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-rw-r--r--src/vnet/ip-neighbor/ip_neighbor_watch.c283
1 files changed, 283 insertions, 0 deletions
diff --git a/src/vnet/ip-neighbor/ip_neighbor_watch.c b/src/vnet/ip-neighbor/ip_neighbor_watch.c
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+++ b/src/vnet/ip-neighbor/ip_neighbor_watch.c
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+/*
+ * ip_neighboor_watch.c; IP neighbor watching
+ *
+ * Copyright (c) 2019 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 <vnet/ip-neighbor/ip_neighbor.h>
+#include <vnet/ip/ip_types_api.h>
+#include <vnet/ethernet/ethernet_types_api.h>
+
+#include <vnet/ip-neighbor/ip_neighbor.api_enum.h>
+#include <vnet/ip-neighbor/ip_neighbor.api_types.h>
+
+#include <vlibmemory/api.h>
+
+/**
+ * Database of registered watchers
+ * The key for a watcher is {type, sw_if_index, addreess}
+ * interface=~0 / address=all-zeros imples any.
+ */
+typedef struct ip_neighbor_watch_db_t_
+{
+ mhash_t ipnwdb_hash;
+} ip_neighbor_watch_db_t;
+
+static ip_neighbor_watch_db_t ipnw_db;
+
+static uword
+ip_neighbor_event_process (vlib_main_t * vm,
+ vlib_node_runtime_t * rt, vlib_frame_t * f)
+{
+ ip_neighbor_event_t *ipne, *ipnes = NULL;
+ uword event_type = ~0;
+
+ while (1)
+ {
+ vlib_process_wait_for_event (vm);
+
+ ipnes = vlib_process_get_event_data (vm, &event_type);
+
+ switch (event_type)
+ {
+ default:
+ vec_foreach (ipne, ipnes) ip_neighbor_handle_event (ipne);
+ break;
+
+ case ~0:
+ /* timeout - */
+ break;
+ }
+
+ vec_reset_length (ipnes);
+ }
+ return 0;
+}
+
+/* *INDENT-OFF* */
+VLIB_REGISTER_NODE (ip_neighbor_event_process_node) = {
+ .function = ip_neighbor_event_process,
+ .type = VLIB_NODE_TYPE_PROCESS,
+ .name = "ip-neighbor-event",
+};
+/* *INDENT-ON* */
+
+
+static clib_error_t *
+want_ip_neighbor_events_reaper (u32 client_index)
+{
+ ip_neighbor_key_t *key, *empty_keys = NULL;
+ ip_neighbor_watcher_t *watchers;
+ uword *v;
+ i32 pos;
+
+ /* walk the entire IP neighbour DB and removes the client's registrations */
+ /* *INDENT-OFF* */
+ mhash_foreach(key, v, &ipnw_db.ipnwdb_hash,
+ ({
+ watchers = (ip_neighbor_watcher_t*) *v;
+
+ vec_foreach_index_backwards (pos, watchers) {
+ if (watchers[pos].ipw_client == client_index)
+ vec_del1(watchers, pos);
+ }
+
+ if (vec_len(watchers) == 0)
+ vec_add1 (empty_keys, *key);
+ }));
+ /* *INDENT-OFF* */
+
+ vec_foreach (key, empty_keys)
+ mhash_unset (&ipnw_db.ipnwdb_hash, key, NULL);
+ vec_free (empty_keys);
+ return (NULL);
+}
+
+VL_MSG_API_REAPER_FUNCTION (want_ip_neighbor_events_reaper);
+
+static int
+ip_neighbor_watch_cmp (const ip_neighbor_watcher_t * w1,
+ const ip_neighbor_watcher_t * w2)
+{
+ return (0 == clib_memcmp (w1, w2, sizeof(*w1)));
+}
+
+void
+ip_neighbor_watch (const ip46_address_t * ip,
+ ip46_type_t type,
+ u32 sw_if_index,
+ const ip_neighbor_watcher_t * watch)
+{
+ ip_neighbor_key_t key = {
+ .ipnk_ip = *ip,
+ .ipnk_sw_if_index = (sw_if_index == 0 ? ~0 : sw_if_index),
+ .ipnk_type = type,
+ };
+ ip_neighbor_watcher_t *ipws = NULL;
+ uword *p;
+
+ p = mhash_get (&ipnw_db.ipnwdb_hash, &key);
+
+ if (p)
+ {
+ ipws = (ip_neighbor_watcher_t*) p[0];
