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1/* Copyright 2011-2014 Autronica Fire and Security AS
2 *
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):
9 * 2011-2014 Arvid Brodin, arvid.brodin@alten.se
10 *
11 * This file contains device methods for creating, using and destroying
12 * virtual HSR devices.
13 */
14
15#include <linux/netdevice.h>
16#include <linux/skbuff.h>
17#include <linux/etherdevice.h>
18#include <linux/rtnetlink.h>
19#include <linux/pkt_sched.h>
20#include "hsr_device.h"
21#include "hsr_slave.h"
22#include "hsr_framereg.h"
23#include "hsr_main.h"
24#include "hsr_forward.h"
25
26
27static bool is_admin_up(struct net_device *dev)
28{
29 return dev && (dev->flags & IFF_UP);
30}
31
32static bool is_slave_up(struct net_device *dev)
33{
34 return dev && is_admin_up(dev) && netif_oper_up(dev);
35}
36
37static void __hsr_set_operstate(struct net_device *dev, int transition)
38{
39 write_lock_bh(&dev_base_lock);
40 if (dev->operstate != transition) {
41 dev->operstate = transition;
42 write_unlock_bh(&dev_base_lock);
43 netdev_state_change(dev);
44 } else {
45 write_unlock_bh(&dev_base_lock);
46 }
47}
48
49static void hsr_set_operstate(struct hsr_port *master, bool has_carrier)
50{
51 if (!is_admin_up(master->dev)) {
52 __hsr_set_operstate(master->dev, IF_OPER_DOWN);
53 return;
54 }
55
56 if (has_carrier)
57 __hsr_set_operstate(master->dev, IF_OPER_UP);
58 else
59 __hsr_set_operstate(master->dev, IF_OPER_LOWERLAYERDOWN);
60}
61
62static bool hsr_check_carrier(struct hsr_port *master)
63{
64 struct hsr_port *port;
65 bool has_carrier;
66
67 has_carrier = false;
68
69 rcu_read_lock();
70 hsr_for_each_port(master->hsr, port)
71 if ((port->type != HSR_PT_MASTER) && is_slave_up(port->dev)) {
72 has_carrier = true;
73 break;
74 }
75 rcu_read_unlock();
76
77 if (has_carrier)
78 netif_carrier_on(master->dev);
79 else
80 netif_carrier_off(master->dev);
81
82 return has_carrier;
83}
84
85
86static void hsr_check_announce(struct net_device *hsr_dev,
87 unsigned char old_operstate)
88{
89 struct hsr_priv *hsr;
90
91 hsr = netdev_priv(hsr_dev);
92
93 if ((hsr_dev->operstate == IF_OPER_UP) && (old_operstate != IF_OPER_UP)) {
94 /* Went up */
95 hsr->announce_count = 0;
96 hsr->announce_timer.expires = jiffies +
97 msecs_to_jiffies(HSR_ANNOUNCE_INTERVAL);
98 add_timer(&hsr->announce_timer);
99 }
100
101 if ((hsr_dev->operstate != IF_OPER_UP) && (old_operstate == IF_OPER_UP))
102 /* Went down */
103 del_timer(&hsr->announce_timer);
104}
105
106void hsr_check_carrier_and_operstate(struct hsr_priv *hsr)
107{
108 struct hsr_port *master;
109 unsigned char old_operstate;
110 bool has_carrier;
111
112 master = hsr_port_get_hsr(hsr, HSR_PT_MASTER);
113 /* netif_stacked_transfer_operstate() cannot be used here since
114 * it doesn't set IF_OPER_LOWERLAYERDOWN (?)
115 */
116 old_operstate = master->dev->operstate;
117 has_carrier = hsr_check_carrier(master);
118 hsr_set_operstate(master, has_carrier);
119 hsr_check_announce(master->dev, old_operstate);
120}
121
122int hsr_get_max_mtu(struct hsr_priv *hsr)
123{
124 unsigned int mtu_max;
125 struct hsr_port *port;
126
127 mtu_max = ETH_DATA_LEN;
128 rcu_read_lock();
129 hsr_for_each_port(hsr, port)
130 if (port->type != HSR_PT_MASTER)
131 mtu_max = min(port->dev->mtu, mtu_max);
132 rcu_read_unlock();
133
134 if (mtu_max < HSR_HLEN)
135 return 0;
136 return mtu_max - HSR_HLEN;
137}
138
139
140static int hsr_dev_change_mtu(struct net_device *dev, int new_mtu)
141{
142 struct hsr_priv *hsr;
143 struct hsr_port *master;
144
145 hsr = netdev_priv(dev);
146 master = hsr_port_get_hsr(hsr, HSR_PT_MASTER);
147
148 if (new_mtu > hsr_get_max_mtu(hsr)) {
149 netdev_info(master->dev, "A HSR master's MTU cannot be greater than the smallest MTU of its slaves minus the HSR Tag length (%d octets).\n",
150 HSR_HLEN);
151 return -EINVAL;
152 }
153
154 dev->mtu = new_mtu;
155
156 return 0;
157}
158
159static int hsr_dev_open(struct net_device *dev)
160{
161 struct hsr_priv *hsr;
162 struct hsr_port *port;
163 char designation;
164
165 hsr = netdev_priv(dev);
166 designation = '\0';
167
168 rcu_read_lock();
169 hsr_for_each_port(hsr, port) {
170 if (port->type == HSR_PT_MASTER)
171 continue;
172 switch (port->type) {
173 case HSR_PT_SLAVE_A:
174 designation = 'A';
175 break;
176 case HSR_PT_SLAVE_B:
177 designation = 'B';
178 break;
179 default:
180 designation = '?';
181 }
182 if (!is_slave_up(port->dev))
183 netdev_warn(dev, "Slave %c (%s) is not up; please bring it up to get a fully working HSR network\n",
184 designation, port->dev->name);
185 }
186 rcu_read_unlock();
187
188 if (designation == '\0')
189 netdev_warn(dev, "No slave devices configured\n");
190
191 return 0;
192}
193
194
195static int hsr_dev_close(struct net_device *dev)
196{
197 /* Nothing to do here. */
198 return 0;
199}
200
201
202static netdev_features_t hsr_features_recompute(struct hsr_priv *hsr,
203 netdev_features_t features)
204{
205 netdev_features_t mask;
206 struct hsr_port *port;
207
208 mask = features;
209
210 /* Mask out all features that, if supported by one device, should be
211 * enabled for all devices (see NETIF_F_ONE_FOR_ALL).
212 *
213 * Anything that's off in mask will not be enabled - so only things
214 * that were in features originally, and also is in NETIF_F_ONE_FOR_ALL,
215 * may become enabled.
216 */
217 features &= ~NETIF_F_ONE_FOR_ALL;
218 hsr_for_each_port(hsr, port)
219 features = netdev_increment_features(features,
220 port->dev->features,
221 mask);
222
223 return features;
224}
225
226static netdev_features_t hsr_fix_features(struct net_device *dev,
227 netdev_features_t features)
228{
229 struct hsr_priv *hsr = netdev_priv(dev);
230
231 return hsr_features_recompute(hsr, features);
232}
233
234
235static int hsr_dev_xmit(struct sk_buff *skb, struct net_device *dev)
236{
237 struct hsr_priv *hsr = netdev_priv(dev);
238 struct hsr_port *master;
239
240 master = hsr_port_get_hsr(hsr, HSR_PT_MASTER);
241 skb->dev = master->dev;
242 hsr_forward_skb(skb, master);
243
244 return NETDEV_TX_OK;
245}
246
247
248static const struct header_ops hsr_header_ops = {
249 .create = eth_header,
250 .parse = eth_header_parse,
251};
252
253
254/* HSR:2010 supervision frames should be padded so that the whole frame,
255 * including headers and FCS, is 64 bytes (without VLAN).
256 */
257static int hsr_pad(int size)
258{
259 const int min_size = ETH_ZLEN - HSR_HLEN - ETH_HLEN;
260
261 if (size >= min_size)
262 return size;
263 return min_size;
264}
265
266static void send_hsr_supervision_frame(struct hsr_port *master, u8 type)
267{
268 struct sk_buff *skb;
269 int hlen, tlen;
270 struct hsr_sup_tag *hsr_stag;
271 struct hsr_sup_payload *hsr_sp;
272 unsigned long irqflags;
273
274 hlen = LL_RESERVED_SPACE(master->dev);
275 tlen = master->dev->needed_tailroom;
276 skb = alloc_skb(hsr_pad(sizeof(struct hsr_sup_payload)) + hlen + tlen,
277 GFP_ATOMIC);
278
279 if (skb == NULL)
280 return;
281
282 skb_reserve(skb, hlen);
283
284 skb->dev = master->dev;
285 skb->protocol = htons(ETH_P_PRP);
286 skb->priority = TC_PRIO_CONTROL;
287
288 if (dev_hard_header(skb, skb->dev, ETH_P_PRP,
289 master->hsr->sup_multicast_addr,
290 skb->dev->dev_addr, skb->len) <= 0)
291 goto out;
292 skb_reset_mac_header(skb);
293
294 hsr_stag = (typeof(hsr_stag)) skb_put(skb, sizeof(*hsr_stag));
295
296 set_hsr_stag_path(hsr_stag, 0xf);
297 set_hsr_stag_HSR_Ver(hsr_stag, 0);
298
299 spin_lock_irqsave(&master->hsr->seqnr_lock, irqflags);
300 hsr_stag->sequence_nr = htons(master->hsr->sequence_nr);
301 master->hsr->sequence_nr++;
302 spin_unlock_irqrestore(&master->hsr->seqnr_lock, irqflags);
303
304 hsr_stag->HSR_TLV_Type = type;
305 hsr_stag->HSR_TLV_Length = 12;
306
307 /* Payload: MacAddressA */
308 hsr_sp = (typeof(hsr_sp)) skb_put(skb, sizeof(*hsr_sp));
309 ether_addr_copy(hsr_sp->MacAddressA, master->dev->dev_addr);
310
311 hsr_forward_skb(skb, master);
312 return;
313
314out:
315 WARN_ONCE(1, "HSR: Could not send supervision frame\n");
316 kfree_skb(skb);
317}
318
319
320/* Announce (supervision frame) timer function
321 */
322static void hsr_announce(unsigned long data)
323{
324 struct hsr_priv *hsr;
325 struct hsr_port *master;
326
327 hsr = (struct hsr_priv *) data;
328
329 rcu_read_lock();
330 master = hsr_port_get_hsr(hsr, HSR_PT_MASTER);
331
332 if (hsr->announce_count < 3) {
333 send_hsr_supervision_frame(master, HSR_TLV_ANNOUNCE);
334 hsr->announce_count++;
335 } else {
336 send_hsr_supervision_frame(master, HSR_TLV_LIFE_CHECK);
337 }
338
339 if (hsr->announce_count < 3)
340 hsr->announce_timer.expires = jiffies +
341 msecs_to_jiffies(HSR_ANNOUNCE_INTERVAL);
342 else
343 hsr->announce_timer.expires = jiffies +
344 msecs_to_jiffies(HSR_LIFE_CHECK_INTERVAL);
345
346 if (is_admin_up(master->dev))
347 add_timer(&hsr->announce_timer);
348
349 rcu_read_unlock();
350}
351
352
353/* According to comments in the declaration of struct net_device, this function
354 * is "Called from unregister, can be used to call free_netdev". Ok then...
355 */
356static void hsr_dev_destroy(struct net_device *hsr_dev)
357{
358 struct hsr_priv *hsr;
359 struct hsr_port *port;
360
361 hsr = netdev_priv(hsr_dev);
362
363 rtnl_lock();
364 hsr_for_each_port(hsr, port)
365 hsr_del_port(port);
366 rtnl_unlock();
367
368 del_timer_sync(&hsr->prune_timer);
369 del_timer_sync(&hsr->announce_timer);
370
371 synchronize_rcu();
372 free_netdev(hsr_dev);
373}
374
375static const struct net_device_ops hsr_device_ops = {
376 .ndo_change_mtu = hsr_dev_change_mtu,
377 .ndo_open = hsr_dev_open,
378 .ndo_stop = hsr_dev_close,
379 .ndo_start_xmit = hsr_dev_xmit,
380 .ndo_fix_features = hsr_fix_features,
381};
382
383static struct device_type hsr_type = {
384 .name = "hsr",
385};
386
387void hsr_dev_setup(struct net_device *dev)
388{
389 random_ether_addr(dev->dev_addr);
390
391 ether_setup(dev);
392 dev->header_ops = &hsr_header_ops;
393 dev->netdev_ops = &hsr_device_ops;
394 SET_NETDEV_DEVTYPE(dev, &hsr_type);
395 dev->priv_flags |= IFF_NO_QUEUE;
396
397 dev->destructor = hsr_dev_destroy;
398
399 dev->hw_features = NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HIGHDMA |
400 NETIF_F_GSO_MASK | NETIF_F_HW_CSUM |
401 NETIF_F_HW_VLAN_CTAG_TX;
402
403 dev->features = dev->hw_features;
404
405 /* Prevent recursive tx locking */
406 dev->features |= NETIF_F_LLTX;
407 /* VLAN on top of HSR needs testing and probably some work on
408 * hsr_header_create() etc.
409 */
410 dev->features |= NETIF_F_VLAN_CHALLENGED;
411 /* Not sure about this. Taken from bridge code. netdev_features.h says
412 * it means "Does not change network namespaces".
413 */
414 dev->features |= NETIF_F_NETNS_LOCAL;
415}
416
417
418/* Return true if dev is a HSR master; return false otherwise.
