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
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
|
// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2023 Meta Platforms, Inc. and affiliates. */
#include <linux/rtnetlink.h>
#include <sys/types.h>
#include <net/if.h>
#include "test_progs.h"
#include "network_helpers.h"
#include "fib_lookup.skel.h"
#define NS_TEST "fib_lookup_ns"
#define IPV6_IFACE_ADDR "face::face"
#define IPV6_IFACE_ADDR_SEC "cafe::cafe"
#define IPV6_ADDR_DST "face::3"
#define IPV6_NUD_FAILED_ADDR "face::1"
#define IPV6_NUD_STALE_ADDR "face::2"
#define IPV4_IFACE_ADDR "10.0.0.254"
#define IPV4_IFACE_ADDR_SEC "10.1.0.254"
#define IPV4_ADDR_DST "10.2.0.254"
#define IPV4_NUD_FAILED_ADDR "10.0.0.1"
#define IPV4_NUD_STALE_ADDR "10.0.0.2"
#define IPV4_TBID_ADDR "172.0.0.254"
#define IPV4_TBID_NET "172.0.0.0"
#define IPV4_TBID_DST "172.0.0.2"
#define IPV6_TBID_ADDR "fd00::FFFF"
#define IPV6_TBID_NET "fd00::"
#define IPV6_TBID_DST "fd00::2"
#define DMAC "11:11:11:11:11:11"
#define DMAC_INIT { 0x11, 0x11, 0x11, 0x11, 0x11, 0x11, }
#define DMAC2 "01:01:01:01:01:01"
#define DMAC_INIT2 { 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, }
struct fib_lookup_test {
const char *desc;
const char *daddr;
int expected_ret;
const char *expected_src;
int lookup_flags;
__u32 tbid;
__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, },
{ .desc = "IPv4 TBID lookup failure",
.daddr = IPV4_TBID_DST, .expected_ret = BPF_FIB_LKUP_RET_NOT_FWDED,
.lookup_flags = BPF_FIB_LOOKUP_DIRECT | BPF_FIB_LOOKUP_TBID,
.tbid = RT_TABLE_MAIN, },
{ .desc = "IPv4 TBID lookup success",
.daddr = IPV4_TBID_DST, .expected_ret = BPF_FIB_LKUP_RET_SUCCESS,
.lookup_flags = BPF_FIB_LOOKUP_DIRECT | BPF_FIB_LOOKUP_TBID, .tbid = 100,
.dmac = DMAC_INIT2, },
{ .desc = "IPv6 TBID lookup failure",
.daddr = IPV6_TBID_DST, .expected_ret = BPF_FIB_LKUP_RET_NOT_FWDED,
.lookup_flags = BPF_FIB_LOOKUP_DIRECT | BPF_FIB_LOOKUP_TBID,
.tbid = RT_TABLE_MAIN, },
{ .desc = "IPv6 TBID lookup success",
.daddr = IPV6_TBID_DST, .expected_ret = BPF_FIB_LKUP_RET_SUCCESS,
.lookup_flags = BPF_FIB_LOOKUP_DIRECT | BPF_FIB_LOOKUP_TBID, .tbid = 100,
.dmac = DMAC_INIT2, },
{ .desc = "IPv4 set src addr from netdev",
.daddr = IPV4_NUD_FAILED_ADDR, .expected_ret = BPF_FIB_LKUP_RET_SUCCESS,
.expected_src = IPV4_IFACE_ADDR,
.lookup_flags = BPF_FIB_LOOKUP_SRC | BPF_FIB_LOOKUP_SKIP_NEIGH, },
{ .desc = "IPv6 set src addr from netdev",
.daddr = IPV6_NUD_FAILED_ADDR, .expected_ret = BPF_FIB_LKUP_RET_SUCCESS,
.expected_src = IPV6_IFACE_ADDR,
.lookup_flags = BPF_FIB_LOOKUP_SRC | BPF_FIB_LOOKUP_SKIP_NEIGH, },
{ .desc = "IPv4 set prefsrc addr from route",
.daddr = IPV4_ADDR_DST, .expected_ret = BPF_FIB_LKUP_RET_SUCCESS,
.expected_src = IPV4_IFACE_ADDR_SEC,
.lookup_flags = BPF_FIB_LOOKUP_SRC | BPF_FIB_LOOKUP_SKIP_NEIGH, },
{ .desc = "IPv6 set prefsrc addr route",
.daddr = IPV6_ADDR_DST, .expected_ret = BPF_FIB_LKUP_RET_SUCCESS,
.expected_src = IPV6_IFACE_ADDR_SEC,
.lookup_flags = BPF_FIB_LOOKUP_SRC | BPF_FIB_LOOKUP_SKIP_NEIGH, },
};
static int ifindex;
static int setup_netns(void)
{
int err;
SYS(fail, "ip link add veth1 type veth peer name veth2");
SYS(fail, "ip link set dev veth1 up");
SYS(fail, "ip link set dev veth2 up");
err = write_sysctl("/proc/sys/net/ipv4/neigh/veth1/gc_stale_time", "900");
if (!ASSERT_OK(err, "write_sysctl(net.ipv4.neigh.veth1.gc_stale_time)"))
goto fail;
err = write_sysctl("/proc/sys/net/ipv6/neigh/veth1/gc_stale_time", "900");
if (!ASSERT_OK(err, "write_sysctl(net.ipv6.neigh.veth1.gc_stale_time)"))
goto fail;
SYS(fail, "ip addr add %s/64 dev veth1 nodad", IPV6_IFACE_ADDR);
