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>
26 #include <linux/net.h>
27 #include <linux/rculist.h>
28 #include <linux/udp.h>
33 #include <net/ip_tunnels.h>
34 #include <net/rtnetlink.h>
35 #include <net/route.h>
36 #include <net/dsfield.h>
37 #include <net/inet_ecn.h>
38 #include <net/net_namespace.h>
39 #include <net/netns/generic.h>
40 #include <net/vxlan.h>
46 * struct vxlan_port - Keeps track of open UDP ports
47 * @vs: vxlan_sock created for the port.
51 struct vxlan_sock *vs;
55 static inline struct vxlan_port *vxlan_vport(const struct vport *vport)
57 return vport_priv(vport);
60 /* Called with rcu_read_lock and BH disabled. */
61 static void vxlan_rcv(struct vxlan_sock *vs, struct sk_buff *skb, __be32 vx_vni)
63 struct ovs_tunnel_info tun_info;
64 struct vport *vport = vs->data;
68 /* Save outer tunnel values */
70 key = cpu_to_be64(ntohl(vx_vni) >> 8);
71 ovs_flow_tun_info_init(&tun_info, iph,
72 udp_hdr(skb)->source, udp_hdr(skb)->dest,
73 key, TUNNEL_KEY, NULL, 0);
75 ovs_vport_receive(vport, skb, &tun_info);
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, 0);
131 ovs_vport_free(vport);
142 static int vxlan_tnl_send(struct vport *vport, struct sk_buff *skb)
144 struct ovs_key_ipv4_tunnel *tun_key;
145 struct net *net = ovs_dp_get_net(vport->dp);
146 struct vxlan_port *vxlan_port = vxlan_vport(vport);
147 __be16 dst_port = inet_sport(vxlan_port->vs->sock->sk);
154 if (unlikely(!OVS_CB(skb)->egress_tun_info)) {
159 tun_key = &OVS_CB(skb)->egress_tun_info->tunnel;
162 saddr = tun_key->ipv4_src;
163 rt = find_route(ovs_dp_get_net(vport->dp),
164 &saddr, tun_key->ipv4_dst,
165 IPPROTO_UDP, tun_key->ipv4_tos,
172 df = tun_key->tun_flags & TUNNEL_DONT_FRAGMENT ? htons(IP_DF) : 0;
175 src_port = udp_flow_src_port(net, skb, 0, 0, true);
177 err = vxlan_xmit_skb(vxlan_port->vs, rt, skb,
178 saddr, tun_key->ipv4_dst,
180 tun_key->ipv4_ttl, df,
182 htonl(be64_to_cpu(tun_key->tun_id) << 8));
191 static int vxlan_get_egress_tun_info(struct vport *vport, struct sk_buff *skb,
192 struct ovs_tunnel_info *egress_tun_info)
194 struct net *net = ovs_dp_get_net(vport->dp);
195 struct vxlan_port *vxlan_port = vxlan_vport(vport);
196 __be16 dst_port = inet_sport(vxlan_port->vs->sock->sk);
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 const 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,