// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause

/*
 * End-to-end eBPF tunnel test suite
 *   The file tests BPF network tunnel implementation.
 *
 * Topology:
 * ---------
 *     root namespace   |     at_ns0 namespace
 *                       |
 *       -----------     |     -----------
 *       | tnl dev |     |     | tnl dev |  (overlay network)
 *       -----------     |     -----------
 *       metadata-mode   |     metadata-mode
 *        with bpf       |       with bpf
 *                       |
 *       ----------      |     ----------
 *       |  veth1  | --------- |  veth0  |  (underlay network)
 *       ----------    peer    ----------
 *
 *
 *  Device Configuration
 *  --------------------
 *  root namespace with metadata-mode tunnel + BPF
 *  Device names and addresses:
 *	veth1 IP 1: 172.16.1.200, IPv6: 00::22 (underlay)
 *		IP 2: 172.16.1.20, IPv6: 00::bb (underlay)
 *	tunnel dev <type>11, ex: gre11, IPv4: 10.1.1.200, IPv6: 1::22 (overlay)
 *
 *  Namespace at_ns0 with native tunnel
 *  Device names and addresses:
 *	veth0 IPv4: 172.16.1.100, IPv6: 00::11 (underlay)
 *	tunnel dev <type>00, ex: gre00, IPv4: 10.1.1.100, IPv6: 1::11 (overlay)
 *
 *
 * End-to-end ping packet flow
 *  ---------------------------
 *  Most of the tests start by namespace creation, device configuration,
 *  then ping the underlay and overlay network.  When doing 'ping 10.1.1.100'
 *  from root namespace, the following operations happen:
 *  1) Route lookup shows 10.1.1.100/24 belongs to tnl dev, fwd to tnl dev.
 *  2) Tnl device's egress BPF program is triggered and set the tunnel metadata,
 *     with local_ip=172.16.1.200, remote_ip=172.16.1.100. BPF program choose
 *     the primary or secondary ip of veth1 as the local ip of tunnel. The
 *     choice is made based on the value of bpf map local_ip_map.
 *  3) Outer tunnel header is prepended and route the packet to veth1's egress.
 *  4) veth0's ingress queue receive the tunneled packet at namespace at_ns0.
 *  5) Tunnel protocol handler, ex: vxlan_rcv, decap the packet.
 *  6) Forward the packet to the overlay tnl dev.
 */

#include <arpa/inet.h>
#include <linux/if_link.h>
#include <linux/if_tun.h>
#include <linux/limits.h>
#include <linux/sysctl.h>
#include <linux/time_types.h>
#include <linux/net_tstamp.h>
#include <net/if.h>
#include <stdbool.h>
#include <stdio.h>
#include <sys/stat.h>
#include <unistd.h>

#include "test_progs.h"
#include "network_helpers.h"
#include "test_tunnel_kern.skel.h"

#define IP4_ADDR_VETH0 "172.16.1.100"
#define IP4_ADDR1_VETH1 "172.16.1.200"
#define IP4_ADDR2_VETH1 "172.16.1.20"
#define IP4_ADDR_TUNL_DEV0 "10.1.1.100"
#define IP4_ADDR_TUNL_DEV1 "10.1.1.200"
#define IP6_ADDR_TUNL_DEV0 "fc80::100"
#define IP6_ADDR_TUNL_DEV1 "fc80::200"

#define IP6_ADDR_VETH0 "::11"
#define IP6_ADDR1_VETH1 "::22"
#define IP6_ADDR2_VETH1 "::bb"

#define IP4_ADDR1_HEX_VETH1 0xac1001c8
#define IP4_ADDR2_HEX_VETH1 0xac100114
#define IP6_ADDR1_HEX_VETH1 0x22
#define IP6_ADDR2_HEX_VETH1 0xbb

#define MAC_TUNL_DEV0 "52:54:00:d9:01:00"
#define MAC_TUNL_DEV1 "52:54:00:d9:02:00"
#define MAC_VETH1 "52:54:00:d9:03:00"

#define VXLAN_TUNL_DEV0 "vxlan00"
#define VXLAN_TUNL_DEV1 "vxlan11"
#define IP6VXLAN_TUNL_DEV0 "ip6vxlan00"
#define IP6VXLAN_TUNL_DEV1 "ip6vxlan11"

#define IPIP_TUNL_DEV0 "ipip00"
#define IPIP_TUNL_DEV1 "ipip11"

#define XFRM_AUTH "0x1111111111111111111111111111111111111111"
#define XFRM_ENC "0x22222222222222222222222222222222"
#define XFRM_SPI_IN_TO_OUT 0x1
#define XFRM_SPI_OUT_TO_IN 0x2

#define GRE_TUNL_DEV0 "gre00"
#define GRE_TUNL_DEV1 "gre11"

#define IP6GRE_TUNL_DEV0 "ip6gre00"
#define IP6GRE_TUNL_DEV1 "ip6gre11"

#define ERSPAN_TUNL_DEV0 "erspan00"
#define ERSPAN_TUNL_DEV1 "erspan11"

#define IP6ERSPAN_TUNL_DEV0 "ip6erspan00"
#define IP6ERSPAN_TUNL_DEV1 "ip6erspan11"

#define GENEVE_TUNL_DEV0 "geneve00"
#define GENEVE_TUNL_DEV1 "geneve11"

#define IP6GENEVE_TUNL_DEV0 "ip6geneve00"
#define IP6GENEVE_TUNL_DEV1 "ip6geneve11"

#define IP6TNL_TUNL_DEV0 "ip6tnl00"
#define IP6TNL_TUNL_DEV1 "ip6tnl11"

