[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 <linux/static_key.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/nf_tables_core.h>
#include <net/netfilter/nft_meta.h>

#include <uapi/linux/netfilter_bridge.h> /* NF_BR_PRE_ROUTING */

static DEFINE_PER_CPU(struct rnd_state, nft_prandom_state);

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 = sock_cgroup_classid(&sk->sk_cgrp_data);
		break;
#endif
	case NFT_META_PRANDOM: {
		struct rnd_state *state = this_cpu_ptr(&nft_prandom_state);
		*dest = prandom_u32_state(state);
		break;
	}
	default:
		WARN_ON(1);
		goto err;
	}
	return;

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

/* don't change or set _LOOPBACK, _USER, etc. */
static bool pkt_type_ok(u32 p)
{
	return p == PACKET_HOST || p == PACKET_BROADCAST ||
	       p == PACKET_MULTICAST || p == PACKET_OTHERHOST;
}

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_PKTTYPE:
		if (skb->pkt_type != value &&
		    pkt_type_ok(value) && pkt_type_ok(skb->pkt_type))
			skb->pkt_type = 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;
	case NFT_META_PRANDOM:
		prandom_init_once(&nft_prandom_state);
		len = sizeof(u32);
		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);

static int nft_meta_set_init_pkttype(const struct nft_ctx *ctx)
{
	unsigned int hooks;

	switch (ctx->afi->family) {
	case NFPROTO_BRIDGE:
		hooks = 1 << NF_BR_PRE_ROUTING;
		break;
	case NFPROTO_NETDEV:
		hooks = 1 << NF_NETDEV_INGRESS;
		break;
	default:
		return -EOPNOTSUPP;
	}

	return nft_chain_validate_hooks(ctx->chain, hooks);
}

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;
	case NFT_META_PKTTYPE:
		err = nft_meta_set_init_pkttype(ctx);
		if (err)
			return err;
		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;

	if (priv->key == NFT_META_NFTRACE)
		static_branch_inc(&nft_trace_enabled);

	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);

void nft_meta_set_destroy(const struct nft_ctx *ctx,
			  const struct nft_expr *expr)
{
	const struct nft_meta *priv = nft_expr_priv(expr);

	if (priv->key == NFT_META_NFTRACE)
		static_branch_dec(&nft_trace_enabled);
}
EXPORT_SYMBOL_GPL(nft_meta_set_destroy);

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,
	.destroy	= nft_meta_set_destroy,
	.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>
e639f7ab	21	#include <linux/static_key.h>
96518518 PM	22	#include <net/dst.h>
	23	#include <net/sock.h>
	24	#include <net/tcp_states.h> /* for TCP_TIME_WAIT */
	25	#include <net/netfilter/nf_tables.h>
e639f7ab	26	#include <net/netfilter/nf_tables_core.h>
aa45660c	27	#include <net/netfilter/nft_meta.h>
96518518	28
b4aae759 FW	29	#include <uapi/linux/netfilter_bridge.h> /* NF_BR_PRE_ROUTING */
b4aae759 FW	30
b07edbe1 FW	31	static DEFINE_PER_CPU(struct rnd_state, nft_prandom_state);
b07edbe1 FW	32
aa45660c	33	void nft_meta_get_eval(const struct nft_expr *expr,
a55e22e9	34	struct nft_regs *regs,
aa45660c	35	const struct nft_pktinfo *pkt)
96518518 PM	36	{
	37	const struct nft_meta *priv = nft_expr_priv(expr);
	38	const struct sk_buff *skb = pkt->skb;
	39	const struct net_device in = pkt->in, out = pkt->out;
3aed8225	40	struct sock *sk;
49499c3e	41	u32 *dest = &regs->data[priv->dreg];
96518518 PM	42
	43	switch (priv->key) {
	44	case NFT_META_LEN:
fad136ea	45	*dest = skb->len;
96518518 PM	46	break;
96518518 PM	47	case NFT_META_PROTOCOL:
49499c3e	48	*dest = 0;
fad136ea	49	(__be16 )dest = skb->protocol;
96518518	50	break;
124edfa9	51	case NFT_META_NFPROTO:
6aa187f2	52	*dest = pkt->pf;
124edfa9	53	break;
4566bf27	54	case NFT_META_L4PROTO:
fad136ea	55	*dest = pkt->tprot;
4566bf27	56	break;
96518518	57	case NFT_META_PRIORITY:
fad136ea	58	*dest = skb->priority;
96518518 PM	59	break;
96518518 PM	60	case NFT_META_MARK:
fad136ea	61	*dest = skb->mark;
96518518 PM	62	break;
	63	case NFT_META_IIF:
	64	if (in == NULL)
	65	goto err;
fad136ea	66	*dest = in->ifindex;
96518518 PM	67	break;
	68	case NFT_META_OIF:
	69	if (out == NULL)
	70	goto err;
fad136ea	71	*dest = out->ifindex;
96518518 PM	72	break;
	73	case NFT_META_IIFNAME:
	74	if (in == NULL)
	75	goto err;
fad136ea	76	strncpy((char *)dest, in->name, IFNAMSIZ);
96518518 PM	77	break;
	78	case NFT_META_OIFNAME:
	79	if (out == NULL)
	80	goto err;
fad136ea	81	strncpy((char *)dest, out->name, IFNAMSIZ);
96518518 PM	82	break;
	83	case NFT_META_IIFTYPE:
	84	if (in == NULL)
	85	goto err;
49499c3e	86	*dest = 0;
fad136ea	87	(u16 )dest = in->type;
96518518 PM	88	break;
	89	case NFT_META_OIFTYPE:
	90	if (out == NULL)
	91	goto err;
49499c3e	92	*dest = 0;
fad136ea	93	(u16 )dest = out->type;
96518518 PM	94	break;
96518518 PM	95	case NFT_META_SKUID:
3aed8225 ED	96	sk = skb_to_full_sk(skb);
3aed8225 ED	97	if (!sk \|\| !sk_fullsock(sk))
96518518 PM	98	goto err;
96518518 PM	99
3aed8225 ED	100	read_lock_bh(&sk->sk_callback_lock);
	101	if (sk->sk_socket == NULL \|\|
	102	sk->sk_socket->file == NULL) {
	103	read_unlock_bh(&sk->sk_callback_lock);
96518518 PM	104	goto err;
	105	}
	106
fad136ea	107	*dest = from_kuid_munged(&init_user_ns,
3aed8225 ED	108	sk->sk_socket->file->f_cred->fsuid);
3aed8225 ED	109	read_unlock_bh(&sk->sk_callback_lock);
96518518 PM	110	break;
96518518 PM	111	case NFT_META_SKGID:
3aed8225 ED	112	sk = skb_to_full_sk(skb);
3aed8225 ED	113	if (!sk \|\| !sk_fullsock(sk))
96518518 PM	114	goto err;
96518518 PM	115
3aed8225 ED	116	read_lock_bh(&sk->sk_callback_lock);
	117	if (sk->sk_socket == NULL \|\|
	118	sk->sk_socket->file == NULL) {
	119	read_unlock_bh(&sk->sk_callback_lock);
96518518 PM	120	goto err;
96518518 PM	121	}
fad136ea	122	*dest = from_kgid_munged(&init_user_ns,
3aed8225 ED	123	sk->sk_socket->file->f_cred->fsgid);
