A proprietary vendor command may send back useful data to the user
application.

For example, the field level applied on the NFC router antenna.

Still based on net/wireless/nl80211.c implementation,
add nfc_vendor_cmd_alloc_reply_skb and nfc_vendor_cmd_reply in
order to send back over netlink data generated by a proprietary
command.
Signed-off-by: Christophe Ricard <christophe-h.ricard@st.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

skb can be NULL and may lead to a NULL pointer error.

Add a check condition before setting HCI rx buffer.

Cc: stable@vger.kernel.org
Signed-off-by: Christophe Ricard <christophe-h.ricard@st.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

Add driver for Samsung S3FWRN5 NFC controller.
S3FWRN5 is using NCI protocol and I2C communication interface.
Signed-off-by: Robert Baldyga <r.baldyga@samsung.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

Some drivers needs to have ability to reinit NCI core, for example
after updating firmware in setup() of post_setup() callback. This
patch makes nci_core_reset() and nci_core_init() functions public,
to make it possible.
Signed-off-by: Robert Baldyga <r.baldyga@samsung.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

Some drivers require non-standard configuration after NCI_CORE_INIT
request, because they need to know ndev->manufact_specific_info or
ndev->manufact_id. This patch adds post_setup handler allowing to do
such custom configuration.
Signed-off-by: Robert Baldyga <r.baldyga@samsung.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

Although it should be unnecessary, add a NULL pointer check
to trf7970a_send_upstream() to eliminate a smatch warning.
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Mark Greer <mgreer@animalcreek.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

The SDD_EN bit in the NFC Target Detection Level Register
is bit 5 not bit 3 so change the TRF7970A_NFC_TARGET_LEVEL_SDD_EN
macro accordingly.
Reported-by: Raymond Lei <Raymond.Lei@ecolab.com>
Signed-off-by: Mark Greer <mgreer@animalcreek.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

When NFC_ATTR_VENDOR_DATA is not set, data_len is 0 and data is NULL.

Fixes the following warning:

net/nfc/netlink.c:1536:3: warning: 'data' may be used uninitialized
+in this function [-Wmaybe-uninitialized]
      return cmd->doit(dev, data, data_len);

Cc: stable@vger.kernel.org
Signed-off-by: Christophe Ricard <christophe-h.ricard@st.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

NFC_ATTR_VENDOR_DATA is an optional vendor_cmd argument.
The current code was potentially using a non existing argument
leading to potential catastrophic results.

Cc: stable@vger.kernel.org
Signed-off-by: Christophe Ricard <christophe-h.ricard@st.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

spi phy needs to use ndlc_recv at every spi transaction causing
"unknown packet control byte" error message each time the header
is 00. Make this silent.
Signed-off-by: Christophe Ricard <christophe-h.ricard@st.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

Add st-nci-spi phy devicetree documentation
Signed-off-by: Christophe Ricard <christophe-h.ricard@st.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

st21nfcb does support another phy than i2c: spi.
st21nfcc does not support spi as the spi ios are used
by the AMS RF booster.

st21nfcb is not following NCI NFC Forum recommendations for spi
but rely on ST prioritary protocol ndlc as for i2c.
Signed-off-by: Christophe Ricard <christophe-h.ricard@st.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

PCB_SYNC different than PCB_TYPE_SUPERVISOR or PCB_TYPE_DATAFRAME
should be discarded.

Irrelevant data may be forwarded up to the ndlc state machine by
phys like spi to prevent missing potential data during "write"
transactions.

Cc: stable@vger.kernel.org
Signed-off-by: Christophe Ricard <christophe-h.ricard@st.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

When receiving a NDLC PCB_SYNC_ACK the pending data was never
removed from ack_pending_q and cleared.

Cc: stable@vger.kernel.org
Signed-off-by: Christophe Ricard <christophe-h.ricard@st.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

st_nci_hci_load_session() calls kfree_skb() on unitialized
variables skb_pipe_info and skb_pipe_list if the call to
nci_hci_connect_gate() failed. Reword the error path to not use
these variables when they are not initialized. While at it, there
seemed to be a memory leak because skb_pipe_info was only freed
once, after the for-loop, even though several ones were created
by nci_hci_send_cmd.

