Question

在收发器模式下，我想丢弃所有数据包，除了那些来自一个特定MAC地址的数据包。我正确地应用了NWP过滤器程序，虽然我收到所有数据包。

这是代码。

1）创建过滤方法。

static int CreateFilters() {

long lRetVal;

SlrxFilterID_t FilterId = 0;

SlrxFilterRuleType_t RuleType;

SlrxFilterFlags_t FilterFlags;

SlrxFilterRule_t Rule;

SlrxFilterTrigger_t Trigger;

SlrxFilterAction_t Action;

unsigned char ucMacMask[6] = { 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF };

//unsigned char ucIPMask[4] = { 0xFF, 0xFF, 0xFF, 0xFF };

/*************************************************************************/

/* Build filter to drop incoming packets according to source MAC address */

/*************************************************************************/

//

//define filter as parent

//

Trigger.ParentFilterID = 0;

//

//no trigger to activate the filter.

//

Trigger.Trigger = NO_TRIGGER;

//

//connection state and role

//

Trigger.TriggerArgConnectionState.IntRepresentation = \

RX_FILTER_CONNECTION_STATE_STA_NOT_CONNECTED;

Trigger.TriggerArgRoleStatus.IntRepresentation = RX_FILTER_ROLE_PROMISCUOUS;

//

// header and Combination types are only supported. Combination for logical

// AND/OR between two filters

//

RuleType = HEADER;

Rule.HeaderType.RuleHeaderfield = MAC_DST_ADDRESS_FIELD;

memcpy(

Rule.HeaderType.RuleHeaderArgsAndMask.RuleHeaderArgs.RxFilterDB6BytesRuleArgs[0],

g_ucMacAddress, SL_MAC_ADDR_LEN);

memcpy(Rule.HeaderType.RuleHeaderArgsAndMask.RuleHeaderArgsMask, ucMacMask,

SL_MAC_ADDR_LEN);

Rule.HeaderType.RuleCompareFunc = COMPARE_FUNC_NOT_EQUAL_TO;

//

//Action

//

Action.ActionType.IntRepresentation = RX_FILTER_ACTION_DROP;

FilterFlags.IntRepresentation = RX_FILTER_BINARY;

lRetVal = sl_WlanRxFilterAdd(RuleType, FilterFlags, &Rule, &Trigger,

&Action, &FilterId);

ASSERT_ON_ERROR(lRetVal);

return 0;

}

2）启用所有过滤器。

signed long EnableAllFilters() {

signed long lRetVal = -1;

_WlanRxFilterOperationCommandBuff_t RxFilterIdMask;

//

//Enable all 64 filters (8*8) - bit=1 represents enabled filter

//

memset(RxFilterIdMask.FilterIdMask, 0xFF, 8);

lRetVal = sl_WlanRxFilterSet( SL_ENABLE_DISABLE_RX_FILTER,

(unsigned char *) &RxFilterIdMask,

sizeof(_WlanRxFilterOperationCommandBuff_t));

return lRetVal;

}

3）接收数据包的方法。

int iSoc;

char acBuffer[1500];

int iIndex, channelnumber;

long lRetVal = -1;

struct SlTimeval_t timeval;

TransceiverRxOverHead_t *frameRadioHeader = NULL;

timeval.tv_sec = 0; // Seconds

timeval.tv_usec = 20000; // Microseconds.

UART_PRINT(

"\n\rListerning to all channel to listen[1-13] for five entries:");

for (channelnumber = 8; channelnumber < 9; channelnumber++) {

lRetVal = CreateFilters();

if (lRetVal < 0) {

UART_PRINT("Filter creation failed\n\r");

LOOP_FOREVER()

;

}

//

// Activate pre-defined filters - The filters will be deleted upon reset

//

if (EnableAllFilters() < 0) {

UART_PRINT("Unable to enable filter \n\r");

LOOP_FOREVER()

;

}

UART_PRINT("\n\r");

UART_PRINT("\n\rListerning to channel number %d=:", channelnumber);

iSoc = sl_Socket(SL_AF_RF, SL_SOCK_RAW, channelnumber);

