netlink_packet_route/rule/
message.rs

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// SPDX-License-Identifier: MIT

use super::{RuleAttribute, RuleError, RuleHeader, RuleMessageBuffer};
use netlink_packet_utils::traits::{Emitable, Parseable};

#[derive(Debug, PartialEq, Eq, Clone, Default)]
#[non_exhaustive]
pub struct RuleMessage {
    pub header: RuleHeader,
    pub attributes: Vec<RuleAttribute>,
}

impl Emitable for RuleMessage {
    fn buffer_len(&self) -> usize {
        self.header.buffer_len() + self.attributes.as_slice().buffer_len()
    }

    fn emit(&self, buffer: &mut [u8]) {
        self.header.emit(buffer);
        self.attributes.as_slice().emit(&mut buffer[self.header.buffer_len()..]);
    }
}

impl<'a, T: AsRef<[u8]> + 'a> Parseable<RuleMessageBuffer<&'a T>> for RuleMessage {
    type Error = RuleError;
    fn parse(buf: &RuleMessageBuffer<&'a T>) -> Result<Self, RuleError> {
        // unwrap: RuleHeader never fails to parse.
        let header = RuleHeader::parse(buf).unwrap();
        let attributes = Vec::<RuleAttribute>::parse(buf)?;
        Ok(RuleMessage { header, attributes })
    }
}

impl<'a, T: AsRef<[u8]> + 'a> Parseable<RuleMessageBuffer<&'a T>> for Vec<RuleAttribute> {
    type Error = RuleError;
    fn parse(buf: &RuleMessageBuffer<&'a T>) -> Result<Self, RuleError> {
        let mut attributes = vec![];
        for nla_buf in buf.attributes() {
            attributes.push(RuleAttribute::parse(&nla_buf?)?);
        }
        Ok(attributes)
    }
}