278 static int check_optimized(struct canfd_frame *cf, int start_index)  in check_optimized()  argument
285 	if (cf->len <= CAN_MAX_DLEN)  in check_optimized()
286 		return (cf->len != start_index);  in check_optimized()
294 	return (cf->len != padlen(start_index));  in check_optimized()
298 static int check_pad(struct isotp_sock *so, struct canfd_frame *cf,  in check_pad()  argument
306 			return check_optimized(cf, start_index);  in check_pad()
314 	    cf->len != padlen(cf->len))  in check_pad()
319 		for (i = start_index; i < cf->len; i++)  in check_pad()
320 			if (cf->data[i] != content)  in check_pad()
326 static int isotp_rcv_fc(struct isotp_sock *so, struct canfd_frame *cf, int ae)  in isotp_rcv_fc()  argument
336 	if ((cf->len < ae + FC_CONTENT_SZ) ||  in isotp_rcv_fc()
338 	     check_pad(so, cf, ae + FC_CONTENT_SZ, so->opt.rxpad_content))) {  in isotp_rcv_fc()
351 		so->txfc.bs = cf->data[ae + 1];  in isotp_rcv_fc()
352 		so->txfc.stmin = cf->data[ae + 2];  in isotp_rcv_fc()
376 	switch (cf->data[ae] & 0x0F) {  in isotp_rcv_fc()
406 static int isotp_rcv_sf(struct sock *sk, struct canfd_frame *cf, int pcilen,  in isotp_rcv_sf()  argument
415 	if (!len || len > cf->len - pcilen)  in isotp_rcv_sf()
419 	    check_pad(so, cf, pcilen + len, so->opt.rxpad_content)) {  in isotp_rcv_sf()
431 	memcpy(skb_put(nskb, len), &cf->data[pcilen], len);  in isotp_rcv_sf()
439 static int isotp_rcv_ff(struct sock *sk, struct canfd_frame *cf, int ae)  in isotp_rcv_ff()  argument
450 	so->rx.ll_dl = padlen(cf->len);  in isotp_rcv_ff()
453 	if (cf->len != so->rx.ll_dl)  in isotp_rcv_ff()
457 	so->rx.len = (cf->data[ae] & 0x0F) << 8;  in isotp_rcv_ff()
458 	so->rx.len += cf->data[ae + 1];  in isotp_rcv_ff()
465 		so->rx.len = cf->data[ae + 2] << 24;  in isotp_rcv_ff()
466 		so->rx.len += cf->data[ae + 3] << 16;  in isotp_rcv_ff()
467 		so->rx.len += cf->data[ae + 4] << 8;  in isotp_rcv_ff()
468 		so->rx.len += cf->data[ae + 5];  in isotp_rcv_ff()
487 		so->rx.buf[so->rx.idx++] = cf->data[i];  in isotp_rcv_ff()
502 static int isotp_rcv_cf(struct sock *sk, struct canfd_frame *cf, int ae,  in isotp_rcv_cf()  argument
524 	if (cf->len > so->rx.ll_dl)  in isotp_rcv_cf()
528 	if (cf->len < so->rx.ll_dl) {  in isotp_rcv_cf()
534 	if ((cf->data[ae] & 0x0F) != so->rx.sn) {  in isotp_rcv_cf()
547 	for (i = ae + N_PCI_SZ; i < cf->len; i++) {  in isotp_rcv_cf()
548 		so->rx.buf[so->rx.idx++] = cf->data[i];  in isotp_rcv_cf()
558 		    check_pad(so, cf, i + 1, so->opt.rxpad_content)) {  in isotp_rcv_cf()
600 	struct canfd_frame *cf;  in isotp_rcv()  local
610 	cf = (struct canfd_frame *)skb->data;  in isotp_rcv()
613 	if (ae && cf->data[0] != so->opt.rx_ext_address)  in isotp_rcv()
616 	n_pci_type = cf->data[ae] & 0xF0;  in isotp_rcv()
628 		isotp_rcv_fc(so, cf, ae);  in isotp_rcv()
640 		sf_dl = cf->data[ae] & 0x0F;  in isotp_rcv()
