samples/bpf: extend test_tunnel_bpf.sh with ip6gre

Extend existing tests for vxlan, gre, geneve, ipip, erspan,
to include ip6 gre and gretap tunnel.

Signed-off-by: William Tu <u9012063@gmail.com>
Cc: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

samples/bpf/tcbpf2_kern.c

@@ -81,6 +81,49 @@ int _gre_get_tunnel(struct __sk_buff *skb)
 	return TC_ACT_OK;
 }
 
+SEC("ip6gretap_set_tunnel")
+int _ip6gretap_set_tunnel(struct __sk_buff *skb)
+{
+	struct bpf_tunnel_key key;
+	int ret;
+
+	__builtin_memset(&key, 0x0, sizeof(key));
+	key.remote_ipv6[3] = _htonl(0x11); /* ::11 */
+	key.tunnel_id = 2;
+	key.tunnel_tos = 0;
+	key.tunnel_ttl = 64;
+	key.tunnel_label = 0xabcde;
+
+	ret = bpf_skb_set_tunnel_key(skb, &key, sizeof(key),
+				     BPF_F_TUNINFO_IPV6 | BPF_F_ZERO_CSUM_TX);
+	if (ret < 0) {
+		ERROR(ret);
+		return TC_ACT_SHOT;
+	}
+
+	return TC_ACT_OK;
+}
+
+SEC("ip6gretap_get_tunnel")
+int _ip6gretap_get_tunnel(struct __sk_buff *skb)
+{
+	char fmt[] = "key %d remote ip6 ::%x label %x\n";
+	struct bpf_tunnel_key key;
+	int ret;
+
+	ret = bpf_skb_get_tunnel_key(skb, &key, sizeof(key),
+				     BPF_F_TUNINFO_IPV6);
+	if (ret < 0) {
+		ERROR(ret);
+		return TC_ACT_SHOT;
+	}
+
+	bpf_trace_printk(fmt, sizeof(fmt),
+			 key.tunnel_id, key.remote_ipv6[3], key.tunnel_label);
+
+	return TC_ACT_OK;
+}
+
 SEC("erspan_set_tunnel")
 int _erspan_set_tunnel(struct __sk_buff *skb)
 {

samples/bpf/test_tunnel_bpf.sh

@@ -33,6 +33,30 @@ function add_gre_tunnel {
 	ip addr add dev $DEV 10.1.1.200/24
 }
 
+function add_ip6gretap_tunnel {
+
+	# assign ipv6 address
+	ip netns exec at_ns0 ip addr add ::11/96 dev veth0
+	ip netns exec at_ns0 ip link set dev veth0 up
+	ip addr add dev veth1 ::22/96
+	ip link set dev veth1 up
+
+	# in namespace
+	ip netns exec at_ns0 \
+		ip link add dev $DEV_NS type $TYPE flowlabel 0xbcdef key 2 \
+		local ::11 remote ::22
+
+	ip netns exec at_ns0 ip addr add dev $DEV_NS 10.1.1.100/24
+	ip netns exec at_ns0 ip addr add dev $DEV_NS fc80::100/96
+	ip netns exec at_ns0 ip link set dev $DEV_NS up
+
+	# out of namespace
+	ip link add dev $DEV type $TYPE external
+	ip addr add dev $DEV 10.1.1.200/24
+	ip addr add dev $DEV fc80::200/24
+	ip link set dev $DEV up
+}
+
 function add_erspan_tunnel {
 	# in namespace
 	ip netns exec at_ns0 \
@@ -113,6 +137,41 @@ function test_gre {
 	cleanup
 }
 
+function test_ip6gre {
+	TYPE=ip6gre
+	DEV_NS=ip6gre00
+	DEV=ip6gre11
+	config_device
+	# reuse the ip6gretap function
+	add_ip6gretap_tunnel
+	attach_bpf $DEV ip6gretap_set_tunnel ip6gretap_get_tunnel
+	# underlay
+	ping6 -c 4 ::11
+	# overlay: ipv4 over ipv6
+	ip netns exec at_ns0 ping -c 1 10.1.1.200
+	ping -c 1 10.1.1.100
+	# overlay: ipv6 over ipv6
+	ip netns exec at_ns0 ping6 -c 1 fc80::200
+	cleanup
+}
+
+function test_ip6gretap {
+	TYPE=ip6gretap
+	DEV_NS=ip6gretap00
+	DEV=ip6gretap11
+	config_device
+	add_ip6gretap_tunnel
+	attach_bpf $DEV ip6gretap_set_tunnel ip6gretap_get_tunnel
+	# underlay
+	ping6 -c 4 ::11
+	# overlay: ipv4 over ipv6
+	ip netns exec at_ns0 ping -i .2 -c 1 10.1.1.200
+	ping -c 1 10.1.1.100
+	# overlay: ipv6 over ipv6
+	ip netns exec at_ns0 ping6 -c 1 fc80::200
+	cleanup
+}
+
 function test_erspan {
 	TYPE=erspan
 	DEV_NS=erspan00
@@ -175,6 +234,8 @@ function cleanup {
 	ip link del veth1
 	ip link del ipip11
 	ip link del gretap11
+	ip link del ip6gre11
+	ip link del ip6gretap11
 	ip link del vxlan11
 	ip link del geneve11
 	ip link del erspan11
@@ -187,6 +248,10 @@ trap cleanup 0 2 3 6 9
 cleanup
 echo "Testing GRE tunnel..."
 test_gre
+echo "Testing IP6GRE tunnel..."
+test_ip6gre
+echo "Testing IP6GRETAP tunnel..."
+test_ip6gretap
 echo "Testing ERSPAN tunnel..."
 test_erspan
 echo "Testing VXLAN tunnel..."