af2cc6425e
Type: feature Ticket: VPP-1901 Change-Id: I1ad222b54363fd35679d0132d458345a9a18362c Signed-off-by: Filip Tehlar <ftehlar@cisco.com>
243 lines
6.2 KiB
C
243 lines
6.2 KiB
C
/*
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* Copyright (c) 2017 Cisco and/or its affiliates.
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at:
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef included_dns_h
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#define included_dns_h
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#include <vppinfra/time.h>
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#include <vppinfra/cache.h>
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#include <vppinfra/error.h>
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#include <vppinfra/hash.h>
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#include <dns/dns_packet.h>
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#include <vnet/ip/ip.h>
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#include <vppinfra/lock.h>
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#include <vlibapi/api_common.h>
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typedef struct
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{
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u32 request_type;
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u32 client_index;
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u32 client_context;
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u8 is_ip6;
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u16 dst_port;
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u16 id;
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u16 pad;
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u8 dst_address[16];
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u8 *name;
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} dns_pending_request_t;
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typedef struct
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{
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ip_address_t address;
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} dns_resolve_name_t;
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typedef enum
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{
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DNS_API_PENDING_NAME_TO_IP = 1,
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DNS_API_PENDING_IP_TO_NAME,
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DNS_PEER_PENDING_NAME_TO_IP,
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DNS_PEER_PENDING_IP_TO_NAME,
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} dns_pending_request_type_t;
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typedef struct
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{
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/** flags */
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volatile u8 flags;
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/** The name in "normal human being" notation, e.g. www.foobar.com */
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u8 *name;
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/** For CNAME records, the "next name" to resolve */
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u8 *cname;
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/** Expiration time */
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f64 expiration_time;
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/** Cached dns request, for sending retries */
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u8 *dns_request;
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/** Retry parameters */
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int retry_count;
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int server_rotor;
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int server_af;
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int server_fails;
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f64 retry_timer;
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/** Cached dns response */
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u8 *dns_response;
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/** Clients / peers awaiting responses */
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dns_pending_request_t *pending_requests;
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} dns_cache_entry_t;
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#define DNS_CACHE_ENTRY_FLAG_VALID (1<<0) /**< we have Actual Data */
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#define DNS_CACHE_ENTRY_FLAG_STATIC (1<<1) /**< static entry */
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#define DNS_CACHE_ENTRY_FLAG_CNAME (1<<2) /**< CNAME (indirect) entry */
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#define DNS_RETRIES_PER_SERVER 3
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#define DNS_RESOLVER_EVENT_RESOLVED 1
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#define DNS_RESOLVER_EVENT_PENDING 2
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typedef struct
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{
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/** Pool of cache entries */
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dns_cache_entry_t *entries;
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/** Pool indices of unresolved entries */
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u32 *unresolved_entries;
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/** Find cached record by name */
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uword *cache_entry_by_name;
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clib_spinlock_t cache_lock;
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int cache_lock_tag;
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/** enable / disable flag */
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int is_enabled;
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/** udp port registration complete */
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int udp_ports_registered;
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/** upstream name servers, e.g. 8.8.8.8 */
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ip4_address_t *ip4_name_servers;
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ip6_address_t *ip6_name_servers;
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/** resolver process node index */
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u32 resolver_process_node_index;
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/** config parameters */
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u32 name_cache_size;
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u32 max_ttl_in_seconds;
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u32 random_seed;
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/** message-ID base */
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u16 msg_id_base;
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/* convenience */
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vnet_main_t *vnet_main;
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api_main_t *api_main;
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} dns_main_t;
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extern dns_main_t dns_main;
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extern vlib_node_registration_t dns46_reply_node;
