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_bittiming(const struct can_bittiming *bt, 40 struct netlink_ext_ack *extack) 41 { 42 /* sample point is in one-tenth of a percent */ 43 if (bt->sample_point >= 1000) { 44 NL_SET_ERR_MSG(extack, "sample point must be between 0 and 100%"); 45 46 return -EINVAL; 47 } 48 49 return 0; 50 } 51 52 static int can_validate(struct nlattr *tb[], struct nlattr *data[], 53 struct netlink_ext_ack *extack) 54 { 55 bool is_can_fd = false; 56 int err; 57 58 /* Make sure that valid CAN FD configurations always consist of 59 * - nominal/arbitration bittiming 60 * - data bittiming 61 * - control mode with CAN_CTRLMODE_FD set 62 * - TDC parameters are coherent (details below) 63 */ 64 65 if (!data) 66 return 0; 67 68 if (data[IFLA_CAN_BITTIMING]) { 69 struct can_bittiming bt; 70 71 memcpy(&bt, nla_data(data[IFLA_CAN_BITTIMING]), sizeof(bt)); 72 err = can_validate_bittiming(&bt, extack); 73 if (err) 74 return err; 75 } 76 77 if (data[IFLA_CAN_CTRLMODE]) { 78 struct can_ctrlmode *cm = nla_data(data[IFLA_CAN_CTRLMODE]); 79 u32 tdc_flags = cm->flags & CAN_CTRLMODE_TDC_MASK; 80 81 is_can_fd = cm->flags & cm->mask & CAN_CTRLMODE_FD; 82 83 /* CAN_CTRLMODE_TDC_{AUTO,MANUAL} are mutually exclusive */ 84 if (tdc_flags == CAN_CTRLMODE_TDC_MASK) 85 return -EOPNOTSUPP; 86 /* If one of the CAN_CTRLMODE_TDC_* flag is set then 87 * TDC must be set and vice-versa 88 */ 89 if (!!tdc_flags != !!data[IFLA_CAN_TDC]) 90 return -EOPNOTSUPP; 91 /* If providing TDC parameters, at least TDCO is 92 * needed. TDCV is needed if and only if 93 * CAN_CTRLMODE_TDC_MANUAL is set 94 */ 95 if (data[IFLA_CAN_TDC]) { 96 struct nlattr *tb_tdc[IFLA_CAN_TDC_MAX + 1]; 97 98 err = nla_parse_nested(tb_tdc, IFLA_CAN_TDC_MAX, 99 data[IFLA_CAN_TDC], 100 can_tdc_policy, extack); 101 if (err) 102 return err; 103 104 if (tb_tdc[IFLA_CAN_TDC_TDCV]) { 105 if (tdc_flags & CAN_CTRLMODE_TDC_AUTO) 106 return -EOPNOTSUPP; 107 } else { 108 if (tdc_flags & CAN_CTRLMODE_TDC_MANUAL) 109 return -EOPNOTSUPP; 110 } 111 112 if (!tb_tdc[IFLA_CAN_TDC_TDCO]) 113 return -EOPNOTSUPP; 114 } 115 } 116 117 if (is_can_fd) { 118 if (!data[IFLA_CAN_BITTIMING] || !data[IFLA_CAN_DATA_BITTIMING]) 119 return -EOPNOTSUPP; 120 } 121 122 if (data[IFLA_CAN_DATA_BITTIMING] || data[IFLA_CAN_TDC]) { 123 if (!is_can_fd) 124 return -EOPNOTSUPP; 125 } 126 127 if (data[IFLA_CAN_DATA_BITTIMING]) { 128 struct can_bittiming bt; 129 130 memcpy(&bt, nla_data(data[IFLA_CAN_DATA_BITTIMING]), sizeof(bt)); 131 err = can_validate_bittiming(&bt, extack); 132 if (err) 133 return err; 134 } 135 136 return 0; 137 } 138 139 static int can_tdc_changelink(struct can_priv *priv, const struct nlattr *nla, 140 struct netlink_ext_ack *extack) 141 { 142 struct nlattr *tb_tdc[IFLA_CAN_TDC_MAX + 1]; 143 struct can_tdc tdc = { 0 }; 144 const struct can_tdc_const *tdc_const = priv->tdc_const; 145 int err; 146 147 if (!tdc_const || !can_tdc_is_enabled(priv)) 148 return -EOPNOTSUPP; 149 150 err = nla_parse_nested(tb_tdc, IFLA_CAN_TDC_MAX, nla, 151 can_tdc_policy, extack); 152 if (err) 153 return err; 154 155 if (tb_tdc[IFLA_CAN_TDC_TDCV]) { 156 u32 tdcv = nla_get_u32(tb_tdc[IFLA_CAN_TDC_TDCV]); 157 158 if (tdcv < tdc_const->tdcv_min || tdcv > tdc_const->tdcv_max) 159 return -EINVAL; 160 161 tdc.tdcv = tdcv; 162 } 163 164 if (tb_tdc[IFLA_CAN_TDC_TDCO]) { 165 u32 tdco = nla_get_u32(tb_tdc[IFLA_CAN_TDC_TDCO]); 166 167 if (tdco < tdc_const->tdco_min || tdco > tdc_const->tdco_max) 168 return -EINVAL; 169 170 tdc.tdco = tdco; 171 } 172 173 if (tb_tdc[IFLA_CAN_TDC_TDCF]) { 174 u32 tdcf = nla_get_u32(tb_tdc[IFLA_CAN_TDC_TDCF]); 175 176 if (tdcf < tdc_const->tdcf_min || tdcf > tdc_const->tdcf_max) 177 return -EINVAL; 178 179 tdc.tdcf = tdcf; 180 } 181 182 priv->tdc = tdc; 183 184 return 0; 185 } 186 187 static int can_changelink(struct net_device *dev, struct nlattr *tb[], 188 struct nlattr *data[], 189 struct netlink_ext_ack *extack) 190 { 191 struct can_priv *priv = netdev_priv(dev); 192 u32 tdc_mask = 0; 193 int err; 194 195 /* We need synchronization with dev->stop() */ 196 ASSERT_RTNL(); 197 198 if (data[IFLA_CAN_BITTIMING]) { 199 struct can_bittiming bt; 200 201 /* Do not allow changing bittiming while running */ 202 if (dev->flags & IFF_UP) 203 return -EBUSY; 204 205 /* Calculate bittiming parameters based on 206 * bittiming_const if set, otherwise pass bitrate 207 * directly via do_set_bitrate(). Bail out if neither 208 * is given. 209 */ 210 if (!priv->bittiming_const && !priv->do_set_bittiming && 211 !priv->bitrate_const) 212 return -EOPNOTSUPP; 213 214 memcpy(&bt, nla_data(data[IFLA_CAN_BITTIMING]), sizeof(bt)); 215 err = can_get_bittiming(dev, &bt, 216 priv->bittiming_const, 217 priv->bitrate_const, 218 priv->bitrate_const_cnt, 219 extack); 220 if (err) 221 return err; 222 223 if (priv->bitrate_max && bt.bitrate > priv->bitrate_max) { 224 NL_SET_ERR_MSG_FMT(extack, 225 "arbitration bitrate %u bps surpasses transceiver capabilities of %u bps", 226 bt.bitrate, priv->bitrate_max); 227 return -EINVAL; 228 } 229 230 memcpy(&priv->bittiming, &bt, sizeof(bt)); 231 232 if (priv->do_set_bittiming) { 233 /* Finally, set the bit-timing registers */ 234 err = priv->do_set_bittiming(dev); 235 if (err) 236 return err; 237 } 238 } 239 240 if (data[IFLA_CAN_CTRLMODE]) { 241 struct can_ctrlmode *cm; 242 u32 ctrlstatic; 243 u32 maskedflags; 244 245 /* Do not allow changing controller mode while running */ 246 if (dev->flags & IFF_UP) 247 return -EBUSY; 248 cm = nla_data(data[IFLA_CAN_CTRLMODE]); 249 ctrlstatic = can_get_static_ctrlmode(priv); 250 maskedflags = cm->flags & cm->mask; 251 252 /* check whether provided bits are allowed to be passed */ 253 if (maskedflags & ~(priv->ctrlmode_supported | ctrlstatic)) 254 return -EOPNOTSUPP; 255 256 /* do not check for static fd-non-iso if 'fd' is disabled */ 257 if (!