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diff --git a/src/plugins/igmp/igmp_config.h b/src/plugins/igmp/igmp_config.h
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+/*
+ *------------------------------------------------------------------
+ * 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.
+ *------------------------------------------------------------------
+ */
+
+#ifndef __IGMP_CONFIG_H__
+#define __IGMP_CONFIG_H__
+
+#include <igmp/igmp_types.h>
+#include <igmp/igmp_timer.h>
+#include <igmp/igmp_group.h>
+
+typedef enum igmp_config_timer_type_t_
+{
+ /**
+ * On expiry send a general report
+ */
+ IGMP_CONFIG_TIMER_GENERAL_REPORT,
+
+ /**
+ * On expiry send a general query
+ */
+ IGMP_CONFIG_TIMER_GENERAL_QUERY,
+} igmp_config_timer_type_t;
+
+#define IGMP_CONFIG_N_TIMERS (IGMP_CONFIG_TIMER_GENERAL_QUERY + 1)
+
+/**
+ * @brief IGMP interface configuration
+*/
+typedef struct igmp_config_t_
+{
+ /**
+ * @param sw_if_index - interface sw_if_index
+ */
+ u32 sw_if_index;
+
+ /**
+ * @param adj_index - multicast adjacency index on the link
+ */
+ adj_index_t adj_index;
+
+ /**
+ * @param moe - host or router
+ */
+ igmp_mode_t mode;
+
+ /**
+ * Robustness variable (seciotn 5.1)
+ */
+ u8 robustness_var;
+
+ /**
+ * Database of groups joined on the link
+ */
+ uword *igmp_group_by_key;
+
+ /**
+ * A vector of scheduled query-respone timers
+ */
+ igmp_timer_id_t timers[IGMP_CONFIG_N_TIMERS];
+} igmp_config_t;
+
+#define FOR_EACH_GROUP(_group, _config, _body) \
+do { \
+ igmp_key_t *__key__; \
+ u32 __gid__; \
+ hash_foreach_mem(__key__, __gid__, _config->igmp_group_by_key, \
+ ({ \
+ _group = pool_elt_at_index(igmp_main.groups, __gid__); \
+ do { _body; } while (0); \
+ })); \
+ } while (0);
+
+/**
+ * @brief igmp clear config
+ * @param config - igmp configuration
+ *
+ * Clear all (S,G)s on specified config and remove this config from pool.
+ */
+extern void igmp_clear_config (igmp_config_t * config);
+
+/**
+ * @brief igmp config lookup
+ * @param im - igmp main
+ * @param sw_if_index - interface sw_if_index
+ */
+extern igmp_config_t *igmp_config_lookup (u32 sw_if_index);
+
+/**
+ * Get the pool index for a config
+ */
+extern u32 igmp_config_index (const igmp_config_t * c);
+
+/**
+ * Get the config from the pool index
+ */
+extern igmp_config_t *igmp_config_get (u32 index);
+
+/**
+ * @brief igmp group lookup
+ * @param config - igmp configuration
+ * @param key - igmp key
+*/
+extern igmp_group_t *igmp_group_lookup (igmp_config_t * config,
+ const igmp_key_t * key);
+
+#endif
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */