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>
29 #include <linux/module.h>
34 #include <net/ip_tunnels.h>
35 #include <net/rtnetlink.h>
36 #include <net/route.h>
37 #include <net/dsfield.h>
38 #include <net/inet_ecn.h>
39 #include <net/net_namespace.h>
40 #include <net/netns/generic.h>
41 #include <net/vxlan.h>
45 #include "vport-vxlan.h"
48 * struct vxlan_port - Keeps track of open UDP ports
49 * @vs: vxlan_sock created for the port.
53 struct vxlan_sock *vs;
55 u32 exts; /* VXLAN_F_* in <net/vxlan.h> */
58 static struct vport_ops ovs_vxlan_vport_ops;
60 static inline struct vxlan_port *vxlan_vport(const struct vport *vport)
62 return vport_priv(vport);
65 static void vxlan_rcv(struct vxlan_sock *vs, struct sk_buff *skb,
66 struct vxlan_metadata *md)
68 struct ovs_tunnel_info tun_info;
69 struct vxlan_port *vxlan_port;
70 struct vport *vport = vs->data;
72 struct ovs_vxlan_opts opts = {
78 flags = TUNNEL_KEY | (udp_hdr(skb)->check != 0 ? TUNNEL_CSUM : 0);
79 vxlan_port = vxlan_vport(vport);
80 if (vxlan_port->exts & VXLAN_F_GBP && md->gbp)
81 flags |= TUNNEL_VXLAN_OPT;
83 /* Save outer tunnel values */
85 key = cpu_to_be64(ntohl(md->vni) >> 8);
86 ovs_flow_tun_info_init(&tun_info, iph,
87 udp_hdr(skb)->source, udp_hdr(skb)->dest,
88 key, flags, &opts, sizeof(opts));
90 ovs_vport_receive(vport, skb, &tun_info);
93 static int vxlan_get_options(const struct vport *vport, struct sk_buff *skb)
95 struct vxlan_port *vxlan_port = vxlan_vport(vport);
96 __be16 dst_port = inet_sport(vxlan_port->vs->sock->sk);
98 if (nla_put_u16(skb, OVS_TUNNEL_ATTR_DST_PORT, ntohs(dst_port)))
101 if (vxlan_port->exts) {
104 exts = nla_nest_start(skb, OVS_TUNNEL_ATTR_EXTENSION);
108 if (vxlan_port->exts & VXLAN_F_GBP &&
109 nla_put_flag(skb, OVS_VXLAN_EXT_GBP))
112 nla_nest_end(skb, exts);
118 static void vxlan_tnl_destroy(struct vport *vport)
120 struct vxlan_port *vxlan_port = vxlan_vport(vport);
122 vxlan_sock_release(vxlan_port->vs);
124 ovs_vport_deferred_free(vport);
127 static const struct nla_policy exts_policy[OVS_VXLAN_EXT_MAX+1] = {
128 [OVS_VXLAN_EXT_GBP] = { .type = NLA_FLAG, },
131 static int vxlan_configure_exts(struct vport *vport, struct nlattr *attr)
133 struct nlattr *exts[OVS_VXLAN_EXT_MAX+1];
134 struct vxlan_port *vxlan_port;
137 if (nla_len(attr) < sizeof(struct nlattr))
140 err = nla_parse_nested(exts, OVS_VXLAN_EXT_MAX, attr, exts_policy);
144 vxlan_port = vxlan_vport(vport);
146 if (exts[OVS_VXLAN_EXT_GBP])
147 vxlan_port->exts |= VXLAN_F_GBP;
152 static struct vport *vxlan_tnl_create(const struct vport_parms *parms)
154 struct net *net = ovs_dp_get_net(parms->dp);
155 struct nlattr *options = parms->options;
156 struct vxlan_port *vxlan_port;
157 struct vxlan_sock *vs;
167 a = nla_find_nested(options, OVS_TUNNEL_ATTR_DST_PORT);
168 if (a && nla_len(a) == sizeof(u16)) {
169 dst_port = nla_get_u16(a);
171 /* Require destination port from userspace. */
176 vport = ovs_vport_alloc(sizeof(struct vxlan_port),
177 &ovs_vxlan_vport_ops, parms);
181 vxlan_port = vxlan_vport(vport);
182 strncpy(vxlan_port->name, parms->name, IFNAMSIZ);
184 a = nla_find_nested(options, OVS_TUNNEL_ATTR_EXTENSION);
186 err = vxlan_configure_exts(vport, a);
188 ovs_vport_free(vport);
193 vs = vxlan_sock_add(net, htons(dst_port), vxlan_rcv, vport, true,
196 ovs_vport_free(vport);
207 static int vxlan_ext_gbp(struct sk_buff *skb)
209 const struct ovs_tunnel_info *tun_info;
210 const struct ovs_vxlan_opts *opts;
212 tun_info = OVS_CB(skb)->egress_tun_info;
213 opts = tun_info->options;
215 if (tun_info->tunnel.tun_flags & TUNNEL_VXLAN_OPT &&
216 tun_info->options_len >= sizeof(*opts))
222 static int vxlan_tnl_send(struct vport *vport, struct sk_buff *skb)
224 struct ovs_key_ipv4_tunnel *tun_key;
225 struct net *net = ovs_dp_get_net(vport->dp);
226 struct vxlan_port *vxlan_port = vxlan_vport(vport);
227 __be16 dst_port = inet_sport(vxlan_port->vs->sock->sk);
228 struct vxlan_metadata md = {0};
236 if (unlikely(!OVS_CB(skb)->egress_tun_info)) {
241 tun_key = &OVS_CB(skb)->egress_tun_info->tunnel;
244 saddr = tun_key->ipv4_src;
245 rt = find_route(ovs_dp_get_net(vport->dp),
246 &saddr, tun_key->ipv4_dst,
247 IPPROTO_UDP, tun_key->ipv4_tos,
254 df = tun_key->tun_flags & TUNNEL_DONT_FRAGMENT ? htons(IP_DF) : 0;
257 src_port = udp_flow_src_port(net, skb, 0, 0, true);
258 md.vni = htonl(be64_to_cpu(tun_key->tun_id) << 8);
259 md.gbp = vxlan_ext_gbp(skb);
260 vxflags = vxlan_port->exts |
261 (tun_key->tun_flags & TUNNEL_CSUM ? VXLAN_F_UDP_CSUM : 0);
263 err = vxlan_xmit_skb(rt, vxlan_port->vs->sock->sk, skb,
264 saddr, tun_key->ipv4_dst,
266 tun_key->ipv4_ttl, df,
268 &md, false, vxflags);
277 static int vxlan_get_egress_tun_info(struct vport *vport, struct sk_buff *skb,
278 struct ovs_tunnel_info *egress_tun_info)
280 struct net *net = ovs_dp_get_net(vport->dp);
281 struct vxlan_port *vxlan_port = vxlan_vport(vport);
282 __be16 dst_port = inet_sport(vxlan_port->vs->sock->sk);
285 src_port = udp_flow_src_port(net, skb, 0, 0, true);
287 return ovs_tunnel_get_egress_info(egress_tun_info, net,
288 OVS_CB(skb)->egress_tun_info,
289 IPPROTO_UDP, skb->mark,
293 static const char *vxlan_get_name(const struct vport *vport)
295 struct vxlan_port *vxlan_port = vxlan_vport(vport);
296 return vxlan_port->name;
299 static struct vport_ops ovs_vxlan_vport_ops = {
300 .type = OVS_VPORT_TYPE_VXLAN,
301 .create = vxlan_tnl_create,
302 .destroy = vxlan_tnl_destroy,
303 .get_name = vxlan_get_name,
304 .get_options = vxlan_get_options,
305 .send = vxlan_tnl_send,
306 .get_egress_tun_info = vxlan_get_egress_tun_info,
307 .owner = THIS_MODULE,
310 static int __init ovs_vxlan_tnl_init(void)
312 return ovs_vport_ops_register(&ovs_vxlan_vport_ops);
315 static void __exit ovs_vxlan_tnl_exit(void)
317 ovs_vport_ops_unregister(&ovs_vxlan_vport_ops);
320 module_init(ovs_vxlan_tnl_init);
321 module_exit(ovs_vxlan_tnl_exit);
323 MODULE_DESCRIPTION("OVS: VXLAN switching port");
324 MODULE_LICENSE("GPL");
325 MODULE_ALIAS("vport-type-4");