// SPDX-License-Identifier: GPL-2.0-only
/* Copyright (C) 2005 Marc Kleine-Budde, Pengutronix
* Copyright (C) 2006 Andrey Volkov, Varma Electronics
* Copyright (C) 2008-2009 Wolfgang Grandegger <wg@grandegger.com>
* Copyright (C) 2021-2025 Vincent Mailhol <mailhol@kernel.org>
*/
#include <linux/can/dev.h>
#include <net/rtnetlink.h>
static const struct nla_policy can_policy[IFLA_CAN_MAX + 1] = {
[IFLA_CAN_STATE] = { .type = NLA_U32 },
[IFLA_CAN_CTRLMODE] = { .len = sizeof(struct can_ctrlmode) },
[IFLA_CAN_RESTART_MS] = { .type = NLA_U32 },
[IFLA_CAN_RESTART] = { .type = NLA_U32 },
[IFLA_CAN_BITTIMING] = { .len = sizeof(struct can_bittiming) },
[IFLA_CAN_BITTIMING_CONST] = { .len = sizeof(struct can_bittiming_const) },
[IFLA_CAN_CLOCK] = { .len = sizeof(struct can_clock) },
[IFLA_CAN_BERR_COUNTER] = { .len = sizeof(struct can_berr_counter) },
[IFLA_CAN_DATA_BITTIMING] = { .len = sizeof(struct can_bittiming) },
[IFLA_CAN_DATA_BITTIMING_CONST] = { .len = sizeof(struct can_bittiming_const) },
[IFLA_CAN_TERMINATION] = { .type = NLA_U16 },
[IFLA_CAN_TDC] = { .type = NLA_NESTED },
[IFLA_CAN_CTRLMODE_EXT] = { .type = NLA_NESTED },
[IFLA_CAN_XL_DATA_BITTIMING] = { .len = sizeof(struct can_bittiming) },
[IFLA_CAN_XL_DATA_BITTIMING_CONST] = { .len = sizeof(struct can_bittiming_const) },
[IFLA_CAN_XL_TDC] = { .type = NLA_NESTED },
[IFLA_CAN_XL_PWM] = { .type = NLA_NESTED },
};
static const struct nla_policy can_tdc_policy[IFLA_CAN_TDC_MAX + 1] = {
[IFLA_CAN_TDC_TDCV_MIN] = { .type = NLA_U32 },
[IFLA_CAN_TDC_TDCV_MAX] = { .type = NLA_U32 },
[IFLA_CAN_TDC_TDCO_MIN] = { .type = NLA_U32 },
[IFLA_CAN_TDC_TDCO_MAX] = { .type = NLA_U32 },
[IFLA_CAN_TDC_TDCF_MIN] = { .type = NLA_U32 },
[IFLA_CAN_TDC_TDCF_MAX] = { .type = NLA_U32 },
[IFLA_CAN_TDC_TDCV] = { .type = NLA_U32 },
[IFLA_CAN_TDC_TDCO] = { .type = NLA_U32 },
[IFLA_CAN_TDC_TDCF] = { .type = NLA_U32 },
};
static const struct nla_policy can_pwm_policy[IFLA_CAN_PWM_MAX + 1] = {
[IFLA_CAN_PWM_PWMS_MIN] = { .type = NLA_U32 },
[IFLA_CAN_PWM_PWMS_MAX] = { .type = NLA_U32 },
[IFLA_CAN_PWM_PWML_MIN] = { .type = NLA_U32 },
[IFLA_CAN_PWM_PWML_MAX] = { .type = NLA_U32 },
[IFLA_CAN_PWM_PWMO_MIN] = { .type = NLA_U32 },
[IFLA_CAN_PWM_PWMO_MAX] = { .type = NLA_U32 },
[IFLA_CAN_PWM_PWMS] = { .type = NLA_U32 },
[IFLA_CAN_PWM_PWML] = { .type = NLA_U32 },
[IFLA_CAN_PWM_PWMO] = { .type = NLA_U32 },
};
static int can_validate_bittiming(struct nlattr *data[],
struct netlink_ext_ack *extack,
int ifla_can_bittiming)
{
struct can_bittiming *bt;
if (!data[ifla_can_bittiming])
return 0;
static_assert(__alignof__(*bt) <= NLA_ALIGNTO);
bt = nla_data(data[ifla_can_bittiming]);
/* sample point is in one-tenth of a percent */
if (bt->sample_point >= 1000) {
NL_SET_ERR_MSG(extack, "sample point must be between 0 and 100%");
return -EINVAL;
}
return 0;
}
static int can_validate_tdc(struct nlattr *data_tdc,
struct netlink_ext_ack *extack, u32 tdc_flags)
{
bool tdc_manual = tdc_flags & CAN_CTRLMODE_TDC_MANUAL_MASK;
bool tdc_auto = tdc_flags & CAN_CTRLMODE_TDC_AUTO_MASK;
int err;
if (tdc_auto && tdc_manual) {
NL_SET_ERR_MSG(extack,
"TDC manual and auto modes are mutually exclusive");
return -EOPNOTSUPP;
}
/* If one of the CAN_CTRLMODE_{,XL}_TDC_* flags is set then TDC
* must be set and vice-versa
*/
if ((tdc_auto || tdc_manual) && !data_tdc) {
NL_SET_ERR_MSG(extack, "TDC parameters are missing");
return -EOPNOTSUPP;
}
if (!(tdc_auto || tdc_manual) && data_tdc) {
NL_SET_ERR_MSG(extack, "TDC mode (auto or manual) is missing");
return -EOPNOTSUPP;
}
/* If providing TDC parameters, at least TDCO is needed. TDCV is
* needed if and only if CAN_CTRLMODE_{,XL}_TDC_MANUAL is set
*/
if (data_tdc) {