ASSERT_ON_ERROR(iSoc);

// Enable receive timeout

lRetVal = sl_SetSockOpt(iSoc, SL_SOL_SOCKET, SL_SO_RCVTIMEO, &timeval,

sizeof(timeval));

ASSERT_ON_ERROR(lRetVal);

int k;

for (k = 0; k < 50; k++) {

lRetVal = sl_Recv(iSoc, acBuffer, 1500, 0);

if (lRetVal < 0 && lRetVal != SL_EAGAIN) {

//error

ASSERT_ON_ERROR(sl_Close(iSoc));

ASSERT_ON_ERROR(lRetVal);

}

frameRadioHeader = (TransceiverRxOverHead_t *) acBuffer;

UART_PRINT(" \n\r===>>> Timestamp: %iuS, Signal Strength: %idB\n\r",

frameRadioHeader->timestamp, frameRadioHeader->rssi);

UART_PRINT(

" \n\r===>>> Destination MAC Address: %02x:%02x:%02x:%02x:%02x:%02x\n\r",

acBuffer[12], acBuffer[13], acBuffer[14], acBuffer[15],

acBuffer[16], acBuffer[17]);

UART_PRINT(

" \n\r===>>> Source MAC Address: %02x:%02x:%02x:%02x:%02x:%02x\n\r",

acBuffer[24], acBuffer[25], acBuffer[26], acBuffer[27],

acBuffer[28], acBuffer[29]);

UART_PRINT(" \n\r===>>> Source IP Address: %d.%d.%d.%d\n\r",

acBuffer[54], acBuffer[55], acBuffer[56], acBuffer[57]);

UART_PRINT(" \n\r===>>> Destination IP Address: %d.%d.%d.%d\n\r",

acBuffer[58], acBuffer[59], acBuffer[60], acBuffer[61]);

UART_PRINT("\n\r");

}

//

//Close the socket

//

lRetVal = sl_Close(iSoc);

}

ASSERT_ON_ERROR(lRetVal);

return SUCCESS;

}

任何帮助都将受到高度赞赏。

感谢。

Answer 1

根据您的代码

unsigned char ucMacMask[6] = { 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF };

Rule.HeaderType.RuleHeaderfield = MAC_DST_ADDRESS_FIELD;

Rule.HeaderType.RuleCompareFunc = COMPARE_FUNC_NOT_EQUAL_TO;

结果是

的数据包

DST_MAC_ADDR != ucMacMask

将收到。

因此，您获取所有数据包，因为它们的目标mac addr不等于{0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF}。

例如，你可以尝试这个

unsigned char ucMacMask[6] = { 0x04, 0x4B, 0xED, 0x3C, 0x89, 0x14 };

Rule.HeaderType.RuleHeaderfield = MAC_SRC_ADDRESS_FIELD;

Rule.HeaderType.RuleCompareFunc = COMPARE_FUNC_EQUAL;

所以，你只能接收数据包

那些来自一个特定的MAC地址

（这里是0x04,0x4B，0xED，0x3C，0x89,0x14，你可以自己设置）。

Answer 2

@ Mitulkumar Patel （太久不能发表评论）两行代码的说明（在Mitulkumar Patel的评论中回答问题）：

＆＃34; memcpy＆＃34;函数副本n字节构成内存A到B.第一行是n=SL_MAC_ADDR_LEN，A=g_ucMacAddress，B=Rule.HeaderType.RuleHeaderArgsAndMask.RuleHeaderArgs.RxFilterDB6BytesRul‌eArgs[0]。注意：您需要确认g_ucMacAddress是否是内存地址（谁拥有该mac地址）？如果g_ucMacAddress不是内存地址，则需要使用：＆＃34; &g_ucMacAddress＆＃34;而不是＆＃34; g_ucMacAddress＆＃34;在第一行。该行用于设置Rx过滤模块的mac地址。

第二行是设置mac地址掩码。这是在您传入数据包中的源MAC地址和g_ucMacAddress相等之前，此操作src_mac_addr & ucMacMask将首先完成。

Rx-Filter CC3200 [TI]收发器模式：未获得过滤结果

2 个答案: