1 // SPDX-License-Identifier: GPL-2.0
2 #define _GNU_SOURCE
3 #include <test_progs.h>
4 #include <network_helpers.h>
5 #include "kfree_skb.skel.h"
6
7 struct meta {
8 int ifindex;
9 __u32 cb32_0;
10 __u8 cb8_0;
11 };
12
13 static union {
14 __u32 cb32[5];
15 __u8 cb8[20];
16 } cb = {
17 .cb32[0] = 0x81828384,
18 };
19
on_sample(void * ctx,int cpu,void * data,__u32 size)20 static void on_sample(void *ctx, int cpu, void *data, __u32 size)
21 {
22 struct meta *meta = (struct meta *)data;
23 struct ipv6_packet *pkt_v6 = data + sizeof(*meta);
24 int duration = 0;
25
26 if (CHECK(size != 72 + sizeof(*meta), "check_size", "size %u != %zu\n",
27 size, 72 + sizeof(*meta)))
28 return;
29 if (CHECK(meta->ifindex != 1, "check_meta_ifindex",
30 "meta->ifindex = %d\n", meta->ifindex))
31 /* spurious kfree_skb not on loopback device */
32 return;
33 if (CHECK(meta->cb8_0 != cb.cb8[0], "check_cb8_0", "cb8_0 %x != %x\n",
34 meta->cb8_0, cb.cb8[0]))
35 return;
36 if (CHECK(meta->cb32_0 != cb.cb32[0], "check_cb32_0",
37 "cb32_0 %x != %x\n",
38 meta->cb32_0, cb.cb32[0]))
39 return;
40 if (CHECK(pkt_v6->eth.h_proto != htons(ETH_P_IPV6), "check_eth",
41 "h_proto %x\n", pkt_v6->eth.h_proto))
42 return;
43 if (CHECK(pkt_v6->iph.nexthdr != 6, "check_ip",
44 "iph.nexthdr %x\n", pkt_v6->iph.nexthdr))
45 return;
46 if (CHECK(pkt_v6->tcp.doff != 5, "check_tcp",
47 "tcp.doff %x\n", pkt_v6->tcp.doff))
48 return;
49
50 *(bool *)ctx = true;
51 }
52
53 /* TODO: fix kernel panic caused by this test in parallel mode */
serial_test_kfree_skb(void)54 void serial_test_kfree_skb(void)
55 {
56 struct __sk_buff skb = {};
57 LIBBPF_OPTS(bpf_test_run_opts, topts,
58 .data_in = &pkt_v6,
59 .data_size_in = sizeof(pkt_v6),
60 .ctx_in = &skb,
61 .ctx_size_in = sizeof(skb),
62 );
63 struct kfree_skb *skel = NULL;
64 struct bpf_link *link;
65 struct bpf_object *obj;
66 struct perf_buffer *pb = NULL;
67 int err, prog_fd;
68 bool passed = false;
69 __u32 duration = 0;
70 const int zero = 0;
71 bool test_ok[2];
72
73 err = bpf_prog_test_load("./test_pkt_access.bpf.o", BPF_PROG_TYPE_SCHED_CLS,
74 &obj, &prog_fd);
75 if (CHECK(err, "prog_load sched cls", "err %d errno %d\n", err, errno))
76 return;
77
78 skel = kfree_skb__open_and_load();
79 if (!ASSERT_OK_PTR(skel, "kfree_skb_skel"))
80 goto close_prog;
81
82 link = bpf_program__attach_raw_tracepoint(skel->progs.trace_kfree_skb, NULL);
83 if (!ASSERT_OK_PTR(link, "attach_raw_tp"))
84 goto close_prog;
85 skel->links.trace_kfree_skb = link;
86
87 link = bpf_program__attach_trace(skel->progs.fentry_eth_type_trans);
88 if (!ASSERT_OK_PTR(link, "attach fentry"))
89 goto close_prog;
90 skel->links.fentry_eth_type_trans = link;
91
92 link = bpf_program__attach_trace(skel->progs.fexit_eth_type_trans);
93 if (!ASSERT_OK_PTR(link, "attach fexit"))
94 goto close_prog;
95 skel->links.fexit_eth_type_trans = link;
96
97 /* set up perf buffer */
98 pb = perf_buffer__new(bpf_map__fd(skel->maps.perf_buf_map), 1,
99 on_sample, NULL, &passed, NULL);
100 if (!ASSERT_OK_PTR(pb, "perf_buf__new"))
101 goto close_prog;
102
103 memcpy(skb.cb, &cb, sizeof(cb));
104 err = bpf_prog_test_run_opts(prog_fd, &topts);
105 ASSERT_OK(err, "ipv6 test_run");
106 ASSERT_OK(topts.retval, "ipv6 test_run retval");
107
108 /* read perf buffer */
109 err = perf_buffer__poll(pb, 100);
110 if (CHECK(err < 0, "perf_buffer__poll", "err %d\n", err))
111 goto close_prog;
112
113 /* make sure kfree_skb program was triggered
114 * and it sent expected skb into ring buffer
115 */
116 ASSERT_TRUE(passed, "passed");
117
118 err = bpf_map_lookup_elem(bpf_map__fd(skel->maps.bss), &zero, test_ok);
119 if (CHECK(err, "get_result",
120 "failed to get output data: %d\n", err))
121 goto close_prog;
122
123 CHECK_FAIL(!test_ok[0] || !test_ok[1]);
124 close_prog:
125 perf_buffer__free(pb);
126 bpf_object__close(obj);
127 kfree_skb__destroy(skel);
128 }
129