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This patch increments the management interface revision due to
introduction of new multi-advertising feature and various bug fixes.
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
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Now that the obsolete adv_instance is no longer being referenced
anywhere in the code it can be removed without breaking the build.
Signed-off-by: Florian Grandel <fgrandel@gmail.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
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During service discovery, advertising will be disabled. This patch
ensures that it is correctly being re-enabled, both for configuration
made via set advertising and add advertising, once the scanning
times out.
Signed-off-by: Florian Grandel <fgrandel@gmail.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
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This patch ensures that instance advertising is correctly canceled
before starting a le scan.
Signed-off-by: Florian Grandel <fgrandel@gmail.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
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Advertising instances programmed while powered off should be advertised
once the device is powered. This patch ensures that all combinations
of setting and/or adding advertising configuration while powered off
will be correctly activated on power on.
Signed-off-by: Florian Grandel <fgrandel@gmail.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
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The remove_advertising() and remove_advertising_complete() functions
had instance identifiers hard coded. Notably, when passing in 0x00 as
an instance identifier to signal that all instances should be removed
then the mgmt API would return a hard coded 0x01 rather than returning
the expected value 0x00. This bug is being fixed by always referencing
the instance identifier from the management API call instead.
remove_advertising() is refactored to use the new dynamic advertising
instance list. The logic is being changed to make multi-instance
advertising actually work, notably the schedule_adv_instance() method is
being referenced to make sure that other instances will continue to
advertise even if one instance is being removed.
The code is made more readable by factoring advertising instance
management and initialization into the low-level
hci_remove_adv_instance() and hci_adv_instances_clear() functions.
The method now references the clear_adv_instance() helper method to
remove duplicate logic and code.
Signed-off-by: Florian Grandel <fgrandel@gmail.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
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The add_advertising() and add_advertising_complete() functions reference
the now obsolete hdev->adv_instance struct. Both methods are being
refactored to access the dynamic advertising instance list instead.
This patch also introduces all logic necessary to actually deal with
multiple instance advertising. Notably the mgmt_adv_inst_expired() and
schedule_adv_inst() method are being referenced to schedule instances in
a round robin fashion.
This patch also introduces a "pending" flag into the adv_info struct.
This is necessary to identify and remove recently added advertising
instances when the HCI commands return with an error status code.
Otherwise new advertising instances could be leaked without properly
informing userspace about their existence.
Signed-off-by: Florian Grandel <fgrandel@gmail.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
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The clear_adv_instance() function could not clean up multiple
advertising instances previously. It is being changed to provide both, a
means to clean up a single instance and cleaning up all instances at
once.
An additional instance parameter is being introduced to achieve this.
Passing in 0x00 to this parameter signifies that all instances should be
cleaned up. This semantics has been chosen similarly to the semantics of
the instance parameter in the remove_advertising() function.
When removing a single instance the method also ensures that another
instance will be scheduled if available. When the currently advertising
method is being removed, it will be canceled immediately.
Signed-off-by: Florian Grandel <fgrandel@gmail.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
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The set_advertising() and set_advertising_complete() methods rely on
the now obsolete hci_dev->adv_instance structure. We replace this
reference by an equivalent access to the newly introduced dynamic
advertising instance list.
This patch introduces a helper function that schedules an advertising
instance correctly calculating advertising timing based on the timeout
and duration settings of the instance. Scheduling is factored into
its own function for readability and code sharing.
Signed-off-by: Florian Grandel <fgrandel@gmail.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
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The create_instance_adv_data() function could not deal with
multiple advertising instances previously. This is being fixed by
retrieving advertising instances from the newly introduced dynamic
advertising instance list.
Signed-off-by: Florian Grandel <fgrandel@gmail.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
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The create_instance_scan_rsp_data() function could not deal with
multiple advertising instances previously. This is being fixed by adding
an additional instance parameter.
Signed-off-by: Florian Grandel <fgrandel@gmail.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
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Previously enable_advertising() would rely on
get_adv_instance_scan_rsp_len() which checked for a hard coded instance
identifier. This is being changed to check for the current advertising
instance's scan response length instead. The function is renamed
accordingly.
Signed-off-by: Florian Grandel <fgrandel@gmail.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
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Switch if and else conditions to replace a negative statement by a
positive one which makes the condition more readable.
