/*
- * Copyright (c) 2007-2012 Nicira, Inc.
+ * Copyright (c) 2007-2015 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
* 02110-1301, USA
*/
-#include <linux/kconfig.h>
-#if IS_ENABLED(CONFIG_NET_IPGRE_DEMUX)
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/if.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/net_namespace.h>
-#include <net/netns/generic.h>
#include <net/route.h>
#include <net/xfrm.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"
+#include "vport-netdev.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,
- __be32 seq, __be16 gre64_flag)
-{
- const struct ovs_key_ipv4_tunnel *tun_key = &OVS_CB(skb)->tun_info->tunnel;
- 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) | gre64_flag;
-
- tpi.proto = htons(ETH_P_TEB);
- tpi.key = be64_get_low32(tun_key->tun_id);
- tpi.seq = seq;
- 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);
- if ((tpi->flags & TUNNEL_KEY) && (tpi->flags & TUNNEL_SEQ))
- vport = rcu_dereference(ovs_net->vport_net.gre64_vport);
- else
- vport = rcu_dereference(ovs_net->vport_net.gre_vport);
- if (unlikely(!vport))
- return PACKET_REJECT;
+static struct vport_ops ovs_gre_vport_ops;
- key = key_to_tunnel_id(tpi->key, tpi->seq);
- ovs_flow_tun_info_init(&tun_info, ip_hdr(skb), 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)
+static struct vport *gre_tnl_create(const struct vport_parms *parms)
{
- struct ovs_net *ovs_net;
+ struct net *net = ovs_dp_get_net(parms->dp);
+ struct net_device *dev;
struct vport *vport;
- ovs_net = net_generic(dev_net(skb->dev), ovs_net_id);
- if ((tpi->flags & TUNNEL_KEY) && (tpi->flags & TUNNEL_SEQ))
- vport = rcu_dereference(ovs_net->vport_net.gre64_vport);
- else
- vport = rcu_dereference(ovs_net->vport_net.gre_vport);
-
- if (unlikely(!vport))
- return PACKET_REJECT;
- else
- return PACKET_RCVD;
-}
-
-static int __send(struct vport *vport, struct sk_buff *skb,
- int tunnel_hlen,
- __be32 seq, __be16 gre64_flag)
-{
- struct ovs_key_ipv4_tunnel *tun_key = &OVS_CB(skb)->tun_info->tunnel;
- struct rtable *rt;
- int min_headroom;
- __be16 df;
- __be32 saddr;
- int err;
-
- /* Route lookup */
- saddr = tun_key->ipv4_src;
- rt = find_route(ovs_dp_get_net(vport->dp),
- &saddr, tun_key->ipv4_dst,
- IPPROTO_GRE, tun_key->ipv4_tos,
- skb->mark);
- if (IS_ERR(rt)) {
- err = PTR_ERR(rt);
- goto error;
- }
-
- min_headroom = LL_RESERVED_SPACE(rt_dst(rt).dev) + rt_dst(rt).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;
- }
- vlan_set_tci(skb, 0);
- }
-
- /* Push Tunnel header. */
- skb = __build_header(skb, tunnel_hlen, seq, gre64_flag);
- if (unlikely(!skb)) {
- err = 0;
- goto err_free_rt;
+ vport = ovs_vport_alloc(0, &ovs_gre_vport_ops, parms);
+ if (IS_ERR(vport))
+ return vport;
+
+ rtnl_lock();
+ dev = gretap_fb_dev_create(net, parms->name, NET_NAME_USER);
+ if (IS_ERR(dev)) {
+ rtnl_unlock();
+ ovs_vport_free(vport);
+ return ERR_CAST(dev);
}
- df = tun_key->tun_flags & TUNNEL_DONT_FRAGMENT ? htons(IP_DF) : 0;
- skb->local_df = 1;
-
- return iptunnel_xmit(rt, skb, saddr,
- tun_key->ipv4_dst, IPPROTO_GRE,
- tun_key->ipv4_tos,
- 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);
