cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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dp_notify.c (2033B)

      1// SPDX-License-Identifier: GPL-2.0-only
      2/*
      3 * Copyright (c) 2007-2012 Nicira, Inc.
      4 */
      5
      6#include <linux/netdevice.h>
      7#include <net/genetlink.h>
      8#include <net/netns/generic.h>
      9
     10#include "datapath.h"
     11#include "vport-internal_dev.h"
     12#include "vport-netdev.h"
     13
     14static void dp_detach_port_notify(struct vport *vport)
     15{
     16	struct sk_buff *notify;
     17	struct datapath *dp;
     18
     19	dp = vport->dp;
     20	notify = ovs_vport_cmd_build_info(vport, ovs_dp_get_net(dp),
     21					  0, 0, OVS_VPORT_CMD_DEL);
     22	ovs_dp_detach_port(vport);
     23	if (IS_ERR(notify)) {
     24		genl_set_err(&dp_vport_genl_family, ovs_dp_get_net(dp), 0,
     25			     0, PTR_ERR(notify));
     26		return;
     27	}
     28
     29	genlmsg_multicast_netns(&dp_vport_genl_family,
     30				ovs_dp_get_net(dp), notify, 0,
     31				0, GFP_KERNEL);
     32}
     33
     34void ovs_dp_notify_wq(struct work_struct *work)
     35{
     36	struct ovs_net *ovs_net = container_of(work, struct ovs_net, dp_notify_work);
     37	struct datapath *dp;
     38
     39	ovs_lock();
     40	list_for_each_entry(dp, &ovs_net->dps, list_node) {
     41		int i;
     42
     43		for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
     44			struct vport *vport;
     45			struct hlist_node *n;
     46
     47			hlist_for_each_entry_safe(vport, n, &dp->ports[i], dp_hash_node) {
     48				if (vport->ops->type == OVS_VPORT_TYPE_INTERNAL)
     49					continue;
     50
     51				if (!(netif_is_ovs_port(vport->dev)))
     52					dp_detach_port_notify(vport);
     53			}
     54		}
     55	}
     56	ovs_unlock();
     57}
     58
     59static int dp_device_event(struct notifier_block *unused, unsigned long event,
     60			   void *ptr)
     61{
     62	struct ovs_net *ovs_net;
     63	struct net_device *dev = netdev_notifier_info_to_dev(ptr);
     64	struct vport *vport = NULL;
     65
     66	if (!ovs_is_internal_dev(dev))
     67		vport = ovs_netdev_get_vport(dev);
     68
     69	if (!vport)
     70		return NOTIFY_DONE;
     71
     72	if (event == NETDEV_UNREGISTER) {
     73		/* upper_dev_unlink and decrement promisc immediately */
     74		ovs_netdev_detach_dev(vport);
     75
     76		/* schedule vport destroy, dev_put and genl notification */
     77		ovs_net = net_generic(dev_net(dev), ovs_net_id);
     78		queue_work(system_wq, &ovs_net->dp_notify_work);
     79	}
     80
     81	return NOTIFY_DONE;
     82}
     83
     84struct notifier_block ovs_dp_device_notifier = {
     85	.notifier_call = dp_device_event
     86};