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