/*
- * Copyright (c) 2011 Nicira, Inc.
- * Copyright (c) 2012 Cisco Systems, Inc.
+ * Copyright (c) 2015 Nicira, Inc.
+ * Copyright (c) 2013 Cisco Systems, 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
*/
-#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
-
-#include <linux/version.h>
-#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,26)
-
-#include <linux/in.h>
-#include <linux/ip.h>
-#include <linux/net.h>
-#include <linux/rculist.h>
-#include <linux/udp.h>
-
-#include <net/icmp.h>
-#include <net/ip.h>
+#include <linux/kernel.h>
+#include <linux/skbuff.h>
+#include <linux/openvswitch.h>
+#include <linux/module.h>
#include <net/udp.h>
+#include <net/ip_tunnels.h>
+#include <net/rtnetlink.h>
+#include <net/vxlan.h>
#include "datapath.h"
-#include "tunnel.h"
#include "vport.h"
+#include "vport-netdev.h"
-#define VXLAN_FLAGS 0x08000000 /* struct vxlanhdr.vx_flags required value. */
-
-/**
- * struct vxlanhdr - VXLAN header
- * @vx_flags: Must have the exact value %VXLAN_FLAGS.
- * @vx_vni: VXLAN Network Identifier (VNI) in top 24 bits, low 8 bits zeroed.
- */
-struct vxlanhdr {
- __be32 vx_flags;
- __be32 vx_vni;
-};
+static struct vport_ops ovs_vxlan_netdev_vport_ops;
-#define VXLAN_HLEN (sizeof(struct udphdr) + sizeof(struct vxlanhdr))
-
-static inline int vxlan_hdr_len(const struct ovs_key_ipv4_tunnel *tun_key)
+static int vxlan_get_options(const struct vport *vport, struct sk_buff *skb)
{
- return VXLAN_HLEN;
-}
+ struct vxlan_dev *vxlan = netdev_priv(vport->dev);
+ __be16 dst_port = vxlan->cfg.dst_port;
-/**
- * struct vxlan_port - Keeps track of open UDP ports
- * @list: list element.
- * @vport: vport for the tunnel.
- * @socket: The socket created for this port number.
- */
-struct vxlan_port {
- struct list_head list;
- struct vport *vport;
- struct socket *vxlan_rcv_socket;
- struct rcu_head rcu;
-};
+ if (nla_put_u16(skb, OVS_TUNNEL_ATTR_DST_PORT, ntohs(dst_port)))
+ return -EMSGSIZE;
-static LIST_HEAD(vxlan_ports);
+ if (vxlan->flags & VXLAN_F_GBP) {
+ struct nlattr *exts;
-static struct vxlan_port *vxlan_find_port(struct net *net, __be16 port)
-{
- struct vxlan_port *vxlan_port;
+ exts = nla_nest_start(skb, OVS_TUNNEL_ATTR_EXTENSION);
+ if (!exts)
+ return -EMSGSIZE;
- list_for_each_entry_rcu(vxlan_port, &vxlan_ports, list) {
- struct tnl_vport *tnl_vport = tnl_vport_priv(vxlan_port->vport);
+ if (vxlan->flags & VXLAN_F_GBP &&
+ nla_put_flag(skb, OVS_VXLAN_EXT_GBP))
+ return -EMSGSIZE;
- if (tnl_vport->dst_port == port &&
- net_eq(sock_net(vxlan_port->vxlan_rcv_socket->sk), net))
- return vxlan_port;
+ nla_nest_end(skb, exts);
}
- return NULL;
-}
-
-static inline struct vxlanhdr *vxlan_hdr(const struct sk_buff *skb)
-{
- return (struct vxlanhdr *)(udp_hdr(skb) + 1);
-}
-
-static void vxlan_build_header(const struct vport *vport,
- struct sk_buff *skb,
- int tunnel_hlen)
-{
- struct tnl_vport *tnl_vport = tnl_vport_priv(vport);
- struct udphdr *udph = udp_hdr(skb);
- struct vxlanhdr *vxh = (struct vxlanhdr *)(udph + 1);
- const struct ovs_key_ipv4_tunnel *tun_key = OVS_CB(skb)->tun_key;
-
- udph->dest = tnl_vport->dst_port;
- udph->source = htons(ovs_tnl_get_src_port(skb));
- udph->check = 0;
- udph->len = htons(skb->len - skb_transport_offset(skb));
-
- vxh->vx_flags = htonl(VXLAN_FLAGS);
- vxh->vx_vni = htonl(be64_to_cpu(tun_key->tun_id) << 8);
-
- /*
- * Allow our local IP stack to fragment the outer packet even if the
- * DF bit is set as a last resort. We also need to force selection of
- * an IP ID here because Linux will otherwise leave it at 0 if the
- * packet originally had DF set.
- */
- skb->local_df = 1;
- __ip_select_ident(ip_hdr(skb), skb_dst(skb), 0);
-}
-
-/* Called with rcu_read_lock and BH disabled. */
-static int vxlan_rcv(struct sock *sk, struct sk_buff *skb)
-{
- struct vxlan_port *vxlan_vport;
- struct vxlanhdr *vxh;
- struct iphdr *iph;
- struct ovs_key_ipv4_tunnel tun_key;
- __be64 key;
-
- vxlan_vport = vxlan_find_port(dev_net(skb->dev), udp_hdr(skb)->dest);
- if (unlikely(!vxlan_vport))
- goto error;
-
- if (unlikely(!pskb_may_pull(skb, VXLAN_HLEN + ETH_HLEN)))
- goto error;
-
- vxh = vxlan_hdr(skb);
- if (unlikely(vxh->vx_flags != htonl(VXLAN_FLAGS) ||
- vxh->vx_vni & htonl(0xff)))
- goto error;
-
- __skb_pull(skb, VXLAN_HLEN);
- skb_postpull_rcsum(skb, skb_transport_header(skb), VXLAN_HLEN + ETH_HLEN);
-
- key = cpu_to_be64(ntohl(vxh->vx_vni) >> 8);
-
- /* Save outer tunnel values */
- iph = ip_hdr(skb);
- tnl_tun_key_init(&tun_key, iph, key, OVS_TNL_F_KEY);
- OVS_CB(skb)->tun_key = &tun_key;
-
- ovs_tnl_rcv(vxlan_vport->vport, skb);
- goto out;
-
-error:
- kfree_skb(skb);
-out:
return 0;
}
-/* Random value. Irrelevant as long as it's not 0 since we set the handler. */
-#define UDP_ENCAP_VXLAN 1
-static int vxlan_socket_init(struct vxlan_port *vxlan_port, struct net *net)
+static const struct nla_policy exts_policy[OVS_VXLAN_EXT_MAX + 1] = {
+ [OVS_VXLAN_EXT_GBP] = { .type = NLA_FLAG, },
+};
+
+static int vxlan_configure_exts(struct vport *vport, struct nlattr *attr,
+ struct vxlan_config *conf)
{
+ struct nlattr *exts[OVS_VXLAN_EXT_MAX + 1];
int err;
- struct sockaddr_in sin;
- struct tnl_vport *tnl_vport = tnl_vport_priv(vxlan_port->vport);
-
- err = sock_create_kern(AF_INET, SOCK_DGRAM, 0,
- &vxlan_port->vxlan_rcv_socket);
- if (err)
- goto error;
- /* release net ref. */
- sk_change_net(vxlan_port->vxlan_rcv_socket->sk, net);
+ if (nla_len(attr) < sizeof(struct nlattr))
+ return -EINVAL;
- sin.sin_family = AF_INET;
- sin.sin_addr.s_addr = htonl(INADDR_ANY);
- sin.sin_port = tnl_vport->dst_port;
+ err = nla_parse_nested(exts, OVS_VXLAN_EXT_MAX, attr, exts_policy);
+ if (err < 0)
+ return err;
- err = kernel_bind(vxlan_port->vxlan_rcv_socket, (struct sockaddr *)&sin,
- sizeof(struct sockaddr_in));
- if (err)
- goto error_sock;
-
- udp_sk(vxlan_port->vxlan_rcv_socket->sk)->encap_type = UDP_ENCAP_VXLAN;
- udp_sk(vxlan_port->vxlan_rcv_socket->sk)->encap_rcv = vxlan_rcv;
-
- udp_encap_enable();
+ if (exts[OVS_VXLAN_EXT_GBP])
+ conf->flags |= VXLAN_F_GBP;
return 0;
-
-error_sock:
- sk_release_kernel(vxlan_port->vxlan_rcv_socket->sk);
-error:
- pr_warn("cannot register vxlan protocol handler\n");
- return err;
}
-static void free_port_rcu(struct rcu_head *rcu)
-{
