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// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2023 Isovalent */
#include <uapi/linux/if_link.h>
#include <test_progs.h>
#include <netinet/tcp.h>
#include <netinet/udp.h>
#include "network_helpers.h"
#include "test_assign_reuse.skel.h"
#define NS_TEST "assign_reuse"
#define LOOPBACK 1
#define PORT 4443
static int attach_reuseport(int sock_fd, int prog_fd)
{
return setsockopt(sock_fd, SOL_SOCKET, SO_ATTACH_REUSEPORT_EBPF,
&prog_fd, sizeof(prog_fd));
}
static __u64 cookie(int fd)
{
__u64 cookie = 0;
socklen_t cookie_len = sizeof(cookie);
int ret;
ret = getsockopt(fd, SOL_SOCKET, SO_COOKIE, &cookie, &cookie_len);
ASSERT_OK(ret, "cookie");
ASSERT_GT(cookie, 0, "cookie_invalid");
return cookie;
}
static int echo_test_udp(int fd_sv)
{
struct sockaddr_storage addr = {};
socklen_t len = sizeof(addr);
char buff[1] = {};
int fd_cl = -1, ret;
fd_cl = connect_to_fd(fd_sv, 100);
ASSERT_GT(fd_cl, 0, "create_client");
ASSERT_EQ(getsockname(fd_cl, (void *)&addr, &len), 0, "getsockname");
ASSERT_EQ(send(fd_cl, buff, sizeof(buff), 0), 1, "send_client");
ret = recv(fd_sv, buff, sizeof(buff), 0);
if (ret < 0) {
close(fd_cl);
return errno;
}
ASSERT_EQ(ret, 1, "recv_server");
ASSERT_EQ(sendto(fd_sv, buff, sizeof(buff), 0, (void *)&addr, len), 1, "send_server");
ASSERT_EQ(recv(fd_cl, buff, sizeof(buff), 0), 1, "recv_client");
close(fd_cl);
return 0;
}
static int echo_test_tcp(int fd_sv)
{
char buff[1] = {};
int fd_cl = -1, fd_sv_cl = -1;
fd_cl = connect_to_fd(fd_sv, 100);
if (fd_cl < 0)
return errno;
fd_sv_cl = accept(fd_sv, NULL, NULL);
ASSERT_GE(fd_sv_cl, 0, "accept_fd");
ASSERT_EQ(send(fd_cl, buff, sizeof(buff), 0), 1, "send_client");
ASSERT_EQ(recv(fd_sv_cl, buff, sizeof(buff), 0), 1, "recv_server");
ASSERT_EQ(send(fd_sv_cl, buff, sizeof(buff), 0), 1, "send_server");
ASSERT_EQ(recv(fd_cl, buff, sizeof(buff), 0), 1, "recv_client");
close(fd_sv_cl);
close(fd_cl);
return 0;
}
void run_assign_reuse(int family, int sotype, const char *ip, __u16 port)
{
DECLARE_LIBBPF_OPTS(bpf_tc_hook, tc_hook,
.ifindex = LOOPBACK,
.attach_point = BPF_TC_INGRESS,
);
DECLARE_LIBBPF_OPTS(bpf_tc_opts, tc_opts,
.handle = 1,
.priority = 1,
);
bool hook_created = false, tc_attached = false;
int ret, fd_tc, fd_accept, fd_drop, fd_map;
int *fd_sv = NULL;
__u64 fd_val;
struct test_assign_reuse *skel;
const int zero = 0;
skel = test_assign_reuse__open();
if (!ASSERT_OK_PTR(skel, "skel_open"))
goto cleanup;
skel->rodata->dest_port = port;
ret = test_assign_reuse__load(skel);
if (!ASSERT_OK(ret, "skel_load"))
goto cleanup;
ASSERT_EQ(skel->bss->sk_cookie_seen, 0, "cookie_init");
fd_tc = bpf_program__fd(skel->progs.tc_main);
fd_accept = bpf_program__fd(skel->progs.reuse_accept);
fd_drop = bpf_program__fd(skel->progs.reuse_drop);
fd_map = bpf_map__fd(skel->maps.sk_map);
fd_sv = start_reuseport_server(family, sotype, ip, port, 100, 1);
if (!ASSERT_NEQ(fd_sv, NULL, "start_reuseport_server"))
goto cleanup;
ret = attach_reuseport(*fd_sv, fd_drop);
if (!ASSERT_OK(ret, "attach_reuseport"))
goto cleanup;
fd_val = *fd_sv;
ret = bpf_map_update_elem(fd_map, &zero, &fd_val, BPF_NOEXIST);
if (!ASSERT_OK(ret, "bpf_sk_map"))
goto cleanup;
ret = bpf_tc_hook_create(&tc_hook);
if (ret == 0)
hook_created = true;
ret = ret == -EEXIST ? 0 : ret;
if (!ASSERT_OK(ret, "bpf_tc_hook_create"))
goto cleanup;
tc_opts.prog_fd = fd_tc;
ret = bpf_tc_attach(&tc_hook, &tc_opts);
if (!ASSERT_OK(ret, "bpf_tc_attach"))
goto cleanup;
tc_attached = true;
if (sotype == SOCK_STREAM)
ASSERT_EQ(echo_test_tcp(*fd_sv), ECONNREFUSED, "drop_tcp");
else
ASSERT_EQ(echo_test_udp(*fd_sv), EAGAIN, "drop_udp");
ASSERT_EQ(skel->bss->reuseport_executed, 1, "program executed once");
skel->bss->sk_cookie_seen = 0;
skel->bss->reuseport_executed = 0;
ASSERT_OK(attach_reuseport(*fd_sv, fd_accept), "attach_reuseport(accept)");
if (sotype == SOCK_STREAM)
ASSERT_EQ(echo_test_tcp(*fd_sv), 0, "echo_tcp");
else
ASSERT_EQ(echo_test_udp(*fd_sv), 0, "echo_udp");
ASSERT_EQ(skel->bss->sk_cookie_seen, cookie(*fd_sv),
"cookie_mismatch");
ASSERT_EQ(skel->bss->reuseport_executed, 1, "program executed once");
cleanup:
if (tc_attached) {
tc_opts.flags = tc_opts.prog_fd = tc_opts.prog_id = 0;
ret = bpf_tc_detach(&tc_hook, &tc_opts);
ASSERT_OK(ret, "bpf_tc_detach");
}
if (hook_created) {
tc_hook.attach_point = BPF_TC_INGRESS | BPF_TC_EGRESS;
bpf_tc_hook_destroy(&tc_hook);
}
test_assign_reuse__destroy(skel);
free_fds(fd_sv, 1);
}
void test_assign_reuse(void)
{
struct nstoken *tok = NULL;
SYS(out, "ip netns add %s", NS_TEST);
SYS(cleanup, "ip -net %s link set dev lo up", NS_TEST);
tok = open_netns(NS_TEST);
if (!ASSERT_OK_PTR(tok, "netns token"))
return;
if (test__start_subtest("tcpv4"))
run_assign_reuse(AF_INET, SOCK_STREAM, "127.0.0.1", PORT);
if (test__start_subtest("tcpv6"))
run_assign_reuse(AF_INET6, SOCK_STREAM, "::1", PORT);
if (test__start_subtest("udpv4"))
run_assign_reuse(AF_INET, SOCK_DGRAM, "127.0.0.1", PORT);
if (test__start_subtest("udpv6"))
run_assign_reuse(AF_INET6, SOCK_DGRAM, "::1", PORT);
cleanup:
close_netns(tok);
SYS_NOFAIL("ip netns delete %s", NS_TEST);
out:
return;
}
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