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linux/net/sched/Kconfig
Daniel Borkmann e420bed025 bpf: Add fd-based tcx multi-prog infra with link support 
This work refactors and adds a lightweight extension ("tcx") to the tc BPF
ingress and egress data path side for allowing BPF program management based
on fds via bpf() syscall through the newly added generic multi-prog API.
The main goal behind this work which we also presented at LPC [0] last year
and a recent update at LSF/MM/BPF this year [3] is to support long-awaited
BPF link functionality for tc BPF programs, which allows for a model of safe
ownership and program detachment.

Given the rise in tc BPF users in cloud native environments, this becomes
necessary to avoid hard to debug incidents either through stale leftover
programs or 3rd party applications accidentally stepping on each others toes.
As a recap, a BPF link represents the attachment of a BPF program to a BPF
hook point. The BPF link holds a single reference to keep BPF program alive.
Moreover, hook points do not reference a BPF link, only the application's
fd or pinning does. A BPF link holds meta-data specific to attachment and
implements operations for link creation, (atomic) BPF program update,
detachment and introspection. The motivation for BPF links for tc BPF programs
is multi-fold, for example:

  - From Meta: "It's especially important for applications that are deployed
    fleet-wide and that don't "control" hosts they are deployed to. If such
    application crashes and no one notices and does anything about that, BPF
    program will keep running draining resources or even just, say, dropping
    packets. We at FB had outages due to such permanent BPF attachment
    semantics. With fd-based BPF link we are getting a framework, which allows
    safe, auto-detachable behavior by default, unless application explicitly
    opts in by pinning the BPF link." [1]

  - From Cilium-side the tc BPF programs we attach to host-facing veth devices
    and phys devices build the core datapath for Kubernetes Pods, and they
    implement forwarding, load-balancing, policy, EDT-management, etc, within
    BPF. Currently there is no concept of 'safe' ownership, e.g. we've recently
    experienced hard-to-debug issues in a user's staging environment where
    another Kubernetes application using tc BPF attached to the same prio/handle
    of cls_bpf, accidentally wiping all Cilium-based BPF programs from underneath
    it. The goal is to establish a clear/safe ownership model via links which
    cannot accidentally be overridden. [0,2]

BPF links for tc can co-exist with non-link attachments, and the semantics are
in line also with XDP links: BPF links cannot replace other BPF links, BPF
links cannot replace non-BPF links, non-BPF links cannot replace BPF links and
lastly only non-BPF links can replace non-BPF links. In case of Cilium, this
would solve mentioned issue of safe ownership model as 3rd party applications
would not be able to accidentally wipe Cilium programs, even if they are not
BPF link aware.

Earlier attempts [4] have tried to integrate BPF links into core tc machinery
to solve cls_bpf, which has been intrusive to the generic tc kernel API with
extensions only specific to cls_bpf and suboptimal/complex since cls_bpf could
be wiped from the qdisc also. Locking a tc BPF program in place this way, is
getting into layering hacks given the two object models are vastly different.

We instead implemented the tcx (tc 'express') layer which is an fd-based tc BPF
attach API, so that the BPF link implementation blends in naturally similar to
other link types which are fd-based and without the need for changing core tc
internal APIs. BPF programs for tc can then be successively migrated from classic
cls_bpf to the new tc BPF link without needing to change the program's source
code, just the BPF loader mechanics for attaching is sufficient.

For the current tc framework, there is no change in behavior with this change
and neither does this change touch on tc core kernel APIs. The gist of this
patch is that the ingress and egress hook have a lightweight, qdisc-less
extension for BPF to attach its tc BPF programs, in other words, a minimal
entry point for tc BPF. The name tcx has been suggested from discussion of
earlier revisions of this work as a good fit, and to more easily differ between
the classic cls_bpf attachment and the fd-based one.

For the ingress and egress tcx points, the device holds a cache-friendly array
with program pointers which is separated from control plane (slow-path) data.
Earlier versions of this work used priority to determine ordering and expression
of dependencies similar as with classic tc, but it was challenged that for
something more future-proof a better user experience is required. Hence this
resulted in the design and development of the generic attach/detach/query API
for multi-progs. See prior patch with its discussion on the API design. tcx is
the first user and later we plan to integrate also others, for example, one
candidate is multi-prog support for XDP which would benefit and have the same
'look and feel' from API perspective.

