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

   1 // SPDX-License-Identifier: GPL-2.0
   2 #include <test_progs.h>
   3 #include <network_helpers.h>
   4 #include <net/if.h>
   5 #include "test_xdp.skel.h"
   6 #include "test_xdp_bpf2bpf.skel.h"
   7
   8 struct meta {
   9         int ifindex;
  10         int pkt_len;
  11 };
  12
  13 struct test_ctx_s {
  14         bool passed;
  15         int pkt_size;
  16 };
  17
  18 struct test_ctx_s test_ctx;
  19
  20 static void on_sample(void *ctx, int cpu, void *data, __u32 size)
  21 {
  22         struct meta *meta = (struct meta *)data;
  23         struct ipv4_packet *trace_pkt_v4 = data + sizeof(*meta);
  24         unsigned char *raw_pkt = data + sizeof(*meta);
  25         struct test_ctx_s *tst_ctx = ctx;
  26
  27         ASSERT_GE(size, sizeof(pkt_v4) + sizeof(*meta), "check_size");
  28         ASSERT_EQ(meta->ifindex, if_nametoindex("lo"), "check_meta_ifindex");
  29         ASSERT_EQ(meta->pkt_len, tst_ctx->pkt_size, "check_meta_pkt_len");
  30         ASSERT_EQ(memcmp(trace_pkt_v4, &pkt_v4, sizeof(pkt_v4)), 0,
  31                   "check_packet_content");
  32
  33         if (meta->pkt_len > sizeof(pkt_v4)) {
  34                 for (int i = 0; i < meta->pkt_len - sizeof(pkt_v4); i++)
  35                         ASSERT_EQ(raw_pkt[i + sizeof(pkt_v4)], (unsigned char)i,
  36                                   "check_packet_content");
  37         }
  38
  39         tst_ctx->passed = true;
  40 }
  41
  42 #define BUF_SZ  9000
  43
  44 static void run_xdp_bpf2bpf_pkt_size(int pkt_fd, struct perf_buffer *pb,
  45                                      struct test_xdp_bpf2bpf *ftrace_skel,
  46                                      int pkt_size)
  47 {
  48         __u8 *buf, *buf_in;
  49         int err;
  50         LIBBPF_OPTS(bpf_test_run_opts, topts);
  51
  52         if (!ASSERT_LE(pkt_size, BUF_SZ, "pkt_size") ||
  53             !ASSERT_GE(pkt_size, sizeof(pkt_v4), "pkt_size"))
  54                 return;
  55
  56         buf_in = malloc(BUF_SZ);
  57         if (!ASSERT_OK_PTR(buf_in, "buf_in malloc()"))
  58                 return;
  59
  60         buf = malloc(BUF_SZ);
  61         if (!ASSERT_OK_PTR(buf, "buf malloc()")) {
  62                 free(buf_in);
  63                 return;
  64         }
  65
  66         test_ctx.passed = false;
  67         test_ctx.pkt_size = pkt_size;
  68
  69         memcpy(buf_in, &pkt_v4, sizeof(pkt_v4));
  70         if (pkt_size > sizeof(pkt_v4)) {
  71                 for (int i = 0; i < (pkt_size - sizeof(pkt_v4)); i++)
  72                         buf_in[i + sizeof(pkt_v4)] = i;
  73         }
  74
  75         /* Run test program */
  76         topts.data_in = buf_in;
  77         topts.data_size_in = pkt_size;
  78         topts.data_out = buf;
  79         topts.data_size_out = BUF_SZ;
  80
  81         err = bpf_prog_test_run_opts(pkt_fd, &topts);
  82
  83         ASSERT_OK(err, "ipv4");
  84         ASSERT_EQ(topts.retval, XDP_PASS, "ipv4 retval");
  85         ASSERT_EQ(topts.data_size_out, pkt_size, "ipv4 size");
  86
  87         /* Make sure bpf_xdp_output() was triggered and it sent the expected
  88          * data to the perf ring buffer.
