int ospf_dr_election (struct ospf_interface *oi) { struct in_addr old_dr, old_bdr; int old_state, new_state; struct list *el_list; struct ospf_neighbor *dr, *bdr; /* backup current values. */ old_dr = DR (oi); old_bdr = BDR (oi); old_state = oi->state; el_list = list_new (); /* List eligible routers. */ ospf_dr_eligible_routers (oi->nbrs, el_list); /* First election of DR and BDR. */ bdr = ospf_elect_bdr (oi, el_list); dr = ospf_elect_dr (oi, el_list); new_state = ospf_ism_state (oi); zlog_info ("DR-Election[1st]: Backup %s", inet_ntoa (BDR (oi))); zlog_info ("DR-Election[1st]: DR %s", inet_ntoa (DR (oi))); if (new_state != old_state && !(new_state == ISM_DROther && old_state < ISM_DROther)) { ospf_elect_bdr (oi, el_list); ospf_elect_dr (oi, el_list); new_state = ospf_ism_state (oi); zlog_info ("DR-Election[2nd]: Backup %s", inet_ntoa (BDR (oi))); zlog_info ("DR-Election[2nd]: DR %s", inet_ntoa (DR (oi))); } list_delete (el_list); /* if DR or BDR changes, cause AdjOK? neighbor event. */ if (!IPV4_ADDR_SAME (&old_dr, &DR (oi)) || !IPV4_ADDR_SAME (&old_bdr, &BDR (oi))) ospf_dr_change (oi->ospf, oi->nbrs); if (oi->type == OSPF_IFTYPE_BROADCAST || oi->type == OSPF_IFTYPE_POINTOPOINT) { /* Multicast group change. */ if ((old_state != ISM_DR && old_state != ISM_Backup) && (new_state == ISM_DR || new_state == ISM_Backup)) ospf_if_add_alldrouters (oi->ospf, oi->address, oi->ifp->ifindex); else if ((old_state == ISM_DR || old_state == ISM_Backup) && (new_state != ISM_DR && new_state != ISM_Backup)) ospf_if_drop_alldrouters (oi->ospf, oi->address, oi->ifp->ifindex); } return new_state; }
static int ospf_dr_election (struct ospf_interface *oi) { struct in_addr old_dr, old_bdr; int old_state, new_state; struct list *el_list; struct ospf_neighbor *dr, *bdr; /* backup current values. */ old_dr = DR (oi); old_bdr = BDR (oi); old_state = oi->state; el_list = list_new (); /* List eligible routers. */ ospf_dr_eligible_routers (oi->nbrs, el_list); /* First election of DR and BDR. */ bdr = ospf_elect_bdr (oi, el_list); dr = ospf_elect_dr (oi, el_list); new_state = ospf_ism_state (oi); zlog_info ("DR-Election[1st]: Backup %s", inet_ntoa (BDR (oi))); zlog_info ("DR-Election[1st]: DR %s", inet_ntoa (DR (oi))); if (new_state != old_state && !(new_state == ISM_DROther && old_state < ISM_DROther)) { ospf_elect_bdr (oi, el_list); ospf_elect_dr (oi, el_list); new_state = ospf_ism_state (oi); zlog_info ("DR-Election[2nd]: Backup %s", inet_ntoa (BDR (oi))); zlog_info ("DR-Election[2nd]: DR %s", inet_ntoa (DR (oi))); } list_delete (el_list); /* if DR or BDR changes, cause AdjOK? neighbor event. */ if (!IPV4_ADDR_SAME (&old_dr, &DR (oi)) || !IPV4_ADDR_SAME (&old_bdr, &BDR (oi))) ospf_dr_change (oi->ospf, oi->nbrs); return new_state; }