- 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>
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>
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>
- 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>
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>
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>
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>
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>
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>
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>
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>
- 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>
- 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>
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>
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>
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>
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>
In a few situations batman-adv tries to determine whether a given interface
is a WiFi interface to enable specific WiFi optimizations. If the interface
batman-adv has been configured with is a virtual interface (e.g. VLAN) it
would not be properly detected as WiFi interface and thus not benefit from
the special WiFi treatment.
This patch changes that by peeking under the hood whenever a virtual
interface is in play.
Signed-off-by: Marek Lindner <mareklindner@neomailbox.ch>
[sven.eckelmann@open-mesh.com: integrate in wifi_flags caching, retrieve
namespace of link interface]
Signed-off-by: Sven Eckelmann <sven.eckelmann@open-mesh.com>
Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>
batman-adv is requiring the type of wifi device in different contexts. Some
of them can take the rtnl semaphore and some of them already have the
semaphore taken. But even others don't allow that the semaphore will be
taken.
The data has to be retrieved when the hardif is added to batman-adv because
some of the wifi information for an hardif will only be available with rtnl
lock. It can then be cached in the batadv_hard_iface and the functions
is_wifi_netdev and is_cfg80211_netdev can just compare the correct bits
without imposing extra locking requirements.
Signed-off-by: Sven Eckelmann <sven.eckelmann@open-mesh.com>
Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>
The ELP protocol requires cfg80211 to auto-detect the WiFi througput
to a given neighbor. Use batadv_is_cfg80211_netdev() to determine
whether or not an interface is eligible.
Signed-off-by: Marek Lindner <mareklindner@neomailbox.ch>
Signed-off-by: Sven Eckelmann <sven.eckelmann@open-mesh.com>
Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>
An unicast batman-adv packet cannot be transmitted to a multicast or zero
mac address. So reject incoming packets which still have these classes of
addresses as destination mac address in the outer ethernet header.
Signed-off-by: Sven Eckelmann <sven@narfation.org>
Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>
The returned net_namespace of batadv_getlink_net may be used with functions
that potentially modify the struct. Thus it must return the pointer as
non-const like rtnl_link_ops::get_link_net does.
Signed-off-by: Sven Eckelmann <sven.eckelmann@open-mesh.com>
Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>
The routing check for management frames is validating the source mac
address in the outer ethernet header. It rejects every source mac address
which is a broadcast address. But it also has to reject the zero-mac
address and multicast mac addresses.
Signed-off-by: Sven Eckelmann <sven@narfation.org>
Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>
The routing checks are validating the source mac address of the outer
ethernet header. They reject every source mac address which is a broadcast
address. But they also have to reject any multicast mac addresses.
Signed-off-by: Sven Eckelmann <sven@narfation.org>
[sw@simonwunderlich.de: fix commit message typo]
Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>
No caller of batadv_send_skb_to_orig is expecting the results to be -1
(-EPERM) anymore when the skbuff was not consumed. They will instead expect
that the skbuff is always consumed. Having such return code filter is
therefore not needed anymore.
Signed-off-by: Sven Eckelmann <sven@narfation.org>
Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>
Receiving functions in Linux consume the supplied skbuff. Doing the same in
the batadv_rx_handler functions makes the behavior more similar to the rest
of the Linux network code.
Signed-off-by: Sven Eckelmann <sven@narfation.org>
Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>
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: 33a3bb4a33 ("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>
The commit 9799c50372 ("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>
Mostly simple overlapping changes.
For example, David Ahern's adjacency list revamp in 'net-next'
conflicted with an adjacency list traversal bug fix in 'net'.
Signed-off-by: David S. Miller <davem@davemloft.net>
Sending functions in Linux consume the supplied skbuff. Doing the same in
batadv_send_skb_to_orig avoids the hack of returning -1 (-EPERM) to signal
the caller that he is responsible for cleaning up the skb.
Signed-off-by: Sven Eckelmann <sven@narfation.org>
Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>
Sending functions in Linux consume the supplied skbuff. Doing the same in
batadv_frag_send_packet avoids the hack of returning -1 (-EPERM) to signal
the caller that he is responsible for cleaning up the skb.
Signed-off-by: Sven Eckelmann <sven@narfation.org>
Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>
A failure during the submission also causes dropped packets.
batadv_interface_tx should therefore also increase the DROPPED counter for
these returns.
Signed-off-by: Sven Eckelmann <sven@narfation.org>
Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>
kfree_skb assumes that an skb is dropped after an failure and notes that.
consume_skb should be used in non-failure situations. Such information is
important for dropmonitor netlink which tells how many packets were dropped
and where this drop happened.
Signed-off-by: Sven Eckelmann <sven@narfation.org>
Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>
With this patch, (re)broadcasting on a specific interfaces is avoided:
* No neighbor: There is no need to broadcast on an interface if there
is no node behind it.
* Single neighbor is source: If there is just one neighbor on an
interface and if this neighbor is the one we actually got this
broadcast packet from, then we do not need to echo it back.
