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Arvid Brodin70ebe4a2014-07-04 23:34:38 +02001/* Copyright 2011-2014 Autronica Fire and Security AS
Arvid Brodinf4214362013-10-30 21:10:47 +01002 *
3 * This program is free software; you can redistribute it and/or modify it
4 * under the terms of the GNU General Public License as published by the Free
5 * Software Foundation; either version 2 of the License, or (at your option)
6 * any later version.
7 *
8 * Author(s):
Arvid Brodin70ebe4a2014-07-04 23:34:38 +02009 * 2011-2014 Arvid Brodin, arvid.brodin@alten.se
Arvid Brodinf4214362013-10-30 21:10:47 +010010 *
11 * The HSR spec says never to forward the same frame twice on the same
12 * interface. A frame is identified by its source MAC address and its HSR
13 * sequence number. This code keeps track of senders and their sequence numbers
14 * to allow filtering of duplicate frames, and to detect HSR ring errors.
15 */
16
17#include <linux/if_ether.h>
18#include <linux/etherdevice.h>
19#include <linux/slab.h>
20#include <linux/rculist.h>
21#include "hsr_main.h"
22#include "hsr_framereg.h"
23#include "hsr_netlink.h"
24
25
Arvid Brodin70ebe4a2014-07-04 23:34:38 +020026struct hsr_node {
27 struct list_head mac_list;
28 unsigned char MacAddressA[ETH_ALEN];
29 unsigned char MacAddressB[ETH_ALEN];
Arvid Brodinc5a75912014-07-04 23:38:05 +020030 /* Local slave through which AddrB frames are received from this node */
31 enum hsr_port_type AddrB_port;
32 unsigned long time_in[HSR_PT_PORTS];
33 bool time_in_stale[HSR_PT_PORTS];
34 u16 seq_out[HSR_PT_PORTS];
Arvid Brodin70ebe4a2014-07-04 23:34:38 +020035 struct rcu_head rcu_head;
Arvid Brodinf4214362013-10-30 21:10:47 +010036};
37
Arvid Brodinf266a682014-07-04 23:41:03 +020038
Arvid Brodinf4214362013-10-30 21:10:47 +010039/* TODO: use hash lists for mac addresses (linux/jhash.h)? */
40
41
Arvid Brodinf266a682014-07-04 23:41:03 +020042/* seq_nr_after(a, b) - return true if a is after (higher in sequence than) b,
43 * false otherwise.
44 */
45static bool seq_nr_after(u16 a, u16 b)
46{
47 /* Remove inconsistency where
48 * seq_nr_after(a, b) == seq_nr_before(a, b)
49 */
50 if ((int) b - a == 32768)
51 return false;
52
53 return (((s16) (b - a)) < 0);
54}
55#define seq_nr_before(a, b) seq_nr_after((b), (a))
56#define seq_nr_after_or_eq(a, b) (!seq_nr_before((a), (b)))
57#define seq_nr_before_or_eq(a, b) (!seq_nr_after((a), (b)))
58
59
60bool hsr_addr_is_self(struct hsr_priv *hsr, unsigned char *addr)
61{
62 struct hsr_node *node;
63
64 node = list_first_or_null_rcu(&hsr->self_node_db, struct hsr_node,
65 mac_list);
66 if (!node) {
67 WARN_ONCE(1, "HSR: No self node\n");
68 return false;
69 }
70
71 if (ether_addr_equal(addr, node->MacAddressA))
72 return true;
73 if (ether_addr_equal(addr, node->MacAddressB))
74 return true;
75
76 return false;
77}
Arvid Brodinf4214362013-10-30 21:10:47 +010078
79/* Search for mac entry. Caller must hold rcu read lock.