The goal with tcx is to have maximum compatibility to existing tc BPF programs,
so they don't need to be rewritten specifically. Compatibility to call into
classic tcf_classify() is also provided in order to allow successive migration
or both to cleanly co-exist where needed given its all one logical tc layer and
the tcx plus classic tc cls/act build one logical overall processing pipeline.

tcx supports the simplified return codes TCX_NEXT which is non-terminating (go
to next program) and terminating ones with TCX_PASS, TCX_DROP, TCX_REDIRECT.
The fd-based API is behind a static key, so that when unused the code is also
not entered. The struct tcx_entry's program array is currently static, but
could be made dynamic if necessary at a point in future. The a/b pair swap
design has been chosen so that for detachment there are no allocations which
otherwise could fail.

The work has been tested with tc-testing selftest suite which all passes, as
well as the tc BPF tests from the BPF CI, and also with Cilium's L4LB.

Thanks also to Nikolay Aleksandrov and Martin Lau for in-depth early reviews
of this work.

  [0] https://lpc.events/event/16/contributions/1353/
  [1] https://lore.kernel.org/bpf/CAEf4BzbokCJN33Nw_kg82sO=xppXnKWEncGTWCTB9vGCmLB6pw@mail.gmail.com
  [2] https://colocatedeventseu2023.sched.com/event/1Jo6O/tales-from-an-ebpf-programs-murder-mystery-hemanth-malla-guillaume-fournier-datadog
  [3] http://vger.kernel.org/bpfconf2023_material/tcx_meta_netdev_borkmann.pdf
  [4] https://lore.kernel.org/bpf/20210604063116.234316-1-memxor@gmail.com

Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Jakub Kicinski <kuba@kernel.org>
Link: https://lore.kernel.org/r/20230719140858.13224-3-daniel@iogearbox.net
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
2023-07-19 10:07:27 -07:00

