[mirror_ubuntu-artful-kernel.git] / net / mpls / internal.h

#ifndef MPLS_INTERNAL_H
#define MPLS_INTERNAL_H

struct mpls_shim_hdr {
	__be32 label_stack_entry;
};

struct mpls_entry_decoded {
	u32 label;
	u8 ttl;
	u8 tc;
	u8 bos;
};

struct mpls_dev {
	int			input_enabled;

	struct ctl_table_header *sysctl;
};

struct sk_buff;

static inline struct mpls_shim_hdr *mpls_hdr(const struct sk_buff *skb)
{
	return (struct mpls_shim_hdr *)skb_network_header(skb);
}

static inline struct mpls_shim_hdr mpls_entry_encode(u32 label, unsigned ttl, unsigned tc, bool bos)
{
	struct mpls_shim_hdr result;
	result.label_stack_entry =
		cpu_to_be32((label << MPLS_LS_LABEL_SHIFT) |
			    (tc << MPLS_LS_TC_SHIFT) |
			    (bos ? (1 << MPLS_LS_S_SHIFT) : 0) |
			    (ttl << MPLS_LS_TTL_SHIFT));
	return result;
}

static inline struct mpls_entry_decoded mpls_entry_decode(struct mpls_shim_hdr *hdr)
{
	struct mpls_entry_decoded result;
	unsigned entry = be32_to_cpu(hdr->label_stack_entry);

	result.label = (entry & MPLS_LS_LABEL_MASK) >> MPLS_LS_LABEL_SHIFT;
	result.ttl = (entry & MPLS_LS_TTL_MASK) >> MPLS_LS_TTL_SHIFT;
	result.tc =  (entry & MPLS_LS_TC_MASK) >> MPLS_LS_TC_SHIFT;
	result.bos = (entry & MPLS_LS_S_MASK) >> MPLS_LS_S_SHIFT;

	return result;
}

int nla_put_labels(struct sk_buff *skb, int attrtype,  u8 labels, const u32 label[]);
int nla_get_labels(const struct nlattr *nla, u32 max_labels, u32 *labels, u32 label[]);

#endif /* MPLS_INTERNAL_H */
Commit	Line	Data
0189197f EB	1	#ifndef MPLS_INTERNAL_H
	2	#define MPLS_INTERNAL_H
	3
0189197f EB	4	struct mpls_shim_hdr {
	5	__be32 label_stack_entry;
	6	};
	7
	8	struct mpls_entry_decoded {
	9	u32 label;
	10	u8 ttl;
	11	u8 tc;
	12	u8 bos;
	13	};
	14
03c57747	15	struct mpls_dev {
37bde799 RS	16	int input_enabled;
	17
	18	struct ctl_table_header *sysctl;
03c57747 RS	19	};
03c57747 RS	20
0189197f EB	21	struct sk_buff;
	22
	23	static inline struct mpls_shim_hdr mpls_hdr(const struct sk_buff skb)
	24	{
	25	return (struct mpls_shim_hdr *)skb_network_header(skb);
	26	}
	27
	28	static inline struct mpls_shim_hdr mpls_entry_encode(u32 label, unsigned ttl, unsigned tc, bool bos)
	29	{
	30	struct mpls_shim_hdr result;
	31	result.label_stack_entry =
	32	cpu_to_be32((label << MPLS_LS_LABEL_SHIFT) \|
	33	(tc << MPLS_LS_TC_SHIFT) \|
	34	(bos ? (1 << MPLS_LS_S_SHIFT) : 0) \|
	35	(ttl << MPLS_LS_TTL_SHIFT));
	36	return result;
	37	}
	38
	39	static inline struct mpls_entry_decoded mpls_entry_decode(struct mpls_shim_hdr *hdr)
	40	{
	41	struct mpls_entry_decoded result;
	42	unsigned entry = be32_to_cpu(hdr->label_stack_entry);
	43
	44	result.label = (entry & MPLS_LS_LABEL_MASK) >> MPLS_LS_LABEL_SHIFT;
	45	result.ttl = (entry & MPLS_LS_TTL_MASK) >> MPLS_LS_TTL_SHIFT;
	46	result.tc = (entry & MPLS_LS_TC_MASK) >> MPLS_LS_TC_SHIFT;
	47	result.bos = (entry & MPLS_LS_S_MASK) >> MPLS_LS_S_SHIFT;
	48
	49	return result;
	50	}
	51
966bae33 EB	52	int nla_put_labels(struct sk_buff *skb, int attrtype, u8 labels, const u32 label[]);
	53	int nla_get_labels(const struct nlattr nla, u32 max_labels, u32 labels, u32 label[]);
	54
0189197f	55	#endif /* MPLS_INTERNAL_H */