From: Willem de Bruijn <willemb@google.com>

Allow device-specific validation of link layer headers. Existing
checks drop all packets shorter than hard_header_len. For variable
length protocols, such packets can be valid.

patch 1 adds header_ops.validate and dev_validate_header
patch 2 replaces ll_header_truncated with dev_validate_header
patch 3 implements the protocol specific callback for AX25

Tested with a temporary eth_header_validate function. The AX25
code is compile-tested only at this point.

Willem de Bruijn (3):
  net: validate variable length ll headers
  packet: validate variable length ll headers
  ax25: add link layer header validation function

 include/linux/netdevice.h | 22 ++++++++++++++++++++--
 net/ax25/ax25_ip.c        | 15 +++++++++++++++
 net/packet/af_packet.c    | 38 +++++++++++++++++---------------------
 3 files changed, 52 insertions(+), 23 deletions(-)

-- 
2.7.0.rc3.207.g0ac5344