struct nlattr *tb_tdc[IFLA_CAN_TDC_MAX + 1];
err = nla_parse_nested(tb_tdc, IFLA_CAN_TDC_MAX,
data_tdc, can_tdc_policy, extack);
if (err)
return err;
if (tb_tdc[IFLA_CAN_TDC_TDCV]) {
if (tdc_auto) {
NL_SET_ERR_MSG(extack,
"TDCV is incompatible with TDC auto mode");
return -EOPNOTSUPP;
}
} else {
if (tdc_manual) {
NL_SET_ERR_MSG(extack,
"TDC manual mode requires TDCV");
return -EOPNOTSUPP;
}
}
if (!tb_tdc[IFLA_CAN_TDC_TDCO]) {
NL_SET_ERR_MSG(extack, "TDCO is missing");
return -EOPNOTSUPP;
}
}
return 0;
}
static int can_validate_pwm(struct nlattr *data[],
struct netlink_ext_ack *extack, u32 flags)
{
struct nlattr *tb_pwm[IFLA_CAN_PWM_MAX + 1];
int err;
if (!data[IFLA_CAN_XL_PWM])
return 0;
if (!(flags & CAN_CTRLMODE_XL_TMS)) {
NL_SET_ERR_MSG(extack, "PWM requires TMS");
return -EOPNOTSUPP;
}
err = nla_parse_nested(tb_pwm, IFLA_CAN_PWM_MAX, data[IFLA_CAN_XL_PWM],
can_pwm_policy, extack);
if (err)
return err;
if (!tb_pwm[IFLA_CAN_PWM_PWMS] != !tb_pwm[IFLA_CAN_PWM_PWML]) {
NL_SET_ERR_MSG(extack,
"Provide either both PWMS and PWML, or none for automatic calculation");
return -EOPNOTSUPP;
}
if (tb_pwm[IFLA_CAN_PWM_PWMO] &&
(!tb_pwm[IFLA_CAN_PWM_PWMS] || !tb_pwm[IFLA_CAN_PWM_PWML])) {
NL_SET_ERR_MSG(extack, "PWMO requires both PWMS and PWML");
return -EOPNOTSUPP;
}
return 0;
}
static int can_validate_databittiming(struct nlattr *data[],
struct netlink_ext_ack *extack,
int ifla_can_data_bittiming, u32 flags)
{
struct nlattr *data_tdc;
const char *type;
u32 tdc_flags;
bool is_on;
int err;
/* Make sure that valid CAN FD/XL configurations always consist of
* - nominal/arbitration bittiming
* - data bittiming
* - control mode with CAN_CTRLMODE_{FD,XL} set
* - TDC parameters are coherent (details in can_validate_tdc())
*/
if (ifla_can_data_bittiming == IFLA_CAN_DATA_BITTIMING) {
data_tdc = data[IFLA_CAN_TDC];
tdc_flags = flags & CAN_CTRLMODE_FD_TDC_MASK;
is_on = flags & CAN_CTRLMODE_FD;
type = "FD";
} else {
data_tdc = data[IFLA_CAN_XL_TDC];
tdc_flags = flags & CAN_CTRLMODE_XL_TDC_MASK;
is_on = flags & CAN_CTRLMODE_XL;
type = "XL";
}
if (is_on) {
if (!data[IFLA_CAN_BITTIMING] || !data[ifla_can_data_bittiming]) {
NL_SET_ERR_MSG_FMT(extack,
"Provide both nominal and %s data bittiming",
type);
return -EOPNOTSUPP;
}
} else {
if (data[ifla_can_data_bittiming]) {
NL_SET_ERR_MSG_FMT(extack,
"%s data bittiming requires CAN %s",
type, type);
return -EOPNOTSUPP;
}
if (data_tdc) {
NL_SET_ERR_MSG_FMT(extack,
"%s TDC requires CAN %s",
type, type);
return -EOPNOTSUPP;
}
}
err = can_validate_bittiming(data, extack, ifla_can_data_bittiming);
if (err)
return err;
err = can_validate_tdc(data_tdc, extack, tdc_flags);
if (err)
return err;
return 0;
}
static int can_validate_xl_flags(struct netlink_ext_ack *extack,
u32 masked_flags, u32 mask)
{
if (masked_flags & CAN_CTRLMODE_XL) {
if (masked_flags & CAN_CTRLMODE_XL_TMS) {
const u32 tms_conflicts_mask = CAN_CTRLMODE_FD |
CAN_CTRLMODE_XL_TDC_MASK;
u32 tms_conflicts = masked_flags & tms_conflicts_mask;
if (tms_conflicts) {
NL_SET_ERR_MSG_FMT(extack,
"TMS and %s are mutually exclusive",
can_get_ctrlmode_str(tms_conflicts));
return -EOPNOTSUPP;
}
}
} else {
if (mask & CAN_CTRLMODE_XL_TMS) {
NL_SET_ERR_MSG(extack, "TMS requires CAN XL");
return -EOPNOTSUPP;
}
}
return 0;
}
static int can_validate(struct nlattr *tb[], struct nlattr *data[],
struct netlink_ext_ack *extack)
{
u32 flags = 0;
int err;
if (!data)
return 0;
if (data[IFLA_CAN_CTRLMODE]) {
struct can_ctrlmode *cm = nla_data(data[IFLA_CAN_CTRLMODE]);
flags = cm->flags & cm->mask;
if ((flags & CAN_CTRLMODE_LISTENONLY) &&
(flags & CAN_CTRLMODE_RESTRICTED)) {
NL_SET_ERR_MSG(extack,
"LISTEN-ONLY and RESTRICTED modes are mutually exclusive");
