FD.io VPP  v17.01.1-3-gc6833f8
Vector Packet Processing
edit.c
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1 /*
2  * Copyright (c) 2015 Cisco and/or its affiliates.
3  * Licensed under the Apache License, Version 2.0 (the "License");
4  * you may not use this file except in compliance with the License.
5  * You may obtain a copy of the License at:
6  *
7  * http://www.apache.org/licenses/LICENSE-2.0
8  *
9  * Unless required by applicable law or agreed to in writing, software
10  * distributed under the License is distributed on an "AS IS" BASIS,
11  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12  * See the License for the specific language governing permissions and
13  * limitations under the License.
14  */
15 /*
16  * pg_edit.c: packet generator edits
17  *
18  * Copyright (c) 2008 Eliot Dresselhaus
19  *
20  * Permission is hereby granted, free of charge, to any person obtaining
21  * a copy of this software and associated documentation files (the
22  * "Software"), to deal in the Software without restriction, including
23  * without limitation the rights to use, copy, modify, merge, publish,
24  * distribute, sublicense, and/or sell copies of the Software, and to
25  * permit persons to whom the Software is furnished to do so, subject to
26  * the following conditions:
27  *
28  * The above copyright notice and this permission notice shall be
29  * included in all copies or substantial portions of the Software.
30  *
31  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
32  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
33  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
34  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
35  * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
36  * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
37  * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
38  */
39 
40 #include <vlib/vlib.h>
41 #include <vnet/pg/pg.h>
42 
43 static void
44 pg_edit_set_value_helper (pg_edit_t * e, u64 value, u8 * result)
45 {
46  int i, j, n_bits_left;
47  u8 *v, tmp[8];
48 
49  v = tmp;
50 
51  n_bits_left = e->n_bits;
52  i = 0;
53  j = e->lsb_bit_offset % BITS (v[0]);
54 
55  if (n_bits_left > 0 && j != 0)
56  {
57  v[i] = (value & 0xff) << j;
58  value >>= BITS (v[0]) - j;
59  n_bits_left -= BITS (v[0]) - j;
60  i += 1;
61  }
62 
63  while (n_bits_left > 0)
64  {
65  v[i] = value & 0xff;
66  value >>= 8;
67  n_bits_left -= 8;
68  i += 1;
69  }
70 
71  /* Convert to network byte order. */
72  for (j = 0; j < i; j++)
73  result[j] = v[i - 1 - j];
74 }
75 
76 void
77 pg_edit_set_value (pg_edit_t * e, int hi_or_lo, u64 value)
78 {
79  pg_edit_alloc_value (e, hi_or_lo);
80  pg_edit_set_value_helper (e, value, e->values[hi_or_lo]);
81 }
82 
83 /* Parse an int either %d or 0x%x into network byte order. */
84 uword
85 unformat_pg_number (unformat_input_t * input, va_list * args)
86 {
87  u8 *result = va_arg (*args, u8 *);
88  pg_edit_t *e = va_arg (*args, pg_edit_t *);
89  u64 value;
90 
91  ASSERT (BITS (value) >= e->n_bits);
92 
93  if (!unformat (input, "0x%X", sizeof (value), &value)
94  && !unformat (input, "%D", sizeof (value), &value))
95  return 0;
96 
97  /* Number given does not fit into bit field. */
98  if (e->n_bits < 64 && value >= (u64) 1 << (u64) e->n_bits)
99  return 0;
100 
101  pg_edit_set_value_helper (e, value, result);
102  return 1;
103 }
104 
105 uword
106 unformat_pg_edit (unformat_input_t * input, va_list * args)
107 {
108  unformat_function_t *f = va_arg (*args, unformat_function_t *);
109  pg_edit_t *e = va_arg (*args, pg_edit_t *);
110 
112  if (!unformat_user (input, f, e->values[PG_EDIT_LO], e))
113  return 0;
114 
116  if (unformat (input, "-%U", f, e->values[PG_EDIT_HI], e))
117  e->type = PG_EDIT_INCREMENT;
118  else if (unformat (input, "+%U", f, e->values[PG_EDIT_HI], e))
119  e->type = PG_EDIT_RANDOM;