80 */
Arvid Brodin70ebe4a2014-07-04 23:34:38 +020081static struct hsr_node *find_node_by_AddrA(struct list_head *node_db,
82 const unsigned char addr[ETH_ALEN])
Arvid Brodinf4214362013-10-30 21:10:47 +010083{
Arvid Brodin70ebe4a2014-07-04 23:34:38 +020084 struct hsr_node *node;
Arvid Brodinf4214362013-10-30 21:10:47 +010085
86 list_for_each_entry_rcu(node, node_db, mac_list) {
87 if (ether_addr_equal(node->MacAddressA, addr))
88 return node;
89 }
90
91 return NULL;
92}
93
94
Arvid Brodinf4214362013-10-30 21:10:47 +010095/* Helper for device init; the self_node_db is used in hsr_rcv() to recognize
96 * frames from self that's been looped over the HSR ring.
97 */
98int hsr_create_self_node(struct list_head *self_node_db,
99 unsigned char addr_a[ETH_ALEN],
100 unsigned char addr_b[ETH_ALEN])
101{
Arvid Brodin70ebe4a2014-07-04 23:34:38 +0200102 struct hsr_node *node, *oldnode;
Arvid Brodinf4214362013-10-30 21:10:47 +0100103
104 node = kmalloc(sizeof(*node), GFP_KERNEL);
105 if (!node)
106 return -ENOMEM;
107
Joe Perchese83abe32014-02-18 10:37:20 -0800108 ether_addr_copy(node->MacAddressA, addr_a);
109 ether_addr_copy(node->MacAddressB, addr_b);
Arvid Brodinf4214362013-10-30 21:10:47 +0100110
111 rcu_read_lock();
112 oldnode = list_first_or_null_rcu(self_node_db,
Arvid Brodin70ebe4a2014-07-04 23:34:38 +0200113 struct hsr_node, mac_list);
Arvid Brodinf4214362013-10-30 21:10:47 +0100114 if (oldnode) {
115 list_replace_rcu(&oldnode->mac_list, &node->mac_list);
116 rcu_read_unlock();
117 synchronize_rcu();
118 kfree(oldnode);
119 } else {
120 rcu_read_unlock();
121 list_add_tail_rcu(&node->mac_list, self_node_db);
122 }
123
124 return 0;
125}
126
Arvid Brodinf4214362013-10-30 21:10:47 +0100127
Arvid Brodinf266a682014-07-04 23:41:03 +0200128/* Allocate an hsr_node and add it to node_db. 'addr' is the node's AddressA;
129 * seq_out is used to initialize filtering of outgoing duplicate frames
130 * originating from the newly added node.
Arvid Brodinf4214362013-10-30 21:10:47 +0100131 */
Arvid Brodinf266a682014-07-04 23:41:03 +0200132struct hsr_node *hsr_add_node(struct list_head *node_db, unsigned char addr[],
133 u16 seq_out)
Arvid Brodinf4214362013-10-30 21:10:47 +0100134{
Arvid Brodinf266a682014-07-04 23:41:03 +0200135 struct hsr_node *node;
Arvid Brodinf4214362013-10-30 21:10:47 +0100136 unsigned long now;
Arvid Brodinf266a682014-07-04 23:41:03 +0200137 int i;
Arvid Brodinf4214362013-10-30 21:10:47 +0100138
139 node = kzalloc(sizeof(*node), GFP_ATOMIC);
140 if (!node)
141 return NULL;
142
Arvid Brodinf266a682014-07-04 23:41:03 +0200143 ether_addr_copy(node->MacAddressA, addr);
Arvid Brodinf4214362013-10-30 21:10:47 +0100144
145 /* We are only interested in time diffs here, so use current jiffies
146 * as initialization. (0 could trigger an spurious ring error warning).
147 */
148 now = jiffies;
Arvid Brodinc5a75912014-07-04 23:38:05 +0200149 for (i = 0; i < HSR_PT_PORTS; i++)
Arvid Brodinf4214362013-10-30 21:10:47 +0100150 node->time_in[i] = now;
Arvid Brodinc5a75912014-07-04 23:38:05 +0200151 for (i = 0; i < HSR_PT_PORTS; i++)
Arvid Brodinf266a682014-07-04 23:41:03 +0200152 node->seq_out[i] = seq_out;
Arvid Brodinf4214362013-10-30 21:10:47 +0100153
Arvid Brodinf266a682014-07-04 23:41:03 +0200154 list_add_tail_rcu(&node->mac_list, node_db);
Arvid Brodinf4214362013-10-30 21:10:47 +0100155
156 return node;
157}
158
Arvid Brodinf266a682014-07-04 23:41:03 +0200159/* Get the hsr_node from which 'skb' was sent.
