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()
207 				    struct hsr_frame_info *frame,  in hsr_fill_tag()  argument
218 	if (frame->is_vlan)  in hsr_fill_tag()
225 	hsr_ethhdr->hsr_tag.sequence_nr = htons(frame->sequence_nr);  in hsr_fill_tag()
233 /* If the original frame was an HSR tagged frame, just clone it to be sent
234  * unchanged. Otherwise, create a private frame especially tagged for 'port'.
236 struct sk_buff *hsr_create_tagged_frame(struct hsr_frame_info *frame,  in hsr_create_tagged_frame()  argument
243 	if (frame->skb_hsr) {  in hsr_create_tagged_frame()
245 			(struct hsr_ethhdr *)skb_mac_header(frame->skb_hsr);  in hsr_create_tagged_frame()
249 		return skb_clone(frame->skb_hsr, GFP_ATOMIC);  in hsr_create_tagged_frame()
253 	skb = __pskb_copy(frame->skb_std,  in hsr_create_tagged_frame()
254 			  skb_headroom(frame->skb_std) + HSR_HLEN, GFP_ATOMIC);  in hsr_create_tagged_frame()
263 	if (frame->is_vlan)  in hsr_create_tagged_frame()
274 	return hsr_fill_tag(skb, frame, port, port->hsr->prot_version);  in hsr_create_tagged_frame()
277 struct sk_buff *prp_create_tagged_frame(struct hsr_frame_info *frame,  in prp_create_tagged_frame()  argument
282 	if (frame->skb_prp) {  in prp_create_tagged_frame()
283 		struct prp_rct *trailer = skb_get_PRP_rct(frame->skb_prp);  in prp_create_tagged_frame()
291 		return skb_clone(frame->skb_prp, GFP_ATOMIC);  in prp_create_tagged_frame()
294 	skb = skb_copy_expand(frame->skb_std, 0,  in prp_create_tagged_frame()
295 			      skb_tailroom(frame->skb_std) + HSR_HLEN,  in prp_create_tagged_frame()
297 	prp_fill_rct(skb, frame, port);  in prp_create_tagged_frame()
323 		    struct hsr_frame_info *frame)  in hsr_xmit()  argument
325 	if (frame->port_rcv->type == HSR_PT_MASTER) {  in hsr_xmit()
326 		hsr_addr_subst_dest(frame->node_src, skb, port);  in hsr_xmit()
329 		 * address of outgoing frame with that of the outgoing slave's.  in hsr_xmit()
336 bool prp_drop_frame(struct hsr_frame_info *frame, struct hsr_port *port)  in prp_drop_frame()  argument
338 	return ((frame->port_rcv->type == HSR_PT_SLAVE_A &&  in prp_drop_frame()
340 		(frame->port_rcv->type == HSR_PT_SLAVE_B &&  in prp_drop_frame()
344 /* Forward the frame through all devices except:
346  * - If it's a HSR frame: through a device where it has passed before
347  * - if it's a PRP frame: through another PRP slave device (no bridge)
348  * - To the local HSR master only if the frame is directly addressed to it, or
349  *   a non-supervision multicast or broadcast frame.
351  * HSR slave devices should insert a HSR tag into the frame, or forward the
352  * frame unchanged if it's already tagged. Interlink devices should strip HSR
356 static void hsr_forward_do(struct hsr_frame_info *frame)  in hsr_forward_do()  argument
361 	hsr_for_each_port(frame->port_rcv->hsr, port) {  in hsr_forward_do()
363 		/* Don't send frame back the way it came */  in hsr_forward_do()
364 		if (port == frame->port_rcv)  in hsr_forward_do()
368 		if (port->type == HSR_PT_MASTER && !frame->is_local_dest)  in hsr_forward_do()
372 		if (port->type != HSR_PT_MASTER && frame->is_local_exclusive)  in hsr_forward_do()
375 		/* Don't send frame over port where it has been sent before.  in hsr_forward_do()
378 		if (!frame->is_from_san &&  in hsr_forward_do()
379 		    hsr_register_frame_out(port, frame->node_src,  in hsr_forward_do()
380 					   frame->sequence_nr))  in hsr_forward_do()
383 		if (frame->is_supervision && port->type == HSR_PT_MASTER) {  in hsr_forward_do()
384 			hsr_handle_sup_frame(frame);  in hsr_forward_do()
388 		/* Check if frame is to be dropped. Eg. for PRP no forward  in hsr_forward_do()
