383 строки
11 KiB
C
383 строки
11 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/* Copyright (C) 2005 Marc Kleine-Budde, Pengutronix
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* Copyright (C) 2006 Andrey Volkov, Varma Electronics
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* Copyright (C) 2008-2009 Wolfgang Grandegger <wg@grandegger.com>
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*/
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#include <linux/can/dev.h>
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#include <net/rtnetlink.h>
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static const struct nla_policy can_policy[IFLA_CAN_MAX + 1] = {
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[IFLA_CAN_STATE] = { .type = NLA_U32 },
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[IFLA_CAN_CTRLMODE] = { .len = sizeof(struct can_ctrlmode) },
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[IFLA_CAN_RESTART_MS] = { .type = NLA_U32 },
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[IFLA_CAN_RESTART] = { .type = NLA_U32 },
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[IFLA_CAN_BITTIMING] = { .len = sizeof(struct can_bittiming) },
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[IFLA_CAN_BITTIMING_CONST] = { .len = sizeof(struct can_bittiming_const) },
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[IFLA_CAN_CLOCK] = { .len = sizeof(struct can_clock) },
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[IFLA_CAN_BERR_COUNTER] = { .len = sizeof(struct can_berr_counter) },
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[IFLA_CAN_DATA_BITTIMING] = { .len = sizeof(struct can_bittiming) },
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[IFLA_CAN_DATA_BITTIMING_CONST] = { .len = sizeof(struct can_bittiming_const) },
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[IFLA_CAN_TERMINATION] = { .type = NLA_U16 },
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};
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static int can_validate(struct nlattr *tb[], struct nlattr *data[],
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struct netlink_ext_ack *extack)
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{
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bool is_can_fd = false;
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/* Make sure that valid CAN FD configurations always consist of
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* - nominal/arbitration bittiming
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* - data bittiming
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* - control mode with CAN_CTRLMODE_FD set
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*/
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if (!data)
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return 0;
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if (data[IFLA_CAN_CTRLMODE]) {
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struct can_ctrlmode *cm = nla_data(data[IFLA_CAN_CTRLMODE]);
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is_can_fd = cm->flags & cm->mask & CAN_CTRLMODE_FD;
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}
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if (is_can_fd) {
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if (!data[IFLA_CAN_BITTIMING] || !data[IFLA_CAN_DATA_BITTIMING])
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return -EOPNOTSUPP;
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}
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if (data[IFLA_CAN_DATA_BITTIMING]) {
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if (!is_can_fd)
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return -EOPNOTSUPP;
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}
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return 0;
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}
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static int can_changelink(struct net_device *dev, struct nlattr *tb[],
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struct nlattr *data[],
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struct netlink_ext_ack *extack)
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{
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struct can_priv *priv = netdev_priv(dev);
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int err;
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/* We need synchronization with dev->stop() */
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ASSERT_RTNL();
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if (data[IFLA_CAN_BITTIMING]) {
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struct can_bittiming bt;
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/* Do not allow changing bittiming while running */
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if (dev->flags & IFF_UP)
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return -EBUSY;
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/* Calculate bittiming parameters based on
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* bittiming_const if set, otherwise pass bitrate
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* directly via do_set_bitrate(). Bail out if neither
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* is given.
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*/
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if (!priv->bittiming_const && !priv->do_set_bittiming)
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return -EOPNOTSUPP;
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memcpy(&bt, nla_data(data[IFLA_CAN_BITTIMING]), sizeof(bt));
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err = can_get_bittiming(dev, &bt,
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priv->bittiming_const,
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priv->bitrate_const,
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priv->bitrate_const_cnt);
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if (err)
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return err;
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if (priv->bitrate_max && bt.bitrate > priv->bitrate_max) {
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netdev_err(dev, "arbitration bitrate surpasses transceiver capabilities of %d bps\n",
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priv->bitrate_max);
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return -EINVAL;
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}
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memcpy(&priv->bittiming, &bt, sizeof(bt));
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if (priv->do_set_bittiming) {
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/* Finally, set the bit-timing registers */
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err = priv->do_set_bittiming(dev);
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if (err)
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return err;
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}
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}
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if (data[IFLA_CAN_CTRLMODE]) {
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struct can_ctrlmode *cm;
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u32 ctrlstatic;
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u32 maskedflags;
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/* Do not allow changing controller mode while running */
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if (dev->flags & IFF_UP)
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return -EBUSY;
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cm = nla_data(data[IFLA_CAN_CTRLMODE]);
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ctrlstatic = priv->ctrlmode_static;
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maskedflags = cm->flags & cm->mask;
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/* check whether provided bits are allowed to be passed */
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if (maskedflags & ~(priv->ctrlmode_supported | ctrlstatic))
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return -EOPNOTSUPP;
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/* do not check for static fd-non-iso if 'fd' is disabled */
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if (!(maskedflags & CAN_CTRLMODE_FD))
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ctrlstatic &= ~CAN_CTRLMODE_FD_NON_ISO;
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/* make sure static options are provided by configuration */
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if ((maskedflags & ctrlstatic) != ctrlstatic)
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return -EOPNOTSUPP;
