Subject: Re: [PATCH bpf,v2 4/4] selftests/bpf: Add tc_socket_lookup tests

From: Stanislav Fomichev <[email-masked]>
Date: Thu, 20 Apr 2023 09:44:04 -0700

On 04/20, Gilad Sever wrote:
> Verify that socket lookup via TC with all BPF APIs is VRF aware.
> 
> Signed-off-by: Gilad Sever <[email-masked]>
> ---
> v2: Fix build by initializing vars with -1
> ---
>  .../bpf/prog_tests/tc_socket_lookup.c         | 341 ++++++++++++++++++
>  .../selftests/bpf/progs/tc_socket_lookup.c    |  73 ++++
>  2 files changed, 414 insertions(+)
>  create mode 100644 tools/testing/selftests/bpf/prog_tests/tc_socket_lookup.c
>  create mode 100644 tools/testing/selftests/bpf/progs/tc_socket_lookup.c
> 
> diff --git a/tools/testing/selftests/bpf/prog_tests/tc_socket_lookup.c b/tools/testing/selftests/bpf/prog_tests/tc_socket_lookup.c
> new file mode 100644
> index 000000000000..5dcaf0ea3f8c
> --- /dev/null
> +++ b/tools/testing/selftests/bpf/prog_tests/tc_socket_lookup.c
> @@ -0,0 +1,341 @@
> +// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
> +
> +/*
> + * Topology:
> + * ---------
> + *     NS1 namespace         |   NS2 namespace
> + *			     |
> + *     +--------------+      |   +--------------+
> + *     |    veth01    |----------|    veth10    |
> + *     | 172.16.1.100 |      |   | 172.16.1.200 |
> + *     |     bpf      |      |   +--------------+
> + *     +--------------+      |
> + *      server(UDP/TCP)      |
> + *  +-------------------+    |
> + *  |        vrf1       |    |
> + *  |  +--------------+ |    |   +--------------+
> + *  |  |    veth02    |----------|    veth20    |
> + *  |  | 172.16.2.100 | |    |   | 172.16.2.200 |
> + *  |  |     bpf      | |    |   +--------------+
> + *  |  +--------------+ |    |
> + *  |   server(UDP/TCP) |    |
> + *  +-------------------+    |
> + *
> + * Test flow
> + * -----------
> + *  The tests verifies that socket lookup via TC is VRF aware:
> + *  1) Creates two veth pairs between NS1 and NS2:
> + *     a) veth01 <-> veth10 outside the VRF
> + *     b) veth02 <-> veth20 in the VRF
> + *  2) Attaches to veth01 and veth02 a program that calls:
> + *     a) bpf_skc_lookup_tcp() with TCP and tcp_skc is true
> + *     b) bpf_sk_lookup_tcp() with TCP and tcp_skc is false
> + *     c) bpf_sk_lookup_udp() with UDP
> + *     The program stores the lookup result in bss->lookup_status.
> + *  3) Creates a socket TCP/UDP server in/outside the VRF.
> + *  4) The test expects lookup_status to be:
> + *     a) 0 from device in VRF to server outside VRF
> + *     b) 0 from device outside VRF to server in VRF
> + *     c) 1 from device in VRF to server in VRF
> + *     d) 1 from device outside VRF to server outside VRF
> + */
> +
> +#include <net/if.h>
> +
> +#include "test_progs.h"
> +#include "network_helpers.h"
> +#include "tc_socket_lookup.skel.h"
> +
> +#define NS1 "tc_socket_lookup_1"
> +#define NS2 "tc_socket_lookup_2"
> +
> +#define IP4_ADDR_VETH01 "172.16.1.100"
> +#define IP4_ADDR_VETH10 "172.16.1.200"
> +#define IP4_ADDR_VETH02 "172.16.2.100"
> +#define IP4_ADDR_VETH20 "172.16.2.200"
> +
> +#define NON_VRF_PORT 5000
> +#define IN_VRF_PORT 5001
> +
> +#define IO_TIMEOUT_SEC	3
> +
> +#define SYS(fmt, ...)						\
> +	({							\
> +		char cmd[1024];					\
> +		snprintf(cmd, sizeof(cmd), fmt, ##__VA_ARGS__);	\
> +		if (!ASSERT_OK(system(cmd), cmd))		\
> +			goto fail;				\
> +	})
> +
> +#define SYS_NOFAIL(fmt, ...)					\
> +	({							\
> +		char cmd[1024];					\
> +		snprintf(cmd, sizeof(cmd), fmt, ##__VA_ARGS__);	\
> +		system(cmd);					\
> +	})

[..]

> +static int make_socket(int sotype, const char *ip, int port,
> +		       struct sockaddr_storage *addr)
> +{
> +	struct timeval timeo = { .tv_sec = IO_TIMEOUT_SEC };
> +	int err, fd;
> +
> +	err = make_sockaddr(AF_INET, ip, port, addr, NULL);
> +	if (!ASSERT_OK(err, "make_address"))
> +		return -1;
> +
> +	fd = socket(AF_INET, sotype, 0);
> +	if (!ASSERT_OK(fd < 0, "socket"))
> +		return -1;
> +
> +	err = setsockopt(fd, SOL_SOCKET, SO_SNDTIMEO, &timeo, sizeof(timeo));
> +	if (!ASSERT_OK(err, "setsockopt(SO_SNDTIMEO)"))
> +		goto fail;
> +
> +	err = setsockopt(fd, SOL_SOCKET, SO_RCVTIMEO, &timeo, sizeof(timeo));
> +	if (!ASSERT_OK(err, "setsockopt(SO_RCVTIMEO)"))
> +		goto fail;
> +
> +	return fd;
> +fail:
> +	close(fd);
> +	return -1;
> +}
> +
> +static int make_server(int sotype, const char *ip, int port, const char *ifname)
> +{
> +	struct sockaddr_storage addr = {};
> +	const int one = 1;
> +	int err, fd = -1;
> +
> +	fd = make_socket(sotype, ip, port, &addr);
> +	if (fd < 0)
> +		return -1;
> +
> +	if (sotype == SOCK_STREAM) {
> +		err = setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &one,
> +				 sizeof(one));
> +		if (!ASSERT_OK(err, "setsockopt(SO_REUSEADDR)"))
> +			goto fail;
> +	}
> +
> +	if (ifname) {
> +		err = setsockopt(fd, SOL_SOCKET, SO_BINDTODEVICE,
> +				 ifname, strlen(ifname) + 1);
> +		if (!ASSERT_OK(err, "setsockopt(SO_BINDTODEVICE)"))
> +			goto fail;
> +	}
> +
> +	err = bind(fd, (void *)&addr, sizeof(struct sockaddr_in));
> +	if (!ASSERT_OK(err, "bind"))
> +		goto fail;
> +
> +	if (sotype == SOCK_STREAM) {
> +		err = listen(fd, SOMAXCONN);
> +		if (!ASSERT_OK(err, "listen"))
> +			goto fail;
> +	}
> +
> +	return fd;
> +fail:
> +	close(fd);
> +	return -1;
> +}

Any reason you're not using start_server from network_helpers.h?