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

   1 // SPDX-License-Identifier: GPL-2.0
   2 #include <test_progs.h>
   3
   4 #define IFINDEX_LO 1
   5 #define XDP_FLAGS_REPLACE               (1U << 4)
   6
   7 void test_xdp_attach(void)
   8 {
   9         __u32 duration = 0, id1, id2, id0 = 0, len;
  10         struct bpf_object *obj1, *obj2, *obj3;
  11         const char *file = "./test_xdp.o";
  12         struct bpf_prog_info info = {};
  13         int err, fd1, fd2, fd3;
  14         DECLARE_LIBBPF_OPTS(bpf_xdp_set_link_opts, opts,
  15                             .old_fd = -1);
  16
  17         len = sizeof(info);
  18
  19         err = bpf_prog_load(file, BPF_PROG_TYPE_XDP, &obj1, &fd1);
  20         if (CHECK_FAIL(err))
  21                 return;
  22         err = bpf_obj_get_info_by_fd(fd1, &info, &len);
  23         if (CHECK_FAIL(err))
  24                 goto out_1;
  25         id1 = info.id;
  26
  27         err = bpf_prog_load(file, BPF_PROG_TYPE_XDP, &obj2, &fd2);
  28         if (CHECK_FAIL(err))
  29                 goto out_1;
  30
  31         memset(&info, 0, sizeof(info));
  32         err = bpf_obj_get_info_by_fd(fd2, &info, &len);
  33         if (CHECK_FAIL(err))
  34                 goto out_2;
  35         id2 = info.id;
  36
  37         err = bpf_prog_load(file, BPF_PROG_TYPE_XDP, &obj3, &fd3);
  38         if (CHECK_FAIL(err))
  39                 goto out_2;
  40
  41         err = bpf_set_link_xdp_fd_opts(IFINDEX_LO, fd1, XDP_FLAGS_REPLACE,
  42                                        &opts);
  43         if (CHECK(err, "load_ok", "initial load failed"))
  44                 goto out_close;
  45
  46         err = bpf_get_link_xdp_id(IFINDEX_LO, &id0, 0);
  47         if (CHECK(err || id0 != id1, "id1_check",
  48                   "loaded prog id %u != id1 %u, err %d", id0, id1, err))
  49                 goto out_close;
  50
  51         err = bpf_set_link_xdp_fd_opts(IFINDEX_LO, fd2, XDP_FLAGS_REPLACE,
  52                                        &opts);
  53         if (CHECK(!err, "load_fail", "load with expected id didn't fail"))
  54                 goto out;
  55
  56         opts.old_fd = fd1;
  57         err = bpf_set_link_xdp_fd_opts(IFINDEX_LO, fd2, 0, &opts);
  58         if (CHECK(err, "replace_ok", "replace valid old_fd failed"))
  59                 goto out;
  60         err = bpf_get_link_xdp_id(IFINDEX_LO, &id0, 0);
  61         if (CHECK(err || id0 != id2, "id2_check",
  62                   "loaded prog id %u != id2 %u, err %d", id0, id2, err))
  63                 goto out_close;
  64
  65         err = bpf_set_link_xdp_fd_opts(IFINDEX_LO, fd3, 0, &opts);
  66         if (CHECK(!err, "replace_fail", "replace invalid old_fd didn't fail"))
  67                 goto out;
  68
  69         err = bpf_set_link_xdp_fd_opts(IFINDEX_LO, -1, 0, &opts);
  70         if (CHECK(!err, "remove_fail", "remove invalid old_fd didn't fail"))
  71                 goto out;
  72
  73         opts.old_fd = fd2;
  74         err = bpf_set_link_xdp_fd_opts(IFINDEX_LO, -1, 0, &opts);
  75         if (CHECK(err, "remove_ok", "remove valid old_fd failed"))
  76                 goto out;
  77
  78         err = bpf_get_link_xdp_id(IFINDEX_LO, &id0, 0);
  79         if (CHECK(err || id0 != 0, "unload_check",
  80                   "loaded prog id %u != 0, err %d", id0, err))
  81                 goto out_close;
  82 out:
  83         bpf_set_link_xdp_fd(IFINDEX_LO, -1, 0);
  84 out_close:
  85         bpf_object__close(obj3);
  86 out_2:
  87         bpf_object__close(obj2);
  88 out_1:
  89         bpf_object__close(obj1);
  90 }