Cc: stable@vger.kernel.org
Acked-by: Christophe Ricard <christophe-h.ricard@st.com>
Signed-off-by: Nicolas Iooss <nicolas.iooss_linux@m4x.org>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

st21nfca_hci_load_session() calls kfree_skb() on unitialized
variables skb_pipe_info and skb_pipe_list if the call to
nfc_hci_connect_gate() failed. Reword the error path to not use
these variables when they are not initialized. While at it, there
seemed to be a memory leak because skb_pipe_info was only freed
once, after the for-loop, even though several ones were created
by nfc_hci_send_cmd.

Fixes: ec03ff1a
("NFC: st21nfca: Remove skb_pipe_list and skb_pipe_info
useless allocation")

Cc: stable@vger.kernel.org
Acked-by: Christophe Ricard <christophe-h.ricard@st.com>
Signed-off-by: Nicolas Iooss <nicolas.iooss_linux@m4x.org>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

Due to a copy and paste error st_nci_i2c_read still contains
st21nfca header comment.

Cc: stable@vger.kernel.org
Signed-off-by: Christophe Ricard <christophe-h.ricard@st.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

Replace ST21NFCB with ST_NCI or st21nfcb with st_nci as it
was forgotten in commit "nfc: st-nci: Rename st21nfcb to st-nci"
ed06aeef

Cc: stable@vger.kernel.org
Signed-off-by: Christophe Ricard <christophe-h.ricard@st.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

commit "nfc: st-nci: Rename st21nfcb to st-nci" adds
include/linux/platform_data/st_nci.h duplicated with
include/linux/platform_data/st-nci.h.

Only drivers/nfc/st-nci/i2c.c uses platform_data/st_nci.h.

Cc: stable@vger.kernel.org
Reported-by: Hauke Mehrtens <hauke@hauke-m.de>
Signed-off-by: Christophe Ricard <christophe-h.ricard@st.com>
Signed-off-by: Samuel Ortiz <sameo@linux.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>

This driver borrows heavily from IPvlan and teaming drivers.

Routing domains (VRF-lite) are created by instantiating a VRF master
device with an associated table and enslaving all routed interfaces that
participate in the domain. As part of the enslavement, all connected
routes for the enslaved devices are moved to the table associated with
the VRF device. Outgoing sockets must bind to the VRF device to function.

Standard FIB rules bind the VRF device to tables and regular fib rule
processing is followed. Routed traffic through the box, is forwarded by
using the VRF device as the IIF and following the IIF rule to a table
that is mated with the VRF.

Example:

   Create vrf 1:
     ip link add vrf1 type vrf table 5
     ip rule add iif vrf1 table 5
     ip rule add oif vrf1 table 5
     ip route add table 5 prohibit default
     ip link set vrf1 up

   Add interface to vrf 1:
     ip link set eth1 master vrf1
Signed-off-by: Shrijeet Mukherjee <shm@cumulusnetworks.com>
Signed-off-by: David Ahern <dsa@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Fragmentation cache uses information from the IP header to reassemble
packets. That information can be duplicated across VRFs -- same source
and destination addresses, protocol and id. Handle fragmentation with
VRFs by adding the VRF device index to entries in the cache and the
lookup arg.
Signed-off-by: David Ahern <dsa@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

If output device is not specified use VRF device if input device is
enslaved. This is needed to ensure tcp acks and resets go out VRF device.
Signed-off-by: David Ahern <dsa@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

If a user passes in a table for new routes use that table for nexthop
lookups. Specifically, this solves the case where a connected route does
not exist in the main table, but only another table and then a subsequent
route is added with a next hop using the connected route. ie.,

