Some tests have to stop/start a server multiple time with the same listening address. Doing so without SO_REUSADDR leads to failures due to the socket still being in TIME_WAIT right after the first instance stop/before the second instance start. Instead of letting each test manually set SO_REUSEADDR on their servers, it can be done automatically by start_server_addr for all tests (and without any major downside). Enforce SO_REUSEADDR in start_server_addr for all tests. Signed-off-by: Alexis Lothoré (eBPF Foundation) --- tools/testing/selftests/bpf/network_helpers.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-) diff --git a/tools/testing/selftests/bpf/network_helpers.c b/tools/testing/selftests/bpf/network_helpers.c index 8bb09167399a..e99b9c5e66a3 100644 --- a/tools/testing/selftests/bpf/network_helpers.c +++ b/tools/testing/selftests/bpf/network_helpers.c @@ -97,7 +97,8 @@ int settimeo(int fd, int timeout_ms) int start_server_addr(int type, const struct sockaddr_storage *addr, socklen_t addrlen, const struct network_helper_opts *opts) { - int fd; + + int on = 1, fd; if (!opts) opts = &default_opts; @@ -111,6 +112,12 @@ int start_server_addr(int type, const struct sockaddr_storage *addr, socklen_t a if (settimeo(fd, opts->timeout_ms)) goto error_close; + if (type == SOCK_STREAM && + setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on))) { + log_err("Failed to enable SO_REUSEADDR"); + goto error_close; + } + if (opts->post_socket_cb && opts->post_socket_cb(fd, opts->cb_opts)) { log_err("Failed to call post_socket_cb"); -- 2.51.2 Now that start_server_str enforces SO_REUSEADDR, there's no need to keep using start_reusport_server in tc_tunnel, especially since it only uses one server at a time. Replace start_reuseport_server with start_server_str in tc_tunnel test. Signed-off-by: Alexis Lothoré (eBPF Foundation) --- .../selftests/bpf/prog_tests/test_tc_tunnel.c | 27 ++++++++++++---------- 1 file changed, 15 insertions(+), 12 deletions(-) diff --git a/tools/testing/selftests/bpf/prog_tests/test_tc_tunnel.c b/tools/testing/selftests/bpf/prog_tests/test_tc_tunnel.c index deea90aaefad..4d29256d8714 100644 --- a/tools/testing/selftests/bpf/prog_tests/test_tc_tunnel.c +++ b/tools/testing/selftests/bpf/prog_tests/test_tc_tunnel.c @@ -69,7 +69,7 @@ struct subtest_cfg { int client_egress_prog_fd; int server_ingress_prog_fd; char extra_decap_mod_args[TUNNEL_ARGS_MAX_LEN]; - int *server_fd; + int server_fd; }; struct connection { @@ -135,16 +135,18 @@ static int run_server(struct subtest_cfg *cfg) { int family = cfg->ipproto == 6 ? AF_INET6 : AF_INET; struct nstoken *nstoken; + struct network_helper_opts opts = { + .timeout_ms = TIMEOUT_MS + }; nstoken = open_netns(SERVER_NS); if (!ASSERT_OK_PTR(nstoken, "open server ns")) return -1; - cfg->server_fd = start_reuseport_server(family, SOCK_STREAM, - cfg->server_addr, TEST_PORT, - TIMEOUT_MS, 1); + cfg->server_fd = start_server_str(family, SOCK_STREAM, cfg->server_addr, + TEST_PORT, &opts); close_netns(nstoken); - if (!ASSERT_OK_PTR(cfg->server_fd, "start server")) + if (!ASSERT_OK_FD(cfg->server_fd, "start server")) return -1; return 0; @@ -152,7 +154,7 @@ static int run_server(struct subtest_cfg *cfg) static void stop_server(struct subtest_cfg *cfg) { - free_fds(cfg->server_fd, 1); + close(cfg->server_fd); } static int check_server_rx_data(struct subtest_cfg *cfg, @@ -188,7 +190,7 @@ static struct connection *connect_client_to_server(struct subtest_cfg *cfg) return NULL; } - server_fd = accept(*cfg->server_fd, NULL, NULL); + server_fd = accept(cfg->server_fd, NULL, NULL); if (server_fd < 0) { close(client_fd); free(conn); @@ -394,29 +396,30 @@ static void run_test(struct subtest_cfg *cfg) /* Basic communication must work */ if (!ASSERT_OK(send_and_test_data(cfg, true), "connect without any encap")) - goto fail; + goto fail_close_server; /* Attach encapsulation program to client */ if (!ASSERT_OK(configure_encapsulation(cfg), "configure encapsulation")) - goto fail; + goto fail_close_server; /* If supported, insert kernel decap module, connection must succeed */ if (!cfg->expect_kern_decap_failure) { if (!ASSERT_OK(configure_kernel_decapsulation(cfg), "configure kernel decapsulation")) - goto fail; + goto fail_close_server; if (!ASSERT_OK(send_and_test_data(cfg, true), "connect with encap prog and kern decap")) - goto fail; + goto fail_close_server; } /* Replace kernel decapsulation with BPF decapsulation, test must pass */ if (!ASSERT_OK(configure_ebpf_decapsulation(cfg), "configure ebpf decapsulation")) - goto fail; + goto fail_close_server; ASSERT_OK(send_and_test_data(cfg, true), "connect with encap and decap progs"); fail: stop_server(cfg); +fail_close_server: close_netns(nstoken); } -- 2.51.2