1 /* Copyright 2011-2014 Autronica Fire and Security AS
9  *	2011-2014 Arvid Brodin, arvid.brodin@alten.se
40  *    --
41  *    Or not - resetting the counter and bridging the frame would create a
45  *    frame is received from a particular node, we know something is wrong.
61 	if (!ether_addr_equal(ethHdr->h_dest,  in is_supervision_frame()
62 			      hsr->sup_multicast_addr))  in is_supervision_frame()
66 	if (!(ethHdr->h_proto == htons(ETH_P_PRP)  in is_supervision_frame()
67 			|| ethHdr->h_proto == htons(ETH_P_HSR)))  in is_supervision_frame()
71 	if (ethHdr->h_proto == htons(ETH_P_HSR)) { /* Okay HSRv1. */  in is_supervision_frame()
73 		if (hsrV1Hdr->hsr.encap_proto != htons(ETH_P_PRP))  in is_supervision_frame()
76 		hsrSupTag = &hsrV1Hdr->hsr_sup;  in is_supervision_frame()
78 		hsrSupTag = &((struct hsrv0_ethhdr_sp *) skb_mac_header(skb))->hsr_sup;  in is_supervision_frame()
81 	if ((hsrSupTag->HSR_TLV_Type != HSR_TLV_ANNOUNCE) &&  in is_supervision_frame()
82 	    (hsrSupTag->HSR_TLV_Type != HSR_TLV_LIFE_CHECK))  in is_supervision_frame()
84 	if ((hsrSupTag->HSR_TLV_Length != 12) &&  in is_supervision_frame()
85 			(hsrSupTag->HSR_TLV_Length !=  in is_supervision_frame()
94 					   struct hsr_frame_info *frame)  in create_stripped_skb()  argument
101 	skb = __pskb_copy(skb_in, skb_headroom(skb_in) - HSR_HLEN, GFP_ATOMIC);  in create_stripped_skb()
108 	if (skb->ip_summed == CHECKSUM_PARTIAL)  in create_stripped_skb()
109 		skb->csum_start -= HSR_HLEN;  in create_stripped_skb()
112 	if (frame->is_vlan)  in create_stripped_skb()
118 	skb->protocol = eth_hdr(skb)->h_proto;  in create_stripped_skb()
122 static struct sk_buff *frame_get_stripped_skb(struct hsr_frame_info *frame,  in frame_get_stripped_skb()  argument
125 	if (!frame->skb_std)  in frame_get_stripped_skb()
126 		frame->skb_std = create_stripped_skb(frame->skb_hsr, frame);  in frame_get_stripped_skb()
127 	return skb_clone(frame->skb_std, GFP_ATOMIC);  in frame_get_stripped_skb()
131 static void hsr_fill_tag(struct sk_buff *skb, struct hsr_frame_info *frame,  in hsr_fill_tag()  argument
138 	if (port->type == HSR_PT_SLAVE_A)  in hsr_fill_tag()
143 	lsdu_size = skb->len - 14;  in hsr_fill_tag()
144 	if (frame->is_vlan)  in hsr_fill_tag()
145 		lsdu_size -= 4;  in hsr_fill_tag()
149 	set_hsr_tag_path(&hsr_ethhdr->hsr_tag, lane_id);  in hsr_fill_tag()
150 	set_hsr_tag_LSDU_size(&hsr_ethhdr->hsr_tag, lsdu_size);  in hsr_fill_tag()
151 	hsr_ethhdr->hsr_tag.sequence_nr = htons(frame->sequence_nr);  in hsr_fill_tag()
152 	hsr_ethhdr->hsr_tag.encap_proto = hsr_ethhdr->ethhdr.h_proto;  in hsr_fill_tag()
153 	hsr_ethhdr->ethhdr.h_proto = htons(protoVersion ?  in hsr_fill_tag()
158 					 struct hsr_frame_info *frame,  in create_tagged_skb()  argument
171 	if (skb->ip_summed == CHECKSUM_PARTIAL)  in create_tagged_skb()
172 		skb->csum_start += HSR_HLEN;  in create_tagged_skb()
175 	if (frame->is_vlan)  in create_tagged_skb()
183 	hsr_fill_tag(skb, frame, port, port->hsr->protVersion);  in create_tagged_skb()
188 /* If the original frame was an HSR tagged frame, just clone it to be sent
189  * unchanged. Otherwise, create a private frame especially tagged for 'port'.
