LXR linux/net/openvswitch/vport-geneve.c

   1/*
   2 * Copyright (c) 2014 Nicira, Inc.
   3 *
   4 * This program is free software; you can redistribute it and/or
   5 * modify it under the terms of the GNU General Public License
   6 * as published by the Free Software Foundation; either version
   7 * 2 of the License, or (at your option) any later version.
   8 */
   9
  10#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  11
  12#include <linux/in.h>
  13#include <linux/ip.h>
  14#include <linux/net.h>
  15#include <linux/rculist.h>
  16#include <linux/udp.h>
  17#include <linux/if_vlan.h>
  18#include <linux/module.h>
  19
  20#include <net/geneve.h>
  21#include <net/icmp.h>
  22#include <net/ip.h>
  23#include <net/route.h>
  24#include <net/udp.h>
  25#include <net/xfrm.h>
  26
  27#include "datapath.h"
  28#include "vport.h"
  29#include "vport-netdev.h"
  30
  31static struct vport_ops ovs_geneve_vport_ops;
  32/**
  33 * struct geneve_port - Keeps track of open UDP ports
  34 * @dst_port: destination port.
  35 */
  36struct geneve_port {
  37        u16 dst_port;
  38};
  39
  40static inline struct geneve_port *geneve_vport(const struct vport *vport)
  41{
  42        return vport_priv(vport);
  43}
  44
  45static int geneve_get_options(const struct vport *vport,
  46                              struct sk_buff *skb)
  47{
  48        struct geneve_port *geneve_port = geneve_vport(vport);
  49
  50        if (nla_put_u16(skb, OVS_TUNNEL_ATTR_DST_PORT, geneve_port->dst_port))
  51                return -EMSGSIZE;
  52        return 0;
  53}
  54
  55static struct vport *geneve_tnl_create(const struct vport_parms *parms)
  56{
  57        struct net *net = ovs_dp_get_net(parms->dp);
  58        struct nlattr *options = parms->options;
  59        struct geneve_port *geneve_port;
  60        struct net_device *dev;
  61        struct vport *vport;
  62        struct nlattr *a;
  63        u16 dst_port;
  64        int err;
  65
  66        if (!options) {
  67                err = -EINVAL;
  68                goto error;
  69        }
  70
  71        a = nla_find_nested(options, OVS_TUNNEL_ATTR_DST_PORT);
  72        if (a && nla_len(a) == sizeof(u16)) {
  73                dst_port = nla_get_u16(a);
  74        } else {
  75                /* Require destination port from userspace. */
  76                err = -EINVAL;
  77                goto error;
  78        }
  79
  80        vport = ovs_vport_alloc(sizeof(struct geneve_port),
  81                                &ovs_geneve_vport_ops, parms);
  82        if (IS_ERR(vport))
  83                return vport;
  84
  85        geneve_port = geneve_vport(vport);
  86        geneve_port->dst_port = dst_port;
  87
  88        rtnl_lock();
  89        dev = geneve_dev_create_fb(net, parms->name, NET_NAME_USER, dst_port);
  90        if (IS_ERR(dev)) {
  91                rtnl_unlock();
  92                ovs_vport_free(vport);
  93                return ERR_CAST(dev);
  94        }
  95
  96        dev_change_flags(dev, dev->flags | IFF_UP);
  97        rtnl_unlock();
  98        return vport;
  99error:
 100        return ERR_PTR(err);
 101}
 102
 103static struct vport *geneve_create(const struct vport_parms *parms)
 104{
 105        struct vport *vport;
 106
 107        vport = geneve_tnl_create(parms);
 108        if (IS_ERR(vport))
 109                return vport;
 110
 111        return ovs_netdev_link(vport, parms->name);
 112}
 113
 114static struct vport_ops ovs_geneve_vport_ops = {
 115        .type           = OVS_VPORT_TYPE_GENEVE,
 116        .create         = geneve_create,
 117        .destroy        = ovs_netdev_tunnel_destroy,
 118        .get_options    = geneve_get_options,
 119        .send           = dev_queue_xmit,
 120};
 121
 122static int __init ovs_geneve_tnl_init(void)
 123{
 124        return ovs_vport_ops_register(&ovs_geneve_vport_ops);
 125}
 126
 127static void __exit ovs_geneve_tnl_exit(void)
 128{
 129        ovs_vport_ops_unregister(&ovs_geneve_vport_ops);
 130}
 131
 132module_init(ovs_geneve_tnl_init);
 133module_exit(ovs_geneve_tnl_exit);
 134
 135MODULE_DESCRIPTION("OVS: Geneve switching port");
 136MODULE_LICENSE("GPL");
 137MODULE_ALIAS("vport-type-5");
 138