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-rw-r--r--src/vnet/ethernet/arp.c138
1 files changed, 69 insertions, 69 deletions
diff --git a/src/vnet/ethernet/arp.c b/src/vnet/ethernet/arp.c
index 49a16f764f3..249e3b6e8cf 100644
--- a/src/vnet/ethernet/arp.c
+++ b/src/vnet/ethernet/arp.c
@@ -545,6 +545,62 @@ arp_adj_fib_add (ethernet_arp_ip4_entry_t * e, u32 fib_index)
fib_table_lock (fib_index, FIB_PROTOCOL_IP4, FIB_SOURCE_ADJ);
}
+void
+arp_adj_fib_remove (ethernet_arp_ip4_entry_t * e, u32 fib_index)
+{
+ if (FIB_NODE_INDEX_INVALID != e->fib_entry_index)
+ {
+ fib_prefix_t pfx = {
+ .fp_len = 32,
+ .fp_proto = FIB_PROTOCOL_IP4,
+ .fp_addr.ip4 = e->ip4_address,
+ };
+ u32 fib_index;
+
+ fib_index = ip4_fib_table_get_index_for_sw_if_index (e->sw_if_index);
+
+ fib_table_entry_path_remove (fib_index, &pfx,
+ FIB_SOURCE_ADJ,
+ DPO_PROTO_IP4,
+ &pfx.fp_addr,
+ e->sw_if_index, ~0, 1,
+ FIB_ROUTE_PATH_FLAG_NONE);
+ fib_table_unlock (fib_index, FIB_PROTOCOL_IP4, FIB_SOURCE_ADJ);
+ }
+}
+
+static ethernet_arp_ip4_entry_t *
+force_reuse_arp_entry (void)
+{
+ ethernet_arp_ip4_entry_t *e;
+ ethernet_arp_main_t *am = &ethernet_arp_main;
+ u32 count = 0;
+ u32 index = pool_next_index (am->ip4_entry_pool, am->arp_delete_rotor);
+ if (index == ~0) /* Try again from elt 0 */
+ index = pool_next_index (am->ip4_entry_pool, index);
+
+ /* Find a non-static random entry to free up for reuse */
+ do
+ {
+ if ((count++ == 100) || (index == ~0))
+ return NULL; /* give up after 100 entries */
+ e = pool_elt_at_index (am->ip4_entry_pool, index);
+ am->arp_delete_rotor = index;
+ index = pool_next_index (am->ip4_entry_pool, index);
+ }
+ while (e->flags & ETHERNET_ARP_IP4_ENTRY_FLAG_STATIC);
+
+ /* Remove ARP entry from its interface and update fib */
+ hash_unset
+ (am->ethernet_arp_by_sw_if_index[e->sw_if_index].arp_entries,
+ e->ip4_address.as_u32);
+ arp_adj_fib_remove
+ (e, ip4_fib_table_get_index_for_sw_if_index (e->sw_if_index));
+ adj_nbr_walk_nh4 (e->sw_if_index,
+ &e->ip4_address, arp_mk_incomplete_walk, NULL);
+ return e;
+}
+
static int
vnet_arp_set_ip4_over_ethernet_internal (vnet_main_t * vnm,
vnet_arp_set_ip4_over_ethernet_rpc_args_t
@@ -582,12 +638,18 @@ vnet_arp_set_ip4_over_ethernet_internal (vnet_main_t * vnm,
if (make_new_arp_cache_entry)
{
- pool_get (am->ip4_entry_pool, e);
-
- if (NULL == arp_int->arp_entries)
+ if (am->limit_arp_cache_size &&
+ pool_elts (am->ip4_entry_pool) >= am->limit_arp_cache_size)
{
- arp_int->arp_entries = hash_create (0, sizeof (u32));
+ e = force_reuse_arp_entry ();
+ if (NULL == e)
+ return -2;
}
+ else
+ pool_get (am->ip4_entry_pool, e);
+
+ if (NULL == arp_int->arp_entries)
+ arp_int->arp_entries = hash_create (0, sizeof (u32));
hash_set (arp_int->arp_entries, a->ip4.as_u32, e - am->ip4_entry_pool);
