server/slocal.rs

   1 // Copyright 2021 Ian Jackson and contributors to Hippotat
   2 // SPDX-License-Identifier: GPL-3.0-or-later
   3 // There is NO WARRANTY.
   4
   5 use super::*;
   6
   7 #[allow(dead_code)] // xxx
   8 #[allow(unused_variables)] // xxx
   9 pub async fn run(global: Arc<Global>,
  10                  rx: mpsc::Receiver<RoutedPacket>,
  11                  mut ipif: Ipif) -> Result<Void,AE> {
  12   let r = async {
  13     let mut goodness: i32 = 0;
  14     const GOODNESS_SHIFT: u8 = 8;
  15     const GOODNESS_MIN: i32 = -16;
  16
  17     loop {
  18       select!{
  19         biased;
  20
  21         // xxx something something rx something
  22
  23         data = Ipif::next_frame(&mut ipif.tx) =>
  24         {
  25           let data = data?;
  26           let may_route = MayRoute::came_from_outside_hippotatd();
  27
  28           goodness -= goodness >> GOODNESS_SHIFT;
  29
  30           match checkn(SlipNoConv, global.config.mtu, &data, |header|{
  31             let saddr = ip_packet_addr::<false>(header)?;
  32             let daddr = ip_packet_addr::<true>(header)?;
  33             Ok((saddr,daddr))
  34           }, |(data, (saddr, daddr))| {
  35             let global = &global;
  36             let may_route = &may_route;
  37             async move {
  38               if ! global.config.vnetwork.iter().any(|n| n.contains(&saddr)) {
  39                 trace!( "ipif local discard outside-vnets saddr={:?}",
  40                          saddr);
  41                 return Ok(())
  42               }
  43
  44               route_packet(
  45                 &global, "ipif", None,
  46                 data, daddr, may_route.clone()
  47               ).await;
  48
  49               Ok(())
  50             }
  51           }, |pe| Ok(match pe {
  52             PE::Empty => { },
  53             other => throw!(other),
  54           })).await {
  55             Ok(()) => goodness += 1,
  56             Err(e) => {
  57               goodness -= 1;
  58               error!("[good={}] invalid data from local tx ipif {}",
  59                      goodness, e);
  60               if goodness < GOODNESS_MIN {
  61                 throw!(anyhow!("too many bad packets, too few good ones!"))
  62               }
  63             },
  64           }
  65         }
  66       }
  67     }
  68   }.await;
  69
  70   ipif.quitting(None).await;
  71   r
  72 }