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
  66     memset(config, 0, sizeof *config);
  67
  68     config->flags |= TNL_F_PMTUD;
  69     config->flags |= TNL_F_HDR_CACHE;
  70
  71     SHASH_FOR_EACH (node, args) {
  72         if (!strcmp(node->name, "remote_ip")) {
  73             struct in_addr in_addr;
  74             if (lookup_ip(node->data, &in_addr)) {
  75                 VLOG_WARN("%s: bad %s 'remote_ip'", name, type);
  76             } else {
  77                 config->daddr = in_addr.s_addr;
  78             }
  79         } else if (!strcmp(node->name, "local_ip")) {
  80             struct in_addr in_addr;
  81             if (lookup_ip(node->data, &in_addr)) {
  82                 VLOG_WARN("%s: bad %s 'local_ip'", name, type);
  83             } else {
  84                 config->saddr = in_addr.s_addr;
  85             }
  86         } else if (!strcmp(node->name, "key") && !strcmp(type, "gre")) {
  87             if (!strcmp(node->data, "flow")) {
  88                 config->flags |= TNL_F_IN_KEY_MATCH;
  89                 config->flags |= TNL_F_OUT_KEY_ACTION;
  90             } else {
  91                 config->out_key = config->in_key = htonl(atoi(node->data));
  92             }
  93         } else if (!strcmp(node->name, "in_key") && !strcmp(type, "gre")) {
  94             if (!strcmp(node->data, "flow")) {
  95                 config->flags |= TNL_F_IN_KEY_MATCH;
  96             } else {
  97                 config->in_key = htonl(atoi(node->data));
  98             }
  99         } else if (!strcmp(node->name, "out_key") && !strcmp(type, "gre")) {
 100             if (!strcmp(node->data, "flow")) {
 101                 config->flags |= TNL_F_OUT_KEY_ACTION;
 102             } else {
 103                 config->out_key = htonl(atoi(node->data));
 104             }
 105         } else if (!strcmp(node->name, "tos")) {
 106             if (!strcmp(node->data, "inherit")) {
 107                 config->flags |= TNL_F_TOS_INHERIT;
 108             } else {
 109                 config->tos = atoi(node->data);
 110             }
 111         } else if (!strcmp(node->name, "ttl")) {
 112             if (!strcmp(node->data, "inherit")) {
 113                 config->flags |= TNL_F_TTL_INHERIT;
 114             } else {
 115                 config->ttl = atoi(node->data);
 116             }
 117         } else if (!strcmp(node->name, "csum") && !strcmp(type, "gre")) {
 118             if (!strcmp(node->data, "true")) {
 119                 config->flags |= TNL_F_CSUM;
 120             }
 121         } else if (!strcmp(node->name, "pmtud")) {
 122             if (!strcmp(node->data, "false")) {
 123                 config->flags &= ~TNL_F_PMTUD;
 124             }
 125         } else if (!strcmp(node->name, "header_cache")) {
 126             if (!strcmp(node->data, "false")) {
 127                 config->flags &= ~TNL_F_HDR_CACHE;
 128             }
 129         } else {
 130             VLOG_WARN("%s: unknown %s argument '%s'", name, type, node->name);
 131         }
 132     }
 133
 134     if (!config->daddr) {
 135         VLOG_WARN("%s: %s type requires valid 'remote_ip' argument", name, type);
 136         return EINVAL;
 137     }
 138
 139     return 0;
 140 }
 141
 142 static int
 143 netdev_tunnel_create(const char *name, const char *type,
 144                      const struct shash *args, struct netdev_dev **netdev_devp)
 145 {
 146     int err;
 147     struct odp_vport_add ova;
 148     struct tnl_port_config port_config;
 149     struct netdev_dev_tunnel *netdev_dev;
 150
 151     ovs_strlcpy(ova.port_type, type, sizeof ova.port_type);
 152     ovs_strlcpy(ova.devname, name, sizeof ova.devname);
 153     ova.config = &port_config;
 154
 155     err = parse_config(name, type, args, &port_config);
 156     if (err) {
 157         return err;
 158     }
 159
 160     err = netdev_vport_do_ioctl(ODP_VPORT_ADD, &ova);
 161     if (err == EBUSY) {
 162         VLOG_WARN("%s: destroying existing device", name);
 163
 164         err = netdev_vport_do_ioctl(ODP_VPORT_DEL, ova.devname);
 165         if (err) {
 166             return err;
 167         }
 168
 169         err = netdev_vport_do_ioctl(ODP_VPORT_ADD, &ova);
 170     }
 171
 172     if (err) {
 173         return err;
 174     }
 175
 176     netdev_dev = xmalloc(sizeof *netdev_dev);
 177
 178     if (!strcmp(type, "gre")) {
 179         netdev_dev_init(&netdev_dev->netdev_dev, name, &netdev_gre_class);
 180     } else {
 181         netdev_dev_init(&netdev_dev->netdev_dev, name, &netdev_capwap_class);
 182     }
 183
 184     *netdev_devp = &netdev_dev->netdev_dev;
 185     return 0;
 186 }
 187
 188 static int
 189 netdev_tunnel_reconfigure(struct netdev_dev *netdev_dev_, const struct shash *args)
 190 {
 191     const char *name = netdev_dev_get_name(netdev_dev_);
 192     struct odp_vport_mod ovm;
 193     struct tnl_port_config port_config;
 194     int err;
 195
 196     ovs_strlcpy(ovm.devname, name, sizeof ovm.devname);
 197     ovm.config = &port_config;
 198
 199     err = parse_config(name, netdev_dev_get_class(netdev_dev_)->type, args,
 200                        &port_config);
 201     if (err) {
 202         return err;
 203     }
 204
 205     return netdev_vport_do_ioctl(ODP_VPORT_MOD, &ovm);
