Flower filter in tc(8) Linux Flower filter in tc(8)
NAME
flower - flow based traffic control filter
SYNOPSIS
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 } |
pppoe_sid PSID | ppp_proto { ip | ipv6 | mpls_uc | mpls_mc |
PPP_PROTO } | mpls LSE_LIST | mpls_label LABEL | mpls_tc TC |
mpls_bos BOS | mpls_ttl TTL | l2tpv3_sid LSID | ip_proto { tcp |
udp | sctp | icmp | icmpv6 | l2tp | IP_PROTO } | ip_tos
MASKED_IP_TOS | ip_ttl MASKED_IP_TTL | { dst_ip | src_ip } PRE-
FIX | { dst_port | src_port } { MASKED_NUMBER | min_port_number-
max_port_number } | tcp_flags MASKED_TCP_FLAGS | type
MASKED_TYPE | code MASKED_CODE | { arp_tip | arp_sip } IPV4_PRE-
FIX | 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 | vxlan_opts |
erspan_opts | gtp_opts | pfcp_opts } OPTIONS | ip_flags IP_FLAGS
| l2_miss L2_MISS | cfm CFM_OPTIONS | enc_flags ENCFLAG-LIST }
LSE_LIST := [ LSE_LIST ] LSE
LSE := lse depth DEPTH { label LABEL | tc TC | bos BOS | ttl TTL }
CFM := cfm mdl LEVEL | op OPCODE
ENCFLAG-LIST := [ ENCFLAG-LIST/ ] ENCFLAG
ENCFLAG := { [no]tuncsum | [no]tundf | [no]tunoam | [no]tuncrit }
DESCRIPTION
The flower filter matches flows to the set of keys specified and assigns
an arbitrarily chosen class ID to packets belonging to them. Addition-
ally (or alternatively) an action from the generic action framework may
be called.
OPTIONS
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 hexa-
decimal 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 us-
ing 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 in-
terface, 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 op-
tionally 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.
num_of_vlans NUM
Match on the number of vlan tags in the packet. NUM can be 0 or
small positive integer. Typically in 0-4 range.
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.
pppoe_sid PSID
Match on PPPoE session id. PSID is an unsigned 16bit value in
decimal format.
ppp_proto PPP_PROTO
Match on PPP layer three protocol. PPP_PROTO may be either ip,
ipv6, mpls_uc, mpls_mc or an unsigned 16bit value in hexadecimal
format.
mpls LSE_LIST
Match on the MPLS label stack. LSE_LIST is a list of Label Stack
Entries, each introduced by the lse keyword. This option can't
be used together with the standalone mpls_label, mpls_tc,
mpls_bos and mpls_ttl options.
lse LSE_OPTIONS
Match on an MPLS Label Stack Entry. LSE_OPTIONS is a list
of options that describe the properties of the LSE to
match.
depth DEPTH
The depth of the Label Stack Entry to consider.
Depth starts at 1 (the outermost Label Stack En-
try). The maximum usable depth may be limited by
the kernel. This option is mandatory. DEPTH is an
unsigned 8 bit value in decimal format.
label LABEL
Match on the MPLS Label field at the specified
depth. LABEL is an unsigned 20 bit value in deci-
mal format.
tc TC Match on the MPLS Traffic Class field at the speci-
fied depth. TC is an unsigned 3 bit value in deci-
mal format.
bos BOS
Match on the MPLS Bottom Of Stack field at the
specified depth. BOS is a 1 bit value in decimal
format.
ttl TTL
Match on the MPLS Time To Live field at the speci-
fied depth. TTL is an unsigned 8 bit value in dec-
imal format.
mpls_label LABEL
Match the label id in the outermost MPLS label stack entry. LA-
BEL 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 un-
signed 3 bit value in decimal format.
mpls_bos BOS
Match on the MPLS Bottom Of Stack field in the outermost MPLS la-
bel 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.
l2tpv3_sid LSID
Match on L2TPv3 session id field transported over IPv4 or IPv6.