@@ -820,38 +882,6 @@ typedef enum
ETHERNET_ARP_N_ERROR,
} ethernet_arp_input_error_t;
-
-static void
-unset_random_arp_entry (void)
-{
- ethernet_arp_main_t *am = &ethernet_arp_main;
- ethernet_arp_ip4_entry_t *e;
- vnet_main_t *vnm = vnet_get_main ();
- ethernet_arp_ip4_over_ethernet_address_t delme;
- u32 index;
-
- index = pool_next_index (am->ip4_entry_pool, am->arp_delete_rotor);
- am->arp_delete_rotor = index;
-
- /* Try again from elt 0, could happen if an intfc goes down */
- if (index == ~0)
- {
- index = pool_next_index (am->ip4_entry_pool, am->arp_delete_rotor);
- am->arp_delete_rotor = index;
- }
-
- /* Nothing left in the pool */
- if (index == ~0)
- return;
-
- e = pool_elt_at_index (am->ip4_entry_pool, index);
-
- clib_memcpy (&delme.ethernet, e->ethernet_address, 6);
- delme.ip4.as_u32 = e->ip4_address.as_u32;
-
- vnet_arp_unset_ip4_over_ethernet (vnm, e->sw_if_index, &delme);
-}
-
static int
arp_unnumbered (vlib_buffer_t * p0,
u32 input_sw_if_index, u32 conn_sw_if_index)
@@ -881,10 +911,6 @@ static u32
arp_learn (vnet_main_t * vnm,
ethernet_arp_main_t * am, u32 sw_if_index, void *addr)
{
- if (am->limit_arp_cache_size &&
- pool_elts (am->ip4_entry_pool) >= am->limit_arp_cache_size)
- unset_random_arp_entry ();
-
vnet_arp_set_ip4_over_ethernet (vnm, sw_if_index, addr, 0, 0);
return (ETHERNET_ARP_ERROR_l3_src_address_learned);
}
@@ -1641,30 +1667,6 @@ arp_add_del_interface_address (ip4_main_t * im,
}
}
-void
-arp_adj_fib_remove (ethernet_arp_ip4_entry_t * e, u32 fib_index)
-{
- if (FIB_NODE_INDEX_INVALID != e->fib_entry_index)
- {
- fib_prefix_t pfx = {
- .fp_len = 32,
- .fp_proto = FIB_PROTOCOL_IP4,
- .fp_addr.ip4 = e->ip4_address,
- };
- u32 fib_index;
-
- fib_index = ip4_fib_table_get_index_for_sw_if_index (e->sw_if_index);
-
- fib_table_entry_path_remove (fib_index, &pfx,
- FIB_SOURCE_ADJ,
- DPO_PROTO_IP4,
- &pfx.fp_addr,
- e->sw_if_index, ~0, 1,
- FIB_ROUTE_PATH_FLAG_NONE);
- fib_table_unlock (fib_index, FIB_PROTOCOL_IP4, FIB_SOURCE_ADJ);
- }
-}
-
static void
arp_table_bind (ip4_main_t * im,
uword opaque,
@@ -1761,9 +1763,8 @@ arp_entry_free (ethernet_arp_interface_t * eai, ethernet_arp_ip4_entry_t * e)
{
ethernet_arp_main_t *am = &ethernet_arp_main;
- arp_adj_fib_remove (e,
- ip4_fib_table_get_index_for_sw_if_index
- (e->sw_if_index));
+ arp_adj_fib_remove
+ (e, ip4_fib_table_get_index_for_sw_if_index (e->sw_if_index));
hash_unset (eai->arp_entries, e->ip4_address.as_u32);
pool_put (am->ip4_entry_pool, e);
}
@@ -1786,10 +1787,9 @@ vnet_arp_unset_ip4_over_ethernet_internal (vnet_main_t * vnm,
if (NULL != e)
{
- arp_entry_free (eai, e);
-
adj_nbr_walk_nh4 (e->sw_if_index,
&e->ip4_address, arp_mk_incomplete_walk, NULL);
+ arp_entry_free (eai, e);
}
return 0;