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1190 Commits

Author SHA1 Message Date
David S. Miller bd41486044 This feature/cleanup patchset includes the following patches:
- bump version strings, by Simon Wunderlich
 
  - Code and Style cleanups, by Sven Eckelmann (5 patches)
 
  - Remove an unneccessary memset, by Tobias Klauser
 
  - DAT and BLA optimizations for various corner cases, by Andreas Pape
    (5 patches)
 
  - forward/rebroadcast packet restructuring, by Linus Luessing
    (2 patches)
 
  - ethtool cleanup and remove unncessary code, by Sven Eckelmann
    (4 patches)
 
  - use net_device_stats from net_device instead of private copy,
    by Tobias Klauser
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Merge tag 'batadv-next-for-davem-20170406' of git://git.open-mesh.org/linux-merge

Simon Wunderlich says:

====================
This feature/cleanup patchset includes the following patches:

 - bump version strings, by Simon Wunderlich

 - Code and Style cleanups, by Sven Eckelmann (5 patches)

 - Remove an unneccessary memset, by Tobias Klauser

 - DAT and BLA optimizations for various corner cases, by Andreas Pape
   (5 patches)

 - forward/rebroadcast packet restructuring, by Linus Luessing
   (2 patches)

 - ethtool cleanup and remove unncessary code, by Sven Eckelmann
   (4 patches)

 - use net_device_stats from net_device instead of private copy,
   by Tobias Klauser
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
2017-04-06 14:37:50 -07:00
Tobias Klauser ab044f8e3e batman-adv: Use net_device_stats from struct net_device
Instead of using a private copy of struct net_device_stats in struct
batadv_priv, use stats from struct net_device.

Signed-off-by: Tobias Klauser <tklauser@distanz.ch>
Signed-off-by: Sven Eckelmann <sven@narfation.org>
Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>
2017-04-05 15:41:24 +02:00
Sven Eckelmann 5405e19e70 batman-adv: Group ethtool related code together
The ethtool code was spread in soft-interface.c. This makes reading the
code and working on it unnecessary complicated. Having everything in a
common place next to the other code which references it, makes it slightly
easier.

Signed-off-by: Sven Eckelmann <sven@narfation.org>
Acked-by: Marek Lindner <mareklindner@neomailbox.ch>
Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>
2017-04-03 12:58:29 +02:00
Sven Eckelmann e2790a4b27 batman-adv: Remove ethtool .get_settings stub
The .get_settings function pointer and the related API was deprecated.
Fortunately, batman-adv is a virtual interface and never provided any
useful information via .get_settings. The stub can therefore be
removed.

This also avoids that incorrect information is shown in ethtool about the
batadv interface.

Signed-off-by: Sven Eckelmann <sven@narfation.org>
Acked-by: Marek Lindner <mareklindner@neomailbox.ch>
Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>
2017-04-03 12:58:23 +02:00
Sven Eckelmann 40ad9842cb batman-adv: Remove ethtool msglevel functions
batadv devices don't support msglevel. The ethtool stubs therefore returned
that it isn't supported. But instead, the complete function can be dropped
to avoid that bogus values are shown in ethtool.

Signed-off-by: Sven Eckelmann <sven@narfation.org>
Acked-by: Marek Lindner <mareklindner@neomailbox.ch>
Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>
2017-04-03 12:58:17 +02:00
Sven Eckelmann 2f249e99c7 batman-adv: Use ethtool helper to get link status
The ethtool_ops of batman-adv never contained more than a stub for the
get_link function pointer. It was always returning that a link exists even
when the devices was not yet up and therefore nothing resampling a link
could have been available.

Instead use the ethtool helper which returns the current carrier state.

Signed-off-by: Sven Eckelmann <sven@narfation.org>
Acked-by: Marek Lindner <mareklindner@neomailbox.ch>
Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>
2017-04-03 12:57:06 +02:00
Linus Lüssing e2d9ba4355 batman-adv: restructure rebroadcast counter into forw_packet API
This patch refactors the num_packets counter of a forw_packet in the
following three ways:

1) Removed dual-use of forw_packet::num_packets:
   -> now for aggregation purposes only
2) Using forw_packet::skb::cb::num_bcasts instead:
   -> for easier access in aggregation code later
3) make access to num_bcasts private to batadv_forw_packet_*()

Signed-off-by: Linus Lüssing <linus.luessing@c0d3.blue>
[sven@narfation.org: Change num_bcasts to unsigned]
Signed-off-by: Sven Eckelmann <sven@narfation.org>
Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>
2017-03-26 12:46:44 +02:00
Linus Lüssing 99ba18ef02 batman-adv: privatize forw_packet skb assignment
An skb is assigned to a forw_packet only once, shortly after the
forw_packet allocation.

