feat: 握手写完了
This commit is contained in:
parent
1f5be02810
commit
c5efd76773
1
.gitignore
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.gitignore
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/target
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/joh_git
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627
Cargo.lock
generated
627
Cargo.lock
generated
@ -2,6 +2,633 @@
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|
||||
checksum = "87b1395334443abca552f63d4f61d0486f12377c2ba8b368e523f89e828cffd4"
|
||||
dependencies = [
|
||||
"bytes",
|
||||
"futures",
|
||||
"iovec",
|
||||
"log",
|
||||
"mio",
|
||||
"scoped-tls",
|
||||
"tokio",
|
||||
"tokio-executor",
|
||||
"tokio-io",
|
||||
"tokio-reactor",
|
||||
"tokio-timer",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "tokio-current-thread"
|
||||
version = "0.1.7"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "b1de0e32a83f131e002238d7ccde18211c0a5397f60cbfffcb112868c2e0e20e"
|
||||
dependencies = [
|
||||
"futures",
|
||||
"tokio-executor",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "tokio-executor"
|
||||
version = "0.1.10"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "fb2d1b8f4548dbf5e1f7818512e9c406860678f29c300cdf0ebac72d1a3a1671"
|
||||
dependencies = [
|
||||
"crossbeam-utils",
|
||||
"futures",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "tokio-fs"
|
||||
version = "0.1.7"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "297a1206e0ca6302a0eed35b700d292b275256f596e2f3fea7729d5e629b6ff4"
|
||||
dependencies = [
|
||||
"futures",
|
||||
"tokio-io",
|
||||
"tokio-threadpool",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "tokio-io"
|
||||
version = "0.1.13"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "57fc868aae093479e3131e3d165c93b1c7474109d13c90ec0dda2a1bbfff0674"
|
||||
dependencies = [
|
||||
"bytes",
|
||||
"futures",
|
||||
"log",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "tokio-reactor"
|
||||
version = "0.1.12"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "09bc590ec4ba8ba87652da2068d150dcada2cfa2e07faae270a5e0409aa51351"
|
||||
dependencies = [
|
||||
"crossbeam-utils",
|
||||
"futures",
|
||||
"lazy_static",
|
||||
"log",
|
||||
"mio",
|
||||
"num_cpus",
|
||||
"parking_lot",
|
||||
"slab",
|
||||
"tokio-executor",
|
||||
"tokio-io",
|
||||
"tokio-sync",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "tokio-sync"
|
||||
version = "0.1.8"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "edfe50152bc8164fcc456dab7891fa9bf8beaf01c5ee7e1dd43a397c3cf87dee"
|
||||
dependencies = [
|
||||
"fnv",
|
||||
"futures",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "tokio-tcp"
|
||||
version = "0.1.4"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "98df18ed66e3b72e742f185882a9e201892407957e45fbff8da17ae7a7c51f72"
|
||||
dependencies = [
|
||||
"bytes",
|
||||
"futures",
|
||||
"iovec",
|
||||
"mio",
|
||||
"tokio-io",
|
||||
"tokio-reactor",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "tokio-threadpool"
|
||||
version = "0.1.18"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "df720b6581784c118f0eb4310796b12b1d242a7eb95f716a8367855325c25f89"
|
