[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->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;
		*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->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];

	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 = 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:
fad136ea	45	*dest = pkt->ops->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
	138	switch (pkt->ops->pf) {
	139	case NFPROTO_IPV4:
	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;
ce674173	169	case NFT_META_CGROUP:
c5035c77 PNA	170	if (skb->sk == NULL \|\| !sk_fullsock(skb->sk))
c5035c77 PNA	171	goto err;
fad136ea	172	*dest = skb->sk->sk_classid;
ce674173	173	break;
96518518 PM	174	default:
	175	WARN_ON(1);
	176	goto err;
	177	}
	178	return;
	179
	180	err:
a55e22e9	181	regs->verdict.code = NFT_BREAK;
96518518	182	}
aa45660c	183	EXPORT_SYMBOL_GPL(nft_meta_get_eval);
96518518	184
aa45660c	185	void nft_meta_set_eval(const struct nft_expr *expr,
a55e22e9	186	struct nft_regs *regs,
aa45660c	187	const struct nft_pktinfo *pkt)
e035b77a ABG	188	{
	189	const struct nft_meta *meta = nft_expr_priv(expr);
	190	struct sk_buff *skb = pkt->skb;
49499c3e	191	u32 value = regs->data[meta->sreg];
e035b77a ABG	192
	193	switch (meta->key) {
	194	case NFT_META_MARK:
	195	skb->mark = value;
	196	break;
	197	case NFT_META_PRIORITY:
	198	skb->priority = value;
	199	break;
	200	case NFT_META_NFTRACE:
	201	skb->nf_trace = 1;
	202	break;
	203	default:
	204	WARN_ON(1);
	205	}
	206	}
aa45660c	207	EXPORT_SYMBOL_GPL(nft_meta_set_eval);
e035b77a	208
aa45660c	209	const struct nla_policy nft_meta_policy[NFTA_META_MAX + 1] = {
96518518 PM	210	[NFTA_META_DREG] = { .type = NLA_U32 },
96518518 PM	211	[NFTA_META_KEY] = { .type = NLA_U32 },
e035b77a	212	[NFTA_META_SREG] = { .type = NLA_U32 },
96518518	213	};
aa45660c	214	EXPORT_SYMBOL_GPL(nft_meta_policy);
96518518	215
aa45660c TB	216	int nft_meta_get_init(const struct nft_ctx *ctx,
	217	const struct nft_expr *expr,
	218	const struct nlattr * const tb[])
96518518	219	{
d2caa696	220	struct nft_meta *priv = nft_expr_priv(expr);
45d9bcda	221	unsigned int len;
96518518	222
d2caa696 PM	223	priv->key = ntohl(nla_get_be32(tb[NFTA_META_KEY]));
d2caa696 PM	224	switch (priv->key) {
96518518	225	case NFT_META_PROTOCOL:
45d9bcda PM	226	case NFT_META_IIFTYPE:
	227	case NFT_META_OIFTYPE:
	228	len = sizeof(u16);
	229	break;
124edfa9	230	case NFT_META_NFPROTO:
4566bf27	231	case NFT_META_L4PROTO:
45d9bcda	232	case NFT_META_LEN:
96518518 PM	233	case NFT_META_PRIORITY:
	234	case NFT_META_MARK:
	235	case NFT_META_IIF:
	236	case NFT_META_OIF:
96518518 PM	237	case NFT_META_SKUID:
96518518 PM	238	case NFT_META_SKGID:
06efbd6d	239	#ifdef CONFIG_IP_ROUTE_CLASSID
96518518 PM	240	case NFT_META_RTCLASSID:
	241	#endif
	242	#ifdef CONFIG_NETWORK_SECMARK
	243	case NFT_META_SECMARK:
	244	#endif
e2a093ff	245	case NFT_META_PKTTYPE:
afc5be30	246	case NFT_META_CPU:
3045d760 AR	247	case NFT_META_IIFGROUP:
3045d760 AR	248	case NFT_META_OIFGROUP:
ce674173	249	case NFT_META_CGROUP:
45d9bcda PM	250	len = sizeof(u32);
	251	break;
	252	case NFT_META_IIFNAME:
	253	case NFT_META_OIFNAME:
	254	len = IFNAMSIZ;
d2caa696	255	break;
96518518 PM	256	default:
	257	return -EOPNOTSUPP;
	258	}
	259
b1c96ed3	260	priv->dreg = nft_parse_register(tb[NFTA_META_DREG]);
27e6d201 PM	261	return nft_validate_register_store(ctx, priv->dreg, NULL,
27e6d201 PM	262	NFT_DATA_VALUE, len);
e035b77a	263	}
aa45660c	264	EXPORT_SYMBOL_GPL(nft_meta_get_init);
e035b77a	265
aa45660c TB	266	int nft_meta_set_init(const struct nft_ctx *ctx,
	267	const struct nft_expr *expr,
	268	const struct nlattr * const tb[])
e035b77a ABG	269	{
e035b77a ABG	270	struct nft_meta *priv = nft_expr_priv(expr);