160 */
161struct hsr_node *hsr_get_node(struct list_head *node_db, struct sk_buff *skb,
162 bool is_sup)
163{
164 struct hsr_node *node;
165 struct ethhdr *ethhdr;
166 u16 seq_out;
167
168 if (!skb_mac_header_was_set(skb))
169 return NULL;
170
171 ethhdr = (struct ethhdr *) skb_mac_header(skb);
172
173 list_for_each_entry_rcu(node, node_db, mac_list) {
174 if (ether_addr_equal(node->MacAddressA, ethhdr->h_source))
175 return node;
176 if (ether_addr_equal(node->MacAddressB, ethhdr->h_source))
177 return node;
178 }
179
180 if (!is_sup)
181 return NULL; /* Only supervision frame may create node entry */
182
183 if (ethhdr->h_proto == htons(ETH_P_PRP)) {
184 /* Use the existing sequence_nr from the tag as starting point
185 * for filtering duplicate frames.
186 */
187 seq_out = hsr_get_skb_sequence_nr(skb) - 1;
188 } else {
189 WARN_ONCE(1, "%s: Non-HSR frame\n", __func__);
190 seq_out = 0;
191 }
192
193 return hsr_add_node(node_db, ethhdr->h_source, seq_out);
194}
195
196/* Use the Supervision frame's info about an eventual MacAddressB for merging
197 * nodes that has previously had their MacAddressB registered as a separate
198 * node.
199 */
200void hsr_handle_sup_frame(struct sk_buff *skb, struct hsr_node *node_curr,
201 struct hsr_port *port_rcv)
202{
203 struct hsr_node *node_real;
204 struct hsr_sup_payload *hsr_sp;
205 struct list_head *node_db;
206 int i;
207
208 skb_pull(skb, sizeof(struct hsr_ethhdr_sp));
209 hsr_sp = (struct hsr_sup_payload *) skb->data;
210
211 if (ether_addr_equal(eth_hdr(skb)->h_source, hsr_sp->MacAddressA))
212 /* Not sent from MacAddressB of a PICS_SUBS capable node */
213 goto done;
214
215 /* Merge node_curr (registered on MacAddressB) into node_real */
216 node_db = &port_rcv->hsr->node_db;
217 node_real = find_node_by_AddrA(node_db, hsr_sp->MacAddressA);
218 if (!node_real)
219 /* No frame received from AddrA of this node yet */
220 node_real = hsr_add_node(node_db, hsr_sp->MacAddressA,
221 HSR_SEQNR_START - 1);
222 if (!node_real)
223 goto done; /* No mem */
224 if (node_real == node_curr)
225 /* Node has already been merged */
226 goto done;
227
228 ether_addr_copy(node_real->MacAddressB, eth_hdr(skb)->h_source);
229 for (i = 0; i < HSR_PT_PORTS; i++) {
230 if (!node_curr->time_in_stale[i] &&
231 time_after(node_curr->time_in[i], node_real->time_in[i])) {
232 node_real->time_in[i] = node_curr->time_in[i];
233 node_real->time_in_stale[i] = node_curr->time_in_stale[i];
234 }
235 if (seq_nr_after(node_curr->seq_out[i], node_real->seq_out[i]))
236 node_real->seq_out[i] = node_curr->seq_out[i];
237 }
238 node_real->AddrB_port = port_rcv->type;
239
240 list_del_rcu(&node_curr->mac_list);
241 kfree_rcu(node_curr, rcu_head);
242
243done:
244 skb_push(skb, sizeof(struct hsr_ethhdr_sp));
245}
246
Arvid Brodinf4214362013-10-30 21:10:47 +0100247
248/* 'skb' is a frame meant for this host, that is to be passed to upper layers.
