contrib/ipfilter/ipsend/in_var.h

   1 /*      @(#)in_var.h 1.3 88/08/19 SMI; from UCB 7.1 6/5/86      */
   2
   3 /*
   4  * Copyright (c) 1985, 1986 Regents of the University of California.
   5  * All rights reserved.  The Berkeley software License Agreement
   6  * specifies the terms and conditions for redistribution.
   7  */
   8
   9 /*
  10  * Interface address, Internet version.  One of these structures
  11  * is allocated for each interface with an Internet address.
  12  * The ifaddr structure contains the protocol-independent part
  13  * of the structure and is assumed to be first.
  14  */
  15
  16 #ifndef _netinet_in_var_h
  17 #define _netinet_in_var_h
  18
  19 struct in_ifaddr {
  20         struct  ifaddr ia_ifa;          /* protocol-independent info */
  21 #define ia_addr ia_ifa.ifa_addr
  22 #define ia_broadaddr    ia_ifa.ifa_broadaddr
  23 #define ia_dstaddr      ia_ifa.ifa_dstaddr
  24 #define ia_ifp          ia_ifa.ifa_ifp
  25         u_long  ia_net;                 /* network number of interface */
  26         u_long  ia_netmask;             /* mask of net part */
  27         u_long  ia_subnet;              /* subnet number, including net */
  28         u_long  ia_subnetmask;          /* mask of net + subnet */
  29         struct  in_addr ia_netbroadcast; /* broadcast addr for (logical) net */
  30         int     ia_flags;
  31         struct  in_ifaddr *ia_next;     /* next in list of internet addresses */
  32         struct  in_multi *ia_multiaddrs;/* list of multicast addresses */
  33 };
  34 /*
  35  * Given a pointer to an in_ifaddr (ifaddr),
  36  * return a pointer to the addr as a sockadd_in.
  37  */
  38 #define IA_SIN(ia) ((struct sockaddr_in *)(&((struct in_ifaddr *)ia)->ia_addr))
  39 /*
  40  * ia_flags
  41  */
  42 #define IFA_ROUTE       0x01            /* routing entry installed */
  43
  44 #ifdef  KERNEL
  45 struct  in_ifaddr *in_ifaddr;
  46 struct  in_ifaddr *in_iaonnetof();
  47 struct  ifqueue ipintrq;                /* ip packet input queue */
  48 #endif
  49
  50 #ifdef KERNEL
  51 /*
  52  * Macro for finding the interface (ifnet structure) corresponding to one
  53  * of our IP addresses.
  54  */
  55 #define INADDR_TO_IFP(addr, ifp)                                          \
  56         /* struct in_addr addr; */                                        \
  57         /* struct ifnet  *ifp;  */                                        \
  58 {                                                                         \
  59         register struct in_ifaddr *ia;                                    \
  60                                                                           \
  61         for (ia = in_ifaddr;                                              \
  62              ia != NULL && IA_SIN(ia)->sin_addr.s_addr != (addr).s_addr;  \
  63              ia = ia->ia_next);                                           \
  64         (ifp) = (ia == NULL) ? NULL : ia->ia_ifp;                         \
  65 }
  66
  67 /*
  68  * Macro for finding the internet address structure (in_ifaddr) corresponding
  69  * to a given interface (ifnet structure).
  70  */
  71 #define IFP_TO_IA(ifp, ia)                                                \
  72         /* struct ifnet     *ifp; */                                      \
  73         /* struct in_ifaddr *ia;  */                                      \
  74 {                                                                         \
  75         for ((ia) = in_ifaddr;                                            \
  76              (ia) != NULL && (ia)->ia_ifp != (ifp);                       \
  77              (ia) = (ia)->ia_next);                                       \
  78 }
  79 #endif KERNEL
  80
  81 /*
  82  * Per-interface router version information is kept in this list.
  83  * This information should be part of the ifnet structure but we don't wish
  84  * to change that - as it might break a number of things
  85  */
  86
  87 struct router_info {
  88         struct ifnet *ifp;
  89         int    type; /* type of router which is querier on this interface */
  90         int    time; /* # of slow timeouts since last old query */
  91         struct router_info *next;
  92 };
  93
  94 /*
  95  * Internet multicast address structure.  There is one of these for each IP
  96  * multicast group to which this host belongs on a given network interface.
  97  * They are kept in a linked list, rooted in the interface's in_ifaddr
  98  * structure.
  99  */
 100
 101 struct in_multi {
 102         struct in_addr     inm_addr;    /* IP multicast address             */
 103         struct ifnet      *inm_ifp;     /* back pointer to ifnet            */
 104         struct in_ifaddr  *inm_ia;      /* back pointer to in_ifaddr        */
 105         u_int              inm_refcount;/* no. membership claims by sockets */
 106         u_int              inm_timer;   /* IGMP membership report timer     */
 107         struct in_multi   *inm_next;    /* ptr to next multicast address    */
 108         u_int              inm_state;   /*  state of the membership */
 109         struct router_info *inm_rti;     /* router info*/
 110 };
 111
 112 #ifdef KERNEL
 113 /*
 114  * Structure used by macros below to remember position when stepping through
 115  * all of the in_multi records.
 116  */
 117 struct in_multistep {
 118         struct in_ifaddr *i_ia;
 119         struct in_multi  *i_inm;
 120 };
 121
 122 /*
 123  * Macro for looking up the in_multi record for a given IP multicast address
 124  * on a given interface.  If no matching record is found, "inm" returns NULL.
 125  */
 126 #define IN_LOOKUP_MULTI(addr, ifp, inm)                                     \
 127         /* struct in_addr  addr; */                                         \
 128         /* struct ifnet    *ifp; */                                         \
 129         /* struct in_multi *inm; */                                         \
 130 {                                                                           \
 131         register struct in_ifaddr *ia;                                      \
 132                                                                             \
 133         IFP_TO_IA((ifp), ia);                                               \
 134         if (ia == NULL)                                                     \
 135                 (inm) = NULL;                                               \
 136         else                                                                \
 137             for ((inm) = ia->ia_multiaddrs;                                 \
 138                  (inm) != NULL && (inm)->inm_addr.s_addr != (addr).s_addr;  \
 139                  (inm) = inm->inm_next);                                    \
 140 }
 141
 142 /*
 143  * Macro to step through all of the in_multi records, one at a time.
 144  * The current position is remembered in "step", which the caller must
 145  * provide.  IN_FIRST_MULTI(), below, must be called to initialize "step"
 146  * and get the first record.  Both macros return a NULL "inm" when there
 147  * are no remaining records.
 148  */
 149 #define IN_NEXT_MULTI(step, inm)                                        \
 150         /* struct in_multistep  step; */                                \
 151         /* struct in_multi     *inm;  */                                \
 152 {                                                                       \
 153         if (((inm) = (step).i_inm) != NULL) {                           \
 154                 (step).i_inm = (inm)->inm_next;                         \
 155         }                                                               \
 156         else while ((step).i_ia != NULL) {                              \
 157                 (inm) = (step).i_ia->ia_multiaddrs;                     \
 158                 (step).i_ia = (step).i_ia->ia_next;                     \
 159                 if ((inm) != NULL) {                                    \
 160                         (step).i_inm = (inm)->inm_next;                 \
 161                         break;                                          \
 162                 }                                                       \
 163         }                                                               \
 164 }
 165
 166 #define IN_FIRST_MULTI(step, inm)                                       \
 167         /* struct in_multistep  step; */                                \
 168         /* struct in_multi     *inm;  */                                \
 169 {                                                                       \
 170         (step).i_ia  = in_ifaddr;                                       \
 171         (step).i_inm = NULL;                                            \
 172         IN_NEXT_MULTI((step), (inm));                                   \
 173 }
 174
 175 struct in_multi *in_addmulti();
 176 #endif KERNEL
 177 #endif /*!_netinet_in_var_h*/