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