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     ˆÃÄƒq·ZÂ¿Æ ®    /* SPDX-License-Identifier: GPL-2.0 */
#ifndef __NET_DST_METADATA_H
#define __NET_DST_METADATA_H 1

#include <linux/skbuff.h>
#include <net/ip_tunnels.h>
#include <net/macsec.h>
#include <net/dst.h>

enum metadata_type {
	METADATA_IP_TUNNEL,
	METADATA_HW_PORT_MUX,
	METADATA_MACSEC,
	METADATA_XFRM,
};

struct hw_port_info {
	struct net_device *lower_dev;
	u32 port_id;
};

struct macsec_info {
	sci_t sci;
};

struct xfrm_md_info {
	u32 if_id;
	int link;
	struct dst_entry *dst_orig;
};

struct metadata_dst {
	struct dst_entry		dst;
	enum metadata_type		type;
	union {
		struct ip_tunnel_info	tun_info;
		struct hw_port_info	port_info;
		struct macsec_info	macsec_info;
		struct xfrm_md_info	xfrm_info;
	} u;
};

static inline struct metadata_dst *skb_metadata_dst(const struct sk_buff *skb)
{
	struct metadata_dst *md_dst = (struct metadata_dst *) skb_dst(skb);

	if (md_dst && md_dst->dst.flags & DST_METADATA)
		return md_dst;

	return NULL;
}

static inline struct ip_tunnel_info *
skb_tunnel_info(const struct sk_buff *skb)
{
	struct metadata_dst *md_dst = skb_metadata_dst(skb);
	struct dst_entry *dst;

	if (md_dst && md_dst->type == METADATA_IP_TUNNEL)
		return &md_dst->u.tun_info;

	dst = skb_dst(skb);
	if (dst && dst->lwtstate &&
	    (dst->lwtstate->type == LWTUNNEL_ENCAP_IP ||
	     dst->lwtstate->type == LWTUNNEL_ENCAP_IP6))
		return lwt_tun_info(dst->lwtstate);

	return NULL;
}

static inline struct xfrm_md_info *lwt_xfrm_info(struct lwtunnel_state *lwt)
{
	return (struct xfrm_md_info *)lwt->data;
}

static inline struct xfrm_md_info *skb_xfrm_md_info(const struct sk_buff *skb)
{
	struct metadata_dst *md_dst = skb_metadata_dst(skb);
	struct dst_entry *dst;

	if (md_dst && md_dst->type == METADATA_XFRM)
		return &md_dst->u.xfrm_info;

	dst = skb_dst(skb);
	if (dst && dst->lwtstate &&
	    dst->lwtstate->type == LWTUNNEL_ENCAP_XFRM)
		return lwt_xfrm_info(dst->lwtstate);

	return NULL;
}

static inline bool skb_valid_dst(const struct sk_buff *skb)
{
	struct dst_entry *dst = skb_dst(skb);

	return dst && !(dst->flags & DST_METADATA);
}

static inline int skb_metadata_dst_cmp(const struct sk_buff *skb_a,
				       const struct sk_buff *skb_b)
{
	const struct metadata_dst *a, *b;

	if (!(skb_a->_skb_refdst | skb_b->_skb_refdst))
		return 0;

	a = (const struct metadata_dst *) skb_dst(skb_a);
	b = (const struct metadata_dst *) skb_dst(skb_b);

	if (!a != !b || a->type != b->type)
		return 1;

	switch (a->type) {
	case METADATA_HW_PORT_MUX:
		return memcmp(&a->u.port_info, &b->u.port_info,
			      sizeof(a->u.port_info));
	case METADATA_IP_TUNNEL:
		return memcmp(&a->u.tun_info, &b->u.tun_info,
			      sizeof(a->u.tun_info) +
					 a->u.tun_info.options_len);
	case METADATA_MACSEC:
		return memcmp(&a->u.macsec_info, &b->u.macsec_info,
			      sizeof(a->u.macsec_info));
	case METADATA_XFRM:
		return memcmp(&a->u.xfrm_info, &b->u.xfrm_info,
			      sizeof(a->u.xfrm_info));
	default:
		return 1;
	}
}

void metadata_dst_free(struct metadata_dst *);
struct metadata_dst *metadata_dst_alloc(u8 optslen, enum metadata_type type,
					gfp_t flags);
void metadata_dst_free_percpu(struct metadata_dst __percpu *md_dst);
struct metadata_dst __percpu *
metadata_dst_alloc_percpu(u8 optslen, enum metadata_type type, gfp_t flags);

static inline struct metadata_dst *tun_rx_dst(int md_size)
{
	struct metadata_dst *tun_dst;

	tun_dst = metadata_dst_alloc(md_size, METADATA_IP_TUNNEL, GFP_ATOMIC);
	if (!tun_dst)
		return NULL;

	tun_dst->u.tun_info.options_len = 0;
	tun_dst->u.tun_info.mode = 0;
	return tun_dst;
}

static inline struct metadata_dst *tun_dst_unclone(struct sk_buff *skb)
{
	struct metadata_dst *md_dst = skb_metadata_dst(skb);
	int md_size;
	struct metadata_dst *new_md;

	if (!md_dst || md_dst->type != METADATA_IP_TUNNEL)
		return ERR_PTR(-EINVAL);

	md_size = md_dst->u.tun_info.options_len;
	new_md = metadata_dst_alloc(md_size, METADATA_IP_TUNNEL, GFP_ATOMIC);
	if (!new_md)
		return ERR_PTR(-ENOMEM);

	memcpy(&new_md-