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networkd: netdev - reduce chance of race when receiving netdev's ifindex
[elogind.git] / src / network / networkd-link.c
diff --git a/src/network/networkd-link.c b/src/network/networkd-link.c
index f1c2889ba4992cca66bb28c922705a53c529b9e7..363602e9623538effcb2d2d72e795db8f73f89f7 100644 (file)
--- a/src/network/networkd-link.c
+++ b/src/network/networkd-link.c
@@ -26,6 +26,7 @@
 #include "libudev-private.h"
 #include "util.h"
 #include "bus-util.h"
+#include "net-util.h"
 
 int link_new(Manager *manager, struct udev_device *device, Link **ret) {
         _cleanup_link_free_ Link *link = NULL;
@@ -95,7 +96,6 @@ int link_add(Manager *m, struct udev_device *device, Link **ret) {
         Network *network;
         int r;
         uint64_t ifindex;
-        const char *devtype;
 
         assert(m);
         assert(device);
@@ -113,13 +113,6 @@ int link_add(Manager *m, struct udev_device *device, Link **ret) {
 
         *ret = link;
 
-        devtype = udev_device_get_devtype(device);
-        if (streq_ptr(devtype, "bridge")) {
-                r = bridge_set_link(m, link);
-                if (r < 0 && r != -ENOENT)
-                        return r;
-        }
-
         r = network_get(m, device, &network);
         if (r < 0)
                 return r == -ENOENT ? 0 : r;
@@ -166,7 +159,11 @@ static int route_handler(sd_rtnl *rtnl, sd_rtnl_message *m, void *userdata) {
 
         r = sd_rtnl_message_get_errno(m);
         if (r < 0 && r != -EEXIST)
-                log_warning_link(link, "could not set route: %s", strerror(-r));
+                log_struct_link(LOG_WARNING, link,
+                                "MESSAGE=%s: could not set route: %s",
+                                link->ifname, strerror(-r),
+                                "ERRNO=%d", -r,
+                                NULL);
 
         /* we might have received an old reply after moving back to SETTING_ADDRESSES,
          * ignore it */
@@ -237,7 +234,7 @@ static int address_handler(sd_rtnl *rtnl, sd_rtnl_message *m, void *userdata) {
 
         r = sd_rtnl_message_get_errno(m);
         if (r < 0 && r != -EEXIST)
-                log_struct_link(LOG_ERR, link,
+                log_struct_link(LOG_WARNING, link,
                                 "MESSAGE=%s: could not set address: %s",
                                 link->ifname, strerror(-r),
                                 "ERRNO=%d", -r,
@@ -305,8 +302,12 @@ static int address_drop_handler(sd_rtnl *rtnl, sd_rtnl_message *m, void *userdat
                 return 1;
 
         r = sd_rtnl_message_get_errno(m);
-        if (r < 0 && r != -EEXIST)
-                log_warning_link(link, "could not drop address: %s", strerror(-r));
+        if (r < 0 && r != -ENOENT)
+                log_struct_link(LOG_WARNING, link,
+                                "MESSAGE=%s: could not drop address: %s",
+                                link->ifname, strerror(-r),
+                                "ERRNO=%d", -r,
+                                NULL);
 
         return 1;
 }
@@ -367,8 +368,12 @@ static int set_mtu_handler(sd_rtnl *rtnl, sd_rtnl_message *m, void *userdata) {
                 return 1;
 
         r = sd_rtnl_message_get_errno(m);
-        if (r < 0 && r != -EEXIST)
-                log_warning_link(link, "Could not set MTU: %s", strerror(-r));
+        if (r < 0)
+                log_struct_link(LOG_WARNING, link,
+                                "MESSAGE=%s: could not set MTU: %s",
+                                link->ifname, strerror(-r),
+                                "ERRNO=%d", -r,
+                                NULL);
 
         return 1;
 }
@@ -410,7 +415,7 @@ static void dhcp_handler(sd_dhcp_client *client, int event, void *userdata) {
         struct in_addr address;
         struct in_addr netmask;
         struct in_addr gateway;
-        int prefixlen;
+        unsigned prefixlen;
         int r;
 
         assert(link);
@@ -431,6 +436,12 @@ static void dhcp_handler(sd_dhcp_client *client, int event, void *userdata) {
 
         if (event == DHCP_EVENT_IP_CHANGE || event == DHCP_EVENT_EXPIRED ||
             event == DHCP_EVENT_STOP) {
+                if (link->network->dhcp_critical) {
+                        log_warning_link(link, "DHCPv4 connection considered system critical, "
+                                         "ignoring request to reconfigure it down.");
+                        return;
+                }
+
                 if (link->dhcp_address) {
                         address_drop(link->dhcp_address, link, address_drop_handler);
 
@@ -478,12 +489,7 @@ static void dhcp_handler(sd_dhcp_client *client, int event, void *userdata) {
                 return;
         }
 
-        prefixlen = sd_dhcp_client_prefixlen(&netmask);
-        if (prefixlen < 0) {
-                log_warning_link(link, "DHCP error: no prefixlen");
-                link_enter_failed(link);
-                return;
-        }
+        prefixlen = net_netmask_to_prefixlen(&netmask);
 
         r = sd_dhcp_client_get_router(client, &gateway);
         if (r < 0) {
@@ -522,7 +528,7 @@ static void dhcp_handler(sd_dhcp_client *client, int event, void *userdata) {
                 addr->family = AF_INET;
                 addr->in_addr.in = address;
                 addr->prefixlen = prefixlen;
-                addr->netmask = netmask;
+                addr->broadcast.s_addr = address.s_addr | ~netmask.s_addr;
 
                 r = route_new_dynamic(&rt);
                 if (r < 0) {
@@ -687,9 +693,13 @@ static int link_up_handler(sd_rtnl *rtnl, sd_rtnl_message *m, void *userdata) {
 
         r = sd_rtnl_message_get_errno(m);
         if (r < 0) {
-                log_warning_link(link,
-                                 "could not bring up interface: %s", strerror(-r));
+                log_struct_link(LOG_ERR, link,
+                                "MESSAGE=%s: could not bring up interface: %s",
+                                link->ifname, strerror(-r),
+                                "ERRNO=%d", -r,
+                                NULL);
                 link_enter_failed(link);
+                return 1;
         }
 
         link_update_flags(link, link->flags | IFF_UP);
@@ -713,7 +723,7 @@ static int link_up(Link *link) {
                 return r;
         }
 
-        r = sd_rtnl_message_link_set_flags(req, IFF_UP);
+        r = sd_rtnl_message_link_set_flags(req, IFF_UP, IFF_UP);
         if (r < 0) {
                 log_error_link(link, "Could not set link flags: %s", strerror(-r));
                 return r;
@@ -729,11 +739,11 @@ static int link_up(Link *link) {
         return 0;
 }
 
-static int link_bridge_joined(Link *link) {
+static int link_enslaved(Link *link) {
         int r;
 
         assert(link);
-        assert(link->state == LINK_STATE_JOINING_BRIDGE);
+        assert(link->state == LINK_STATE_ENSLAVING);
         assert(link->network);
 
         r = link_up(link);
@@ -748,67 +758,90 @@ static int link_bridge_joined(Link *link) {
         return 0;
 }
 
-static int bridge_handler(sd_rtnl *rtnl, sd_rtnl_message *m, void *userdata) {
+static int enslave_handler(sd_rtnl *rtnl, sd_rtnl_message *m, void *userdata) {
         Link *link = userdata;
         int r;
 
         assert(link);
-        assert(link->state == LINK_STATE_JOINING_BRIDGE || link->state == LINK_STATE_FAILED);
+        assert(link->state == LINK_STATE_ENSLAVING || link->state == LINK_STATE_FAILED);
         assert(link->network);
 
+        link->enslaving --;
+
         if (link->state == LINK_STATE_FAILED)
                 return 1;
 
         r = sd_rtnl_message_get_errno(m);
         if (r < 0) {
                 log_struct_link(LOG_ERR, link,
-                                "MESSAGE=%s: could not join bridge '%s': %s",
-                                link->ifname, link->network->bridge->name, strerror(-r),
-                                BRIDGE(link->network->bridge),
+                                "MESSAGE=%s: could not enslave: %s",
+                                link->ifname, strerror(-r),
+                                "ERRNO=%d", -r,
                                 NULL);
                 link_enter_failed(link);
                 return 1;
         }
 
