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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
26struct hsr_node {
27 struct list_head mac_list;
28 unsigned char MacAddressA[ETH_ALEN];
29 unsigned char MacAddressB[ETH_ALEN];
30
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];
35 struct rcu_head rcu_head;
36};
37
38
39
40
41
42
43
44
45static bool seq_nr_after(u16 a, u16 b)
46{
47
48
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}
78
79
80
81static struct hsr_node *find_node_by_AddrA(struct list_head *node_db,
82 const unsigned char addr[ETH_ALEN])
83{
84 struct hsr_node *node;
85
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
95
96
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{
102 struct hsr_node *node, *oldnode;
103
104 node = kmalloc(sizeof(*node), GFP_KERNEL);
105 if (!node)
106 return -ENOMEM;
107
108 ether_addr_copy(node->MacAddressA, addr_a);
109 ether_addr_copy(node->MacAddressB, addr_b);
110
111 rcu_read_lock();
112 oldnode = list_first_or_null_rcu(self_node_db,
113 struct hsr_node, mac_list);
114 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
127
128
129
130
131
132struct hsr_node *hsr_add_node(struct list_head *node_db, unsigned char addr[],
133 u16 seq_out)
134{
135 struct hsr_node *node;
136 unsigned long now;
137 int i;
138
139 node = kzalloc(sizeof(*node), GFP_ATOMIC);
140 if (!node)
141 return NULL;
142
143 ether_addr_copy(node->MacAddressA, addr);
144
145
146
147
148 now = jiffies;
149 for (i = 0; i < HSR_PT_PORTS; i++)
150 node->time_in[i] = now;
151 for (i = 0; i < HSR_PT_PORTS; i++)
152 node->seq_out[i] = seq_out;
153
154 list_add_tail_rcu(&node->mac_list, node_db);
155
156 return node;
157}
158
159
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
181
182 if (ethhdr->h_proto == htons(ETH_P_PRP)
183 || ethhdr->h_proto == htons(ETH_P_HSR)) {
184
185
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 = HSR_SEQNR_START;
191 }
192
193 return hsr_add_node(node_db, ethhdr->h_source, seq_out);
194}
195
196
197
198
199
200void hsr_handle_sup_frame(struct sk_buff *skb, struct hsr_node *node_curr,
201 struct hsr_port *port_rcv)
202{
203 struct ethhdr *ethhdr;
204 struct hsr_node *node_real;
205 struct hsr_sup_payload *hsr_sp;
206 struct list_head *node_db;
207 int i;
208
209 ethhdr = (struct ethhdr *) skb_mac_header(skb);
210
211
212 skb_pull(skb, sizeof(struct ethhdr));
213
214
215 if (ethhdr->h_proto == htons(ETH_P_HSR))
216 skb_pull(skb, sizeof(struct hsr_tag));
217
218
219 skb_pull(skb, sizeof(struct hsr_sup_tag));
220
221 hsr_sp = (struct hsr_sup_payload *) skb->data;
222
223
224 node_db = &port_rcv->hsr->node_db;
225 node_real = find_node_by_AddrA(node_db, hsr_sp->MacAddressA);
226 if (!node_real)
227
228 node_real = hsr_add_node(node_db, hsr_sp->MacAddressA,
229 HSR_SEQNR_START - 1);
230 if (!node_real)
231 goto done;
232 if (node_real == node_curr)
233
234 goto done;
235
236 ether_addr_copy(node_real->MacAddressB, ethhdr->h_source);
237 for (i = 0; i < HSR_PT_PORTS; i++) {
238 if (!node_curr->time_in_stale[i] &&
