2 * Copyright (c) 2013 Nicira, Inc.
3 * Copyright (c) 2013 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 * struct vxlan_port - Keeps track of open UDP ports
49 * @vs: vxlan_sock created for the port.
53 struct vxlan_sock *vs;
57 static inline struct vxlan_port *vxlan_vport(const struct vport *vport)
59 return vport_priv(vport);
62 /* Called with rcu_read_lock and BH disabled. */
63 static void vxlan_rcv(struct vxlan_sock *vs, struct sk_buff *skb, __be32 vx_vni)
65 struct ovs_key_ipv4_tunnel tun_key;
66 struct vport *vport = vs->data;
70 /* Save outer tunnel values */
72 key = cpu_to_be64(ntohl(vx_vni) >> 8);
73 ovs_flow_tun_key_init(&tun_key, iph, key, TUNNEL_KEY);
75 ovs_vport_receive(vport, skb, &tun_key);
78 static int vxlan_get_options(const struct vport *vport, struct sk_buff *skb)
80 struct vxlan_port *vxlan_port = vxlan_vport(vport);
81 __be16 dst_port = inet_sport(vxlan_port->vs->sock->sk);
83 if (nla_put_u16(skb, OVS_TUNNEL_ATTR_DST_PORT, ntohs(dst_port)))
88 static void vxlan_tnl_destroy(struct vport *vport)
90 struct vxlan_port *vxlan_port = vxlan_vport(vport);
92 vxlan_sock_release(vxlan_port->vs);
94 ovs_vport_deferred_free(vport);
97 static struct vport *vxlan_tnl_create(const struct vport_parms *parms)
99 struct net *net = ovs_dp_get_net(parms->dp);
100 struct nlattr *options = parms->options;
101 struct vxlan_port *vxlan_port;
102 struct vxlan_sock *vs;
112 a = nla_find_nested(options, OVS_TUNNEL_ATTR_DST_PORT);
113 if (a && nla_len(a) == sizeof(u16)) {
114 dst_port = nla_get_u16(a);
116 /* Require destination port from userspace. */
121 vport = ovs_vport_alloc(sizeof(struct vxlan_port),
122 &ovs_vxlan_vport_ops, parms);
126 vxlan_port = vxlan_vport(vport);
127 strncpy(vxlan_port->name, parms->name, IFNAMSIZ);
129 vs = vxlan_sock_add(net, htons(dst_port), vxlan_rcv, vport, true);
131 ovs_vport_free(vport);
142 static int vxlan_tnl_send(struct vport *vport, struct sk_buff *skb)
144 struct vxlan_port *vxlan_port = vxlan_vport(vport);
145 __be16 dst_port = inet_sport(vxlan_port->vs->sock->sk);
146 struct net *net = ovs_dp_get_net(vport->dp);
155 if (unlikely(!OVS_CB(skb)->tun_key)) {
160 forward_ip_summed(skb, true);
163 saddr = OVS_CB(skb)->tun_key->ipv4_src;
164 rt = find_route(ovs_dp_get_net(vport->dp),
166 OVS_CB(skb)->tun_key->ipv4_dst,
168 OVS_CB(skb)->tun_key->ipv4_tos,
175 df = OVS_CB(skb)->tun_key->tun_flags & TUNNEL_DONT_FRAGMENT ?
180 inet_get_local_port_range(&port_min, &port_max);
181 src_port = vxlan_src_port(port_min, port_max, skb);
183 err = vxlan_xmit_skb(net, vxlan_port->vs, rt, skb,
184 saddr, OVS_CB(skb)->tun_key->ipv4_dst,
185 OVS_CB(skb)->tun_key->ipv4_tos,
186 OVS_CB(skb)->tun_key->ipv4_ttl, df,
188 htonl(be64_to_cpu(OVS_CB(skb)->tun_key->tun_id) << 8));
195 static const char *vxlan_get_name(const struct vport *vport)
197 struct vxlan_port *vxlan_port = vxlan_vport(vport);
198 return vxlan_port->name;
201 const struct vport_ops ovs_vxlan_vport_ops = {
202 .type = OVS_VPORT_TYPE_VXLAN,
203 .create = vxlan_tnl_create,
204 .destroy = vxlan_tnl_destroy,
205 .get_name = vxlan_get_name,
206 .get_options = vxlan_get_options,
207 .send = vxlan_tnl_send,
210 #warning VXLAN tunneling will not be available on kernels before 2.6.26
211 #endif /* Linux kernel < 2.6.26 */