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networkd: dhcp-server - allow configuration of the pool

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The constraints we place on the pool is that it is a contiguous
sequence of addresses in the same subnet as the server address, not
including the subnet nor broadcast addresses, but possibly including
the server address itself. If the server address is included in the
pool it is (obviously) reserved and not handed out to clients.
This commit is contained in:
Tom Gundersen 2015-08-29 00:18:20 +02:00
parent 61986155d2
commit 9b3a67c55b
6 changed files with 25 additions and 1 deletions
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17
man/systemd.network.xml
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@ -683,6 +683,23 @@
<variablelist class='network-directives'>
<varlistentry>
<term><varname>PoolOffset=</varname></term>
<term><varname>PoolSize=</varname></term>
<listitem><para>Configures the pool of addresses to hand out. The pool
is a contiguous sequence of IP addresses in the subnet configured for
the server address, which does not include the subnet nor the broadcast
address. <varname>PoolOffset=</varname> takes the offset of the pool
from the start of subnet, or zero to use the default value.
<varname>PoolSize=</varname> takes the number of IP addresses in the
pool or zero to use the default value. By default the pool starts at
the first address after the subnet address and takes up the rest of
the subnet, excluding the broadcast address. If the pool includes
the server address (the default), this is reserved and not handed
out to clients.</para></listitem>
</varlistentry>
<varlistentry>
<term><varname>DefaultLeaseTimeSec=</varname></term>
<term><varname>MaxLeaseTimeSec=</varname></term>

3
src/network/networkd-link.c
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@ -742,7 +742,8 @@ static int link_enter_set_addresses(Link *link) {
}
/* use the server address' subnet as the pool */
r = sd_dhcp_server_configure_pool(link->dhcp_server, &address->in_addr.in, address->prefixlen, 0, 0);
r = sd_dhcp_server_configure_pool(link->dhcp_server, &address->in_addr.in, address->prefixlen,
link->network->dhcp_server_pool_offset, link->network->dhcp_server_pool_size);
if (r < 0)
return r;

2
src/network/networkd-network-gperf.gperf
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@ -82,6 +82,8 @@ DHCPServer.EmitNTP, config_parse_bool, 0
DHCPServer.NTP, config_parse_dhcp_server_ntp, 0, 0
DHCPServer.EmitTimezone, config_parse_bool, 0, offsetof(Network, dhcp_server_emit_timezone)
DHCPServer.Timezone, config_parse_timezone, 0, offsetof(Network, dhcp_server_timezone)
DHCPServer.PoolOffset, config_parse_uint32, 0, offsetof(Network, dhcp_server_pool_offset)
DHCPServer.PoolSize, config_parse_uint32, 0, offsetof(Network, dhcp_server_pool_size)
Bridge.Cost, config_parse_unsigned, 0, offsetof(Network, cost)
Bridge.UseBPDU, config_parse_bool, 0, offsetof(Network, use_bpdu)
Bridge.HairPin, config_parse_bool, 0, offsetof(Network, hairpin)

2
src/network/networkd-network.h
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@ -102,6 +102,8 @@ struct Network {
bool dhcp_server_emit_timezone;
char *dhcp_server_timezone;
usec_t dhcp_server_default_lease_time_usec, dhcp_server_max_lease_time_usec;
uint32_t dhcp_server_pool_offset;
uint32_t dhcp_server_pool_size;
/* IPV4LL Support */
AddressFamilyBoolean link_local;

1
src/shared/conf-parser.c
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@ -450,6 +450,7 @@ int config_parse_many(const char *conf_file,
DEFINE_PARSER(int, int, safe_atoi)
DEFINE_PARSER(long, long, safe_atoli)
DEFINE_PARSER(uint32, uint32_t, safe_atou32)
DEFINE_PARSER(uint64, uint64_t, safe_atou64)
DEFINE_PARSER(unsigned, unsigned, safe_atou)
DEFINE_PARSER(double, double, safe_atod)

1
src/shared/conf-parser.h
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@ -104,6 +104,7 @@ int config_parse_many(const char *conf_file, /* possibly NULL */
int config_parse_int(const char *unit, const char *filename, unsigned line, const char *section, unsigned section_line, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata);
int config_parse_unsigned(const char *unit, const char *filename, unsigned line, const char *section, unsigned section_line, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata);
int config_parse_long(const char *unit, const char *filename, unsigned line, const char *section, unsigned section_line, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata);
int config_parse_uint32(const char *unit, const char *filename, unsigned line, const char *section, unsigned section_line, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata);
int config_parse_uint64(const char *unit, const char *filename, unsigned line, const char *section, unsigned section_line, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata);
int config_parse_double(const char *unit, const char *filename, unsigned line, const char *section, unsigned section_line, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata);
int config_parse_iec_size(const char *unit, const char *filename, unsigned line, const char *section, unsigned section_line, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata);