tools/testing/selftests/bpf/prog_tests/fexit_bpf2bpf.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /* Copyright (c) 2019 Facebook */
   3 #include <test_progs.h>
   4
   5 static void test_fexit_bpf2bpf_common(const char *obj_file,
   6                                       const char *target_obj_file,
   7                                       int prog_cnt,
   8                                       const char **prog_name)
   9 {
  10         struct bpf_object *obj = NULL, *pkt_obj;
  11         int err, pkt_fd, i;
  12         struct bpf_link **link = NULL;
  13         struct bpf_program **prog = NULL;
  14         __u32 duration = 0, retval;
  15         struct bpf_map *data_map;
  16         const int zero = 0;
  17         u64 *result = NULL;
  18
  19         err = bpf_prog_load(target_obj_file, BPF_PROG_TYPE_UNSPEC,
  20                             &pkt_obj, &pkt_fd);
  21         if (CHECK(err, "prog_load sched cls", "err %d errno %d\n", err, errno))
  22                 return;
  23         DECLARE_LIBBPF_OPTS(bpf_object_open_opts, opts,
  24                             .attach_prog_fd = pkt_fd,
  25                            );
  26
  27         link = calloc(sizeof(struct bpf_link *), prog_cnt);
  28         prog = calloc(sizeof(struct bpf_program *), prog_cnt);
  29         result = malloc((prog_cnt + 32 /* spare */) * sizeof(u64));
  30         if (CHECK(!link || !prog || !result, "alloc_memory",
  31                   "failed to alloc memory"))
  32                 goto close_prog;
  33
  34         obj = bpf_object__open_file(obj_file, &opts);
  35         if (CHECK(IS_ERR_OR_NULL(obj), "obj_open",
  36                   "failed to open fexit_bpf2bpf: %ld\n",
  37                   PTR_ERR(obj)))
  38                 goto close_prog;
  39
  40         err = bpf_object__load(obj);
  41         if (CHECK(err, "obj_load", "err %d\n", err))
  42                 goto close_prog;
  43
  44         for (i = 0; i < prog_cnt; i++) {
  45                 prog[i] = bpf_object__find_program_by_title(obj, prog_name[i]);
  46                 if (CHECK(!prog[i], "find_prog", "prog %s not found\n", prog_name[i]))
  47                         goto close_prog;
  48                 link[i] = bpf_program__attach_trace(prog[i]);
  49                 if (CHECK(IS_ERR(link[i]), "attach_trace", "failed to link\n"))
  50                         goto close_prog;
  51         }
  52         data_map = bpf_object__find_map_by_name(obj, "fexit_bp.bss");
  53         if (CHECK(!data_map, "find_data_map", "data map not found\n"))
  54                 goto close_prog;
  55
  56         err = bpf_prog_test_run(pkt_fd, 1, &pkt_v6, sizeof(pkt_v6),
  57                                 NULL, NULL, &retval, &duration);
  58         CHECK(err || retval, "ipv6",
  59               "err %d errno %d retval %d duration %d\n",
  60               err, errno, retval, duration);
  61
  62         err = bpf_map_lookup_elem(bpf_map__fd(data_map), &zero, result);
  63         if (CHECK(err, "get_result",
  64                   "failed to get output data: %d\n", err))
  65                 goto close_prog;
  66
  67         for (i = 0; i < prog_cnt; i++)
  68                 if (CHECK(result[i] != 1, "result", "fexit_bpf2bpf failed err %ld\n",
  69                           result[i]))
  70                         goto close_prog;
  71
  72 close_prog:
  73         for (i = 0; i < prog_cnt; i++)
  74                 if (!IS_ERR_OR_NULL(link[i]))
  75                         bpf_link__destroy(link[i]);
  76         if (!IS_ERR_OR_NULL(obj))
  77                 bpf_object__close(obj);
  78         bpf_object__close(pkt_obj);
  79         free(link);
  80         free(prog);
  81         free(result);
  82 }
  83
  84 static void test_target_no_callees(void)
  85 {
  86         const char *prog_name[] = {
  87                 "fexit/test_pkt_md_access",
  88         };
  89         test_fexit_bpf2bpf_common("./fexit_bpf2bpf_simple.o",
  90                                   "./test_pkt_md_access.o",
  91                                   ARRAY_SIZE(prog_name),
  92                                   prog_name);
  93 }
  94
  95 static void test_target_yes_callees(void)
  96 {
  97         const char *prog_name[] = {
  98                 "fexit/test_pkt_access",
  99                 "fexit/test_pkt_access_subprog1",
 100                 "fexit/test_pkt_access_subprog2",
 101                 "fexit/test_pkt_access_subprog3",
 102         };
 103         test_fexit_bpf2bpf_common("./fexit_bpf2bpf.o",
 104                                   "./test_pkt_access.o",
 105                                   ARRAY_SIZE(prog_name),
 106                                   prog_name);
 107 }
 108
 109 static void test_func_replace(void)
 110 {
 111         const char *prog_name[] = {
 112                 "fexit/test_pkt_access",
 113                 "fexit/test_pkt_access_subprog1",
 114                 "fexit/test_pkt_access_subprog2",
 115                 "fexit/test_pkt_access_subprog3",
 116                 "freplace/get_skb_len",
 117                 "freplace/get_skb_ifindex",
 118                 "freplace/get_constant",
 119         };
 120         test_fexit_bpf2bpf_common("./fexit_bpf2bpf.o",
 121                                   "./test_pkt_access.o",
 122                                   ARRAY_SIZE(prog_name),
 123                                   prog_name);
 124 }
 125
 126 void test_fexit_bpf2bpf(void)
 127 {
 128         test_target_no_callees();
 129         test_target_yes_callees();
 130         test_func_replace();
 131 }