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Rewrite our 2G downgrade analyzer

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This commit is contained in:
Will Greenberg
2025-01-17 12:33:14 -08:00
committed by Cooper Quintin
parent 26eda5904f
commit 12640cc878
4 changed files with 33 additions and 65 deletions
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86
lib/src/analysis/lte_downgrade.rs
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@@ -2,80 +2,40 @@ use std::borrow::Cow;
use super::analyzer::{Analyzer, Event, EventType, Severity};
use super::information_element::{InformationElement, LteInformationElement};
use telcom_parser::lte_rrc::{BCCH_DL_SCH_MessageType, BCCH_DL_SCH_MessageType_c1, CellReselectionPriority, SystemInformationBlockType7, SystemInformationCriticalExtensions, SystemInformation_r8_IEsSib_TypeAndInfo, SystemInformation_r8_IEsSib_TypeAndInfo_Entry};
use telcom_parser::lte_rrc::{DL_DCCH_Message, DL_DCCH_MessageType, DL_DCCH_MessageType_c1, RRCConnectionReleaseCriticalExtensions, RRCConnectionReleaseCriticalExtensions_c1, RedirectedCarrierInfo};
use super::util::unpack;
/// Based on heuristic T7 from Shinjo Park's "Why We Cannot Win".
pub struct LteSib6And7DowngradeAnalyzer {
}
impl LteSib6And7DowngradeAnalyzer {
fn unpack_system_information<'a>(&self, ie: &'a InformationElement) -> Option<&'a SystemInformation_r8_IEsSib_TypeAndInfo> {
if let InformationElement::LTE(LteInformationElement::BcchDlSch(bcch_dl_sch_message)) = ie {
if let BCCH_DL_SCH_MessageType::C1(BCCH_DL_SCH_MessageType_c1::SystemInformation(system_information)) = &bcch_dl_sch_message.message {
if let SystemInformationCriticalExtensions::SystemInformation_r8(sib) = &system_information.critical_extensions {
return Some(&sib.sib_type_and_info);
}
}
}
None
}
pub struct ConnectionRedirect2GDowngradeAnalyzer {
}
// TODO: keep track of SIB state to compare LTE reselection blocks w/ 2g/3g ones
impl Analyzer for LteSib6And7DowngradeAnalyzer {
impl Analyzer for ConnectionRedirect2GDowngradeAnalyzer {
fn get_name(&self) -> Cow<str> {
Cow::from("LTE SIB 6/7 Downgrade")
Cow::from("Connection Release/Redirected Carrier 2G Downgrade")
}
fn get_description(&self) -> Cow<str> {
Cow::from("Tests for LTE cells broadcasting a SIB type 6 and 7 which include 2G/3G frequencies with higher priorities.")
Cow::from("Tests if a cell releases our connection and redirects us to a 2G cell.")
}
fn analyze_information_element(&mut self, ie: &InformationElement) -> Option<super::analyzer::Event> {
let sibs = &self.unpack_system_information(ie)?.0;
for sib in sibs {
match sib {
SystemInformation_r8_IEsSib_TypeAndInfo_Entry::Sib6(sib6) => {
if let Some(carrier_info_list) = sib6.carrier_freq_list_utra_fdd.as_ref() {
for carrier_info in &carrier_info_list.0 {
if let Some(CellReselectionPriority(p)) = carrier_info.cell_reselection_priority {
if p == 0 {
return Some(Event {
event_type: EventType::QualitativeWarning { severity: Severity::High },
message: "LTE cell advertised a 3G cell for priority 0 reselection".to_string(),
});
}
}
}
}
if let Some(carrier_info_list) = sib6.carrier_freq_list_utra_tdd.as_ref() {
for carrier_info in &carrier_info_list.0 {
if let Some(CellReselectionPriority(p)) = carrier_info.cell_reselection_priority {
if p == 0 {
return Some(Event {
event_type: EventType::QualitativeWarning { severity: Severity::High },
message: "LTE cell advertised a 3G cell for priority 0 reselection".to_string(),
});
}
}
}
}
},
SystemInformation_r8_IEsSib_TypeAndInfo_Entry::Sib7(SystemInformationBlockType7 { carrier_freqs_info_list: Some(carrier_info_list), .. }) => {
for carrier_info in &carrier_info_list.0 {
if let Some(CellReselectionPriority(p)) = carrier_info.common_info.cell_reselection_priority {
if p == 0 {
return Some(Event {
event_type: EventType::QualitativeWarning { severity: Severity::High },
message: "LTE cell advertised a 2G cell for priority 0 reselection".to_string(),
});
}
}
}
},
_ => {},
}
fn analyze_information_element(&mut self, ie: &InformationElement) -> Option<Event> {
unpack!(InformationElement::LTE(lte_ie) = ie);
unpack!(LteInformationElement::DlDcch(DL_DCCH_Message { message }) = lte_ie);
unpack!(DL_DCCH_MessageType::C1(c1) = message);
unpack!(DL_DCCH_MessageType_c1::RrcConnectionRelease(release) = c1);
unpack!(RRCConnectionReleaseCriticalExtensions::C1(c1) = &release.critical_extensions);
unpack!(RRCConnectionReleaseCriticalExtensions_c1::RrcConnectionRelease_r8(r8_ies) = c1);
unpack!(Some(carrier_info) = &r8_ies.redirected_carrier_info);
match carrier_info {
RedirectedCarrierInfo::Geran(_carrier_freqs_geran) => Some(Event {
event_type: EventType::QualitativeWarning { severity: Severity::High },
message: format!("Detected 2G downgrade"),
}),
_ => Some(Event {
event_type: EventType::Informational,
message: format!("RRCConnectionRelease CarrierInfo: {:?}", carrier_info),
}),
}
None
}
}