Commit graph

132 commits

Author SHA1 Message Date
Stephen Hemminger
781b456a98 [MAINTAINERS]: Add proper entry for TC classifier
Acked-by: Jamal Hadi Salim <hadi@cyberus.ca>
Signed-off-by: David S. Miller <davem@davemloft.net>
2006-07-12 13:58:48 -07:00
Thomas Graf
ebbaeab18b [PKT_SCHED]: act_api: Fix module leak while flushing actions
Module reference needs to be given back if message header
construction fails.

Signed-off-by: Thomas Graf <tgraf@suug.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
2006-07-09 11:36:23 -07:00
Thomas Graf
4fe683f50d [PKT_SCHED]: Fix error handling while dumping actions
"return -err" and blindly inheriting the error code in the netlink
failure exception handler causes errors codes to be returned as
positive value therefore making them being ignored by the caller.

May lead to sending out incomplete netlink messages.

Signed-off-by: Thomas Graf <tgraf@suug.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
2006-07-05 20:47:28 -07:00
Thomas Graf
d152b4e1e9 [PKT_SCHED]: Return ENOENT if action module is unavailable
Signed-off-by: Thomas Graf <tgraf@suug.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
2006-07-05 20:45:57 -07:00
Thomas Graf
26dab8930b [PKT_SCHED]: Fix illegal memory dereferences when dumping actions
The TCA_ACT_KIND attribute is used without checking its
availability when dumping actions therefore leading to a
value of 0x4 being dereferenced.

The use of strcmp() in tc_lookup_action_n() isn't safe
when fed with string from an attribute without enforcing
proper NUL termination.

Both bugs can be triggered with malformed netlink message
and don't require any privileges.

Signed-off-by: Thomas Graf <tgraf@suug.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
2006-07-05 20:45:06 -07:00
Jörn Engel
6ab3d5624e Remove obsolete #include <linux/config.h>
Signed-off-by: Jörn Engel <joern@wohnheim.fh-wedel.de>
Signed-off-by: Adrian Bunk <bunk@stusta.de>
2006-06-30 19:25:36 +02:00
Matt LaPlante
3539c272f1 Kconfig: Typos in net/sched/Kconfig
Signed-off-by: Adrian Bunk <bunk@stusta.de>
2006-06-30 18:53:46 +02:00
Herbert Xu
f6a78bfcb1 [NET]: Add generic segmentation offload
This patch adds the infrastructure for generic segmentation offload.
The idea is to tap into the potential savings of TSO without hardware
support by postponing the allocation of segmented skb's until just
before the entry point into the NIC driver.

The same structure can be used to support software IPv6 TSO, as well as
UFO and segmentation offload for other relevant protocols, e.g., DCCP.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
2006-06-23 02:07:31 -07:00
Herbert Xu
d4828d85d1 [NET]: Prevent transmission after dev_deactivate
The dev_deactivate function has bit-rotted since the introduction of
lockless drivers.  In particular, the spin_unlock_wait call at the end
has no effect on the xmit routine of lockless drivers.

With a little bit of work, we can make it much more useful by providing
the guarantee that when it returns, no more calls to the xmit routine
of the underlying driver will be made.

The idea is simple.  There are two entry points in to the xmit routine.
The first comes from dev_queue_xmit.  That one is easily stopped by
using synchronize_rcu.  This works because we set the qdisc to noop_qdisc
before the synchronize_rcu call.  That in turn causes all subsequent
packets sent to dev_queue_xmit to be dropped.  The synchronize_rcu call
also ensures all outstanding calls leave their critical section.

The other entry point is from qdisc_run.  Since we now have a bit that
indicates whether it's running, all we have to do is to wait until the
bit is off.

I've removed the loop to wait for __LINK_STATE_SCHED to clear.  This is
useless because netif_wake_queue can cause it to be set again.  It is
also harmless because we've disarmed qdisc_run.

I've also removed the spin_unlock_wait on xmit_lock because its only
purpose of making sure that all outstanding xmit_lock holders have
exited is also given by dev_watchdog_down.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
2006-06-23 02:07:26 -07:00
Herbert Xu
48d83325b6 [NET]: Prevent multiple qdisc runs
Having two or more qdisc_run's contend against each other is bad because
it can induce packet reordering if the packets have to be requeued.  It
appears that this is an unintended consequence of relinquinshing the queue
lock while transmitting.  That in turn is needed for devices that spend a
lot of time in their transmit routine.

