[bpf-next,v2,03/13] selftests/bpf: expand bpf tunnel test with decap
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Message ID 20190322151504.89983-4-willemdebruijn.kernel@gmail.com
State Changes Requested
Headers show
Series
  • bpf tc tunneling
Related show

Commit Message

Willem de Bruijn March 22, 2019, 3:14 p.m. UTC
From: Willem de Bruijn <willemb@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 <willemb@google.com>
---
 .../selftests/bpf/progs/test_tc_tunnel.c      | 31 +++++++++++++++++++
 tools/testing/selftests/bpf/test_tc_tunnel.sh |  9 ++++++
 2 files changed, 40 insertions(+)

Patch
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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