tools/testing/selftests/bpf/prog_tests/xdp_bpf2bpf.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 #include <test_progs.h>
   3 #include <net/if.h>
   4 #include "test_xdp.skel.h"
   5 #include "test_xdp_bpf2bpf.skel.h"
   6
   7 struct meta {
   8         int ifindex;
   9         int pkt_len;
  10 };
  11
  12 static void on_sample(void *ctx, int cpu, void *data, __u32 size)
  13 {
  14         int duration = 0;
  15         struct meta *meta = (struct meta *)data;
  16         struct ipv4_packet *trace_pkt_v4 = data + sizeof(*meta);
  17
  18         if (CHECK(size < sizeof(pkt_v4) + sizeof(*meta),
  19                   "check_size", "size %u < %zu\n",
  20                   size, sizeof(pkt_v4) + sizeof(*meta)))
  21                 return;
  22
  23         if (CHECK(meta->ifindex != if_nametoindex("lo"), "check_meta_ifindex",
  24                   "meta->ifindex = %d\n", meta->ifindex))
  25                 return;
  26
  27         if (CHECK(meta->pkt_len != sizeof(pkt_v4), "check_meta_pkt_len",
  28                   "meta->pkt_len = %zd\n", sizeof(pkt_v4)))
  29                 return;
  30
  31         if (CHECK(memcmp(trace_pkt_v4, &pkt_v4, sizeof(pkt_v4)),
  32                   "check_packet_content", "content not the same\n"))
  33                 return;
  34
  35         *(bool *)ctx = true;
  36 }
  37
  38 void test_xdp_bpf2bpf(void)
  39 {
  40         __u32 duration = 0, retval, size;
  41         char buf[128];
  42         int err, pkt_fd, map_fd;
  43         bool passed = false;
  44         struct iphdr *iph = (void *)buf + sizeof(struct ethhdr);
  45         struct iptnl_info value4 = {.family = AF_INET};
  46         struct test_xdp *pkt_skel = NULL;
  47         struct test_xdp_bpf2bpf *ftrace_skel = NULL;
  48         struct vip key4 = {.protocol = 6, .family = AF_INET};
  49         struct bpf_program *prog;
  50         struct perf_buffer *pb = NULL;
  51         struct perf_buffer_opts pb_opts = {};
  52
  53         /* Load XDP program to introspect */
  54         pkt_skel = test_xdp__open_and_load();
  55         if (CHECK(!pkt_skel, "pkt_skel_load", "test_xdp skeleton failed\n"))
  56                 return;
  57
  58         pkt_fd = bpf_program__fd(pkt_skel->progs._xdp_tx_iptunnel);
  59
  60         map_fd = bpf_map__fd(pkt_skel->maps.vip2tnl);
  61         bpf_map_update_elem(map_fd, &key4, &value4, 0);
  62
  63         /* Load trace program */
  64         ftrace_skel = test_xdp_bpf2bpf__open();
  65         if (CHECK(!ftrace_skel, "__open", "ftrace skeleton failed\n"))
  66                 goto out;
  67
  68         /* Demonstrate the bpf_program__set_attach_target() API rather than
  69          * the load with options, i.e. opts.attach_prog_fd.
  70          */
  71         prog = ftrace_skel->progs.trace_on_entry;
  72         bpf_program__set_expected_attach_type(prog, BPF_TRACE_FENTRY);
  73         bpf_program__set_attach_target(prog, pkt_fd, "_xdp_tx_iptunnel");
  74
  75         prog = ftrace_skel->progs.trace_on_exit;
  76         bpf_program__set_expected_attach_type(prog, BPF_TRACE_FEXIT);
  77         bpf_program__set_attach_target(prog, pkt_fd, "_xdp_tx_iptunnel");
  78
  79         err = test_xdp_bpf2bpf__load(ftrace_skel);
  80         if (CHECK(err, "__load", "ftrace skeleton failed\n"))
  81                 goto out;
  82
  83         err = test_xdp_bpf2bpf__attach(ftrace_skel);
  84         if (CHECK(err, "ftrace_attach", "ftrace attach failed: %d\n", err))
  85                 goto out;
  86
  87         /* Set up perf buffer */
  88         pb_opts.sample_cb = on_sample;
  89         pb_opts.ctx = &passed;
  90         pb = perf_buffer__new(bpf_map__fd(ftrace_skel->maps.perf_buf_map),
  91                               1, &pb_opts);
  92         if (CHECK(IS_ERR(pb), "perf_buf__new", "err %ld\n", PTR_ERR(pb)))
  93                 goto out;
  94
  95         /* Run test program */
  96         err = bpf_prog_test_run(pkt_fd, 1, &pkt_v4, sizeof(pkt_v4),
  97                                 buf, &size, &retval, &duration);
  98
  99         if (CHECK(err || retval != XDP_TX || size != 74 ||
 100                   iph->protocol != IPPROTO_IPIP, "ipv4",
 101                   "err %d errno %d retval %d size %d\n",
 102                   err, errno, retval, size))
 103                 goto out;
 104
 105         /* Make sure bpf_xdp_output() was triggered and it sent the expected
 106          * data to the perf ring buffer.
 107          */
 108         err = perf_buffer__poll(pb, 100);
 109         if (CHECK(err < 0, "perf_buffer__poll", "err %d\n", err))
 110                 goto out;
 111
 112         CHECK_FAIL(!passed);
 113
 114         /* Verify test results */
 115         if (CHECK(ftrace_skel->bss->test_result_fentry != if_nametoindex("lo"),
 116                   "result", "fentry failed err %llu\n",
 117                   ftrace_skel->bss->test_result_fentry))
 118                 goto out;
 119
 120         CHECK(ftrace_skel->bss->test_result_fexit != XDP_TX, "result",
 121               "fexit failed err %llu\n", ftrace_skel->bss->test_result_fexit);
 122
 123 out:
 124         if (pb)
 125                 perf_buffer__free(pb);
 126         test_xdp__destroy(pkt_skel);
 127         test_xdp_bpf2bpf__destroy(ftrace_skel);
 128 }