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/*
* gre_interface.c: gre interfaces
*
* Copyright (c) 2012 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 <vnet/vnet.h>
#include <vnet/pg/pg.h>
#include <vnet/gre/gre.h>
int
gre_register_interface (vnet_main_t * vnm,
u32 dev_class_index,
ip4_address_t *tunnel_src,
ip4_address_t *tunnel_dst,
u32 outer_fib_id,
u32 * gi_index_return)
{
gre_main_t * gm = &gre_main;
ip4_main_t * im = &ip4_main;
gre_tunnel_t * t;
vnet_hw_interface_t * hi;
u32 hw_if_index;
u32 slot;
u32 outer_fib_index;
uword * p;
u64 key = (u64)tunnel_src->as_u32 << 32 | (u64)tunnel_dst->as_u32;
/* check if same src/dst pair exists */
if (hash_get (gm->tunnel_by_key, key))
return VNET_API_ERROR_INVALID_VALUE;
p = hash_get (im->fib_index_by_table_id, outer_fib_id);
if (! p)
return VNET_API_ERROR_NO_SUCH_FIB;
outer_fib_index = p[0];
pool_get (gm->tunnels, t);
memset (t, 0, sizeof (*t));
hw_if_index = vnet_register_interface
(vnm, gre_device_class.index, t - gm->tunnels,
gre_hw_interface_class.index,
t - gm->tunnels);
*gi_index_return = t - gm->tunnels;
t->hw_if_index = hw_if_index;
t->outer_fib_index = outer_fib_index;
hi = vnet_get_hw_interface (vnm, hw_if_index);
hi->min_packet_bytes = 64 + sizeof (gre_header_t) + sizeof (ip4_header_t);
hi->per_packet_overhead_bytes =
/* preamble */ 8 + /* inter frame gap */ 12;
/* Standard default gre MTU. */
hi->max_l3_packet_bytes[VLIB_RX] = hi->max_l3_packet_bytes[VLIB_TX] = 1500;
memcpy (&t->tunnel_src, tunnel_src, sizeof (t->tunnel_src));
memcpy (&t->tunnel_dst, tunnel_dst, sizeof (t->tunnel_dst));
hash_set (gm->tunnel_by_key, key, t - gm->tunnels);
slot = vlib_node_add_named_next_with_slot
(vnm->vlib_main, hi->tx_node_index, "ip4-lookup", GRE_OUTPUT_NEXT_LOOKUP);
ASSERT (slot == GRE_OUTPUT_NEXT_LOOKUP);
return 0;
}
static clib_error_t *
create_gre_tunnel_command_fn (vlib_main_t * vm,
unformat_input_t * input,
vlib_cli_command_t * cmd)
{
unformat_input_t _line_input, * line_input = &_line_input;
vnet_main_t * vnm = vnet_get_main();
ip4_address_t src, dst;
u32 outer_fib_id = 0;
int rv;
u32 gi_index;
u32 num_m_args = 0;
/* Get a line of input. */
if (! unformat_user (input, unformat_line_input, line_input))
return 0;
while (unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT) {
if (unformat (line_input, "src %U", unformat_ip4_address, &src))
num_m_args++;
else if (unformat (line_input, "dst %U", unformat_ip4_address, &dst))
num_m_args++;
else if (unformat (line_input, "outer-fib-id %d", &outer_fib_id))
;
else
return clib_error_return (0, "unknown input `%U'",
format_unformat_error, input);
}
unformat_free (line_input);
if (num_m_args < 2)
return clib_error_return (0, "mandatory argument(s) missing");
rv = gre_register_interface (vnm, gre_hw_interface_class.index,
&src, &dst, outer_fib_id, &gi_index);
switch(rv)
{
case 0:
break;
case VNET_API_ERROR_INVALID_VALUE:
return clib_error_return (0, "GRE tunnel already exists...");
case VNET_API_ERROR_NO_SUCH_FIB:
return clib_error_return (0, "outer fib ID %d doesn't exist\n",
outer_fib_id);
default:
return clib_error_return (0, "gre_register_interface returned %d", rv);
}
return 0;
}
VLIB_CLI_COMMAND (create_gre_tunnel_command, static) = {
.path = "create gre tunnel",
.short_help = "create gre tunnel src <addr> dst <addr> [outer-fib-id <fib>]",
.function = create_gre_tunnel_command_fn,
};
/* force inclusion from application's main.c */
clib_error_t *gre_interface_init (vlib_main_t *vm)
{
return 0;
}
VLIB_INIT_FUNCTION(gre_interface_init);
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