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
24 #include <linux/net.h>
25 #include <linux/rculist.h>
26 #include <linux/udp.h>
31 #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 inline struct vxlan_port *vxlan_vport(const struct vport *vport)
56 return vport_priv(vport);
59 /* Called with rcu_read_lock and BH disabled. */
60 static void vxlan_rcv(struct vxlan_sock *vs, struct sk_buff *skb, __be32 vx_vni)
62 struct ovs_key_ipv4_tunnel tun_key;
63 struct vport *vport = vs->data;
67 /* Save outer tunnel values */
69 key = cpu_to_be64(ntohl(vx_vni) >> 8);
70 ovs_flow_tun_key_init(&tun_key, iph, key, TUNNEL_KEY);
72 ovs_vport_receive(vport, skb, &tun_key);
75 static int vxlan_get_options(const struct vport *vport, struct sk_buff *skb)
77 struct vxlan_port *vxlan_port = vxlan_vport(vport);
78 __be16 dst_port = inet_sk(vxlan_port->vs->sock->sk)->inet_sport;
80 if (nla_put_u16(skb, OVS_TUNNEL_ATTR_DST_PORT, ntohs(dst_port)))
85 static void vxlan_tnl_destroy(struct vport *vport)
87 struct vxlan_port *vxlan_port = vxlan_vport(vport);
89 vxlan_sock_release(vxlan_port->vs);
91 ovs_vport_deferred_free(vport);
94 static struct vport *vxlan_tnl_create(const struct vport_parms *parms)
96 struct net *net = ovs_dp_get_net(parms->dp);
97 struct nlattr *options = parms->options;
98 struct vxlan_port *vxlan_port;
99 struct vxlan_sock *vs;
109 a = nla_find_nested(options, OVS_TUNNEL_ATTR_DST_PORT);
110 if (a && nla_len(a) == sizeof(u16)) {
111 dst_port = nla_get_u16(a);
113 /* Require destination port from userspace. */
118 vport = ovs_vport_alloc(sizeof(struct vxlan_port),
119 &ovs_vxlan_vport_ops, parms);
123 vxlan_port = vxlan_vport(vport);
124 strncpy(vxlan_port->name, parms->name, IFNAMSIZ);
126 vs = vxlan_sock_add(net, htons(dst_port), vxlan_rcv, vport, true, false);
128 ovs_vport_free(vport);
139 static int vxlan_tnl_send(struct vport *vport, struct sk_buff *skb)
141 struct net *net = ovs_dp_get_net(vport->dp);
142 struct vxlan_port *vxlan_port = vxlan_vport(vport);
143 __be16 dst_port = inet_sk(vxlan_port->vs->sock->sk)->inet_sport;
152 if (unlikely(!OVS_CB(skb)->tun_key)) {
158 memset(&fl, 0, sizeof(fl));
159 fl.daddr = OVS_CB(skb)->tun_key->ipv4_dst;
160 fl.saddr = OVS_CB(skb)->tun_key->ipv4_src;
161 fl.flowi4_tos = RT_TOS(OVS_CB(skb)->tun_key->ipv4_tos);
162 fl.flowi4_mark = skb->mark;
163 fl.flowi4_proto = IPPROTO_UDP;
165 rt = ip_route_output_key(net, &fl);
171 df = OVS_CB(skb)->tun_key->tun_flags & TUNNEL_DONT_FRAGMENT ?
176 inet_get_local_port_range(&port_min, &port_max);
177 src_port = vxlan_src_port(port_min, port_max, skb);
179 err = vxlan_xmit_skb(vxlan_port->vs, rt, skb,
180 fl.saddr, OVS_CB(skb)->tun_key->ipv4_dst,
181 OVS_CB(skb)->tun_key->ipv4_tos,
182 OVS_CB(skb)->tun_key->ipv4_ttl, df,
184 htonl(be64_to_cpu(OVS_CB(skb)->tun_key->tun_id) << 8));
191 static const char *vxlan_get_name(const struct vport *vport)
193 struct vxlan_port *vxlan_port = vxlan_vport(vport);
194 return vxlan_port->name;
197 const struct vport_ops ovs_vxlan_vport_ops = {
198 .type = OVS_VPORT_TYPE_VXLAN,
199 .create = vxlan_tnl_create,
200 .destroy = vxlan_tnl_destroy,
201 .get_name = vxlan_get_name,
202 .get_options = vxlan_get_options,
203 .send = vxlan_tnl_send,