2013-08-19 12:23:34 -06:00
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/*
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* Copyright (c) 2013 Nicira, Inc.
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* Copyright (c) 2013 Cisco Systems, Inc.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of version 2 of the GNU General Public
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* License as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301, USA
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/in.h>
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#include <linux/ip.h>
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#include <linux/net.h>
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#include <linux/rculist.h>
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#include <linux/udp.h>
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#include <net/icmp.h>
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#include <net/ip.h>
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#include <net/udp.h>
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#include <net/ip_tunnels.h>
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#include <net/rtnetlink.h>
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#include <net/route.h>
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#include <net/dsfield.h>
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#include <net/inet_ecn.h>
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#include <net/net_namespace.h>
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#include <net/netns/generic.h>
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#include <net/vxlan.h>
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#include "datapath.h"
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#include "vport.h"
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/**
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* struct vxlan_port - Keeps track of open UDP ports
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* @vs: vxlan_sock created for the port.
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* @name: vport name.
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*/
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struct vxlan_port {
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struct vxlan_sock *vs;
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char name[IFNAMSIZ];
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};
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static inline struct vxlan_port *vxlan_vport(const struct vport *vport)
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{
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return vport_priv(vport);
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}
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/* Called with rcu_read_lock and BH disabled. */
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static void vxlan_rcv(struct vxlan_sock *vs, struct sk_buff *skb, __be32 vx_vni)
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{
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struct ovs_key_ipv4_tunnel tun_key;
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struct vport *vport = vs->data;
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struct iphdr *iph;
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__be64 key;
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/* Save outer tunnel values */
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iph = ip_hdr(skb);
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key = cpu_to_be64(ntohl(vx_vni) >> 8);
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ovs_flow_tun_key_init(&tun_key, iph, key, TUNNEL_KEY);
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ovs_vport_receive(vport, skb, &tun_key);
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}
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static int vxlan_get_options(const struct vport *vport, struct sk_buff *skb)
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{
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struct vxlan_port *vxlan_port = vxlan_vport(vport);
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__be16 dst_port = inet_sk(vxlan_port->vs->sock->sk)->inet_sport;
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if (nla_put_u16(skb, OVS_TUNNEL_ATTR_DST_PORT, ntohs(dst_port)))
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return -EMSGSIZE;
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return 0;
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}
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static void vxlan_tnl_destroy(struct vport *vport)
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{
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struct vxlan_port *vxlan_port = vxlan_vport(vport);
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vxlan_sock_release(vxlan_port->vs);
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ovs_vport_deferred_free(vport);
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}
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static struct vport *vxlan_tnl_create(const struct vport_parms *parms)
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{
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struct net *net = ovs_dp_get_net(parms->dp);
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struct nlattr *options = parms->options;
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struct vxlan_port *vxlan_port;
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struct vxlan_sock *vs;
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struct vport *vport;
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struct nlattr *a;
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u16 dst_port;
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int err;
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if (!options) {
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err = -EINVAL;
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goto error;
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}
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a = nla_find_nested(options, OVS_TUNNEL_ATTR_DST_PORT);
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if (a && nla_len(a) == sizeof(u16)) {
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dst_port = nla_get_u16(a);
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} else {
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/* Require destination port from userspace. */
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err = -EINVAL;
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goto error;
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}
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vport = ovs_vport_alloc(sizeof(struct vxlan_port),
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&ovs_vxlan_vport_ops, parms);
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if (IS_ERR(vport))
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return vport;
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vxlan_port = vxlan_vport(vport);
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strncpy(vxlan_port->name, parms->name, IFNAMSIZ);
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2014-06-04 18:20:29 -06:00
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vs = vxlan_sock_add(net, htons(dst_port), vxlan_rcv, vport, true, 0);
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2013-08-19 12:23:34 -06:00
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if (IS_ERR(vs)) {
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ovs_vport_free(vport);
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return (void *)vs;
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}
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vxlan_port->vs = vs;
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return vport;
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error:
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return ERR_PTR(err);
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}
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static int vxlan_tnl_send(struct vport *vport, struct sk_buff *skb)
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{
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struct net *net = ovs_dp_get_net(vport->dp);
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struct vxlan_port *vxlan_port = vxlan_vport(vport);
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__be16 dst_port = inet_sk(vxlan_port->vs->sock->sk)->inet_sport;
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struct rtable *rt;
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struct flowi4 fl;
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__be16 src_port;
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int port_min;
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int port_max;
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__be16 df;
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int err;
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if (unlikely(!OVS_CB(skb)->tun_key)) {
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err = -EINVAL;
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goto error;
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}
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/* Route lookup */
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memset(&fl, 0, sizeof(fl));
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fl.daddr = OVS_CB(skb)->tun_key->ipv4_dst;
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fl.saddr = OVS_CB(skb)->tun_key->ipv4_src;
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fl.flowi4_tos = RT_TOS(OVS_CB(skb)->tun_key->ipv4_tos);
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fl.flowi4_mark = skb->mark;
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fl.flowi4_proto = IPPROTO_UDP;
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rt = ip_route_output_key(net, &fl);
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if (IS_ERR(rt)) {
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err = PTR_ERR(rt);
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goto error;
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}
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df = OVS_CB(skb)->tun_key->tun_flags & TUNNEL_DONT_FRAGMENT ?
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htons(IP_DF) : 0;
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2014-05-04 17:39:18 -06:00
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skb->ignore_df = 1;
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2013-08-19 12:23:34 -06:00
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2013-09-28 15:10:59 -06:00
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inet_get_local_port_range(net, &port_min, &port_max);
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2013-08-19 12:23:34 -06:00
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src_port = vxlan_src_port(port_min, port_max, skb);
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2013-09-02 07:34:55 -06:00
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err = vxlan_xmit_skb(vxlan_port->vs, rt, skb,
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2013-08-19 12:23:34 -06:00
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fl.saddr, OVS_CB(skb)->tun_key->ipv4_dst,
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OVS_CB(skb)->tun_key->ipv4_tos,
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OVS_CB(skb)->tun_key->ipv4_ttl, df,
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src_port, dst_port,
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2014-04-24 02:02:49 -06:00
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htonl(be64_to_cpu(OVS_CB(skb)->tun_key->tun_id) << 8),
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false);
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2013-08-19 12:23:34 -06:00
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if (err < 0)
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ip_rt_put(rt);
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error:
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return err;
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}
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static const char *vxlan_get_name(const struct vport *vport)
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{
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struct vxlan_port *vxlan_port = vxlan_vport(vport);
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return vxlan_port->name;
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}
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const struct vport_ops ovs_vxlan_vport_ops = {
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.type = OVS_VPORT_TYPE_VXLAN,
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.create = vxlan_tnl_create,
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.destroy = vxlan_tnl_destroy,
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.get_name = vxlan_get_name,
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.get_options = vxlan_get_options,
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.send = vxlan_tnl_send,
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};
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