linux/net/openvswitch/vport-netdev.c
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   1/*
   2 * Copyright (c) 2007-2012 Nicira, Inc.
   3 *
   4 * This program is free software; you can redistribute it and/or
   5 * modify it under the terms of version 2 of the GNU General Public
   6 * License as published by the Free Software Foundation.
   7 *
   8 * This program is distributed in the hope that it will be useful, but
   9 * WITHOUT ANY WARRANTY; without even the implied warranty of
  10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  11 * General Public License for more details.
  12 *
  13 * You should have received a copy of the GNU General Public License
  14 * along with this program; if not, write to the Free Software
  15 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  16 * 02110-1301, USA
  17 */
  18
  19#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  20
  21#include <linux/if_arp.h>
  22#include <linux/if_bridge.h>
  23#include <linux/if_vlan.h>
  24#include <linux/kernel.h>
  25#include <linux/llc.h>
  26#include <linux/rtnetlink.h>
  27#include <linux/skbuff.h>
  28
  29#include <net/llc.h>
  30
  31#include "datapath.h"
  32#include "vport-internal_dev.h"
  33#include "vport-netdev.h"
  34
  35/* Must be called with rcu_read_lock. */
  36static void netdev_port_receive(struct vport *vport, struct sk_buff *skb)
  37{
  38        if (unlikely(!vport)) {
  39                kfree_skb(skb);
  40                return;
  41        }
  42
  43        /* Make our own copy of the packet.  Otherwise we will mangle the
  44         * packet for anyone who came before us (e.g. tcpdump via AF_PACKET).
  45         * (No one comes after us, since we tell handle_bridge() that we took
  46         * the packet.) */
  47        skb = skb_share_check(skb, GFP_ATOMIC);
  48        if (unlikely(!skb))
  49                return;
  50
  51        skb_push(skb, ETH_HLEN);
  52        ovs_vport_receive(vport, skb);
  53}
  54
  55/* Called with rcu_read_lock and bottom-halves disabled. */
  56static rx_handler_result_t netdev_frame_hook(struct sk_buff **pskb)
  57{
  58        struct sk_buff *skb = *pskb;
  59        struct vport *vport;
  60
  61        if (unlikely(skb->pkt_type == PACKET_LOOPBACK))
  62                return RX_HANDLER_PASS;
  63
  64        vport = ovs_netdev_get_vport(skb->dev);
  65
  66        netdev_port_receive(vport, skb);
  67
  68        return RX_HANDLER_CONSUMED;
  69}
  70
  71static struct vport *netdev_create(const struct vport_parms *parms)
  72{
  73        struct vport *vport;
  74        struct netdev_vport *netdev_vport;
  75        int err;
  76
  77        vport = ovs_vport_alloc(sizeof(struct netdev_vport),
  78                                &ovs_netdev_vport_ops, parms);
  79        if (IS_ERR(vport)) {
  80                err = PTR_ERR(vport);
  81                goto error;
  82        }
  83
  84        netdev_vport = netdev_vport_priv(vport);
  85
  86        netdev_vport->dev = dev_get_by_name(&init_net, parms->name);
  87        if (!netdev_vport->dev) {
  88                err = -ENODEV;
  89                goto error_free_vport;
  90        }
  91
  92        if (netdev_vport->dev->flags & IFF_LOOPBACK ||
  93            netdev_vport->dev->type != ARPHRD_ETHER ||
  94            ovs_is_internal_dev(netdev_vport->dev)) {
  95                err = -EINVAL;
  96                goto error_put;
  97        }
  98
  99        err = netdev_rx_handler_register(netdev_vport->dev, netdev_frame_hook,
 100                                         vport);
 101        if (err)
 102                goto error_put;
 103
 104        dev_set_promiscuity(netdev_vport->dev, 1);
 105        netdev_vport->dev->priv_flags |= IFF_OVS_DATAPATH;
 106
 107        return vport;
 108
 109error_put:
 110        dev_put(netdev_vport->dev);
 111error_free_vport:
 112        ovs_vport_free(vport);
 113error:
 114        return ERR_PTR(err);
 115}
 116
 117static void netdev_destroy(struct vport *vport)
 118{
 119        struct netdev_vport *netdev_vport = netdev_vport_priv(vport);
 120
 121        netdev_vport->dev->priv_flags &= ~IFF_OVS_DATAPATH;
 122        netdev_rx_handler_unregister(netdev_vport->dev);
 123        dev_set_promiscuity(netdev_vport->dev, -1);
 124
 125        synchronize_rcu();
 126
 127        dev_put(netdev_vport->dev);
 128        ovs_vport_free(vport);
 129}
 130
 131const char *ovs_netdev_get_name(const struct vport *vport)
 132{
 133        const struct netdev_vport *netdev_vport = netdev_vport_priv(vport);
 134        return netdev_vport->dev->name;
 135}
 136
 137int ovs_netdev_get_ifindex(const struct vport *vport)
 138{
 139        const struct netdev_vport *netdev_vport = netdev_vport_priv(vport);
 140        return netdev_vport->dev->ifindex;
 141}
 142
 143static unsigned int packet_length(const struct sk_buff *skb)
 144{
 145        unsigned int length = skb->len - ETH_HLEN;
 146
 147        if (skb->protocol == htons(ETH_P_8021Q))
 148                length -= VLAN_HLEN;
 149
 150        return length;
 151}
 152
 153static int netdev_send(struct vport *vport, struct sk_buff *skb)
 154{
 155        struct netdev_vport *netdev_vport = netdev_vport_priv(vport);
 156        int mtu = netdev_vport->dev->mtu;
 157        int len;
 158
 159        if (unlikely(packet_length(skb) > mtu && !skb_is_gso(skb))) {
 160                net_warn_ratelimited("%s: dropped over-mtu packet: %d > %d\n",
 161                                     ovs_dp_name(vport->dp),
 162                                     packet_length(skb), mtu);
 163                goto error;
 164        }
 165
 166        if (unlikely(skb_warn_if_lro(skb)))
 167                goto error;
 168
 169        skb->dev = netdev_vport->dev;
 170        len = skb->len;
 171        dev_queue_xmit(skb);
 172
 173        return len;
 174
 175error:
 176        kfree_skb(skb);
 177        ovs_vport_record_error(vport, VPORT_E_TX_DROPPED);
 178        return 0;
 179}
 180
 181/* Returns null if this device is not attached to a datapath. */
 182struct vport *ovs_netdev_get_vport(struct net_device *dev)
 183{
 184        if (likely(dev->priv_flags & IFF_OVS_DATAPATH))
 185                return (struct vport *)
 186                        rcu_dereference_rtnl(dev->rx_handler_data);
 187        else
 188                return NULL;
 189}
 190
 191const struct vport_ops ovs_netdev_vport_ops = {
 192        .type           = OVS_VPORT_TYPE_NETDEV,
 193        .create         = netdev_create,
 194        .destroy        = netdev_destroy,
 195        .get_name       = ovs_netdev_get_name,
 196        .get_ifindex    = ovs_netdev_get_ifindex,
 197        .send           = netdev_send,
 198};
 199
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