xref: /openbmc/linux/net/hsr/hsr_framereg.c (revision b02a9a0c)
1 // SPDX-License-Identifier: GPL-2.0
2 /* Copyright 2011-2014 Autronica Fire and Security AS
3  *
4  * Author(s):
5  *	2011-2014 Arvid Brodin, arvid.brodin@alten.se
6  *
7  * The HSR spec says never to forward the same frame twice on the same
8  * interface. A frame is identified by its source MAC address and its HSR
9  * sequence number. This code keeps track of senders and their sequence numbers
10  * to allow filtering of duplicate frames, and to detect HSR ring errors.
11  * Same code handles filtering of duplicates for PRP as well.
12  */
13 
14 #include <linux/if_ether.h>
15 #include <linux/etherdevice.h>
16 #include <linux/slab.h>
17 #include <linux/rculist.h>
18 #include "hsr_main.h"
19 #include "hsr_framereg.h"
20 #include "hsr_netlink.h"
21 
22 /* seq_nr_after(a, b) - return true if a is after (higher in sequence than) b,
23  * false otherwise.
24  */
25 static bool seq_nr_after(u16 a, u16 b)
26 {
27 	/* Remove inconsistency where
28 	 * seq_nr_after(a, b) == seq_nr_before(a, b)
29 	 */
30 	if ((int)b - a == 32768)
31 		return false;
32 
33 	return (((s16)(b - a)) < 0);
34 }
35 
36 #define seq_nr_before(a, b)		seq_nr_after((b), (a))
37 #define seq_nr_before_or_eq(a, b)	(!seq_nr_after((a), (b)))
38 
39 bool hsr_addr_is_self(struct hsr_priv *hsr, unsigned char *addr)
40 {
41 	struct hsr_self_node *sn;
42 	bool ret = false;
43 
44 	rcu_read_lock();
45 	sn = rcu_dereference(hsr->self_node);
46 	if (!sn) {
47 		WARN_ONCE(1, "HSR: No self node\n");
48 		goto out;
49 	}
50 
51 	if (ether_addr_equal(addr, sn->macaddress_A) ||
52 	    ether_addr_equal(addr, sn->macaddress_B))
53 		ret = true;
54 out:
55 	rcu_read_unlock();
56 	return ret;
57 }
58 
59 /* Search for mac entry. Caller must hold rcu read lock.
60  */
61 static struct hsr_node *find_node_by_addr_A(struct list_head *node_db,
62 					    const unsigned char addr[ETH_ALEN])
63 {
64 	struct hsr_node *node;
65 
66 	list_for_each_entry_rcu(node, node_db, mac_list) {
67 		if (ether_addr_equal(node->macaddress_A, addr))
68 			return node;
69 	}
70 
71 	return NULL;
72 }
73 
74 /* Helper for device init; the self_node is used in hsr_rcv() to recognize
75  * frames from self that's been looped over the HSR ring.
76  */
77 int hsr_create_self_node(struct hsr_priv *hsr,
78 			 const unsigned char addr_a[ETH_ALEN],
79 			 const unsigned char addr_b[ETH_ALEN])
80 {
81 	struct hsr_self_node *sn, *old;
82 
83 	sn = kmalloc(sizeof(*sn), GFP_KERNEL);
84 	if (!sn)
85 		return -ENOMEM;
86 
87 	ether_addr_copy(sn->macaddress_A, addr_a);
88 	ether_addr_copy(sn->macaddress_B, addr_b);
89 
90 	spin_lock_bh(&hsr->list_lock);
91 	old = rcu_replace_pointer(hsr->self_node, sn,
92 				  lockdep_is_held(&hsr->list_lock));
93 	spin_unlock_bh(&hsr->list_lock);
94 
95 	if (old)
96 		kfree_rcu(old, rcu_head);
97 	return 0;
98 }
99 
100 void hsr_del_self_node(struct hsr_priv *hsr)
101 {
102 	struct hsr_self_node *old;
103 
104 	spin_lock_bh(&hsr->list_lock);
105 	old = rcu_replace_pointer(hsr->self_node, NULL,
106 				  lockdep_is_held(&hsr->list_lock));
107 	spin_unlock_bh(&hsr->list_lock);
108 	if (old)
109 		kfree_rcu(old, rcu_head);
110 }
111 
112 void hsr_del_nodes(struct list_head *node_db)
113 {
114 	struct hsr_node *node;
115 	struct hsr_node *tmp;
116 
117 	list_for_each_entry_safe(node, tmp, node_db, mac_list)
118 		kfree(node);
119 }
120 
121 void prp_handle_san_frame(bool san, enum hsr_port_type port,
122 			  struct hsr_node *node)
123 {
124 	/* Mark if the SAN node is over LAN_A or LAN_B */
125 	if (port == HSR_PT_SLAVE_A) {
126 		node->san_a = true;
127 		return;
128 	}
129 
130 	if (port == HSR_PT_SLAVE_B)
131 		node->san_b = true;
132 }
133 
134 /* Allocate an hsr_node and add it to node_db. 'addr' is the node's address_A;
135  * seq_out is used to initialize filtering of outgoing duplicate frames
136  * originating from the newly added node.
