Commit ccd34cd3 authored by Willem de Bruijn's avatar Willem de Bruijn Committed by Alexei Starovoitov
Browse files

selftests/bpf: expand bpf tunnel test with decap 



The bpf tunnel test encapsulates using bpf, then decapsulates using
a standard tunnel device to verify correctness.

Once encap is verified, also test decap, by replacing the tunnel
device on decap with another bpf program.

Signed-off-by: default avatarWillem de Bruijn <willemb@google.com>
Signed-off-by: default avatarAlexei Starovoitov <ast@kernel.org>
parent 98cdabcd

tools/testing/selftests/bpf/progs/test_tc_tunnel.c

+31 −0
Original line number Diff line number Diff line
@@ -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";

tools/testing/selftests/bpf/test_tc_tunnel.sh

+9 −0
Original line number Diff line number Diff line
@@ -72,4 +72,13 @@ ip netns exec "${ns2}" ip link set dev testtun0 up 
echo "test bpf encap with tunnel device decap"

client_connect



# serverside, use BPF for decap

ip netns exec "${ns2}" ip link del dev testtun0

ip netns exec "${ns2}" tc qdisc add dev veth2 clsact

ip netns exec "${ns2}" tc filter add dev veth2 ingress \

	bpf direct-action object-file ./test_tc_tunnel.o section decap

server_listen

echo "test bpf encap with bpf decap"

client_connect



echo OK