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* net: Fix inconsistent teardown and release of private netdev state.David S. Miller2017-06-071-3/+2Star
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Network devices can allocate reasources and private memory using netdev_ops->ndo_init(). However, the release of these resources can occur in one of two different places. Either netdev_ops->ndo_uninit() or netdev->destructor(). The decision of which operation frees the resources depends upon whether it is necessary for all netdev refs to be released before it is safe to perform the freeing. netdev_ops->ndo_uninit() presumably can occur right after the NETDEV_UNREGISTER notifier completes and the unicast and multicast address lists are flushed. netdev->destructor(), on the other hand, does not run until the netdev references all go away. Further complicating the situation is that netdev->destructor() almost universally does also a free_netdev(). This creates a problem for the logic in register_netdevice(). Because all callers of register_netdevice() manage the freeing of the netdev, and invoke free_netdev(dev) if register_netdevice() fails. If netdev_ops->ndo_init() succeeds, but something else fails inside of register_netdevice(), it does call ndo_ops->ndo_uninit(). But it is not able to invoke netdev->destructor(). This is because netdev->destructor() will do a free_netdev() and then the caller of register_netdevice() will do the same. However, this means that the resources that would normally be released by netdev->destructor() will not be. Over the years drivers have added local hacks to deal with this, by invoking their destructor parts by hand when register_netdevice() fails. Many drivers do not try to deal with this, and instead we have leaks. Let's close this hole by formalizing the distinction between what private things need to be freed up by netdev->destructor() and whether the driver needs unregister_netdevice() to perform the free_netdev(). netdev->priv_destructor() performs all actions to free up the private resources that used to be freed by netdev->destructor(), except for free_netdev(). netdev->needs_free_netdev is a boolean that indicates whether free_netdev() should be done at the end of unregister_netdevice(). Now, register_netdevice() can sanely release all resources after ndo_ops->ndo_init() succeeds, by invoking both ndo_ops->ndo_uninit() and netdev->priv_destructor(). And at the end of unregister_netdevice(), we invoke netdev->priv_destructor() and optionally call free_netdev(). Signed-off-by: David S. Miller <davem@davemloft.net>
* Merge tag 'batadv-next-for-davem-20170406' of ↵David S. Miller2017-04-0615-238/+413
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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>
| * batman-adv: Use net_device_stats from struct net_deviceTobias Klauser2017-04-053-7/+6Star
| | | | | | | | | | | | | | | | | | 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>
| * batman-adv: Group ethtool related code togetherSven Eckelmann2017-04-031-99/+92Star
| | | | | | | | | | | | | | | | | | | | | | 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>
| * batman-adv: Remove ethtool .get_settings stubSven Eckelmann2017-04-031-19/+0Star
| | | | | | | | | | | | | | | | | | | | | | | | | | | | 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>
| * batman-adv: Remove ethtool msglevel functionsSven Eckelmann2017-04-031-13/+0Star
| | | | | | | | | | | | | | | | | | | | 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>
| * batman-adv: Use ethtool helper to get link statusSven Eckelmann2017-04-031-7/+1Star
| | | | | | | | | | | | | | | | | | | | | | | | | | 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>
| * batman-adv: restructure rebroadcast counter into forw_packet APILinus Lüssing2017-03-266-5/+63
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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>
| * batman-adv: privatize forw_packet skb assignmentLinus Lüssing2017-03-263-18/+23
| | | | | | | | | | | | | | | | | | | | | | | | 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>
| * batman-adv: handle race condition for claims between gatewaysAndreas Pape2017-03-221-4/+16
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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>
| * batman-adv: changed debug messages for easier bla debuggingAndreas Pape2017-03-222-5/+15
| | | | | | | | | | | | | | | | | | | | | | | | | | 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>
| * batman-adv: drop unicast packets from other backbone gwAndreas Pape2017-03-221-3/+22
| | | | | | | | | | | | | | | | | | | | | | | | | | 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>
| * batman-adv: prevent duplication of ARP replies when DAT is usedAndreas Pape2017-03-221-0/+32
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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>
| * batman-adv: prevent multiple ARP replies sent by gateways if dat enabledAndreas Pape2017-03-223-0/+75
| | | | | | | | | | | | | | | | | | | | | | | | | | | | 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>
| * batman-adv: Omit unnecessary memset of netdev private dataTobias Klauser2017-03-171-4/+0Star
| | | | | | | | | | | | | | | | | | | | 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>
| * batman-adv: Use __func__ to add function names to messagesSven Eckelmann2017-03-171-3/+4
| | | | | | | | | | | | | | | | | | 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>
| * batman-adv: Convert BATADV_PRINT_VID macro to functionSven Eckelmann2017-03-164-42/+54
| | | | | | | | | | | | | | | | 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>
| * batman-adv: Fix possible side-effects in _batadv_dbgSven Eckelmann2017-03-161-2/+3
| | | | | | | | | | | | | | | | 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>
| * batman-adv: Fix unbalanced braces around else statementSven Eckelmann2017-03-161-2/+4
| | | | | | | | | | Signed-off-by: Sven Eckelmann <sven@narfation.org> Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>
| * batman-adv: Reduce preprocessor checks in multicast.cSven Eckelmann2017-03-161-7/+5Star
| | | | | | | | | | | | | | | | | | | | 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>
| * batman-adv: Start new development cycleSimon Wunderlich2017-03-161-1/+1
| | | | | | | | Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>
* | Merge tag 'batadv-net-for-davem-20170316' of git://git.open-mesh.org/linux-mergeDavid S. Miller2017-03-166-11/+42
|\ \ | |/ |/| | | | | | | | | | | | | | | | | | | | | | | | | | | 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>
| * batman-adv: Initialize gw sel_class via batadv_algoSven Eckelmann2017-03-045-4/+29
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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: 50164d8f500f ("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>
| * batman-adv: Keep fragments equally sizedSven Eckelmann2017-03-041-7/+13
