Struct RuleBuilder 

pub struct RuleBuilder { /* private fields */ }

Per-closure state and rule accumulator.

Lives only within a .rule() / .egress() / .ingress() / .any() closure; its accumulated rules and errors are drained into the parent NetworkPolicyBuilder when the closure returns.

Implementations

impl RuleBuilder

pub fn egress(&mut self) -> &mut Self

Set direction to Egress for subsequent rule-adders. Last-write-wins.

pub fn ingress(&mut self) -> &mut Self

Set direction to Ingress for subsequent rule-adders. Last-write-wins.

pub fn any(&mut self) -> &mut Self

Set direction to Any for subsequent rule-adders. Rules committed after this apply in both directions. Last-write-wins.

pub fn tcp(&mut self) -> &mut Self

Add Tcp to the protocols set (set semantics; duplicates dedupe).

pub fn udp(&mut self) -> &mut Self

Add Udp to the protocols set.

pub fn icmpv4(&mut self) -> &mut Self

Add Icmpv4 to the protocols set. Egress-only at build-time (commits will record an BuildError::IngressDoesNotSupportIcmp if direction is Ingress or Any).

pub fn icmpv6(&mut self) -> &mut Self

Add Icmpv6 to the protocols set. Egress-only.

pub fn port(&mut self, port: u16) -> &mut Self

Add a single port to the ports set.

pub fn port_range(&mut self, lo: u16, hi: u16) -> &mut Self

Add an inclusive port range to the ports set. lo > hi records a BuildError::InvalidPortRange for .build() to surface.

pub fn ports<I: IntoIterator<Item = u16>>(&mut self, ports: I) -> &mut Self

Add multiple single ports to the ports set. Equivalent to calling Self::port once per element; duplicates dedupe via set semantics.

pub fn allow_public(&mut self) -> &mut Self

Allow the Public group: any IP not in another named category.

pub fn deny_public(&mut self) -> &mut Self

Deny the Public group.

pub fn allow_private(&mut self) -> &mut Self

Allow the Private group (RFC1918 + ULA + CGN).

pub fn deny_private(&mut self) -> &mut Self

Deny the Private group.

pub fn allow_loopback(&mut self) -> &mut Self

Allow the Loopback group: 127.0.0.0/8 and ::1 — the guest’s own loopback interface, not the host machine. Standard loopback traffic inside the guest stays in the guest kernel and never reaches this rule; it only fires for crafted packets that route loopback destinations out through the gateway (e.g. raw sockets bound to eth0 with dst=127.0.0.1). To reach a service on the host’s localhost, use Self::allow_host instead.

pub fn deny_loopback(&mut self) -> &mut Self

Deny the Loopback group. Useful in default_egress = Allow configurations to block crafted-packet leaks where a process inside the guest binds a raw socket to eth0 and writes a packet with dst=127.0.0.1 directly. The packet bypasses the guest’s routing table, smoltcp on the host parses the destination, and the connection lands on the host’s loopback. .deny_loopback() blocks that vector.

pub fn allow_link_local(&mut self) -> &mut Self

Allow the LinkLocal group (169.254.0.0/16, fe80::/10). Excludes the metadata IP 169.254.169.254 (categorized as Metadata).

pub fn deny_link_local(&mut self) -> &mut Self

Deny the LinkLocal group.

pub fn allow_meta(&mut self) -> &mut Self

Allow the Metadata group (169.254.169.254). Dangerous on cloud hosts — exposes IAM credentials.

pub fn deny_meta(&mut self) -> &mut Self

Deny the Metadata group.

pub fn allow_multicast(&mut self) -> &mut Self

Allow the Multicast group (224.0.0.0/4, ff00::/8).

pub fn deny_multicast(&mut self) -> &mut Self

Deny the Multicast group.

pub fn allow_host(&mut self) -> &mut Self

Allow the Host group: per-sandbox gateway IPs that back host.microsandbox.internal. This is the right shortcut for “let the sandbox reach my host’s localhost” — not Self::allow_loopback.

pub fn deny_host(&mut self) -> &mut Self

Deny the Host group.

pub fn allow_local(&mut self) -> &mut Self

Allow Loopback + LinkLocal + Host — the three “near the sandbox” groups a developer typically wants together when running locally. Adds three rules atomically, each using the closure’s current state.

Metadata is explicitly NOT included — even though 169.254.169.254 falls inside the link-local CIDR by raw address, the schema’s Metadata carve-out is preserved here. Users wanting cloud metadata access add Self::allow_meta separately.

pub fn deny_local(&mut self) -> &mut Self

Deny Loopback + LinkLocal + Host (no Metadata). See Self::allow_local for the membership rationale.

pub fn allow(&mut self) -> RuleDestinationBuilder<'_>

Begin an explicit-destination rule with action Allow. Returns an RuleDestinationBuilder that requires a destination call (.ip, .cidr, .domain, .domain_suffix, .group, .any) to commit the rule.

pub fn deny(&mut self) -> RuleDestinationBuilder<'_>

Begin an explicit-destination rule with action Deny.

Trait Implementations

impl Debug for RuleBuilder

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.