// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2019 Facebook */
#include <linux/err.h>
#include <netinet/tcp.h>
#include <test_progs.h>
#include "network_helpers.h"
#include "bpf_dctcp.skel.h"
#include "bpf_cubic.skel.h"
#include "bpf_tcp_nogpl.skel.h"
#include "tcp_ca_update.skel.h"
#include "bpf_dctcp_release.skel.h"
#include "tcp_ca_write_sk_pacing.skel.h"
#include "tcp_ca_incompl_cong_ops.skel.h"
#include "tcp_ca_unsupp_cong_op.skel.h"
#include "tcp_ca_kfunc.skel.h"
#include "bpf_cc_cubic.skel.h"
#ifndef ENOTSUPP
#define ENOTSUPP 524
#endif
static const unsigned int total_bytes = 10 * 1024 * 1024;
static int expected_stg = 0xeB9F;
struct cb_opts {
const char *cc;
int map_fd;
};
static int settcpca(int fd, const char *tcp_ca)
{
int err;
err = setsockopt(fd, IPPROTO_TCP, TCP_CONGESTION, tcp_ca, strlen(tcp_ca));
if (!ASSERT_NEQ(err, -1, "setsockopt"))
return -1;
return 0;
}
static bool start_test(char *addr_str,
const struct network_helper_opts *srv_opts,
const struct network_helper_opts *cli_opts,
int *srv_fd, int *cli_fd)
{
*srv_fd = start_server_str(AF_INET6, SOCK_STREAM, addr_str, 0, srv_opts);
if (!ASSERT_NEQ(*srv_fd, -1, "start_server_str"))
goto err;
/* connect to server */
*cli_fd = connect_to_fd_opts(*srv_fd, SOCK_STREAM, cli_opts);
if (!ASSERT_NEQ(*cli_fd, -1, "connect_to_fd_opts"))
goto err;
return true;
err:
if (*srv_fd != -1) {
close(*srv_fd);
*srv_fd = -1;
}
if (*cli_fd != -1) {
close(*cli_fd);
*cli_fd = -1;
}
return false;
}
static void do_test(const struct network_helper_opts *opts)
{
int lfd = -1, fd = -1;
if (!start_test(NULL, opts, opts, &lfd, &fd))
goto done;
ASSERT_OK(send_recv_data(lfd, fd, total_bytes), "send_recv_data");
done:
if (lfd != -1)
close(lfd);
if (fd != -1)
close(fd);
}
static int cc_cb(int fd, void *opts)
{
struct cb_opts *cb_opts = (struct cb_opts *)opts;
return settcpca(fd, cb_opts->cc);
}
static void test_cubic(void)
{
struct cb_opts cb_opts = {
.cc = "bpf_cubic",
};
struct network_helper_opts opts = {
.post_socket_cb = cc_cb,
.cb_opts = &cb_opts,
};
struct bpf_cubic *cubic_skel;
struct bpf_link *link;
cubic_skel = bpf_cubic__open_and_load();
if (!ASSERT_OK_PTR(cubic_skel, "bpf_cubic__open_and_load"))
return;
link = bpf_map__attach_struct_ops(cubic_skel->maps.cubic);
if (!ASSERT_OK_PTR(link, "bpf_map__attach_struct_ops")) {
bpf_cubic__destroy(cubic_skel);
return;
}
do_test(&opts);
ASSERT_EQ(cubic_skel->bss->bpf_cubic_acked_called, 1, "pkts_acked called");
bpf_link__destroy(link);
bpf_cubic__destroy(cubic_skel);
}
static int stg_post_socket_cb(int fd, void *opts)
{
struct cb_opts *cb_opts = (struct cb_opts *)opts;
int err;
err = settcpca(fd, cb_opts->cc);
if (err)
return err;
err = bpf_map_update_elem(cb_opts->map_fd, &fd,
&expected_stg, BPF_NOEXIST);
if (!ASSERT_OK(err, "bpf_map_update_elem(sk_stg_map)"))
return err;
return 0;
}
static void test_dctcp(void)
{
struct cb_opts cb_opts = {
.cc = "bpf_dctcp",
};
