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
on_sample(void * ctx,int cpu,void * data,__u32 size)13 static 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
test_xdp_bpf2bpf(void)39 void 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
124 out:
125 if (pb)
126 perf_buffer__free(pb);
127 test_xdp__destroy(pkt_skel);
128 test_xdp_bpf2bpf__destroy(ftrace_skel);
129 }
130