249 *
Arvid Brodinf266a682014-07-04 23:41:03 +0200250 * If the frame was sent by a node's B interface, replace the source
Arvid Brodinf4214362013-10-30 21:10:47 +0100251 * address with that node's "official" address (MacAddressA) so that upper
252 * layers recognize where it came from.
253 */
Arvid Brodinf266a682014-07-04 23:41:03 +0200254void hsr_addr_subst_source(struct hsr_node *node, struct sk_buff *skb)
Arvid Brodinf4214362013-10-30 21:10:47 +0100255{
Arvid Brodinf4214362013-10-30 21:10:47 +0100256 if (!skb_mac_header_was_set(skb)) {
257 WARN_ONCE(1, "%s: Mac header not set\n", __func__);
258 return;
259 }
Arvid Brodinf4214362013-10-30 21:10:47 +0100260
Arvid Brodinf266a682014-07-04 23:41:03 +0200261 memcpy(&eth_hdr(skb)->h_source, node->MacAddressA, ETH_ALEN);
Arvid Brodinf4214362013-10-30 21:10:47 +0100262}
263
Arvid Brodinf4214362013-10-30 21:10:47 +0100264/* 'skb' is a frame meant for another host.
Arvid Brodinf266a682014-07-04 23:41:03 +0200265 * 'port' is the outgoing interface
Arvid Brodinf4214362013-10-30 21:10:47 +0100266 *
267 * Substitute the target (dest) MAC address if necessary, so the it matches the
268 * recipient interface MAC address, regardless of whether that is the
269 * recipient's A or B interface.
270 * This is needed to keep the packets flowing through switches that learn on
271 * which "side" the different interfaces are.
272 */
Arvid Brodinf266a682014-07-04 23:41:03 +0200273void hsr_addr_subst_dest(struct hsr_node *node_src, struct sk_buff *skb,
Arvid Brodinc5a75912014-07-04 23:38:05 +0200274 struct hsr_port *port)
Arvid Brodinf4214362013-10-30 21:10:47 +0100275{
Arvid Brodinf266a682014-07-04 23:41:03 +0200276 struct hsr_node *node_dst;
Arvid Brodinf4214362013-10-30 21:10:47 +0100277
Arvid Brodinf266a682014-07-04 23:41:03 +0200278 if (!skb_mac_header_was_set(skb)) {
279 WARN_ONCE(1, "%s: Mac header not set\n", __func__);
280 return;
281 }
282
283 if (!is_unicast_ether_addr(eth_hdr(skb)->h_dest))
284 return;
285
286 node_dst = find_node_by_AddrA(&port->hsr->node_db, eth_hdr(skb)->h_dest);
287 if (!node_dst) {
288 WARN_ONCE(1, "%s: Unknown node\n", __func__);
289 return;
290 }
291 if (port->type != node_dst->AddrB_port)
292 return;
Arvid Brodinf266a682014-07-04 23:41:03 +0200293
294 ether_addr_copy(eth_hdr(skb)->h_dest, node_dst->MacAddressB);
Arvid Brodinf4214362013-10-30 21:10:47 +0100295}
296
297
Arvid Brodinf266a682014-07-04 23:41:03 +0200298void hsr_register_frame_in(struct hsr_node *node, struct hsr_port *port,
299 u16 sequence_nr)
Arvid Brodinf4214362013-10-30 21:10:47 +0100300{
Arvid Brodinf266a682014-07-04 23:41:03 +0200301 /* Don't register incoming frames without a valid sequence number. This
302 * ensures entries of restarted nodes gets pruned so that they can
303 * re-register and resume communications.
