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authorNeale Ranns <nranns@cisco.com>2019-09-30 10:53:31 +0000
committerOle Trøan <otroan@employees.org>2019-12-17 10:56:20 +0000
commitcbe25aab3be72154f2c706c39eeba6a77f34450f (patch)
tree131fb53b5ec973be045ffb9e2eb797af01d112a0 /src/vnet/ip-neighbor/ip_neighbor.c
parent96453fd2417ebd1d69354a7fb692976129cea80e (diff)
ip: Protocol Independent IP Neighbors
Type: feature - ip-neighbour: generic neighbour handling; APIs, DBs, event handling, aging - arp: ARP protocol implementation - ip6-nd; IPv6 neighbor discovery implementation; separate ND, MLD, RA - ip6-link; manage link-local addresses - l2-arp-term; events separated from IP neighbours, since they are not the same. vnet retains just enough education to perform ND/ARP packet construction. arp and ip6-nd to be moved to plugins soon. Change-Id: I88dedd0006b299344f4c7024a0aa5baa6b9a8bbe Signed-off-by: Neale Ranns <nranns@cisco.com>
Diffstat (limited to 'src/vnet/ip-neighbor/ip_neighbor.c')
-rw-r--r--src/vnet/ip-neighbor/ip_neighbor.c1664
1 files changed, 1664 insertions, 0 deletions
diff --git a/src/vnet/ip-neighbor/ip_neighbor.c b/src/vnet/ip-neighbor/ip_neighbor.c
new file mode 100644
index 00000000000..11684eb9de5
--- /dev/null
+++ b/src/vnet/ip-neighbor/ip_neighbor.c
@@ -0,0 +1,1664 @@
+/*
+ * src/vnet/ip/ip_neighboor.c: ip neighbor generic handling
+ *
+ * Copyright (c) 2018 Cisco and/or its affiliates.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <vppinfra/llist.h>
+
+#include <vnet/ip-neighbor/ip_neighbor.h>
+#include <vnet/ip-neighbor/ip4_neighbor.h>
+#include <vnet/ip-neighbor/ip6_neighbor.h>
+#include <vnet/ip-neighbor/ip_neighbor_watch.h>
+
+#include <vnet/ip/ip6_ll_table.h>
+#include <vnet/fib/fib_table.h>
+#include <vnet/adj/adj_mcast.h>
+
+/** Pool for All IP neighbors */
+static ip_neighbor_t *ip_neighbor_pool;
+
+/** protocol specific lists of time sorted neighbors */
+index_t ip_neighbor_list_head[IP46_N_TYPES];
+
+typedef struct ip_neighbor_elt_t_
+{
+ clib_llist_anchor_t ipne_anchor;
+ index_t ipne_index;
+} ip_neighbor_elt_t;
+
+/** Pool of linked list elemeents */
+ip_neighbor_elt_t *ip_neighbor_elt_pool;
+
+typedef struct ip_neighbor_db_t_
+{
+ /** per interface hash */
+ uword **ipndb_hash;
+ /** per-protocol limit - max number of neighbors*/
+ u32 ipndb_limit;
+ /** max age of a neighbor before it's forcibly evicted */
+ u32 ipndb_age;
+ /** when the limit is reached and new neighbors are created, should
+ * we recycle an old one */
+ bool ipndb_recycle;
+ /** per-protocol number of elements */
+ u32 ipndb_n_elts;
+ /** per-protocol number of elements per-fib-index*/
+ u32 *ipndb_n_elts_per_fib;
+} ip_neighbor_db_t;
+
+static vlib_log_class_t ipn_logger;
+
+/* DBs of neighbours one per AF */
+/* *INDENT-OFF* */
+static ip_neighbor_db_t ip_neighbor_db[IP46_N_TYPES] = {
+ [IP46_TYPE_IP4] = {
+ .ipndb_limit = 50000,
+ /* Default to not aging and not recycling */
+ .ipndb_age = 0,
+ .ipndb_recycle = false,
+ },
+ [IP46_TYPE_IP6] = {
+ .ipndb_limit = 50000,
+ /* Default to not aging and not recycling */
+ .ipndb_age = 0,
+ .ipndb_recycle = false,
+ }
+};
+/* *INDENT-ON* */
+
+#define IP_NEIGHBOR_DBG(...) \
+ vlib_log_debug (ipn_logger, __VA_ARGS__);
+
+#define IP_NEIGHBOR_INFO(...) \
+ vlib_log_notice (ipn_logger, __VA_ARGS__);
+
+ip_neighbor_t *
+ip_neighbor_get (index_t ipni)
+{
+ if (pool_is_free_index (ip_neighbor_pool, ipni))
+ return (NULL);
+
+ return (pool_elt_at_index (ip_neighbor_pool, ipni));
+}
+
+static index_t
+ip_neighbor_get_index (const ip_neighbor_t * ipn)
+{
+ return (ipn - ip_neighbor_pool);
+}
+
+static bool
+ip_neighbor_is_dynamic (const ip_neighbor_t * ipn)
+{
+ return (ipn->ipn_flags & IP_NEIGHBOR_FLAG_DYNAMIC);
+}
+
+const ip46_address_t *
+ip_neighbor_get_ip (const ip_neighbor_t * ipn)
+{
+ return (&ipn->ipn_key->ipnk_ip);
+}
+
+const mac_address_t *
+ip_neighbor_get_mac (const ip_neighbor_t * ipn)
+{
+ return (&ipn->ipn_mac);
+}
+
+const u32
+ip_neighbor_get_sw_if_index (const ip_neighbor_t * ipn)
+{
+ return (ipn->ipn_key->ipnk_sw_if_index);
+}
+
+static void
+ip_neighbor_list_remove (ip_neighbor_t * ipn)
+{
+ /* new neighbours, are added to the head of the list, since the
+ * list is time sorted, newest first */
+ ip_neighbor_elt_t *elt;
+
+ if (~0 != ipn->ipn_elt)
+ {
+ elt = pool_elt_at_index (ip_neighbor_elt_pool, ipn->ipn_elt);
+
+ clib_llist_remove (ip_neighbor_elt_pool, ipne_anchor, elt);
+ }
+}
+
+static void
+ip_neighbor_refresh (ip_neighbor_t * ipn)
+{
+ /* new neighbours, are added to the head of the list, since the
+ * list is time sorted, newest first */
+ ip_neighbor_elt_t *elt, *head;
+
+ ipn->ipn_time_last_updated = vlib_time_now (vlib_get_main ());
+ ipn->ipn_n_probes = 0;
+
+ if (ip_neighbor_is_dynamic (ipn))
+ {
+ if (~0 == ipn->ipn_elt)
+ /* first time insertion */
+ pool_get_zero (ip_neighbor_elt_pool, elt);
+ else
+ {
+ /* already inserted - extract first */
+ elt = pool_elt_at_index (ip_neighbor_elt_pool, ipn->ipn_elt);
+
+ clib_llist_remove (ip_neighbor_elt_pool, ipne_anchor, elt);
+ }
+ head = pool_elt_at_index (ip_neighbor_elt_pool,
+ ip_neighbor_list_head[ipn->
+ ipn_key->ipnk_type]);
+
+ elt->ipne_index = ip_neighbor_get_index (ipn);
+ clib_llist_add (ip_neighbor_elt_pool, ipne_anchor, elt, head);