return -EOPNOTSUPP;
}
err = can_validate_xl_flags(extack, flags, cm->mask);
if (err)
return err;
}
err = can_validate_bittiming(data, extack, IFLA_CAN_BITTIMING);
if (err)
return err;
err = can_validate_databittiming(data, extack,
IFLA_CAN_DATA_BITTIMING, flags);
if (err)
return err;
err = can_validate_databittiming(data, extack,
IFLA_CAN_XL_DATA_BITTIMING, flags);
if (err)
return err;
err = can_validate_pwm(data, extack, flags);
if (err)
return err;
return 0;
}
static int can_ctrlmode_changelink(struct net_device *dev,
struct nlattr *data[],
struct netlink_ext_ack *extack)
{
struct can_priv *priv = netdev_priv(dev);
struct can_ctrlmode *cm;
u32 ctrlstatic, maskedflags, deactivated, notsupp, ctrlstatic_missing;
if (!data[IFLA_CAN_CTRLMODE])
return 0;
/* Do not allow changing controller mode while running */
if (dev->flags & IFF_UP)
return -EBUSY;
cm = nla_data(data[IFLA_CAN_CTRLMODE]);
ctrlstatic = can_get_static_ctrlmode(priv);
maskedflags = cm->flags & cm->mask;
deactivated = ~cm->flags & cm->mask;
notsupp = maskedflags & ~(priv->ctrlmode_supported | ctrlstatic);
ctrlstatic_missing = (maskedflags & ctrlstatic) ^ ctrlstatic;
if (notsupp) {
NL_SET_ERR_MSG_FMT(extack,
"requested control mode %s not supported",
can_get_ctrlmode_str(notsupp));
return -EOPNOTSUPP;
}
/* do not check for static fd-non-iso if 'fd' is disabled */
if (!(maskedflags & CAN_CTRLMODE_FD))
ctrlstatic &= ~CAN_CTRLMODE_FD_NON_ISO;
if (ctrlstatic_missing) {
NL_SET_ERR_MSG_FMT(extack,
"missing required %s static control mode",
can_get_ctrlmode_str(ctrlstatic_missing));
return -EOPNOTSUPP;
}
/* If FD was active and is not turned off, check for XL conflicts */
if (priv->ctrlmode & CAN_CTRLMODE_FD & ~deactivated) {
if (maskedflags & CAN_CTRLMODE_XL_TMS) {
NL_SET_ERR_MSG(extack,
"TMS can not be activated while CAN FD is on");
return -EOPNOTSUPP;
}
}
/* If a top dependency flag is provided, reset all its dependencies */
if (cm->mask & CAN_CTRLMODE_FD)
priv->ctrlmode &= ~CAN_CTRLMODE_FD_TDC_MASK;
if (cm->mask & CAN_CTRLMODE_XL)
priv->ctrlmode &= ~(CAN_CTRLMODE_XL_TDC_MASK |
CAN_CTRLMODE_XL_TMS);
/* clear bits to be modified and copy the flag values */
priv->ctrlmode &= ~cm->mask;
priv->ctrlmode |= maskedflags;
/* Wipe potential leftovers from previous CAN FD/XL config */
if (!(priv->ctrlmode & CAN_CTRLMODE_FD)) {
memset(&priv->fd.data_bittiming, 0,
sizeof(priv->fd.data_bittiming));
priv->ctrlmode &= ~CAN_CTRLMODE_FD_TDC_MASK;
memset(&priv->fd.tdc, 0, sizeof(priv->fd.tdc));
}
if (!(priv->ctrlmode & CAN_CTRLMODE_XL)) {
memset(&priv->xl.data_bittiming, 0,
sizeof(priv->fd.data_bittiming));
priv->ctrlmode &= ~CAN_CTRLMODE_XL_TDC_MASK;
memset(&priv->xl.tdc, 0, sizeof(priv->xl.tdc));
memset(&priv->xl.pwm, 0, sizeof(priv->xl.pwm));
}
can_set_default_mtu(dev);
can_set_cap_info(dev);
return 0;
}
static int can_tdc_changelink(struct data_bittiming_params *dbt_params,
const struct nlattr *nla,
struct netlink_ext_ack *extack)
{
struct nlattr *tb_tdc[IFLA_CAN_TDC_MAX + 1];
struct can_tdc tdc = { 0 };
const struct can_tdc_const *tdc_const = dbt_params->tdc_const;
int err;
if (!tdc_const) {
NL_SET_ERR_MSG(extack, "The device does not support TDC");
return -EOPNOTSUPP;
}
err = nla_parse_nested(tb_tdc, IFLA_CAN_TDC_MAX, nla,
can_tdc_policy, extack);
if (err)
return err;
if (tb_tdc[IFLA_CAN_TDC_TDCV]) {
u32 tdcv = nla_get_u32(tb_tdc[IFLA_CAN_TDC_TDCV]);
if (tdcv < tdc_const->tdcv_min || tdcv > tdc_const->tdcv_max)
return -EINVAL;
tdc.tdcv = tdcv;
}
if (tb_tdc[IFLA_CAN_TDC_TDCO]) {
u32 tdco = nla_get_u32(tb_tdc[IFLA_CAN_TDC_TDCO]);
if (tdco < tdc_const->tdco_min || tdco > tdc_const->tdco_max)
return -EINVAL;
tdc.tdco = tdco;
}
