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Message-Id: <20250522165238.378456-26-pablo@netfilter.org>
Date: Thu, 22 May 2025 18:52:37 +0200
From: Pablo Neira Ayuso <pablo@...filter.org>
To: netfilter-devel@...r.kernel.org
Cc: davem@...emloft.net,
netdev@...r.kernel.org,
kuba@...nel.org,
pabeni@...hat.com,
edumazet@...gle.com,
fw@...len.de,
horms@...nel.org
Subject: [PATCH net-next 25/26] netfilter: nf_tables: Add notifications for hook changes
From: Phil Sutter <phil@....cc>
Notify user space if netdev hooks are updated due to netdev add/remove
events. Send minimal notification messages by introducing
NFT_MSG_NEWDEV/DELDEV message types describing a single device only.
Upon NETDEV_CHANGENAME, the callback has no information about the
interface's old name. To provide a clear message to user space, include
the hook's stored interface name in the notification.
Signed-off-by: Phil Sutter <phil@....cc>
Signed-off-by: Pablo Neira Ayuso <pablo@...filter.org>
---
include/net/netfilter/nf_tables.h | 5 ++
include/uapi/linux/netfilter/nf_tables.h | 10 ++++
include/uapi/linux/netfilter/nfnetlink.h | 2 +
net/netfilter/nf_tables_api.c | 59 ++++++++++++++++++++++++
net/netfilter/nfnetlink.c | 1 +
net/netfilter/nft_chain_filter.c | 2 +
6 files changed, 79 insertions(+)
diff --git a/include/net/netfilter/nf_tables.h b/include/net/netfilter/nf_tables.h
index 5e49619ae49c..e4d8e451e935 100644
--- a/include/net/netfilter/nf_tables.h
+++ b/include/net/netfilter/nf_tables.h
@@ -1142,6 +1142,11 @@ int nft_set_catchall_validate(const struct nft_ctx *ctx, struct nft_set *set);
int nf_tables_bind_chain(const struct nft_ctx *ctx, struct nft_chain *chain);
void nf_tables_unbind_chain(const struct nft_ctx *ctx, struct nft_chain *chain);
+struct nft_hook;
+void nf_tables_chain_device_notify(const struct nft_chain *chain,
+ const struct nft_hook *hook,
+ const struct net_device *dev, int event);
+
enum nft_chain_types {
NFT_CHAIN_T_DEFAULT = 0,
NFT_CHAIN_T_ROUTE,
diff --git a/include/uapi/linux/netfilter/nf_tables.h b/include/uapi/linux/netfilter/nf_tables.h
index 2beb30be2c5f..518ba144544c 100644
--- a/include/uapi/linux/netfilter/nf_tables.h
+++ b/include/uapi/linux/netfilter/nf_tables.h
@@ -142,6 +142,8 @@ enum nf_tables_msg_types {
NFT_MSG_DESTROYOBJ,
NFT_MSG_DESTROYFLOWTABLE,
NFT_MSG_GETSETELEM_RESET,
+ NFT_MSG_NEWDEV,
+ NFT_MSG_DELDEV,
NFT_MSG_MAX,
};
@@ -1784,10 +1786,18 @@ enum nft_synproxy_attributes {
* enum nft_device_attributes - nf_tables device netlink attributes
*
* @NFTA_DEVICE_NAME: name of this device (NLA_STRING)
+ * @NFTA_DEVICE_TABLE: table containing the flowtable or chain hooking into the device (NLA_STRING)
+ * @NFTA_DEVICE_FLOWTABLE: flowtable hooking into the device (NLA_STRING)
+ * @NFTA_DEVICE_CHAIN: chain hooking into the device (NLA_STRING)
+ * @NFTA_DEVICE_SPEC: hook spec matching the device (NLA_STRING)
*/
enum nft_devices_attributes {
NFTA_DEVICE_UNSPEC,
NFTA_DEVICE_NAME,
+ NFTA_DEVICE_TABLE,
+ NFTA_DEVICE_FLOWTABLE,
+ NFTA_DEVICE_CHAIN,
+ NFTA_DEVICE_SPEC,
__NFTA_DEVICE_MAX
};
#define NFTA_DEVICE_MAX (__NFTA_DEVICE_MAX - 1)
diff --git a/include/uapi/linux/netfilter/nfnetlink.h b/include/uapi/linux/netfilter/nfnetlink.h
index 6cd58cd2a6f0..50d807af2649 100644
--- a/include/uapi/linux/netfilter/nfnetlink.h
+++ b/include/uapi/linux/netfilter/nfnetlink.h
@@ -25,6 +25,8 @@ enum nfnetlink_groups {
#define NFNLGRP_ACCT_QUOTA NFNLGRP_ACCT_QUOTA
NFNLGRP_NFTRACE,
