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9ca86ef69c
The new labeling policy MPLS_POLICY_VRF assigns one label to all routes (from the same FEC map associated with one VRF), while replaces their next hops with a lookup to a VRF table. This is useful for L3VPN protocol.
143 lines
3.6 KiB
Plaintext
143 lines
3.6 KiB
Plaintext
/*
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* BIRD Internet Routing Daemon -- MPLS Structures
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*
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* (c) 2022 Ondrej Zajicek <santiago@crfreenet.org>
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* (c) 2022 CZ.NIC z.s.p.o.
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*
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* Can be freely distributed and used under the terms of the GNU GPL.
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*/
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CF_HDR
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#include "nest/mpls.h"
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CF_DEFINES
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static struct mpls_domain_config *this_mpls_domain;
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static struct mpls_range_config *this_mpls_range;
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#define MPLS_CC ((struct mpls_channel_config *) this_channel)
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CF_DECLS
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CF_KEYWORDS(MPLS, DOMAIN, LABEL, RANGE, STATIC, DYNAMIC, START, LENGTH, POLICY, PREFIX, AGGREGATE, VRF)
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%type <i> mpls_label_policy
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%type <cc> mpls_channel_start mpls_channel
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CF_GRAMMAR
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conf: mpls_domain;
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mpls_domain: mpls_domain_start mpls_domain_opt_list mpls_domain_end;
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mpls_domain_start: MPLS DOMAIN symbol { this_mpls_domain = mpls_domain_config_new($3); };
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mpls_domain_opt:
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mpls_range
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;
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mpls_domain_opts:
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/* empty */
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| mpls_domain_opts mpls_domain_opt ';'
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;
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mpls_domain_opt_list:
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/* empty */
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| '{' mpls_domain_opts '}'
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;
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mpls_domain_end: { mpls_domain_postconfig(this_mpls_domain); this_mpls_domain = NULL; };
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mpls_range: mpls_range_start mpls_range_opt_list mpls_range_end;
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mpls_range_start: LABEL RANGE symbol
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{
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if (($3->class == SYM_KEYWORD) && ($3->keyword->value == STATIC))
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this_mpls_range = this_mpls_domain->static_range;
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else if (($3->class == SYM_KEYWORD) && ($3->keyword->value == DYNAMIC))
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this_mpls_range = this_mpls_domain->dynamic_range;
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else
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this_mpls_range = mpls_range_config_new(this_mpls_domain, $3);
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};
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mpls_range_opt:
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START expr { this_mpls_range->start = $2; if ($2 >= MPLS_MAX_LABEL) cf_error("MPLS label range start must be less than 2^20"); }
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| 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"); }
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;
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mpls_range_opts:
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/* empty */
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| mpls_range_opts mpls_range_opt ';'
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;
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mpls_range_opt_list:
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/* empty */
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| '{' mpls_range_opts '}'
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;
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mpls_range_end:
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{
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struct mpls_range_config *r = this_mpls_range;
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if ((r->start == (uint) -1) || (r->length == (uint) -1))
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cf_error("MPLS label range start and length must be specified");
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if (r->start + r->length > MPLS_MAX_LABEL)
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cf_error("MPLS label range end must be less than 2^20");
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this_mpls_range = NULL;
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};
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mpls_channel: mpls_channel_start mpls_channel_opt_list mpls_channel_end;
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mpls_channel_start: MPLS
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{
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$$ = this_channel = channel_config_get(&channel_mpls, net_label[NET_MPLS], NET_MPLS, this_proto);
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if (EMPTY_LIST(new_config->mpls_domains))
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cf_error("No MPLS domain defined");
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/* Default values for new channel */
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if (!MPLS_CC->domain)
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{
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MPLS_CC->domain = cf_default_mpls_domain(new_config);
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MPLS_CC->label_policy = MPLS_POLICY_PREFIX;
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}
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};
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mpls_label_policy:
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STATIC { $$ = MPLS_POLICY_STATIC; }
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| PREFIX { $$ = MPLS_POLICY_PREFIX; }
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| AGGREGATE { $$ = MPLS_POLICY_AGGREGATE; }
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| VRF { $$ = MPLS_POLICY_VRF; }
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;
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mpls_channel_opt:
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channel_item
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| DOMAIN symbol_known { cf_assert_symbol($2, SYM_MPLS_DOMAIN); MPLS_CC->domain = $2->mpls_domain; }
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| LABEL RANGE symbol_known { cf_assert_symbol($3, SYM_MPLS_RANGE); MPLS_CC->range = $3->mpls_range; }
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| LABEL RANGE STATIC { MPLS_CC->range = MPLS_CC->domain->static_range; }
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| LABEL RANGE DYNAMIC { MPLS_CC->range = MPLS_CC->domain->dynamic_range; }
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| LABEL POLICY mpls_label_policy { MPLS_CC->label_policy = $3; }
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;
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mpls_channel_opts:
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/* empty */
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| mpls_channel_opts mpls_channel_opt ';'
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;
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mpls_channel_opt_list:
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/* empty */
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| '{' mpls_channel_opts '}'
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;
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mpls_channel_end: { mpls_channel_postconfig(this_channel); } channel_end;
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CF_CODE
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CF_END
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