kernel
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linux-6.8.1/tools/testing/selftests/bpf/prog_tests
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// SPDX-License-Identifier: GPL-2.0
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#include <test_progs.h>
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#include <bpf/bpf_endian.h>
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#include "sock_destroy_prog.skel.h"
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#include "sock_destroy_prog_fail.skel.h"
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#include "network_helpers.h"
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#define TEST_NS "sock_destroy_netns"
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static void start_iter_sockets(struct bpf_program *prog)
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{
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struct bpf_link *link;
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char buf[50] = {};
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int iter_fd, len;
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link = bpf_program__attach_iter(prog, NULL);
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if (!ASSERT_OK_PTR(link, "attach_iter"))
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return;
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iter_fd = bpf_iter_create(bpf_link__fd(link));
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if (!ASSERT_GE(iter_fd, 0, "create_iter"))
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goto free_link;
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while ((len = read(iter_fd, buf, sizeof(buf))) > 0)
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;
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ASSERT_GE(len, 0, "read");
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close(iter_fd);
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free_link:
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bpf_link__destroy(link);
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}
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static void test_tcp_client(struct sock_destroy_prog *skel)
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{
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int serv = -1, clien = -1, accept_serv = -1, n;
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serv = start_server(AF_INET6, SOCK_STREAM, NULL, 0, 0);
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if (!ASSERT_GE(serv, 0, "start_server"))
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goto cleanup;
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clien = connect_to_fd(serv, 0);
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if (!ASSERT_GE(clien, 0, "connect_to_fd"))
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goto cleanup;
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accept_serv = accept(serv, NULL, NULL);
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if (!ASSERT_GE(accept_serv, 0, "serv accept"))
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goto cleanup;
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n = send(clien, "t", 1, 0);
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if (!ASSERT_EQ(n, 1, "client send"))
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goto cleanup;
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/* Run iterator program that destroys connected client sockets. */
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start_iter_sockets(skel->progs.iter_tcp6_client);
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n = send(clien, "t", 1, 0);
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if (!ASSERT_LT(n, 0, "client_send on destroyed socket"))
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goto cleanup;
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ASSERT_EQ(errno, ECONNABORTED, "error code on destroyed socket");
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cleanup:
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if (clien != -1)
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close(clien);
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if (accept_serv != -1)
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close(accept_serv);
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if (serv != -1)
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close(serv);
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}
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static void test_tcp_server(struct sock_destroy_prog *skel)
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{
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int serv = -1, clien = -1, accept_serv = -1, n, serv_port;
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serv = start_server(AF_INET6, SOCK_STREAM, NULL, 0, 0);
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if (!ASSERT_GE(serv, 0, "start_server"))
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goto cleanup;
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serv_port = get_socket_local_port(serv);
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if (!ASSERT_GE(serv_port, 0, "get_sock_local_port"))
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goto cleanup;
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skel->bss->serv_port = (__be16) serv_port;
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clien = connect_to_fd(serv, 0);
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if (!ASSERT_GE(clien, 0, "connect_to_fd"))
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goto cleanup;
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accept_serv = accept(serv, NULL, NULL);
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if (!ASSERT_GE(accept_serv, 0, "serv accept"))
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goto cleanup;
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n = send(clien, "t", 1, 0);
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if (!ASSERT_EQ(n, 1, "client send"))
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goto cleanup;
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/* Run iterator program that destroys server sockets. */
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start_iter_sockets(skel->progs.iter_tcp6_server);
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n = send(clien, "t", 1, 0);
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if (!ASSERT_LT(n, 0, "client_send on destroyed socket"))
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goto cleanup;
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ASSERT_EQ(errno, ECONNRESET, "error code on destroyed socket");
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cleanup:
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if (clien != -1)
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close(clien);
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if (accept_serv != -1)
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close(accept_serv);
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if (serv != -1)
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close(serv);
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}
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static void test_udp_client(struct sock_destroy_prog *skel)
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{
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int serv = -1, clien = -1, n = 0;
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serv = start_server(AF_INET6, SOCK_DGRAM, NULL, 0, 0);
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if (!ASSERT_GE(serv, 0, "start_server"))
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goto cleanup;
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clien = connect_to_fd(serv, 0);
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if (!ASSERT_GE(clien, 0, "connect_to_fd"))
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goto cleanup;
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n = send(clien, "t", 1, 0);
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if (!ASSERT_EQ(n, 1, "client send"))
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goto cleanup;
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/* Run iterator program that destroys sockets. */
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start_iter_sockets(skel->progs.iter_udp6_client);
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n = send(clien, "t", 1, 0);
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if (!ASSERT_LT(n, 0, "client_send on destroyed socket"))
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goto cleanup;
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/* UDP sockets have an overriding error code after they are disconnected,
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* so we don't check for ECONNABORTED error code.
