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Vector Packet Processing
cnat_snat.h
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1 /*
2  * Copyright (c) 2020 Cisco and/or its affiliates.
3  * Licensed under the Apache License, Version 2.0 (the "License");
4  * you may not use this file except in compliance with the License.
5  * You may obtain a copy of the License at:
6  *
7  * http://www.apache.org/licenses/LICENSE-2.0
8  *
9  * Unless required by applicable law or agreed to in writing, software
10  * distributed under the License is distributed on an "AS IS" BASIS,
11  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12  * See the License for the specific language governing permissions and
13  * limitations under the License.
14  */
15 
16 #ifndef __CNAT_SNAT_H__
17 #define __CNAT_SNAT_H__
18 
19 #include <cnat/cnat_types.h>
20 
21 always_inline int
23 {
24  /* Returns 0 if addr matches any of the listed prefixes */
26  clib_bihash_kv_24_8_t kv, val;
27  int i, n_p, rv;
28  n_p = vec_len (table->meta[af].prefix_lengths_in_search_order);
29  if (AF_IP4 == af)
30  {
31  kv.key[0] = addr->ip4.as_u32;
32  kv.key[1] = 0;
33  }
34  else
35  {
36  kv.key[0] = addr->as_u64[0];
37  kv.key[1] = addr->as_u64[1];
38  }
39 
40  /*
41  * start search from a mask length same length or shorter.
42  * we don't want matches longer than the mask passed
43  */
44  i = 0;
45  for (; i < n_p; i++)
46  {
47  int dst_address_length =
49  ip6_address_t *mask = &table->ip_masks[dst_address_length];
50 
51  ASSERT (dst_address_length >= 0 && dst_address_length <= 128);
52  /* As lengths are decreasing, masks are increasingly specific. */
53  kv.key[0] &= mask->as_u64[0];
54  kv.key[1] &= mask->as_u64[1];
55  kv.key[2] = ((u64) af << 32) | dst_address_length;
56  rv = clib_bihash_search_inline_2_24_8 (&table->ip_hash, &kv, &val);
57  if (rv == 0)
58  return 0;
59  }
60  return -1;
61 }
62 
63 extern int cnat_add_snat_prefix (ip_prefix_t * pfx);
64 extern int cnat_del_snat_prefix (ip_prefix_t * pfx);
65 
66 /*
67  * fd.io coding-style-patch-verification: ON
68  *
69  * Local Variables:
70  * eval: (c-set-style "gnu")
71  * End:
72  */
73 
74 #endif
int cnat_add_snat_prefix(ip_prefix_t *pfx)
Definition: cnat_snat.c:36
unsigned long u64
Definition: types.h:89
u16 mask
Definition: flow_types.api:52
vhost_vring_addr_t addr
Definition: vhost_user.h:111
clib_bihash_24_8_t ip_hash
Definition: cnat_types.h:76
int cnat_del_snat_prefix(ip_prefix_t *pfx)
Definition: cnat_snat.c:67
static int cnat_search_snat_prefix(ip46_address_t *addr, ip_address_family_t af)
Definition: cnat_snat.h:22
#define always_inline
Definition: ipsec.h:28
sll srl srl sll sra u16x4 i
Definition: vector_sse42.h:317
#define ASSERT(truth)
cnat_snat_pfx_table_t snat_pfx_table
Definition: cnat_types.h:129
enum ip_address_family_t_ ip_address_family_t
ip6_address_t ip_masks[129]
Definition: cnat_types.h:80
#define vec_len(v)
Number of elements in vector (rvalue-only, NULL tolerant)
cnat_main_t cnat_main
Definition: cnat_types.c:18
cnat_snat_pfx_table_meta_t meta[2]
Definition: cnat_types.h:78