-clear (flag)

        • push-nsh (nest)

        • pop-nsh (flag)

        • meter (u32)

        • clone (nest)

        • check-pkt-len (nest)

        • add-mpls (binary)

        • dec-ttl (nest)

        • psample (nest)

      • tunnel-key-attrs

        • id (u64)

        • ipv4-src (u32)

        • ipv4-dst (u32)

        • tos (u8)

        • ttl (u8)

        • dont-fragment (flag)

        • csum (flag)

        • oam (flag)

        • geneve-opts (binary)

        • tp-src (u16)

        • tp-dst (u16)

        • vxlan-opts (nest)

        • ipv6-src (binary)

        • ipv6-dst (binary)

        • pad (binary)

        • erspan-opts (binary)

        • ipv4-info-bridge (flag)

      • check-pkt-len-attrs

        • pkt-len (u16)

        • actions-if-greater (nest)

        • actions-if-less-equal (nest)

      • sample-attrs

        • probability (u32)

        • actions (nest)

      • userspace-attrs

        • pid (u32)

        • userdata (binary)

        • egress-tun-port (u32)

        • actions (flag)

      • ovs-nsh-key-attrs

        • base (binary)

        • md1 (binary)

        • md2 (binary)

      • ct-attrs

        • commit (flag)

        • zone (u16)

        • mark (binary)

        • labels (binary)

        • helper (string)

        • nat (nest)

        • force-commit (flag)

        • eventmask (u32)

        • timeout (string)

      • nat-attrs

        • src (flag)

        • dst (flag)

        • ip-min (binary)

        • ip-max (binary)

        • proto-min (u16)

        • proto-max (u16)

        • persistent (flag)

        • proto-hash (flag)

        • proto-random (flag)

      • dec-ttl-attrs

        • action (nest)

      • vxlan-ext-attrs

        • gbp (u32)

      • psample-attrs

        • group (u32)

        • cookie (binary)

Summary¶

OVS flow configuration over generic netlink.

Operations¶

get¶

Get / dump OVS flow configuration and state

value

3

attribute-set

flow-attrs

do
request
attributes

[key, ufid, ufid-flags]

reply
attributes

[key, ufid, mask, stats, actions]

dump
request
attributes

[key, ufid, ufid-flags]

reply
attributes

[key, ufid, mask, stats, actions]

new¶

Create OVS flow configuration in a data path

value

1

attribute-set

flow-attrs

do
request
attributes

[key, ufid, mask, actions]

Multicast groups¶

  • ovs_flow

Definitions¶

ovs-header¶

type

struct

doc

Header for OVS Generic Netlink messages.

members
dp-ifindex

ifindex of local port for datapath (0 to make a request not specificto a datapath).

ovs-flow-stats¶

type

struct

members
n-packets

Number of matched packets.

n-bytes

Number of matched bytes.

ovs-key-ethernet¶

type

struct

members
eth-src

eth-dst

ovs-key-mpls¶

type

struct

members
mpls-lse

ovs-key-ipv4¶

type

struct

members
ipv4-src

ipv4-dst

ipv4-proto

ipv4-tos

ipv4-ttl

ipv4-frag

ovs-key-ipv6¶

type

struct

members
ipv6-src

ipv6-dst

ipv6-label

ipv6-proto

ipv6-tclass

ipv6-hlimit

ipv6-frag

ovs-key-ipv6-exthdrs¶

type

struct

members
hdrs

ovs-frag-type¶

name-prefix

ovs-frag-type-

enum-name

ovs-frag-type

type

enum

entries
none

Packet is not a fragment.

first

Packet is a fragment with offset 0.

later

Packet is a fragment with nonzero offset.

any

ovs-key-tcp¶

type

struct

members
tcp-src

tcp-dst

ovs-key-udp¶

type

struct

members
udp-src

udp-dst

ovs-key-sctp¶

type

struct

members
sctp-src

sctp-dst

ovs-key-icmp¶

type

struct

members
icmp-type

icmp-code

ovs-key-arp¶

type

struct

members
arp-sip

arp-tip

arp-op

arp-sha

arp-tha

ovs-key-nd¶

type

struct

members
nd_target

nd-sll

nd-tll

ovs-key-ct-tuple-ipv4¶

type

struct

members
ipv4-src

ipv4-dst

src-port

dst-port

ipv4-proto

ovs-action-push-vlan¶

type

struct

members
vlan_tpid

Tag protocol identifier (TPID) to push.