+ ipn->ipn_elt = elt - ip_neighbor_elt_pool;
+ }
+}
+
+static void
+ip_neighbor_db_add (const ip_neighbor_t * ipn)
+{
+ vec_validate (ip_neighbor_db[ipn->ipn_key->ipnk_type].ipndb_hash,
+ ipn->ipn_key->ipnk_sw_if_index);
+
+ if (!ip_neighbor_db[ipn->ipn_key->ipnk_type].ipndb_hash
+ [ipn->ipn_key->ipnk_sw_if_index])
+ ip_neighbor_db[ipn->ipn_key->ipnk_type].ipndb_hash[ipn->
+ ipn_key->ipnk_sw_if_index]
+ = hash_create_mem (0, sizeof (ip_neighbor_key_t), sizeof (index_t));
+
+ hash_set_mem (ip_neighbor_db[ipn->ipn_key->ipnk_type].ipndb_hash
+ [ipn->ipn_key->ipnk_sw_if_index], ipn->ipn_key,
+ ip_neighbor_get_index (ipn));
+
+ ip_neighbor_db[ipn->ipn_key->ipnk_type].ipndb_n_elts++;
+}
+
+static void
+ip_neighbor_db_remove (const ip_neighbor_key_t * key)
+{
+ vec_validate (ip_neighbor_db[key->ipnk_type].ipndb_hash,
+ key->ipnk_sw_if_index);
+
+ hash_unset_mem (ip_neighbor_db[key->ipnk_type].ipndb_hash
+ [key->ipnk_sw_if_index], key);
+
+ ip_neighbor_db[key->ipnk_type].ipndb_n_elts--;
+}
+
+static ip_neighbor_t *
+ip_neighbor_db_find (const ip_neighbor_key_t * key)
+{
+ uword *p;
+
+ if (key->ipnk_sw_if_index >=
+ vec_len (ip_neighbor_db[key->ipnk_type].ipndb_hash))
+ return NULL;
+
+ p =
+ hash_get_mem (ip_neighbor_db[key->ipnk_type].ipndb_hash
+ [key->ipnk_sw_if_index], key);
+
+ if (p)
+ return ip_neighbor_get (p[0]);
+
+ return (NULL);
+}
+
+static u8
+ip46_type_pfx_len (ip46_type_t type)
+{
+ return (type == IP46_TYPE_IP4 ? 32 : 128);
+}
+
+static void
+ip_neighbor_adj_fib_add (ip_neighbor_t * ipn, u32 fib_index)
+{
+ if (ipn->ipn_key->ipnk_type == IP46_TYPE_IP6 &&
+ ip6_address_is_link_local_unicast (&ipn->ipn_key->ipnk_ip.ip6))
+ {
+ ip6_ll_prefix_t pfx = {
+ .ilp_addr = ipn->ipn_key->ipnk_ip.ip6,
+ .ilp_sw_if_index = ipn->ipn_key->ipnk_sw_if_index,
+ };
+ ipn->ipn_fib_entry_index =
+ ip6_ll_table_entry_update (&pfx, FIB_ROUTE_PATH_FLAG_NONE);
+ }
+ else
+ {
+ fib_protocol_t fproto;
+
+ fproto = fib_proto_from_ip46 (ipn->ipn_key->ipnk_type);
+
+ fib_prefix_t pfx = {
+ .fp_len = ip46_type_pfx_len (ipn->ipn_key->ipnk_type),
+ .fp_proto = fproto,
+ .fp_addr = ipn->ipn_key->ipnk_ip,
+ };
+
+ ipn->ipn_fib_entry_index =
+ fib_table_entry_path_add (fib_index, &pfx, FIB_SOURCE_ADJ,
+ FIB_ENTRY_FLAG_ATTACHED,
+ fib_proto_to_dpo (fproto),
+ &pfx.fp_addr,
+ ipn->ipn_key->ipnk_sw_if_index,
+ ~0, 1, NULL, FIB_ROUTE_PATH_FLAG_NONE);
+
+ vec_validate (ip_neighbor_db
+ [ipn->ipn_key->ipnk_type].ipndb_n_elts_per_fib,
+ fib_index);
+
+ ip_neighbor_db[ipn->ipn_key->
+ ipnk_type].ipndb_n_elts_per_fib[fib_index]++;
+
+ if (1 ==
+ ip_neighbor_db[ipn->ipn_key->
+ ipnk_type].ipndb_n_elts_per_fib[fib_index])
+ fib_table_lock (fib_index, fproto, FIB_SOURCE_ADJ);
+ }
+}
+
+static void
+ip_neighbor_adj_fib_remove (ip_neighbor_t * ipn, u32 fib_index)
+{
+ if (FIB_NODE_INDEX_INVALID != ipn->ipn_fib_entry_index)
+ {
+ if (ipn->ipn_key->ipnk_type == IP46_TYPE_IP6 &&
+ ip6_address_is_link_local_unicast (&ipn->ipn_key->ipnk_ip.ip6))
+ {
+ ip6_ll_prefix_t pfx = {
+ .ilp_addr = ipn->ipn_key->ipnk_ip.ip6,
+ .ilp_sw_if_index = ipn->ipn_key->ipnk_sw_if_index,
+ };
+ ip6_ll_table_entry_delete (&pfx);
+ }
+ else
+ {
+ fib_protocol_t fproto;
+
+ fproto = fib_proto_from_ip46 (ipn->ipn_key->ipnk_type);
+
+ fib_prefix_t pfx = {
+ .fp_len = ip46_type_pfx_len (ipn->ipn_key->ipnk_type),
+ .fp_proto = fproto,
+ .fp_addr = ipn->ipn_key->ipnk_ip,
+ };
+
+ fib_table_entry_path_remove (fib_index,
+ &pfx,
+ FIB_SOURCE_ADJ,
+ fib_proto_to_dpo (fproto),
+ &pfx.fp_addr,
+ ipn->ipn_key->ipnk_sw_if_index,
+ ~0, 1, FIB_ROUTE_PATH_FLAG_NONE);
+
+ ip_neighbor_db[ipn->ipn_key->
+ ipnk_type].ipndb_n_elts_per_fib[fib_index]--;
+
+ if (0 ==
+ ip_neighbor_db[ipn->ipn_key->
+ ipnk_type].ipndb_n_elts_per_fib[fib_index])
+ fib_table_unlock (fib_index, fproto, FIB_SOURCE_ADJ);
+ }
+ }
+}
+
+static void
+ip_neighbor_mk_complete (adj_index_t ai, ip_neighbor_t * ipn)
+{
+ adj_nbr_update_rewrite (ai, ADJ_NBR_REWRITE_FLAG_COMPLETE,
+ ethernet_build_rewrite (vnet_get_main (),
+ ipn->
+ ipn_key->ipnk_sw_if_index,
+ adj_get_link_type (ai),
+ ipn->ipn_mac.bytes));
+}
+
+static void
+ip_neighbor_mk_incomplete (adj_index_t ai)
+{
+ ip_adjacency_t *adj = adj_get (ai);
+
+ adj_nbr_update_rewrite (ai,
+ ADJ_NBR_REWRITE_FLAG_INCOMPLETE,
+ ethernet_build_rewrite (vnet_get_main (),
+ adj->
+ rewrite_header.sw_if_index,
+ adj_get_link_type (ai),
+ VNET_REWRITE_FOR_SW_INTERFACE_ADDRESS_BROADCAST));
+}
+
+static adj_walk_rc_t
+ip_neighbor_mk_complete_walk (adj_index_t ai, void *ctx)
+{
+ ip_neighbor_t *ipn = ctx;
+
+ ip_neighbor_mk_complete (ai, ipn);
+
+ return (ADJ_WALK_RC_CONTINUE);
+}
+
+static adj_walk_rc_t
+ip_neighbor_mk_incomplete_walk (adj_index_t ai, void *ctx)
+{
+ ip_neighbor_mk_incomplete (ai);
+
+ return (ADJ_WALK_RC_CONTINUE);
+}
+
+static void
+ip_neighbor_free (ip_neighbor_t * ipn)
+{
+ IP_NEIGHBOR_DBG ("free: %U", format_ip_neighbor,
+ ip_neighbor_get_index (ipn));
+
+ adj_nbr_walk_nh (ipn->ipn_key->ipnk_sw_if_index,
+ fib_proto_from_ip46 (ipn->ipn_key->ipnk_type),
+ &ipn->ipn_key->ipnk_ip,
+ ip_neighbor_mk_incomplete_walk, ipn);
+ ip_neighbor_adj_fib_remove
+ (ipn,
+ fib_table_get_index_for_sw_if_index
+ (fib_proto_from_ip46 (ipn->ipn_key->ipnk_type),
+ ipn->ipn_key->ipnk_sw_if_index));
+
+ ip_neighbor_list_remove (ipn);
+ ip_neighbor_db_remove (ipn->ipn_key);
