net/openvswitch/vport-gre.c - kernel/msm-4.9 - Gitiles

 /*
  * Copyright (c) 2007-2013 Nicira, Inc.
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of version 2 of the GNU General Public
  * License as published by the Free Software Foundation.
  *
  * This program is distributed in the hope that it will be useful, but
  * WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  * General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License
  * along with this program; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  * 02110-1301, USA
  */

 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

 #include <linux/if.h>
 #include <linux/skbuff.h>
 #include <linux/ip.h>
 #include <linux/if_tunnel.h>
 #include <linux/if_vlan.h>
 #include <linux/in.h>
 #include <linux/in_route.h>
 #include <linux/inetdevice.h>
 #include <linux/jhash.h>
 #include <linux/list.h>
 #include <linux/kernel.h>
 #include <linux/workqueue.h>
 #include <linux/rculist.h>
 #include <net/route.h>
 #include <net/xfrm.h>

 #include <net/icmp.h>
 #include <net/ip.h>
 #include <net/ip_tunnels.h>
 #include <net/gre.h>
 #include <net/net_namespace.h>
 #include <net/netns/generic.h>
 #include <net/protocol.h>

 #include "datapath.h"
 #include "vport.h"

 /* Returns the least-significant 32 bits of a __be64. */
 static __be32 be64_get_low32(__be64 x)
 {
 #ifdef __BIG_ENDIAN
 	return (__force __be32)x;
 #else
 	return (__force __be32)((__force u64)x >> 32);
 #endif
 }

 static __be16 filter_tnl_flags(__be16 flags)
 {
 	return flags & (TUNNEL_CSUM | TUNNEL_KEY);
 }

 static struct sk_buff *__build_header(struct sk_buff *skb,
 				      int tunnel_hlen)
 {
 	const struct ovs_key_ipv4_tunnel *tun_key = OVS_CB(skb)->tun_key;
 	struct tnl_ptk_info tpi;

 	skb = gre_handle_offloads(skb, !!(tun_key->tun_flags & TUNNEL_CSUM));
 	if (IS_ERR(skb))
 		return NULL;

 	tpi.flags = filter_tnl_flags(tun_key->tun_flags);
 	tpi.proto = htons(ETH_P_TEB);
 	tpi.key = be64_get_low32(tun_key->tun_id);
 	tpi.seq = 0;
 	gre_build_header(skb, &tpi, tunnel_hlen);

 	return skb;
 }

 static __be64 key_to_tunnel_id(__be32 key, __be32 seq)
 {
 #ifdef __BIG_ENDIAN
 	return (__force __be64)((__force u64)seq << 32 | (__force u32)key);
 #else
 	return (__force __be64)((__force u64)key << 32 | (__force u32)seq);
 #endif
 }

 /* Called with rcu_read_lock and BH disabled. */
 static int gre_rcv(struct sk_buff *skb,
 		   const struct tnl_ptk_info *tpi)
 {
 	struct ovs_key_ipv4_tunnel tun_key;
 	struct ovs_net *ovs_net;
 	struct vport *vport;
 	__be64 key;

 	ovs_net = net_generic(dev_net(skb->dev), ovs_net_id);
 	vport = rcu_dereference(ovs_net->vport_net.gre_vport);
 	if (unlikely(!vport))
 		return PACKET_REJECT;

 	key = key_to_tunnel_id(tpi->key, tpi->seq);
 	ovs_flow_tun_key_init(&tun_key, ip_hdr(skb), key,
 			      filter_tnl_flags(tpi->flags));

 	ovs_vport_receive(vport, skb, &tun_key);
 	return PACKET_RCVD;
 }

 /* Called with rcu_read_lock and BH disabled. */
 static int gre_err(struct sk_buff *skb, u32 info,
 		   const struct tnl_ptk_info *tpi)
 {
 	struct ovs_net *ovs_net;
 	struct vport *vport;

 	ovs_net = net_generic(dev_net(skb->dev), ovs_net_id);
 	vport = rcu_dereference(ovs_net->vport_net.gre_vport);

 	if (unlikely(!vport))
 		return PACKET_REJECT;
 	else
 		return PACKET_RCVD;
 }

 static int gre_tnl_send(struct vport *vport, struct sk_buff *skb)
 {
 	struct net *net = ovs_dp_get_net(vport->dp);
 	struct flowi4 fl;
 	struct rtable *rt;
 	int min_headroom;
 	int tunnel_hlen;
 	__be16 df;
 	int err;

 	if (unlikely(!OVS_CB(skb)->tun_key)) {
 		err = -EINVAL;
 		goto error;
 	}

 	/* Route lookup */
 	memset(&fl, 0, sizeof(fl));
 	fl.daddr = OVS_CB(skb)->tun_key->ipv4_dst;
 	fl.saddr = OVS_CB(skb)->tun_key->ipv4_src;
 	fl.flowi4_tos = RT_TOS(OVS_CB(skb)->tun_key->ipv4_tos);
 	fl.flowi4_mark = skb->mark;
 	fl.flowi4_proto = IPPROTO_GRE;

 	rt = ip_route_output_key(net, &fl);
 	if (IS_ERR(rt))
 		return PTR_ERR(rt);

 	tunnel_hlen = ip_gre_calc_hlen(OVS_CB(skb)->tun_key->tun_flags);

 	min_headroom = LL_RESERVED_SPACE(rt->dst.dev) + rt->dst.header_len
 			+ tunnel_hlen + sizeof(struct iphdr)
 			+ (vlan_tx_tag_present(skb) ? VLAN_HLEN : 0);
 	if (skb_headroom(skb) < min_headroom || skb_header_cloned(skb)) {
 		int head_delta = SKB_DATA_ALIGN(min_headroom -
 						skb_headroom(skb) +
 						16);
 		err = pskb_expand_head(skb, max_t(int, head_delta, 0),
 					0, GFP_ATOMIC);
 		if (unlikely(err))
 			goto err_free_rt;
 	}

 	if (vlan_tx_tag_present(skb)) {
 		if (unlikely(!__vlan_put_tag(skb,
 					     skb->vlan_proto,
 					     vlan_tx_tag_get(skb)))) {
 			err = -ENOMEM;
 			goto err_free_rt;
 		}
 		skb->vlan_tci = 0;
 	}

 	/* Push Tunnel header. */
 	skb = __build_header(skb, tunnel_hlen);
 	if (unlikely(!skb)) {
 		err = 0;
 		goto err_free_rt;
 	}

 	df = OVS_CB(skb)->tun_key->tun_flags & TUNNEL_DONT_FRAGMENT ?
 		htons(IP_DF) : 0;

 	skb->ignore_df = 1;

 	return iptunnel_xmit(skb->sk, rt, skb, fl.saddr,
 			     OVS_CB(skb)->tun_key->ipv4_dst, IPPROTO_GRE,
 			     OVS_CB(skb)->tun_key->ipv4_tos,
 			     OVS_CB(skb)->tun_key->ipv4_ttl, df, false);
 err_free_rt:
 	ip_rt_put(rt);
 error:
 	return err;
 }

 static struct gre_cisco_protocol gre_protocol = {
 	.handler        = gre_rcv,
 	.err_handler    = gre_err,
 	.priority       = 1,
 };

 static int gre_ports;
 static int gre_init(void)
 {
 	int err;

 	gre_ports++;
 	if (gre_ports > 1)
 		return 0;

 	err = gre_cisco_register(&gre_protocol);
 	if (err)
 		pr_warn("cannot register gre protocol handler\n");

 	return err;
 }

 static void gre_exit(void)
 {
 	gre_ports--;
 	if (gre_ports > 0)
 		return;

 	gre_cisco_unregister(&gre_protocol);
 }

 static const char *gre_get_name(const struct vport *vport)
 {
 	return vport_priv(vport);
 }

 static struct vport *gre_create(const struct vport_parms *parms)
 {
 	struct net *net = ovs_dp_get_net(parms->dp);
 	struct ovs_net *ovs_net;
 	struct vport *vport;
 	int err;

 	err = gre_init();
 	if (err)
 		return ERR_PTR(err);

 	ovs_net = net_generic(net, ovs_net_id);
 	if (ovsl_dereference(ovs_net->vport_net.gre_vport)) {
 		vport = ERR_PTR(-EEXIST);
 		goto error;
 	}

 	vport = ovs_vport_alloc(IFNAMSIZ, &ovs_gre_vport_ops, parms);
 	if (IS_ERR(vport))
 		goto error;

 	strncpy(vport_priv(vport), parms->name, IFNAMSIZ);
 	rcu_assign_pointer(ovs_net->vport_net.gre_vport, vport);
 	return vport;

 error:
 	gre_exit();
 	return vport;
 }

 static void gre_tnl_destroy(struct vport *vport)
 {
 	struct net *net = ovs_dp_get_net(vport->dp);
 	struct ovs_net *ovs_net;

 	ovs_net = net_generic(net, ovs_net_id);

 	RCU_INIT_POINTER(ovs_net->vport_net.gre_vport, NULL);
 	ovs_vport_deferred_free(vport);
 	gre_exit();
 }

 const struct vport_ops ovs_gre_vport_ops = {
 	.type		= OVS_VPORT_TYPE_GRE,
 	.create		= gre_create,
 	.destroy	= gre_tnl_destroy,
 	.get_name	= gre_get_name,
 	.send		= gre_tnl_send,
 };
	/*
	* Copyright (c) 2007-2013 Nicira, Inc.
	*
	* This program is free software; you can redistribute it and/or
	* modify it under the terms of version 2 of the GNU General Public
	* License as published by the Free Software Foundation.
	*
	* This program is distributed in the hope that it will be useful, but
	* WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	* General Public License for more details.
	*
	* You should have received a copy of the GNU General Public License
	* along with this program; if not, write to the Free Software
	* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
	* 02110-1301, USA
	*/

	#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

	#include <linux/if.h>
	#include <linux/skbuff.h>
	#include <linux/ip.h>
	#include <linux/if_tunnel.h>
	#include <linux/if_vlan.h>
	#include <linux/in.h>
	#include <linux/in_route.h>
	#include <linux/inetdevice.h>
	#include <linux/jhash.h>
	#include <linux/list.h>
	#include <linux/kernel.h>
	#include <linux/workqueue.h>
	#include <linux/rculist.h>
	#include <net/route.h>
	#include <net/xfrm.h>

	#include <net/icmp.h>
	#include <net/ip.h>
	#include <net/ip_tunnels.h>
	#include <net/gre.h>
	#include <net/net_namespace.h>
	#include <net/netns/generic.h>
	#include <net/protocol.h>

	#include "datapath.h"
	#include "vport.h"

	/* Returns the least-significant 32 bits of a __be64. */
	static __be32 be64_get_low32(__be64 x)
	{
	#ifdef __BIG_ENDIAN
	return (__force __be32)x;
	#else
	return (__force __be32)((__force u64)x >> 32);
	#endif
	}

	static __be16 filter_tnl_flags(__be16 flags)
	{
	return flags & (TUNNEL_CSUM \| TUNNEL_KEY);
	}

	static struct sk_buff __build_header(struct sk_buff skb,
	int tunnel_hlen)
	{
	const struct ovs_key_ipv4_tunnel *tun_key = OVS_CB(skb)->tun_key;
	struct tnl_ptk_info tpi;

	skb = gre_handle_offloads(skb, !!(tun_key->tun_flags & TUNNEL_CSUM));
	if (IS_ERR(skb))
	return NULL;

	tpi.flags = filter_tnl_flags(tun_key->tun_flags);
	tpi.proto = htons(ETH_P_TEB);
	tpi.key = be64_get_low32(tun_key->tun_id);
	tpi.seq = 0;
	gre_build_header(skb, &tpi, tunnel_hlen);

	return skb;
	}

	static __be64 key_to_tunnel_id(__be32 key, __be32 seq)
	{
	#ifdef __BIG_ENDIAN
	return (__force __be64)((__force u64)seq << 32 \| (__force u32)key);
	#else
	return (__force __be64)((__force u64)key << 32 \| (__force u32)seq);
	#endif
	}

	/* Called with rcu_read_lock and BH disabled. */
	static int gre_rcv(struct sk_buff *skb,
	const struct tnl_ptk_info *tpi)
	{
	struct ovs_key_ipv4_tunnel tun_key;
	struct ovs_net *ovs_net;
	struct vport *vport;
	__be64 key;

	ovs_net = net_generic(dev_net(skb->dev), ovs_net_id);
	vport = rcu_dereference(ovs_net->vport_net.gre_vport);
	if (unlikely(!vport))
	return PACKET_REJECT;

	key = key_to_tunnel_id(tpi->key, tpi->seq);
	ovs_flow_tun_key_init(&tun_key, ip_hdr(skb), key,
	filter_tnl_flags(tpi->flags));

	ovs_vport_receive(vport, skb, &tun_key);
	return PACKET_RCVD;
	}

	/* Called with rcu_read_lock and BH disabled. */
	static int gre_err(struct sk_buff *skb, u32 info,
	const struct tnl_ptk_info *tpi)
	{
	struct ovs_net *ovs_net;
	struct vport *vport;

	ovs_net = net_generic(dev_net(skb->dev), ovs_net_id);
	vport = rcu_dereference(ovs_net->vport_net.gre_vport);

	if (unlikely(!vport))
	return PACKET_REJECT;
	else
	return PACKET_RCVD;
	}

	static int gre_tnl_send(struct vport vport, struct sk_buff skb)
	{
	struct net *net = ovs_dp_get_net(vport->dp);
	struct flowi4 fl;
	struct rtable *rt;
	int min_headroom;
	int tunnel_hlen;
	__be16 df;
	int err;

	if (unlikely(!OVS_CB(skb)->tun_key)) {
	err = -EINVAL;
	goto error;
	}

	/* Route lookup */
	memset(&fl, 0, sizeof(fl));
	fl.daddr = OVS_CB(skb)->tun_key->ipv4_dst;
	fl.saddr = OVS_CB(skb)->tun_key->ipv4_src;
	fl.flowi4_tos = RT_TOS(OVS_CB(skb)->tun_key->ipv4_tos);
	fl.flowi4_mark = skb->mark;
	fl.flowi4_proto = IPPROTO_GRE;

	rt = ip_route_output_key(net, &fl);
	if (IS_ERR(rt))
	return PTR_ERR(rt);

	tunnel_hlen = ip_gre_calc_hlen(OVS_CB(skb)->tun_key->tun_flags);

	min_headroom = LL_RESERVED_SPACE(rt->dst.dev) + rt->dst.header_len
	+ tunnel_hlen + sizeof(struct iphdr)
	+ (vlan_tx_tag_present(skb) ? VLAN_HLEN : 0);
	if (skb_headroom(skb) < min_headroom \|\| skb_header_cloned(skb)) {
	int head_delta = SKB_DATA_ALIGN(min_headroom -
	skb_headroom(skb) +
	16);
	err = pskb_expand_head(skb, max_t(int, head_delta, 0),
	0, GFP_ATOMIC);
	if (unlikely(err))
	goto err_free_rt;
	}

	if (vlan_tx_tag_present(skb)) {
	if (unlikely(!__vlan_put_tag(skb,
	skb->vlan_proto,
	vlan_tx_tag_get(skb)))) {
	err = -ENOMEM;
	goto err_free_rt;
	}
	skb->vlan_tci = 0;
	}

	/* Push Tunnel header. */
	skb = __build_header(skb, tunnel_hlen);
	if (unlikely(!skb)) {
	err = 0;
	goto err_free_rt;
	}

	df = OVS_CB(skb)->tun_key->tun_flags & TUNNEL_DONT_FRAGMENT ?
	htons(IP_DF) : 0;

	skb->ignore_df = 1;

	return iptunnel_xmit(skb->sk, rt, skb, fl.saddr,
	OVS_CB(skb)->tun_key->ipv4_dst, IPPROTO_GRE,
	OVS_CB(skb)->tun_key->ipv4_tos,
	OVS_CB(skb)->tun_key->ipv4_ttl, df, false);
	err_free_rt:
	ip_rt_put(rt);
	error:
	return err;
	}

	static struct gre_cisco_protocol gre_protocol = {
	.handler = gre_rcv,
	.err_handler = gre_err,
	.priority = 1,
	};

	static int gre_ports;
	static int gre_init(void)
	{
	int err;

	gre_ports++;
	if (gre_ports > 1)
	return 0;

	err = gre_cisco_register(&gre_protocol);
	if (err)
	pr_warn("cannot register gre protocol handler\n");

	return err;
	}

	static void gre_exit(void)
	{
	gre_ports--;
	if (gre_ports > 0)
	return;

	gre_cisco_unregister(&gre_protocol);
	}

	static const char gre_get_name(const struct vport vport)
	{
	return vport_priv(vport);
	}

	static struct vport gre_create(const struct vport_parms parms)
	{
	struct net *net = ovs_dp_get_net(parms->dp);
	struct ovs_net *ovs_net;
	struct vport *vport;
	int err;

	err = gre_init();
	if (err)
	return ERR_PTR(err);

	ovs_net = net_generic(net, ovs_net_id);
	if (ovsl_dereference(ovs_net->vport_net.gre_vport)) {
	vport = ERR_PTR(-EEXIST);
	goto error;
	}

	vport = ovs_vport_alloc(IFNAMSIZ, &ovs_gre_vport_ops, parms);
	if (IS_ERR(vport))
	goto error;

	strncpy(vport_priv(vport), parms->name, IFNAMSIZ);
	rcu_assign_pointer(ovs_net->vport_net.gre_vport, vport);
	return vport;

	error:
	gre_exit();
	return vport;
	}

	static void gre_tnl_destroy(struct vport *vport)
	{
	struct net *net = ovs_dp_get_net(vport->dp);
	struct ovs_net *ovs_net;

	ovs_net = net_generic(net, ovs_net_id);

	RCU_INIT_POINTER(ovs_net->vport_net.gre_vport, NULL);
	ovs_vport_deferred_free(vport);
	gre_exit();
	}

	const struct vport_ops ovs_gre_vport_ops = {
	.type = OVS_VPORT_TYPE_GRE,
	.create = gre_create,
	.destroy = gre_tnl_destroy,
	.get_name = gre_get_name,
	.send = gre_tnl_send,
	};