tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
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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_bittiming(struct nlattr *data[],
40 struct netlink_ext_ack *extack,
41 int ifla_can_bittiming)
42{
43 struct can_bittiming *bt;
44
45 if (!data[ifla_can_bittiming])
46 return 0;
47
48 static_assert(__alignof__(*bt) <= NLA_ALIGNTO);
49 bt = nla_data(data[ifla_can_bittiming]);
50
51 /* sample point is in one-tenth of a percent */
52 if (bt->sample_point >= 1000) {
53 NL_SET_ERR_MSG(extack, "sample point must be between 0 and 100%");
54 return -EINVAL;
55 }
56
57 return 0;
58}
59
60static int can_validate_tdc(struct nlattr *data_tdc,
61 struct netlink_ext_ack *extack, u32 tdc_flags)
62{
63 bool tdc_manual = tdc_flags & CAN_CTRLMODE_TDC_MANUAL_MASK;
64 bool tdc_auto = tdc_flags & CAN_CTRLMODE_TDC_AUTO_MASK;
65 int err;
66
67 if (tdc_auto && tdc_manual) {
68 NL_SET_ERR_MSG(extack,
69 "TDC manual and auto modes are mutually exclusive");
70 return -EOPNOTSUPP;
71 }
72
73 /* If one of the CAN_CTRLMODE_TDC_* flag is set then TDC
74 * must be set and vice-versa
75 */
76 if ((tdc_auto || tdc_manual) && !data_tdc) {
77 NL_SET_ERR_MSG(extack, "TDC parameters are missing");
78 return -EOPNOTSUPP;
79 }
80 if (!(tdc_auto || tdc_manual) && data_tdc) {
81 NL_SET_ERR_MSG(extack, "TDC mode (auto or manual) is missing");
82 return -EOPNOTSUPP;
83 }
84
85 /* If providing TDC parameters, at least TDCO is needed. TDCV
86 * is needed if and only if CAN_CTRLMODE_TDC_MANUAL is set
87 */
88 if (data_tdc) {
89 struct nlattr *tb_tdc[IFLA_CAN_TDC_MAX + 1];
90
91 err = nla_parse_nested(tb_tdc, IFLA_CAN_TDC_MAX,
92 data_tdc, can_tdc_policy, extack);
93 if (err)
94 return err;
95
96 if (tb_tdc[IFLA_CAN_TDC_TDCV]) {
97 if (tdc_auto) {
98 NL_SET_ERR_MSG(extack,
99 "TDCV is incompatible with TDC auto mode");
100 return -EOPNOTSUPP;
101 }
102 } else {
103 if (tdc_manual) {
104 NL_SET_ERR_MSG(extack,
105 "TDC manual mode requires TDCV");
106 return -EOPNOTSUPP;
107 }
108 }
109
110 if (!tb_tdc[IFLA_CAN_TDC_TDCO]) {
111 NL_SET_ERR_MSG(extack, "TDCO is missing");
112 return -EOPNOTSUPP;
113 }
114 }
115
116 return 0;
117}
118
119static int can_validate_databittiming(struct nlattr *data[],
120 struct netlink_ext_ack *extack,
121 int ifla_can_data_bittiming, u32 flags)
122{
123 struct nlattr *data_tdc;
124 const char *type;
125 u32 tdc_flags;
126 bool is_on;
127 int err;
128
129 /* Make sure that valid CAN FD configurations always consist of
130 * - nominal/arbitration bittiming
131 * - data bittiming
132 * - control mode with CAN_CTRLMODE_FD set
133 * - TDC parameters are coherent (details in can_validate_tdc())
134 */
135
136 if (ifla_can_data_bittiming == IFLA_CAN_DATA_BITTIMING) {
137 data_tdc = data[IFLA_CAN_TDC];
138 tdc_flags = flags & CAN_CTRLMODE_FD_TDC_MASK;
139 is_on = flags & CAN_CTRLMODE_FD;
140 type = "FD";
141 } else {
142 return -EOPNOTSUPP; /* Place holder for CAN XL */
143 }
144
145 if (is_on) {
146 if (!data[IFLA_CAN_BITTIMING] || !data[ifla_can_data_bittiming]) {
147 NL_SET_ERR_MSG_FMT(extack,
148 "Provide both nominal and %s data bittiming",
149 type);
150 return -EOPNOTSUPP;
151 }
152 } else {
153 if (data[ifla_can_data_bittiming]) {
154 NL_SET_ERR_MSG_FMT(extack,
155 "%s data bittiming requires CAN %s",
156 type, type);
157 return -EOPNOTSUPP;
158 }
159 if (data_tdc) {
160 NL_SET_ERR_MSG_FMT(extack,
161 "%s TDC requires CAN %s",
162 type, type);
163 return -EOPNOTSUPP;
164 }
165 }
166
167 err = can_validate_bittiming(data, extack, ifla_can_data_bittiming);
168 if (err)
169 return err;
170
171 err = can_validate_tdc(data_tdc, extack, tdc_flags);
172 if (err)
173 return err;
174
175 return 0;
176}
177
178static int can_validate(struct nlattr *tb[], struct nlattr *data[],
179 struct netlink_ext_ack *extack)
180{
181 u32 flags = 0;
182 int err;
183
184 if (!data)
185 return 0;
186
187 if (data[IFLA_CAN_CTRLMODE]) {
188 struct can_ctrlmode *cm = nla_data(data[IFLA_CAN_CTRLMODE]);
189
190 flags = cm->flags & cm->mask;
191 }
192
193 err = can_validate_bittiming(data, extack, IFLA_CAN_BITTIMING);
194 if (err)
195 return err;
196
197 err = can_validate_databittiming(data, extack,
198 IFLA_CAN_DATA_BITTIMING, flags);
199 if (err)
200 return err;
201
202 return 0;
203}
204
205static int can_ctrlmode_changelink(struct net_device *dev,
206 struct nlattr *data[],
207 struct netlink_ext_ack *extack)
208{
209 struct can_priv *priv = netdev_priv(dev);
210 struct can_ctrlmode *cm;
211 u32 ctrlstatic, maskedflags, notsupp, ctrlstatic_missing;
212
213 if (!data[IFLA_CAN_CTRLMODE])
214 return 0;
215
216 /* Do not allow changing controller mode while running */
217 if (dev->flags & IFF_UP)
218 return -EBUSY;
219
220 cm = nla_data(data[IFLA_CAN_CTRLMODE]);
221 ctrlstatic = can_get_static_ctrlmode(priv);
222 maskedflags = cm->flags & cm->mask;
223 notsupp = maskedflags & ~(priv->ctrlmode_supported | ctrlstatic);
224 ctrlstatic_missing = (maskedflags & ctrlstatic) ^ ctrlstatic;
225
226 if (notsupp) {
227 NL_SET_ERR_MSG_FMT(extack,
228 "requested control mode %s not supported",
229 can_get_ctrlmode_str(notsupp));
230 return -EOPNOTSUPP;
231 }
232
233 /* do not check for static fd-non-iso if 'fd' is disabled */
234 if (!(maskedflags & CAN_CTRLMODE_FD))
235 ctrlstatic &= ~CAN_CTRLMODE_FD_NON_ISO;
236
237 if (ctrlstatic_missing) {
238 NL_SET_ERR_MSG_FMT(extack,
239 "missing required %s static control mode",
240 can_get_ctrlmode_str(ctrlstatic_missing));
241 return -EOPNOTSUPP;
242 }
243
244 /* If a top dependency flag is provided, reset all its dependencies */
