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example/6lowpan: expand readme, do not use monitor interface. 

Using a raw socket on `monitor0` causes weird results: packets we receive
include FCS, packets we send are parsed as if they didn't have FCS, except
by wireshark which always expects a FCS??

Turns out the sane way is to use raw sockets on normal `wpanX` interfaces,
in which case all packets we send/receive are without FCS.
master
Dario Nieuwenhuis 2021-10-07 05:26:44 +02:00
parent 36a0e9b2f3
commit 3b8a0781e5
1 changed files with 47 additions and 27 deletions
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74
examples/sixlowpan.rs
View File

@ -1,27 +1,44 @@
/*
# Setup
modprobe mac802154_hwsim
ip link set wpan0 down
iwpan dev wpan0 set pan_id 0xbeef
ip link add link wpan0 name lowpan0 type lowpan
ip link set wpan0 up
ip link set lowpan0 up
iwpan dev wpan1 del
iwpan phy phy1 interface add monitor%d type monitor
# Running
sudo ./target/debug/examples/sixlowpan
# Teardown
rmmod mac802154_hwsim
*/
//! 6lowpan exmaple
//!
//! This example is designed to run using the Linux ieee802154/6lowpan support,
//! using mac802154_hwsim.
//!
//! mac802154_hwsim allows you to create multiple "virtual" radios and specify
//! which is in range with which. This is very useful for testing without
//! needing real hardware. By default it creates two interfaces `wpan0` and
//! `wpan1` that are in range with each other. You can customize this with
//! the `wpan-hwsim` tool.
//!
//! We'll configure Linux to speak 6lowpan on `wpan0`, and leave `wpan1`
//! unconfigured so smoltcp can use it with a raw socket.
//!
//! # Setup
//!
//! modprobe mac802154_hwsim
//!
//! ip link set wpan0 down
//! ip link set wpan1 down
//! iwpan dev wpan0 set pan_id 0xbeef
//! iwpan dev wpan1 set pan_id 0xbeef
//! ip link add link wpan0 name lowpan0 type lowpan
//! ip link set wpan0 up
//! ip link set wpan1 up
//! ip link set lowpan0 up
//!
//! # Running
//!
//! Run it with `sudo ./target/debug/examples/sixlowpan`.
//!
//! You can set wireshark to sniff on interface `wpan0` to see the packets.
//!
//! Ping it with `ping fe80::180b:4242:4242:4242%lowpan0`.
//!
//! Speak UDP with `nc -uv fe80::180b:4242:4242:4242%lowpan0 6969`.
//!
//! # Teardown
//!
//! rmmod mac802154_hwsim
//!
mod utils;
@ -35,7 +52,7 @@ use smoltcp::phy::{wait as phy_wait, Medium, RawSocket};
use smoltcp::socket::SocketSet;
use smoltcp::socket::{UdpPacketMetadata, UdpSocket, UdpSocketBuffer};
use smoltcp::time::Instant;
use smoltcp::wire::{IpAddress, IpCidr};
use smoltcp::wire::{Ieee802154Pan, IpAddress, IpCidr};
fn main() {
utils::setup_logging("");
@ -45,7 +62,7 @@ fn main() {
let mut matches = utils::parse_options(&opts, free);
let device = RawSocket::new("monitor0", Medium::Ieee802154).unwrap();
let device = RawSocket::new("wpan1", Medium::Ieee802154).unwrap();
let fd = device.as_raw_fd();
let device = utils::parse_middleware_options(&mut matches, device, /*loopback=*/ false);
@ -64,7 +81,10 @@ fn main() {
64,
)];
let mut builder = InterfaceBuilder::new(device).ip_addrs(ip_addrs);
let mut builder = InterfaceBuilder::new(device)
.ip_addrs(ip_addrs)
.dst_pan_id(Ieee802154Pan(0xbeef))
.src_pan_id(Ieee802154Pan(0xbeef));
builder = builder
.hardware_addr(ieee802154_addr.into())
.neighbor_cache(neighbor_cache);