void FUN_00404a90(undefined4 param_1,undefined4 param_2,undefined4 param_3,int param_4)

{

  int iVar1;

  int iVar2;

  char *pcVar3;

  byte bVar4;

  int iVar5;

  undefined4 local_20;

  undefined4 local_1c;

  undefined4 local_18;

  undefined4 local_14;

  iVar5 = param_4 + 8;

  int_set_mld_version(param_1,1);

  FUN_00401448(7,"Received a ICMPv6 MLDv1 Reduction for %s on %s/%u\n",iVar5,param_1);

  if (((*(char *)(param_4 + 8) == -1) && (bVar4 = *(byte *)(param_4 + 9) & 0xf, bVar4 != 1)) &&

     (bVar4 != 2)) {

    iVar1 = group_find(iVar5);

    if (iVar1 == 0) {

      pcVar3 = "Couldn\'t find group %s for reduction of %s/%u\n";

    }

    else {

      iVar1 = grpint_find(*(undefined4 *)(iVar1 + 0x10),param_1);

      if (iVar1 == 0) {

        pcVar3 = "Couldn\'t find the grpint %s for reduction of %s/%u\n";

      }

      else {

        local_20 = 0;

        local_1c = 0;

        local_18 = 0;

        local_14 = 0;

        iVar2 = subscr_unsub(*(undefined4 *)(iVar1 + 4),&local_20);

        if (iVar2 != 0) {

          if (0 < *(int *)(*(int *)(iVar1 + 4) + 8)) {

            return;

          }

          FUN_00401448(7,"Querying for other listeners to %s on interface %s/%u\n",iVar5,param_1);

          FUN_004044e0(param_1,iVar5,0,0);

          *(undefined4 *)(*(int *)(iVar1 + 4) + 8) = 0xfffffffe;

          return;

        }

        pcVar3 = "Couldn\'t unsubscribe from %s on interface %s/%u\n";

      }

    }

    FUN_00401448(4,pcVar3,iVar5,param_1);

  }

  return;

}