Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1// SPDX-License-Identifier: GPL-2.0-only
2/* Copyright (C) 2005 Marc Kleine-Budde, Pengutronix
3 * Copyright (C) 2006 Andrey Volkov, Varma Electronics
4 * Copyright (C) 2008-2009 Wolfgang Grandegger <wg@grandegger.com>
5 * Copyright (C) 2021 Vincent Mailhol <mailhol.vincent@wanadoo.fr>
6 */
7
8#include <linux/can/dev.h>
9#include <net/rtnetlink.h>
10
11static const struct nla_policy can_policy[IFLA_CAN_MAX + 1] = {
12 [IFLA_CAN_STATE] = { .type = NLA_U32 },
13 [IFLA_CAN_CTRLMODE] = { .len = sizeof(struct can_ctrlmode) },
14 [IFLA_CAN_RESTART_MS] = { .type = NLA_U32 },
15 [IFLA_CAN_RESTART] = { .type = NLA_U32 },
16 [IFLA_CAN_BITTIMING] = { .len = sizeof(struct can_bittiming) },
17 [IFLA_CAN_BITTIMING_CONST] = { .len = sizeof(struct can_bittiming_const) },
18 [IFLA_CAN_CLOCK] = { .len = sizeof(struct can_clock) },
19 [IFLA_CAN_BERR_COUNTER] = { .len = sizeof(struct can_berr_counter) },
20 [IFLA_CAN_DATA_BITTIMING] = { .len = sizeof(struct can_bittiming) },
21 [IFLA_CAN_DATA_BITTIMING_CONST] = { .len = sizeof(struct can_bittiming_const) },
22 [IFLA_CAN_TERMINATION] = { .type = NLA_U16 },
23 [IFLA_CAN_TDC] = { .type = NLA_NESTED },
24 [IFLA_CAN_CTRLMODE_EXT] = { .type = NLA_NESTED },
25};
26
27static const struct nla_policy can_tdc_policy[IFLA_CAN_TDC_MAX + 1] = {
28 [IFLA_CAN_TDC_TDCV_MIN] = { .type = NLA_U32 },
29 [IFLA_CAN_TDC_TDCV_MAX] = { .type = NLA_U32 },
30 [IFLA_CAN_TDC_TDCO_MIN] = { .type = NLA_U32 },
31 [IFLA_CAN_TDC_TDCO_MAX] = { .type = NLA_U32 },
32 [IFLA_CAN_TDC_TDCF_MIN] = { .type = NLA_U32 },
33 [IFLA_CAN_TDC_TDCF_MAX] = { .type = NLA_U32 },
34 [IFLA_CAN_TDC_TDCV] = { .type = NLA_U32 },
35 [IFLA_CAN_TDC_TDCO] = { .type = NLA_U32 },
36 [IFLA_CAN_TDC_TDCF] = { .type = NLA_U32 },
37};
38
39static int can_validate(struct nlattr *tb[], struct nlattr *data[],
40 struct netlink_ext_ack *extack)
41{
42 bool is_can_fd = false;
43
44 /* Make sure that valid CAN FD configurations always consist of
45 * - nominal/arbitration bittiming
46 * - data bittiming
47 * - control mode with CAN_CTRLMODE_FD set
48 * - TDC parameters are coherent (details below)
49 */
50
51 if (!data)
52 return 0;
53
54 if (data[IFLA_CAN_CTRLMODE]) {
55 struct can_ctrlmode *cm = nla_data(data[IFLA_CAN_CTRLMODE]);
56 u32 tdc_flags = cm->flags & CAN_CTRLMODE_TDC_MASK;
57
58 is_can_fd = cm->flags & cm->mask & CAN_CTRLMODE_FD;
59
60 /* CAN_CTRLMODE_TDC_{AUTO,MANUAL} are mutually exclusive */
61 if (tdc_flags == CAN_CTRLMODE_TDC_MASK)
62 return -EOPNOTSUPP;
63 /* If one of the CAN_CTRLMODE_TDC_* flag is set then
64 * TDC must be set and vice-versa
65 */
66 if (!!tdc_flags != !!data[IFLA_CAN_TDC])
67 return -EOPNOTSUPP;
