netfilter: xtables: idletimer target implementation

This patch implements an idletimer Xtables target that can be used to
identify when interfaces have been idle for a certain period of time.

Timers are identified by labels and are created when a rule is set with a new
label.  The rules also take a timeout value (in seconds) as an option.  If
more than one rule uses the same timer label, the timer will be restarted
whenever any of the rules get a hit.

One entry for each timer is created in sysfs.  This attribute contains the
timer remaining for the timer to expire.  The attributes are located under
the xt_idletimer class:

/sys/class/xt_idletimer/timers/<label>

When the timer expires, the target module sends a sysfs notification to the
userspace, which can then decide what to do (eg. disconnect to save power).

Cc: Timo Teras <timo.teras@iki.fi>
Signed-off-by: Luciano Coelho <luciano.coelho@nokia.com>
Signed-off-by: Patrick McHardy <kaber@trash.net>
netfilter: xt_IDLETIMER needs kdev_t.h

Add header file to fix build error:
net/netfilter/xt_IDLETIMER.c:276: error: implicit declaration of function 'MKDEV'

Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com>
Signed-off-by: Patrick McHardy <kaber@trash.net>
netfilter: add xt_cpu match

In some situations a CPU match permits a better spreading of
connections, or select targets only for a given cpu.

With Remote Packet Steering or multiqueue NIC and appropriate IRQ
affinities, we can distribute trafic on available cpus, per session.
(all RX packets for a given flow is handled by a given cpu)

Some legacy applications being not SMP friendly, one way to scale a
server is to run multiple copies of them.

Instead of randomly choosing an instance, we can use the cpu number as a
key so that softirq handler for a whole instance is running on a single
cpu, maximizing cache effects in TCP/UDP stacks.

Using NAT for example, a four ways machine might run four copies of
server application, using a separate listening port for each instance,
but still presenting an unique external port :

iptables -t nat -A PREROUTING -p tcp --dport 80 -m cpu --cpu 0 \
        -j REDIRECT --to-port 8080

iptables -t nat -A PREROUTING -p tcp --dport 80 -m cpu --cpu 1 \
        -j REDIRECT --to-port 8081

iptables -t nat -A PREROUTING -p tcp --dport 80 -m cpu --cpu 2 \
        -j REDIRECT --to-port 8082

iptables -t nat -A PREROUTING -p tcp --dport 80 -m cpu --cpu 3 \
        -j REDIRECT --to-port 8083

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: Patrick McHardy <kaber@trash.net>
netfilter: xtables: add missing aliases for autoloading via iptables

Signed-off-by: Jan Engelhardt <jengelh@medozas.de>
xt_IDLETIMER:
Add new netlink msg type for IDLETIMER.

Send notifications when the label becomes active after an idle period.
Send netlink message notifications in addition to sysfs notifications.

Change-Id: I31677ef00c94b5f82c8457e5bf9e5e584c23c523
Signed-off-by: Ashish Sharma <ashishsharma@google.com>
Signed-off-by: scotthartbti <scott.hart.bti@gmail.com>

Conflicts:
	include/linux/netlink.h
netfilter: xt_IDLETIMER: Use uevent instead of new netlink msg type

Send netlink message notifications using a uevent with
  subsystem=xt_idletimer
  INTERFACE=...
  STATE={active,inactive}
instead of needing a new netlink message type.
Revert the netlink.h change added by commit
  beb914e987cbbd368988d2b94a6661cb907c4d5a

Change-Id: I6881936bf754f3367ff3c8f6c1e9661cec0357d4
Signed-off-by: JP Abgrall <jpa@google.com>
Signed-off-by: scotthartbti <scott.hart.bti@gmail.com>

Conflicts:
	include/linux/netlink.h
netfilter: xt_IDLETIMER: Rename INTERFACE to LABEL in netlink notification.

Signed-off-by: Ashish Sharma <ashishsharma@google.com>
CONFIG_NETFILTER_XT_TARGET_IDLETIMER=y
Signed-off-by: scotthartbti <scott.hart.bti@gmail.com>
USB: gadget: f_accessory: New gadget driver for android USB accesories

Signed-off-by: Mike Lockwood <lockwood@android.com>

USB: gadget: f_accessory: Misc improvements and cleanup:

- Add URI string

- Replace type string with a description string

- Add a control call to retrieve accessory protocol version (currently 1)

- Driver read() and write() calls now fail after USB disconnect until
  driver file is closed and reopened.

- Misc cleanup work

Signed-off-by: Mike Lockwood <lockwood@android.com>

USB: gadget: f_accessory: Clear accessory strings when USB is disconnected

Signed-off-by: Mike Lockwood <lockwood@android.com>

USB: gadget: f_accessory: Clear previous strings on ACCESSORY_GET_PROTOCOL

Clearing strings on disconnect does not work since we may receive
a disconnect on some devices when transitioning into accessory mode.
We require an accessory to send ACCESSORY_GET_PROTOCOL before
sending any strings, so any strings from a previous session will be cleared.

Signed-off-by: Mike Lockwood <lockwood@android.com>

USB: gadget: f_accessory: Clear disconnected flag when driver file is opened

Fixes a race condition that can occur when entering accessory mode.

Signed-off-by: Mike Lockwood <lockwood@android.com>

USB: gadget: f_accessory: Add string for accessory's unique serial number

Signed-off-by: Mike Lockwood <lockwood@android.com>

USB: gadget: f_accessory: Set bNumEndpoints to correct value of 2

Change-Id: I24f4e36f196d45436e0573301500c3b93215953d
Signed-off-by: Mike Lockwood <lockwood@android.com>
Signed-off-by: scotthartbti <scott.hart.bti@gmail.com>

Conflicts:
	drivers/usb/gadget/android.c
CONFIG_USB_ANDROID_ACCESSORY=y

Signed-off-by: scotthartbti <scott.hart.bti@gmail.com>
Make sure host is disabled on suspend.
Signed-off-by: scotthartbti <scott.hart.bti@gmail.com>
config: Set mmc block minors and deffered resume
Signed-off-by: scotthartbti <scott.hart.bti@gmail.com>
logger from 3.8
Signed-off-by: scotthartbti <scott.hart.bti@gmail.com>
Use asynchronous compaction for LMK processes
Signed-off-by: scotthartbti <scott.hart.bti@gmail.com>
LMK backport from 3.4 and also remove SEC_ADJUST_LMK crap
Signed-off-by: scotthartbti <scott.hart.bti@gmail.com>
Update/fix binder
Signed-off-by: scotthartbti <scott.hart.bti@gmail.com>
OOM rework and fixes for 2.6.35.7 (existz)
Fixes for backport of LMK
Signed-off-by: scotthartbti <scott.hart.bti@gmail.com>
backport lmk patches from codeaurora 3.4
Signed-off-by: scotthartbti <scott.hart.bti@gmail.com>
Revert "Update/fix binder"

This reverts commit b95c916b12144636e0ae5e06ff1ca9fab052138c.