293 lines
9.1 KiB
C
293 lines
9.1 KiB
C
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// 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 map_fd = -1;
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static int prog_load_cnt(int verdict, int val)
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{
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int cgroup_storage_fd, percpu_cgroup_storage_fd;
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if (map_fd < 0)
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map_fd = bpf_create_map(BPF_MAP_TYPE_ARRAY, 4, 8, 1, 0);
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if (map_fd < 0) {
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printf("failed to create map '%s'\n", strerror(errno));
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return -1;
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}
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cgroup_storage_fd = bpf_create_map(BPF_MAP_TYPE_CGROUP_STORAGE,
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sizeof(struct bpf_cgroup_storage_key), 8, 0, 0);
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if (cgroup_storage_fd < 0) {
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printf("failed to create map '%s'\n", strerror(errno));
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return -1;
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}
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percpu_cgroup_storage_fd = bpf_create_map(
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BPF_MAP_TYPE_PERCPU_CGROUP_STORAGE,
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sizeof(struct bpf_cgroup_storage_key), 8, 0, 0);
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if (percpu_cgroup_storage_fd < 0) {
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printf("failed to create map '%s'\n", strerror(errno));
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return -1;
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}
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struct bpf_insn prog[] = {
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BPF_MOV32_IMM(BPF_REG_0, 0),
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BPF_STX_MEM(BPF_W, BPF_REG_10, BPF_REG_0, -4), /* *(u32 *)(fp - 4) = r0 */
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BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
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BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -4), /* r2 = fp - 4 */
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BPF_LD_MAP_FD(BPF_REG_1, map_fd),
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BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_map_lookup_elem),
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BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 2),
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BPF_MOV64_IMM(BPF_REG_1, val), /* r1 = 1 */
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BPF_ATOMIC_OP(BPF_DW, BPF_ADD, BPF_REG_0, BPF_REG_1, 0),
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BPF_LD_MAP_FD(BPF_REG_1, cgroup_storage_fd),
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BPF_MOV64_IMM(BPF_REG_2, 0),
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BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_get_local_storage),
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BPF_MOV64_IMM(BPF_REG_1, val),
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BPF_ATOMIC_OP(BPF_W, BPF_ADD, BPF_REG_0, BPF_REG_1, 0),
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BPF_LD_MAP_FD(BPF_REG_1, percpu_cgroup_storage_fd),
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BPF_MOV64_IMM(BPF_REG_2, 0),
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BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_get_local_storage),
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BPF_LDX_MEM(BPF_W, BPF_REG_3, BPF_REG_0, 0),
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BPF_ALU64_IMM(BPF_ADD, BPF_REG_3, 0x1),
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BPF_STX_MEM(BPF_W, BPF_REG_0, BPF_REG_3, 0),
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BPF_MOV64_IMM(BPF_REG_0, verdict), /* r0 = verdict */
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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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int ret;
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ret = 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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close(cgroup_storage_fd);
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return ret;
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}
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void test_cgroup_attach_multi(void)
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{
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__u32 prog_ids[4], prog_cnt = 0, attach_flags, saved_prog_id;
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int cg1 = 0, cg2 = 0, cg3 = 0, cg4 = 0, cg5 = 0, key = 0;
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DECLARE_LIBBPF_OPTS(bpf_prog_attach_opts, attach_opts);
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int allow_prog[7] = {-1};
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unsigned long long value;
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__u32 duration = 0;
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int i = 0;
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for (i = 0; i < ARRAY_SIZE(allow_prog); i++) {
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allow_prog[i] = prog_load_cnt(1, 1 << i);
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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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cg1 = create_and_get_cgroup("/cg1");
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if (CHECK_FAIL(cg1 < 0))
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goto err;
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cg2 = create_and_get_cgroup("/cg1/cg2");
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if (CHECK_FAIL(cg2 < 0))
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goto err;
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cg3 = create_and_get_cgroup("/cg1/cg2/cg3");
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if (CHECK_FAIL(cg3 < 0))
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goto err;
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cg4 = create_and_get_cgroup("/cg1/cg2/cg3/cg4");
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if (CHECK_FAIL(cg4 < 0))
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goto err;
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cg5 = create_and_get_cgroup("/cg1/cg2/cg3/cg4/cg5");
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if (CHECK_FAIL(cg5 < 0))
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goto err;
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if (CHECK_FAIL(join_cgroup("/cg1/cg2/cg3/cg4/cg5")))
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goto err;
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if (CHECK(bpf_prog_attach(allow_prog[0], cg1, BPF_CGROUP_INET_EGRESS,
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BPF_F_ALLOW_MULTI),
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"prog0_attach_to_cg1_multi", "errno=%d\n", errno))
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goto err;
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if (CHECK(!bpf_prog_attach(allow_prog[0], cg1, BPF_CGROUP_INET_EGRESS,
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BPF_F_ALLOW_MULTI),
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"fail_same_prog_attach_to_cg1", "unexpected success\n"))
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goto err;
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if (CHECK(bpf_prog_attach(allow_prog[1], cg1, BPF_CGROUP_INET_EGRESS,
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BPF_F_ALLOW_MULTI),
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"prog1_attach_to_cg1_multi", "errno=%d\n", errno))
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goto err;
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if (CHECK(bpf_prog_attach(allow_prog[2], cg2, BPF_CGROUP_INET_EGRESS,
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BPF_F_ALLOW_OVERRIDE),
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"prog2_attach_to_cg2_override", "errno=%d\n", errno))
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goto err;
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if (CHECK(bpf_prog_attach(allow_prog[3], cg3, BPF_CGROUP_INET_EGRESS,
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BPF_F_ALLOW_MULTI),
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"prog3_attach_to_cg3_multi", "errno=%d\n", errno))
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goto err;
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if (CHECK(bpf_prog_attach(allow_prog[4], cg4, BPF_CGROUP_INET_EGRESS,
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BPF_F_ALLOW_OVERRIDE),
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"prog4_attach_to_cg4_override", "errno=%d\n", errno))
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goto err;
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if (CHECK(bpf_prog_attach(allow_prog[5], cg5, BPF_CGROUP_INET_EGRESS, 0),
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"prog5_attach_to_cg5_none", "errno=%d\n", errno))
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goto err;
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CHECK_FAIL(system(PING_CMD));
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CHECK_FAIL(bpf_map_lookup_elem(map_fd, &key, &value));
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CHECK_FAIL(value != 1 + 2 + 8 + 32);
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/* query the number of effective progs in cg5 */
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CHECK_FAIL(bpf_prog_query(cg5, BPF_CGROUP_INET_EGRESS,
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BPF_F_QUERY_EFFECTIVE, NULL, NULL, &prog_cnt));
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CHECK_FAIL(prog_cnt != 4);
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/* retrieve prog_ids of effective progs in cg5 */
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CHECK_FAIL(bpf_prog_query(cg5, BPF_CGROUP_INET_EGRESS,
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BPF_F_QUERY_EFFECTIVE, &attach_flags,
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prog_ids, &prog_cnt));
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CHECK_FAIL(prog_cnt != 4);
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CHECK_FAIL(attach_flags != 0);
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saved_prog_id = prog_ids[0];
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/* check enospc handling */
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prog_ids[0] = 0;
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prog_cnt = 2;
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CHECK_FAIL(bpf_prog_query(cg5, BPF_CGROUP_INET_EGRESS,
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BPF_F_QUERY_EFFECTIVE, &attach_flags,
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prog_ids, &prog_cnt) >= 0);
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CHECK_FAIL(errno != ENOSPC);
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CHECK_FAIL(prog_cnt != 4);
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/* check that prog_ids are returned even when buffer is too small */
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CHECK_FAIL(prog_ids[0] != saved_prog_id);
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/* retrieve prog_id of single attached prog in cg5 */
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prog_ids[0] = 0;
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CHECK_FAIL(bpf_prog_query(cg5, BPF_CGROUP_INET_EGRESS, 0, NULL,
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prog_ids, &prog_cnt));
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CHECK_FAIL(prog_cnt != 1);
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CHECK_FAIL(prog_ids[0] != saved_prog_id);
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/* detach bottom program and ping again */
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if (CHECK(bpf_prog_detach2(-1, cg5, BPF_CGROUP_INET_EGRESS),
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"prog_detach_from_cg5", "errno=%d\n", errno))
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goto err;
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value = 0;
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CHECK_FAIL(bpf_map_update_elem(map_fd, &key, &value, 0));
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CHECK_FAIL(system(PING_CMD));
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CHECK_FAIL(bpf_map_lookup_elem(map_fd, &key, &value));
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CHECK_FAIL(value != 1 + 2 + 8 + 16);
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/* test replace */
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attach_opts.flags = BPF_F_ALLOW_OVERRIDE | BPF_F_REPLACE;
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attach_opts.replace_prog_fd = allow_prog[0];
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if (CHECK(!bpf_prog_attach_xattr(allow_prog[6], cg1,
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BPF_CGROUP_INET_EGRESS, &attach_opts),
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"fail_prog_replace_override", "unexpected success\n"))
