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
is_admin_up(struct net_device * dev)21 static bool is_admin_up(struct net_device *dev)
22 {
23 return dev && (dev->flags & IFF_UP);
24 }
25
is_slave_up(struct net_device * dev)26 static bool is_slave_up(struct net_device *dev)
27 {
28 return dev && is_admin_up(dev) && netif_oper_up(dev);
29 }
30
hsr_set_operstate(struct hsr_port * master,bool has_carrier)31 static void hsr_set_operstate(struct hsr_port *master, bool has_carrier)
32 {
33 struct net_device *dev = master->dev;
34
35 if (!is_admin_up(dev)) {
36 netif_set_operstate(dev, IF_OPER_DOWN);
37 return;
38 }
39
40 if (has_carrier)
41 netif_set_operstate(dev, IF_OPER_UP);
42 else
43 netif_set_operstate(dev, IF_OPER_LOWERLAYERDOWN);
44 }
45
hsr_check_carrier(struct hsr_port * master)46 static bool hsr_check_carrier(struct hsr_port *master)
47 {
48 struct hsr_port *port;
49
50 ASSERT_RTNL();
51
52 hsr_for_each_port_rtnl(master->hsr, port) {
53 if (port->type != HSR_PT_MASTER && is_slave_up(port->dev)) {
54 netif_carrier_on(master->dev);
55 return true;
56 }
57 }
58
59 netif_carrier_off(master->dev);
60
61 return false;
62 }
63
hsr_check_announce(struct net_device * hsr_dev)64 static void hsr_check_announce(struct net_device *hsr_dev)
65 {
66 struct hsr_priv *hsr;
67
68 hsr = netdev_priv(hsr_dev);
69 if (netif_running(hsr_dev) && netif_oper_up(hsr_dev)) {
70 /* Enable announce timer and start sending supervisory frames */
71 if (!timer_pending(&hsr->announce_timer)) {
72 hsr->announce_count = 0;
73 mod_timer(&hsr->announce_timer, jiffies +
74 msecs_to_jiffies(HSR_ANNOUNCE_INTERVAL));
75 }
76
77 if (hsr->redbox && !timer_pending(&hsr->announce_proxy_timer))
78 mod_timer(&hsr->announce_proxy_timer, jiffies +
79 msecs_to_jiffies(HSR_ANNOUNCE_INTERVAL) / 2);
80 } else {
81 /* Deactivate the announce timer */
82 timer_delete(&hsr->announce_timer);
83 if (hsr->redbox)
84 timer_delete(&hsr->announce_proxy_timer);
85 }
86 }
87
hsr_check_carrier_and_operstate(struct hsr_priv * hsr)88 void hsr_check_carrier_and_operstate(struct hsr_priv *hsr)
89 {
90 struct hsr_port *master;
91 bool has_carrier;
92
93 master = hsr_port_get_hsr(hsr, HSR_PT_MASTER);
94 /* netif_stacked_transfer_operstate() cannot be used here since
95 * it doesn't set IF_OPER_LOWERLAYERDOWN (?)
