rs-pfcp 0.4.0

High-performance Rust implementation of PFCP (Packet Forwarding Control Protocol) for 5G networks with 100% 3GPP TS 29.244 Release 18 compliance
Documentation 
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

//! DSCP to PPI Control Information Information Element.
//!
//! Per 3GPP TS 29.244 Section 7.5.2.1-6, groups one or more DSCP-to-PPI
//! mapping information entries with optional QFI associations.

use crate::error::PfcpError;
use crate::ie::dscp_to_ppi_mapping_information::DscpToPpiMappingInformation;
use crate::ie::qfi::Qfi;
use crate::ie::{marshal_ies, Ie, IeIterator, IeType};

/// DSCP to PPI Control Information per 3GPP TS 29.244 ยง7.5.2.1-6.
#[derive(Debug, Clone, PartialEq, Eq)]
pub struct DscpToPpiControlInformation {
    /// DSCP-to-PPI mapping entries (mandatory, at least one).
    pub dscp_to_ppi_mapping_informations: Vec<DscpToPpiMappingInformation>,
    /// Associated QFIs (optional, zero or more).
    pub qfis: Vec<Qfi>,
}

impl DscpToPpiControlInformation {
    pub fn new(dscp_to_ppi_mapping_informations: Vec<DscpToPpiMappingInformation>) -> Self {
        DscpToPpiControlInformation {
            dscp_to_ppi_mapping_informations,
            qfis: Vec::new(),
        }
    }

    pub fn marshal(&self) -> Vec<u8> {
        let mut ies: Vec<Ie> = self
            .dscp_to_ppi_mapping_informations
            .iter()
            .map(|m| m.to_ie())
            .collect();
        for qfi in &self.qfis {
            ies.push(qfi.to_ie());
        }
        marshal_ies(&ies)
    }

    pub fn unmarshal(payload: &[u8]) -> Result<Self, PfcpError> {
        let mut dscp_to_ppi_mapping_informations = Vec::new();
        let mut qfis = Vec::new();

        for ie_result in IeIterator::new(payload) {
            let ie = ie_result?;
            match ie.ie_type {
                IeType::DscpToPpiMappingInformation => {
                    dscp_to_ppi_mapping_informations
                        .push(DscpToPpiMappingInformation::unmarshal(&ie.payload)?);
                }
                IeType::Qfi => {
                    qfis.push(Qfi::unmarshal(&ie.payload)?);
                }
                _ => (),
            }
        }

        if dscp_to_ppi_mapping_informations.is_empty() {
            return Err(PfcpError::missing_ie_in_grouped(
                IeType::DscpToPpiMappingInformation,
                IeType::DscpToPpiControlInformation,
            ));
        }

        Ok(DscpToPpiControlInformation {
            dscp_to_ppi_mapping_informations,
            qfis,
        })
    }

    pub fn to_ie(&self) -> Ie {
        Ie::new(IeType::DscpToPpiControlInformation, self.marshal())
    }
}

#[cfg(test)]
mod tests {
    use super::*;

    fn make_mapping() -> DscpToPpiMappingInformation {
        DscpToPpiMappingInformation {
            ppi: 3,
            dscp_values: vec![0x10, 0x18],
        }
    }

    #[test]
    fn test_marshal_unmarshal_mapping_only() {
        let ie = DscpToPpiControlInformation::new(vec![make_mapping()]);
        let parsed = DscpToPpiControlInformation::unmarshal(&ie.marshal()).unwrap();
        assert_eq!(parsed, ie);
    }

    #[test]
    fn test_marshal_unmarshal_with_qfis() {
        let mut ie = DscpToPpiControlInformation::new(vec![make_mapping()]);
        ie.qfis = vec![Qfi::new(1).unwrap(), Qfi::new(2).unwrap()];
        let parsed = DscpToPpiControlInformation::unmarshal(&ie.marshal()).unwrap();
        assert_eq!(parsed, ie);
    }

    #[test]
    fn test_marshal_unmarshal_multiple_mappings() {
        let ie = DscpToPpiControlInformation::new(vec![make_mapping(), make_mapping()]);
        let parsed = DscpToPpiControlInformation::unmarshal(&ie.marshal()).unwrap();
        assert_eq!(parsed, ie);
    }

    #[test]
    fn test_missing_mapping_fails() {
        assert!(matches!(
            DscpToPpiControlInformation::unmarshal(&[]),
            Err(PfcpError::MissingMandatoryIe { .. })
        ));
    }

    #[test]
    fn test_to_ie() {
        let ie = DscpToPpiControlInformation::new(vec![make_mapping()]).to_ie();
        assert_eq!(ie.ie_type, IeType::DscpToPpiControlInformation);
        assert!(!ie.payload.is_empty());
    }
}