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-rw-r--r--src/network/networkd-gperf.gperf1
-rw-r--r--src/network/networkd-link.c246
-rw-r--r--src/network/networkd.h10
3 files changed, 236 insertions, 21 deletions
diff --git a/src/network/networkd-gperf.gperf b/src/network/networkd-gperf.gperf
index f710df6bf6..f1594d56c9 100644
--- a/src/network/networkd-gperf.gperf
+++ b/src/network/networkd-gperf.gperf
@@ -22,6 +22,7 @@ Match.Type, config_parse_string, 0, offsetof(Networ
Match.Name, config_parse_ifname, 0, offsetof(Network, match_name)
Network.Description, config_parse_string, 0, offsetof(Network, description)
Network.Bridge, config_parse_bridge, 0, offsetof(Network, bridge)
+Network.DHCP, config_parse_bool, 0, offsetof(Network, dhcp)
Network.Address, config_parse_address, 0, 0
Network.Gateway, config_parse_gateway, 0, 0
Address.Address, config_parse_address, 0, 0
diff --git a/src/network/networkd-link.c b/src/network/networkd-link.c
index ea94966f18..3d01625d71 100644
--- a/src/network/networkd-link.c
+++ b/src/network/networkd-link.c
@@ -73,6 +73,15 @@ void link_free(Link *link) {
assert(link->manager);
+ if (link->dhcp)
+ sd_dhcp_client_free(link->dhcp);
+
+ route_free(link->dhcp_route);
+ link->dhcp_route = NULL;
+
+ address_free(link->dhcp_address);
+ link->dhcp_address = NULL;
+
hashmap_remove(link->manager->links, &link->ifindex);
free(link->ifname);
@@ -140,10 +149,12 @@ static int route_handler(sd_rtnl *rtnl, sd_rtnl_message *m, void *userdata) {
Link *link = userdata;
int r;
- assert(link->rtnl_messages > 0);
- assert(link->state == LINK_STATE_SETTING_ROUTES || link->state == LINK_STATE_FAILED);
+ assert(link->route_messages > 0);
+ assert(link->state == LINK_STATE_SETTING_ADDRESSES ||
+ link->state == LINK_STATE_SETTING_ROUTES ||
+ link->state == LINK_STATE_FAILED);
- link->rtnl_messages --;
+ link->route_messages --;
if (link->state == LINK_STATE_FAILED)
return 1;
@@ -153,7 +164,9 @@ static int route_handler(sd_rtnl *rtnl, sd_rtnl_message *m, void *userdata) {
log_warning("Could not set route on interface '%s': %s",
link->ifname, strerror(-r));
- if (link->rtnl_messages == 0) {
+ /* we might have received an old reply after moving back to SETTING_ADDRESSES,
+ * ignore it */
+ if (link->route_messages == 0 && link->state == LINK_STATE_SETTING_ROUTES) {
log_info("Routes set for link '%s'", link->ifname);
link_enter_configured(link);
}
@@ -167,12 +180,11 @@ static int link_enter_set_routes(Link *link) {
assert(link);
assert(link->network);
- assert(link->rtnl_messages == 0);
assert(link->state == LINK_STATE_SETTING_ADDRESSES);
link->state = LINK_STATE_SETTING_ROUTES;
- if (!link->network->static_routes)
+ if (!link->network->static_routes && !link->dhcp_route)
return link_enter_configured(link);
LIST_FOREACH(static_routes, route, link->network->static_routes) {
@@ -183,7 +195,18 @@ static int link_enter_set_routes(Link *link) {
return r;
}
- link->rtnl_messages ++;
+ link->route_messages ++;
+ }
+
+ if (link->dhcp_route) {
+ r = route_configure(link->dhcp_route, link, &route_handler);
+ if (r < 0) {
+ log_warning("Could not set routes for link '%s'", link->ifname);
+ link_enter_failed(link);
+ return r;
+ }
+
+ link->route_messages ++;
}
return 0;
@@ -193,10 +216,13 @@ static int address_handler(sd_rtnl *rtnl, sd_rtnl_message *m, void *userdata) {
Link *link = userdata;
int r;
- assert(link->rtnl_messages > 0);
+ assert(m);
+ assert(link);
+ assert(link->ifname);
+ assert(link->addr_messages > 0);
assert(link->state == LINK_STATE_SETTING_ADDRESSES || link->state == LINK_STATE_FAILED);
- link->rtnl_messages --;
+ link->addr_messages --;
if (link->state == LINK_STATE_FAILED)
return 1;
@@ -206,7 +232,7 @@ static int address_handler(sd_rtnl *rtnl, sd_rtnl_message *m, void *userdata) {
log_warning("Could not set address on interface '%s': %s",
link->ifname, strerror(-r));
- if (link->rtnl_messages == 0) {
+ if (link->addr_messages == 0) {
log_info("Addresses set for link '%s'", link->ifname);
link_enter_set_routes(link);
}
@@ -220,12 +246,11 @@ static int link_enter_set_addresses(Link *link) {
assert(link);
assert(link->network);
- assert(link->state == LINK_STATE_JOINING_BRIDGE);
- assert(link->rtnl_messages == 0);
+ assert(link->state != _LINK_STATE_INVALID);
link->state = LINK_STATE_SETTING_ADDRESSES;
- if (!link->network->static_addresses)
+ if (!link->network->static_addresses && !link->dhcp_address)
return link_enter_set_routes(link);
LIST_FOREACH(static_addresses, address, link->network->static_addresses) {
@@ -236,7 +261,18 @@ static int link_enter_set_addresses(Link *link) {
return r;
}
- link->rtnl_messages ++;
+ link->addr_messages ++;
+ }
+
+ if (link->dhcp_address) {
+ r = address_configure(link->dhcp_address, link, &address_handler);
+ if (r < 0) {
+ log_warning("Could not set addresses for link '%s'", link->ifname);
+ link_enter_failed(link);
+ return r;
+ }
+
+ link->addr_messages ++;
}
return 0;
@@ -290,6 +326,7 @@ static int link_bridge_joined(Link *link) {
assert(link);
assert(link->state == LINK_STATE_JOINING_BRIDGE);
+ assert(link->network);
r = link_up(link);
if (r < 0) {
@@ -297,10 +334,11 @@ static int link_bridge_joined(Link *link) {
return r;
}
- r = link_enter_set_addresses(link);
- if (r < 0) {
- link_enter_failed(link);
- return r;
+ if (!link->network->dhcp) {
+ r = link_enter_set_addresses(link);
+ if (r < 0)
+ link_enter_failed(link);
+ return r;
}
return 0;
@@ -411,6 +449,157 @@ int link_configure(Link *link) {
return 0;
}
+static int address_drop_handler(sd_rtnl *rtnl, sd_rtnl_message *m, void *userdata) {
+ Link *link = userdata;
+ int r;
+
+ assert(m);
+ assert(link);
+ assert(link->ifname);
+
+ if (link->state == LINK_STATE_FAILED)
+ return 1;
+
+ r = sd_rtnl_message_get_errno(m);
+ if (r < 0 && r != -EEXIST)
+ log_warning("Could not drop address from interface '%s': %s",
+ link->ifname, strerror(-r));
+
+ return 1;
+}
+
+static void dhcp_handler(sd_dhcp_client *client, int event, void *userdata) {
+ Link *link = userdata;
+ struct in_addr address;
+ struct in_addr netmask;
+ struct in_addr gateway;
+ int prefixlen;
+ int r;
+
+ if (link->state == LINK_STATE_FAILED)
+ return;
+
+ if (event < 0) {
+ log_warning("DHCP error: %s", strerror(-event));
+ link_enter_failed(link);
+ return;
+ }
+
+ if (event == DHCP_EVENT_NO_LEASE)
+ log_info("IP address in use.");
+
+ if (event == DHCP_EVENT_IP_CHANGE || event == DHCP_EVENT_EXPIRED ||
+ event == DHCP_EVENT_STOP) {
+ address_drop(link->dhcp_address, link, address_drop_handler);
+
+ address_free(link->dhcp_address);
+ link->dhcp_address = NULL;
+
+ route_free(link->dhcp_route);
+ link->dhcp_route = NULL;
+ }
+
+ r = sd_dhcp_client_get_address(client, &address);
+ if (r < 0) {
+ log_warning("DHCP error: no address");
+ link_enter_failed(link);
+ return;
+ }
+
+ r = sd_dhcp_client_get_netmask(client, &netmask);
+ if (r < 0) {
+ log_warning("DHCP error: no netmask");