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# SPDX-License-Identifier: GPL-2.0-only
#
# Traffic control configuration.
#
menuconfig NET_SCHED
bool "QoS and/or fair queueing"
select NET_SCH_FIFO
help
When the kernel has several packets to send out over a network
device, it has to decide which ones to send first, which ones to
delay, and which ones to drop. This is the job of the queueing
disciplines, several different algorithms for how to do this
"fairly" have been proposed.
If you say N here, you will get the standard packet scheduler, which
is a FIFO (first come, first served). If you say Y here, you will be
able to choose from among several alternative algorithms which can
then be attached to different network devices. This is useful for
example if some of your network devices are real time devices that
need a certain minimum data flow rate, or if you need to limit the
maximum data flow rate for traffic which matches specified criteria.
This code is considered to be experimental.
To administer these schedulers, you'll need the user-level utilities
from the package iproute2+tc at
<https://www.kernel.org/pub/linux/utils/net/iproute2/>. That package
also contains some documentation; for more, check out
<http://www.linuxfoundation.org/collaborate/workgroups/networking/iproute2>.
This Quality of Service (QoS) support will enable you to use
Differentiated Services (diffserv) and Resource Reservation Protocol
(RSVP) on your Linux router if you also say Y to the corresponding
classifiers below. Documentation and software is at
<http://diffserv.sourceforge.net/>.
If you say Y here and to "/proc file system" below, you will be able
to read status information about packet schedulers from the file
/proc/net/psched.
The available schedulers are listed in the following questions; you
can say Y to as many as you like. If unsure, say N now.
if NET_SCHED
comment "Queueing/Scheduling"
config NET_SCH_HTB
tristate "Hierarchical Token Bucket (HTB)"
help
Say Y here if you want to use the Hierarchical Token Buckets (HTB)
packet scheduling algorithm. See
<http://luxik.cdi.cz/~devik/qos/htb/> for complete manual and
in-depth articles.
HTB is very similar to CBQ regarding its goals however is has
different properties and different algorithm.
To compile this code as a module, choose M here: the
module will be called sch_htb.
config NET_SCH_HFSC
tristate "Hierarchical Fair Service Curve (HFSC)"
help
Say Y here if you want to use the Hierarchical Fair Service Curve
(HFSC) packet scheduling algorithm.
To compile this code as a module, choose M here: the
module will be called sch_hfsc.
config NET_SCH_PRIO
tristate "Multi Band Priority Queueing (PRIO)"
help
Say Y here if you want to use an n-band priority queue packet
scheduler.
To compile this code as a module, choose M here: the
module will be called sch_prio.
config NET_SCH_MULTIQ
tristate "Hardware Multiqueue-aware Multi Band Queuing (MULTIQ)"
help
Say Y here if you want to use an n-band queue packet scheduler
to support devices that have multiple hardware transmit queues.
To compile this code as a module, choose M here: the
module will be called sch_multiq.
config NET_SCH_RED
tristate "Random Early Detection (RED)"
help
Say Y here if you want to use the Random Early Detection (RED)
packet scheduling algorithm.
See the top of <file:net/sched/sch_red.c> for more details.
To compile this code as a module, choose M here: the
module will be called sch_red.
config NET_SCH_SFB
tristate "Stochastic Fair Blue (SFB)"
help
Say Y here if you want to use the Stochastic Fair Blue (SFB)
packet scheduling algorithm.
See the top of <file:net/sched/sch_sfb.c> for more details.
To compile this code as a module, choose M here: the
module will be called sch_sfb.
config NET_SCH_SFQ
tristate "Stochastic Fairness Queueing (SFQ)"
help
Say Y here if you want to use the Stochastic Fairness Queueing (SFQ)
packet scheduling algorithm.
See the top of <file:net/sched/sch_sfq.c> for more details.
To compile this code as a module, choose M here: the
module will be called sch_sfq.
config NET_SCH_TEQL
tristate "True Link Equalizer (TEQL)"
help
Say Y here if you want to use the True Link Equalizer (TLE) packet
scheduling algorithm. This queueing discipline allows the combination
of several physical devices into one virtual device.
See the top of <file:net/sched/sch_teql.c> for more details.
To compile this code as a module, choose M here: the
module will be called sch_teql.
config NET_SCH_TBF
tristate "Token Bucket Filter (TBF)"
