273 static int check_optimized(struct canfd_frame *cf, int start_index)  in check_optimized()  argument
280 	if (cf->len <= CAN_MAX_DLEN)  in check_optimized()
281 		return (cf->len != start_index);  in check_optimized()
289 	return (cf->len != padlen(start_index));  in check_optimized()
293 static int check_pad(struct isotp_sock *so, struct canfd_frame *cf,  in check_pad()  argument
301 			return check_optimized(cf, start_index);  in check_pad()
309 	    cf->len != padlen(cf->len))  in check_pad()
314 		for (i = start_index; i < cf->len; i++)  in check_pad()
315 			if (cf->data[i] != content)  in check_pad()
321 static int isotp_rcv_fc(struct isotp_sock *so, struct canfd_frame *cf, int ae)  in isotp_rcv_fc()  argument
331 	if ((cf->len < ae + FC_CONTENT_SZ) ||  in isotp_rcv_fc()
333 	     check_pad(so, cf, ae + FC_CONTENT_SZ, so->opt.rxpad_content))) {  in isotp_rcv_fc()
346 		so->txfc.bs = cf->data[ae + 1];  in isotp_rcv_fc()
347 		so->txfc.stmin = cf->data[ae + 2];  in isotp_rcv_fc()
371 	switch (cf->data[ae] & 0x0F) {  in isotp_rcv_fc()
401 static int isotp_rcv_sf(struct sock *sk, struct canfd_frame *cf, int pcilen,  in isotp_rcv_sf()  argument
410 	if (!len || len > cf->len - pcilen)  in isotp_rcv_sf()
414 	    check_pad(so, cf, pcilen + len, so->opt.rxpad_content)) {  in isotp_rcv_sf()
426 	memcpy(skb_put(nskb, len), &cf->data[pcilen], len);  in isotp_rcv_sf()
434 static int isotp_rcv_ff(struct sock *sk, struct canfd_frame *cf, int ae)  in isotp_rcv_ff()  argument
445 	so->rx.ll_dl = padlen(cf->len);  in isotp_rcv_ff()
448 	if (cf->len != so->rx.ll_dl)  in isotp_rcv_ff()
452 	so->rx.len = (cf->data[ae] & 0x0F) << 8;  in isotp_rcv_ff()
453 	so->rx.len += cf->data[ae + 1];  in isotp_rcv_ff()
460 		so->rx.len = cf->data[ae + 2] << 24;  in isotp_rcv_ff()
461 		so->rx.len += cf->data[ae + 3] << 16;  in isotp_rcv_ff()
462 		so->rx.len += cf->data[ae + 4] << 8;  in isotp_rcv_ff()
463 		so->rx.len += cf->data[ae + 5];  in isotp_rcv_ff()
482 		so->rx.buf[so->rx.idx++] = cf->data[i];  in isotp_rcv_ff()
497 static int isotp_rcv_cf(struct sock *sk, struct canfd_frame *cf, int ae,  in isotp_rcv_cf()  argument
519 	if (cf->len > so->rx.ll_dl)  in isotp_rcv_cf()
523 	if (cf->len < so->rx.ll_dl) {  in isotp_rcv_cf()
529 	if ((cf->data[ae] & 0x0F) != so->rx.sn) {  in isotp_rcv_cf()
542 	for (i = ae + N_PCI_SZ; i < cf->len; i++) {  in isotp_rcv_cf()
543 		so->rx.buf[so->rx.idx++] = cf->data[i];  in isotp_rcv_cf()
553 		    check_pad(so, cf, i + 1, so->opt.rxpad_content)) {  in isotp_rcv_cf()
595 	struct canfd_frame *cf;  in isotp_rcv()  local
605 	cf = (struct canfd_frame *)skb->data;  in isotp_rcv()
608 	if (ae && cf->data[0] != so->opt.rx_ext_address)  in isotp_rcv()
611 	n_pci_type = cf->data[ae] & 0xF0;  in isotp_rcv()
623 		isotp_rcv_fc(so, cf, ae);  in isotp_rcv()
635 		sf_dl = cf->data[ae] & 0x0F;  in isotp_rcv()
