705 lines
22 KiB
Rust
705 lines
22 KiB
Rust
#![cfg_attr(not(feature = "std"), no_std)]
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#![cfg_attr(feature = "nightly", feature(async_fn_in_trait, impl_trait_projections))]
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#![warn(missing_docs)]
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#![doc = include_str!("../README.md")]
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// This mod MUST go first, so that the others see its macros.
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pub(crate) mod fmt;
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mod device;
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#[cfg(feature = "dns")]
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pub mod dns;
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#[cfg(feature = "tcp")]
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pub mod tcp;
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mod time;
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#[cfg(feature = "udp")]
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pub mod udp;
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use core::cell::RefCell;
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use core::future::{poll_fn, Future};
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use core::task::{Context, Poll};
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pub use embassy_net_driver as driver;
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use embassy_net_driver::{Driver, LinkState, Medium};
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use embassy_sync::waitqueue::WakerRegistration;
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use embassy_time::{Instant, Timer};
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use futures::pin_mut;
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use heapless::Vec;
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#[cfg(feature = "igmp")]
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pub use smoltcp::iface::MulticastError;
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use smoltcp::iface::{Interface, SocketHandle, SocketSet, SocketStorage};
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#[cfg(feature = "dhcpv4")]
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use smoltcp::socket::dhcpv4::{self, RetryConfig};
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#[cfg(feature = "udp")]
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pub use smoltcp::wire::IpListenEndpoint;
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#[cfg(feature = "medium-ethernet")]
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pub use smoltcp::wire::{EthernetAddress, HardwareAddress};
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pub use smoltcp::wire::{IpAddress, IpCidr};
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#[cfg(feature = "proto-ipv4")]
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pub use smoltcp::wire::{Ipv4Address, Ipv4Cidr};
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#[cfg(feature = "proto-ipv6")]
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pub use smoltcp::wire::{Ipv6Address, Ipv6Cidr};
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use crate::device::DriverAdapter;
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use crate::time::{instant_from_smoltcp, instant_to_smoltcp};
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const LOCAL_PORT_MIN: u16 = 1025;
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const LOCAL_PORT_MAX: u16 = 65535;
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#[cfg(feature = "dns")]
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const MAX_QUERIES: usize = 4;
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/// Memory resources needed for a network stack.
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pub struct StackResources<const SOCK: usize> {
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sockets: [SocketStorage<'static>; SOCK],
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#[cfg(feature = "dns")]
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queries: [Option<dns::DnsQuery>; MAX_QUERIES],
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}
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impl<const SOCK: usize> StackResources<SOCK> {
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/// Create a new set of stack resources.
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pub const fn new() -> Self {
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#[cfg(feature = "dns")]
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const INIT: Option<dns::DnsQuery> = None;
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Self {
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sockets: [SocketStorage::EMPTY; SOCK],
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#[cfg(feature = "dns")]
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queries: [INIT; MAX_QUERIES],
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}
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}
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}
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/// Static IP address configuration.
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#[cfg(feature = "proto-ipv4")]
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#[derive(Debug, Clone, PartialEq, Eq)]
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pub struct StaticConfigV4 {
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/// IP address and subnet mask.
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pub address: Ipv4Cidr,
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/// Default gateway.
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pub gateway: Option<Ipv4Address>,
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/// DNS servers.
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pub dns_servers: Vec<Ipv4Address, 3>,
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}
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/// Static IPv6 address configuration
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#[cfg(feature = "proto-ipv6")]
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#[derive(Debug, Clone, PartialEq, Eq)]
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pub struct StaticConfigV6 {
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/// IP address and subnet mask.
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pub address: Ipv6Cidr,
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/// Default gateway.
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pub gateway: Option<Ipv6Address>,
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/// DNS servers.
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pub dns_servers: Vec<Ipv6Address, 3>,
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}
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/// DHCP configuration.
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#[cfg(feature = "dhcpv4")]
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#[derive(Debug, Clone, PartialEq, Eq)]
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pub struct DhcpConfig {
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/// Maximum lease duration.
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///
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/// If not set, the lease duration specified by the server will be used.
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/// If set, the lease duration will be capped at this value.
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pub max_lease_duration: Option<embassy_time::Duration>,
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/// Retry configuration.
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pub retry_config: RetryConfig,
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/// Ignore NAKs from DHCP servers.
