tools/testing/selftests/bpf/prog_tests/cgroup_v1v2.c

   1 // SPDX-License-Identifier: GPL-2.0
   2
   3 #include <test_progs.h>
   4
   5 #include "connect4_dropper.skel.h"
   6
   7 #include "cgroup_helpers.h"
   8 #include "network_helpers.h"
   9
  10 static int run_test(int cgroup_fd, int server_fd, bool classid)
  11 {
  12         struct network_helper_opts opts = {
  13                 .must_fail = true,
  14         };
  15         struct connect4_dropper *skel;
  16         int fd, err = 0;
  17
  18         skel = connect4_dropper__open_and_load();
  19         if (!ASSERT_OK_PTR(skel, "skel_open"))
  20                 return -1;
  21
  22         skel->links.connect_v4_dropper =
  23                 bpf_program__attach_cgroup(skel->progs.connect_v4_dropper,
  24                                            cgroup_fd);
  25         if (!ASSERT_OK_PTR(skel->links.connect_v4_dropper, "prog_attach")) {
  26                 err = -1;
  27                 goto out;
  28         }
  29
  30         if (classid && !ASSERT_OK(join_classid(), "join_classid")) {
  31                 err = -1;
  32                 goto out;
  33         }
  34
  35         fd = connect_to_fd_opts(server_fd, &opts);
  36         if (fd < 0)
  37                 err = -1;
  38         else
  39                 close(fd);
  40 out:
  41         connect4_dropper__destroy(skel);
  42         return err;
  43 }
  44
  45 void test_cgroup_v1v2(void)
  46 {
  47         struct network_helper_opts opts = {};
  48         int server_fd, client_fd, cgroup_fd;
  49         static const int port = 60123;
  50
  51         /* Step 1: Check base connectivity works without any BPF. */
  52         server_fd = start_server(AF_INET, SOCK_STREAM, NULL, port, 0);
  53         if (!ASSERT_GE(server_fd, 0, "server_fd"))
  54                 return;
  55         client_fd = connect_to_fd_opts(server_fd, &opts);
  56         if (!ASSERT_GE(client_fd, 0, "client_fd")) {
  57                 close(server_fd);
  58                 return;
  59         }
  60         close(client_fd);
  61         close(server_fd);
  62
  63         /* Step 2: Check BPF policy prog attached to cgroups drops connectivity. */
  64         cgroup_fd = test__join_cgroup("/connect_dropper");
  65         if (!ASSERT_GE(cgroup_fd, 0, "cgroup_fd"))
  66                 return;
  67         server_fd = start_server(AF_INET, SOCK_STREAM, NULL, port, 0);
  68         if (!ASSERT_GE(server_fd, 0, "server_fd")) {
  69                 close(cgroup_fd);
  70                 return;
  71         }
  72         ASSERT_OK(run_test(cgroup_fd, server_fd, false), "cgroup-v2-only");
  73         setup_classid_environment();
  74         set_classid(42);
  75         ASSERT_OK(run_test(cgroup_fd, server_fd, true), "cgroup-v1v2");
  76         cleanup_classid_environment();
  77         close(server_fd);
  78         close(cgroup_fd);
  79 }