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9a9f26e8 HV |
1 | // SPDX-License-Identifier: GPL-2.0-or-later |
2 | ||
3 | #include <linux/mrp_bridge.h> | |
4 | #include "br_private_mrp.h" | |
5 | ||
6 | static const u8 mrp_test_dmac[ETH_ALEN] = { 0x1, 0x15, 0x4e, 0x0, 0x0, 0x1 }; | |
7 | ||
8 | static struct net_bridge_port *br_mrp_get_port(struct net_bridge *br, | |
9 | u32 ifindex) | |
10 | { | |
11 | struct net_bridge_port *res = NULL; | |
12 | struct net_bridge_port *port; | |
13 | ||
14 | list_for_each_entry(port, &br->port_list, list) { | |
15 | if (port->dev->ifindex == ifindex) { | |
16 | res = port; | |
17 | break; | |
18 | } | |
19 | } | |
20 | ||
21 | return res; | |
22 | } | |
23 | ||
24 | static struct br_mrp *br_mrp_find_id(struct net_bridge *br, u32 ring_id) | |
25 | { | |
26 | struct br_mrp *res = NULL; | |
27 | struct br_mrp *mrp; | |
28 | ||
29 | list_for_each_entry_rcu(mrp, &br->mrp_list, list, | |
30 | lockdep_rtnl_is_held()) { | |
31 | if (mrp->ring_id == ring_id) { | |
32 | res = mrp; | |
33 | break; | |
34 | } | |
35 | } | |
36 | ||
37 | return res; | |
38 | } | |
39 | ||
7aa38018 HV |
40 | static bool br_mrp_unique_ifindex(struct net_bridge *br, u32 ifindex) |
41 | { | |
42 | struct br_mrp *mrp; | |
43 | ||
44 | list_for_each_entry_rcu(mrp, &br->mrp_list, list, | |
45 | lockdep_rtnl_is_held()) { | |
46 | struct net_bridge_port *p; | |
47 | ||
48 | p = rtnl_dereference(mrp->p_port); | |
49 | if (p && p->dev->ifindex == ifindex) | |
50 | return false; | |
51 | ||
52 | p = rtnl_dereference(mrp->s_port); | |
53 | if (p && p->dev->ifindex == ifindex) | |
54 | return false; | |
55 | } | |
56 | ||
57 | return true; | |
58 | } | |
59 | ||
9a9f26e8 HV |
60 | static struct br_mrp *br_mrp_find_port(struct net_bridge *br, |
61 | struct net_bridge_port *p) | |
62 | { | |
63 | struct br_mrp *res = NULL; | |
64 | struct br_mrp *mrp; | |
65 | ||
66 | list_for_each_entry_rcu(mrp, &br->mrp_list, list, | |
67 | lockdep_rtnl_is_held()) { | |
68 | if (rcu_access_pointer(mrp->p_port) == p || | |
69 | rcu_access_pointer(mrp->s_port) == p) { | |
70 | res = mrp; | |
71 | break; | |
72 | } | |
73 | } | |
74 | ||
75 | return res; | |
76 | } | |
77 | ||
78 | static int br_mrp_next_seq(struct br_mrp *mrp) | |
79 | { | |
80 | mrp->seq_id++; | |
81 | return mrp->seq_id; | |
82 | } | |
83 | ||
84 | static struct sk_buff *br_mrp_skb_alloc(struct net_bridge_port *p, | |
85 | const u8 *src, const u8 *dst) | |
86 | { | |
87 | struct ethhdr *eth_hdr; | |
88 | struct sk_buff *skb; | |
9b14d1f8 | 89 | __be16 *version; |
9a9f26e8 HV |
90 | |
91 | skb = dev_alloc_skb(MRP_MAX_FRAME_LENGTH); | |
92 | if (!skb) | |
93 | return NULL; | |
94 | ||
95 | skb->dev = p->dev; | |
96 | skb->protocol = htons(ETH_P_MRP); | |
97 | skb->priority = MRP_FRAME_PRIO; | |
98 | skb_reserve(skb, sizeof(*eth_hdr)); | |
99 | ||
100 | eth_hdr = skb_push(skb, sizeof(*eth_hdr)); | |
