lib/netdev-tunnel.c

   1 /*
   2  * Copyright (c) 2010 Nicira Networks.
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at:
   7  *
   8  *     http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  */
  16
  17 #include <config.h>
  18 #include <errno.h>
  19 #include <fcntl.h>
  20 #include <net/if.h>
  21 #include <sys/ioctl.h>
  22
  23 #include "netdev-provider.h"
  24 #include "netdev-vport.h"
  25 #include "openflow/openflow.h"
  26 #include "openvswitch/datapath-protocol.h"
  27 #include "openvswitch/tunnel.h"
  28 #include "packets.h"
  29 #include "socket-util.h"
  30 #include "vlog.h"
  31
  32 VLOG_DEFINE_THIS_MODULE(netdev_tunnel)
  33
  34 struct netdev_dev_tunnel {
  35     struct netdev_dev netdev_dev;
  36 };
  37
  38 struct netdev_tunnel {
  39     struct netdev netdev;
  40 };
  41
  42 static int netdev_tunnel_create(const char *name, const char *type,
  43                                 const struct shash *args, struct netdev_dev **);
  44
  45 static struct netdev_dev_tunnel *
  46 netdev_dev_tunnel_cast(const struct netdev_dev *netdev_dev)
  47 {
  48     assert(netdev_dev_get_class(netdev_dev)->create == netdev_tunnel_create);
  49     return CONTAINER_OF(netdev_dev, struct netdev_dev_tunnel, netdev_dev);
  50 }
  51
  52 static struct netdev_tunnel *
  53 netdev_tunnel_cast(const struct netdev *netdev)
  54 {
  55     struct netdev_dev *netdev_dev = netdev_get_dev(netdev);
  56     assert(netdev_dev_get_class(netdev_dev)->create == netdev_tunnel_create);
  57     return CONTAINER_OF(netdev, struct netdev_tunnel, netdev);
  58 }
  59
  60 static int
  61 parse_config(const char *name, const char *type, const struct shash *args,
  62              struct tnl_port_config *config)
  63 {
  64     struct shash_node *node;
  65     bool ipsec_ip_set = false;
  66     bool ipsec_mech_set = false;
  67
  68     memset(config, 0, sizeof *config);
  69
  70     config->flags |= TNL_F_PMTUD;
  71     config->flags |= TNL_F_HDR_CACHE;
  72
  73     SHASH_FOR_EACH (node, args) {
  74         if (!strcmp(node->name, "remote_ip")) {
  75             struct in_addr in_addr;
  76             if (lookup_ip(node->data, &in_addr)) {
  77                 VLOG_WARN("%s: bad %s 'remote_ip'", name, type);
  78             } else {
  79                 config->daddr = in_addr.s_addr;
  80             }
  81         } else if (!strcmp(node->name, "local_ip")) {
  82             struct in_addr in_addr;
  83             if (lookup_ip(node->data, &in_addr)) {
  84                 VLOG_WARN("%s: bad %s 'local_ip'", name, type);
  85             } else {
  86                 config->saddr = in_addr.s_addr;
  87             }
  88         } else if (!strcmp(node->name, "key") && !strcmp(type, "gre")) {
  89             if (!strcmp(node->data, "flow")) {
  90                 config->flags |= TNL_F_IN_KEY_MATCH;
  91                 config->flags |= TNL_F_OUT_KEY_ACTION;
  92             } else {
  93                 config->out_key = config->in_key = htonl(atoi(node->data));
  94             }
  95         } else if (!strcmp(node->name, "in_key") && !strcmp(type, "gre")) {
  96             if (!strcmp(node->data, "flow")) {
  97                 config->flags |= TNL_F_IN_KEY_MATCH;
  98             } else {
  99                 config->in_key = htonl(atoi(node->data));
 100             }
 101         } else if (!strcmp(node->name, "out_key") && !strcmp(type, "gre")) {
 102             if (!strcmp(node->data, "flow")) {
 103                 config->flags |= TNL_F_OUT_KEY_ACTION;
 104             } else {
 105                 config->out_key = htonl(atoi(node->data));
 106             }
 107         } else if (!strcmp(node->name, "tos")) {
 108             if (!strcmp(node->data, "inherit")) {
 109                 config->flags |= TNL_F_TOS_INHERIT;
 110             } else {
 111                 config->tos = atoi(node->data);
 112             }
 113         } else if (!strcmp(node->name, "ttl")) {
 114             if (!strcmp(node->data, "inherit")) {
 115                 config->flags |= TNL_F_TTL_INHERIT;
 116             } else {
 117                 config->ttl = atoi(node->data);
 118             }
 119         } else if (!strcmp(node->name, "csum") && !strcmp(type, "gre")) {
 120             if (!strcmp(node->data, "true")) {
 121                 config->flags |= TNL_F_CSUM;
