#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 */
|
