reactos/drivers/lib/oskittcp/oskittcp/in.c

   1 /*
   2  * Copyright (c) 1982, 1986, 1991, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  *
  33  *      @(#)in.c        8.2 (Berkeley) 11/15/93
  34  */
  35
  36 #include <sys/param.h>
  37 #include <sys/systm.h>
  38 #include <sys/ioctl.h>
  39 #include <sys/errno.h>
  40 #include <sys/malloc.h>
  41 #include <sys/socket.h>
  42 #include <sys/socketvar.h>
  43 #include <sys/queue.h>
  44
  45 #include <net/if.h>
  46 #include <net/route.h>
  47
  48 #include <netinet/in_systm.h>
  49 #include <netinet/in.h>
  50 #include <netinet/in_var.h>
  51 #include <netinet/if_ether.h>
  52
  53 #include <netinet/igmp_var.h>
  54
  55 /*
  56  * This structure is used to keep track of in_multi chains which belong to
  57  * deleted interface addresses.
  58  */
  59 static LIST_HEAD(in_mk_type, multi_kludge) in_mk; /* XXX BSS initialization */
  60
  61 struct multi_kludge {
  62         LIST_ENTRY(multi_kludge) mk_entry;
  63         struct ifnet *mk_ifp;
  64         struct in_multihead mk_head;
  65 };
  66
  67 #ifndef SUBNETSARELOCAL
  68 #define SUBNETSARELOCAL 1
  69 #endif
  70 int subnetsarelocal = SUBNETSARELOCAL;
  71 /*
  72  * Return 1 if an internet address is for a ``local'' host
  73  * (one to which we have a connection).  If subnetsarelocal
  74  * is true, this includes other subnets of the local net.
  75  * Otherwise, it includes only the directly-connected (sub)nets.
  76  */
  77 int
  78 in_localaddr(in)
  79         struct in_addr in;
  80 {
  81         register u_long i = ntohl(in.s_addr);
  82         register struct in_ifaddr *ia;
  83
  84         if (subnetsarelocal) {
  85                 for (ia = in_ifaddr; ia; ia = ia->ia_next)
  86                         if ((i & ia->ia_netmask) == ia->ia_net)
  87                                 return (1);
  88         } else {
  89                 for (ia = in_ifaddr; ia; ia = ia->ia_next)
  90                         if ((i & ia->ia_subnetmask) == ia->ia_subnet)
  91                                 return (1);
  92         }
  93         return (0);
  94 }
  95
  96 int     in_interfaces;          /* number of external internet interfaces */
  97
  98 /*
  99  * Generic internet control operations (ioctl's).
 100  * Ifp is 0 if not an interface-specific ioctl.
 101  */
 102 /* ARGSUSED */
 103 int
 104 in_control(so, cmd, data, ifp)
 105         struct socket *so;
 106         int cmd;
 107         caddr_t data;
 108         register struct ifnet *ifp;
 109 {
 110         return (0);
 111 }
 112
 113 /*
 114  * Delete a multicast address record.
 115  */
 116 void
 117 in_delmulti(inm)
 118         register struct in_multi *inm;
 119 {
 120 #if 0
 121         register struct in_multi **p;
 122         struct ifreq ifr;
 123         int s = splnet();
 124
 125         if (--inm->inm_refcount == 0) {
 126                 /*
 127                  * No remaining claims to this record; let IGMP know that
 128                  * we are leaving the multicast group.
 129                  */
 130             /* igmp_leavegroup(inm); XXX arty */
 131                 /*
 132                  * Unlink from list.
 133                  */
 134                 LIST_REMOVE(inm, inm_entry);
 135
 136                 /*
 137                  * Notify the network driver to update its multicast reception
 138                  * filter.
 139                  */
 140                 ((struct sockaddr_in *)&(ifr.ifr_addr))->sin_family = AF_INET;
 141                 ((struct sockaddr_in *)&(ifr.ifr_addr))->sin_addr =
 142                                                                 inm->inm_addr;
 143                 (*inm->inm_ifp->if_ioctl)(inm->inm_ifp, SIOCDELMULTI,
 144                                                              (caddr_t)&ifr);
 145                 free(inm, M_IPMADDR);
 146         }
 147         splx(s);
 148 #endif
 149 }