 122             }
 123         } else if (!strcmp(node->name, "pmtud")) {
 124             if (!strcmp(node->data, "false")) {
 125                 config->flags &= ~TNL_F_PMTUD;
 126             }
 127         } else if (!strcmp(node->name, "header_cache")) {
 128             if (!strcmp(node->data, "false")) {
 129                 config->flags &= ~TNL_F_HDR_CACHE;
 130             }
 131         } else if (!strcmp(node->name, "ipsec_local_ip")) {
 132             ipsec_ip_set = true;
 133         } else if (!strcmp(node->name, "ipsec_cert")
 134                    || !strcmp(node->name, "ipsec_psk")) {
 135             ipsec_mech_set = true;
 136         } else {
 137             VLOG_WARN("%s: unknown %s argument '%s'", name, type, node->name);
 138         }
 139     }
 140
 141     /* IPsec doesn't work when header caching is enabled.  Disable it if
 142      * the IPsec local IP address and authentication mechanism have been
 143      * defined. */
 144     if (ipsec_ip_set && ipsec_mech_set) {
 145         VLOG_INFO("%s: header caching disabled due to use of IPsec", name);
 146         config->flags &= ~TNL_F_HDR_CACHE;
 147     }
 148
 149     if (!config->daddr) {
 150         VLOG_WARN("%s: %s type requires valid 'remote_ip' argument", name, type);
 151         return EINVAL;
 152     }
 153
 154     return 0;
 155 }
 156
 157 static int
 158 netdev_tunnel_create(const char *name, const char *type,
 159                      const struct shash *args, struct netdev_dev **netdev_devp)
 160 {
 161     int err;
 162     struct odp_vport_add ova;
 163     struct tnl_port_config port_config;
 164     struct netdev_dev_tunnel *netdev_dev;
 165
 166     ovs_strlcpy(ova.port_type, type, sizeof ova.port_type);
 167     ovs_strlcpy(ova.devname, name, sizeof ova.devname);
 168     ova.config = &port_config;
 169
 170     err = parse_config(name, type, args, &port_config);
 171     if (err) {
 172         return err;
 173     }
 174
 175     err = netdev_vport_do_ioctl(ODP_VPORT_ADD, &ova);
 176     if (err == EBUSY) {
 177         VLOG_WARN("%s: destroying existing device", name);
 178
 179         err = netdev_vport_do_ioctl(ODP_VPORT_DEL, ova.devname);
 180         if (err) {
 181             return err;
 182         }
 183
 184         err = netdev_vport_do_ioctl(ODP_VPORT_ADD, &ova);
 185     }
 186
 187     if (err) {
 188         return err;
 189     }
 190
 191     netdev_dev = xmalloc(sizeof *netdev_dev);
 192
 193     if (!strcmp(type, "gre")) {
 194         netdev_dev_init(&netdev_dev->netdev_dev, name, &netdev_gre_class);
 195     } else {
 196         netdev_dev_init(&netdev_dev->netdev_dev, name, &netdev_capwap_class);
 197     }
 198
 199     *netdev_devp = &netdev_dev->netdev_dev;
 200     return 0;
 201 }
 202
 203 static int
 204 netdev_tunnel_reconfigure(struct netdev_dev *netdev_dev_, const struct shash *args)
 205 {
 206     const char *name = netdev_dev_get_name(netdev_dev_);
 207     struct odp_vport_mod ovm;
 208     struct tnl_port_config port_config;
 209     int err;
 210
 211     ovs_strlcpy(ovm.devname, name, sizeof ovm.devname);
 212     ovm.config = &port_config;
 213
 214     err = parse_config(name, netdev_dev_get_class(netdev_dev_)->type, args,
 215                        &port_config);
 216     if (err) {
 217         return err;
 218     }
 219
 220     return netdev_vport_do_ioctl(ODP_VPORT_MOD, &ovm);
 221 }
 222
 223 static void
 224 netdev_tunnel_destroy(struct netdev_dev *netdev_dev_)
 225 {
 226     struct netdev_dev_tunnel *netdev_dev = netdev_dev_tunnel_cast(netdev_dev_);
 227
 228     netdev_vport_do_ioctl(ODP_VPORT_DEL, (char *)netdev_dev_get_name(netdev_dev_));
 229     free(netdev_dev);
 230 }
 231
 232 static int
 233 netdev_tunnel_open(struct netdev_dev *netdev_dev_, int ethertype OVS_UNUSED,
 234                 struct netdev **netdevp)
 235 {
 236     struct netdev_tunnel *netdev;
 237
 238     netdev = xmalloc(sizeof *netdev);
 239     netdev_init(&netdev->netdev, netdev_dev_);
 240
 241     *netdevp = &netdev->netdev;
 242     return 0;
 243 }
 244
 245 static void
 246 netdev_tunnel_close(struct netdev *netdev_)
 247 {
 248     struct netdev_tunnel *netdev = netdev_tunnel_cast(netdev_);
 249     free(netdev);
 250 }
 251
 252 const struct netdev_class netdev_gre_class = {
 253     "gre",
 254
 255     NULL,                       /* init */
 256     NULL,                       /* run */
 257     NULL,                       /* wait */
 258
 259     netdev_tunnel_create,
 260     netdev_tunnel_destroy,
 261     netdev_tunnel_reconfigure,
 262
 263     netdev_tunnel_open,
 264     netdev_tunnel_close,
 265
 266     NULL,                       /* enumerate */
 267
 268     NULL,                       /* recv */
 269     NULL,                       /* recv_wait */
 270     NULL,                       /* drain */
 271
 272     NULL,                       /* send */
 273     NULL,                       /* send_wait */
 274
 275     netdev_vport_set_etheraddr,
 276     netdev_vport_get_etheraddr,
 277     netdev_vport_get_mtu,
 278     NULL,                       /* get_ifindex */
 279     netdev_vport_get_carrier,
 280     netdev_vport_get_stats,
 281     netdev_vport_set_stats,
 282
 283     NULL,                       /* get_features */
 284     NULL,                       /* set_advertisements */
 285     NULL,                       /* get_vlan_vid */
 286
 287     NULL,                       /* set_policing */
 288     NULL,                       /* get_qos_types */
 289     NULL,                       /* get_qos_capabilities */
 290     NULL,                       /* get_qos */
 291     NULL,                       /* set_qos */
 292     NULL,                       /* get_queue */
 293     NULL,                       /* set_queue */
 294     NULL,                       /* delete_queue */
 295     NULL,                       /* get_queue_stats */
 296     NULL,                       /* dump_queues */
 297     NULL,                       /* dump_queue_stats */
 298
 299     NULL,                       /* get_in4 */
 300     NULL,                       /* set_in4 */
 301     NULL,                       /* get_in6 */
 302     NULL,                       /* add_router */
 303     NULL,                       /* get_next_hop */
 304     NULL,                       /* arp_lookup */
 305
 306     netdev_vport_update_flags,
 307
 308     netdev_vport_poll_add,
 309     netdev_vport_poll_remove,
 310 };
 311
 312 const struct netdev_class netdev_capwap_class = {
 313     "capwap",
 314
 315     NULL,                       /* init */
 316     NULL,                       /* run */
 317     NULL,                       /* wait */
 318
 319     netdev_tunnel_create,
 320     netdev_tunnel_destroy,
 321     netdev_tunnel_reconfigure,
 322
 323     netdev_tunnel_open,
 324     netdev_tunnel_close,
 325
 326     NULL,                       /* enumerate */
 327
 328     NULL,                       /* recv */
 329     NULL,                       /* recv_wait */
 330     NULL,                       /* drain */
 331
 332     NULL,                       /* send */
 333     NULL,                       /* send_wait */
 334
 335     netdev_vport_set_etheraddr,
 336     netdev_vport_get_etheraddr,
 337     netdev_vport_get_mtu,
 338     NULL,                       /* get_ifindex */
 339     netdev_vport_get_carrier,
 340     netdev_vport_get_stats,
 341     netdev_vport_set_stats,
 342
 343     NULL,                       /* get_features */
 344     NULL,                       /* set_advertisements */
 345     NULL,                       /* get_vlan_vid */
 346
 347     NULL,                       /* set_policing */
 348     NULL,                       /* get_qos_types */
 349     NULL,                       /* get_qos_capabilities */
 350     NULL,                       /* get_qos */
 351     NULL,                       /* set_qos */
 352     NULL,                       /* get_queue */
 353     NULL,                       /* set_queue */
 354     NULL,                       /* delete_queue */
 355     NULL,                       /* get_queue_stats */
 356     NULL,                       /* dump_queues */
 357     NULL,                       /* dump_queue_stats */
 358
 359     NULL,                       /* get_in4 */
 360     NULL,                       /* set_in4 */
 361     NULL,                       /* get_in6 */
 362     NULL,                       /* add_router */
 363     NULL,                       /* get_next_hop */
 364     NULL,                       /* arp_lookup */
 365
 366     netdev_vport_update_flags,
 367
 368     netdev_vport_poll_add,
 369     netdev_vport_poll_remove,
 370 };