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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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6.2 kB · 254 lines
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#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_rcsum(skb, 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, bool tunnel){ int err;
if (WARN_ON_ONCE(!vport->dev)) { err = -ENODEV; goto error_free_vport; }
rtnl_lock(); /* Do not link devices that are not registered to avoid a potential * race with the NETDEV_UNREGISTER notification in dp_device_event(). */ if (vport->dev->reg_state != NETREG_REGISTERED) { err = -ENODEV; goto error_put_unlock; }
err = netdev_master_upper_dev_link(vport->dev, get_dpdev(vport->dp), NULL, NULL, NULL); if (err) goto error_put_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_put_unlock: if (tunnel && vport->dev->reg_state == NETREG_REGISTERED) rtnl_delete_link(vport->dev, 0, NULL); netdev_put(vport->dev, &vport->dev_tracker); rtnl_unlock();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; int err;
vport = ovs_vport_alloc(0, &ovs_netdev_vport_ops, parms); if (IS_ERR(vport)) return vport;
vport->dev = dev_get_by_name(ovs_dp_get_net(vport->dp), parms->name); if (!vport->dev) { err = -ENODEV; goto error_free_vport; } netdev_tracker_alloc(vport->dev, &vport->dev_tracker, GFP_KERNEL);
/* Ensure that the provided name is not an alias. */ if (strcmp(parms->name, ovs_vport_name(vport))) { err = -ENODEV; goto error_put; }
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; }
return ovs_netdev_link(vport, false);error_put: netdev_put(vport->dev, &vport->dev_tracker);error_free_vport: ovs_vport_free(vport); return ERR_PTR(err);}
static void vport_netdev_free(struct rcu_head *rcu){ struct vport *vport = container_of(rcu, struct vport, rcu);
netdev_put(vport->dev, &vport->dev_tracker); ovs_vport_free(vport);}
void ovs_netdev_detach_dev(struct vport *vport){ ASSERT_RTNL(); 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);
/* paired with smp_mb() in netdev_destroy() */ smp_wmb();
vport->dev->priv_flags &= ~IFF_OVS_DATAPATH;}
static void netdev_destroy(struct vport *vport){ /* When called from ovs_db_notify_wq() after a dp_device_event(), the * port has already been detached, so we can avoid taking the RTNL by * checking this first. */ if (netif_is_ovs_port(vport->dev)) { rtnl_lock(); /* Check again while holding the lock to ensure we don't race * with the netdev notifier and detach twice. */ if (netif_is_ovs_port(vport->dev)) ovs_netdev_detach_dev(vport); rtnl_unlock(); }
/* paired with smp_wmb() in ovs_netdev_detach_dev() */ smp_mb();
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, 0, NULL);
/* We can't put the device reference yet, since it can still be in * use, but rtnl_unlock()->netdev_run_todo() will block until all * the references are released, so the RCU call must be before it. */ call_rcu(&vport->rcu, vport_netdev_free); rtnl_unlock();}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);}