+ clib_mem_free (ipn->ipn_key);
+
+ pool_put (ip_neighbor_pool, ipn);
+}
+
+static bool
+ip_neighbor_force_reuse (ip46_type_t type)
+{
+ if (!ip_neighbor_db[type].ipndb_recycle)
+ return false;
+
+ /* pluck the oldest entry, which is the one from the end of the list */
+ ip_neighbor_elt_t *elt, *head;
+
+ head =
+ pool_elt_at_index (ip_neighbor_elt_pool, ip_neighbor_list_head[type]);
+
+ if (clib_llist_is_empty (ip_neighbor_elt_pool, ipne_anchor, head))
+ return (false);
+
+ elt = clib_llist_prev (ip_neighbor_elt_pool, ipne_anchor, head);
+ ip_neighbor_free (ip_neighbor_get (elt->ipne_index));
+
+ return (true);
+}
+
+static ip_neighbor_t *
+ip_neighbor_alloc (const ip_neighbor_key_t * key,
+ const mac_address_t * mac, ip_neighbor_flags_t flags)
+{
+ ip_neighbor_t *ipn;
+
+ if (ip_neighbor_db[key->ipnk_type].ipndb_limit &&
+ (ip_neighbor_db[key->ipnk_type].ipndb_n_elts >=
+ ip_neighbor_db[key->ipnk_type].ipndb_limit))
+ {
+ if (!ip_neighbor_force_reuse (key->ipnk_type))
+ return (NULL);
+ }
+
+ pool_get_zero (ip_neighbor_pool, ipn);
+
+ ipn->ipn_key = clib_mem_alloc (sizeof (*ipn->ipn_key));
+ clib_memcpy (ipn->ipn_key, key, sizeof (*ipn->ipn_key));
+
+ ipn->ipn_fib_entry_index = FIB_NODE_INDEX_INVALID;
+ ipn->ipn_flags = flags;
+ ipn->ipn_elt = ~0;
+
+ mac_address_copy (&ipn->ipn_mac, mac);
+
+ ip_neighbor_db_add (ipn);
+
+ /* create the adj-fib. the entry in the FIB table for the peer's interface */
+ if (!(ipn->ipn_flags & IP_NEIGHBOR_FLAG_NO_FIB_ENTRY))
+ ip_neighbor_adj_fib_add
+ (ipn, fib_table_get_index_for_sw_if_index
+ (fib_proto_from_ip46 (ipn->ipn_key->ipnk_type),
+ ipn->ipn_key->ipnk_sw_if_index));
+
+ return (ipn);
+}
+
+int
+ip_neighbor_add (const ip46_address_t * ip,
+ ip46_type_t type,
+ const mac_address_t * mac,
+ u32 sw_if_index,
+ ip_neighbor_flags_t flags, u32 * stats_index)
+{
+ fib_protocol_t fproto;
+ ip_neighbor_t *ipn;
+
+ /* main thread only */
+ ASSERT (0 == vlib_get_thread_index ());
+
+ fproto = fib_proto_from_ip46 (type);
+
+ const ip_neighbor_key_t key = {
+ .ipnk_ip = *ip,
+ .ipnk_sw_if_index = sw_if_index,
+ .ipnk_type = type,
+ };
+
+ ipn = ip_neighbor_db_find (&key);
+
+ if (ipn)
+ {
+ IP_NEIGHBOR_DBG ("update: %U, %U",
+ format_vnet_sw_if_index_name, vnet_get_main (),
+ sw_if_index, format_ip46_address, ip, type,
+ format_ip_neighbor_flags, flags, format_mac_address_t,
+ mac);
+
+ /* Refuse to over-write static neighbor entry. */
+ if (!(flags & IP_NEIGHBOR_FLAG_STATIC) &&
+ (ipn->ipn_flags & IP_NEIGHBOR_FLAG_STATIC))
+ {
+ /* if MAC address match, still check to send event */
+ if (0 == mac_address_cmp (&ipn->ipn_mac, mac))
+ goto check_customers;
+ return -2;
+ }
+
+ /*
+ * prevent a DoS attack from the data-plane that
+ * spams us with no-op updates to the MAC address
+ */
+ if (0 == mac_address_cmp (&ipn->ipn_mac, mac))
+ {
+ ip_neighbor_refresh (ipn);
+ goto check_customers;
+ }
+
+ mac_address_copy (&ipn->ipn_mac, mac);
+
+ /* A dynamic entry can become static, but not vice-versa.
+ * i.e. since if it was programmed by the CP then it must
+ * be removed by the CP */
+ if ((flags & IP_NEIGHBOR_FLAG_STATIC) &&
+ !(ipn->ipn_flags & IP_NEIGHBOR_FLAG_STATIC))
+ {
+ ip_neighbor_list_remove (ipn);
+ ipn->ipn_flags |= IP_NEIGHBOR_FLAG_STATIC;
+ ipn->ipn_flags &= ~IP_NEIGHBOR_FLAG_DYNAMIC;
+ }
+ }
+ else
+ {
+ IP_NEIGHBOR_INFO ("add: %U, %U",
+ format_vnet_sw_if_index_name, vnet_get_main (),
+ sw_if_index, format_ip46_address, ip, type,
+ format_ip_neighbor_flags, flags, format_mac_address_t,
+ mac);
+
+ ipn = ip_neighbor_alloc (&key, mac, flags);
+
+ if (NULL == ipn)
+ return VNET_API_ERROR_LIMIT_EXCEEDED;
+ }
+
+ /* Update time stamp and flags. */
+ ip_neighbor_refresh (ipn);
+
+ adj_nbr_walk_nh (ipn->ipn_key->ipnk_sw_if_index,
+ fproto, &ipn->ipn_key->ipnk_ip,
+ ip_neighbor_mk_complete_walk, ipn);
+
+check_customers:
+ /* Customer(s) requesting event for this address? */
+ ip_neighbor_publish (ip_neighbor_get_index (ipn));
+
+ if (stats_index)
+ *stats_index = adj_nbr_find (fproto,
+ fib_proto_to_link (fproto),
+ &ipn->ipn_key->ipnk_ip,
+ ipn->ipn_key->ipnk_sw_if_index);
+ return 0;
+}
+
+int
+ip_neighbor_del (const ip46_address_t * ip, ip46_type_t type, u32 sw_if_index)
+{
+ ip_neighbor_t *ipn;
+
+ /* main thread only */
+ ASSERT (0 == vlib_get_thread_index ());
+
+ IP_NEIGHBOR_INFO ("delete: %U, %U",
+ format_vnet_sw_if_index_name, vnet_get_main (),
+ sw_if_index, format_ip46_address, ip, type);
+
+ const ip_neighbor_key_t key = {
+ .ipnk_ip = *ip,
+ .ipnk_sw_if_index = sw_if_index,
+ .ipnk_type = type,
+ };
+
+ ipn = ip_neighbor_db_find (&key);
+
+ if (NULL == ipn)
+ return (VNET_API_ERROR_NO_SUCH_ENTRY);
+
+ ip_neighbor_free (ipn);
+
+ return (0);
+}
+
+void
+ip_neighbor_update (vnet_main_t * vnm, adj_index_t ai)
+{
+ ip_neighbor_t *ipn;
+ ip_adjacency_t *adj;
+
+ adj = adj_get (ai);
+
+ ip_neighbor_key_t key = {
+ .ipnk_ip = adj->sub_type.nbr.next_hop,
+ .ipnk_type = fib_proto_to_ip46 (adj->ia_nh_proto),
+ .ipnk_sw_if_index = adj->rewrite_header.sw_if_index,
+ };
+ ipn = ip_neighbor_db_find (&key);
+
+ switch (adj->lookup_next_index)
+ {
+ case IP_LOOKUP_NEXT_ARP:
+ if (NULL != ipn)
+ {
+ adj_nbr_walk_nh (adj->rewrite_header.sw_if_index,
+ adj->ia_nh_proto,
+ &ipn->ipn_key->ipnk_ip,
+ ip_neighbor_mk_complete_walk, ipn);
+ }
+ else
+ {
+ /*
+ * no matching ARP entry.
