getsockopt返回与setockopt中的一组不同的IP_TOS值 [英] getsockopt returns different IP_TOS value from the one set in setsockopt

问题描述

我正在尝试使用 setsockopt 将 IPTOS 值设置为 IPTOS_THROUGHPUT . setsockopt 调用返回 0 .但是， getsockopt 显示 IP_TOS 值设置为 1 ，这与 IPTOS_THROUGHPUT ( 0x8).有谁知道是什么原因导致了 setsockopt 和 getsockopt 中的 IPTOS 值不匹配?

I'm trying to use setsockopt to set IPTOS value to IPTOS_THROUGHPUT. The setsockopt call returned 0. However the getsockopt shows the IP_TOS value is set to 1, which is different from IPTOS_THROUGHPUT (0x8). Does anyone have idea what could have caused the mismatch of IPTOS value in the setsockopt and getsockopt?

以下是日志输出:

在套接字26上设置DSCP标记

Set DSCP Marking on socket 26

套接字26到8上的setsockopt返回0

setsockopt on socket 26 to 8 returns 0

插槽26上的DSCP标记为1，与预期的8不同

DSCP marking on socket 26 is 1, different from expected 8

下面是代码:

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;
      }
   }
}

推荐答案

您应该使用级别选项 IPPROTO_IP 而不是 IPPROTO_TCP

You should use the level option IPPROTO_IP instead of IPPROTO_TCP

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