$ ip route ls
default via 10.0.2.2 dev eth0
10.0.2.0/24 dev eth0  proto kernel  scope link  src 10.0.2.15
169.254.0.0/16 dev eth0  scope link  metric 1003
192.168.56.0/24 dev eth1  proto kernel  scope link  src 192.168.56.51

$ ip route ls table 10
1.1.1.0/24 dev eth2  scope link

Without this patch adding a nexthop route fails:

$ ip route add table 10 2.2.2.0/24 via 1.1.1.10
RTNETLINK answers: Network is unreachable

With this patch the route is added successfully.
Signed-off-by: David Ahern <dsa@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

When a device associated with a VRF is brought up or down routes
should be added to/removed from the table associated with the VRF.
fib_magic defaults to using the main or local tables. Have it use
the table with the device if there is one.

A part of this is directing prefsrc validations to the correct
table as well.
Signed-off-by: David Ahern <dsa@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Currently inet_addr_type and inet_dev_addr_type expect local addresses
to be in the local table. With the VRF device local routes for devices
associated with a VRF will be in the table associated with the VRF.
Provide an alternate inet_addr lookup to use a specific table rather
than defaulting to the local table.

inet_addr_type_dev_table keeps the same semantics as inet_addr_type but
if the passed in device is enslaved to a VRF then the table for that VRF
is used for the lookup.
Signed-off-by: David Ahern <dsa@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Currently inet_addr_type and inet_dev_addr_type expect local addresses
to be in the local table. With the VRF device local routes for devices
associated with a VRF will be in the table associated with the VRF.
Provide an alternate inet_addr lookup to use a specific table rather
than defaulting to the local table.
Signed-off-by: Shrijeet Mukherjee <shm@cumulusnetworks.com>
Signed-off-by: David Ahern <dsa@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

For unconnected UDP sockets using a VRF device lookup source address
based on VRF table. This allows the UDP header to be properly setup
before showing up at the VRF device via the dst.
Signed-off-by: Shrijeet Mukherjee <shm@cumulusnetworks.com>
Signed-off-by: David Ahern <dsa@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

As with ingress use the index of VRF master device for route lookups on
egress. However, the oif should only be used to direct the lookups to a
specific table. Routes in the table are not based on the VRF device but
rather interfaces that are part of the VRF so do not consider the oif for
lookups within the table. The FLOWI_FLAG_VRFSRC is used to control this
latter part.
Signed-off-by: Shrijeet Mukherjee <shm@cumulusnetworks.com>
Signed-off-by: David Ahern <dsa@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

On ingress use index of VRF master device for route lookups if real device
is enslaved. Rules are expected to be installed for the VRF device to
direct lookups to a specific table.
Signed-off-by: Shrijeet Mukherjee <shm@cumulusnetworks.com>
Signed-off-by: David Ahern <dsa@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Add a VRF_MASTER flag for interfaces and helper functions for determining
if a device is a VRF_MASTER.

Add link attribute for passing VRF_TABLE id.

Add vrf_ptr to netdevice.

Add various macros for determining if a device is a VRF device, the index
of the master VRF device and table associated with VRF device.
Signed-off-by: Shrijeet Mukherjee <shm@cumulusnetworks.com>
Signed-off-by: David Ahern <dsa@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

This is useful information to include in ipv6 netlink messages that
report interface information.  IFLA_OPERSTATE is already included in
ipv4 messages, but missing for ipv6.  This closes that gap.
Signed-off-by: Andy Gospodarek <gospo@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Commit 10e4ea75 ("net: Fix race condition in store_rps_map") has moved the
manipulation of the rps_needed jump label under a spinlock. Since changing
the state of a jump label may sleep this is incorrect and causes warnings
during runtime.

Make rps_map_lock a mutex to allow sleeping under it.

Fixes: 10e4ea75 ("net: Fix race condition in store_rps_map")
Signed-off-by: Sasha Levin <sasha.levin@oracle.com>
Acked-by: Tom Herbert <tom@herbertland.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Vivien Didelot says:

====================
net: dsa: mv88e6xxx: add hardware VLAN support

This patchset brings support to access hardware VLAN entries in DSA and
mv88e6xxx, through switchdev VLAN objects.