+ * construct the rewrite required to for an ARP packet, and stick
+ * that in the adj's pipe to smoke.
+ */
+ adj_nbr_update_rewrite
+ (ai,
+ ADJ_NBR_REWRITE_FLAG_INCOMPLETE,
+ ethernet_build_rewrite
+ (vnm,
+ adj->rewrite_header.sw_if_index,
+ VNET_LINK_ARP,
+ VNET_REWRITE_FOR_SW_INTERFACE_ADDRESS_BROADCAST));
+
+ /*
+ * since the FIB has added this adj for a route, it makes sense it
+ * may want to forward traffic sometime soon. Let's send a
+ * speculative ARP. just one. If we were to do periodically that
+ * wouldn't be bad either, but that's more code than i'm prepared to
+ * write at this time for relatively little reward.
+ */
+ ip_neighbor_probe (adj);
+ }
+ break;
+ case IP_LOOKUP_NEXT_GLEAN:
+ case IP_LOOKUP_NEXT_BCAST:
+ case IP_LOOKUP_NEXT_MCAST:
+ case IP_LOOKUP_NEXT_DROP:
+ case IP_LOOKUP_NEXT_PUNT:
+ case IP_LOOKUP_NEXT_LOCAL:
+ case IP_LOOKUP_NEXT_REWRITE:
+ case IP_LOOKUP_NEXT_MCAST_MIDCHAIN:
+ case IP_LOOKUP_NEXT_MIDCHAIN:
+ case IP_LOOKUP_NEXT_ICMP_ERROR:
+ case IP_LOOKUP_N_NEXT:
+ ASSERT (0);
+ break;
+ }
+}
+
+void
+ip_neighbor_learn (const ip_neighbor_learn_t * l)
+{
+ ip_neighbor_add (&l->ip, l->type, &l->mac, l->sw_if_index,
+ IP_NEIGHBOR_FLAG_DYNAMIC, NULL);
+}
+
+static clib_error_t *
+ip_neighbor_cmd (vlib_main_t * vm,
+ unformat_input_t * input, vlib_cli_command_t * cmd)
+{
+ ip46_address_t ip = ip46_address_initializer;
+ mac_address_t mac = ZERO_MAC_ADDRESS;
+ vnet_main_t *vnm = vnet_get_main ();
+ ip_neighbor_flags_t flags;
+ u32 sw_if_index = ~0;
+ int is_add = 1;
+ int count = 1;
+
+ flags = IP_NEIGHBOR_FLAG_DYNAMIC;
+
+ while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
+ {
+ /* set ip arp TenGigE1/1/0/1 1.2.3.4 aa:bb:... or aabb.ccdd... */
+ if (unformat (input, "%U %U %U",
+ unformat_vnet_sw_interface, vnm, &sw_if_index,
+ unformat_ip46_address, &ip, IP46_TYPE_ANY,
+ unformat_mac_address_t, &mac))
+ ;
+ else if (unformat (input, "delete") || unformat (input, "del"))
+ is_add = 0;
+ else if (unformat (input, "static"))
+ {
+ flags |= IP_NEIGHBOR_FLAG_STATIC;
+ flags &= ~IP_NEIGHBOR_FLAG_DYNAMIC;
+ }
+ else if (unformat (input, "no-fib-entry"))
+ flags |= IP_NEIGHBOR_FLAG_NO_FIB_ENTRY;
+ else if (unformat (input, "count %d", &count))
+ ;
+ else
+ break;
+ }
+
+ if (sw_if_index == ~0 ||
+ ip46_address_is_zero (&ip) || mac_address_is_zero (&mac))
+ return clib_error_return (0,
+ "specify interface, IP address and MAC: `%U'",
+ format_unformat_error, input);
+
+ while (count)
+ {
+ if (is_add)
+ ip_neighbor_add (&ip, ip46_address_get_type (&ip), &mac, sw_if_index,
+ flags, NULL);
+ else
+ ip_neighbor_del (&ip, ip46_address_get_type (&ip), sw_if_index);
+
+ ip46_address_increment (ip46_address_get_type (&ip), &ip);
+ mac_address_increment (&mac);
+
+ --count;
+ }
+
+ return NULL;
+}
+
+/* *INDENT-OFF* */
+/*?
+ * Add or delete IPv4 ARP cache entries.
+ *
+ * @note 'set ip neighbor' options (e.g. delete, static, 'fib-id <id>',
+ * 'count <number>', 'interface ip4_addr mac_addr') can be added in
+ * any order and combination.
+ *
+ * @cliexpar
+ * @parblock
+ * Add or delete IPv4 ARP cache entries as follows. MAC Address can be in
+ * either aa:bb:cc:dd:ee:ff format or aabb.ccdd.eeff format.
+ * @cliexcmd{set ip neighbor GigabitEthernet2/0/0 6.0.0.3 dead.beef.babe}
+ * @cliexcmd{set ip neighbor delete GigabitEthernet2/0/0 6.0.0.3 de:ad:be:ef:ba:be}
+ *
+ * To add or delete an IPv4 ARP cache entry to or from a specific fib
+ * table:
+ * @cliexcmd{set ip neighbor fib-id 1 GigabitEthernet2/0/0 6.0.0.3 dead.beef.babe}
+ * @cliexcmd{set ip neighbor fib-id 1 delete GigabitEthernet2/0/0 6.0.0.3 dead.beef.babe}
+ *
+ * Add or delete IPv4 static ARP cache entries as follows:
+ * @cliexcmd{set ip neighbor static GigabitEthernet2/0/0 6.0.0.3 dead.beef.babe}
+ * @cliexcmd{set ip neighbor static delete GigabitEthernet2/0/0 6.0.0.3 dead.beef.babe}
+ *
+ * For testing / debugging purposes, the 'set ip neighbor' command can add or
+ * delete multiple entries. Supply the 'count N' parameter:
+ * @cliexcmd{set ip neighbor count 10 GigabitEthernet2/0/0 6.0.0.3 dead.beef.babe}
+ * @endparblock
+ ?*/
+VLIB_CLI_COMMAND (ip_neighbor_command, static) = {
+ .path = "set ip neighbor",
+ .short_help =
+ "set ip neighbor [del] <intfc> <ip-address> <mac-address> [static] [no-fib-entry] [count <count>] [fib-id <fib-id>] [proxy <lo-addr> - <hi-addr>]",
+ .function = ip_neighbor_cmd,
+};
+VLIB_CLI_COMMAND (ip_neighbor_command2, static) = {
+ .path = "ip neighbor",
+ .short_help =
+ "ip neighbor [del] <intfc> <ip-address> <mac-address> [static] [no-fib-entry] [count <count>] [fib-id <fib-id>] [proxy <lo-addr> - <hi-addr>]",
+ .function = ip_neighbor_cmd,
+};
+/* *INDENT-ON* */
+
+static int
+ip_neighbor_sort (void *a1, void *a2)
+{
+ index_t *ipni1 = a1, *ipni2 = a2;
+ ip_neighbor_t *ipn1, *ipn2;
+ int cmp;
+
+ ipn1 = ip_neighbor_get (*ipni1);
+ ipn2 = ip_neighbor_get (*ipni2);
+
+ cmp = vnet_sw_interface_compare (vnet_get_main (),
+ ipn1->ipn_key->ipnk_sw_if_index,
+ ipn2->ipn_key->ipnk_sw_if_index);
+ if (!cmp)
+ cmp = ip46_address_cmp (&ipn1->ipn_key->ipnk_ip, &ipn2->ipn_key->ipnk_ip);
+ return cmp;
+}
+
+static index_t *
+ip_neighbor_entries (u32 sw_if_index, ip46_type_t type)
+{
+ index_t *ipnis = NULL;
+ ip_neighbor_t *ipn;
+
+ /* *INDENT-OFF* */
+ pool_foreach (ipn, ip_neighbor_pool,
+ ({
+ if (sw_if_index != ~0 &&
+ ipn->ipn_key->ipnk_sw_if_index != sw_if_index &&
+ (IP46_TYPE_ANY == type ||
+ (ipn->ipn_key->ipnk_type == type)))
+ continue;
+ vec_add1 (ipnis, ip_neighbor_get_index(ipn));
+ }));
+
+ /* *INDENT-ON* */
+
+ if (ipnis)
+ vec_sort_with_function (ipnis, ip_neighbor_sort);
+ return ipnis;
+}
+
+static clib_error_t *
+ip_neighbor_show_sorted_i (vlib_main_t * vm,
+ unformat_input_t * input,
+ vlib_cli_command_t * cmd, ip46_type_t type)
+{
+ ip_neighbor_elt_t *elt, *head;
+