101 | ether_addr_copy(eth_hdr->h_dest, dst); | |
102 | ether_addr_copy(eth_hdr->h_source, src); | |
103 | eth_hdr->h_proto = htons(ETH_P_MRP); | |
104 | ||
105 | version = skb_put(skb, sizeof(*version)); | |
106 | *version = cpu_to_be16(MRP_VERSION); | |
107 | ||
108 | return skb; | |
109 | } | |
110 | ||
111 | static void br_mrp_skb_tlv(struct sk_buff *skb, | |
112 | enum br_mrp_tlv_header_type type, | |
113 | u8 length) | |
114 | { | |
115 | struct br_mrp_tlv_hdr *hdr; | |
116 | ||
117 | hdr = skb_put(skb, sizeof(*hdr)); | |
118 | hdr->type = type; | |
119 | hdr->length = length; | |
120 | } | |
121 | ||
122 | static void br_mrp_skb_common(struct sk_buff *skb, struct br_mrp *mrp) | |
123 | { | |
124 | struct br_mrp_common_hdr *hdr; | |
125 | ||
126 | br_mrp_skb_tlv(skb, BR_MRP_TLV_HEADER_COMMON, sizeof(*hdr)); | |
127 | ||
128 | hdr = skb_put(skb, sizeof(*hdr)); | |
129 | hdr->seq_id = cpu_to_be16(br_mrp_next_seq(mrp)); | |
130 | memset(hdr->domain, 0xff, MRP_DOMAIN_UUID_LENGTH); | |
131 | } | |
132 | ||
133 | static struct sk_buff *br_mrp_alloc_test_skb(struct br_mrp *mrp, | |
134 | struct net_bridge_port *p, | |
135 | enum br_mrp_port_role_type port_role) | |
136 | { | |
137 | struct br_mrp_ring_test_hdr *hdr = NULL; | |
138 | struct sk_buff *skb = NULL; | |
139 | ||
140 | if (!p) | |
141 | return NULL; | |
142 | ||
143 | skb = br_mrp_skb_alloc(p, p->dev->dev_addr, mrp_test_dmac); | |
144 | if (!skb) | |
145 | return NULL; | |
146 | ||
147 | br_mrp_skb_tlv(skb, BR_MRP_TLV_HEADER_RING_TEST, sizeof(*hdr)); | |
148 | hdr = skb_put(skb, sizeof(*hdr)); | |
149 | ||
4b3a61b0 | 150 | hdr->prio = cpu_to_be16(mrp->prio); |
9a9f26e8 HV |
151 | ether_addr_copy(hdr->sa, p->br->dev->dev_addr); |
152 | hdr->port_role = cpu_to_be16(port_role); | |
153 | hdr->state = cpu_to_be16(mrp->ring_state); | |
154 | hdr->transitions = cpu_to_be16(mrp->ring_transitions); | |
155 | hdr->timestamp = cpu_to_be32(jiffies_to_msecs(jiffies)); | |
156 | ||
157 | br_mrp_skb_common(skb, mrp); | |
158 | br_mrp_skb_tlv(skb, BR_MRP_TLV_HEADER_END, 0x0); | |
159 | ||
160 | return skb; | |
161 | } | |
162 | ||
c6676e7d HV |
163 | /* This function is continuously called in the following cases: |
164 | * - when node role is MRM, in this case test_monitor is always set to false | |
165 | * because it needs to notify the userspace that the ring is open and needs to | |
166 | * send MRP_Test frames | |
167 | * - when node role is MRA, there are 2 subcases: | |
168 | * - when MRA behaves as MRM, in this case is similar with MRM role | |
169 | * - when MRA behaves as MRC, in this case test_monitor is set to true, | |
170 | * because it needs to detect when it stops seeing MRP_Test frames | |
171 | * from MRM node but it doesn't need to send MRP_Test frames. | |
172 | */ | |
9a9f26e8 HV |
173 | static void br_mrp_test_work_expired(struct work_struct *work) |
174 | { | |
