On Thu, May 07, 2020 at 12:12:12PM -0700, Stanislav Fomichev wrote:
> 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 - socket+bind+listen
> * 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.
>
> v4:
> * export extra helper to start server without a thread (Martin KaFai Lau)
> * tcp_rtt is no longer starting background thread (Martin KaFai Lau)
>
> v2:
> * put helpers into network_helpers.c (Andrii Nakryiko)
>
> Cc: Andrey Ignatov <rdna@xxxxxx>
> Cc: Martin KaFai Lau <kafai@xxxxxx>
> Cc: Jakub Sitnicki <jakub@xxxxxxxxxxxxxx>
> Signed-off-by: Stanislav Fomichev <sdf@xxxxxxxxxx>
> ---
> tools/testing/selftests/bpf/Makefile | 2 +-
> tools/testing/selftests/bpf/network_helpers.c | 86 +++++++++++++
> tools/testing/selftests/bpf/network_helpers.h | 10 ++
> .../selftests/bpf/prog_tests/tcp_rtt.c | 116 +-----------------
> 4 files changed, 101 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..8ea2b045452e
> --- /dev/null
> +++ b/tools/testing/selftests/bpf/network_helpers.c
> @@ -0,0 +1,86 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +#include <errno.h>
> +#include <pthread.h>
No longer needed.
> +#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 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;
> +}
> +
> +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;
> + }
> +
Please also set a connect timeout. Snippet from sk_assign.c:
const struct timeval timeo_sec = { .tv_sec = 3 };
const size_t timeo_optlen = sizeof(timeo_sec);
setsockopt(fd, SOL_SOCKET, SO_SNDTIMEO, &timeo_sec, timeo_optlen);
Other than that,
Acked-by: Martin KaFai Lau <kafai@xxxxxx>
> + 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;
> +}