68 /* If providing TDC parameters, at least TDCO is
69 * needed. TDCV is needed if and only if
70 * CAN_CTRLMODE_TDC_MANUAL is set
71 */
72 if (data[IFLA_CAN_TDC]) {
73 struct nlattr *tb_tdc[IFLA_CAN_TDC_MAX + 1];
74 int err;
75
76 err = nla_parse_nested(tb_tdc, IFLA_CAN_TDC_MAX,
77 data[IFLA_CAN_TDC],
78 can_tdc_policy, extack);
79 if (err)
80 return err;
81
82 if (tb_tdc[IFLA_CAN_TDC_TDCV]) {
83 if (tdc_flags & CAN_CTRLMODE_TDC_AUTO)
84 return -EOPNOTSUPP;
85 } else {
86 if (tdc_flags & CAN_CTRLMODE_TDC_MANUAL)
87 return -EOPNOTSUPP;
88 }
89
90 if (!tb_tdc[IFLA_CAN_TDC_TDCO])
91 return -EOPNOTSUPP;
92 }
93 }
94
95 if (is_can_fd) {
96 if (!data[IFLA_CAN_BITTIMING] || !data[IFLA_CAN_DATA_BITTIMING])
97 return -EOPNOTSUPP;
98 }
99
100 if (data[IFLA_CAN_DATA_BITTIMING] || data[IFLA_CAN_TDC]) {
101 if (!is_can_fd)
102 return -EOPNOTSUPP;
103 }
104
105 return 0;
106}
107
108static int can_tdc_changelink(struct can_priv *priv, const struct nlattr *nla,
109 struct netlink_ext_ack *extack)
110{
111 struct nlattr *tb_tdc[IFLA_CAN_TDC_MAX + 1];
112 struct can_tdc tdc = { 0 };
113 const struct can_tdc_const *tdc_const = priv->tdc_const;
114 int err;
115
116 if (!tdc_const || !can_tdc_is_enabled(priv))
117 return -EOPNOTSUPP;
118
119 err = nla_parse_nested(tb_tdc, IFLA_CAN_TDC_MAX, nla,
120 can_tdc_policy, extack);
121 if (err)
122 return err;
123
124 if (tb_tdc[IFLA_CAN_TDC_TDCV]) {
125 u32 tdcv = nla_get_u32(tb_tdc[IFLA_CAN_TDC_TDCV]);
126
127 if (tdcv < tdc_const->tdcv_min || tdcv > tdc_const->tdcv_max)
128 return -EINVAL;
129
130 tdc.tdcv = tdcv;
131 }
132
133 if (tb_tdc[IFLA_CAN_TDC_TDCO]) {
134 u32 tdco = nla_get_u32(tb_tdc[IFLA_CAN_TDC_TDCO]);
135
136 if (tdco < tdc_const->tdco_min || tdco > tdc_const->tdco_max)
137 return -EINVAL;
138
139 tdc.tdco = tdco;
140 }
141
142 if (tb_tdc[IFLA_CAN_TDC_TDCF]) {
143 u32 tdcf = nla_get_u32(tb_tdc[IFLA_CAN_TDC_TDCF]);
144
145 if (tdcf < tdc_const->tdcf_min || tdcf > tdc_const->tdcf_max)
146 return -EINVAL;
147
148 tdc.tdcf = tdcf;
149 }
150
151 priv->tdc = tdc;
152
153 return 0;
154}
155
156static int can_changelink(struct net_device *dev, struct nlattr *tb[],
157 struct nlattr *data[],
158 struct netlink_ext_ack *extack)
159{
160 struct can_priv *priv = netdev_priv(dev);
161 u32 tdc_mask = 0;
162 int err;
163
164 /* We need synchronization with dev->stop() */
165 ASSERT_RTNL();
166
167 if (data[IFLA_CAN_BITTIMING]) {
168 struct can_bittiming bt;
169
170 /* Do not allow changing bittiming while running */
171 if (dev->flags & IFF_UP)
172 return -EBUSY;
173
174 /* Calculate bittiming parameters based on
175 * bittiming_const if set, otherwise pass bitrate
176 * directly via do_set_bitrate(). Bail out if neither
177 * is given.
