[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];

	switch (priv->key) {
	case NFT_META_LEN:
		*dest = skb->len;
		break;
	case NFT_META_PROTOCOL:
		*dest = 0;
		*(__be16 *)dest = skb->protocol;
		break;
	case NFT_META_NFPROTO:
		*dest = pkt->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;
		*dest = 0;
		*(u16 *)dest = in->type;
		break;
	case NFT_META_OIFTYPE:
		if (out == NULL)
			goto err;
		*dest = 0;
		*(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->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;
#ifdef CONFIG_CGROUP_NET_CLASSID
	case NFT_META_CGROUP:
		if (skb->sk == NULL || !sk_fullsock(skb->sk))
			goto err;
		*dest = skb->sk->sk_classid;
		break;
#endif
	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];

	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:
#ifdef CONFIG_CGROUP_NET_CLASSID
	case NFT_META_CGROUP:
#endif
		len = sizeof(u32);
		break;
	case NFT_META_IIFNAME:
	case NFT_META_OIFNAME:
		len = IFNAMSIZ;
		break;
	default:
		return -EOPNOTSUPP;
	}

	priv->dreg = nft_parse_register(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 = nft_parse_register(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 (nft_dump_register(skb, NFTA_META_DREG, 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 (nft_dump_register(skb, NFTA_META_SREG, 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;
49499c3e	34	u32 *dest = &regs->data[priv->dreg];
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:
49499c3e	41	*dest = 0;
fad136ea	42	(__be16 )dest = skb->protocol;
96518518	43	break;
124edfa9	44	case NFT_META_NFPROTO:
6aa187f2	45	*dest = pkt->pf;
124edfa9	46	break;
4566bf27	47	case NFT_META_L4PROTO:
fad136ea	48	*dest = pkt->tprot;
4566bf27	49	break;
96518518	50	case NFT_META_PRIORITY:
fad136ea	51	*dest = skb->priority;
96518518 PM	52	break;
96518518 PM	53	case NFT_META_MARK:
fad136ea	54	*dest = skb->mark;
96518518 PM	55	break;
	56	case NFT_META_IIF:
	57	if (in == NULL)
	58	goto err;
fad136ea	59	*dest = in->ifindex;
96518518 PM	60	break;
	61	case NFT_META_OIF:
	62	if (out == NULL)
	63	goto err;
fad136ea	64	*dest = out->ifindex;
96518518 PM	65	break;
	66	case NFT_META_IIFNAME:
	67	if (in == NULL)
	68	goto err;
fad136ea	69	strncpy((char *)dest, in->name, IFNAMSIZ);
96518518 PM	70	break;
	71	case NFT_META_OIFNAME:
	72	if (out == NULL)
	73	goto err;
fad136ea	74	strncpy((char *)dest, out->name, IFNAMSIZ);
96518518 PM	75	break;
	76	case NFT_META_IIFTYPE:
	77	if (in == NULL)
	78	goto err;
49499c3e	79	*dest = 0;
fad136ea	80	(u16 )dest = in->type;
96518518 PM	81	break;
	82	case NFT_META_OIFTYPE:
	83	if (out == NULL)
	84	goto err;
49499c3e	85	*dest = 0;
fad136ea	86	(u16 )dest = out->type;
96518518 PM	87	break;
96518518 PM	88	case NFT_META_SKUID:
a8399231	89	if (skb->sk == NULL \|\| !sk_fullsock(skb->sk))
96518518 PM	90	goto err;
	91
	92	read_lock_bh(&skb->sk->sk_callback_lock);
	93	if (skb->sk->sk_socket == NULL \|\|
	94	skb->sk->sk_socket->file == NULL) {
	95	read_unlock_bh(&skb->sk->sk_callback_lock);
	96	goto err;
	97	}
	98
fad136ea	99	*dest = from_kuid_munged(&init_user_ns,
96518518 PM	100	skb->sk->sk_socket->file->f_cred->fsuid);
	101	read_unlock_bh(&skb->sk->sk_callback_lock);
	102	break;
	103	case NFT_META_SKGID:
a8399231	104	if (skb->sk == NULL \|\| !sk_fullsock(skb->sk))
96518518 PM	105	goto err;
	106
	107	read_lock_bh(&skb->sk->sk_callback_lock);
	108	if (skb->sk->sk_socket == NULL \|\|
	109	skb->sk->sk_socket->file == NULL) {
	110	read_unlock_bh(&skb->sk->sk_callback_lock);
	111	goto err;
	112	}
fad136ea	113	*dest = from_kgid_munged(&init_user_ns,
96518518 PM	114	skb->sk->sk_socket->file->f_cred->fsgid);
	115	read_unlock_bh(&skb->sk->sk_callback_lock);
	116	break;
06efbd6d	117	#ifdef CONFIG_IP_ROUTE_CLASSID
96518518 PM	118	case NFT_META_RTCLASSID: {
	119	const struct dst_entry *dst = skb_dst(skb);
	120
	121	if (dst == NULL)
	122	goto err;
fad136ea	123	*dest = dst->tclassid;
96518518 PM	124	break;
	125	}
	126	#endif
	127	#ifdef CONFIG_NETWORK_SECMARK
	128	case NFT_META_SECMARK:
fad136ea	129	*dest = skb->secmark;
96518518 PM	130	break;
96518518 PM	131	#endif
e2a093ff AR	132	case NFT_META_PKTTYPE:
e2a093ff AR	133	if (skb->pkt_type != PACKET_LOOPBACK) {
fad136ea	134	*dest = skb->pkt_type;
e2a093ff AR	135	break;
	136	}
	137
6aa187f2	138	switch (pkt->pf) {
e2a093ff AR	139	case NFPROTO_IPV4:
e2a093ff AR	140	if (ipv4_is_multicast(ip_hdr(skb)->daddr))
fad136ea	141	*dest = PACKET_MULTICAST;
e2a093ff	142	else
fad136ea	143	*dest = PACKET_BROADCAST;
e2a093ff AR	144	break;
	145	case NFPROTO_IPV6:
	146	if (ipv6_hdr(skb)->daddr.s6_addr[0] == 0xFF)
fad136ea	147	*dest = PACKET_MULTICAST;
e2a093ff	148	else
fad136ea	149	*dest = PACKET_BROADCAST;
e2a093ff AR	150	break;
	151	default:
	152	WARN_ON(1);
	153	goto err;
	154	}
	155	break;
afc5be30	156	case NFT_META_CPU:
fad136ea	157	*dest = raw_smp_processor_id();
afc5be30	158	break;
3045d760 AR	159	case NFT_META_IIFGROUP:
	160	if (in == NULL)
	161	goto err;
fad136ea	162	*dest = in->group;
3045d760 AR	163	break;
	164	case NFT_META_OIFGROUP:
	165	if (out == NULL)
	166	goto err;
fad136ea	167	*dest = out->group;
3045d760	168	break;
e181a543	169	#ifdef CONFIG_CGROUP_NET_CLASSID
ce674173	170	case NFT_META_CGROUP:
c5035c77 PNA	171	if (skb->sk == NULL \|\| !sk_fullsock(skb->sk))
c5035c77 PNA	172	goto err;
fad136ea	173	*dest = skb->sk->sk_classid;
ce674173	174	break;
e181a543	175	#endif
96518518 PM	176	default:
	177	WARN_ON(1);
	178	goto err;
	179	}
	180	return;
	181
	182	err:
a55e22e9	183	regs->verdict.code = NFT_BREAK;
96518518	184	}
aa45660c	185	EXPORT_SYMBOL_GPL(nft_meta_get_eval);
96518518	186
aa45660c	187	void nft_meta_set_eval(const struct nft_expr *expr,
a55e22e9	188	struct nft_regs *regs,
aa45660c	189	const struct nft_pktinfo *pkt)
e035b77a ABG	190	{
	191	const struct nft_meta *meta = nft_expr_priv(expr);
	192	struct sk_buff *skb = pkt->skb;
49499c3e	193	u32 value = regs->data[meta->sreg];
e035b77a ABG	194
	195	switch (meta->key) {
	196	case NFT_META_MARK:
	197	skb->mark = value;
	198	break;
	199	case NFT_META_PRIORITY:
	200	skb->priority = value;
	201	break;
	202	case NFT_META_NFTRACE:
	203	skb->nf_trace = 1;
