Merge git://git.kernel.org/pub/scm/linux/kernel/git/pablo/nf-next

Pablo Neira Ayuso says:

====================
Netfilter/IPVS updates for net-next

The following patchset contains Netfilter/IPVS updates for net-next:

1) Move bridge keys in nft_meta to nft_meta_bridge, from wenxu.

2) Support for bridge pvid matching, from wenxu.

3) Support for bridge vlan protocol matching, also from wenxu.

4) Add br_vlan_get_pvid_rcu(), to fetch the bridge port pvid
   from packet path.

5) Prefer specific family extension in nf_tables.

6) Autoload specific family extension in case it is missing.

7) Add synproxy support to nf_tables, from Fernando Fernandez Mancera.

8) Support for GRE encapsulation in IPVS, from Vadim Fedorenko.

9) ICMP handling for GRE encapsulation, from Julian Anastasov.

10) Remove unused parameter in nf_queue, from Florian Westphal.

11) Replace seq_printf() by seq_puts() in nf_log, from Markus Elfring.

12) Rename nf_SYNPROXY.h => nf_synproxy.h before this header becomes
    public.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>

include/linux/if_bridge.h

@@ -88,6 +88,8 @@ static inline bool br_multicast_router(const struct net_device *dev)
 #if IS_ENABLED(CONFIG_BRIDGE) && IS_ENABLED(CONFIG_BRIDGE_VLAN_FILTERING)
 bool br_vlan_enabled(const struct net_device *dev);
 int br_vlan_get_pvid(const struct net_device *dev, u16 *p_pvid);
+int br_vlan_get_pvid_rcu(const struct net_device *dev, u16 *p_pvid);
+int br_vlan_get_proto(const struct net_device *dev, u16 *p_proto);
 int br_vlan_get_info(const struct net_device *dev, u16 vid,
 		     struct bridge_vlan_info *p_vinfo);
 #else
@@ -101,6 +103,16 @@ static inline int br_vlan_get_pvid(const struct net_device *dev, u16 *p_pvid)
 	return -EINVAL;
 }
 
+static inline int br_vlan_get_proto(const struct net_device *dev, u16 *p_proto)
+{
+	return -EINVAL;
+}
+
+static inline int br_vlan_get_pvid_rcu(const struct net_device *dev, u16 *p_pvid)
+{
+	return -EINVAL;
+}
+
 static inline int br_vlan_get_info(const struct net_device *dev, u16 vid,
 				   struct bridge_vlan_info *p_vinfo)
 {

include/net/netfilter/nf_conntrack_synproxy.h

@@ -2,6 +2,7 @@
 #ifndef _NF_CONNTRACK_SYNPROXY_H
 #define _NF_CONNTRACK_SYNPROXY_H
 
+#include <net/netfilter/nf_conntrack_seqadj.h>
 #include <net/netns/generic.h>
 
 struct nf_conn_synproxy {

include/net/netfilter/nf_queue.h

@@ -120,6 +120,5 @@ nfqueue_hash(const struct sk_buff *skb, u16 queue, u16 queues_total, u8 family,
 }
 
 int nf_queue(struct sk_buff *skb, struct nf_hook_state *state,
-	     const struct nf_hook_entries *entries, unsigned int index,
-	     unsigned int verdict);
+	     unsigned int index, unsigned int verdict);
 #endif /* _NF_QUEUE_H */

include/net/netfilter/nf_synproxy.h

@@ -39,6 +39,11 @@ unsigned int ipv6_synproxy_hook(void *priv, struct sk_buff *skb,
 				const struct nf_hook_state *nhs);
 int nf_synproxy_ipv6_init(struct synproxy_net *snet, struct net *net);
 void nf_synproxy_ipv6_fini(struct synproxy_net *snet, struct net *net);
+#else
+static inline int
+nf_synproxy_ipv6_init(struct synproxy_net *snet, struct net *net) { return 0; }
+static inline void
+nf_synproxy_ipv6_fini(struct synproxy_net *snet, struct net *net) {};
 #endif /* CONFIG_IPV6 */
 
 #endif /* _NF_SYNPROXY_SHARED_H */

include/net/netfilter/nft_meta.h

+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _NFT_META_H_
+#define _NFT_META_H_
+
+struct nft_meta {
+	enum nft_meta_keys	key:8;
+	union {
+		enum nft_registers	dreg:8;
+		enum nft_registers	sreg:8;
+	};
+};
+
+extern const struct nla_policy nft_meta_policy[];
+
+int nft_meta_get_init(const struct nft_ctx *ctx,
+		      const struct nft_expr *expr,
+		      const struct nlattr * const tb[]);
+
+int nft_meta_set_init(const struct nft_ctx *ctx,
+		      const struct nft_expr *expr,
+		      const struct nlattr * const tb[]);
+
+int nft_meta_get_dump(struct sk_buff *skb,
+		      const struct nft_expr *expr);
+
+int nft_meta_set_dump(struct sk_buff *skb,
+		      const struct nft_expr *expr);
+
+void nft_meta_get_eval(const struct nft_expr *expr,
+		       struct nft_regs *regs,
+		       const struct nft_pktinfo *pkt);
+
+void nft_meta_set_eval(const struct nft_expr *expr,
+		       struct nft_regs *regs,
+		       const struct nft_pktinfo *pkt);
+
+void nft_meta_set_destroy(const struct nft_ctx *ctx,
+			  const struct nft_expr *expr);
+
+int nft_meta_set_validate(const struct nft_ctx *ctx,
+			  const struct nft_expr *expr,
+			  const struct nft_data **data);
+
+#endif

include/uapi/linux/ip_vs.h

@@ -128,6 +128,7 @@
 enum {
 	IP_VS_CONN_F_TUNNEL_TYPE_IPIP = 0,	/* IPIP */
 	IP_VS_CONN_F_TUNNEL_TYPE_GUE,		/* GUE */
+	IP_VS_CONN_F_TUNNEL_TYPE_GRE,		/* GRE */
 	IP_VS_CONN_F_TUNNEL_TYPE_MAX,
 };
 

include/uapi/linux/netfilter/nf_SYNPROXY.h → include/uapi/linux/netfilter/nf_synproxy.h

@@ -9,6 +9,10 @@
 #define NF_SYNPROXY_OPT_SACK_PERM	0x04
 #define NF_SYNPROXY_OPT_TIMESTAMP	0x08
 #define NF_SYNPROXY_OPT_ECN		0x10
+#define NF_SYNPROXY_OPT_MASK		(NF_SYNPROXY_OPT_MSS | \
+					 NF_SYNPROXY_OPT_WSCALE | \
+					 NF_SYNPROXY_OPT_SACK_PERM | \
+					 NF_SYNPROXY_OPT_TIMESTAMP)
 
 struct nf_synproxy_info {
 	__u8	options;

include/uapi/linux/netfilter/nf_tables.h

@@ -795,6 +795,8 @@ enum nft_exthdr_attributes {
  * @NFT_META_SECPATH: boolean, secpath_exists (!!skb->sp)
  * @NFT_META_IIFKIND: packet input interface kind name (dev->rtnl_link_ops->kind)
  * @NFT_META_OIFKIND: packet output interface kind name (dev->rtnl_link_ops->kind)
+ * @NFT_META_BRI_IIFPVID: packet input bridge port pvid
+ * @NFT_META_BRI_IIFVPROTO: packet input bridge vlan proto
  */
 enum nft_meta_keys {
 	NFT_META_LEN,
@@ -825,6 +827,8 @@ enum nft_meta_keys {
 	NFT_META_SECPATH,
 	NFT_META_IIFKIND,
 	NFT_META_OIFKIND,
+	NFT_META_BRI_IIFPVID,
+	NFT_META_BRI_IIFVPROTO,
 };
 
