--- /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 <dns/dns_packet.h>
+#include <vnet/ip/ip.h>
+#include <vppinfra/lock.h>
+#include <vlibapi/api_common.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;
+
+ /** message-ID base */
+ u16 msg_id_base;
+
+ /* convenience */
+ vlib_main_t *vlib_main;
+ vnet_main_t *vnet_main;
+ api_main_t *api_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