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/*
* gre.h: types/functions for gre.
*
* Copyright (c) 2012 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 included_gre_h
#define included_gre_h
#include <vnet/vnet.h>
#include <vnet/gre/packet.h>
#include <vnet/ip/ip.h>
#include <vnet/ip/ip4.h>
#include <vnet/ip/ip4_packet.h>
#include <vnet/pg/pg.h>
#include <vnet/ip/format.h>
#include <vnet/adj/adj_types.h>
extern vnet_hw_interface_class_t gre_hw_interface_class;
typedef enum {
#define gre_error(n,s) GRE_ERROR_##n,
#include <vnet/gre/error.def>
#undef gre_error
GRE_N_ERROR,
} gre_error_t;
/**
* A GRE payload protocol registration
*/
typedef struct {
/** Name (a c string). */
char * name;
/** GRE protocol type in host byte order. */
gre_protocol_t protocol;
/** Node which handles this type. */
u32 node_index;
/** Next index for this type. */
u32 next_index;
} gre_protocol_info_t;
/**
* @brief The GRE tunnel type
*/
typedef enum gre_tunnel_tyoe_t_
{
/**
* L3 GRE (i.e. this tunnel is in L3 mode)
*/
GRE_TUNNEL_TYPE_L3,
/**
* Transparent Ethernet Bridging - the tunnel is in L2 mode
*/
GRE_TUNNEL_TYPE_TEB,
} gre_tunnel_type_t;
#define GRE_TUNNEL_TYPE_NAMES { \
[GRE_TUNNEL_TYPE_L3] = "L3", \
[GRE_TUNNEL_TYPE_TEB] = "TEB", \
}
#define GRE_TUNNEL_N_TYPES ((gre_tunnel_type_t)GRE_TUNNEL_TYPE_TEB+1)
/**
* @brief A representation of a GRE tunnel
*/
typedef struct {
/**
* Linkage into the FIB object graph
*/
fib_node_t node;
/**
* The tunnel's source/local address
*/
ip4_address_t tunnel_src;
/**
* The tunnel's destination/remote address
*/
ip4_address_t tunnel_dst;
/**
* The FIB in which the src.dst address are present
*/
u32 outer_fib_index;
u32 hw_if_index;
u32 sw_if_index;
gre_tunnel_type_t type;
/**
* The FIB entry sourced by the tunnel for its destination prefix
*/
fib_node_index_t fib_entry_index;
/**
* The tunnel is a child of the FIB entry for its desintion. This is
* so it receives updates when the forwarding information for that entry
* changes.
* The tunnels sibling index on the FIB entry's dependency list.
*/
u32 sibling_index;
/**
* on a L2 tunnel this is the VLIB arc from the L2-tx to the l2-midchain
*/
u32 l2_tx_arc;
/**
* an L2 tunnel always rquires an L2 midchain. cache here for DP.
*/
adj_index_t l2_adj_index;
} gre_tunnel_t;
/**
* @brief GRE related global data
*/
typedef struct {
/**
* pool of tunnel instances
*/
gre_tunnel_t *tunnels;
/**
* GRE payload protocol registrations
*/
gre_protocol_info_t * protocol_infos;
/**
* Hash tables mapping name/protocol to protocol info index.
*/
uword * protocol_info_by_name, * protocol_info_by_protocol;
/**
* Hash mapping src/dst addr pair to tunnel
*/
uword * tunnel_by_key;
/**
* Free vlib hw_if_indices.
* A free list per-tunnel type since the interfaces ctreated are fo different
* types and we cannot change the type.
*/
u32 * free_gre_tunnel_hw_if_indices[GRE_TUNNEL_N_TYPES];
/**
* Mapping from sw_if_index to tunnel index
*/
u32 * tunnel_index_by_sw_if_index;
/* convenience */
vlib_main_t * vlib_main;
vnet_main_t * vnet_main;
} gre_main_t;
/**
* @brief IPv4 and GRE header.
*/
typedef CLIB_PACKED (struct {
ip4_header_t ip4;
gre_header_t gre;
}) ip4_and_gre_header_t;
always_inline gre_protocol_info_t *
gre_get_protocol_info (gre_main_t * em, gre_protocol_t protocol)
{
uword * p = hash_get (em->protocol_info_by_protocol, protocol);
return p ? vec_elt_at_index (em->protocol_infos, p[0]) : 0;
}
gre_main_t gre_main;
/* Register given node index to take input for given gre type. */
void
gre_register_input_type (vlib_main_t * vm,
gre_protocol_t protocol,
u32 node_index);
extern clib_error_t * gre_interface_admin_up_down (vnet_main_t * vnm,
u32 hw_if_index,
u32 flags);
extern void gre_tunnel_stack (adj_index_t ai);
extern void gre_update_adj (vnet_main_t * vnm,
u32 sw_if_index,
adj_index_t ai);
format_function_t format_gre_protocol;
format_function_t format_gre_header;
format_function_t format_gre_header_with_length;
extern vlib_node_registration_t gre_input_node;
extern vnet_device_class_t gre_device_class;
extern vnet_device_class_t gre_device_teb_class;
/* Parse gre protocol as 0xXXXX or protocol name.
In either host or network byte order. */
unformat_function_t unformat_gre_protocol_host_byte_order;
unformat_function_t unformat_gre_protocol_net_byte_order;
/* Parse gre header. */
unformat_function_t unformat_gre_header;
unformat_function_t unformat_pg_gre_header;
void
gre_register_input_protocol (vlib_main_t * vm,
gre_protocol_t protocol,
u32 node_index);
/* manually added to the interface output node in gre.c */
#define GRE_OUTPUT_NEXT_LOOKUP 1
typedef struct {
u8 is_add;
ip4_address_t src, dst;
u32 outer_fib_id;
u8 teb;
} vnet_gre_add_del_tunnel_args_t;
int vnet_gre_add_del_tunnel
(vnet_gre_add_del_tunnel_args_t *a, u32 * sw_if_indexp);
#endif /* included_gre_h */
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