178 */
179 if (!priv->bittiming_const && !priv->do_set_bittiming)
180 return -EOPNOTSUPP;
181
182 memcpy(&bt, nla_data(data[IFLA_CAN_BITTIMING]), sizeof(bt));
183 err = can_get_bittiming(dev, &bt,
184 priv->bittiming_const,
185 priv->bitrate_const,
186 priv->bitrate_const_cnt);
187 if (err)
188 return err;
189
190 if (priv->bitrate_max && bt.bitrate > priv->bitrate_max) {
191 netdev_err(dev, "arbitration bitrate surpasses transceiver capabilities of %d bps\n",
192 priv->bitrate_max);
193 return -EINVAL;
194 }
195
196 memcpy(&priv->bittiming, &bt, sizeof(bt));
197
198 if (priv->do_set_bittiming) {
199 /* Finally, set the bit-timing registers */
200 err = priv->do_set_bittiming(dev);
201 if (err)
202 return err;
203 }
204 }
205
206 if (data[IFLA_CAN_CTRLMODE]) {
207 struct can_ctrlmode *cm;
208 u32 ctrlstatic;
209 u32 maskedflags;
210
211 /* Do not allow changing controller mode while running */
212 if (dev->flags & IFF_UP)
213 return -EBUSY;
214 cm = nla_data(data[IFLA_CAN_CTRLMODE]);
215 ctrlstatic = can_get_static_ctrlmode(priv);
216 maskedflags = cm->flags & cm->mask;
217
218 /* check whether provided bits are allowed to be passed */
219 if (maskedflags & ~(priv->ctrlmode_supported | ctrlstatic))
220 return -EOPNOTSUPP;
221
222 /* do not check for static fd-non-iso if 'fd' is disabled */
223 if (!(maskedflags & CAN_CTRLMODE_FD))
224 ctrlstatic &= ~CAN_CTRLMODE_FD_NON_ISO;
225
226 /* make sure static options are provided by configuration */
227 if ((maskedflags & ctrlstatic) != ctrlstatic)
228 return -EOPNOTSUPP;
229
230 /* clear bits to be modified and copy the flag values */
231 priv->ctrlmode &= ~cm->mask;
232 priv->ctrlmode |= maskedflags;
233
234 /* CAN_CTRLMODE_FD can only be set when driver supports FD */
235 if (priv->ctrlmode & CAN_CTRLMODE_FD) {
236 dev->mtu = CANFD_MTU;
237 } else {
238 dev->mtu = CAN_MTU;
239 memset(&priv->data_bittiming, 0,
240 sizeof(priv->data_bittiming));
241 priv->ctrlmode &= ~CAN_CTRLMODE_TDC_MASK;
242 memset(&priv->tdc, 0, sizeof(priv->tdc));
243 }
244
245 tdc_mask = cm->mask & CAN_CTRLMODE_TDC_MASK;
246 /* CAN_CTRLMODE_TDC_{AUTO,MANUAL} are mutually
247 * exclusive: make sure to turn the other one off
248 */
249 if (tdc_mask)
250 priv->ctrlmode &= cm->flags | ~CAN_CTRLMODE_TDC_MASK;
251 }
252
253 if (data[IFLA_CAN_RESTART_MS]) {
254 /* Do not allow changing restart delay while running */
255 if (dev->flags & IFF_UP)
256 return -EBUSY;
257 priv->restart_ms = nla_get_u32(data[IFLA_CAN_RESTART_MS]);
258 }
259
260 if (data[IFLA_CAN_RESTART]) {
261 /* Do not allow a restart while not running */
262 if (!(dev->flags & IFF_UP))
263 return -EINVAL;
264 err = can_restart_now(dev);
265 if (err)
266 return err;
267 }
268
269 if (data[IFLA_CAN_DATA_BITTIMING]) {
270 struct can_bittiming dbt;
271
272 /* Do not allow changing bittiming while running */
273 if (dev->flags & IFF_UP)
274 return -EBUSY;
275
276 /* Calculate bittiming parameters based on
277 * data_bittiming_const if set, otherwise pass bitrate
278 * directly via do_set_bitrate(). Bail out if neither
279 * is given.
