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_set_promiscuity(netdev_vport->dev, 1); 129 netdev_vport->dev->priv_flags |= IFF_OVS_DATAPATH; 130 rtnl_unlock(); 131 132 return vport; 133 134 error_master_upper_dev_unlink: 135 netdev_upper_dev_unlink(netdev_vport->dev, get_dpdev(vport->dp)); 136 error_unlock: 137 rtnl_unlock(); 138 error_put: 139 dev_put(netdev_vport->dev); 140 error_free_vport: 141 ovs_vport_free(vport); 142 error: 143 return ERR_PTR(err); 144 } 145 146 static void free_port_rcu(struct rcu_head *rcu) 147 { 148 struct netdev_vport *netdev_vport = container_of(rcu, 149 struct netdev_vport, rcu); 150 151 dev_put(netdev_vport->dev); 152 ovs_vport_free(vport_from_priv(netdev_vport)); 153 } 154 155 void ovs_netdev_detach_dev(struct vport *vport) 156 { 157 struct netdev_vport *netdev_vport = netdev_vport_priv(vport); 158 159 ASSERT_RTNL(); 160 netdev_vport->dev->priv_flags &= ~IFF_OVS_DATAPATH; 161 netdev_rx_handler_unregister(netdev_vport->dev); 162 netdev_upper_dev_unlink(netdev_vport->dev, 163 netdev_master_upper_dev_get(netdev_vport->dev)); 164 dev_set_promiscuity(netdev_vport->dev, -1); 165 } 166 167 static void netdev_destroy(struct vport *vport) 168 { 169 struct netdev_vport *netdev_vport = netdev_vport_priv(vport); 170 171 rtnl_lock(); 172 if (netdev_vport->dev->priv_flags & IFF_OVS_DATAPATH) 173 ovs_netdev_detach_dev(vport); 174 rtnl_unlock(); 175 176 call_rcu(&netdev_vport->rcu, free_port_rcu); 177 } 178 179 const char *ovs_netdev_get_name(const struct vport *vport) 180 { 181 const struct netdev_vport *netdev_vport = netdev_vport_priv(vport); 182 return netdev_vport->dev->name; 183 } 184 185 static unsigned int packet_length(const struct sk_buff *skb) 186 { 187 unsigned int length = skb->len - ETH_HLEN; 188 189 if (skb->protocol == htons(ETH_P_8021Q)) 190 length -= VLAN_HLEN; 191 192 return length; 193 } 194 195 static int netdev_send(struct vport *vport, struct sk_buff *skb) 196 { 197 struct netdev_vport *netdev_vport = netdev_vport_priv(vport); 198 int mtu = netdev_vport->dev->mtu; 199 int len; 200 201 if (unlikely(packet_length(skb) > mtu && !skb_is_gso(skb))) { 202 net_warn_ratelimited("%s: dropped over-mtu packet: %d > %d\n", 203 netdev_vport->dev->name, 204 packet_length(skb), mtu); 205 goto drop; 206 } 207 208 skb->dev = netdev_vport->dev; 209 len = skb->len; 210 dev_queue_xmit(skb); 211 212 return len; 213 214 drop: 215 kfree_skb(skb); 216 return 0; 217 } 218 219 /* Returns null if this device is not attached to a datapath. */ 220 struct vport *ovs_netdev_get_vport(struct net_device *dev) 221 { 222 if (likely(dev->priv_flags & IFF_OVS_DATAPATH)) 223 return (struct vport *) 224 rcu_dereference_rtnl(dev->rx_handler_data); 225 else 226 return NULL; 227 } 228 229 static struct vport_ops ovs_netdev_vport_ops = { 230 .type = OVS_VPORT_TYPE_NETDEV, 231 .create = netdev_create, 232 .destroy = netdev_destroy, 233 .get_name = ovs_netdev_get_name, 234 .send = netdev_send, 235 }; 236 237 int __init ovs_netdev_init(void) 238 { 239 return ovs_vport_ops_register(&ovs_netdev_vport_ops); 240 } 241 242 void ovs_netdev_exit(void) 243 { 244 ovs_vport_ops_unregister(&ovs_netdev_vport_ops); 245 } 246