There are no advantages to be had as devices with queues are inherently
single-threaded (the loopback device is not but then it doesn't have a
queue).

Even if you were to add a queue to a parallel virtual device (e.g., bolt
a tbf filter in front of an ipip tunnel device), you would still want to
process the queue in sequence to ensure that the packets are ordered
correctly.

The solution here is to steal a bit from net_device to prevent this.

BTW, as qdisc_restart is no longer used by anyone as a module inside the
kernel (IIRC it used to with netif_wake_queue), I have not exported the
new __qdisc_run function.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
2006-06-19 23:57:59 -07:00
Herbert Xu
932ff279a4 [NET]: Add netif_tx_lock
Various drivers use xmit_lock internally to synchronise with their
transmission routines.  They do so without setting xmit_lock_owner.
This is fine as long as netpoll is not in use.

With netpoll it is possible for deadlocks to occur if xmit_lock_owner
isn't set.  This is because if a printk occurs while xmit_lock is held
and xmit_lock_owner is not set can cause netpoll to attempt to take
xmit_lock recursively.

While it is possible to resolve this by getting netpoll to use
trylock, it is suboptimal because netpoll's sole objective is to
maximise the chance of getting the printk out on the wire.  So
delaying or dropping the message is to be avoided as much as possible.

So the only alternative is to always set xmit_lock_owner.  The
following patch does this by introducing the netif_tx_lock family of
functions that take care of setting/unsetting xmit_lock_owner.

I renamed xmit_lock to _xmit_lock to indicate that it should not be
used directly.  I didn't provide irq versions of the netif_tx_lock
functions since xmit_lock is meant to be a BH-disabling lock.

This is pretty much a straight text substitution except for a small
bug fix in winbond.  It currently uses
netif_stop_queue/spin_unlock_wait to stop transmission.  This is
unsafe as an IRQ can potentially wake up the queue.  So it is safer to
use netif_tx_disable.

The hamradio bits used spin_lock_irq but it is unnecessary as
xmit_lock must never be taken in an IRQ handler.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
2006-06-17 21:30:14 -07:00
Stephen Hemminger
338f7566e5 [PKT_SCHED]: Potential jiffy wrap bug in dev_watchdog().
There is a potential jiffy wraparound bug in the transmit watchdog
that is easily avoided by using time_after().

Signed-off-by: Stephen Hemminger <shemminger@osdl.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
2006-05-16 15:02:12 -07:00
Patrick McHardy
210525d65d [NET_SCHED]: HFSC: fix thinko in hfsc_adjust_levels()
When deleting the last child the level of a class should drop to zero.

Noticed by Andreas Mueller <andreas@stapelspeicher.org>

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
2006-05-11 12:22:03 -07:00
Stephen Hemminger
89bbb0a361 [PKT_SCHED] netem: fix loss
The following one line fix is needed to make loss function of
netem work right when doing loss on the local host.
Otherwise, higher layers just recover.

Signed-off-by: Stephen Hemminger <shemminger@osdl.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
2006-04-29 18:33:12 -07:00
Patrick McHardy
18118cdbfd [NETFILTER]: ipt action: use xt_check_target for basic verification
The targets don't do the basic verification themselves anymore so
the ipt action needs to take care of it.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
2006-04-24 17:27:34 -07:00
Jamal Hadi Salim
83b950c89c [PKT_SCHED] act_police: Rename methods.
Rename policer specific _generic_ methods to be specific to
_act_police_

Signed-off-by: Jamal Hadi Salim <hadi@cyberus.ca>
Signed-off-by: David S. Miller <davem@davemloft.net>
2006-04-09 22:25:46 -07:00
Patrick McHardy
1ae39a430b [NET_SCHED]: cls_u32: remove unnecessary NULL-ptr check
In both cases n can't be NULL without crashing anyway.

