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
|
/*
* Copyright (c) 2015 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 <vppinfra/error.h>
#include <vppinfra/hash.h>
#include <vnet/vnet.h>
#include <vnet/ip/ip.h>
#include <vnet/udp/udp_local.h>
#include <vnet/ethernet/ethernet.h>
#include <vnet/vxlan-gpe/vxlan_gpe.h>
#include <ioam/lib-vxlan-gpe/vxlan_gpe_ioam_packet.h>
#include <ioam/lib-vxlan-gpe/vxlan_gpe_ioam.h>
#include <ioam/lib-vxlan-gpe/vxlan_gpe_ioam_util.h>
#include <vnet/fib/ip4_fib.h>
#include <vnet/fib/fib_entry.h>
/* Statistics (not really errors) */
#define foreach_vxlan_gpe_transit_ioam_error \
_(ENCAPSULATED, "good packets encapsulated")
static char *vxlan_gpe_transit_ioam_error_strings[] = {
#define _(sym,string) string,
foreach_vxlan_gpe_transit_ioam_error
#undef _
};
typedef enum
{
#define _(sym,str) VXLAN_GPE_TRANSIT_IOAM_ERROR_##sym,
foreach_vxlan_gpe_transit_ioam_error
#undef _
VXLAN_GPE_TRANSIT_IOAM_N_ERROR,
} vxlan_gpe_transit_ioam_error_t;
typedef enum
{
VXLAN_GPE_TRANSIT_IOAM_NEXT_OUTPUT,
VXLAN_GPE_TRANSIT_IOAM_NEXT_DROP,
VXLAN_GPE_TRANSIT_IOAM_N_NEXT
} vxlan_gpe_transit_ioam_next_t;
VNET_FEATURE_INIT (vxlan_gpe_transit_ioam, static) =
{
.arc_name = "ip4-output",
.node_name = "vxlan-gpe-transit-ioam",
.runs_before = VNET_FEATURES ("interface-output"),
};
static uword
vxlan_gpe_transit_ioam (vlib_main_t * vm,
vlib_node_runtime_t * node, vlib_frame_t * from_frame)
{
u32 n_left_from, next_index, *from, *to_next;
from = vlib_frame_vector_args (from_frame);
n_left_from = from_frame->n_vectors;
next_index = node->cached_next_index;
while (n_left_from > 0)
{
u32 n_left_to_next;
vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
while (n_left_from > 0 && n_left_to_next > 0)
{
u32 bi0;
vlib_buffer_t *b0;
u32 next0 = VXLAN_GPE_TRANSIT_IOAM_NEXT_OUTPUT;
bi0 = from[0];
to_next[0] = bi0;
from += 1;
to_next += 1;
n_left_from -= 1;
n_left_to_next -= 1;
ip4_header_t *ip0;
u32 iph_offset = 0;
b0 = vlib_get_buffer (vm, bi0);
iph_offset = vnet_buffer (b0)->ip.save_rewrite_length;
ip0 = (ip4_header_t *) ((u8 *) vlib_buffer_get_current (b0)
+ iph_offset);
/* just forward non ipv4 packets */
if (PREDICT_FALSE
((ip0->ip_version_and_header_length & 0xF0) == 0x40))
{
/* ipv4 packets */
udp_header_t *udp_hdr0 = (udp_header_t *) (ip0 + 1);
if (PREDICT_FALSE
((ip0->protocol == IP_PROTOCOL_UDP) &&
(clib_net_to_host_u16 (udp_hdr0->dst_port) ==
UDP_DST_PORT_VXLAN_GPE)))
{
/* Check the iOAM header */
vxlan_gpe_header_t *gpe_hdr0 =
(vxlan_gpe_header_t *) (udp_hdr0 + 1);
if (PREDICT_FALSE
(gpe_hdr0->protocol == VXLAN_GPE_PROTOCOL_IOAM))
{
uword *t = NULL;
vxlan_gpe_ioam_main_t *hm = &vxlan_gpe_ioam_main;
fib_prefix_t key4;
clib_memset (&key4, 0, sizeof (key4));
key4.fp_proto = FIB_PROTOCOL_IP4;
key4.fp_addr.ip4.as_u32 = ip0->dst_address.as_u32;
t = hash_get_mem (hm->dst_by_ip4, &key4);
if (t)
{
vlib_buffer_advance (b0,
(word) (sizeof
(ethernet_header_t)));
vxlan_gpe_encap_decap_ioam_v4_one_inline (vm, node,
b0,
&next0,
VXLAN_GPE_TRANSIT_IOAM_NEXT_DROP,
1
/* use_adj */
);
vlib_buffer_advance (b0,
-(word) (sizeof
(ethernet_header_t)));
}
}
}
}
vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
n_left_to_next, bi0, next0);
}
vlib_put_next_frame (vm, node, next_index, n_left_to_next);
}
return from_frame->n_vectors;
}
VLIB_REGISTER_NODE (vxlan_gpe_transit_ioam_node) = {
.function = vxlan_gpe_transit_ioam,
.name = "vxlan-gpe-transit-ioam",
.vector_size = sizeof (u32),
.format_trace = format_vxlan_gpe_ioam_v4_trace,
.type = VLIB_NODE_TYPE_INTERNAL,
.n_errors = ARRAY_LEN(vxlan_gpe_transit_ioam_error_strings),
.error_strings = vxlan_gpe_transit_ioam_error_strings,
.n_next_nodes = VXLAN_GPE_TRANSIT_IOAM_N_NEXT,
.next_nodes = {
[VXLAN_GPE_TRANSIT_IOAM_NEXT_OUTPUT] = "interface-output",
[VXLAN_GPE_TRANSIT_IOAM_NEXT_DROP] = "error-drop",
},
};
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/
|