vlan_tci

Tag control identifier (TCI) to push.

ovs-ufid-flags¶

name-prefix

ovs-ufid-f-

enum-name

None

type

flags

entries
  • omit-key

  • omit-mask

  • omit-actions

ovs-action-hash¶

type

struct

members
hash-alg

Algorithm used to compute hash prior to recirculation.

hash-basis

Basis used for computing hash.

ovs-hash-alg¶

enum-name

ovs-hash-alg

type

enum

doc

Data path hash algorithm for computing Datapath hash. The algorithm type only specifiesthe fields in a flow will be used as part of the hash. Each datapath is free to use itsown hash algorithm. The hash value will be opaque to the user space daemon.

entries
  • ovs-hash-alg-l4

ovs-action-push-mpls¶

type

struct

members
mpls-lse

MPLS label stack entry to push

mpls-ethertype

Ethertype to set in the encapsulating ethernet frame. The only valuesethertype should ever be given are ETH_P_MPLS_UC and ETH_P_MPLS_MC,indicating MPLS unicast or multicast. Other are rejected.

ovs-action-add-mpls¶

type

struct

members
mpls-lse

MPLS label stack entry to push

mpls-ethertype

Ethertype to set in the encapsulating ethernet frame. The only valuesethertype should ever be given are ETH_P_MPLS_UC and ETH_P_MPLS_MC,indicating MPLS unicast or multicast. Other are rejected.

tun-flags

MPLS tunnel attributes.

ct-state-flags¶

enum-name

None

type

flags

name-prefix

ovs-cs-f-

entries
new

Beginning of a new connection.

established

Part of an existing connenction

related

Related to an existing connection.

reply-dir

Flow is in the reply direction.

invalid

Could not track the connection.

tracked

Conntrack has occurred.

src-nat

Packet’s source address/port was mangled by NAT.

dst-nat

Packet’s destination address/port was mangled by NAT.

Attribute sets¶

flow-attrs¶

key (nest)¶

nested-attributes

key-attrs

doc

Nested attributes specifying the flow key. Always present innotifications. Required for all requests (except dumps).

actions (nest)¶

nested-attributes

action-attrs

doc

Nested attributes specifying the actions to take for packets thatmatch the key. Always present in notifications. Required forOVS_FLOW_CMD_NEW requests, optional for OVS_FLOW_CMD_SET requests. AnOVS_FLOW_CMD_SET without OVS_FLOW_ATTR_ACTIONS will not modify theactions. To clear the actions, an OVS_FLOW_ATTR_ACTIONS without anynested attributes must be given.

stats (binary)¶

struct

ovs-flow-stats

doc

Statistics for this flow. Present in notifications if the stats wouldbe nonzero. Ignored in requests.

tcp-flags (u8)¶

doc

An 8-bit value giving the ORed value of all of the TCP flags seen onpackets in this flow. Only present in notifications for TCP flows, andonly if it would be nonzero. Ignored in requests.

used (u64)¶

doc

A 64-bit integer giving the time, in milliseconds on the systemmonotonic clock, at which a packet was last processed for thisflow. Only present in notifications if a packet has been processed forthis flow. Ignored in requests.

clear (flag)¶

doc

If present in a OVS_FLOW_CMD_SET request, clears the last-used time,accumulated TCP flags, and statistics for this flow. Otherwiseignored in requests. Never present in notifications.

mask (nest)¶

nested-attributes

key-attrs

doc

Nested attributes specifying the mask bits for wildcarded flowmatch. Mask bit value ‘1’ specifies exact match with correspondingflow key bit, while mask bit value ‘0’ specifies a wildcardedmatch. Omitting attribute is treated as wildcarding all correspondingfields. Optional for all requests. If not present, all flow key bitsare exact match bits.

