lxc: support <interface type='ethernet'>

This is identical to type='bridge', but without the "connect to a
bridge" part, so it can be handled by using the same functions (and
often even the same cases in switch statements), after renaming
virLXCProcessSetupInterfaceBridged() to virLXCProcessInterfaceTap()
and enhancing it to skip bridge-related items when brname == NULL.

To be truly useful, we need to support setting the ip address on the
host side veth as well as guest side veth (already supported for
type='bridge'), as well as setting the peer address for both.

The <script> element (supported by type='ethernet' in qemu) isn't
supported in this patch. An error is logged at domain start time if it
is encountered. This may be changed in a later patch.

tests/lxcconf2xmldata/lxcconf2xml-ethernet.config

@@ -0,0 +1,44 @@
+# Template used to create this container: opensuse
+# Template script checksum (SHA-1): 27307e0a95bd81b2c0bd82d6f87fdbe83be075ef
+
+lxc.network.type = veth
+lxc.network.flags = up
+lxc.network.hwaddr = 02:00:15:8f:05:c1
+lxc.network.name = eth0
+lxc.network.ipv4 = 192.168.122.2/24
+lxc.network.ipv4.gateway = 192.168.122.1
+lxc.network.ipv6 = 2003:db8:1:0:214:1234:fe0b:3596/64
+lxc.network.ipv6.gateway = 2003:db8:1:0:214:1234:fe0b:3595
+
+#remove next line if host DNS configuration should not be available to container
+lxc.mount.entry = proc proc proc nodev,noexec,nosuid 0 0
+lxc.mount.entry = sysfs sys sysfs defaults  0 0
+lxc.mount.entry = tmpfs run tmpfs size=8m,mode=0755,nodev,nosuid 0 0
+lxc.mount.entry = /etc/resolv.conf etc/resolv.conf none bind,ro 0 0
+lxc.rootfs = /var/lib/lxc/migrate_test/rootfs
+lxc.utsname = migrate_test
+lxc.arch = x86
+lxc.autodev=1
+lxc.tty = 2
+lxc.pts = 1024
+lxc.cap.drop = sys_module mac_admin mac_override mknod
+
+# When using LXC with apparmor, uncomment the next line to run unconfined:
+#lxc.aa_profile = unconfined
+
+lxc.cgroup.devices.deny = a
+# /dev/null and zero
+lxc.cgroup.devices.allow = c 1:3 rwm
+lxc.cgroup.devices.allow = c 1:5 rwm
+# consoles
+lxc.cgroup.devices.allow = c 5:1 rwm
+lxc.cgroup.devices.allow = c 5:0 rwm
+lxc.cgroup.devices.allow = c 4:0 rwm
+lxc.cgroup.devices.allow = c 4:1 rwm
+# /dev/{,u}random
+lxc.cgroup.devices.allow = c 1:9 rwm
+lxc.cgroup.devices.allow = c 1:8 rwm
+lxc.cgroup.devices.allow = c 136:* rwm
+lxc.cgroup.devices.allow = c 5:2 rwm
+# rtc
+lxc.cgroup.devices.allow = c 254:0 rwm

tests/lxcconf2xmldata/lxcconf2xml-ethernet.xml

@@ -0,0 +1,54 @@
+<domain type='lxc'>
+  <name>migrate_test</name>
+  <uuid>c7a5fdbd-edaf-9455-926a-d65c16db1809</uuid>
+  <memory unit='KiB'>65536</memory>
+  <currentMemory unit='KiB'>65536</currentMemory>
+  <vcpu placement='static'>1</vcpu>
+  <os>
+    <type arch='i686'>exe</type>
+    <init>/sbin/init</init>
+  </os>
+  <features>
+    <capabilities policy='allow'>
+      <mac_admin state='off'/>
+      <mac_override state='off'/>
+      <mknod state='off'/>
+      <sys_module state='off'/>
+    </capabilities>
+  </features>
+  <clock offset='utc'/>
+  <on_poweroff>destroy</on_poweroff>
+  <on_reboot>restart</on_reboot>
+  <on_crash>destroy</on_crash>
+  <devices>
+    <emulator>/usr/libexec/libvirt_lxc</emulator>
+    <filesystem type='mount' accessmode='passthrough'>
+      <source dir='/var/lib/lxc/migrate_test/rootfs'/>
+      <target dir='/'/>
+    </filesystem>
+    <filesystem type='ram' accessmode='passthrough'>
+      <source usage='8192' units='KiB'/>
+      <target dir='/run'/>
+    </filesystem>
+    <filesystem type='mount' accessmode='passthrough'>
+      <source dir='/etc/resolv.conf'/>
+      <target dir='/etc/resolv.conf'/>
+      <readonly/>
+    </filesystem>
+    <interface type='ethernet'>
+      <mac address='02:00:15:8f:05:c1'/>
+      <ip address='192.168.122.2' family='ipv4' prefix='24'/>
+      <ip address='2003:db8:1:0:214:1234:fe0b:3596' family='ipv6' prefix='64'/>
+      <route family='ipv4' address='0.0.0.0' gateway='192.168.122.1'/>
+      <route family='ipv6' address='::' gateway='2003:db8:1:0:214:1234:fe0b:3595'/>
+      <guest dev='eth0'/>
+      <link state='up'/>
+    </interface>
+    <console type='pty'>
+      <target type='lxc' port='0'/>
+    </console>
+    <console type='pty'>
+      <target type='lxc' port='1'/>
+    </console>
+  </devices>
+</domain>