lib/rtnetlink-link.h

   1 /*
   2  * Copyright (c) 2009 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 #ifndef RTNETLINK_LINK_H
  18 #define RTNETLINK_LINK_H 1
  19
  20 #include <stdbool.h>
  21
  22 struct ofpbuf;
  23 struct nln_notifier;
  24
  25 /* These functions are Linux specific, so they should be used directly only by
  26  * Linux-specific code. */
  27
  28 /* A digested version of an rtnetlink_link message sent down by the kernel to
  29  * indicate that a network device has been created, destroyed or changed.  */
  30 struct rtnetlink_link_change {
  31     /* Copied from struct nlmsghdr. */
  32     int nlmsg_type;             /* e.g. RTM_NEWLINK, RTM_DELLINK. */
  33
  34     /* Copied from struct ifinfomsg. */
  35     int ifi_index;              /* Index of network device. */
  36
  37     /* Extracted from Netlink attributes. */
  38     const char *ifname;         /* Name of network device. */
  39     int master_ifindex;         /* Ifindex of datapath master (0 if none). */
  40     unsigned int ifi_flags;     /* Flags of network device. */
  41 };
  42
  43 /* Function called to report that a netdev has changed.  'change' describes the
  44  * specific change.  It may be null if the buffer of change information
  45  * overflowed, in which case the function must assume that every device may
  46  * have changed.  'aux' is as specified in the call to
  47  * rtnetlink_link_notifier_register().  */
  48 typedef
  49 void rtnetlink_link_notify_func(const struct rtnetlink_link_change *change,
  50                                 void *aux);
  51
  52 bool rtnetlink_link_parse(struct ofpbuf *buf,
  53                           struct rtnetlink_link_change *change);
  54 struct nln_notifier *
  55 rtnetlink_link_notifier_create(rtnetlink_link_notify_func *, void *aux);
  56 void rtnetlink_link_notifier_destroy(struct nln_notifier *);
  57 void rtnetlink_link_run(void);
  58 void rtnetlink_link_wait(void);
  59 #endif /* rtnetlink-link.h */