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![Jesse Gross](/assets/img/avatar_default.png)
If an attempt is made to transmit a packet that is over the device's MTU then we log it using the datapath's name. However, it is much more helpful to use the device name instead. Signed-off-by: Jesse Gross <jesse@nicira.com>
198 lines
4.8 KiB
C
198 lines
4.8 KiB
C
/*
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* Copyright (c) 2007-2012 Nicira, Inc.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of version 2 of the GNU General Public
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* License as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301, USA
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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 <net/llc.h>
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#include "datapath.h"
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#include "vport-internal_dev.h"
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#include "vport-netdev.h"
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/* Must be called with rcu_read_lock. */
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static void netdev_port_receive(struct vport *vport, struct sk_buff *skb)
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{
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if (unlikely(!vport)) {
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kfree_skb(skb);
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return;
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}
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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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* (No one comes after us, since we tell handle_bridge() that we took
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* the packet.) */
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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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skb_push(skb, ETH_HLEN);
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ovs_vport_receive(vport, 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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struct vport *vport;
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if (unlikely(skb->pkt_type == PACKET_LOOPBACK))
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return RX_HANDLER_PASS;
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vport = ovs_netdev_get_vport(skb->dev);
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netdev_port_receive(vport, skb);
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return RX_HANDLER_CONSUMED;
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}
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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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struct netdev_vport *netdev_vport;
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int err;
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vport = ovs_vport_alloc(sizeof(struct netdev_vport),
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&ovs_netdev_vport_ops, parms);
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if (IS_ERR(vport)) {
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err = PTR_ERR(vport);
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goto error;
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}
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netdev_vport = netdev_vport_priv(vport);
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netdev_vport->dev = dev_get_by_name(ovs_dp_get_net(vport->dp), parms->name);
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if (!netdev_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 (netdev_vport->dev->flags & IFF_LOOPBACK ||
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netdev_vport->dev->type != ARPHRD_ETHER ||
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ovs_is_internal_dev(netdev_vport->dev)) {
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err = -EINVAL;
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goto error_put;
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}
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err = netdev_rx_handler_register(netdev_vport->dev, netdev_frame_hook,
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vport);
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if (err)
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goto error_put;
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dev_set_promiscuity(netdev_vport->dev, 1);
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netdev_vport->dev->priv_flags |= IFF_OVS_DATAPATH;
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return vport;
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error_put:
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dev_put(netdev_vport->dev);
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error_free_vport:
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ovs_vport_free(vport);
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error:
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return ERR_PTR(err);
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}
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static void netdev_destroy(struct vport *vport)
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{
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struct netdev_vport *netdev_vport = netdev_vport_priv(vport);
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netdev_vport->dev->priv_flags &= ~IFF_OVS_DATAPATH;
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netdev_rx_handler_unregister(netdev_vport->dev);
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dev_set_promiscuity(netdev_vport->dev, -1);
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synchronize_rcu();
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dev_put(netdev_vport->dev);
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ovs_vport_free(vport);
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}
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const char *ovs_netdev_get_name(const struct vport *vport)
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{
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const struct netdev_vport *netdev_vport = netdev_vport_priv(vport);
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return netdev_vport->dev->name;
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}
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int ovs_netdev_get_ifindex(const struct vport *vport)
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{
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const struct netdev_vport *netdev_vport = netdev_vport_priv(vport);
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return netdev_vport->dev->ifindex;
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}
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static unsigned int packet_length(const struct sk_buff *skb)
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{
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unsigned int length = skb->len - ETH_HLEN;
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if (skb->protocol == htons(ETH_P_8021Q))
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length -= VLAN_HLEN;
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return length;
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}
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static int netdev_send(struct vport *vport, struct sk_buff *skb)
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{
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struct netdev_vport *netdev_vport = netdev_vport_priv(vport);
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int mtu = netdev_vport->dev->mtu;
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int len;
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if (unlikely(packet_length(skb) > mtu && !skb_is_gso(skb))) {
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net_warn_ratelimited("%s: dropped over-mtu packet: %d > %d\n",
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netdev_vport->dev->name,
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packet_length(skb), mtu);
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goto error;
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}
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if (unlikely(skb_warn_if_lro(skb)))
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goto error;
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skb->dev = netdev_vport->dev;
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len = skb->len;
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dev_queue_xmit(skb);
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return len;
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error:
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kfree_skb(skb);
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ovs_vport_record_error(vport, VPORT_E_TX_DROPPED);
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return 0;
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}
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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(dev->priv_flags & IFF_OVS_DATAPATH))
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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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const 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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.get_name = ovs_netdev_get_name,
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.get_ifindex = ovs_netdev_get_ifindex,
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.send = netdev_send,
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};
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