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-rw-r--r--tools/testing/selftests/bpf/prog_tests/bpf_iter_setsockopt.c226
1 files changed, 226 insertions, 0 deletions
diff --git a/tools/testing/selftests/bpf/prog_tests/bpf_iter_setsockopt.c b/tools/testing/selftests/bpf/prog_tests/bpf_iter_setsockopt.c
new file mode 100644
index 000000000000..85babb0487b3
--- /dev/null
+++ b/tools/testing/selftests/bpf/prog_tests/bpf_iter_setsockopt.c
@@ -0,0 +1,226 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright (c) 2021 Facebook */
+#define _GNU_SOURCE
+#include <sched.h>
+#include <test_progs.h>
+#include "network_helpers.h"
+#include "bpf_dctcp.skel.h"
+#include "bpf_cubic.skel.h"
+#include "bpf_iter_setsockopt.skel.h"
+
+static int create_netns(void)
+{
+ if (!ASSERT_OK(unshare(CLONE_NEWNET), "create netns"))
+ return -1;
+
+ if (!ASSERT_OK(system("ip link set dev lo up"), "bring up lo"))
+ return -1;
+
+ return 0;
+}
+
+static unsigned int set_bpf_cubic(int *fds, unsigned int nr_fds)
+{
+ unsigned int i;
+
+ for (i = 0; i < nr_fds; i++) {
+ if (setsockopt(fds[i], SOL_TCP, TCP_CONGESTION, "bpf_cubic",
+ sizeof("bpf_cubic")))
+ return i;
+ }
+
+ return nr_fds;
+}
+
+static unsigned int check_bpf_dctcp(int *fds, unsigned int nr_fds)
+{
+ char tcp_cc[16];
+ socklen_t optlen = sizeof(tcp_cc);
+ unsigned int i;
+
+ for (i = 0; i < nr_fds; i++) {
+ if (getsockopt(fds[i], SOL_TCP, TCP_CONGESTION,
+ tcp_cc, &optlen) ||
+ strcmp(tcp_cc, "bpf_dctcp"))
+ return i;
+ }
+
+ return nr_fds;
+}
+
+static int *make_established(int listen_fd, unsigned int nr_est,
+ int **paccepted_fds)
+{
+ int *est_fds, *accepted_fds;
+ unsigned int i;
+
+ est_fds = malloc(sizeof(*est_fds) * nr_est);
+ if (!est_fds)
+ return NULL;
+
+ accepted_fds = malloc(sizeof(*accepted_fds) * nr_est);
+ if (!accepted_fds) {
+ free(est_fds);
+ return NULL;
+ }
+
+ for (i = 0; i < nr_est; i++) {
+ est_fds[i] = connect_to_fd(listen_fd, 0);
+ if (est_fds[i] == -1)
+ break;
+ if (set_bpf_cubic(&est_fds[i], 1) != 1) {
+ close(est_fds[i]);
+ break;
+ }
+
+ accepted_fds[i] = accept(listen_fd, NULL, 0);
+ if (accepted_fds[i] == -1) {
+ close(est_fds[i]);
+ break;
+ }
+ }
+
+ if (!ASSERT_EQ(i, nr_est, "create established fds")) {
+ free_fds(accepted_fds, i);
+ free_fds(est_fds, i);
+ return NULL;
+ }
+
+ *paccepted_fds = accepted_fds;
+ return est_fds;
+}
+
+static unsigned short get_local_port(int fd)
+{
+ struct sockaddr_in6 addr;
+ socklen_t addrlen = sizeof(addr);
+
+ if (!getsockname(fd, &addr, &addrlen))
+ return ntohs(addr.sin6_port);
+
+ return 0;
+}
+
+static void do_bpf_iter_setsockopt(struct bpf_iter_setsockopt *iter_skel,
+ bool random_retry)
+{
+ int *reuse_listen_fds = NULL, *accepted_fds = NULL, *est_fds = NULL;
+ unsigned int nr_reuse_listens = 256, nr_est = 256;
+ int err, iter_fd = -1, listen_fd = -1;
+ char buf;
+
+ /* Prepare non-reuseport listen_fd */
+ listen_fd = start_server(AF_INET6, SOCK_STREAM, "::1", 0, 0);
+ if (!ASSERT_GE(listen_fd, 0, "start_server"))
+ return;
+ if (!ASSERT_EQ(set_bpf_cubic(&listen_fd, 1), 1,
+ "set listen_fd to cubic"))
+ goto done;
+ iter_skel->bss->listen_hport = get_local_port(listen_fd);
+ if (!ASSERT_NEQ(iter_skel->bss->listen_hport, 0,
+ "get_local_port(listen_fd)"))
+ goto done;
