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Zebra: Default route distribute handling.

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When default route is requested from client, default
route is sent to client if present. When route gets
deleted then delete is sent to clients.

Signed-off-by: Santosh P K <sapk@vmware.com>
This commit is contained in:
Santosh P K 2020-04-07 07:02:21 -07:00
parent cd05906c41
commit 14fe366eab
1 changed files with 47 additions and 63 deletions
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110
zebra/redistribute.c
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@ -150,6 +150,43 @@ static void zebra_redistribute(struct zserv *client, int type,
}
}
/*
* Function to check if prefix is candidate for
* redistribute.
*/
static bool zebra_redistribute_check(const struct route_entry *re,
struct zserv *client,
const struct prefix *p, int afi)
{
/* Process only if there is valid re */
if (!re)
return false;
/* If default route and redistributed */
if (is_default_prefix(p)
&& vrf_bitmap_check(client->redist_default[afi], re->vrf_id))
return true;
/* If redistribute in enabled for zebra route all */
if (vrf_bitmap_check(client->redist[afi][ZEBRA_ROUTE_ALL], re->vrf_id))
return true;
/*
* If multi-instance then check for route
* redistribution for given instance.
*/
if (re->instance
&& redist_check_instance(&client->mi_redist[afi][re->type],
re->instance))
return true;
/* If redistribution is enabled for give route type. */
if (vrf_bitmap_check(client->redist[afi][re->type], re->vrf_id))
return true;
return false;
}
/* Either advertise a route for redistribution to registered clients or */
/* withdraw redistribution if add cannot be done for client */
void redistribute_update(const struct prefix *p, const struct prefix *src_p,
@ -158,7 +195,6 @@ void redistribute_update(const struct prefix *p, const struct prefix *src_p,
{
struct listnode *node, *nnode;
struct zserv *client;
int send_redistribute;
int afi;
char buf[PREFIX_STRLEN];
@ -185,25 +221,7 @@ void redistribute_update(const struct prefix *p, const struct prefix *src_p,
for (ALL_LIST_ELEMENTS(zrouter.client_list, node, nnode, client)) {
send_redistribute = 0;
if (is_default_prefix(p)
&& vrf_bitmap_check(client->redist_default[afi],
re->vrf_id))
send_redistribute = 1;
else if (vrf_bitmap_check(client->redist[afi][ZEBRA_ROUTE_ALL],
re->vrf_id))
send_redistribute = 1;
else if (re->instance
&& redist_check_instance(
&client->mi_redist[afi][re->type],
re->instance))
send_redistribute = 1;
else if (vrf_bitmap_check(client->redist[afi][re->type],
re->vrf_id))
send_redistribute = 1;
if (send_redistribute) {
if (zebra_redistribute_check(re, client, p, afi)) {
if (IS_ZEBRA_DEBUG_RIB) {
zlog_debug(
"%s: client %s %s(%u), type=%d, distance=%d, metric=%d",
@ -215,18 +233,9 @@ void redistribute_update(const struct prefix *p, const struct prefix *src_p,
}
zsend_redistribute_route(ZEBRA_REDISTRIBUTE_ROUTE_ADD,
client, p, src_p, re);
} else if (prev_re
&& ((re->instance
&& redist_check_instance(
&client->mi_redist[afi]
[prev_re->type],
re->instance))
|| vrf_bitmap_check(
client->redist[afi][prev_re->type],
re->vrf_id))) {
} else if (zebra_redistribute_check(prev_re, client, p, afi))
zsend_redistribute_route(ZEBRA_REDISTRIBUTE_ROUTE_DEL,
client, p, src_p, prev_re);
}
}
}
@ -294,46 +303,21 @@ void redistribute_delete(const struct prefix *p, const struct prefix *src_p,
/* Do not send unsolicited messages to synchronous clients. */
if (client->synchronous)
continue;
if (new_re) {
/* Skip this client if it will receive an update for the
* 'new' re
*/
if (is_default_prefix(p)
&& vrf_bitmap_check(client->redist_default[afi],
new_re->vrf_id))
continue;
else if (vrf_bitmap_check(
client->redist[afi][ZEBRA_ROUTE_ALL],
new_re->vrf_id))
continue;
else if (new_re->instance
&& redist_check_instance(
&client->mi_redist[afi][new_re->type],
new_re->instance))
continue;
else if (vrf_bitmap_check(
client->redist[afi][new_re->type],
new_re->vrf_id))
continue;
}
/*
* Skip this client if it will receive an update for the
* 'new' re
*/
if (zebra_redistribute_check(new_re, client, p, afi))
continue;
/* Send a delete for the 'old' re to any subscribed client. */
if (old_re
&& (vrf_bitmap_check(client->redist[afi][ZEBRA_ROUTE_ALL],
old_re->vrf_id)
|| (old_re->instance
&& redist_check_instance(
&client->mi_redist[afi][old_re->type],
old_re->instance))
|| vrf_bitmap_check(client->redist[afi][old_re->type],
old_re->vrf_id))) {
if (zebra_redistribute_check(old_re, client, p, afi))
zsend_redistribute_route(ZEBRA_REDISTRIBUTE_ROUTE_DEL,
client, p, src_p, old_re);
}
}
}
void zebra_redistribute_add(ZAPI_HANDLER_ARGS)
{
afi_t afi = 0;