96 */
97 has_carrier = hsr_check_carrier(master);
98 hsr_set_operstate(master, has_carrier);
99 hsr_check_announce(master->dev);
100 }
101
hsr_get_max_mtu(struct hsr_priv * hsr)102 int hsr_get_max_mtu(struct hsr_priv *hsr)
103 {
104 unsigned int mtu_max;
105 struct hsr_port *port;
106
107 mtu_max = ETH_DATA_LEN;
108 hsr_for_each_port_rtnl(hsr, port)
109 if (port->type != HSR_PT_MASTER)
110 mtu_max = min(port->dev->mtu, mtu_max);
111
112 if (mtu_max < HSR_HLEN)
113 return 0;
114 return mtu_max - HSR_HLEN;
115 }
116
hsr_dev_change_mtu(struct net_device * dev,int new_mtu)117 static int hsr_dev_change_mtu(struct net_device *dev, int new_mtu)
118 {
119 struct hsr_priv *hsr;
120
121 hsr = netdev_priv(dev);
122
123 if (new_mtu > hsr_get_max_mtu(hsr)) {
124 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",
125 HSR_HLEN);
126 return -EINVAL;
127 }
128
129 WRITE_ONCE(dev->mtu, new_mtu);
130
131 return 0;
132 }
133
hsr_dev_open(struct net_device * dev)134 static int hsr_dev_open(struct net_device *dev)
135 {
136 struct hsr_priv *hsr;
137 struct hsr_port *port;
138 const char *designation = NULL;
139
140 hsr = netdev_priv(dev);
141
142 hsr_for_each_port_rtnl(hsr, port) {
143 if (port->type == HSR_PT_MASTER)
144 continue;
145 switch (port->type) {
146 case HSR_PT_SLAVE_A:
147 designation = "Slave A";
148 break;
149 case HSR_PT_SLAVE_B:
150 designation = "Slave B";
151 break;
152 case HSR_PT_INTERLINK:
153 designation = "Interlink";
154 break;
155 default:
156 designation = "Unknown";
157 }
158 if (!is_slave_up(port->dev))
159 netdev_warn(dev, "%s (%s) is not up; please bring it up to get a fully working HSR network\n",
160 designation, port->dev->name);
161 }
162
163 if (!designation)
164 netdev_warn(dev, "No slave devices configured\n");
165
166 return 0;
167 }
168
hsr_dev_close(struct net_device * dev)169 static int hsr_dev_close(struct net_device *dev)
170 {
171 struct hsr_port *port;
172 struct hsr_priv *hsr;
173
174 hsr = netdev_priv(dev);
175 hsr_for_each_port_rtnl(hsr, port) {
176 if (port->type == HSR_PT_MASTER)
177 continue;
178 switch (port->type) {
179 case HSR_PT_SLAVE_A:
180 case HSR_PT_SLAVE_B:
181 dev_uc_unsync(port->dev, dev);
182 dev_mc_unsync(port->dev, dev);
183 break;
184 default:
185 break;
186 }
187 }
188
189 return 0;
190 }
191
hsr_features_recompute(struct hsr_priv * hsr,netdev_features_t features)192 static netdev_features_t hsr_features_recompute(struct hsr_priv *hsr,
193 netdev_features_t features)
194 {
195 netdev_features_t mask;
196 struct hsr_port *port;
197
198 mask = features;
199
200 /* Mask out all features that, if supported by one device, should be
201 * enabled for all devices (see NETIF_F_ONE_FOR_ALL).
202 *
203 * Anything that's off in mask will not be enabled - so only things
204 * that were in features originally, and also is in NETIF_F_ONE_FOR_ALL,
205 * may become enabled.
206 */
207 features &= ~NETIF_F_ONE_FOR_ALL;
208 hsr_for_each_port_rtnl(hsr, port)
209 features = netdev_increment_features(features,
210 port->dev->features,
211 mask);
212
213 return features;
214 }
215
hsr_fix_features(struct net_device * dev,netdev_features_t features)216 static netdev_features_t hsr_fix_features(struct net_device *dev,
217 netdev_features_t features)
218 {
219 struct hsr_priv *hsr = netdev_priv(dev);
220
221 return hsr_features_recompute(hsr, features);
222 }
223
hsr_dev_xmit(struct sk_buff * skb,struct net_device * dev)224 static netdev_tx_t hsr_dev_xmit(struct sk_buff *skb, struct net_device *dev)
225 {
226 struct hsr_priv *hsr = netdev_priv(dev);
227 struct hsr_port *master;
228
229 rcu_read_lock();
230 master = hsr_port_get_hsr(hsr, HSR_PT_MASTER);
231 if (master) {
232 skb->dev = master->dev;
233 skb_reset_mac_header(skb);
234 skb_reset_mac_len(skb);
235 spin_lock_bh(&hsr->seqnr_lock);
236 hsr_forward_skb(skb, master);
237 spin_unlock_bh(&hsr->seqnr_lock);
238 } else {
239 dev_core_stats_tx_dropped_inc(dev);
240 dev_kfree_skb_any(skb);
241 }
242 rcu_read_unlock();
243
244 return NETDEV_TX_OK;
245 }
246
247 static const struct header_ops hsr_header_ops = {
248 .create = eth_header,
249 .parse = eth_header_parse,
250 };
251
hsr_init_skb(struct hsr_port * master,int extra)252 static struct sk_buff *hsr_init_skb(struct hsr_port *master, int extra)
253 {
254 struct hsr_priv *hsr = master->hsr;
255 struct sk_buff *skb;
256 int hlen, tlen;
257 int len;
258
259 hlen = LL_RESERVED_SPACE(master->dev);
260 tlen = master->dev->needed_tailroom;
261 len = sizeof(struct hsr_sup_tag) + sizeof(struct hsr_sup_payload);
262 /* skb size is same for PRP/HSR frames, only difference
263 * being, for PRP it is a trailer and for HSR it is a
264 * header.