175 | struct delayed_work *del_work = to_delayed_work(work); | |
176 | struct br_mrp *mrp = container_of(del_work, struct br_mrp, test_work); | |
177 | struct net_bridge_port *p; | |
178 | bool notify_open = false; | |
179 | struct sk_buff *skb; | |
180 | ||
181 | if (time_before_eq(mrp->test_end, jiffies)) | |
182 | return; | |
183 | ||
184 | if (mrp->test_count_miss < mrp->test_max_miss) { | |
185 | mrp->test_count_miss++; | |
186 | } else { | |
187 | /* Notify that the ring is open only if the ring state is | |
188 | * closed, otherwise it would continue to notify at every | |
189 | * interval. | |
c6676e7d HV |
190 | * Also notify that the ring is open when the node has the |
191 | * role MRA and behaves as MRC. The reason is that the | |
192 | * userspace needs to know when the MRM stopped sending | |
193 | * MRP_Test frames so that the current node to try to take | |
194 | * the role of a MRM. | |
9a9f26e8 | 195 | */ |
c6676e7d HV |
196 | if (mrp->ring_state == BR_MRP_RING_STATE_CLOSED || |
197 | mrp->test_monitor) | |
9a9f26e8 HV |
198 | notify_open = true; |
199 | } | |
200 | ||
201 | rcu_read_lock(); | |
202 | ||
203 | p = rcu_dereference(mrp->p_port); | |
204 | if (p) { | |
c6676e7d HV |
205 | if (!mrp->test_monitor) { |
206 | skb = br_mrp_alloc_test_skb(mrp, p, | |
207 | BR_MRP_PORT_ROLE_PRIMARY); | |
208 | if (!skb) | |
209 | goto out; | |
210 | ||
211 | skb_reset_network_header(skb); | |
212 | dev_queue_xmit(skb); | |
213 | } | |
9a9f26e8 HV |
214 | |
215 | if (notify_open && !mrp->ring_role_offloaded) | |
216 | br_mrp_port_open(p->dev, true); | |
217 | } | |
218 | ||
219 | p = rcu_dereference(mrp->s_port); | |
220 | if (p) { | |
c6676e7d HV |
221 | if (!mrp->test_monitor) { |
222 | skb = br_mrp_alloc_test_skb(mrp, p, | |
223 | BR_MRP_PORT_ROLE_SECONDARY); | |
224 | if (!skb) | |
225 | goto out; | |
226 | ||
227 | skb_reset_network_header(skb); | |
228 | dev_queue_xmit(skb); | |
229 | } | |
9a9f26e8 HV |
230 | |
231 | if (notify_open && !mrp->ring_role_offloaded) | |
232 | br_mrp_port_open(p->dev, true); | |
233 | } | |
234 | ||
235 | out: | |
236 | rcu_read_unlock(); | |
237 | ||
238 | queue_delayed_work(system_wq, &mrp->test_work, | |
239 | usecs_to_jiffies(mrp->test_interval)); | |
240 | } | |
241 | ||
242 | /* Deletes the MRP instance. | |
243 | * note: called under rtnl_lock | |
244 | */ | |
245 | static void br_mrp_del_impl(struct net_bridge *br, struct br_mrp *mrp) | |
246 | { | |
247 | struct net_bridge_port *p; | |
4fb13499 | 248 | u8 state; |
9a9f26e8 HV |
249 | |
250 | /* Stop sending MRP_Test frames */ | |
251 | cancel_delayed_work_sync(&mrp->test_work); | |
c6676e7d | 252 | br_mrp_switchdev_send_ring_test(br, mrp, 0, 0, 0, 0); |
9a9f26e8 HV |
253 | |
254 | br_mrp_switchdev_del(br, mrp); | |
255 | ||
256 | /* Reset the ports */ | |
257 | p = rtnl_dereference(mrp->p_port); | |
258 | if (p) { | |
259 | spin_lock_bh(&br->lock); | |
4fb13499 HV |
