[mirror_ubuntu-jammy-kernel.git] / 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,
				     const 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;
	opts->mss_encode = opts->mss_option;
	opts->mss_option = info->mss;
	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_synproxy *priv,
				 struct nft_regs *regs,
				 const struct nft_pktinfo *pkt,
				 const struct tcphdr *tcp,
				 struct tcphdr *_tcph,
				 struct synproxy_options *opts)
{
	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_synproxy *priv,
				 struct nft_regs *regs,
				 const struct nft_pktinfo *pkt,
				 const struct tcphdr *tcp,
				 struct tcphdr *_tcph,
				 struct synproxy_options *opts)
{
	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_do_eval(const struct nft_synproxy *priv,
				 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(priv, regs, pkt, tcp, &_tcph, &opts);
		return;
#if IS_ENABLED(CONFIG_NF_TABLES_IPV6)
	case htons(ETH_P_IPV6):
		nft_synproxy_eval_v6(priv, regs, pkt, tcp, &_tcph, &opts);
		return;
#endif
	}
	regs->verdict.code = NFT_BREAK;
}

static int nft_synproxy_do_init(const struct nft_ctx *ctx,
				const struct nlattr * const tb[],
				struct nft_synproxy *priv)
{
	struct synproxy_net *snet = synproxy_pernet(ctx->net);
	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_do_destroy(const struct nft_ctx *ctx)
{
	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_do_dump(struct sk_buff *skb, struct nft_synproxy *priv)
{
	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 void nft_synproxy_eval(const struct nft_expr *expr,
			      struct nft_regs *regs,
			      const struct nft_pktinfo *pkt)
{
	const struct nft_synproxy *priv = nft_expr_priv(expr);

	nft_synproxy_do_eval(priv, regs, pkt);
}

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 int nft_synproxy_init(const struct nft_ctx *ctx,
			     const struct nft_expr *expr,
			     const struct nlattr * const tb[])
{
	struct nft_synproxy *priv = nft_expr_priv(expr);

	return nft_synproxy_do_init(ctx, tb, priv);
}

static void nft_synproxy_destroy(const struct nft_ctx *ctx,
				 const struct nft_expr *expr)
{
	nft_synproxy_do_destroy(ctx);
}

static int nft_synproxy_dump(struct sk_buff *skb, const struct nft_expr *expr)
{
	struct nft_synproxy *priv = nft_expr_priv(expr);

	return nft_synproxy_do_dump(skb, priv);
}

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 nft_synproxy_obj_init(const struct nft_ctx *ctx,
				 const struct nlattr * const tb[],
				 struct nft_object *obj)
{
	struct nft_synproxy *priv = nft_obj_data(obj);

	return nft_synproxy_do_init(ctx, tb, priv);
}

static void nft_synproxy_obj_destroy(const struct nft_ctx *ctx,
				     struct nft_object *obj)
{
	nft_synproxy_do_destroy(ctx);
}

static int nft_synproxy_obj_dump(struct sk_buff *skb,
				 struct nft_object *obj, bool reset)
{
	struct nft_synproxy *priv = nft_obj_data(obj);

	return nft_synproxy_do_dump(skb, priv);
}

static void nft_synproxy_obj_eval(struct nft_object *obj,
				  struct nft_regs *regs,
				  const struct nft_pktinfo *pkt)
{
	const struct nft_synproxy *priv = nft_obj_data(obj);

	nft_synproxy_do_eval(priv, regs, pkt);
}

static void nft_synproxy_obj_update(struct nft_object *obj,
				    struct nft_object *newobj)
{
	struct nft_synproxy *newpriv = nft_obj_data(newobj);
	struct nft_synproxy *priv = nft_obj_data(obj);

	priv->info = newpriv->info;
}

static struct nft_object_type nft_synproxy_obj_type;
static const struct nft_object_ops nft_synproxy_obj_ops = {
	.type		= &nft_synproxy_obj_type,
	.size		= sizeof(struct nft_synproxy),
	.init		= nft_synproxy_obj_init,
	.destroy	= nft_synproxy_obj_destroy,
	.dump		= nft_synproxy_obj_dump,
	.eval		= nft_synproxy_obj_eval,
	.update		= nft_synproxy_obj_update,
};

static struct nft_object_type nft_synproxy_obj_type __read_mostly = {
	.type		= NFT_OBJECT_SYNPROXY,
	.ops		= &nft_synproxy_obj_ops,
	.maxattr	= NFTA_SYNPROXY_MAX,
	.policy		= nft_synproxy_policy,
	.owner		= THIS_MODULE,
};

