[linux-block.git] / net / netfilter / nft_meta.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (c) 2008-2009 Patrick McHardy <kaber@trash.net>
 * Copyright (c) 2014 Intel Corporation
 * Author: Tomasz Bursztyka <tomasz.bursztyka@linux.intel.com>
 *
 * Development of this code funded by Astaro AG (http://www.astaro.com/)
 */

#include <linux/kernel.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 <net/netfilter/nf_tables_offload.h>

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

#define NFT_META_SECS_PER_MINUTE	60
#define NFT_META_SECS_PER_HOUR		3600
#define NFT_META_SECS_PER_DAY		86400
#define NFT_META_DAYS_PER_WEEK		7

static DEFINE_PER_CPU(struct rnd_state, nft_prandom_state);

static u8 nft_meta_weekday(unsigned long secs)
{
	unsigned int dse;
	u8 wday;

	secs -= NFT_META_SECS_PER_MINUTE * sys_tz.tz_minuteswest;
	dse = secs / NFT_META_SECS_PER_DAY;
	wday = (4 + dse) % NFT_META_DAYS_PER_WEEK;

	return wday;
}

static u32 nft_meta_hour(unsigned long secs)
{
	struct tm tm;

	time64_to_tm(secs, 0, &tm);

	return tm.tm_hour * NFT_META_SECS_PER_HOUR
		+ tm.tm_min * NFT_META_SECS_PER_MINUTE
		+ tm.tm_sec;
}

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 = nft_in(pkt), *out = nft_out(pkt);
	struct sock *sk;
	u32 *dest = &regs->data[priv->dreg];

	switch (priv->key) {
	case NFT_META_LEN:
		*dest = skb->len;
		break;
	case NFT_META_PROTOCOL:
		nft_reg_store16(dest, (__force u16)skb->protocol);
		break;
	case NFT_META_NFPROTO:
		nft_reg_store8(dest, nft_pf(pkt));
		break;
	case NFT_META_L4PROTO:
		if (!pkt->tprot_set)
			goto err;
		nft_reg_store8(dest, pkt->tprot);
		break;
	case NFT_META_PRIORITY:
		*dest = skb->priority;
		break;
	case NFT_META_MARK:
		*dest = skb->mark;
		break;
	case NFT_META_IIF:
		*dest = in ? in->ifindex : 0;
		break;
	case NFT_META_OIF:
		*dest = out ? out->ifindex : 0;
		break;
	case NFT_META_IIFNAME:
		strncpy((char *)dest, in ? in->name : "", IFNAMSIZ);
		break;
	case NFT_META_OIFNAME:
		strncpy((char *)dest, out ? out->name : "", IFNAMSIZ);
		break;
	case NFT_META_IIFTYPE:
		if (in == NULL)
			goto err;
		nft_reg_store16(dest, in->type);
		break;
	case NFT_META_OIFTYPE:
		if (out == NULL)
			goto err;
		nft_reg_store16(dest, out->type);
		break;
	case NFT_META_SKUID:
		sk = skb_to_full_sk(skb);
		if (!sk || !sk_fullsock(sk) ||
		    !net_eq(nft_net(pkt), sock_net(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) ||
		    !net_eq(nft_net(pkt), sock_net(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) {
			nft_reg_store8(dest, skb->pkt_type);
			break;
		}

		switch (nft_pf(pkt)) {
		case NFPROTO_IPV4:
			if (ipv4_is_multicast(ip_hdr(skb)->daddr))
				nft_reg_store8(dest, PACKET_MULTICAST);
			else
				nft_reg_store8(dest, PACKET_BROADCAST);
			break;
		case NFPROTO_IPV6:
			nft_reg_store8(dest, PACKET_MULTICAST);
			break;
		case NFPROTO_NETDEV:
			switch (skb->protocol) {
			case htons(ETH_P_IP): {
				int noff = skb_network_offset(skb);
				struct iphdr *iph, _iph;

				iph = skb_header_pointer(skb, noff,
							 sizeof(_iph), &_iph);
				if (!iph)
					goto err;

				if (ipv4_is_multicast(iph->daddr))
					nft_reg_store8(dest, PACKET_MULTICAST);
				else
					nft_reg_store8(dest, PACKET_BROADCAST);

				break;
			}
			case htons(ETH_P_IPV6):
				nft_reg_store8(dest, PACKET_MULTICAST);
				break;
			default:
				WARN_ON_ONCE(1);
				goto err;
			}
			break;
		default:
			WARN_ON_ONCE(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) ||
		    !net_eq(nft_net(pkt), sock_net(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;
	}
#ifdef CONFIG_XFRM
	case NFT_META_SECPATH:
		nft_reg_store8(dest, secpath_exists(skb));
		break;
#endif
	case NFT_META_IIFKIND:
		if (in == NULL || in->rtnl_link_ops == NULL)
			goto err;
		strncpy((char *)dest, in->rtnl_link_ops->kind, IFNAMSIZ);
		break;
	case NFT_META_OIFKIND:
		if (out == NULL || out->rtnl_link_ops == NULL)
			goto err;
		strncpy((char *)dest, out->rtnl_link_ops->kind, IFNAMSIZ);
		break;
	case NFT_META_TIME_NS:
		nft_reg_store64(dest, ktime_get_real_ns());
		break;
	case NFT_META_TIME_DAY:
		nft_reg_store8(dest, nft_meta_weekday(get_seconds()));
		break;
	case NFT_META_TIME_HOUR:
		*dest = nft_meta_hour(get_seconds());
		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 *sreg = &regs->data[meta->sreg];
	u32 value = *sreg;
	u8 value8;

	switch (meta->key) {
	case NFT_META_MARK:
		skb->mark = value;
		break;
	case NFT_META_PRIORITY:
		skb->priority = value;
		break;
	case NFT_META_PKTTYPE:
		value8 = nft_reg_load8(sreg);

