can bus buffers

[Miche]

I would like to use can bus in this manner: 2 receive buffer RXB0 and RXB1, standard IDs, RXF0 RXF1 and RXF2 RXF3.
Each filter must have different IDs so that the 2 buffers receive different types of messages.
I would like to know how I can set the instructions:

can_set_id(RX0MASK, CAN_MASK_ACCEPT_ALL, CAN_USE_EXTENDED_ID); //set mask 0
can_set_id(RXFILTER0, 0, CAN_USE_EXTENDED_ID); //set filter 0 of mask 0

I would like to know if I need to put in my software the instruction:
can_set_functional_mode(can_fun_op_legacy)
or this instruction is the same of
curfunmode=0 in can_init()

I have read Microchip ECAN datasheet looking for the registres but I can't find what RX0MASK and RXFILTER0 correspond.
Does anybody knows?

Thank You