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*/
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cleanup:
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if (clien != -1)
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close(clien);
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if (serv != -1)
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close(serv);
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}
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static void test_udp_server(struct sock_destroy_prog *skel)
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{
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int *listen_fds = NULL, n, i, serv_port;
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unsigned int num_listens = 5;
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char buf[1];
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/* Start reuseport servers. */
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listen_fds = start_reuseport_server(AF_INET6, SOCK_DGRAM,
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"::1", 0, 0, num_listens);
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if (!ASSERT_OK_PTR(listen_fds, "start_reuseport_server"))
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goto cleanup;
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serv_port = get_socket_local_port(listen_fds[0]);
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if (!ASSERT_GE(serv_port, 0, "get_sock_local_port"))
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goto cleanup;
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skel->bss->serv_port = (__be16) serv_port;
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/* Run iterator program that destroys server sockets. */
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start_iter_sockets(skel->progs.iter_udp6_server);
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for (i = 0; i < num_listens; ++i) {
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n = read(listen_fds[i], buf, sizeof(buf));
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if (!ASSERT_EQ(n, -1, "read") ||
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!ASSERT_EQ(errno, ECONNABORTED, "error code on destroyed socket"))
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break;
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}
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ASSERT_EQ(i, num_listens, "server socket");
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cleanup:
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free_fds(listen_fds, num_listens);
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}
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void test_sock_destroy(void)
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{
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struct sock_destroy_prog *skel;
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struct nstoken *nstoken = NULL;
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int cgroup_fd;
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skel = sock_destroy_prog__open_and_load();
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if (!ASSERT_OK_PTR(skel, "skel_open"))
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return;
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cgroup_fd = test__join_cgroup("/sock_destroy");
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if (!ASSERT_GE(cgroup_fd, 0, "join_cgroup"))
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goto cleanup;
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skel->links.sock_connect = bpf_program__attach_cgroup(
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skel->progs.sock_connect, cgroup_fd);
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if (!ASSERT_OK_PTR(skel->links.sock_connect, "prog_attach"))
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goto cleanup;
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SYS(cleanup, "ip netns add %s", TEST_NS);
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SYS(cleanup, "ip -net %s link set dev lo up", TEST_NS);
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nstoken = open_netns(TEST_NS);
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if (!ASSERT_OK_PTR(nstoken, "open_netns"))
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goto cleanup;
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if (test__start_subtest("tcp_client"))
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test_tcp_client(skel);
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if (test__start_subtest("tcp_server"))
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test_tcp_server(skel);
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if (test__start_subtest("udp_client"))
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test_udp_client(skel);
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if (test__start_subtest("udp_server"))
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test_udp_server(skel);
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RUN_TESTS(sock_destroy_prog_fail);
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cleanup:
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if (nstoken)
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close_netns(nstoken);
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SYS_NOFAIL("ip netns del " TEST_NS " &> /dev/null");
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if (cgroup_fd >= 0)
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close(cgroup_fd);
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sock_destroy_prog__destroy(skel);
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}
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