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

   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
   8struct meta {
   9        int ifindex;
  10        int pkt_len;
  11};
  12
  13static void on_sample(void *ctx, int cpu, void *data, __u32 size)
  14{
  15        int duration = 0;
  16        struct meta *meta = (struct meta *)data;
  17        struct ipv4_packet *trace_pkt_v4 = data + sizeof(*meta);
  18
  19        if (CHECK(size < sizeof(pkt_v4) + sizeof(*meta),
  20                  "check_size", "size %u < %zu\n",
  21                  size, sizeof(pkt_v4) + sizeof(*meta)))
  22                return;
  23
  24        if (CHECK(meta->ifindex != if_nametoindex("lo"), "check_meta_ifindex",
  25                  "meta->ifindex = %d\n", meta->ifindex))
  26                return;
  27
  28        if (CHECK(meta->pkt_len != sizeof(pkt_v4), "check_meta_pkt_len",
  29                  "meta->pkt_len = %zd\n", sizeof(pkt_v4)))
  30                return;
  31
  32        if (CHECK(memcmp(trace_pkt_v4, &pkt_v4, sizeof(pkt_v4)),
  33                  "check_packet_content", "content not the same\n"))
  34                return;
  35
  36        *(bool *)ctx = true;
  37}
  38
  39void test_xdp_bpf2bpf(void)
  40{
  41        __u32 duration = 0, retval, size;
  42        char buf[128];
  43        int err, pkt_fd, map_fd;
  44        bool passed = false;
  45        struct iphdr *iph = (void *)buf + sizeof(struct ethhdr);
  46        struct iptnl_info value4 = {.family = AF_INET};
  47        struct test_xdp *pkt_skel = NULL;
  48        struct test_xdp_bpf2bpf *ftrace_skel = NULL;
  49        struct vip key4 = {.protocol = 6, .family = AF_INET};
  50        struct bpf_program *prog;
  51        struct perf_buffer *pb = NULL;
  52        struct perf_buffer_opts pb_opts = {};
  53
  54        /* Load XDP program to introspect */
  55        pkt_skel = test_xdp__open_and_load();
  56        if (CHECK(!pkt_skel, "pkt_skel_load", "test_xdp skeleton failed\n"))
  57                return;
  58
  59        pkt_fd = bpf_program__fd(pkt_skel->progs._xdp_tx_iptunnel);
  60
  61        map_fd = bpf_map__fd(pkt_skel->maps.vip2tnl);
  62        bpf_map_update_elem(map_fd, &key4, &value4, 0);
  63
  64        /* Load trace program */
  65        ftrace_skel = test_xdp_bpf2bpf__open();
  66        if (CHECK(!ftrace_skel, "__open", "ftrace skeleton failed\n"))
  67                goto out;
  68
  69        /* Demonstrate the bpf_program__set_attach_target() API rather than
  70         * the load with options, i.e. opts.attach_prog_fd.
  71         */
  72        prog = ftrace_skel->progs.trace_on_entry;
  73        bpf_program__set_expected_attach_type(prog, BPF_TRACE_FENTRY);
  74        bpf_program__set_attach_target(prog, pkt_fd, "_xdp_tx_iptunnel");
  75
  76        prog = ftrace_skel->progs.trace_on_exit;
  77        bpf_program__set_expected_attach_type(prog, BPF_TRACE_FEXIT);
  78        bpf_program__set_attach_target(prog, pkt_fd, "_xdp_tx_iptunnel");
  79
  80        err = test_xdp_bpf2bpf__load(ftrace_skel);
  81        if (CHECK(err, "__load", "ftrace skeleton failed\n"))
  82                goto out;
  83
  84        err = test_xdp_bpf2bpf__attach(ftrace_skel);
  85        if (CHECK(err, "ftrace_attach", "ftrace attach failed: %d\n", err))
  86                goto out;
  87
  88        /* Set up perf buffer */
  89        pb_opts.sample_cb = on_sample;
  90        pb_opts.ctx = &passed;
  91        pb = perf_buffer__new(bpf_map__fd(ftrace_skel->maps.perf_buf_map),
  92                              1, &pb_opts);
  93        if (CHECK(IS_ERR(pb), "perf_buf__new", "err %ld\n", PTR_ERR(pb)))
  94                goto out;
  95
  96        /* Run test program */
  97        err = bpf_prog_test_run(pkt_fd, 1, &pkt_v4, sizeof(pkt_v4),
  98                                buf, &size, &retval, &duration);
  99
 100        if (CHECK(err || retval != XDP_TX || size != 74 ||
 101                  iph->protocol != IPPROTO_IPIP, "ipv4",
 102                  "err %d errno %d retval %d size %d\n",
 103                  err, errno, retval, size))
 104                goto out;
 105
 106        /* Make sure bpf_xdp_output() was triggered and it sent the expected
 107         * data to the perf ring buffer.
 108         */
 109        err = perf_buffer__poll(pb, 100);
 110        if (CHECK(err < 0, "perf_buffer__poll", "err %d\n", err))
 111                goto out;
 112
 113        CHECK_FAIL(!passed);
 114
 115        /* Verify test results */
 116        if (CHECK(ftrace_skel->bss->test_result_fentry != if_nametoindex("lo"),
 117                  "result", "fentry failed err %llu\n",
 118                  ftrace_skel->bss->test_result_fentry))
 119                goto out;
 120
 121        CHECK(ftrace_skel->bss->test_result_fexit != XDP_TX, "result",
 122              "fexit failed err %llu\n", ftrace_skel->bss->test_result_fexit);
 123
 124out:
 125        if (pb)
 126                perf_buffer__free(pb);
 127        test_xdp__destroy(pkt_skel);
 128        test_xdp_bpf2bpf__destroy(ftrace_skel);
 129}
 130