Arvid Brodin213e3bc2013-11-29 23:37:07 +0100304 */
Arvid Brodinf266a682014-07-04 23:41:03 +0200305 if (seq_nr_before(sequence_nr, node->seq_out[port->type]))
306 return;
Arvid Brodinf4214362013-10-30 21:10:47 +0100307
Arvid Brodinc5a75912014-07-04 23:38:05 +0200308 node->time_in[port->type] = jiffies;
309 node->time_in_stale[port->type] = false;
Arvid Brodinf4214362013-10-30 21:10:47 +0100310}
311
Arvid Brodinf4214362013-10-30 21:10:47 +0100312/* 'skb' is a HSR Ethernet frame (with a HSR tag inserted), with a valid
313 * ethhdr->h_source address and skb->mac_header set.
314 *
315 * Return:
316 * 1 if frame can be shown to have been sent recently on this interface,
317 * 0 otherwise, or
318 * negative error code on error
319 */
Arvid Brodinf266a682014-07-04 23:41:03 +0200320int hsr_register_frame_out(struct hsr_port *port, struct hsr_node *node,
321 u16 sequence_nr)
Arvid Brodinf4214362013-10-30 21:10:47 +0100322{
Arvid Brodinc5a75912014-07-04 23:38:05 +0200323 if (seq_nr_before_or_eq(sequence_nr, node->seq_out[port->type]))
Arvid Brodinf4214362013-10-30 21:10:47 +0100324 return 1;
325
Arvid Brodinc5a75912014-07-04 23:38:05 +0200326 node->seq_out[port->type] = sequence_nr;
Arvid Brodinf4214362013-10-30 21:10:47 +0100327 return 0;
328}
329
330
Arvid Brodinc5a75912014-07-04 23:38:05 +0200331static struct hsr_port *get_late_port(struct hsr_priv *hsr,
332 struct hsr_node *node)
Arvid Brodinf4214362013-10-30 21:10:47 +0100333{
Arvid Brodinc5a75912014-07-04 23:38:05 +0200334 if (node->time_in_stale[HSR_PT_SLAVE_A])
335 return hsr_port_get_hsr(hsr, HSR_PT_SLAVE_A);
336 if (node->time_in_stale[HSR_PT_SLAVE_B])
337 return hsr_port_get_hsr(hsr, HSR_PT_SLAVE_B);
Arvid Brodinf4214362013-10-30 21:10:47 +0100338
Arvid Brodinc5a75912014-07-04 23:38:05 +0200339 if (time_after(node->time_in[HSR_PT_SLAVE_B],
340 node->time_in[HSR_PT_SLAVE_A] +
341 msecs_to_jiffies(MAX_SLAVE_DIFF)))
342 return hsr_port_get_hsr(hsr, HSR_PT_SLAVE_A);
343 if (time_after(node->time_in[HSR_PT_SLAVE_A],
344 node->time_in[HSR_PT_SLAVE_B] +
345 msecs_to_jiffies(MAX_SLAVE_DIFF)))
346 return hsr_port_get_hsr(hsr, HSR_PT_SLAVE_B);
Arvid Brodinf4214362013-10-30 21:10:47 +0100347
Arvid Brodinc5a75912014-07-04 23:38:05 +0200348 return NULL;
Arvid Brodinf4214362013-10-30 21:10:47 +0100349}
350
351
352/* Remove stale sequence_nr records. Called by timer every
353 * HSR_LIFE_CHECK_INTERVAL (two seconds or so).
