LXR linux/tools/testing/selftests/bpf/prog_tests/cgroup

   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
  10static 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);
  40out:
  41        connect4_dropper__destroy(skel);
  42        return err;
  43}
  44
  45void 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}
  80