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
  31 static struct vport_ops ovs_geneve_vport_ops;
  32 /**
  33  * struct geneve_port - Keeps track of open UDP ports
  34  * @dst_port: destination port.
  35  */
  36 struct geneve_port {
  37         u16 dst_port;
  38 };
  39
  40 static inline struct geneve_port *geneve_vport(const struct vport *vport)
  41 {
  42         return vport_priv(vport);
  43 }
  44
  45 static 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
  55 static 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;
 106 error:
 107         return ERR_PTR(err);
 108 }
 109
 110 static 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
 121 static 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
 129 static int __init ovs_geneve_tnl_init(void)
 130 {
 131         return ovs_vport_ops_register(&ovs_geneve_vport_ops);
 132 }
 133
 134 static void __exit ovs_geneve_tnl_exit(void)
 135 {
 136         ovs_vport_ops_unregister(&ovs_geneve_vport_ops);
 137 }
 138
 139 module_init(ovs_geneve_tnl_init);
 140 module_exit(ovs_geneve_tnl_exit);
 141
 142 MODULE_DESCRIPTION("OVS: Geneve switching port");
 143 MODULE_LICENSE("GPL");
 144 MODULE_ALIAS("vport-type-5");