(maskedflags & CAN_CTRLMODE_FD)) 258 ctrlstatic &= ~CAN_CTRLMODE_FD_NON_ISO; 259 260 /* make sure static options are provided by configuration */ 261 if ((maskedflags & ctrlstatic) != ctrlstatic) 262 return -EOPNOTSUPP; 263 264 /* clear bits to be modified and copy the flag values */ 265 priv->ctrlmode &= ~cm->mask; 266 priv->ctrlmode |= maskedflags; 267 268 /* CAN_CTRLMODE_FD can only be set when driver supports FD */ 269 if (priv->ctrlmode & CAN_CTRLMODE_FD) { 270 dev->mtu = CANFD_MTU; 271 } else { 272 dev->mtu = CAN_MTU; 273 memset(&priv->data_bittiming, 0, 274 sizeof(priv->data_bittiming)); 275 priv->ctrlmode &= ~CAN_CTRLMODE_TDC_MASK; 276 memset(&priv->tdc, 0, sizeof(priv->tdc)); 277 } 278 279 tdc_mask = cm->mask & CAN_CTRLMODE_TDC_MASK; 280 /* CAN_CTRLMODE_TDC_{AUTO,MANUAL} are mutually 281 * exclusive: make sure to turn the other one off 282 */ 283 if (tdc_mask) 284 priv->ctrlmode &= cm->flags | ~CAN_CTRLMODE_TDC_MASK; 285 } 286 287 if (data[IFLA_CAN_RESTART_MS]) { 288 /* Do not allow changing restart delay while running */ 289 if (dev->flags & IFF_UP) 290 return -EBUSY; 291 priv->restart_ms = nla_get_u32(data[IFLA_CAN_RESTART_MS]); 292 } 293 294 if (data[IFLA_CAN_RESTART]) { 295 /* Do not allow a restart while not running */ 296 if (!(dev->flags & IFF_UP)) 297 return -EINVAL; 298 err = can_restart_now(dev); 299 if (err) 300 return err; 301 } 302 303 if (data[IFLA_CAN_DATA_BITTIMING]) { 304 struct can_bittiming dbt; 305 306 /* Do not allow changing bittiming while running */ 307 if (dev->flags & IFF_UP) 308 return -EBUSY; 309 310 /* Calculate bittiming parameters based on 311 * data_bittiming_const if set, otherwise pass bitrate 312 * directly via do_set_bitrate(). Bail out if neither 313 * is given. 314 */ 315 if (!priv->data_bittiming_const && !priv->do_set_data_bittiming && 316 !priv->data_bitrate_const) 317 return -EOPNOTSUPP; 318 319 memcpy(&dbt, nla_data(data[IFLA_CAN_DATA_BITTIMING]), 320 sizeof(dbt)); 321 err = can_get_bittiming(dev, &dbt, 322 priv->data_bittiming_const, 323 priv->data_bitrate_const, 324 priv->data_bitrate_const_cnt, 325 extack); 326 if (err) 327 return err; 328 329 if (priv->bitrate_max && dbt.bitrate > priv->bitrate_max) { 330 NL_SET_ERR_MSG_FMT(extack, 331 "CANFD data bitrate %u bps surpasses transceiver capabilities of %u bps", 332 dbt.bitrate, priv->bitrate_max); 333 return -EINVAL; 334 } 335 336 memset(&priv->tdc, 0, sizeof(priv->tdc)); 337 if (data[IFLA_CAN_TDC]) { 338 /* TDC parameters are provided: use them */ 339 err = can_tdc_changelink(priv, data[IFLA_CAN_TDC], 340 extack); 341 if (err) { 342 priv->ctrlmode &= ~CAN_CTRLMODE_TDC_MASK; 343 return err; 344 } 345 } else if (!tdc_mask) { 346 /* Neither of TDC parameters nor TDC flags are 347 * provided: do calculation 348 */ 349 can_calc_tdco(&priv->tdc, priv->tdc_const, &dbt, 350 &priv->ctrlmode, priv->ctrlmode_supported); 351 } /* else: both CAN_CTRLMODE_TDC_{AUTO,MANUAL} are explicitly 352 * turned off. TDC is disabled: do nothing 353 */ 354 355 memcpy(&priv->data_bittiming, &dbt, sizeof(dbt)); 356 357 if (priv->do_set_data_bittiming) { 358 /* Finally, set the bit-timing registers */ 359 err = priv->do_set_data_bittiming(dev); 360 if (err) 361 return err; 362 } 363 } 364 365 if (data[IFLA_CAN_TERMINATION]) { 366 const u16 termval = nla_get_u16(data[IFLA_CAN_TERMINATION]); 367 const unsigned int num_term = priv->termination_const_cnt; 368 unsigned int i; 369 370 if (!priv->do_set_termination) 371 return -EOPNOTSUPP; 372 373 /* check whether given value is supported by the interface */ 374 for (i = 0; i < num_term; i++) { 375 if (termval == priv->termination_const[i]) 376 break; 377 } 378 if (i >= num_term) 379 return -EINVAL; 380 381 /* Finally, set the termination value */ 382 err = priv->do_set_termination(dev, termval); 383 if (err) 384 return err; 385 386 priv->termination = termval; 387 } 388 389 return 0; 390 } 391 392 static size_t can_tdc_get_size(const struct net_device *dev) 393 { 394 struct can_priv *priv = netdev_priv(dev); 395 size_t size; 396 397 if (!priv->tdc_const) 398 return 0; 399 400 size = nla_total_size(0); /* nest IFLA_CAN_TDC */ 401 if (priv->ctrlmode_supported & CAN_CTRLMODE_TDC_MANUAL) { 402 size += nla_total_size(sizeof(u32)); /* IFLA_CAN_TDCV_MIN */ 403 size += nla_total_size(sizeof(u32)); /* IFLA_CAN_TDCV_MAX */ 404 } 405 size += nla_total_size(sizeof(u32)); /* IFLA_CAN_TDCO_MIN */ 406 size += nla_total_size(sizeof(u32)); /* IFLA_CAN_TDCO_MAX */ 407 if (priv->tdc_const->tdcf_max) { 408 size += nla_total_size(sizeof(u32)); /* IFLA_CAN_TDCF_MIN */ 409 size += nla_total_size(sizeof(u32)); /* IFLA_CAN_TDCF_MAX */ 410 } 411 412 if (can_tdc_is_enabled(priv)) { 413 if (priv->ctrlmode & CAN_CTRLMODE_TDC_MANUAL || 414 priv->do_get_auto_tdcv) 415 size += nla_total_size(sizeof(u32)); /* IFLA_CAN_TDCV */ 416 size += nla_total_size(sizeof(u32)); /* IFLA_CAN_TDCO */ 417 if (priv->tdc_const->tdcf_max) 418 size += nla_total_size(sizeof(u32)); /* IFLA_CAN_TDCF */ 419 } 420 421 return size; 422 } 423 424 static size_t can_ctrlmode_ext_get_size(void) 425 { 426 return nla_total_size(0) + /* nest IFLA_CAN_CTRLMODE_EXT */ 427 nla_total_size(sizeof(u32)); /* IFLA_CAN_CTRLMODE_SUPPORTED */ 428 } 429 430 static size_t can_get_size(const struct net_device *dev) 431 { 432 struct can_priv *priv = netdev_priv(dev); 433 size_t size = 0; 434 435 if (priv->bittiming.bitrate) /* IFLA_CAN_BITTIMING */ 436 size += nla_total_size(sizeof(struct can_bittiming)); 437 if (priv->bittiming_const) /* IFLA_CAN_BITTIMING_CONST */ 438 size += nla_total_size(sizeof(struct can_bittiming_const)); 439 size += nla_total_size(sizeof(struct can_clock)); /* IFLA_CAN_CLOCK */ 440 size += nla_total_size(sizeof(u32)); /* IFLA_CAN_STATE */ 441 size += nla_total_size(sizeof(struct can_ctrlmode)); /* IFLA_CAN_CTRLMODE */ 442 size += nla_total_size(sizeof(u32)); /* IFLA_CAN_RESTART_MS */ 443 if (priv->do_get_berr_counter) /* IFLA_CAN_BERR_COUNTER */ 444 size += nla_total_size(sizeof(struct can_berr_counter)); 445 if (priv->data_bittiming.bitrate) /* IFLA_CAN_DATA_BITTIMING */ 446 size += nla_total_size(sizeof(struct can_bittiming)); 447 if (priv->data_bittiming_const) /* IFLA_CAN_DATA_BITTIMING_CONST */ 448 size += nla_total_size(sizeof(struct can_bittiming_const)); 449 if (priv->termination_const) { 450 size += nla_total_size(sizeof(priv->termination)); /* IFLA_CAN_TERMINATION */ 451 size += nla_total_size(sizeof(*priv->termination_const) * /* IFLA_CAN_TERMINATION_CONST */ 452 priv->termination_const_cnt); 453 } 454 if (priv->bitrate_const) /* IFLA_CAN_BITRATE_CONST */ 455 size += nla_total_size(sizeof(*priv->bitrate_const) * 456 priv->bitrate_const_cnt); 457 if (priv->data_bitrate_const) /* IFLA_CAN_DATA_BITRATE_CONST */ 458 size += nla_total_size(sizeof(*priv->data_bitrate_const) * 459 priv->data_bitrate_const_cnt); 460 size += sizeof(priv->bitrate_max); /* IFLA_CAN_BITRATE_MAX */ 461 size += can_tdc_get_size(dev); /* IFLA_CAN_TDC */ 462 size += can_ctrlmode_ext_get_size(); /* IFLA_CAN_CTRLMODE_EXT */ 463 464 return size; 465 } 466 467 static int can_tdc_fill_info(struct sk_buff *skb, const struct net_device *dev) 468 { 469 struct nlattr *nest; 470 struct can_priv *priv = netdev_priv(dev); 471 struct can_tdc *tdc = &priv->tdc; 472 const struct can_tdc_const *tdc_const = priv->tdc_const; 473 474 if (!tdc_const) 475 return 0; 476 477 nest = nla_nest_start(skb, IFLA_CAN_TDC); 478 if (!nest) 479 return -EMSGSIZE; 480 481 if (priv->ctrlmode_supported & CAN_CTRLMODE_TDC_MANUAL && 482 (nla_put_u32(skb, IFLA_CAN_TDC_TDCV_MIN, tdc_const->tdcv_min) || 483 nla_put_u32(skb, IFLA_CAN_TDC_TDCV_MAX, tdc_const->tdcv_max))) 484 goto err_cancel; 485 if (nla_put_u32(skb, IFLA_CAN_TDC_TDCO_MIN, tdc_const->tdco_min) || 486 nla_put_u32(skb, IFLA_CAN_TDC_TDCO_MAX, tdc_const->tdco_max)) 487 goto err_cancel; 488 if (tdc_const->tdcf_max && 489 (nla_put_u32(skb, IFLA_CAN_TDC_TDCF_MIN, tdc_const->tdcf_min) || 490 nla_put_u32(skb, IFLA_CAN_TDC_TDCF_MAX, tdc_const->tdcf_max))) 491 goto err_cancel; 492 493 if (can_tdc_is_enabled(priv)) { 494 u32 tdcv; 495 int err = -EINVAL; 496 497 if (priv->ctrlmode & CAN_CTRLMODE_TDC_MANUAL) { 498 tdcv = tdc->tdcv; 499 err = 0; 500 } else if (priv->do_get_auto_tdcv) { 501 err = priv->do_get_auto_tdcv(dev, &tdcv); 502 } 503 if (!err && nla_put_u32(skb, IFLA_CAN_TDC_TDCV, tdcv)) 504 goto err_cancel; 505 if (nla_put_u32(skb, IFLA_CAN_TDC_TDCO, tdc->tdco)) 506 goto err_cancel; 507 if (tdc_const->tdcf_max && 508 nla_put_u32(skb, IFLA_CAN_TDC_TDCF, tdc->tdcf)) 509 goto err_cancel; 510 } 511 512 nla_nest_end(skb, nest); 513 return 0; 514 515 err_cancel: 516 nla_nest_cancel(skb, nest); 517 return -EMSGSIZE; 518 } 519 520 static int can_ctrlmode_ext_fill_info(struct sk_buff *skb, 521 const struct can_priv *priv) 522 { 523 struct nlattr *nest; 524 525 nest = nla_nest_start(skb, IFLA_CAN_CTRLMODE_EXT); 526 if (!nest) 527 return -EMSGSIZE; 528 529 if (nla_put_u32(skb, IFLA_CAN_CTRLMODE_SUPPORTED, 530 priv->ctrlmode_supported)) { 531 nla_nest_cancel(skb, nest); 532 return -EMSGSIZE; 533 } 534 535 nla_nest_end(skb, nest); 536 return 0; 537 } 538 539 static int can_fill_info(struct sk_buff *skb, const struct net_device *dev) 540 { 541 struct can_priv *priv = netdev_priv(dev); 542 struct can_ctrlmode cm = {.flags = priv->ctrlmode}; 543 struct can_berr_counter bec = { }; 544 enum can_state state = priv->state; 545 546 if (priv->do_get_state) 547 priv->do_get_state(dev, &state); 548 549 if ((priv->bittiming.bitrate != CAN_BITRATE_UNSET && 550 priv->bittiming.bitrate != CAN_BITRATE_UNKNOWN && 551 nla_put(skb, IFLA_CAN_BITTIMING, 552 sizeof(priv->bittiming), &priv->bittiming)) || 553 554 (priv->bittiming_const && 555 nla_put(skb, IFLA_CAN_BITTIMING_CONST, 556 sizeof(*priv->bittiming_const), priv->bittiming_const)) || 557 558 nla_put(skb, IFLA_CAN_CLOCK, sizeof(priv->clock), &priv->clock) || 559 nla_put_u32(skb, IFLA_CAN_STATE, state) || 560 nla_put(skb, IFLA_CAN_CTRLMODE, sizeof(cm), &cm) || 561 nla_put_u32(skb, IFLA_CAN_RESTART_MS, priv->restart_ms) || 562 563 (priv->do_get_berr_counter && 564 !priv->do_get_berr_counter(dev, &bec) && 565 nla_put(skb, IFLA_CAN_BERR_COUNTER, sizeof(bec), &bec)) || 566 567 (priv->data_bittiming.bitrate && 568 nla_put(skb, IFLA_CAN_DATA_BITTIMING, 569 sizeof(priv->data_bittiming), &priv->data_bittiming)) || 570 571 (priv->data_bittiming_const && 572 nla_put(skb, IFLA_CAN_DATA_BITTIMING_CONST, 573 sizeof(*priv->data_bittiming_const), 574 priv->data_bittiming_const)) || 575 576 (priv->termination_const && 577 (nla_put_u16(skb, IFLA_CAN_TERMINATION, priv->termination) || 578 nla_put(skb, IFLA_CAN_TERMINATION_CONST, 579 sizeof(*priv->termination_const) * 580 priv->termination_const_cnt, 581 priv->termination_const))) || 582 583 (priv->bitrate_const && 584 nla_put(skb, IFLA_CAN_BITRATE_CONST, 585 sizeof(*priv->bitrate_const) * 586 priv->bitrate_const_cnt, 587 priv->bitrate_const)) || 588 589 (priv->data_bitrate_const && 590 nla_put(skb, IFLA_CAN_DATA_BITRATE_CONST, 591 sizeof(*priv->data_bitrate_const) * 592 priv->data_bitrate_const_cnt, 593 priv->data_bitrate_const)) || 594 595 (nla_put(skb, IFLA_CAN_BITRATE_MAX, 596 sizeof(priv->bitrate_max), 597 &priv->bitrate_max)) || 598 599 can_tdc_fill_info(skb, dev) || 600 601 can_ctrlmode_ext_fill_info(skb, priv) 602 ) 603 604 return -EMSGSIZE; 605 606 return 0; 607 } 608 609 static size_t can_get_xstats_size(const struct net_device *dev) 610 { 611 return sizeof(struct can_device_stats); 612 } 613 614 static int can_fill_xstats(struct sk_buff *skb, const struct net_device *dev) 615 { 616 struct can_priv *priv = netdev_priv(dev); 617 618 if (nla_put(skb, IFLA_INFO_XSTATS, 619 sizeof(priv->can_stats), &priv->can_stats)) 620 goto nla_put_failure; 621 return 0; 622 623 nla_put_failure: 624 return -EMSGSIZE; 625 } 626 627 static int can_newlink(struct net *src_net, struct net_device *dev, 628 struct nlattr *tb[], struct nlattr *data[], 629 struct netlink_ext_ack *extack) 630 { 631 return -EOPNOTSUPP; 632 } 633 634 static void can_dellink(struct net_device *dev, struct list_head *head) 635 { 636 } 637 638 struct rtnl_link_ops can_link_ops __read_mostly = { 639 .kind = "can", 640 .netns_refund = true, 641 .maxtype = IFLA_CAN_MAX, 642 .policy = can_policy, 643 .setup = can_setup, 644 .validate = can_validate, 645 .newlink = can_newlink, 646 .changelink = can_changelink, 647 .dellink = can_dellink, 648 .get_size = can_get_size, 649 .fill_info = can_fill_info, 650 .get_xstats_size = can_get_xstats_size, 651 .fill_xstats = can_fill_xstats, 652 }; 653 654 int can_netlink_register(void) 655 { 656 return rtnl_link_register(&can_link_ops); 657 } 658 659 void can_netlink_unregister(void) 660 { 661 rtnl_link_unregister(&can_link_ops); 662 } 663