This patch adds masquerade support to nft_nat.
Note that enum nf_nat_manip_type is replaced by enum nft_nat_types in order
to support masquerade.
Signed-off-by: Arturo Borrero Gonzalez <arturo.borrero.glez@xxxxxxxxx>
---
v2: fix missing htonl() conversion for NFTA_NAT_TYPE in _ipv6_dump().
v3: no changes.
include/net/netfilter/nft_nat.h | 2 +-
include/uapi/linux/netfilter/nf_tables.h | 8 ++++--
net/ipv4/netfilter/nft_nat_ipv4.c | 40 ++++++++++++++++++++++++++++--
net/ipv6/netfilter/nft_nat_ipv6.c | 39 +++++++++++++++++++++++++++--
net/netfilter/nft_nat.c | 20 ++++-----------
5 files changed, 84 insertions(+), 25 deletions(-)
diff --git a/include/net/netfilter/nft_nat.h b/include/net/netfilter/nft_nat.h
index 0ac1546..f5e108c 100644
--- a/include/net/netfilter/nft_nat.h
+++ b/include/net/netfilter/nft_nat.h
@@ -6,7 +6,7 @@ struct nft_nat {
enum nft_registers sreg_addr_max:8;
enum nft_registers sreg_proto_min:8;
enum nft_registers sreg_proto_max:8;
- enum nf_nat_manip_type type:8;
+ enum nft_nat_types type:8;
u8 family;
u16 flags;
};
diff --git a/include/uapi/linux/netfilter/nf_tables.h b/include/uapi/linux/netfilter/nf_tables.h
index 92c211b..ce75cb7 100644
--- a/include/uapi/linux/netfilter/nf_tables.h
+++ b/include/uapi/linux/netfilter/nf_tables.h
@@ -754,14 +754,16 @@ enum nft_reject_attributes {
#define NFTA_REJECT_MAX (__NFTA_REJECT_MAX - 1)
/**
- * enum nft_nat_types - nf_tables nat expression NAT types
+ * enum nft_nat_types - nf_tables nat expression NAT types.
*
* @NFT_NAT_SNAT: source NAT
* @NFT_NAT_DNAT: destination NAT
+ * @NFT_NAT_MASQUERADE: masquerade NAT
*/
enum nft_nat_types {
- NFT_NAT_SNAT,
- NFT_NAT_DNAT,
+ NFT_NAT_SNAT, /* NF_NAT_MANIP_SRC */
+ NFT_NAT_DNAT, /* NF_NAT_MANIP_DST */
+ NFT_NAT_MASQUERADE,
};
/**
diff --git a/net/ipv4/netfilter/nft_nat_ipv4.c b/net/ipv4/netfilter/nft_nat_ipv4.c
index eea3cd9..d246eb3 100644
--- a/net/ipv4/netfilter/nft_nat_ipv4.c
+++ b/net/ipv4/netfilter/nft_nat_ipv4.c
@@ -37,6 +37,7 @@ static void nft_nat_ipv4_eval(const struct nft_expr *expr,
enum ip_conntrack_info ctinfo;
struct nf_conn *ct = nf_ct_get(pkt->skb, &ctinfo);
struct nf_nat_range range;
+ unsigned int verdict;
memset(&range, 0, sizeof(range));
if (priv->sreg_addr_min) {
@@ -59,8 +60,40 @@ static void nft_nat_ipv4_eval(const struct nft_expr *expr,
range.flags |= priv->flags;
- data[NFT_REG_VERDICT].verdict =
- nf_nat_setup_info(ct, &range, priv->type);
+ if (priv->type == NFT_NAT_MASQUERADE) {
+ verdict = nf_nat_masquerade_ipv4(pkt->skb, pkt->ops->hooknum,
+ &range, pkt->out);
+ } else {
+ verdict = nf_nat_setup_info(ct, &range, priv->type);
+ }
+
+ data[NFT_REG_VERDICT].verdict = verdict;
+}
+
+static int nft_nat_ipv4_init(const struct nft_ctx *ctx,
+ const struct nft_expr *expr,
+ const struct nlattr * const tb[])
+{
+ int ret;
+ struct nft_nat *priv = nft_expr_priv(expr);
+
+ ret = nft_nat_init(ctx, expr, tb);
+ if (ret < 0)
+ goto out;
+
+ if (priv->type == NFT_NAT_MASQUERADE)
+ nf_nat_masquerade_ipv4_register_notifier();
+out:
+ return ret;
+}
+
+static void nft_nat_ipv4_destroy(const struct nft_ctx *ctx,
+ const struct nft_expr *expr)
+{
+ struct nft_nat *priv = nft_expr_priv(expr);
+
+ if (priv->type == NFT_NAT_MASQUERADE)
+ nf_nat_masquerade_ipv4_unregister_notifier();
}
static struct nft_expr_type nft_nat_ipv4_type;
@@ -68,7 +101,8 @@ static const struct nft_expr_ops nft_nat_ipv4_ops = {
.type = &nft_nat_ipv4_type,
.size = NFT_EXPR_SIZE(sizeof(struct nft_nat)),
.eval = nft_nat_ipv4_eval,
- .init = nft_nat_init,