Coverity #78

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
2006-03-23 01:16:48 -08:00
Adrian Bunk
afb5bb5744 [PKT_SCHED]: Let NET_CLS_ACT no longer depend on EXPERIMENTAL
This option should IMHO no longer depend on EXPERIMENTAL.

Signed-off-by: Adrian Bunk <bunk@stusta.de>
ACKed-by: Jamal Hadi Salim <hadi@cyberus.ca>
Signed-off-by: David S. Miller <davem@davemloft.net>
2006-03-20 22:44:24 -08:00
Stephen Hemminger
1533306186 [NET]: dev_put/dev_hold cleanup
Get rid of the old __dev_put macro that is just a hold over from pre 2.6
kernel.  And turn dev_hold into an inline instead of a macro.

Signed-off-by: Stephen Hemminger <shemminger@osdl.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
2006-03-20 22:32:28 -08:00
Patrick McHardy
f38c39d6ce [PKT_SCHED]: Convert sch_red to a classful qdisc
Convert sch_red to a classful qdisc. All qdiscs that maintain accurate
backlog counters are eligible as child qdiscs. When a queue limit larger
than zero is given, a bfifo qdisc is used for backwards compatibility.
Current versions of tc enforce a limit larger than zero, other users
can avoid creating the default qdisc by using zero.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Acked-by: Jamal Hadi Salim <hadi@cyberus.ca>
Signed-off-by: David S. Miller <davem@davemloft.net>
2006-03-20 19:20:44 -08:00
Patrick McHardy
f5539eb8ca [PKT_SCHED]: Keep backlog counter in sch_sfq
Keep backlog counter in SFQ qdisc to make it usable as child qdisc
with RED.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
2006-03-20 19:01:38 -08:00
Patrick McHardy
053cfed75d [PKT_SCHED]: Restore TBF change semantic
When TBF was converted to a classful qdisc, the semantic of the limit
parameter was broken. On initilization an inner bfifo qdisc is created
for backwards compatibility, when changing parameters however the new
limit is ignored and the current child qdisc remains in place.

Always replace the child qdisc by the default bfifo when limit is above
zero, otherwise don't touch the inner qdisc. Current tc version enforce
a limit above zero, other users can avoid creating the inner qdisc by
using zero.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
2006-03-20 19:01:21 -08:00
Patrick McHardy
cdc7f8e362 [PKT_SCHED]: Dump child qdisc handle in sch_{atm,dsmark}
A qdisc should set tcm_info to the child qdisc handle in its class
dump function.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
2006-03-20 19:01:06 -08:00
Patrick McHardy
6d037a26f0 [PKT_SCHED]: Qdisc drop operation is optional
The drop operation is optional and qdiscs must check if childs support it.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
2006-03-20 19:00:49 -08:00
Patrick McHardy
1c524830d0 [NETFILTER]: x_tables: pass registered match/target data to match/target functions
This allows to make decisions based on the revision (and address family
with a follow-up patch) at runtime.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
2006-03-20 18:02:15 -08:00
Patrick McHardy
f6e57464df [NET_SCHED]: act_api: fix skb leak in error path
The skb is allocated by the function, so it needs to be freed instead
of trimmed on overrun.

Coverity #614

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
2006-03-12 20:39:36 -08:00
Patrick McHardy
ae82af54d7 [PKT_SCHED]: Handle SCTP/DCCP in sfq_hash
Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
2006-01-17 13:01:06 -08:00
Amnon Aaronsohn
dd914b4082 [PKT_SCHED] sch_prio: fix qdisc bands init
Currently when PRIO is configured to use N bands, it lets the packets be
directed to any of the bands 0..N-1. However, PRIO attaches a fifo qdisc
only to the bands that appear in the priomap; the rest of the N bands
remain with a noop qdisc attached. This patch changes PRIO's behavior so
that it attaches a fifo qdisc to all of the N bands.

