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-rw-r--r--src/vnet/gre/interface.c32
1 files changed, 32 insertions, 0 deletions
diff --git a/src/vnet/gre/interface.c b/src/vnet/gre/interface.c
index 59bf21d6dc2..178b080a73b 100644
--- a/src/vnet/gre/interface.c
+++ b/src/vnet/gre/interface.c
@@ -203,10 +203,14 @@ gre_nhrp_mk_key (const gre_tunnel_t * t,
t->type, TUNNEL_MODE_P2P, 0, &key->gtk_v6);
}
+/**
+ * An NHRP entry has been added
+ */
static void
gre_nhrp_entry_added (const nhrp_entry_t * ne)
{
gre_main_t *gm = &gre_main;
+ const ip46_address_t *nh;
gre_tunnel_key_t key;
gre_tunnel_t *t;
u32 sw_if_index;
@@ -221,16 +225,35 @@ gre_nhrp_entry_added (const nhrp_entry_t * ne)
if (INDEX_INVALID == t_idx)
return;
+ /* entry has been added on an interface for which there is a GRE tunnel */
t = pool_elt_at_index (gm->tunnels, t_idx);
+ if (t->mode != TUNNEL_MODE_MP)
+ return;
+
+ /* the next-hop (underlay) of the NHRP entry will form part of the key for
+ * ingress lookup to match packets to this interface */
gre_nhrp_mk_key (t, ne, &key);
gre_tunnel_db_add (t, &key);
+
+ /* update the rewrites for each of the adjacencies for this peer (overlay)
+ * using the next-hop (underlay) */
+ mgre_walk_ctx_t ctx = {
+ .t = t,
+ .ne = ne
+ };
+ nh = nhrp_entry_get_peer (ne);
+ adj_nbr_walk_nh (nhrp_entry_get_sw_if_index (ne),
+ (ip46_address_is_ip4 (nh) ?
+ FIB_PROTOCOL_IP4 :
+ FIB_PROTOCOL_IP6), nh, mgre_mk_complete_walk, &ctx);
}
static void
gre_nhrp_entry_deleted (const nhrp_entry_t * ne)
{
gre_main_t *gm = &gre_main;
+ const ip46_address_t *nh;
gre_tunnel_key_t key;
gre_tunnel_t *t;
u32 sw_if_index;
@@ -247,8 +270,17 @@ gre_nhrp_entry_deleted (const nhrp_entry_t * ne)
t = pool_elt_at_index (gm->tunnels, t_idx);
+ /* remove the next-hop as an ingress lookup key */
gre_nhrp_mk_key (t, ne, &key);
gre_tunnel_db_remove (t, &key);
+
+ nh = nhrp_entry_get_peer (ne);
+
+ /* make all the adjacencies incomplete */
+ adj_nbr_walk_nh (nhrp_entry_get_sw_if_index (ne),
+ (ip46_address_is_ip4 (nh) ?
+ FIB_PROTOCOL_IP4 :
+ FIB_PROTOCOL_IP6), nh, mgre_mk_incomplete_walk, t);
}
static walk_rc_t