help
Say Y here if you want to use the Token Bucket Filter (TBF) packet
scheduling algorithm.
See the top of <file:net/sched/sch_tbf.c> for more details.
To compile this code as a module, choose M here: the
module will be called sch_tbf.
config NET_SCH_CBS
tristate "Credit Based Shaper (CBS)"
help
Say Y here if you want to use the Credit Based Shaper (CBS) packet
scheduling algorithm.
See the top of <file:net/sched/sch_cbs.c> for more details.
To compile this code as a module, choose M here: the
module will be called sch_cbs.
config NET_SCH_ETF
tristate "Earliest TxTime First (ETF)"
help
Say Y here if you want to use the Earliest TxTime First (ETF) packet
scheduling algorithm.
See the top of <file:net/sched/sch_etf.c> for more details.
To compile this code as a module, choose M here: the
module will be called sch_etf.
config NET_SCH_MQPRIO_LIB
tristate
help
Common library for manipulating mqprio queue configurations.
config NET_SCH_TAPRIO
tristate "Time Aware Priority (taprio) Scheduler"
select NET_SCH_MQPRIO_LIB
help
Say Y here if you want to use the Time Aware Priority (taprio) packet
scheduling algorithm.
See the top of <file:net/sched/sch_taprio.c> for more details.
To compile this code as a module, choose M here: the
module will be called sch_taprio.
config NET_SCH_GRED
tristate "Generic Random Early Detection (GRED)"
help
Say Y here if you want to use the Generic Random Early Detection
(GRED) packet scheduling algorithm for some of your network devices
(see the top of <file:net/sched/sch_red.c> for details and
references about the algorithm).
To compile this code as a module, choose M here: the
module will be called sch_gred.
config NET_SCH_NETEM
tristate "Network emulator (NETEM)"
help
Say Y if you want to emulate network delay, loss, and packet
re-ordering. This is often useful to simulate networks when
testing applications or protocols.
To compile this driver as a module, choose M here: the module
will be called sch_netem.
If unsure, say N.
config NET_SCH_DRR
tristate "Deficit Round Robin scheduler (DRR)"
help
Say Y here if you want to use the Deficit Round Robin (DRR) packet
scheduling algorithm.
To compile this driver as a module, choose M here: the module
will be called sch_drr.
If unsure, say N.
config NET_SCH_MQPRIO
tristate "Multi-queue priority scheduler (MQPRIO)"
select NET_SCH_MQPRIO_LIB
help
Say Y here if you want to use the Multi-queue Priority scheduler.
This scheduler allows QOS to be offloaded on NICs that have support
for offloading QOS schedulers.
To compile this driver as a module, choose M here: the module will
be called sch_mqprio.
If unsure, say N.
config NET_SCH_SKBPRIO
tristate "SKB priority queue scheduler (SKBPRIO)"
help
Say Y here if you want to use the SKB priority queue
scheduler. This schedules packets according to skb->priority,
which is useful for request packets in DoS mitigation systems such
as Gatekeeper.
To compile this driver as a module, choose M here: the module will
be called sch_skbprio.
If unsure, say N.
config NET_SCH_CHOKE
tristate "CHOose and Keep responsive flow scheduler (CHOKE)"
help
Say Y here if you want to use the CHOKe packet scheduler (CHOose
and Keep for responsive flows, CHOose and Kill for unresponsive
flows). This is a variation of RED which tries to penalize flows
that monopolize the queue.
To compile this code as a module, choose M here: the
module will be called sch_choke.
config NET_SCH_QFQ
tristate "Quick Fair Queueing scheduler (QFQ)"
help
Say Y here if you want to use the Quick Fair Queueing Scheduler (QFQ)
packet scheduling algorithm.
To compile this driver as a module, choose M here: the module
will be called sch_qfq.
If unsure, say N.
config NET_SCH_CODEL
tristate "Controlled Delay AQM (CODEL)"
help
Say Y here if you want to use the Controlled Delay (CODEL)
packet scheduling algorithm.
To compile this driver as a module, choose M here: the module
will be called sch_codel.
If unsure, say N.
config NET_SCH_FQ_CODEL
tristate "Fair Queue Controlled Delay AQM (FQ_CODEL)"
help
Say Y here if you want to use the FQ Controlled Delay (FQ_CODEL)
packet scheduling algorithm.
To compile this driver as a module, choose M here: the module
will be called sch_fq_codel.
If unsure, say N.
config NET_SCH_CAKE
tristate "Common Applications Kept Enhanced (CAKE)"
help
Say Y here if you want to use the Common Applications Kept Enhanced
(CAKE) queue management algorithm.
To compile this driver as a module, choose M here: the module
will be called sch_cake.
