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zebra: fix crash seen on VxLAN SG table cleanup done as a part of vrf disable

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There are two fixes in this commit -
1. Prevent implicit deletion of (*,G) entries during (S,G) cleanup.
This is done by creating a dummy reference on all (*,G) entries.
This is needed for a hash-walk based table cleanup.
2. Free up the SG hash table when the VRF is deleted.

Ticket: CM-30151

Signed-off-by: Anuradha Karuppiah <anuradhak@cumulusnetworks.com>
This commit is contained in:
Anuradha Karuppiah 2020-06-28 08:56:03 -07:00 committed by Anuradha Karuppiah
parent d149c75aa1
commit 0c16fb7262
1 changed files with 44 additions and 2 deletions
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46
zebra/zebra_vxlan.c
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@ -116,7 +116,7 @@ static void zebra_vxlan_sg_deref(struct in_addr local_vtep_ip,
struct in_addr mcast_grp);
static void zebra_vxlan_sg_ref(struct in_addr local_vtep_ip,
struct in_addr mcast_grp);
static void zebra_vxlan_sg_cleanup(struct hash_bucket *bucket, void *arg);
static void zebra_vxlan_cleanup_sg_table(struct zebra_vrf *zvrf);
/* Private functions */
static int host_rb_entry_compare(const struct host_rb_entry *hle1,
@ -5658,7 +5658,7 @@ void zebra_vxlan_cleanup_tables(struct zebra_vrf *zvrf)
if (!zvrf)
return;
hash_iterate(zvrf->evpn_table, zebra_evpn_vxlan_cleanup_all, zvrf);
hash_iterate(zvrf->vxlan_sg_table, zebra_vxlan_sg_cleanup, NULL);
zebra_vxlan_cleanup_sg_table(zvrf);
if (zvrf == evpn_zvrf)
zebra_evpn_es_cleanup();
@ -5671,6 +5671,11 @@ void zebra_vxlan_close_tables(struct zebra_vrf *zvrf)
return;
hash_iterate(zvrf->evpn_table, zebra_evpn_vxlan_cleanup_all, zvrf);
hash_free(zvrf->evpn_table);
if (zvrf->vxlan_sg_table) {
zebra_vxlan_cleanup_sg_table(zvrf);
hash_free(zvrf->vxlan_sg_table);
zvrf->vxlan_sg_table = NULL;
}
}
/* init the l3vni table */
@ -5919,6 +5924,30 @@ static void zebra_vxlan_sg_ref(struct in_addr local_vtep_ip,
zebra_vxlan_sg_do_ref(zvrf, local_vtep_ip, mcast_grp);
}
static void zebra_vxlan_xg_pre_cleanup(struct hash_bucket *backet, void *arg)
{
zebra_vxlan_sg_t *vxlan_sg = (zebra_vxlan_sg_t *)backet->data;
/* increment the ref count against (*,G) to prevent them from being
* deleted
*/
if (vxlan_sg->sg.src.s_addr == INADDR_ANY)
++vxlan_sg->ref_cnt;
}
static void zebra_vxlan_xg_post_cleanup(struct hash_bucket *backet, void *arg)
{
zebra_vxlan_sg_t *vxlan_sg = (zebra_vxlan_sg_t *)backet->data;
/* decrement the dummy ref count against (*,G) to delete them */
if (vxlan_sg->sg.src.s_addr == INADDR_ANY) {
if (vxlan_sg->ref_cnt)
--vxlan_sg->ref_cnt;
if (!vxlan_sg->ref_cnt)
zebra_vxlan_sg_del(vxlan_sg);
}
}
static void zebra_vxlan_sg_cleanup(struct hash_bucket *backet, void *arg)
{
zebra_vxlan_sg_t *vxlan_sg = (zebra_vxlan_sg_t *)backet->data;
@ -5926,6 +5955,19 @@ static void zebra_vxlan_sg_cleanup(struct hash_bucket *backet, void *arg)
zebra_vxlan_sg_del(vxlan_sg);
}
static void zebra_vxlan_cleanup_sg_table(struct zebra_vrf *zvrf)
{
/* increment the ref count against (*,G) to prevent them from being
* deleted
*/
hash_iterate(zvrf->vxlan_sg_table, zebra_vxlan_xg_pre_cleanup, NULL);
hash_iterate(zvrf->vxlan_sg_table, zebra_vxlan_sg_cleanup, NULL);
/* decrement the dummy ref count against the XG entries */
hash_iterate(zvrf->vxlan_sg_table, zebra_vxlan_xg_post_cleanup, NULL);
}
static void zebra_vxlan_sg_replay_send(struct hash_bucket *backet, void *arg)
{
zebra_vxlan_sg_t *vxlan_sg = (zebra_vxlan_sg_t *)backet->data;