With this patch the assignment is moved into the this allocation
function.

Signed-off-by: Linus Lüssing <linus.luessing@c0d3.blue>
Signed-off-by: Sven Eckelmann <sven@narfation.org>
Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>
2017-03-26 12:46:44 +02:00
Andreas Pape a3a5129e12 batman-adv: handle race condition for claims between gateways
Consider the following situation which has been found in a test setup:
Gateway B has claimed client C and gateway A has the same backbone
network as B. C sends a broad- or multicast to B and directly after
this packet decides to send another packet to A due to a better TQ
value. B will forward the broad-/multicast into the backbone as it is
the responsible gw and after that A will claim C as it has been
chosen by C as the best gateway. If it now happens that A claims C
before it has received the broad-/multicast forwarded by B (due to
backbone topology or due to some delay in B when forwarding the
packet) we get a critical situation: in the current code A will
immediately unclaim C when receiving the multicast due to the
roaming client scenario although the position of C has not changed
in the mesh. If this happens the multi-/broadcast forwarded by B
will be sent back into the mesh by A and we have looping packets
until one of the gateways claims C again.
In order to prevent this, unclaiming of a client due to the roaming
client scenario is only done after a certain time is expired after
the last claim of the client. 100 ms are used here, which should be
slow enough for big backbones and slow gateways but fast enough not
to break the roaming client use case.

Acked-by: Simon Wunderlich <sw@simonwunderlich.de>
Signed-off-by: Andreas Pape <apape@phoenixcontact.com>
[sven@narfation.org: fix conflicts with current version]
Signed-off-by: Sven Eckelmann <sven@narfation.org>
Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>
2017-03-22 10:30:53 +01:00
Andreas Pape 4dd72f7360 batman-adv: changed debug messages for easier bla debugging
Some of the bla debug messages are extended and additional messages are
added for easier bla debugging. Some debug messages introduced with the
dat changes in prior patches of this patch series have been changed to
be more compliant to other existing debug messages.

Acked-by: Simon Wunderlich <sw@simonwunderlich.de>
Signed-off-by: Andreas Pape <apape@phoenixcontact.com>
[sven@narfation.org: fix conflicts with current version]
Signed-off-by: Sven Eckelmann <sven@narfation.org>
Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>
2017-03-22 10:30:53 +01:00
Andreas Pape 9e794b6bf4 batman-adv: drop unicast packets from other backbone gw
Additional dropping of unicast packets received from another backbone gw if
the same backbone network before being forwarded to the same backbone again
is necessary. It was observed in a test setup that in rare cases these
frames lead to looping unicast traffic backbone->mesh->backbone.

Signed-off-by: Andreas Pape <apape@phoenixcontact.com>
Acked-by: Simon Wunderlich <sw@simonwunderlich.de>
[sven@narfation.org: fix conflicts with current version]
Signed-off-by: Sven Eckelmann <sven@narfation.org>
Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>
2017-03-22 10:30:53 +01:00
Andreas Pape 9aa5cd79b5 batman-adv: prevent duplication of ARP replies when DAT is used
If none of the backbone gateways in a bla setup has already knowledge of
the mac address searched for in an incoming ARP request from the backbone
an address resolution via the DHT of DAT is started. The gateway can send
several ARP requests to different DHT nodes and therefore can get several
replies. This patch assures that not all of the possible ARP replies are
returned to the backbone by checking the local DAT cache of the gateway.
If there is an entry in the local cache the gateway has already learned
the requested address and there is no need to forward the additional reply
to the backbone.
Furthermore it is checked if this gateway has claimed the source of the ARP
reply and only forwards it to the backbone if it has claimed the source or
if there is no claim at all.

Signed-off-by: Andreas Pape <apape@phoenixcontact.com>
Acked-by: Simon Wunderlich <sw@simonwunderlich.de>
[sven@narfation.org: fix conflicts with current version]
Signed-off-by: Sven Eckelmann <sven@narfation.org>
Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>
2017-03-22 10:30:53 +01:00
Andreas Pape 00311de5fb batman-adv: prevent multiple ARP replies sent by gateways if dat enabled
If dat is enabled it must be made sure that only the backbone gw which has
claimed the remote destination for the ARP request answers the ARP request
directly if the MAC address is known due to the local dat table. This
prevents multiple ARP replies in a common backbone if more than one
gateway already knows the remote mac searched for in the ARP request.

Signed-off-by: Andreas Pape <apape@phoenixcontact.com>
Acked-by: Simon Wunderlich <sw@simonwunderlich.de>
[sven@narfation.org: fix conflicts with current version]
Signed-off-by: Sven Eckelmann <sven@narfation.org>
Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>
2017-03-22 10:30:53 +01:00
Tobias Klauser 13b0ea0f59 batman-adv: Omit unnecessary memset of netdev private data
The memory for netdev_priv is allocated using kzalloc in alloc_netdev
(or alloc_netdev_mq respectively) so there is no need to set it to 0
again.

Signed-off-by: Tobias Klauser <tklauser@distanz.ch>
Signed-off-by: Sven Eckelmann <sven@narfation.org>
Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>
2017-03-17 12:53:35 +01:00
Sven Eckelmann 4e09991af2 batman-adv: Use __func__ to add function names to messages
The name of the function might change in which these messages are printed.
It is therefore better to let the compiler handle the insertion of the
correct function name.

Signed-off-by: Sven Eckelmann <sven@narfation.org>
Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>
2017-03-17 12:53:35 +01:00
Sven Eckelmann f7a2bd6544 batman-adv: Convert BATADV_PRINT_VID macro to function
The BATADV_PRINT_VID is not free of of possible side-effects. This can be
avoided when the the macro is converted to a simple inline function.

Signed-off-by: Sven Eckelmann <sven@narfation.org>
Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>
2017-03-16 21:14:53 +01:00
Sven Eckelmann a09c94d07b batman-adv: Fix possible side-effects in _batadv_dbg
An argument of a macro should not be evaluated multiple times. Otherwise
embedded operations in these arguments will be executed multiple times.

Signed-off-by: Sven Eckelmann <sven@narfation.org>
Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>
2017-03-16 21:14:52 +01:00
Sven Eckelmann 1fda4c0ac0 batman-adv: Fix unbalanced braces around else statement
Signed-off-by: Sven Eckelmann <sven@narfation.org>
Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>
2017-03-16 21:14:51 +01:00
Sven Eckelmann c1bacea053 batman-adv: Reduce preprocessor checks in multicast.c
It is not necessary to disable these code sections in case other kernel
features are disabled. Instead the IS_ENABLED tests can be added directly
in the code and the compiler can remove the unnecessary code parts during
its optimization run.

Signed-off-by: Sven Eckelmann <sven@narfation.org>
Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>
2017-03-16 21:14:50 +01:00
Simon Wunderlich b96a898188 batman-adv: Start new development cycle
Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>
2017-03-16 21:14:50 +01:00
David S. Miller b124f41332 Here are two batman-adv bugfixes:
- Keep fragments equally sized, avoids some problems with too small fragments,
    by Sven Eckelmann
 
  - Initialize gateway class correctly when BATMAN V is compiled in,
    by Sven Eckelmann
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Merge tag 'batadv-net-for-davem-20170316' of git://git.open-mesh.org/linux-merge

Simon Wunderlich says:

====================
Here are two batman-adv bugfixes:

 - Keep fragments equally sized, avoids some problems with too small fragments,
   by Sven Eckelmann

 - Initialize gateway class correctly when BATMAN V is compiled in,
   by Sven Eckelmann
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
2017-03-16 12:05:38 -07:00
Sven Eckelmann 1a9070ec91 batman-adv: Initialize gw sel_class via batadv_algo
The gateway selection class variable is shared between different algorithm
versions. But the interpretation of the content is algorithm specific. The
initialization is therefore also algorithm specific.

But this was implemented incorrectly and the initialization for BATMAN_V
always overwrote the value previously written for BATMAN_IV. This could
only be avoided when BATMAN_V was disabled during compile time.

Using a special batadv_algo hook for this initialization avoids this
problem.