3aed8225 ED	124	read_unlock_bh(&sk->sk_callback_lock);
96518518	125	break;
06efbd6d	126	#ifdef CONFIG_IP_ROUTE_CLASSID
96518518 PM	127	case NFT_META_RTCLASSID: {
	128	const struct dst_entry *dst = skb_dst(skb);
	129
	130	if (dst == NULL)
	131	goto err;
fad136ea	132	*dest = dst->tclassid;
96518518 PM	133	break;
	134	}
	135	#endif
	136	#ifdef CONFIG_NETWORK_SECMARK
	137	case NFT_META_SECMARK:
fad136ea	138	*dest = skb->secmark;
96518518 PM	139	break;
96518518 PM	140	#endif
e2a093ff AR	141	case NFT_META_PKTTYPE:
e2a093ff AR	142	if (skb->pkt_type != PACKET_LOOPBACK) {
fad136ea	143	*dest = skb->pkt_type;
e2a093ff AR	144	break;
	145	}
	146
6aa187f2	147	switch (pkt->pf) {
e2a093ff AR	148	case NFPROTO_IPV4:
e2a093ff AR	149	if (ipv4_is_multicast(ip_hdr(skb)->daddr))
fad136ea	150	*dest = PACKET_MULTICAST;
e2a093ff	151	else
fad136ea	152	*dest = PACKET_BROADCAST;
e2a093ff AR	153	break;
	154	case NFPROTO_IPV6:
	155	if (ipv6_hdr(skb)->daddr.s6_addr[0] == 0xFF)
fad136ea	156	*dest = PACKET_MULTICAST;
e2a093ff	157	else
fad136ea	158	*dest = PACKET_BROADCAST;
e2a093ff AR	159	break;
	160	default:
	161	WARN_ON(1);
	162	goto err;
	163	}
	164	break;
afc5be30	165	case NFT_META_CPU:
fad136ea	166	*dest = raw_smp_processor_id();
afc5be30	167	break;
3045d760 AR	168	case NFT_META_IIFGROUP:
	169	if (in == NULL)
	170	goto err;
fad136ea	171	*dest = in->group;
3045d760 AR	172	break;
	173	case NFT_META_OIFGROUP:
	174	if (out == NULL)
	175	goto err;
fad136ea	176	*dest = out->group;
3045d760	177	break;
e181a543	178	#ifdef CONFIG_CGROUP_NET_CLASSID
ce674173	179	case NFT_META_CGROUP:
3aed8225 ED	180	sk = skb_to_full_sk(skb);
3aed8225 ED	181	if (!sk \|\| !sk_fullsock(sk))
c5035c77	182	goto err;
2a56a1fe	183	*dest = sock_cgroup_classid(&sk->sk_cgrp_data);
ce674173	184	break;
e181a543	185	#endif
b07edbe1 FW	186	case NFT_META_PRANDOM: {
	187	struct rnd_state *state = this_cpu_ptr(&nft_prandom_state);
	188	*dest = prandom_u32_state(state);
	189	break;
	190	}
96518518 PM	191	default:
	192	WARN_ON(1);
	193	goto err;
	194	}
	195	return;
	196
	197	err:
a55e22e9	198	regs->verdict.code = NFT_BREAK;
96518518	199	}
aa45660c	200	EXPORT_SYMBOL_GPL(nft_meta_get_eval);
96518518	201
b4aae759 FW	202	/* don't change or set _LOOPBACK, _USER, etc. */
	203	static bool pkt_type_ok(u32 p)
	204	{
	205	return p == PACKET_HOST \|\| p == PACKET_BROADCAST \|\|
	206	p == PACKET_MULTICAST \|\| p == PACKET_OTHERHOST;
	207	}
	208
aa45660c	209	void nft_meta_set_eval(const struct nft_expr *expr,
a55e22e9	210	struct nft_regs *regs,
aa45660c	211	const struct nft_pktinfo *pkt)
e035b77a ABG	212	{
	213	const struct nft_meta *meta = nft_expr_priv(expr);
	214	struct sk_buff *skb = pkt->skb;
49499c3e	215	u32 value = regs->data[meta->sreg];
e035b77a ABG	216
	217	switch (meta->key) {
	218	case NFT_META_MARK:
	219	skb->mark = value;
	220	break;
	221	case NFT_META_PRIORITY:
	222	skb->priority = value;
	223	break;
b4aae759 FW	224	case NFT_META_PKTTYPE:
	225	if (skb->pkt_type != value &&
	226	pkt_type_ok(value) && pkt_type_ok(skb->pkt_type))
	227	skb->pkt_type = value;
	228	break;
e035b77a ABG	229	case NFT_META_NFTRACE:
	230	skb->nf_trace = 1;
	231	break;
	232	default:
	233	WARN_ON(1);
	234	}
	235	}
aa45660c	236	EXPORT_SYMBOL_GPL(nft_meta_set_eval);
e035b77a	237
aa45660c	238	const struct nla_policy nft_meta_policy[NFTA_META_MAX + 1] = {
96518518 PM	239	[NFTA_META_DREG] = { .type = NLA_U32 },
96518518 PM	240	[NFTA_META_KEY] = { .type = NLA_U32 },
e035b77a	241	[NFTA_META_SREG] = { .type = NLA_U32 },
96518518	242	};
aa45660c	243	EXPORT_SYMBOL_GPL(nft_meta_policy);
96518518	244
aa45660c TB	245	int nft_meta_get_init(const struct nft_ctx *ctx,
	246	const struct nft_expr *expr,
	247	const struct nlattr * const tb[])
96518518	248	{
d2caa696	249	struct nft_meta *priv = nft_expr_priv(expr);
45d9bcda	250	unsigned int len;
96518518	251
d2caa696 PM	252	priv->key = ntohl(nla_get_be32(tb[NFTA_META_KEY]));
d2caa696 PM	253	switch (priv->key) {
96518518	254	case NFT_META_PROTOCOL:
45d9bcda PM	255	case NFT_META_IIFTYPE:
	256	case NFT_META_OIFTYPE:
	257	len = sizeof(u16);
	258	break;
124edfa9	259	case NFT_META_NFPROTO:
4566bf27	260	case NFT_META_L4PROTO:
45d9bcda	261	case NFT_META_LEN:
96518518 PM	262	case NFT_META_PRIORITY:
	263	case NFT_META_MARK:
	264	case NFT_META_IIF:
	265	case NFT_META_OIF:
96518518 PM	266	case NFT_META_SKUID:
96518518 PM	267	case NFT_META_SKGID:
06efbd6d	268	#ifdef CONFIG_IP_ROUTE_CLASSID
96518518 PM	269	case NFT_META_RTCLASSID:
	270	#endif
	271	#ifdef CONFIG_NETWORK_SECMARK
	272	case NFT_META_SECMARK:
	273	#endif
e2a093ff	274	case NFT_META_PKTTYPE:
afc5be30	275	case NFT_META_CPU:
3045d760 AR	276	case NFT_META_IIFGROUP:
3045d760 AR	277	case NFT_META_OIFGROUP:
e181a543	278	#ifdef CONFIG_CGROUP_NET_CLASSID
ce674173	279	case NFT_META_CGROUP:
e181a543	280	#endif
45d9bcda PM	281	len = sizeof(u32);
	282	break;
	283	case NFT_META_IIFNAME:
	284	case NFT_META_OIFNAME:
	285	len = IFNAMSIZ;
d2caa696	286	break;
b07edbe1 FW	287	case NFT_META_PRANDOM:
	288	prandom_init_once(&nft_prandom_state);
	289	len = sizeof(u32);
	290	break;
96518518 PM	291	default:
	292	return -EOPNOTSUPP;
	293	}
	294
b1c96ed3	295	priv->dreg = nft_parse_register(tb[NFTA_META_DREG]);
27e6d201 PM	296	return nft_validate_register_store(ctx, priv->dreg, NULL,
27e6d201 PM	297	NFT_DATA_VALUE, len);
e035b77a	298	}
aa45660c	299	EXPORT_SYMBOL_GPL(nft_meta_get_init);
e035b77a	300
b4aae759 FW	301	static int nft_meta_set_init_pkttype(const struct nft_ctx *ctx)
	302	{
	303	unsigned int hooks;
	304
	305	switch (ctx->afi->family) {
	306	case NFPROTO_BRIDGE:
	307	hooks = 1 << NF_BR_PRE_ROUTING;
	308	break;
	309	case NFPROTO_NETDEV:
	310	hooks = 1 << NF_NETDEV_INGRESS;
	311	break;
	312	default:
	313	return -EOPNOTSUPP;
	314	}
	315
	316	return nft_chain_validate_hooks(ctx->chain, hooks);
	317	}
	318
aa45660c TB	319	int nft_meta_set_init(const struct nft_ctx *ctx,
	320	const struct nft_expr *expr,
	321	const struct nlattr * const tb[])
e035b77a ABG	322	{
e035b77a ABG	323	struct nft_meta *priv = nft_expr_priv(expr);
d07db988	324	unsigned int len;
e035b77a ABG	325	int err;
	326
	327	priv->key = ntohl(nla_get_be32(tb[NFTA_META_KEY]));
d2caa696 PM	328	switch (priv->key) {
	329	case NFT_META_MARK:
	330	case NFT_META_PRIORITY:
d07db988 PM	331	len = sizeof(u32);
d07db988 PM	332	break;
d2caa696	333	case NFT_META_NFTRACE:
d07db988	334	len = sizeof(u8);
d2caa696	335	break;
b4aae759 FW	336	case NFT_META_PKTTYPE:
	337	err = nft_meta_set_init_pkttype(ctx);
	338	if (err)
	339	return err;
	340	len = sizeof(u8);
	341	break;
d2caa696 PM	342	default:
d2caa696 PM	343	return -EOPNOTSUPP;
e035b77a ABG	344	}
e035b77a ABG	345
b1c96ed3	346	priv->sreg = nft_parse_register(tb[NFTA_META_SREG]);
d07db988	347	err = nft_validate_register_load(priv->sreg, len);
b38895c5 PNA	348	if (err < 0)
b38895c5 PNA	349	return err;
e035b77a	350
e639f7ab FW	351	if (priv->key == NFT_META_NFTRACE)
	352	static_branch_inc(&nft_trace_enabled);
	353
