Commit 7ff8985c authored by Kuniyuki Iwashima's avatar Kuniyuki Iwashima Committed by Alexei Starovoitov
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selftest/bpf: Test batching and bpf_(get|set)sockopt in bpf unix iter. 



This patch adds a test for the batching and bpf_(get|set)sockopt in bpf
unix iter.

It does the following.

  1. Creates an abstract UNIX domain socket
  2. Call bpf_setsockopt()
  3. Call bpf_getsockopt() and save the value
  4. Call setsockopt()
  5. Call getsockopt() and save the value
  6. Compare the saved values

Signed-off-by: default avatarKuniyuki Iwashima <kuniyu@amazon.co.jp>
Link: https://lore.kernel.org/r/20220113002849.4384-5-kuniyu@amazon.co.jp


Signed-off-by: default avatarAlexei Starovoitov <ast@kernel.org>
parent eb7d8f1d

tools/testing/selftests/bpf/prog_tests/bpf_iter_setsockopt_unix.c

0 → 100644
+100 −0
Original line number Diff line number Diff line 
// SPDX-License-Identifier: GPL-2.0

/* Copyright Amazon.com Inc. or its affiliates. */

#include <sys/socket.h>

#include <sys/un.h>

#include <test_progs.h>

#include "bpf_iter_setsockopt_unix.skel.h"



#define NR_CASES 5



static int create_unix_socket(struct bpf_iter_setsockopt_unix *skel)

{

	struct sockaddr_un addr = {

		.sun_family = AF_UNIX,

		.sun_path = "",

	};

	socklen_t len;

	int fd, err;



	fd = socket(AF_UNIX, SOCK_STREAM, 0);

	if (!ASSERT_NEQ(fd, -1, "socket"))

		return -1;



	len = offsetof(struct sockaddr_un, sun_path);

	err = bind(fd, (struct sockaddr *)&addr, len);

	if (!ASSERT_OK(err, "bind"))

		return -1;



	len = sizeof(addr);

	err = getsockname(fd, (struct sockaddr *)&addr, &len);

	if (!ASSERT_OK(err, "getsockname"))

		return -1;



	memcpy(&skel->bss->sun_path, &addr.sun_path,

	       len - offsetof(struct sockaddr_un, sun_path));



	return fd;

}



static void test_sndbuf(struct bpf_iter_setsockopt_unix *skel, int fd)

{

	socklen_t optlen;

	int i, err;



	for (i = 0; i < NR_CASES; i++) {

		if (!ASSERT_NEQ(skel->data->sndbuf_getsockopt[i], -1,

				"bpf_(get|set)sockopt"))

			return;



		err = setsockopt(fd, SOL_SOCKET, SO_SNDBUF,

				 &(skel->data->sndbuf_setsockopt[i]),

				 sizeof(skel->data->sndbuf_setsockopt[i]));

		if (!ASSERT_OK(err, "setsockopt"))

			return;



		optlen = sizeof(skel->bss->sndbuf_getsockopt_expected[i]);

		err = getsockopt(fd, SOL_SOCKET, SO_SNDBUF,

				 &(skel->bss->sndbuf_getsockopt_expected[i]),

				 &optlen);

		if (!ASSERT_OK(err, "getsockopt"))

			return;



		if (!ASSERT_EQ(skel->data->sndbuf_getsockopt[i],

			       skel->bss->sndbuf_getsockopt_expected[i],

			       "bpf_(get|set)sockopt"))

			return;

	}

}



void test_bpf_iter_setsockopt_unix(void)

{

	struct bpf_iter_setsockopt_unix *skel;

	int err, unix_fd, iter_fd;

	char buf;



	skel = bpf_iter_setsockopt_unix__open_and_load();

	if (!ASSERT_OK_PTR(skel, "open_and_load"))

		return;



	unix_fd = create_unix_socket(skel);

	if (!ASSERT_NEQ(unix_fd, -1, "create_unix_server"))

		goto destroy;



	skel->links.change_sndbuf = bpf_program__attach_iter(skel->progs.change_sndbuf, NULL);

	if (!ASSERT_OK_PTR(skel->links.change_sndbuf, "bpf_program__attach_iter"))

		goto destroy;



	iter_fd = bpf_iter_create(bpf_link__fd(skel->links.change_sndbuf));

	if (!ASSERT_GE(iter_fd, 0, "bpf_iter_create"))

		goto destroy;



	while ((err = read(iter_fd, &buf, sizeof(buf))) == -1 &&

	       errno == EAGAIN)

		;

	if (!ASSERT_OK(err, "read iter error"))

		goto destroy;



	test_sndbuf(skel, unix_fd);

destroy:

	bpf_iter_setsockopt_unix__destroy(skel);

}

tools/testing/selftests/bpf/progs/bpf_iter_setsockopt_unix.c

0 → 100644
+60 −0
Original line number Diff line number Diff line 
// SPDX-License-Identifier: GPL-2.0

/* Copyright Amazon.com Inc. or its affiliates. */

#include "bpf_iter.h"

#include "bpf_tracing_net.h"

#include <bpf/bpf_helpers.h>

#include <limits.h>



#define AUTOBIND_LEN 6

char sun_path[AUTOBIND_LEN];



#define NR_CASES 5

int sndbuf_setsockopt[NR_CASES] = {-1, 0, 8192, INT_MAX / 2, INT_MAX};

int sndbuf_getsockopt[NR_CASES] = {-1, -1, -1, -1, -1};

int sndbuf_getsockopt_expected[NR_CASES];



static inline int cmpname(struct unix_sock *unix_sk)

{

	int i;



	for (i = 0; i < AUTOBIND_LEN; i++) {

		if (unix_sk->addr->name->sun_path[i] != sun_path[i])

			return -1;

	}



	return 0;

}



SEC("iter/unix")

int change_sndbuf(struct bpf_iter__unix *ctx)

{

	struct unix_sock *unix_sk = ctx->unix_sk;

	int i, err;



	if (!unix_sk || !unix_sk->addr)

		return 0;



	if (unix_sk->addr->name->sun_path[0])

		return 0;



	if (cmpname(unix_sk))

		return 0;



	for (i = 0; i < NR_CASES; i++) {

		err = bpf_setsockopt(unix_sk, SOL_SOCKET, SO_SNDBUF,

				     &sndbuf_setsockopt[i],

				     sizeof(sndbuf_setsockopt[i]));

		if (err)

			break;



		err = bpf_getsockopt(unix_sk, SOL_SOCKET, SO_SNDBUF,

				     &sndbuf_getsockopt[i],

				     sizeof(sndbuf_getsockopt[i]));

		if (err)

			break;

	}



	return 0;

}



char _license[] SEC("license") = "GPL";

tools/testing/selftests/bpf/progs/bpf_tracing_net.h

+2 −0
Original line number Diff line number Diff line
@@ -5,6 +5,8 @@ 
#define AF_INET			2

#define AF_INET6		10



#define SOL_SOCKET		1

#define SO_SNDBUF		7

#define __SO_ACCEPTCON		(1 << 16)



#define SOL_TCP			6