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. */ 36 static void netdev_port_receive(struct vport *vport, struct sk_buff *skb) 37 { 38 if (unlikely(!vport)) 39 goto error; 40 41 if (unlikely(skb_warn_if_lro(skb))) 42 goto error; 43 44 /* Make our own copy of the packet. Otherwise we will mangle the 45 * packet for anyone who came before us (e.g. tcpdump via AF_PACKET). 46 * (No one comes after us, since we tell handle_bridge() that we took 47 * the packet.) */ 48 skb = skb_share_check(skb, GFP_ATOMIC); 49 if (unlikely(!skb)) 50 return; 51 52 skb_push(skb, ETH_HLEN); 53 ovs_vport_receive(vport, skb); 54 return; 55 56 error: 57 kfree_skb(skb); 58 } 59 60 /* Called with rcu_read_lock and bottom-halves disabled. */ 61 static rx_handler_result_t netdev_frame_hook(struct sk_buff **pskb) 62 { 63 struct sk_buff *skb = *pskb; 64 struct vport *vport; 65 66 if (unlikely(skb->pkt_type == PACKET_LOOPBACK)) 67 return RX_HANDLER_PASS; 68 69 vport = ovs_netdev_get_vport(skb->dev); 70 71 netdev_port_receive(vport, skb); 72 73 return RX_HANDLER_CONSUMED; 74 } 75 76 static struct vport *netdev_create(const struct vport_parms *parms) 77 { 78 struct vport *vport; 79 struct netdev_vport *netdev_vport; 80 int err; 81 82 vport = ovs_vport_alloc(sizeof(struct netdev_vport), 83 &ovs_netdev_vport_ops, parms); 84 if (IS_ERR(vport)) { 85 err = PTR_ERR(vport); 86 goto error; 87 } 88 89 netdev_vport = netdev_vport_priv(vport); 90 91 netdev_vport->dev = dev_get_by_name(ovs_dp_get_net(vport->dp), parms->name); 92 if (!netdev_vport->dev) { 93 err = -ENODEV; 94 goto error_free_vport; 95 } 96 97 if (netdev_vport->dev->flags & IFF_LOOPBACK || 98 netdev_vport->dev->type != ARPHRD_ETHER || 99 ovs_is_internal_dev(netdev_vport->dev)) { 100 err = -EINVAL; 101 goto error_put; 102 } 103 104 err = netdev_rx_handler_register(netdev_vport->dev, netdev_frame_hook, 105 vport); 106 if (err) 107 goto error_put; 108 109 dev_set_promiscuity(netdev_vport->dev, 1); 110 netdev_vport->dev->priv_flags |= IFF_OVS_DATAPATH; 111 112 return vport; 113 114 error_put: 115 dev_put(netdev_vport->dev); 116 error_free_vport: 117 ovs_vport_free(vport); 118 error: 119 return ERR_PTR(err); 120 } 121 122 static void free_port_rcu(struct rcu_head *rcu) 123 { 124 struct netdev_vport *netdev_vport = container_of(rcu, 125 struct netdev_vport, rcu); 126 127 dev_put(netdev_vport->dev); 128 ovs_vport_free(vport_from_priv(netdev_vport)); 129 } 130 131 static void netdev_destroy(struct vport *vport) 132 { 133 struct netdev_vport *netdev_vport = netdev_vport_priv(vport); 134 135 netdev_vport->dev->priv_flags &= ~IFF_OVS_DATAPATH; 136 netdev_rx_handler_unregister(netdev_vport->dev); 137 dev_set_promiscuity(netdev_vport->dev, -1); 138 139 call_rcu(&netdev_vport->rcu, free_port_rcu); 140 } 141 142 const char *ovs_netdev_get_name(const struct vport *vport) 143 { 144 const struct netdev_vport *netdev_vport = netdev_vport_priv(vport); 145 return netdev_vport->dev->name; 146 } 147 148 int ovs_netdev_get_ifindex(const struct vport *vport) 149 { 150 const struct netdev_vport *netdev_vport = netdev_vport_priv(vport); 151 return netdev_vport->dev->ifindex; 152 } 153 154 static unsigned int packet_length(const struct sk_buff *skb) 155 { 156 unsigned int length = skb->len - ETH_HLEN; 157 158 if (skb->protocol == htons(ETH_P_8021Q)) 159 length -= VLAN_HLEN; 160 161 return length; 162 } 163 164 static int netdev_send(struct vport *vport, struct sk_buff *skb) 165 { 166 struct netdev_vport *netdev_vport = netdev_vport_priv(vport); 167 int mtu = netdev_vport->dev->mtu; 168 int len; 169 170 if (unlikely(packet_length(skb) > mtu && !skb_is_gso(skb))) { 171 net_warn_ratelimited("%s: dropped over-mtu packet: %d > %d\n", 172 netdev_vport->dev->name, 173 packet_length(skb), mtu); 174 goto error; 175 } 176 177 skb->dev = netdev_vport->dev; 178 len = skb->len; 179 dev_queue_xmit(skb); 180 181 return len; 182 183 error: 184 kfree_skb(skb); 185 ovs_vport_record_error(vport, VPORT_E_TX_DROPPED); 186 return 0; 187 } 188 189 /* Returns null if this device is not attached to a datapath. */ 190 struct vport *ovs_netdev_get_vport(struct net_device *dev) 191 { 192 if (likely(dev->priv_flags & IFF_OVS_DATAPATH)) 193 return (struct vport *) 194 rcu_dereference_rtnl(dev->rx_handler_data); 195 else 196 return NULL; 197 } 198 199 const struct vport_ops ovs_netdev_vport_ops = { 200 .type = OVS_VPORT_TYPE_NETDEV, 201 .create = netdev_create, 202 .destroy = netdev_destroy, 203 .get_name = ovs_netdev_get_name, 204 .get_ifindex = ovs_netdev_get_ifindex, 205 .send = netdev_send, 206 }; 207