[PATCH v2 1/1] netfilter: load nf_log_syslog on enabling nf_conntrack_log_invalid

[Lance Yang <ioworker0@gmail.com>]

From: Lance Yang <lance.yang@linux.dev>

When no logger is registered, nf_conntrack_log_invalid fails to log invalid
packets, leaving users unaware of actual invalid traffic. Improve this by
loading nf_log_syslog, similar to how 'iptables -I FORWARD 1 -m conntrack
--ctstate INVALID -j LOG' triggers it.

Suggested-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Zi Li <zi.li@linux.dev>
Signed-off-by: Lance Yang <lance.yang@linux.dev>
---
v1 -> v2:
 - Add a new, simpler helper (per Florian)
 - Load the module only when no logger is registered (per Florian)
 - https://lore.kernel.org/all/20250514053751.2271-1-lance.yang@linux.dev/

 include/net/netfilter/nf_log.h          |  3 +++
 net/netfilter/nf_conntrack_standalone.c | 26 +++++++++++++++++++++++-
 net/netfilter/nf_log.c                  | 27 +++++++++++++++++++++++++
 3 files changed, 55 insertions(+), 1 deletion(-)

diff --git a/include/net/netfilter/nf_log.h b/include/net/netfilter/nf_log.h
index e55eedc84ed7..00506792a06d 100644
--- a/include/net/netfilter/nf_log.h
+++ b/include/net/netfilter/nf_log.h
@@ -59,6 +59,9 @@ extern int sysctl_nf_log_all_netns;
 int nf_log_register(u_int8_t pf, struct nf_logger *logger);
 void nf_log_unregister(struct nf_logger *logger);
 
+/* Check if any logger is registered for a given protocol family. */
+bool nf_log_is_registered(u_int8_t pf);
+
 int nf_log_set(struct net *net, u_int8_t pf, const struct nf_logger *logger);
 void nf_log_unset(struct net *net, const struct nf_logger *logger);
 
diff --git a/net/netfilter/nf_conntrack_standalone.c b/net/netfilter/nf_conntrack_standalone.c
index 2f666751c7e7..cdc27424f84a 100644
--- a/net/netfilter/nf_conntrack_standalone.c
+++ b/net/netfilter/nf_conntrack_standalone.c
@@ -14,6 +14,7 @@
 #include <linux/sysctl.h>
 #endif
 
+#include <net/netfilter/nf_log.h>
 #include <net/netfilter/nf_conntrack.h>
 #include <net/netfilter/nf_conntrack_core.h>
 #include <net/netfilter/nf_conntrack_l4proto.h>
@@ -543,6 +544,29 @@ nf_conntrack_hash_sysctl(const struct ctl_table *table, int write,
 	return ret;
 }
 
+static int
+nf_conntrack_log_invalid_sysctl(const struct ctl_table *table, int write,
+				void *buffer, size_t *lenp, loff_t *ppos)
+{
+	int ret, i;
+
+	ret = proc_dou8vec_minmax(table, write, buffer, lenp, ppos);
+	if (ret < 0 || !write)
+		return ret;
+
+	if (*(u8 *)table->data == 0)
+		return ret;
+
+	/* Load nf_log_syslog only if no logger is currently registered */
+	for (i = 0; i < NFPROTO_NUMPROTO; i++) {
+		if (nf_log_is_registered(i))
+			return ret;
+	}
+	request_module("%s", "nf_log_syslog");
+
+	return ret;
+}
+
 static struct ctl_table_header *nf_ct_netfilter_header;
 
 enum nf_ct_sysctl_index {
@@ -649,7 +673,7 @@ static struct ctl_table nf_ct_sysctl_table[] = {
 		.data		= &init_net.ct.sysctl_log_invalid,
 		.maxlen		= sizeof(u8),
 		.mode		= 0644,
-		.proc_handler	= proc_dou8vec_minmax,
+		.proc_handler	= nf_conntrack_log_invalid_sysctl,
 	},
 	[NF_SYSCTL_CT_EXPECT_MAX] = {
 		.procname	= "nf_conntrack_expect_max",
diff --git a/net/netfilter/nf_log.c b/net/netfilter/nf_log.c
index 6dd0de33eebd..c7dd5019a89d 100644
--- a/net/netfilter/nf_log.c
+++ b/net/netfilter/nf_log.c
@@ -125,6 +125,33 @@ void nf_log_unregister(struct nf_logger *logger)
 }
 EXPORT_SYMBOL(nf_log_unregister);
 
+/**
+ * nf_log_is_registered - Check if any logger is registered for a given
+ * protocol family.
+ *
+ * @pf: Protocol family
+ *
+ * Returns: true if at least one logger is active for @pf, false otherwise.
+ */
+bool nf_log_is_registered(u_int8_t pf)
+{
+	int i;
+
+	/* Out of bounds. */
+	if (pf >= NFPROTO_NUMPROTO) {
+		WARN_ON_ONCE(1);
+		return false;
+	}
+
+	for (i = 0; i < NF_LOG_TYPE_MAX; i++) {
+		if (rcu_access_pointer(loggers[pf][i]))
+			return true;
+	}
+
+	return false;
+}
+EXPORT_SYMBOL(nf_log_is_registered);
+
 int nf_log_bind_pf(struct net *net, u_int8_t pf,
 		   const struct nf_logger *logger)
 {
-- 
2.49.0