280 */
281 if (!priv->data_bittiming_const && !priv->do_set_data_bittiming)
282 return -EOPNOTSUPP;
283
284 memcpy(&dbt, nla_data(data[IFLA_CAN_DATA_BITTIMING]),
285 sizeof(dbt));
286 err = can_get_bittiming(dev, &dbt,
287 priv->data_bittiming_const,
288 priv->data_bitrate_const,
289 priv->data_bitrate_const_cnt);
290 if (err)
291 return err;
292
293 if (priv->bitrate_max && dbt.bitrate > priv->bitrate_max) {
294 netdev_err(dev, "canfd data bitrate surpasses transceiver capabilities of %d bps\n",
295 priv->bitrate_max);
296 return -EINVAL;
297 }
298
299 memset(&priv->tdc, 0, sizeof(priv->tdc));
300 if (data[IFLA_CAN_TDC]) {
301 /* TDC parameters are provided: use them */
302 err = can_tdc_changelink(priv, data[IFLA_CAN_TDC],
303 extack);
304 if (err) {
305 priv->ctrlmode &= ~CAN_CTRLMODE_TDC_MASK;
306 return err;
307 }
308 } else if (!tdc_mask) {
309 /* Neither of TDC parameters nor TDC flags are
310 * provided: do calculation
311 */
312 can_calc_tdco(&priv->tdc, priv->tdc_const, &priv->data_bittiming,
313 &priv->ctrlmode, priv->ctrlmode_supported);
314 } /* else: both CAN_CTRLMODE_TDC_{AUTO,MANUAL} are explicitly
315 * turned off. TDC is disabled: do nothing
316 */
317
318 memcpy(&priv->data_bittiming, &dbt, sizeof(dbt));
319
320 if (priv->do_set_data_bittiming) {
321 /* Finally, set the bit-timing registers */
322 err = priv->do_set_data_bittiming(dev);
323 if (err)
324 return err;
325 }
326 }
327
328 if (data[IFLA_CAN_TERMINATION]) {
329 const u16 termval = nla_get_u16(data[IFLA_CAN_TERMINATION]);
330 const unsigned int num_term = priv->termination_const_cnt;
331 unsigned int i;
332
333 if (!priv->do_set_termination)
334 return -EOPNOTSUPP;
335
336 /* check whether given value is supported by the interface */
337 for (i = 0; i < num_term; i++) {
338 if (termval == priv->termination_const[i])
339 break;
340 }
341 if (i >= num_term)
342 return -EINVAL;
343
344 /* Finally, set the termination value */
345 err = priv->do_set_termination(dev, termval);
346 if (err)
347 return err;
348
349 priv->termination = termval;
350 }
351
352 return 0;
353}
354
355static size_t can_tdc_get_size(const struct net_device *dev)
356{
357 struct can_priv *priv = netdev_priv(dev);
358 size_t size;
359
360 if (!priv->tdc_const)
361 return 0;
362
363 size = nla_total_size(0); /* nest IFLA_CAN_TDC */
364 if (priv->ctrlmode_supported & CAN_CTRLMODE_TDC_MANUAL) {
365 size += nla_total_size(sizeof(u32)); /* IFLA_CAN_TDCV_MIN */
366 size += nla_total_size(sizeof(u32)); /* IFLA_CAN_TDCV_MAX */
367 }
368 size += nla_total_size(sizeof(u32)); /* IFLA_CAN_TDCO_MIN */
369 size += nla_total_size(sizeof(u32)); /* IFLA_CAN_TDCO_MAX */
370 if (priv->tdc_const->tdcf_max) {
