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linux
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net
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openvswitch
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vport-netdev.c
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198 lines (160 loc) · 4.81 KB
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linux
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net
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openvswitch
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vport-netdev.c
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/* * Copyright (c) 2007-2012 Nicira, Inc. * * This program is free software; you can redistribute it and/or * modify it under the terms of version 2 of the GNU General Public * License as published by the Free Software Foundation. * * This program is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA * 02110-1301, USA */ #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 <net/llc.h> #include "datapath.h" #include "vport-internal_dev.h" #include "vport-netdev.h" /* Must be called with rcu_read_lock. */ static void netdev_port_receive(struct vport *vport, struct sk_buff *skb) { if (unlikely(!vport)) { kfree_skb(skb); return; } /* 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). * (No one comes after us, since we tell handle_bridge() that we took * the packet.) */ skb = skb_share_check(skb, GFP_ATOMIC); if (unlikely(!skb)) return; skb_push(skb, ETH_HLEN); ovs_vport_receive(vport, 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; struct vport *vport; if (unlikely(skb->pkt_type == PACKET_LOOPBACK)) return RX_HANDLER_PASS; vport = ovs_netdev_get_vport(skb->dev); netdev_port_receive(vport, skb); return RX_HANDLER_CONSUMED; } static struct vport *netdev_create(const struct vport_parms *parms) { struct vport *vport; struct netdev_vport *netdev_vport; int err; vport = ovs_vport_alloc(sizeof(struct netdev_vport), &ovs_netdev_vport_ops, parms); if (IS_ERR(vport)) { err = PTR_ERR(vport); goto error; } netdev_vport = netdev_vport_priv(vport); netdev_vport->dev = dev_get_by_name(&init_net, parms->name); if (!netdev_vport->dev) { err = -ENODEV; goto error_free_vport; } if (netdev_vport->dev->flags & IFF_LOOPBACK || netdev_vport->dev->type != ARPHRD_ETHER || ovs_is_internal_dev(netdev_vport->dev)) { err = -EINVAL; goto error_put; } err = netdev_rx_handler_register(netdev_vport->dev, netdev_frame_hook, vport); if (err) goto error_put; dev_set_promiscuity(netdev_vport->dev, 1); netdev_vport->dev->priv_flags |= IFF_OVS_DATAPATH; return vport; error_put: dev_put(netdev_vport->dev); error_free_vport: ovs_vport_free(vport); error: return ERR_PTR(err); } static void netdev_destroy(struct vport *vport) { struct netdev_vport *netdev_vport = netdev_vport_priv(vport); netdev_vport->dev->priv_flags &= ~IFF_OVS_DATAPATH; netdev_rx_handler_unregister(netdev_vport->dev); dev_set_promiscuity(netdev_vport->dev, -1); synchronize_rcu(); dev_put(netdev_vport->dev); ovs_vport_free(vport); } const char *ovs_netdev_get_name(const struct vport *vport) { const struct netdev_vport *netdev_vport = netdev_vport_priv(vport); return netdev_vport->dev->name; } int ovs_netdev_get_ifindex(const struct vport *vport) { const struct netdev_vport *netdev_vport = netdev_vport_priv(vport); return netdev_vport->dev->ifindex; } static unsigned int packet_length(const struct sk_buff *skb) { unsigned int length = skb->len - ETH_HLEN; if (skb->protocol == htons(ETH_P_8021Q)) length -= VLAN_HLEN; return length; } static int netdev_send(struct vport *vport, struct sk_buff *skb) { struct netdev_vport *netdev_vport = netdev_vport_priv(vport); int mtu = netdev_vport->dev->mtu; int len; if (unlikely(packet_length(skb) > mtu && !skb_is_gso(skb))) { net_warn_ratelimited("%s: dropped over-mtu packet: %d > %d\n", ovs_dp_name(vport->dp), packet_length(skb), mtu); goto error; } if (unlikely(skb_warn_if_lro(skb))) goto error; skb->dev = netdev_vport->dev; len = skb->len; dev_queue_xmit(skb); return len; error: kfree_skb(skb); ovs_vport_record_error(vport, VPORT_E_TX_DROPPED); return 0; } /* Returns null if this device is not attached to a datapath. */ struct vport *ovs_netdev_get_vport(struct net_device *dev) { if (likely(dev->priv_flags & IFF_OVS_DATAPATH)) return (struct vport *) rcu_dereference_rtnl(dev->rx_handler_data); else return NULL; } const struct vport_ops ovs_netdev_vport_ops = { .type = OVS_VPORT_TYPE_NETDEV, .create = netdev_create, .destroy = netdev_destroy, .get_name = ovs_netdev_get_name, .get_ifindex = ovs_netdev_get_ifindex, .send = netdev_send, };
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