C++ dev_net_set函数代码示例

static int ip6_tnl_init_net(struct net *net)
{
	struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
	int err;

	ip6n->tnls[0] = ip6n->tnls_wc;
	ip6n->tnls[1] = ip6n->tnls_r_l;

	err = -ENOMEM;
	ip6n->fb_tnl_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6tnl0",
				      ip6_tnl_dev_setup);

	if (!ip6n->fb_tnl_dev)
		goto err_alloc_dev;
	dev_net_set(ip6n->fb_tnl_dev, net);

	ip6_fb_tnl_dev_init(ip6n->fb_tnl_dev);

	err = register_netdev(ip6n->fb_tnl_dev);
	if (err < 0)
		goto err_register;
	return 0;

err_register:
	free_netdev(ip6n->fb_tnl_dev);
err_alloc_dev:
	return err;
}

/* Setup and register the loopback device. */
static __net_init int loopback_net_init(struct net *net)
{
	struct net_device *dev;
	int err;

	err = -ENOMEM;
	dev = alloc_netdev(0, "lo", loopback_setup);
	if (!dev)
		goto out;

	dev_net_set(dev, net);
	err = register_netdev(dev);
	if (err)
		goto out_free_netdev;

	net->loopback_dev = dev;
	return 0;


out_free_netdev:
	free_netdev(dev);
out:
	if (net == &init_net)
		panic("loopback: Failed to register netdevice: %d\n", err);
	return err;
}

static struct ip_tunnel * ipip6_tunnel_locate(struct net *net,
		struct ip_tunnel_parm *parms, int create)
{
	__be32 remote = parms->iph.daddr;
	__be32 local = parms->iph.saddr;
	struct ip_tunnel *t, **tp, *nt;
	struct net_device *dev;
	char name[IFNAMSIZ];
	struct sit_net *sitn = net_generic(net, sit_net_id);

	for (tp = __ipip6_bucket(sitn, parms); (t = *tp) != NULL; tp = &t->next) {
		if (local == t->parms.iph.saddr &&
		    remote == t->parms.iph.daddr &&
		    parms->link == t->parms.link) {
			if (create)
				return NULL;
			else
				return t;
		}
	}
	if (!create)
		goto failed;

	if (parms->name[0])
		strlcpy(name, parms->name, IFNAMSIZ);
	else
		sprintf(name, "sit%%d");

	dev = alloc_netdev(sizeof(*t), name, ipip6_tunnel_setup);
	if (dev == NULL)
		return NULL;

	dev_net_set(dev, net);

	if (strchr(name, '%')) {
		if (dev_alloc_name(dev, name) < 0)
			goto failed_free;
	}

	nt = netdev_priv(dev);

	nt->parms = *parms;
	ipip6_tunnel_init(dev);

	if (parms->i_flags & SIT_ISATAP)
		dev->priv_flags |= IFF_ISATAP;

	if (register_netdevice(dev) < 0)
		goto failed_free;

	dev_hold(dev);

	ipip6_tunnel_link(sitn, nt);
	return nt;

failed_free:
	free_netdev(dev);
failed:
	return NULL;
}

static struct net_device *ip6mr_reg_vif(struct net *net)
{
	struct net_device *dev;

	dev = alloc_netdev(0, "pim6reg", reg_vif_setup);
	if (dev == NULL)
		return NULL;

	dev_net_set(dev, net);

	if (register_netdevice(dev)) {
		free_netdev(dev);
		return NULL;
	}
	dev->iflink = 0;

	if (dev_open(dev))
		goto failure;

	dev_hold(dev);
	return dev;

failure:
	/* allow the register to be completed before unregistering. */
	rtnl_unlock();
	rtnl_lock();

	unregister_netdevice(dev);
	return NULL;
}

static int register_vlan_device(struct net_device *real_dev, u16 vlan_id)
{
	struct net_device *new_dev;
	struct net *net = dev_net(real_dev);
	struct vlan_net *vn = net_generic(net, vlan_net_id);
	char name[IFNAMSIZ];
	int err;

	if (vlan_id >= VLAN_VID_MASK)
		return -ERANGE;

	err = vlan_check_real_dev(real_dev, vlan_id);
	if (err < 0)
		return err;

	
	switch (vn->name_type) {
	case VLAN_NAME_TYPE_RAW_PLUS_VID:
		
		snprintf(name, IFNAMSIZ, "%s.%.4i", real_dev->name, vlan_id);
		break;
	case VLAN_NAME_TYPE_PLUS_VID_NO_PAD:
		snprintf(name, IFNAMSIZ, "vlan%i", vlan_id);
		break;
	case VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD:
		snprintf(name, IFNAMSIZ, "%s.%i", real_dev->name, vlan_id);
		break;
	case VLAN_NAME_TYPE_PLUS_VID:
	default:
		snprintf(name, IFNAMSIZ, "vlan%.4i", vlan_id);
	}

	new_dev = alloc_netdev(sizeof(struct vlan_dev_priv), name, vlan_setup);

	if (new_dev == NULL)
		return -ENOBUFS;

	dev_net_set(new_dev, net);
	new_dev->mtu = real_dev->mtu;

	vlan_dev_priv(new_dev)->vlan_id = vlan_id;
	vlan_dev_priv(new_dev)->real_dev = real_dev;
	vlan_dev_priv(new_dev)->dent = NULL;
	vlan_dev_priv(new_dev)->flags = VLAN_FLAG_REORDER_HDR;

	new_dev->rtnl_link_ops = &vlan_link_ops;
	err = register_vlan_dev(new_dev);
	if (err < 0)
		goto out_free_newdev;

	return 0;

out_free_newdev:
	free_netdev(new_dev);
	return err;
}

static struct vport *internal_dev_create(const struct vport_parms *parms)
{
	struct vport *vport;
	struct internal_dev *internal_dev;
	int err;

	vport = ovs_vport_alloc(0, &ovs_internal_vport_ops, parms);
	if (IS_ERR(vport)) {
		err = PTR_ERR(vport);
		goto error;
	}

	vport->dev = alloc_netdev(sizeof(struct internal_dev),
				  parms->name, NET_NAME_USER, do_setup);
	if (!vport->dev) {
		err = -ENOMEM;
		goto error_free_vport;
	}
	vport->dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
	if (!vport->dev->tstats) {
		err = -ENOMEM;
		goto error_free_netdev;
	}

#ifdef HAVE_IFF_PHONY_HEADROOM
	vport->dev->needed_headroom = vport->dp->max_headroom;
#endif
	dev_net_set(vport->dev, ovs_dp_get_net(vport->dp));
	internal_dev = internal_dev_priv(vport->dev);
	internal_dev->vport = vport;

	/* Restrict bridge port to current netns. */
	if (vport->port_no == OVSP_LOCAL)
		vport->dev->features |= NETIF_F_NETNS_LOCAL;

	rtnl_lock();
	err = register_netdevice(vport->dev);
	if (err)
		goto error_unlock;

	dev_set_promiscuity(vport->dev, 1);
	rtnl_unlock();
	netif_start_queue(vport->dev);

	return vport;

error_unlock:
	rtnl_unlock();
	free_percpu(vport->dev->tstats);
error_free_netdev:
	free_netdev(vport->dev);
error_free_vport:
	ovs_vport_free(vport);
error:
	return ERR_PTR(err);
}

static struct vport *internal_dev_create(const struct vport_parms *parms)
{
	struct vport *vport;
	struct netdev_vport *netdev_vport;
	struct internal_dev *internal_dev;
	int err;

	vport = ovs_vport_alloc(sizeof(struct netdev_vport),
				&ovs_internal_vport_ops, parms);
	if (IS_ERR(vport)) {
		err = PTR_ERR(vport);
		goto error;
	}

	netdev_vport = netdev_vport_priv(vport);

	netdev_vport->dev = alloc_netdev(sizeof(struct internal_dev),
					 parms->name, NET_NAME_UNKNOWN,
					 do_setup);
	if (!netdev_vport->dev) {
		err = -ENOMEM;
		goto error_free_vport;
	}

	dev_net_set(netdev_vport->dev, ovs_dp_get_net(vport->dp));
	internal_dev = internal_dev_priv(netdev_vport->dev);
	internal_dev->vport = vport;

	/* Restrict bridge port to current netns. */
	if (vport->port_no == OVSP_LOCAL)
		netdev_vport->dev->features |= NETIF_F_NETNS_LOCAL;

	rtnl_lock();
	err = register_netdevice(netdev_vport->dev);
	if (err)
		goto error_free_netdev;

	dev_set_promiscuity(netdev_vport->dev, 1);
	rtnl_unlock();
	netif_start_queue(netdev_vport->dev);

	return vport;

error_free_netdev:
	rtnl_unlock();
	free_netdev(netdev_vport->dev);
error_free_vport:
	ovs_vport_free(vport);
error:
	return ERR_PTR(err);
}

static struct ip_tunnel * ipgre_tunnel_locate(struct net *net,
		struct ip_tunnel_parm *parms, int create)
{
	struct ip_tunnel *t, *nt;
	struct net_device *dev;
	char name[IFNAMSIZ];
	struct ipgre_net *ign = net_generic(net, ipgre_net_id);

	t = ipgre_tunnel_find(net, parms, ARPHRD_IPGRE);
	if (t || !create)
		return t;

	if (parms->name[0])
		strlcpy(name, parms->name, IFNAMSIZ);
	else
		sprintf(name, "gre%%d");

	dev = alloc_netdev(sizeof(*t), name, ipgre_tunnel_setup);
	if (!dev)
	  return NULL;

	dev_net_set(dev, net);

	if (strchr(name, '%')) {
		if (dev_alloc_name(dev, name) < 0)
			goto failed_free;
	}

	nt = netdev_priv(dev);
	nt->parms = *parms;
	dev->rtnl_link_ops = &ipgre_link_ops;

	dev->mtu = ipgre_tunnel_bind_dev(dev);

	if (register_netdevice(dev) < 0)
		goto failed_free;

	dev_hold(dev);
	ipgre_tunnel_link(ign, nt);
	return nt;

failed_free:
	free_netdev(dev);
	return NULL;
}

static struct net_device *__ip_tunnel_create(struct net *net,
					     const struct rtnl_link_ops *ops,
					     struct ip_tunnel_parm *parms)
{
	int err;
	struct ip_tunnel *tunnel;
	struct net_device *dev;
	char name[IFNAMSIZ];

	if (parms->name[0])
		strlcpy(name, parms->name, IFNAMSIZ);
	else {
		if (strlen(ops->kind) > (IFNAMSIZ - 3)) {
			err = -E2BIG;
			goto failed;
		}
		strlcpy(name, ops->kind, IFNAMSIZ);
		strncat(name, "%d", 2);
	}

	ASSERT_RTNL();
	dev = alloc_netdev(ops->priv_size, name, ops->setup);
	if (!dev) {
		err = -ENOMEM;
		goto failed;
	}
	dev_net_set(dev, net);

	dev->rtnl_link_ops = ops;

	tunnel = netdev_priv(dev);
	tunnel->parms = *parms;
	tunnel->net = net;

	err = register_netdevice(dev);
	if (err)
		goto failed_free;

	return dev;

failed_free:
	free_netdev(dev);
failed:
	return ERR_PTR(err);
}

int qtnf_core_net_attach(struct qtnf_wmac *mac, struct qtnf_vif *vif,
			 const char *name, unsigned char name_assign_type,
			 enum nl80211_iftype iftype)
{
	struct wiphy *wiphy = priv_to_wiphy(mac);
	struct net_device *dev;
	void *qdev_vif;
	int ret;

	dev = alloc_netdev_mqs(sizeof(struct qtnf_vif *), name,
			       name_assign_type, ether_setup, 1, 1);
	if (!dev) {
		memset(&vif->wdev, 0, sizeof(vif->wdev));
		vif->wdev.iftype = NL80211_IFTYPE_UNSPECIFIED;
		return -ENOMEM;
	}

	vif->netdev = dev;

	dev->netdev_ops = &qtnf_netdev_ops;
	dev->needs_free_netdev = true;
	dev_net_set(dev, wiphy_net(wiphy));
	dev->ieee80211_ptr = &vif->wdev;
	dev->ieee80211_ptr->iftype = iftype;
	ether_addr_copy(dev->dev_addr, vif->mac_addr);
	SET_NETDEV_DEV(dev, wiphy_dev(wiphy));
	dev->flags |= IFF_BROADCAST | IFF_MULTICAST;
	dev->watchdog_timeo = QTNF_DEF_WDOG_TIMEOUT;
	dev->tx_queue_len = 100;

	qdev_vif = netdev_priv(dev);
	*((void **)qdev_vif) = vif;

	SET_NETDEV_DEV(dev, mac->bus->dev);

	ret = register_netdevice(dev);
	if (ret) {
		free_netdev(dev);
		vif->wdev.iftype = NL80211_IFTYPE_UNSPECIFIED;
	}

	return ret;
}

static struct net_device *ipmr_reg_vif(struct net *net)
{
	struct net_device *dev;
	struct in_device *in_dev;

	dev = alloc_netdev(0, "pimreg", reg_vif_setup);

	if (dev == NULL)
		return NULL;

	dev_net_set(dev, net);

	if (register_netdevice(dev)) {
		free_netdev(dev);
		return NULL;
	}
	dev->iflink = 0;

	rcu_read_lock();
	if ((in_dev = __in_dev_get_rcu(dev)) == NULL) {
		rcu_read_unlock();
		goto failure;
	}

	ipv4_devconf_setall(in_dev);
	IPV4_DEVCONF(in_dev->cnf, RP_FILTER) = 0;
	rcu_read_unlock();

	if (dev_open(dev))
		goto failure;

	dev_hold(dev);

	return dev;

failure:
	/* allow the register to be completed before unregistering. */
	rtnl_unlock();
	rtnl_lock();

	unregister_netdevice(dev);
	return NULL;
}

static int ip6_tnl_init_net(struct net *net)
{
	int err;
	struct ip6_tnl_net *ip6n;

	err = -ENOMEM;
	ip6n = kzalloc(sizeof(struct ip6_tnl_net), GFP_KERNEL);
	if (ip6n == NULL)
		goto err_alloc;

	err = net_assign_generic(net, ip6_tnl_net_id, ip6n);
	if (err < 0)
		goto err_assign;

	ip6n->tnls[0] = ip6n->tnls_wc;
	ip6n->tnls[1] = ip6n->tnls_r_l;

	err = -ENOMEM;
	ip6n->fb_tnl_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6tnl0",
				      ip6_tnl_dev_setup);

	if (!ip6n->fb_tnl_dev)
		goto err_alloc_dev;
	dev_net_set(ip6n->fb_tnl_dev, net);

	ip6_fb_tnl_dev_init(ip6n->fb_tnl_dev);

	err = register_netdev(ip6n->fb_tnl_dev);
	if (err < 0)
		goto err_register;
	return 0;

err_register:
	free_netdev(ip6n->fb_tnl_dev);
err_alloc_dev:
	/* nothing */
err_assign:
	kfree(ip6n);
err_alloc:
	return err;
}

static struct ip6_tnl *ip6_tnl_create(struct net *net, struct ip6_tnl_parm *p)
{
	struct net_device *dev;
	struct ip6_tnl *t;
	char name[IFNAMSIZ];
	int err;
	struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);

	if (p->name[0])
		strlcpy(name, p->name, IFNAMSIZ);
	else
		sprintf(name, "ip6tnl%%d");

	dev = alloc_netdev(sizeof (*t), name, ip6_tnl_dev_setup);
	if (dev == NULL)
		goto failed;

	dev_net_set(dev, net);

	if (strchr(name, '%')) {
		if (dev_alloc_name(dev, name) < 0)
			goto failed_free;
	}

	t = netdev_priv(dev);
	t->parms = *p;
	ip6_tnl_dev_init(dev);

	if ((err = register_netdevice(dev)) < 0)
		goto failed_free;

	dev_hold(dev);
	ip6_tnl_link(ip6n, t);
	return t;

failed_free:
	free_netdev(dev);
failed:
	return NULL;
}

/*  Attach a VLAN device to a mac address (ie Ethernet Card).
 *  Returns 0 if the device was created or a negative error code otherwise.
 */
static int register_vlan_device(struct net_device *real_dev, u16 vlan_id)
{
	struct net_device *new_dev;
	struct net *net = dev_net(real_dev);
	struct vlan_net *vn = net_generic(net, vlan_net_id);
	char name[IFNAMSIZ];
	int err;

	if (vlan_id >= VLAN_VID_MASK)
		return -ERANGE;

	err = vlan_check_real_dev(real_dev, vlan_id);
	if (err < 0)
		return err;

