summaryrefslogtreecommitdiff
path: root/tools/testing/selftests/bpf/prog_tests/fib_lookup.c
blob: 61ccddccf485eccf262956ce36a193bc5a7aba6c (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2023 Meta Platforms, Inc. and affiliates. */

#include <sys/types.h>
#include <net/if.h>

#include "test_progs.h"
#include "network_helpers.h"
#include "fib_lookup.skel.h"

#define SYS(fmt, ...)						\
	({							\
		char cmd[1024];					\
		snprintf(cmd, sizeof(cmd), fmt, ##__VA_ARGS__);	\
		if (!ASSERT_OK(system(cmd), cmd))		\
			goto fail;				\
	})

#define NS_TEST			"fib_lookup_ns"
#define IPV6_IFACE_ADDR		"face::face"
#define IPV6_NUD_FAILED_ADDR	"face::1"
#define IPV6_NUD_STALE_ADDR	"face::2"
#define IPV4_IFACE_ADDR		"10.0.0.254"
#define IPV4_NUD_FAILED_ADDR	"10.0.0.1"
#define IPV4_NUD_STALE_ADDR	"10.0.0.2"
#define DMAC			"11:11:11:11:11:11"
#define DMAC_INIT { 0x11, 0x11, 0x11, 0x11, 0x11, 0x11, }

struct fib_lookup_test {
	const char *desc;
	const char *daddr;
	int expected_ret;
	int lookup_flags;
	__u8 dmac[6];
};

static const struct fib_lookup_test tests[] = {
	{ .desc = "IPv6 failed neigh",
	  .daddr = IPV6_NUD_FAILED_ADDR, .expected_ret = BPF_FIB_LKUP_RET_NO_NEIGH, },
	{ .desc = "IPv6 stale neigh",
	  .daddr = IPV6_NUD_STALE_ADDR, .expected_ret = BPF_FIB_LKUP_RET_SUCCESS,
	  .dmac = DMAC_INIT, },
	{ .desc = "IPv6 skip neigh",
	  .daddr = IPV6_NUD_FAILED_ADDR, .expected_ret = BPF_FIB_LKUP_RET_SUCCESS,
	  .lookup_flags = BPF_FIB_LOOKUP_SKIP_NEIGH, },
	{ .desc = "IPv4 failed neigh",
	  .daddr = IPV4_NUD_FAILED_ADDR, .expected_ret = BPF_FIB_LKUP_RET_NO_NEIGH, },
	{ .desc = "IPv4 stale neigh",
	  .daddr = IPV4_NUD_STALE_ADDR, .expected_ret = BPF_FIB_LKUP_RET_SUCCESS,
	  .dmac = DMAC_INIT, },
	{ .desc = "IPv4 skip neigh",
	  .daddr = IPV4_NUD_FAILED_ADDR, .expected_ret = BPF_FIB_LKUP_RET_SUCCESS,
	  .lookup_flags = BPF_FIB_LOOKUP_SKIP_NEIGH, },
};

static int ifindex;

static int setup_netns(void)
{
	int err;

	SYS("ip link add veth1 type veth peer name veth2");
	SYS("ip link set dev veth1 up");

	SYS("ip addr add %s/64 dev veth1 nodad", IPV6_IFACE_ADDR);
	SYS("ip neigh add %s dev veth1 nud failed", IPV6_NUD_FAILED_ADDR);
	SYS("ip neigh add %s dev veth1 lladdr %s nud stale", IPV6_NUD_STALE_ADDR, DMAC);

	SYS("ip addr add %s/24 dev veth1 nodad", IPV4_IFACE_ADDR);
	SYS("ip neigh add %s dev veth1 nud failed", IPV4_NUD_FAILED_ADDR);
	SYS("ip neigh add %s dev veth1 lladdr %s nud stale", IPV4_NUD_STALE_ADDR, DMAC);

	err = write_sysctl("/proc/sys/net/ipv4/conf/veth1/forwarding", "1");
	if (!ASSERT_OK(err, "write_sysctl(net.ipv4.conf.veth1.forwarding)"))
		goto fail;

	err = write_sysctl("/proc/sys/net/ipv6/conf/veth1/forwarding", "1");
	if (!ASSERT_OK(err, "write_sysctl(net.ipv6.conf.veth1.forwarding)"))
		goto fail;

	return 0;
fail:
	return -1;
}

static int set_lookup_params(struct bpf_fib_lookup *params, const char *daddr)
{
	int ret;

	memset(params, 0, sizeof(*params));

	params->l4_protocol = IPPROTO_TCP;
	params->ifindex = ifindex;

	if (inet_pton(AF_INET6, daddr, params->ipv6_dst) == 1) {
		params->family = AF_INET6;
		ret = inet_pton(AF_INET6, IPV6_IFACE_ADDR, params->ipv6_src);
		if (!ASSERT_EQ(ret, 1, "inet_pton(IPV6_IFACE_ADDR)"))
			return -1;
		return 0;
	}

	ret = inet_pton(AF_INET, daddr, &params->ipv4_dst);
	if (!ASSERT_EQ(ret, 1, "convert IP[46] address"))
		return -1;
	params->family = AF_INET;
	ret = inet_pton(AF_INET, IPV4_IFACE_ADDR, &params->ipv4_src);
	if (!ASSERT_EQ(ret, 1, "inet_pton(IPV4_IFACE_ADDR)"))
		return -1;

	return 0;
}

static void mac_str(char *b, const __u8 *mac)
{
	sprintf(b, "%02X:%02X:%02X:%02X:%02X:%02X",
		mac[0], mac[1], mac[2], mac[3], mac[4], mac[5]);
}

void test_fib_lookup(void)
{
	struct bpf_fib_lookup *fib_params;
	struct nstoken *nstoken = NULL;
	struct __sk_buff skb = { };
	struct fib_lookup *skel;
	int prog_fd, err, ret, i;

	/* The test does not use the skb->data, so
	 * use pkt_v6 for both v6 and v4 test.
	 */
	LIBBPF_OPTS(bpf_test_run_opts, run_opts,
		    .data_in = &pkt_v6,
		    .data_size_in = sizeof(pkt_v6),
		    .ctx_in = &skb,
		    .ctx_size_in = sizeof(skb),
	);

	skel = fib_lookup__open_and_load();
	if (!ASSERT_OK_PTR(skel, "skel open_and_load"))
		return;
	prog_fd = bpf_program__fd(skel->progs.fib_lookup);

	SYS("ip netns add %s", NS_TEST);

	nstoken = open_netns(NS_TEST);
	if (!ASSERT_OK_PTR(nstoken, "open_netns"))
		goto fail;

	if (setup_netns())
		goto fail;

	ifindex = if_nametoindex("veth1");
	skb.ifindex = ifindex;
	fib_params = &skel->bss->fib_params;

	for (i = 0; i < ARRAY_SIZE(tests); i++) {
		printf("Testing %s\n", tests[i].desc);

		if (set_lookup_params(fib_params, tests[i].daddr))
			continue;
		skel->bss->fib_lookup_ret = -1;
		skel->bss->lookup_flags = BPF_FIB_LOOKUP_OUTPUT |
			tests[i].lookup_flags;

		err = bpf_prog_test_run_opts(prog_fd, &run_opts);
		if (!ASSERT_OK(err, "bpf_prog_test_run_opts"))
			continue;

		ASSERT_EQ(tests[i].expected_ret, skel->bss->fib_lookup_ret,
			  "fib_lookup_ret");

		ret = memcmp(tests[i].dmac, fib_params->dmac, sizeof(tests[i].dmac));
		if (!ASSERT_EQ(ret, 0, "dmac not match")) {
			char expected[18], actual[18];

			mac_str(expected, tests[i].dmac);
			mac_str(actual, fib_params->dmac);
			printf("dmac expected %s actual %s\n", expected, actual);
		}
	}

fail:
	if (nstoken)
		close_netns(nstoken);
	system("ip netns del " NS_TEST " &> /dev/null");
	fib_lookup__destroy(skel);
}