contrib/dhcpcd/src/ipv4ll.h

   1 /* SPDX-License-Identifier: BSD-2-Clause */
   2 /*
   3  * dhcpcd - DHCP client daemon
   4  * Copyright (c) 2006-2019 Roy Marples <roy@marples.name>
   5  * All rights reserved
   6
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  26  * SUCH DAMAGE.
  27  */
  28
  29 #ifndef IPV4LL_H
  30 #define IPV4LL_H
  31
  32 #define LINKLOCAL_ADDR          0xa9fe0000
  33 #define LINKLOCAL_MASK          IN_CLASSB_NET
  34 #define LINKLOCAL_BCAST         (LINKLOCAL_ADDR | ~LINKLOCAL_MASK)
  35
  36 #ifndef IN_LINKLOCAL
  37 # define IN_LINKLOCAL(addr) ((addr & IN_CLASSB_NET) == LINKLOCAL_ADDR)
  38 #endif
  39
  40 #ifdef IPV4LL
  41 #include "arp.h"
  42
  43 struct ipv4ll_state {
  44         struct in_addr pickedaddr;
  45         struct ipv4_addr *addr;
  46         struct arp_state *arp;
  47         char randomstate[128];
  48         bool seeded;
  49         bool down;
  50         size_t conflicts;
  51 };
  52
  53 #define IPV4LL_STATE(ifp)                                                      \
  54         ((struct ipv4ll_state *)(ifp)->if_data[IF_DATA_IPV4LL])
  55 #define IPV4LL_CSTATE(ifp)                                                     \
  56         ((const struct ipv4ll_state *)(ifp)->if_data[IF_DATA_IPV4LL])
  57 #define IPV4LL_STATE_RUNNING(ifp)                                              \
  58         (IPV4LL_CSTATE((ifp)) && !IPV4LL_CSTATE((ifp))->down &&                \
  59         (IPV4LL_CSTATE((ifp))->addr != NULL))
  60
  61 int ipv4ll_subnetroute(rb_tree_t *, struct interface *);
  62 int ipv4ll_defaultroute(rb_tree_t *,struct interface *);
  63 ssize_t ipv4ll_env(FILE *, const char *, const struct interface *);
  64 void ipv4ll_start(void *);
  65 void ipv4ll_claimed(void *);
  66 void ipv4ll_handle_failure(void *);
  67 void ipv4ll_handleifa(int, struct ipv4_addr *, pid_t pid);
  68 #ifdef HAVE_ROUTE_METRIC
  69 int ipv4ll_recvrt(int, const struct rt *);
  70 #endif
  71
  72 void ipv4ll_reset(struct interface *);
  73 void ipv4ll_drop(struct interface *);
  74 void ipv4ll_free(struct interface *);
  75 #endif
  76
  77 #endif