lib/netlink-notifier.h

   1 /*
   2  * Copyright (c) 2009 Nicira, Inc.
   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 NETLINK_NOTIFIER_H
  18 #define NETLINK_NOTIFIER_H 1
  19
  20 /* These functions are Linux specific, so they should be used directly only by
  21  * Linux-specific code. */
  22
  23 #include "openvswitch/list.h"
  24
  25 struct nln;
  26 struct nln_notifier;
  27
  28 struct nlattr;
  29 struct ofpbuf;
  30
  31 /* Function called to report netlink notifications.  'change' describes the
  32  * specific change filled out by an nln_parse_func.  It may be null if the
  33  * buffer of change information overflowed, in which case the function must
  34  * assume that everything may have changed. 'aux' is as specified in
  35  * nln_notifier_register(). */
  36 typedef void nln_notify_func(const void *change, void *aux);
  37
  38 /* Function called to parse incoming nln notifications.  The 'buf' message
  39  * should be parsed into 'change' as specified in nln_create().
  40  * Returns the multicast_group the change belongs to, or 0 for a parse error.
  41  */
  42 typedef int nln_parse_func(struct ofpbuf *buf, void *change);
  43
  44 struct nln *nln_create(int protocol, nln_parse_func *, void *change);
  45 void nln_destroy(struct nln *);
  46 struct nln_notifier *nln_notifier_create(struct nln *, int multicast_group,
  47                                          nln_notify_func *, void *aux);
  48 void nln_notifier_destroy(struct nln_notifier *);
  49 void nln_run(struct nln *);
  50 void nln_wait(struct nln *);
  51 void nln_report(const struct nln *nln, void *change, int group);
  52 #endif /* netlink-notifier.h */