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/* clear bits to be modified and copy the flag values */
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priv->ctrlmode &= ~cm->mask;
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priv->ctrlmode |= maskedflags;
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/* CAN_CTRLMODE_FD can only be set when driver supports FD */
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if (priv->ctrlmode & CAN_CTRLMODE_FD) {
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dev->mtu = CANFD_MTU;
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} else {
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dev->mtu = CAN_MTU;
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memset(&priv->data_bittiming, 0,
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sizeof(priv->data_bittiming));
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}
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}
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if (data[IFLA_CAN_RESTART_MS]) {
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/* Do not allow changing restart delay while running */
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if (dev->flags & IFF_UP)
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return -EBUSY;
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priv->restart_ms = nla_get_u32(data[IFLA_CAN_RESTART_MS]);
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}
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if (data[IFLA_CAN_RESTART]) {
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/* Do not allow a restart while not running */
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if (!(dev->flags & IFF_UP))
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return -EINVAL;
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err = can_restart_now(dev);
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if (err)
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return err;
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}
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if (data[IFLA_CAN_DATA_BITTIMING]) {
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struct can_bittiming dbt;
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/* Do not allow changing bittiming while running */
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if (dev->flags & IFF_UP)
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return -EBUSY;
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/* Calculate bittiming parameters based on
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* data_bittiming_const if set, otherwise pass bitrate
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* directly via do_set_bitrate(). Bail out if neither
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* is given.
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*/
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if (!priv->data_bittiming_const && !priv->do_set_data_bittiming)
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return -EOPNOTSUPP;
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memcpy(&dbt, nla_data(data[IFLA_CAN_DATA_BITTIMING]),
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sizeof(dbt));
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err = can_get_bittiming(dev, &dbt,
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priv->data_bittiming_const,
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priv->data_bitrate_const,
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priv->data_bitrate_const_cnt);
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if (err)
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return err;
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if (priv->bitrate_max && dbt.bitrate > priv->bitrate_max) {
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netdev_err(dev, "canfd data bitrate surpasses transceiver capabilities of %d bps\n",
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priv->bitrate_max);
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return -EINVAL;
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}
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memcpy(&priv->data_bittiming, &dbt, sizeof(dbt));
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can_calc_tdco(dev);
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if (priv->do_set_data_bittiming) {
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/* Finally, set the bit-timing registers */
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err = priv->do_set_data_bittiming(dev);
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if (err)
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return err;
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}
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}
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if (data[IFLA_CAN_TERMINATION]) {
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const u16 termval = nla_get_u16(data[IFLA_CAN_TERMINATION]);
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const unsigned int num_term = priv->termination_const_cnt;
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unsigned int i;
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if (!priv->do_set_termination)
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return -EOPNOTSUPP;
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/* check whether given value is supported by the interface */
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for (i = 0; i < num_term; i++) {
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if (termval == priv->termination_const[i])
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break;
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}
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if (i >= num_term)
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return -EINVAL;
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/* Finally, set the termination value */
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err = priv->do_set_termination(dev, termval);
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if (err)
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return err;
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priv->termination = termval;
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}
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return 0;
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}
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static size_t can_get_size(const struct net_device *dev)
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{
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struct can_priv *priv = netdev_priv(dev);
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size_t size = 0;
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if (priv->bittiming.bitrate) /* IFLA_CAN_BITTIMING */
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size += nla_total_size(sizeof(struct can_bittiming));
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if (priv->bittiming_const) /* IFLA_CAN_BITTIMING_CONST */
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size += nla_total_size(sizeof(struct can_bittiming_const));
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size += nla_total_size(sizeof(struct can_clock)); /* IFLA_CAN_CLOCK */
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size += nla_total_size(sizeof(u32)); /* IFLA_CAN_STATE */
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size += nla_total_size(sizeof(struct can_ctrlmode)); /* IFLA_CAN_CTRLMODE */
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size += nla_total_size(sizeof(u32)); /* IFLA_CAN_RESTART_MS */
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if (priv->do_get_berr_counter) /* IFLA_CAN_BERR_COUNTER */
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size += nla_total_size(sizeof(struct can_berr_counter));
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if (priv->data_bittiming.bitrate) /* IFLA_CAN_DATA_BITTIMING */
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size += nla_total_size(sizeof(struct can_bittiming));
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if (priv->data_bittiming_const) /* IFLA_CAN_DATA_BITTIMING_CONST */
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size += nla_total_size(sizeof(struct can_bittiming_const));
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if (priv->termination_const) {
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size += nla_total_size(sizeof(priv->termination)); /* IFLA_CAN_TERMINATION */
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size += nla_total_size(sizeof(*priv->termination_const) * /* IFLA_CAN_TERMINATION_CONST */
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priv->termination_const_cnt);
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}