371 size += nla_total_size(sizeof(u32)); /* IFLA_CAN_TDCF_MIN */
372 size += nla_total_size(sizeof(u32)); /* IFLA_CAN_TDCF_MAX */
373 }
374
375 if (can_tdc_is_enabled(priv)) {
376 if (priv->ctrlmode & CAN_CTRLMODE_TDC_MANUAL ||
377 priv->do_get_auto_tdcv)
378 size += nla_total_size(sizeof(u32)); /* IFLA_CAN_TDCV */
379 size += nla_total_size(sizeof(u32)); /* IFLA_CAN_TDCO */
380 if (priv->tdc_const->tdcf_max)
381 size += nla_total_size(sizeof(u32)); /* IFLA_CAN_TDCF */
382 }
383
384 return size;
385}
386
387static size_t can_ctrlmode_ext_get_size(void)
388{
389 return nla_total_size(0) + /* nest IFLA_CAN_CTRLMODE_EXT */
390 nla_total_size(sizeof(u32)); /* IFLA_CAN_CTRLMODE_SUPPORTED */
391}
392
393static size_t can_get_size(const struct net_device *dev)
394{
395 struct can_priv *priv = netdev_priv(dev);
396 size_t size = 0;
397
398 if (priv->bittiming.bitrate) /* IFLA_CAN_BITTIMING */
399 size += nla_total_size(sizeof(struct can_bittiming));
400 if (priv->bittiming_const) /* IFLA_CAN_BITTIMING_CONST */
401 size += nla_total_size(sizeof(struct can_bittiming_const));
402 size += nla_total_size(sizeof(struct can_clock)); /* IFLA_CAN_CLOCK */
403 size += nla_total_size(sizeof(u32)); /* IFLA_CAN_STATE */
404 size += nla_total_size(sizeof(struct can_ctrlmode)); /* IFLA_CAN_CTRLMODE */
405 size += nla_total_size(sizeof(u32)); /* IFLA_CAN_RESTART_MS */
406 if (priv->do_get_berr_counter) /* IFLA_CAN_BERR_COUNTER */
407 size += nla_total_size(sizeof(struct can_berr_counter));
408 if (priv->data_bittiming.bitrate) /* IFLA_CAN_DATA_BITTIMING */
409 size += nla_total_size(sizeof(struct can_bittiming));
410 if (priv->data_bittiming_const) /* IFLA_CAN_DATA_BITTIMING_CONST */
411 size += nla_total_size(sizeof(struct can_bittiming_const));
412 if (priv->termination_const) {
413 size += nla_total_size(sizeof(priv->termination)); /* IFLA_CAN_TERMINATION */
414 size += nla_total_size(sizeof(*priv->termination_const) * /* IFLA_CAN_TERMINATION_CONST */
415 priv->termination_const_cnt);
416 }
417 if (priv->bitrate_const) /* IFLA_CAN_BITRATE_CONST */
418 size += nla_total_size(sizeof(*priv->bitrate_const) *
419 priv->bitrate_const_cnt);
420 if (priv->data_bitrate_const) /* IFLA_CAN_DATA_BITRATE_CONST */
421 size += nla_total_size(sizeof(*priv->data_bitrate_const) *
422 priv->data_bitrate_const_cnt);
423 size += sizeof(priv->bitrate_max); /* IFLA_CAN_BITRATE_MAX */
424 size += can_tdc_get_size(dev); /* IFLA_CAN_TDC */
425 size += can_ctrlmode_ext_get_size(); /* IFLA_CAN_CTRLMODE_EXT */
426
427 return size;
428}
429
430static int can_tdc_fill_info(struct sk_buff *skb, const struct net_device *dev)
431{
432 struct nlattr *nest;
433 struct can_priv *priv = netdev_priv(dev);