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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: ee75ed88879a ("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>
* | Merge tag 'mac80211-for-davem-2017-03-02' of ↵David S. Miller2017-03-021-1/+1
|\ \ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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>
| * | average: change to declare precision, not factorJohannes Berg2017-03-021-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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>
* | | Merge tag 'batadv-net-for-davem-20170301' of git://git.open-mesh.org/linux-mergeDavid S. Miller2017-03-021-9/+11
|\ \ \ | |/ / |/| / | |/ | | | | | | | | | | | | | | | | | | | | | | | | 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>
| * batman-adv: Fix transmission of final, 16th fragmentLinus Lüssing2017-02-211-6/+6
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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: ee75ed88879a ("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>
| * batman-adv: Fix double free during fragment merge errorSven Eckelmann2017-02-211-3/+5
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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: 610bfc6bc99b ("batman-adv: Receive fragmented packets and merge") Signed-off-by: Sven Eckelmann <sven@narfation.org> Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>
* | Merge tag 'batadv-next-for-davem-20170128' of ↵David S. Miller2017-01-303-3/+5
|\ \ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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>
| * | batman-adv: Fix includes for IS_ERR/ERR_PTRSven Eckelmann2017-01-282-2/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | 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>
| * | batman-adv: Fix double call of dev_queue_xmitSven Eckelmann2017-01-281-1/+3
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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: c33705188c49 ("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>
* | | Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/netDavid S. Miller2017-01-281-5/+5
|\ \ \ | | |/ | |/| | | | | | | | | | Two trivial overlapping changes conflicts in MPLS and mlx5. Signed-off-by: David S. Miller <davem@davemloft.net>
| * | batman-adv: Decrease hardif refcnt on fragmentation send errorSven Eckelmann2017-01-041-5/+5
| | | | | | | | | | | | | | | | | | | | | | | | | | | 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: 8def0be82dd1 ("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>
* | | Merge tag 'batadv-next-for-davem-20170126' of ↵David S. Miller2017-01-2659-69/+85
|\ \ \ | | |/ | |/| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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>
| * | batman-adv: Treat NET_XMIT_CN as transmit successfullyGao Feng2017-01-261-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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>
| * | batman-adv: Remove one condition check in batadv_route_unicast_packetGao Feng2017-01-261-5/+4Star
| | | | | | | | | | | | | | | | | | | | | | | | | | | 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>
| * | batman-adv: Remove unused variable in batadv_tt_local_set_flagsSven Eckelmann2017-01-261-2/+0Star
| | | | | | | | | | | | | | | Signed-off-by: Sven Eckelmann <sven@narfation.org> Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>
| * | batman-adv: update copyright years for 2017Sven Eckelmann2017-01-2659-59/+59
| | | | | | | | | | | | | | | Signed-off-by: Sven Eckelmann <sven@narfation.org> Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>
| * | batman-adv: don't add loop detect macs to TTSimon Wunderlich2017-01-262-1/+20
| | | | | | | | | | | | | | | | | | | | | | | | 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>
| * | batman-adv: Start new development cycleSimon Wunderlich2017-01-011-1/+1
| |/ | | | | | | Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>
* / net: Remove usage of net_device last_rx memberTobias Klauser2017-01-183-4/+0Star
|/ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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 9f242738376d ("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 4dc89133f49b ("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 f8ff080dacec ("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>
* Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/netDavid S. Miller2016-12-071-2/+2
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| * batman-adv: Check for alloc errors when preparing TT local dataSven Eckelmann2016-12-021-2/+2
| | | | | | | | | | | | | | | | | | | | | | | | 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: 7ea7b4a14275 ("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>
* | Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/netDavid S. Miller2016-11-222-0/+2
|\| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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>
| * batman-adv: Detect missing primaryif during tp_send as errorSven Eckelmann2016-11-041-0/+1
| | | | | | | | | | | | | | | | | | | | | | | | The throughput meter detects different situations as problems for the current test. It stops the test after these and reports it to userspace. This also has to be done when the primary interface disappeared during the test. Fixes: 33a3bb4a3345 ("batman-adv: throughput meter implementation") Reported-by: Joe Perches <joe@perches.com> Signed-off-by: Sven Eckelmann <sven@narfation.org> Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>
| * batman-adv: Revert "fix splat on disabling an interface"Sven Eckelmann2016-11-041-0/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The commit 9799c50372b2 ("batman-adv: fix splat on disabling an interface") fixed a warning but at the same time broke the rtnl function add_slave for devices which were temporarily removed. batadv_softif_slave_add requires soft_iface of and hard_iface to be NULL before it is allowed to be enslaved. But this resetting of soft_iface to NULL in batadv_hardif_disable_interface was removed with the aforementioned commit. Reported-by: Julian Labus <julian@freifunk-rtk.de> Signed-off-by: Sven Eckelmann <sven@narfation.org> Acked-by: Linus Lüssing <linus.luessing@c0d3.blue> Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>
* | Merge tag 'batadv-next-for-davem-20161119' of ↵David S. Miller2016-11-199-115/+445
|\ \ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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>
| * | batman-adv: fix rare race conditions on interface removalLinus Lüssing2016-11-084-82/+227
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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>
| * | batman-adv: Add module alias for batadv netlink familySven Eckelmann2016-11-081-0/+3
| | | | | | | | | | | | | | | | | | | | | | | | | | | 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>
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