FD.io VPP  v16.09
Vector Packet Processing
pg.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  * snap_pg.c: packet generator snap interface
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 #include <vnet/snap/snap.h>
43 
44 typedef struct {
48 
49 static inline void
51 {
52  pg_edit_init (&e->oui, snap_header_t, oui);
53  pg_edit_init (&e->protocol, snap_header_t, protocol);
54 }
55 
56 uword
57 unformat_pg_snap_header (unformat_input_t * input, va_list * args)
58 {
59  pg_stream_t * s = va_arg (*args, pg_stream_t *);
60  pg_snap_header_t * h;
61  u32 group_index, error;
62 
63  h = pg_create_edit_group (s, sizeof (h[0]), sizeof (snap_header_t),
64  &group_index);
66 
67  error = 1;
68  if (! unformat (input, "%U -> %U",
71  goto done;
72 
73  {
74  snap_main_t * pm = &snap_main;
75  snap_protocol_info_t * pi = 0;
76  pg_node_t * pg_node = 0;
77 
78  if (h->oui.type == PG_EDIT_FIXED
79  && h->protocol.type == PG_EDIT_FIXED)
80  {
81  u8 * o = h->oui.values[PG_EDIT_LO];
82  u8 * p = h->protocol.values[PG_EDIT_LO];
83  snap_header_t h;
84 
85  h.oui[0] = o[0];
86  h.oui[1] = o[1];
87  h.oui[2] = o[2];
88  h.protocol = *(u16 *) p;
89  pi = snap_get_protocol_info (pm, &h);
90  if (pi && pi->node_index != ~0)
91  pg_node = pg_get_node (pi->node_index);
92  }
93 
94  if (pg_node && pg_node->unformat_edit
95  && unformat_user (input, pg_node->unformat_edit, s))
96  ;
97 
98  else if (! unformat_user (input, unformat_pg_payload, s))
99  goto done;
100  }
101 
102  error = 0;
103  done:
104  if (error)
105  pg_free_edit_group (s);
106  return error == 0;
107 }
108 
pg_edit_t protocol
Definition: pg.c:46
Definition: edit.h:63
#define PG_EDIT_LO
Definition: edit.h:81
uword unformat(unformat_input_t *i, char *fmt,...)
Definition: unformat.c:966
static void pg_snap_header_init(pg_snap_header_t *e)
Definition: pg.c:50
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:343
pg_edit_t oui
Definition: pg.c:45
uword unformat_pg_payload(unformat_input_t *input, va_list *args)
Definition: edit.c:127
pg_edit_type_t type
Definition: edit.h:64
uword unformat_user(unformat_input_t *input, unformat_function_t *func,...)
Definition: unformat.c:977
#define pg_edit_init(e, type, field)
Definition: edit.h:114
static void * pg_create_edit_group(pg_stream_t *s, int n_edit_bytes, int n_packet_bytes, u32 *group_index)
Definition: pg.h:220
unformat_function_t unformat_snap_protocol
Definition: snap.h:179
u8 * values[2]
Definition: edit.h:80
static snap_protocol_info_t * snap_get_protocol_info(snap_main_t *sm, snap_header_t *h)
Definition: snap.h:147
unformat_function_t * unformat_edit
Definition: pg.h:299
unsigned int u32
Definition: types.h:88
snap_main_t snap_main
Definition: snap.c:45
static void pg_free_edit_group(pg_stream_t *s)
Definition: pg.h:275
Definition: pg.h:95
u64 uword
Definition: types.h:112
unsigned short u16
Definition: types.h:57
unsigned char u8
Definition: types.h:56
struct _unformat_input_t unformat_input_t
uword unformat_pg_snap_header(unformat_input_t *input, va_list *args)
Definition: pg.c:57
Definition: pg.h:297