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>
26 #include <vppinfra/lock.h>
39 } dns_pending_request_t;
43 DNS_API_PENDING_NAME_TO_IP = 1,
44 DNS_API_PENDING_IP_TO_NAME,
45 DNS_PEER_PENDING_NAME_TO_IP,
46 DNS_PEER_PENDING_IP_TO_NAME,
47 } dns_pending_request_type_t;
54 /** The name in "normal human being" notation, e.g. www.foobar.com */
57 /** For CNAME records, the "next name" to resolve */
60 /** Expiration time */
63 /** Cached dns request, for sending retries */
66 /** Retry parameters */
73 /** Cached dns response */
76 /** Clients / peers awaiting responses */
77 dns_pending_request_t *pending_requests;
80 #define DNS_CACHE_ENTRY_FLAG_VALID (1<<0) /**< we have Actual Data */
81 #define DNS_CACHE_ENTRY_FLAG_STATIC (1<<1) /**< static entry */
82 #define DNS_CACHE_ENTRY_FLAG_CNAME (1<<2) /**< CNAME (indirect) entry */
84 #define DNS_RETRIES_PER_SERVER 3
86 #define DNS_RESOLVER_EVENT_RESOLVED 1
87 #define DNS_RESOLVER_EVENT_PENDING 2
92 /** Pool of cache entries */
93 dns_cache_entry_t *entries;
95 /** Pool indices of unresolved entries */
96 u32 *unresolved_entries;
98 /** Find cached record by name */
99 uword *cache_entry_by_name;
100 clib_spinlock_t cache_lock;
102 /** enable / disable flag */
105 /** udp port registration complete */
106 int udp_ports_registered;
108 /** upstream name servers, e.g. 8.8.8.8 */
109 ip4_address_t *ip4_name_servers;
110 ip6_address_t *ip6_name_servers;
112 /** resolver process node index */
113 u32 resolver_process_node_index;
115 /** config parameters */
117 u32 max_ttl_in_seconds;
121 vlib_main_t *vlib_main;
122 vnet_main_t *vnet_main;
125 extern dns_main_t dns_main;
127 extern vlib_node_registration_t dns46_reply_node;
128 extern vlib_node_registration_t dns4_request_node;
129 extern vlib_node_registration_t dns6_request_node;
131 #define foreach_dns46_request_error \
132 _(NONE, "No error") \
133 _(UNIMPLEMENTED, "Unimplemented") \
134 _(PROCESSED, "DNS request pkts processed") \
135 _(IP_OPTIONS, "DNS pkts with ip options (dropped)") \
136 _(BAD_REQUEST, "DNS pkts with serious discrepanices (dropped)") \
137 _(TOO_MANY_REQUESTS, "DNS pkts asking too many questions") \
138 _(RESOLUTION_REQUIRED, "DNS pkts pending upstream name resolution")
142 #define _(sym,str) DNS46_REQUEST_ERROR_##sym,
143 foreach_dns46_request_error
145 DNS46_REQUEST_N_ERROR,
146 } dns46_request_error_t;
148 #define foreach_dns46_reply_error \
149 _(DISABLED, "DNS pkts punted (feature disabled)") \
150 _(PROCESSED, "DNS reply pkts processed") \
151 _(NO_ELT, "No DNS pool element") \
152 _(FORMAT_ERROR, "DNS format errors") \
153 _(TEST_DROP, "DNS reply pkt dropped for test purposes") \
154 _(MULTIPLE_REPLY, "DNS multiple reply packets") \
155 _(NO_UNRESOLVED_ENTRY, "No unresolved entry for pkt")
159 #define _(sym,str) DNS46_REPLY_ERROR_##sym,
160 foreach_dns46_reply_error
163 } dns46_reply_error_t;
165 void vnet_send_dns_request (dns_main_t * dm, dns_cache_entry_t * ep);
167 vnet_dns_cname_indirection_nolock (dns_main_t * dm, u32 ep_index, u8 * reply);
169 int vnet_dns_delete_entry_by_index_nolock (dns_main_t * dm, u32 index);
172 vnet_dns_resolve_name (dns_main_t * dm, u8 * name, dns_pending_request_t * t,
173 dns_cache_entry_t ** retp);
176 vnet_dns_send_dns6_request (dns_main_t * dm,
177 dns_cache_entry_t * ep, ip6_address_t * server);
179 vnet_dns_send_dns4_request (dns_main_t * dm,
180 dns_cache_entry_t * ep, ip4_address_t * server);
182 void vnet_send_dns4_reply (dns_main_t * dm, dns_pending_request_t * t,
183 dns_cache_entry_t * ep, vlib_buffer_t * b0);
185 void vnet_send_dns6_reply (dns_main_t * dm, dns_pending_request_t * t,
186 dns_cache_entry_t * ep, vlib_buffer_t * b0);
188 u8 *vnet_dns_labels_to_name (u8 * label, u8 * full_text,
189 u8 ** parse_from_here);
191 void vnet_dns_create_resolver_process (dns_main_t * dm);
193 format_function_t format_dns_reply;
196 dns_cache_lock (dns_main_t * dm)
200 clib_spinlock_lock (&dm->cache_lock);
205 dns_cache_unlock (dns_main_t * dm)
209 clib_spinlock_unlock (&dm->cache_lock);
213 #endif /* included_dns_h */
216 * fd.io coding-style-patch-verification: ON
219 * eval: (c-set-style "gnu")