-        log_struct_link(LOG_DEBUG, link,
-                        "MESSAGE=%s: joined bridge '%s'",
-                        link->network->bridge->name,
-                        BRIDGE(link->network->bridge),
-                        NULL);
+        log_debug_link(link, "enslaved");
 
-        link_bridge_joined(link);
+        if (link->enslaving == 0)
+                link_enslaved(link);
 
         return 1;
 }
 
-static int link_enter_join_bridge(Link *link) {
+static int link_enter_enslave(Link *link) {
         int r;
 
         assert(link);
         assert(link->network);
         assert(link->state == _LINK_STATE_INVALID);
 
-        link->state = LINK_STATE_JOINING_BRIDGE;
+        link->state = LINK_STATE_ENSLAVING;
 
-        if (!link->network->bridge)
-                return link_bridge_joined(link);
+        if (!link->network->bridge && !link->network->bond && !link->network->vlan)
+                return link_enslaved(link);
 
-        log_struct_link(LOG_DEBUG, link,
-                        "MESSAGE=%s: joining bridge '%s'",
-                        link->network->bridge->name,
-                        BRIDGE(link->network->bridge),
-                        NULL);
-        log_debug_link(link, "joining bridge");
+        if (link->network->bridge) {
+                log_struct_link(LOG_DEBUG, link,
+                                "MESSAGE=%s: enslaving by '%s'",
+                                link->ifname, link->network->bridge->name,
+                                NETDEV(link->network->bridge),
+                                NULL);
 
-        r = bridge_join(link->network->bridge, link, &bridge_handler);
-        if (r < 0) {
-                log_struct_link(LOG_WARNING, link,
-                                "MESSAGE=%s: could not join bridge '%s': %s",
-                                link->network->bridge->name, strerror(-r),
-                                BRIDGE(link->network->bridge),
+                r = netdev_enslave(link->network->bridge, link, &enslave_handler);
+                if (r < 0) {
+                        log_struct_link(LOG_WARNING, link,
+                                        "MESSAGE=%s: could not enslave by '%s': %s",
+                                        link->ifname, link->network->bridge->name, strerror(-r),
+                                        NETDEV(link->network->bridge),
+                                        NULL);
+                        link_enter_failed(link);
+                        return r;
+                }
+
+                link->enslaving ++;
+        }
+
+        if (link->network->vlan) {
+                log_struct_link(LOG_DEBUG, link,
+                                "MESSAGE=%s: enslaving by '%s'",
+                                link->ifname, link->network->vlan->name,
+                                NETDEV(link->network->vlan),
                                 NULL);
-                link_enter_failed(link);
-                return r;
+
+                r = netdev_enslave(link->network->vlan, link, &enslave_handler);
+                if (r < 0) {
+                        log_struct_link(LOG_WARNING, link,
+                                        "MESSAGE=%s: could not enslave by '%s': %s",
+                                        link->ifname, link->network->vlan->name,
+                                        strerror(-r), NETDEV(link->network->vlan),
+                                        NULL);
+                        link_enter_failed(link);
+                        return r;
+                }
+
+                link->enslaving ++;
         }
 
         return 0;
@@ -825,8 +858,13 @@ static int link_get_handler(sd_rtnl *rtnl, sd_rtnl_message *m, void *userdata) {
 
         r = sd_rtnl_message_get_errno(m);
         if (r < 0) {
-                log_warning_link(link, "could not get state: %s", strerror(-r));
+                log_struct_link(LOG_ERR, link,
+                                "MESSAGE=%s: could not get state: %s",
+                                link->ifname, strerror(-r),
+                                "ERRNO=%d", -r,
+                                NULL);
                 link_enter_failed(link);
+                return 1;
         }
 
         log_debug_link(link, "got link state");
@@ -875,7 +913,7 @@ int link_configure(Link *link) {
                 return r;
         }
 
-        return link_enter_join_bridge(link);
+        return link_enter_enslave(link);
 }
 
 int link_update(Link *link, sd_rtnl_message *m) {
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