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.
79 					       struct hsr_frame_info *frame)  in create_stripped_skb_hsr()  argument
97 	if (frame->is_vlan)  in create_stripped_skb_hsr()
107 struct sk_buff *hsr_get_untagged_frame(struct hsr_frame_info *frame,  in hsr_get_untagged_frame()  argument
110 	if (!frame->skb_std) {  in hsr_get_untagged_frame()
111 		if (frame->skb_hsr) {  in hsr_get_untagged_frame()
112 			frame->skb_std =  in hsr_get_untagged_frame()
113 				create_stripped_skb_hsr(frame->skb_hsr, frame);  in hsr_get_untagged_frame()
116 			WARN_ONCE(1, "%s:%d: Unexpected frame received (port_src %s)\n",  in hsr_get_untagged_frame()
122 	return skb_clone(frame->skb_std, GFP_ATOMIC);  in hsr_get_untagged_frame()
125 struct sk_buff *prp_get_untagged_frame(struct hsr_frame_info *frame,  in prp_get_untagged_frame()  argument
128 	if (!frame->skb_std) {  in prp_get_untagged_frame()
129 		if (frame->skb_prp) {  in prp_get_untagged_frame()
131 			skb_trim(frame->skb_prp,  in prp_get_untagged_frame()
132 				 frame->skb_prp->len - HSR_HLEN);  in prp_get_untagged_frame()
133 			frame->skb_std =  in prp_get_untagged_frame()
134 				__pskb_copy(frame->skb_prp,  in prp_get_untagged_frame()
135 					    skb_headroom(frame->skb_prp),  in prp_get_untagged_frame()
139 			WARN_ONCE(1, "%s:%d: Unexpected frame received (port_src %s)\n",  in prp_get_untagged_frame()
145 	return skb_clone(frame->skb_std, GFP_ATOMIC);  in prp_get_untagged_frame()
165 				    struct hsr_frame_info *frame,  in prp_fill_rct()  argument
175 	if (frame->is_vlan)  in prp_fill_rct()
183 	if (frame->is_vlan)  in prp_fill_rct()
187 	trailer->sequence_nr = htons(frame->sequence_nr);  in prp_fill_rct()
208 				    struct hsr_frame_info *frame,  in hsr_fill_tag()  argument
219 	if (frame->is_vlan)  in hsr_fill_tag()
226 	hsr_ethhdr->hsr_tag.sequence_nr = htons(frame->sequence_nr);  in hsr_fill_tag()
235 /* If the original frame was an HSR tagged frame, just clone it to be sent
236  * unchanged. Otherwise, create a private frame especially tagged for 'port'.
238 struct sk_buff *hsr_create_tagged_frame(struct hsr_frame_info *frame,  in hsr_create_tagged_frame()  argument
245 	if (frame->skb_hsr) {  in hsr_create_tagged_frame()
247 			(struct hsr_ethhdr *)skb_mac_header(frame->skb_hsr);  in hsr_create_tagged_frame()
251 		return skb_clone(frame->skb_hsr, GFP_ATOMIC);  in hsr_create_tagged_frame()
253 		return skb_clone(frame->skb_std, GFP_ATOMIC);  in hsr_create_tagged_frame()
257 	skb = __pskb_copy(frame->skb_std,  in hsr_create_tagged_frame()
258 			  skb_headroom(frame->skb_std) + HSR_HLEN, GFP_ATOMIC);  in hsr_create_tagged_frame()
267 	if (frame->is_vlan)  in hsr_create_tagged_frame()
278 	return hsr_fill_tag(skb, frame, port, port->hsr->prot_version);  in hsr_create_tagged_frame()
281 struct sk_buff *prp_create_tagged_frame(struct hsr_frame_info *frame,  in prp_create_tagged_frame()  argument
286 	if (frame->skb_prp) {  in prp_create_tagged_frame()
287 		struct prp_rct *trailer = skb_get_PRP_rct(frame->skb_prp);  in prp_create_tagged_frame()
