/* SPDX-License-Identifier: GPL-2.0 */#ifndef __NET_DST_METADATA_H#define __NET_DST_METADATA_H 1 #include <linux/skbuff.h>#include <net/ip.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); 	/* Copy in two stages to keep the __counted_by happy. */	new_md->u.tun_info = md_dst->u.tun_info;	memcpy(ip_tunnel_info_opts(&new_md->u.tun_info),	       ip_tunnel_info_opts(&md_dst->u.tun_info), md_size); #ifdef CONFIG_DST_CACHE	/* Unclone the dst cache if there is one */	if (new_md->u.tun_info.dst_cache.cache) {		int ret; 		ret = dst_cache_init(&new_md->u.tun_info.dst_cache, GFP_ATOMIC);		if (ret) {			metadata_dst_free(new_md);			return ERR_PTR(ret);		}	}#endif 	skb_dst_drop(skb);	skb_dst_set(skb, &new_md->dst);	return new_md;} static inline struct ip_tunnel_info *skb_tunnel_info_unclone(struct sk_buff *skb){	struct metadata_dst *dst; 	dst = tun_dst_unclone(skb);	if (IS_ERR(dst))		return NULL; 	return &dst->u.tun_info;} static inline struct metadata_dst *__ip_tun_set_dst(__be32 saddr,						    __be32 daddr,						    __u8 tos, __u8 ttl,						    __be16 tp_dst,						    const unsigned long *flags,						    __be64 tunnel_id,						    int md_size){	struct metadata_dst *tun_dst; 	tun_dst = tun_rx_dst(md_size);	if (!tun_dst)		return NULL; 	ip_tunnel_key_init(&tun_dst->u.tun_info.key,			   saddr, daddr, tos, ttl,			   0, 0, tp_dst, tunnel_id, flags);	return tun_dst;} static inline struct metadata_dst *ip_tun_rx_dst(struct sk_buff *skb,						 const unsigned long *flags,						 __be64 tunnel_id,						 int md_size){	const struct iphdr *iph = ip_hdr(skb);	struct metadata_dst *tun_dst; 	tun_dst = __ip_tun_set_dst(iph->saddr, iph->daddr, iph->tos, iph->ttl,				   0, flags, tunnel_id, md_size); 	if (tun_dst && (iph->frag_off & htons(IP_DF)))		__set_bit(IP_TUNNEL_DONT_FRAGMENT_BIT,			  tun_dst->u.tun_info.key.tun_flags);	return tun_dst;} static inline struct metadata_dst *__ipv6_tun_set_dst(const struct in6_addr *saddr,						      const struct in6_addr *daddr,						      __u8 tos, __u8 ttl,						      __be16 tp_dst,						      __be32 label,						      const unsigned long *flags,						      __be64 tunnel_id,						      int md_size){	struct metadata_dst *tun_dst;	struct ip_tunnel_info *info; 	tun_dst = tun_rx_dst(md_size);	if (!tun_dst)		return NULL; 	info = &tun_dst->u.tun_info;	info->mode = IP_TUNNEL_INFO_IPV6;	ip_tunnel_flags_copy(info->key.tun_flags, flags);	info->key.tun_id = tunnel_id;	info->key.tp_src = 0;	info->key.tp_dst = tp_dst; 	info->key.u.ipv6.src = *saddr;	info->key.u.ipv6.dst = *daddr; 	info->key.tos = tos;	info->key.ttl = ttl;	info->key.label = label; 	return tun_dst;} static inline struct metadata_dst *ipv6_tun_rx_dst(struct sk_buff *skb,						   const unsigned long *flags,						   __be64 tunnel_id,						   int md_size){	const struct ipv6hdr *ip6h = ipv6_hdr(skb); 	return __ipv6_tun_set_dst(&ip6h->saddr, &ip6h->daddr,				  ipv6_get_dsfield(ip6h), ip6h->hop_limit,				  0, ip6_flowlabel(ip6h), flags, tunnel_id,				  md_size);}#endif /* __NET_DST_METADATA_H */