		if (skb->pkt_type != value8 &&
		    skb_pkt_type_ok(value8) &&
		    skb_pkt_type_ok(skb->pkt_type))
			skb->pkt_type = value8;
		break;
	case NFT_META_NFTRACE:
		value8 = nft_reg_load8(sreg);

		skb->nf_trace = !!value8;
		break;
#ifdef CONFIG_NETWORK_SECMARK
	case NFT_META_SECMARK:
		skb->secmark = value;
		break;
#endif
	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:
	case NFT_META_IIFKIND:
	case NFT_META_OIFKIND:
		len = IFNAMSIZ;
		break;
	case NFT_META_PRANDOM:
		prandom_init_once(&nft_prandom_state);
		len = sizeof(u32);
		break;
#ifdef CONFIG_XFRM
	case NFT_META_SECPATH:
		len = sizeof(u8);
		break;
#endif
	case NFT_META_TIME_NS:
		len = sizeof(u64);
		break;
	case NFT_META_TIME_DAY:
		len = sizeof(u8);
		break;
	case NFT_META_TIME_HOUR:
		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_get_validate(const struct nft_ctx *ctx,
				 const struct nft_expr *expr,
				 const struct nft_data **data)
{
#ifdef CONFIG_XFRM
	const struct nft_meta *priv = nft_expr_priv(expr);
	unsigned int hooks;

	if (priv->key != NFT_META_SECPATH)
		return 0;

	switch (ctx->family) {
	case NFPROTO_NETDEV:
		hooks = 1 << NF_NETDEV_INGRESS;
		break;
	case NFPROTO_IPV4:
	case NFPROTO_IPV6:
	case NFPROTO_INET:
		hooks = (1 << NF_INET_PRE_ROUTING) |
			(1 << NF_INET_LOCAL_IN) |
			(1 << NF_INET_FORWARD);
		break;
	default:
		return -EOPNOTSUPP;
	}

	return nft_chain_validate_hooks(ctx->chain, hooks);
#else
	return 0;
#endif
}

int nft_meta_set_validate(const struct nft_ctx *ctx,
			  const struct nft_expr *expr,
			  const struct nft_data **data)
{
	struct nft_meta *priv = nft_expr_priv(expr);
	unsigned int hooks;

	if (priv->key != NFT_META_PKTTYPE)
		return 0;

	switch (ctx->family) {
	case NFPROTO_BRIDGE:
		hooks = 1 << NF_BR_PRE_ROUTING;
		break;
	case NFPROTO_NETDEV:
		hooks = 1 << NF_NETDEV_INGRESS;
		break;
	case NFPROTO_IPV4:
	case NFPROTO_IPV6:
	case NFPROTO_INET:
		hooks = 1 << NF_INET_PRE_ROUTING;
		break;
	default:
		return -EOPNOTSUPP;
	}

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

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:
#ifdef CONFIG_NETWORK_SECMARK
	case NFT_META_SECMARK:
#endif
		len = sizeof(u32);
		break;
	case NFT_META_NFTRACE:
		len = sizeof(u8);
		break;
	case NFT_META_PKTTYPE:
		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 int nft_meta_get_offload(struct nft_offload_ctx *ctx,
				struct nft_flow_rule *flow,
				const struct nft_expr *expr)
{
	const struct nft_meta *priv = nft_expr_priv(expr);
	struct nft_offload_reg *reg = &ctx->regs[priv->dreg];

	switch (priv->key) {
	case NFT_META_PROTOCOL:
		NFT_OFFLOAD_MATCH(FLOW_DISSECTOR_KEY_BASIC, basic, n_proto,
				  sizeof(__u16), reg);
		nft_offload_set_dependency(ctx, NFT_OFFLOAD_DEP_NETWORK);
		break;
	case NFT_META_L4PROTO:
		NFT_OFFLOAD_MATCH(FLOW_DISSECTOR_KEY_BASIC, basic, ip_proto,
				  sizeof(__u8), reg);
		nft_offload_set_dependency(ctx, NFT_OFFLOAD_DEP_TRANSPORT);
		break;
	default:
		return -EOPNOTSUPP;
	}

	return 0;
}

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,
	.validate	= nft_meta_get_validate,
	.offload	= nft_meta_get_offload,
};

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,
	.validate	= nft_meta_set_validate,
};

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 IS_ENABLED(CONFIG_NF_TABLES_BRIDGE) && IS_MODULE(CONFIG_NFT_BRIDGE_META)
	if (ctx->family == NFPROTO_BRIDGE)
		return ERR_PTR(-EAGAIN);
#endif
	if (tb[NFTA_META_DREG])
		return &nft_meta_get_ops;

	if (tb[NFTA_META_SREG])
		return &nft_meta_set_ops;

	return ERR_PTR(-EINVAL);
}

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,
};

#ifdef CONFIG_NETWORK_SECMARK
struct nft_secmark {
	u32 secid;
	char *ctx;
};

static const struct nla_policy nft_secmark_policy[NFTA_SECMARK_MAX + 1] = {
	[NFTA_SECMARK_CTX]     = { .type = NLA_STRING, .len = NFT_SECMARK_CTX_MAXLEN },
};

static int nft_secmark_compute_secid(struct nft_secmark *priv)
{
	u32 tmp_secid = 0;
	int err;

	err = security_secctx_to_secid(priv->ctx, strlen(priv->ctx), &tmp_secid);
	if (err)
		return err;

	if (!tmp_secid)
		return -ENOENT;

	err = security_secmark_relabel_packet(tmp_secid);
	if (err)
		return err;