265 * RedBox might use @extra more bytes.
266 */
267 skb = dev_alloc_skb(len + extra + hlen + tlen);
268
269 if (!skb)
270 return skb;
271
272 skb_reserve(skb, hlen);
273 skb->dev = master->dev;
274 skb->priority = TC_PRIO_CONTROL;
275
276 skb_reset_network_header(skb);
277 skb_reset_transport_header(skb);
278 if (dev_hard_header(skb, skb->dev, ETH_P_PRP,
279 hsr->sup_multicast_addr,
280 skb->dev->dev_addr, skb->len) <= 0)
281 goto out;
282
283 skb_reset_mac_header(skb);
284 skb_reset_mac_len(skb);
285
286 return skb;
287 out:
288 kfree_skb(skb);
289
290 return NULL;
291 }
292
send_hsr_supervision_frame(struct hsr_port * port,unsigned long * interval,const unsigned char * addr)293 static void send_hsr_supervision_frame(struct hsr_port *port,
294 unsigned long *interval,
295 const unsigned char *addr)
296 {
297 struct hsr_priv *hsr = port->hsr;
298 __u8 type = HSR_TLV_LIFE_CHECK;
299 struct hsr_sup_payload *hsr_sp;
300 struct hsr_sup_tlv *hsr_stlv;
301 struct hsr_sup_tag *hsr_stag;
302 struct sk_buff *skb;
303 int extra = 0;
304
305 *interval = msecs_to_jiffies(HSR_LIFE_CHECK_INTERVAL);
306 if (hsr->announce_count < 3 && hsr->prot_version == 0) {
307 type = HSR_TLV_ANNOUNCE;
308 *interval = msecs_to_jiffies(HSR_ANNOUNCE_INTERVAL);
309 hsr->announce_count++;
310 }
311
312 if (hsr->redbox)
313 extra = sizeof(struct hsr_sup_tlv) +
314 sizeof(struct hsr_sup_payload);
315
316 skb = hsr_init_skb(port, extra);
317 if (!skb) {
318 netdev_warn_once(port->dev, "HSR: Could not send supervision frame\n");
319 return;
320 }
321
322 hsr_stag = skb_put(skb, sizeof(struct hsr_sup_tag));
323 skb_set_network_header(skb, ETH_HLEN + HSR_HLEN);
324 skb_reset_mac_len(skb);
325
326 set_hsr_stag_path(hsr_stag, (hsr->prot_version ? 0x0 : 0xf));
327 set_hsr_stag_HSR_ver(hsr_stag, hsr->prot_version);
328
329 /* From HSRv1 on we have separate supervision sequence numbers. */
330 spin_lock_bh(&hsr->seqnr_lock);
331 if (hsr->prot_version > 0) {
332 hsr_stag->sequence_nr = htons(hsr->sup_sequence_nr);
333 hsr->sup_sequence_nr++;
334 } else {
335 hsr_stag->sequence_nr = htons(hsr->sequence_nr);
336 hsr->sequence_nr++;
337 }
338
339 hsr_stag->tlv.HSR_TLV_type = type;
340 /* HSRv0 has 6 unused bytes after the MAC */
341 hsr_stag->tlv.HSR_TLV_length = hsr->prot_version ?
