1 /* 2 * Copyright (c) 1985, 1986, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * %sccs.include.redist.c% 6 * 7 * @(#)in_var.h 8.2 (Berkeley) 01/09/95 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 #define IN_LNAOF(in, ifa) \ 48 ((ntohl((in).s_addr) & ~((struct in_ifaddr *)(ifa)->ia_subnetmask)) 49 50 51 #ifdef KERNEL 52 extern struct in_ifaddr *in_ifaddr; 53 extern struct ifqueue ipintrq; /* ip packet input queue */ 54 void in_socktrim __P((struct sockaddr_in *)); 55 56 57 /* 58 * Macro for finding the interface (ifnet structure) corresponding to one 59 * of our IP addresses. 60 */ 61 #define INADDR_TO_IFP(addr, ifp) \ 62 /* struct in_addr addr; */ \ 63 /* struct ifnet *ifp; */ \ 64 { \ 65 register struct in_ifaddr *ia; \ 66 \ 67 for (ia = in_ifaddr; \ 68 ia != NULL && IA_SIN(ia)->sin_addr.s_addr != (addr).s_addr; \ 69 ia = ia->ia_next) \ 70 continue; \ 71 (ifp) = (ia == NULL) ? NULL : ia->ia_ifp; \ 72 } 73 74 /* 75 * Macro for finding the internet address structure (in_ifaddr) corresponding 76 * to a given interface (ifnet structure). 77 */ 78 #define IFP_TO_IA(ifp, ia) \ 79 /* struct ifnet *ifp; */ \ 80 /* struct in_ifaddr *ia; */ \ 81 { \ 82 for ((ia) = in_ifaddr; \ 83 (ia) != NULL && (ia)->ia_ifp != (ifp); \ 84 (ia) = (ia)->ia_next) \ 85 continue; \ 86 } 87 #endif 88 89 /* 90 * Internet multicast address structure. There is one of these for each IP 91 * multicast group to which this host belongs on a given network interface. 92 * They are kept in a linked list, rooted in the interface's in_ifaddr 93 * structure. 94 */ 95 struct in_multi { 96 struct in_addr inm_addr; /* IP multicast address */ 97 struct ifnet *inm_ifp; /* back pointer to ifnet */ 98 struct in_ifaddr *inm_ia; /* back pointer to in_ifaddr */ 99 u_int inm_refcount; /* no. membership claims by sockets */ 100 u_int inm_timer; /* IGMP membership report timer */ 101 struct in_multi *inm_next; /* ptr to next multicast address */ 102 }; 103 104 #ifdef KERNEL 105 /* 106 * Structure used by macros below to remember position when stepping through 107 * all of the in_multi records. 108 */ 109 struct in_multistep { 110 struct in_ifaddr *i_ia; 111 struct in_multi *i_inm; 112 }; 113 114 /* 115 * Macro for looking up the in_multi record for a given IP multicast address 116 * on a given interface. If no matching record is found, "inm" returns NULL. 117 */ 118 #define IN_LOOKUP_MULTI(addr, ifp, inm) \ 119 /* struct in_addr addr; */ \ 120 /* struct ifnet *ifp; */ \ 121 /* struct in_multi *inm; */ \ 122 { \ 123 register struct in_ifaddr *ia; \ 124 \ 125 IFP_TO_IA((ifp), ia); \ 126 if (ia == NULL) \ 127 (inm) = NULL; \ 128 else \ 129 for ((inm) = ia->ia_multiaddrs; \ 130 (inm) != NULL && (inm)->inm_addr.s_addr != (addr).s_addr; \ 131 (inm) = inm->inm_next) \ 132 continue; \ 133 } 134 135 /* 136 * Macro to step through all of the in_multi records, one at a time. 137 * The current position is remembered in "step", which the caller must 138 * provide. IN_FIRST_MULTI(), below, must be called to initialize "step" 139 * and get the first record. Both macros return a NULL "inm" when there 140 * are no remaining records. 141 */ 142 #define IN_NEXT_MULTI(step, inm) \ 143 /* struct in_multistep step; */ \ 144 /* struct in_multi *inm; */ \ 145 { \ 146 if (((inm) = (step).i_inm) != NULL) \ 147 (step).i_inm = (inm)->inm_next; \ 148 else \ 149 while ((step).i_ia != NULL) { \ 150 (inm) = (step).i_ia->ia_multiaddrs; \ 151 (step).i_ia = (step).i_ia->ia_next; \ 152 if ((inm) != NULL) { \ 153 (step).i_inm = (inm)->inm_next; \ 154 break; \ 155 } \ 156 } \ 157 } 158 159 #define IN_FIRST_MULTI(step, inm) \ 160 /* struct in_multistep step; */ \ 161 /* struct in_multi *inm; */ \ 162 { \ 163 (step).i_ia = in_ifaddr; \ 164 (step).i_inm = NULL; \ 165 IN_NEXT_MULTI((step), (inm)); \ 166 } 167 168 int in_ifinit __P((struct ifnet *, 169 struct in_ifaddr *, struct sockaddr_in *, int)); 170 struct in_multi *in_addmulti __P((struct in_addr *, struct ifnet *)); 171 int in_delmulti __P((struct in_multi *)); 172 void in_ifscrub __P((struct ifnet *, struct in_ifaddr *)); 173 int in_control __P((struct socket *, u_long, caddr_t, struct ifnet *)); 174 #endif 175