+ .init = nft_nat_ipv4_init,
+ .destroy = nft_nat_ipv4_destroy,
.dump = nft_nat_dump,
};
diff --git a/net/ipv6/netfilter/nft_nat_ipv6.c b/net/ipv6/netfilter/nft_nat_ipv6.c
index bf1498a..0e4f277 100644
--- a/net/ipv6/netfilter/nft_nat_ipv6.c
+++ b/net/ipv6/netfilter/nft_nat_ipv6.c
@@ -27,6 +27,7 @@
#include <net/netfilter/nf_nat_l3proto.h>
#include <net/ip.h>
#include <net/netfilter/nft_nat.h>
+#include <net/netfilter/ipv6/nf_nat_masquerade_ipv6.h>
static void nft_nat_ipv6_eval(const struct nft_expr *expr,
struct nft_data data[NFT_REG_MAX + 1],
@@ -36,6 +37,7 @@ static void nft_nat_ipv6_eval(const struct nft_expr *expr,
enum ip_conntrack_info ctinfo;
struct nf_conn *ct = nf_ct_get(pkt->skb, &ctinfo);
struct nf_nat_range range;
+ unsigned int verdict;
memset(&range, 0, sizeof(range));
if (priv->sreg_addr_min) {
@@ -59,8 +61,38 @@ static void nft_nat_ipv6_eval(const struct nft_expr *expr,
range.flags |= priv->flags;
- data[NFT_REG_VERDICT].verdict =
- nf_nat_setup_info(ct, &range, priv->type);
+ if (priv->type == NFT_NAT_MASQUERADE)
+ verdict = nf_nat_masquerade_ipv6(pkt->skb, &range, pkt->out);
+ else
+ verdict = nf_nat_setup_info(ct, &range, priv->type);
+
+ data[NFT_REG_VERDICT].verdict = verdict;
+}
+
+static int nft_nat_ipv6_init(const struct nft_ctx *ctx,
+ const struct nft_expr *expr,
+ const struct nlattr * const tb[])
+{
+ int ret;
+ struct nft_nat *priv = nft_expr_priv(expr);
+
+ ret = nft_nat_init(ctx, expr, tb);
+ if (ret < 0)
+ goto out;
+
+ if (priv->type == NFT_NAT_MASQUERADE)
+ nf_nat_masquerade_ipv6_register_notifier();
+out:
+ return ret;
+}
+
+static void nft_nat_ipv6_destroy(const struct nft_ctx *ctx,
+ const struct nft_expr *expr)
+{
+ struct nft_nat *priv = nft_expr_priv(expr);
+
+ if (priv->type == NFT_NAT_MASQUERADE)
+ nf_nat_masquerade_ipv6_unregister_notifier();
}
static struct nft_expr_type nft_nat_ipv6_type;
@@ -68,7 +100,8 @@ static const struct nft_expr_ops nft_nat_ipv6_ops = {
.type = &nft_nat_ipv6_type,
.size = NFT_EXPR_SIZE(sizeof(struct nft_nat)),
.eval = nft_nat_ipv6_eval,
- .init = nft_nat_init,
+ .init = nft_nat_ipv6_init,
+ .destroy = nft_nat_ipv6_destroy,
.dump = nft_nat_dump,
};
diff --git a/net/netfilter/nft_nat.c b/net/netfilter/nft_nat.c
index ec9c283..d603acb 100644
--- a/net/netfilter/nft_nat.c
+++ b/net/netfilter/nft_nat.c
@@ -49,12 +49,11 @@ int nft_nat_init(const struct nft_ctx *ctx, const struct nft_expr *expr,
if (tb[NFTA_NAT_TYPE] == NULL)
return -EINVAL;
- switch (ntohl(nla_get_be32(tb[NFTA_NAT_TYPE]))) {
+ priv->type = ntohl(nla_get_be32(tb[NFTA_NAT_TYPE]));
+ switch (priv->type) {
case NFT_NAT_SNAT:
- priv->type = NF_NAT_MANIP_SRC;
- break;
case NFT_NAT_DNAT:
- priv->type = NF_NAT_MANIP_DST;
+ case NFT_NAT_MASQUERADE:
break;
default:
return -EINVAL;
@@ -122,17 +121,8 @@ int nft_nat_dump(struct sk_buff *skb, const struct nft_expr *expr)
{
const struct nft_nat *priv = nft_expr_priv(expr);
- switch (priv->type) {
- case NF_NAT_MANIP_SRC:
- if (nla_put_be32(skb, NFTA_NAT_TYPE, htonl(NFT_NAT_SNAT)))
- goto nla_put_failure;
- break;
- case NF_NAT_MANIP_DST:
- if (nla_put_be32(skb, NFTA_NAT_TYPE, htonl(NFT_NAT_DNAT)))
- goto nla_put_failure;
- break;
- }
-
+ if (nla_put_be32(skb, NFTA_NAT_TYPE, htonl(priv->type)))
+ goto nla_put_failure;
if (nla_put_be32(skb, NFTA_NAT_FAMILY, htonl(priv->family)))
goto nla_put_failure;
if (nla_put_be32(skb,
--
To unsubscribe from this list: send the line "unsubscribe netfilter-devel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
