datapath/vport-lisp.c

   1 /*
   2  * Copyright (c) 2015 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/lisp.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_lisp_vport_ops;
  32 /**
  33  * struct lisp_port - Keeps track of open UDP ports
  34  * @dst_port: destination port.
  35  */
  36 struct lisp_port {
  37         u16 port_no;
  38 };
  39
  40 static inline struct lisp_port *lisp_vport(const struct vport *vport)
  41 {
  42         return vport_priv(vport);
  43 }
  44
  45 static int lisp_get_options(const struct vport *vport,
  46                               struct sk_buff *skb)
  47 {
  48         struct lisp_port *lisp_port = lisp_vport(vport);
  49
  50         if (nla_put_u16(skb, OVS_TUNNEL_ATTR_DST_PORT, lisp_port->port_no))
  51                 return -EMSGSIZE;
  52         return 0;
  53 }
  54
  55 static int lisp_get_egress_tun_info(struct vport *vport, struct sk_buff *skb,
  56                                       struct dp_upcall_info *upcall)
  57 {
  58         struct lisp_port *lisp_port = lisp_vport(vport);
  59         struct net *net = ovs_dp_get_net(vport->dp);
  60         __be16 dport = htons(lisp_port->port_no);
  61         __be16 sport = udp_flow_src_port(net, skb, 1, USHRT_MAX, true);
  62
  63         return ovs_tunnel_get_egress_info(upcall, ovs_dp_get_net(vport->dp),
  64                                           skb, IPPROTO_UDP, sport, dport);
  65 }
  66
  67 static struct vport *lisp_tnl_create(const struct vport_parms *parms)
  68 {
  69         struct net *net = ovs_dp_get_net(parms->dp);
  70         struct nlattr *options = parms->options;
  71         struct lisp_port *lisp_port;
  72         struct net_device *dev;
  73         struct vport *vport;
  74         struct nlattr *a;
  75         u16 dst_port;
  76         int err;
  77
  78         if (!options) {
  79                 err = -EINVAL;
  80                 goto error;
  81         }
  82
  83         a = nla_find_nested(options, OVS_TUNNEL_ATTR_DST_PORT);
  84         if (a && nla_len(a) == sizeof(u16)) {
  85                 dst_port = nla_get_u16(a);
  86         } else {
  87                 /* Require destination port from userspace. */
  88                 err = -EINVAL;
  89                 goto error;
  90         }
  91
  92         vport = ovs_vport_alloc(sizeof(struct lisp_port),
  93                                 &ovs_lisp_vport_ops, parms);
  94         if (IS_ERR(vport))
  95                 return vport;
  96
  97         lisp_port = lisp_vport(vport);
  98         lisp_port->port_no = dst_port;
  99
 100         rtnl_lock();
 101         dev = lisp_dev_create_fb(net, parms->name, NET_NAME_USER, dst_port);
 102         if (IS_ERR(dev)) {
 103                 rtnl_unlock();
 104                 ovs_vport_free(vport);
 105                 return ERR_CAST(dev);
 106         }
 107
 108         dev_change_flags(dev, dev->flags | IFF_UP);
 109         rtnl_unlock();
 110         return vport;
 111 error:
 112         return ERR_PTR(err);
 113 }
 114
 115 static struct vport *lisp_create(const struct vport_parms *parms)
 116 {
 117         struct vport *vport;
 118
 119         vport = lisp_tnl_create(parms);
 120         if (IS_ERR(vport))
 121                 return vport;
 122
 123         return ovs_netdev_link(vport, parms->name);
 124 }
 125
 126 static struct vport_ops ovs_lisp_vport_ops = {
 127         .type           = OVS_VPORT_TYPE_LISP,
 128         .create         = lisp_create,
 129         .destroy        = ovs_netdev_tunnel_destroy,
 130         .get_options    = lisp_get_options,
 131         .send           = lisp_xmit,
 132         .get_egress_tun_info    = lisp_get_egress_tun_info,
 133 };
 134
 135 static int __init ovs_lisp_tnl_init(void)
 136 {
 137         return ovs_vport_ops_register(&ovs_lisp_vport_ops);
 138 }
 139
 140 static void __exit ovs_lisp_tnl_exit(void)
 141 {
 142         ovs_vport_ops_unregister(&ovs_lisp_vport_ops);
 143 }
 144
 145 module_init(ovs_lisp_tnl_init);
 146 module_exit(ovs_lisp_tnl_exit);
 147
 148 MODULE_DESCRIPTION("OVS: Lisp switching port");
 149 MODULE_LICENSE("GPL");
 150 MODULE_ALIAS("vport-type-105");