	priv->secid = tmp_secid;
	return 0;
}

static void nft_secmark_obj_eval(struct nft_object *obj, struct nft_regs *regs,
				 const struct nft_pktinfo *pkt)
{
	const struct nft_secmark *priv = nft_obj_data(obj);
	struct sk_buff *skb = pkt->skb;

	skb->secmark = priv->secid;
}

static int nft_secmark_obj_init(const struct nft_ctx *ctx,
				const struct nlattr * const tb[],
				struct nft_object *obj)
{
	struct nft_secmark *priv = nft_obj_data(obj);
	int err;

	if (tb[NFTA_SECMARK_CTX] == NULL)
		return -EINVAL;

	priv->ctx = nla_strdup(tb[NFTA_SECMARK_CTX], GFP_KERNEL);
	if (!priv->ctx)
		return -ENOMEM;

	err = nft_secmark_compute_secid(priv);
	if (err) {
		kfree(priv->ctx);
		return err;
	}

	security_secmark_refcount_inc();

	return 0;
}

static int nft_secmark_obj_dump(struct sk_buff *skb, struct nft_object *obj,
				bool reset)
{
	struct nft_secmark *priv = nft_obj_data(obj);
	int err;

	if (nla_put_string(skb, NFTA_SECMARK_CTX, priv->ctx))
		return -1;

	if (reset) {
		err = nft_secmark_compute_secid(priv);
		if (err)
			return err;
	}

	return 0;
}

static void nft_secmark_obj_destroy(const struct nft_ctx *ctx, struct nft_object *obj)
{
	struct nft_secmark *priv = nft_obj_data(obj);

	security_secmark_refcount_dec();

