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
|
// SPDX-License-Identifier: GPL-2.0
#include <test_progs.h>
#include <network_helpers.h>
static void test_xdp_adjust_tail_shrink(void)
{
const char *file = "./test_xdp_adjust_tail_shrink.bpf.o";
__u32 expect_sz;
struct bpf_object *obj;
int err, prog_fd;
char buf[128];
LIBBPF_OPTS(bpf_test_run_opts, topts,
.data_in = &pkt_v4,
.data_size_in = sizeof(pkt_v4),
.data_out = buf,
.data_size_out = sizeof(buf),
.repeat = 1,
);
err = bpf_prog_test_load(file, BPF_PROG_TYPE_XDP, &obj, &prog_fd);
if (!ASSERT_OK(err, "test_xdp_adjust_tail_shrink"))
return;
err = bpf_prog_test_run_opts(prog_fd, &topts);
ASSERT_OK(err, "ipv4");
ASSERT_EQ(topts.retval, XDP_DROP, "ipv4 retval");
expect_sz = sizeof(pkt_v6) - 20; /* Test shrink with 20 bytes */
topts.data_in = &pkt_v6;
topts.data_size_in = sizeof(pkt_v6);
topts.data_size_out = sizeof(buf);
err = bpf_prog_test_run_opts(prog_fd, &topts);
ASSERT_OK(err, "ipv6");
ASSERT_EQ(topts.retval, XDP_TX, "ipv6 retval");
ASSERT_EQ(topts.data_size_out, expect_sz, "ipv6 size");
bpf_object__close(obj);
}
static void test_xdp_adjust_tail_grow(void)
{
const char *file = "./test_xdp_adjust_tail_grow.bpf.o";
struct bpf_object *obj;
char buf[4096]; /* avoid segfault: large buf to hold grow results */
__u32 expect_sz;
int err, prog_fd;
LIBBPF_OPTS(bpf_test_run_opts, topts,
.data_in = &pkt_v4,
.data_size_in = sizeof(pkt_v4),
.data_out = buf,
.data_size_out = sizeof(buf),
.repeat = 1,
);
err = bpf_prog_test_load(file, BPF_PROG_TYPE_XDP, &obj, &prog_fd);
if (!ASSERT_OK(err, "test_xdp_adjust_tail_grow"))
return;
err = bpf_prog_test_run_opts(prog_fd, &topts);
ASSERT_OK(err, "ipv4");
ASSERT_EQ(topts.retval, XDP_DROP, "ipv4 retval");
expect_sz = sizeof(pkt_v6) + 40; /* Test grow with 40 bytes */
topts.data_in = &pkt_v6;
topts.data_size_in = sizeof(pkt_v6);
topts.data_size_out = sizeof(buf);
err = bpf_prog_test_run_opts(prog_fd, &topts);
ASSERT_OK(err, "ipv6");
ASSERT_EQ(topts.retval, XDP_TX, "ipv6 retval");
ASSERT_EQ(topts.data_size_out, expect_sz, "ipv6 size");
bpf_object__close(obj);
}
static void test_xdp_adjust_tail_grow2(void)
{
const char *file = "./test_xdp_adjust_tail_grow.bpf.o";
char buf[4096]; /* avoid segfault: large buf to hold grow results */
struct bpf_object *obj;
int err, cnt, i;
int max_grow, prog_fd;
/* SKB_DATA_ALIGN(sizeof(struct skb_shared_info)) */
#if defined(__s390x__)
int tailroom = 512;
#else
int tailroom = 320;
#endif
LIBBPF_OPTS(bpf_test_run_opts, tattr,
.repeat = 1,
.data_in = &buf,
.data_out = &buf,
.data_size_in = 0, /* Per test */
.data_size_out = 0, /* Per test */
);
err = bpf_prog_test_load(file, BPF_PROG_TYPE_XDP, &obj, &prog_fd);
if (!ASSERT_OK(err, "test_xdp_adjust_tail_grow"))
return;
/* Test case-64 */
memset(buf, 1, sizeof(buf));
tattr.data_size_in = 64; /* Determine test case via pkt size */
tattr.data_size_out = 128; /* Limit copy_size */
/* Kernel side alloc packet memory area that is zero init */
err = bpf_prog_test_run_opts(prog_fd, &tattr);
ASSERT_EQ(errno, ENOSPC, "case-64 errno"); /* Due limit copy_size in bpf_test_finish */
ASSERT_EQ(tattr.retval, XDP_TX, "case-64 retval");
ASSERT_EQ(tattr.data_size_out, 192, "case-64 data_size_out"); /* Expected grow size */
/* Extra checks for data contents */
ASSERT_EQ(buf[0], 1, "case-64-data buf[0]"); /* 0-63 memset to 1 */
ASSERT_EQ(buf[63], 1, "case-64-data buf[63]");
ASSERT_EQ(buf[64], 0, "case-64-data buf[64]"); /* 64-127 memset to 0 */
ASSERT_EQ(buf[127], 0, "case-64-data buf[127]");
ASSERT_EQ(buf[128], 1, "case-64-data buf[128]"); /* 128-191 memset to 1 */
ASSERT_EQ(buf[191], 1, "case-64-data buf[191]");
/* Test case-128 */
memset(buf, 2, sizeof(buf));
tattr.data_size_in = 128; /* Determine test case via pkt size */
tattr.data_size_out = sizeof(buf); /* Copy everything */
err = bpf_prog_test_run_opts(prog_fd, &tattr);
max_grow = 4096 - XDP_PACKET_HEADROOM - tailroom; /* 3520 */
ASSERT_OK(err, "case-128");
ASSERT_EQ(tattr.retval, XDP_TX, "case-128 retval");
ASSERT_EQ(tattr.data_size_out, max_grow, "case-128 data_size_out"); /* Expect max grow */
/* Extra checks for data content: Count grow size, will contain zeros */
for (i = 0, cnt = 0; i < sizeof(buf); i++) {
if (buf[i] == 0)
cnt++;
}
ASSERT_EQ(cnt, max_grow - tattr.data_size_in, "case-128-data cnt"); /* Grow increase */
ASSERT_EQ(tattr.data_size_out, max_grow, "case-128-data data_size_out"); /* Total grow */
bpf_object__close(obj);
}
static void test_xdp_adjust_frags_tail_shrink(void)
{
const char *file = "./test_xdp_adjust_tail_shrink.bpf.o";
__u32 exp_size;
struct bpf_program *prog;
struct bpf_object *obj;
int err, prog_fd;
__u8 *buf;
LIBBPF_OPTS(bpf_test_run_opts, topts);
/* For the individual test cases, the first byte in the packet
* indicates which test will be run.