 /**
@@ -1551,6 +1555,22 @@ enum nft_osf_flags {
 	NFT_OSF_F_VERSION = (1 << 0),
 };
 
+/**
+ * enum nft_synproxy_attributes - nf_tables synproxy expression netlink attributes
+ *
+ * @NFTA_SYNPROXY_MSS: mss value sent to the backend (NLA_U16)
+ * @NFTA_SYNPROXY_WSCALE: wscale value sent to the backend (NLA_U8)
+ * @NFTA_SYNPROXY_FLAGS: flags (NLA_U32)
+ */
+enum nft_synproxy_attributes {
+	NFTA_SYNPROXY_UNSPEC,
+	NFTA_SYNPROXY_MSS,
+	NFTA_SYNPROXY_WSCALE,
+	NFTA_SYNPROXY_FLAGS,
+	__NFTA_SYNPROXY_MAX,
+};
+#define NFTA_SYNPROXY_MAX (__NFTA_SYNPROXY_MAX - 1)
+
 /**
  * enum nft_device_attributes - nf_tables device netlink attributes
  *

include/uapi/linux/netfilter/xt_SYNPROXY.h

@@ -2,7 +2,7 @@
 #ifndef _XT_SYNPROXY_H
 #define _XT_SYNPROXY_H
 
-#include <linux/netfilter/nf_SYNPROXY.h>
+#include <linux/netfilter/nf_synproxy.h>
 
 #define XT_SYNPROXY_OPT_MSS		NF_SYNPROXY_OPT_MSS
 #define XT_SYNPROXY_OPT_WSCALE		NF_SYNPROXY_OPT_WSCALE

net/bridge/br_input.c

@@ -234,7 +234,7 @@ static int nf_hook_bridge_pre(struct sk_buff *skb, struct sk_buff **pskb)
 			kfree_skb(skb);
 			return RX_HANDLER_CONSUMED;
 		case NF_QUEUE:
-			ret = nf_queue(skb, &state, e, i, verdict);
+			ret = nf_queue(skb, &state, i, verdict);
 			if (ret == 1)
 				continue;
 			return RX_HANDLER_CONSUMED;

net/bridge/br_vlan.c

@@ -797,6 +797,16 @@ bool br_vlan_enabled(const struct net_device *dev)
 }
 EXPORT_SYMBOL_GPL(br_vlan_enabled);
 
+int br_vlan_get_proto(const struct net_device *dev, u16 *p_proto)
+{
+	struct net_bridge *br = netdev_priv(dev);
+
+	*p_proto = ntohs(br->vlan_proto);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(br_vlan_get_proto);
+
 int __br_vlan_set_proto(struct net_bridge *br, __be16 proto)
 {
 	int err = 0;
@@ -1227,13 +1237,11 @@ void br_vlan_get_stats(const struct net_bridge_vlan *v,
 	}
 }
 
-int br_vlan_get_pvid(const struct net_device *dev, u16 *p_pvid)
+static int __br_vlan_get_pvid(const struct net_device *dev,
+			      struct net_bridge_port *p, u16 *p_pvid)
 {
 	struct net_bridge_vlan_group *vg;
-	struct net_bridge_port *p;
 
-	ASSERT_RTNL();
-	p = br_port_get_check_rtnl(dev);
 	if (p)
 		vg = nbp_vlan_group(p);
 	else if (netif_is_bridge_master(dev))
@@ -1244,8 +1252,21 @@ int br_vlan_get_pvid(const struct net_device *dev, u16 *p_pvid)
 	*p_pvid = br_get_pvid(vg);
 	return 0;
 }
+
+int br_vlan_get_pvid(const struct net_device *dev, u16 *p_pvid)
+{
+	ASSERT_RTNL();
+
+	return __br_vlan_get_pvid(dev, br_port_get_check_rtnl(dev), p_pvid);
+}
 EXPORT_SYMBOL_GPL(br_vlan_get_pvid);
 
+int br_vlan_get_pvid_rcu(const struct net_device *dev, u16 *p_pvid)
+{
+	return __br_vlan_get_pvid(dev, br_port_get_check_rcu(dev), p_pvid);
+}
+EXPORT_SYMBOL_GPL(br_vlan_get_pvid_rcu);
+
 int br_vlan_get_info(const struct net_device *dev, u16 vid,
 		     struct bridge_vlan_info *p_vinfo)
 {

net/bridge/netfilter/Kconfig

@@ -9,6 +9,12 @@ menuconfig NF_TABLES_BRIDGE
 	bool "Ethernet Bridge nf_tables support"
 
 if NF_TABLES_BRIDGE
+
+config NFT_BRIDGE_META
+	tristate "Netfilter nf_table bridge meta support"
+	help
+	  Add support for bridge dedicated meta key.
+
 config NFT_BRIDGE_REJECT
 	tristate "Netfilter nf_tables bridge reject support"
 	depends on NFT_REJECT && NFT_REJECT_IPV4 && NFT_REJECT_IPV6

net/bridge/netfilter/Makefile

@@ -3,6 +3,7 @@
 # Makefile for the netfilter modules for Link Layer filtering on a bridge.
 #
 
+obj-$(CONFIG_NFT_BRIDGE_META)  += nft_meta_bridge.o
 obj-$(CONFIG_NFT_BRIDGE_REJECT)  += nft_reject_bridge.o
 
