| // 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" |
| |
| static 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 serial_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(); |
| } |