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 11 static 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 27 static 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 39 static 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 } 107 108 static 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 } 155 156 static 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 !priv->bitrate_const) 181 return -EOPNOTSUPP; 182 183 memcpy(&bt, nla_data(data[IFLA_CAN_BITTIMING]), sizeof(bt)); 184 err = can_get_bittiming(dev, &bt, 185 priv->bittiming_const, 186 priv->bitrate_const, 187 priv->bitrate_const_cnt); 188 if (err) 189 return err; 190 191 if (priv->bitrate_max && bt.bitrate > priv->bitrate_max) { 192 netdev_err(dev, "arbitration bitrate surpasses transceiver capabilities of %d bps\n", 193 priv->bitrate_max); 194 return -EINVAL; 195 } 196 197 memcpy(&priv->bittiming, &bt, sizeof(bt)); 198 199 if (priv->do_set_bittiming) { 200 /* Finally, set the bit-timing registers */ 201 err = priv->do_set_bittiming(dev); 202 if (err) 203 return err; 204 } 205 } 206 207 if (data[IFLA_CAN_CTRLMODE]) { 208 struct can_ctrlmode *cm; 209 u32 ctrlstatic; 210 u32 maskedflags; 211 212 /* Do not allow changing controller mode while running */ 213 if (dev->flags & IFF_UP) 214 return -EBUSY; 215 cm = nla_data(data[IFLA_CAN_CTRLMODE]); 216 ctrlstatic = can_get_static_ctrlmode(priv); 217 maskedflags = cm->flags & cm->mask; 218 219 /* check whether provided bits are allowed to be passed */ 220 if (maskedflags & ~(priv->ctrlmode_supported | ctrlstatic)) 221 return -EOPNOTSUPP; 222 223 /* do not check for static fd-non-iso if 'fd' is disabled */ 224 if (!(maskedflags & CAN_CTRLMODE_FD)) 225 ctrlstatic &= ~CAN_CTRLMODE_FD_NON_ISO; 226 227 /* make sure static options are provided by configuration */ 228 if ((maskedflags & ctrlstatic) != ctrlstatic) 229 return -EOPNOTSUPP; 230 231 /* clear bits to be modified and copy the flag values */ 232 priv->ctrlmode &= ~cm->mask; 233 priv->ctrlmode |= maskedflags; 234 235 /* CAN_CTRLMODE_FD can only be set when driver supports FD */ 236 if (priv->ctrlmode & CAN_CTRLMODE_FD) { 237 dev->mtu = CANFD_MTU; 238 } else { 239 dev->mtu = CAN_MTU; 240 memset(&priv->data_bittiming, 0, 241 sizeof(priv->data_bittiming)); 242 priv->ctrlmode &= ~CAN_CTRLMODE_TDC_MASK; 243 memset(&priv->tdc, 0, sizeof(priv->tdc)); 244 } 245 246 tdc_mask = cm->mask & CAN_CTRLMODE_TDC_MASK; 247 /* CAN_CTRLMODE_TDC_{AUTO,MANUAL} are mutually 248 * exclusive: make sure to turn the other one off 249 */ 250 if (tdc_mask) 251 priv->ctrlmode &= cm->flags | ~CAN_CTRLMODE_TDC_MASK; 252 } 253 254 if (data[IFLA_CAN_RESTART_MS]) { 255 /* Do not allow changing restart delay while running */ 256 if (dev->flags & IFF_UP) 257 return -EBUSY; 258 priv->restart_ms = nla_get_u32(data[IFLA_CAN_RESTART_MS]); 259 } 260 261 if (data[IFLA_CAN_RESTART]) { 262 /* Do not allow a restart while not running */ 263 if (!(dev->flags & IFF_UP)) 264 return -EINVAL; 265 err = can_restart_now(dev); 266 if (err) 267 return err; 268 } 269 270 if (data[IFLA_CAN_DATA_BITTIMING]) { 271 struct can_bittiming dbt; 272 273 /* Do not allow changing bittiming while running */ 274 if (dev->flags & IFF_UP) 275 return -EBUSY; 276 277 /* Calculate bittiming parameters based on 278 * data_bittiming_const if set, otherwise pass bitrate 279 * directly via do_set_bitrate(). Bail out if neither 280 * is given. 281 */ 282 if (!priv->data_bittiming_const && !priv->do_set_data_bittiming && 283 !priv->data_bitrate_const) 284 return -EOPNOTSUPP; 285 286 memcpy(&dbt, nla_data(data[IFLA_CAN_DATA_BITTIMING]), 287 sizeof(dbt)); 288 err = can_get_bittiming(dev, &dbt, 289 priv->data_bittiming_const, 290 priv->data_bitrate_const, 291 priv->data_bitrate_const_cnt); 292 if (err) 293 return err; 294 295 if (priv->bitrate_max && dbt.bitrate > priv->bitrate_max) { 296 netdev_err(dev, "canfd data bitrate surpasses transceiver capabilities of %d bps\n", 297 priv->bitrate_max); 298 return -EINVAL; 299 } 300 301 memset(&priv->tdc, 0, sizeof(priv->tdc)); 302 if (data[IFLA_CAN_TDC]) { 303 /* TDC parameters are provided: use them */ 304 err = can_tdc_changelink(priv, data[IFLA_CAN_TDC], 305 extack); 306 if (err) { 307 priv->ctrlmode &= ~CAN_CTRLMODE_TDC_MASK; 308 return err; 309 } 310 } else if (!tdc_mask) { 311 /* Neither of TDC parameters nor TDC flags are 312 * provided: do calculation 313 */ 314 can_calc_tdco(&priv->tdc, priv->tdc_const, &priv->data_bittiming, 315 &priv->ctrlmode, priv->ctrlmode_supported); 316 } /* else: both CAN_CTRLMODE_TDC_{AUTO,MANUAL} are explicitly 317 * turned off. TDC is disabled: do nothing 318 */ 319 320 memcpy(&priv->data_bittiming, &dbt, sizeof(dbt)); 321 322 if (priv->do_set_data_bittiming) { 323 /* Finally, set the bit-timing registers */ 324 err = priv->do_set_data_bittiming(dev); 325 if (err) 326 return err; 327 } 328 } 329 330 if (data[IFLA_CAN_TERMINATION]) { 331 const u16 termval = nla_get_u16(data[IFLA_CAN_TERMINATION]); 332 const unsigned int num_term = priv->termination_const_cnt; 333 unsigned int i; 334 335 if (!priv->do_set_termination) 336 return -EOPNOTSUPP; 337 338 /* check whether given value is supported by the interface */ 339 for (i = 0; i < num_term; i++) { 340 if (termval == priv->termination_const[i]) 341 break; 342 } 343 if (i >= num_term) 344 return -EINVAL; 345 346 /* Finally, set the termination value */ 347 err = priv->do_set_termination(dev, termval); 348 if (err) 349 return err; 350 351 priv->termination = termval; 352 } 353 354 return 0; 355 } 356 357 static size_t can_tdc_get_size(const struct net_device *dev) 358 { 359 struct can_priv *priv = netdev_priv(dev); 360 size_t size; 361 362 if (!priv->tdc_const) 363 return 0; 364 365 size = nla_total_size(0); /* nest IFLA_CAN_TDC */ 366 if (priv->ctrlmode_supported & CAN_CTRLMODE_TDC_MANUAL) { 367 size += nla_total_size(sizeof(u32)); /* IFLA_CAN_TDCV_MIN */ 368 size += nla_total_size(sizeof(u32)); /* IFLA_CAN_TDCV_MAX */ 369 } 370 size += nla_total_size(sizeof(u32)); /* IFLA_CAN_TDCO_MIN */ 371 size += nla_total_size(sizeof(u32)); /* IFLA_CAN_TDCO_MAX */ 372 if (priv->tdc_const->tdcf_max) { 373 size += nla_total_size(sizeof(u32)); /* IFLA_CAN_TDCF_MIN */ 374 size += nla_total_size(sizeof(u32)); /* IFLA_CAN_TDCF_MAX */ 375 } 376 377 if (can_tdc_is_enabled(priv)) { 378 if (priv->ctrlmode & CAN_CTRLMODE_TDC_MANUAL || 379 priv->do_get_auto_tdcv) 380 size += nla_total_size(sizeof(u32)); /* IFLA_CAN_TDCV */ 381 size += nla_total_size(sizeof(u32)); /* IFLA_CAN_TDCO */ 382 if (priv->tdc_const->tdcf_max) 383 size += nla_total_size(sizeof(u32)); /* IFLA_CAN_TDCF */ 384 } 385 386 return size; 387 } 388 389 static size_t can_ctrlmode_ext_get_size(void) 390 { 391 return nla_total_size(0) + /* nest IFLA_CAN_CTRLMODE_EXT */ 392 nla_total_size(sizeof(u32)); /* IFLA_CAN_CTRLMODE_SUPPORTED */ 393 } 394 395 static size_t can_get_size(const struct net_device *dev) 396 { 397 struct can_priv *priv = netdev_priv(dev); 398 size_t size = 0; 399 400 if (priv->bittiming.bitrate) /* IFLA_CAN_BITTIMING */ 401 size += nla_total_size(sizeof(struct can_bittiming)); 402 if (priv->bittiming_const) /* IFLA_CAN_BITTIMING_CONST */ 403 size += nla_total_size(sizeof(struct can_bittiming_const)); 404 size += nla_total_size(sizeof(struct can_clock)); /* IFLA_CAN_CLOCK */ 405 size += nla_total_size(sizeof(u32)); /* IFLA_CAN_STATE */ 406 size += nla_total_size(sizeof(struct can_ctrlmode)); /* IFLA_CAN_CTRLMODE */ 407 size += nla_total_size(sizeof(u32)); /* IFLA_CAN_RESTART_MS */ 408 if (priv->do_get_berr_counter) /* IFLA_CAN_BERR_COUNTER */ 409 size += nla_total_size(sizeof(struct can_berr_counter)); 410 if (priv->data_bittiming.bitrate) /* IFLA_CAN_DATA_BITTIMING */ 411 size += nla_total_size(sizeof(struct can_bittiming)); 412 if (priv->data_bittiming_const) /* IFLA_CAN_DATA_BITTIMING_CONST */ 413 size += nla_total_size(sizeof(struct can_bittiming_const)); 414 if (priv->termination_const) { 415 size += nla_total_size(sizeof(priv->termination)); /* IFLA_CAN_TERMINATION */ 416 size += nla_total_size(sizeof(*priv->termination_const) * /* IFLA_CAN_TERMINATION_CONST */ 417 priv->termination_const_cnt); 418 } 419 if (priv->bitrate_const) /* IFLA_CAN_BITRATE_CONST */ 420 size += nla_total_size(sizeof(*priv->bitrate_const) * 421 priv->bitrate_const_cnt); 422 if (priv->data_bitrate_const) /* IFLA_CAN_DATA_BITRATE_CONST */ 423 size += nla_total_size(sizeof(*priv->data_bitrate_const) * 424 priv->data_bitrate_const_cnt); 425 size += sizeof(priv->bitrate_max); /* IFLA_CAN_BITRATE_MAX */ 426 size += can_tdc_get_size(dev); /* IFLA_CAN_TDC */ 427 size += can_ctrlmode_ext_get_size(); /* IFLA_CAN_CTRLMODE_EXT */ 428 429 return size; 430 } 431 432 static int can_tdc_fill_info(struct sk_buff *skb, const struct net_device *dev) 433 { 434 struct nlattr *nest; 435 struct can_priv *priv = netdev_priv(dev); 436 struct can_tdc *tdc = &priv->tdc; 437 const struct can_tdc_const *tdc_const = priv->tdc_const; 438 439 if (!tdc_const) 440 return 0; 441 442 nest = nla_nest_start(skb, IFLA_CAN_TDC); 443 if (!nest) 444 return -EMSGSIZE; 445 446 if (priv->ctrlmode_supported & CAN_CTRLMODE_TDC_MANUAL && 447 (nla_put_u32(skb, IFLA_CAN_TDC_TDCV_MIN, tdc_const->tdcv_min) || 448 nla_put_u32(skb, IFLA_CAN_TDC_TDCV_MAX, tdc_const->tdcv_max))) 449 goto err_cancel; 450 if (nla_put_u32(skb, IFLA_CAN_TDC_TDCO_MIN, tdc_const->tdco_min) || 451 nla_put_u32(skb, IFLA_CAN_TDC_TDCO_MAX, tdc_const->tdco_max)) 452 goto err_cancel; 453 if (tdc_const->tdcf_max && 454 (nla_put_u32(skb, IFLA_CAN_TDC_TDCF_MIN, tdc_const->tdcf_min) || 455 nla_put_u32(skb, IFLA_CAN_TDC_TDCF_MAX, tdc_const->tdcf_max))) 456 goto err_cancel; 457 458 if (can_tdc_is_enabled(priv)) { 459 u32 tdcv; 460 int err = -EINVAL; 461 462 if (priv->ctrlmode & CAN_CTRLMODE_TDC_MANUAL) { 463 tdcv = tdc->tdcv; 464 err = 0; 465 } else if (priv->do_get_auto_tdcv) { 466 err = priv->do_get_auto_tdcv(dev, &tdcv); 467 } 468 if (!err && nla_put_u32(skb, IFLA_CAN_TDC_TDCV, tdcv)) 469 goto err_cancel; 470 if (nla_put_u32(skb, IFLA_CAN_TDC_TDCO, tdc->tdco)) 471 goto err_cancel; 472 if (tdc_const->tdcf_max && 473 nla_put_u32(skb, IFLA_CAN_TDC_TDCF, tdc->tdcf)) 474 goto err_cancel; 475 } 476 477 nla_nest_end(skb, nest); 478 return 0; 479 480 err_cancel: 481 nla_nest_cancel(skb, nest); 482 return -EMSGSIZE; 483 } 484 485 static int can_ctrlmode_ext_fill_info(struct sk_buff *skb, 486 const struct can_priv *priv) 487 { 488 struct nlattr *nest; 489 490 nest = nla_nest_start(skb, IFLA_CAN_CTRLMODE_EXT); 491 if (!nest) 492 return -EMSGSIZE; 493 494 if (nla_put_u32(skb, IFLA_CAN_CTRLMODE_SUPPORTED, 495 priv->ctrlmode_supported)) { 496 nla_nest_cancel(skb, nest); 497 return -EMSGSIZE; 498 } 499 500 nla_nest_end(skb, nest); 501 return 0; 502 } 503 504 static int can_fill_info(struct sk_buff *skb, const struct net_device *dev) 505 { 506 struct can_priv *priv = netdev_priv(dev); 507 struct can_ctrlmode cm = {.flags = priv->ctrlmode}; 508 struct can_berr_counter bec = { }; 509 enum can_state state = priv->state; 510 511 if (priv->do_get_state) 512 priv->do_get_state(dev, &state); 513 514 if ((priv->bittiming.bitrate && 515 nla_put(skb, IFLA_CAN_BITTIMING, 516 sizeof(priv->bittiming), &priv->bittiming)) || 517 518 (priv->bittiming_const && 519 nla_put(skb, IFLA_CAN_BITTIMING_CONST, 520 sizeof(*priv->bittiming_const), priv->bittiming_const)) || 521 522 nla_put(skb, IFLA_CAN_CLOCK, sizeof(priv->clock), &priv->clock) || 523 nla_put_u32(skb, IFLA_CAN_STATE, state) || 524 nla_put(skb, IFLA_CAN_CTRLMODE, sizeof(cm), &cm) || 525 nla_put_u32(skb, IFLA_CAN_RESTART_MS, priv->restart_ms) || 526 527 (priv->do_get_berr_counter && 528 !priv->do_get_berr_counter(dev, &bec) && 529 nla_put(skb, IFLA_CAN_BERR_COUNTER, sizeof(bec), &bec)) || 530 531 (priv->data_bittiming.bitrate && 532 nla_put(skb, IFLA_CAN_DATA_BITTIMING, 533 sizeof(priv->data_bittiming), &priv->data_bittiming)) || 534 535 (priv->data_bittiming_const && 536 nla_put(skb, IFLA_CAN_DATA_BITTIMING_CONST, 537 sizeof(*priv->data_bittiming_const), 538 priv->data_bittiming_const)) || 539 540 (priv->termination_const && 541 (nla_put_u16(skb, IFLA_CAN_TERMINATION, priv->termination) || 542 nla_put(skb, IFLA_CAN_TERMINATION_CONST, 543 sizeof(*priv->termination_const) * 544 priv->termination_const_cnt, 545 priv->termination_const))) || 546 547 (priv->bitrate_const && 548 nla_put(skb, IFLA_CAN_BITRATE_CONST, 549 sizeof(*priv->bitrate_const) * 550 priv->bitrate_const_cnt, 551 priv->bitrate_const)) || 552 553 (priv->data_bitrate_const && 554 nla_put(skb, IFLA_CAN_DATA_BITRATE_CONST, 555 sizeof(*priv->data_bitrate_const) * 556 priv->data_bitrate_const_cnt, 557 priv->data_bitrate_const)) || 558 559 (nla_put(skb, IFLA_CAN_BITRATE_MAX, 560 sizeof(priv->bitrate_max), 561 &priv->bitrate_max)) || 562 563 can_tdc_fill_info(skb, dev) || 564 565 can_ctrlmode_ext_fill_info(skb, priv) 566 ) 567 568 return -EMSGSIZE; 569 570 return 0; 571 } 572 573 static size_t can_get_xstats_size(const struct net_device *dev) 574 { 575 return sizeof(struct can_device_stats); 576 } 577 578 static int can_fill_xstats(struct sk_buff *skb, const struct net_device *dev) 579 { 580 struct can_priv *priv = netdev_priv(dev); 581 582 if (nla_put(skb, IFLA_INFO_XSTATS, 583 sizeof(priv->can_stats), &priv->can_stats)) 584 goto nla_put_failure; 585 return 0; 586 587 nla_put_failure: 588 return -EMSGSIZE; 589 } 590 591 static int can_newlink(struct net *src_net, struct net_device *dev, 592 struct nlattr *tb[], struct nlattr *data[], 593 struct netlink_ext_ack *extack) 594 { 595 return -EOPNOTSUPP; 596 } 597 598 static void can_dellink(struct net_device *dev, struct list_head *head) 599 { 600 } 601 602 struct rtnl_link_ops can_link_ops __read_mostly = { 603 .kind = "can", 604 .netns_refund = true, 605 .maxtype = IFLA_CAN_MAX, 606 .policy = can_policy, 607 .setup = can_setup, 608 .validate = can_validate, 609 .newlink = can_newlink, 610 .changelink = can_changelink, 611 .dellink = can_dellink, 612 .get_size = can_get_size, 613 .fill_info = can_fill_info, 614 .get_xstats_size = can_get_xstats_size, 615 .fill_xstats = can_fill_xstats, 616 }; 617 618 int can_netlink_register(void) 619 { 620 return rtnl_link_register(&can_link_ops); 621 } 622 623 void can_netlink_unregister(void) 624 { 625 rtnl_link_unregister(&can_link_ops); 626 } 627