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