flower - flow based traffic control filter
tc filter ... flower [ MATCH_LIST ] [
action ACTION_SPEC ] [ classid CLASSID ] [
hw_tc TCID ]
MATCH_LIST := [ MATCH_LIST ] MATCH
MATCH := { indev ifname | verbose |
skip_sw | skip_hw | { dst_mac | src_mac }
MASKED_LLADDR | vlan_id VID | vlan_prio
PRIORITY | vlan_ethtype { ipv4 | ipv6 |
ETH_TYPE } | cvlan_id VID | cvlan_prio
PRIORITY | cvlan_ethtype { ipv4 | ipv6 |
ETH_TYPE } | mpls_label LABEL | mpls_tc
TC | mpls_bos BOS | mpls_ttl TTL |
ip_proto { tcp | udp | sctp | icmp |
icmpv6 | IP_PROTO } | ip_tos MASKED_IP_TOS |
ip_ttl MASKED_IP_TTL | { dst_ip | src_ip }
PREFIX | { dst_port | src_port } port_number } |
tcp_flags MASKED_TCP_FLAGS | type MASKED_TYPE |
code MASKED_CODE | { arp_tip | arp_sip }
IPV4_PREFIX | arp_op { request | reply |
OP } | { arp_tha | arp_sha } MASKED_LLADDR |
enc_key_id KEY-ID | { enc_dst_ip | enc_src_ip }
{ ipv4_address | ipv6_address } | enc_dst_port
port_number | enc_tos TOS | enc_ttl TTL |
geneve_opts OPTIONS | ip_flags IP_FLAGS
The flower filter matches flows to the set of keys
specified and assigns an arbitrarily chosen class ID to packets belonging to
them. Additionally (or alternatively) an action from the generic action
framework may be called.
- action
ACTION_SPEC
- Apply an action from the generic actions framework on matching
packets.
- classid
CLASSID
- Specify a class to pass matching packets on to. CLASSID is in the
form X:Y, while X and Y are interpreted as
numbers in hexadecimal format.
- hw_tc
TCID
- Specify a hardware traffic class to pass matching packets on to. TCID is
in the range 0 through 15.
- indev
ifname
- Match on incoming interface name. Obviously this makes sense only for
forwarded flows. ifname is the name of an interface which must
exist at the time of tc invocation.
- verbose
- Enable verbose logging, including offloading errors when not using
skip_sw flag.
- skip_sw
- Do not process filter by software. If hardware has no offload support for
this filter, or TC offload is not enabled for the interface, operation
will fail.
- skip_hw
- Do not process filter by hardware.
- dst_mac
MASKED_LLADDR
- src_mac
MASKED_LLADDR
- Match on source or destination MAC address. A mask may be optionally
provided to limit the bits of the address which are matched. A mask is
provided by following the address with a slash and then the mask. It may
be provided in LLADDR format, in which case it is a bitwise mask, or as a
number of high bits to match. If the mask is missing then a match on all
bits is assumed.
- vlan_id
VID
- Match on vlan tag id. VID is an unsigned 12bit value in decimal
format.
- vlan_prio
PRIORITY
- Match on vlan tag priority. PRIORITY is an unsigned 3bit value in
decimal format.
- vlan_ethtype
VLAN_ETH_TYPE
- Match on layer three protocol. VLAN_ETH_TYPE may be either
ipv4, ipv6 or an unsigned 16bit value in hexadecimal format.
To match on QinQ packet, it must be 802.1Q or 802.1AD.
- cvlan_id
VID
- Match on QinQ inner vlan tag id. VID is an unsigned 12bit value in
decimal format.
- cvlan_prio
PRIORITY
- Match on QinQ inner vlan tag priority. PRIORITY is an unsigned 3bit
value in decimal format.
- cvlan_ethtype
VLAN_ETH_TYPE
- Match on QinQ layer three protocol. VLAN_ETH_TYPE may be either
ipv4, ipv6 or an unsigned 16bit value in hexadecimal
format.
- mpls_label
LABEL
- Match the label id in the outermost MPLS label stack entry. LABEL
is an unsigned 20 bit value in decimal format.
- mpls_tc
TC
- Match on the MPLS TC field, which is typically used for packet priority,
in the outermost MPLS label stack entry. TC is an unsigned 3 bit
value in decimal format.
- mpls_bos
BOS
- Match on the MPLS Bottom Of Stack field in the outermost MPLS label stack
entry. BOS is a 1 bit value in decimal format.
- mpls_ttl
TTL
- Match on the MPLS Time To Live field in the outermost MPLS label stack
entry. TTL is an unsigned 8 bit value in decimal format.
- ip_proto
IP_PROTO
- Match on layer four protocol. IP_PROTO may be tcp,
udp, sctp, icmp, icmpv6 or an unsigned 8bit
value in hexadecimal format.
- ip_tos
MASKED_IP_TOS
- Match on ipv4 TOS or ipv6 traffic-class - eight bits in hexadecimal
format. A mask may be optionally provided to limit the bits which are
matched. A mask is provided by following the value with a slash and then
the mask. If the mask is missing then a match on all bits is assumed.