191 static struct sk_buff *frame_get_tagged_skb(struct hsr_frame_info *frame,  in frame_get_tagged_skb()  argument
194 	if (frame->skb_hsr)  in frame_get_tagged_skb()
195 		return skb_clone(frame->skb_hsr, GFP_ATOMIC);  in frame_get_tagged_skb()
197 	if ((port->type != HSR_PT_SLAVE_A) && (port->type != HSR_PT_SLAVE_B)) {  in frame_get_tagged_skb()
198 		WARN_ONCE(1, "HSR: Bug: trying to create a tagged frame for a non-ring port");  in frame_get_tagged_skb()
202 	return create_tagged_skb(frame->skb_std, frame, port);  in frame_get_tagged_skb()
212 	was_multicast_frame = (skb->pkt_type == PACKET_MULTICAST);  in hsr_deliver_master()
217 		dev->stats.rx_dropped++;  in hsr_deliver_master()
219 		dev->stats.rx_packets++;  in hsr_deliver_master()
220 		dev->stats.rx_bytes += skb->len;  in hsr_deliver_master()
222 			dev->stats.multicast++;  in hsr_deliver_master()
227 		    struct hsr_frame_info *frame)  in hsr_xmit()  argument
229 	if (frame->port_rcv->type == HSR_PT_MASTER) {  in hsr_xmit()
230 		hsr_addr_subst_dest(frame->node_src, skb, port);  in hsr_xmit()
232 		/* Address substitution (IEC62439-3 pp 26, 50): replace mac  in hsr_xmit()
233 		 * address of outgoing frame with that of the outgoing slave's.  in hsr_xmit()
235 		ether_addr_copy(eth_hdr(skb)->h_source, port->dev->dev_addr);  in hsr_xmit()
241 /* Forward the frame through all devices except:
242  * - Back through the receiving device
243  * - If it's a HSR frame: through a device where it has passed before
244  * - To the local HSR master only if the frame is directly addressed to it, or
245  *   a non-supervision multicast or broadcast frame.
247  * HSR slave devices should insert a HSR tag into the frame, or forward the
248  * frame unchanged if it's already tagged. Interlink devices should strip HSR
249  * tags if they're of the non-HSR type (but only after duplicate discard). The
250  * master device always strips HSR tags.
252 static void hsr_forward_do(struct hsr_frame_info *frame)  in hsr_forward_do()  argument
257 	hsr_for_each_port(frame->port_rcv->hsr, port) {  in hsr_forward_do()
258 		/* Don't send frame back the way it came */  in hsr_forward_do()
259 		if (port == frame->port_rcv)  in hsr_forward_do()
263 		if ((port->type == HSR_PT_MASTER) && !frame->is_local_dest)  in hsr_forward_do()
266 		/* Deliver frames directly addressed to us to master only */  in hsr_forward_do()
267 		if ((port->type != HSR_PT_MASTER) && frame->is_local_exclusive)  in hsr_forward_do()
270 		/* Don't send frame over port where it has been sent before */  in hsr_forward_do()
271 		if (hsr_register_frame_out(port, frame->node_src,  in hsr_forward_do()
272 					   frame->sequence_nr))  in hsr_forward_do()
275 		if (frame->is_supervision && (port->type == HSR_PT_MASTER)) {  in hsr_forward_do()
276 			hsr_handle_sup_frame(frame->skb_hsr,  in hsr_forward_do()
277 					     frame->node_src,  in hsr_forward_do()
278 					     frame->port_rcv);  in hsr_forward_do()
282 		if (port->type != HSR_PT_MASTER)  in hsr_forward_do()
283 			skb = frame_get_tagged_skb(frame, port);  in hsr_forward_do()
285 			skb = frame_get_stripped_skb(frame, port);  in hsr_forward_do()
287 			/* FIXME: Record the dropped frame? */  in hsr_forward_do()