#define PING_ARGS "-i 0.01 -c 3 -w 10 -q"

static int config_device(void)
{
	SYS(fail, "ip netns add at_ns0");
	SYS(fail, "ip link add veth0 address " MAC_VETH1 " type veth peer name veth1");
	SYS(fail, "ip link set veth0 netns at_ns0");
	SYS(fail, "ip addr add " IP4_ADDR1_VETH1 "/24 dev veth1");
	SYS(fail, "ip link set dev veth1 up mtu 1500");
	SYS(fail, "ip netns exec at_ns0 ip addr add " IP4_ADDR_VETH0 "/24 dev veth0");
	SYS(fail, "ip netns exec at_ns0 ip link set dev veth0 up mtu 1500");

	return 0;
fail:
	return -1;
}

static void cleanup(void)
{
	SYS_NOFAIL("test -f /var/run/netns/at_ns0 && ip netns delete at_ns0");
	SYS_NOFAIL("ip link del veth1");
	SYS_NOFAIL("ip link del %s", VXLAN_TUNL_DEV1);
	SYS_NOFAIL("ip link del %s", IP6VXLAN_TUNL_DEV1);
}

static int add_vxlan_tunnel(void)
{
	/* at_ns0 namespace */
	SYS(fail, "ip netns exec at_ns0 ip link add dev %s type vxlan external gbp dstport 4789",
	    VXLAN_TUNL_DEV0);
	SYS(fail, "ip netns exec at_ns0 ip link set dev %s address %s up",
	    VXLAN_TUNL_DEV0, MAC_TUNL_DEV0);
	SYS(fail, "ip netns exec at_ns0 ip addr add dev %s %s/24",
	    VXLAN_TUNL_DEV0, IP4_ADDR_TUNL_DEV0);
	SYS(fail, "ip netns exec at_ns0 ip neigh add %s lladdr %s dev %s",
	    IP4_ADDR_TUNL_DEV1, MAC_TUNL_DEV1, VXLAN_TUNL_DEV0);
	SYS(fail, "ip netns exec at_ns0 ip neigh add %s lladdr %s dev veth0",
	    IP4_ADDR2_VETH1, MAC_VETH1);

	/* root namespace */
	SYS(fail, "ip link add dev %s type vxlan external gbp dstport 4789",
	    VXLAN_TUNL_DEV1);
	SYS(fail, "ip link set dev %s address %s up", VXLAN_TUNL_DEV1, MAC_TUNL_DEV1);
	SYS(fail, "ip addr add dev %s %s/24", VXLAN_TUNL_DEV1, IP4_ADDR_TUNL_DEV1);
	SYS(fail, "ip neigh add %s lladdr %s dev %s",
	    IP4_ADDR_TUNL_DEV0, MAC_TUNL_DEV0, VXLAN_TUNL_DEV1);

	return 0;
fail:
	return -1;
}

static void delete_vxlan_tunnel(void)
{
	SYS_NOFAIL("ip netns exec at_ns0 ip link delete dev %s",
		   VXLAN_TUNL_DEV0);
	SYS_NOFAIL("ip link delete dev %s", VXLAN_TUNL_DEV1);
}

static int add_ip6vxlan_tunnel(void)
{
	SYS(fail, "ip netns exec at_ns0 ip -6 addr add %s/96 dev veth0",
	    IP6_ADDR_VETH0);
	SYS(fail, "ip netns exec at_ns0 ip link set dev veth0 up");
	SYS(fail, "ip -6 addr add %s/96 dev veth1", IP6_ADDR1_VETH1);
	SYS(fail, "ip -6 addr add %s/96 dev veth1", IP6_ADDR2_VETH1);
	SYS(fail, "ip link set dev veth1 up");

	/* at_ns0 namespace */
	SYS(fail, "ip netns exec at_ns0 ip link add dev %s type vxlan external dstport 4789",
	    IP6VXLAN_TUNL_DEV0);
	SYS(fail, "ip netns exec at_ns0 ip addr add dev %s %s/24",
	    IP6VXLAN_TUNL_DEV0, IP4_ADDR_TUNL_DEV0);
	SYS(fail, "ip netns exec at_ns0 ip link set dev %s address %s up",
	    IP6VXLAN_TUNL_DEV0, MAC_TUNL_DEV0);

	/* root namespace */
	SYS(fail, "ip link add dev %s type vxlan external dstport 4789",
	    IP6VXLAN_TUNL_DEV1);
	SYS(fail, "ip addr add dev %s %s/24", IP6VXLAN_TUNL_DEV1, IP4_ADDR_TUNL_DEV1);
	SYS(fail, "ip link set dev %s address %s up",
	    IP6VXLAN_TUNL_DEV1, MAC_TUNL_DEV1);

	return 0;
fail:
	return -1;
}

static void delete_ip6vxlan_tunnel(void)
{
	SYS_NOFAIL("ip netns exec at_ns0 ip -6 addr delete %s/96 dev veth0",
		   IP6_ADDR_VETH0);
	SYS_NOFAIL("ip -6 addr delete %s/96 dev veth1", IP6_ADDR1_VETH1);
	SYS_NOFAIL("ip -6 addr delete %s/96 dev veth1", IP6_ADDR2_VETH1);
	SYS_NOFAIL("ip netns exec at_ns0 ip link delete dev %s",
		   IP6VXLAN_TUNL_DEV0);
	SYS_NOFAIL("ip link delete dev %s", IP6VXLAN_TUNL_DEV1);
}

enum ipip_encap {
	NONE	= 0,
	FOU	= 1,
	GUE	= 2,
};

