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net: advertise netns_immutable property via netlink

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Since commit 05c1280a2b ("netdev_features: convert NETIF_F_NETNS_LOCAL to
dev->netns_local"), there is no way to see if the netns_immutable property
s set on a device. Let's add a netlink attribute to advertise it.

Signed-off-by: Nicolas Dichtel <nicolas.dichtel@6wind.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: Alexander Lobakin <aleksander.lobakin@intel.com>
Reviewed-by: Kuniyuki Iwashima <kuniyu@amazon.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
This commit is contained in:
Nicolas Dichtel 2025-02-28 11:20:57 +01:00 committed by Paolo Abeni
parent 0c493da863
commit 4754affe0b
3 changed files with 7 additions and 0 deletions
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3
Documentation/netlink/specs/rt_link.yaml
View File

@ -1160,6 +1160,9 @@ attribute-sets:
name: max-pacing-offload-horizon
type: uint
doc: EDT offload horizon supported by the device (in nsec).
-
name: netns-immutable
type: u8
-
name: af-spec-attrs
attributes:

1
include/uapi/linux/if_link.h
View File

@ -378,6 +378,7 @@ enum {
IFLA_GRO_IPV4_MAX_SIZE,
IFLA_DPLL_PIN,
IFLA_MAX_PACING_OFFLOAD_HORIZON,
IFLA_NETNS_IMMUTABLE,
__IFLA_MAX
};

3
net/core/rtnetlink.c
View File

@ -1292,6 +1292,7 @@ static noinline size_t if_nlmsg_size(const struct net_device *dev,
+ nla_total_size(4) /* IFLA_TSO_MAX_SEGS */
+ nla_total_size(1) /* IFLA_OPERSTATE */
+ nla_total_size(1) /* IFLA_LINKMODE */
+ nla_total_size(1) /* IFLA_NETNS_IMMUTABLE */
+ nla_total_size(4) /* IFLA_CARRIER_CHANGES */
+ nla_total_size(4) /* IFLA_LINK_NETNSID */
+ nla_total_size(4) /* IFLA_GROUP */
@ -2046,6 +2047,7 @@ static int rtnl_fill_ifinfo(struct sk_buff *skb,
netif_running(dev) ? READ_ONCE(dev->operstate) :
IF_OPER_DOWN) ||
nla_put_u8(skb, IFLA_LINKMODE, READ_ONCE(dev->link_mode)) ||
nla_put_u8(skb, IFLA_NETNS_IMMUTABLE, dev->netns_immutable) ||
nla_put_u32(skb, IFLA_MTU, READ_ONCE(dev->mtu)) ||
nla_put_u32(skb, IFLA_MIN_MTU, READ_ONCE(dev->min_mtu)) ||
nla_put_u32(skb, IFLA_MAX_MTU, READ_ONCE(dev->max_mtu)) ||
@ -2234,6 +2236,7 @@ static const struct nla_policy ifla_policy[IFLA_MAX+1] = {
[IFLA_ALLMULTI] = { .type = NLA_REJECT },
[IFLA_GSO_IPV4_MAX_SIZE] = NLA_POLICY_MIN(NLA_U32, MAX_TCP_HEADER + 1),
[IFLA_GRO_IPV4_MAX_SIZE] = { .type = NLA_U32 },
[IFLA_NETNS_IMMUTABLE] = { .type = NLA_REJECT },
};
static const struct nla_policy ifla_info_policy[IFLA_INFO_MAX+1] = {