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Support prefixed ranges of ipv6 addresses in dhcp-host.

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When a request matching the clid or mac address is
recieved the server will iterate over all candidate
addresses until it find's one that is not already
leased to a different clid/iaid and advertise
this address.

Using multiple reservations for a single host makes it
possible to maintain a static leases only configuration
which support network booting systems with UEFI firmware
that request a new address (a new SOLICIT with a new IA_NA
option using a new IAID) for different boot modes, for
instance 'PXE over IPv6', and 'HTTP-Boot over IPv6'. Open
Virtual Machine Firmware (OVMF) and most UEFI firmware
build on the EDK2 code base exhibit this behaviour.
This commit is contained in:
Simon Kelley
2020-02-03 23:58:45 +00:00
parent 515ba97595
commit 79aba0f10a
7 changed files with 122 additions and 42 deletions
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5
src/dnsmasq.h
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@@ -767,6 +767,7 @@ struct dhcp_config {
struct dhcp_netid_list *netid;
#ifdef HAVE_DHCP6
struct in6_addr addr6;
int prefix;
#endif
struct in_addr addr;
time_t decline_time;
@@ -790,6 +791,7 @@ struct dhcp_config {
#define CONFIG_ADDR6 4096
#define CONFIG_WILDCARD 8192
#define CONFIG_ADDR6_HOSTS 16384 /* address added by from /etc/hosts */
#define CONFIG_PREFIX 32768 /* addr6 is a set, size given by prefix */
struct dhcp_opt {
int opt, len, flags;
@@ -1508,7 +1510,6 @@ void dhcp6_init(void);
void dhcp6_packet(time_t now);
struct dhcp_context *address6_allocate(struct dhcp_context *context, unsigned char *clid, int clid_len, int temp_addr,
unsigned int iaid, int serial, struct dhcp_netid *netids, int plain_range, struct in6_addr *ans);
int config_valid(struct dhcp_config *config, struct dhcp_context *context, struct in6_addr *addr);
struct dhcp_context *address6_available(struct dhcp_context *context,
struct in6_addr *taddr,
struct dhcp_netid *netids,
@@ -1518,7 +1519,7 @@ struct dhcp_context *address6_valid(struct dhcp_context *context,
struct dhcp_netid *netids,
int plain_range);
struct dhcp_config *config_find_by_address6(struct dhcp_config *configs, struct in6_addr *net,
int prefix, u64 addr);
int prefix, struct in6_addr *addr);
void make_duid(time_t now);
void dhcp_construct_contexts(time_t now);
void get_client_mac(struct in6_addr *client, int iface, unsigned char *mac,