342 sizeof(struct hsr_sup_payload) : 12;
343
344 /* Payload: MacAddressA / SAN MAC from ProxyNodeTable */
345 hsr_sp = skb_put(skb, sizeof(struct hsr_sup_payload));
346 ether_addr_copy(hsr_sp->macaddress_A, addr);
347
348 if (hsr->redbox &&
349 hsr_is_node_in_db(&hsr->proxy_node_db, addr)) {
350 hsr_stlv = skb_put(skb, sizeof(struct hsr_sup_tlv));
351 hsr_stlv->HSR_TLV_type = PRP_TLV_REDBOX_MAC;
352 hsr_stlv->HSR_TLV_length = sizeof(struct hsr_sup_payload);
353
354 /* Payload: MacAddressRedBox */
355 hsr_sp = skb_put(skb, sizeof(struct hsr_sup_payload));
356 ether_addr_copy(hsr_sp->macaddress_A, hsr->macaddress_redbox);
357 }
358
359 if (skb_put_padto(skb, ETH_ZLEN)) {
360 spin_unlock_bh(&hsr->seqnr_lock);
361 return;
362 }
363
364 hsr_forward_skb(skb, port);
365 spin_unlock_bh(&hsr->seqnr_lock);
366 return;
367 }
368
send_prp_supervision_frame(struct hsr_port * master,unsigned long * interval,const unsigned char * addr)369 static void send_prp_supervision_frame(struct hsr_port *master,
370 unsigned long *interval,
371 const unsigned char *addr)
372 {
373 struct hsr_priv *hsr = master->hsr;
374 struct hsr_sup_payload *hsr_sp;
375 struct hsr_sup_tlv *hsr_stlv;
376 struct hsr_sup_tag *hsr_stag;
377 struct sk_buff *skb;
378 bool redbox_proxy;
379 int extra = 0;
380
381 redbox_proxy = hsr->redbox && master->type == HSR_PT_INTERLINK;
382
383 /* A proxy-announce carries a RedBox-MAC TLV and an EOT marker. */
384 if (redbox_proxy)
385 extra = sizeof(struct hsr_sup_tlv) +
386 sizeof(struct hsr_sup_payload) +
387 sizeof(struct hsr_sup_tlv);
388
389 skb = hsr_init_skb(master, extra);
390 if (!skb) {
391 netdev_warn_once(master->dev, "PRP: Could not send supervision frame\n");
392 return;
393 }
394
395 *interval = msecs_to_jiffies(HSR_LIFE_CHECK_INTERVAL);
396 hsr_stag = skb_put(skb, sizeof(struct hsr_sup_tag));
397 set_hsr_stag_path(hsr_stag, (hsr->prot_version ? 0x0 : 0xf));
398 set_hsr_stag_HSR_ver(hsr_stag, (hsr->prot_version ? 1 : 0));
399
400 /* From HSRv1 on we have separate supervision sequence numbers. */
401 spin_lock_bh(&hsr->seqnr_lock);
402 hsr_stag->sequence_nr = htons(hsr->sup_sequence_nr);
403 hsr->sup_sequence_nr++;
404 hsr_stag->tlv.HSR_TLV_type = PRP_TLV_LIFE_CHECK_DD;
405 hsr_stag->tlv.HSR_TLV_length = sizeof(struct hsr_sup_payload);
406
407 /* Payload: MacAddressA, the announced node. */
408 hsr_sp = skb_put(skb, sizeof(struct hsr_sup_payload));
409 ether_addr_copy(hsr_sp->macaddress_A, addr);
410
411 /* Proxy-announce: append the RedBox-MAC TLV (Type 30) and an explicit
412 * EOT to terminate the TLV chain before zero padding.
