2 * Copyright (c) 2014 Nicira, Inc.
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version
7 * 2 of the License, or (at your option) any later version.
10 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
14 #include <linux/net.h>
15 #include <linux/rculist.h>
16 #include <linux/udp.h>
17 #include <linux/if_vlan.h>
18 #include <linux/module.h>
20 #include <net/geneve.h>
23 #include <net/route.h>
30 static struct vport_ops ovs_geneve_vport_ops;
33 * struct geneve_port - Keeps track of open UDP ports
34 * @gs: The socket created for this port number.
38 struct geneve_sock *gs;
42 static LIST_HEAD(geneve_ports);
44 static inline struct geneve_port *geneve_vport(const struct vport *vport)
46 return vport_priv(vport);
49 /* Convert 64 bit tunnel ID to 24 bit VNI. */
50 static void tunnel_id_to_vni(__be64 tun_id, __u8 *vni)
53 vni[0] = (__force __u8)(tun_id >> 16);
54 vni[1] = (__force __u8)(tun_id >> 8);
55 vni[2] = (__force __u8)tun_id;
57 vni[0] = (__force __u8)((__force u64)tun_id >> 40);
58 vni[1] = (__force __u8)((__force u64)tun_id >> 48);
59 vni[2] = (__force __u8)((__force u64)tun_id >> 56);
63 /* Convert 24 bit VNI to 64 bit tunnel ID. */
64 static __be64 vni_to_tunnel_id(const __u8 *vni)
67 return (vni[0] << 16) | (vni[1] << 8) | vni[2];
69 return (__force __be64)(((__force u64)vni[0] << 40) |
70 ((__force u64)vni[1] << 48) |
71 ((__force u64)vni[2] << 56));
75 static void geneve_rcv(struct geneve_sock *gs, struct sk_buff *skb)
77 struct vport *vport = gs->rcv_data;
78 struct genevehdr *geneveh = geneve_hdr(skb);
80 struct ip_tunnel_info tun_info;
84 opts_len = geneveh->opt_len * 4;
86 flags = TUNNEL_KEY | TUNNEL_GENEVE_OPT |
87 (udp_hdr(skb)->check != 0 ? TUNNEL_CSUM : 0) |
88 (geneveh->oam ? TUNNEL_OAM : 0) |
89 (geneveh->critical ? TUNNEL_CRIT_OPT : 0);
91 key = vni_to_tunnel_id(geneveh->vni);
93 ip_tunnel_info_init(&tun_info, ip_hdr(skb),
94 udp_hdr(skb)->source, udp_hdr(skb)->dest,
95 key, flags, geneveh->options, opts_len);
97 ovs_vport_receive(vport, skb, &tun_info);
100 static int geneve_get_options(const struct vport *vport,
103 struct geneve_port *geneve_port = geneve_vport(vport);
104 struct inet_sock *sk = inet_sk(geneve_port->gs->sock->sk);
106 if (nla_put_u16(skb, OVS_TUNNEL_ATTR_DST_PORT, ntohs(sk->inet_sport)))
111 static void geneve_tnl_destroy(struct vport *vport)
113 struct geneve_port *geneve_port = geneve_vport(vport);
115 geneve_sock_release(geneve_port->gs);
117 ovs_vport_deferred_free(vport);
120 static struct vport *geneve_tnl_create(const struct vport_parms *parms)
122 struct net *net = ovs_dp_get_net(parms->dp);
123 struct nlattr *options = parms->options;
124 struct geneve_port *geneve_port;
125 struct geneve_sock *gs;
136 a = nla_find_nested(options, OVS_TUNNEL_ATTR_DST_PORT);
137 if (a && nla_len(a) == sizeof(u16)) {
138 dst_port = nla_get_u16(a);
140 /* Require destination port from userspace. */
145 vport = ovs_vport_alloc(sizeof(struct geneve_port),
146 &ovs_geneve_vport_ops, parms);
150 geneve_port = geneve_vport(vport);
151 strncpy(geneve_port->name, parms->name, IFNAMSIZ);
153 gs = geneve_sock_add(net, htons(dst_port), geneve_rcv, vport, true, 0);
155 ovs_vport_free(vport);
158 geneve_port->gs = gs;
165 static int geneve_tnl_send(struct vport *vport, struct sk_buff *skb)
167 const struct ip_tunnel_key *tun_key;
168 struct ip_tunnel_info *tun_info;
169 struct net *net = ovs_dp_get_net(vport->dp);
170 struct geneve_port *geneve_port = geneve_vport(vport);
171 __be16 dport = inet_sk(geneve_port->gs->sock->sk)->inet_sport;
175 u8 vni[3], opts_len, *opts;
179 tun_info = OVS_CB(skb)->egress_tun_info;
180 if (unlikely(!tun_info)) {
185 tun_key = &tun_info->key;
186 rt = ovs_tunnel_route_lookup(net, tun_key, skb->mark, &fl, IPPROTO_UDP);
192 df = tun_key->tun_flags & TUNNEL_DONT_FRAGMENT ? htons(IP_DF) : 0;
193 sport = udp_flow_src_port(net, skb, 1, USHRT_MAX, true);
194 tunnel_id_to_vni(tun_key->tun_id, vni);
197 if (tun_key->tun_flags & TUNNEL_GENEVE_OPT) {
198 opts = (u8 *)tun_info->options;
199 opts_len = tun_info->options_len;
205 err = geneve_xmit_skb(geneve_port->gs, rt, skb, fl.saddr,
206 tun_key->u.ipv4.dst, tun_key->tos,
207 tun_key->ttl, df, sport, dport,
208 tun_key->tun_flags, vni, opts_len, opts,
209 !!(tun_key->tun_flags & TUNNEL_CSUM), false);
219 static const char *geneve_get_name(const struct vport *vport)
221 struct geneve_port *geneve_port = geneve_vport(vport);
223 return geneve_port->name;
226 static int geneve_get_egress_tun_info(struct vport *vport, struct sk_buff *skb,
227 struct ip_tunnel_info *egress_tun_info)
229 struct geneve_port *geneve_port = geneve_vport(vport);
230 struct net *net = ovs_dp_get_net(vport->dp);
231 __be16 dport = inet_sk(geneve_port->gs->sock->sk)->inet_sport;
232 __be16 sport = udp_flow_src_port(net, skb, 1, USHRT_MAX, true);
234 /* Get tp_src and tp_dst, refert to geneve_build_header().
236 return ovs_tunnel_get_egress_info(egress_tun_info,
237 ovs_dp_get_net(vport->dp),
238 OVS_CB(skb)->egress_tun_info,
239 IPPROTO_UDP, skb->mark, sport, dport);
242 static struct vport_ops ovs_geneve_vport_ops = {
243 .type = OVS_VPORT_TYPE_GENEVE,
244 .create = geneve_tnl_create,
245 .destroy = geneve_tnl_destroy,
246 .get_name = geneve_get_name,
247 .get_options = geneve_get_options,
248 .send = geneve_tnl_send,
249 .owner = THIS_MODULE,
250 .get_egress_tun_info = geneve_get_egress_tun_info,
253 static int __init ovs_geneve_tnl_init(void)
255 return ovs_vport_ops_register(&ovs_geneve_vport_ops);
258 static void __exit ovs_geneve_tnl_exit(void)
260 ovs_vport_ops_unregister(&ovs_geneve_vport_ops);
263 module_init(ovs_geneve_tnl_init);
264 module_exit(ovs_geneve_tnl_exit);
266 MODULE_DESCRIPTION("OVS: Geneve swiching port");
267 MODULE_LICENSE("GPL");
268 MODULE_ALIAS("vport-type-5");