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

use crate::{error::LxError, net::*};
use alloc::boxed::Box;
use async_trait::async_trait;
use smoltcp::{
    socket::{RawPacketMetadata, RawSocket, RawSocketBuffer},
    wire::{IpProtocol, IpVersion, Ipv4Address, Ipv4Packet},
};

/// missing documentation
#[derive(Debug, Clone)]
pub struct RawSocketState {
    handle: GlobalSocketHandle,
    header_included: bool,
}

impl RawSocketState {
    /// missing documentation
    pub fn new(protocol: u8) -> Self {
        let rx_buffer = RawSocketBuffer::new(
            vec![RawPacketMetadata::EMPTY; RAW_METADATA_BUF],
            vec![0; RAW_RECVBUF],
        );
        let tx_buffer = RawSocketBuffer::new(
            vec![RawPacketMetadata::EMPTY; RAW_METADATA_BUF],
            vec![0; RAW_SENDBUF],
        );
        let socket = RawSocket::new(
            IpVersion::Ipv4,
            IpProtocol::from(protocol),
            rx_buffer,
            tx_buffer,
        );
        let handle = GlobalSocketHandle(get_sockets().lock().add(socket));

        RawSocketState {
            handle,
            header_included: false,
        }
    }
}

/// missing in implementation
#[async_trait]
impl Socket for RawSocketState {
    async fn read(&self, data: &mut [u8]) -> (SysResult, Endpoint) {
        info!("raw read");
        loop {
            info!("raw read loop");
            poll_ifaces();
            let net_sockets = get_sockets();
            let mut sockets = net_sockets.lock();
            let mut socket = sockets.get::<RawSocket>(self.handle.0);
            if socket.can_recv() {
                if let Ok(size) = socket.recv_slice(data) {
                    let packet = Ipv4Packet::new_unchecked(data);
                    // avoid deadlock
                    drop(socket);
                    drop(sockets);
                    poll_ifaces();
                    return (
                        Ok(size),
                        Endpoint::Ip(IpEndpoint {
                            addr: IpAddress::Ipv4(packet.src_addr()),
                            port: 0,
                        }),
                    );
                }
            } else {
                return (
                    Err(LxError::ENOTCONN),
                    Endpoint::Ip(IpEndpoint::UNSPECIFIED),
                );
            }
            drop(socket);
            drop(sockets);
        }
    }

    fn write(&self, data: &[u8], sendto_endpoint: Option<Endpoint>) -> SysResult {
        info!("raw write");
        let net_sockets = get_sockets();
        let mut sockets = net_sockets.lock();
        let mut socket = sockets.get::<RawSocket>(self.handle.0);
        if self.header_included {
            match socket.send_slice(data) {
                Ok(()) => Ok(data.len()),
                Err(_) => Err(LxError::ENOBUFS),
            }
        } else if let Some(Endpoint::Ip(endpoint)) = sendto_endpoint {
            // todo: this is a temporary solution
            let v4_src = Ipv4Address::new(192, 168, 0, 123);

            if let IpAddress::Ipv4(v4_dst) = endpoint.addr {
                let len = data.len();
                // using 20-byte IPv4 header
                let mut buffer = vec![0u8; len + 20];
                let mut packet = Ipv4Packet::new_unchecked(&mut buffer);
                packet.set_version(4);
                packet.set_header_len(20);
                packet.set_total_len((20 + len) as u16);
                packet.set_protocol(socket.ip_protocol());
                packet.set_src_addr(v4_src);
                packet.set_dst_addr(v4_dst);
                let payload = packet.payload_mut();
                payload.copy_from_slice(data);
                packet.fill_checksum();

                socket.send_slice(&buffer).unwrap();

                // avoid deadlock
                drop(socket);
                drop(sockets);
                Ok(len)
            } else {
                unimplemented!("ip type")
            }
        } else {
            Err(LxError::ENOTCONN)
        }
    }

    async fn connect(&self, _endpoint: Endpoint) -> SysResult {
        unimplemented!()
    }

    fn setsockopt(&self, _level: usize, _opt: usize, _data: &[u8]) -> SysResult {
        // match (level, opt) {
        //     (IPPROTO_IP, IP_HDRINCL) => {
        //         if let Some(arg) = data.first() {
        //             self.header_included = *arg > 0;
        //             debug!("hdrincl set to {}", self.header_included);
        //         }
        //     }
        //     _ => {}
        // }
        Ok(0)
    }
    fn get_buffer_capacity(&self) -> Option<(usize, usize)> {
        let sockets = get_sockets();
        let mut s = sockets.lock();
        let socket = s.get::<RawSocket>(self.handle.0);
        let (recv_ca, send_ca) = (
            socket.payload_recv_capacity(),
            socket.payload_send_capacity(),
        );
        Some((recv_ca, send_ca))
    }
    fn socket_type(&self) -> Option<SocketType> {
        Some(SocketType::SOCK_RAW)
    }
}