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// SPDX-License-Identifier: GPL-2.0
#include <test_progs.h>
#include "cgroup_helpers.h"
#define PING_CMD "ping -q -c1 -w1 127.0.0.1 > /dev/null"
char bpf_log_buf[BPF_LOG_BUF_SIZE];
static int prog_load(void)
{
struct bpf_insn prog[] = {
BPF_MOV64_IMM(BPF_REG_0, 1), /* r0 = 1 */
BPF_EXIT_INSN(),
};
size_t insns_cnt = sizeof(prog) / sizeof(struct bpf_insn);
return bpf_load_program(BPF_PROG_TYPE_CGROUP_SKB,
prog, insns_cnt, "GPL", 0,
bpf_log_buf, BPF_LOG_BUF_SIZE);
}
void test_cgroup_attach_autodetach(void)
{
__u32 duration = 0, prog_cnt = 4, attach_flags;
int allow_prog[2] = {-1};
__u32 prog_ids[2] = {0};
void *ptr = NULL;
int cg = 0, i;
int attempts;
for (i = 0; i < ARRAY_SIZE(allow_prog); i++) {
allow_prog[i] = prog_load();
if (CHECK(allow_prog[i] < 0, "prog_load",
"verifier output:\n%s\n-------\n", bpf_log_buf))
goto err;
}
if (CHECK_FAIL(setup_cgroup_environment()))
goto err;
/* create a cgroup, attach two programs and remember their ids */
cg = create_and_get_cgroup("/cg_autodetach");
if (CHECK_FAIL(cg < 0))
goto err;
if (CHECK_FAIL(join_cgroup("/cg_autodetach")))
goto err;
for (i = 0; i < ARRAY_SIZE(allow_prog); i++)
if (CHECK(bpf_prog_attach(allow_prog[i], cg,
BPF_CGROUP_INET_EGRESS,
BPF_F_ALLOW_MULTI),
"prog_attach", "prog[%d], errno=%d\n", i, errno))
goto err;
/* make sure that programs are attached and run some traffic */
if (CHECK(bpf_prog_query(cg, BPF_CGROUP_INET_EGRESS, 0, &attach_flags,
prog_ids, &prog_cnt),
"prog_query", "errno=%d\n", errno))
goto err;
if (CHECK_FAIL(system(PING_CMD)))
goto err;
/* allocate some memory (4Mb) to pin the original cgroup */
ptr = malloc(4 * (1 << 20));
if (CHECK_FAIL(!ptr))
goto err;
/* close programs and cgroup fd */
for (i = 0; i < ARRAY_SIZE(allow_prog); i++) {
close(allow_prog[i]);
allow_prog[i] = -1;
}
close(cg);
cg = 0;
/* leave the cgroup and remove it. don't detach programs */
cleanup_cgroup_environment();
/* wait for the asynchronous auto-detachment.
* wait for no more than 5 sec and give up.
*/
for (i = 0; i < ARRAY_SIZE(prog_ids); i++) {
for (attempts = 5; attempts >= 0; attempts--) {
int fd = bpf_prog_get_fd_by_id(prog_ids[i]);
if (fd < 0)
break;
/* don't leave the fd open */
close(fd);
if (CHECK_FAIL(!attempts))
goto err;
sleep(1);
}
}
err:
for (i = 0; i < ARRAY_SIZE(allow_prog); i++)
if (allow_prog[i] >= 0)
close(allow_prog[i]);
if (cg)
close(cg);
free(ptr);
cleanup_cgroup_environment();
}
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