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

   1 // SPDX-License-Identifier: GPL-2.0
   2 #include <test_progs.h>
   3 #include "udp_limit.skel.h"
   4
   5 #include <sys/types.h>
   6 #include <sys/socket.h>
   7
   8 static int duration;
   9
  10 void test_udp_limit(void)
  11 {
  12         struct udp_limit *skel;
  13         int fd1 = -1, fd2 = -1;
  14         int cgroup_fd;
  15
  16         cgroup_fd = test__join_cgroup("/udp_limit");
  17         if (CHECK(cgroup_fd < 0, "cg-join", "errno %d", errno))
  18                 return;
  19
  20         skel = udp_limit__open_and_load();
  21         if (CHECK(!skel, "skel-load", "errno %d", errno))
  22                 goto close_cgroup_fd;
  23
  24         skel->links.sock = bpf_program__attach_cgroup(skel->progs.sock, cgroup_fd);
  25         if (!ASSERT_OK_PTR(skel->links.sock, "cg_attach_sock"))
  26                 goto close_skeleton;
  27         skel->links.sock_release = bpf_program__attach_cgroup(skel->progs.sock_release, cgroup_fd);
  28         if (!ASSERT_OK_PTR(skel->links.sock_release, "cg_attach_sock_release"))
  29                 goto close_skeleton;
  30
  31         /* BPF program enforces a single UDP socket per cgroup,
  32          * verify that.
  33          */
  34         fd1 = socket(AF_INET, SOCK_DGRAM, 0);
  35         if (CHECK(fd1 < 0, "fd1", "errno %d", errno))
  36                 goto close_skeleton;
  37
  38         fd2 = socket(AF_INET, SOCK_DGRAM, 0);
  39         if (CHECK(fd2 >= 0, "fd2", "errno %d", errno))
  40                 goto close_skeleton;
  41
  42         /* We can reopen again after close. */
  43         close(fd1);
  44         fd1 = -1;
  45
  46         fd1 = socket(AF_INET, SOCK_DGRAM, 0);
  47         if (CHECK(fd1 < 0, "fd1-again", "errno %d", errno))
  48                 goto close_skeleton;
  49
  50         /* Make sure the program was invoked the expected
  51          * number of times:
  52          * - open fd1           - BPF_CGROUP_INET_SOCK_CREATE
  53          * - attempt to openfd2 - BPF_CGROUP_INET_SOCK_CREATE
  54          * - close fd1          - BPF_CGROUP_INET_SOCK_RELEASE
  55          * - open fd1 again     - BPF_CGROUP_INET_SOCK_CREATE
  56          */
  57         if (CHECK(skel->bss->invocations != 4, "bss-invocations",
  58                   "invocations=%d", skel->bss->invocations))
  59                 goto close_skeleton;
  60
  61         /* We should still have a single socket in use */
  62         if (CHECK(skel->bss->in_use != 1, "bss-in_use",
  63                   "in_use=%d", skel->bss->in_use))
  64                 goto close_skeleton;
  65
  66 close_skeleton:
  67         if (fd1 >= 0)
  68                 close(fd1);
  69         if (fd2 >= 0)
  70                 close(fd2);
  71         udp_limit__destroy(skel);
  72 close_cgroup_fd:
  73         close(cgroup_fd);
  74 }