In the following example, ports swp[0-2] belong to bridge br0, and ports
swp[3-4] belong to bridge br1. Here's an example of what can be achieved
after this patchset:

    # bridge vlan add dev swp1 vid 100 master
    # bridge vlan add dev swp2 vid 100 master
    # bridge vlan add dev swp3 vid 100 master
    # bridge vlan add dev swp4 vid 100 master
    # bridge vlan del dev swp1 vid 100 master

The above commands correctly programmed hardware VLAN 100 for port swp2,
while ports swp3 and swp4 use software VLAN 100, as shown with:

    # bridge vlan
    port	vlan ids
    swp0	None
    swp0
    swp1	None
    swp1
    swp2	 100

    swp2	 100

    swp3	 100

    swp3
    swp4	 100

    swp4
    br0	None
    br1	None

Assuming that port 5 is the CPU port, the hardware VLAN table would
contain the following data:

    VID  FID  SID  0  1  2  3  4  5  6
    100    8    0  x  x  t  x  x  t  x

Where 'x' means excluded, and 't' means tagged.

Also, adding an FDB entry to VLAN 100 for port swp2 like this:

    # bridge fdb add 3c:97:0e:11:6e:30 dev swp2 vlan 100

Would result in the following example output:

    # bridge fdb
    # 01:00:5e:00:00:01 dev eth0 self permanent
    # 01:00:5e:00:00:01 dev eth1 self permanent
    # 00:50:d2:10:78:15 dev swp0 master br0 permanent
    # 00:50:d2:10:78:15 dev swp2 vlan 100 master br0 permanent
    # 3c:97:0e:11:6e:30 dev swp2 vlan 100 self static
    # 00:50:d2:10:78:15 dev swp3 master br1 permanent
    # 00:50:d2:10:78:15 dev swp3 vlan 100 master br1 permanent

And the Address Translation Unit would contain:

    DB   T/P  Vec State Addr
    008  Port 004   e   3c:97:0e:11:6e:30
====================
Signed-off-by: David S. Miller <davem@davemloft.net>

This commit changes the 802.1Q mode of each port from Disabled to
Secure. This enables the VLAN support, by checking the VTU entries on
ingress.
Signed-off-by: Vivien Didelot <vivien.didelot@savoirfairelinux.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Implement port_pvid_set and port_vlan_add to add new entries in the VLAN
hardware table, and join ports to them.

The patch also implement the STU Get Next and Load Purge operations,
since it is required to have a valid STU entry for at least all VLANs.

Each VLAN has its own forwarding database, with FID num_ports+1 to 4095.
Signed-off-by: Vivien Didelot <vivien.didelot@savoirfairelinux.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Add support for the VTU Load Purge operation and implement the
port_vlan_del driver function to remove a port from a VLAN entry, and
delete the VLAN if the given port was its last member.
Signed-off-by: Vivien Didelot <vivien.didelot@savoirfairelinux.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Add an helper function to read the next valid VLAN entry for a given
port. It is used in the VID to FID conversion function to retrieve the
forwarding database assigned to a given VLAN port.

Finally update the FDB getnext operation to iterate on the next valid
port VLAN when the end of the current database is reached.
Signed-off-by: Vivien Didelot <vivien.didelot@savoirfairelinux.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Implement the port_pvid_get and vlan_getnext driver functions required
to dump VLAN entries from the hardware, with the VTU Get Next operation.

Some functions and structure will be shared with STU operations, since
their table format are similar (e.g. STU data entries are accessible
with the same registers as VTU entries, except with an offset of 2).
Signed-off-by: Vivien Didelot <vivien.didelot@savoirfairelinux.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Implement the VTU Flush operation (which also flushes the STU), so that
warm boots won't preserved old entries.
Signed-off-by: Vivien Didelot <vivien.didelot@savoirfairelinux.com>
Signed-off-by: David S. Miller <davem@davemloft.net>