+ head = pool_elt_at_index (ip_neighbor_elt_pool,
+ ip_neighbor_list_head[type]);
+
+
+ vlib_cli_output (vm, "%=12s%=40s%=6s%=20s%=24s", "Time", "IP",
+ "Flags", "Ethernet", "Interface");
+
+ /* *INDENT-OFF*/
+ /* the list is time sorted, newest first, so start from the back
+ * and work forwards. Stop when we get to one that is alive */
+ clib_llist_foreach_reverse(ip_neighbor_elt_pool,
+ ipne_anchor, head, elt,
+ ({
+ vlib_cli_output (vm, "%U", format_ip_neighbor, elt->ipne_index);
+ }));
+ /* *INDENT-ON*/
+
+ return (NULL);
+}
+
+static clib_error_t *
+ip_neighbor_show_i (vlib_main_t * vm,
+ unformat_input_t * input,
+ vlib_cli_command_t * cmd, ip46_type_t type)
+{
+ index_t *ipni, *ipnis = NULL;
+ u32 sw_if_index;
+
+ /* Filter entries by interface if given. */
+ sw_if_index = ~0;
+ (void) unformat_user (input, unformat_vnet_sw_interface, vnet_get_main (),
+ &sw_if_index);
+
+ ipnis = ip_neighbor_entries (sw_if_index, type);
+
+ if (ipnis)
+ vlib_cli_output (vm, "%=12s%=40s%=6s%=20s%=24s", "Time", "IP",
+ "Flags", "Ethernet", "Interface");
+
+ vec_foreach (ipni, ipnis)
+ {
+ vlib_cli_output (vm, "%U", format_ip_neighbor, *ipni);
+ }
+ vec_free (ipnis);
+
+ return (NULL);
+}
+
+static clib_error_t *
+ip_neighbor_show (vlib_main_t * vm,
+ unformat_input_t * input, vlib_cli_command_t * cmd)
+{
+ return (ip_neighbor_show_i (vm, input, cmd, IP46_TYPE_ANY));
+}
+
+static clib_error_t *
+ip6_neighbor_show (vlib_main_t * vm,
+ unformat_input_t * input, vlib_cli_command_t * cmd)
+{
+ return (ip_neighbor_show_i (vm, input, cmd, IP46_TYPE_IP6));
+}
+
+static clib_error_t *
+ip4_neighbor_show (vlib_main_t * vm,
+ unformat_input_t * input, vlib_cli_command_t * cmd)
+{
+ return (ip_neighbor_show_i (vm, input, cmd, IP46_TYPE_IP4));
+}
+
+static clib_error_t *
+ip6_neighbor_show_sorted (vlib_main_t * vm,
+ unformat_input_t * input, vlib_cli_command_t * cmd)
+{
+ return (ip_neighbor_show_sorted_i (vm, input, cmd, IP46_TYPE_IP6));
+}
+
+static clib_error_t *
+ip4_neighbor_show_sorted (vlib_main_t * vm,
+ unformat_input_t * input, vlib_cli_command_t * cmd)
+{
+ return (ip_neighbor_show_sorted_i (vm, input, cmd, IP46_TYPE_IP4));
+}
+
+/*?
+ * Display all the IP neighbor entries.
+ *
+ * @cliexpar
+ * Example of how to display the IPv4 ARP table:
+ * @cliexstart{show ip neighbor}
+ * Time FIB IP4 Flags Ethernet Interface
+ * 346.3028 0 6.1.1.3 de:ad:be:ef:ba:be GigabitEthernet2/0/0
+ * 3077.4271 0 6.1.1.4 S de:ad:be:ef:ff:ff GigabitEthernet2/0/0
+ * 2998.6409 1 6.2.2.3 de:ad:be:ef:00:01 GigabitEthernet2/0/0
+ * Proxy arps enabled for:
+ * Fib_index 0 6.0.0.1 - 6.0.0.11
+ * @cliexend
+ ?*/
+/* *INDENT-OFF* */
+VLIB_CLI_COMMAND (show_ip_neighbors_cmd_node, static) = {
+ .path = "show ip neighbors",
+ .function = ip_neighbor_show,
+ .short_help = "show ip neighbors [interface]",
+};
+VLIB_CLI_COMMAND (show_ip4_neighbors_cmd_node, static) = {
+ .path = "show ip4 neighbors",
+ .function = ip4_neighbor_show,
+ .short_help = "show ip4 neighbors [interface]",
+};
+VLIB_CLI_COMMAND (show_ip6_neighbors_cmd_node, static) = {
+ .path = "show ip6 neighbors",
+ .function = ip6_neighbor_show,
+ .short_help = "show ip6 neighbors [interface]",
+};
+VLIB_CLI_COMMAND (show_ip_neighbor_cmd_node, static) = {
+ .path = "show ip neighbor",
+ .function = ip_neighbor_show,
+ .short_help = "show ip neighbor [interface]",
+};
+VLIB_CLI_COMMAND (show_ip4_neighbor_cmd_node, static) = {
+ .path = "show ip4 neighbor",
+ .function = ip4_neighbor_show,
+ .short_help = "show ip4 neighbor [interface]",
+};
+VLIB_CLI_COMMAND (show_ip6_neighbor_cmd_node, static) = {
+ .path = "show ip6 neighbor",
+ .function = ip6_neighbor_show,
+ .short_help = "show ip6 neighbor [interface]",
+};
+VLIB_CLI_COMMAND (show_ip4_neighbor_sorted_cmd_node, static) = {
+ .path = "show ip4 neighbor-sorted",
+ .function = ip4_neighbor_show_sorted,
+ .short_help = "show ip4 neighbor-sorted",
+};
+VLIB_CLI_COMMAND (show_ip6_neighbor_sorted_cmd_node, static) = {
+ .path = "show ip6 neighbor-sorted",
+ .function = ip6_neighbor_show_sorted,
+ .short_help = "show ip6 neighbor-sorted",
+};
+/* *INDENT-ON* */
+
+static ip_neighbor_vft_t ip_nbr_vfts[IP46_N_TYPES];
+
+void
+ip_neighbor_register (ip46_type_t type, const ip_neighbor_vft_t * vft)
+{
+ ip_nbr_vfts[type] = *vft;
+}
+
+void
+ip_neighbor_probe_dst (const ip_adjacency_t * adj, const ip46_address_t * dst)
+{
+ if (!vnet_sw_interface_is_admin_up (vnet_get_main (),
+ adj->rewrite_header.sw_if_index))
+ return;
+
+ switch (adj->ia_nh_proto)
+ {
+ case FIB_PROTOCOL_IP6:
+ ip6_neighbor_probe_dst (adj, &dst->ip6);
+ break;
+ case FIB_PROTOCOL_IP4:
+ ip4_neighbor_probe_dst (adj, &dst->ip4);
+ break;
+ case FIB_PROTOCOL_MPLS:
+ ASSERT (0);
+ break;
+ }
+}
+
+void
+ip_neighbor_probe (const ip_adjacency_t * adj)
+{
+ ip_neighbor_probe_dst (adj, &adj->sub_type.nbr.next_hop);
+}
+
+void
+ip_neighbor_advertise (vlib_main_t * vm,
+ ip46_type_t type,
+ const ip46_address_t * addr, u32 sw_if_index)
+{
+ vnet_main_t *vnm = vnet_get_main ();
+
+ if (type == IP46_TYPE_IP4 || type == IP46_TYPE_BOTH)
+ ip4_neighbor_advertise (vm, vnm, sw_if_index, &addr->ip4);
+ if (type == IP46_TYPE_IP6 || type == IP46_TYPE_BOTH)
+ ip6_neighbor_advertise (vm, vnm, sw_if_index, &addr->ip6);
+}
+
+void
+ip_neighbor_walk (ip46_type_t type,
+ u32 sw_if_index, ip_neighbor_walk_cb_t cb, void *ctx)
+{
+ ip_neighbor_key_t *key;
+ index_t ipni;
+
+ if (~0 == sw_if_index)
+ {
+ uword **hash;
+
+ vec_foreach (hash, ip_neighbor_db[type].ipndb_hash)
+ {
+ /* *INDENT-OFF* */
+ hash_foreach (key, ipni, *hash,
+ ({
+ cb (ipni, ctx);
+ }));
+ /* *INDENT-ON* */
+ }
+ }
+ else
+ {
+ uword *hash;
+
+ if (vec_len (ip_neighbor_db[type].ipndb_hash) <= sw_if_index)
+ return;
+ hash = ip_neighbor_db[type].ipndb_hash[sw_if_index];
+
+ /* *INDENT-OFF* */
+ hash_foreach (key, ipni, hash,
+ ({
+ cb (ipni, ctx);
+ }));