 # connection tracking

net/bridge/netfilter/nft_meta_bridge.c

+// SPDX-License-Identifier: GPL-2.0
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/netlink.h>
+#include <linux/netfilter.h>
+#include <linux/netfilter/nf_tables.h>
+#include <net/netfilter/nf_tables.h>
+#include <net/netfilter/nft_meta.h>
+#include <linux/if_bridge.h>
+
+static const struct net_device *
+nft_meta_get_bridge(const struct net_device *dev)
+{
+	if (dev && netif_is_bridge_port(dev))
+		return netdev_master_upper_dev_get_rcu((struct net_device *)dev);
+
+	return NULL;
+}
+
+static void nft_meta_bridge_get_eval(const struct nft_expr *expr,
+				     struct nft_regs *regs,
+				     const struct nft_pktinfo *pkt)
+{
+	const struct nft_meta *priv = nft_expr_priv(expr);
+	const struct net_device *in = nft_in(pkt), *out = nft_out(pkt);
+	u32 *dest = &regs->data[priv->dreg];
+	const struct net_device *br_dev;
+
+	switch (priv->key) {
+	case NFT_META_BRI_IIFNAME:
+		br_dev = nft_meta_get_bridge(in);
+		if (!br_dev)
+			goto err;
+		break;
+	case NFT_META_BRI_OIFNAME:
+		br_dev = nft_meta_get_bridge(out);
+		if (!br_dev)
+			goto err;
+		break;
+	case NFT_META_BRI_IIFPVID: {
+		u16 p_pvid;
+
+		br_dev = nft_meta_get_bridge(in);
+		if (!br_dev || !br_vlan_enabled(br_dev))
+			goto err;
+
+		br_vlan_get_pvid_rcu(in, &p_pvid);
+		nft_reg_store16(dest, p_pvid);
+		return;
+	}
+	case NFT_META_BRI_IIFVPROTO: {
+		u16 p_proto;
+
+		br_dev = nft_meta_get_bridge(in);
+		if (!br_dev || !br_vlan_enabled(br_dev))
+			goto err;
+
+		br_vlan_get_proto(br_dev, &p_proto);
+		nft_reg_store16(dest, p_proto);
+		return;
+	}
+	default:
+		goto out;
+	}
+
+	strncpy((char *)dest, br_dev->name, IFNAMSIZ);
+	return;
+out:
+	return nft_meta_get_eval(expr, regs, pkt);
+err:
+	regs->verdict.code = NFT_BREAK;
+}
+
+static int nft_meta_bridge_get_init(const struct nft_ctx *ctx,
+				    const struct nft_expr *expr,
+				    const struct nlattr * const tb[])
+{
+	struct nft_meta *priv = nft_expr_priv(expr);
+	unsigned int len;
+
+	priv->key = ntohl(nla_get_be32(tb[NFTA_META_KEY]));
+	switch (priv->key) {
+	case NFT_META_BRI_IIFNAME:
+	case NFT_META_BRI_OIFNAME:
+		len = IFNAMSIZ;
+		break;
+	case NFT_META_BRI_IIFPVID:
+	case NFT_META_BRI_IIFVPROTO:
+		len = sizeof(u16);
+		break;
+	default:
+		return nft_meta_get_init(ctx, expr, tb);
+	}
+
+	priv->dreg = nft_parse_register(tb[NFTA_META_DREG]);
+	return nft_validate_register_store(ctx, priv->dreg, NULL,
+					   NFT_DATA_VALUE, len);
+}
+
+static struct nft_expr_type nft_meta_bridge_type;
+static const struct nft_expr_ops nft_meta_bridge_get_ops = {
+	.type		= &nft_meta_bridge_type,
+	.size		= NFT_EXPR_SIZE(sizeof(struct nft_meta)),
+	.eval		= nft_meta_bridge_get_eval,
+	.init		= nft_meta_bridge_get_init,
+	.dump		= nft_meta_get_dump,
+};
+
+static const struct nft_expr_ops nft_meta_bridge_set_ops = {
+	.type		= &nft_meta_bridge_type,
+	.size		= NFT_EXPR_SIZE(sizeof(struct nft_meta)),
+	.eval		= nft_meta_set_eval,
+	.init		= nft_meta_set_init,
+	.destroy	= nft_meta_set_destroy,
+	.dump		= nft_meta_set_dump,
+	.validate	= nft_meta_set_validate,
+};
+
+static const struct nft_expr_ops *
+nft_meta_bridge_select_ops(const struct nft_ctx *ctx,
+			   const struct nlattr * const tb[])
+{
+	if (tb[NFTA_META_KEY] == NULL)
+		return ERR_PTR(-EINVAL);
+
+	if (tb[NFTA_META_DREG] && tb[NFTA_META_SREG])
+		return ERR_PTR(-EINVAL);
+
+	if (tb[NFTA_META_DREG])
+		return &nft_meta_bridge_get_ops;
+
+	if (tb[NFTA_META_SREG])
+		return &nft_meta_bridge_set_ops;
+
+	return ERR_PTR(-EINVAL);
+}
+
+static struct nft_expr_type nft_meta_bridge_type __read_mostly = {
+	.family         = NFPROTO_BRIDGE,
+	.name           = "meta",
+	.select_ops     = nft_meta_bridge_select_ops,
+	.policy         = nft_meta_policy,
+	.maxattr        = NFTA_META_MAX,
+	.owner          = THIS_MODULE,
+};
+
+static int __init nft_meta_bridge_module_init(void)
+{
+	return nft_register_expr(&nft_meta_bridge_type);
+}
+
+static void __exit nft_meta_bridge_module_exit(void)
+{
+	nft_unregister_expr(&nft_meta_bridge_type);
+}
+
+module_init(nft_meta_bridge_module_init);
+module_exit(nft_meta_bridge_module_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("wenxu <wenxu@ucloud.cn>");
+MODULE_ALIAS_NFT_AF_EXPR(AF_BRIDGE, "meta");

net/netfilter/Kconfig

@@ -651,6 +651,17 @@ config NFT_TPROXY
 	help
 	  This makes transparent proxy support available in nftables.
 
+config NFT_SYNPROXY
+	tristate "Netfilter nf_tables SYNPROXY expression support"
+	depends on NF_CONNTRACK && NETFILTER_ADVANCED
+	select NETFILTER_SYNPROXY
+	select SYN_COOKIES
+	help
+	  The SYNPROXY expression allows you to intercept TCP connections and
+	  establish them using syncookies before they are passed on to the
+	  server. This allows to avoid conntrack and server resource usage
+	  during SYN-flood attacks.
+
 if NF_TABLES_NETDEV
 
 config NF_DUP_NETDEV

net/netfilter/Makefile

@@ -110,6 +110,7 @@ obj-$(CONFIG_NFT_SOCKET)	+= nft_socket.o
 obj-$(CONFIG_NFT_OSF)		+= nft_osf.o
 obj-$(CONFIG_NFT_TPROXY)	+= nft_tproxy.o
 obj-$(CONFIG_NFT_XFRM)		+= nft_xfrm.o
+obj-$(CONFIG_NFT_SYNPROXY)	+= nft_synproxy.o
 
 obj-$(CONFIG_NFT_NAT)		+= nft_chain_nat.o
 

net/netfilter/core.c

@@ -520,7 +520,7 @@ int nf_hook_slow(struct sk_buff *skb, struct nf_hook_state *state,
 				ret = -EPERM;
 			return ret;
 		case NF_QUEUE:
-			ret = nf_queue(skb, state, e, s, verdict);
+			ret = nf_queue(skb, state, s, verdict);
 			if (ret == 1)
 				continue;
 			return ret;

net/netfilter/ipvs/ip_vs_core.c

@@ -35,6 +35,7 @@
 #include <net/udp.h>
 #include <net/icmp.h>                   /* for icmp_send */
 #include <net/gue.h>
+#include <net/gre.h>
 #include <net/route.h>
 #include <net/ip6_checksum.h>
 #include <net/netns/generic.h>		/* net_generic() */
@@ -1610,6 +1611,38 @@ static int ipvs_udp_decap(struct netns_ipvs *ipvs, struct sk_buff *skb,
 	return 0;
 }
 
