/*
- * Copyright (c) 2011 Nicira, Inc.
- * Copyright (c) 2013 Cisco Systems, Inc.
+ * Copyright (c) 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
- * 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
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
*/
#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/list.h>
#include <linux/net.h>
+#include <linux/rculist.h>
#include <linux/udp.h>
+#include <linux/if_vlan.h>
+#include <linux/module.h>
+#include <net/lisp.h>
#include <net/icmp.h>
#include <net/ip.h>
+#include <net/route.h>
#include <net/udp.h>
+#include <net/xfrm.h>
#include "datapath.h"
-#include "tunnel.h"
#include "vport.h"
+#include "vport-netdev.h"
-
-/*
- * LISP encapsulation header:
- *
- * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
- * |N|L|E|V|I|flags| Nonce/Map-Version |
- * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
- * | Instance ID/Locator Status Bits |
- * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
- *
- */
-
-/**
- * struct lisphdr - LISP header
- * @nonce_present: Flag indicating the presence of a 24 bit nonce value.
- * @locator_status_bits_present: Flag indicating the presence of Locator Status
- * Bits (LSB).
- * @solicit_echo_nonce: Flag indicating the use of the echo noncing mechanism.
- * @map_version_present: Flag indicating the use of mapping versioning.
- * @instance_id_present: Flag indicating the presence of a 24 bit Instance ID.
- * @reserved_flags: 3 bits reserved for future flags.
- * @nonce: 24 bit nonce value.
- * @map_version: 24 bit mapping version.
- * @locator_status_bits: Locator Status Bits: 32 bits when instance_id_present
- * is not set, 8 bits when it is.
- * @instance_id: 24 bit Instance ID
- */
-struct lisphdr {
-#ifdef __LITTLE_ENDIAN_BITFIELD
- __u8 reserved_flags:3;
- __u8 instance_id_present:1;
- __u8 map_version_present:1;
- __u8 solicit_echo_nonce:1;
- __u8 locator_status_bits_present:1;
- __u8 nonce_present:1;
-#else
- __u8 nonce_present:1;
- __u8 locator_status_bits_present:1;
- __u8 solicit_echo_nonce:1;
- __u8 map_version_present:1;
- __u8 instance_id_present:1;
- __u8 reserved_flags:3;
-#endif
- union {
- __u8 nonce[3];
- __u8 map_version[3];
- } u1;
- union {
- __be32 locator_status_bits;
- struct {
- __u8 instance_id[3];
- __u8 locator_status_bits;
- } word2;
- } u2;
-};
-
-#define LISP_HLEN (sizeof(struct udphdr) + sizeof(struct lisphdr))
-
-static inline int lisp_hdr_len(const struct tnl_mutable_config *mutable,
- const struct ovs_key_ipv4_tunnel *tun_key)
-{
- return LISP_HLEN;
-}
-
+static struct vport_ops ovs_lisp_vport_ops;
/**
* struct lisp_port - Keeps track of open UDP ports
- * @list: list element.
- * @port: The UDP port number in network byte order.
- * @socket: The socket created for this port number.
- * @count: How many ports are using this socket/port.
+ * @dst_port: destination port.
*/
struct lisp_port {
- struct list_head list;
- __be16 port;
- struct socket *lisp_rcv_socket;
- int count;
+ u16 port_no;
};
-static LIST_HEAD(lisp_ports);
-
-static struct lisp_port *lisp_port_exists(struct net *net, __be16 port)
+static inline struct lisp_port *lisp_vport(const struct vport *vport)
{
- struct lisp_port *lisp_port;
-
- list_for_each_entry(lisp_port, &lisp_ports, list) {
- if (lisp_port->port == port &&
- net_eq(sock_net(lisp_port->lisp_rcv_socket->sk), net))
- return lisp_port;
- }
-
- return NULL;
-}
-
-static inline struct lisphdr *lisp_hdr(const struct sk_buff *skb)
-{
- return (struct lisphdr *)(udp_hdr(skb) + 1);
-}
-
-static int lisp_tnl_send(struct vport *vport, struct sk_buff *skb)