413 */
414 if (redbox_proxy) {
415 hsr_stlv = skb_put(skb, sizeof(struct hsr_sup_tlv));
416 hsr_stlv->HSR_TLV_type = PRP_TLV_REDBOX_MAC;
417 hsr_stlv->HSR_TLV_length = sizeof(struct hsr_sup_payload);
418
419 hsr_sp = skb_put(skb, sizeof(struct hsr_sup_payload));
420 ether_addr_copy(hsr_sp->macaddress_A, hsr->macaddress_redbox);
421
422 hsr_stlv = skb_put(skb, sizeof(struct hsr_sup_tlv));
423 hsr_stlv->HSR_TLV_type = HSR_TLV_EOT;
424 hsr_stlv->HSR_TLV_length = 0;
425 }
426
427 if (skb_put_padto(skb, ETH_ZLEN)) {
428 spin_unlock_bh(&hsr->seqnr_lock);
429 return;
430 }
431
432 hsr_forward_skb(skb, master);
433 spin_unlock_bh(&hsr->seqnr_lock);
434 }
435
436 /* Announce (supervision frame) timer function
437 */
hsr_announce(struct timer_list * t)438 static void hsr_announce(struct timer_list *t)
439 {
440 struct hsr_priv *hsr;
441 struct hsr_port *master;
442 unsigned long interval;
443
444 hsr = timer_container_of(hsr, t, announce_timer);
445
446 rcu_read_lock();
447 master = hsr_port_get_hsr(hsr, HSR_PT_MASTER);
448 hsr->proto_ops->send_sv_frame(master, &interval, master->dev->dev_addr);
449
450 if (is_admin_up(master->dev))
451 mod_timer(&hsr->announce_timer, jiffies + interval);
452
453 rcu_read_unlock();
454 }
455
456 /* Announce (supervision frame) timer function for RedBox
457 */
hsr_proxy_announce(struct timer_list * t)458 static void hsr_proxy_announce(struct timer_list *t)
459 {
460 struct hsr_priv *hsr = timer_container_of(hsr, t,
461 announce_proxy_timer);
462 struct hsr_port *interlink;
463 unsigned long interval = 0;
464 struct hsr_node *node;
465
466 rcu_read_lock();
467 /* RedBOX sends supervisory frames to HSR network with MAC addresses
468 * of SAN nodes stored in ProxyNodeTable.
469 */
470 interlink = hsr_port_get_hsr(hsr, HSR_PT_INTERLINK);
471 if (!interlink)
472 goto done;
473
474 list_for_each_entry_rcu(node, &hsr->proxy_node_db, mac_list) {
475 if (hsr_addr_is_redbox(hsr, node->macaddress_A))
476 continue;
477 hsr->proto_ops->send_sv_frame(interlink, &interval,
478 node->macaddress_A);
479 }
480
481 if (is_admin_up(interlink->dev)) {
482 if (!interval)
483 interval = msecs_to_jiffies(HSR_ANNOUNCE_INTERVAL);
484
485 mod_timer(&hsr->announce_proxy_timer, jiffies + interval);
486 }
487
488 done:
489 rcu_read_unlock();
490 }
491
hsr_del_ports(struct hsr_priv * hsr)492 void hsr_del_ports(struct hsr_priv *hsr)
493 {
494 struct hsr_port *port;
495
496 port = hsr_port_get_hsr(hsr, HSR_PT_SLAVE_A);
497 if (port)
498 hsr_del_port(port);
499
500 port = hsr_port_get_hsr(hsr, HSR_PT_SLAVE_B);
501 if (port)
502 hsr_del_port(port);
503
504 port = hsr_port_get_hsr(hsr, HSR_PT_INTERLINK);
505 if (port)
506 hsr_del_port(port);
507
508 port = hsr_port_get_hsr(hsr, HSR_PT_MASTER);
509 if (port)
510 hsr_del_port(port);
511 }
512
hsr_set_rx_mode(struct net_device * dev)513 static void hsr_set_rx_mode(struct net_device *dev)
514 {
515 struct hsr_port *port;
516 struct hsr_priv *hsr;
517
518 hsr = netdev_priv(dev);
519
520 hsr_for_each_port_rtnl(hsr, port) {
521 if (port->type == HSR_PT_MASTER)
522 continue;
523 switch (port->type) {
524 case HSR_PT_SLAVE_A:
525 case HSR_PT_SLAVE_B:
526 dev_mc_sync_multiple(port->dev, dev);
527 dev_uc_sync_multiple(port->dev, dev);
528 break;
529 default:
530 break;
531 }
532 }
533 }
534
hsr_change_rx_flags(struct net_device * dev,int change)535 static void hsr_change_rx_flags(struct net_device *dev, int change)
536 {
537 struct hsr_port *port;
538 struct hsr_priv *hsr;
539
540 hsr = netdev_priv(dev);
541
542 hsr_for_each_port_rtnl(hsr, port) {
543 if (port->type == HSR_PT_MASTER)
544 continue;
545 switch (port->type) {
546 case HSR_PT_SLAVE_A:
547 case HSR_PT_SLAVE_B:
548 if (change & IFF_ALLMULTI)
549 dev_set_allmulti(port->dev,
550 dev->flags &
551 IFF_ALLMULTI ? 1 : -1);
552 break;
553 default:
554 break;
555 }
556 }
557 }
558
hsr_ndo_vlan_rx_add_vid(struct net_device * dev,__be16 proto,u16 vid)559 static int hsr_ndo_vlan_rx_add_vid(struct net_device *dev,
560 __be16 proto, u16 vid)
561 {
562 struct net_device *slave_a_dev = NULL;
563 struct net_device *slave_b_dev = NULL;
564 struct hsr_port *port;
565 struct hsr_priv *hsr;
566 int ret = 0;
567
568 hsr = netdev_priv(dev);
569
570 hsr_for_each_port_rtnl(hsr, port) {
571 if (port->type == HSR_PT_MASTER ||
572 port->type == HSR_PT_INTERLINK)
573 continue;
574
575 ret = vlan_vid_add(port->dev, proto, vid);
576 switch (port->type) {
577 case HSR_PT_SLAVE_A:
578 if (ret) {
579 netdev_err(dev, "add vid failed for Slave-A\n");
580 goto unwind;
581 }
582 slave_a_dev = port->dev;
583 break;
584 case HSR_PT_SLAVE_B:
585 if (ret) {
586 netdev_err(dev, "add vid failed for Slave-B\n");
587 goto unwind;
588 }
589 slave_b_dev = port->dev;
590 break;
591 default:
592 if (ret)
593 goto unwind;
594 break;
595 }
596 }
597
598 return 0;
599
600 unwind:
601 if (slave_a_dev)
602 vlan_vid_del(slave_a_dev, proto, vid);
603
604 if (slave_b_dev)
605 vlan_vid_del(slave_b_dev, proto, vid);
606
607 return ret;
608 }
609
hsr_ndo_vlan_rx_kill_vid(struct net_device * dev,__be16 proto,u16 vid)610 static int hsr_ndo_vlan_rx_kill_vid(struct net_device *dev,
611 __be16 proto, u16 vid)
612 {
613 struct hsr_port *port;
614 struct hsr_priv *hsr;
615
616 hsr = netdev_priv(dev);
617
618 hsr_for_each_port_rtnl(hsr, port) {
619 switch (port->type) {
620 case HSR_PT_SLAVE_A:
621 case HSR_PT_SLAVE_B:
622 vlan_vid_del(port->dev, proto, vid);
623 break;
624 default:
625 break;
626 }
627 }
628
629 return 0;
630 }
631
632 static const struct net_device_ops hsr_device_ops = {
633 .ndo_change_mtu = hsr_dev_change_mtu,
634 .ndo_open = hsr_dev_open,
635 .ndo_stop = hsr_dev_close,
636 .ndo_start_xmit = hsr_dev_xmit,
637 .ndo_change_rx_flags = hsr_change_rx_flags,
638 .ndo_fix_features = hsr_fix_features,
639 .ndo_set_rx_mode = hsr_set_rx_mode,
640 .ndo_vlan_rx_add_vid = hsr_ndo_vlan_rx_add_vid,
641 .ndo_vlan_rx_kill_vid = hsr_ndo_vlan_rx_kill_vid,
642 };
643
644 static const struct device_type hsr_type = {
645 .name = "hsr",
646 };
647
648 static const struct hsr_proto_ops hsr_ops = {
649 .send_sv_frame = send_hsr_supervision_frame,
650 .create_tagged_frame = hsr_create_tagged_frame,
651 .get_untagged_frame = hsr_get_untagged_frame,
652 .drop_frame = hsr_drop_frame,
653 .fill_frame_info = hsr_fill_frame_info,
654 .invalid_dan_ingress_frame = hsr_invalid_dan_ingress_frame,
655 .register_frame_out = hsr_register_frame_out,
656 };
657
658 static const struct hsr_proto_ops prp_ops = {
659 .send_sv_frame = send_prp_supervision_frame,
660 .create_tagged_frame = prp_create_tagged_frame,
661 .get_untagged_frame = prp_get_untagged_frame,
662 .drop_frame = prp_drop_frame,
663 .fill_frame_info = prp_fill_frame_info,
664 .handle_san_frame = prp_handle_san_frame,
665 .update_san_info = prp_update_san_info,
666 .register_frame_out = prp_register_frame_out,
667 };
668
hsr_dev_setup(struct net_device * dev)669 void hsr_dev_setup(struct net_device *dev)
670 {
671 eth_hw_addr_random(dev);
672
673 ether_setup(dev);
674 dev->min_mtu = 0;
675 dev->header_ops = &hsr_header_ops;
676 dev->netdev_ops = &hsr_device_ops;
677 SET_NETDEV_DEVTYPE(dev, &hsr_type);
678 dev->priv_flags |= IFF_NO_QUEUE | IFF_DISABLE_NETPOLL;
679 /* Prevent recursive tx locking */
680 dev->lltx = true;
681 /* Not sure about this. Taken from bridge code. netdevice.h says
682 * it means "Does not change network namespaces".