Signed-off-by: Amnon Aaronsohn <bla@cs.huji.ac.il>
Signed-off-by: David S. Miller <davem@davemloft.net>
2006-01-17 02:24:26 -08:00
Patrick McHardy
dca80b962a [PKT_SCHED]: Change default clock source to gettimeofday
The default of using jiffies is very bad and results in
underutilization except with very low bandwidth.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
2006-01-13 14:36:55 -08:00
Harald Welte
2e4e6a17af [NETFILTER] x_tables: Abstraction layer for {ip,ip6,arp}_tables
This monster-patch tries to do the best job for unifying the data
structures and backend interfaces for the three evil clones ip_tables,
ip6_tables and arp_tables.  In an ideal world we would never have
allowed this kind of copy+paste programming... but well, our world
isn't (yet?) ideal.

o introduce a new x_tables module
o {ip,arp,ip6}_tables depend on this x_tables module
o registration functions for tables, matches and targets are only
  wrappers around x_tables provided functions
o all matches/targets that are used from ip_tables and ip6_tables
  are now implemented as xt_FOOBAR.c files and provide module aliases
  to ipt_FOOBAR and ip6t_FOOBAR
o header files for xt_matches are in include/linux/netfilter/,
  include/linux/netfilter_{ipv4,ipv6} contains compatibility wrappers
  around the xt_FOOBAR.h headers

Based on this patchset we're going to further unify the code,
gradually getting rid of all the layer 3 specific assumptions.

Signed-off-by: Harald Welte <laforge@netfilter.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
2006-01-12 14:06:43 -08:00
Adrian Bunk
bb7e8c5a55 [PKT_SCHED] net/sched/Kconfig: fix typo in NET_EMATCH_META description
Noted by Matt LaPlante <webmaster@cyberdogtech.com>.

Signed-off-by: Adrian Bunk <bunk@stusta.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
2006-01-11 16:40:30 -08:00
Evgeniy Polyakov
54608b7099 [PKT_SCHED] ematch: Remove bogus include.
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
2006-01-11 16:32:16 -08:00
Jamal Hadi Salim
29f1df6cc1 [PKT_SCHED]: Fix qdisc return code.
The mapping between TC_ACTION_SHOT and the qdisc return codes is better
suited to NET_XMIT_BYPASS so as not to confuse TCP

Signed-off-by: Jamal Hadi Salim <hadi@cyberus.ca>
Signed-off-by: David S. Miller <davem@davemloft.net>
2006-01-09 14:16:26 -08:00
Patrick McHardy
4bba392592 [PKT_SCHED]: Prefix tc actions with act_
Clean up the net/sched directory a bit by prefix all actions with act_.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
2006-01-09 14:16:14 -08:00
Patrick McHardy
541673c859 [PKT_SCHED]: Fix memory leak when dumping in pedit action
Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
2006-01-09 14:16:12 -08:00
Patrick McHardy
31bd06eb33 [PKT_SCHED]: Remove some obsolete policer exports
Also make sure the legacy code is only built when CONFIG_NET_CLS_ACT
is not set.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
2006-01-09 14:16:10 -08:00
Patrick McHardy
f43c5a0df3 [PKT_SCHED]: Convert tc action functions to single skb pointers
tcf_action_exec only gets a single skb pointer and doesn't own the skb,
but passes double skb pointers (to a local variable) to the action
functions. Change to use single skb pointers everywhere.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
2006-01-09 14:16:08 -08:00
Patrick McHardy
538e43a4bd [PKT_SCHED]: Use USEC_PER_SEC
Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
2006-01-09 14:16:05 -08:00
Patrick McHardy
2941a48631 [NET]: Convert net/{ipv4,ipv6,sched} to netdev_priv
Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
2006-01-09 14:16:03 -08:00
Arnaldo Carvalho de Melo
14c850212e [INET_SOCK]: Move struct inet_sock & helper functions to net/inet_sock.h
To help in reducing the number of include dependencies, several files were
touched as they were getting needed headers indirectly for stuff they use.

Thanks also to Alan Menegotto for pointing out that net/dccp/proto.c had
linux/dccp.h include twice.

Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2006-01-03 13:11:21 -08:00
Stephen Hemminger
c865e5d99e [PKT_SCHED] netem: packet corruption option
Here is a new feature for netem in 2.6.16. It adds the ability to
randomly corrupt packets with netem. A version was done by
Hagen Paul Pfeifer, but I redid it to handle the cases of backwards
compatibility with netlink interface and presence of hardware checksum
offload. It is useful for testing hardware offload in devices.

