2 * Copyright (c) 2017 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 #ifndef included_dns_h
17 #define included_dns_h
19 #include <vppinfra/time.h>
20 #include <vppinfra/cache.h>
21 #include <vppinfra/error.h>
23 #include <vppinfra/hash.h>
24 #include <vnet/dns/dns_packet.h>
25 #include <vnet/ip/ip.h>
32 /** The name in "normal human being" notation, e.g. www.foobar.com */
35 /** Expiration time */
38 /** Cached dns request, for sending retries */
41 /** Retry parameters */
47 /** Cached dns response */
50 /** Clients awaiting responses */
51 u32 *api_clients_to_notify;
52 u32 *api_client_contexts;
53 ip4_address_t *ip4_peers_to_notify;
54 ip6_address_t *ip6_peers_to_notify;
57 #define DNS_CACHE_ENTRY_FLAG_VALID (1<<0) /**< we have Actual Data */
58 #define DNS_CACHE_ENTRY_FLAG_STATIC (1<<1) /**< static entry */
60 #define DNS_RETRIES_PER_SERVER 3
62 #define DNS_RESOLVER_EVENT_RESOLVED 1
63 #define DNS_RESOLVER_EVENT_PENDING 2
68 /** Pool of cache entries */
69 dns_cache_entry_t *entries;
71 /** Pool indices of unresolved entries */
72 u32 *unresolved_entries;
74 /** Find cached record by name */
75 uword *cache_entry_by_name;
78 /** enable / disable flag */
81 /** upstream name servers, e.g. 8.8.8.8 */
82 ip4_address_t *ip4_name_servers;
83 ip6_address_t *ip6_name_servers;
85 /** config parameters */
87 u32 max_ttl_in_seconds;
91 vlib_main_t *vlib_main;
92 vnet_main_t *vnet_main;
95 extern dns_main_t dns_main;
97 extern vlib_node_registration_t dns46_reply_node;
98 extern vlib_node_registration_t dns_resolver_node;
100 #define foreach_dns46_reply_error \
101 _(PROCESSED, "DNS reply pkts processed") \
102 _(NO_ELT, "No DNS pool element") \
103 _(FORMAT_ERROR, "DNS format errors") \
104 _(TEST_DROP, "DNS reply pkt dropped for test purposes")
108 #define _(sym,str) DNS46_REPLY_ERROR_##sym,
109 foreach_dns46_reply_error
112 } dns46_reply_error_t;
114 void vnet_send_dns_request (dns_main_t * dm, dns_cache_entry_t * ep);
115 int vnet_dns_cname_indirection_nolock (dns_main_t * dm,
116 dns_cache_entry_t * ep, u8 * reply);
117 int vnet_dns_delete_entry_by_index_nolock (dns_main_t * dm, u32 index);
119 format_function_t format_dns_reply;
122 dns_cache_lock (dns_main_t * dm)
126 while (__sync_lock_test_and_set (dm->cache_lock, 1))
132 dns_cache_unlock (dns_main_t * dm)
136 CLIB_MEMORY_BARRIER ();
141 #endif /* included_dns_h */
144 * fd.io coding-style-patch-verification: ON
147 * eval: (c-set-style "gnu")