Fixes: 50164d8f50 ("batman-adv: B.A.T.M.A.N. V - implement GW selection logic")
Signed-off-by: Sven Eckelmann <sven@narfation.org>
Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>
2017-03-04 17:32:06 +01:00
Sven Eckelmann 1c2bcc766b batman-adv: Keep fragments equally sized
The batman-adv fragmentation packets have the design problem that they
cannot be refragmented and cannot handle padding by the underlying link.
The latter often leads to problems when networks are incorrectly configured
and don't use a common MTU.

The sender could for example fragment a 1271 byte frame (plus external
ethernet header (14) and batadv unicast header (10)) to fit in a 1280 bytes
large MTU of the underlying link (max. 1294 byte frames). This would create
a 1294 bytes large frame (fragment 2) and a 55 bytes large frame
(fragment 1). The extra 54 bytes are the fragment header (20) added to each
fragment and the external ethernet header (14) for the second fragment.

Let us assume that the next hop is then not able to transport 1294 bytes to
its next hop. The 1294 byte large frame will be dropped but the 55 bytes
large fragment will still be forwarded to its destination.

Or let us assume that the underlying hardware requires that each frame has
a minimum size (e.g. 60 bytes). Then it will pad the 55 bytes frame to 60
bytes. The receiver of the 60 bytes frame will no longer be able to
correctly assemble the two frames together because it is not aware that 5
bytes of the 60 bytes frame are padding and don't belong to the reassembled
frame.

This can partly be avoided by splitting frames more equally. In this
example, the 675 and 674 bytes large fragment frames could both potentially
reach its destination without being too large or too small.

Reported-by: Martin Weinelt <martin@darmstadt.freifunk.net>
Fixes: ee75ed8887 ("batman-adv: Fragment and send skbs larger than mtu")
Signed-off-by: Sven Eckelmann <sven@narfation.org>
Acked-by: Linus Lüssing <linus.luessing@c0d3.blue>
Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>
2017-03-04 17:31:57 +01:00
David S. Miller 35576ee17f This contains just the average.h change in order to get it
into the tree before adding new users through -next trees.
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Merge tag 'mac80211-for-davem-2017-03-02' of git://git.kernel.org/pub/scm/linux/kernel/git/jberg/mac80211

Johannes Berg says:

====================
This contains just the average.h change in order to get it
into the tree before adding new users through -next trees.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
2017-03-02 14:39:17 -08:00
David S. Miller 6ab2b999e7 Here are two batman-adv bugfixes:
- fix a potential double free when fragment merges fail,
    by Sven Eckelmann
 
  - fix failing tranmission of the 16th (last) fragment if that exists,
    by Linus Lüssing
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Merge tag 'batadv-net-for-davem-20170301' of git://git.open-mesh.org/linux-merge

Simon Wunderlich says:

====================
Here are two batman-adv bugfixes:

 - fix a potential double free when fragment merges fail,
   by Sven Eckelmann

 - fix failing tranmission of the 16th (last) fragment if that exists,
   by Linus Lüssing
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
2017-03-02 13:16:08 -08:00
Johannes Berg eb1e011a14 average: change to declare precision, not factor
Declaring the factor is counter-intuitive, and people are prone
to using small(-ish) values even when that makes no sense.

Change the DECLARE_EWMA() macro to take the fractional precision,
in bits, rather than a factor, and update all users.

While at it, add some more documentation.

Acked-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
2017-03-02 08:32:46 +01:00
Linus Lüssing 51c6b429c0 batman-adv: Fix transmission of final, 16th fragment
Trying to split and transmit a unicast packet in 16 parts will fail for
the final fragment: After having sent the 15th one with a frag_packet.no
index of 14, we will increase the the index to 15 - and return with an
error code immediately, even though one more fragment is due for
transmission and allowed.

Fixing this issue by moving the check before incrementing the index.

While at it, adding an unlikely(), because the check is actually more of
an assertion.

Fixes: ee75ed8887 ("batman-adv: Fragment and send skbs larger than mtu")
Signed-off-by: Linus Lüssing <linus.luessing@c0d3.blue>
Signed-off-by: Sven Eckelmann <sven@narfation.org>
Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>
2017-02-21 18:33:35 +01:00
Sven Eckelmann 248e23b50e batman-adv: Fix double free during fragment merge error
The function batadv_frag_skb_buffer was supposed not to consume the skbuff
on errors. This was followed in the helper function
batadv_frag_insert_packet when the skb would potentially be inserted in the
fragment queue. But it could happen that the next helper function
batadv_frag_merge_packets would try to merge the fragments and fail. This
results in a kfree_skb of all the enqueued fragments (including the just
inserted one). batadv_recv_frag_packet would detect the error in
batadv_frag_skb_buffer and try to free the skb again.

The behavior of batadv_frag_skb_buffer (and its helper
batadv_frag_insert_packet) must therefore be changed to always consume the
skbuff to have a common behavior and avoid the double kfree_skb.

Fixes: 610bfc6bc9 ("batman-adv: Receive fragmented packets and merge")
Signed-off-by: Sven Eckelmann <sven@narfation.org>
Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>
2017-02-21 18:33:15 +01:00
David S. Miller 936f459bea Here are two fixes for batman-adv for net-next:
- fix double call of dev_queue_xmit(), caused by the recent introduction
    of net_xmit_eval(), by Sven Eckelmann
 
  - Fix includes for IS_ERR/ERR_PTR, by Sven Eckelmann
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Merge tag 'batadv-next-for-davem-20170128' of git://git.open-mesh.org/linux-merge

Simon Wunderlich says:

====================
Here are two fixes for batman-adv for net-next:

 - fix double call of dev_queue_xmit(), caused by the recent introduction
   of net_xmit_eval(), by Sven Eckelmann

 - Fix includes for IS_ERR/ERR_PTR, by Sven Eckelmann
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
2017-01-29 19:21:26 -05:00
David S. Miller 4e8f2fc1a5 Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
Two trivial overlapping changes conflicts in MPLS and mlx5.

Signed-off-by: David S. Miller <davem@davemloft.net>
2017-01-28 10:33:06 -05:00
Sven Eckelmann 3e7514afc7 batman-adv: Fix includes for IS_ERR/ERR_PTR
IS_ERR/ERR_PTR are not defined in linux/device.h but in linux/err.h. The
files using these macros therefore have to include the correct one.

Reported-by: Linus Luessing <linus.luessing@web.de>
Signed-off-by: Sven Eckelmann <sven@narfation.org>
Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>
2017-01-28 10:40:35 +01:00
Sven Eckelmann 7c946062b3 batman-adv: Fix double call of dev_queue_xmit
The net_xmit_eval has side effects because it is not making sure that e
isn't evaluated twice.

    #define net_xmit_eval(e)        ((e) == NET_XMIT_CN ? 0 : (e))

The code requested by David Miller [1]

    return net_xmit_eval(dev_queue_xmit(skb));

will get transformed into

    return ((dev_queue_xmit(skb)) == NET_XMIT_CN ? 0 : (dev_queue_xmit(skb)))

dev_queue_xmit will therefore be tried again (with an already consumed skb)
whenever the return code is not NET_XMIT_CN.

[1] https://lkml.kernel.org/r/20170125.225624.965229145391320056.davem@davemloft.net

Fixes: c33705188c ("batman-adv: Treat NET_XMIT_CN as transmit successfully")
Signed-off-by: Sven Eckelmann <sven@narfation.org>
Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>
2017-01-28 10:40:35 +01:00
David S. Miller 49b3eb7725 This feature/cleanup patchset includes the following patches:
- bump version strings, by Simon Wunderlich
 
  - ignore self-generated loop detect MAC addresses in translation table,
    by Simon Wunderlich
 
  - install uapi batman_adv.h header, by Sven Eckelmann
 
  - bump copyright years, by Sven Eckelmann
 
  - Remove an unused variable in translation table code, by Sven Eckelmann
 
  - Handle NET_XMIT_CN like NET_XMIT_SUCCESS (revised according to Davids
    suggestion), and a follow up code clean up, by Gao Feng (2 patches)
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Merge tag 'batadv-next-for-davem-20170126' of git://git.open-mesh.org/linux-merge

Simon Wunderlich says:

====================
This feature/cleanup patchset includes the following patches:

 - bump version strings, by Simon Wunderlich

 - ignore self-generated loop detect MAC addresses in translation table,
   by Simon Wunderlich

 - install uapi batman_adv.h header, by Sven Eckelmann

 - bump copyright years, by Sven Eckelmann

 - Remove an unused variable in translation table code, by Sven Eckelmann

 - Handle NET_XMIT_CN like NET_XMIT_SUCCESS (revised according to Davids
   suggestion), and a follow up code clean up, by Gao Feng (2 patches)
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
2017-01-26 14:31:08 -05:00
Gao Feng c33705188c batman-adv: Treat NET_XMIT_CN as transmit successfully
The tc could return NET_XMIT_CN as one congestion notification, but
it does not mean the packet is lost. Other modules like ipvlan,
macvlan, and others treat NET_XMIT_CN as success too.