struct network_helper_opts opts = {
.post_socket_cb = cc_cb,
.cb_opts = &cb_opts,
};
struct network_helper_opts cli_opts = {
.post_socket_cb = stg_post_socket_cb,
.cb_opts = &cb_opts,
};
int lfd = -1, fd = -1, tmp_stg, err;
struct bpf_dctcp *dctcp_skel;
struct bpf_link *link;
dctcp_skel = bpf_dctcp__open_and_load();
if (!ASSERT_OK_PTR(dctcp_skel, "bpf_dctcp__open_and_load"))
return;
link = bpf_map__attach_struct_ops(dctcp_skel->maps.dctcp);
if (!ASSERT_OK_PTR(link, "bpf_map__attach_struct_ops")) {
bpf_dctcp__destroy(dctcp_skel);
return;
}
cb_opts.map_fd = bpf_map__fd(dctcp_skel->maps.sk_stg_map);
if (!start_test(NULL, &opts, &cli_opts, &lfd, &fd))
goto done;
err = bpf_map_lookup_elem(cb_opts.map_fd, &fd, &tmp_stg);
if (!ASSERT_ERR(err, "bpf_map_lookup_elem(sk_stg_map)") ||
!ASSERT_EQ(errno, ENOENT, "bpf_map_lookup_elem(sk_stg_map)"))
goto done;
ASSERT_OK(send_recv_data(lfd, fd, total_bytes), "send_recv_data");
ASSERT_EQ(dctcp_skel->bss->stg_result, expected_stg, "stg_result");
done:
bpf_link__destroy(link);
bpf_dctcp__destroy(dctcp_skel);
if (lfd != -1)
close(lfd);
if (fd != -1)
close(fd);
}
static void test_dctcp_autoattach_map(void)
{
struct cb_opts cb_opts = {
.cc = "bpf_dctcp",
};
struct network_helper_opts opts = {
.post_socket_cb = cc_cb,
.cb_opts = &cb_opts,
};
struct bpf_dctcp *dctcp_skel;
struct bpf_link *link;
dctcp_skel = bpf_dctcp__open_and_load();
if (!ASSERT_OK_PTR(dctcp_skel, "bpf_dctcp__open_and_load"))
return;
bpf_map__set_autoattach(dctcp_skel->maps.dctcp, true);
bpf_map__set_autoattach(dctcp_skel->maps.dctcp_nouse, false);
if (!ASSERT_OK(bpf_dctcp__attach(dctcp_skel), "bpf_dctcp__attach"))
goto destroy;
/* struct_ops is auto-attached */
link = dctcp_skel->links.dctcp;
if (!ASSERT_OK_PTR(link, "link"))
goto destroy;
do_test(&opts);
destroy:
bpf_dctcp__destroy(dctcp_skel);
}
static char *err_str;
static bool found;
static int libbpf_debug_print(enum libbpf_print_level level,
const char *format, va_list args)
{
const char *prog_name, *log_buf;
if (level != LIBBPF_WARN ||
!strstr(format, "-- BEGIN PROG LOAD LOG --")) {
vprintf(format, args);
return 0;
}
prog_name = va_arg(args, char *);
log_buf = va_arg(args, char *);
if (!log_buf)
goto out;
if (err_str && strstr(log_buf, err_str) != NULL)
found = true;
out:
printf(format, prog_name, log_buf);
return 0;
}
static void test_invalid_license(void)
{
libbpf_print_fn_t old_print_fn;
struct bpf_tcp_nogpl *skel;
err_str = "struct ops programs must have a GPL compatible license";
found = false;
old_print_fn = libbpf_set_print(libbpf_debug_print);
skel = bpf_tcp_nogpl__open_and_load();
ASSERT_NULL(skel, "bpf_tcp_nogpl");
ASSERT_EQ(found, true, "expected_err_msg");
bpf_tcp_nogpl__destroy(skel);
libbpf_set_print(old_print_fn);
}
static void test_dctcp_fallback(void)
{
int err, lfd = -1, cli_fd = -1, srv_fd = -1;
struct bpf_dctcp *dctcp_skel;
struct bpf_link *link = NULL;
struct cb_opts dctcp = {
.cc = "bpf_dctcp",
