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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2015-2019 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);
}
static __init int timings_test(struct sk_buff *skb4, struct iphdr *hdr4,
struct sk_buff *skb6, struct ipv6hdr *hdr6,
int *test)
{
unsigned long loop_start_time;
int i;
wg_ratelimiter_gc_entries(NULL);
rcu_barrier();
loop_start_time = jiffies;
for (i = 0; i < ARRAY_SIZE(expected_results); ++i) {
if (expected_results[i].msec_to_sleep_before)
msleep(expected_results[i].msec_to_sleep_before);
if (time_is_before_jiffies(loop_start_time +
maximum_jiffies_at_index(i)))
return -ETIMEDOUT;
if (wg_ratelimiter_allow(skb4, &init_net) !=
expected_results[i].result)
return -EXFULL;
++(*test);
hdr4->saddr = htonl(ntohl(hdr4->saddr) + i + 1);
if (time_is_before_jiffies(loop_start_time +
maximum_jiffies_at_index(i)))
return -ETIMEDOUT;
if (!wg_ratelimiter_allow(skb4, &init_net))
return -EXFULL;
++(*test);
hdr4->saddr = htonl(ntohl(hdr4->saddr) - i - 1);
#if IS_ENABLED(CONFIG_IPV6)
hdr6->saddr.in6_u.u6_addr32[2] = htonl(i);
hdr6->saddr.in6_u.u6_addr32[3] = htonl(i);
if (time_is_before_jiffies(loop_start_time +
maximum_jiffies_at_index(i)))
return -ETIMEDOUT;
if (wg_ratelimiter_allow(skb6, &init_net) !=
expected_results[i].result)
return -EXFULL;
++(*test);
hdr6->saddr.in6_u.u6_addr32[0] =
htonl(ntohl(hdr6->saddr.in6_u.u6_addr32[0]) + i + 1);
if (time_is_before_jiffies(loop_start_time +
maximum_jiffies_at_index(i)))
return -ETIMEDOUT;
if (!wg_ratelimiter_allow(skb6, &init_net))
return -EXFULL;
++(*test);
hdr6->saddr.in6_u.u6_addr32[0] =
htonl(ntohl(hdr6->saddr.in6_u.u6_addr32[0]) - i - 1);
if (time_is_before_jiffies(loop_start_time +
maximum_jiffies_at_index(i)))
return -ETIMEDOUT;
#endif
}
return 0;
}
static __init int capacity_test(struct sk_buff *skb4, struct iphdr *hdr4,
int *test)
{
int i;
wg_ratelimiter_gc_entries(NULL);
rcu_barrier();
if (atomic_read(&total_entries))
return -EXFULL;
++(*test);
for (i = 0; i <= max_entries; ++i) {
hdr4->saddr = htonl(i);
if (wg_ratelimiter_allow(skb4, &init_net) != (i != max_entries))
return -EXFULL;
++(*test);
}
return 0;
}
bool __init wg_ratelimiter_selftest(void)
{
enum { TRIALS_BEFORE_GIVING_UP = 5000 };
bool success = false;
int test = 0, trials;
struct sk_buff *skb4, *skb6 = NULL;
struct iphdr *hdr4;
struct ipv6hdr *hdr6 = NULL;
if (IS_ENABLED(CONFIG_KASAN) || IS_ENABLED(CONFIG_UBSAN))
return true;
BUILD_BUG_ON(MSEC_PER_SEC % PACKETS_PER_SECOND != 0);
if (wg_ratelimiter_init())
goto out;
++test;
if (wg_ratelimiter_init()) {
wg_ratelimiter_uninit();
goto out;
}
++test;
if (wg_ratelimiter_init()) {
wg_ratelimiter_uninit();
wg_ratelimiter_uninit();
goto out;
}
++test;
skb4 = alloc_skb(sizeof(struct iphdr), GFP_KERNEL);
if (unlikely(!skb4))
goto err_nofree;
skb4->protocol = htons(ETH_P_IP);
hdr4 = (struct iphdr *)skb_put(skb4, sizeof(*hdr4));
hdr4->saddr = htonl(8182);
skb_reset_network_header(skb4);
++test;
#if IS_ENABLED(CONFIG_IPV6)
skb6 = alloc_skb(sizeof(struct ipv6hdr), GFP_KERNEL);
if (unlikely(!skb6)) {
kfree_skb(skb4);
goto err_nofree;
}
skb6->protocol = htons(ETH_P_IPV6);
hdr6 = (struct ipv6hdr *)skb_put(skb6, sizeof(*hdr6));
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
for (trials = TRIALS_BEFORE_GIVING_UP; IS_ENABLED(DEBUG_RATELIMITER_TIMINGS);) {
int test_count = 0, ret;
ret = timings_test(skb4, hdr4, skb6, hdr6, &test_count);
if (ret == -ETIMEDOUT) {
if (!trials--) {
test += test_count;
goto err;
}
continue;
} else if (ret < 0) {
test += test_count;
goto err;
} else {
test += test_count;
break;
}
}
for (trials = TRIALS_BEFORE_GIVING_UP;;) {
int test_count = 0;
if (capacity_test(skb4, hdr4, &test_count) < 0) {
if (!trials--) {
test += test_count;
goto err;
}
continue;
}
test += test_count;
break;
}
success = true;
err:
kfree_skb(skb4);
#if IS_ENABLED(CONFIG_IPV6)
kfree_skb(skb6);
#endif
err_nofree:
wg_ratelimiter_uninit();
wg_ratelimiter_uninit();
wg_ratelimiter_uninit();
/* Uninit one extra time to check underflow detection. */
wg_ratelimiter_uninit();
out:
if (success)
pr_info("ratelimiter self-tests: pass\n");
else
pr_err("ratelimiter self-test %d: FAIL\n", test);
return success;
}
#endif
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