295 		return skb_clone(frame->skb_prp, GFP_ATOMIC);  in prp_create_tagged_frame()
297 		return skb_clone(frame->skb_std, GFP_ATOMIC);  in prp_create_tagged_frame()
300 	skb = skb_copy_expand(frame->skb_std, 0,  in prp_create_tagged_frame()
301 			      skb_tailroom(frame->skb_std) + HSR_HLEN,  in prp_create_tagged_frame()
303 	prp_fill_rct(skb, frame, port);  in prp_create_tagged_frame()
329 		    struct hsr_frame_info *frame)  in hsr_xmit()  argument
331 	if (frame->port_rcv->type == HSR_PT_MASTER) {  in hsr_xmit()
332 		hsr_addr_subst_dest(frame->node_src, skb, port);  in hsr_xmit()
335 		 * address of outgoing frame with that of the outgoing slave's.  in hsr_xmit()
342 bool prp_drop_frame(struct hsr_frame_info *frame, struct hsr_port *port)  in prp_drop_frame()  argument
344 	return ((frame->port_rcv->type == HSR_PT_SLAVE_A &&  in prp_drop_frame()
346 		(frame->port_rcv->type == HSR_PT_SLAVE_B &&  in prp_drop_frame()
350 bool hsr_drop_frame(struct hsr_frame_info *frame, struct hsr_port *port)  in hsr_drop_frame()  argument
353 		return prp_drop_frame(frame, port);  in hsr_drop_frame()
358 /* Forward the frame through all devices except:
360  * - If it's a HSR frame: through a device where it has passed before
361  * - if it's a PRP frame: through another PRP slave device (no bridge)
362  * - To the local HSR master only if the frame is directly addressed to it, or
363  *   a non-supervision multicast or broadcast frame.
365  * HSR slave devices should insert a HSR tag into the frame, or forward the
366  * frame unchanged if it's already tagged. Interlink devices should strip HSR
370 static void hsr_forward_do(struct hsr_frame_info *frame)  in hsr_forward_do()  argument
376 	hsr_for_each_port(frame->port_rcv->hsr, port) {  in hsr_forward_do()
378 		/* Don't send frame back the way it came */  in hsr_forward_do()
379 		if (port == frame->port_rcv)  in hsr_forward_do()
383 		if (port->type == HSR_PT_MASTER && !frame->is_local_dest)  in hsr_forward_do()
387 		if (port->type != HSR_PT_MASTER && frame->is_local_exclusive)  in hsr_forward_do()
396 		/* Don't send frame over port where it has been sent before.  in hsr_forward_do()
399 		if (!frame->is_from_san &&  in hsr_forward_do()
400 		    hsr_register_frame_out(port, frame->node_src,  in hsr_forward_do()
401 					   frame->sequence_nr))  in hsr_forward_do()
404 		if (frame->is_supervision && port->type == HSR_PT_MASTER) {  in hsr_forward_do()
405 			hsr_handle_sup_frame(frame);  in hsr_forward_do()
409 		/* Check if frame is to be dropped. Eg. for PRP no forward  in hsr_forward_do()
413 		    hsr->proto_ops->drop_frame(frame, port))  in hsr_forward_do()
417 			skb = hsr->proto_ops->create_tagged_frame(frame, port);  in hsr_forward_do()
419 			skb = hsr->proto_ops->get_untagged_frame(frame, port);  in hsr_forward_do()
422 			frame->port_rcv->dev->stats.rx_dropped++;  in hsr_forward_do()
428 			hsr_deliver_master(skb, port->dev, frame->node_src);  in hsr_forward_do()
430 			if (!hsr_xmit(skb, port, frame))  in hsr_forward_do()
437 			     struct hsr_frame_info *frame)  in check_local_dest()  argument
