tree c1e80bcbc7c1c0bb7792e1ac5fb4b0aa690bb633
parent 110539e95710402f2c469d774c24d1764059dae0
author Subash Abhinov Kasiviswanathan <subashab@codeaurora.org> 1445906704 -0600
committer Subash Abhinov Kasiviswanathan <subashab@codeaurora.org> 1447619744 -0700

clatd: Relay checksum information from packet socket to TUN interface

With this change, we can notify network stack to disable checksum
validation for GRO packets as well as other packets which have
checksum validation completed earlier in a driver.

GRO packets have the ip_summed field set to CHECKSUM_PARTIAL while
checksum offloaded packets have the ip_summed field as
CHECKSUM_UNNECESSARY. Kernel copies this ip_summed field to the
status field in the tpacket filter. The information from the status
field is then passed as part of the TUN header to the TUN interface.

Any other packet will have the complete checksum validation done
in the network stack. Note that this only applies to packets which
are captured in packet sockets and passed onto the TUN interface.

Change-Id: I536c0356cbbf30fed7ecda5fdd0d38fa0dfd7bf3