[linux-2.6-block.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;

#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_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, 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
	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;
0189197f EB	23
f8efb73c RP	24	#define LABEL_NOT_SPECIFIED (1 << 20)
	25	#define MAX_NEW_LABELS 2
	26
	27	/* This maximum ha length copied from the definition of struct neighbour */
cf4b24f0 RS	28	#define VIA_ALEN_ALIGN sizeof(unsigned long)
cf4b24f0 RS	29	#define MAX_VIA_ALEN (ALIGN(MAX_ADDR_LEN, VIA_ALEN_ALIGN))
f8efb73c RP	30
	31	enum mpls_payload_type {
	32	MPT_UNSPEC, /* IPv4 or IPv6 */
	33	MPT_IPV4 = 4,
	34	MPT_IPV6 = 6,
	35
	36	/* Other types not implemented:
	37	* - Pseudo-wire with or without control word (RFC4385)
	38	* - GAL (RFC5586)
	39	*/
	40	};
	41
	42	struct mpls_nh { /* next hop label forwarding entry */
	43	struct net_device __rcu *nh_dev;
c89359a4	44	unsigned int nh_flags;
f8efb73c RP	45	u32 nh_label[MAX_NEW_LABELS];
	46	u8 nh_labels;
	47	u8 nh_via_alen;
	48	u8 nh_via_table;
f8efb73c RP	49	};
f8efb73c RP	50
cf4b24f0 RS	51	/* The route, nexthops and vias are stored together in the same memory
	52	* block:
	53	*
	54	* +----------------------+
	55	* \| mpls_route \|
	56	* +----------------------+
	57	* \| mpls_nh 0 \|
	58	* +----------------------+
	59	* \| ... \|
	60	* +----------------------+
	61	* \| mpls_nh n-1 \|
	62	* +----------------------+
	63	* \| alignment padding \|
	64	* +----------------------+
	65	* \| via[rt_max_alen] 0 \|
	66	* +----------------------+
	67	* \| ... \|
	68	* +----------------------+
	69	* \| via[rt_max_alen] n-1 \|
	70	* +----------------------+
	71	*/
f8efb73c RP	72	struct mpls_route { /* next hop label forwarding entry */
	73	struct rcu_head rt_rcu;
	74	u8 rt_protocol;
	75	u8 rt_payload_type;
cf4b24f0 RS	76	u8 rt_max_alen;
cf4b24f0 RS	77	unsigned int rt_nhn;
c89359a4	78	unsigned int rt_nhn_alive;
f8efb73c RP	79	struct mpls_nh rt_nh[0];
	80	};
	81
	82	#define for_nexthops(rt) { \
	83	int nhsel; struct mpls_nh *nh; \
	84	for (nhsel = 0, nh = (rt)->rt_nh; \
	85	nhsel < (rt)->rt_nhn; \
	86	nh++, nhsel++)
	87
	88	#define change_nexthops(rt) { \
	89	int nhsel; struct mpls_nh *nh; \
	90	for (nhsel = 0, nh = (struct mpls_nh *)((rt)->rt_nh); \
	91	nhsel < (rt)->rt_nhn; \
	92	nh++, nhsel++)
	93
	94	#define endfor_nexthops(rt) }
	95
0189197f EB	96	static inline struct mpls_shim_hdr mpls_hdr(const struct sk_buff skb)
	97	{
	98	return (struct mpls_shim_hdr *)skb_network_header(skb);
	99	}
	100
	101	static inline struct mpls_shim_hdr mpls_entry_encode(u32 label, unsigned ttl, unsigned tc, bool bos)
	102	{
	103	struct mpls_shim_hdr result;
	104	result.label_stack_entry =
	105	cpu_to_be32((label << MPLS_LS_LABEL_SHIFT) \|
	106	(tc << MPLS_LS_TC_SHIFT) \|
	107	(bos ? (1 << MPLS_LS_S_SHIFT) : 0) \|
	108	(ttl << MPLS_LS_TTL_SHIFT));
	109	return result;
	110	}
	111
	112	static inline struct mpls_entry_decoded mpls_entry_decode(struct mpls_shim_hdr *hdr)
	113	{
	114	struct mpls_entry_decoded result;
	115	unsigned entry = be32_to_cpu(hdr->label_stack_entry);
	116
	117	result.label = (entry & MPLS_LS_LABEL_MASK) >> MPLS_LS_LABEL_SHIFT;
	118	result.ttl = (entry & MPLS_LS_TTL_MASK) >> MPLS_LS_TTL_SHIFT;
	119	result.tc = (entry & MPLS_LS_TC_MASK) >> MPLS_LS_TC_SHIFT;
	120	result.bos = (entry & MPLS_LS_S_MASK) >> MPLS_LS_S_SHIFT;
	121
	122	return result;
	123	}
	124
face0188 RP	125	int nla_put_labels(struct sk_buff *skb, int attrtype, u8 labels,
face0188 RP	126	const u32 label[]);
f8efb73c	127	int nla_get_labels(const struct nlattr nla, u32 max_labels, u8 labels,
face0188	128	u32 label[]);
f8efb73c RP	129	int nla_get_via(const struct nlattr nla, u8 via_alen, u8 *via_table,
f8efb73c RP	130	u8 via[]);
face0188 RP	131	bool mpls_output_possible(const struct net_device *dev);
	132	unsigned int mpls_dev_mtu(const struct net_device *dev);
	133	bool mpls_pkt_too_big(const struct sk_buff *skb, unsigned int mtu);
966bae33	134
0189197f	135	#endif /* MPLS_INTERNAL_H */