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如何从收到的IP包中取的DSCP值
来源: 互联网 发布时间：2016-06-08
本文导语: 好像用getsockopt函数不能取道，有其他的方法吗 | IP_TOS This option lets us set the type-of-service (TOS) field (which contains the DSCP and ECN fields, Figure A.1) in the IP header for a TCP, UDP, or SCTP so...
好像用getsockopt函数不能取道，有其他的方法吗
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IP_TOS
This option lets us set the type-of-service (TOS) field (which contains the DSCP and ECN fields,
Figure A.1) in the IP header for a TCP, UDP, or SCTP socket. If we call getsockopt for this
option, the current value that would be placed into the DSCP and ECN fields in the IP header
(which defaults to 0) is returned. There is no way to fetch the value from a received IP datagram.
摘自《UNIX网络编程》第一卷
This option lets us set the type-of-service (TOS) field (which contains the DSCP and ECN fields,
Figure A.1) in the IP header for a TCP, UDP, or SCTP socket. If we call getsockopt for this
option, the current value that would be placed into the DSCP and ECN fields in the IP header
(which defaults to 0) is returned. There is no way to fetch the value from a received IP datagram.
摘自《UNIX网络编程》第一卷
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To specify the traffic class for a given packet, include the ancillary data with that packet.
To specify the traffic class for all packets on a socket, specify the traffic class as an
integer to the IPV6_TCLASS socket option. The received traffic class is returned as ancillary
data by recvmsg only if the application has the IPV6_RECVTCLASS socket option enabled
To specify the traffic class for all packets on a socket, specify the traffic class as an
integer to the IPV6_TCLASS socket option. The received traffic class is returned as ancillary
data by recvmsg only if the application has the IPV6_RECVTCLASS socket option enabled
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