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authorFlorian Westphal <fw@strlen.de>2019-02-28 12:02:51 +0100
committerPablo Neira Ayuso <pablo@netfilter.org>2019-03-01 14:36:59 +0100
commita9ce849e786787af4b7dffd48d49b97b04671f8c (patch)
tree9743b6682edcb76818463eca7d385251bf8a35a1 /net/netfilter
parentc78efc99c75089efd3df2ebd3bd279b52b4ab125 (diff)
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netfilter: nf_tables: nat: merge nft_masq protocol specific modules
The family specific masq modules are way too small to warrant an extra module, just place all of them in nft_masq. before: text data bss dec hex filename 1001 832 0 1833 729 nft_masq.ko 766 896 0 1662 67e nft_masq_ipv4.ko 764 896 0 1660 67c nft_masq_ipv6.ko after: 2010 960 0 2970 b9a nft_masq.ko Signed-off-by: Florian Westphal <fw@strlen.de> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Diffstat (limited to 'net/netfilter')
-rw-r--r--net/netfilter/Kconfig1
-rw-r--r--net/netfilter/nft_masq.c180
2 files changed, 168 insertions, 13 deletions
diff --git a/net/netfilter/Kconfig b/net/netfilter/Kconfig
index 73857f9fdb25..537f23a8ed52 100644
--- a/net/netfilter/Kconfig
+++ b/net/netfilter/Kconfig
@@ -532,6 +532,7 @@ config NFT_LIMIT
config NFT_MASQ
depends on NF_CONNTRACK
depends on NF_NAT
+ select NF_NAT_MASQUERADE
tristate "Netfilter nf_tables masquerade support"
help
This option adds the "masquerade" expression that you can use
diff --git a/net/netfilter/nft_masq.c b/net/netfilter/nft_masq.c
index 9d8655bc1bea..bee156eaa400 100644
--- a/net/netfilter/nft_masq.c
+++ b/net/netfilter/nft_masq.c
@@ -14,18 +14,24 @@
#include <linux/netfilter/nf_tables.h>
#include <net/netfilter/nf_tables.h>
#include <net/netfilter/nf_nat.h>
-#include <net/netfilter/nft_masq.h>
+#include <net/netfilter/ipv4/nf_nat_masquerade.h>
+#include <net/netfilter/ipv6/nf_nat_masquerade.h>
-const struct nla_policy nft_masq_policy[NFTA_MASQ_MAX + 1] = {
+struct nft_masq {
+ u32 flags;
+ enum nft_registers sreg_proto_min:8;
+ enum nft_registers sreg_proto_max:8;
+};
+
+static const struct nla_policy nft_masq_policy[NFTA_MASQ_MAX + 1] = {
[NFTA_MASQ_FLAGS] = { .type = NLA_U32 },
[NFTA_MASQ_REG_PROTO_MIN] = { .type = NLA_U32 },
[NFTA_MASQ_REG_PROTO_MAX] = { .type = NLA_U32 },
};
-EXPORT_SYMBOL_GPL(nft_masq_policy);
-int nft_masq_validate(const struct nft_ctx *ctx,
- const struct nft_expr *expr,
- const struct nft_data **data)
+static int nft_masq_validate(const struct nft_ctx *ctx,
+ const struct nft_expr *expr,
+ const struct nft_data **data)
{
int err;
@@ -36,11 +42,10 @@ int nft_masq_validate(const struct nft_ctx *ctx,
return nft_chain_validate_hooks(ctx->chain,
(1 << NF_INET_POST_ROUTING));
}
-EXPORT_SYMBOL_GPL(nft_masq_validate);
-int nft_masq_init(const struct nft_ctx *ctx,
- const struct nft_expr *expr,
- const struct nlattr * const tb[])
+static int nft_masq_init(const struct nft_ctx *ctx,
+ const struct nft_expr *expr,
+ const struct nlattr * const tb[])
{
u32 plen = FIELD_SIZEOF(struct nf_nat_range, min_addr.all);
struct nft_masq *priv = nft_expr_priv(expr);
@@ -75,9 +80,8 @@ int nft_masq_init(const struct nft_ctx *ctx,
return nf_ct_netns_get(ctx->net, ctx->family);
}
-EXPORT_SYMBOL_GPL(nft_masq_init);
-int nft_masq_dump(struct sk_buff *skb, const struct nft_expr *expr)
+static int nft_masq_dump(struct sk_buff *skb, const struct nft_expr *expr)
{
const struct nft_masq *priv = nft_expr_priv(expr);
@@ -98,7 +102,157 @@ int nft_masq_dump(struct sk_buff *skb, const struct nft_expr *expr)
nla_put_failure:
return -1;
}
-EXPORT_SYMBOL_GPL(nft_masq_dump);
+
+static void nft_masq_ipv4_eval(const struct nft_expr *expr,
+ struct nft_regs *regs,
+ const struct nft_pktinfo *pkt)
+{
+ struct nft_masq *priv = nft_expr_priv(expr);
+ struct nf_nat_range2 range;
+
+ memset(&range, 0, sizeof(range));
+ range.flags = priv->flags;
+ if (priv->sreg_proto_min) {
+ range.min_proto.all = (__force __be16)nft_reg_load16(
+ &regs->data[priv->sreg_proto_min]);
+ range.max_proto.all = (__force __be16)nft_reg_load16(
+ &regs->data[priv->sreg_proto_max]);
+ }
+ regs->verdict.code = nf_nat_masquerade_ipv4(pkt->skb, nft_hook(pkt),
+ &range, nft_out(pkt));
+}
+
+static void
+nft_masq_ipv4_destroy(const struct nft_ctx *ctx, const struct nft_expr *expr)
+{
+ nf_ct_netns_put(ctx->net, NFPROTO_IPV4);
+}
+
+static struct nft_expr_type nft_masq_ipv4_type;
+static const struct nft_expr_ops nft_masq_ipv4_ops = {
+ .type = &nft_masq_ipv4_type,
+ .size = NFT_EXPR_SIZE(sizeof(struct nft_masq)),
+ .eval = nft_masq_ipv4_eval,
+ .init = nft_masq_init,
+ .destroy = nft_masq_ipv4_destroy,
+ .dump = nft_masq_dump,
+ .validate = nft_masq_validate,
+};
+
+static struct nft_expr_type nft_masq_ipv4_type __read_mostly = {
+ .family = NFPROTO_IPV4,
+ .name = "masq",
+ .ops = &nft_masq_ipv4_ops,
+ .policy = nft_masq_policy,
+ .maxattr = NFTA_MASQ_MAX,
+ .owner = THIS_MODULE,
+};
+
+#ifdef CONFIG_NF_TABLES_IPV6
+static void nft_masq_ipv6_eval(const struct nft_expr *expr,
+ struct nft_regs *regs,
+ const struct nft_pktinfo *pkt)
+{
+ struct nft_masq *priv = nft_expr_priv(expr);
+ struct nf_nat_range2 range;
+
+ memset(&range, 0, sizeof(range));
+ range.flags = priv->flags;
+ if (priv->sreg_proto_min) {
+ range.min_proto.all = (__force __be16)nft_reg_load16(
+ &regs->data[priv->sreg_proto_min]);
+ range.max_proto.all = (__force __be16)nft_reg_load16(
+ &regs->data[priv->sreg_proto_max]);
+ }
+ regs->verdict.code = nf_nat_masquerade_ipv6(pkt->skb, &range,
+ nft_out(pkt));
+}
+
+static void
+nft_masq_ipv6_destroy(const struct nft_ctx *ctx, const struct nft_expr *expr)
+{
+ nf_ct_netns_put(ctx->net, NFPROTO_IPV6);
+}
+
+static struct nft_expr_type nft_masq_ipv6_type;
+static const struct nft_expr_ops nft_masq_ipv6_ops = {
+ .type = &nft_masq_ipv6_type,
+ .size = NFT_EXPR_SIZE(sizeof(struct nft_masq)),
+ .eval = nft_masq_ipv6_eval,
+ .init = nft_masq_init,
+ .destroy = nft_masq_ipv6_destroy,
+ .dump = nft_masq_dump,
+ .validate = nft_masq_validate,
+};
+
+static struct nft_expr_type nft_masq_ipv6_type __read_mostly = {
+ .family = NFPROTO_IPV6,
+ .name = "masq",
+ .ops = &nft_masq_ipv6_ops,
+ .policy = nft_masq_policy,
+ .maxattr = NFTA_MASQ_MAX,
+ .owner = THIS_MODULE,
+};
+
+static int __init nft_masq_module_init_ipv6(void)
+{
+ int ret = nft_register_expr(&nft_masq_ipv6_type);
+
+ if (ret)
+ return ret;
+
+ ret = nf_nat_masquerade_ipv6_register_notifier();
+ if (ret < 0)
+ nft_unregister_expr(&nft_masq_ipv6_type);
+
+ return ret;
+}
+
+static void nft_masq_module_exit_ipv6(void)
+{
+ nft_unregister_expr(&nft_masq_ipv6_type);
+ nf_nat_masquerade_ipv6_unregister_notifier();
+}
+#else
+static inline int nft_masq_module_init_ipv6(void) { return 0; }
+static inline void nft_masq_module_exit_ipv6(void) {}
+#endif
+
+static int __init nft_masq_module_init(void)
+{
+ int ret;
+
+ ret = nft_masq_module_init_ipv6();
+ if (ret < 0)
+ return ret;
+
+ ret = nft_register_expr(&nft_masq_ipv4_type);
+ if (ret < 0) {
+ nft_masq_module_exit_ipv6();
+ return ret;
+ }
+
+ ret = nf_nat_masquerade_ipv4_register_notifier();
+ if (ret < 0) {
+ nft_masq_module_exit_ipv6();
+ nft_unregister_expr(&nft_masq_ipv4_type);
+ return ret;
+ }
+
+ return ret;
+}
+
+static void __exit nft_masq_module_exit(void)
+{
+ nft_masq_module_exit_ipv6();
+ nft_unregister_expr(&nft_masq_ipv4_type);
+ nf_nat_masquerade_ipv4_unregister_notifier();
+}
+
+module_init(nft_masq_module_init);
+module_exit(nft_masq_module_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Arturo Borrero Gonzalez <arturo@debian.org>");
+MODULE_ALIAS_NFT_AF_EXPR(AF_INET6, "masq");
+MODULE_ALIAS_NFT_AF_EXPR(AF_INET, "masq");