||||
dependencies = [
|
||||
"crossbeam-deque",
|
||||
"crossbeam-queue",
|
||||
"crossbeam-utils",
|
||||
"futures",
|
||||
"lazy_static",
|
||||
"log",
|
||||
"num_cpus",
|
||||
"slab",
|
||||
"tokio-executor",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "tokio-timer"
|
||||
version = "0.2.13"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "93044f2d313c95ff1cb7809ce9a7a05735b012288a888b62d4434fd58c94f296"
|
||||
dependencies = [
|
||||
"crossbeam-utils",
|
||||
"futures",
|
||||
"slab",
|
||||
"tokio-executor",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "tokio-udp"
|
||||
version = "0.1.6"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "e2a0b10e610b39c38b031a2fcab08e4b82f16ece36504988dcbd81dbba650d82"
|
||||
dependencies = [
|
||||
"bytes",
|
||||
"futures",
|
||||
"log",
|
||||
"mio",
|
||||
"tokio-codec",
|
||||
"tokio-io",
|
||||
"tokio-reactor",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "tokio-uds"
|
||||
version = "0.2.7"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "ab57a4ac4111c8c9dbcf70779f6fc8bc35ae4b2454809febac840ad19bd7e4e0"
|
||||
dependencies = [
|
||||
"bytes",
|
||||
"futures",
|
||||
"iovec",
|
||||
"libc",
|
||||
"log",
|
||||
"mio",
|
||||
"mio-uds",
|
||||
"tokio-codec",
|
||||
"tokio-io",
|
||||
"tokio-reactor",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "tun-tap"
|
||||
version = "0.1.4"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "9a477a4e9367c72ac875d23cd07ac99ffa932497d8428767fed0cfa27bbabe50"
|
||||
dependencies = [
|
||||
"cc",
|
||||
"futures",
|
||||
"libc",
|
||||
"mio",
|
||||
"tokio-core",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "winapi"
|
||||
version = "0.2.8"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "167dc9d6949a9b857f3451275e911c3f44255842c1f7a76f33c55103a909087a"
|
||||
|
||||
[[package]]
|
||||
name = "winapi"
|
||||
version = "0.3.9"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "5c839a674fcd7a98952e593242ea400abe93992746761e38641405d28b00f419"
|
||||
dependencies = [
|
||||
"winapi-i686-pc-windows-gnu",
|
||||
"winapi-x86_64-pc-windows-gnu",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "winapi-build"
|
||||
version = "0.1.1"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "2d315eee3b34aca4797b2da6b13ed88266e6d612562a0c46390af8299fc699bc"
|
||||
|
||||
[[package]]
|
||||
name = "winapi-i686-pc-windows-gnu"
|
||||
version = "0.4.0"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "ac3b87c63620426dd9b991e5ce0329eff545bccbbb34f3be09ff6fb6ab51b7b6"
|
||||
|
||||
[[package]]
|
||||
name = "winapi-x86_64-pc-windows-gnu"
|
||||
version = "0.4.0"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f"
|
||||
|
||||
[[package]]
|
||||
name = "ws2_32-sys"
|
||||
version = "0.2.1"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "d59cefebd0c892fa2dd6de581e937301d8552cb44489cdff035c6187cb63fa5e"
|
||||
dependencies = [
|
||||
"winapi 0.2.8",
|
||||
"winapi-build",
|
||||
]
|
||||
|
||||
@ -4,3 +4,5 @@ version = "0.1.0"
|
||||
edition = "2021"
|
||||
|
||||
[dependencies]
|
||||
etherparse = "0.17.0"
|
||||
tun-tap = "0.1.4"
|
||||
|
||||
69
examples/bin.rs
Normal file
69
examples/bin.rs
Normal file
@ -0,0 +1,69 @@
|
||||
use rs_tcp::*;
|
||||
use std::{
|
||||
collections::{hash_map::Entry, HashMap},
|
||||
io,
|
||||
};
|
||||
|
||||
fn main() -> io::Result<()> {
|
||||
let mut nic = tun_tap::Iface::without_packet_info("mytun0", tun_tap::Mode::Tun)?;
|
||||
let mut buffer = vec![0; 1500];
|
||||
// 保存所有连接对应的状态
|
||||
let mut connections: HashMap<Quad, Connection> = HashMap::new();
|
||||
|
||||
loop {
|
||||
let nbytes = nic.recv(&mut buffer).unwrap();
|
||||
// 忽略非TCP数据包
|
||||
match etherparse::Ipv4HeaderSlice::from_slice(&buffer) {
|
||||
Ok(iph) => {
|
||||
let src = iph.source_addr();
|
||||
let dst = iph.destination_addr();
|
||||
let proto = iph.protocol();
|
||||
if proto != etherparse::IpNumber(0x06) {
|
||||
continue;
|
||||
}
|
||||
match etherparse::TcpHeaderSlice::from_slice(&buffer[iph.slice().len()..nbytes]) {
|
||||
Ok(tcph) => {
|
||||
let payload_offset = iph.slice().len() + tcph.slice().len();
|
||||
let mut payload = &buffer[payload_offset..nbytes];
|
||||
|
||||
let recv_quad = Quad {
|
||||
src: (src, tcph.source_port()),
|
||||
dst: (dst, tcph.destination_port()),
|
||||
};
|
||||
// 这里我们需要处理接收到的Tcp数据包
|
||||
match connections.entry(recv_quad) {
|
||||
Entry::Occupied(mut occupied_entry) => {
|
||||
// 已经存在的连接
|
||||
occupied_entry.get_mut().on_packet(iph, tcph, &payload);
|
||||
},
|
||||
Entry::Vacant(vacant_entry) => {
|
||||
eprintln!(
|
||||
"{}:{} -> {}:{} first handpacket syn: {}, seq: {}",
|
||||
src,
|
||||
tcph.source_port(),
|
||||
dst,
|
||||
tcph.destination_port(),
|
||||
tcph.syn(),
|
||||
tcph.sequence_number()
|
||||
);
|
||||
// 第一次接受的包
|
||||
if let Some(c) = Connection::accept(&mut nic, iph, tcph)?{
|
||||
vacant_entry.insert(c);
|
||||
}
|
||||
},
|
||||
}
|
||||
}
|
||||
Err(e) => {
|
||||
// 这不是一个TCP包 但是协议是TCP
|
||||
eprintln!("ignoring weird packet: {:?}", e)
|
||||
}
|
||||
}
|
||||
}
|
||||
Err(_) => {
|
||||
// 非IP标准包 忽略
|
||||
continue;
|
||||
}
|
||||
};
|
||||
}
|
||||
Ok(())
|
||||
}
|
||||
7
readme.md
Normal file
7
readme.md
Normal file
@ -0,0 +1,7 @@
|
||||
# rs-tcp
|
||||
|
||||
使用`rust`从底层网络链路实现`TCP`协议。
|
||||
|
||||
```bash
|
||||
git remote add origin ssh://git@81.70.52.148:17022/asahi/rs-tcp.git
|
||||
```
|
||||
13
run.sh
Executable file
13
run.sh
Executable file
@ -0,0 +1,13 @@
|
||||
#!/bin/bash
|
||||
cargo build --example bin -r
|
||||
ext=$?
|
||||
if [[ $ext -ne 0 ]]; then
|
||||
exit $ext
|
||||
fi
|
||||
sudo setcap cap_net_admin=eip ./target/release/examples/bin
|
||||
./target/release/examples/bin &
|
||||
pid=$!
|
||||
sudo ip addr add 192.168.0.1/24 dev mytun0
|
||||
sudo ip link set up dev mytun0
|
||||
trap "kill $pid" INT TERM
|
||||
wait $pid
|
||||
165
src/lib.rs
165
src/lib.rs
@ -1,14 +1,161 @@
|
||||
pub fn add(left: u64, right: u64) -> u64 {
|
||||
left + right
|
||||
use std::{io, net::Ipv4Addr};
|
||||
|
||||
#[derive(Clone, Copy, Debug, Hash, Eq, PartialEq)]
|
||||
pub struct Quad {
|
||||
pub src: (Ipv4Addr, u16),
|
||||
pub dst: (Ipv4Addr, u16),
|
||||
}
|
||||
|
||||
#[cfg(test)]
|
||||
mod tests {
|
||||
use super::*;
|
||||
#[derive(Debug)]
|
||||
pub enum State {
|
||||
//Listen,
|
||||
SynRcvd,
|
||||
Estab,
|
||||
FinWait1,
|
||||
FinWait2,
|
||||
TimeWait,
|
||||
}
|
||||
/// 对于一个连接,我们需要保存其中的状态上下文
|
||||
/// 主要是滑动窗口部分的状态
|
||||
pub struct RecvStateContext {
|
||||
/// 下一个接受的seq值
|
||||
pub nxt: u32,
|
||||
/// 窗口大小
|
||||
pub wnd: u16,
|
||||
/// 由对方设置的初始接受序列号
|
||||
pub irs: u32,
|
||||
}
|
||||
/// 一个连接既可以是接受方,也可以是发送方
|
||||
/// 所以还需要一个结构保存发送时的状态信息
|
||||
pub struct SendStateContext {
|
||||
/// 滑动窗口的左边界指针
|
||||
pub una: u32,
|
||||
/// 存放下一个发送的seq值
|
||||
pub nxt: u32,
|
||||
/// 发送方窗口大小
|
||||
pub wnd: u16,
|
||||
/// 由自己设置的初始发送序列号
|
||||
pub iss: u32,
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn it_works() {
|
||||
let result = add(2, 2);
|
||||
assert_eq!(result, 4);
|
||||
pub struct Connection {
|
||||
state: State,
|
||||
send: SendStateContext,
|
||||
recv: RecvStateContext,
|
||||
iph: etherparse::Ipv4Header
|
||||
}
|
||||
impl Connection {
|
||||
pub fn on_packet<'a>(
|
||||
&mut self,
|
||||
iph: etherparse::Ipv4HeaderSlice<'a>,
|
||||
tcph: etherparse::TcpHeaderSlice<'a>,
|
||||
data: &'a [u8],
|
||||
) {
|
||||
// 需要检查是否接受
|
||||
// SND.UNA < SEG.ACK <= SND.NXT
|
||||
let ack = tcph.acknowledgment_number();
|
||||
if !is_cyclic_order(self.send.una, ack, self.send.nxt.wrapping_add(1)){
|
||||
eprintln!("不在可接受的范围！");
|
||||
return;
|
||||
}
|
||||
match self.state {
|
||||
State::SynRcvd => {
|
||||
eprintln!("接收到第三次握手包！");
|
||||
|
||||
self.state = State::Estab;
|
||||
},
|
||||
State::Estab => {
|
||||
// 握手结束
|
||||
// TODO: 3:31:04 开始编写结束连接
|
||||
},
|
||||
State::FinWait1 => todo!(),
|
||||
State::FinWait2 => todo!(),
|
||||
State::TimeWait => todo!(),
|
||||
}
|
||||
}
|
||||
|
||||
pub fn accept<'a>(
|
||||
nic: &'a mut tun_tap::Iface,
|
||||
iph: etherparse::Ipv4HeaderSlice<'a>,
|
||||
tcph: etherparse::TcpHeaderSlice<'a>,
|
||||
) -> io::Result<Option<Self>> {
|
||||
let mut buf = [0u8; 1500];
|
||||
// 回应握手包
|
||||
if !tcph.syn() {
|
||||
// 只响应syn数据包
|
||||
return Ok(None);
|
||||
}
|
||||
let iss = 0;
|
||||
let wnd = 1024;
|
||||
let mut c = Connection {
|
||||
state: State::SynRcvd,
|
||||
send: SendStateContext{
|
||||
iss,
|
||||
una: iss,
|
||||
nxt: iss,
|
||||
wnd,
|
||||
},
|
||||
recv: RecvStateContext{
|
||||
irs: tcph.sequence_number(),
|
||||
nxt: tcph.sequence_number() + 1,
|
||||
wnd: tcph.window_size(),
|
||||
},
|
||||
iph: etherparse::Ipv4Header::new(
|
||||
0,
|
||||
64,
|
||||
etherparse::IpNumber::TCP,
|
||||
iph.destination(),
|
||||
iph.source(),
|
||||
).expect("create ip header fail!")
|
||||
};
|
||||
|
||||
// 准备回复SYN+ACK 握手包
|
||||
let mut syn_ack = etherparse::TcpHeader::new(
|
||||
tcph.destination_port(),
|
||||
tcph.source_port(),
|
||||
c.send.iss,
|
||||
10,
|
||||
);
|
||||
// acknowledgment_number 期望接收的下一个字节的序号
|
||||
syn_ack.acknowledgment_number = tcph.sequence_number() + 1;
|
||||
syn_ack.ack = true;
|
||||
syn_ack.syn = true;
|
||||
c.iph.set_payload_len(syn_ack.header_len());
|
||||
let unwritten = {
|
||||
let mut unwritten = &mut buf[..];
|
||||
c.iph.write(&mut unwritten);
|
||||
syn_ack.write(&mut unwritten);
|
||||
unwritten.len()
|
||||
};
|
||||
nic.send(&buf[..unwritten])?;
|
||||
Ok(Some(c))
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
