[systemd-devel] [PATCH 17/17] networkd: add dhcp server support
Tom Gundersen
teg at jklm.no
Mon May 26 12:39:46 PDT 2014
When enabled in [Network] it will set up a dhcp server on the interface, listening
on one of its statically configured IPv4 addresses and with a fixed size pool of
leases determined from it.
Example:
[Match]
Name=ve-arch-tree
[Network]
Address=192.168.12.5/24
DHCPServer=yes
[Route]
Gateway=192.168.12.5
Destination=192.168.12.0/24
In this case we will configure ve-arch-tree with the address 192.168.12.5 and
hand out addresses in the range 192.168.12.6 - 192.168.12.38.
In the future, we should (as suggested by Lennart) introduce a syntax to pick the
server address automatically.
---
src/network/networkd-link.c | 101 ++++++++++++++++++++++++++-----
src/network/networkd-network-gperf.gperf | 1 +
src/network/networkd.h | 5 ++
3 files changed, 93 insertions(+), 14 deletions(-)
diff --git a/src/network/networkd-link.c b/src/network/networkd-link.c
index 6677b94..b80a002 100644
--- a/src/network/networkd-link.c
+++ b/src/network/networkd-link.c
@@ -174,19 +174,6 @@ void link_drop(Link *link) {
return;
}
-static int link_enter_configured(Link *link) {
- assert(link);
- assert(link->state == LINK_STATE_SETTING_ROUTES);
-
- log_info_link(link, "link configured");
-
- link->state = LINK_STATE_CONFIGURED;
-
- link_save(link);
-
- return 0;
-}
-
static void link_enter_unmanaged(Link *link) {
assert(link);
@@ -227,6 +214,16 @@ static int link_stop_clients(Link *link) {
}
}
+ if (link->network->dhcp_server) {
+ assert(link->dhcp_server);
+
+ k = sd_dhcp_server_stop(link->dhcp_server);
+ if (k < 0) {
+ log_warning_link(link, "Could not stop DHCPv4 server: %s", strerror(-r));
+ r = k;
+ }
+ }
+
return r;
}
@@ -245,6 +242,37 @@ static void link_enter_failed(Link *link) {
link_save(link);
}
+static int link_enter_configured(Link *link) {
+ int r;
+
+ assert(link);
+ assert(link->network);
+ assert(link->state == LINK_STATE_SETTING_ROUTES);
+
+
+ if (link->network->dhcp_server) {
+ log_debug_link(link, "offering DHCPv4 leases");
+
+ r = sd_dhcp_server_start(link->dhcp_server);
+ if (r < 0) {
+ log_warning_link(link, "could not start DHCPv4 server "
+ "instance: %s", strerror(-r));
+
+ link_enter_failed(link);
+
+ return 0;
+ }
+ }
+
+ log_info_link(link, "link configured");
+
+ link->state = LINK_STATE_CONFIGURED;
+
+ link_save(link);
+
+ return 0;
+}
+
static int route_handler(sd_rtnl *rtnl, sd_rtnl_message *m, void *userdata) {
Link *link = userdata;
int r;
@@ -1663,7 +1691,52 @@ static int link_configure(Link *link) {
}
}
- if (link_has_carrier(link->flags, link->kernel_operstate)) {
+ if (link->network->dhcp_server) {
+ Address *address;
+
+ r = sd_dhcp_server_new(&link->dhcp_server, link->ifindex);
+ if (r < 0)
+ return r;
+
+ r = sd_dhcp_server_attach_event(link->dhcp_server, NULL, 0);
+ if (r < 0)
+ return r;
+
+ LIST_FOREACH(addresses, address,
+ link->network->static_addresses) {
+ struct in_addr pool_start;
+
+ if (address->family != AF_INET)
+ continue;
+
+ /* currently this is picked essentially at random */
+ r = sd_dhcp_server_set_address(link->dhcp_server,
+ &address->in_addr.in);
+ if (r < 0)
+ return r;
+
+ /* offer 32 addresses starting from the address following the server address */
+ pool_start.s_addr = htobe32(be32toh(address->in_addr.in.s_addr) + 1);
+ r = sd_dhcp_server_set_lease_pool(link->dhcp_server,
+ &pool_start, 32);
+
+ break;
+ }
+
+ /* TODO:
+ r = sd_dhcp_server_set_router(link->dhcp_server,
+ &main_address->in_addr.in);
+ if (r < 0)
+ return r;
+
+ r = sd_dhcp_server_set_prefixlen(link->dhcp_server,
+ main_address->prefixlen);
+ if (r < 0)
+ return r;
+ */
+ }
+
+ if (link_has_carrier(link->flags, link->operstate)) {
r = link_acquire_conf(link);
if (r < 0)
return r;
diff --git a/src/network/networkd-network-gperf.gperf b/src/network/networkd-network-gperf.gperf
index 5038cb5..7ef467e 100644
--- a/src/network/networkd-network-gperf.gperf
+++ b/src/network/networkd-network-gperf.gperf
@@ -30,6 +30,7 @@ Network.Bond, config_parse_netdev, 0,
Network.VLAN, config_parse_netdev, 0, offsetof(Network, vlans)
Network.MACVLAN, config_parse_netdev, 0, offsetof(Network, macvlans)
Network.DHCP, config_parse_bool, 0, offsetof(Network, dhcp)
+Network.DHCPServer, config_parse_bool, 0, offsetof(Network, dhcp_server)
Network.IPv4LL, config_parse_bool, 0, offsetof(Network, ipv4ll)
Network.Address, config_parse_address, 0, 0
Network.Gateway, config_parse_gateway, 0, 0
diff --git a/src/network/networkd.h b/src/network/networkd.h
index cfe24f5..994c052 100644
--- a/src/network/networkd.h
+++ b/src/network/networkd.h
@@ -27,6 +27,7 @@
#include "sd-rtnl.h"
#include "sd-bus.h"
#include "sd-dhcp-client.h"
+#include "sd-dhcp-server.h"
#include "sd-ipv4ll.h"
#include "udev.h"
@@ -145,6 +146,8 @@ struct Network {
bool dhcp_critical;
bool ipv4ll;
+ bool dhcp_server;
+
LIST_HEAD(Address, static_addresses);
LIST_HEAD(Route, static_routes);
@@ -252,6 +255,8 @@ struct Link {
char *lease_file;
uint16_t original_mtu;
sd_ipv4ll *ipv4ll;
+
+ sd_dhcp_server *dhcp_server;
};
struct Manager {
--
1.9.0
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