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