#define NFNLGRP_NFTRACE NFNLGRP_NFTRACE
+ NFNLGRP_NFT_DEV,
+#define NFNLGRP_NFT_DEV NFNLGRP_NFT_DEV
__NFNLGRP_MAX,
};
#define NFNLGRP_MAX (__NFNLGRP_MAX - 1)
diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c
index a7240736f98e..24c71ecb2179 100644
--- a/net/netfilter/nf_tables_api.c
+++ b/net/netfilter/nf_tables_api.c
@@ -9686,6 +9686,64 @@ struct nf_hook_ops *nft_hook_find_ops_rcu(const struct nft_hook *hook,
}
EXPORT_SYMBOL_GPL(nft_hook_find_ops_rcu);
+static void
+nf_tables_device_notify(const struct nft_table *table, int attr,
+ const char *name, const struct nft_hook *hook,
+ const struct net_device *dev, int event)
+{
+ struct net *net = dev_net(dev);
+ struct nlmsghdr *nlh;
+ struct sk_buff *skb;
+ u16 flags = 0;
+
+ if (!nfnetlink_has_listeners(net, NFNLGRP_NFT_DEV))
+ return;
+
+ skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
+ if (!skb)
+ goto err;
+
+ event = event == NETDEV_REGISTER ? NFT_MSG_NEWDEV : NFT_MSG_DELDEV;
+ event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
+ nlh = nfnl_msg_put(skb, 0, 0, event, flags, table->family,
+ NFNETLINK_V0, nft_base_seq(net));
+ if (!nlh)
+ goto err;
+
+ if (nla_put_string(skb, NFTA_DEVICE_TABLE, table->name) ||
+ nla_put_string(skb, attr, name) ||
+ nla_put(skb, NFTA_DEVICE_SPEC, hook->ifnamelen, hook->ifname) ||
+ nla_put_string(skb, NFTA_DEVICE_NAME, dev->name))
+ goto err;
+
+ nlmsg_end(skb, nlh);
+ nfnetlink_send(skb, net, 0, NFNLGRP_NFT_DEV,
+ nlmsg_report(nlh), GFP_KERNEL);
+ return;
+err:
+ if (skb)
+ kfree_skb(skb);
+ nfnetlink_set_err(net, 0, NFNLGRP_NFT_DEV, -ENOBUFS);
+}
+
+void
+nf_tables_chain_device_notify(const struct nft_chain *chain,
+ const struct nft_hook *hook,
+ const struct net_device *dev, int event)
+{
+ nf_tables_device_notify(chain->table, NFTA_DEVICE_CHAIN,
+ chain->name, hook, dev, event);
+}
+
+static void
+nf_tables_flowtable_device_notify(const struct nft_flowtable *ft,
+ const struct nft_hook *hook,
+ const struct net_device *dev, int event)
+{
+ nf_tables_device_notify(ft->table, NFTA_DEVICE_FLOWTABLE,
+ ft->name, hook, dev, event);
+}
+
static int nft_flowtable_event(unsigned long event, struct net_device *dev,
struct nft_flowtable *flowtable, bool changename)
{
@@ -9733,6 +9791,7 @@ static int nft_flowtable_event(unsigned long event, struct net_device *dev,
list_add_tail_rcu(&ops->list, &hook->ops_list);
break;
}
+ nf_tables_flowtable_device_notify(flowtable, hook, dev, event);
break;
}
return 0;
diff --git a/net/netfilter/nfnetlink.c b/net/netfilter/nfnetlink.c
index e598a2a252b0..ac77fc21632d 100644
--- a/net/netfilter/nfnetlink.c
+++ b/net/netfilter/nfnetlink.c
@@ -86,6 +86,7 @@ static const int nfnl_group2type[NFNLGRP_MAX+1] = {
[NFNLGRP_NFTABLES] = NFNL_SUBSYS_NFTABLES,
[NFNLGRP_ACCT_QUOTA] = NFNL_SUBSYS_ACCT,
[NFNLGRP_NFTRACE] = NFNL_SUBSYS_NFTABLES,
+ [NFNLGRP_NFT_DEV] = NFNL_SUBSYS_NFTABLES,
};
static struct nfnl_net *nfnl_pernet(struct net *net)
diff --git a/net/netfilter/nft_chain_filter.c b/net/netfilter/nft_chain_filter.c
index b16185e9a6dd..846d48ba8965 100644
--- a/net/netfilter/nft_chain_filter.c
+++ b/net/netfilter/nft_chain_filter.c
@@ -363,6 +363,8 @@ static int nft_netdev_event(unsigned long event, struct net_device *dev,
list_add_tail_rcu(&ops->list, &hook->ops_list);
break;
}
+ nf_tables_chain_device_notify(&basechain->chain,
+ hook, dev, event);
break;
}
return 0;
--
2.30.2
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