static int set_ipip_encap(const char *ipproto, const char *type)
{
	SYS(fail, "ip -n at_ns0 fou add port 5555 %s", ipproto);
	SYS(fail, "ip -n at_ns0 link set dev %s type ipip encap %s",
	    IPIP_TUNL_DEV0, type);
	SYS(fail, "ip -n at_ns0 link set dev %s type ipip encap-dport 5555",
	    IPIP_TUNL_DEV0);

	return 0;
fail:
	return -1;
}

static int set_ipv4_addr(const char *dev0, const char *dev1)
{
	SYS(fail, "ip -n at_ns0 link set dev %s up", dev0);
	SYS(fail, "ip -n at_ns0 addr add dev %s %s/24", dev0, IP4_ADDR_TUNL_DEV0);
	SYS(fail, "ip link set dev %s up", dev1);
	SYS(fail, "ip addr add dev %s %s/24", dev1, IP4_ADDR_TUNL_DEV1);

	return 0;
fail:
	return 1;
}

static int add_ipip_tunnel(enum ipip_encap encap)
{
	int err;
	const char *ipproto, *type;

	switch (encap) {
	case FOU:
		ipproto = "ipproto 4";
		type = "fou";
		break;
	case GUE:
		ipproto = "gue";
		type = ipproto;
		break;
	default:
		ipproto = NULL;
		type = ipproto;
	}

	/* at_ns0 namespace */
	SYS(fail, "ip -n at_ns0 link add dev %s type ipip local %s remote %s",
	    IPIP_TUNL_DEV0, IP4_ADDR_VETH0, IP4_ADDR1_VETH1);

	if (type && ipproto) {
		err = set_ipip_encap(ipproto, type);
		if (!ASSERT_OK(err, "set_ipip_encap"))
			goto fail;
	}

	SYS(fail, "ip -n at_ns0 link set dev %s up", IPIP_TUNL_DEV0);
	SYS(fail, "ip -n at_ns0 addr add dev %s %s/24",
	    IPIP_TUNL_DEV0, IP4_ADDR_TUNL_DEV0);

	/* root namespace */
	if (type && ipproto)
		SYS(fail, "ip fou add port 5555 %s", ipproto);
	SYS(fail, "ip link add dev %s type ipip external", IPIP_TUNL_DEV1);
	SYS(fail, "ip link set dev %s up", IPIP_TUNL_DEV1);
	SYS(fail, "ip addr add dev %s %s/24", IPIP_TUNL_DEV1,
	    IP4_ADDR_TUNL_DEV1);

	return 0;
fail:
	return -1;
}

static void delete_ipip_tunnel(void)
{
	SYS_NOFAIL("ip -n at_ns0 link delete dev %s", IPIP_TUNL_DEV0);
	SYS_NOFAIL("ip -n at_ns0 fou del port 5555");
	SYS_NOFAIL("ip link delete dev %s", IPIP_TUNL_DEV1);
	SYS_NOFAIL("ip fou del port 5555");
}

static int add_xfrm_tunnel(void)
{
	/* at_ns0 namespace
	 * at_ns0 -> root
	 */
	SYS(fail,
	    "ip netns exec at_ns0 "
		"ip xfrm state add src %s dst %s proto esp "
			"spi %d reqid 1 mode tunnel replay-window 42 "
			"auth-trunc 'hmac(sha1)' %s 96 enc 'cbc(aes)' %s",
	    IP4_ADDR_VETH0, IP4_ADDR1_VETH1, XFRM_SPI_IN_TO_OUT, XFRM_AUTH, XFRM_ENC);
	SYS(fail,
	    "ip netns exec at_ns0 "
		"ip xfrm policy add src %s/32 dst %s/32 dir out "
			"tmpl src %s dst %s proto esp reqid 1 "
			"mode tunnel",
	    IP4_ADDR_TUNL_DEV0, IP4_ADDR_TUNL_DEV1, IP4_ADDR_VETH0, IP4_ADDR1_VETH1);

	/* root -> at_ns0 */
	SYS(fail,
	    "ip netns exec at_ns0 "
		"ip xfrm state add src %s dst %s proto esp "
			"spi %d reqid 2 mode tunnel "
			"auth-trunc 'hmac(sha1)' %s 96 enc 'cbc(aes)' %s",
	    IP4_ADDR1_VETH1, IP4_ADDR_VETH0, XFRM_SPI_OUT_TO_IN, XFRM_AUTH, XFRM_ENC);
	SYS(fail,
	    "ip netns exec at_ns0 "
		"ip xfrm policy add src %s/32 dst %s/32 dir in "
			"tmpl src %s dst %s proto esp reqid 2 "
			"mode tunnel",
	    IP4_ADDR_TUNL_DEV1, IP4_ADDR_TUNL_DEV0, IP4_ADDR1_VETH1, IP4_ADDR_VETH0);

	/* address & route */
	SYS(fail, "ip netns exec at_ns0 ip addr add dev veth0 %s/32",
	    IP4_ADDR_TUNL_DEV0);
	SYS(fail, "ip netns exec at_ns0 ip route add %s dev veth0 via %s src %s",
	    IP4_ADDR_TUNL_DEV1, IP4_ADDR1_VETH1, IP4_ADDR_TUNL_DEV0);

	/* root namespace
	 * at_ns0 -> root
	 */
	SYS(fail,
	    "ip xfrm state add src %s dst %s proto esp "
		    "spi %d reqid 1 mode tunnel replay-window 42 "
		    "auth-trunc 'hmac(sha1)' %s 96  enc 'cbc(aes)' %s",
	    IP4_ADDR_VETH0, IP4_ADDR1_VETH1, XFRM_SPI_IN_TO_OUT, XFRM_AUTH, XFRM_ENC);
	SYS(fail,
	    "ip xfrm policy add src %s/32 dst %s/32 dir in "
		    "tmpl src %s dst %s proto esp reqid 1 "
		    "mode tunnel",
	    IP4_ADDR_TUNL_DEV0, IP4_ADDR_TUNL_DEV1, IP4_ADDR_VETH0, IP4_ADDR1_VETH1);

