docs: add daemon internal documentationbg/device-doc

Add documentation about the implementation of the daemon.

3 files changed, 422 insertions, 0 deletions

diff --git a/docs/internal/daemon.drawio b/docs/internal/daemon.drawio
new file mode 100644
index 0000000000..1acb77dafa
--- /dev/null
+++ b/docs/internal/daemon.drawio
@@ -0,0 +1,253 @@
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diff --git a/docs/internal/daemon.md b/docs/internal/daemon.md
new file mode 100644
index 0000000000..b563dcddc6
--- /dev/null
+++ b/docs/internal/daemon.md
@@ -0,0 +1,169 @@
+NetworkManager daemon
+=====================
+
+The following diagram describes the main components of the
+NetworkManager daemon. Note that each component is in most cases a
+GObject and the names always start with the "NM" prefix, which has
+been omitted for clarity.
+
+![](daemon.png "")
+
+## Manager
+
+The main responsibilities of the manager are:
+
+- initialize all known device factories. A device factory contains the
+  logic detect new devices of a certain type and create the
+  corresponding object;
+
+- maintain a list of devices created by the factories;
+
+- maintain a list of active connections;
+
+- expose on D-Bus properties, methods and signal on the
+  `/org/freedesktop/NetworkManager`
+  [object](../../introspection/org.freedesktop.NetworkManager.xml).
+
+## Policy
+
+This object implements some policy decisions that involve multiple
+connection profiles, such as:
+
+ - it determines what is the best (with lowest metric) active
+   connection with default route for IPv4 and IPv6;
+
+ - it updates the DNS configuration in the DNS manager, also according
+   to what connection has the best default route;
+
+ - it handles the activation of secondary connections when a
+   connection goes up (see property `connection.secondaries` in
+   `man nm-settings`);
+
+ - it collects IPv6 prefix delegations from active connections, to
+   distribute them on connections using IPv6 shared mode;
+
+## Settings
+
+This object handles connection profiles; each profile is represented
+as a *SettingsConnection* object and is persisted to disk using one of
+the existing *SettingsPlugin*s such as keyfile, ifcfg-rh or
+ifupdown.
+
+It also controls *SecretAgent*s; an agent is an external service that
+registers to NetworkManager as capable of handling requests for new
+secrets. For example, when a Wi-Fi connection is activated and the
+password is missing or wrong, NetworkManager asks all registered
+agents for the missing secrets and then continues with
+activation. Examples of tools that register as agents are: nmcli,
+nmtui, GNOME shell, the GTK nm-applet and the KDE network applet.
+
+## Devices and device factories
+
+As mentioned before, NetworkManager instantiates device factories to
+discover and create new devices. Those factories are internal to the
+daemon or provided by a device plugin; a plugin is a dynamic library
+(shared object) that is loaded at runtime. NetworkManager uses plugins
+for optional functionality that depend on external software. In this
+way, it is possible to install a minimal version of NetworkManager
+with a limited set of dependencies. As there is no stable API/ABI for
+those plugins, they must be built together with the daemonq and
+maintained as part of NetworkManager.
+
+Currently the following device types are provided by plugins:
+
+ - Wi-Fi (depends on wpa_supplicant)
+ - OVS (depends on openswitch)
+ - PPP (depends on pppd)
+ - Bluetooth (depends on bluez)
+ - team (depends on teamd)
+
+When a device is activated, it relies on other objects:
+
+ - *L3cfg*: controls the IP configuration (address, routes, etc) on a
+    given ifindex, and also does IPv4 ACD (address conflict detection,
+    also know as DAD - duplicate address detection);
+ - *DhcpClient*: performs DHCPv4 and DHCPv6 on the interface; the
+    object has different implementations;
+ - *NDisc*: implements IPv6 SLAAC (stateless address
+    autoconfiguration, RFC 4861 and 4862); it supports acting both as
+    a host or a router for shared IPv6 mode;
+ - *LldpListener*: when the profile enables
+    [LLDP](https://en.wikipedia.org/wiki/Link_Layer_Discovery_Protocol)
+    via the `connection.lldp` property, this object sets up a socket
+    to listen for neighbors;
+ - *FirewalldManager*: talks with [firewalld](https://firewalld.org/)
+    to set the interface in the zone specified by the
+    `connection.zone` property;
+ - *BondManager*: used to configure bond devices in a special mode
+    (balance-slb) that requires the creation of nftables rules;
+
+For more information about the implementation of devices, see [this
+document](./device.md).
+
+## Platform
+
+*Platform* communicates with kernel to query and update the
+configuration of network interfaces; it uses netlink and implements
+the crafting and parsing of netlink message by itself without relying
+on external libraries such as libnl.
+
+Platform has two subclasses, *PlatformLinux* and a *PlatformFake*. The
+former is the one that contain the actual implementation while the
+latter is only used for unit testing.
+
+Note how the platform object has an incoming dotted arrow in the
+diagram, to represent that the object is used by several other
+objects.
+
+As mentioned, the purposes of platform are:
+
+ - perform operations such as adding or removing links, addresses,
+   routes, routing rules and other kernel entities
+
+ - allow querying the current state of the kernel configuration. To do
+   so, platform listens to kernel notifications and parses them to
+   build a cache of `NMPObject`s that is always up to date.
+
+NMPObject and its subtypes are also used through the core to represent
+information about addresses, routes, etc. Thus the cache of NMPlatform
+contains the currently configured objects in the netlink API, while
+other NMPObject instances are used for other tracking purposes.
+
+For these purposes platform uses two sockets, one with protocol
+NETLINK_ROUTE for regular operations about links, addresses, routes,
+etc. and a NETLINK_GENERIC socket to configure Wireguard and MPTCP.
+
+## Other objects
+
+The diagram shows other objects on the right side:
+
+ - *DnsManager*: merges all the DNS data received by multiple
+    interfaces and updates the system configuration. Besides directly
+    writing `/etc/resolv.conf`, it supports updating
+    `systemd-resolved` and `dnsmasq` via plugins.
+ 
+ - *HostnameManager*: implements reading and updating the system
+    hostname; by default it tries to do that by talking to
+    [systemd-hostnamed](https://www.freedesktop.org/wiki/Software/systemd/hostnamed/)
+    via D-Bus; in case it's not available, the hostname manager falls
+    back to reading and writing `/etc/hostname` directly.
+
+ - *RfkillManager*: enumerates RFKill devices and controls their status. See also
+    the [related page](https://networkmanager.dev/docs/rfkill/) on the website.
+
+ - *AuthManager*: is used to authenticate the API requests received by
+    the daemon. The authentication is done via
+    [Polkit](https://www.freedesktop.org/software/polkit/docs/latest/polkit.8.html)
+ 
+ - *DbusManager*: creates a connection to the system D-Bus instance
+    and allows exporting objects
+ 
+ - *SleepMonitor*: gets notifications for sleep and wake events by
+    registering to the available subsystem provided by the distro such
+    as systemd-logind, upower or ConsoleKit.
+    
+ - *SessionMonitor*: tracks which users have an active session by
+    using systemd-logind, elogind or ConsoleKit.
+
+ - *Dispatcher*: takes care of spawning dispatcher scripts by talking
+    to the `nm-dispatcher` service via D-Bus.
diff --git a/docs/internal/daemon.png b/docs/internal/daemon.png
new file mode 100644
index 0000000000..454c2ebc6e
--- /dev/null
+++ b/docs/internal/daemon.png