Kyle Swenson | 8d8f654 | 2021-03-15 11:02:55 -0600 | [diff] [blame] | 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 | #include <linux/export.h> |
| 30 | |
| 31 | #include <net/ip_tunnels.h> |
| 32 | #include <net/rtnetlink.h> |
| 33 | |
| 34 | #include "datapath.h" |
| 35 | #include "vport.h" |
| 36 | #include "vport-internal_dev.h" |
| 37 | #include "vport-netdev.h" |
| 38 | |
| 39 | static struct vport_ops ovs_netdev_vport_ops; |
| 40 | |
| 41 | /* Must be called with rcu_read_lock. */ |
| 42 | static void netdev_port_receive(struct sk_buff *skb) |
| 43 | { |
| 44 | struct vport *vport; |
| 45 | |
| 46 | vport = ovs_netdev_get_vport(skb->dev); |
| 47 | if (unlikely(!vport)) |
| 48 | goto error; |
| 49 | |
| 50 | if (unlikely(skb_warn_if_lro(skb))) |
| 51 | goto error; |
| 52 | |
| 53 | /* Make our own copy of the packet. Otherwise we will mangle the |
| 54 | * packet for anyone who came before us (e.g. tcpdump via AF_PACKET). |
| 55 | */ |
| 56 | skb = skb_share_check(skb, GFP_ATOMIC); |
| 57 | if (unlikely(!skb)) |
| 58 | return; |
| 59 | |
| 60 | skb_push(skb, ETH_HLEN); |
| 61 | skb_postpush_rcsum(skb, skb->data, ETH_HLEN); |
| 62 | ovs_vport_receive(vport, skb, skb_tunnel_info(skb)); |
| 63 | return; |
| 64 | error: |
| 65 | kfree_skb(skb); |
| 66 | } |
| 67 | |
| 68 | /* Called with rcu_read_lock and bottom-halves disabled. */ |
| 69 | static rx_handler_result_t netdev_frame_hook(struct sk_buff **pskb) |
| 70 | { |
| 71 | struct sk_buff *skb = *pskb; |
| 72 | |
| 73 | if (unlikely(skb->pkt_type == PACKET_LOOPBACK)) |
| 74 | return RX_HANDLER_PASS; |
| 75 | |
| 76 | netdev_port_receive(skb); |
| 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 local->dev; |
| 87 | } |
| 88 | |
| 89 | struct vport *ovs_netdev_link(struct vport *vport, const char *name) |
| 90 | { |
| 91 | int err; |
| 92 | |
| 93 | vport->dev = dev_get_by_name(ovs_dp_get_net(vport->dp), name); |
| 94 | if (!vport->dev) { |
| 95 | err = -ENODEV; |
| 96 | goto error_free_vport; |
| 97 | } |
| 98 | |
| 99 | if (vport->dev->flags & IFF_LOOPBACK || |
| 100 | vport->dev->type != ARPHRD_ETHER || |
| 101 | ovs_is_internal_dev(vport->dev)) { |
| 102 | err = -EINVAL; |
| 103 | goto error_put; |
| 104 | } |
| 105 | |
| 106 | rtnl_lock(); |
| 107 | err = netdev_master_upper_dev_link(vport->dev, |
| 108 | get_dpdev(vport->dp)); |
| 109 | if (err) |
| 110 | goto error_unlock; |
| 111 | |
| 112 | err = netdev_rx_handler_register(vport->dev, netdev_frame_hook, |
| 113 | vport); |
| 114 | if (err) |
| 115 | goto error_master_upper_dev_unlink; |
| 116 | |
| 117 | dev_disable_lro(vport->dev); |
| 118 | dev_set_promiscuity(vport->dev, 1); |
| 119 | vport->dev->priv_flags |= IFF_OVS_DATAPATH; |
| 120 | rtnl_unlock(); |
| 121 | |
| 122 | return vport; |
| 123 | |
| 124 | error_master_upper_dev_unlink: |
| 125 | netdev_upper_dev_unlink(vport->dev, get_dpdev(vport->dp)); |
| 126 | error_unlock: |
| 127 | rtnl_unlock(); |
| 128 | error_put: |
| 129 | dev_put(vport->dev); |
| 130 | error_free_vport: |
