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The L3VPN protocol implements RFC 4364 BGP/MPLS VPNs using MPLS backbone. It works similarly to pipe. It connects IP table (one per VRF) with (global) VPN table. Routes passed from VPN table to IP table are stripped of RD and filtered by import targets, routes passed in the other direction are extended with RD, MPLS labels and export targets in extended communities. A separate MPLS channel is used to announce MPLS routes for the labels.
102 lines
2.1 KiB
Plaintext
102 lines
2.1 KiB
Plaintext
/*
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* BIRD -- BGP/MPLS IP Virtual Private Networks (L3VPN)
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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 "proto/l3vpn/l3vpn.h"
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CF_DEFINES
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#define L3VPN_CFG ((struct l3vpn_config *) this_proto)
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static void
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f_tree_only_rt(struct f_tree *t)
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{
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/* Parsed degenerate trees have link to the last node in t->right */
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t->right = NULL;
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while (t)
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{
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uint type1 = t->from.val.ec >> 48;
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uint type2 = t->to.val.ec >> 48;
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ASSERT(type1 == type2);
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if (!ec_type_is_rt(type1))
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cf_error("Extended community is not route target");
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ASSERT(!t->right);
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t = t->left;
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}
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}
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CF_DECLS
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CF_KEYWORDS(L3VPN, ROUTE, IMPORT, EXPORT, TARGET, RD, DISTINGUISHER)
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%type <e> l3vpn_targets
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%type <cc> l3vpn_channel_start l3vpn_channel
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CF_GRAMMAR
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proto: l3vpn_proto;
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l3vpn_channel_start: net_type_base
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{
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/* Redefining proto_channel to change default values */
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$$ = this_channel = channel_config_get(NULL, net_label[$1], $1, this_proto);
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if (!this_channel->copy)
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{
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this_channel->out_filter = FILTER_ACCEPT;
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this_channel->preference = net_val_match($1, NB_IP) ?
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DEF_PREF_L3VPN_IMPORT :
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DEF_PREF_L3VPN_EXPORT;
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}
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};
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l3vpn_channel: l3vpn_channel_start channel_opt_list channel_end;
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l3vpn_proto_start: proto_start L3VPN
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{
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this_proto = proto_config_new(&proto_l3vpn, $1);
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};
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l3vpn_proto_item:
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proto_item
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| l3vpn_channel
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| mpls_channel
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| RD VPN_RD { L3VPN_CFG->rd = $2; }
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| ROUTE DISTINGUISHER VPN_RD { L3VPN_CFG->rd = $3; }
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| IMPORT TARGET l3vpn_targets { L3VPN_CFG->import_target = $3; }
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| EXPORT TARGET l3vpn_targets { L3VPN_CFG->export_target = $3; }
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| ROUTE TARGET l3vpn_targets { L3VPN_CFG->import_target = L3VPN_CFG->export_target = $3; }
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;
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l3vpn_proto_opts:
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/* empty */
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| l3vpn_proto_opts l3vpn_proto_item ';'
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;
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l3vpn_proto:
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l3vpn_proto_start proto_name '{' l3vpn_proto_opts '}';
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l3vpn_targets:
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ec_item { f_tree_only_rt($1); $$ = $1; }
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| '[' ec_items ']' { f_tree_only_rt($2); $$ = build_tree($2); }
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;
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CF_CODE
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CF_END
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