+/* Check the GRE tunnel and return its header length */
+static int ipvs_gre_decap(struct netns_ipvs *ipvs, struct sk_buff *skb,
+			  unsigned int offset, __u16 af,
+			  const union nf_inet_addr *daddr, __u8 *proto)
+{
+	struct gre_base_hdr _greh, *greh;
+	struct ip_vs_dest *dest;
+
+	greh = skb_header_pointer(skb, offset, sizeof(_greh), &_greh);
+	if (!greh)
+		goto unk;
+	dest = ip_vs_find_tunnel(ipvs, af, daddr, 0);
+	if (!dest)
+		goto unk;
+	if (dest->tun_type == IP_VS_CONN_F_TUNNEL_TYPE_GRE) {
+		__be16 type;
+
+		/* Only support version 0 and C (csum) */
+		if ((greh->flags & ~GRE_CSUM) != 0)
+			goto unk;
+		type = greh->protocol;
+		/* Later we can support also IPPROTO_IPV6 */
+		if (type != htons(ETH_P_IP))
+			goto unk;
+		*proto = IPPROTO_IPIP;
+		return gre_calc_hlen(gre_flags_to_tnl_flags(greh->flags));
+	}
+
+unk:
+	return 0;
+}
+
 /*
  *	Handle ICMP messages in the outside-to-inside direction (incoming).
  *	Find any that might be relevant, check against existing connections,
@@ -1689,7 +1722,8 @@ ip_vs_in_icmp(struct netns_ipvs *ipvs, struct sk_buff *skb, int *related,
 		if (cih == NULL)
 			return NF_ACCEPT; /* The packet looks wrong, ignore */
 		ipip = true;
-	} else if (cih->protocol == IPPROTO_UDP &&	/* Can be UDP encap */
+	} else if ((cih->protocol == IPPROTO_UDP ||	/* Can be UDP encap */
+		    cih->protocol == IPPROTO_GRE) &&	/* Can be GRE encap */
 		   /* Error for our tunnel must arrive at LOCAL_IN */
 		   (skb_rtable(skb)->rt_flags & RTCF_LOCAL)) {
 		__u8 iproto;
@@ -1699,10 +1733,14 @@ ip_vs_in_icmp(struct netns_ipvs *ipvs, struct sk_buff *skb, int *related,
 		if (unlikely(cih->frag_off & htons(IP_OFFSET)))
 			return NF_ACCEPT;
 		offset2 = offset + cih->ihl * 4;
-		ulen = ipvs_udp_decap(ipvs, skb, offset2, AF_INET, raddr,
-				      &iproto);
+		if (cih->protocol == IPPROTO_UDP)
+			ulen = ipvs_udp_decap(ipvs, skb, offset2, AF_INET,
+					      raddr, &iproto);
+		else
+			ulen = ipvs_gre_decap(ipvs, skb, offset2, AF_INET,
+					      raddr, &iproto);
 		if (ulen > 0) {
-			/* Skip IP and UDP tunnel headers */
+			/* Skip IP and UDP/GRE tunnel headers */
 			offset = offset2 + ulen;
 			/* Now we should be at the original IP header */
 			cih = skb_header_pointer(skb, offset, sizeof(_ciph),

net/netfilter/ipvs/ip_vs_ctl.c

@@ -525,6 +525,7 @@ static void ip_vs_rs_hash(struct netns_ipvs *ipvs, struct ip_vs_dest *dest)
 			port = dest->tun_port;
 			break;
 		case IP_VS_CONN_F_TUNNEL_TYPE_IPIP:
+		case IP_VS_CONN_F_TUNNEL_TYPE_GRE:
 			port = 0;
 			break;
 		default:

net/netfilter/ipvs/ip_vs_xmit.c

@@ -29,6 +29,7 @@
 #include <linux/tcp.h>                  /* for tcphdr */
 #include <net/ip.h>
 #include <net/gue.h>
+#include <net/gre.h>
 #include <net/tcp.h>                    /* for csum_tcpudp_magic */
 #include <net/udp.h>
 #include <net/icmp.h>                   /* for icmp_send */
@@ -388,6 +389,12 @@ __ip_vs_get_out_rt(struct netns_ipvs *ipvs, int skb_af, struct sk_buff *skb,
 			     IP_VS_TUNNEL_ENCAP_FLAG_REMCSUM) &&
 			    skb->ip_summed == CHECKSUM_PARTIAL)
 				mtu -= GUE_PLEN_REMCSUM + GUE_LEN_PRIV;
+		} else if (dest->tun_type == IP_VS_CONN_F_TUNNEL_TYPE_GRE) {
+			__be16 tflags = 0;
+
+			if (dest->tun_flags & IP_VS_TUNNEL_ENCAP_FLAG_CSUM)
+				tflags |= TUNNEL_CSUM;
+			mtu -= gre_calc_hlen(tflags);
 		}
 		if (mtu < 68) {
 			IP_VS_DBG_RL("%s(): mtu less than 68\n", __func__);
@@ -548,6 +555,12 @@ __ip_vs_get_out_rt_v6(struct netns_ipvs *ipvs, int skb_af, struct sk_buff *skb,
 			     IP_VS_TUNNEL_ENCAP_FLAG_REMCSUM) &&
 			    skb->ip_summed == CHECKSUM_PARTIAL)
 				mtu -= GUE_PLEN_REMCSUM + GUE_LEN_PRIV;
+		} else if (dest->tun_type == IP_VS_CONN_F_TUNNEL_TYPE_GRE) {
+			__be16 tflags = 0;
+
+			if (dest->tun_flags & IP_VS_TUNNEL_ENCAP_FLAG_CSUM)
+				tflags |= TUNNEL_CSUM;
+			mtu -= gre_calc_hlen(tflags);
 		}
 		if (mtu < IPV6_MIN_MTU) {
 			IP_VS_DBG_RL("%s(): mtu less than %d\n", __func__,
@@ -1079,6 +1092,24 @@ ipvs_gue_encap(struct net *net, struct sk_buff *skb,
 	return 0;
 }
 
+static void
+ipvs_gre_encap(struct net *net, struct sk_buff *skb,
+	       struct ip_vs_conn *cp, __u8 *next_protocol)
+{
+	__be16 proto = *next_protocol == IPPROTO_IPIP ?
+				htons(ETH_P_IP) : htons(ETH_P_IPV6);
+	__be16 tflags = 0;
+	size_t hdrlen;
+
+	if (cp->dest->tun_flags & IP_VS_TUNNEL_ENCAP_FLAG_CSUM)
+		tflags |= TUNNEL_CSUM;
+
+	hdrlen = gre_calc_hlen(tflags);
+	gre_build_header(skb, hdrlen, tflags, proto, 0, 0);
+
+	*next_protocol = IPPROTO_GRE;
+}
+
 /*
  *   IP Tunneling transmitter
  *
@@ -1151,6 +1182,15 @@ ip_vs_tunnel_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
 		gue_hdrlen = sizeof(struct guehdr) + gue_optlen;
 
 		max_headroom += sizeof(struct udphdr) + gue_hdrlen;
+	} else if (tun_type == IP_VS_CONN_F_TUNNEL_TYPE_GRE) {
+		size_t gre_hdrlen;
+		__be16 tflags = 0;
+
+		if (tun_flags & IP_VS_TUNNEL_ENCAP_FLAG_CSUM)
+			tflags |= TUNNEL_CSUM;
+		gre_hdrlen = gre_calc_hlen(tflags);
+
+		max_headroom += gre_hdrlen;
 	}
 