- struct vxlan_port *vxlan_port = container_of(rcu,
- struct vxlan_port, rcu);
-
- kfree(vxlan_port);
-}
-
-static void vxlan_tunnel_release(struct vxlan_port *vxlan_port)
-{
- if (!vxlan_port)
- return;
-
- list_del_rcu(&vxlan_port->list);
- /* Release socket */
- sk_release_kernel(vxlan_port->vxlan_rcv_socket->sk);
- call_rcu(&vxlan_port->rcu, free_port_rcu);
-}
-
-static int vxlan_tunnel_setup(struct net *net, struct vport *vport,
- struct nlattr *options)
+static struct vport *vxlan_tnl_create(const struct vport_parms *parms)
{
- struct vxlan_port *vxlan_port;
- struct tnl_vport *tnl_vport = tnl_vport_priv(vport);
+ struct net *net = ovs_dp_get_net(parms->dp);
+ struct nlattr *options = parms->options;
+ struct net_device *dev;
+ struct vport *vport;
struct nlattr *a;
int err;
- u16 dst_port;
+ struct vxlan_config conf = {
+ .no_share = true,
+ .flags = VXLAN_F_COLLECT_METADATA,
+ /* Don't restrict the packets that can be sent by MTU */
+ .mtu = IP_MAX_MTU,
+ };
if (!options) {
err = -EINVAL;
- goto out;
+ goto error;
}
a = nla_find_nested(options, OVS_TUNNEL_ATTR_DST_PORT);
if (a && nla_len(a) == sizeof(u16)) {
- dst_port = nla_get_u16(a);
+ conf.dst_port = htons(nla_get_u16(a));
} else {
/* Require destination port from userspace. */
err = -EINVAL;
- goto out;
+ goto error;
}
- /* Verify if we already have a socket created for this port */
- vxlan_port = vxlan_find_port(net, htons(dst_port));
- if (vxlan_port) {
- err = -EEXIST;
- goto out;
+ vport = ovs_vport_alloc(0, &ovs_vxlan_netdev_vport_ops, parms);
+ if (IS_ERR(vport))
+ return vport;
+
+ a = nla_find_nested(options, OVS_TUNNEL_ATTR_EXTENSION);
+ if (a) {
+ err = vxlan_configure_exts(vport, a, &conf);
+ if (err) {
+ ovs_vport_free(vport);
+ goto error;
+ }
}
- /* Add a new socket for this port */
- vxlan_port = kzalloc(sizeof(struct vxlan_port), GFP_KERNEL);
- if (!vxlan_port) {
- err = -ENOMEM;
- goto out;
+ rtnl_lock();
+ dev = vxlan_dev_create(net, parms->name, NET_NAME_USER, &conf);
+ if (IS_ERR(dev)) {
+ rtnl_unlock();
+ ovs_vport_free(vport);
+ return ERR_CAST(dev);
}
- tnl_vport->dst_port = htons(dst_port);
- vxlan_port->vport = vport;
- list_add_tail_rcu(&vxlan_port->list, &vxlan_ports);
+ dev_change_flags(dev, dev->flags | IFF_UP);
+ rtnl_unlock();
+ return vport;
+error:
+ return ERR_PTR(err);
+}
- err = vxlan_socket_init(vxlan_port, net);
- if (err)
- goto error;
+static struct vport *vxlan_create(const struct vport_parms *parms)
+{
+ struct vport *vport;
- return 0;
+ vport = vxlan_tnl_create(parms);
+ if (IS_ERR(vport))
+ return vport;
-error:
- list_del_rcu(&vxlan_port->list);
- kfree(vxlan_port);
-out:
- return err;
+ return ovs_netdev_link(vport, parms->name);
}
