Struct Ipv4Layer 

pub struct Ipv4Layer {
    addresses: RwLock<BTreeMap<String, Vec<Ipv4AddressInfo>>>,
    routing_table: RwLock<Vec<RouteEntry>>,
    protocols: RwLock<BTreeMap<u8, Arc<dyn NetworkLayer>>>,
    stats: RwLock<NetworkLayerStats>,
    default_ttl: u8,
}

IPv4 layer

Handles IPv4 packet encapsulation and decapsulation. Manages multiple addresses per interface and routing table.

Fields

addresses: RwLock<BTreeMap<String, Vec<Ipv4AddressInfo>>>

Interface name -> list of IPv4 addresses

routing_table: RwLock<Vec<RouteEntry>>

Routing table (ordered by specificity)

protocols: RwLock<BTreeMap<u8, Arc<dyn NetworkLayer>>>

Protocol handlers registered by protocol number

stats: RwLock<NetworkLayerStats>

Statistics

default_ttl: u8

Default TTL

Implementations

impl Ipv4Layer

pub fn new() -> Arc<Self>

Create a new IPv4 layer

pub fn init(network_manager: &NetworkManager)

Initialize and register the IPv4 layer with NetworkManager

Registers with NetworkManager and registers itself with EthernetLayer for EtherType 0x0800 (IPv4).

Panics

Panics if EthernetLayer is not registered (must be initialized first).

pub fn add_address(&self, interface: &str, info: Ipv4AddressInfo)

Add an IPv4 address to an interface

pub fn remove_address(&self, interface: &str, ip: Ipv4Address)

Remove an IPv4 address from an interface

pub fn get_addresses(&self, interface: &str) -> Vec<Ipv4AddressInfo>

Get all addresses for an interface

pub fn get_primary_ip(&self, interface: &str) -> Option<Ipv4Address>

Get primary IP address for an interface

pub fn add_route(&self, entry: RouteEntry)

Add a route to the routing table

pub fn remove_route(&self, destination: Ipv4Address, netmask: Ipv4Address)

Remove a route from the routing table

pub fn set_default_gateway(&self, gateway: Ipv4Address, interface: &str)

Set default gateway

pub fn select_source( &self, dest: Ipv4Address, ) -> Option<(String, Ipv4Address, Option<Ipv4Address>)>

Select source IP and interface for a destination

Returns (interface_name, source_ip, optional_gateway)

fn ip_matches_route(&self, ip: Ipv4Address, route: &RouteEntry) -> bool

Check if an IP matches a route

fn same_subnet( &self, ip1: Ipv4Address, ip2: Ipv4Address, mask: Ipv4Address, ) -> bool

Check if two IPs are in the same subnet

pub fn is_local_ip(&self, ip: Ipv4Address) -> bool

Check if an IP is local (assigned to any interface)

pub fn get_protocol_handler( &self, proto_num: u8, ) -> Option<Arc<dyn NetworkLayer>>

Get protocol handler for a protocol number

Trait Implementations

impl NetworkLayer for Ipv4Layer

fn register_protocol(&self, proto_num: u16, handler: Arc<dyn NetworkLayer>)

Register a protocol handler for this layer

fn send( &self, packet: &[u8], context: &LayerContext, next_layers: &[Arc<dyn NetworkLayer>], ) -> Result<(), SocketError>

Send a packet through this layer

fn receive( &self, packet: &[u8], _context: Option<&LayerContext>, ) -> Result<(), SocketError>

Receive and process a packet at this layer

fn name(&self) -> &'static str

Get layer name for debugging

fn stats(&self) -> NetworkLayerStats

Get layer statistics

fn as_any(&self) -> &dyn Any

Cast to Any for safe downcasting

fn configure( &self, config: &SocketConfig, next_layers: &[Arc<dyn NetworkLayer>], ) -> Result<(), SocketError>

Configure this layer with socket-specific parameters