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///
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/// This is not compliant with the DHCP RFCs, since theoretically we must stop using the assigned IP when receiving a NAK. This can increase reliability on broken networks with buggy routers or rogue DHCP servers, however.
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pub ignore_naks: bool,
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/// Server port. This is almost always 67. Do not change unless you know what you're doing.
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pub server_port: u16,
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/// Client port. This is almost always 68. Do not change unless you know what you're doing.
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pub client_port: u16,
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}
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#[cfg(feature = "dhcpv4")]
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impl Default for DhcpConfig {
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fn default() -> Self {
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Self {
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max_lease_duration: Default::default(),
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retry_config: Default::default(),
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ignore_naks: Default::default(),
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server_port: smoltcp::wire::DHCP_SERVER_PORT,
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client_port: smoltcp::wire::DHCP_CLIENT_PORT,
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}
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}
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}
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/// Network stack configuration.
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pub struct Config {
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/// IPv4 configuration
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#[cfg(feature = "proto-ipv4")]
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pub ipv4: ConfigV4,
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/// IPv6 configuration
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#[cfg(feature = "proto-ipv6")]
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pub ipv6: ConfigV6,
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}
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impl Config {
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/// IPv4 configuration with static addressing.
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#[cfg(feature = "proto-ipv4")]
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pub fn ipv4_static(config: StaticConfigV4) -> Self {
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Self {
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ipv4: ConfigV4::Static(config),
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#[cfg(feature = "proto-ipv6")]
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ipv6: ConfigV6::None,
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}
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}
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/// IPv6 configuration with static addressing.
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#[cfg(feature = "proto-ipv6")]
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pub fn ipv6_static(config: StaticConfigV6) -> Self {
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Self {
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#[cfg(feature = "proto-ipv4")]
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ipv4: ConfigV4::None,
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ipv6: ConfigV6::Static(config),
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}
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}
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/// IPv6 configuration with dynamic addressing.
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///
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/// # Example
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/// ```rust
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/// let _cfg = Config::dhcpv4(Default::default());
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/// ```
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#[cfg(feature = "dhcpv4")]
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pub fn dhcpv4(config: DhcpConfig) -> Self {
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Self {
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ipv4: ConfigV4::Dhcp(config),
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#[cfg(feature = "proto-ipv6")]
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ipv6: ConfigV6::None,
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}
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}
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}
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/// Network stack IPv4 configuration.
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#[cfg(feature = "proto-ipv4")]
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pub enum ConfigV4 {
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/// Use a static IPv4 address configuration.
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Static(StaticConfigV4),
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/// Use DHCP to obtain an IP address configuration.
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#[cfg(feature = "dhcpv4")]
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Dhcp(DhcpConfig),
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/// Do not configure IPv6.
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None,
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}
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/// Network stack IPv6 configuration.
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#[cfg(feature = "proto-ipv6")]
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pub enum ConfigV6 {
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/// Use a static IPv6 address configuration.
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Static(StaticConfigV6),
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/// Do not configure IPv6.
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None,
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}
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/// A network stack.
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///
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/// This is the main entry point for the network stack.
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pub struct Stack<D: Driver> {
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pub(crate) socket: RefCell<SocketStack>,
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inner: RefCell<Inner<D>>,
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}
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struct Inner<D: Driver> {
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device: D,
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link_up: bool,
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#[cfg(feature = "proto-ipv4")]
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static_v4: Option<StaticConfigV4>,
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#[cfg(feature = "proto-ipv6")]
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static_v6: Option<StaticConfigV6>,
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#[cfg(feature = "dhcpv4")]
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dhcp_socket: Option<SocketHandle>,
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#[cfg(feature = "dns")]
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dns_socket: SocketHandle,
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#[cfg(feature = "dns")]
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dns_waker: WakerRegistration,
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}
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pub(crate) struct SocketStack {
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pub(crate) sockets: SocketSet<'static>,
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pub(crate) iface: Interface,
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pub(crate) waker: WakerRegistration,
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next_local_port: u16,
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}
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impl<D: Driver + 'static> Stack<D> {
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/// Create a new network stack.
