The DHCP Client Manager is a component of the RDK-B (Reference Design Kit for Broadband) framework that provides centralized management of DHCP operations for both IPv4 and IPv6 protocols. This implementation ensures efficient IP address management, seamless IPv4\/IPv6 coexistence, and dynamic lease monitoring in RDK-B networking environments.<\/p>\n\n\n\n
Architecture Overview<\/p>\n\n\n\n
The DHCP Client Manager follows a modular, event-driven architecture with the following main components:<\/p>\n\n\n\n
\u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510 \u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510 \u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510\n\u2502 Rbus Thread \u2502 \u2502 Main Controller \u2502 \u2502 Lease Monitor \u2502\n\u2502 \u2502 \u2502 \u2502 \u2502 \u2502\n\u2502 \u2022 TR-181 DML \u2502\u25c4\u2500\u2500\u25ba\u2502 \u2022 Client Control\u2502\u25c4\u2500\u2500\u25ba\u2502 \u2022 IPC Listener \u2502\n\u2502 \u2022 Set\/Get Ops \u2502 \u2502 \u2022 Status Monitor\u2502 \u2502 \u2022 Lease Updates \u2502\n\u2502 \u2022 Subscriptions \u2502 \u2502 \u2022 Interface Mgmt\u2502 \u2502 \u2502\n\u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518 \u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518 \u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518\n \u2502 \u2502 \u2502\n \u2502 \u2502 \u2502\n \u25bc \u25bc \u25bc\n\u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510 \u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510 \u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510\n\u2502 Recovery Handler\u2502 \u2502 Lease Handlers \u2502 \u2502 Client Plugins \u2502\n\u2502 \u2502 \u2502 \u2502 \u2502 \u2502\n\u2502 \u2022 Persistence \u2502 \u2502 \u2022 DHCPv4 Process\u2502 \u2502 \u2022 udhcpc Plugin \u2502\n\u2502 \u2022 State Restore \u2502 \u2502 \u2022 DHCPv6 Process\u2502 \u2502 \u2022 dibbler Plugin\u2502\n\u2502 \u2022 Crash Recovery\u2502 \u2502 \u2022 Event Updates \u2502 \u2502 \u2502\n\u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518 \u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518 \u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518\n<\/pre>\n\n\n\nDirectory Structure<\/p>\n\n\n\n
docs\/\n\u251c\u2500\u2500 README.md # This overview document\n\u251c\u2500\u2500 configuration-guide.md # Comprehensive PSM configuration guide\n\u251c\u2500\u2500 architecture\/\n\u2502 \u2514\u2500\u2500 component-diagram.md # Detailed component relationships and diagrams\n\u2514\u2500\u2500 components\/\n \u251c\u2500\u2500 lease-monitor.md # Lease monitoring system\n \u251c\u2500\u2500 main-controller.md # Main controller logic\n \u251c\u2500\u2500 lease-handlers.md # DHCPv4\/v6 lease processing\n \u251c\u2500\u2500 recovery-handler.md # Persistence and recovery\n \u2514\u2500\u2500 mapt-apis.md # MAP-T implementation\n<\/pre>\n\n\n\nDocumentation Links<\/p>\n\n\n\n
Configuration & Setup<\/h3>\n\n\n\n
\n
- Configuration Guide<\/a><\/strong> – Complete PSM parameter configuration with examples<\/li>\n<\/ul>\n\n\n\n
Architecture Documentation<\/strong><\/p>\n\n\n\n
\n
- Component Diagram<\/a><\/strong>\u00a0– System architecture and component relationships<\/li>\n<\/ul>\n\n\n\n
Component Documentation<\/h3>\n\n\n\n
\n
- Lease Monitor<\/a><\/strong>\u00a0– IPC-based lease monitoring system<\/li>\n\n\n\n
- Main Controller<\/a><\/strong>\u00a0– Central coordination and client management<\/li>\n\n\n\n
- Lease Handlers<\/a><\/strong>\u00a0– DHCPv4\/v6 lease processing logic<\/li>\n\n\n\n
- Recovery Handler<\/a><\/strong>\u00a0– Persistence and crash recovery<\/li>\n\n\n\n
- MAP-T APIs<\/a><\/strong>\u00a0– IPv4-over-IPv6 transition support<\/li>\n<\/ul>\n\n\n\n
Quick Start<\/h3>\n\n\n\n
Building the Component<\/h3>\n\n\n\n