 	/* We only care about the df field if sysctl_pmtu_disc(ipvs) is set */
@@ -1172,6 +1212,11 @@ ip_vs_tunnel_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
 		    skb->ip_summed == CHECKSUM_PARTIAL) {
 			gso_type |= SKB_GSO_TUNNEL_REMCSUM;
 		}
+	} else if (tun_type == IP_VS_CONN_F_TUNNEL_TYPE_GRE) {
+		if (tun_flags & IP_VS_TUNNEL_ENCAP_FLAG_CSUM)
+			gso_type |= SKB_GSO_GRE_CSUM;
+		else
+			gso_type |= SKB_GSO_GRE;
 	}
 
 	if (iptunnel_handle_offloads(skb, gso_type))
@@ -1192,8 +1237,8 @@ ip_vs_tunnel_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
 			check = true;
 
 		udp_set_csum(!check, skb, saddr, cp->daddr.ip, skb->len);
-	}
-
+	} else if (tun_type == IP_VS_CONN_F_TUNNEL_TYPE_GRE)
+		ipvs_gre_encap(net, skb, cp, &next_protocol);
 
 	skb_push(skb, sizeof(struct iphdr));
 	skb_reset_network_header(skb);
@@ -1287,6 +1332,15 @@ ip_vs_tunnel_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
 		gue_hdrlen = sizeof(struct guehdr) + gue_optlen;
 
 		max_headroom += sizeof(struct udphdr) + gue_hdrlen;
+	} else if (tun_type == IP_VS_CONN_F_TUNNEL_TYPE_GRE) {
+		size_t gre_hdrlen;
+		__be16 tflags = 0;
+
+		if (tun_flags & IP_VS_TUNNEL_ENCAP_FLAG_CSUM)
+			tflags |= TUNNEL_CSUM;
+		gre_hdrlen = gre_calc_hlen(tflags);
+
+		max_headroom += gre_hdrlen;
 	}
 
 	skb = ip_vs_prepare_tunneled_skb(skb, cp->af, max_headroom,
@@ -1306,6 +1360,11 @@ ip_vs_tunnel_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
 		    skb->ip_summed == CHECKSUM_PARTIAL) {
 			gso_type |= SKB_GSO_TUNNEL_REMCSUM;
 		}
+	} else if (tun_type == IP_VS_CONN_F_TUNNEL_TYPE_GRE) {
+		if (tun_flags & IP_VS_TUNNEL_ENCAP_FLAG_CSUM)
+			gso_type |= SKB_GSO_GRE_CSUM;
+		else
+			gso_type |= SKB_GSO_GRE;
 	}
 
 	if (iptunnel_handle_offloads(skb, gso_type))
@@ -1326,7 +1385,8 @@ ip_vs_tunnel_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
 			check = true;
 
 		udp6_set_csum(!check, skb, &saddr, &cp->daddr.in6, skb->len);
-	}
+	} else if (tun_type == IP_VS_CONN_F_TUNNEL_TYPE_GRE)
+		ipvs_gre_encap(net, skb, cp, &next_protocol);
 
 	skb_push(skb, sizeof(struct ipv6hdr));
 	skb_reset_network_header(skb);

net/netfilter/nf_log.c

@@ -374,7 +374,7 @@ static int seq_show(struct seq_file *s, void *v)
 			continue;
 
 		logger = nft_log_dereference(loggers[*pos][i]);
-		seq_printf(s, "%s", logger->name);
+		seq_puts(s, logger->name);
 		if (i == 0 && loggers[*pos][i + 1] != NULL)
 			seq_puts(s, ",");
 

net/netfilter/nf_queue.c

@@ -156,7 +156,6 @@ static void nf_ip6_saveroute(const struct sk_buff *skb,
 }
 
 static int __nf_queue(struct sk_buff *skb, const struct nf_hook_state *state,
-		      const struct nf_hook_entries *entries,
 		      unsigned int index, unsigned int queuenum)
 {
 	int status = -ENOENT;
@@ -225,12 +224,11 @@ static int __nf_queue(struct sk_buff *skb, const struct nf_hook_state *state,
 
 /* Packets leaving via this function must come back through nf_reinject(). */
 int nf_queue(struct sk_buff *skb, struct nf_hook_state *state,
-	     const struct nf_hook_entries *entries, unsigned int index,
-	     unsigned int verdict)
+	     unsigned int index, unsigned int verdict)
 {
 	int ret;
 
-	ret = __nf_queue(skb, state, entries, index, verdict >> NF_VERDICT_QBITS);
+	ret = __nf_queue(skb, state, index, verdict >> NF_VERDICT_QBITS);
 	if (ret < 0) {
 		if (ret == -ESRCH &&
 		    (verdict & NF_VERDICT_FLAG_QUEUE_BYPASS))
@@ -336,7 +334,7 @@ void nf_reinject(struct nf_queue_entry *entry, unsigned int verdict)
 		local_bh_enable();
 		break;
 	case NF_QUEUE:
-		err = nf_queue(skb, &entry->state, hooks, i, verdict);
+		err = nf_queue(skb, &entry->state, i, verdict);
 		if (err == 1)
 			goto next_hook;
 		break;

net/netfilter/nf_synproxy_core.c

@@ -11,7 +11,7 @@
 #include <linux/proc_fs.h>
 
 #include <linux/netfilter_ipv6.h>
-#include <linux/netfilter/nf_SYNPROXY.h>
+#include <linux/netfilter/nf_synproxy.h>
 
 #include <net/netfilter/nf_conntrack.h>
 #include <net/netfilter/nf_conntrack_ecache.h>

net/netfilter/nf_tables_api.c

@@ -2009,16 +2009,32 @@ EXPORT_SYMBOL_GPL(nft_unregister_expr);
 static const struct nft_expr_type *__nft_expr_type_get(u8 family,
 						       struct nlattr *nla)
 {
-	const struct nft_expr_type *type;
+	const struct nft_expr_type *type, *candidate = NULL;
 
 	list_for_each_entry(type, &nf_tables_expressions, list) {
-		if (!nla_strcmp(nla, type->name) &&
-		    (!type->family || type->family == family))
-			return type;
+		if (!nla_strcmp(nla, type->name)) {
+			if (!type->family && !candidate)
+				candidate = type;
+			else if (type->family == family)
+				candidate = type;
 		}
-	return NULL;
+	}
+	return candidate;
 }
 
