2 * Copyright (c) 2014 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
24 #include <linux/net.h>
25 #include <linux/rculist.h>
26 #include <linux/udp.h>
27 #include <linux/module.h>
32 #include <net/ip_tunnels.h>
33 #include <net/rtnetlink.h>
34 #include <net/route.h>
35 #include <net/dsfield.h>
36 #include <net/inet_ecn.h>
37 #include <net/net_namespace.h>
38 #include <net/netns/generic.h>
39 #include <net/vxlan.h>
45 * struct vxlan_port - Keeps track of open UDP ports
46 * @vs: vxlan_sock created for the port.
50 struct vxlan_sock *vs;
54 static struct vport_ops ovs_vxlan_vport_ops;
56 static inline struct vxlan_port *vxlan_vport(const struct vport *vport)
58 return vport_priv(vport);
61 /* Called with rcu_read_lock and BH disabled. */
62 static void vxlan_rcv(struct vxlan_sock *vs, struct sk_buff *skb, __be32 vx_vni)
64 struct ovs_tunnel_info tun_info;
65 struct vport *vport = vs->data;
69 /* Save outer tunnel values */
71 key = cpu_to_be64(ntohl(vx_vni) >> 8);
72 ovs_flow_tun_info_init(&tun_info, iph,
73 udp_hdr(skb)->source, udp_hdr(skb)->dest,
74 key, TUNNEL_KEY, NULL, 0);
76 ovs_vport_receive(vport, skb, &tun_info);
79 static int vxlan_get_options(const struct vport *vport, struct sk_buff *skb)
81 struct vxlan_port *vxlan_port = vxlan_vport(vport);
82 __be16 dst_port = inet_sk(vxlan_port->vs->sock->sk)->inet_sport;
84 if (nla_put_u16(skb, OVS_TUNNEL_ATTR_DST_PORT, ntohs(dst_port)))
89 static void vxlan_tnl_destroy(struct vport *vport)
91 struct vxlan_port *vxlan_port = vxlan_vport(vport);
93 vxlan_sock_release(vxlan_port->vs);
95 ovs_vport_deferred_free(vport);
98 static struct vport *vxlan_tnl_create(const struct vport_parms *parms)
100 struct net *net = ovs_dp_get_net(parms->dp);
101 struct nlattr *options = parms->options;
102 struct vxlan_port *vxlan_port;
103 struct vxlan_sock *vs;
113 a = nla_find_nested(options, OVS_TUNNEL_ATTR_DST_PORT);
114 if (a && nla_len(a) == sizeof(u16)) {
115 dst_port = nla_get_u16(a);
117 /* Require destination port from userspace. */
122 vport = ovs_vport_alloc(sizeof(struct vxlan_port),
123 &ovs_vxlan_vport_ops, parms);
127 vxlan_port = vxlan_vport(vport);
128 strncpy(vxlan_port->name, parms->name, IFNAMSIZ);
130 vs = vxlan_sock_add(net, htons(dst_port), vxlan_rcv, vport, true, 0);
132 ovs_vport_free(vport);
143 static int vxlan_tnl_send(struct vport *vport, struct sk_buff *skb)
145 struct net *net = ovs_dp_get_net(vport->dp);
146 struct vxlan_port *vxlan_port = vxlan_vport(vport);
147 __be16 dst_port = inet_sk(vxlan_port->vs->sock->sk)->inet_sport;
148 const struct ovs_key_ipv4_tunnel *tun_key;
155 if (unlikely(!OVS_CB(skb)->egress_tun_info)) {
160 tun_key = &OVS_CB(skb)->egress_tun_info->tunnel;
161 rt = ovs_tunnel_route_lookup(net, tun_key, skb->mark, &fl, IPPROTO_UDP);
167 df = tun_key->tun_flags & TUNNEL_DONT_FRAGMENT ?
172 src_port = udp_flow_src_port(net, skb, 0, 0, true);
174 err = vxlan_xmit_skb(vxlan_port->vs, rt, skb,
175 fl.saddr, tun_key->ipv4_dst,
176 tun_key->ipv4_tos, tun_key->ipv4_ttl, df,
178 htonl(be64_to_cpu(tun_key->tun_id) << 8),
188 static int vxlan_get_egress_tun_info(struct vport *vport, struct sk_buff *skb,
189 struct ovs_tunnel_info *egress_tun_info)
191 struct net *net = ovs_dp_get_net(vport->dp);
192 struct vxlan_port *vxlan_port = vxlan_vport(vport);
193 __be16 dst_port = inet_sk(vxlan_port->vs->sock->sk)->inet_sport;
198 inet_get_local_port_range(net, &port_min, &port_max);
199 src_port = udp_flow_src_port(net, skb, 0, 0, true);
201 return ovs_tunnel_get_egress_info(egress_tun_info, net,
202 OVS_CB(skb)->egress_tun_info,
203 IPPROTO_UDP, skb->mark,
207 static const char *vxlan_get_name(const struct vport *vport)
209 struct vxlan_port *vxlan_port = vxlan_vport(vport);
210 return vxlan_port->name;
213 static struct vport_ops ovs_vxlan_vport_ops = {
214 .type = OVS_VPORT_TYPE_VXLAN,
215 .create = vxlan_tnl_create,
216 .destroy = vxlan_tnl_destroy,
217 .get_name = vxlan_get_name,
218 .get_options = vxlan_get_options,
219 .send = vxlan_tnl_send,
220 .get_egress_tun_info = vxlan_get_egress_tun_info,
221 .owner = THIS_MODULE,
224 static int __init ovs_vxlan_tnl_init(void)
226 return ovs_vport_ops_register(&ovs_vxlan_vport_ops);
229 static void __exit ovs_vxlan_tnl_exit(void)
231 ovs_vport_ops_unregister(&ovs_vxlan_vport_ops);
234 module_init(ovs_vxlan_tnl_init);
235 module_exit(ovs_vxlan_tnl_exit);
237 MODULE_DESCRIPTION("OVS: VXLAN switching port");
238 MODULE_LICENSE("GPL");
239 MODULE_ALIAS("vport-type-4");