260 | state = netif_running(br->dev) ? |
261 | BR_STATE_FORWARDING : BR_STATE_DISABLED; | |
262 | p->state = state; | |
9a9f26e8 HV |
263 | p->flags &= ~BR_MRP_AWARE; |
264 | spin_unlock_bh(&br->lock); | |
4fb13499 | 265 | br_mrp_port_switchdev_set_state(p, state); |
9a9f26e8 HV |
266 | rcu_assign_pointer(mrp->p_port, NULL); |
267 | } | |
268 | ||
269 | p = rtnl_dereference(mrp->s_port); | |
270 | if (p) { | |
271 | spin_lock_bh(&br->lock); | |
4fb13499 HV |
272 | state = netif_running(br->dev) ? |
273 | BR_STATE_FORWARDING : BR_STATE_DISABLED; | |
274 | p->state = state; | |
9a9f26e8 HV |
275 | p->flags &= ~BR_MRP_AWARE; |
276 | spin_unlock_bh(&br->lock); | |
4fb13499 | 277 | br_mrp_port_switchdev_set_state(p, state); |
9a9f26e8 HV |
278 | rcu_assign_pointer(mrp->s_port, NULL); |
279 | } | |
280 | ||
281 | list_del_rcu(&mrp->list); | |
282 | kfree_rcu(mrp, rcu); | |
283 | } | |
284 | ||
285 | /* Adds a new MRP instance. | |
286 | * note: called under rtnl_lock | |
287 | */ | |
288 | int br_mrp_add(struct net_bridge *br, struct br_mrp_instance *instance) | |
289 | { | |
290 | struct net_bridge_port *p; | |
291 | struct br_mrp *mrp; | |
292 | int err; | |
293 | ||
294 | /* If the ring exists, it is not possible to create another one with the | |
295 | * same ring_id | |
296 | */ | |
297 | mrp = br_mrp_find_id(br, instance->ring_id); | |
298 | if (mrp) | |
299 | return -EINVAL; | |
300 | ||
301 | if (!br_mrp_get_port(br, instance->p_ifindex) || | |
302 | !br_mrp_get_port(br, instance->s_ifindex)) | |
303 | return -EINVAL; | |
304 | ||
7aa38018 HV |
305 | /* It is not possible to have the same port part of multiple rings */ |
306 | if (!br_mrp_unique_ifindex(br, instance->p_ifindex) || | |
307 | !br_mrp_unique_ifindex(br, instance->s_ifindex)) | |
308 | return -EINVAL; | |
309 | ||
9a9f26e8 HV |
310 | mrp = kzalloc(sizeof(*mrp), GFP_KERNEL); |
311 | if (!mrp) | |
312 | return -ENOMEM; | |
313 | ||
314 | mrp->ring_id = instance->ring_id; | |
4b3a61b0 | 315 | mrp->prio = instance->prio; |
9a9f26e8 HV |
316 | |
317 | p = br_mrp_get_port(br, instance->p_ifindex); | |
318 | spin_lock_bh(&br->lock); | |
319 | p->state = BR_STATE_FORWARDING; | |
320 | p->flags |= BR_MRP_AWARE; | |
321 | spin_unlock_bh(&br->lock); | |
322 | rcu_assign_pointer(mrp->p_port, p); | |
323 | ||
324 | p = br_mrp_get_port(br, instance->s_ifindex); | |
325 | spin_lock_bh(&br->lock); | |
326 | p->state = BR_STATE_FORWARDING; | |
327 | p->flags |= BR_MRP_AWARE; | |
328 | spin_unlock_bh(&br->lock); | |
329 | rcu_assign_pointer(mrp->s_port, p); | |
330 | ||
331 | INIT_DELAYED_WORK(&mrp->test_work, br_mrp_test_work_expired); | |
332 | list_add_tail_rcu(&mrp->list, &br->mrp_list); | |
333 | ||
334 | err = br_mrp_switchdev_add(br, mrp); | |
335 | if (err) | |
336 | goto delete_mrp; | |
337 | ||
338 | return 0; | |
339 | ||
340 | delete_mrp: | |
341 | br_mrp_del_impl(br, mrp); | |
342 | ||
343 | return err; | |
344 | } | |
345 | ||
346 | /* Deletes the MRP instance from which the port is part of | |
347 | * note: called under rtnl_lock | |
348 | */ | |
349 | void br_mrp_port_del(struct net_bridge *br, struct net_bridge_port *p) | |
350 | { | |
351 | struct br_mrp *mrp = br_mrp_find_port(br, p); | |
352 | ||
353 | /* If the port is not part of a MRP instance just bail out */ | |
354 | if (!mrp) | |
355 | return; | |
356 | ||
357 | br_mrp_del_impl(br, mrp); | |
358 | } | |
359 | ||
360 | /* Deletes existing MRP instance based on ring_id | |
361 | * note: called under rtnl_lock | |
362 | */ | |
363 | int br_mrp_del(struct net_bridge *br, struct br_mrp_instance *instance) | |
364 | { | |
365 | struct br_mrp *mrp = br_mrp_find_id(br, instance->ring_id); | |
366 | ||
367 | if (!mrp) | |
368 | return -EINVAL; | |
369 | ||
370 | br_mrp_del_impl(br, mrp); | |
371 | ||
372 | return 0; | |
373 | } | |
374 | ||
375 | /* Set port state, port state can be forwarding, blocked or disabled | |
376 | * note: already called with rtnl_lock | |
377 | */ | |
378 | int br_mrp_set_port_state(struct net_bridge_port *p, | |
379 | enum br_mrp_port_state_type state) | |
380 | { | |
381 | if (!p || !(p->flags & BR_MRP_AWARE)) | |
382 | return -EINVAL; | |
383 | ||
384 | spin_lock_bh(&p->br->lock); | |
385 | ||
386 | if (state == BR_MRP_PORT_STATE_FORWARDING) | |
387 | p->state = BR_STATE_FORWARDING; | |
388 | else | |
389 | p->state = BR_STATE_BLOCKING; | |
390 | ||
391 | spin_unlock_bh(&p->br->lock); | |
392 | ||
393 | br_mrp_port_switchdev_set_state(p, state); | |
394 | ||
395 | return 0; | |
396 | } | |
397 | ||
398 | /* Set port role, port role can be primary or secondary | |
399 | * note: already called with rtnl_lock | |
400 | */ | |
401 | int br_mrp_set_port_role(struct net_bridge_port *p, | |
20f6a05e | 402 | enum br_mrp_port_role_type role) |
9a9f26e8 HV |
403 | { |
404 | struct br_mrp *mrp; | |
405 | ||
406 | if (!p || !(p->flags & BR_MRP_AWARE)) | |
407 | return -EINVAL; | |
408 | ||
20f6a05e | 409 | mrp = br_mrp_find_port(p->br, p); |
9a9f26e8 HV |
410 | |
411 | if (!mrp) | |
412 | return -EINVAL; | |
413 | ||
7882c895 HV |
414 | switch (role) { |
415 | case BR_MRP_PORT_ROLE_PRIMARY: | |
9a9f26e8 | 416 | rcu_assign_pointer(mrp->p_port, p); |
7882c895 HV |
417 | break; |
418 | case BR_MRP_PORT_ROLE_SECONDARY: | |
9a9f26e8 | 419 | rcu_assign_pointer(mrp->s_port, p); |
7882c895 HV |
420 | break; |
421 | default: | |
422 | return -EINVAL; | |
423 | } | |
9a9f26e8 | 424 | |
20f6a05e | 425 | br_mrp_port_switchdev_set_role(p, role); |
9a9f26e8 HV |
426 | |
427 | return 0; | |
428 | } | |
429 | ||
430 | /* Set ring state, ring state can be only Open or Closed | |
431 | * note: already called with rtnl_lock | |
432 | */ | |
433 | int br_mrp_set_ring_state(struct net_bridge *br, | |
434 | struct br_mrp_ring_state *state) | |
435 | { | |
436 | struct br_mrp *mrp = br_mrp_find_id(br, state->ring_id); | |
