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/* SPDX-License-Identifier: GPL-2.0 */
#define _GNU_SOURCE
#include <errno.h>
#include <linux/err.h>
#include <net/if.h>
#include <pthread.h>
#include <stdbool.h>
#include <stdlib.h>
#include <string.h>
#include <sys/resource.h>
#include <unistd.h>
#include "test_utils.h"
#include <xdp/libxdp.h>
#include <bpf/libbpf.h>
# define ARRAY_SIZE(_x) (sizeof(_x) / sizeof((_x)[0]))
static bool kern_compat;
static struct xdp_program *load_prog(void)
{
DECLARE_LIBXDP_OPTS(xdp_program_opts, opts,
.prog_name = "xdp_pass",
.find_filename = "xdp-dispatcher.o",
);
return xdp_program__create(&opts);
}
static int check_attached_progs(int ifindex, int count, bool frags)
{
struct xdp_multiprog *mp;
int ret;
/* If the kernel does not support frags, we always expect
* frags support to be disabled on a returned dispatcher
*/
if (!kern_compat)
frags = false;
mp = xdp_multiprog__get_from_ifindex(ifindex);
ret = libxdp_get_error(mp);
if (ret) {
fprintf(stderr, "Couldn't get multiprog on ifindex %d: %s\n",
ifindex, strerror(-ret));
return ret;
}
ret = -EINVAL;
if (xdp_multiprog__is_legacy(mp)) {
fprintf(stderr, "Found legacy prog on ifindex %d\n", ifindex);
goto out;
}
if (xdp_multiprog__program_count(mp) != count) {
fprintf(stderr, "Expected %d programs loaded on ifindex %d, found %d\n",
count, ifindex, xdp_multiprog__program_count(mp));
goto out;
}
if (xdp_multiprog__xdp_frags_support(mp) != frags) {
fprintf(stderr,
"Multiprog on ifindex %d %s frags, expected %s\n",
ifindex,
xdp_multiprog__xdp_frags_support(mp) ?
"supports" :
"does not support",
frags ? "support" : "no support");
goto out;
}
ret = 0;
out:
xdp_multiprog__close(mp);
return ret;
}
static void print_test_result(const char *func, int ret)
{
fflush(stderr);
fprintf(stderr, "%s:\t%s\n", func, ret ? "FAILED" : "PASSED");
fflush(stdout);
}
static int load_attach_prog(struct xdp_program **prog, int ifindex, bool frags)
{
int ret;
*prog = load_prog();
if (!*prog) {
ret = -errno;
fprintf(stderr, "Couldn't load program: %s\n", strerror(-ret));
return ret;
}
ret = xdp_program__set_xdp_frags_support(*prog, frags);
if (ret)
return ret;
return xdp_program__attach(*prog, ifindex, XDP_MODE_NATIVE, 0);
}
static int _check_load(int ifindex, bool frags, bool should_succeed)
{
struct xdp_program *prog = NULL;
bool attached;
int ret;
ret = load_attach_prog(&prog, ifindex, frags);
attached = !ret;
if (attached != should_succeed) {
ret = -EINVAL;
goto out;
}
if (should_succeed)
ret = check_attached_progs(ifindex, 1, frags);
else
ret = 0;
out:
if (attached)
xdp_program__detach(prog, ifindex, XDP_MODE_NATIVE, 0);
xdp_program__close(prog);
return ret;
}
static int check_load_frags(int ifindex_bigmtu, int ifindex_smallmtu)
{
int ret = _check_load(ifindex_smallmtu, true, true);
if (!ret && ifindex_bigmtu)
_check_load(ifindex_bigmtu, true, true);
print_test_result(__func__, ret);
return ret;
}
static int check_load_nofrags_success(int ifindex)
{
int ret = _check_load(ifindex, false, true);
print_test_result(__func__, ret);
return ret;
}
static int check_load_nofrags_fail(int ifindex)
{
int ret = _check_load(ifindex, false, false);
print_test_result(__func__, ret);
return ret;
}
static int check_load_frags_multi(int ifindex)
{
struct xdp_program *prog1 = NULL, *prog2 = NULL;
int ret;
ret = load_attach_prog(&prog1, ifindex, true);
if (ret)
goto out;
ret = load_attach_prog(&prog2, ifindex, true);
if (ret)
goto out_prog1;
ret = check_attached_progs(ifindex, 2, true);
xdp_program__detach(prog2, ifindex, XDP_MODE_NATIVE, 0);
out_prog1:
xdp_program__detach(prog1, ifindex, XDP_MODE_NATIVE, 0);
out:
xdp_program__close(prog2);
xdp_program__close(prog1);
print_test_result(__func__, ret);
return ret;
}
static int check_load_mix_small(int ifindex)
{
struct xdp_program *prog1 = NULL, *prog2 = NULL;
int ret;
ret = load_attach_prog(&prog1, ifindex, true);
if (ret)
goto out;
/* First program attached, dispatcher supports frags */
ret = check_attached_progs(ifindex, 1, true);
if (ret)
goto out;
ret = load_attach_prog(&prog2, ifindex, false);
if (ret)
goto out_prog1;
/* Mixed program attachment, dispatcher should not support frags */
ret = check_attached_progs(ifindex, 2, false);
ret = xdp_program__detach(prog2, ifindex, XDP_MODE_NATIVE, 0) || ret;
if (ret)
goto out_prog1;
/* Second program removed, back to frags-only */
ret = check_attached_progs(ifindex, 1, true) || ret;
out_prog1:
xdp_program__detach(prog1, ifindex, XDP_MODE_NATIVE, 0);
out:
xdp_program__close(prog2);
xdp_program__close(prog1);
print_test_result(__func__, ret);
return ret;
}
static int check_load_mix_big(int ifindex)
{
struct xdp_program *prog1 = NULL, *prog2 = NULL;
int ret;
ret = load_attach_prog(&prog1, ifindex, true);
if (ret)
goto out;
/* First program attached, dispatcher supports frags */
ret = check_attached_progs(ifindex, 1, true);
if (ret)
goto out;
/* Second non-frags program should fail on big-MTU device */
ret = load_attach_prog(&prog2, ifindex, false);
if (!ret) {
xdp_program__detach(prog2, ifindex, XDP_MODE_NATIVE, 0);
ret = -EINVAL;
goto out_prog1;
}
/* Still only a single program loaded, with frags support */
ret = check_attached_progs(ifindex, 1, true);
out_prog1:
xdp_program__detach(prog1, ifindex, XDP_MODE_NATIVE, 0);
out:
xdp_program__close(prog2);
xdp_program__close(prog1);
print_test_result(__func__, ret);
return ret;
}
static bool check_frags_compat(void)
{
struct xdp_program *test_prog;
struct bpf_program *prog;
struct bpf_object *obj;
bool ret = false;
int err;
test_prog = load_prog();
if (!test_prog)
return false;
obj = xdp_program__bpf_obj(test_prog);
if (!obj)
goto out;
prog = bpf_object__find_program_by_name(obj, "xdp_pass");
if (!prog)
goto out;
bpf_program__set_flags(prog, BPF_F_XDP_HAS_FRAGS);
err = bpf_object__load(obj);
if (!err) {
printf("Kernel supports XDP programs with frags\n");
ret = true;
} else {
printf("Kernel DOES NOT support XDP programs with frags\n");
}
fflush(stdout);
out:
xdp_program__close(test_prog);
return ret;
}
static void usage(char *progname)
{
fprintf(stderr, "Usage: %s <ifname_bigmtu> <ifname_smallmtu>\n", progname);
exit(EXIT_FAILURE);
}
int main(int argc, char **argv)
{
struct rlimit r = {RLIM_INFINITY, RLIM_INFINITY};
int ifindex_bigmtu, ifindex_smallmtu, ret;
char *envval;
envval = secure_getenv("VERBOSE_TESTS");
silence_libbpf_logging();
if (envval && envval[0] == '1')
verbose_libxdp_logging();
else
silence_libxdp_logging();
kern_compat = check_frags_compat();
if (argc != 3)
usage(argv[0]);
ifindex_bigmtu = if_nametoindex(argv[1]);
ifindex_smallmtu = if_nametoindex(argv[2]);
if (!ifindex_bigmtu || !ifindex_smallmtu) {
fprintf(stderr, "Interface '%s' or '%s' not found.\n", argv[1], argv[2]);
usage(argv[0]);
}
if (setrlimit(RLIMIT_MEMLOCK, &r)) {
fprintf(stderr, "ERROR: setrlimit(RLIMIT_MEMLOCK) \"%s\"\n",
strerror(errno));
exit(EXIT_FAILURE);
}
ret = check_load_frags(kern_compat ? ifindex_bigmtu : 0, ifindex_smallmtu);
ret = check_load_nofrags_success(ifindex_smallmtu) || ret;
if (kern_compat) {
ret = check_load_nofrags_fail(ifindex_bigmtu) || ret;
ret = check_load_frags_multi(ifindex_bigmtu) || ret;
ret = check_load_mix_big(ifindex_bigmtu) || ret;
}
ret = check_load_mix_small(ifindex_smallmtu) || ret;
return ret;
}
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