lib/netdev-dummy.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
  19 #include "dummy.h"
  20
  21 #include <errno.h>
  22
  23 #include "list.h"
  24 #include "netdev-provider.h"
  25 #include "packets.h"
  26 #include "shash.h"
  27 #include "vlog.h"
  28
  29 VLOG_DEFINE_THIS_MODULE(netdev_dummy);
  30
  31 struct netdev_dummy_notifier {
  32     struct netdev_notifier notifier;
  33     struct list list_node;
  34     struct shash_node *shash_node;
  35 };
  36
  37 struct netdev_dev_dummy {
  38     struct netdev_dev netdev_dev;
  39     uint8_t hwaddr[ETH_ADDR_LEN];
  40     int mtu;
  41     struct netdev_stats stats;
  42     enum netdev_flags flags;
  43 };
  44
  45 struct netdev_dummy {
  46     struct netdev netdev;
  47 };
  48
  49 static struct shash netdev_dummy_notifiers =
  50     SHASH_INITIALIZER(&netdev_dummy_notifiers);
  51
  52 static int netdev_dummy_create(const struct netdev_class *, const char *,
  53                                const struct shash *, struct netdev_dev **);
  54 static void netdev_dummy_poll_notify(const struct netdev *);
  55
  56 static bool
  57 is_dummy_class(const struct netdev_class *class)
  58 {
  59     return class->create == netdev_dummy_create;
  60 }
  61
  62 static struct netdev_dev_dummy *
  63 netdev_dev_dummy_cast(const struct netdev_dev *netdev_dev)
  64 {
  65     assert(is_dummy_class(netdev_dev_get_class(netdev_dev)));
  66     return CONTAINER_OF(netdev_dev, struct netdev_dev_dummy, netdev_dev);
  67 }
  68
  69 static struct netdev_dummy *
  70 netdev_dummy_cast(const struct netdev *netdev)
  71 {
  72     struct netdev_dev *netdev_dev = netdev_get_dev(netdev);
  73     assert(is_dummy_class(netdev_dev_get_class(netdev_dev)));
  74     return CONTAINER_OF(netdev, struct netdev_dummy, netdev);
  75 }
  76
  77 static int
  78 netdev_dummy_create(const struct netdev_class *class, const char *name,
  79                     const struct shash *args OVS_UNUSED,
  80                     struct netdev_dev **netdev_devp)
  81 {
  82     static unsigned int n = 0xaa550000;
  83     struct netdev_dev_dummy *netdev_dev;
  84
  85     netdev_dev = xzalloc(sizeof *netdev_dev);
  86     netdev_dev_init(&netdev_dev->netdev_dev, name, class);
  87     netdev_dev->hwaddr[0] = 0xaa;
  88     netdev_dev->hwaddr[1] = 0x55;
  89     netdev_dev->hwaddr[2] = n >> 24;
  90     netdev_dev->hwaddr[3] = n >> 16;
  91     netdev_dev->hwaddr[4] = n >> 8;
  92     netdev_dev->hwaddr[5] = n;
  93     netdev_dev->mtu = 1500;
  94     netdev_dev->flags = 0;
  95
  96     n++;
  97
  98     *netdev_devp = &netdev_dev->netdev_dev;
  99
 100     return 0;
 101 }
 102
 103 static void
 104 netdev_dummy_destroy(struct netdev_dev *netdev_dev_)
 105 {
 106     struct netdev_dev_dummy *netdev_dev = netdev_dev_dummy_cast(netdev_dev_);
 107
 108     free(netdev_dev);
 109 }
 110
 111 static int
 112 netdev_dummy_open(struct netdev_dev *netdev_dev_, int ethertype OVS_UNUSED,
 113                   struct netdev **netdevp)
 114 {
 115     struct netdev_dummy *netdev;
 116
 117     netdev = xmalloc(sizeof *netdev);
 118     netdev_init(&netdev->netdev, netdev_dev_);
 119
 120     *netdevp = &netdev->netdev;
 121     return 0;
 122 }
 123
 124 static void
 125 netdev_dummy_close(struct netdev *netdev_)
 126 {
 127     struct netdev_dummy *netdev = netdev_dummy_cast(netdev_);
 128     free(netdev);
 129 }
 130
 131 static int
 132 netdev_dummy_set_etheraddr(struct netdev *netdev,
 133                            const uint8_t mac[ETH_ADDR_LEN])
 134 {
 135     struct netdev_dev_dummy *dev =
 136         netdev_dev_dummy_cast(netdev_get_dev(netdev));
 137
 138     if (!eth_addr_equals(dev->hwaddr, mac)) {
 139         memcpy(dev->hwaddr, mac, ETH_ADDR_LEN);
 140         netdev_dummy_poll_notify(netdev);
 141     }
 142
 143     return 0;
 144 }
 145
 146 static int
 147 netdev_dummy_get_etheraddr(const struct netdev *netdev,
 148                            uint8_t mac[ETH_ADDR_LEN])
 149 {
 150     const struct netdev_dev_dummy *dev =
 151         netdev_dev_dummy_cast(netdev_get_dev(netdev));
 152
 153     memcpy(mac, dev->hwaddr, ETH_ADDR_LEN);
 154     return 0;
 155 }
 156
 157 static int
 158 netdev_dummy_get_mtu(const struct netdev *netdev, int *mtup)
 159 {
 160     const struct netdev_dev_dummy *dev =
 161         netdev_dev_dummy_cast(netdev_get_dev(netdev));
 162
 163     *mtup = dev->mtu;
 164     return 0;
 165 }
 166
 167 static int
 168 netdev_dummy_get_stats(const struct netdev *netdev, struct netdev_stats *stats)
 169 {
 170     const struct netdev_dev_dummy *dev =
 171         netdev_dev_dummy_cast(netdev_get_dev(netdev));
 172
 173     *stats = dev->stats;
 174     return 0;
 175 }
 176
 177 static int
 178 netdev_dummy_set_stats(struct netdev *netdev, const struct netdev_stats *stats)
 179 {
 180     struct netdev_dev_dummy *dev =
 181         netdev_dev_dummy_cast(netdev_get_dev(netdev));
 182
 183     dev->stats = *stats;
 184     return 0;
 185 }
 186
 187 static int