137  */
138 static struct hsr_node *hsr_add_node(struct hsr_priv *hsr,
139 				     struct list_head *node_db,
140 				     unsigned char addr[],
141 				     u16 seq_out, bool san,
142 				     enum hsr_port_type rx_port)
143 {
144 	struct hsr_node *new_node, *node;
145 	unsigned long now;
146 	int i;
147 
148 	new_node = kzalloc(sizeof(*new_node), GFP_ATOMIC);
149 	if (!new_node)
150 		return NULL;
151 
152 	ether_addr_copy(new_node->macaddress_A, addr);
153 	spin_lock_init(&new_node->seq_out_lock);
154 
155 	/* We are only interested in time diffs here, so use current jiffies
156 	 * as initialization. (0 could trigger an spurious ring error warning).
157 	 */
158 	now = jiffies;
159 	for (i = 0; i < HSR_PT_PORTS; i++) {
160 		new_node->time_in[i] = now;
161 		new_node->time_out[i] = now;
162 	}
163 	for (i = 0; i < HSR_PT_PORTS; i++)
164 		new_node->seq_out[i] = seq_out;
165 
166 	if (san && hsr->proto_ops->handle_san_frame)
167 		hsr->proto_ops->handle_san_frame(san, rx_port, new_node);
168 
169 	spin_lock_bh(&hsr->list_lock);
170 	list_for_each_entry_rcu(node, node_db, mac_list,
171 				lockdep_is_held(&hsr->list_lock)) {
172 		if (ether_addr_equal(node->macaddress_A, addr))
173 			goto out;
174 		if (ether_addr_equal(node->macaddress_B, addr))
175 			goto out;
176 	}
177 	list_add_tail_rcu(&new_node->mac_list, node_db);
178 	spin_unlock_bh(&hsr->list_lock);
179 	return new_node;
180 out:
181 	spin_unlock_bh(&hsr->list_lock);
182 	kfree(new_node);
183 	return node;
184 }
185 
186 void prp_update_san_info(struct hsr_node *node, bool is_sup)
187 {
188 	if (!is_sup)
189 		return;
190 
191 	node->san_a = false;
192 	node->san_b = false;
193 }
194 
195 /* Get the hsr_node from which 'skb' was sent.
196  */
197 struct hsr_node *hsr_get_node(struct hsr_port *port, struct list_head *node_db,
198 			      struct sk_buff *skb, bool is_sup,
199 			      enum hsr_port_type rx_port)
200 {
201 	struct hsr_priv *hsr = port->hsr;
202 	struct hsr_node *node;
203 	struct ethhdr *ethhdr;
204 	struct prp_rct *rct;
205 	bool san = false;
206 	u16 seq_out;
207 
208 	if (!skb_mac_header_was_set(skb))
209 		return NULL;
210 
211 	ethhdr = (struct ethhdr *)skb_mac_header(skb);
212 
213 	list_for_each_entry_rcu(node, node_db, mac_list) {
214 		if (ether_addr_equal(node->macaddress_A, ethhdr->h_source)) {
215 			if (hsr->proto_ops->update_san_info)
216 				hsr->proto_ops->update_san_info(node, is_sup);
217 			return node;
218 		}
219 		if (ether_addr_equal(node->macaddress_B, ethhdr->h_source)) {
220 			if (hsr->proto_ops->update_san_info)
221 				hsr->proto_ops->update_san_info(node, is_sup);
222 			return node;
223 		}
224 	}
225 
226 	/* Everyone may create a node entry, connected node to a HSR/PRP
227 	 * device.
