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Message-Id: <20200506223210.93595-2-sdf@google.com>
Date: Wed, 6 May 2020 15:32:06 -0700
From: Stanislav Fomichev <sdf@...gle.com>
To: netdev@...r.kernel.org, bpf@...r.kernel.org
Cc: davem@...emloft.net, ast@...nel.org, daniel@...earbox.net,
Stanislav Fomichev <sdf@...gle.com>,
Andrey Ignatov <rdna@...com>, Martin KaFai Lau <kafai@...com>
Subject: [PATCH bpf-next v3 1/5] selftests/bpf: generalize helpers to control
background listener
Move the following routines that let us start a background listener
thread and connect to a server by fd to the test_prog:
* start_server_thread - start background INADDR_ANY thread
* stop_server_thread - stop the thread
* connect_to_fd - connect to the server identified by fd
These will be used in the next commit.
Also, extend these helpers to support AF_INET6 and accept the family
as an argument.
v3:
* export extra helper to start server without a thread (Martin KaFai Lau)
v2:
* put helpers into network_helpers.c (Andrii Nakryiko)
Cc: Andrey Ignatov <rdna@...com>
Cc: Martin KaFai Lau <kafai@...com>
Signed-off-by: Stanislav Fomichev <sdf@...gle.com>
---
tools/testing/selftests/bpf/Makefile | 2 +-
tools/testing/selftests/bpf/network_helpers.c | 164 ++++++++++++++++++
tools/testing/selftests/bpf/network_helpers.h | 12 ++
.../selftests/bpf/prog_tests/tcp_rtt.c | 116 +------------
4 files changed, 181 insertions(+), 113 deletions(-)
create mode 100644 tools/testing/selftests/bpf/network_helpers.c
create mode 100644 tools/testing/selftests/bpf/network_helpers.h
diff --git a/tools/testing/selftests/bpf/Makefile b/tools/testing/selftests/bpf/Makefile
index 3d942be23d09..8f25966b500b 100644
--- a/tools/testing/selftests/bpf/Makefile
+++ b/tools/testing/selftests/bpf/Makefile
@@ -354,7 +354,7 @@ endef
TRUNNER_TESTS_DIR := prog_tests
TRUNNER_BPF_PROGS_DIR := progs
TRUNNER_EXTRA_SOURCES := test_progs.c cgroup_helpers.c trace_helpers.c \
- flow_dissector_load.h
+ network_helpers.c flow_dissector_load.h
TRUNNER_EXTRA_FILES := $(OUTPUT)/urandom_read \
$(wildcard progs/btf_dump_test_case_*.c)
TRUNNER_BPF_BUILD_RULE := CLANG_BPF_BUILD_RULE
diff --git a/tools/testing/selftests/bpf/network_helpers.c b/tools/testing/selftests/bpf/network_helpers.c
new file mode 100644
index 000000000000..6ad16dfebfb2
--- /dev/null
+++ b/tools/testing/selftests/bpf/network_helpers.c
@@ -0,0 +1,164 @@
+// SPDX-License-Identifier: GPL-2.0-only
+#include <errno.h>
+#include <pthread.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+#include <linux/err.h>
+#include <linux/in.h>
+#include <linux/in6.h>
+
+#include "network_helpers.h"
+
+#define CHECK_FAIL(condition) ({ \
+ int __ret = !!(condition); \
+ int __save_errno = errno; \
+ if (__ret) { \
+ fprintf(stdout, "%s:FAIL:%d\n", __func__, __LINE__); \
+ } \
+ errno = __save_errno; \
+ __ret; \
+})
+
+#define clean_errno() (errno == 0 ? "None" : strerror(errno))
+#define log_err(MSG, ...) fprintf(stderr, "(%s:%d: errno: %s) " MSG "\n", \
+ __FILE__, __LINE__, clean_errno(), ##__VA_ARGS__)
+
+int start_server(int family, int type)
+{
+ struct sockaddr_storage addr = {};
+ socklen_t len;
+ int fd;
+
+ if (family == AF_INET) {
+ struct sockaddr_in *sin = (void *)&addr;
+
+ sin->sin_family = AF_INET;
+ len = sizeof(*sin);
+ } else {
+ struct sockaddr_in6 *sin6 = (void *)&addr;
+
+ sin6->sin6_family = AF_INET6;
+ len = sizeof(*sin6);