440 		frame->is_local_exclusive = true;  in check_local_dest()
443 		frame->is_local_exclusive = false;  in check_local_dest()
449 		frame->is_local_dest = true;  in check_local_dest()
451 		frame->is_local_dest = false;  in check_local_dest()
456 			     struct hsr_frame_info *frame)  in handle_std_frame()  argument
458 	struct hsr_port *port = frame->port_rcv;  in handle_std_frame()
462 	frame->skb_hsr = NULL;  in handle_std_frame()
463 	frame->skb_prp = NULL;  in handle_std_frame()
464 	frame->skb_std = skb;  in handle_std_frame()
467 		frame->is_from_san = true;  in handle_std_frame()
471 		frame->sequence_nr = hsr->sequence_nr;  in handle_std_frame()
478 			struct hsr_frame_info *frame)  in hsr_fill_frame_info()  argument
480 	struct hsr_port *port = frame->port_rcv;  in hsr_fill_frame_info()
490 		/* HSR tagged frame :- Data or Supervision */  in hsr_fill_frame_info()
491 		frame->skb_std = NULL;  in hsr_fill_frame_info()
492 		frame->skb_prp = NULL;  in hsr_fill_frame_info()
493 		frame->skb_hsr = skb;  in hsr_fill_frame_info()
494 		frame->sequence_nr = hsr_get_skb_sequence_nr(skb);  in hsr_fill_frame_info()
498 	/* Standard frame or PRP from master port */  in hsr_fill_frame_info()
499 	handle_std_frame(skb, frame);  in hsr_fill_frame_info()
505 			struct hsr_frame_info *frame)  in prp_fill_frame_info()  argument
507 	/* Supervision frame */  in prp_fill_frame_info()
511 	    prp_check_lsdu_size(skb, rct, frame->is_supervision)) {  in prp_fill_frame_info()
512 		frame->skb_hsr = NULL;  in prp_fill_frame_info()
513 		frame->skb_std = NULL;  in prp_fill_frame_info()
514 		frame->skb_prp = skb;  in prp_fill_frame_info()
515 		frame->sequence_nr = prp_get_skb_sequence_nr(rct);  in prp_fill_frame_info()
518 	handle_std_frame(skb, frame);  in prp_fill_frame_info()
523 static int fill_frame_info(struct hsr_frame_info *frame,  in fill_frame_info()  argument
536 	memset(frame, 0, sizeof(*frame));  in fill_frame_info()
537 	frame->is_supervision = is_supervision_frame(port->hsr, skb);  in fill_frame_info()
538 	frame->node_src = hsr_get_node(port, &hsr->node_db, skb,  in fill_frame_info()
539 				       frame->is_supervision,  in fill_frame_info()
541 	if (!frame->node_src)  in fill_frame_info()
545 	frame->is_vlan = false;  in fill_frame_info()
549 		frame->is_vlan = true;  in fill_frame_info()
551 	if (frame->is_vlan) {  in fill_frame_info()
558 	frame->is_from_san = false;  in fill_frame_info()
559 	frame->port_rcv = port;  in fill_frame_info()
560 	ret = hsr->proto_ops->fill_frame_info(proto, skb, frame);  in fill_frame_info()
564 	check_local_dest(port->hsr, skb, frame);  in fill_frame_info()
572 	struct hsr_frame_info frame;  in hsr_forward_skb()  local
574 	if (fill_frame_info(&frame, skb, port) < 0)  in hsr_forward_skb()
577 	hsr_register_frame_in(frame.node_src, port, frame.sequence_nr);  in hsr_forward_skb()
578 	hsr_forward_do(&frame);  in hsr_forward_skb()
587 	kfree_skb(frame.skb_hsr);  in hsr_forward_skb()
588 	kfree_skb(frame.skb_prp);  in hsr_forward_skb()
589 	kfree_skb(frame.skb_std);  in hsr_forward_skb()