sysdeps/unix/sysv/linux/netlinkaccess.h

   1 /* Copyright (C) 2004, 2005, 2006 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, write to the Free
  16    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  17    02111-1307 USA.  */
  18
  19 #ifndef _NETLINKACCESS_H
  20 #define _NETLINKACCESS_H 1
  21
  22 #include <asm/types.h>
  23 #include <linux/netlink.h>
  24 #include <linux/rtnetlink.h>
  25
  26 #include <kernel-features.h>
  27
  28 #ifndef IFA_MAX
  29 /* 2.6.19 kernel headers helpfully removed some macros and
  30    moved lots of stuff into new headers, some of which aren't
  31    included by linux/rtnetlink.h.  */
  32 #include <linux/if_addr.h>
  33 #endif
  34
  35 #ifndef IFA_RTA
  36 # define IFA_RTA(r) \
  37   ((struct rtattr*) ((char*)(r) + NLMSG_ALIGN (sizeof (struct ifaddrmsg))))
  38 # define IFA_PAYLOAD(n) NLMSG_PAYLOAD (n, sizeof (struct ifaddrmsg))
  39 #endif
  40
  41 #ifndef IFLA_RTA
  42 # define IFLA_RTA(r) \
  43   ((struct rtattr*) ((char*)(r) + NLMSG_ALIGN (sizeof (struct ifinfomsg))))
  44 # define IFLA_PAYLOAD(n) NLMSG_PAYLOAD (n, sizeof (struct ifinfomsg))
  45 #endif
  46
  47 struct netlink_res
  48 {
  49   struct netlink_res *next;
  50   struct nlmsghdr *nlh;
  51   size_t size;                  /* Size of response.  */
  52   uint32_t seq;                 /* sequential number we used.  */
  53 };
  54
  55
  56 struct netlink_handle
  57 {
  58   int fd;                       /* Netlink file descriptor.  */
  59   pid_t pid;                    /* Process ID.  */
  60   uint32_t seq;                 /* The sequence number we use currently.  */
  61   struct netlink_res *nlm_list; /* Pointer to list of responses.  */
  62   struct netlink_res *end_ptr;  /* For faster append of new entries.  */
  63 };
  64
  65
  66 #if __ASSUME_NETLINK_SUPPORT == 0
  67 extern int __no_netlink_support attribute_hidden;
  68 #else
  69 # define __no_netlink_support 0
  70 #endif
  71
  72
  73 extern int __netlink_open (struct netlink_handle *h);
  74 extern void __netlink_close (struct netlink_handle *h);
  75 extern void __netlink_free_handle (struct netlink_handle *h);
  76 extern int __netlink_request (struct netlink_handle *h, int type);
  77
  78
  79 #endif /* netlinkaccess.h */