2 * Copyright (c) 2011 Nicira, Inc.
3 * Copyright (c) 2012 Cisco Systems, Inc.
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.
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.
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
20 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
22 #include <linux/version.h>
23 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,26)
27 #include <linux/net.h>
28 #include <linux/rculist.h>
29 #include <linux/udp.h>
34 #include <net/ip_tunnels.h>
36 #include <net/rtnetlink.h>
37 #include <net/route.h>
38 #include <net/dsfield.h>
39 #include <net/inet_ecn.h>
40 #include <net/net_namespace.h>
41 #include <net/netns/generic.h>
42 #include <net/vxlan.h>
48 #define OVS_VXLAN_RCV_PRIORITY 8
51 * struct vxlan_port - Keeps track of open UDP ports
52 * @vh: vxlan_handler created for the port.
56 struct vxlan_handler *vh;
60 static inline struct vxlan_port *vxlan_vport(const struct vport *vport)
62 return vport_priv(vport);
65 /* Called with rcu_read_lock and BH disabled. */
66 static int vxlan_rcv(struct vxlan_handler *vh, struct sk_buff *skb, __be32 vx_vni)
68 struct vport *vport = vh->data;
70 struct ovs_key_ipv4_tunnel tun_key;
73 /* Save outer tunnel values */
75 key = cpu_to_be64(ntohl(vx_vni) >> 8);
76 tnl_tun_key_init(&tun_key, iph, key, TUNNEL_KEY);
78 ovs_vport_receive(vport, skb, &tun_key);
82 static int vxlan_get_options(const struct vport *vport, struct sk_buff *skb)
84 struct vxlan_port *vxlan_port = vxlan_vport(vport);
85 __be16 dst_port = inet_sport(vxlan_port->vh->vs->sock->sk);
87 if (nla_put_u16(skb, OVS_TUNNEL_ATTR_DST_PORT, ntohs(dst_port)))
92 static void vxlan_tnl_destroy(struct vport *vport)
94 struct vxlan_port *vxlan_port = vxlan_vport(vport);
96 vxlan_handler_put(vxlan_port->vh);
98 ovs_vport_deferred_free(vport);
101 static struct vport *vxlan_tnl_create(const struct vport_parms *parms)
103 struct net *net = ovs_dp_get_net(parms->dp);
104 struct nlattr *options = parms->options;
105 struct vxlan_port *vxlan_port;
106 struct vxlan_handler *vh;
116 a = nla_find_nested(options, OVS_TUNNEL_ATTR_DST_PORT);
117 if (a && nla_len(a) == sizeof(u16)) {
118 dst_port = nla_get_u16(a);
120 /* Require destination port from userspace. */
125 vport = ovs_vport_alloc(sizeof(struct vxlan_port),
126 &ovs_vxlan_vport_ops, parms);
130 vxlan_port = vxlan_vport(vport);
131 strncpy(vxlan_port->name, parms->name, IFNAMSIZ);
133 vh = vxlan_handler_add(net, htons(dst_port), vxlan_rcv,
134 vport, OVS_VXLAN_RCV_PRIORITY, true);
136 ovs_vport_free(vport);
147 static int vxlan_tnl_send(struct vport *vport, struct sk_buff *skb)
149 struct vxlan_port *vxlan_port = vxlan_vport(vport);
150 __be16 dst_port = inet_sport(vxlan_port->vh->vs->sock->sk);
151 struct net *net = ovs_dp_get_net(vport->dp);
160 if (unlikely(!OVS_CB(skb)->tun_key)) {
165 forward_ip_summed(skb, true);
168 saddr = OVS_CB(skb)->tun_key->ipv4_src;
169 rt = find_route(ovs_dp_get_net(vport->dp),
171 OVS_CB(skb)->tun_key->ipv4_dst,
173 OVS_CB(skb)->tun_key->ipv4_tos,
180 df = OVS_CB(skb)->tun_key->tun_flags & TUNNEL_DONT_FRAGMENT ?
185 inet_get_local_port_range(&port_min, &port_max);
186 src_port = vxlan_src_port(port_min, port_max, skb);
188 err = vxlan_xmit_skb(net, vxlan_port->vh, rt, skb,
189 saddr, OVS_CB(skb)->tun_key->ipv4_dst,
190 OVS_CB(skb)->tun_key->ipv4_tos,
191 OVS_CB(skb)->tun_key->ipv4_ttl, df,
193 htonl(be64_to_cpu(OVS_CB(skb)->tun_key->tun_id) << 8));
200 static const char *vxlan_get_name(const struct vport *vport)
202 struct vxlan_port *vxlan_port = vxlan_vport(vport);
203 return vxlan_port->name;
206 const struct vport_ops ovs_vxlan_vport_ops = {
207 .type = OVS_VPORT_TYPE_VXLAN,
208 .create = vxlan_tnl_create,
209 .destroy = vxlan_tnl_destroy,
210 .get_name = vxlan_get_name,
211 .get_options = vxlan_get_options,
212 .send = vxlan_tnl_send,
215 #warning VXLAN tunneling will not be available on kernels before 2.6.26
216 #endif /* Linux kernel < 2.6.26 */