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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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3
src/dhcp-common.c
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@@ -424,10 +424,11 @@ void dhcp_update_configs(struct dhcp_config *configs)
#ifdef HAVE_DHCP6
if (prot == AF_INET6 &&
(!(conf_tmp = config_find_by_address6(configs, &crec->addr.addr6, 128, 0)) || conf_tmp == config))
(!(conf_tmp = config_find_by_address6(configs, NULL, 0, &crec->addr.addr6)) || conf_tmp == config))
{
memcpy(&config->addr6, &crec->addr.addr6, IN6ADDRSZ);
config->flags |= CONFIG_ADDR6 | CONFIG_ADDR6_HOSTS;
config->flags &= ~CONFIG_PREFIX;
continue;
}
#endif