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/*
* pg.c: packet generator for L2TPv3 header
*
* Copyright (c) 2013 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 <vlib/vlib.h>
#include <vnet/pg/pg.h>
#include <vnet/l2tp/l2tp.h>
typedef struct {
pg_edit_t session_id;
pg_edit_t cookie;
} pg_l2tp_header_t;
typedef struct {
pg_edit_t l2_sublayer;
} pg_l2tp_header_l2_sublayer_t;
static inline void
pg_l2tp_header_init (pg_l2tp_header_t * e)
{
pg_edit_init (&e->session_id, l2tpv3_header_t, session_id);
pg_edit_init (&e->cookie, l2tpv3_header_t, cookie);
}
uword
unformat_pg_l2tp_header (unformat_input_t * input, va_list * args)
{
pg_stream_t * s = va_arg (*args, pg_stream_t *);
pg_l2tp_header_t * h;
u32 group_index, error;
vlib_main_t * vm = vlib_get_main();
h = pg_create_edit_group (s, sizeof (h[0]),
sizeof (l2tpv3_header_t) - sizeof(u32),
&group_index);
pg_l2tp_header_init (h);
error = 1;
// session id and cookie are required
if (! unformat (input, "L2TP: session_id %U cookie %U",
unformat_pg_edit, unformat_pg_number, &h->session_id,
unformat_pg_edit, unformat_pg_number, &h->cookie)) {
goto done;
}
// "l2_sublayer <value>" is optional
if (unformat (input, "l2_sublayer")) {
pg_l2tp_header_l2_sublayer_t * h2;
h2 = pg_add_edits (s, sizeof (h2[0]), sizeof(u32), group_index);
pg_edit_init (&h2->l2_sublayer, l2tpv3_header_t, l2_specific_sublayer);
if (! unformat_user (input, unformat_pg_edit,
unformat_pg_number, &h2->l2_sublayer)) {
goto done;
}
}
// Parse an ethernet header if it is present
{
pg_node_t * pg_node = 0;
vlib_node_t * eth_lookup_node;
eth_lookup_node = vlib_get_node_by_name (vm, (u8 *)"ethernet-input");
ASSERT (eth_lookup_node);
pg_node = pg_get_node (eth_lookup_node->index);
if (pg_node && pg_node->unformat_edit
&& unformat_user (input, pg_node->unformat_edit, s))
;
}
error = 0;
done:
if (error)
pg_free_edit_group (s);
return error == 0;
}
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