diff mbox series

[bpf-next,2/2] selftests/bpf: Add BPF_F_NO_TUNNEL_KEY test

Message ID 20221218051734.31411-2-cehrig@cloudflare.com
State New
Headers
Series [bpf-next,1/2] bpf: Add flag BPF_F_NO_TUNNEL_KEY to bpf_skb_set_tunnel_key() |

Commit Message

Christian Ehrig Dec. 18, 2022, 5:17 a.m. UTC 
  This patch adds a selftest simulating a GRE sender and receiver using
tunnel headers without tunnel keys. It validates if packets encapsulated
using BPF_F_NO_TUNNEL_KEY are decapsulated by a GRE receiver not
configured with tunnel keys.

Signed-off-by: Christian Ehrig <cehrig@cloudflare.com>
---
 .../selftests/bpf/progs/test_tunnel_kern.c    | 21 ++++++++++
 tools/testing/selftests/bpf/test_tunnel.sh    | 40 +++++++++++++++++--
 2 files changed, 58 insertions(+), 3 deletions(-)

Comments

Stanislav Fomichev Dec. 19, 2022, 6:41 p.m. UTC | #1 
On 12/18, Christian Ehrig wrote:
> This patch adds a selftest simulating a GRE sender and receiver using
> tunnel headers without tunnel keys. It validates if packets encapsulated
> using BPF_F_NO_TUNNEL_KEY are decapsulated by a GRE receiver not
> configured with tunnel keys.

> Signed-off-by: Christian Ehrig <cehrig@cloudflare.com>

Acked-by: Stanislav Fomichev <sdf@google.com>

> ---
>   .../selftests/bpf/progs/test_tunnel_kern.c    | 21 ++++++++++
>   tools/testing/selftests/bpf/test_tunnel.sh    | 40 +++++++++++++++++--
>   2 files changed, 58 insertions(+), 3 deletions(-)

> diff --git a/tools/testing/selftests/bpf/progs/test_tunnel_kern.c  
> b/tools/testing/selftests/bpf/progs/test_tunnel_kern.c
> index 98af55f0bcd3..508da4a23c4f 100644
> --- a/tools/testing/selftests/bpf/progs/test_tunnel_kern.c
> +++ b/tools/testing/selftests/bpf/progs/test_tunnel_kern.c
> @@ -81,6 +81,27 @@ int gre_set_tunnel(struct __sk_buff *skb)
>   	return TC_ACT_OK;
>   }

> +SEC("tc")
> +int gre_set_tunnel_no_key(struct __sk_buff *skb)
> +{
> +	int ret;
> +	struct bpf_tunnel_key key;
> +
> +	__builtin_memset(&key, 0x0, sizeof(key));
> +	key.remote_ipv4 = 0xac100164; /* 172.16.1.100 */
> +	key.tunnel_ttl = 64;
> +
> +	ret = bpf_skb_set_tunnel_key(skb, &key, sizeof(key),
> +				     BPF_F_ZERO_CSUM_TX | BPF_F_SEQ_NUMBER |
> +				     BPF_F_NO_TUNNEL_KEY);
> +	if (ret < 0) {
> +		log_err(ret);
> +		return TC_ACT_SHOT;
> +	}
> +
> +	return TC_ACT_OK;
> +}
> +
>   SEC("tc")
>   int gre_get_tunnel(struct __sk_buff *skb)
>   {
> diff --git a/tools/testing/selftests/bpf/test_tunnel.sh  
> b/tools/testing/selftests/bpf/test_tunnel.sh
> index 2eaedc1d9ed3..06857b689c11 100755
> --- a/tools/testing/selftests/bpf/test_tunnel.sh
> +++ b/tools/testing/selftests/bpf/test_tunnel.sh
> @@ -66,15 +66,20 @@ config_device()