probe (binary)¶

doc

Flow operation is a feature probe, error logging should be suppressed.

ufid (binary)¶

doc

A value between 1-16 octets specifying a unique identifier for theflow. Causes the flow to be indexed by this value rather than thevalue of the OVS_FLOW_ATTR_KEY attribute. Optional for allrequests. Present in notifications if the flow was created with thisattribute.

display-hint

uuid

ufid-flags (u32)¶

enum

ovs-ufid-flags

doc

A 32-bit value of ORed flags that provide alternative semantics forflow installation and retrieval. Optional for all requests.

pad (binary)¶

key-attrs¶

encap (nest)¶

nested-attributes

key-attrs

priority (u32)¶

in-port (u32)¶

ethernet (binary)¶

struct

ovs-key-ethernet

doc

struct ovs_key_ethernet

vlan (u16)¶

byte-order

big-endian

ethertype (u16)¶

byte-order

big-endian

ipv4 (binary)¶

struct

ovs-key-ipv4

ipv6 (binary)¶

struct

ovs-key-ipv6

doc

struct ovs_key_ipv6

tcp (binary)¶

struct

ovs-key-tcp

udp (binary)¶

struct

ovs-key-udp

icmp (binary)¶

struct

ovs-key-icmp

icmpv6 (binary)¶

struct

ovs-key-icmp

arp (binary)¶

struct

ovs-key-arp

doc

struct ovs_key_arp

nd (binary)¶

struct

ovs-key-nd

doc

struct ovs_key_nd

skb-mark (u32)¶

tunnel (nest)¶

nested-attributes

tunnel-key-attrs

sctp (binary)¶

struct

ovs-key-sctp

tcp-flags (u16)¶

byte-order

big-endian

dp-hash (u32)¶

doc

Value 0 indicates the hash is not computed by the datapath.

recirc-id (u32)¶

mpls (binary)¶

struct

ovs-key-mpls

ct-state (u32)¶

enum

ct-state-flags

enum-as-flags

True

ct-zone (u16)¶

doc

connection tracking zone

ct-mark (u32)¶

doc

connection tracking mark

ct-labels (binary)¶

display-hint

hex

doc

16-octet connection tracking label

ct-orig-tuple-ipv4 (binary)¶

struct

ovs-key-ct-tuple-ipv4

ct-orig-tuple-ipv6 (binary)¶

doc

struct ovs_key_ct_tuple_ipv6

nsh (nest)¶

nested-attributes

ovs-nsh-key-attrs

packet-type (u32)¶

byte-order

big-endian

doc

Should not be sent to the kernel

nd-extensions (binary)¶

doc

Should not be sent to the kernel

tunnel-info (binary)¶

doc

struct ip_tunnel_info

ipv6-exthdrs (binary)¶

struct

ovs-key-ipv6-exthdrs

doc

struct ovs_key_ipv6_exthdr

action-attrs¶

output (u32)¶

doc

ovs port number in datapath

userspace (nest)¶

nested-attributes

userspace-attrs

set (nest)¶

nested-attributes

key-attrs

doc

Replaces the contents of an existing header. The single nested attribute specifies a header to modify and its value.

push-vlan (binary)¶

struct

ovs-action-push-vlan

doc

Push a new outermost 802.1Q or 802.1ad header onto the packet.

pop-vlan (flag)¶

doc

Pop the outermost 802.1Q or 802.1ad header from the packet.

sample (nest)¶

nested-attributes

sample-attrs

doc

Probabilistically executes actions, as specified in the nested attributes.

recirc (u32)¶

doc

recirc id

hash (binary)¶

struct

ovs-action-hash

push-mpls (binary)¶

struct

ovs-action-push-mpls

doc

Push a new MPLS label stack entry onto the top of the packets MPLSlabel stack. Set the ethertype of the encapsulating frame to eitherETH_P_MPLS_UC or ETH_P_MPLS_MC to indicate the new packet contents.