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extern vlib_node_registration_t dns4_request_node;
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extern vlib_node_registration_t dns6_request_node;
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#define foreach_dns46_request_error \
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_(NONE, "No error") \
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_(UNIMPLEMENTED, "Unimplemented") \
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_(PROCESSED, "DNS request pkts processed") \
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_(IP_OPTIONS, "DNS pkts with ip options (dropped)") \
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_(BAD_REQUEST, "DNS pkts with serious discrepancies (dropped)") \
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_(TOO_MANY_REQUESTS, "DNS pkts asking too many questions") \
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_(RESOLUTION_REQUIRED, "DNS pkts pending upstream name resolution")
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typedef enum
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{
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#define _(sym,str) DNS46_REQUEST_ERROR_##sym,
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foreach_dns46_request_error
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#undef _
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DNS46_REQUEST_N_ERROR,
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} dns46_request_error_t;
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#define foreach_dns46_reply_error \
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_(DISABLED, "DNS pkts punted (feature disabled)") \
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_(PROCESSED, "DNS reply pkts processed") \
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_(NO_ELT, "No DNS pool element") \
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_(FORMAT_ERROR, "DNS format errors") \
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_(TEST_DROP, "DNS reply pkt dropped for test purposes") \
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_(MULTIPLE_REPLY, "DNS multiple reply packets") \
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_(NO_UNRESOLVED_ENTRY, "No unresolved entry for pkt")
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typedef enum
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{
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#define _(sym,str) DNS46_REPLY_ERROR_##sym,
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foreach_dns46_reply_error
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#undef _
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DNS46_REPLY_N_ERROR,
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} dns46_reply_error_t;
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void vnet_send_dns_request (vlib_main_t * vm, dns_main_t * dm,
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dns_cache_entry_t * ep);
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int vnet_dns_cname_indirection_nolock (vlib_main_t * vm, dns_main_t * dm,
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u32 ep_index, u8 * reply);
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int vnet_dns_delete_entry_by_index_nolock (dns_main_t * dm, u32 index);
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int
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vnet_dns_resolve_name (vlib_main_t * vm, dns_main_t * dm, u8 * name,
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dns_pending_request_t * t, dns_cache_entry_t ** retp);
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void
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vnet_dns_send_dns6_request (vlib_main_t * vm, dns_main_t * dm,
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dns_cache_entry_t * ep, ip6_address_t * server);
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void
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vnet_dns_send_dns4_request (vlib_main_t * vm, dns_main_t * dm,
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dns_cache_entry_t * ep, ip4_address_t * server);
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void vnet_send_dns4_reply (vlib_main_t * vm, dns_main_t * dm,
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dns_pending_request_t * t, dns_cache_entry_t * ep,
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vlib_buffer_t * b0);
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void vnet_send_dns6_reply (vlib_main_t * vm, dns_main_t * dm,
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dns_pending_request_t * t, dns_cache_entry_t * ep,
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vlib_buffer_t * b0);
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u8 *vnet_dns_labels_to_name (u8 * label, u8 * full_text,
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u8 ** parse_from_here);
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void vnet_dns_create_resolver_process (vlib_main_t * vm, dns_main_t * dm);
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format_function_t format_dns_reply;
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static inline void
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dns_cache_lock (dns_main_t * dm, int tag)
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{
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if (dm->cache_lock)
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{
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ASSERT (tag);
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ASSERT (dm->cache_lock_tag == 0);
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clib_spinlock_lock (&dm->cache_lock);
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dm->cache_lock_tag = tag;
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}
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}
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static inline void
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dns_cache_unlock (dns_main_t * dm)
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{
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if (dm->cache_lock)
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{
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ASSERT (dm->cache_lock_tag);
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dm->cache_lock_tag = 0;
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clib_spinlock_unlock (&dm->cache_lock);
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}
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}
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extern int dns_resolve_name (u8 *name, dns_cache_entry_t **ep,
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dns_pending_request_t *t0,
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dns_resolve_name_t *rn);
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#endif /* included_dns_h */
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/*
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* fd.io coding-style-patch-verification: ON
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*
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* Local Variables:
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* eval: (c-set-style "gnu")
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* End:
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*/
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