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
|
/*
* gre_interface.c: gre interfaces
*
* 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.
*/
#include <vnet/vnet.h>
#include <vnet/pg/pg.h>
#include <vnet/gre/gre.h>
int
gre_register_interface (vnet_main_t * vnm,
u32 dev_class_index,
ip4_address_t *tunnel_src,
ip4_address_t *tunnel_dst,
u32 outer_fib_id,
u32 * gi_index_return)
{
gre_main_t * gm = &gre_main;
ip4_main_t * im = &ip4_main;
gre_tunnel_t * t;
vnet_hw_interface_t * hi;
u32 hw_if_index;
u32 slot;
u32 outer_fib_index;
uword * p;
u64 key = (u64)tunnel_src->as_u32 << 32 | (u64)tunnel_dst->as_u32;
/* check if same src/dst pair exists */
if (hash_get (gm->tunnel_by_key, key))
return VNET_API_ERROR_INVALID_VALUE;
p = hash_get (im->fib_index_by_table_id, outer_fib_id);
if (! p)
return VNET_API_ERROR_NO_SUCH_FIB;
outer_fib_index = p[0];
pool_get (gm->tunnels, t);
memset (t, 0, sizeof (*t));
hw_if_index = vnet_register_interface
(vnm, gre_device_class.index, t - gm->tunnels,
gre_hw_interface_class.index,
t - gm->tunnels);
*gi_index_return = t - gm->tunnels;
t->hw_if_index = hw_if_index;
t->outer_fib_index = outer_fib_index;
hi = vnet_get_hw_interface (vnm, hw_if_index);
hi->min_packet_bytes = 64 + sizeof (gre_header_t) + sizeof (ip4_header_t);
hi->per_packet_overhead_bytes =
/* preamble */ 8 + /* inter frame gap */ 12;
/* Standard default gre MTU. */
hi->max_l3_packet_bytes[VLIB_RX] = hi->max_l3_packet_bytes[VLIB_TX] = 9000;
memcpy (&t->tunnel_src, tunnel_src, sizeof (t->tunnel_src));
memcpy (&t->tunnel_dst, tunnel_dst, sizeof (t->tunnel_dst));
hash_set (gm->tunnel_by_key, key, t - gm->tunnels);
slot = vlib_node_add_named_next_with_slot
(vnm->vlib_main, hi->tx_node_index, "ip4-lookup", GRE_OUTPUT_NEXT_LOOKUP);
ASSERT (slot == GRE_OUTPUT_NEXT_LOOKUP);
return 0;
}
static clib_error_t *
create_gre_tunnel_command_fn (vlib_main_t * vm,
unformat_input_t * input,
vlib_cli_command_t * cmd)
{
unformat_input_t _line_input, * line_input = &_line_input;
vnet_main_t * vnm = vnet_get_main();
ip4_address_t src, dst;
u32 outer_fib_id = 0;
int rv;
u32 gi_index;
u32 num_m_args = 0;
/* Get a line of input. */
if (! unformat_user (input, unformat_line_input, line_input))
return 0;
while (unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT) {
if (unformat (line_input, "src %U", unformat_ip4_address, &src))
num_m_args++;
else if (unformat (line_input, "dst %U", unformat_ip4_address, &dst))
num_m_args++;
else if (unformat (line_input, "outer-fib-id %d", &outer_fib_id))
;
else
return clib_error_return (0, "unknown input `%U'",
format_unformat_error, input);
}
unformat_free (line_input);
if (num_m_args < 2)
return clib_error_return (0, "mandatory argument(s) missing");
rv = gre_register_interface (vnm, gre_hw_interface_class.index,
&src, &dst, outer_fib_id, &gi_index);
switch(rv)
{
case 0:
break;
case VNET_API_ERROR_INVALID_VALUE:
return clib_error_return (0, "GRE tunnel already exists...");
case VNET_API_ERROR_NO_SUCH_FIB:
return clib_error_return (0, "outer fib ID %d doesn't exist\n",
outer_fib_id);
default:
return clib_error_return (0, "gre_register_interface returned %d", rv);
}
return 0;
}
VLIB_CLI_COMMAND (create_gre_tunnel_command, static) = {
.path = "create gre tunnel",
.short_help = "create gre tunnel src <addr> dst <addr> [outer-fib-id <fib>]",
.function = create_gre_tunnel_command_fn,
};
/* force inclusion from application's main.c */
clib_error_t *gre_interface_init (vlib_main_t *vm)
{
return 0;
}
VLIB_INIT_FUNCTION(gre_interface_init);
|
