7  * Frame router for HSR and PRP.
25  *    Or not - resetting the counter and bridging the frame would create a
29  *    frame is received from a particular node, we know something is wrong.
93 	/* if this is a redbox supervision frame we need to verify  in is_supervision_frame()
121 					       struct hsr_frame_info *frame)  in create_stripped_skb_hsr()  argument
139 	if (frame->is_vlan)  in create_stripped_skb_hsr()
149 struct sk_buff *hsr_get_untagged_frame(struct hsr_frame_info *frame,  in hsr_get_untagged_frame()  argument
152 	if (!frame->skb_std) {  in hsr_get_untagged_frame()
153 		if (frame->skb_hsr)  in hsr_get_untagged_frame()
154 			frame->skb_std =  in hsr_get_untagged_frame()
155 				create_stripped_skb_hsr(frame->skb_hsr, frame);  in hsr_get_untagged_frame()
158 					 "Unexpected frame received in hsr_get_untagged_frame()\n");  in hsr_get_untagged_frame()
160 		if (!frame->skb_std)  in hsr_get_untagged_frame()
164 	return skb_clone(frame->skb_std, GFP_ATOMIC);  in hsr_get_untagged_frame()
167 struct sk_buff *prp_get_untagged_frame(struct hsr_frame_info *frame,  in prp_get_untagged_frame()  argument
170 	if (!frame->skb_std) {  in prp_get_untagged_frame()
171 		if (frame->skb_prp) {  in prp_get_untagged_frame()
173 			skb_trim(frame->skb_prp,  in prp_get_untagged_frame()
174 				 frame->skb_prp->len - HSR_HLEN);  in prp_get_untagged_frame()
175 			frame->skb_std =  in prp_get_untagged_frame()
176 				__pskb_copy(frame->skb_prp,  in prp_get_untagged_frame()
177 					    skb_headroom(frame->skb_prp),  in prp_get_untagged_frame()
181 			WARN_ONCE(1, "%s:%d: Unexpected frame received (port_src %s)\n",  in prp_get_untagged_frame()
187 	return skb_clone(frame->skb_std, GFP_ATOMIC);  in prp_get_untagged_frame()
207 				    struct hsr_frame_info *frame,  in prp_fill_rct()  argument
217 	if (frame->is_vlan)  in prp_fill_rct()
225 	if (frame->is_vlan)  in prp_fill_rct()
229 	trailer->sequence_nr = htons(frame->sequence_nr);  in prp_fill_rct()
250 				    struct hsr_frame_info *frame,  in hsr_fill_tag()  argument
261 	if (frame->is_vlan)  in hsr_fill_tag()
268 	hsr_ethhdr->hsr_tag.sequence_nr = htons(frame->sequence_nr);  in hsr_fill_tag()
277 /* If the original frame was an HSR tagged frame, just clone it to be sent
278  * unchanged. Otherwise, create a private frame especially tagged for 'port'.
280 struct sk_buff *hsr_create_tagged_frame(struct hsr_frame_info *frame,  in hsr_create_tagged_frame()  argument
287 	if (frame->skb_hsr) {  in hsr_create_tagged_frame()
289 			(struct hsr_ethhdr *)skb_mac_header(frame->skb_hsr);  in hsr_create_tagged_frame()
293 		return skb_clone(frame->skb_hsr, GFP_ATOMIC);  in hsr_create_tagged_frame()
295 		return skb_clone(frame->skb_std, GFP_ATOMIC);  in hsr_create_tagged_frame()
299 	skb = __pskb_copy(frame->skb_std,  in hsr_create_tagged_frame()
300 			  skb_headroom(frame->skb_std) + HSR_HLEN, GFP_ATOMIC);  in hsr_create_tagged_frame()
309 	if (frame->is_vlan)  in hsr_create_tagged_frame()
320 	return hsr_fill_tag(skb, frame, port, port->hsr->prot_version);  in hsr_create_tagged_frame()
323 struct sk_buff *prp_create_tagged_frame(struct hsr_frame_info *frame,  in prp_create_tagged_frame()  argument
328 	if (frame->skb_prp) {  in prp_create_tagged_frame()
329 		struct prp_rct *trailer = skb_get_PRP_rct(frame->skb_prp);  in prp_create_tagged_frame()
337 		return skb_clone(frame->skb_prp, GFP_ATOMIC);  in prp_create_tagged_frame()
339 		return skb_clone(frame->skb_std, GFP_ATOMIC);  in prp_create_tagged_frame()
342 	skb = skb_copy_expand(frame->skb_std, 0,  in prp_create_tagged_frame()
343 			      skb_tailroom(frame->skb_std) + HSR_HLEN,  in prp_create_tagged_frame()
345 	prp_fill_rct(skb, frame, port);  in prp_create_tagged_frame()
372 		    struct hsr_frame_info *frame)  in hsr_xmit()  argument
374 	if (frame->port_rcv->type == HSR_PT_MASTER) {  in hsr_xmit()
375 		hsr_addr_subst_dest(frame->node_src, skb, port);  in hsr_xmit()
378 		 * address of outgoing frame with that of the outgoing slave's.  in hsr_xmit()
385 bool prp_drop_frame(struct hsr_frame_info *frame, struct hsr_port *port)  in prp_drop_frame()  argument
387 	return ((frame->port_rcv->type == HSR_PT_SLAVE_A &&  in prp_drop_frame()
389 		(frame->port_rcv->type == HSR_PT_SLAVE_B &&  in prp_drop_frame()
393 bool hsr_drop_frame(struct hsr_frame_info *frame, struct hsr_port *port)  in hsr_drop_frame()  argument
396 		return prp_drop_frame(frame, port);  in hsr_drop_frame()
401 /* Forward the frame through all devices except:
403  * - If it's a HSR frame: through a device where it has passed before
404  * - if it's a PRP frame: through another PRP slave device (no bridge)
405  * - To the local HSR master only if the frame is directly addressed to it, or
406  *   a non-supervision multicast or broadcast frame.
408  * HSR slave devices should insert a HSR tag into the frame, or forward the
409  * frame unchanged if it's already tagged. Interlink devices should strip HSR
413 static void hsr_forward_do(struct hsr_frame_info *frame)  in hsr_forward_do()  argument
419 	hsr_for_each_port(frame->port_rcv->hsr, port) {  in hsr_forward_do()
421 		/* Don't send frame back the way it came */  in hsr_forward_do()
422 		if (port == frame->port_rcv)  in hsr_forward_do()
426 		if (port->type == HSR_PT_MASTER && !frame->is_local_dest)  in hsr_forward_do()
430 		if (port->type != HSR_PT_MASTER && frame->is_local_exclusive)  in hsr_forward_do()
439 		/* Don't send frame over port where it has been sent before.  in hsr_forward_do()
442 		if (!frame->is_from_san &&  in hsr_forward_do()
443 		    hsr_register_frame_out(port, frame->node_src,  in hsr_forward_do()
444 					   frame->sequence_nr))  in hsr_forward_do()
447 		if (frame->is_supervision && port->type == HSR_PT_MASTER) {  in hsr_forward_do()
448 			hsr_handle_sup_frame(frame);  in hsr_forward_do()
452 		/* Check if frame is to be dropped. Eg. for PRP no forward  in hsr_forward_do()
