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/* SPDX-License-Identifier: GPL-2.0
*
* Copyright (C) 2015-2021 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
*/
#include "messages.h"
#define IS_BEFORE_UNBIASED_INTERRUPT_TIME(A) ((LONG64)(A) < (LONG64)KeQueryUnbiasedInterruptTime())
static UINT64
MaximumSysTimeUnitsAtIndex(LONG Index);
static NTSTATUS
TimingsTest(IPV4HDR *Hdr4, IPV6HDR *Hdr6, LONG *Test);
static NTSTATUS
CapacityTest(IPV4HDR *Hdr4, LONG *Test);
#ifdef ALLOC_PRAGMA
# pragma alloc_text(INIT, MaximumSysTimeUnitsAtIndex)
# pragma alloc_text(INIT, TimingsTest)
# pragma alloc_text(INIT, CapacityTest)
# pragma alloc_text(INIT, RatelimiterSelftest)
#endif
#pragma data_seg("INITDATA")
#pragma bss_seg("INITBSS")
static CONST struct
{
BOOLEAN Failure;
ULONG64 SysTimeUnitsToSleepBefore;
} ExpectedResults[] = { [PACKETS_BURSTABLE] = { TRUE, 0 },
[PACKETS_BURSTABLE + 1] = { FALSE, SYS_TIME_UNITS_PER_SEC / PACKETS_PER_SECOND },
[PACKETS_BURSTABLE + 2] = { TRUE, 0 },
[PACKETS_BURSTABLE + 3] = { FALSE, 2 * SYS_TIME_UNITS_PER_SEC / PACKETS_PER_SECOND },
[PACKETS_BURSTABLE + 4] = { FALSE, 0 },
[PACKETS_BURSTABLE + 5] = { TRUE, 0 } };
#pragma data_seg()
#pragma bss_seg()
static UINT64
MaximumSysTimeUnitsAtIndex(LONG Index)
{
ULONG64 Total = 2 * SYS_TIME_UNITS_PER_SEC / PACKETS_PER_SECOND / 3;
LONG i;
for (i = 0; i <= Index; ++i)
Total += ExpectedResults[i].SysTimeUnitsToSleepBefore;
return Total;
}
#define IN6_NIBBLE(A, i) (((ULONG *)(A))[i])
static NTSTATUS
TimingsTest(IPV4HDR *Hdr4, IPV6HDR *Hdr6, LONG *Test)
{
ULONG64 LoopStartTime;
LONG i;
SOCKADDR_IN Src4 = { .sin_family = AF_INET, .sin_addr.S_un.S_addr = Hdr4->Saddr };
SOCKADDR_IN6 Src6 = { .sin6_family = AF_INET6, .sin6_addr = Hdr6->Saddr };
RatelimiterGcEntries(NULL);
RcuBarrier();
LoopStartTime = KeQueryUnbiasedInterruptTime();
for (i = 0; i < ARRAYSIZE(ExpectedResults); ++i)
{
if (ExpectedResults[i].SysTimeUnitsToSleepBefore)
KeDelayExecutionThread(
KernelMode,
FALSE,
&(LARGE_INTEGER){ .QuadPart = -(LONG64)ExpectedResults[i].SysTimeUnitsToSleepBefore });
if (IS_BEFORE_UNBIASED_INTERRUPT_TIME(LoopStartTime + MaximumSysTimeUnitsAtIndex(i)))
return STATUS_TIMEOUT;
if (RatelimiterAllow((SOCKADDR *)&Src4) == ExpectedResults[i].Failure)
return STATUS_DISK_FULL;
++(*Test);
Src4.sin_addr.s_addr = Hdr4->Saddr = Htonl(Ntohl(Hdr4->Saddr) + i + 1);
if (IS_BEFORE_UNBIASED_INTERRUPT_TIME(LoopStartTime + MaximumSysTimeUnitsAtIndex(i)))
return STATUS_TIMEOUT;
if (!RatelimiterAllow((SOCKADDR *)&Src4))
return STATUS_DISK_FULL;
++(*Test);
Src4.sin_addr.s_addr = Hdr4->Saddr = Htonl(Ntohl(Hdr4->Saddr) - i - 1);
IN6_NIBBLE(&Src6.sin6_addr, 2) = IN6_NIBBLE(&Hdr6->Saddr, 2) = Htonl(i);
IN6_NIBBLE(&Src6.sin6_addr, 3) = IN6_NIBBLE(&Hdr6->Saddr, 3) = Htonl(i);
if (IS_BEFORE_UNBIASED_INTERRUPT_TIME(LoopStartTime + MaximumSysTimeUnitsAtIndex(i)))
return STATUS_TIMEOUT;
if (RatelimiterAllow((SOCKADDR *)&Src6) == ExpectedResults[i].Failure)
return STATUS_DISK_FULL;
