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/*
*------------------------------------------------------------------
* Copyright (c) 2021 Intel 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.
*------------------------------------------------------------------
*/
#ifndef IPSEC_OUTPUT_H
#define IPSEC_OUTPUT_H
#include <vppinfra/types.h>
#include <vnet/ipsec/ipsec_spd.h>
always_inline void
ipsec4_out_spd_add_flow_cache_entry (ipsec_main_t *im, u8 pr, u32 la, u32 ra,
u16 lp, u16 rp, u32 pol_id)
{
u64 hash;
u8 overwrite = 0, stale_overwrite = 0;
ipsec4_spd_5tuple_t ip4_5tuple = { .ip4_addr = { (ip4_address_t) la,
(ip4_address_t) ra },
.port = { lp, rp },
.proto = pr };
ip4_5tuple.kv_16_8.value = (((u64) pol_id) << 32) | ((u64) im->epoch_count);
hash = ipsec4_hash_16_8 (&ip4_5tuple.kv_16_8);
hash &= (im->ipsec4_out_spd_hash_num_buckets - 1);
ipsec_spinlock_lock (&im->ipsec4_out_spd_hash_tbl[hash].bucket_lock);
/* Check if we are overwriting an existing entry so we know
whether to increment the flow cache counter. Since flow
cache counter is reset on any policy add/remove, but
hash table values are not, we also need to check if the entry
we are overwriting is stale or not. If it's a stale entry
overwrite, we still want to increment flow cache counter */
overwrite = (im->ipsec4_out_spd_hash_tbl[hash].value != 0);
/* Check for stale entry by comparing with current epoch count */
if (PREDICT_FALSE (overwrite))
stale_overwrite =
(im->epoch_count !=
((u32) (im->ipsec4_out_spd_hash_tbl[hash].value & 0xFFFFFFFF)));
clib_memcpy_fast (&im->ipsec4_out_spd_hash_tbl[hash], &ip4_5tuple.kv_16_8,
sizeof (ip4_5tuple.kv_16_8));
ipsec_spinlock_unlock (&im->ipsec4_out_spd_hash_tbl[hash].bucket_lock);
/* Increment the counter to track active flow cache entries
when entering a fresh entry or overwriting a stale one */
if (!overwrite || stale_overwrite)
clib_atomic_fetch_add_relax (&im->ipsec4_out_spd_flow_cache_entries, 1);
return;
}
always_inline ipsec_policy_t *
ipsec4_out_spd_find_flow_cache_entry (ipsec_main_t *im, u8 pr, u32 la, u32 ra,
u16 lp, u16 rp)
{
ipsec_policy_t *p = NULL;
ipsec4_hash_kv_16_8_t kv_result;
u64 hash;
if (PREDICT_FALSE ((pr != IP_PROTOCOL_TCP) && (pr != IP_PROTOCOL_UDP) &&
(pr != IP_PROTOCOL_SCTP)))
{
lp = 0;
rp = 0;
}
ipsec4_spd_5tuple_t ip4_5tuple = { .ip4_addr = { (ip4_address_t) la,
(ip4_address_t) ra },
.port = { lp, rp },
.proto = pr };
hash = ipsec4_hash_16_8 (&ip4_5tuple.kv_16_8);
hash &= (im->ipsec4_out_spd_hash_num_buckets - 1);
ipsec_spinlock_lock (&im->ipsec4_out_spd_hash_tbl[hash].bucket_lock);
kv_result = im->ipsec4_out_spd_hash_tbl[hash];
ipsec_spinlock_unlock (&im->ipsec4_out_spd_hash_tbl[hash].bucket_lock);
if (ipsec4_hash_key_compare_16_8 ((u64 *) &ip4_5tuple.kv_16_8,
(u64 *) &kv_result))
{
if (im->epoch_count == ((u32) (kv_result.value & 0xFFFFFFFF)))
{
/* Get the policy based on the index */
p =
pool_elt_at_index (im->policies, ((u32) (kv_result.value >> 32)));
}
}
return p;
}
always_inline ipsec_policy_t *
ipsec_output_policy_match (ipsec_spd_t *spd, u8 pr, u32 la, u32 ra, u16 lp,
u16 rp, u8 flow_cache_enabled)
{
ipsec_main_t *im = &ipsec_main;
ipsec_policy_t *p;
u32 *i;
if (!spd)
return 0;
vec_foreach (i, spd->policies[IPSEC_SPD_POLICY_IP4_OUTBOUND])
{
p = pool_elt_at_index (im->policies, *i);
if (PREDICT_FALSE ((p->protocol != IPSEC_POLICY_PROTOCOL_ANY) &&
(p->protocol != pr)))
continue;
if (ra < clib_net_to_host_u32 (p->raddr.start.ip4.as_u32))
continue;
if (ra > clib_net_to_host_u32 (p->raddr.stop.ip4.as_u32))
continue;
if (la < clib_net_to_host_u32 (p->laddr.start.ip4.as_u32))
continue;
if (la > clib_net_to_host_u32 (p->laddr.stop.ip4.as_u32))
continue;
if (PREDICT_FALSE ((pr != IP_PROTOCOL_TCP) && (pr != IP_PROTOCOL_UDP) &&
(pr != IP_PROTOCOL_SCTP)))
{
lp = 0;
rp = 0;
goto add_flow_cache;
}
if (lp < p->lport.start)
continue;
if (lp > p->lport.stop)
continue;
if (rp < p->rport.start)
continue;
if (rp > p->rport.stop)
continue;
add_flow_cache:
if (flow_cache_enabled)
{
/* Add an Entry in Flow cache */
ipsec4_out_spd_add_flow_cache_entry (
im, pr, clib_host_to_net_u32 (la), clib_host_to_net_u32 (ra),
clib_host_to_net_u16 (lp), clib_host_to_net_u16 (rp), *i);
}
return p;
}
return 0;
}
#endif /* !IPSEC_OUTPUT_H */
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