diff options
Diffstat (limited to 'tools/testing/selftests/bpf/progs/test_tc_tunnel.c')
| -rw-r--r-- | tools/testing/selftests/bpf/progs/test_tc_tunnel.c | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/tools/testing/selftests/bpf/progs/test_tc_tunnel.c b/tools/testing/selftests/bpf/progs/test_tc_tunnel.c index 8223e4347be8..25db148635ab 100644 --- a/tools/testing/selftests/bpf/progs/test_tc_tunnel.c +++ b/tools/testing/selftests/bpf/progs/test_tc_tunnel.c @@ -80,4 +80,35 @@ int encap_f(struct __sk_buff *skb) return TC_ACT_OK; } +SEC("decap") +int decap_f(struct __sk_buff *skb) +{ + struct iphdr iph_outer, iph_inner; + + if (skb->protocol != __bpf_constant_htons(ETH_P_IP)) + return TC_ACT_OK; + + if (bpf_skb_load_bytes(skb, ETH_HLEN, &iph_outer, + sizeof(iph_outer)) < 0) + return TC_ACT_OK; + + if (iph_outer.ihl != 5 || iph_outer.protocol != IPPROTO_IPIP) + return TC_ACT_OK; + + if (bpf_skb_load_bytes(skb, ETH_HLEN + sizeof(iph_outer), + &iph_inner, sizeof(iph_inner)) < 0) + return TC_ACT_OK; + + if (bpf_skb_adjust_room(skb, -(int)sizeof(iph_outer), + BPF_ADJ_ROOM_NET, 0)) + return TC_ACT_SHOT; + + /* bpf_skb_adjust_room has moved outer over inner header: restore */ + if (bpf_skb_store_bytes(skb, ETH_HLEN, &iph_inner, sizeof(iph_inner), + BPF_F_INVALIDATE_HASH) < 0) + return TC_ACT_SHOT; + + return TC_ACT_OK; +} + char __license[] SEC("license") = "GPL"; |