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
|
/*---------------------------------------------------------------------------
* Copyright (c) 2009-2014 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 "sixrd.h"
vlib_node_registration_t ip4_sixrd_node;
typedef enum {
IP4_SIXRD_NEXT_IP6_LOOKUP,
IP4_SIXRD_NEXT_DROP,
IP4_SIXRD_N_NEXT,
} ip4_sixrd_next_t;
typedef struct {
u32 tunnel_id;
u32 length;
ip4_address_t src;
ip4_address_t dst;
} sixrd_rx_trace_t;
u8 *
format_sixrd_rx_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 *);
sixrd_rx_trace_t *t = va_arg (*args, sixrd_rx_trace_t *);
s = format (s, "6RD: tunnel %d len %d src %U dst %U",
t->tunnel_id, clib_net_to_host_u16 (t->length),
format_ip4_address, &t->src, format_ip4_address, &t->dst);
return s;
}
/*
* ip4_sixrd_sec_check
*/
static_always_inline void
ip4_sixrd_sec_check(sixrd_tunnel_t *t, ip4_address_t sa4,
ip6_address_t sa6, u8 *error) {
if (PREDICT_FALSE(sixrd_get_addr_net(t, sa6.as_u64[0]) != sa4.as_u32))
*error = SIXRD_ERROR_SEC_CHECK;
}
/*
* ip4_sixrd
*/
uword ip4_sixrd(vlib_main_t *vm, vlib_node_runtime_t *node,
vlib_frame_t *frame) {
u32 n_left_from, *from, next_index, *to_next, n_left_to_next;
vlib_node_runtime_t *error_node = vlib_node_get_runtime(vm, ip4_sixrd_node.index);
vnet_interface_main_t * im = &vnet_get_main()->interface_main;
u32 thread_index = vlib_get_thread_index ();
from = vlib_frame_vector_args(frame);
n_left_from = frame->n_vectors;
next_index = node->cached_next_index;
while (n_left_from > 0) {
vlib_get_next_frame(vm, node, next_index, to_next, n_left_to_next);
/* Single loop */
while (n_left_from > 0 && n_left_to_next > 0) {
u32 pi0;
vlib_buffer_t *p0;
u8 error0 = SIXRD_ERROR_NONE;
sixrd_tunnel_t *t0 = 0;
ip4_header_t *ip40;
ip6_header_t *ip60;
u32 tunnel_sw_if_index = ~0;
u32 next0 = IP4_SIXRD_NEXT_DROP;
pi0 = to_next[0] = from[0];
from += 1;
n_left_from -= 1;
to_next += 1;
n_left_to_next -= 1;
p0 = vlib_get_buffer(vm, pi0);
ip40 = vlib_buffer_get_current(p0);
/* Throw away anything that isn't IP in IP. */
if (PREDICT_TRUE(ip40->protocol == IP_PROTOCOL_IPV6 && clib_net_to_host_u16(ip40->length) >= 60)) {
vlib_buffer_advance(p0, sizeof(ip4_header_t));
t0 = ip4_sixrd_get_tunnel(vnet_buffer(p0)->ip.adj_index[VLIB_TX], (ip4_address_t *)&ip40->dst_address, &error0);
} else {
error0 = SIXRD_ERROR_BAD_PROTOCOL;
}
if (!t0) {
error0 = SIXRD_ERROR_NO_TUNNEL;
goto error;
}
tunnel_sw_if_index = t0->sw_if_index;
/* SIXRD inbound security check */
if (t0->security_check) {
ip60 = vlib_buffer_get_current(p0);
ip4_sixrd_sec_check(t0, ip40->src_address, ip60->src_address, &error0);
}
next0 = error0 == SIXRD_ERROR_NONE ? IP4_SIXRD_NEXT_IP6_LOOKUP
: IP4_SIXRD_NEXT_DROP;
if (PREDICT_FALSE(p0->flags & VLIB_BUFFER_IS_TRACED)) {
sixrd_rx_trace_t *tr = vlib_add_trace(vm, node, p0, sizeof(*tr));
tr->tunnel_id = tunnel_sw_if_index;
tr->length = ip40->length;
tr->src.as_u32 = ip40->src_address.as_u32;
tr->dst.as_u32 = ip40->dst_address.as_u32;
}
error:
if (PREDICT_TRUE(error0 == SIXRD_ERROR_NONE)) {
u32 len = vlib_buffer_length_in_chain (vm, p0);
vlib_increment_combined_counter (im->combined_sw_if_counters
+ VNET_INTERFACE_COUNTER_RX,
thread_index,
tunnel_sw_if_index,
1 /* packets */ ,
len /* bytes */ );
vnet_buffer (p0)->sw_if_index[VLIB_RX] = tunnel_sw_if_index;
} else {
p0->error = error_node->errors[error0];
}
vlib_validate_buffer_enqueue_x1(vm, node, next_index, to_next,
n_left_to_next, pi0, next0);
}
vlib_put_next_frame(vm, node, next_index, n_left_to_next);
}
return frame->n_vectors;
}
static char *sixrd_error_strings[] = {
#define _(sym, string) string,
foreach_sixrd_error
#undef _
};
VLIB_REGISTER_NODE(ip4_sixrd_node) = {
.function = ip4_sixrd,
.name = "ip4-sixrd",
.vector_size = sizeof(u32),
.format_trace = format_sixrd_rx_trace,
.n_errors = SIXRD_N_ERROR,
.error_strings = sixrd_error_strings,
.n_next_nodes = IP4_SIXRD_N_NEXT,
.next_nodes =
{
[IP4_SIXRD_NEXT_IP6_LOOKUP] = "ip6-lookup",
[IP4_SIXRD_NEXT_DROP] = "error-drop",
},
};
|