-{
- int tnl_len;
- int network_offset = skb_network_offset(skb);
-
- /* We only encapsulate IPv4 and IPv6 packets */
- switch (skb->protocol) {
- case htons(ETH_P_IP):
- case htons(ETH_P_IPV6):
- /* Pop off "inner" Ethernet header */
- skb_pull(skb, network_offset);
- tnl_len = ovs_tnl_send(vport, skb);
- return tnl_len > 0 ? tnl_len + network_offset : tnl_len;
- default:
- kfree_skb(skb);
- return 0;
- }
-}
-
-/* Convert 64 bit tunnel ID to 24 bit Instance ID. */
-static void tunnel_id_to_instance_id(__be64 tun_id, __u8 *iid)
-{
-
-#ifdef __BIG_ENDIAN
- iid[0] = (__force __u8)(tun_id >> 16);
- iid[1] = (__force __u8)(tun_id >> 8);
- iid[2] = (__force __u8)tun_id;
-#else
- iid[0] = (__force __u8)((__force u64)tun_id >> 40);
- iid[1] = (__force __u8)((__force u64)tun_id >> 48);
- iid[2] = (__force __u8)((__force u64)tun_id >> 56);
-#endif
-}
-
-/* Convert 24 bit Instance ID to 64 bit tunnel ID. */
-static __be64 instance_id_to_tunnel_id(__u8 *iid)
-{
-#ifdef __BIG_ENDIAN
- return (iid[0] << 16) | (iid[1] << 8) | iid[2];
-#else
- return (__force __be64)(((__force u64)iid[0] << 40) |
- ((__force u64)iid[1] << 48) |
- ((__force u64)iid[2] << 56));
-#endif
-}
-
-static struct sk_buff *lisp_build_header(const struct vport *vport,
- const struct tnl_mutable_config *mutable,
- struct dst_entry *dst,
- struct sk_buff *skb,
- int tunnel_hlen)
-{
- struct udphdr *udph = udp_hdr(skb);
- struct lisphdr *lisph = (struct lisphdr *)(udph + 1);
- const struct ovs_key_ipv4_tunnel *tun_key = OVS_CB(skb)->tun_key;
- __be64 out_key;
- u32 flags;
-
- tnl_get_param(mutable, tun_key, &flags, &out_key);
-
- udph->dest = mutable->dst_port;
- udph->source = htons(ovs_tnl_get_src_port(skb));
- udph->check = 0;
- udph->len = htons(skb->len - skb_transport_offset(skb));
-
- lisph->nonce_present = 0; /* We don't support echo nonce algorithm */
- lisph->locator_status_bits_present = 1; /* Set LSB */
- lisph->solicit_echo_nonce = 0; /* No echo noncing */
- lisph->map_version_present = 0; /* No mapping versioning, nonce instead */
- lisph->instance_id_present = 1; /* Store the tun_id as Instance ID */
- lisph->reserved_flags = 0; /* Reserved flags, set to 0 */
-
- lisph->u1.nonce[0] = 0;
- lisph->u1.nonce[1] = 0;
- lisph->u1.nonce[2] = 0;
-
- tunnel_id_to_instance_id(out_key, &lisph->u2.word2.instance_id[0]);
- lisph->u2.word2.locator_status_bits = 1;
-
- /*
- * 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), dst, 0);
-
- return skb;
-}
-
-/* Called with rcu_read_lock and BH disabled. */
-static int lisp_rcv(struct sock *sk, struct sk_buff *skb)
-{
- struct vport *vport;
- struct lisphdr *lisph;
- const struct tnl_mutable_config *mutable;
- struct iphdr *iph, *inner_iph;
- struct ovs_key_ipv4_tunnel tun_key;
- __be64 key;
- u32 tunnel_flags = 0;
- struct ethhdr *ethh;
- __be16 protocol;
-
- if (unlikely(!pskb_may_pull(skb, LISP_HLEN)))
- goto error;
-
- lisph = lisp_hdr(skb);
-
- skb_pull_rcsum(skb, LISP_HLEN);
-
- if (lisph->instance_id_present != 1)
- key = 0;
- else
- key = instance_id_to_tunnel_id(&lisph->u2.word2.instance_id[0]);
-
- iph = ip_hdr(skb);
- vport = ovs_tnl_find_port(dev_net(skb->dev), iph->daddr, iph->saddr,
- key, TNL_T_PROTO_LISP, &mutable);
- if (unlikely(!vport))
- goto error;
-
- if (mutable->flags & TNL_F_IN_KEY_MATCH || !mutable->key.daddr)
- tunnel_flags = OVS_TNL_F_KEY;
- else
- key = 0;
-
- /* Save outer tunnel values */
- tnl_tun_key_init(&tun_key, iph, key, tunnel_flags);
- OVS_CB(skb)->tun_key = &tun_key;
-
- /* Drop non-IP inner packets */