239 time_after(node_curr->time_in[i], node_real->time_in[i])) {
240 node_real->time_in[i] = node_curr->time_in[i];
241 node_real->time_in_stale[i] = node_curr->time_in_stale[i];
242 }
243 if (seq_nr_after(node_curr->seq_out[i], node_real->seq_out[i]))
244 node_real->seq_out[i] = node_curr->seq_out[i];
245 }
246 node_real->AddrB_port = port_rcv->type;
247
248 list_del_rcu(&node_curr->mac_list);
249 kfree_rcu(node_curr, rcu_head);
250
251done:
252 skb_push(skb, sizeof(struct hsrv1_ethhdr_sp));
253}
254
255
256
257
258
259
260
261
262void hsr_addr_subst_source(struct hsr_node *node, struct sk_buff *skb)
263{
264 if (!skb_mac_header_was_set(skb)) {
265 WARN_ONCE(1, "%s: Mac header not set\n", __func__);
266 return;
267 }
268
269 memcpy(ð_hdr(skb)->h_source, node->MacAddressA, ETH_ALEN);
270}
271
272
273
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275
276
277
278
279
280
281void hsr_addr_subst_dest(struct hsr_node *node_src, struct sk_buff *skb,
282 struct hsr_port *port)
283{
284 struct hsr_node *node_dst;
285
286 if (!skb_mac_header_was_set(skb)) {
287 WARN_ONCE(1, "%s: Mac header not set\n", __func__);
288 return;
289 }
290
291 if (!is_unicast_ether_addr(eth_hdr(skb)->h_dest))
292 return;
293
294 node_dst = find_node_by_AddrA(&port->hsr->node_db, eth_hdr(skb)->h_dest);
295 if (!node_dst) {
296 WARN_ONCE(1, "%s: Unknown node\n", __func__);
297 return;
298 }
299 if (port->type != node_dst->AddrB_port)
300 return;
301
302 ether_addr_copy(eth_hdr(skb)->h_dest, node_dst->MacAddressB);
303}
304
305
306void hsr_register_frame_in(struct hsr_node *node, struct hsr_port *port,
307 u16 sequence_nr)
308{
309
310
311
312
313 if (seq_nr_before(sequence_nr, node->seq_out[port->type]))
314 return;
315
316 node->time_in[port->type] = jiffies;
317 node->time_in_stale[port->type] = false;
318}
319
320
321
322
323
324
325
326
327
328int hsr_register_frame_out(struct hsr_port *port, struct hsr_node *node,
329 u16 sequence_nr)
330{
331 if (seq_nr_before_or_eq(sequence_nr, node->seq_out[port->type]))
332 return 1;
333
334 node->seq_out[port->type] = sequence_nr;
335 return 0;
336}
337
338
339static struct hsr_port *get_late_port(struct hsr_priv *hsr,
340 struct hsr_node *node)
341{
342 if (node->time_in_stale[HSR_PT_SLAVE_A])
343 return hsr_port_get_hsr(hsr, HSR_PT_SLAVE_A);
344 if (node->time_in_stale[HSR_PT_SLAVE_B])
345 return hsr_port_get_hsr(hsr, HSR_PT_SLAVE_B);
346
347 if (time_after(node->time_in[HSR_PT_SLAVE_B],
348 node->time_in[HSR_PT_SLAVE_A] +
349 msecs_to_jiffies(MAX_SLAVE_DIFF)))
350 return hsr_port_get_hsr(hsr, HSR_PT_SLAVE_A);
351 if (time_after(node->time_in[HSR_PT_SLAVE_A],
352 node->time_in[HSR_PT_SLAVE_B] +
353 msecs_to_jiffies(MAX_SLAVE_DIFF)))
354 return hsr_port_get_hsr(hsr, HSR_PT_SLAVE_B);
355
356 return NULL;
357}
358
359
360
361
362
363void hsr_prune_nodes(unsigned long data)
364{
365 struct hsr_priv *hsr;
366 struct hsr_node *node;
367 struct hsr_port *port;
368 unsigned long timestamp;
369 unsigned long time_a, time_b;
370
371 hsr = (struct hsr_priv *) data;