LSID is an unsigned 32 bit value in decimal format.
ip_proto IP_PROTO
Match on layer four protocol. IP_PROTO may be tcp, udp, sctp,
icmp, icmpv6, l2tp or an unsigned 8bit value in hexadecimal for-
mat.
ip_tos MASKED_IP_TOS
Match on ipv4 TOS or ipv6 traffic-class - eight bits in hexadeci-
mal 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 deci-
mal 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 { MASKED_NUMBER | MIN_VALUE-MAX_VALUE }
src_port { MASKED_NUMBER | MIN_VALUE-MAX_VALUE }
Match on layer 4 protocol source or destination port number, with
an optional mask. Alternatively, the minimum and maximum values
can be specified to match on a range of layer 4 protocol source
or destination port numbers. 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 hexadeci-
mal 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 pro-
vided 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 pro-
vided 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
ct_state CT_STATE
ct_zone CT_MASKED_ZONE
ct_mark CT_MASKED_MARK
ct_label CT_MASKED_LABEL
Matches on connection tracking info
CT_STATE
Match the connection state, and can be combination of
[{+|-}flag] flags, where flag can be one of
trk - Tracked connection.
new - New connection.
est - Established connection.
rpl - The packet is in the reply direction, meaning that
it is in the opposite direction from the packet that ini-
tiated the connection.
inv - The state is invalid. The packet couldn't be associ-
ated to a connection.
rel - The packet is related to an existing connection.
Example: +trk+est
CT_MASKED_ZONE
Match the connection zone, and can be masked.
CT_MASKED_MARK
32bit match on the connection mark, and can be masked.
CT_MASKED_LABEL
128bit match on the connection label, and can be masked.
geneve_opts OPTIONS
vxlan_opts OPTIONS
erspan_opts OPTIONS
gtp_opts OPTIONS
pfcp_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 op-
tionally 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 hexa-
decimal value and DATA as a variable length hexadecimal value.
vxlan_opts OPTIONS doesn't support multiple options, and it con-
sists of a key followed by a slash and corresponding mask. If the
mask is missing, tc assumes a full-length match. The option can
be described in the form GBP/GBP_MASK, where GBP is represented
as a 32bit number. erspan_opts OPTIONS doesn't support multiple
options, and it consists of a key followed by a slash and corre-
sponding mask. If the mask is missing, tc assumes a full-length
match. The option can be described in the form VERSION:IN-
DEX:DIR:HWID/VERSION:INDEX_MASK:DIR_MASK:HWID_MASK, where VERSION
is represented as a 8bit number, INDEX as an 32bit number, DIR
and HWID as a 8bit number. Multiple options is not supported.
Note INDEX/INDEX_MASK is used when VERSION is 1, and DIR/DIR_MASK
and HWID/HWID_MASK are used when VERSION is 2. gtp_opts OPTIONS
doesn't support multiple options, and it consists of a key fol-
lowed by a slash and corresponding mask. If the mask is missing,
tc assumes a full-length match. The option can be described in
the form PDU_TYPE:QFI/PDU_TYPE_MASK:QFI_MASK where both PDU_TYPE
and QFI are represented as a 8bit hexadecimal values. pfcp_opts
OPTIONS does not support multiple options. It consists of a key
followed by a slash and corresponding mask. If the mask is miss-
ing, tc assumes a full-length match. The option can be described
in the form TYPE:SEID/TYPE_MASK:SEID_MASK where TYPE is repre-
sented as a 8bit number, SEID is represented by 64bit. Both TYPE
and SEID are provided in hex.
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 pack-
ets 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.
l2_miss L2_MISS
Match on layer 2 miss in the bridge driver's FDB / MDB. L2_MISS
may be 0 or 1. When 1, match on packets that encountered a layer
2 miss. When 0, match on packets that were forwarded using an FDB
/ MDB entry. Note that broadcast packets do not encounter a miss
since a lookup is not performed for them.
cfm CFM_OPTIONS
Match on Connectivity Fault Management (CFM) fields. CFM_OPTIONS
is a list of options that describe the properties of the CFM in-
formation fields to match.
mdl LEVEL
Match on the Maintenance Domain (MD) level field. LEVEL
is an unsigned 3 bit value in decimal format.
op OPCODE
Match on the CFM opcode field. OPCODE is an unsigned 8 bit
value in decimal format.
enc_flags ENCFLAG-LIST
Match on tunnel control flags. ENCFLAG-LIST is a list of the
following tunnel control flags: [no]tuncsum, [no]tundf,
[no]tunoam, [no]tuncrit, each separated by '/'.
NOTES As stated above where applicable, matches of a certain layer im-
plicitly depend on the matches of the next lower layer. Pre-
cisely, layer one and two matches (indev, dst_mac, src_mac and
enc_flags) have no dependency, MPLS and layer three matches
(mpls, 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.
SEE ALSO
tc(8), tc-flow(8)
iproute2 22 Oct 2015 Flower filter in tc(8)
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