	/* root -> at_ns0 */
	SYS(fail,
	    "ip xfrm state add src %s dst %s proto esp "
		    "spi %d reqid 2 mode tunnel "
		    "auth-trunc 'hmac(sha1)' %s 96  enc 'cbc(aes)' %s",
	    IP4_ADDR1_VETH1, IP4_ADDR_VETH0, XFRM_SPI_OUT_TO_IN, XFRM_AUTH, XFRM_ENC);
	SYS(fail,
	    "ip xfrm policy add src %s/32 dst %s/32 dir out "
		    "tmpl src %s dst %s proto esp reqid 2 "
		    "mode tunnel",
	    IP4_ADDR_TUNL_DEV1, IP4_ADDR_TUNL_DEV0, IP4_ADDR1_VETH1, IP4_ADDR_VETH0);

	/* address & route */
	SYS(fail, "ip addr add dev veth1 %s/32", IP4_ADDR_TUNL_DEV1);
	SYS(fail, "ip route add %s dev veth1 via %s src %s",
	    IP4_ADDR_TUNL_DEV0, IP4_ADDR_VETH0, IP4_ADDR_TUNL_DEV1);

	return 0;
fail:
	return -1;
}

static void delete_xfrm_tunnel(void)
{
	SYS_NOFAIL("ip xfrm policy delete dir out src %s/32 dst %s/32",
		   IP4_ADDR_TUNL_DEV1, IP4_ADDR_TUNL_DEV0);
	SYS_NOFAIL("ip xfrm policy delete dir in src %s/32 dst %s/32",
		   IP4_ADDR_TUNL_DEV0, IP4_ADDR_TUNL_DEV1);
	SYS_NOFAIL("ip xfrm state delete src %s dst %s proto esp spi %d",
		   IP4_ADDR_VETH0, IP4_ADDR1_VETH1, XFRM_SPI_IN_TO_OUT);
	SYS_NOFAIL("ip xfrm state delete src %s dst %s proto esp spi %d",
		   IP4_ADDR1_VETH1, IP4_ADDR_VETH0, XFRM_SPI_OUT_TO_IN);
}

static int add_ipv4_tunnel(const char *dev0, const char *dev1,
			   const char *type, const char *opt)
{
	if (!type || !opt || !dev0 || !dev1)
		return -1;

	SYS(fail, "ip -n at_ns0 link add dev %s type %s %s local %s remote %s",
	    dev0, type, opt, IP4_ADDR_VETH0, IP4_ADDR1_VETH1);

	SYS(fail, "ip link add dev %s type %s external", dev1, type);

	return set_ipv4_addr(dev0, dev1);
fail:
	return -1;
}

static void delete_tunnel(const char *dev0, const char *dev1)
{
	if (!dev0 || !dev1)
		return;

	SYS_NOFAIL("ip netns exec at_ns0 ip link delete dev %s", dev0);
	SYS_NOFAIL("ip link delete dev %s", dev1);
}

static int set_ipv6_addr(const char *dev0, const char *dev1)
{
	/* disable IPv6 DAD because it might take too long and fail tests */
	SYS(fail, "ip -n at_ns0 addr add %s/96 dev veth0 nodad", IP6_ADDR_VETH0);
	SYS(fail, "ip -n at_ns0 link set dev veth0 up");
	SYS(fail, "ip addr add %s/96 dev veth1 nodad", IP6_ADDR1_VETH1);
	SYS(fail, "ip link set dev veth1 up");

	SYS(fail, "ip -n at_ns0 addr add dev %s %s/24", dev0, IP4_ADDR_TUNL_DEV0);
	SYS(fail, "ip -n at_ns0 addr add dev %s %s/96 nodad", dev0, IP6_ADDR_TUNL_DEV0);
	SYS(fail, "ip -n at_ns0 link set dev %s up", dev0);

	SYS(fail, "ip addr add dev %s %s/24", dev1, IP4_ADDR_TUNL_DEV1);
	SYS(fail, "ip addr add dev %s %s/96 nodad", dev1, IP6_ADDR_TUNL_DEV1);
	SYS(fail, "ip link set dev %s up", dev1);
	return 0;
fail:
	return 1;
}

static int add_ipv6_tunnel(const char *dev0, const char *dev1,
			   const char *type, const char *opt)
{
	if (!type || !opt || !dev0 || !dev1)
		return -1;

	SYS(fail, "ip -n at_ns0 link add dev %s type %s %s local %s remote %s",
	    dev0, type, opt, IP6_ADDR_VETH0, IP6_ADDR1_VETH1);

	SYS(fail, "ip link add dev %s type %s external", dev1, type);

	return set_ipv6_addr(dev0, dev1);
fail:
	return -1;
}

static int add_geneve_tunnel(const char *dev0, const char *dev1,
			     const char *type, const char *opt)
{
	if (!type || !opt || !dev0 || !dev1)
		return -1;

	SYS(fail, "ip -n at_ns0 link add dev %s type %s id 2 %s remote %s",
	    dev0, type, opt, IP4_ADDR1_VETH1);

	SYS(fail, "ip link add dev %s type %s %s external", dev1, type, opt);

	return set_ipv4_addr(dev0, dev1);
fail:
	return -1;
}

static int add_ip6geneve_tunnel(const char *dev0, const char *dev1,
			     const char *type, const char *opt)
{
	if (!type || !opt || !dev0 || !dev1)
		return -1;

