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         skel->links.sock_release = bpf_program__attach_cgroup(skel->progs.sock_release, cgroup_fd);
  26         if (CHECK(IS_ERR(skel->links.sock) || IS_ERR(skel->links.sock_release),
  27                   "cg-attach", "sock %ld sock_release %ld",
  28                   PTR_ERR(skel->links.sock),
  29                   PTR_ERR(skel->links.sock_release)))
  30                 goto close_skeleton;
  31
  32         /* BPF program enforces a single UDP socket per cgroup,
  33          * verify that.
  34          */
  35         fd1 = socket(AF_INET, SOCK_DGRAM, 0);
  36         if (CHECK(fd1 < 0, "fd1", "errno %d", errno))
  37                 goto close_skeleton;
  38
  39         fd2 = socket(AF_INET, SOCK_DGRAM, 0);
  40         if (CHECK(fd2 >= 0, "fd2", "errno %d", errno))
  41                 goto close_skeleton;
  42
  43         /* We can reopen again after close. */
  44         close(fd1);
  45         fd1 = -1;
  46
  47         fd1 = socket(AF_INET, SOCK_DGRAM, 0);
  48         if (CHECK(fd1 < 0, "fd1-again", "errno %d", errno))
  49                 goto close_skeleton;
  50
  51         /* Make sure the program was invoked the expected
  52          * number of times:
  53          * - open fd1           - BPF_CGROUP_INET_SOCK_CREATE
  54          * - attempt to openfd2 - BPF_CGROUP_INET_SOCK_CREATE
  55          * - close fd1          - BPF_CGROUP_INET_SOCK_RELEASE
  56          * - open fd1 again     - BPF_CGROUP_INET_SOCK_CREATE
  57          */
  58         if (CHECK(skel->bss->invocations != 4, "bss-invocations",
  59                   "invocations=%d", skel->bss->invocations))
  60                 goto close_skeleton;
  61
  62         /* We should still have a single socket in use */
  63         if (CHECK(skel->bss->in_use != 1, "bss-in_use",
  64                   "in_use=%d", skel->bss->in_use))
  65                 goto close_skeleton;
  66
  67 close_skeleton:
  68         if (fd1 >= 0)
  69                 close(fd1);
  70         if (fd2 >= 0)
  71                 close(fd2);
  72         udp_limit__destroy(skel);
  73 close_cgroup_fd:
  74         close(cgroup_fd);
  75 }