[mirror_ubuntu-focal-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 rcu_head		rcu;
};

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;
25cc8f07	19	struct rcu_head rcu;
03c57747 RS	20	};
03c57747 RS	21
0189197f EB	22	struct sk_buff;
	23
	24	static inline struct mpls_shim_hdr mpls_hdr(const struct sk_buff skb)
	25	{
	26	return (struct mpls_shim_hdr *)skb_network_header(skb);
	27	}
	28
	29	static inline struct mpls_shim_hdr mpls_entry_encode(u32 label, unsigned ttl, unsigned tc, bool bos)
	30	{
	31	struct mpls_shim_hdr result;
	32	result.label_stack_entry =
	33	cpu_to_be32((label << MPLS_LS_LABEL_SHIFT) \|
	34	(tc << MPLS_LS_TC_SHIFT) \|
	35	(bos ? (1 << MPLS_LS_S_SHIFT) : 0) \|
	36	(ttl << MPLS_LS_TTL_SHIFT));
	37	return result;
	38	}
	39
	40	static inline struct mpls_entry_decoded mpls_entry_decode(struct mpls_shim_hdr *hdr)
	41	{
	42	struct mpls_entry_decoded result;
	43	unsigned entry = be32_to_cpu(hdr->label_stack_entry);
	44
	45	result.label = (entry & MPLS_LS_LABEL_MASK) >> MPLS_LS_LABEL_SHIFT;
	46	result.ttl = (entry & MPLS_LS_TTL_MASK) >> MPLS_LS_TTL_SHIFT;
	47	result.tc = (entry & MPLS_LS_TC_MASK) >> MPLS_LS_TC_SHIFT;
	48	result.bos = (entry & MPLS_LS_S_MASK) >> MPLS_LS_S_SHIFT;
	49
	50	return result;
	51	}
	52
966bae33 EB	53	int nla_put_labels(struct sk_buff *skb, int attrtype, u8 labels, const u32 label[]);
	54	int nla_get_labels(const struct nlattr nla, u32 max_labels, u32 labels, u32 label[]);
	55
0189197f	56	#endif /* MPLS_INTERNAL_H */