solana_streamer/nonblocking/
sendmmsg.rs

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
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
//! The `sendmmsg` module provides a nonblocking sendmmsg() API implementation

use {
    crate::sendmmsg::SendPktsError,
    futures_util::future::join_all,
    std::{borrow::Borrow, iter::repeat, net::SocketAddr},
    tokio::net::UdpSocket,
};

pub async fn batch_send<S, T>(sock: &UdpSocket, packets: &[(T, S)]) -> Result<(), SendPktsError>
where
    S: Borrow<SocketAddr>,
    T: AsRef<[u8]>,
{
    let mut num_failed = 0;
    let mut erropt = None;
    let futures = packets
        .iter()
        .map(|(p, a)| sock.send_to(p.as_ref(), a.borrow()))
        .collect::<Vec<_>>();
    let results = join_all(futures).await;
    for result in results {
        if let Err(e) = result {
            num_failed += 1;
            if erropt.is_none() {
                erropt = Some(e);
            }
        }
    }

    if let Some(err) = erropt {
        Err(SendPktsError::IoError(err, num_failed))
    } else {
        Ok(())
    }
}

pub async fn multi_target_send<S, T>(
    sock: &UdpSocket,
    packet: T,
    dests: &[S],
) -> Result<(), SendPktsError>
where
    S: Borrow<SocketAddr>,
    T: AsRef<[u8]>,
{
    let dests = dests.iter().map(Borrow::borrow);
    let pkts: Vec<_> = repeat(&packet).zip(dests).collect();
    batch_send(sock, &pkts).await
}

#[cfg(test)]
mod tests {
    use {
        crate::{
            nonblocking::{
                recvmmsg::{recv_mmsg, recv_mmsg_exact},
                sendmmsg::{batch_send, multi_target_send},
            },
            packet::Packet,
            sendmmsg::SendPktsError,
        },
        assert_matches::assert_matches,
        solana_sdk::packet::PACKET_DATA_SIZE,
        std::{
            io::ErrorKind,
            net::{IpAddr, Ipv4Addr, Ipv6Addr, SocketAddr},
        },
        tokio::net::UdpSocket,
    };

    #[tokio::test]
    async fn test_send_mmsg_one_dest() {
        let reader = UdpSocket::bind("127.0.0.1:0").await.expect("bind");
        let addr = reader.local_addr().unwrap();
        let sender = UdpSocket::bind("127.0.0.1:0").await.expect("bind");

        let packets: Vec<_> = (0..32).map(|_| vec![0u8; PACKET_DATA_SIZE]).collect();
        let packet_refs: Vec<_> = packets.iter().map(|p| (&p[..], &addr)).collect();

        let sent = batch_send(&sender, &packet_refs[..]).await.ok();
        assert_eq!(sent, Some(()));

        let mut packets = vec![Packet::default(); 32];
        let recv = recv_mmsg_exact(&reader, &mut packets[..]).await.unwrap();
        assert_eq!(32, recv);
    }

    #[tokio::test]
    async fn test_send_mmsg_multi_dest() {
        let reader = UdpSocket::bind("127.0.0.1:0").await.expect("bind");
        let addr = reader.local_addr().unwrap();

        let reader2 = UdpSocket::bind("127.0.0.1:0").await.expect("bind");
        let addr2 = reader2.local_addr().unwrap();

        let sender = UdpSocket::bind("127.0.0.1:0").await.expect("bind");

        let packets: Vec<_> = (0..32).map(|_| vec![0u8; PACKET_DATA_SIZE]).collect();
        let packet_refs: Vec<_> = packets
            .iter()
            .enumerate()
            .map(|(i, p)| {
                if i < 16 {
                    (&p[..], &addr)
                } else {
                    (&p[..], &addr2)
                }
            })
            .collect();

        let sent = batch_send(&sender, &packet_refs[..]).await.ok();
        assert_eq!(sent, Some(()));

        let mut packets = vec![Packet::default(); 16];
        let recv = recv_mmsg_exact(&reader, &mut packets[..]).await.unwrap();
        assert_eq!(16, recv);

        let mut packets = vec![Packet::default(); 16];
        let recv = recv_mmsg_exact(&reader2, &mut packets[..]).await.unwrap();
        assert_eq!(16, recv);
    }

    #[tokio::test]
    async fn test_multicast_msg() {
        let reader = UdpSocket::bind("127.0.0.1:0").await.expect("bind");
        let addr = reader.local_addr().unwrap();

        let reader2 = UdpSocket::bind("127.0.0.1:0").await.expect("bind");
        let addr2 = reader2.local_addr().unwrap();

        let reader3 = UdpSocket::bind("127.0.0.1:0").await.expect("bind");
        let addr3 = reader3.local_addr().unwrap();

        let reader4 = UdpSocket::bind("127.0.0.1:0").await.expect("bind");
        let addr4 = reader4.local_addr().unwrap();

        let sender = UdpSocket::bind("127.0.0.1:0").await.expect("bind");

        let packet = Packet::default();

        let sent = multi_target_send(
            &sender,
            packet.data(..).unwrap(),
            &[&addr, &addr2, &addr3, &addr4],
        )
        .await
        .ok();
        assert_eq!(sent, Some(()));

        let mut packets = vec![Packet::default(); 32];
        let recv = recv_mmsg(&reader, &mut packets[..]).await.unwrap();
        assert_eq!(1, recv);

        let mut packets = vec![Packet::default(); 32];
        let recv = recv_mmsg(&reader2, &mut packets[..]).await.unwrap();
        assert_eq!(1, recv);

        let mut packets = vec![Packet::default(); 32];
        let recv = recv_mmsg(&reader3, &mut packets[..]).await.unwrap();
        assert_eq!(1, recv);

        let mut packets = vec![Packet::default(); 32];
        let recv = recv_mmsg(&reader4, &mut packets[..]).await.unwrap();
        assert_eq!(1, recv);
    }