Signed-off-by: Florian Grandel <fgrandel@gmail.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
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The get_adv_instance_flags() would not work with instance identifiers
other than 0x01. This is being fixed so that arbitrary instance
identifiers can be dealt with while still correctly dealing with the
special case of the 0x00 identifier.
Signed-off-by: Florian Grandel <fgrandel@gmail.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
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Replaces the hard coded instance identifier in
get_current_adv_instance() with the actual current instance identifier
so that this method is prepared to work with more than one advertising
instance.
Signed-off-by: Florian Grandel <fgrandel@gmail.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
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The read_adv_features() method had a single instance identifier hard
coded. Refer to the advertising instance list instead to return a
dynamically generated list of instance identifiers.
Signed-off-by: Florian Grandel <fgrandel@gmail.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
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The ...for_instance function name is quite long and does not follow the
..._inst_... convention followed elsewhere in the code. This patch
renames the ...for_instance functions to their shorter ..._inst_...
version.
Signed-off-by: Florian Grandel <fgrandel@gmail.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
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update_scan_rsp_data() duplicates code from get_current_adv_instance().
This is being fixed by letting the former make use of the latter.
Signed-off-by: Florian Grandel <fgrandel@gmail.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
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Currently the delayed work managing advertising duration and timeout is
part of the advertising instance structure. This is not correct as only
a single instance can be advertised at any given time. To implement
round robin advertising a single delayed work structure is needed.
To fix this the delayed work structure is being moved to the hci_dev
structure. The instance specific variable is renamed to "remaining_time"
to make it clear that this is the remaining lifetime of the instance and
not the current advertising timeout.
Signed-off-by: Florian Grandel <fgrandel@gmail.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
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The current hci dev structure only supports a single advertising
instance. To support multi-instance advertising it is necessary to
introduce a linked list of advertising instances so that multiple
advertising instances can be dynamically added and/or removed.
In a first step, the existing adv_instance member of the hci_dev
struct is supplemented by a linked list of advertising instances.
This patch introduces the list and supporting list management
infrastructure. The list is not being used yet.
Signed-off-by: Florian Grandel <fgrandel@gmail.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
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To prepare separation of the IPv6 code into different file.
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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xt_socket is useful for matching sockets with IP_TRANSPARENT and
taking some action on the matching packets. However, it lacks the
ability to match only a small subset of transparent sockets.
Suppose there are 2 applications, each with its own set of transparent
sockets. The first application wants all matching packets dropped,
while the second application wants them forwarded somewhere else.
Add the ability to retore the skb->mark from the sk_mark. The mark
is only restored if a matching socket is found and the transparent /
nowildcard conditions are satisfied.
Now the 2 hypothetical applications can differentiate their sockets
based on a mark value set with SO_MARK.
iptables -t mangle -I PREROUTING -m socket --transparent \
--restore-skmark -j action
iptables -t mangle -A action -m mark --mark 10 -j action2
iptables -t mangle -A action -m mark --mark 11 -j action3
Signed-off-by: Harout Hedeshian <harouth@codeaurora.org>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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This patch adds an additional attribute when sending
packet information via netlink in netfilter_queue module.
It will send additional security context data, so that
userspace applications can verify this context against
their own security databases.
Signed-off-by: Roman Kubiak <r.kubiak@samsung.com>
Acked-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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After the ->set() spinlocks were removed br_stp_set_bridge_priority
was left running without any protection when used via sysfs. It can
race with port add/del and could result in use-after-free cases and
corrupted lists. Tested by running port add/del in a loop with stp
enabled while setting priority in a loop, crashes are easily
reproducible.
The spinlocks around sysfs ->set() were removed in commit:
14f98f258f19 ("bridge: range check STP parameters")
There's also a race condition in the netlink priority support that is
fixed by this change, but it was introduced recently and the fixes tag
covers it, just in case it's needed the commit is:
af615762e972 ("bridge: add ageing_time, stp_state, priority over netlink")
Signed-off-by: Nikolay Aleksandrov <razor@blackwall.org>
Fixes: 14f98f258f19 ("bridge: range check STP parameters")
Signed-off-by: David S. Miller <davem@davemloft.net>
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This patch removes the additional module_put() in disconnect_all_peers()
making a correct module refcount so that the module can be removed after
disabling 6lowpan through debugfs.
Signed-off-by: Lukasz Duda <lukasz.duda@nordicsemi.no>
Signed-off-by: Glenn Ruben Bakke <glenn.ruben.bakke@nordicsemi.no>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
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This patch removes the kfree of the netdev priv in device_event() upon
NETDEV_UNREGISTER event. The freeing of memory is taken care of by the
netdev destructor.
Signed-off-by: Lukasz Duda <lukasz.duda@nordicsemi.no>
Signed-off-by: Glenn Ruben Bakke <glenn.ruben.bakke@nordicsemi.no>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
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This patch moves the sysfs device used by the netdev from the device of
the first connected peer to the hci sysfs device. Using the sysfs device
of hci instead of the first connected device fixes this issue such that
the sysfs group of tx-0 and bt0 kobject are still present after the last
peer has been deleted and all sysfs entries can be removed.
Signed-off-by: Lukasz Duda <lukasz.duda@nordicsemi.no>
Signed-off-by: Glenn Ruben Bakke <glenn.ruben.bakke@nordicsemi.no>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
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This patch renames the variable used to trigger scheduling of
delete_netdev. Changed to infinitiv in order to describe the action
to be done.
Signed-off-by: Lukasz Duda <lukasz.duda@nordicsemi.no>
Signed-off-by: Glenn Ruben Bakke <glenn.ruben.bakke@nordicsemi.no>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
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This patch fixes an issue with the netdev not being unregistered when
the last peer is deleted. Removing the logical negation operator on the
boolean solves this issue. If the last peer is removed the condition
will be true, and the delete_netdev() is scheduled.
Signed-off-by: Lukasz Duda <lukasz.duda@nordicsemi.no>
Signed-off-by: Glenn Ruben Bakke <glenn.ruben.bakke@nordicsemi.no>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
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There is no need to init res with zero, res can be unused but then we
returning zero and not res.
Signed-off-by: Alexander Aring <alex.aring@gmail.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
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This patch moves the hardware setting before calling the driver start
callback which activates the receive handling. The hardware setup
contains settings like address filtering which should be setup before
activate the receive handling on the transceiver. These setting are
protected by ieee802154_check_concurrent_iface check. This means we
need to set these registers once before calling drv_start and can't
be overwritten by other interfaces.
Signed-off-by: Alexander Aring <alex.aring@gmail.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
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Accessing current->pid/uid from cls_bpf may lead to misleading results and
should not be used when TC classifiers need accurate information about pid/uid.
Signed-off-by: Alexei Starovoitov <ast@plumgrid.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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This get_info handler will simply dispatch to the appropriate
existing inet protocol handler.
This patch also includes a new netlink attribute
(INET_DIAG_PROTOCOL). This attribute is currently only used
for multicast messages. Without this attribute, there is no
way of knowing the IP protocol used by the socket information
being broadcast. This attribute is not necessary in the 'dump'
variant of this protocol (though it could easily be added)
because dump requests are issued for specific family/protocol
pairs.
Tested: ss -E (note, the -E option has not yet been merged into
the upstream version of ss).
Signed-off-by: Craig Gallek <kraig@google.com>
Acked-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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Previously, there was no clear distinction between the inet protocols
that used struct tcp_info to report information and those that didn't.
This change adds a specific size attribute to the inet_diag_handler
struct which defines these interfaces. This will make dispatching
sock_diag get_info requests identical for all inet protocols in a
following patch.
Tested: ss -au
Tested: ss -at
Signed-off-by: Craig Gallek <kraig@google.com>
Acked-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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These groups will contain socket-destruction events for
AF_INET/AF_INET6, IPPROTO_TCP/IPPROTO_UDP.
Near the end of socket destruction, a check for listeners is
performed. In the presence of a listener, rather than completely
cleanup the socket, a unit of work will be added to a private
work queue which will first broadcast information about the socket
and then finish the cleanup operation.
Signed-off-by: Craig Gallek <kraig@google.com>
Acked-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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Add ndo_get_vf_stats where the PF retrieves and fills the VFs traffic
statistics. We encode the VF stats in a nested manner to allow for
future extensions.
Signed-off-by: Eran Ben Elisha <eranbe@mellanox.com>
Signed-off-by: Hadar Hen Zion <hadarh@mellanox.com>
Signed-off-by: Or Gerlitz <ogerlitz@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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We need to delete from offload the device externally learnded fdbs when any
one of these events happen:
1) Bridge ages out fdb. (When bridge is doing ageing vs. device doing
ageing. If device is doing ageing, it would send SWITCHDEV_FDB_DEL
directly).
2) STP state change flushes fdbs on port.
3) User uses sysfs interface to flush fdbs from bridge or bridge port:
echo 1 >/sys/class/net/BR_DEV/bridge/flush
echo 1 >/sys/class/net/BR_PORT/brport/flush
4) Offload driver send event SWITCHDEV_FDB_DEL to delete fdb entry.
For rocker, we can now get called to delete fdb entry in wait and nowait
contexts, so set NOWAIT flag when deleting fdb entry.
Signed-off-by: Scott Feldman <sfeldma@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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Samuel Ortiz says:
====================
NFC 4.2 pull request
This is the NFC pull request for 4.2.
- NCI drivers can now define their own handlers for processing
proprietary NCI responses and notifications.
- NFC vendors can use a dedicated netlink API to send their own
proprietary commands, like e.g. all commands needed to implement
vendor specific manufacturing tools.
- A new generic NCI over UART driver against which any NCI chipset
running on top of a serial interface can register.
- The st21nfcb driver is renamed to st-nci as it can and will support
most of ST Microelectronics NCI chipsets.
- The st21nfcb driver can put its CLF in hibernate mode and save
significant amount of power.
- A few st21nfcb minor fixes.
- The NXP NCI driver now supports ACPI enumeration.
- The Marvell NCI driver now supports both USB and serial
physical interfaces.
- The Marvell NCI drivers also supports NCI frames being muxed
over HCI. This is a setting that can be defined by a DT property.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>
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v2:
Move struct switchdev_obj automatics to inner scope where there used.
v1:
To maintain backward compatibility with the existing iproute2 "bridge vlan"
command, let bridge's setlink/dellink handler call into either the port
driver's 8021q ndo ops or the port driver's bridge_setlink/dellink ops.
This allows port driver to choose 8021q ops or the newer
bridge_setlink/dellink ops when implementing VLAN add/del filtering on the
device. The iproute "bridge vlan" command does not need to be modified.
To summarize using the "bridge vlan" command examples, we have:
1) bridge vlan add|del vid VID dev DEV
Here iproute2 sets MASTER flag. Bridge's bridge_setlink/dellink is called.
Vlan is set on bridge for port. If port driver implements ndo 8021q ops,
call those to port driver can install vlan filter on device. Otherwise, if
port driver implements bridge_setlink/dellink ops, call those to install
vlan filter to device. This option only works if port is bridged.
2) bridge vlan add|del vid VID dev DEV master
Same as 1)
3) bridge vlan add|del vid VID dev DEV self
Bridge's bridge_setlink/dellink isn't called. Port driver's
bridge_setlink/dellink is called, if implemented. This option works if
port is bridged or not. If port is not bridged, a VLAN can still be
added/deleted to device filter using this variant.
4) bridge vlan add|del vid VID dev DEV master self
This is a combination of 1) and 3), but will only work if port is bridged.
Signed-off-by: Scott Feldman <sfeldma@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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bpf_trace_printk() is a helper function used to debug eBPF programs.
Let socket and TC programs use it as well.
Note, it's DEBUG ONLY helper. If it's used in the program,
the kernel will print warning banner to make sure users don't use
it in production.
Signed-off-by: Alexei Starovoitov <ast@plumgrid.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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eBPF programs attached to kprobes need to filter based on
current->pid, uid and other fields, so introduce helper functions:
u64 bpf_get_current_pid_tgid(void)
Return: current->tgid << 32 | current->pid
u64 bpf_get_current_uid_gid(void)
Return: current_gid << 32 | current_uid
bpf_get_current_comm(char *buf, int size_of_buf)
stores current->comm into buf
They can be used from the programs attached to TC as well to classify packets
based on current task fields.
Update tracex2 example to print histogram of write syscalls for each process
instead of aggregated for all.
Signed-off-by: Alexei Starovoitov <ast@plumgrid.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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Pablo Neira Ayuso says:
====================
Netfilter updates for net-next
This a bit large (and late) patchset that contains Netfilter updates for
net-next. Most relevantly br_netfilter fixes, ipset RCU support, removal of
x_tables percpu ruleset copy and rework of the nf_tables netdev support. More
specifically, they are:
1) Warn the user when there is a better protocol conntracker available, from
Marcelo Ricardo Leitner.
2) Fix forwarding of IPv6 fragmented traffic in br_netfilter, from Bernhard
Thaler. This comes with several patches to prepare the change in first place.
3) Get rid of special mtu handling of PPPoE/VLAN frames for br_netfilter. This
is not needed anymore since now we use the largest fragment size to
refragment, from Florian Westphal.
4) Restore vlan tag when refragmenting in br_netfilter, also from Florian.
5) Get rid of the percpu ruleset copy in x_tables, from Florian. Plus another
follow up patch to refine it from Eric Dumazet.
6) Several ipset cleanups, fixes and finally RCU support, from Jozsef Kadlecsik.
7) Get rid of parens in Netfilter Kconfig files.
8) Attach the net_device to the basechain as opposed to the initial per table
approach in the nf_tables netdev family.
9) Subscribe to netdev events to detect the removal and registration of a
device that is referenced by a basechain.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>
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In case the net_device is gone, we have to unregister the hooks and put back
the reference on the net_device object. Once it comes back, register them
again. This also covers the device rename case.
This patch also adds a new flag to indicate that the basechain is disabled, so
their hooks are not registered. This flag is used by the netdev family to
handle the case where the net_device object is gone. Currently this flag is not
exposed to userspace.
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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This wrapper functions take care of hook registration for basechains.
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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The device is part of the hook configuration, so instead of a global
configuration per table, set it to each of the basechain that we create.
This patch reworks ebddf1a8d78a ("netfilter: nf_tables: allow to bind table to
net_device").
Note that this adds a dev_name field in the nft_base_chain structure which is
required the netdev notification subscription that follows up in a patch to
handle gone net_devices.
Suggested-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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After Florian patches, there is no need for XT_TABLE_INFO_SZ anymore :
Only one copy of table is kept, instead of one copy per cpu.
We also can avoid a dereference if we put table data right after
xt_table_info. It reduces register pressure and helps compiler.
Then, we attempt a kmalloc() if total size is under order-3 allocation,
to reduce TLB pressure, as in many cases, rules fit in 32 KB.
Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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Jozsef Kadlecsik says:
====================
ipset patches for nf-next
Please consider to apply the next bunch of patches for ipset. First
comes the small changes, then the bugfixes and at the end the RCU
related patches.
* Use MSEC_PER_SEC consistently instead of the number.
* Use SET_WITH_*() helpers to test set extensions from Sergey Popovich.
* Check extensions attributes before getting extensions from Sergey Popovich.
* Permit CIDR equal to the host address CIDR in IPv6 from Sergey Popovich.
* Make sure we always return line number on batch in the case of error
from Sergey Popovich.
* Check CIDR value only when attribute is given from Sergey Popovich.
* Fix cidr handling for hash:*net* types, reported by Jonathan Johnson.
* Fix parallel resizing and listing of the same set so that the original
set is kept for the whole dumping.
* Make sure listing doesn't grab a set which is just being destroyed.
* Remove rbtree from ip_set_hash_netiface.c in order to introduce RCU.
* Replace rwlock_t with spinlock_t in "struct ip_set", change the locking
in the core and simplifications in the timeout routines.
* Introduce RCU locking in bitmap:* types with a slight modification in the
logic on how an element is added.
* Introduce RCU locking in hash:* types. This is the most complex part of
the changes.
* Introduce RCU locking in list type where standard rculist is used.
* Fix coding styles reported by checkpatch.pl.
====================
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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It was not possible to register a UART driver due
to a bad condition.
Signed-off-by: Vincent Cuissard <cuissard@marvell.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
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According to the reporter, they are not needed.
Reported-by: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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This patch flushs the workqueue which is currently used for xmit_sync
callback before calling stop driver-ops. Flush the queue will ensure all
pending tx frames are transmitted.
Signed-off-by: Alexander Aring <alex.aring@gmail.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
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Marcel Holtmann
Florian Grandel
Pablo Neira Ayuso
Harout Hedeshian
Roman Kubiak
Nikolay Aleksandrov
Glenn Ruben Bakke
Alexander Aring
Alexei Starovoitov
Craig Gallek
Eran Ben Elisha
Scott Feldman
David S. Miller
Eric Dumazet
Vincent Cuissard