437 | ||
438 | if (!mrp) | |
439 | return -EINVAL; | |
440 | ||
441 | if (mrp->ring_state == BR_MRP_RING_STATE_CLOSED && | |
442 | state->ring_state != BR_MRP_RING_STATE_CLOSED) | |
443 | mrp->ring_transitions++; | |
444 | ||
445 | mrp->ring_state = state->ring_state; | |
446 | ||
447 | br_mrp_switchdev_set_ring_state(br, mrp, state->ring_state); | |
448 | ||
449 | return 0; | |
450 | } | |
451 | ||
452 | /* Set ring role, ring role can be only MRM(Media Redundancy Manager) or | |
453 | * MRC(Media Redundancy Client). | |
454 | * note: already called with rtnl_lock | |
455 | */ | |
456 | int br_mrp_set_ring_role(struct net_bridge *br, | |
457 | struct br_mrp_ring_role *role) | |
458 | { | |
459 | struct br_mrp *mrp = br_mrp_find_id(br, role->ring_id); | |
460 | int err; | |
461 | ||
462 | if (!mrp) | |
463 | return -EINVAL; | |
464 | ||
465 | mrp->ring_role = role->ring_role; | |
466 | ||
467 | /* If there is an error just bailed out */ | |
468 | err = br_mrp_switchdev_set_ring_role(br, mrp, role->ring_role); | |
469 | if (err && err != -EOPNOTSUPP) | |
470 | return err; | |
471 | ||
472 | /* Now detect if the HW actually applied the role or not. If the HW | |
473 | * applied the role it means that the SW will not to do those operations | |
474 | * anymore. For example if the role ir MRM then the HW will notify the | |
475 | * SW when ring is open, but if the is not pushed to the HW the SW will | |
476 | * need to detect when the ring is open | |
477 | */ | |
478 | mrp->ring_role_offloaded = err == -EOPNOTSUPP ? 0 : 1; | |
479 | ||
480 | return 0; | |
481 | } | |
482 | ||
c6676e7d HV |
483 | /* Start to generate or monitor MRP test frames, the frames are generated by |
484 | * HW and if it fails, they are generated by the SW. | |
9a9f26e8 HV |
485 | * note: already called with rtnl_lock |
486 | */ | |
487 | int br_mrp_start_test(struct net_bridge *br, | |
488 | struct br_mrp_start_test *test) | |
489 | { | |
490 | struct br_mrp *mrp = br_mrp_find_id(br, test->ring_id); | |
491 | ||
492 | if (!mrp) | |
493 | return -EINVAL; | |
494 | ||
c6676e7d HV |
495 | /* Try to push it to the HW and if it fails then continue with SW |
496 | * implementation and if that also fails then return error. | |
9a9f26e8 HV |
497 | */ |
498 | if (!br_mrp_switchdev_send_ring_test(br, mrp, test->interval, | |
c6676e7d HV |
499 | test->max_miss, test->period, |
500 | test->monitor)) | |
9a9f26e8 HV |
501 | return 0; |
502 | ||
503 | mrp->test_interval = test->interval; | |
504 | mrp->test_end = jiffies + usecs_to_jiffies(test->period); | |
505 | mrp->test_max_miss = test->max_miss; | |
c6676e7d | 506 | mrp->test_monitor = test->monitor; |
9a9f26e8 HV |
507 | mrp->test_count_miss = 0; |
508 | queue_delayed_work(system_wq, &mrp->test_work, | |
509 | usecs_to_jiffies(test->interval)); | |
510 | ||
511 | return 0; | |
512 | } | |
513 | ||