456 		    hsr->proto_ops->drop_frame(frame, port))  in hsr_forward_do()
460 			skb = hsr->proto_ops->create_tagged_frame(frame, port);  in hsr_forward_do()
462 			skb = hsr->proto_ops->get_untagged_frame(frame, port);  in hsr_forward_do()
465 			frame->port_rcv->dev->stats.rx_dropped++;  in hsr_forward_do()
471 			hsr_deliver_master(skb, port->dev, frame->node_src);  in hsr_forward_do()
473 			if (!hsr_xmit(skb, port, frame))  in hsr_forward_do()
480 			     struct hsr_frame_info *frame)  in check_local_dest()  argument
483 		frame->is_local_exclusive = true;  in check_local_dest()
486 		frame->is_local_exclusive = false;  in check_local_dest()
492 		frame->is_local_dest = true;  in check_local_dest()
494 		frame->is_local_dest = false;  in check_local_dest()
499 			     struct hsr_frame_info *frame)  in handle_std_frame()  argument
501 	struct hsr_port *port = frame->port_rcv;  in handle_std_frame()
505 	frame->skb_hsr = NULL;  in handle_std_frame()
506 	frame->skb_prp = NULL;  in handle_std_frame()
507 	frame->skb_std = skb;  in handle_std_frame()
510 		frame->is_from_san = true;  in handle_std_frame()
514 		frame->sequence_nr = hsr->sequence_nr;  in handle_std_frame()
521 			struct hsr_frame_info *frame)  in hsr_fill_frame_info()  argument
523 	struct hsr_port *port = frame->port_rcv;  in hsr_fill_frame_info()
533 		/* HSR tagged frame :- Data or Supervision */  in hsr_fill_frame_info()
534 		frame->skb_std = NULL;  in hsr_fill_frame_info()
535 		frame->skb_prp = NULL;  in hsr_fill_frame_info()
536 		frame->skb_hsr = skb;  in hsr_fill_frame_info()
537 		frame->sequence_nr = hsr_get_skb_sequence_nr(skb);  in hsr_fill_frame_info()
541 	/* Standard frame or PRP from master port */  in hsr_fill_frame_info()
542 	handle_std_frame(skb, frame);  in hsr_fill_frame_info()
548 			struct hsr_frame_info *frame)  in prp_fill_frame_info()  argument
550 	/* Supervision frame */  in prp_fill_frame_info()
554 	    prp_check_lsdu_size(skb, rct, frame->is_supervision)) {  in prp_fill_frame_info()
555 		frame->skb_hsr = NULL;  in prp_fill_frame_info()
556 		frame->skb_std = NULL;  in prp_fill_frame_info()
557 		frame->skb_prp = skb;  in prp_fill_frame_info()
558 		frame->sequence_nr = prp_get_skb_sequence_nr(rct);  in prp_fill_frame_info()
561 	handle_std_frame(skb, frame);  in prp_fill_frame_info()
566 static int fill_frame_info(struct hsr_frame_info *frame,  in fill_frame_info()  argument
580 	memset(frame, 0, sizeof(*frame));  in fill_frame_info()
584 	frame->is_supervision = is_supervision_frame(port->hsr, skb);  in fill_frame_info()
585 	frame->node_src = hsr_get_node(port, &hsr->node_db[hash], skb,  in fill_frame_info()
586 				       frame->is_supervision,  in fill_frame_info()
588 	if (!frame->node_src)  in fill_frame_info()
591 	frame->is_vlan = false;  in fill_frame_info()
595 		frame->is_vlan = true;  in fill_frame_info()
597 	if (frame->is_vlan) {  in fill_frame_info()
604 	frame->is_from_san = false;  in fill_frame_info()
605 	frame->port_rcv = port;  in fill_frame_info()
606 	ret = hsr->proto_ops->fill_frame_info(proto, skb, frame);  in fill_frame_info()
610 	check_local_dest(port->hsr, skb, frame);  in fill_frame_info()
618 	struct hsr_frame_info frame;  in hsr_forward_skb()  local
620 	if (fill_frame_info(&frame, skb, port) < 0)  in hsr_forward_skb()
623 	hsr_register_frame_in(frame.node_src, port, frame.sequence_nr);  in hsr_forward_skb()
624 	hsr_forward_do(&frame);  in hsr_forward_skb()
633 	kfree_skb(frame.skb_hsr);  in hsr_forward_skb()
634 	kfree_skb(frame.skb_prp);  in hsr_forward_skb()
635 	kfree_skb(frame.skb_std);  in hsr_forward_skb()