+ /* *INDENT-ON* */
+ }
+}
+
+int
+ip4_neighbor_proxy_add (u32 fib_index,
+ const ip4_address_t * start,
+ const ip4_address_t * end)
+{
+ if (ip_nbr_vfts[IP46_TYPE_IP4].inv_proxy4_add)
+ {
+ return (ip_nbr_vfts[IP46_TYPE_IP4].inv_proxy4_add
+ (fib_index, start, end));
+ }
+
+ return (-1);
+}
+
+int
+ip4_neighbor_proxy_delete (u32 fib_index,
+ const ip4_address_t * start,
+ const ip4_address_t * end)
+{
+ if (ip_nbr_vfts[IP46_TYPE_IP4].inv_proxy4_del)
+ {
+ return (ip_nbr_vfts[IP46_TYPE_IP4].inv_proxy4_del
+ (fib_index, start, end));
+ }
+ return -1;
+}
+
+int
+ip4_neighbor_proxy_enable (u32 sw_if_index)
+{
+ if (ip_nbr_vfts[IP46_TYPE_IP4].inv_proxy4_enable)
+ {
+ return (ip_nbr_vfts[IP46_TYPE_IP4].inv_proxy4_enable (sw_if_index));
+ }
+ return -1;
+}
+
+int
+ip4_neighbor_proxy_disable (u32 sw_if_index)
+{
+ if (ip_nbr_vfts[IP46_TYPE_IP4].inv_proxy4_disable)
+ {
+ return (ip_nbr_vfts[IP46_TYPE_IP4].inv_proxy4_disable (sw_if_index));
+ }
+ return -1;
+}
+
+int
+ip6_neighbor_proxy_add (u32 sw_if_index, const ip6_address_t * addr)
+{
+ if (ip_nbr_vfts[IP46_TYPE_IP6].inv_proxy6_add)
+ {
+ return (ip_nbr_vfts[IP46_TYPE_IP6].inv_proxy6_add (sw_if_index, addr));
+ }
+ return -1;
+}
+
+int
+ip6_neighbor_proxy_del (u32 sw_if_index, const ip6_address_t * addr)
+{
+ if (ip_nbr_vfts[IP46_TYPE_IP6].inv_proxy6_del)
+ {
+ return (ip_nbr_vfts[IP46_TYPE_IP6].inv_proxy6_del (sw_if_index, addr));
+ }
+ return -1;
+}
+
+static void
+ip_neighbor_ethernet_change_mac (ethernet_main_t * em,
+ u32 sw_if_index, uword opaque)
+{
+ ip_neighbor_t *ipn;
+ adj_index_t ai;
+
+ IP_NEIGHBOR_DBG ("mac-change: %U",
+ format_vnet_sw_if_index_name, vnet_get_main (),
+ sw_if_index);
+
+ /* *INDENT-OFF* */
+ pool_foreach (ipn, ip_neighbor_pool,
+ ({
+ if (ipn->ipn_key->ipnk_sw_if_index == sw_if_index)
+ adj_nbr_walk_nh (ipn->ipn_key->ipnk_sw_if_index,
+ fib_proto_from_ip46(ipn->ipn_key->ipnk_type),
+ &ipn->ipn_key->ipnk_ip,
+ ip_neighbor_mk_complete_walk,
+ ipn);
+ }));
+ /* *INDENT-ON* */
+
+ ai = adj_glean_get (FIB_PROTOCOL_IP4, sw_if_index);
+
+ if (ADJ_INDEX_INVALID != ai)
+ adj_glean_update_rewrite (ai);
+}
+
+void
+ip_neighbor_populate (ip46_type_t type, u32 sw_if_index)
+{
+ index_t *ipnis = NULL, *ipni;
+ ip_neighbor_t *ipn;
+
+ IP_NEIGHBOR_DBG ("populate: %U %U",
+ format_vnet_sw_if_index_name, vnet_get_main (),
+ sw_if_index, format_ip46_type, type);
+
+ /* *INDENT-OFF* */
+ pool_foreach (ipn, ip_neighbor_pool,
+ ({
+ if (ipn->ipn_key->ipnk_type == type &&
+ ipn->ipn_key->ipnk_sw_if_index == sw_if_index)
+ vec_add1 (ipnis, ipn - ip_neighbor_pool);
+ }));
+ /* *INDENT-ON* */
+
+ vec_foreach (ipni, ipnis)
+ {
+ ipn = ip_neighbor_get (*ipni);
+
+ adj_nbr_walk_nh (ipn->ipn_key->ipnk_sw_if_index,
+ fib_proto_from_ip46 (ipn->ipn_key->ipnk_type),
+ &ipn->ipn_key->ipnk_ip,
+ ip_neighbor_mk_complete_walk, ipn);
+ }
+ vec_free (ipnis);
+}
+
+void
+ip_neighbor_flush (ip46_type_t type, u32 sw_if_index)
+{
+ index_t *ipnis = NULL, *ipni;
+ ip_neighbor_t *ipn;
+
+ IP_NEIGHBOR_DBG ("flush: %U %U",
+ format_vnet_sw_if_index_name, vnet_get_main (),
+ sw_if_index, format_ip46_type, type);
+
+ /* *INDENT-OFF* */
+ pool_foreach (ipn, ip_neighbor_pool,
+ ({
+ if (ipn->ipn_key->ipnk_type == type &&
+ ipn->ipn_key->ipnk_sw_if_index == sw_if_index &&
+ ip_neighbor_is_dynamic (ipn))
+ vec_add1 (ipnis, ipn - ip_neighbor_pool);
+ }));
+ /* *INDENT-ON* */
+
+ vec_foreach (ipni, ipnis) ip_neighbor_free (ip_neighbor_get (*ipni));
+ vec_free (ipnis);
+}
+
+/*
+ * Remove any arp entries associated with the specified interface
+ */
+static clib_error_t *
+ip_neighbor_interface_admin_change (vnet_main_t * vnm,
+ u32 sw_if_index, u32 flags)
+{
+ ip46_type_t type;
+
+ IP_NEIGHBOR_DBG ("interface-admin: %U %s",
+ format_vnet_sw_if_index_name, vnet_get_main (),
+ sw_if_index,
+ (flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP ? "up" : "down"));
+
+ if (flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP)
+ {
+ FOREACH_IP46_TYPE (type) ip_neighbor_populate (type, sw_if_index);
+ }
+ else
+ {
+ /* admin down, flush all neighbours */
+ FOREACH_IP46_TYPE (type) ip_neighbor_flush (type, sw_if_index);
+ }
+
+ return (NULL);
+}
+
+VNET_SW_INTERFACE_ADMIN_UP_DOWN_FUNCTION (ip_neighbor_interface_admin_change);
+
+/*
+ * Remove any arp entries associated with the specified interface
+ */
+static clib_error_t *
+ip_neighbor_delete_sw_interface (vnet_main_t * vnm,
+ u32 sw_if_index, u32 is_add)
+{
+ IP_NEIGHBOR_DBG ("interface-change: %U %s",
+ format_vnet_sw_if_index_name, vnet_get_main (),
+ sw_if_index, (is_add ? "add" : "del"));
+
+ if (!is_add && sw_if_index != ~0)
+ {
+ ip46_type_t type;
+
+ FOREACH_IP46_TYPE (type) ip_neighbor_flush (type, sw_if_index);
+ }
+
+ return (NULL);
+}
+
+VNET_SW_INTERFACE_ADD_DEL_FUNCTION (ip_neighbor_delete_sw_interface);
+
+typedef struct ip_neighbor_walk_covered_ctx_t_
+{
+ ip46_type_t type;
+ ip46_address_t addr;
+ u32 length;
+ index_t *ipnis;
+} ip_neighbor_walk_covered_ctx_t;
+
+static walk_rc_t
+ip_neighbor_walk_covered (index_t ipni, void *arg)
+{
+ ip_neighbor_walk_covered_ctx_t *ctx = arg;
+ ip_neighbor_t *ipn;
+
+ ipn = ip_neighbor_get (ipni);
+
+ ASSERT (ipn->ipn_key->ipnk_type == ctx->type);
+
+ if (IP46_TYPE_IP4 == ctx->type)
+ {
+ if (ip4_destination_matches_route (&ip4_main,
+ &ipn->ipn_key->ipnk_ip.ip4,
+ &ctx->addr.ip4,
+ ctx->length) &&
+ ip_neighbor_is_dynamic (ipn))
+ {
+ vec_add1 (ctx->ipnis, ip_neighbor_get_index (ipn));
+ }
+ }
+ return (WALK_CONTINUE);
+}
+
+
+/*
+ * callback when an interface address is added or deleted
+ */
+static void
+ip_neighbor_add_del_interface_address_v4 (ip4_main_t * im,
+ uword opaque,
+ u32 sw_if_index,
+ ip4_address_t * address,
+ u32 address_length,
+ u32 if_address_index, u32 is_del)
+{
+ /*
+ * Flush the ARP cache of all entries covered by the address
+ * that is being removed.