354 */
Arvid Brodinabff7162014-07-04 23:35:47 +0200355void hsr_prune_nodes(unsigned long data)
Arvid Brodinf4214362013-10-30 21:10:47 +0100356{
Arvid Brodinabff7162014-07-04 23:35:47 +0200357 struct hsr_priv *hsr;
Arvid Brodin70ebe4a2014-07-04 23:34:38 +0200358 struct hsr_node *node;
Arvid Brodinc5a75912014-07-04 23:38:05 +0200359 struct hsr_port *port;
Arvid Brodinf4214362013-10-30 21:10:47 +0100360 unsigned long timestamp;
361 unsigned long time_a, time_b;
362
Arvid Brodinabff7162014-07-04 23:35:47 +0200363 hsr = (struct hsr_priv *) data;
364
Arvid Brodinf4214362013-10-30 21:10:47 +0100365 rcu_read_lock();
Arvid Brodin70ebe4a2014-07-04 23:34:38 +0200366 list_for_each_entry_rcu(node, &hsr->node_db, mac_list) {
Arvid Brodinf4214362013-10-30 21:10:47 +0100367 /* Shorthand */
Arvid Brodinc5a75912014-07-04 23:38:05 +0200368 time_a = node->time_in[HSR_PT_SLAVE_A];
369 time_b = node->time_in[HSR_PT_SLAVE_B];
Arvid Brodinf4214362013-10-30 21:10:47 +0100370
371 /* Check for timestamps old enough to risk wrap-around */
372 if (time_after(jiffies, time_a + MAX_JIFFY_OFFSET/2))
Arvid Brodinc5a75912014-07-04 23:38:05 +0200373 node->time_in_stale[HSR_PT_SLAVE_A] = true;
Arvid Brodinf4214362013-10-30 21:10:47 +0100374 if (time_after(jiffies, time_b + MAX_JIFFY_OFFSET/2))
Arvid Brodinc5a75912014-07-04 23:38:05 +0200375 node->time_in_stale[HSR_PT_SLAVE_B] = true;
Arvid Brodinf4214362013-10-30 21:10:47 +0100376
377 /* Get age of newest frame from node.
378 * At least one time_in is OK here; nodes get pruned long
379 * before both time_ins can get stale
380 */
381 timestamp = time_a;
Arvid Brodinc5a75912014-07-04 23:38:05 +0200382 if (node->time_in_stale[HSR_PT_SLAVE_A] ||
383 (!node->time_in_stale[HSR_PT_SLAVE_B] &&
Arvid Brodinf4214362013-10-30 21:10:47 +0100384 time_after(time_b, time_a)))
385 timestamp = time_b;
386
387 /* Warn of ring error only as long as we get frames at all */
388 if (time_is_after_jiffies(timestamp +
389 msecs_to_jiffies(1.5*MAX_SLAVE_DIFF))) {
Arvid Brodinc5a75912014-07-04 23:38:05 +0200390 rcu_read_lock();
391 port = get_late_port(hsr, node);
392 if (port != NULL)
393 hsr_nl_ringerror(hsr, node->MacAddressA, port);
394 rcu_read_unlock();
Arvid Brodinf4214362013-10-30 21:10:47 +0100395 }
396
397 /* Prune old entries */
398 if (time_is_before_jiffies(timestamp +
399 msecs_to_jiffies(HSR_NODE_FORGET_TIME))) {
Arvid Brodin70ebe4a2014-07-04 23:34:38 +0200400 hsr_nl_nodedown(hsr, node->MacAddressA);
Arvid Brodinf4214362013-10-30 21:10:47 +0100401 list_del_rcu(&node->mac_list);
402 /* Note that we need to free this entry later: */
Wei Yongjun1aee6cc2013-12-16 14:05:50 +0800403 kfree_rcu(node, rcu_head);
Arvid Brodinf4214362013-10-30 21:10:47 +0100404 }
405 }
406 rcu_read_unlock();
407}
408
409
Arvid Brodin70ebe4a2014-07-04 23:34:38 +0200410void *hsr_get_next_node(struct hsr_priv *hsr, void *_pos,
Arvid Brodinf4214362013-10-30 21:10:47 +0100411 unsigned char addr[ETH_ALEN])
412{
Arvid Brodin70ebe4a2014-07-04 23:34:38 +0200413 struct hsr_node *node;
Arvid Brodinf4214362013-10-30 21:10:47 +0100414
