Antonio Quartulli says:

====================
Included changes:
- avoid integer overflow in GW selection routine
- prevent race condition by making capability bit changes atomic (use
  clear/set/test_bit)
- fix synchronization issue in mcast tvlv handler
- fix crash on double list removal of TT Request objects
- fix leak by puring packets enqueued for sending upon iface removal
- ensure network header pointer is set in skb
====================
Signed-off-by: David S. Miller <davem@davemloft.net>

Merge tag 'mac80211-next-for-davem-2015-08-14' of git://git.kernel.org/pub/scm/linux/kernel/git/jberg/mac80211-next

Johannes Berg says:

====================
Another pull request for the next cycle, this time with quite
a bit of content:
 * mesh fixes/improvements from Alexis, Bob, Chun-Yeow and Jesse
 * TDLS higher bandwidth support (Arik)
 * OCB fixes from Bertold Van den Bergh
 * suspend/resume fixes from Eliad
 * dynamic SMPS support for minstrel-HT (Krishna Chaitanya)
 * VHT bitrate mask support (Lorenzo Bianconi)
 * better regulatory support for 5/10 MHz channels (Matthias May)
 * basic support for MU-MIMO to avoid the multi-vif issue (Sara Sharon)
along with a number of other cleanups.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>

Willem de Bruijn says:

====================
packet: add cBPF and eBPF fanout modes

Allow programmable fanout modes. Support both classical BPF programs
passed directly and extended BPF programs passed by file descriptor.

One use case is packet steering by deep packet inspection, for
instance for packet steering by application layer header fields.

Separate the configuration of the fanout mode and the configuration
of the program, to allow dynamic updates to the latter at runtime.

Changes
  v1 -> v2:
    - follow SO_LOCK_FILTER semantics on filter updates
    - only accept eBPF programs of type BPF_PROG_TYPE_SOCKET_FILTER
    - rename PACKET_FANOUT_BPF to PACKET_FANOUT_CBPF to match
      man 2 bpf usage: "classic" vs. "extended" BPF.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>

Test PACKET_FANOUT_EBPF by inserting a program into the the kernel
with bpf(), then attaching it to the fanout group. Observe the same
payload-based distribution as in the PACKET_FANOUT_CBPF test.
Signed-off-by: Willem de Bruijn <willemb@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Test PACKET_FANOUT_CBPF by inserting a cBPF program that selects a
socket by payload. Requires modifying the test program to send
packets with multiple payloads.

Also fix a bug in testing the return value of mmap()
Signed-off-by: Willem de Bruijn <willemb@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Add fanout mode PACKET_FANOUT_EBPF that accepts an en extended BPF
program to select a socket.

Update the internal eBPF program by passing to socket option
SOL_PACKET/PACKET_FANOUT_DATA a file descriptor returned by bpf().
Signed-off-by: Willem de Bruijn <willemb@google.com>
Acked-by: Alexei Starovoitov <ast@plumgrid.com>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

Add fanout mode PACKET_FANOUT_CBPF that accepts a classic BPF program
to select a socket.

This avoids having to keep adding special case fanout modes. One
example use case is application layer load balancing. The QUIC
protocol, for instance, encodes a connection ID in UDP payload.

Also add socket option SOL_PACKET/PACKET_FANOUT_DATA that updates data
associated with the socket group. Fanout mode PACKET_FANOUT_CBPF is the
only user so far.
Signed-off-by: Willem de Bruijn <willemb@google.com>
Acked-by: Alexei Starovoitov <ast@plumgrid.com>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

We already have IFLA_IPTUN_ netlink attributes. The IP_TUN_ attributes look
very similar, yet they serve very different purpose. This is confusing for
anyone trying to implement a user space tool supporting lwt.

As the IP_TUN_ attributes are used only for the lightweight tunnels, prefix
them with LWTUNNEL_IP_ instead to make their purpose clear. Also, it's more
logical to have them in lwtunnel.h together with the encap enum.