+ */
+ IP_NEIGHBOR_DBG ("addr-%d: %U, %U/%d",
+ (is_del ? "del" : "add"),
+ format_vnet_sw_if_index_name, vnet_get_main (),
+ sw_if_index, format_ip4_address, address, address_length);
+
+ if (is_del)
+ {
+ ip_neighbor_walk_covered_ctx_t ctx = {
+ .addr.ip4 = *address,
+ .type = IP46_TYPE_IP4,
+ .length = address_length,
+ };
+ index_t *ipni;
+
+ ip_neighbor_walk (IP46_TYPE_IP4, sw_if_index,
+ ip_neighbor_walk_covered, &ctx);
+
+ vec_foreach (ipni, ctx.ipnis)
+ ip_neighbor_free (ip_neighbor_get (*ipni));
+
+ vec_free (ctx.ipnis);
+ }
+}
+
+/*
+ * callback when an interface address is added or deleted
+ */
+static void
+ip_neighbor_add_del_interface_address_v6 (ip6_main_t * im,
+ uword opaque,
+ u32 sw_if_index,
+ ip6_address_t * address,
+ u32 address_length,
+ u32 if_address_index, u32 is_del)
+{
+ /*
+ * Flush the ARP cache of all entries covered by the address
+ * that is being removed.
+ */
+ IP_NEIGHBOR_DBG ("addr-change: %U, %U/%d %s",
+ format_vnet_sw_if_index_name, vnet_get_main (),
+ sw_if_index, format_ip6_address, address, address_length,
+ (is_del ? "del" : "add"));
+
+ if (is_del)
+ {
+ ip_neighbor_walk_covered_ctx_t ctx = {
+ .addr.ip6 = *address,
+ .type = IP46_TYPE_IP6,
+ .length = address_length,
+ };
+ index_t *ipni;
+
+ ip_neighbor_walk (IP46_TYPE_IP6, sw_if_index,
+ ip_neighbor_walk_covered, &ctx);
+
+ vec_foreach (ipni, ctx.ipnis)
+ ip_neighbor_free (ip_neighbor_get (*ipni));
+
+ vec_free (ctx.ipnis);
+ }
+}
+
+typedef struct ip_neighbor_table_bind_ctx_t_
+{
+ u32 new_fib_index;
+ u32 old_fib_index;
+} ip_neighbor_table_bind_ctx_t;
+
+static walk_rc_t
+ip_neighbor_walk_table_bind (index_t ipni, void *arg)
+{
+ ip_neighbor_table_bind_ctx_t *ctx = arg;
+ ip_neighbor_t *ipn;
+
+ ipn = ip_neighbor_get (ipni);
+ ip_neighbor_adj_fib_remove (ipn, ctx->old_fib_index);
+ ip_neighbor_adj_fib_add (ipn, ctx->new_fib_index);
+
+ return (WALK_CONTINUE);
+}
+
+static void
+ip_neighbor_table_bind_v4 (ip4_main_t * im,
+ uword opaque,
+ u32 sw_if_index,
+ u32 new_fib_index, u32 old_fib_index)
+{
+ ip_neighbor_table_bind_ctx_t ctx = {
+ .old_fib_index = old_fib_index,
+ .new_fib_index = new_fib_index,
+ };
+
+ ip_neighbor_walk (IP46_TYPE_IP4, sw_if_index,
+ ip_neighbor_walk_table_bind, &ctx);
+}
+
+static void
+ip_neighbor_table_bind_v6 (ip6_main_t * im,
+ uword opaque,
+ u32 sw_if_index,
+ u32 new_fib_index, u32 old_fib_index)
+{
+ ip_neighbor_table_bind_ctx_t ctx = {
+ .old_fib_index = old_fib_index,
+ .new_fib_index = new_fib_index,
+ };
+
+ ip_neighbor_walk (IP46_TYPE_IP6, sw_if_index,
+ ip_neighbor_walk_table_bind, &ctx);
+}
+
+typedef enum ip_neighbor_age_state_t_
+{
+ IP_NEIGHBOR_AGE_ALIVE,
+ IP_NEIGHBOR_AGE_PROBE,
+ IP_NEIGHBOR_AGE_DEAD,
+} ip_neighbor_age_state_t;
+
+#define IP_NEIGHBOR_PROCESS_SLEEP_LONG (0)
+
+static ip_neighbor_age_state_t
+ip_neighbour_age_out (index_t ipni, f64 now, f64 * wait)
+{
+ ip_neighbor_t *ipn;
+ f64 ttl;
+
+ ipn = ip_neighbor_get (ipni);
+ ttl = now - ipn->ipn_time_last_updated;
+ *wait = IP_NEIGHBOR_PROCESS_SLEEP_LONG;
+
+ if (ttl > ip_neighbor_db[ipn->ipn_key->ipnk_type].ipndb_age)
+ {
+ IP_NEIGHBOR_DBG ("aged: %U @%f - %f > %d",
+ format_ip_neighbor, ipni, now,
+ ipn->ipn_time_last_updated,
+ ip_neighbor_db[ipn->ipn_key->ipnk_type].ipndb_age);
+ if (ipn->ipn_n_probes > 2)
+ {
+ /* 3 strikes and yea-re out */
+ IP_NEIGHBOR_DBG ("dead: %U", format_ip_neighbor, ipni);
+ return (IP_NEIGHBOR_AGE_DEAD);
+ }
+ else
+ {
+ adj_index_t ai;
+
+ ai = adj_glean_get (fib_proto_from_ip46 (ipn->ipn_key->ipnk_type),
+ ip_neighbor_get_sw_if_index (ipn));
+
+ if (ADJ_INDEX_INVALID != ai)
+ ip_neighbor_probe_dst (adj_get (ai), ip_neighbor_get_ip (ipn));
+
+ ipn->ipn_n_probes++;
+ *wait = 1;
+ }
+ }
+ else
+ {
+ *wait = ttl;
+ return (IP_NEIGHBOR_AGE_ALIVE);
+ }
+
+ return (IP_NEIGHBOR_AGE_PROBE);
+}
+
+typedef enum ip_neighbor_process_event_t_
+{
+ IP_NEIGHBOR_AGE_PROCESS_WAKEUP,
+} ip_neighbor_process_event_t;
+
+static uword
+ip_neighbor_age_loop (vlib_main_t * vm,
+ vlib_node_runtime_t * rt,
+ vlib_frame_t * f, ip46_type_t type)
+{
+ uword event_type, *event_data = NULL;
+ f64 timeout;
+
+ /* Set the timeout to an effectively infinite value when the process starts */
+ timeout = IP_NEIGHBOR_PROCESS_SLEEP_LONG;
+
+ while (1)
+ {
+ f64 now;
+
+ if (!timeout)
+ vlib_process_wait_for_event (vm);
+ else
+ vlib_process_wait_for_event_or_clock (vm, timeout);
+
+ event_type = vlib_process_get_events (vm, &event_data);
+ vec_reset_length (event_data);
+
+ now = vlib_time_now (vm);
+
+ switch (event_type)
+ {
+ case ~0:
+ {
+ /* timer expired */
+ ip_neighbor_elt_t *elt, *head;
+ f64 wait;
+
+ timeout = 1e5;
