samples/bpf: Add tunnel set/get tests.

The patch creates sample code exercising bpf_skb_{set,get}_tunnel_key,
and bpf_skb_{set,get}_tunnel_opt for GRE, VXLAN, and GENEVE.  A native
tunnel device is created in a namespace to interact with a lwtunnel
device out of the namespace, with metadata enabled.  The bpf_skb_set_*
program is attached to tc egress and bpf_skb_get_* is attached to egress
qdisc.  A ping between two tunnels is used to verify correctness and
the result of bpf_skb_get_* printed by bpf_trace_printk.

Signed-off-by: William Tu <u9012063@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 127 insertions, 0 deletions

diff --git a/samples/bpf/test_tunnel_bpf.sh b/samples/bpf/test_tunnel_bpf.sh
new file mode 100755
index 000000000000..4956589a83ae
--- /dev/null
+++ b/samples/bpf/test_tunnel_bpf.sh
@@ -0,0 +1,127 @@
+#!/bin/bash
+# In Namespace 0 (at_ns0) using native tunnel
+# Overlay IP: 10.1.1.100
+# local 192.16.1.100 remote 192.16.1.200
+# veth0 IP: 172.16.1.100, tunnel dev <type>00
+
+# Out of Namespace using BPF set/get on lwtunnel
+# Overlay IP: 10.1.1.200
+# local 172.16.1.200 remote 172.16.1.100
+# veth1 IP: 172.16.1.200, tunnel dev <type>11
+
+set -e
+
+function config_device {
+	ip netns add at_ns0
+	ip link add veth0 type veth peer name veth1
+	ip link set veth0 netns at_ns0
+	ip netns exec at_ns0 ip addr add 172.16.1.100/24 dev veth0
+	ip netns exec at_ns0 ip link set dev veth0 up
+	ip link set dev veth1 up
+	ip addr add dev veth1 172.16.1.200/24
+}
+
+function add_gre_tunnel {
+	# in namespace
+	ip netns exec at_ns0 \
+		ip link add dev $DEV_NS type $TYPE key 2 local 172.16.1.100 remote 172.16.1.200
+	ip netns exec at_ns0 ip link set dev $DEV_NS up
+	ip netns exec at_ns0 ip addr add dev $DEV_NS 10.1.1.100/24
+
+	# out of namespace
+	ip link add dev $DEV type $TYPE key 2 external
+	ip link set dev $DEV up
+	ip addr add dev $DEV 10.1.1.200/24
+}
+
+function add_vxlan_tunnel {
+	# Set static ARP entry here because iptables set-mark works
+	# on L3 packet, as a result not applying to ARP packets,
+	# causing errors at get_tunnel_{key/opt}.
+
+	# in namespace
+	ip netns exec at_ns0 \
+		ip link add dev $DEV_NS type $TYPE id 2 dstport 4789 gbp remote 172.16.1.200
+	ip netns exec at_ns0 ip link set dev $DEV_NS address 52:54:00:d9:01:00 up
+	ip netns exec at_ns0 ip addr add dev $DEV_NS 10.1.1.100/24
+	ip netns exec at_ns0 arp -s 10.1.1.200 52:54:00:d9:02:00
+	ip netns exec at_ns0 iptables -A OUTPUT -j MARK --set-mark 0x800FF
+
+	# out of namespace
+	ip link add dev $DEV type $TYPE external gbp dstport 4789
+	ip link set dev $DEV address 52:54:00:d9:02:00 up
+	ip addr add dev $DEV 10.1.1.200/24
+	arp -s 10.1.1.100 52:54:00:d9:01:00
+}
+
+function add_geneve_tunnel {
+	# in namespace
+	ip netns exec at_ns0 \
+		ip link add dev $DEV_NS type $TYPE id 2 dstport 6081 remote 172.16.1.200
+	ip netns exec at_ns0 ip link set dev $DEV_NS up
+	ip netns exec at_ns0 ip addr add dev $DEV_NS 10.1.1.100/24
+
+	# out of namespace
+	ip link add dev $DEV type $TYPE dstport 6081 external
+	ip link set dev $DEV up
+	ip addr add dev $DEV 10.1.1.200/24
+}
+
+function attach_bpf {
+	DEV=$1
+	SET_TUNNEL=$2
+	GET_TUNNEL=$3
+	tc qdisc add dev $DEV clsact
+	tc filter add dev $DEV egress bpf da obj tcbpf2_kern.o sec $SET_TUNNEL
+	tc filter add dev $DEV ingress bpf da obj tcbpf2_kern.o sec $GET_TUNNEL
+}
+
+function test_gre {
+	TYPE=gretap
+	DEV_NS=gretap00
+	DEV=gretap11
+	config_device
+	add_gre_tunnel
+	attach_bpf $DEV gre_set_tunnel gre_get_tunnel
+	ping -c 1 10.1.1.100
+	ip netns exec at_ns0 ping -c 1 10.1.1.200
+}
+
+function test_vxlan {
+	TYPE=vxlan
+	DEV_NS=vxlan00
+	DEV=vxlan11
+	config_device
+	add_vxlan_tunnel
+	attach_bpf $DEV vxlan_set_tunnel vxlan_get_tunnel
+	ping -c 1 10.1.1.100
+	ip netns exec at_ns0 ping -c 1 10.1.1.200
+}
+
+function test_geneve {
+	TYPE=geneve
+	DEV_NS=geneve00
+	DEV=geneve11
+	config_device
+	add_geneve_tunnel
+	attach_bpf $DEV geneve_set_tunnel geneve_get_tunnel
+	ping -c 1 10.1.1.100
+	ip netns exec at_ns0 ping -c 1 10.1.1.200
+}
+
+function cleanup {
+	ip netns delete at_ns0
+	ip link del veth1
+	ip link del $DEV
+}
+
+echo "Testing GRE tunnel..."
+test_gre
+cleanup
+echo "Testing VXLAN tunnel..."
+test_vxlan
+cleanup
+echo "Testing GENEVE tunnel..."
+test_geneve
+cleanup
+echo "Success"