add support for rt expression

3 files changed, 45 insertions, 1 deletions

diff --git a/src/error.rs b/src/error.rs
index fa0e26f..646b482 100644
--- a/src/error.rs
+++ b/src/error.rs
@@ -49,6 +49,9 @@ pub enum DecodeError {
     #[error("Unsupported value for an icmp reject type")]
     UnknownRejectType(u32),
 
+    #[error("Invalid type for a rt expression")]
+    UnknownRtKey(u32),
+
     #[error("Unsupported value for an icmp code in a reject expression")]
     UnknownIcmpCode(u8),
 
diff --git a/src/expr/mod.rs b/src/expr/mod.rs
index 9b8b9e6..6acc7c5 100644
--- a/src/expr/mod.rs
+++ b/src/expr/mod.rs
@@ -54,6 +54,9 @@ pub use self::reject::{IcmpCode, Reject, RejectType};
 mod register;
 pub use self::register::Register;
 
+mod rt;
+pub use self::rt::*;
+
 mod verdict;
 pub use self::verdict::*;
 
@@ -184,7 +187,8 @@ create_expr_variant!(
     [Meta, Meta],
     [Nat, Nat],
     [Payload, Payload],
-    [Reject, Reject]
+    [Reject, Reject],
+    [Rt, Rt]
 );
 
 pub type ExpressionList = NfNetlinkList<RawExpression>;
diff --git a/src/expr/rt.rs b/src/expr/rt.rs
new file mode 100644
index 0000000..5ed9272
--- /dev/null
+++ b/src/expr/rt.rs
@@ -0,0 +1,37 @@
+use rustables_macros::{nfnetlink_enum, nfnetlink_struct};
+
+use crate::sys::{
+    NFTA_RT_DREG, NFTA_RT_KEY, NFT_RT_CLASSID, NFT_RT_NEXTHOP4, NFT_RT_NEXTHOP6, NFT_RT_TCPMSS,
+};
+
+use super::{Expression, Register};
+
+/// Kind of routing information.
+#[derive(Debug, Copy, Clone, Eq, PartialEq)]
+#[nfnetlink_enum(u32, nested = true)]
+pub enum RtKey {
+    /// Class ID.
+    ClassID = NFT_RT_CLASSID,
+    /// Next IPv4 hop.
+    NextHop4 = NFT_RT_NEXTHOP4,
+    /// Next IPv6 hop.
+    NextHop6 = NFT_RT_NEXTHOP6,
+    /// TCP MSS.
+    TCPMSS = NFT_RT_TCPMSS,
+}
+
+/// Loads routing information into a register.
+#[derive(Default, Debug, Clone, PartialEq, Eq)]
+#[nfnetlink_struct(nested = true)]
+pub struct Rt {
+    #[field(NFTA_RT_DREG)]
+    dreg: Register,
+    #[field(NFTA_RT_KEY)]
+    key: RtKey,
+}
+
+impl Expression for Rt {
+    fn get_name() -> &'static str {
+        "rt"
+    }
+}