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CC3200 SL_IPPROTO_RAW无法recv到IP RAW Packet,提示-11 (try again)

Jason Bao
Prodigy 62 points
Other Parts Discussed in Thread: CC3200

您好，TI工程师

我在CC3200 example code: getting_started_with_wlan_station

中有添加如下function 去sniffer IP layer的 RAW Pakcet,  但始终返回错误信息：[(PNum=×) recievedBytes= -11] :

查看-11 表示 try again ， 可以麻烦看下是哪里的不对吗？

我添加的function 是按照TI wiki 中描述里进行的

http://processors.wiki.ti.com/index.php/CC31xx_%26_CC32xx_Advanced_Networking

 

int RawSocketRx(int iNumberOfPackets)
{
    SlSockAddrIn_t  Addr;
    unsigned char *pbuf = NULL;
    int recievedBytes = 0;
    int AddrSize = 0;
    int lRetVal = -1;
    int iSoc = -1;
    const int flag = 1;

    struct SlTimeval_t timeval;
    timeval.tv_sec =  0;             // Seconds
    timeval.tv_usec = 20000;     // Microseconds. 10000 microseconds resoultion

    pbuf = (unsigned char*)malloc(BUFFER_SIZE);

    /* create a raw-socket following the instructions given above*/
    iSoc = sl_Socket(SL_AF_INET, SL_SOCK_RAW, SL_IPPROTO_RAW);

    lRetVal = sl_SetSockOpt(iSoc,SL_IPPROTO_IP,SL_IP_HDRINCL, &flag, sizeof(flag));
    ASSERT_ON_ERROR(__LINE__, lRetVal);
 
   lRetVal = sl_SetSockOpt(iSoc,SL_SOL_SOCKET,SL_SO_RCVTIMEO, &timeval, sizeof(timeval));
   ASSERT_ON_ERROR(__LINE__, lRetVal);

    Addr.sin_family = SL_AF_INET;
    Addr.sin_port = sl_Htons((unsigned short)0);
    Addr.sin_addr.s_addr = sl_Htonl(INADDR_ANY);
    AddrSize = sizeof(SlSockAddrIn_t);
   
    sl_Connect(iSoc, ( SlSockAddr_t *)&Addr, AddrSize);

    while(iNumberOfPackets--)
    {
        memset(pbuf, 0, BUFFER_SIZE);
        recievedBytes = sl_Recv (iSoc, pbuf, BUFFER_SIZE, 0);

      UART_PRINT("[(PNum=%d) recievedBytes= %d] : \n\r",  iNumberOfPackets,recievedBytes);
  DUMP(pbuf,recievedBytes);
    }
 
    sl_Close(iSoc);
    free(pbuf);
   
    return SUCCESS;
}

  • 0
    Prodigy 62 points

    今天 做了两个实验：

    1:    用SOCK_STREAM 的方式    可以recv 到从TCP server端 发送过来的数据，

       /* create a raw-socket following the instructions given above*/
        iSoc = sl_Socket(SL_AF_INET, SL_SOCK_STREAM, 0);

        Addr.sin_family = SL_AF_INET;
        Addr.sin_port = sl_Htons(1234);
        Addr.sin_addr.s_addr = sl_Htonl(0x0a0a0a64);  
        AddrSize = sizeof(SlSockAddrIn_t);
        
     lRetVal = sl_Connect(iSoc, ( SlSockAddr_t *)&Addr, AddrSize);
     if( lRetVal < 0 )
     {
            UART_PRINT("sl_Connect() Failed!\r\n");
           ASSERT_ON_ERROR(__LINE__, lRetVal);
     }

    2:  替换上面黄色区域的代码为如下内容

        /* create a raw-socket following the instructions given above*/
        iSoc = sl_Socket(SL_AF_INET, SL_SOCK_RAW, SL_IPPROTO_RAW);

        lRetVal = sl_SetSockOpt(iSoc,SL_IPPROTO_IP,SL_IP_HDRINCL, &flag, sizeof(flag));
        ASSERT_ON_ERROR(__LINE__, lRetVal);

    其他代码同test1 的一样，但第2次的改动，无法收到数据。

    所以判断代码中其他地方应该是OK的，差异只是在SL_SOK_RAW, SL_IPPROTO_RAW 这些type/protocol的选择上，  

    是否TI 工程师对此可以给出一些帮助呢，非常感谢！！

  • 0 回复 Jason Bao
    Prodigy 62 points

    自己先顶一下哈，

    请问是否有TI 工程师 可以帮忙看看呢？ Thanks!

  • 0 回复 Jason Bao
    TI__Mastermind 20826 points

    能否用这种方式试试看？

    struct timeval timeVal;

    g_RawPacketSD = sl_Socket( SL_AF_PACKET, SL_SOCK_RAW, 0 );
    if( g_RawPacketSD < 0 )
    {
    SEND_LOG_INFO("failed open RAW Packet socket \r\n");
    }

    timeVal.tv_sec = 0; /* Seconds */
    timeVal.tv_usec = 5000 ; /* Microseconds */

    sl_SetSockOpt( g_RawPacketSD, SL_SOL_SOCKET, SL_SO_RCVTIMEO, &timeVal, sizeof(timeVal) );

  • 0 回复 Yonghua Pan
    Prodigy 62 points

    Hi, YongHua

    Thanks a lot!    您帮了大忙， 这种方式试验是OK的。 谢谢！！

  • 0 回复 Yonghua Pan
    Prodigy 10 points

    你好，

    我照這個方式實作，會收到所有封包，導致連網頁也進不去，請問是否有方法可以只讀取特定封包，

    以下是程式片段

    iSock = sl_Socket(SL_AF_PACKET, SL_SOCK_RAW, 0);

    ...

    while (1) {

        SL_FD_ZERO(&ReadFds);

        SL_FD_SET(iSock, ReadFds);

        g_timeout.tv_sec = 1;

        g_timeout.tv_usec = 0;

        lRetVal = sl_Select(iSock + 1, &ReadFds, NULL, NULL, &g_timeout);

        if (0 < lRetVal && SL_FD_ISSET(iSock, &ReadFds)) {
                sl_Recv(iSock, cDataBuf, 14, 0);
                SL_FD_CLR(iSock, &ReadFds);

        }
    }

    謝謝

    Ken

  • 0 回复 Jason Bao
    Prodigy 40 points

    In linux man page http://linux.die.net/man/7/raw

    An IPPROTO_RAW socket is send only.

  • 0 回复 matianfu
    TI__Mastermind 20826 points

    CC3200的RAW也是可以接收的，不过不要用select去操作。