419 */
420inline bool is_hsr_master(struct net_device *dev)
421{
422 return (dev->netdev_ops->ndo_start_xmit == hsr_dev_xmit);
423}
424
425/* Default multicast address for HSR Supervision frames */
426static const unsigned char def_multicast_addr[ETH_ALEN] __aligned(2) = {
427 0x01, 0x15, 0x4e, 0x00, 0x01, 0x00
428};
429
430int hsr_dev_finalize(struct net_device *hsr_dev, struct net_device *slave[2],
431 unsigned char multicast_spec)
432{
433 struct hsr_priv *hsr;
434 struct hsr_port *port;
435 int res;
436
437 hsr = netdev_priv(hsr_dev);
438 INIT_LIST_HEAD(&hsr->ports);
439 INIT_LIST_HEAD(&hsr->node_db);
440 INIT_LIST_HEAD(&hsr->self_node_db);
441
442 ether_addr_copy(hsr_dev->dev_addr, slave[0]->dev_addr);
443
444 /* Make sure we recognize frames from ourselves in hsr_rcv() */
445 res = hsr_create_self_node(&hsr->self_node_db, hsr_dev->dev_addr,
446 slave[1]->dev_addr);
447 if (res < 0)
448 return res;
449
450 spin_lock_init(&hsr->seqnr_lock);
451 /* Overflow soon to find bugs easier: */
452 hsr->sequence_nr = HSR_SEQNR_START;
453
454 init_timer(&hsr->announce_timer);
455 hsr->announce_timer.function = hsr_announce;
456 hsr->announce_timer.data = (unsigned long) hsr;
457
458 init_timer(&hsr->prune_timer);
459 hsr->prune_timer.function = hsr_prune_nodes;
460 hsr->prune_timer.data = (unsigned long) hsr;
461
462 ether_addr_copy(hsr->sup_multicast_addr, def_multicast_addr);
463 hsr->sup_multicast_addr[ETH_ALEN - 1] = multicast_spec;
464
465 /* FIXME: should I modify the value of these?
466 *
467 * - hsr_dev->flags - i.e.
468 * IFF_MASTER/SLAVE?
469 * - hsr_dev->priv_flags - i.e.
470 * IFF_EBRIDGE?
471 * IFF_TX_SKB_SHARING?
472 * IFF_HSR_MASTER/SLAVE?
473 */
474
475 /* Make sure the 1st call to netif_carrier_on() gets through */
476 netif_carrier_off(hsr_dev);
477
478 res = hsr_add_port(hsr, hsr_dev, HSR_PT_MASTER);
479 if (res)
480 return res;
481
482 res = register_netdevice(hsr_dev);
483 if (res)
484 goto fail;
485
486 res = hsr_add_port(hsr, slave[0], HSR_PT_SLAVE_A);
487 if (res)
488 goto fail;
489 res = hsr_add_port(hsr, slave[1], HSR_PT_SLAVE_B);
490 if (res)
491 goto fail;
492
493 hsr->prune_timer.expires = jiffies + msecs_to_jiffies(PRUNE_PERIOD);
494 add_timer(&hsr->prune_timer);
495
496 return 0;
497
498fail:
499 hsr_for_each_port(hsr, port)
500 hsr_del_port(port);
501
502 return res;
503}
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 * This file contains device methods for creating, using and destroying
7 * virtual HSR or PRP devices.
8 */
9
10#include <linux/netdevice.h>
11#include <linux/skbuff.h>
12#include <linux/etherdevice.h>
13#include <linux/rtnetlink.h>
14#include <linux/pkt_sched.h>
15#include "hsr_device.h"
16#include "hsr_slave.h"
17#include "hsr_framereg.h"
18#include "hsr_main.h"
19#include "hsr_forward.h"
20
21static bool is_admin_up(struct net_device *dev)
22{
23 return dev && (dev->flags & IFF_UP);
24}
25
26static bool is_slave_up(struct net_device *dev)
27{
28 return dev && is_admin_up(dev) && netif_oper_up(dev);
29}
30
31static void __hsr_set_operstate(struct net_device *dev, int transition)
32{
33 write_lock(&dev_base_lock);
34 if (dev->operstate != transition) {
35 dev->operstate = transition;
36 write_unlock(&dev_base_lock);
37 netdev_state_change(dev);
38 } else {
39 write_unlock(&dev_base_lock);
40 }
41}
42
43static void hsr_set_operstate(struct hsr_port *master, bool has_carrier)
44{
45 if (!is_admin_up(master->dev)) {
46 __hsr_set_operstate(master->dev, IF_OPER_DOWN);
47 return;
48 }
49
50 if (has_carrier)
51 __hsr_set_operstate(master->dev, IF_OPER_UP);
52 else
53 __hsr_set_operstate(master->dev, IF_OPER_LOWERLAYERDOWN);
54}
55
56static bool hsr_check_carrier(struct hsr_port *master)
57{
58 struct hsr_port *port;
59
60 ASSERT_RTNL();
61
62 hsr_for_each_port(master->hsr, port) {
63 if (port->type != HSR_PT_MASTER && is_slave_up(port->dev)) {
64 netif_carrier_on(master->dev);
65 return true;
66 }
67 }
68
69 netif_carrier_off(master->dev);
70
71 return false;
72}
73
74static void hsr_check_announce(struct net_device *hsr_dev,
75 unsigned char old_operstate)
76{
77 struct hsr_priv *hsr;
78
79 hsr = netdev_priv(hsr_dev);
80
81 if (hsr_dev->operstate == IF_OPER_UP && old_operstate != IF_OPER_UP) {
82 /* Went up */
83 hsr->announce_count = 0;
84 mod_timer(&hsr->announce_timer,
85 jiffies + msecs_to_jiffies(HSR_ANNOUNCE_INTERVAL));
86 }
87
88 if (hsr_dev->operstate != IF_OPER_UP && old_operstate == IF_OPER_UP)
89 /* Went down */
90 del_timer(&hsr->announce_timer);
91}
92
93void hsr_check_carrier_and_operstate(struct hsr_priv *hsr)
94{
95 struct hsr_port *master;
96 unsigned char old_operstate;
97 bool has_carrier;
98
99 master = hsr_port_get_hsr(hsr, HSR_PT_MASTER);
100 /* netif_stacked_transfer_operstate() cannot be used here since
101 * it doesn't set IF_OPER_LOWERLAYERDOWN (?)
102 */
103 old_operstate = master->dev->operstate;
104 has_carrier = hsr_check_carrier(master);
105 hsr_set_operstate(master, has_carrier);
106 hsr_check_announce(master->dev, old_operstate);
107}
108
109int hsr_get_max_mtu(struct hsr_priv *hsr)
110{
111 unsigned int mtu_max;
112 struct hsr_port *port;
113
114 mtu_max = ETH_DATA_LEN;
115 hsr_for_each_port(hsr, port)
116 if (port->type != HSR_PT_MASTER)
117 mtu_max = min(port->dev->mtu, mtu_max);
118
119 if (mtu_max < HSR_HLEN)
120 return 0;
121 return mtu_max - HSR_HLEN;
122}
123
124static int hsr_dev_change_mtu(struct net_device *dev, int new_mtu)
125{
126 struct hsr_priv *hsr;
127
128 hsr = netdev_priv(dev);
129
130 if (new_mtu > hsr_get_max_mtu(hsr)) {
131 netdev_info(dev, "A HSR master's MTU cannot be greater than the smallest MTU of its slaves minus the HSR Tag length (%d octets).\n",
132 HSR_HLEN);
133 return -EINVAL;
134 }
135
136 dev->mtu = new_mtu;
137
138 return 0;
139}
140
141static int hsr_dev_open(struct net_device *dev)
142{
143 struct hsr_priv *hsr;
144 struct hsr_port *port;
145 char designation;
146
147 hsr = netdev_priv(dev);
148 designation = '\0';
149
150 hsr_for_each_port(hsr, port) {
151 if (port->type == HSR_PT_MASTER)
152 continue;
153 switch (port->type) {
154 case HSR_PT_SLAVE_A:
155 designation = 'A';
156 break;
157 case HSR_PT_SLAVE_B:
158 designation = 'B';
159 break;
160 default:
161 designation = '?';
162 }
163 if (!is_slave_up(port->dev))
164 netdev_warn(dev, "Slave %c (%s) is not up; please bring it up to get a fully working HSR network\n",
165 designation, port->dev->name);
166 }
167
168 if (designation == '\0')
169 netdev_warn(dev, "No slave devices configured\n");
170
171 return 0;
172}
173
174static int hsr_dev_close(struct net_device *dev)
175{
176 /* Nothing to do here. */
177 return 0;
178}
179
180static netdev_features_t hsr_features_recompute(struct hsr_priv *hsr,
181 netdev_features_t features)
182{
183 netdev_features_t mask;
184 struct hsr_port *port;
185
186 mask = features;
187
188 /* Mask out all features that, if supported by one device, should be
189 * enabled for all devices (see NETIF_F_ONE_FOR_ALL).
190 *
191 * Anything that's off in mask will not be enabled - so only things
192 * that were in features originally, and also is in NETIF_F_ONE_FOR_ALL,
193 * may become enabled.
194 */
195 features &= ~NETIF_F_ONE_FOR_ALL;
196 hsr_for_each_port(hsr, port)
197 features = netdev_increment_features(features,
198 port->dev->features,
199 mask);
200
201 return features;
202}
203
204static netdev_features_t hsr_fix_features(struct net_device *dev,
205 netdev_features_t features)
206{
207 struct hsr_priv *hsr = netdev_priv(dev);
208
209 return hsr_features_recompute(hsr, features);
210}
211
212static netdev_tx_t hsr_dev_xmit(struct sk_buff *skb, struct net_device *dev)
213{
214 struct hsr_priv *hsr = netdev_priv(dev);
215 struct hsr_port *master;
216
217 master = hsr_port_get_hsr(hsr, HSR_PT_MASTER);
218 if (master) {
219 skb->dev = master->dev;
220 skb_reset_mac_header(skb);
221 skb_reset_mac_len(skb);
222 spin_lock_bh(&hsr->seqnr_lock);
223 hsr_forward_skb(skb, master);
224 spin_unlock_bh(&hsr->seqnr_lock);
225 } else {
226 dev_core_stats_tx_dropped_inc(dev);
227 dev_kfree_skb_any(skb);
228 }
229 return NETDEV_TX_OK;
230}
231
232static const struct header_ops hsr_header_ops = {
233 .create = eth_header,
234 .parse = eth_header_parse,
235};
236
237static struct sk_buff *hsr_init_skb(struct hsr_port *master)
238{
239 struct hsr_priv *hsr = master->hsr;
240 struct sk_buff *skb;
241 int hlen, tlen;
242
243 hlen = LL_RESERVED_SPACE(master->dev);
244 tlen = master->dev->needed_tailroom;
245 /* skb size is same for PRP/HSR frames, only difference
246 * being, for PRP it is a trailer and for HSR it is a
247 * header
248 */
249 skb = dev_alloc_skb(sizeof(struct hsr_sup_tag) +
250 sizeof(struct hsr_sup_payload) + hlen + tlen);
251
252 if (!skb)
253 return skb;
254
255 skb_reserve(skb, hlen);
256 skb->dev = master->dev;
257 skb->priority = TC_PRIO_CONTROL;
258
259 if (dev_hard_header(skb, skb->dev, ETH_P_PRP,
260 hsr->sup_multicast_addr,
261 skb->dev->dev_addr, skb->len) <= 0)
262 goto out;
263
264 skb_reset_mac_header(skb);
265 skb_reset_mac_len(skb);
266 skb_reset_network_header(skb);
267 skb_reset_transport_header(skb);
268
269 return skb;
270out:
271 kfree_skb(skb);
272
273 return NULL;
274}
275
276static void send_hsr_supervision_frame(struct hsr_port *master,
277 unsigned long *interval)
278{
279 struct hsr_priv *hsr = master->hsr;
280 __u8 type = HSR_TLV_LIFE_CHECK;
281 struct hsr_sup_payload *hsr_sp;
282 struct hsr_sup_tag *hsr_stag;
283 struct sk_buff *skb;
284
285 *interval = msecs_to_jiffies(HSR_LIFE_CHECK_INTERVAL);
286 if (hsr->announce_count < 3 && hsr->prot_version == 0) {
287 type = HSR_TLV_ANNOUNCE;
288 *interval = msecs_to_jiffies(HSR_ANNOUNCE_INTERVAL);
289 hsr->announce_count++;
290 }
291
292 skb = hsr_init_skb(master);
293 if (!skb) {
294 WARN_ONCE(1, "HSR: Could not send supervision frame\n");
295 return;
296 }
297
298 hsr_stag = skb_put(skb, sizeof(struct hsr_sup_tag));
299 set_hsr_stag_path(hsr_stag, (hsr->prot_version ? 0x0 : 0xf));
300 set_hsr_stag_HSR_ver(hsr_stag, hsr->prot_version);
301
302 /* From HSRv1 on we have separate supervision sequence numbers. */
303 spin_lock_bh(&hsr->seqnr_lock);
304 if (hsr->prot_version > 0) {
305 hsr_stag->sequence_nr = htons(hsr->sup_sequence_nr);
306 hsr->sup_sequence_nr++;
307 } else {
308 hsr_stag->sequence_nr = htons(hsr->sequence_nr);
309 hsr->sequence_nr++;
310 }
311
312 hsr_stag->tlv.HSR_TLV_type = type;
313 /* TODO: Why 12 in HSRv0? */
314 hsr_stag->tlv.HSR_TLV_length = hsr->prot_version ?
315 sizeof(struct hsr_sup_payload) : 12;
316
317 /* Payload: MacAddressA */
318 hsr_sp = skb_put(skb, sizeof(struct hsr_sup_payload));
319 ether_addr_copy(hsr_sp->macaddress_A, master->dev->dev_addr);
320
321 if (skb_put_padto(skb, ETH_ZLEN)) {
322 spin_unlock_bh(&hsr->seqnr_lock);
323 return;
324 }
325
326 hsr_forward_skb(skb, master);
327 spin_unlock_bh(&hsr->seqnr_lock);
328 return;
329}
330
331static void send_prp_supervision_frame(struct hsr_port *master,
332 unsigned long *interval)
333{
334 struct hsr_priv *hsr = master->hsr;
335 struct hsr_sup_payload *hsr_sp;
336 struct hsr_sup_tag *hsr_stag;
337 struct sk_buff *skb;
338
339 skb = hsr_init_skb(master);
340 if (!skb) {
341 WARN_ONCE(1, "PRP: Could not send supervision frame\n");
342 return;
343 }
344
345 *interval = msecs_to_jiffies(HSR_LIFE_CHECK_INTERVAL);
346 hsr_stag = skb_put(skb, sizeof(struct hsr_sup_tag));
347 set_hsr_stag_path(hsr_stag, (hsr->prot_version ? 0x0 : 0xf));
348 set_hsr_stag_HSR_ver(hsr_stag, (hsr->prot_version ? 1 : 0));
349
350 /* From HSRv1 on we have separate supervision sequence numbers. */
351 spin_lock_bh(&hsr->seqnr_lock);
352 hsr_stag->sequence_nr = htons(hsr->sup_sequence_nr);
353 hsr->sup_sequence_nr++;
354 hsr_stag->tlv.HSR_TLV_type = PRP_TLV_LIFE_CHECK_DD;
355 hsr_stag->tlv.HSR_TLV_length = sizeof(struct hsr_sup_payload);
356
357 /* Payload: MacAddressA */
358 hsr_sp = skb_put(skb, sizeof(struct hsr_sup_payload));
359 ether_addr_copy(hsr_sp->macaddress_A, master->dev->dev_addr);
360
361 if (skb_put_padto(skb, ETH_ZLEN)) {
362 spin_unlock_bh(&hsr->seqnr_lock);
363 return;
364 }
365
366 hsr_forward_skb(skb, master);
367 spin_unlock_bh(&hsr->seqnr_lock);
368}
369
370/* Announce (supervision frame) timer function
371 */
372static void hsr_announce(struct timer_list *t)
373{
374 struct hsr_priv *hsr;
375 struct hsr_port *master;
376 unsigned long interval;
377
378 hsr = from_timer(hsr, t, announce_timer);
379
380 rcu_read_lock();
381 master = hsr_port_get_hsr(hsr, HSR_PT_MASTER);
382 hsr->proto_ops->send_sv_frame(master, &interval);
383
384 if (is_admin_up(master->dev))
385 mod_timer(&hsr->announce_timer, jiffies + interval);
386
387 rcu_read_unlock();
388}
389
390void hsr_del_ports(struct hsr_priv *hsr)
391{
392 struct hsr_port *port;
393
394 port = hsr_port_get_hsr(hsr, HSR_PT_SLAVE_A);
395 if (port)
396 hsr_del_port(port);
397
398 port = hsr_port_get_hsr(hsr, HSR_PT_SLAVE_B);
399 if (port)
400 hsr_del_port(port);
401
402 port = hsr_port_get_hsr(hsr, HSR_PT_MASTER);
403 if (port)
404 hsr_del_port(port);
405}
406
407static const struct net_device_ops hsr_device_ops = {
408 .ndo_change_mtu = hsr_dev_change_mtu,
409 .ndo_open = hsr_dev_open,
410 .ndo_stop = hsr_dev_close,
411 .ndo_start_xmit = hsr_dev_xmit,
412 .ndo_fix_features = hsr_fix_features,
413};
414
415static struct device_type hsr_type = {
416 .name = "hsr",
417};
418
419static struct hsr_proto_ops hsr_ops = {
420 .send_sv_frame = send_hsr_supervision_frame,
421 .create_tagged_frame = hsr_create_tagged_frame,
422 .get_untagged_frame = hsr_get_untagged_frame,
423 .drop_frame = hsr_drop_frame,
424 .fill_frame_info = hsr_fill_frame_info,
425 .invalid_dan_ingress_frame = hsr_invalid_dan_ingress_frame,
426};
427
428static struct hsr_proto_ops prp_ops = {
429 .send_sv_frame = send_prp_supervision_frame,
430 .create_tagged_frame = prp_create_tagged_frame,
431 .get_untagged_frame = prp_get_untagged_frame,
432 .drop_frame = prp_drop_frame,
433 .fill_frame_info = prp_fill_frame_info,
434 .handle_san_frame = prp_handle_san_frame,
435 .update_san_info = prp_update_san_info,
436};
437
438void hsr_dev_setup(struct net_device *dev)
439{
440 eth_hw_addr_random(dev);
441
442 ether_setup(dev);
443 dev->min_mtu = 0;
444 dev->header_ops = &hsr_header_ops;
445 dev->netdev_ops = &hsr_device_ops;
446 SET_NETDEV_DEVTYPE(dev, &hsr_type);
447 dev->priv_flags |= IFF_NO_QUEUE | IFF_DISABLE_NETPOLL;
448
449 dev->needs_free_netdev = true;
450
451 dev->hw_features = NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HIGHDMA |
452 NETIF_F_GSO_MASK | NETIF_F_HW_CSUM |
453 NETIF_F_HW_VLAN_CTAG_TX;
454
455 dev->features = dev->hw_features;
456
457 /* Prevent recursive tx locking */
458 dev->features |= NETIF_F_LLTX;
459 /* VLAN on top of HSR needs testing and probably some work on
460 * hsr_header_create() etc.
461 */
462 dev->features |= NETIF_F_VLAN_CHALLENGED;
463 /* Not sure about this. Taken from bridge code. netdev_features.h says
464 * it means "Does not change network namespaces".
465 */
466 dev->features |= NETIF_F_NETNS_LOCAL;
467}
468
469/* Return true if dev is a HSR master; return false otherwise.
470 */
471bool is_hsr_master(struct net_device *dev)
472{
473 return (dev->netdev_ops->ndo_start_xmit == hsr_dev_xmit);
474}
475EXPORT_SYMBOL(is_hsr_master);
476
477/* Default multicast address for HSR Supervision frames */
478static const unsigned char def_multicast_addr[ETH_ALEN] __aligned(2) = {
479 0x01, 0x15, 0x4e, 0x00, 0x01, 0x00
480};
481
482int hsr_dev_finalize(struct net_device *hsr_dev, struct net_device *slave[2],
483 unsigned char multicast_spec, u8 protocol_version,
484 struct netlink_ext_ack *extack)
485{
486 bool unregister = false;
487 struct hsr_priv *hsr;
488 int res;
489
490 hsr = netdev_priv(hsr_dev);
491 INIT_LIST_HEAD(&hsr->ports);
492 INIT_LIST_HEAD(&hsr->node_db);
493 spin_lock_init(&hsr->list_lock);
494
495 eth_hw_addr_set(hsr_dev, slave[0]->dev_addr);
496
497 /* initialize protocol specific functions */
498 if (protocol_version == PRP_V1) {
499 /* For PRP, lan_id has most significant 3 bits holding
500 * the net_id of PRP_LAN_ID
501 */
502 hsr->net_id = PRP_LAN_ID << 1;
503 hsr->proto_ops = &prp_ops;
504 } else {
505 hsr->proto_ops = &hsr_ops;
506 }
507
508 /* Make sure we recognize frames from ourselves in hsr_rcv() */
509 res = hsr_create_self_node(hsr, hsr_dev->dev_addr,
510 slave[1]->dev_addr);
511 if (res < 0)
512 return res;
513
514 spin_lock_init(&hsr->seqnr_lock);
515 /* Overflow soon to find bugs easier: */
516 hsr->sequence_nr = HSR_SEQNR_START;
517 hsr->sup_sequence_nr = HSR_SUP_SEQNR_START;
518
519 timer_setup(&hsr->announce_timer, hsr_announce, 0);
520 timer_setup(&hsr->prune_timer, hsr_prune_nodes, 0);
521
522 ether_addr_copy(hsr->sup_multicast_addr, def_multicast_addr);
523 hsr->sup_multicast_addr[ETH_ALEN - 1] = multicast_spec;
524
525 hsr->prot_version = protocol_version;
526
527 /* Make sure the 1st call to netif_carrier_on() gets through */
528 netif_carrier_off(hsr_dev);
529
530 res = hsr_add_port(hsr, hsr_dev, HSR_PT_MASTER, extack);
531 if (res)
532 goto err_add_master;
533
534 res = register_netdevice(hsr_dev);
535 if (res)
536 goto err_unregister;
537
538 unregister = true;
539
540 res = hsr_add_port(hsr, slave[0], HSR_PT_SLAVE_A, extack);
541 if (res)
542 goto err_unregister;
543
544 res = hsr_add_port(hsr, slave[1], HSR_PT_SLAVE_B, extack);
545 if (res)
546 goto err_unregister;
547
548 hsr_debugfs_init(hsr, hsr_dev);
549 mod_timer(&hsr->prune_timer, jiffies + msecs_to_jiffies(PRUNE_PERIOD));
550
551 return 0;
552
553err_unregister:
554 hsr_del_ports(hsr);
555err_add_master:
556 hsr_del_self_node(hsr);
557
558 if (unregister)
559 unregister_netdevice(hsr_dev);
560 return res;
561}