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BGP: implement Adj-RIB-In

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The patch implements optional internal import table to a channel and
hooks it to BGP so it can be used as Adj-RIB-In. When enabled, all
received (pre-filtered) routes are stored there and import filters can
be re-evaluated without explicit route refresh. An import table can be
examined using e.g. 'show route import table bgp1.ipv4'.
This commit is contained in:
Ondrej Zajicek (work)
2018-09-27 22:57:55 +02:00
parent 01fd00f5ed
commit 682d3f7de0
9 changed files with 235 additions and 8 deletions
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59
nest/proto.c
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@@ -284,6 +284,54 @@ channel_stop_export(struct channel *c)
c->stats.exp_routes = 0;
}
/* Called by protocol for reload from in_table */
void
channel_schedule_reload(struct channel *c)
{
ASSERT(c->channel_state == CS_UP);
rt_reload_channel_abort(c);
ev_schedule(c->reload_event);
}
static void
channel_reload_loop(void *ptr)
{
struct channel *c = ptr;
if (!rt_reload_channel(c))
{
ev_schedule(c->reload_event);
return;
}
}
static void
channel_reset_import(struct channel *c)
{
/* Need to abort feeding */
ev_postpone(c->reload_event);
rt_reload_channel_abort(c);
rt_prune_sync(c->in_table, 1);
}
/* Called by protocol to activate in_table */
void
channel_setup_in_table(struct channel *c)
{
struct rtable_config *cf = mb_allocz(c->proto->pool, sizeof(struct rtable_config));
cf->name = "import";
cf->addr_type = c->net_type;
c->in_table = mb_allocz(c->proto->pool, sizeof(struct rtable));
rt_setup(c->proto->pool, c->in_table, cf);
c->reload_event = ev_new_init(c->proto->pool, channel_reload_loop, c);
}
static void
channel_do_start(struct channel *c)
{
@@ -315,6 +363,8 @@ channel_do_flush(struct channel *c)
static void
channel_do_down(struct channel *c)
{
ASSERT(!c->feed_active && !c->reload_active);
rem_node(&c->table_node);
rt_unlock_table(c->table);
c->proto->active_channels--;
@@ -324,6 +374,9 @@ channel_do_down(struct channel *c)
memset(&c->stats, 0, sizeof(struct proto_stats));
c->in_table = NULL;
c->reload_event = NULL;
CALL(c->channel->cleanup, c);
/* Schedule protocol shutddown */
@@ -355,6 +408,9 @@ channel_set_state(struct channel *c, uint state)
if (es != ES_DOWN)
channel_stop_export(c);
if (c->in_table && (cs == CS_UP))
channel_reset_import(c);
break;
case CS_UP:
@@ -374,6 +430,9 @@ channel_set_state(struct channel *c, uint state)
if (es != ES_DOWN)
channel_stop_export(c);
if (c->in_table && (cs == CS_UP))
channel_reset_import(c);
channel_do_flush(c);
break;