tools/testing/selftests/bpf/prog_tests/cgroup_storage.c

   1 // SPDX-License-Identifier: GPL-2.0
   2
   3 #include <test_progs.h>
   4 #include "cgroup_helpers.h"
   5 #include "network_helpers.h"
   6 #include "cgroup_storage.skel.h"
   7
   8 #define TEST_CGROUP "/test-bpf-cgroup-storage-buf/"
   9 #define TEST_NS "cgroup_storage_ns"
  10 #define PING_CMD "ping localhost -c 1 -W 1 -q"
  11
  12 static int setup_network(struct nstoken **token)
  13 {
  14         SYS(fail, "ip netns add %s", TEST_NS);
  15         *token = open_netns(TEST_NS);
  16         if (!ASSERT_OK_PTR(*token, "open netns"))
  17                 goto cleanup_ns;
  18         SYS(cleanup_ns, "ip link set lo up");
  19
  20         return 0;
  21
  22 cleanup_ns:
  23         SYS_NOFAIL("ip netns del %s", TEST_NS);
  24 fail:
  25         return -1;
  26 }
  27
  28 static void cleanup_network(struct nstoken *ns)
  29 {
  30         close_netns(ns);
  31         SYS_NOFAIL("ip netns del %s", TEST_NS);
  32 }
  33
  34 void test_cgroup_storage(void)
  35 {
  36         struct bpf_cgroup_storage_key key;
  37         struct cgroup_storage *skel;
  38         struct nstoken *ns = NULL;
  39         unsigned long long value;
  40         int cgroup_fd;
  41         int err;
  42
  43         cgroup_fd = cgroup_setup_and_join(TEST_CGROUP);
  44         if (!ASSERT_OK_FD(cgroup_fd, "create cgroup"))
  45                 return;
  46
  47         if (!ASSERT_OK(setup_network(&ns), "setup network"))
  48                 goto cleanup_cgroup;
  49
  50         skel = cgroup_storage__open_and_load();
  51         if (!ASSERT_OK_PTR(skel, "load program"))
  52                 goto cleanup_network;
  53
  54         skel->links.bpf_prog =
  55                 bpf_program__attach_cgroup(skel->progs.bpf_prog, cgroup_fd);
  56         if (!ASSERT_OK_PTR(skel->links.bpf_prog, "attach program"))
  57                 goto cleanup_progs;
  58
  59         /* Check that one out of every two packets is dropped */
  60         err = SYS_NOFAIL(PING_CMD);
  61         ASSERT_OK(err, "first ping");
  62         err = SYS_NOFAIL(PING_CMD);
  63         ASSERT_NEQ(err, 0, "second ping");
  64         err = SYS_NOFAIL(PING_CMD);
  65         ASSERT_OK(err, "third ping");
  66
  67         err = bpf_map__get_next_key(skel->maps.cgroup_storage, NULL, &key,
  68                                     sizeof(key));
  69         if (!ASSERT_OK(err, "get first key"))
  70                 goto cleanup_progs;
  71         err = bpf_map__lookup_elem(skel->maps.cgroup_storage, &key, sizeof(key),
  72                                    &value, sizeof(value), 0);
  73         if (!ASSERT_OK(err, "first packet count read"))
  74                 goto cleanup_progs;
  75
  76         /* Add one to the packet counter, check again packet filtering */
  77         value++;
  78         err = bpf_map__update_elem(skel->maps.cgroup_storage, &key, sizeof(key),
  79                                    &value, sizeof(value), 0);
  80         if (!ASSERT_OK(err, "increment packet counter"))
  81                 goto cleanup_progs;
  82         err = SYS_NOFAIL(PING_CMD);
  83         ASSERT_OK(err, "fourth ping");
  84         err = SYS_NOFAIL(PING_CMD);
  85         ASSERT_NEQ(err, 0, "fifth ping");
  86         err = SYS_NOFAIL(PING_CMD);
  87         ASSERT_OK(err, "sixth ping");
  88
  89 cleanup_progs:
  90         cgroup_storage__destroy(skel);
  91 cleanup_network:
  92         cleanup_network(ns);
  93 cleanup_cgroup:
  94         close(cgroup_fd);
  95         cleanup_cgroup_environment();
  96 }