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firezone/rust/ip-packet
Thomas Eizinger d8cc4c7161 chore(rust): use latest main of smoltcp (#7062)
The last released version of `smoltcp` is `0.11.0`. That version is
almost a year old. Since then, an important "bug" got fixed in the IPv6
handling code of `smoltcp`.

In order to route packets to our interface, we define a dummy IPv4 and
IPv6 address and create catch-all routes with our interface as the
gateway. Together with `set_any_ip(true)`, the makes `smoltcp` accept
any packet we pass it to. This is necessary because we don't directly
connect `smoltcp` to the TUN device but rather have an `InMemoryDevice`
where we explicitly feed certain packets to it.

In the last released version, `smoltcp` only performs the above logic
for IPv4. For IPv6, the additional check for "do we have a route that
this packet matches" doesn't exist and thus no IPv6 traffic is accepted
by `smoltcp`.

Extracted out of #6944.
2024-10-16 02:15:26 +00:00
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