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
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
|
/*
* 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.
*/
/**
* @file
* @brief NAT66 outside to inside network translation
*/
#include <nat/nat66/nat66.h>
#include <vnet/ip/ip6_to_ip4.h>
#include <vnet/fib/fib_table.h>
typedef struct
{
u32 sw_if_index;
u32 next_index;
} nat66_out2in_trace_t;
static u8 *
format_nat66_out2in_trace (u8 * s, va_list * args)
{
CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
nat66_out2in_trace_t *t = va_arg (*args, nat66_out2in_trace_t *);
s =
format (s, "NAT66-out2in: sw_if_index %d, next index %d", t->sw_if_index,
t->next_index);
return s;
}
#define foreach_nat66_out2in_error \
_(OUT2IN_PACKETS, "good out2in packets processed") \
_(NO_TRANSLATION, "no translation") \
_(UNKNOWN, "unknown")
typedef enum
{
#define _(sym,str) NAT66_OUT2IN_ERROR_##sym,
foreach_nat66_out2in_error
#undef _
NAT66_OUT2IN_N_ERROR,
} nat66_out2in_error_t;
static char *nat66_out2in_error_strings[] = {
#define _(sym,string) string,
foreach_nat66_out2in_error
#undef _
};
typedef enum
{
NAT66_OUT2IN_NEXT_IP6_LOOKUP,
NAT66_OUT2IN_NEXT_DROP,
NAT66_OUT2IN_N_NEXT,
} nat66_out2in_next_t;
VLIB_NODE_FN (nat66_out2in_node) (vlib_main_t * vm,
vlib_node_runtime_t * node,
vlib_frame_t * frame)
{
u32 n_left_from, *from, *to_next;
nat66_out2in_next_t next_index;
u32 pkts_processed = 0;
u32 thread_index = vm->thread_index;
nat66_main_t *nm = &nat66_main;
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 = NAT66_OUT2IN_NEXT_IP6_LOOKUP;
ip6_header_t *ip60;
u16 l4_offset0, frag_offset0;
u8 l4_protocol0;
nat66_static_mapping_t *sm0;
u32 sw_if_index0, fib_index0;
udp_header_t *udp0;
tcp_header_t *tcp0;
icmp46_header_t *icmp0;
u16 *checksum0 = 0;
ip_csum_t csum0;
/* 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
(ip6_parse
(vm, b0, ip60, b0->current_length, &l4_protocol0, &l4_offset0,
&frag_offset0)))
{
next0 = NAT66_OUT2IN_NEXT_DROP;
b0->error = node->errors[NAT66_OUT2IN_ERROR_UNKNOWN];
goto trace0;
}
sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
fib_index0 =
fib_table_get_index_for_sw_if_index (FIB_PROTOCOL_IP6,
sw_if_index0);
sm0 = nat66_static_mapping_get (&ip60->dst_address, fib_index0, 0);
if (PREDICT_FALSE (!sm0))
{
goto trace0;
}
if (l4_protocol0 == IP_PROTOCOL_UDP)
{
udp0 = (udp_header_t *) u8_ptr_add (ip60, l4_offset0);
checksum0 = &udp0->checksum;
}
else if (l4_protocol0 == IP_PROTOCOL_TCP)
{
tcp0 = (tcp_header_t *) u8_ptr_add (ip60, l4_offset0);
checksum0 = &tcp0->checksum;
}
else if (l4_protocol0 == IP_PROTOCOL_ICMP6)
{
icmp0 = (icmp46_header_t *) u8_ptr_add (ip60, l4_offset0);
checksum0 = &icmp0->checksum;
}
else
goto skip_csum0;
csum0 = ip_csum_sub_even (*checksum0, ip60->dst_address.as_u64[0]);
csum0 = ip_csum_sub_even (csum0, ip60->dst_address.as_u64[1]);
csum0 = ip_csum_add_even (csum0, sm0->l_addr.as_u64[0]);
csum0 = ip_csum_add_even (csum0, sm0->l_addr.as_u64[1]);
*checksum0 = ip_csum_fold (csum0);
skip_csum0:
ip60->dst_address.as_u64[0] = sm0->l_addr.as_u64[0];
ip60->dst_address.as_u64[1] = sm0->l_addr.as_u64[1];
vnet_buffer (b0)->sw_if_index[VLIB_TX] = sm0->fib_index;
vlib_increment_combined_counter (&nm->session_counters,
thread_index, sm0 - nm->sm, 1,
vlib_buffer_length_in_chain (vm,
b0));
trace0:
if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
&& (b0->flags & VLIB_BUFFER_IS_TRACED)))
{
nat66_out2in_trace_t *t =
vlib_add_trace (vm, node, b0, sizeof (*t));
t->sw_if_index = vnet_buffer (b0)->sw_if_index[VLIB_RX];
t->next_index = next0;
}
pkts_processed += next0 != NAT66_OUT2IN_NEXT_DROP;
/* 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);
}
vlib_node_increment_counter (vm, nm->out2in_node_index,
NAT66_OUT2IN_ERROR_OUT2IN_PACKETS,
pkts_processed);
return frame->n_vectors;
}
/* *INDENT-OFF* */
VLIB_REGISTER_NODE (nat66_out2in_node) = {
.name = "nat66-out2in",
.vector_size = sizeof (u32),
.format_trace = format_nat66_out2in_trace,
.type = VLIB_NODE_TYPE_INTERNAL,
.n_errors = ARRAY_LEN (nat66_out2in_error_strings),
.error_strings = nat66_out2in_error_strings,
.n_next_nodes = NAT66_OUT2IN_N_NEXT,
/* edit / add dispositions here */
.next_nodes = {
[NAT66_OUT2IN_NEXT_DROP] = "error-drop",
[NAT66_OUT2IN_NEXT_IP6_LOOKUP] = "ip6-lookup",
},
};
/* *INDENT-ON* */
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/
|
