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