- ip_ttl
MASKED_IP_TTL
- Match on ipv4 TTL or ipv6 hop-limit - eight bits value in decimal or
hexadecimal format. A mask may be optionally provided to limit the bits
which are matched. Same logic is used for the mask as with matching on
ip_tos.
- dst_ip
PREFIX
- src_ip
PREFIX
- Match on source or destination IP address. PREFIX must be a valid
IPv4 or IPv6 address, depending on the protocol option to tc
filter, optionally followed by a slash and the prefix length. If the
prefix is missing, tc assumes a full-length host match.
- dst_port
NUMBER
- src_port
NUMBER
- Match on layer 4 protocol source or destination port number. Only
available for ip_proto values udp, tcp and
sctp which have to be specified in beforehand.
- tcp_flags
MASKED_TCP_FLAGS
- Match on TCP flags represented as 12bit bitfield in in hexadecimal format.
A mask may be optionally provided to limit the bits which are matched. A
mask is provided by following the value with a slash and then the mask. If
the mask is missing then a match on all bits is assumed.
- type
MASKED_TYPE
- code
MASKED_CODE
- Match on ICMP type or code. A mask may be optionally provided to limit the
bits of the address which are matched. A mask is provided by following the
address with a slash and then the mask. The mask must be as a number which
represents a bitwise mask If the mask is missing then a match on all bits
is assumed. Only available for ip_proto values icmp and
icmpv6 which have to be specified in beforehand.
- arp_tip
IPV4_PREFIX
- arp_sip
IPV4_PREFIX
- Match on ARP or RARP sender or target IP address. IPV4_PREFIX must
be a valid IPv4 address optionally followed by a slash and the prefix
length. If the prefix is missing, tc assumes a full-length host
match.
- arp_op
ARP_OP
- Match on ARP or RARP operation. ARP_OP may be request,
reply or an integer value 0, 1 or 2. A mask may be optionally
provided to limit the bits of the operation which are matched. A mask is
provided by following the address with a slash and then the mask. It may
be provided as an unsigned 8 bit value representing a bitwise mask. If the
mask is missing then a match on all bits is assumed.
- arp_sha
MASKED_LLADDR
- arp_tha
MASKED_LLADDR
- Match on ARP or RARP sender or target MAC address. A mask may be
optionally provided to limit the bits of the address which are matched. A
mask is provided by following the address with a slash and then the mask.
It may be provided in LLADDR format, in which case it is a bitwise mask,
or as a number of high bits to match. If the mask is missing then a match
on all bits is assumed.
- enc_key_id
NUMBER
- enc_dst_ip
PREFIX
- enc_src_ip
PREFIX
- enc_dst_port
NUMBER
- enc_tos
NUMBER
- enc_ttl
NUMBER
- geneve_opts
OPTIONS
- Match on IP tunnel metadata. Key id NUMBER is a 32 bit tunnel key
id (e.g. VNI for VXLAN tunnel). PREFIX must be a valid IPv4 or IPv6
address optionally followed by a slash and the prefix length. If the
prefix is missing, tc assumes a full-length host match. Dst port
NUMBER is a 16 bit UDP dst port. Tos NUMBER is an 8 bit tos
(dscp+ecn) value, ttl NUMBER is an 8 bit time-to-live value.
geneve_opts OPTIONS must be a valid list of comma-separated geneve
options where each option consists of a key optionally followed by a slash
and corresponding mask. If the masks is missing, tc assumes a
full-length match. The options can be described in the form
CLASS:TYPE:DATA/CLASS_MASK:TYPE_MASK:DATA_MASK, where CLASS is represented
as a 16bit hexadecimal value, TYPE as an 8bit hexadecimal value and DATA
as a variable length hexadecimal value.
- ip_flags
IP_FLAGS
- IP_FLAGS may be either frag, nofrag, firstfrag
or nofirstfrag where frag and nofrag could be used to match on
fragmented packets or not, respectively. firstfrag and nofirstfrag can be
used to further distinguish fragmented packet. firstfrag can be used to
indicate the first fragmented packet. nofirstfrag can be used to indicates
subsequent fragmented packets or non-fragmented packets.
As stated above where applicable, matches of a certain layer
implicitly depend on the matches of the next lower layer. Precisely, layer
one and two matches (indev, dst_mac and src_mac) have
no dependency, MPLS and layer three matches (mpls_label,
mpls_tc, mpls_bos, mpls_ttl, ip_proto,
dst_ip, src_ip, arp_tip, arp_sip, arp_op,
arp_tha, arp_sha and ip_flags) depend on the
protocol option of tc filter, layer four port matches
(dst_port and src_port) depend on ip_proto being set to
tcp, udp or sctp, and finally ICMP matches (code
and type) depend on ip_proto being set to icmp or
icmpv6.
There can be only used one mask per one prio. If user needs to
specify different mask, he has to use different prio.