/* This is used for conditional compilation during development. */

#ifndef __OSPF_VIRTUAL_STACK__ #define __OSPF_VIRTUAL_STACK__ #endif

/* routing socket receive buffer size */ #ifndef OSPF_RAW_RCV_BUFFER #define OSPF_RAW_RCV_BUFFER (64 * 1024) #endif

ospf_constants.h文件

/************************************************************************* *

• ospf_raw_socket_create - create and initialize OSPF raw socket

*

• This routine intialize raw sockets for OSPF transmit and receive. For Interface
• with multicast capability, ospf_multicast_group_request() function must be called
• to join/leave a multicast group.

*

• RETURNS: OK on success, ERROR otherwise

*

• ERRNO: N/A

*

• NOMANUAL

*/

static STATUS ospf_raw_socket_create ()

/****************************************************************************** *

• ospf_routing_socket_create - create and initialize OSPF routing socket

*

• This routine initializes the OSPF routing socket. The routing socket is used
• to receive and send routing information from/to the routing table.

*

• RETURNS: OK on success, ERROR otherwise

*

• ERRNO: N/A

*

• NOMANUAL

*/

static STATUS ospf_routing_socket_create ()

/***************************************************************************** *

• ospf_timer_task_entry_point - ospf timer task entry point

*

• This function creates and starts the OSPF watchdog. It creates the OSPF
• timer semaphore. It then forever pends on the OSPF timer semaphore and
• calls ospf_router_timer() every time it gets the semaphore.

*

• RETURNS: ERROR is the watchdog timer could not be created or started or if
• OSPF timer semaphore could not be created.

*

• NOMANUAL

*/

/*****************************************************************************

• ospf_rtm_task_entry_point - RTM task entry point

*

• This is the start function of OSPF rtm task.
• Pseudocode:
• initialize
• synchronize with the other OSPF tasks having completed initialization
• start rtm task activities: infinite loop waiting (routing socket pended)
• to route updates received via routing socket from stack

*

• RETURNS: ERROR is not successful

*

• NOMANUAL

*/

/***************************************************************************** *

• ospf_input_task_entry_point - ospf input task entry point

*

• This is the start function of OSPF input task.
• Pseudocode:
• initialize
• synchronize with the other OSPF tasks having completed initialization
• start input task activities: infinite loop waiting (socket pended)
• to handle PDUs and interface events received via socket from router stack

*

• \NOMANUAL

*/

ospf_hello.c 用于发送、接收和处理hello报文

/***************************************************************************************

• ospf_vx_ip_receive_socket_input - OSPF packet received routine

*

• This is the entry point for "tOspfInput" task that is created in ospf_intialize_router()
• (see ospf_initialization.c file). It waits for packet on the raw socket using the
• select() call. Once select() returns, it calls recvfrom() to read the data from
• the socket and the ospf_router_rx_packet() to process the received packet.
• Unlike the tranditional receive routine that processes mbuf, it is not necssary to
• enqueue the received packet to a linked list and have a separate task to do the actual
• packet processing functionality. This is because the "tOspfInput" task always pend on a
• set of sockets waiting for data and this task is receiving data independent of the
• "tNetTask".

*/

ospf_hello.c文件

This file is used from the timer task to send hello packets and on the receive task when receiving hello packets.