openvswitch: Add gre tunnel support.
Add gre vport implementation. Most of gre protocol processing is pushed to gre module. It make use of gre demultiplexer therefore it can co-exist with linux device based gre tunnels. Signed-off-by: Pravin B Shelar <pshelar@nicira.com> Acked-by: Jesse Gross <jesse@nicira.com> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Pravin B Shelar
David S. Miller
parent
a3e82996a8
commit
aa310701e7
@ -164,6 +164,7 @@ enum ovs_vport_type {
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OVS_VPORT_TYPE_UNSPEC,
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OVS_VPORT_TYPE_NETDEV, /* network device */
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OVS_VPORT_TYPE_INTERNAL, /* network device implemented by datapath */
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OVS_VPORT_TYPE_GRE, /* GRE tunnel. */
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__OVS_VPORT_TYPE_MAX
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};
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@ -19,6 +19,8 @@ config OPENVSWITCH
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which is able to accept configuration from a variety of sources and
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translate it into packet processing rules.
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Open vSwitch GRE support depends on CONFIG_NET_IPGRE_DEMUX.
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See http://openvswitch.org for more information and userspace
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utilities.
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@ -10,5 +10,6 @@ openvswitch-y := \
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dp_notify.o \
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flow.o \
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vport.o \
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vport-gre.o \
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vport-internal_dev.o \
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vport-netdev.o \
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vport-netdev.o
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@ -122,6 +122,7 @@ struct dp_upcall_info {
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struct ovs_net {
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struct list_head dps;
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struct work_struct dp_notify_work;
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struct vport_net vport_net;
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};
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extern int ovs_net_id;
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@ -49,11 +49,27 @@ struct ovs_key_ipv4_tunnel {
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__be64 tun_id;
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__be32 ipv4_src;
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__be32 ipv4_dst;
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u16 tun_flags;
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__be16 tun_flags;
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u8 ipv4_tos;
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u8 ipv4_ttl;
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};
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static inline void ovs_flow_tun_key_init(struct ovs_key_ipv4_tunnel *tun_key,
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const struct iphdr *iph, __be64 tun_id,
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__be16 tun_flags)
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{
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tun_key->tun_id = tun_id;
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tun_key->ipv4_src = iph->saddr;
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tun_key->ipv4_dst = iph->daddr;
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tun_key->ipv4_tos = iph->tos;
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tun_key->ipv4_ttl = iph->ttl;
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tun_key->tun_flags = tun_flags;
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/* clear struct padding. */
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memset((unsigned char *) tun_key + OVS_TUNNEL_KEY_SIZE, 0,
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sizeof(*tun_key) - OVS_TUNNEL_KEY_SIZE);
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}
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struct sw_flow_key {
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struct ovs_key_ipv4_tunnel tun_key; /* Encapsulating tunnel key. */
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struct {
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274
net/openvswitch/vport-gre.c
Normal file
274
net/openvswitch/vport-gre.c
Normal file
@ -0,0 +1,274 @@
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/*
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* Copyright (c) 2007-2013 Nicira, 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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#ifdef CONFIG_NET_IPGRE_DEMUX
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/if.h>
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#include <linux/skbuff.h>
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#include <linux/ip.h>
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#include <linux/if_tunnel.h>
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#include <linux/if_vlan.h>
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#include <linux/in.h>
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#include <linux/if_vlan.h>
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#include <linux/in.h>
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#include <linux/in_route.h>
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#include <linux/inetdevice.h>
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#include <linux/jhash.h>
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#include <linux/list.h>
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#include <linux/kernel.h>
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#include <linux/workqueue.h>
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#include <linux/rculist.h>
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#include <net/route.h>
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#include <net/xfrm.h>
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#include <net/icmp.h>
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#include <net/ip.h>
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#include <net/ip_tunnels.h>
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#include <net/gre.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/protocol.h>
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#include "datapath.h"
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#include "vport.h"
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/* Returns the least-significant 32 bits of a __be64. */
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static __be32 be64_get_low32(__be64 x)
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{
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#ifdef __BIG_ENDIAN
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return (__force __be32)x;
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#else
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return (__force __be32)((__force u64)x >> 32);
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#endif
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}
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static __be16 filter_tnl_flags(__be16 flags)
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{
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return flags & (TUNNEL_CSUM | TUNNEL_KEY);
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}
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static struct sk_buff *__build_header(struct sk_buff *skb,
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int tunnel_hlen)
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{
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const struct ovs_key_ipv4_tunnel *tun_key = OVS_CB(skb)->tun_key;
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struct tnl_ptk_info tpi;
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skb = gre_handle_offloads(skb, !!(tun_key->tun_flags & TUNNEL_CSUM));
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if (IS_ERR(skb))
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return NULL;
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tpi.flags = filter_tnl_flags(tun_key->tun_flags);
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tpi.proto = htons(ETH_P_TEB);
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tpi.key = be64_get_low32(tun_key->tun_id);
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tpi.seq = 0;
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gre_build_header(skb, &tpi, tunnel_hlen);
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return skb;
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}
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static __be64 key_to_tunnel_id(__be32 key, __be32 seq)
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{
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#ifdef __BIG_ENDIAN
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return (__force __be64)((__force u64)seq << 32 | (__force u32)key);
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#else
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return (__force __be64)((__force u64)key << 32 | (__force u32)seq);
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#endif
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}
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/* Called with rcu_read_lock and BH disabled. */
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static int gre_rcv(struct sk_buff *skb,
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const struct tnl_ptk_info *tpi)
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{
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struct ovs_key_ipv4_tunnel tun_key;
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struct ovs_net *ovs_net;
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struct vport *vport;
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__be64 key;
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ovs_net = net_generic(dev_net(skb->dev), ovs_net_id);
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vport = rcu_dereference(ovs_net->vport_net.gre_vport);
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if (unlikely(!vport))
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return PACKET_REJECT;
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key = key_to_tunnel_id(tpi->key, tpi->seq);
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ovs_flow_tun_key_init(&tun_key, ip_hdr(skb), key,
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filter_tnl_flags(tpi->flags));
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ovs_vport_receive(vport, skb, &tun_key);
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return PACKET_RCVD;
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}
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static int gre_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 flowi4 fl;
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struct rtable *rt;
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int min_headroom;
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int tunnel_hlen;
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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_GRE;
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rt = ip_route_output_key(net, &fl);
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if (IS_ERR(rt))
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return PTR_ERR(rt);
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tunnel_hlen = ip_gre_calc_hlen(OVS_CB(skb)->tun_key->tun_flags);
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min_headroom = LL_RESERVED_SPACE(rt->dst.dev) + rt->dst.header_len
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+ tunnel_hlen + sizeof(struct iphdr)
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+ (vlan_tx_tag_present(skb) ? VLAN_HLEN : 0);
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if (skb_headroom(skb) < min_headroom || skb_header_cloned(skb)) {
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int head_delta = SKB_DATA_ALIGN(min_headroom -
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skb_headroom(skb) +
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16);
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err = pskb_expand_head(skb, max_t(int, head_delta, 0),
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0, GFP_ATOMIC);
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if (unlikely(err))
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goto err_free_rt;
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}
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if (vlan_tx_tag_present(skb)) {
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if (unlikely(!__vlan_put_tag(skb,
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skb->vlan_proto,
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vlan_tx_tag_get(skb)))) {
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err = -ENOMEM;
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goto err_free_rt;
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}
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skb->vlan_tci = 0;
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}
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/* Push Tunnel header. */
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skb = __build_header(skb, tunnel_hlen);
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if (unlikely(!skb)) {
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err = 0;
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goto err_free_rt;
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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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return iptunnel_xmit(net, rt, skb, fl.saddr,
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OVS_CB(skb)->tun_key->ipv4_dst, IPPROTO_GRE,
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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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err_free_rt:
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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 struct gre_cisco_protocol gre_protocol = {
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.handler = gre_rcv,
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.priority = 1,
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};
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static int gre_ports;
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static int gre_init(void)
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{
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int err;
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gre_ports++;
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if (gre_ports > 1)
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return 0;
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err = gre_cisco_register(&gre_protocol);
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if (err)
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pr_warn("cannot register gre protocol handler\n");
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return err;
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}
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static void gre_exit(void)
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{
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gre_ports--;
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if (gre_ports > 0)
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return;
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gre_cisco_unregister(&gre_protocol);
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}
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static const char *gre_get_name(const struct vport *vport)
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{
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return vport_priv(vport);
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}
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static struct vport *gre_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 ovs_net *ovs_net;
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struct vport *vport;
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int err;
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err = gre_init();
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if (err)
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return ERR_PTR(err);
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ovs_net = net_generic(net, ovs_net_id);
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if (ovsl_dereference(ovs_net->vport_net.gre_vport)) {
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vport = ERR_PTR(-EEXIST);
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goto error;
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}
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vport = ovs_vport_alloc(IFNAMSIZ, &ovs_gre_vport_ops, parms);
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if (IS_ERR(vport))
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goto error;
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strncpy(vport_priv(vport), parms->name, IFNAMSIZ);
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rcu_assign_pointer(ovs_net->vport_net.gre_vport, vport);
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return vport;
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error:
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gre_exit();
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return vport;
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}
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static void gre_tnl_destroy(struct vport *vport)
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{
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struct net *net = ovs_dp_get_net(vport->dp);
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struct ovs_net *ovs_net;
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ovs_net = net_generic(net, ovs_net_id);
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rcu_assign_pointer(ovs_net->vport_net.gre_vport, NULL);
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ovs_vport_deferred_free(vport);
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gre_exit();
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}
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const struct vport_ops ovs_gre_vport_ops = {
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.type = OVS_VPORT_TYPE_GRE,
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.create = gre_create,
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.destroy = gre_tnl_destroy,
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.get_name = gre_get_name,
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.send = gre_tnl_send,
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};
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#endif
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@ -38,6 +38,10 @@
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static const struct vport_ops *vport_ops_list[] = {
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&ovs_netdev_vport_ops,
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&ovs_internal_vport_ops,
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#ifdef CONFIG_NET_IPGRE_DEMUX
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&ovs_gre_vport_ops,
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#endif
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};
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/* Protected by RCU read lock for reading, ovs_mutex for writing. */
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@ -404,3 +408,18 @@ void ovs_vport_record_error(struct vport *vport, enum vport_err_type err_type)
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spin_unlock(&vport->stats_lock);
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}
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static void free_vport_rcu(struct rcu_head *rcu)
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{
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struct vport *vport = container_of(rcu, struct vport, rcu);
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ovs_vport_free(vport);
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}
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void ovs_vport_deferred_free(struct vport *vport)
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{
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if (!vport)
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return;
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call_rcu(&vport->rcu, free_vport_rcu);
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}
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@ -34,6 +34,11 @@ struct vport_parms;
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/* The following definitions are for users of the vport subsytem: */
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/* The following definitions are for users of the vport subsytem: */
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struct vport_net {
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struct vport __rcu *gre_vport;
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};
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int ovs_vport_init(void);
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void ovs_vport_exit(void);
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@ -152,6 +157,7 @@ enum vport_err_type {
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struct vport *ovs_vport_alloc(int priv_size, const struct vport_ops *,
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const struct vport_parms *);
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void ovs_vport_free(struct vport *);
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void ovs_vport_deferred_free(struct vport *vport);
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#define VPORT_ALIGN 8
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@ -192,6 +198,7 @@ void ovs_vport_record_error(struct vport *, enum vport_err_type err_type);
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* add yours to the list at the top of vport.c. */
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extern const struct vport_ops ovs_netdev_vport_ops;
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extern const struct vport_ops ovs_internal_vport_ops;
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extern const struct vport_ops ovs_gre_vport_ops;
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static inline void ovs_skb_postpush_rcsum(struct sk_buff *skb,
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const void *start, unsigned int len)
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