Add qemu 2.4.0

[kvmfornfv.git] / qemu / roms / ipxe / src / include / ipxe / dns.h

diff --git a/qemu/roms/ipxe/src/include/ipxe/dns.h b/qemu/roms/ipxe/src/include/ipxe/dns.h
new file mode 100644 (file)
index 0000000..4f6cab3
--- /dev/null
+++ b/qemu/roms/ipxe/src/include/ipxe/dns.h
@@ -0,0 +1,155 @@
+#ifndef _IPXE_DNS_H
+#define _IPXE_DNS_H
+
+/** @file
+ *
+ * DNS protocol
+ *
+ */
+
+FILE_LICENCE ( GPL2_OR_LATER );
+
+#include <stdint.h>
+#include <ipxe/in.h>
+
+/** DNS server port */
+#define DNS_PORT 53
+
+/** An RFC1035-encoded DNS name */
+struct dns_name {
+       /** Start of data */
+       void *data;
+       /** Offset of name within data */
+       size_t offset;
+       /** Total length of data */
+       size_t len;
+};
+
+/**
+ * Test for a DNS compression pointer
+ *
+ * @v byte             Initial byte
+ * @ret is_compressed  Is a compression pointer
+ */
+#define DNS_IS_COMPRESSED( byte ) ( (byte) & 0xc0 )
+
+/**
+ * Extract DNS compression pointer
+ *
+ * @v word             Initial word
+ * @ret offset         Offset
+ */
+#define DNS_COMPRESSED_OFFSET( word ) ( (word) & ~0xc000 )
+
+/**
+ * Extract DNS label length
+ *
+ * @v byte             Initial byte
+ * @ret len            Label length
+ */
+#define DNS_LABEL_LEN( byte ) ( (byte) & ~0xc0 )
+
+/** Maximum length of a single DNS label */
+#define DNS_MAX_LABEL_LEN 0x3f
+
+/** Maximum length of a DNS name (mandated by RFC1035 section 2.3.4) */
+#define DNS_MAX_NAME_LEN 255
+
+/** Maximum depth of CNAME recursion
+ *
+ * This is a policy decision.
+ */
+#define DNS_MAX_CNAME_RECURSION 32
+
+/** A DNS packet header */
+struct dns_header {
+       /** Query identifier */
+       uint16_t id;
+       /** Flags */
+       uint16_t flags;
+       /** Number of question records */
+       uint16_t qdcount;
+       /** Number of answer records */
+       uint16_t ancount;
+       /** Number of name server records */
+       uint16_t nscount;
+       /** Number of additional records */
+       uint16_t arcount;
+} __attribute__ (( packed ));
+
+/** Recursion desired flag */
+#define DNS_FLAG_RD 0x0100
+
+/** A DNS question */
+struct dns_question {
+       /** Query type */
+       uint16_t qtype;
+       /** Query class */
+       uint16_t qclass;
+} __attribute__ (( packed ));
+
+/** DNS class "IN" */
+#define DNS_CLASS_IN 1
+
+/** A DNS resource record */
+struct dns_rr_common {
+       /** Type */
+       uint16_t type;
+       /** Class */
+       uint16_t class;
+       /** Time to live */
+       uint32_t ttl;
+       /** Resource data length */
+       uint16_t rdlength;
+} __attribute__ (( packed ));
+
+/** Type of a DNS "A" record */
+#define DNS_TYPE_A 1
+
+/** A DNS "A" record */
+struct dns_rr_a {
+       /** Common fields */
+       struct dns_rr_common common;
+       /** IPv4 address */
+       struct in_addr in_addr;
+} __attribute__ (( packed ));
+
+/** Type of a DNS "AAAA" record */
+#define DNS_TYPE_AAAA 28
+
+/** A DNS "AAAA" record */
+struct dns_rr_aaaa {
+       /** Common fields */
+       struct dns_rr_common common;
+       /** IPv6 address */
+       struct in6_addr in6_addr;
+} __attribute__ (( packed ));
+
+/** Type of a DNS "NAME" record */
+#define DNS_TYPE_CNAME 5
+
+/** A DNS "CNAME" record */
+struct dns_rr_cname {
+       /** Common fields */
+       struct dns_rr_common common;
+} __attribute__ (( packed ));
+
+/** A DNS resource record */
+union dns_rr {
+       /** Common fields */
+       struct dns_rr_common common;
+       /** "A" record */
+       struct dns_rr_a a;
+       /** "AAAA" record */
+       struct dns_rr_aaaa aaaa;
+       /** "CNAME" record */
+       struct dns_rr_cname cname;
+};
+
+extern int dns_encode ( const char *string, struct dns_name *name );
+extern int dns_decode ( struct dns_name *name, char *data, size_t len );
+extern int dns_compare ( struct dns_name *first, struct dns_name *second );
+extern int dns_copy ( struct dns_name *src, struct dns_name *dst );
+extern int dns_skip ( struct dns_name *name );
+
+#endif /* _IPXE_DNS_H */