1 /* $NetBSD: in_var.h,v 1.11 1995/04/13 06:30:32 cgd Exp $ */ 2 3 /* 4 * Copyright (c) 1985, 1986, 1993 5 * The Regents of the University of California. 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 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the University of 18 * California, Berkeley and its contributors. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 * 35 * @(#)in_var.h 8.1 (Berkeley) 6/10/93 36 */ 37 38 /* 39 * Interface address, Internet version. One of these structures 40 * is allocated for each interface with an Internet address. 41 * The ifaddr structure contains the protocol-independent part 42 * of the structure and is assumed to be first. 43 */ 44 struct in_ifaddr { 45 struct ifaddr ia_ifa; /* protocol-independent info */ 46 #define ia_ifp ia_ifa.ifa_ifp 47 #define ia_flags ia_ifa.ifa_flags 48 /* ia_{,sub}net{,mask} in host order */ 49 u_int32_t ia_net; /* network number of interface */ 50 u_int32_t ia_netmask; /* mask of net part */ 51 u_int32_t ia_subnet; /* subnet number, including net */ 52 u_int32_t ia_subnetmask; /* mask of subnet part */ 53 struct in_addr ia_netbroadcast; /* to recognize net broadcasts */ 54 struct in_ifaddr *ia_next; /* next in list of internet addresses */ 55 struct sockaddr_in ia_addr; /* reserve space for interface name */ 56 struct sockaddr_in ia_dstaddr; /* reserve space for broadcast addr */ 57 #define ia_broadaddr ia_dstaddr 58 struct sockaddr_in ia_sockmask; /* reserve space for general netmask */ 59 struct in_multi *ia_multiaddrs; /* list of multicast addresses */ 60 }; 61 62 struct in_aliasreq { 63 char ifra_name[IFNAMSIZ]; /* if name, e.g. "en0" */ 64 struct sockaddr_in ifra_addr; 65 struct sockaddr_in ifra_broadaddr; 66 #define ifra_dstaddr ifra_broadaddr 67 struct sockaddr_in ifra_mask; 68 }; 69 /* 70 * Given a pointer to an in_ifaddr (ifaddr), 71 * return a pointer to the addr as a sockaddr_in. 72 */ 73 #define IA_SIN(ia) (&(((struct in_ifaddr *)(ia))->ia_addr)) 74 75 #define IN_LNAOF(in, ifa) \ 76 ((ntohl((in).s_addr) & ~((struct in_ifaddr *)(ifa)->ia_subnetmask)) 77 78 79 #ifdef _KERNEL 80 extern struct in_ifaddr *in_ifaddr; 81 extern struct ifqueue ipintrq; /* ip packet input queue */ 82 void in_socktrim __P((struct sockaddr_in *)); 83 84 85 /* 86 * Macro for finding the interface (ifnet structure) corresponding to one 87 * of our IP addresses. 88 */ 89 #define INADDR_TO_IFP(addr, ifp) \ 90 /* struct in_addr addr; */ \ 91 /* struct ifnet *ifp; */ \ 92 { \ 93 register struct in_ifaddr *ia; \ 94 \ 95 for (ia = in_ifaddr; \ 96 ia != NULL && IA_SIN(ia)->sin_addr.s_addr != (addr).s_addr; \ 97 ia = ia->ia_next) \ 98 continue; \ 99 (ifp) = (ia == NULL) ? NULL : ia->ia_ifp; \ 100 } 101 102 /* 103 * Macro for finding the internet address structure (in_ifaddr) corresponding 104 * to a given interface (ifnet structure). 105 */ 106 #define IFP_TO_IA(ifp, ia) \ 107 /* struct ifnet *ifp; */ \ 108 /* struct in_ifaddr *ia; */ \ 109 { \ 110 for ((ia) = in_ifaddr; \ 111 (ia) != NULL && (ia)->ia_ifp != (ifp); \ 112 (ia) = (ia)->ia_next) \ 113 continue; \ 114 } 115 #endif 116 117 /* 118 * Internet multicast address structure. There is one of these for each IP 119 * multicast group to which this host belongs on a given network interface. 120 * They are kept in a linked list, rooted in the interface's in_ifaddr 121 * structure. 122 */ 123 struct in_multi { 124 struct in_addr inm_addr; /* IP multicast address */ 125 struct ifnet *inm_ifp; /* back pointer to ifnet */ 126 struct in_ifaddr *inm_ia; /* back pointer to in_ifaddr */ 127 u_int inm_refcount; /* no. membership claims by sockets */ 128 u_int inm_timer; /* IGMP membership report timer */ 129 struct in_multi *inm_next; /* ptr to next multicast address */ 130 }; 131 132 #ifdef _KERNEL 133 /* 134 * Structure used by macros below to remember position when stepping through 135 * all of the in_multi records. 136 */ 137 struct in_multistep { 138 struct in_ifaddr *i_ia; 139 struct in_multi *i_inm; 140 }; 141 142 /* 143 * Macro for looking up the in_multi record for a given IP multicast address 144 * on a given interface. If no matching record is found, "inm" returns NULL. 145 */ 146 #define IN_LOOKUP_MULTI(addr, ifp, inm) \ 147 /* struct in_addr addr; */ \ 148 /* struct ifnet *ifp; */ \ 149 /* struct in_multi *inm; */ \ 150 { \ 151 register struct in_ifaddr *ia; \ 152 \ 153 IFP_TO_IA((ifp), ia); \ 154 if (ia == NULL) \ 155 (inm) = NULL; \ 156 else \ 157 for ((inm) = ia->ia_multiaddrs; \ 158 (inm) != NULL && (inm)->inm_addr.s_addr != (addr).s_addr; \ 159 (inm) = inm->inm_next) \ 160 continue; \ 161 } 162 163 /* 164 * Macro to step through all of the in_multi records, one at a time. 165 * The current position is remembered in "step", which the caller must 166 * provide. IN_FIRST_MULTI(), below, must be called to initialize "step" 167 * and get the first record. Both macros return a NULL "inm" when there 168 * are no remaining records. 169 */ 170 #define IN_NEXT_MULTI(step, inm) \ 171 /* struct in_multistep step; */ \ 172 /* struct in_multi *inm; */ \ 173 { \ 174 if (((inm) = (step).i_inm) != NULL) \ 175 (step).i_inm = (inm)->inm_next; \ 176 else \ 177 while ((step).i_ia != NULL) { \ 178 (inm) = (step).i_ia->ia_multiaddrs; \ 179 (step).i_ia = (step).i_ia->ia_next; \ 180 if ((inm) != NULL) { \ 181 (step).i_inm = (inm)->inm_next; \ 182 break; \ 183 } \ 184 } \ 185 } 186 187 #define IN_FIRST_MULTI(step, inm) \ 188 /* struct in_multistep step; */ \ 189 /* struct in_multi *inm; */ \ 190 { \ 191 (step).i_ia = in_ifaddr; \ 192 (step).i_inm = NULL; \ 193 IN_NEXT_MULTI((step), (inm)); \ 194 } 195 196 int in_ifinit __P((struct ifnet *, 197 struct in_ifaddr *, struct sockaddr_in *, int)); 198 struct in_multi *in_addmulti __P((struct in_addr *, struct ifnet *)); 199 int in_delmulti __P((struct in_multi *)); 200 void in_ifscrub __P((struct ifnet *, struct in_ifaddr *)); 201 int in_control __P((struct socket *, u_long, caddr_t, struct ifnet *)); 202 #endif 203