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/*
* Copyright (c) 2016 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.
*/
/**
* @brief Mcast Adjacency
*
* The multicast adjacency forwards IP traffic on an interface toward a multicast
* group address. This is a different type of adjacency to a unicast adjacency
* since the application of the MAC header is different, and so the VLIB node
* visited is also different. DPO types have different VLIB nodes.
*/
#ifndef __ADJ_MCAST_H__
#define __ADJ_MCAST_H__
#include <vnet/adj/adj_types.h>
#include <vnet/adj/adj_midchain.h>
/**
* @brief
* Add (and lock) a new or lock an existing mcast adjacency
*
* @param proto
* The protocol for the neighbours that we wish to mcast
*
* @param link_type
* A description of the protocol of the packets that will forward
* through this adj. On an ethernet interface this is the MAC header's
* ether-type
*
* @param sw_if_index
* The interface on which to mcast
*/
extern adj_index_t adj_mcast_add_or_lock(fib_protocol_t proto,
vnet_link_t link_type,
u32 sw_if_index);
/**
* @brief
* Update the rewrite string for an existing adjacecny.
*
* @param
* The index of the adj to update
*
* @param
* The new rewrite
*
* @param
* The offset in the rewrite a which to write in packet's
* IP Address
*
* @param
* The mask to apply to the packet berfore the rewrite.
*/
extern void adj_mcast_update_rewrite(adj_index_t adj_index,
u8 *rewrite,
u8 offset,
u32 mask);
/**
* @brief
* Update the rewrite string for an existing adjacecny and
* Convert the adjacency into a midchain
*
* @param
* The index of the adj to update
*
* @param fixup
* The function that will be invoked at paket switch time to 'fixup'
* the rewrite applied with necessary per-packet info (i.e. length, checksums).
* @param fixup_data
* Context data set by the caller that is provided as an argument in the
* fixup function.
*
* @param flags
* Flags controlling the adjacency behaviour
*
* @param
* The new rewrite
*/
extern void adj_mcast_midchain_update_rewrite(adj_index_t adj_index,
adj_midchain_fixup_t fixup,
const void *fixup_data,
adj_flags_t flags,
u8 *rewrite,
u8 offset,
u32 mask);
/**
* @brief Walk the multicast Adjacencies on a given interface
*/
extern void adj_mcast_walk (u32 sw_if_index,
fib_protocol_t adj_nh_proto,
adj_walk_cb_t cb,
void *ctx);
/**
* @brief Format/display a mcast adjacency.
*/
extern u8* format_adj_mcast(u8* s, va_list *ap);
extern u8* format_adj_mcast_midchain(u8* s, va_list *ap);
/**
* @brief Get the sze of the mcast adj DB. Test purposes only.
*/
extern u32 adj_mcast_db_size(void);
/**
* @brief
* Module initialisation
*/
extern void adj_mcast_module_init(void);
#endif
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