Fixes: 3093fbe7 ("route: Per route IP tunnel metadata via lightweight tunnel")
Signed-off-by: Jiri Benc <jbenc@redhat.com>
Acked-by: Thomas Graf <tgraf@suug.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>

Commit 0b50dc4f ("Convert smsc911x to use ACPI as well as DT") makes
the call to smsc911x_probe_config() unconditional, and no longer fails if
there is no device node. device_get_phy_mode() is called unconditionally,
and if there is no phy node configured returns an error code. This error
code is assigned to phy_interface, and interpreted elsewhere in the code
as valid phy mode. This in turn causes qemu to crash when running a
variant of realview_pb_defconfig.

	qemu: hardware error: lan9118_read: Bad reg 0x86

Fixes: 0b50dc4f ("Convert smsc911x to use ACPI as well as DT")
Cc: Jeremy Linton <jeremy.linton@arm.com>
Cc Graeme Gregory <graeme.gregory@linaro.org>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

Steffen Klassert says:

====================
pull request (net-next): ipsec-next 2015-08-17

1) Fix IPv6 ECN decapsulation for IPsec interfamily tunnels.
   From Thomas Egerer.

2) Use kmemdup instead of duplicating it in xfrm_dump_sa().
   From Andrzej Hajda.

3) Pass oif to the xfrm lookups so that it gets set on the flow
   and the resolver routines can match based on oif.
   From David Ahern.

4) Add documentation for the new xfrm garbage collector threshold.
   From Alexander Duyck.

Please pull or let me know if there are problems.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>

Sparse builds have been warning for a really long time now
that etherdevice.h has a conversion that is unsafe.

  include/linux/etherdevice.h:79:32: warning: restricted __be16 degrades to integer

This code change fixes the issue and generates the exact
same assembly before/after (checked on x86_64)

Fixes: 2c722fe1 (etherdevice: Optimize a few is_<foo>_ether_addr functions)
Signed-off-by: Jesse Brandeburg <jesse.brandeburg@intel.com>
CC: Joe Perches <joe@perches.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Phil Sutter says:

====================
net: introduce IFF_NO_QUEUE as successor of zero tx_queue_len

This series adds a new private net_device flag indicating that a device may
(and probably should) be used without a queueing discipline attached to it.
This is already common practice for many virtual device types like e.g.
loopback, VLAN (802.1Q) or bridges (802.1D). The reason for this is that these
devices lack an underlying layer which could impose back pressure and therefore
making a TX queue necessary to not slow down senders.

Up to now, drivers being aware of the above applying to them set
dev->tx_queue_len to zero to indicate no qdisc should be attached to the
interface they drive and the kernel reacts upon this by assigning the noop
qdisc instead of the default pfifo_fast. This implicit agreement though leads
to an inconvenient situation once a user tries to attach a real qdisc to these
devices, as the formerly special tx_queue_len value becomes a regular one,
limiting the queue to zero packets and thus prevents any TX from happening. To
overcome this, practically all qdisc implementations intercept and sanitize the
malicious value.

With this series applied, drivers may signal the lack of need for a qdisc
without having to tamper with tx_queue_len, making fallbacks in qdiscs and
caveats in userspace unnecessary.

Upon upstream acceptance, this series will be followed up by a set of patches
converting device drivers, adding a warning so out-of-tree driver authors get
aware of this change and dropping all special handling of tx_queue_len in
net/sched/.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>

Handle IFF_NO_QUEUE as alternative to tx_queue_len being zero.
Signed-off-by: Phil Sutter <phil@nwl.cc>
Acked-by: Jesper Dangaard Brouer <brouer@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

This private net_device flag can be set by drivers to inform that a
device runs fine without a qdisc attached. This was formerly done by
setting tx_queue_len to zero.
Signed-off-by: Phil Sutter <phil@nwl.cc>
Acked-by: Jesper Dangaard Brouer <brouer@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

A zero length payload means that no TLV (Type Length Value) data has
been passed. Prior to this patch a non-existing TLV could be sanity
checked with TLV_OK() resulting in random behavior where a user
sending an empty message occasionally got a incorrect "operation not
supported" message back.
Signed-off-by: Richard Alpe <richard.alpe@ericsson.com>
Reviewed-by: Erik Hugne <erik.hugne@ericsson.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Management firmware tells driver in case bandwidth configuration for
a specific function exists, but [regretably] the same field has different
meanings depending on the multi-function mode - it can either be
a percentile value or an actual speed.

For newer multi-function modes current logic is incorrect -
driver understands values as actual speeds instead of percentages,
causing the resulting chip configuration to be incorrect.
Signed-off-by: Yuval Mintz <Yuval.Mintz@qlogic.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

fib_lookup() forces FIB_LOOKUP_NOREF flag, while fib_table_lookup()
does not.

This patch solves the typical message at reboot time or device
dismantle :

unregister_netdevice: waiting for eth0 to become free. Usage count = 4

Fixes: 3bfd8472 ("net: Use passed in table for nexthop lookups")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: David Ahern <dsa@cumulusnetworks.com>
Acked-by: David Ahern <dsa@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

The two commits noted below added calls to ip_hdr() and ipv6_hdr(). They
need a correctly set skb network header.

Unfortunately we cannot rely on the device drivers to set it for us.
Therefore setting it in the beginning of the according ndo_start_xmit
handler.

Fixes: 1d8ab8d3 ("batman-adv: Modified forwarding behaviour for multicast packets")
Fixes: ab49886e ("batman-adv: Add IPv4 link-local/IPv6-ll-all-nodes multicast support")
Signed-off-by: Linus Lüssing <linus.luessing@c0d3.blue>
Signed-off-by: Marek Lindner <mareklindner@neomailbox.ch>
Signed-off-by: Antonio Quartulli <antonio@meshcoding.com>

When an interface is purged, the broadcast packets scheduled for this
interface should get purged as well.
Signed-off-by: Simon Wunderlich <simon@open-mesh.com>
Signed-off-by: Marek Lindner <mareklindner@neomailbox.ch>
Signed-off-by: Antonio Quartulli <antonio@meshcoding.com>

The list_del() calls were changed to list_del_init() to prevent
an accidental double deletion in batadv_tt_req_node_new().
Signed-off-by: Marek Lindner <mareklindner@neomailbox.ch>
Signed-off-by: Antonio Quartulli <antonio@meshcoding.com>

So far the mcast tvlv handler did not anticipate the processing of
multiple incoming OGMs from the same originator at the same time. This
can lead to various issues:

* Broken refcounting: For instance two mcast handlers might both assume
  that an originator just got multicast capabilities and will together
  wrongly decrease mcast.num_disabled by two, potentially leading to
  an integer underflow.

* Potential kernel panic on hlist_del_rcu(): Two mcast handlers might
  one after another try to do an
  hlist_del_rcu(&orig->mcast_want_all_*_node). The second one will
  cause memory corruption / crashes.
  (Reported by: Sven Eckelmann <sven@narfation.org>)

Right in the beginning the code path makes assumptions about the current
multicast related state of an originator and bases all updates on that. The
easiest and least error prune way to fix the issues in this case is to
serialize multiple mcast handler invocations with a spinlock.

Fixes: 60432d75 ("batman-adv: Announce new capability via multicast TVLV")
Signed-off-by: Linus Lüssing <linus.luessing@c0d3.blue>
Signed-off-by: Marek Lindner <mareklindner@neomailbox.ch>
Signed-off-by: Antonio Quartulli <antonio@meshcoding.com>

Bitwise OR/AND assignments in C aren't guaranteed to be atomic. One
OGM handler might undo the set/clear of a specific bit from another
handler run in between.

Fix this by using the atomic set_bit()/clear_bit()/test_bit() functions.

Fixes: 60432d75 ("batman-adv: Announce new capability via multicast TVLV")
Signed-off-by: Linus Lüssing <linus.luessing@c0d3.blue>
Signed-off-by: Marek Lindner <mareklindner@neomailbox.ch>
Signed-off-by: Antonio Quartulli <antonio@meshcoding.com>

Bitwise OR/AND assignments in C aren't guaranteed to be atomic. One
OGM handler might undo the set/clear of a specific bit from another
handler run in between.

Fix this by using the atomic set_bit()/clear_bit()/test_bit() functions.

Fixes: e17931d1 ("batman-adv: introduce capability initialization bitfield")
Signed-off-by: Linus Lüssing <linus.luessing@c0d3.blue>
Signed-off-by: Marek Lindner <mareklindner@neomailbox.ch>
Signed-off-by: Antonio Quartulli <antonio@meshcoding.com>

Bitwise OR/AND assignments in C aren't guaranteed to be atomic. One
OGM handler might undo the set/clear of a specific bit from another
handler run in between.

Fix this by using the atomic set_bit()/clear_bit()/test_bit() functions.

Fixes: 3f4841ff ("batman-adv: tvlv - add network coding container")
Signed-off-by: Linus Lüssing <linus.luessing@c0d3.blue>
Signed-off-by: Marek Lindner <mareklindner@neomailbox.ch>
Signed-off-by: Antonio Quartulli <antonio@meshcoding.com>

Bitwise OR/AND assignments in C aren't guaranteed to be atomic. One
OGM handler might undo the set/clear of a specific bit from another
handler run in between.

Fix this by using the atomic set_bit()/clear_bit()/test_bit() functions.

Fixes: 17cf0ea4 ("batman-adv: tvlv - add distributed arp table container")
Signed-off-by: Linus Lüssing <linus.luessing@c0d3.blue>
Signed-off-by: Marek Lindner <mareklindner@neomailbox.ch>
Signed-off-by: Antonio Quartulli <antonio@meshcoding.com>

The bit was not according to ieee80211 specification.
Fix that.
Reviewed-by: Arik Nemtsov <arik@wizery.com>
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

Instead of using the out-of-line average calculation, use the new
DECLARE_EWMA() macro to declare a signal EWMA, and use that.

This actually *reduces* the code size slightly (on x86-64) while
also reducing the station info size by 80 bytes.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

Having the EWMA parameters stored in the runtime struct imposes
memory requirements for the constant values that could just be
inlined in the code. This particularly makes sense if there are
a lot of such structs, for example in mac80211 in the station
table where each station has a number of these in an array, and
there can be many stations.

Provide a macro DECLARE_EWMA() that declares the necessary struct
and inline functions to access it with the parameters hard-coded;
using this also means the user no longer needs to 'select AVERAGE'
as it's entirely self-contained.

In the mac80211 case, on x86-64, this actually slightly *reduces*
code size, while also saving 80 bytes of runtime memory per sta.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

During hwsim_init_netlink(), we should call genl_unregister_family()
if failed on netlink_register_notifier() since the genetlink is
already registered.
Signed-off-by: Su Kang Yin <cantona@cantona.net>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

Define rc_rateidx_vht_mcs_mask array and rate_idx_match_vht_mcs_mask()
method in order to apply mcs mask for vht rates
Signed-off-by: Lorenzo Bianconi <lorenzo.bianconi83@gmail.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

Define rate_control_apply_mask_ratetbl() in order to apply ratemask in
rate_control_set_rates() for station rate table
Signed-off-by: Lorenzo Bianconi <lorenzo.bianconi83@gmail.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

Remove ieee80211_tx_rate dependency in rate_idx_match_legacy_mask(),
rate_idx_match_mcs_mask() and rate_idx_match_mask() in order to use the
previous logic to define a ratemask in rate_control_set_rates() for
station rate table. Moreover move rate mask definition logic in
rate_control_cap_mask()
Signed-off-by: Lorenzo Bianconi <lorenzo.bianconi83@gmail.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

Remove unnecessary ieee80211_tx_info pointer from rate_control_apply_mask
signature. rate_control_apply_mask() will be used to define a ratemask in
rate_control_set_rates() for station rate table
Signed-off-by: Lorenzo Bianconi <lorenzo.bianconi83@gmail.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

Perform the BSS_CHANGED_BSSID action when joining an OCB network.
This is required to set the broadcast BSSID in some network drivers.
Signed-off-by: Bertold Van den Bergh <bertold.vandenbergh@esat.kuleuven.be>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

Currently OCB mode accepts frames with bssid==broadcast and type!=beacon.
Some non-data frames are sent matching this, for example probe responses.
This results in unnecessary creation of STA entries.
Signed-off-by: Bertold Van den Bergh <bertold.vandenbergh@esat.kuleuven.be>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

To make mac80211 accept the multicast rate requested by the user the
rate control should be told that it is operating in BSS mode.
Without this, the default rate is selected in rate_control_send_low
(!pubsta and !txrc->bss)
Signed-off-by: Bertold Van den Bergh <bertold.vandenbergh@esat.kuleuven.be>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

Allow setting multicast rate on OCB interfaces.
Current behaviour results in EOPNOTSUPP when attempting this.
Signed-off-by: Bertold Van den Bergh <bertold.vandenbergh@esat.kuleuven.be>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

If driver failed to setup wiphy params (e.g. rts
threshold, fragmentation treshold) userspace
wasn't properly notified about this. This could
lead to user confusion who would think the command
succeeded even if that wasn't the case.
Signed-off-by: Michal Kazior <michal.kazior@tieto.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

The original assumption of 20MHz wide channels hasn't been true since
the addition of support for 5 and 10 MHz channels.
Change the code to no longer disable all channels that don't fit into
the 20MHz grid, but instead set the appropriate flags to disable
operation on specific bandwidths.
Signed-off-by: Matthias May <matthias.may@neratec.com>
[reword commit message]
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

David Ahern says:

====================
VRF-lite - v6

In the context of internet scale routing a requirement that always comes
up is the need to partition the available routing tables into disjoint
routing planes. A specific use case is the multi-tenancy problem where
each tenant has their own unique routing tables and in the very least
need different default gateways.

This patch allows the ability to create virtual router domains (aka VRFs
(VRF-lite to be specific) in the linux packet forwarding stack. The main
observation is that through the use of rules and socket binding to interfaces,
all the facilities that we need are already present in the infrastructure. What
is missing is a handle that identifies a routing domain and can be used to
gather applicable rules/tables and uniqify neighbor selection. The scheme used
needs to preserves the notions of ECMP, and general routing principles.

This driver is a cross between functionality that the IPVLAN driver
and the Team drivers provide where a device is created and packets
into/out of the routing domain are shuttled through this device. The
device is then used as a handle to identify the applicable rules. The
VRF device is thus the layer3 equivalent of a vlan device.

The very important point to note is that this is only a Layer3 concept
so L2 tools (e.g., LLDP) do not need to be run in each VRF, processes can
run in unaware mode or select a VRF to be talking through. Also the
behavioral model is a generalized application of the familiar VRF-Lite
model with some performance paths that need optimization. (Specifically
the output route selector that Roopa, Robert, Thomas and EricB are
currently discussing on the MPLS thread)

High Level points
=================
1. Simple overlay driver (minimal changes to current stack)
   * uses the existing fib tables and fib rules infrastructure
2. Modelled closely after the ipvlan driver
3. Uses current API and infrastructure.
   * Applications can use SO_BINDTODEVICE or cmsg device indentifiers
     to pick VRF (ping, traceroute just work)
   * Standard IP Rules work, and since they are aggregated against the
     device, scale is manageable
4. Completely orthogonal to Namespaces and only provides separation in
   the routing plane (and ARP)

                                                 N2
           N1 (all configs here)          +---------------+
    +--------------+                      |               |
    |swp1 :10.0.1.1+----------------------+swp1 :10.0.1.2 |
    |              |                      |               |
    |swp2 :10.0.2.1+----------------------+swp2 :10.0.2.2 |
    |              |                      +---------------+
    | VRF 1        |
    | table 5      |
    |              |
    +---------------+
    |              |
    | VRF 2        |                             N3
    | table 6      |                      +---------------+
    |              |                      |               |
    |swp3 :10.0.2.1+----------------------+swp1 :10.0.2.2 |
    |              |                      |               |
    |swp4 :10.0.3.1+----------------------+swp2 :10.0.3.2 |
    +--------------+                      +---------------+

