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From 352cdb28eecbb57de3509b18dfc37dcce0455c01 Mon Sep 17 00:00:00 2001
From: ABC <abc@openwall.com>
Date: Tue, 22 Jun 2021 19:07:02 +0300
Subject: [PATCH 01/17] Fix compile for stable kernels by not using
'ref_module'
`ref_module' unexport in 7ef5264de7732 ("modules: mark ref_module
static") is back-ported into stable kernels making old `#if
LINUX_VERSION_CODE' checks irrelevant or too complicated to update.
Do not use `ref_module' API at all since `try_module_get' is ancient
enough to use always.
Reported-by: https://github.com/xtaran
Fixes: https://github.com/aabc/ipt-netflow/issues/177
---
compat.h | 4 ----
ipt_NETFLOW.c | 7 +------
2 files changed, 1 insertion(+), 10 deletions(-)
diff --git a/compat.h b/compat.h
index 99edf91..30f1d8f 100644
--- a/compat.h
+++ b/compat.h
@@ -170,10 +170,6 @@ static int __ethtool_get_settings(struct net_device *dev, struct ethtool_cmd *cm
# define CHECK_OK 0
#endif
-#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,35)
-# define use_module ref_module
-#endif
-
#ifndef NF_IP_LOCAL_IN /* 2.6.25 */
# define NF_IP_PRE_ROUTING NF_INET_PRE_ROUTING
# define NF_IP_LOCAL_IN NF_INET_LOCAL_IN
diff --git a/ipt_NETFLOW.c b/ipt_NETFLOW.c
index d3d3901..c4c049d 100644
--- a/ipt_NETFLOW.c
+++ b/ipt_NETFLOW.c
@@ -5494,12 +5494,8 @@ static void register_ct_events(void)
}
/* Reference netlink module to prevent it's unsafe unload before us. */
if (!netlink_m && (netlink_m = find_module(NETLINK_M))) {
-#if LINUX_VERSION_CODE < KERNEL_VERSION(5,9,0)
- use_module(THIS_MODULE, netlink_m);
-#else
if (!try_module_get(netlink_m))
netlink_m = NULL;
-#endif
}
/* Register ct events callback. */
@@ -5527,10 +5523,9 @@ static void unregister_ct_events(void)
#else /* < v3.2 */
unset_notifier_cb();
#endif /* v3.2 */
-#if LINUX_VERSION_CODE >= KERNEL_VERSION(5,9,0)
module_put(netlink_m);
netlink_m = NULL;
-#endif
+
rcu_assign_pointer(saved_event_cb, NULL);
#else /* < v2.6.31 */
nf_conntrack_unregister_notifier(&ctnl_notifier);
--
2.39.5
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