372
373 rcu_read_lock();
374 list_for_each_entry_rcu(node, &hsr->node_db, mac_list) {
375
376 time_a = node->time_in[HSR_PT_SLAVE_A];
377 time_b = node->time_in[HSR_PT_SLAVE_B];
378
379
380 if (time_after(jiffies, time_a + MAX_JIFFY_OFFSET/2))
381 node->time_in_stale[HSR_PT_SLAVE_A] = true;
382 if (time_after(jiffies, time_b + MAX_JIFFY_OFFSET/2))
383 node->time_in_stale[HSR_PT_SLAVE_B] = true;
384
385
386
387
388
389 timestamp = time_a;
390 if (node->time_in_stale[HSR_PT_SLAVE_A] ||
391 (!node->time_in_stale[HSR_PT_SLAVE_B] &&
392 time_after(time_b, time_a)))
393 timestamp = time_b;
394
395
396 if (time_is_after_jiffies(timestamp +
397 msecs_to_jiffies(1.5*MAX_SLAVE_DIFF))) {
398 rcu_read_lock();
399 port = get_late_port(hsr, node);
400 if (port != NULL)
401 hsr_nl_ringerror(hsr, node->MacAddressA, port);
402 rcu_read_unlock();
403 }
404
405
406 if (time_is_before_jiffies(timestamp +
407 msecs_to_jiffies(HSR_NODE_FORGET_TIME))) {
408 hsr_nl_nodedown(hsr, node->MacAddressA);
409 list_del_rcu(&node->mac_list);
410
411 kfree_rcu(node, rcu_head);
412 }
413 }
414 rcu_read_unlock();
415}
416
417
418void *hsr_get_next_node(struct hsr_priv *hsr, void *_pos,
419 unsigned char addr[ETH_ALEN])
420{
421 struct hsr_node *node;
422
423 if (!_pos) {
424 node = list_first_or_null_rcu(&hsr->node_db,
425 struct hsr_node, mac_list);
426 if (node)
427 ether_addr_copy(addr, node->MacAddressA);
428 return node;
429 }
430
431 node = _pos;
432 list_for_each_entry_continue_rcu(node, &hsr->node_db, mac_list) {
433 ether_addr_copy(addr, node->MacAddressA);
434 return node;
435 }
436
437 return NULL;
438}
439
440
441int hsr_get_node_data(struct hsr_priv *hsr,
442 const unsigned char *addr,
443 unsigned char addr_b[ETH_ALEN],
444 unsigned int *addr_b_ifindex,
445 int *if1_age,
446 u16 *if1_seq,
447 int *if2_age,
448 u16 *if2_seq)
449{
450 struct hsr_node *node;
451 struct hsr_port *port;
452 unsigned long tdiff;
453
454
455 rcu_read_lock();
456 node = find_node_by_AddrA(&hsr->node_db, addr);
457 if (!node) {
458 rcu_read_unlock();
459 return -ENOENT;
460 }
461
462 ether_addr_copy(addr_b, node->MacAddressB);
463
464 tdiff = jiffies - node->time_in[HSR_PT_SLAVE_A];
465 if (node->time_in_stale[HSR_PT_SLAVE_A])
466 *if1_age = INT_MAX;
467#if HZ <= MSEC_PER_SEC
468 else if (tdiff > msecs_to_jiffies(INT_MAX))
469 *if1_age = INT_MAX;
470#endif
471 else
472 *if1_age = jiffies_to_msecs(tdiff);
473
474 tdiff = jiffies - node->time_in[HSR_PT_SLAVE_B];
475 if (node->time_in_stale[HSR_PT_SLAVE_B])
476 *if2_age = INT_MAX;
477#if HZ <= MSEC_PER_SEC
478 else if (tdiff > msecs_to_jiffies(INT_MAX))
479 *if2_age = INT_MAX;
480#endif
481 else
482 *if2_age = jiffies_to_msecs(tdiff);
483
484
485 *if1_seq = node->seq_out[HSR_PT_SLAVE_B];
486 *if2_seq = node->seq_out[HSR_PT_SLAVE_A];
487
488 if (node->AddrB_port != HSR_PT_NONE) {
489 port = hsr_port_get_hsr(hsr, node->AddrB_port);
490 *addr_b_ifindex = port->dev->ifindex;
491 } else {
492 *addr_b_ifindex = -1;
493 }
494
495 rcu_read_unlock();
496
497 return 0;
498}
499