Given the topology above, the setup needed to get the basic VRF
functions working would be

Create the VRF devices and associate with a table
    ip link add vrf1 type vrf table 5
    ip link add vrf2 type vrf table 6

Install the lookup rules that map table to VRF domain
    ip rule add pref 200 oif vrf1 lookup 5
    ip rule add pref 200 iif vrf1 lookup 5
    ip rule add pref 200 oif vrf2 lookup 6
    ip rule add pref 200 iif vrf2 lookup 6

    ip link set vrf1 up
    ip link set vrf2 up

Enslave the routing member interfaces
    ip link set swp1 master vrf1
    ip link set swp2 master vrf1
    ip link set swp3 master vrf2
    ip link set swp4 master vrf2

Connected and local routes are automatically moved from main and local
tables to the VRF table.

ping using VRF0 is simply
    ping -I vrf0 10.0.1.2

Design Highlights
=================
If a device is enslaved to a VRF device (ie., associated with a VRF)
then:
1. Rx path
   The master device index is used as the iif for all lookups.

2. Tx path
   Similarly, for Tx the VRF device oif is used in the flow to direct
   lookups to the table associated with the VRF via its rule. From there
   the FLOWI_FLAG_VRFSRC flag is used to indicate that the oif should
   not be used for FIB table lookups.

3. Connected and local routes
   On link up for a device, connected and local routes are added to the
   table associated with the VRF device, rather than the local and main
   tables.

4. Socket lookups
   Sockets operating in the VRF must be bound to the VRF device. As such
   socket lookups compare the VRF device index to sk_bound_dev_if.

5. Neighbor entries
   Neighbor entries are not impacted by the VRF device. Entries are
   associated with a particular interface; the VRF association is indirect
   via the interface-to-VRF device enslavement.

Version 6
- addressed comments from DaveM

- added patch to properly set oif in ip_send_unicast_reply. Needs to be
  set to VRF device for proper FIB lookup

- added patch to handle IP fragments

Version 5
- dropped patch regarding socket lookups; no longer needed
  + removed vrf helpers no longer needed after this patch is dropped
- removed dev_open and close operations
  + no need to reset vrf data on an ifdown and creates problems if a
    slave is deleted while the vrf interface is down (Thanks, Nikolay)
- cleanups for sparse warnings
  + make C=2 is now clean for vrf driver

Version 4
- builds are clean with and without VRF device enabled (no, yes and module)
- tightened the driver implementation
  + device add/delete, slave add/remove, and module unload are all clean
- fixed RCU references
  + with RCU and lock debugging enabled changes are clean through the
    suite of tests
- TX path uses custom dst, so patch refactoring rtable allocation is
  dropped along with the patch adding rt_nexthop helper
- dropped the task patch that adds default bind to interface for sockets
  and the associated chvrf example command
  + the patches are a convenience for running unmodified code. They
    are not needed for the core functionality. Any application with
    support for SO_BINDTODEVICE works properly with this patch set.

Version 3
- addressed comments from first 2 RFCs with the exception of the name
  Nicolas: We will do the name conversion once we agree on what the
           correct name should be (vrf, mrf or something else)

-  packets flow through the VRF device in both directions allowing the
   following:
   - tcpdump -i vrf<n>
   - tc rules on vrf device
   - netfilter rules on vrf device

TO-DO
=====
1. IPv6

2. ipsec, xfrms
   - dst patch accepted into ipsec-next; will post VRF patch once merge happens

3. listen filter to allow 1 socket to work with multiple VRF devices
   - i.e., bind to VRF's a, b, c only or NOT VRFs e, f, g

Eric B:
  I have ipsec working with VRFs implemented using the VRF driver,
  including the worst case scenario of complete duplication in the
  networking config.

Thanks to Nikolay for his many, many code reviews whipping the device
driver into shape, and bug-Fixes and ideas from Hannes, Roopa Prabhu,
Jon Toppins, Jamal.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>