lib/rtbsd.h

   1 /*
   2  * Copyright (c) 2011 Gaetano Catalli.
   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 #ifndef RTBSD_H
  18 #define RTBSD_H 1
  19
  20 #include "list.h"
  21
  22 /*
  23  * A digested version of a message received from a PF_ROUTE socket which
  24  * indicates that a network device has been created or destroyed or changed.
  25  */
  26 struct rtbsd_change {
  27     /* Copied from struct if_msghdr. */
  28     int msg_type;             /* e.g. XXX. */
  29
  30     /* Copied from struct if_msghdr. */
  31     int if_index;              /* Index of network device. */
  32
  33     char if_name[IF_NAMESIZE];         /* Name of network device. */
  34     int master_ifindex;         /* Ifindex of datapath master (0 if none). */
  35 };
  36
  37 /*
  38  * Function called to report that a netdev has changed.  'change' describes the
  39  * specific change.  It may be null if the buffer of change information
  40  * overflowed, in which case the function must assume that every device may
  41  * have changed.  'aux' is as specified in the call to
  42  * rtbsd_notifier_register().
  43  */
  44 typedef void rtbsd_notify_func(const struct rtbsd_change *, void *aux);
  45
  46 struct rtbsd_notifier {
  47     struct list node;
  48     rtbsd_notify_func *cb;
  49     void *aux;
  50 };
  51
  52 int rtbsd_notifier_register(struct rtbsd_notifier *,
  53                                 rtbsd_notify_func *, void *aux);
  54 void rtbsd_notifier_unregister(struct rtbsd_notifier *);
  55 void rtbsd_notifier_run(void);
  56 void rtbsd_notifier_wait(void);
  57
  58 #endif /* rtbsd.h */