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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>
/**
* @brief
* Policy packet & bytes counters
*/
vlib_combined_counter_main_t ipsec_spd_policy_counters = {
.name = "policy",
.stat_segment_name = "/net/ipsec/policy",
};
static int
ipsec_policy_is_equal (ipsec_policy_t * p1, ipsec_policy_t * p2)
{
if (p1->priority != p2->priority)
return 0;
if (p1->type != p2->type)
return (0);
if (p1->policy != p2->policy)
return (0);
if (p1->sa_id != p2->sa_id)
return (0);
if (p1->protocol != p2->protocol)
return (0);
if (p1->lport.start != p2->lport.start)
return (0);
if (p1->lport.stop != p2->lport.stop)
return (0);
if (p1->rport.start != p2->rport.start)
return (0);
if (p1->rport.stop != p2->rport.stop)
return (0);
if (p1->is_ipv6 != p2->is_ipv6)
return (0);
if (p2->is_ipv6)
{
if (p1->laddr.start.ip6.as_u64[0] != p2->laddr.start.ip6.as_u64[0])
return (0);
if (p1->laddr.start.ip6.as_u64[1] != p2->laddr.start.ip6.as_u64[1])
return (0);
if (p1->laddr.stop.ip6.as_u64[0] != p2->laddr.stop.ip6.as_u64[0])
return (0);
if (p1->laddr.stop.ip6.as_u64[1] != p2->laddr.stop.ip6.as_u64[1])
return (0);
if (p1->raddr.start.ip6.as_u64[0] != p2->raddr.start.ip6.as_u64[0])
return (0);
if (p1->raddr.start.ip6.as_u64[1] != p2->raddr.start.ip6.as_u64[1])
return (0);
if (p1->raddr.stop.ip6.as_u64[0] != p2->raddr.stop.ip6.as_u64[0])
return (0);
if (p1->laddr.stop.ip6.as_u64[1] != p2->laddr.stop.ip6.as_u64[1])
return (0);
}
else
{
if (p1->laddr.start.ip4.as_u32 != p2->laddr.start.ip4.as_u32)
return (0);
if (p1->laddr.stop.ip4.as_u32 != p2->laddr.stop.ip4.as_u32)
return (0);
if (p1->raddr.start.ip4.as_u32 != p2->raddr.start.ip4.as_u32)
return (0);
if (p1->raddr.stop.ip4.as_u32 != p2->raddr.stop.ip4.as_u32)
return (0);
}
return (1);
}
static int
ipsec_spd_entry_sort (void *a1, void *a2)
{
ipsec_main_t *im = &ipsec_main;
u32 *id1 = a1;
u32 *id2 = a2;
ipsec_policy_t *p1, *p2;
p1 = pool_elt_at_index (im->policies, *id1);
p2 = pool_elt_at_index (im->policies, *id2);
if (p1 && p2)
return p2->priority - p1->priority;
return 0;
}
int
ipsec_policy_mk_type (bool is_outbound,
bool is_ipv6,
ipsec_policy_action_t action,
ipsec_spd_policy_type_t * type)
{
if (is_outbound)
{
*type = (is_ipv6 ?
IPSEC_SPD_POLICY_IP6_OUTBOUND : IPSEC_SPD_POLICY_IP4_OUTBOUND);
return (0);
}
else
{
switch (action)
{
case IPSEC_POLICY_ACTION_PROTECT:
*type = (is_ipv6 ?
IPSEC_SPD_POLICY_IP6_INBOUND_PROTECT :
IPSEC_SPD_POLICY_IP4_INBOUND_PROTECT);
return (0);
case IPSEC_POLICY_ACTION_BYPASS:
*type = (is_ipv6 ?
IPSEC_SPD_POLICY_IP6_INBOUND_BYPASS :
IPSEC_SPD_POLICY_IP4_INBOUND_BYPASS);
return (0);
case IPSEC_POLICY_ACTION_DISCARD:
*type = (is_ipv6 ?
