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

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