Struct IcmpBackoff 

pub struct IcmpBackoff {
    pub blocked_total: Arc<AtomicU64>,
    /* private fields */
}

ICMP-unreachable backoff table. Same shape as Slash24Backoff so the TX hot path can consult both with identical cost.

Fields

blocked_total: Arc<AtomicU64>

Total /24s currently in active backoff at any tick. Useful as a scan-level health metric.

Implementations

impl IcmpBackoff

pub fn new() -> Self

Empty table.

pub fn slash24_of(ip: Ipv4Addr) -> u32

Convert an IPv4 address to the /24 key used by this table.

pub fn feed(&self, slash24: u32, count: u32, cfg: IcmpBackoffConfig) -> bool

Feed count ICMP-unreachable observations for slash24. Returns true if the /24 is now (or was already) in backoff.

pub fn feed_at( &self, slash24: u32, count: u32, cfg: IcmpBackoffConfig, now: Instant, ) -> bool

Test-friendly variant — explicit now so we can simulate time.

pub fn is_blocked(&self, slash24: u32) -> bool

Read-only check for the TX hot path. Lock-light: returns false on any contention rather than blocking.

pub fn is_blocked_at(&self, slash24: u32, now: Instant) -> bool

Test-friendly check — explicit now.

pub fn prune(&self, cfg: IcmpBackoffConfig)

Drop entries that are out of window AND not currently blocked. Call from a 1Hz prune thread; cheap when the map is small.

Trait Implementations

impl Clone for IcmpBackoff

fn clone(&self) -> IcmpBackoff

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Default for IcmpBackoff

fn default() -> IcmpBackoff

Returns the “default value” for a type.