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

#ifndef MPLS_INTERNAL_H
#define MPLS_INTERNAL_H
#include <net/mpls.h>

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;

#define LABEL_NOT_SPECIFIED (1 << 20)
#define MAX_NEW_LABELS 2

/* This maximum ha length copied from the definition of struct neighbour */
#define VIA_ALEN_ALIGN sizeof(unsigned long)
#define MAX_VIA_ALEN (ALIGN(MAX_ADDR_LEN, VIA_ALEN_ALIGN))

enum mpls_payload_type {
	MPT_UNSPEC, /* IPv4 or IPv6 */
	MPT_IPV4 = 4,
	MPT_IPV6 = 6,

	/* Other types not implemented:
	 *  - Pseudo-wire with or without control word (RFC4385)
	 *  - GAL (RFC5586)
	 */
};

struct mpls_nh { /* next hop label forwarding entry */
	struct net_device __rcu *nh_dev;
	unsigned int		nh_flags;
	u32			nh_label[MAX_NEW_LABELS];
	u8			nh_labels;
	u8			nh_via_alen;
	u8			nh_via_table;
};

/* The route, nexthops and vias are stored together in the same memory
 * block:
 *
 * +----------------------+
 * | mpls_route           |
 * +----------------------+
 * | mpls_nh 0            |
 * +----------------------+
 * | ...                  |
 * +----------------------+
 * | mpls_nh n-1          |
 * +----------------------+
 * | alignment padding    |
 * +----------------------+
 * | via[rt_max_alen] 0   |
 * +----------------------+
 * | ...                  |
 * +----------------------+
 * | via[rt_max_alen] n-1 |
 * +----------------------+
 */
struct mpls_route { /* next hop label forwarding entry */
	struct rcu_head		rt_rcu;
	u8			rt_protocol;
	u8			rt_payload_type;
	u8			rt_max_alen;
	unsigned int		rt_nhn;
	unsigned int		rt_nhn_alive;
	struct mpls_nh		rt_nh[0];
};

#define for_nexthops(rt) {						\
	int nhsel; struct mpls_nh *nh;			\
	for (nhsel = 0, nh = (rt)->rt_nh;				\
	     nhsel < (rt)->rt_nhn;					\
	     nh++, nhsel++)

#define change_nexthops(rt) {						\
	int nhsel; struct mpls_nh *nh;				\
	for (nhsel = 0,	nh = (struct mpls_nh *)((rt)->rt_nh);	\
	     nhsel < (rt)->rt_nhn;					\
	     nh++, nhsel++)

#define endfor_nexthops(rt) }

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, u8 *labels,
		   u32 label[]);
int nla_get_via(const struct nlattr *nla, u8 *via_alen, u8 *via_table,
		u8 via[]);
bool mpls_output_possible(const struct net_device *dev);
unsigned int mpls_dev_mtu(const struct net_device *dev);
bool mpls_pkt_too_big(const struct sk_buff *skb, unsigned int mtu);

#endif /* MPLS_INTERNAL_H */
Commit	Line	Data
0189197f EB	1	#ifndef MPLS_INTERNAL_H
0189197f EB	2	#define MPLS_INTERNAL_H
9095e10e	3	#include <net/mpls.h>
0189197f EB	4
	5	struct mpls_entry_decoded {
	6	u32 label;
	7	u8 ttl;
	8	u8 tc;
	9	u8 bos;
	10	};
	11
03c57747	12	struct mpls_dev {
37bde799 RS	13	int input_enabled;
	14
	15	struct ctl_table_header *sysctl;
25cc8f07	16	struct rcu_head rcu;
03c57747 RS	17	};
03c57747 RS	18
0189197f EB	19	struct sk_buff;
0189197f EB	20
f8efb73c RP	21	#define LABEL_NOT_SPECIFIED (1 << 20)
	22	#define MAX_NEW_LABELS 2
	23
	24	/* This maximum ha length copied from the definition of struct neighbour */
cf4b24f0 RS	25	#define VIA_ALEN_ALIGN sizeof(unsigned long)
cf4b24f0 RS	26	#define MAX_VIA_ALEN (ALIGN(MAX_ADDR_LEN, VIA_ALEN_ALIGN))
f8efb73c RP	27
	28	enum mpls_payload_type {
	29	MPT_UNSPEC, /* IPv4 or IPv6 */
	30	MPT_IPV4 = 4,
	31	MPT_IPV6 = 6,
	32
	33	/* Other types not implemented:
	34	* - Pseudo-wire with or without control word (RFC4385)
	35	* - GAL (RFC5586)
	36	*/
	37	};
	38
	39	struct mpls_nh { /* next hop label forwarding entry */
	40	struct net_device __rcu *nh_dev;
c89359a4	41	unsigned int nh_flags;
f8efb73c RP	42	u32 nh_label[MAX_NEW_LABELS];
	43	u8 nh_labels;
	44	u8 nh_via_alen;
	45	u8 nh_via_table;
f8efb73c RP	46	};
f8efb73c RP	47
cf4b24f0 RS	48	/* The route, nexthops and vias are stored together in the same memory
	49	* block:
	50	*
	51	* +----------------------+
	52	* \| mpls_route \|
	53	* +----------------------+
	54	* \| mpls_nh 0 \|
	55	* +----------------------+
	56	* \| ... \|
	57	* +----------------------+
	58	* \| mpls_nh n-1 \|
	59	* +----------------------+
	60	* \| alignment padding \|
	61	* +----------------------+
	62	* \| via[rt_max_alen] 0 \|
	63	* +----------------------+
	64	* \| ... \|
	65	* +----------------------+
	66	* \| via[rt_max_alen] n-1 \|
	67	* +----------------------+
	68	*/
f8efb73c RP	69	struct mpls_route { /* next hop label forwarding entry */
	70	struct rcu_head rt_rcu;
	71	u8 rt_protocol;
	72	u8 rt_payload_type;
cf4b24f0 RS	73	u8 rt_max_alen;
cf4b24f0 RS	74	unsigned int rt_nhn;
c89359a4	75	unsigned int rt_nhn_alive;
f8efb73c RP	76	struct mpls_nh rt_nh[0];
	77	};
	78
	79	#define for_nexthops(rt) { \
	80	int nhsel; struct mpls_nh *nh; \
	81	for (nhsel = 0, nh = (rt)->rt_nh; \
	82	nhsel < (rt)->rt_nhn; \
	83	nh++, nhsel++)
	84
	85	#define change_nexthops(rt) { \
	86	int nhsel; struct mpls_nh *nh; \
	87	for (nhsel = 0, nh = (struct mpls_nh *)((rt)->rt_nh); \
	88	nhsel < (rt)->rt_nhn; \
	89	nh++, nhsel++)
	90
	91	#define endfor_nexthops(rt) }
	92
0189197f EB	93	static inline struct mpls_shim_hdr mpls_entry_encode(u32 label, unsigned ttl, unsigned tc, bool bos)
	94	{
	95	struct mpls_shim_hdr result;
	96	result.label_stack_entry =
	97	cpu_to_be32((label << MPLS_LS_LABEL_SHIFT) \|
	98	(tc << MPLS_LS_TC_SHIFT) \|
	99	(bos ? (1 << MPLS_LS_S_SHIFT) : 0) \|
	100	(ttl << MPLS_LS_TTL_SHIFT));
	101	return result;
	102	}
	103
	104	static inline struct mpls_entry_decoded mpls_entry_decode(struct mpls_shim_hdr *hdr)
	105	{
	106	struct mpls_entry_decoded result;
	107	unsigned entry = be32_to_cpu(hdr->label_stack_entry);
	108
	109	result.label = (entry & MPLS_LS_LABEL_MASK) >> MPLS_LS_LABEL_SHIFT;
	110	result.ttl = (entry & MPLS_LS_TTL_MASK) >> MPLS_LS_TTL_SHIFT;
	111	result.tc = (entry & MPLS_LS_TC_MASK) >> MPLS_LS_TC_SHIFT;
	112	result.bos = (entry & MPLS_LS_S_MASK) >> MPLS_LS_S_SHIFT;
	113
	114	return result;
	115	}
	116
face0188 RP	117	int nla_put_labels(struct sk_buff *skb, int attrtype, u8 labels,
face0188 RP	118	const u32 label[]);
f8efb73c	119	int nla_get_labels(const struct nlattr nla, u32 max_labels, u8 labels,
face0188	120	u32 label[]);
f8efb73c RP	121	int nla_get_via(const struct nlattr nla, u8 via_alen, u8 *via_table,
f8efb73c RP	122	u8 via[]);
face0188 RP	123	bool mpls_output_possible(const struct net_device *dev);
	124	unsigned int mpls_dev_mtu(const struct net_device *dev);
	125	bool mpls_pkt_too_big(const struct sk_buff *skb, unsigned int mtu);
966bae33	126
0189197f	127	#endif /* MPLS_INTERNAL_H */