683 */
684 dev->netns_immutable = true;
685
686 dev->needs_free_netdev = true;
687
688 dev->hw_features = NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HIGHDMA |
689 NETIF_F_GSO_MASK | NETIF_F_HW_CSUM |
690 NETIF_F_HW_VLAN_CTAG_TX |
691 NETIF_F_HW_VLAN_CTAG_FILTER;
692
693 dev->features = dev->hw_features;
694 }
695
696 /* Return true if dev is a HSR master; return false otherwise.
697 */
is_hsr_master(struct net_device * dev)698 bool is_hsr_master(struct net_device *dev)
699 {
700 return (dev->netdev_ops->ndo_start_xmit == hsr_dev_xmit);
701 }
702 EXPORT_SYMBOL(is_hsr_master);
703
hsr_get_port_ndev(struct net_device * ndev,enum hsr_port_type pt)704 struct net_device *hsr_get_port_ndev(struct net_device *ndev,
705 enum hsr_port_type pt)
706 {
707 struct hsr_priv *hsr = netdev_priv(ndev);
708 struct hsr_port *port;
709
710 rcu_read_lock();
711 hsr_for_each_port(hsr, port)
712 if (port->type == pt) {
713 dev_hold(port->dev);
714 rcu_read_unlock();
715 return port->dev;
716 }
717 rcu_read_unlock();
718 return NULL;
719 }
720 EXPORT_SYMBOL(hsr_get_port_ndev);
721
hsr_get_port_type(struct net_device * hsr_dev,struct net_device * dev,enum hsr_port_type * type)722 int hsr_get_port_type(struct net_device *hsr_dev, struct net_device *dev,
723 enum hsr_port_type *type)
724 {
725 struct hsr_priv *hsr = netdev_priv(hsr_dev);
726 struct hsr_port *port;
727
728 rcu_read_lock();
729 hsr_for_each_port(hsr, port) {
730 if (port->dev == dev) {
731 *type = port->type;
732 rcu_read_unlock();
733 return 0;
734 }
735 }
736 rcu_read_unlock();
737
738 return -EINVAL;
739 }
740 EXPORT_SYMBOL(hsr_get_port_type);
741
742 /* Default multicast address for HSR Supervision frames */
743 static const unsigned char def_multicast_addr[ETH_ALEN] __aligned(2) = {
744 0x01, 0x15, 0x4e, 0x00, 0x01, 0x00
745 };
746
hsr_dev_finalize(struct net_device * hsr_dev,struct net_device * slave[2],struct net_device * interlink,unsigned char multicast_spec,u8 protocol_version,struct netlink_ext_ack * extack)747 int hsr_dev_finalize(struct net_device *hsr_dev, struct net_device *slave[2],
748 struct net_device *interlink, unsigned char multicast_spec,
749 u8 protocol_version, struct netlink_ext_ack *extack)
750 {
751 bool unregister = false;
752 struct hsr_priv *hsr;
753 int res;
754
755 hsr = netdev_priv(hsr_dev);
756 INIT_LIST_HEAD(&hsr->ports);
757 INIT_LIST_HEAD(&hsr->node_db);
758 INIT_LIST_HEAD(&hsr->proxy_node_db);
759 spin_lock_init(&hsr->list_lock);
760
761 eth_hw_addr_set(hsr_dev, slave[0]->dev_addr);
762
763 /* initialize protocol specific functions */
764 if (protocol_version == PRP_V1) {
765 /* For PRP, lan_id has most significant 3 bits holding
766 * the net_id of PRP_LAN_ID
767 */
768 hsr->net_id = PRP_LAN_ID << 1;
769 hsr->proto_ops = &prp_ops;
770 } else {
771 hsr->proto_ops = &hsr_ops;