if (tb_tdc[IFLA_CAN_TDC_TDCF]) {
u32 tdcf = nla_get_u32(tb_tdc[IFLA_CAN_TDC_TDCF]);
if (tdcf < tdc_const->tdcf_min || tdcf > tdc_const->tdcf_max)
return -EINVAL;
tdc.tdcf = tdcf;
}
dbt_params->tdc = tdc;
return 0;
}
static int can_dbt_changelink(struct net_device *dev, struct nlattr *data[],
bool fd, struct netlink_ext_ack *extack)
{
struct nlattr *data_bittiming, *data_tdc;
struct can_priv *priv = netdev_priv(dev);
struct data_bittiming_params *dbt_params;
struct can_bittiming dbt;
bool need_tdc_calc = false;
u32 tdc_mask;
int err;
if (fd) {
data_bittiming = data[IFLA_CAN_DATA_BITTIMING];
data_tdc = data[IFLA_CAN_TDC];
dbt_params = &priv->fd;
tdc_mask = CAN_CTRLMODE_FD_TDC_MASK;
} else {
data_bittiming = data[IFLA_CAN_XL_DATA_BITTIMING];
data_tdc = data[IFLA_CAN_XL_TDC];
dbt_params = &priv->xl;
tdc_mask = CAN_CTRLMODE_XL_TDC_MASK;
}
if (!data_bittiming)
return 0;
/* Do not allow changing bittiming while running */
if (dev->flags & IFF_UP)
return -EBUSY;
/* Calculate bittiming parameters based on data_bittiming_const
* if set, otherwise pass bitrate directly via do_set_bitrate().
* Bail out if neither is given.
*/
if (!dbt_params->data_bittiming_const && !dbt_params->do_set_data_bittiming &&
!dbt_params->data_bitrate_const)
return -EOPNOTSUPP;
memcpy(&dbt, nla_data(data_bittiming), sizeof(dbt));
err = can_get_bittiming(dev, &dbt, dbt_params->data_bittiming_const,
dbt_params->data_bitrate_const,
dbt_params->data_bitrate_const_cnt, extack);
if (err)
return err;
if (priv->bitrate_max && dbt.bitrate > priv->bitrate_max) {
NL_SET_ERR_MSG_FMT(extack,
"CAN data bitrate %u bps surpasses transceiver capabilities of %u bps",
dbt.bitrate, priv->bitrate_max);
return -EINVAL;
}
memset(&dbt_params->tdc, 0, sizeof(dbt_params->tdc));
if (data[IFLA_CAN_CTRLMODE]) {
struct can_ctrlmode *cm = nla_data(data[IFLA_CAN_CTRLMODE]);
if (fd || !(priv->ctrlmode & CAN_CTRLMODE_XL_TMS))
need_tdc_calc = !(cm->mask & tdc_mask);
}
if (data_tdc) {
/* TDC parameters are provided: use them */
err = can_tdc_changelink(dbt_params, data_tdc, extack);
if (err) {
priv->ctrlmode &= ~tdc_mask;
return err;
}
} else if (need_tdc_calc) {
/* Neither of TDC parameters nor TDC flags are provided:
* do calculation
*/
can_calc_tdco(&dbt_params->tdc, dbt_params->tdc_const, &dbt,
tdc_mask, &priv->ctrlmode, priv->ctrlmode_supported);
} /* else: both CAN_CTRLMODE_{,XL}_TDC_{AUTO,MANUAL} are explicitly
* turned off. TDC is disabled: do nothing
*/
memcpy(&dbt_params->data_bittiming, &dbt, sizeof(dbt));
if (dbt_params->do_set_data_bittiming) {
/* Finally, set the bit-timing registers */
err = dbt_params->do_set_data_bittiming(dev);
if (err)
return err;
}
return 0;
}
static int can_pwm_changelink(struct net_device *dev,
const struct nlattr *pwm_nla,
struct netlink_ext_ack *extack)
{
struct can_priv *priv = netdev_priv(dev);
const struct can_pwm_const *pwm_const = priv->xl.pwm_const;
struct nlattr *tb_pwm[IFLA_CAN_PWM_MAX + 1];
struct can_pwm pwm = { 0 };
int err;
if (!(priv->ctrlmode & CAN_CTRLMODE_XL_TMS))
return 0;
if (!pwm_const) {
NL_SET_ERR_MSG(extack, "The device does not support PWM");
return -EOPNOTSUPP;
}
if (!pwm_nla)
return can_calc_pwm(dev, extack);
err = nla_parse_nested(tb_pwm, IFLA_CAN_PWM_MAX, pwm_nla,
can_pwm_policy, extack);
if (err)
return err;
if (tb_pwm[IFLA_CAN_PWM_PWMS]) {
pwm.pwms = nla_get_u32(tb_pwm[IFLA_CAN_PWM_PWMS]);
if (pwm.pwms < pwm_const->pwms_min ||
pwm.pwms > pwm_const->pwms_max) {
NL_SET_ERR_MSG_FMT(extack,
"PWMS: %u tqmin is out of range: %u...%u",
pwm.pwms, pwm_const->pwms_min,
pwm_const->pwms_max);
return -EINVAL;
}
}
if (tb_pwm[IFLA_CAN_PWM_PWML]) {
pwm.pwml = nla_get_u32(tb_pwm[IFLA_CAN_PWM_PWML]);
if (pwm.pwml < pwm_const->pwml_min ||
