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
