external/bsd/dhcpcd/dist/ipv4.h

   1 /* $NetBSD: ipv4.h,v 1.13 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 IPV4_H
  31 #define IPV4_H
  32
  33 #include "dhcpcd.h"
  34
  35 #ifdef IN_IFF_TENTATIVE
  36 #define IN_IFF_NOTUSEABLE \
  37         (IN_IFF_TENTATIVE | IN_IFF_DUPLICATED | IN_IFF_DETACHED)
  38 #endif
  39
  40 /* Prefer our macro */
  41 #ifdef HTONL
  42 #undef HTONL
  43 #endif
  44
  45 #if BYTE_ORDER == BIG_ENDIAN
  46 #define HTONL(A) (A)
  47 #elif BYTE_ORDER == LITTLE_ENDIAN
  48 #define HTONL(A) \
  49     ((((uint32_t)(A) & 0xff000000) >> 24) | \
  50     (((uint32_t)(A) & 0x00ff0000) >> 8) | \
  51     (((uint32_t)(A) & 0x0000ff00) << 8) | \
  52     (((uint32_t)(A) & 0x000000ff) << 24))
  53 #else
  54 #error Endian unknown
  55 #endif /* BYTE_ORDER */
  56
  57 struct rt {
  58         TAILQ_ENTRY(rt) next;
  59         struct in_addr dest;
  60         struct in_addr net;
  61         struct in_addr gate;
  62         const struct interface *iface;
  63 #ifdef HAVE_ROUTE_METRIC
  64         unsigned int metric;
  65 #endif
  66         unsigned int mtu;
  67         struct in_addr src;
  68         unsigned int flags;
  69         unsigned int state;
  70 };
  71 TAILQ_HEAD(rt_head, rt);
  72
  73 struct ipv4_addr {
  74         TAILQ_ENTRY(ipv4_addr) next;
  75         struct in_addr addr;
  76         struct in_addr net;
  77         struct in_addr dst;
  78         struct interface *iface;
  79         int addr_flags;
  80 };
  81 TAILQ_HEAD(ipv4_addrhead, ipv4_addr);
  82
  83 struct ipv4_state {
  84         struct ipv4_addrhead addrs;
  85         struct rt_head routes;
  86
  87 #ifdef BSD
  88         /* Buffer for BPF */
  89         size_t buffer_size, buffer_len, buffer_pos;
  90         unsigned char *buffer;
  91 #endif
  92 };
  93
  94 #define IPV4_STATE(ifp)                                                        \
  95         ((struct ipv4_state *)(ifp)->if_data[IF_DATA_IPV4])
  96 #define IPV4_CSTATE(ifp)                                                       \
  97         ((const struct ipv4_state *)(ifp)->if_data[IF_DATA_IPV4])
  98
  99 #ifdef INET
 100 struct ipv4_state *ipv4_getstate(struct interface *);
 101 int ipv4_init(struct dhcpcd_ctx *);
 102 int ipv4_protocol_fd(const struct interface *, uint16_t);
 103 int ipv4_ifcmp(const struct interface *, const struct interface *);
 104 uint8_t inet_ntocidr(struct in_addr);
 105 int inet_cidrtoaddr(int, struct in_addr *);
 106 uint32_t ipv4_getnetmask(uint32_t);
 107 int ipv4_hasaddr(const struct interface *);
 108
 109 #define STATE_ADDED             0x01
 110 #define STATE_FAKE              0x02
 111
 112 void ipv4_buildroutes(struct dhcpcd_ctx *);
 113 int ipv4_deladdr(struct interface *, const struct in_addr *,
 114     const struct in_addr *, int);
 115 int ipv4_preferanother(struct interface *);
 116 struct ipv4_addr *ipv4_addaddr(struct interface *,
 117     const struct in_addr *, const struct in_addr *, const struct in_addr *);
 118 void ipv4_applyaddr(void *);
 119 int ipv4_handlert(struct dhcpcd_ctx *, int, struct rt *);
 120 void ipv4_freerts(struct rt_head *);
 121
 122 struct ipv4_addr *ipv4_iffindaddr(struct interface *,
 123     const struct in_addr *, const struct in_addr *);
 124 struct ipv4_addr *ipv4_iffindlladdr(struct interface *);
 125 struct ipv4_addr *ipv4_findaddr(struct dhcpcd_ctx *, const struct in_addr *);
 126 void ipv4_handleifa(struct dhcpcd_ctx *, int, struct if_head *, const char *,
 127     const struct in_addr *, const struct in_addr *, const struct in_addr *,
 128     int);
 129
 130 void ipv4_freeroutes(struct rt_head *);
 131
 132 void ipv4_free(struct interface *);
 133 void ipv4_ctxfree(struct dhcpcd_ctx *);
 134 #else
 135 #define ipv4_init(a) (-1)
 136 #define ipv4_sortinterfaces(a) {}
 137 #define ipv4_applyaddr(a) {}
 138 #define ipv4_freeroutes(a) {}
 139 #define ipv4_free(a) {}
 140 #define ipv4_ctxfree(a) {}
 141 #define ipv4_hasaddr(a) (0)
 142 #define ipv4_preferanother(a) (0)
 143 #endif
 144
 145 #endif