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/*
* Copyright (c) 2020 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.
*/
#ifndef __CNAT_SNAT_H__
#define __CNAT_SNAT_H__
#include <cnat/cnat_types.h>
always_inline int
cnat_search_snat_prefix (ip46_address_t * addr, ip_address_family_t af)
{
/* Returns 0 if addr matches any of the listed prefixes */
cnat_snat_pfx_table_t *table = &cnat_main.snat_pfx_table;
clib_bihash_kv_24_8_t kv, val;
int i, n_p, rv;
n_p = vec_len (table->meta[af].prefix_lengths_in_search_order);
if (AF_IP4 == af)
{
kv.key[0] = addr->ip4.as_u32;
kv.key[1] = 0;
}
else
{
kv.key[0] = addr->as_u64[0];
kv.key[1] = addr->as_u64[1];
}
/*
* start search from a mask length same length or shorter.
* we don't want matches longer than the mask passed
*/
i = 0;
for (; i < n_p; i++)
{
int dst_address_length =
table->meta[af].prefix_lengths_in_search_order[i];
ip6_address_t *mask = &table->ip_masks[dst_address_length];
ASSERT (dst_address_length >= 0 && dst_address_length <= 128);
/* As lengths are decreasing, masks are increasingly specific. */
kv.key[0] &= mask->as_u64[0];
kv.key[1] &= mask->as_u64[1];
kv.key[2] = ((u64) af << 32) | dst_address_length;
rv = clib_bihash_search_inline_2_24_8 (&table->ip_hash, &kv, &val);
if (rv == 0)
return 0;
}
return -1;
}
extern int cnat_add_snat_prefix (ip_prefix_t * pfx);
extern int cnat_del_snat_prefix (ip_prefix_t * pfx);
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/
#endif
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