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mac80211: fix compilation error for old stable kernel version

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Fix compilation error for old stable version caused by
genlmsg_multicast_allns backport fix pushed middle version.

Version 5.15 version 0-169, 6.1 version 0-115, 6.6 version 0-58 have the
old genlmsg_multicast_allns version with flags variable.

Compiling backport project with these version result in a compilation
error. To handle this, introduce a backport function for the affected
kernel version.

Link: https://github.com/openwrt/openwrt/pull/18373
Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
This commit is contained in:
Christian Marangi 2025-03-29 13:12:44 +01:00
parent 8b27e60c58
commit 4039388149
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1 changed files with 121 additions and 0 deletions
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package/kernel/mac80211/patches/build/300-backports-handle-genlmsg_multicast_allns-upstream-ba.patch Normal file
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@ -0,0 +1,121 @@
From 8dc94a59cfad70ec3a808add56718255eee39ab2 Mon Sep 17 00:00:00 2001
From: Christian Marangi <ansuelsmth@gmail.com>
Date: Sat, 29 Mar 2025 12:50:55 +0100
Subject: [PATCH] backports: handle genlmsg_multicast_allns upstream backport
changes
Better handle genlmsg_multicast_allns upstream backport changes that
dropped a flag to the function middle version. Use a backport function
if backports project is tried to be built on older kernel version.
Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
---
backport-include/net/genetlink.h | 11 +++++
compat/Makefile | 3 +-
compat/backport-genetlink.c | 60 +++++++++++++++++++++++
3 files changed, 73 insertions(+), 1 deletion(-)
--- a/backport-include/net/genetlink.h
+++ b/backport-include/net/genetlink.h
@@ -172,4 +172,15 @@ static inline int genlmsg_parse(const st
}
#endif /* LINUX_VERSION_IS_LESS(5,2,0) */
+#if LINUX_VERSION_IN_RANGE(5,15,0,5,15,169) || \
+ LINUX_VERSION_IN_RANGE(6,1,0,6,1,115) || \
+ LINUX_VERSION_IN_RANGE(6,6,0,6,6,58)
+#define genlmsg_multicast_allns LINUX_BACKPORT(genlmsg_multicast_allns)
+int backport_genlmsg_multicast_allns(const struct genl_family *family,
+ struct sk_buff *skb, u32 portid,
+ unsigned int group);
+#endif /* LINUX_VERSION_IN_RANGE(5,15,0,5,15,169) ||
+ LINUX_VERSION_IN_RANGE(6,1,0,6,1,115) ||
+ LINUX_VERSION_IN_RANGE(6,6,0,6,6,58) */
+
#endif /* __BACKPORT_NET_GENETLINK_H */
--- a/compat/Makefile
+++ b/compat/Makefile
@@ -16,7 +16,8 @@ compat-$(CPTCFG_KERNEL_5_9) += backport-
compat-$(CPTCFG_KERNEL_5_10) += backport-5.10.o
compat-$(CPTCFG_KERNEL_5_11) += backport-5.11.o
compat-$(CPTCFG_KERNEL_5_13) += backport-5.13.o
-compat-$(CPTCFG_KERNEL_5_15) += backport-5.15.o
+compat-$(CPTCFG_KERNEL_5_15) += backport-5.15.o backport-genetlink.o
+compat-$(CPTCFG_KERNEL_6_1) += backport-genetlink.o
compat-$(CPTCFG_KERNEL_6_4) += backport-6.4.o
compat-$(CPTCFG_BPAUTO_BUILD_CRYPTO_LIB_ARC4) += lib-crypto-arc4.o
--- a/compat/backport-genetlink.c
+++ b/compat/backport-genetlink.c
@@ -17,6 +17,7 @@
#include <net/netlink.h>
#include <net/sock.h>
+#if LINUX_VERSION_IS_LESS(5,2,0)
static const struct genl_family *find_family_real_ops(const struct genl_ops **ops)
{
const struct genl_family *family;
@@ -249,3 +250,63 @@ int backport_genlmsg_multicast_allns(con
return genlmsg_mcast(skb, portid, group);
}
EXPORT_SYMBOL_GPL(backport_genlmsg_multicast_allns);
+#endif /* LINUX_VERSION_IS_LESS(5,2,0) */
+
+#if LINUX_VERSION_IN_RANGE(5,15,0,5,15,169) || \
+ LINUX_VERSION_IN_RANGE(6,1,0,6,1,115) || \
+ LINUX_VERSION_IN_RANGE(6,6,0,6,6,58)
+static int genlmsg_mcast(struct sk_buff *skb, u32 portid, unsigned long group)
+{
+ struct sk_buff *tmp;
+ struct net *net, *prev = NULL;
+ bool delivered = false;
+ int err;
+
+ rcu_read_lock();
+ for_each_net_rcu(net) {
+ if (prev) {
+ tmp = skb_clone(skb, GFP_ATOMIC);
+ if (!tmp) {
+ err = -ENOMEM;
+ goto error;
+ }
+ err = nlmsg_multicast(prev->genl_sock, tmp,
+ portid, group, GFP_ATOMIC);
+ if (!err)
+ delivered = true;
+ else if (err != -ESRCH)
+ goto error;
+ }
+
+ prev = net;
+ }
+ err = nlmsg_multicast(prev->genl_sock, skb, portid, group, GFP_ATOMIC);
+
+ rcu_read_unlock();
+
+ if (!err)
+ delivered = true;
+ else if (err != -ESRCH)
+ return err;
+ return delivered ? 0 : -ESRCH;
+ error:
+ rcu_read_unlock();
+
+ kfree_skb(skb);
+ return err;
+}
+
+int backport_genlmsg_multicast_allns(const struct genl_family *family,
+ struct sk_buff *skb, u32 portid,
+ unsigned int group)
+{
+ if (WARN_ON_ONCE(group >= family->n_mcgrps))
+ return -EINVAL;
+
+ group = family->mcgrp_offset + group;
+ return genlmsg_mcast(skb, portid, group);
+}
+EXPORT_SYMBOL_GPL(backport_genlmsg_multicast_allns);
+#endif /* LINUX_VERSION_IN_RANGE(5,15,0,5,15,169) ||
+ LINUX_VERSION_IN_RANGE(6,1,0,6,1,115) ||
+ LINUX_VERSION_IN_RANGE(6,6,0,6,6,58) */