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1/*
2 * Copyright (c) 2014 Nicira, Inc.
3 * Copyright (c) 2013 Cisco Systems, Inc.
4 *
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.
8 *
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.
13 *
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
18 */
19
20#include <linux/kernel.h>
21#include <linux/skbuff.h>
22#include <linux/openvswitch.h>
23#include <linux/module.h>
24#include <net/udp.h>
25#include <net/ip_tunnels.h>
26#include <net/rtnetlink.h>
27#include <net/vxlan.h>
28
29#include "datapath.h"
30#include "vport.h"
31#include "vport-netdev.h"
32
33static struct vport_ops ovs_vxlan_netdev_vport_ops;
34
35static int vxlan_get_options(const struct vport *vport, struct sk_buff *skb)
36{
37 struct vxlan_dev *vxlan = netdev_priv(vport->dev);
38 __be16 dst_port = vxlan->cfg.dst_port;
39
40 if (nla_put_u16(skb, OVS_TUNNEL_ATTR_DST_PORT, ntohs(dst_port)))
41 return -EMSGSIZE;
42
43 if (vxlan->cfg.flags & VXLAN_F_GBP) {
44 struct nlattr *exts;
45
46 exts = nla_nest_start(skb, OVS_TUNNEL_ATTR_EXTENSION);
47 if (!exts)
48 return -EMSGSIZE;
49
50 if (vxlan->cfg.flags & VXLAN_F_GBP &&
51 nla_put_flag(skb, OVS_VXLAN_EXT_GBP))
52 return -EMSGSIZE;
53
54 nla_nest_end(skb, exts);
55 }
56
57 return 0;
58}
59
60static const struct nla_policy exts_policy[OVS_VXLAN_EXT_MAX + 1] = {
61 [OVS_VXLAN_EXT_GBP] = { .type = NLA_FLAG, },
62};
63
64static int vxlan_configure_exts(struct vport *vport, struct nlattr *attr,
65 struct vxlan_config *conf)
66{
67 struct nlattr *exts[OVS_VXLAN_EXT_MAX + 1];
68 int err;
69
70 if (nla_len(attr) < sizeof(struct nlattr))
71 return -EINVAL;
72
73 err = nla_parse_nested(exts, OVS_VXLAN_EXT_MAX, attr, exts_policy,
74 NULL);
75 if (err < 0)
76 return err;
77
78 if (exts[OVS_VXLAN_EXT_GBP])
79 conf->flags |= VXLAN_F_GBP;
80
81 return 0;
82}
83
84static struct vport *vxlan_tnl_create(const struct vport_parms *parms)
85{
86 struct net *net = ovs_dp_get_net(parms->dp);
87 struct nlattr *options = parms->options;
88 struct net_device *dev;
89 struct vport *vport;
90 struct nlattr *a;
91 int err;
92 struct vxlan_config conf = {
93 .no_share = true,
94 .flags = VXLAN_F_COLLECT_METADATA | VXLAN_F_UDP_ZERO_CSUM6_RX,
95 /* Don't restrict the packets that can be sent by MTU */
96 .mtu = IP_MAX_MTU,
97 };
98
99 if (!options) {
100 err = -EINVAL;
101 goto error;
102 }
103
104 a = nla_find_nested(options, OVS_TUNNEL_ATTR_DST_PORT);
105 if (a && nla_len(a) == sizeof(u16)) {
106 conf.dst_port = htons(nla_get_u16(a));
107 } else {
108 /* Require destination port from userspace. */
109 err = -EINVAL;
110 goto error;
111 }
112
113 vport = ovs_vport_alloc(0, &ovs_vxlan_netdev_vport_ops, parms);
114 if (IS_ERR(vport))
115 return vport;
116
117 a = nla_find_nested(options, OVS_TUNNEL_ATTR_EXTENSION);
118 if (a) {
119 err = vxlan_configure_exts(vport, a, &conf);
120 if (err) {
121 ovs_vport_free(vport);
122 goto error;
123 }
124 }
125
126 rtnl_lock();
127 dev = vxlan_dev_create(net, parms->name, NET_NAME_USER, &conf);
128 if (IS_ERR(dev)) {
129 rtnl_unlock();
130 ovs_vport_free(vport);
131 return ERR_CAST(dev);
132 }
133
134 err = dev_change_flags(dev, dev->flags | IFF_UP);
135 if (err < 0) {
136 rtnl_delete_link(dev);
137 rtnl_unlock();
138 ovs_vport_free(vport);
139 goto error;
140 }
141
142 rtnl_unlock();
143 return vport;
144error:
145 return ERR_PTR(err);
146}
147
148static struct vport *vxlan_create(const struct vport_parms *parms)
149{
150 struct vport *vport;
151
152 vport = vxlan_tnl_create(parms);
153 if (IS_ERR(vport))
154 return vport;
155
156 return ovs_netdev_link(vport, parms->name);
157}
158
159static struct vport_ops ovs_vxlan_netdev_vport_ops = {
160 .type = OVS_VPORT_TYPE_VXLAN,
161 .create = vxlan_create,
162 .destroy = ovs_netdev_tunnel_destroy,
163 .get_options = vxlan_get_options,
164 .send = dev_queue_xmit,
165};
166
167static int __init ovs_vxlan_tnl_init(void)
168{
169 return ovs_vport_ops_register(&ovs_vxlan_netdev_vport_ops);
170}
171
172static void __exit ovs_vxlan_tnl_exit(void)
173{
174 ovs_vport_ops_unregister(&ovs_vxlan_netdev_vport_ops);
175}
176
177module_init(ovs_vxlan_tnl_init);
178module_exit(ovs_vxlan_tnl_exit);
179
180MODULE_DESCRIPTION("OVS: VXLAN switching port");
181MODULE_LICENSE("GPL");
182MODULE_ALIAS("vport-type-4");
1/*
2 * Copyright (c) 2013 Nicira, Inc.
3 * Copyright (c) 2013 Cisco Systems, Inc.
4 *
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.
8 *
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.
13 *
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
18 */
19
20#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
21
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>
27
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>
39
40#include "datapath.h"
41#include "vport.h"
42
43/**
44 * struct vxlan_port - Keeps track of open UDP ports
45 * @vs: vxlan_sock created for the port.
46 * @name: vport name.
47 */
48struct vxlan_port {
49 struct vxlan_sock *vs;
50 char name[IFNAMSIZ];
51};
52
53static inline struct vxlan_port *vxlan_vport(const struct vport *vport)
54{
55 return vport_priv(vport);
56}
57
58/* Called with rcu_read_lock and BH disabled. */
59static void vxlan_rcv(struct vxlan_sock *vs, struct sk_buff *skb, __be32 vx_vni)
60{
61 struct ovs_key_ipv4_tunnel tun_key;
62 struct vport *vport = vs->data;
63 struct iphdr *iph;
64 __be64 key;
65
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);
70
71 ovs_vport_receive(vport, skb, &tun_key);
72}
73
74static int vxlan_get_options(const struct vport *vport, struct sk_buff *skb)
75{
76 struct vxlan_port *vxlan_port = vxlan_vport(vport);
77 __be16 dst_port = inet_sk(vxlan_port->vs->sock->sk)->inet_sport;
78
79 if (nla_put_u16(skb, OVS_TUNNEL_ATTR_DST_PORT, ntohs(dst_port)))
80 return -EMSGSIZE;
81 return 0;
82}
83
84static void vxlan_tnl_destroy(struct vport *vport)
85{
86 struct vxlan_port *vxlan_port = vxlan_vport(vport);
87
88 vxlan_sock_release(vxlan_port->vs);
89
90 ovs_vport_deferred_free(vport);
91}
92
93static struct vport *vxlan_tnl_create(const struct vport_parms *parms)
94{
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;
103
104 if (!options) {
105 err = -EINVAL;
106 goto error;
107 }
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;
115 }
116
117 vport = ovs_vport_alloc(sizeof(struct vxlan_port),
118 &ovs_vxlan_vport_ops, parms);
119 if (IS_ERR(vport))
120 return vport;
121
122 vxlan_port = vxlan_vport(vport);
123 strncpy(vxlan_port->name, parms->name, IFNAMSIZ);
124
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;
129 }
130 vxlan_port->vs = vs;
131
132 return vport;
133
134error:
135 return ERR_PTR(err);
136}
137
138static int vxlan_tnl_send(struct vport *vport, struct sk_buff *skb)
139{
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;
150
151 if (unlikely(!OVS_CB(skb)->tun_key)) {
152 err = -EINVAL;
153 goto error;
154 }
155
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;
163
164 rt = ip_route_output_key(net, &fl);
165 if (IS_ERR(rt)) {
166 err = PTR_ERR(rt);
167 goto error;
168 }
169
170 df = OVS_CB(skb)->tun_key->tun_flags & TUNNEL_DONT_FRAGMENT ?
171 htons(IP_DF) : 0;
172
173 skb->local_df = 1;
174
175 inet_get_local_port_range(net, &port_min, &port_max);
176 src_port = vxlan_src_port(port_min, port_max, skb);
177
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);
186error:
187 return err;
188}
189
190static const char *vxlan_get_name(const struct vport *vport)
191{
192 struct vxlan_port *vxlan_port = vxlan_vport(vport);
193 return vxlan_port->name;
194}
195
196const 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,
203};