From f878f1893cb8446049c841d44ac8bbb711b52801 Mon Sep 17 00:00:00 2001
From: Sigvart Hovland <sigvart.m@gmail.com>
Date: Tue, 18 Aug 2026 15:05:23 +0200
Subject: [PATCH] feat: gate MLD behind multicast feature

For embedded devices it's important to have things configurable and
tunable to ensure that you don't use flash space for features you don't
use.
---
 src/iface/interface/ipv6.rs | 1 +
 src/wire/icmpv6.rs          | 4 ++++
 src/wire/mld.rs             | 2 +-
 3 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/src/iface/interface/ipv6.rs b/src/iface/interface/ipv6.rs
index 1bf6066b7..27795c36e 100644
--- a/src/iface/interface/ipv6.rs
+++ b/src/iface/interface/ipv6.rs
@@ -562,6 +562,7 @@ impl InterfaceInner {
         ))
     }
 
+    #[cfg(feature = "multicast")]
     pub(super) fn mldv2_report_packet<'any>(
         &self,
         records: &'any [MldAddressRecordRepr<'any>],
diff --git a/src/wire/icmpv6.rs b/src/wire/icmpv6.rs
index 3f6c6d58a..d47383ee1 100644
--- a/src/wire/icmpv6.rs
+++ b/src/wire/icmpv6.rs
@@ -605,6 +605,7 @@ pub enum Repr<'a> {
     },
     #[cfg(any(feature = "medium-ethernet", feature = "medium-ieee802154"))]
     Ndisc(NdiscRepr<'a>),
+    #[cfg(feature = "multicast")]
     Mld(MldRepr<'a>),
     #[cfg(feature = "proto-rpl")]
     Rpl(RplRepr<'a>),
@@ -698,6 +699,7 @@ impl<'a> Repr<'a> {
             }),
             #[cfg(any(feature = "medium-ethernet", feature = "medium-ieee802154"))]
             (msg_type, 0) if msg_type.is_ndisc() => NdiscRepr::parse(packet).map(Repr::Ndisc),
+            #[cfg(feature = "multicast")]
             (msg_type, 0) if msg_type.is_mld() => MldRepr::parse(packet).map(Repr::Mld),
             #[cfg(feature = "proto-rpl")]
             (Message::RplControl, _) => RplRepr::parse(packet).map(Repr::Rpl),
@@ -720,6 +722,7 @@ impl<'a> Repr<'a> {
             }
             #[cfg(any(feature = "medium-ethernet", feature = "medium-ieee802154"))]
             &Repr::Ndisc(ndisc) => ndisc.buffer_len(),
+            #[cfg(feature = "multicast")]
             &Repr::Mld(mld) => mld.buffer_len(),
             #[cfg(feature = "proto-rpl")]
             Repr::Rpl(rpl) => rpl.buffer_len(),
@@ -827,6 +830,7 @@ impl<'a> Repr<'a> {
             #[cfg(any(feature = "medium-ethernet", feature = "medium-ieee802154"))]
             Repr::Ndisc(ndisc) => ndisc.emit(packet),
 
+            #[cfg(feature = "multicast")]
             Repr::Mld(mld) => mld.emit(packet),
 
             #[cfg(feature = "proto-rpl")]
diff --git a/src/wire/mld.rs b/src/wire/mld.rs
index 968120897..d1d66652d 100644
--- a/src/wire/mld.rs
+++ b/src/wire/mld.rs
@@ -455,7 +455,7 @@ impl<'a> Repr<'a> {
     }
 }
 
-#[cfg(test)]
+#[cfg(all(test, feature = "multicast"))]
 mod test {
     use super::*;
     use crate::phy::ChecksumCapabilities;