};
struct network_helper_opts srv_opts = {
.post_socket_cb = cc_cb,
.cb_opts = &dctcp,
};
struct cb_opts cubic = {
.cc = "cubic",
};
struct network_helper_opts cli_opts = {
.post_socket_cb = cc_cb,
.cb_opts = &cubic,
};
char srv_cc[16];
socklen_t cc_len = sizeof(srv_cc);
dctcp_skel = bpf_dctcp__open();
if (!ASSERT_OK_PTR(dctcp_skel, "dctcp_skel"))
return;
strcpy(dctcp_skel->rodata->fallback, "cubic");
if (!ASSERT_OK(bpf_dctcp__load(dctcp_skel), "bpf_dctcp__load"))
goto done;
link = bpf_map__attach_struct_ops(dctcp_skel->maps.dctcp);
if (!ASSERT_OK_PTR(link, "dctcp link"))
goto done;
if (!start_test("::1", &srv_opts, &cli_opts, &lfd, &cli_fd))
goto done;
srv_fd = accept(lfd, NULL, 0);
if (!ASSERT_GE(srv_fd, 0, "srv_fd"))
goto done;
ASSERT_STREQ(dctcp_skel->bss->cc_res, "cubic", "cc_res");
ASSERT_EQ(dctcp_skel->bss->tcp_cdg_res, -ENOTSUPP, "tcp_cdg_res");
/* All setsockopt(TCP_CONGESTION) in the recurred
* bpf_dctcp->init() should fail with -EBUSY.
*/
ASSERT_EQ(dctcp_skel->bss->ebusy_cnt, 3, "ebusy_cnt");
err = getsockopt(srv_fd, SOL_TCP, TCP_CONGESTION, srv_cc, &cc_len);
if (!ASSERT_OK(err, "getsockopt(srv_fd, TCP_CONGESTION)"))
goto done;
ASSERT_STREQ(srv_cc, "cubic", "srv_fd cc");
done:
bpf_link__destroy(link);
bpf_dctcp__destroy(dctcp_skel);
if (lfd != -1)
close(lfd);
if (srv_fd != -1)
close(srv_fd);
if (cli_fd != -1)
close(cli_fd);
}
static void test_rel_setsockopt(void)
{
struct bpf_dctcp_release *rel_skel;
libbpf_print_fn_t old_print_fn;
err_str = "program of this type cannot use helper bpf_setsockopt";
found = false;
old_print_fn = libbpf_set_print(libbpf_debug_print);
rel_skel = bpf_dctcp_release__open_and_load();
libbpf_set_print(old_print_fn);
ASSERT_ERR_PTR(rel_skel, "rel_skel");
ASSERT_TRUE(found, "expected_err_msg");
bpf_dctcp_release__destroy(rel_skel);
}
static void test_write_sk_pacing(void)
{
struct tcp_ca_write_sk_pacing *skel;
struct bpf_link *link;
skel = tcp_ca_write_sk_pacing__open_and_load();
if (!ASSERT_OK_PTR(skel, "open_and_load"))
return;
link = bpf_map__attach_struct_ops(skel->maps.write_sk_pacing);
ASSERT_OK_PTR(link, "attach_struct_ops");
bpf_link__destroy(link);
tcp_ca_write_sk_pacing__destroy(skel);
}
static void test_incompl_cong_ops(void)
{
struct tcp_ca_incompl_cong_ops *skel;
struct bpf_link *link;
skel = tcp_ca_incompl_cong_ops__open_and_load();
if (!ASSERT_OK_PTR(skel, "open_and_load"))
return;
/* That cong_avoid() and cong_control() are missing is only reported at
* this point:
*/
link = bpf_map__attach_struct_ops(skel->maps.incompl_cong_ops);
ASSERT_ERR_PTR(link, "attach_struct_ops");
bpf_link__destroy(link);
tcp_ca_incompl_cong_ops__destroy(skel);
}
static void test_unsupp_cong_op(void)
{
libbpf_print_fn_t old_print_fn;
struct tcp_ca_unsupp_cong_op *skel;
err_str = "attach to unsupported member get_info";
found = false;
old_print_fn = libbpf_set_print(libbpf_debug_print);
skel = tcp_ca_unsupp_cong_op__open_and_load();