static int __init nft_synproxy_module_init(void)
{
	int err;

	err = nft_register_obj(&nft_synproxy_obj_type);
	if (err < 0)
		return err;

	err = nft_register_expr(&nft_synproxy_type);
	if (err < 0)
		goto err;

	return 0;

err:
	nft_unregister_obj(&nft_synproxy_obj_type);
	return err;
}

static void __exit nft_synproxy_module_exit(void)
{
	nft_unregister_expr(&nft_synproxy_type);
	nft_unregister_obj(&nft_synproxy_obj_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");
MODULE_ALIAS_NFT_OBJ(NFT_OBJECT_SYNPROXY);
Commit	Line	Data
ad49d86e FFM	1	// SPDX-License-Identifier: GPL-2.0
	2	#include <linux/types.h>
	3	#include <net/ip.h>
	4	#include <net/tcp.h>
	5	#include <net/netlink.h>
	6	#include <net/netfilter/nf_tables.h>
	7	#include <net/netfilter/nf_conntrack.h>
	8	#include <net/netfilter/nf_conntrack_synproxy.h>
	9	#include <net/netfilter/nf_synproxy.h>
	10	#include <linux/netfilter/nf_tables.h>
	11	#include <linux/netfilter/nf_synproxy.h>
	12
	13	struct nft_synproxy {
	14	struct nf_synproxy_info info;
	15	};
	16
	17	static const struct nla_policy nft_synproxy_policy[NFTA_SYNPROXY_MAX + 1] = {
	18	[NFTA_SYNPROXY_MSS] = { .type = NLA_U16 },
	19	[NFTA_SYNPROXY_WSCALE] = { .type = NLA_U8 },
	20	[NFTA_SYNPROXY_FLAGS] = { .type = NLA_U32 },
	21	};
	22
	23	static void nft_synproxy_tcp_options(struct synproxy_options *opts,
	24	const struct tcphdr *tcp,
	25	struct synproxy_net *snet,
	26	struct nf_synproxy_info *info,
ee394f96	27	const struct nft_synproxy *priv)
ad49d86e FFM	28	{
	29	this_cpu_inc(snet->stats->syn_received);
	30	if (tcp->ece && tcp->cwr)
	31	opts->options \|= NF_SYNPROXY_OPT_ECN;
	32
	33	opts->options &= priv->info.options;
8c0bb787 FFM	34	opts->mss_encode = opts->mss_option;
8c0bb787 FFM	35	opts->mss_option = info->mss;
ad49d86e FFM	36	if (opts->options & NF_SYNPROXY_OPT_TIMESTAMP)
	37	synproxy_init_timestamp_cookie(info, opts);
	38	else
	39	opts->options &= ~(NF_SYNPROXY_OPT_WSCALE \|
	40	NF_SYNPROXY_OPT_SACK_PERM \|
	41	NF_SYNPROXY_OPT_ECN);
	42	}
	43
ee394f96	44	static void nft_synproxy_eval_v4(const struct nft_synproxy *priv,
ad49d86e FFM	45	struct nft_regs *regs,
	46	const struct nft_pktinfo *pkt,
	47	const struct tcphdr *tcp,
	48	struct tcphdr *_tcph,
	49	struct synproxy_options *opts)
	50	{
ad49d86e FFM	51	struct nf_synproxy_info info = priv->info;
	52	struct net *net = nft_net(pkt);
	53	struct synproxy_net *snet = synproxy_pernet(net);
	54	struct sk_buff *skb = pkt->skb;
	55
	56	if (tcp->syn) {
	57	/* Initial SYN from client */
	58	nft_synproxy_tcp_options(opts, tcp, snet, &info, priv);
	59	synproxy_send_client_synack(net, skb, tcp, opts);
	60	consume_skb(skb);
	61	regs->verdict.code = NF_STOLEN;
	62	} else if (tcp->ack) {
	63	/* ACK from client */
	64	if (synproxy_recv_client_ack(net, skb, tcp, opts,
	65	ntohl(tcp->seq))) {
	66	consume_skb(skb);
	67	regs->verdict.code = NF_STOLEN;
	68	} else {
	69	regs->verdict.code = NF_DROP;
	70	}
	71	}
	72	}
	73
	74	#if IS_ENABLED(CONFIG_NF_TABLES_IPV6)
ee394f96	75	static void nft_synproxy_eval_v6(const struct nft_synproxy *priv,
