[mirror_ubuntu-bionic-kernel.git] / net / netfilter / nft_meta.c

/*
 * Copyright (c) 2008-2009 Patrick McHardy <kaber@trash.net>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * Development of this code funded by Astaro AG (http://www.astaro.com/)
 */

#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 <linux/in.h>
#include <linux/ip.h>
#include <linux/ipv6.h>
#include <linux/smp.h>
#include <net/dst.h>
#include <net/sock.h>
#include <net/tcp_states.h> /* for TCP_TIME_WAIT */
#include <net/netfilter/nf_tables.h>
#include <net/netfilter/nft_meta.h>

void nft_meta_get_eval(const struct nft_expr *expr,
		       struct nft_data data[NFT_REG_MAX + 1],
		       const struct nft_pktinfo *pkt)
{
	const struct nft_meta *priv = nft_expr_priv(expr);
	const struct sk_buff *skb = pkt->skb;
	const struct net_device *in = pkt->in, *out = pkt->out;
	struct nft_data *dest = &data[priv->dreg];

	switch (priv->key) {
	case NFT_META_LEN:
		dest->data[0] = skb->len;
		break;
	case NFT_META_PROTOCOL:
		*(__be16 *)dest->data = skb->protocol;
		break;
	case NFT_META_NFPROTO:
		dest->data[0] = pkt->ops->pf;
		break;
	case NFT_META_L4PROTO:
		dest->data[0] = pkt->tprot;
		break;
	case NFT_META_PRIORITY:
		dest->data[0] = skb->priority;
		break;
	case NFT_META_MARK:
		dest->data[0] = skb->mark;
		break;
	case NFT_META_IIF:
		if (in == NULL)
			goto err;
		dest->data[0] = in->ifindex;
		break;
	case NFT_META_OIF:
		if (out == NULL)
			goto err;
		dest->data[0] = out->ifindex;
		break;
	case NFT_META_IIFNAME:
		if (in == NULL)
			goto err;
		strncpy((char *)dest->data, in->name, sizeof(dest->data));
		break;
	case NFT_META_OIFNAME:
		if (out == NULL)
			goto err;
		strncpy((char *)dest->data, out->name, sizeof(dest->data));
		break;
	case NFT_META_IIFTYPE:
		if (in == NULL)
			goto err;
		*(u16 *)dest->data = in->type;
		break;
	case NFT_META_OIFTYPE:
		if (out == NULL)
			goto err;
		*(u16 *)dest->data = out->type;
		break;
	case NFT_META_SKUID:
		if (skb->sk == NULL || !sk_fullsock(skb->sk))
			goto err;

		read_lock_bh(&skb->sk->sk_callback_lock);
		if (skb->sk->sk_socket == NULL ||
		    skb->sk->sk_socket->file == NULL) {
			read_unlock_bh(&skb->sk->sk_callback_lock);
			goto err;
		}

		dest->data[0] =
			from_kuid_munged(&init_user_ns,
				skb->sk->sk_socket->file->f_cred->fsuid);
		read_unlock_bh(&skb->sk->sk_callback_lock);
		break;
	case NFT_META_SKGID:
		if (skb->sk == NULL || !sk_fullsock(skb->sk))
			goto err;

		read_lock_bh(&skb->sk->sk_callback_lock);
		if (skb->sk->sk_socket == NULL ||
		    skb->sk->sk_socket->file == NULL) {
			read_unlock_bh(&skb->sk->sk_callback_lock);
			goto err;
		}
		dest->data[0] =
			from_kgid_munged(&init_user_ns,
				 skb->sk->sk_socket->file->f_cred->fsgid);
		read_unlock_bh(&skb->sk->sk_callback_lock);
		break;
#ifdef CONFIG_IP_ROUTE_CLASSID
	case NFT_META_RTCLASSID: {
		const struct dst_entry *dst = skb_dst(skb);

		if (dst == NULL)
			goto err;
		dest->data[0] = dst->tclassid;
		break;
	}
#endif
#ifdef CONFIG_NETWORK_SECMARK
	case NFT_META_SECMARK:
		dest->data[0] = skb->secmark;
		break;
#endif
	case NFT_META_PKTTYPE:
		if (skb->pkt_type != PACKET_LOOPBACK) {
			dest->data[0] = skb->pkt_type;
			break;
		}

		switch (pkt->ops->pf) {
		case NFPROTO_IPV4:
			if (ipv4_is_multicast(ip_hdr(skb)->daddr))
				dest->data[0] = PACKET_MULTICAST;
			else
				dest->data[0] = PACKET_BROADCAST;
			break;
		case NFPROTO_IPV6:
			if (ipv6_hdr(skb)->daddr.s6_addr[0] == 0xFF)
				dest->data[0] = PACKET_MULTICAST;
			else
				dest->data[0] = PACKET_BROADCAST;
			break;
		default:
			WARN_ON(1);
			goto err;
		}
		break;
	case NFT_META_CPU:
		dest->data[0] = raw_smp_processor_id();
		break;
	case NFT_META_IIFGROUP:
		if (in == NULL)
			goto err;
		dest->data[0] = in->group;
		break;
	case NFT_META_OIFGROUP:
		if (out == NULL)
			goto err;
		dest->data[0] = out->group;
		break;
	case NFT_META_CGROUP:
		if (skb->sk == NULL || !sk_fullsock(skb->sk))
			goto err;
		dest->data[0] = skb->sk->sk_classid;
		break;
	default:
		WARN_ON(1);
		goto err;
	}
	return;

err:
	data[NFT_REG_VERDICT].verdict = NFT_BREAK;
}
EXPORT_SYMBOL_GPL(nft_meta_get_eval);

void nft_meta_set_eval(const struct nft_expr *expr,
		       struct nft_data data[NFT_REG_MAX + 1],
		       const struct nft_pktinfo *pkt)
{
	const struct nft_meta *meta = nft_expr_priv(expr);
	struct sk_buff *skb = pkt->skb;
	u32 value = data[meta->sreg].data[0];

	switch (meta->key) {
	case NFT_META_MARK:
		skb->mark = value;
		break;
	case NFT_META_PRIORITY:
		skb->priority = value;
		break;
	case NFT_META_NFTRACE:
		skb->nf_trace = 1;
		break;
	default:
		WARN_ON(1);
	}
}
EXPORT_SYMBOL_GPL(nft_meta_set_eval);

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);

int nft_meta_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_PROTOCOL:
	case NFT_META_IIFTYPE:
	case NFT_META_OIFTYPE:
		len = sizeof(u16);
		break;
	case NFT_META_NFPROTO:
	case NFT_META_L4PROTO:
	case NFT_META_LEN:
	case NFT_META_PRIORITY:
	case NFT_META_MARK:
	case NFT_META_IIF:
	case NFT_META_OIF:
	case NFT_META_SKUID:
	case NFT_META_SKGID:
#ifdef CONFIG_IP_ROUTE_CLASSID
	case NFT_META_RTCLASSID:
#endif
#ifdef CONFIG_NETWORK_SECMARK
	case NFT_META_SECMARK:
#endif
	case NFT_META_PKTTYPE:
	case NFT_META_CPU:
	case NFT_META_IIFGROUP:
	case NFT_META_OIFGROUP:
	case NFT_META_CGROUP:
		len = sizeof(u32);
		break;
	case NFT_META_IIFNAME:
	case NFT_META_OIFNAME:
		len = IFNAMSIZ;
		break;
	default:
		return -EOPNOTSUPP;
	}

	priv->dreg = ntohl(nla_get_be32(tb[NFTA_META_DREG]));
	return nft_validate_register_store(ctx, priv->dreg, NULL,
					   NFT_DATA_VALUE, len);
}
EXPORT_SYMBOL_GPL(nft_meta_get_init);

int nft_meta_set_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;
	int err;

	priv->key = ntohl(nla_get_be32(tb[NFTA_META_KEY]));
	switch (priv->key) {
	case NFT_META_MARK:
	case NFT_META_PRIORITY:
		len = sizeof(u32);
		break;
	case NFT_META_NFTRACE:
		len = sizeof(u8);
		break;
	default:
		return -EOPNOTSUPP;
	}

	priv->sreg = ntohl(nla_get_be32(tb[NFTA_META_SREG]));
	err = nft_validate_register_load(priv->sreg, len);
	if (err < 0)
		return err;

	return 0;
}
EXPORT_SYMBOL_GPL(nft_meta_set_init);

int nft_meta_get_dump(struct sk_buff *skb,
		      const struct nft_expr *expr)
{
	const struct nft_meta *priv = nft_expr_priv(expr);

	if (nla_put_be32(skb, NFTA_META_KEY, htonl(priv->key)))
		goto nla_put_failure;
	if (nla_put_be32(skb, NFTA_META_DREG, htonl(priv->dreg)))
		goto nla_put_failure;
	return 0;

nla_put_failure:
	return -1;
}
EXPORT_SYMBOL_GPL(nft_meta_get_dump);

int nft_meta_set_dump(struct sk_buff *skb,
		      const struct nft_expr *expr)
{
	const struct nft_meta *priv = nft_expr_priv(expr);

	if (nla_put_be32(skb, NFTA_META_KEY, htonl(priv->key)))
		goto nla_put_failure;
	if (nla_put_be32(skb, NFTA_META_SREG, htonl(priv->sreg)))
		goto nla_put_failure;

	return 0;

nla_put_failure:
	return -1;
}
EXPORT_SYMBOL_GPL(nft_meta_set_dump);

static struct nft_expr_type nft_meta_type;
static const struct nft_expr_ops nft_meta_get_ops = {
	.type		= &nft_meta_type,
	.size		= NFT_EXPR_SIZE(sizeof(struct nft_meta)),
	.eval		= nft_meta_get_eval,
	.init		= nft_meta_get_init,
	.dump		= nft_meta_get_dump,
};

static const struct nft_expr_ops nft_meta_set_ops = {
	.type		= &nft_meta_type,
	.size		= NFT_EXPR_SIZE(sizeof(struct nft_meta)),
	.eval		= nft_meta_set_eval,
	.init		= nft_meta_set_init,
	.dump		= nft_meta_set_dump,
};

static const struct nft_expr_ops *
nft_meta_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_get_ops;

	if (tb[NFTA_META_SREG])
		return &nft_meta_set_ops;

	return ERR_PTR(-EINVAL);
}

static struct nft_expr_type nft_meta_type __read_mostly = {
	.name		= "meta",
	.select_ops	= &nft_meta_select_ops,
	.policy		= nft_meta_policy,
	.maxattr	= NFTA_META_MAX,
	.owner		= THIS_MODULE,
};

static int __init nft_meta_module_init(void)
{
	return nft_register_expr(&nft_meta_type);
}

static void __exit nft_meta_module_exit(void)
{
	nft_unregister_expr(&nft_meta_type);
}

module_init(nft_meta_module_init);
module_exit(nft_meta_module_exit);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
MODULE_ALIAS_NFT_EXPR("meta");
Commit	Line	Data
96518518	1	/*
ef1f7df9	2	* Copyright (c) 2008-2009 Patrick McHardy <kaber@trash.net>
96518518 PM	3	*
	4	* This program is free software; you can redistribute it and/or modify
	5	* it under the terms of the GNU General Public License version 2 as
	6	* published by the Free Software Foundation.
	7	*
	8	* Development of this code funded by Astaro AG (http://www.astaro.com/)
	9	*/
	10
	11	#include <linux/kernel.h>
	12	#include <linux/init.h>
	13	#include <linux/module.h>
	14	#include <linux/netlink.h>
	15	#include <linux/netfilter.h>
	16	#include <linux/netfilter/nf_tables.h>
e2a093ff AR	17	#include <linux/in.h>
	18	#include <linux/ip.h>
	19	#include <linux/ipv6.h>
afc5be30	20	#include <linux/smp.h>
96518518 PM	21	#include <net/dst.h>
	22	#include <net/sock.h>
	23	#include <net/tcp_states.h> /* for TCP_TIME_WAIT */
	24	#include <net/netfilter/nf_tables.h>
aa45660c	25	#include <net/netfilter/nft_meta.h>
96518518	26
aa45660c TB	27	void nft_meta_get_eval(const struct nft_expr *expr,
	28	struct nft_data data[NFT_REG_MAX + 1],
	29	const struct nft_pktinfo *pkt)
96518518 PM	30	{
	31	const struct nft_meta *priv = nft_expr_priv(expr);
	32	const struct sk_buff *skb = pkt->skb;
	33	const struct net_device in = pkt->in, out = pkt->out;
	34	struct nft_data *dest = &data[priv->dreg];
	35
	36	switch (priv->key) {
	37	case NFT_META_LEN:
	38	dest->data[0] = skb->len;
	39	break;
	40	case NFT_META_PROTOCOL:
	41	(__be16 )dest->data = skb->protocol;
	42	break;
124edfa9 PM	43	case NFT_META_NFPROTO:
	44	dest->data[0] = pkt->ops->pf;
	45	break;
4566bf27 PM	46	case NFT_META_L4PROTO:
	47	dest->data[0] = pkt->tprot;
	48	break;
96518518 PM	49	case NFT_META_PRIORITY:
	50	dest->data[0] = skb->priority;
	51	break;
	52	case NFT_META_MARK:
	53	dest->data[0] = skb->mark;
	54	break;
	55	case NFT_META_IIF:
	56	if (in == NULL)
	57	goto err;
	58	dest->data[0] = in->ifindex;
	59	break;
	60	case NFT_META_OIF:
	61	if (out == NULL)
	62	goto err;
	63	dest->data[0] = out->ifindex;
	64	break;
	65	case NFT_META_IIFNAME:
	66	if (in == NULL)
	67	goto err;
	68	strncpy((char *)dest->data, in->name, sizeof(dest->data));
	69	break;
	70	case NFT_META_OIFNAME:
	71	if (out == NULL)
	72	goto err;
	73	strncpy((char *)dest->data, out->name, sizeof(dest->data));
	74	break;
	75	case NFT_META_IIFTYPE:
	76	if (in == NULL)
	77	goto err;
	78	(u16 )dest->data = in->type;
	79	break;
	80	case NFT_META_OIFTYPE:
	81	if (out == NULL)
	82	goto err;
	83	(u16 )dest->data = out->type;
	84	break;
	85	case NFT_META_SKUID:
a8399231	86	if (skb->sk == NULL \|\| !sk_fullsock(skb->sk))
96518518 PM	87	goto err;
	88
	89	read_lock_bh(&skb->sk->sk_callback_lock);
	90	if (skb->sk->sk_socket == NULL \|\|
	91	skb->sk->sk_socket->file == NULL) {
	92	read_unlock_bh(&skb->sk->sk_callback_lock);
	93	goto err;
	94	}
	95
	96	dest->data[0] =
	97	from_kuid_munged(&init_user_ns,
	98	skb->sk->sk_socket->file->f_cred->fsuid);
	99	read_unlock_bh(&skb->sk->sk_callback_lock);
	100	break;
	101	case NFT_META_SKGID:
a8399231	102	if (skb->sk == NULL \|\| !sk_fullsock(skb->sk))
96518518 PM	103	goto err;
	104
	105	read_lock_bh(&skb->sk->sk_callback_lock);
	106	if (skb->sk->sk_socket == NULL \|\|
	107	skb->sk->sk_socket->file == NULL) {
	108	read_unlock_bh(&skb->sk->sk_callback_lock);
	109	goto err;
	110	}
	111	dest->data[0] =
	112	from_kgid_munged(&init_user_ns,
	113	skb->sk->sk_socket->file->f_cred->fsgid);
	114	read_unlock_bh(&skb->sk->sk_callback_lock);
	115	break;
06efbd6d	116	#ifdef CONFIG_IP_ROUTE_CLASSID
96518518 PM	117	case NFT_META_RTCLASSID: {
	118	const struct dst_entry *dst = skb_dst(skb);
	119
	120	if (dst == NULL)
	121	goto err;
	122	dest->data[0] = dst->tclassid;
	123	break;
	124	}
	125	#endif
	126	#ifdef CONFIG_NETWORK_SECMARK
	127	case NFT_META_SECMARK:
	128	dest->data[0] = skb->secmark;
	129	break;
	130	#endif
e2a093ff AR	131	case NFT_META_PKTTYPE:
	132	if (skb->pkt_type != PACKET_LOOPBACK) {
	133	dest->data[0] = skb->pkt_type;
	134	break;
	135	}
	136
	137	switch (pkt->ops->pf) {
	138	case NFPROTO_IPV4:
	139	if (ipv4_is_multicast(ip_hdr(skb)->daddr))
	140	dest->data[0] = PACKET_MULTICAST;
	141	else
	142	dest->data[0] = PACKET_BROADCAST;
	143	break;
	144	case NFPROTO_IPV6:
	145	if (ipv6_hdr(skb)->daddr.s6_addr[0] == 0xFF)
	146	dest->data[0] = PACKET_MULTICAST;
	147	else
	148	dest->data[0] = PACKET_BROADCAST;
	149	break;
	150	default:
	151	WARN_ON(1);
	152	goto err;
	153	}
	154	break;
afc5be30	155	case NFT_META_CPU:
14d14a5d	156	dest->data[0] = raw_smp_processor_id();
afc5be30	157	break;
3045d760 AR	158	case NFT_META_IIFGROUP:
	159	if (in == NULL)
	160	goto err;
	161	dest->data[0] = in->group;
	162	break;
	163	case NFT_META_OIFGROUP:
	164	if (out == NULL)
	165	goto err;
	166	dest->data[0] = out->group;
	167	break;
ce674173	168	case NFT_META_CGROUP:
c5035c77 PNA	169	if (skb->sk == NULL \|\| !sk_fullsock(skb->sk))
c5035c77 PNA	170	goto err;
ce674173 AR	171	dest->data[0] = skb->sk->sk_classid;
ce674173 AR	172	break;
96518518 PM	173	default:
	174	WARN_ON(1);
	175	goto err;
	176	}
	177	return;
	178
	179	err:
	180	data[NFT_REG_VERDICT].verdict = NFT_BREAK;
	181	}
aa45660c	182	EXPORT_SYMBOL_GPL(nft_meta_get_eval);
96518518	183
aa45660c TB	184	void nft_meta_set_eval(const struct nft_expr *expr,
	185	struct nft_data data[NFT_REG_MAX + 1],
	186	const struct nft_pktinfo *pkt)
e035b77a ABG	187	{
	188	const struct nft_meta *meta = nft_expr_priv(expr);
	189	struct sk_buff *skb = pkt->skb;
	190	u32 value = data[meta->sreg].data[0];
	191
	192	switch (meta->key) {
	193	case NFT_META_MARK:
	194	skb->mark = value;
	195	break;
	196	case NFT_META_PRIORITY:
	197	skb->priority = value;
	198	break;
	199	case NFT_META_NFTRACE:
	200	skb->nf_trace = 1;
	201	break;
	202	default:
	203	WARN_ON(1);
	204	}
	205	}
aa45660c	206	EXPORT_SYMBOL_GPL(nft_meta_set_eval);
e035b77a	207
aa45660c	208	const struct nla_policy nft_meta_policy[NFTA_META_MAX + 1] = {
96518518 PM	209	[NFTA_META_DREG] = { .type = NLA_U32 },
96518518 PM	210	[NFTA_META_KEY] = { .type = NLA_U32 },
e035b77a	211	[NFTA_META_SREG] = { .type = NLA_U32 },
96518518	212	};
aa45660c	213	EXPORT_SYMBOL_GPL(nft_meta_policy);
96518518	214
aa45660c TB	215	int nft_meta_get_init(const struct nft_ctx *ctx,
	216	const struct nft_expr *expr,
	217	const struct nlattr * const tb[])
96518518	218	{
d2caa696	219	struct nft_meta *priv = nft_expr_priv(expr);
45d9bcda	220	unsigned int len;
96518518	221
d2caa696 PM	222	priv->key = ntohl(nla_get_be32(tb[NFTA_META_KEY]));
d2caa696 PM	223	switch (priv->key) {
96518518	224	case NFT_META_PROTOCOL:
45d9bcda PM	225	case NFT_META_IIFTYPE:
	226	case NFT_META_OIFTYPE:
	227	len = sizeof(u16);
	228	break;
124edfa9	229	case NFT_META_NFPROTO:
4566bf27	230	case NFT_META_L4PROTO:
45d9bcda	231	case NFT_META_LEN:
96518518 PM	232	case NFT_META_PRIORITY:
	233	case NFT_META_MARK:
	234	case NFT_META_IIF:
	235	case NFT_META_OIF:
96518518 PM	236	case NFT_META_SKUID:
96518518 PM	237	case NFT_META_SKGID:
06efbd6d	238	#ifdef CONFIG_IP_ROUTE_CLASSID
96518518 PM	239	case NFT_META_RTCLASSID:
	240	#endif
	241	#ifdef CONFIG_NETWORK_SECMARK
	242	case NFT_META_SECMARK:
	243	#endif
e2a093ff	244	case NFT_META_PKTTYPE:
afc5be30	245	case NFT_META_CPU:
3045d760 AR	246	case NFT_META_IIFGROUP:
3045d760 AR	247	case NFT_META_OIFGROUP:
ce674173	248	case NFT_META_CGROUP:
45d9bcda PM	249	len = sizeof(u32);
	250	break;
	251	case NFT_META_IIFNAME:
	252	case NFT_META_OIFNAME:
	253	len = IFNAMSIZ;
d2caa696	254	break;
96518518 PM	255	default:
	256	return -EOPNOTSUPP;
	257	}
	258
d2caa696	259	priv->dreg = ntohl(nla_get_be32(tb[NFTA_META_DREG]));
27e6d201 PM	260	return nft_validate_register_store(ctx, priv->dreg, NULL,
27e6d201 PM	261	NFT_DATA_VALUE, len);
e035b77a	262	}
aa45660c	263	EXPORT_SYMBOL_GPL(nft_meta_get_init);
e035b77a	264
aa45660c TB	265	int nft_meta_set_init(const struct nft_ctx *ctx,
	266	const struct nft_expr *expr,
	267	const struct nlattr * const tb[])
e035b77a ABG	268	{
e035b77a ABG	269	struct nft_meta *priv = nft_expr_priv(expr);
d07db988	270	unsigned int len;
e035b77a ABG	271	int err;
	272
	273	priv->key = ntohl(nla_get_be32(tb[NFTA_META_KEY]));
d2caa696 PM	274	switch (priv->key) {
	275	case NFT_META_MARK:
	276	case NFT_META_PRIORITY:
d07db988 PM	277	len = sizeof(u32);
d07db988 PM	278	break;
d2caa696	279	case NFT_META_NFTRACE:
d07db988	280	len = sizeof(u8);
d2caa696 PM	281	break;
	282	default:
	283	return -EOPNOTSUPP;
e035b77a ABG	284	}
e035b77a ABG	285
e035b77a	286	priv->sreg = ntohl(nla_get_be32(tb[NFTA_META_SREG]));
d07db988	287	err = nft_validate_register_load(priv->sreg, len);
b38895c5 PNA	288	if (err < 0)
b38895c5 PNA	289	return err;
e035b77a ABG	290
e035b77a ABG	291	return 0;
96518518	292	}
aa45660c	293	EXPORT_SYMBOL_GPL(nft_meta_set_init);
96518518	294
aa45660c TB	295	int nft_meta_get_dump(struct sk_buff *skb,
aa45660c TB	296	const struct nft_expr *expr)
96518518 PM	297	{
	298	const struct nft_meta *priv = nft_expr_priv(expr);
	299
e035b77a ABG	300	if (nla_put_be32(skb, NFTA_META_KEY, htonl(priv->key)))
e035b77a ABG	301	goto nla_put_failure;
96518518 PM	302	if (nla_put_be32(skb, NFTA_META_DREG, htonl(priv->dreg)))
96518518 PM	303	goto nla_put_failure;
e035b77a ABG	304	return 0;
	305
	306	nla_put_failure:
	307	return -1;
	308	}
aa45660c	309	EXPORT_SYMBOL_GPL(nft_meta_get_dump);
e035b77a	310
aa45660c TB	311	int nft_meta_set_dump(struct sk_buff *skb,
aa45660c TB	312	const struct nft_expr *expr)
e035b77a ABG	313	{
	314	const struct nft_meta *priv = nft_expr_priv(expr);
	315
96518518 PM	316	if (nla_put_be32(skb, NFTA_META_KEY, htonl(priv->key)))
96518518 PM	317	goto nla_put_failure;
e035b77a ABG	318	if (nla_put_be32(skb, NFTA_META_SREG, htonl(priv->sreg)))
	319	goto nla_put_failure;
	320
96518518 PM	321	return 0;
	322
	323	nla_put_failure:
	324	return -1;
	325	}
aa45660c	326	EXPORT_SYMBOL_GPL(nft_meta_set_dump);
96518518	327
ef1f7df9	328	static struct nft_expr_type nft_meta_type;
e035b77a	329	static const struct nft_expr_ops nft_meta_get_ops = {
ef1f7df9	330	.type = &nft_meta_type,
96518518	331	.size = NFT_EXPR_SIZE(sizeof(struct nft_meta)),
e035b77a	332	.eval = nft_meta_get_eval,
d2caa696	333	.init = nft_meta_get_init,
e035b77a	334	.dump = nft_meta_get_dump,
ef1f7df9 PM	335	};
ef1f7df9 PM	336
e035b77a ABG	337	static const struct nft_expr_ops nft_meta_set_ops = {
	338	.type = &nft_meta_type,
	339	.size = NFT_EXPR_SIZE(sizeof(struct nft_meta)),
	340	.eval = nft_meta_set_eval,
d2caa696	341	.init = nft_meta_set_init,
e035b77a ABG	342	.dump = nft_meta_set_dump,
	343	};
	344
	345	static const struct nft_expr_ops *
	346	nft_meta_select_ops(const struct nft_ctx *ctx,
	347	const struct nlattr * const tb[])
	348	{
	349	if (tb[NFTA_META_KEY] == NULL)
	350	return ERR_PTR(-EINVAL);
	351
	352	if (tb[NFTA_META_DREG] && tb[NFTA_META_SREG])
	353	return ERR_PTR(-EINVAL);
	354
	355	if (tb[NFTA_META_DREG])
	356	return &nft_meta_get_ops;
	357
	358	if (tb[NFTA_META_SREG])
	359	return &nft_meta_set_ops;
	360
	361	return ERR_PTR(-EINVAL);
	362	}
	363
ef1f7df9 PM	364	static struct nft_expr_type nft_meta_type __read_mostly = {
ef1f7df9 PM	365	.name = "meta",
e035b77a	366	.select_ops = &nft_meta_select_ops,
96518518 PM	367	.policy = nft_meta_policy,
96518518 PM	368	.maxattr = NFTA_META_MAX,
ef1f7df9	369	.owner = THIS_MODULE,
96518518 PM	370	};
	371
	372	static int __init nft_meta_module_init(void)
	373	{
ef1f7df9	374	return nft_register_expr(&nft_meta_type);
96518518 PM	375	}
	376
	377	static void __exit nft_meta_module_exit(void)
	378	{
ef1f7df9	379	nft_unregister_expr(&nft_meta_type);
96518518 PM	380	}
	381
	382	module_init(nft_meta_module_init);
	383	module_exit(nft_meta_module_exit);
	384
	385	MODULE_LICENSE("GPL");
	386	MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
	387	MODULE_ALIAS_NFT_EXPR("meta");