Hi, so I was tinkering with programs attached to reuseport groups again, and simple decisions work as expected. The problem comes when I want to make decisions based on source or destination IP address. Since the sockets in the socket group are already UDP or TCP, I can only see the payloads. In userspace, I can use IP(V6)_PKTINFO and get this over ancillary data, but I couldn't find anything like this in helpers, so I'm wondering what to do. Things I'm considering:
1. I'm probably missing something. I expected to be able to see the whole packet in reuseport programs (unlike in socket filters bound to sockets). 2. I need to make a helper, or something like SKF_AD_PROTOCOL (or direct access through skb), but for PKTINFO. 3. I should look at the addresses in tc, tag messages based on source/destination address (assuming I can convey the tag through some skb field somehow), and then make decisions based on tags in the socket filter. Any ideas? Cheers, Marek
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