415 if (!_pos) {
Arvid Brodin70ebe4a2014-07-04 23:34:38 +0200416 node = list_first_or_null_rcu(&hsr->node_db,
417 struct hsr_node, mac_list);
Arvid Brodinf4214362013-10-30 21:10:47 +0100418 if (node)
Joe Perchese83abe32014-02-18 10:37:20 -0800419 ether_addr_copy(addr, node->MacAddressA);
Arvid Brodinf4214362013-10-30 21:10:47 +0100420 return node;
421 }
422
423 node = _pos;
Arvid Brodin70ebe4a2014-07-04 23:34:38 +0200424 list_for_each_entry_continue_rcu(node, &hsr->node_db, mac_list) {
Joe Perchese83abe32014-02-18 10:37:20 -0800425 ether_addr_copy(addr, node->MacAddressA);
Arvid Brodinf4214362013-10-30 21:10:47 +0100426 return node;
427 }
428
429 return NULL;
430}
431
432
Arvid Brodin70ebe4a2014-07-04 23:34:38 +0200433int hsr_get_node_data(struct hsr_priv *hsr,
Arvid Brodinf4214362013-10-30 21:10:47 +0100434 const unsigned char *addr,
435 unsigned char addr_b[ETH_ALEN],
436 unsigned int *addr_b_ifindex,
437 int *if1_age,
438 u16 *if1_seq,
439 int *if2_age,
440 u16 *if2_seq)
441{
Arvid Brodin70ebe4a2014-07-04 23:34:38 +0200442 struct hsr_node *node;
Arvid Brodinc5a75912014-07-04 23:38:05 +0200443 struct hsr_port *port;
Arvid Brodinf4214362013-10-30 21:10:47 +0100444 unsigned long tdiff;
445
446
447 rcu_read_lock();
Arvid Brodin70ebe4a2014-07-04 23:34:38 +0200448 node = find_node_by_AddrA(&hsr->node_db, addr);
Arvid Brodinf4214362013-10-30 21:10:47 +0100449 if (!node) {
450 rcu_read_unlock();
451 return -ENOENT; /* No such entry */
452 }
453
Joe Perchese83abe32014-02-18 10:37:20 -0800454 ether_addr_copy(addr_b, node->MacAddressB);
Arvid Brodinf4214362013-10-30 21:10:47 +0100455
Arvid Brodinc5a75912014-07-04 23:38:05 +0200456 tdiff = jiffies - node->time_in[HSR_PT_SLAVE_A];
457 if (node->time_in_stale[HSR_PT_SLAVE_A])
Arvid Brodinf4214362013-10-30 21:10:47 +0100458 *if1_age = INT_MAX;
459#if HZ <= MSEC_PER_SEC
460 else if (tdiff > msecs_to_jiffies(INT_MAX))
461 *if1_age = INT_MAX;
462#endif
463 else
464 *if1_age = jiffies_to_msecs(tdiff);
465
Arvid Brodinc5a75912014-07-04 23:38:05 +0200466 tdiff = jiffies - node->time_in[HSR_PT_SLAVE_B];
467 if (node->time_in_stale[HSR_PT_SLAVE_B])
Arvid Brodinf4214362013-10-30 21:10:47 +0100468 *if2_age = INT_MAX;
469#if HZ <= MSEC_PER_SEC
470 else if (tdiff > msecs_to_jiffies(INT_MAX))
471 *if2_age = INT_MAX;
472#endif
473 else
474 *if2_age = jiffies_to_msecs(tdiff);
475
476 /* Present sequence numbers as if they were incoming on interface */
Arvid Brodinc5a75912014-07-04 23:38:05 +0200477 *if1_seq = node->seq_out[HSR_PT_SLAVE_B];
478 *if2_seq = node->seq_out[HSR_PT_SLAVE_A];
Arvid Brodinf4214362013-10-30 21:10:47 +0100479
Arvid Brodinc5a75912014-07-04 23:38:05 +0200480 if (node->AddrB_port != HSR_PT_NONE) {
481 port = hsr_port_get_hsr(hsr, node->AddrB_port);
482 *addr_b_ifindex = port->dev->ifindex;
483 } else {
Arvid Brodinf4214362013-10-30 21:10:47 +0100484 *addr_b_ifindex = -1;
Arvid Brodinc5a75912014-07-04 23:38:05 +0200485 }
Arvid Brodinf4214362013-10-30 21:10:47 +0100486
487 rcu_read_unlock();
488
489 return 0;
490}