Module description¶

Conceptually NLSR is divided into four modules

1. Core
2. Communication
3. Routing
4. Security

1. Core Module¶

• Read and parse configuration file
• Stores all configurable parameter values
• Stores Adjacent in Adjacency list
• Stores advertising names in name prefix list
• Establish connection with NDN Forwarder
• Establishing Adjacencies with neighbors
• Build LSAs
• Stores Link State Advertisement (LSA) in Link State Database (LSDB)

2. Communication Module¶

• Creates CronoSync connection
• Handles synchronization logic of NLSR's LSDB updates
• Publishes LSDB updates in router name
• Upon update notification send interest for LSAs
• Publishes certificates updates
• Send interest to fetch certificates
• Processes all inbound/outbound interest/data of NLSR

3. Routing Module¶

• Calculate routing table ( depending configuration use link - state routing calculator or Hyperbolic routing calculator)
• Stores routing table
• Creates and store Name prefix table ( Name prefix table entry is Name Prefix with nexthops list to reach that name)

4. Security Module ( This module will no longer be available later when NLSR will use NFD's rule based validator)¶

• Fetch, validate and stores certificate in Certificate Store
• If some certificate is fetched but waiting to be validated is recorded in waiting list
• After validation it is added in the certificate store otherwise discarded
• Validate each piece of data received by NLSR
• Sign data using router process keys before sending out