[linux-2.6-block.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 *tun_dst_unclone(struct sk_buff *skb)
{
	struct metadata_dst *md_dst = skb_metadata_dst(skb);
	int md_size = md_dst->u.tun_info.options_len;
	struct metadata_dst *new_md;

	if (!md_dst)
		return ERR_PTR(-EINVAL);

	new_md = metadata_dst_alloc(md_size, GFP_ATOMIC);
	if (!new_md)
		return ERR_PTR(-ENOMEM);

	memcpy(&new_md->u.tun_info, &md_dst->u.tun_info,
	       sizeof(struct ip_tunnel_info) + md_size);
	skb_dst_drop(skb);
	dst_hold(&new_md->dst);
	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_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
fc4099f1 PS	63	static inline struct metadata_dst tun_dst_unclone(struct sk_buff skb)
	64	{
	65	struct metadata_dst *md_dst = skb_metadata_dst(skb);
	66	int md_size = md_dst->u.tun_info.options_len;
	67	struct metadata_dst *new_md;
	68
	69	if (!md_dst)
	70	return ERR_PTR(-EINVAL);
	71
	72	new_md = metadata_dst_alloc(md_size, GFP_ATOMIC);
	73	if (!new_md)
	74	return ERR_PTR(-ENOMEM);
	75
	76	memcpy(&new_md->u.tun_info, &md_dst->u.tun_info,
	77	sizeof(struct ip_tunnel_info) + md_size);
	78	skb_dst_drop(skb);
	79	dst_hold(&new_md->dst);
	80	skb_dst_set(skb, &new_md->dst);
	81	return new_md;
	82	}
	83
	84	static inline struct ip_tunnel_info skb_tunnel_info_unclone(struct sk_buff skb)
	85	{
	86	struct metadata_dst *dst;
	87
	88	dst = tun_dst_unclone(skb);
	89	if (IS_ERR(dst))
	90	return NULL;
	91
	92	return &dst->u.tun_info;
	93	}
	94
c29a70d2 PS	95	static inline struct metadata_dst ip_tun_rx_dst(struct sk_buff skb,
	96	__be16 flags,
	97	__be64 tunnel_id,
	98	int md_size)
	99	{
	100	const struct iphdr *iph = ip_hdr(skb);
	101	struct metadata_dst *tun_dst;
c29a70d2	102
4c222798	103	tun_dst = tun_rx_dst(md_size);
c29a70d2 PS	104	if (!tun_dst)
	105	return NULL;
	106
4c222798 PS	107	ip_tunnel_key_init(&tun_dst->u.tun_info.key,
	108	iph->saddr, iph->daddr, iph->tos, iph->ttl,
	109	0, 0, tunnel_id, flags);
c29a70d2 PS	110	return tun_dst;
	111	}
	112
	113	static inline struct metadata_dst ipv6_tun_rx_dst(struct sk_buff skb,
	114	__be16 flags,
	115	__be64 tunnel_id,
	116	int md_size)
	117	{
	118	const struct ipv6hdr *ip6h = ipv6_hdr(skb);
	119	struct metadata_dst *tun_dst;
	120	struct ip_tunnel_info *info;
	121
4c222798	122	tun_dst = tun_rx_dst(md_size);
c29a70d2 PS	123	if (!tun_dst)
	124	return NULL;
	125
	126	info = &tun_dst->u.tun_info;
4c222798 PS	127	info->mode = IP_TUNNEL_INFO_IPV6;
	128	info->key.tun_flags = flags;
	129	info->key.tun_id = tunnel_id;
	130	info->key.tp_src = 0;
	131	info->key.tp_dst = 0;
	132
c29a70d2 PS	133	info->key.u.ipv6.src = ip6h->saddr;
	134	info->key.u.ipv6.dst = ip6h->daddr;
	135	info->key.tos = ipv6_get_dsfield(ip6h);
	136	info->key.ttl = ip6h->hop_limit;
	137	return tun_dst;
	138	}
	139
f38a9eb1	140	#endif /* __NET_DST_METADATA_H */