?? ospf_transmit_update.c
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if elapsed time bigger than retransmission interval configured for the interface, then update timestamp and accept sending LSA, else deny retransmission of this LSA */ /* Pseudocode: compute elapsed time (take care of wrap around) */ /* compute elapsed time since last transmission */ if (current_time >= last_tx_time) { elapsed_time = current_time - last_tx_time; } else { /* current_time in seconds has wrapped since last LSA transmission */ elapsed_time = 0xFFFFFFFFL + current_time - last_tx_time; } /* Pseudocode: if (elapsed time >= sptr_interface->retransmit_interval) record new timestamp of transmission to this neighbor return TRUE (accept transmitting LSA) else return FALSE (prevent transmitting LSA) */ if (elapsed_time >= sptr_interface->retransmit_interval) { OSPF_PRINTF_DEBUG (OSPF_DEBUG_PRINTF,"\n Elapsed time %ld, Interface RxmtInterval %ld ", elapsed_time, sptr_interface->retransmit_interval); /* should retransmit this LSA: elapsed time since last transmission to this neighbor is bigger than retransmit interval configured for the interface, according to this DB node */ /* accept transmitting LSA and record timestamp of this transmission */ if (sptr_lsdb_entry != NULL) { ospf_update_lsa_transmit_timestamp(sptr_lsdb_entry, sptr_lsa_timestamp, current_time, destination_router_id, sptr_neighbor, sptr_interface->ifnet_index); OSPF_PRINTF_DEBUG (OSPF_DEBUG_PRINTF, "\n LSA transmit accepted"); } return TRUE; } else /* Too early: elapsed_time < sptr_interface->retransmit_interval */ { /* must NOT retransmit this LSA: elapsed time since last transmission to this neighbor is bigger than retransmit interval configured for the interface */ OSPF_PRINTF_DEBUG (OSPF_DEBUG_PRINTF,"\n LSA transmit filtered: LSA for %08lx elapsed time %ld, crt time %ld, interface retx interval %ld for %08lx ", sptr_database_node->sptr_ls_database_entry->advertisement.sptr_router->ls_header.id, elapsed_time, current_time, last_tx_time, destination_router); return FALSE; } }/****************************************************************************************//* Function ospf_free_timestamps_for_lsdb_entry frees all timestamps of LSA transmissions for the given LSDB entry To be called before deleting any database entry Pseudocode: if LSDB entry is NULL return else for every timestamp node in the list (of LSA timestamps of the LSDB entry) dequeue the timestamp node from list free timestamp node*/void ospf_free_timestamps_for_lsdb_entry(OSPF_LS_DATABASE_ENTRY *sptr_database_entry){ OSPF_LSA_TIMESTAMP_PER_INTERFACE_LIST *sptr_retx_timestamp_node = NULL; OSPF_LSA_TIMESTAMP_PER_INTERFACE_LIST *sptr_next_retx_timestamp_node = NULL; if (sptr_database_entry == NULL) { /* param error, recover */ return; } /* before database entry is deleted, deallocate its timestamps if any */ if (sptr_database_entry->sptr_lsa_retransmit_timestamps_per_neighbor != NULL) { for ( sptr_retx_timestamp_node = sptr_database_entry->sptr_lsa_retransmit_timestamps_per_neighbor; sptr_retx_timestamp_node != NULL; sptr_retx_timestamp_node = sptr_next_retx_timestamp_node) { sptr_next_retx_timestamp_node = sptr_retx_timestamp_node->sptr_forward_link; ospf_remove_node_from_list ((OSPF_GENERIC_NODE **) &(sptr_database_entry->sptr_lsa_retransmit_timestamps_per_neighbor), (OSPF_GENERIC_NODE *) sptr_retx_timestamp_node); table_free(sptr_retx_timestamp_node); } sptr_database_entry->sptr_lsa_retransmit_timestamps_per_neighbor = NULL; }} /* ospf_free_timestamps_for_lsdb_entry *//* SPR 88619 end *//* *********************************************************************************************************************************/static enum BOOLEAN