+ }
+
+ fd = socket(family, type | SOCK_NONBLOCK, 0);
+ if (fd < 0) {
+ log_err("Failed to create server socket");
+ return -1;
+ }
+
+ if (bind(fd, (const struct sockaddr *)&addr, len) < 0) {
+ log_err("Failed to bind socket");
+ close(fd);
+ return -1;
+ }
+
+ if (type == SOCK_STREAM) {
+ if (listen(fd, 1) < 0) {
+ log_err("Failed to listed on socket");
+ close(fd);
+ return -1;
+ }
+ }
+
+ return fd;
+}
+
+static pthread_mutex_t server_started_mtx = PTHREAD_MUTEX_INITIALIZER;
+static pthread_cond_t server_started = PTHREAD_COND_INITIALIZER;
+static volatile bool server_done;
+pthread_t server_tid;
+
+static void *server_thread(void *arg)
+{
+ struct sockaddr_storage addr;
+ socklen_t len = sizeof(addr);
+ int fd = *(int *)arg;
+ int client_fd;
+
+ pthread_mutex_lock(&server_started_mtx);
+ pthread_cond_signal(&server_started);
+ pthread_mutex_unlock(&server_started_mtx);
+
+ while (true) {
+ client_fd = accept(fd, (struct sockaddr *)&addr, &len);
+ if (client_fd == -1 && errno == EAGAIN) {
+ usleep(50);
+ continue;
+ }
+ break;
+ }
+ if (CHECK_FAIL(client_fd < 0)) {
+ perror("Failed to accept client");
+ return ERR_PTR(-1);
+ }
+
+ while (!server_done)
+ usleep(50);
+
+ close(client_fd);
+
+ return NULL;
+}
+
+int start_server_thread(int family, int type)
+{
+ int fd = start_server(family, type);
+
+ if (fd < 0)
+ return -1;
+
+ if (CHECK_FAIL(pthread_create(&server_tid, NULL, server_thread,
+ (void *)&fd)))
+ goto err;
+
+ pthread_mutex_lock(&server_started_mtx);
+ pthread_cond_wait(&server_started, &server_started_mtx);
+ pthread_mutex_unlock(&server_started_mtx);
+
+ return fd;
+err:
+ close(fd);
+ return -1;
+}
+
+void stop_server_thread(int fd)
+{
+ void *server_res;
+
+ server_done = true;
+ CHECK_FAIL(pthread_join(server_tid, &server_res));
+ CHECK_FAIL(IS_ERR(server_res));
+ close(fd);
+}
+
+int connect_to_fd(int family, int type, int server_fd)
+{
+ struct sockaddr_storage addr;
+ socklen_t len = sizeof(addr);
+ int fd;
+
+ fd = socket(family, type, 0);
+ if (fd < 0) {
+ log_err("Failed to create client socket");
+ return -1;
+ }
+
+ if (getsockname(server_fd, (struct sockaddr *)&addr, &len)) {
+ log_err("Failed to get server addr");
+ goto out;
+ }
+
+ if (connect(fd, (const struct sockaddr *)&addr, len) < 0) {
+ log_err("Fail to connect to server with family %d", family);
+ goto out;
+ }
+
+ return fd;
+
+out:
+ close(fd);
+ return -1;
+}
diff --git a/tools/testing/selftests/bpf/network_helpers.h b/tools/testing/selftests/bpf/network_helpers.h
new file mode 100644
index 000000000000..4ed31706b7f4
--- /dev/null
+++ b/tools/testing/selftests/bpf/network_helpers.h
@@ -0,0 +1,12 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __NETWORK_HELPERS_H
+#define __NETWORK_HELPERS_H
+#include <sys/socket.h>
+#include <sys/types.h>
+
+int start_server(int family, int type);
+int start_server_thread(int family, int type);
+void stop_server_thread(int fd);
+int connect_to_fd(int family, int type, int server_fd);
+
+#endif
diff --git a/tools/testing/selftests/bpf/prog_tests/tcp_rtt.c b/tools/testing/selftests/bpf/prog_tests/tcp_rtt.c
index e56b52ab41da..4aaa1e6e33ad 100644
--- a/tools/testing/selftests/bpf/prog_tests/tcp_rtt.c
+++ b/tools/testing/selftests/bpf/prog_tests/tcp_rtt.c
@@ -1,6 +1,7 @@
// SPDX-License-Identifier: GPL-2.0
#include <test_progs.h>
#include "cgroup_helpers.h"
+#include "network_helpers.h"