	204	break;
	205	default:
	206	WARN_ON(1);
	207	}
	208	}
aa45660c	209	EXPORT_SYMBOL_GPL(nft_meta_set_eval);
e035b77a	210
aa45660c	211	const struct nla_policy nft_meta_policy[NFTA_META_MAX + 1] = {
96518518 PM	212	[NFTA_META_DREG] = { .type = NLA_U32 },
96518518 PM	213	[NFTA_META_KEY] = { .type = NLA_U32 },
e035b77a	214	[NFTA_META_SREG] = { .type = NLA_U32 },
96518518	215	};
aa45660c	216	EXPORT_SYMBOL_GPL(nft_meta_policy);
96518518	217
aa45660c TB	218	int nft_meta_get_init(const struct nft_ctx *ctx,
	219	const struct nft_expr *expr,
	220	const struct nlattr * const tb[])
96518518	221	{
d2caa696	222	struct nft_meta *priv = nft_expr_priv(expr);
45d9bcda	223	unsigned int len;
96518518	224
d2caa696 PM	225	priv->key = ntohl(nla_get_be32(tb[NFTA_META_KEY]));
d2caa696 PM	226	switch (priv->key) {
96518518	227	case NFT_META_PROTOCOL:
45d9bcda PM	228	case NFT_META_IIFTYPE:
	229	case NFT_META_OIFTYPE:
	230	len = sizeof(u16);
	231	break;
124edfa9	232	case NFT_META_NFPROTO:
4566bf27	233	case NFT_META_L4PROTO:
45d9bcda	234	case NFT_META_LEN:
96518518 PM	235	case NFT_META_PRIORITY:
	236	case NFT_META_MARK:
	237	case NFT_META_IIF:
	238	case NFT_META_OIF:
96518518 PM	239	case NFT_META_SKUID:
96518518 PM	240	case NFT_META_SKGID:
06efbd6d	241	#ifdef CONFIG_IP_ROUTE_CLASSID
96518518 PM	242	case NFT_META_RTCLASSID:
	243	#endif
	244	#ifdef CONFIG_NETWORK_SECMARK
	245	case NFT_META_SECMARK:
	246	#endif
e2a093ff	247	case NFT_META_PKTTYPE:
afc5be30	248	case NFT_META_CPU:
3045d760 AR	249	case NFT_META_IIFGROUP:
3045d760 AR	250	case NFT_META_OIFGROUP:
e181a543	251	#ifdef CONFIG_CGROUP_NET_CLASSID
ce674173	252	case NFT_META_CGROUP:
e181a543	253	#endif
45d9bcda PM	254	len = sizeof(u32);
	255	break;
	256	case NFT_META_IIFNAME:
	257	case NFT_META_OIFNAME:
	258	len = IFNAMSIZ;
d2caa696	259	break;
96518518 PM	260	default:
	261	return -EOPNOTSUPP;
	262	}
	263
b1c96ed3	264	priv->dreg = nft_parse_register(tb[NFTA_META_DREG]);
27e6d201 PM	265	return nft_validate_register_store(ctx, priv->dreg, NULL,
27e6d201 PM	266	NFT_DATA_VALUE, len);
e035b77a	267	}
aa45660c	268	EXPORT_SYMBOL_GPL(nft_meta_get_init);
e035b77a	269
aa45660c TB	270	int nft_meta_set_init(const struct nft_ctx *ctx,
	271	const struct nft_expr *expr,
	272	const struct nlattr * const tb[])
e035b77a ABG	273	{
e035b77a ABG	274	struct nft_meta *priv = nft_expr_priv(expr);
d07db988	275	unsigned int len;
e035b77a ABG	276	int err;
	277
	278	priv->key = ntohl(nla_get_be32(tb[NFTA_META_KEY]));
d2caa696 PM	279	switch (priv->key) {
	280	case NFT_META_MARK:
	281	case NFT_META_PRIORITY:
d07db988 PM	282	len = sizeof(u32);
d07db988 PM	283	break;
d2caa696	284	case NFT_META_NFTRACE:
d07db988	285	len = sizeof(u8);
d2caa696 PM	286	break;
	287	default:
	288	return -EOPNOTSUPP;
e035b77a ABG	289	}
e035b77a ABG	290
b1c96ed3	291	priv->sreg = nft_parse_register(tb[NFTA_META_SREG]);
d07db988	292	err = nft_validate_register_load(priv->sreg, len);
b38895c5 PNA	293	if (err < 0)
b38895c5 PNA	294	return err;
e035b77a ABG	295
e035b77a ABG	296	return 0;
96518518	297	}
