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/*
* 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");
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