Does Winsock support IPv6 extension headers?

StackOverflow https://stackoverflow.com/questions/22933350

  •  29-06-2023
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Question

Is it possible to look at (and modify) IPv6 extension headers with Winsock using C/ C++? What API's allow us to do that?

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Solution

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.

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