aa45660c	298	EXPORT_SYMBOL_GPL(nft_meta_set_init);
96518518	299
aa45660c TB	300	int nft_meta_get_dump(struct sk_buff *skb,
aa45660c TB	301	const struct nft_expr *expr)
96518518 PM	302	{
	303	const struct nft_meta *priv = nft_expr_priv(expr);
	304
e035b77a ABG	305	if (nla_put_be32(skb, NFTA_META_KEY, htonl(priv->key)))
e035b77a ABG	306	goto nla_put_failure;
b1c96ed3	307	if (nft_dump_register(skb, NFTA_META_DREG, priv->dreg))
96518518	308	goto nla_put_failure;
e035b77a ABG	309	return 0;
	310
	311	nla_put_failure:
	312	return -1;
	313	}
aa45660c	314	EXPORT_SYMBOL_GPL(nft_meta_get_dump);
e035b77a	315
aa45660c TB	316	int nft_meta_set_dump(struct sk_buff *skb,
aa45660c TB	317	const struct nft_expr *expr)
e035b77a ABG	318	{
	319	const struct nft_meta *priv = nft_expr_priv(expr);
	320
96518518 PM	321	if (nla_put_be32(skb, NFTA_META_KEY, htonl(priv->key)))
96518518 PM	322	goto nla_put_failure;
b1c96ed3	323	if (nft_dump_register(skb, NFTA_META_SREG, priv->sreg))
e035b77a ABG	324	goto nla_put_failure;
e035b77a ABG	325
96518518 PM	326	return 0;
	327
	328	nla_put_failure:
	329	return -1;
	330	}
aa45660c	331	EXPORT_SYMBOL_GPL(nft_meta_set_dump);
96518518	332
ef1f7df9	333	static struct nft_expr_type nft_meta_type;
e035b77a	334	static const struct nft_expr_ops nft_meta_get_ops = {
ef1f7df9	335	.type = &nft_meta_type,
96518518	336	.size = NFT_EXPR_SIZE(sizeof(struct nft_meta)),
e035b77a	337	.eval = nft_meta_get_eval,
d2caa696	338	.init = nft_meta_get_init,
e035b77a	339	.dump = nft_meta_get_dump,
ef1f7df9 PM	340	};
ef1f7df9 PM	341
e035b77a ABG	342	static const struct nft_expr_ops nft_meta_set_ops = {
	343	.type = &nft_meta_type,
	344	.size = NFT_EXPR_SIZE(sizeof(struct nft_meta)),
	345	.eval = nft_meta_set_eval,
d2caa696	346	.init = nft_meta_set_init,
e035b77a ABG	347	.dump = nft_meta_set_dump,
	348	};
	349
	350	static const struct nft_expr_ops *
	351	nft_meta_select_ops(const struct nft_ctx *ctx,
	352	const struct nlattr * const tb[])
	353	{
	354	if (tb[NFTA_META_KEY] == NULL)
	355	return ERR_PTR(-EINVAL);
	356
	357	if (tb[NFTA_META_DREG] && tb[NFTA_META_SREG])
	358	return ERR_PTR(-EINVAL);
	359
	360	if (tb[NFTA_META_DREG])
	361	return &nft_meta_get_ops;
	362
	363	if (tb[NFTA_META_SREG])
	364	return &nft_meta_set_ops;
	365
	366	return ERR_PTR(-EINVAL);
	367	}
	368
ef1f7df9 PM	369	static struct nft_expr_type nft_meta_type __read_mostly = {
ef1f7df9 PM	370	.name = "meta",
e035b77a	371	.select_ops = &nft_meta_select_ops,
96518518 PM	372	.policy = nft_meta_policy,
96518518 PM	373	.maxattr = NFTA_META_MAX,
ef1f7df9	374	.owner = THIS_MODULE,
96518518 PM	375	};
	376
	377	static int __init nft_meta_module_init(void)
	378	{
ef1f7df9	379	return nft_register_expr(&nft_meta_type);
96518518 PM	380	}
	381
	382	static void __exit nft_meta_module_exit(void)
	383	{
ef1f7df9	384	nft_unregister_expr(&nft_meta_type);
96518518 PM	385	}
	386
	387	module_init(nft_meta_module_init);
	388	module_exit(nft_meta_module_exit);
	389
	390	MODULE_LICENSE("GPL");
	391	MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
	392	MODULE_ALIAS_NFT_EXPR("meta");