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if (priv->bitrate_const) /* IFLA_CAN_BITRATE_CONST */
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size += nla_total_size(sizeof(*priv->bitrate_const) *
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priv->bitrate_const_cnt);
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if (priv->data_bitrate_const) /* IFLA_CAN_DATA_BITRATE_CONST */
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size += nla_total_size(sizeof(*priv->data_bitrate_const) *
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priv->data_bitrate_const_cnt);
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size += sizeof(priv->bitrate_max); /* IFLA_CAN_BITRATE_MAX */
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return size;
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}
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static int can_fill_info(struct sk_buff *skb, const struct net_device *dev)
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{
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struct can_priv *priv = netdev_priv(dev);
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struct can_ctrlmode cm = {.flags = priv->ctrlmode};
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struct can_berr_counter bec = { };
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enum can_state state = priv->state;
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if (priv->do_get_state)
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priv->do_get_state(dev, &state);
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if ((priv->bittiming.bitrate &&
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nla_put(skb, IFLA_CAN_BITTIMING,
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sizeof(priv->bittiming), &priv->bittiming)) ||
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(priv->bittiming_const &&
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nla_put(skb, IFLA_CAN_BITTIMING_CONST,
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sizeof(*priv->bittiming_const), priv->bittiming_const)) ||
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nla_put(skb, IFLA_CAN_CLOCK, sizeof(priv->clock), &priv->clock) ||
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nla_put_u32(skb, IFLA_CAN_STATE, state) ||
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nla_put(skb, IFLA_CAN_CTRLMODE, sizeof(cm), &cm) ||
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nla_put_u32(skb, IFLA_CAN_RESTART_MS, priv->restart_ms) ||
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(priv->do_get_berr_counter &&
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!priv->do_get_berr_counter(dev, &bec) &&
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nla_put(skb, IFLA_CAN_BERR_COUNTER, sizeof(bec), &bec)) ||
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(priv->data_bittiming.bitrate &&
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nla_put(skb, IFLA_CAN_DATA_BITTIMING,
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sizeof(priv->data_bittiming), &priv->data_bittiming)) ||
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(priv->data_bittiming_const &&
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nla_put(skb, IFLA_CAN_DATA_BITTIMING_CONST,
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sizeof(*priv->data_bittiming_const),
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priv->data_bittiming_const)) ||
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(priv->termination_const &&
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(nla_put_u16(skb, IFLA_CAN_TERMINATION, priv->termination) ||
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nla_put(skb, IFLA_CAN_TERMINATION_CONST,
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sizeof(*priv->termination_const) *
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priv->termination_const_cnt,
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priv->termination_const))) ||
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(priv->bitrate_const &&
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nla_put(skb, IFLA_CAN_BITRATE_CONST,
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sizeof(*priv->bitrate_const) *
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priv->bitrate_const_cnt,
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priv->bitrate_const)) ||
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(priv->data_bitrate_const &&
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nla_put(skb, IFLA_CAN_DATA_BITRATE_CONST,
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sizeof(*priv->data_bitrate_const) *
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priv->data_bitrate_const_cnt,
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priv->data_bitrate_const)) ||
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(nla_put(skb, IFLA_CAN_BITRATE_MAX,
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sizeof(priv->bitrate_max),
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&priv->bitrate_max))
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)
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return -EMSGSIZE;
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return 0;
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}
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static size_t can_get_xstats_size(const struct net_device *dev)
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{
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return sizeof(struct can_device_stats);
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}
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static int can_fill_xstats(struct sk_buff *skb, const struct net_device *dev)
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{
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struct can_priv *priv = netdev_priv(dev);
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if (nla_put(skb, IFLA_INFO_XSTATS,
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sizeof(priv->can_stats), &priv->can_stats))
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goto nla_put_failure;
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return 0;
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nla_put_failure:
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return -EMSGSIZE;
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}
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static int can_newlink(struct net *src_net, struct net_device *dev,
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struct nlattr *tb[], struct nlattr *data[],
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struct netlink_ext_ack *extack)
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{
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return -EOPNOTSUPP;
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}
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static void can_dellink(struct net_device *dev, struct list_head *head)
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{
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}
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struct rtnl_link_ops can_link_ops __read_mostly = {
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.kind = "can",
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.netns_refund = true,
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.maxtype = IFLA_CAN_MAX,
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.policy = can_policy,
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.setup = can_setup,
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.validate = can_validate,
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.newlink = can_newlink,
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.changelink = can_changelink,
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.dellink = can_dellink,
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.get_size = can_get_size,
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.fill_info = can_fill_info,
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.get_xstats_size = can_get_xstats_size,
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.fill_xstats = can_fill_xstats,
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};
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int can_netlink_register(void)
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{
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return rtnl_link_register(&can_link_ops);
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}
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void can_netlink_unregister(void)
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{
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rtnl_link_unregister(&can_link_ops);
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}
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