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/*
* Copyright (c) 2015 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/ipsec/ipsec.h>
static clib_error_t *
ipsec_call_add_del_callbacks (ipsec_main_t * im, ipsec_sa_t * sa,
u32 sa_index, int is_add)
{
ipsec_ah_backend_t *ab;
ipsec_esp_backend_t *eb;
switch (sa->protocol)
{
case IPSEC_PROTOCOL_AH:
ab = pool_elt_at_index (im->ah_backends, im->ah_current_backend);
if (ab->add_del_sa_sess_cb)
return ab->add_del_sa_sess_cb (sa_index, is_add);
break;
case IPSEC_PROTOCOL_ESP:
eb = pool_elt_at_index (im->esp_backends, im->esp_current_backend);
if (eb->add_del_sa_sess_cb)
return eb->add_del_sa_sess_cb (sa_index, is_add);
break;
}
return 0;
}
int
ipsec_add_del_sa (vlib_main_t * vm, ipsec_sa_t * new_sa, int is_add)
{
ipsec_main_t *im = &ipsec_main;
ipsec_sa_t *sa = 0;
uword *p;
u32 sa_index;
clib_error_t *err;
clib_warning ("id %u spi %u", new_sa->id, new_sa->spi);
p = hash_get (im->sa_index_by_sa_id, new_sa->id);
if (p && is_add)
return VNET_API_ERROR_ENTRY_ALREADY_EXISTS;
if (!p && !is_add)
return VNET_API_ERROR_NO_SUCH_ENTRY;
if (!is_add) /* delete */
{
sa_index = p[0];
sa = pool_elt_at_index (im->sad, sa_index);
if (ipsec_is_sa_used (sa_index))
{
clib_warning ("sa_id %u used in policy", sa->id);
return VNET_API_ERROR_SYSCALL_ERROR_1; /* sa used in policy */
}
hash_unset (im->sa_index_by_sa_id, sa->id);
err = ipsec_call_add_del_callbacks (im, sa, sa_index, 0);
if (err)
return VNET_API_ERROR_SYSCALL_ERROR_1;
pool_put (im->sad, sa);
}
else /* create new SA */
{
pool_get (im->sad, sa);
clib_memcpy (sa, new_sa, sizeof (*sa));
sa_index = sa - im->sad;
hash_set (im->sa_index_by_sa_id, sa->id, sa_index);
err = ipsec_call_add_del_callbacks (im, sa, sa_index, 1);
if (err)
return VNET_API_ERROR_SYSCALL_ERROR_1;
}
return 0;
}
u8
ipsec_is_sa_used (u32 sa_index)
{
ipsec_main_t *im = &ipsec_main;
ipsec_spd_t *spd;
ipsec_policy_t *p;
ipsec_tunnel_if_t *t;
/* *INDENT-OFF* */
pool_foreach(spd, im->spds, ({
pool_foreach(p, spd->policies, ({
if (p->policy == IPSEC_POLICY_ACTION_PROTECT)
{
if (p->sa_index == sa_index)
return 1;
}
}));
}));
pool_foreach(t, im->tunnel_interfaces, ({
if (t->input_sa_index == sa_index)
return 1;
if (t->output_sa_index == sa_index)
return 1;
}));
/* *INDENT-ON* */
return 0;
}
int
ipsec_set_sa_key (vlib_main_t * vm, ipsec_sa_t * sa_update)
{
ipsec_main_t *im = &ipsec_main;
uword *p;
u32 sa_index;
ipsec_sa_t *sa = 0;
clib_error_t *err;
p = hash_get (im->sa_index_by_sa_id, sa_update->id);
if (!p)
return VNET_API_ERROR_SYSCALL_ERROR_1; /* no such sa-id */
sa_index = p[0];
sa = pool_elt_at_index (im->sad, sa_index);
/* new crypto key */
if (0 < sa_update->crypto_key_len)
{
clib_memcpy (sa->crypto_key, sa_update->crypto_key,
sa_update->crypto_key_len);
sa->crypto_key_len = sa_update->crypto_key_len;
}
/* new integ key */
if (0 < sa_update->integ_key_len)
{
clib_memcpy (sa->integ_key, sa_update->integ_key,
sa_update->integ_key_len);
sa->integ_key_len = sa_update->integ_key_len;
}
if (0 < sa_update->crypto_key_len || 0 < sa_update->integ_key_len)
{
err = ipsec_call_add_del_callbacks (im, sa, sa_index, 0);
if (err)
return VNET_API_ERROR_SYSCALL_ERROR_1;
}
return 0;
}
u32
ipsec_get_sa_index_by_sa_id (u32 sa_id)
{
ipsec_main_t *im = &ipsec_main;
uword *p = hash_get (im->sa_index_by_sa_id, sa_id);
if (!p)
return ~0;
return p[0];
}
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/
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