392 		    hsr->proto_ops->drop_frame(frame, port))  in hsr_forward_do()
396 			skb = hsr->proto_ops->create_tagged_frame(frame, port);  in hsr_forward_do()
398 			skb = hsr->proto_ops->get_untagged_frame(frame, port);  in hsr_forward_do()
401 			frame->port_rcv->dev->stats.rx_dropped++;  in hsr_forward_do()
407 			hsr_deliver_master(skb, port->dev, frame->node_src);  in hsr_forward_do()
409 			hsr_xmit(skb, port, frame);  in hsr_forward_do()
414 			     struct hsr_frame_info *frame)  in check_local_dest()  argument
417 		frame->is_local_exclusive = true;  in check_local_dest()
420 		frame->is_local_exclusive = false;  in check_local_dest()
426 		frame->is_local_dest = true;  in check_local_dest()
428 		frame->is_local_dest = false;  in check_local_dest()
433 			     struct hsr_frame_info *frame)  in handle_std_frame()  argument
435 	struct hsr_port *port = frame->port_rcv;  in handle_std_frame()
439 	frame->skb_hsr = NULL;  in handle_std_frame()
440 	frame->skb_prp = NULL;  in handle_std_frame()
441 	frame->skb_std = skb;  in handle_std_frame()
444 		frame->is_from_san = true;  in handle_std_frame()
448 		frame->sequence_nr = hsr->sequence_nr;  in handle_std_frame()
455 			 struct hsr_frame_info *frame)  in hsr_fill_frame_info()  argument
459 		/* HSR tagged frame :- Data or Supervision */  in hsr_fill_frame_info()
460 		frame->skb_std = NULL;  in hsr_fill_frame_info()
461 		frame->skb_prp = NULL;  in hsr_fill_frame_info()
462 		frame->skb_hsr = skb;  in hsr_fill_frame_info()
463 		frame->sequence_nr = hsr_get_skb_sequence_nr(skb);  in hsr_fill_frame_info()
467 	/* Standard frame or PRP from master port */  in hsr_fill_frame_info()
468 	handle_std_frame(skb, frame);  in hsr_fill_frame_info()
472 			 struct hsr_frame_info *frame)  in prp_fill_frame_info()  argument
474 	/* Supervision frame */  in prp_fill_frame_info()
478 	    prp_check_lsdu_size(skb, rct, frame->is_supervision)) {  in prp_fill_frame_info()
479 		frame->skb_hsr = NULL;  in prp_fill_frame_info()
480 		frame->skb_std = NULL;  in prp_fill_frame_info()
481 		frame->skb_prp = skb;  in prp_fill_frame_info()
482 		frame->sequence_nr = prp_get_skb_sequence_nr(rct);  in prp_fill_frame_info()
485 	handle_std_frame(skb, frame);  in prp_fill_frame_info()
488 static int fill_frame_info(struct hsr_frame_info *frame,  in fill_frame_info()  argument
496 	memset(frame, 0, sizeof(*frame));  in fill_frame_info()
497 	frame->is_supervision = is_supervision_frame(port->hsr, skb);  in fill_frame_info()
498 	frame->node_src = hsr_get_node(port, &hsr->node_db, skb,  in fill_frame_info()
499 				       frame->is_supervision,  in fill_frame_info()
501 	if (!frame->node_src)  in fill_frame_info()
505 	frame->is_vlan = false;  in fill_frame_info()
509 		frame->is_vlan = true;  in fill_frame_info()
511 	if (frame->is_vlan) {  in fill_frame_info()
518 	frame->is_from_san = false;  in fill_frame_info()
519 	frame->port_rcv = port;  in fill_frame_info()
520 	hsr->proto_ops->fill_frame_info(proto, skb, frame);  in fill_frame_info()
521 	check_local_dest(port->hsr, skb, frame);  in fill_frame_info()
529 	struct hsr_frame_info frame;  in hsr_forward_skb()  local
532 		WARN_ONCE(1, "%s:%d: Malformed frame (port_src %s)\n",  in hsr_forward_skb()
537 	if (fill_frame_info(&frame, skb, port) < 0)  in hsr_forward_skb()
540 	hsr_register_frame_in(frame.node_src, port, frame.sequence_nr);  in hsr_forward_skb()
541 	hsr_forward_do(&frame);  in hsr_forward_skb()
550 	kfree_skb(frame.skb_hsr);  in hsr_forward_skb()
551 	kfree_skb(frame.skb_prp);  in hsr_forward_skb()
552 	kfree_skb(frame.skb_std);  in hsr_forward_skb()