1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
|
/*
* 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;
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;
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;
u8 teb;
/**
* 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;
typedef struct {
/* pool of tunnel instances */
gre_tunnel_t *tunnels;
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 */
u32 * free_gre_tunnel_hw_if_indices;
/* 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_l2_device_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 */
|
