summaryrefslogtreecommitdiff
path: root/lib/test_bpf.c
blob: 9f25dc1273307c11dd1e77fead2127d323d1511d (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
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
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
/*
 * Testsuite for BPF interpreter and BPF JIT compiler
 *
 * Copyright (c) 2011-2014 PLUMgrid, http://plumgrid.com
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of version 2 of the GNU General Public
 * License as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * General Public License for more details.
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/init.h>
#include <linux/module.h>
#include <linux/filter.h>
#include <linux/skbuff.h>
#include <linux/netdevice.h>
#include <linux/if_vlan.h>

#define MAX_SUBTESTS	3
#define MAX_DATA	128
#define MAX_INSNS	512
#define MAX_K		0xffffFFFF

/* define few constants used to init test 'skb' */
#define SKB_TYPE	3
#define SKB_MARK	0x1234aaaa
#define SKB_HASH	0x1234aaab
#define SKB_QUEUE_MAP	123
#define SKB_VLAN_TCI	0xffff
#define SKB_DEV_IFINDEX	577
#define SKB_DEV_TYPE	588

/* redefine REGs to make tests less verbose */
#define R0 BPF_REG_0
#define R1 BPF_REG_1
#define R2 BPF_REG_2
#define R3 BPF_REG_3
#define R4 BPF_REG_4
#define R5 BPF_REG_5
#define R6 BPF_REG_6
#define R7 BPF_REG_7
#define R8 BPF_REG_8
#define R9 BPF_REG_9
#define R10 BPF_REG_10

struct bpf_test {
	const char *descr;
	union {
		struct sock_filter insns[MAX_INSNS];
		struct sock_filter_int insns_int[MAX_INSNS];
	};
	enum {
		NO_DATA,
		EXPECTED_FAIL,
		SKB,
		SKB_INT
	} data_type;
	__u8 data[MAX_DATA];
	struct {
		int data_size;
		__u32 result;
	} test[MAX_SUBTESTS];
};

static struct bpf_test tests[] = {
	{
		"TAX",
		.insns = {
			BPF_STMT(BPF_LD | BPF_IMM, 1),
			BPF_STMT(BPF_MISC | BPF_TAX, 0),
			BPF_STMT(BPF_LD | BPF_IMM, 2),
			BPF_STMT(BPF_ALU | BPF_ADD | BPF_X, 0),
			BPF_STMT(BPF_ALU | BPF_NEG, 0), /* A == -3 */
			BPF_STMT(BPF_MISC | BPF_TAX, 0),
			BPF_STMT(BPF_LD | BPF_LEN, 0),
			BPF_STMT(BPF_ALU | BPF_ADD | BPF_X, 0),
			BPF_STMT(BPF_MISC | BPF_TAX, 0), /* X == len - 3 */
			BPF_STMT(BPF_LD | BPF_B | BPF_IND, 1),
			BPF_STMT(BPF_RET | BPF_A, 0)
		},
		SKB,
		{ 10, 20, 30, 40, 50 },
		{ { 2, 10 }, { 3, 20 }, { 4, 30 } },
	},
	{
		"tcpdump port 22",
		.insns = {
			{ 0x28,  0,  0, 0x0000000c },
			{ 0x15,  0,  8, 0x000086dd },
			{ 0x30,  0,  0, 0x00000014 },
			{ 0x15,  2,  0, 0x00000084 },
			{ 0x15,  1,  0, 0x00000006 },
			{ 0x15,  0, 17, 0x00000011 },
			{ 0x28,  0,  0, 0x00000036 },
			{ 0x15, 14,  0, 0x00000016 },
			{ 0x28,  0,  0, 0x00000038 },
			{ 0x15, 12, 13, 0x00000016 },
			{ 0x15,  0, 12, 0x00000800 },
			{ 0x30,  0,  0, 0x00000017 },
			{ 0x15,  2,  0, 0x00000084 },
			{ 0x15,  1,  0, 0x00000006 },
			{ 0x15,  0,  8, 0x00000011 },
			{ 0x28,  0,  0, 0x00000014 },
			{ 0x45,  6,  0, 0x00001fff },
			{ 0xb1,  0,  0, 0x0000000e },
			{ 0x48,  0,  0, 0x0000000e },
			{ 0x15,  2,  0, 0x00000016 },
			{ 0x48,  0,  0, 0x00000010 },
			{ 0x15,  0,  1, 0x00000016 },
			{ 0x06,  0,  0, 0x0000ffff },
			{ 0x06,  0,  0, 0x00000000 },
		},
		SKB,
		/* 3c:07:54:43:e5:76 > 10:bf:48:d6:43:d6, ethertype IPv4(0x0800)
		 * length 114: 10.1.1.149.49700 > 10.1.2.10.22: Flags [P.],
		 * seq 1305692979:1305693027, ack 3650467037, win 65535,
		 * options [nop,nop,TS val 2502645400 ecr 3971138], length 48
		 */
		{ 0x10, 0xbf, 0x48, 0xd6, 0x43, 0xd6,
		  0x3c, 0x07, 0x54, 0x43, 0xe5, 0x76,
		  0x08, 0x00,
		  0x45, 0x10, 0x00, 0x64, 0x75, 0xb5,
		  0x40, 0x00, 0x40, 0x06, 0xad, 0x2e, /* IP header */
		  0x0a, 0x01, 0x01, 0x95, /* ip src */
		  0x0a, 0x01, 0x02, 0x0a, /* ip dst */
		  0xc2, 0x24,
		  0x00, 0x16 /* dst port */ },
		{ { 10, 0 }, { 30, 0 }, { 100, 65535 } },
	},
	{
		"INT: DIV + ABS",
		.insns_int = {
			BPF_ALU64_REG(BPF_MOV, R6, R1),
			BPF_LD_ABS(BPF_B, 3),
			BPF_ALU64_IMM(BPF_MOV, R2, 2),
			BPF_ALU32_REG(BPF_DIV, R0, R2),
			BPF_ALU64_REG(BPF_MOV, R8, R0),
			BPF_LD_ABS(BPF_B, 4),
			BPF_ALU64_REG(BPF_ADD, R8, R0),
			BPF_LD_IND(BPF_B, R8, -70),
			BPF_EXIT_INSN(),
		},
		SKB_INT,
		{ 10, 20, 30, 40, 50 },
		{ { 4, 0 }, { 5, 10 } }
	},
	{
		"check: missing ret",
		.insns = {
			BPF_STMT(BPF_LD | BPF_IMM, 1),
		},
		EXPECTED_FAIL,
		{ },
		{ }
	},
};