Signed-off-by: Stephen Hemminger <shemminger@osdl.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
2006-01-03 13:11:05 -08:00
David S. Miller
2edc2689f8 [PKT_SCHED]: Disable debug tracing logs by default in packet action API.
Noticed by Andi Kleen.

Signed-off-by: David S. Miller <davem@davemloft.net>
2005-12-13 22:59:50 -08:00
Andrea Bittau
aa8751667d [PKT_SCHED]: sch_netem: correctly order packets to be sent simultaneously
If two packets were queued to be sent at the same time in the future,
their order would be reversed.  This would occur because the queue is
traversed back to front, and a position is found by checking whether
the new packet needs to be sent before the packet being examined.  If
the new packet is to be sent at the same time of a previous packet, it
would end up before the old packet in the queue.  This patch places
packets in the correct order when they are queued to be sent at a same
time in the future.

Signed-off-by: Andrea Bittau <a.bittau@cs.ucl.ac.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>
2005-11-20 13:41:05 -08:00
Roman Zippel
05b8b0fafd [NET]: Sanitize NET_SCHED protection in /net/sched/Kconfig
On Thu, 17 Nov 2005, David Gmez wrote:

> I found out that if i select NET_CLS_ROUTE4, save my changes and exit
> menuconfig, execute again make menuconfig and go to QoS options, then the new
> available options are visible. So menuconfig has some problem refreshing
> contents :?

No, they were there before too, but you have to go up one level to see 
them.

It's better in 2.6.15-rc1-git5, but the menu structure is still a little 
messed up, the patch below properly indents all menu entries.

Signed-off-by: Roman Zippel <zippel@linux-m68k.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
2005-11-17 15:22:39 -08:00
Jesper Juhl
a51482bde2 [NET]: kfree cleanup
From: Jesper Juhl <jesper.juhl@gmail.com>

This is the net/ part of the big kfree cleanup patch.

Remove pointless checks for NULL prior to calling kfree() in net/.

Signed-off-by: Jesper Juhl <jesper.juhl@gmail.com>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Arnaldo Carvalho de Melo <acme@conectiva.com.br>
Acked-by: Marcel Holtmann <marcel@holtmann.org>
Acked-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
2005-11-08 09:41:34 -08:00
Thomas Graf
b541ca2c5a [PKT_SCHED]: Correctly handle empty ematch trees
Fixes an invalid memory reference when the basic classifier
is used without any ematches but just actions.

Signed-off-by: Thomas Graf <tgraf@suug.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
2005-11-08 09:39:17 -08:00
Arnaldo Carvalho de Melo
2d43f1128a Merge branch 'red' of 84.73.165.173:/home/tgr/repos/net-2.6 2005-11-05 22:30:29 -02:00
Stephen Hemminger
eb229c4cdc [NETEM]: Add version string
Add a version string to help support issues.

Signed-off-by: Stephen Hemminger <shemminger@osdl.org>
Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>
2005-11-05 20:59:21 -02:00
Stephen Hemminger
300ce174eb [NETEM]: Support time based reordering
Change netem to support packets getting reordered because of variations in
delay. Introduce a special case version of FIFO that queues packets in order
based on the netem delay.

Since netem is classful, those users that don't want jitter based reordering
can just insert a pfifo instead of the default.

This required changes to generic skbuff code to allow finer grain manipulation
of sk_buff_head.  Insertion into the middle and reverse walk.

Signed-off-by: Stephen Hemminger <shemminger@osdl.org>
Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>
2005-11-05 20:56:41 -02:00
Thomas Graf
bdc450a0bb [PKT_SCHED]: (G)RED: Introduce hard dropping
Introduces a new flag TC_RED_HARDDROP which specifies that if ECN
marking is enabled packets should still be dropped once the
average queue length exceeds the maximum threshold.

This _may_ help to avoid global synchronisation during small
bursts of peers advertising but not caring about ECN. Use this
option very carefully, it does more harm than good if
(qth_max - qth_min) does not cover at least two average burst
cycles.

The difference to the current behaviour, in which we'd run into
the hard queue limit, is that due to the low pass filter of RED
short bursts are less likely to cause a global synchronisation.

Signed-off-by: Thomas Graf <tgraf@suug.ch>
Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>
2005-11-05 22:02:29 +01:00