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TOMOYO Linux Cross Reference
Linux/net/openvswitch/vport-vxlan.c

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  1 /*
  2  * Copyright (c) 2014 Nicira, Inc.
  3  * Copyright (c) 2013 Cisco Systems, Inc.
  4  *
  5  * This program is free software; you can redistribute it and/or
  6  * modify it under the terms of version 2 of the GNU General Public
  7  * License as published by the Free Software Foundation.
  8  *
  9  * This program is distributed in the hope that it will be useful, but
 10  * WITHOUT ANY WARRANTY; without even the implied warranty of
 11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 12  * General Public License for more details.
 13  *
 14  * You should have received a copy of the GNU General Public License
 15  * along with this program; if not, write to the Free Software
 16  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
 17  * 02110-1301, USA
 18  */
 19 
 20 #include <linux/kernel.h>
 21 #include <linux/skbuff.h>
 22 #include <linux/openvswitch.h>
 23 #include <linux/module.h>
 24 #include <net/udp.h>
 25 #include <net/ip_tunnels.h>
 26 #include <net/rtnetlink.h>
 27 #include <net/vxlan.h>
 28 
 29 #include "datapath.h"
 30 #include "vport.h"
 31 #include "vport-netdev.h"
 32 
 33 static struct vport_ops ovs_vxlan_netdev_vport_ops;
 34 
 35 static int vxlan_get_options(const struct vport *vport, struct sk_buff *skb)
 36 {
 37         struct vxlan_dev *vxlan = netdev_priv(vport->dev);
 38         __be16 dst_port = vxlan->cfg.dst_port;
 39 
 40         if (nla_put_u16(skb, OVS_TUNNEL_ATTR_DST_PORT, ntohs(dst_port)))
 41                 return -EMSGSIZE;
 42 
 43         if (vxlan->cfg.flags & VXLAN_F_GBP) {
 44                 struct nlattr *exts;
 45 
 46                 exts = nla_nest_start(skb, OVS_TUNNEL_ATTR_EXTENSION);
 47                 if (!exts)
 48                         return -EMSGSIZE;
 49 
 50                 if (vxlan->cfg.flags & VXLAN_F_GBP &&
 51                     nla_put_flag(skb, OVS_VXLAN_EXT_GBP))
 52                         return -EMSGSIZE;
 53 
 54                 nla_nest_end(skb, exts);
 55         }
 56 
 57         return 0;
 58 }
 59 
 60 static const struct nla_policy exts_policy[OVS_VXLAN_EXT_MAX + 1] = {
 61         [OVS_VXLAN_EXT_GBP]     = { .type = NLA_FLAG, },
 62 };
 63 
 64 static int vxlan_configure_exts(struct vport *vport, struct nlattr *attr,
 65                                 struct vxlan_config *conf)
 66 {
 67         struct nlattr *exts[OVS_VXLAN_EXT_MAX + 1];
 68         int err;
 69 
 70         if (nla_len(attr) < sizeof(struct nlattr))
 71                 return -EINVAL;
 72 
 73         err = nla_parse_nested(exts, OVS_VXLAN_EXT_MAX, attr, exts_policy,
 74                                NULL);
 75         if (err < 0)
 76                 return err;
 77 
 78         if (exts[OVS_VXLAN_EXT_GBP])
 79                 conf->flags |= VXLAN_F_GBP;
 80 
 81         return 0;
 82 }
 83 
 84 static struct vport *vxlan_tnl_create(const struct vport_parms *parms)
 85 {
 86         struct net *net = ovs_dp_get_net(parms->dp);
 87         struct nlattr *options = parms->options;
 88         struct net_device *dev;
 89         struct vport *vport;
 90         struct nlattr *a;
 91         int err;
 92         struct vxlan_config conf = {
 93                 .no_share = true,
 94                 .flags = VXLAN_F_COLLECT_METADATA | VXLAN_F_UDP_ZERO_CSUM6_RX,
 95                 /* Don't restrict the packets that can be sent by MTU */
 96                 .mtu = IP_MAX_MTU,
 97         };
 98 
 99         if (!options) {
100                 err = -EINVAL;
101                 goto error;
102         }
103 
104         a = nla_find_nested(options, OVS_TUNNEL_ATTR_DST_PORT);
105         if (a && nla_len(a) == sizeof(u16)) {
106                 conf.dst_port = htons(nla_get_u16(a));
107         } else {
108                 /* Require destination port from userspace. */
109                 err = -EINVAL;
110                 goto error;
111         }
112 
113         vport = ovs_vport_alloc(0, &ovs_vxlan_netdev_vport_ops, parms);
114         if (IS_ERR(vport))
115                 return vport;
116 
117         a = nla_find_nested(options, OVS_TUNNEL_ATTR_EXTENSION);
118         if (a) {
119                 err = vxlan_configure_exts(vport, a, &conf);
120                 if (err) {
121                         ovs_vport_free(vport);
122                         goto error;
123                 }
124         }
125 
126         rtnl_lock();
127         dev = vxlan_dev_create(net, parms->name, NET_NAME_USER, &conf);
128         if (IS_ERR(dev)) {
129                 rtnl_unlock();
130                 ovs_vport_free(vport);
131                 return ERR_CAST(dev);
132         }
133 
134         err = dev_change_flags(dev, dev->flags | IFF_UP);
135         if (err < 0) {
136                 rtnl_delete_link(dev);
137                 rtnl_unlock();
138                 ovs_vport_free(vport);
139                 goto error;
140         }
141 
142         rtnl_unlock();
143         return vport;
144 error:
145         return ERR_PTR(err);
146 }
147 
148 static struct vport *vxlan_create(const struct vport_parms *parms)
149 {
150         struct vport *vport;
151 
152         vport = vxlan_tnl_create(parms);
153         if (IS_ERR(vport))
154                 return vport;
155 
156         return ovs_netdev_link(vport, parms->name);
157 }
158 
159 static struct vport_ops ovs_vxlan_netdev_vport_ops = {
160         .type                   = OVS_VPORT_TYPE_VXLAN,
161         .create                 = vxlan_create,
162         .destroy                = ovs_netdev_tunnel_destroy,
163         .get_options            = vxlan_get_options,
164         .send                   = dev_queue_xmit,
165 };
166 
167 static int __init ovs_vxlan_tnl_init(void)
168 {
169         return ovs_vport_ops_register(&ovs_vxlan_netdev_vport_ops);
170 }
171 
172 static void __exit ovs_vxlan_tnl_exit(void)
173 {
174         ovs_vport_ops_unregister(&ovs_vxlan_netdev_vport_ops);
175 }
176 
177 module_init(ovs_vxlan_tnl_init);
178 module_exit(ovs_vxlan_tnl_exit);
179 
180 MODULE_DESCRIPTION("OVS: VXLAN switching port");
181 MODULE_LICENSE("GPL");
182 MODULE_ALIAS("vport-type-4");
183 

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