++(*Test);
IN6_NIBBLE(&Src6.sin6_addr, 0) = IN6_NIBBLE(&Hdr6->Saddr, 0) =
Htonl(Ntohl(IN6_NIBBLE(&Hdr6->Saddr, 0)) + i + 1);
if (IS_BEFORE_UNBIASED_INTERRUPT_TIME(LoopStartTime + MaximumSysTimeUnitsAtIndex(i)))
return STATUS_TIMEOUT;
if (!RatelimiterAllow((SOCKADDR *)&Src6))
return STATUS_DISK_FULL;
++(*Test);
IN6_NIBBLE(&Src6.sin6_addr, 0) = IN6_NIBBLE(&Hdr6->Saddr, 0) =
Htonl(Ntohl(IN6_NIBBLE(&Hdr6->Saddr, 0)) - i - 1);
if (IS_BEFORE_UNBIASED_INTERRUPT_TIME(LoopStartTime + MaximumSysTimeUnitsAtIndex(i)))
return STATUS_TIMEOUT;
}
return STATUS_SUCCESS;
}
static NTSTATUS
CapacityTest(IPV4HDR *Hdr4, LONG *Test)
{
ULONG i;
SOCKADDR_IN Src4 = { .sin_family = AF_INET, .sin_addr.S_un.S_addr = Hdr4->Saddr };
RatelimiterGcEntries(NULL);
RcuBarrier();
if (ReadNoFence(&TotalEntries))
return STATUS_DISK_FULL;
++(*Test);
for (i = 0; i <= MAX_ENTRIES; ++i)
{
Src4.sin_addr.s_addr = Hdr4->Saddr = Htonl(i);
if (RatelimiterAllow((SOCKADDR *)&Src4) != (i != MAX_ENTRIES))
return STATUS_DISK_FULL;
++(*Test);
}
return STATUS_SUCCESS;
}
_Use_decl_annotations_
BOOLEAN
RatelimiterSelftest(VOID)
{
enum
{
TRIALS_BEFORE_GIVING_UP = 5000
};
BOOLEAN Success = FALSE;
LONG Test = 0, Trials;
NET_BUFFER_LIST *Nbl4, *Nbl6 = NULL;
IPV4HDR *Hdr4;
IPV6HDR *Hdr6 = NULL;
++Test;
++Test;
++Test;
Nbl4 = MemAllocateNetBufferList(0, sizeof(*Hdr4), 0);
if (!Nbl4)
goto out;
NdisSetNblFlag(Nbl4, NDIS_NBL_FLAGS_IS_IPV4);
NET_BUFFER_LIST_INFO(Nbl4, NetBufferListProtocolId) = (VOID *)Htons(NDIS_ETH_TYPE_IPV4);
Hdr4 = MemGetValidatedNetBufferListData(Nbl4);
Hdr4->Saddr = Htonl(8182);
++Test;
Nbl6 = MemAllocateNetBufferList(0, sizeof(*Hdr6), 0);
if (!Nbl6)
{
MemFreeNetBufferList(Nbl4);
goto out;
}
NdisSetNblFlag(Nbl6, NDIS_NBL_FLAGS_IS_IPV6);
NET_BUFFER_LIST_INFO(Nbl6, NetBufferListProtocolId) = (VOID *)Htons(NDIS_ETH_TYPE_IPV6);
Hdr6 = MemGetValidatedNetBufferListData(Nbl6);
IN6_NIBBLE(&Hdr6->Saddr, 0) = Htonl(1212);
IN6_NIBBLE(&Hdr6->Saddr, 1) = Htonl(289188);
++Test;
for (Trials = TRIALS_BEFORE_GIVING_UP;;)
{
LONG TestCount = 0;
NTSTATUS Ret;
Ret = TimingsTest(Hdr4, Hdr6, &TestCount);
if (Ret == STATUS_TIMEOUT)
{
if (!Trials--)
{
Test += TestCount;
goto cleanup;
}
KeDelayExecutionThread(KernelMode, FALSE, &(LARGE_INTEGER){ .QuadPart = -SYS_TIME_UNITS_PER_SEC / 2 });
continue;
}
else if (!NT_SUCCESS(Ret))
{
Test += TestCount;
goto cleanup;
}
else
{
Test += TestCount;
break;
}
}
for (Trials = TRIALS_BEFORE_GIVING_UP;;)
{
LONG TestCount = 0;
if (!NT_SUCCESS(CapacityTest(Hdr4, &TestCount)))
{
if (!Trials--)
{
Test += TestCount;
goto cleanup;
}
KeDelayExecutionThread(KernelMode, FALSE, &(LARGE_INTEGER){ .QuadPart = -SYS_TIME_UNITS_PER_SEC / 20 });
continue;
}
Test += TestCount;
break;
}
Success = TRUE;
cleanup:
MemFreeNetBufferList(Nbl4);
MemFreeNetBufferList(Nbl6);
out:
if (Success)
LogDebug("ratelimiter self-tests: pass");
else
LogDebug("ratelimiter self-test %d: FAIL", Test);
return Success;
}
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