	kfree(priv->ctx);
}

static const struct nft_object_ops nft_secmark_obj_ops = {
	.type		= &nft_secmark_obj_type,
	.size		= sizeof(struct nft_secmark),
	.init		= nft_secmark_obj_init,
	.eval		= nft_secmark_obj_eval,
	.dump		= nft_secmark_obj_dump,
	.destroy	= nft_secmark_obj_destroy,
};
struct nft_object_type nft_secmark_obj_type __read_mostly = {
	.type		= NFT_OBJECT_SECMARK,
	.ops		= &nft_secmark_obj_ops,
	.maxattr	= NFTA_SECMARK_MAX,
	.policy		= nft_secmark_policy,
	.owner		= THIS_MODULE,
};
#endif /* CONFIG_NETWORK_SECMARK */
Commit	Line	Data
d2912cb1	1	// SPDX-License-Identifier: GPL-2.0-only
96518518	2	/*
ef1f7df9	3	* Copyright (c) 2008-2009 Patrick McHardy <kaber@trash.net>
bd2bbdb4 FW	4	* Copyright (c) 2014 Intel Corporation
bd2bbdb4 FW	5	* Author: Tomasz Bursztyka <tomasz.bursztyka@linux.intel.com>
96518518	6	*
96518518 PM	7	* Development of this code funded by Astaro AG (http://www.astaro.com/)
	8	*/
	9
	10	#include <linux/kernel.h>
96518518 PM	11	#include <linux/netlink.h>
	12	#include <linux/netfilter.h>
	13	#include <linux/netfilter/nf_tables.h>
e2a093ff AR	14	#include <linux/in.h>
	15	#include <linux/ip.h>
	16	#include <linux/ipv6.h>
afc5be30	17	#include <linux/smp.h>
e639f7ab	18	#include <linux/static_key.h>
96518518 PM	19	#include <net/dst.h>
	20	#include <net/sock.h>
	21	#include <net/tcp_states.h> /* for TCP_TIME_WAIT */
	22	#include <net/netfilter/nf_tables.h>
e639f7ab	23	#include <net/netfilter/nf_tables_core.h>
30e103fe	24	#include <net/netfilter/nft_meta.h>
c9626a2c	25	#include <net/netfilter/nf_tables_offload.h>
96518518	26
b4aae759 FW	27	#include <uapi/linux/netfilter_bridge.h> /* NF_BR_PRE_ROUTING */
b4aae759 FW	28
63d10e12 AJ	29	#define NFT_META_SECS_PER_MINUTE 60
	30	#define NFT_META_SECS_PER_HOUR 3600
	31	#define NFT_META_SECS_PER_DAY 86400
	32	#define NFT_META_DAYS_PER_WEEK 7
	33
b07edbe1 FW	34	static DEFINE_PER_CPU(struct rnd_state, nft_prandom_state);
b07edbe1 FW	35
63d10e12 AJ	36	static u8 nft_meta_weekday(unsigned long secs)
	37	{
	38	unsigned int dse;
	39	u8 wday;
	40
	41	secs -= NFT_META_SECS_PER_MINUTE * sys_tz.tz_minuteswest;
	42	dse = secs / NFT_META_SECS_PER_DAY;
	43	wday = (4 + dse) % NFT_META_DAYS_PER_WEEK;
	44
	45	return wday;
	46	}
	47
	48	static u32 nft_meta_hour(unsigned long secs)
	49	{
	50	struct tm tm;
	51
	52	time64_to_tm(secs, 0, &tm);
	53
	54	return tm.tm_hour * NFT_META_SECS_PER_HOUR
	55	+ tm.tm_min * NFT_META_SECS_PER_MINUTE
	56	+ tm.tm_sec;
	57	}
	58
222440b4 FW	59	void nft_meta_get_eval(const struct nft_expr *expr,
	60	struct nft_regs *regs,
	61	const struct nft_pktinfo *pkt)
96518518 PM	62	{
	63	const struct nft_meta *priv = nft_expr_priv(expr);
	64	const struct sk_buff *skb = pkt->skb;
0e5a1c7e	65	const struct net_device in = nft_in(pkt), out = nft_out(pkt);
3aed8225	66	struct sock *sk;
49499c3e	67	u32 *dest = &regs->data[priv->dreg];
96518518 PM	68
	69	switch (priv->key) {
	70	case NFT_META_LEN:
fad136ea	71	*dest = skb->len;
96518518 PM	72	break;
96518518 PM	73	case NFT_META_PROTOCOL:
10596608	74	nft_reg_store16(dest, (__force u16)skb->protocol);
96518518	75	break;
124edfa9	76	case NFT_META_NFPROTO:
10596608	77	nft_reg_store8(dest, nft_pf(pkt));
124edfa9	78	break;
4566bf27	79	case NFT_META_L4PROTO:
beac5afa PNA	80	if (!pkt->tprot_set)
beac5afa PNA	81	goto err;
10596608	82	nft_reg_store8(dest, pkt->tprot);
4566bf27	83	break;
96518518	84	case NFT_META_PRIORITY:
fad136ea	85	*dest = skb->priority;
96518518 PM	86	break;
96518518 PM	87	case NFT_META_MARK:
fad136ea	88	*dest = skb->mark;
96518518 PM	89	break;
96518518 PM	90	case NFT_META_IIF:
cb81572e	91	*dest = in ? in->ifindex : 0;
96518518 PM	92	break;
96518518 PM	93	case NFT_META_OIF:
cb81572e	94	*dest = out ? out->ifindex : 0;
96518518 PM	95	break;
96518518 PM	96	case NFT_META_IIFNAME:
cb81572e	97	strncpy((char *)dest, in ? in->name : "", IFNAMSIZ);
96518518 PM	98	break;
96518518 PM	99	case NFT_META_OIFNAME:
cb81572e	100	strncpy((char *)dest, out ? out->name : "", IFNAMSIZ);
96518518 PM	101	break;
	102	case NFT_META_IIFTYPE:
	103	if (in == NULL)
	104	goto err;
10596608	105	nft_reg_store16(dest, in->type);
96518518 PM	106	break;
	107	case NFT_META_OIFTYPE:
	108	if (out == NULL)
	109	goto err;
10596608	110	nft_reg_store16(dest, out->type);
96518518 PM	111	break;
96518518 PM	112	case NFT_META_SKUID:
3aed8225	113	sk = skb_to_full_sk(skb);
f5646501 FL	114	if (!sk \|\| !sk_fullsock(sk) \|\|
f5646501 FL	115	!net_eq(nft_net(pkt), sock_net(sk)))
96518518 PM	116	goto err;
96518518 PM	117
