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
|
/*
* 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.
*/
/*
* pg_edit.c: packet generator edits
*
* Copyright (c) 2008 Eliot Dresselhaus
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#include <vlib/vlib.h>
#include <vnet/pg/pg.h>
static void
pg_edit_set_value_helper (pg_edit_t * e, u64 value, u8 * result)
{
int i, j, n_bits_left;
u8 *v, tmp[8];
v = tmp;
n_bits_left = e->n_bits;
i = 0;
j = e->lsb_bit_offset % BITS (v[0]);
if (n_bits_left > 0 && j != 0)
{
v[i] = (value & 0xff) << j;
value >>= BITS (v[0]) - j;
n_bits_left -= BITS (v[0]) - j;
i += 1;
}
while (n_bits_left > 0)
{
v[i] = value & 0xff;
value >>= 8;
n_bits_left -= 8;
i += 1;
}
/* Convert to network byte order. */
for (j = 0; j < i; j++)
result[j] = v[i - 1 - j];
}
void
pg_edit_set_value (pg_edit_t * e, int hi_or_lo, u64 value)
{
pg_edit_alloc_value (e, hi_or_lo);
pg_edit_set_value_helper (e, value, e->values[hi_or_lo]);
}
/* Parse an int either %d or 0x%x into network byte order. */
uword
unformat_pg_number (unformat_input_t * input, va_list * args)
{
u8 *result = va_arg (*args, u8 *);
pg_edit_t *e = va_arg (*args, pg_edit_t *);
u64 value;
ASSERT (BITS (value) >= e->n_bits);
if (!unformat (input, "0x%X", sizeof (value), &value)
&& !unformat (input, "%D", sizeof (value), &value))
return 0;
/* Number given does not fit into bit field. */
if (e->n_bits < 64 && value >= (u64) 1 << (u64) e->n_bits)
return 0;
pg_edit_set_value_helper (e, value, result);
return 1;
}
uword
unformat_pg_edit (unformat_input_t * input, va_list * args)
{
unformat_function_t *f = va_arg (*args, unformat_function_t *);
pg_edit_t *e = va_arg (*args, pg_edit_t *);
pg_edit_alloc_value (e, PG_EDIT_LO);
if (!unformat_user (input, f, e->values[PG_EDIT_LO], e))
return 0;
pg_edit_alloc_value (e, PG_EDIT_HI);
if (unformat (input, "-%U", f, e->values[PG_EDIT_HI], e))
e->type = PG_EDIT_INCREMENT;
else if (unformat (input, "+%U", f, e->values[PG_EDIT_HI], e))
e->type = PG_EDIT_RANDOM;
else
e->type = PG_EDIT_FIXED;
return 1;
}
uword
unformat_pg_payload (unformat_input_t * input, va_list * args)
{
pg_stream_t *s = va_arg (*args, pg_stream_t *);
vlib_main_t *vm = vlib_get_main ();
pg_edit_t *e;
u32 i, node_index, len, max_len, ilen;
u8 *v;
v = 0;
if (unformat (input, "incrementing %d", &ilen))
;
else if (unformat (input, "hex 0x%U", unformat_hex_string, &v))
;
else if (unformat (input, "%U", unformat_vlib_node, vm, &node_index))
{
pg_node_t *pn = pg_get_node (node_index);
if (!pn->unformat_edit)
return 0;
return unformat (input, "%U", pn->unformat_edit, s);
}
else
return 0;
/* Length not including this payload. */
max_len = pg_edit_group_n_bytes (s, 0);
if (max_len >= s->max_packet_bytes)
{
/* no payload */
len = 0;
}
else
{
/* make a bigger v to hold the data */
len = s->max_packet_bytes - max_len;
}
vec_resize (v, len);
for (i = 0; i < len; i++)
v[i] = i % ilen;
e = pg_create_edit_group (s, sizeof (e[0]), 0, 0);
e->type = PG_EDIT_FIXED;
e->n_bits = vec_len (v) * BITS (v[0]);
/* Least significant bit is at end of bitstream, since everything is always bigendian. */
e->lsb_bit_offset = e->n_bits - BITS (v[0]);
e->values[PG_EDIT_LO] = v;
return 1;
}
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/
|