The DHCP Client Manager is built as part of the RDK-B build system:<\/p>\n\n\n\n
# Build the entire DHCP Manager\nbitbake ccsp-dhcp-mgr\n\n<\/pre>\n\n\n\nConfiguration<\/h3>\n\n\n\n
The component is configured through TR-181 Data Model entries:<\/p>\n\n\n\n
\n
Device.DHCPv4.Client.{i}.*<\/code> – DHCPv4 client configuration<\/li>\n\n\n\nDevice.DHCPv6.Client.{i}.*<\/code> – DHCPv6 client configuration<\/li>\n<\/ul>\n\n\n\nKey Interfaces<\/strong><\/p>\n\n\n\n
\n
- IPC Address<\/strong>:
tcp:\/\/127.0.0.1:50324<\/code> (for lease monitoring)<\/li>\n\n\n\n- Configuration Files<\/strong>: Dynamic creation based on TR-181 settings<\/li>\n\n\n\n
- Log Output<\/strong>: Standard RDK logging framework<\/li>\n<\/ul>\n\n\n\n
Configuration<\/p>\n\n\n\n
The DHCP Client Manager is configured through PSM (Persistent Storage Manager) parameters and TR-181 Data Model entries. Configuration covers both DHCPv4 and DHCPv6 clients with support for custom options, vendor-specific information, and WAN Manager integration.<\/p>\n\n\n\n
Configuration Structure<\/strong><\/p>\n\n\n\n
dmsb.dhcpmanager\n\u251c\u2500\u2500 ClientNoOfEntries # Number of DHCPv4 clients\n\u251c\u2500\u2500 Client.{i} # DHCPv4 client instances\n\u2502 \u251c\u2500\u2500 Alias # Client alias\/name\n\u2502 \u251c\u2500\u2500 ReqOptionNoOfEntries # Number of requested options\n\u2502 \u251c\u2500\u2500 ReqOption.{i}.Tag # DHCP option tag\n\u2502 \u251c\u2500\u2500 SendOptionNoOfEntries # Number of sent options\n\u2502 \u251c\u2500\u2500 SendOption.{i}.Tag # DHCP option tag\n\u2502 \u2514\u2500\u2500 SendOption.{i}.Value # Option value (hex-encoded)\n\u2514\u2500\u2500 dhcpv6\n \u251c\u2500\u2500 ClientNoOfEntries # Number of DHCPv6 clients\n \u2514\u2500\u2500 Client.{i} # DHCPv6 client instances\n \u251c\u2500\u2500 Alias # Client alias\/name\n \u251c\u2500\u2500 ReqAddr # Request IPv6 address (IANA)\n \u251c\u2500\u2500 ReqPrefix # Request prefix delegation (IAPD)\n \u251c\u2500\u2500 RequestedOptions # Comma-separated option list\n \u251c\u2500\u2500 SentOptNoOfEntries # Number of sent options\n \u251c\u2500\u2500 SentOption.{i}.Tag # DHCPv6 option tag\n \u2514\u2500\u2500 SentOption.{i}.Value # Option value (hex-encoded)\n<\/pre>\n\n\n\nCore Components<\/h2>\n\n\n\n
1. Main Controller<\/strong> (
dhcpmgr_controller.c\/h<\/code>)<\/p>\n\n\n\n\n
- Manages DHCP client lifecycle<\/li>\n\n\n\n
- Monitors interface status changes<\/li>\n\n\n\n
- Coordinates lease processing<\/li>\n\n\n\n
- Handles client startup\/shutdown<\/li>\n\n\n\n
- Monitors client process health<\/li>\n<\/ul>\n\n\n\n
2. Lease Monitor<\/strong> (
dhcp_lease_monitor_thrd.c\/h<\/code>)<\/p>\n\n\n\n\n
- IPC server for receiving lease updates<\/li>\n\n\n\n
- Processes messages from DHCP client plugins<\/li>\n\n\n\n
- Routes lease information to appropriate handlers<\/li>\n<\/ul>\n\n\n\n
3. Lease Handlers<\/strong> (
dhcpmgr_v*_lease_handler.c<\/code>)<\/p>\n\n\n\n\n
- DHCPv4 Handler<\/strong>: Processes IPv4 lease information<\/li>\n\n\n\n
- DHCPv6 Handler<\/strong>: Processes IPv6 lease information (IANA\/IAPD)<\/li>\n\n\n\n
- Updates TR-181 data model<\/li>\n\n\n\n
- Configures network interfaces<\/li>\n<\/ul>\n\n\n\n
4. Recovery Handler<\/strong> (
dhcpmgr_recovery_handler.c\/h<\/code>)<\/p>\n\n\n\n\n
- Persists lease information to filesystem (\/tmp\/)<\/li>\n\n\n\n
- Restores state after process restart<\/li>\n<\/ul>\n\n\n\n
5. MAP-T Support<\/strong> (
dhcpmgr_map_apis.c\/h<\/code>)<\/p>\n\n\n\n\n
- Implements RFC 7599 for IPv4-over-IPv6<\/li>\n\n\n\n
- Processes DHCP option 95 for MAP-T configuration<\/li>\n\n\n\n
- Validates MAP-T parameters<\/li>\n<\/ul>\n\n\n\n
Client Plugin Architecture<\/h2>\n\n\n\n
The DHCP Manager works with external DHCP clients through a plugin architecture:<\/p>\n\n\n\n
