forked from Minki/linux
f01ec1c017
This patch allows to switch the netns when packet is encapsulated or decapsulated. The vxlan socket is openned into the i/o netns, ie into the netns where encapsulated packets are received. The socket lookup is done into this netns to find the corresponding vxlan tunnel. After decapsulation, the packet is injecting into the corresponding interface which may stand to another netns. When one of the two netns is removed, the tunnel is destroyed. Configuration example: ip netns add netns1 ip netns exec netns1 ip link set lo up ip link add vxlan10 type vxlan id 10 group 239.0.0.10 dev eth0 dstport 0 ip link set vxlan10 netns netns1 ip netns exec netns1 ip addr add 192.168.0.249/24 broadcast 192.168.0.255 dev vxlan10 ip netns exec netns1 ip link set vxlan10 up Signed-off-by: Nicolas Dichtel <nicolas.dichtel@6wind.com> Signed-off-by: David S. Miller <davem@davemloft.net>
205 lines
5.0 KiB
C
205 lines
5.0 KiB
C
/*
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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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vs = vxlan_sock_add(net, htons(dst_port), vxlan_rcv, vport, true, false);
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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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skb->local_df = 1;
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inet_get_local_port_range(net, &port_min, &port_max);
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src_port = vxlan_src_port(port_min, port_max, skb);
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err = vxlan_xmit_skb(vxlan_port->vs, rt, skb,
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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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htonl(be64_to_cpu(OVS_CB(skb)->tun_key->tun_id) << 8),
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false);
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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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