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