+
+ if (~0 != vec_search_with_function (ipws, watch,
+ ip_neighbor_watch_cmp))
+ /* duplicate */
+ return;
+ }
+
+ vec_add1 (ipws, *watch);
+
+ mhash_set (&ipnw_db.ipnwdb_hash, &key, (uword) ipws, NULL);
+}
+
+void
+ip_neighbor_unwatch (const ip46_address_t * ip,
+ ip46_type_t type,
+ u32 sw_if_index,
+ const ip_neighbor_watcher_t * watch)
+{
+ ip_neighbor_key_t key = {
+ .ipnk_ip = *ip,
+ .ipnk_sw_if_index = (sw_if_index == 0 ? ~0 : sw_if_index),
+ .ipnk_type = type,
+ };
+ ip_neighbor_watcher_t *ipws = NULL;
+ uword *p;
+ u32 pos;
+
+ p = mhash_get (&ipnw_db.ipnwdb_hash, &key);
+
+ if (!p)
+ return;
+
+ ipws = (ip_neighbor_watcher_t*) p[0];
+
+ pos = vec_search_with_function (ipws, watch, ip_neighbor_watch_cmp);
+
+ if (~0 == pos)
+ return;
+
+ vec_del1 (ipws, pos);
+
+ if (vec_len(ipws) == 0)
+ mhash_unset (&ipnw_db.ipnwdb_hash, &key, NULL);
+}
+
+static void
+ip_neighbor_signal (ip_neighbor_watcher_t *watchers, index_t ipni)
+{
+ ip_neighbor_watcher_t *watcher;
+
+ vec_foreach (watcher, watchers) {
+ ip_neighbor_event_t *ipne;
+
+ ipne = vlib_process_signal_event_data (vlib_get_main(),
+ ip_neighbor_event_process_node.index,
+ 0, 1, sizeof(*ipne));
+ ipne->ipne_watch = *watcher;
+ ipne->ipne_index = ipni;
+ }
+}
+
+void
+ip_neighbor_publish (index_t ipni)
+{
+ const ip_neighbor_t *ipn;
+ ip_neighbor_key_t key;
+ uword *p;
+
+ ipn = ip_neighbor_get (ipni);
+
+ clib_memcpy (&key, ipn->ipn_key, sizeof (key));
+
+ /* Search the DB from longest to shortest key */
+ p = mhash_get (&ipnw_db.ipnwdb_hash, &key);
+
+ if (p) {
+ ip_neighbor_signal ((ip_neighbor_watcher_t*) p[0], ipni);
+ }
+
+ ip46_address_reset (&key.ipnk_ip);
+ p = mhash_get (&ipnw_db.ipnwdb_hash, &key);
+
+ if (p) {
+ ip_neighbor_signal ((ip_neighbor_watcher_t*) p[0], ipni);
+ }
+
+ key.ipnk_sw_if_index = ~0;
+ p = mhash_get (&ipnw_db.ipnwdb_hash, &key);
+
+ if (p) {
+ ip_neighbor_signal ((ip_neighbor_watcher_t*) p[0], ipni);
+ }
+}
+
+static clib_error_t *
+ip_neighbor_watchers_show (vlib_main_t * vm,
+ unformat_input_t * input,
+ vlib_cli_command_t * cmd)
+{
+ ip_neighbor_watcher_t *watchers, *watcher;
+ ip_neighbor_key_t *key;
+ uword *v;
+
+ /* *INDENT-OFF* */
+ mhash_foreach(key, v, &ipnw_db.ipnwdb_hash,
+ ({
+ watchers = (ip_neighbor_watcher_t*) *v;
+
+ ASSERT(vec_len(watchers));
+ vlib_cli_output (vm, "Key: %U", format_ip_neighbor_key, key);
+
+ vec_foreach (watcher, watchers)
+ vlib_cli_output (vm, " %U", format_ip_neighbor_watcher, watcher);
+ }));
+ /* *INDENT-ON* */
+ return (NULL);
+}
+
+/* *INDENT-OFF* */
+VLIB_CLI_COMMAND (show_ip_neighbor_watchers_cmd_node, static) = {
+ .path = "show ip neighbor-watcher",
+ .function = ip_neighbor_watchers_show,
+ .short_help = "show ip neighbors-watcher",
+};
+/* *INDENT-ON* */
+
+static clib_error_t *
+ip_neighbor_watch_init (vlib_main_t * vm)
+{
+ mhash_init (&ipnw_db.ipnwdb_hash,
+ sizeof (ip_neighbor_watcher_t *), sizeof (ip_neighbor_key_t));
+ return (NULL);
+}
+
+/* *INDENT-OFF* */
+VLIB_INIT_FUNCTION (ip_neighbor_watch_init) =
+{
+ .runs_after = VLIB_INITS("ip_neighbor_init"),
+};
+/* *INDENT-ON* */
+
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */