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selftests/bpf: Test bpf_skc_to_unix_sock() helper

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Add a new test which triggers unix_listen kernel function
to test bpf_skc_to_unix_sock helper.

Signed-off-by: Hengqi Chen <hengqi.chen@gmail.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20211021134752.1223426-3-hengqi.chen@gmail.com
This commit is contained in:
Hengqi Chen 2021-10-21 21:47:52 +08:00 committed by Alexei Starovoitov
parent 9eeb3aa33a
commit b6c4e71516
2 changed files with 94 additions and 0 deletions
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54
tools/testing/selftests/bpf/prog_tests/skc_to_unix_sock.c Normal file
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/* SPDX-License-Identifier: GPL-2.0 */
/* Copyright (c) 2021 Hengqi Chen */
#include <test_progs.h>
#include <sys/un.h>
#include "test_skc_to_unix_sock.skel.h"
static const char *sock_path = "@skc_to_unix_sock";
void test_skc_to_unix_sock(void)
{
struct test_skc_to_unix_sock *skel;
struct sockaddr_un sockaddr;
int err, sockfd = 0;
skel = test_skc_to_unix_sock__open();
if (!ASSERT_OK_PTR(skel, "could not open BPF object"))
return;
skel->rodata->my_pid = getpid();
err = test_skc_to_unix_sock__load(skel);
if (!ASSERT_OK(err, "could not load BPF object"))
goto cleanup;
err = test_skc_to_unix_sock__attach(skel);
if (!ASSERT_OK(err, "could not attach BPF object"))
goto cleanup;
/* trigger unix_listen */
sockfd = socket(AF_UNIX, SOCK_STREAM, 0);
if (!ASSERT_GT(sockfd, 0, "socket failed"))
goto cleanup;
memset(&sockaddr, 0, sizeof(sockaddr));
sockaddr.sun_family = AF_UNIX;
strncpy(sockaddr.sun_path, sock_path, strlen(sock_path));
sockaddr.sun_path[0] = '\0';
err = bind(sockfd, (struct sockaddr *)&sockaddr, sizeof(sockaddr));
if (!ASSERT_OK(err, "bind failed"))
goto cleanup;
err = listen(sockfd, 1);
if (!ASSERT_OK(err, "listen failed"))
goto cleanup;
ASSERT_EQ(strcmp(skel->bss->path, sock_path), 0, "bpf_skc_to_unix_sock failed");
cleanup:
if (sockfd)
close(sockfd);
test_skc_to_unix_sock__destroy(skel);
}

40
tools/testing/selftests/bpf/progs/test_skc_to_unix_sock.c Normal file
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/* SPDX-License-Identifier: GPL-2.0 */
/* Copyright (c) 2021 Hengqi Chen */
#include "vmlinux.h"
#include <bpf/bpf_helpers.h>
#include <bpf/bpf_tracing.h>
#include "bpf_tracing_net.h"
const volatile pid_t my_pid = 0;
char path[256] = {};
SEC("fentry/unix_listen")
int BPF_PROG(unix_listen, struct socket *sock, int backlog)
{
pid_t pid = bpf_get_current_pid_tgid() >> 32;
struct unix_sock *unix_sk;
int i, len;
if (pid != my_pid)
return 0;
unix_sk = (struct unix_sock *)bpf_skc_to_unix_sock(sock->sk);
if (!unix_sk)
return 0;
if (!UNIX_ABSTRACT(unix_sk))
return 0;
len = unix_sk->addr->len - sizeof(short);
path[0] = '@';
for (i = 1; i < len; i++) {
if (i >= sizeof(struct sockaddr_un))
break;
path[i] = unix_sk->addr->name->sun_path[i];
}
return 0;
}
char _license[] SEC("license") = "GPL";