| 131 | ovs_vport_free(vport); |
| 132 | return ERR_PTR(err); |
| 133 | } |
| 134 | EXPORT_SYMBOL_GPL(ovs_netdev_link); |
| 135 | |
| 136 | static struct vport *netdev_create(const struct vport_parms *parms) |
| 137 | { |
| 138 | struct vport *vport; |
| 139 | |
| 140 | vport = ovs_vport_alloc(0, &ovs_netdev_vport_ops, parms); |
| 141 | if (IS_ERR(vport)) |
| 142 | return vport; |
| 143 | |
| 144 | return ovs_netdev_link(vport, parms->name); |
| 145 | } |
| 146 | |
| 147 | static void vport_netdev_free(struct rcu_head *rcu) |
| 148 | { |
| 149 | struct vport *vport = container_of(rcu, struct vport, rcu); |
| 150 | |
| 151 | if (vport->dev) |
| 152 | dev_put(vport->dev); |
| 153 | ovs_vport_free(vport); |
| 154 | } |
| 155 | |
| 156 | void ovs_netdev_detach_dev(struct vport *vport) |
| 157 | { |
| 158 | ASSERT_RTNL(); |
| 159 | vport->dev->priv_flags &= ~IFF_OVS_DATAPATH; |
| 160 | netdev_rx_handler_unregister(vport->dev); |
| 161 | netdev_upper_dev_unlink(vport->dev, |
| 162 | netdev_master_upper_dev_get(vport->dev)); |
| 163 | dev_set_promiscuity(vport->dev, -1); |
| 164 | } |
| 165 | EXPORT_SYMBOL_GPL(ovs_netdev_detach_dev); |
| 166 | |
| 167 | static void netdev_destroy(struct vport *vport) |
| 168 | { |
| 169 | rtnl_lock(); |
| 170 | if (vport->dev->priv_flags & IFF_OVS_DATAPATH) |
| 171 | ovs_netdev_detach_dev(vport); |
| 172 | rtnl_unlock(); |
| 173 | |
| 174 | call_rcu(&vport->rcu, vport_netdev_free); |
| 175 | } |
| 176 | |
| 177 | void ovs_netdev_tunnel_destroy(struct vport *vport) |
| 178 | { |
| 179 | rtnl_lock(); |
| 180 | if (vport->dev->priv_flags & IFF_OVS_DATAPATH) |
| 181 | ovs_netdev_detach_dev(vport); |
| 182 | |
| 183 | /* We can be invoked by both explicit vport deletion and |
| 184 | * underlying netdev deregistration; delete the link only |
| 185 | * if it's not already shutting down. |
| 186 | */ |
| 187 | if (vport->dev->reg_state == NETREG_REGISTERED) |
| 188 | rtnl_delete_link(vport->dev); |
| 189 | dev_put(vport->dev); |
| 190 | vport->dev = NULL; |
| 191 | rtnl_unlock(); |
| 192 | |
| 193 | call_rcu(&vport->rcu, vport_netdev_free); |
| 194 | } |
| 195 | EXPORT_SYMBOL_GPL(ovs_netdev_tunnel_destroy); |
| 196 | |
| 197 | /* Returns null if this device is not attached to a datapath. */ |
| 198 | struct vport *ovs_netdev_get_vport(struct net_device *dev) |
| 199 | { |
| 200 | if (likely(dev->priv_flags & IFF_OVS_DATAPATH)) |
| 201 | return (struct vport *) |
| 202 | rcu_dereference_rtnl(dev->rx_handler_data); |
| 203 | else |
| 204 | return NULL; |
| 205 | } |
| 206 | |
| 207 | static struct vport_ops ovs_netdev_vport_ops = { |
| 208 | .type = OVS_VPORT_TYPE_NETDEV, |
| 209 | .create = netdev_create, |
| 210 | .destroy = netdev_destroy, |
| 211 | .send = dev_queue_xmit, |
| 212 | }; |
| 213 | |
| 214 | int __init ovs_netdev_init(void) |
| 215 | { |
| 216 | return ovs_vport_ops_register(&ovs_netdev_vport_ops); |
| 217 | } |
| 218 | |
| 219 | void ovs_netdev_exit(void) |
| 220 | { |
| 221 | ovs_vport_ops_unregister(&ovs_netdev_vport_ops); |
| 222 | } |