+ head = pool_elt_at_index (ip_neighbor_elt_pool,
+ ip_neighbor_list_head[type]);
+
+ /* *INDENT-OFF*/
+ /* the list is time sorted, newest first, so start from the back
+ * and work forwards. Stop when we get to one that is alive */
+ restart:
+ clib_llist_foreach_reverse(ip_neighbor_elt_pool,
+ ipne_anchor, head, elt,
+ ({
+ ip_neighbor_age_state_t res;
+
+ res = ip_neighbour_age_out(elt->ipne_index, now, &wait);
+
+ if (IP_NEIGHBOR_AGE_ALIVE == res) {
+ /* the oldest neighbor has not yet expired, go back to sleep */
+ break;
+ }
+ else if (IP_NEIGHBOR_AGE_DEAD == res) {
+ /* the oldest neighbor is dead, pop it, then restart the walk
+ * again from the back */
+ ip_neighbor_free (ip_neighbor_get(elt->ipne_index));
+ goto restart;
+ }
+
+ timeout = clib_min (wait, timeout);
+ }));
+ /* *INDENT-ON* */
+ break;
+ }
+ case IP_NEIGHBOR_AGE_PROCESS_WAKEUP:
+ {
+
+ if (!ip_neighbor_db[type].ipndb_age)
+ {
+ /* aging has been disabled */
+ timeout = 0;
+ break;
+ }
+ ip_neighbor_elt_t *elt, *head;
+
+ head = pool_elt_at_index (ip_neighbor_elt_pool,
+ ip_neighbor_list_head[type]);
+ elt = clib_llist_prev (ip_neighbor_elt_pool, ipne_anchor, head);
+
+ /* poke the oldset neighbour for aging, which returns how long we sleep for */
+ if (IP_NEIGHBOR_AGE_PROBE ==
+ ip_neighbour_age_out (elt->ipne_index, now, &timeout))
+ /* we probed for the oldest entry, sleep for a short time to get to the next */
+ timeout = 0.01;
+ break;
+ }
+ }
+ }
+ return 0;
+}
+
+static uword
+ip4_neighbor_age_process (vlib_main_t * vm,
+ vlib_node_runtime_t * rt, vlib_frame_t * f)
+{
+ return (ip_neighbor_age_loop (vm, rt, f, IP46_TYPE_IP4));
+}
+
+static uword
+ip6_neighbor_age_process (vlib_main_t * vm,
+ vlib_node_runtime_t * rt, vlib_frame_t * f)
+{
+ return (ip_neighbor_age_loop (vm, rt, f, IP46_TYPE_IP6));
+}
+
+/* *INDENT-OFF* */
+VLIB_REGISTER_NODE (ip4_neighbor_age_process_node,static) = {
+ .function = ip4_neighbor_age_process,
+ .type = VLIB_NODE_TYPE_PROCESS,
+ .name = "ip4-neighbor-age-process",
+};
+VLIB_REGISTER_NODE (ip6_neighbor_age_process_node,static) = {
+ .function = ip6_neighbor_age_process,
+ .type = VLIB_NODE_TYPE_PROCESS,
+ .name = "ip6-neighbor-age-process",
+};
+/* *INDENT-ON* */
+
+int
+ip_neighbor_config (ip46_type_t type, u32 limit, u32 age, bool recycle)
+{
+ ip_neighbor_db[type].ipndb_limit = limit;
+ ip_neighbor_db[type].ipndb_recycle = recycle;
+ ip_neighbor_db[type].ipndb_age = age;
+
+ vlib_process_signal_event (vlib_get_main (),
+ (IP46_TYPE_IP4 == type ?
+ ip4_neighbor_age_process_node.index :
+ ip6_neighbor_age_process_node.index),
+ IP_NEIGHBOR_AGE_PROCESS_WAKEUP, 0);
+
+ return (0);
+}
+
+static clib_error_t *
+ip_neighbor_config_show (vlib_main_t * vm,
+ unformat_input_t * input, vlib_cli_command_t * cmd)
+{
+ ip46_type_t type;
+
+ /* *INDENT-OFF* */
+ FOREACH_IP46_TYPE(type) {
+ vlib_cli_output (vm, "%U:", format_ip46_type, type);
+ vlib_cli_output (vm, " limit:%d, age:%d, recycle:%d",
+ ip_neighbor_db[type].ipndb_limit,
+ ip_neighbor_db[type].ipndb_age,
+ ip_neighbor_db[type].ipndb_recycle);
+ }
+
+ /* *INDENT-ON* */
+ return (NULL);
+}
+
+/* *INDENT-OFF* */
+VLIB_CLI_COMMAND (show_ip_neighbor_cfg_cmd_node, static) = {
+ .path = "show ip neighbor-config",
+ .function = ip_neighbor_config_show,
+ .short_help = "show ip neighbor-config",
+};
+/* *INDENT-ON* */
+
+static clib_error_t *
+ip_neighbor_init (vlib_main_t * vm)
+{
+ {
+ ip4_add_del_interface_address_callback_t cb = {
+ .function = ip_neighbor_add_del_interface_address_v4,
+ };
+ vec_add1 (ip4_main.add_del_interface_address_callbacks, cb);
+ }
+ {
+ ip6_add_del_interface_address_callback_t cb = {
+ .function = ip_neighbor_add_del_interface_address_v6,
+ };
+ vec_add1 (ip6_main.add_del_interface_address_callbacks, cb);
+ }
+ {
+ ip4_table_bind_callback_t cb = {
+ .function = ip_neighbor_table_bind_v4,
+ };
+ vec_add1 (ip4_main.table_bind_callbacks, cb);
+ }
+ {
+ ip6_table_bind_callback_t cb = {
+ .function = ip_neighbor_table_bind_v6,
+ };
+ vec_add1 (ip6_main.table_bind_callbacks, cb);
+ }
+ {
+ ethernet_address_change_ctx_t ctx = {
+ .function = ip_neighbor_ethernet_change_mac,
+ .function_opaque = 0,
+ };
+ vec_add1 (ethernet_main.address_change_callbacks, ctx);
+ }
+
+ ipn_logger = vlib_log_register_class ("ip", "neighbor");
+
+ ip46_type_t type;
+
+ FOREACH_IP46_TYPE (type)
+ ip_neighbor_list_head[type] =
+ clib_llist_make_head (ip_neighbor_elt_pool, ipne_anchor);
+
+ return (NULL);
+}
+
+/* *INDENT-OFF* */
+VLIB_INIT_FUNCTION (ip_neighbor_init) =
+{
+ .runs_after = VLIB_INITS("ip_main_init"),
+};
+/* *INDENT-ON* */
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */