[linux-2.6-block.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;
	struct sock *sk;
	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:
		sk = skb_to_full_sk(skb);
		if (!sk || !sk_fullsock(sk))
			goto err;

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

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

		read_lock_bh(&sk->sk_callback_lock);
		if (sk->sk_socket == NULL ||
		    sk->sk_socket->file == NULL) {
			read_unlock_bh(&sk->sk_callback_lock);
			goto err;
		}
		*dest =	from_kgid_munged(&init_user_ns,
				 sk->sk_socket->file->f_cred->fsgid);
		read_unlock_bh(&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:
		sk = skb_to_full_sk(skb);
		if (!sk || !sk_fullsock(sk))
			goto err;
		*dest = 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;
3aed8225	34	struct sock *sk;
49499c3e	35	u32 *dest = &regs->data[priv->dreg];
96518518 PM	36
	37	switch (priv->key) {
	38	case NFT_META_LEN:
fad136ea	39	*dest = skb->len;
96518518 PM	40	break;
96518518 PM	41	case NFT_META_PROTOCOL:
49499c3e	42	*dest = 0;
fad136ea	43	(__be16 )dest = skb->protocol;
96518518	44	break;
124edfa9	45	case NFT_META_NFPROTO:
6aa187f2	46	*dest = pkt->pf;
124edfa9	47	break;
4566bf27	48	case NFT_META_L4PROTO:
fad136ea	49	*dest = pkt->tprot;
4566bf27	50	break;
96518518	51	case NFT_META_PRIORITY:
fad136ea	52	*dest = skb->priority;
96518518 PM	53	break;
96518518 PM	54	case NFT_META_MARK:
fad136ea	55	*dest = skb->mark;
96518518 PM	56	break;
	57	case NFT_META_IIF:
	58	if (in == NULL)
	59	goto err;
fad136ea	60	*dest = in->ifindex;
96518518 PM	61	break;
	62	case NFT_META_OIF:
	63	if (out == NULL)
	64	goto err;
fad136ea	65	*dest = out->ifindex;
96518518 PM	66	break;
	67	case NFT_META_IIFNAME:
	68	if (in == NULL)
	69	goto err;
fad136ea	70	strncpy((char *)dest, in->name, IFNAMSIZ);
96518518 PM	71	break;
	72	case NFT_META_OIFNAME:
	73	if (out == NULL)
	74	goto err;
fad136ea	75	strncpy((char *)dest, out->name, IFNAMSIZ);
96518518 PM	76	break;
	77	case NFT_META_IIFTYPE:
	78	if (in == NULL)
	79	goto err;
49499c3e	80	*dest = 0;
fad136ea	81	(u16 )dest = in->type;
96518518 PM	82	break;
	83	case NFT_META_OIFTYPE:
	84	if (out == NULL)
	85	goto err;
49499c3e	86	*dest = 0;
fad136ea	87	(u16 )dest = out->type;
96518518 PM	88	break;
96518518 PM	89	case NFT_META_SKUID:
3aed8225 ED	90	sk = skb_to_full_sk(skb);
3aed8225 ED	91	if (!sk \|\| !sk_fullsock(sk))
96518518 PM	92	goto err;
96518518 PM	93
3aed8225 ED	94	read_lock_bh(&sk->sk_callback_lock);
	95	if (sk->sk_socket == NULL \|\|
	96	sk->sk_socket->file == NULL) {
	97	read_unlock_bh(&sk->sk_callback_lock);
96518518 PM	98	goto err;
	99	}
	100
fad136ea	101	*dest = from_kuid_munged(&init_user_ns,
3aed8225 ED	102	sk->sk_socket->file->f_cred->fsuid);
3aed8225 ED	103	read_unlock_bh(&sk->sk_callback_lock);
96518518 PM	104	break;
96518518 PM	105	case NFT_META_SKGID:
3aed8225 ED	106	sk = skb_to_full_sk(skb);
3aed8225 ED	107	if (!sk \|\| !sk_fullsock(sk))
96518518 PM	108	goto err;
96518518 PM	109
3aed8225 ED	110	read_lock_bh(&sk->sk_callback_lock);
	111	if (sk->sk_socket == NULL \|\|
	112	sk->sk_socket->file == NULL) {
	113	read_unlock_bh(&sk->sk_callback_lock);
96518518 PM	114	goto err;
96518518 PM	115	}
fad136ea	116	*dest = from_kgid_munged(&init_user_ns,
3aed8225 ED	117	sk->sk_socket->file->f_cred->fsgid);
3aed8225 ED	118	read_unlock_bh(&sk->sk_callback_lock);
96518518	119	break;
06efbd6d	120	#ifdef CONFIG_IP_ROUTE_CLASSID
96518518 PM	121	case NFT_META_RTCLASSID: {
	122	const struct dst_entry *dst = skb_dst(skb);
	123
	124	if (dst == NULL)
	125	goto err;
fad136ea	126	*dest = dst->tclassid;
96518518 PM	127	break;
	128	}
	129	#endif
	130	#ifdef CONFIG_NETWORK_SECMARK
	131	case NFT_META_SECMARK:
fad136ea	132	*dest = skb->secmark;
96518518 PM	133	break;
96518518 PM	134	#endif
e2a093ff AR	135	case NFT_META_PKTTYPE:
e2a093ff AR	136	if (skb->pkt_type != PACKET_LOOPBACK) {
fad136ea	137	*dest = skb->pkt_type;
e2a093ff AR	138	break;
	139	}
	140
6aa187f2	141	switch (pkt->pf) {
e2a093ff AR	142	case NFPROTO_IPV4:
e2a093ff AR	143	if (ipv4_is_multicast(ip_hdr(skb)->daddr))
fad136ea	144	*dest = PACKET_MULTICAST;
e2a093ff	145	else
fad136ea	146	*dest = PACKET_BROADCAST;
e2a093ff AR	147	break;
	148	case NFPROTO_IPV6:
	149	if (ipv6_hdr(skb)->daddr.s6_addr[0] == 0xFF)
fad136ea	150	*dest = PACKET_MULTICAST;
e2a093ff	151	else
fad136ea	152	*dest = PACKET_BROADCAST;
e2a093ff AR	153	break;
	154	default:
	155	WARN_ON(1);
	156	goto err;
	157	}
	158	break;
afc5be30	159	case NFT_META_CPU:
fad136ea	160	*dest = raw_smp_processor_id();
afc5be30	161	break;
3045d760 AR	162	case NFT_META_IIFGROUP:
	163	if (in == NULL)
	164	goto err;
fad136ea	165	*dest = in->group;
3045d760 AR	166	break;
	167	case NFT_META_OIFGROUP:
	168	if (out == NULL)
	169	goto err;
fad136ea	170	*dest = out->group;
3045d760	171	break;
e181a543	172	#ifdef CONFIG_CGROUP_NET_CLASSID
ce674173	173	case NFT_META_CGROUP:
3aed8225 ED	174	sk = skb_to_full_sk(skb);
3aed8225 ED	175	if (!sk \|\| !sk_fullsock(sk))
c5035c77	176	goto err;
3aed8225	177	*dest = sk->sk_classid;
ce674173	178	break;
e181a543	179	#endif
96518518 PM	180	default:
	181	WARN_ON(1);
	182	goto err;
	183	}
	184	return;
	185
	186	err:
a55e22e9	187	regs->verdict.code = NFT_BREAK;
96518518	188	}
aa45660c	189	EXPORT_SYMBOL_GPL(nft_meta_get_eval);
96518518	190
aa45660c	191	void nft_meta_set_eval(const struct nft_expr *expr,
a55e22e9	192	struct nft_regs *regs,
aa45660c	193	const struct nft_pktinfo *pkt)
e035b77a ABG	194	{
	195	const struct nft_meta *meta = nft_expr_priv(expr);
	196	struct sk_buff *skb = pkt->skb;
49499c3e	197	u32 value = regs->data[meta->sreg];
e035b77a ABG	198
	199	switch (meta->key) {
	200	case NFT_META_MARK:
	201	skb->mark = value;
	202	break;
	203	case NFT_META_PRIORITY:
	204	skb->priority = value;
	205	break;
	206	case NFT_META_NFTRACE:
	207	skb->nf_trace = 1;
	208	break;
	209	default:
	210	WARN_ON(1);
	211	}
	212	}
aa45660c	213	EXPORT_SYMBOL_GPL(nft_meta_set_eval);
e035b77a	214
aa45660c	215	const struct nla_policy nft_meta_policy[NFTA_META_MAX + 1] = {
96518518 PM	216	[NFTA_META_DREG] = { .type = NLA_U32 },
96518518 PM	217	[NFTA_META_KEY] = { .type = NLA_U32 },
e035b77a	218	[NFTA_META_SREG] = { .type = NLA_U32 },
96518518	219	};
aa45660c	220	EXPORT_SYMBOL_GPL(nft_meta_policy);
96518518	221
aa45660c TB	222	int nft_meta_get_init(const struct nft_ctx *ctx,
	223	const struct nft_expr *expr,
	224	const struct nlattr * const tb[])
96518518	225	{
d2caa696	226	struct nft_meta *priv = nft_expr_priv(expr);
45d9bcda	227	unsigned int len;
96518518	228
d2caa696 PM	229	priv->key = ntohl(nla_get_be32(tb[NFTA_META_KEY]));
d2caa696 PM	230	switch (priv->key) {
96518518	231	case NFT_META_PROTOCOL:
45d9bcda PM	232	case NFT_META_IIFTYPE:
	233	case NFT_META_OIFTYPE:
	234	len = sizeof(u16);
	235	break;
124edfa9	236	case NFT_META_NFPROTO:
4566bf27	237	case NFT_META_L4PROTO:
45d9bcda	238	case NFT_META_LEN:
96518518 PM	239	case NFT_META_PRIORITY:
	240	case NFT_META_MARK:
	241	case NFT_META_IIF:
	242	case NFT_META_OIF:
96518518 PM	243	case NFT_META_SKUID:
96518518 PM	244	case NFT_META_SKGID:
06efbd6d	245	#ifdef CONFIG_IP_ROUTE_CLASSID
96518518 PM	246	case NFT_META_RTCLASSID:
	247	#endif
	248	#ifdef CONFIG_NETWORK_SECMARK
	249	case NFT_META_SECMARK:
	250	#endif
e2a093ff	251	case NFT_META_PKTTYPE:
afc5be30	252	case NFT_META_CPU:
3045d760 AR	253	case NFT_META_IIFGROUP:
3045d760 AR	254	case NFT_META_OIFGROUP:
e181a543	255	#ifdef CONFIG_CGROUP_NET_CLASSID
ce674173	256	case NFT_META_CGROUP:
e181a543	257	#endif
45d9bcda PM	258	len = sizeof(u32);
	259	break;
	260	case NFT_META_IIFNAME:
	261	case NFT_META_OIFNAME:
	262	len = IFNAMSIZ;
d2caa696	263	break;
96518518 PM	264	default:
	265	return -EOPNOTSUPP;
	266	}
	267
b1c96ed3	268	priv->dreg = nft_parse_register(tb[NFTA_META_DREG]);
27e6d201 PM	269	return nft_validate_register_store(ctx, priv->dreg, NULL,
27e6d201 PM	270	NFT_DATA_VALUE, len);
e035b77a	271	}
aa45660c	272	EXPORT_SYMBOL_GPL(nft_meta_get_init);
e035b77a	273
aa45660c TB	274	int nft_meta_set_init(const struct nft_ctx *ctx,
	275	const struct nft_expr *expr,
	276	const struct nlattr * const tb[])
e035b77a ABG	277	{
e035b77a ABG	278	struct nft_meta *priv = nft_expr_priv(expr);
d07db988	279	unsigned int len;
e035b77a ABG	280	int err;
	281
	282	priv->key = ntohl(nla_get_be32(tb[NFTA_META_KEY]));
d2caa696 PM	283	switch (priv->key) {
	284	case NFT_META_MARK:
	285	case NFT_META_PRIORITY:
d07db988 PM	286	len = sizeof(u32);
d07db988 PM	287	break;
d2caa696	288	case NFT_META_NFTRACE:
d07db988	289	len = sizeof(u8);
d2caa696 PM	290	break;
	291	default:
	292	return -EOPNOTSUPP;
e035b77a ABG	293	}
e035b77a ABG	294
b1c96ed3	295	priv->sreg = nft_parse_register(tb[NFTA_META_SREG]);
d07db988	296	err = nft_validate_register_load(priv->sreg, len);
b38895c5 PNA	297	if (err < 0)
b38895c5 PNA	298	return err;
e035b77a ABG	299
e035b77a ABG	300	return 0;
96518518	301	}
aa45660c	302	EXPORT_SYMBOL_GPL(nft_meta_set_init);
96518518	303
aa45660c TB	304	int nft_meta_get_dump(struct sk_buff *skb,
