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
|
/*
* Copyright (c) 2016 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/buffer.h>
#include <vnet/bier/bier_fmask.h>
#include <vnet/bier/bier_hdr_inlines.h>
#include <vlib/vlib.h>
static char * bier_output_error_strings[] = {
#define bier_error(n,s) s,
#include <vnet/bier/bier_output_error.def>
#undef bier_error
};
/*
* Keep these values semantically the same as BIER output
*/
#define foreach_bier_output_next \
_(DROP, "bier-drop")
typedef enum {
#define _(s,n) BIER_OUTPUT_NEXT_##s,
foreach_bier_output_next
#undef _
BIER_OUTPUT_N_NEXT,
} bier_output_next_t;
typedef enum {
#define bier_error(n,s) BIER_OUTPUT_ERROR_##n,
#include <vnet/bier/bier_output_error.def>
#undef bier_error
BIER_OUTPUT_N_ERROR,
} bier_output_error_t;
/**
* Forward declaration
*/
vlib_node_registration_t bier_output_node;
extern vlib_combined_counter_main_t bier_fmask_counters;
/**
* @brief Packet trace record for a BIER output
*/
typedef struct bier_output_trace_t_
{
u32 next_index;
index_t bfm_index;
mpls_label_t bfm_label;
} bier_output_trace_t;
static uword
bier_output (vlib_main_t * vm,
vlib_node_runtime_t * node,
vlib_frame_t * from_frame)
{
vlib_combined_counter_main_t *cm = &bier_fmask_counters;
u32 n_left_from, next_index, * from, * to_next;
u32 thread_index;
thread_index = vm->thread_index;
from = vlib_frame_vector_args (from_frame);
n_left_from = from_frame->n_vectors;
/*
* objection your honour! speculation!
*/
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)
{
bier_output_next_t next0;
bier_bit_string_t bbs;
vlib_buffer_t * b0;
bier_fmask_t *bfm0;
mpls_label_t *h0;
bier_hdr_t *bh0;
u32 bfmi0;
u32 bi0;
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);
bh0 = vlib_buffer_get_current (b0);
bier_bit_string_init_from_hdr(bh0, &bbs);
/*
* In the BIER Lookup node we squirrelled away the
* BIER fmask index as the adj index
*/
bfmi0 = vnet_buffer (b0)->ip.adj_index[VLIB_TX];
bfm0 = bier_fmask_get(bfmi0);
vlib_increment_combined_counter(
cm, thread_index, bfmi0, 1,
vlib_buffer_length_in_chain (vm, b0));
/*
* perform the logical AND of the packet's mask with
* that of the fmask objects, to reset the bits that
* are only on the shortest path the the fmask NH.
*/
bier_bit_string_logical_and_string(
&bfm0->bfm_bits.bfmb_input_reset_string,
&bbs);
/*
* this is the last time we touch the BIER header
* so flip to network order
*/
bier_hdr_hton(bh0);
/*
* paint the BIER peer's label
*/
if (!(bfm0->bfm_flags & BIER_FMASK_FLAG_DISP))
{
/*
* since a BIFT value and a MPLS label are formated the
* same, this painting works OK.
*/
vlib_buffer_advance(b0, -(word)sizeof(mpls_label_t));
h0 = vlib_buffer_get_current(b0);
h0[0] = bfm0->bfm_label;
((char*)h0)[3]= vnet_buffer(b0)->mpls.ttl - 1;
}
/*
* setup next graph node
*/
next0 = bfm0->bfm_dpo.dpoi_next_node;
vnet_buffer(b0)->ip.adj_index[VLIB_TX] = bfm0->bfm_dpo.dpoi_index;
if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED))
{
bier_output_trace_t *tr;
tr = vlib_add_trace (vm, node, b0, sizeof (*tr));
tr->next_index = next0;
tr->bfm_index = bfmi0;
tr->bfm_label = bfm0->bfm_label;
}
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, bier_output_node.index,
BIER_OUTPUT_ERROR_NONE,
from_frame->n_vectors);
return (from_frame->n_vectors);
}
static u8 *
format_bier_output_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 *);
bier_output_trace_t * t = va_arg (*args, bier_output_trace_t *);
s = format (s, " next [%d], BFM index %d label:%x",
t->next_index, t->bfm_index, t->bfm_label);
return s;
}
VLIB_REGISTER_NODE (bier_output_node) = {
.function = bier_output,
.name = "bier-output",
/* Takes a vector of packets. */
.vector_size = sizeof (u32),
.n_errors = BIER_OUTPUT_N_ERROR,
.error_strings = bier_output_error_strings,
.n_next_nodes = BIER_OUTPUT_N_NEXT,
.next_nodes = {
[BIER_OUTPUT_NEXT_DROP] = "bier-drop",
},
.format_trace = format_bier_output_trace,
};
|