3aed8225 ED	118	read_lock_bh(&sk->sk_callback_lock);
	119	if (sk->sk_socket == NULL \|\|
	120	sk->sk_socket->file == NULL) {
	121	read_unlock_bh(&sk->sk_callback_lock);
96518518 PM	122	goto err;
	123	}
	124
fad136ea	125	*dest = from_kuid_munged(&init_user_ns,
3aed8225 ED	126	sk->sk_socket->file->f_cred->fsuid);
3aed8225 ED	127	read_unlock_bh(&sk->sk_callback_lock);
96518518 PM	128	break;
96518518 PM	129	case NFT_META_SKGID:
3aed8225	130	sk = skb_to_full_sk(skb);
f5646501 FL	131	if (!sk \|\| !sk_fullsock(sk) \|\|
f5646501 FL	132	!net_eq(nft_net(pkt), sock_net(sk)))
96518518 PM	133	goto err;
96518518 PM	134
3aed8225 ED	135	read_lock_bh(&sk->sk_callback_lock);
	136	if (sk->sk_socket == NULL \|\|
	137	sk->sk_socket->file == NULL) {
	138	read_unlock_bh(&sk->sk_callback_lock);
96518518 PM	139	goto err;
96518518 PM	140	}
fad136ea	141	*dest = from_kgid_munged(&init_user_ns,
3aed8225 ED	142	sk->sk_socket->file->f_cred->fsgid);
3aed8225 ED	143	read_unlock_bh(&sk->sk_callback_lock);
96518518	144	break;
06efbd6d	145	#ifdef CONFIG_IP_ROUTE_CLASSID
96518518 PM	146	case NFT_META_RTCLASSID: {
	147	const struct dst_entry *dst = skb_dst(skb);
	148
	149	if (dst == NULL)
	150	goto err;
fad136ea	151	*dest = dst->tclassid;
96518518 PM	152	break;
	153	}
	154	#endif
	155	#ifdef CONFIG_NETWORK_SECMARK
	156	case NFT_META_SECMARK:
fad136ea	157	*dest = skb->secmark;
96518518 PM	158	break;
96518518 PM	159	#endif
e2a093ff AR	160	case NFT_META_PKTTYPE:
e2a093ff AR	161	if (skb->pkt_type != PACKET_LOOPBACK) {
10596608	162	nft_reg_store8(dest, skb->pkt_type);
e2a093ff AR	163	break;
	164	}
	165
0e5a1c7e	166	switch (nft_pf(pkt)) {
e2a093ff AR	167	case NFPROTO_IPV4:
e2a093ff AR	168	if (ipv4_is_multicast(ip_hdr(skb)->daddr))
10596608	169	nft_reg_store8(dest, PACKET_MULTICAST);
e2a093ff	170	else
10596608	171	nft_reg_store8(dest, PACKET_BROADCAST);
e2a093ff AR	172	break;
e2a093ff AR	173	case NFPROTO_IPV6:
10596608	174	nft_reg_store8(dest, PACKET_MULTICAST);
e2a093ff	175	break;
f169fd69 LZ	176	case NFPROTO_NETDEV:
	177	switch (skb->protocol) {
	178	case htons(ETH_P_IP): {
	179	int noff = skb_network_offset(skb);
	180	struct iphdr *iph, _iph;
	181
	182	iph = skb_header_pointer(skb, noff,
	183	sizeof(_iph), &_iph);
	184	if (!iph)
	185	goto err;
	186
	187	if (ipv4_is_multicast(iph->daddr))
10596608	188	nft_reg_store8(dest, PACKET_MULTICAST);
f169fd69	189	else
10596608	190	nft_reg_store8(dest, PACKET_BROADCAST);
f169fd69 LZ	191
	192	break;
	193	}
	194	case htons(ETH_P_IPV6):
10596608	195	nft_reg_store8(dest, PACKET_MULTICAST);
f169fd69 LZ	196	break;
	197	default:
	198	WARN_ON_ONCE(1);
	199	goto err;
	200	}
	201	break;
e2a093ff	202	default:
f169fd69	203	WARN_ON_ONCE(1);
e2a093ff AR	204	goto err;
	205	}
	206	break;
afc5be30	207	case NFT_META_CPU:
fad136ea	208	*dest = raw_smp_processor_id();
afc5be30	209	break;
3045d760 AR	210	case NFT_META_IIFGROUP:
	211	if (in == NULL)
	212	goto err;
fad136ea	213	*dest = in->group;
3045d760 AR	214	break;
	215	case NFT_META_OIFGROUP:
	216	if (out == NULL)
	217	goto err;
fad136ea	218	*dest = out->group;
3045d760	219	break;
e181a543	220	#ifdef CONFIG_CGROUP_NET_CLASSID
ce674173	221	case NFT_META_CGROUP:
3aed8225	222	sk = skb_to_full_sk(skb);
f5646501 FL	223	if (!sk \|\| !sk_fullsock(sk) \|\|
f5646501 FL	224	!net_eq(nft_net(pkt), sock_net(sk)))
c5035c77	225	goto err;
2a56a1fe	226	*dest = sock_cgroup_classid(&sk->sk_cgrp_data);
ce674173	227	break;
e181a543	228	#endif
b07edbe1 FW	229	case NFT_META_PRANDOM: {
	230	struct rnd_state *state = this_cpu_ptr(&nft_prandom_state);
	231	*dest = prandom_u32_state(state);
	232	break;
	233	}
f6931f5f FW	234	#ifdef CONFIG_XFRM
f6931f5f FW	235	case NFT_META_SECPATH:
7af8f4ca	236	nft_reg_store8(dest, secpath_exists(skb));
f6931f5f FW	237	break;
f6931f5f FW	238	#endif
0fb4d219	239	case NFT_META_IIFKIND:
	240	if (in == NULL \|\| in->rtnl_link_ops == NULL)
	241	goto err;
	242	strncpy((char *)dest, in->rtnl_link_ops->kind, IFNAMSIZ);
	243	break;
	244	case NFT_META_OIFKIND:
	245	if (out == NULL \|\| out->rtnl_link_ops == NULL)
	246	goto err;
	247	strncpy((char *)dest, out->rtnl_link_ops->kind, IFNAMSIZ);
	248	break;
63d10e12 AJ	249	case NFT_META_TIME_NS:
	250	nft_reg_store64(dest, ktime_get_real_ns());
	251	break;
	252	case NFT_META_TIME_DAY:
	253	nft_reg_store8(dest, nft_meta_weekday(get_seconds()));
	254	break;
	255	case NFT_META_TIME_HOUR:
	256	*dest = nft_meta_hour(get_seconds());
	257	break;
96518518 PM	258	default:
	259	WARN_ON(1);
	260	goto err;
	261	}
	262	return;
	263
	264	err:
a55e22e9	265	regs->verdict.code = NFT_BREAK;
96518518	266	}
30e103fe	267	EXPORT_SYMBOL_GPL(nft_meta_get_eval);
96518518	268
30e103fe	269	void nft_meta_set_eval(const struct nft_expr *expr,
	270	struct nft_regs *regs,
	271	const struct nft_pktinfo *pkt)
e035b77a ABG	272	{
	273	const struct nft_meta *meta = nft_expr_priv(expr);
	274	struct sk_buff *skb = pkt->skb;
10596608 LZ	275	u32 *sreg = &regs->data[meta->sreg];
10596608 LZ	276	u32 value = *sreg;
97a0549b	277	u8 value8;
e035b77a ABG	278
	279	switch (meta->key) {
	280	case NFT_META_MARK:
	281	skb->mark = value;
	282	break;
	283	case NFT_META_PRIORITY:
	284	skb->priority = value;
	285	break;
b4aae759	286	case NFT_META_PKTTYPE:
97a0549b	287	value8 = nft_reg_load8(sreg);
10596608	288
97a0549b TY	289	if (skb->pkt_type != value8 &&
97a0549b TY	290	skb_pkt_type_ok(value8) &&
10596608	291	skb_pkt_type_ok(skb->pkt_type))
97a0549b	292	skb->pkt_type = value8;
b4aae759	293	break;
e035b77a	294	case NFT_META_NFTRACE:
97a0549b TY	295	value8 = nft_reg_load8(sreg);
	296
	297	skb->nf_trace = !!value8;
e035b77a	298	break;
b473a1f5 CG	299	#ifdef CONFIG_NETWORK_SECMARK
	300	case NFT_META_SECMARK:
	301	skb->secmark = value;
	302	break;
	303	#endif
e035b77a ABG	304	default:
	305	WARN_ON(1);
	306	}
	307	}
30e103fe	308	EXPORT_SYMBOL_GPL(nft_meta_set_eval);
e035b77a	309
30e103fe	310	const struct nla_policy nft_meta_policy[NFTA_META_MAX + 1] = {
96518518 PM	311	[NFTA_META_DREG] = { .type = NLA_U32 },
96518518 PM	312	[NFTA_META_KEY] = { .type = NLA_U32 },
e035b77a	313	[NFTA_META_SREG] = { .type = NLA_U32 },
96518518	314	};
30e103fe	315	EXPORT_SYMBOL_GPL(nft_meta_policy);
96518518	316
30e103fe	317	int nft_meta_get_init(const struct nft_ctx *ctx,
	318	const struct nft_expr *expr,
	319	const struct nlattr * const tb[])
96518518	320	{
d2caa696	321	struct nft_meta *priv = nft_expr_priv(expr);
45d9bcda	322	unsigned int len;
96518518	323
d2caa696 PM	324	priv->key = ntohl(nla_get_be32(tb[NFTA_META_KEY]));
d2caa696 PM	325	switch (priv->key) {
96518518	326	case NFT_META_PROTOCOL:
45d9bcda PM	327	case NFT_META_IIFTYPE:
	328	case NFT_META_OIFTYPE:
	329	len = sizeof(u16);
	330	break;
124edfa9	331	case NFT_META_NFPROTO:
4566bf27	332	case NFT_META_L4PROTO:
45d9bcda	333	case NFT_META_LEN:
96518518 PM	334	case NFT_META_PRIORITY:
	335	case NFT_META_MARK:
	336	case NFT_META_IIF:
	337	case NFT_META_OIF:
96518518 PM	338	case NFT_META_SKUID:
96518518 PM	339	case NFT_META_SKGID:
06efbd6d	340	#ifdef CONFIG_IP_ROUTE_CLASSID
96518518 PM	341	case NFT_META_RTCLASSID:
	342	#endif
	343	#ifdef CONFIG_NETWORK_SECMARK
	344	case NFT_META_SECMARK:
	345	#endif
e2a093ff	346	case NFT_META_PKTTYPE:
afc5be30	347	case NFT_META_CPU:
3045d760 AR	348	case NFT_META_IIFGROUP:
3045d760 AR	349	case NFT_META_OIFGROUP:
e181a543	350	#ifdef CONFIG_CGROUP_NET_CLASSID
ce674173	351	case NFT_META_CGROUP:
e181a543	352	#endif
45d9bcda PM	353	len = sizeof(u32);
	354	break;
	355	case NFT_META_IIFNAME:
	356	case NFT_META_OIFNAME:
0fb4d219	357	case NFT_META_IIFKIND:
0fb4d219	358	case NFT_META_OIFKIND:
45d9bcda	359	len = IFNAMSIZ;
d2caa696	360	break;
b07edbe1 FW	361	case NFT_META_PRANDOM:
	362	prandom_init_once(&nft_prandom_state);
	363	len = sizeof(u32);
	364	break;
f6931f5f FW	365	#ifdef CONFIG_XFRM
	366	case NFT_META_SECPATH:
	367	len = sizeof(u8);
	368	break;
	369	#endif
63d10e12 AJ	370	case NFT_META_TIME_NS:
	371	len = sizeof(u64);
	372	break;
	373	case NFT_META_TIME_DAY:
	374	len = sizeof(u8);
	375	break;
	376	case NFT_META_TIME_HOUR:
	377	len = sizeof(u32);
	378	break;
96518518 PM	379	default:
	380	return -EOPNOTSUPP;
	381	}
	382
b1c96ed3	383	priv->dreg = nft_parse_register(tb[NFTA_META_DREG]);
27e6d201 PM	384	return nft_validate_register_store(ctx, priv->dreg, NULL,
27e6d201 PM	385	NFT_DATA_VALUE, len);
e035b77a	386	}
30e103fe	387	EXPORT_SYMBOL_GPL(nft_meta_get_init);
e035b77a	388
f6931f5f FW	389	static int nft_meta_get_validate(const struct nft_ctx *ctx,
	390	const struct nft_expr *expr,
	391	const struct nft_data **data)
	392	{
	393	#ifdef CONFIG_XFRM
	394	const struct nft_meta *priv = nft_expr_priv(expr);
	395	unsigned int hooks;
	396
	397	if (priv->key != NFT_META_SECPATH)
	398	return 0;
	399
36596dad	400	switch (ctx->family) {
f6931f5f FW	401	case NFPROTO_NETDEV:
	402	hooks = 1 << NF_NETDEV_INGRESS;
	403	break;
	404	case NFPROTO_IPV4:
	405	case NFPROTO_IPV6:
	406	case NFPROTO_INET:
	407	hooks = (1 << NF_INET_PRE_ROUTING) \|
	408	(1 << NF_INET_LOCAL_IN) \|
	409	(1 << NF_INET_FORWARD);
