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_skb_postpush_rcsum(skb, skb->data, ETH_HLEN); 53 54 ovs_vport_receive(vport, skb, NULL); 55 return; 56 57 error: 58 kfree_skb(skb); 59 } 60 61 /* Called with rcu_read_lock and bottom-halves disabled. */ 62 static rx_handler_result_t netdev_frame_hook(struct sk_buff **pskb) 63 { 64 struct sk_buff *skb = *pskb; 65 struct vport *vport; 66 67 if (unlikely(skb->pkt_type == PACKET_LOOPBACK)) 68 return RX_HANDLER_PASS; 69 70 vport = ovs_netdev_get_vport(skb->dev); 71 72 netdev_port_receive(vport, skb); 73 74 return RX_HANDLER_CONSUMED; 75 } 76 77 static struct vport *netdev_create(const struct vport_parms *parms) 78 { 79 struct vport *vport; 80 struct netdev_vport *netdev_vport; 81 int err; 82 83 vport = ovs_vport_alloc(sizeof(struct netdev_vport), 84 &ovs_netdev_vport_ops, parms); 85 if (IS_ERR(vport)) { 86 err = PTR_ERR(vport); 87 goto error; 88 } 89 90 netdev_vport = netdev_vport_priv(vport); 91 92 netdev_vport->dev = dev_get_by_name(ovs_dp_get_net(vport->dp), parms->name); 93 if (!netdev_vport->dev) { 94 err = -ENODEV; 95 goto error_free_vport; 96 } 97 98 if (netdev_vport->dev->flags & IFF_LOOPBACK || 99 netdev_vport->dev->type != ARPHRD_ETHER || 100 ovs_is_internal_dev(netdev_vport->dev)) { 101 err = -EINVAL; 102 goto error_put; 103 } 104 105 rtnl_lock(); 106 err = netdev_rx_handler_register(netdev_vport->dev, netdev_frame_hook, 107 vport); 108 if (err) 109 goto error_unlock; 110 111 dev_set_promiscuity(netdev_vport->dev, 1); 112 netdev_vport->dev->priv_flags |= IFF_OVS_DATAPATH; 113 rtnl_unlock(); 114 115 return vport; 116 117 error_unlock: 118 rtnl_unlock(); 119 error_put: 120 dev_put(netdev_vport->dev); 121 error_free_vport: 122 ovs_vport_free(vport); 123 error: 124 return ERR_PTR(err); 125 } 126 127 static void free_port_rcu(struct rcu_head *rcu) 128 { 129 struct netdev_vport *netdev_vport = container_of(rcu, 130 struct netdev_vport, rcu); 131 132 dev_put(netdev_vport->dev); 133 ovs_vport_free(vport_from_priv(netdev_vport)); 134 } 135 136 static void netdev_destroy(struct vport *vport) 137 { 138 struct netdev_vport *netdev_vport = netdev_vport_priv(vport); 139 140 rtnl_lock(); 141 netdev_vport->dev->priv_flags &= ~IFF_OVS_DATAPATH; 142 netdev_rx_handler_unregister(netdev_vport->dev); 143 dev_set_promiscuity(netdev_vport->dev, -1); 144 rtnl_unlock(); 145 146 call_rcu(&netdev_vport->rcu, free_port_rcu); 147 } 148 149 const char *ovs_netdev_get_name(const struct vport *vport) 150 { 151 const struct netdev_vport *netdev_vport = netdev_vport_priv(vport); 152 return netdev_vport->dev->name; 153 } 154 155 static unsigned int packet_length(const struct sk_buff *skb) 156 { 157 unsigned int length = skb->len - ETH_HLEN; 158 159 if (skb->protocol == htons(ETH_P_8021Q)) 160 length -= VLAN_HLEN; 161 162 return length; 163 } 164 165 static int netdev_send(struct vport *vport, struct sk_buff *skb) 166 { 167 struct netdev_vport *netdev_vport = netdev_vport_priv(vport); 168 int mtu = netdev_vport->dev->mtu; 169 int len; 170 171 if (unlikely(packet_length(skb) > mtu && !skb_is_gso(skb))) { 172 net_warn_ratelimited("%s: dropped over-mtu packet: %d > %d\n", 173 netdev_vport->dev->name, 174 packet_length(skb), mtu); 175 goto drop; 176 } 177 178 skb->dev = netdev_vport->dev; 179 len = skb->len; 180 dev_queue_xmit(skb); 181 182 return len; 183 184 drop: 185 kfree_skb(skb); 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 .send = netdev_send, 205 }; 206