[PATCH bpf-next 0/2] bpf: Update h_proto of ethhdr when the outer protocol changed

[Ziyang Xuan <william.xuanziyang@huawei.com>]

When use bpf_skb_adjust_room() to encapsulate or decapsulate packet,
and outer protocol changed, we can update h_proto of ethhdr directly.

$./test_tc_tunnel.sh
ipip
encap 192.168.1.1 to 192.168.1.2, type ipip, mac none len 100
test basic connectivity
0
test bpf encap without decap (expect failure)
Ncat: TIMEOUT.
1
test bpf encap with tunnel device decap
0
test bpf encap with bpf decap
0
OK
ipip6
encap 192.168.1.1 to 192.168.1.2, type ipip6, mac none len 100
test basic connectivity
0
test bpf encap without decap (expect failure)
Ncat: TIMEOUT.
1
test bpf encap with tunnel device decap
0
test bpf encap with bpf decap
0
OK
ip6ip6
encap fd::1 to fd::2, type ip6tnl, mac none len 100
test basic connectivity
0
test bpf encap without decap (expect failure)
Ncat: TIMEOUT.
1
test bpf encap with tunnel device decap
0
test bpf encap with bpf decap
0
OK
sit
encap fd::1 to fd::2, type sit, mac none len 100
test basic connectivity
0
test bpf encap without decap (expect failure)
Ncat: TIMEOUT.
1
test bpf encap with tunnel device decap
0
test bpf encap with bpf decap
0
OK
...
OK. All tests passed

Ziyang Xuan (2):
  bpf: Update h_proto of ethhdr when the outer protocol changed
  selftests/bpf: Remove unnecessary codes for updating h_proto of ethhdr

 net/core/filter.c                             | 20 +++++++++++++------
 .../selftests/bpf/progs/test_tc_tunnel.c      | 18 -----------------
 2 files changed, 14 insertions(+), 24 deletions(-)

-- 
2.25.1