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[dns] Add support for resolving IPv6 addresses via AAAA records

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Our policy is to prefer IPv6 addreses to IPv4 addresses, but to
request IPv6 addresses only if we have an IPv6 address for the name
server itself.

Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown
2013-12-04 22:21:47 +00:00
parent 60c4e62e5d
commit 6248894f52
4 changed files with 112 additions and 36 deletions
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4
src/include/ipxe/dhcpv6.h
View File

@@ -147,10 +147,10 @@ struct dhcpv6_user_class_option {
#define DHCPV6_USER_CLASS 15
/** DHCPv6 DNS recursive name server option */
#define DHCPV6_DNS_SERVER 23
#define DHCPV6_DNS_SERVERS 23
/** DHCPv6 domain search list option */
#define DHCPV6_DOMAIN_SEARCH 24
#define DHCPV6_DOMAIN_LIST 24
/**
* Any DHCPv6 option

7
src/include/ipxe/dns.h
View File

@@ -19,6 +19,7 @@ FILE_LICENCE ( GPL2_OR_LATER );
#define DNS_TYPE_A 1
#define DNS_TYPE_CNAME 5
#define DNS_TYPE_AAAA 28
#define DNS_TYPE_ANY 255
#define DNS_CLASS_IN 1
@@ -78,6 +79,11 @@ struct dns_rr_info_a {
struct in_addr in_addr;
} __attribute__ (( packed ));
struct dns_rr_info_aaaa {
struct dns_rr_info_common common;
struct in6_addr in6_addr;
} __attribute__ (( packed ));
struct dns_rr_info_cname {
struct dns_rr_info_common common;
char cname[0];
@@ -86,6 +92,7 @@ struct dns_rr_info_cname {
union dns_rr_info {
struct dns_rr_info_common common;
struct dns_rr_info_a a;
struct dns_rr_info_aaaa aaaa;
struct dns_rr_info_cname cname;
};