in_var.h revision 21666
1/* 2 * Copyright (c) 1985, 1986, 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_var.h 8.2 (Berkeley) 1/9/95 34 * $Id: in_var.h,v 1.19 1996/12/15 20:46:39 wollman Exp $ 35 */ 36 37#ifndef _NETINET_IN_VAR_H_ 38#define _NETINET_IN_VAR_H_ 39 40#include <sys/queue.h> 41 42/* 43 * Interface address, Internet version. One of these structures 44 * is allocated for each Internet address on an interface. 45 * The ifaddr structure contains the protocol-independent part 46 * of the structure and is assumed to be first. 47 */ 48struct in_ifaddr { 49 struct ifaddr ia_ifa; /* protocol-independent info */ 50#define ia_ifp ia_ifa.ifa_ifp 51#define ia_flags ia_ifa.ifa_flags 52 /* ia_{,sub}net{,mask} in host order */ 53 u_long ia_net; /* network number of interface */ 54 u_long ia_netmask; /* mask of net part */ 55 u_long ia_subnet; /* subnet number, including net */ 56 u_long ia_subnetmask; /* mask of subnet part */ 57 struct in_addr ia_netbroadcast; /* to recognize net broadcasts */ 58 TAILQ_ENTRY(in_ifaddr) ia_link; /* tailq macro glue */ 59 struct sockaddr_in ia_addr; /* reserve space for interface name */ 60 struct sockaddr_in ia_dstaddr; /* reserve space for broadcast addr */ 61#define ia_broadaddr ia_dstaddr 62 struct sockaddr_in ia_sockmask; /* reserve space for general netmask */ 63}; 64 65struct in_aliasreq { 66 char ifra_name[IFNAMSIZ]; /* if name, e.g. "en0" */ 67 struct sockaddr_in ifra_addr; 68 struct sockaddr_in ifra_broadaddr; 69#define ifra_dstaddr ifra_broadaddr 70 struct sockaddr_in ifra_mask; 71}; 72/* 73 * Given a pointer to an in_ifaddr (ifaddr), 74 * return a pointer to the addr as a sockaddr_in. 75 */ 76#define IA_SIN(ia) (&(((struct in_ifaddr *)(ia))->ia_addr)) 77#define IA_DSTSIN(ia) (&(((struct in_ifaddr *)(ia))->ia_dstaddr)) 78 79#define IN_LNAOF(in, ifa) \ 80 ((ntohl((in).s_addr) & ~((struct in_ifaddr *)(ifa)->ia_subnetmask)) 81 82 83#ifdef KERNEL 84extern TAILQ_HEAD(in_ifaddrhead, in_ifaddr) in_ifaddrhead; 85extern struct ifqueue ipintrq; /* ip packet input queue */ 86extern struct in_addr zeroin_addr; 87extern u_char inetctlerrmap[]; 88extern int rtq_reallyold; /* XXX */ 89extern int rtq_minreallyold; /* XXX */ 90extern int rtq_toomany; /* XXX */ 91 92/* 93 * Macro for finding the interface (ifnet structure) corresponding to one 94 * of our IP addresses. 95 */ 96#define INADDR_TO_IFP(addr, ifp) \ 97 /* struct in_addr addr; */ \ 98 /* struct ifnet *ifp; */ \ 99{ \ 100 register struct in_ifaddr *ia; \ 101\ 102 for (ia = in_ifaddrhead.tqh_first; \ 103 ia != NULL && ((ia->ia_ifp->if_flags & IFF_POINTOPOINT)? \ 104 IA_DSTSIN(ia):IA_SIN(ia))->sin_addr.s_addr != (addr).s_addr; \ 105 ia = ia->ia_link.tqe_next) \ 106 continue; \ 107 if (ia == NULL) \ 108 for (ia = in_ifaddrhead.tqh_first; \ 109 ia != NULL; \ 110 ia = ia->ia_link.tqe_next) \ 111 if (ia->ia_ifp->if_flags & IFF_POINTOPOINT && \ 112 IA_SIN(ia)->sin_addr.s_addr == (addr).s_addr) \ 113 break; \ 114 (ifp) = (ia == NULL) ? NULL : ia->ia_ifp; \ 115} 116 117/* 118 * Macro for finding the internet address structure (in_ifaddr) corresponding 119 * to a given interface (ifnet structure). 120 */ 121#define IFP_TO_IA(ifp, ia) \ 122 /* struct ifnet *ifp; */ \ 123 /* struct in_ifaddr *ia; */ \ 124{ \ 125 for ((ia) = in_ifaddrhead.tqh_first; \ 126 (ia) != NULL && (ia)->ia_ifp != (ifp); \ 127 (ia) = (ia)->ia_link.tqe_next) \ 128 continue; \ 129} 130#endif 131 132/* 133 * This information should be part of the ifnet structure but we don't wish 134 * to change that - as it might break a number of things 135 */ 136 137struct router_info { 138 struct ifnet *rti_ifp; 139 int rti_type; /* type of router which is querier on this interface */ 140 int rti_time; /* # of slow timeouts since last old query */ 141 struct router_info *rti_next; 142}; 143 144/* 145 * Internet multicast address structure. There is one of these for each IP 146 * multicast group to which this host belongs on a given network interface. 147 * For every entry on the interface's if_multiaddrs list which represents 148 * an IP multicast group, there is one of these structures. They are also 149 * kept on a system-wide list to make it easier to keep our legacy IGMP code 150 * compatible with the rest of the world (see IN_FIRST_MULTI et al, below). 151 */ 152struct in_multi { 153 LIST_ENTRY(in_multi) inm_link; /* queue macro glue */ 154 struct in_addr inm_addr; /* IP multicast address, convenience */ 155 struct ifnet *inm_ifp; /* back pointer to ifnet */ 156 struct ifmultiaddr *inm_ifma; /* back pointer to ifmultiaddr */ 157 u_int inm_timer; /* IGMP membership report timer */ 158 u_int inm_state; /* state of the membership */ 159 struct router_info *inm_rti; /* router info*/ 160}; 161 162#ifdef KERNEL 163extern LIST_HEAD(in_multihead, in_multi) in_multihead; 164 165/* 166 * Structure used by macros below to remember position when stepping through 167 * all of the in_multi records. 168 */ 169struct in_multistep { 170 struct in_multi *i_inm; 171}; 172 173/* 174 * Macro for looking up the in_multi record for a given IP multicast address 175 * on a given interface. If no matching record is found, "inm" is set null. 176 */ 177#define IN_LOOKUP_MULTI(addr, ifp, inm) \ 178 /* struct in_addr addr; */ \ 179 /* struct ifnet *ifp; */ \ 180 /* struct in_multi *inm; */ \ 181do { \ 182 register struct ifmultiaddr *ifma; \ 183\ 184 for (ifma = (ifp)->if_multiaddrs.lh_first; ifma; \ 185 ifma = ifma->ifma_link.le_next) { \ 186 if (ifma->ifma_addr->sa_family == AF_INET \ 187 && ((struct sockaddr_in *)ifma)->sin_addr.s_addr == \ 188 (addr).s_addr) \ 189 break; \ 190 } \ 191 (inm) = ifma ? ifma->ifma_protospec : 0; \ 192} while(0) 193 194/* 195 * Macro to step through all of the in_multi records, one at a time. 196 * The current position is remembered in "step", which the caller must 197 * provide. IN_FIRST_MULTI(), below, must be called to initialize "step" 198 * and get the first record. Both macros return a NULL "inm" when there 199 * are no remaining records. 200 */ 201#define IN_NEXT_MULTI(step, inm) \ 202 /* struct in_multistep step; */ \ 203 /* struct in_multi *inm; */ \ 204do { \ 205 if (((inm) = (step).i_inm) != NULL) \ 206 (step).i_inm = (step).i_inm->inm_link.le_next; \ 207} while(0) 208 209#define IN_FIRST_MULTI(step, inm) \ 210 /* struct in_multistep step; */ \ 211 /* struct in_multi *inm; */ \ 212do { \ 213 (step).i_inm = in_multihead.lh_first; \ 214 IN_NEXT_MULTI((step), (inm)); \ 215} while(0) 216 217struct in_multi *in_addmulti __P((struct in_addr *, struct ifnet *)); 218void in_delmulti __P((struct in_multi *)); 219int in_control __P((struct socket *, u_long, caddr_t, struct ifnet *)); 220void in_rtqdrain __P((void)); 221void ip_input __P((struct mbuf *)); 222 223#endif /* KERNEL */ 224 225#endif /* _NETINET_IN_VAR_H_ */ 226