1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
use crate::endpoint;
use alloc::collections::VecDeque;
use s2n_quic_core::{
event, inet::ExplicitCongestionNotification, io::tx, packet, path, path::MINIMUM_MTU, random,
stateless_reset, time,
};
#[derive(Debug)]
pub struct Dispatch<Path: path::Handle> {
transmissions: VecDeque<Transmission<Path>>,
}
impl<Path: path::Handle> Default for Dispatch<Path> {
fn default() -> Self {
Self::new(endpoint::DEFAULT_MAX_PEERS)
}
}
impl<Path: path::Handle> Dispatch<Path> {
pub fn new(max_peers: usize) -> Self {
Self {
transmissions: VecDeque::with_capacity(max_peers),
}
}
pub fn queue<R: random::Generator>(
&mut self,
path: Path,
token: stateless_reset::Token,
max_tag_len: usize,
triggering_packet_len: usize,
random_generator: &mut R,
) {
if let Some(transmission) = Transmission::new(
path,
token,
max_tag_len,
triggering_packet_len,
random_generator,
) {
self.transmissions.push_back(transmission);
}
}
pub fn on_transmit<Tx: tx::Queue<Handle = Path>, Pub: event::EndpointPublisher>(
&mut self,
queue: &mut Tx,
publisher: &mut Pub,
) {
while let Some(transmission) = self.transmissions.pop_front() {
match queue.push(&transmission) {
Ok(tx::Outcome { len, .. }) => {
publisher.on_endpoint_packet_sent(event::builder::EndpointPacketSent {
packet_header: event::builder::PacketHeader::StatelessReset {},
});
publisher.on_endpoint_datagram_sent(event::builder::EndpointDatagramSent {
len: len as u16,
gso_offset: 0,
});
}
Err(_) => {
self.transmissions.push_front(transmission);
return;
}
}
}
}
}
pub struct Transmission<Path: path::Handle> {
path: Path,
packet: [u8; MINIMUM_MTU as usize],
packet_len: usize,
}
impl<Handle: path::Handle> core::fmt::Debug for Transmission<Handle> {
fn fmt(&self, f: &mut core::fmt::Formatter<'_>) -> core::fmt::Result {
f.debug_struct("Transmission")
.field("remote_address", &self.path.remote_address())
.field("local_address", &self.path.local_address())
.field("packet_len", &self.packet_len)
.field("packet", &&self.packet[0..self.packet_len])
.finish()
}
}
impl<Path: path::Handle> Transmission<Path> {
pub fn new<R: random::Generator>(
path: Path,
token: stateless_reset::Token,
max_tag_len: usize,
triggering_packet_len: usize,
random_generator: &mut R,
) -> Option<Self> {
let mut packet_buf = [0u8; MINIMUM_MTU as usize];
let packet_len = packet::stateless_reset::encode_packet(
token,
max_tag_len,
triggering_packet_len,
random_generator,
&mut packet_buf,
)?;
Some(Self {
path,
packet: packet_buf,
packet_len,
})
}
}
impl<Path: path::Handle> AsRef<[u8]> for Transmission<Path> {
fn as_ref(&self) -> &[u8] {
&self.packet[..self.packet_len]
}
}
impl<Path: path::Handle> tx::Message for &Transmission<Path> {
type Handle = Path;
#[inline]
fn path_handle(&self) -> &Self::Handle {
&self.path
}
#[inline]
fn ecn(&mut self) -> ExplicitCongestionNotification {
Default::default()
}
#[inline]
fn delay(&mut self) -> time::Duration {
Default::default()
}
#[inline]
fn ipv6_flow_label(&mut self) -> u32 {
0
}
#[inline]
fn can_gso(&self, segment_len: usize, _segment_count: usize) -> bool {
segment_len >= self.as_ref().len()
}
#[inline]
fn write_payload(
&mut self,
mut buffer: tx::PayloadBuffer,
_gso_offset: usize,
) -> Result<usize, tx::Error> {
buffer.write(self.as_ref())
}
}
