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>
32 #include <net/rtnetlink.h>
33 #include <net/route.h>
34 #include <net/dsfield.h>
35 #include <net/inet_ecn.h>
36 #include <net/net_namespace.h>
37 #include <net/netns/generic.h>
38 #include <net/vxlan.h>
44 * struct vxlan_port - Keeps track of open UDP ports
45 * @vs: vxlan_sock created for the port.
49 struct vxlan_sock
*vs
;
53 static inline struct vxlan_port
*vxlan_vport(const struct vport
*vport
)
55 return vport_priv(vport
);
58 /* Called with rcu_read_lock and BH disabled. */
59 static void vxlan_rcv(struct vxlan_sock
*vs
, struct sk_buff
*skb
, __be32 vx_vni
)
61 struct ovs_key_ipv4_tunnel tun_key
;
62 struct vport
*vport
= vs
->data
;
66 /* Save outer tunnel values */
68 key
= cpu_to_be64(ntohl(vx_vni
) >> 8);
69 ovs_flow_tun_key_init(&tun_key
, iph
, key
, TUNNEL_KEY
);
71 ovs_vport_receive(vport
, skb
, &tun_key
);
74 static int vxlan_get_options(const struct vport
*vport
, struct sk_buff
*skb
)
76 struct vxlan_port
*vxlan_port
= vxlan_vport(vport
);
77 __be16 dst_port
= inet_sk(vxlan_port
->vs
->sock
->sk
)->inet_sport
;
79 if (nla_put_u16(skb
, OVS_TUNNEL_ATTR_DST_PORT
, ntohs(dst_port
)))
84 static void vxlan_tnl_destroy(struct vport
*vport
)
86 struct vxlan_port
*vxlan_port
= vxlan_vport(vport
);
88 vxlan_sock_release(vxlan_port
->vs
);
90 ovs_vport_deferred_free(vport
);
93 static struct vport
*vxlan_tnl_create(const struct vport_parms
*parms
)
95 struct net
*net
= ovs_dp_get_net(parms
->dp
);
96 struct nlattr
*options
= parms
->options
;
97 struct vxlan_port
*vxlan_port
;
98 struct vxlan_sock
*vs
;
108 a
= nla_find_nested(options
, OVS_TUNNEL_ATTR_DST_PORT
);
109 if (a
&& nla_len(a
) == sizeof(u16
)) {
110 dst_port
= nla_get_u16(a
);
112 /* Require destination port from userspace. */
117 vport
= ovs_vport_alloc(sizeof(struct vxlan_port
),
118 &ovs_vxlan_vport_ops
, parms
);
122 vxlan_port
= vxlan_vport(vport
);
123 strncpy(vxlan_port
->name
, parms
->name
, IFNAMSIZ
);
125 vs
= vxlan_sock_add(net
, htons(dst_port
), vxlan_rcv
, vport
, true, false);
127 ovs_vport_free(vport
);
138 static int vxlan_tnl_send(struct vport
*vport
, struct sk_buff
*skb
)
140 struct net
*net
= ovs_dp_get_net(vport
->dp
);
141 struct vxlan_port
*vxlan_port
= vxlan_vport(vport
);
142 __be16 dst_port
= inet_sk(vxlan_port
->vs
->sock
->sk
)->inet_sport
;
151 if (unlikely(!OVS_CB(skb
)->tun_key
)) {
157 memset(&fl
, 0, sizeof(fl
));
158 fl
.daddr
= OVS_CB(skb
)->tun_key
->ipv4_dst
;
159 fl
.saddr
= OVS_CB(skb
)->tun_key
->ipv4_src
;
160 fl
.flowi4_tos
= RT_TOS(OVS_CB(skb
)->tun_key
->ipv4_tos
);
161 fl
.flowi4_mark
= skb
->mark
;
162 fl
.flowi4_proto
= IPPROTO_UDP
;
164 rt
= ip_route_output_key(net
, &fl
);
170 df
= OVS_CB(skb
)->tun_key
->tun_flags
& TUNNEL_DONT_FRAGMENT
?
175 inet_get_local_port_range(net
, &port_min
, &port_max
);
176 src_port
= vxlan_src_port(port_min
, port_max
, skb
);
178 err
= vxlan_xmit_skb(vxlan_port
->vs
, rt
, skb
,
179 fl
.saddr
, OVS_CB(skb
)->tun_key
->ipv4_dst
,
180 OVS_CB(skb
)->tun_key
->ipv4_tos
,
181 OVS_CB(skb
)->tun_key
->ipv4_ttl
, df
,
183 htonl(be64_to_cpu(OVS_CB(skb
)->tun_key
->tun_id
) << 8));
190 static const char *vxlan_get_name(const struct vport
*vport
)
192 struct vxlan_port
*vxlan_port
= vxlan_vport(vport
);
193 return vxlan_port
->name
;
196 const struct vport_ops ovs_vxlan_vport_ops
= {
197 .type
= OVS_VPORT_TYPE_VXLAN
,
198 .create
= vxlan_tnl_create
,
199 .destroy
= vxlan_tnl_destroy
,
200 .get_name
= vxlan_get_name
,
201 .get_options
= vxlan_get_options
,
202 .send
= vxlan_tnl_send
,