netdev - [PATCH 10/22] netfilter: nft

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Date:   Mon, 15 Apr 2019 19:00:16 +0200
From:   Pablo Neira Ayuso <pablo@...filter.org>
To:     netfilter-devel@...r.kernel.org
Cc:     davem@...emloft.net, netdev@...r.kernel.org
Subject: [PATCH 10/22] netfilter: nft_masq: add inet support

From: Florian Westphal <fw@...len.de>

This allows use of a single masquerade rule in nat inet family
to handle both ipv4 and ipv6.

Signed-off-by: Florian Westphal <fw@...len.de>
Signed-off-by: Pablo Neira Ayuso <pablo@...filter.org>
---
 net/netfilter/nft_masq.c | 64 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 64 insertions(+)

diff --git a/net/netfilter/nft_masq.c b/net/netfilter/nft_masq.c
index bee156eaa400..35a1794acf4c 100644
--- a/net/netfilter/nft_masq.c
+++ b/net/netfilter/nft_masq.c
@@ -218,6 +218,61 @@ static inline int nft_masq_module_init_ipv6(void) { return 0; }
 static inline void nft_masq_module_exit_ipv6(void) {}
 #endif
 
+#ifdef CONFIG_NF_TABLES_INET
+static void nft_masq_inet_eval(const struct nft_expr *expr,
+			       struct nft_regs *regs,
+			       const struct nft_pktinfo *pkt)
+{
+	switch (nft_pf(pkt)) {
+	case NFPROTO_IPV4:
+		return nft_masq_ipv4_eval(expr, regs, pkt);
+	case NFPROTO_IPV6:
+		return nft_masq_ipv6_eval(expr, regs, pkt);
+	}
+
+	WARN_ON_ONCE(1);
+}
+
+static void
+nft_masq_inet_destroy(const struct nft_ctx *ctx, const struct nft_expr *expr)
+{
+	nf_ct_netns_put(ctx->net, NFPROTO_INET);
+}
+
+static struct nft_expr_type nft_masq_inet_type;
+static const struct nft_expr_ops nft_masq_inet_ops = {
+	.type		= &nft_masq_inet_type,
+	.size		= NFT_EXPR_SIZE(sizeof(struct nft_masq)),
+	.eval		= nft_masq_inet_eval,
+	.init		= nft_masq_init,
+	.destroy	= nft_masq_inet_destroy,
+	.dump		= nft_masq_dump,
+	.validate	= nft_masq_validate,
+};
+
+static struct nft_expr_type nft_masq_inet_type __read_mostly = {
+	.family		= NFPROTO_INET,
+	.name		= "masq",
+	.ops		= &nft_masq_inet_ops,
+	.policy		= nft_masq_policy,
+	.maxattr	= NFTA_MASQ_MAX,
+	.owner		= THIS_MODULE,
+};
+
+static int __init nft_masq_module_init_inet(void)
+{
+	return nft_register_expr(&nft_masq_inet_type);
+}
+
+static void nft_masq_module_exit_inet(void)
+{
+	nft_unregister_expr(&nft_masq_inet_type);
+}
+#else
+static inline int nft_masq_module_init_inet(void) { return 0; }
+static inline void nft_masq_module_exit_inet(void) {}
+#endif
+
 static int __init nft_masq_module_init(void)
 {
 	int ret;
@@ -226,8 +281,15 @@ static int __init nft_masq_module_init(void)
 	if (ret < 0)
 		return ret;
 
+	ret = nft_masq_module_init_inet();
+	if (ret < 0) {
+		nft_masq_module_exit_ipv6();
+		return ret;
+	}
+
 	ret = nft_register_expr(&nft_masq_ipv4_type);
 	if (ret < 0) {
+		nft_masq_module_exit_inet();
 		nft_masq_module_exit_ipv6();
 		return ret;
 	}
@@ -235,6 +297,7 @@ static int __init nft_masq_module_init(void)
 	ret = nf_nat_masquerade_ipv4_register_notifier();
 	if (ret < 0) {
 		nft_masq_module_exit_ipv6();
+		nft_masq_module_exit_inet();
 		nft_unregister_expr(&nft_masq_ipv4_type);
 		return ret;
 	}
@@ -245,6 +308,7 @@ static int __init nft_masq_module_init(void)
 static void __exit nft_masq_module_exit(void)
 {
 	nft_masq_module_exit_ipv6();
+	nft_masq_module_exit_inet();
 	nft_unregister_expr(&nft_masq_ipv4_type);
 	nf_nat_masquerade_ipv4_unregister_notifier();
 }
-- 
2.11.0