	410	break;
	411	default:
	412	return -EOPNOTSUPP;
	413	}
	414
	415	return nft_chain_validate_hooks(ctx->chain, hooks);
	416	#else
	417	return 0;
	418	#endif
	419	}
	420
30e103fe	421	int nft_meta_set_validate(const struct nft_ctx *ctx,
	422	const struct nft_expr *expr,
	423	const struct nft_data **data)
b4aae759	424	{
960fa72f	425	struct nft_meta *priv = nft_expr_priv(expr);
b4aae759 FW	426	unsigned int hooks;
b4aae759 FW	427
960fa72f LZ	428	if (priv->key != NFT_META_PKTTYPE)
	429	return 0;
	430
36596dad	431	switch (ctx->family) {
b4aae759 FW	432	case NFPROTO_BRIDGE:
	433	hooks = 1 << NF_BR_PRE_ROUTING;
	434	break;
	435	case NFPROTO_NETDEV:
	436	hooks = 1 << NF_NETDEV_INGRESS;
	437	break;
96d9f2a7 LZ	438	case NFPROTO_IPV4:
	439	case NFPROTO_IPV6:
	440	case NFPROTO_INET:
	441	hooks = 1 << NF_INET_PRE_ROUTING;
	442	break;
b4aae759 FW	443	default:
	444	return -EOPNOTSUPP;
	445	}
	446
	447	return nft_chain_validate_hooks(ctx->chain, hooks);
	448	}
30e103fe	449	EXPORT_SYMBOL_GPL(nft_meta_set_validate);
b4aae759	450
30e103fe	451	int nft_meta_set_init(const struct nft_ctx *ctx,
	452	const struct nft_expr *expr,
	453	const struct nlattr * const tb[])
e035b77a ABG	454	{
e035b77a ABG	455	struct nft_meta *priv = nft_expr_priv(expr);
d07db988	456	unsigned int len;
e035b77a ABG	457	int err;
	458
	459	priv->key = ntohl(nla_get_be32(tb[NFTA_META_KEY]));
d2caa696 PM	460	switch (priv->key) {
	461	case NFT_META_MARK:
	462	case NFT_META_PRIORITY:
b473a1f5 CG	463	#ifdef CONFIG_NETWORK_SECMARK
	464	case NFT_META_SECMARK:
	465	#endif
d07db988 PM	466	len = sizeof(u32);
d07db988 PM	467	break;
d2caa696	468	case NFT_META_NFTRACE:
d07db988	469	len = sizeof(u8);
d2caa696	470	break;
b4aae759	471	case NFT_META_PKTTYPE:
b4aae759 FW	472	len = sizeof(u8);
b4aae759 FW	473	break;
d2caa696 PM	474	default:
d2caa696 PM	475	return -EOPNOTSUPP;
e035b77a ABG	476	}
e035b77a ABG	477
b1c96ed3	478	priv->sreg = nft_parse_register(tb[NFTA_META_SREG]);
d07db988	479	err = nft_validate_register_load(priv->sreg, len);
b38895c5 PNA	480	if (err < 0)
b38895c5 PNA	481	return err;
e035b77a	482
e639f7ab FW	483	if (priv->key == NFT_META_NFTRACE)
	484	static_branch_inc(&nft_trace_enabled);
	485
e035b77a	486	return 0;
96518518	487	}
30e103fe	488	EXPORT_SYMBOL_GPL(nft_meta_set_init);
96518518	489
30e103fe	490	int nft_meta_get_dump(struct sk_buff *skb,
30e103fe	491	const struct nft_expr *expr)
96518518 PM	492	{
	493	const struct nft_meta *priv = nft_expr_priv(expr);
	494
e035b77a ABG	495	if (nla_put_be32(skb, NFTA_META_KEY, htonl(priv->key)))
e035b77a ABG	496	goto nla_put_failure;
b1c96ed3	497	if (nft_dump_register(skb, NFTA_META_DREG, priv->dreg))
96518518	498	goto nla_put_failure;
e035b77a ABG	499	return 0;
	500
	501	nla_put_failure:
	502	return -1;
	503	}
30e103fe	504	EXPORT_SYMBOL_GPL(nft_meta_get_dump);
e035b77a	505
30e103fe	506	int nft_meta_set_dump(struct sk_buff skb, const struct nft_expr expr)
e035b77a ABG	507	{
	508	const struct nft_meta *priv = nft_expr_priv(expr);
	509
96518518 PM	510	if (nla_put_be32(skb, NFTA_META_KEY, htonl(priv->key)))
96518518 PM	511	goto nla_put_failure;
b1c96ed3	512	if (nft_dump_register(skb, NFTA_META_SREG, priv->sreg))
e035b77a ABG	513	goto nla_put_failure;
e035b77a ABG	514
96518518 PM	515	return 0;
	516
	517	nla_put_failure:
	518	return -1;
	519	}
30e103fe	520	EXPORT_SYMBOL_GPL(nft_meta_set_dump);
96518518	521
30e103fe	522	void nft_meta_set_destroy(const struct nft_ctx *ctx,
30e103fe	523	const struct nft_expr *expr)
e639f7ab FW	524	{
	525	const struct nft_meta *priv = nft_expr_priv(expr);
	526
	527	if (priv->key == NFT_META_NFTRACE)
	528	static_branch_dec(&nft_trace_enabled);
	529	}
30e103fe	530	EXPORT_SYMBOL_GPL(nft_meta_set_destroy);
e639f7ab	531
c9626a2c PNA	532	static int nft_meta_get_offload(struct nft_offload_ctx *ctx,
	533	struct nft_flow_rule *flow,
	534	const struct nft_expr *expr)
	535	{
	536	const struct nft_meta *priv = nft_expr_priv(expr);
	537	struct nft_offload_reg *reg = &ctx->regs[priv->dreg];
	538
	539	switch (priv->key) {
	540	case NFT_META_PROTOCOL:
	541	NFT_OFFLOAD_MATCH(FLOW_DISSECTOR_KEY_BASIC, basic, n_proto,
	542	sizeof(__u16), reg);
	543	nft_offload_set_dependency(ctx, NFT_OFFLOAD_DEP_NETWORK);
	544	break;
	545	case NFT_META_L4PROTO:
	546	NFT_OFFLOAD_MATCH(FLOW_DISSECTOR_KEY_BASIC, basic, ip_proto,
	547	sizeof(__u8), reg);
	548	nft_offload_set_dependency(ctx, NFT_OFFLOAD_DEP_TRANSPORT);
	549	break;
	550	default:
	551	return -EOPNOTSUPP;
	552	}
	553
	554	return 0;