642 		if (cf->len <= CAN_MAX_DLEN) {  in isotp_rcv()
643 			isotp_rcv_sf(sk, cf, SF_PCI_SZ4 + ae, skb, sf_dl);  in isotp_rcv()
655 					isotp_rcv_sf(sk, cf, SF_PCI_SZ8 + ae, skb,  in isotp_rcv()
656 						     cf->data[SF_PCI_SZ4 + ae]);  in isotp_rcv()
663 		isotp_rcv_ff(sk, cf, ae);  in isotp_rcv()
668 		isotp_rcv_cf(sk, cf, ae, skb);  in isotp_rcv()
673 static void isotp_fill_dataframe(struct canfd_frame *cf, struct isotp_sock *so,  in isotp_fill_dataframe()  argument
681 	cf->can_id = so->txid;  in isotp_fill_dataframe()
682 	cf->len = num + pcilen;  in isotp_fill_dataframe()
687 			cf->len = padlen(cf->len);  in isotp_fill_dataframe()
688 			memset(cf->data, so->opt.txpad_content, cf->len);  in isotp_fill_dataframe()
689 		} else if (cf->len > CAN_MAX_DLEN) {  in isotp_fill_dataframe()
691 			cf->len = padlen(cf->len);  in isotp_fill_dataframe()
692 			memset(cf->data, CAN_ISOTP_DEFAULT_PAD_CONTENT,  in isotp_fill_dataframe()
693 			       cf->len);  in isotp_fill_dataframe()
698 		cf->data[pcilen + i] = so->tx.buf[so->tx.idx++];  in isotp_fill_dataframe()
701 		cf->data[0] = so->opt.ext_address;  in isotp_fill_dataframe()
704 static void isotp_create_fframe(struct canfd_frame *cf, struct isotp_sock *so,  in isotp_create_fframe()  argument
710 	cf->can_id = so->txid;  in isotp_create_fframe()
711 	cf->len = so->tx.ll_dl;  in isotp_create_fframe()
713 		cf->data[0] = so->opt.ext_address;  in isotp_create_fframe()
718 		cf->data[ae] = N_PCI_FF;  in isotp_create_fframe()
719 		cf->data[ae + 1] = 0;  in isotp_create_fframe()
720 		cf->data[ae + 2] = (u8)(so->tx.len >> 24) & 0xFFU;  in isotp_create_fframe()
721 		cf->data[ae + 3] = (u8)(so->tx.len >> 16) & 0xFFU;  in isotp_create_fframe()
722 		cf->data[ae + 4] = (u8)(so->tx.len >> 8) & 0xFFU;  in isotp_create_fframe()
723 		cf->data[ae + 5] = (u8)so->tx.len & 0xFFU;  in isotp_create_fframe()
727 		cf->data[ae] = (u8)(so->tx.len >> 8) | N_PCI_FF;  in isotp_create_fframe()
728 		cf->data[ae + 1] = (u8)so->tx.len & 0xFFU;  in isotp_create_fframe()
734 		cf->data[i] = so->tx.buf[so->tx.idx++];  in isotp_create_fframe()
747 	struct canfd_frame *cf;  in isotp_tx_timer_handler()  local
787 		cf = (struct canfd_frame *)skb->data;  in isotp_tx_timer_handler()
791 		isotp_fill_dataframe(cf, so, ae, 0);  in isotp_tx_timer_handler()
794 		cf->data[ae] = N_PCI_CF | so->tx.sn++;  in isotp_tx_timer_handler()
798 		cf->flags = so->ll.tx_flags;  in isotp_tx_timer_handler()
854 	struct canfd_frame *cf;  in isotp_sendmsg()  local
916 	cf = (struct canfd_frame *)skb->data;  in isotp_sendmsg()
933 		isotp_fill_dataframe(cf, so, ae, off);  in isotp_sendmsg()
936 		cf->data[ae] = N_PCI_SF;  in isotp_sendmsg()
940 			cf->data[SF_PCI_SZ4 + ae] = size;  in isotp_sendmsg()
942 			cf->data[ae] |= size;  in isotp_sendmsg()
952 		isotp_create_fframe(cf, so, ae);  in isotp_sendmsg()
959 	cf->flags = so->ll.tx_flags;  in isotp_sendmsg()