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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.
*/
#ifndef __UDP_ENCAP_H__
#define __UDP_ENCAP_H__
#include <vnet/ip/ip.h>
#include <vnet/udp/udp.h>
#include <vnet/fib/fib_node.h>
/**
* UDP encapsualtion.
* A representation of the encapsulation of packets in UDP-over-IP.
* This is encapsulation only, there is no tunnel interface, hence
* it is uni-directional. For decap register a handler with the UDP port
* dispatcher.
*/
/**
* Fixup behaviour. Actions performed on the encap in the data-plance
*/
typedef enum udp_encap_fixup_flags_t_
{
UDP_ENCAP_FIXUP_NONE = 0,
/**
* UDP source port contains an entropy/hash value for load-balancing by downstream peers.
*/
UDP_ENCAP_FIXUP_UDP_SRC_PORT_ENTROPY = (1 << 0),
} udp_encap_fixup_flags_t;
/**
* The UDP encap represenation
*/
typedef struct udp_encap_t_
{
/**
* The first cacheline contains the data used in the data-plane
*/
CLIB_CACHE_LINE_ALIGN_MARK (cacheline0);
/**
* The headers to paint, in packet painting order
*/
union
{
struct
{
ip4_header_t ue_ip4;
udp_header_t ue_udp;
} __attribute__ ((packed)) ip4;
struct
{
ip6_header_t ue_ip6;
udp_header_t ue_udp;
} __attribute__ ((packed)) ip6;
} __attribute__ ((packed)) ue_hdrs;
/**
* Flags controlling fixup behaviour
*/
udp_encap_fixup_flags_t ue_flags;
/**
* The DPO used to forward to the next node in the VLIB graph
*/
dpo_id_t ue_dpo;
/**
* the protocol of the IP header imposed
*/
fib_protocol_t ue_ip_proto;
/**
* The seond cacheline contains control-plane data
*/
CLIB_CACHE_LINE_ALIGN_MARK (cacheline1);
/**
* linkage into the FIB graph
*/
fib_node_t ue_fib_node;
/**
* Tracking information for the IP destination
*/
fib_node_index_t ue_fib_entry_index;
u32 ue_fib_sibling;
/**
* The FIB index in which the encap destination resides
*/
index_t ue_fib_index;
} udp_encap_t;
extern index_t udp_encap_add_and_lock (fib_protocol_t proto,
index_t fib_index,
const ip46_address_t * src_ip,
const ip46_address_t * dst_ip,
u16 src_port,
u16 dst_port,
udp_encap_fixup_flags_t flags);
extern void udp_encap_lock (index_t uei);
extern void udp_encap_unlock (index_t uei);
extern u8 *format_udp_encap (u8 * s, va_list * args);
extern void udp_encap_contribute_forwarding (index_t uei,
dpo_proto_t proto,
dpo_id_t * dpo);
extern void udp_encap_get_stats (index_t uei, u64 * packets, u64 * bytes);
/**
* Callback function invoked when walking all encap objects.
* Return non-zero to continue the walk.
*/
typedef walk_rc_t (*udp_encap_walk_cb_t) (index_t uei, void *ctx);
/**
* Walk each of the encap objects
*/
extern void udp_encap_walk (udp_encap_walk_cb_t cb, void *ctx);
/**
* Pool of encaps
*/
extern udp_encap_t *udp_encap_pool;
static inline udp_encap_t *
udp_encap_get (index_t uei)
{
return (pool_elt_at_index (udp_encap_pool, uei));
}
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/
#endif
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