>   add_gre_tunnel()
>   {
> +	tun_key=
> +	if [ -n "$1" ]; then
> +		tun_key="key $1"
> +	fi
> +
>   	# at_ns0 namespace
>   	ip netns exec at_ns0 \
> -        ip link add dev $DEV_NS type $TYPE seq key 2 \
> +        ip link add dev $DEV_NS type $TYPE seq $tun_key \
>   		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

>   	# root namespace
> -	ip link add dev $DEV type $TYPE key 2 external
> +	ip link add dev $DEV type $TYPE $tun_key external
>   	ip link set dev $DEV up
>   	ip addr add dev $DEV 10.1.1.200/24
>   }
> @@ -238,7 +243,7 @@ test_gre()

>   	check $TYPE
>   	config_device
> -	add_gre_tunnel
> +	add_gre_tunnel 2
>   	attach_bpf $DEV gre_set_tunnel gre_get_tunnel
>   	ping $PING_ARG 10.1.1.100
>   	check_err $?
> @@ -253,6 +258,30 @@ test_gre()
>           echo -e ${GREEN}"PASS: $TYPE"${NC}
>   }

> +test_gre_no_tunnel_key()
> +{
> +	TYPE=gre
> +	DEV_NS=gre00
> +	DEV=gre11
> +	ret=0
> +
> +	check $TYPE
> +	config_device
> +	add_gre_tunnel
> +	attach_bpf $DEV gre_set_tunnel_no_key gre_get_tunnel
> +	ping $PING_ARG 10.1.1.100
> +	check_err $?
> +	ip netns exec at_ns0 ping $PING_ARG 10.1.1.200
> +	check_err $?
> +	cleanup
> +
> +        if [ $ret -ne 0 ]; then
> +                echo -e ${RED}"FAIL: $TYPE"${NC}
> +                return 1
> +        fi
> +        echo -e ${GREEN}"PASS: $TYPE"${NC}
> +}
> +
>   test_ip6gre()
>   {
>   	TYPE=ip6gre
> @@ -589,6 +618,7 @@ cleanup()
>   	ip link del ipip6tnl11 2> /dev/null
>   	ip link del ip6ip6tnl11 2> /dev/null
>   	ip link del gretap11 2> /dev/null
> +	ip link del gre11 2> /dev/null
>   	ip link del ip6gre11 2> /dev/null
>   	ip link del ip6gretap11 2> /dev/null
>   	ip link del geneve11 2> /dev/null
> @@ -641,6 +671,10 @@ bpf_tunnel_test()
>   	test_gre
>   	errors=$(( $errors + $? ))

> +	echo "Testing GRE tunnel (without tunnel keys)..."
> +	test_gre_no_tunnel_key
> +	errors=$(( $errors + $? ))
> +
>   	echo "Testing IP6GRE tunnel..."
>   	test_ip6gre
>   	errors=$(( $errors + $? ))
> --
> 2.37.4
Jakub Sitnicki Dec. 19, 2022, 9:26 p.m. UTC | #2 
On Sun, Dec 18, 2022 at 06:17 AM +01, Christian Ehrig wrote:
> This patch adds a selftest simulating a GRE sender and receiver using
> tunnel headers without tunnel keys. It validates if packets encapsulated
> using BPF_F_NO_TUNNEL_KEY are decapsulated by a GRE receiver not
> configured with tunnel keys.
>
> Signed-off-by: Christian Ehrig <cehrig@cloudflare.com>
> ---

Reviewed-by: Jakub Sitnicki <jakub@cloudflare.com>
diff mbox series

Patch

diff --git a/tools/testing/selftests/bpf/progs/test_tunnel_kern.c b/tools/testing/selftests/bpf/progs/test_tunnel_kern.c
index 98af55f0bcd3..508da4a23c4f 100644
--- a/tools/testing/selftests/bpf/progs/test_tunnel_kern.c
+++ b/tools/testing/selftests/bpf/progs/test_tunnel_kern.c
@@ -81,6 +81,27 @@  int gre_set_tunnel(struct __sk_buff *skb)
 	return TC_ACT_OK;
 }
 
+SEC("tc")
+int gre_set_tunnel_no_key(struct __sk_buff *skb)
+{
+	int ret;
+	struct bpf_tunnel_key key;
+
+	__builtin_memset(&key, 0x0, sizeof(key));
+	key.remote_ipv4 = 0xac100164; /* 172.16.1.100 */
+	key.tunnel_ttl = 64;
+
+	ret = bpf_skb_set_tunnel_key(skb, &key, sizeof(key),
+				     BPF_F_ZERO_CSUM_TX | BPF_F_SEQ_NUMBER |
+				     BPF_F_NO_TUNNEL_KEY);
+	if (ret < 0) {
+		log_err(ret);
+		return TC_ACT_SHOT;
+	}
+
+	return TC_ACT_OK;
+}
+
 SEC("tc")
 int gre_get_tunnel(struct __sk_buff *skb)
 {
diff --git a/tools/testing/selftests/bpf/test_tunnel.sh b/tools/testing/selftests/bpf/test_tunnel.sh
index 2eaedc1d9ed3..06857b689c11 100755
--- a/tools/testing/selftests/bpf/test_tunnel.sh
+++ b/tools/testing/selftests/bpf/test_tunnel.sh
@@ -66,15 +66,20 @@  config_device()
 
 add_gre_tunnel()
 {
+	tun_key=
+	if [ -n "$1" ]; then
+		tun_key="key $1"
+	fi
+
 	# at_ns0 namespace
 	ip netns exec at_ns0 \
-        ip link add dev $DEV_NS type $TYPE seq key 2 \
+        ip link add dev $DEV_NS type $TYPE seq $tun_key \
 		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
 
 	# root namespace
-	ip link add dev $DEV type $TYPE key 2 external
+	ip link add dev $DEV type $TYPE $tun_key external
 	ip link set dev $DEV up
 	ip addr add dev $DEV 10.1.1.200/24
 }
@@ -238,7 +243,7 @@  test_gre()
 
 	check $TYPE
 	config_device
-	add_gre_tunnel
+	add_gre_tunnel 2
 	attach_bpf $DEV gre_set_tunnel gre_get_tunnel
 	ping $PING_ARG 10.1.1.100
 	check_err $?
@@ -253,6 +258,30 @@  test_gre()
         echo -e ${GREEN}"PASS: $TYPE"${NC}
 }
 
+test_gre_no_tunnel_key()
+{
+	TYPE=gre
+	DEV_NS=gre00
+	DEV=gre11
+	ret=0
+
+	check $TYPE
+	config_device
+	add_gre_tunnel
+	attach_bpf $DEV gre_set_tunnel_no_key gre_get_tunnel
+	ping $PING_ARG 10.1.1.100
+	check_err $?
+	ip netns exec at_ns0 ping $PING_ARG 10.1.1.200
+	check_err $?
+	cleanup
+
+        if [ $ret -ne 0 ]; then
+                echo -e ${RED}"FAIL: $TYPE"${NC}
+                return 1
+        fi
+        echo -e ${GREEN}"PASS: $TYPE"${NC}
+}
+
 test_ip6gre()
 {
 	TYPE=ip6gre
@@ -589,6 +618,7 @@  cleanup()
 	ip link del ipip6tnl11 2> /dev/null
 	ip link del ip6ip6tnl11 2> /dev/null
 	ip link del gretap11 2> /dev/null
+	ip link del gre11 2> /dev/null
 	ip link del ip6gre11 2> /dev/null
 	ip link del ip6gretap11 2> /dev/null
 	ip link del geneve11 2> /dev/null
@@ -641,6 +671,10 @@  bpf_tunnel_test()
 	test_gre
 	errors=$(( $errors + $? ))
 
+	echo "Testing GRE tunnel (without tunnel keys)..."
+	test_gre_no_tunnel_key
+	errors=$(( $errors + $? ))
+
 	echo "Testing IP6GRE tunnel..."
 	test_ip6gre
 	errors=$(( $errors + $? ))