* Single neighbor is originator: If there is just one neighbor on
an interface and if this neighbor is the originator of this
broadcast packet, then we do not need to echo it back.
Goodies for BATMAN V:
("Upgrade your BATMAN IV network to V now to get these for free!")
Thanks to the split of OGMv1 into two packet types, OGMv2 and ELP
that is, we can now apply the same optimizations stated above to OGMv2
packets, too.
Furthermore, with BATMAN V, rebroadcasts can be reduced in certain
multi interface cases, too, where BATMAN IV cannot. This is thanks to
the removal of the "secondary interface originator" concept in BATMAN V.
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>
Instead of latching onto the OGM period, this patch introduces a worker
dedicated to multicast TT and TVLV updates.
The reasoning is, that upon roaming especially the translation table
should be updated timely to minimize connectivity issues.
With BATMAN V, the idea is to greatly increase the OGM interval to
reduce overhead. Unfortunately, right now this could lead to
a bad user experience if multicast traffic is involved.
Therefore this patch introduces a fixed 500ms update interval for
multicast TT entries and the multicast TVLV.
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>
During broadcast queueing, the skb_reset_mac_header() sets the skb
to a place invalid for a MAC header, pointing right into the
batman-adv broadcast packet. Luckily, no one seems to actually use
eth_hdr(skb) afterwards until batadv_send_skb_packet() resets the
header to a valid position again.
Therefore removing this unnecessary, weird skb_reset_mac_header()
call.
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>
batadv_mcast_mla_list_free() just frees some leftovers of a local feast
in batadv_mcast_mla_update(). No lockdep needed as it has nothing to do
with bat_priv->mcast.mla_list.
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>
The genl_ops don't need to be written by anyone and thus can be moved in a
ro memory range.
Signed-off-by: Sven Eckelmann <sven@narfation.org>
Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>
Fixes: 56989f6d85 ("genetlink: mark families as __ro_after_init")
Fixes: 2ae0f17df1 ("genetlink: use idr to track families")
Signed-off-by: Sven Eckelmann <sven@narfation.org>
Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>
order):
- bump version strings, by Simon Wunderlich
- README updates/clean up, by Sven Eckelmann (4 patches)
- Code clean up and restructuring by Sven Eckelmann (2 patches)
- Kerneldoc fix in forw_packet structure, by Linus Luessing
- Remove unused argument in dbg_arp, by Antonio Quartulli
- Add support to build batman-adv without wireless, by Linus Luessing
- Restructure error handling for is_ap_isolated, by Markus Elfring
- Remove unused initialization in various functions, by Sven Eckelmann
- Use better names for fragment and gateway list heads, by Sven
Eckelmann (2 patches)
- Convert to octal permissions for files, by Sven Eckelmann
- Avoid precedence issues for some macros, by Sven Eckelmann
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Merge tag 'batadv-next-for-davem-20161027' of git://git.open-mesh.org/linux-merge
Simon Wunderlich says:
====================
This code cleanup patchset includes the following changes (chronological
order):
- bump version strings, by Simon Wunderlich
- README updates/clean up, by Sven Eckelmann (4 patches)
- Code clean up and restructuring by Sven Eckelmann (2 patches)
- Kerneldoc fix in forw_packet structure, by Linus Luessing
- Remove unused argument in dbg_arp, by Antonio Quartulli
- Add support to build batman-adv without wireless, by Linus Luessing
- Restructure error handling for is_ap_isolated, by Markus Elfring
- Remove unused initialization in various functions, by Sven Eckelmann
- Use better names for fragment and gateway list heads, by Sven
Eckelmann (2 patches)
- Convert to octal permissions for files, by Sven Eckelmann
- Avoid precedence issues for some macros, by Sven Eckelmann
====================
Signed-off-by: David S. Miller <davem@davemloft.net>
Now genl_register_family() is the only thing (other than the
users themselves, perhaps, but I didn't find any doing that)
writing to the family struct.
In all families that I found, genl_register_family() is only
called from __init functions (some indirectly, in which case
I've add __init annotations to clarifly things), so all can
actually be marked __ro_after_init.
This protects the data structure from accidental corruption.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Instead of providing macros/inline functions to initialize
the families, make all users initialize them statically and
get rid of the macros.
This reduces the kernel code size by about 1.6k on x86-64
(with allyesconfig).
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Static family IDs have never really been used, the only
use case was the workaround I introduced for those users
that assumed their family ID was also their multicast
group ID.
Additionally, because static family IDs would never be
reserved by the generic netlink code, using a relatively
low ID would only work for built-in families that can be
registered immediately after generic netlink is started,
which is basically only the control family (apart from
the workaround code, which I also had to add code for so
it would reserve those IDs)
Thus, anything other than GENL_ID_GENERATE is flawed and
luckily not used except in the cases I mentioned. Move
those workarounds into a few lines of code, and then get
rid of GENL_ID_GENERATE entirely, making it more robust.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
