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core: implement RestrictNetworkInterfaces=

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This commit introduces all the logic to load and attach the BPF
programs to restrict network interfaces when a unit specifying it is
loaded.

Signed-off-by: Mauricio Vásquez <mauricio@kinvolk.io>
This commit is contained in:
Mauricio Vásquez
2021-08-18 15:55:53 -05:00
parent dc83b840d3
commit 6f50d4f7d6
10 changed files with 297 additions and 1 deletions
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src/basic/cgroup-util.h
+3 -1
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@@ -32,6 +32,7 @@ typedef enum CGroupController {
CGROUP_CONTROLLER_BPF_DEVICES,
CGROUP_CONTROLLER_BPF_FOREIGN,
CGROUP_CONTROLLER_BPF_SOCKET_BIND,
CGROUP_CONTROLLER_BPF_RESTRICT_NETWORK_INTERFACES,
_CGROUP_CONTROLLER_MAX,
_CGROUP_CONTROLLER_INVALID = -EINVAL,
@@ -53,6 +54,7 @@ typedef enum CGroupMask {
CGROUP_MASK_BPF_DEVICES = CGROUP_CONTROLLER_TO_MASK(CGROUP_CONTROLLER_BPF_DEVICES),
CGROUP_MASK_BPF_FOREIGN = CGROUP_CONTROLLER_TO_MASK(CGROUP_CONTROLLER_BPF_FOREIGN),
CGROUP_MASK_BPF_SOCKET_BIND = CGROUP_CONTROLLER_TO_MASK(CGROUP_CONTROLLER_BPF_SOCKET_BIND),
CGROUP_MASK_BPF_RESTRICT_NETWORK_INTERFACES = CGROUP_CONTROLLER_TO_MASK(CGROUP_CONTROLLER_BPF_RESTRICT_NETWORK_INTERFACES),
/* All real cgroup v1 controllers */
CGROUP_MASK_V1 = CGROUP_MASK_CPU|CGROUP_MASK_CPUACCT|CGROUP_MASK_BLKIO|CGROUP_MASK_MEMORY|CGROUP_MASK_DEVICES|CGROUP_MASK_PIDS,
@@ -61,7 +63,7 @@ typedef enum CGroupMask {
CGROUP_MASK_V2 = CGROUP_MASK_CPU|CGROUP_MASK_CPUSET|CGROUP_MASK_IO|CGROUP_MASK_MEMORY|CGROUP_MASK_PIDS,
/* All cgroup v2 BPF pseudo-controllers */
CGROUP_MASK_BPF = CGROUP_MASK_BPF_FIREWALL|CGROUP_MASK_BPF_DEVICES|CGROUP_MASK_BPF_FOREIGN|CGROUP_MASK_BPF_SOCKET_BIND,
CGROUP_MASK_BPF = CGROUP_MASK_BPF_FIREWALL|CGROUP_MASK_BPF_DEVICES|CGROUP_MASK_BPF_FOREIGN|CGROUP_MASK_BPF_SOCKET_BIND|CGROUP_MASK_BPF_RESTRICT_NETWORK_INTERFACES,
_CGROUP_MASK_ALL = CGROUP_CONTROLLER_TO_MASK(_CGROUP_CONTROLLER_MAX) - 1
} CGroupMask;