BPF updates

This set contains various updates for eBPF, i.e. the addition of a generic csum helper function and other misc bits that mostly improve existing helpers and ease programming with eBPF on cls_bpf. For more details, please see individual patches.

Set is rebased on top of http://patchwork.ozlabs.org/patch/584465/.

Thanks!

Daniel Borkmann (6):
bpf: add new arg_type that allows for 0 sized stack buffer
bpf: add generic bpf_csum_diff helper
bpf: remove artificial bpf_skb_{load,store}_bytes buffer limitation
bpf: try harder on clones when writing into skb
bpf: fix csum update in bpf_l4_csum_replace helper for udp
bpf: don't emit mov A,A on return

 include/linux/bpf.h      |   1 +
 include/linux/skbuff.h   |   7 ++++
 include/uapi/linux/bpf.h |  12 ++++++
 kernel/bpf/verifier.c    |  42 ++++++++++++++-----
 net/core/filter.c        | 103 ++++++++++++++++++++++++++++++++++++++---------
 net/sched/act_csum.c     |   8 +---
 net/sched/act_nat.c      |  18 +++------
 7 files changed, 142 insertions(+), 49 deletions(-)

1.9.3