ASSERT_NULL(skel, "open_and_load");
ASSERT_EQ(found, true, "expected_err_msg");
tcp_ca_unsupp_cong_op__destroy(skel);
libbpf_set_print(old_print_fn);
}
static void test_update_ca(void)
{
struct cb_opts cb_opts = {
.cc = "tcp_ca_update",
};
struct network_helper_opts opts = {
.post_socket_cb = cc_cb,
.cb_opts = &cb_opts,
};
struct tcp_ca_update *skel;
struct bpf_link *link;
int saved_ca1_cnt;
int err;
skel = tcp_ca_update__open_and_load();
if (!ASSERT_OK_PTR(skel, "open"))
return;
link = bpf_map__attach_struct_ops(skel->maps.ca_update_1);
if (!ASSERT_OK_PTR(link, "attach_struct_ops"))
goto out;
do_test(&opts);
saved_ca1_cnt = skel->bss->ca1_cnt;
ASSERT_GT(saved_ca1_cnt, 0, "ca1_ca1_cnt");
err = bpf_link__update_map(link, skel->maps.ca_update_2);
ASSERT_OK(err, "update_map");
do_test(&opts);
ASSERT_EQ(skel->bss->ca1_cnt, saved_ca1_cnt, "ca2_ca1_cnt");
ASSERT_GT(skel->bss->ca2_cnt, 0, "ca2_ca2_cnt");
bpf_link__destroy(link);
out:
tcp_ca_update__destroy(skel);
}
static void test_update_wrong(void)
{
struct cb_opts cb_opts = {
.cc = "tcp_ca_update",
};
struct network_helper_opts opts = {
.post_socket_cb = cc_cb,
.cb_opts = &cb_opts,
};
struct tcp_ca_update *skel;
struct bpf_link *link;
int saved_ca1_cnt;
int err;
skel = tcp_ca_update__open_and_load();
if (!ASSERT_OK_PTR(skel, "open"))
return;
link = bpf_map__attach_struct_ops(skel->maps.ca_update_1);
if (!ASSERT_OK_PTR(link, "attach_struct_ops"))
goto out;
do_test(&opts);
saved_ca1_cnt = skel->bss->ca1_cnt;
ASSERT_GT(saved_ca1_cnt, 0, "ca1_ca1_cnt");
err = bpf_link__update_map(link, skel->maps.ca_wrong);
ASSERT_ERR(err, "update_map");
do_test(&opts);
ASSERT_GT(skel->bss->ca1_cnt, saved_ca1_cnt, "ca2_ca1_cnt");
bpf_link__destroy(link);
out:
tcp_ca_update__destroy(skel);
}
static void test_mixed_links(void)
{
struct cb_opts cb_opts = {
.cc = "tcp_ca_update",
};
struct network_helper_opts opts = {
.post_socket_cb = cc_cb,
.cb_opts = &cb_opts,
};
struct tcp_ca_update *skel;
struct bpf_link *link, *link_nl;
int err;
skel = tcp_ca_update__open_and_load();
if (!ASSERT_OK_PTR(skel, "open"))
return;
link_nl = bpf_map__attach_struct_ops(skel->maps.ca_no_link);
if (!ASSERT_OK_PTR(link_nl, "attach_struct_ops_nl"))
goto out;
link = bpf_map__attach_struct_ops(skel->maps.ca_update_1);
ASSERT_OK_PTR(link, "attach_struct_ops");
do_test(&opts);
ASSERT_GT(skel->bss->ca1_cnt, 0, "ca1_ca1_cnt");
err = bpf_link__update_map(link, skel->maps.ca_no_link);
ASSERT_ERR(err, "update_map");
bpf_link__destroy(link);
bpf_link__destroy(link_nl);
out:
tcp_ca_update__destroy(skel);
}
static void test_multi_links(void)
{
struct tcp_ca_update *skel;
struct bpf_link *link;
skel = tcp_ca_update__open_and_load();
if (!ASSERT_OK_PTR(skel, "open"))
return;
link = bpf_map__attach_struct_ops(skel->maps.ca_update_1);
ASSERT_OK_PTR(link, "attach_struct_ops_1st");
bpf_link__destroy(link);
/* A map should be able to be used to create links multiple
* times.
