1 /* 2 * Copyright (c) 1985, 1986 Regents of the University of California. 3 * All rights reserved. 4 * 5 * %sccs.include.redist.c% 6 * 7 * @(#)in_var.h 7.7 (Berkeley) 07/06/92 8 */ 9 10 /* 11 * Interface address, Internet version. One of these structures 12 * is allocated for each interface with an Internet address. 13 * The ifaddr structure contains the protocol-independent part 14 * of the structure and is assumed to be first. 15 */ 16 struct in_ifaddr { 17 struct ifaddr ia_ifa; /* protocol-independent info */ 18 #define ia_ifp ia_ifa.ifa_ifp 19 #define ia_flags ia_ifa.ifa_flags 20 /* ia_{,sub}net{,mask} in host order */ 21 u_long ia_net; /* network number of interface */ 22 u_long ia_netmask; /* mask of net part */ 23 u_long ia_subnet; /* subnet number, including net */ 24 u_long ia_subnetmask; /* mask of subnet part */ 25 struct in_addr ia_netbroadcast; /* to recognize net broadcasts */ 26 struct in_ifaddr *ia_next; /* next in list of internet addresses */ 27 struct sockaddr_in ia_addr; /* reserve space for interface name */ 28 struct sockaddr_in ia_dstaddr; /* reserve space for broadcast addr */ 29 #define ia_broadaddr ia_dstaddr 30 struct sockaddr_in ia_sockmask; /* reserve space for general netmask */ 31 struct in_multi *ia_multiaddrs; /* list of multicast addresses */ 32 }; 33 34 struct in_aliasreq { 35 char ifra_name[IFNAMSIZ]; /* if name, e.g. "en0" */ 36 struct sockaddr_in ifra_addr; 37 struct sockaddr_in ifra_broadaddr; 38 #define ifra_dstaddr ifra_broadaddr 39 struct sockaddr_in ifra_mask; 40 }; 41 /* 42 * Given a pointer to an in_ifaddr (ifaddr), 43 * return a pointer to the addr as a sockaddr_in. 44 */ 45 #define IA_SIN(ia) (&(((struct in_ifaddr *)(ia))->ia_addr)) 46 47 #ifdef KERNEL 48 struct in_ifaddr *in_ifaddr; 49 struct in_ifaddr *in_iaonnetof(); 50 struct ifqueue ipintrq; /* ip packet input queue */ 51 #endif 52 53 #ifdef KERNEL 54 /* 55 * Macro for finding the interface (ifnet structure) corresponding to one 56 * of our IP addresses. 57 */ 58 #define INADDR_TO_IFP(addr, ifp) \ 59 /* struct in_addr addr; */ \ 60 /* struct ifnet *ifp; */ \ 61 { \ 62 register struct in_ifaddr *ia; \ 63 \ 64 for (ia = in_ifaddr; \ 65 ia != NULL && IA_SIN(ia)->sin_addr.s_addr != (addr).s_addr; \ 66 ia = ia->ia_next) \ 67 continue; \ 68 (ifp) = (ia == NULL) ? NULL : ia->ia_ifp; \ 69 } 70 71 /* 72 * Macro for finding the internet address structure (in_ifaddr) corresponding 73 * to a given interface (ifnet structure). 74 */ 75 #define IFP_TO_IA(ifp, ia) \ 76 /* struct ifnet *ifp; */ \ 77 /* struct in_ifaddr *ia; */ \ 78 { \ 79 for ((ia) = in_ifaddr; \ 80 (ia) != NULL && (ia)->ia_ifp != (ifp); \ 81 (ia) = (ia)->ia_next) \ 82 continue; \ 83 } 84 #endif 85 86 /* 87 * Internet multicast address structure. There is one of these for each IP 88 * multicast group to which this host belongs on a given network interface. 89 * They are kept in a linked list, rooted in the interface's in_ifaddr 90 * structure. 91 */ 92 struct in_multi { 93 struct in_addr inm_addr; /* IP multicast address */ 94 struct ifnet *inm_ifp; /* back pointer to ifnet */ 95 struct in_ifaddr *inm_ia; /* back pointer to in_ifaddr */ 96 u_int inm_refcount; /* no. membership claims by sockets */ 97 u_int inm_timer; /* IGMP membership report timer */ 98 struct in_multi *inm_next; /* ptr to next multicast address */ 99 }; 100 101 #ifdef KERNEL 102 /* 103 * Structure used by macros below to remember position when stepping through 104 * all of the in_multi records. 105 */ 106 struct in_multistep { 107 struct in_ifaddr *i_ia; 108 struct in_multi *i_inm; 109 }; 110 111 /* 112 * Macro for looking up the in_multi record for a given IP multicast address 113 * on a given interface. If no matching record is found, "inm" returns NULL. 114 */ 115 #define IN_LOOKUP_MULTI(addr, ifp, inm) \ 116 /* struct in_addr addr; */ \ 117 /* struct ifnet *ifp; */ \ 118 /* struct in_multi *inm; */ \ 119 { \ 120 register struct in_ifaddr *ia; \ 121 \ 122 IFP_TO_IA((ifp), ia); \ 123 if (ia == NULL) \ 124 (inm) = NULL; \ 125 else \ 126 for ((inm) = ia->ia_multiaddrs; \ 127 (inm) != NULL && (inm)->inm_addr.s_addr != (addr).s_addr; \ 128 (inm) = inm->inm_next) \ 129 continue; \ 130 } 131 132 /* 133 * Macro to step through all of the in_multi records, one at a time. 134 * The current position is remembered in "step", which the caller must 135 * provide. IN_FIRST_MULTI(), below, must be called to initialize "step" 136 * and get the first record. Both macros return a NULL "inm" when there 137 * are no remaining records. 138 */ 139 #define IN_NEXT_MULTI(step, inm) \ 140 /* struct in_multistep step; */ \ 141 /* struct in_multi *inm; */ \ 142 { \ 143 if (((inm) = (step).i_inm) != NULL) \ 144 (step).i_inm = (inm)->inm_next; \ 145 else \ 146 while ((step).i_ia != NULL) { \ 147 (inm) = (step).i_ia->ia_multiaddrs; \ 148 (step).i_ia = (step).i_ia->ia_next; \ 149 if ((inm) != NULL) { \ 150 (step).i_inm = (inm)->inm_next; \ 151 break; \ 152 } \ 153 } \ 154 } 155 156 #define IN_FIRST_MULTI(step, inm) \ 157 /* struct in_multistep step; */ \ 158 /* struct in_multi *inm; */ \ 159 { \ 160 (step).i_ia = in_ifaddr; \ 161 (step).i_inm = NULL; \ 162 IN_NEXT_MULTI((step), (inm)); \ 163 } 164 165 struct in_multi *in_addmulti __P((struct in_addr *, struct ifnet *)); 166 int in_delmulti __P((struct in_multi *)); 167 #endif 168