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pub fn new<const SOCK: usize>(
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mut device: D,
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config: Config,
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resources: &'static mut StackResources<SOCK>,
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random_seed: u64,
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) -> Self {
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#[cfg(feature = "medium-ethernet")]
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let medium = device.capabilities().medium;
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let hardware_addr = match medium {
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#[cfg(feature = "medium-ethernet")]
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Medium::Ethernet => HardwareAddress::Ethernet(EthernetAddress(device.ethernet_address())),
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#[cfg(feature = "medium-ip")]
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Medium::Ip => HardwareAddress::Ip,
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#[allow(unreachable_patterns)]
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_ => panic!(
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"Unsupported medium {:?}. Make sure to enable it in embassy-net's Cargo features.",
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medium
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),
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};
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let mut iface_cfg = smoltcp::iface::Config::new(hardware_addr);
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iface_cfg.random_seed = random_seed;
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let iface = Interface::new(
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iface_cfg,
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&mut DriverAdapter {
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inner: &mut device,
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cx: None,
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},
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instant_to_smoltcp(Instant::now()),
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);
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let sockets = SocketSet::new(&mut resources.sockets[..]);
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let next_local_port = (random_seed % (LOCAL_PORT_MAX - LOCAL_PORT_MIN) as u64) as u16 + LOCAL_PORT_MIN;
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let mut socket = SocketStack {
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sockets,
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iface,
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waker: WakerRegistration::new(),
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next_local_port,
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};
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let mut inner = Inner {
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device,
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link_up: false,
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#[cfg(feature = "proto-ipv4")]
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static_v4: None,
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#[cfg(feature = "proto-ipv6")]
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static_v6: None,
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#[cfg(feature = "dhcpv4")]
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dhcp_socket: None,
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#[cfg(feature = "dns")]
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dns_socket: socket.sockets.add(dns::Socket::new(
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&[],
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managed::ManagedSlice::Borrowed(&mut resources.queries),
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)),
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#[cfg(feature = "dns")]
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dns_waker: WakerRegistration::new(),
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};
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#[cfg(feature = "proto-ipv4")]
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match config.ipv4 {
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ConfigV4::Static(config) => {
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inner.apply_config_v4(&mut socket, config);
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}
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#[cfg(feature = "dhcpv4")]
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ConfigV4::Dhcp(config) => {
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let mut dhcp_socket = smoltcp::socket::dhcpv4::Socket::new();
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inner.apply_dhcp_config(&mut dhcp_socket, config);
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let handle = socket.sockets.add(dhcp_socket);
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inner.dhcp_socket = Some(handle);
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}
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ConfigV4::None => {}
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}
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#[cfg(feature = "proto-ipv6")]
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match config.ipv6 {
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ConfigV6::Static(config) => {
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inner.apply_config_v6(&mut socket, config);
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}
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ConfigV6::None => {}
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}
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Self {
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socket: RefCell::new(socket),
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inner: RefCell::new(inner),
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}
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}
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fn with<R>(&self, f: impl FnOnce(&SocketStack, &Inner<D>) -> R) -> R {
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f(&*self.socket.borrow(), &*self.inner.borrow())
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}
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fn with_mut<R>(&self, f: impl FnOnce(&mut SocketStack, &mut Inner<D>) -> R) -> R {
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f(&mut *self.socket.borrow_mut(), &mut *self.inner.borrow_mut())
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}
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/// Get the MAC address of the network interface.
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pub fn ethernet_address(&self) -> [u8; 6] {
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self.with(|_s, i| i.device.ethernet_address())
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}
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/// Get whether the link is up.
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pub fn is_link_up(&self) -> bool {
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self.with(|_s, i| i.link_up)
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}
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/// Get whether the network stack has a valid IP configuration.
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/// This is true if the network stack has a static IP configuration or if DHCP has completed
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pub fn is_config_up(&self) -> bool {
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let v4_up;
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let v6_up;
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#[cfg(feature = "proto-ipv4")]
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{
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v4_up = self.config_v4().is_some();
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}
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#[cfg(not(feature = "proto-ipv4"))]
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{
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v4_up = false;
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}
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#[cfg(feature = "proto-ipv6")]
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{
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v6_up = self.config_v6().is_some();
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}
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#[cfg(not(feature = "proto-ipv6"))]
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{
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v6_up = false;
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}
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v4_up || v6_up
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}
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/// Get the current IPv4 configuration.
