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
|
/* SPDX-License-Identifier: GPL-2.0
*
* Copyright (C) 2015-2018 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
*/
#ifdef DEBUG
#include <linux/jiffies.h>
static const struct { bool result; unsigned int msec_to_sleep_before; } expected_results[] __initconst = {
[0 ... PACKETS_BURSTABLE - 1] = { true, 0 },
[PACKETS_BURSTABLE] = { false, 0 },
[PACKETS_BURSTABLE + 1] = { true, MSEC_PER_SEC / PACKETS_PER_SECOND },
[PACKETS_BURSTABLE + 2] = { false, 0 },
[PACKETS_BURSTABLE + 3] = { true, (MSEC_PER_SEC / PACKETS_PER_SECOND) * 2 },
[PACKETS_BURSTABLE + 4] = { true, 0 },
[PACKETS_BURSTABLE + 5] = { false, 0 }
};
static __init unsigned int maximum_jiffies_at_index(int index)
{
unsigned int total_msecs = 2 * MSEC_PER_SEC / PACKETS_PER_SECOND / 3;
int i;
for (i = 0; i <= index; ++i)
total_msecs += expected_results[i].msec_to_sleep_before;
return msecs_to_jiffies(total_msecs);
}
bool __init ratelimiter_selftest(void)
{
struct sk_buff *skb4;
struct iphdr *hdr4;
#if IS_ENABLED(CONFIG_IPV6)
struct sk_buff *skb6;
struct ipv6hdr *hdr6;
#endif
int i, test = 0, tries = 0, ret = false;
unsigned long loop_start_time;
BUILD_BUG_ON(MSEC_PER_SEC % PACKETS_PER_SECOND != 0);
if (ratelimiter_init())
goto out;
++test;
if (ratelimiter_init()) {
ratelimiter_uninit();
goto out;
}
++test;
if (ratelimiter_init()) {
ratelimiter_uninit();
ratelimiter_uninit();
goto out;
}
++test;
skb4 = alloc_skb(sizeof(struct iphdr), GFP_KERNEL);
if (!skb4)
goto err_nofree;
skb4->protocol = htons(ETH_P_IP);
hdr4 = (struct iphdr *)skb_put(skb4, sizeof(struct iphdr));
hdr4->saddr = htonl(8182);
skb_reset_network_header(skb4);
++test;
#if IS_ENABLED(CONFIG_IPV6)
skb6 = alloc_skb(sizeof(struct ipv6hdr), GFP_KERNEL);
if (!skb6) {
kfree_skb(skb4);
goto err_nofree;
}
skb6->protocol = htons(ETH_P_IPV6);
hdr6 = (struct ipv6hdr *)skb_put(skb6, sizeof(struct ipv6hdr));
hdr6->saddr.in6_u.u6_addr32[0] = htonl(1212);
hdr6->saddr.in6_u.u6_addr32[1] = htonl(289188);
skb_reset_network_header(skb6);
++test;
#endif
restart:
loop_start_time = jiffies;
for (i = 0; i < ARRAY_SIZE(expected_results); ++i) {
#define ensure_time do {\
if (time_is_before_jiffies(loop_start_time + maximum_jiffies_at_index(i))) { \
if (++tries >= 5000) \
goto err; \
gc_entries(NULL); \
rcu_barrier(); \
msleep(500); \
goto restart; \
}} while (0)
if (expected_results[i].msec_to_sleep_before)
msleep(expected_results[i].msec_to_sleep_before);
ensure_time;
if (ratelimiter_allow(skb4, &init_net) != expected_results[i].result)
goto err;
++test;
hdr4->saddr = htonl(ntohl(hdr4->saddr) + i + 1);
ensure_time;
if (!ratelimiter_allow(skb4, &init_net))
goto err;
++test;
hdr4->saddr = htonl(ntohl(hdr4->saddr) - i - 1);
#if IS_ENABLED(CONFIG_IPV6)
hdr6->saddr.in6_u.u6_addr32[2] = hdr6->saddr.in6_u.u6_addr32[3] = htonl(i);
ensure_time;
if (ratelimiter_allow(skb6, &init_net) != expected_results[i].result)
goto err;
++test;
hdr6->saddr.in6_u.u6_addr32[0] = htonl(ntohl(hdr6->saddr.in6_u.u6_addr32[0]) + i + 1);
ensure_time;
if (!ratelimiter_allow(skb6, &init_net))
goto err;
++test;
hdr6->saddr.in6_u.u6_addr32[0] = htonl(ntohl(hdr6->saddr.in6_u.u6_addr32[0]) - i - 1);
ensure_time;
#endif
}
gc_entries(NULL);
rcu_barrier();
if (atomic_read(&total_entries))
goto err;
++test;
for (i = 0; i <= max_entries; ++i) {
hdr4->saddr = htonl(i);
if (ratelimiter_allow(skb4, &init_net) != (i != max_entries))
goto err;
++test;
}
ret = true;
err:
kfree_skb(skb4);
#if IS_ENABLED(CONFIG_IPV6)
kfree_skb(skb6);
#endif
err_nofree:
ratelimiter_uninit();
ratelimiter_uninit();
ratelimiter_uninit();
/* Uninit one extra time to check underflow detection. */
ratelimiter_uninit();
out:
if (ret)
pr_info("ratelimiter self-tests: pass\n");
else
pr_info("ratelimiter self-test %d: fail\n", test);
return ret;
}
#endif
|
