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authorAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
committerAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
commit57f0f512b273f60d52568b8c6b77e17f5636edc0 (patch)
tree5e910f0e82173f4ef4f51111366a3f1299037a7b /net/openvswitch/vport-gre.c
Initial import
Diffstat (limited to 'net/openvswitch/vport-gre.c')
-rw-r--r--net/openvswitch/vport-gre.c313
1 files changed, 313 insertions, 0 deletions
diff --git a/net/openvswitch/vport-gre.c b/net/openvswitch/vport-gre.c
new file mode 100644
index 000000000..f17ac9642
--- /dev/null
+++ b/net/openvswitch/vport-gre.c
@@ -0,0 +1,313 @@
+/*
+ * Copyright (c) 2007-2014 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/module.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"
+
+static struct vport_ops ovs_gre_vport_ops;
+
+/* 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)
+{
+ struct tnl_ptk_info tpi;
+ const struct ovs_key_ipv4_tunnel *tun_key;
+
+ tun_key = &OVS_CB(skb)->egress_tun_info->tunnel;
+
+ skb = gre_handle_offloads(skb, !!(tun_key->tun_flags & TUNNEL_CSUM));
+ if (IS_ERR(skb))
+ return skb;
+
+ 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_tunnel_info tun_info;
+ 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_info_init(&tun_info, ip_hdr(skb), 0, 0, key,
+ filter_tnl_flags(tpi->flags), NULL, 0);
+
+ ovs_vport_receive(vport, skb, &tun_info);
+ 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);
+ const struct ovs_key_ipv4_tunnel *tun_key;
+ struct flowi4 fl;
+ struct rtable *rt;
+ int min_headroom;
+ int tunnel_hlen;
+ __be16 df;
+ int err;
+
+ if (unlikely(!OVS_CB(skb)->egress_tun_info)) {
+ err = -EINVAL;
+ goto err_free_skb;
+ }
+
+ tun_key = &OVS_CB(skb)->egress_tun_info->tunnel;
+ rt = ovs_tunnel_route_lookup(net, tun_key, skb->mark, &fl, IPPROTO_GRE);
+ if (IS_ERR(rt)) {
+ err = PTR_ERR(rt);
+ goto err_free_skb;
+ }
+
+ tunnel_hlen = ip_gre_calc_hlen(tun_key->tun_flags);
+
+ min_headroom = LL_RESERVED_SPACE(rt->dst.dev) + rt->dst.header_len
+ + tunnel_hlen + sizeof(struct iphdr)
+ + (skb_vlan_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;
+ }
+
+ skb = vlan_hwaccel_push_inside(skb);
+ if (unlikely(!skb)) {
+ err = -ENOMEM;
+ goto err_free_rt;
+ }
+
+ /* Push Tunnel header. */
+ skb = __build_header(skb, tunnel_hlen);
+ if (IS_ERR(skb)) {
+ err = PTR_ERR(skb);
+ skb = NULL;
+ goto err_free_rt;
+ }
+
+ df = tun_key->tun_flags & TUNNEL_DONT_FRAGMENT ?
+ htons(IP_DF) : 0;
+
+ skb->ignore_df = 1;
+
+ return iptunnel_xmit(skb->sk, rt, skb, fl.saddr,
+ tun_key->ipv4_dst, IPPROTO_GRE,
+ tun_key->ipv4_tos, tun_key->ipv4_ttl, df, false);
+err_free_rt:
+ ip_rt_put(rt);
+err_free_skb:
+ kfree_skb(skb);
+ 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();
+}
+
+static int gre_get_egress_tun_info(struct vport *vport, struct sk_buff *skb,
+ struct ovs_tunnel_info *egress_tun_info)
+{
+ return ovs_tunnel_get_egress_info(egress_tun_info,
+ ovs_dp_get_net(vport->dp),
+ OVS_CB(skb)->egress_tun_info,
+ IPPROTO_GRE, skb->mark, 0, 0);
+}
+
+static 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,
+ .get_egress_tun_info = gre_get_egress_tun_info,
+ .owner = THIS_MODULE,
+};
+
+static int __init ovs_gre_tnl_init(void)
+{
+ return ovs_vport_ops_register(&ovs_gre_vport_ops);
+}
+
+static void __exit ovs_gre_tnl_exit(void)
+{
+ ovs_vport_ops_unregister(&ovs_gre_vport_ops);
+}
+
+module_init(ovs_gre_tnl_init);
+module_exit(ovs_gre_tnl_exit);
+
+MODULE_DESCRIPTION("OVS: GRE switching port");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("vport-type-3");