![Wenyu Zhang](/assets/img/avatar_default.png)
OVS vswitch has extended IPFIX exporter to export tunnel headers to improve network visibility. To export this information userspace needs to know egress tunnel for given packet. By extending packet attributes datapath can export egress tunnel info for given packet. So that userspace can ask for egress tunnel info in userspace action. This information is used to build IPFIX data for given flow. Signed-off-by: Wenyu Zhang <wenyuz@vmware.com> Acked-by: Romain Lenglet <rlenglet@vmware.com> Acked-by: Ben Pfaff <blp@nicira.com> Signed-off-by: Pravin B Shelar <pshelar@nicira.com>
246 lines
6.1 KiB
C
246 lines
6.1 KiB
C
/*
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* Copyright (c) 2014 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 <linux/module.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 struct vport_ops ovs_vxlan_vport_ops;
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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_tunnel_info tun_info;
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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_info_init(&tun_info, iph,
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udp_hdr(skb)->source, udp_hdr(skb)->dest,
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key, TUNNEL_KEY, NULL, 0);
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ovs_vport_receive(vport, skb, &tun_info);
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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, 0);
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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 ovs_key_ipv4_tunnel *tun_key;
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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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__be16 df;
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int err;
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if (unlikely(!OVS_CB(skb)->egress_tun_info)) {
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err = -EINVAL;
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goto error;
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}
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tun_key = &OVS_CB(skb)->egress_tun_info->tunnel;
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/* Route lookup */
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memset(&fl, 0, sizeof(fl));
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fl.daddr = tun_key->ipv4_dst;
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fl.saddr = tun_key->ipv4_src;
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fl.flowi4_tos = RT_TOS(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 = tun_key->tun_flags & TUNNEL_DONT_FRAGMENT ?
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htons(IP_DF) : 0;
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skb->ignore_df = 1;
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src_port = udp_flow_src_port(net, skb, 0, 0, true);
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err = vxlan_xmit_skb(vxlan_port->vs, rt, skb,
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fl.saddr, tun_key->ipv4_dst,
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tun_key->ipv4_tos, tun_key->ipv4_ttl, df,
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src_port, dst_port,
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htonl(be64_to_cpu(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 int vxlan_get_egress_tun_info(struct vport *vport, struct sk_buff *skb,
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struct ovs_tunnel_info *egress_tun_info)
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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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__be16 src_port;
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int port_min;
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int port_max;
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inet_get_local_port_range(net, &port_min, &port_max);
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src_port = udp_flow_src_port(net, skb, 0, 0, true);
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return ovs_tunnel_get_egress_info(egress_tun_info, net,
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OVS_CB(skb)->egress_tun_info,
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IPPROTO_UDP, skb->mark,
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src_port, dst_port);
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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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static 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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.get_egress_tun_info = vxlan_get_egress_tun_info,
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.owner = THIS_MODULE,
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};
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static int __init ovs_vxlan_tnl_init(void)
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{
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return ovs_vport_ops_register(&ovs_vxlan_vport_ops);
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}
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static void __exit ovs_vxlan_tnl_exit(void)
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{
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ovs_vport_ops_unregister(&ovs_vxlan_vport_ops);
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}
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module_init(ovs_vxlan_tnl_init);
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module_exit(ovs_vxlan_tnl_exit);
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MODULE_DESCRIPTION("OVS: VXLAN switching port");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("vport-type-4");
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