pwm.pwml > pwm_const->pwml_max) {
NL_SET_ERR_MSG_FMT(extack,
"PWML: %u tqmin is out of range: %u...%u",
pwm.pwml, pwm_const->pwml_min,
pwm_const->pwml_max);
return -EINVAL;
}
}
if (tb_pwm[IFLA_CAN_PWM_PWMO]) {
pwm.pwmo = nla_get_u32(tb_pwm[IFLA_CAN_PWM_PWMO]);
if (pwm.pwmo < pwm_const->pwmo_min ||
pwm.pwmo > pwm_const->pwmo_max) {
NL_SET_ERR_MSG_FMT(extack,
"PWMO: %u tqmin is out of range: %u...%u",
pwm.pwmo, pwm_const->pwmo_min,
pwm_const->pwmo_max);
return -EINVAL;
}
}
err = can_validate_pwm_bittiming(dev, &pwm, extack);
if (err)
return err;
priv->xl.pwm = pwm;
return 0;
}
static int can_changelink(struct net_device *dev, struct nlattr *tb[],
struct nlattr *data[],
struct netlink_ext_ack *extack)
{
struct can_priv *priv = netdev_priv(dev);
int err;
/* We need synchronization with dev->stop() */
ASSERT_RTNL();
err = can_ctrlmode_changelink(dev, data, extack);
if (err)
return err;
if (data[IFLA_CAN_BITTIMING]) {
struct can_bittiming bt;
/* Do not allow changing bittiming while running */
if (dev->flags & IFF_UP)
return -EBUSY;
/* Calculate bittiming parameters based on
* bittiming_const if set, otherwise pass bitrate
* directly via do_set_bitrate(). Bail out if neither
* is given.
*/
if (!priv->bittiming_const && !priv->do_set_bittiming &&
!priv->bitrate_const)
return -EOPNOTSUPP;
memcpy(&bt, nla_data(data[IFLA_CAN_BITTIMING]), sizeof(bt));
err = can_get_bittiming(dev, &bt,
priv->bittiming_const,
priv->bitrate_const,
priv->bitrate_const_cnt,
extack);
if (err)
return err;
if (priv->bitrate_max && bt.bitrate > priv->bitrate_max) {
NL_SET_ERR_MSG_FMT(extack,
"arbitration bitrate %u bps surpasses transceiver capabilities of %u bps",
bt.bitrate, priv->bitrate_max);
return -EINVAL;
}
memcpy(&priv->bittiming, &bt, sizeof(bt));
if (priv->do_set_bittiming) {
/* Finally, set the bit-timing registers */
err = priv->do_set_bittiming(dev);
if (err)
return err;
}
}
if (data[IFLA_CAN_RESTART_MS]) {
unsigned int restart_ms = nla_get_u32(data[IFLA_CAN_RESTART_MS]);
if (restart_ms != 0 && !priv->do_set_mode) {
NL_SET_ERR_MSG(extack,
"Device doesn't support restart from Bus Off");
return -EOPNOTSUPP;
}
/* Do not allow changing restart delay while running */
if (dev->flags & IFF_UP)
return -EBUSY;
priv->restart_ms = restart_ms;
}
if (data[IFLA_CAN_RESTART]) {
if (!priv->do_set_mode) {
NL_SET_ERR_MSG(extack,
"Device doesn't support restart from Bus Off");
return -EOPNOTSUPP;
}
/* Do not allow a restart while not running */
if (!(dev->flags & IFF_UP))
return -EINVAL;
err = can_restart_now(dev);
if (err)
return err;
}
/* CAN FD */
err = can_dbt_changelink(dev, data, true, extack);
if (err)
return err;
/* CAN XL */
err = can_dbt_changelink(dev, data, false, extack);
if (err)
return err;
err = can_pwm_changelink(dev, data[IFLA_CAN_XL_PWM], extack);
if (err)
return err;
if (data[IFLA_CAN_TERMINATION]) {
const u16 termval = nla_get_u16(data[IFLA_CAN_TERMINATION]);
const unsigned int num_term = priv->termination_const_cnt;
unsigned int i;
if (!priv->do_set_termination) {
NL_SET_ERR_MSG(extack,
"Termination is not configurable on this device");
return -EOPNOTSUPP;
}
/* check whether given value is supported by the interface */
for (i = 0; i < num_term; i++) {
if (termval == priv->termination_const[i])
break;
}
if (i >= num_term)
return -EINVAL;
/* Finally, set the termination value */
err = priv->do_set_termination(dev, termval);
if (err)
return err;
priv->termination = termval;
}
return 0;
}
static size_t can_tdc_get_size(struct data_bittiming_params *dbt_params,
u32 tdc_flags)
{
bool tdc_manual = tdc_flags & CAN_CTRLMODE_TDC_MANUAL_MASK;
size_t size;
if (!dbt_params->tdc_const)
return 0;
