diff options
Diffstat (limited to 'net/openvswitch/vport-netdev.c')
| -rw-r--r-- | net/openvswitch/vport-netdev.c | 211 |
1 files changed, 211 insertions, 0 deletions
diff --git a/net/openvswitch/vport-netdev.c b/net/openvswitch/vport-netdev.c new file mode 100644 index 000000000..57d6436e6 --- /dev/null +++ b/net/openvswitch/vport-netdev.c @@ -0,0 +1,211 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (c) 2007-2012 Nicira, Inc. + */ + +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + +#include <linux/if_arp.h> +#include <linux/if_bridge.h> +#include <linux/if_vlan.h> +#include <linux/kernel.h> +#include <linux/llc.h> +#include <linux/rtnetlink.h> +#include <linux/skbuff.h> +#include <linux/openvswitch.h> +#include <linux/export.h> + +#include <net/ip_tunnels.h> +#include <net/rtnetlink.h> + +#include "datapath.h" +#include "vport.h" +#include "vport-internal_dev.h" +#include "vport-netdev.h" + +static struct vport_ops ovs_netdev_vport_ops; + +/* Must be called with rcu_read_lock. */ +static void netdev_port_receive(struct sk_buff *skb) +{ + struct vport *vport; + + vport = ovs_netdev_get_vport(skb->dev); + if (unlikely(!vport)) + goto error; + + if (unlikely(skb_warn_if_lro(skb))) + goto error; + + /* Make our own copy of the packet. Otherwise we will mangle the + * packet for anyone who came before us (e.g. tcpdump via AF_PACKET). + */ + skb = skb_share_check(skb, GFP_ATOMIC); + if (unlikely(!skb)) + return; + + if (skb->dev->type == ARPHRD_ETHER) { + skb_push(skb, ETH_HLEN); + skb_postpush_rcsum(skb, skb->data, ETH_HLEN); + } + ovs_vport_receive(vport, skb, skb_tunnel_info(skb)); + return; +error: + kfree_skb(skb); +} + +/* Called with rcu_read_lock and bottom-halves disabled. */ +static rx_handler_result_t netdev_frame_hook(struct sk_buff **pskb) +{ + struct sk_buff *skb = *pskb; + + if (unlikely(skb->pkt_type == PACKET_LOOPBACK)) + return RX_HANDLER_PASS; + + netdev_port_receive(skb); + return RX_HANDLER_CONSUMED; +} + +static struct net_device *get_dpdev(const struct datapath *dp) +{ + struct vport *local; + + local = ovs_vport_ovsl(dp, OVSP_LOCAL); + return local->dev; +} + +struct vport *ovs_netdev_link(struct vport *vport, const char *name) +{ + int err; + + vport->dev = dev_get_by_name(ovs_dp_get_net(vport->dp), name); + if (!vport->dev) { + err = -ENODEV; + goto error_free_vport; + } + + if (vport->dev->flags & IFF_LOOPBACK || + (vport->dev->type != ARPHRD_ETHER && + vport->dev->type != ARPHRD_NONE) || + ovs_is_internal_dev(vport->dev)) { + err = -EINVAL; + goto error_put; + } + + rtnl_lock(); + err = netdev_master_upper_dev_link(vport->dev, + get_dpdev(vport->dp), + NULL, NULL, NULL); + if (err) + goto error_unlock; + + err = netdev_rx_handler_register(vport->dev, netdev_frame_hook, + vport); + if (err) + goto error_master_upper_dev_unlink; + + dev_disable_lro(vport->dev); + dev_set_promiscuity(vport->dev, 1); + vport->dev->priv_flags |= IFF_OVS_DATAPATH; + rtnl_unlock(); + + return vport; + +error_master_upper_dev_unlink: + netdev_upper_dev_unlink(vport->dev, get_dpdev(vport->dp)); +error_unlock: + rtnl_unlock(); +error_put: + dev_put(vport->dev); +error_free_vport: + ovs_vport_free(vport); + return ERR_PTR(err); +} +EXPORT_SYMBOL_GPL(ovs_netdev_link); + +static struct vport *netdev_create(const struct vport_parms *parms) +{ + struct vport *vport; + + vport = ovs_vport_alloc(0, &ovs_netdev_vport_ops, parms); + if (IS_ERR(vport)) + return vport; + + return ovs_netdev_link(vport, parms->name); +} + +static void vport_netdev_free(struct rcu_head *rcu) +{ + struct vport *vport = container_of(rcu, struct vport, rcu); + + if (vport->dev) + dev_put(vport->dev); + ovs_vport_free(vport); +} + +void ovs_netdev_detach_dev(struct vport *vport) +{ + ASSERT_RTNL(); + vport->dev->priv_flags &= ~IFF_OVS_DATAPATH; + netdev_rx_handler_unregister(vport->dev); + netdev_upper_dev_unlink(vport->dev, + netdev_master_upper_dev_get(vport->dev)); + dev_set_promiscuity(vport->dev, -1); +} + +static void netdev_destroy(struct vport *vport) +{ + rtnl_lock(); + if (netif_is_ovs_port(vport->dev)) + ovs_netdev_detach_dev(vport); + rtnl_unlock(); + + call_rcu(&vport->rcu, vport_netdev_free); +} + +void ovs_netdev_tunnel_destroy(struct vport *vport) +{ + rtnl_lock(); + if (netif_is_ovs_port(vport->dev)) + ovs_netdev_detach_dev(vport); + + /* We can be invoked by both explicit vport deletion and + * underlying netdev deregistration; delete the link only + * if it's not already shutting down. + */ + if (vport->dev->reg_state == NETREG_REGISTERED) + rtnl_delete_link(vport->dev); + dev_put(vport->dev); + vport->dev = NULL; + rtnl_unlock(); + + call_rcu(&vport->rcu, vport_netdev_free); +} +EXPORT_SYMBOL_GPL(ovs_netdev_tunnel_destroy); + +/* Returns null if this device is not attached to a datapath. */ +struct vport *ovs_netdev_get_vport(struct net_device *dev) +{ + if (likely(netif_is_ovs_port(dev))) + return (struct vport *) + rcu_dereference_rtnl(dev->rx_handler_data); + else + return NULL; +} + +static struct vport_ops ovs_netdev_vport_ops = { + .type = OVS_VPORT_TYPE_NETDEV, + .create = netdev_create, + .destroy = netdev_destroy, + .send = dev_queue_xmit, +}; + +int __init ovs_netdev_init(void) +{ + return ovs_vport_ops_register(&ovs_netdev_vport_ops); +} + +void ovs_netdev_exit(void) +{ + ovs_vport_ops_unregister(&ovs_netdev_vport_ops); +} |