	555	}
	556
e035b77a	557	static const struct nft_expr_ops nft_meta_get_ops = {
ef1f7df9	558	.type = &nft_meta_type,
96518518	559	.size = NFT_EXPR_SIZE(sizeof(struct nft_meta)),
e035b77a	560	.eval = nft_meta_get_eval,
d2caa696	561	.init = nft_meta_get_init,
e035b77a	562	.dump = nft_meta_get_dump,
f6931f5f	563	.validate = nft_meta_get_validate,
c9626a2c	564	.offload = nft_meta_get_offload,
ef1f7df9 PM	565	};
ef1f7df9 PM	566
e035b77a ABG	567	static const struct nft_expr_ops nft_meta_set_ops = {
	568	.type = &nft_meta_type,
	569	.size = NFT_EXPR_SIZE(sizeof(struct nft_meta)),
	570	.eval = nft_meta_set_eval,
d2caa696	571	.init = nft_meta_set_init,
e639f7ab	572	.destroy = nft_meta_set_destroy,
e035b77a	573	.dump = nft_meta_set_dump,
960fa72f	574	.validate = nft_meta_set_validate,
e035b77a ABG	575	};
	576
	577	static const struct nft_expr_ops *
	578	nft_meta_select_ops(const struct nft_ctx *ctx,
	579	const struct nlattr * const tb[])
	580	{
	581	if (tb[NFTA_META_KEY] == NULL)
	582	return ERR_PTR(-EINVAL);
	583
	584	if (tb[NFTA_META_DREG] && tb[NFTA_META_SREG])
	585	return ERR_PTR(-EINVAL);
	586
dfee0e99	587	#if IS_ENABLED(CONFIG_NF_TABLES_BRIDGE) && IS_MODULE(CONFIG_NFT_BRIDGE_META)
0ef1efd1 PNA	588	if (ctx->family == NFPROTO_BRIDGE)
	589	return ERR_PTR(-EAGAIN);
	590	#endif
e035b77a ABG	591	if (tb[NFTA_META_DREG])
	592	return &nft_meta_get_ops;
	593
	594	if (tb[NFTA_META_SREG])
	595	return &nft_meta_set_ops;
	596
	597	return ERR_PTR(-EINVAL);
	598	}
	599
8a22543c	600	struct nft_expr_type nft_meta_type __read_mostly = {
ef1f7df9	601	.name = "meta",
d4ef3835	602	.select_ops = nft_meta_select_ops,
96518518 PM	603	.policy = nft_meta_policy,
96518518 PM	604	.maxattr = NFTA_META_MAX,
ef1f7df9	605	.owner = THIS_MODULE,
96518518	606	};
fb961945 CG	607
	608	#ifdef CONFIG_NETWORK_SECMARK
	609	struct nft_secmark {
	610	u32 secid;
	611	char *ctx;
	612	};
	613
	614	static const struct nla_policy nft_secmark_policy[NFTA_SECMARK_MAX + 1] = {
	615	[NFTA_SECMARK_CTX] = { .type = NLA_STRING, .len = NFT_SECMARK_CTX_MAXLEN },
	616	};
	617
	618	static int nft_secmark_compute_secid(struct nft_secmark *priv)
	619	{
	620	u32 tmp_secid = 0;
	621	int err;
	622
	623	err = security_secctx_to_secid(priv->ctx, strlen(priv->ctx), &tmp_secid);
	624	if (err)
	625	return err;
	626
	627	if (!tmp_secid)
	628	return -ENOENT;
	629
	630	err = security_secmark_relabel_packet(tmp_secid);
	631	if (err)
	632	return err;
	633
	634	priv->secid = tmp_secid;
	635	return 0;
	636	}
	637
	638	static void nft_secmark_obj_eval(struct nft_object obj, struct nft_regs regs,
	639	const struct nft_pktinfo *pkt)
	640	{
	641	const struct nft_secmark *priv = nft_obj_data(obj);
	642	struct sk_buff *skb = pkt->skb;
	643
	644	skb->secmark = priv->secid;
	645	}
	646
	647	static int nft_secmark_obj_init(const struct nft_ctx *ctx,
	648	const struct nlattr * const tb[],
	649	struct nft_object *obj)
	650	{
	651	struct nft_secmark *priv = nft_obj_data(obj);
	652	int err;
	653
	654	if (tb[NFTA_SECMARK_CTX] == NULL)
	655	return -EINVAL;
	656
	657	priv->ctx = nla_strdup(tb[NFTA_SECMARK_CTX], GFP_KERNEL);
	658	if (!priv->ctx)
	659	return -ENOMEM;
	660
	661	err = nft_secmark_compute_secid(priv);
	662	if (err) {
	663	kfree(priv->ctx);
	664	return err;
	665	}
	666
	667	security_secmark_refcount_inc();
	668
	669	return 0;
	670	}
671
672	static int nft_secmark_obj_dump(struct sk_buff skb, struct nft_object obj,
673	bool reset)
674	{
675	struct nft_secmark *priv = nft_obj_data(obj);
676	int err;
677
678	if (nla_put_string(skb, NFTA_SECMARK_CTX, priv->ctx))
679	return -1;
680
681	if (reset) {
682	err = nft_secmark_compute_secid(priv);
683	if (err)
684	return err;
685	}
686
687	return 0;
688	}
689
690	static void nft_secmark_obj_destroy(const struct nft_ctx ctx, struct nft_object obj)
691	{
692	struct nft_secmark *priv = nft_obj_data(obj);
693
694	security_secmark_refcount_dec();
695
696	kfree(priv->ctx);
697	}
698
699	static const struct nft_object_ops nft_secmark_obj_ops = {
700	.type = &nft_secmark_obj_type,
701	.size = sizeof(struct nft_secmark),
702	.init = nft_secmark_obj_init,
703	.eval = nft_secmark_obj_eval,
704	.dump = nft_secmark_obj_dump,
705	.destroy = nft_secmark_obj_destroy,
706	};
707	struct nft_object_type nft_secmark_obj_type __read_mostly = {
708	.type = NFT_OBJECT_SECMARK,
709	.ops = &nft_secmark_obj_ops,
710	.maxattr = NFTA_SECMARK_MAX,
711	.policy = nft_secmark_policy,
712	.owner = THIS_MODULE,
713	};
714	#endif /* CONFIG_NETWORK_SECMARK */