    #[tokio::test]
    async fn test_intermediate_failures_mismatched_bind() {
        let packets: Vec<_> = (0..3).map(|_| vec![0u8; PACKET_DATA_SIZE]).collect();
        let ip4 = SocketAddr::new(IpAddr::V4(Ipv4Addr::LOCALHOST), 8080);
        let ip6 = SocketAddr::new(IpAddr::V6(Ipv6Addr::LOCALHOST), 8080);
        let packet_refs: Vec<_> = vec![
            (&packets[0][..], &ip4),
            (&packets[1][..], &ip6),
            (&packets[2][..], &ip4),
        ];
        let dest_refs: Vec<_> = vec![&ip4, &ip6, &ip4];

        let sender = UdpSocket::bind("0.0.0.0:0").await.expect("bind");
        let res = batch_send(&sender, &packet_refs[..]).await;
        assert_matches!(res, Err(SendPktsError::IoError(_, /*num_failed*/ 1)));
        let res = multi_target_send(&sender, &packets[0], &dest_refs).await;
        assert_matches!(res, Err(SendPktsError::IoError(_, /*num_failed*/ 1)));
    }

    #[tokio::test]
    async fn test_intermediate_failures_unreachable_address() {
        let packets: Vec<_> = (0..5).map(|_| vec![0u8; PACKET_DATA_SIZE]).collect();
        let ipv4local = SocketAddr::new(IpAddr::V4(Ipv4Addr::LOCALHOST), 8080);
        let ipv4broadcast = SocketAddr::new(IpAddr::V4(Ipv4Addr::BROADCAST), 8080);
        let sender = UdpSocket::bind("0.0.0.0:0").await.expect("bind");

        // test intermediate failures for batch_send
        let packet_refs: Vec<_> = vec![
            (&packets[0][..], &ipv4local),
            (&packets[1][..], &ipv4broadcast),
            (&packets[2][..], &ipv4local),
            (&packets[3][..], &ipv4broadcast),
            (&packets[4][..], &ipv4local),
        ];
        match batch_send(&sender, &packet_refs[..]).await {
            Ok(()) => panic!(),
            Err(SendPktsError::IoError(ioerror, num_failed)) => {
                assert_matches!(ioerror.kind(), ErrorKind::PermissionDenied);
                assert_eq!(num_failed, 2);
            }
        }

        // test leading and trailing failures for batch_send
        let packet_refs: Vec<_> = vec![
            (&packets[0][..], &ipv4broadcast),
            (&packets[1][..], &ipv4local),
            (&packets[2][..], &ipv4broadcast),
            (&packets[3][..], &ipv4local),
            (&packets[4][..], &ipv4broadcast),
        ];
        match batch_send(&sender, &packet_refs[..]).await {
            Ok(()) => panic!(),
            Err(SendPktsError::IoError(ioerror, num_failed)) => {
                assert_matches!(ioerror.kind(), ErrorKind::PermissionDenied);
                assert_eq!(num_failed, 3);
            }
        }

        // test consecutive intermediate failures for batch_send
        let packet_refs: Vec<_> = vec![
            (&packets[0][..], &ipv4local),
            (&packets[1][..], &ipv4local),
            (&packets[2][..], &ipv4broadcast),
            (&packets[3][..], &ipv4broadcast),
            (&packets[4][..], &ipv4local),
        ];
        match batch_send(&sender, &packet_refs[..]).await {
            Ok(()) => panic!(),
            Err(SendPktsError::IoError(ioerror, num_failed)) => {
                assert_matches!(ioerror.kind(), ErrorKind::PermissionDenied);
                assert_eq!(num_failed, 2);
            }
        }

        // test intermediate failures for multi_target_send
        let dest_refs: Vec<_> = vec![
            &ipv4local,
            &ipv4broadcast,
            &ipv4local,
            &ipv4broadcast,
            &ipv4local,
        ];
        match multi_target_send(&sender, &packets[0], &dest_refs).await {
            Ok(()) => panic!(),
            Err(SendPktsError::IoError(ioerror, num_failed)) => {
                assert_matches!(ioerror.kind(), ErrorKind::PermissionDenied);
                assert_eq!(num_failed, 2);
            }
        }

        // test leading and trailing failures for multi_target_send
        let dest_refs: Vec<_> = vec![
            &ipv4broadcast,
            &ipv4local,
            &ipv4broadcast,
            &ipv4local,
            &ipv4broadcast,
        ];
        match multi_target_send(&sender, &packets[0], &dest_refs).await {
            Ok(()) => panic!(),
            Err(SendPktsError::IoError(ioerror, num_failed)) => {
                assert_matches!(ioerror.kind(), ErrorKind::PermissionDenied);
                assert_eq!(num_failed, 3);
            }
        }
    }
}