If unsure, say N.
config NET_SCH_FQ
tristate "Fair Queue"
help
Say Y here if you want to use the FQ packet scheduling algorithm.
FQ does flow separation, and is able to respect pacing requirements
set by TCP stack into sk->sk_pacing_rate (for locally generated
traffic)
To compile this driver as a module, choose M here: the module
will be called sch_fq.
If unsure, say N.
config NET_SCH_HHF
tristate "Heavy-Hitter Filter (HHF)"
help
Say Y here if you want to use the Heavy-Hitter Filter (HHF)
packet scheduling algorithm.
To compile this driver as a module, choose M here: the module
will be called sch_hhf.
config NET_SCH_PIE
tristate "Proportional Integral controller Enhanced (PIE) scheduler"
help
Say Y here if you want to use the Proportional Integral controller
Enhanced scheduler packet scheduling algorithm.
For more information, please see https://tools.ietf.org/html/rfc8033
To compile this driver as a module, choose M here: the module
will be called sch_pie.
If unsure, say N.
config NET_SCH_FQ_PIE
depends on NET_SCH_PIE
tristate "Flow Queue Proportional Integral controller Enhanced (FQ-PIE)"
help
Say Y here if you want to use the Flow Queue Proportional Integral
controller Enhanced (FQ-PIE) packet scheduling algorithm.
For more information, please see https://tools.ietf.org/html/rfc8033
To compile this driver as a module, choose M here: the module
will be called sch_fq_pie.
If unsure, say N.
config NET_SCH_INGRESS
tristate "Ingress/classifier-action Qdisc"
depends on NET_CLS_ACT
select NET_XGRESS
help
Say Y here if you want to use classifiers for incoming and/or outgoing
packets. This qdisc doesn't do anything else besides running classifiers,
which can also have actions attached to them. In case of outgoing packets,
classifiers that this qdisc holds are executed in the transmit path
before real enqueuing to an egress qdisc happens.
If unsure, say Y.
To compile this code as a module, choose M here: the module will be
called sch_ingress with alias of sch_clsact.
config NET_SCH_PLUG
tristate "Plug network traffic until release (PLUG)"
help
This queuing discipline allows userspace to plug/unplug a network
output queue, using the netlink interface. When it receives an
enqueue command it inserts a plug into the outbound queue that
causes following packets to enqueue until a dequeue command arrives
over netlink, causing the plug to be removed and resuming the normal
packet flow.
This module also provides a generic "network output buffering"
functionality (aka output commit), wherein upon arrival of a dequeue
command, only packets up to the first plug are released for delivery.
The Remus HA project uses this module to enable speculative execution
of virtual machines by allowing the generated network output to be rolled
back if needed.
For more information, please refer to <http://wiki.xenproject.org/wiki/Remus>
Say Y here if you are using this kernel for Xen dom0 and
want to protect Xen guests with Remus.
To compile this code as a module, choose M here: the
module will be called sch_plug.
config NET_SCH_ETS
tristate "Enhanced transmission selection scheduler (ETS)"
help
The Enhanced Transmission Selection scheduler is a classful
queuing discipline that merges functionality of PRIO and DRR
qdiscs in one scheduler. ETS makes it easy to configure a set of
strict and bandwidth-sharing bands to implement the transmission
selection described in 802.1Qaz.
Say Y here if you want to use the ETS packet scheduling
algorithm.
To compile this driver as a module, choose M here: the module
will be called sch_ets.
If unsure, say N.
menuconfig NET_SCH_DEFAULT
bool "Allow override default queue discipline"
help
Support for selection of default queuing discipline.
Nearly all users can safely say no here, and the default
of pfifo_fast will be used. Many distributions already set
the default value via /proc/sys/net/core/default_qdisc.
If unsure, say N.
if NET_SCH_DEFAULT
choice
prompt "Default queuing discipline"
default DEFAULT_PFIFO_FAST
help
Select the queueing discipline that will be used by default
for all network devices.
config DEFAULT_FQ
bool "Fair Queue" if NET_SCH_FQ
config DEFAULT_CODEL
bool "Controlled Delay" if NET_SCH_CODEL
config DEFAULT_FQ_CODEL
bool "Fair Queue Controlled Delay" if NET_SCH_FQ_CODEL
config DEFAULT_FQ_PIE
bool "Flow Queue Proportional Integral controller Enhanced" if NET_SCH_FQ_PIE
config DEFAULT_SFQ
bool "Stochastic Fair Queue" if NET_SCH_SFQ
config DEFAULT_PFIFO_FAST
bool "Priority FIFO Fast"