+
+ /* Connect to non-reuseport listen_fd */
+ est_fds = make_established(listen_fd, nr_est, &accepted_fds);
+ if (!ASSERT_OK_PTR(est_fds, "create established"))
+ goto done;
+
+ /* Prepare reuseport listen fds */
+ reuse_listen_fds = start_reuseport_server(AF_INET6, SOCK_STREAM,
+ "::1", 0, 0,
+ nr_reuse_listens);
+ if (!ASSERT_OK_PTR(reuse_listen_fds, "start_reuseport_server"))
+ goto done;
+ if (!ASSERT_EQ(set_bpf_cubic(reuse_listen_fds, nr_reuse_listens),
+ nr_reuse_listens, "set reuse_listen_fds to cubic"))
+ goto done;
+ iter_skel->bss->reuse_listen_hport = get_local_port(reuse_listen_fds[0]);
+ if (!ASSERT_NEQ(iter_skel->bss->reuse_listen_hport, 0,
+ "get_local_port(reuse_listen_fds[0])"))
+ goto done;
+
+ /* Run bpf tcp iter to switch from bpf_cubic to bpf_dctcp */
+ iter_skel->bss->random_retry = random_retry;
+ iter_fd = bpf_iter_create(bpf_link__fd(iter_skel->links.change_tcp_cc));
+ if (!ASSERT_GE(iter_fd, 0, "create iter_fd"))
+ goto done;
+
+ while ((err = read(iter_fd, &buf, sizeof(buf))) == -1 &&
+ errno == EAGAIN)
+ ;
+ if (!ASSERT_OK(err, "read iter error"))
+ goto done;
+
+ /* Check reuseport listen fds for dctcp */
+ ASSERT_EQ(check_bpf_dctcp(reuse_listen_fds, nr_reuse_listens),
+ nr_reuse_listens,
+ "check reuse_listen_fds dctcp");
+
+ /* Check non reuseport listen fd for dctcp */
+ ASSERT_EQ(check_bpf_dctcp(&listen_fd, 1), 1,
+ "check listen_fd dctcp");
+
+ /* Check established fds for dctcp */
+ ASSERT_EQ(check_bpf_dctcp(est_fds, nr_est), nr_est,
+ "check est_fds dctcp");
+
+ /* Check accepted fds for dctcp */
+ ASSERT_EQ(check_bpf_dctcp(accepted_fds, nr_est), nr_est,
+ "check accepted_fds dctcp");
+
+done:
+ if (iter_fd != -1)
+ close(iter_fd);
+ if (listen_fd != -1)
+ close(listen_fd);
+ free_fds(reuse_listen_fds, nr_reuse_listens);
+ free_fds(accepted_fds, nr_est);
+ free_fds(est_fds, nr_est);
+}
+
+void test_bpf_iter_setsockopt(void)
+{
+ struct bpf_iter_setsockopt *iter_skel = NULL;
+ struct bpf_cubic *cubic_skel = NULL;
+ struct bpf_dctcp *dctcp_skel = NULL;
+ struct bpf_link *cubic_link = NULL;
+ struct bpf_link *dctcp_link = NULL;
+
+ if (create_netns())
+ return;
+
+ /* Load iter_skel */
+ iter_skel = bpf_iter_setsockopt__open_and_load();
+ if (!ASSERT_OK_PTR(iter_skel, "iter_skel"))
+ return;
+ iter_skel->links.change_tcp_cc = bpf_program__attach_iter(iter_skel->progs.change_tcp_cc, NULL);
+ if (!ASSERT_OK_PTR(iter_skel->links.change_tcp_cc, "attach iter"))
+ goto done;
+
+ /* Load bpf_cubic */
+ cubic_skel = bpf_cubic__open_and_load();
+ if (!ASSERT_OK_PTR(cubic_skel, "cubic_skel"))
+ goto done;
+ cubic_link = bpf_map__attach_struct_ops(cubic_skel->maps.cubic);
+ if (!ASSERT_OK_PTR(cubic_link, "cubic_link"))
+ goto done;
+
+ /* Load bpf_dctcp */
+ dctcp_skel = bpf_dctcp__open_and_load();
+ if (!ASSERT_OK_PTR(dctcp_skel, "dctcp_skel"))
+ goto done;
+ dctcp_link = bpf_map__attach_struct_ops(dctcp_skel->maps.dctcp);
+ if (!ASSERT_OK_PTR(dctcp_link, "dctcp_link"))
+ goto done;
+
+ do_bpf_iter_setsockopt(iter_skel, true);
+ do_bpf_iter_setsockopt(iter_skel, false);
+
+done:
+ bpf_link__destroy(cubic_link);
+ bpf_link__destroy(dctcp_link);
+ bpf_cubic__destroy(cubic_skel);
+ bpf_dctcp__destroy(dctcp_skel);
+ bpf_iter_setsockopt__destroy(iter_skel);
+}