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

   1 // SPDX-License-Identifier: GPL-2.0
   2 #include <uapi/linux/bpf.h>
   3 #include <linux/if_link.h>
   4 #include <test_progs.h>
   5
   6 #include "test_xdp_devmap_helpers.skel.h"
   7 #include "test_xdp_with_devmap_helpers.skel.h"
   8
   9 #define IFINDEX_LO 1
  10
  11 static void test_xdp_with_devmap_helpers(void)
  12 {
  13         struct test_xdp_with_devmap_helpers *skel;
  14         struct bpf_prog_info info = {};
  15         struct bpf_devmap_val val = {
  16                 .ifindex = IFINDEX_LO,
  17         };
  18         __u32 len = sizeof(info);
  19         int err, dm_fd, map_fd;
  20         __u32 idx = 0;
  21
  22
  23         skel = test_xdp_with_devmap_helpers__open_and_load();
  24         if (!ASSERT_OK_PTR(skel, "test_xdp_with_devmap_helpers__open_and_load"))
  25                 return;
  26
  27         dm_fd = bpf_program__fd(skel->progs.xdp_redir_prog);
  28         err = bpf_set_link_xdp_fd(IFINDEX_LO, dm_fd, XDP_FLAGS_SKB_MODE);
  29         if (!ASSERT_OK(err, "Generic attach of program with 8-byte devmap"))
  30                 goto out_close;
  31
  32         err = bpf_set_link_xdp_fd(IFINDEX_LO, -1, XDP_FLAGS_SKB_MODE);
  33         ASSERT_OK(err, "XDP program detach");
  34
  35         dm_fd = bpf_program__fd(skel->progs.xdp_dummy_dm);
  36         map_fd = bpf_map__fd(skel->maps.dm_ports);
  37         err = bpf_obj_get_info_by_fd(dm_fd, &info, &len);
  38         if (!ASSERT_OK(err, "bpf_obj_get_info_by_fd"))
  39                 goto out_close;
  40
  41         val.bpf_prog.fd = dm_fd;
  42         err = bpf_map_update_elem(map_fd, &idx, &val, 0);
  43         ASSERT_OK(err, "Add program to devmap entry");
  44
  45         err = bpf_map_lookup_elem(map_fd, &idx, &val);
  46         ASSERT_OK(err, "Read devmap entry");
  47         ASSERT_EQ(info.id, val.bpf_prog.id, "Match program id to devmap entry prog_id");
  48
  49         /* can not attach BPF_XDP_DEVMAP program to a device */
  50         err = bpf_set_link_xdp_fd(IFINDEX_LO, dm_fd, XDP_FLAGS_SKB_MODE);
  51         if (!ASSERT_NEQ(err, 0, "Attach of BPF_XDP_DEVMAP program"))
  52                 bpf_set_link_xdp_fd(IFINDEX_LO, -1, XDP_FLAGS_SKB_MODE);
  53
  54         val.ifindex = 1;
  55         val.bpf_prog.fd = bpf_program__fd(skel->progs.xdp_dummy_prog);
  56         err = bpf_map_update_elem(map_fd, &idx, &val, 0);
  57         ASSERT_NEQ(err, 0, "Add non-BPF_XDP_DEVMAP program to devmap entry");
  58
  59 out_close:
  60         test_xdp_with_devmap_helpers__destroy(skel);
  61 }
  62
  63 static void test_neg_xdp_devmap_helpers(void)
  64 {
  65         struct test_xdp_devmap_helpers *skel;
  66
  67         skel = test_xdp_devmap_helpers__open_and_load();
  68         if (!ASSERT_EQ(skel, NULL,
  69                     "Load of XDP program accessing egress ifindex without attach type")) {
  70                 test_xdp_devmap_helpers__destroy(skel);
  71         }
  72 }
  73
  74
  75 void serial_test_xdp_devmap_attach(void)
  76 {
  77         if (test__start_subtest("DEVMAP with programs in entries"))
  78                 test_xdp_with_devmap_helpers();
  79
  80         if (test__start_subtest("Verifier check of DEVMAP programs"))
  81                 test_neg_xdp_devmap_helpers();
  82 }