lxc: add missing deps

Note - this PR is dependent on openwrt/openwrt#17553

Several deps are missing based the output of lxc-checkconfig shown below
before this commit is applied.

CONFIG_IP_NF_TARGET_MASQUERADE and CONFIG_IP6_NF_TARGET_MASQUERADE are
only needed for lxc-net which we do not package.

% lxc-checkconfig | grep missing
Cgroup device: missing
CONFIG_IP_NF_TARGET_MASQUERADE: missing
CONFIG_IP6_NF_TARGET_MASQUERADE: missing
CONFIG_NETFILTER_XT_TARGET_CHECKSUM: missing
FUSE (for use with lxcfs): missing
checkpoint restore: missing
CONFIG_UNIX_DIAG: missing
CONFIG_INET_DIAG: missing
CONFIG_PACKET_DIAG: missing
CONFIG_NETLINK_DIAG: missing

Additionally, two new patches have been added which remove checks for
options that OpenWrt currently does not package and can serve are
false positives for missing items from our kernel config, namely:
lxc-net and lxc-checkpoint

After applying this commit, below is the output showing that the kernel
config[1] should pass all tests for functionality:

% CONFIG=config ./lxc-checkconfig
LXC version 6.0.3

--- Namespaces ---
Namespaces: enabled
Utsname namespace: enabled
Ipc namespace: enabled
Pid namespace: enabled
User namespace: enabled
Network namespace: enabled
Namespace limits:
  cgroup: 383849
  ipc: 383849
  mnt: 383849
  net: 383849
  pid: 383849
  time: 383849
  user: 383849
  uts: 383849

--- Control groups ---
Cgroups: enabled
Cgroup namespace: enabled
Cgroup v1 mount points:
Cgroup v2 mount points:
 - /sys/fs/cgroup
Cgroup device: enabled
Cgroup sched: enabled
Cgroup cpu account: enabled
Cgroup memory controller: enabled
Cgroup cpuset: enabled

--- Misc ---
Veth pair device: enabled, loaded
Macvlan: enabled, not loaded
Vlan: enabled, not loaded
Bridges: enabled, loaded
Advanced netfilter: enabled, loaded
CONFIG_NETFILTER_XT_TARGET_CHECKSUM: enabled, not loaded
CONFIG_NETFILTER_XT_MATCH_COMMENT: enabled, loaded

--- Checkpoint/Restore ---
checkpoint restore: missing
CONFIG_FHANDLE: enabled
CONFIG_EVENTFD: enabled
CONFIG_EPOLL: enabled
CONFIG_UNIX_DIAG: enabled
CONFIG_INET_DIAG: enabled
CONFIG_PACKET_DIAG: enabled
CONFIG_NETLINK_DIAG: enabled
File capabilities: enabled

1. Generated on 23-Feb-2025 running bcm27xx/bcm2712 on r28869+1

Signed-off-by: John Audia <[email protected]>

utils/lxc/Config.in

@@ -8,6 +8,7 @@ config LXC_KERNEL_OPTIONS
 	select KERNEL_NAMESPACES
 	select KERNEL_DEVPTS_MULTIPLE_INSTANCES
 	select KERNEL_POSIX_MQUEUE
+	select KERNEL_CGROUP_DEVICE
 	select KERNEL_CGROUP_SCHED
 	select KERNEL_FAIR_GROUP_SCHED
 	select KERNEL_RT_GROUP_SCHED
@@ -16,6 +17,7 @@ config LXC_KERNEL_OPTIONS
 	select KERNEL_MEMCG_KMEM
 	select KERNEL_CPUSETS
 	select PACKAGE_kmod-ikconfig
+	select PACKAGE_kmod-unix-diag
 	help
 	  Select needed kernel options for LXC related utilities. Options
 	  include cgroups, namespaces and other miscellaneous options. These
@@ -50,6 +52,10 @@ config LXC_NETWORKING
 	default n
 	select PACKAGE_kmod-veth
 	select PACKAGE_kmod-macvlan
+	select PACKAGE_kmod-inet-diag
+	select PACKAGE_kmod-ipt-checksum
+	select PACKAGE_kmod-netlink-diag
+	select PACKAGE_kmod-packet-diag
 	help
 	  Enable "veth pair device" and "macvlan"
 

utils/lxc/patches/015-lxc-checkconfig-remove-options-for-lxc-checkpoint.patch

@@ -0,0 +1,12 @@
+--- a/src/lxc/cmd/lxc-checkconfig.in
++++ b/src/lxc/cmd/lxc-checkconfig.in
+@@ -256,9 +256,6 @@ printf "CONFIG_NETFILTER_XT_MATCH_COMMEN
+ echo
+
+ echo "
+---- Checkpoint/Restore ---"
+-printf "checkpoint restore: " && is_enabled CONFIG_CHECKPOINT_RESTORE
+-echo
+ printf "CONFIG_FHANDLE: " && is_enabled CONFIG_FHANDLE
+ echo
+ printf "CONFIG_EVENTFD: " && is_enabled CONFIG_EVENTFD