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        err = dev_change_flags(dev, dev->flags | IFF_UP);
  97        if (err < 0) {
  98                rtnl_delete_link(dev);
  99                rtnl_unlock();
 100                ovs_vport_free(vport);
 101                goto error;
 102        }
 103
 104        rtnl_unlock();
 105        return vport;
 106error:
 107        return ERR_PTR(err);
 108}
 109
 110static struct vport *geneve_create(const struct vport_parms *parms)
 111{
 112        struct vport *vport;
 113
 114        vport = geneve_tnl_create(parms);
 115        if (IS_ERR(vport))
 116                return vport;
 117
 118        return ovs_netdev_link(vport, parms->name);
 119}
 120
 121static struct vport_ops ovs_geneve_vport_ops = {
 122        .type           = OVS_VPORT_TYPE_GENEVE,
 123        .create         = geneve_create,
 124        .destroy        = ovs_netdev_tunnel_destroy,
 125        .get_options    = geneve_get_options,
 126        .send           = dev_queue_xmit,
 127};
 128
 129static int __init ovs_geneve_tnl_init(void)
 130{
 131        return ovs_vport_ops_register(&ovs_geneve_vport_ops);
 132}
 133
 134static void __exit ovs_geneve_tnl_exit(void)
 135{
 136        ovs_vport_ops_unregister(&ovs_geneve_vport_ops);
 137}
 138
 139module_init(ovs_geneve_tnl_init);
 140module_exit(ovs_geneve_tnl_exit);
 141
 142MODULE_DESCRIPTION("OVS: Geneve switching port");
 143MODULE_LICENSE("GPL");
 144MODULE_ALIAS("vport-type-5");
 145