434 struct can_tdc *tdc = &priv->tdc;
435 const struct can_tdc_const *tdc_const = priv->tdc_const;
436
437 if (!tdc_const)
438 return 0;
439
440 nest = nla_nest_start(skb, IFLA_CAN_TDC);
441 if (!nest)
442 return -EMSGSIZE;
443
444 if (priv->ctrlmode_supported & CAN_CTRLMODE_TDC_MANUAL &&
445 (nla_put_u32(skb, IFLA_CAN_TDC_TDCV_MIN, tdc_const->tdcv_min) ||
446 nla_put_u32(skb, IFLA_CAN_TDC_TDCV_MAX, tdc_const->tdcv_max)))
447 goto err_cancel;
448 if (nla_put_u32(skb, IFLA_CAN_TDC_TDCO_MIN, tdc_const->tdco_min) ||
449 nla_put_u32(skb, IFLA_CAN_TDC_TDCO_MAX, tdc_const->tdco_max))
450 goto err_cancel;
451 if (tdc_const->tdcf_max &&
452 (nla_put_u32(skb, IFLA_CAN_TDC_TDCF_MIN, tdc_const->tdcf_min) ||
453 nla_put_u32(skb, IFLA_CAN_TDC_TDCF_MAX, tdc_const->tdcf_max)))
454 goto err_cancel;
455
456 if (can_tdc_is_enabled(priv)) {
457 u32 tdcv;
458 int err = -EINVAL;
459
460 if (priv->ctrlmode & CAN_CTRLMODE_TDC_MANUAL) {
461 tdcv = tdc->tdcv;
462 err = 0;
463 } else if (priv->do_get_auto_tdcv) {
464 err = priv->do_get_auto_tdcv(dev, &tdcv);
465 }
466 if (!err && nla_put_u32(skb, IFLA_CAN_TDC_TDCV, tdcv))
467 goto err_cancel;
468 if (nla_put_u32(skb, IFLA_CAN_TDC_TDCO, tdc->tdco))
469 goto err_cancel;
470 if (tdc_const->tdcf_max &&
471 nla_put_u32(skb, IFLA_CAN_TDC_TDCF, tdc->tdcf))
472 goto err_cancel;
473 }
474
475 nla_nest_end(skb, nest);
476 return 0;
477
478err_cancel:
479 nla_nest_cancel(skb, nest);
480 return -EMSGSIZE;
481}
482
483static int can_ctrlmode_ext_fill_info(struct sk_buff *skb,
484 const struct can_priv *priv)
485{
486 struct nlattr *nest;
487
488 nest = nla_nest_start(skb, IFLA_CAN_CTRLMODE_EXT);
489 if (!nest)
490 return -EMSGSIZE;
491
492 if (nla_put_u32(skb, IFLA_CAN_CTRLMODE_SUPPORTED,
493 priv->ctrlmode_supported)) {
494 nla_nest_cancel(skb, nest);
495 return -EMSGSIZE;
496 }
497
498 nla_nest_end(skb, nest);
499 return 0;
500}
501
502static int can_fill_info(struct sk_buff *skb, const struct net_device *dev)
503{
504 struct can_priv *priv = netdev_priv(dev);
505 struct can_ctrlmode cm = {.flags = priv->ctrlmode};
506 struct can_berr_counter bec = { };
507 enum can_state state = priv->state;
508
509 if (priv->do_get_state)
510 priv->do_get_state(dev, &state);
511
512 if ((priv->bittiming.bitrate &&
513 nla_put(skb, IFLA_CAN_BITTIMING,
514 sizeof(priv->bittiming), &priv->bittiming)) ||
515
516 (priv->bittiming_const &&
517 nla_put(skb, IFLA_CAN_BITTIMING_CONST,
518 sizeof(*priv->bittiming_const), priv->bittiming_const)) ||
519
520 nla_put(skb, IFLA_CAN_CLOCK, sizeof(priv->clock), &priv->clock) ||
521 nla_put_u32(skb, IFLA_CAN_STATE, state) ||
522 nla_put(skb, IFLA_CAN_CTRLMODE, sizeof(cm), &cm) ||
523 nla_put_u32(skb, IFLA_CAN_RESTART_MS, priv->restart_ms) ||