/// 判断三个无符号整数是否按顺时针方向形成环形递增顺序
|
||||
///
|
||||
/// # 参数
|
||||
/// - `start`：起始点
|
||||
/// - `middle`：中间点（预期在 `start` 顺时针方向）
|
||||
/// - `end`：终点（预期在 `middle` 顺时针方向）
|
||||
///
|
||||
/// # 返回值
|
||||
/// 如果满足 `start → middle → end` 的顺时针递增顺序（允许溢出环绕），返回 `true`
|
||||
fn is_cyclic_order(start: u32, middle: u32, end: u32) -> bool {
|
||||
// 计算环形空间的最大半值（超过此值代表逆时针方向更短）
|
||||
let half_max_value = u32::MAX / 2 + 1;
|
||||
|
||||
// 计算各点间的顺时针距离（考虑溢出）
|
||||
let start_to_middle_distance = middle.wrapping_sub(start);
|
||||
let middle_to_end_distance = end.wrapping_sub(middle);
|
||||
let start_to_end_distance = end.wrapping_sub(start);
|
||||
|
||||
// 验证条件：
|
||||
// 1. start到middle的顺时针距离不超过半环
|
||||
// 2. middle到end的顺时针距离不超过半环
|
||||
// 3. start到end的总距离等于前两段距离之和（确保连续性）
|
||||
start_to_middle_distance <= half_max_value &&
|
||||
middle_to_end_distance <= half_max_value &&
|
||||
start_to_end_distance == start_to_middle_distance + middle_to_end_distance
|
||||
}
|
||||
3
tests/test.rs
Normal file
3
tests/test.rs
Normal file
@ -0,0 +1,3 @@
|
||||
#[cfg(test)]
|
||||
mod tests {
|
||||
}
|
||||
84
work.md
Normal file
84
work.md
Normal file
@ -0,0 +1,84 @@
|
||||
# 开始
|
||||
|
||||
## 架构相关
|
||||
|
||||
### 依赖
|
||||
|
||||
- `tun_tap`: 创建低级网络设备的`crate`。
|
||||
- `tshark`: `wireshark`的终端版本，安装`wireshark`自己会带。
|
||||
- `etherparse`:用来解析`Tcp`和`IP`部分，并且提供了简便访问成员的封装。
|
||||
|
||||
### 传输链路
|
||||
|
||||
```mermaid
|
||||
graph LR
|
||||
A[TUN 接口] --> B(接收 IP 数据包);
|
||||
B --> C{解析 IP 数据包};
|
||||
C --> D[解析 TCP 头部];
|
||||
D --> E[解析 TCP 数据体];
|
||||
E --> F{你的逻辑处理};
|
||||
F --> G[构造 IP 数据包];
|
||||
G --> H[包装 TCP 结构];
|
||||
H --> I(通过 TUN 发送);
|
||||
I --> A;
|
||||
|
||||
style A fill:#f9f,stroke:#333,stroke-width:2px
|
||||
style I fill:#3e89,stroke:#333,stroke-width:2px
|
||||
style F fill:#05aa20,stroke:#333,stroke-width:2px
|
||||
|
||||
classDef process fill:#fffff,stroke:#ffff,stroke-width:1px
|
||||
class C,D,E,G,H process
|
||||
```
|
||||
|
||||
使用`TUN`模式进行低级网络传输。我们从`NIC`中获取到的是一个`IP`数据包。
|
||||
|
||||
具体流程，我们需要先解析这个`IP`数据包，然后解析其中的数据，将它作为`TCP`进行解析，最终我们将我们的数据包装为`IP`数据包，然后传输到`TUN`中，实现通信。
|
||||
|
||||
### 项目测试
|
||||
|
||||
我们在`example/bin.rs`中编写我们的启动测试主程序。`tests`目录主要是用来编写单元测试。
|
||||
|
||||
```bash
|
||||
#!/bin/bash
|
||||
cargo build --example bin -r
|
||||
ext=$?
|
||||
if [[ $ext -ne 0 ]]; then
|
||||
exit $ext
|
||||
fi
|
||||
sudo setcap cap_net_admin=eip ./target/release/examples/bin # 赋予程序网络控制权限，因为要创建tun接口
|
||||
./target/release/examples/bin &
|
||||
pid=$!
|
||||
echo $pid
|
||||
sudo ip addr add 192.168.0.1/24 dev mytun0 # 为我们的虚拟网卡绑定IP和掩码
|
||||
sudo ip link set up dev mytun0 # 激活设备
|
||||
trap "kill $pid" INT TERM
|
||||
wait $pid
|
||||
```
|
||||
|
||||
#### 抓包
|
||||
|
||||
```bash
|
||||
sudo tshark -i mytun0 # 使用tshark监听mytun0设备
|
||||
```
|
||||
|
||||
|
||||
|
||||
## 开始编写
|
||||
|
||||
### 滑动窗口
|
||||
|
||||
**接受方滑动窗口**
|
||||
|
||||
|
||||
|
||||
**发送方滑动窗口**
|
||||
|
||||
|
||||
|
||||
---
|
||||
|
||||
当发送方接收到`ACK`后，会将`SND.UNA`向右移动。
|
||||
|
||||
而接收方接收到数据包后，会连续的将`RCV.NXT`向右移动，当遇到丢包，就会触发重传。
|
||||
|
||||
需要注意，发送方和接收方都存在窗口大小，当发送方发送消息时，同时收到`接收方滑动窗口大小`和`自身窗口大小`的限制。
|
||||
Loading…
Reference in New Issue
Block a user