	SYS(fail, "ip -n at_ns0 link add dev %s type %s id 22 %s remote %s",
	    dev0, type, opt, IP6_ADDR1_VETH1);

	SYS(fail, "ip link add dev %s type %s %s external", dev1, type, opt);

	return set_ipv6_addr(dev0, dev1);
fail:
	return -1;
}

static int test_ping(int family, const char *addr)
{
	SYS(fail, "%s %s %s > /dev/null", ping_command(family), PING_ARGS, addr);
	return 0;
fail:
	return -1;
}

static void ping_dev0(void)
{
	/* ping from root namespace test */
	test_ping(AF_INET, IP4_ADDR_TUNL_DEV0);
}

static void ping_dev1(void)
{
	struct nstoken *nstoken;

	/* ping from at_ns0 namespace test */
	nstoken = open_netns("at_ns0");
	if (!ASSERT_OK_PTR(nstoken, "setns"))
		return;

	test_ping(AF_INET, IP4_ADDR_TUNL_DEV1);
	close_netns(nstoken);
}

static void ping6_veth0(void)
{
	test_ping(AF_INET6, IP6_ADDR_VETH0);
}

static void ping6_dev0(void)
{
	test_ping(AF_INET6, IP6_ADDR_TUNL_DEV0);
}

static void ping6_dev1(void)
{
	struct nstoken *nstoken;

	/* ping from at_ns0 namespace test */
	nstoken = open_netns("at_ns0");
	if (!ASSERT_OK_PTR(nstoken, "setns"))
		return;

	test_ping(AF_INET, IP6_ADDR_TUNL_DEV1);
	close_netns(nstoken);
}

static void test_vxlan_tunnel(void)
{
	struct test_tunnel_kern *skel = NULL;
	struct nstoken *nstoken;
	int local_ip_map_fd = -1;
	int set_src_prog_fd, get_src_prog_fd;
	int set_dst_prog_fd;
	int key = 0;
	uint local_ip;
	int err;

	/* add vxlan tunnel */
	err = add_vxlan_tunnel();
	if (!ASSERT_OK(err, "add vxlan tunnel"))
		goto done;

	/* load and attach bpf prog to tunnel dev tc hook point */
	skel = test_tunnel_kern__open_and_load();
	if (!ASSERT_OK_PTR(skel, "test_tunnel_kern__open_and_load"))
		goto done;
	get_src_prog_fd = bpf_program__fd(skel->progs.vxlan_get_tunnel_src);
	set_src_prog_fd = bpf_program__fd(skel->progs.vxlan_set_tunnel_src);
	if (tc_prog_attach(VXLAN_TUNL_DEV1, get_src_prog_fd, set_src_prog_fd))
		goto done;

	/* load and attach bpf prog to veth dev tc hook point */
	set_dst_prog_fd = bpf_program__fd(skel->progs.veth_set_outer_dst);
	if (tc_prog_attach("veth1", set_dst_prog_fd, -1))
		goto done;

	/* load and attach prog set_md to tunnel dev tc hook point at_ns0 */
	nstoken = open_netns("at_ns0");
	if (!ASSERT_OK_PTR(nstoken, "setns src"))
		goto done;
	set_dst_prog_fd = bpf_program__fd(skel->progs.vxlan_set_tunnel_dst);
	if (tc_prog_attach(VXLAN_TUNL_DEV0, -1, set_dst_prog_fd))
		goto done;
	close_netns(nstoken);

	/* use veth1 ip 2 as tunnel source ip */
	local_ip_map_fd = bpf_map__fd(skel->maps.local_ip_map);
	if (!ASSERT_GE(local_ip_map_fd, 0, "bpf_map__fd"))
		goto done;
	local_ip = IP4_ADDR2_HEX_VETH1;
	err = bpf_map_update_elem(local_ip_map_fd, &key, &local_ip, BPF_ANY);
	if (!ASSERT_OK(err, "update bpf local_ip_map"))
		goto done;

	/* ping test */
	ping_dev0();

done:
	/* delete vxlan tunnel */
	delete_vxlan_tunnel();
	if (local_ip_map_fd >= 0)
		close(local_ip_map_fd);
	if (skel)
		test_tunnel_kern__destroy(skel);
}

static void test_ip6vxlan_tunnel(void)
{
	struct test_tunnel_kern *skel = NULL;
	struct nstoken *nstoken;
	int local_ip_map_fd = -1;
	int set_src_prog_fd, get_src_prog_fd;
	int set_dst_prog_fd;
	int key = 0;
	uint local_ip;
	int err;

	/* add vxlan tunnel */
	err = add_ip6vxlan_tunnel();
	if (!ASSERT_OK(err, "add_ip6vxlan_tunnel"))
		goto done;

	/* load and attach bpf prog to tunnel dev tc hook point */
	skel = test_tunnel_kern__open_and_load();
	if (!ASSERT_OK_PTR(skel, "test_tunnel_kern__open_and_load"))
		goto done;
	get_src_prog_fd = bpf_program__fd(skel->progs.ip6vxlan_get_tunnel_src);
	set_src_prog_fd = bpf_program__fd(skel->progs.ip6vxlan_set_tunnel_src);
	if (tc_prog_attach(IP6VXLAN_TUNL_DEV1, get_src_prog_fd, set_src_prog_fd))
		goto done;

	/* load and attach prog set_md to tunnel dev tc hook point at_ns0 */
	nstoken = open_netns("at_ns0");
	if (!ASSERT_OK_PTR(nstoken, "setns src"))
		goto done;
	set_dst_prog_fd = bpf_program__fd(skel->progs.ip6vxlan_set_tunnel_dst);
	if (tc_prog_attach(IP6VXLAN_TUNL_DEV0, -1, set_dst_prog_fd))
		goto done;
	close_netns(nstoken);