e035b77a	354	return 0;
96518518	355	}
aa45660c	356	EXPORT_SYMBOL_GPL(nft_meta_set_init);
96518518	357
aa45660c TB	358	int nft_meta_get_dump(struct sk_buff *skb,
aa45660c TB	359	const struct nft_expr *expr)
96518518 PM	360	{
	361	const struct nft_meta *priv = nft_expr_priv(expr);
	362
e035b77a ABG	363	if (nla_put_be32(skb, NFTA_META_KEY, htonl(priv->key)))
e035b77a ABG	364	goto nla_put_failure;
b1c96ed3	365	if (nft_dump_register(skb, NFTA_META_DREG, priv->dreg))
96518518	366	goto nla_put_failure;
e035b77a ABG	367	return 0;
	368
	369	nla_put_failure:
	370	return -1;
	371	}
aa45660c	372	EXPORT_SYMBOL_GPL(nft_meta_get_dump);
e035b77a	373
aa45660c TB	374	int nft_meta_set_dump(struct sk_buff *skb,
aa45660c TB	375	const struct nft_expr *expr)
e035b77a ABG	376	{
	377	const struct nft_meta *priv = nft_expr_priv(expr);
	378
96518518 PM	379	if (nla_put_be32(skb, NFTA_META_KEY, htonl(priv->key)))
96518518 PM	380	goto nla_put_failure;
b1c96ed3	381	if (nft_dump_register(skb, NFTA_META_SREG, priv->sreg))
e035b77a ABG	382	goto nla_put_failure;
e035b77a ABG	383
96518518 PM	384	return 0;
	385
	386	nla_put_failure:
	387	return -1;
	388	}
aa45660c	389	EXPORT_SYMBOL_GPL(nft_meta_set_dump);
96518518	390
e639f7ab FW	391	void nft_meta_set_destroy(const struct nft_ctx *ctx,
	392	const struct nft_expr *expr)
	393	{
	394	const struct nft_meta *priv = nft_expr_priv(expr);
	395
	396	if (priv->key == NFT_META_NFTRACE)
	397	static_branch_dec(&nft_trace_enabled);
	398	}
	399	EXPORT_SYMBOL_GPL(nft_meta_set_destroy);
	400
ef1f7df9	401	static struct nft_expr_type nft_meta_type;
e035b77a	402	static const struct nft_expr_ops nft_meta_get_ops = {
ef1f7df9	403	.type = &nft_meta_type,
96518518	404	.size = NFT_EXPR_SIZE(sizeof(struct nft_meta)),
e035b77a	405	.eval = nft_meta_get_eval,
d2caa696	406	.init = nft_meta_get_init,
e035b77a	407	.dump = nft_meta_get_dump,
ef1f7df9 PM	408	};
ef1f7df9 PM	409
e035b77a ABG	410	static const struct nft_expr_ops nft_meta_set_ops = {
	411	.type = &nft_meta_type,
	412	.size = NFT_EXPR_SIZE(sizeof(struct nft_meta)),
	413	.eval = nft_meta_set_eval,
d2caa696	414	.init = nft_meta_set_init,
e639f7ab	415	.destroy = nft_meta_set_destroy,
e035b77a ABG	416	.dump = nft_meta_set_dump,
	417	};
	418
	419	static const struct nft_expr_ops *
	420	nft_meta_select_ops(const struct nft_ctx *ctx,
	421	const struct nlattr * const tb[])
	422	{
	423	if (tb[NFTA_META_KEY] == NULL)
	424	return ERR_PTR(-EINVAL);
	425
	426	if (tb[NFTA_META_DREG] && tb[NFTA_META_SREG])
	427	return ERR_PTR(-EINVAL);
	428
	429	if (tb[NFTA_META_DREG])
	430	return &nft_meta_get_ops;
	431
	432	if (tb[NFTA_META_SREG])
	433	return &nft_meta_set_ops;
	434
	435	return ERR_PTR(-EINVAL);
	436	}
	437
ef1f7df9 PM	438	static struct nft_expr_type nft_meta_type __read_mostly = {
ef1f7df9 PM	439	.name = "meta",
e035b77a	440	.select_ops = &nft_meta_select_ops,
96518518 PM	441	.policy = nft_meta_policy,
96518518 PM	442	.maxattr = NFTA_META_MAX,
ef1f7df9	443	.owner = THIS_MODULE,
96518518 PM	444	};
	445
	446	static int __init nft_meta_module_init(void)
	447	{
ef1f7df9	448	return nft_register_expr(&nft_meta_type);
96518518 PM	449	}
	450
	451	static void __exit nft_meta_module_exit(void)
	452	{
ef1f7df9	453	nft_unregister_expr(&nft_meta_type);
96518518 PM	454	}
	455
	456	module_init(nft_meta_module_init);
	457	module_exit(nft_meta_module_exit);
	458
	459	MODULE_LICENSE("GPL");
	460	MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
	461	MODULE_ALIAS_NFT_EXPR("meta");