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// 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);
}
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