	/* use veth1 ip 2 as tunnel source ip */
	local_ip_map_fd = bpf_map__fd(skel->maps.local_ip_map);
	if (!ASSERT_GE(local_ip_map_fd, 0, "get local_ip_map fd"))
		goto done;
	local_ip = IP6_ADDR2_HEX_VETH1;
	err = bpf_map_update_elem(local_ip_map_fd, &key, &local_ip, BPF_ANY);
	if (!ASSERT_OK(err, "update bpf local_ip_map"))
		goto done;

	/* ping test */
	ping_dev0();

done:
	/* delete ipv6 vxlan tunnel */
	delete_ip6vxlan_tunnel();
	if (local_ip_map_fd >= 0)
		close(local_ip_map_fd);
	if (skel)
		test_tunnel_kern__destroy(skel);
}

static void test_ipip_tunnel(enum ipip_encap encap)
{
	struct test_tunnel_kern *skel = NULL;
	int set_src_prog_fd, get_src_prog_fd;
	int err;

	/* add ipip tunnel */
	err = add_ipip_tunnel(encap);
	if (!ASSERT_OK(err, "add_ipip_tunnel"))
		goto done;

	/* load and attach bpf prog to tunnel dev tc hook point */
	skel = test_tunnel_kern__open_and_load();
	if (!ASSERT_OK_PTR(skel, "test_tunnel_kern__open_and_load"))
		goto done;

	switch (encap) {
	case FOU:
		get_src_prog_fd = bpf_program__fd(
			skel->progs.ipip_encap_get_tunnel);
		set_src_prog_fd = bpf_program__fd(
			skel->progs.ipip_fou_set_tunnel);
		break;
	case GUE:
		get_src_prog_fd = bpf_program__fd(
			skel->progs.ipip_encap_get_tunnel);
		set_src_prog_fd = bpf_program__fd(
			skel->progs.ipip_gue_set_tunnel);
		break;
	default:
		get_src_prog_fd = bpf_program__fd(
			skel->progs.ipip_get_tunnel);
		set_src_prog_fd = bpf_program__fd(
			skel->progs.ipip_set_tunnel);
	}

	if (tc_prog_attach(IPIP_TUNL_DEV1, get_src_prog_fd, set_src_prog_fd))
		goto done;

	ping_dev0();
	ping_dev1();

done:
	/* delete ipip tunnel */
	delete_ipip_tunnel();
	if (skel)
		test_tunnel_kern__destroy(skel);
}

static void test_xfrm_tunnel(void)
{
	LIBBPF_OPTS(bpf_xdp_attach_opts, opts);
	struct test_tunnel_kern *skel = NULL;
	int xdp_prog_fd;
	int tc_prog_fd;
	int ifindex;
	int err;

	err = add_xfrm_tunnel();
	if (!ASSERT_OK(err, "add_xfrm_tunnel"))
		return;

	skel = test_tunnel_kern__open_and_load();
	if (!ASSERT_OK_PTR(skel, "test_tunnel_kern__open_and_load"))
		goto done;


	/* attach tc prog to tunnel dev */
	tc_prog_fd = bpf_program__fd(skel->progs.xfrm_get_state);
	if (tc_prog_attach("veth1", tc_prog_fd, -1))
		goto done;

	/* attach xdp prog to tunnel dev */
	ifindex = if_nametoindex("veth1");
	if (!ASSERT_NEQ(ifindex, 0, "veth1 ifindex"))
		goto done;
	xdp_prog_fd = bpf_program__fd(skel->progs.xfrm_get_state_xdp);
	if (!ASSERT_GE(xdp_prog_fd, 0, "bpf_program__fd"))
		goto done;
	err = bpf_xdp_attach(ifindex, xdp_prog_fd, XDP_FLAGS_REPLACE, &opts);
	if (!ASSERT_OK(err, "bpf_xdp_attach"))
		goto done;

	ping_dev1();

	if (!ASSERT_EQ(skel->bss->xfrm_reqid, 1, "req_id"))
		goto done;
	if (!ASSERT_EQ(skel->bss->xfrm_spi, XFRM_SPI_IN_TO_OUT, "spi"))
		goto done;
	if (!ASSERT_EQ(skel->bss->xfrm_remote_ip, 0xac100164, "remote_ip"))
		goto done;
	if (!ASSERT_EQ(skel->bss->xfrm_replay_window, 42, "replay_window"))
		goto done;

done:
	delete_xfrm_tunnel();
	if (skel)
		test_tunnel_kern__destroy(skel);
}

enum gre_test {
	GRE,
	GRE_NOKEY,
	GRETAP,
	GRETAP_NOKEY,
};

static void test_gre_tunnel(enum gre_test test)
{
	struct test_tunnel_kern *skel;
	int set_fd, get_fd;
	int err;

	skel = test_tunnel_kern__open_and_load();
	if (!ASSERT_OK_PTR(skel, "test_tunnel_kern__open_and_load"))
		return;

