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|
use super::{DeserializationError, Expression, Rule};
use crate::sys::{self, libc};
use std::os::raw::c_char;
/// A meta expression refers to meta data associated with a packet.
#[derive(Debug, Copy, Clone, Eq, PartialEq)]
#[non_exhaustive]
pub enum Meta {
/// Packet ethertype protocol (skb->protocol), invalid in OUTPUT.
Protocol,
/// Packet mark.
Mark { set: bool },
/// Packet input interface index (dev->ifindex).
Iif,
/// Packet output interface index (dev->ifindex).
Oif,
/// Packet input interface name (dev->name).
IifName,
/// Packet output interface name (dev->name).
OifName,
/// Packet input interface type (dev->type).
IifType,
/// Packet output interface type (dev->type).
OifType,
/// Originating socket UID (fsuid).
SkUid,
/// Originating socket GID (fsgid).
SkGid,
/// Netfilter protocol (Transport layer protocol).
NfProto,
/// Layer 4 protocol number.
L4Proto,
/// Socket control group (skb->sk->sk_classid).
Cgroup,
/// A 32bit pseudo-random number.
PRandom,
}
impl Meta {
/// Returns the corresponding `NFT_*` constant for this meta expression.
pub fn to_raw_key(&self) -> u32 {
use Meta::*;
match *self {
Protocol => libc::NFT_META_PROTOCOL as u32,
Mark { .. } => libc::NFT_META_MARK as u32,
Iif => libc::NFT_META_IIF as u32,
Oif => libc::NFT_META_OIF as u32,
IifName => libc::NFT_META_IIFNAME as u32,
OifName => libc::NFT_META_OIFNAME as u32,
IifType => libc::NFT_META_IIFTYPE as u32,
OifType => libc::NFT_META_OIFTYPE as u32,
SkUid => libc::NFT_META_SKUID as u32,
SkGid => libc::NFT_META_SKGID as u32,
NfProto => libc::NFT_META_NFPROTO as u32,
L4Proto => libc::NFT_META_L4PROTO as u32,
Cgroup => libc::NFT_META_CGROUP as u32,
PRandom => libc::NFT_META_PRANDOM as u32,
}
}
fn from_raw(val: u32) -> Result<Self, DeserializationError> {
match val as i32 {
libc::NFT_META_PROTOCOL => Ok(Self::Protocol),
libc::NFT_META_MARK => Ok(Self::Mark { set: false }),
libc::NFT_META_IIF => Ok(Self::Iif),
libc::NFT_META_OIF => Ok(Self::Oif),
libc::NFT_META_IIFNAME => Ok(Self::IifName),
libc::NFT_META_OIFNAME => Ok(Self::OifName),
libc::NFT_META_IIFTYPE => Ok(Self::IifType),
libc::NFT_META_OIFTYPE => Ok(Self::OifType),
libc::NFT_META_SKUID => Ok(Self::SkUid),
libc::NFT_META_SKGID => Ok(Self::SkGid),
libc::NFT_META_NFPROTO => Ok(Self::NfProto),
libc::NFT_META_L4PROTO => Ok(Self::L4Proto),
libc::NFT_META_CGROUP => Ok(Self::Cgroup),
libc::NFT_META_PRANDOM => Ok(Self::PRandom),
_ => Err(DeserializationError::InvalidValue),
}
}
}
impl Expression for Meta {
fn get_raw_name() -> *const libc::c_char {
b"meta\0" as *const _ as *const c_char
}
fn from_expr(expr: *const sys::nftnl_expr) -> Result<Self, DeserializationError>
where
Self: Sized,
{
unsafe {
let mut ret = Self::from_raw(sys::nftnl_expr_get_u32(
expr,
sys::NFTNL_EXPR_META_KEY as u16,
))?;
if let Self::Mark { ref mut set } = ret {
*set = sys::nftnl_expr_is_set(expr, sys::NFTNL_EXPR_META_SREG as u16);
}
Ok(ret)
}
}
fn to_expr(&self, _rule: &Rule) -> *mut sys::nftnl_expr {
unsafe {
let expr = try_alloc!(sys::nftnl_expr_alloc(Self::get_raw_name()));
if let Meta::Mark { set: true } = self {
sys::nftnl_expr_set_u32(
expr,
sys::NFTNL_EXPR_META_SREG as u16,
libc::NFT_REG_1 as u32,
);
} else {
sys::nftnl_expr_set_u32(
expr,
sys::NFTNL_EXPR_META_DREG as u16,
libc::NFT_REG_1 as u32,
);
}
sys::nftnl_expr_set_u32(expr, sys::NFTNL_EXPR_META_KEY as u16, self.to_raw_key());
expr
}
}
}
#[macro_export]
macro_rules! nft_expr_meta {
(proto) => {
$crate::expr::Meta::Protocol
};
(mark set) => {
$crate::expr::Meta::Mark { set: true }
};
(mark) => {
$crate::expr::Meta::Mark { set: false }
};
(iif) => {
$crate::expr::Meta::Iif
};
(oif) => {
$crate::expr::Meta::Oif
};
(iifname) => {
$crate::expr::Meta::IifName
};
(oifname) => {
$crate::expr::Meta::OifName
};
(iiftype) => {
$crate::expr::Meta::IifType
};
(oiftype) => {
$crate::expr::Meta::OifType
};
(skuid) => {
$crate::expr::Meta::SkUid
};
(skgid) => {
$crate::expr::Meta::SkGid
};
(nfproto) => {
$crate::expr::Meta::NfProto
};
(l4proto) => {
$crate::expr::Meta::L4Proto
};
(cgroup) => {
$crate::expr::Meta::Cgroup
};
(random) => {
$crate::expr::Meta::PRandom
};
}
|