SYS(fail, "ip neigh add %s dev veth1 nud failed", IPV6_NUD_FAILED_ADDR);
SYS(fail, "ip neigh add %s dev veth1 lladdr %s nud stale", IPV6_NUD_STALE_ADDR, DMAC);
SYS(fail, "ip addr add %s/24 dev veth1", IPV4_IFACE_ADDR);
SYS(fail, "ip neigh add %s dev veth1 nud failed", IPV4_NUD_FAILED_ADDR);
SYS(fail, "ip neigh add %s dev veth1 lladdr %s nud stale", IPV4_NUD_STALE_ADDR, DMAC);
/* Setup for prefsrc IP addr selection */
SYS(fail, "ip addr add %s/24 dev veth1", IPV4_IFACE_ADDR_SEC);
SYS(fail, "ip route add %s/32 dev veth1 src %s", IPV4_ADDR_DST, IPV4_IFACE_ADDR_SEC);
SYS(fail, "ip addr add %s/64 dev veth1 nodad", IPV6_IFACE_ADDR_SEC);
SYS(fail, "ip route add %s/128 dev veth1 src %s", IPV6_ADDR_DST, IPV6_IFACE_ADDR_SEC);
/* Setup for tbid lookup tests */
SYS(fail, "ip addr add %s/24 dev veth2", IPV4_TBID_ADDR);
SYS(fail, "ip route del %s/24 dev veth2", IPV4_TBID_NET);
SYS(fail, "ip route add table 100 %s/24 dev veth2", IPV4_TBID_NET);
SYS(fail, "ip neigh add %s dev veth2 lladdr %s nud stale", IPV4_TBID_DST, DMAC2);
SYS(fail, "ip addr add %s/64 dev veth2", IPV6_TBID_ADDR);
SYS(fail, "ip -6 route del %s/64 dev veth2", IPV6_TBID_NET);
SYS(fail, "ip -6 route add table 100 %s/64 dev veth2", IPV6_TBID_NET);
SYS(fail, "ip neigh add %s dev veth2 lladdr %s nud stale", IPV6_TBID_DST, DMAC2);
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 struct fib_lookup_test *test)
{
int ret;
memset(params, 0, sizeof(*params));
params->l4_protocol = IPPROTO_TCP;
params->ifindex = ifindex;
params->tbid = test->tbid;
if (inet_pton(AF_INET6, test->daddr, params->ipv6_dst) == 1) {
params->family = AF_INET6;
if (!(test->lookup_flags & BPF_FIB_LOOKUP_SRC)) {
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, test->daddr, ¶ms->ipv4_dst);
if (!ASSERT_EQ(ret, 1, "convert IP[46] address"))
return -1;
params->family = AF_INET;
if (!(test->lookup_flags & BPF_FIB_LOOKUP_SRC)) {
ret = inet_pton(AF_INET, IPV4_IFACE_ADDR, ¶ms->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]);
}
static void assert_src_ip(struct bpf_fib_lookup *fib_params, const char *expected_src)
{
int ret;
__u32 src6[4];
__be32 src4;
switch (fib_params->family) {
case AF_INET6:
ret = inet_pton(AF_INET6, expected_src, src6);
ASSERT_EQ(ret, 1, "inet_pton(expected_src)");
ret = memcmp(src6, fib_params->ipv6_src, sizeof(fib_params->ipv6_src));
if (!ASSERT_EQ(ret, 0, "fib_lookup ipv6 src")) {
char str_src6[64];
inet_ntop(AF_INET6, fib_params->ipv6_src, str_src6,
sizeof(str_src6));
printf("ipv6 expected %s actual %s ", expected_src,
str_src6);
}
break;
case AF_INET:
ret = inet_pton(AF_INET, expected_src, &src4);
ASSERT_EQ(ret, 1, "inet_pton(expected_src)");
ASSERT_EQ(fib_params->ipv4_src, src4, "fib_lookup ipv4 src");
break;
default:
PRINT_FAIL("invalid addr family: %d", fib_params->family);
}
}
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(fail, "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 ", tests[i].desc);
if (set_lookup_params(fib_params, &tests[i]))
continue;
skel->bss->fib_lookup_ret = -1;
skel->bss->lookup_flags = 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(skel->bss->fib_lookup_ret, tests[i].expected_ret,
"fib_lookup_ret");
if (tests[i].expected_src)
assert_src_ip(fib_params, tests[i].expected_src);
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 ", expected, actual);
}
// ensure tbid is zero'd out after fib lookup.
if (tests[i].lookup_flags & BPF_FIB_LOOKUP_DIRECT) {
if (!ASSERT_EQ(skel->bss->fib_params.tbid, 0,
"expected fib_params.tbid to be zero"))
goto fail;
}
}
fail:
if (nstoken)
close_netns(nstoken);
SYS_NOFAIL("ip netns del " NS_TEST " &> /dev/null");
fib_lookup__destroy(skel);
}
|