228 	 */
229 	if (ethhdr->h_proto == htons(ETH_P_PRP) ||
230 	    ethhdr->h_proto == htons(ETH_P_HSR)) {
231 		/* Use the existing sequence_nr from the tag as starting point
232 		 * for filtering duplicate frames.
233 		 */
234 		seq_out = hsr_get_skb_sequence_nr(skb) - 1;
235 	} else {
236 		rct = skb_get_PRP_rct(skb);
237 		if (rct && prp_check_lsdu_size(skb, rct, is_sup)) {
238 			seq_out = prp_get_skb_sequence_nr(rct);
239 		} else {
240 			if (rx_port != HSR_PT_MASTER)
241 				san = true;
242 			seq_out = HSR_SEQNR_START;
243 		}
244 	}
245 
246 	return hsr_add_node(hsr, node_db, ethhdr->h_source, seq_out,
247 			    san, rx_port);
248 }
249 
250 /* Use the Supervision frame's info about an eventual macaddress_B for merging
251  * nodes that has previously had their macaddress_B registered as a separate
252  * node.
253  */
254 void hsr_handle_sup_frame(struct hsr_frame_info *frame)
255 {
256 	struct hsr_node *node_curr = frame->node_src;
257 	struct hsr_port *port_rcv = frame->port_rcv;
258 	struct hsr_priv *hsr = port_rcv->hsr;
259 	struct hsr_sup_payload *hsr_sp;
260 	struct hsr_sup_tlv *hsr_sup_tlv;
261 	struct hsr_node *node_real;
262 	struct sk_buff *skb = NULL;
263 	struct list_head *node_db;
264 	struct ethhdr *ethhdr;
265 	int i;
266 	unsigned int pull_size = 0;
267 	unsigned int total_pull_size = 0;
268 
269 	/* Here either frame->skb_hsr or frame->skb_prp should be
270 	 * valid as supervision frame always will have protocol
271 	 * header info.
272 	 */
273 	if (frame->skb_hsr)
274 		skb = frame->skb_hsr;
275 	else if (frame->skb_prp)
276 		skb = frame->skb_prp;
277 	else if (frame->skb_std)
278 		skb = frame->skb_std;
279 	if (!skb)
280 		return;
281 
282 	/* Leave the ethernet header. */
283 	pull_size = sizeof(struct ethhdr);
284 	skb_pull(skb, pull_size);
285 	total_pull_size += pull_size;
286 
287 	ethhdr = (struct ethhdr *)skb_mac_header(skb);
288 
289 	/* And leave the HSR tag. */
290 	if (ethhdr->h_proto == htons(ETH_P_HSR)) {
291 		pull_size = sizeof(struct ethhdr);
292 		skb_pull(skb, pull_size);
293 		total_pull_size += pull_size;
294 	}
295 
296 	/* And leave the HSR sup tag. */
297 	pull_size = sizeof(struct hsr_tag);
298 	skb_pull(skb, pull_size);
299 	total_pull_size += pull_size;
300 
301 	/* get HSR sup payload */
302 	hsr_sp = (struct hsr_sup_payload *)skb->data;
303 
304 	/* Merge node_curr (registered on macaddress_B) into node_real */
305 	node_db = &port_rcv->hsr->node_db;
306 	node_real = find_node_by_addr_A(node_db, hsr_sp->macaddress_A);
307 	if (!node_real)
308 		/* No frame received from AddrA of this node yet */
309 		node_real = hsr_add_node(hsr, node_db, hsr_sp->macaddress_A,
310 					 HSR_SEQNR_START - 1, true,
311 					 port_rcv->type);
312 	if (!node_real)
313 		goto done; /* No mem */
314 	if (node_real == node_curr)
315 		/* Node has already been merged */
316 		goto done;
317 
318 	/* Leave the first HSR sup payload. */
319 	pull_size = sizeof(struct hsr_sup_payload);
320 	skb_pull(skb, pull_size);
321 	total_pull_size += pull_size;
322 
323 	/* Get second supervision tlv */
324 	hsr_sup_tlv = (struct hsr_sup_tlv *)skb->data;
325 	/* And check if it is a redbox mac TLV */
326 	if (hsr_sup_tlv->HSR_TLV_type == PRP_TLV_REDBOX_MAC) {
327 		/* We could stop here after pushing hsr_sup_payload,
328 		 * or proceed and allow macaddress_B and for redboxes.
