[deliverable/linux.git] / net / mpls / internal.h

#ifndef MPLS_INTERNAL_H
#define MPLS_INTERNAL_H

#define LABEL_IPV4_EXPLICIT_NULL	0 /* RFC3032 */
#define LABEL_ROUTER_ALERT_LABEL	1 /* RFC3032 */
#define LABEL_IPV6_EXPLICIT_NULL	2 /* RFC3032 */
#define LABEL_IMPLICIT_NULL		3 /* RFC3032 */
#define LABEL_ENTROPY_INDICATOR		7 /* RFC6790 */
#define LABEL_GAL			13 /* RFC5586 */
#define LABEL_OAM_ALERT			14 /* RFC3429 */
#define LABEL_EXTENSION			15 /* RFC7274 */


struct mpls_shim_hdr {
	__be32 label_stack_entry;
};

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

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;
}

#endif /* MPLS_INTERNAL_H */
Commit	Line	Data
0189197f EB	1	#ifndef MPLS_INTERNAL_H
	2	#define MPLS_INTERNAL_H
	3
	4	#define LABEL_IPV4_EXPLICIT_NULL 0 /* RFC3032 */
	5	#define LABEL_ROUTER_ALERT_LABEL 1 /* RFC3032 */
	6	#define LABEL_IPV6_EXPLICIT_NULL 2 /* RFC3032 */
	7	#define LABEL_IMPLICIT_NULL 3 /* RFC3032 */
	8	#define LABEL_ENTROPY_INDICATOR 7 /* RFC6790 */
	9	#define LABEL_GAL 13 /* RFC5586 */
	10	#define LABEL_OAM_ALERT 14 /* RFC3429 */
	11	#define LABEL_EXTENSION 15 /* RFC7274 */
	12
	13
	14	struct mpls_shim_hdr {
	15	__be32 label_stack_entry;
	16	};
	17
	18	struct mpls_entry_decoded {
	19	u32 label;
	20	u8 ttl;
	21	u8 tc;
	22	u8 bos;
	23	};
	24
	25	struct sk_buff;
	26
	27	static inline struct mpls_shim_hdr mpls_hdr(const struct sk_buff skb)
	28	{
	29	return (struct mpls_shim_hdr *)skb_network_header(skb);
	30	}
	31
	32	static inline struct mpls_shim_hdr mpls_entry_encode(u32 label, unsigned ttl, unsigned tc, bool bos)
	33	{
	34	struct mpls_shim_hdr result;
	35	result.label_stack_entry =
	36	cpu_to_be32((label << MPLS_LS_LABEL_SHIFT) \|
	37	(tc << MPLS_LS_TC_SHIFT) \|
	38	(bos ? (1 << MPLS_LS_S_SHIFT) : 0) \|
	39	(ttl << MPLS_LS_TTL_SHIFT));
	40	return result;
	41	}
	42
	43	static inline struct mpls_entry_decoded mpls_entry_decode(struct mpls_shim_hdr *hdr)
	44	{
	45	struct mpls_entry_decoded result;
	46	unsigned entry = be32_to_cpu(hdr->label_stack_entry);
	47
	48	result.label = (entry & MPLS_LS_LABEL_MASK) >> MPLS_LS_LABEL_SHIFT;
	49	result.ttl = (entry & MPLS_LS_TTL_MASK) >> MPLS_LS_TTL_SHIFT;
	50	result.tc = (entry & MPLS_LS_TC_MASK) >> MPLS_LS_TC_SHIFT;
	51	result.bos = (entry & MPLS_LS_S_MASK) >> MPLS_LS_S_SHIFT;
	52
	53	return result;
	54	}
	55
	56	#endif /* MPLS_INTERNAL_H */