DHCPv4 (udhcpc)<\/p>\n\n\n\n
\n
- Config Creator<\/strong>: Generates udhcpc-compatible configuration<\/li>\n\n\n\n
- Plugin Binary<\/strong>:
dhcpmgr_udhcpc_plugin<\/code> – executed on lease events by the dhcp client<\/li>\n\n\n\n- Communication<\/strong>: IPC socket to lease monitor<\/li>\n<\/ul>\n\n\n\n
DHCPv6 (dibbler)<\/p>\n\n\n\n
\n
- Config Creator<\/strong>: Generates dibbler-compatible configuration<\/li>\n\n\n\n
- Plugin Binary<\/strong>:
dhcpmgr_dibbler_plugin<\/code> – executed on lease events by the dhcp client<\/li>\n\n\n\n- Communication<\/strong>: IPC socket to lease monitor<\/li>\n<\/ul>\n\n\n\n
Message Flow<\/h2>\n\n\n\n
\n
- Initialization<\/strong>: Main controller starts and initializes all components<\/li>\n\n\n\n
- Client Start<\/strong>: TR-181 configuration triggers DHCP client startup<\/li>\n\n\n\n
- Lease Acquisition<\/strong>: External DHCP client acquires lease<\/li>\n\n\n\n
- Plugin Execution<\/strong>: Client executes plugin with lease information<\/li>\n\n\n\n
- IPC Communication<\/strong>: Plugin sends lease data to lease monitor<\/li>\n\n\n\n
- Processing<\/strong>: Lease handlers process and validate lease information<\/li>\n\n\n\n
- TR-181 Update<\/strong>: Data model is updated with new lease information<\/li>\n\n\n\n
- Persistence<\/strong>: Lease information is stored for recovery<\/li>\n\n\n\n
- Event Notification<\/strong>: System events are generated for other components<\/li>\n<\/ol>\n\n\n\n
Integration Points<\/h2>\n\n\n\n
\n
- TR-181 Data Model<\/strong>: Primary configuration and status interface<\/li>\n\n\n\n
- WAN Manager<\/strong>: Lease status notifications<\/li>\n\n\n\n
- System Events<\/strong>: Network configuration updates<\/li>\n\n\n\n
- RBUS\/DBUS<\/strong>: Management interface for external components<\/li>\n<\/ul>\n\n\n\n
Error Handling and Recovery
<\/h2>\n\n\n\n\n
- Process Monitoring<\/strong>: Tracks DHCP client process health<\/li>\n\n\n\n
- Automatic Restart<\/strong>: Restarts failed DHCP clients<\/li>\n\n\n\n
- Lease Persistence<\/strong>: Maintains lease information across restarts<\/li>\n\n\n\n
- State Recovery<\/strong>: Restores full system state after crashes<\/li>\n<\/ul>\n\n\n\n
Performance Considerations<\/h2>\n\n\n\n
\n
- Asynchronous Processing<\/strong>: Non-blocking lease processing<\/li>\n\n\n\n
- Memory Management<\/strong>: Efficient cleanup of lease structures<\/li>\n\n\n\n
- IPC Optimization<\/strong>: Fast message processing in lease monitor<\/li>\n\n\n\n
- Thread Safety<\/strong>: Proper synchronization across components<\/li>\n<\/ul>\n\n\n\n
Troubleshooting<\/h2>\n\n\n\n
Common issues and debugging approaches are documented in each component’s specific documentation. Key areas to check:<\/p>\n\n\n\n
\n
- IPC Communication<\/strong>: Verify lease monitor is listening<\/li>\n\n\n\n
- Plugin Execution<\/strong>: Check plugin binary permissions and paths<\/li>\n\n\n\n
- Configuration<\/strong>: Validate TR-181 settings<\/li>\n\n\n\n
- Logs<\/strong>: Review component logs for error messages<\/li>\n\n\n\n
- Process Status<\/strong>: Verify DHCP client processes are running<\/li>\n<\/ol>\n\n\n\n
Contributing<\/p>\n\n\n\n
When modifying the DHCP Client Manager:<\/p>\n\n\n\n
\n
- Follow existing code patterns and style<\/li>\n\n\n\n
- Update relevant documentation<\/li>\n\n\n\n
- Test with both IPv4 and IPv6 scenarios<\/li>\n\n\n\n
- Verify TR-181 compliance<\/li>\n\n\n\n
- Test recovery scenarios<\/li>\n<\/ol>\n\n\n\n
References<\/p>\n\n\n\n
\n
- TR-181 Data Model<\/a><\/li>\n\n\n\n
- RFC 2131 – DHCP<\/a><\/li>\n\n\n\n
- RFC 3315 – DHCPv6<\/a><\/li>\n\n\n\n
- RFC 7599 – MAP-T<\/a><\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"
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