bpf/prog_tests/cgroup_attach_autodetach.c

0001 // SPDX-License-Identifier: GPL-2.0
0002
0003 #include <test_progs.h>
0004
0005 #include "cgroup_helpers.h"
0006
0007 #define PING_CMD    "ping -q -c1 -w1 127.0.0.1 > /dev/null"
0008
0009 static char bpf_log_buf[BPF_LOG_BUF_SIZE];
0010
0011 static int prog_load(void)
0012 {
0013     struct bpf_insn prog[] = {
0014         BPF_MOV64_IMM(BPF_REG_0, 1), /* r0 = 1 */
0015         BPF_EXIT_INSN(),
0016     };
0017     size_t insns_cnt = ARRAY_SIZE(prog);
0018
0019     return bpf_test_load_program(BPF_PROG_TYPE_CGROUP_SKB,
0020                    prog, insns_cnt, "GPL", 0,
0021                    bpf_log_buf, BPF_LOG_BUF_SIZE);
0022 }
0023
0024 void serial_test_cgroup_attach_autodetach(void)
0025 {
0026     __u32 duration = 0, prog_cnt = 4, attach_flags;
0027     int allow_prog[2] = {-1};
0028     __u32 prog_ids[2] = {0};
0029     void *ptr = NULL;
0030     int cg = 0, i;
0031     int attempts;
0032
0033     for (i = 0; i < ARRAY_SIZE(allow_prog); i++) {
0034         allow_prog[i] = prog_load();
0035         if (CHECK(allow_prog[i] < 0, "prog_load",
0036               "verifier output:\n%s\n-------\n", bpf_log_buf))
0037             goto err;
0038     }
0039
0040     if (CHECK_FAIL(setup_cgroup_environment()))
0041         goto err;
0042
0043     /* create a cgroup, attach two programs and remember their ids */
0044     cg = create_and_get_cgroup("/cg_autodetach");
0045     if (CHECK_FAIL(cg < 0))
0046         goto err;
0047
0048     if (CHECK_FAIL(join_cgroup("/cg_autodetach")))
0049         goto err;
0050
0051     for (i = 0; i < ARRAY_SIZE(allow_prog); i++)
0052         if (CHECK(bpf_prog_attach(allow_prog[i], cg,
0053                       BPF_CGROUP_INET_EGRESS,
0054                       BPF_F_ALLOW_MULTI),
0055               "prog_attach", "prog[%d], errno=%d\n", i, errno))
0056             goto err;
0057
0058     /* make sure that programs are attached and run some traffic */
0059     if (CHECK(bpf_prog_query(cg, BPF_CGROUP_INET_EGRESS, 0, &attach_flags,
0060                  prog_ids, &prog_cnt),
0061           "prog_query", "errno=%d\n", errno))
0062         goto err;
0063     if (CHECK_FAIL(system(PING_CMD)))
0064         goto err;
0065
0066     /* allocate some memory (4Mb) to pin the original cgroup */
0067     ptr = malloc(4 * (1 << 20));
0068     if (CHECK_FAIL(!ptr))
0069         goto err;
0070
0071     /* close programs and cgroup fd */
0072     for (i = 0; i < ARRAY_SIZE(allow_prog); i++) {
0073         close(allow_prog[i]);
0074         allow_prog[i] = -1;
0075     }
0076
0077     close(cg);
0078     cg = 0;
0079
0080     /* leave the cgroup and remove it. don't detach programs */
0081     cleanup_cgroup_environment();
0082
0083     /* wait for the asynchronous auto-detachment.
0084      * wait for no more than 5 sec and give up.
0085      */
0086     for (i = 0; i < ARRAY_SIZE(prog_ids); i++) {
0087         for (attempts = 5; attempts >= 0; attempts--) {
0088             int fd = bpf_prog_get_fd_by_id(prog_ids[i]);
0089
0090             if (fd < 0)
0091                 break;
0092
0093             /* don't leave the fd open */
0094             close(fd);
0095
0096             if (CHECK_FAIL(!attempts))
0097                 goto err;
0098
0099             sleep(1);
0100         }
0101     }
0102
0103 err:
0104     for (i = 0; i < ARRAY_SIZE(allow_prog); i++)
0105         if (allow_prog[i] >= 0)
0106             close(allow_prog[i]);
0107     if (cg)
0108         close(cg);
0109     free(ptr);
0110     cleanup_cgroup_environment();
0111 }