add IPPROTO_SCTP as protocol option

Author: nathaniel-bennett

src/lib.rs

@@ -306,6 +306,16 @@ impl Protocol {
     #[cfg(target_os = "linux")]
     /// Protocol corresponding to `MPTCP`.
     pub const MPTCP: Protocol = Protocol(sys::IPPROTO_MPTCP);
+
+    #[cfg(all(
+        feature = "all",
+        any(
+            target_os = "freebsd",
+            target_os = "linux",
+        )
+    ))]
+    /// Protocol corresponding to `SCTP`.
+    pub const SCTP: Protocol = Protocol(sys::IPPROTO_SCTP);
 }
 
 impl From<c_int> for Protocol {

src/sys/unix.rs

@@ -65,6 +65,14 @@ pub(crate) use libc::{SOCK_DGRAM, SOCK_STREAM};
 // Used in `Protocol`.
 #[cfg(target_os = "linux")]
 pub(crate) use libc::IPPROTO_MPTCP;
+#[cfg(all(
+    feature = "all",
+    any(
+        target_os = "freebsd",
+        target_os = "linux",
+    )
+))]
+pub(crate) use libc::IPPROTO_SCTP;
 pub(crate) use libc::{IPPROTO_ICMP, IPPROTO_ICMPV6, IPPROTO_TCP, IPPROTO_UDP};
 // Used in `SockAddr`.
 pub(crate) use libc::{
@@ -390,6 +398,14 @@ impl_debug!(
     libc::IPPROTO_UDP,
     #[cfg(target_os = "linux")]
     libc::IPPROTO_MPTCP,
+    #[cfg(all(
+        feature = "all",
+        any(
+            target_os = "freebsd",
+            target_os = "linux",
+        )
+    ))]
+    libc::IPPROTO_SCTP,
 );
 
 /// Unix-only API.

tests/socket.rs

@@ -108,6 +108,14 @@ fn protocol_fmt_debug() {
         (Protocol::UDP, "IPPROTO_UDP"),
         #[cfg(target_os = "linux")]
         (Protocol::MPTCP, "IPPROTO_MPTCP"),
+        #[cfg(all(
+            feature = "all",
+            any(
+                target_os = "freebsd",
+                target_os = "linux",
+            )
+        ))]
+        (Protocol::SCTP, "IPPROTO_SCTP"),
         (500.into(), "500"),
     ];