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Vector Packet Processing
inlines.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  * @brief Common NAT inline functions
17  */
18 #ifndef included_nat_inlines_h__
19 #define included_nat_inlines_h__
20 
23 {
24  static const nat_protocol_t lookup_table[256] = {
25  [IP_PROTOCOL_TCP] = NAT_PROTOCOL_TCP,
26  [IP_PROTOCOL_UDP] = NAT_PROTOCOL_UDP,
27  [IP_PROTOCOL_ICMP] = NAT_PROTOCOL_ICMP,
28  [IP_PROTOCOL_ICMP6] = NAT_PROTOCOL_ICMP,
29  };
30 
31  return lookup_table[ip_proto];
32 }
33 
36 {
37  ASSERT (nat_proto <= NAT_PROTOCOL_ICMP);
38 
39  static const u8 lookup_table[256] = {
40  [NAT_PROTOCOL_OTHER] = ~0,
41  [NAT_PROTOCOL_TCP] = IP_PROTOCOL_TCP,
42  [NAT_PROTOCOL_UDP] = IP_PROTOCOL_UDP,
43  [NAT_PROTOCOL_ICMP] = IP_PROTOCOL_ICMP,
44  };
45 
46  ASSERT (NAT_PROTOCOL_OTHER == nat_proto || NAT_PROTOCOL_TCP == nat_proto
47  || NAT_PROTOCOL_UDP == nat_proto || NAT_PROTOCOL_ICMP == nat_proto);
48 
49  return lookup_table[nat_proto];
50 }
51 
54 {
55  switch (icmp_type)
56  {
57  case ICMP4_destination_unreachable:
58  case ICMP4_time_exceeded:
59  case ICMP4_parameter_problem:
60  case ICMP4_source_quench:
61  case ICMP4_redirect:
62  case ICMP4_alternate_host_address:
63  return 1;
64  }
65  return 0;
66 }
67 
68 #endif /* included_nat_inlines_h__ */
69 /*
70  * fd.io coding-style-patch-verification: ON
71  *
72  * Local Variables:
73  * eval: (c-set-style "gnu")
74  * End:
75  */
ip_proto
Definition: ip_types.api:64
nat_protocol_t
Definition: lib.h:41
unsigned char u8
Definition: types.h:56
#define static_always_inline
Definition: clib.h:108
static nat_protocol_t ip_proto_to_nat_proto(u8 ip_proto)
Common NAT inline functions.
Definition: inlines.h:22
static_always_inline u8 icmp_type_is_error_message(u8 icmp_type)
Definition: inlines.h:53
#define always_inline
Definition: ipsec.h:28
#define ASSERT(truth)
static_always_inline u8 nat_proto_to_ip_proto(nat_protocol_t nat_proto)
Definition: inlines.h:35