vpp - Vector Packet Processing

Age	Commit message (Expand)	Author	Files	Lines
2022-01-05	dpdk: move port config to single struct	Damjan Marion	1	-0/+1
2021-04-27	misc: add StatementMacros to .clang-format	Damjan Marion	1	-0/+6
2021-03-26	vlib: convert foreach_vlib_main macro to be more gdb and clang-format friendly	Damjan Marion	1	-0/+1
2020-12-18	misc: migrate from GNU indent to clang-format	Damjan Marion	1	-37/+20
2017-09-19	Add C++ API	Klement Sekera	1	-0/+38

/a> 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156

/*
 * Copyright (c) 2015 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_packet_h
#define included_dns_packet_h

/**
 * DNS packet header format
 */

/* *INDENT-OFF* */
typedef CLIB_PACKED (struct {
  u16 id;                       /**< transaction ID */
  u16 flags;                    /**< flags  */
  u16 qdcount;                  /**< number of questions */
  u16 anscount;                 /**< number of answers */
  u16 nscount;                  /**< number of name servers */
  u16 arcount;                  /**< number of additional records */
}) dns_header_t;
/* *INDENT-ON* */

#define DNS_RCODE_MASK (0xf)
#define DNS_RCODE_NO_ERROR 0
#define DNS_RCODE_FORMAT_ERROR 1
#define DNS_RCODE_SERVER_FAILURE 2
#define DNS_RCODE_NAME_ERROR 3
#define DNS_RCODE_NOT_IMPLEMENTED 4
#define DNS_RCODE_REFUSED 5

#define DNS_RA (1<<7)		/**< recursion available */
#define DNS_RD (1<<8)		/**< recursion desired */
#define DNS_TC (1<<9)	       /**< truncation  */
#define DNS_AA (1<<10)		/**< authoritative answer  */
#define DNS_OPCODE_MASK (0xf<<11) /**< opcode mask */
#define DNS_OPCODE_QUERY (0<<11)  /**< standard query */
#define DNS_OPCODE_IQUERY (1<<11) /**< inverse query (deprecated) */
#define DNS_OPCODE_STATUS (2<<11) /**< server status  */
#define DNS_QR (1<<15)		/**< query=0, response=1  */


/*
 * Note: in DNS-land, www.foobar.com is encoded as three "labels,"
 * each of which amount to a 1 octet length followed by up to 63
 * octets of name. Don't forget to add a "null root label" after the last
 * real one, or the poor slob trying to parse the name will have
 * no chance whatsoever.
 *
 * All RRs have the same top level format shown below:
 *
 *                                    1  1  1  1  1  1
 *      0  1  2  3  4  5  6  7  8  9  0  1  2  3  4  5
 *    +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 *    |                                               |
 *    /                                               /
 *    /                      NAME                     /
 *    |                                               |
 *    +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 *    |                      TYPE                     |
 *    +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 *    |                     CLASS                     |
 *    +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 *    |                      TTL                      |
 *    |                                               |
 *    +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 *    |                   RDLENGTH                    |
 *    +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--|
 *    /                     RDATA                     /
 *    /                                               /
 *    +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 *
 *
 *  DNS "questions" have the following format:
 *
 *                                     1  1  1  1  1  1
 *       0  1  2  3  4  5  6  7  8  9  0  1  2  3  4  5
 *     +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 *     |                                               |
 *     /                     QNAME                     /
 *     /                                               /
 *     +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 *     |                     QTYPE                     |
 *     +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 *     |                     QCLASS                    |
 *     +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 */

/**
 * DNS "question" fixed header.
 */
/* *INDENT-OFF* */
typedef CLIB_PACKED (struct {
  u16 type;	/**< record type requested */
  u16 class;	/**< class, 1 = internet */
}) dns_query_t;
/* *INDENT-ON* */

/**
 * DNS RR fixed header.
 */
/* *INDENT-OFF* */
typedef CLIB_PACKED (struct {
  u16 type;	/**< record type */
  u16 class;	/**< class, 1 = internet */
  u32 ttl;	/**< time to live, in seconds */
  u16 rdlength;
  /**< length of r */
  u8 rdata[0];
}) dns_rr_t;
/* *INDENT-ON* */

/*
 * There are quite a number of DNS record types
 * Feel free to add as needed
 */
#define foreach_dns_type                        \
_(A, 1) 	/**< ip4 host address */        \
_(AAAA, 28)     /**< ip6 host address */        \
_(ALL, 255)     /**< all available data */      \
_(TEXT, 16)     /**< a text string */           \
_(NAMESERVER, 2) /**< a nameserver */           \
_(CNAME, 5)      /**< a CNAME (alias) */	\
_(MAIL_EXCHANGE, 15) /**< a mail exchange  */	\
_(PTR, 12)      /**< a PTR (pointer) record */	\
_(HINFO, 13)	/**< Host info */

typedef enum
{
#define _(name,value) DNS_TYPE_##name = value,
  foreach_dns_type
#undef _
} dns_type_t;

#define DNS_CLASS_IN	1	/**< The Internet */


#endif /* included_dns_packet_h */

/*
 * fd.io coding-style-patch-verification: ON
 *
 * Local Variables:
 * eval: (c-set-style "gnu")
 * End:
 */