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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.
*/
CF_HDR
#include "nest/mpls.h"
CF_DEFINES
static struct mpls_domain_config *this_mpls_domain;
static struct mpls_range_config *this_mpls_range;
#define MPLS_CC ((struct mpls_channel_config *) this_channel)
CF_DECLS
CF_KEYWORDS(MPLS, DOMAIN, LABEL, RANGE, STATIC, DYNAMIC, START, LENGTH, POLICY, PREFIX, AGGREGATE)
%type <i> mpls_label_policy
%type <cc> mpls_channel_start mpls_channel
CF_GRAMMAR
conf: mpls_domain;
mpls_domain: mpls_domain_start mpls_domain_opt_list mpls_domain_end;
mpls_domain_start: MPLS DOMAIN symbol { this_mpls_domain = mpls_domain_config_new($3); };
mpls_domain_opt:
mpls_range
;
mpls_domain_opts:
/* empty */
| mpls_domain_opts mpls_domain_opt ';'
;
mpls_domain_opt_list:
/* empty */
| '{' mpls_domain_opts '}'
;
mpls_domain_end: { mpls_domain_postconfig(this_mpls_domain); this_mpls_domain = NULL; };
mpls_range: mpls_range_start mpls_range_opt_list mpls_range_end;
mpls_range_start: LABEL RANGE symbol
{
if (($3->class == SYM_KEYWORD) && ($3->keyword->value == STATIC))
this_mpls_range = this_mpls_domain->static_range;
else if (($3->class == SYM_KEYWORD) && ($3->keyword->value == DYNAMIC))
this_mpls_range = this_mpls_domain->dynamic_range;
else
this_mpls_range = mpls_range_config_new(this_mpls_domain, $3);
};
mpls_range_opt:
START expr { this_mpls_range->start = $2; if ($2 >= MPLS_MAX_LABEL) cf_error("MPLS label range start must be less than 2^20"); }
| LENGTH expr { this_mpls_range->length = $2; if ($2 >= MPLS_MAX_LABEL) cf_error("MPLS label range length must be less than 2^20"); if (!$2) cf_error("MPLS label range length must be nonzero"); }
;
mpls_range_opts:
/* empty */
| mpls_range_opts mpls_range_opt ';'
;
mpls_range_opt_list:
/* empty */
| '{' mpls_range_opts '}'
;
mpls_range_end:
{
struct mpls_range_config *r = this_mpls_range;
if ((r->start == (uint) -1) || (r->length == (uint) -1))
cf_error("MPLS label range start and length must be specified");
if (r->start + r->length > MPLS_MAX_LABEL)
cf_error("MPLS label range end must be less than 2^20");
this_mpls_range = NULL;
};
mpls_channel: mpls_channel_start mpls_channel_opt_list mpls_channel_end;
mpls_channel_start: MPLS
{
$$ = this_channel = channel_config_get(&channel_mpls, net_label[NET_MPLS], NET_MPLS, this_proto);
if (EMPTY_LIST(new_config->mpls_domains))
cf_error("No MPLS domain defined");
/* Default values for new channel */
if (!MPLS_CC->domain)
{
MPLS_CC->domain = cf_default_mpls_domain(new_config);
MPLS_CC->label_policy = MPLS_POLICY_PREFIX;
}
};
mpls_label_policy:
STATIC { $$ = MPLS_POLICY_STATIC; }
| PREFIX { $$ = MPLS_POLICY_PREFIX; }
| AGGREGATE { $$ = MPLS_POLICY_AGGREGATE; }
;
mpls_channel_opt:
channel_item
| DOMAIN symbol_known { cf_assert_symbol($2, SYM_MPLS_DOMAIN); MPLS_CC->domain = $2->mpls_domain; }
| LABEL RANGE symbol_known { cf_assert_symbol($3, SYM_MPLS_RANGE); MPLS_CC->range = $3->mpls_range; }
| LABEL RANGE STATIC { MPLS_CC->range = MPLS_CC->domain->static_range; }
| LABEL RANGE DYNAMIC { MPLS_CC->range = MPLS_CC->domain->dynamic_range; }
| LABEL POLICY mpls_label_policy { MPLS_CC->label_policy = $3; }
;
mpls_channel_opts:
/* empty */
| mpls_channel_opts mpls_channel_opt ';'
;
mpls_channel_opt_list:
/* empty */
| '{' mpls_channel_opts '}'
;
mpls_channel_end: { mpls_channel_postconfig(this_channel); } channel_end;
CF_CODE
CF_END
|
