[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);
}

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->u.tun_info.options_len != b->u.tun_info.options_len)
		return 1;

	return memcmp(&a->u.tun_info, &b->u.tun_info,
		      sizeof(a->u.tun_info) + a->u.tun_info.options_len);
}

void metadata_dst_free(struct metadata_dst *);
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;
	struct metadata_dst *new_md;

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

	md_size = md_dst->u.tun_info.options_len;
	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, 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;
	info->key.label = ip6_flowlabel(ip6h);

	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
ce87fc6c JG	47	static inline int skb_metadata_dst_cmp(const struct sk_buff *skb_a,
	48	const struct sk_buff *skb_b)
	49	{
	50	const struct metadata_dst a, b;
	51
	52	if (!(skb_a->_skb_refdst \| skb_b->_skb_refdst))
	53	return 0;
	54
	55	a = (const struct metadata_dst *) skb_dst(skb_a);
	56	b = (const struct metadata_dst *) skb_dst(skb_b);
	57
	58	if (!a != !b \|\| a->u.tun_info.options_len != b->u.tun_info.options_len)
	59	return 1;
	60
	61	return memcmp(&a->u.tun_info, &b->u.tun_info,
	62	sizeof(a->u.tun_info) + a->u.tun_info.options_len);
	63	}
	64
d71785ff	65	void metadata_dst_free(struct metadata_dst *);
f38a9eb1	66	struct metadata_dst *metadata_dst_alloc(u8 optslen, gfp_t flags);
d3aa45ce	67	struct metadata_dst __percpu *metadata_dst_alloc_percpu(u8 optslen, gfp_t flags);
f38a9eb1	68
4c222798	69	static inline struct metadata_dst *tun_rx_dst(int md_size)
c29a70d2 PS	70	{
c29a70d2 PS	71	struct metadata_dst *tun_dst;
c29a70d2 PS	72
	73	tun_dst = metadata_dst_alloc(md_size, GFP_ATOMIC);
	74	if (!tun_dst)
	75	return NULL;
	76
4c222798 PS	77	tun_dst->u.tun_info.options_len = 0;
4c222798 PS	78	tun_dst->u.tun_info.mode = 0;
c29a70d2 PS	79	return tun_dst;
	80	}
	81
fc4099f1 PS	82	static inline struct metadata_dst tun_dst_unclone(struct sk_buff skb)
	83	{
	84	struct metadata_dst *md_dst = skb_metadata_dst(skb);
f63ce5b6	85	int md_size;
fc4099f1 PS	86	struct metadata_dst *new_md;
	87
	88	if (!md_dst)
	89	return ERR_PTR(-EINVAL);
	90
f63ce5b6	91	md_size = md_dst->u.tun_info.options_len;
fc4099f1 PS	92	new_md = metadata_dst_alloc(md_size, GFP_ATOMIC);
	93	if (!new_md)
	94	return ERR_PTR(-ENOMEM);
	95
	96	memcpy(&new_md->u.tun_info, &md_dst->u.tun_info,
	97	sizeof(struct ip_tunnel_info) + md_size);
	98	skb_dst_drop(skb);
	99	dst_hold(&new_md->dst);
	100	skb_dst_set(skb, &new_md->dst);
	101	return new_md;
	102	}
	103
	104	static inline struct ip_tunnel_info skb_tunnel_info_unclone(struct sk_buff skb)
	105	{
	106	struct metadata_dst *dst;
	107
	108	dst = tun_dst_unclone(skb);
	109	if (IS_ERR(dst))
	110	return NULL;
	111
	112	return &dst->u.tun_info;
	113	}
	114
c29a70d2 PS	115	static inline struct metadata_dst ip_tun_rx_dst(struct sk_buff skb,
	116	__be16 flags,
	117	__be64 tunnel_id,
	118	int md_size)
	119	{
	120	const struct iphdr *iph = ip_hdr(skb);
	121	struct metadata_dst *tun_dst;
c29a70d2	122
4c222798	123	tun_dst = tun_rx_dst(md_size);
c29a70d2 PS	124	if (!tun_dst)
	125	return NULL;
	126
4c222798 PS	127	ip_tunnel_key_init(&tun_dst->u.tun_info.key,
4c222798 PS	128	iph->saddr, iph->daddr, iph->tos, iph->ttl,
13461144	129	0, 0, 0, tunnel_id, flags);
c29a70d2 PS	130	return tun_dst;
	131	}
	132
	133	static inline struct metadata_dst ipv6_tun_rx_dst(struct sk_buff skb,
	134	__be16 flags,
	135	__be64 tunnel_id,
	136	int md_size)
	137	{
	138	const struct ipv6hdr *ip6h = ipv6_hdr(skb);
	139	struct metadata_dst *tun_dst;
	140	struct ip_tunnel_info *info;
	141
4c222798	142	tun_dst = tun_rx_dst(md_size);
c29a70d2 PS	143	if (!tun_dst)
	144	return NULL;
	145
	146	info = &tun_dst->u.tun_info;
4c222798 PS	147	info->mode = IP_TUNNEL_INFO_IPV6;
	148	info->key.tun_flags = flags;
	149	info->key.tun_id = tunnel_id;
	150	info->key.tp_src = 0;
	151	info->key.tp_dst = 0;
	152
c29a70d2 PS	153	info->key.u.ipv6.src = ip6h->saddr;
c29a70d2 PS	154	info->key.u.ipv6.dst = ip6h->daddr;
13461144	155
c29a70d2 PS	156	info->key.tos = ipv6_get_dsfield(ip6h);
c29a70d2 PS	157	info->key.ttl = ip6h->hop_limit;
13461144 DB	158	info->key.label = ip6_flowlabel(ip6h);
13461144 DB	159
c29a70d2 PS	160	return tun_dst;
	161	}
	162
f38a9eb1	163	#endif /* __NET_DST_METADATA_H */