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

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  1 // SPDX-License-Identifier: GPL-2.0-only
  2 /*
  3  * Copyright (c) 2014 Nicira, Inc.
  4  * Copyright (c) 2013 Cisco Systems, Inc.
  5  */
  6 
  7 #include <linux/kernel.h>
  8 #include <linux/skbuff.h>
  9 #include <linux/openvswitch.h>
 10 #include <linux/module.h>
 11 #include <net/udp.h>
 12 #include <net/ip_tunnels.h>
 13 #include <net/rtnetlink.h>
 14 #include <net/vxlan.h>
 15 
 16 #include "datapath.h"
 17 #include "vport.h"
 18 #include "vport-netdev.h"
 19 
 20 static struct vport_ops ovs_vxlan_netdev_vport_ops;
 21 
 22 static int vxlan_get_options(const struct vport *vport, struct sk_buff *skb)
 23 {
 24         struct vxlan_dev *vxlan = netdev_priv(vport->dev);
 25         __be16 dst_port = vxlan->cfg.dst_port;
 26 
 27         if (nla_put_u16(skb, OVS_TUNNEL_ATTR_DST_PORT, ntohs(dst_port)))
 28                 return -EMSGSIZE;
 29 
 30         if (vxlan->cfg.flags & VXLAN_F_GBP) {
 31                 struct nlattr *exts;
 32 
 33                 exts = nla_nest_start_noflag(skb, OVS_TUNNEL_ATTR_EXTENSION);
 34                 if (!exts)
 35                         return -EMSGSIZE;
 36 
 37                 if (vxlan->cfg.flags & VXLAN_F_GBP &&
 38                     nla_put_flag(skb, OVS_VXLAN_EXT_GBP))
 39                         return -EMSGSIZE;
 40 
 41                 nla_nest_end(skb, exts);
 42         }
 43 
 44         return 0;
 45 }
 46 
 47 static const struct nla_policy exts_policy[OVS_VXLAN_EXT_MAX + 1] = {
 48         [OVS_VXLAN_EXT_GBP]     = { .type = NLA_FLAG, },
 49 };
 50 
 51 static int vxlan_configure_exts(struct vport *vport, struct nlattr *attr,
 52                                 struct vxlan_config *conf)
 53 {
 54         struct nlattr *exts[OVS_VXLAN_EXT_MAX + 1];
 55         int err;
 56 
 57         if (nla_len(attr) < sizeof(struct nlattr))
 58                 return -EINVAL;
 59 
 60         err = nla_parse_nested_deprecated(exts, OVS_VXLAN_EXT_MAX, attr,
 61                                           exts_policy, NULL);
 62         if (err < 0)
 63                 return err;
 64 
 65         if (exts[OVS_VXLAN_EXT_GBP])
 66                 conf->flags |= VXLAN_F_GBP;
 67 
 68         return 0;
 69 }
 70 
 71 static struct vport *vxlan_tnl_create(const struct vport_parms *parms)
 72 {
 73         struct net *net = ovs_dp_get_net(parms->dp);
 74         struct nlattr *options = parms->options;
 75         struct net_device *dev;
 76         struct vport *vport;
 77         struct nlattr *a;
 78         int err;
 79         struct vxlan_config conf = {
 80                 .no_share = true,
 81                 .flags = VXLAN_F_COLLECT_METADATA | VXLAN_F_UDP_ZERO_CSUM6_RX,
 82                 /* Don't restrict the packets that can be sent by MTU */
 83                 .mtu = IP_MAX_MTU,
 84         };
 85 
 86         if (!options) {
 87                 err = -EINVAL;
 88                 goto error;
 89         }
 90 
 91         a = nla_find_nested(options, OVS_TUNNEL_ATTR_DST_PORT);
 92         if (a && nla_len(a) == sizeof(u16)) {
 93                 conf.dst_port = htons(nla_get_u16(a));
 94         } else {
 95                 /* Require destination port from userspace. */
 96                 err = -EINVAL;
 97                 goto error;
 98         }
 99 
100         vport = ovs_vport_alloc(0, &ovs_vxlan_netdev_vport_ops, parms);
101         if (IS_ERR(vport))
102                 return vport;
103 
104         a = nla_find_nested(options, OVS_TUNNEL_ATTR_EXTENSION);
105         if (a) {
106                 err = vxlan_configure_exts(vport, a, &conf);
107                 if (err) {
108                         ovs_vport_free(vport);
109                         goto error;
110                 }
111         }
112 
113         rtnl_lock();
114         dev = vxlan_dev_create(net, parms->name, NET_NAME_USER, &conf);
115         if (IS_ERR(dev)) {
116                 rtnl_unlock();
117                 ovs_vport_free(vport);
118                 return ERR_CAST(dev);
119         }
120 
121         err = dev_change_flags(dev, dev->flags | IFF_UP, NULL);
122         if (err < 0) {
123                 rtnl_delete_link(dev);
124                 rtnl_unlock();
125                 ovs_vport_free(vport);
126                 goto error;
127         }
128 
129         rtnl_unlock();
130         return vport;
131 error:
132         return ERR_PTR(err);
133 }
134 
135 static struct vport *vxlan_create(const struct vport_parms *parms)
136 {
137         struct vport *vport;
138 
139         vport = vxlan_tnl_create(parms);
140         if (IS_ERR(vport))
141                 return vport;
142 
143         return ovs_netdev_link(vport, parms->name);
144 }
145 
146 static struct vport_ops ovs_vxlan_netdev_vport_ops = {
147         .type                   = OVS_VPORT_TYPE_VXLAN,
148         .create                 = vxlan_create,
149         .destroy                = ovs_netdev_tunnel_destroy,
150         .get_options            = vxlan_get_options,
151         .send                   = dev_queue_xmit,
152 };
153 
154 static int __init ovs_vxlan_tnl_init(void)
155 {
156         return ovs_vport_ops_register(&ovs_vxlan_netdev_vport_ops);
157 }
158 
159 static void __exit ovs_vxlan_tnl_exit(void)
160 {
161         ovs_vport_ops_unregister(&ovs_vxlan_netdev_vport_ops);
162 }
163 
164 module_init(ovs_vxlan_tnl_init);
165 module_exit(ovs_vxlan_tnl_exit);
166 
167 MODULE_DESCRIPTION("OVS: VXLAN switching port");
168 MODULE_LICENSE("GPL");
169 MODULE_ALIAS("vport-type-4");
170 

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