+#ifdef CONFIG_MODULES
+static int nft_expr_type_request_module(struct net *net, u8 family,
+					struct nlattr *nla)
+{
+	nft_request_module(net, "nft-expr-%u-%.*s", family,
+			   nla_len(nla), (char *)nla_data(nla));
+	if (__nft_expr_type_get(family, nla))
+		return -EAGAIN;
+
+	return 0;
+}
+#endif
+
 static const struct nft_expr_type *nft_expr_type_get(struct net *net,
 						     u8 family,
 						     struct nlattr *nla)
@@ -2035,9 +2051,7 @@ static const struct nft_expr_type *nft_expr_type_get(struct net *net,
 	lockdep_nfnl_nft_mutex_not_held();
 #ifdef CONFIG_MODULES
 	if (type == NULL) {
-		nft_request_module(net, "nft-expr-%u-%.*s", family,
-				   nla_len(nla), (char *)nla_data(nla));
-		if (__nft_expr_type_get(family, nla))
+		if (nft_expr_type_request_module(net, family, nla) == -EAGAIN)
 			return ERR_PTR(-EAGAIN);
 
 		nft_request_module(net, "nft-expr-%.*s",
@@ -2130,6 +2144,12 @@ static int nf_tables_expr_parse(const struct nft_ctx *ctx,
 				       (const struct nlattr * const *)info->tb);
 		if (IS_ERR(ops)) {
 			err = PTR_ERR(ops);
+#ifdef CONFIG_MODULES
+			if (err == -EAGAIN)
+				nft_expr_type_request_module(ctx->net,
+							     ctx->family,
+							     tb[NFTA_EXPR_NAME]);
+#endif
 			goto err1;
 		}
 	} else

net/netfilter/nf_tables_core.c

@@ -19,6 +19,7 @@
 #include <net/netfilter/nf_tables_core.h>
 #include <net/netfilter/nf_tables.h>
 #include <net/netfilter/nf_log.h>
+#include <net/netfilter/nft_meta.h>
 
 static noinline void __nft_trace_packet(struct nft_traceinfo *info,
 					const struct nft_chain *chain,

net/netfilter/nft_meta.c

@@ -21,23 +21,12 @@
 #include <net/tcp_states.h> /* for TCP_TIME_WAIT */
 #include <net/netfilter/nf_tables.h>
 #include <net/netfilter/nf_tables_core.h>
+#include <net/netfilter/nft_meta.h>
 
 #include <uapi/linux/netfilter_bridge.h> /* NF_BR_PRE_ROUTING */
 
-struct nft_meta {
-	enum nft_meta_keys	key:8;
-	union {
-		enum nft_registers	dreg:8;
-		enum nft_registers	sreg:8;
-	};
-};
-
 static DEFINE_PER_CPU(struct rnd_state, nft_prandom_state);
 
-#ifdef CONFIG_NF_TABLES_BRIDGE
-#include "../bridge/br_private.h"
-#endif
-
 void nft_meta_get_eval(const struct nft_expr *expr,
 		       struct nft_regs *regs,
 		       const struct nft_pktinfo *pkt)
@@ -47,9 +36,6 @@ void nft_meta_get_eval(const struct nft_expr *expr,
 	const struct net_device *in = nft_in(pkt), *out = nft_out(pkt);
 	struct sock *sk;
 	u32 *dest = &regs->data[priv->dreg];
-#ifdef CONFIG_NF_TABLES_BRIDGE
-	const struct net_bridge_port *p;
-#endif
 
 	switch (priv->key) {
 	case NFT_META_LEN:
@@ -228,18 +214,6 @@ void nft_meta_get_eval(const struct nft_expr *expr,
 	case NFT_META_SECPATH:
 		nft_reg_store8(dest, secpath_exists(skb));
 		break;
-#endif
-#ifdef CONFIG_NF_TABLES_BRIDGE
-	case NFT_META_BRI_IIFNAME:
-		if (in == NULL || (p = br_port_get_rcu(in)) == NULL)
-			goto err;
-		strncpy((char *)dest, p->br->dev->name, IFNAMSIZ);
-		return;
-	case NFT_META_BRI_OIFNAME:
-		if (out == NULL || (p = br_port_get_rcu(out)) == NULL)
-			goto err;
-		strncpy((char *)dest, p->br->dev->name, IFNAMSIZ);
-		return;
 #endif
 	case NFT_META_IIFKIND:
 		if (in == NULL || in->rtnl_link_ops == NULL)
@@ -260,8 +234,9 @@ void nft_meta_get_eval(const struct nft_expr *expr,
 err:
 	regs->verdict.code = NFT_BREAK;
 }
+EXPORT_SYMBOL_GPL(nft_meta_get_eval);
 
-static void nft_meta_set_eval(const struct nft_expr *expr,
+void nft_meta_set_eval(const struct nft_expr *expr,
 		       struct nft_regs *regs,
 		       const struct nft_pktinfo *pkt)
 {
@@ -300,14 +275,16 @@ static void nft_meta_set_eval(const struct nft_expr *expr,
 		WARN_ON(1);
 	}
 }
+EXPORT_SYMBOL_GPL(nft_meta_set_eval);
 
-static const struct nla_policy nft_meta_policy[NFTA_META_MAX + 1] = {
+const struct nla_policy nft_meta_policy[NFTA_META_MAX + 1] = {
 	[NFTA_META_DREG]	= { .type = NLA_U32 },
 	[NFTA_META_KEY]		= { .type = NLA_U32 },
 	[NFTA_META_SREG]	= { .type = NLA_U32 },
 };
+EXPORT_SYMBOL_GPL(nft_meta_policy);
 
-static int nft_meta_get_init(const struct nft_ctx *ctx,
+int nft_meta_get_init(const struct nft_ctx *ctx,
 		      const struct nft_expr *expr,
 		      const struct nlattr * const tb[])
 {
@@ -359,14 +336,6 @@ static int nft_meta_get_init(const struct nft_ctx *ctx,
 	case NFT_META_SECPATH:
 		len = sizeof(u8);
 		break;
-#endif
-#ifdef CONFIG_NF_TABLES_BRIDGE
-	case NFT_META_BRI_IIFNAME:
-	case NFT_META_BRI_OIFNAME:
-		if (ctx->family != NFPROTO_BRIDGE)
-			return -EOPNOTSUPP;
-		len = IFNAMSIZ;
-		break;
 #endif
 	default:
 		return -EOPNOTSUPP;
@@ -376,6 +345,7 @@ static int nft_meta_get_init(const struct nft_ctx *ctx,
 	return nft_validate_register_store(ctx, priv->dreg, NULL,
 					   NFT_DATA_VALUE, len);
 }
+EXPORT_SYMBOL_GPL(nft_meta_get_init);
 
 static int nft_meta_get_validate(const struct nft_ctx *ctx,
 				 const struct nft_expr *expr,
@@ -409,7 +379,7 @@ static int nft_meta_get_validate(const struct nft_ctx *ctx,
 #endif
 }
 
-static int nft_meta_set_validate(const struct nft_ctx *ctx,
+int nft_meta_set_validate(const struct nft_ctx *ctx,
 			  const struct nft_expr *expr,
 			  const struct nft_data **data)
 {
@@ -437,8 +407,9 @@ static int nft_meta_set_validate(const struct nft_ctx *ctx,
 
 	return nft_chain_validate_hooks(ctx->chain, hooks);
 }
+EXPORT_SYMBOL_GPL(nft_meta_set_validate);
 
-static int nft_meta_set_init(const struct nft_ctx *ctx,
+int nft_meta_set_init(const struct nft_ctx *ctx,
 		      const struct nft_expr *expr,
 		      const struct nlattr * const tb[])
 {
@@ -475,8 +446,9 @@ static int nft_meta_set_init(const struct nft_ctx *ctx,
 
 	return 0;
 }
+EXPORT_SYMBOL_GPL(nft_meta_set_init);
 
-static int nft_meta_get_dump(struct sk_buff *skb,
+int nft_meta_get_dump(struct sk_buff *skb,
 		      const struct nft_expr *expr)
 {
 	const struct nft_meta *priv = nft_expr_priv(expr);
@@ -490,8 +462,9 @@ static int nft_meta_get_dump(struct sk_buff *skb,
 nla_put_failure:
 	return -1;
 }
+EXPORT_SYMBOL_GPL(nft_meta_get_dump);
 
-static int nft_meta_set_dump(struct sk_buff *skb, const struct nft_expr *expr)
+int nft_meta_set_dump(struct sk_buff *skb, const struct nft_expr *expr)
 {
 	const struct nft_meta *priv = nft_expr_priv(expr);
 
@@ -505,8 +478,9 @@ static int nft_meta_set_dump(struct sk_buff *skb, const struct nft_expr *expr)
 nla_put_failure:
 	return -1;
 }
+EXPORT_SYMBOL_GPL(nft_meta_set_dump);
 
-static void nft_meta_set_destroy(const struct nft_ctx *ctx,
+void nft_meta_set_destroy(const struct nft_ctx *ctx,
 			  const struct nft_expr *expr)
 {
 	const struct nft_meta *priv = nft_expr_priv(expr);
@@ -514,6 +488,7 @@ static void nft_meta_set_destroy(const struct nft_ctx *ctx,
 	if (priv->key == NFT_META_NFTRACE)
 		static_branch_dec(&nft_trace_enabled);
 }
+EXPORT_SYMBOL_GPL(nft_meta_set_destroy);
 
 static const struct nft_expr_ops nft_meta_get_ops = {
 	.type		= &nft_meta_type,
@@ -544,6 +519,10 @@ nft_meta_select_ops(const struct nft_ctx *ctx,
 	if (tb[NFTA_META_DREG] && tb[NFTA_META_SREG])
 		return ERR_PTR(-EINVAL);
 
+#ifdef CONFIG_NF_TABLES_BRIDGE
+	if (ctx->family == NFPROTO_BRIDGE)
+		return ERR_PTR(-EAGAIN);
+#endif
 	if (tb[NFTA_META_DREG])
 		return &nft_meta_get_ops;
 

net/netfilter/nft_synproxy.c

+// SPDX-License-Identifier: GPL-2.0
+#include <linux/types.h>
+#include <net/ip.h>
+#include <net/tcp.h>
+#include <net/netlink.h>
+#include <net/netfilter/nf_tables.h>
+#include <net/netfilter/nf_conntrack.h>
+#include <net/netfilter/nf_conntrack_synproxy.h>
+#include <net/netfilter/nf_synproxy.h>
+#include <linux/netfilter/nf_tables.h>
+#include <linux/netfilter/nf_synproxy.h>
+
+struct nft_synproxy {
+	struct nf_synproxy_info	info;
+};
+
+static const struct nla_policy nft_synproxy_policy[NFTA_SYNPROXY_MAX + 1] = {
+	[NFTA_SYNPROXY_MSS]		= { .type = NLA_U16 },
+	[NFTA_SYNPROXY_WSCALE]		= { .type = NLA_U8 },
+	[NFTA_SYNPROXY_FLAGS]		= { .type = NLA_U32 },
+};
+
+static void nft_synproxy_tcp_options(struct synproxy_options *opts,
+				     const struct tcphdr *tcp,
+				     struct synproxy_net *snet,
+				     struct nf_synproxy_info *info,
+				     struct nft_synproxy *priv)
+{
+	this_cpu_inc(snet->stats->syn_received);
+	if (tcp->ece && tcp->cwr)
+		opts->options |= NF_SYNPROXY_OPT_ECN;
+
+	opts->options &= priv->info.options;
+	if (opts->options & NF_SYNPROXY_OPT_TIMESTAMP)
+		synproxy_init_timestamp_cookie(info, opts);
+	else
+		opts->options &= ~(NF_SYNPROXY_OPT_WSCALE |
+				   NF_SYNPROXY_OPT_SACK_PERM |
+				   NF_SYNPROXY_OPT_ECN);
+}
+
+static void nft_synproxy_eval_v4(const struct nft_expr *expr,
+				 struct nft_regs *regs,
+				 const struct nft_pktinfo *pkt,
+				 const struct tcphdr *tcp,
+				 struct tcphdr *_tcph,
+				 struct synproxy_options *opts)
+{
+	struct nft_synproxy *priv = nft_expr_priv(expr);
+	struct nf_synproxy_info info = priv->info;
+	struct net *net = nft_net(pkt);
+	struct synproxy_net *snet = synproxy_pernet(net);
+	struct sk_buff *skb = pkt->skb;
+
+	if (tcp->syn) {
+		/* Initial SYN from client */
+		nft_synproxy_tcp_options(opts, tcp, snet, &info, priv);
+		synproxy_send_client_synack(net, skb, tcp, opts);
+		consume_skb(skb);
+		regs->verdict.code = NF_STOLEN;
+	} else if (tcp->ack) {
+		/* ACK from client */
+		if (synproxy_recv_client_ack(net, skb, tcp, opts,
+					     ntohl(tcp->seq))) {
+			consume_skb(skb);
+			regs->verdict.code = NF_STOLEN;
+		} else {
+			regs->verdict.code = NF_DROP;
+		}
+	}
+}
+
+#if IS_ENABLED(CONFIG_NF_TABLES_IPV6)
+static void nft_synproxy_eval_v6(const struct nft_expr *expr,
+				 struct nft_regs *regs,
+				 const struct nft_pktinfo *pkt,
+				 const struct tcphdr *tcp,
+				 struct tcphdr *_tcph,
+				 struct synproxy_options *opts)
+{
+	struct nft_synproxy *priv = nft_expr_priv(expr);
+	struct nf_synproxy_info info = priv->info;
+	struct net *net = nft_net(pkt);
+	struct synproxy_net *snet = synproxy_pernet(net);
+	struct sk_buff *skb = pkt->skb;
+
+	if (tcp->syn) {
+		/* Initial SYN from client */
+		nft_synproxy_tcp_options(opts, tcp, snet, &info, priv);
+		synproxy_send_client_synack_ipv6(net, skb, tcp, opts);
+		consume_skb(skb);
+		regs->verdict.code = NF_STOLEN;
+	} else if (tcp->ack) {
+		/* ACK from client */
+		if (synproxy_recv_client_ack_ipv6(net, skb, tcp, opts,
+						  ntohl(tcp->seq))) {
+			consume_skb(skb);
+			regs->verdict.code = NF_STOLEN;
+		} else {
+			regs->verdict.code = NF_DROP;
+		}
+	}
+}
+#endif /* CONFIG_NF_TABLES_IPV6*/
+
+static void nft_synproxy_eval(const struct nft_expr *expr,
+			      struct nft_regs *regs,
+			      const struct nft_pktinfo *pkt)
+{
+	struct synproxy_options opts = {};
+	struct sk_buff *skb = pkt->skb;
+	int thoff = pkt->xt.thoff;
+	const struct tcphdr *tcp;
+	struct tcphdr _tcph;
+
+	if (pkt->tprot != IPPROTO_TCP) {
+		regs->verdict.code = NFT_BREAK;
+		return;
+	}
+
+	if (nf_ip_checksum(skb, nft_hook(pkt), thoff, IPPROTO_TCP)) {
+		regs->verdict.code = NF_DROP;
+		return;
+	}
+
+	tcp = skb_header_pointer(skb, pkt->xt.thoff,
+				 sizeof(struct tcphdr),
+				 &_tcph);
+	if (!tcp) {
+		regs->verdict.code = NF_DROP;
+		return;
+	}
+
+	if (!synproxy_parse_options(skb, thoff, tcp, &opts)) {
+		regs->verdict.code = NF_DROP;
+		return;
+	}
+
+	switch (skb->protocol) {
+	case htons(ETH_P_IP):
+		nft_synproxy_eval_v4(expr, regs, pkt, tcp, &_tcph, &opts);
+		return;
+#if IS_ENABLED(CONFIG_NF_TABLES_IPV6)
+	case htons(ETH_P_IPV6):
+		nft_synproxy_eval_v6(expr, regs, pkt, tcp, &_tcph, &opts);
+		return;
+#endif
+	}
+	regs->verdict.code = NFT_BREAK;
+}
+
+static int nft_synproxy_init(const struct nft_ctx *ctx,
+			     const struct nft_expr *expr,
+			     const struct nlattr * const tb[])
+{
+	struct synproxy_net *snet = synproxy_pernet(ctx->net);
+	struct nft_synproxy *priv = nft_expr_priv(expr);
+	u32 flags;
+	int err;
+
+	if (tb[NFTA_SYNPROXY_MSS])
+		priv->info.mss = ntohs(nla_get_be16(tb[NFTA_SYNPROXY_MSS]));
+	if (tb[NFTA_SYNPROXY_WSCALE])
+		priv->info.wscale = nla_get_u8(tb[NFTA_SYNPROXY_WSCALE]);
+	if (tb[NFTA_SYNPROXY_FLAGS]) {
+		flags = ntohl(nla_get_be32(tb[NFTA_SYNPROXY_FLAGS]));
+		if (flags & ~NF_SYNPROXY_OPT_MASK)
+			return -EOPNOTSUPP;
+		priv->info.options = flags;
+	}
+
+	err = nf_ct_netns_get(ctx->net, ctx->family);
+	if (err)
+		return err;
+
+	switch (ctx->family) {
+	case NFPROTO_IPV4:
+		err = nf_synproxy_ipv4_init(snet, ctx->net);
+		if (err)
+			goto nf_ct_failure;
+		break;
+#if IS_ENABLED(CONFIG_NF_TABLES_IPV6)
+	case NFPROTO_IPV6:
+		err = nf_synproxy_ipv6_init(snet, ctx->net);
+		if (err)
+			goto nf_ct_failure;
+		break;
+#endif
+	case NFPROTO_INET:
+	case NFPROTO_BRIDGE:
+		err = nf_synproxy_ipv4_init(snet, ctx->net);
+		if (err)
+			goto nf_ct_failure;
+		err = nf_synproxy_ipv6_init(snet, ctx->net);
+		if (err)
+			goto nf_ct_failure;
+		break;
+	}
+
+	return 0;
+
+nf_ct_failure:
+	nf_ct_netns_put(ctx->net, ctx->family);
+	return err;
+}
+
+static void nft_synproxy_destroy(const struct nft_ctx *ctx,
+				 const struct nft_expr *expr)
+{
+	struct synproxy_net *snet = synproxy_pernet(ctx->net);
+
+	switch (ctx->family) {
+	case NFPROTO_IPV4:
+		nf_synproxy_ipv4_fini(snet, ctx->net);
+		break;
+#if IS_ENABLED(CONFIG_NF_TABLES_IPV6)
+	case NFPROTO_IPV6:
+		nf_synproxy_ipv6_fini(snet, ctx->net);
+		break;
+#endif
+	case NFPROTO_INET:
+	case NFPROTO_BRIDGE:
+		nf_synproxy_ipv4_fini(snet, ctx->net);
+		nf_synproxy_ipv6_fini(snet, ctx->net);
+		break;
+	}
+	nf_ct_netns_put(ctx->net, ctx->family);
+}
+
+static int nft_synproxy_dump(struct sk_buff *skb, const struct nft_expr *expr)
+{
+	const struct nft_synproxy *priv = nft_expr_priv(expr);
+
+	if (nla_put_be16(skb, NFTA_SYNPROXY_MSS, htons(priv->info.mss)) ||
+	    nla_put_u8(skb, NFTA_SYNPROXY_WSCALE, priv->info.wscale) ||
+	    nla_put_be32(skb, NFTA_SYNPROXY_FLAGS, htonl(priv->info.options)))
+		goto nla_put_failure;
+
+	return 0;
+
+nla_put_failure:
+	return -1;
+}
+
+static int nft_synproxy_validate(const struct nft_ctx *ctx,
+				 const struct nft_expr *expr,
+				 const struct nft_data **data)
+{
+	return nft_chain_validate_hooks(ctx->chain, (1 << NF_INET_LOCAL_IN) |
+						    (1 << NF_INET_FORWARD));
+}
+
+static struct nft_expr_type nft_synproxy_type;
+static const struct nft_expr_ops nft_synproxy_ops = {
+	.eval		= nft_synproxy_eval,
+	.size		= NFT_EXPR_SIZE(sizeof(struct nft_synproxy)),
+	.init		= nft_synproxy_init,
+	.destroy	= nft_synproxy_destroy,
+	.dump		= nft_synproxy_dump,
+	.type		= &nft_synproxy_type,
+	.validate	= nft_synproxy_validate,
+};
+
+static struct nft_expr_type nft_synproxy_type __read_mostly = {
+	.ops		= &nft_synproxy_ops,
+	.name		= "synproxy",
+	.owner		= THIS_MODULE,
+	.policy		= nft_synproxy_policy,
+	.maxattr	= NFTA_SYNPROXY_MAX,
+};
+
+static int __init nft_synproxy_module_init(void)
+{
+	return nft_register_expr(&nft_synproxy_type);
+}
+
+static void __exit nft_synproxy_module_exit(void)
+{
+	return nft_unregister_expr(&nft_synproxy_type);
+}
+
+module_init(nft_synproxy_module_init);
+module_exit(nft_synproxy_module_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Fernando Fernandez <ffmancera@riseup.net>");
+MODULE_ALIAS_NFT_EXPR("synproxy");