BGP: implement Adj-RIB-Out (b7d7599c) · Commits · 戴 / Bird

doc/bird.sgml

+10 −0

Original line number	Diff line number	Diff line
		@@ -2705,6 +2705,16 @@ be used in explicit configuration.
		be examined later by <cf/show route/, and can be used to reconfigure
		import filters without full route refresh. Default: off.

		<tag><label id="bgp-export-table">export table <m/switch/</tag>
		A BGP export table contains all routes sent to given BGP neighbor, after
		application of export filters. It is also called <em/Adj-RIB-Out/ in BGP
		terminology. BIRD BGP by default operates without export tables, in
		which case routes from master table are just processed by export filters
		and then announced by BGP. Enabling <cf/export table/ allows to store
		routes after export filter processing, so they can be examined later by
		<cf/show route/, and can be used to eliminate unnecessary updates or
		withdraws. Default: off.

		<tag><label id="bgp-secondary">secondary <m/switch/</tag>
		Usually, if an export filter rejects a selected route, no other route is
		propagated for that network. This option allows to try the next route in

+11 −0

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		@@ -567,6 +567,17 @@ r_args:
		rt_show_add_table($$, c->in_table);
		$$->tables_defined_by = RSD_TDB_DIRECT;
		}
		\| r_args EXPORT TABLE CF_SYM_KNOWN '.' r_args_channel {
		cf_assert_symbol($4, SYM_PROTO);
		$$ = $1;
		struct proto_config *cf = $4->proto;
		if (!cf->proto) cf_error("%s is not a protocol", $4->name);
		struct channel *c = proto_find_channel_by_name(cf->proto, $6);
		if (!c) cf_error("Channel %s.%s not found", $4->name, $6);
		if (!c->out_table) cf_error("No export table in channel %s.%s", $4->name, $6);
		rt_show_add_table($$, c->out_table);
		$$->tables_defined_by = RSD_TDB_DIRECT;
		}
		\| r_args FILTER filter {
		$$ = $1;
		if ($$->filter != FILTER_ACCEPT) cf_error("Filter specified twice");

+26 −0

Original line number	Diff line number	Diff line
		@@ -317,6 +317,13 @@ channel_reset_import(struct channel *c)
		rt_prune_sync(c->in_table, 1);
		}

		static void
		channel_reset_export(struct channel *c)
		{
		/* Just free the routes */
		rt_prune_sync(c->out_table, 1);
		}

		/* Called by protocol to activate in_table */
		void
		channel_setup_in_table(struct channel *c)
		@@ -331,6 +338,18 @@ channel_setup_in_table(struct channel *c)
		c->reload_event = ev_new_init(c->proto->pool, channel_reload_loop, c);
		}

		/* Called by protocol to activate out_table */
		void
		channel_setup_out_table(struct channel *c)
		{
		struct rtable_config *cf = mb_allocz(c->proto->pool, sizeof(struct rtable_config));
		cf->name = "export";
		cf->addr_type = c->net_type;

		c->out_table = mb_allocz(c->proto->pool, sizeof(struct rtable));
		rt_setup(c->proto->pool, c->out_table, cf);
		}


		static void
		channel_do_start(struct channel *c)
		@@ -376,6 +395,7 @@ channel_do_down(struct channel *c)

		c->in_table = NULL;
		c->reload_event = NULL;
		c->out_table = NULL;

		CALL(c->channel->cleanup, c);

		@@ -411,6 +431,9 @@ channel_set_state(struct channel *c, uint state)
		if (c->in_table && (cs == CS_UP))
		channel_reset_import(c);

		if (c->out_table && (cs == CS_UP))
		channel_reset_export(c);

		break;

		case CS_UP:
		@@ -433,6 +456,9 @@ channel_set_state(struct channel *c, uint state)
		if (c->in_table && (cs == CS_UP))
		channel_reset_import(c);

		if (c->out_table && (cs == CS_UP))
		channel_reset_export(c);

		channel_do_flush(c);
		break;

+3 −0

Original line number	Diff line number	Diff line
		@@ -539,6 +539,8 @@ struct channel {
		struct event reload_event; / Event responsible for reloading from in_table */
		struct fib_iterator reload_fit; /* Iterator in in_table used during reloading */
		u8 reload_active; /* Iterator reload_fit is linked */

		struct rtable out_table; / Internal table for exported routes */
		};


		@@ -607,6 +609,7 @@ int proto_configure_channel(struct proto p, struct channel *c, struct channel_

		void channel_set_state(struct channel *c, uint state);
		void channel_setup_in_table(struct channel *c);
		void channel_setup_out_table(struct channel *c);
		void channel_schedule_reload(struct channel *c);

		static inline void channel_init(struct channel *c) { channel_set_state(c, CS_START); }

+1 −0

Original line number	Diff line number	Diff line
		@@ -320,6 +320,7 @@ int rte_update_in(struct channel c, const net_addr n, rte *new, struct rte_src
		int rt_reload_channel(struct channel *c);
		void rt_reload_channel_abort(struct channel *c);
		void rt_prune_sync(rtable *t, int all);
		int rte_update_out(struct channel c, const net_addr n, rte new, rte old0, int refeed);
		struct rtable_config rt_new_table(struct symbol s, uint addr_type);