162 lines · c
1// SPDX-License-Identifier: GPL-2.02#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 13struct test_ctx_s {14 bool passed;15 int pkt_size;16};17 18struct test_ctx_s test_ctx;19 20static 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 900043 44static 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 expected88 * 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 103void 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 than130 * 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]);157out:158 perf_buffer__free(pb);159 test_xdp__destroy(pkt_skel);160 test_xdp_bpf2bpf__destroy(ftrace_skel);161}162