2 * Copyright (c) 2014 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>
27 #include <linux/module.h>
32 #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>
43 #include "vport-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;
53 u32 exts; /* VXLAN_F_* in <net/vxlan.h> */
56 static struct vport_ops ovs_vxlan_vport_ops;
58 static inline struct vxlan_port *vxlan_vport(const struct vport *vport)
60 return vport_priv(vport);
63 /* Called with rcu_read_lock and BH disabled. */
64 static void vxlan_rcv(struct vxlan_sock *vs, struct sk_buff *skb,
65 struct vxlan_metadata *md)
67 struct ovs_tunnel_info tun_info;
68 struct vxlan_port *vxlan_port;
69 struct vport *vport = vs->data;
71 struct ovs_vxlan_opts opts = {
78 vxlan_port = vxlan_vport(vport);
79 if (vxlan_port->exts & VXLAN_F_GBP)
80 flags |= TUNNEL_VXLAN_OPT;
82 /* Save outer tunnel values */
84 key = cpu_to_be64(ntohl(md->vni) >> 8);
85 ovs_flow_tun_info_init(&tun_info, iph,
86 udp_hdr(skb)->source, udp_hdr(skb)->dest,
87 key, flags, &opts, sizeof(opts));
89 ovs_vport_receive(vport, skb, &tun_info);
92 static int vxlan_get_options(const struct vport *vport, struct sk_buff *skb)
94 struct vxlan_port *vxlan_port = vxlan_vport(vport);
95 __be16 dst_port = inet_sk(vxlan_port->vs->sock->sk)->inet_sport;
97 if (nla_put_u16(skb, OVS_TUNNEL_ATTR_DST_PORT, ntohs(dst_port)))
100 if (vxlan_port->exts) {
103 exts = nla_nest_start(skb, OVS_TUNNEL_ATTR_EXTENSION);
107 if (vxlan_port->exts & VXLAN_F_GBP &&
108 nla_put_flag(skb, OVS_VXLAN_EXT_GBP))
111 nla_nest_end(skb, exts);
117 static void vxlan_tnl_destroy(struct vport *vport)
119 struct vxlan_port *vxlan_port = vxlan_vport(vport);
121 vxlan_sock_release(vxlan_port->vs);
123 ovs_vport_deferred_free(vport);
126 static const struct nla_policy exts_policy[OVS_VXLAN_EXT_MAX+1] = {
127 [OVS_VXLAN_EXT_GBP] = { .type = NLA_FLAG, },
130 static int vxlan_configure_exts(struct vport *vport, struct nlattr *attr)
132 struct nlattr *exts[OVS_VXLAN_EXT_MAX+1];
133 struct vxlan_port *vxlan_port;
136 if (nla_len(attr) < sizeof(struct nlattr))
139 err = nla_parse_nested(exts, OVS_VXLAN_EXT_MAX, attr, exts_policy);
143 vxlan_port = vxlan_vport(vport);
145 if (exts[OVS_VXLAN_EXT_GBP])
146 vxlan_port->exts |= VXLAN_F_GBP;
151 static struct vport *vxlan_tnl_create(const struct vport_parms *parms)
153 struct net *net = ovs_dp_get_net(parms->dp);
154 struct nlattr *options = parms->options;
155 struct vxlan_port *vxlan_port;
156 struct vxlan_sock *vs;
166 a = nla_find_nested(options, OVS_TUNNEL_ATTR_DST_PORT);
167 if (a && nla_len(a) == sizeof(u16)) {
168 dst_port = nla_get_u16(a);
170 /* Require destination port from userspace. */
175 vport = ovs_vport_alloc(sizeof(struct vxlan_port),
176 &ovs_vxlan_vport_ops, parms);
180 vxlan_port = vxlan_vport(vport);
181 strncpy(vxlan_port->name, parms->name, IFNAMSIZ);
183 a = nla_find_nested(options, OVS_TUNNEL_ATTR_EXTENSION);
185 err = vxlan_configure_exts(vport, a);
187 ovs_vport_free(vport);
192 vs = vxlan_sock_add(net, htons(dst_port), vxlan_rcv, vport, true,
195 ovs_vport_free(vport);
206 static int vxlan_ext_gbp(struct sk_buff *skb)
208 const struct ovs_tunnel_info *tun_info;
209 const struct ovs_vxlan_opts *opts;
211 tun_info = OVS_CB(skb)->egress_tun_info;
212 opts = tun_info->options;
214 if (tun_info->tunnel.tun_flags & TUNNEL_VXLAN_OPT &&
215 tun_info->options_len >= sizeof(*opts))
221 static int vxlan_tnl_send(struct vport *vport, struct sk_buff *skb)
223 struct net *net = ovs_dp_get_net(vport->dp);
224 struct vxlan_port *vxlan_port = vxlan_vport(vport);
225 __be16 dst_port = inet_sk(vxlan_port->vs->sock->sk)->inet_sport;
226 const struct ovs_key_ipv4_tunnel *tun_key;
227 struct vxlan_metadata md = {0};
234 if (unlikely(!OVS_CB(skb)->egress_tun_info)) {
239 tun_key = &OVS_CB(skb)->egress_tun_info->tunnel;
240 rt = ovs_tunnel_route_lookup(net, tun_key, skb->mark, &fl, IPPROTO_UDP);
246 df = tun_key->tun_flags & TUNNEL_DONT_FRAGMENT ?
251 src_port = udp_flow_src_port(net, skb, 0, 0, true);
252 md.vni = htonl(be64_to_cpu(tun_key->tun_id) << 8);
253 md.gbp = vxlan_ext_gbp(skb);
255 err = vxlan_xmit_skb(rt, skb, fl.saddr, tun_key->ipv4_dst,
256 tun_key->ipv4_tos, tun_key->ipv4_ttl, df,
258 &md, false, vxlan_port->exts);
267 static int vxlan_get_egress_tun_info(struct vport *vport, struct sk_buff *skb,
268 struct ovs_tunnel_info *egress_tun_info)
270 struct net *net = ovs_dp_get_net(vport->dp);
271 struct vxlan_port *vxlan_port = vxlan_vport(vport);
272 __be16 dst_port = inet_sk(vxlan_port->vs->sock->sk)->inet_sport;
277 inet_get_local_port_range(net, &port_min, &port_max);
278 src_port = udp_flow_src_port(net, skb, 0, 0, true);
280 return ovs_tunnel_get_egress_info(egress_tun_info, net,
281 OVS_CB(skb)->egress_tun_info,
282 IPPROTO_UDP, skb->mark,
286 static const char *vxlan_get_name(const struct vport *vport)
288 struct vxlan_port *vxlan_port = vxlan_vport(vport);
289 return vxlan_port->name;
292 static struct vport_ops ovs_vxlan_vport_ops = {
293 .type = OVS_VPORT_TYPE_VXLAN,
294 .create = vxlan_tnl_create,
295 .destroy = vxlan_tnl_destroy,
296 .get_name = vxlan_get_name,
297 .get_options = vxlan_get_options,
298 .send = vxlan_tnl_send,
299 .get_egress_tun_info = vxlan_get_egress_tun_info,
300 .owner = THIS_MODULE,
303 static int __init ovs_vxlan_tnl_init(void)
305 return ovs_vport_ops_register(&ovs_vxlan_vport_ops);
308 static void __exit ovs_vxlan_tnl_exit(void)
310 ovs_vport_ops_unregister(&ovs_vxlan_vport_ops);
313 module_init(ovs_vxlan_tnl_init);
314 module_exit(ovs_vxlan_tnl_exit);
316 MODULE_DESCRIPTION("OVS: VXLAN switching port");
317 MODULE_LICENSE("GPL");
318 MODULE_ALIAS("vport-type-4");