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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 ]
MATCH_LIST := [ MATCH_LIST ] MATCH
MATCH := { indev ifname | 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 } |
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 | ip_flags IP_FLAGS
DESCRIPTION
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.
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 hexadecimal format.
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 invo-
cation.
skip_sw
Do not process filter by software. If hardware has no offload support for this fil-
ter, 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 deci-
mal 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.
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 pro-
vided 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
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.
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.
NOTES
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, layer three matches (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 fil-
ter, 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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