So batman-adv should handle NET_XMIT_CN also as NET_XMIT_SUCCESS.

Signed-off-by: Gao Feng <gfree.wind@gmail.com>
[sven@narfation.org: Moved NET_XMIT_CN handling to batadv_send_skb_packet]
Signed-off-by: Sven Eckelmann <sven@narfation.org>
Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>
2017-01-26 08:41:18 +01:00
Gao Feng 0843f197c4 batman-adv: Remove one condition check in batadv_route_unicast_packet
It could decrease one condition check to collect some statements in the
first condition block.

Signed-off-by: Gao Feng <gfree.wind@gmail.com>
Signed-off-by: Sven Eckelmann <sven@narfation.org>
Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>
2017-01-26 08:37:01 +01:00
Sven Eckelmann 269cee6218 batman-adv: Remove unused variable in batadv_tt_local_set_flags
Signed-off-by: Sven Eckelmann <sven@narfation.org>
Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>
2017-01-26 08:34:20 +01:00
Sven Eckelmann ac79cbb96b batman-adv: update copyright years for 2017
Signed-off-by: Sven Eckelmann <sven@narfation.org>
Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>
2017-01-26 08:34:19 +01:00
Simon Wunderlich d3e9768ab9 batman-adv: don't add loop detect macs to TT
The bridge loop avoidance (BLA) feature of batman-adv sends packets to
probe for Mesh/LAN packet loops. Those packets are not sent by real
clients and should therefore not be added to the translation table (TT).

Signed-off-by: Simon Wunderlich <simon.wunderlich@open-mesh.com>
2017-01-26 08:34:18 +01:00
Tobias Klauser 4a7c972644 net: Remove usage of net_device last_rx member
The network stack no longer uses the last_rx member of struct net_device
since the bonding driver switched to use its own private last_rx in
commit 9f24273837 ("bonding: use last_arp_rx in slave_last_rx()").

However, some drivers still (ab)use the field for their own purposes and
some driver just update it without actually using it.

Previously, there was an accompanying comment for the last_rx member
added in commit 4dc89133f4 ("net: add a comment on netdev->last_rx")
which asked drivers not to update is, unless really needed. However,
this commend was removed in commit f8ff080dac ("bonding: remove
useless updating of slave->dev->last_rx"), so some drivers added later
on still did update last_rx.

Remove all usage of last_rx and switch three drivers (sky2, atp and
smc91c92_cs) which actually read and write it to use their own private
copy in netdev_priv.

Compile-tested with allyesconfig and allmodconfig on x86 and arm.

Cc: Eric Dumazet <eric.dumazet@gmail.com>
Cc: Jay Vosburgh <j.vosburgh@gmail.com>
Cc: Veaceslav Falico <vfalico@gmail.com>
Cc: Andy Gospodarek <andy@greyhouse.net>
Cc: Mirko Lindner <mlindner@marvell.com>
Cc: Stephen Hemminger <stephen@networkplumber.org>
Signed-off-by: Tobias Klauser <tklauser@distanz.ch>
Acked-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: Jay Vosburgh <jay.vosburgh@canonical.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2017-01-18 17:22:49 -05:00
Sven Eckelmann 4ea33ef0f9 batman-adv: Decrease hardif refcnt on fragmentation send error
An error before the hardif is found has to free the skb. But every error
after that has to free the skb + put the hard interface.

Fixes: 8def0be82d ("batman-adv: Consume skb in batadv_frag_send_packet")
Signed-off-by: Sven Eckelmann <sven@narfation.org>
Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>
2017-01-04 08:22:04 +01:00
Simon Wunderlich 32bcad4b7f batman-adv: Start new development cycle
Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>
2017-01-01 00:09:49 +01:00
David S. Miller c63d352f05 Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2016-12-06 21:33:19 -05:00
Sven Eckelmann c2d0f48a13 batman-adv: Check for alloc errors when preparing TT local data
batadv_tt_prepare_tvlv_local_data can fail to allocate the memory for the
new TVLV block. The caller is informed about this problem with the returned
length of 0. Not checking this value results in an invalid memory access
when either tt_data or tt_change is accessed.

Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Fixes: 7ea7b4a142 ("batman-adv: make the TT CRC logic VLAN specific")
Signed-off-by: Sven Eckelmann <sven@narfation.org>
Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>
2016-12-02 10:46:59 +01:00
David S. Miller f9aa9dc7d2 Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
All conflicts were simple overlapping changes except perhaps
for the Thunder driver.

That driver has a change_mtu method explicitly for sending
a message to the hardware.  If that fails it returns an
error.

Normally a driver doesn't need an ndo_change_mtu method becuase those
are usually just range changes, which are now handled generically.
But since this extra operation is needed in the Thunder driver, it has
to stay.

However, if the message send fails we have to restore the original
MTU before the change because the entire call chain expects that if
an error is thrown by ndo_change_mtu then the MTU did not change.
Therefore code is added to nicvf_change_mtu to remember the original
MTU, and to restore it upon nicvf_update_hw_max_frs() failue.

Signed-off-by: David S. Miller <davem@davemloft.net>
2016-11-22 13:27:16 -05:00
David S. Miller f463c99b20 This feature patchset includes the following changes:
- 6 patches adding functionality to detect a WiFi interface under
    other virtual interfaces, like VLANs. They introduce a cache for
    the detected the WiFi configuration to avoid RTNL locking in
    critical sections. Patches have been prepared by Marek Lindner
    and Sven Eckelmann
 
  - Enable automatic module loading for genl requests, by Sven Eckelmann
 
  - Fix a potential race condition on interface removal. This is not
    happening very often in practice, but requires bigger changes to fix,
    so we are sending this to net-next. By Linus Luessing
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Merge tag 'batadv-next-for-davem-20161119' of git://git.open-mesh.org/linux-merge

Simon Wunderlich says:

====================
This feature patchset includes the following changes:

 - 6 patches adding functionality to detect a WiFi interface under
   other virtual interfaces, like VLANs. They introduce a cache for
   the detected the WiFi configuration to avoid RTNL locking in
   critical sections. Patches have been prepared by Marek Lindner
   and Sven Eckelmann

 - Enable automatic module loading for genl requests, by Sven Eckelmann

 - Fix a potential race condition on interface removal. This is not
   happening very often in practice, but requires bigger changes to fix,
   so we are sending this to net-next. By Linus Luessing
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
2016-11-19 11:13:05 -05:00
David S. Miller d401c1d1e8 This feature and cleanup patchset includes the following changes:
- netlink and code cleanups by Sven Eckelmann (3 patches)
 
  - Cleanup and minor fixes by Linus Luessing (3 patches)
 
  - Speed up multicast update intervals, by Linus Luessing
 
  - Avoid (re)broadcast in meshes for some easy cases,
    by Linus Luessing
 
  - Clean up tx return state handling, by Sven Eckelmann (6 patches)
 
  - Fix some special mac address handling cases, by Sven Eckelmann
    (3 patches)
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Merge tag 'batadv-next-for-davem-20161108-v2' of git://git.open-mesh.org/linux-merge

Simon Wunderlich says:

====================
pull request for net-next: batman-adv 2016-11-08 v2

This feature and cleanup patchset includes the following changes:

 - netlink and code cleanups by Sven Eckelmann (3 patches)

 - Cleanup and minor fixes by Linus Luessing (3 patches)

 - Speed up multicast update intervals, by Linus Luessing

 - Avoid (re)broadcast in meshes for some easy cases,
   by Linus Luessing

 - Clean up tx return state handling, by Sven Eckelmann (6 patches)