ospf_check_if_packet_is_full ( OSPF_LS_DATABASE_NODE *sptr_database_node, OSPF_INTERFACE *sptr_interface, ULONG packet_length ) { OSPF_ROUTER_LINK_ADVERTISEMENT_HEADER *sptr_router_link_advertisement_header; ULONG interface_mtu; ULONG authentication_size; USHORT length_of_advertisement; OSPF_PRINTF_DEBUG (OSPF_DEBUG_PRINTF, "OSPF: Entering ospf_check_if_packet_is_full\r\n"); interface_mtu = ospf_get_interface_mtu (sptr_interface); authentication_size = ospf_get_authentication_size (sptr_interface); sptr_router_link_advertisement_header = sptr_database_node->sptr_ls_database_entry->advertisement.sptr_router; length_of_advertisement = sptr_router_link_advertisement_header->ls_header.length; length_of_advertisement = net_to_host_short (length_of_advertisement); /* SPR 85906 -- Eegin */ if ((packet_length + length_of_advertisement + authentication_size + OSPF_MAXIMUM_IP_HEADER_SIZE) >= interface_mtu) /* SPR 85906 -- End */ { return (TRUE); } else { return (FALSE); } }/* *********************************************************************************************************************************/static UNION_OSPF_ADVERTISEMENT_HEADER *ospf_add_advertisement_to_ls_update_packet ( OSPF_LS_DATABASE_NODE *sptr_database_node, UNION_OSPF_ADVERTISEMENT_HEADER *sptr_advertisement_header, OSPF_HEADER *sptr_packet, ULONG *sptr_packet_length, enum BOOLEAN advertisement_installed ) { OSPF_ROUTER_LINK_ADVERTISEMENT_HEADER *sptr_router_link_advertisement_header; USHORT advertisement_age; USHORT length_of_advertisement;#if defined (__OPAQUE_LSA__) OSPF_TYPE_9_LINK_ADVERTISEMENT_HEADER *sptr_type_9_advertisement_header = NULL; OSPF_TYPE_10_LINK_ADVERTISEMENT_HEADER *sptr_type_10_advertisement_header = NULL; OSPF_TYPE_11_LINK_ADVERTISEMENT_HEADER *sptr_type_11_advertisement_header = NULL; OSPF_LS_OPAQUE_HEADER *opaque_lsa = NULL; USHORT opaque_lsa_size = 0x0000; USHORT opaque_ls_header_size = 0x0000; USHORT data_size = 0x0000;#endif /* __OPAQUE_LSA__ */ OSPF_PRINTF_DEBUG (OSPF_DEBUG_PRINTF, "OSPF: Entering ospf_add_advertisement_to_ls_update_packet\r\n"); sptr_router_link_advertisement_header = sptr_database_node->sptr_ls_database_entry->advertisement.sptr_router; length_of_advertisement = net_to_host_short (sptr_router_link_advertisement_header->ls_header.length);#if defined (__OPAQUE_LSA__) if ((sptr_router_link_advertisement_header->ls_header.type == OSPF_LS_TYPE_9) && (advertisement_installed == TRUE)) { opaque_ls_header_size = sizeof(OSPF_LS_OPAQUE_HEADER); sptr_type_9_advertisement_header = sptr_database_node->sptr_ls_database_entry->advertisement.sptr_type_9; data_size = sptr_type_9_advertisement_header->ls_header.length; data_size = net_to_host_short(data_size); data_size = (USHORT)(data_size - OSPF_LS_HEADER_SIZE); opaque_lsa_size = (USHORT)(data_size + opaque_ls_header_size); opaque_lsa = (OSPF_LS_OPAQUE_HEADER *) table_malloc(1, opaque_lsa_size); if (opaque_lsa != NULL) { memset(opaque_lsa, 0x00, opaque_lsa_size); memcpy(opaque_lsa, &(sptr_type_9_advertisement_header->ls_header), opaque_ls_header_size); if ((sptr_type_9_advertisement_header->data != NULL) && (data_size > 0)) { memcpy(((BYTE *)(opaque_lsa)+opaque_ls_header_size), sptr_type_9_advertisement_header->data, data_size); } memcpy ((void *) &(sptr_advertisement_header->router), (const void *)opaque_lsa, opaque_lsa_size); table_free(opaque_lsa); opaque_lsa = NULL; sptr_advertisement_header->router.ls_header.checksum = 0x0000; sptr_advertisement_header->router.ls_header.checksum = ospf_generate_LS_checksum ((void *) &(sptr_advertisement_header->router), (USHORT)opaque_lsa_size, (BYTE *) &sptr_advertisement_header->router.ls_header.checksum); } } else if ((sptr_router_link_advertisement_header->ls_header.type == OSPF_LS_TYPE_10) && (advertisement_installed == TRUE)) { opaque_ls_header_size = sizeof(OSPF_LS_OPAQUE_HEADER); sptr_type_10_advertisement_header = sptr_database_node->sptr_ls_database_entry->advertisement.sptr_type_10; data_size = sptr_type_10_advertisement_header->ls_header.length; data_size = net_to_host_short(data_size); data_size = (USHORT)(data_size - OSPF_LS_HEADER_SIZE); opaque_lsa_size = (USHORT)(data_size + opaque_ls_header_size); opaque_lsa = (OSPF_LS_OPAQUE_HEADER *) table_malloc(1, opaque_lsa_size); if (opaque_lsa != NULL) { memset(opaque_lsa, 0x00, opaque_lsa_size); memcpy(opaque_lsa, &(sptr_type_10_advertisement_header->ls_header), opaque_ls_header_size); if ((sptr_type_10_advertisement_header->data != NULL) && (data_size > 0)) { memcpy(((BYTE *)(opaque_lsa)+opaque_ls_header_size), sptr_type_10_advertisement_header->data, data_size); } memcpy ((void *) &(sptr_advertisement_header->router), (const void *)opaque_lsa, opaque_lsa_size); table_free(opaque_lsa); opaque_lsa = NULL; sptr_advertisement_header->router.ls_header.checksum = 0x0000; sptr_advertisement_header->router.ls_header.checksum = ospf_generate_LS_checksum ((void *) &(sptr_advertisement_header->router), (USHORT)opaque_lsa_size, (BYTE *) &sptr_advertisement_header->router.ls_header.checksum); } } else if ((sptr_router_link_advertisement_header->ls_header.type == OSPF_LS_TYPE_11) && (advertisement_installed == TRUE)) { opaque_ls_header_size = sizeof(OSPF_LS_OPAQUE_HEADER); sptr_type_11_advertisement_header = sptr_database_node->sptr_ls_database_entry->advertisement.sptr_type_11; data_size = sptr_type_11_advertisement_header->ls_header.length; data_size = net_to_host_short(data_size); data_size = (USHORT)(data_size - OSPF_LS_HEADER_SIZE); opaque_lsa_size = (USHORT)(data_size + opaque_ls_header_size); opaque_lsa = (OSPF_LS_OPAQUE_HEADER *) table_malloc(1, opaque_lsa_size); if (opaque_lsa != NULL) { memset(opaque_lsa, 0x00, opaque_lsa_size); memcpy(opaque_lsa, &(sptr_type_11_advertisement_header->ls_header), opaque_ls_header_size); if (data_size > 0) { memcpy(((BYTE *)(opaque_lsa)+opaque_ls_header_size), sptr_type_11_advertisement_header->data, data_size); } memcpy ((void *) &(sptr_advertisement_header->router), (const void *)opaque_lsa, opaque_lsa_size); table_free(opaque_lsa); opaque_lsa = NULL; sptr_advertisement_header->router.ls_header.checksum = 0x0000; sptr_advertisement_header->router.ls_header.checksum = ospf_generate_LS_checksum ((void *) &(sptr_advertisement_header->router), (USHORT)opaque_lsa_size, (BYTE *) &sptr_advertisement_header->router.ls_header.checksum); } } else { memcpy ((void *) &(sptr_advertisement_header->router), (const void *) sptr_router_link_advertisement_header, (size_t) length_of_advertisement); }#else /* __OPAQUE_LSA__ */ memcpy ((void *) &(sptr_advertisement_header->router), (const void *) sptr_router_link_advertisement_header, (size_t) length_of_advertisement);#endif /* __OPAQUE_LSA__ */ advertisement_age = net_to_host_short (sptr_router_link_advertisement_header->ls_header.age); advertisement_age = (USHORT) (advertisement_age + OSPF_DEFAULT_TRANSMIT_DELAY /* sptr_interface->transmit_delay */ ); sptr_advertisement_header->router.ls_header.age = (USHORT) ospf_min (advertisement_age, OSPF_MAXIMUM_AGE); sptr_advertisement_header->router.ls_header.age = host_to_net_short (sptr_advertisement_header->router.ls_header.age); sptr_advertisement_header = (UNION_OSPF_ADVERTISEMENT_HEADER *) ((ULONG) sptr_advertisement_header + length_of_advertisement); *sptr_packet_length += length_of_advertisement; ++sptr_packet->rest_of_packet.ls_update.number_of_advertisements; return (sptr_advertisement_header); }?? 快捷鍵說明
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