329 		 */
330 		/* Sanity check length */
331 		if (hsr_sup_tlv->HSR_TLV_length != 6)
332 			goto done;
333 
334 		/* Leave the second HSR sup tlv. */
335 		pull_size = sizeof(struct hsr_sup_tlv);
336 		skb_pull(skb, pull_size);
337 		total_pull_size += pull_size;
338 
339 		/* Get redbox mac address. */
340 		hsr_sp = (struct hsr_sup_payload *)skb->data;
341 
342 		/* Check if redbox mac and node mac are equal. */
343 		if (!ether_addr_equal(node_real->macaddress_A, hsr_sp->macaddress_A)) {
344 			/* This is a redbox supervision frame for a VDAN! */
345 			goto done;
346 		}
347 	}
348 
349 	ether_addr_copy(node_real->macaddress_B, ethhdr->h_source);
350 	spin_lock_bh(&node_real->seq_out_lock);
351 	for (i = 0; i < HSR_PT_PORTS; i++) {
352 		if (!node_curr->time_in_stale[i] &&
353 		    time_after(node_curr->time_in[i], node_real->time_in[i])) {
354 			node_real->time_in[i] = node_curr->time_in[i];
355 			node_real->time_in_stale[i] =
356 						node_curr->time_in_stale[i];
357 		}
358 		if (seq_nr_after(node_curr->seq_out[i], node_real->seq_out[i]))
359 			node_real->seq_out[i] = node_curr->seq_out[i];
360 	}
361 	spin_unlock_bh(&node_real->seq_out_lock);
362 	node_real->addr_B_port = port_rcv->type;
363 
364 	spin_lock_bh(&hsr->list_lock);
365 	if (!node_curr->removed) {
366 		list_del_rcu(&node_curr->mac_list);
367 		node_curr->removed = true;
368 		kfree_rcu(node_curr, rcu_head);
369 	}
370 	spin_unlock_bh(&hsr->list_lock);
371 
372 done:
373 	/* Push back here */
374 	skb_push(skb, total_pull_size);
375 }
376 
377 /* 'skb' is a frame meant for this host, that is to be passed to upper layers.
378  *
379  * If the frame was sent by a node's B interface, replace the source
380  * address with that node's "official" address (macaddress_A) so that upper
381  * layers recognize where it came from.
382  */
383 void hsr_addr_subst_source(struct hsr_node *node, struct sk_buff *skb)
384 {
385 	if (!skb_mac_header_was_set(skb)) {
386 		WARN_ONCE(1, "%s: Mac header not set\n", __func__);
387 		return;
388 	}
389 
390 	memcpy(&eth_hdr(skb)->h_source, node->macaddress_A, ETH_ALEN);
391 }
392 
393 /* 'skb' is a frame meant for another host.
394  * 'port' is the outgoing interface
395  *
396  * Substitute the target (dest) MAC address if necessary, so the it matches the
397  * recipient interface MAC address, regardless of whether that is the
398  * recipient's A or B interface.
399  * This is needed to keep the packets flowing through switches that learn on
400  * which "side" the different interfaces are.
401  */
402 void hsr_addr_subst_dest(struct hsr_node *node_src, struct sk_buff *skb,
403 			 struct hsr_port *port)
404 {
405 	struct hsr_node *node_dst;
406 
407 	if (!skb_mac_header_was_set(skb)) {
408 		WARN_ONCE(1, "%s: Mac header not set\n", __func__);
409 		return;
410 	}
411 
412 	if (!is_unicast_ether_addr(eth_hdr(skb)->h_dest))
413 		return;
414 
415 	node_dst = find_node_by_addr_A(&port->hsr->node_db,
416 				       eth_hdr(skb)->h_dest);
417 	if (!node_dst) {
418 		if (port->hsr->prot_version != PRP_V1 && net_ratelimit())
419 			netdev_err(skb->dev, "%s: Unknown node\n", __func__);
420 		return;
421 	}
422 	if (port->type != node_dst->addr_B_port)
423 		return;
424 
425 	if (is_valid_ether_addr(node_dst->macaddress_B))
426 		ether_addr_copy(eth_hdr(skb)->h_dest, node_dst->macaddress_B);
427 }
428 
429 void hsr_register_frame_in(struct hsr_node *node, struct hsr_port *port,
430 			   u16 sequence_nr)
431 {
432 	/* Don't register incoming frames without a valid sequence number. This
433 	 * ensures entries of restarted nodes gets pruned so that they can
434 	 * re-register and resume communications.