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#[cfg(feature = "proto-ipv4")]
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pub fn config_v4(&self) -> Option<StaticConfigV4> {
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self.with(|_s, i| i.static_v4.clone())
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}
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/// Get the current IPv6 configuration.
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#[cfg(feature = "proto-ipv6")]
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pub fn config_v6(&self) -> Option<StaticConfigV6> {
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self.with(|_s, i| i.static_v6.clone())
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}
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/// Run the network stack.
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///
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/// You must call this in a background task, to process network events.
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pub async fn run(&self) -> ! {
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poll_fn(|cx| {
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self.with_mut(|s, i| i.poll(cx, s));
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Poll::<()>::Pending
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})
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.await;
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unreachable!()
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}
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/// Make a query for a given name and return the corresponding IP addresses.
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#[cfg(feature = "dns")]
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pub async fn dns_query(&self, name: &str, qtype: dns::DnsQueryType) -> Result<Vec<IpAddress, 1>, dns::Error> {
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// For A and AAAA queries we try detect whether `name` is just an IP address
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match qtype {
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#[cfg(feature = "proto-ipv4")]
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dns::DnsQueryType::A => {
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if let Ok(ip) = name.parse().map(IpAddress::Ipv4) {
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return Ok([ip].into_iter().collect());
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}
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}
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#[cfg(feature = "proto-ipv6")]
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dns::DnsQueryType::Aaaa => {
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if let Ok(ip) = name.parse().map(IpAddress::Ipv6) {
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return Ok([ip].into_iter().collect());
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}
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}
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_ => {}
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}
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let query = poll_fn(|cx| {
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self.with_mut(|s, i| {
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let socket = s.sockets.get_mut::<dns::Socket>(i.dns_socket);
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match socket.start_query(s.iface.context(), name, qtype) {
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Ok(handle) => Poll::Ready(Ok(handle)),
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Err(dns::StartQueryError::NoFreeSlot) => {
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i.dns_waker.register(cx.waker());
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Poll::Pending
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}
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Err(e) => Poll::Ready(Err(e)),
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}
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})
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})
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.await?;
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use embassy_hal_common::drop::OnDrop;
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let drop = OnDrop::new(|| {
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self.with_mut(|s, i| {
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let socket = s.sockets.get_mut::<dns::Socket>(i.dns_socket);
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socket.cancel_query(query);
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s.waker.wake();
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i.dns_waker.wake();
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})
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});
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let res = poll_fn(|cx| {
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self.with_mut(|s, i| {
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let socket = s.sockets.get_mut::<dns::Socket>(i.dns_socket);
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match socket.get_query_result(query) {
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Ok(addrs) => {
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i.dns_waker.wake();
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Poll::Ready(Ok(addrs))
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}
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Err(dns::GetQueryResultError::Pending) => {
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socket.register_query_waker(query, cx.waker());
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Poll::Pending
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}
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Err(e) => {
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i.dns_waker.wake();
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Poll::Ready(Err(e.into()))
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}
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}
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})
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})
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.await;
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drop.defuse();
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res
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}
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}
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#[cfg(feature = "igmp")]
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impl<D: Driver + smoltcp::phy::Device + 'static> Stack<D> {
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/// Join a multicast group.
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pub fn join_multicast_group<T>(&self, addr: T) -> Result<bool, MulticastError>
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where
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T: Into<IpAddress>,
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{
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let addr = addr.into();
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self.with_mut(|s, i| {
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s.iface
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.join_multicast_group(&mut i.device, addr, instant_to_smoltcp(Instant::now()))
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})
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}
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/// Leave a multicast group.
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pub fn leave_multicast_group<T>(&self, addr: T) -> Result<bool, MulticastError>
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where
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T: Into<IpAddress>,
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{
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let addr = addr.into();
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self.with_mut(|s, i| {
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s.iface
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.leave_multicast_group(&mut i.device, addr, instant_to_smoltcp(Instant::now()))
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})
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}
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/// Get whether the network stack has joined the given multicast group.
