+static int
+ksocknal_handle_link_state_change(struct net_device *dev,
+ unsigned char operstate)
+{
+ struct lnet_ni *ni = NULL;
+ struct ksock_net *net;
+ struct ksock_net *cnxt;
+ int ifindex;
+ unsigned char link_down;
+ struct in_device *in_dev;
+ bool found_ip = false;
+ struct ksock_interface *ksi = NULL;
+ struct sockaddr_in *sa;
+ __u32 ni_state_before;
+ bool update_ping_buf = false;
+ int state;
+ DECLARE_CONST_IN_IFADDR(ifa);
+
+ link_down = !((operstate == IF_OPER_UP) || (operstate == IF_OPER_UNKNOWN));
+ ifindex = dev->ifindex;
+
+ if (!ksocknal_data.ksnd_nnets)
+ goto out;
+
+ list_for_each_entry_safe(net, cnxt, &ksocknal_data.ksnd_nets,
+ ksnn_list) {
+
+ ksi = &net->ksnn_interface;
+ sa = (void *)&ksi->ksni_addr;
+ found_ip = false;
+
+ if (strcmp(ksi->ksni_name, dev->name))
+ continue;
+
+ if (ksi->ksni_index == -1) {
+ if (dev->reg_state != NETREG_REGISTERED)
+ continue;
+ /* A registration just happened: save the new index for
+ * the device */
+ ksi->ksni_index = ifindex;
+ goto out;
+ }
+
+ if (ksi->ksni_index != ifindex)
+ continue;
+
+ if (dev->reg_state == NETREG_UNREGISTERING) {
+ /* Device is being unregistered, we need to clear the
+ * index, it can change when device will be back */
+ ksi->ksni_index = -1;
+ goto out;
+ }
+
+ ni = net->ksnn_ni;
+
+ in_dev = __in_dev_get_rtnl(dev);
+ if (!in_dev) {
+ CDEBUG(D_NET, "Interface %s has no IPv4 status.\n",
+ dev->name);
+ ni_state_before = lnet_set_link_fatal_state(ni, 1);
+ goto ni_done;
+ }
+ in_dev_for_each_ifa_rtnl(ifa, in_dev) {
+ if (sa->sin_addr.s_addr == ifa->ifa_local)
+ found_ip = true;
+ }
+ endfor_ifa(in_dev);
+
+ if (!found_ip) {
+ CDEBUG(D_NET, "Interface %s has no matching ip\n",
+ dev->name);
+ ni_state_before = lnet_set_link_fatal_state(ni, 1);
+ goto ni_done;
+ }
+
+ if (link_down) {
+ ni_state_before = lnet_set_link_fatal_state(ni, 1);
+ } else {
+ state = (lnet_get_link_status(dev) == 0);
+ ni_state_before = lnet_set_link_fatal_state(ni,
+ state);
+ }
+ni_done:
+ if (!update_ping_buf &&
+ (ni->ni_state == LNET_NI_STATE_ACTIVE) &&
+ (atomic_read(&ni->ni_fatal_error_on) != ni_state_before))
+ update_ping_buf = true;
+ }
+
+ if (update_ping_buf)
+ lnet_mark_ping_buffer_for_update();
+out:
+ return 0;
+}
+
+
+static int
+ksocknal_handle_inetaddr_change(struct in_ifaddr *ifa, unsigned long event)
+{
+ struct lnet_ni *ni = NULL;
+ struct ksock_net *net;
+ struct ksock_net *cnxt;
+ struct net_device *event_netdev = ifa->ifa_dev->dev;
+ int ifindex;
+ struct ksock_interface *ksi = NULL;
+ struct sockaddr_in *sa;
+ __u32 ni_state_before;
+ bool update_ping_buf = false;
+ bool link_down;
+
+ if (!ksocknal_data.ksnd_nnets)
+ goto out;
+
+ ifindex = event_netdev->ifindex;
+
+ list_for_each_entry_safe(net, cnxt, &ksocknal_data.ksnd_nets,
+ ksnn_list) {
+
+ ksi = &net->ksnn_interface;
+ sa = (void *)&ksi->ksni_addr;
+
+ if (ksi->ksni_index != ifindex ||
+ strcmp(ksi->ksni_name, event_netdev->name))
+ continue;
+
+ if (sa->sin_addr.s_addr == ifa->ifa_local) {
+ ni = net->ksnn_ni;
+ link_down = (event == NETDEV_DOWN);
+ ni_state_before = lnet_set_link_fatal_state(ni,
+ link_down);
+
+ if (!update_ping_buf &&
+ (ni->ni_state == LNET_NI_STATE_ACTIVE) &&
+ ((event == NETDEV_DOWN) != ni_state_before))
+ update_ping_buf = true;
+ }
+ }
+
+ if (update_ping_buf)
+ lnet_mark_ping_buffer_for_update();
+out:
+ return 0;
+}
+
+/************************************
+ * Net device notifier event handler
+ ************************************/
+static int ksocknal_device_event(struct notifier_block *unused,
+ unsigned long event, void *ptr)
+{
+ struct net_device *dev = netdev_notifier_info_to_dev(ptr);
+ unsigned char operstate;
+
+ operstate = dev->operstate;
+
+ CDEBUG(D_NET, "devevent: status=%ld, iface=%s ifindex %d state %u\n",
+ event, dev->name, dev->ifindex, operstate);
+
+ switch (event) {
+ case NETDEV_UP:
+ case NETDEV_DOWN:
+ case NETDEV_CHANGE:
+ case NETDEV_REGISTER:
+ case NETDEV_UNREGISTER:
+ ksocknal_handle_link_state_change(dev, operstate);
+ break;
+ }
+
+ return NOTIFY_OK;
+}
+
+/************************************
+ * Inetaddr notifier event handler
+ ************************************/
+static int ksocknal_inetaddr_event(struct notifier_block *unused,
+ unsigned long event, void *ptr)
+{
+ struct in_ifaddr *ifa = ptr;
+
+ CDEBUG(D_NET, "addrevent: status %ld ip addr %pI4, netmask %pI4.\n",
+ event, &ifa->ifa_address, &ifa->ifa_mask);
+
+ switch (event) {
+ case NETDEV_UP:
+ case NETDEV_DOWN:
+ case NETDEV_CHANGE:
+ ksocknal_handle_inetaddr_change(ifa, event);
+ break;
+
+ }
+ return NOTIFY_OK;
+}
+
+static struct notifier_block ksocknal_dev_notifier_block = {
+ .notifier_call = ksocknal_device_event,
+};
+
+static struct notifier_block ksocknal_inetaddr_notifier_block = {
+ .notifier_call = ksocknal_inetaddr_event,
+};
+