2022-09-11 17:50:33

by Michael Weiß

Subject: [PATCH 0/2] net: openvswitch: metering and conntrack in userns

Currently using openvswitch in a non-inital user namespace, e.g., an
unprivileged container, is possible but without metering and conntrack
support. This is due to the restriction of the corresponding Netlink
interfaces to the global CAP_NET_ADMIN.

This simple patches switch from GENL_ADMIN_PERM to GENL_UNS_ADMIN_PERM
in several cases to allow this also for the unprivilegd container
use case.

We tested this for unprivileged containers created by the container
manager of GyroidOS (gyroidos.github.io). However, for other container
managers such as LXC or systemd which provide unprivileged containers
this should be apply equally.

Applies against v6.0-rc4

Michael Weiß (2):
net: openvswitch: allow metering in non-initial user namespace
net: openvswitch: allow conntrack in non-initial user namespace

net/openvswitch/conntrack.c | 8 ++++----
net/openvswitch/meter.c | 12 ++++++------
2 files changed, 10 insertions(+), 10 deletions(-)

--
2.30.2

2022-09-11 17:51:13

by Michael Weiß

Subject: [PATCH 2/2] net: openvswitch: allow conntrack in non-initial user namespace

Similar to the previous commit, the Netlink interface of the OVS
conntrack module was restricted to global CAP_NET_ADMIN by using
GENL_ADMIN_PERM. This is changed to GENL_UNS_ADMIN_PERM to support
unprivileged containers in non-initial user namespace.

Signed-off-by: Michael Weiß <[email protected]>
---
net/openvswitch/conntrack.c | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/net/openvswitch/conntrack.c b/net/openvswitch/conntrack.c
index 4e70df91d0f2..23f5b6261364 100644
--- a/net/openvswitch/conntrack.c
+++ b/net/openvswitch/conntrack.c
@@ -2252,14 +2252,14 @@ static int ovs_ct_limit_cmd_get(struct sk_buff *skb, struct genl_info *info)
static const struct genl_small_ops ct_limit_genl_ops[] = {
{ .cmd = OVS_CT_LIMIT_CMD_SET,
.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
- .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN
- * privilege. */
+ .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN
+ * privilege. */
.doit = ovs_ct_limit_cmd_set,
},
{ .cmd = OVS_CT_LIMIT_CMD_DEL,
.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
- .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN
- * privilege. */
+ .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN
+ * privilege. */
.doit = ovs_ct_limit_cmd_del,
},
{ .cmd = OVS_CT_LIMIT_CMD_GET,
--
2.30.2