#include <node/connection_types.h>
#include <net_permissions.h>
#include <chrono>
#include <cstdint>
#include <optional>
#include <vector>

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Classes
struct	NodeEvictionCandidate

Typedefs
typedef int64_t	NodeId

Functions
std::optional< NodeId >	SelectNodeToEvict (std::vector< NodeEvictionCandidate > &&vEvictionCandidates)
	Select an inbound peer to evict after filtering out (protecting) peers having distinct, difficult-to-forge characteristics. More...

void	ProtectEvictionCandidatesByRatio (std::vector< NodeEvictionCandidate > &vEvictionCandidates)
	Protect desirable or disadvantaged inbound peers from eviction by ratio. More...

Typedef Documentation

◆ NodeId

typedef int64_t NodeId

Definition at line 16 of file eviction.h.

Function Documentation

◆ ProtectEvictionCandidatesByRatio()

void ProtectEvictionCandidatesByRatio ( std::vector< NodeEvictionCandidate > & vEvictionCandidates )

Protect desirable or disadvantaged inbound peers from eviction by ratio.

This function protects half of the peers which have been connected the longest, to replicate the non-eviction implicit behavior and preclude attacks that start later.

Half of these protected spots (1/4 of the total) are reserved for the following categories of peers, sorted by longest uptime, even if they're not longest uptime overall:

onion peers connected via our tor control service
localhost peers, as manually configured hidden services not using -bind=addr[:port]=onion will not be detected as inbound onion connections
I2P peers
CJDNS peers

This helps protect these privacy network peers, which tend to be otherwise disadvantaged under our eviction criteria for their higher min ping times relative to IPv4/IPv6 peers, and favorise the diversity of peer connections.

Definition at line 105 of file eviction.cpp.

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◆ SelectNodeToEvict()

std::optional<NodeId> SelectNodeToEvict ( std::vector< NodeEvictionCandidate > && vEvictionCandidates )

Select an inbound peer to evict after filtering out (protecting) peers having distinct, difficult-to-forge characteristics.

The protection logic picks out fixed numbers of desirable peers per various criteria, followed by (mostly) ratios of desirable or disadvantaged peers. If any eviction candidates remain, the selection logic chooses a peer to evict.

Definition at line 178 of file eviction.cpp.