IPSEC_SPD_POLICY_IP6_INBOUND_DISCARD :
IPSEC_SPD_POLICY_IP4_INBOUND_DISCARD);
return (0);
case IPSEC_POLICY_ACTION_RESOLVE:
break;
}
}
/* Unsupported type */
return (-1);
}
int
ipsec_add_del_policy (vlib_main_t * vm,
ipsec_policy_t * policy, int is_add, u32 * stat_index)
{
ipsec_main_t *im = &ipsec_main;
ipsec_spd_t *spd = 0;
ipsec_policy_t *vp;
u32 spd_index;
uword *p;
p = hash_get (im->spd_index_by_spd_id, policy->id);
if (!p)
return VNET_API_ERROR_SYSCALL_ERROR_1;
spd_index = p[0];
spd = pool_elt_at_index (im->spds, spd_index);
if (!spd)
return VNET_API_ERROR_SYSCALL_ERROR_1;
if (im->output_flow_cache_flag && !policy->is_ipv6 &&
policy->type == IPSEC_SPD_POLICY_IP4_OUTBOUND)
{
/*
* Flow cache entry is valid only when epoch_count value in control
* plane and data plane match. Otherwise, flow cache entry is considered
* stale. To avoid the race condition of using old epoch_count value
* in data plane after the roll over of epoch_count in control plane,
* entire flow cache is reset.
*/
if (im->epoch_count == 0xFFFFFFFF)
{
/* Reset all the entries in flow cache */
clib_memset_u8 (im->ipsec4_out_spd_hash_tbl, 0,
im->ipsec4_out_spd_hash_num_buckets *
(sizeof (*(im->ipsec4_out_spd_hash_tbl))));
}
/* Increment epoch counter by 1 */
clib_atomic_fetch_add_relax (&im->epoch_count, 1);
/* Reset spd flow cache counter since all old entries are stale */
clib_atomic_store_relax_n (&im->ipsec4_out_spd_flow_cache_entries, 0);
}
if ((policy->type == IPSEC_SPD_POLICY_IP4_INBOUND_PROTECT ||
policy->type == IPSEC_SPD_POLICY_IP4_INBOUND_BYPASS ||
policy->type == IPSEC_SPD_POLICY_IP4_INBOUND_DISCARD) &&
im->input_flow_cache_flag && !policy->is_ipv6)
{
/*
* Flow cache entry is valid only when input_epoch_count value in control
* plane and data plane match. Otherwise, flow cache entry is considered
* stale. To avoid the race condition of using old input_epoch_count
* value in data plane after the roll over of input_epoch_count in
* control plane, entire flow cache is reset.
*/
if (im->input_epoch_count == 0xFFFFFFFF)
{
/* Reset all the entries in flow cache */
clib_memset_u8 (im->ipsec4_in_spd_hash_tbl, 0,
im->ipsec4_in_spd_hash_num_buckets *
(sizeof (*(im->ipsec4_in_spd_hash_tbl))));
}
/* Increment epoch counter by 1 */
clib_atomic_fetch_add_relax (&im->input_epoch_count, 1);
/* Reset spd flow cache counter since all old entries are stale */
im->ipsec4_in_spd_flow_cache_entries = 0;
}
if (is_add)
{
u32 policy_index;
if (policy->policy == IPSEC_POLICY_ACTION_PROTECT)
{
index_t sa_index = ipsec_sa_find_and_lock (policy->sa_id);
if (INDEX_INVALID == sa_index)
return VNET_API_ERROR_SYSCALL_ERROR_1;
policy->sa_index = sa_index;
}
else
policy->sa_index = INDEX_INVALID;
pool_get (im->policies, vp);
clib_memcpy (vp, policy, sizeof (*vp));
policy_index = vp - im->policies;
vlib_validate_combined_counter (&ipsec_spd_policy_counters,
policy_index);
vlib_zero_combined_counter (&ipsec_spd_policy_counters, policy_index);
vec_add1 (spd->policies[policy->type], policy_index);
vec_sort_with_function (spd->policies[policy->type],
ipsec_spd_entry_sort);
*stat_index = policy_index;
}
else
{
u32 ii;
vec_foreach_index (ii, (spd->policies[policy->type]))
{
vp = pool_elt_at_index (im->policies,
spd->policies[policy->type][ii]);
if (ipsec_policy_is_equal (vp, policy))
{
vec_delete (spd->policies[policy->type], 1, ii);
ipsec_sa_unlock (vp->sa_index);
pool_put (im->policies, vp);
break;
}
}
}
return 0;
}
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/
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