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/*
* BIRD Internet Routing Daemon -- MPLS Structures
*
* (c) 2022 Ondrej Zajicek <santiago@crfreenet.org>
* (c) 2022 CZ.NIC z.s.p.o.
*
* Can be freely distributed and used under the terms of the GNU GPL.
*/
#ifndef _BIRD_MPLS_H_
#define _BIRD_MPLS_H_
#include "nest/bird.h"
#include "lib/bitmap.h"
#include "lib/hash.h"
#include "nest/route.h"
#include "nest/protocol.h"
#define MPLS_POLICY_NONE 0
#define MPLS_POLICY_STATIC 1
#define MPLS_POLICY_PREFIX 2
#define MPLS_POLICY_AGGREGATE 3
#define MPLS_POLICY_VRF 4
#define MPLS_FEC_DOWN 0
#define MPLS_FEC_CLEAN 1
#define MPLS_FEC_DIRTY 2
struct mpls_domain_config {
node n; /* Node in config.mpls_domains */
struct mpls_domain *domain; /* Our instance */
const char *name;
list ranges; /* List of label ranges (struct mpls_range_config) */
struct mpls_range_config *static_range; /* Default static label range */
struct mpls_range_config *dynamic_range; /* Default dynamic label range */
};
struct mpls_domain {
node n; /* Node in global list of MPLS domains (mpls_domains) */
struct mpls_domain_config *cf; /* Our config */
const char *name;
pool *pool; /* Pool for the domain and associated objects */
struct lmap labels; /* Bitmap of allocated labels */
uint label_count; /* Number of allocated labels */
uint use_count; /* Reference counter */
struct config *removed; /* Deconfigured, waiting for zero use_count,
while keeping config obstacle */
list ranges; /* List of label ranges (struct mpls_range) */
list handles; /* List of label handles (struct mpls_handle) */
};
struct mpls_range_config {
node n; /* Node in mpls_domain_config.ranges */
struct mpls_range *range; /* Our instance */
struct mpls_domain_config *domain; /* Parent MPLS domain */
const char *name;
uint start; /* Label range start, (uint) -1 for undefined */
uint length; /* Label range length, (uint) -1 for undefined */
u8 implicit; /* Implicitly defined range */
};
struct mpls_range {
node n; /* Node in mpls_domain.ranges */
struct mpls_range_config *cf; /* Our config */
const char *name;
uint lo, hi; /* Label range interval */
uint label_count; /* Number of allocated labels */
uint use_count; /* Reference counter */
u8 removed; /* Deconfigured, waiting for zero use_count */
};
struct mpls_handle {
node n; /* Node in mpls_domain.handles */
struct mpls_range *range; /* Associated range, keeping reference */
uint label_count; /* Number of allocated labels */
};
void mpls_init(void);
struct mpls_domain_config * mpls_domain_config_new(struct symbol *s);
void mpls_domain_postconfig(struct mpls_domain_config *cf);
struct mpls_range_config * mpls_range_config_new(struct mpls_domain_config *m, struct symbol *s);
void mpls_preconfig(struct config *c);
void mpls_commit(struct config *new, struct config *old);
uint mpls_new_label(struct mpls_domain *m, struct mpls_handle *h, uint n);
void mpls_free_label(struct mpls_domain *m, struct mpls_handle *h, uint n);
static inline struct mpls_domain_config *cf_default_mpls_domain(struct config *cfg)
{ return EMPTY_LIST(cfg->mpls_domains) ? NULL : HEAD(cfg->mpls_domains); }
struct mpls_channel_config {
struct channel_config c;
struct mpls_domain_config *domain;
struct mpls_range_config *range;
uint label_policy;
};
struct mpls_channel {
struct channel c;
struct mpls_domain *domain;
struct mpls_range *range;
uint label_policy;
};
void mpls_channel_postconfig(struct channel_config *CF);
extern struct channel_class channel_mpls;
struct mpls_fec {
u32 label; /* Label for FEC */
u32 hash; /* Hash for primary key (net / rta) */
u32 uc; /* Number of LSPs for FEC */
union { /* Extension part of key */
u32 path_id; /* Source path_id */
u32 class_id; /* Aaggregation class */
};
u8 state; /* FEC state (MPLS_FEC_*) */
u8 policy; /* Label policy (MPLS_POLICY_*) */
struct mpls_fec *next_k; /* Next in mpls_fec.net_hash/rta_hash */
struct mpls_fec *next_l; /* Next in mpls_fec.label_hash */
union { /* Primary key */
struct rta *rta;
struct iface *iface;
net_addr net[0];
};
};
struct mpls_fec_map {
pool *pool; /* Pool for FEC map */
slab *slabs[4]; /* Slabs for FEC allocation */
HASH(struct mpls_fec) net_hash; /* Hash table for MPLS_POLICY_PREFIX FECs */
HASH(struct mpls_fec) rta_hash; /* Hash table for MPLS_POLICY_AGGREGATE FECs */
HASH(struct mpls_fec) label_hash; /* Hash table for FEC lookup by label */
struct mpls_fec *vrf_fec; /* Single FEC for MPLS_POLICY_VRF */
struct channel *channel; /* MPLS channel for FEC announcement */
struct mpls_domain *domain; /* MPLS domain, keeping reference */
struct mpls_handle *handle; /* Handle for allocation of labels */
struct mpls_handle *static_handle; /* Handle for static label allocations, optional */
struct iface *vrf_iface;
u8 mpls_rts; /* Source value used for MPLS routes (RTS_*) */
u8 mpls_scope; /* Scope value used for MPLS routes (SCOPE_*) */
};
struct mpls_fec_map *mpls_fec_map_new(pool *p, struct channel *c, uint rts);
void mpls_fec_map_free(struct mpls_fec_map *m);
struct mpls_fec *mpls_find_fec_by_label(struct mpls_fec_map *x, u32 label);
struct mpls_fec *mpls_get_fec_by_label(struct mpls_fec_map *m, u32 label);
struct mpls_fec *mpls_get_fec_by_net(struct mpls_fec_map *m, const net_addr *net, u32 path_id);
struct mpls_fec *mpls_get_fec_by_rta(struct mpls_fec_map *m, const rta *src, u32 class_id);
void mpls_free_fec(struct mpls_fec_map *x, struct mpls_fec *fec);
int mpls_handle_rte(struct mpls_fec_map *m, const net_addr *n, rte *r, linpool *lp, struct mpls_fec **locked_fec);
void mpls_handle_rte_cleanup(struct mpls_fec_map *m, struct mpls_fec **locked_fec);
void mpls_rte_insert(net *n UNUSED, rte *r);
void mpls_rte_remove(net *n UNUSED, rte *r);
struct mpls_show_ranges_cmd {
struct mpls_domain_config *domain;
struct mpls_range_config *range;
/* Runtime */
struct mpls_domain *dom;
};
void mpls_show_ranges(struct mpls_show_ranges_cmd *cmd);
#endif
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