size = nla_total_size(0); /* nest IFLA_CAN_TDC */
if (tdc_manual) {
size += nla_total_size(sizeof(u32)); /* IFLA_CAN_TDCV_MIN */
size += nla_total_size(sizeof(u32)); /* IFLA_CAN_TDCV_MAX */
}
size += nla_total_size(sizeof(u32)); /* IFLA_CAN_TDCO_MIN */
size += nla_total_size(sizeof(u32)); /* IFLA_CAN_TDCO_MAX */
if (dbt_params->tdc_const->tdcf_max) {
size += nla_total_size(sizeof(u32)); /* IFLA_CAN_TDCF_MIN */
size += nla_total_size(sizeof(u32)); /* IFLA_CAN_TDCF_MAX */
}
if (tdc_flags) {
if (tdc_manual || dbt_params->do_get_auto_tdcv)
size += nla_total_size(sizeof(u32)); /* IFLA_CAN_TDCV */
size += nla_total_size(sizeof(u32)); /* IFLA_CAN_TDCO */
if (dbt_params->tdc_const->tdcf_max)
size += nla_total_size(sizeof(u32)); /* IFLA_CAN_TDCF */
}
return size;
}
static size_t can_data_bittiming_get_size(struct data_bittiming_params *dbt_params,
u32 tdc_flags)
{
size_t size = 0;
if (dbt_params->data_bittiming.bitrate) /* IFLA_CAN_{,XL}_DATA_BITTIMING */
size += nla_total_size(sizeof(dbt_params->data_bittiming));
if (dbt_params->data_bittiming_const) /* IFLA_CAN_{,XL}_DATA_BITTIMING_CONST */
size += nla_total_size(sizeof(*dbt_params->data_bittiming_const));
if (dbt_params->data_bitrate_const) /* IFLA_CAN_{,XL}_DATA_BITRATE_CONST */
size += nla_total_size(sizeof(*dbt_params->data_bitrate_const) *
dbt_params->data_bitrate_const_cnt);
size += can_tdc_get_size(dbt_params, tdc_flags);/* IFLA_CAN_{,XL}_TDC */
return size;
}
static size_t can_ctrlmode_ext_get_size(void)
{
return nla_total_size(0) + /* nest IFLA_CAN_CTRLMODE_EXT */
nla_total_size(sizeof(u32)); /* IFLA_CAN_CTRLMODE_SUPPORTED */
}
static size_t can_pwm_get_size(const struct can_pwm_const *pwm_const,
bool pwm_on)
{
size_t size;
if (!pwm_const || !pwm_on)
return 0;
size = nla_total_size(0); /* nest IFLA_CAN_PWM */
size += nla_total_size(sizeof(u32)); /* IFLA_CAN_PWM_PWMS_MIN */
size += nla_total_size(sizeof(u32)); /* IFLA_CAN_PWM_PWMS_MAX */
size += nla_total_size(sizeof(u32)); /* IFLA_CAN_PWM_PWML_MIN */
size += nla_total_size(sizeof(u32)); /* IFLA_CAN_PWM_PWML_MAX */
size += nla_total_size(sizeof(u32)); /* IFLA_CAN_PWM_PWMO_MIN */
size += nla_total_size(sizeof(u32)); /* IFLA_CAN_PWM_PWMO_MAX */
size += nla_total_size(sizeof(u32)); /* IFLA_CAN_PWM_PWMS */
size += nla_total_size(sizeof(u32)); /* IFLA_CAN_PWM_PWML */
size += nla_total_size(sizeof(u32)); /* IFLA_CAN_PWM_PWMO */
return size;
}
static size_t can_get_size(const struct net_device *dev)
{
struct can_priv *priv = netdev_priv(dev);
size_t size = 0;
if (priv->bittiming.bitrate) /* IFLA_CAN_BITTIMING */
size += nla_total_size(sizeof(struct can_bittiming));
if (priv->bittiming_const) /* IFLA_CAN_BITTIMING_CONST */
size += nla_total_size(sizeof(struct can_bittiming_const));
size += nla_total_size(sizeof(struct can_clock)); /* IFLA_CAN_CLOCK */
size += nla_total_size(sizeof(u32)); /* IFLA_CAN_STATE */
size += nla_total_size(sizeof(struct can_ctrlmode)); /* IFLA_CAN_CTRLMODE */
size += nla_total_size(sizeof(u32)); /* IFLA_CAN_RESTART_MS */
if (priv->do_get_berr_counter) /* IFLA_CAN_BERR_COUNTER */
size += nla_total_size(sizeof(struct can_berr_counter));
if (priv->termination_const) {
size += nla_total_size(sizeof(priv->termination)); /* IFLA_CAN_TERMINATION */
size += nla_total_size(sizeof(*priv->termination_const) * /* IFLA_CAN_TERMINATION_CONST */
priv->termination_const_cnt);
}
if (priv->bitrate_const) /* IFLA_CAN_BITRATE_CONST */
size += nla_total_size(sizeof(*priv->bitrate_const) *
priv->bitrate_const_cnt);
size += sizeof(priv->bitrate_max); /* IFLA_CAN_BITRATE_MAX */
size += can_ctrlmode_ext_get_size(); /* IFLA_CAN_CTRLMODE_EXT */
size += can_data_bittiming_get_size(&priv->fd,
priv->ctrlmode & CAN_CTRLMODE_FD_TDC_MASK);
