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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 <sys/stat.h>
#include <unistd.h>
#include "test_utils.h"
#include "../libxdp_internal.h"
#include "xdp_dispatcher_v1.h"
#include <xdp/libxdp.h>
#include <bpf/libbpf.h>
#include <bpf/btf.h>
#ifndef PATH_MAX
#define PATH_MAX 4096
#endif
#define BPFFS_DIR "/sys/fs/bpf/xdp"
#define PROG_RUN_PRIO 42
#define PROG_CHAIN_CALL_ACTIONS (1 << XDP_DROP)
int get_prog_id(int prog_fd)
{
struct bpf_prog_info info = {};
__u32 len = sizeof(info);
int err;
err = bpf_obj_get_info_by_fd(prog_fd, &info, &len);
if (err)
return -errno;
return info.id;
}
int load_dispatcher_v1(int ifindex)
{
struct xdp_dispatcher_config_v1 dispatcher_config = {};
struct bpf_object *obj_dispatcher, *obj_prog = NULL;
DECLARE_LIBBPF_OPTS(bpf_link_create_opts, opts);
struct bpf_program *dispatcher_prog, *xdp_prog;
int ret, btf_id, lfd = -1, dispatcher_id;
char pin_path[PATH_MAX], buf[PATH_MAX];
const char *attach_func = "prog0";
struct bpf_map *map;
if (!ifindex)
return -ENOENT;
obj_dispatcher = bpf_object__open("xdp_dispatcher_v1.o");
if (!obj_dispatcher)
return -errno;
btf_id = btf__find_by_name_kind(bpf_object__btf(obj_dispatcher),
attach_func, BTF_KIND_FUNC);
if (btf_id <= 0) {
ret = -ENOENT;
goto out;
}
opts.target_btf_id = btf_id;
map = bpf_object__next_map(obj_dispatcher, NULL);
if (!map) {
ret = -ENOENT;
goto out;
}
dispatcher_prog = bpf_object__find_program_by_name(obj_dispatcher,
"xdp_dispatcher");
if (!dispatcher_prog) {
ret = -errno;
goto out;
}
dispatcher_config.num_progs_enabled = 1;
dispatcher_config.chain_call_actions[0] = PROG_CHAIN_CALL_ACTIONS;
dispatcher_config.run_prios[0] = PROG_RUN_PRIO;
ret = bpf_map__set_initial_value(map, &dispatcher_config,
sizeof(dispatcher_config));
if (ret)
goto out;
ret = bpf_object__load(obj_dispatcher);
if (ret)
goto out;
dispatcher_id = get_prog_id(bpf_program__fd(dispatcher_prog));
if (dispatcher_id < 0) {
ret = dispatcher_id;
goto out;
}
obj_prog = bpf_object__open("xdp_pass.o");
if (!obj_prog) {
ret = -errno;
goto out;
}
xdp_prog = bpf_object__find_program_by_name(obj_prog, "xdp_pass");
if (!xdp_prog) {
ret = -errno;
goto out;
}
ret = bpf_program__set_attach_target(xdp_prog,
bpf_program__fd(dispatcher_prog),
attach_func);
if (ret)
goto out;
bpf_program__set_type(xdp_prog, BPF_PROG_TYPE_EXT);
bpf_program__set_expected_attach_type(xdp_prog, 0);
ret = bpf_object__load(obj_prog);
if (ret)
goto out;
lfd = bpf_link_create(bpf_program__fd(xdp_prog),
bpf_program__fd(dispatcher_prog), 0, &opts);
if (lfd < 0) {
ret = -errno;
goto out;
}
ret = try_snprintf(pin_path, sizeof(pin_path), "%s/dispatch-%d-%d",
BPFFS_DIR, ifindex, dispatcher_id);
if (ret)
goto out;
ret = mkdir(BPFFS_DIR, S_IRWXU);
if (ret && errno != EEXIST) {
ret = -errno;
printf("mkdir err (%s): %s\n", BPFFS_DIR, strerror(-ret));
goto out;
}
ret = mkdir(pin_path, S_IRWXU);
