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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 */
6
7#include <linux/can/dev.h>
8#include <net/rtnetlink.h>
9
10static const struct nla_policy can_policy[IFLA_CAN_MAX + 1] = {
11 [IFLA_CAN_STATE] = { .type = NLA_U32 },
12 [IFLA_CAN_CTRLMODE] = { .len = sizeof(struct can_ctrlmode) },
13 [IFLA_CAN_RESTART_MS] = { .type = NLA_U32 },
14 [IFLA_CAN_RESTART] = { .type = NLA_U32 },
15 [IFLA_CAN_BITTIMING] = { .len = sizeof(struct can_bittiming) },
16 [IFLA_CAN_BITTIMING_CONST] = { .len = sizeof(struct can_bittiming_const) },
17 [IFLA_CAN_CLOCK] = { .len = sizeof(struct can_clock) },
18 [IFLA_CAN_BERR_COUNTER] = { .len = sizeof(struct can_berr_counter) },
19 [IFLA_CAN_DATA_BITTIMING] = { .len = sizeof(struct can_bittiming) },
20 [IFLA_CAN_DATA_BITTIMING_CONST] = { .len = sizeof(struct can_bittiming_const) },
21 [IFLA_CAN_TERMINATION] = { .type = NLA_U16 },
22};
23
24static int can_validate(struct nlattr *tb[], struct nlattr *data[],
25 struct netlink_ext_ack *extack)
26{
27 bool is_can_fd = false;
28
29 /* Make sure that valid CAN FD configurations always consist of
30 * - nominal/arbitration bittiming
31 * - data bittiming
32 * - control mode with CAN_CTRLMODE_FD set
33 */
34
35 if (!data)
36 return 0;
37
38 if (data[IFLA_CAN_CTRLMODE]) {
39 struct can_ctrlmode *cm = nla_data(data[IFLA_CAN_CTRLMODE]);
40
41 is_can_fd = cm->flags & cm->mask & CAN_CTRLMODE_FD;
42 }
43
44 if (is_can_fd) {
45 if (!data[IFLA_CAN_BITTIMING] || !data[IFLA_CAN_DATA_BITTIMING])
46 return -EOPNOTSUPP;
47 }
48
49 if (data[IFLA_CAN_DATA_BITTIMING]) {
50 if (!is_can_fd || !data[IFLA_CAN_BITTIMING])
51 return -EOPNOTSUPP;
52 }
53
54 return 0;
55}
56
57static int can_changelink(struct net_device *dev, struct nlattr *tb[],
58 struct nlattr *data[],
59 struct netlink_ext_ack *extack)
60{
61 struct can_priv *priv = netdev_priv(dev);
62 int err;
63
64 /* We need synchronization with dev->stop() */
65 ASSERT_RTNL();
66
67 if (data[IFLA_CAN_BITTIMING]) {
68 struct can_bittiming bt;
69
70 /* Do not allow changing bittiming while running */
71 if (dev->flags & IFF_UP)
72 return -EBUSY;
73
74 /* Calculate bittiming parameters based on
75 * bittiming_const if set, otherwise pass bitrate
76 * directly via do_set_bitrate(). Bail out if neither
77 * is given.
78 */
79 if (!priv->bittiming_const && !priv->do_set_bittiming)
80 return -EOPNOTSUPP;
81
82 memcpy(&bt, nla_data(data[IFLA_CAN_BITTIMING]), sizeof(bt));
83 err = can_get_bittiming(dev, &bt,
84 priv->bittiming_const,
85 priv->bitrate_const,
86 priv->bitrate_const_cnt);
87 if (err)
88 return err;
89
90 if (priv->bitrate_max && bt.bitrate > priv->bitrate_max) {
91 netdev_err(dev, "arbitration bitrate surpasses transceiver capabilities of %d bps\n",
92 priv->bitrate_max);
93 return -EINVAL;
94 }
95
96 memcpy(&priv->bittiming, &bt, sizeof(bt));
97
98 if (priv->do_set_bittiming) {
99 /* Finally, set the bit-timing registers */
100 err = priv->do_set_bittiming(dev);
101 if (err)
102 return err;
103 }
104 }
105
106 if (data[IFLA_CAN_CTRLMODE]) {
107 struct can_ctrlmode *cm;
108 u32 ctrlstatic;
109 u32 maskedflags;
110
111 /* Do not allow changing controller mode while running */
112 if (dev->flags & IFF_UP)
113 return -EBUSY;
114 cm = nla_data(data[IFLA_CAN_CTRLMODE]);
115 ctrlstatic = priv->ctrlmode_static;
116 maskedflags = cm->flags & cm->mask;
117
118 /* check whether provided bits are allowed to be passed */
119 if (cm->mask & ~(priv->ctrlmode_supported | ctrlstatic))
120 return -EOPNOTSUPP;
121
122 /* do not check for static fd-non-iso if 'fd' is disabled */
123 if (!(maskedflags & CAN_CTRLMODE_FD))
124 ctrlstatic &= ~CAN_CTRLMODE_FD_NON_ISO;
125
126 /* make sure static options are provided by configuration */
127 if ((maskedflags & ctrlstatic) != ctrlstatic)
128 return -EOPNOTSUPP;
129
130 /* clear bits to be modified and copy the flag values */
131 priv->ctrlmode &= ~cm->mask;
132 priv->ctrlmode |= maskedflags;
133
134 /* CAN_CTRLMODE_FD can only be set when driver supports FD */
135 if (priv->ctrlmode & CAN_CTRLMODE_FD)
136 dev->mtu = CANFD_MTU;
137 else
138 dev->mtu = CAN_MTU;
139 }
140
141 if (data[IFLA_CAN_RESTART_MS]) {
142 /* Do not allow changing restart delay while running */
143 if (dev->flags & IFF_UP)
144 return -EBUSY;
145 priv->restart_ms = nla_get_u32(data[IFLA_CAN_RESTART_MS]);
146 }
147
148 if (data[IFLA_CAN_RESTART]) {
149 /* Do not allow a restart while not running */
150 if (!(dev->flags & IFF_UP))
151 return -EINVAL;
152 err = can_restart_now(dev);
153 if (err)
154 return err;
155 }
156
157 if (data[IFLA_CAN_DATA_BITTIMING]) {
158 struct can_bittiming dbt;
159
160 /* Do not allow changing bittiming while running */
161 if (dev->flags & IFF_UP)
162 return -EBUSY;
163
164 /* Calculate bittiming parameters based on
165 * data_bittiming_const if set, otherwise pass bitrate
166 * directly via do_set_bitrate(). Bail out if neither
167 * is given.
168 */
169 if (!priv->data_bittiming_const && !priv->do_set_data_bittiming)
170 return -EOPNOTSUPP;
171
172 memcpy(&dbt, nla_data(data[IFLA_CAN_DATA_BITTIMING]),
173 sizeof(dbt));
174 err = can_get_bittiming(dev, &dbt,
175 priv->data_bittiming_const,
176 priv->data_bitrate_const,
177 priv->data_bitrate_const_cnt);
178 if (err)
179 return err;
180
181 if (priv->bitrate_max && dbt.bitrate > priv->bitrate_max) {
182 netdev_err(dev, "canfd data bitrate surpasses transceiver capabilities of %d bps\n",
183 priv->bitrate_max);
184 return -EINVAL;
185 }
186
187 memcpy(&priv->data_bittiming, &dbt, sizeof(dbt));
188
189 can_calc_tdco(dev);
190
191 if (priv->do_set_data_bittiming) {
192 /* Finally, set the bit-timing registers */
193 err = priv->do_set_data_bittiming(dev);
194 if (err)
195 return err;
196 }
197 }
198
199 if (data[IFLA_CAN_TERMINATION]) {
200 const u16 termval = nla_get_u16(data[IFLA_CAN_TERMINATION]);
201 const unsigned int num_term = priv->termination_const_cnt;
202 unsigned int i;
203
204 if (!priv->do_set_termination)
205 return -EOPNOTSUPP;
206
207 /* check whether given value is supported by the interface */
208 for (i = 0; i < num_term; i++) {
209 if (termval == priv->termination_const[i])
210 break;
211 }
212 if (i >= num_term)
213 return -EINVAL;
214
215 /* Finally, set the termination value */
216 err = priv->do_set_termination(dev, termval);
217 if (err)
218 return err;
219
220 priv->termination = termval;
221 }
222
223 return 0;
224}
225
226static size_t can_get_size(const struct net_device *dev)
227{
228 struct can_priv *priv = netdev_priv(dev);
229 size_t size = 0;
230
231 if (priv->bittiming.bitrate) /* IFLA_CAN_BITTIMING */
232 size += nla_total_size(sizeof(struct can_bittiming));
233 if (priv->bittiming_const) /* IFLA_CAN_BITTIMING_CONST */
234 size += nla_total_size(sizeof(struct can_bittiming_const));
235 size += nla_total_size(sizeof(struct can_clock)); /* IFLA_CAN_CLOCK */
236 size += nla_total_size(sizeof(u32)); /* IFLA_CAN_STATE */
237 size += nla_total_size(sizeof(struct can_ctrlmode)); /* IFLA_CAN_CTRLMODE */
238 size += nla_total_size(sizeof(u32)); /* IFLA_CAN_RESTART_MS */
239 if (priv->do_get_berr_counter) /* IFLA_CAN_BERR_COUNTER */
240 size += nla_total_size(sizeof(struct can_berr_counter));
241 if (priv->data_bittiming.bitrate) /* IFLA_CAN_DATA_BITTIMING */
242 size += nla_total_size(sizeof(struct can_bittiming));
243 if (priv->data_bittiming_const) /* IFLA_CAN_DATA_BITTIMING_CONST */
244 size += nla_total_size(sizeof(struct can_bittiming_const));
245 if (priv->termination_const) {
246 size += nla_total_size(sizeof(priv->termination)); /* IFLA_CAN_TERMINATION */
247 size += nla_total_size(sizeof(*priv->termination_const) * /* IFLA_CAN_TERMINATION_CONST */
248 priv->termination_const_cnt);
249 }
250 if (priv->bitrate_const) /* IFLA_CAN_BITRATE_CONST */
251 size += nla_total_size(sizeof(*priv->bitrate_const) *
252 priv->bitrate_const_cnt);
253 if (priv->data_bitrate_const) /* IFLA_CAN_DATA_BITRATE_CONST */
254 size += nla_total_size(sizeof(*priv->data_bitrate_const) *
255 priv->data_bitrate_const_cnt);
256 size += sizeof(priv->bitrate_max); /* IFLA_CAN_BITRATE_MAX */
257
258 return size;
259}
260
261static int can_fill_info(struct sk_buff *skb, const struct net_device *dev)
262{
263 struct can_priv *priv = netdev_priv(dev);
264 struct can_ctrlmode cm = {.flags = priv->ctrlmode};
265 struct can_berr_counter bec = { };
266 enum can_state state = priv->state;
267
268 if (priv->do_get_state)
269 priv->do_get_state(dev, &state);
270
271 if ((priv->bittiming.bitrate &&
272 nla_put(skb, IFLA_CAN_BITTIMING,
273 sizeof(priv->bittiming), &priv->bittiming)) ||
274
275 (priv->bittiming_const &&
276 nla_put(skb, IFLA_CAN_BITTIMING_CONST,
277 sizeof(*priv->bittiming_const), priv->bittiming_const)) ||
278
279 nla_put(skb, IFLA_CAN_CLOCK, sizeof(priv->clock), &priv->clock) ||
280 nla_put_u32(skb, IFLA_CAN_STATE, state) ||
281 nla_put(skb, IFLA_CAN_CTRLMODE, sizeof(cm), &cm) ||
282 nla_put_u32(skb, IFLA_CAN_RESTART_MS, priv->restart_ms) ||
283
284 (priv->do_get_berr_counter &&
285 !priv->do_get_berr_counter(dev, &bec) &&
286 nla_put(skb, IFLA_CAN_BERR_COUNTER, sizeof(bec), &bec)) ||
287
288 (priv->data_bittiming.bitrate &&
289 nla_put(skb, IFLA_CAN_DATA_BITTIMING,
290 sizeof(priv->data_bittiming), &priv->data_bittiming)) ||
291
292 (priv->data_bittiming_const &&
293 nla_put(skb, IFLA_CAN_DATA_BITTIMING_CONST,
294 sizeof(*priv->data_bittiming_const),
295 priv->data_bittiming_const)) ||
296
297 (priv->termination_const &&
298 (nla_put_u16(skb, IFLA_CAN_TERMINATION, priv->termination) ||
299 nla_put(skb, IFLA_CAN_TERMINATION_CONST,
300 sizeof(*priv->termination_const) *
301 priv->termination_const_cnt,
302 priv->termination_const))) ||
303
304 (priv->bitrate_const &&
305 nla_put(skb, IFLA_CAN_BITRATE_CONST,
306 sizeof(*priv->bitrate_const) *
307 priv->bitrate_const_cnt,
308 priv->bitrate_const)) ||
309
310 (priv->data_bitrate_const &&
311 nla_put(skb, IFLA_CAN_DATA_BITRATE_CONST,
312 sizeof(*priv->data_bitrate_const) *
313 priv->data_bitrate_const_cnt,
314 priv->data_bitrate_const)) ||
315
316 (nla_put(skb, IFLA_CAN_BITRATE_MAX,
317 sizeof(priv->bitrate_max),
318 &priv->bitrate_max))
319 )
320
321 return -EMSGSIZE;
322
323 return 0;
324}
325
326static size_t can_get_xstats_size(const struct net_device *dev)
327{
328 return sizeof(struct can_device_stats);
329}
330
331static int can_fill_xstats(struct sk_buff *skb, const struct net_device *dev)
332{
333 struct can_priv *priv = netdev_priv(dev);
334
335 if (nla_put(skb, IFLA_INFO_XSTATS,
336 sizeof(priv->can_stats), &priv->can_stats))
337 goto nla_put_failure;
338 return 0;
339
340nla_put_failure:
341 return -EMSGSIZE;
342}
343
344static int can_newlink(struct net *src_net, struct net_device *dev,
345 struct nlattr *tb[], struct nlattr *data[],
346 struct netlink_ext_ack *extack)
347{
348 return -EOPNOTSUPP;
349}
350
351static void can_dellink(struct net_device *dev, struct list_head *head)
352{
353}
354
355struct rtnl_link_ops can_link_ops __read_mostly = {
356 .kind = "can",
357 .netns_refund = true,
358 .maxtype = IFLA_CAN_MAX,
359 .policy = can_policy,
360 .setup = can_setup,
361 .validate = can_validate,
362 .newlink = can_newlink,
363 .changelink = can_changelink,
364 .dellink = can_dellink,
365 .get_size = can_get_size,
366 .fill_info = can_fill_info,
367 .get_xstats_size = can_get_xstats_size,
368 .fill_xstats = can_fill_xstats,
369};
370
371int can_netlink_register(void)
372{
373 return rtnl_link_register(&can_link_ops);
374}
375
376void can_netlink_unregister(void)
377{
378 rtnl_link_unregister(&can_link_ops);
379}