[deliverable/linux.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_regs *regs,
		       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;
	u32 *dest = &regs->data[priv->dreg].data[0];

	switch (priv->key) {
	case NFT_META_LEN:
		*dest = skb->len;
		break;
	case NFT_META_PROTOCOL:
		*(__be16 *)dest = skb->protocol;
		break;
	case NFT_META_NFPROTO:
		*dest = pkt->ops->pf;
		break;
	case NFT_META_L4PROTO:
		*dest = pkt->tprot;
		break;
	case NFT_META_PRIORITY:
		*dest = skb->priority;
		break;
	case NFT_META_MARK:
		*dest = skb->mark;
		break;
	case NFT_META_IIF:
		if (in == NULL)
			goto err;
		*dest = in->ifindex;
		break;
	case NFT_META_OIF:
		if (out == NULL)
			goto err;
		*dest = out->ifindex;
		break;
	case NFT_META_IIFNAME:
		if (in == NULL)
			goto err;
		strncpy((char *)dest, in->name, IFNAMSIZ);
		break;
	case NFT_META_OIFNAME:
		if (out == NULL)
			goto err;
		strncpy((char *)dest, out->name, IFNAMSIZ);
		break;
	case NFT_META_IIFTYPE:
		if (in == NULL)
			goto err;
		*(u16 *)dest = in->type;
		break;
	case NFT_META_OIFTYPE:
		if (out == NULL)
			goto err;
		*(u16 *)dest = 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 =	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 =	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 = dst->tclassid;
		break;
	}
#endif
#ifdef CONFIG_NETWORK_SECMARK
	case NFT_META_SECMARK:
		*dest = skb->secmark;
		break;
#endif
	case NFT_META_PKTTYPE:
		if (skb->pkt_type != PACKET_LOOPBACK) {
			*dest = skb->pkt_type;
			break;
		}

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

err:
	regs->verdict.code = NFT_BREAK;
}
EXPORT_SYMBOL_GPL(nft_meta_get_eval);

void nft_meta_set_eval(const struct nft_expr *expr,
		       struct nft_regs *regs,
		       const struct nft_pktinfo *pkt)
{
	const struct nft_meta *meta = nft_expr_priv(expr);
	struct sk_buff *skb = pkt->skb;
	u32 value = regs->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	27	void nft_meta_get_eval(const struct nft_expr *expr,
a55e22e9	28	struct nft_regs *regs,
aa45660c	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;
fad136ea	34	u32 *dest = &regs->data[priv->dreg].data[0];
96518518 PM	35
	36	switch (priv->key) {
	37	case NFT_META_LEN:
fad136ea	38	*dest = skb->len;
96518518 PM	39	break;
96518518 PM	40	case NFT_META_PROTOCOL:
fad136ea	41	(__be16 )dest = skb->protocol;
96518518	42	break;
124edfa9	43	case NFT_META_NFPROTO:
fad136ea	44	*dest = pkt->ops->pf;
124edfa9	45	break;
4566bf27	46	case NFT_META_L4PROTO:
fad136ea	47	*dest = pkt->tprot;
4566bf27	48	break;
96518518	49	case NFT_META_PRIORITY:
fad136ea	50	*dest = skb->priority;
96518518 PM	51	break;
96518518 PM	52	case NFT_META_MARK:
fad136ea	53	*dest = skb->mark;
96518518 PM	54	break;
	55	case NFT_META_IIF:
	56	if (in == NULL)
	57	goto err;
fad136ea	58	*dest = in->ifindex;
96518518 PM	59	break;
	60	case NFT_META_OIF:
	61	if (out == NULL)
	62	goto err;
fad136ea	63	*dest = out->ifindex;
96518518 PM	64	break;
	65	case NFT_META_IIFNAME:
	66	if (in == NULL)
	67	goto err;
fad136ea	68	strncpy((char *)dest, in->name, IFNAMSIZ);
96518518 PM	69	break;
	70	case NFT_META_OIFNAME:
	71	if (out == NULL)
	72	goto err;
fad136ea	73	strncpy((char *)dest, out->name, IFNAMSIZ);
96518518 PM	74	break;
	75	case NFT_META_IIFTYPE:
	76	if (in == NULL)
	77	goto err;
fad136ea	78	(u16 )dest = in->type;
96518518 PM	79	break;
	80	case NFT_META_OIFTYPE:
	81	if (out == NULL)
	82	goto err;
fad136ea	83	(u16 )dest = out->type;
96518518 PM	84	break;
96518518 PM	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
fad136ea	96	*dest = from_kuid_munged(&init_user_ns,
96518518 PM	97	skb->sk->sk_socket->file->f_cred->fsuid);
	98	read_unlock_bh(&skb->sk->sk_callback_lock);
	99	break;
	100	case NFT_META_SKGID:
a8399231	101	if (skb->sk == NULL \|\| !sk_fullsock(skb->sk))
96518518 PM	102	goto err;
	103
	104	read_lock_bh(&skb->sk->sk_callback_lock);
	105	if (skb->sk->sk_socket == NULL \|\|
	106	skb->sk->sk_socket->file == NULL) {
	107	read_unlock_bh(&skb->sk->sk_callback_lock);
	108	goto err;
	109	}
fad136ea	110	*dest = from_kgid_munged(&init_user_ns,
96518518 PM	111	skb->sk->sk_socket->file->f_cred->fsgid);
	112	read_unlock_bh(&skb->sk->sk_callback_lock);
	113	break;
06efbd6d	114	#ifdef CONFIG_IP_ROUTE_CLASSID
96518518 PM	115	case NFT_META_RTCLASSID: {
	116	const struct dst_entry *dst = skb_dst(skb);
	117
	118	if (dst == NULL)
	119	goto err;
fad136ea	120	*dest = dst->tclassid;
96518518 PM	121	break;
	122	}
	123	#endif
	124	#ifdef CONFIG_NETWORK_SECMARK
	125	case NFT_META_SECMARK:
fad136ea	126	*dest = skb->secmark;
96518518 PM	127	break;
96518518 PM	128	#endif
e2a093ff AR	129	case NFT_META_PKTTYPE:
e2a093ff AR	130	if (skb->pkt_type != PACKET_LOOPBACK) {
fad136ea	131	*dest = skb->pkt_type;
e2a093ff AR	132	break;
	133	}
	134
	135	switch (pkt->ops->pf) {
	136	case NFPROTO_IPV4:
	137	if (ipv4_is_multicast(ip_hdr(skb)->daddr))
fad136ea	138	*dest = PACKET_MULTICAST;
e2a093ff	139	else
fad136ea	140	*dest = PACKET_BROADCAST;
e2a093ff AR	141	break;
	142	case NFPROTO_IPV6:
	143	if (ipv6_hdr(skb)->daddr.s6_addr[0] == 0xFF)
fad136ea	144	*dest = PACKET_MULTICAST;
e2a093ff	145	else
fad136ea	146	*dest = PACKET_BROADCAST;
e2a093ff AR	147	break;
	148	default:
	149	WARN_ON(1);
	150	goto err;
	151	}
	152	break;
afc5be30	153	case NFT_META_CPU:
fad136ea	154	*dest = raw_smp_processor_id();
afc5be30	155	break;
3045d760 AR	156	case NFT_META_IIFGROUP:
	157	if (in == NULL)
	158	goto err;
fad136ea	159	*dest = in->group;
3045d760 AR	160	break;
	161	case NFT_META_OIFGROUP:
	162	if (out == NULL)
	163	goto err;
fad136ea	164	*dest = out->group;
3045d760	165	break;
ce674173	166	case NFT_META_CGROUP:
c5035c77 PNA	167	if (skb->sk == NULL \|\| !sk_fullsock(skb->sk))
c5035c77 PNA	168	goto err;
fad136ea	169	*dest = skb->sk->sk_classid;
ce674173	170	break;
96518518 PM	171	default:
	172	WARN_ON(1);
	173	goto err;
	174	}
	175	return;
	176
	177	err:
a55e22e9	178	regs->verdict.code = NFT_BREAK;
96518518	179	}
aa45660c	180	EXPORT_SYMBOL_GPL(nft_meta_get_eval);
96518518	181
aa45660c	182	void nft_meta_set_eval(const struct nft_expr *expr,
a55e22e9	183	struct nft_regs *regs,
aa45660c	184	const struct nft_pktinfo *pkt)
e035b77a ABG	185	{
	186	const struct nft_meta *meta = nft_expr_priv(expr);
	187	struct sk_buff *skb = pkt->skb;
a55e22e9	188	u32 value = regs->data[meta->sreg].data[0];
e035b77a ABG	189
	190	switch (meta->key) {
	191	case NFT_META_MARK:
	192	skb->mark = value;
	193	break;
	194	case NFT_META_PRIORITY:
	195	skb->priority = value;
	196	break;
	197	case NFT_META_NFTRACE:
	198	skb->nf_trace = 1;
	199	break;
	200	default:
	201	WARN_ON(1);
	202	}
	203	}
aa45660c	204	EXPORT_SYMBOL_GPL(nft_meta_set_eval);
e035b77a	205
aa45660c	206	const struct nla_policy nft_meta_policy[NFTA_META_MAX + 1] = {
96518518 PM	207	[NFTA_META_DREG] = { .type = NLA_U32 },
96518518 PM	208	[NFTA_META_KEY] = { .type = NLA_U32 },
e035b77a	209	[NFTA_META_SREG] = { .type = NLA_U32 },
96518518	210	};
aa45660c	211	EXPORT_SYMBOL_GPL(nft_meta_policy);
96518518	212
aa45660c TB	213	int nft_meta_get_init(const struct nft_ctx *ctx,
	214	const struct nft_expr *expr,
	215	const struct nlattr * const tb[])
96518518	216	{
d2caa696	217	struct nft_meta *priv = nft_expr_priv(expr);
45d9bcda	218	unsigned int len;
96518518	219
d2caa696 PM	220	priv->key = ntohl(nla_get_be32(tb[NFTA_META_KEY]));
d2caa696 PM	221	switch (priv->key) {
96518518	222	case NFT_META_PROTOCOL:
45d9bcda PM	223	case NFT_META_IIFTYPE:
	224	case NFT_META_OIFTYPE:
	225	len = sizeof(u16);
	226	break;
124edfa9	227	case NFT_META_NFPROTO:
4566bf27	228	case NFT_META_L4PROTO:
45d9bcda	229	case NFT_META_LEN:
96518518 PM	230	case NFT_META_PRIORITY:
	231	case NFT_META_MARK:
	232	case NFT_META_IIF:
	233	case NFT_META_OIF:
96518518 PM	234	case NFT_META_SKUID:
96518518 PM	235	case NFT_META_SKGID:
06efbd6d	236	#ifdef CONFIG_IP_ROUTE_CLASSID
96518518 PM	237	case NFT_META_RTCLASSID:
	238	#endif
	239	#ifdef CONFIG_NETWORK_SECMARK
	240	case NFT_META_SECMARK:
	241	#endif
e2a093ff	242	case NFT_META_PKTTYPE:
afc5be30	243	case NFT_META_CPU:
3045d760 AR	244	case NFT_META_IIFGROUP:
3045d760 AR	245	case NFT_META_OIFGROUP:
ce674173	246	case NFT_META_CGROUP:
45d9bcda PM	247	len = sizeof(u32);
	248	break;
	249	case NFT_META_IIFNAME:
	250	case NFT_META_OIFNAME:
	251	len = IFNAMSIZ;
d2caa696	252	break;
96518518 PM	253	default:
	254	return -EOPNOTSUPP;
	255	}
	256
d2caa696	257	priv->dreg = ntohl(nla_get_be32(tb[NFTA_META_DREG]));
27e6d201 PM	258	return nft_validate_register_store(ctx, priv->dreg, NULL,
27e6d201 PM	259	NFT_DATA_VALUE, len);
e035b77a	260	}
aa45660c	261	EXPORT_SYMBOL_GPL(nft_meta_get_init);
e035b77a	262
aa45660c TB	263	int nft_meta_set_init(const struct nft_ctx *ctx,
	264	const struct nft_expr *expr,
	265	const struct nlattr * const tb[])
e035b77a ABG	266	{
e035b77a ABG	267	struct nft_meta *priv = nft_expr_priv(expr);
d07db988	268	unsigned int len;
e035b77a ABG	269	int err;
	270
	271	priv->key = ntohl(nla_get_be32(tb[NFTA_META_KEY]));
d2caa696 PM	272	switch (priv->key) {
	273	case NFT_META_MARK:
	274	case NFT_META_PRIORITY:
d07db988 PM	275	len = sizeof(u32);
d07db988 PM	276	break;
d2caa696	277	case NFT_META_NFTRACE:
d07db988	278	len = sizeof(u8);
d2caa696 PM	279	break;
	280	default:
	281	return -EOPNOTSUPP;
e035b77a ABG	282	}
e035b77a ABG	283
e035b77a	284	priv->sreg = ntohl(nla_get_be32(tb[NFTA_META_SREG]));
d07db988	285	err = nft_validate_register_load(priv->sreg, len);
b38895c5 PNA	286	if (err < 0)
b38895c5 PNA	287	return err;
e035b77a ABG	288
e035b77a ABG	289	return 0;
96518518	290	}
aa45660c	291	EXPORT_SYMBOL_GPL(nft_meta_set_init);
96518518	292
aa45660c TB	293	int nft_meta_get_dump(struct sk_buff *skb,
aa45660c TB	294	const struct nft_expr *expr)
96518518 PM	295	{
	296	const struct nft_meta *priv = nft_expr_priv(expr);
	297
e035b77a ABG	298	if (nla_put_be32(skb, NFTA_META_KEY, htonl(priv->key)))
e035b77a ABG	299	goto nla_put_failure;
96518518 PM	300	if (nla_put_be32(skb, NFTA_META_DREG, htonl(priv->dreg)))
96518518 PM	301	goto nla_put_failure;
e035b77a ABG	302	return 0;
	303
	304	nla_put_failure:
	305	return -1;
	306	}
aa45660c	307	EXPORT_SYMBOL_GPL(nft_meta_get_dump);
e035b77a	308
aa45660c TB	309	int nft_meta_set_dump(struct sk_buff *skb,
aa45660c TB	310	const struct nft_expr *expr)
e035b77a ABG	311	{
	312	const struct nft_meta *priv = nft_expr_priv(expr);
	313
96518518 PM	314	if (nla_put_be32(skb, NFTA_META_KEY, htonl(priv->key)))
96518518 PM	315	goto nla_put_failure;
e035b77a ABG	316	if (nla_put_be32(skb, NFTA_META_SREG, htonl(priv->sreg)))
	317	goto nla_put_failure;
	318
96518518 PM	319	return 0;
	320
	321	nla_put_failure:
	322	return -1;
	323	}
aa45660c	324	EXPORT_SYMBOL_GPL(nft_meta_set_dump);
96518518	325
ef1f7df9	326	static struct nft_expr_type nft_meta_type;
e035b77a	327	static const struct nft_expr_ops nft_meta_get_ops = {
ef1f7df9	328	.type = &nft_meta_type,
96518518	329	.size = NFT_EXPR_SIZE(sizeof(struct nft_meta)),
e035b77a	330	.eval = nft_meta_get_eval,
d2caa696	331	.init = nft_meta_get_init,
e035b77a	332	.dump = nft_meta_get_dump,
ef1f7df9 PM	333	};
ef1f7df9 PM	334
e035b77a ABG	335	static const struct nft_expr_ops nft_meta_set_ops = {
	336	.type = &nft_meta_type,
	337	.size = NFT_EXPR_SIZE(sizeof(struct nft_meta)),
	338	.eval = nft_meta_set_eval,
d2caa696	339	.init = nft_meta_set_init,
e035b77a ABG	340	.dump = nft_meta_set_dump,
	341	};
	342
	343	static const struct nft_expr_ops *
	344	nft_meta_select_ops(const struct nft_ctx *ctx,
	345	const struct nlattr * const tb[])
	346	{
	347	if (tb[NFTA_META_KEY] == NULL)
	348	return ERR_PTR(-EINVAL);
	349
	350	if (tb[NFTA_META_DREG] && tb[NFTA_META_SREG])
	351	return ERR_PTR(-EINVAL);
	352
	353	if (tb[NFTA_META_DREG])
	354	return &nft_meta_get_ops;
	355
	356	if (tb[NFTA_META_SREG])
	357	return &nft_meta_set_ops;
	358
	359	return ERR_PTR(-EINVAL);
	360	}
	361
ef1f7df9 PM	362	static struct nft_expr_type nft_meta_type __read_mostly = {
ef1f7df9 PM	363	.name = "meta",
e035b77a	364	.select_ops = &nft_meta_select_ops,
96518518 PM	365	.policy = nft_meta_policy,
96518518 PM	366	.maxattr = NFTA_META_MAX,
ef1f7df9	367	.owner = THIS_MODULE,
96518518 PM	368	};
	369
	370	static int __init nft_meta_module_init(void)
	371	{
ef1f7df9	372	return nft_register_expr(&nft_meta_type);
96518518 PM	373	}
	374
	375	static void __exit nft_meta_module_exit(void)
	376	{
ef1f7df9	377	nft_unregister_expr(&nft_meta_type);
96518518 PM	378	}
	379
	380	module_init(nft_meta_module_init);
	381	module_exit(nft_meta_module_exit);
	382
	383	MODULE_LICENSE("GPL");
	384	MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
	385	MODULE_ALIAS_NFT_EXPR("meta");