endchoice
config DEFAULT_NET_SCH
string
default "pfifo_fast" if DEFAULT_PFIFO_FAST
default "fq" if DEFAULT_FQ
default "fq_codel" if DEFAULT_FQ_CODEL
default "fq_pie" if DEFAULT_FQ_PIE
default "sfq" if DEFAULT_SFQ
default "pfifo_fast"
endif
comment "Classification"
config NET_CLS
bool
config NET_CLS_BASIC
tristate "Elementary classification (BASIC)"
select NET_CLS
help
Say Y here if you want to be able to classify packets using
only extended matches and actions.
To compile this code as a module, choose M here: the
module will be called cls_basic.
config NET_CLS_ROUTE4
tristate "Routing decision (ROUTE)"
depends on INET
select IP_ROUTE_CLASSID
select NET_CLS
help
If you say Y here, you will be able to classify packets
according to the route table entry they matched.
To compile this code as a module, choose M here: the
module will be called cls_route.
config NET_CLS_FW
tristate "Netfilter mark (FW)"
select NET_CLS
help
If you say Y here, you will be able to classify packets
according to netfilter/firewall marks.
To compile this code as a module, choose M here: the
module will be called cls_fw.
config NET_CLS_U32
tristate "Universal 32bit comparisons w/ hashing (U32)"
select NET_CLS
help
Say Y here to be able to classify packets using a universal
32bit pieces based comparison scheme.
To compile this code as a module, choose M here: the
module will be called cls_u32.
config CLS_U32_PERF
bool "Performance counters support"
depends on NET_CLS_U32
help
Say Y here to make u32 gather additional statistics useful for
fine tuning u32 classifiers.
config CLS_U32_MARK
bool "Netfilter marks support"
depends on NET_CLS_U32
help
Say Y here to be able to use netfilter marks as u32 key.
config NET_CLS_FLOW
tristate "Flow classifier"
select NET_CLS
help
If you say Y here, you will be able to classify packets based on
a configurable combination of packet keys. This is mostly useful
in combination with SFQ.
To compile this code as a module, choose M here: the
module will be called cls_flow.
config NET_CLS_CGROUP
tristate "Control Group Classifier"
select NET_CLS
select CGROUP_NET_CLASSID
depends on CGROUPS
help
Say Y here if you want to classify packets based on the control
cgroup of their process.
To compile this code as a module, choose M here: the
module will be called cls_cgroup.
config NET_CLS_BPF
tristate "BPF-based classifier"
select NET_CLS
help
If you say Y here, you will be able to classify packets based on
programmable BPF (JIT'ed) filters as an alternative to ematches.
To compile this code as a module, choose M here: the module will
be called cls_bpf.
config NET_CLS_FLOWER
tristate "Flower classifier"
select NET_CLS
help
If you say Y here, you will be able to classify packets based on
a configurable combination of packet keys and masks.
To compile this code as a module, choose M here: the module will
be called cls_flower.
config NET_CLS_MATCHALL
tristate "Match-all classifier"
select NET_CLS
help
If you say Y here, you will be able to classify packets based on
nothing. Every packet will match.
To compile this code as a module, choose M here: the module will
be called cls_matchall.
config NET_EMATCH
bool "Extended Matches"
select NET_CLS
help
Say Y here if you want to use extended matches on top of classifiers
and select the extended matches below.
Extended matches are small classification helpers not worth writing
a separate classifier for.
A recent version of the iproute2 package is required to use
extended matches.
config NET_EMATCH_STACK
int "Stack size"
depends on NET_EMATCH
default "32"
help
Size of the local stack variable used while evaluating the tree of
ematches. Limits the depth of the tree, i.e. the number of
encapsulated precedences. Every level requires 4 bytes of additional
stack space.
config NET_EMATCH_CMP
tristate "Simple packet data comparison"
depends on NET_EMATCH
help
Say Y here if you want to be able to classify packets based on
simple packet data comparisons for 8, 16, and 32bit values.
To compile this code as a module, choose M here: the
module will be called em_cmp.
config NET_EMATCH_NBYTE
tristate "Multi byte comparison"
depends on NET_EMATCH
help
Say Y here if you want to be able to classify packets based on
multiple byte comparisons mainly useful for IPv6 address comparisons.
To compile this code as a module, choose M here: the
module will be called em_nbyte.
config NET_EMATCH_U32
tristate "U32 key"
depends on NET_EMATCH
help
Say Y here if you want to be able to classify packets using