*/
obj = bpf_object__open(file);
if (libbpf_get_error(obj))
return;
prog = bpf_object__next_program(obj, NULL);
if (bpf_object__load(obj))
return;
prog_fd = bpf_program__fd(prog);
buf = malloc(9000);
if (!ASSERT_OK_PTR(buf, "alloc buf 9Kb"))
goto out;
memset(buf, 0, 9000);
/* Test case removing 10 bytes from last frag, NOT freeing it */
exp_size = 8990; /* 9000 - 10 */
topts.data_in = buf;
topts.data_out = buf;
topts.data_size_in = 9000;
topts.data_size_out = 9000;
err = bpf_prog_test_run_opts(prog_fd, &topts);
ASSERT_OK(err, "9Kb-10b");
ASSERT_EQ(topts.retval, XDP_TX, "9Kb-10b retval");
ASSERT_EQ(topts.data_size_out, exp_size, "9Kb-10b size");
/* Test case removing one of two pages, assuming 4K pages */
buf[0] = 1;
exp_size = 4900; /* 9000 - 4100 */
topts.data_size_out = 9000; /* reset from previous invocation */
err = bpf_prog_test_run_opts(prog_fd, &topts);
ASSERT_OK(err, "9Kb-4Kb");
ASSERT_EQ(topts.retval, XDP_TX, "9Kb-4Kb retval");
ASSERT_EQ(topts.data_size_out, exp_size, "9Kb-4Kb size");
/* Test case removing two pages resulting in a linear xdp_buff */
buf[0] = 2;
exp_size = 800; /* 9000 - 8200 */
topts.data_size_out = 9000; /* reset from previous invocation */
err = bpf_prog_test_run_opts(prog_fd, &topts);
ASSERT_OK(err, "9Kb-9Kb");
ASSERT_EQ(topts.retval, XDP_TX, "9Kb-9Kb retval");
ASSERT_EQ(topts.data_size_out, exp_size, "9Kb-9Kb size");
free(buf);
out:
bpf_object__close(obj);
}
static void test_xdp_adjust_frags_tail_grow(void)
{
const char *file = "./test_xdp_adjust_tail_grow.bpf.o";
__u32 exp_size;
struct bpf_program *prog;
struct bpf_object *obj;
int err, i, prog_fd;
__u8 *buf;
LIBBPF_OPTS(bpf_test_run_opts, topts);
obj = bpf_object__open(file);
if (libbpf_get_error(obj))
return;
prog = bpf_object__next_program(obj, NULL);
if (bpf_object__load(obj))
return;
prog_fd = bpf_program__fd(prog);
buf = malloc(16384);
if (!ASSERT_OK_PTR(buf, "alloc buf 16Kb"))
goto out;
/* Test case add 10 bytes to last frag */
memset(buf, 1, 16384);
exp_size = 9000 + 10;
topts.data_in = buf;
topts.data_out = buf;
topts.data_size_in = 9000;
topts.data_size_out = 16384;
err = bpf_prog_test_run_opts(prog_fd, &topts);
ASSERT_OK(err, "9Kb+10b");
ASSERT_EQ(topts.retval, XDP_TX, "9Kb+10b retval");
ASSERT_EQ(topts.data_size_out, exp_size, "9Kb+10b size");
for (i = 0; i < 9000; i++)
ASSERT_EQ(buf[i], 1, "9Kb+10b-old");
for (i = 9000; i < 9010; i++)
ASSERT_EQ(buf[i], 0, "9Kb+10b-new");
for (i = 9010; i < 16384; i++)
ASSERT_EQ(buf[i], 1, "9Kb+10b-untouched");
/* Test a too large grow */
memset(buf, 1, 16384);
exp_size = 9001;
topts.data_in = topts.data_out = buf;
topts.data_size_in = 9001;
topts.data_size_out = 16384;
err = bpf_prog_test_run_opts(prog_fd, &topts);
ASSERT_OK(err, "9Kb+10b");
ASSERT_EQ(topts.retval, XDP_DROP, "9Kb+10b retval");
ASSERT_EQ(topts.data_size_out, exp_size, "9Kb+10b size");
free(buf);
out:
bpf_object__close(obj);
}
void test_xdp_adjust_tail(void)
{
if (test__start_subtest("xdp_adjust_tail_shrink"))
test_xdp_adjust_tail_shrink();
if (test__start_subtest("xdp_adjust_tail_grow"))
test_xdp_adjust_tail_grow();
if (test__start_subtest("xdp_adjust_tail_grow2"))
test_xdp_adjust_tail_grow2();
if (test__start_subtest("xdp_adjust_frags_tail_shrink"))
test_xdp_adjust_frags_tail_shrink();
if (test__start_subtest("xdp_adjust_frags_tail_grow"))
test_xdp_adjust_frags_tail_grow();
}
|