524
525 (priv->do_get_berr_counter &&
526 !priv->do_get_berr_counter(dev, &bec) &&
527 nla_put(skb, IFLA_CAN_BERR_COUNTER, sizeof(bec), &bec)) ||
528
529 (priv->data_bittiming.bitrate &&
530 nla_put(skb, IFLA_CAN_DATA_BITTIMING,
531 sizeof(priv->data_bittiming), &priv->data_bittiming)) ||
532
533 (priv->data_bittiming_const &&
534 nla_put(skb, IFLA_CAN_DATA_BITTIMING_CONST,
535 sizeof(*priv->data_bittiming_const),
536 priv->data_bittiming_const)) ||
537
538 (priv->termination_const &&
539 (nla_put_u16(skb, IFLA_CAN_TERMINATION, priv->termination) ||
540 nla_put(skb, IFLA_CAN_TERMINATION_CONST,
541 sizeof(*priv->termination_const) *
542 priv->termination_const_cnt,
543 priv->termination_const))) ||
544
545 (priv->bitrate_const &&
546 nla_put(skb, IFLA_CAN_BITRATE_CONST,
547 sizeof(*priv->bitrate_const) *
548 priv->bitrate_const_cnt,
549 priv->bitrate_const)) ||
550
551 (priv->data_bitrate_const &&
552 nla_put(skb, IFLA_CAN_DATA_BITRATE_CONST,
553 sizeof(*priv->data_bitrate_const) *
554 priv->data_bitrate_const_cnt,
555 priv->data_bitrate_const)) ||
556
557 (nla_put(skb, IFLA_CAN_BITRATE_MAX,
558 sizeof(priv->bitrate_max),
559 &priv->bitrate_max)) ||
560
561 can_tdc_fill_info(skb, dev) ||
562
563 can_ctrlmode_ext_fill_info(skb, priv)
564 )
565
566 return -EMSGSIZE;
567
568 return 0;
569}
570
571static size_t can_get_xstats_size(const struct net_device *dev)
572{
573 return sizeof(struct can_device_stats);
574}
575
576static int can_fill_xstats(struct sk_buff *skb, const struct net_device *dev)
577{
578 struct can_priv *priv = netdev_priv(dev);
579
580 if (nla_put(skb, IFLA_INFO_XSTATS,
581 sizeof(priv->can_stats), &priv->can_stats))
582 goto nla_put_failure;
583 return 0;
584
585nla_put_failure:
586 return -EMSGSIZE;
587}
588
589static int can_newlink(struct net *src_net, struct net_device *dev,
590 struct nlattr *tb[], struct nlattr *data[],
591 struct netlink_ext_ack *extack)
592{
593 return -EOPNOTSUPP;
594}
595
596static void can_dellink(struct net_device *dev, struct list_head *head)
597{
598}
599
600struct rtnl_link_ops can_link_ops __read_mostly = {
601 .kind = "can",
602 .netns_refund = true,
603 .maxtype = IFLA_CAN_MAX,
604 .policy = can_policy,
605 .setup = can_setup,
606 .validate = can_validate,
607 .newlink = can_newlink,
608 .changelink = can_changelink,
609 .dellink = can_dellink,
610 .get_size = can_get_size,
611 .fill_info = can_fill_info,
612 .get_xstats_size = can_get_xstats_size,
613 .fill_xstats = can_fill_xstats,
614};
615
616int can_netlink_register(void)
617{
618 return rtnl_link_register(&can_link_ops);
619}
620
621void can_netlink_unregister(void)
622{
623 rtnl_link_unregister(&can_link_ops);
624}