pop-mpls (u16)¶

byte-order

big-endian

doc

ethertype

set-masked (nest)¶

nested-attributes

key-attrs

doc

Replaces the contents of an existing header. A nested attributespecifies a header to modify, its value, and a mask. For every bit setin the mask, the corresponding bit value is copied from the value tothe packet header field, rest of the bits are left unchanged. Thenon-masked value bits must be passed in as zeroes. Masking is notsupported for the OVS_KEY_ATTR_TUNNEL attribute.

ct (nest)¶

nested-attributes

ct-attrs

doc

Track the connection. Populate the conntrack-related entriesin the flow key.

trunc (u32)¶

doc

struct ovs_action_trunc is a u32 max length

push-eth (binary)¶

doc

struct ovs_action_push_eth

pop-eth (flag)¶

ct-clear (flag)¶

push-nsh (nest)¶

nested-attributes

ovs-nsh-key-attrs

doc

Push NSH header to the packet.

pop-nsh (flag)¶

doc

Pop the outermost NSH header off the packet.

meter (u32)¶

doc

Run packet through a meter, which may drop the packet, or modify thepacket (e.g., change the DSCP field)

clone (nest)¶

nested-attributes

action-attrs

doc

Make a copy of the packet and execute a list of actions withoutaffecting the original packet and key.

check-pkt-len (nest)¶

nested-attributes

check-pkt-len-attrs

doc

Check the packet length and execute a set of actions if greater thanthe specified packet length, else execute another set of actions.

add-mpls (binary)¶

struct

ovs-action-add-mpls

doc

Push a new MPLS label stack entry at the start of the packet or at thestart of the l3 header depending on the value of l3 tunnel flag in thetun_flags field of this OVS_ACTION_ATTR_ADD_MPLS argument.

dec-ttl (nest)¶

nested-attributes

dec-ttl-attrs

psample (nest)¶

nested-attributes

psample-attrs

doc

Sends a packet sample to psample for external observation.

tunnel-key-attrs¶

id (u64)¶

byte-order

big-endian

value

0

ipv4-src (u32)¶

byte-order

big-endian

ipv4-dst (u32)¶

byte-order

big-endian

tos (u8)¶

ttl (u8)¶

dont-fragment (flag)¶

csum (flag)¶

oam (flag)¶

geneve-opts (binary)¶

sub-type

u32

tp-src (u16)¶

byte-order

big-endian

tp-dst (u16)¶

byte-order

big-endian

vxlan-opts (nest)¶

nested-attributes

vxlan-ext-attrs

ipv6-src (binary)¶

doc

struct in6_addr source IPv6 address

ipv6-dst (binary)¶

doc

struct in6_addr destination IPv6 address

pad (binary)¶

erspan-opts (binary)¶

doc

struct erspan_metadata

ipv4-info-bridge (flag)¶

check-pkt-len-attrs¶

pkt-len (u16)¶

actions-if-greater (nest)¶

nested-attributes

action-attrs

actions-if-less-equal (nest)¶

nested-attributes

action-attrs

sample-attrs¶

probability (u32)¶

actions (nest)¶

nested-attributes

action-attrs

userspace-attrs¶

pid (u32)¶

userdata (binary)¶

egress-tun-port (u32)¶

actions (flag)¶

ovs-nsh-key-attrs¶

base (binary)¶

md1 (binary)¶

md2 (binary)¶

ct-attrs¶

commit (flag)¶

zone (u16)¶

mark (binary)¶

labels (binary)¶

helper (string)¶

nat (nest)¶

nested-attributes

nat-attrs

force-commit (flag)¶

eventmask (u32)¶

timeout (string)¶

nat-attrs¶

src (flag)¶

dst (flag)¶

ip-min (binary)¶

ip-max (binary)¶

proto-min (u16)¶

proto-max (u16)¶

persistent (flag)¶

proto-hash (flag)¶

proto-random (flag)¶

dec-ttl-attrs¶

action (nest)¶

nested-attributes

action-attrs

vxlan-ext-attrs¶

gbp (u32)¶

psample-attrs¶

group (u32)¶

cookie (binary)¶

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