size += can_data_bittiming_get_size(&priv->xl,
priv->ctrlmode & CAN_CTRLMODE_XL_TDC_MASK);
size += can_pwm_get_size(priv->xl.pwm_const, /* IFLA_CAN_XL_PWM */
priv->ctrlmode & CAN_CTRLMODE_XL_TMS);
return size;
}
static int can_bittiming_fill_info(struct sk_buff *skb, int ifla_can_bittiming,
struct can_bittiming *bittiming)
{
return bittiming->bitrate != CAN_BITRATE_UNSET &&
bittiming->bitrate != CAN_BITRATE_UNKNOWN &&
nla_put(skb, ifla_can_bittiming, sizeof(*bittiming), bittiming);
}
static int can_bittiming_const_fill_info(struct sk_buff *skb,
int ifla_can_bittiming_const,
const struct can_bittiming_const *bittiming_const)
{
return bittiming_const &&
nla_put(skb, ifla_can_bittiming_const,
sizeof(*bittiming_const), bittiming_const);
}
static int can_bitrate_const_fill_info(struct sk_buff *skb,
int ifla_can_bitrate_const,
const u32 *bitrate_const, unsigned int cnt)
{
return bitrate_const &&
nla_put(skb, ifla_can_bitrate_const,
sizeof(*bitrate_const) * cnt, bitrate_const);
}
static int can_tdc_fill_info(struct sk_buff *skb, const struct net_device *dev,
int ifla_can_tdc)
{
struct can_priv *priv = netdev_priv(dev);
struct data_bittiming_params *dbt_params;
const struct can_tdc_const *tdc_const;
struct can_tdc *tdc;
struct nlattr *nest;
bool tdc_is_enabled, tdc_manual;
if (ifla_can_tdc == IFLA_CAN_TDC) {
dbt_params = &priv->fd;
tdc_is_enabled = can_fd_tdc_is_enabled(priv);
tdc_manual = priv->ctrlmode & CAN_CTRLMODE_TDC_MANUAL;
} else {
dbt_params = &priv->xl;
tdc_is_enabled = can_xl_tdc_is_enabled(priv);
tdc_manual = priv->ctrlmode & CAN_CTRLMODE_XL_TDC_MANUAL;
}
tdc_const = dbt_params->tdc_const;
tdc = &dbt_params->tdc;
if (!tdc_const)
return 0;
nest = nla_nest_start(skb, ifla_can_tdc);
if (!nest)
return -EMSGSIZE;
if (tdc_manual &&
(nla_put_u32(skb, IFLA_CAN_TDC_TDCV_MIN, tdc_const->tdcv_min) ||
nla_put_u32(skb, IFLA_CAN_TDC_TDCV_MAX, tdc_const->tdcv_max)))
goto err_cancel;
if (nla_put_u32(skb, IFLA_CAN_TDC_TDCO_MIN, tdc_const->tdco_min) ||
nla_put_u32(skb, IFLA_CAN_TDC_TDCO_MAX, tdc_const->tdco_max))
goto err_cancel;
if (tdc_const->tdcf_max &&
(nla_put_u32(skb, IFLA_CAN_TDC_TDCF_MIN, tdc_const->tdcf_min) ||
nla_put_u32(skb, IFLA_CAN_TDC_TDCF_MAX, tdc_const->tdcf_max)))
goto err_cancel;
if (tdc_is_enabled) {
u32 tdcv;
int err = -EINVAL;
if (tdc_manual) {
tdcv = tdc->tdcv;
err = 0;
} else if (dbt_params->do_get_auto_tdcv) {
err = dbt_params->do_get_auto_tdcv(dev, &tdcv);
}
if (!err && nla_put_u32(skb, IFLA_CAN_TDC_TDCV, tdcv))
goto err_cancel;
if (nla_put_u32(skb, IFLA_CAN_TDC_TDCO, tdc->tdco))
goto err_cancel;
if (tdc_const->tdcf_max &&
nla_put_u32(skb, IFLA_CAN_TDC_TDCF, tdc->tdcf))
goto err_cancel;
}
nla_nest_end(skb, nest);
return 0;
err_cancel:
nla_nest_cancel(skb, nest);
return -EMSGSIZE;
}
static int can_pwm_fill_info(struct sk_buff *skb, const struct can_priv *priv)
{
const struct can_pwm_const *pwm_const = priv->xl.pwm_const;
const struct can_pwm *pwm = &priv->xl.pwm;
struct nlattr *nest;
if (!pwm_const)
return 0;
nest = nla_nest_start(skb, IFLA_CAN_XL_PWM);
if (!nest)
return -EMSGSIZE;
if (nla_put_u32(skb, IFLA_CAN_PWM_PWMS_MIN, pwm_const->pwms_min) ||
nla_put_u32(skb, IFLA_CAN_PWM_PWMS_MAX, pwm_const->pwms_max) ||
nla_put_u32(skb, IFLA_CAN_PWM_PWML_MIN, pwm_const->pwml_min) ||
nla_put_u32(skb, IFLA_CAN_PWM_PWML_MAX, pwm_const->pwml_max) ||
nla_put_u32(skb, IFLA_CAN_PWM_PWMO_MIN, pwm_const->pwmo_min) ||
nla_put_u32(skb, IFLA_CAN_PWM_PWMO_MAX, pwm_const->pwmo_max))
goto err_cancel;
if (priv->ctrlmode & CAN_CTRLMODE_XL_TMS) {
if (nla_put_u32(skb, IFLA_CAN_PWM_PWMS, pwm->pwms) ||
nla_put_u32(skb, IFLA_CAN_PWM_PWML, pwm->pwml) ||
nla_put_u32(skb, IFLA_CAN_PWM_PWMO, pwm->pwmo))