 206 }
 207
 208 static void
 209 netdev_tunnel_destroy(struct netdev_dev *netdev_dev_)
 210 {
 211     struct netdev_dev_tunnel *netdev_dev = netdev_dev_tunnel_cast(netdev_dev_);
 212
 213     netdev_vport_do_ioctl(ODP_VPORT_DEL, (char *)netdev_dev_get_name(netdev_dev_));
 214     free(netdev_dev);
 215 }
 216
 217 static int
 218 netdev_tunnel_open(struct netdev_dev *netdev_dev_, int ethertype OVS_UNUSED,
 219                 struct netdev **netdevp)
 220 {
 221     struct netdev_tunnel *netdev;
 222
 223     netdev = xmalloc(sizeof *netdev);
 224     netdev_init(&netdev->netdev, netdev_dev_);
 225
 226     *netdevp = &netdev->netdev;
 227     return 0;
 228 }
 229
 230 static void
 231 netdev_tunnel_close(struct netdev *netdev_)
 232 {
 233     struct netdev_tunnel *netdev = netdev_tunnel_cast(netdev_);
 234     free(netdev);
 235 }
 236
 237 const struct netdev_class netdev_gre_class = {
 238     "gre",
 239
 240     NULL,                       /* init */
 241     NULL,                       /* run */
 242     NULL,                       /* wait */
 243
 244     netdev_tunnel_create,
 245     netdev_tunnel_destroy,
 246     netdev_tunnel_reconfigure,
 247
 248     netdev_tunnel_open,
 249     netdev_tunnel_close,
 250
 251     NULL,                       /* enumerate */
 252
 253     NULL,                       /* recv */
 254     NULL,                       /* recv_wait */
 255     NULL,                       /* drain */
 256
 257     NULL,                       /* send */
 258     NULL,                       /* send_wait */
 259
 260     netdev_vport_set_etheraddr,
 261     netdev_vport_get_etheraddr,
 262     netdev_vport_get_mtu,
 263     NULL,                       /* get_ifindex */
 264     netdev_vport_get_carrier,
 265     netdev_vport_get_stats,
 266     netdev_vport_set_stats,
 267
 268     NULL,                       /* get_features */
 269     NULL,                       /* set_advertisements */
 270     NULL,                       /* get_vlan_vid */
 271
 272     NULL,                       /* set_policing */
 273     NULL,                       /* get_qos_types */
 274     NULL,                       /* get_qos_capabilities */
 275     NULL,                       /* get_qos */
 276     NULL,                       /* set_qos */
 277     NULL,                       /* get_queue */
 278     NULL,                       /* set_queue */
 279     NULL,                       /* delete_queue */
 280     NULL,                       /* get_queue_stats */
 281     NULL,                       /* dump_queues */
 282     NULL,                       /* dump_queue_stats */
 283
 284     NULL,                       /* get_in4 */
 285     NULL,                       /* set_in4 */
 286     NULL,                       /* get_in6 */
 287     NULL,                       /* add_router */
 288     NULL,                       /* get_next_hop */
 289     NULL,                       /* arp_lookup */
 290
 291     netdev_vport_update_flags,
 292
 293     netdev_vport_poll_add,
 294     netdev_vport_poll_remove,
 295 };
 296
 297 const struct netdev_class netdev_capwap_class = {
 298     "capwap",
 299
 300     NULL,                       /* init */
 301     NULL,                       /* run */
 302     NULL,                       /* wait */
 303
 304     netdev_tunnel_create,
 305     netdev_tunnel_destroy,
 306     netdev_tunnel_reconfigure,
 307
 308     netdev_tunnel_open,
 309     netdev_tunnel_close,
 310
 311     NULL,                       /* enumerate */
 312
 313     NULL,                       /* recv */
 314     NULL,                       /* recv_wait */
 315     NULL,                       /* drain */
 316
 317     NULL,                       /* send */
 318     NULL,                       /* send_wait */
 319
 320     netdev_vport_set_etheraddr,
 321     netdev_vport_get_etheraddr,
 322     netdev_vport_get_mtu,
 323     NULL,                       /* get_ifindex */
 324     netdev_vport_get_carrier,
 325     netdev_vport_get_stats,
 326     netdev_vport_set_stats,
 327
 328     NULL,                       /* get_features */
 329     NULL,                       /* set_advertisements */
 330     NULL,                       /* get_vlan_vid */
 331
 332     NULL,                       /* set_policing */
 333     NULL,                       /* get_qos_types */
 334     NULL,                       /* get_qos_capabilities */
 335     NULL,                       /* get_qos */
 336     NULL,                       /* set_qos */
 337     NULL,                       /* get_queue */
 338     NULL,                       /* set_queue */
 339     NULL,                       /* delete_queue */
 340     NULL,                       /* get_queue_stats */
 341     NULL,                       /* dump_queues */
 342     NULL,                       /* dump_queue_stats */
 343
 344     NULL,                       /* get_in4 */
 345     NULL,                       /* set_in4 */
 346     NULL,                       /* get_in6 */
 347     NULL,                       /* add_router */
 348     NULL,                       /* get_next_hop */
 349     NULL,                       /* arp_lookup */
 350
 351     netdev_vport_update_flags,
 352
 353     netdev_vport_poll_add,
 354     netdev_vport_poll_remove,
 355 };