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-rw-r--r--src/network/networkd-can.c336
1 files changed, 336 insertions, 0 deletions
diff --git a/src/network/networkd-can.c b/src/network/networkd-can.c
new file mode 100644
index 0000000..b8a1871
--- /dev/null
+++ b/src/network/networkd-can.c
@@ -0,0 +1,336 @@
+/* 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 r;
+
+ r = sd_netlink_message_open_container(m, IFLA_LINKINFO);
+ if (r < 0)
+ return r;
+
+ r = sd_netlink_message_open_container_union(m, IFLA_INFO_DATA, link->kind);
+ if (r < 0)
+ return r;
+
+ if (link->network->can_bitrate > 0) {
+ struct can_bittiming bt = {
+ .bitrate = link->network->can_bitrate,
+ .sample_point = link->network->can_sample_point,
+ .sjw = link->network->can_sync_jump_width,
+ };
+
+ log_link_debug(link, "Setting bitrate = %u bit/s", bt.bitrate);
+ if (link->network->can_sample_point > 0)
+ log_link_debug(link, "Setting sample point = %u.%u%%", 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 r;
+ } else if (link->network->can_time_quanta_ns > 0) {
+ struct can_bittiming bt = {
+ .tq = link->network->can_time_quanta_ns,
+ .prop_seg = link->network->can_propagation_segment,
+ .phase_seg1 = link->network->can_phase_buffer_segment_1,
+ .phase_seg2 = link->network->can_phase_buffer_segment_2,
+ .sjw = link->network->can_sync_jump_width,
+ };
+
+ log_link_debug(link, "Setting time quanta = %"PRIu32" nsec", bt.tq);
+ r = sd_netlink_message_append_data(m, IFLA_CAN_BITTIMING, &bt, sizeof(bt));
+ if (r < 0)
+ return r;
+ }
+
+ if (link->network->can_data_bitrate > 0) {
+ struct can_bittiming bt = {
+ .bitrate = link->network->can_data_bitrate,
+ .sample_point = link->network->can_data_sample_point,
+ .sjw = link->network->can_data_sync_jump_width,
+ };
+
+ log_link_debug(link, "Setting data bitrate = %u bit/s", bt.bitrate);
+ if (link->network->can_data_sample_point > 0)
+ log_link_debug(link, "Setting data sample point = %u.%u%%", 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 r;
+ } else if (link->network->can_data_time_quanta_ns > 0) {
+ struct can_bittiming bt = {
+ .tq = link->network->can_data_time_quanta_ns,
+ .prop_seg = link->network->can_data_propagation_segment,
+ .phase_seg1 = link->network->can_data_phase_buffer_segment_1,
+ .phase_seg2 = link->network->can_data_phase_buffer_segment_2,
+ .sjw = link->network->can_data_sync_jump_width,
+ };
+
+ log_link_debug(link, "Setting data time quanta = %"PRIu32" nsec", bt.tq);
+ r = sd_netlink_message_append_data(m, IFLA_CAN_DATA_BITTIMING, &bt, sizeof(bt));
+ if (r < 0)
+ return r;
+ }
+
+ 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 r;
+ }
+
+ 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 r;
+ }
+
+ 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 r;
+ }
+
+ r = sd_netlink_message_close_container(m);
+ if (r < 0)
+ return r;
+
+ r = sd_netlink_message_close_container(m);
+ if (r < 0)
+ return r;
+
+ 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 = ASSERT_PTR(data);
+ uint64_t sz;
+ int r;
+
+ assert(filename);
+ assert(lvalue);
+ assert(rvalue);
+
+ 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_time_quanta(
+ 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) {
+
+ nsec_t val, *tq = ASSERT_PTR(data);
+ int r;
+
+ assert(filename);
+ assert(lvalue);
+ assert(rvalue);
+
+ r = parse_nsec(rvalue, &val);
+ if (r < 0) {
+ log_syntax(unit, LOG_WARNING, filename, line, r,
+ "Failed to parse can time quanta '%s', ignoring: %m", rvalue);
+ return 0;
+ }
+
+ /* Linux uses __u32 for bitrates, so the value should not exceed that. */
+ if (val <= 0 || val > UINT32_MAX) {
+ log_syntax(unit, LOG_WARNING, filename, line, 0,
+ "Time quanta out of permitted range 1...4294967295");
+ return 0;
+ }
+
+ *tq = val;
+ 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 = ASSERT_PTR(data);
+ int r;
+
+ assert(filename);
+ assert(lvalue);
+ assert(rvalue);
+
+ 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 = ASSERT_PTR(userdata);
+ uint32_t mask = ltype;
+ int r;
+
+ assert(filename);
+ assert(lvalue);
+ assert(rvalue);
+ 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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