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
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