aa45660c TB	305	const struct nft_expr *expr)
96518518 PM	306	{
	307	const struct nft_meta *priv = nft_expr_priv(expr);
	308
e035b77a ABG	309	if (nla_put_be32(skb, NFTA_META_KEY, htonl(priv->key)))
e035b77a ABG	310	goto nla_put_failure;
b1c96ed3	311	if (nft_dump_register(skb, NFTA_META_DREG, priv->dreg))
96518518	312	goto nla_put_failure;
e035b77a ABG	313	return 0;
	314
	315	nla_put_failure:
	316	return -1;
	317	}
aa45660c	318	EXPORT_SYMBOL_GPL(nft_meta_get_dump);
e035b77a	319
aa45660c TB	320	int nft_meta_set_dump(struct sk_buff *skb,
aa45660c TB	321	const struct nft_expr *expr)
e035b77a ABG	322	{
	323	const struct nft_meta *priv = nft_expr_priv(expr);
	324
96518518 PM	325	if (nla_put_be32(skb, NFTA_META_KEY, htonl(priv->key)))
96518518 PM	326	goto nla_put_failure;
b1c96ed3	327	if (nft_dump_register(skb, NFTA_META_SREG, priv->sreg))
e035b77a ABG	328	goto nla_put_failure;
e035b77a ABG	329
96518518 PM	330	return 0;
	331
	332	nla_put_failure:
	333	return -1;
	334	}
aa45660c	335	EXPORT_SYMBOL_GPL(nft_meta_set_dump);
96518518	336
ef1f7df9	337	static struct nft_expr_type nft_meta_type;
e035b77a	338	static const struct nft_expr_ops nft_meta_get_ops = {
ef1f7df9	339	.type = &nft_meta_type,
96518518	340	.size = NFT_EXPR_SIZE(sizeof(struct nft_meta)),
e035b77a	341	.eval = nft_meta_get_eval,
d2caa696	342	.init = nft_meta_get_init,
e035b77a	343	.dump = nft_meta_get_dump,
ef1f7df9 PM	344	};
ef1f7df9 PM	345
e035b77a ABG	346	static const struct nft_expr_ops nft_meta_set_ops = {
	347	.type = &nft_meta_type,
	348	.size = NFT_EXPR_SIZE(sizeof(struct nft_meta)),
	349	.eval = nft_meta_set_eval,
d2caa696	350	.init = nft_meta_set_init,
e035b77a ABG	351	.dump = nft_meta_set_dump,
	352	};
	353
	354	static const struct nft_expr_ops *
	355	nft_meta_select_ops(const struct nft_ctx *ctx,
	356	const struct nlattr * const tb[])
	357	{
	358	if (tb[NFTA_META_KEY] == NULL)
	359	return ERR_PTR(-EINVAL);
	360
	361	if (tb[NFTA_META_DREG] && tb[NFTA_META_SREG])
	362	return ERR_PTR(-EINVAL);
	363
	364	if (tb[NFTA_META_DREG])
	365	return &nft_meta_get_ops;
	366
	367	if (tb[NFTA_META_SREG])
	368	return &nft_meta_set_ops;
	369
	370	return ERR_PTR(-EINVAL);
	371	}
	372
ef1f7df9 PM	373	static struct nft_expr_type nft_meta_type __read_mostly = {
ef1f7df9 PM	374	.name = "meta",
e035b77a	375	.select_ops = &nft_meta_select_ops,
96518518 PM	376	.policy = nft_meta_policy,
96518518 PM	377	.maxattr = NFTA_META_MAX,
ef1f7df9	378	.owner = THIS_MODULE,
96518518 PM	379	};
	380
	381	static int __init nft_meta_module_init(void)
	382	{
ef1f7df9	383	return nft_register_expr(&nft_meta_type);
96518518 PM	384	}
	385
	386	static void __exit nft_meta_module_exit(void)
	387	{
ef1f7df9	388	nft_unregister_expr(&nft_meta_type);
96518518 PM	389	}
	390
	391	module_init(nft_meta_module_init);
	392	module_exit(nft_meta_module_exit);
	393
	394	MODULE_LICENSE("GPL");
	395	MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
	396	MODULE_ALIAS_NFT_EXPR("meta");