On Wed, 12 Apr 2023 18:35:40 +0200 Matthieu Baerts wrote: > > Is this theoretical, or you think any library might be doing this > > already? I lack of sufficient knowledge of the MPTCP ecosystem to > > evaluate myself. > > This is theoretical. > > But using it with socket's protocol parameter is the only good usage of > IPPROTO_MAX for me :-D Perhaps. No strong preference from me. That said I think I can come up with a good name for the SO use: SO_IPPROTO_MAX (which IMHO it's better than IPPROTO_UAPI_MAX if Pablo doesn't mind sed'ing?) The name for a max in proto sense... I'm not sure what that would be. IPPROTO_MAX_IPPROTO ? IP_IPROTO_MAX ? IP_PROTO_MAX ? Dunno.. > More seriously, I don't see such things when looking at: > > > https://codesearch.debian.net/search?q=%5CbIPPROTO_MAX%5Cb&literal=0&perpkg=1 > > IPPROTO_MAX is (re)defined in different libs but not used in many > programs, mainly in Netfilter related programs in fact. > > > Even if it is linked to MPTCP, I cannot judge if it can be an issue or > not because it depends on how the different libC or other libs/apps are > interpreting this IPPROTO_MAX and if they are using it before creating a > socket.