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goto err;
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CHECK_FAIL(errno != EINVAL);
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attach_opts.flags = BPF_F_REPLACE;
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if (CHECK(!bpf_prog_attach_xattr(allow_prog[6], cg1,
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BPF_CGROUP_INET_EGRESS, &attach_opts),
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"fail_prog_replace_no_multi", "unexpected success\n"))
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goto err;
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CHECK_FAIL(errno != EINVAL);
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attach_opts.flags = BPF_F_ALLOW_MULTI | BPF_F_REPLACE;
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attach_opts.replace_prog_fd = -1;
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if (CHECK(!bpf_prog_attach_xattr(allow_prog[6], cg1,
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BPF_CGROUP_INET_EGRESS, &attach_opts),
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"fail_prog_replace_bad_fd", "unexpected success\n"))
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goto err;
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CHECK_FAIL(errno != EBADF);
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/* replacing a program that is not attached to cgroup should fail */
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attach_opts.replace_prog_fd = allow_prog[3];
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if (CHECK(!bpf_prog_attach_xattr(allow_prog[6], cg1,
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BPF_CGROUP_INET_EGRESS, &attach_opts),
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"fail_prog_replace_no_ent", "unexpected success\n"))
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goto err;
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CHECK_FAIL(errno != ENOENT);
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/* replace 1st from the top program */
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attach_opts.replace_prog_fd = allow_prog[0];
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if (CHECK(bpf_prog_attach_xattr(allow_prog[6], cg1,
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BPF_CGROUP_INET_EGRESS, &attach_opts),
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"prog_replace", "errno=%d\n", errno))
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goto err;
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/* replace program with itself */
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attach_opts.replace_prog_fd = allow_prog[6];
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if (CHECK(bpf_prog_attach_xattr(allow_prog[6], cg1,
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BPF_CGROUP_INET_EGRESS, &attach_opts),
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"prog_replace", "errno=%d\n", errno))
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goto err;
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value = 0;
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CHECK_FAIL(bpf_map_update_elem(map_fd, &key, &value, 0));
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CHECK_FAIL(system(PING_CMD));
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CHECK_FAIL(bpf_map_lookup_elem(map_fd, &key, &value));
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CHECK_FAIL(value != 64 + 2 + 8 + 16);
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/* detach 3rd from bottom program and ping again */
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if (CHECK(!bpf_prog_detach2(0, cg3, BPF_CGROUP_INET_EGRESS),
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"fail_prog_detach_from_cg3", "unexpected success\n"))
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goto err;
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if (CHECK(bpf_prog_detach2(allow_prog[3], cg3, BPF_CGROUP_INET_EGRESS),
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"prog3_detach_from_cg3", "errno=%d\n", errno))
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goto err;
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value = 0;
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CHECK_FAIL(bpf_map_update_elem(map_fd, &key, &value, 0));
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CHECK_FAIL(system(PING_CMD));
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CHECK_FAIL(bpf_map_lookup_elem(map_fd, &key, &value));
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CHECK_FAIL(value != 64 + 2 + 16);
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/* detach 2nd from bottom program and ping again */
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if (CHECK(bpf_prog_detach2(-1, cg4, BPF_CGROUP_INET_EGRESS),
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"prog_detach_from_cg4", "errno=%d\n", errno))
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goto err;
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value = 0;
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CHECK_FAIL(bpf_map_update_elem(map_fd, &key, &value, 0));
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CHECK_FAIL(system(PING_CMD));
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CHECK_FAIL(bpf_map_lookup_elem(map_fd, &key, &value));
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CHECK_FAIL(value != 64 + 2 + 4);
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prog_cnt = 4;
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CHECK_FAIL(bpf_prog_query(cg5, BPF_CGROUP_INET_EGRESS,
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BPF_F_QUERY_EFFECTIVE, &attach_flags,
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prog_ids, &prog_cnt));
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CHECK_FAIL(prog_cnt != 3);
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CHECK_FAIL(attach_flags != 0);
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CHECK_FAIL(bpf_prog_query(cg5, BPF_CGROUP_INET_EGRESS, 0, NULL,
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prog_ids, &prog_cnt));
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CHECK_FAIL(prog_cnt != 0);
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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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close(cg1);
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close(cg2);
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close(cg3);
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close(cg4);
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close(cg5);
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cleanup_cgroup_environment();
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}
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