netfilter: nf_ct_sip: don't drop packets with offsets pointing outside the packet

Some Cisco phones create huge messages that are spread over multiple packets.
After calculating the offset of the SIP body, it is validated to be within
the packet and the packet is dropped otherwise. This breaks operation of
these phones. Since connection tracking is supposed to be passive, just let
those packets pass unmodified and untracked.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

Conflicts:
	net/netfilter/nf_conntrack_sip.c

This commit appears in the 3.8 and 3.9 branches of the Linux kernel
and according to feanor3 on xda-developers:

The "Cisco Jabber" app lets you use your cell phone as a SIP
endpoint with your work number on a Cisco phone system. The
registration packets that Cisco uses are apparently larger
than normal. With your kernel, the registration does not complete.
With your kernel and line 1421 changed to NF_ACCEPT, the registration
complete

Change-Id: If0c4eff68fa10af43767ad49808394910cae4309
filter multicast packages while suspended.

in some crowded WLANs, with a lot of multicast packages circulating,
the device would not enter deep sleep.
this will allow the device to enter deep sleep.

Change-Id: I72cfefe89af64a7152e644d5095a57823ef04f4e
Merge branch 'cm-11.0' of git://github.com/CyanogenMod/android_kernel_samsung_smdk4412 into kbc-cyanogen-cm-11.0
Merge "filter multicast packages while suspended." into cm-11.0
Merge branch 'cm-11.0' of git://github.com/CyanogenMod/android_kernel_samsung_smdk4412 into kbc-cyanogen-cm-11.0
Merge branch 'kbc-cyanogen-cm-11.0' of github.com:kbc-developers/kernel_samsung_exynos4412 into kbc-cyanogen-cm-11.0
Fix light sensors for GT-N5100

Change-Id: Ifd1bd76ec2ebf8014107747474145d0bfc9a3281
Merge branch 'cm-11.0' of github.com:CyanogenMod/android_kernel_samsung_smdk4412 into cm-11.0
Fix proximity sensor for GT-N5100

Change-Id: Ic5542259e9ff91ba20216844cf8a65f4a252c111
Merge "netfilter: nf_ct_sip: don't drop packets with offsets pointing outside the packet" into cm-11.0
Merge branch 'cm-11.0' of github.com:CyanogenMod/android_kernel_samsung_smdk4412 into cm-11.0
Merge "Fix proximity sensor for GT-N5100" into cm-11.0
Merge branch 'cm-11.0' of github.com:CyanogenMod/android_kernel_samsung_smdk4412 into cm-11.0
smdk4412: initial support for n5120

Change-Id: I21144c9f3146c9043b137f180c064627ebeed71e
Merge remote-tracking branch 'kbc/kbc-cyanogen-cm-11.0' into cm-11.0
Merge remote-tracking branch 'cm/cm-11.0' into cm-11.0