 - Fix some special mac address handling cases, by Sven Eckelmann
   (3 patches)
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
2016-11-09 22:15:28 -05:00
Linus Lüssing 9b4aec647a batman-adv: fix rare race conditions on interface removal
In rare cases during shutdown the following general protection fault can
happen:

  general protection fault: 0000 [#1] SMP
  Modules linked in: batman_adv(O-) [...]
  CPU: 3 PID: 1714 Comm: rmmod Tainted: G           O    4.6.0-rc6+ #1
  [...]
  Call Trace:
   [<ffffffffa0363294>] batadv_hardif_disable_interface+0x29a/0x3a6 [batman_adv]
   [<ffffffffa0373db4>] batadv_softif_destroy_netlink+0x4b/0xa4 [batman_adv]
   [<ffffffff813b52f3>] __rtnl_link_unregister+0x48/0x92
   [<ffffffff813b9240>] rtnl_link_unregister+0xc1/0xdb
   [<ffffffff8108547c>] ? bit_waitqueue+0x87/0x87
   [<ffffffffa03850d2>] batadv_exit+0x1a/0xf48 [batman_adv]
   [<ffffffff810c26f9>] SyS_delete_module+0x136/0x1b0
   [<ffffffff8144dc65>] entry_SYSCALL_64_fastpath+0x18/0xa8
   [<ffffffff8108aaca>] ? trace_hardirqs_off_caller+0x37/0xa6
  Code: 89 f7 e8 21 bd 0d e1 4d 85 e4 75 0e 31 f6 48 c7 c7 50 d7 3b a0 e8 50 16 f2 e0 49 8b 9c 24 28 01 00 00 48 85 db 0f 84 b2 00 00 00 <48> 8b 03 4d 85 ed 48 89 45 c8 74 09 4c 39 ab f8 00 00 00 75 1c
  RIP  [<ffffffffa0371852>] batadv_purge_outstanding_packets+0x1c8/0x291 [batman_adv]
   RSP <ffff88001da5fd78>
  ---[ end trace 803b9bdc6a4a952b ]---
  Kernel panic - not syncing: Fatal exception in interrupt
  Kernel Offset: disabled
  ---[ end Kernel panic - not syncing: Fatal exception in interrupt

It does not happen often, but may potentially happen when frequently
shutting down and reinitializing an interface. With some carefully
placed msleep()s/mdelay()s it can be reproduced easily.

The issue is, that on interface removal, any still running worker thread
of a forwarding packet will race with the interface purging routine to
free a forwarding packet. Temporarily giving up a spin-lock to be able
to sleep in the purging routine is not safe.

Furthermore, there is a potential general protection fault not just for
the purging side shown above, but also on the worker side: Temporarily
removing a forw_packet from the according forw_{bcast,bat}_list will make
it impossible for the purging routine to catch and cancel it.

 # How this patch tries to fix it:

With this patch we split the queue purging into three steps: Step 1),
removing forward packets from the queue of an interface and by that
claim it as our responsibility to free.

Step 2), we are either lucky to cancel a pending worker before it starts
to run. Or if it is already running, we wait and let it do its thing,
except two things:

Through the claiming in step 1) we prevent workers from a) re-arming
themselves. And b) prevent workers from freeing packets which we still
hold in the interface purging routine.

Finally, step 3, we are sure that no forwarding packets are pending or
even running anymore on the interface to remove. We can then safely free
the claimed forwarding packets.

Signed-off-by: Linus Lüssing <linus.luessing@c0d3.blue>
Signed-off-by: Sven Eckelmann <sven@narfation.org>
Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>
2016-11-08 19:02:39 +01:00
Sven Eckelmann 2c0c06ff44 batman-adv: Add module alias for batadv netlink family
The batman-adv module has to be loaded to fulfill genl request by the
userspace. When it is not loaded then requests will fail. It is therefore
useful to get the module automatically loaded when such a request is made.

Signed-off-by: Sven Eckelmann <sven@narfation.org>
Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>
2016-11-08 19:02:39 +01:00
Sven Eckelmann ee3b5e9fe8 batman-adv: Update wifi flags on upper link change
Things like VLANs don't have their link set when they are created. Thus
the wifi flags have to be evaluated later to fix their contents for the
link interface.

Signed-off-by: Sven Eckelmann <sven.eckelmann@open-mesh.com>
Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>
2016-11-08 19:02:38 +01:00
Marek Lindner 1942de1bba batman-adv: retrieve B.A.T.M.A.N. V WiFi neighbor stats from real interface
Signed-off-by: Marek Lindner <mareklindner@neomailbox.ch>
[sven.eckelmann@open-mesh.com: re-add batadv_get_real_netdev to take rtnl
 semaphore for batadv_get_real_netdevice]
Signed-off-by: Sven Eckelmann <sven.eckelmann@open-mesh.com>
Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>
2016-11-08 19:02:38 +01:00