514 | /* Process only MRP Test frame. All the other MRP frames are processed by | |
515 | * userspace application | |
516 | * note: already called with rcu_read_lock | |
517 | */ | |
518 | static void br_mrp_mrm_process(struct br_mrp *mrp, struct net_bridge_port *port, | |
519 | struct sk_buff *skb) | |
520 | { | |
521 | const struct br_mrp_tlv_hdr *hdr; | |
522 | struct br_mrp_tlv_hdr _hdr; | |
523 | ||
524 | /* Each MRP header starts with a version field which is 16 bits. | |
525 | * Therefore skip the version and get directly the TLV header. | |
526 | */ | |
527 | hdr = skb_header_pointer(skb, sizeof(uint16_t), sizeof(_hdr), &_hdr); | |
528 | if (!hdr) | |
529 | return; | |
530 | ||
531 | if (hdr->type != BR_MRP_TLV_HEADER_RING_TEST) | |
532 | return; | |
533 | ||
534 | mrp->test_count_miss = 0; | |
535 | ||
536 | /* Notify the userspace that the ring is closed only when the ring is | |
537 | * not closed | |
538 | */ | |
539 | if (mrp->ring_state != BR_MRP_RING_STATE_CLOSED) | |
540 | br_mrp_port_open(port->dev, false); | |
541 | } | |
542 | ||
c6676e7d HV |
543 | /* Determin if the test hdr has a better priority than the node */ |
544 | static bool br_mrp_test_better_than_own(struct br_mrp *mrp, | |
545 | struct net_bridge *br, | |
546 | const struct br_mrp_ring_test_hdr *hdr) | |
547 | { | |
548 | u16 prio = be16_to_cpu(hdr->prio); | |
549 | ||
550 | if (prio < mrp->prio || | |
551 | (prio == mrp->prio && | |
552 | ether_addr_to_u64(hdr->sa) < ether_addr_to_u64(br->dev->dev_addr))) | |
553 | return true; | |
554 | ||
555 | return false; | |
556 | } | |
557 | ||
558 | /* Process only MRP Test frame. All the other MRP frames are processed by | |
559 | * userspace application | |
560 | * note: already called with rcu_read_lock | |
561 | */ | |
562 | static void br_mrp_mra_process(struct br_mrp *mrp, struct net_bridge *br, | |
563 | struct net_bridge_port *port, | |
564 | struct sk_buff *skb) | |
565 | { | |
566 | const struct br_mrp_ring_test_hdr *test_hdr; | |
567 | struct br_mrp_ring_test_hdr _test_hdr; | |
568 | const struct br_mrp_tlv_hdr *hdr; | |
569 | struct br_mrp_tlv_hdr _hdr; | |
570 | ||
571 | /* Each MRP header starts with a version field which is 16 bits. | |
572 | * Therefore skip the version and get directly the TLV header. | |
573 | */ | |
574 | hdr = skb_header_pointer(skb, sizeof(uint16_t), sizeof(_hdr), &_hdr); | |
575 | if (!hdr) | |
576 | return; | |
577 | ||
578 | if (hdr->type != BR_MRP_TLV_HEADER_RING_TEST) | |
579 | return; | |
580 | ||
581 | test_hdr = skb_header_pointer(skb, sizeof(uint16_t) + sizeof(_hdr), | |
582 | sizeof(_test_hdr), &_test_hdr); | |
583 | if (!test_hdr) | |
584 | return; | |
585 | ||
586 | /* Only frames that have a better priority than the node will | |
587 | * clear the miss counter because otherwise the node will need to behave | |
588 | * as MRM. | |
589 | */ | |
590 | if (br_mrp_test_better_than_own(mrp, br, test_hdr)) | |
