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mfontanini / libtins

High-level, multiplatform C++ network packet sniffing and crafting library.
http://libtins.github.io/
BSD 2-Clause "Simplified" License
1.89k stars 374 forks source link

IPv6 use interface when sending to link-local dest #448

Closed fluke-pvan closed 2 years ago

fluke-pvan commented 2 years ago

Attempting to send a Tins::IPv6 PDU with a link-scope destination address will result in a "Network is unreachable" error (error code 101). From the RFC2553 document section 3.3, it states

The sin6_scope_id field is a 32-bit integer that identifies a set of interfaces as appropriate for the scope of the address carried in the sin6_addr field. For a link scope sin6_addr, sin6_scope_id would be an interface index.

It understand this might be argued against since we're allowing a non-link layer PDU to be sent through a specified interface, but overall I think this should be up to the user to decide if a packet should be sent through a specified interface or allow the kernel to do so. Maybe that will be another pull request.

mfontanini commented 2 years ago

I think this is a reasonable change. If an interface index is required then we should be setting it.

Thanks!