637 		if (cf->len <= CAN_MAX_DLEN) {  in isotp_rcv()
638 			isotp_rcv_sf(sk, cf, SF_PCI_SZ4 + ae, skb, sf_dl);  in isotp_rcv()
650 					isotp_rcv_sf(sk, cf, SF_PCI_SZ8 + ae, skb,  in isotp_rcv()
651 						     cf->data[SF_PCI_SZ4 + ae]);  in isotp_rcv()
658 		isotp_rcv_ff(sk, cf, ae);  in isotp_rcv()
663 		isotp_rcv_cf(sk, cf, ae, skb);  in isotp_rcv()
668 static void isotp_fill_dataframe(struct canfd_frame *cf, struct isotp_sock *so,  in isotp_fill_dataframe()  argument
676 	cf->can_id = so->txid;  in isotp_fill_dataframe()
677 	cf->len = num + pcilen;  in isotp_fill_dataframe()
682 			cf->len = padlen(cf->len);  in isotp_fill_dataframe()
683 			memset(cf->data, so->opt.txpad_content, cf->len);  in isotp_fill_dataframe()
684 		} else if (cf->len > CAN_MAX_DLEN) {  in isotp_fill_dataframe()
686 			cf->len = padlen(cf->len);  in isotp_fill_dataframe()
687 			memset(cf->data, CAN_ISOTP_DEFAULT_PAD_CONTENT,  in isotp_fill_dataframe()
688 			       cf->len);  in isotp_fill_dataframe()
693 		cf->data[pcilen + i] = so->tx.buf[so->tx.idx++];  in isotp_fill_dataframe()
696 		cf->data[0] = so->opt.ext_address;  in isotp_fill_dataframe()
699 static void isotp_create_fframe(struct canfd_frame *cf, struct isotp_sock *so,  in isotp_create_fframe()  argument
705 	cf->can_id = so->txid;  in isotp_create_fframe()
706 	cf->len = so->tx.ll_dl;  in isotp_create_fframe()
708 		cf->data[0] = so->opt.ext_address;  in isotp_create_fframe()
713 		cf->data[ae] = N_PCI_FF;  in isotp_create_fframe()
714 		cf->data[ae + 1] = 0;  in isotp_create_fframe()
715 		cf->data[ae + 2] = (u8)(so->tx.len >> 24) & 0xFFU;  in isotp_create_fframe()
716 		cf->data[ae + 3] = (u8)(so->tx.len >> 16) & 0xFFU;  in isotp_create_fframe()
717 		cf->data[ae + 4] = (u8)(so->tx.len >> 8) & 0xFFU;  in isotp_create_fframe()
718 		cf->data[ae + 5] = (u8)so->tx.len & 0xFFU;  in isotp_create_fframe()
722 		cf->data[ae] = (u8)(so->tx.len >> 8) | N_PCI_FF;  in isotp_create_fframe()
723 		cf->data[ae + 1] = (u8)so->tx.len & 0xFFU;  in isotp_create_fframe()
729 		cf->data[i] = so->tx.buf[so->tx.idx++];  in isotp_create_fframe()
742 	struct canfd_frame *cf;  in isotp_tx_timer_handler()  local
782 		cf = (struct canfd_frame *)skb->data;  in isotp_tx_timer_handler()
786 		isotp_fill_dataframe(cf, so, ae, 0);  in isotp_tx_timer_handler()
789 		cf->data[ae] = N_PCI_CF | so->tx.sn++;  in isotp_tx_timer_handler()
794 			cf->flags = so->ll.tx_flags;  in isotp_tx_timer_handler()
847 	struct canfd_frame *cf;  in isotp_sendmsg()  local
891 	cf = (struct canfd_frame *)skb->data;  in isotp_sendmsg()
911 		isotp_fill_dataframe(cf, so, ae, off);  in isotp_sendmsg()
914 		cf->data[ae] = N_PCI_SF;  in isotp_sendmsg()
918 			cf->data[SF_PCI_SZ4 + ae] = size;  in isotp_sendmsg()
920 			cf->data[ae] |= size;  in isotp_sendmsg()
930 		isotp_create_fframe(cf, so, ae);  in isotp_sendmsg()
938 		cf->flags = so->ll.tx_flags;  in isotp_sendmsg()