- inner_iph = (struct iphdr *)(lisph + 1);
- switch (inner_iph->version) {
- case 4:
- protocol = htons(ETH_P_IP);
- break;
- case 6:
- protocol = htons(ETH_P_IPV6);
- break;
- default:
- goto error;
- }
-
- /* Add Ethernet header */
- ethh = (struct ethhdr *)skb_push(skb, ETH_HLEN);
- memset(ethh, 0, ETH_HLEN);
- ethh->h_dest[0] = 0x02;
- ethh->h_source[0] = 0x02;
- ethh->h_proto = protocol;
-
- ovs_tnl_rcv(vport, skb);
- goto out;
-
-error:
- kfree_skb(skb);
-out:
- return 0;
+ return vport_priv(vport);
}
-/* Arbitrary value. Irrelevant as long as it's not 0 since we set the handler. */
-#define UDP_ENCAP_LISP 1
-static int lisp_socket_init(struct lisp_port *lisp_port, struct net *net)
+static int lisp_get_options(const struct vport *vport,
+ struct sk_buff *skb)
{
- int err;
- struct sockaddr_in sin;
-
- err = sock_create_kern(AF_INET, SOCK_DGRAM, 0,
- &lisp_port->lisp_rcv_socket);
- if (err)
- goto error;
-
- /* release net ref. */
- sk_change_net(lisp_port->lisp_rcv_socket->sk, net);
-
- sin.sin_family = AF_INET;
- sin.sin_addr.s_addr = htonl(INADDR_ANY);
- sin.sin_port = lisp_port->port;
-
- err = kernel_bind(lisp_port->lisp_rcv_socket, (struct sockaddr *)&sin,
- sizeof(struct sockaddr_in));
- if (err)
- goto error_sock;
-
- udp_sk(lisp_port->lisp_rcv_socket->sk)->encap_type = UDP_ENCAP_LISP;
- udp_sk(lisp_port->lisp_rcv_socket->sk)->encap_rcv = lisp_rcv;
-
- udp_encap_enable();
+ struct lisp_port *lisp_port = lisp_vport(vport);
+ if (nla_put_u16(skb, OVS_TUNNEL_ATTR_DST_PORT, lisp_port->port_no))
+ return -EMSGSIZE;
return 0;
-
-error_sock:
- sk_release_kernel(lisp_port->lisp_rcv_socket->sk);
-error:
- pr_warn("cannot register lisp protocol handler: %d\n", err);
- return err;
}
-static void lisp_tunnel_release(struct lisp_port *lisp_port)
+static int lisp_get_egress_tun_info(struct vport *vport, struct sk_buff *skb,
+ struct dp_upcall_info *upcall)
{
- lisp_port->count--;
+ struct lisp_port *lisp_port = lisp_vport(vport);
+ struct net *net = ovs_dp_get_net(vport->dp);
+ __be16 dport = htons(lisp_port->port_no);
+ __be16 sport = udp_flow_src_port(net, skb, 1, USHRT_MAX, true);
- if (lisp_port->count == 0) {
- /* Release old socket */
- sk_release_kernel(lisp_port->lisp_rcv_socket->sk);
- list_del(&lisp_port->list);
- kfree(lisp_port);
- }
+ return ovs_tunnel_get_egress_info(upcall, ovs_dp_get_net(vport->dp),
+ skb, IPPROTO_UDP, sport, dport);
}
-static int lisp_tunnel_setup(struct net *net, struct nlattr *options,
- struct lisp_port **lport)
+static struct vport *lisp_tnl_create(const struct vport_parms *parms)
{
+ struct net *net = ovs_dp_get_net(parms->dp);
+ struct nlattr *options = parms->options;
+ struct lisp_port *lisp_port;
+ struct net_device *dev;
+ struct vport *vport;
struct nlattr *a;
- int err;
u16 dst_port;
- struct lisp_port *lisp_port = NULL;
-
- *lport = NULL;
+ int err;
if (!options) {
err = -EINVAL;
- goto out;
+ goto error;
}
a = nla_find_nested(options, OVS_TUNNEL_ATTR_DST_PORT);
} else {
/* Require destination port from userspace. */
err = -EINVAL;
- goto out;
- }
-
- /* Verify if we already have a socket created for this port */
- lisp_port = lisp_port_exists(net, htons(dst_port));
- if (lisp_port) {
- lisp_port->count++;
- err = 0;
- *lport = lisp_port;
- goto out;
- }
-
- /* Add a new socket for this port */
- lisp_port = kzalloc(sizeof(struct lisp_port), GFP_KERNEL);
- if (!lisp_port) {
- err = -ENOMEM;
- goto out;
+ goto error;
}
- lisp_port->port = htons(dst_port);
- lisp_port->count = 1;
- list_add_tail(&lisp_port->list, &lisp_ports);
+ vport = ovs_vport_alloc(sizeof(struct lisp_port),
+ &ovs_lisp_vport_ops, parms);
+ if (IS_ERR(vport))
+ return vport;
- err = lisp_socket_init(lisp_port, net);
- if (err)
- goto error;
+ lisp_port = lisp_vport(vport);
+ lisp_port->port_no = dst_port;
- *lport = lisp_port;
- goto out;
+ rtnl_lock();
+ dev = lisp_dev_create_fb(net, parms->name, NET_NAME_USER, dst_port);
+ if (IS_ERR(dev)) {
+ rtnl_unlock();
+ ovs_vport_free(vport);
+ return ERR_CAST(dev);
+ }
+ dev_change_flags(dev, dev->flags | IFF_UP);
+ rtnl_unlock();
+ return vport;
error:
- list_del(&lisp_port->list);
- kfree(lisp_port);
-out:
- return err;
+ return ERR_PTR(err);
}
-static int lisp_tnl_set_options(struct vport *vport, struct nlattr *options)
+static struct vport *lisp_create(const struct vport_parms *parms)
{
- int err;
- struct net *net = ovs_dp_get_net(vport->dp);
- struct tnl_vport *tnl_vport = tnl_vport_priv(vport);
- struct tnl_mutable_config *config;
- struct lisp_port *old_port = NULL;
- struct lisp_port *lisp_port = NULL;
-
- config = rtnl_dereference(tnl_vport->mutable);
-
- old_port = lisp_port_exists(net, config->dst_port);
-
- err = lisp_tunnel_setup(net, options, &lisp_port);
- if (err)
- goto out;
+ struct vport *vport;
- err = ovs_tnl_set_options(vport, options);
+ vport = lisp_tnl_create(parms);
+ if (IS_ERR(vport))
+ return vport;
- if (err)
- lisp_tunnel_release(lisp_port);
- else {
- /* Release old socket */
- lisp_tunnel_release(old_port);
- }
-out:
- return err;
+ return ovs_netdev_link(vport, parms->name);
}
-static const struct tnl_ops ovs_lisp_tnl_ops = {
- .tunnel_type = TNL_T_PROTO_LISP,
- .ipproto = IPPROTO_UDP,
- .hdr_len = lisp_hdr_len,
- .build_header = lisp_build_header,
+static struct vport_ops ovs_lisp_vport_ops = {
+ .type = OVS_VPORT_TYPE_LISP,
+ .create = lisp_create,
+ .destroy = ovs_netdev_tunnel_destroy,
+ .get_options = lisp_get_options,
+ .send = lisp_xmit,
+ .get_egress_tun_info = lisp_get_egress_tun_info,
};
-static void lisp_tnl_destroy(struct vport *vport)
+static int __init ovs_lisp_tnl_init(void)
{
- struct lisp_port *lisp_port;
- struct tnl_vport *tnl_vport = tnl_vport_priv(vport);
- struct tnl_mutable_config *config;
-
- config = rtnl_dereference(tnl_vport->mutable);
-
- lisp_port = lisp_port_exists(ovs_dp_get_net(vport->dp),
- config->dst_port);
-
- lisp_tunnel_release(lisp_port);
-
- ovs_tnl_destroy(vport);
+ return ovs_vport_ops_register(&ovs_lisp_vport_ops);
}
-static struct vport *lisp_tnl_create(const struct vport_parms *parms)
+static void __exit ovs_lisp_tnl_exit(void)
{
- int err;
- struct vport *vport;
- struct lisp_port *lisp_port = NULL;
-
- err = lisp_tunnel_setup(ovs_dp_get_net(parms->dp), parms->options,
- &lisp_port);
- if (err)
- return ERR_PTR(err);
-
- vport = ovs_tnl_create(parms, &ovs_lisp_vport_ops, &ovs_lisp_tnl_ops);
-
- if (IS_ERR(vport))
- lisp_tunnel_release(lisp_port);
-
- return vport;
+ ovs_vport_ops_unregister(&ovs_lisp_vport_ops);
}
-const struct vport_ops ovs_lisp_vport_ops = {
- .type = OVS_VPORT_TYPE_LISP,
- .flags = VPORT_F_TUN_ID,
- .create = lisp_tnl_create,
- .destroy = lisp_tnl_destroy,
- .get_name = ovs_tnl_get_name,
- .get_options = ovs_tnl_get_options,
- .set_options = lisp_tnl_set_options,
- .send = lisp_tnl_send,
-};
-#else
-#warning LISP tunneling will not be available on kernels before 2.6.26
-#endif /* Linux kernel < 2.6.26 */
+module_init(ovs_lisp_tnl_init);
+module_exit(ovs_lisp_tnl_exit);
+
+MODULE_DESCRIPTION("OVS: Lisp switching port");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("vport-type-105");
projects / cascardo / ovs.git / blobdiff