+ link_enter_failed(link);
+ return;
+ }
+
+ prefixlen = sd_dhcp_client_prefixlen(&netmask);
+ if (prefixlen < 0) {
+ log_warning("DHCP error: no prefixlen");
+ link_enter_failed(link);
+ return;
+ }
+
+ r = sd_dhcp_client_get_router(client, &gateway);
+ if (r < 0) {
+ log_warning("DHCP error: no router");
+ link_enter_failed(link);
+ return;
+ }
+
+ if (event == DHCP_EVENT_IP_CHANGE || event == DHCP_EVENT_IP_ACQUIRE) {
+ _cleanup_address_free_ Address *addr = NULL;
+ _cleanup_route_free_ Route *rt = NULL;
+
+ log_info("Received config over DHCPv4");
+
+ r = address_new_dynamic(&addr);
+ if (r < 0) {
+ log_error("Could not allocate address");
+ link_enter_failed(link);
+ return;
+ }
+
+ addr->family = AF_INET;
+ addr->in_addr.in = address;
+ addr->prefixlen = prefixlen;
+ addr->netmask = netmask;
+
+ r = route_new_dynamic(&rt);
+ if (r < 0) {
+ log_error("Could not allocate route");
+ link_enter_failed(link);
+ return;
+ }
+
+ rt->family = AF_INET;
+ rt->in_addr.in = gateway;
+
+ link->dhcp_address = addr;
+ link->dhcp_route = rt;
+ addr = NULL;
+ rt = NULL;
+
+ link_enter_set_addresses(link);
+ }
+
+ return;
+}
+
+static int link_acquire_conf(Link *link) {
+ int r;
+
+ assert(link);
+ assert(link->network);
+ assert(link->network->dhcp);
+ assert(link->manager);
+ assert(link->manager->event);
+
+ if (!link->dhcp) {
+ link->dhcp = sd_dhcp_client_new(link->manager->event);
+ if (!link->dhcp)
+ return -ENOMEM;
+
+ r = sd_dhcp_client_set_index(link->dhcp, link->ifindex);
+ if (r < 0)
+ return r;
+
+ r = sd_dhcp_client_set_mac(link->dhcp, &link->mac);
+ if (r < 0)
+ return r;
+
+ r = sd_dhcp_client_set_callback(link->dhcp, dhcp_handler, link);
+ if (r < 0)
+ return r;
+ }
+
+ r = sd_dhcp_client_start(link->dhcp);
+ if (r < 0)
+ return r;
+
+ return 0;
+}
+
int link_update(Link *link, sd_rtnl_message *m) {
unsigned flags;
int r;
@@ -429,11 +618,28 @@ int link_update(Link *link, sd_rtnl_message *m) {
else if (!(link->flags & IFF_UP) && flags & IFF_UP)
log_info("Interface '%s' is up", link->ifname);
- if (link->flags & IFF_LOWER_UP && !(flags & IFF_LOWER_UP))
+ if (link->flags & IFF_LOWER_UP && !(flags & IFF_LOWER_UP)) {
log_info("Interface '%s' is disconnected", link->ifname);
- else if (!(link->flags & IFF_LOWER_UP) && flags & IFF_LOWER_UP)
+
+ if (link->network->dhcp) {
+ r = sd_dhcp_client_stop(link->dhcp);
+ if (r < 0) {
+ link_enter_failed(link);
+ return r;
+ }
+ }
+ } else if (!(link->flags & IFF_LOWER_UP) && flags & IFF_LOWER_UP) {
log_info("Interface '%s' is connected", link->ifname);
+ if (link->network->dhcp) {
+ r = link_acquire_conf(link);
+ if (r < 0) {
+ link_enter_failed(link);
+ return r;
+ }
+ }
+ }
+
link->flags = flags;
return 0;
diff --git a/src/network/networkd.h b/src/network/networkd.h
index 547533fbab..cad81d9b71 100644
--- a/src/network/networkd.h
+++ b/src/network/networkd.h
@@ -26,6 +26,7 @@
#include "sd-event.h"
#include "sd-rtnl.h"
+#include "sd-dhcp-client.h"
#include "udev.h"
#include "rtnl-util.h"
@@ -84,6 +85,7 @@ struct Network {
char *description;
Bridge *bridge;
+ bool dhcp;
LIST_HEAD(Address, static_addresses);
LIST_HEAD(Route, static_routes);
@@ -153,9 +155,15 @@ struct Link {
Network *network;
+ Route *dhcp_route;
+ Address *dhcp_address;
+
LinkState state;
- unsigned rtnl_messages;
+ unsigned addr_messages;
+ unsigned route_messages;
+
+ sd_dhcp_client *dhcp;
};
struct Manager {
generated by cgit v1.2.3-54-g00ecf (git 2.45.2) at 2024-12-12 14:31:32 +0000