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:
7 * http://www.apache.org/licenses/LICENSE-2.0
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.
16 * @brief Common NAT inline functions
18 #ifndef included_nat_inlines_h__
19 #define included_nat_inlines_h__
21 always_inline nat_protocol_t
22 ip_proto_to_nat_proto (u8 ip_proto)
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,
31 return lookup_table[ip_proto];
34 static_always_inline u8
35 nat_proto_to_ip_proto (nat_protocol_t nat_proto)
37 ASSERT (nat_proto <= NAT_PROTOCOL_ICMP);
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,
46 ASSERT (NAT_PROTOCOL_OTHER == nat_proto || NAT_PROTOCOL_TCP == nat_proto
47 || NAT_PROTOCOL_UDP == nat_proto || NAT_PROTOCOL_ICMP == nat_proto);
49 return lookup_table[nat_proto];
52 static_always_inline u8
53 icmp_type_is_error_message (u8 icmp_type)
57 case ICMP4_destination_unreachable:
58 case ICMP4_time_exceeded:
59 case ICMP4_parameter_problem:
60 case ICMP4_source_quench:
62 case ICMP4_alternate_host_address:
68 #endif /* included_nat_inlines_h__ */
70 * fd.io coding-style-patch-verification: ON
73 * eval: (c-set-style "gnu")