Merge tag 'fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/arm...
[linux-2.6.git] / net / openvswitch / vport-vxlan.c
blobe797a50ac2beec3a019bacf15e2e7c593355a46f
1 /*
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
17 * 02110-1301, USA
20 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
22 #include <linux/in.h>
23 #include <linux/ip.h>
24 #include <linux/net.h>
25 #include <linux/rculist.h>
26 #include <linux/udp.h>
28 #include <net/icmp.h>
29 #include <net/ip.h>
30 #include <net/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>
40 #include "datapath.h"
41 #include "vport.h"
43 /**
44 * struct vxlan_port - Keeps track of open UDP ports
45 * @vs: vxlan_sock created for the port.
46 * @name: vport name.
48 struct vxlan_port {
49 struct vxlan_sock *vs;
50 char name[IFNAMSIZ];
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;
63 struct iphdr *iph;
64 __be64 key;
66 /* Save outer tunnel values */
67 iph = ip_hdr(skb);
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)))
80 return -EMSGSIZE;
81 return 0;
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;
99 struct vport *vport;
100 struct nlattr *a;
101 u16 dst_port;
102 int err;
104 if (!options) {
105 err = -EINVAL;
106 goto error;
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);
111 } else {
112 /* Require destination port from userspace. */
113 err = -EINVAL;
114 goto error;
117 vport = ovs_vport_alloc(sizeof(struct vxlan_port),
118 &ovs_vxlan_vport_ops, parms);
119 if (IS_ERR(vport))
120 return vport;
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);
126 if (IS_ERR(vs)) {
127 ovs_vport_free(vport);
128 return (void *)vs;
130 vxlan_port->vs = vs;
132 return vport;
134 error:
135 return ERR_PTR(err);
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;
143 struct rtable *rt;
144 struct flowi4 fl;
145 __be16 src_port;
146 int port_min;
147 int port_max;
148 __be16 df;
149 int err;
151 if (unlikely(!OVS_CB(skb)->tun_key)) {
152 err = -EINVAL;
153 goto error;
156 /* Route lookup */
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);
165 if (IS_ERR(rt)) {
166 err = PTR_ERR(rt);
167 goto error;
170 df = OVS_CB(skb)->tun_key->tun_flags & TUNNEL_DONT_FRAGMENT ?
171 htons(IP_DF) : 0;
173 skb->local_df = 1;
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,
182 src_port, dst_port,
183 htonl(be64_to_cpu(OVS_CB(skb)->tun_key->tun_id) << 8));
184 if (err < 0)
185 ip_rt_put(rt);
186 error:
187 return err;
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,