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 #include <linux/openvswitch.h> 29 30 #include <net/llc.h> 31 32 #include "datapath.h" 33 #include "vport-internal_dev.h" 34 #include "vport-netdev.h" 35 36 static struct vport_ops ovs_netdev_vport_ops; 37 38 /* Must be called with rcu_read_lock. */ 39 static void netdev_port_receive(struct vport *vport, struct sk_buff *skb) 40 { 41 if (unlikely(!vport)) 42 goto error; 43 44 if (unlikely(skb_warn_if_lro(skb))) 45 goto error; 46 47 /* Make our own copy of the packet. Otherwise we will mangle the 48 * packet for anyone who came before us (e.g. tcpdump via AF_PACKET). 49 */ 50 skb = skb_share_check(skb, GFP_ATOMIC); 51 if (unlikely(!skb)) 52 return; 53 54 skb_push(skb, ETH_HLEN); 55 ovs_skb_postpush_rcsum(skb, skb->data, ETH_HLEN); 56 57 ovs_vport_receive(vport, skb, NULL); 58 return; 59 60 error: 61 kfree_skb(skb); 62 } 63 64 /* Called with rcu_read_lock and bottom-halves disabled. */ 65 static rx_handler_result_t netdev_frame_hook(struct sk_buff **pskb) 66 { 67 struct sk_buff *skb = *pskb; 68 struct vport *vport; 69 70 if (unlikely(skb->pkt_type == PACKET_LOOPBACK)) 71 return RX_HANDLER_PASS; 72 73 vport = ovs_netdev_get_vport(skb->dev); 74 75 netdev_port_receive(vport, skb); 76 77 return RX_HANDLER_CONSUMED; 78 } 79 80 static struct net_device *get_dpdev(const struct datapath *dp) 81 { 82 struct vport *local; 83 84 local = ovs_vport_ovsl(dp, OVSP_LOCAL); 85 BUG_ON(!local); 86 return netdev_vport_priv(local)->dev; 87 } 88 89 static struct vport *netdev_create(const struct vport_parms *parms) 90 { 91 struct vport *vport; 92 struct netdev_vport *netdev_vport; 93 int err; 94 95 vport = ovs_vport_alloc(sizeof(struct netdev_vport), 96 &ovs_netdev_vport_ops, parms); 97 if (IS_ERR(vport)) { 98 err = PTR_ERR(vport); 99 goto error; 100 } 101 102 netdev_vport = netdev_vport_priv(vport); 103 104 netdev_vport->dev = dev_get_by_name(ovs_dp_get_net(vport->dp), parms->name); 105 if (!netdev_vport->dev) { 106 err = -ENODEV; 107 goto error_free_vport; 108 } 109 110 if (netdev_vport->dev->flags & IFF_LOOPBACK || 111 netdev_vport->dev->type != ARPHRD_ETHER || 112 ovs_is_internal_dev(netdev_vport->dev)) { 113 err = -EINVAL; 114 goto error_put; 115 } 116 117 rtnl_lock(); 118 err = netdev_master_upper_dev_link(netdev_vport->dev, 119 get_dpdev(vport->dp)); 120 if (err) 121 goto error_unlock; 122 123 err = netdev_rx_handler_register(netdev_vport->dev, netdev_frame_hook, 124 vport); 125 if (err) 126 goto error_master_upper_dev_unlink; 127 128 dev_disable_lro(netdev_vport->dev); 129 dev_set_promiscuity(netdev_vport->dev, 1); 130 netdev_vport->dev->priv_flags |= IFF_OVS_DATAPATH; 131 rtnl_unlock(); 132 133 return vport; 134 135 error_master_upper_dev_unlink: 136 netdev_upper_dev_unlink(netdev_vport->dev, get_dpdev(vport->dp)); 137 error_unlock: 138 rtnl_unlock(); 139 error_put: 140 dev_put(netdev_vport->dev); 141 error_free_vport: 142 ovs_vport_free(vport); 143 error: 144 return ERR_PTR(err); 145 } 146 147 static void free_port_rcu(struct rcu_head *rcu) 148 { 149 struct netdev_vport *netdev_vport = container_of(rcu, 150 struct netdev_vport, rcu); 151 152 dev_put(netdev_vport->dev); 153 ovs_vport_free(vport_from_priv(netdev_vport)); 154 } 155 156 void ovs_netdev_detach_dev(struct vport *vport) 157 { 158 struct netdev_vport *netdev_vport = netdev_vport_priv(vport); 159 160 ASSERT_RTNL(); 161 netdev_vport->dev->priv_flags &= ~IFF_OVS_DATAPATH; 162 netdev_rx_handler_unregister(netdev_vport->dev); 163 netdev_upper_dev_unlink(netdev_vport->dev, 164 netdev_master_upper_dev_get(netdev_vport->dev)); 165 dev_set_promiscuity(netdev_vport->dev, -1); 166 } 167 168 static void netdev_destroy(struct vport *vport) 169 { 170 struct netdev_vport *netdev_vport = netdev_vport_priv(vport); 171 172 rtnl_lock(); 173 if (netdev_vport->dev->priv_flags & IFF_OVS_DATAPATH) 174 ovs_netdev_detach_dev(vport); 175 rtnl_unlock(); 176 177 call_rcu(&netdev_vport->rcu, free_port_rcu); 178 } 179 180 const char *ovs_netdev_get_name(const struct vport *vport) 181 { 182 const struct netdev_vport *netdev_vport = netdev_vport_priv(vport); 183 return netdev_vport->dev->name; 184 } 185 186 static unsigned int packet_length(const struct sk_buff *skb) 187 { 188 unsigned int length = skb->len - ETH_HLEN; 189 190 if (skb->protocol == htons(ETH_P_8021Q)) 191 length -= VLAN_HLEN; 192 193 return length; 194 } 195 196 static int netdev_send(struct vport *vport, struct sk_buff *skb) 197 { 198 struct netdev_vport *netdev_vport = netdev_vport_priv(vport); 199 int mtu = netdev_vport->dev->mtu; 200 int len; 201 202 if (unlikely(packet_length(skb) > mtu && !skb_is_gso(skb))) { 203 net_warn_ratelimited("%s: dropped over-mtu packet: %d > %d\n", 204 netdev_vport->dev->name, 205 packet_length(skb), mtu); 206 goto drop; 207 } 208 209 skb->dev = netdev_vport->dev; 210 len = skb->len; 211 dev_queue_xmit(skb); 212 213 return len; 214 215 drop: 216 kfree_skb(skb); 217 return 0; 218 } 219 220 /* Returns null if this device is not attached to a datapath. */ 221 struct vport *ovs_netdev_get_vport(struct net_device *dev) 222 { 223 if (likely(dev->priv_flags & IFF_OVS_DATAPATH)) 224 return (struct vport *) 225 rcu_dereference_rtnl(dev->rx_handler_data); 226 else 227 return NULL; 228 } 229 230 static struct vport_ops ovs_netdev_vport_ops = { 231 .type = OVS_VPORT_TYPE_NETDEV, 232 .create = netdev_create, 233 .destroy = netdev_destroy, 234 .get_name = ovs_netdev_get_name, 235 .send = netdev_send, 236 }; 237 238 int __init ovs_netdev_init(void) 239 { 240 return ovs_vport_ops_register(&ovs_netdev_vport_ops); 241 } 242 243 void ovs_netdev_exit(void) 244 { 245 ovs_vport_ops_unregister(&ovs_netdev_vport_ops); 246 } 247