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