ad49d86e FFM	76	struct nft_regs *regs,
	77	const struct nft_pktinfo *pkt,
	78	const struct tcphdr *tcp,
	79	struct tcphdr *_tcph,
	80	struct synproxy_options *opts)
	81	{
ad49d86e FFM	82	struct nf_synproxy_info info = priv->info;
	83	struct net *net = nft_net(pkt);
	84	struct synproxy_net *snet = synproxy_pernet(net);
	85	struct sk_buff *skb = pkt->skb;
	86
	87	if (tcp->syn) {
	88	/* Initial SYN from client */
	89	nft_synproxy_tcp_options(opts, tcp, snet, &info, priv);
	90	synproxy_send_client_synack_ipv6(net, skb, tcp, opts);
	91	consume_skb(skb);
	92	regs->verdict.code = NF_STOLEN;
	93	} else if (tcp->ack) {
	94	/* ACK from client */
	95	if (synproxy_recv_client_ack_ipv6(net, skb, tcp, opts,
	96	ntohl(tcp->seq))) {
	97	consume_skb(skb);
	98	regs->verdict.code = NF_STOLEN;
	99	} else {
	100	regs->verdict.code = NF_DROP;
	101	}
	102	}
	103	}
	104	#endif /* CONFIG_NF_TABLES_IPV6*/
	105
ee394f96 FFM	106	static void nft_synproxy_do_eval(const struct nft_synproxy *priv,
	107	struct nft_regs *regs,
	108	const struct nft_pktinfo *pkt)
ad49d86e FFM	109	{
	110	struct synproxy_options opts = {};
	111	struct sk_buff *skb = pkt->skb;
	112	int thoff = pkt->xt.thoff;
	113	const struct tcphdr *tcp;
	114	struct tcphdr _tcph;
	115
	116	if (pkt->tprot != IPPROTO_TCP) {
	117	regs->verdict.code = NFT_BREAK;
	118	return;
	119	}
	120
	121	if (nf_ip_checksum(skb, nft_hook(pkt), thoff, IPPROTO_TCP)) {
	122	regs->verdict.code = NF_DROP;
	123	return;
	124	}
	125
	126	tcp = skb_header_pointer(skb, pkt->xt.thoff,
	127	sizeof(struct tcphdr),
	128	&_tcph);
	129	if (!tcp) {
	130	regs->verdict.code = NF_DROP;
	131	return;
	132	}
	133
	134	if (!synproxy_parse_options(skb, thoff, tcp, &opts)) {
	135	regs->verdict.code = NF_DROP;
	136	return;
	137	}
	138
	139	switch (skb->protocol) {
	140	case htons(ETH_P_IP):
ee394f96	141	nft_synproxy_eval_v4(priv, regs, pkt, tcp, &_tcph, &opts);
ad49d86e FFM	142	return;
	143	#if IS_ENABLED(CONFIG_NF_TABLES_IPV6)
	144	case htons(ETH_P_IPV6):
ee394f96	145	nft_synproxy_eval_v6(priv, regs, pkt, tcp, &_tcph, &opts);
ad49d86e FFM	146	return;
	147	#endif
	148	}
	149	regs->verdict.code = NFT_BREAK;
	150	}
	151
ee394f96 FFM	152	static int nft_synproxy_do_init(const struct nft_ctx *ctx,
	153	const struct nlattr * const tb[],
	154	struct nft_synproxy *priv)
ad49d86e FFM	155	{
ad49d86e FFM	156	struct synproxy_net *snet = synproxy_pernet(ctx->net);
ad49d86e FFM	157	u32 flags;
	158	int err;
	159
	160	if (tb[NFTA_SYNPROXY_MSS])
	161	priv->info.mss = ntohs(nla_get_be16(tb[NFTA_SYNPROXY_MSS]));
	162	if (tb[NFTA_SYNPROXY_WSCALE])
	163	priv->info.wscale = nla_get_u8(tb[NFTA_SYNPROXY_WSCALE]);
	164	if (tb[NFTA_SYNPROXY_FLAGS]) {
	165	flags = ntohl(nla_get_be32(tb[NFTA_SYNPROXY_FLAGS]));
	166	if (flags & ~NF_SYNPROXY_OPT_MASK)
	167	return -EOPNOTSUPP;
	168	priv->info.options = flags;
	169	}
	170
	171	err = nf_ct_netns_get(ctx->net, ctx->family);
	172	if (err)
	173	return err;
	174
	175	switch (ctx->family) {
	176	case NFPROTO_IPV4:
	177	err = nf_synproxy_ipv4_init(snet, ctx->net);
	178	if (err)
	179	goto nf_ct_failure;
	180	break;
