/*
- * 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
#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 "tunnel.h"
#include "vport.h"
+#include "vport-netdev.h"
-/*
- * The GRE header is composed of a series of sections: a base and then a variable
- * number of options.
- */
-#define GRE_HEADER_SECTION 4
-
-struct gre_base_hdr {
- __be16 flags;
- __be16 protocol;
-};
-
-static int gre_hdr_len(const struct ovs_key_ipv4_tunnel *tun_key)
-{
- int len = GRE_HEADER_SECTION;
-
- if (tun_key->tun_flags & OVS_TNL_F_KEY)
- len += GRE_HEADER_SECTION;
- if (tun_key->tun_flags & OVS_TNL_F_CSUM)
- len += GRE_HEADER_SECTION;
- return len;
-}
-
-static int gre64_hdr_len(const struct ovs_key_ipv4_tunnel *tun_key)
-{
- /* Set key for GRE64 tunnels, even when key if is zero. */
- int len = GRE_HEADER_SECTION + /* GRE Hdr */
- GRE_HEADER_SECTION + /* GRE Key */
- GRE_HEADER_SECTION; /* GRE SEQ */
-
- if (tun_key->tun_flags & OVS_TNL_F_CSUM)
- len += GRE_HEADER_SECTION;
-
- return len;
-}
-
-/* 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 __be32 be64_get_high32(__be64 x)
-{
-#ifdef __BIG_ENDIAN
- return (__force __be32)((__force u64)x >> 32);
-#else
- return (__force __be32)x;
-#endif
-}
+static struct vport_ops ovs_gre_vport_ops;
-static void __gre_build_header(struct sk_buff *skb,
- int tunnel_hlen,
- bool is_gre64)
+static struct vport *gre_tnl_create(const struct vport_parms *parms)
{
- const struct ovs_key_ipv4_tunnel *tun_key = OVS_CB(skb)->tun_key;
- __be32 *options = (__be32 *)(skb_network_header(skb) + tunnel_hlen
- - GRE_HEADER_SECTION);
- struct gre_base_hdr *greh = (struct gre_base_hdr *) skb_transport_header(skb);
- greh->protocol = htons(ETH_P_TEB);
- greh->flags = 0;
-
- /* Work backwards over the options so the checksum is last. */
- if (tun_key->tun_flags & OVS_TNL_F_KEY || is_gre64) {
- greh->flags |= GRE_KEY;
- if (is_gre64) {
- /* Set higher 32 bits to seq. */
- *options = be64_get_high32(tun_key->tun_id);
- options--;
- greh->flags |= GRE_SEQ;
- }
- *options = be64_get_low32(tun_key->tun_id);
- options--;
- }
-
- if (tun_key->tun_flags & OVS_TNL_F_CSUM) {
- greh->flags |= GRE_CSUM;
- *options = 0;
- *(__sum16 *)options = csum_fold(skb_checksum(skb,
- skb_transport_offset(skb),
- skb->len - skb_transport_offset(skb),
- 0));
- }
-}
-
-static void gre_build_header(const struct vport *vport,
- struct sk_buff *skb,
- int tunnel_hlen)
-{
- __gre_build_header(skb, tunnel_hlen, false);
-}
-
-static void gre64_build_header(const struct vport *vport,
- struct sk_buff *skb,
- int tunnel_hlen)
-{
- __gre_build_header(skb, tunnel_hlen, true);
-}
-
-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
-}
-
-static int parse_header(struct iphdr *iph, __be16 *flags, __be64 *tun_id,
- bool *is_gre64)
-{
- /* IP and ICMP protocol handlers check that the IHL is valid. */
- struct gre_base_hdr *greh = (struct gre_base_hdr *)((u8 *)iph + (iph->ihl << 2));
- __be32 *options = (__be32 *)(greh + 1);
- int hdr_len;
-
- *flags = greh->flags;
-
- if (unlikely(greh->flags & (GRE_VERSION | GRE_ROUTING)))
- return -EINVAL;
-
- if (unlikely(greh->protocol != htons(ETH_P_TEB)))
- return -EINVAL;
-
- hdr_len = GRE_HEADER_SECTION;
-
- if (greh->flags & GRE_CSUM) {
- hdr_len += GRE_HEADER_SECTION;
- options++;
- }
-
- if (greh->flags & GRE_KEY) {
- __be32 seq;
- __be32 gre_key;
-
- gre_key = *options;
- hdr_len += GRE_HEADER_SECTION;
- options++;
-
- if (greh->flags & GRE_SEQ) {
- seq = *options;
- *is_gre64 = true;
- } else {
- seq = 0;
- *is_gre64 = false;
- }
- *tun_id = key_to_tunnel_id(gre_key, seq);
- } else {
- *tun_id = 0;
- /* Ignore GRE seq if there is no key present. */
- *is_gre64 = false;
- }
-
- if (greh->flags & GRE_SEQ)
- hdr_len += GRE_HEADER_SECTION;
-
- return hdr_len;
-}
-
-static bool check_checksum(struct sk_buff *skb)
-{
- struct iphdr *iph = ip_hdr(skb);
- struct gre_base_hdr *greh = (struct gre_base_hdr *)(iph + 1);
- __sum16 csum = 0;
-
- if (greh->flags & GRE_CSUM) {
- switch (skb->ip_summed) {
- case CHECKSUM_COMPLETE:
- csum = csum_fold(skb->csum);
-
- if (!csum)
- break;
- /* Fall through. */
-
- case CHECKSUM_NONE:
- skb->csum = 0;
- csum = __skb_checksum_complete(skb);
- skb->ip_summed = CHECKSUM_COMPLETE;
- break;
- }
- }
-
- return (csum == 0);
-}
-
-static u32 gre_flags_to_tunnel_flags(__be16 gre_flags, bool is_gre64)
-{
- u32 tunnel_flags = 0;
-
- if (gre_flags & GRE_KEY || is_gre64)
- tunnel_flags = OVS_TNL_F_KEY;
-
- if (gre_flags & GRE_CSUM)
- tunnel_flags |= OVS_TNL_F_CSUM;
-
- return tunnel_flags;
-}
-
-/* Called with rcu_read_lock and BH disabled. */
-static int gre_rcv(struct sk_buff *skb)
-{
- struct ovs_net *ovs_net;
+ struct net *net = ovs_dp_get_net(parms->dp);
+ struct net_device *dev;
struct vport *vport;
- int hdr_len;
- struct iphdr *iph;
- struct ovs_key_ipv4_tunnel tun_key;
- __be16 gre_flags;
- u32 tnl_flags;
- __be64 key;
- bool is_gre64;
-
- if (unlikely(!pskb_may_pull(skb, sizeof(struct gre_base_hdr) + ETH_HLEN)))
- goto error;
- if (unlikely(!check_checksum(skb)))
- goto error;
-
- hdr_len = parse_header(ip_hdr(skb), &gre_flags, &key, &is_gre64);
- if (unlikely(hdr_len < 0))
- goto error;
-
- ovs_net = net_generic(dev_net(skb->dev), ovs_net_id);
- if (is_gre64)
- vport = rcu_dereference(ovs_net->vport_net.gre64_vport);
- else
- vport = rcu_dereference(ovs_net->vport_net.gre_vport);
- if (unlikely(!vport))
- goto error;
-
- if (unlikely(!pskb_may_pull(skb, hdr_len + ETH_HLEN)))
- goto error;
-
- iph = ip_hdr(skb);
- tnl_flags = gre_flags_to_tunnel_flags(gre_flags, is_gre64);
- tnl_tun_key_init(&tun_key, iph, key, tnl_flags);
- OVS_CB(skb)->tun_key = &tun_key;
-
- __skb_pull(skb, hdr_len);
- skb_postpull_rcsum(skb, skb_transport_header(skb), hdr_len + ETH_HLEN);
-
- ovs_tnl_rcv(vport, skb);
- return 0;
-
-error:
- kfree_skb(skb);
- return 0;
-}
-static const struct net_protocol gre_protocol_handlers = {
- .handler = gre_rcv,
-#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,32)
- .netns_ok = 1,
-#endif
-};
-
-static bool inited;
-
-static int gre_init(void)
-{
- int err;
-
- if (inited)
- return 0;
-
- inited = true;
- err = inet_add_protocol(&gre_protocol_handlers, IPPROTO_GRE);
- if (err)
- pr_warn("cannot register gre protocol handler\n");
-
- return err;
-}
-
-static void gre_exit(void)
-{
- if (!inited)
- return;
+ vport = ovs_vport_alloc(0, &ovs_gre_vport_ops, parms);
+ if (IS_ERR(vport))
+ return vport;
- inited = false;
+ 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);
+ }
- inet_del_protocol(&gre_protocol_handlers, IPPROTO_GRE);
-}
+ 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;
- ovs_net = net_generic(net, ovs_net_id);
- if (ovsl_dereference(ovs_net->vport_net.gre_vport))
- return ERR_PTR(-EEXIST);
-
- vport = ovs_vport_alloc(IFNAMSIZ, &ovs_gre_vport_ops, parms);
+ vport = gre_tnl_create(parms);
if (IS_ERR(vport))
return vport;
- strncpy(vport_priv(vport), parms->name, IFNAMSIZ);
- rcu_assign_pointer(ovs_net->vport_net.gre_vport, vport);
- 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_assign_pointer(ovs_net->vport_net.gre_vport, NULL);
- ovs_vport_deferred_free(vport);
+ return ovs_tunnel_get_egress_info(upcall, ovs_dp_get_net(vport->dp),
+ skb, IPPROTO_GRE, 0, 0);
}
-static int gre_tnl_send(struct vport *vport, struct sk_buff *skb)
-{
- int hlen;
-
- if (unlikely(!OVS_CB(skb)->tun_key)) {
- kfree_skb(skb);
- ovs_vport_record_error(vport, VPORT_E_TX_ERROR);
- return 0;
- }
-
- hlen = gre_hdr_len(OVS_CB(skb)->tun_key);
- return ovs_tnl_send(vport, skb, IPPROTO_GRE, hlen, gre_build_header);
-}
-
-const struct vport_ops ovs_gre_vport_ops = {
+static struct vport_ops ovs_gre_vport_ops = {
.type = OVS_VPORT_TYPE_GRE,
- .flags = VPORT_F_TUN_ID,
- .init = gre_init,
- .exit = gre_exit,
.create = gre_create,
- .destroy = gre_tnl_destroy,
- .get_name = gre_get_name,
- .send = gre_tnl_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;
-
- ovs_net = net_generic(net, ovs_net_id);
- if (ovsl_dereference(ovs_net->vport_net.gre64_vport))
- return ERR_PTR(-EEXIST);
-
- vport = ovs_vport_alloc(IFNAMSIZ, &ovs_gre64_vport_ops, parms);
- if (IS_ERR(vport))
- return vport;
-
- strncpy(vport_priv(vport), parms->name, IFNAMSIZ);
- rcu_assign_pointer(ovs_net->vport_net.gre64_vport, vport);
- 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);
+ ovs_vport_ops_unregister(&ovs_gre_vport_ops);
}
-static int gre64_tnl_send(struct vport *vport, struct sk_buff *skb)
-{
- int hlen;
-
- if (unlikely(!OVS_CB(skb)->tun_key)) {
- ovs_vport_record_error(vport, VPORT_E_TX_ERROR);
- kfree_skb(skb);
- return 0;
- }
+module_init(ovs_gre_tnl_init);
+module_exit(ovs_gre_tnl_exit);
- hlen = gre64_hdr_len(OVS_CB(skb)->tun_key);
- return ovs_tnl_send(vport, skb, IPPROTO_GRE, hlen, gre64_build_header);
-}
-
-const struct vport_ops ovs_gre64_vport_ops = {
- .type = OVS_VPORT_TYPE_GRE64,
- .flags = VPORT_F_TUN_ID,
- .init = gre_init,
- .exit = gre_exit,
- .create = gre64_create,
- .destroy = gre64_tnl_destroy,
- .get_name = gre_get_name,
- .send = gre64_tnl_send,
-};
+MODULE_DESCRIPTION("OVS: GRE switching port");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("vport-type-3");
projects / cascardo / ovs.git / blobdiff