问题
Is it possible to look at (and modify) IPv6 extension headers with Winsock using C/ C++? What API's allow us to do that?
回答1:
IPv6 headers are not received using Raw Sockets on Winsock. As this MSDN page says
For IPv6 (address family of AF_INET6), an application receives everything after the last IPv6 header in each received datagram regardless of the IPV6_HDRINCL socket option. The application does not receive any IPv6 headers using a raw socket.
In other words, it's not possible to receive and modify IPv6 headers (or extension headers) using Winsock.
来源：https://stackoverflow.com/questions/22933350/does-winsock-support-ipv6-extension-headers