goto err_cancel;
}
nla_nest_end(skb, nest);
return 0;
err_cancel:
nla_nest_cancel(skb, nest);
return -EMSGSIZE;
}
static int can_ctrlmode_ext_fill_info(struct sk_buff *skb,
const struct can_priv *priv)
{
struct nlattr *nest;
nest = nla_nest_start(skb, IFLA_CAN_CTRLMODE_EXT);
if (!nest)
return -EMSGSIZE;
if (nla_put_u32(skb, IFLA_CAN_CTRLMODE_SUPPORTED,
priv->ctrlmode_supported)) {
nla_nest_cancel(skb, nest);
return -EMSGSIZE;
}
nla_nest_end(skb, nest);
return 0;
}
static int can_fill_info(struct sk_buff *skb, const struct net_device *dev)
{
struct can_priv *priv = netdev_priv(dev);
struct can_ctrlmode cm = {.flags = priv->ctrlmode};
struct can_berr_counter bec = { };
enum can_state state = priv->state;
if (priv->do_get_state)
priv->do_get_state(dev, &state);
if (can_bittiming_fill_info(skb, IFLA_CAN_BITTIMING,
&priv->bittiming) ||
can_bittiming_const_fill_info(skb, IFLA_CAN_BITTIMING_CONST,
priv->bittiming_const) ||
nla_put(skb, IFLA_CAN_CLOCK, sizeof(priv->clock), &priv->clock) ||
nla_put_u32(skb, IFLA_CAN_STATE, state) ||
nla_put(skb, IFLA_CAN_CTRLMODE, sizeof(cm), &cm) ||
nla_put_u32(skb, IFLA_CAN_RESTART_MS, priv->restart_ms) ||
(priv->do_get_berr_counter &&
!priv->do_get_berr_counter(dev, &bec) &&
nla_put(skb, IFLA_CAN_BERR_COUNTER, sizeof(bec), &bec)) ||
can_bittiming_fill_info(skb, IFLA_CAN_DATA_BITTIMING,
&priv->fd.data_bittiming) ||
can_bittiming_const_fill_info(skb, IFLA_CAN_DATA_BITTIMING_CONST,
priv->fd.data_bittiming_const) ||
(priv->termination_const &&
(nla_put_u16(skb, IFLA_CAN_TERMINATION, priv->termination) ||
nla_put(skb, IFLA_CAN_TERMINATION_CONST,
sizeof(*priv->termination_const) *
priv->termination_const_cnt,
priv->termination_const))) ||
can_bitrate_const_fill_info(skb, IFLA_CAN_BITRATE_CONST,
priv->bitrate_const,
priv->bitrate_const_cnt) ||
can_bitrate_const_fill_info(skb, IFLA_CAN_DATA_BITRATE_CONST,
priv->fd.data_bitrate_const,
priv->fd.data_bitrate_const_cnt) ||
(nla_put(skb, IFLA_CAN_BITRATE_MAX,
sizeof(priv->bitrate_max),
&priv->bitrate_max)) ||
can_tdc_fill_info(skb, dev, IFLA_CAN_TDC) ||
can_ctrlmode_ext_fill_info(skb, priv) ||
can_bittiming_fill_info(skb, IFLA_CAN_XL_DATA_BITTIMING,
&priv->xl.data_bittiming) ||
can_bittiming_const_fill_info(skb, IFLA_CAN_XL_DATA_BITTIMING_CONST,
priv->xl.data_bittiming_const) ||
can_bitrate_const_fill_info(skb, IFLA_CAN_XL_DATA_BITRATE_CONST,
priv->xl.data_bitrate_const,
priv->xl.data_bitrate_const_cnt) ||
can_tdc_fill_info(skb, dev, IFLA_CAN_XL_TDC) ||
can_pwm_fill_info(skb, priv)
)
return -EMSGSIZE;
return 0;
}
static size_t can_get_xstats_size(const struct net_device *dev)
{
return sizeof(struct can_device_stats);
}
static int can_fill_xstats(struct sk_buff *skb, const struct net_device *dev)
{
struct can_priv *priv = netdev_priv(dev);
if (nla_put(skb, IFLA_INFO_XSTATS,
sizeof(priv->can_stats), &priv->can_stats))
goto nla_put_failure;
return 0;
nla_put_failure:
return -EMSGSIZE;
}
static int can_newlink(struct net_device *dev,
struct rtnl_newlink_params *params,
struct netlink_ext_ack *extack)
{
return -EOPNOTSUPP;
}
static void can_dellink(struct net_device *dev, struct list_head *head)
{
}
struct rtnl_link_ops can_link_ops __read_mostly = {
.kind = "can",
.netns_refund = true,
.maxtype = IFLA_CAN_MAX,
.policy = can_policy,
.setup = can_setup,
.validate = can_validate,
.newlink = can_newlink,
.changelink = can_changelink,
.dellink = can_dellink,
.get_size = can_get_size,
.fill_info = can_fill_info,
.get_xstats_size = can_get_xstats_size,
.fill_xstats = can_fill_xstats,
};
int can_netlink_register(void)
{
return rtnl_link_register(&can_link_ops);
}
void can_netlink_unregister(void)
{
rtnl_link_unregister(&can_link_ops);
}
