From 90e279db0cf55aeec710dbc5ae610f66a9ba3f70 Mon Sep 17 00:00:00 2001
From: Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
Date: Mon, 10 Nov 2014 19:20:29 +0100
Subject: Add more compatibility checkings to support older kernel releases

---
 configure.ac                                       | 29 +++++++++++++++++++---
 .../linux/netfilter/ipset/ip_set_compat.h.in       |  4 ++-
 kernel/net/netfilter/xt_set.c                      |  5 +++-
 3 files changed, 32 insertions(+), 6 deletions(-)

diff --git a/configure.ac b/configure.ac
index 8e5c270..985d592 100644
--- a/configure.ac
+++ b/configure.ac
@@ -200,6 +200,16 @@ else
 	AC_SUBST(HAVE_ETHER_ADDR_EQUAL, undef)
 fi
 
+AC_MSG_CHECKING([kernel source for nla_put_be16])
+if test -f $ksourcedir/include/net/netlink.h && \
+   $GREP -q 'nla_put_be16' $ksourcedir/include/net/netlink.h; then
+	AC_MSG_RESULT(yes)
+	AC_SUBST(HAVE_NLA_PUT_BE16, define)
+else
+	AC_MSG_RESULT(no)
+	AC_SUBST(HAVE_NLA_PUT_BE16, undef)
+fi
+
 AC_MSG_CHECKING([kernel source for nla_put_be64])
 if test -f $ksourcedir/include/net/netlink.h && \
    $GREP -q 'nla_put_be64' $ksourcedir/include/net/netlink.h; then
@@ -274,8 +284,8 @@ else
 fi
 
 AC_MSG_CHECKING([kernel source for bool checkentry function prototype])
-if test -f $ksourcedir/net/netfilter/xt_state.c && \
-   $GREP -q 'bool state_mt_check' $ksourcedir/net/netfilter/xt_state.c; then
+if test -f $ksourcedir/include/linux/netfilter/x_tables.h && \
+   $GREP -q 'bool .\*checkentry.' $ksourcedir/include/linux/netfilter/x_tables.h; then
 	AC_MSG_RESULT(yes)
 	AC_SUBST(HAVE_CHECKENTRY_BOOL, define)
 else
@@ -284,8 +294,8 @@ else
 fi
 
 AC_MSG_CHECKING([kernel source for old struct xt_target_param])
-if test -f $ksourcedir/net/netfilter/xt_TCPMSS.c && \
-   $GREP -q 'const struct xt_target_param' $ksourcedir/net/netfilter/xt_TCPMSS.c; then
+if test -f $ksourcedir/include/linux/netfilter/x_tables.h && \
+   $GREP -q '^struct xt_target_param ' $ksourcedir/include/linux/netfilter/x_tables.h; then
 	AC_MSG_RESULT(yes)
 	AC_SUBST(HAVE_XT_TARGET_PARAM, define)
 else
@@ -333,6 +343,17 @@ else
 	AC_SUBST(HAVE_KVFREE, undef)
 fi
 
+AC_MSG_CHECKING([kernel source for struct net in struct xt_mtchk_param])
+if test -f $ksourcedir/include/linux/netfilter/x_tables.h && \
+   $AWK '/^struct xt_mtchk_param / {for(i=1; i<=5; i++) {getline; print}}' $ksourcedir/include/linux/netfilter/x_tables.h | \
+   $GREP -q 'struct net '; then
+	AC_MSG_RESULT(yes)
+	AC_SUBST(HAVE_XT_MTCHK_PARAM_STRUCT_NET, define)
+else
+	AC_MSG_RESULT(no)
+	AC_SUBST(HAVE_XT_MTCHK_PARAM_STRUCT_NET, undef)
+fi
+
 AC_MSG_CHECKING([kernel source for struct net in the change function of tcf_ematch_ops])
 if test -f $ksourcedir/include/net/pkt_cls.h && \
    $AWK '/^struct tcf_ematch_ops / {for(i=1; i<=5; i++) {getline; print}}' $ksourcedir/include/net/pkt_cls.h | \
diff --git a/kernel/include/linux/netfilter/ipset/ip_set_compat.h.in b/kernel/include/linux/netfilter/ipset/ip_set_compat.h.in
index 9809e2a..862504b 100644
--- a/kernel/include/linux/netfilter/ipset/ip_set_compat.h.in
+++ b/kernel/include/linux/netfilter/ipset/ip_set_compat.h.in
@@ -23,6 +23,7 @@
 #@HAVE_STRUCT_XT_ACTION_PARAM@ HAVE_STRUCT_XT_ACTION_PARAM
 #@HAVE_VZALLOC@ HAVE_VZALLOC
 #@HAVE_ETHER_ADDR_EQUAL@ HAVE_ETHER_ADDR_EQUAL
+#@HAVE_NLA_PUT_BE16@ HAVE_NLA_PUT_BE16
 #@HAVE_NLA_PUT_BE64@ HAVE_NLA_PUT_BE64
 #@HAVE_NL_INFO_PORTID@ HAVE_NL_INFO_PORTID
 #define HAVE_NETLINK_DUMP_START_ARGS	@HAVE_NETLINK_DUMP_START_ARGS@
@@ -36,6 +37,7 @@
 #@HAVE_USER_NS_IN_STRUCT_NET@ HAVE_USER_NS_IN_STRUCT_NET
 #@HAVE_RBTREE_POSTORDER_FOR_EACH_ENTRY_SAFE@ HAVE_RBTREE_POSTORDER_FOR_EACH_ENTRY_SAFE
 #@HAVE_KVFREE@ HAVE_KVFREE
+#@HAVE_XT_MTCHK_PARAM_STRUCT_NET@ HAVE_XT_MTCHK_PARAM_STRUCT_NET
 #@HAVE_TCF_EMATCH_OPS_CHANGE_ARG_NET@ HAVE_TCF_EMATCH_OPS_CHANGE_ARG_NET
 #@HAVE_TCF_EMATCH_STRUCT_NET@ HAVE_TCF_EMATCH_STRUCT_NET
 
@@ -128,7 +130,7 @@ static inline void kvfree(const void *addr)
 }
 #endif
 
-#ifdef NLA_PUT_NET16
+#ifndef HAVE_NLA_PUT_BE16
 static inline int nla_put_be16(struct sk_buff *skb, int attrtype, __be16 value)
 {
 	return nla_put(skb, attrtype, sizeof(__be16), &value);
diff --git a/kernel/net/netfilter/xt_set.c b/kernel/net/netfilter/xt_set.c
index 7be5c34..39eee43 100644
--- a/kernel/net/netfilter/xt_set.c
+++ b/kernel/net/netfilter/xt_set.c
@@ -33,13 +33,16 @@ MODULE_ALIAS("ip6t_SET");
 #define CHECK_FAIL(err)	0
 #define	CONST		const
 #define FTYPE		bool
-#define	XT_PAR_NET(par)	NULL
 #else /* LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,35) */
 #define CHECK_OK	0
 #define CHECK_FAIL(err)	(err)
 #define	CONST
 #define	FTYPE		int
+#endif
+#ifdef HAVE_XT_MTCHK_PARAM_STRUCT_NET
 #define XT_PAR_NET(par)	(par)->net
+#else
+#define	XT_PAR_NET(par)	NULL
 #endif
 
 static inline int
-- 
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