  89          */
  90         err = perf_buffer__poll(pb, 100);
  91
  92         ASSERT_GE(err, 0, "perf_buffer__poll");
  93         ASSERT_TRUE(test_ctx.passed, "test passed");
  94         /* Verify test results */
  95         ASSERT_EQ(ftrace_skel->bss->test_result_fentry, if_nametoindex("lo"),
  96                   "fentry result");
  97         ASSERT_EQ(ftrace_skel->bss->test_result_fexit, XDP_PASS, "fexit result");
  98
  99         free(buf);
 100         free(buf_in);
 101 }
 102
 103 void test_xdp_bpf2bpf(void)
 104 {
 105         int err, pkt_fd, map_fd;
 106         int pkt_sizes[] = {sizeof(pkt_v4), 1024, 4100, 8200};
 107         struct iptnl_info value4 = {.family = AF_INET6};
 108         struct test_xdp *pkt_skel = NULL;
 109         struct test_xdp_bpf2bpf *ftrace_skel = NULL;
 110         struct vip key4 = {.protocol = 6, .family = AF_INET};
 111         struct bpf_program *prog;
 112         struct perf_buffer *pb = NULL;
 113
 114         /* Load XDP program to introspect */
 115         pkt_skel = test_xdp__open_and_load();
 116         if (!ASSERT_OK_PTR(pkt_skel, "test_xdp__open_and_load"))
 117                 return;
 118
 119         pkt_fd = bpf_program__fd(pkt_skel->progs._xdp_tx_iptunnel);
 120
 121         map_fd = bpf_map__fd(pkt_skel->maps.vip2tnl);
 122         bpf_map_update_elem(map_fd, &key4, &value4, 0);
 123
 124         /* Load trace program */
 125         ftrace_skel = test_xdp_bpf2bpf__open();
 126         if (!ASSERT_OK_PTR(ftrace_skel, "test_xdp_bpf2bpf__open"))
 127                 goto out;
 128
 129         /* Demonstrate the bpf_program__set_attach_target() API rather than
 130          * the load with options, i.e. opts.attach_prog_fd.
 131          */
 132         prog = ftrace_skel->progs.trace_on_entry;
 133         bpf_program__set_expected_attach_type(prog, BPF_TRACE_FENTRY);
 134         bpf_program__set_attach_target(prog, pkt_fd, "_xdp_tx_iptunnel");
 135
 136         prog = ftrace_skel->progs.trace_on_exit;
 137         bpf_program__set_expected_attach_type(prog, BPF_TRACE_FEXIT);
 138         bpf_program__set_attach_target(prog, pkt_fd, "_xdp_tx_iptunnel");
 139
 140         err = test_xdp_bpf2bpf__load(ftrace_skel);
 141         if (!ASSERT_OK(err, "test_xdp_bpf2bpf__load"))
 142                 goto out;
 143
 144         err = test_xdp_bpf2bpf__attach(ftrace_skel);
 145         if (!ASSERT_OK(err, "test_xdp_bpf2bpf__attach"))
 146                 goto out;
 147
 148         /* Set up perf buffer */
 149         pb = perf_buffer__new(bpf_map__fd(ftrace_skel->maps.perf_buf_map), 8,
 150                               on_sample, NULL, &test_ctx, NULL);
 151         if (!ASSERT_OK_PTR(pb, "perf_buf__new"))
 152                 goto out;
 153
 154         for (int i = 0; i < ARRAY_SIZE(pkt_sizes); i++)
 155                 run_xdp_bpf2bpf_pkt_size(pkt_fd, pb, ftrace_skel,
 156                                          pkt_sizes[i]);
 157 out:
 158         perf_buffer__free(pb);
 159         test_xdp__destroy(pkt_skel);
 160         test_xdp_bpf2bpf__destroy(ftrace_skel);
 161 }