*/
link = bpf_map__attach_struct_ops(skel->maps.ca_update_1);
ASSERT_OK_PTR(link, "attach_struct_ops_2nd");
bpf_link__destroy(link);
tcp_ca_update__destroy(skel);
}
static void test_link_replace(void)
{
DECLARE_LIBBPF_OPTS(bpf_link_update_opts, opts);
struct tcp_ca_update *skel;
struct bpf_link *link;
int err;
skel = tcp_ca_update__open_and_load();
if (!ASSERT_OK_PTR(skel, "open"))
return;
link = bpf_map__attach_struct_ops(skel->maps.ca_update_1);
ASSERT_OK_PTR(link, "attach_struct_ops_1st");
bpf_link__destroy(link);
link = bpf_map__attach_struct_ops(skel->maps.ca_update_2);
if (!ASSERT_OK_PTR(link, "attach_struct_ops_2nd"))
goto out;
/* BPF_F_REPLACE with a wrong old map Fd. It should fail!
*
* With BPF_F_REPLACE, the link should be updated only if the
* old map fd given here matches the map backing the link.
*/
opts.old_map_fd = bpf_map__fd(skel->maps.ca_update_1);
opts.flags = BPF_F_REPLACE;
err = bpf_link_update(bpf_link__fd(link),
bpf_map__fd(skel->maps.ca_update_1),
&opts);
ASSERT_ERR(err, "bpf_link_update_fail");
/* BPF_F_REPLACE with a correct old map Fd. It should success! */
opts.old_map_fd = bpf_map__fd(skel->maps.ca_update_2);
err = bpf_link_update(bpf_link__fd(link),
bpf_map__fd(skel->maps.ca_update_1),
&opts);
ASSERT_OK(err, "bpf_link_update_success");
bpf_link__destroy(link);
out:
tcp_ca_update__destroy(skel);
}
static void test_tcp_ca_kfunc(void)
{
struct tcp_ca_kfunc *skel;
skel = tcp_ca_kfunc__open_and_load();
ASSERT_OK_PTR(skel, "tcp_ca_kfunc__open_and_load");
tcp_ca_kfunc__destroy(skel);
}
static void test_cc_cubic(void)
{
struct cb_opts cb_opts = {
.cc = "bpf_cc_cubic",
};
struct network_helper_opts opts = {
.post_socket_cb = cc_cb,
.cb_opts = &cb_opts,
};
struct bpf_cc_cubic *cc_cubic_skel;
struct bpf_link *link;
cc_cubic_skel = bpf_cc_cubic__open_and_load();
if (!ASSERT_OK_PTR(cc_cubic_skel, "bpf_cc_cubic__open_and_load"))
return;
link = bpf_map__attach_struct_ops(cc_cubic_skel->maps.cc_cubic);
if (!ASSERT_OK_PTR(link, "bpf_map__attach_struct_ops")) {
bpf_cc_cubic__destroy(cc_cubic_skel);
return;
}
do_test(&opts);
bpf_link__destroy(link);
bpf_cc_cubic__destroy(cc_cubic_skel);
}
void test_bpf_tcp_ca(void)
{
if (test__start_subtest("dctcp"))
test_dctcp();
if (test__start_subtest("cubic"))
test_cubic();
if (test__start_subtest("invalid_license"))
test_invalid_license();
if (test__start_subtest("dctcp_fallback"))
test_dctcp_fallback();
if (test__start_subtest("rel_setsockopt"))
test_rel_setsockopt();
if (test__start_subtest("write_sk_pacing"))
test_write_sk_pacing();
if (test__start_subtest("incompl_cong_ops"))
test_incompl_cong_ops();
if (test__start_subtest("unsupp_cong_op"))
test_unsupp_cong_op();
if (test__start_subtest("update_ca"))
test_update_ca();
if (test__start_subtest("update_wrong"))
test_update_wrong();
if (test__start_subtest("mixed_links"))
test_mixed_links();
if (test__start_subtest("multi_links"))
test_multi_links();
if (test__start_subtest("link_replace"))
test_link_replace();
if (test__start_subtest("tcp_ca_kfunc"))
test_tcp_ca_kfunc();
if (test__start_subtest("cc_cubic"))
test_cc_cubic();
if (test__start_subtest("dctcp_autoattach_map"))
test_dctcp_autoattach_map();
}
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