if (ret) {
ret = -errno;
printf("mkdir err (%s): %s\n", pin_path, strerror(-ret));
goto out;
}
ret = try_snprintf(buf, sizeof(buf), "%s/prog0-link", pin_path);
if (ret)
goto err_unpin;
ret = bpf_obj_pin(lfd, buf);
if (ret)
goto err_unpin;
ret = try_snprintf(buf, sizeof(buf), "%s/prog0-prog", pin_path);
if (ret)
goto err_unpin;
ret = bpf_obj_pin(bpf_program__fd(xdp_prog), buf);
if (ret)
goto err_unpin;
ret = xdp_attach_fd(bpf_program__fd(dispatcher_prog), -1, ifindex,
XDP_MODE_NATIVE);
if (ret)
goto err_unpin;
out:
if (lfd >= 0)
close(lfd);
bpf_object__close(obj_dispatcher);
bpf_object__close(obj_prog);
return ret;
err_unpin:
if (!try_snprintf(buf, sizeof(buf), "%s/prog0-link", pin_path))
unlink(buf);
if (!try_snprintf(buf, sizeof(buf), "%s/prog0-prog", pin_path))
unlink(buf);
rmdir(pin_path);
goto out;
}
int check_old_dispatcher(int ifindex)
{
struct xdp_multiprog *mp = NULL;
struct xdp_program *xdp_prog;
char buf[100];
int ret;
ret = load_dispatcher_v1(ifindex);
if (ret)
goto out;
mp = xdp_multiprog__get_from_ifindex(ifindex);
ret = libxdp_get_error(mp);
if (ret)
goto out;
if (xdp_multiprog__is_legacy(mp)) {
printf("Got unexpected legacy multiprog\n");
ret = -EINVAL;
goto out;
}
if (xdp_multiprog__program_count(mp) != 1) {
printf("Expected 1 attached program, got %d\n",
xdp_multiprog__program_count(mp));
ret = -EINVAL;
goto out;
}
xdp_prog = xdp_multiprog__next_prog(NULL, mp);
if (!xdp_prog) {
ret = -errno;
goto out;
}
if (strcmp(xdp_program__name(xdp_prog), "xdp_pass")) {
printf("Expected xdp_pass program, got %s\n",
xdp_program__name(xdp_prog));
ret = -EINVAL;
goto out;
}
if (xdp_program__run_prio(xdp_prog) != PROG_RUN_PRIO) {
printf("Expected run prio %d got %d\n", PROG_RUN_PRIO,
xdp_program__run_prio(xdp_prog));
ret = -EINVAL;
goto out;
}
ret = xdp_program__print_chain_call_actions(xdp_prog, buf, sizeof(buf));
if (ret)
goto out;
if (strcmp(buf, "XDP_DROP")) {
printf("Expected actions XDP_PASS, got %s\n", buf);
ret = -EINVAL;
goto out;
}
xdp_prog = xdp_program__open_file("xdp_pass.o", "xdp", NULL);
ret = libxdp_get_error(xdp_prog);
if (ret)
goto out;
ret = xdp_program__attach(xdp_prog, ifindex, XDP_MODE_NATIVE, 0);
xdp_program__close(xdp_prog);
if (!ret) {
printf("Shouldn't have been able to attach a new program to ifindex!\n");
ret = -EINVAL;
goto out;
}
ret = 0;
out:
if (mp)
xdp_multiprog__detach(mp);
xdp_multiprog__close(mp);
return ret;
}
static void usage(char *progname)
{
fprintf(stderr, "Usage: %s <ifname>\n", progname);
exit(EXIT_FAILURE);
}
int main(int argc, char **argv)
{
int ifindex, ret;
char *envval;
envval = secure_getenv("VERBOSE_TESTS");
silence_libbpf_logging();
if (envval && envval[0] == '1')
verbose_libxdp_logging();
else
silence_libxdp_logging();
if (argc != 2)
usage(argv[0]);
ifindex = if_nametoindex(argv[1]);
ret = check_old_dispatcher(ifindex);
return ret;
}
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