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network: dhcp-server: introduce Router= setting to specify router address

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Closes #21202.
This commit is contained in:
Yu Watanabe 2021-11-02 12:58:50 +09:00
parent 222cd15654
commit 59aa622013
8 changed files with 31 additions and 15 deletions
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14
man/systemd.network.xml
View file

@ -2482,12 +2482,16 @@ Token=prefixstable:2002:da8:1::</programlisting></para>
<varlistentry>
<term><varname>EmitRouter=</varname></term>
<term><varname>Router=</varname></term>
<listitem><para>Similar to the <varname>EmitDNS=</varname>
setting described above, this setting configures whether the
DHCP lease should contain the router option. The same syntax,
propagation semantics and defaults apply as for
<varname>EmitDNS=</varname>.</para></listitem>
<listitem><para>The <varname>EmitRouter=</varname> setting takes a boolean value, and configures
whether the DHCP lease should contain the router option. The <varname>Router=</varname> setting
takes an IPv4 address, and configures the router address to be emitted. When the
<varname>Router=</varname> setting is not specified, then the server address will be used for
the router option. When the <varname>EmitRouter=</varname> setting is disabled, the
<varname>Router=</varname> setting will be ignored. The <varname>EmitRouter=</varname> setting
defaults to true, and the <varname>Router=</varname> setting defaults to unset.
</para></listitem>
</varlistentry>
<varlistentry>

1
src/libsystemd-network/dhcp-server-internal.h
View file

@ -68,6 +68,7 @@ struct sd_dhcp_server {
OrderedSet *vendor_options;
bool emit_router;
struct in_addr router_address;
Hashmap *bound_leases_by_client_id;
Hashmap *bound_leases_by_address;

18
src/libsystemd-network/sd-dhcp-server.c
View file

@ -533,7 +533,10 @@ static int server_send_offer_or_ack(
if (server->emit_router) {
r = dhcp_option_append(&packet->dhcp, req->max_optlen, &offset, 0,
SD_DHCP_OPTION_ROUTER, 4, &server->address);
SD_DHCP_OPTION_ROUTER, 4,
in4_addr_is_set(&server->router_address) ?
&server->router_address.s_addr :
&server->address);
if (r < 0)
return r;
}
@ -1418,15 +1421,18 @@ int sd_dhcp_server_set_lpr(sd_dhcp_server *server, const struct in_addr lpr[], s
return sd_dhcp_server_set_servers(server, SD_DHCP_LEASE_LPR, lpr, n);
}
int sd_dhcp_server_set_emit_router(sd_dhcp_server *server, int enabled) {
int sd_dhcp_server_set_router(sd_dhcp_server *server, const struct in_addr *router) {
assert_return(server, -EINVAL);
if (enabled == server->emit_router)
return 0;
/* router is NULL: router option will not be appended.
* router is null address (0.0.0.0): the server address will be used as the router address.
* otherwise: the specified address will be used as the router address.*/
server->emit_router = enabled;
server->emit_router = router;
if (router)
server->router_address = *router;
return 1;
return 0;
}
int sd_dhcp_server_add_option(sd_dhcp_server *server, sd_dhcp_option *v) {

8
src/network/networkd-dhcp-server.c
View file

@ -448,9 +448,11 @@ static int dhcp4_server_configure(Link *link) {
dhcp_lease_server_type_to_string(type));
}
r = sd_dhcp_server_set_emit_router(link->dhcp_server, link->network->dhcp_server_emit_router);
if (r < 0)
return log_link_error_errno(link, r, "Failed to set router emission for DHCP server: %m");
if (link->network->dhcp_server_emit_router) {
r = sd_dhcp_server_set_router(link->dhcp_server, &link->network->dhcp_server_router);
if (r < 0)
return log_link_error_errno(link, r, "Failed to set router address for DHCP server: %m");
}
r = sd_dhcp_server_set_relay_target(link->dhcp_server, &link->network->dhcp_server_relay_target);
if (r < 0)

1
src/network/networkd-network-gperf.gperf
View file

@ -290,6 +290,7 @@ DHCPServer.SMTP, config_parse_dhcp_server_emit,
DHCPServer.EmitLPR, config_parse_bool, 0, offsetof(Network, dhcp_server_emit[SD_DHCP_LEASE_LPR].emit)
DHCPServer.LPR, config_parse_dhcp_server_emit, 0, offsetof(Network, dhcp_server_emit[SD_DHCP_LEASE_LPR])
DHCPServer.EmitRouter, config_parse_bool, 0, offsetof(Network, dhcp_server_emit_router)
DHCPServer.Router, config_parse_in_addr_non_null, AF_INET, offsetof(Network, dhcp_server_router)
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)

1
src/network/networkd-network.h
View file

@ -202,6 +202,7 @@ struct Network {
char *dhcp_server_relay_agent_remote_id;
NetworkDHCPServerEmitAddress dhcp_server_emit[_SD_DHCP_LEASE_SERVER_TYPE_MAX];
bool dhcp_server_emit_router;
struct in_addr dhcp_server_router;
bool dhcp_server_emit_timezone;
char *dhcp_server_timezone;
usec_t dhcp_server_default_lease_time_usec, dhcp_server_max_lease_time_usec;

2
src/systemd/sd-dhcp-server.h
View file

@ -60,7 +60,7 @@ int sd_dhcp_server_configure_pool(sd_dhcp_server *server, const struct in_addr *
int sd_dhcp_server_set_bind_to_interface(sd_dhcp_server *server, int enabled);
int sd_dhcp_server_set_timezone(sd_dhcp_server *server, const char *timezone);
int sd_dhcp_server_set_emit_router(sd_dhcp_server *server, int enabled);
int sd_dhcp_server_set_router(sd_dhcp_server *server, const struct in_addr *address);
int sd_dhcp_server_set_servers(
sd_dhcp_server *server,

1
test/fuzz/fuzz-network-parser/directives.network
View file

@ -379,6 +379,7 @@ SMTP=
EmitLPR=
LPR=
EmitRouter=
Router=
MaxLeaseTimeSec=
DefaultLeaseTimeSec=
EmitTimezone=