LXR linux/tools/testing/selftests/bpf/prog_tests/xdp_devmap

   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
  11void 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        __u32 duration = 0, idx = 0;
  20        int err, dm_fd, map_fd;
  21
  22
  23        skel = test_xdp_with_devmap_helpers__open_and_load();
  24        if (CHECK_FAIL(!skel)) {
  25                perror("test_xdp_with_devmap_helpers__open_and_load");
  26                return;
  27        }
  28
  29        /* can not attach program with DEVMAPs that allow programs
  30         * as xdp generic
  31         */
  32        dm_fd = bpf_program__fd(skel->progs.xdp_redir_prog);
  33        err = bpf_set_link_xdp_fd(IFINDEX_LO, dm_fd, XDP_FLAGS_SKB_MODE);
  34        CHECK(err == 0, "Generic attach of program with 8-byte devmap",
  35              "should have failed\n");
  36
  37        dm_fd = bpf_program__fd(skel->progs.xdp_dummy_dm);
  38        map_fd = bpf_map__fd(skel->maps.dm_ports);
  39        err = bpf_obj_get_info_by_fd(dm_fd, &info, &len);
  40        if (CHECK_FAIL(err))
  41                goto out_close;
  42
  43        val.bpf_prog.fd = dm_fd;
  44        err = bpf_map_update_elem(map_fd, &idx, &val, 0);
  45        CHECK(err, "Add program to devmap entry",
  46              "err %d errno %d\n", err, errno);
  47
  48        err = bpf_map_lookup_elem(map_fd, &idx, &val);
  49        CHECK(err, "Read devmap entry", "err %d errno %d\n", err, errno);
  50        CHECK(info.id != val.bpf_prog.id, "Expected program id in devmap entry",
  51              "expected %u read %u\n", info.id, val.bpf_prog.id);
  52
  53        /* can not attach BPF_XDP_DEVMAP program to a device */
  54        err = bpf_set_link_xdp_fd(IFINDEX_LO, dm_fd, XDP_FLAGS_SKB_MODE);
  55        CHECK(err == 0, "Attach of BPF_XDP_DEVMAP program",
  56              "should have failed\n");
  57
  58        val.ifindex = 1;
  59        val.bpf_prog.fd = bpf_program__fd(skel->progs.xdp_dummy_prog);
  60        err = bpf_map_update_elem(map_fd, &idx, &val, 0);
  61        CHECK(err == 0, "Add non-BPF_XDP_DEVMAP program to devmap entry",
  62              "should have failed\n");
  63
  64out_close:
  65        test_xdp_with_devmap_helpers__destroy(skel);
  66}
  67
  68void test_neg_xdp_devmap_helpers(void)
  69{
  70        struct test_xdp_devmap_helpers *skel;
  71        __u32 duration = 0;
  72
  73        skel = test_xdp_devmap_helpers__open_and_load();
  74        if (CHECK(skel,
  75                  "Load of XDP program accessing egress ifindex without attach type",
  76                  "should have failed\n")) {
  77                test_xdp_devmap_helpers__destroy(skel);
  78        }
  79}
  80
  81
  82void test_xdp_devmap_attach(void)
  83{
  84        if (test__start_subtest("DEVMAP with programs in entries"))
  85                test_xdp_with_devmap_helpers();
  86
  87        if (test__start_subtest("Verifier check of DEVMAP programs"))
  88                test_neg_xdp_devmap_helpers();
  89}
  90