	181	#if IS_ENABLED(CONFIG_NF_TABLES_IPV6)
	182	case NFPROTO_IPV6:
	183	err = nf_synproxy_ipv6_init(snet, ctx->net);
	184	if (err)
	185	goto nf_ct_failure;
	186	break;
	187	#endif
	188	case NFPROTO_INET:
	189	case NFPROTO_BRIDGE:
	190	err = nf_synproxy_ipv4_init(snet, ctx->net);
	191	if (err)
	192	goto nf_ct_failure;
	193	err = nf_synproxy_ipv6_init(snet, ctx->net);
	194	if (err)
	195	goto nf_ct_failure;
	196	break;
	197	}
	198
	199	return 0;
	200
	201	nf_ct_failure:
	202	nf_ct_netns_put(ctx->net, ctx->family);
	203	return err;
	204	}
	205
ee394f96	206	static void nft_synproxy_do_destroy(const struct nft_ctx *ctx)
ad49d86e FFM	207	{
	208	struct synproxy_net *snet = synproxy_pernet(ctx->net);
	209
	210	switch (ctx->family) {
	211	case NFPROTO_IPV4:
	212	nf_synproxy_ipv4_fini(snet, ctx->net);
	213	break;
	214	#if IS_ENABLED(CONFIG_NF_TABLES_IPV6)
	215	case NFPROTO_IPV6:
	216	nf_synproxy_ipv6_fini(snet, ctx->net);
	217	break;
	218	#endif
	219	case NFPROTO_INET:
	220	case NFPROTO_BRIDGE:
	221	nf_synproxy_ipv4_fini(snet, ctx->net);
	222	nf_synproxy_ipv6_fini(snet, ctx->net);
	223	break;
	224	}
	225	nf_ct_netns_put(ctx->net, ctx->family);
	226	}
	227
ee394f96	228	static int nft_synproxy_do_dump(struct sk_buff skb, struct nft_synproxy priv)
ad49d86e	229	{
ad49d86e FFM	230	if (nla_put_be16(skb, NFTA_SYNPROXY_MSS, htons(priv->info.mss)) \|\|
	231	nla_put_u8(skb, NFTA_SYNPROXY_WSCALE, priv->info.wscale) \|\|
	232	nla_put_be32(skb, NFTA_SYNPROXY_FLAGS, htonl(priv->info.options)))
	233	goto nla_put_failure;
	234
	235	return 0;
	236
	237	nla_put_failure:
	238	return -1;
	239	}
	240
ee394f96 FFM	241	static void nft_synproxy_eval(const struct nft_expr *expr,
	242	struct nft_regs *regs,
	243	const struct nft_pktinfo *pkt)
	244	{
	245	const struct nft_synproxy *priv = nft_expr_priv(expr);
	246
	247	nft_synproxy_do_eval(priv, regs, pkt);
	248	}
	249
ad49d86e FFM	250	static int nft_synproxy_validate(const struct nft_ctx *ctx,
	251	const struct nft_expr *expr,
	252	const struct nft_data **data)
	253	{
	254	return nft_chain_validate_hooks(ctx->chain, (1 << NF_INET_LOCAL_IN) \|
	255	(1 << NF_INET_FORWARD));
	256	}
	257
ee394f96 FFM	258	static int nft_synproxy_init(const struct nft_ctx *ctx,
	259	const struct nft_expr *expr,
	260	const struct nlattr * const tb[])
	261	{
	262	struct nft_synproxy *priv = nft_expr_priv(expr);
	263
	264	return nft_synproxy_do_init(ctx, tb, priv);
	265	}
	266
	267	static void nft_synproxy_destroy(const struct nft_ctx *ctx,
	268	const struct nft_expr *expr)
	269	{
	270	nft_synproxy_do_destroy(ctx);
	271	}
	272
	273	static int nft_synproxy_dump(struct sk_buff skb, const struct nft_expr expr)
	274	{
	275	struct nft_synproxy *priv = nft_expr_priv(expr);
	276
	277	return nft_synproxy_do_dump(skb, priv);
	278	}
	279
ad49d86e FFM	280	static struct nft_expr_type nft_synproxy_type;
	281	static const struct nft_expr_ops nft_synproxy_ops = {
	282	.eval = nft_synproxy_eval,
	283	.size = NFT_EXPR_SIZE(sizeof(struct nft_synproxy)),
	284	.init = nft_synproxy_init,
	285	.destroy = nft_synproxy_destroy,
	286	.dump = nft_synproxy_dump,
	287	.type = &nft_synproxy_type,
	288	.validate = nft_synproxy_validate,
	289	};
	290
	291	static struct nft_expr_type nft_synproxy_type __read_mostly = {
	292	.ops = &nft_synproxy_ops,
	293	.name = "synproxy",
	294	.owner = THIS_MODULE,
	295	.policy = nft_synproxy_policy,
	296	.maxattr = NFTA_SYNPROXY_MAX,
	297	};
	298
ee394f96 FFM	299	static int nft_synproxy_obj_init(const struct nft_ctx *ctx,
	300	const struct nlattr * const tb[],
	301	struct nft_object *obj)
	302	{
	303	struct nft_synproxy *priv = nft_obj_data(obj);
	304
	305	return nft_synproxy_do_init(ctx, tb, priv);
	306	}
	307
	308	static void nft_synproxy_obj_destroy(const struct nft_ctx *ctx,
	309	struct nft_object *obj)
	310	{
	311	nft_synproxy_do_destroy(ctx);
	312	}
	313
	314	static int nft_synproxy_obj_dump(struct sk_buff *skb,
	315	struct nft_object *obj, bool reset)
	316	{
	317	struct nft_synproxy *priv = nft_obj_data(obj);
	318
	319	return nft_synproxy_do_dump(skb, priv);
	320	}
	321
	322	static void nft_synproxy_obj_eval(struct nft_object *obj,
	323	struct nft_regs *regs,
	324	const struct nft_pktinfo *pkt)
	325	{
	326	const struct nft_synproxy *priv = nft_obj_data(obj);
	327
	328	nft_synproxy_do_eval(priv, regs, pkt);
	329	}
	330
	331	static void nft_synproxy_obj_update(struct nft_object *obj,
	332	struct nft_object *newobj)
	333	{
	334	struct nft_synproxy *newpriv = nft_obj_data(newobj);
	335	struct nft_synproxy *priv = nft_obj_data(obj);
	336
	337	priv->info = newpriv->info;
	338	}
	339
	340	static struct nft_object_type nft_synproxy_obj_type;
	341	static const struct nft_object_ops nft_synproxy_obj_ops = {
	342	.type = &nft_synproxy_obj_type,
	343	.size = sizeof(struct nft_synproxy),
	344	.init = nft_synproxy_obj_init,
	345	.destroy = nft_synproxy_obj_destroy,
	346	.dump = nft_synproxy_obj_dump,
	347	.eval = nft_synproxy_obj_eval,
	348	.update = nft_synproxy_obj_update,
	349	};
	350
	351	static struct nft_object_type nft_synproxy_obj_type __read_mostly = {
	352	.type = NFT_OBJECT_SYNPROXY,
	353	.ops = &nft_synproxy_obj_ops,
	354	.maxattr = NFTA_SYNPROXY_MAX,
	355	.policy = nft_synproxy_policy,
	356	.owner = THIS_MODULE,
	357	};
	358
ad49d86e FFM	359	static int __init nft_synproxy_module_init(void)
ad49d86e FFM	360	{
ee394f96 FFM	361	int err;
	362
	363	err = nft_register_obj(&nft_synproxy_obj_type);
	364	if (err < 0)
	365	return err;
	366
	367	err = nft_register_expr(&nft_synproxy_type);
	368	if (err < 0)
	369	goto err;
	370
	371	return 0;
	372
	373	err:
	374	nft_unregister_obj(&nft_synproxy_obj_type);
	375	return err;
ad49d86e FFM	376	}
	377
	378	static void __exit nft_synproxy_module_exit(void)
	379	{
ee394f96 FFM	380	nft_unregister_expr(&nft_synproxy_type);
ee394f96 FFM	381	nft_unregister_obj(&nft_synproxy_obj_type);
ad49d86e FFM	382	}
	383
	384	module_init(nft_synproxy_module_init);
	385	module_exit(nft_synproxy_module_exit);
	386
	387	MODULE_LICENSE("GPL");
	388	MODULE_AUTHOR("Fernando Fernandez <ffmancera@riseup.net>");
	389	MODULE_ALIAS_NFT_EXPR("synproxy");
ee394f96	390	MODULE_ALIAS_NFT_OBJ(NFT_OBJECT_SYNPROXY);