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std::net: clamp multicast ttl value to u8 max. #154113

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Merged
rust-bors merged 4 commits into from
Sep 14, 2026
Merged

std::net: clamp multicast ttl value to u8 max. #154113

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a29d5cf
std::net: clamp multicast ttl value to u8 max.
devnexen Mar 19, 2026
80bae85
addressing feedback
devnexen Mar 19, 2026
1e444b4
address feedback
devnexen Mar 31, 2026
6f30978
convert to u8 early on before casting to the platform type
devnexen Apr 2, 2026
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3 changes: 3 additions & 0 deletions library/std/src/net/udp.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -478,6 +478,9 @@ impl UdpSocket {
///
/// Note that this might not have any effect on IPv6 sockets.
///
/// Since the underlying socket option value is byte-sized,
/// any value above 255 will result in an error.
///
/// # Examples
///
/// ```no_run
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10 changes: 4 additions & 6 deletions library/std/src/sys/net/connection/socket/mod.rs
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Expand Up @@ -759,13 +759,11 @@ impl UdpSocket {
}

pub fn set_multicast_ttl_v4(&self, multicast_ttl_v4: u32) -> io::Result<()> {
let ttl: u8 = multicast_ttl_v4
.try_into()
.map_err(|_| io::Error::from(io::ErrorKind::InvalidInput))?;
unsafe {
setsockopt(
&self.inner,
c::IPPROTO_IP,
c::IP_MULTICAST_TTL,
multicast_ttl_v4 as IpV4MultiCastType,
)
setsockopt(&self.inner, c::IPPROTO_IP, c::IP_MULTICAST_TTL, ttl as IpV4MultiCastType)
}
}

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