435 	 */
436 	if (!(port->dev->features & NETIF_F_HW_HSR_TAG_RM) &&
437 	    seq_nr_before(sequence_nr, node->seq_out[port->type]))
438 		return;
439 
440 	node->time_in[port->type] = jiffies;
441 	node->time_in_stale[port->type] = false;
442 }
443 
444 /* 'skb' is a HSR Ethernet frame (with a HSR tag inserted), with a valid
445  * ethhdr->h_source address and skb->mac_header set.
446  *
447  * Return:
448  *	 1 if frame can be shown to have been sent recently on this interface,
449  *	 0 otherwise, or
450  *	 negative error code on error
451  */
452 int hsr_register_frame_out(struct hsr_port *port, struct hsr_node *node,
453 			   u16 sequence_nr)
454 {
455 	spin_lock_bh(&node->seq_out_lock);
456 	if (seq_nr_before_or_eq(sequence_nr, node->seq_out[port->type]) &&
457 	    time_is_after_jiffies(node->time_out[port->type] +
458 	    msecs_to_jiffies(HSR_ENTRY_FORGET_TIME))) {
459 		spin_unlock_bh(&node->seq_out_lock);
460 		return 1;
461 	}
462 
463 	node->time_out[port->type] = jiffies;
464 	node->seq_out[port->type] = sequence_nr;
465 	spin_unlock_bh(&node->seq_out_lock);
466 	return 0;
467 }
468 
469 static struct hsr_port *get_late_port(struct hsr_priv *hsr,
470 				      struct hsr_node *node)
471 {
472 	if (node->time_in_stale[HSR_PT_SLAVE_A])
473 		return hsr_port_get_hsr(hsr, HSR_PT_SLAVE_A);
474 	if (node->time_in_stale[HSR_PT_SLAVE_B])
475 		return hsr_port_get_hsr(hsr, HSR_PT_SLAVE_B);
476 
477 	if (time_after(node->time_in[HSR_PT_SLAVE_B],
478 		       node->time_in[HSR_PT_SLAVE_A] +
479 					msecs_to_jiffies(MAX_SLAVE_DIFF)))
480 		return hsr_port_get_hsr(hsr, HSR_PT_SLAVE_A);
481 	if (time_after(node->time_in[HSR_PT_SLAVE_A],
482 		       node->time_in[HSR_PT_SLAVE_B] +
483 					msecs_to_jiffies(MAX_SLAVE_DIFF)))
484 		return hsr_port_get_hsr(hsr, HSR_PT_SLAVE_B);
485 
486 	return NULL;
487 }
488 
489 /* Remove stale sequence_nr records. Called by timer every
490  * HSR_LIFE_CHECK_INTERVAL (two seconds or so).
491  */
492 void hsr_prune_nodes(struct timer_list *t)
493 {
494 	struct hsr_priv *hsr = from_timer(hsr, t, prune_timer);
495 	struct hsr_node *node;
496 	struct hsr_node *tmp;
497 	struct hsr_port *port;
498 	unsigned long timestamp;
499 	unsigned long time_a, time_b;
500 
501 	spin_lock_bh(&hsr->list_lock);
502 	list_for_each_entry_safe(node, tmp, &hsr->node_db, mac_list) {
503 		/* Don't prune own node. Neither time_in[HSR_PT_SLAVE_A]
504 		 * nor time_in[HSR_PT_SLAVE_B], will ever be updated for
505 		 * the master port. Thus the master node will be repeatedly
506 		 * pruned leading to packet loss.
507 		 */
508 		if (hsr_addr_is_self(hsr, node->macaddress_A))
509 			continue;
510 
511 		/* Shorthand */
512 		time_a = node->time_in[HSR_PT_SLAVE_A];
513 		time_b = node->time_in[HSR_PT_SLAVE_B];
514 
515 		/* Check for timestamps old enough to risk wrap-around */
516 		if (time_after(jiffies, time_a + MAX_JIFFY_OFFSET / 2))
517 			node->time_in_stale[HSR_PT_SLAVE_A] = true;
518 		if (time_after(jiffies, time_b + MAX_JIFFY_OFFSET / 2))
519 			node->time_in_stale[HSR_PT_SLAVE_B] = true;
520 
521 		/* Get age of newest frame from node.
