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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>
#include <vnet/ip/format.h>
u8 * format_gre_tunnel (u8 * s, va_list * args)
{
gre_tunnel_t * t = va_arg (*args, gre_tunnel_t *);
gre_main_t * gm = &gre_main;
s = format (s,
"[%d] %U (src) %U (dst) outer_fib_index %d",
t - gm->tunnels,
format_ip4_address, &t->tunnel_src,
format_ip4_address, &t->tunnel_dst,
t->outer_fib_index);
return s;
}
int vnet_gre_add_del_tunnel
(vnet_gre_add_del_tunnel_args_t *a, u32 * sw_if_indexp)
{
gre_main_t * gm = &gre_main;
vnet_main_t * vnm = gm->vnet_main;
ip4_main_t * im = &ip4_main;
gre_tunnel_t * t;
vnet_hw_interface_t * hi;
u32 hw_if_index, sw_if_index;
u32 slot;
u32 outer_fib_index;
uword * p;
u64 key;
key = (u64)a->src.as_u32 << 32 | (u64)a->dst.as_u32;
p = hash_get (gm->tunnel_by_key, key);
if (a->is_add) {
/* check if same src/dst pair exists */
if (p)
return VNET_API_ERROR_INVALID_VALUE;
p = hash_get (im->fib_index_by_table_id, a->outer_table_id);
if (! p)
return VNET_API_ERROR_NO_SUCH_FIB;
outer_fib_index = p[0];
pool_get_aligned (gm->tunnels, t, CLIB_CACHE_LINE_BYTES);
memset (t, 0, sizeof (*t));
if (vec_len (gm->free_gre_tunnel_hw_if_indices) > 0) {
vnet_interface_main_t * im = &vnm->interface_main;
hw_if_index = gm->free_gre_tunnel_hw_if_indices
[vec_len (gm->free_gre_tunnel_hw_if_indices)-1];
_vec_len (gm->free_gre_tunnel_hw_if_indices) -= 1;
hi = vnet_get_hw_interface (vnm, hw_if_index);
hi->dev_instance = t - gm->tunnels;
hi->hw_instance = hi->dev_instance;
/* clear old stats of freed tunnel before reuse */
sw_if_index = hi->sw_if_index;
vnet_interface_counter_lock(im);
vlib_zero_combined_counter
(&im->combined_sw_if_counters[VNET_INTERFACE_COUNTER_TX], sw_if_index);
vlib_zero_combined_counter
(&im->combined_sw_if_counters[VNET_INTERFACE_COUNTER_RX], sw_if_index);
vlib_zero_simple_counter
(&im->sw_if_counters[VNET_INTERFACE_COUNTER_DROP], sw_if_index);
vnet_interface_counter_unlock(im);
} else {
hw_if_index = vnet_register_interface
(vnm, gre_device_class.index, t - gm->tunnels,
gre_hw_interface_class.index,
t - gm->tunnels);
hi = vnet_get_hw_interface (vnm, hw_if_index);
sw_if_index = hi->sw_if_index;
}
t->hw_if_index = hw_if_index;
t->outer_fib_index = outer_fib_index;
t->sw_if_index = sw_if_index;
vec_validate_init_empty (gm->tunnel_index_by_sw_if_index, sw_if_index, ~0);
gm->tunnel_index_by_sw_if_index[sw_if_index] = t - gm->tunnels;
vec_validate (im->fib_index_by_sw_if_index, sw_if_index);
im->fib_index_by_sw_if_index[sw_if_index] = t->outer_fib_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] = 9000;
clib_memcpy (&t->tunnel_src, &a->src, sizeof (t->tunnel_src));
clib_memcpy (&t->tunnel_dst, &a->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);
} else { /* !is_add => delete */
/* tunnel needs to exist */
if (! p)
return VNET_API_ERROR_NO_SUCH_ENTRY;
t = pool_elt_at_index (gm->tunnels, p[0]);
sw_if_index = t->sw_if_index;
vnet_sw_interface_set_flags (vnm, sw_if_index, 0 /* down */);
/* make sure tunnel is removed from l2 bd or xconnect */
set_int_l2_mode(gm->vlib_main, vnm, MODE_L3, sw_if_index, 0, 0, 0, 0);
vec_add1 (gm->free_gre_tunnel_hw_if_indices, t->hw_if_index);
gm->tunnel_index_by_sw_if_index[sw_if_index] = ~0;
hash_unset (gm->tunnel_by_key, key);
pool_put (gm->tunnels, t);
}
if (sw_if_indexp)
*sw_if_indexp = sw_if_index;
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_gre_add_del_tunnel_args_t _a, * a = &_a;
ip4_address_t src, dst;
u32 outer_fib_id = 0;
int rv;
u32 num_m_args = 0;
u8 is_add = 1;
u32 sw_if_index;
/* 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, "del"))
is_add = 0;
else 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");
if (memcmp (&src, &dst, sizeof(src)) == 0)
return clib_error_return (0, "src and dst are identical");
memset (a, 0, sizeof (*a));
a->is_add = is_add;
a->outer_table_id = outer_fib_id;
clib_memcpy(&a->src, &src, sizeof(src));
clib_memcpy(&a->dst, &dst, sizeof(dst));
rv = vnet_gre_add_del_tunnel (a, &sw_if_index);
switch(rv)
{
case 0:
vlib_cli_output(vm, "%U\n", format_vnet_sw_if_index_name, vnet_get_main(), sw_if_index);
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, "vnet_gre_add_del_tunnel 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>] [del]",
.function = create_gre_tunnel_command_fn,
};
static clib_error_t *
show_gre_tunnel_command_fn (vlib_main_t * vm,
unformat_input_t * input,
vlib_cli_command_t * cmd)
{
gre_main_t * gm = &gre_main;
gre_tunnel_t * t;
if (pool_elts (gm->tunnels) == 0)
vlib_cli_output (vm, "No GRE tunnels configured...");
pool_foreach (t, gm->tunnels,
({
vlib_cli_output (vm, "%U", format_gre_tunnel, t);
}));
return 0;
}
VLIB_CLI_COMMAND (show_gre_tunnel_command, static) = {
.path = "show gre tunnel",
.function = show_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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