772 }
773
774 /* Make sure we recognize frames from ourselves in hsr_handle_frame() */
775 res = hsr_create_self_node(hsr, hsr_dev->dev_addr,
776 slave[1]->dev_addr);
777 if (res < 0)
778 return res;
779
780 spin_lock_init(&hsr->seqnr_lock);
781 /* Overflow soon to find bugs easier: */
782 hsr->sequence_nr = HSR_SEQNR_START;
783 hsr->sup_sequence_nr = HSR_SUP_SEQNR_START;
784
785 timer_setup(&hsr->announce_timer, hsr_announce, 0);
786 timer_setup(&hsr->prune_timer, hsr_prune_nodes, 0);
787 timer_setup(&hsr->prune_proxy_timer, hsr_prune_proxy_nodes, 0);
788 timer_setup(&hsr->announce_proxy_timer, hsr_proxy_announce, 0);
789
790 ether_addr_copy(hsr->sup_multicast_addr, def_multicast_addr);
791 hsr->sup_multicast_addr[ETH_ALEN - 1] = multicast_spec;
792
793 hsr->prot_version = protocol_version;
794
795 /* Make sure the 1st call to netif_carrier_on() gets through */
796 netif_carrier_off(hsr_dev);
797
798 /* Publish the RedBox state before any port is attached: the rx
799 * handlers are live from hsr_add_port() on, and hsr_add_node()
800 * sizes each node's per-port sequence state from hsr->redbox.
801 */
802 if (interlink) {
803 hsr->redbox = true;
804 ether_addr_copy(hsr->macaddress_redbox, interlink->dev_addr);
805 }
806
807 res = hsr_add_port(hsr, hsr_dev, HSR_PT_MASTER, extack);
808 if (res)
809 goto err_add_master;
810
811 /* HSR forwarding offload supported in lower device? */
812 if ((slave[0]->features & NETIF_F_HW_HSR_FWD) &&
813 (slave[1]->features & NETIF_F_HW_HSR_FWD))
814 hsr->fwd_offloaded = true;
815
816 if ((slave[0]->features & NETIF_F_HW_VLAN_CTAG_FILTER) &&
817 (slave[1]->features & NETIF_F_HW_VLAN_CTAG_FILTER))
818 hsr_dev->features |= NETIF_F_HW_VLAN_CTAG_FILTER;
819
820 res = register_netdevice(hsr_dev);
821 if (res)
822 goto err_unregister;
823
824 unregister = true;
825
826 res = hsr_add_port(hsr, slave[0], HSR_PT_SLAVE_A, extack);
827 if (res)
828 goto err_unregister;
829
830 res = hsr_add_port(hsr, slave[1], HSR_PT_SLAVE_B, extack);
831 if (res)
832 goto err_unregister;
833
834 if (protocol_version == PRP_V1) {
835 eth_hw_addr_set(slave[1], slave[0]->dev_addr);
836 call_netdevice_notifiers(NETDEV_CHANGEADDR, slave[1]);
837 }
838
839 if (interlink) {
840 res = hsr_add_port(hsr, interlink, HSR_PT_INTERLINK, extack);
841 if (res)
842 goto err_unregister;
843
844 mod_timer(&hsr->prune_proxy_timer,
845 jiffies + msecs_to_jiffies(PRUNE_PROXY_PERIOD));
846 }
847
848 hsr_debugfs_init(hsr, hsr_dev);
849 mod_timer(&hsr->prune_timer, jiffies + msecs_to_jiffies(PRUNE_PERIOD));
850
851 return 0;
852
853 err_unregister:
854 hsr_del_ports(hsr);
855 err_add_master:
856 hsr_del_self_node(hsr);
857 hsr_del_nodes(&hsr->node_db);
858 hsr_del_nodes(&hsr->proxy_node_db);
859
860 if (unregister)
861 unregister_netdevice(hsr_dev);
862 return res;
863 }
864