 188 netdev_dummy_update_flags(struct netdev *netdev,
 189                           enum netdev_flags off, enum netdev_flags on,
 190                           enum netdev_flags *old_flagsp)
 191 {
 192     struct netdev_dev_dummy *dev =
 193         netdev_dev_dummy_cast(netdev_get_dev(netdev));
 194
 195     if ((off | on) & ~(NETDEV_UP | NETDEV_PROMISC)) {
 196         return EINVAL;
 197     }
 198
 199     *old_flagsp = dev->flags;
 200     dev->flags |= on;
 201     dev->flags &= ~off;
 202     if (*old_flagsp != dev->flags) {
 203         netdev_dummy_poll_notify(netdev);
 204     }
 205     return 0;
 206 }
 207
 208 static int
 209 netdev_dummy_poll_add(struct netdev *netdev,
 210                       void (*cb)(struct netdev_notifier *), void *aux,
 211                       struct netdev_notifier **notifierp)
 212 {
 213     const char *name = netdev_get_name(netdev);
 214     struct netdev_dummy_notifier *notifier;
 215     struct list *list;
 216     struct shash_node *shash_node;
 217
 218     shash_node = shash_find_data(&netdev_dummy_notifiers, name);
 219     if (!shash_node) {
 220         list = xmalloc(sizeof *list);
 221         list_init(list);
 222         shash_node = shash_add(&netdev_dummy_notifiers, name, list);
 223     } else {
 224         list = shash_node->data;
 225     }
 226
 227     notifier = xmalloc(sizeof *notifier);
 228     netdev_notifier_init(&notifier->notifier, netdev, cb, aux);
 229     list_push_back(list, &notifier->list_node);
 230     notifier->shash_node = shash_node;
 231
 232     *notifierp = &notifier->notifier;
 233
 234     return 0;
 235 }
 236
 237 static void
 238 netdev_dummy_poll_remove(struct netdev_notifier *notifier_)
 239 {
 240     struct netdev_dummy_notifier *notifier =
 241         CONTAINER_OF(notifier_, struct netdev_dummy_notifier, notifier);
 242
 243     struct list *list;
 244
 245     list = list_remove(&notifier->list_node);
 246     if (list_is_empty(list)) {
 247         shash_delete(&netdev_dummy_notifiers, notifier->shash_node);
 248         free(list);
 249     }
 250
 251     free(notifier);
 252 }
 253 \f
 254 /* Helper functions. */
 255
 256 static void
 257 netdev_dummy_poll_notify(const struct netdev *netdev)
 258 {
 259     const char *name = netdev_get_name(netdev);
 260     struct list *list = shash_find_data(&netdev_dummy_notifiers, name);
 261
 262     if (list) {
 263         struct netdev_dummy_notifier *notifier;
 264
 265         LIST_FOR_EACH (notifier, list_node, list) {
 266             struct netdev_notifier *n = &notifier->notifier;
 267             n->cb(n);
 268         }
 269     }
 270 }
 271
 272 static const struct netdev_class dummy_class = {
 273     "dummy",
 274     NULL,                       /* init */
 275     NULL,                       /* run */
 276     NULL,                       /* wait */
 277
 278     netdev_dummy_create,
 279     netdev_dummy_destroy,
 280     NULL,
 281
 282     netdev_dummy_open,
 283     netdev_dummy_close,
 284
 285     NULL,                       /* enumerate */
 286
 287     NULL,                       /* recv */
 288     NULL,                       /* recv_wait */
 289     NULL,                       /* drain */
 290
 291     NULL,                       /* send */
 292     NULL,                       /* send_wait */
 293
 294     netdev_dummy_set_etheraddr,
 295     netdev_dummy_get_etheraddr,
 296     netdev_dummy_get_mtu,
 297     NULL,                       /* get_ifindex */
 298     NULL,                       /* get_carrier */
 299     netdev_dummy_get_stats,
 300     netdev_dummy_set_stats,
 301
 302     NULL,                       /* get_features */
 303     NULL,                       /* set_advertisements */
 304     NULL,                       /* get_vlan_vid */
 305
 306     NULL,                       /* set_policing */
 307     NULL,                       /* get_qos_types */
 308     NULL,                       /* get_qos_capabilities */
 309     NULL,                       /* get_qos */
 310     NULL,                       /* set_qos */
 311     NULL,                       /* get_queue */
 312     NULL,                       /* set_queue */
 313     NULL,                       /* delete_queue */
 314     NULL,                       /* get_queue_stats */
 315     NULL,                       /* dump_queues */
 316     NULL,                       /* dump_queue_stats */
 317
 318     NULL,                       /* get_in4 */
 319     NULL,                       /* set_in4 */
 320     NULL,                       /* get_in6 */
 321     NULL,                       /* add_router */
 322     NULL,                       /* get_next_hop */
 323     NULL,                       /* get_tnl_iface */
 324     NULL,                       /* arp_lookup */
 325
 326     netdev_dummy_update_flags,
 327
 328     netdev_dummy_poll_add,
 329     netdev_dummy_poll_remove,
 330 };
 331
 332 void
 333 netdev_dummy_register(void)
 334 {
 335     netdev_register_provider(&dummy_class);
 336 }