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pub fn has_multicast_group<T: Into<IpAddress>>(&self, addr: T) -> bool {
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self.socket.borrow().iface.has_multicast_group(addr)
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}
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}
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impl SocketStack {
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#[allow(clippy::absurd_extreme_comparisons, dead_code)]
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pub fn get_local_port(&mut self) -> u16 {
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let res = self.next_local_port;
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self.next_local_port = if res >= LOCAL_PORT_MAX { LOCAL_PORT_MIN } else { res + 1 };
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res
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}
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}
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impl<D: Driver + 'static> Inner<D> {
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#[cfg(feature = "proto-ipv4")]
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fn apply_config_v4(&mut self, s: &mut SocketStack, config: StaticConfigV4) {
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#[cfg(feature = "medium-ethernet")]
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|
let medium = self.device.capabilities().medium;
|
|
|
|
debug!("Acquired IP configuration:");
|
|
|
|
debug!(" IP address: {}", config.address);
|
|
s.iface.update_ip_addrs(|addrs| {
|
|
if addrs.is_empty() {
|
|
addrs.push(IpCidr::Ipv4(config.address)).unwrap();
|
|
} else {
|
|
addrs[0] = IpCidr::Ipv4(config.address);
|
|
}
|
|
});
|
|
|
|
#[cfg(feature = "medium-ethernet")]
|
|
if medium == Medium::Ethernet {
|
|
if let Some(gateway) = config.gateway {
|
|
debug!(" Default gateway: {}", gateway);
|
|
s.iface.routes_mut().add_default_ipv4_route(gateway).unwrap();
|
|
} else {
|
|
debug!(" Default gateway: None");
|
|
s.iface.routes_mut().remove_default_ipv4_route();
|
|
}
|
|
}
|
|
for (i, s) in config.dns_servers.iter().enumerate() {
|
|
debug!(" DNS server {}: {}", i, s);
|
|
}
|
|
|
|
self.static_v4 = Some(config);
|
|
|
|
#[cfg(feature = "dns")]
|
|
{
|
|
self.update_dns_servers(s)
|
|
}
|
|
}
|
|
|
|
/// Replaces the current IPv6 static configuration with a newly supplied config.
|
|
#[cfg(feature = "proto-ipv6")]
|
|
fn apply_config_v6(&mut self, s: &mut SocketStack, config: StaticConfigV6) {
|
|
#[cfg(feature = "medium-ethernet")]
|
|
let medium = self.device.capabilities().medium;
|
|
|
|
debug!("Acquired IPv6 configuration:");
|
|
|
|
debug!(" IP address: {}", config.address);
|
|
s.iface.update_ip_addrs(|addrs| {
|
|
if addrs.is_empty() {
|
|
addrs.push(IpCidr::Ipv6(config.address)).unwrap();
|
|
} else {
|
|
addrs[0] = IpCidr::Ipv6(config.address);
|
|
}
|
|
});
|
|
|
|
#[cfg(feature = "medium-ethernet")]
|
|
if Medium::Ethernet == medium {
|
|
if let Some(gateway) = config.gateway {
|
|
debug!(" Default gateway: {}", gateway);
|
|
s.iface.routes_mut().add_default_ipv6_route(gateway).unwrap();
|
|
} else {
|
|
debug!(" Default gateway: None");
|
|
s.iface.routes_mut().remove_default_ipv6_route();
|
|
}
|
|
}
|
|
for (i, s) in config.dns_servers.iter().enumerate() {
|
|
debug!(" DNS server {}: {}", i, s);
|
|
}
|
|
|
|
self.static_v6 = Some(config);
|
|
|
|
#[cfg(feature = "dns")]
|
|
{
|
|
self.update_dns_servers(s)
|
|
}
|
|
}
|
|
|
|
#[cfg(feature = "dns")]
|
|