	switch (test) {
	case GRE:
		err = add_ipv4_tunnel(GRE_TUNL_DEV0, GRE_TUNL_DEV1, "gre", "seq");
		set_fd = bpf_program__fd(skel->progs.gre_set_tunnel_no_key);
		get_fd = bpf_program__fd(skel->progs.gre_get_tunnel);
		break;
	case GRE_NOKEY:
		err = add_ipv4_tunnel(GRE_TUNL_DEV0, GRE_TUNL_DEV1, "gre", "seq key 2");
		set_fd = bpf_program__fd(skel->progs.gre_set_tunnel);
		get_fd = bpf_program__fd(skel->progs.gre_get_tunnel);
		break;
	case GRETAP:
		err = add_ipv4_tunnel(GRE_TUNL_DEV0, GRE_TUNL_DEV1, "gretap", "seq");
		set_fd = bpf_program__fd(skel->progs.gre_set_tunnel_no_key);
		get_fd = bpf_program__fd(skel->progs.gre_get_tunnel);
		break;
	case GRETAP_NOKEY:
		err = add_ipv4_tunnel(GRE_TUNL_DEV0, GRE_TUNL_DEV1, "gretap", "seq key 2");
		set_fd = bpf_program__fd(skel->progs.gre_set_tunnel);
		get_fd = bpf_program__fd(skel->progs.gre_get_tunnel);
		break;
	}
	if (!ASSERT_OK(err, "add tunnel"))
		goto done;

	if (tc_prog_attach(GRE_TUNL_DEV1, get_fd, set_fd))
		goto done;

	ping_dev0();
	ping_dev1();

done:
	delete_tunnel(GRE_TUNL_DEV0, GRE_TUNL_DEV1);
	test_tunnel_kern__destroy(skel);
}

enum ip6gre_test {
	IP6GRE,
	IP6GRETAP
};

static void test_ip6gre_tunnel(enum ip6gre_test test)
{
	struct test_tunnel_kern *skel;
	int set_fd, get_fd;
	int err;

	skel = test_tunnel_kern__open_and_load();
	if (!ASSERT_OK_PTR(skel, "test_tunnel_kern__open_and_load"))
		return;

	switch (test) {
	case IP6GRE:
		err = add_ipv6_tunnel(IP6GRE_TUNL_DEV0, IP6GRE_TUNL_DEV1,
				      "ip6gre", "flowlabel 0xbcdef key 2");
		break;
	case IP6GRETAP:
		err = add_ipv6_tunnel(IP6GRE_TUNL_DEV0, IP6GRE_TUNL_DEV1,
				      "ip6gretap", "flowlabel 0xbcdef key 2");
		break;
	}
	if (!ASSERT_OK(err, "add tunnel"))
		goto done;

	set_fd = bpf_program__fd(skel->progs.ip6gretap_set_tunnel);
	get_fd = bpf_program__fd(skel->progs.ip6gretap_get_tunnel);
	if (tc_prog_attach(IP6GRE_TUNL_DEV1, get_fd, set_fd))
		goto done;

	ping6_veth0();
	ping6_dev1();
	ping_dev0();
	ping_dev1();
done:
	delete_tunnel(IP6GRE_TUNL_DEV0, IP6GRE_TUNL_DEV1);
	test_tunnel_kern__destroy(skel);
}

enum erspan_test {
	V1,
	V2
};

static void test_erspan_tunnel(enum erspan_test test)
{
	struct test_tunnel_kern *skel;
	int set_fd, get_fd;
	int err;

	skel = test_tunnel_kern__open_and_load();
	if (!ASSERT_OK_PTR(skel, "test_tunnel_kern__open_and_load"))
		return;

	switch (test) {
	case V1:
		err = add_ipv4_tunnel(ERSPAN_TUNL_DEV0, ERSPAN_TUNL_DEV1,
				      "erspan", "seq key 2 erspan_ver 1 erspan 123");
		break;
	case V2:
		err = add_ipv4_tunnel(ERSPAN_TUNL_DEV0, ERSPAN_TUNL_DEV1,
				      "erspan",
				      "seq key 2 erspan_ver 2 erspan_dir egress erspan_hwid 3");
		break;
	}
	if (!ASSERT_OK(err, "add tunnel"))
		goto done;

	set_fd = bpf_program__fd(skel->progs.erspan_set_tunnel);
	get_fd = bpf_program__fd(skel->progs.erspan_get_tunnel);
	if (tc_prog_attach(ERSPAN_TUNL_DEV1, get_fd, set_fd))
		goto done;

	ping_dev0();
	ping_dev1();
done:
	delete_tunnel(ERSPAN_TUNL_DEV0, ERSPAN_TUNL_DEV1);
	test_tunnel_kern__destroy(skel);
}

static void test_ip6erspan_tunnel(enum erspan_test test)
{
	struct test_tunnel_kern *skel;
	int set_fd, get_fd;
	int err;

	skel = test_tunnel_kern__open_and_load();
	if (!ASSERT_OK_PTR(skel, "test_tunnel_kern__open_and_load"))
		return;

	switch (test) {
	case V1:
		err = add_ipv6_tunnel(IP6ERSPAN_TUNL_DEV0, IP6ERSPAN_TUNL_DEV1,
				      "ip6erspan", "seq key 2 erspan_ver 1 erspan 123");
		break;
	case V2:
		err = add_ipv6_tunnel(IP6ERSPAN_TUNL_DEV0, IP6ERSPAN_TUNL_DEV1,
				      "ip6erspan",
				      "seq key 2 erspan_ver 2 erspan_dir egress erspan_hwid 7");
		break;
	}
	if (!ASSERT_OK(err, "add tunnel"))
		goto done;

	set_fd = bpf_program__fd(skel->progs.ip4ip6erspan_set_tunnel);
	get_fd = bpf_program__fd(skel->progs.ip4ip6erspan_get_tunnel);
	if (tc_prog_attach(IP6ERSPAN_TUNL_DEV1, get_fd, set_fd))
		goto done;

	ping6_veth0();
	ping_dev1();
done:
	delete_tunnel(IP6ERSPAN_TUNL_DEV0, IP6ERSPAN_TUNL_DEV1);
	test_tunnel_kern__destroy(skel);
}

static void test_geneve_tunnel(void)
{
	struct test_tunnel_kern *skel;
	int set_fd, get_fd;
	int err;

	skel = test_tunnel_kern__open_and_load();
	if (!ASSERT_OK_PTR(skel, "test_tunnel_kern__open_and_load"))
		return;

	err = add_geneve_tunnel(GENEVE_TUNL_DEV0, GENEVE_TUNL_DEV1,
				"geneve", "dstport 6081");
	if (!ASSERT_OK(err, "add tunnel"))
		goto done;

	set_fd = bpf_program__fd(skel->progs.geneve_set_tunnel);
	get_fd = bpf_program__fd(skel->progs.geneve_get_tunnel);
	if (tc_prog_attach(GENEVE_TUNL_DEV1, get_fd, set_fd))
		goto done;

	ping_dev0();
	ping_dev1();
done:
	delete_tunnel(GENEVE_TUNL_DEV0, GENEVE_TUNL_DEV1);
	test_tunnel_kern__destroy(skel);
}

static void test_ip6geneve_tunnel(void)
{
	struct test_tunnel_kern *skel;
	int set_fd, get_fd;
	int err;

	skel = test_tunnel_kern__open_and_load();
	if (!ASSERT_OK_PTR(skel, "test_tunnel_kern__open_and_load"))
		return;

	err = add_ip6geneve_tunnel(IP6GENEVE_TUNL_DEV0, IP6GENEVE_TUNL_DEV1,
				   "geneve", "");
	if (!ASSERT_OK(err, "add tunnel"))
		goto done;

	set_fd = bpf_program__fd(skel->progs.ip6geneve_set_tunnel);
	get_fd = bpf_program__fd(skel->progs.ip6geneve_get_tunnel);
	if (tc_prog_attach(IP6GENEVE_TUNL_DEV1, get_fd, set_fd))
		goto done;

	ping_dev0();
	ping_dev1();
done:
	delete_tunnel(IP6GENEVE_TUNL_DEV0, IP6GENEVE_TUNL_DEV1);
	test_tunnel_kern__destroy(skel);
}

enum ip6tnl_test {
	IPIP6,
	IP6IP6
};

static void test_ip6tnl_tunnel(enum ip6tnl_test test)
{
	struct test_tunnel_kern *skel;
	int set_fd, get_fd;
	int err;

	skel = test_tunnel_kern__open_and_load();
	if (!ASSERT_OK_PTR(skel, "test_tunnel_kern__open_and_load"))
		return;

	err = add_ipv6_tunnel(IP6TNL_TUNL_DEV0, IP6TNL_TUNL_DEV1, "ip6tnl", "");
	if (!ASSERT_OK(err, "add tunnel"))
		goto done;

	switch (test) {
	case IPIP6:
		set_fd = bpf_program__fd(skel->progs.ipip6_set_tunnel);
		get_fd = bpf_program__fd(skel->progs.ipip6_get_tunnel);
		break;
	case IP6IP6:
		set_fd = bpf_program__fd(skel->progs.ip6ip6_set_tunnel);
		get_fd = bpf_program__fd(skel->progs.ip6ip6_get_tunnel);
		break;
	}
	if (tc_prog_attach(IP6TNL_TUNL_DEV1, get_fd, set_fd))
		goto done;

	ping6_veth0();
	switch (test) {
	case IPIP6:
		ping_dev0();
		ping_dev1();
		break;
	case IP6IP6:
		ping6_dev0();
		ping6_dev1();
		break;
	}

done:
	delete_tunnel(IP6TNL_TUNL_DEV0, IP6TNL_TUNL_DEV1);
	test_tunnel_kern__destroy(skel);
}

#define RUN_TEST(name, ...)						\
	({								\
		if (test__start_subtest(#name)) {			\
			config_device();				\
			test_ ## name(__VA_ARGS__);			\
			cleanup();					\
		}							\
	})

static void *test_tunnel_run_tests(void *arg)
{
	RUN_TEST(vxlan_tunnel);
	RUN_TEST(ip6vxlan_tunnel);
	RUN_TEST(ipip_tunnel, NONE);
	RUN_TEST(ipip_tunnel, FOU);
	RUN_TEST(ipip_tunnel, GUE);
	RUN_TEST(xfrm_tunnel);
	RUN_TEST(gre_tunnel, GRE);
	RUN_TEST(gre_tunnel, GRE_NOKEY);
	RUN_TEST(gre_tunnel, GRETAP);
	RUN_TEST(gre_tunnel, GRETAP_NOKEY);
	RUN_TEST(ip6gre_tunnel, IP6GRE);
	RUN_TEST(ip6gre_tunnel, IP6GRETAP);
	RUN_TEST(erspan_tunnel, V1);
	RUN_TEST(erspan_tunnel, V2);
	RUN_TEST(ip6erspan_tunnel, V1);
	RUN_TEST(ip6erspan_tunnel, V2);
	RUN_TEST(geneve_tunnel);
	RUN_TEST(ip6geneve_tunnel);
	RUN_TEST(ip6tnl_tunnel, IPIP6);
	RUN_TEST(ip6tnl_tunnel, IP6IP6);

	return NULL;
}

void test_tunnel(void)
{
	pthread_t test_thread;
	int err;

	/* Run the tests in their own thread to isolate the namespace changes
	 * so they do not affect the environment of other tests.
	 * (specifically needed because of unshare(CLONE_NEWNS) in open_netns())
	 */
	err = pthread_create(&test_thread, NULL, &test_tunnel_run_tests, NULL);
	if (ASSERT_OK(err, "pthread_create"))
		ASSERT_OK(pthread_join(test_thread, NULL), "pthread_join");
}