external/bsd/dhcpcd/dist/ipv4ll.h

   1 /* $NetBSD: ipv4ll.h,v 1.10 2015/08/21 10:39:00 roy Exp $ */
   2
   3 /*
   4  * dhcpcd - DHCP client daemon
   5  * Copyright (c) 2006-2015 Roy Marples <roy@marples.name>
   6  * All rights reserved
   7
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  */
  29
  30 #ifndef IPV4LL_H
  31 #define IPV4LL_H
  32
  33 #include "arp.h"
  34
  35 extern const struct in_addr inaddr_llmask;
  36 extern const struct in_addr inaddr_llbcast;
  37
  38 #define LINKLOCAL_ADDR  0xa9fe0000
  39 #define LINKLOCAL_MASK  IN_CLASSB_NET
  40 #define LINKLOCAL_BRDC  (LINKLOCAL_ADDR | ~LINKLOCAL_MASK)
  41
  42 #ifndef IN_LINKLOCAL
  43 # define IN_LINKLOCAL(addr) ((addr & IN_CLASSB_NET) == LINKLOCAL_ADDR)
  44 #endif
  45
  46 struct ipv4ll_state {
  47         struct in_addr addr;
  48         struct arp_state *arp;
  49         unsigned int conflicts;
  50         struct timespec defend;
  51         char randomstate[128];
  52         uint8_t down;
  53 };
  54
  55 #define IPV4LL_STATE(ifp)                                                      \
  56         ((struct ipv4ll_state *)(ifp)->if_data[IF_DATA_IPV4LL])
  57 #define IPV4LL_CSTATE(ifp)                                                     \
  58         ((const struct ipv4ll_state *)(ifp)->if_data[IF_DATA_IPV4LL])
  59 #define IPV4LL_STATE_RUNNING(ifp)                                              \
  60         (IPV4LL_CSTATE((ifp)) && !IPV4LL_CSTATE((ifp))->down &&        \
  61         IN_LINKLOCAL(ntohl(IPV4LL_CSTATE((ifp))->addr.s_addr)))
  62
  63 struct rt* ipv4ll_subnet_route(const struct interface *);
  64 struct rt* ipv4ll_default_route(const struct interface *);
  65 ssize_t ipv4ll_env(char **, const char *, const struct interface *);
  66 void ipv4ll_start(void *);
  67 void ipv4ll_claimed(void *);
  68 void ipv4ll_handle_failure(void *);
  69
  70 #define ipv4ll_free(ifp) ipv4ll_freedrop((ifp), 0);
  71 #define ipv4ll_drop(ifp) ipv4ll_freedrop((ifp), 1);
  72 void ipv4ll_freedrop(struct interface *, int);
  73
  74 #endif