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/* SPDX-License-Identifier: LGPL-2.1+ */
#include <net/if.h>
#include <linux/can/netlink.h>
#include "netlink-util.h"
#include "networkd-can.h"
#include "networkd-link.h"
#include "networkd-manager.h"
#include "string-util.h"
static int link_up_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
int r;
assert(link);
if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
return 1;
r = sd_netlink_message_get_errno(m);
if (r < 0)
/* we warn but don't fail the link, as it may be brought up later */
log_link_warning_errno(link, r, "Could not bring up interface: %m");
return 1;
}
static int link_up_can(Link *link) {
_cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
int r;
assert(link);
log_link_debug(link, "Bringing CAN link up");
r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
if (r < 0)
return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
r = sd_rtnl_message_link_set_flags(req, IFF_UP, IFF_UP);
if (r < 0)
return log_link_error_errno(link, r, "Could not set link flags: %m");
r = netlink_call_async(link->manager->rtnl, NULL, req, link_up_handler,
link_netlink_destroy_callback, link);
if (r < 0)
return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
link_ref(link);
return 0;
}
static int link_set_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
int r;
assert(link);
log_link_debug(link, "Set link");
r = sd_netlink_message_get_errno(m);
if (r < 0 && r != -EEXIST) {
log_link_error_errno(link, r, "Failed to configure CAN link: %m");
link_enter_failed(link);
}
return 1;
}
static int link_set_can(Link *link) {
_cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL;
int r;
assert(link);
assert(link->network);
assert(link->manager);
assert(link->manager->rtnl);
log_link_debug(link, "Configuring CAN link.");
r = sd_rtnl_message_new_link(link->manager->rtnl, &m, RTM_NEWLINK, link->ifindex);
if (r < 0)
return log_link_error_errno(link, r, "Failed to allocate netlink message: %m");
r = sd_netlink_message_set_flags(m, NLM_F_REQUEST | NLM_F_ACK);
if (r < 0)
return log_link_error_errno(link, r, "Could not set netlink flags: %m");
r = sd_netlink_message_open_container(m, IFLA_LINKINFO);
if (r < 0)
return log_link_error_errno(link, r, "Failed to open netlink container: %m");
r = sd_netlink_message_open_container_union(m, IFLA_INFO_DATA, link->kind);
if (r < 0)
return log_link_error_errno(link, r, "Could not append IFLA_INFO_DATA attribute: %m");
if (link->network->can_bitrate > 0 || link->network->can_sample_point > 0) {
struct can_bittiming bt = {
.bitrate = link->network->can_bitrate,
.sample_point = link->network->can_sample_point,
};
if (link->network->can_bitrate > UINT32_MAX) {
log_link_error(link, "bitrate (%zu) too big.", link->network->can_bitrate);
return -ERANGE;
}
log_link_debug(link, "Setting bitrate = %d bit/s", bt.bitrate);
if (link->network->can_sample_point > 0)
log_link_debug(link, "Setting sample point = %d.%d%%", bt.sample_point / 10, bt.sample_point % 10);
else
log_link_debug(link, "Using default sample point");
r = sd_netlink_message_append_data(m, IFLA_CAN_BITTIMING, &bt, sizeof(bt));
if (r < 0)
return log_link_error_errno(link, r, "Could not append IFLA_CAN_BITTIMING attribute: %m");
}
if (link->network->can_restart_us > 0) {
char time_string[FORMAT_TIMESPAN_MAX];
uint64_t restart_ms;
if (link->network->can_restart_us == USEC_INFINITY)
restart_ms = 0;
else
restart_ms = DIV_ROUND_UP(link->network->can_restart_us, USEC_PER_MSEC);
format_timespan(time_string, FORMAT_TIMESPAN_MAX, restart_ms * 1000, MSEC_PER_SEC);
if (restart_ms > UINT32_MAX) {
log_link_error(link, "restart timeout (%s) too big.", time_string);
return -ERANGE;
}
log_link_debug(link, "Setting restart = %s", time_string);
r = sd_netlink_message_append_u32(m, IFLA_CAN_RESTART_MS, restart_ms);
if (r < 0)
return log_link_error_errno(link, r, "Could not append IFLA_CAN_RESTART_MS attribute: %m");
}
if (link->network->can_triple_sampling >= 0) {
struct can_ctrlmode cm = {
.mask = CAN_CTRLMODE_3_SAMPLES,
.flags = link->network->can_triple_sampling ? CAN_CTRLMODE_3_SAMPLES : 0,
};
log_link_debug(link, "%sabling triple-sampling", link->network->can_triple_sampling ? "En" : "Dis");
r = sd_netlink_message_append_data(m, IFLA_CAN_CTRLMODE, &cm, sizeof(cm));
if (r < 0)
return log_link_error_errno(link, r, "Could not append IFLA_CAN_CTRLMODE attribute: %m");
}
r = sd_netlink_message_close_container(m);
if (r < 0)
return log_link_error_errno(link, r, "Failed to close netlink container: %m");
r = sd_netlink_message_close_container(m);
if (r < 0)
return log_link_error_errno(link, r, "Failed to close netlink container: %m");
r = netlink_call_async(link->manager->rtnl, NULL, m, link_set_handler,
link_netlink_destroy_callback, link);
if (r < 0)
return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
link_ref(link);
if (!(link->flags & IFF_UP))
return link_up_can(link);
return 0;
}
static int link_down_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
int r;
assert(link);
if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
return 1;
r = sd_netlink_message_get_errno(m);
if (r < 0) {
log_link_warning_errno(link, r, "Could not bring down interface: %m");
link_enter_failed(link);
return 1;
}
r = link_set_can(link);
if (r < 0)
link_enter_failed(link);
return 1;
}
int link_configure_can(Link *link) {
int r;
link_set_state(link, LINK_STATE_CONFIGURING);
if (streq_ptr(link->kind, "can")) {
/* The CAN interface must be down to configure bitrate, etc... */
if ((link->flags & IFF_UP)) {
r = link_down(link, link_down_handler);
if (r < 0) {
link_enter_failed(link);
return r;
}
} else {
r = link_set_can(link);
if (r < 0) {
link_enter_failed(link);
return r;
}
}
return 0;
}
if (!(link->flags & IFF_UP)) {
r = link_up_can(link);
if (r < 0) {
link_enter_failed(link);
return r;
}
}
return 0;
}
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