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selftests/bpf: expand bpf tunnel test with decap

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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: Willem de Bruijn <willemb@google.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Willem de Bruijn 2019-03-22 14:32:50 -04:00 committed by Alexei Starovoitov
parent 98cdabcd07
commit ccd34cd357
2 changed files with 40 additions and 0 deletions
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31
tools/testing/selftests/bpf/progs/test_tc_tunnel.c
View File

@ -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";

9
tools/testing/selftests/bpf/test_tc_tunnel.sh
View File

@ -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