245 if (cm->mask & CAN_CTRLMODE_FD)
246 priv->ctrlmode &= ~CAN_CTRLMODE_FD_TDC_MASK;
247
248 /* clear bits to be modified and copy the flag values */
249 priv->ctrlmode &= ~cm->mask;
250 priv->ctrlmode |= maskedflags;
251
252 /* Wipe potential leftovers from previous CAN FD config */
253 if (!(priv->ctrlmode & CAN_CTRLMODE_FD)) {
254 memset(&priv->fd.data_bittiming, 0,
255 sizeof(priv->fd.data_bittiming));
256 priv->ctrlmode &= ~CAN_CTRLMODE_FD_TDC_MASK;
257 memset(&priv->fd.tdc, 0, sizeof(priv->fd.tdc));
258 }
259
260 can_set_default_mtu(dev);
261
262 return 0;
263}
264
265static int can_tdc_changelink(struct data_bittiming_params *dbt_params,
266 const struct nlattr *nla,
267 struct netlink_ext_ack *extack)
268{
269 struct nlattr *tb_tdc[IFLA_CAN_TDC_MAX + 1];
270 struct can_tdc tdc = { 0 };
271 const struct can_tdc_const *tdc_const = dbt_params->tdc_const;
272 int err;
273
274 if (!tdc_const) {
275 NL_SET_ERR_MSG(extack, "The device does not support TDC");
276 return -EOPNOTSUPP;
277 }
278
279 err = nla_parse_nested(tb_tdc, IFLA_CAN_TDC_MAX, nla,
280 can_tdc_policy, extack);
281 if (err)
282 return err;
283
284 if (tb_tdc[IFLA_CAN_TDC_TDCV]) {
285 u32 tdcv = nla_get_u32(tb_tdc[IFLA_CAN_TDC_TDCV]);
286
287 if (tdcv < tdc_const->tdcv_min || tdcv > tdc_const->tdcv_max)
288 return -EINVAL;
289
290 tdc.tdcv = tdcv;
291 }
292
293 if (tb_tdc[IFLA_CAN_TDC_TDCO]) {
294 u32 tdco = nla_get_u32(tb_tdc[IFLA_CAN_TDC_TDCO]);
295
296 if (tdco < tdc_const->tdco_min || tdco > tdc_const->tdco_max)
297 return -EINVAL;
298
299 tdc.tdco = tdco;
300 }
301
302 if (tb_tdc[IFLA_CAN_TDC_TDCF]) {
303 u32 tdcf = nla_get_u32(tb_tdc[IFLA_CAN_TDC_TDCF]);
304
305 if (tdcf < tdc_const->tdcf_min || tdcf > tdc_const->tdcf_max)
306 return -EINVAL;
307
308 tdc.tdcf = tdcf;
309 }
310
311 dbt_params->tdc = tdc;
312
313 return 0;
314}
315
316static int can_dbt_changelink(struct net_device *dev, struct nlattr *data[],
317 bool fd, struct netlink_ext_ack *extack)
318{
319 struct nlattr *data_bittiming, *data_tdc;
320 struct can_priv *priv = netdev_priv(dev);
321 struct data_bittiming_params *dbt_params;
322 struct can_bittiming dbt;
323 bool need_tdc_calc = false;
324 u32 tdc_mask;
325 int err;
326
327 if (fd) {
328 data_bittiming = data[IFLA_CAN_DATA_BITTIMING];
329 data_tdc = data[IFLA_CAN_TDC];
330 dbt_params = &priv->fd;
331 tdc_mask = CAN_CTRLMODE_FD_TDC_MASK;
332 } else {
333 return -EOPNOTSUPP; /* Place holder for CAN XL */
334 }
335
336 if (!data_bittiming)
337 return 0;
338
339 /* Do not allow changing bittiming while running */
340 if (dev->flags & IFF_UP)
341 return -EBUSY;
342
343 /* Calculate bittiming parameters based on data_bittiming_const
344 * if set, otherwise pass bitrate directly via do_set_bitrate().
345 * Bail out if neither is given.
346 */
347 if (!dbt_params->data_bittiming_const && !dbt_params->do_set_data_bittiming &&
348 !dbt_params->data_bitrate_const)
349 return -EOPNOTSUPP;
350
351 memcpy(&dbt, nla_data(data_bittiming), sizeof(dbt));
352 err = can_get_bittiming(dev, &dbt, dbt_params->data_bittiming_const,
353 dbt_params->data_bitrate_const,
354 dbt_params->data_bitrate_const_cnt, extack);
355 if (err)
356 return err;
357
358 if (priv->bitrate_max && dbt.bitrate > priv->bitrate_max) {
359 NL_SET_ERR_MSG_FMT(extack,
360 "CAN data bitrate %u bps surpasses transceiver capabilities of %u bps",
361 dbt.bitrate, priv->bitrate_max);
362 return -EINVAL;
363 }
364
365 memset(&dbt_params->tdc, 0, sizeof(dbt_params->tdc));
366 if (data[IFLA_CAN_CTRLMODE]) {
367 struct can_ctrlmode *cm = nla_data(data[IFLA_CAN_CTRLMODE]);
368
369 need_tdc_calc = !(cm->mask & tdc_mask);
370 }
371 if (data_tdc) {
372 /* TDC parameters are provided: use them */
373 err = can_tdc_changelink(dbt_params, data_tdc, extack);
374 if (err) {
375 priv->ctrlmode &= ~tdc_mask;
376 return err;
377 }
378 } else if (need_tdc_calc) {
379 /* Neither of TDC parameters nor TDC flags are provided:
380 * do calculation
381 */
382 can_calc_tdco(&dbt_params->tdc, dbt_params->tdc_const, &dbt,
383 tdc_mask, &priv->ctrlmode, priv->ctrlmode_supported);
384 } /* else: both CAN_CTRLMODE_TDC_{AUTO,MANUAL} are explicitly
385 * turned off. TDC is disabled: do nothing
386 */
387
388 memcpy(&dbt_params->data_bittiming, &dbt, sizeof(dbt));
389
390 if (dbt_params->do_set_data_bittiming) {
391 /* Finally, set the bit-timing registers */
392 err = dbt_params->do_set_data_bittiming(dev);
393 if (err)
394 return err;
395 }
396
397 return 0;
398}
399
400static int can_changelink(struct net_device *dev, struct nlattr *tb[],
401 struct nlattr *data[],
402 struct netlink_ext_ack *extack)
403{
404 struct can_priv *priv = netdev_priv(dev);
405 int err;
406
407 /* We need synchronization with dev->stop() */
408 ASSERT_RTNL();
409
410 can_ctrlmode_changelink(dev, data, extack);
411
412 if (data[IFLA_CAN_BITTIMING]) {
413 struct can_bittiming bt;
414
415 /* Do not allow changing bittiming while running */
416 if (dev->flags & IFF_UP)
417 return -EBUSY;
418
419 /* Calculate bittiming parameters based on
420 * bittiming_const if set, otherwise pass bitrate
421 * directly via do_set_bitrate(). Bail out if neither
422 * is given.
423 */
424 if (!priv->bittiming_const && !priv->do_set_bittiming &&
425 !priv->bitrate_const)
426 return -EOPNOTSUPP;
427
428 memcpy(&bt, nla_data(data[IFLA_CAN_BITTIMING]), sizeof(bt));
429 err = can_get_bittiming(dev, &bt,
430 priv->bittiming_const,
431 priv->bitrate_const,
432 priv->bitrate_const_cnt,
433 extack);
434 if (err)
435 return err;
436
437 if (priv->bitrate_max && bt.bitrate > priv->bitrate_max) {
438 NL_SET_ERR_MSG_FMT(extack,
439 "arbitration bitrate %u bps surpasses transceiver capabilities of %u bps",
440 bt.bitrate, priv->bitrate_max);
441 return -EINVAL;
442 }
443
444 memcpy(&priv->bittiming, &bt, sizeof(bt));
445
446 if (priv->do_set_bittiming) {
447 /* Finally, set the bit-timing registers */
448 err = priv->do_set_bittiming(dev);
449 if (err)
450 return err;
451 }
452 }
453
454 if (data[IFLA_CAN_RESTART_MS]) {
455 if (!priv->do_set_mode) {
456 NL_SET_ERR_MSG(extack,
457 "Device doesn't support restart from Bus Off");
458 return -EOPNOTSUPP;
459 }
460
461 /* Do not allow changing restart delay while running */
462 if (dev->flags & IFF_UP)
463 return -EBUSY;
464 priv->restart_ms = nla_get_u32(data[IFLA_CAN_RESTART_MS]);
465 }
466
467 if (data[IFLA_CAN_RESTART]) {
468 if (!priv->do_set_mode) {
469 NL_SET_ERR_MSG(extack,
470 "Device doesn't support restart from Bus Off");
471 return -EOPNOTSUPP;
472 }
473
474 /* Do not allow a restart while not running */
475 if (!(dev->flags & IFF_UP))
476 return -EINVAL;
477 err = can_restart_now(dev);
478 if (err)
479 return err;
480 }
481
482 /* CAN FD */
483 err = can_dbt_changelink(dev, data, true, extack);
484 if (err)
485 return err;
486
487 if (data[IFLA_CAN_TERMINATION]) {
488 const u16 termval = nla_get_u16(data[IFLA_CAN_TERMINATION]);
489 const unsigned int num_term = priv->termination_const_cnt;
490 unsigned int i;
491
492 if (!priv->do_set_termination) {
493 NL_SET_ERR_MSG(extack,
494 "Termination is not configurable on this device");
495 return -EOPNOTSUPP;
496 }
497
498 /* check whether given value is supported by the interface */
499 for (i = 0; i < num_term; i++) {
500 if (termval == priv->termination_const[i])
501 break;
502 }
503 if (i >= num_term)
504 return -EINVAL;
505
506 /* Finally, set the termination value */
507 err = priv->do_set_termination(dev, termval);
508 if (err)
509 return err;
510
511 priv->termination = termval;
512 }
513
514 return 0;
515}
516
517static size_t can_tdc_get_size(struct data_bittiming_params *dbt_params,
518 u32 tdc_flags)
519{
520 bool tdc_manual = tdc_flags & CAN_CTRLMODE_TDC_MANUAL_MASK;
521 size_t size;
522
523 if (!dbt_params->tdc_const)
524 return 0;
525
526 size = nla_total_size(0); /* nest IFLA_CAN_TDC */
527 if (tdc_manual) {
528 size += nla_total_size(sizeof(u32)); /* IFLA_CAN_TDCV_MIN */
529 size += nla_total_size(sizeof(u32)); /* IFLA_CAN_TDCV_MAX */
530 }
531 size += nla_total_size(sizeof(u32)); /* IFLA_CAN_TDCO_MIN */
532 size += nla_total_size(sizeof(u32)); /* IFLA_CAN_TDCO_MAX */
533 if (dbt_params->tdc_const->tdcf_max) {
534 size += nla_total_size(sizeof(u32)); /* IFLA_CAN_TDCF_MIN */
535 size += nla_total_size(sizeof(u32)); /* IFLA_CAN_TDCF_MAX */
536 }
537
538 if (tdc_flags) {
539 if (tdc_manual || dbt_params->do_get_auto_tdcv)
540 size += nla_total_size(sizeof(u32)); /* IFLA_CAN_TDCV */
541 size += nla_total_size(sizeof(u32)); /* IFLA_CAN_TDCO */
542 if (dbt_params->tdc_const->tdcf_max)
543 size += nla_total_size(sizeof(u32)); /* IFLA_CAN_TDCF */
544 }
545
546 return size;
547}
548
549static size_t can_data_bittiming_get_size(struct data_bittiming_params *dbt_params,
550 u32 tdc_flags)
551{
552 size_t size = 0;
553
554 if (dbt_params->data_bittiming.bitrate) /* IFLA_CAN_DATA_BITTIMING */
555 size += nla_total_size(sizeof(dbt_params->data_bittiming));
556 if (dbt_params->data_bittiming_const) /* IFLA_CAN_DATA_BITTIMING_CONST */
557 size += nla_total_size(sizeof(*dbt_params->data_bittiming_const));
558 if (dbt_params->data_bitrate_const) /* IFLA_CAN_DATA_BITRATE_CONST */
559 size += nla_total_size(sizeof(*dbt_params->data_bitrate_const) *
560 dbt_params->data_bitrate_const_cnt);
561 size += can_tdc_get_size(dbt_params, tdc_flags);/* IFLA_CAN_TDC */
562
563 return size;
564}
565
566static size_t can_ctrlmode_ext_get_size(void)
567{
568 return nla_total_size(0) + /* nest IFLA_CAN_CTRLMODE_EXT */
569 nla_total_size(sizeof(u32)); /* IFLA_CAN_CTRLMODE_SUPPORTED */
570}
571
572static size_t can_get_size(const struct net_device *dev)
573{
574 struct can_priv *priv = netdev_priv(dev);
575 size_t size = 0;
576
577 if (priv->bittiming.bitrate) /* IFLA_CAN_BITTIMING */
578 size += nla_total_size(sizeof(struct can_bittiming));
579 if (priv->bittiming_const) /* IFLA_CAN_BITTIMING_CONST */
580 size += nla_total_size(sizeof(struct can_bittiming_const));
581 size += nla_total_size(sizeof(struct can_clock)); /* IFLA_CAN_CLOCK */
582 size += nla_total_size(sizeof(u32)); /* IFLA_CAN_STATE */
583 size += nla_total_size(sizeof(struct can_ctrlmode)); /* IFLA_CAN_CTRLMODE */
584 size += nla_total_size(sizeof(u32)); /* IFLA_CAN_RESTART_MS */
585 if (priv->do_get_berr_counter) /* IFLA_CAN_BERR_COUNTER */
586 size += nla_total_size(sizeof(struct can_berr_counter));
587 if (priv->termination_const) {
588 size += nla_total_size(sizeof(priv->termination)); /* IFLA_CAN_TERMINATION */
589 size += nla_total_size(sizeof(*priv->termination_const) * /* IFLA_CAN_TERMINATION_CONST */
590 priv->termination_const_cnt);
591 }
592 if (priv->bitrate_const) /* IFLA_CAN_BITRATE_CONST */
593 size += nla_total_size(sizeof(*priv->bitrate_const) *
594 priv->bitrate_const_cnt);
595 size += sizeof(priv->bitrate_max); /* IFLA_CAN_BITRATE_MAX */
596 size += can_ctrlmode_ext_get_size(); /* IFLA_CAN_CTRLMODE_EXT */
597
598 size += can_data_bittiming_get_size(&priv->fd,
599 priv->ctrlmode & CAN_CTRLMODE_FD_TDC_MASK);
600
601 return size;
602}
603
604static int can_bittiming_fill_info(struct sk_buff *skb, int ifla_can_bittiming,
605 struct can_bittiming *bittiming)
606{
607 return bittiming->bitrate != CAN_BITRATE_UNSET &&
608 bittiming->bitrate != CAN_BITRATE_UNKNOWN &&
609 nla_put(skb, ifla_can_bittiming, sizeof(*bittiming), bittiming);
610}
611
612static int can_bittiming_const_fill_info(struct sk_buff *skb,
613 int ifla_can_bittiming_const,
614 const struct can_bittiming_const *bittiming_const)
615{
616 return bittiming_const &&
617 nla_put(skb, ifla_can_bittiming_const,
618 sizeof(*bittiming_const), bittiming_const);
619}
620
621static int can_bitrate_const_fill_info(struct sk_buff *skb,
622 int ifla_can_bitrate_const,
623 const u32 *bitrate_const, unsigned int cnt)
624{
625 return bitrate_const &&
626 nla_put(skb, ifla_can_bitrate_const,
627 sizeof(*bitrate_const) * cnt, bitrate_const);
628}
629
630static int can_tdc_fill_info(struct sk_buff *skb, const struct net_device *dev,
631 int ifla_can_tdc)
632{
633 struct can_priv *priv = netdev_priv(dev);
634 struct data_bittiming_params *dbt_params;
635 const struct can_tdc_const *tdc_const;
636 struct can_tdc *tdc;
637 struct nlattr *nest;
638 bool tdc_is_enabled, tdc_manual;
639
640 if (ifla_can_tdc == IFLA_CAN_TDC) {
641 dbt_params = &priv->fd;
642 tdc_is_enabled = can_fd_tdc_is_enabled(priv);
643 tdc_manual = priv->ctrlmode & CAN_CTRLMODE_TDC_MANUAL;
644 } else {
645 return -EOPNOTSUPP; /* Place holder for CAN XL */
646 }
647 tdc_const = dbt_params->tdc_const;
648 tdc = &dbt_params->tdc;
649
650 if (!tdc_const)
651 return 0;
652
653 nest = nla_nest_start(skb, ifla_can_tdc);
654 if (!nest)
655 return -EMSGSIZE;
656
657 if (tdc_manual &&
658 (nla_put_u32(skb, IFLA_CAN_TDC_TDCV_MIN, tdc_const->tdcv_min) ||
659 nla_put_u32(skb, IFLA_CAN_TDC_TDCV_MAX, tdc_const->tdcv_max)))
660 goto err_cancel;
661 if (nla_put_u32(skb, IFLA_CAN_TDC_TDCO_MIN, tdc_const->tdco_min) ||
662 nla_put_u32(skb, IFLA_CAN_TDC_TDCO_MAX, tdc_const->tdco_max))
663 goto err_cancel;
664 if (tdc_const->tdcf_max &&
665 (nla_put_u32(skb, IFLA_CAN_TDC_TDCF_MIN, tdc_const->tdcf_min) ||
666 nla_put_u32(skb, IFLA_CAN_TDC_TDCF_MAX, tdc_const->tdcf_max)))
667 goto err_cancel;
668
669 if (tdc_is_enabled) {
670 u32 tdcv;
671 int err = -EINVAL;
672
673 if (tdc_manual) {
674 tdcv = tdc->tdcv;
675 err = 0;
676 } else if (dbt_params->do_get_auto_tdcv) {
677 err = dbt_params->do_get_auto_tdcv(dev, &tdcv);
678 }
679 if (!err && nla_put_u32(skb, IFLA_CAN_TDC_TDCV, tdcv))
680 goto err_cancel;
681 if (nla_put_u32(skb, IFLA_CAN_TDC_TDCO, tdc->tdco))
682 goto err_cancel;
683 if (tdc_const->tdcf_max &&
684 nla_put_u32(skb, IFLA_CAN_TDC_TDCF, tdc->tdcf))
685 goto err_cancel;
686 }
687
688 nla_nest_end(skb, nest);
689 return 0;
690
691err_cancel:
692 nla_nest_cancel(skb, nest);
693 return -EMSGSIZE;
694}
695
696static int can_ctrlmode_ext_fill_info(struct sk_buff *skb,
697 const struct can_priv *priv)
698{
699 struct nlattr *nest;
700
701 nest = nla_nest_start(skb, IFLA_CAN_CTRLMODE_EXT);
702 if (!nest)
703 return -EMSGSIZE;
704
705 if (nla_put_u32(skb, IFLA_CAN_CTRLMODE_SUPPORTED,
706 priv->ctrlmode_supported)) {
707 nla_nest_cancel(skb, nest);
708 return -EMSGSIZE;
709 }
710
711 nla_nest_end(skb, nest);
712 return 0;
713}
714
715static int can_fill_info(struct sk_buff *skb, const struct net_device *dev)
716{
717 struct can_priv *priv = netdev_priv(dev);
718 struct can_ctrlmode cm = {.flags = priv->ctrlmode};
719 struct can_berr_counter bec = { };
720 enum can_state state = priv->state;
721
722 if (priv->do_get_state)
723 priv->do_get_state(dev, &state);
724
725 if (can_bittiming_fill_info(skb, IFLA_CAN_BITTIMING,
726 &priv->bittiming) ||
727
728 can_bittiming_const_fill_info(skb, IFLA_CAN_BITTIMING_CONST,
729 priv->bittiming_const) ||
730
731 nla_put(skb, IFLA_CAN_CLOCK, sizeof(priv->clock), &priv->clock) ||
732 nla_put_u32(skb, IFLA_CAN_STATE, state) ||
733 nla_put(skb, IFLA_CAN_CTRLMODE, sizeof(cm), &cm) ||
734 nla_put_u32(skb, IFLA_CAN_RESTART_MS, priv->restart_ms) ||
735
736 (priv->do_get_berr_counter &&
737 !priv->do_get_berr_counter(dev, &bec) &&
738 nla_put(skb, IFLA_CAN_BERR_COUNTER, sizeof(bec), &bec)) ||
739
740 can_bittiming_fill_info(skb, IFLA_CAN_DATA_BITTIMING,
741 &priv->fd.data_bittiming) ||
742
743 can_bittiming_const_fill_info(skb, IFLA_CAN_DATA_BITTIMING_CONST,
744 priv->fd.data_bittiming_const) ||
745
746 (priv->termination_const &&
747 (nla_put_u16(skb, IFLA_CAN_TERMINATION, priv->termination) ||
748 nla_put(skb, IFLA_CAN_TERMINATION_CONST,
749 sizeof(*priv->termination_const) *
750 priv->termination_const_cnt,
751 priv->termination_const))) ||
752
753 can_bitrate_const_fill_info(skb, IFLA_CAN_BITRATE_CONST,
754 priv->bitrate_const,
755 priv->bitrate_const_cnt) ||
756
757 can_bitrate_const_fill_info(skb, IFLA_CAN_DATA_BITRATE_CONST,
758 priv->fd.data_bitrate_const,
759 priv->fd.data_bitrate_const_cnt) ||
760
761 (nla_put(skb, IFLA_CAN_BITRATE_MAX,
762 sizeof(priv->bitrate_max),
763 &priv->bitrate_max)) ||
764
765 can_tdc_fill_info(skb, dev, IFLA_CAN_TDC) ||
766
767 can_ctrlmode_ext_fill_info(skb, priv)
768 )
769
770 return -EMSGSIZE;
771
772 return 0;
773}
774
775static size_t can_get_xstats_size(const struct net_device *dev)
776{
777 return sizeof(struct can_device_stats);
778}
779
780static int can_fill_xstats(struct sk_buff *skb, const struct net_device *dev)
781{
782 struct can_priv *priv = netdev_priv(dev);
783
784 if (nla_put(skb, IFLA_INFO_XSTATS,
785 sizeof(priv->can_stats), &priv->can_stats))
786 goto nla_put_failure;
787 return 0;
788
789nla_put_failure:
790 return -EMSGSIZE;
791}
792
793static int can_newlink(struct net_device *dev,
794 struct rtnl_newlink_params *params,
795 struct netlink_ext_ack *extack)
796{
797 return -EOPNOTSUPP;
798}
799
800static void can_dellink(struct net_device *dev, struct list_head *head)
801{
802}
803
804struct rtnl_link_ops can_link_ops __read_mostly = {
805 .kind = "can",
806 .netns_refund = true,
807 .maxtype = IFLA_CAN_MAX,
808 .policy = can_policy,
809 .setup = can_setup,
810 .validate = can_validate,
811 .newlink = can_newlink,
812 .changelink = can_changelink,
813 .dellink = can_dellink,
814 .get_size = can_get_size,
815 .fill_info = can_fill_info,
816 .get_xstats_size = can_get_xstats_size,
817 .fill_xstats = can_fill_xstats,
818};
819
820int can_netlink_register(void)
821{
822 return rtnl_link_register(&can_link_ops);
823}
824
825void can_netlink_unregister(void)
826{
827 rtnl_link_unregister(&can_link_ops);
828}