591 | mrp->test_count_miss = 0; | |
592 | } | |
593 | ||
9a9f26e8 HV |
594 | /* This will just forward the frame to the other mrp ring port(MRC role) or will |
595 | * not do anything. | |
596 | * note: already called with rcu_read_lock | |
597 | */ | |
598 | static int br_mrp_rcv(struct net_bridge_port *p, | |
599 | struct sk_buff *skb, struct net_device *dev) | |
600 | { | |
601 | struct net_device *s_dev, *p_dev, *d_dev; | |
602 | struct net_bridge_port *p_port, *s_port; | |
603 | struct net_bridge *br; | |
604 | struct sk_buff *nskb; | |
605 | struct br_mrp *mrp; | |
606 | ||
607 | /* If port is disabled don't accept any frames */ | |
608 | if (p->state == BR_STATE_DISABLED) | |
609 | return 0; | |
610 | ||
611 | br = p->br; | |
612 | mrp = br_mrp_find_port(br, p); | |
613 | if (unlikely(!mrp)) | |
614 | return 0; | |
615 | ||
616 | p_port = rcu_dereference(mrp->p_port); | |
617 | if (!p_port) | |
618 | return 0; | |
619 | ||
620 | s_port = rcu_dereference(mrp->s_port); | |
621 | if (!s_port) | |
622 | return 0; | |
623 | ||
624 | /* If the role is MRM then don't forward the frames */ | |
625 | if (mrp->ring_role == BR_MRP_RING_ROLE_MRM) { | |
626 | br_mrp_mrm_process(mrp, p, skb); | |
627 | return 1; | |
628 | } | |
629 | ||
c6676e7d HV |
630 | /* If the role is MRA then don't forward the frames if it behaves as |
631 | * MRM node | |
632 | */ | |
633 | if (mrp->ring_role == BR_MRP_RING_ROLE_MRA) { | |
634 | if (!mrp->test_monitor) { | |
635 | br_mrp_mrm_process(mrp, p, skb); | |
636 | return 1; | |
637 | } | |
638 | ||
639 | br_mrp_mra_process(mrp, br, p, skb); | |
640 | } | |
641 | ||
9a9f26e8 HV |
642 | /* Clone the frame and forward it on the other MRP port */ |
643 | nskb = skb_clone(skb, GFP_ATOMIC); | |
644 | if (!nskb) | |
645 | return 0; | |
646 | ||
647 | p_dev = p_port->dev; | |
648 | s_dev = s_port->dev; | |
649 | ||
650 | if (p_dev == dev) | |
651 | d_dev = s_dev; | |
652 | else | |
653 | d_dev = p_dev; | |
654 | ||
655 | nskb->dev = d_dev; | |
656 | skb_push(nskb, ETH_HLEN); | |
657 | dev_queue_xmit(nskb); | |
658 | ||
659 | return 1; | |
660 | } | |
661 | ||
662 | /* Check if the frame was received on a port that is part of MRP ring | |
663 | * and if the frame has MRP eth. In that case process the frame otherwise do | |
664 | * normal forwarding. | |
665 | * note: already called with rcu_read_lock | |
666 | */ | |
667 | int br_mrp_process(struct net_bridge_port *p, struct sk_buff *skb) | |
668 | { | |
669 | /* If there is no MRP instance do normal forwarding */ | |
670 | if (likely(!(p->flags & BR_MRP_AWARE))) | |
671 | goto out; | |
672 | ||
673 | if (unlikely(skb->protocol == htons(ETH_P_MRP))) | |
674 | return br_mrp_rcv(p, skb, p->dev); | |
675 | ||
676 | out: | |
677 | return 0; | |
678 | } | |
679 | ||
680 | bool br_mrp_enabled(struct net_bridge *br) | |
681 | { | |
682 | return !list_empty(&br->mrp_list); | |
683 | } |