the famous u32 key in combination with logic relations.
To compile this code as a module, choose M here: the
module will be called em_u32.
config NET_EMATCH_META
tristate "Metadata"
depends on NET_EMATCH
help
Say Y here if you want to be able to classify packets based on
metadata such as load average, netfilter attributes, socket
attributes and routing decisions.
To compile this code as a module, choose M here: the
module will be called em_meta.
config NET_EMATCH_TEXT
tristate "Textsearch"
depends on NET_EMATCH
select TEXTSEARCH
select TEXTSEARCH_KMP
select TEXTSEARCH_BM
select TEXTSEARCH_FSM
help
Say Y here if you want to be able to classify packets based on
textsearch comparisons.
To compile this code as a module, choose M here: the
module will be called em_text.
config NET_EMATCH_CANID
tristate "CAN Identifier"
depends on NET_EMATCH && (CAN=y || CAN=m)
help
Say Y here if you want to be able to classify CAN frames based
on CAN Identifier.
To compile this code as a module, choose M here: the
module will be called em_canid.
config NET_EMATCH_IPSET
tristate "IPset"
depends on NET_EMATCH && IP_SET
help
Say Y here if you want to be able to classify packets based on
ipset membership.
To compile this code as a module, choose M here: the
module will be called em_ipset.
config NET_EMATCH_IPT
tristate "IPtables Matches"
depends on NET_EMATCH && NETFILTER && NETFILTER_XTABLES
help
Say Y here to be able to classify packets based on iptables
matches.
Current supported match is "policy" which allows packet classification
based on IPsec policy that was used during decapsulation
To compile this code as a module, choose M here: the
module will be called em_ipt.
config NET_CLS_ACT
bool "Actions"
select NET_CLS
select NET_XGRESS
help
Say Y here if you want to use traffic control actions. Actions
get attached to classifiers and are invoked after a successful
classification. They are used to overwrite the classification
result, instantly drop or redirect packets, etc.
A recent version of the iproute2 package is required to use
extended matches.
config NET_ACT_POLICE
tristate "Traffic Policing"
depends on NET_CLS_ACT
help
Say Y here if you want to do traffic policing, i.e. strict
bandwidth limiting. This action replaces the existing policing
module.
To compile this code as a module, choose M here: the
module will be called act_police.
config NET_ACT_GACT
tristate "Generic actions"
depends on NET_CLS_ACT
help
Say Y here to take generic actions such as dropping and
accepting packets.
To compile this code as a module, choose M here: the
module will be called act_gact.
config GACT_PROB
bool "Probability support"
depends on NET_ACT_GACT
help
Say Y here to use the generic action randomly or deterministically.
config NET_ACT_MIRRED
tristate "Redirecting and Mirroring"
depends on NET_CLS_ACT
help
Say Y here to allow packets to be mirrored or redirected to
other devices.
To compile this code as a module, choose M here: the
module will be called act_mirred.
config NET_ACT_SAMPLE
tristate "Traffic Sampling"
depends on NET_CLS_ACT
select PSAMPLE
help
Say Y here to allow packet sampling tc action. The packet sample
action consists of statistically choosing packets and sampling
them using the psample module.
To compile this code as a module, choose M here: the
module will be called act_sample.
config NET_ACT_IPT
tristate "IPtables targets"
depends on NET_CLS_ACT && NETFILTER && NETFILTER_XTABLES
help
Say Y here to be able to invoke iptables targets after successful
classification.
To compile this code as a module, choose M here: the
module will be called act_ipt.
config NET_ACT_NAT
tristate "Stateless NAT"
depends on NET_CLS_ACT
help
Say Y here to do stateless NAT on IPv4 packets. You should use
netfilter for NAT unless you know what you are doing.
To compile this code as a module, choose M here: the
module will be called act_nat.
config NET_ACT_PEDIT
tristate "Packet Editing"
depends on NET_CLS_ACT
help
Say Y here if you want to mangle the content of packets.
To compile this code as a module, choose M here: the
module will be called act_pedit.
config NET_ACT_SIMP
tristate "Simple Example (Debug)"
depends on NET_CLS_ACT
help
Say Y here to add a simple action for demonstration purposes.
It is meant as an example and for debugging purposes. It will
print a configured policy string followed by the packet count
to the console for every packet that passes by.
If unsure, say N.
To compile this code as a module, choose M here: the
module will be called act_simple.
