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 } 162