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

   1 // SPDX-License-Identifier: GPL-2.0
   2 #include <test_progs.h>
   3
   4 /* TODO: corrupts other tests uses connect() */
   5 void serial_test_probe_user(void)
   6 {
   7         static const char *const prog_names[] = {
   8                 "handle_sys_connect",
   9 #if defined(__s390x__)
  10                 "handle_sys_socketcall",
  11 #endif
  12         };
  13         enum { prog_count = ARRAY_SIZE(prog_names) };
  14         const char *obj_file = "./test_probe_user.bpf.o";
  15         DECLARE_LIBBPF_OPTS(bpf_object_open_opts, opts, );
  16         int err, results_map_fd, sock_fd, duration = 0;
  17         struct sockaddr curr, orig, tmp;
  18         struct sockaddr_in *in = (struct sockaddr_in *)&curr;
  19         struct bpf_link *kprobe_links[prog_count] = {};
  20         struct bpf_program *kprobe_progs[prog_count];
  21         struct bpf_object *obj;
  22         static const int zero = 0;
  23         size_t i;
  24
  25         obj = bpf_object__open_file(obj_file, &opts);
  26         if (!ASSERT_OK_PTR(obj, "obj_open_file"))
  27                 return;
  28
  29         for (i = 0; i < prog_count; i++) {
  30                 kprobe_progs[i] =
  31                         bpf_object__find_program_by_name(obj, prog_names[i]);
  32                 if (CHECK(!kprobe_progs[i], "find_probe",
  33                           "prog '%s' not found\n", prog_names[i]))
  34                         goto cleanup;
  35         }
  36
  37         err = bpf_object__load(obj);
  38         if (CHECK(err, "obj_load", "err %d\n", err))
  39                 goto cleanup;
  40
  41         results_map_fd = bpf_find_map(__func__, obj, "test_pro.bss");
  42         if (CHECK(results_map_fd < 0, "find_bss_map",
  43                   "err %d\n", results_map_fd))
  44                 goto cleanup;
  45
  46         for (i = 0; i < prog_count; i++) {
  47                 kprobe_links[i] = bpf_program__attach(kprobe_progs[i]);
  48                 if (!ASSERT_OK_PTR(kprobe_links[i], "attach_kprobe"))
  49                         goto cleanup;
  50         }
  51
  52         memset(&curr, 0, sizeof(curr));
  53         in->sin_family = AF_INET;
  54         in->sin_port = htons(5555);
  55         in->sin_addr.s_addr = inet_addr("255.255.255.255");
  56         memcpy(&orig, &curr, sizeof(curr));
  57
  58         sock_fd = socket(AF_INET, SOCK_STREAM, 0);
  59         if (CHECK(sock_fd < 0, "create_sock_fd", "err %d\n", sock_fd))
  60                 goto cleanup;
  61
  62         connect(sock_fd, &curr, sizeof(curr));
  63         close(sock_fd);
  64
  65         err = bpf_map_lookup_elem(results_map_fd, &zero, &tmp);
  66         if (CHECK(err, "get_kprobe_res",
  67                   "failed to get kprobe res: %d\n", err))
  68                 goto cleanup;
  69
  70         in = (struct sockaddr_in *)&tmp;
  71         if (CHECK(memcmp(&tmp, &orig, sizeof(orig)), "check_kprobe_res",
  72                   "wrong kprobe res from probe read: %s:%u\n",
  73                   inet_ntoa(in->sin_addr), ntohs(in->sin_port)))
  74                 goto cleanup;
  75
  76         memset(&tmp, 0xab, sizeof(tmp));
  77
  78         in = (struct sockaddr_in *)&curr;
  79         if (CHECK(memcmp(&curr, &tmp, sizeof(tmp)), "check_kprobe_res",
  80                   "wrong kprobe res from probe write: %s:%u\n",
  81                   inet_ntoa(in->sin_addr), ntohs(in->sin_port)))
  82                 goto cleanup;
  83 cleanup:
  84         for (i = 0; i < prog_count; i++)
  85                 bpf_link__destroy(kprobe_links[i]);
  86         bpf_object__close(obj);
  87 }