config NET_ACT_SKBEDIT
tristate "SKB Editing"
depends on NET_CLS_ACT
help
Say Y here to change skb priority or queue_mapping settings.
If unsure, say N.
To compile this code as a module, choose M here: the
module will be called act_skbedit.
config NET_ACT_CSUM
tristate "Checksum Updating"
depends on NET_CLS_ACT && INET
select LIBCRC32C
help
Say Y here to update some common checksum after some direct
packet alterations.
To compile this code as a module, choose M here: the
module will be called act_csum.
config NET_ACT_MPLS
tristate "MPLS manipulation"
depends on NET_CLS_ACT
help
Say Y here to push or pop MPLS headers.
If unsure, say N.
To compile this code as a module, choose M here: the
module will be called act_mpls.
config NET_ACT_VLAN
tristate "Vlan manipulation"
depends on NET_CLS_ACT
help
Say Y here to push or pop vlan headers.
If unsure, say N.
To compile this code as a module, choose M here: the
module will be called act_vlan.
config NET_ACT_BPF
tristate "BPF based action"
depends on NET_CLS_ACT
help
Say Y here to execute BPF code on packets. The BPF code will decide
if the packet should be dropped or not.
If unsure, say N.
To compile this code as a module, choose M here: the
module will be called act_bpf.
config NET_ACT_CONNMARK
tristate "Netfilter Connection Mark Retriever"
depends on NET_CLS_ACT && NETFILTER
depends on NF_CONNTRACK && NF_CONNTRACK_MARK
help
Say Y here to allow retrieving of conn mark
If unsure, say N.
To compile this code as a module, choose M here: the
module will be called act_connmark.
config NET_ACT_CTINFO
tristate "Netfilter Connection Mark Actions"
depends on NET_CLS_ACT && NETFILTER
depends on NF_CONNTRACK && NF_CONNTRACK_MARK
help
Say Y here to allow transfer of a connmark stored information.
Current actions transfer connmark stored DSCP into
ipv4/v6 diffserv and/or to transfer connmark to packet
mark. Both are useful for restoring egress based marks
back onto ingress connections for qdisc priority mapping
purposes.
If unsure, say N.
To compile this code as a module, choose M here: the
module will be called act_ctinfo.
config NET_ACT_SKBMOD
tristate "skb data modification action"
depends on NET_CLS_ACT
help
Say Y here to allow modification of skb data
If unsure, say N.
To compile this code as a module, choose M here: the
module will be called act_skbmod.
config NET_ACT_IFE
tristate "Inter-FE action based on IETF ForCES InterFE LFB"
depends on NET_CLS_ACT
select NET_IFE
help
Say Y here to allow for sourcing and terminating metadata
For details refer to netdev01 paper:
"Distributing Linux Traffic Control Classifier-Action Subsystem"
Authors: Jamal Hadi Salim and Damascene M. Joachimpillai
To compile this code as a module, choose M here: the
module will be called act_ife.
config NET_ACT_TUNNEL_KEY
tristate "IP tunnel metadata manipulation"
depends on NET_CLS_ACT
help
Say Y here to set/release ip tunnel metadata.
If unsure, say N.
To compile this code as a module, choose M here: the
module will be called act_tunnel_key.
config NET_ACT_CT
tristate "connection tracking tc action"
depends on NET_CLS_ACT && NF_CONNTRACK && (!NF_NAT || NF_NAT) && NF_FLOW_TABLE
select NF_CONNTRACK_OVS
select NF_NAT_OVS if NF_NAT
help
Say Y here to allow sending the packets to conntrack module.
If unsure, say N.
To compile this code as a module, choose M here: the
module will be called act_ct.
config NET_ACT_GATE
tristate "Frame gate entry list control tc action"
depends on NET_CLS_ACT
help
Say Y here to allow to control the ingress flow to be passed at
specific time slot and be dropped at other specific time slot by
the gate entry list.
If unsure, say N.
To compile this code as a module, choose M here: the
module will be called act_gate.
config NET_IFE_SKBMARK
tristate "Support to encoding decoding skb mark on IFE action"
depends on NET_ACT_IFE
config NET_IFE_SKBPRIO
tristate "Support to encoding decoding skb prio on IFE action"
depends on NET_ACT_IFE
config NET_IFE_SKBTCINDEX
tristate "Support to encoding decoding skb tcindex on IFE action"
depends on NET_ACT_IFE
config NET_TC_SKB_EXT
bool "TC recirculation support"
depends on NET_CLS_ACT
select SKB_EXTENSIONS
help
Say Y here to allow tc chain misses to continue in OvS datapath in
the correct recirc_id, and hardware chain misses to continue in
the correct chain in tc software datapath.
Say N here if you won't be using tc<->ovs offload or tc chains offload.
endif # NET_SCHED
config NET_SCH_FIFO
bool
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