getsockopt從setsockopt返回不同的IP_TOS值

我試圖用setsockopt將IPTOS的值設置爲IPTOS_THROUGHPUT。致電setsockopt致電0。但getsockopt顯示IP_TOS值設置爲1，這與IPTOS_THROUGHPUT（0x8）不同。有沒有人知道可能導致setsockopt和getsockopt中IPTOS值不匹配的原因？getsockopt從setsockopt返回不同的IP_TOS值

這裏的日誌輸出：

設置DSCP標記在插座26

在插座26 setsockopt的8個返回0

DSCP的插座26標記爲1，不同預期中的8

以下是代碼：

int iptos = IPTOS_THROUGHPUT; 

log(debug, 10, "Set DSCP Marking on socket %d\n", sockfd); 

retval = setsockopt(sockfd, IPPROTO_TCP, IP_TOS, &iptos, sizeof(iptos)); 
if (retval<0) { 
    log(error, 99, "Failed to set DSCP marking on socket %d with error %d\n", 
     sockfd, retval); 
} else { 
    log(debug, 10, "setsockopt on socket %d to %d returns %d\n", sockfd, iptos, 
     retval); 
    int tos=0; 
    socklen_t toslen=sizeof(tos); 

    retval = getsockopt(sockfd, IPPROTO_TCP, IP_TOS, &tos, &toslen); 
    if(retval<0) { 
     log(warning, 99, "Failed to get DSCP marking on socket %d with error %d\n", 
     sockfd, retval); 
    }else { 
     if(tos != iptos) { 
     log(warning, 99, "DSCP marking on socket %d is %d, different from expected %d\n", 
      sockfd, tos, iptos); 
     retval = 9999; 
     } 
     else { 
     log(debug, 10, "Success: Set DSCP Marking on socket %d to %d\n", 
      sockfd, iptos); 
     retval = 0; 
     } 
    } 
}

來源

2012-10-31 Fei Wan

您應該使用水平選項IPPROTO_IP而不是IPPROTO_TCP

來源

2012-10-31 17:29:38

非常感謝胡！那就是問題所在！ –

getsockopt從setsockopt返回不同的IP_TOS值

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