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>

1 files changed, 274 insertions, 0 deletions

diff --git a/net/openvswitch/vport-gre.c b/net/openvswitch/vport-gre.c
new file mode 100644
index 000000000000..3a8d1900aa78
--- /dev/null
+++ b/net/openvswitch/vport-gre.c
@@ -0,0 +1,274 @@
+/*
+ * 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
+ */
+
+#ifdef CONFIG_NET_IPGRE_DEMUX
+#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/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;
+}
+
+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->local_df = 1;
+
+        return iptunnel_xmit(net, 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);
+err_free_rt:
+        ip_rt_put(rt);
+error:
+        return err;
+}
+
+static struct gre_cisco_protocol gre_protocol = {
+        .handler        = gre_rcv,
+        .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_assign_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,
+};
+#endif