Support tc flower ip tos

Author: daniel-noland

src/tc/filters/cls_flower.rs

@@ -211,6 +211,7 @@ pub type MplsBos = u8;
 pub type MplsTc = u8;
 pub type MplsLabel = u32;
 pub type TcpFlagsMask = u8;
+pub type IpTos = u8;
 
 bitflags! {
     // TcpFlags _ARE_ exactly 8 bits.
@@ -1370,6 +1371,7 @@ pub enum TcFilterFlowerOption {
     KeyMplsLabel(MplsLabel),
     KeyTcpFlags(TcpFlags),
     KeyTcpFlagsMask(TcpFlagsMask),
+    KeyIpTos(IpTos),
 }
 
 impl Nla for TcFilterFlowerOption {
@@ -1445,6 +1447,7 @@ impl Nla for TcFilterFlowerOption {
             Self::KeyMplsLabel(_) => 4,
             Self::KeyTcpFlags(_) => 2,
             Self::KeyTcpFlagsMask(_) => 2,
+            Self::KeyIpTos(_) => 1,
             Self::Other(attr) => attr.value_len(),
         }
     }
@@ -1525,6 +1528,7 @@ impl Nla for TcFilterFlowerOption {
             Self::KeyMplsLabel(_) => TCA_FLOWER_KEY_MPLS_LABEL,
             Self::KeyTcpFlags(_) => TCA_FLOWER_KEY_TCP_FLAGS,
             Self::KeyTcpFlagsMask(_) => TCA_FLOWER_KEY_TCP_FLAGS_MASK,
+            Self::KeyIpTos(_) => TCA_FLOWER_KEY_IP_TOS,
             Self::Other(attr) => attr.kind(),
         }
     }
@@ -1676,6 +1680,7 @@ impl Nla for TcFilterFlowerOption {
             Self::KeyTcpFlagsMask(flags) => {
                 buffer.copy_from_slice((*flags as u16).to_be_bytes().as_slice())
             }
+            Self::KeyIpTos(tos) => buffer.copy_from_slice(&[*tos].as_slice()),
             Self::Other(attr) => attr.emit_value(buffer),
         }
     }
@@ -2277,6 +2282,12 @@ impl<'a, T: AsRef<[u8]> + ?Sized> Parseable<NlaBuffer<&'a T>>
                 let flags = BigEndian::read_u16(payload);
                 Self::KeyTcpFlagsMask(flags as u8)
             }
+            TCA_FLOWER_KEY_IP_TOS => {
+                if payload.len() != 1 {
+                    return Err(DecodeError::from("invalid ip tos length"));
+                }
+                Self::KeyIpTos(payload[0])
+            }
             _ => Self::Other(
                 DefaultNla::parse(buf).context("failed to parse flower nla")?,
             ),