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Linux/net/openvswitch/vport-geneve.c

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  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");
145 

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