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Vector Packet Processing
pg.c
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1 /*
2  * pg.c: packet generator for L2TPv3 header
3  *
4  * Copyright (c) 2013 Cisco and/or its affiliates.
5  * Licensed under the Apache License, Version 2.0 (the "License");
6  * you may not use this file except in compliance with the License.
7  * You may obtain a copy of the License at:
8  *
9  * http://www.apache.org/licenses/LICENSE-2.0
10  *
11  * Unless required by applicable law or agreed to in writing, software
12  * distributed under the License is distributed on an "AS IS" BASIS,
13  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14  * See the License for the specific language governing permissions and
15  * limitations under the License.
16  */
17 
18 #include <vlib/vlib.h>
19 #include <vnet/pg/pg.h>
20 #include <vnet/l2tp/l2tp.h>
21 
22 typedef struct {
26 
27 typedef struct {
30 
31 static inline void
33 {
34  pg_edit_init (&e->session_id, l2tpv3_header_t, session_id);
35  pg_edit_init (&e->cookie, l2tpv3_header_t, cookie);
36 }
37 
38 uword
39 unformat_pg_l2tp_header (unformat_input_t * input, va_list * args)
40 {
41  pg_stream_t * s = va_arg (*args, pg_stream_t *);
42  pg_l2tp_header_t * h;
43  u32 group_index, error;
44  vlib_main_t * vm = vlib_get_main();
45 
46  h = pg_create_edit_group (s, sizeof (h[0]),
47  sizeof (l2tpv3_header_t) - sizeof(u32),
48  &group_index);
50 
51  error = 1;
52 
53  // session id and cookie are required
54  if (! unformat (input, "L2TP: session_id %U cookie %U",
57  goto done;
58  }
59 
60  // "l2_sublayer <value>" is optional
61  if (unformat (input, "l2_sublayer")) {
63 
64  h2 = pg_add_edits (s, sizeof (h2[0]), sizeof(u32), group_index);
65  pg_edit_init (&h2->l2_sublayer, l2tpv3_header_t, l2_specific_sublayer);
66  if (! unformat_user (input, unformat_pg_edit,
68  goto done;
69  }
70  }
71 
72  // Parse an ethernet header if it is present
73  {
74  pg_node_t * pg_node = 0;
75  vlib_node_t * eth_lookup_node;
76 
77  eth_lookup_node = vlib_get_node_by_name (vm, (u8 *)"ethernet-input");
78  ASSERT (eth_lookup_node);
79 
80  pg_node = pg_get_node (eth_lookup_node->index);
81 
82  if (pg_node && pg_node->unformat_edit
83  && unformat_user (input, pg_node->unformat_edit, s))
84  ;
85  }
86 
87  error = 0;
88 
89 done:
90  if (error)
92  return error == 0;
93 }
94 
static void pg_l2tp_header_init(pg_l2tp_header_t *e)
Definition: pg.c:32
Definition: edit.h:63
uword unformat(unformat_input_t *i, char *fmt,...)
Definition: unformat.c:942
always_inline pg_node_t * pg_get_node(uword node_index)
Definition: pg.h:335
u32 index
Definition: node.h:203
uword unformat_pg_edit(unformat_input_t *input, va_list *args)
Definition: edit.c:106
pg_edit_t session_id
Definition: pg.c:23
always_inline vlib_main_t * vlib_get_main(void)
Definition: global_funcs.h:23
uword unformat_user(unformat_input_t *input, unformat_function_t *func,...)
Definition: unformat.c:953
#define pg_edit_init(e, type, field)
Definition: edit.h:114
pg_edit_t l2_sublayer
Definition: pg.c:28
uword unformat_pg_l2tp_header(unformat_input_t *input, va_list *args)
Definition: pg.c:39
pg_edit_t cookie
Definition: pg.c:24
always_inline void * pg_create_edit_group(pg_stream_t *s, int n_edit_bytes, int n_packet_bytes, u32 *group_index)
Definition: pg.h:214
unformat_function_t * unformat_edit
Definition: pg.h:290
#define ASSERT(truth)
unsigned int u32
Definition: types.h:88
always_inline void * pg_add_edits(pg_stream_t *s, int n_edit_bytes, int n_packet_bytes, u32 group_index)
Definition: pg.h:236
Definition: pg.h:91
u64 uword
Definition: types.h:112
vlib_node_t * vlib_get_node_by_name(vlib_main_t *vm, u8 *name)
Definition: node.c:44
unsigned char u8
Definition: types.h:56
uword unformat_pg_number(unformat_input_t *input, va_list *args)
Definition: edit.c:84
struct _unformat_input_t unformat_input_t
always_inline void pg_free_edit_group(pg_stream_t *s)
Definition: pg.h:269
Definition: pg.h:288