d07db988	271	unsigned int len;
e035b77a ABG	272	int err;
	273
	274	priv->key = ntohl(nla_get_be32(tb[NFTA_META_KEY]));
d2caa696 PM	275	switch (priv->key) {
	276	case NFT_META_MARK:
	277	case NFT_META_PRIORITY:
d07db988 PM	278	len = sizeof(u32);
d07db988 PM	279	break;
d2caa696	280	case NFT_META_NFTRACE:
d07db988	281	len = sizeof(u8);
d2caa696 PM	282	break;
	283	default:
	284	return -EOPNOTSUPP;
e035b77a ABG	285	}
e035b77a ABG	286
b1c96ed3	287	priv->sreg = nft_parse_register(tb[NFTA_META_SREG]);
d07db988	288	err = nft_validate_register_load(priv->sreg, len);
b38895c5 PNA	289	if (err < 0)
b38895c5 PNA	290	return err;
e035b77a ABG	291
e035b77a ABG	292	return 0;
96518518	293	}
aa45660c	294	EXPORT_SYMBOL_GPL(nft_meta_set_init);
96518518	295
aa45660c TB	296	int nft_meta_get_dump(struct sk_buff *skb,
aa45660c TB	297	const struct nft_expr *expr)
96518518 PM	298	{
	299	const struct nft_meta *priv = nft_expr_priv(expr);
	300
e035b77a ABG	301	if (nla_put_be32(skb, NFTA_META_KEY, htonl(priv->key)))
e035b77a ABG	302	goto nla_put_failure;
b1c96ed3	303	if (nft_dump_register(skb, NFTA_META_DREG, priv->dreg))
96518518	304	goto nla_put_failure;
e035b77a ABG	305	return 0;
	306
	307	nla_put_failure:
	308	return -1;
	309	}
aa45660c	310	EXPORT_SYMBOL_GPL(nft_meta_get_dump);
e035b77a	311
aa45660c TB	312	int nft_meta_set_dump(struct sk_buff *skb,
aa45660c TB	313	const struct nft_expr *expr)
e035b77a ABG	314	{
	315	const struct nft_meta *priv = nft_expr_priv(expr);
	316
96518518 PM	317	if (nla_put_be32(skb, NFTA_META_KEY, htonl(priv->key)))
96518518 PM	318	goto nla_put_failure;
b1c96ed3	319	if (nft_dump_register(skb, NFTA_META_SREG, priv->sreg))
e035b77a ABG	320	goto nla_put_failure;
e035b77a ABG	321
96518518 PM	322	return 0;
	323
	324	nla_put_failure:
	325	return -1;
	326	}
aa45660c	327	EXPORT_SYMBOL_GPL(nft_meta_set_dump);
96518518	328
ef1f7df9	329	static struct nft_expr_type nft_meta_type;
e035b77a	330	static const struct nft_expr_ops nft_meta_get_ops = {
ef1f7df9	331	.type = &nft_meta_type,
96518518	332	.size = NFT_EXPR_SIZE(sizeof(struct nft_meta)),
e035b77a	333	.eval = nft_meta_get_eval,
d2caa696	334	.init = nft_meta_get_init,
e035b77a	335	.dump = nft_meta_get_dump,
ef1f7df9 PM	336	};
ef1f7df9 PM	337
e035b77a ABG	338	static const struct nft_expr_ops nft_meta_set_ops = {
	339	.type = &nft_meta_type,
	340	.size = NFT_EXPR_SIZE(sizeof(struct nft_meta)),
	341	.eval = nft_meta_set_eval,
d2caa696	342	.init = nft_meta_set_init,
e035b77a ABG	343	.dump = nft_meta_set_dump,
	344	};
	345
	346	static const struct nft_expr_ops *
	347	nft_meta_select_ops(const struct nft_ctx *ctx,
	348	const struct nlattr * const tb[])
	349	{
	350	if (tb[NFTA_META_KEY] == NULL)
	351	return ERR_PTR(-EINVAL);
	352
	353	if (tb[NFTA_META_DREG] && tb[NFTA_META_SREG])
	354	return ERR_PTR(-EINVAL);
	355
	356	if (tb[NFTA_META_DREG])
	357	return &nft_meta_get_ops;
	358
	359	if (tb[NFTA_META_SREG])
	360	return &nft_meta_set_ops;
	361
	362	return ERR_PTR(-EINVAL);
	363	}
	364
ef1f7df9 PM	365	static struct nft_expr_type nft_meta_type __read_mostly = {
ef1f7df9 PM	366	.name = "meta",
e035b77a	367	.select_ops = &nft_meta_select_ops,
96518518 PM	368	.policy = nft_meta_policy,
96518518 PM	369	.maxattr = NFTA_META_MAX,
ef1f7df9	370	.owner = THIS_MODULE,
96518518 PM	371	};
	372
	373	static int __init nft_meta_module_init(void)
	374	{
ef1f7df9	375	return nft_register_expr(&nft_meta_type);
96518518 PM	376	}
	377
	378	static void __exit nft_meta_module_exit(void)
	379	{
ef1f7df9	380	nft_unregister_expr(&nft_meta_type);
96518518 PM	381	}
	382
	383	module_init(nft_meta_module_init);
	384	module_exit(nft_meta_module_exit);
	385
	386	MODULE_LICENSE("GPL");
	387	MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
	388	MODULE_ALIAS_NFT_EXPR("meta");