forked from Minki/linux
1d8fff9073
Rename the tunnel metadata data structures currently internal to OVS and make them generic for use by all IP tunnels. Both structures are kernel internal and will stay that way. Their members are exposed to user space through individual Netlink attributes by OVS. It will therefore be possible to extend/modify these structures without affecting user ABI. Signed-off-by: Thomas Graf <tgraf@suug.ch> Signed-off-by: David S. Miller <davem@davemloft.net>
323 lines
7.8 KiB
C
323 lines
7.8 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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#include "vport-vxlan.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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u32 exts; /* VXLAN_F_* in <net/vxlan.h> */
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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,
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struct vxlan_metadata *md)
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{
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struct ip_tunnel_info tun_info;
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struct vxlan_port *vxlan_port;
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struct vport *vport = vs->data;
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struct iphdr *iph;
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struct ovs_vxlan_opts opts = {
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.gbp = md->gbp,
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};
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__be64 key;
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__be16 flags;
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flags = TUNNEL_KEY | (udp_hdr(skb)->check != 0 ? TUNNEL_CSUM : 0);
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vxlan_port = vxlan_vport(vport);
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if (vxlan_port->exts & VXLAN_F_GBP && md->gbp)
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flags |= TUNNEL_VXLAN_OPT;
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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(md->vni) >> 8);
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ip_tunnel_info_init(&tun_info, iph,
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udp_hdr(skb)->source, udp_hdr(skb)->dest,
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key, flags, &opts, sizeof(opts));
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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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if (vxlan_port->exts) {
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struct nlattr *exts;
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exts = nla_nest_start(skb, OVS_TUNNEL_ATTR_EXTENSION);
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if (!exts)
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return -EMSGSIZE;
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if (vxlan_port->exts & VXLAN_F_GBP &&
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nla_put_flag(skb, OVS_VXLAN_EXT_GBP))
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return -EMSGSIZE;
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nla_nest_end(skb, exts);
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}
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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 const struct nla_policy exts_policy[OVS_VXLAN_EXT_MAX+1] = {
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[OVS_VXLAN_EXT_GBP] = { .type = NLA_FLAG, },
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};
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static int vxlan_configure_exts(struct vport *vport, struct nlattr *attr)
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{
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struct nlattr *exts[OVS_VXLAN_EXT_MAX+1];
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struct vxlan_port *vxlan_port;
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int err;
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if (nla_len(attr) < sizeof(struct nlattr))
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return -EINVAL;
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err = nla_parse_nested(exts, OVS_VXLAN_EXT_MAX, attr, exts_policy);
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if (err < 0)
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return err;
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vxlan_port = vxlan_vport(vport);
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if (exts[OVS_VXLAN_EXT_GBP])
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vxlan_port->exts |= VXLAN_F_GBP;
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return 0;
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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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a = nla_find_nested(options, OVS_TUNNEL_ATTR_EXTENSION);
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if (a) {
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err = vxlan_configure_exts(vport, a);
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if (err) {
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ovs_vport_free(vport);
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goto error;
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}
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}
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vs = vxlan_sock_add(net, htons(dst_port), vxlan_rcv, vport, true,
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vxlan_port->exts);
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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_ext_gbp(struct sk_buff *skb)
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{
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const struct ip_tunnel_info *tun_info;
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const struct ovs_vxlan_opts *opts;
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tun_info = OVS_CB(skb)->egress_tun_info;
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opts = tun_info->options;
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if (tun_info->key.tun_flags & TUNNEL_VXLAN_OPT &&
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tun_info->options_len >= sizeof(*opts))
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return opts->gbp;
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else
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return 0;
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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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struct sock *sk = vxlan_port->vs->sock->sk;
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__be16 dst_port = inet_sk(sk)->inet_sport;
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const struct ip_tunnel_key *tun_key;
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struct vxlan_metadata md = {0};
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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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u32 vxflags;
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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->key;
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rt = ovs_tunnel_route_lookup(net, tun_key, skb->mark, &fl, IPPROTO_UDP);
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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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md.vni = htonl(be64_to_cpu(tun_key->tun_id) << 8);
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md.gbp = vxlan_ext_gbp(skb);
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vxflags = vxlan_port->exts |
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(tun_key->tun_flags & TUNNEL_CSUM ? VXLAN_F_UDP_CSUM : 0);
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err = vxlan_xmit_skb(rt, sk, skb, 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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&md, false, vxflags);
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if (err < 0)
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ip_rt_put(rt);
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return err;
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error:
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kfree_skb(skb);
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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 ip_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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