static int get_length(struct sock_filter *fp)
{
	int len = 0;

	while (fp->code != 0 || fp->k != 0) {
		fp++;
		len++;
	}

	return len;
}

struct net_device dev;
struct sk_buff *populate_skb(char *buf, int size)
{
	struct sk_buff *skb;

	if (size >= MAX_DATA)
		return NULL;

	skb = alloc_skb(MAX_DATA, GFP_KERNEL);
	if (!skb)
		return NULL;

	memcpy(__skb_put(skb, size), buf, size);
	skb_reset_mac_header(skb);
	skb->protocol = htons(ETH_P_IP);
	skb->pkt_type = SKB_TYPE;
	skb->mark = SKB_MARK;
	skb->hash = SKB_HASH;
	skb->queue_mapping = SKB_QUEUE_MAP;
	skb->vlan_tci = SKB_VLAN_TCI;
	skb->dev = &dev;
	skb->dev->ifindex = SKB_DEV_IFINDEX;
	skb->dev->type = SKB_DEV_TYPE;
	skb_set_network_header(skb, min(size, ETH_HLEN));

	return skb;
}

static int run_one(struct sk_filter *fp, struct bpf_test *t)
{
	u64 start, finish, res, cnt = 100000;
	int err_cnt = 0, err, i, j;
	u32 ret = 0;
	void *data;

	for (i = 0; i < MAX_SUBTESTS; i++) {
		if (t->test[i].data_size == 0 &&
		    t->test[i].result == 0)
			break;
		if (t->data_type == SKB ||
		    t->data_type == SKB_INT) {
			data = populate_skb(t->data, t->test[i].data_size);
			if (!data)
				return -ENOMEM;
		} else {
			data = NULL;
		}

		start = ktime_to_us(ktime_get());
		for (j = 0; j < cnt; j++)
			ret = SK_RUN_FILTER(fp, data);
		finish = ktime_to_us(ktime_get());

		res = (finish - start) * 1000;
		do_div(res, cnt);

		err = ret != t->test[i].result;
		if (!err)
			pr_cont("%lld ", res);

		if (t->data_type == SKB || t->data_type == SKB_INT)
			kfree_skb(data);

		if (err) {
			pr_cont("ret %d != %d ", ret, t->test[i].result);
			err_cnt++;
		}
	}

	return err_cnt;
}

static __init int test_bpf(void)
{
	struct sk_filter *fp, *fp_ext = NULL;
	struct sock_fprog fprog;
	int err, i, err_cnt = 0;

	for (i = 0; i < ARRAY_SIZE(tests); i++) {
		pr_info("#%d %s ", i, tests[i].descr);

		fprog.filter = tests[i].insns;
		fprog.len = get_length(fprog.filter);

		if (tests[i].data_type == SKB_INT) {
			fp_ext = kzalloc(4096, GFP_KERNEL);
			if (!fp_ext)
				return -ENOMEM;
			fp = fp_ext;
			memcpy(fp_ext->insns, tests[i].insns_int,
			       fprog.len * 8);
			fp->len = fprog.len;
			fp->bpf_func = sk_run_filter_int_skb;
		} else {
			err = sk_unattached_filter_create(&fp, &fprog);
			if (tests[i].data_type == EXPECTED_FAIL) {
				if (err == -EINVAL) {
					pr_cont("PASS\n");
					continue;
				} else {
					pr_cont("UNEXPECTED_PASS\n");
					/* verifier didn't reject the test
					 * that's bad enough, just return
					 */
					return -EINVAL;
				}
			}
			if (err) {
				pr_cont("FAIL to attach err=%d len=%d\n",
					err, fprog.len);
				return err;
			}
		}

		err = run_one(fp, &tests[i]);

		if (tests[i].data_type != SKB_INT)
			sk_unattached_filter_destroy(fp);
		else
			kfree(fp);

		if (err) {
			pr_cont("FAIL %d\n", err);
			err_cnt++;
		} else {
			pr_cont("PASS\n");
		}
	}

	if (err_cnt)
		return -EINVAL;
	else
		return 0;
}

static int __init test_bpf_init(void)
{
	return test_bpf();
}

static void __exit test_bpf_exit(void)
{
}

module_init(test_bpf_init);
module_exit(test_bpf_exit);
MODULE_LICENSE("GPL");