	/* Gotta set up the fields for the device. */
	switch (vn->name_type) {
	case VLAN_NAME_TYPE_RAW_PLUS_VID:
		/* name will look like:	 eth1.0005 */
		snprintf(name, IFNAMSIZ, "%s.%.4i", real_dev->name, vlan_id);
		break;
	case VLAN_NAME_TYPE_PLUS_VID_NO_PAD:
		/* Put our vlan.VID in the name.
		 * Name will look like:	 vlan5
		 */
		snprintf(name, IFNAMSIZ, "vlan%i", vlan_id);
		break;
	case VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD:
		/* Put our vlan.VID in the name.
		 * Name will look like:	 eth0.5
		 */
		snprintf(name, IFNAMSIZ, "%s.%i", real_dev->name, vlan_id);
		break;
	case VLAN_NAME_TYPE_PLUS_VID:
		/* Put our vlan.VID in the name.
		 * Name will look like:	 vlan0005
		 */
	default:
		snprintf(name, IFNAMSIZ, "vlan%.4i", vlan_id);
	}

	new_dev = alloc_netdev(sizeof(struct vlan_dev_priv), name, vlan_setup);

	if (new_dev == NULL)
		return -ENOBUFS;

	dev_net_set(new_dev, net);
	/* need 4 bytes for extra VLAN header info,
	 * hope the underlying device can handle it.
	 */
	new_dev->mtu = real_dev->mtu;
	new_dev->priv_flags |= (real_dev->priv_flags & IFF_UNICAST_FLT);

	vlan_dev_priv(new_dev)->vlan_id = vlan_id;
	vlan_dev_priv(new_dev)->real_dev = real_dev;
	vlan_dev_priv(new_dev)->dent = NULL;
	vlan_dev_priv(new_dev)->flags = VLAN_FLAG_REORDER_HDR;

	new_dev->rtnl_link_ops = &vlan_link_ops;
	err = register_vlan_dev(new_dev);
	if (err < 0)
		goto out_free_newdev;

	return 0;

out_free_newdev:
	free_netdev(new_dev);
	return err;
}

static int l2tp_eth_create(struct net *net, u32 tunnel_id, u32 session_id, u32 peer_session_id, struct l2tp_session_cfg *cfg)
{
	struct net_device *dev;
	char name[IFNAMSIZ];
	struct l2tp_tunnel *tunnel;
	struct l2tp_session *session;
	struct l2tp_eth *priv;
	struct l2tp_eth_sess *spriv;
	int rc;
	struct l2tp_eth_net *pn;

	tunnel = l2tp_tunnel_find(net, tunnel_id);
	if (!tunnel) {
		rc = -ENODEV;
		goto out;
	}

	session = l2tp_session_find(net, tunnel, session_id);
	if (session) {
		rc = -EEXIST;
		goto out;
	}

	if (cfg->ifname) {
		dev = dev_get_by_name(net, cfg->ifname);
		if (dev) {
			dev_put(dev);
			rc = -EEXIST;
			goto out;
		}
		strlcpy(name, cfg->ifname, IFNAMSIZ);
	} else
		strcpy(name, L2TP_ETH_DEV_NAME);

	session = l2tp_session_create(sizeof(*spriv), tunnel, session_id,
				      peer_session_id, cfg);
	if (!session) {
		rc = -ENOMEM;
		goto out;
	}

	dev = alloc_netdev(sizeof(*priv), name, l2tp_eth_dev_setup);
	if (!dev) {
		rc = -ENOMEM;
		goto out_del_session;
	}

	dev_net_set(dev, net);
	if (session->mtu == 0)
		session->mtu = dev->mtu - session->hdr_len;
	dev->mtu = session->mtu;
	dev->needed_headroom += session->hdr_len;

	priv = netdev_priv(dev);
	priv->dev = dev;
	priv->session = session;
	INIT_LIST_HEAD(&priv->list);

	priv->tunnel_sock = tunnel->sock;
	session->recv_skb = l2tp_eth_dev_recv;
	session->session_close = l2tp_eth_delete;
#if defined(CONFIG_L2TP_DEBUGFS) || defined(CONFIG_L2TP_DEBUGFS_MODULE)
	session->show = l2tp_eth_show;
#endif

	spriv = l2tp_session_priv(session);
	spriv->dev = dev;

	rc = register_netdev(dev);
	if (rc < 0)
		goto out_del_dev;

	__module_get(THIS_MODULE);
	/* Must be done after register_netdev() */
	strlcpy(session->ifname, dev->name, IFNAMSIZ);

	dev_hold(dev);
	pn = l2tp_eth_pernet(dev_net(dev));
	spin_lock(&pn->l2tp_eth_lock);
	list_add(&priv->list, &pn->l2tp_eth_dev_list);
	spin_unlock(&pn->l2tp_eth_lock);

	return 0;

out_del_dev:
	free_netdev(dev);
	spriv->dev = NULL;
out_del_session:
	l2tp_session_delete(session);
out:
	return rc;
}