291 		skb->dev = port->dev;  in hsr_forward_do()
292 		if (port->type == HSR_PT_MASTER)  in hsr_forward_do()
293 			hsr_deliver_master(skb, port->dev, frame->node_src);  in hsr_forward_do()
295 			hsr_xmit(skb, port, frame);  in hsr_forward_do()
301 			     struct hsr_frame_info *frame)  in check_local_dest()  argument
303 	if (hsr_addr_is_self(hsr, eth_hdr(skb)->h_dest)) {  in check_local_dest()
304 		frame->is_local_exclusive = true;  in check_local_dest()
305 		skb->pkt_type = PACKET_HOST;  in check_local_dest()
307 		frame->is_local_exclusive = false;  in check_local_dest()
310 	if ((skb->pkt_type == PACKET_HOST) ||  in check_local_dest()
311 	    (skb->pkt_type == PACKET_MULTICAST) ||  in check_local_dest()
312 	    (skb->pkt_type == PACKET_BROADCAST)) {  in check_local_dest()
313 		frame->is_local_dest = true;  in check_local_dest()
315 		frame->is_local_dest = false;  in check_local_dest()
320 static int hsr_fill_frame_info(struct hsr_frame_info *frame,  in hsr_fill_frame_info()  argument
326 	frame->is_supervision = is_supervision_frame(port->hsr, skb);  in hsr_fill_frame_info()
327 	frame->node_src = hsr_get_node(port, skb, frame->is_supervision);  in hsr_fill_frame_info()
328 	if (frame->node_src == NULL)  in hsr_fill_frame_info()
329 		return -1; /* Unknown node and !is_supervision, or no mem */  in hsr_fill_frame_info()
332 	frame->is_vlan = false;  in hsr_fill_frame_info()
333 	if (ethhdr->h_proto == htons(ETH_P_8021Q)) {  in hsr_fill_frame_info()
334 		frame->is_vlan = true;  in hsr_fill_frame_info()
338 	if (ethhdr->h_proto == htons(ETH_P_PRP)  in hsr_fill_frame_info()
339 			|| ethhdr->h_proto == htons(ETH_P_HSR)) {  in hsr_fill_frame_info()
340 		frame->skb_std = NULL;  in hsr_fill_frame_info()
341 		frame->skb_hsr = skb;  in hsr_fill_frame_info()
342 		frame->sequence_nr = hsr_get_skb_sequence_nr(skb);  in hsr_fill_frame_info()
344 		frame->skb_std = skb;  in hsr_fill_frame_info()
345 		frame->skb_hsr = NULL;  in hsr_fill_frame_info()
346 		/* Sequence nr for the master node */  in hsr_fill_frame_info()
347 		spin_lock_irqsave(&port->hsr->seqnr_lock, irqflags);  in hsr_fill_frame_info()
348 		frame->sequence_nr = port->hsr->sequence_nr;  in hsr_fill_frame_info()
349 		port->hsr->sequence_nr++;  in hsr_fill_frame_info()
350 		spin_unlock_irqrestore(&port->hsr->seqnr_lock, irqflags);  in hsr_fill_frame_info()
353 	frame->port_rcv = port;  in hsr_fill_frame_info()
354 	check_local_dest(port->hsr, skb, frame);  in hsr_fill_frame_info()
362 	struct hsr_frame_info frame;  in hsr_forward_skb()  local
364 	if (skb_mac_header(skb) != skb->data) {  in hsr_forward_skb()
365 		WARN_ONCE(1, "%s:%d: Malformed frame (port_src %s)\n",  in hsr_forward_skb()
366 			  __FILE__, __LINE__, port->dev->name);  in hsr_forward_skb()
370 	if (hsr_fill_frame_info(&frame, skb, port) < 0)  in hsr_forward_skb()
372 	hsr_register_frame_in(frame.node_src, port, frame.sequence_nr);  in hsr_forward_skb()
373 	hsr_forward_do(&frame);  in hsr_forward_skb()
375 	if (frame.skb_hsr != NULL)  in hsr_forward_skb()
376 		kfree_skb(frame.skb_hsr);  in hsr_forward_skb()
377 	if (frame.skb_std != NULL)  in hsr_forward_skb()
378 		kfree_skb(frame.skb_std);  in hsr_forward_skb()
382 	port->dev->stats.tx_dropped++;  in hsr_forward_skb()