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
|
/*
* Copyright (c) 2018 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 <nat/dslite.h>
#include <nat/nat_inlines.h>
vlib_node_registration_t dslite_ce_decap_node;
typedef enum
{
DSLITE_CE_DECAP_NEXT_IP4_LOOKUP,
DSLITE_IN2OUT_NEXT_IP6_ICMP,
DSLITE_CE_DECAP_NEXT_DROP,
DSLITE_CE_DECAP_N_NEXT,
} dslite_ce_decap_next_t;
static char *dslite_ce_decap_error_strings[] = {
#define _(sym,string) string,
foreach_dslite_error
#undef _
};
static uword
dslite_ce_decap_node_fn (vlib_main_t * vm, vlib_node_runtime_t * node,
vlib_frame_t * frame)
{
u32 n_left_from, *from, *to_next;
dslite_ce_decap_next_t next_index;
from = vlib_frame_vector_args (frame);
n_left_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 = DSLITE_CE_DECAP_NEXT_IP4_LOOKUP;
u8 error0 = DSLITE_ERROR_CE_DECAP;
ip4_header_t *ip40;
ip6_header_t *ip60;
u32 proto0;
/* speculatively enqueue b0 to the current next frame */
bi0 = from[0];
to_next[0] = bi0;
from += 1;
to_next += 1;
n_left_from -= 1;
n_left_to_next -= 1;
b0 = vlib_get_buffer (vm, bi0);
ip60 = vlib_buffer_get_current (b0);
if (PREDICT_FALSE (ip60->protocol != IP_PROTOCOL_IP_IN_IP))
{
if (ip60->protocol == IP_PROTOCOL_ICMP6)
{
next0 = DSLITE_IN2OUT_NEXT_IP6_ICMP;
goto trace0;
}
error0 = DSLITE_ERROR_BAD_IP6_PROTOCOL;
next0 = DSLITE_CE_DECAP_NEXT_DROP;
goto trace0;
}
ip40 = vlib_buffer_get_current (b0) + sizeof (ip6_header_t);
proto0 = ip_proto_to_snat_proto (ip40->protocol);
if (PREDICT_FALSE (proto0 == ~0))
{
error0 = DSLITE_ERROR_UNSUPPORTED_PROTOCOL;
next0 = DSLITE_CE_DECAP_NEXT_DROP;
goto trace0;
}
ip40->tos =
(clib_net_to_host_u32
(ip60->ip_version_traffic_class_and_flow_label) & 0x0ff00000) >>
20;
vlib_buffer_advance (b0, sizeof (ip6_header_t));
trace0:
if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
&& (b0->flags & VLIB_BUFFER_IS_TRACED)))
{
dslite_trace_t *t = vlib_add_trace (vm, node, b0, sizeof (*t));
t->next_index = next0;
}
b0->error = node->errors[error0];
/* verify speculative enqueue, maybe switch current next frame */
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 frame->n_vectors;
}
/* *INDENT-OFF* */
VLIB_REGISTER_NODE (dslite_ce_decap_node) = {
.function = dslite_ce_decap_node_fn,
.name = "dslite-ce-decap",
.vector_size = sizeof (u32),
.format_trace = format_dslite_ce_trace,
.type = VLIB_NODE_TYPE_INTERNAL,
.n_errors = ARRAY_LEN (dslite_ce_decap_error_strings),
.error_strings = dslite_ce_decap_error_strings,
.n_next_nodes = DSLITE_CE_DECAP_N_NEXT,
/* edit / add dispositions here */
.next_nodes = {
[DSLITE_CE_DECAP_NEXT_DROP] = "error-drop",
[DSLITE_CE_DECAP_NEXT_IP4_LOOKUP] = "ip4-lookup",
[DSLITE_IN2OUT_NEXT_IP6_ICMP] = "ip6-icmp-input",
},
};
/* *INDENT-ON* */
VLIB_NODE_FUNCTION_MULTIARCH (dslite_ce_decap_node, dslite_ce_decap_node_fn);
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/
|