-static int vxlan_get_options(const struct vport *vport, struct sk_buff *skb)
+static int vxlan_get_egress_tun_info(struct vport *vport, struct sk_buff *skb,
+ struct dp_upcall_info *upcall)
{
- const struct tnl_vport *tnl_vport = tnl_vport_priv(vport);
-
- if (nla_put_u16(skb, OVS_TUNNEL_ATTR_DST_PORT, ntohs(tnl_vport->dst_port)))
- return -EMSGSIZE;
- return 0;
+ struct vxlan_dev *vxlan = netdev_priv(vport->dev);
+ struct net *net = ovs_dp_get_net(vport->dp);
+ __be16 dst_port = vxlan_dev_dst_port(vxlan);
+ __be16 src_port;
+ int port_min;
+ int port_max;
+
+ inet_get_local_port_range(net, &port_min, &port_max);
+ src_port = udp_flow_src_port(net, skb, 0, 0, true);
+
+ return ovs_tunnel_get_egress_info(upcall, net,
+ skb, IPPROTO_UDP,
+ src_port, dst_port);
}
-static const struct tnl_ops ovs_vxlan_tnl_ops = {
- .ipproto = IPPROTO_UDP,
- .hdr_len = vxlan_hdr_len,
- .build_header = vxlan_build_header,
+static struct vport_ops ovs_vxlan_netdev_vport_ops = {
+ .type = OVS_VPORT_TYPE_VXLAN,
+ .create = vxlan_create,
+ .destroy = ovs_netdev_tunnel_destroy,
+ .get_options = vxlan_get_options,
+ .send = vxlan_xmit,
+ .get_egress_tun_info = vxlan_get_egress_tun_info,
};
-static void vxlan_tnl_destroy(struct vport *vport)
+static int __init ovs_vxlan_tnl_init(void)
{
- struct vxlan_port *vxlan_port;
- struct tnl_vport *tnl_vport = tnl_vport_priv(vport);
-
- vxlan_port = vxlan_find_port(ovs_dp_get_net(vport->dp),
- tnl_vport->dst_port);
-
- vxlan_tunnel_release(vxlan_port);
- ovs_tnl_destroy(vport);
+ return ovs_vport_ops_register(&ovs_vxlan_netdev_vport_ops);
}
-static struct vport *vxlan_tnl_create(const struct vport_parms *parms)
+static void __exit ovs_vxlan_tnl_exit(void)
{
- int err;
- struct vport *vport;
-
- vport = ovs_tnl_create(parms, &ovs_vxlan_vport_ops, &ovs_vxlan_tnl_ops);
- if (IS_ERR(vport))
- return vport;
-
- err = vxlan_tunnel_setup(ovs_dp_get_net(parms->dp), vport,
- parms->options);
- if (err) {
- ovs_tnl_destroy(vport);
- return ERR_PTR(err);
- }
-
- return vport;
+ ovs_vport_ops_unregister(&ovs_vxlan_netdev_vport_ops);
}
-const struct vport_ops ovs_vxlan_vport_ops = {
- .type = OVS_VPORT_TYPE_VXLAN,
- .flags = VPORT_F_TUN_ID,
- .create = vxlan_tnl_create,
- .destroy = vxlan_tnl_destroy,
- .get_name = ovs_tnl_get_name,
- .get_options = vxlan_get_options,
- .send = ovs_tnl_send,
-};
-#else
-#warning VXLAN tunneling will not be available on kernels before 2.6.26
-#endif /* Linux kernel < 2.6.26 */
+module_init(ovs_vxlan_tnl_init);
+module_exit(ovs_vxlan_tnl_exit);
+
+MODULE_DESCRIPTION("OVS: VXLAN switching port");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("vport-type-4");
projects / cascardo / ovs.git / blobdiff