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                 // pretent as if this came from route
  40                 trace!(
  41                   target: "hippotatd",
  42  "discard to={:?} via=ipif user=local from-outside-vnets-={:?}",
  43                   daddr, saddr);
  44                 return Ok(())
  45               }
  46
  47               route_packet(
  48                 &global, "ipif", None,
  49                 data, daddr, may_route.clone()
  50               ).await;
  51
  52               Ok(())
  53             }
  54           }, |pe| Ok(match pe {
  55             PE::Empty => { },
  56             other => throw!(other),
  57           })).await {
  58             Ok(()) => goodness += 1,
  59             Err(e) => {
  60               goodness -= 1;
  61               error!("[good={}] invalid data from local tx ipif {}",
  62                      goodness, e);
  63               if goodness < GOODNESS_MIN {
  64                 throw!(anyhow!("too many bad packets, too few good ones!"))
  65               }
  66             },
  67           }
  68         }
  69       }
  70     }
  71   }.await;
  72
  73   ipif.quitting(None).await;
  74   r
  75 }