struct tcp_rtt_storage {
__u32 invoked;
@@ -87,34 +88,6 @@ static int verify_sk(int map_fd, int client_fd, const char *msg, __u32 invoked,
return err;
}
-static int connect_to_server(int server_fd)
-{
- struct sockaddr_storage addr;
- socklen_t len = sizeof(addr);
- int fd;
-
- fd = socket(AF_INET, SOCK_STREAM, 0);
- if (fd < 0) {
- log_err("Failed to create client socket");
- return -1;
- }
-
- if (getsockname(server_fd, (struct sockaddr *)&addr, &len)) {
- log_err("Failed to get server addr");
- goto out;
- }
-
- if (connect(fd, (const struct sockaddr *)&addr, len) < 0) {
- log_err("Fail to connect to server");
- goto out;
- }
-
- return fd;
-
-out:
- close(fd);
- return -1;
-}
static int run_test(int cgroup_fd, int server_fd)
{
@@ -145,7 +118,7 @@ static int run_test(int cgroup_fd, int server_fd)
goto close_bpf_object;
}
- client_fd = connect_to_server(server_fd);
+ client_fd = connect_to_fd(AF_INET, SOCK_STREAM, server_fd);
if (client_fd < 0) {
err = -1;
goto close_bpf_object;
@@ -180,103 +153,22 @@ static int run_test(int cgroup_fd, int server_fd)
return err;
}
-static int start_server(void)
-{
- struct sockaddr_in addr = {
- .sin_family = AF_INET,
- .sin_addr.s_addr = htonl(INADDR_LOOPBACK),
- };
- int fd;
-
- fd = socket(AF_INET, SOCK_STREAM | SOCK_NONBLOCK, 0);
- if (fd < 0) {
- log_err("Failed to create server socket");
- return -1;
- }
-
- if (bind(fd, (const struct sockaddr *)&addr, sizeof(addr)) < 0) {
- log_err("Failed to bind socket");
- close(fd);
- return -1;
- }
-
- return fd;
-}
-
-static pthread_mutex_t server_started_mtx = PTHREAD_MUTEX_INITIALIZER;
-static pthread_cond_t server_started = PTHREAD_COND_INITIALIZER;
-static volatile bool server_done = false;
-
-static void *server_thread(void *arg)
-{
- struct sockaddr_storage addr;
- socklen_t len = sizeof(addr);
- int fd = *(int *)arg;
- int client_fd;
- int err;
-
- err = listen(fd, 1);
-
- pthread_mutex_lock(&server_started_mtx);
- pthread_cond_signal(&server_started);
- pthread_mutex_unlock(&server_started_mtx);
-
- if (CHECK_FAIL(err < 0)) {
- perror("Failed to listed on socket");
- return ERR_PTR(err);
- }
-
- while (true) {
- client_fd = accept(fd, (struct sockaddr *)&addr, &len);
- if (client_fd == -1 && errno == EAGAIN) {
- usleep(50);
- continue;
- }
- break;
- }
- if (CHECK_FAIL(client_fd < 0)) {
- perror("Failed to accept client");
- return ERR_PTR(err);
- }
-
- while (!server_done)
- usleep(50);
-
- close(client_fd);
-
- return NULL;
-}
-
void test_tcp_rtt(void)
{
int server_fd, cgroup_fd;
- pthread_t tid;
- void *server_res;
cgroup_fd = test__join_cgroup("/tcp_rtt");
if (CHECK_FAIL(cgroup_fd < 0))
return;
- server_fd = start_server();
+ server_fd = start_server_thread(AF_INET, SOCK_STREAM);
if (CHECK_FAIL(server_fd < 0))
goto close_cgroup_fd;
- if (CHECK_FAIL(pthread_create(&tid, NULL, server_thread,
- (void *)&server_fd)))
- goto close_server_fd;
-
- pthread_mutex_lock(&server_started_mtx);
- pthread_cond_wait(&server_started, &server_started_mtx);
- pthread_mutex_unlock(&server_started_mtx);
-
CHECK_FAIL(run_test(cgroup_fd, server_fd));
- server_done = true;
- CHECK_FAIL(pthread_join(tid, &server_res));
- CHECK_FAIL(IS_ERR(server_res));
+ stop_server_thread(server_fd);
-close_server_fd:
- close(server_fd);
close_cgroup_fd:
close(cgroup_fd);
}
--
2.26.2.526.g744177e7f7-goog
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