From: Willem de Bruijn <will...@google.com>
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 <will...@google.com>
---
.../selftests/bpf/progs/test_tc_tunnel.c | 31 +++++++++++++++++++
tools/testing/selftests/bpf/test_tc_tunnel.sh | 9 ++++++
2 files changed, 40 insertions(+)
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";
diff --git a/tools/testing/selftests/bpf/test_tc_tunnel.sh
b/tools/testing/selftests/bpf/test_tc_tunnel.sh
index 6ebb288a3afc..91151d91e5a1 100755
--- a/tools/testing/selftests/bpf/test_tc_tunnel.sh
+++ b/tools/testing/selftests/bpf/test_tc_tunnel.sh
@@ -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
--
2.21.0.392.gf8f6787159e-goog
