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/* SPDX-License-Identifier: LGPL-2.1-or-later */
#include <net/if.h>
#include <linux/can/netlink.h>
#include "networkd-can.h"
#include "networkd-link.h"
#include "networkd-network.h"
#include "networkd-setlink.h"
#include "parse-util.h"
#include "string-util.h"
#define CAN_TERMINATION_DEFAULT_OHM_VALUE 120
int can_set_netlink_message(Link *link, sd_netlink_message *m) {
int r;
assert(link);
assert(link->network);
assert(m);
r = sd_netlink_message_set_flags(m, NLM_F_REQUEST | NLM_F_ACK);
if (r < 0)
return log_link_debug_errno(link, r, "Could not set netlink flags: %m");
r = sd_netlink_message_open_container(m, IFLA_LINKINFO);
if (r < 0)
return log_link_debug_errno(link, r, "Failed to open IFLA_LINKINFO container: %m");
r = sd_netlink_message_open_container_union(m, IFLA_INFO_DATA, link->kind);
if (r < 0)
return log_link_debug_errno(link, r, "Could not open IFLA_INFO_DATA container: %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,
};
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_debug_errno(link, r, "Could not append IFLA_CAN_BITTIMING attribute: %m");
}
if (link->network->can_data_bitrate > 0 || link->network->can_data_sample_point > 0) {
struct can_bittiming bt = {
.bitrate = link->network->can_data_bitrate,
.sample_point = link->network->can_data_sample_point,
};
log_link_debug(link, "Setting data bitrate = %d bit/s", bt.bitrate);
if (link->network->can_data_sample_point > 0)
log_link_debug(link, "Setting data sample point = %d.%d%%", bt.sample_point / 10, bt.sample_point % 10);
else
log_link_debug(link, "Using default data sample point");
r = sd_netlink_message_append_data(m, IFLA_CAN_DATA_BITTIMING, &bt, sizeof(bt));
if (r < 0)
return log_link_debug_errno(link, r, "Could not append IFLA_CAN_DATA_BITTIMING attribute: %m");
}
if (link->network->can_restart_us > 0) {
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);
log_link_debug(link, "Setting restart = %s", FORMAT_TIMESPAN(restart_ms * 1000, MSEC_PER_SEC));
r = sd_netlink_message_append_u32(m, IFLA_CAN_RESTART_MS, restart_ms);
if (r < 0)
return log_link_debug_errno(link, r, "Could not append IFLA_CAN_RESTART_MS attribute: %m");
}
if (link->network->can_control_mode_mask != 0) {
struct can_ctrlmode cm = {
.mask = link->network->can_control_mode_mask,
.flags = link->network->can_control_mode_flags,
};
r = sd_netlink_message_append_data(m, IFLA_CAN_CTRLMODE, &cm, sizeof(cm));
if (r < 0)
return log_link_debug_errno(link, r, "Could not append IFLA_CAN_CTRLMODE attribute: %m");
}
if (link->network->can_termination_set) {
log_link_debug(link, "Setting can-termination to '%u'.", link->network->can_termination);
r = sd_netlink_message_append_u16(m, IFLA_CAN_TERMINATION, link->network->can_termination);
if (r < 0)
return log_link_debug_errno(link, r, "Could not append IFLA_CAN_TERMINATION attribute: %m");
}
r = sd_netlink_message_close_container(m);
if (r < 0)
return log_link_debug_errno(link, r, "Failed to close IFLA_INFO_DATA container: %m");
r = sd_netlink_message_close_container(m);
if (r < 0)
return log_link_debug_errno(link, r, "Failed to close IFLA_LINKINFO container: %m");
return 0;
}
int config_parse_can_bitrate(
const char* unit,
const char *filename,
unsigned line,
const char *section,
unsigned section_line,
const char *lvalue,
int ltype,
const char *rvalue,
void *data,
void *userdata) {
uint32_t *br = data;
uint64_t sz;
int r;
assert(filename);
assert(lvalue);
assert(rvalue);
assert(data);
r = parse_size(rvalue, 1000, &sz);
if (r < 0) {
log_syntax(unit, LOG_WARNING, filename, line, r,
"Failed to parse can bitrate '%s', ignoring: %m", rvalue);
return 0;
}
/* Linux uses __u32 for bitrates, so the value should not exceed that. */
if (sz <= 0 || sz > UINT32_MAX) {
log_syntax(unit, LOG_WARNING, filename, line, 0,
"Bit rate out of permitted range 1...4294967295");
return 0;
}
*br = (uint32_t) sz;
return 0;
}
int config_parse_can_restart_usec(
const char* unit,
const char *filename,
unsigned line,
const char *section,
unsigned section_line,
const char *lvalue,
int ltype,
const char *rvalue,
void *data,
void *userdata) {
usec_t usec, *restart_usec = data;
int r;
assert(filename);
assert(lvalue);
assert(rvalue);
assert(data);
r = parse_sec(rvalue, &usec);
if (r < 0) {
log_syntax(unit, LOG_WARNING, filename, line, r,
"Failed to parse CAN restart sec '%s', ignoring: %m", rvalue);
return 0;
}
if (usec != USEC_INFINITY &&
DIV_ROUND_UP(usec, USEC_PER_MSEC) > UINT32_MAX) {
log_syntax(unit, LOG_WARNING, filename, line, 0,
"CAN RestartSec= must be in the range 0...%"PRIu32"ms, ignoring: %s", UINT32_MAX, rvalue);
return 0;
}
*restart_usec = usec;
return 0;
}
int config_parse_can_control_mode(
const char* unit,
const char *filename,
unsigned line,
const char *section,
unsigned section_line,
const char *lvalue,
int ltype,
const char *rvalue,
void *data,
void *userdata) {
Network *network = userdata;
uint32_t mask = ltype;
int r;
assert(filename);
assert(lvalue);
assert(rvalue);
assert(userdata);
assert(mask != 0);
if (isempty(rvalue)) {
network->can_control_mode_mask &= ~mask;
network->can_control_mode_flags &= ~mask;
return 0;
}
r = parse_boolean(rvalue);
if (r < 0) {
log_syntax(unit, LOG_WARNING, filename, line, r,
"Failed to parse CAN control mode '%s', ignoring: %s", lvalue, rvalue);
return 0;
}
network->can_control_mode_mask |= mask;
SET_FLAG(network->can_control_mode_flags, mask, r);
return 0;
}
int config_parse_can_termination(
const char* unit,
const char *filename,
unsigned line,
const char *section,
unsigned section_line,
const char *lvalue,
int ltype,
const char *rvalue,
void *data,
void *userdata) {
Network *network = userdata;
int r;
assert(filename);
assert(lvalue);
assert(rvalue);
assert(data);
if (isempty(rvalue)) {
network->can_termination_set = false;
return 0;
}
/* Note that 0 termination ohm value means no termination resistor, and there is no conflict
* between parse_boolean() and safe_atou16() when Termination=0. However, Termination=1 must be
* treated as 1 ohm, instead of true (and then the default ohm value). So, we need to parse the
* string with safe_atou16() at first. */
r = safe_atou16(rvalue, &network->can_termination);
if (r < 0) {
r = parse_boolean(rvalue);
if (r < 0) {
log_syntax(unit, LOG_WARNING, filename, line, r,
"Failed to parse CAN termination value, ignoring: %s", rvalue);
return 0;
}
network->can_termination = r ? CAN_TERMINATION_DEFAULT_OHM_VALUE : 0;
}
network->can_termination_set = true;
return 0;
}
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