522 		 * At least one time_in is OK here; nodes get pruned long
523 		 * before both time_ins can get stale
524 		 */
525 		timestamp = time_a;
526 		if (node->time_in_stale[HSR_PT_SLAVE_A] ||
527 		    (!node->time_in_stale[HSR_PT_SLAVE_B] &&
528 		    time_after(time_b, time_a)))
529 			timestamp = time_b;
530 
531 		/* Warn of ring error only as long as we get frames at all */
532 		if (time_is_after_jiffies(timestamp +
533 				msecs_to_jiffies(1.5 * MAX_SLAVE_DIFF))) {
534 			rcu_read_lock();
535 			port = get_late_port(hsr, node);
536 			if (port)
537 				hsr_nl_ringerror(hsr, node->macaddress_A, port);
538 			rcu_read_unlock();
539 		}
540 
541 		/* Prune old entries */
542 		if (time_is_before_jiffies(timestamp +
543 				msecs_to_jiffies(HSR_NODE_FORGET_TIME))) {
544 			hsr_nl_nodedown(hsr, node->macaddress_A);
545 			if (!node->removed) {
546 				list_del_rcu(&node->mac_list);
547 				node->removed = true;
548 				/* Note that we need to free this entry later: */
549 				kfree_rcu(node, rcu_head);
550 			}
551 		}
552 	}
553 	spin_unlock_bh(&hsr->list_lock);
554 
555 	/* Restart timer */
556 	mod_timer(&hsr->prune_timer,
557 		  jiffies + msecs_to_jiffies(PRUNE_PERIOD));
558 }
559 
560 void *hsr_get_next_node(struct hsr_priv *hsr, void *_pos,
561 			unsigned char addr[ETH_ALEN])
562 {
563 	struct hsr_node *node;
564 
565 	if (!_pos) {
566 		node = list_first_or_null_rcu(&hsr->node_db,
567 					      struct hsr_node, mac_list);
568 		if (node)
569 			ether_addr_copy(addr, node->macaddress_A);
570 		return node;
571 	}
572 
573 	node = _pos;
574 	list_for_each_entry_continue_rcu(node, &hsr->node_db, mac_list) {
575 		ether_addr_copy(addr, node->macaddress_A);
576 		return node;
577 	}
578 
579 	return NULL;
580 }
581 
582 int hsr_get_node_data(struct hsr_priv *hsr,
583 		      const unsigned char *addr,
584 		      unsigned char addr_b[ETH_ALEN],
585 		      unsigned int *addr_b_ifindex,
586 		      int *if1_age,
587 		      u16 *if1_seq,
588 		      int *if2_age,
589 		      u16 *if2_seq)
590 {
591 	struct hsr_node *node;
592 	struct hsr_port *port;
593 	unsigned long tdiff;
594 
595 	node = find_node_by_addr_A(&hsr->node_db, addr);
596 	if (!node)
597 		return -ENOENT;
598 
599 	ether_addr_copy(addr_b, node->macaddress_B);
600 
601 	tdiff = jiffies - node->time_in[HSR_PT_SLAVE_A];
602 	if (node->time_in_stale[HSR_PT_SLAVE_A])
603 		*if1_age = INT_MAX;
604 #if HZ <= MSEC_PER_SEC
605 	else if (tdiff > msecs_to_jiffies(INT_MAX))
606 		*if1_age = INT_MAX;
607 #endif
608 	else
609 		*if1_age = jiffies_to_msecs(tdiff);
610 
611 	tdiff = jiffies - node->time_in[HSR_PT_SLAVE_B];
612 	if (node->time_in_stale[HSR_PT_SLAVE_B])
613 		*if2_age = INT_MAX;
614 #if HZ <= MSEC_PER_SEC
615 	else if (tdiff > msecs_to_jiffies(INT_MAX))
616 		*if2_age = INT_MAX;
617 #endif
618 	else
619 		*if2_age = jiffies_to_msecs(tdiff);
620 
621 	/* Present sequence numbers as if they were incoming on interface */
622 	*if1_seq = node->seq_out[HSR_PT_SLAVE_B];
623 	*if2_seq = node->seq_out[HSR_PT_SLAVE_A];
624 
625 	if (node->addr_B_port != HSR_PT_NONE) {
626 		port = hsr_port_get_hsr(hsr, node->addr_B_port);
627 		*addr_b_ifindex = port->dev->ifindex;
628 	} else {
629 		*addr_b_ifindex = -1;
630 	}
631 
632 	return 0;
633 }
634