+++ /dev/null
-/*
- * Copyright (c) 2017 Cisco and/or its affiliates.
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at:
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-#ifndef included_dns_h
-#define included_dns_h
-
-#include <vppinfra/time.h>
-#include <vppinfra/cache.h>
-#include <vppinfra/error.h>
-
-#include <vppinfra/hash.h>
-#include <vnet/dns/dns_packet.h>
-#include <vnet/ip/ip.h>
-#include <vppinfra/lock.h>
-
-typedef struct
-{
- u32 request_type;
- u32 client_index;
- u32 client_context;
- u8 is_ip6;
- u16 dst_port;
- u16 id;
- u16 pad;
- u8 dst_address[16];
- u8 *name;
-} dns_pending_request_t;
-
-typedef enum
-{
- DNS_API_PENDING_NAME_TO_IP = 1,
- DNS_API_PENDING_IP_TO_NAME,
- DNS_PEER_PENDING_NAME_TO_IP,
- DNS_PEER_PENDING_IP_TO_NAME,
-} dns_pending_request_type_t;
-
-typedef struct
-{
- /** flags */
- volatile u8 flags;
-
- /** The name in "normal human being" notation, e.g. www.foobar.com */
- u8 *name;
-
- /** For CNAME records, the "next name" to resolve */
- u8 *cname;
-
- /** Expiration time */
- f64 expiration_time;
-
- /** Cached dns request, for sending retries */
- u8 *dns_request;
-
- /** Retry parameters */
- int retry_count;
- int server_rotor;
- int server_af;
- int server_fails;
- f64 retry_timer;
-
- /** Cached dns response */
- u8 *dns_response;
-
- /** Clients / peers awaiting responses */
- dns_pending_request_t *pending_requests;
-} dns_cache_entry_t;
-
-#define DNS_CACHE_ENTRY_FLAG_VALID (1<<0) /**< we have Actual Data */
-#define DNS_CACHE_ENTRY_FLAG_STATIC (1<<1) /**< static entry */
-#define DNS_CACHE_ENTRY_FLAG_CNAME (1<<2) /**< CNAME (indirect) entry */
-
-#define DNS_RETRIES_PER_SERVER 3
-
-#define DNS_RESOLVER_EVENT_RESOLVED 1
-#define DNS_RESOLVER_EVENT_PENDING 2
-
-
-typedef struct
-{
- /** Pool of cache entries */
- dns_cache_entry_t *entries;
-
- /** Pool indices of unresolved entries */
- u32 *unresolved_entries;
-
- /** Find cached record by name */
- uword *cache_entry_by_name;
- clib_spinlock_t cache_lock;
-
- /** enable / disable flag */
- int is_enabled;
-
- /** udp port registration complete */
- int udp_ports_registered;
-
- /** upstream name servers, e.g. 8.8.8.8 */
- ip4_address_t *ip4_name_servers;
- ip6_address_t *ip6_name_servers;
-
- /** resolver process node index */
- u32 resolver_process_node_index;
-
- /** config parameters */
- u32 name_cache_size;
- u32 max_ttl_in_seconds;
- u32 random_seed;
-
- /* convenience */
- vlib_main_t *vlib_main;
- vnet_main_t *vnet_main;
-} dns_main_t;
-
-extern dns_main_t dns_main;
-
-extern vlib_node_registration_t dns46_reply_node;
-extern vlib_node_registration_t dns4_request_node;
-extern vlib_node_registration_t dns6_request_node;
-
-#define foreach_dns46_request_error \
-_(NONE, "No error") \
-_(UNIMPLEMENTED, "Unimplemented") \
-_(PROCESSED, "DNS request pkts processed") \
-_(IP_OPTIONS, "DNS pkts with ip options (dropped)") \
-_(BAD_REQUEST, "DNS pkts with serious discrepanices (dropped)") \
-_(TOO_MANY_REQUESTS, "DNS pkts asking too many questions") \
-_(RESOLUTION_REQUIRED, "DNS pkts pending upstream name resolution")
-
-typedef enum
-{
-#define _(sym,str) DNS46_REQUEST_ERROR_##sym,
- foreach_dns46_request_error
-#undef _
- DNS46_REQUEST_N_ERROR,
-} dns46_request_error_t;
-
-#define foreach_dns46_reply_error \
-_(DISABLED, "DNS pkts punted (feature disabled)") \
-_(PROCESSED, "DNS reply pkts processed") \
-_(NO_ELT, "No DNS pool element") \
-_(FORMAT_ERROR, "DNS format errors") \
-_(TEST_DROP, "DNS reply pkt dropped for test purposes") \
-_(MULTIPLE_REPLY, "DNS multiple reply packets") \
-_(NO_UNRESOLVED_ENTRY, "No unresolved entry for pkt")
-
-typedef enum
-{
-#define _(sym,str) DNS46_REPLY_ERROR_##sym,
- foreach_dns46_reply_error
-#undef _
- DNS46_REPLY_N_ERROR,
-} dns46_reply_error_t;
-
-void vnet_send_dns_request (dns_main_t * dm, dns_cache_entry_t * ep);
-int
-vnet_dns_cname_indirection_nolock (dns_main_t * dm, u32 ep_index, u8 * reply);
-
-int vnet_dns_delete_entry_by_index_nolock (dns_main_t * dm, u32 index);
-
-int
-vnet_dns_resolve_name (dns_main_t * dm, u8 * name, dns_pending_request_t * t,
- dns_cache_entry_t ** retp);
-
-void
-vnet_dns_send_dns6_request (dns_main_t * dm,
- dns_cache_entry_t * ep, ip6_address_t * server);
-void
-vnet_dns_send_dns4_request (dns_main_t * dm,
- dns_cache_entry_t * ep, ip4_address_t * server);
-
-void vnet_send_dns4_reply (dns_main_t * dm, dns_pending_request_t * t,
- dns_cache_entry_t * ep, vlib_buffer_t * b0);
-
-void vnet_send_dns6_reply (dns_main_t * dm, dns_pending_request_t * t,
- dns_cache_entry_t * ep, vlib_buffer_t * b0);
-
-u8 *vnet_dns_labels_to_name (u8 * label, u8 * full_text,
- u8 ** parse_from_here);
-
-void vnet_dns_create_resolver_process (dns_main_t * dm);
-
-format_function_t format_dns_reply;
-
-static inline void
-dns_cache_lock (dns_main_t * dm)
-{
- if (dm->cache_lock)
- {
- clib_spinlock_lock (&dm->cache_lock);
- }
-}
-
-static inline void
-dns_cache_unlock (dns_main_t * dm)
-{
- if (dm->cache_lock)
- {
- clib_spinlock_unlock (&dm->cache_lock);
- }
-}
-
-#endif /* included_dns_h */
-
-/*
- * fd.io coding-style-patch-verification: ON
- *
- * Local Variables:
- * eval: (c-set-style "gnu")
- * End:
- */
Code Review / vpp.git / blobdiff