networkd: introduce netdev "Netdevsim" Driver

This "netdevsim" as implied by the name is a tool for network developers and is a simulator.
This simulated networking device is used for testing various networking APIs and at this time
is particularly focused on testing hardware offloading related interfaces.

5 files changed, 40 insertions, 0 deletions

diff --git a/src/network/meson.build b/src/network/meson.build
index e9ce2083ec..a717152e20 100644
--- a/src/network/meson.build
+++ b/src/network/meson.build
@@ -35,6 +35,8 @@ sources = files('''
         netdev/vxcan.h
         netdev/wireguard.c
         netdev/wireguard.h
+        netdev/netdevsim.c
+        netdev/netdevsim.h
         networkd-address-label.c
         networkd-address-label.h
         networkd-address-pool.c
diff --git a/src/network/netdev/netdev.c b/src/network/netdev/netdev.c
index a0b2697183..da6a50c5a2 100644
--- a/src/network/netdev/netdev.c
+++ b/src/network/netdev/netdev.c
@@ -37,6 +37,7 @@
 #include "netdev/vcan.h"
 #include "netdev/vxcan.h"
 #include "netdev/wireguard.h"
+#include "netdev/netdevsim.h"
 
 const NetDevVTable * const netdev_vtable[_NETDEV_KIND_MAX] = {
         [NETDEV_KIND_BRIDGE] = &bridge_vtable,
@@ -64,6 +65,7 @@ const NetDevVTable * const netdev_vtable[_NETDEV_KIND_MAX] = {
         [NETDEV_KIND_GENEVE] = &geneve_vtable,
         [NETDEV_KIND_VXCAN] = &vxcan_vtable,
         [NETDEV_KIND_WIREGUARD] = &wireguard_vtable,
+        [NETDEV_KIND_NETDEVSIM] = &netdevsim_vtable,
 };
 
 static const char* const netdev_kind_table[_NETDEV_KIND_MAX] = {
@@ -92,6 +94,7 @@ static const char* const netdev_kind_table[_NETDEV_KIND_MAX] = {
         [NETDEV_KIND_GENEVE] = "geneve",
         [NETDEV_KIND_VXCAN] = "vxcan",
         [NETDEV_KIND_WIREGUARD] = "wireguard",
+        [NETDEV_KIND_NETDEVSIM] = "netdevsim",
 };
 
 DEFINE_STRING_TABLE_LOOKUP(netdev_kind, NetDevKind);
diff --git a/src/network/netdev/netdev.h b/src/network/netdev/netdev.h
index 0d0671d37b..fa90b14f86 100644
--- a/src/network/netdev/netdev.h
+++ b/src/network/netdev/netdev.h
@@ -48,6 +48,7 @@ typedef enum NetDevKind {
         NETDEV_KIND_GENEVE,
         NETDEV_KIND_VXCAN,
         NETDEV_KIND_WIREGUARD,
+        NETDEV_KIND_NETDEVSIM,
         _NETDEV_KIND_MAX,
         _NETDEV_KIND_INVALID = -1
 } NetDevKind;
diff --git a/src/network/netdev/netdevsim.c b/src/network/netdev/netdevsim.c
new file mode 100644
index 0000000000..857a63f3de
--- /dev/null
+++ b/src/network/netdev/netdevsim.c
@@ -0,0 +1,15 @@
+/* SPDX-License-Identifier: LGPL-2.1+ */
+/***
+  This file is part of systemd.
+
+  Copyright 2018 Susant Sahani
+***/
+
+#include "netdev/netdevsim.h"
+#include "missing.h"
+
+const NetDevVTable netdevsim_vtable = {
+        .object_size = sizeof(NetDevSim),
+        .sections = "Match\0NetDev\0",
+        .create_type = NETDEV_CREATE_INDEPENDENT,
+};
diff --git a/src/network/netdev/netdevsim.h b/src/network/netdev/netdevsim.h
new file mode 100644
index 0000000000..1e560279ff
--- /dev/null
+++ b/src/network/netdev/netdevsim.h
@@ -0,0 +1,19 @@
+/* SPDX-License-Identifier: LGPL-2.1+ */
+#pragma once
+
+/***
+  This file is part of systemd.
+
+  Copyright 2018 Susant Sahani
+***/
+
+typedef struct NetDevSim NetDevSim;
+
+#include "netdev/netdev.h"
+
+struct NetDevSim {
+        NetDev meta;
+};
+
+DEFINE_NETDEV_CAST(NETDEVSIM, NetDevSim);
+extern const NetDevVTable netdevsim_vtable;