[mirror_ubuntu-bionic-kernel.git] / include / net / dst_metadata.h

#ifndef __NET_DST_METADATA_H
#define __NET_DST_METADATA_H 1

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

struct metadata_dst {
	struct dst_entry		dst;
	union {
		struct ip_tunnel_info	tun_info;
	} u;
};

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

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

	dst = skb_dst(skb);
	if (dst && dst->lwtstate)
		return lwt_tun_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);
}

struct metadata_dst *metadata_dst_alloc(u8 optslen, gfp_t flags);
struct metadata_dst __percpu *metadata_dst_alloc_percpu(u8 optslen, 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, 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 *ip_tun_rx_dst(struct sk_buff *skb,
						 __be16 flags,
						 __be64 tunnel_id,
						 int md_size)
{
	const struct iphdr *iph = ip_hdr(skb);
	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,
			   iph->saddr, iph->daddr, iph->tos, iph->ttl,
			   0, 0, tunnel_id, flags);
	return tun_dst;
}

static inline struct metadata_dst *ipv6_tun_rx_dst(struct sk_buff *skb,
						 __be16 flags,
						 __be64 tunnel_id,
						 int md_size)
{
	const struct ipv6hdr *ip6h = ipv6_hdr(skb);
	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;
	info->key.tun_flags = flags;
	info->key.tun_id = tunnel_id;
	info->key.tp_src = 0;
	info->key.tp_dst = 0;

	info->key.u.ipv6.src = ip6h->saddr;
	info->key.u.ipv6.dst = ip6h->daddr;
	info->key.tos = ipv6_get_dsfield(ip6h);
	info->key.ttl = ip6h->hop_limit;
	return tun_dst;
}

#endif /* __NET_DST_METADATA_H */
Commit	Line	Data
f38a9eb1 TG	1	#ifndef __NET_DST_METADATA_H
	2	#define __NET_DST_METADATA_H 1
	3
	4	#include <linux/skbuff.h>
	5	#include <net/ip_tunnels.h>
	6	#include <net/dst.h>
	7
	8	struct metadata_dst {
	9	struct dst_entry dst;
ee122c79 TG	10	union {
	11	struct ip_tunnel_info tun_info;
	12	} u;
f38a9eb1 TG	13	};
	14
	15	static inline struct metadata_dst skb_metadata_dst(struct sk_buff skb)
	16	{
	17	struct metadata_dst md_dst = (struct metadata_dst ) skb_dst(skb);
	18
	19	if (md_dst && md_dst->dst.flags & DST_METADATA)
	20	return md_dst;
	21
	22	return NULL;
	23	}
	24
61adedf3	25	static inline struct ip_tunnel_info skb_tunnel_info(struct sk_buff skb)
ee122c79 TG	26	{
ee122c79 TG	27	struct metadata_dst *md_dst = skb_metadata_dst(skb);
61adedf3	28	struct dst_entry *dst;
ee122c79 TG	29
	30	if (md_dst)
	31	return &md_dst->u.tun_info;
	32
61adedf3 JB	33	dst = skb_dst(skb);
	34	if (dst && dst->lwtstate)
	35	return lwt_tun_info(dst->lwtstate);
3093fbe7	36
ee122c79 TG	37	return NULL;
	38	}
	39
f38a9eb1 TG	40	static inline bool skb_valid_dst(const struct sk_buff *skb)
	41	{
	42	struct dst_entry *dst = skb_dst(skb);
	43
	44	return dst && !(dst->flags & DST_METADATA);
	45	}
	46
	47	struct metadata_dst *metadata_dst_alloc(u8 optslen, gfp_t flags);
d3aa45ce	48	struct metadata_dst __percpu *metadata_dst_alloc_percpu(u8 optslen, gfp_t flags);
f38a9eb1	49
4c222798	50	static inline struct metadata_dst *tun_rx_dst(int md_size)
c29a70d2 PS	51	{
c29a70d2 PS	52	struct metadata_dst *tun_dst;
c29a70d2 PS	53
	54	tun_dst = metadata_dst_alloc(md_size, GFP_ATOMIC);
	55	if (!tun_dst)
	56	return NULL;
	57
4c222798 PS	58	tun_dst->u.tun_info.options_len = 0;
4c222798 PS	59	tun_dst->u.tun_info.mode = 0;
c29a70d2 PS	60	return tun_dst;
	61	}
	62
	63	static inline struct metadata_dst ip_tun_rx_dst(struct sk_buff skb,
	64	__be16 flags,
	65	__be64 tunnel_id,
	66	int md_size)
	67	{
	68	const struct iphdr *iph = ip_hdr(skb);
	69	struct metadata_dst *tun_dst;
c29a70d2	70
4c222798	71	tun_dst = tun_rx_dst(md_size);
c29a70d2 PS	72	if (!tun_dst)
	73	return NULL;
	74
4c222798 PS	75	ip_tunnel_key_init(&tun_dst->u.tun_info.key,
	76	iph->saddr, iph->daddr, iph->tos, iph->ttl,
	77	0, 0, tunnel_id, flags);
c29a70d2 PS	78	return tun_dst;
	79	}
	80
	81	static inline struct metadata_dst ipv6_tun_rx_dst(struct sk_buff skb,
	82	__be16 flags,
	83	__be64 tunnel_id,
	84	int md_size)
	85	{
	86	const struct ipv6hdr *ip6h = ipv6_hdr(skb);
	87	struct metadata_dst *tun_dst;
	88	struct ip_tunnel_info *info;
	89
4c222798	90	tun_dst = tun_rx_dst(md_size);
c29a70d2 PS	91	if (!tun_dst)
	92	return NULL;
	93
	94	info = &tun_dst->u.tun_info;
4c222798 PS	95	info->mode = IP_TUNNEL_INFO_IPV6;
	96	info->key.tun_flags = flags;
	97	info->key.tun_id = tunnel_id;
	98	info->key.tp_src = 0;
	99	info->key.tp_dst = 0;
	100
c29a70d2 PS	101	info->key.u.ipv6.src = ip6h->saddr;
	102	info->key.u.ipv6.dst = ip6h->daddr;
	103	info->key.tos = ipv6_get_dsfield(ip6h);
	104	info->key.ttl = ip6h->hop_limit;
	105	return tun_dst;
	106	}
	107
f38a9eb1	108	#endif /* __NET_DST_METADATA_H */