120  else
121  e->type = PG_EDIT_FIXED;
122 
123  return 1;
124 }
125 
126 uword
127 unformat_pg_payload (unformat_input_t * input, va_list * args)
128 {
129  pg_stream_t *s = va_arg (*args, pg_stream_t *);
130  vlib_main_t *vm = vlib_get_main ();
131  pg_edit_t *e;
132  u32 i, node_index, len, max_len;
133  u8 *v;
134 
135  v = 0;
136 
137  if (unformat (input, "incrementing %d", &len))
138  {
139  vec_resize (v, len);
140  for (i = 0; i < len; i++)
141  v[i] = i;
142  }
143  else if (unformat (input, "hex 0x%U", unformat_hex_string, &v))
144  ;
145 
146  else if (unformat (input, "%U", unformat_vlib_node, vm, &node_index))
147  {
148  pg_node_t *pn = pg_get_node (node_index);
149  if (!pn->unformat_edit)
150  return 0;
151  return unformat (input, "%U", pn->unformat_edit, s);
152  }
153 
154  else
155  return 0;
156 
157  /* Length not including this payload. */
158  max_len = pg_edit_group_n_bytes (s, 0);
159  if (max_len + vec_len (v) >= s->max_packet_bytes)
160  {
161  if (s->max_packet_bytes >= max_len)
162  _vec_len (v) = s->max_packet_bytes - max_len;
163  else
164  _vec_len (v) = 0;
165  }
166 
167  e = pg_create_edit_group (s, sizeof (e[0]), vec_len (v), 0);
168 
169  e->type = PG_EDIT_FIXED;
170  e->n_bits = vec_len (v) * BITS (v[0]);
171 
172  /* Least significant bit is at end of bitstream, since everything is always bigendian. */
173  e->lsb_bit_offset = e->n_bits - BITS (v[0]);
174 
175  e->values[PG_EDIT_LO] = v;
176 
177  return 1;
178 }
179 
180 /*
181  * fd.io coding-style-patch-verification: ON
182  *
183  * Local Variables:
184  * eval: (c-set-style "gnu")
185  * End:
186  */
Definition: edit.h:64
#define PG_EDIT_LO
Definition: edit.h:83
sll srl srl sll sra u16x4 i
Definition: vector_sse2.h:343
uword( unformat_function_t)(unformat_input_t *input, va_list *args)
Definition: format.h:231
uword unformat(unformat_input_t *i, char *fmt,...)
Definition: unformat.c:966
static vlib_main_t * vlib_get_main(void)
Definition: global_funcs.h:23
static void pg_edit_alloc_value(pg_edit_t *e, int i)
Definition: edit.h:145
uword unformat_pg_edit(unformat_input_t *input, va_list *args)
Definition: edit.c:106
static pg_node_t * pg_get_node(uword node_index)
Definition: pg.h:350
#define PG_EDIT_HI
Definition: edit.h:84
unformat_function_t unformat_hex_string
Definition: format.h:287
uword unformat_pg_payload(unformat_input_t *input, va_list *args)
Definition: edit.c:127
pg_edit_type_t type
Definition: edit.h:66
unsigned long u64
Definition: types.h:89
i32 lsb_bit_offset
Definition: edit.h:73
#define vec_resize(V, N)
Resize a vector (no header, unspecified alignment) Add N elements to end of given vector V...
Definition: vec.h:201
uword unformat_user(unformat_input_t *input, unformat_function_t *func,...)
Definition: unformat.c:977
static void * pg_create_edit_group(pg_stream_t *s, int n_edit_bytes, int n_packet_bytes, u32 *group_index)
Definition: pg.h:225
static void pg_edit_set_value_helper(pg_edit_t *e, u64 value, u8 *result)
Definition: edit.c:44
void pg_edit_set_value(pg_edit_t *e, int hi_or_lo, u64 value)
Definition: edit.c:77
u8 * values[2]
Definition: edit.h:82
#define v
Definition: acl.c:314
u32 n_bits
Definition: edit.h:79
u32 max_packet_bytes
Definition: pg.h:114
static uword pg_edit_group_n_bytes(pg_stream_t *s, u32 group_index)
Definition: pg.h:267
unformat_function_t * unformat_edit
Definition: pg.h:307
#define ASSERT(truth)
unsigned int u32
Definition: types.h:88
Definition: pg.h:96
u64 uword
Definition: types.h:112
#define vec_len(v)
Number of elements in vector (rvalue-only, NULL tolerant)
unsigned char u8
Definition: types.h:56
unformat_function_t unformat_vlib_node
Definition: node_funcs.h:1110
uword unformat_pg_number(unformat_input_t *input, va_list *args)
Definition: edit.c:85
struct _unformat_input_t unformat_input_t
#define BITS(x)
Definition: clib.h:58
Definition: pg.h:304