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In Repr::emit, do not assume that the packet is pre-zeroed.

This commit is contained in:
whitequark 2016-12-20 09:41:08 +00:00
parent 77b2819691
commit 31040bf0fc
2 changed files with 17 additions and 0 deletions
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10
src/wire/ipv4.rs
View File

@ -266,6 +266,15 @@ impl<T: AsRef<[u8]> + AsMut<[u8]>> Packet<T> {
NetworkEndian::write_u16(&mut data[field::IDENT], value)
}
/// Clear the entire flags field.
#[inline(always)]
pub fn clear_flags(&mut self) {
let data = self.buffer.as_mut();
let raw = NetworkEndian::read_u16(&data[field::FLG_OFF]);
let raw = raw & !0xe000;
NetworkEndian::write_u16(&mut data[field::FLG_OFF], raw);
}
/// Set the "don't fragment" flag.
#[inline(always)]
pub fn set_dont_frag(&mut self, value: bool) {
@ -398,6 +407,7 @@ impl Repr {
let total_len = packet.header_len() as u16 + payload_len as u16;
packet.set_total_len(total_len);
packet.set_ident(0);
packet.clear_flags();
packet.set_more_frags(false);
packet.set_dont_frag(true);
packet.set_frag_offset(0);

7
src/wire/tcp.rs
View File

@ -235,6 +235,13 @@ impl<T: AsRef<[u8]> + AsMut<[u8]>> Packet<T> {
NetworkEndian::write_u32(&mut data[field::ACK_NUM], value)
}
/// Clear the entire flags field.
#[inline(always)]
pub fn clear_flags(&mut self) {
let data = self.buffer.as_mut();
NetworkEndian::write_u16(&mut data[field::FLAGS], 0)
}
/// Set the FIN flag.
#[inline(always)]
pub fn set_fin(&mut self, value: bool) {