int bt_mesh_trans_send()

in nimble/host/mesh/src/transport.c [625:695]

• 58 lines of code
• 15 McCabe index (conditional complexity)

int bt_mesh_trans_send(struct bt_mesh_net_tx *tx, struct os_mbuf *msg,
		       const struct bt_mesh_send_cb *cb, void *cb_data)
{
	const uint8_t *key;
	uint8_t aid;
	int err;

	if (msg->om_len < 1) {
		BT_ERR("Zero-length SDU not allowed");
		return -EINVAL;
	}

	if (msg->om_len > BT_MESH_TX_SDU_MAX - BT_MESH_MIC_SHORT) {
		BT_ERR("Message too big: %u", msg->om_len);
		return -EMSGSIZE;
	}

	if (net_buf_simple_tailroom(msg) < BT_MESH_MIC_SHORT) {
		BT_ERR("Insufficient tailroom for Transport MIC");
		return -EINVAL;
	}

	if (tx->ctx->send_ttl == BT_MESH_TTL_DEFAULT) {
		tx->ctx->send_ttl = bt_mesh_default_ttl_get();
	} else if (tx->ctx->send_ttl > BT_MESH_TTL_MAX) {
		BT_ERR("TTL too large (max 127)");
		return -EINVAL;
	}

	if (msg->om_len > BT_MESH_SDU_UNSEG_MAX) {
		tx->ctx->send_rel = true;
	}

	if (tx->ctx->addr == BT_MESH_ADDR_UNASSIGNED ||
	    (!BT_MESH_ADDR_IS_UNICAST(tx->ctx->addr) &&
	     BT_MESH_IS_DEV_KEY(tx->ctx->app_idx))) {
		BT_ERR("Invalid destination address");
		return -EINVAL;
	}

	err = bt_mesh_keys_resolve(tx->ctx, &tx->sub, &key, &aid);
	if (err) {
		return err;
	}

	BT_DBG("net_idx 0x%04x app_idx 0x%04x dst 0x%04x", tx->sub->net_idx,
	       tx->ctx->app_idx, tx->ctx->addr);
	BT_DBG("len %u: %s", msg->om_len, bt_hex(msg->om_data, msg->om_len));

	tx->xmit = bt_mesh_net_transmit_get();
	tx->aid = aid;

	if (!tx->ctx->send_rel || net_buf_simple_tailroom(msg) < 8) {
		tx->aszmic = 0;
	} else {
		tx->aszmic = 1;
	}

	err = trans_encrypt(tx, key, msg);
	if (err) {
		return err;
	}

	if (tx->ctx->send_rel) {
		err = send_seg(tx, msg, cb, cb_data, NULL);
	} else {
		err = send_unseg(tx, msg, cb, cb_data, NULL);
	}

	return err;
}