fn update_dns_servers(&mut self, s: &mut SocketStack) {
|
|
let socket = s.sockets.get_mut::<smoltcp::socket::dns::Socket>(self.dns_socket);
|
|
|
|
let servers_v4;
|
|
#[cfg(feature = "proto-ipv4")]
|
|
{
|
|
servers_v4 = self
|
|
.static_v4
|
|
.iter()
|
|
.flat_map(|cfg| cfg.dns_servers.iter().map(|c| IpAddress::Ipv4(*c)));
|
|
};
|
|
#[cfg(not(feature = "proto-ipv4"))]
|
|
{
|
|
servers_v4 = core::iter::empty();
|
|
}
|
|
|
|
let servers_v6;
|
|
#[cfg(feature = "proto-ipv6")]
|
|
{
|
|
servers_v6 = self
|
|
.static_v6
|
|
.iter()
|
|
.flat_map(|cfg| cfg.dns_servers.iter().map(|c| IpAddress::Ipv6(*c)));
|
|
}
|
|
#[cfg(not(feature = "proto-ipv6"))]
|
|
{
|
|
servers_v6 = core::iter::empty();
|
|
}
|
|
|
|
// Prefer the v6 DNS servers over the v4 servers
|
|
let servers: Vec<IpAddress, 6> = servers_v6.chain(servers_v4).collect();
|
|
socket.update_servers(&servers[..]);
|
|
}
|
|
|
|
#[cfg(feature = "dhcpv4")]
|
|
fn apply_dhcp_config(&self, socket: &mut smoltcp::socket::dhcpv4::Socket, config: DhcpConfig) {
|
|
socket.set_ignore_naks(config.ignore_naks);
|
|
socket.set_max_lease_duration(config.max_lease_duration.map(crate::time::duration_to_smoltcp));
|
|
socket.set_ports(config.server_port, config.client_port);
|
|
socket.set_retry_config(config.retry_config);
|
|
}
|
|
|
|
#[allow(unused)] // used only with dhcp
|
|
fn unapply_config(&mut self, s: &mut SocketStack) {
|
|
#[cfg(feature = "medium-ethernet")]
|
|
let medium = self.device.capabilities().medium;
|
|
|
|
debug!("Lost IP configuration");
|
|
s.iface.update_ip_addrs(|ip_addrs| ip_addrs.clear());
|
|
#[cfg(feature = "medium-ethernet")]
|
|
if medium == Medium::Ethernet {
|
|
#[cfg(feature = "proto-ipv4")]
|
|
{
|
|
s.iface.routes_mut().remove_default_ipv4_route();
|
|
}
|
|
}
|
|
#[cfg(feature = "proto-ipv4")]
|
|
{
|
|
self.static_v4 = None
|
|
}
|
|
}
|
|
|
|
fn poll(&mut self, cx: &mut Context<'_>, s: &mut SocketStack) {
|
|
s.waker.register(cx.waker());
|
|
|
|
#[cfg(feature = "medium-ethernet")]
|
|
if self.device.capabilities().medium == Medium::Ethernet {
|
|
s.iface.set_hardware_addr(HardwareAddress::Ethernet(EthernetAddress(
|
|
self.device.ethernet_address(),
|
|
)));
|
|
}
|
|
|
|
let timestamp = instant_to_smoltcp(Instant::now());
|
|
let mut smoldev = DriverAdapter {
|
|
cx: Some(cx),
|
|
inner: &mut self.device,
|
|
};
|
|
s.iface.poll(timestamp, &mut smoldev, &mut s.sockets);
|
|
|
|
// Update link up
|
|
let old_link_up = self.link_up;
|
|
self.link_up = self.device.link_state(cx) == LinkState::Up;
|
|
|
|
// Print when changed
|
|
if old_link_up != self.link_up {
|
|
info!("link_up = {:?}", self.link_up);
|
|
}
|
|
|
|
#[cfg(feature = "dhcpv4")]
|
|
if let Some(dhcp_handle) = self.dhcp_socket {
|
|
let socket = s.sockets.get_mut::<dhcpv4::Socket>(dhcp_handle);
|
|
|
|
if self.link_up {
|
|
match socket.poll() {
|
|
None => {}
|
|
Some(dhcpv4::Event::Deconfigured) => self.unapply_config(s),
|
|
Some(dhcpv4::Event::Configured(config)) => {
|
|
let config = StaticConfigV4 {
|
|
address: config.address,
|
|
gateway: config.router,
|
|
dns_servers: config.dns_servers,
|
|
};
|
|
self.apply_config_v4(s, config)
|
|
}
|
|
}
|
|
} else if old_link_up {
|
|
socket.reset();
|
|
self.unapply_config(s);
|
|
}
|
|
}
|
|
//if old_link_up || self.link_up {
|
|
// self.poll_configurator(timestamp)
|
|
//}
|
|
//
|
|
|
|
if let Some(poll_at) = s.iface.poll_at(timestamp, &mut s.sockets) {
|
|
let t = Timer::at(instant_from_smoltcp(poll_at));
|
|
pin_mut!(t);
|
|
if t.poll(cx).is_ready() {
|
|
cx.waker().wake_by_ref();
|
|
}
|
|
}
|
|
}
|
|
}
|