-}
+ dev_change_flags(dev, dev->flags | IFF_UP);
+ rtnl_unlock();
-static const char *gre_get_name(const struct vport *vport)
-{
- return vport_priv(vport);
+ return 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);
+ vport = gre_tnl_create(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;
+ return vport;
-error:
- gre_exit();
- return vport;
+ return ovs_netdev_link(vport, parms->name);
}
-static void gre_tnl_destroy(struct vport *vport)
+static int gre_get_egress_tun_info(struct vport *vport, struct sk_buff *skb,
+ struct dp_upcall_info *upcall)
{
- 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_send(struct vport *vport, struct sk_buff *skb)
-{
- int hlen;
-
- if (unlikely(!OVS_CB(skb)->tun_info))
- return -EINVAL;
-
- hlen = ip_gre_calc_hlen(OVS_CB(skb)->tun_info->tunnel.tun_flags);
-
- return __send(vport, skb, hlen, 0, 0);
+ return ovs_tunnel_get_egress_info(upcall, ovs_dp_get_net(vport->dp),
+ skb, IPPROTO_GRE, 0, 0);
}
-const struct vport_ops ovs_gre_vport_ops = {
+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_send,
+ .send = gre_fb_xmit,
+ .get_egress_tun_info = gre_get_egress_tun_info,
+ .destroy = ovs_netdev_tunnel_destroy,
};
-/* GRE64 vport. */
-static struct vport *gre64_create(const struct vport_parms *parms)
+static int __init ovs_gre_tnl_init(void)
{
- 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.gre64_vport)) {
- vport = ERR_PTR(-EEXIST);
- goto error;
- }
-
- vport = ovs_vport_alloc(IFNAMSIZ, &ovs_gre64_vport_ops, parms);
- if (IS_ERR(vport))
- goto error;
-
- strncpy(vport_priv(vport), parms->name, IFNAMSIZ);
- rcu_assign_pointer(ovs_net->vport_net.gre64_vport, vport);
- return vport;
-error:
- gre_exit();
- return vport;
+ return ovs_vport_ops_register(&ovs_gre_vport_ops);
}
-static void gre64_tnl_destroy(struct vport *vport)
+static void __exit ovs_gre_tnl_exit(void)
{
- 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.gre64_vport, NULL);
- ovs_vport_deferred_free(vport);
- gre_exit();
-}
-
-static __be32 be64_get_high32(__be64 x)
-{
-#ifdef __BIG_ENDIAN
- return (__force __be32)((__force u64)x >> 32);
-#else
- return (__force __be32)x;
-#endif
+ ovs_vport_ops_unregister(&ovs_gre_vport_ops);
}
-static int gre64_send(struct vport *vport, struct sk_buff *skb)
-{
- int hlen = GRE_HEADER_SECTION + /* GRE Hdr */
- GRE_HEADER_SECTION + /* GRE Key */
- GRE_HEADER_SECTION; /* GRE SEQ */
- __be32 seq;
+module_init(ovs_gre_tnl_init);
+module_exit(ovs_gre_tnl_exit);
- if (unlikely(!OVS_CB(skb)->tun_info))
- return -EINVAL;
-
- if (OVS_CB(skb)->tun_info->tunnel.tun_flags & TUNNEL_CSUM)
- hlen += GRE_HEADER_SECTION;
-
- seq = be64_get_high32(OVS_CB(skb)->tun_info->tunnel.tun_id);
- return __send(vport, skb, hlen, seq, (TUNNEL_KEY|TUNNEL_SEQ));
-}
-
-const struct vport_ops ovs_gre64_vport_ops = {
- .type = OVS_VPORT_TYPE_GRE64,
- .create = gre64_create,
- .destroy = gre64_tnl_destroy,
- .get_name = gre_get_name,
- .send = gre64_send,
-};
-#endif
+MODULE_DESCRIPTION("OVS: GRE switching port");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("vport-type-3");
projects / cascardo / ovs.git / blobdiff